JP2010137352A - Method and device for centering - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly accurately and efficiently perform centering by high accurate centering in a short time without generating displacement or the like in fixing a workpiece. <P>SOLUTION: After a lens 5 to be processed is temporarily fixed to a lens fixture 4 of a lens holding shaft 1 by vacuum suction, and centering for matching the axis center of the lens holding shaft 1 with the central axis of the lens 5 to be processed is performed by observing an outgoing light 18a and a reflected light 18b with respect to the lens 5 to be processed with an eccentricity detection device L1 mounted on a moving table 9, the lens 5 to be processed is held and rotated by holding between the lens holding shaft 1 and a lens fixing shaft 6, and centering is performed by pressing a grinding wheel 21 on an outer peripheral part of the lens 5 to be processed. Highly accurate centering can be performed by accurately fixing the lens 5 to be processed with respect to the lens holding shaft 1 in a coaxial state in a short time period without generating displacement compared to the case when the lens 5 to be processed is fixed to the lens fixture 4 by a tar as in the conventional way. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a centering method and a centering apparatus.

  For example, when an optical system is configured using a lens, assembly is performed by fixing the outer periphery of the lens to a member such as a lens barrel. For this reason, if the optical axis of the lens and the center of the outer peripheral portion do not exactly match, accurate assembly of the optical system becomes difficult.

For this reason, in the lens manufacturing field, a centering step of grinding the outer periphery of the lens so that the center of the outer periphery accurately matches the optical axis of the lens is performed.
Centering machines used in the centering process in lens processing are roughly classified according to the centering method performed prior to centering processing, and are divided into an optical centering method and a bell clamp method.

  In the optical centering method, the inspection light irradiated from one side of the lens is transmitted or reflected to form an image on the lens, and this image is observed at the eyepiece to detect the eccentric state of the lens and detect the center. It is a thing to do.

  On the other hand, in the bell clamp method, a lens is sandwiched between two spindles arranged so as to face each other on the same axis, and both the spindles are pressed against each other to autonomously slide the lens to a predetermined stable position. It is a thing to do centering.

  When centering with high accuracy and obtaining a high-quality centering lens, a centering machine using an optical centering system is often used, but this system uses a centering machine and a centering grinder. Need two machines.

Therefore, Patent Document 1 discloses an apparatus that can perform centering and centering with a single machine even in the optical centering system.
5 to 7 show the apparatus described in Patent Document 1 described above.

  First, as shown in FIG. 5, the centering lens 52 is vacuum-adsorbed to the tip of the lens holder 51, and then the light beam emitted from the light source 31 is condensed on the chart 32, and the lens 33 and the lens 34 are passed through the lens. Reflected at 52 surface.

The reflected light beam from the lens 52 is reflected at a right angle by a half mirror 35 provided between the lenses 33 and 34, and an image formed by the lens 36 is observed by the eyepiece 37.
Then, when the image is observed while rotating the lens holder 51, if the rotation center of the lens 52 and the optical axis do not match, the image rotates around the rotation center and draws a circle. Centering is performed by adjusting the position of the lens 52 so as to coincide with the optical axis.

  Next, as shown in FIG. 6, the heating device 41 and the yarn holder 42 approach the lens holder 51 to heat the lens holder 51, and the yarn 43 contacts the lens holder 51 and the lens 52 from the yarn holder 42. Supplied to the department.

Thereafter, the heating device 41 and the spear holder 42 are retracted, and the lens 52 is fixed to the lens holder 51 by melting and solidifying the supplied spur 43.
After that, as shown in FIG. 7, the high-speed rotating grindstone 54 provided in the same machine moves back and forth in the axial direction of the lens holder 51 and moves to the peripheral surface side of the lens, thereby contacting the peripheral surface. The outer diameter of the lens 52 is ground.

  On the other hand, in the bell clamp method, a lens is sandwiched between a pair of lens holders mounted at the tips of two spindles arranged opposite to each other on the same axis, and both the spindles are pressed against each other, thereby predetermining the lens. The centering is performed by sliding autonomously to the position.

  In the centering of the bell clamp system, a centering coefficient or a Z value (hereinafter referred to as “Z value”) is used as an index for determining whether centering is possible. The Z value is generally expressed by the following equation (1).

Z = | (r1 / R1 ± r2 / R2) / 2 | (1)
In this formula (1), R1 and R2 mean the radii of curvature on each surface of the lens, and r1 and r2 mean the radii of the pair of lens holders. As for the sign (±) of the expression (1), a + sign is used when the lens is a biconvex lens or a biconcave lens, and a − sign is used when the lens is a meniscus lens.

  If the Z value is 0.1 or more in the equation (1), it is generally said that the lens can be centered and centered. For this reason, in order to perform centering using bell clamp type centering, a lens with a small curvature radius (R1, R2) is targeted, or the radius (r1, r2) of the lens holder is set as large as possible. It is necessary to increase the contact angle between the lens holder and the lens to increase the force to overcome the frictional force.

However, such conventional techniques have the following technical problems.
That is, in the optical centering method, since the lens is fixed to the lens holder with the lens after centering the lens, there is a technical problem that the lens is misaligned due to thermal deformation of the lens during bonding.

In addition, since the lens holder needs to be heated and cooled in order to fix the lens to the lens holder, there is a technical problem that the working time is generally long.
On the other hand, in the case of the bell clamp method, in the case of a lens with a low Z value, the contact angle between the lens holder and the lens is small, so the centering cannot be performed with high accuracy, and the shape of the lens that can be centered, that is, centered, is limited. There is a technical problem of being done.
Japanese Utility Model Publication No.59-167647

  An object of the present invention is to provide a technique capable of performing high-precision and efficient centering processing with high-precision centering in a short time without causing a positional shift or the like when the workpiece is fixed. It is in.

A first aspect of the present invention is a step of temporarily fixing a workpiece to be freely movable with respect to a first holding means that is rotatable around an axis;
Detecting and correcting eccentricity between a central axis of the workpiece temporarily fixed to the first holding means and the axis of the first holding means;
Sandwiching the workpiece between the first holding means and the second holding means facing the first holding means;
Performing centering while rotating the workpiece sandwiched by the first holding means and the second holding means;
A centering method including the above is provided.

According to a second aspect of the present invention, there is provided a first holding means that is rotatably provided about an axis and holds a workpiece in a freely movable manner.
An eccentricity that is provided so as to be movable relative to the first holding means and detects an eccentricity between a central axis of the workpiece held by the first holding means and the axis of the first holding means. A detection device;
Second holding means for rotating while sandwiching the workpiece with the first holding means;
Grinding means for grinding the outer periphery of the workpiece;
A centering apparatus including the above is provided.

  According to the present invention, there is provided a technique capable of performing centering processing with high accuracy and efficiency by high-precision centering in a short time without causing a positional deviation or the like when the workpiece is fixed. Can do.

  In the first aspect of the present embodiment, the first holding means that is rotatable about an axis and the movable table that is movable relative to the first holding means are mounted on the first holding means. The workpiece is sandwiched and rotated between the first holding means and an eccentricity detecting device for detecting the eccentricity between the center axis of the workpiece held by the means and the axis of the first holding means. Disclosed is a centering apparatus including second holding means for performing grinding and grinding means for grinding an outer peripheral portion of the workpiece.

  In the second aspect of the present embodiment, the eccentricity between the first holding means and the workpiece is measured on a moving table that can move relative to the first holding means that can rotate about the axis. Preparing a centering device having a configuration in which an eccentricity detecting device and a second holding unit that holds and rotates the workpiece between the first holding unit and the first holding unit are mounted; and Detecting the eccentricity of the workpiece temporarily fixed to the workpiece by the eccentricity detecting device and correcting the eccentricity between the second holding means and the first holding means. There is provided a centering method including a step of sandwiching a workpiece and a step of centering while rotating the workpiece by the first holding means and the second holding means.

  According to each aspect of the present embodiment described above, after the amount of eccentricity of the lens as the work piece sucked and fixed to the lens yatoy as the first holding means is detected and adjusted by the eccentricity detecting device, the second holding means By holding with a lens fixing yato as described above, it becomes possible to hold a lens centered with high accuracy regardless of the Z value between the lens yatoi and the lens fixing yatoy without causing any misalignment.

  In addition, according to each aspect of the present embodiment, after the amount of eccentricity of the lens sucked and fixed to the lens unit is detected by the eccentricity detecting device and the centering is adjusted, the lens held by the lens fixing unit is centered. Therefore, it is possible to center the lens with any shape regardless of the Z value with high accuracy.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[Embodiment 1]
1 and 2 are plan views showing an example of the configuration and operation of a centering apparatus that performs the centering method according to one embodiment of the present invention.

1 shows the alignment state, and FIG. 2 shows the state during grinding.
[Constitution]
The centering device M1 according to the first embodiment has a lens holding shaft 1 (first holding means), a lens fixing shaft 6 (second holding means), and an eccentricity detecting device L1 mounted on a moving table 9. .

  In the centering device M1 according to the first embodiment, the lens fixing shaft 6 is disposed coaxially facing the axis 1a of the lens holding shaft 1, and is in the X direction (the left-right direction in FIG. 1) that is the facing direction. It is configured to be movable.

Further, the moving table 9 on which the eccentricity detecting device L1 is mounted can be moved and positioned in the X direction described above and in the Y direction (vertical direction in FIG. 1) orthogonal to the X direction.
Then, the lens 5 (workpiece) to be centered is hinged coaxially (ie, interchangeably screwed) to the tip of the lens holding shaft 1 that can rotate around the axis 1a. The lens device 4 (first holding means) can be sucked and held by the suction device 3. The front end portion of the lens yatoy 4 has a cup shape, and one surface (a convex surface in the present embodiment) of the lens 5 to be processed comes into contact therewith.

  In this case, the suction force of the processed lens 5 to the lens lens 4 by the suction device 3 is such that the processed lens 5 does not fall off the lens lens 4 due to its own weight, and the processed lens 5 has an optical axis 5 a (center) relative to the lens lens 4. It is adjusted so that it can be moved by an external force in a direction crossing the axis.

In the vicinity of the lens holding shaft 1 on the side opposite to the eccentricity detection device L1, a grinding wheel 21 (grinding means) that is fixed to the grinding drive shaft 20 of the grinding motor 19 and rotates is provided.
The grinding motor 19 is placed on a movable table (not shown), and the grinding wheel 21 can be brought close to the outer periphery of the lens 5 to be processed held on the lens holding shaft 1.

  A holding shaft transmission gear 2 is connected to the rear end portion of the lens holding shaft 1, and the holding shaft transmission gear 2 meshes with a holding shaft driving gear attached to a transmission shaft coupled to a lens shaft driving motor (not shown). The rotation of the lens shaft drive motor is transmitted to rotate.

  The lens fixing shaft 6 is rotatable and parallel to the axis 1a of the lens holding shaft 1 and at the same height (the same position in the direction perpendicular to the paper surface of FIG. 1 (Z direction orthogonal to the X direction and the Y direction)). It is installed coaxially and slidable in the X direction.

  A lens fixing shaft 8 (second holding means) is hinged to the front end portion of the lens fixing shaft 6, and a fixed shaft transmission gear 7 is connected to the rear end portion. The front end portion of the lens fixing goat 8 has a cup shape, and a surface (a convex surface in the present embodiment) on the opposite side to the surface of the lens 5 to be processed with which the lens goat 4 abuts. .

The fixed shaft transmission gear 7 meshes with a fixed shaft drive gear attached to the transmission shaft (not shown), and the rotation of the lens shaft drive motor is transmitted to rotate.
The fixed shaft transmission gear 7 and the fixed shaft driving gear (not shown) have the same number of teeth as the holding shaft transmission gear 2 and the holding shaft driving gear attached to the rear end of the lens holding shaft 1. The fixed shaft 6 can rotate synchronously.

  Further, the lens lens 4 and the lens fixing shaft 8 are hinged to the lens holding shaft 1 and the lens fixing shaft 6, respectively, and then the rotation center axis of the lens holding shaft 1 (lens fixing shaft 6) and the lens lens shaft 4 (lens fixing shaft). In 8), there is no eccentricity with the outer peripheral part of the tip part, and the surface is smoothed using a lathe so that the surface of the lens 5 to be processed is smooth so as not to be scratched.

An eccentricity detection device L1 provided on the moving table 9 includes a light source 18, a collimating lens 17, an beam splitter 16, a condensing lens 12, a condensing lens 13, a mirror 10 and a mirror 11 as an observation optical system, and imaging. A CCD camera 14 as a unit and a monitor 15 are provided.

  The optical axis of the light source 18, the collimating lens 17, the beam splitter 16, the condenser lens 12, the mirror 10, and the mirror 11 in this eccentricity detection device L1, that is, the optical path of the outgoing light 18a incident on the lens 5 to be processed is a lens holding axis. It is adjusted so as to be parallel to and at the same height as one axis (axial center 1a).

  That is, the optical path of the outgoing light 18a incident on the lens 5 to be processed from the mirror 10 of the eccentricity detection device L1 is moved in the X direction within the XY plane including the axis 1a of the lens holding shaft 1 by the movement of the moving table 9. Move parallel to

  In this eccentricity detection device L1, the emitted light 18a from the light source 18 passes through the collimating lens 17, the beam splitter 16 and the condenser lens 12, the mirror 11, and the mirror 10 installed between the lens 5 to be processed and the light source 18. The light enters the lens 5 to be processed from the X direction.

  The reflected light 18 b reflected by the workpiece lens 5 is incident on the CCD camera 14 via the mirror 10, the mirror 11, the condenser lens 12, the beam splitter 16, and the condenser lens 13, and is obtained by the CCD camera 14. The observed image can be observed on the monitor 15.

In this centering device M1, when the lens yatoe 4 is rotated and observed on the monitor 15, if the optical axis 5a of the lens 5 to be processed does not coincide with the rotation center (axial center 1a) of the lens holding shaft 1, the monitor 15 Since the image displayed on the lens rotates around the axis 1a of the lens holding shaft 1 and draws a circle, the position of the lens 5 to be processed is adjusted in the Y direction so that the image displayed on the monitor 15 stops. Is centered.
[Action]
Hereinafter, the operation of the centering device M1 of the first embodiment will be described.

In the centering device M1 according to the first embodiment, first, the lens 5 to be centered is sucked by the suction device 3 at the tip of the lens yatoy 4 and temporarily held.
Next, the moving table 9 is moved in the parallel direction (X direction) and the vertical direction (Y direction) with respect to the axial direction of the lens holding shaft 1 so that the eccentricity detecting device L1 can measure the eccentricity of the lens 5 to be processed. (In this case, the optical path of the outgoing light 18a emitted from the mirror 10 moves to the position where it matches the axis 1a of the lens holding shaft 1).

This state is shown in FIG.
Next, while observing the eccentricity of the processed lens 5 temporarily fixed to the lens holding shaft 1 by the monitor 15 of the eccentricity detecting device L1, the processed lens 5 is appropriately moved in the direction intersecting the X direction with respect to the lens yatoy 4. Centering is performed so that the optical axis 5a of the lens 5 to be processed is aligned with the axis 1a of the lens holding shaft 1.

After completion of the centering, the moving table 9 is moved, and the eccentricity detecting device L1 is retracted to a position where the movement of the lens fixing shaft 6 is not hindered.
Next, the lens fixing shaft 6 is moved forward in the X direction toward the lens 5 to be processed, the lens 5 is clamped by the lens fixing shaft 8 and the lens fixing shaft 6 is moved until a desired clamping pressure is reached.

This state is shown in FIG.
After that, the lens holding shaft 1 and the lens fixing shaft 6 are rotated synchronously, and the grinding wheel 21 that rotates at high speed is applied to the outer peripheral portion of the processing lens 5 while rotating the processing lens 5. Grinding, that is, centering.
[effect]
In such a centering device M1 of the first embodiment, when the lens 5 to be processed is centered, an optical type using the eccentricity detection device L1 in a state of being temporarily fixed to the lens holding shaft 1 by the suction device 3. Since centering is performed, centering can be performed with high accuracy in a short period of time without going through a heating / cooling process for fixing the lens with spear or the like, regardless of the Z value of the lens 5 to be processed.

  Furthermore, the lens 5 to be processed centered in a state of being coaxially disposed on the lens holding shaft 1 by using the lens fixing shaft 8 mounted on the lens fixing shaft 6 is clamped. The processing lens 5 is accurately arranged and fixed on the same axis as the lens holding shaft 1 with high accuracy without causing a misalignment.

Thereby, regardless of the Z value of the lens 5 to be processed, a highly accurate centering lens can be manufactured from the lens 5 to be processed having various shapes.
In the first embodiment, the example in which the eccentricity detection device L1 is movable in the horizontal direction (in the plane parallel to the paper surface of FIG. 1, in the XY plane) with respect to the lens holding shaft 1 is described. Of course, it is possible to adopt a configuration that can move in a direction perpendicular to the lens holding axis (a direction perpendicular to the paper surface) or other directions besides the horizontal direction.
[Embodiment 2]
FIG. 3 and FIG. 4 are plan views showing the configuration and operation of a centering apparatus that performs the centering method according to another embodiment of the present invention.

FIG. 3 shows the alignment state, and FIG. 4 shows the state during grinding.
[Constitution]
In the centering device M2 of the second embodiment illustrated in FIGS. 3 and 4, the same components as those of the centering device M1 of the first embodiment described above are denoted by the same reference numerals and redundant description is omitted. To do.

In the centering device M2 of the second embodiment, the lens fixing portion 23 (second holding means) connected to the tip of the lens fixing shaft 22 (second holding means) arranged opposite to the lens holding shaft 1 is provided. For example, it is different from the first embodiment described above in that it is made of a material made of an elastic member such as a rubber ball or a hollow balloon.
[Action]
In the centering device M2 according to the second embodiment, in the state shown in FIG. 3, after the centering of the lens 5 to be processed with respect to the lens holding shaft 1 is performed using the eccentricity detecting device L1, the moving table 9 is moved, and the lens is moved. The eccentricity detection device L1 is retracted to a position that does not hinder the movement of the fixed shaft 22.

  Thereafter, as illustrated in FIG. 4, the lens fixing shaft 22 is advanced in the X direction with respect to the processing lens 5, and the processing lens 5 is moved between the lens fixing portion 23 and the lens lens 4 of the lens holding shaft 1. Hold it.

  At this time, the lens fixing portion 23 provided at the distal end portion of the lens fixing shaft 22 is deformed following an arbitrary shape of the lens 5 to be processed, generates an appropriate elasticity, and the lens with a desired clamping pressure. The lens 5 to be processed is held between the holding shaft 1.

  Then, the outer periphery of the lens 5 to be processed is ground by the grinding wheel 21 in a state where the lens 5 to be processed is held and rotated between the lens unit 4 of the lens holding shaft 1 and the lens fixing portion 23 of the lens fixing shaft 22. Perform centering.

In the centering device M2 of the second embodiment, the fixed shaft transmission gear 7 of the lens fixed shaft 22 is used.
, The lens fixing shaft 22 is configured to be idled, and the rotational force on the lens holding shaft 1 side is rotated when the lens 5 to be processed is sandwiched and rotated between the lens holding shaft 1 and the lens fixing shaft 22. Thus, the lens fixing shaft 22 can be driven and rotated.

As described above, when the lens fixing shaft 22 is driven to rotate, the configuration of the lens fixing shaft 22 is simplified, and the manufacturing cost of the centering device M2 can be reduced.
[effect]
In the centering device M2 of the second embodiment, the same effect as that of the centering device M1 described above can be obtained, and the processed lens 5 centered with high accuracy by the eccentricity detecting device L1 is made of an elastic member. Since the lens holding portion 23 is sandwiched between the lens holding shaft 1 and the lens fixing shaft 22, even if the coaxiality of the lens holding shaft 1 and the lens fixing shaft 22 is not set with high accuracy, the axial displacement error between the two is made of the elastic member. It can be absorbed by deformation.

  For this reason, the centered lens 5 to be processed is held between the lens holding shaft 1 and the lens fixing shaft 22 without causing a misalignment regardless of the accuracy of the coaxiality between the lens holding shaft 1 and the lens fixing shaft 22. Therefore, centering can be performed.

For this reason, since the centering process can be performed on the lens 5 to be processed centered with high accuracy, a highly accurate centering lens can be manufactured from the lens 5 to be processed.
As described above, according to each embodiment of the present invention described above, the following effects can be obtained. In other words, when centering the lens, optical centering is performed using the eccentricity detection device in a temporarily fixed state, so that the heating / cooling process for fixing the lens with a spear or the like is not performed in a short time. In addition, centering can be performed with high accuracy regardless of the Z value.

  Furthermore, since the lens centered with the lens fixing Yatei mounted on the lens fixing shaft coaxially placed on the lens axis is clamped, the temporarily centered lens does not cause misalignment. It can be arranged coaxially with the holding shaft.

As a result, a highly accurate centering lens can be manufactured regardless of the Z value.
In addition, when the lens centered with high accuracy by the eccentricity detecting device is sandwiched between the lens fixing portions formed of elastic members, even if the coaxiality of the lens holding shaft and the lens fixing shaft is not configured with high accuracy, The axis deviation error can be absorbed by deformation of the elastic member.

For this reason, the centered lens to be processed can be held without causing a misalignment regardless of the accuracy of the coaxiality between the lens holding shaft and the lens fixing shaft.
As a result, since the lens to be processed centered with high accuracy can be centered, a highly accurate centering lens can be manufactured from the lens to be processed.

Further, it is not necessary to create the lens fixing shaft 22 with higher precision than necessary with respect to the lens holding shaft 1, and the manufacturing cost of the centering device M2 can be reduced.
Needless to say, the present invention is not limited to the configuration exemplified in the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, although a lens is exemplified as the workpiece, the present invention can be widely applied to general articles that require high-precision centering.
(Appendix 1)
A first holding means rotatable around an axis, and a center axis of a workpiece placed on a moving table movable relative to the first holding means and held by the first holding means And an eccentricity detecting device for detecting an eccentricity of the first holding means with respect to the shaft center, second holding means for rotating while holding the work piece between the first holding means, and the work piece And a centering device for grinding the outer periphery of the centering device.
(Appendix 2)
The centering apparatus according to appendix 1, wherein the workpiece is a lens, the first holding unit is a lens unit that holds the lens by suction, and the second holding unit rotates together with the lens unit. A centering device comprising a lens fixing unit that clamps the lens with the lens unit.
(Appendix 3)
The centering apparatus according to appendix 1, wherein the workpiece is a lens, the first holding unit is a lens unit that adsorbs and holds the lens as a single unit, and the second holding unit is between the lens unit and the lens unit. A centering apparatus comprising: an elastic member that is driven and rotated while sandwiching the lens.
(Appendix 4)
The centering apparatus according to appendix 1, wherein the eccentricity detecting apparatus includes an observation optical system that configures an optical path of inspection light passing through a surface of the workpiece, and an imaging unit that visualizes the inspection light. A centering machine characterized by
(Appendix 5)
An eccentricity detecting device for measuring the eccentricity between the first holding means and the workpiece is placed on a moving table that can move relative to the first holding means that can rotate about an axis, and the first A step of preparing a centering device having a second holding unit that rotates while sandwiching the workpiece with the holding unit; and the workpiece temporarily fixed to the first holding unit A step of detecting and correcting the eccentricity by the eccentricity detecting device, a step of relatively translating the second holding means, and clamping the workpiece between the first holding means, Centering processing, wherein the centering process is performed while rotating the workpiece by the first holding means and the second holding means.
(Appendix 6)
The centering method according to claim 5, wherein the eccentricity detecting device detects the eccentricity by an optical method.
(Appendix 7)
The centering method according to claim 5, wherein the second holding means is constituted by an elastic member that rotates following the first holding means.

It is a top view which shows an example of a structure and effect | action of the centering apparatus which implements the centering process which is one embodiment of this invention. It is a top view which shows an example of a structure and effect | action of the centering apparatus which implements the centering process which is one embodiment of this invention. It is a top view which shows the structure and effect | action of the centering apparatus which implements the centering process which is other embodiment of this invention. It is a top view which shows the structure and effect | action of the centering apparatus which implements the centering process which is other embodiment of this invention. It is a conceptual diagram which shows the principle of the centering method of a prior art. It is sectional drawing which shows an effect | action of the centering method of a prior art. It is sectional drawing which shows an effect | action of the centering method of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens holding shaft 1a Axis center 2 Holding shaft transmission gear 3 Suction device 4 Lens go toy 5 Processed lens 5a Optical axis 6 Lens fixed shaft 7 Fixed shaft transmission gear 8 Lens fixed Yato 9 Moving table 10 Mirror 11 Mirror 12 Condensing lens 13 Collection Optical lens 14 CCD camera 15 Monitor 16 Beam splitter 17 Collimating lens 18 Light source 18a Emission light 18b Reflected light 19 Grinding motor 20 Grinding drive shaft 21 Grinding wheel 22 Lens fixing shaft 23 Lens fixing portion L1 Eccentricity detection device M1 Centering device M2 Centering apparatus

Claims (7)

Temporarily fixing the work piece so as to be freely movable with respect to a first holding means rotatable around an axis;
Detecting and correcting eccentricity between a central axis of the workpiece temporarily fixed to the first holding means and the axis of the first holding means;
Sandwiching the workpiece between the first holding means and the second holding means facing the first holding means;
Performing centering while rotating the workpiece sandwiched by the first holding means and the second holding means;
A centering method comprising the steps of: The centering method according to claim 1,
A centering processing method, wherein the eccentricity is detected in a non-contact manner with respect to the workpiece by an optical method of observing a light beam passing through the workpiece that is temporarily fixed to the first holding means and rotates. . The centering method according to claim 1,
A centering method according to claim 1, wherein an elastic member driven and rotated with respect to the first holding means is used as the second holding means. A first holding means provided rotatably about an axis and holding the workpiece in a freely movable manner;
An eccentricity that is provided so as to be movable relative to the first holding means and detects an eccentricity between a central axis of the workpiece held by the first holding means and the axis of the first holding means. A detection device;
Second holding means for rotating while sandwiching the workpiece with the first holding means;
Grinding means for grinding the outer periphery of the workpiece;
A centering device characterized by comprising: The centering apparatus according to claim 4, wherein
The workpiece is a lens;
The first holding means includes a lens yato that sucks and holds the lens movably as a single unit,
The centering device according to claim 1, wherein the second holding means includes a lens fixing yatoy that rotates together with the lens yatoy and holds the lens between the lens yatoy. The centering apparatus according to claim 4, wherein
The workpiece is a lens;
The first holding means includes a lens yato that sucks and holds the lens movably as a single unit,
The centering apparatus according to claim 2, wherein the second holding means includes an elastic member that rotates following the lens with the lens yatoy. The centering apparatus according to claim 4, wherein
The eccentricity detection device includes:
An observation optical system constituting an optical path of inspection light passing through the surface of the workpiece;
An imaging unit for visualizing the inspection light;
With
The centering apparatus according to claim 1, further comprising a moving table on which the observation optical system and the imaging unit are mounted and movable relative to the first holding means.