JP2005219183A - Lens centering and edging method and its machining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens centering and edging method which can easily and precisely carry out machining to modify a shape of a machined lens, and also to provide a device for machining the same. <P>SOLUTION: A lens holding shaft 2 and grinding shafts 18, 21 are relatively moved to each other and a lens 1 held in a lens holding shaft 2 is ground with a grinding wheel 17. The shape of the machined lens 1 is measured while the lens is held in the lens holding shaft 2, and by the measured information grinding is carried out to modify the shape of the lens 1 while the lens is held in the lens holding shaft 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lens centering processing method and processing apparatus for processing the outer periphery, end face, and chamfering of a lens to be processed in accordance with the optical center axis of the lens to be processed.

  2. Description of the Related Art Conventionally, a centering device used in a centering step in lens processing, which can perform lens outer periphery processing, end surface processing, and chamfering processing on one device is disclosed in JP 2000-153436 A. It is disclosed in the gazette.

  7 and 8 show the apparatus described in this publication, which includes a moving table 52, a grindstone shaft 60, a second grindstone shaft 75, and an eccentricity detecting device 67, and the lens 64 to be processed is held by the lens. It is held on the shaft 51. The lens holding shaft 51 is rotatably supported on the moving table 52. A pulley 53 is attached to one end of the lens holding shaft 51, and the pulley 53 is connected to the motor 54 installed on the moving table 52 via the pulley 55 and the belt 56, so that the rotation of the motor 54 is controlled by the lens. It is transmitted to the holding shaft 51.

  The moving table 52 includes a guide 57 extending in the axial direction of the lens holding shaft 51, a feed screw 58 provided in parallel with the guide 57, and a first table drive motor 59 connected to the feed screw 58. ing. The moving table 52 can be moved and positioned in a direction parallel to the axis of the grindstone shaft 60 by a first table drive motor 59.

  Further, below the guide 57, a guide rail 61 extending in a direction orthogonal to the guide direction of the guide 57, a feed screw 62 provided in parallel to the guide rail 61, and a second table connected to the feed screw 62 are provided. A drive motor 63 is provided. Therefore, the moving table 52 can be moved and positioned in the direction perpendicular to the axis of the grindstone shaft 60.

  A grindstone 65 for grinding the outer periphery of the lens 64 is attached to the grindstone shaft 60, and the grindstone shaft 60 is rotated at a high speed by a motor (not shown). The guide rail 61 and the like on which the grindstone shaft 60 and the lens holding shaft 51 are placed are arranged on the same surface of the machine base (not shown).

  The second grindstone shaft 75 is provided so as to be orthogonal to the grindstone shaft 60, and is provided at a position between the grindstone shaft 60 and the eccentricity detection device 67. A second grindstone 76 is attached to the second grindstone shaft 75. The second grindstone 76 performs grinding of the end face of the lens 64 and chamfering. For this reason, the second grindstone 76 has a disk shape and has an outer shape in which a tapered portion is formed on the ridgeline. ing. Further, the second grindstone shaft 75 can be rotated at a high speed by a motor (not shown).

  At the tip of the lens holding shaft 51, a lens goat 66 for fixing one end of the lens 64 is attached, and the eccentricity detecting device 67 is installed on an extension of the axis of the lens goat 66. The eccentricity detecting device 67 is also disposed on the same surface of the base.

  The decentration detection device 67 includes a light source 68, a collimating lens 69, a beam splitter 70, condensing lenses 71 and 72, a CCD camera 73, and a monitor 74. In this structure, light emitted from the light source 68 is incident on the lens 64 via the collimating lens 69, the beam splitter 70, and the condenser lens 71 installed between the lens 64 and the light source 68. The reflected light reflected by the lens 64 is incident on the CCD camera 73 via the condenser lens 71, the beam splitter 70 and the condenser lens 72, and the image obtained by the CCD camera 73 is observed on the monitor 74. Can do.

  In this lens centering machine, when the lens Yato 66 is rotated and observed, if the optical axis of the lens 64 is not aligned with the rotation center of the lens holding shaft 51, the image rotates to draw a circle so that the image stops. The centering is performed by adjusting the position of the lens 64 to the rotation center of the lens holding shaft 51.

  In the lens centering device having the above-described configuration, first, the lens 64 to be centered is temporarily held at the tip of the lens yatoy 66 with an adhesive that is softened by heating such as spear. While the adhesive is softened, the eccentricity detecting device 67 performs centering while observing the eccentricity of the lens 64, and after the centering, the adhesive is cooled to fix the lens 64 to the tip of the lens yatoy 66.

  Next, the first and second table drive motors 59 and 63 are driven, the moving table 52 is moved to the grindstone shaft 60 side, and the lens holding shaft 51 is slowly rotated while the grindstone 65 that rotates at high speed is applied. The lens 64 is applied and the outer periphery of the lens 64 is ground.

Thereafter, as shown in FIG. 8, the first table drive motor 59 and the second table drive motor 63 are driven, and the moving table 52 is moved to the position of the second grindstone 76 of the second grindstone shaft 75, While slowly rotating the lens holding shaft 51, the lens 64 is applied to the second grindstone 76 that rotates at high speed, and the lens end face and the chamfer are ground.
JP 2000-153436 A

  However, in the lens centering device described in Japanese Patent Laid-Open No. 2000-153436 described above, when measuring the lens size after processing, it is necessary to remove the lens from the lens yatoy on the device and measure the size. Therefore, after the measurement, if the processed lens does not have a predetermined size, the lens must be centered, positioned, fixed to the lens lens and processed again. It is difficult to avoid an error in the position where the wire is fixed (which is different from the fixed position when it is first machined), and there is a problem that high-precision machining cannot be performed. Moreover, since it is necessary to attach and detach the lens when measuring the dimension of the lens after processing, there is a problem that the possibility that the lens is damaged, damaged, or lost is increased.

  In addition to the centering device, a measuring instrument for measuring the outer diameter and the chamfering size of the lens is necessary, and there is a problem that the installation space must be secured.

  The present invention has been made in view of the problems described above, and can easily and highly accurately correct the outer periphery, end face, and chamfered shape of the processed lens, and improve the yield during processing. An object of the present invention is to provide a lens centering method and a processing apparatus for the same that can perform processing and measurement of a lens in a space-saving manner.

  The invention according to claim 1 is a lens holding portion capable of holding a lens at a tip and rotating the lens around a rotation axis, a grinding portion for rotatably holding a grindstone for processing the lens, and the lens holding portion. And a moving device capable of relatively moving the grinding unit, a shape measuring unit for measuring the shape of the lens processed in a state of being held by the lens holding unit, and measurement information obtained by the shape measuring unit A controller for operating the moving device to adjust a relative positional relationship between the lens holding unit and the grinding unit and to perform a grinding process for correcting the shape of the lens held by the lens holding unit. This is a lens centering device.

  According to a second aspect of the present invention, there is provided a centering step for fixing the lens to the lens holding portion in a state where the optical axis of the lens and the rotation axis of the lens holding portion are aligned, and the lens held by the lens holding portion. A grinding process for grinding the lens by bringing the lens into contact with a grindstone, a shape measuring process for measuring the shape of the lens while being held by the lens holding part, and measurement information obtained by the shape measuring part And a correction grinding process for performing a grinding process for correcting the lens shape held in the lens holding portion.

  According to the present invention, it is possible to measure the lens shape without removing the processed lens from the processing apparatus, and when correcting the processed lens, the lens is fixed as it is at the position where it was first processed. High-precision processing becomes possible. In addition, when measuring the lens shape, it is not necessary to attach or detach the lens, so that the possibility of damaging, damaging, or eliminating the lens is reduced, so that the yield during processing can be improved. Furthermore, it is not necessary to install a dedicated measuring device separate from the processing device, the configuration of the processing device including the measurement unit can be simplified, and the processing device including the measurement unit can be downsized. It becomes possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
A first embodiment of the present invention will be described with reference to FIGS. 1 is a front view of the lens centering device, FIG. 2A is a front view showing a processing state of the outer periphery of the lens, FIG. 2B is a front view showing a processing state of the lens end face, and FIG. FIG. 3 is an explanatory view of a lens shape after processing, showing a state of lens chamfering.

(Constitution)
As shown in FIG. 1, the lens centering device of the present embodiment includes a first moving mechanism 3 having a lens holding shaft (lens holding portion) 2 movably, and a lens holding shaft (lens holding portion) 2 as a first. A second moving mechanism 12, which is movable in a direction different from that of the first moving mechanism 3, a first grindstone shaft (first grinding portion) 18, a second grindstone shaft (second grinding portion) 21, and an eccentricity. A detection device 24 and a stereomicroscope 26 are provided. The eccentricity detection device 24 can be configured in the same manner as the conventional one described above.

  As shown in FIG. 1, a lens holding shaft 2 that holds a lens 1 to be processed is rotatably supported on a moving table 4 of a first moving mechanism 3. A pulley 5 is attached to one end of the lens holding shaft 2. The pulley 5 and a pulley 7 attached to an output shaft of a motor 6 installed on the moving table 4 are connected via a belt 8. Thereby, the rotation of the motor 6 is transmitted to the lens holding shaft 2, and the lens holding shaft 2 rotates.

  As shown in FIG. 1, the first moving mechanism 3 includes a moving table 4, a guide 9 that guides the moving table 4 in the axial direction of the lens holding shaft 2, and a feed provided parallel to the guide direction of the guide 9. A screw 10 and a table drive motor 11 connected to the feed screw 10 are provided. The moving table 4 can be moved and positioned in a direction parallel to the rotation center axis of the first grindstone shaft 18 by the table drive motor 11.

  In addition, a second moving mechanism 12 is provided below the first moving mechanism 3. The second moving mechanism 12 is installed in parallel to the guide 13 extending in the direction orthogonal to the guide 9 of the first moving mechanism 3, the feed screw 14 provided in parallel to the guide 13, and the guide direction of the guide 13. The linear scale 15 that detects the position of the lens holding shaft 2 in the guide direction of the guide 13 and the table drive motor 16 that is connected to the feed screw 14 and drives the feed screw 14 are provided. Therefore, the lens holding shaft 2 that holds the lens 1 to be processed can also be moved and positioned in a direction perpendicular to the rotation center axis of the first grindstone shaft 18.

  The table drive motors 11 and 16 and the linear scale 15 are connected to a control device 30. The control device 30 controls the rotation of the table drive motors 11 and 16 to move and position the lens holding shaft 2. .

  On the other hand, the first grindstone shaft 18 has a rotation center axis arranged on the same plane as the straight line including the rotation center axis of the lens holding shaft 2, and the outer circumference of the lens 1 is on the rotation center axis. A disk-shaped grindstone 17 for grinding is provided coaxially. The first grindstone shaft 18 is configured to be rotated by a grindstone rotating motor 19. Further, the second grindstone shaft 21 has a rotation center axis arranged on the same plane as a straight line including the rotation center axis of the lens holding shaft 2 and the rotation center axis of the first grindstone shaft 18, and A disc-shaped grindstone 20 having a chamfering portion for chamfering and grinding the end surface of the lens 1 is provided on the rotation center axis. The second grindstone shaft 21 is installed with its rotation center axis positioned so as to be orthogonal to the first grindstone shaft 18 and can be rotated by the grindstone rotating motor 22.

  As shown in FIG. 1, the lens holding shaft 2 that fixes one end of the lens 1 is attached to the tip of the lens holding shaft 2, and the optical axis of the lens 1 and the lens holding shaft are located above the tip of the lens holding shaft 2. An eccentricity detection device (eccentricity detection unit) 24 for detecting eccentricity with respect to the rotation center axis 2 is installed. A monitor 25 is connected to the eccentricity detection device 24, and the light emitted from the light source in the eccentricity detection device 24 is reflected by the lens 1, and the reflected light is incident on a CCD camera (not shown) in the eccentricity detection device 24. Thus, the image obtained by the CCD camera can be observed by the monitor 25. Further, a stereomicroscope 26 is installed next to the eccentricity detection device 24 for confirming the shape of the processed lens 1 as described later.

(Function)
A case where the lens 1 is centered by the lens centering apparatus of the present embodiment will be described. First, the lens 1 to be centered is temporarily held at the tip of the lens yatoy 23 with a thermoplastic adhesive softened by heating.

  Next, while the thermoplastic adhesive is softened, the lens holding shaft 2 is rotated, and the eccentricity detecting device 24 performs centering while checking the eccentricity of the lens 1 with the monitor 25. After this centering, the thermoplasticity is increased. The adhesive is cooled and the lens 1 is fixedly held at the tip of the lens yatoy 23.

  Thereafter, the table drive motors 11 and 16 are driven to move the outer peripheral surface of the lens 1 held by the lens holding shaft 2 to the vicinity of the outer peripheral surface of the grindstone 17 provided on the first grindstone shaft 18. The lens 1 is applied to a grindstone 17 that rotates while rotating the lens holding shaft 2 by driving and the outer periphery of the lens 1 is ground (see FIG. 2A).

  Next, the table drive motors 11 and 16 are driven to move the end surface of the lens 1 held on the lens holding shaft 2 to the vicinity of the outer peripheral surface of the grindstone 20 provided on the second grindstone shaft 21, thereby moving the lens holding shaft. The lens 1 is applied to the rotating grindstone 20 while rotating 2 to grind the end face of the lens 1 (see FIG. 2B).

  Subsequently, the table drive motors 11 and 16 are driven to move the ridge portion of the lens 1 held by the lens holding shaft 2 to the vicinity of the chamfered portion of the grindstone 20 provided on the second grindstone shaft 21. While rotating the holding shaft 2, the lens 1 is applied to the rotating grindstone 20, and chamfering grinding of the lens 1 is performed (see FIG. 2C).

  After the above processing is completed, the table drive motors 11 and 16 are driven, and the lens holding shaft 2 on the moving table 4 can be observed by the stereomicroscope 26 at the position where the lens 1 can be observed (two points near the stereomicroscope 26 in FIG. 1). The lens 1 is moved to the position indicated by the chain line.

  Then, the outer diameter, inner diameter, and chamfer dimensions of the lens 1 shown in FIG. 3 are measured. First, the table drive motor 16 is driven to move the movable table 4 while observing with the stereomicroscope 26 so that the one-side edge portion of the dimension to be measured of the lens 1 matches the index installed in the stereomicroscope 26, The position of the moving table 4 when the index coincides with the one-side edge portion is read by the linear scale 15 and recorded in the recording unit included in the control device 30.

  Next, the table drive motor 16 is driven to move the moving table 4 so that the index is aligned with the other edge portion of the dimension to be measured, and the position of the moving table 4 when the index and the other edge portion coincide with each other. Is read by the linear scale 15 and recorded in the recording unit. And the dimension to measure can be obtained by calculating the difference between the two positions.

  When this dimension is not a predetermined dimension for processing the lens 1, it is necessary to perform correction processing. At this time, the processing coordinates are corrected based on the shape dimension data measured by the shape measuring means as described above, and the driving of the table drive motors 11 and 16 is controlled by the control device 30, so that the lens 1 is moved. The lens 1 is corrected by processing again to obtain a lens 1 having a predetermined size and shape.

  Specifically, when correcting the processing coordinates of the outer diameter, assuming that the target outer diameter dimension is A and the measured outer diameter dimension is a, (A / 2) − (a / 2), What is necessary is just to correct and process by the coordinate correct | amended in the moving direction of the 2nd moving mechanism 12. FIG.

Further, when correcting the machining coordinates of the inner diameter, assuming that the target inner diameter dimension is B, the measured inner diameter dimension is b, and the concave curvature radius of the lens 1 is R,

The correction processing may be performed with the coordinates corrected in the moving direction of the first moving mechanism 3 by the size of.

  Further, when correcting the chamfer processing coordinates, if the target chamfer dimension is E and the measured chamfer dimension is e, the moving direction of the first moving mechanism 3 or the second direction is equal to the size of (E−e). What is necessary is just to correct and process by the coordinate correct | amended in either of the moving directions of the moving mechanism 12 of this.

(effect)
According to this embodiment, the dimension of the lens 1 after processing is measured using the linear scale 15 installed in parallel with the second moving mechanism 12 and the stereomicroscope 26 that detects the shape of the lens 1. Therefore, the shape of the lens 1 can be measured without removing the lens 1 from the processing apparatus. Even when correction processing is performed, since the lens 1 is fixed to the lens holding portion at the position where the lens 1 is first processed, it is not necessary to attach or detach the lens 1 from the lens holding portion, and high-precision correction is possible. Further, when the shape of the processed lens 1 is measured by the shape measuring means, it is not necessary to attach or detach the lens 1, so that the possibility of damaging, damaging or eliminating the lens 1 is reduced. Yield can be improved.

  Further, by using the linear scale 15 installed in parallel with the second moving mechanism 12 for measurement, it is not necessary to install a dedicated measuring instrument, and the processing apparatus can be easily configured. Can be miniaturized.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIGS. 4 is a front view of the lens centering device, FIG. 5 (a) is a front view showing a processing state of the outer periphery of the lens, FIG. 5 (b) is a front view showing a processing state of the lens end face, and FIG. ) Is a front view showing a chamfered state of the lens.

(Constitution)
As shown in FIG. 4, in the present embodiment, the second grindstone shaft 21 of the first embodiment described above is eliminated, and a chamfered portion is provided instead of the grindstone 17 provided on the first grindstone shaft 18. A disc-shaped grindstone 27 is provided. Further, a camera 28 and an image processing device 29 are provided in place of the stereomicroscope 26 as a shape measuring means for detecting the processed lens shape, so that the edge portion of the processed lens 1 can be detected.

Further, the image processing device 29 is connected to the control device 30 and can control the table drive motors 11 and 16 by data from the image processing device 29.
The same parts as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

(Function)
In the lens centering device having such a configuration, first, the lens 1 to be centered is temporarily held at the tip of the lens yatoy 23 with a thermoplastic adhesive that is softened by heating.
Next, the lens holding shaft 2 is rotated while the thermoplastic adhesive is softened, and the eccentricity detecting device 24 performs centering while checking the eccentricity of the lens with the monitor 25. After this centering, the thermoplastic adhesive Then, the lens 1 is fixed to the tip of the lens yatoy 23.

  Next, the table drive motors 11 and 16 are driven to move the outer peripheral surface of the lens 1 held by the lens holding shaft 2 to the vicinity of the outer peripheral surface of the grindstone 27 provided on the first grindstone shaft 18. While driving and rotating the lens holding shaft 2, the lens 1 is applied to the rotating grindstone 27 to grind the outer periphery of the lens 1 (see FIG. 5A).

  Next, the table drive motors 11 and 16 are driven to move the end surface of the lens 1 held by the lens holding shaft 2 to the vicinity of the end surface of the grindstone 27 provided on the first grindstone shaft 18. While rotating the lens 1, the lens 1 is applied to the rotating grindstone 27 to grind the end face of the lens 1 (see FIG. 5B).

  Subsequently, the table drive motors 11 and 16 are driven to move the ridge portion of the lens 1 held by the lens holding shaft 2 to the vicinity of the chamfered portion of the grindstone 27 provided on the first grindstone shaft 18. While rotating the holding shaft 2, the lens 1 is applied to the rotating grindstone 27 to perform chamfering grinding of the lens 1 (see FIG. 5C).

  After the above processing is completed, the table drive motors 11 and 16 are driven to move the lens holding shaft 2 on the moving table 4 to a position where the lens 1 can be observed by the camera 28 (see the two-dot chain line near the camera 28). ).

  Next, in order to measure the outer diameter, inner diameter, and chamfer dimensions of the lens 1 shown in FIG. 3, first, the image processing device 29 is moved from the image obtained by capturing the one-side edge portion of the lens 1 having a desired dimension with the camera 28. Then, the table drive motor 16 is driven to a position serving as a reference of the image processing device 29 to move the moving table 4, and the position of the moving table 4 when the reference and the one-side edge portion coincide with each other is determined by the linear scale 15. Read in.

  Next, the table drive motor 16 is driven to move the moving table 4 so that the reference matches the other edge portion of the dimension to be measured, and the moving table when the reference and the other edge portion coincide with each other is moved. 4 is read by the linear scale 15. The dimension to be measured can be obtained by taking the difference between the two positions.

  Thus, when the dimension is confirmed, when the processed lens 1 is not a predetermined dimension, it is necessary to perform a correction process. At this time, the processing coordinates are corrected, and the processing is performed again to correct the processing into a predetermined dimensional shape, thereby obtaining the lens 1 having the predetermined dimensional shape.

(effect)
According to the present embodiment, by using the camera 28 and the image processing device 29 as means for detecting the processed lens shape, the process from processing to measurement of the lens 1 can be automatically performed. Moreover, since each process of the outer periphery of the lens 1, an end surface, and chamfering can be performed only using the grindstone 27 of the 1st grindstone axis | shaft 18, size reduction of a processing apparatus can be achieved.

[Third Embodiment]
A third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a front view of the lens centering device.

(Constitution)
As shown in FIG. 6, a second linear scale 31 is installed in parallel with the guide 9 of the first moving mechanism 3 of the second embodiment described above, and this linear scale 31 is connected to the control device 30. Further, as shape measuring means for detecting the processed lens shape, touch sensors 32, 33, and 34 are installed at positions facing the outer periphery, end surface, and chamfer of the processed lens 1, respectively. These touch sensors 32, 33, and 34 are connected to the control device 30. In addition, the same part as 2nd Embodiment mentioned above attaches | subjects the same number, and abbreviate | omits description.

(Function)
A case where the lens 1 is centered by the lens centering apparatus of this embodiment will be described. First, the lens 1 to be centered is temporarily held at the tip of the lens yatoy 23 with a thermoplastic adhesive that is softened by heating.

  Then, while the thermoplastic adhesive is softened, the lens holding shaft 2 is rotated, and the eccentricity detecting device 24 performs centering while checking the eccentricity of the lens 1 on the monitor 25. After the centering, the thermoplastic adhesive Then, the lens 1 is fixed to the tip of the lens yatoy 23.

  Next, the table drive motors 11 and 16 are driven to move the outer peripheral surface of the lens 1 held by the lens holding shaft 2 to the vicinity of the outer peripheral surface of the grindstone 27 provided on the first grindstone shaft 18. Then, the lens 1 is applied to the grindstone 27 that rotates while rotating the lens holding shaft 2 by driving the motor 6, and the outer periphery of the lens 1 is ground (see FIG. 5A).

  Next, the table drive motors 11 and 16 are driven to move the end surface of the lens 1 held by the lens holding shaft 2 to the vicinity of the end surface of the grindstone 27 provided on the first grindstone shaft 18. The lens 1 is applied to the rotating grindstone 27 while rotating and the end surface of the lens 1 is ground (see FIG. 5B).

  Subsequently, the table drive motors 11 and 16 are driven to move the ridge portion of the lens 1 held by the lens holding shaft 2 to the vicinity of the chamfered portion of the grindstone 27 provided on the first grindstone shaft 18. The lens 1 is applied to a grindstone 27 that rotates while the holding shaft 2 is rotated, and the chamfering grinding of the lens 1 is performed (see FIG. 5C).

  After these series of processes are completed, the table drive motors 11 and 16 are driven to move the lens 1 to a measurement position where the touch sensors 32, 33, and 34 are installed. Then, the outer diameter of the lens 1 is measured. For this reason, the table drive motors 11 and 16 are driven to bring the outer periphery of the lens 1 into contact with the touch sensor 32. When the lens 1 comes into contact with the touch sensor 32, the information is transmitted to the control device 30, the position information of the linear scale 15 at that time is stored, and the position information and the reference position information stored in advance are stored. The outer diameter of the lens 1 is calculated by the comparison by the control device 30, and the outer diameter dimension of the lens 1 can be obtained.

  Subsequently, the table drive motors 11 and 16 are driven in order to measure the sphere depth of the lens 1, and first, the center of the spherical surface of the lens 1 is brought into contact with the touch sensor 33. When the lens 1 comes into contact with the touch sensor 33, the information is transmitted to the control device 30, and the position information on the second linear scale 31 at that time is stored (this position information is referred to as “position information 1”). ).

  Next, the table drive motors 11 and 16 are driven to bring the flat end surface of the lens 1 into contact with the touch sensor 33. The position information on the second linear scale 31 at this time is compared with the “position information 1” by the control device 30, whereby the depth of the sphere notch is calculated, and the sphere notch depth dimension is obtained. be able to.

  Next, in order to measure the chamfer size of the lens 1, the table driving motors 11 and 16 are driven to bring the chamfered portion of the lens 1 into contact with the touch sensor 34. When the lens 1 comes into contact with the touch sensor 34, the information is transmitted to the control device 30, the position information of the linear scale 15 and the second linear scale 31 at that time is stored, and the position information is stored in advance. The chamfer size is calculated by comparing the received reference position information with the control device 30, and the chamfer dimension can be obtained.

  After confirming the dimensions in this way, if the processed lens 1 does not have a predetermined dimension, it is necessary to perform correction processing. At this time, by correcting the processing coordinates and processing again, the lens 1 having a predetermined size and shape can be obtained by correcting the processing coordinates so as to have a predetermined size and shape.

(effect)
According to the present embodiment, the processing apparatus can be further miniaturized by using the second linear scale 31 and the touch sensors 32, 33, and 34 as means for detecting the processed lens shape.

  In addition, this invention is not limited to the thing of embodiment mentioned above, It can apply also to another form. Further, according to the above description, the invention of the following matters can be obtained.

1. A lens holding portion that holds the lens at the tip and can rotate with the lens around a rotation axis;
An eccentricity detecting unit for detecting a deviation between the optical axis of the lens and the rotation axis of the lens holding unit;
A grinding part for rotatably holding a grindstone for processing the lens;
A shape measuring unit for measuring the shape of a lens processed in a state of being held by the lens holding unit;
A moving device for relatively moving the lens holding unit and the shape measuring unit;
A position information detection unit that detects relative position information between the lens holding unit and the shape measurement unit;
The lens holding unit and the grinding unit are operated by operating the moving device according to information obtained by the shape measuring unit and information obtained by the position information detecting unit when correcting the shape of the lens held by the lens holding unit. A control device for adjusting the relative positional relationship between
A lens centering device comprising:

2. In the lens centering device that grinds the outer periphery, end face and chamfer of the lens by optical centering method,
A rotatable lens holding shaft that holds the lens at the tip;
A first moving mechanism capable of moving and positioning the lens holding shaft in the axial direction;
A second moving mechanism capable of moving and positioning the lens holding shaft in a direction orthogonal to the first moving mechanism;
A linear scale installed in parallel with the moving direction of the second moving mechanism;
A control device for controlling movement of the first moving mechanism and the second moving mechanism;
A grindstone shaft that rotatably supports the grindstone that performs the outer periphery, end face, and chamfering processing of the lens held by the lens holding shaft, and means for detecting the shape of the processed lens;
An eccentricity detecting device for detecting an eccentricity between an optical axis of a lens and a rotation center axis of a lens holding shaft.

3. In the lens centering method for grinding the outer periphery, end face and chamfer of the lens by optical centering method,
A rotatable lens holding shaft for holding the lens at the tip; a first moving mechanism capable of moving and positioning the lens holding shaft in the axial direction; and a movement in a direction orthogonal to the first moving mechanism; A second moving mechanism capable of positioning; a linear scale installed in parallel with a moving direction of the second moving mechanism; and a control device for controlling movement of the first moving mechanism and the second moving mechanism; A grinding wheel shaft that rotatably supports the outer periphery, end face, and chamfering wheel of the lens held by the lens holding shaft, a means for detecting the shape of the processed lens, an optical axis of the lens, and a lens holding shaft Using a lens centering device having an eccentricity detecting device for detecting eccentricity with the rotation center axis of
Aligning the optical axis of the lens with the rotation center axis of the lens holding shaft, and fixing the lens to the tip of the lens holding shaft;
Grinding the outer periphery of the lens by bringing the outer periphery of the lens into contact with the grindstone by the first moving mechanism and the second moving mechanism;
A process of grinding the lens end surface by bringing the lens end surface into contact with the grindstone by the first moving mechanism and the second moving mechanism;
A step of grinding the chamfer of the lens by bringing the lens ridge portion into contact with the grindstone by the first moving mechanism and the second moving mechanism;
Moving the lens to a position for detecting the lens shape by the first moving mechanism and the second moving mechanism, and measuring the lens shape using a linear scale installed in the lens centering device;
A lens centering method comprising the steps of:

The front view of the lens centering apparatus in 1st Embodiment of this invention. Similarly, the front view which shows each process state of the outer periphery of a lens in 1st Embodiment of this invention, an end surface, and chamfering. The front view which similarly shows the lens shape after a process in 1st Embodiment of this invention. The front view of the lens centering apparatus in 2nd Embodiment of this invention. Similarly, the front view which shows the state of the process of the outer periphery of a lens in 2nd Embodiment of this invention, an end surface, and a chamfering. The front view of the lens centering apparatus in 3rd Embodiment of this invention. The top view of the conventional lens centering apparatus. The top view which shows operation | movement of the conventional lens centering apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lens, 2 ... Lens holding shaft, 3 ... 1st moving mechanism, 4 ... Moving table 11 ... Table drive motor, 12 ... 2nd moving mechanism, 15 ... Linear scale 16 ... Table drive motor, 17 ... Grinding stone, DESCRIPTION OF SYMBOLS 18 ... 1st grindstone shaft, 19 ... Grinding wheel rotation motor 21 ... 2nd grindstone shaft, 22 ... Grinding wheel rotation motor, 24 ... Eccentricity detection apparatus, 25 ... Monitor 26 ... Stereo microscope, 27 ... Grinding wheel, 28 ... Camera, 29 ... Image processing device, 30 ... Control device

Claims (2)

A lens holding unit that holds the lens at the tip and can rotate the lens around a rotation axis;
A grinding part for rotatably holding a grindstone for processing the lens;
A moving device capable of relatively moving the lens holding portion and the grinding portion;
A shape measuring unit for measuring the shape of a lens processed in a state of being held by the lens holding unit;
The relative position relation between the lens holding part and the grinding part is adjusted by operating the moving device according to measurement information obtained by the shape measuring part, and the shape of the lens held by the lens holding part is corrected. A control device for performing grinding,
A lens centering device comprising: A centering step of fixing the lens to the lens holding portion in a state in which the optical axis of the lens and the rotation axis of the lens holding portion coincide with each other;
A grinding step of grinding the lens by bringing the lens held in the lens holding portion into contact with a grindstone;
A shape measuring step of measuring the shape of the lens while being held by the lens holding portion;
A correction grinding step for performing a grinding process for correcting the lens shape held in the lens holding portion by measurement information obtained by the shape measuring portion;
A lens centering method comprising the steps of:

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