JP2003035854A - Lens barrel manufacturing method and lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a lens barrel simple in structure, reduced in thickness and easy in its manufacture by holding an optical lens by an optical diaphragm plate in the case of fixing and holding the optical lens and the optical diaphragm plate to the lens barrel. SOLUTION: In a state where the optical lens 2 is fitted to the lens chamber part 1j of the lens barrel 1 and a lens barrel receiving surface part 2a of the outer periphery part of the lens 2 is allowed to abut on and held at a fixed frame part 1a forming the chamber part 1j, the optical diaphragm plate 3 is fitted so that the plate 3 is allowed to abut on the outer periphery part of the lens 2 along a diaphragm plate fixed part 1k formed projectingly toward the inside of an optical axis 10 as the inner edge part of the inner periphery of the lens barrel 1 continuously, and then the fixed part 1k is thermally caulked toward the inner periphery side, whereby the fixed part 1k is allowed to abut on the outer periphery part of the fitted plate 3 so as to fix and hold the lens 2 and the plate 3 in the lens barrel 1. It is possible to fix and hold the plate 3 in the lens barrel 1 by any method such as using an adhesive, using a screw and press-fitting other than thermal caulking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a lens barrel for fixing an optical member and a lens barrel manufactured by the manufacturing method, and more particularly, to an optical lens using an optical diaphragm when attaching the optical lens to the lens barrel. And a lens barrel manufactured by the manufacturing method.

[0002]

2. Description of the Related Art Conventionally, various manufacturing methods have been proposed as a method for fixing an optical lens to a lens barrel forming a lens holding mechanism. For example, JP-A-9-281
In Japanese Patent No. 374, "Method for holding lens in optical system barrel, optical system barrel and optical apparatus using the same",
There is provided a means capable of holding and fixing a plurality of lenses including a plastic lens and a glass lens to a lens barrel with an adhesive without deteriorating the optical performance of the plastic lens.

Also, in Japanese Unexamined Patent Publication No. 8-179177, "Optical System Supporting Device", an optical system supporting device applicable to a laser beam printer or the like is strengthened by a UV (ultraviolet curing) adhesive and a lens is a mirror. The technique of bonding to the cylinder is used.

Japanese Patent Laid-Open No. 2000-66081 “Lens barrel” and Japanese Patent Laid-Open No. 2000-193873 “Lens barrel” disclose a method of fixing an optical lens with a screw.

Further, in Japanese Patent Laid-Open No. 11-174307, "Lens barrel", there is provided means for fixing and holding an optical lens to the barrel by using heat staking which can be assembled easily and in a short time. It is provided.

The lens fixing method disclosed in Japanese Unexamined Patent Publication No. 10-288727 "Lens barrel and repair method thereof" is also an optical system that enables lens replacement and cleaning by using a caulking method and a retaining ring method together. It is disclosed as a lens holding / fixing method.

According to Japanese Unexamined Patent Publication No. 8-201672, "Optical member fixing structure", an optical member used for attaching a lens to a lens barrel can be set with high positional accuracy.
In addition, in order to make the structure simple and easy to manufacture,
After the optical lens is brought into a state of being engaged with and brought into contact with the concave-convex surface of the fixed frame portion formed in the inner part of the lens housing portion inside the lens barrel, screw the optical lens into the lens barrel from the insertion direction of the optical lens. There is disclosed a structure in which a press ring is inserted and fixed.

Further, as an invention for fixing both the optical lens and the optical diaphragm in the lens barrel, there is disclosed in Japanese Patent Laid-Open No. 13678/1996.
In the publication No. 3 “Lens barrel manufacturing method and lens barrel and photographing device”, as a lens barrel manufacturing method in which the lens is free from scratches, dirt, dust, etc., after squeezing and holding the optical lens in the barrel, A manufacturing method has been proposed in which, instead of mounting the device on a lens barrel, first, a diaphragm device is mounted on the lens barrel body, and then the optical lens is caulked and fixed.

[0009]

However, in the prior art, when fixing the optical lens in the lens barrel, the optical lens itself is fixed by a screw, an adhesive, caulking or a retaining ring, When the optical diaphragm plate is not mounted in the lens barrel, the steps of fixing and holding the optical lens in the lens barrel and the step of fixing and holding the optical diaphragm plate in the lens barrel are performed separately in the manufacturing order. However, there is a problem in that the structure needs to be provided independently, the manufacturing process increases, the manufacturing cost increases, and the structure of the lens barrel becomes large (thick) and complicated.

The present invention has been made in view of the above problems, and an optical member (that is, an optical lens, an optical diaphragm plate) can be easily set in a lens barrel with high position accuracy and fixed, and can be manufactured. Easy, simple structure, and
It is intended to provide a lens barrel manufacturing method capable of realizing a thin lens barrel and a lens barrel using the manufacturing method.

That is, in a state where the optical lens is fitted in the optical lens chamber portion formed in the lens barrel and abuts on the fixed frame portion formed in the inner portion of the optical lens chamber portion of the lens barrel, Further, the optical diaphragm plate is fitted into the lens barrel from the same direction as the fitting direction of the optical lens, and the optical lens contact surface portion formed on the outer peripheral portion of the optical diaphragm plate and the diaphragm formed on the outer peripheral portion of the optical lens. After abutting against the plate abutting surface portion, the diaphragm plate fixing portion is formed on the inner peripheral side of the lens barrel so as to extend toward the inner side (that is, the insertion port side) as the inner peripheral inner edge portion and project. The optical lens and the optical diaphragm are fixed by using a method of fixing the optical diaphragm plate, such as caulking and press-contacting the surface of the lens barrel inner edge pressing surface portion forming the outer peripheral portion of the optical diaphragm plate, by means such as heat caulking. The plate and the optical axis in the lens barrel and in the direction perpendicular to the optical axis. To, is to fix cents.

[0012]

According to a first aspect of the present invention, there is provided a lens barrel manufacturing method for manufacturing a lens barrel having an optical diaphragm, the lens barrel holding an optical lens, wherein an optical lens chamber portion in the lens barrel is provided. In a state where the optical lens is fitted and the lens barrel receiving surface portion formed on the outer peripheral portion of the optical lens is brought into contact with and held by the fixed frame portion formed in the optical lens chamber portion of the lens barrel, the lens barrel The outer circumference of the optical lens previously held in contact with the fixed frame portion along the diaphragm plate fixing portion projecting inward as the inner peripheral inner edge portion of the optical lens. After being fitted so as to come into contact with the diaphragm plate abutting surface portion formed on the portion, the diaphragm plate fixing portion provided on the lens barrel is heat caulked toward the inner peripheral side so that the diaphragm plate is fixed. Fixed to the outer peripheral part of the optical diaphragm plate The in contact against, the optical lens and the optical diaphragm plate, and is characterized in that a lens barrel manufacturing method in which fixed and held in the lens barrel.

According to a second aspect of the present invention, there is provided a lens barrel manufacturing method for manufacturing a lens barrel having an optical diaphragm plate for holding an optical lens, wherein an optical lens is fitted into an optical lens chamber portion in the lens barrel. When the lens barrel receiving surface portion formed on the outer peripheral portion of the optical lens is held in contact with the fixed frame portion formed in the optical lens chamber portion of the lens barrel, The optical diaphragm plate is formed on the outer peripheral portion of the optical lens previously held in contact with the fixed frame portion along the diaphragm plate fixing portion that is formed to project inward as the inner peripheral edge portion. After being fitted so as to come into contact with the diaphragm plate contact surface portion, a diaphragm plate outer peripheral adhesive portion provided on the outer diameter portion of the optical diaphragm plate and a diaphragm plate adhesive portion provided on the diaphragm plate fixing portion. The optical lens and the optical lens. The academic aperture plate, is characterized in that a lens barrel manufacturing method in which fixed and held in the lens barrel.

According to a third aspect of the present invention, there is provided a lens barrel manufacturing method for manufacturing a lens barrel having an optical diaphragm plate, the lens barrel holding an optical lens, wherein an optical lens is fitted in an optical lens chamber portion in the lens barrel. When the lens barrel receiving surface portion formed on the outer peripheral portion of the optical lens is held in contact with the fixed frame portion formed in the optical lens chamber portion of the lens barrel, The optical diaphragm plate is formed on the outer peripheral portion of the optical lens, which is previously brought into contact with and held by the fixed frame portion, along the diaphragm plate guide portion which is formed to project inward as an inner peripheral edge portion. A plurality of through holes formed in the outer peripheral portion of the optical diaphragm plate after being fitted so as to come into contact with the diaphragm plate contacting surface portion, and the lens barrel formed at the same position as the through holes. Screw the diaphragm plate fixing screw into the screw hole on the diaphragm plate receiving surface of By Mel, the optical lens and the optical diaphragm plate, and is characterized in that a lens barrel manufacturing method in which fixed and held in the lens barrel.

According to a fourth aspect of the present invention, there is provided a lens barrel manufacturing method for manufacturing a lens barrel having an optical diaphragm plate for holding an optical lens, wherein an optical lens is fitted into an optical lens chamber portion in the lens barrel. When the lens barrel receiving surface portion formed on the outer peripheral portion of the optical lens is held in contact with the fixed frame portion formed in the optical lens chamber portion of the lens barrel, The optical diaphragm plate is provided along the pressing plate contact surface part that is formed to project inward as the inner peripheral edge part.
First, after being fitted so as to come into contact with the diaphragm plate contacting surface portion formed on the outer peripheral portion of the optical lens held in contact with the fixed frame portion, the diameter dimension of the pressing plate contacting surface portion is further added. By press-fitting a pressing plate having a plurality of pressing protrusions that are larger than the pressing plate, and press-contacting the optical diaphragm plate,
A method of manufacturing a lens barrel, wherein the optical lens and the optical diaphragm plate are fixedly held in the lens barrel.

A fifth aspect of the present invention is characterized in that the lens barrel is manufactured by the lens barrel manufacturing method according to any one of the first to fourth aspects.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a lens barrel manufacturing method according to the present invention, that is, an embodiment of a structure for fixing an optical member in a lens barrel will be described below with reference to the drawings. First, a first embodiment of the method of manufacturing a lens barrel according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a partial cross-sectional view showing a first embodiment in an assembled state of an optical lens fixing and holding mechanism in a lens barrel according to the present invention, in which an optical diaphragm plate that contacts an optical lens in a lens barrel is heated. This shows an example in which both the optical lens and the optical diaphragm plate are fixed in the lens barrel by fixing by caulking.

FIG. 2 is an exploded perspective view showing an example of a lens barrel in-lens optical lens fixing and holding mechanism according to the present invention. The lens barrel 1 is arranged outside the optical axis (upper right direction in FIG. 2). Then, the optical lens 2 and the optical diaphragm plate 3 are sequentially fitted into the lens barrel 1. Here, the optical diaphragm 3
Is fixed to both the outer side direction and the inner side direction of the optical axis 10, it is possible to fix it together with the optical lens 2 at a predetermined position in the lens barrel 1.

As shown in FIG. 1, the optical lens 2 has, on the outer peripheral side of the lens effective diameter, a surface facing the outer side of the optical axis 10 having a surface perpendicular to the optical axis 10 direction, that is, a lens barrel receiving surface portion 2a.
A thick optical lens outer peripheral portion having a surface facing the optical axis 10 inward direction, that is, a diaphragm plate contact surface portion 2d, and further having an optical lens outer diameter portion 2b having a curved surface parallel to the optical axis 10 direction extends. Is present. Further, a lens chamber 1j for inserting the optical lens 2 therein is formed inside the lens barrel 1 into which the optical lens 2 is fitted and held and fixed, so as to fix the optical lens 2 in the optical axis 10 direction. In addition, a fixed frame portion 1a having a surface perpendicular to the direction of the optical axis 10 and a lens chamber inner diameter portion 1b having a curved surface parallel to the direction of the optical axis 10 for guiding the insertion of the optical lens 2 are configured. .

The optical diaphragm 3 which is subsequently fitted into the optical lens 2 includes a diaphragm blade fixing portion 3a having a plurality of diaphragm blades 4 and 5 movably mounted in a direction perpendicular to the optical axis 10 direction. On the outer peripheral side of the diaphragm blade fixing portion 3a, there is a diaphragm plate outer peripheral portion 3b having a shape protruding in the outer direction of the optical axis 10 (upper right direction in FIG. 2). Aperture plate outer periphery 3b
Is an optical lens contact surface portion 3d that forms a surface facing the optical axis 10 outer direction that is perpendicular to the optical axis 10 direction, an aperture plate insertion surface portion 3i, and a surface that further faces the optical axis 10 inner direction. The lens barrel inner edge pressing surface portion 3e and the diaphragm plate outer diameter portion 3f having a curved surface parallel to the optical axis 10 direction are included.

Inside the lens barrel 1 into which the optical diaphragm plate 3 is fitted, held and fixed, in order to guide and fix the optical diaphragm plate 3 into the lens barrel 1, the inner circumference of the lens barrel 1 is set to the inner circumference side. An inner edge portion is provided with a diaphragm plate fixing portion 1k that is formed to project substantially inward toward the inner side of the optical axis 10, and further, an optical diaphragm fitted along the diaphragm plate fixing portion 1k. In order to receive the plate 3 with a predetermined clearance, a diaphragm plate receiving surface portion 1i having a surface perpendicular to the optical axis 10 direction and an aperture plate insertion inner diameter portion 1f having a curved surface parallel to the optical axis 10 direction are provided. ing.

The diaphragm plate fixing portion 1k also has a mechanism for fixing the fitted optical diaphragm plate 3 so as not to shift with respect to the inner direction of the optical axis 10. That is,
The diaphragm plate fixing portion 1k which is formed as an inner peripheral inner edge portion so as to project inward in the optical axis 10 direction has an optical axis 10 on the inner diameter side.
A fixed guide portion 1 of a diaphragm plate having a curved surface substantially parallel to the direction and capable of being caulked to an angle substantially perpendicular to the optical axis 10 side.
e, and has a curved surface (or a slightly inclined surface that becomes thinner toward the tip) on the outer peripheral side substantially parallel to the direction of the optical axis 10, and is used when caulking the diaphragm plate fixing portion 1k. It is provided with a diaphragm plate pressing portion 1h that comes into contact with a caulking tool and a diaphragm plate pressing tip portion 1g forming a tip portion of the diaphragm plate pressing portion 1h.

In various optical members having such a structure, first, the optical lens 2 is inserted into the lens chamber 1j formed in the lens barrel 1 and formed in the inner portion of the lens chamber 1j of the lens barrel 1. Fixed frame portion 1a having a surface perpendicular to the optical axis 10
Then, the lens barrel receiving surface portion 2a having a surface perpendicular to the optical axis 10 formed on the outer peripheral portion of the optical lens 2 is set in a contact state. Further, the optical diaphragm plate 3 is fitted in the lens barrel 1 from the same direction as the insertion direction of the optical lens 2, and a diaphragm plate member having a surface perpendicular to the optical axis 10 formed on the outer peripheral portion of the optical lens 2 is attached. The contact surface portion 2d is brought into contact with the optical lens contact surface portion 3d formed on the outer peripheral portion of the optical diaphragm plate 3 and having a surface perpendicular to the optical axis 10.

Thereafter, the tip portion of the diaphragm plate fixing portion 1k provided as an inner peripheral inner edge portion on the inner peripheral side of the lens barrel 1 (that is,
The portion forming the diaphragm plate fixing guide portion 1e and the diaphragm plate pressing portion 1h) is formed on the outer peripheral surface of the optical diaphragm plate 3 at an angle substantially perpendicular to the optical axis 10 by using means such as heat staking. By caulking, the diaphragm plate fixing guide portion 1e forming the diaphragm plate fixing portion 1k of the lens barrel 1 and the lens barrel inner edge pressing surface portion 3e of the optical diaphragm plate 3 are pressed against each other. Thus, the optical diaphragm 3 and the optical lens 2 are connected in the direction of the optical axis 10 and the optical axis 1.
The structure is fixed in both 0 and the vertical direction.

That is, the optical lens 2 is fixed by sandwiching the thick outer peripheral portion of the optical lens 2 by the fixed frame portion 1a of the lens barrel 1 and the optical lens contact surface portion 3d of the optical diaphragm plate 3. . On the other hand, the optical diaphragm plate 3 is sandwiched by the diaphragm plate contact surface portion 2d of the optical lens 2 and the diaphragm plate fixing guide portion 1e forming the diaphragm plate fixing portion 1k of the lens barrel 1. A diaphragm plate fixing guide portion 1e forming the diaphragm plate fixing portion 1k of the lens barrel 1.
Is caulked on the surface of the optical diaphragm plate 3 by heat caulking or the like and brought into contact with the lens barrel inner edge pressing surface portion 3e of the optical diaphragm plate 3, whereby the optical lens 2 and the optical diaphragm plate 3 are separated from each other. Within 1, the structure is fixed not only in the direction of the optical axis 10 but also in the direction perpendicular to the optical axis 10.

In this embodiment, the optical lens 2
The lens barrel receiving surface 2a of the lens barrel 1 and the fixed frame portion 1a of the lens barrel 1 are engaged in a plane, but a plurality of engaging protrusions or engaging recesses are formed on the lens barrel receiving surface 2a of the optical lens 2. Then
On the other hand, on the fixed frame portion 1a of the lens barrel 1, there are provided engaging recesses or engaging protrusions that are fitted to the plurality of engaging protrusions or engaging recesses, and the lens barrel receiver for the optical lens 2 is provided. The engaging convex portion or the concave portion on the surface portion 2a and the engaging concave portion or the convex portion on the fixed frame portion 1a of the lens barrel 1 may be engaged and engaged with each other in the optical axis 10 direction. With this structure, the lens barrel 1 and the optical lens 2 can be more accurately aligned in the radial direction.

Further, the diaphragm plate contact surface portion 2d of the optical lens 2
The optical lens abutting surface portion 3d of the optical diaphragm plate 3 is planarly engaged, but a plurality of engaging convex portions or engaging concave portions are formed on the diaphragm plate abutting surface portion 2d of the optical lens 2.
On the other hand, the optical lens abutting surface portion 3d of the optical diaphragm plate 3 is provided with an engaging concave portion or an engaging convex portion that fits into the plurality of engaging convex portions or engaging concave portions, and The engaging convex portion or the engaging concave portion on the diaphragm plate contact surface portion 2d and the engaging concave portion or the engaging convex portion on the optical lens contact surface portion 3d of the optical diaphragm plate 3 are engaged with each other in the optical axis 10 direction. The structure may be combined. With this structure, the optical lens 2 and the optical diaphragm plate 3 can be more accurately aligned in the radial direction.

Incidentally, the engagement relationship between the engagement convex portion and the engagement concave portion as described above may be formed so as to be relatively tightly fitted to each other, or in the engagement concave portion. The convex portion may be formed to be press-fitted. vice versa,
The engagement convex portion and the engagement concave portion may be formed so that there is some play in the fitting, and in such a case, the both are surely adhered by the adhesive.

Here, when the optical lens 2 made of synthetic resin such as plastic is used, it is possible to easily form a complex-shaped structure by injection molding of synthetic resin. The injection-molded synthetic resin to be the optical lens 2 is molded into the optical lens 2 and then the gate cut portion formed when cutting from the runner is
Since it is not directly related to the lens barrel manufacturing method according to the present invention, the description thereof is omitted here.

The optical lens 2 fitted in the optical lens chamber portion 1j of the lens barrel 1 has a lens barrel receiving surface portion 2 of the optical lens 2.
a and the fixed frame portion 1a of the lens barrel 1 contact each other, between the optical lens center fitting portion 2c of the optical lens 2 and the lens chamber tip portion 1c of the lens barrel 1, and the optical lens outer diameter of the optical lens 2. The optical lens 2 is inserted into the optical lens chamber portion 1j of the lens barrel 1 in a fitted state with a slight clearance between the portion 2b and the lens chamber inner diameter portion 1b of the lens barrel 1. ing.

It should be noted that the optical curved surface portion forming the curved surface of the optical lens 2 is not provided with the lens barrel receiving surface portion 2a having a surface perpendicular to the optical axis 10 formed on the outer peripheral portion of the optical lens 2. The outer peripheral side (that is, the curved surface portion existing on the outer peripheral side of the effective lens diameter of the optical lens 2) may be fixed by the marginal contact method in which the distal end of the fixed frame portion 1a of the lens barrel 1 is brought into contact. Well, of course.

The optical aperture plate 3 inserted into the lens barrel 1 following the optical lens 2 has an optical lens contact surface portion 3d of the optical aperture plate 3 and an aperture plate contact surface portion 2d of the optical lens 2. In addition to abutting, between the diaphragm plate insertion surface portion 3i of the optical diaphragm plate 3 and the diaphragm plate receiving surface portion 1i of the lens barrel 1, and between the diaphragm plate outer diameter portion 3f of the optical diaphragm plate 3 and the diaphragm plate insertion inner diameter of the lens barrel 1. The optical diaphragm plate 3 is inserted into the lens barrel 1 in a fitted state with the portion 1f with a slight clearance.

Further, in this embodiment, the optical diaphragm 3
Is a lens barrel inner edge pressing surface portion 3e formed on the outer peripheral portion of the optical diaphragm plate 3 and a diaphragm plate fixing portion 1k of the lens barrel 1 that is caulked by thermal caulking in a state substantially perpendicular to the optical axis. The diaphragm plate fixing guide portion 1e which is in contact with the diaphragm plate fixing guide portion 1e is fixed in the lens barrel 1, but the crimped diaphragm plate fixing portion 1k is a surface perpendicular to the optical axis. It may be crimped at a sharper angle than that, and only a part of the tip of the diaphragm plate fixing portion 1k may be brought into contact with and engaged with the lens barrel inner edge pressing surface portion 3e.

In the present embodiment, the diaphragm plate fixing portion 1k of the lens barrel 1 extends inwardly of the optical axis 10 over substantially the entire circumference of the inner peripheral inner edge of the lens barrel 1. Although an example in which it is extended and projected is shown, the present invention is not limited to this case. That is, in the inner peripheral inner edge portion of the lens barrel 1 only at a plurality of positions which are line-symmetrical with respect to the optical axis 10 and which have an area sufficient for fixing the optical diaphragm plate 3. A diaphragm plate fixing portion 1k for crimping is provided, and a plurality of such diaphragm plate fixing portions 1k are provided on the lens barrel inner edge pressing surface portion 3e of the optical diaphragm plate 3 by means of heat crimping or the like. It is okay to crimp.

The manufacturing method for fixing the optical lens 2 and the optical diaphragm 3 to the lens barrel 1 is as follows. First, by injection molding, a fixed frame portion 1a forming an optical lens chamber portion 1j into which the optical lens 2 is fitted, a lens chamber inner diameter portion 1b, a lens chamber distal end portion 1c, and a diaphragm for guiding the insertion of the optical diaphragm plate 3. Plate receiving surface portion 1i, diaphragm plate insertion inner diameter portion 1f,
Further, the lens barrel 1 having the diaphragm plate fixing portion 1k for pressing and fixing the optical diaphragm plate 3 fitted in the lens barrel 1 is formed.

On the other hand, when the optical lens 2 is made of synthetic resin such as plastic, injection molding
A lens curved surface that forms a lens effective diameter together with the optical lens center fitting portion 2c, a lens barrel receiving surface portion 2a that extends the lens curved surface in the direction perpendicular to the optical axis 10, and a diaphragm plate contact surface portion 2d. And a thick lens outer peripheral portion formed by the optical lens outer diameter portion 2b are formed as in the shape shown in FIG.

In this injection molding, first,
The optical lens 2 finally formed with the lens body to be the core
After being formed so as to have a shape substantially similar to the shape of, the lens body is used as an insert (material embedded in a molded product),
Furthermore, the same material may be used for the second injection molding to form a resin layer that covers almost the entire surface of the lens body to be the core.

In the second injection molding, it is not necessary to increase the thickness of the molding resin. Therefore, it is possible to prevent distortion, sink marks, warpage, etc., which occur when the resin is solidified. A highly accurate refracting surface required as an optical lens can be formed on the surface of the core lens body.

Also, with respect to the optical diaphragm 3, the diaphragm blade fixing portion 3a having the diaphragm hole 3c bored in the center and the diaphragm outer peripheral portion 3b are molded into a shape as shown in FIG. 1 by injection molding. After that, a plurality of metal diaphragm blades 4 and 5 processed by lathing or the like are attached to the optical diaphragm blade fixing portion 3a so as to be movable in parallel on the optical diaphragm plate 3. The structure of the optical diaphragm plate 3 will be described in more detail with reference to FIG. 3 described later.

The optical lens 2 manufactured in this manufacturing process
Is inserted into the optical lens chamber portion 1j of the lens barrel 1, and the optical lens outer diameter portion 2b of the optical lens 2 is inserted into the lens chamber inner diameter portion 1b of the lens barrel 1 at a constant clearance (for example, as a clearance value, H7 Optical lens 2
The lens barrel receiving surface portion 2a formed on the outer peripheral portion of the
Positioning is performed by abutting on the fixed frame portion 1a.

Further, after the optical lens 2 is fitted and engaged, the optical diaphragm plate 3 is inserted from the same insertion direction, and the diaphragm plate insertion inner diameter portion 1f of the lens barrel 1 is inserted into the diaphragm diaphragm outer diameter portion. 3f
Are engaged and engaged with each other with a constant clearance (for example, a clearance value of about H7) to form an optical lens contact surface portion 3d forming the diaphragm plate outer peripheral portion 3b of the optical diaphragm plate 3.
Is brought into contact with the diaphragm plate contact surface portion 2d of the optical lens 2 for positioning.

After the optical diaphragm plate 3 is fitted and engaged, as will be described later, a caulking tool is used to inward the optical axis 10 as the inner peripheral inner edge portion of the lens barrel 1 (that is, toward the insertion opening side of the optical diaphragm plate 3).
The diaphragm plate fixing portion 1k that is formed so as to protrude is crimped until it becomes substantially perpendicular to the direction of the optical axis 10, so that the diaphragm plate fixing guide portion 1e (or the tip thereof) that forms the diaphragm plate fixing portion 1k. Part) is brought into contact with the lens barrel inner edge pressing surface 3e of the optical diaphragm plate 3. The optical diaphragm plate 3 is fixed and held both inside the optical axis 10 and in a direction perpendicular to the optical axis 10, and further, the optical lens that is in contact with the optical diaphragm plate 3 in the optical axis 10 direction. 2 is also fixedly held in the direction of the optical axis 10 and the direction perpendicular to the optical axis 10.

In the above embodiment, the optical lens outer diameter portion 2b which is the outer peripheral portion of the optical lens 2 is separated from the inner peripheral surface of the lens chamber inner diameter portion 1b of the lens barrel 1 with a constant clearance. Since it is formed, as the optical lens 2,
Even when using synthetic resin such as plastic,
The projection length of the gate cut portion that is formed during the injection molding of the synthetic resin may be any projection length as long as it does not come into contact with the inner peripheral surface of the lens chamber inner diameter portion 1b. , The accuracy at the time of cutting the runner becomes unnecessary, and the allowable range of the cutting position can be widened.

Next, the structure of the optical diaphragm plate 3 is shown in FIG.
Will be described in detail. Here, FIG. 3 shows an example of a front view and a side sectional view of an optical diaphragm plate in the optical lens fixing and holding mechanism in the lens barrel according to the present invention.
FIG. 3A is a front view showing a state in which aperture blades are opened, and FIG. 3B is a front view showing a state in which the aperture blades are narrowed down to significantly reduce the light transmitted from the optical lens 2. Is. Further, FIG. 3C is a side sectional view of the optical diaphragm plate showing a section viewed from the arrow direction AA shown in FIG. It should be noted that in order to reduce the influence of diffraction due to the aperture shape of the diaphragm at the time of a small diaphragm and enable high resolution imaging, an ND filter (Neutral DensityF) is used.
ilter) may be attached to the diaphragm blade, but is not shown in FIG. 3 in order to simplify the description.

In FIG. 3A, the optical diaphragm plate 3 has a diaphragm blade fixing portion 3a having a diaphragm hole 3c having a predetermined diameter capable of ensuring an effective lens diameter with the optical axis 10 as a center. , An aperture plate outer peripheral portion 3b for fixing the optical aperture plate 3. Here, as shown in the side sectional view of FIG.
The optical axis has a shape projecting in the outer direction of 0 (that is, the insertion direction of the optical diaphragm plate 3 into the lens barrel 1) and serves as a surface to be brought into contact with the optical lens 2 for fixing the optical lens 2. An optical lens contact surface portion 3d forming a surface perpendicular to 10;
The optical lens contact surface portion 3d is further moved to the outer peripheral direction so that the optical axis 1
0, the respective surfaces of the diaphragm plate insertion surface portion 3i extending in the direction perpendicular to 0 are directed in the outer direction of the optical axis 10 (that is, the lens barrel 1 of the optical diaphragm plate 3).
(Insertion direction) to have. Further, the lens barrel 1 is inserted into the inner surface of the optical axis 10 (that is, the insertion port side direction of the optical diaphragm 3 into the lens barrel 1) which is the surface opposite to the diaphragm plate insertion surface portion 3i. A surface of the lens barrel inner edge pressing surface portion 3e for fixing the optical diaphragm plate 3 is formed.

Here, as described above, the optical lens contact surface portion 3d and the diaphragm plate insertion surface portion 3i are on the same plane, and the diaphragm plate insertion surface portion 3i is located on the outer peripheral side, so that the lens barrel 1 is moved to the lens barrel 1. When inserted, the optical lens contact surface portion 3d abuts on the outer peripheral portion of the optical lens 2 (that is, the diaphragm plate contact surface portion 2d on the optical lens 2 side), while the outer peripheral side is further than the diameter of the optical lens 2. The aperture plate insertion surface portion 3i located at is the lens barrel 1
It faces the diaphragm plate receiving surface portion 1i with a certain clearance.

Further, the diaphragm blades 4 and 5 are provided with elongated holes 4a and 4b and elongated hole 5 respectively so that the diaphragm blades 4 and 5 are fixed on the optical diaphragm plate 3 in a movable state.
a and 5b are bored, and the long holes 4a and 4
b and the long holes 5a and 5b are the diaphragm blade fixing portions 3 of the diaphragm plate 3.
Aperture blade bosses 3g and 3h and aperture blade bosses 3j and 3k, which are erected on a, are respectively fitted in the longitudinal direction of each slot, that is, the arrows shown in FIG. 3 (A). In this direction, the diaphragm blades 4 and 5 can move in parallel with the diaphragm blade fixing portion 3a of the optical diaphragm plate 3.

Here, the diaphragm blades 4 and 5 are respectively
Elongated holes 4d, 5d are provided and press-fitted into the drive lever bosses 6d at both ends of the drive lever 6, and the diaphragm blades are rotated according to the rotation operation of the drive lever 6 rotationally driven by an actuator (not shown). 4, 5 are slid in the directions of the arrows, that is, in the directions opposite to each other.

That is, as shown in FIG. 3A, the diaphragm blades 4 and 5 are in a fully open state, and the light incident on the diaphragm hole 3c formed in the optical diaphragm plate 3 is transmitted as it is. From the above, the diaphragm blades 4 and 5 slide in the longitudinal direction of the long holes 4a, 4b and 5a, 5b by the rotation operation of the drive lever 6 which is rotationally driven by the drive of an actuator (not shown), and further overlap each other, As it is inserted into the optical path, the aperture of the aperture hole 3c is narrowed as an aperture of the aperture blades 4c and 5c of the aperture blades 4 and 5, and as shown in FIG. The optical path that passes through the optical diaphragm plate 3 is in a state of being narrowed down to the openings formed by the diaphragm blade openings 4c and 5c.

On the other hand, when it is desired to widen the diaphragm from the state of the diaphragm blades 4 and 5 which are narrowed down as shown in FIG.
By rotating the drive lever 6 in the opposite direction by an actuator (not shown), as shown in the arrow direction of FIG. 3 (B), the diaphragm blades 4 and 5 are moved in the opposite direction to the case of FIG. 3 (A). 3 slides in the longitudinal direction of the long holes 4a, 4b and 5a, 5b, and the apertures of the aperture blades 4 and 5 formed by the aperture blade openings 4c and 5c gradually expand, resulting in the state of FIG. 3 (A). Approaching.

Such an optical diaphragm plate 3 has an outer peripheral portion 3b.
The optical lens abutting surface portion 3d and the lens barrel inner edge pressing surface portion 3e which form the above are fixedly held at a predetermined position inside the lens barrel 1, so that the optical lens 2 and the optical diaphragm plate 3 are held.
Both and will be fixedly held.

Although the diaphragm blades 4 and 5 shown in FIG. 3 show an example constituted by two diaphragm blades, the present invention is not limited to such a case, and a plurality of two or more diaphragm blades are used. The aperture blades may be configured by the aperture blades of FIG. 3, and the aperture blades not only perform the opening / closing operation by the reciprocating movement as shown in FIG. It may be a structure in which the size of is changed.

Next, in order to fix the optical diaphragm plate 3 which is fitted and engaged in the lens barrel 1 in the inner direction of the optical axis 10, the inner peripheral edge portion of the lens barrel 1 is set in the inner direction of the optical axis 10. A process of caulking the protruding diaphragm plate fixing portion 1k on the lens barrel inner edge pressing surface portion 3e of the optical diaphragm plate 3 by thermal caulking will be described with reference to FIG. FIG. 4 is a process diagram showing an example of the heat staking process according to the present invention.
The same parts as those in FIG. 3 are designated by the same reference numerals.

As shown in FIG. 4, with respect to the lens barrel 1 supported by the caulking support tool 11, the caulking tool tip portion 12a is heated by a heater.
Are pressed along the optical axis in the P direction of the arrow shown in FIG. Thus, as the inner peripheral inner edge portion of the lens barrel 1, the diaphragm plate pressing tip 1g on the outer peripheral side of the diaphragm plate fixing portion 1k formed to project inward of the optical axis 10 to the diaphragm plate pressing portion 1h,
The caulking tool tip 12a of the caulking tool 12 is formed, and the caulking tool pressing tip 12g is brought into close contact with and is pressed against the sloped surface.

Explaining in more detail, as described above,
With the optical lens 2 and the optical diaphragm plate 3 fitted and held in the lens barrel 1, by mounting the lens barrel front end 1d of the lens barrel 1 on the caulking support tool 11, The movement to the lower side (that is, the outer direction of the optical axis 10) is suppressed. Further, in such a state, the caulking tool holding tip 12g of the caulking tool 12 serves as an inner peripheral inner edge portion of the lens barrel 1 and an outer peripheral side surface of the diaphragm plate fixing portion 1k formed to project inward of the optical axis 10. Diaphragm plate holding part 1
It is arranged so as to be in close contact with the diaphragm plate pressing front end 1g which is the front end of h. That is, a force is applied to the diaphragm plate fixing portion 1k such that the diaphragm plate fixing portion 1k is pressed from the outer peripheral side toward the inner peripheral side.

The caulking tool 12 is a tool for performing thermal caulking, and the caulking tool tip 12a provided with the caulking tool holding tip 12g is such that a synthetic resin such as plastic is melted by a heater (not shown). It has been heated up to.

The caulking tool 12 is moved in the P direction shown in FIG.
Each portion in the circumferential direction of the diaphragm plate pressing tip portion 1g, which is the tip portion of the diaphragm plate pressing portion 1h forming the outer peripheral side surface of the diaphragm plate fixing portion 1k of the lens barrel 1, is held under pressure for a predetermined time. To
Pressure is evenly applied by the inclined surface of the caulking tool pressing tip portion 12g of the caulking tool 12. Aperture plate retainer tip 1g
Along the inclined surface of the caulking tool pressing tip 12g,
From the outer circumference side to the inner circumference side, it is crimped evenly,
Next, the diaphragm plate pressing tip 1g is brought into close contact with the caulking tool tip return portion 12e having an inclined surface in the opposite direction to the caulking tool pressing tip 12g, whereby the diaphragm plate fixing portion 1
The diaphragm plate pressing portion 1h forming the outer peripheral side surface of k is
The caulking is performed uniformly toward the inner peripheral side up to a position perpendicular to the optical axis direction.

Then, finally, the diaphragm plate fixing guide portion 1e forming the inner peripheral side surface of the diaphragm plate fixing portion 1k is pressed against the lens barrel inner edge pressing surface portion 3e of the diaphragm plate 3. When the optical diaphragm plate 3 comes into contact with the flat surface,
The optical lens 2 which is completely fixed with respect to the 0 direction and the direction perpendicular to the optical axis 10 and is further held in contact with the optical diaphragm plate 3 is also perpendicular to the optical axis 10 in the optical axis 10 direction. It will be completely fixed in all directions. The example in which the diaphragm plate fixing guide portion 1e comes into planar contact with the lens barrel inner edge pressing surface portion 3e of the diaphragm plate 3 has been described, but as described above, the present invention is not limited to this case, and the diaphragm plate fixing portion 1k is not limited thereto. Of course, it is also possible to fix the optical diaphragm plate 3 by bringing only the inner peripheral end portion into contact with the lens barrel inner edge pressing surface portion 3e of the diaphragm plate 3.

Further, when heat caulking is performed, the lens barrel inner edge pressing surface portion 3 of the diaphragm plate outer peripheral portion 3b forming the outer peripheral portion protruding toward the outer side of the optical axis 10 of the optical diaphragm plate 3.
In order to bring the diaphragm plate fixed guide portion 1e into planar contact with the e, a constant pressure is also applied from the caulking tool 12 to the optical diaphragm plate 3 via the diaphragm plate fixed guide portion 1e. However, as described above, from the caulking tool 12, a uniform pressure is indirectly applied to each part in the circumferential direction of the lens barrel inner edge holding surface 3e on the outer peripheral side of the optical diaphragm plate 3. In addition, since no pressure is applied to the diaphragm blade fixing portion 3a itself formed on the inner peripheral side of the optical diaphragm plate 3, it causes a problem for the diaphragm operation of the optical diaphragm plate 3. It does not happen.

As a constituent material of the lens barrel 1 to which the heat staking is applied, it is naturally preferable to use a resin material suitable for the heat staking. For example, polycarbonate,
Various resin materials such as polypropylene, polyethylene, polystyrene, polymethylmethacrylate, and polyvinyl chloride are preferable, and when such a resin material is used, it is preferable to use a resin material having a thermal deformation starting temperature of about 120 to 140 ° C.

Further, as the conditions for the heat crimping, the shapes of the crimping tool holding tip portion 12g and the crimping tool tip returning portion 12e of the crimping tool 12 are arranged so that the diaphragm plate fixing portion 1k of the lens barrel 1 is evenly arranged in the circumferential direction. It is necessary to have an accuracy such that the caulking tool can be pressed.
If the temperature for heating g and the caulking tool tip return portion 12e by the heater is usually about 190 to 230 ° C., the diaphragm plate fixing portion 1k of the lens barrel 1 for about 5 to 15 seconds.
Is preferably heated under pressure.

In this embodiment, as the crimping method, the heat crimping with the heater is used, but the invention is not limited to such a case, and for example, ultrasonic crimping may be used.

Next, a second embodiment of the method of manufacturing a lens barrel according to the present invention will be described with reference to FIG. Here, FIG. 5 is a partial cross-sectional view showing a second embodiment in an assembled state relating to the optical lens fixing and holding mechanism in the lens barrel according to the present invention, in which an optical diaphragm plate contacting the optical lens is bonded in the lens barrel. It shows an example in which both the optical lens and the optical diaphragm are fixed in the lens barrel by being fixed to the lens barrel with an agent. 5, the same parts as those in FIG. 1 are designated by the same reference numerals as those in FIG. That is, FIG.
1 has substantially the same structure as that of FIG. 1, and a different part from FIG. 1 is the diaphragm plate outer diameter portion 3f of the optical diaphragm plate 3.
1 and the diaphragm plate fixing portion 1k of the lens barrel 1, and the other parts have the same structure as in FIG. Below, it demonstrates centering on the part which becomes a structure different from FIG.

That is, in FIG. 5, the diaphragm plate fixing portion 1l of the lens barrel 1 into which the optical diaphragm plate 3 is fitted has the diaphragm plate receiving surface portion 1i and the diaphragm plate for heat caulking as in the case of FIG. A diaphragm plate is fixed without a holding portion 1h and a diaphragm plate pressing tip portion 1g, and instead, an adhesive 7 is inserted to form a diaphragm plate bonding portion 1m for fixing the optical diaphragm plate 3 Is provided with a protrusion. On the other hand, the optical diaphragm plate 3 has a diaphragm plate outer peripheral bonding portion 3m for inserting the adhesive 7 on the surface forming the outer diameter portion of the optical diaphragm plate 3 and fixing it to the lens barrel 1. ing.

In the manufacturing process of such a lens barrel 1, as in the case of FIG. 1, first, the optical lens 2 is fitted into the lens barrel 1 and the lens barrel receiving surface portion 2a forming the outer peripheral portion of the optical lens 2.
Is the fixed frame portion 1 forming the lens chamber portion 1j of the lens barrel 1.
In the state of being brought into contact with a, the optical diaphragm plate 3 is further fitted along the diaphragm plate fixing portion 1l of the lens barrel 1, and the diaphragm peripheral portion 3
The optical lens contact surface portion 3d forming b is brought into contact with the diaphragm plate contact surface portion 2d forming the outer peripheral portion of the optical lens 2.

In this state, as in the case of FIG. 1, between the lens chamber tip portion 1c of the lens barrel 1 and the optical lens center fitting portion 2c of the optical lens 2, and the lens chamber inner diameter portion of the lens barrel 1. A certain small clearance is provided between 1b and the optical lens outer diameter portion 2b of the optical lens 2, and the optical lens 2 is fitted in the optical lens chamber portion 1j of the lens barrel 1. .

Further, the diaphragm plate insertion surface portion 3i of the optical diaphragm plate 3
Has a clearance between the diaphragm plate receiving surface 1i of the lens barrel 1 and the adhesive so that the adhesive does not flow in, but the end of the diaphragm plate outer peripheral bonding portion 3m forming the outer diameter portion of the optical diaphragm plate 3. The diaphragm plate insertion surface portion 3 is provided at (the end portion of the optical axis 10 in the outward direction).
A taper portion 3n for preventing the adhesive from flowing into i is also provided.

In a state where the optical lens 2 and the optical diaphragm plate 3 are fitted in the lens barrel 1, the adhesive 7 is applied to the diaphragm plate adhesive portion 1m forming the diaphragm plate fixing portion 1l of the lens barrel 1 and the optical diaphragm plate. The lens barrel 1 and the optical diaphragm plate 3 are adhered to each other by injecting them into the gap between the diaphragm plate outer peripheral adhesion portion 3m. Thus, the optical diaphragm 3
However, by being fixedly held at a predetermined position in the lens barrel 1, both the optical lens 2 and the optical diaphragm plate 3 are fixedly held in the lens barrel 1.

It should be noted that the joints between the diaphragm plate adhesive portion 1m of the lens barrel 1 and the diaphragm plate outer peripheral adhesive portion 3m of the optical diaphragm plate 3 are not uniformly and uniformly adhered in the entire circumferential direction, and are not specified. It is also possible to bond only a plurality of places. In such a case, if a uniform adhesive area is given to the adhesive portion that is line-symmetrical with respect to the optical axis 10, it is possible to further reduce the blurring of the optical axis 10 during thermal expansion and contraction. The coaxiality of the shaft can be maintained.

As the adhesive 7, it is preferable to use an adhesive material having a thermal expansion and contraction coefficient substantially equal to those of the lens barrel 1 and the optical diaphragm plate 3, such as polyvinyl chloride made of the same material as that of the lens barrel. It is preferable to use polyester or the like. Further, when the thermal expansion coefficient of the lens barrel 1 and the optical diaphragm plate 3 are largely different, as the adhesive agent 7, an elastic adhesive agent such as EP-001 (manufactured by Cemedine Co., Ltd.), which has elastic properties when cured, is used. If it is used, it is possible to prevent deformation of the optical system due to heat or the like.

Next, a third embodiment of the method of manufacturing a lens barrel according to the present invention will be described with reference to FIG. FIG. 6 is a partial cross-sectional view showing a third embodiment of the assembled state of the optical lens fixing and holding mechanism in the lens barrel according to the present invention, in which the optical diaphragm plate that contacts the optical lens in the lens barrel is mirrored. This shows an example in which both the optical lens and the optical diaphragm are fixed in the lens barrel by screwing and fixing them to the barrel. 6, the same parts as those in FIG. 1 are designated by the same reference numerals as those in FIG. That is, FIG.
1 has substantially the same structure as that of FIG. 1, and the parts different from FIG. 1 are the diaphragm plate fixing portion 1k, the diaphragm plate receiving surface portion 1i, and the diaphragm outer peripheral portion 3b of the optical diaphragm plate 3 in the lens barrel 1. Only the structure is provided, and the other parts have the same structure as that shown in FIG. Below, it demonstrates centering on the part which becomes a structure different from FIG.

That is, in FIG. 6, the diaphragm plate guide portion 1p of the lens barrel 1 into which the optical diaphragm plate 3 is fitted has the diaphragm plate receiving surface portion 1i for performing heat staking and the diaphragm plate as in the case of FIG. The holding portion 1h and the diaphragm plate holding tip portion 1g are not provided, and in order to simply guide the optical diaphragm plate 3 to the mounting position in the lens barrel 1, it is provided on the inner peripheral side of the lens barrel 1. The inner peripheral inner edge portion is formed so as to project inward of the optical axis 1, and the inner peripheral side diaphragm plate insertion inner diameter portion 1f forming the diaphragm plate guide portion 1p and the diaphragm plate of the optical diaphragm plate 3 are formed. A fixed clearance is provided between the outer diameter portion 3f and the outer diameter portion 3f.

On the other hand, the diaphragm plate fixing screw 8 is provided on the diaphragm plate outer peripheral portion 3b of the optical diaphragm plate 3 with the elastic members 9a and 9b made of, for example, urethane rubber interposed therebetween so as to receive the diaphragm plate of the lens barrel 1. A bracket insertion hole 3r for screwing into the surface portion 1q is penetrated and punched. That is, a screw-threaded bracket 8 that is screwed with the screw-threaded portion 8a of the diaphragm plate fixing screw 8.
A bracket insertion hole 3r for inserting b is bored in the direction parallel to the optical axis 10 from the surface of the screw receiving surface portion 3p to the diaphragm plate insertion surface portion 3q.

Further, in the diaphragm plate receiving surface portion 1q of the lens barrel 1,
At the same position as the bracket insertion hole 3r of the optical diaphragm plate 3 facing each other, a bracket insertion hole 1r for inserting the tip end portion of the screw-threaded bracket 8b is formed, and the bracket insertion hole 1r is provided with the bracket insertion hole 1r. The tip portion of the screw-threaded bracket 8b, which is press-fitted through the bracket insertion hole 3r, which is a through-hole provided in the diaphragm plate 3, is press-fitted and fixed.

Thus, the screw threaded portion 8a of the diaphragm plate fixing screw 8 is connected to the screw threaded bracket 8b mounted on the optical diaphragm plate 3 through the through hole formed in the elastic member 9a. While being screwed, the screw-threaded bracket 8 mounted on the lens barrel 1 arranged via the elastic member 9b.
The optical diaphragm plate 3 is fixedly held on the lens barrel 1 in the direction of the optical axis 10 and in the direction perpendicular to the optical axis 10 by being screwed with the tip portion of b.

In the manufacturing process of such a lens barrel 1, first, as in the case of FIG. 1, the optical lens 2 is fitted into the lens barrel 1 and the lens barrel receiving surface portion 2a forming the outer peripheral portion of the optical lens 2.
Is the fixed frame portion 1 forming the lens chamber portion 1j of the lens barrel 1.
In the state of being brought into contact with a, the optical diaphragm plate 3 is further fitted along the diaphragm plate guide portion 1p of the lens barrel 1, and the diaphragm peripheral portion 3
The optical lens contact surface portion 3d forming b is brought into contact with the diaphragm plate contact surface portion 2d forming the outer peripheral portion of the optical lens 2.

In this state, as in the case of FIG. 1, between the lens chamber tip portion 1c of the lens barrel 1 and the optical lens center fitting portion 2c of the optical lens 2, and the lens chamber inner diameter portion of the lens barrel 1. A certain small clearance is provided between 1b and the optical lens outer diameter portion 2b of the optical lens 2, and the optical lens 2 is fitted in the optical lens chamber portion 1j of the lens barrel 1. .

Further, the diaphragm plate outer diameter portion 3f of the optical diaphragm plate 3
A certain clearance is also provided between the optical aperture plate 3 and the aperture plate insertion inner diameter portion 1f of the lens barrel 1, so that the optical aperture plate 3 is fitted into the lens barrel 1. The position of the bracket insertion hole 3r on the diaphragm plate insertion surface portion 3q is held at a position that coincides with the elastic member 9b affixed in advance on the bracket insertion hole 1r formed in the diaphragm plate receiving surface portion 1q of the lens barrel 1. While being closely attached to the elastic member 9b,
The optical diaphragm plate 3 is fitted into the lens barrel 1 such that the diaphragm plate insertion surface portion 3q of the optical diaphragm plate 3 is arranged to face the diaphragm plate receiving surface portion 1q of the lens barrel 1.

In a state where the optical lens 2 and the optical diaphragm plate 3 are fitted in the lens barrel 1, first, the screw receiving surface portion 3p of the optical diaphragm plate 3 is inserted into the bracket insertion hole 3r penetrating the diaphragm plate insertion surface portion 3q. The screw-threaded bracket 8b is press-fitted and penetrated, and further, the bracket insertion hole 1 of the diaphragm plate receiving surface portion 1q of the lens barrel 1 arranged to face the diaphragm plate insertion surface portion 3q.
Press in and fix to r.

Thereafter, the screw-threaded portion 8a of the diaphragm plate fixing screw 8 having the elastic member 9a mounted on the head is screwed into the screw-threaded bracket 8b, and the screw-threaded bracket 8 is attached.
When the tip portion of the screw threaded portion 8a comes into contact with the bottom portion of b, the elastic members 9a, 9a are secured by appropriate tightening strength.
and b are compressed, and the optical diaphragm plate 3 is fixed and attached to the lens barrel 1. Thus, the optical diaphragm 3
By being fixedly held at a predetermined position in the lens barrel 1, both of the optical lens 2 and the optical diaphragm plate 3 are oriented with respect to the direction of the optical axis 10 and the direction perpendicular to the optical axis 10. It will be fixedly held inside.

The bracket insertion holes 3r and 1r formed in the optical aperture plate 3 and the lens barrel 1 are provided in the optical axis 1 respectively.
Although it will be arranged at a plurality of specific locations at equal diameter intervals from 0, in such a case, the screw threaded brackets 8b having the same size are attached to the portions which are line-symmetrical with respect to the optical axis 10 as the center. If it can be mounted by pressure, it is possible to further reduce the deviation of the optical axis, and it is possible to maintain the coaxiality of the optical axis.

Further, in the present embodiment, although the screw screwing bracket 8b for screwing with the screw is provided, the present invention is not limited to this case. That is, the lens barrel 1 and the optical diaphragm plate 3 are connected to each other by the screw-engaging portion 8 of the diaphragm plate fixing screw 8.
When it is made of a synthetic resin material having sufficient rigidity to be screwed into and fixed to the screw thread of a, the diaphragm plate receiving surface portion 1q of the lens barrel 1 and the diaphragm plate outer peripheral portion 3 of the optical diaphragm plate 3 are directly connected.
It is also possible to provide b with a screw thread to be screwed with the screw thread of the screw screwing portion 8a of the diaphragm plate fixing screw 8.

Next, a fourth embodiment of the method of manufacturing a lens barrel according to the present invention will be described with reference to FIGS. Here, FIG. 7 is a manufacturing process diagram showing, together with a press-fitting holding tool, a partial cross-sectional view showing a fourth embodiment in an assembled state relating to a lens barrel internal optical lens fixing and holding mechanism according to the present invention. An example is shown in which both the optical lens and the optical diaphragm plate are fixed in the lens barrel by further press-fitting and fixing the pressing plate on the optical diaphragm plate that contacts the optical lens in the cylinder. is there. 7, the same parts as those in FIG. 1 are designated by the same reference numerals as those in FIG. 1, but the structures of the lens barrel 1, the optical lens 2 and the optical diaphragm plate 3 are substantially the same as those in FIG. is doing.

The part different from FIG. 1 is the lens barrel 1 in FIG.
1 is only the structure of the diaphragm plate fixing portion 1k in FIG. 1, and as in the case of FIG. 1, the diaphragm plate receiving surface portion 1 for performing heat caulking.
i, the diaphragm plate pressing portion 1h and the diaphragm plate pressing tip portion 1g are not provided, and a guide for inserting the optical diaphragm plate 3 to the mounting position in the lens barrel 1 is provided, and a press member that is subsequently pressed in is provided. Pressing plate protrusion 14b of plate 14
Pressing plate holding part 1s forming pressing plate contact surface part 1t for press-fitting to a predetermined position while abutting
Is formed so as to project inwardly of the optical axis 10 as an inner peripheral inner edge portion. Further, FIG. 7 also shows a holding plate 14 that is press-fitted into the lens barrel 1 after the optical diaphragm plate 3 is fitted in to fix the optical diaphragm plate 3.

FIG. 8 is a perspective view of the pressing plate 14 used at the time of press-fitting in FIG. 7, showing the structure of the pressing plate 14 which is pressed against the optical diaphragm plate 3. In the following, a manufacturing method of fixing the optical lens 2 and the optical diaphragm plate 3 at a predetermined position in the lens barrel 1 by press-fitting the pressing plate 14 will be described with reference to FIGS. 7 and 8.

In FIG. 7, a constant clearance is provided between the inner peripheral pressing plate contact surface portion 1t forming the pressing plate holding portion 1s and the diaphragm plate outer diameter portion 3f of the optical diaphragm plate 3. Although provided, the pressing plate protrusion 1 of the pressing plate 14
Since the inner diameter of the pressing plate contact surface portion 1t is slightly smaller than the outer diameter of 4b, the pressing plate protrusion 14b is inserted while being pressed against the pressing plate contact surface portion 1t.

Further, as shown in FIG.
The pressing hole 14c having a diameter slightly larger than the diameter of the aperture hole 3c formed in the optical aperture plate 3 is bored through the central portion around the optical axis 10.
That is, the pressing hole 14c has a diameter dimension that ensures the lens effective diameter of the optical lens 2 and the maximum aperture diameter of the optical diaphragm plate 3.

Further, the lens barrel 1 is attached to the outer peripheral portion of the pressing plate 14.
Is provided with a plurality of pressing plate guide portions 14a which are slightly smaller than the inner diameter of the pressing plate abutting surface portion 1t and serve as guides when the pressing plate 14 is press-fitted. Between the portions 14a, the holding plate protrusion 1 is slightly larger than the inner diameter of the holding plate contact surface portion 1t and is inclined at an angle in the direction opposite to the press-fitting direction.
4b is provided.

In this embodiment, as the pressing plate 14, a metal plate is used, and the pressing hole 14c, the pressing plate guide portion 14a, and the pressing plate protrusion 14b have the same optical axis coaxiality and roundness. The case where high-precision press working is performed so that it can be sufficiently maintained is shown. However, when such a metal plate is used, it is desirable to perform matting treatment by black plating. It should be noted that depending on the precision, if a synthetic resin such as plastic having elasticity is used in place of the metal plate and mold molding is performed, it is possible to form a pressing plate having sufficient elasticity. .

In the manufacturing process of the lens barrel 1, as in the case of FIG. 1, first, the optical lens 2 is fitted into the lens barrel 1 to form the outer peripheral portion of the optical lens 2, and the lens barrel receiving surface portion 2a.
Is the fixed frame portion 1 forming the lens chamber portion 1j of the lens barrel 1.
In the state of being brought into contact with a, the optical diaphragm plate 3 is further fitted along the pressing plate contact surface portion 1t of the lens barrel 1, and the optical lens contact surface portion 3d forming the diaphragm plate outer peripheral portion 3b is inserted. , And is brought into contact with the diaphragm plate contact surface portion 2d forming the outer peripheral portion of the optical lens 2.

In this state, as in the case of FIG. 1, between the lens chamber tip portion 1c of the lens barrel 1 and the optical lens center fitting portion 2c of the optical lens 2, and the lens chamber inner diameter portion of the lens barrel 1. A certain small clearance is provided between 1b and the optical lens outer diameter portion 2b of the optical lens 2, and the optical lens 2 is fitted in the optical lens chamber portion 1j of the lens barrel 1. . Further, the diaphragm plate outer diameter portion 3f of the optical diaphragm plate 3
Also, a certain clearance is provided between the lens barrel 1 and the aperture plate insertion inner diameter portion 1f of the lens barrel 1, and the optical aperture plate 3 is fitted into the lens barrel 1.

The lens barrel 1 in which the optical lens 2 and the optical diaphragm plate 3 are fitted in the lens barrel 1 is shown in FIG.
The lens barrel front end 1d of the lens barrel 1 is mounted on the holding support 13b of the holding tool 13 to fix the lens barrel 1. Next, the pressing plate protruding portion 14b of the pressing plate 14 is disposed above the pressing plate contacting surface portion 1t of the lens barrel 1 with its center aligned with the optical axis 10.

Then, the holding head 13c, which is vertically movable by the holding handle 13d arranged directly above the lens barrel 1 and the holding plate 14, is lowered to move the holding plate 1
Only 4 is press-fitted along the pressing plate contact surface portion 1t of the lens barrel 1. Here, the lower surface of the holding head 13c has an outer diameter dimension slightly smaller than the diameter dimension of the holding plate guide portion 14a of the holding plate 14, and is slightly larger than the diameter dimension of the holding hole 14c of the holding plate 14. It has a large-diameter hollow portion, and has a structure in which only the root portion of the inclined portion of the pressing projection 14b of the pressing plate 14 is pressed.

Lower the pressing handle 13d,
When the pressing stopper 13e provided on the pressing handle 13d contacts the pressing arm 13a,
The press fitting of the pressing plate 14 is completed. Here, the mounting positions of the pressing stopper 13e with respect to the pressing handle 13d are the diaphragm blade fixing portion 3a of the optical diaphragm plate 3 and the pressing plate 1.
It is adjusted so that it is advanced and stopped until it is slightly pressed down from the position where 4 and 4 come into contact with each other.

The pressing stopper 13e is the pressing arm 13
When it comes into contact with a, the diaphragm blade fixing portion 3a of the optical diaphragm plate 3 and the pressing plate 14 are pressed against each other with a predetermined pressing force, and by the pressing protrusion 14b of the pressing plate 14 having elasticity. The holding plate 14 is fixed to the holding plate contact surface portion 1t of the lens barrel 1. Thus, the optical diaphragm plate 3 is fixedly held at a predetermined position in the lens barrel by the pressing plate 14, so that both the optical lens 2 and the optical diaphragm plate 3 are moved in the direction of the optical axis 10 and the optical axis. It is fixed and held in the lens barrel 1 with respect to the direction perpendicular to the axis 10.

As illustrated in each of the above embodiments,
As a method of fixing and holding the optical member in the lens barrel in the lens barrel manufacturing method according to the present invention, the optical lens itself is provided by bringing the outer peripheral portion of the optical diaphragm plate into contact with the thick outer peripheral portion. There is no need to take measures to fix it,
It is only necessary to fix the optical diaphragm plate. Furthermore, it is possible to realize a manufacturing method that does not impair the optical performance of the optical lens without causing unnecessary pressure to deform the optical lens or imparting unnecessary stress. In addition, it is possible to form a thin lens barrel with a simple structure, and the lens barrel is easily manufactured.

[0097]

According to the lens barrel manufacturing method of the present invention and the lens barrel using the lens barrel manufacturing method, the outer peripheral portion of the optical diaphragm plate fitted in the lens barrel is connected to the optical lens. By making contact with the thick outer peripheral portion of the optical lens, it is not necessary to fix the optical lens itself, and only the optical diaphragm plate is fixed and held in the lens barrel. It is good, without applying unnecessary pressure to the optical lens to deform it or giving unnecessary stress,
It is possible to realize a lens barrel manufacturing method that does not impair the optical performance of the optical lens.

Further, it is not necessary to fix the optical lens and the optical diaphragm plate in the lens barrel in separate steps, and they can be fixed in the lens barrel in the same step at the same time. While reducing the manufacturing cost of the lens barrel,
It is possible to facilitate the manufacture of the lens barrel.

Furthermore, it is possible to provide a lens barrel having a simple and thin structure without affecting the operation of the diaphragm blades of the optical diaphragm plate.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing a first embodiment in an assembled state of an optical lens fixing and holding mechanism in a lens barrel according to the present invention.

FIG. 2 is an exploded perspective view showing an example of a lens barrel optical lens fixing and holding mechanism according to the present invention.

FIG. 3 is a diagram showing an example of a front view and a side sectional view of an optical diaphragm plate in an optical lens fixing and holding mechanism in a lens barrel according to the present invention.

FIG. 4 is a process drawing showing an example of the heat staking process in the present invention.

FIG. 5 is a partial cross-sectional view showing a second embodiment in an assembled state regarding a lens barrel optical lens fixing and holding mechanism according to the present invention.

FIG. 6 is a partial cross-sectional view showing a third embodiment in an assembled state regarding a lens barrel optical lens fixing / holding mechanism according to the present invention.

FIG. 7 is a manufacturing process diagram showing, together with a press-fitting holding tool, a partial cross-sectional view showing a fourth embodiment of an assembled state of a lens barrel optical lens fixing and holding mechanism according to the present invention.

8 is a perspective view of a pressing plate used at the time of press fitting in FIG. 7. FIG.

[Explanation of Codes] 1 ... Lens barrel, 1a ... Fixed frame portion, 1b ... Lens inner diameter portion, 1
c ... Lens chamber tip, 1d ... Lens barrel front end, 1e ... Diaphragm plate fixed guide section, 1f ... Diaphragm plate insertion inner diameter section, 1g ... Diaphragm plate pressing tip section, 1h ... Diaphragm plate pressing section, 1i ... Diaphragm plate Receiving surface part, 1j ... Optical lens chamber part, 1k ... Diaphragm plate fixing part,
1l ... diaphragm plate fixing portion, 1m ... diaphragm plate adhesive portion, 1p ... diaphragm plate guide portion, 1q ... diaphragm plate receiving surface portion, 1r ... bracket insertion hole, 1s ... pressing plate holding portion, 1t ... pressing plate contact surface portion, 2 ... optical lens, 2a ... lens barrel receiving surface portion, 2b ... optical lens outer diameter portion, 2c ... optical lens center fitting portion, 2d ... diaphragm plate contact surface portion, 3 ... diaphragm plate, 3a ... diaphragm blade fixing portion, 3
b ... diaphragm outer peripheral part, 3c ... diaphragm hole, 3d ... optical lens contact surface part, 3e ... lens barrel inner edge pressing surface part, 3f ... diaphragm plate outer diameter part, 3g, 3h ... diaphragm blade boss, 3i ... diaphragm plate Insertion surface part, 3j, 3k ... Diaphragm blade boss, 3m ... Diaphragm plate outer peripheral adhesion part, 3n ... Tapered part, 3p ... Screw receiving surface part, 3q ...
Diaphragm plate insertion surface portion, 3r ... Bracket insertion hole, 4, 5 ... Diaphragm blade, 4a, 4b ... Long hole, 4c ... Diaphragm blade opening portion, 4
d ... long holes, 5a, 5b ... long holes, 5c ... diaphragm blade opening,
5d ... elongated hole, 6 ... drive lever, 6d ... drive lever boss,
7 ... Adhesive agent, 8 ... Screw for fixing diaphragm plate, 8a ... Screw threaded portion, 8b ... Screw threaded bracket, 9a, 9b ... Elastic member, 10 ... Optical axis, 11 ... Caulking support tool, 12 ... Caulking tool, 12a ... Caulking tool tip portion, 12e ... Caulking tool tip return portion, 12g ... Caulking tool holding tip portion, 13 ...
Holding tool, 13a ... Holding arm, 13b ... Holding support, 13c ... Holding head, 13d ... Holding handle,
13e ... Press stopper, 14 ... Press plate, 14a ... Press plate guide part, 14b ... Press plate projection part, 14c ... Press hole.

Claims (5)

[Claims] 1. A lens barrel manufacturing method for manufacturing a lens barrel that holds an optical lens, comprising an optical diaphragm plate, wherein an optical lens is fitted into an optical lens chamber portion inside the lens barrel, and an optical lens chamber of the lens barrel is provided. In a state where the lens barrel receiving surface portion formed on the outer peripheral portion of the optical lens is brought into contact with and held by the fixed frame portion formed on the inner portion, the inner peripheral inner surface of the lens barrel is directed toward the inner side as the inner peripheral inner edge portion. Along the projecting diaphragm plate fixing portion, the optical diaphragm plate is brought into contact with the diaphragm plate abutting surface portion formed on the outer peripheral portion of the optical lens which is previously held in contact with the fixing frame portion. After being fitted so as to be in contact with each other, by heat caulking the diaphragm plate fixing portion provided in the lens barrel toward the inner peripheral side, with respect to the outer peripheral portion of the fitted optical diaphragm plate, Abutting the diaphragm plate fixing part, the optical lens and the A method of manufacturing a lens barrel, comprising: holding an optical diaphragm plate fixedly in the lens barrel. 2. A lens barrel manufacturing method for manufacturing a lens barrel holding an optical lens, comprising an optical diaphragm plate, wherein an optical lens is fitted into an optical lens chamber portion inside said lens barrel, and an optical lens chamber of said lens barrel is fitted. In a state where the lens barrel receiving surface portion formed on the outer peripheral portion of the optical lens is brought into contact with and held by the fixed frame portion formed on the inner portion, the inner peripheral inner surface of the lens barrel is directed toward the inner side as the inner peripheral inner edge portion. Along the projecting diaphragm plate fixing portion, the optical diaphragm plate is brought into contact with the diaphragm plate abutting surface portion formed on the outer peripheral portion of the optical lens which is previously held in contact with the fixing frame portion. After fitting so as to be in contact with each other, the diaphragm plate outer peripheral adhesive portion provided with the outer diameter portion of the optical diaphragm plate and the diaphragm plate adhesive portion provided with the diaphragm plate fixing portion are bonded with an adhesive. , The optical lens and the optical diaphragm plate in the lens barrel A method of manufacturing a lens barrel, which is characterized in that the lens barrel is fixedly held. 3. A lens barrel manufacturing method for manufacturing a lens barrel that holds an optical lens, comprising an optical diaphragm plate, wherein an optical lens is fitted into an optical lens chamber portion inside the lens barrel, and an optical lens chamber of the lens barrel is fitted. In a state where the lens barrel receiving surface portion formed on the outer peripheral portion of the optical lens is brought into contact with and held by the fixed frame portion formed on the inner portion, the inner peripheral inner surface of the lens barrel is directed toward the inner side as the inner peripheral inner edge portion. The optical diaphragm plate with a diaphragm plate contacting portion formed on the outer peripheral portion of the optical lens previously contacted and held by the fixed frame portion along a diaphragm plate guide portion that is formed so as to project. After being fitted so as to be in contact with each other, a plurality of through holes formed in the outer peripheral portion of the optical diaphragm plate and screws of the diaphragm plate receiving surface portion of the lens barrel formed at the same position as the through holes. By screwing the aperture plate fixing screw into the hole, A method for manufacturing a lens barrel, wherein the optical lens and the optical diaphragm plate are fixedly held on the lens barrel. 4. A lens barrel manufacturing method for manufacturing a lens barrel that holds an optical lens, comprising an optical diaphragm plate, wherein an optical lens is fitted into an optical lens chamber portion inside the lens barrel, and the optical lens chamber of the lens barrel is fitted. In a state where the lens barrel receiving surface portion formed on the outer peripheral portion of the optical lens is brought into contact with and held by the fixed frame portion formed on the inner portion, the inner peripheral inner surface of the lens barrel is directed toward the inner side as the inner peripheral inner edge portion. The optical diaphragm plate along the pressing plate contacting surface portion formed so as to project with the diaphragm plate contacting surface portion formed on the outer peripheral portion of the optical lens previously contacted and held by the fixed frame portion. After fitting so as to make contact, further press-fitting a pressing plate having a plurality of pressing projections larger than the diameter dimension of the pressing plate contacting surface portion, and press-contacting with the optical diaphragm plate, The optical lens and the optical diaphragm plate, A method of manufacturing a lens barrel, which comprises fixing and holding the lens barrel. 5. A lens barrel manufactured by the lens barrel manufacturing method according to any one of claims 1 to 4.