JP2005091728A - Lens eccentricity adjustment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an eccentricity adjustment device which allows eccentricity adjustment to be performed in the same condition even in a unit level of a lens group as in a complete article. <P>SOLUTION: An adjustment device 1 has: an optical system part 2 provided in one side of a substrate 20; and an eccentricity adjustment part 15 provided in the other side. The optical system part 2 has: a barrel 13 for adjustment including a third lens group 5 being a reference; and a chart projecting optical system, and a second lens group 4 including an adjustment object lens 4a is attached to the barrel 13 for adjustment, and a chucking member 10 overlapping a diaphragm plate 9 having an opening part 9a is inserted to the optical system part 2 from the side of the eccentricity adjustment part 15 and is made to catch the adjustment object lens 4a and moves in a horizontal surface to perform eccentricity adjustment. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an eccentricity adjusting device for an optical system used for all photographing lenses such as a digital camera, a silver halide camera, a mobile photographing lens, and a video camera.

In recent years, with the downsizing of the lens system, the decentration sensitivity of each lens group has increased, and the amount of decentration allowed for the lens group is required to be suppressed to a level of several μmm. Therefore, the optical performance required by conventional mechanical accuracy alone cannot be satisfied.
For this reason, in an imaging optical system or the like, it is generally performed to adjust the eccentricity of the optical system that constitutes it.
By the way, with regard to this eccentricity adjustment, conventionally, when an eccentricity adjustment is required for an optical unit located in the middle of a predetermined optical system, the optical unit that needs to be adjusted is adjusted by the optical unit unit to obtain a predetermined optical system. There are known methods such as attaching, or using a different optical system as a dummy, temporarily placing the lens group to be adjusted at the position of the front group and adjusting the eccentricity, and then attaching the optical unit to be adjusted to a predetermined optical system. Yes.
However, with this method, the optical performance of the optical unit to be adjusted after the eccentricity adjustment cannot be adjusted while evaluating the final performance of the predetermined optical system.

Means for solving this problem have been proposed (see, for example, Patent Document 1 and Patent Document 2). According to this proposal, in the lens device having the lens holding means for holding the lens inside the lens barrel, the lens holding means has an exposed portion exposed to the outside of the lens barrel, and the exposed portion includes the mirror. Position adjustment in the direction orthogonal to the optical axis is performed by receiving adjustment force from the outside of the tube.
Further, Patent Document 2 further includes a first adjusting unit that moves and adjusts the optical system to be adjusted only in a predetermined direction having a plane perpendicular to the optical axis, and a second adjusting unit that moves only in a direction substantially orthogonal to the predetermined direction. And have.
In this method, the holding means for holding the lens in the lens barrel is provided with an exposed portion exposed at the outer peripheral portion of the lens barrel, so that a large space can be taken in the configuration of the “exposed portion”. Further, when the optical unit to be adjusted needs to move in the optical axis direction, the moving structure using the cam ring and the straight moving frame cannot be obtained, so that the moving structure is limited and design freedom is lost. In addition, when the optical unit to be adjusted cannot be adjusted in the adjustment process, it is necessary to disassemble the entire optical system again and perform repairs or the like, so that the assembly adjustment process is expected to be complicated.

Japanese Patent Laid-Open No. 11-174301 (page 3, FIG. 1) Japanese Patent Laid-Open No. 11-271587 (page 3, FIG. 1)

When performing decentration adjustment in the middle group of the entire optical system, and confirming the performance of the entire optical system, the outer periphery of the lens barrel called an “exposed portion” as in the conventional example If a member for adjusting the eccentricity extending to the lens is provided, the space in the lens barrel may be taken up due to the configuration of the “exposed part”, and the magnification change mechanism (zoom mechanism) of the lens barrel. The system will be limited.
In order to secure the space efficiency of the lens barrel layout and the degree of freedom in selecting the design of the lens barrel zoom mechanism, etc., the final optical performance is confirmed in the entire optical system with the adjustment tool held in the adjustment jig. It can be so.
In addition, if the system is designed to check the performance of the entire optical system after decentration adjustment just before the lens barrel is completed, if the desired performance is not achieved, the lens barrel must be disassembled and repaired, and the process is complicated. End up.
Therefore, it is desirable to have a configuration in which the performance of the entire optical system can be confirmed in a process that is not immediately before completion.

When checking the performance through the entire optical system, if there is no “aperture”, aberrations that are not taken into consideration in the optical design are generated, so that correct performance check is impossible. Therefore, it is indispensable to arrange the “aperture” at a predetermined position of the optical system. However, when the positions of the “aperture” and the “adjusted lens” are close, the layout space of the “aperture” as a dummy cannot be taken.
Therefore, when adjusting the decentration within the group of groups located in the middle while checking the final performance through the entire optical system, the positions of the `` adjusted lens '' and `` diaphragm '' are If it is close (specifically, a distance of about 1 mm), the problem is where to place the “aperture”.
Further, when an ultraviolet (UV) curable adhesive is used to fix the “adjusted lens” after adjustment, the “aperture” becomes an obstacle and the efficiency of UV irradiation is significantly reduced.

  According to the first aspect of the present invention, there is provided an optical system decentration adjusting device comprising two or more lens groups, a substrate, an adjustment lens barrel having an optical axis in the vertical direction, and a chart projection. An optical system unit including an optical system, and an eccentricity adjustment unit provided on the substrate, and the adjustment lens barrel includes a lens group other than the lens group whose eccentricity is to be adjusted as a reference lens group, The eccentricity adjustment unit includes a chucking member having a claw portion for chucking the lens to be adjusted to be decentered in the lens group to be adjusted for decentration, and the chucking member is separated from the eccentricity adjustment unit. After the chucking of the lens to be adjusted by the above operation, it is possible to move two-dimensionally in a horizontal plane, and photocuring for fixing the lens to be adjusted near the claw portion of the chucking member Injection mold adhesive It has a light transmission portion for emitting light Te, and having an aperture portion corresponding to the aperture to be provided in the optical system.

According to a second aspect of the present invention, in the lens decentering adjustment device according to the first aspect, the decentering adjusting portion is configured to be able to move the chucking member three-dimensionally.
According to a third aspect of the present invention, in the lens decentering adjustment device according to the first or second aspect, the adjustment lens barrel has a side opening, and the chucking member passes through the side opening and the optical system. It is characterized in that it can be inserted into and retracted from the unit.
According to a fourth aspect of the present invention, in the lens eccentricity adjusting device according to the third aspect, the insertion and withdrawal of the chucking member is based on a rotation about a support shaft of the eccentricity adjusting portion.

According to a fifth aspect of the present invention, in the lens eccentricity adjusting device according to the third aspect, the insertion / retraction of the chucking member is caused by a horizontal movement of the eccentricity adjusting portion.
According to a sixth aspect of the present invention, in the lens eccentricity adjusting device according to any one of the first to fifth aspects, the aperture opening is formed in a chucking member.
According to a seventh aspect of the present invention, in the lens decentering adjustment device according to any one of the first to fifth aspects, the diaphragm opening is formed on a diaphragm plate separate from the chucking member. And

According to an eighth aspect of the present invention, in the lens eccentricity adjusting device according to the seventh aspect, the diaphragm plate is configured such that one end of the diaphragm plate is pivotally attached to the chucking member and can be retracted from the optical system unit. It is characterized by.
According to a ninth aspect of the present invention, in the lens eccentricity adjusting device according to any one of the first to eighth aspects, the claw portion is in contact with an outer peripheral portion of the lens to be adjusted at at least two locations. To do.
According to a tenth aspect of the present invention, in the lens decentering adjusting device according to any one of the first to ninth aspects, the chucking member is formed of an elastic member.

According to an eleventh aspect of the present invention, in the lens eccentricity adjusting device according to any one of the first to tenth aspects, an elastic member is attached to a surface of the claw portion that contacts the lens to be adjusted. It is characterized by.
According to a twelfth aspect of the present invention, in the lens eccentricity adjusting device according to any one of the first to eleventh aspects, the periphery of the claw portion of the chucking member corresponds to an outer peripheral portion of the lens to be adjusted. It is characterized in that two or more light transmitting portions serving as an adhesive injection hole and a light irradiation hole are provided at a position.
According to a thirteenth aspect of the present invention, there is provided a lens barrel adjusted by the lens eccentricity adjusting device according to any one of the first to twelfth aspects.
According to a fourteenth aspect of the present invention, there is provided a camera using the lens barrel according to the thirteenth aspect.

  According to a fifteenth aspect of the present invention, the lens eccentricity adjusting device according to any one of the first to twelfth aspects is used, the chucking member is retracted from the optical system unit, and a desired optical system is mounted on the substrate. The corresponding adjustment lens barrel is fastened, the lens group whose eccentricity is to be adjusted is fastened in a predetermined position, the reference lens group as the front group is fastened, the chucking member is inserted into the optical system unit, The adjustment lens is chucked, the light source is turned on to illuminate the chart, and the chucking member is operated in the horizontal plane by the eccentricity adjustment unit while viewing the image projected on a predetermined screen, and the image is best. Remove the lens group as the front group at the position where it is in the state, and if necessary, retract the aperture opening from the optical system unit, inject a photo-curing adhesive from the light transmission unit, from the same direction The light required for curing the photo-curing adhesive is irradiated to fix the lens to be adjusted to the lens frame of the second lens group, the chucking member is released from the lens to be adjusted, and the optical system unit A decentration adjusting method for retracting and taking out the second lens group is characterized.

Although the present invention is capable of adjusting the eccentricity at the unit level of the lens group, it can adjust the eccentricity under the same conditions as the finished product. Disappear. Therefore, the size and cost can be reduced.
The mechanism for inserting and retracting the chucking member into the optical system unit enables smooth adjustment of the lens group to be adjusted.
Since contact with the lens to be adjusted is performed at least at two places, stable movement adjustment of the lens to be adjusted can be performed, and the working time can be shortened.
Light irradiation to the photo-curing adhesive can be efficiently performed while the lens to be adjusted is chucked.

  An optical system unit composed of an adjustment lens barrel and a chart projection optical system, and an eccentricity adjustment unit are provided adjacent to the same substrate, and a reference lens group and an adjusted lens group are attached to the adjustment lens barrel, A chucking member extending from the eccentricity adjustment unit chucks the lens to be adjusted through the side opening of the adjustment barrel, and moves the lens to be adjusted in the horizontal plane by operating the eccentricity adjustment unit while viewing the projected image of the chart. To adjust the eccentricity. The chucking member chucks the outer periphery of the lens to be adjusted using a claw, and has an opening corresponding to a diaphragm near the center of the lens to be adjusted. A plurality of light transmission portions are provided in order to secure an adhesive inlet and not to block light irradiation for curing.

Hereinafter, the present invention will be described according to embodiments.
FIG. 1 is a partial cross-sectional view for explaining an embodiment of the present invention.
In the figure, reference numeral 1 denotes an adjustment device, 2 denotes an optical system unit, 3 denotes a first lens group, 4 denotes a second lens group, 5 denotes a third lens group, 6 denotes a light source, 7 denotes a chart, 8 denotes a screen, and 9 denotes Aperture plate, 10 is a chucking member, 11 is an aperture support shaft, 12 is an aperture rotation knob, 13 is an adjustment barrel, 14 is a chart adjustment stage, 15 is an eccentricity adjustment unit, 16 is a z1 stage, and 17 is a z2 stage. , 18 is an xy stage, 19 is a stage support shaft, and 20 is a substrate.
This adjustment device is configured as a device suitable for a lens system having a configuration in which the lens group in which the influence of decentering is most significant is the second lens group, and in particular, the decentering of the first lens is most involved in lens performance deterioration. doing. Although the configuration of the adjusting device differs depending on where the lens to be adjusted is, the gist of the present invention can be applied in any case. For example, when the second lens group and the third lens group can be substantially integrated, the adjustment is performed by attaching the second lens group as the lens group to be adjusted to an adjustment lens barrel having no lens system. .

The adjusting device 1 is roughly divided into an optical system unit 2 and an eccentricity adjusting unit 15, both of which are mounted on a common substrate 20 provided on a horizontal plane. The optical system unit 2 assumes that the first lens group 3, the second lens group 4, and the third lens group 5 are arranged in this order from above with the optical axis oriented in the vertical direction, and is adjusted on the substrate 20. The lens barrel 13 is attached. The first lens group 3 and the third lens group 5 are reference lens groups, and are specially adjusted so as to match the design values and the performance is guaranteed. The second lens group 4 is a lens group to be adjusted, and the first lens group 3 can be attached and detached as necessary for the attachment and detachment.
Arbitrary lens barrels 13 and lens groups can be fastened using any practical technique. For example, a screw-in type or a drop-in type by fitting with high accuracy may be used. For the first lens group, a screw-in type is suitable for adjusting the focus.

At the top of the second lens group is a first lens 4a for which the optical axis decentration is to be adjusted, and a diaphragm plate 9 having a predetermined diaphragm aperture 9a is placed immediately above the first lens 4a, under the same conditions as in actual use. So that the eccentricity can be adjusted. Hereinafter, the first lens 4a whose decentration is to be adjusted is referred to as an adjusted lens 4a. The diaphragm plate 9 is placed on a chucking member 10 extending from the adjacent eccentricity adjustment section 15, and is rotated from the optical system section by rotating the diaphragm rotation knob 12 around the diaphragm support shaft 11. It can be evacuated.
The chucking member 10 has a slightly large opening 10b that does not block the light beam passing through the diaphragm opening 9a at substantially the same position as the diaphragm opening 9a, and grasps the periphery of the lens 4a to be adjusted from above. It is held in the horizontal plane and moved two-dimensionally in a horizontal plane, details will be described later.
A projection chart plate 6 is placed under the adjusting lens barrel 13 and illuminated by a light source 7 provided therebelow. The chart plate 6 has a projection chart 6a substantially at the center, and the peripheral part is a light shielding part 6b. The image of the chart 6 a that has passed through the lens system is projected onto the screen 8 that is located at a predetermined distance from the first lens group 3. The chart adjustment stage 14 can move in the vertical direction as indicated by the arrow A so that the distance of the chart plate 6 from the adjustment barrel 13 can be changed as necessary.

The eccentricity adjusting device 15 includes a z1 stage 16, a z2 stage 17 on which the z1 stage 16 is mounted, and an xy stage 18 on which they are mounted. The xy stage 18 is rotatably supported in a horizontal plane by a stage support shaft 19 held on the substrate 20.
Both the z1 stage 16 and the z2 stage 17 can move only in the vertical direction as indicated by arrows B and C, respectively. The z2 stage 17 is for so-called coarse movement that adjusts the position mainly in accordance with the size of the lens barrel to be adjusted, and the z1 stage 16 is for moving a small amount for chucking the lens 4a to be adjusted. belongs to. For this reason, the chucking member 10 extending in the direction of the optical system unit is integrally fixed to the z1 stage 16 and moved downward to lightly press the periphery of the lens 4a to be adjusted from above. By moving the z1 stage upward, the chucking member 10 moves away from the first lens 4a. A combination of the z1 stage and the z2 stage as a stage with a fine movement mechanism has been put into practical use, and it is preferable to use them.
The xy stage 18 is used for actual eccentricity adjustment, and a small amount of movement in two dimensions is possible in the horizontal direction by the x stage and the y stage.
The stage support shaft 19 rotates the xy stage on which both the z1 and z2 stages are mounted in the horizontal plane, so that the chucking member 10 is retracted from the optical system unit 2 together with the diaphragm plate 9, and the second lens group 4 is moved. It can be removed from the adjusting lens barrel 13.

Hereinafter, the usage method of this adjustment apparatus is demonstrated.
The adjusting lens barrel is prepared in accordance with various lens systems, and has an outer diameter or the like that can be incorporated in the adjusting device in advance. The prepared adjustment barrel has only the first lens group and the third lens group. However, there may be a case where there is no third lens depending on the lens system.
The lens barrel for adjustment 13 corresponding to the lens system to be decentered is selected and held at a predetermined position of the adjusting device 1. At this time, the xy stage 18 is rotated around the stage support shaft 19 so that the chucking member 10 is out of the optical system unit so that the chucking member 10 does not interfere with the attachment.
The first lens group is removed, and the second lens group as the lens group to be adjusted is fitted into a predetermined position. The first lens group is returned to its original position, the xy stage is further rotated, and the chucking member 10 on which the diaphragm plate 9 is placed is inserted from the side opening 13 a of the adjustment barrel 13.

FIG. 2 is a partially omitted cross-sectional view illustrating a state in which the chucking member is inserted into the optical system unit.
The z2 stage 17 is positioned by moving in the direction of the arrow C according to the height of the side opening 13a of the target adjustment barrel 13, and the z1 stage 16 is an arrow B necessary for chucking the lens to be adjusted and opening it. It is set to the highest position among the movement amounts in the direction. When the stage support shaft 19 is rotated in this state and the chucking member 10 is inserted into the optical system unit 2, the plurality of claw portions 10 a of the chucking member 10 are positioned directly above the lens to be adjusted 4 a and in a non-contact state. To do. The xy stage is initially set so that the rotation stop position around the stage support shaft of the xy stage is a predetermined position on the design of the diaphragm plate 9.
When the z1 stage 16 is lowered by a predetermined amount, the chucking member 10 is lowered in the direction of the lens 4a to be adjusted, the plurality of claw portions 10a are in contact with the outer shape of the lens 4a to be adjusted, and the chucking member 10 and the like are slightly affected by the elastic force. The lens to be adjusted 4a is pressed downward by force, and the state shown in FIG. 1 is obtained. Since this pressing force can be separately measured and can be adjusted by the downward movement amount of the z1 stage 16, it can be set to always have a desired pressing force by specifying a specific movement amount.

The light source 7 is turned on and the image of the chart 6a is projected on the screen 8. Basic adjustments such as image size on the screen 8 and focusing before the eccentricity adjustment are performed by adjusting the chart adjustment stage 14 in the direction of arrow A and adjusting the position of the first lens group in the optical axis direction.
Observe the contrast, resolution, and other aberrations of the image on the screen. When it is determined from the state of the image that there is eccentricity, the best position is searched for while watching the change in the image by moving the xy stage in each direction. At this time, since the aperture opening 9a, which is substantially equivalent to the aperture of the final product, is incorporated in the optical system, it is almost the same as when the eccentricity is adjusted in the state of the final product, and a highly reliable performance can be guaranteed.
When the best position of the lens 4a to be adjusted is determined, the first lens group 3 is removed, and a photo-curing adhesive is placed between the periphery of the lens 4a to be adjusted and the inside of the lens barrel of the second lens group 4. Inject and light cure.
At this time, since the diaphragm plate 9 covers the periphery of the lens 4a to be adjusted, it is not possible to inject adhesive or irradiate light as it is. Therefore, as described above, the diaphragm plate 9 is retracted outside the optical system unit. If the first lens group 3 and the diaphragm plate 9 are not provided, sufficient photoirradiation can be applied to the photocurable adhesive, so that the bonding is completed in a short time. However, the chucking member 10 is provided with a light transmitting portion as described later for the injection and light irradiation of the photocurable adhesive.

FIG. 3 is a partial plan view showing a retracted state of the chucking member and the diaphragm plate from the optical system unit. A solid line indicates an inserted state, and a one-dot chain line indicates a retracted state.
The chucking member 10 is inserted and retracted as indicated by an arrow D with the stage support shaft 19 as the center. A single retraction of the diaphragm plate 9 is performed as indicated by an arrow E around the diaphragm support shaft 11 by turning the diaphragm rotation knob 12. The aperture support shaft 11 is integrated with the aperture plate 9 and is rotatably attached to the chucking member 10. Positioning of the diaphragm plate 9 with respect to the chucking member 10 is performed by bringing a notch 9c provided at a position corresponding to that of the diaphragm plate into contact with a pin 10c provided in a part of the chucking member. The amount of rotation indicated by the arrows D and E may be in a range that does not hinder the attachment / detachment of the adjustment barrel 13, the attachment / detachment of the first lens group 3, light irradiation, and the like. It is a guide.
The adjustment barrel 13 has a side opening 13a so as not to hinder the rotation of the chucking member 10. .

When the adhesion and curing are completed, the claw portion 10a of the chucking member 10 can open the adjusted lens 4a. That is, the chucking member is retracted from the optical system unit by moving the z1 stage 16 upward to move the claw portion 10a away from the lens 4a to be adjusted, and then rotating the xy stage in the direction opposite to that during insertion.
Since the second lens group 3 is obtained in a completed state without decentering, it is attached to a lens barrel having a third lens group as a product in a predetermined relationship, and further, the first lens group is further attached as a product. The lens barrel is completed.
FIG. 4 is a view showing a completed example of a lens barrel to which the present invention is applied.
In the figure, reference numeral 100 denotes a lens barrel as a product, and S denotes an adhesive.
FIG. 5 is a view showing a camera using a lens barrel to which the present invention is applied.
In the figure, reference numeral 200 denotes a still camera.

FIG. 6 is a perspective view for explaining an example of the claw portion of the chucking member. In the same figure, it has shown by the figure seen from the side with the nail | claw part 10a.
The nail | claw part 10a is formed so that the corner | angular part of the outer peripheral part of the to-be-adjusted lens 4a may be hold | suppressed.
Two or more claw portions 10a are preferably provided. In the figure, four examples are shown, but three claws are most suitable for holding the outer periphery of the circular lens.
In FIG. 5A, the claw portion 10a is shown as an example formed by a method of preparing claw parts and fixing them to the chucking member 10 by adhesion, welding, or the like. The protrusions may be left on a part of the inner periphery of the skirt and bent and formed into a nail shape, or a plurality of claw portions 10a may be formed by so-called cutting as shown in FIG. You may do it. In this case, the opening 10b is smaller than the outer shape of the lens to be adjusted, but larger than the opening 9a of the diaphragm plate 9.
Since the lens to be adjusted 4a is fixed with a photo-curing adhesive after the adjustment is completed, it is necessary to leave an injection portion of the adhesive and light must reach around the lens. Therefore, it is convenient if there is a hole on the outside of the claw portion 10a. However, since the adhesive and the light do not reach the whole by itself, it is preferable to cut out a portion corresponding to the outer periphery of the lens 4a to be adjusted of the chucking member 10 as a light transmitting portion 10d.

The material of the chucking member 10 may be metal or synthetic resin, but the claw portion 10a chucks a lens made of glass or transparent resin, so that the lens is not damaged and adjustment by two-dimensional movement in a horizontal plane is possible. In this case, it is necessary not to slip each other. Therefore, if the claw member 10a is made of a synthetic resin or is a metal claw, a member such as a rubber having a little flexibility may be attached to the contact surface with the lens.
First, it has been explained that the pressing force for pressing the lens to be adjusted downward is obtained by the elastic force of the chucking member, but if the chucking member 10 is made of synthetic resin, the elastic force can be easily obtained. In the case of being made of metal, the same role can be achieved by the elastic force of the member attached to the claw portion 10a.

FIG. 7 is a view showing another example of the chucking member. FIG. 4A is a plan view of the chucking member, and FIG. 4B is a cross-sectional view including the claw portion 10a showing the relationship with the second lens group.
It is assumed that the claw portion 10a is formed by a method of cutting and bending a metal plate, for example. The periphery 10d of the claw portion 10a is cut off. The opening 10b ′ can have the same size as the aperture opening 9a of the aperture plate 9, and the aperture plate 9 can be omitted. In that case, the chucking member 10 also serves as an aperture plate, and when the chucking member is inserted into the optical system unit 2 and chucks the lens to be adjusted, the aperture must be in a predetermined position in the optical axis direction. Therefore, it is necessary to make the claw member 10a longer than that shown in FIG. Therefore, the elastic member 10e is stuck on the claw part 10a. In this way, it is possible to apply a desired pressing force while the lens to be adjusted is chucked at a predetermined position while the aperture opening is positioned at a predetermined position in the design. And since the periphery 10d of the nail | claw part 10a is cut off, injection | pouring of a photocurable adhesive agent and light irradiation to an adhesive agent can fully be performed. In this configuration, it is not necessary to take the procedure of retracting the diaphragm plate when irradiating light, and the work becomes easier. However, if there is a possibility that the notch 10d transmits undesired light and adversely affects the projected image of the chart, the diaphragm plate 9 is not omitted and the outer periphery of the lens 4a to be adjusted is shielded. do it. In that case, the aperture opening may be provided in either the aperture plate 9 or the chucking member 10.
Note that the connecting portion 10f of the chucking member 10 and the z1 stage 16 is not necessarily wide if the rigidity permits, and is shown as narrow as an example.

FIG. 8 is a diagram showing a configuration in which the light irradiation amount is further increased.
In the figure, the entire periphery 10d ′ other than the claw portion 10a is cut off. The periphery 10d 'is basically formed in a circle that is substantially equal to the outer periphery of the lens 4a to be adjusted. Also in this example, the elastic member 10e is pasted on the claw portion 10a as in the case of FIG.
Also in this embodiment, the opening 10b ′ of the chucking member 10 can also serve as a diaphragm plate.
With this configuration, when the first lens group is removed for curing the adhesive and light irradiation is performed from above, the portion into which the adhesive is injected, that is, the outer peripheral portion of the lens to be adjusted has the claw portion 10a. Since all of the light is exposed except for the portion, the curing time of the adhesive is further shortened.

FIG. 9 is a partially omitted view for explaining another embodiment.
In the figure, reference numeral 21 denotes a slider, and 22 denotes a slide substrate.
The present embodiment is another configuration for retracting the chucking member 10 from the optical system unit 2. In FIG. 2, the xy stage 18 is rotated around the stage support shaft 19, but in the present embodiment, the xy stage 18 is linearly retracted.
The substrate portion of the xy stage 18 is a slider 21 and is configured to move in the direction of arrow F on the slide substrate 22.
When starting the adjustment with this adjusting device, first, the slider 21 is moved to the left in the drawing so that the chucking member 10 is retracted from the optical system unit 2 so that the adjustment barrel 13 is not hindered. Keep it. Thereafter, when the predetermined optical system has been attached, the claw portion 10a of the chucking member 10 and the opening 9a of the aperture plate 9 are set to the predetermined positions when the slider 21 is moved to the right stop position. It is.
With the configuration of the present embodiment, the size of the adjustment device 1 in the left-right direction is increased, but the depth direction can be reduced as much as it is not necessary to take a retreat space by the rotation of the chucking member 10. In addition, since the side opening 13a of the adjustment barrel 13 can be reduced, the strength of the adjustment barrel can be increased.

It is a partial sectional view for explaining an embodiment of the present invention. FIG. 6 is a partially omitted cross-sectional view illustrating a state where a chucking member is inserted into the optical system unit. It is a fragmentary top view which shows the retracted state from the optical system part of a chucking member and an aperture plate. It is a figure which shows the completion example of the lens barrel to which this invention is applied. It is a figure which shows the camera using the lens barrel to which this invention is applied. It is a perspective view for demonstrating an example of the nail | claw part of a chucking member. It is a figure which shows the other example of a chucking member. It is a figure which shows the structure which further enlarged the light irradiation amount. It is a partially abbreviated figure for demonstrating other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Adjustment apparatus 2 Optical system part 3 1st lens group 4 2nd lens group 5 3rd lens group 9 Diaphragm plate 10 Chucking member 13 Adjustment lens barrel 15 Eccentricity adjustment part

Claims (15)

  An optical system eccentricity adjustment device comprising two or more lens groups, an optical system unit including a substrate, an adjustment lens barrel having an optical axis in the vertical direction and fastened to the substrate, and a chart projection optical system; An eccentricity adjusting portion provided on the substrate, and the adjusting lens barrel includes a lens group other than the lens group whose eccentricity is to be adjusted as a reference lens group, and the eccentricity adjusting portion includes the eccentricity. Among the lens groups to be adjusted, a chucking member having a claw portion for chucking the lens to be adjusted to be decentered is provided. The chucking member chucks the lens to be adjusted by an operation from the eccentricity adjusting portion. After the king, it is possible to move two-dimensionally in a horizontal plane, and a light curable adhesive for fixing the lens to be adjusted is injected in the vicinity of the claw portion of the chucking member to emit light. The light transmission part to irradiate And, the lens eccentricity adjustment apparatus characterized by having an aperture portion corresponding to the aperture to be provided in the optical system.   The lens eccentricity adjustment apparatus according to claim 1, wherein the eccentricity adjustment unit is configured to be able to move the chucking member three-dimensionally.   3. The lens eccentricity adjusting device according to claim 1, wherein the adjustment barrel has a side opening, and the chucking member can be inserted into and retracted from the optical system through the side opening. A lens decentering adjustment device characterized by that.   4. The lens eccentricity adjustment device according to claim 3, wherein the insertion and retraction of the chucking member is based on rotation about a support shaft of the eccentricity adjustment unit.   4. The lens eccentricity adjusting device according to claim 3, wherein the insertion and retraction of the chucking member is caused by a straight movement in the horizontal direction of the eccentricity adjusting portion.   6. The lens eccentricity adjusting device according to claim 1, wherein the aperture opening is formed in a chucking member.   6. The lens eccentricity adjusting device according to claim 1, wherein the aperture opening is formed on a diaphragm plate different from the chucking member.   8. The lens eccentricity adjustment device according to claim 7, wherein one end of the diaphragm plate is rotatably attached to the chucking member, and the lens eccentricity is configured to be retractable from the optical system unit. Adjustment device.   9. The lens eccentricity adjusting device according to claim 1, wherein the claw portion is in contact with an outer peripheral portion of the lens to be adjusted at at least two points. 10.   The lens eccentricity adjusting device according to any one of claims 1 to 9, wherein the chucking member is formed of an elastic member.   11. The lens eccentricity adjusting device according to claim 1, wherein an elastic member is attached to a surface of the claw portion that is in contact with the lens to be adjusted.   The lens eccentricity adjusting device according to any one of claims 1 to 11, wherein an adhesive injection hole and light irradiation are provided at a position corresponding to the outer peripheral portion of the lens to be adjusted, around the claw portion of the chucking member. 2. A lens eccentricity adjusting device comprising two or more light transmitting portions that also serve as holes.   A lens barrel adjusted by the lens eccentricity adjusting device according to claim 1.   A camera using the lens barrel according to claim 13.   13. The lens decentering adjustment device according to claim 1, wherein the chucking member is retracted from the optical system unit, and a reference third lens group corresponding to a desired optical system is provided on the substrate. The adjustment lens barrel is fastened, the second lens group whose eccentricity is to be adjusted is fastened in a predetermined position, the reference first lens group is fastened in a predetermined position, and the chucking member is inserted into the optical system unit, Chucking the lens to be adjusted, illuminating the chart by turning on the light source, operating the chucking member in a horizontal plane by the eccentricity adjustment unit while viewing the image projected on a predetermined screen, the image is Remove the first lens group at the best position, and if necessary, retract the aperture opening from the optical system unit, inject a photo-curing adhesive from the light transmission unit, and from the same direction The light required for curing the photo-curing adhesive is irradiated to fix the lens to be adjusted to the lens frame of the second lens group, the chucking member is released from the lens to be adjusted, and the optical system unit A decentering adjustment method characterized by retracting and taking out the second lens group.

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