JP2019211702A - Optical element and optical device - Google Patents

Abstract

To provide an optical element and an optical device which have an excellent form accuracy, and lens function of inhibiting adhesive used from protruding toward an optical surface.SOLUTION: An optical element 1 comprising an optical member 2 and a lens chip 3 which are stacked one on top of another includes a stepped part 5 on a side face of the optical element 1. The optical device comprises the optical element 1 and a holder for holding the optical element 1. The stepped part 5 is preferably provided on the side face of at least one of the optical member 2 and the lens chip 3.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to an optical element and an optical apparatus, and more particularly to an optical element and an optical apparatus having a predetermined stepped shape.

  As an optical element used for optical coupling between an optical fiber and a light receiving / emitting element in an optical device using an optical fiber, an optical element having a lens on a light incident / exit surface is known. This optical element can reduce the height of the optical device.

  When such an optical element is integrally provided with a lens function, a method of forming by a mold press is known (for example, see Patent Document 1).

JP 2011-248312 A

  However, when an optical element is formed by a mold press, it is difficult to obtain a highly accurate optical element due to shrinkage of a material during molding. For example, in applications that require high angular accuracy such as prisms, the required optical functions may not be sufficient.

  Also, when molding with a mold press, when processing to increase accuracy, the surface provided with the lens is very difficult to process, and if the most important lens part in the optical element is defective, Even if there is no problem in the portion, the optical element itself cannot be used.

  Further, when the optical element is fixed at the time of use, for example, the optical element is held by a holder or the like. Usually, the optical element is fixed to the holder or the like by an adhesive. At this time, in order to set the optical axis accurately, the sizes of the optical element and the holder are strictly matched. Therefore, the gap between the optical element and the holder is very narrow, and if the adhesive is applied excessively, it may protrude from the adhesive surface to the optical surface and affect the product quality. Management is required.

  Therefore, in view of the above situation, an object of the present invention is to provide an optical element and an optical apparatus having a lens function with a simple operation and good shape accuracy.

  As a result of intensive research, the inventors have integrated an optical function and a lens function without using heat processing like a mold press, and are used when fixing to other members during use. The present inventors have found an optical element and an optical device using such an optical element that can prevent the adhesive from protruding on the optical surface from affecting the optical surface, and the present invention has been completed.

  That is, the optical element of the present invention is an optical element in which an optical member and a lens chip are laminated, and is characterized in that a stepped portion is provided on a side surface of the optical element.

  The optical device of the present invention includes the optical element of the present invention and a holder for holding the optical element, and an adhesive is applied to a space formed by the inner surface of the holder and the stepped portion of the optical element. It is characterized by having.

  According to the optical element of the present invention, it has good shape accuracy and has a stepped portion on the side surface of the optical element, so that the adhesive to be used can be prevented from protruding to the optical surface.

  According to the optical device of the present invention, it is possible to suppress the adhesive used at the time of manufacture from flowing out to the optical surface, particularly the surface of the lens, and to exhibit a predetermined function satisfactorily.

It is a side view explaining the schematic structure of the optical element of 1st Embodiment. It is a side view explaining the schematic structure of the optical element of 1st Embodiment. It is a side view which mounted | wore the holder with the optical element of 1st Embodiment. It is a figure explaining the manufacturing method of the optical element of 1st Embodiment. It is a figure explaining the manufacturing method of the optical element of 1st Embodiment. It is a figure explaining the manufacturing method of the optical element of 1st Embodiment. It is a figure explaining the manufacturing method of the optical element of 1st Embodiment. It is a figure explaining the manufacturing method of the optical element of 1st Embodiment. It is a figure explaining the manufacturing method of the optical element of 1st Embodiment. It is a figure explaining the manufacturing method of the optical element of 1st Embodiment. It is sectional drawing which showed schematic structure of the optical element of 2nd Embodiment. It is sectional drawing which showed schematic structure of the optical element of 2nd Embodiment. It is sectional drawing which showed schematic structure of the optical element of 2nd Embodiment. It is sectional drawing which showed schematic structure of the optical element of 3rd Embodiment. It is sectional drawing which showed schematic structure of the optical element of 3rd Embodiment.

  Hereinafter, the optical element of the present invention will be described in detail with reference to embodiments. However, the present invention is not limited to the following embodiments, and can be arbitrarily modified without departing from the gist of the present invention.

(First embodiment)
[Optical element]
The optical element according to the first embodiment of the present invention has the above-described configuration, and is configured by stacking an optical member and a lens chip. And the step part is formed in the side surface of this optical element. Examples of such an optical element include an optical element 1 in which an optical member 2, a lens chip 3, and an adhesive layer 4 are laminated and integrated as shown in FIGS. 1A and 1B. . Hereinafter, the case where the optical member shown in FIG. 1A has a stepped portion will be described in detail as an example.

<Optical member>
The optical member 2 used in the present embodiment is a member having a predetermined optical function, and a known optical member can be used without particular limitation. As the optical member 2, a member having a predetermined shape and characteristics is used according to the purpose, and examples thereof include a prism, an optical filter, a polarizing plate, and a diffractive optical element (DOE).

  The optical member 2 should just have a predetermined optical characteristic, The material is not specifically limited, A well-known material is mentioned. Examples of the material of the optical member 2 include glass, resin, crystal and the like. Generally, the refractive index of the material used for the optical member 2 is 1.4 to 2.25, typically 1.5 to 2.1.

  And the optical member 2 shown to FIG. 1A as an example of this embodiment has the step part 5 in the side surface. The optical member 2 is generally used by being fixed to another member such as a holder when assembled with the apparatus in use. At this time, the stepped portion 5 has an effect of preventing the adhesive used at the time of fixing from protruding from the adhesive surface to the surroundings (particularly the optical surface). The side surface of the optical member 2 refers to an outer peripheral surface that does not include the surface on which the lens chip 3 is laminated. For example, it may be an outer peripheral surface orthogonal to the surface on which the lens chip 3 of the optical member 2 is laminated, or a light incident / light emitting surface on which the lens chip 3 of the optical member 2 is not laminated, and is not limited to this. Absent.

  Specifically, as shown in FIG. 2, when the optical element 1 is fixed to the holder 100, a high step portion of the optical element 1 on the side surface of the optical member 2 is in close contact with the holder 100. Are bonded and fixed as an adhesive surface by an adhesive. In general, the position of the optical element 1 is strictly controlled in order to align the optical axis of the lens. Therefore, the size of the optical element 1 is the same at the joint portion with the holder 100 and the interval is very narrow.

  Therefore, a small amount of the necessary adhesive is sufficient for bonding with the holder 100, and the amount of application must be strictly controlled. However, since the interval is very narrow as described above, the allowable width is also narrow, and it is often difficult to achieve a predetermined coating amount. Here, when the coating amount is increased, if there is no stepped portion 5, the excess adhesive is provided between the optical element 1 and the holder 100 to the outside, specifically, the upper surface or the lower surface of the optical element 1. It will protrude. If the adhesive protrudes from the upper surface and spreads to the optical surface, it affects the optical characteristics and makes it impossible to obtain a desired optical element.

  On the other hand, according to the optical element 1 of the present embodiment, the stepped portion 5 is provided on the side surface of the optical member 2 as described above, and the gap 101 can be provided between the optical element 1 and the holder 100. . Therefore, even if there is an excessive adhesive, it can be accommodated in the gap 101 and can be prevented from protruding to the periphery of the adhesive surface.

That is, the stepped portion 5 is formed on the side surface of the optical member 2 so as to be joined to another member such as a holder. And a low portion (a portion having a small diameter). In FIG. 1A, a stepped portion 5 is formed on the optical member 2, and a low portion is continuously formed up to the lens chip 3, which is effective for suppressing protrusion of the adhesive. The stepped portion may be formed on the lens chip 3 or may be formed across both the optical member 2 and the lens chip 3, or as shown in FIG. 1B, the optical member 2 and the lens. One of the chips 3 may be formed to be slightly smaller than the other outer shape and include a stepped portion, and it is sufficient if the lower portion region is formed to such an extent that the adhesive can be prevented from protruding.
If the stepped portion 5 is provided on either side of the optical member 2 and the lens chip 3, the stepped portion 5 is formed only on the side of one member as shown in FIG. 1A. In this case, the stepped portion is formed when a force in a direction perpendicular to the optical axis is applied to the optical element as compared with the case where the stepped portion 5 is formed by the difference in the external dimensions of the two members (the form shown in FIG. 1B). Since 5 is shifted from the laminated surface of the optical member 2 and the lens chip 3, damage from the stepped portion 5 is suppressed, which is preferable. Further, it is preferable to have the stepped portion 5 on either side of the optical member 2 and the lens chip 3 because the stepped portion 5 has a chamfered shape and damage from the stepped portion 5 is suppressed.

  In addition, in the connection portion between the stepped portion 5 and the side surface (high portion) of the optical member 2 or the lens chip 3, it is preferable that the angle formed by the surface and the side surface of the stepped portion 5 is an obtuse angle or a right angle. Here, the obtuse angle means a corner where the cross-sectional angle exceeds 90 ° C. By doing in this way, generation | occurrence | production of the crack in a connection part, a chip, etc. can be suppressed. In particular, if the angle formed between the surface and the side surface of the stepped portion 5 is an obtuse angle, the effect of suppressing the occurrence of cracks, chips, etc. at the connection portion is high and preferable.

  1A and 2 show an example in which the stepped portion 5 is formed near the bonding surface with the lens chip 3, but the optical member 2 is formed near the surface facing the bonding surface. May be.

<Lens chip>
The lens chip 3 used in the present embodiment is used in combination with the optical member 2 and has optical characteristics that can exhibit predetermined characteristics by the combination. That is, the lens chip 3 only needs to have a predetermined lens function according to the required characteristics.

  The lens chip 3 has a shape having a lens shape on the surface of a flat transparent substrate, and includes a transparent substrate 3A and a lens 3B having a lens shape. That is, when viewed in plan, the lens 3B is provided on the inner side, and a flat portion made of the transparent substrate 3A is provided around the lens 3B. The lens 3B and the transparent substrate 3A may be integrally formed of the same material, or may be separately formed of the same material or different materials and bonded together. The lens shape of the lens 3B may be a convex shape, a concave shape, or a combination thereof.

  The lens chip 3 only needs to have a predetermined optical characteristic, and the material thereof is not particularly limited as long as it is formed of a known material. Examples of the material of the lens chip 3 include glass and resin, and the transparent substrate 3A and the lens 3B can be formed of different materials such as glass on one side and resin on the other side.

  At this time, the material for forming the lens chip 3 is affected by the required optical function. For example, a material having a refractive index of 1.4 to 2.25 can be used, and the refractive index is 1.4. ~ 2.1 is preferred. Furthermore, when using resin as a material which forms this lens chip 3, 1.4-1.7 are preferable.

  Further, when the transparent substrate 3A and the lens 3B are formed of different materials, the material for forming the transparent substrate 3A has a refractive index of 1.4 to 2 as in the material for forming the lens chip 3. 25 is preferable, and 1.4 to 2.1 is preferable. On the other hand, as a material for forming the lens 3B, the refractive index is preferably 1.4 to 2.25, and more preferably 1.4 to 2.1. The transparent substrate 3A and the lens 3B have a refractive index difference of preferably 0.4 or less, and more preferably 0.3 or less.

  The thickness of the transparent substrate 3A of the lens chip 3 is preferably 0.02 to 3 mm, and more preferably 0.02 to 0.5 mm, from the viewpoint of not reducing the effect of using the total reflection light of the prism 2 and extending the optical path. . When this thickness is less than 0.02 mm, handling properties are reduced during production and use, and the productivity of the optical element is reduced.If it is more than 3 mm, the distance between the lens surface and the prism is increased, There is a risk of hindering the reduction in height of the optical element and the optical device using the optical element.

  The lens chip 3 is provided on the optical surface of the optical element 2. That is, the optical element 2 is provided on the light incident surface or the light emitting surface. The lens chip 3 is bonded and fixed to the optical surface of the optical element 2 so that predetermined optical characteristics can be exhibited by an adhesive layer described later.

  When viewed in plan, the lens chip 3 may have the same size and shape as the joint portion with the optical member 2 or may be smaller than the joint portion with the optical member 2. That is, as shown in FIG. 1A, the size is preferably the same as or smaller than the lower portion (the portion having a small diameter) of the stepped portion 5 of the optical member 2 described above. However, since the formation of the step is not limited to this and can take various shapes, the lens chip 3 may have a stepped portion, and may have a stepped portion and a low portion, or a stepped portion. The optical member 2 may be connected to the optical member 2 at this high portion, and the optical member 2 may have a stepped portion. In addition, the lens chip 3 and the optical member 2 may have different external shapes, and a stepped portion may be formed at these joint portions.

The outer periphery of the lens chip 3 is preferably a rough surface having a surface roughness Ra of 0.1 to 10 μm. Here, the outer periphery means not the light transmission surface of the lens chip 3 but the side surface. By making the outer periphery of the lens chip 3 rough as described above, the light incident on the inside of the lens chip is scattered and is not easily generated as stray light.
If the surface roughness Ra is less than 0.1 μm, the effect of scattering the light may not be sufficient. If the surface roughness Ra exceeds 10 μm, debris is generated from the outer periphery of the lens chip 3 during the transportation of the optical element. There is a risk of lowering the light transmittance.
In this specification, the surface roughness Ra conforms to the provisions of JIS B 0601: 1999.

<Adhesive layer>
The adhesive layer 4 used in this embodiment is an adhesive that bonds the optical element 2 and the lens chip 3 as described above. The adhesive layer 4 is preferably a layer made of an adhesive having light transmittance after curing so that desired optical characteristics can be obtained. Conventional adhesives conventionally used for the production of optical elements can be used. It can be used as it is.

  Examples of the adhesive used for the adhesive layer 4 include an adhesive such as an epoxy resin, a silicone resin, and an acrylic resin. Examples of the curing system include a photocuring type and a thermosetting type, and a photocuring type is preferable, and an ultraviolet curing type is more preferable. By adopting the photo-curing type, the product characteristics can be satisfactorily maintained without causing damage to the optical element 2 and the lens chip 3 due to heat during manufacturing.

  The refractive index of the adhesive layer 4 is preferably 1.4 to 1.6. Furthermore, the refractive index difference of the lens chip 3 and the refractive index of the adhesive layer 4 is preferably within 0.4, more preferably within 0.3. When the lens chip 3 is made of the transparent substrate 3A and the lens 3B made of different materials, the relationship between the refractive index of the transparent substrate 3A and the refractive index of the adhesive layer 4 (the difference in refractive index is 0. 0). 4 or less).

  In the present specification, “refractive index” represents a refractive index (nd) with respect to d-line (wavelength: 587.57 nm, excitation medium element: He).

[Method for Manufacturing Optical Element]
In the method of manufacturing an optical element according to this embodiment, first, a process of obtaining a lens base material by forming a plurality of lenses on the surface of a transparent substrate is performed. Next, a process of laminating an optical member at a position corresponding to the lens of the lens substrate to form a lens laminate is performed. Finally, a process of cutting the lens laminate to obtain an optical element in which a lens chip is laminated on an optical member is performed.

Hereinafter, each step will be described in detail.
(Lens substrate forming process)
First, in forming a lens base material, a transparent substrate 30A is prepared (FIG. 3A). This transparent substrate 30 </ b> A is cut by a cutting process described later, and becomes the transparent substrate 3 </ b> A of the lens chip 3.

  A plurality of lenses 3B are provided on the surface of the transparent substrate 30A to form a lens base material (FIGS. 3B and 3C). In forming the lens 3B, it is preferable to form the lens 3B in a grid pattern. 3B schematically shows a side view of the lens substrate, and FIG. 3C schematically shows a plan view of the lens substrate of FIG. 3B. Here, the number of lenses to be formed can be appropriately set according to the size of the transparent substrate 30A to be used, the size of the lens to be formed, and the like.

  In order to create this lens substrate, the transparent substrate 30A and the lens 3B may be integrally formed by machining, molding, injection molding, three-dimensional modeling, or the like, or the transparent substrate 30A may be formed by imprint molding. Examples of the method include molding the lens 3B on the surface, forming the transparent substrate 30A and the lens 3B individually, and bonding the lens 3B to the surface of the transparent substrate 30A. Among them, forming the lens 3B by imprint molding on the flat transparent substrate 30A is easy to manufacture, reduces cost, supports the manufacture of small-diameter lenses, and has a wide range of material selection according to the lens function. This is preferable in terms of lens surface shape accuracy and the like.

(Lamination process)
Next, an optical member is laminated on the obtained lens base material to form a lens laminate (FIG. 3D). The optical member used at this time is preferably a rectangular parallelepiped rod-shaped optical member 2A or an individual optical member 2. The rod-shaped optical member 2 </ b> A is cut into a plane perpendicular to the longitudinal direction to become the optical member 2 and can be an element constituting the optical element 1.

  Here, an example will be described in which a rod-shaped optical member 2A is used as the optical member and is arranged in accordance with the position of the lens 3B formed on the transparent substrate 30A.

  In FIG. 3D, the optical member 2A is arranged so as to overlap the three lenses 3B in a planar manner. At this time, the three lenses 3B are aligned in a line in the depth direction of the drawing. The one optical member 2A is arranged so as to overlap the one row of lenses 3B.

  The optical members 2A are preferably arranged adjacent to each other, and the distance between the optical members 2A is more preferably smaller than the thickness of the blade of the cutter 110 used in the cutting process described later. Since the optical member 2A is also scraped by the cutter 110 at the time of cutting by disposing the gap in this way, it can also be used to form the step of this embodiment, and this step used this manufacturing process. It can also be used to identify things.

  In this laminating step, the lens base material and the optical member 2A are laminated via the adhesive layer 4. In this laminating, they are fixed to each other and laminated. Here, for fixing, a known adhesive used for the production of an optical element can be used, and it can be used without particular limitation as long as it does not impair the desired optical properties.

(Cutting process)
Next, the optical element 1 is obtained by cutting the lens stack (FIGS. 3E and 3F). At this time, as shown in FIG. 3E, the cutting may be performed by a known method along the cutting line so as to separate the lenses 3B one by one. What is necessary is just to cut | disconnect member 2A. As a cutting method, dicing, a wire saw, or the like can be used. The cutter 110 refers to a processing jig used for cutting including a dicing blade and a wire saw used in these cutting methods. By this cutting, the adhesive layer 4 is trimmed and aligned with the cut shape of the transparent plate 30A. Therefore, for example, the gap 101 is effectively and stably formed on the holder 100 as shown in FIG. You can also.

  At this time, in the cutting between the optical member 2A and the optical member 2A adjacent thereto, the optical members 2A can be separated from each other only by cutting the transparent substrate 30A. Therefore, as shown in FIG. 3F, at this time, the cutter 110 advances the cutter 110 halfway in the vertical direction (vertical direction in the drawing) so that the stepped portion 5 is formed on the side surface of the optical member 2A. It is preferable to use a so-called half cut that stops and cuts off in the horizontal direction.

  By half-cutting in this way, the stepped portion 5 is formed by the blade of the cutter, and the surface shape reflects the shape of the blade of the cutter 110 in cutting, and the cross-sectional shape of the stepped portion 5 is an acute angle. Therefore, it is not necessary to chamfer again.

  As described above, it is preferable to form the stepped portion 5 in this cutting step. However, all the cuts are cut so that the side faces have the same height, and the stepped portion 5 is processed and formed later. May be. Further, when the optical member and the lens chip are cut to have different external shapes, the difference in the external shape can be a stepped portion. Furthermore, as another method, the optical member and the lens chip can be manufactured so as to obtain a stepped portion by simply separating the optical member and the lens chip so that the outer shapes thereof are different from each other and joining them.

  Further, after cutting, chamfering may be performed on a ridgeline formed by cutting. By chamfering, cracks and chips can be suppressed.

  In the above description with reference to FIGS. 3A to 3F as the optical member, the cuboid rod-shaped optical member 2A has been described as an example. However, as described above, a prism may be used as the optical member. When a triangular prism is used as the prism, the surface on which the stepped portion is formed by cutting is used as the optical surface. Therefore, as shown in FIG. It is preferable to determine the stop position in the upward direction.

(Second Embodiment)
As in the first embodiment, the second embodiment of the present invention is configured by laminating an optical member 2 and a lens chip 3 having a transparent substrate 3A and a lens 3B, and has a stepped portion 5. In addition, the optical element further includes a light-shielding film formed of a light-shielding material.

  The light shielding film is formed on the outer peripheral portion (also referred to as an edge) outside the optical effective surface in the optical surface portion of the optical element, and is provided with an opening at the center. In this way, the central portion can be opened to transmit light, and the surroundings can be shielded, so that flares and ghosts caused by internal reflection can be suppressed. Further, the light shielding film can also provide a diaphragm function.

  This embodiment is a configuration in which a light shielding film is further provided in the first embodiment, the description of the configuration common to the first embodiment is omitted, and only the difference will be described below. In the second embodiment, as described above, a light shielding film is additionally provided to the optical element 1 of the first embodiment.

  There are several variations in the form of forming the light shielding film. For example, as shown in FIG. 4A, an optical element 11 provided with a light shielding film 12 on the surface of the transparent substrate 3A of the lens chip 3 and the surface of the lens 3B, For example, as shown in FIG. 4B, an optical element 21 provided with a light shielding film 22 between the surface of the transparent substrate 3A of the lens chip 3 and the transparent substrate 3A and the lens 3B, for example, as shown in FIG. Examples thereof include an optical element 31 provided with a light shielding film 32 between the optical member 2 and the transparent substrate 3A of the lens chip 3.

  Such light shielding films 12, 22, and 32 are provided in order to obtain a diaphragm function as described above, and a known material having a light shielding property can be provided by a known method without particular limitation.

  Further, the optical elements 11, 21, 31 provided with these light shielding films 12, 22, 32 can be manufactured based on the manufacturing method of the optical element 1 described in the first embodiment. In contrast, a process of forming a light shielding film at a predetermined timing may be added.

  In manufacturing the optical element 11, for example, after providing the lens 3B on the transparent substrate 30A to form a lens base material, the light shielding film 12 may be formed on the lens base material before being laminated with the optical member. .

  In manufacturing the optical element 21, for example, the light shielding film 22 may be formed on the transparent substrate 30A before the lens 3B is formed on the transparent substrate 30A, and then the lens 3B may be formed.

  In manufacturing the optical element 31, for example, before the lens base material and the optical member 2A are laminated, the light shielding film 32 is formed on the lens base material or the optical member 2A, and then the lens base material and the optical member 2A are attached. What is necessary is just to laminate.

  It is preferable to form a light-shielding film on the surface of the lens substrate like the optical elements 21 and 31 because manufacturing is easy and shape accuracy of the formed film is good.

(Third embodiment)
As in the first and second embodiments, the third embodiment of the present invention is configured by laminating the optical member 2 and the lens chip 3, and has a stepped portion 5. The optical element has an antireflection film between the surface of the optical element or between the optical member 2 and the adhesive layer 4.

  This embodiment is a configuration in which an antireflection film is further provided in the first embodiment or the second embodiment, and the description of the configuration common to the first and second embodiments is omitted. Only the point will be described.

In the third embodiment, for example, an optical element 1 of the first embodiment provided with an additional antireflection film may be used. For example, as shown in FIG. 5A, there is an optical element 41 in which an antireflection film 42 is provided on the entire surface of the transparent substrate 3A and the surface of the lens 3B on the light incident side.
Moreover, for example, as shown in FIG. 5B, an optical element 51 in which an antireflection film 52 is provided between the adhesive layer 4 and the optical member 2 can be mentioned.

The antireflection films 42 and 52 can be formed by a known method using a known material in order to reduce reflection on the surface of the optical element 1. The antireflection film 42 can be formed of a dielectric multilayer film in which, for example, TiO ₂ and SiO ₂ are used as a high refractive index material and a low refractive index material, and these are alternately stacked. As the antireflection film 52, a known configuration such as a single layer film of Al ₂ O _{3 or} a _three- layer film of a medium refractive index film, a high refractive index film, and a medium refractive index film may be used. By providing such an antireflection film 42 on the surface of the optical element 41 or an antireflection film 52 between the adhesive layer 4 of the optical element 51 and the optical member 2, for example, the reflectance of the surface is greatly increased. Can be reduced.

  The antireflection films 42 and 52 are generally obtained by forming a dielectric material by vacuum film formation such as vacuum deposition, sputtering, and CVD.

  Further, the optical elements 41 and 51 provided with the antireflection films 42 and 52 can be manufactured based on the manufacturing method of the optical element 1 described in the first embodiment. What is necessary is just to add the process of forming an antireflection film at a predetermined timing. For example, after forming a plurality of lenses 3B on the surface of the transparent substrate 30A to form a lens base material, the lens base material is reflected on the surface of the transparent base material 3A and the surface of the lens 3B before being laminated with the optical member 2A. The prevention film 42 may be formed. Alternatively, the antireflection film 52 may be formed on the light incident surface of the optical member 2A before the transparent substrate 30A and the optical member 2A are laminated.

  In addition, although it demonstrated based on 1st Embodiment above, in addition to 2nd Embodiment as mentioned above, you may form an anti-reflective film, and in the range which does not inhibit the effect of this invention, other An antireflection film may be formed on the optical element having the film.

  In the case of forming the antireflection film in the second embodiment, in any case, the antireflection film may be formed as described above before the lens substrate and the optical member are laminated. In the embodiment in which the light shielding film is formed on the surface of the lens 3B, it is preferable to form the antireflection film after the light shielding film is formed.

  DESCRIPTION OF SYMBOLS 1, 11, 21, 31, 41, 51 ... Optical element, 2, 2A ... Optical member, 3 ... Lens chip, 3A, 30A ... Transparent substrate, 3B ... Lens, 4 ... Adhesive layer, 5 ... Stepped part, 12, 22, 32 ... light shielding film, 42, 52 ... antireflection film, 100 ... holder, 101 ... gap, 110 ... cutter

Claims (13)

An optical element in which an optical member and a lens chip are laminated,
An optical element comprising a stepped portion on a side surface of the optical element.   The optical element according to claim 1, wherein the stepped portion is provided on at least one of the side surfaces of the optical member and the lens chip.   The optical element according to claim 1, wherein the stepped portion has a step of 0.01 to 1 mm.   The optical element according to any one of claims 1 to 3, wherein an outer periphery of the lens chip is a rough surface having a surface roughness Ra of 0.1 to 10 µm.   The optical element according to any one of claims 1 to 4, wherein an angle formed between a surface of the stepped portion and the side surface is an obtuse angle or a right angle at a connection portion between the stepped portion and the side surface.   The optical element according to claim 1, further comprising an adhesive layer between the optical member and the lens chip.   The optical element according to claim 6, further comprising an antireflection film between the adhesive layer and the optical member.   The optical element according to claim 1, wherein the optical member has a prism shape.   The optical element according to claim 8, wherein the optical member includes the stepped portion on a light incident / exit surface on a side where the lens chip is not laminated.   The optical element according to claim 8, wherein the optical member includes the stepped portion on a side surface orthogonal to a surface on which the lens chips are stacked.   The optical element according to claim 1, wherein the lens chip includes a light shielding film that transmits light at a center of the lens and shields light at an outer periphery.   The adhesive agent is provided between the lens chip and the optical member, and the difference between the refractive index of the adhesive and the refractive index of the lens chip is within 0.4. An optical element according to 1. The optical element according to any one of claims 1 to 12, and a holder for holding the optical element,
An optical device comprising an adhesive in a space formed by an inner surface of the holder and a stepped portion of the optical element.

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