JPS6315102B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to improvements in lens polishing methods.

Conventional lens polishing involves placing a polishing plate or lens attachment plate over a rotating lens attachment plate or polishing plate.
It is carried out using a method in which the lens is pivoted with a so-called kanzashi, and the vertical relationship between the polishing plate and the lens, that is, whether the polishing plate or the lens attachment plate is polished while being pivoted with a kanzashi depends on the unevenness or curvature of the polished surface of the lens. Generally, when the polishing surface of a lens is a convex surface with a large curvature, polishing is performed with the lens attachment plate facing down, i.e., with the polishing plate supported by a bar. . In such a case, the outer diameter of the polishing plate cannot be made larger than the effective diameter of the lens attachment plate to which the lens is attached due to the supply of polishing liquid to the polishing surface. The polishing efficiency is lower than when the polishing plate is supported by a support plate, and it is also difficult to supply the polishing liquid to the polishing surface sufficiently evenly over the entire surface, making it easy for the polishing plate to wear unevenly and impairing the accuracy of the polishing surface. The problem is that it is difficult to maintain. In addition, with the lens polishing method described above, there is a problem that it takes a lot of effort and time to attach and detach the lens, not only when the lens attachment plate is placed downward. If you use it,
Another problem arises in that the device becomes significantly more complex.

The present invention provides a lens polishing method that solves the above-mentioned problems.The method of the present invention includes a polishing plate having a polishing surface of a predetermined curvature, and a polishing surface of the lens on the polishing surface of the polishing plate. A lens holding member that holds the lens so that the lens can be brought into contact with the lens, and a driven roller that is in contact with the lens holding member so as to press the lens against the polishing plate and that receives the outer periphery of the lens holding member at at least two places, and holds the lens. A support member that maintains the contact position of the lens held by the member with respect to the polishing plate at a position away from the center of the polishing surface of the polishing plate, and at least one of the polishing plate or the support member is moved around the center of the polishing surface of the polishing plate. The lens is rotated to polish the polished surface of the lens held by the lens holding member.

Hereinafter, the present invention will be explained based on the drawings.

Figures 1 to 3 are side views showing embodiments of the present invention, Figure 4 is a view taken along the line A-A in Figure 3, and Figures 1 and 2 are examples of convex polishing of lenses. , Fig. 3 shows an example of concave polishing of a lens, and Fig. 4 shows an example of concave polishing of a lens.
The figure shows the arrangement of the driven rollers of the support member.

In the figure, 1 is a polishing plate having a polishing surface 1a with a predetermined curvature, 2 is a shaft to which the polishing plate 1 is attached, and 3
5 is a lens holding member that holds the lens 4 so that the polished surface of the lens 4 can be brought into contact with the polished surface 1a of the polishing plate 1; and 5 is a contact that is in contact with the lens holding member 3 so as to press the lens 4 against the polishing plate 1. 5a and the outer periphery 3a of the lens holding member 3 at at least two places.
It is possible to change the inclination with respect to the position using an adjustment bolt 6 and fix it. The shaft 5c of the support member 5 shown in the first figure is oriented in a direction in which its center line passes through the center of the polishing surface 1a of the polishing plate 1, that is, in a direction that coincides with the center line of the mounting shaft 2 of the polishing plate 1.
In contrast, the bearing member 5 shown in FIGS. 2 and 3
The shaft 5c is integrally formed with the contact portion 5a that contacts the lens holding member 3 and the shafts of the driven rollers 5b and 5b', and the center line of the shaft 5c is offset from the center of the polishing surface 1a of the polishing plate 1. It faces in a direction perpendicular to the polished surface 1a.

Using such a device, the lens 4 is fitted onto the lens holding member 3 as shown in the figure, the polished surface of the lens 4 is brought into contact with the polished surface 1a of the polishing plate 1, and the supporting member 5 is used to hold the lens holding member 3. When the mounting shaft 2 of the polishing plate 1 is rotated while pushing the back surface, the polishing plate 1 also rotates, and the polishing surface of the lens 4 is polished by the polishing surface 1a of the polishing plate 1. That is, the polishing surface 1a of the polishing plate 1 tries to rotate the lens 4 together, but the rotation is caused by the outer periphery 3 of the lens holding member 3.
It is stopped by the driven rollers 5b, 5b' of the support member 5 which come into contact with a. Therefore, the polished surface 1a of the polishing plate 1 rubs against the polished surface of the lens 4. Since this sliding speed increases as the distance from the center of rotation increases, rotational torque is applied to the lens 4, and this torque pushes the lens holding member 3 by the contact portion 5a near the center of rotation of the lens 4, thereby holding the lens. Since the outer periphery 3a of the member 3 is supported by the driven rollers 5b and 5b' which are rotated by the supporting member 5, the lens 4 is not much reduced, so the lens 4 rotates together with the lens holding member 3, and the lens 4 is polished. is done uniformly. During polishing, it goes without saying that the abrasive liquid is supplied to the polishing surface, and in that case, if the abrasive liquid is supplied to the polishing surface 1a of the polishing plate 1 that is not in contact with the lens 4, the lens can be easily removed. 4 is supplied to the polishing surface.

In the above-described polishing method of the present invention, the lens 4 is attached to the polishing plate 1 via the lens holding member 3 by the supporting member 5.
Although the case has been described in which the lens 4 is brought into pressure contact with the polishing surface 1a of the polishing plate 1 and the polishing plate 1 is rotated, the present invention is not limited thereto, and it goes without saying that the lens 4 may be pushed from the polishing plate 1 side. , the polishing plate 1 is fixed and the support member 5 is attached to the polishing surface 1a of the polishing plate 1.
The polishing plate 1 and the supporting member 5 may be rotated together. In the example of FIG. 1, it is easy to rotate the support member 5 as described above. By rotating the support member 5, the polishing plate 1 and lens 4 as described above can be removed.
A sliding relative movement between the polishing surfaces occurs, and as a result, a rotational movement of the lens 4 and the lens holding member 3 also occurs, and uniform polishing similar to when the polishing plate 1 is rotated is performed. The contact between the support member 5 and the lens holding member 3 for pressing is performed by point contact as close to the center of rotation as possible so that the support member 5 provides little resistance to the rotation of the lens 4, that is, the lens holding member 3. It is preferable that the rotation center is determined by the diameter of the outer periphery 3a of the lens holding member 3 and the contact position of the driven rollers 5b, 5b' of the support member 5 that receives it, so that it coincides with the contact position for the above-mentioned pressing. This is quite difficult, and therefore,
For example, as shown in the figure, the contact portion for pressing is configured such that a ball 7 is rotatably embedded in the lens holding member 3, and the ball 7 is brought into contact with the flat contact portion 5a of the support member 5. is most preferred.
Of course, the ball 7 may be buried not only on the lens holding member 3 side but also on the supporting member 5 side.
Further, the outer periphery 3a of the lens holding member 3, which is in contact with the driven rollers 5b, 5b' of the support member 5, receives a force from the driven rollers 5b, 5b' in a direction that brings the lens 4 into pressure contact with the polishing plate 1. It is preferable to have a tapered surface that opens toward the polishing plate 1 side. As a result, the stability of the contact between the lens 4 and the polishing plate 1 can be further improved.

According to the present invention, as described above, the lens can be easily attached and detached, the polishing efficiency is high, the supply of polishing liquid is easy and uniform, and the polished surface is not unevenly worn. You can get the same effect.

[Brief explanation of the drawing]

1 to 3 are side views showing embodiments of the present invention, and FIG. 4 is a view taken along the line A--A in FIG. 3. DESCRIPTION OF SYMBOLS 1... Polishing plate, 1a... Polishing surface, 3... Lens holding member, 3a... Outer periphery, 4... Lens, 5...
Supporting member, 5a... contact portion, 5b, 5b'... driven roller.

Claims (1)

[Claims] 1. A polishing plate having a polishing surface of a predetermined curvature, a lens holding member that holds the lens so that the polished surface of the lens can be brought into contact with the polishing surface of the polishing plate, and a lens holding member that holds the lens so as to press the lens against the polishing plate. The lens has driven rollers that are in contact with the member and receive the outer periphery of the lens holding member at at least two places, and maintain the contact position of the lens held by the lens holding member with respect to the polishing plate at a position away from the center of the polishing surface of the polishing plate. Lens polishing characterized by rotating at least one of the polishing plate or the support member around the center of the polishing surface of the polishing plate to polish the polishing surface of the lens held by the lens holding member. Method.