JP2005177931A - Method of centering and edging optical member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centering and edging method for producing an optical member of high quality by minimizing chipping in the case of machining the outer peripheral surface of the optical member which is a machined object, to prevent cracking of the optical member. <P>SOLUTION: In this centering and edging method, chamfering is performed prior to machining the outer peripheral surface of a lens member 1, and after chamfering, the remaining outer peripheral part of the lens member 1 is machined. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for centering an optical member.

  If the method of centering an optical member such as a lens member is roughly classified according to the centering method performed prior to the centering processing, it can be 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 optical member is transmitted or reflected to form an image on the lens member, and this image is observed at the eyepiece to detect the eccentric state of the optical member. It is a thing to do the centering. On the other hand, in the bell clamp method, an optical member 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 slide the optical member to a predetermined position. It is a thing to do.

When centering is performed with high accuracy and high quality is obtained, an optical centering method is often employed, and a centering apparatus employing this optical centering method is disclosed in Patent Document 1. .
As shown in FIG. 8, the centering machine described in Patent Document 1 includes a cylindrical lens holder 51 for holding an optical member 50 as a centering object, an observation optical centering device 52, Is provided. The observation optical centering device 52 includes a light source 61, a chart 62, lens members 63 and 64, a half mirror 65, a lens member 66, and an eyepiece lens 67.

  When centering is performed on the optical member 50 with this centering machine, first, the optical member 50 to be centered is vacuum-sucked to the tip of the lens holder 51 as shown in FIG. Thereafter, the optical member 50 is centered by the optical centering device 52. That is, the light beam emitted from the light source 61 is collected on the chart 62 and reflected by the surface of the optical member 50 through the lens members 63 and 64. The reflected light beam is reflected by a half mirror 65 provided between the lens members 63 and 64 at a right angle, and an image formed by the lens member 66 is observed by the eyepiece 67 while rotating the lens holder 51. . When the rotation center of the optical member 50 and the optical axis do not match, the image rotates to draw a circle, and then the position of the optical member 50 is adjusted so that the image matches the optical axis. 50 centering.

  Next, as shown in FIG. 9, the heating device 71 is brought close to the lens holder 51 to heat the lens holder 51. Then, the spear 73 is supplied from the spear holder 72 and the optical member 50 is fixed to the lens holder 51. Thereafter, the heating device 71 and the scraper holder 72 are retracted from the vicinity of the lens holder 51.

Thereafter, as shown in FIG. 10, the grindstone 74 provided at the same machine and rotating at a high speed moves back and forth in the axial direction of the lens holder 51 while moving along the circumferential surface of the optical member 50. The outer surface of the optical member 50 is ground by contacting the surface.
Japanese Utility Model Publication No.59-167647

  In the centering machine described in Patent Document 1 described above, when grinding the outer diameter of the optical member 50, the grindstone 74 that rotates at high speed moves along the outer peripheral surface of the optical member 50 to perform processing. For this reason, vibration is generated in the member or the like that movably supports the grindstone 74 as the grindstone 74 rotates at high speed. In addition, this vibration is also transmitted to the grindstone 74, whereby unnecessary vibration is generated in the grindstone 74 during the outer diameter grinding of the optical member 50, and the sharp ridges on the outer peripheral surface of the optical member 50 are chipped. There was a problem to cause.

  The present invention has been made in view of such conventional problems, and minimizes chipping when processing the outer peripheral surface of the optical member to be processed to prevent cracking of the optical member. An object of the present invention is to provide a centering method capable of producing a high-quality optical member.

According to the first aspect of the present invention, in the centering process of the optical member, the chamfering process is performed in advance before the outer peripheral surface of the optical member is processed, and the remaining outer peripheral part of the optical member is processed after the chamfering process. This is a method for centering an optical member.
According to the second aspect of the present invention, in the centering process of the optical member, the chamfering process is performed in advance before the outer peripheral surface of the optical member is processed, and after the chamfering process, the outer periphery of the optical member is left leaving a chamfered portion. This is a method for centering an optical member, characterized in that the part is processed.
In the centering process of the optical member, the invention according to claim 3 performs the chamfering process in advance before processing the outer peripheral surface of the optical member, and after the chamfering process, the processing of the outer peripheral part of the optical member until the chamfered part disappears. This is a method of centering an optical member characterized in that

  According to the present invention, the sharp edge of the outer periphery of the optical member of the workpiece becomes an obtuse angle, reducing the influence and impact of vibration generated with high-speed rotation of the grindstone, and reducing chipping due to vibration as much as possible. be able to.

  Hereinafter, the present invention will be specifically described with reference to embodiments illustrated in the drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram of a centering apparatus in a state where an optical member as a processing object is attached to a holder. FIGS. 2, 3, 4 and 5 show the optical member by the centering apparatus. It is explanatory drawing which shows the process sequence in the case of grinding.

(Constitution)
The object to be processed in the present embodiment is a lens member 1 of an optical member as shown in FIG. The lens member 1 has a flat shape with one surface being flat, and the other surface being a concave shape. The lens member 1 is held by a holder 2 of a centering device when being processed.

  The holder 2 of the centering apparatus is formed by a cylindrical shaft member. The tip portion 2a for holding the lens member 1 is formed in a tapered shape, and the lens member 1 is held by contacting one surface of the lens member 1 as a workpiece to the tip of the tip portion 2a. It has become. Further, as indicated by arrows in FIG. 1, the holder 2 of the centering device is rotated around an axis about the workpiece axis L and reciprocated in the axial direction of the workpiece axis L by a driving device (not shown). A move is made. Further, the inner space 3 of the holder 2 is connected to a suction device (not shown), and vacuum suction is performed as necessary.

  As shown in FIG. 1, the centering device of this embodiment can be moved in the vertical direction perpendicular to the workpiece axis L by a driving device (not shown) provided in the same machine and is rotated at a high speed. A grinding wheel 5 for grinding as a processing tool is provided. The center line of the rotating shaft 6 of the grinding wheel 5 is parallel to the workpiece axis L. Further, the grinding wheel 5 is formed with a flat outer peripheral processing grindstone surface 5a along the direction of the rotary shaft 6 and chamfering grindstone surfaces 5b and 5c that are inclined in opposite directions at the front and rear edges thereof. ing.

(Function)
Next, a procedure for processing the lens member 1 to be processed by the centering apparatus will be described.
1. As shown in FIG. 1, the lens member 1 is held by the holder 2 by applying a flat surface portion of a so-called plano-concave lens member 1 to the tip 2 a of the holder 2 of the centering device. In this holding state, when the holder 2 is rotated, the tip 2a of the holder 2 is appropriately processed with a tool (not shown) so that the tip 2a of the holder 2 does not shake (lens member shake adjustment step). ).

  2. Next, the lens member 1 is centered with respect to the holder 2 by the optical centering method as described above, and the flat surface side portion of the lens member 1 is illustrated on the front end portion 2a of the holder 2 with a thermoplastic adhesive. It is heated and glued with a jig and is held by positioning (lens member centering holding process).

  3. Thereafter, as shown in FIG. 2, the grinding wheel 5 is rotated, and the grinding wheel 5 is moved to the vicinity of the outer periphery of the lens member 1 held by the holder 2 that moves left and right while continuing this rotation. First, the chamfering grindstone surface 5b of the grinding grindstone 5 is used to grind the concave side ridge 1b of the lens member 1 and chamfer it to a predetermined indicated dimension. Further, as shown in FIG. 3, the lens member 1 is moved to a position where the flat surface side ridge portion 1 c side portion of the lens member 1 faces the chamfering grindstone surface 5 c of the grinding grindstone 5, and the chamfering of the grinding grindstone 5 is performed. The flat surface side ridge 1c of the lens member 1 is cut out by the processing grindstone surface 5c, and chamfered to a predetermined indicated dimension. Thereby, the chamfering process of the lens member 1 is completed.

  4). Next, as shown in FIG. 4, the lens member 1 is moved to a position where the outer peripheral surface 1 a of the lens member 1 faces the outer peripheral processing grindstone surface 5 a of the grinding wheel 5, and the lens member 1 is moved to the left and right for grinding. The outer peripheral grinding wheel surface 5a of the grindstone 5 is brought into contact with the outer peripheral surface of the lens member 1, the outer peripheral surface 1a of the lens member 1 is ground to the indicated dimension, and outer diameter grinding is performed, whereby the processing of the lens member 1 is completed.

  When the lens member 1 is removed from the holder 2 after being processed to finish dimensions in this way, the optical member 8 that has been subjected to predetermined chamfering and outer periphery processing as shown in FIG. 5 is finally completed.

(effect)
As described above, before the outer peripheral surface of the lens member 1 as an optical member is processed, the lens member 1 is first chamfered, so that when the outer peripheral processing of the lens member 1 is performed, an acute ridge is formed. The obtuse angle and the vibration and impact applied to the ridges on the outer peripheral surface of the lens member 1 can be reduced, so that chipping, chipping, and canning that are likely to occur can be minimized, and advanced centering can be performed.

  In the present embodiment, the processing of the plano-concave optical member has been described, but the same effect can be obtained even in the case of other optical member shapes. For example, the flat surface of the lens member may be a convex shape. Further, the grindstone to be chamfered and the grindstone to be peripherally processed may be processed with different grindstone counts depending on the characteristics and quality of the optical member. Furthermore, when the optical member side provided in the same machine is fixed and the grindstone side moves to the left and right and up and down in the figure, or the grindstone side is fixed and the optical member side moves to the left and right and up and down in the figure to process In this case, even when the optical member side is moved in the vertical direction in the figure and the grindstone side is moved in the horizontal direction in the figure, the same effect can be obtained.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS. 6 and 7 are explanatory views showing a processing procedure for grinding the optical member by the centering device.

(Constitution)
The present embodiment is for processing an optical member that does not require a chamfered portion. The centering apparatus used in this embodiment is the same as that of the first embodiment described above. The same elements are associated with the same reference numerals.

(Function)
A procedure for processing the lens member 1 in the present embodiment will be described.
1. A flat surface side portion of a so-called plano-concave lens member 1 is applied to the tip 2 a of the holder 2 of the centering device, and the lens member 1 is held by the holder 2. In this holding state, when the holder 2 is rotated, the tip 2a of the holder 2 is appropriately processed with a tool (not shown) so that the tip 2a of the holder 2 does not shake (lens member shake adjustment step). ).

  2. Next, the lens member 1 is centered with respect to the holder 2 by the optical centering method as described above, and the flat surface side portion of the lens member 1 is illustrated on the front end portion 2a of the holder 2 with a thermoplastic adhesive. The lens member 1 is held by the holder 2 by heating with a non-stick jig (lens member centering holding step).

  3. Thereafter, as shown in FIG. 6, while rotating the grinding wheel 5 provided in the same machine, the grinding wheel 5 is moved to the lens member 1 held by the holder 2 that is moving left and right, The concave ridge 1b of the lens member 1 is chamfered to a position of a dimension D that is 0.02 mm to 0.05 mm larger than the outer diameter indicating dimension by the chamfering grindstone surface 5b of the grinding grindstone 5.

  Similarly, the lens member 1 is moved to the chamfering grindstone surface 5c side, and the flat surface side ridge portion 1c side portion is 0.02 mm to 0.05 mm larger than the outer diameter instruction size by the chamfering grindstone surface 5c of the grindstone 5 for grinding. Chamfering to dimension D.

  Next, the lens member 1 is moved to the outer peripheral processing grindstone surface 5a of the grinding stone 5, and is 0.02 mm to 0.05 mm larger than the outer diameter indicating dimension chamfered in contact with the outer peripheral surface 1a of the lens member 1. Grind to dimension D. Further, 0.02 mm to 0.05 mm up to the final indicated dimension is subjected to outer diameter grinding, and the optical member 8 having no chamfered portion is finished as shown in FIG.

(effect)
Before the outer peripheral surface of the lens member 1 as an optical member is processed, chamfering to a size 0.02 mm to 0.05 mm larger than the outer diameter is performed first, whereby an acute ridge becomes an obtuse angle. Grinding can be performed with a minimum grinding amount of 0.02 mm to 0.05 mm up to the indicated dimension. For this reason, vibrations and impacts applied to the ridges on the outer peripheral surface of the lens member 1 as an optical member can be reduced, high-level centering can be performed that can minimize chipping, chipping, and canning, and high-quality optics. A member can be manufactured.

  In the present embodiment, processing of so-called plano-concave optical members has been described, but the same effect can be obtained even in the case of other optical member shapes. Depending on the characteristics and quality of the optical member, the grindstone to be chamfered and the grindstone to be peripherally processed may be processed with different grindstone counts. Finish grinding can be performed with the minimum amount of grinding to the final indicated dimension, and highly accurate centering can be performed. If a grinding wheel with a fine count is used for finishing grinding, centering with higher accuracy is possible. Also, when the optical member side provided in the same machine is fixed and the grindstone side moves to the left and right and up and down in the figure, or when the grindstone side is fixed and the optical member side moves to the left and right and up and down in the figure to process In this case or even when the optical member side is moved in the vertical direction in the figure and the grindstone side is moved in the horizontal direction in the figure, processing that can obtain the same effect is possible.

(effect)
According to the present embodiment, by performing the chamfering process first before processing the outer peripheral surface of the optical member, when performing the outer peripheral processing, the acute ridge portion becomes an obtuse angle in advance, and the ridge portion of the outer peripheral surface of the optical member By reducing the vibration and impact applied to the optical member, it is possible to manufacture a high-quality optical member that minimizes chipping, chipping, and canning.

Explanatory drawing of the centering apparatus used for the centering process method which concerns on 1st Embodiment of this invention. Explanatory drawing of the process sequence of the centering process similarly similarly to 1st Embodiment. Explanatory drawing of the process sequence of the centering process similarly similarly to 1st Embodiment. Explanatory drawing of the process sequence of the centering process similarly similarly to 1st Embodiment. Similarly, the longitudinal cross-sectional view of the lens member processed by the centering method according to the first embodiment. Explanatory drawing of the centering processing apparatus used for the centering processing method which concerns on 2nd Embodiment of this invention. Similarly, the longitudinal cross-sectional view of the lens member processed by the centering method according to the first embodiment. The side view of the principal part of the conventional centering machine. The side view which shows the state which attaches a lens with the conventional centering machine. The side view which shows the state which grinds a lens with the conventional centering machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lens member, 1b ... Concave side ridge part, 1c ... Flat surface side ridge part 1a ... Outer peripheral surface, 2 ... Holder, 5 ... Grinding grindstone, 5a ... Outer peripheral processing grindstone surface 5b ... Chamfering grindstone surface, 5c ... Chamfering Grinding wheel surface, 6 ... Rotating shaft

Claims (3)

An optical member characterized in that, in the centering of the optical member, the chamfering is performed in advance before the outer peripheral surface of the optical member is processed, and the outer peripheral portion of the optical member is processed after the chamfering Centering method. In the chamfering of the optical member, the chamfering of the finishing dimension is performed in advance before the outer peripheral surface of the optical member is processed, and after the chamfering, the outer peripheral portion of the optical member is processed while leaving the chamfered portion. An optical member centering method characterized by the above. In the centering process of the optical member, the chamfering process is performed in advance before the outer peripheral surface of the optical member is processed, and after the chamfering process, the outer peripheral part of the optical member is processed until there is no chamfered part. A centering method for the optical member.

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