JP2016068231A - Processing device and processing method for lens molding mold, and lens molding mold and lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing device and a processing method for a lens molding mold capable of performing rough surface processing to a flange face of a lens molding mold, by a grind stone to even depth, even when a lens molding mold is made of superhard alloy, without using a special device such as a laser device, and a lens molding mold and a lens.SOLUTION: Processing conditions are that, an eccentric amount of a grind stone 52 is 50 μm, rotation number of the grind stone 52 is 6000 rpm, rotation number of a lower mold is 20 rpm, feeding speed of the grind stone 52 is 4 mm/min, and in the processing conditions, a processing device performs polishing processing of a flange face 36, thereby, recess-state grooves or dimples whose shapes are even, and whose depth is 2.5 μm, and whose pitch is 0.2 mm are continuously or intermittently formed on the flange face 36.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a lens molding die processing apparatus and processing method, a lens molding die, and a lens.

  Light rays that pass through the lens incorporated in the optical device are not only effective rays that enter the exit surface of the lens and exit from the exit surface, but also are reflected off the flange surface and edge surface of the lens and do not need to exit from the exit surface. There are also light rays (hereinafter referred to as harmful light). Such harmful light causes generation of ghosts, flares, and the like, and hinders the function of the original optical device, so that it is necessary to prevent emission of harmful light. For this reason, a process for reducing reflection may be applied to the flange surface or the edge surface of the lens.

  In Patent Document 1, a flange surface is roughened by intermittently arranging cutter marks by an end mill on a flange surface of a lens mold that forms a flange portion of a lens, and the rough surface is processed into a lens flange. It is disclosed to transfer to a part.

  According to Patent Document 1, since the flange surface can be roughened to a uniform depth by an end mill, the surface is roughened as compared with a roughening method using sandblasting or glass shot with a nonuniform depth. Can improve the quality.

  Patent Document 2 discloses that the flange surface is roughened by irradiating the flange surface of the lens mold with a laser.

Japanese Patent No. 4813395 JP 2008-188845 A

  The surface roughening method using an end mill of Patent Document 1 is generally performed on a lens forming mold steel material or an electroless nickel phosphorus plating layer used in a plastic lens. In other words, the roughening method using an end mill is a tool that is severely worn or chipped on lens molds made of hard metal cemented carbide that molds a glass material to form a lens. Therefore, it has been difficult to efficiently perform the roughening treatment to a uniform depth.

  On the other hand, as in Patent Document 2, if a laser is used, it is possible to process irregularities on the flange surface of a cemented mold made of cemented carbide. However, an expensive laser device is required for a lens molding device using a lens molding die, and it has been difficult to form a uniform uneven shape on the flange surface with a laser.

  The present invention has been made in view of such circumstances, and even in a cemented carbide lens molding die, the flange surface of the lens molding die can be used without using a special device such as a laser device. An object of the present invention is to provide a lens molding die processing apparatus and method, a lens molding die, and a lens that can be roughened to a uniform depth with a grindstone.

  In order to achieve the object, one aspect of a lens molding die processing apparatus according to the present invention is a lens molding die flange surface in which a lens flange portion is provided. A grindstone for grinding the flange surface to be formed, a grindstone rotating means for rotating the grindstone about a grindstone rotation axis eccentric to the central axis of the grindstone, a mold holding means for holding a lens molding die, A moving means for moving the grindstone from the outer periphery of the flange surface to the inner periphery or from the inner periphery to the outer periphery by relatively moving the grindstone rotating means or the mold holding means, and a mold holding means. And rotating means for rotating around the central axis of the lens molding die.

  According to one aspect of the present invention, a grindstone rotating means for rotating a grindstone about a grindstone rotating shaft that is eccentric with respect to the central axis of the grindstone, a mold holding means for holding a lens molding die, and a grindstone rotating A moving means for moving the grindstone from the outer periphery of the flange surface to the inner periphery or from the inner periphery to the outer periphery by moving the means or the mold holding means relatively, and the mold holding means, Rotation means for rotating around the central axis of the molding die, so that even a cemented carbide lens molding die can be molded without using a special device such as a laser device. The flange surface of the metal mold can be roughened to a uniform depth with a grindstone.

  In one aspect of the present invention, the grindstone is fixed to the tip of the grindstone shaft, the center axis of the grindstone is fixed to a position that matches the center axis of the grindstone shaft, and the grindstone rotating means is connected via the grindstone shaft. The grindstone is rotated around a grindstone rotation axis that is eccentric with respect to the central axis of the grindstone axis.

  According to one aspect of the present invention, the grindstone can be rotated around the grindstone rotation axis that is eccentric with respect to the central axis of the grindstone.

  In one aspect of the present invention, the grindstone is fixed to the tip of the grindstone shaft, and the central axis of the grindstone is fixed at a position eccentric with respect to the central axis of the grindstone shaft, and the grindstone rotating means is the grindstone rotating shaft. The grindstone is rotated around the central axis of the grindstone axis.

  According to one aspect of the present invention, the grindstone can be rotated around the grindstone rotation axis that is eccentric with respect to the central axis of the grindstone.

  In one embodiment of the present invention, the grindstone is a diamond grindstone.

  According to one embodiment of the present invention, a flange surface can be efficiently ground with a diamond grindstone.

  One aspect of the processing method of the lens molding die of the present invention is a grinding wheel for grinding a flange surface of a lens molding die, which forms a flange portion of the lens, in order to achieve the object, , A mold holding means for holding a lens molding die, and the grindstone is rotated by a grindstone rotating means about a grindstone rotating shaft that is eccentric with respect to the central axis of the grindstone, and the grindstone rotating means or the mold holding means Is moved relatively by the moving means to move the grindstone from the outer periphery of the flange surface to the inner periphery or from the inner periphery to the outer periphery, and the mold holding means is used for lens molding by the rotating means. The flange surface is ground with a grindstone while rotating around the central axis of the mold.

According to one aspect of the present invention, the grindstone is rotated by the grindstone rotating means about the grindstone rotating shaft eccentric with respect to the central axis of the grindstone, and the grindstone rotating means or the mold holding means is relatively fed by the moving means. By moving, the grindstone is moved from the outer periphery to the inner periphery of the flange surface, or from the inner periphery to the outer periphery, and the mold holding means is rotated about the central axis of the lens mold. Since the flange surface is ground with a grindstone while rotating, the lens molding die flange surface can be formed without using a special device such as a laser device, even if it is a cemented carbide lens molding die. The surface can be roughened to a uniform depth with a grindstone.

  According to one aspect of the present invention, an uneven grinding mark is formed on a flange surface of a lens molding die by controlling feeding movement by a moving unit and rotation by a rotating unit.

  According to one embodiment of the present invention, an uneven grinding mark having a uniform depth and shape can be processed on the flange surface with good reproducibility.

  In one embodiment of the present invention, the grindstone is a diamond grindstone.

  According to one embodiment of the present invention, a flange surface can be efficiently ground with a diamond grindstone.

  One aspect of the lens molding die of the present invention is processed by the lens molding die processing method of the present invention in order to achieve the object.

  According to one aspect of the present invention, it is possible to provide a lens molding die in which uneven grinding marks having a uniform depth and shape are processed on the flange surface.

  In one embodiment of the present invention, the lens molding die is made of cemented carbide.

  In one aspect of the lens of the present invention, in order to achieve the object, an uneven grinding mark formed by the lens molding die of the present invention and ground on the flange surface of the lens molding die is It is transferred to the flange.

  According to one embodiment of the present invention, it is possible to provide a lens in which uneven grinding marks having a uniform depth and shape are transferred to a flange portion.

  In one embodiment of the present invention, the lens is made of glass.

  According to the present invention, even in a cemented carbide lens molding die, the flange surface of the lens molding die is roughened to a uniform depth by a grindstone without using a special device such as a laser device. Surface treatment can be performed.

(A), (B), (C) is explanatory drawing which showed the manufacturing method of the lens time-sequentially with the lens shaping die which concerns on embodiment. Perspective view showing the lens separated from the lower mold Plan view of a lens molding die processing apparatus of an embodiment Left side view of the processing apparatus shown in FIG. Side view of the main part of the processing device showing the processing method when set to the predetermined processing conditions Enlarged sectional view of the flange surface ground by the processing method of FIG. Side view showing the configuration of another embodiment of the grindstone rotating unit

  Hereinafter, a lens molding die processing apparatus and processing method, a lens molding die, and a lens according to the present invention will be described in detail with reference to the accompanying drawings.

  FIGS. 1A, 1 </ b> B, and 1 </ b> C are explanatory diagrams that show a method for manufacturing a lens 12 in a time series using the lens molding die 10 according to the embodiment of the present invention.

[Lens molding die 10]
The lens molding die 10 is a die for producing a lens 12 made of glass by molding a lens material 14, and a cemented carbide (for example, RCCFN (trade name) manufactured by Nippon Tungsten Co., Ltd.) is used. Is done. The lens molding die 10 includes an upper die 16, a lower die 18, and a barrel die 20. The lens molding die 10 may be applied to a lens molding die for producing a plastic lens by molding a plastic material.

  The lens mold 10 is not limited to cemented carbide. For example, the present invention can be applied to a lens molding die using SiC (silicon carbide), ceramics, stainless steel, and glassy carbon.

  The upper mold 16 has a fitting convex part 24 fitted into the hole part 22 of the cylindrical body mold 20. A flange surface 28 for forming the flange portion 38 of the lens 12 is formed on the lower surface, which is the molding surface of the upper mold 16. The flange surface 28 is ground and roughened by a lens molding die processing apparatus according to an embodiment described later.

  In addition, a spherical lens portion molding surface 16 a is provided on the lower surface of the upper mold 16.

  The lower mold 18 has a fitting convex portion 26 fitted into the hole portion 22 of the trunk mold 20. A flange surface 36 for forming a lens flange portion 38 is formed together with the flange surface 28 on the upper surface, which is the molding surface of the lower mold 18. The flange surface 36 is ground and roughened by a lens molding die processing apparatus according to an embodiment described later.

  Further, a spherical lens portion molding surface 18 a is provided on the upper surface of the lower mold 18.

  The body mold 20 is a mold for forming the edge surface 40 of the lens 12. It is preferable that the inner wall surface of the hole portion 22 of the body mold 20 forming the edge surface 40 is also roughened.

[Method of Manufacturing Lens 12 Using Lens Mold 10]
As shown in FIG. 1A, the product lens 12 is manufactured by molding a lens material 14 made of a transparent glass having an elliptical cross section with a lens molding die 10, for example.

  In the manufacturing method, first, the lens material 14 is placed on the upper surface of the lower mold 18. Next, the barrel mold 20 is fitted to the fitting convex portion 26 of the lower mold 18, and the fitting convex portion 24 of the upper mold 16 is fitted to the barrel mold 20, whereby the lens molding die 10. Are assembled, and the entire lens mold 10 is heated. Thereby, the lens material 14 is heated to a molding temperature, and press molding is performed by applying a predetermined pressure between the molding surfaces of the upper mold 16 and the lower mold 18. After the press molding, the lens mold 10 is gradually cooled, and then the upper mold 16 and the barrel mold 20 are separated, and the press-molded lens 12 is taken out from the lower mold 18.

Specifically, when the flange surface 28 of the upper mold 16 and the flange surface 36 of the lower mold 18 are in surface contact with the peripheral surface of the lens material 14, the flange portion 38 of the lens 12 (see FIG. 1C). ) Is formed. Further, when the inner wall surface of the hole 22 of the body mold 20 comes into surface contact with the peripheral end surface of the lens material 14, the edge surface 40 of the lens 12 is formed. Further, as shown in FIG. 1B, the lens portion molding surface 16a of the upper mold 16 and the lens portion molding surface 18a of the lower mold 18 are brought into surface contact with the central portion of the lens material 14, whereby the lens of the lens 12 is obtained. A portion 42 (see FIG. 1C) is formed.

  FIG. 2 is a perspective view showing the lens 12 removed from the lower mold 18.

  The upper surface of the flange portion 38 is roughened by transferring the rough surface of the roughened flange surface 28 (see FIG. 1). Similarly, the lower surface of the flange portion 38 is roughened by transferring the rough surface of the roughened flange surface 36 (see FIG. 1). Similarly, the edge surface 40 is preferably roughened by transferring the rough surface of the inner wall surface of the hole 22 of the body mold 20 that has been subjected to the roughening treatment.

  Therefore, in the lens 12 of the embodiment manufactured by the lens molding die 10 of the embodiment, the upper and lower surfaces of the flange portion 38 and the edge surface 40 are roughened. Therefore, the digital camera incorporating the lens 12 is provided. In an optical apparatus such as the above, it is possible to prevent the occurrence of flare and ghost during imaging of subject light.

[Processing device 50 of lens mold 10]
3 is a plan view of the processing apparatus 50 according to the embodiment, and FIG. 4 is a left side view of the processing apparatus 50 shown in FIG. The processing device 50 is also used as a manufacturing device for processing the lens portion molding surfaces 16a and 18a of the lens molding die 10 except for the grindstone 52 for roughening the flange surfaces 36 and 28 and the grindstone shaft 54 of the grindstone 52. Has been.

  The processing device 50 includes a grindstone 52, a grindstone shaft 54, a grindstone rotating unit 56 that is a grindstone rotating unit, a mold chuck table 58 that is a mold holding unit, and a driving unit 60. Further, the processing device 50 includes a control unit 62 that controls the grindstone rotating unit 56 and the driving unit 60.

  In the following embodiments, a processing method for roughening the flange surface 36 of the lower mold 18 by the processing device 50 will be described, and a processing method for roughening the flange surface 28 will be described. Since it is the same as that, description is abbreviate | omitted.

<Whetstone 52>
The grindstone 52 is a grindstone that grinds the flange surface 36. For example, a diamond grindstone is used. The grindstone 52 is, for example, a rough grindstone of about # 120 to # 600, or a medium grindstone of about # 600 to # 1500, and a count corresponding to the material of the lower mold 18 is selected. Moreover, it is preferable that the grindstone 52 is a grindstone whose cross-sectional shape is an abacus ball shape and whose cutting edge 52B is an arc shape. In addition to this grindstone, a spherical or disc-shaped grindstone may be used. Thereby, concave grooves or dimples having a uniform shape and a uniform depth, that is, grinding marks can be easily formed on the flange surface 36 with good reproducibility. The flange surface 36 is roughened by the grindstone 52 by forming concave grooves or dimples continuously or intermittently on the flange surface 36.

  The grindstone 52 is not limited to a diamond grindstone. For example, a grindstone using CBN (cubic boron nitride), alumina, or silicon carbide as an abrasive can also be applied. However, by using a diamond grindstone as the grindstone 52, the flange surface 36 can be ground efficiently compared to other grindstones.

<Whetstone shaft 54>
A grindstone 52 is integrally fixed to the tip of the straight rod-shaped grindstone shaft 54. At this time, the grindstone 52 is fixed at a position where the central axis 52A of the grindstone 52 matches the central axis 54A of the grindstone shaft 54. Of course, the outer diameter of the grindstone 52 is larger than the outer diameter of the grindstone shaft 54.

  The grinding wheel shaft 54 has a central shaft 54 </ b> A arranged in parallel to the flange surface 36 of the lower mold 18 when the flange surface 36 is processed.

<Whetstone rotating part 56>
The grindstone rotating unit 56 rotates the grindstone 52 through the grindstone shaft 54 around the grindstone rotation shaft 56A that is eccentric with respect to the central axis 54A of the grindstone shaft 54.

  Specifically, the grindstone rotating unit 56 includes a spindle 64 that rotates at high speed by a motor (not shown), and the base end of the grindstone shaft 54 is fixed to the chuck unit 65 of the spindle 64 via a collet chuck 55. . The center shaft 55A of the collet chuck 55 is aligned with the center axis 54A of the grindstone shaft 54 and is eccentric with respect to the grindstone rotation shaft 56A. Therefore, when the base end of the grindstone shaft 54 is fixed to the collet chuck 55, the grindstone shaft 54 is eccentrically rotated about the grindstone rotation shaft 56A.

  The collet chuck 55 has grades, and the runout accuracy (eccentricity) varies depending on the grade. By selecting the collet chuck 55, the eccentric amount a of the grindstone shaft 54 with respect to the grindstone rotating shaft 56A can be adjusted.

<Die chuck table 58>
The mold chuck table 58 of FIG. 4 includes a known chuck portion 66 that detachably holds the lower mold 18 on the upper surface thereof. The mold chuck table 58 is also used for manufacturing a lens molding mold in the same manner as the grindstone rotating unit 56.

<Drive unit 60>
The drive unit 60 feeds and moves the grindstone rotating unit 56 in the directions of arrows A and B in FIG. 3 orthogonal to the central axis 54A of the grindstone shaft 54, and the mold chuck table in FIG. 58 is composed of a motor 70 which is a rotating means for rotating around the central axis 18A of the lower mold 18.

  Note that the feed direction of the grindstone rotating unit 56 by the feed device 68 depends on the grinding processing start position of the grindstone 52 and is not limited to the directions of arrows A and B, but along the central axis 54A of the grindstone shaft 54. It may be a direction. That is, the feeding device 68 only needs to have a function of moving the grindstone 52 from the outer periphery of the flange surface 36 toward the inner periphery or from the inner periphery toward the outer periphery.

<< Feeding device 68 >>
The feed device 68 includes, for example, a screw shaft 72, a ball screw device 76 having a nut 74 screwed to the screw shaft 72, and a motor 78 that rotates the screw shaft 72.

  The screw shaft 72 is disposed along the moving direction of the grindstone rotating portion 56 indicated by arrows A and B, and the nut 74 is fixed to the grindstone rotating portion 56. Further, the grindstone rotating part 56 is slidably engaged with a linear motion guide 80 arranged along the moving direction of the grindstone rotating part 56.

  Thereby, when the screw shaft 72 is rotated in the forward direction and the reverse direction by the motor 78, the grindstone rotating unit 56 moves with high accuracy in the directions of arrows A and B via the nut 74. As a result, the grindstone 52 is moved along the flange surface 36 in the directions of arrows A and B. By the movement of the grindstone 52 in the direction of arrow A, the flange surface 36 is ground by the grindstone 52 and roughened. .

In the embodiment, the grindstone rotating portion 56 is moved and moved, but the mold chuck table 58 may be moved in the directions of arrows A and B, and both the grindstone rotating portion 56 and the mold chuck table 58 are fed. It may be moved. That is, the grindstone rotating unit 56 or the die chuck table 58 may be relatively fed and moved.

<< Motor 70 >>
The spindle 82 of the motor 70 is connected to the lower surface of the mold chuck table 58. The spindle 82 is arranged coaxially with the central axis 18 </ b> A of the lower mold 18 held by the chuck portion 66 of the mold chuck table 58. Thereby, the lower mold 18 is rotated around the central axis 18 </ b> A of the lower mold 18 by the driving force of the motor 70.

<Control unit 62>
The control unit 62 controls the grindstone rotating unit 56, the feeding device 68, and the motor 70. That is, the control unit 62 rotates the rotation speed of the grinding wheel 52 by the grinding wheel rotation unit 56 (rpm), the moving speed (mm / min) that is the feeding speed of the grinding wheel 52 by the feeding device 68, and the rotation of the lower mold 18 by the motor 70. The number (rpm) is controlled based on the input information.

[Method of processing flange surface 36 by processing device 50]
<Initial setting>
First, the grindstone rotating unit 56 is moved in the direction of arrow B by the feeding device 68 and is positioned at a position sufficiently separated from the mold chuck table 58. Thereafter, the lower die 18 is fixed to the die chuck table 58 by the chuck portion 66, and the base end of the grindstone shaft 54 is fixed to the chuck portion 65 of the spindle 64 via the collet chuck 55. At this time, the central axis 54 </ b> A of the grindstone shaft 54 is parallel to the flange surface 36.

  Next, the position of the grindstone 52 is adjusted. In this case, since the grindstone 52 is eccentrically rotated about the grindstone rotation shaft 56A together with the grindstone shaft 54, the vertical position in FIG. 4 is adjusted in consideration of the amount of eccentricity and the target dimple depth. Further, as shown in FIG. 4, the entire drive unit 60 is moved so that the central axis 18 </ b> A of the lower mold 18 and the cutting edge 52 </ b> B of the grindstone 52 coincide. As a means for adjusting the height of the grindstone 52, a device such as a ball screw device that moves the entire drive unit 60 up and down may be used.

  Next, the grindstone 52 is moved by the feeding device 68 to the grinding start position close to the flange surface 36 outside the flange surface 36.

  Next, the controller 62 sets the rotational speed (rpm) of the grindstone 52, the feed speed (mm / min) of the grindstone 52 by the feeding device 68, and the rotational speed (rpm) of the lower mold 18 by the motor 70. This completes the initial setting.

<Grinding>
The grindstone shaft 54 is rotated about the grindstone rotation shaft 56 </ b> A that is eccentric with respect to the central shaft 54 </ b> A of the grindstone shaft 54 by the grindstone rotation unit 56. Then, the grindstone rotating unit 56 is moved and moved in the direction of arrow A by the feeding device 68, and the lower mold 18 is rotated about the central axis 18A by the motor 70.

  Thereby, the entire surface of the flange surface 36 is ground by the grindstone 52 from the outer periphery to the inner periphery of the flange surface 36. Since the grindstone 52 is eccentrically rotated, the flange surface 36 is formed with concave grooves or a plurality of dimples having a uniform depth and regularly arranged.

  Therefore, according to the processing apparatus 50 and the processing method of the embodiment, the flange surface of the lower mold 18 can be used without using a special apparatus such as a laser apparatus even if the lens mold 10 is made of cemented carbide. 36 can be efficiently roughened to a uniform depth.

〔Example〕
FIG. 5 is a side view of the main part of the processing apparatus 50 showing a processing method when the processing conditions are set to the following conditions.

  The eccentric amount of the grindstone 52 is 50 μm, the rotation speed of the grindstone 52 indicated by the arrow C is 6000 rpm, the rotation speed of the lower mold 18 is 20 rpm, and the feed speed of the grindstone 52 in the direction orthogonal to the paper surface of FIG. Under the processing conditions, the flange surface 36 was ground by the processing device 50.

  6A is an enlarged plan view of the main part of the flange surface 36 ground by the processing method of FIG. 5, and FIG. 6B is a view of the flange surface 36 of FIG. 6C is an enlarged cross-sectional view of the flange surface 36 of FIG. 6A as viewed from the direction of the arrow Y (the direction orthogonal to the arrow X).

  According to the processing method of the embodiment, as shown in FIGS. 6A to 6C, a concave groove or dimple 84 having a uniform shape with a depth b of 2.5 μm and a pitch p of 0.2 mm is formed on the flange surface. 36 could be formed continuously or intermittently.

  In addition, in the alignment (assembly) of the high-precision processing planes (mirror surfaces), there is a problem that the surfaces stick to each other. However, according to the processing apparatus 50 of the embodiment, the bonding is performed while forming the high-precision processing plane. It was possible to form a surface that prevents sticking, that is, a surface having a scraping effect.

  FIG. 7 is a side view showing the configuration of another embodiment of the grindstone rotating unit 56.

  According to FIG. 7, the grindstone rotating shaft 56A and the central axis 54A of the grindstone shaft 54 are matched, and the central axis 52A of the grindstone 52 is eccentric by 50 μm with respect to the grindstone rotating shaft 56A and the central axis 54A of the grindstone shaft 54. ing.

  That is, the grindstone 52 is fixed to the tip of the grindstone shaft 54, and the center shaft 52 </ b> A of the grindstone 52 is fixed to a position that is eccentric with respect to the central shaft 54 </ b> A of the grindstone shaft 54. Further, the grindstone rotating unit 56 rotates the grindstone 52 around the central axis 54A of the grindstone shaft 54 that is coaxial with the grindstone rotating shaft 56A.

  Even in such an embodiment, the same grinding process as that of the grindstone rotating unit 56 shown in FIG. 5 can be performed.

  According to the method for processing a lens molding die shown in FIGS. 5 and 7, it is possible to provide a lens molding die in which uneven grinding marks having a uniform depth and shape are processed on the flange surface 36. it can.

  Further, by using such a lens molding die, it is possible to provide the lens 12 in which uneven grinding marks having a uniform depth and shape are transferred to the flange portion 38.

  Further, by using the mold 10 having the concave and convex flange surface 36 for the lens molding die 10, when the glass lens 12 is cooled and contracted, the flange portion of the lens 12 molded by the flange surface 36. Since 38 easily slides on the mold surface and floats from the mold 10, the releasability of the lens 12 with respect to the mold 10 is improved.

  As mentioned above, although the processing apparatus and the processing method of the lens shaping die which concern on embodiment, and the lens shaping die, and the lens were demonstrated in detail, this invention is not limited to the above example, The summary of this invention is provided. Of course, various improvements and modifications may be made without departing from the scope.

DESCRIPTION OF SYMBOLS 10 ... Lens molding die, 12 ... Lens, 14 ... Lens material, 16 ... Upper die, 18 ... Lower die, 20 ... Body die, 22 ... Hole, 24 ... Fitting convex part, 26 ... Fitting Convex part, 28 ... flange surface, 36 ... flange surface, 38 ... flange part, 40 ... edge surface, 42 ... lens part, 50 ... processing device, 52 ... grinding wheel, 54 ... grinding wheel shaft, 55 ... collet chuck, 56 ... grinding wheel Rotating part, 56A ... grinding wheel rotating shaft, 58 ... mold chuck table, 60 ... driving part, 62 ... control part, 64 ... spindle, 65 ... chuck part, 66 ... chuck part, 68 ... feed device, 70 ... motor, 72 ... Screw shaft, 74 ... Nut, 76 ... Ball screw device, 78 ... Motor, 80 ... Linear motion guide, 82 ... Spindle, 84 ... Concave groove or dimple

Claims (11)

In the lens molding tool processing equipment,
A grinding wheel for grinding the flange surface of the lens molding die, the flange surface forming the flange portion of the lens, and
A grindstone rotating means for rotating the grindstone about a grindstone rotating shaft eccentric with respect to the central axis of the grindstone;
Mold holding means for holding the lens molding mold;
Moving means for moving the grindstone from the outer periphery to the inner periphery, or from the inner periphery to the outer periphery, by relatively feeding and moving the grindstone rotating means or the mold holding means;
Rotating means for rotating the mold holding means about the central axis of the lens molding mold;
An apparatus for processing a lens molding die comprising: The grindstone is fixed to the tip of the grindstone shaft, and the central axis of the grindstone is fixed to a position that matches the central axis of the grindstone shaft,
2. The lens molding die processing apparatus according to claim 1, wherein the grindstone rotating means rotates the grindstone about the grindstone rotation axis that is eccentric with respect to the central axis of the grindstone axis via the grindstone axis. . The grindstone is fixed to the tip of the grindstone shaft, and the central axis of the grindstone is fixed at a position eccentric with respect to the central axis of the grindstone shaft,
2. The lens molding die processing apparatus according to claim 1, wherein the grindstone rotating means rotates the grindstone about a central axis of the grindstone shaft that is the grindstone rotation axis. 3.   The lens grinding mold processing apparatus according to claim 1, wherein the grinding stone is a diamond grinding stone. A grinding wheel for grinding a flange surface of a lens molding die, which forms a flange portion of the lens, and a mold holding means for holding the lens molding die,
The grindstone is rotated around a grindstone rotation axis that is eccentric with respect to the central axis of the grindstone by a grindstone rotating means,
While moving the grindstone rotating means or the mold holding means relatively by moving means, the grindstone is moved from the outer periphery of the flange surface toward the inner periphery, or from the inner periphery to the outer periphery, A method for processing a lens molding die, wherein the flange surface is ground by the grindstone while the mold holding unit is rotated by a rotating unit about a central axis of the lens molding die.   6. The processing of the lens molding die according to claim 5, wherein grinding traces are formed on the flange surface of the lens molding die by controlling the feed movement by the moving unit and the rotation by the rotating unit. Method.   The method for processing a lens molding die according to claim 5 or 6, wherein the grindstone is a diamond grindstone.   A lens molding die processed by the method for processing a lens molding die according to any one of claims 5 to 7.   The lens molding die according to claim 8, wherein the lens molding die is made of cemented carbide.   10. A lens formed by the lens molding die according to claim 8 or 9, and grinding marks that are ground on the flange surface of the lens molding die are transferred to a flange portion of the lens. The lens according to claim 10, wherein the lens is made of glass.

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