WO2018062018A1

WO2018062018A1 - Lens unit and crimping device

Info

Publication number: WO2018062018A1
Application number: PCT/JP2017/034223
Authority: WO
Inventors: 兆路山田
Original assignee: 日本電産サンキョー株式会社
Priority date: 2016-09-27
Filing date: 2017-09-22
Publication date: 2018-04-05
Also published as: JP2018054735A

Abstract

Provided are a lens unit in which an optical filter is incorporated, and a crimping device, the lens unit wherein the occurrence of rattling, chipping, separation, and breakage of the optical filter can be suppressed, and the crimping device being suitable for use in manufacturing the lens unit. The object of the present invention is achieved by a lens unit having a holder part for retaining a flat-plate-shaped optical filter, the lens unit characterized in that the holder part has a crimping rib which is a rib for crimp-fixing the peripheral edge of the optical filter, and the deformed crimping rib has a level-difference part formed by pressing of the distal-end part of the crimping rib more deeply in a step shape than the proximal-end side thereof.

Description

Lens unit and caulking device

The present invention relates to a lens unit and a caulking device, and more particularly to a lens unit that is stepped and crimped by a caulking head and a caulking device that has a structure for stepping caulking.

The following Patent Document 1 discloses a method for attaching a diaphragm to a resin molded body. In this attachment method, since the caulking is started after the vibration plate is first pressed against the step portion of the resin molded body by the pressing member, an uneven and large force is not applied to the vibration plate. For this reason, the diaphragm is not warped or deformed, and the vibration characteristics are not adversely affected. Therefore, reliability can be improved.

Patent Document 2 below discloses a lens frame, a caulking member, a lens assembly, and a method for thermal caulking of the lens. This thermal caulking method can suppress deterioration of optical characteristics due to thermal caulking even if there is a dimensional error between the lens and the lens frame.

JP-A-4-334436 JP 2014-174224 A

Conventionally, when an optical filter is installed in a lens barrel lens frame, the optical filter is placed on the lens frame, and the caulking rib extending from the lens frame is pressed from above with a caulking head with a flat tip, and heat caulked. As a result, the caulking rib is hooked on the optical filter and fixed. The height of the caulking rib is slightly varied due to molding variation. Therefore, caulking is insufficient or excessive caulking occurs.

When caulking is insufficient, after caulking, there is a slight gap between the caulking rib and the thickness direction of the optical filter. When vibration is applied, the optical filter may become loose and the optical filter may be chipped or detached. In some cases, a chip with a missing optical filter may enter the lens barrel. Further, when the pressing force of the caulking head is increased in order to eliminate the generation of a gap, excessive caulking may occur and the optical filter may be broken.

The cited document 1 is a structure in which the crimping portion is deformed into a shape of a crimping groove formed at the tip of the crimping formation portion and is in close contact with the outer surface of the diaphragm, thereby being fixed to the resin case. Is a gently sloping surface shape toward the inside of the crimping portion, and the crimping portion is pressed inward from the end of the diaphragm with the same force. For this reason, rattling may occur between the diaphragm and the caulking portion due to variations in the caulking portion and the pressing force of the caulking mold.

Further, in Cited Document 2, a tip, a tip surface forming portion, a top surface forming portion, and a relief portion are arranged concentrically in this order from the inner periphery to the outer periphery on the tip portion opposite to the base end portion of the horn portion. However, since the melted portion of the caulking projection melted during thermal caulking is accommodated in the groove, the caulking projection has the same force inward from the end of the lens. Pressed with. For this reason, rattling may occur between the lens and the lens frame portion due to variations in the forming of the caulking projections and variations in the pressing force of the pressurizing unit of the thermal caulking device.

Therefore, when an optical filter is incorporated into a lens frame, a structure capable of suppressing the occurrence of backlash, chipping, detachment, and cracking of the optical filter is required in a lens unit and a caulking device incorporating the optical filter.

In view of the above problems, the problem to be solved by the present invention is a lens unit that can suppress the occurrence of rattling, chipping, detachment, and cracking of an optical filter, and a crimping device that is preferably used for manufacturing a lens unit. It is to provide.

In order to solve the above-mentioned problems, the lens unit of the present invention is a lens unit having a holder part that holds a flat optical filter, and the holder part is a caulking rib that is a rib for caulking and fixing the periphery of the optical filter. The deformed caulking rib is characterized in that it has a stepped portion formed by pressing the tip end portion of the caulking rib deeper stepwise than the base end side.

When the peripheral edge of the optical filter is fixed by caulking ribs, when pressing with a substantially uniform force from the proximal end side of the caulking ribs to the distal end portion, positional deviation when placing the optical filter on the holder portion, A gap may be generated between the optical filter and the caulking rib without the caulking rib coming into close contact with the optical filter due to variations in the pressing force, variations in the rib shape after deformation, or the like. For this reason, the optical filter rattles between the holder unit due to vibrations applied to the lens unit, and the upper surface side or corners of the outer peripheral surface of the optical filter come into contact with the caulking ribs. May occur. Note that the upper and lower surfaces at this time are defined as the upper surface of the end face of the optical filter that contacts the caulking rib and the lower surface as the opposite surface.

In the lens unit of the present invention, a stepped portion that is pressed deeper in a step shape than the proximal end side of the crimping rib is formed at the distal end of the crimped rib after deformation. Since the stepped portion is pressed deeper than the base end side and fixed by caulking, the optical filter is supported in close contact with the caulking rib by the stepped portion, and generation of a gap between the optical filter and the caulking rib is suppressed. Therefore, even when vibration or the like is applied to the lens unit, the optical filter can be prevented from rattling with the caulking rib, and the upper surface side or corner of the outer peripheral surface of the optical filter can be prevented from contacting the caulking rib. Problems such as chipping, detachment, and cracking can be suppressed.

In addition, since the step portion is pressed deeply in a step shape, it is possible to prevent displacement of the caulking rib during pressing.

Further, the holder part is a member in which a lens holding part that holds a plurality of lenses arranged in the optical axis direction and a filter holding part that holds the optical filter are integrally formed, and the filter holding part includes: A filter mounting surface provided on an image side end of the holder unit, on which the optical filter is mounted, and a plurality of claw-shaped caulking ribs that caulking and fixing the image side periphery of the optical filter; It is preferable to have.

When the lens holding part and the filter holding part are separate, a cumulative error or the like occurs when the lens held by the lens holding part and the optical filter held by the filter holding part are assembled. However, since the holder portion is a member in which the lens holding portion and the filter holding portion are integrally formed, the positioning accuracy between the lens and the optical filter can be increased. Moreover, since the filter holding part has a filter mounting surface and a plurality of claw-shaped caulking ribs, the periphery of the optical filter mounted on the filter mounting surface is hung with the claw-shaped caulking ribs. Caulking can be fixed. Moreover, a separate member for caulking and fixing the optical filter is not required, and a plurality of claw-shaped caulking ribs can be caulked and fixed.

Further, it is preferable that the step portion of the caulking rib is disposed on the inner side in the same plane direction than the position of the outer peripheral surface in the plane direction of the optical filter.

Since the step portion is disposed on the inner side in the same plane direction from the position of the outer peripheral surface in the planar direction of the optical filter, the upper surface side or corner portion on the outer peripheral surface of the optical filter is not pressed. Therefore, it is possible to prevent stress from being applied to the upper surface side or corners on the outer peripheral surface of the optical filter, and it is possible to prevent defects such as chipping, detachment, and cracking of the optical filter.

Further, it is preferable that a gap is provided between the outer peripheral surface in the planar direction of the optical filter and the surface of the caulking rib facing the outer peripheral surface. Further, when the surface of the optical filter that contacts the caulking rib is the upper surface and the opposite surface is the lower surface, the stepped portion of the caulking rib is disposed on the upper surface of the optical filter, and outside the upper surface It is preferable that the second gap is provided in the portion.

By providing the gap, it is possible to prevent the caulking rib surface from coming into contact with the upper surface side or the corner of the outer peripheral surface of the optical filter when the caulking is fixed. For this reason, it is possible to suppress chipping, detachment, cracking, and the like of the optical filter due to the pressing force during caulking.

Further, when the surface of the optical filter that contacts the caulking rib is the upper surface and the opposite surface is the lower surface, the upper surface side of the outer peripheral surface of the optical filter and the caulking rib that faces the upper surface side of the outer peripheral surface It is preferable that a gap is provided between the surface and the surface of the caulking rib that faces the lower surface side of the outer peripheral surface of the optical filter protrudes toward the optical filter side.

Since there is a gap between the upper surface side of the outer peripheral surface of the optical filter and the caulking rib surface facing the upper surface side of the outer peripheral surface, the upper surface side of the outer peripheral surface of the optical filter and the caulking rib are in contact with each other. There is nothing. Therefore, chipping, removal, cracking, and the like of the optical filter can be prevented. Moreover, since the surface of the caulking rib that faces the lower surface side of the outer peripheral surface of the optical filter protrudes to the optical filter side, the accuracy of the position of the optical filter can be improved.

Moreover, it is preferable that the tip end portion of the crimped rib after deformation is recessed in a substantially arc shape in a plan view.

By pressing the tip of the caulking rib using a cylindrical pressing member, the pressing member does not require adjustment in the circumferential direction of the pressing member, and can be easily crimped. Further, the periphery of the optical filter can be caulked and fixed simultaneously by the tip portions of the plural caulking ribs.

The caulking device of the present invention further includes a caulking jig having a caulking head for caulking the work, and a caulking support for supporting the work so as to face the caulking head, and the caulking support for the caulking support. When the position of the jig is up and the position of the caulking cradle with respect to the caulking jig is down, the lower surface of the caulking head is arranged at the first caulking surface and the center of the first caulking surface, The gist of the present invention is to have a second crimping surface projecting downward from the first crimping surface.

Since the lower surface of the caulking head includes a first caulking surface and a second caulking surface that is disposed at the center of the first caulking surface and projects downward from the first caulking surface, the second caulking surface Can heat caulk the inner side of the outer edge of the caulking object. For example, when the optical filter is placed on the holder portion of the lens unit, which is a workpiece, the center side can be pressed deeper than the corner portion while avoiding the corner portion of the optical filter that is easily broken. Therefore, after heat caulking, there is no backlash between the optical filter and the holder portion of the lens unit, and problems such as chipping, detachment, and cracking of the optical filter can be suppressed.

Further, the surface shape of the second caulking surface is preferably circular when viewed from the bottom.

By pressing with the second caulking surface that is circular when viewed from the bottom, it is not necessary to adjust the circumferential direction of the second caulking surface, and easy caulking can be fixed.

The caulking cradle includes a movable portion that supports the workpiece, a base portion that supports the movable portion so as to be movable in the vertical direction, and a biasing member that biases the movable portion upward. It is preferable.

When stress is applied to the workpiece by moving the movable part downward, the movable part moves further downward against the biasing force of the biasing member, and excessive stress is applied to the workpiece. To prevent. Therefore, chipping, detachment, cracking, etc. of the workpiece can be suppressed.

Further, it is preferable that the urging member reduces the pressure by sinking the movable part when the pressure applied to the work from the caulking head exceeds a predetermined threshold value.

とき When pressure is applied to the workpiece exceeding a predetermined threshold due to dimensional variation of the workpiece, etc., the biasing member sinks the movable part and reduces the pressure. Therefore, it is possible to prevent excessive pressure from being applied to the optical filter, and it is possible to crimp the work with a pressure that does not exceed the threshold value.

The base portion is a member having a substantially cylindrical tube portion, the movable portion is fitted in a tube of the tube portion, and the upper portion of the movable portion extends above the tube portion. An annular flange portion extending radially outward is formed at an upper portion of the movable portion, and the base portion has a guide pin that is a rod-like body extending above the cylindrical portion. The guide pin is preferably inserted through a hole formed in the flange portion of the movable portion.

Since the guide pin is inserted through the hole formed in the flange part of the movable part, there is no displacement in the circumferential direction between the movable part and the base part, and the caulking head is not displaced in the movable part. Can be pressed.

Further, it is preferable that the workpiece is a holder portion of the lens unit of the present invention.

Since the workpiece is the holder unit of the lens unit, for example, when the optical filter is placed on the holder unit of the lens unit that is the workpiece, the lower surface of the caulking head includes the first caulking surface and the first caulking surface. The second caulking surface is arranged at the center of the optical filter and protrudes downward from the first caulking surface, so that the second caulking surface avoids the corner of the optical filter which is easily broken and is centered from the corner. The side can be pressed deeply. Therefore, there is no backlash between the optical filter and the lens unit holder after heat caulking, and there are no problems such as chipping, detachment or cracking of the optical filter.

According to the lens unit and the caulking device according to the present invention, there are provided a lens unit that can suppress the occurrence of rattling, chipping, detachment, and cracking of the optical filter, and a caulking device that is preferably used for manufacturing the lens unit. be able to.

It is explanatory drawing which shows the whole structure of the lens unit 1 and the crimping apparatus 7. FIG. 2 is an explanatory diagram showing a configuration of a lens unit 1. FIG. (A) It is explanatory drawing which shows the crimping rib 42 after the crimping in the lens unit 1. FIG. (B) It is the elements on larger scale which show the crimping rib 42 before the crimping in the lens unit 1. FIG. (C) It is the elements on larger scale of the part enclosed with the dotted line A of FIG. 2, which shows the crimping rib 42 after crimping in the lens unit 1. FIG. It is the elements on larger scale which show the crimping rib 43 of other embodiment.

Hereinafter, embodiments of a lens unit and a caulking device according to the present invention will be described in detail with reference to the drawings. The “image side” in the present invention refers to the image side in the direction of the optical axis L shown in FIG.

(overall structure)
As shown in FIGS. 1 and 2, the caulking device 7 includes a caulking jig 8 having a caulking head 81 for fixing the optical filter 10 to the holder portion 2 constituting the lens unit 1 by heat caulking, and the holder portion. 2 and a caulking cradle 9 that supports the caulking head 81 so as to face the caulking head 81.

When the position of the caulking jig 8 with respect to the caulking jig 9 is up and the position of the caulking jig 9 with respect to the caulking jig 8 is down, the lower surface of the caulking head 81 has a first caulking surface 81a and a first caulking surface. A second caulking surface 81b that is disposed in the center of 81a and projects downward from the first caulking surface 81a is formed.

The holder portion 2 of the lens unit 1 which is a work of the present embodiment is placed on the movable portion 91 of the caulking cradle 9 that constitutes the caulking device 7. An optical filter 10 is placed on the holder portion 2. The optical filter 10 is caulked and fixed to the holder part 2 when the caulking head 81 presses the holder part 2. In addition, the workpiece | work has shown the holder part 2 of the lens unit 1, and the optical filter 10 is also contained in a workpiece | work.

The optical filter 10 is heat caulked to the holder portion 2 by the first caulking surface 81a and the second caulking surface 81b. Moreover, the center part side of the optical filter 10 can be pressed more deeply than the 1st crimping surface 81a with the 2nd crimping surface 81b. Therefore, there is no backlash between the optical filter 10 and the holder part 2 after heat caulking, and the optical filter 10 is free from defects such as chipping, detachment, and cracking.

Further, the surface shape of the second caulking surface 81b is circular when viewed from the bottom. In other words, the second crimping surface 81b protrudes downward in a substantially cylindrical shape from the first crimping surface 81a. Therefore, by pressing the holder portion 2 with the second caulking surface 81b that is circular when viewed from the bottom, it is not necessary to adjust the circumferential direction of the caulking head 81 with respect to the optical axis L, and the caulking can be easily fixed.

The caulking cradle 9 includes a movable portion 91 that supports the lens unit 1, a base portion 92 that supports the movable portion 91 so as to be movable in the vertical direction, and a spring that is a biasing member that biases the movable portion 91 upward. 93. Further, the caulking head 81 moves downward, and the first caulking surface 81a and the second caulking surface 81b press the caulking rib 42, thereby caulking and fixing the optical filter 10. At this time, when the caulking head 81 further moves downward, the movable portion 91 moves downward against the urging force of the spring 93. Therefore, it is possible to prevent excessive stress from being applied to the optical filter 10 and to suppress chipping, detachment, cracking, and the like of the optical filter 10.

When the pressure applied from the caulking head 81 to the optical filter 10 placed on the holder unit 2 exceeds a predetermined threshold, the spring 93 lowers the movable unit 91 to reduce the pressure. Therefore, it is possible to prevent excessive pressure from being applied to the optical filter 10 and to suppress chipping, detachment, and cracking of the optical filter 10 when the caulking is fixed.

The base portion 92 is configured by a substantially cylindrical tube portion 92a. Moreover, the movable part 91 is fitted in the cylinder of the cylinder part 92a, and the upper part of the movable part 91 extends above the cylinder part 92a. In addition, an annular flange portion 91 a extending outward in the radial direction is formed on the upper portion of the movable portion 91. The base portion 92 has a guide pin 92b that is a rod-like body extending above the cylindrical portion 92a. The guide pin 92b is inserted into a hole portion 91b formed in the flange portion 91a of the movable portion 91. ing. Therefore, there is no positional displacement in the circumferential direction between the movable portion 91 and the base portion 92, and the caulking head 81 can be pressed without being displaced relative to the movable portion 91.

In the case where the caulking head 81 moves until pressure is applied to the optical filter 10 exceeding a predetermined threshold due to the dimensional variation of the optical filter 10 or the positional deviation of the optical filter 10 placed on the holder portion 2. However, since the movable portion 91 sinks against the urging force of the spring 93 to reduce the pressure, it is possible to prevent excessive pressure from being applied to the optical filter 10 and to prevent the optical filter 10 from being chipped, detached or cracked. Can be suppressed.

(Lens unit configuration)
As shown in FIG. 2, the lens unit 1 is formed with a holder portion 2 that holds a flat optical filter 10. The holder portion 2 is formed with a caulking rib 42 that is a rib for caulking and fixing the periphery of the optical filter 10. The caulking rib 42 has a stepped portion 42b formed by pressing the distal end portion 42a of the caulking rib 42 deeper in a step shape than the base end side 42d.

Since the step portion 42b is pressed deeper than the base end side 42d and fixed by caulking, the optical filter 10 is supported in close contact with the caulking rib 42 by the step portion 42b, and a gap between the optical filter 10 and the caulking rib 42 is obtained. Is suppressed. That is, when the surface of the optical filter 10 that contacts the caulking rib 42 is the upper surface 101 and the opposite surface is the lower surface 102, the optical filter 10 is in close contact with the side surface of the optical filter 10 of the step portion 42b. It is supported by doing.

The holder portion 2 is a member in which a lens holding portion 3 that holds a plurality of lenses (not shown) arranged in the optical axis L direction and a filter holding portion 4 that holds an optical filter 10 are integrally formed. is there. The movable portion 91 includes a cylinder portion 91c for holding the holder portion 2 and a holder portion placement surface 91d that is an end portion of the cylinder portion 91c. Further, the holder portion mounting surface 91 d supports the flange portion 2 a of the holder portion 2.

In the case where the lens holding unit 3 and the filter holding unit 4 are separate bodies, there are accumulated errors at the time of assembling the lens held by the lens holding unit 3 and the optical filter 10 held by the filter holding unit 4. appear. However, since the holder portion 2 is a member in which the lens holding portion 3 and the filter holding portion 4 are integrally molded, the positioning accuracy between the lens and the optical filter 10 can be increased.

The filter holding part 4 is provided at the image side end of the holder part 2, and a filter placement surface 41 on which the optical filter 10 is placed is formed. Further, as shown in FIG. 3A, the holder portion 2 includes a plurality of claw-like caulking ribs 42 for caulking and fixing the image side periphery of the optical filter 10 to the outer peripheral portion of the filter mounting surface 41. Four locations are formed.

Since the filter holding portion 4 is formed with the filter mounting surface 41 and a plurality of claw-like caulking ribs 42, the filter holding portion 4 can be caulked and fixed only by positioning the optical filter 10 on the filter mounting surface 41. Further, a plurality of claw-like caulking ribs 42 can be caulked and fixed by a plurality of claw-like caulking ribs 42 without requiring a separate member for caulking and fixing the optical filter 10.

Further, as shown in FIG. 3C, the caulking rib 42 has a stepped portion 42 b on the inner side in the same plane direction from the position of the outer peripheral surface 10 a in the planar direction of the optical filter 10. Therefore, the upper surface side 10b or the corner portion 10d of the outer peripheral surface 10a of the optical filter 10 is not deeply pressed. Therefore, it is possible to prevent stress from being applied to the upper surface side 10b or the corner portion 10d of the outer peripheral surface 10a of the optical filter 10, and it is possible to prevent problems such as chipping, disconnection, and cracking of the optical filter 10. Here, the plane direction is a direction in which FIG. Further, the inner side in the same plane direction from the position of the outer peripheral surface 10a is a side closer to the optical axis L in FIG. 2 than the outer peripheral surface 10a.

Further, as shown in FIG. 3B, a gap 44 is formed between the outer peripheral surface 10a of the optical filter 10 and the surface 42c of the caulking rib 42 facing the outer peripheral surface 10a. Therefore, it is possible to prevent the surface 42c of the crimping rib 42 from coming into contact with the upper surface side 10b or the corner 10d of the outer peripheral surface 10a of the optical filter 10 when the crimping is fixed. That is, the stepped portion 42 b of the caulking rib 42 is disposed on the upper surface of the optical filter 10, and is disposed so that the second gap 48 is provided on the outer portion of the upper surface 101 of the optical filter 10. Therefore, it is possible to suppress the pressing force from the caulking head 81 from being applied to the upper surface side 10b. In addition, after the caulking is fixed, it is possible to prevent the upper surface side 10b or the corner 10d of the optical filter 10 from being chipped, detached, cracked, or the like.

(Caulking fixed)
In the caulking, the caulking head 81 on which the first caulking surface 81a and the second caulking surface 81b are formed is heated. After the caulking head 81 is heated, the optical filter 10 is fixed to the holder portion 2 by pressing the first caulking surface 81a and the second caulking surface 81b against the holder portion 2 as shown in FIG. . At this time, since the second crimping surface 81b projects downward from the first crimping surface 81a, the second crimping surface 81b can press the center side of the holder portion 2 deeper than the first crimping surface 81a. Therefore, after the caulking is fixed, the surface 42c of the caulking rib 42 can be prevented from coming into contact with the upper surface side 10b or the corner 10d of the outer peripheral surface 10a of the optical filter 10 without rattling between the optical filter 10 and the caulking rib 42. In addition, defects such as chipping, detachment, and cracking of the optical filter 10 do not occur.

Further, as shown in FIGS. 3A and 3C, a stepped portion 42b is formed at the tip 42a of the crimping rib 42 after the crimping is fixed, and the stepped portion 42b is recessed in a substantially arc shape in plan view. Is formed. Therefore, there is no need to adjust the caulking head 81 in the circumferential direction with respect to the optical axis L, and easy caulking can be achieved. Further, the peripheral edge of the optical filter 10 can be caulked and fixed simultaneously by the tip portions 42 a of the four caulking ribs 42. In addition, planar view is a direction which sees Fig.3 (a).

Further, as shown in FIG. 3B, the caulking rib 42 before the caulking is fixed has the surface 42 c of the caulking rib 42 formed substantially perpendicular to the filter mounting surface 41. The caulking rib 42 shown in FIG. 3B presses the heated caulking head 81 against the caulking rib 42, so that the first caulking surface 81 a and the second caulking surface 81 b formed on the caulking head 81 are caulking ribs 42. The caulking rib 42 is deformed in contact with. Therefore, as shown in FIG. 3C, a stepped portion 42 b is formed at the tip 42 a of the caulking rib 42.

The stepped portion 42b is formed by pressing the caulking rib 42 with a second caulking surface 81b projecting downward from the first caulking surface 81a. Therefore, the stepped portion 42b is pressed deeper than the portion crushed by the first caulking surface 81a. For this reason, after the caulking and fixing, the optical filter 10 and the holder part 2 can be prevented from rattling, and defects such as chipping, detachment, and cracking of the optical filter 10 can be suppressed.

Further, the caulking rib 42 has a pressing force from the caulking head 81 to the upper surface side 10b or the corner portion 10d because the surface 42c of the caulking rib 42 does not contact the upper surface side 10b or the corner portion 10d of the outer peripheral surface 10a of the optical filter 10. Can be suppressed. For this reason, after the caulking is fixed, the upper surface side 10b or the corner portion 10d of the optical filter 10 can be prevented from being chipped, broken, and the like, so that problems such as chipping, detachment, and cracking of the optical filter 10 can be suppressed.

(Other embodiments of caulking ribs)
FIG. 4 is a partially enlarged view showing the caulking rib 43 of another embodiment. In addition, since the basic structure of this form is the same as that of the said embodiment, it attaches | subjects the same code | symbol to a common part, and abbreviate | omits those detailed description.

In the caulking rib 43 of another embodiment, a gap 45 is formed between the upper surface side 10b of the outer peripheral surface 10a of the optical filter 10 and the surface 43c of the caulking rib 43 facing the upper surface side 10b. Therefore, the upper surface side 10b of the outer peripheral surface 10a of the optical filter 10 and the caulking rib 43 do not come into contact with each other. Therefore, chipping, detachment, cracking, and the like of the optical filter 10 can be prevented.

Further, the surface 43d of the caulking rib 43 that faces the lower surface side 10c of the outer peripheral surface 10a of the optical filter 10 is a protruding portion that is formed to protrude to the optical filter 10 side. Therefore, the accuracy of the placement position of the optical filter 10 on the filter placement surface 41 can be improved.

The embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. The caulking rib is included in the present invention as long as it is formed at the periphery of the optical filter. Therefore, for example, a configuration in which caulking ribs are formed at three locations on the periphery of the optical filter, a configuration in which caulking ribs are formed at five or more locations on the periphery of the optical filter, and a configuration that presses the entire surface continuously with the periphery of the optical filter. Forms such as a substantially rectangular tube shape or a substantially cylindrical shape are also included in the present invention.

1 Lens unit (work)
2 Holder part (work)
3 Lens holding portion 4 Filter holding portion 41 Filter mounting surface 42 Caulking rib 42a Caulking rib tip 42b Caulking rib step 42c Caulking rib surface 42d Caulking rib proximal end 43 Caulking rib surface 43d Caulking rib surface 43d Caulking rib surface 44 Clearance 45 Clearance 7 Caulking device 8 Caulking jig 81 Caulking head 81a Caulking head first caulking surface 81b Caulking head second caulking surface 9 Caulking cradle 91 Movable portion 91a Movable portion flange portion 91b Movable portion hole portion 92 Base portion 92a Base Cylindrical portion 92b of base portion Guide pin 93 of base portion Spring (biasing member)
10 Optical filter (work)
10a Outer peripheral surface 10b of optical filter Upper surface side 10c of optical filter Lower surface side of optical filter

Claims

A lens unit having a holder portion for holding a flat plate-shaped optical filter,
The holder part has a caulking rib that is a rib for caulking and fixing the periphery of the optical filter,
The deformed caulking rib has a step portion formed by pressing the tip end portion of the caulking rib deeper in a step shape than the base end side thereof.
The holder part is a member in which a lens holding part for holding a plurality of lenses arranged in the optical axis direction and a filter holding part for holding the optical filter are integrally formed,
The filter holding portion is provided at an image side end portion of the holder portion, and has a plurality of claw-like shapes for caulking and fixing a filter mounting surface on which the optical filter is mounted and an image side periphery of the optical filter. The lens unit according to claim 1, further comprising: a caulking rib.
3. The lens unit according to claim 1, wherein the step portion of the caulking rib is arranged on the inner side in the same plane direction than the position of the outer peripheral surface in the plane direction of the optical filter.
The clearance gap is provided between the outer peripheral surface in the plane direction of the said optical filter, and the surface of the said crimping rib facing this outer peripheral surface, The Claim 1 characterized by the above-mentioned. The lens unit described in 1.
When the surface of the optical filter in contact with the caulking rib is the upper surface, and the surface on the opposite side is the lower surface,
The step portion of the caulking rib is disposed on the upper surface of the optical filter, and is disposed so that a second gap is provided in an outer portion of the upper surface. The lens unit according to any one of the above.
When the surface of the optical filter in contact with the caulking rib is the upper surface, and the surface on the opposite side is the lower surface,
A gap is provided between the upper surface side of the outer peripheral surface of the optical filter and the surface of the caulking rib facing the upper surface side of the outer peripheral surface,
6. The lens unit according to claim 4, wherein a surface of the caulking rib facing the lower surface side of the outer peripheral surface of the optical filter protrudes to the optical filter side.
The lens unit according to any one of claims 1 to 6, wherein a tip end portion of the crimped rib after deformation is recessed in a substantially arc shape in a plan view.
A caulking jig having a caulking head for caulking the workpiece;
A caulking cradle that supports the work against the caulking head; and
When the position of the caulking jig with respect to the caulking jig is above, and the position of the caulking base with respect to the caulking jig is down,
The lower surface of the caulking head has a first caulking surface and a second caulking surface that is disposed at the center of the first caulking surface and projects downward from the first caulking surface. Caulking device to perform.
The caulking device according to claim 8, wherein a surface shape of the second caulking surface is a circular shape in a bottom view.
The caulking cradle includes a movable part that supports the workpiece, a base part that supports the movable part so as to be movable in a vertical direction, and a biasing member that biases the movable part upward. The caulking device according to claim 8 or 9, wherein the caulking device is provided.
11. The biasing member according to claim 10, wherein when the pressure applied to the workpiece from the caulking head exceeds a predetermined threshold, the movable portion is sunk to reduce the pressure. Caulking device.
The base part is a member having a substantially cylindrical tube part,
The movable part is fitted into a cylinder of the cylindrical part, and the upper part of the movable part extends above the cylindrical part,
An annular flange portion extending radially outward is formed on the upper portion of the movable portion,
The base portion has a guide pin that is a rod-like body extending above the cylindrical portion,
The caulking device according to claim 10 or 11, wherein the guide pin is inserted through a hole formed in the flange portion of the movable portion.
The caulking device according to any one of claims 8 to 12, wherein the workpiece is a holder portion of the lens unit according to any one of claims 1 to 6.