JPH0854552A - Lens holder - Google Patents

Abstract

PURPOSE:To provide a lens holder which does not require to divide a metallic mold for molding (top) into two at the position of an annular projected part engaged with the outer peripheral part of the rear end face of a front lens and the outer peripheral part of the front end face of a rear lens. CONSTITUTION:In the lens holder 11, a 1st lens fitting part 13 where three projected parts 12 engaged with the outer peripheral part of the rear end face of the front lens and the outer peripheral part of the front end face of the rear lens are formed on the inner peripheral surface of the holder at every other 60 deg. and which is fitted on the outer peripheral surf ace of the front lens, and a 2nd lens fitting part 15 fitted on the outer peripheral surface of the rear lens are arranged at specified intervals in the peripheral direction. Therefore, even when the metallic mold has non-divided structure, it is drawn to the forward side of the lens holder, so that misalignment between the mold and the shaft center of the holder on the forward side is not caused.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens holder used for optical equipment and the like, and more particularly to a lens holder having a structure suitable for manufacturing by a molding method such as injection molding or die casting of synthetic resin.

[0002]

2. Description of the Related Art A typical example of a known lens holder used in an optical device such as a camera will be described with reference to FIG.

As shown in the figure, a plurality of lenses L1 and L2 are arranged in a conventional lens holder 1 at predetermined intervals in the optical axis direction, and are arranged close to each other. Between the pair of lenses L1 and L2,
An annular projection 2 is formed on the inner peripheral surface of the lens holder 1 and engages with the outer peripheral edge portions of the end surfaces of the two lenses which face each other, and the front end 2a of the annular projection 2 is provided with the front lens L1. The outer peripheral edge of the rear end surface is in contact with the rear end surface 2b of the annular projection 2, and the outer peripheral edge of the front end surface of the rear lens L2 is in contact with the rear end surface 2b.

In the known lens holder having the above-mentioned structure, since the annular projection 2 is provided on the inner peripheral surface, when the lens holder 1 is manufactured by injection molding of the constituent resin, for example, a molding core ( If the (piece) is designed as an integral type, the annular projection 2 becomes an obstacle during the die cutting, and the piece cannot be pulled to the left side in FIG. Therefore, conventionally, when the lens holder 1 is manufactured by injection molding,
As shown in FIG. 9, the annular protrusion 2 and the piece 3 for forming a portion in front of the protrusion 2 and the piece 4 for forming a portion in the rear of the protrusion 2 are being formed. The child was split.

[0005]

When the lens holder having the above-mentioned conventional structure is manufactured by injection molding, it is necessary to divide the piece into two pieces as described above. Therefore, the shaft of the portion formed by the piece 3 is required. There was a risk that the core and the shaft center of the portion formed by the piece 4 would be misaligned. Therefore, in an optical system designed to have a high sensitivity to decentering, if the lens holder has the above-mentioned misalignment (decentering) of the axial center, it causes an optical defect that one-sided blur occurs on the image forming surface. Become.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved lens holder which can be manufactured by a processing method such as injection molding without causing the above-mentioned axial deviation. The object of the present invention will be described below for each claim.

According to a first aspect of the present invention, there is provided a lens holder containing at least one set of a first lens and a second lens which are arranged at a predetermined distance from each other in the optical axis direction. The second lens disposed rearward in the optical axis direction with respect to the first lens has the same diameter as the first lens or has a smaller diameter than the first lens, and the outer peripheral portion of the rear end surface of the first lens is A plurality of protrusions that engage with the outer peripheral edge of the front end surface of the second lens are formed at predetermined intervals along the circumferential direction of the inner peripheral surface of the lens holder, and the outer periphery of the first lens A first lens fitting portion that fits on the surface is formed at substantially the same central angle position as the projection, and a second lens fitting portion that fits on the outer peripheral surface of the second lens is located between the projections. It aims at providing the lens holder characterized by being formed in

According to a second aspect of the present invention, in a lens holder containing at least one pair of first lens and second lens which are arranged at a predetermined interval from each other in the optical axis direction, the lens holder is arranged in front of the optical axis. The second lens disposed rearward in the optical axis direction with respect to the first lens has the same diameter as the first lens or has a smaller diameter than the first lens, and the outer peripheral portion of the rear end surface of the first lens is A plurality of protrusions that engage with the outer peripheral edge of the front end surface of the second lens are formed on the inner peripheral surface of the lens holder at predetermined intervals along the circumferential direction, and the outer periphery of the first lens It is an object of the present invention to provide a lens holder characterized in that a lens fitting portion that fits on a surface and an outer peripheral surface of the second lens is formed at a position between the protrusions.

According to a third aspect of the present invention, in the lens holder having the structure of the first or second aspect, the lens is provided in the radial direction on at least one of the first lens fitting portion and the second lens fitting portion. It is an object of the present invention to provide a lens holder characterized by being provided with a radial fine adjustment means having a function of slightly moving the lens and fixing the lens so that the lens cannot be radially moved.

According to a fourth aspect of the present invention, in the lens holder having the structure of the third aspect, the radial direction fine adjustment means is provided in the first lens fitting part and the second lens fitting part in a radial direction. It is an object of the present invention to provide a lens holder characterized by comprising a screw hole and a screw screwed into the screw hole to move the lens in the radial direction.

According to a fifth aspect of the present invention, in the lens holder having the structure of the first or second aspect, the first lens and the second lens are provided in the first lens fitting portion and the second lens fitting portion. An object of the present invention is to provide a lens holder characterized in that caulking pieces for crimping are attached in series.

According to a sixth aspect of the invention, in the lens holder having the structure of the fifth aspect, the crimping piece is cut out at several places, and the second lens is slightly moved in the radial direction by a tool through the cutout portion. It aims at providing the lens holder characterized by the above.

[0013]

In order to solve the above problems, the invention of claim 1 provides at least one set of a first lens and a second lens which are arranged at a predetermined interval in the optical axis direction. In the built-in lens holder, the second lens disposed rearward in the optical axis direction with respect to the first lens disposed frontward in the optical axis has the same diameter as the first lens or a diameter smaller than the first lens. The plurality of protrusions engaging the outer peripheral edge portion of the rear end surface of the first lens and the outer peripheral edge portion of the front end surface of the second lens have predetermined intervals along the circumferential direction of the inner peripheral surface of the lens holder. A first lens fitting portion that is formed to be placed on the outer peripheral surface of the first lens, is formed at substantially the same central angle position as the protruding portion, and is fitted to the outer peripheral surface of the second lens. Two lens fitting portions are formed at a position between the protrusions, To provide a lens holder that.

According to a second aspect of the present invention, there is provided a lens holder containing at least one set of a first lens and a second lens arranged at a predetermined distance from each other in the optical axis direction. The second lens disposed rearward in the optical axis direction with respect to the first lens disposed frontward in the direction is the same diameter as the first lens or smaller than the first lens. A plurality of protrusions that engage with the outer peripheral edge of the rear end surface and the outer peripheral edge of the front end surface of the second lens are formed on the inner peripheral surface of the lens holder at predetermined intervals along the circumferential direction. Provided is a lens holder, wherein a lens fitting portion that fits on the outer peripheral surface of the first lens and the outer peripheral surface of the second lens is formed at a position between the protrusions.

In order to solve the above-mentioned problems, the invention of claim 3 provides a lens holder having the structure of claim 1 or 2 in at least one of the first lens fitting part and the second lens fitting part. Provides a lens holder characterized by being provided with radial fine adjustment means having a function of moving the lens slightly in the radial direction and fixing the lens so that it cannot be moved in the radial direction.

According to a fourth aspect of the present invention, there is provided a lens holder having the structure according to the third aspect, wherein the fine adjustment means in the radial direction has the first lens fitting portion and the second lens fitting portion. There is provided a lens holder comprising: a radial screw hole penetrating the screw hole; and a screw screwed into the screw hole to move the lens in the radial direction.

According to a fifth aspect of the present invention, there is provided a lens holder having the structure according to the first or second aspect, wherein the first lens fitting portion and the second lens fitting portion are the first lens fitting portion. Provided is a lens holder, wherein a crimping piece for crimping a lens and a second lens is formed.

According to a sixth aspect of the present invention, there is provided a lens holder having the structure according to the fifth aspect.
Provided is a lens holder characterized in that the crimping piece is cut out at several places, and the second lens is finely moved in the radial direction by a tool through the cutout portion.

[0019]

【Example】

<First Embodiment> A first embodiment of the present invention will be described below with reference to FIGS.

In FIG. 2, L1 to L5 are lenses, and 11
Is the lens holder of this embodiment. Lens L1 and lens L2 (lens L5
And 3) are fixedly arranged at a predetermined interval in the optical axis direction, and three projecting portions 12 are provided at predetermined intervals along the circumferential direction (in the present embodiment, at the center). Corner 120
The projections 2 are formed at intervals of 60 degrees), and the front end face 12a of the projection 12 engages with the outer periphery of the rear end face of the front lens L1 so that the lens L1 is fixed. Positioning and fixing in the optical axis direction, the rear end face 12 of the protrusion 12
The lens b is positioned and fixed in the optical axis direction by engaging with the outer peripheral edge of the front end surface of the rear lens L2.

Further, at the front position adjacent to the protrusion 12, as shown in FIG. 1, at the same central angle position as the protrusion 12, along the inner circumference of the holder, three central angles are provided at every 120 degrees. The lens L1 fitting portion 13 is formed, and a crimping piece 14 is provided at a position where the central angle position is slightly deviated from the protruding portion 12 so as to project forward from the fitting portion 13. After the lens L1 is brought into contact with the front end surface 12a of the projection 12 and fitted into the fitting portion 13, the crimping piece 14 is bent to fix the outer peripheral edge portion of the lens L1 with the crimping piece 14. As a result, the lens L1 is fixed.

On the other hand, at the position where the lens L2 is disposed behind the protrusion 12, three lens L2 fitting portions 15 fitted to the outer peripheral surface of the lens L2 are provided at a central angle of 120 degrees as shown in FIG. The lens L2 fitting portion 15 is provided at the position where the central angle position is deviated from the protrusion 12 as shown in FIG. Position). In addition, the lens L2 fitting portion 15
A caulking piece 16 is provided so as to project rearward from. The lens L2 is brought into contact with the rear end surface 12b of the projection 12 to perform positioning in the optical axis direction, and the outer peripheral surface of the lens is attached to the fitting portion 1
5, the crimping piece 16 is bent and crimped to the outer peripheral edge of the rear end surface of the lens L5 to fix the lenses L2 and L5.

As described above, in the lens holder according to the present embodiment, the projection 12 serving as the axial receiving portion of the front lens and the axial receiving portion of the rear lens is the entire circumference like the conventional lens holder. When the lens holder is manufactured by injection molding, a molding core (piece) is used because the projections 12 are separated from each other and are not continuous annular shapes.
2 can be pulled out to the left side in FIG. 2 even if it is designed as an integrated type, the axis of the front part of the lens holder and the axis of the rear part of the lens holder are different from each other as in the conventional lens holder. As a result, there is no danger, and as a result, according to the present embodiment, it is possible to provide a lens holder suitable for the configuration of an optical system including lenses having high decentering sensitivity.

<Second Embodiment> A second embodiment of the present invention will be described with reference to FIGS. 3 and 4. Since the lens holder of this embodiment is a modification of the lens holder of the first embodiment, the same components as those of the lens holder of the first embodiment in FIGS. 3 and 4 are the same as those in FIGS. 1 and 2. They are indicated by reference numerals, and description of these same components will be omitted.

The lens holder 11 of this embodiment is different from the lens holder 11 of the first embodiment in that the lens L1 fitting portion 13 and the lens L2 fitting portion 15 are integrally molded to form a lens fitting portion. That is 23. Therefore, similar to the lens holder described in the first embodiment, even if the molding core (piece) is designed as an integral type when the lens holder is manufactured by injection molding, it is pulled out to the left side in FIG. Therefore, unlike the conventional lens holder, there is no risk that the axial center of the front part of the lens holder and the axial center of the rear part of the lens holder may be different from each other. It is possible to provide a lens holder suitable for the configuration of an optical system including a high-performance lens.

<Third Embodiment> A second embodiment of the present invention will be described with reference to FIGS. Since the lens holder of this embodiment is obtained by further adding the following structural parts to the lens holder of the first embodiment or the second embodiment, in FIGS. 1 and 2 for the same components as the lens holder.
Are denoted by the same reference numerals, and description of these same components will be omitted.

The lens holder 11 of this embodiment is different from the lens holder 11 of the first embodiment in that the lens L2 fitting portion 15 is provided with three radial screw holes 18 as fine radial adjustment means. The lens L2 (and L5) can be finely adjusted in the radial direction by screwing a screw 17 into the screw hole 18 from the outside of the lens holder 11. Therefore, when the axes of the lenses L2 and L5 are slightly decentered with respect to the axis of the lens L1, the screw centers of the three screws 17 are adjusted to adjust the axes of the lenses L2 and L5 to that of the lens L1. It can be exactly aligned with the axis. In addition,
When the lens holder 11 is made of a synthetic resin material,
As a material, for example, F mixed with polyester and carbon fiber
Assuming that the RP is used, the lens holder is very strong but can be slightly elastically deformed, so that the screwing amount of the screw 17 causes the lens L2 fitting portion 15 to be slightly elastic in the radial direction. By deforming, the lenses L2 and L5 can be moved in the radial direction.

As described above, the lens holder of this embodiment has a higher function of aligning the optical axes of the front and rear lenses than the lens holder of the first embodiment, and therefore includes a plurality of lenses having high eccentricity sensitivity. It is suitable as a lens holder for an optical system, and can be manufactured by injection molding using an integral molding piece like the lens holder of the first embodiment.

<Fourth Embodiment> A fourth embodiment of the present invention will be described with reference to FIG. Since the lens holder of the present embodiment is a modification of the lens holder of the first embodiment, in FIG. 7, the same components as those of the lens holder of the first embodiment are indicated by the same reference numerals as those in FIGS. 1 and 2. The description of the same components will be omitted.

The lens holder 11 of this embodiment is different from the lens holder 11 of the first embodiment in that the caulking piece 16 is cut out at several places on the circumference, and as a result, it has a plurality of notches 19. That is. Therefore, the fitting portion of the lenses L2 and L5 can be slightly moved in the radial direction by a well-known tool 20, such as a micrometer, through any one of the plurality of cutouts 19. That is, the lens L1 and the lenses L2 and L5
It is possible to adjust the eccentricity. Then, after the adjustment, the lens 20 is fixed to the lens holder 11 by crimping the crimping piece 16 while holding the lenses L2 and L5 with the tool 20, or applying an adhesive through the remaining notch portion 19.

As described above, the lens holder of this embodiment has a higher function of aligning the optical axes of the front and rear lenses than the lens holder of the first embodiment, and thus includes a plurality of lenses having high eccentricity sensitivity. It is suitable as a lens holder for an optical system, and can be manufactured by injection molding using an integral molding piece like the lens holder of the first embodiment.

<Correspondence between the invention and the embodiment> The "projection" described in claim 1 or 2 is the projection 1 in the embodiment.
2, the "first lens fitting portion" described in claims 1 to 5 corresponds to the "lens L1 fitting portion 13" in the embodiment, and the "second lens fitting portion" in the embodiment. Lens L
2 Fitting part ". The "fine adjustment means in the radial direction" according to claims 3 to 5 is a "screw hole" and a "screw" in the embodiment.
Corresponds to the concept represented by and.

[0033]

According to the inventions of claims 1 to 6, molding can be performed using a non-dividable molding die (piece), and the axis of the front lens and the axis of the rear lens can be formed. It is possible to provide a lens holder that does not cause a discrepancy with the mind.

Further, according to the inventions of claims 3 to 6, since the axial center of the lens on the rear side can be finely adjusted, it is suitable for a high precision optical system including a lens pair having a high decentration sensitivity to each other. A lens holder can be provided.

According to the fifth aspect of the present invention, since the crimping pieces for crimping the lens are formed at the fitting portion for fitting the front lens and the fitting portion for fitting the rear lens, the lens is firmly fixed. Can be fixed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a lens holder according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the lens holder shown in FIG.

FIG. 3 is a vertical sectional view of a lens holder according to a second embodiment of the present invention.

FIG. 4 is a transverse sectional view of a lens holder according to a second embodiment.

FIG. 5 is a vertical sectional view of a lens holder according to a third embodiment of the present invention.

FIG. 6 is a transverse sectional view of a lens holder according to a third embodiment.

FIG. 7 is a transverse sectional view of a lens holder according to a fourth embodiment of the present invention.

FIG. 8 is a vertical sectional view of a conventional lens holder.

9A and 9B are views for explaining a method of dividing a molding die (piece) and a die cutting direction when the lens holder of FIG. 8 is manufactured by an injection molding method.

[Explanation of symbols]

1, 11 ... Lens holder 2 ... Annular projection 3, 4 ... Piece (molding core) 12 ... Projection 13 ... Lens L1 fitting portion 14, 16 ... Caulking piece 15 ... Lens L2 fitting portion 17 ... Screw 18 … Screw hole 19… Notch 20… Adjustment tool

Claims (6)

[Claims] 1. A lens holder containing at least one set of a first lens and a second lens arranged at a predetermined interval from each other in the optical axis direction, wherein the first lens arranged in front of the optical axis is And the second lens disposed rearward in the optical axis direction has the same diameter as the first lens or has a smaller diameter than the first lens, and the outer peripheral edge portion of the rear end surface of the first lens and the second lens A plurality of protrusions that engage with the outer peripheral edge of the front end face are formed on the inner peripheral surface of the lens holder at predetermined intervals along the circumferential direction, and are fitted to the outer peripheral surface of the first lens. The first lens fitting portion is formed at substantially the same central angle position as the projection, and the second lens fitting portion fitted to the outer peripheral surface of the second lens is formed at a position between the projections. A lens holder that is characterized. 2. A lens holder containing at least one set of a first lens and a second lens which are arranged at a predetermined distance from each other in the optical axis direction, wherein the first lens arranged in front of the optical axis is And the second lens disposed rearward in the optical axis direction has the same diameter as the first lens or has a smaller diameter than the first lens, and the outer peripheral edge portion of the rear end surface of the first lens and the second lens A plurality of protrusions that engage with the outer peripheral edge of the front end face are formed on the inner peripheral surface of the lens holder at predetermined intervals along the circumferential direction, and the outer peripheral surface of the first lens and the second lens A lens holder, wherein a lens fitting portion that fits on the outer peripheral surface of the lens is formed at a position between the protrusions. 3. At least one of the first lens fitting portion and the second lens fitting portion has a function of slightly moving the lens in the radial direction and fixing the lens so as not to move in the radial direction. The lens holder according to claim 1 or 2, further comprising a fine adjustment unit in the radial direction. 4. The radial direction fine adjustment means includes radial screw holes penetrating the first lens fitting portion and the second lens fitting portion, and the lens screwed into the screw holes. The lens holder according to claim 3, wherein the lens holder comprises a screw for moving the lens holder in a radial direction. 5. A crimping piece for crimping the first lens and the second lens is continuously provided to the first lens fitting portion and the second lens fitting portion. The lens holder according to claim 1 or claim 2. 6. The lens holder according to claim 5, wherein the crimping piece is notched at several places, and the second lens is finely moved in the radial direction by a tool through the notches.