JP2945021B2 - Lens processing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lens processing method, and more particularly, to a lens processing method for performing spherical grinding, peripheral side surface and chamfering of a lens to be processed into a lens spherical surface.

[Conventional technology]

FIG. 12 shows a conventional lens grinding apparatus, in which a lens 52 is held by a lens holder 54 of a lens holder 53 via an adhesive 55, and the lens holder 53 is rotatable about its central axis. The grinding wheel 57 for spherical grinding is a lens holder
It is fixed to a spherical grinding spindle 56 opposite to 53. The peripheral surface grinding spindle 58 is a spherical grinding spindle
It has a rotation axis in a direction perpendicular to 56, and a grindstone 59 for peripheral side surface grinding is fixed to the tip thereof.

In the above apparatus, the lens 52 is fixed to the lens holder 53, and then the rotating spherical grinding wheel 57 comes into contact with the lens 52 to grind the lens to obtain a desired curvature.
The peripheral side surface grinding spindle 58 is rotated, and the peripheral side surface of the lens 52 is ground by the peripheral side surface grinding wheel 59. Such a technique is disclosed in JP-A-59-192449.

FIG. 13 shows a second example of a conventional lens grinding apparatus. In the same figure, on the opposite side of the lens holder of the lens holder 62, a control motor 65 for moving the lens 61 in parallel with its rotation axis 62a is provided, and the whetstone 63 is attached to the whetstone 63 with respect to its rotation axis 63a. A control motor 66 for moving in the vertical direction is provided. The grindstone 63 and the control motor 66 are mounted on a fan-shaped base 67.
Is rotatable about a rotation center 67a by a control motor 68.

In the above-described apparatus, when a convex curved surface is formed on the lens, the rotating shaft 63a of the grindstone 63 is inclined at a predetermined angle with respect to the rotating shaft 62a of the lens holder 62, and the lens surface of the lens 61 on the rotating shaft 62a. The grinding surface of the grindstone 63 is positioned at a position, and the curved surface is formed by rotating the grindstone 63 while rotating the lens holder 62 holding the lens 61.
Then, the control device 69 drives the control motors 65, 66, 68 to position the rotation shaft 62a of the lens holder 62 and the rotation shaft 63a of the grindstone 63 in accordance with the chamfer angle (for example, 45 °). In this state, the control motor 66 is driven to move the grindstone 63 to its rotation axis.
The outer periphery of the lens 61 (the outer peripheral edge of the convex curved surface) is chamfered (45 ° chamfer) by reciprocating in the direction perpendicular to 63a. Such a technique is disclosed in JP-A-62-152664.

[Problems to be solved by the invention]

In the lens grinding apparatus disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 59-192449, the outer grinding of the lens (peripheral side grinding) is performed.
However, since a separate chamfering device is required, there is a problem that the manufacturing process is expensive and complicated.

Further, in the lens grinding device disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 62-152664, chamfering of a lens can be performed, but a separate centering device is required, so that the manufacturing process is expensive and complicated. It has a defect that requires a large number of steps.

The present invention has been made in view of the above points, and moves a rotation axis of a grinding spindle to which a spherical grinding wheel and a peripheral side grinding wheel of a lens are attached to an arbitrary position with respect to a rotation axis of a work spindle. The above-mentioned disadvantages of the conventional lens grinder are solved by continuously performing all the steps of spherical grinding, peripheral side grinding and chamfering grinding of a processing lens by using a grinding wheel which enables to perform and continuous grinding. It is another object of the present invention to provide a lens processing method using a lens grinder, which realizes a significant reduction in the number of steps.

[Means and actions for solving the problems]

In order to achieve the above object, a lens processing method according to the present invention includes a step of holding a processing lens on a work spindle, a step of holding a grindstone disposed to face the processing lens on a grinding spindle, Tilting a rotation axis at a desired angle with respect to the rotation axis of the work spindle, moving the grinding spindle in a direction perpendicular to the rotation axis, and rotating at least one of the work spindle and the grinding spindle By moving in the axial direction, the tip surface of the grindstone is brought into contact with the processing lens, the step of spherical processing the processing lens, and the rotation axes of the work spindle and the grinding spindle are parallel to each other, Contacting the side surfaces of the grindstone to process the peripheral surface of the processing lens; and the work spindle and the grinding spin And parallel to each other in the rotational axis Le, and abutted against so chamfered grinding unit of the grinding wheel for machining a lens, and a step of chamfering the uncut lens.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 11.

First Embodiment FIG. 1 is a front view of a vertical type (corresponding to a plan view in a horizontal type) showing a first embodiment of the present invention. This is a work spindle that can move in the axial direction by suction chucking. Processing lens 2
Are fixed to the lens holder 4 by an adhesive 5. A control motor 9 for moving the grinding wheel 6 at a right angle to a grinding spindle 6 having a spherical grinding wheel 7 and a peripheral surface grinding wheel 8 attached to its tip is provided. Further, the grinding spindle 6 is provided with a control motor 10 for moving in the axial direction. Grinding spindle 6 and control motor 9
And 10 are mounted on a substantially fan-shaped base 11, which is in the vicinity of the contact position between the lens 2 and the tip of the spherical grinding wheel 7 (on the extension of the work axis and centered on the top of the lens). (Actually, there may be a slight deviation). The motor 12 is rotatable about the rotation center. Furthermore, the control motors 9, 10, 12
Are connected to a control device 13 so that the relative angle, the moving direction, and the moving position of the spherical grinding wheel 7 and the peripheral surface grinding wheel 8 with respect to the lens 2 can be freely set under the control of the control device 13. . The grinding wheel 7 for spherical grinding and the grinding wheel 8 for peripheral side grinding may be manufactured by pasting or integrally manufactured.

In this embodiment, when a convex surface is formed on the lens, as shown in FIG. 2, first, the processing lens 2 is placed on the upper surface of the lens holder 4 so that the center axis of the processing lens 2 and the center axis of the lens holder 4 are substantially coincident. Then, it is fixed with the adhesive 5. Next, the lens holder 4 is suction-chucked so that the center axis is aligned with the work spindle 3. Then, when the tip surface of the grinding wheel 7 for spherical grinding is in contact with the processing surface of the processing lens 2 and the lens is ground, a desired curvature is obtained.
The control device 13 adjusts the position of the grinding spindle 6 in the vertical and horizontal directions (front and rear and left and right positions in the case of the horizontal type) and the inclination angle of the rotating shaft. Next, the work spindle 3 and the grinding spindle 6 are rotated, and the spherical surface of the processing lens 2 is ground by the grinding wheel 7 for spherical grinding. On the other hand, as shown in FIG. 3, when the side surface of the grinding wheel 8 for grinding the peripheral side surface comes into contact with the processing surface of the processing lens 2 to grind the lens,
The grinding spindle 6 is adjusted by the control device 13 so as to obtain a desired diameter. Next, the work spindle 3 and the grinding spindle 8 are rotated and the processing lens 2 is rotated.
Is ground by a peripheral side grinding wheel 8. Also,
On the other hand, as shown in FIG. 4, the grinding spindle 6 is adjusted by the control device 13 so that the chamfer grinding portion 8a comes into contact with the processing surface of the processing lens 2. Next, the work spindle 3 and the grinding spindle 8 are rotated and the chamfered portion of the processing lens 2 is ground by the chamfered grinding portion 8a.

Therefore, in this embodiment, this series of grinding is processed by one grinding spindle 6, and the cost of the tool is reduced because there is only one grinding wheel. Further, since the curved surface processing, the peripheral side surface processing, and the chamfering processing are performed continuously only by holding the processing lens 2 once without tool exchange, there is an effect that the number of steps can be greatly reduced.

When a concave surface is formed on the lens, as shown in FIG. 5, a spherical surface is created by positioning the spherical grinding wheel 7 as shown. After the creation of this concave surface, the control motors 9, 10, 12 are driven to move the grinding spindle 6 to the position shown in FIG. The lens 2 can be ground to a desired diameter. Thereafter, the control motor 10 is driven to bring the chamfering grinding portion 8a into contact with the chamfered grinding portion 8a in the same manner as in the case of the convex surface grinding, whereby desired chamfering is performed on the processing lens 2.

Further, it is also possible to perform the curved surface processing after the peripheral surface processing and the chamfering processing are performed first by the grinding means. As an effect of this, it is possible to prevent the edge of the peripheral side surface from being applied.

In the above-described embodiment, it is also possible to repeat a method of performing the curved surface processing and the peripheral side surface processing, and then performing the second processing procedure in reverse order, such as chamfering, peripheral side surface processing, and curved surface processing. The effect of this method is that there is no waste in the movement of the grinding wheel, leading to a reduction in the number of steps.

(Second Embodiment) FIG. 7 is a lens grinding machine showing a second embodiment of the present invention.
21 is a configuration diagram of FIG. The structure of the lens grinding machine 21 is substantially the same as that of the lens grinding machine 1 shown in FIG. 1, except that a spherical grinding wheel 27 is disposed inside a peripheral surface grinding wheel 28. Both grinding wheels are detachably attached to each other from a grinding spindle via a connecting portion (not shown). The entire grinding wheel 28 for peripheral side surface grinding may have grinding wheel properties, but only the outer peripheral surface and the top surface, which are the grinding surfaces, may have grinding wheel properties by electrodeposition or the like. Description of the other same components will be omitted.

In this embodiment, as in the first embodiment, the spherical grinding wheel 27 abuts on the processing surface of the processing lens 22 and grinds it to a desired curvature as shown in FIG. Then, the peripheral surface grinding wheel 28 is adjusted by the control device so as to abut the processing surface of the processing lens 22, and is ground to a desired diameter. Further, the chamfering grinding section 28a is adjusted by the control device so as to contact the chamfered section of the processing lens 22, and a desired chamfering amount is ground.

The effect of this embodiment is that the lens holder 4 can be shortened without the spherical grinding wheel 7 protruding as shown in FIGS. 4 and 6 of the first embodiment.

(Third Embodiment) FIG. 10 shows a third embodiment of the present invention. The structure of a lens grinder 31 is substantially the same as that of the lens grinder 1 of FIG. Wheel 37 and peripheral grinding wheel
38 is integrally attached to the spindle and has a hollow cylindrical shape. The description of the other same components will be omitted.

In this embodiment, the grinding wheel is the same as in the first embodiment.
37 contacts the processing surface of the processing lens 32 and grinds to the desired curvature, while the control device adjusts the peripheral side surface of the grinding wheel 37 to contact the processing surface of the processing lens 32 as shown in FIG. Then, it is ground to a desired diameter. In addition, the control unit adjusts the tip of the grinding wheel 37 so as to abut the chamfered portion of the processing lens 32 to grind a desired chamfered amount.

The effect of this embodiment is that the grinding wheel can have a simple shape, so that the tool manufacturing cost can be reduced. In addition, it is compatible with any processed lens shape and is versatile.

(Fourth Embodiment) FIG. 11 is a lens grinding machine 41 showing a fourth embodiment of the present invention.
FIG. The construction of the lens grinding machine 41 is almost the same as that of the lens grinding machine 1 shown in FIG. 1, except that the spherical grinding wheel 47 and the peripheral grinding wheel 48 have an ATC (auto tool chain) means such as suction. And can be freely mounted on the spindle. Description of the other identical components will be omitted.

In the present embodiment, grinding is performed in the same manner as in the first embodiment, but two types of grinding wheels, a spherical grinding wheel 47 and a peripheral surface grinding wheel 48, are provided. Moved by the control device, and when performing spherical grinding, a spherical grinding wheel 47
After grinding is completed, the grinding wheel 47 for spherical surface grinding is mounted and removed, and the grinding wheel 48 for peripheral surface grinding is mounted to perform peripheral surface grinding.

The effect of this embodiment is that the exchange of the grindstones is free, so that even if there are various kinds of grindstones, it can be dealt with by increasing the grindstone storage unit. In addition, it is possible to process even a complicated shape, so that versatility is enhanced.

〔The invention's effect〕

According to the present invention, while the processing lens is mounted on the work axis, the spherical grinding of the lens, the peripheral side surface grinding and the chamfering can be continuously performed, so that one lens grinding machine and one grinding spindle are used, The apparatus is inexpensive, the manufacturing process can be simplified, and the number of steps can be greatly reduced.

[Brief description of the drawings]

1 to 6 show a first embodiment of the present invention. FIG. 1 is a plan view of the apparatus, FIG. 2 is an explanatory view when a convex surface is created, and FIG. 3 is a view when an outer peripheral plane is created. FIG. 4 is an explanatory view at the time of chamfer grinding, FIGS. 5 and 6 are explanatory views at the time of forming a concave surface, and FIGS. 7 to 9 show a second embodiment of the present invention. FIG. 10 is an explanatory view of curved surface grinding, peripheral side grinding and chamfering grinding, respectively. FIG. 10 is an explanatory view of a lens grinding machine showing a third embodiment of the present invention, and FIG. 11 is a lens showing a fourth embodiment of the present invention. 12 and 13 are explanatory views of a conventional lens grinder. DESCRIPTION OF SYMBOLS 1 ... Lens grinding machine 2 ... Processed lens 3 ... Work spindle 4 ... Lens holder 5 ... Adhesive 6 ... Grinding spindle 7 ... Wheel for spherical grinding 8 ... Wheel for circumferential surface grinding 9,10, 12 Control motor 11 Base 13 Control device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B24B 13/04

Claims (1)

(57) [Claims] 1. A step of holding a processing lens on a work spindle, a step of holding a grindstone disposed to face the processing lens on a grinding spindle, and setting the rotation axis of the grinding spindle to the rotation axis of the work spindle. Tilting the grinding spindle at a desired angle; moving the grinding spindle in a direction perpendicular to the rotation axis thereof; and moving at least one of the work spindle and the grinding spindle in the direction of the rotation axis. Contacting the tip end surface of the grindstone to the spherical surface of the processing lens, and making the rotation axes of the work spindle and the grinding spindle parallel to each other, and bringing the side surface of the grinding stone into contact with the processing lens to perform processing. Processing the peripheral surface of the lens; and making the rotation axes of the work spindle and the grinding spindle parallel to each other. A process in which a chamfered grinding portion of a grindstone is brought into contact with the engineered lens to chamfer the processed lens.