JP2016080718A - Method for manufacturing optical member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy method for masking with an accurate boundary line.SOLUTION: A method for manufacturing an optical member is provided, which comprises disposing an antireflection layer on a substrate. The substrate has a recessed part, a groove, or a projection between a part where an antireflection layer is to be disposed and a part where an antireflection layer is not to be formed, for preventing adhesion of a resist film in the part where an antireflection layer is to be formed. In the method for manufacturing an optical member, a resist film is formed on the part where an antireflection layer is not to be formed, the substrate with the resist film formed thereon is subjected to an antireflection treatment, and then the resist film is removed.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a method for manufacturing an optical member such as a lens barrel used in an optical apparatus such as a camera or a microscope.

  An optical member such as a lens holding an optical element such as a photographing lens or a prism, or a lens barrel of an optical device such as a microscope is generally subjected to an antireflection treatment on the inner wall surface, thereby deviating from the optical path of the optical system. Suppresses the reflection of light and suppresses the generation of ghosts and flares. Various proposals have been made to suppress reflection of light deviating from the optical path in the lens barrel.

  When the antireflection treatment is performed on the inner wall surface, masking is performed on a portion where the antireflection treatment is not performed, so that the antireflection treatment can be selectively performed on the portion on the inner wall surface where the antireflection layer is provided. Examples of the masking method include a method of sticking a resin adhesive tape and a method of attaching a masking jig. However, it is difficult to apply an adhesive tape to a narrow place such as the inner wall of a camera barrel or small parts accurately. In the method using the masking jig, accurate dimensional accuracy and adhesion are required, so that the jig becomes expensive and it is difficult to completely prevent the resist agent from entering.

  JP-A-2010-186157 (Patent Document 1) discloses that the surface of the lens frame member is masked on a surface other than the antireflection surface forming surface, and the surface of the lens frame member is not masked. A surface processing method of a lens frame member is disclosed in which masking is removed after performing antireflection treatment. However, with this method, it is difficult to perform masking so that the resist agent does not adhere to the surface subjected to the antireflection treatment.

JP 2010-186157 A

  Accordingly, an object of the present invention is to provide a method for producing an optical member having an antireflection layer while easily distinguishing a portion where an antireflection layer is provided from a portion where no antireflection layer is provided.

  As a result of intensive studies in view of the above problems, the present inventors have found that the resist film adheres to the portion where the antireflection layer is provided between the portion where the antireflection layer is provided and the portion where the antireflection layer is not provided. It was discovered that an optical member provided with an antireflection layer can be easily produced by performing masking and antireflection treatment using a base material having a recess, groove or protrusion for preventing the present invention. I came up with it.

  An optical member manufacturing method according to an embodiment of the present invention is a method of manufacturing an optical member by providing an antireflection layer on a base material, wherein the base material includes a portion on which the antireflection layer is provided and the reflective surface. There is a recess, groove or protrusion for preventing the resist film from adhering to the portion where the antireflection layer is provided between the portion where the antireflection layer is not provided, and the antireflection layer is not provided A resist film is formed on the portion, and the substrate on which the resist film is formed is subjected to an antireflection treatment, and then the resist film is removed.

  In the antireflection treatment, it is preferable that the base material is subjected to a plating treatment, or the etching treatment is performed after the plating treatment.

  The substrate is preferably a lens barrel or at least one internal ring of an optical element support frame, a spacing ring, and a pressing ring of the lens barrel, and the recess, the groove, or the protrusion is preferably annular.

  The antireflection layer preferably has a large number of minute protrusions having a height of 0.5 to 20 μm, which are randomly formed at a pitch of 0.1 to 30 μm.

  It is preferable that the antireflection layer is not provided in a portion in contact with the other base material of the base material, the other base material is preferably a lens, and the protrusion is preferably in contact with the lens. . It is preferable that the concave portion is provided at at least one end of a portion of the base material that contacts the other base material.

  According to the present invention, the concave portion, the groove portion, or the groove portion for preventing the resist film from adhering to the portion where the antireflection layer is provided between the portion where the antireflection layer is provided and the portion where the antireflection layer is not provided. By performing masking and antireflection treatment using a substrate having a protrusion, an optical member having an antireflection layer can be easily produced.

It is a longitudinal cross-sectional view which shows the example which mounted | wore the lens barrel which has an antireflection layer. It is a longitudinal cross-sectional view which shows an example of a space | interval ring. It is a figure which shows the method of forming an antireflection layer in the space | interval ring of FIG. It is a figure which shows the space | interval ring which has an antireflection layer. It is a longitudinal cross-sectional view which shows another example of a space | interval ring. It is a longitudinal cross-sectional view which shows another example of a space | interval ring. It is a figure which shows the method of forming an antireflection layer in the space | interval ring of FIG. It is a figure which shows the space | interval ring which has an antireflection layer. It is a longitudinal cross-sectional view which shows another example of a space | interval ring. It is a figure which shows the method of forming an antireflection layer in the space | interval ring of FIG. It is a figure which shows the space | interval ring which has an antireflection layer. It is a longitudinal cross-sectional view which shows an example of an inner flange. FIG. 13 is a view showing a method of forming an antireflection layer on the inner flange of FIG. It is a figure which shows the inner flange which has an antireflection layer. It is a longitudinal cross-sectional view which shows an example of a 1st pressing ring. FIG. 15 is a diagram showing a method of forming an antireflection layer on the first pressing ring of FIG. It is a figure which shows the 1st pressing ring which has an antireflection layer.

  The method for producing an optical member of the present invention can be suitably used for a base material composed of a lens barrel or an optical element support frame of the lens barrel, a spacing ring, and an inner ring of a pressing ring. Therefore, the optical member manufacturing method of the present invention will be described in detail below with reference to the accompanying drawings using a lens barrel and an inner ring as a base material. However, the present invention is not limited to them. The description regarding each embodiment is applicable also to other embodiment unless there is particular notice.

[1] Conventional barrel FIG. 1 shows an example of a conventional barrel and an inner ring in which an antireflection layer is formed. The conventional general lens barrel and the inner ring and the antireflection layer provided on the surface thereof will be described, and each embodiment of the present invention will be described in detail with reference to FIG. For the sake of explanation, FIG. 1 shows a lens supported by a lens barrel. In the following description, the left side of FIG. 1 is “front” and the right side is “rear”.

  The lens barrel 1 shown in FIG. 1 is integrally provided with an inward flange 12 projecting radially inward at an intermediate portion, a female screw portion 110 is formed on the front inner peripheral surface, and a male screw portion 120 is formed on the rear outer peripheral surface. Formed on the outer peripheral surface of the barrel main body 10 formed with the male screw portion 110 to be engaged with the female screw portion 110 of the barrel main body 10, and provided to project forward inward in the radial direction. A spacing ring 14 having an inner flange 40 and a second pressing ring 15 having a male threaded portion 150 screwed with a female threaded portion 120 of the lens barrel body 10 on the outer peripheral surface are provided. The lens barrel body 10, the first pressing ring 13, the spacing ring 14 and the second pressing ring 15 are concentric with the optical axis O as the center.

  As shown in FIG. 1, a first lens L1, a second lens L2, and a third lens, which are made of resin or glass, are colorless and transparent, and have a rotationally symmetric shape about the optical axis O, as shown in FIG. L3 can be installed.

  The front end edge of the first lens L1 is in contact with the rear surface of the first pressing ring 13, and the rear end edge is in contact with the front surface of the inner flange 12. In the second lens L2, the front end edge is in contact with the rear surface of the inner flange 12, and the rear end edge is in contact with the front surface of the spacing ring. In the third lens L3, the front end edge is in contact with the rear surface of the spacing ring 14, and the rear end edge is in contact with the front surface of the second pressing ring 15.

  Of the inner wall surfaces of the inner flange 12, the first pressing ring 13, and the spacing ring 14 of the lens barrel body 10, antireflection layers are provided on the surfaces that require antireflection, respectively. That is, in the example shown in FIG. 1, the antireflection layers 12a and 12b are provided on the inner peripheral surface, the front surface, and the rear surface of the inner flange 12 at portions not in contact with the first lens L1 and the second lens L2. The antireflection layer 13a is provided on the inner peripheral surface of the first pressing ring 13 and the portion of the front surface that is not in contact with the first lens L1, and the second inner surface, front surface, and rear surface of the spacing ring 14 are provided. Antireflection layers 14a and 14b are provided in portions not in contact with the lens L2 and the third lens L3. The antireflection layer of the lens barrel 1 provides the most antireflection effect as long as it is provided on all parts except the surface that fits the lens and each member, but is provided at least in a region sandwiched between optical elements such as a lens. It is desirable.

  In the example of FIG. 1, the inner flange 12, the first pressing ring 13, and the spacing ring 14 are provided. However, the place where the antireflection layer is provided is not limited thereto, and can be attached to any part of the lens frame member. For example, the inner wall surface is not limited to a cylindrical shape as long as it is a member through which the optical path passes, and the antireflection layer is also applied to the wall surface in the mirror box in the camera body and the non-cylindrical wall surface such as the wall surface of the finder optical path. Can be provided. Further, the lens barrel provided with the antireflection layer is not limited to the camera, and can be attached to the microscope barrel.

  The material of the lens barrel is not particularly limited, but is preferably made of aluminum or an alloy containing aluminum as a main component. In order to further enhance the antireflection effect, it is preferable that the inner wall surface of the lens barrel is subjected to an alumite treatment or a black alumite treatment. The configuration of the lens barrel is not limited to that shown in FIG. 1, and various configurations can be adopted as long as they support and position the optical element. For example, the lens barrel may have an interval ring that adjusts the interval between optical elements such as lenses, or an internal ring such as an optical element support frame that is attached in the lens barrel and installs the optical elements.

[2] Manufacturing method of optical element
(1) Interval Ring FIG. 2 shows an example of the interval ring 24 used in the present invention. The spacing ring 24 shown in FIG. 2 is provided with annular recesses 242 and 242 at both ends of the outer peripheral surface 241.

  FIG. 3 shows a process of forming the antireflection layer 24a other than the outer peripheral surface of the spacing ring 24. By providing the antireflection layer 24a other than the outer peripheral surface of the spacing ring 24, the spacing ring 24 can be provided with an antireflection effect. FIG. 3 (1) shows a half sectional view of the spacing ring 24 shown in FIG. 2, and the recesses 242 and 242 shown in FIG. 3 (1) are annularly formed along the outer peripheral surface of the spacing ring 24. The same applies to the subsequent drawings.

  A resist agent is applied to the outer peripheral surface 241 of the spacing ring 24 and dried to form a resist film 24b (FIG. 3 (2)). The resist agent is preferably applied with a brush, a brush, or the like so that the masking agent does not adhere to other than the outer peripheral surface of the spacing ring 24. Although a resist agent is not specifically limited, The thing etc. which are used suitably for a plating process are mentioned.

  When applying the resist agent to the outer peripheral surface 241 of the spacing ring 24, even if the resist agent slightly protrudes from the outer peripheral surface 241, the resist agent hangs down into the recesses 242 and 242 provided at both ends. It never reaches the side. That is, by providing the recesses 242 and 242 at both ends of the outer peripheral surface 241 of the spacing ring 24, it is possible to prevent the resist film 24b from adhering to the side surfaces of the spacing ring 24.

  By performing a plating process such as nickel plating or nickel alloy plating on the spacing ring 24, an antireflection layer 24a is formed on the inner peripheral surface and both side surfaces of the spacing ring 24 (FIG. 3 (3)). Since the resist film 24b is not formed on the inner peripheral surface and both side surfaces of the spacing ring 24, the antireflection layer 24a can be reliably formed on the inner peripheral surface and both side surfaces of the spacing ring 14. The thickness of the antireflection layer 24a is preferably 3 to 90 μm. The thickness of the antireflection layer described below may be the same as that of the antireflection layer 24a.

  The antireflection layer 24a of the spacing ring 24 may be etched. As a result, a large number of minute protrusions are randomly formed on the antireflection layer 24a of the spacing ring 24. The height of the microprotrusions is preferably 0.5 to 20 μm, and the pitch is preferably 0.1 to 30 μm. This etching process is performed by, for example, nitric acid (nitric acid etching). The etching process may be performed before the resist film 24b is removed, or may be performed after the resist film 24b is removed. In addition, when the height and pitch of the minute protrusions of the antireflection layer 24a before the etching treatment are included in the above numerical range, this etching step may be omitted. As described above, by providing a fine concavo-convex structure in which a large number of minute protrusions are formed in a random arrangement on the surface of the member, an antireflection effect can be obtained with respect to visible light wavelengths. Refer to Japanese Patent Application Laid-Open No. 2010-186157 for an explanation of the antireflection characteristics by the fine uneven structure.

  By removing the resist film 24b, the spacing ring 24 having the antireflection layer 14a provided on the inner peripheral surface and both side surfaces is obtained (FIG. 3 (4)). The removal of the resist film 24b is performed, for example, by immersing the spacing ring 24 in a resist remover to remove the resist film 24b and then washing with pure water.

  FIG. 5 shows an example in which the interval ring 24 provided with the antireflection layer 24a is installed in the barrel main body 10 and the second lens L2 and the third lens L3 are attached. As shown in FIG. 5, the antireflection layer 24 a is not provided on the outer peripheral surface 241 of the spacing ring 24 in contact with the inner peripheral surface of the barrel body 10. The antireflection layer 24a may also be formed in a part of the recesses 242 and 242 as shown in FIG. 3 (4). Since the recesses 242 and 242 do not contact the lens barrel body 10, the antireflection layer is not destroyed by sliding contact with the lens barrel body 10, and the gap between the recesses 242 and 242 and the lens barrel body 10 is not broken. By capturing the light, reflection of the light at that portion can be suppressed.

  In the embodiment described with reference to FIGS. 3 and 4, the antireflection layer 24a is provided on the part of the spacing ring 24 in contact with the second lens L2 and the third lens L3, but the second lens L2 and the third lens L3 are provided. An example of an interval ring in which an antireflection layer is not provided in a portion in contact with the lens L3 will be described below.

  FIG. 5 shows another example of the spacing ring 34 used in the present invention. The spacing ring 34 shown in FIG. 5 is provided with annular grooves 342 and 342 at both ends of the outer peripheral surface 341. Similar to the spacing ring 24 in FIGS. 2 and 3, a resist agent is applied only to the outer peripheral surface 341 of the spacing ring 34. When a resist agent is applied to the outer peripheral surface 341 of the spacing ring 34, even if the resist agent slightly protrudes from the outer peripheral surface 341, the resist agent drips into the groove portions 342 and 342 provided at both end portions, so that the groove portions 342 and 342 The resist agent is supplemented, and the resist agent does not reach the side surface of the spacing ring 34. That is, by providing the annular grooves 342 and 342 at both ends of the outer peripheral surface 341 of the spacing ring 34, it is possible to prevent the resist agent from adhering to the side surfaces of the spacing ring 34.

  FIG. 6 shows still another example of the spacing ring used in the present invention. 6 is provided on the outer peripheral surface side of the front surface 443, the annular recess 451 provided on the rear end of the outer peripheral surface 441, the annular groove portion 452 provided on the inner peripheral surface side of the rear surface 442. An annular groove portion 453 and an annular protrusion 454 provided at the rear end of the inner peripheral surface 444.

  FIG. 7 shows a process of forming the antireflection layers 44 a and 44 b other than the outer peripheral surface of the spacing ring 44. FIG. 7 (1) is a half sectional view of the spacing ring 44 shown in FIG. A resist agent is applied to the outer peripheral surface side portion 4431 of the outer peripheral surface 441 and the front surface 443 of the spacing ring 44, and the inner peripheral surface side portion 4422 and the rear surface side of the projection 454 of the rear surface 442, and dried to form a resist film 44c, 44d is formed (FIG. 7 (2)). The application of the resist agent and the resist film may be the same as described above.

  When applying the resist agent to the spacing ring 44, since the groove portion 453 is provided between the outer peripheral surface side portion 4431 and the inner peripheral surface side portion 4432 of the front surface 443, the resist agent applied to the outer peripheral surface side portion 4431 is It is supplemented by the groove portion 453 and can be prevented from flowing into the inner peripheral surface side portion 4432. Further, since a groove 452 is provided between the inner peripheral surface side portion 4422 and the outer peripheral surface side portion 4421 of the rear surface 442, the resist agent applied to the inner peripheral surface side portion 4422 is supplemented by the groove portion 452, and the outer peripheral surface side. Flowing into the portion 4421 can be prevented. In addition, the provision of the protrusion 454 can prevent the resist agent applied to the inner peripheral surface side portion 4422 from flowing into the inner peripheral surface 344.

  Similar to FIGS. 3 (3) and (4), after the anti-reflection treatment is applied to the spacing ring 44, the resist films 44c and 44d are removed, so that the inner peripheral surface side portion 4432 and the inner peripheral surface 444 of the front surface 443 are removed. An antireflection layer 44a is formed, and an interval ring 44 is obtained in which an antireflection layer 44b is formed on the outer peripheral surface side portion 4421 of the rear surface 442.

  FIG. 8 shows an example in which the spacing ring 44 provided with the antireflection layers 44a and 44b is installed in the lens barrel body 10, and the second lens L2 and the third lens L3 are attached. As shown in FIG. 8, the outer peripheral surface 441 of the spacing ring 44 in contact with the inner peripheral surface of the lens barrel body 10 is not provided with an antireflection layer, and is in contact with the second lens L2 and the third lens L3. Also, no antireflection layer is provided. Therefore, while the antireflection layers 44a and 44b provide a sufficient antireflection effect, the antireflection layer is destroyed by contact with the lens barrel body or the lens, and the fragments adhere to the lens or other parts as powder. Can be prevented.

  FIG. 9 shows still another example of the spacing ring used in the present invention. 9 includes an annular recess 551 provided at the rear end of the outer peripheral surface 541, an annular protrusion 552 provided at the inner peripheral surface end of the rear surface 542, and an outer periphery of the front surface 543. An annular protrusion 553 provided at the end on the surface side and an annular protrusion 554 provided at the rear end of the inner peripheral surface 544 are provided.

  FIG. 10 shows a process of forming the antireflection layers 54a and 54b other than the outer peripheral surface of the spacing ring 54. FIG. 10 (1) is a half sectional view of the spacing ring 54 shown in FIG. Resist films 54c and 54d are formed by applying a resist agent to the front surface side of the outer peripheral surface 541 of the spacing ring 54 and the protrusion 553 of the front surface 543 and the rear surface side and inner peripheral surface of the protrusion 552 of the rear surface 542 and drying. (FIG. 10 (2)). The application of the resist agent and the resist film may be the same as described above.

  When applying the resist agent to the spacing ring 54, the protrusion 553 is provided between the outer peripheral surface 541 and the front surface 543, so that the resist agent applied to the outer peripheral surface 541 can be prevented from flowing into the front surface 543. it can. Further, since the concave portion 551 is provided at the rear end of the outer peripheral surface 541, the resist agent applied to the outer peripheral surface 541 can only flow into a part of the concave portion 551 and can be prevented from flowing into the rear surface 542. In addition, by providing the rear end protrusion 554 of the inner peripheral surface 544, the resist agent applied to the protrusion 552 can be prevented from flowing into the inner peripheral surface 544.

  Similar to FIGS. 3 (3) and (4), after the antireflection treatment is applied to the spacing ring 54, the resist films 54c and 54d are removed, whereby the antireflection layer 54a is formed on the front surface 543 and the inner peripheral surface 544. Thus, the spacing ring 54 in which the antireflection layer 54b is formed on the rear surface 542 is obtained. The antireflection layer 54a may be formed on a part of the protrusion 553 on the front surface 543 and the protrusion 554 on the inner peripheral surface 544, and the antireflection layer 54b is formed on the recess 551 on the outer peripheral surface 541 and the protrusion on the rear surface 542. It may also be formed on part of 552.

  FIG. 11 shows an example in which the interval ring 54 provided with the antireflection layers 54a and 54b is installed in the lens barrel body 10, and the second lens L2 and the third lens L3 are attached. As shown in FIG. 11, the second lens L2 is in contact with the front surface of the protrusion 553 of the spacing ring 54, and the third lens L3 is in contact with the rear surface of the protrusion 552. No antireflection layer is provided on the outer peripheral surface 541 of the spacing ring 54 in contact with the inner peripheral surface of the lens barrel body 10, and an antireflection layer is also provided on the portion in contact with the second lens L2 and the third lens L3. It is not done. Therefore, while the antireflection layers 54a and 54b provide a sufficient antireflection effect, the antireflection layer is destroyed by contact with the lens barrel body and the lens, and the fragments adhere to the lens and other parts as powder. Can be prevented.

(2) Inner flange FIG. 12 shows an example of the inner flange of the lens barrel body used in the present invention. The inner flange 22 shown in FIG. 12 includes an annular groove 224 provided at the rear end of the inner peripheral surface 221, an annular groove 225 provided on the outer peripheral surface side of the front surface 222, and an inner peripheral surface side of the rear surface 223. And an annular projecting portion 226 provided at the end portion.

  FIG. 13 shows a process of forming the antireflection layers 22a and 22b other than the outer peripheral surface of the inner flange 22. FIG. 13 (1) shows a half sectional view of the inner flange 22 of the barrel body 10 shown in FIG. A resist agent is applied to the outer peripheral surface side portion 2221 of the front surface 222 of the inner flange 22 and the protrusion 226 of the rear surface 223, and dried to form resist films 22c and 22d (FIG. 13 (2)). The application of the resist agent and the resist film may be the same as described above. As shown in FIG. 13 (2), when an antireflection layer is formed only on the inner flange 22 of the lens barrel body 10, a resist film 22e is also provided on the surface of the lens barrel body 10 other than the inner flange 22.

  Since a groove 225 is provided between the outer peripheral surface side portion 2221 and the inner peripheral surface side portion 222 of the front surface 222 when applying the resist agent to the inner flange 22, the resist agent applied to the outer peripheral surface side portion 2221 Is supplemented by the groove portion 225, and can be prevented from flowing into the inner peripheral surface side portion 2222. In addition, since the protrusion 226 is provided on the rear surface 223 and the groove 224 is provided at the rear end of the inner peripheral surface 221, the resist applied to the protrusion 226 is prevented from flowing into the inner peripheral surface 221 and the rear surface 223. can do.

  Similar to FIGS. 3 (3) and (4), the inner flange 22 is subjected to antireflection treatment, and then the resist films 22c and 22d are removed, whereby the inner peripheral surface side portion 2222 and the inner peripheral surface 221 of the front surface 222 are removed. The inner flange 22 having the antireflection layer 22a formed on the rear surface 223 and the antireflection layer 22b formed on the rear surface 223 is obtained. The antireflection layer 22a may be formed on a part of the groove 224 on the inner peripheral surface 221 and a part of the groove 225 on the front surface 222, and the antireflection layer 22b is also formed on a part of the protrusion 226 on the rear surface 223. May be.

  An example in which the first lens L1 and the second lens L2 are attached to the inner flange 22 provided with the antireflection layers 22a and 22b is shown in FIG. As shown in FIG. 14, the second lens L2 contacts the rear surface of the protrusion 226. An antireflection layer is not provided in a portion in contact with the first lens L1 and the second lens L2. Therefore, it is possible to prevent the antireflection layer from being destroyed due to contact with the lens and the fragments from adhering to the lens or other parts as a powder while obtaining a sufficient antireflection effect by the antireflection layers 22a and 22b. Can do.

(3) First presser ring FIG. 15 shows an example of the first presser ring used in the present invention. 15 includes a male screw portion 231 provided on the outer peripheral surface, a groove portion 235 provided on the outer peripheral surface side of the front surface 232, and a groove portion 236 provided on the rear surface side of the inner peripheral surface 234. And have.

  FIG. 16 shows a step of forming the antireflection layer 23a on the front surface and the inner peripheral surface of the first pressing ring 23. FIG. 16 (1) is a half sectional view of the first pressing ring 23 shown in FIG. The resist film 23b is formed by applying a resist agent to the external thread side 231 of the first presser ring 23, the rear surface 233, the outer peripheral surface side portion 2321 of the front surface 232, and the rear surface side portion 2342 of the inner peripheral surface 234, and drying. Fig. 16 (2)). The application of the resist agent and the resist film may be the same as described above.

  When the resist agent is applied to the first holding ring 23, the groove portion 235 is provided between the outer peripheral surface side portion 2321 and the inner peripheral surface side portion 2322 of the front surface 232, so that it was applied to the outer peripheral surface side portion 2321. The resist agent is supplemented by the groove portion 235 and can be prevented from flowing into the inner peripheral surface side portion 2322. Further, since the groove 236 is provided between the rear side 2342 and the front side 2341 of the inner peripheral surface 234, the resist applied to the rear side 2342 is supplemented by the groove 236 and flows into the front side 2341. Can be prevented.

  Similar to FIGS. 3 (3) and 3 (4), the first presser ring 23 is subjected to antireflection treatment, and then the resist film 23b is removed, whereby the inner peripheral surface side portion 2322 and the inner peripheral surface 234 of the front surface 232 are removed. The first presser ring 23 having the antireflection layer 23a formed on the front side portion 2341 is obtained.

  FIG. 17 shows an example in which the first pressing ring 23 provided with the antireflection layer 23a is installed and the first lens L1 is attached. As shown in FIG. 17, the male thread portion 231 of the first presser ring 23 that is screwed with the female thread portion 110 of the barrel body 10 is not provided with an antireflection layer, and is in a portion in contact with the first lens L1. No antireflection layer is provided. Therefore, while the antireflection layer 23a provides a sufficient antireflection effect, the antireflection layer is destroyed by contact with the lens barrel and the lens, and the fragments are prevented from adhering to the lens or other parts as powder. can do.

1 ... Tube
10 ... Body body
12,22 ... Inner flange
13, 23 ... First presser ring
14, 24, 34, 44, 54 ... spacing ring
15 ... second presser ring

Claims (9)

A method for producing an optical member by providing an antireflection layer on a substrate,
The substrate has a recess for preventing a resist film from adhering to a portion where the antireflection layer is provided between a portion where the antireflection layer is provided and a portion where the antireflection layer is not provided, Having a groove or protrusion,
A resist film is formed on a portion where the antireflection layer is not provided, and the resist film is removed after the antireflection treatment is performed on the base material on which the resist film is formed. Method. 2. The optical member manufacturing method according to claim 1, wherein the antireflection treatment is performed by performing a plating process on the base material, or performing an etching process after the plating process is performed. 3. Manufacturing method. 3. The optical member manufacturing method according to claim 1, wherein the base material is a lens barrel or an optical element support frame of the lens barrel, an interval ring, and an inner ring of a pressing ring. Manufacturing method of member. The method for manufacturing an optical member according to claim 1, wherein the concave portion, the groove portion, or the protrusion is annular. 5. The method of manufacturing an optical member according to claim 1, wherein the antireflection layer has a large number of micro protrusions having a height of 0.5 to 20 [mu] m, which are randomly formed at a pitch of 0.1 to 30 [mu] m. A method for manufacturing an optical member. 6. The method for producing an optical member according to claim 1, wherein the antireflection layer is not provided in a portion in contact with the other base material of the base material. The method for manufacturing an optical member according to claim 6, wherein the other base material is a lens. The method for manufacturing an optical member according to claim 7, wherein the protrusion is in contact with a lens. 9. The optical member manufacturing method according to claim 6, wherein the concave portion is provided at at least one end of a portion of the base material that is in contact with the other base material. Manufacturing method.

Images