JPS58192742A - Lens grinding apparatus - Google Patents

Abstract

PURPOSE:To form an accurate and excellent lens, by grinding a lens, which is compressed to a grinding dish and a grinding holder, by rotating and moving the grinding dish, thereby performing the grinding at a stable state all the time. CONSTITUTION:A polishing dish 1 for a lens L, which has a spherical concave part, is screwed to a tip of a driving shaft 2 at the central part of a tubular box and rotated. The entire body of the tubular box is freely moved in a pendulum mode through a swing post 16, which is linked to a motor 9, and a swing cylinder 17, with a center shaft 12 at the upper part of a sleeve 11 as a center. A grinding holder 24 is attached to the tip of a holder shaft 20. The holder shaft 20 is compressed by a spring 23 through a holder arm 21. The lens L on the grinding dish 1 is compressed through a holder 24. When the grinding dish 1 is moved in the direction B from A, the lens L is pulled in the direction B, but the lens tends to go to the lower position and is contacted with the entire surface of the grinding dish 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lens grinding machine, and more particularly to a polishing apparatus for small and medium diameter precision silica lenses.

Lens polishing devices that have been commonly used can be roughly divided into two types, depending on whether the direction in which the holder shaft (hairpin) is inserted constantly pressurizes the silica stone in the polishing plate or not. The present invention belongs to the latter category, and is primarily a device for polishing a lens by shaking a silica stone in a polishing plate. In these conventional devices, there are two methods: one in which the center of the rocking movement is the silica stone of the grinding plate R and the polishing plate R, and the other in which the holder shaft is swung toward the silica stone. Since the lens is always unbalancedly pressurized, not only does the reproducibility of the lens R deteriorate, but the polishing plate wears out very quickly, so it is necessary to readjust the plate R frequently and change the swing angle and width. readjustment is required. Furthermore, although the latter poses no problem in the case of a concave lens, many problems arise when polishing a convex lens.

The present invention was developed to solve the above-mentioned drawbacks and problems, and includes a drive shaft with a spindle installed in the center of the cylindrical box, and a spherical recess at the tip of the drive shaft. A V-pulley is attached to the other end to rotate the polishing plate via a motor, and a center shaft is attached above the box to swing the entire box in a pendulum-like manner via a bearing. A holder shaft with a polishing holder connected thereto is fixed in the polishing plate rotating and swinging mechanism and in the upper part of the polishing plate, and a holder arm with a spring for pressurizing is attached to the holder shaft. B) and
By pressing the lens (L) between the polishing plate and the polishing holder of the cylindrical mechanism and polishing by rotating and rocking the polishing plate, the lens is always applied from the direction of the silica stone against the polishing plate at any angle. Furthermore, since the applied pressure is always a constant pressure, it is possible to provide a lens polishing device that can perform polishing in a stable state at all times and is capable of obtaining accurate and high-quality polished lenses.

Hereinafter, one implementation of the present invention will be described with reference to the drawings.

FIG. 1 is a book showing the lens polishing device of the present invention, which can be roughly divided into a polishing plate rotating and swinging mechanism (4) and a polishing holder fixing and pressing mechanism (B). The swing mechanism (4) has a drive shaft 2 with a spindle 3 installed in the center of the cylindrical box via a bearing 15.15, and a spherical recess at the upper end of the drive shaft 2. A lens (6) equipped with a polishing plate 1 for polishing is screwed on, an IIV pulley 4 is attached to the other end of the lower part, and a V pulley 5 is attached to the lens (6).
The rotation is normalized via the belt 7. ■Pulley 5
A drive shaft 6 that is linked to a #-t spindle motor 9
By the operation of this spindle motor 9, the rotation of the polishing plate L &t[E&6L-'(A91.E3.-71,.□ ・Bearings 15.15
The center shaft 12 is attached via the center shaft 12, and the entire cylindrical box in which the polishing plate rotating oscillator 111cA) is installed is oscillated in a pendulum shape via the swing boss 16 and the swing cylinder 17, which are linked to the spindle motor 9. It is free to move. That is, the polishing plate rotating and swinging mechanism (1) automates the rotational movement of the polishing plate and the swinging movement of the box. 8 is the sleeve loh sleeve base, 13 is the bearing case, 14 is the frame pace,
18Fi cylinder foot, 19 is the frame. Next, regarding the abrasive holder fixing and pressing mechanism (8), the abrasive holder 24 is attached to the tip of the holder shaft 20 attached to the holder arm 21 via the metal 22, and the spring 23 for pressurizing the holder arm 21 is fixed. Then, the holder shaft 20 is pressurized, and the lens (L), which is always placed on the polishing plate 1, is pressurized via the polishing holder 24. That is, the abrasive holder fixing and pressing mechanism ω) fixes the abrasive holder 24 and also performs 1! Pressure is applied to the silica stone in polishing plate 1 from a certain direction (vertical direction) and the lens (
This is a mechanism for piezoelectrically applying L) between the polishing plate 1 and the polishing holder 24. Note that 25 is an abrasive drain pit.

FIG. 2 shows the principle mechanism of the device of the present invention,
The principle of the mechanism will be explained in detail.

First, as shown in FIG. Therefore, if the lens (L) is placed in the center of the polishing IT which has a spherical recess and pressure is applied to the holder shaft 20 from the direction of the arrow, the polishing plate will be directed toward the silica stone of the polishing plate L via the polishing holder 24. Since the lens can is pressurized to 1, the lens can is placed under pressure between the polishing holder 24 and the polishing plate 1. Next, when the first spindle 3 is rotated in the direction of the arrow, the polishing plate 1 continues to rotate, so that the lens (L) is constantly polished between the polishing holder 24 and the polishing plate 1. 1 more polishing plate
If the cylindrical box combination that swings in the left and right arrow directions is oscillated horizontally in a pendulum shape, then the polishing plate 1 will swing in the arrow direction as shown in the figure, so the lens α, ) #'i- It can be polished freely even if it is fixed.

3 and 4 compare the mechanism of the present invention with the conventional mechanism shown in FIG. 2.

Figure 3 (A) shows a method in which the center of the rocking motion is the silica stone of the lens R and the polishing plate R, and if the total rocking width is '1A-B, then the holder shaft 20 and the lens color at the position A are the same. This is the case where the angle is θl and the angle at the position B is 02.

According to this method, since the pressing direction of the holder shirt 20 and the angle of the lens 20 change, the lens 20 is constantly pressed in an unbalanced manner. As a result, not only does the reproducibility of the lens R deteriorate, but the polishing plate L wears out very quickly, resulting in the disadvantage that it is necessary to frequently readjust the polishing plate IR and readjust the swing angle and width. Put it away.

In addition, in FIG. 3(o), it is fine if the lens (L) is at the position A', but if the holder shaft 24 is moved in the direction B, the lens (L) becomes a lens while being pressurized by the silica stone (P). At that time, the lens (6) moves in the opposite direction to gravity, and the lens (6) is slid on one surface of the polishing plate while being pried up with the silica stone as the center. Therefore, when polishing precision spherical lenses such as small-diameter lenses (φ15 or less), in addition to the above-mentioned drawbacks, it is also difficult to achieve accurate and high-quality polishing depending on the rotational speed of the polishing plate 1 and the quality of the polishing liquid. This has resulted in many unrepaired items, leaving many economic problems. On the other hand, according to the present invention, as shown in FIG.
The lens R) rotates and oscillates around the silica stone, and the holder shaft 20 is fixed vertically and pressurized.
It can be said that all of these drawbacks and problems have been resolved. In other words, when the lens (G) placed at a lower position on the polishing plate L is moved by an angle of θ from A to B, the lens (L) is pulled in the B direction. ,
Since the direction is opposite to the pressing direction and the polishing plate 1 is higher, the lens always tries to escape to the lower position, which is the initial position. That is, force the lens)
This is because the lens L) itself can be smoothly moved to a lower position on the polishing plate 1 without any force, without changing the position of the lenses a, , ) so that they hit the entire surface of the polishing plate 1. . This is because, as shown in FIG. 4(b), the oscillating motion of the polishing plate l is made into a linear motion at a constant speed via an air cylinder. For example, B - B' (
If an arm with a length of DD') is attached, its tip will make a linear motion of A/s/c/-σ-A'. The moving speed of each position at this time is from X to B>
\ gradually accelerates and reaches its peak at B', and from B' to C'
On the contrary, it is decelerated and becomes O at C'. Similarly, from C' it accelerates and reaches a maximum at σ, and from D' it decelerates from A' and reaches O at A'. Figure 4 (c) shows this relationship.
It is. This movement is performed by placing the lens (L) on the polishing plate 1.
If we look at the movement of , it becomes as shown in Figure 4). In other words, lens formation) stops at positions A' and C', and B
Since it moves at a very high speed near /, the polishing time is also short near B'. This phenomenon means that the degree of wear at the position B' of the polishing plate 1 is reduced. Note that FIG. 5 is an electrical circuit diagram of the device of the present invention.

Since the present invention is configured as described above, it has many advantages over the conventional system as follows.

(1) With conventional devices, it was necessary to constantly adjust the guideline while operating the device, but with this device, this is not necessary at all, and once the setup is complete, the device itself can make adjustments automatically.

(2) Fine adjustment is very simple and the operation is easy, so it can be operated without any skill.

(3) Since the processing speed during grinding can be increased, work efficiency can be increased.

(4) It is possible to improve the precision of the finished surface of the lens polishing, and it is also possible to obtain products of consistently high quality.

The present invention, which has many effects as described above, can be said to be an excellent lens polishing device from all aspects including performance, workability, economy, and practicality.

[Brief explanation of drawings]

Fig. 1 is an overall schematic explanatory diagram showing the lens polishing device of the present invention, Fig. 2 is a partially enlarged explanatory diagram showing its principle mechanism, Fig. 3 is an explanatory diagram of the mechanism according to the conventional method, and Fig. 4 is an explanatory diagram of the conventional system. A comparative diagram of the mechanism of the system and its explanatory diagram, and FIG. 5 is a drowsiness circuit diagram of the present device. 1. Polishing plate, 3. Spindle, 4.5... V pulley, 9... Spindle motor, 8.11... Sleeve, 12... Center sea shaft, 17... Swing cylinder, 20.・Holder shaft 21...
Holder arm, 23...Sfring, 24...Abrasive holder Patent applicant Makigae Seimitsu Agent Patent attorney Kiyoharu Karagi (a) Figure 3 (a) ([l) Figure 4 (a) ↓ A ＼ (b)

Claims (1)

[Claims] A drive shaft with a spindle is installed in the center of the cylindrical box. A polishing plate with a spherical recess is attached to the tip of the drive shaft, and a V-Gooley is attached to the other end for polishing via a motor. In addition to rotating the plate, the center/gift is attached to the upper part of the box using a polishing plate rotating and swinging mechanism that swings the entire box in a pendulum-like manner via bearings.
4) and an abrasive holder fixing and pressurizing mechanism (g)), in which a holder shaft with an abrasive holder connected thereto is fixed to the upper part of the abrasive plate, and a holder arm with a spring for pressurization is attached to the holder shaft. A lens polishing device characterized in that a lens surface is placed between a polishing plate and a polishing holder of both mechanisms, and the polishing plate is rotated and oscillated to perform polishing.