CN1729416A - Optical device - Google Patents

In addition, because the refractive index of optical fiber 202 is different with the refractive index of resin 208, and the refractive index of the substrate 210 of filter part 206 is different with the refractive index of resin 208, so reflected light 226,228 and 230 betides the second contact surface 224 of 208 of the

222, slit 204 of 208 of the substrate 210 of first interface 220, filter part 206 of 208 of slit 204 and resins and resins and resins.

The

10A of first embodiment, as shown in Figures 1 and 2, have:

12, the

16 that constitutes by many

15 that are fixed in a plurality of V-

14 set on this

12, extend to slit set the

12 18 (with reference to Fig. 2) from the upper surface of each

15, be inserted into the light splitting part (filter part) 20 (with reference to Fig. 2) in this

18, arranging the

22 that is used for detecting by 15 transmission of each optical fiber, at least by PD (photodiode)

28 of a plurality of

26 of the light (reflected light) of

20 grades reflections, be used to that

28 is installed and make it towards the fixing

30 of

16 and be used for stably the fixedly

32 of

28 at least.In addition, the surface of two of

18 end faces and filter

20 and work that spectrum part 33 (with reference to Fig. 2) played at the back side are in order to separate the part by the

22 of

15 transmission.And as shown in Figure 3,

15 has

40 and covering 42.

Promptly, the

10A of this first embodiment has the

12 that is formed with V-

14, be fixed in the V-

14 of

12 and on each

15, be provided with the

16 of beam split function (

18,

20 etc.),

28 on the light path of the

24 that is fixed in the surrounding layer of each

15 by

52, produces because of the beam split function at least and the

30 that is used to install this

28, and this

30 is arranged to make the installed surface of

28 towards

12.

In addition, at this, owing to represent to constitute the example of

16 with many root

15, thereby " each

15 " refers to " four optical fiber in every ".But, owing to also can constitute

16 by an

15, so at this moment, " each optical fiber " or " multifiber " be read like " optical fiber " also.

Consider the suffered load of each

15 of

16 when processing slit 18 subsequently, the angle that is formed at the V-

14 on the

12 is more preferably greater than equaling 45 °; Otherwise, for making the uncovered fiber array, being the bonding agent (=bonding strength) of guaranteeing to provide capacity, this angle is preferably smaller or equal to 95 °.In this first embodiment, angle is 70 °.

The process that

16 is fixed on the

12 is: at first,

16 is positioned in the V-

14, and under this state, smear UV cured type bonding agent, then from the back side of

16 and the top irradiation ultraviolet radiation so that above-mentioned bonding agent harden fully.

The tilt angle alpha of slit 18 (with reference to Fig. 2), promptly with vertical angulation, preferably 15 °-25 °.If tilt angle alpha is too small, then scatter from the

24 of

20 excessive, the deterioration of under the situation that is used for multichannel (multichannel), can cause crosstalking (crosstalk).On the other hand, if the angle of inclination is excessive, then the polarization dependence (polarization dependency) from the

24 of

20 increases, and trends towards the reduction of characteristic.

As shown in Figure 3,

20 has

54, is formed at the

56 on the interarea of this quartz substrate 54.Consider the situation of the operation etc. of this

20, though the material of

20 can be plastic material, macromolecular material, polyimide material, but because the tilt angle alpha of

18 is greatly to 15 °-25 °, so in order to suppress the optical axis deviation owing to transmission one side that produces of refraction, the material of

20 is preferably made by having identical refractive index materials with optical fiber 15 (quartz).

In addition, be filled with ultraviolet hardening resin (bonding agent) 19 in the gap of 20 of this

18 in

18 and filter parts.It is resin that this

19 uses silicon, makes the refractive index cardinal principle of

54 of the refractive index of its refractive index and the

40 of

15 and

20 identical.

As shown in Figure 2, the structure of

28 adopts back surface incident type.The pastel of anisotropic

58 rather than Au solder flux and electrode or silver is arranged at the top of active layer 26 (

30 1 sides).From the viewpoint of crosstalking, this part is anisotropic

58 and the low material of air isoreflectance preferably, rather than the high material of Au isoreflectance.Certainly, also can use surperficial incident type PD array as

28.

The diameter of the light receiving part of back surface incident type PD array 28 (active layer 26) is about 60 μ m.The diameter of light receiving part (active layer 26) is preferably 40-80 μ m.This is because if diameter is then too small owing to light receiving part (active layer 26) less than 40 μ m, thereby the PD light receiving efficiency is descended.During more than or equal to 80 μ m, then

28 is easy to obtain parasitic light (stray light), crosstalks thereby can increase.

In addition, the installation constitution of

30 has adopted the such structure of optical fiber 15-PD array 28-auxiliary fixing member 30.Though also can adopt the structure of optical fiber 15-auxiliary fixing member 30-

28, but, at this moment be present between

15 and the

28 owing to

30, so the light path of

24 is elongated, then the distribution of

24 becomes big, and this is disadvantageous from PD light receiving efficiency and the viewpoint of crosstalking.In addition, the constituent material of

30 is Al ₂O ₃

Back surface incident

28 disposes positive electrode and negative electrode on its

26 1 sides (auxiliary fixing

30 1 sides), and forms the pattern of the positive electrode of shared negative electrode and each channel at auxiliary fixing

30 patrixes with Au electrode pattern 60.Be provided with the prominent point (bump) 62 of Au corresponding to the positive electrode of each channel and the part of negative electrode, and on the part of

26, be filled with anisotropic conductive pastel 58.Adopt the purpose of the prominent point of

62 this structures to realize the reliable conducting,, also can be used for reducing by reflection in this part and the caused parasitic light of scattering by increasing the interelectrode distance of

26 and

30 except that being used to.Anisotropic

58 makes the conductive materials such as silver that have in this anisotropic

58 be gathered into the concentrated place of prominent 62 such conductive material of Au by heating thereby have.Like this, only between itself and

60, has electric conductivity.

In addition, in order to suppress, in the lower surface of auxiliary fixing

30, be coated with not shown SiN on the part corresponding with

26 by the caused reflection of refringence.

And, on the installed surface of auxiliary fixing

30, the

32 in the gap that is used for determining 28 of

16 and PD arrays with UV cured type adhesive securement for example.

And, as shown in Figure 3, in the

10A of this first embodiment, the face of

56 1 sides of

20 is defined as

70, and the face of

54 1 sides of

20 is defined as

72, to be defined as first

74 towards the face of the

70 of

20 in the inner wall surface of

18, and will be defined as second

76 towards the face of the

72 of

20 time, first

74 of

18, one or more the

70 with

20 in the

72 of second

76 and filter

20 are not parallel.At this, " not parallel " refers to and form the folded angle of these uneven two faces is more than or equal to 0.5 °.

Particularly, in this first embodiment, vertical of the optical axis place of the

70 of

20 and

22 intersected formed line segment be defined as

80, the

72 of

20 is defined as

82 with above-mentioned vertical crossing formed line segment, first

74 of

18 is defined as the

84 with above-mentioned vertical crossing formed line segment, second

76 of

18 is intersected formed line segment when being defined as the

86 with above-mentioned vertical, then

80 and

82 are not parallel mutually, the

84 and the

86 are not parallel mutually, and

80 and the

84 are not parallel mutually.In addition, the magnitude relationship of the angle of inclination of the tilt angle alpha of

18 and first line segment 80 (with the plumb line angulation) β is α＜β.In addition, PD array 28 (with reference to Fig. 2) is set at from the light path of the light 24 of the surface (first surface 70) of the

56 of

20 reflection.

Therefore, because light 90 by part (first inner wall surface, 74 1 sides of the

18 and interface of the resin 19) reflection of first

74 of

18, by the light 92 of part (second inner wall surface, 76 1 sides of the

18 and interface of the resin 19) reflection of second

76 of

18 and by each exit direction of the light 94 of part (interface of

54 and the resin 19) reflection of the

72 of

20 respectively with different by the exit direction of the light 24 of part (

56 of

20 and the interface of the resin 19) reflection of the

70 of

20, therefore, can reduce other reflected light 90,92,94 grades are to the interference effect of this reflected light (separated light) 24.This can improve

22 function for monitoring reliabilities.

Secondly, several variation of the

10A of first embodiment are described with reference to Fig. 4-Figure 12.

At first, as shown in Figure 4, though the optical device 10Aa of first variation has identical substantially structure with the

10A of above-mentioned first embodiment, but difference is:

80 of

20 is parallel to each other with

82 of

20, the

84 of

18 is parallel to each other with the

86 of

18, and

80 of

20 is not parallel mutually with the

84 of

18.

As shown in Figure 5, though the optical device 10Ab of second variation has identical substantially structure with the optical device 10Aa of above-mentioned first variation, difference is: the magnitude relationship of the inclination angle beta of the tilt angle alpha of

18 and

80 is α＞β.

As shown in Figure 6, though the optical device 10Ac of the 3rd variation has identical substantially structure with the optical device 10Aa of above-mentioned first variation, difference is:

80 of

20 is not parallel mutually with

82 of

20.

As shown in Figure 7, though the optical device 10Ad of the 4th variation has identical substantially structure with the optical device 10Aa of above-mentioned first variation, difference is: the

84 of

18 is not parallel mutually with the

86 of

18.

That is, the magnitude relationship of the inclination angle beta of the tilt angle alpha of

18 and

80 is α＞β.In addition, the

20a of

20 touches the bottom 18a of slit 18.At this moment, the

20a of

20 is contacted with the bottom 18a of

18 just can make

20 keep desired angle beta, assembling operation is also easy.

As shown in Figure 9, though the optical device 10Af of the 6th variation has identical substantially structure with the optical device 10Ae of above-mentioned the 5th variation, but difference is: the

86 of

80,

82 and the

18 of

20 is parallel to each other, and the bottom 18a of the

20a of

20 contact slit 18.

At first, the angle of the line segment (being expressed as the lower part 82a of second line segment 82) of the part that the

40 from

20a no show and

15 in

82 of

20 is corresponding, with above-mentioned

82 interior comprise different with the angle of the line segment (being expressed as the top 82b of second line segment 82) of the corresponding part of the

40 of optical fiber 15.That is, the

72 of

20 bends halfway.

In addition, the

84 of

18 and the

86 are parallel to each other.The angle of the lower part 82a of

82 of

20 is identical substantially with the angle of the

86 of slit 18.The top 82b of

82 of

20 and

80 of

20 are parallel to each other.The

20a of

20 contacts with the bottom 18a of

18.

That is, the form of this optical device 10Ag is: contact with the bending side that is formed by the surperficial 72a of the downside of the

20a of

20 and second surface 72 (corresponding to the face of the lower part 82a of second line segment 82) at the bending side that is formed by the bottom 18a of

18 and second

76.

Therefore, in assembling, when inserting

20 in the

18, only need pass through above-mentioned bending side with the above-mentioned bending

18 of

20, just can simply filter

20 be temporarily fixed in the

18 with desired angle, thereby make the assembling of back become easy.

At first,

80 of

20 and

82 are parallel to each other.The

20a of

20 contacts with the bottom 18a of slit 18.In addition, the bottom of the

70 of

20 contacts with the bottom of first

74 of

18, and the upper end of the

72 of

20 contacts with the upper end of second

76 of

18.

At this moment, also same with the optical device 10Ag of above-mentioned the 7th variation, in assembling, filter

20 was inserted in the

18 so that the stage that the

20a of

20 contacts with the bottom 18a of

18, can simply filter

20 be temporarily fixed in the

18 with desired angle, thereby make the assembling of back become easy.

The angle of the line segment (being expressed as the

84a of the 3rd line segment 84) of the part that the

40 from

18a no show and

15 in the 3rd line segment of

18 is corresponding is different with the corresponding angle corresponding to line segment (being expressed as the top 84b of the 3rd line segment 84) partly of the

40 of

15 with comprising in above-mentioned the 3rd line segment 84.That is, first

74 of

20 bends halfway.

This can be from existing actual configuration, promptly, in first

74 of the

70 of

20 and

72 and slit 18 and second

76 structure all parallel to each other substantially, only, promptly make the optical device 10Ai of the 9th variation by first

74 that is cut into

18 from top.This situation with the optical device 10Aa-10Ah that makes first-Di, eight variation is compared and can also be made more simply, and, can freely change the differential seat angle of

18 and filter part 20.Certainly, can also promptly tackle the change etc. of this optical device description.

Even in the optical device 10Aa-10Ai of these first-Di, nine variation, also same with the

10A of above-mentioned first embodiment, other reflected light 90,92 and 94 etc. can be reduced to interference effect, and the reliability of

22 function for monitoring can be improved from the reflected

24 of the part of the

70 of

20.

Secondly, the

10B of second embodiment is described with reference to Figure 13.

As shown in figure 13, in the

10B of this second embodiment, the

70 of

20 is defined as the

100 with the crossing formed line segment of the optical axis place surface level of

22, the

72 of

20 is defined as the

102 with the crossing formed line segment of above-mentioned surface level, first

74 of

18 is defined as the

104 with the crossing formed line segment of above-mentioned surface level, second

76 of

18 and above-mentioned surface level are intersected formed line segment when being defined as the

106, then the

104 and the

106 are parallel to each other, and the

100 and the

104 are not parallel mutually.

At this moment also same with the

10A of above-mentioned first embodiment, other reflected light 90,92,94 etc. can be reduced to interference effect, and the reliability of

22 function for monitoring can be improved from the reflected light 24 (with reference to Fig. 2) of the reflection of the part of the

70 of

20.

In this second embodiment, no matter the

100 and the

104 also can be not parallel mutually and the relation of other line segment.For example, the

100 and the

102 can be parallel to each other or not parallel, and the

100 and the

106 also can be parallel to each other or not parallel.Equally, the

102 and the

104 can be parallel to each other or not parallel, and the

102 and the

106 also can be parallel to each other or not parallel.

As shown in figure 14, the

10A of the optical device 10C of the 3rd embodiment and above-mentioned first embodiment has identical construction substantially.Especially, for example, a

18 is set jointly, and a

20 is inserted in the

18 for the

16 that constitutes by seven

15, and potting

19 in the gap of this slit 18 in this slit 18 and filter

20.

And relative with first

74 of

18 at least face (first surface) 70 of

20 bends to concavity towards above-mentioned first inner wall surface 74.Degree of crook preferably the difference of the middle body of

20 and two end portions more than or equal to 5 μ m smaller or equal to 100 μ m.This be because, during less than 5 μ m, be difficult to be provided with desired angle, during greater than 100 μ m, be difficult to insert

20.

Like this, in the optical device 10C of the 3rd embodiment, for 7 light 15, face (first inner wall surface) 74 relative with the

20 of

18 and the face (first surface) 70 relative with first

74 of the

18 of

20 are not parallel mutually, and then the

70 of

20 is not parallel mutually with second surface 72.Therefore, other reflected light 90,92,94 etc. can be reduced, and the reliability of

22 function for monitoring can be improved interference effect from the reflected light 24 on the surface of the

56 of

20.

Method as

20 has, and for example, can realize at an easy rate by the structure at the surperficial formed

56 of quartz substrate 54.That is, by forming

56, because quartz substrate is produced stress,

54 is bent to concavity by 56 formed of multilayer films.Crooked degree can suitably be adjusted according to the thickness of each tunic that constitutes

56 and the number of plies of material and

56 etc.

As other method, the machining precision (for example, polishing degree) that also preferably adopts the surface by changing

54 and the back side is so that the method for

54

54, can make the machining precision higher (for example, representing) on the surface that forms

56, the machining precision at the back side lower (for example, representing) with finish mark with finish mark .

In addition, as other method, also preferably adopt by when making with extra

54, to the surface and the back side blowing of

54, and then change blows to the air quantity at the surface and the back side so that the method for

54 bendings.By making air quantity to the surface of

54 greater than air quantity to the back side, then the compression stress that the surface produced of the

54 when refining is so just made surface (forming the face of multilayer film a 56) side in the refining stage that is through with and is the

54 of concavity bending than the compression stress height that the back side produced.

Secondly, the

10D of the 4th embodiment is described with reference to Figure 15.

As shown in figure 15, the

10D of the 4th embodiment and the

10A of above-mentioned first embodiment have identical construction substantially, but difference is: first

74 of the

70 of

20, slit 18 is parallel to each other with second

76 of

18, and the

72 of filter part 20 (

54 back sides) is a rough surface.

Certainly, the

70 of

20 also can be not parallel mutually with first

74 of

18.

Usually, from thickness of the reflected light

20 of the first surface 70 (surface of multilayer film 56) of

20 etc. and be subjected to catoptrical strong interference from the

72 of filter part 20.In addition, from the reflected light of the part of first

74 of

18 and recently little from the catoptrical interference of above-mentioned

72 from the catoptrical interference of the part of second

76 of

18.

In the 3rd embodiment, because the

72 of

20 is made rough surface, so penetrate at random and become scattered light from the reflected light of the

72 of filter part 20.Therefore, can reduce effectively from the reflected light of

72, and can improve the reliability of

22 function for monitoring effectively catoptrical interference effect from the

70 of

20.

Have as the method for

54 back sides being made rough surface, for example, when processing

54, use the low thicker grinding tool of particle of granularity number to carry out abrasive method.Preferably adopt with chemicals etching methods such as hydrofluorite.In addition, also can adopt Laser Processing to make the method for fiber fuse, or only change near the method for the shape of inner core with same laser with the change surface state.

In addition, when making

54 with spin coating (spin coating), be pre-formed by surface at the spin coating part concavo-convex, thereby can be with the above-mentioned concavo-convex back side that is transferred to

54.

When making

54 with the glass compacting, by in advance the part at the back side that is used to form

54 in the metal die being made rough surface, thereby can be when compacting finishes the above-mentioned rough surface of metal die be transferred on the back side of

54.

In the

10D of above-mentioned the 4th embodiment, though only the

72 of

20 is made rough surface, but, the optical device 10Da of variation as shown in figure 16 is such, and first

74 of

18 and second

76 wait other face also can all make rough surface.At this moment, owing to be scattered light, so can further reduce to catoptrical interference effect from the

70 of

20 from the reflected light of the part of first

74 of

18 with from the reflected light of the part of second

76 of

18.

In addition, the

10E of the 5th embodiment as shown in figure 17 is such, the end face and end face that will have the

12A of the V-shaped

14A that fixes the

16A with

12B of the V-shaped

14B that fixes the second fiber array 6B, and the end face of the end face of the

16A and the

16B combines by light splitting part 20.At this moment, make it be aligned with each other the center by first and

16A and 16B are adjusted, and be individually fixed among each V-shaped

14A and 14B of first and second glass substrate.According to the 5th embodiment, its

10A-10D with first-Di, four embodiment is different, the problem of

12 strength degradation that taken place in the time of needn't considering to increase the degree of depth of

18.

In the

10A-10E of above-mentioned first-Di, five embodiment, though the example of the fiber array of having represented to be applicable to that

15 is arranged in 16, still, also applicable to for example on the LN substrate, arranging the optical waveguide array that becomes by a plurality of optical waveguides that forms.

Secondly, the example application according to the

10A of first embodiment is described.At first, make the

12 that is used for single-column

16 by attrition process.

As the material of

12, used borosilicate glass (, specifically using Pyrex (registered trademark) glass material) at this.The size of

12 is long 16mm, thick 1mm, and being used to make the V-shaped

14 of

16 proper alignment is that 250 μ m, the degree of depth are 12 of 90 μ m by attrition process formation spacing.

Then, carry out the assembling of fiber array 16.It is the strap-like member (12-core tape-armored fiber assembly) of the 12 core fibre band protective sleeves of 250 μ m that

16 uses spacing.The middle protective sleeve of the strap-like member of 12 core fibre band protective sleeves is peelled off, and the length of the part that protective sleeve is peelled off in the middle of making is 12mm, then it is positioned in the V-shaped

14 of

12, and with UV cured type adhesive securement.

Then,

16 is carried out the processing of slit 18.

18 wide 30 μ m, dark 200 μ m, tilt angle alpha are 20 °.

Then, make filter part 20.For example form on

54 from

56 such as tantalum oxide, quartz, alumina, titanium dioxide by evaporation, the

54 that will be formed with

56 then is processed into the shape of thick 20 μ m, long 5mm, wide 200 μ m and is made into filter part 20.It is transmissivity 93%, reflectivity 7% that the angle of inclination is designed to 20 °, segregation ratio.

, filter

20 inserted slit 18 in, adjust at positioning stage again, make the inclination angle beta of 70 pairs of optical axises of first surface of

20 be for example 20.5 °-21

20 is inserted in the

18, and under the state fixing,

19 is filled in the

18 with above-mentioned inclination angle beta.It is resin that

19 uses the refractive index silicon identical substantially with the refractive index of the

40 of optical fiber 15.Behind potting

19, make this

19 sclerosis.

28 be installed to auxiliary fixing

30 on thereafter.The number of channel of

28 is 12 channels, is of a size of high 150 μ m, wide 420 μ m, long 3mm.

The

10A of the structure of

28 and first embodiment is same, adopts back surface incident type.Anisotropic

58 has been filled on the top of active layer 26 (

30 1 sides).

Secondly, carry out the aligning of PD array.Particularly, the

32 that will be used for determining the spacing of

16 and

28 is installed in auxiliary fixing

30.

The constituent material of

32 is borosilicate glasses, at this moment, is specially Pyrex (registered trademark) glass material.In addition, gap length is set at 10 μ m.That is, owing to comprise that the thickness of the

28 of the

62 of Au is 190 μ m, so

32 is decided to be 200 μ m.

And, for the

26 that makes

28 is positioned on the light path from the reflected

24 of the

70 of

20, on one

28 is carried out aligning, by

32

30 is installed on the

16 on one side.

And, the optical device of example application has been carried out evaluation of measuring.By the catoptrical influence that refringence causes, present the characteristic variations of the light receiving efficiency that causes because of temperature variation along with

28 and the characteristic variations of the light receiving efficiency of

28 behind high temperature and humidity test and become more remarkable.Therefore, assess with comparative example with regard to these 2.

The structure that comparative example has is, in the

10A of the 1st embodiment, the difference of the inclination angle beta of the

70 of the tilt angle alpha of

18 and filter

20 set for less than 0.5 degree.

1. optical device is characterized in that:

Have:

Optical transmission means (15),

The slit (18) that is provided with in the above-mentioned optical transmission means (15),

Insert in the above-mentioned slit (18), be used for separating the part of the flashlight (22) that transmits by above-mentioned optical transmission means (15) filter part (20),

Be filled in interior above-mentioned slit (18) of above-mentioned slit (18) and the resin (19) in the gap between above-mentioned filter part (20);

Above-mentioned filter part (20) has substrate (54) and is formed at optical thin film (56) on the first type surface of above-mentioned substrate (54);

When with above-mentioned filter part, (20) above-mentioned optical thin film, the face of (56) one sides is defined as first surface, (70), with above-mentioned filter part, (20) above-mentioned substrate, the face of (54) one sides is defined as second surface, (72), at above-mentioned slit, (18) in the inner wall surface, will with above-mentioned filter part, (20) above-mentioned first surface, (70) relative face is defined as first inner wall surface, (74), will with above-mentioned filter part, (20) above-mentioned second surface, (76) relative face is defined as second inner wall surface, (76) time

One or more the first surfaces (70) with above-mentioned filter part (20) in the above-mentioned second surface (72) of first inner wall surface (74) of above-mentioned slit (18), above-mentioned second inner wall surface (76) and above-mentioned filter part (20) are not parallel.

2. optical device according to claim 1 is characterized in that: above-mentioned uneven two surperficial angulations are more than or equal to 0.5 °.

3. optical device according to claim 1 is characterized in that:

The above-mentioned first surface (70) of above-mentioned filter part (20) and vertical crossing formed line segment in optical axis place of above-mentioned flashlight (22) are defined as first line segment (80), the above-mentioned second surface (72) of above-mentioned filter part (20) is defined as second line segment (82) with above-mentioned vertical crossing formed line segment, above-mentioned first inner wall surface (74) of above-mentioned slit (18) is defined as the 3rd line segment (84) with above-mentioned vertical crossing formed line segment, above-mentioned second inner wall surface (76) of above-mentioned slit (18) is intersected formed line segment when being defined as the 4th line segment (86) with above-mentioned vertical

One or more line segments and above-mentioned first line segment (80) in above-mentioned second line segment (82), above-mentioned the 3rd line segment (84) and above-mentioned the 4th line segment (86) are not parallel.

4. optical device according to claim 3 is characterized in that:

Above-mentioned first line segment (80) and above-mentioned second line segment (82) are not parallel mutually;

Above-mentioned the 3rd line segment (84) and above-mentioned the 4th line segment (86) are not parallel mutually;

Above-mentioned first line segment (80) and above-mentioned the 3rd line segment (84) are not parallel mutually.

5. optical device according to claim 3 is characterized in that:

Above-mentioned first line segment (80) and above-mentioned second line segment (82) are parallel to each other;

Above-mentioned the 3rd line segment (84) and above-mentioned the 4th line segment (86) are parallel to each other;

Above-mentioned first line segment (80) and above-mentioned the 3rd line segment (84) are not parallel mutually.

6. optical device according to claim 3 is characterized in that:

Above-mentioned first line segment (80) and above-mentioned second line segment (82) are not parallel mutually;

Above-mentioned the 3rd line segment (84) and above-mentioned the 4th line segment (86) are parallel to each other;

Above-mentioned first line segment (80) and above-mentioned the 3rd line segment (84) are not parallel mutually.

7. optical device according to claim 3 is characterized in that:

Above-mentioned first line segment (80) and above-mentioned second line segment (82) are parallel to each other;

Above-mentioned the 3rd line segment (84) and above-mentioned the 4th line segment (86) are not parallel mutually;

Above-mentioned first line segment (80) and above-mentioned the 3rd line segment (84) are not parallel mutually.

8. optical device according to claim 1 is characterized in that:

The above-mentioned first surface (70) of above-mentioned filter part (20) is defined as the 5th line segment (100) with the crossing formed line segment of the surface level at the optical axis place of above-mentioned flashlight (22), the above-mentioned second surface (72) of above-mentioned filter part (20) is defined as the 6th line segment (102) with the crossing formed line segment of above-mentioned surface level, above-mentioned first inner wall surface (74) of above-mentioned slit (18) is defined as the 7th line segment (104) with the crossing formed line segment of above-mentioned surface level, above-mentioned second inner wall surface (76) of above-mentioned slit (18) and above-mentioned surface level are intersected formed line segment when being defined as the 8th line segment (106)

One or more line segments and above-mentioned the 5th line segment (100) in above-mentioned the 6th line segment (102), above-mentioned the 7th line segment (104) and above-mentioned the 8th line segment (106) are not parallel.

9. optical device according to claim 8 is characterized in that:

Above-mentioned the 7th line segment (102) and above-mentioned the 8th line segment (104) are parallel to each other;

Above-mentioned the 5th line segment (100) and above-mentioned the 7th line segment (102) are not parallel mutually.

10. optical device is characterized in that:

Have:

A plurality of optical transmission means (15),

The slit (18) that is provided with jointly in above-mentioned a plurality of optical transmission means (15),

Insert in the above-mentioned slit (18), be used for separating the filter part (20) of each part of the flashlight (22) that transmits by above-mentioned a plurality of optical transmission means (15),

Be filled in interior above-mentioned slit (18) of above-mentioned slit (18) and the resin (19) in the gap between above-mentioned filter part (20);

Above-mentioned filter part (20) has relative with above-mentioned slit (18) at least curved surface (70).

11. an optical device is characterized in that:

Have:

Optical transmission means (15),

The slit (18) that is provided with in the above-mentioned optical transmission means (15),

Insert in the above-mentioned slit (18), be used for separating the filter part (20) of the part of the flashlight (22) that transmits by above-mentioned optical transmission means (15),

Be filled in interior above-mentioned slit (18) of above-mentioned slit (18) and the resin (19) in the gap between above-mentioned filter part (20);

Above-mentioned filter part (20) has substrate (54) and is formed at optical thin film (56) on the first type surface of above-mentioned substrate (54);

When with above-mentioned filter part, (20) above-mentioned optical thin film, the face of (56) one sides is defined as first surface, (70), with above-mentioned filter part, (20) above-mentioned substrate, the face of (54) one sides is defined as second surface, (72), at above-mentioned slit, (18) in the inner wall surface, will with above-mentioned filter part, (20) above-mentioned first surface, (70) relative face is defined as first inner wall surface, (74), will with above-mentioned filter part, (20) above-mentioned second surface, (72) relative face is defined as second inner wall surface, (76) time

The above-mentioned second surface (72) of above-mentioned at least filter part (20) is a rough surface.

12. optical device according to claim 11 is characterized in that: above-mentioned first inner wall surface (74) and above-mentioned second inner wall surface (76) of above-mentioned slit (18) are rough surfaces.

13., it is characterized in that according to claim 11 or 12 described optical device:

Surfaceness Rt as the face of above-mentioned rough surface is 0.05 μ m≤Rt 〉=2 μ m.

14. according to each described optical device among the claim 1-13, it is characterized in that: the part of the bottom surface (20a) of above-mentioned at least filter part (20) contacts with above-mentioned slit (18) bottom (18a).