JPH08257885A - Method and device for centering lens - Google Patents

Abstract

PURPOSE: To high accurately change centering work of an optical lens by counting a number of work times of lens centering work, applying correcting work of a lens centering tool after a prescribed number of centering times, and performing again lens centering work after this correcting work. CONSTITUTION: By deforming a point end shape of lens holders 2g, 4h, an error is generated in a position of holding a lens from the lens holders 2g, 4h of predetermined prescribed shape, to generate a deviation in a centering position by the first/second grinding wheels. In order to prevent this deviation, at each work of a prescribed number of lenses, a shape of the lens holders 2g, 4h is connection worked by correction work units 15, 16. This correction work unit 15, 16 is mounted on an X-axis slider 10g respectively of the first/second centering units. After correction work thus performed, lens centering work is again performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centering method and centering device for optical element members such as lenses.

[0002]

2. Description of the Related Art A lens for a precision optical device such as a camera is housed in a lens barrel by aligning each lens on the optical axis to form a subject image by arranging the plurality of lenses on the optical axis. To do.

Therefore, in order to align the optical axis of each lens, it is necessary to align the optical axis of each lens with each other. Therefore, the outer peripheral surface of the lens is processed to perform centering (centering) of the lens.

A conventional lens centering operation is disclosed in Japanese Patent Application Laid-Open No. 57-
As disclosed in Japanese Patent No. 71768, the lens to be processed is held by a lens holder and is rotated by a lens rotation motor, the grinding wheel is rotated by a second motor, and the grinding wheel is moved by a cam mechanism to perform centering. Is configured to do.

Further, Japanese Patent Application Laid-Open No. 59-209748 discloses a structure in which a centering lens is suction-held by a bell clamp mechanism.

There are two types of optical lenses, which are the subject of lens processing in this technical field, including spherical lenses and aspherical lenses.
The spherical portion of the optical surface of the spherical lens is processed by grinding and polishing to achieve a desired surface roughness accuracy.

For the aspherical lens, in addition to the above-mentioned grinding and polishing, a method for processing the aspherical surface by press working has been established at present.

Although the method by polishing is technically established and there is a certain accuracy guarantee, it is necessary to automate the technique such as requiring the skill of a veteran worker to set the lens on the device and set the processing tool. There is a lack of efforts.

In the centering processing of the lens, the processing amount is estimated for each lens to be processed, and the centering amounts of the light incident side and the light emitting side of the lens optical surface are processed according to the design value of the optical lens. There must be.

These operations must be performed regardless of the number of processed lots.

It is also possible to combine the conventional lens polishing / centering processing device with a robot to configure the device system so as to perform the pickup operation from the lens pallet and the automatic setting to the processing machine. In this case, there is a variation in the processing accuracy of the lens after processing due to the lack of a step of correcting the variation in the dimensional accuracy of each lens to be processed.

Further, as a method for centering and clamping a lens, Japanese Patent Laid-Open No. 160051 discloses a method for clamping a lens when the lens is clamped by opposing cup bodies provided in a lens holding device. It is shown that the upper cup body is rotated toward the lens mounted on, and is moved forward at a low pressure at a low speed to clamp the lens.

In the conventional centering device, the centering process is advanced, and the capability of the grindstone is reduced due to the abnormal shape of the machined lens, and the life of the grindstone is improved depending on the shape of the grindstone.

In the flow of the steps of automating the lens processing, that is, the lens blank processing, the grinding and polishing of the lens optical surface, and the processing of the lens outer peripheral surface and the chamfered portion, those steps are performed. If it is automated with an automatic machine, it can be expected to improve productivity, but depending on the composition of the glass material of the lens, the amount of processing to be processed will differ depending on the lens, and the shape of the processing tool and grindstone will change subtly. This will affect the lens processing accuracy.

In the lenses of the conventional optical equipment and the like, there are lenses for various uses depending on the composition of the glass material used in terms of light transmittance, workability, gloss of the glass surface, etc. Movement of the lens in the manufacturing process,
There was a high frequency of lens breakage accidents during various processes such as transportation, pickup, insertion, and assembly.

In the optical lens, not only the optical function surface is damaged, but even a slight damage to the outer peripheral surface of the lens causes a trouble in assembling the lens, and damage or damage may cause the debris to affect other lenses. Careful handling is required in case of occurrence. Even with such sufficient care, it is not completely possible to prevent lens damage accidents by automating the lens processing process and handling it manually.

Conventionally, as shown in FIG. 1, when a lens whose outer peripheral portion and a main chamfered portion have been processed is manually transferred to a cleaning basket for a cleaning step as shown in FIGS.
As shown in the enlarged view of Fig. 2, there are many accidents that cause damage called "chip" or "pig" in the lens portion between the outer peripheral portion and the main chamfer when inserting into the basket, and depending on the degree of damage, the lens may be defective. There was a problem.

[0018]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and its main purpose is to achieve high precision centering of an optical lens and
(EN) A centering method and a centering device capable of automating a high-speed lens centering process.

Another object of the present invention is to provide a method for efficiently and quickly performing centering of a lens to be processed on a processing holder in the lens centering processing step without increasing the cost of the apparatus. It is to be.

Still another object of the present invention is to enable continuous processing steps such as lens outer peripheral processing and lens centering processing in lens processing, and care about the shape of the grindstone of the centering processing tool. It is to provide a centering device that is left to the machine without any action.

Still another object of the present invention is to provide a centering device capable of maintaining the accuracy of automation of lens processing by maintaining the lens holding state in a constant state by correcting the lens holder. Is.

Still another object of the present invention is to prepare a supply state of the next lens to be processed during processing by the processing machine, and when the processing of the lens being processed is completed, the operation of exchanging the processed material to the processing machine is performed. An object of the present invention is to provide a device that can be efficiently used.

[0023]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, a lens centering method according to the present invention is a method of clamping both sides of a lens with lens holders to center the outer circumference of the lens, and counting the number of times of the centering processing of the lens. However, the lens centering tool is corrected after a predetermined number of times of centering, and the lens is centered again after the correction.

The lens centering device according to the present invention is a device for centering the outer circumference of a lens by clamping both sides of the lens with lens holders, and fixing the lens to a fixed lens holder unit and a movable lens holder. A core holder, and first and second centering grindstone units are arranged on both sides of the holding shaft of the lens holder, and lens holder correction processing means is arranged in the vicinity of the centering unit. It is characterized in that it is provided with means for counting the number of times of centering processing by the grinding wheel and control means for activating the lens holder correction processing means based on a signal from the counting means.

The lens processing method according to the present invention is
A lens processing method in which both sides of a lens are held by a lens holder and the processing information is processed by controlling the processing information by a control means, wherein the processing means corrects the processing information for correcting the lens holding portion of the lens holder. It is characterized by inputting to and correcting.

The lens clamping method in the lens centering device according to the present invention is a device for centering the outer circumference of a lens by clamping both sides of the lens with lens holders. And the movable side lens holder unit, and the first axis on each side of the lens holder holding shaft.
And a second centering grindstone unit are arranged, and the first and second centering grindstone units are controlled to move in a direction parallel to and perpendicular to the holding shaft to center the lens. In this case, one of the lens holders maintains the holding state of the lens, and at the time of the holding state, oil is applied to at least one surface or both surfaces of the lens, and then the other lens holder is moved. It is characterized in that the lens is sandwiched.

The lens clamping device in the lens centering device according to the present invention is a device for centering the outer circumference of a lens by clamping and holding both sides of the lens with lens holders. And the movable side lens holder unit, and the first axis on each side of the lens holder holding shaft.
The second centering grindstone unit is arranged, and the oil applying means is operated by a signal from the signal generating means for confirming the lens suction operation of the lens holder.

Further, the centering grindstone according to the present invention is a centering grindstone for centering the outer circumference of the lens, wherein a lens outer diameter machining portion is formed on the outer peripheral surface of the substantially disk-shaped main body centered on the machining point axis of the grindstone. And a first and a second lens chamfer connecting the both side surfaces of the disc-shaped body and the lens outer diameter processed portion in a direction from the lens outer diameter processed portion toward the rotation axis. It has a feature.

The centering grindstone according to the present invention is characterized in that a minute chamfered portion is provided between the lens outer diameter processed portion and the lens chamfered portion.

Further, the lens centering method according to the present invention has a pair of centering grindstones sandwiching a lens holder for clamping and holding the lens, and the centering grindstones are surfaces of the lenses facing each other. The feature is that it is operated to perform centering.

Further, in the lens centering method according to the present invention, the movement path of the centering grindstone is from the outer peripheral portion of the lens toward the main chamfered surface of the lens, and subsequently, the minute chamfered surface is processed. It is characterized by doing so.

In the lens according to the present invention, the lens to be processed is sandwiched by holding means, and the first and second centering tools are arranged at positions orthogonal to the optical axis of the lens,
The outer peripheral surface of the lens to be processed is simultaneously processed by rotating the first and second tools.

Further, the lens according to the present invention is characterized by having a minute chamfered surface between the outer peripheral portion of the lens and the main chamfered surface of the lens.

The lens centering device according to the present invention further comprises a housing means for housing a plurality of lenses to be machined, a plurality of centering means for centering the lens to be machined, and the machined object. Holding means for holding the lens in a position for centering processing, supply means for supplying the processed lens to the holding means, and positioning means for performing positioning when supplying the processed lens to the holding means, And a transfer unit that transfers the lens to be processed from the positioning unit to the holding unit.

The lens centering device according to the present invention is a device for centering the outer circumference of a lens by clamping and holding both sides of the lens with lens holders, and the lens is fixed side lens holder unit and movable side lens holder. Unit, and the first and second centering grindstone units are arranged on both sides of the holding shaft of the lens holder, and the first and second centering grindstone units are arranged with respect to the holding shaft. Driving means for controlling movement in parallel and vertical directions and a lens to be processed from a holding position of the unprocessed lens, and changing the supply attitude to the lens holder. And a transfer means for supplying and transferring.

Further, in the lens centering device according to the present invention, the transfer means receives the processed lens held in the lens holder and receives and supplies the next unprocessed lens to the lens holder. It is characterized by having.

Further, in the lens centering system according to the present invention, a clamping means for clamping the lens to be centered, a pair of centering means for processing the centering portion of the clamped lens, and the clamping means are processed. Carrying-in / carrying-out means for carrying in and carrying out a lens to be carried out, first control means for controlling the centering means by inputting information of a working process of the lens to be worked, and the first control means in cooperation with It is characterized by comprising a clamp means and a control second control means for controlling the carry-in / carry-out means.

[0038]

BEST MODE FOR CARRYING OUT THE INVENTION An apparatus according to an embodiment of the present invention will be described below with reference to FIGS.

1. Outline of the centering machine device The present centering machine comprises a base portion 1 of the main body of the apparatus, a fixed side lens holder unit 2, a movable side lens holder unit 4, a lens thickness measurement unit 6 for processing, and a first centering grindstone unit 8 , A second centering grindstone unit 10, an automatic hand unit 12, an automatic hand moving unit 14, a lens holder correction processing unit 16, a lens alignment unit 18, a lens supply / discharge stocker 20, and the like.

The base portion 1 has an upper surface 1a, and the above-mentioned units are arranged on the upper surface 1a.

Numerals X, Y and Z in the drawing indicate coordinate axes on the surface of the base portion 1.

2. The fixed-side lens holder unit 22 indicates a fixed-side lens holder unit, and 2a indicates a fixed shaft support portion attached to the base portion 1.
A main shaft rotation motor M-1, a rotation transmission shaft 2b, a lens rotation shaft 2c, and a fixed shaft side bearing 2d are attached to a, and rotation of the motor M-1 is transmitted to the rotation transmission belts 2e, 2a.
It is transmitted to the fixed-side lens holder 2g that is axially supported by the bearing 2d by f, and this holder 2g is rotated about the Z axis shown as the coordinate axis. A through hole is provided at the center of the axis of the lens rotation shaft 2c, and this hole is connected to a suction means (not shown) so that the lens holder 2g can suck and hold the lens.

3. The movable side lens holder unit 44 indicates a movable side lens holder unit, and 4a is a movable side unit supporting base member fixed to the base portion 1, and a convex guide is formed on the upper surface of the base member 4a. There is.

A coarse movement motor M-2 for coarsely moving the movable lens holder 4b and a coarse movement encoder unit 4c are provided at one end of the base member 4a.

Reference numeral 4d denotes a coarse movement slider member fitted into the convex guide of the base member, and 4e denotes an L-shaped angle member mounted on the coarse movement slider member 4d, which is a rotary shaft of the coarse movement motor M-2. It is screwed to the feed screw connected to.

A cylinder S-1 for fine movement and pressurization of the movable lens holder is attached to the L-shaped angle member 4e.

Reference numeral 4f denotes a moving shaft support base for axially supporting the movable lens holder, which is fixed on the base 1. The moving shaft support base 4f pivotally supports the rotation transmission shaft 2b of the fixed lens holder unit 2 described above,
Further, the lens clamp moving shaft 4g is axially supported. 4h is a bearing for the lens clamp moving shaft 4g, and 4i is a rotation transmission belt.

The distance d between the fixed lens holder 2g and the movable lens holder 4b is shown as a considerably large distance in FIG. 4 for the sake of clearly showing the structure of the apparatus. Is a distance which is about several times the wall thickness of the lens to be processed, and is set to such a distance that the lens to be processed can be clamped by the movement stroke of the coarse movement slider member 4d and the cylinder S-1.

4. Workpiece lens thickness measuring unit 6 The workpiece lens thickness measuring unit is the cylinder S.
Disk 6a for lens thickness measurement fixed to the piston of -1
And a measuring sensor 6b attached to the L-shaped angle member 4e and extending in the direction of the disk 6a, and a wall thickness calculating means described later.

5. A first centering grindstone unit (NC1) 8a is a support base for the first centering unit that holds the first centering grindstone unit, and is an upper surface 1 of the base 1.
It is fixed to one end of a.

Reference numeral 8b is a Z-axis slide guide fixed in the Z-axis direction on the support base 8a, and is formed so that a convex portion is formed on the upper surface thereof to guide the slider 8c.

8d is a motor for Z-axis feed of the first grindstone unit, 8e is an encoder, 8f is a ball screw for moving and guiding the slider 8c, and is connected to the rotary shaft of the motor 8d.
A slider 8c is screwed into the intermediate portion.

An unillustrated convex guide extending in the X-axis direction is formed on the slider 8c, and an X-axis slider 8g for sending the first grindstone 8A in the X-axis direction is fitted to the convex guide. There is.

A motor 8h for rotating the first grindstone is attached to the X-axis slider 8g, and a first grindstone 8A is attached to the rotating shaft of the motor 8h. A lens holder correction processing unit 15, which will be described later, is arranged at a position beside the motor 8h on the X-axis slider 8g.

The first grindstone 8A is driven in the X-axis direction by an X-axis motor 8i of an X-axis slider 8g, an encoder 8j, a ball screw (not shown) and the like.

Therefore, the first grindstone 8A is the Z-axis motor 8
It is configured to be moved in the Z-axis direction by d and in the X-axis direction by the X-axis motor 8i, and rotation of the grindstone is performed by the motor 8h.
Performed by. Lens holder correction processing unit 1
Similarly, 5 is moved in the X-axis direction and the Z-axis direction.

6. The second centering grindstone unit (NC2) 10a is a support base for the second centering unit that holds the second centering grindstone unit, and is fixed to the other end of the upper surface 1a of the base 1. There is.

Reference numeral 10b is a Z-axis slide guide fixed in the Z-axis direction on the support base 10a, and has a convex portion formed on the upper surface thereof to guide the slider 10c. 10d is a motor for Z-axis feed of the second grindstone unit, 10e is an encoder, 10f is a ball screw for moving and guiding the slider 10c, which is connected to the rotary shaft of the motor 10d, and the slider 10c is screwed in the middle part thereof. There is.

A convex guide 10c-1 extending in the X-axis direction is formed on the slider 10c, and the second grindstone 10A is fed to the convex guide 10c-1 in the X-axis direction.
The shaft slider 10g is fitted.

A motor 10h for rotating the second grindstone is attached to the X-axis slider 10g, and a second grindstone 10A is attached to the rotating shaft of the motor 10h. Also,
A lens holder correction processing unit 16 to be described later is arranged at a position beside the motor 10h on the X-axis slider 10g.

The second grindstone 10A includes an X-axis motor 10i, an encoder 10j, a ball screw 1 on the X-axis slider 10g.
It is driven in the X-axis direction by 0k or the like.

Therefore, the second grindstone 10A is constructed to be moved in the Z-axis direction by the Z-axis motor 10d and in the X-axis direction by the X-axis motor 10i, and the grindstone is rotated by the motor 10h. Similarly, the lens holder correction processing unit 16 is also moved in the X-axis direction and the Z-axis direction.

7. The auto hand unit 12a is an auto hand Z-axis slider driven by an auto hand moving unit 14 described later. Reference numeral 12b is an auto hand unit holder fixed to the Z-axis slider 12a and extending in the Y-axis direction. The unit holder 12b is provided with a convex guide 12b-1 and a Y-axis slider 12c is fitted therein. . 12d is a motor for driving in the Y-axis direction attached to the auto hand unit holder 12b, 12e is an encoder, and 12f is a Y-axis slider 12 connected to the rotary shaft of the Y-axis motor 12d.
It is a ball screw for moving c.

Reference numeral 12g is a cylinder for driving the fingers to rotate, which is attached to the Y-axis slider 12c.

Reference numeral 12h designates a finger plate, which is rotatably held by an attachment plate attached to the Y-axis slider 12c about an axis parallel to the X-axis as a rotation axis. By the turning drive cylinder 12g, as shown by an arrow B in FIG.

The finger plate 12h includes a lens supply finger 12i and a lens ejection finger 12h.
j is attached as shown in FIG. These lens supply fingers 12i and lens ejection fingers 12i
j is a hole 13 for vacuum suction at the center as shown in FIG.
A rubber pad 13c is attached to the finger body 13b in which a is formed.

8. The automatic hand moving unit 14a is an automatic hand base attached to the other end of the base portion 1, and a convex guide extending in the X-axis direction is formed on the base, and the automatic hand X-axis slider 14b is provided.
Are fitted.

Reference numeral 14c is a motor for driving the automatic hand X-axis, and 14d is an encoder.

Reference numeral 14e is a ball screw which is rotated by the motor 14c to move the slider 14b.

Reference numeral 14f is a guide plate for the Z axis of the auto hand attached to the X axis slider 14d, and has a convex guide extending in the Z axis direction for guiding the Z axis slider 12a of the auto hand.

14 g is a motor for driving the automatic hand Z-axis,
14h is an encoder.

9. The lens holder correction processing units 15 and 16 correct the shapes of the lens holding portions of the fixed lens holder 2g and the movable lens holder 4b.

Since the lens holders 2g and 4b hold the lens to be processed in pressure contact with each other by high pressure, the tip shape thereof is gradually deformed as the lens is repeatedly attached and detached.

Due to the deformation of the tip shape of the lens holder, an error occurs in the lens holding position with respect to the lens holder having a predetermined shape, and the centering position is deviated by the first and second grindstones. . To prevent this,
Each time a predetermined number of lenses are processed, lens holders 2g, 4
Correct the shape of b.

The lens holder correction processing unit 15,
Reference numerals 16 are on the X-axis slider 8g of the first centering unit 8 and the X-axis slider 10 of the second centering unit 10, respectively.
mounted on g. In FIG. 7, the correction processing unit 15 is for rough cutting, and the correction processing unit 16 is for finish cutting.

Since the correction processing units 15 and 16 have exactly the same configuration, the correction processing unit 16 will be described as a representative of them. 16a is a bite holding plate that holds the tool holders bite 16b and 16c for correction processing. , The bite holding plate 16a is the X-axis slider 1
The turning shaft 16 is attached to the protrusions 16b-1 and 16b-2 for the turning holding portion provided on the bite base 16h fixed to 0 g.
It is rotatably held by d.

16e is the cutting tool holding plate 16a.
Is an actuating cylinder for swiveling the machine to a correction processing position and a standby position. A piston 16f of the cylinder 16e is rotatably engaged with an intermediate portion of the bite holding plate 16a. Tool holder plate 16a is cylinder 1
It is configured to be switched between the correction processing position and the standby position by the operation of 6e.

In FIG. 7, the correction processing unit 1
6 is shown with the cutting tool holding plate 16a brought to the correction processing position, and the correction processing unit 15 is shown.
Is shown with the bite holding plate 15a brought to the standby position.

10. The lens alignment unit 18 is a lens alignment unit for aligning the lens at a predetermined position when the lens is sucked and held by the auto hand unit 12.

The lens alignment unit 18 aligns the lens unit with the lens before the lens is picked up from the stocker 20 by the lens transport robot and sucked and held by the finger unit on the fixed lens holder by the lens transfer robot described later. The lens is corrected from the stocker by the robot on the suction finger 18c and the motor 18b is rotated to correct the lens position.

Reference numeral 18a is a holder, and 18b is a motor.

A suction finger 18c for lens positioning is attached to the upper end of the rotation shaft of the motor 18b, and the holding table 18a is supported by bearings concentrically around the rotation shaft at 120 degree intervals. Three rotating shafts 18d
1, 18d2, 18d3 are supported, and three rotation transmission belts 18e are provided between the rotation shaft of the motor and the three rotation shafts.
1, 18e2 and 18e3 are stretched.

The three rotation transmission belts 18e1 and 18e
e2 and 18e3 have indexing claws 18f1, 18f2 and 18f
3 is attached to the lens on the suction finger 18c by the rotation of the motor 18b so that the lens position is corrected and adjusted to the center position of the suction finger 18c by the three indexing claws.

11. Lens supply-Discharge stocker 20 is a lens supply provided adjacent to the centering machine body-
It is a stocker for discharging.

Reference numeral 20a denotes a stocker body frame for accommodating a pallet for accommodating lenses, and elevators 20b and 20c as first and second elevating means are provided at the lower part of the body frame 20a.
Are provided, and pallets P1, P2, ... In which lenses are stored are stacked and placed on the elevator 20b.

Reference numeral 20A denotes a scalar type robot which picks up and conveys the lens, transfers the lens in the uppermost pallet of the first elevator 20b to the lens alignment unit, and is centered again to make the lens alignment unit. Put the lens back into the
It has a function of transferring to the cleaning basket pallet 20d.

At this time, although the optical function surface of the lens is placed in the vertical direction on the pallet P in which the unprocessed lens is housed, the lens is centered and returned to the lens alignment unit, and again. When the robot 20A picks up and transfers the processed lens to the cleaning basket pallet, as shown in the drawing, the lens is set upright,
Store.

The posture of the lens is changed to the cleaning basket pallet in order to improve the drainage of the cleaning liquid in the next cleaning process.

The lenses are sequentially picked up from the pallet in which the lenses are stored, and the robot transfers the lenses from the pallet P1 to the lens alignment unit to the cleaning basket pallet, and when the lenses on the top pallet become empty,
The uppermost pallet is sent out onto the second elevator 20c, the first elevator 20b moves up one stage, and the second pallet P2 moves to the robot pick-up position.

When the uppermost pallet of the second elevator 20c on the lens supply side is fully loaded and the pallet of the first elevator 20b is empty, the second elevator 20c is lowered by one stage and the empty pallet of the second elevator is moved to the first elevator 20.
sent to b.

The discharge side is provided with third and fourth elevators (not shown), holds the cleaning basket pallet in the third elevator, and stands up and stores the processed lens as described above. .

An empty cleaning basket pallet (not shown) is laminated on the fourth elevator.

When the cleaning basket pallet of the third elevator is full of processed lenses, the third elevator moves down one step,
Along with that, the cleaning basket pallet on the fourth elevator is sent out toward the third elevator.

12. Description of Control Block Diagram FIG. 9 shows a control block diagram of the present apparatus.

22A is a data processing computer for numerical control, and 22B is a processing control computer.

The computer of 22B has ROM, RA
M and CPU are built in.

Reference numeral 22C is a terminal personal computer for operating the printer 22D for printing out data information.

Reference numeral 22a denotes a driver (control circuit) for driving the X-axis motor 8i of the first centering machining grindstone unit (NC1), which rotates the X-axis motor 8i in response to a signal from the machining control computer 22B. Control.

Reference numeral 22b is a detector for receiving a signal from an encoder 8j connected to the X-axis motor 8i of the NC1. The output of the detector is input to the data processing computer 22A.

Reference numeral 22c is a driver for driving the Z-axis motor 8d of the NC1, and the processing computer 22
The control signal from B controls the rotation of the Z-axis motor 8d.

Reference numeral 22d is a detector for receiving a signal from the encoder 8e connected to the Z-axis motor 8d of the NC1. The output of the detector is input to the data processing computer 22A.

Reference numeral 22e denotes a driver (control circuit) for driving the X-axis motor 10i of the second centering grinding wheel unit (NC2).
The rotation of the X-axis motor 10i is controlled by the signal from 2B.

Reference numeral 22f is a detector for receiving a signal from an encoder 10j adjacent to the X-axis motor 10i of the NC2, and the output of the detector is inputted to the data processing computer 22A.

Reference numeral 22g denotes a driver for driving the Z-axis motor 10d of the NC2, and the processing computer 2
The rotation of the Z-axis motor 10d is controlled by the control signal from 2B.

Reference numeral 22h is a detector that receives a signal from the encoder 10e connected to the Z-axis motor 10d of the NC2, and the output of the detector is input to the data processing computer 22A.

Reference numeral 22i denotes a driver for driving the automatic hand Y-axis (up / down) motor 12d, which is driven by a signal from the processing control computer 22B.
Control the rotation of d.

Reference numeral 22j is a detector for receiving a signal from the encoder 12e connected to the Y-axis motor 12d, and the output of the detector is input to the data processing computer 22A.

Reference numeral 22k is a driver for driving the automatic hand Z-axis (front / rear) motor 14g, and the Z-axis motor 14 is driven by a signal from the processing control computer 22B.
Control the rotation of g.

Reference numeral 22l denotes a detector that receives a signal from the encoder 14h connected to the Z-axis motor 14g, and the output of the detector is input to the data processing computer 22A.

Reference numeral 22m is the processing control computer 22.
This is an inverter for controlling the rotation of the motor M-1 that rotates the lens holders 2g and 4b that clamp the lens in response to a signal from B.

22n is the first centering unit (NC1) 8
Is an inverter of the grindstone rotating motor 8h, and the motor 8 is driven by a signal from the processing control computer 22B.
Control h.

22o is the second centering unit (NC2) 1
It is an inverter of the grindstone rotation motor 10h of 0 and controls the motor 10h by a signal from the processing control computer 22B.

Reference numeral 22p is the lens wall thickness measuring sensor 6
It is a signal processing means for inputting the signal from b and sending the detection signal to the data processing computer.

Reference numeral 22q is a control unit of the robot 20A.

22R is an operation panel.

13. Description of Operation Next, the operation of the apparatus will be described based on a flowchart.

First, the lens processing program M1 and the lens correction processing program M2 are input and stored in the ROM of the program storage unit of the processing control computer 22B through the data processing computer 22A by the operation panel 22R (step S- 1).

Next, the control data of the robot is input to and stored in the robot controller 22q (step S-
2) Bring the main body of the centering machine, the stocker, and the robot into a state ready for automatic operation (step S-3).

In this ready state, the origin position signal of the coarse movement encoder 4c of the movable side lens holder unit of the centering machine, the origin position signal of the fine movement cylinder S-1, and the first and second centering grindstone units. Check the preparation status of the entire system by checking the origin position signal of the slider, the origin position signals of the auto hand movement unit, etc., and the origin position signal of the robot, the origin position signals of the elevators in the stocker, etc. Step S-4).

Upon completion of the automatic driving preparation state, the robot performs the suction operation of the lens on the uppermost pallet of the first elevator 20b of the stocker in response to the preparation completion signal from the computers 22A and 22B (step S).
-5).

The lens suction operation in step S-5 is confirmed by the suction signal of the suction portion in the finger portion of the robot 20A. If no suction signal is output, the lens suction operation is continuously performed three times (step S- 6).

In step S-6, if the non-suction signal of the suction operation of the robot finger is output three times, the robot judges that there is no lens at the pallet position and moves to the next position in the pallet. Then, the lens suction operation is performed. (S-7) In step S-7, the suction operation is tried three times even when the lens suction signal by the robot finger does not turn on, and when the lens suction signal does not turn on, an abnormality,
Alternatively, it is assumed that there is no lens in the pallet and the planned number has ended (step S-8).

In step S-6, if the suction signal by the finger is ON, the robot conveys the suction lens to the lens alignment unit 18 and places it on the suction position of the lens alignment unit (step S-9).

Then, the lens is attracted by the alignment unit (step S-10), the lens is released from the attraction of the finger (step S-11), the finger is lifted (step S-12), and the robot is retracted (step S-13). )
Then, the robot side proceeds to the lens pickup operation.

Next, the operation of the centering machine main body after step S-14 will be described.

The adsorption of the lens placed on the alignment unit 18 is released to prepare for the lens alignment operation (step S-14).

The control means (not shown) of the lens alignment unit 18 conveys the lens to the lens alignment unit in response to signals such as a movement signal to the lens alignment unit 18 and a finger suction release signal due to the transportation operation of the robot. After detection, the motor 18b of the lens alignment unit is rotated. By the rotation of the motor 18b, the belts 18e1 to 18e3 and the indexing claw 18f1
.About.18f3 moves toward the center, and this operation moves the lens to the center position of the suction portion of the unit, and also corrects the attitude of the lens. This operation is 2
This is repeated (step S-15).

After the confirmation of the step S-15, the lens alignment unit is sucked to hold the lens (step S-16).

Next, the automatic hand moving unit is operated (step S-17), and the finger plate 12h of the automatic hand unit 12 turns 90 degrees in the direction of arrow B from the state of FIG. 5 (becomes horizontal). , The lens on the lens alignment unit 18 is prepared for adsorption (step S-18).

Then, the automatic hand moving unit 14 moves to above the lens positioning unit 18 and further descends (step S-19).

When the finger plate 12h moves onto the alignment unit 18, the finger plate 12h
The suction of the supply finger of h is started, and at the same time, the suction of the lens alignment unit 18 is released, and the lens is transferred (step S-20).

When the lens transfer in step S-20 is completed, the automatic hand moving unit moves to the upper end position of the fixed lens holder unit 2 (step S).
-21).

At this position, the finger plate 12h sets the turning angle to 0 degree (state of FIG. 5) in preparation for lens transfer to the lens holder unit 2 (step S-
22).

After step S-22, the preparatory operation of the centering machine body is confirmed (step S-23).

After the confirmation, the discharge side finger of the finger plate 12h is lowered by the Y-axis motor 12d of the auto hand unit 12 to a position facing the fixed lens holder 2g (step S-24).

Here, the fixed lens holder unit 2
The suction operation is confirmed. When it is ON, it is assumed that the fixed lens holder 2g holds the processed lens by suction, and in order to perform the discharging operation of the processed lens, proceed to the next step S-26. When the process proceeds to OFF, it is determined that the processed lens is not held in the fixed lens holder 2g, and the process proceeds to step S-29 (step S-25).

If it is ON in step S-25, the ejecting finger of the finger plate 12h moves to the delivery position of the fixed lens holder (step S-2).
6).

When it is detected by the signal of the Z-axis encoder of the automatic hand moving unit that the discharge finger has moved to the delivery position, the suction operation of the discharge finger is started, and at the same time, the suction of the fixed side lens holder 2g is released, The lens is delivered to the ejection finger (step S-27).

Then, the automatic hand unit retracts (step S-28).

Furthermore, by the automatic hand moving unit,
The finger plate 12h moves to move the unprocessed lens held by the supply finger 12i to the delivery position of the fixed lens holder 2g (step S-29).

After detecting that the supply finger 12i has moved to the transfer position by the signal of the auto-hand X-axis encoder 14d, the suction means of the fixed lens holder 2g is actuated to hold the unprocessed finger held by the supply finger 12i. After passing the lens, the suction operation of the supply finger 12i is released, and the finger plate 12h is moved to the retracted position (step S-30).

After the step S-30, it is confirmed that the robot is in a predetermined standby position (step S-31).

Next, centering processing of the unprocessed lens is performed in accordance with the lens processing program M1. Processing information for each lens to be processed is input to the storage ROM of the processing control computer 22A. .

The information is, for example, the lens shape (concavo-convex,
(Meniscus, biconvex, biconcave, etc.) Depending on the centering amount, lens material, grindstone performance, etc., the rotation speed of the spindle rotation motor M-1, the rotation speed of the coarse movement motor M-2, the fine movement and the pressure cylinder. The amount of movement of S-1, Z of the first and second centering units
It is the detection position of the axis and the X-axis encoder.

After the confirmation in step S-31, an instruction to apply oil to the lens (step S-32), a grindstone feed setting (step S-33), a lens holder correction processing unit position confirmation (step S-34), Confirmation of presence / absence of wall thickness control (step S-35) and rotation instruction of the spindle rotation motor M-1 (step S-36) are performed.

After that, a lens clamp instruction is issued by the fixed side and movable side lens holders, and the coarse movement motor M-
The movement of the movable lens holder unit in the Z-axis direction by 2 and the clamping of the unprocessed lens adsorbed and held by the fixed lens holder by the fine movement and pressure cylinder S-1 are completed.

Then, the clamp signal is confirmed by the piston position signal of the cylinder S-1 (step S-37).

Further, by confirming the clamp signal, an instruction to release the lens suction of the fixed side lens holder 2g is issued, and it is confirmed that the vacuum switch is off (step S-38).

In step S-38, the preparation for the lens centering work is completed, and an instruction to eject cutting oil is issued (step S-39).

By the rotation of the spindle motor M-1 and the injection of cutting oil, the clamped lens is sandwiched between the fixed side and movable side lens holders for centering (step S-40).

The completion of centering is confirmed by rotating the spindle motor for a predetermined time (S-41).

Here, the cutting oil is jetted in step S-40 by the oil jet pipe 502 provided in the fixed lens holder unit 2 and the oil provided in the movable lens holder unit 4 as shown in FIG. Injection pipe 50
It is performed by 4. The injection of the cutting oil in step S-40 is not intended to lubricate the centering grindstone and the lens, but improves the sliding property between the so-called bell clamp type fixed side and movable side lens holders and the lens, It is performed for the purpose of smooth and accurate centering of the lens by the bell clamp.

Next, the thickness of the clamped lens is measured before the centering process.

This thickness measurement is based on the thickness of the lens.
X-axis of the first and second grindstones 8A, 10A to be centered,
It is necessary to correct the feed amount in the Z-axis direction, which is for this correction work.

Here, it is necessary to change the processing shape of the lens outer peripheral portion depending on the thickness of the lens as shown in FIG.
This will be described with reference to FIG.

As shown in FIG. 11, when an optical system is constructed by incorporating a plurality of lenses in one lens barrel, in order to accurately bring out the design performance of the optical system, the air gap of each lens should be adjusted. It is necessary to incorporate a lens so that d1 (distance between points B and C) and d2 (distance between points D and E) can be accurately obtained. Each lens has an abutting surface 601a, 602a, 602b, 603a, 60 for determining the lens interval.
3b is formed, and this abutting surface is processed at the same time when the lens is centered. For example, lens 6
Regarding 02, in order to accurately obtain the air space between the adjacent left lens 601, the center point C of the lens surface is used.
It is necessary to perform centering processing so that the distance between the abutting surface and the contact surface, that is, the distance between the C point and the G point is accurately obtained. Similarly, in order to accurately set the air distance between the right lens 603 and the adjacent right lens 603, it is necessary to perform centering processing so that the distance between the D point and the H point is accurately set. Considering such a problem, for example, if the distance between the abutting surface 602a and the abutting surface 602b (the distance between the G point and the H point) is always made constant during the centering process, the wall thickness d3 of the lens 602 is reduced. When f changes, the distance between points C and G and the distance between points D and H will also change. Therefore, in the present embodiment, even if the thickness of the lens varies, the distance between the points C and G and the distance between the points D and H, which determine the air distance of the lens, and the distance between the points D and H are always constant. The thickness information is used to correct the lens centering position. As a result, it becomes possible to manufacture a lens capable of accurately defining the air gap of the lens.

The wall thickness of the lens is measured by the fine movement cylinder S-
1 forward movement, sensor operation instruction, and measurement value are input from the detection means to the data processing computer, correction value calculation is performed, and the correction value is transferred from the data processing computer to the processing computer to perform the first and second centering. Unit (NC1, N
C2) Input the correction information of 8 and 10 (step S-4)
2).

When the thickness measurement in step S-42 is completed, the pressure of the lens clamp is instructed to be high (step S).
-43).

Next, the Z-axis motors of the centering units NC1 and NC2 respectively move in the Z-axis direction by taking into account the correction values obtained by the wall thickness measurement, and the X-axis motor feeds the X-axis direction. The movement of each grindstone 8A, 10A to the processing position shown in FIG. 10 is completed (step S-44).

That is, A at the origin position of the first centering grindstone 8A
→ B → C → D, and the origin position of the second centering grindstone 10A → → → is performed.

Description of Grinding Stone FIG. 21 is a sectional view of the essential parts of the first embodiment of the grinding stone according to the present invention, and FIG.
The partial enlarged view of the A section of is shown.

The grindstones 8A and 10A are disk-shaped, a through hole 8a for holding the rotary shaft is provided in the central portion, a processing portion 8b for processing the lens outer diameter portion is formed on the outer peripheral portion of the disk, and a side surface portion 8c of the disk
A chamfered portion 8d is formed by forming an inclined portion between the lens and the lens outer peripheral portion 8b.

The processing portions 8b and 8d are formed by finishing the surface of the disk-shaped substrate member to a predetermined surface roughness and then electrodepositing and fixing the diamond abrasive grains 8f through a binder 8e such as a nickel layer. Perform (FIG. 22).

In this embodiment, an inclined portion is provided between the lens outer peripheral processing portion 8b and the lens main chamfering processing portion 8d, and diamond abrasive grains are formed here as well to form an outer peripheral portion of the lens. Minute chamfering part 8g between chamfered part
Has been formed.

23 and 24 show a second embodiment of a grindstone according to the present invention, and the outer peripheral portion of the grindstone may be dented as described above.

The description will be returned to the flow chart, and each grindstone 8
After the completion of the movement of A and 10A,
A predetermined number of rotations is performed by h and 10h. Then, from each of the processing positions D and shown in FIG.
The respective grindstones are moved to the positions E and E, and are fed to the set value of the outer diameter dimension of the lens where the grindstones are clamped, and the outer diameter is cut (step S-45).

When the feed in the X-axis direction at step S-45 reaches the set value, the feed is stopped, and at that position,
Rotate each whetstone twice. This is called zero cut (step S-46).

Next, the respective grindstones 8A and 10A are moved along the X-axis and the Z-axis.
Axial movement is performed along the movement lines shown in FIG. 10 to move from the outer diameter machining position E to D, to F, and to, respectively (step S-47).

The movement of each grindstone to the main chamfering position is confirmed by the signal of the encoder of each centering unit (step S-48).

After the confirmation, the Z-axis and X-axis motors of the centering unit are driven based on information from the machining control computer to chamfer the main chamfered surface (step S-49).

Subsequently, 2-rotation zero-cut processing is performed at the feeding position (step S-50).

Next, a minute chamfering process, which is a feature of this process, is performed.

This micro chamfering process has been particularly studied for an automated system such as the present system in which a lens is transported by a stocker, a robot pickup finger is automatically sucked, and a robot is automatically discharged to a cleaning basket pallet. Is.

That is, the unprocessed lenses are placed in a plane on the pallet of the stocker, but the processed lenses are placed vertically in the washing basket pallet by the robot.
At that time, the outer diameter portion of the lens may be damaged.

As a result of various studies, it was found that this damage can be avoided by providing a minute chamfered surface between the lens outer diameter surface and the main chamfered surface.

After step S-50, each grindstone 8A, 1
0A is a movement line F → H → I and →→ shown in FIG.
Then, it is fed in the X-axis and Z-axis directions and moved to the minute chamfering position. (S-51) After moving each grindstone to the minute chamfering position, minute chamfering is performed by rotating the grindstone. (S-52) Further, zero cut processing is performed at that position of the grindstone.
(S-53) FIG. 25 is a diagram showing the shape of the outer peripheral portion of a lens that has been minutely chamfered, and has a width of 0.
A minute chamfer of 1 to 0.2 mm is applied.

After completion of the centering processing in steps S-45 to S-53, the first and second centering grindstones are returned to the standby positions at their respective origins (step S-54).

Then, the stop of the cutting oil and the stop of the rotation of the spindle are respectively instructed (step S-55).

In order to prepare for taking out the lens, the suction of the fixed side lens holder is instructed, and the vacuum switch is confirmed (step S-56).

To release the clamp of the movable lens holder, the coarse movement motor M-2 is rotated to disengage the coarse movement slider 4d. Then, the unclamping is confirmed by the encoder 4c (step S-57).

When the steps S-45 to S-57 are completed, the work for centering one unprocessed lens is completed.

Next, a correction processing program for the fixed and movable lens holders will be described.

When the centering process of the clamped lens is completed by the completion of the step S-57, the cumulative counter C1 in the data processing computer is completed.
Counts the number of processed lenses (step S-5
8).

The count value of this processing is counted by the correction counter C2 of the lens holder in the data processing computer (step S-59).

It is confirmed that the first and second centering grindstones (NC1, NC2) are waiting at the origin position for the correction processing of the lens holder (step S-60).

Counter C2 for correcting the lens holder
It is confirmed whether or not has reached the set value (step S-61).

If NO, the program returns to step S-23.

If YES, the operator is notified (step S-62).

If YES in step S-62, the lens holder correction machining program is called from the machining control computer 22B (step S-6).
3).

Step S- of the flowchart program
The preparatory operation from 64 to S-72 is performed.

As described above, the lens holder correction processing means in this apparatus is arranged on the X-axis slider 10g of the second centering grindstone unit 10 as shown in FIG. Therefore, the information on the movement to the preparation position in step S-72 is input to each means of the second centering grindstone unit.

Then, the rotational speed of the spindle motor, the X-axis and Z-axis feed amounts of the second grindstone unit NC2, and the feed speed are commanded, and the inside of the fixed-side lens holder is set by the fixed-side lens holder bite 16b. From the shape of FIG. 26 to FIG.
The cutting process is performed from the a line position to the b line position shown in (step S-73).

After processing the inside of the lens holder, the cutting tool 16b is moved to the preparation position for the outside processing of the lens holder (step S-74).

Rotational speed of the spindle motor M-1 for machining the outside of the lens holder, X axis of the second grindstone unit NC2, Z
The shaft feed and feed speed are commanded to perform the cutting process (c line in FIG. 28) on the outside of the fixed side lens holder (step S-75).

Next, the lens holder is moved to a preparation position for processing the final finished surface (step S-76).

Final finishing surface processing (d line surface) shown in FIG.
And the number of rotations of the second grindstone, the feed amount of the X-axis and the Z-axis of the second grindstone, and the feed speed are commanded (step S-77).

The correction processing unit is returned to the preparation position and the correction value is fed back to the lens cutting program (step S-78).

The cylinder 16e is operated to raise the bite holding plate 16a, and the rise is confirmed by detecting the piston position signal (step S-79).

An instruction to cut off the injection of cutting oil is given (step S-80).

The origin position of the correction processing unit is moved, and the operator is notified of the completion of the correction processing of the fixed lens holder (step S-81).

Next, similarly to the fixed lens holder, the correction processing program for the movable lens holder is executed based on steps S-82 to S-101.

Upon completion of the correction processing of the movable side lens holder based on the above steps, the program returns to the step S-3 by confirming the return of the origin position of the correction processing unit in the step S-98, and the next lens Move to the process for centering.

The present invention can be applied to a modified or modified version of the above embodiment without departing from the spirit of the invention.

[0204]

As described above, according to the present invention, it is possible to obtain a device with high processing efficiency and high processing accuracy by performing the correction processing of the lens holder every time a predetermined number of lenses are processed. .

Further, the processing information of the lens to be processed is stored, and the centering processing of the lens is performed based on this information and the measurement information of the lens held in the lens holder, so that the processing accuracy is higher. Guarantee can be secured.

In addition, a pair of centering units arranged in the vicinity of the centering portion of the lens are used to simultaneously center the plurality of centering portions of the lens to ensure the accuracy of centering on both sides of the lens. You can

Further, by supplying oil between the lens holder and the lens, the lens can be smoothly centered.

Further, by forming the minute chamfered portion at the connecting portion between the lens outer peripheral portion and the main chamfered surface, it is possible to prevent the lens from breaking.

By providing a means for positioning the lens once before supplying the lens to the lens holder, the lens can be positioned at a substantially accurate position with respect to the lens holder, and the lens with respect to the lens holder thereafter. The centering work can be done smoothly.

[0210]

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional technique.

FIG. 2 is an explanatory diagram of a conventional technique.

FIG. 3 is an explanatory diagram of a conventional technique.

FIG. 4 is a perspective view of an embodiment of the centering device of the present invention.

5 is a diagram showing an automatic hand unit of the apparatus shown in FIG.

FIG. 6 is a diagram showing a configuration of a suction finger.

FIG. 7 is a diagram showing a lens holder correction unit.

FIG. 8 is a diagram showing a stocker.

FIG. 9 is a control block diagram of the main centering device.

FIG. 10 is a diagram showing movement trajectories of two centering grindstones.

FIG. 11 is a diagram showing a state in which a lens is incorporated in a lens barrel.

FIG. 12 is a flowchart showing an operation of the apparatus according to the embodiment.

FIG. 13 is a flowchart showing an operation of the apparatus of one embodiment.

FIG. 14 is a flowchart showing an operation of the apparatus of one embodiment.

FIG. 15 is a flowchart showing an operation of the apparatus according to the embodiment.

FIG. 16 is a flowchart showing an operation of the apparatus according to the embodiment.

FIG. 17 is a flowchart showing an operation of the apparatus according to the embodiment.

FIG. 18 is a flowchart showing an operation of the apparatus according to the embodiment.

FIG. 19 is a flowchart showing the operation of the device of one embodiment.

FIG. 20 is a flowchart showing an operation of the apparatus according to the embodiment.

FIG. 21 is a view showing the shape of the grindstone of the first embodiment.

FIG. 22 is an enlarged view of part A in FIG. 21.

FIG. 23 is a view showing the shape of a grindstone according to the second embodiment.

FIG. 24 is an enlarged view of part A in FIG.

FIG. 25 is a diagram showing shapes of a lens outer peripheral portion and a chamfered portion which are minutely chamfered.

FIG. 26 is a diagram for explaining the procedure of the correction processing of the lens holder.

FIG. 27 is a diagram for explaining the procedure of the correction processing of the lens holder.

FIG. 28 is a diagram for explaining the procedure of the correction processing of the lens holder.

FIG. 29 is a view for explaining the procedure of the correction processing of the lens holder.

[Explanation of symbols]

 1 Device Base 2 Fixed-side Lens Holder Unit 6 Measuring Unit 4 Movable-side Lens Holder Unit 8 1st Centering Unit 10 2nd Centering Unit 12 Auto Hand Unit 14 Auto Hand Moving Unit 18 Lens Positioning Unit 15, 16 Lens Holder Modification Processing unit 20 Stocker 22A Data processing computer 22B Processing control computer

 ─────────────────────────────────────────────────── --Continued from the front page (31) Priority claim number Japanese Patent Application No. 7-2755 (32) Priority date Hei 7 (1995) January 11 (33) Priority claim country Japan (JP) (31) Priority Claim Number Japanese Patent Application No. 7-2756 (32) Priority Date No. 7 (1995) January 11 (33) Country of priority claim Japan (JP) (31) No. of priority claim Japanese Patent Application No. 7-2757 (32) Priority Hihei 7 (1995) January 11 (33) Priority claiming country Japan (JP) (31) Priority claim number Japanese Patent Application No. 7-3299 (32) Priority Day Hei 7 (1995) January 12 (33) ) Priority claiming country Japan (JP) (31) Priority claiming number Japanese Patent Application No. 7-11712 (32) Priority date Hei 7 (1995) January 27 (33) Priority claiming country Japan (JP) (72) Inventor Toru Imanari 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Kiyoshi Takahashi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Incorporated (72) Inventor Tomio Nishimura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hisao Furuhara 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. ( 72) Inventor Yoshinori Murasugi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Takayoshi Shimomaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (15)

[Claims] 1. A method for centering the outer circumference of a lens by clamping both sides of a lens with a lens holder, wherein the number of centering processes of the lens is counted, and after a predetermined number of centering times has elapsed, the lens core is processed. A lens centering method, characterized in that a correction tool is subjected to correction processing, and after the correction processing, the lens is centered again. 2. An apparatus for clamping both sides of a lens with a lens holder to center the outer circumference of the lens, wherein the lens is held by a fixed lens holder unit and a movable lens holder unit, and a holding shaft of the lens holder. Means for arranging first and second centering grindstone units on both sides with the lens sandwiching therebetween, lens holder correction processing means arranged in the vicinity of the centering unit, and means for counting the number of centering processing by the centering grindstone And a control means for operating the lens holder correction processing means based on a signal from the counting means. 3. A lens processing method in which both sides of a lens are held by a lens holder and the processing information is processed by controlling processing information by a control means, wherein the lens holding portion of the lens holder is subjected to correction processing. A lens processing method, characterized by inputting information to the control means to correct the information. 4. An apparatus for clamping and holding both sides of a lens by a lens holder and centering the outer circumference of the lens, wherein the lens is held by a fixed lens holder unit and a movable lens holder unit, and a holding shaft of the lens holder. The first and second centering grindstone units are arranged on both sides of the holding shaft, and the first and second centering grindstone units are controlled to move in a direction parallel to and perpendicular to the holding shaft. When performing the centering operation of the lens by maintaining the holding state of the lens in one of the lens holder, at least one surface of the lens when in the holding state, or apply oil to both sides, then, A method of clamping a lens in a lens centering device, characterized in that the other lens holder is moved to sandwich the lens. 5. An apparatus for clamping both sides of a lens by a lens holder and centering the outer circumference of the lens, wherein the lens is held by a fixed lens holder unit and a movable lens holder unit, and a holding shaft of the lens holder. First and second centering grindstone units are disposed on both sides of the oil holder, and the oil applying means is operated by a signal from a signal generating means for confirming the lens suction operation of the lens holder. Clamping device for the lens centering device. 6. A centering grindstone for centering an outer circumference of a lens, comprising a lens outer diameter processing portion on an outer peripheral surface of a substantially disk-shaped main body centered on a processing point axis of the whetstone. A grindstone for centering a lens, comprising first and second lens chamfered portions connecting both side surfaces of the disk-shaped body and the lens outer diameter processed portion in a direction toward the rotation axis. 7. The grinding stone for centering a lens according to claim 6, wherein a minute chamfered portion is provided between the lens outer diameter processed portion and the lens chamfered portion. 8. A set of centering grindstones sandwiching a lens holder for clamping and holding a lens, the centering grindstones being operated so as to center the surfaces of the lenses facing each other. A characteristic lens centering method. 9. A movement locus of the centering grindstone is such that the minute chamfered surface is machined from the outer peripheral portion of the lens toward the main chamfered surface of the lens. The method for centering the lens described in. 10. A lens to be processed is sandwiched by holding means, first and second centering tools are arranged at positions orthogonal to the optical axis of the lens, and the first and second tools are attached. A lens that is rotated and simultaneously processed the outer peripheral surface of the lens to be processed. 11. A lens comprising a minute chamfered surface between an outer peripheral portion of the lens and a main chamfered surface of the lens. 12. Storage means for storing a plurality of lenses to be processed, a plurality of centering means for centering the lenses, and holding the lenses at a position for centering. Holding means for supplying the processed lens to the holding means, positioning means for performing positioning when supplying the processed lens to the holding means, and holding the processed lens from the positioning means. And a transfer means for transferring the lens to the means. 13. An apparatus for clamping both sides of a lens by a lens holder and centering the outer circumference of the lens, wherein the lens is held by a fixed lens holder unit and a movable lens holder unit, and a holding shaft of the lens holder. First and second centering grindstone units are disposed on both sides of the holding shaft, and the first and second centering grindstone units are controlled to move in a direction parallel to the holding shaft and in a vertical direction. And a transfer means for picking up the lens to be processed from the holding position of the unprocessed lens and for supplying and transferring the unprocessed lens to the lens holder with a change in the supply attitude to the lens holder. A centering device for the lens. 14. The transfer means comprises receiving and supplying means for receiving the processed lens held by the lens holder and supplying the next unprocessed lens to the lens holder. Lens centering device described. 15. Clamping means for clamping a lens for centering processing, a pair of centering means for processing a centering portion of the clamped lens, and carrying-in / carrying-out means for carrying in and carrying out a lens to be processed by the clamping means. A first control means for controlling the centering means by inputting information on a processing process of the lens to be processed, and a control for controlling the clamping means and the carry-in / carry-out means in cooperation with the first control means. A lens centering system comprising: a second control means.