JP2001124969A - Lens member and method and device for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens member for preventing generation of harmful light beams by inner surface reflection and to provide a method and a device for manufacturing a lens-holding member. SOLUTION: This lens member 11 is for clamping a lens 3 by the lens holding member 12 provided with a low reflectance part 16, by forming fine ruggedness on the outer surface of a claw 15' as a lens-supporting part, preventing harmful light beams due to the inner surface reflection, preventing generation of ghosts and flares and improving the image quality. IN this manufacturing method, the claw 15' for clamping the lens 3 is formed by heat calking and fine ruggedness of the low reflectance part 16 is formed at the some time. A calking means for constituting the manufacturing device eliminates the need for adding new components and processes, by providing a working surface provided with ruggedness for forming the fine ruggedness by thermal transfer on the low reflectance part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens member in which an optical lens used for a camera or the like is integrated into a lens holding member, and a method and apparatus for manufacturing the same.

2. Description of the Related Art Heretofore, there has been known a lens member movably disposed on an inner peripheral surface of a lens barrel in which a shutter device including a shutter and a driving device thereof is disposed.
3 (a) to 3 (d) are schematic diagrams for explaining a conventional method and apparatus for manufacturing the lens member 1, and FIG.
It is a perspective view which shows the completed conventional lens member. Less than,
A general lens member, a method of manufacturing the same, and a manufacturing apparatus thereof will be described with reference to FIGS. The lens holding member 2 is
As shown in FIG. 3A, the optical lens 3 (hereinafter, simply referred to as a lens) is formed of a thermoplastic material such as an acrylic resin into a cylindrical shape having a through hole 4 which is substantially the same as or slightly larger than the outer diameter 3a. You. At one end 2a of the lens holding member 2, a projecting portion 5 as a first supporting portion projecting toward the central axis O along the inner peripheral surface of the through hole 4 is formed as a lens supporting portion. The other end 2b is formed with a plurality of claws 8 as second support portions protruding along the inner peripheral surface of the through hole 4.
Is provided. The amount of protrusion of the protrusion 5 is such that the opening 6 formed in the center is smaller than the outer diameter 3a of the lens 3 and larger than the effective range. The lenses 3 sequentially supplied from the opening 4a on the other end 2b side are fitted into the through holes 4 of the lens holding member 2 by lens fitting means (not shown). Further, as shown in FIG. 3B, the movable portion 10 of the caulking means 7 is lowered along the central axis O by a driving means (not shown), and is heated to a temperature suitable for thermal caulking by a heating means (not shown). Machined surface 10a
Abuts against a plurality of claws 8 provided to project in the axial direction along the opening 4a, and crushes the claws 8 while heating and softening the claws. In this manner, by thermally caulking the claws 8 by the caulking means 7, as shown in FIG.
The claw 8 ′ deformed into a shape protruding toward the central axis O along the protruding portion 5 provided on the other end 2 a side
In addition, the lens 3 is held in the thickness direction as a lens support. After the completion of the heat caulking, the movable part 10 is raised again by the driving means, and the protruding part 5 and the claw 8 shown in FIG.
', The lens member 1 holding the lens 3 integrally is completed. On the side of the lens 3 on which light is incident, that is, on the lens surface on the side of the protruding portion 5, a portion exposed from the opening 6 is formed as a black sheet (not shown) having an opening corresponding to an effective range. Attach a light blocking member. As shown in FIG. 5, a plurality of projections 18 and 19 formed on the side surface 1a of the lens member 1 are formed with guide grooves 21 and 22, respectively.
The lens member 1 is held on the inner surface of the lens barrel 20 so as to be fitted into the lens barrel 20 (hereinafter simply referred to as a lens barrel) and to be movable along the optical axis direction. Although not particularly shown, a shutter and a driving device for the shutter are arranged in the lens barrel 20.

In the conventional caulking means 7 described above, the processing surface 10a of the movable portion 10 is smooth as shown in FIG. The outer surface 8'a of a certain nail 8 'has a mirror surface as shown in FIG. Therefore, the light from the opening 6
A part of the incident light passing through the mirror 8 is internally reflected by the outer surface 8'a of the nail 8 'having a mirror surface, thereby generating light (harmful light) other than for image formation, and this harmful light is within the effective range. When the light enters the inside, there is a problem in that ghosts and flares are generated and the image quality is reduced. Accordingly, an object of the present invention is to provide a lens member for preventing generation of ghosts and flares by preventing generation of harmful rays due to internal reflection, a method for manufacturing the lens member, and a manufacturing apparatus suitable for carrying out the manufacturing method. I do.

SUMMARY OF THE INVENTION A lens member according to the present invention is provided with a low-reflectance portion formed with fine irregularities on a part of the outer surface of a lens supporting portion. A method of manufacturing a lens member having an action of preventing generation of light rays, and simultaneously forming fine irregularities of a low reflectance portion when forming a protruding portion by heat caulking, and manufacturing suitable for carrying out the manufacturing method. An apparatus is provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a lens having an optical lens and a lens support having a substantially cylindrical shape and having openings at both ends to hold the optical lens in the thickness direction. A lens member comprising a holding member, wherein the lens support portion is a lens member provided with a low reflectance portion formed with fine irregularities on at least a part of its outer surface, and reflects the harmful light. This has the effect of preventing ghosts and flares from occurring. According to a second aspect of the present invention, the lens holding member is substantially equal to the outer diameter of the optical lens.
Alternatively, the lens support is formed of a thermoplastic material in a cylindrical shape having a slightly larger through-hole, and the first support portion protruding toward the center axis of the through-hole at one end of the lens holding member; At the other end, a plurality of second support portions protruding along the inner peripheral surface of the through hole are provided, and the second support portion is deformed toward the central axis by heating the first support portion.
A lens member for holding the optical lens together with the supporting portion, and has the same function as that of the first aspect. According to a third aspect of the present invention, the low-reflectance portion is a lens member in which fine irregularities are formed in a step-like manner from the outer periphery toward the center, and has the same function as the first aspect. Claim 4
In the invention described in (1), the low reflectance portion is a lens member in which fine irregularities are formed in a satin pattern, and has the same effect as that of the first aspect. The invention according to claim 5 has a through-hole approximately equal to or slightly larger than the outer diameter of the optical lens,
A cylindrical shape having a first support portion projecting toward the central axis of the through hole at one end and a plurality of second support portions projecting along the inner peripheral surface of the through hole at the other end. A step of forming a lens holding member having a substantially cylindrical shape by molding a thermoplastic material into a body, and a step of fitting the optical lens into the lens holding member from the other end provided with the second support portion. The second support portion is deformed toward the central axis by heat caulking to clamp the optical lens together with the first support portion, and at the same time, a fine surface is formed on at least a part of the outer surface of the second support portion. Forming a low-reflectance portion composed of irregularities, the method comprising the steps of:
It is suitable for manufacturing the lens holding member according to any one of (4) to (4), and has an effect that it is not necessary to add a new component or a new step in providing a low reflectance portion for preventing reflection of harmful light. The invention according to claim 6 is a method for manufacturing a lens holding member, wherein the low reflectivity portion is formed of fine irregularities formed in a stepwise manner from the outer periphery toward the center. It has a similar effect. The invention according to claim 7 is a method for manufacturing a lens holding member in which the low reflectance portion is formed by fine irregularities formed in a satin pattern, and has the same effect as in claim 5. The invention according to claim 8 has a through-hole approximately the same as or slightly larger than the outer diameter of the optical lens by molding a thermoplastic material, and has one end facing the center axis of the through-hole. A second support portion having a substantially cylindrical shape formed by providing a first support portion that protrudes along the other end and a plurality of second support portions that protrude along the inner peripheral surface of the through hole at the other end. A support,
A movable portion that contacts the optical lens from the other end provided with the second support portion in a state where the optical lens is fitted into the lens holding member, movably disposed in a central axis direction of the lens holding member, Fine irregularities are formed on the processing surface, and the second support portion is thermally caulked via the movable portion, whereby the second support portion is deformed toward the central axis and is together with the first support portion. An apparatus for manufacturing a lens member, comprising: a heat caulking means for forming a shape for holding the optical lens and simultaneously forming a low-reflectance portion having fine irregularities on at least a part of an outer surface of the second support portion. It is suitable for carrying out the method for manufacturing a lens holding member according to any one of claims 5 to 7, and has an effect that a low reflectance portion for preventing reflection of harmful light can be formed without adding new parts or steps. Have. The invention according to claim 9 is an apparatus for manufacturing a lens holding member, wherein the fine unevenness formed on the processing surface is formed by fine unevenness formed in a step shape from the outer periphery toward the center. Has the same function as that of the eighth aspect. The invention according to claim 10 is an apparatus for manufacturing a lens holding member, wherein the fine irregularities formed on the processing surface are formed by fine irregularities formed in a satin pattern. Has an action. (Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a lens member according to the present invention, and FIG. 2 is a schematic view showing an embodiment of a method and apparatus for manufacturing a lens member according to the present invention. In the figure, components having the same reference numerals as those in FIG. 4 and the like indicate the same functional components. As shown in FIG. 1, the lens holding member 12 holds the lens 3 in the thickness direction between the protrusion 5 and the claw 15 ′, and along the lens 3 along the optical axis direction inside a lens barrel (not shown). Member 11 movably disposed
Is configured. On a part of the outer surface of the nail 15 ′, a low-reflectance portion 16 formed of fine irregularities is formed by a manufacturing method described later,
It is provided in the manufacturing equipment. As shown in FIG. 2A, the manufacturing method and the manufacturing apparatus of the lens member 11 are such that the lens holding member 12 is formed into a cylindrical shape having a through hole 4 substantially equal to or slightly larger than the outer diameter 3a of the lens 3. It is formed of a thermoplastic material such as an acrylic resin. The lens holding member 1
2 is formed by a general molding means such as an injection molding device (not shown). One end 12a of the lens holding member 12
Is provided with a protrusion 5 having an opening 6 as a lens support. The amount of protrusion of the protruding portion 5 is set to such an extent that the opening 6 is smaller than the outer diameter 3a of the lens 3 and larger than the effective range, as in the conventional example. The lenses 3 sequentially supplied from the opening 4a on the other end 12b side into the through hole 4 of the lens holding member 12 are fitted by lens fitting means (not shown). Subsequently, the movable portion 14 of the caulking means 13 is lowered along the central axis O 'by a driving means (not shown) as shown in FIG. Heated working surface 14
a heats and softens a plurality of claws 15 provided to protrude in the axial direction along the lens fitting entrance 4a and crushes them. At this time, in the present invention, the above-described movable unit 1 is used.
For example, fine irregularities are formed in at least a part of the processing surface 14a in a stepwise manner from the outer periphery toward the center. Accordingly, by thermally caulking the claw 15 by the caulking means 13, the claw 15 'deformed into a shape protruding toward the central axis O' along the through hole 4 as shown in FIG.
Holds the lens 3 in the thickness direction as a lens support together with the protrusion 5 provided on the other end 12a side, and at the same time, the outer surface 15 of the claw 15 'which is the lens support.
The fine irregularities of the processing surface 14a are transferred to 'a. As a result, the outer surface 15'a of the nail 15 'does not become a mirror surface as in the related art, but becomes a low-reflectance portion 16 that does not easily cause internal reflection. Can be prevented from occurring. After the completion of the heat caulking, the movable portion 14 is raised again by the driving means, and the lens member 11 that integrally clamps the lens 3 with the protruding portion 5 and the claw 15 ′ shown in FIG. 1 is completed. The completed lens member 11 has a plurality of projections 18 and 19 formed on the side surface 11a fitted into the guide grooves 21 and 22 and can move along the optical axis direction, similarly to the conventional example shown in FIG. It is incorporated into the lens barrel 20 in the form. Therefore, it is not necessary to add a new component or increase the number of processes for forming the low reflectance portion 16, so that the cost and the like are not increased, and the productivity and cost are the same as those of the prior art, but only the quality. Is to improve. Further, an example of the specific shape of the fine unevenness formed on the low reflectance portion 16 has been described above, and FIG.
As shown in the enlarged cross-sectional view of FIG. 5, irregularities formed stepwise from the outer peripheral side toward the center, or not particularly shown,
Pearskin pattern with dotted fine irregularities scattered, nails 15 '
Any shape may be used as long as it is minute unevenness that makes it difficult to reflect the outer surface 15 ′ a of the light emitting device. The range in which the low reflectance portion 16 is formed may be the entire outer surface 15 ′ a of the nail 15 ′, or may prevent internal reflection, for example, by limiting the width to a certain width from the tip. It may be limited to a specific range.

As described above, the lens member of the present invention is provided with a low reflectance portion by forming fine irregularities on at least a part of the outer surface of the lens support portion. Incident light that has passed through the lens is internally reflected to produce light rays (harmful light rays) other than for image formation, preventing it from entering the effective range, preventing ghosts and flares, and improving image quality. Has an effect. Further, in the method for manufacturing a lens member according to the present invention, in order to hold the lens fitted through the opening integrally with the lens holding member, the claw provided at the end of the lens holding member is thermally swaged and the outside of the claw is simultaneously removed. This includes the step of forming fine irregularities on the surface to provide a low-reflectance portion.As a result, there is no need to add new parts or processes, and the ghost due to internal reflection is maintained while maintaining the same productivity as before. This has the effect that a lens holding member that improves image quality by preventing the occurrence of flares and flares can be formed. In the apparatus for manufacturing a lens member according to the present invention, the movable portion movable along the central axis of the lens holding member formed of a thermoplastic material has a driving unit and a heating unit, and the processing surface has fine irregularities. In order to integrally hold the lens fitted through the opening with the lens holding member, a claw provided in the opening is thermally caulked to form a lens support portion, and at the same time, fine irregularities are formed on the outer surface of the claw. And means for providing a low-reflectance portion by forming the lens support portion.As a result, the formation of the lens support portion by heat caulking and the formation of the low-reflectance portion provided on the surface thereof are simultaneously processed, and are equivalent to those in the related art. In other words, it is possible to manufacture a lens holding member that can improve the image quality while maintaining the productivity of (1), that is, shortening the processing steps and preventing the occurrence of ghost or flare due to internal reflection.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a lens member according to the present invention.

FIG. 2 is a schematic view showing an embodiment of a manufacturing process and a manufacturing apparatus of a lens member according to the present invention.

FIG. 3 is a schematic view showing a manufacturing process and a manufacturing apparatus of a conventional lens member.

FIG. 4 is a perspective view showing a conventional lens member.

FIG. 5 is a schematic sectional view showing a conventional lens member incorporated in a lens barrel.

[Explanation of symbols]

 Reference Signs List 3 optical lens 3a lens outer periphery 4 opening 4a lens fitting entrance 5 projecting portion (first supporting portion) 6 opening 11 lens member 12 lens holding member 13 crimping device 14 movable portion 14a working surface 15 claw 15 'claw (second Supporting part) 16 Low reflectance part 18, 19 Projection 20 Lens tube 21, 22 Guide groove

Claims (10)

[Claims] 1. A lens member comprising: an optical lens; and a lens holding member having a substantially cylindrical shape and having a lens support portion that holds the optical lens in the thickness direction with openings at both ends. The lens member includes a low-reflectance portion formed with fine irregularities on at least a part of its outer surface. 2. The lens holding member is formed of a thermoplastic material in a cylindrical shape having a through hole substantially equal to or slightly larger than the outer diameter of the optical lens, and a lens support is provided at one end of the lens holding member. A first support portion protruding toward the central axis of the through hole, and a plurality of second support portions protruding along the inner peripheral surface of the through hole at the other end. 2. The lens member according to claim 1, wherein the lens member is deformed toward the central axis by heating, and the optical lens is held together with the first support portion. 3. 3. The lens member according to claim 1, wherein the low-reflectance portion is formed by forming fine irregularities in a step shape from the outer periphery toward the center. 4. The lens member according to claim 1, wherein the low-reflectance portion has fine irregularities formed in a satin pattern. 5. A first supporting portion having a through-hole approximately the same as or slightly larger than the outer diameter of the optical lens and protruding toward the central axis of the through-hole at one end and the other end at the other end. Forming a lens holding member having a substantially cylindrical shape by molding a thermoplastic material into a cylindrical body provided with a plurality of second support portions protruding along the inner peripheral surface of the through hole; A step of fitting the optical lens into the lens holding member from the other end on which the support portion is provided, and deforming the second support portion toward the central axis by heat caulking the first support portion. Forming a low-reflectance portion made of fine irregularities on at least a part of the outer surface of the second support portion while holding the optical lens together with the portion. 6. The method for manufacturing a lens holding member according to claim 5, wherein the low reflectance portion is formed by fine irregularities formed in a stepwise manner from the outer periphery toward the center. 7. The method for manufacturing a lens holding member according to claim 5, wherein the low reflectance portion is formed by fine irregularities formed in a satin pattern. 8. An optical lens formed by molding a thermoplastic material into a substantially cylindrical shape, wherein an optical lens housed in the cylindrical portion is provided with a first support portion and a second support portion deformed by heat caulking. An apparatus for manufacturing a lens member, comprising: a crimping means for thermally deforming the second support portion of the lens holding member sandwiched between the lens holding member and the lens holding member. A movable portion arranged movably in the direction of the central axis of
An apparatus for manufacturing a lens member, wherein a low-reflectance portion made of fine irregularities is formed on at least a part of an outer surface of the second support portion while simultaneously caulking the support portion. 9. The apparatus for manufacturing a lens holding member according to claim 8, wherein the fine unevenness formed on the processing surface is formed by a fine unevenness formed stepwise from the outer periphery toward the center. . 10. The fine unevenness formed on the processing surface,
9. The apparatus for manufacturing a lens holding member according to claim 8, wherein the apparatus is made of fine irregularities formed in a satin shape.