JP2020086251A - Lens unit and manufacturing method therefor - Google Patents

Abstract

To provide a lens unit which has a simple configuration and is capable of suppressing optical axis misalignment of lenses.SOLUTION: A lens unit 100 is provided, comprising at least one lens 110, a lens holder 150 having at least one through-hole 11 reaching a side face of the lens 110, and an adhesive 160 adhered to an inner peripheral wall defining the side face and the through hole.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a lens unit and a method for manufacturing a lens unit.

Conventionally, the outer peripheral part of one surface of the optical lens is supported by the support part of the cylindrical lens holder, and the outer peripheral part of the other surface of the optical lens is pressed by the lens retainer to simplify the lens focus position adjustment mechanism. Known optical lens units are known (for example, refer to Patent Document 1).

Further, there is known a lens unit in which a plurality of lenses are fixed to a lens holder with an adhesive and the optical axes of the plurality of lenses are aligned.

JP-A-2002-98878

However, the conventional configuration has a problem in that the adhesive must be applied to the upper surface or the lower surface of each lens each time each lens is housed in the lens holder, which lengthens the manufacturing process time. In addition, the conventional configuration is vulnerable to vibration or heat, and there is also a problem that the optical axis of each lens is easily displaced.

An object of the present invention made in view of the above problems is to provide a lens unit that can suppress the optical axis shift of a lens with a simple structure, and a method for manufacturing the lens unit. ..

A lens unit according to an embodiment of the present disclosure is
At least one lens,
A lens holder having at least one through hole reaching a side surface of the lens;
An adhesive that adheres to the inner peripheral wall that defines the side surface and the through hole,
Equipped with.

A method of manufacturing a lens unit according to an embodiment of the present disclosure,
A step of inserting a lens into a lens holder having a through hole,
Aligning the position of the lens in the optical axis direction with the position of the through hole,
Injecting an adhesive from the through hole to the side surface of the lens,
Curing the adhesive,
including.

According to the embodiment of the present disclosure, it is possible to suppress the deviation of the optical axis of the lens while having a simple configuration.

It is sectional drawing which shows an example of a structure of the lens unit which concerns on 1st Embodiment. It is an enlarged view which shows the through-hole vicinity of the lens unit shown in FIG. It is a front view showing an example of composition of a lens unit concerning a 1st embodiment. It is sectional drawing which shows an example of a structure of the lens unit which concerns on 2nd Embodiment. It is an enlarged view which shows the through-hole vicinity of the lens unit shown in FIG. It is sectional drawing which shows an example of a structure of the lens unit which concerns on 3rd Embodiment. It is an enlarged view which shows the through-hole vicinity of the lens unit shown in FIG. It is sectional drawing which shows an example of a structure of the lens unit which concerns on 4th Embodiment. It is an enlarged view which shows the through-hole vicinity of the lens unit shown in FIG. It is a graph which shows an example of the verification result of the optical axis variation of the lens after a reliability test. It is sectional drawing which shows an example of the manufacturing method of the lens unit which concerns on this embodiment. It is sectional drawing which shows an example of the manufacturing method of the lens unit which concerns on this embodiment. It is sectional drawing which shows an example of the manufacturing method of the lens unit which concerns on this embodiment. It is sectional drawing which shows an example of the manufacturing method of the lens unit which concerns on this embodiment. It is sectional drawing which shows an example of a structure of the lens unit which concerns on a prior art example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the drawings used in the following description are schematic. The dimensional ratios in the drawings do not always match the actual ones.

<First Embodiment>
The configuration of the lens unit according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a sectional view taken along the optical axis showing an example of the configuration of the lens unit according to the first embodiment. FIG. 2 is an enlarged view showing the vicinity of the through hole of the lens unit shown in FIG. FIG. 3 is a front view showing an example of the configuration of the lens unit according to the first embodiment.

The lens unit 100 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a lens holder 150, an adhesive 160, a first spacer 171, and a second spacer 172. , A third spacer 173 and an image sensor 180. The lens holder 150 has a through hole 11, a through hole 12, and a through hole 13. Hereinafter, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the first spacer 171, the second spacer 172, the third spacer 173, etc. may be collectively referred to as an optical member. Further, in the optical member, a surface parallel to the optical axis L may be referred to as a side surface of the optical member. Here, “parallel” means not only being completely parallel but also being substantially parallel, for example, including an error of about several percent.

The image sensor 180 includes, for example, a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor. A plurality of pixels are arranged on the light receiving surface of the image sensor 180. The image pickup element 180 picks up a subject image formed on the light receiving surface to generate a picked-up image. In FIG. 1, the side on which the image pickup element 180 is provided is indicated by “image side X”, and the side opposite to the side on which the image pickup element 180 is provided is indicated by “object side Y”.

The first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 are the first lens 110, the second lens 120, the third lens 130, and the third lens 130, from the object side Y to the image side X. The four lenses 140 are arranged in this order. In FIG. 1, the case where the number of lenses arranged in the lens unit 100 is four is described as an example, but the number of lenses is not particularly limited. The order in which the lenses are arranged is not particularly limited.

The first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 refract light that has entered the lens unit 100 and transmit it from the object side Y to the image side X. In addition, the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 form a subject image on the image sensor 180.

The first lens 110 is, for example, a plano-concave lens. The first lens 110 includes a flange portion 111 on the outer side in the radial direction. The second lens 120 is, for example, a biconcave lens. The second lens 120 includes a flange portion 121 on the radially outer side. The third lens 130 is, for example, a biconvex lens. The third lens 130 includes a flange portion 131 on the radially outer side. The fourth lens 140 is, for example, a meniscus lens. The fourth lens 140 includes a flange portion 141 on the radially outer side. Note that the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 are not limited to these shapes and can have various shapes.

The first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 are formed of a light-transmitting material such as glass or resin.

Each of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 may have a light blocking portion on which a light blocking material is applied. Since each lens has a light-shielding portion to which a light-shielding material is applied on the side surface of each lens, it is possible to prevent unnecessary light from entering the inside of the lens unit 100 through the through hole 11, the through hole 12, and the through hole 13. Can be reduced. Accordingly, in the lens unit 100, it is possible to reduce a phenomenon such as a ghost or a flare that occurs when unnecessary light is reflected inside the lens unit 100. In addition, the side surface of each lens may be subjected to surface treatment or the like for increasing the adhesion to the adhesive 160.

The lens holder 150 has, for example, a cylindrical shape and holds the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140. Further, the lens holder 150 has a plurality of through holes. The plurality of through holes extend, for example, perpendicularly to the axis of the lens holder 150 or the optical axis of the first lens 110 or the like. Further, the plurality of through holes extend, for example, in the radial direction of the lens holder 150.

As shown in FIG. 1, the lens holder 150 has a plurality of through holes along the optical axis direction, for example. The plurality of through holes may be provided at different intervals or may be provided at equal intervals along the optical axis direction depending on the position of each lens. In addition, the number of the plurality of through holes provided along the optical axis direction is not particularly limited. For example, one through hole may be provided corresponding to two optical members. By providing one through-hole corresponding to the two optical members, the number of through-holes manufactured in the lens holder 150 can be reduced, so that the manufacturing process can be simplified. Further, the smaller the number of through holes, the higher the mechanical strength of the lens holder 150.

As shown in FIG. 3, the lens holder 150 has a plurality of through holes along the circumferential direction, for example, at each position where the through holes are provided in the optical axis direction. The plurality of through holes may be provided at different intervals along the circumferential direction, or may be provided at equal intervals. Further, the number of the plurality of through holes provided along the circumferential direction is not particularly limited. For example, three through holes may be provided along the circumferential direction. In the case where three through holes are provided along the circumferential direction of the lens holder 150, compared with the case where one or two through holes are provided along the circumferential direction of the lens holder 150, The holding strength of the member can be increased.

Further, the lens holder 150 has a through hole that reaches the side surface of the optical member. For example, the lens holder 150 has the through hole 11 that reaches the side surface of the first lens 110 and the side surface of the second lens 120. For example, the lens holder 150 has the through hole 12 that reaches the side surface of the third lens 130. For example, the lens holder 150 has the through hole 13 that reaches the side surface of the second spacer 172 and the side surface of the fourth lens 140. Since the lens holder 150 has the through hole that reaches the side surface of the optical member, it becomes possible to directly inject the adhesive 160 from the through hole toward the side surface of the optical member.

The dimensional tolerance between the side surface of the optical member and the inner peripheral surface of the lens holder 150 is preferably about ±0.1 _mm . As a result, it is possible to prevent unwanted adhesive 160 from entering between the side surface of the optical member and the inner peripheral surface of the lens holder 150.

The lens holder 150 is formed of, for example, a resin material filled with an inorganic reinforcing fiber such as glass fiber, or a metal material such as aluminum unimu and brass. For example, when the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 are made of plastic, the lens holder 150 is preferably made of metal.

The adhesive 160 contacts the side surface of the optical member and the lens holder 150 via the through hole. The adhesive 160 is injected from the through hole toward the side surface of the optical member and is solidified to fix the optical member to the lens holder 150. The adhesive 160 may be in contact with the side surfaces of the plurality of optical members via the through holes, or may be in contact with the side surfaces of the single optical member via the through holes.

For example, the adhesive 160 is injected from the through hole 11 toward the side surface of the first lens 110 and the side surface of the second lens 120 and is solidified, so that the first lens 110 and the second lens 120 and the lens holder 150. Fix and. The solidified adhesive 160 contacts at least a part of the side surface of the first lens 110, at least a part of the side surface of the second lens 120, and a part of the inner peripheral surface of the through hole 11 in the lens holder 150.

For example, the adhesive 160 is injected from the through hole 12 toward the side surface of the third lens 130 and solidifies to fix the third lens 130 and the lens holder 150. The solidified adhesive 160 contacts at least a part of the side surface of the third lens 130 and a part of the inner peripheral surface of the through hole 12 in the lens holder 150.

For example, the adhesive 160 is injected from the through hole 13 toward the side surface of the second spacer 172 and the side surface of the fourth lens 140 and is solidified, so that the second spacer 172 and the fourth lens 140 and the lens holder 150 are formed. Fix and. The solidified adhesive 160 contacts at least a part of the side surface of the second spacer 172, at least a part of the side surface of the fourth lens 140, and a part of the inner peripheral surface of the through hole 13 in the lens holder 150.

The adhesive 160 injected and solidified from the through hole contacts at least a part of the side surface of the optical member and a part of the inner peripheral surface of the through hole in the lens holder 150 through the through hole, and The side surface and the lens holder 150 can be fixed. Thereby, even if the adhesive 160 thermally expands, each lens does not tilt, and the deviation of the optical axis of the lens can be suppressed. On the other hand, in the conventional configuration shown in FIG. 12, the adhesive 160A is applied between the first lens 110A and the second lens 120A, between the first spacer 171A and the third lens 130A, and between the second spacer 172A and the fourth lens 140A. It is provided between and. Therefore, for example, when the adhesive 160 thermally expands, there arises a problem that the optical axis of each lens is easily displaced, but the configuration according to the present embodiment can avoid such a problem.

The adhesive 160 is formed of a resin material such as an ultraviolet curable resin material, a thermosetting resin material, or a hybrid resin material. Examples of the resin material include acrylate resins and epoxy resins.

The adhesive 160 is preferably formed of a material having a viscosity of less than 15000 Pa·s, for example. As a result, it is possible to prevent unwanted adhesive 160 from entering between the side surface of the optical member and the inner peripheral surface of the lens holder 150.

The adhesive 160 is preferably formed of a material having a curing temperature lower than the glass transition temperature, for example. In addition, the adhesive 160 is preferably formed of a material having an elastic modulus after curing of 1000 MPa or more, for example. This makes it possible to firmly fix the optical member and the lens holder 150.

As shown in FIG. 2, in the region A of the through hole 11, the adhesive 160 is a part of the side surface of the R-shaped first lens 110 and a part of the side surface of the R-shaped second lens 120. Contact with. Part of the side surface of the first lens 110 facing the through hole 11 and part of the side surface of the second lens 120 facing the through hole 11 are R-shaped, so that the first lens 110 and the second lens 110 Between 120 and 120, an adhesive pool 161 is formed. As a result, the adhesion area between the first lens 110 and the second lens 120 and the lens holder 150 can be increased, so that each lens is firmly fixed to the lens holder 150 with the optical axis L of each lens aligned. It becomes possible to do.

In the region B of the through hole 12, the adhesive 160 contacts a part of the side surface of the third lens 130, which has a planar shape. Only the third lens 130 facing the through hole 12 is adhered by the adhesive 160, so that the third lens 130 can be formed in a state in which the optical axis L of the third lens 130 is aligned without forming an adhesion pool. It can be firmly fixed to the lens holder 150. The adhesive 160 may be in contact with not only a part of the side surface of the third lens 130 having a planar shape but also the entire side surface of the third lens 130 having a planar shape.

In the region C of the through hole 13, the adhesive 160 contacts a part of the side surface of the second spacer 172 having an R-plane shape and a part of the side surface of the fourth lens 140 having an R-plane shape. Part of the side surface of the second spacer 172 facing the through hole 13 and part of the side surface of the fourth lens 140 facing the through hole 13 are R-shaped, so that the second spacer 172 and the fourth lens An adhesive puddle 163 is formed between the adhesive puddle 140 and the adhesive pad 140. As a result, the adhesion area between the fourth lens 140 and the lens holder 150 can be increased, so that the fourth lens 140 is firmly fixed to the lens holder 150 with the optical axis L of the fourth lens 140 aligned. It becomes possible.

The first spacer 171, the second spacer 172, and the third spacer 173 are arranged in the order of the first spacer 171, the second spacer 172, and the third spacer 173 from the object side Y to the image side X. In FIG. 1, the case where the number of spacers arranged in the lens unit 100 is three is described as an example, but the number of spacers is not particularly limited.

Each of the first spacer 171, the second spacer 172, and the third spacer 173 has, for example, a hollow central portion, and has an annular shape having a predetermined length along the optical axis direction. For example, the first spacer 171 is provided between the flange portion 121 of the second lens 120 and the flange portion 131 of the third lens 130. The first spacer 171 defines the inter-plane distance between the second lens 120 and the third lens 130 along the optical axis direction. For example, the second spacer 172 is provided between the flange portion 131 of the third lens 130 and the flange portion 141 of the fourth lens 140. The second spacer 172 defines the inter-plane distance between the third lens 130 and the fourth lens 140 along the optical axis direction. For example, the third spacer 173 is provided between the flange portion 141 of the fourth lens 140 and the image sensor 180. The third spacer 173 defines an inter-plane distance between the fourth lens 140 and the image sensor 180 via the substrate along the optical axis direction.

According to the lens unit 100 of the present embodiment, at least one lens, the lens holder 150 having at least one through hole that reaches the side surface of the lens, and the adhesive agent that adheres to the inner peripheral wall that defines the side surface and the through hole. And Accordingly, it is possible to realize the lens unit 100 that has a simple configuration and that can suppress the deviation of the optical axis of the lens.

Further, according to the lens unit 100 according to the present embodiment, the adhesive 160A must be applied to the upper surface or the lower surface of each lens each time the lens is housed in the lens holder 150A, as in the conventional configuration shown in FIG. You don't have to do that. That is, the optical member and the lens holder 150 can be fixed only by injecting and curing the adhesive 160 from the through hole reaching the side surface of the optical member, so that the manufacturing process time can be shortened.

<Second Embodiment>
The configuration of the lens unit according to the second embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a cross-sectional view showing an example of the configuration of the lens unit according to the second embodiment. FIG. 5 is an enlarged view showing the vicinity of the through hole of the lens unit shown in FIG.

The lens unit 200 according to the second embodiment is different from the lens unit 100 according to the first embodiment in that a part of the side surface of the optical member in the lens unit 100 according to the first embodiment has an R surface shape. On the other hand, a part of the side surface of the optical member in the lens unit 200 according to the second embodiment is a pointed surface. Note that other configurations are the same as those of the lens unit 100 according to the first embodiment, and thus duplicated description will be omitted.

As shown in FIGS. 4 and 5, in the region A of the through hole 11, the adhesive 160 is a part of the side surface of the first lens 110 having the face-shape and the side surface of the second lens 120 having the face-shape. Contact with a part of. Part of the side surface of the first lens 110 facing the through hole 11 and part of the side surface of the second lens 120 facing the through hole 11 are scooped, so that the first lens 110 and the second lens Between 120 and 120, an adhesive pool 161K is formed. As a result, the adhesion area between the first lens 110 and the second lens 120 and the lens holder 150 can be increased, so that each lens is firmly fixed to the lens holder 150 with the optical axis L of each lens aligned. It becomes possible to do.

In addition, a part of the side surface of the first lens 110 facing the through hole 11 and a part of the side surface of the second lens 120 facing the through hole 11 are scooped, so that the first lens 110 and the first lens 110 The adhesive strength between the second lens 120 and the lens holder 150 can be increased. Thereby, even if vibration or heat is applied, the inclination of the first lens 110 and the second lens 120 can be suppressed.

Further, the face shape formed on a part of the side surface of the first lens 110 and a part of the side surface of the second lens 120 is relatively easy to specify the dimensions in the manufacturing process. Thereby, the manufacturing process can be simplified.

In the region C of the through hole 13, the adhesive 160 contacts a part of the side surface of the second spacer 172 having a face-shape and a part of the side surface of the fourth lens 140 having a face-shape. Part of the side surface of the second spacer 172 facing the through hole 13 and part of the side surface of the fourth lens 140 facing the through hole 13 are scooped, so that the second spacer 172 and the fourth lens An adhesive pool 163K is formed between the adhesive pool 143 and 140. As a result, the bonding area between the fourth lens 140 and the lens holder 150 can be increased, so that the fourth lens 140 can be firmly fixed to the lens holder 150 with the optical axis L of each lens aligned. Becomes

In addition, a part of the side surface of the second spacer 172 facing the through hole 13 and a part of the side surface of the fourth lens 140 facing the through hole 13 have a scoop shape, so that the second spacer 172 and the The adhesive strength between the 4-lens 140 and the lens holder 150 can be increased. Thereby, even if vibration or heat is applied, the inclination of the fourth lens 140 can be suppressed.

Further, the face shape formed on a part of the side surface of the second spacer 172 and a part of the side surface of the fourth lens 140 is relatively easy to specify the dimensions in the manufacturing process. Thereby, the manufacturing process can be simplified.

According to the lens unit 200 of the present embodiment, at least one lens, a lens holder having at least one through hole that reaches the side surface of the lens, and an adhesive that adheres to the inner peripheral wall that defines the side surface and the through hole. , Is provided. With this, it is possible to realize the lens unit 200 which has a simple structure and can suppress the optical axis shift of the lens.

<Third Embodiment>
The configuration of the lens unit according to the third embodiment will be described with reference to FIGS. 6 and 7. FIG. 6 is a cross-sectional view showing an example of the configuration of the lens unit according to the third embodiment. FIG. 7 is an enlarged view showing the vicinity of the through hole of the lens unit shown in FIG.

The lens unit 300 according to the third embodiment is different from the lens unit 100 according to the first embodiment in that a part of the side surface of the optical member in the lens unit 100 according to the first embodiment has an R-plane shape. On the other hand, a part of the side surface of the optical member in the lens unit 300 according to the third embodiment has a C-plane shape. Note that other configurations are the same as those of the lens unit 100 according to the first embodiment, and thus duplicated description will be omitted.

As shown in FIGS. 6 and 7, in the region A of the through hole 11, the adhesive 160 is a part of the side surface of the first lens 110 having the C-plane shape and the side surface of the second lens 120 having the C-plane shape. Contact with a part of. Part of the side surface of the first lens 110 facing the through hole 11 and part of the side surface of the second lens 120 facing the through hole 11 are C-shaped, so that the first lens 110 and the second lens 110 An adhesive reservoir 161L is formed between the adhesive reservoir 120 and 120. As a result, the adhesion area between the first lens 110 and the second lens 120 and the lens holder 150 can be increased, so that each lens is firmly fixed to the lens holder 150 with the optical axis L of each lens aligned. It becomes possible to do.

In addition, a part of the side surface of the first lens 110 facing the through hole 11 and a part of the side surface of the second lens 120 facing the through hole 11 are C-shaped, so that the first lens 110 and the first lens 110 The adhesive strength between the second lens 120 and the lens holder 150 can be increased. Thereby, even if vibration or heat is applied, the inclination of the first lens 110 and the second lens 120 can be suppressed.

Further, the C-plane shape formed on a part of the side surface of the first lens 110 and a part of the side surface of the second lens 120 is relatively easy to specify the dimensions in the manufacturing process. Thereby, the manufacturing process can be simplified.

In addition, a part of the side surface of the first lens 110 facing the through hole 11 and a part of the side surface of the second lens 120 facing the through hole 11 are C-shaped, so that the area A from the through hole 11 is formed. The adhesive 160 before curing easily flows. This makes it possible to easily form the adhesive reservoir 161L in the region A, which facilitates fixing the plurality of optical members to the lens holder 150.

In the region C of the through hole 13, the adhesive 160 contacts a part of the side surface of the second spacer 172 having a C-plane shape and a part of the side surface of the fourth lens 140 having a C-plane shape. Part of the side surface of the second spacer 172 facing the through hole 13 and part of the side surface of the fourth lens 140 facing the through hole 13 are C-shaped, so that the second spacer 172 and the fourth lens An adhesive reservoir 163L is formed between the adhesive reservoir 143 and the adhesive reservoir 140. As a result, the bonding area between the fourth lens 140 and the lens holder 150 can be increased, so that the fourth lens 140 can be firmly fixed to the lens holder 150 with the optical axis L of each lens aligned. Becomes

In addition, a part of the side surface of the second spacer 172 facing the through hole 13 and a part of the side surface of the fourth lens 140 facing the through hole 13 are C-shaped, so that the second spacer 172 and the second spacer 172 The adhesive strength between the 4-lens 140 and the lens holder 150 can be increased. Thereby, even if vibration or heat is applied, the inclination of the first lens 110 and the second lens 120 can be suppressed.

The C-plane shape formed on a part of the side surface of the second spacer 172 and a part of the side surface of the fourth lens 140 is relatively easy to specify the dimensions in the manufacturing process. Thereby, the manufacturing process can be simplified.

In addition, a part of the side surface of the first lens 110 facing the through hole 13 and a part of the side surface of the second lens 120 facing the through hole 13 are C-shaped, so that the area A from the through hole 13 is formed. The adhesive 160 before curing easily flows. This makes it possible to easily form the adhesive reservoir 163L in the region A, which facilitates fixing the plurality of optical members to the lens holder 150.

According to the lens unit 300 of the present embodiment, at least one lens, a lens holder having at least one through hole that reaches the side surface of the lens, and an adhesive that adheres to the inner peripheral wall that defines the side surface and the through hole. , Is provided. Accordingly, it is possible to realize the lens unit 300 that has a simple configuration and that can suppress the optical axis shift of the lens.

<Fourth Embodiment>
The configuration of the lens unit according to the fourth embodiment will be described with reference to FIGS. 8 and 9. FIG. 8 is a cross-sectional view showing an example of the configuration of the lens unit according to the fourth embodiment. FIG. 9 is an enlarged view showing the vicinity of the through hole of the lens unit shown in FIG.

The lens unit 400 according to the fourth embodiment is different from the lens unit 100 according to the first embodiment in that the lens unit 100 according to the first embodiment has one through hole and side surfaces of a plurality of optical members. The lens unit 400 according to the fourth embodiment does not include a region in which one through hole and side faces of a plurality of optical members face each other, while including a region in which they face each other. Note that other configurations are the same as those of the lens unit 100 according to the first embodiment, and thus duplicated description will be omitted.

As shown in FIG. 8, in the lens unit 400, one through hole is provided along the optical axis direction so as to correspond to one optical member.

For example, one through hole 11 is provided corresponding to the first lens 110. The adhesive 160 is injected from the through hole 11 toward the side surface of the first lens 110 and solidifies to fix the first lens 110 and the lens holder 150.

For example, one through hole 12 is provided corresponding to the second lens 120. The adhesive 160 is injected from the through hole 12 toward the side surface of the second lens 120 and is solidified to fix the second lens 120 and the lens holder 150.

For example, one through hole 13 is provided corresponding to the first spacer 171. The adhesive 160 is injected from the through hole 13 toward the side surface of the first spacer 171, and is solidified to fix the first spacer 171 and the lens holder 150.

For example, one through hole 14 is provided corresponding to the third lens 130. The adhesive 160 is injected from the through hole 14 toward the side surface of the third lens 130 and solidifies to fix the third lens 130 and the lens holder 150.

For example, one through hole 15 is provided corresponding to the second spacer 172. The adhesive 160 is injected from the through hole 15 toward the side surface of the second spacer 172 and solidifies to fix the second spacer 172 and the lens holder 150.

For example, one through hole 16 is provided corresponding to the fourth lens 140. The adhesive 160 is injected from the through hole 16 toward the side surface of the fourth lens 140 and solidifies to fix the fourth lens 140 and the lens holder 150.

For example, one through hole 17 is provided corresponding to the third spacer 173. The adhesive 160 is injected from the through hole 17 toward the side surface of the third spacer 173 and solidifies to fix the third spacer 173 and the lens holder 150.

As shown in FIG. 9, the adhesive 160 contacts a part of the side surface of the first lens 110 having a planar shape in the region A of the through hole 11. Only the first lens 110 facing the through hole 11 is adhered by the adhesive 160, so that the first lens 110 can be fixed in a state where the optical axis L of the first lens 110 is aligned without forming an adhesion pool. It can be firmly fixed to the lens holder 150. The adhesive 160 may contact not only a part of the side surface of the first lens 110 having a planar shape but also the entire side surface of the first lens 110 having a planar shape.

In the region C of the through hole 13, the adhesive 160 contacts a part of the side surface of the first spacer 171 having a planar shape. Only the first spacer 171 facing the through hole 13 is adhered by the adhesive 160, so that the first spacer 171 can be firmly fixed to the lens holder 150 without forming an adhesive pool. .. That is, by firmly fixing the first spacer 171 to the lens holder 150, it is possible to suppress the deviation of the optical axis L between the second lens 120 and the third lens 130 arranged on both sides of the first spacer 171. Becomes

It should be noted that in FIG. 9, a detailed description has been given by taking the region A as an example in which the lens is located near the through hole 11 and the region C as an example in which the spacer is located near the through hole 13 as an example. It is needless to say that the hole 14 and the through hole 16 can be described in the same manner as in the region A, and the through holes 15 and 17 can be described in the same manner as in the region C.

As described above, one through hole is provided corresponding to one optical member to form an R surface shape, a scoop surface shape, a C surface shape, or the like on a part of the side surface of the optical member. Instead, the optical member can be firmly fixed to the lens holder. That is, it is possible to firmly fix the optical member to the lens holder, although the structure is simpler than the structure in which one through hole is provided corresponding to the two optical members. Further, since one through hole is provided for one optical member, the optical member can be reliably fixed to the lens holder, so that the lens unit 400 having excellent environmental resistance can be realized.

According to the lens unit 400 according to the present embodiment, at least one lens, a lens holder having at least one through hole that reaches the side surface of the lens, and an adhesive that adheres to the inner peripheral wall that defines the side surface and the through hole. , Is provided. With this, it is possible to realize the lens unit 400 which has a simple configuration and can suppress the optical axis shift of the lens.

<Verification result>
〔Example〕
A reliability test was performed to verify the optical axis variation of the lens in the lens unit according to the present embodiment. FIG. 10 is a graph showing an example of the verification result of the optical axis variation of the lens after performing various reliability tests. The dotted line graph is a graph showing the verification result of the optical axis variation of the lens when an ultraviolet curable resin material is used as the adhesive 160. The solid line graph is a graph showing the verification result of the optical axis variation of the lens when the hybrid resin material is used as the adhesive 160.

As various reliability tests, a half-sine impact application test, a heat cycle test, an additional heat cycle test, and a sweep vibration test were performed. After performing these tests, the transmission eccentricity of the lens lens in the lens unit according to this embodiment was measured.

Details of the first resin material used for the adhesive 160 are shown below.
Main component: Modified acrylate resin Curing method: Ultraviolet ray Viscosity [mPa・s]: 12500
Curing shrinkage rate [%]: 4
Elastic modulus [MPa]: 1.4

Details of the second resin material used for the adhesive 160 are shown below.
Main component: Epoxy resin Curing method: UV + heat ray Viscosity [mPa・s]: 55000
Curing shrinkage rate [%]: 1.8
Elastic modulus [MPa]: 5000

In FIG. 10, P1 indicates the actual measurement value of the transmission decentering of the lens in the initial state. P2 shows the measured value of the transmission eccentricity of the lens after the half-sine impact application test. P3 indicates the actual measurement value of the transmission eccentricity of the lens after the heat cycle test is performed. P4 shows the measured value of the transmission eccentricity of the lens after the additional heat cycle test is performed. P5 indicates the actual measurement value of the transmission eccentricity of the lens after the sweep vibration test is performed.

From FIG. 10, when the above-mentioned first adhesive is used, the optical axis variation of the lens is suppressed to about −0.4 to +0.4 pixels even after performing various reliability tests. You can see that it is done.

From FIG. 10, when the above-mentioned second adhesive is used, the optical axis variation of the lens is suppressed to about −0.1 to +0.1 pixels even after performing various reliability tests. You can see that it is done.

That is, it was confirmed that the configuration of the lens unit according to the present embodiment can suppress the optical axis shift of the lens regardless of which adhesive is used. Further, even after performing various reliability tests, it was confirmed that the configuration of the lens unit according to the present embodiment is resistant to the optical axis shift of the lens.

<Lens unit manufacturing method>
Next, with reference to FIG. 11, a method of manufacturing the lens unit according to the present embodiment will be briefly described.

As shown in FIG. 11A, the lens is inserted into the lens holder 150 having the through hole. For example, in the lens holder 150, a plurality of lenses are arranged in the order of the first lens 110, the second lens 120, the third lens 130, and the fourth lens 140 from the object side Y to the image side X. , Insert each lens. In addition, a spacer is inserted between the lenses. For example, the first spacer 171 is inserted between the flange portion 121 of the second lens 120 and the flange portion 131 of the third lens 130. For example, the second spacer 172 is inserted between the flange portion 131 of the third lens 130 and the flange portion 141 of the fourth lens 140. For example, the third spacer 173 is inserted between the flange portion 141 of the fourth lens 140 and the image sensor 180.

Adjust the position of the lens as shown in FIG. 11B. That is, the first lens 110, the second lens 120, and the second lens 120 are aligned so that the optical axis of the first lens 110, the optical axis of the second lens 120, the optical axis of the third lens 130, and the optical axis of the fourth lens 140 are aligned. The positions of the third lens 130 and the fourth lens 140 are adjusted to predetermined positions.

For example, the positions of the first lens 110 and the second lens 120 are adjusted to predetermined positions so that the positions of the first lens 110 and the second lens 120 in the optical axis direction match the position of the through hole 11. That is, the positions of the first lens 110 and the second lens 120 are adjusted so that the through hole 11 faces at least a part of the side surface of the first lens 110 and at least a part of the side surface of the second lens 120. For example, the position of the third lens 130 is adjusted to a predetermined position so that the position of the third lens 130 in the optical axis direction matches the position of the through hole 12. That is, the position of the third lens 130 is adjusted so that the through hole 12 and at least a part of the side surface of the third lens 130 face each other. For example, the position of the fourth lens 140 is adjusted to a predetermined position so that the position of the fourth lens 140 in the optical axis direction matches the position of the through hole 13. That is, the position of the fourth lens 140 is adjusted so that the through hole 13 faces at least a part of the side surface of the second spacer 172 and at least a part of the side surface of the fourth lens 140.

As shown in FIG. 11C, using a dispenser or the like, the adhesive is needle-injected from the through hole to the side surface of the optical member so that the adhesive reaches the side surface of the optical member. For example, from the through hole 11 toward the side surface of the first lens 110 and the side surface of the second lens 120, an adhesive is applied to at least a part of the side surface of the first lens 110 and at least a part of the side surface of the second lens 120. Inject the adhesive 160 so that 160 reaches. For example, the adhesive 160 is injected from the through hole 12 toward the side surface of the third lens 130 so that the adhesive 160 reaches at least a part of the side surface of the third lens 130. For example, from the through hole 13 toward the side surface of the second spacer 172 and the side surface of the fourth lens 140, an adhesive is applied to at least a part of the side surface of the second spacer 172 and at least a part of the side surface of the fourth lens 140. Inject the adhesive 160 so that 160 reaches.

The adhesive is cured as shown in FIG. 11D. First, the needle is pulled out from the through hole, and the injection surface is irradiated with only ultraviolet rays, only heat rays, or ultraviolet rays and heat rays to temporarily cure the adhesive. For example, the injection surface of the adhesive 160 is irradiated with ultraviolet rays from the through hole 11, the through hole 12, and the through hole 13 to temporarily cure the adhesive.

Next, the lens unit is placed in a high-temperature dryer, and the temporarily cured adhesive is fully cured. For example, the adhesive 160 injected from the through hole 11 is fully cured to bond at least a part of the side surface of the first lens 110 and at least a part of the side surface of the second lens 120 to the lens holder 150. As a result, the first lens 110, the second lens 120, and the lens holder 150 are fixed. For example, the adhesive 160 injected from the through hole 12 is fully cured to bond at least a part of the side surface of the third lens 130 and the lens holder 150. As a result, the third lens 130 and the lens holder 150 are fixed. For example, the adhesive 160 injected from the through hole 13 is fully cured to bond at least a part of the side surface of the second spacer 172 and at least a part of the side surface of the fourth lens 140 to the lens holder 150. This fixes the second spacer 172 and the fourth lens 140 to the lens holder 150.

According to the method of manufacturing a lens unit according to the present embodiment, the lens is inserted into the lens holder having the through hole, and the adhesive is injected from the through hole to the side surface of the lens with the optical axis L of each lens aligned. And cure the adhesive. Accordingly, it is possible to realize a method of manufacturing a lens unit that has a simple configuration and that can suppress the deviation of the optical axis.

<Modification>
The lens unit according to this embodiment may be mounted on a moving body. The “moving body” in the present disclosure may include, for example, a vehicle, a ship, an aircraft, and the like. The “vehicle” in the present disclosure includes, but is not limited to, an automobile, a railroad vehicle, an industrial vehicle, and a living vehicle. For example, the vehicle may include an airplane traveling on a runway. Vehicles include, but are not limited to, passenger cars, trucks, buses, motorcycles, and trolleybuses, and may include other vehicles traveling on roads. Rail vehicles include, but are not limited to, locomotives, freight cars, passenger cars, trams, guided railroads, ropeways, cable cars, linear motor cars, and monorails, and may include other vehicles that travel along tracks. Industrial vehicles include industrial vehicles for agriculture and construction. Industrial vehicles include, but are not limited to, forklifts and golf carts. Industrial vehicles for agriculture include, but are not limited to, tractors, tillers, transplanters, binders, combines, and lawnmowers. Industrial vehicles for construction include, but are not limited to, bulldozers, scrapers, excavators, mobile cranes, dump trucks, and road rollers. Living vehicles include, but are not limited to, bicycles, wheelchairs, prams, wheelbarrows, and electric standing two-wheeled vehicles. Vehicle power engines include, but are not limited to, internal combustion engines including diesel engines, gasoline engines, and hydrogen engines, and electric engines including motors. Vehicles include those that are driven manually. The vehicle classification is not limited to the above. For example, an automobile may include an industrial vehicle that can travel on a road, and the same vehicle may be included in multiple classifications.

The lens unit according to this embodiment may include an optical filter that suppresses or shields light having a predetermined wavelength. The optical filter includes, for example, an infrared cut filter that suppresses infrared rays that pass therethrough.

In the present embodiment, the description such as “first” and “second” is an identifier for distinguishing the configuration. For the configurations distinguished by the description such as “first” and “second” in the present disclosure, the numbers in the configurations can be exchanged. For example, the first lens can replace the second lens with the identifiers "first" and "second". The exchange of identifiers is done simultaneously. Even after exchanging the identifiers, the configurations are distinguished. The identifier may be deleted. The configuration in which the identifier is deleted is distinguished by the code. Based on only the description of the identifiers such as “first” and “second” in the present disclosure, it should not be used as a basis for the interpretation of the order of the configuration and the existence of an identifier with a small number.

The diagram illustrating the configuration according to the present embodiment is schematic. Dimensional ratios in the drawings do not always match actual ones.

Although the above embodiments have been described as representative examples, it will be apparent to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of the present disclosure. The configuration according to the present disclosure should not be construed as being limited by the above-described embodiment, and various modifications or changes can be made without departing from the scope of the claims. The present invention is not limited to the example of the embodiment described above, and various modifications such as numerical values are possible. The various combinations of the characteristic portions in this embodiment are not limited to the examples of the above-described embodiment.

11 Through Hole 12 Through Hole 13 Through Hole 100 Lens Unit 110 First Lens 120 Second Lens 130 Third Lens 140 Fourth Lens 150 Lens Holder 160 Adhesive 171 First Spacer 172 Second Spacer 173 Third Spacer 180 Imaging Device

Claims (11)

At least one lens,
A lens holder having at least one through hole reaching a side surface of the lens;
An adhesive that adheres to the inner peripheral wall that defines the side surface and the through hole,
A lens unit equipped with. The lens is a plurality,
The lens unit according to claim 1. The adhesive adheres to at least two side surfaces of the lens in at least one of the through holes,
The lens unit according to claim 1. Further comprising at least one spacer for fixing the lens in the optical axis direction,
The adhesive contacts the side surface of at least one of the lenses and the side surface of the spacer through the through hole.
The lens unit according to claim 1. A part of the side surface of the lens facing the through hole has a C-plane shape,
The lens unit according to claim 1. A part of the side surface of the lens facing the through hole has an R surface shape,
The lens unit according to claim 1. A part of the side surface of the lens facing the through hole has a face shape.
The lens unit according to claim 1. The lens holder is
It has a cylindrical shape and has a plurality of through holes,
The lens unit according to claim 1. The through holes are located at equal intervals along the circumferential direction,
The lens unit according to claim 8. The side surface has a light shielding portion,
The lens unit according to claim 1. A step of inserting a lens into a lens holder having a through hole,
Aligning the position of the lens in the optical axis direction with the position of the through hole,
Injecting an adhesive from the through hole to the side surface of the lens,
Curing the adhesive,
A method of manufacturing a lens unit including:

Images