JP2006330210A - Method and device for collimating lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform eccentricity adjustment of a lens with high precision without increasing machining precision of a lens frame when collimation of the lens is performed. <P>SOLUTION: A device for collimating the lens includes an eccentricity measuring instrument 12 which measures the quantity of eccentricity of the optical axis 20 of the lens 1 to be adjusted, a lens holder 3 which vacuum-sucks and holds the lens 1 to be adjusted, a rotating mechanism 4 which rotates the lens holder 3, an XY stage 6 and a two-axial tilt stage 7 which adjust the eccentricity of the optical axis 20 of the lens 1 to be adjusted, an XY stage 11 which positions a center axis 16 of the lens frame 2 to be adjusted on an optical axis 12a of the eccentricity measuring instrument 12, and a UV light irradiation device 27 which cures an adhesive 26 for fixing the lens 1 to be adjusted and the lens frame 2 to be adjusted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lens centering method and apparatus for fixing a lens to a lens frame.

  As a method of centering the lens, for example, the following procedure is generally performed. That is, a lens frame having a holding part for mounting the outer peripheral part of the lens is used, and a UV adhesive (adhesive that is cured by ultraviolet rays) is applied to the outer peripheral part of the lens, and the lens is accommodated in the holding part of the lens frame. . Further, the lens is rotated around the central axis of the lens frame, and the optical surface (lens surface) of the lens is pushed by the centering member while checking the amount of eccentricity with an eccentricity measuring machine. Thus, centering is performed by correcting the tilt of the lens, and ultraviolet rays are irradiated to fix the lens to the lens frame.

  Conventionally, as a lens centering device using such means, for example, those shown in FIGS. 14 and 15 are known. According to this prior art, the lens frame 2 in which the lens 1 is accommodated in the lens holding portion 30 is abutted against the outer periphery of the lens frame 2 by contacting the lens frame 2 with the lens roller 2 abutting and positioned at two locations on the outer periphery. 2 has a lens frame rotation roller 23 that rotates the lens frame 2 around a central axis 16, and a centering member 15 that contacts the optical surface of the lens 1 and presses the optical surface. Then, the lens 1 is rotated around the central axis 16 of the lens frame 2 by the lens frame rotation roller 23, and the optical surface of the lens 1 is aligned with the centering member 15 while checking the amount of eccentricity with the eccentricity measuring device 12. Press to center.

As another prior art, for example, an automated lens centering device described above is known (see Patent Document 1). According to this prior art, as shown in FIG. 16, the lens frame 2 containing the lens 1 is centered and held by the taper roller 31, and the lens 1 and the lens frame 2 are rotated by the motor 33 around the optical axis. The centering member 15 is brought into contact with the optical surface of the lens 1 by operating the moving mechanism 22. Then, the position of the centering member 15 is controlled so that the amount of eccentricity of the lens 1 measured by the eccentricity measuring machine 12 is minimized.
JP-A-6-250062 (page 3, FIG. 5)

  However, in the prior art shown in FIGS. 14 and 15, as shown in FIG. 17A, the lens 1 is placed on the lens holding portion 30 of the lens frame 2, and the central axis 32 of the lens holding portion 30. Therefore, if the concentricity of the lens holding portion 30 with respect to the outer peripheral surface of the lens frame 2 is not processed with high accuracy, the center axis 16 of the lens frame 2 and the optical axis 20 of the lens coincide with each other. Will not. In addition, as shown in FIG. 17B, even if the centering member 15 is brought into contact with the optical surface of the lens 1 and the lens optical axis 20 is moved to the central axis 16 of the lens frame 2, the lens 1 is held by the lens. Since it tries to return to the central axis 32 of the part 30, highly accurate lens centering becomes difficult. In this case, if it is an experienced worker, the lens optical axis 20 and the lens frame central axis 16 are made to coincide with each other and fixed with an adhesive while the movement of the lens 1 to return to the central axis 32 of the lens holding unit 30 is suppressed. It is possible, but advanced skill acquisition is necessary.

  Further, when the centering operation is performed by an automated lens centering device as shown in FIG. 16, the centering member 15 is brought into contact with the lens 1 to correct the position. It was difficult to control appropriately. On the other hand, it is conceivable to add a mechanism for holding the lens 1 or the like, but this makes the device structure and the control means very complicated.

  The present invention has been made to solve such a problem, and the object of the present invention is to increase the processing accuracy of the lens frame and to require advanced technology when adjusting the centering of the lens. It is another object of the present invention to provide a lens centering method and apparatus capable of adjusting the eccentricity of the lens with high accuracy.

In order to achieve the object, the invention according to claim 1
Adjustment is made so that the optical axis of the lens to be adjusted and the center axis of the lens frame to which the lens to be adjusted is attached coincide with each other, and after the adjustment, the lens to be adjusted is fixed to the lens frame to be adjusted. In the lens centering and fixing method,
Setting a predetermined reference position by matching the optical axis of the eccentricity measuring device and the lens optical axis of the lens unit set as a reference;
Positioning the central axis of the lens frame to be adjusted at the reference position after removing the reference lens unit set; and
Placing the lens to be adjusted, which is coated with an adhesive on the outer periphery, on a lens holder, and adjusting the eccentricity by matching the optical axis of the lens to be adjusted with the optical axis of the eccentricity measuring device;
Fixing the lens to be adjusted and the lens frame to be adjusted with the adhesive after decentering adjustment,
It is characterized by that.

The invention according to claim 2 is the lens centering method according to claim 1,
The lens to be adjusted is held such that an optical surface thereof does not contact the lens frame to be adjusted.

The invention according to claim 3
Adjustment is made so that the optical axis of the lens to be adjusted and the center axis of the lens frame to which the lens to be adjusted is attached coincide with each other, and after the adjustment, the lens to be adjusted is fixed to the lens frame to be adjusted. In the lens centering device to obtain
An eccentricity measuring device for measuring the eccentricity of the optical axis of the lens to be adjusted;
A lens holder that holds the lens to be adjusted by vacuum suction;
A rotation mechanism for rotating the lens holder;
Optical axis adjusting means for adjusting the eccentricity of the optical axis of the lens to be adjusted;
Positioning means for positioning the central axis of the lens frame to be adjusted on the optical axis of the eccentricity measuring device;
And a curing unit that cures the adhesive that fixes the lens to be adjusted and the lens frame to be adjusted.

The invention according to claim 4 is the lens centering device according to claim 3,
The optical axis adjusting means is
A first drive mechanism for moving the lens to be adjusted in a direction substantially orthogonal to the optical axis of the decentration measuring device;
And a second drive mechanism that adjusts the inclination of the lens to be adjusted with respect to the optical axis of the decentration measuring device.

The invention according to claim 5 is the lens centering device according to claim 3 or 4,
Control means for controlling the first and second drive mechanisms based on an output from the eccentricity measuring device is provided.

The invention according to claim 6 is the lens centering device according to claim 3,
The optical axis adjusting means is
A first drive mechanism for moving the lens to be adjusted in a direction substantially orthogonal to the optical axis of the decentration measuring device;
A centering member that abuts on the optical surface of the lens to be adjusted and presses the lens to be adjusted, and the centering member adjusts an inclination of the eccentricity measuring device with respect to the optical axis.

The invention according to claim 7 is the lens centering device according to claim 3 or 6,
Control means for controlling the first drive mechanism and the centering member based on an output from the eccentricity measuring device is provided.

The invention according to claim 8 is the lens centering device according to any one of claims 3 to 7,
The positioning means includes
A third drive mechanism for moving the central axis of the lens frame to be adjusted in a direction substantially orthogonal to the optical axis of the eccentricity measuring device and positioning on the optical axis of the eccentricity measuring device;
The third driving mechanism is characterized in that the lens frame to be adjusted is moved by a deviation from a predetermined reference position and positioned.

The invention according to claim 9 is the lens centering device according to any one of claims 3 to 7,
The positioning means includes
An image processing device;
A third drive mechanism for moving the central axis of the lens frame to be adjusted in a direction substantially orthogonal to the optical axis of the eccentricity measuring device and positioning on the optical axis of the eccentricity measuring device;
The third lens driving mechanism is characterized in that the lens frame to be adjusted is positioned at a predetermined position based on position information of the lens frame to be adjusted detected by the image processing apparatus.

The invention according to claim 10 is the lens centering device according to claim 3,
A retracting mechanism for retracting and moving the lens holder in the optical axis direction of the eccentricity measuring device with respect to the lens unit set;
A rotation mechanism that contacts the outer periphery of the lens unit set and rotates the lens unit set,
It is possible to measure the amount of eccentricity of the lens unit set in which the centering and fixing of the lens to be adjusted is completed.

  According to the lens centering method and apparatus of the present invention, it is possible to adjust the eccentricity of the lens with high accuracy without increasing the processing accuracy of the lens frame that affects the centering of the lens. In addition, it is possible to easily perform the centering operation of a lens that requires a high level of technology, and to construct automation of the operation. As a result, the part processing cost can be reduced, the adjustment man-hours can be shortened, and the manufacturing cost can be reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Summary of Invention)
In the present invention, a lens frame (adjusted lens frame) 2 that accommodates a lens (adjusted lens) 1 is held by the lens holder 3 without placing the optical surface of the lens 1 in contact with the lens frame, and the lens optical axis. 20 and the central axis 16 of the lens frame 2 are made to coincide by adjusting the bias (shift) and the tilt (tilt).
(First embodiment)
1 and 2, the lens centering device 100 includes an eccentricity measuring machine 12 disposed above the apparatus main body, and a frame base 8 on which the lens frame 2 is placed. Have. The frame base 8 has a flat surface extending in a direction substantially orthogonal to the optical axis 12 a of the eccentricity measuring device 12. On the frame base 8, a lens frame abutting portion 9 for positioning the lens frame 2 and a lens frame presser 10 are provided so as to face the lens frame abutting portion 9. The lens frame 2 is positioned in a state of being sandwiched between the lens frame abutting portion 9 and the lens frame retainer 10. The frame base 8 can be moved in a direction substantially orthogonal to the optical axis 12a manually or by power by an XY stage 11 as a third drive mechanism, whereby the central axis 16 of the lens frame 2 (see FIG. 2). ) Can be positioned so as to coincide with the optical axis 12 a of the eccentricity measuring device 12. The eccentricity measuring machine 12 is connected to an eccentricity measuring machine control unit 13 and a television monitor 14.

  As shown in FIG. 3, a hole 8a concentric with the lens frame 2 is formed in the frame base 8, and the lens holder 3 is provided through the hole 8a. In the lens holder 3, the upper end portion on which the lens 1 is placed has a ring shape, and the lens 1 is placed on this portion. The lens 1 is sucked and held by vacuum through a passage 34 formed in the lens holder 3 (and the spindle 4) and the suction valve 5. The lens holder 3 is detachably attached to a spindle 4 as a rotation mechanism, and can be exchanged according to the size of the lens 1, its curved surface (R) shape, the attachment position to the lens frame 2, and the like. It has become.

  Further, as shown in FIG. 3, even if the lens frame 2 has a structure including the lens holding portion 30, a slight gap is provided between the lens 1 and the lens holding portion 30 so as not to be in direct contact. It has been. This is because, in the present embodiment, the lens 1 and the lens frame 2 are individually positioned and held, so that the lens holding unit 30 is not originally required for the lens frame 2 that houses the lens 1. . In addition, when the lens holding unit 30 also serves as an optical diaphragm, the lens 1 is attached so as not to contact the lens holding unit 30, thereby affecting the centering accuracy related to the processing accuracy of the lens holding unit 30. This is to eliminate it. A UV curable adhesive 26 described later is applied to the gap between the lens 1 and the lens frame 2 (or the lens holding unit 30), and the lens 1 and the lens are cured by curing the adhesive. The frame 2 is fixed integrally.

  As a material of the lens holding part 30, it is preferable to use a resin such as polyacetal so that the lens 1 is not scratched. Although not shown, the spindle 4 is rotated manually or by power, and the amount of eccentricity of the lens 1 with respect to the optical axis 12a can be detected by measuring the amount of shake at the time of rotation with the eccentricity measuring device 12. The lens holder 3 and the spindle 4 can be moved in an arbitrary direction manually or by power by an XY stage 6 as a first drive mechanism and a biaxial tilt stage 7 as a second drive mechanism. The posture of the lens 1 can be moved.

  That is, as shown in FIG. 4, the XY stage 6 moves in a direction substantially orthogonal to the optical axis 12 a of the eccentricity measuring device 12, whereby the deviation between the lens optical axis 20 and the central axis 16 of the lens frame 2 ( Shift) can be corrected. Further, the biaxial tilt stage 7 can correct the tilt (tilt) of the lens optical axis 20 and the central axis 16 of the lens frame 2 by tilting and moving with respect to the optical axis 12 a of the eccentricity measuring device 12. By these corrections, the lens optical axis 20 and the center axis 16 of the lens frame 2 are made to coincide with each other, and the centering operation of the lens 1 can be performed.

  After this centering operation is completed, as shown in FIG. 5, the UV curable adhesive 26 applied to the outer peripheral portion of the lens 1 is irradiated with ultraviolet rays by a UV light irradiation device 27 (see FIG. 1) as a curing means. Curing is performed, and the lens 1 is bonded and fixed to the lens frame 2. In this way, it is possible to obtain the lens unit set 40 that is integrally fixed in a state where the lens 1 and the lens frame 2 are eccentrically adjusted with high accuracy.

In the present embodiment, the case where the UV curable adhesive 26 that is cured by ultraviolet irradiation is used as the adhesive has been described. However, the present invention is not limited to this. For example, the adhesive is cured by heat or naturally dried. An adhesive or the like may be used.
(Second Embodiment)
In the first embodiment, the description is based on the assumption that the operator manually adjusts the eccentricity. However, the present invention is not limited to this. For example, the centering operation of the lens 1 can be automatically performed. That is, as shown in FIG. 6, the lens centering device 100 has a control device 21 as a control means for controlling the operations of the XY stage 6 and the biaxial tilting stage 7. According to the present embodiment, based on the measurement result of the deviation (shift) and tilt (tilt) of the lens 1 and the lens frame 2 by the eccentricity measuring device 12, the control device 21 causes the XY stage 6 and the biaxial tilt stage 7 to be measured. , And the XY stage 11 can be automatically controlled to automate the centering operation of the lens 1.
(Third embodiment)
7 and 8 show another embodiment of the lens centering device 100. In this embodiment, the lens centering device 100 is in contact with the spindle lifting mechanism 24 as a retracting mechanism for retracting and moving the lens holder 3 in the lens optical axis direction, and the lens frame 2 in contact with the outer periphery of the lens frame 2. And a lens frame rotation roller 23 as a rotation mechanism for rotating the lens. Then, centering and fixing of the lens 1 and the lens frame 2 are completed, and the lens holder 3 is moved downward in the lens optical axis direction with respect to the obtained lens unit set 40, and the lens unit by the lens holder 3 is moved. The support of the set 40 is released.

Next, with the lens unit set 40 placed on the frame base 8, the lens frame rotation roller 23 is brought into contact with the outer periphery of the lens unit set 40 to rotate the lens frame rotation roller 23. Then, the lens unit set 40 rotates around the central axis 16 of the lens frame 2, and thereby the amount of centering of the lens unit set 40 is measured by the eccentricity measuring machine 12. Thus, according to the present embodiment, the quality of the lens unit set 40 can be further improved by adding the step of inspecting the eccentricity of the lens unit set 40.
(Fourth embodiment)
9 and 10 show another embodiment of the lens centering device 100.

  In this embodiment, the operator centers the optical surface of the lens 1 without using the biaxial tilt stage 7 (see FIG. 1 and the like) for correcting the tilt of the lens optical axis 20 and the central axis 16 of the lens frame 2. It is brought into contact with a member (tweezers or the like) 15 to correct the inclination by shifting the mounting position of the lens 1 and the lens holder 3. In addition, the lens holder 3 and the spindle 4 can be moved by operating the XY stage 6 manually or with power, whereby the posture of the lens 1 can be moved.

That is, in the present embodiment, the XY stage 6 is moved in a plane substantially orthogonal to the optical axis 12 a of the eccentricity measuring device 12, so that the deviation (shift) between the lens optical axis 20 and the central axis 16 of the lens frame 2 is achieved. ) Can be corrected. In addition, the inclination of the lens optical axis 20 and the central axis 16 of the lens frame 2 is determined by the operator placing the centering member 15 in contact with the optical surface of the lens 1 and arbitrarily attaching the lens 1 and the lens holder 3 to each other. The inclination can be corrected by shifting to.
(Fifth embodiment)
In the above-described fourth embodiment, the description is based on the premise that the operator manually adjusts the eccentricity. However, the present invention is not limited to this, and for example, the centering operation of the lens 1 can be automatically performed. That is, in this embodiment, as shown in FIG. 11, the lens centering device 100 is added to the XY stage 6 that moves based on the eccentricity measurement result of the eccentricity measuring device 12 and the centering member 15. A centering member moving mechanism 22 and a control device 21 as control means for controlling the operation of the lens push-out amount are provided. According to the present embodiment, based on the measurement results of the deviation (shift) and tilt (tilt) of the lens 1 and the lens frame 2 by the decentration measuring device 12, the controller 21 controls the XY stage 6, the XY stage 11, and It is possible to automatically control the centering operation of the lens 1 by automatically controlling the centering member moving mechanism 22 and the like.
(Operation of this embodiment)
Next, the operation of the present embodiment will be described based on the flowchart of FIG.

  The first step includes S1 to S3, and initial setting is performed in the first step. That is, in S1, a lens unit set 40 (hereinafter referred to as a reference lens unit set 40) whose eccentricity is regulated with high accuracy is placed on the frame base 8, and the reference lens unit set 40 is used as a lens. The frame abutment portion 9 and the lens frame retainer 10 are fixed on the frame base 8. In this case, it is preferable that the reference lens unit group 40 ideally has the center axis 16 of the lens frame 2 and the lens optical axis 20 perfectly matched. However, the present invention is not limited to this, and it is sufficient that the amount of eccentricity from the central axis 16 of the lens frame 2 to the lens optical axis 20 and its direction are known.

  In S 2, the lens eccentric image of the reference lens unit set 40 is captured by the decentration measuring device 12, and the lens optical axis 20 of the reference lens unit set 40 and the optical axis 12 a of the eccentricity measuring device 12 are matched by moving the XY stage 11. Let Thereby, the optical axis 12a of the eccentricity measuring machine 12 and the central axis 16 of the lens frame 2 coincide. Further, when the lens optical axis 20 of the reference lens unit set 40 and the lens frame central axis 16 are decentered, the decentering amount e and direction are corrected by the XY stage 11 as shown in FIG. The optical axis 12a of the eccentricity measuring device 12 and the lens frame central axis 16 are made to coincide. The coincidence point is set as a reference position, which is the origin of the frame base 8. Then, the lens frame center axis 16 at this time is set as the center axis 16a of the reference lens frame 2 (see FIG. 13B). In S <b> 3, the reference lens unit set 40 is removed from the frame base 8.

The second step has S4 and S5. As shown in FIG. 13B, in S4, the adjusted lens frame 2 is fixed to the frame base 8 by the lens frame abutting portion 9 and the lens frame presser 10, and in S5, the XY stage 11 is moved, The center axis 16b of the lens frame 2 to be adjusted is made to coincide with the center axis 16a of the reference lens frame 2 described above.

  The third step has S6 and S7. In S6, the lens 1 with the UV curable adhesive 26 applied to the outer periphery of the lens is placed on the lens holder 3 and held by vacuum suction. In this state, the UV curable adhesive 26 is a semi-fluid and is not cured. In S7, the deviation (shift) and tilt (tilt) between the optical axis 12a of the eccentricity measuring device 12 and the lens optical axis 20 are corrected by the XY stage 6, the biaxial tilt stage 7, etc., and the lens optical axis 20 and the eccentricity are decentered. The optical axis 12a of the measuring machine 12 is made to coincide and the centering operation is performed. As a result, the lens optical axis 20 and the central axis 16 of the lens frame 2 coincide with each other.

  The fourth step has S8. In S8, the lens 1 and the lens frame 2 that have been centered are irradiated with UV light by the UV irradiation device 27 to cure the UV curable adhesive 26, and the lens 1 and the lens frame 2 are centered and fixed. To do.

The fifth step has S9. In this S9, when the completed lens unit set 40 is inspected, the eccentricity of the lens unit set 40 is measured to determine whether it is acceptable.
Subsequently, in S10, the vacuum suction of the lens holder 3 is stopped, the vacuum suction is released, and the holding of the lens 1 is released. Further, the spindle 4 to which the lens holder 3 is attached is lowered by the spindle lifting mechanism 24, and the lens holder 3 is pulled away from the optical surface of the lens 1 so that the measurement posture is not affected. Further, in S11, it is determined whether or not the same centering operation is performed. If YES, the process returns to S4, and if NO, the process returns to S1.

Next, the case where the central axis 16a of the reference lens frame 2 of the reference lens unit set 40 and the lens optical axis 20 do not coincide with each other in S5 described above will be described.
In this case, as shown in FIG. 13B, the outer diameter 17a of the reference lens frame 2 and the outer diameter 17b of the lens frame 2 to be adjusted are measured by the eccentricity measuring device 12, and each of them is measured from the lens abutting portion 9. The distance difference f to the center axis 16a of the reference lens frame 2 is calculated, and an amount corresponding to the deviation from the center axis 16a of the reference lens frame 2, that is, the origin of the frame base 8 set in the first step is calculated. The XY stage 11 is moved in parallel with the lens abutting portion 9. Thereby, the center axis 16b of the lens frame 2 to be adjusted is made to coincide with the optical axis 12a of the eccentricity measuring device 12. In this case, when calculating the distance from the lens abutting portion 9 to the central axis 16 a of the reference lens frame 2, it is necessary to consider the positional deviation of the contact surface between the lens frame 2 and the lens abutting portion 9. The degree of influence of the positional deviation amount varies depending on the opening angle α of the lens abutting portion 9. The larger the angle α is, the smaller the influence becomes. Therefore, it is preferable to set the angle α large within a range in which the lens frame 2 can be stably held.

Furthermore, when using the eccentricity measuring device 12 provided with a television camera (not shown) or the eccentricity measuring device 12 in which the television camera is installed on the optical axis 12a, the television camera is placed on the optical axis 12a. A photographed image of the lens frame 2 to be adjusted is captured, and the position of the center of gravity of the lens frame 2 to be adjusted (that is, the central axis 16b of the lens frame 2 to be adjusted) is detected by an image processing device (not shown). Then, the control unit 21 (see FIG. 6) moves the XY stage 11, and the central axis 16 of the lens frame 2 to be adjusted.
b is automatically matched with the optical axis 12a of the eccentricity measuring machine 12.

It is an external view of the lens centering device of the present embodiment. It is a sectional front view same as the above. It is principal part sectional drawing of a modification same as the above. It is principal part sectional drawing same as the above. It is a cross-sectional front view of a lens part group. It is a figure which shows the flowchart of this Embodiment. (A) and (b) are the XX direction arrow views of FIG. 2, respectively. It is an external view of the centering device of the lens of other embodiment. It is a figure which shows embodiment which added the eccentricity measuring mechanism to the centering apparatus of a lens. It is a sectional front view same as the above. It is an external view of the centering device of the lens of other embodiment. It is a sectional front view same as the above. It is an external view of the centering device of the lens of other embodiment. It is an external view of the conventional lens centering device. It is a sectional front view same as the above. It is a figure which shows the external appearance structure of the conventional centering apparatus of a lens. (A) (b) is explanatory drawing of the centering method in FIG. 14, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens 2 Lens frame 3 Lens holder 4 Spindle 5 Vacuum suction valve 6 XY stage 7 Biaxial tilt stage 8 Frame base 9 Lens frame abutting part 10 Lens frame holder 11 XY stage 12 Eccentricity measuring device 12a Optical axis 15 Centering Member 16 Lens frame center axis 16a Reference lens frame center axis 16b Adjusted lens frame center axis 17a Reference lens frame outer diameter 17b Adjusted lens frame outer diameter 20 Lens optical axis 21 Controller 23 Lens frame rotation roller 24 Spindle lifting mechanism 26 UV curing type Adhesive 27 UV light irradiation device 30 Lens holding unit 40 Lens unit set 100 Lens centering device

Claims (10)

Adjustment is made so that the optical axis of the lens to be adjusted and the center axis of the lens frame to which the lens to be adjusted is attached coincide with each other, and after the adjustment, the lens to be adjusted is fixed to the lens frame to be adjusted. In the lens centering and fixing method,
Setting a predetermined reference position by matching the optical axis of the eccentricity measuring device and the lens optical axis of the lens unit set as a reference;
Positioning the central axis of the lens frame to be adjusted at the reference position after removing the reference lens unit set; and
Placing the lens to be adjusted, which is coated with an adhesive on the outer periphery, on a lens holder, and adjusting the eccentricity by matching the optical axis of the lens to be adjusted with the optical axis of the eccentricity measuring device;
Fixing the lens to be adjusted and the lens frame to be adjusted with the adhesive after decentering adjustment,
A method for centering a lens. Holding the lens to be adjusted so that its optical surface does not contact the lens frame to be adjusted;
The lens centering method according to claim 1, wherein: Adjustment is made so that the optical axis of the lens to be adjusted and the center axis of the lens frame to which the lens to be adjusted is attached coincide with each other, and after the adjustment, the lens to be adjusted is fixed to the lens frame to be adjusted. In the lens centering device to obtain
An eccentricity measuring device for measuring the eccentricity of the optical axis of the lens to be adjusted;
A lens holder that holds the lens to be adjusted by vacuum suction;
A rotation mechanism for rotating the lens holder;
Optical axis adjusting means for adjusting the eccentricity of the optical axis of the lens to be adjusted;
Positioning means for positioning the central axis of the lens frame to be adjusted on the optical axis of the eccentricity measuring device;
Curing means for curing an adhesive that fixes the lens to be adjusted and the lens frame to be adjusted.
A lens centering device. The optical axis adjusting means is
A first drive mechanism for moving the lens to be adjusted in a direction substantially orthogonal to the optical axis of the decentration measuring device;
A second drive mechanism that adjusts an inclination of the lens to be adjusted with respect to the optical axis of the decentering measurement device,
The lens centering device according to claim 3. Control means for controlling the first and second drive mechanisms based on the output from the eccentricity measuring device,
5. The lens centering device according to claim 3, wherein the lens centering device is provided. The optical axis adjusting means is
A first drive mechanism for moving the lens to be adjusted in a direction substantially orthogonal to the optical axis of the decentration measuring device;
A centering member that abuts on the optical surface of the lens to be adjusted and presses the lens to be adjusted, and adjusts the inclination of the eccentricity measuring device with respect to the optical axis by the centering member.
The lens centering device according to claim 3. Control means for controlling the first drive mechanism and the centering member based on the output from the eccentricity measuring device,
The lens centering device according to claim 3 or 6, characterized in that The positioning means includes
A third drive mechanism for moving the central axis of the lens frame to be adjusted in a direction substantially orthogonal to the optical axis of the eccentricity measuring device and positioning on the optical axis of the eccentricity measuring device;
The third drive mechanism moves and positions the adjusted lens frame by a deviation from a predetermined reference position.
The lens centering device according to claim 3, wherein the lens centering device is provided. The positioning means includes
An image processing device;
A third drive mechanism for moving the central axis of the lens frame to be adjusted in a direction substantially orthogonal to the optical axis of the eccentricity measuring device and positioning on the optical axis of the eccentricity measuring device;
The third drive mechanism positions the adjusted lens frame at a predetermined position based on position information of the adjusted lens frame detected by the image processing device.
The lens centering device according to claim 3, wherein the lens centering device is provided. A retracting mechanism for retracting and moving the lens holder in the optical axis direction of the eccentricity measuring device with respect to the lens unit set;
A rotation mechanism that contacts the outer periphery of the lens unit set and rotates the lens unit set,
It was possible to measure the amount of decentering of the lens unit set in which the lens to be adjusted was centered and fixed,
The lens centering device according to claim 3.