JPH0768457A - Work supporting device of optical element polishing machine - Google Patents

Abstract

PURPOSE:To provide a work supporting device of an optical element polishing machine which can polish a small diameter lens by a work supporting structure with small rotational resistance, and improve the surface precision of the surface to be polished by shutting off the generation and transmission of the vibration at a bearing part. CONSTITUTION:A work supporting device of an optical element polishing machine consists of a first swaying member 10 which sways around the first axis X, a second swaying member 20 mounted on the first swaying member 10 so as to sway around the second axis Y, and a work supporting shaft 30 supported by the second swaying member 20 through a hydrostatic bearing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work supporting device of an optical element polishing machine for supporting a work such as a glass lens in the optical element polishing machine.

[0002]

2. Description of the Related Art Conventionally, polishing work of an optical element has been performed by an apparatus as shown in FIG. In the figure, 1 is a polishing dish, 2 is a lens with the surface to be polished facing down, 3 is a lens-attaching dish, and 4 is a kanzashi that supports the attaching dish 3 via swivel balls 4a so that it can swivel freely. In the apparatus, the lens 2 was polished by swinging the hammer 4 while rotating the polishing dish 1. However, with this device,
Polishing angle θ (when one point on the outer circumference of the lens 2 is P, the tangent line at the point P is PN, and the spherical center of the sphere 4a is Q,
= ∠PQN is called a polishing angle. ) Is sufficiently small, the polishing can be performed stably, but as shown in FIG. 7, when the curvature of the lens 2 becomes large, the polishing angle θ becomes large, so that the lens 2 is not driven to rotate and polishing becomes impossible. there were.

In order to solve such a problem, the applicant of the present invention has proposed a work supporting device of an optical element polishing machine in which the polishing angle can be freely set in Japanese Patent Laid-Open No. 63-11486. As shown in FIG. 1, this device includes a first swing member 10 that swings about a first axis X,
A second swing member 20 attached to the first swing member 10 so as to swing about a second axis Y orthogonal to the first axis X, the first axis X, and the second swing member 20. A work support shaft 30 supported by the second rocking member 20 so as to rotate about a third axis Z passing through an intersection with the second axis Y. The lens 3 at the lower end of the shaft 30
5 is fixed and swingably supported. here,
The first axis X and the second axis Y, and the second axis Y and the third axis Z are orthogonal to each other, and the three axes XYZ intersect at a point O (note that the first axis The crossing angle between X and the third axis Z changes depending on the swinging angle of the second swinging member 20.), and this point O is the same as the round ball 4a in FIG.
Is equivalent to the ball center Q of. According to this apparatus, the polishing angle can be freely set by changing the length of each swing member, and stable polishing processing with a small polishing angle can be performed.

[0004]

However, in the above-mentioned apparatus of the prior application, a rolling bearing such as a ball bearing is used for supporting the work supporting shaft with respect to the second swinging member, so that There was a problem. That is, in the above device, the lens is driven while being rotated by the frictional resistance generated between the lens and the polishing dish, but in the case of a lens having a small diameter, the generated frictional resistance is defeated by the rolling resistance of the rolling bearing and is driven to rotate. There is a problem that only a large lens can be polished because it disappears. Also,
There is also a problem that the external precision is transmitted to the lens via the rolling bearing during polishing or the rolling bearing itself becomes a source of vibration, which deteriorates the surface accuracy of the polishing surface. Furthermore, since a grinding liquid is used for polishing the lens,
There is also a problem that rolling bearings need frequent maintenance.

The present invention has been made in view of the above problems, and enables polishing of a small-diameter lens by a work supporting structure having a low rotational resistance, and at the same time, the generation and transmission of vibrations in the bearing portion is blocked to provide a polished surface. It is an object of the present invention to provide a work supporting device for an optical element polishing machine capable of improving the surface accuracy of the above.

[0006]

In order to achieve the above object, in the work supporting device of the optical element polishing machine of the present invention, the first
A first swinging member that swings about an axis of
A second swing member attached to the first swing member so as to swing about a second axis orthogonal to the axis of the first axis, and an intersection of the first axis and the second axis. A work supporting device for an optical element polishing machine, comprising: a work supporting shaft supported by the second rocking member so as to rotate about a third shaft passing through the second rocking member. In contrast, a hydrostatic bearing is used to support the work support shaft.

In the present application, the term "hydrostatic bearing" is not limited to the general meaning of a plain bearing that supports a shaft in a bearing by floating it with the pressure of a fluid supplied from another, and particularly, a work supporting shaft. It is used as a concept including a structure in which a fluid is supplied into a space surrounding from the end surface to the side surface to integrally support the work support shaft in the radial direction and the thrust direction.

Specifically, as shown in FIG. 2, a fluid (air or the like) is pumped from the compressor 33 into a slight gap between the upper end portion of the work support shaft 30 and the bearing hole 20b of the second swing member 20. To do.

[0009]

In the work supporting device of the optical element polishing machine of the present invention having the above structure, the work supporting shaft 30 is rotatably supported by the fluid on the second swinging member 20.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a work supporting device for an optical element polishing machine according to the present invention will be described below with reference to the accompanying drawings. Figure 3
FIG. 3 is an exploded perspective view showing the entire work supporting device of the optical element polishing machine. As shown in the figure, this device includes a first swing member 10 that swings about a first axis X and the first axis X.
To swing about a second axis Y orthogonal to
A second swinging member 20 attached to the swinging member 10 of
The second rocking member 2 is configured to rotate about a third axis Z passing through an intersection of the first axis X and the second axis Y.
And a work support shaft 30 (see FIG. 4) supported by 0.

The first oscillating member 10 has a U-shaped yoke shape as a whole, a mounting hole 10a is formed in the central portion, and a tip portion is bifurcated by a notch 10b. Is attached to a hole 11a of a stay 11 fixedly mounted on an upper shaft (not shown) with a bolt 12, a nut 17, and bearings 13 and 15, and is swingable around the first axis X. ing. In addition, 14 is a collar and 16 is a receiving seat.

The second swinging member 20 is integrally formed in a portal shape as a whole, and has a bearing hole 20b, which will be described later, provided at the center of the upper side thereof. After inserting into the bifurcated notch 10b of the swing member, the pin hole 10
By inserting the pin 21 through the c and 20a, the pin 21 is mounted so as to swing about the second axis Y. Reference numeral 22 denotes a cover for preventing the pin 21 from falling off, and 23
Is a bolt that is screwed into the screw hole 10d of the first swing member 10 to fix the cover 22.

Next, the main part of this apparatus will be described with reference to FIG. A static pressure bearing for supporting the work supporting shaft 30 is formed at the center of the upper side of the second swing member 20. Specifically, the bearing hole 20b formed on the lower surface of the upper side of the second swinging member 20 has the inner diameter and the depth both of which are the work support shaft 3
The bearing hole 20b communicates with the upper surface of the second rocking member 20 through the hole 20c, and the rubber tube 31 is interposed therebetween. Is connected to the switching valve 32 and selectively connected to either the compressor 33 or the suction pump 34. Further, on the work supporting shaft 30, a brim portion 30b and a lens attaching portion 30c are formed integrally with the shaft portion 30a.

Here, the first axis X, the second axis Y, and the third axis Z are orthogonal to each other and intersect at a point O, and the point O is at the lens 3.
It is set so as to be located on the tangent line PN at one point P on the outer circumference of No. 5, so that the polishing angle is 0 degree.

Next, when using the work supporting device of the optical element polishing machine of the present embodiment having the above-mentioned structure, first, the lens 35 as a work is attached to the lens attaching portion 30c at the lower end of the work supporting shaft 30, and the polishing tray ( It is supported from below by (not shown). Next, when the switching valve 32 is switched to the compressor 33 side and air is pumped into the bearing hole 20b, the work support shaft 30 is floatingly supported by the second rocking member 20 due to the pressure of the air, and the two are not in contact with each other. It becomes the state of. In this state, when the polishing dish is rotated and the first swing member 10 and the second swing member 20 are swung, the lens 35 is driven to rotate and polishing is performed. When the polishing is completed, the switching valve 32 is switched to the suction pump 34 side, and the work support shaft 3
The lens 35 is removed while adsorbing 0 to the second swing member.

The present invention is not limited to the above embodiment, but may be carried out as follows, for example. (1) In the above embodiment, the introduction of air into the bearing hole 20b is 1
Although it was done only from the individual holes 20c, as shown in FIG.
Air passage 2 reaching the side surface of the shaft portion 30a and the brim portion 30b
A plurality of (for example, four points) 0d may be provided symmetrically. In this way, if the air pressure is directly applied to the side surface of the shaft portion 30a, it becomes difficult for the shaft portion 30a to contact the inner circumference of the bearing hole 20b, and the stability of the work support can be improved.

(2) Although air is used as the fluid to be supplied to the hydrostatic bearing in the above embodiment, a polishing liquid may be used instead of air. Specifically, instead of the compressor 33,
Connect the grinding fluid delivery pump. Since the grinding liquid has a higher viscosity than air, it is possible to further reduce the possibility that the shaft portion 30a comes into contact with the inner circumference of the bearing hole 20b.

[0018]

As described above, according to the work supporting device of the optical element polishing machine of the present invention, the static pressure bearing is used for supporting the work supporting shaft with respect to the second swinging member. Can be supported with an extremely small rotational resistance, and it becomes possible to polish a small-diameter lens which could not be polished by the conventional device. Further, since it is possible to prevent the generation and transmission of vibration in the bearing portion, it is possible to improve the surface accuracy of the polishing surface. Further, there is an advantage that less maintenance is required as compared with the conventional device.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing a work supporting device of an optical element polishing machine to which the present invention is applied.

FIG. 2 is a sectional view schematically showing a main part of a work supporting device of an optical element polishing machine of the present invention.

FIG. 3 is an exploded perspective view showing an entire work supporting device of the optical element polishing machine of the embodiment.

FIG. 4 is a cross-sectional view showing a main part of a work supporting device of the optical element polishing machine according to the embodiment.

FIG. 5 is a cross-sectional view of essential parts showing another example of the work supporting device of the optical element polishing machine according to the present invention.

FIG. 6 is a view showing a work supporting device of a conventional optical element polishing machine.

FIG. 7 is a diagram for explaining a problem of a work supporting device of a conventional optical element polishing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Polishing dish 2 Lens 3 Lens pasting dish 4 Kanzashi 4a Kanzashi ball 10 1st rocking member 10a Mounting hole 10b Notch 10c Pin hole 10d Screw hole 11 Stay 11a hole 12 Bolt 13 Bearing 14 Color 15 Bearing 16 Bearing seat 17 Nut 20 2nd oscillating member 20a Pin hole 20b Bearing hole 20c Hole 21 Pin 22 Cover 23 Bolt 30 Work support shaft 30a Shaft part 30b Flange part 30c Lens attachment part 31 Rubber tube 32 Switching valve 33 Compressor 34 Suction pump 35 Lens X X 1st axis Y 2nd axis Z 3rd axis

Claims (1)

[Claims] 1. A first oscillating member which oscillates about a first axis, and a first oscillating member which oscillates about a second axis orthogonal to the first axis. A second swinging member attached to the second swinging member, and a second swinging member supported by the second swinging member so as to rotate about a third axis passing through an intersection of the first axis and the second axis. In a work supporting device for an optical element polishing machine, the static pressure bearing is used to support the work supporting shaft with respect to the second swing member. Work support device for element polishing machine.