JPS58202855A - Curvature radius indexing apparatus for polishing lens - Google Patents

Abstract

PURPOSE:To obtain a surface to be polished without variation in the quality by arranging a rotary table retained on an oscillation arm, an oscillation strut grasping a lens with the rotary table, a mobile table having this oscillation strut erected thereon and the like. CONSTITUTION:A rotary table 2 supported with a shaft in a tank 1 is rotated at a high speed through a flexible shaft 22 with a drive motor 21. A base 3 is incorporated in a frame body 20 successively arranged on the side wall of the tank 1 in such a manner as to slide vertically, a mobile table 5 mounted on a bearing 4 erected on the top thereof and an oscillation strut 6 formed integral thereon 5. With such an arrangement, the curvature of the lens can be indexed simply with the shifting of the flucrum of a pin oscillation mechanism thereby providing a surface to be polished without variation in the quality.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for determining a radius of curvature in lens polishing for polishing a lens used for a camera or the like into a concave groove shape or a zero-curve shape, and an apparatus therefor.

Conventional lens polishing equipment uses a polishing surface formed on a polishing plate to match the lens curvature, so it requires a high degree of skill to supply highly accurate lenses with these machines. Efficiency was also inevitably poor. In other words, the finished state of the polishing surface of the polishing plate directly affects the precision of the lens, so it takes time and effort to manufacture it.
In addition, the polishing plate was subject to severe wear and could not withstand long-term use, and the polishing plate had to be repaired frequently.

The curvature radius indexing device for lens polishing of the present invention makes it possible to freely adjust the curvature of the lens by moving the fulcrum (rotation center) of the arm that holds the pin in the axial direction of the surface to be polished. It is an object of the present invention to provide a curvature radius indexing device for lens polishing in which both the tip of the pin and the surface of the rotary table perform rocking motion according to the curvature of the lens.

That is, the curvature radius indexing device for lens polishing of the present invention includes a rotary table held by a swinging arm, a pin that holds the lens between the rotary table, an arm that holds the pin, and an arm that is slidable. a swinging support that guides the
It has a movable table on which the swinging column is erected, a height adjustment mechanism coupled to the arm and the swinging arm, and a swinging mechanism attached to the swinging column and the swinging arm, This device is characterized in that the shaft of the movable table is used as the fulcrum of the neck twisting mechanism.

, 1st adventure Embodiments of the present invention will be described below based on the drawings.

The rotary table, which is pivotally supported inside the tank, is driven by a drive motor,
2/ allows it to rotate at high speed via a flexible shaft, , 22. A frame body connected to the side wall of the other tank/, 20
A base 3 is built into the base 3 so as to be slidable up and down, a movable table J is pivotally attached to a bearing q set upright on the top of the base 3, and a swinging support B is integrally formed on this movable table J. ing.

An arm 7 is attached to the swinging column B so as to be able to slide up and down, and a pin 8 is held at the tip of the arm 7.

A main shaft that is inserted into the bearing and pivotally supports the movable table?
A rocking rail 10 is installed on the front side of the base 3 with a gear // sandwiched between them. Further, on the front surface of the base 3, a second adjustment post /l whose outer periphery is threaded is screwed along the swing support column B and the swing rail 10.

Further, a horizontal shaft /3 is installed at the bottom of the movable table J, and a bevel gear /3 is installed on the second adjustment post / - outer periphery.
A bevel gear/, 5 attached to the end of this horizontal shaft/3 is engaged with lI. The other end of the horizontal shaft /3 protrudes from the rear surface of the movable table 6, and the bevel gear /B attached to its tip 11 is connected to the first adjustment post L? connected to the vertical motor /8. The upper bevel gear /7 engages and rotates.

1st adjustment boss/? is screwed onto a support rod O projecting horizontally from the frame body O so as to be able to move up and down, and the base 3 is moved up and down by its rotation.

, 23 is a swing arm that supports the rotary table and slides up and down within the swing rail 10 as the second adjustment post rotates. That is, the first
According to the rotation of the bevel gear /7 on the adjustment post 19, the second adjustment post /- rotates via the bevel gear /lLt, and the second adjustment post /7 rotates.
The adjustment posts /, 2 move the arm 7 and the swing arm 23 upward or downward in synchronism.

a holding arm extendably attached to the tip of the arm 7;
, 27 is fixed to the other end of the bottle fixing portion 8, into which the pin 8 is inserted and fixed. Further, the front end of a piston 30 of an air cylinder 19 which is pivotally supported by the arm 8 is pivotally attached to the upper part of the pin fixing part 28, and the pin 8 can be pressurized by air pressure via the pin fixing part 28. 33
is a near compressor, and 34 is an air hose.

Between the pin 8 and the rotary table, 3/ is a lens holder, and 3 and 2 are polishing plates, which are held either on the rotary table or on the pin 8, respectively.

On the movable table 5, a link lever lI/ whose length can be adjusted at right angles to the axial direction of the main shaft is attached to the movable table 5 using a vertical rail lIO, and the other end of the link lever II/ is a frame body, and a rotary disk lI pivoted on 20
, 2. II3 is a stroke adjustment hole drilled in the front surface of the rotary disk II, into which a sliding member for pivotally supporting the link lever q/ is inserted. This rotary plate 1 rotates a chain gear l/l, 5 coaxially attached by a variable speed motor 4/7 via a chain +4, and in conjunction with this, a link lever l1tl swings the movable table 5. Both the support column B and the support column B are oscillated using the bearing D as a fulcrum. To adjust this swinging motion, the amplitude is adjusted by the stroke adjustment hole l.
By moving the sliding body in the radial direction inside the IJ, the start and end points of one swing can be adjusted using the link lever l.
This is done by adjusting the I/length.

On the other hand, the swinging rail IO of Furi Chiaki installed on the front side of the base 3 with the gear ll in between is the main axis on the rear side of the movable table j? Is the gear 5/ fixed to rotate above the main shaft? Connecting shaft J installed on the lower side, 2 gears at both ends, 53
5,5II by rotating said gear l/. The fulcrum of the oscillating mechanism located at the bearing 1 moves relative to the polishing surface as the base J moves up or down in conjunction with the second adjustment post. The lens to be polished at this time is, for example, if the polishing plates J, 2 are set on the rotary table d and the lens holder 31 is set on the pin 8 side according to the above drawing, the relative position of the fulcrum to the lens polishing surface is When it is located at a lower position, it is polished in a concave groove shape, and when it is located at an upper position, it is polished in a convex groove shape. In this case, adjusting the curvature of the lens was conventionally done by a skilled worker by forming a precisely finished polishing surface on a polishing plate with the opposite shape to the curved surface of the lens, and then adjusting this. On the other hand, in the present invention, the polishing can be performed quickly and accurately by manipulating the position of the fulcrum of the swinging mechanism with respect to the lens polishing surface sandwiched between the pin 8 and the rotary table.

That is, the pin 8 itself supported on the holding arm 27,
And the rotary table 5 swings in an arc corresponding to the curvature of the lens. The stroke range of the swinging motion is determined by inserting the sliding body attached to the link lever into the stroke adjustment hole tLtJ formed in the rotary disk.
It can be determined by mounting while adjusting the distance from the center of the lenses 1t, 2, and the mounting position is adjusted depending on the size of the lens.

In this way, when the position of the fulcrum of the swinging mechanism with respect to the lens polishing surface and the range (angle) of its swinging movement are determined, the air cylinder 2 is connected to the pin 8. Activate "1"
Then, while applying a predetermined pressure downward with the piston 3o, the drive motor J/ is operated to rotate the rotary table at high speed. At this time, the variable speed motor 7 is operated to swing the arm 7 and the holding arm 2 at a predetermined radius of curvature, and the swing rail IO and the swing arm 3 are interlocked therewith. The position of the above-mentioned fulcrum is determined by operating the vertical (deceleration) motor /8 and supporting rod protruding from the frame body -〇, the first adjustment post /? supported by the support rod 2.5. Adjustment is made by rotating the arm 7 and lifting the rotary table 6. When the swinging post B swings 6' from this fulcrum, the first adjustment post/? ,
The second adjustment post/2 is also bent at the 1.57th part of the universal joint 6 and undergoes a similar swinging motion.

The axis of each universal joint is also located at the same position as the fulcrum.

Swinging arm, swinging movement on 23 side is geared //, 5/,
, 53 and 5 da can be adjusted by changing the diameters.

In the present invention, the swing mechanism is configured to be driven from the pin 8 side, but it may be configured to be driven from the rotary table d side, or may be configured to be driven separately.

By adopting the above configuration, the present invention first determines the curvature of the lens polishing surface, and then moves the movable table 6 to a height corresponding to the radius of curvature of the first adjustment post/? While rotating the base 3 and moving the base 3, the fulcrum is stopped at a predetermined position by reading the scale of a ruler attached to the frame 20. Thereafter, the length of the link lever and the position of the slider in the stroke adjustment hole 3 are determined to determine the stroke range of the swinging motion, and the lens is set in the (In tool 3).

Next, while rotating the rotary table at high speed, the rotary plate Il, 2 is adjusted to a predetermined speed by the variable speed motor tI7 and rotated, and the link lever roof arm? and holding arm-2
The pin 8 is oscillated through 7, the swing arm is oscillated, and the rotary table is oscillated through 2J at a predetermined stroke.
Polish the lens to the desired curvature. Of course, the polishing dish 3- is constantly supplied with polishing agent from a supply pipe or the like, and the lens is efficiently polished. Also, pin 8 is an air cylinder during polishing work, 2? A downward force is constantly applied to ensure more efficient polishing. Of course, it is also possible to further press the rotating table d upward.

The above rotary table or rotary disk I/l? It is desirable to incorporate a timer so that the operation can be stopped automatically.

Since the present invention is constructed as described above, the curvature of the lens can be easily determined by moving the fulcrum of the pin swing mechanism, and a surface to be polished with consistent quality can be obtained. Alternatively, the pin 8 whose tip is engaged in the center of the polishing plate is always oscillated with its tip facing the spherical center of the lens,
Furthermore, since a load is applied in the axial direction of this pin 8 by an air cylinder tip, the load applied to the entire lens polishing surface is applied to each piece, and the quality of the resulting lens is maintained without eccentricity (very stable over a long period of time). It was a good one.

What's more, the wear of the polishing plate is uniform across all parts, greatly improving durability.

In particular, it is a surprising and extremely remarkable effect that once the curvature ml of the lens is determined, the unevenness of the surface of the polishing surface and the radius of curvature of the polishing plate do not require very precise accuracy.

[Brief explanation of the drawing]

FIG. 1 is an elevation view showing an embodiment of the curvature radius indexing device for lens polishing of the present invention, and FIG. 2 is an enlarged view of the main parts thereof. 1010 rotary table 6.9. Movable table Otsu 00
．． Swing column 7...Arm 8...Pin
? ...Main shaft 1.2. 2nd adjustment post /? , first adjustment post, 23. Swing arm guar, deceleration motor knee everyone

Claims (1)

[Claims] 1. A rotary table held by a swing arm, and a pin that clamps a lens between the rotary table. An arm for holding a pin, a swinging post for slidably guiding the arm, a movable table on which the swinging post is erected, and a height adjustment mechanism for the arm and a fulcrum connected to the swinging arm. A radius of curvature indexing device for lens polishing, comprising: a swinging mechanism attached to the swinging column and swinging arm, the main axis of the movable table serving as a fulcrum of the swinging mechanism. 2. The fulcrum height adjustment mechanism is rotatably driven by a deceleration motor and rotates in conjunction with a first adjustment post that is held movably up and down on the frame and supports the base;
The curvature radius indexing device for lens polishing according to claim 1, comprising a second adjustment post for raising and lowering the arm and the swing arm in the same direction along the swing support and the swing rail.