JP2882089B2 - Lens polishing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens polishing apparatus for forming an optical lens used in a projection television or the like on a mirror surface with high precision.

[0002]

2. Description of the Related Art In recent years, the need for a large screen has been increased, and the demand for a projection television for obtaining a large screen by enlarging and projecting an image of a cathode ray tube (CRT) onto a screen using a projection lens has been rapidly increasing. Conventionally, the projection lens has been an all-glass lens, but recently, a hybrid lens combining a plastic lens and a glass lens has become mainstream. There are two types of plastic lens manufacturing methods, molding method and cutting method. Molding method is the mainstream from the viewpoint of cost. However, lenses that require high performance and high precision, such as high-definition television lenses, are cut method. It is made. The cut lens has been processed into a desired lens surface shape by a precision processing machine such as an ultra-precision CNC lathe, and then mirror-polished by a lens polishing machine or a skilled worker to finish.

Hereinafter, an example of a conventional lens polishing apparatus will be described with reference to the drawings. FIGS. 3 and 4 show the configuration of a conventional lens polishing apparatus. In the figure, reference numeral 1 denotes a head drive unit which makes a linear motion in the radial direction, 2 denotes a slider attached to the head drive unit 1 and slides up and down along the irregularities of the lens surface shape, and 3 denotes a pad attached to the slider 2. Shaft rotation motor, 4 is a rotation transmission bearing,
Reference numeral 5 denotes an eccentric rotation shaft that converts the rotation of the pad shaft rotation motor 3 into eccentric motion and transmits the eccentric motion to the pad 6. The pad 6 is swingably supported by the eccentric rotary shaft 5. 10 is a lens 7
And a holder 12 rotated by a holder rotation motor 11, a polishing liquid supply jig 12 for supplying the polishing liquid blown out of the lens 7 to the pad 6 by the rotation of the holder 10, and 13 a pad 6 and a polishing cloth 14. It is a rubber cushion that absorbs shock and vibration.

The operation of the lens polishing apparatus configured as described above will be described below with reference to FIGS.

[0005] The lens 7 is mounted on a holder 10 and a polishing liquid is supplied to the holder 10. When the holder rotating motor 11 is operated and the holder 10 and the lens 7 rotate, the polishing liquid flowing outward due to the centrifugal force hits the polishing liquid supply jig 12 and is blown toward the center of the lens 7, and the polishing cloth at the tip of the pad 6 14. The pad 6 vertically and oscillates along the unevenness of the lens surface shape by the slider 2 and the eccentric rotation shaft 5, and is always kept in close contact with the lens 7. When the pad shaft rotation motor 3 is operated, the pad 6 performs eccentric rotation by the eccentric rotation shaft 5 and performs radial linear motion from the center of the lens 7 to the periphery and from the periphery to the center by the head driving unit 1. The lens 7 is polished with a polishing cloth 14 and a polishing liquid several times to finish the lens 7 to a mirror surface.

[0006]

However, in the above-described structure, the polishing liquid supplied to the pad by the polishing liquid supply jig flows down at the portion where the curvature of the lens shape is large, so that the polishing liquid is sufficiently supplied to the polishing pad. Is not supplied, and there is a problem that the surface is not polished and the cut is not completely removed and the surface does not have an appropriate surface roughness.

The present invention has been made in view of the above problems, and provides a lens polishing apparatus having a simple structure that realizes improvement of lens surface accuracy and surface roughness by automatic polishing, and shortens polishing time.

[0008]

In order to solve the above-mentioned problems, a lens polishing apparatus according to the present invention is provided with a plurality of radially radiating pads on a pad for polishing a lens so that a polishing liquid is always secured on the pad. Fins are provided.

[0009]

According to the present invention, the polishing liquid is wrapped around the roots of the fins provided on the outer periphery of the pad to constantly secure the polishing liquid on the polishing cloth, thereby enabling the mirror finish of the lens by automatic polishing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lens polishing apparatus according to one embodiment of the present invention will be described below with reference to the drawings. (FIGS. 1 and 2)
1 shows a configuration of a lens polishing apparatus according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a head drive unit which makes a linear motion in the radial direction, 2 denotes a slider attached to the head drive unit 1 and slides up and down along the irregularities of the lens surface shape, and 3 denotes a pad attached to the slider 2. The shaft rotation motor, 4 is a rotation transmission bearing, and 5 is an eccentric rotation shaft for converting the rotation of the pad shaft rotation motor 3 into eccentric motion and transmitting the eccentric motion to the finned pad 6. The finned pad 6 is provided with four rubber fins 8 at the outer periphery in a radial manner and is swingably attached to the eccentric rotary shaft 5. Reference numeral 10 denotes a holder that holds the lens 7 and is rotated by a holder rotation motor 11. Reference numeral 12 denotes a polishing liquid supply jig that supplies the polishing liquid blown to the outside of the lens 7 by rotation of the holder 10 to the pad 6. And a cushioning rubber between the polishing pad 14 and the pad to absorb shock and vibration.

The operation of the lens polishing apparatus configured as described above will be described below with reference to FIGS.

The lens 7 is mounted on the holder 10 and a polishing liquid is supplied to the holder 10. When the holder rotation motor 11 is operated and the holder 10 and the lens 7 rotate, the polishing liquid flowing outward due to the centrifugal force hits the polishing liquid supply jig 12 and is blown toward the center of the lens 7, and the tip of the tip 6 of the finned pad 6 is removed. It is supplied to the polishing cloth 14. The finned pad 6 moves up and down and swings along the unevenness of the lens surface shape by the slider 2 and the eccentric rotation shaft 5, and is always held in close contact with the lens 7. When the pad shaft rotating motor 3 is operated, the finned pad 6 rotates eccentrically by the eccentric rotating shaft 5, and the polishing liquid is wound around the root of the fin 8 provided on the outer periphery, so that the polishing liquid is always secured on the polishing cloth 14. Meanwhile, from the center of the lens 7 to the periphery, and from the periphery to the center, the head driving unit 1 repeats the linear movement in the radial direction one to several times, and performs polishing with the polishing cloth 14 and the polishing liquid to finish the lens 7 to a mirror surface. .

As described above, according to this embodiment, the pat 6
By providing a plurality of fins 8 on the outer periphery of the pad 6, the polishing liquid in the holder 10 is further agitated as the pad 6 rotates, and the polishing liquid is secured at the base of the fin on the outer periphery of the pad 6, so that the polishing cloth 14 is always polished. Even if the liquid is supplied and the lens shape has a large curvature, polishing with a well-stirred polishing liquid realizes the proper shape and surface roughness, and enables mirror polishing of the lens by automatic polishing. I do.

[0014]

As described above, according to the present invention, the holder that rotates while holding the lens and the pad for polishing the lens are held in close contact with the lens surface, and the pad is given rotational movement and linear movement in the radial direction. Having a driving unit and a polishing liquid supply unit for supplying a polishing liquid to the pad, and by providing a plurality of fins radially on the outer periphery of the pad, the polishing liquid is always secured at the root of the fin on the outer periphery of the pad. Even if the polishing liquid is supplied to the polishing cloth and the lens shape has a large curvature, by polishing with a sufficiently stirred polishing liquid, the appropriate shape and surface roughness are realized, and the lens is automatically polished. Enables mirror finishing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lens polishing apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of a pad portion of the lens polishing apparatus according to the embodiment.

FIG. 3 is a perspective view of a conventional lens polishing apparatus.

FIG. 4 is a perspective view of a pad portion of a conventional lens polishing apparatus.

[EXPLANATION OF SYMBOLS] 1 head driving section 2 slider 3 pad shaft rotating motor 4 rotation transmission shaft 5 eccentrically rotating shaft 6 pads 7 lens 8 fins 10 holder 11 holder rotation motor 12 polishing liquid supply jig 13 rubber buffer 14 polishing cloth

Claims (1)

(57) [Claims] 1. A holder and pad and, a driving unit for imparting linear motion of rotary motion and radial to the pad with tightly held the pad to the lens surface to polish the lens the lens retain the imparting rotary motion When, and a polishing liquid supply unit for supplying a polishing liquid to the pad, the outer periphery of the pad
Parallel to the rotation axis of the pad on the surface, and a plurality of rubber radially
The beam fins, a lens polishing apparatus, characterized by further providing the polishing pad via the cushioning rubber on the bottom.