JPH0665461B2 - Optical lens, mirror and other spherical surface processing equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a spherical surface processing apparatus that performs surface grinding and surface polishing on a spherical surface of an optical lens, a mirror or the like.

[Prior Art] Conventionally, in the spherical processing of optical lenses and mirrors, the surface of the lens material is first created by a spherical roughing machine, a so-called grinding device, and then the created lens / mirror material is polished by a polishing device. It is done by lapping. As shown in FIG. 5, this grinding apparatus holds a lens / mirror material b on a rotating grinding holder a,
The mirror material b is ground by a diamond tool d attached to the tip of the cup-shaped wheel c. This inspection device can be used for various purposes such as convex surface, concave surface and flat surface with one unit, and its accuracy does not require high accuracy because it is a pre-process, and it is a synthetic spherical shape of lens / mirror curved surface and cup-shaped wheel. This grinding device is generally used because it can be processed by.

[Problems to be solved by the invention]

However, in the above-mentioned grinding device, the setup for obtaining the synthetic spherical shape is complicated, and since the cutting edge portion of the diamond tool of the cup-shaped wheel is strip-shaped, line grinding is performed, and a high-quality finished surface like surface grinding is obtained. This is a serious problem in the lens lapping process in which the accuracy in the previous process has a great influence on the stability in the subsequent process.

The present invention has been made in view of the above circumstances, and is a spherical surface that can be used for various purposes such as a convex surface, a concave surface, and a flat surface with one unit, and can easily perform surface grinding while maintaining high accuracy. An object is to provide a processing device.

[Means for solving problems]

In order to solve the above problems, the optical lens / mirror spherical surface processing apparatus of the present invention rotates and swings the lower shaft 12 of the polishing dish 10 so that the workpiece 1 such as the optical lens / mirror is placed on the polishing dish 10. On the other hand, in a spherical surface machining device for spherically machining the workpiece 1 by pressing on the spherical core axis, a reference cam 24 having a curved cam profile 24a is replaceably attached to the side of the polishing dish 10. A movable base 22 for holding the lower shaft 12 of the polishing dish 10 is movably provided on the cam profile 24a of the reference cam 24, and the lower shaft 12 of the polishing dish 10 is movably attached to the movable base 22. The trace of the spherical axis of the lower shaft 12 of the polishing dish 10 is made variable so that the workpiece 1 can be freely spherically processed.

[Work]

According to the above configuration, it is possible to attach a reference cam having a cam profile according to the purpose of spherical processing, and to move and attach the lower shaft of the polishing dish in the axial direction according to the purpose of spherical processing. , The spherical rocking locus of the lower shaft of the polishing dish can be freely changed, and the surface of the spherical surface can be freely processed by any object such as an optical lens or mirror.

〔Example〕

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4.

FIG. 1 is a perspective view in which a part of a spherical surface processing device such as an optical lens / mirror of the present invention is cut away, and FIG. 2 is a sectional view in which a part of the spherical surface processing device is cut out. Reference numeral 1 denotes a workpiece such as a lens and a mirror, which is fixedly held by a chuck 2. The chuck 2 is fixed to the lower end of an upper shaft 3, the upper shaft 3 is rotatably supported by an arm base 4 via an upper holder 5, and a pulley 6 is fixed to the upper end of the upper shaft 3. A motor 7 is fixed to the arm base 4, and a pulley 8 is fixed to a drive shaft of the motor 7. Therefore, the upper shaft 3 is rotated at a low speed (for example, 60 rpm) by the motor 7 via the belt 9 wound around the pulleys 6 and 8. Since the upper shaft 3 is moved up and down in the axial direction by the arm base 4, the lens 1 fixedly held by the chuck 2 can also be moved up and down in the axial direction.

Diamond pets (300 #) 11 are attached to the polishing dish 10 at regular intervals. The polishing dish 10 is fixed to the upper end of a lower shaft 12 which is a spindle. This lower shaft
The lower holder 12 is axially supported by the lower holder 13 via bearings 14, 14. A pulley 15 is fixed to the lower end of the lower shaft 12, and a motor 17 is attached to a blanket 16 drilled from the lower holder 13.
Is fixed, and the pulley 18 is fixed to the drive shaft of the motor 17. Therefore, the lower shaft 12 is rotated at a high speed by the motor 17 via the belt 19 wound around the pulleys 15 and 18 (for example, 30
00r.pm).

The lower holder 13 is held in the rocking body 20 having a bowl-shaped cross section, and the lower holder 13 is set in the rocking body 20 with a set bolt.
21 makes it possible to fix it at any position in the axial direction. A cylinder 20a is fixed to the oscillating body 20 to form a movable base 22, and cam floors 23 are attached to both ends of the cylinder 22 in the axial direction. The cam floor 23 is movably mounted on a reference cam 24, and the reference cam 24 is screwably mounted on a frame body (not shown). The profile of this reference cam 24
24a can be convex, concave, flat, etc.,
Also, the radius of curvature of the cam profile 24a of this reference 24,
For example, it is made every 100 mm, and the axial movement range of the lower shaft 12 is above and below the reference position of the reference cam 24, for example, 50 mm.
If it is mm, the surface of the workpiece 1 as a lens / mirror material to be ground or polished can be adapted to any R (R).

The rocking motion of the rocking body 20 is performed by rotating the pinion 25 forward and backward by a pinion 25 fixed to the lower part of the rocking body 20 and a rack 26 fixed to the frame body side.

The amount of diamond wear during grinding of the work piece 1 is dealt with by slightly raising the lower shaft 12 by a jet of a jet 27 through an air cylinder (not shown) by counting the number.

Next, the operation of the spherical lens / mirror or other spherical surface processing apparatus having the above-described configuration will be described.

First, set the workpiece 1 to be polished on the chuck 2,
A diamond pet (for example, 300 #) 11 that can obtain a polished surface that is necessary and sufficient is selected and attached to the polishing dish 10. Next, since the R of the workpiece 1 to be ground or polished is fixed, the reference cam 24 is set in accordance with this R. The reference cam 24 is made, for example, every 100 mm, and the polishing dish 10 swings on the cam profile 24a of the reference cam by the support of the cam floor 23. Therefore, the setting of R of the reference cam 24 is as follows. In the case of a convex cam, as shown in FIG. 3, the center points x of the cam floors 23, 23
The half position between and is set to 0, and ▲ ▼ and ▲
When the distances of ▼ are A, the center point of R of the reference cam 24 is P, the distance of ▼ is B, and the diameters of the cam floors 23 and 23 are c, the R of the reference cam 24 to be obtained is ) Becomes the formula.

Convex reference cam Since A, B, and C are known numbers, R is also determined.

In addition, as shown in FIG. 4, the cam for concave surface is used for the cam floor.
The half position between the center points x and y of 23, 23 is set to 0, and ▲
If the distances of ▼ and ▲ ▼ are A, the center point of R of the reference cam 24 is P, the distance of ▲ ▼ is B, and the diameters of the cam floors 23 and 23 are C, the R of the reference cam 24 to be calculated is as follows. (2) is obtained.

Concave reference cam Therefore, R of the reference cam 24 is 100 mm, 200
Assuming that the convex reference cam R of formula (1) is calculated to be 140 mm, the reference cam 24 of 100 mm is selected according to the R.
When R of the convex reference cam of the formula (1) is calculated to be 70 mm, 100 mm and the reference cam 24 are selected according to the R. still,
The concave reference cam R of the formula (2) is also selected similarly.

Next, the lower shaft 12 is moved up and down within a range of 50 mm with reference to the above-mentioned 0 point, that is, the origin in accordance with the R of the workpiece 1 to be ground or polished, and the lower shaft 12 is moved at a required position. It is fixed to the oscillator 20 via a lower holder 13.

After the above adjustment, the lower shaft 12 is rotated at high speed by the motor 17, the swinging body 20 is rotated forward and backward on the rack 26 to rotate the pinion 25, and the upper shaft 3 is rotated at low speed by the motor 7. At the same time, press the arm base 4 downward,
The workpiece 1 is ground or polished by the diamond pet 11 of the polishing dish 10.

[Effects of the Invention] As described in detail above, in the spherical lens processing apparatus for optical lenses, mirrors, etc. of the present invention, a reference cam having a curved cam profile is attached to the side of the polishing dish in a replaceable manner, and the reference cam is attached. Since a movable base for holding the lower shaft of the polishing dish is movably provided on the cam profile of and the lower shaft of the polishing dish can be moved in the axial direction on the movable base, the spherical center of the lower shaft of the polishing dish is provided. The swinging locus can be changed, and the spherical surface can be machined into a spherical surface that requires a workpiece such as an optical lens and a mirror. Therefore, select the required cam out of cams with various curved cam profiles, and
Since it is possible to perform spherical surface processing on a spherical surface that requires a work piece by setting the lower shaft of the polishing dish to a required position, it is possible to use it for any application such as a convex surface, a concave surface and a flat surface with one device. Also, the operation of setting the required spherical surface is easy, and because it is surface grinding, the processing time can be greatly shortened compared to the conventional machine, and a highly accurate finished surface can be obtained. Further, if the lens chuck method is changed so that the lens mounting portion has a degree of freedom, it can be used as surface polishing.

[Brief description of drawings]

1 to 4 show one embodiment of the present invention. FIG. 1 is a perspective view in which a part of a spherical surface processing apparatus for optical lenses, mirrors, etc. of the present invention is cut away, and FIG. FIG. 3 is a sectional view in which a part of the device is cut away, FIG. 3 is an explanatory view of a calculation method of a reference cam on a convex surface, FIG. 4 is an explanatory view similar to FIG. 3 on a concave surface, and FIG. It is a principal part explanatory drawing of an apparatus. 1 …… Workpiece 10 …… Grinding dish 12 …… Lower shaft 22 …… Movable base, 24 …… Reference cam 24a …… Cam profile

Claims (1)

[Claims] 1. A lower shaft 12 of a polishing dish 10 is rotated and oscillated, and a workpiece 1 such as an optical lens and a mirror is pressed against a polishing dish 10 on a spherical core axis so that the workpiece 1 is spherical. In the spherical processing device for processing, a cam profile 24 is provided on the side of the polishing dish 10.
A reference cam 24 having a curved surface is replaceably attached, and a movable base 22 for holding the lower shaft 12 of the polishing dish 10 is movably provided on the cam profile 24a of the reference cam 24, and the movable base 22 is movable. The lower shaft 12 of the polishing dish 10 is attached to 22 so as to be movable in the axial direction, and the trace of the spherical axis of the lower shaft 12 of the polishing dish 10 is made variable so that the workpiece 1 can be freely spherically machined. A spherical surface processing device for optical lenses, mirrors, etc.