JPH0825135B2 - Work support device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a work supporting device used in an optical element polishing machine, and more particularly, to an object to be polished (workpiece) having a curvature in a longitudinal direction thereof and a curvature in a direction perpendicular thereto. It relates to a work support device suitable for different things, such as cylindrical lenses.

[Prior Art] A technology for polishing a workpiece such as a cylindrical lens is
It is described on page 188 of "New Technology for Manufacturing Lenses and Prisms" published by Chuo Kagakusha.

The cylindrical surface lens is a combined surface of the radius of curvature direction 1 and the generatrix direction 2 as shown in FIGS. 6a and 6b. Therefore, when the cylindrical surface lens 3 is polished, both are simultaneously processed. There must be. When polishing such a cylindrical lens 3, the cylindrical lens 3, which is a workpiece, is generally polished by using a work supporting device 4 as shown in FIG. That is, the figure shows a state in which the cylindrical lens 3 having a concave surface to be polished is being polished, and the cylindrical lens 3 is attached to the attachment tray 5. On the upper part of the sticking plate 5, there is formed an engagement recess 5a which engages with a spherical hair ball 6a formed at the lower end of the upper shaft (hairpin) 6.
The upper shaft 6 is set so as to be swingably driven by a swinging mechanism (not shown) which is a combination of two movements, that is, a forward and backward movement and a left and right movement, and the sticking plate 5 is swiveled through a hairpin 6a. It has a freely movable structure. Below the pasting plate 5, the upper shaft
6, a polishing dish 7 for polishing the cylindrical lens 3 in cooperation with the attachment dish 5 is provided. Polishing surface of polishing dish 7
7a is formed in a convex shape corresponding to the concave surface to be polished of the cylindrical lens 3.

According to the means for polishing using the work supporting device 4 having the above-mentioned configuration, the upper shaft 6 is lowered to move the hair ball 6a.
The cylindrical lens 3 can be polished by pressing the cylindrical lens 3 against the polishing plate 7a of the polishing plate 7 while making the upper shaft 6 oscillate with the spherical center Q as the support point.

In FIG. 7, assuming that the generatrix direction of the cylindrical lens 3 is the Y direction and the direction orthogonal to the Y direction is the X direction, the polishing angle in each direction is as shown in FIGS. That is, FIG. 8a is a sectional view in the X direction in FIG. 7, and shows a tangent line at a point P on the outer periphery of the cylindrical lens 3 in the radius of curvature direction.
Angle between PN and line PQ connecting points P and Q ∠QPN (= θ _O )
Is the curvature polishing angle. FIG. 8b is a cross-sectional view in the Y direction in FIG. 7, showing the angle formed by the busbar SM at one point S on the outer periphery in the busbar direction and the line SQ connecting the S point and the Q point. ∠QSM (= θ _Y ) is the busbar polishing angle. As is known, if the respective polishing angles θ _O and θ _Y are sufficiently small, stable polishing processing can be performed and high accuracy can be obtained. In the cylindrical surface polishing machine, the convex surface or the convex plate of the lens is attached to the lower plate, and the concave surface or the concave plate of the lens is the upper plate, regardless of whether the surface is convex or concave. Also, in order to prevent twisting (tilting) in the direction of the generatrix, processing to attach multiple pieces is
This is to sufficiently reduce the above polishing angles θ _O and θ _Y.

[Problems to be Solved by the Invention] The above-mentioned conventional technique has various problems as described below, and is not satisfactory as a work supporting device.

(1) When polishing a workpiece (lens or the like) having a large radius of curvature, the curvature polishing angle θ _O becomes large, as is apparent from FIG. 8A, which makes the processing difficult.

(2) When polishing a work having a short length in the generatrix direction, the generatrix angle θ _Y of the generatrix becomes large as is clear from FIG. 8b, and in this case as well, polishing becomes difficult. .

(3) Even if one lens is required, the above (1),
As a measure against the problem of (2), a plurality of lenses are required to reduce the polishing angle, the setup in the polishing work is troublesome, and it is economically disadvantageous, and the work efficiency is reduced. Will result.

(4) Since convex lenses can only be processed with the lower plate,
The radius of curvature of the polishing plate of the upper plate changes quickly, making it difficult to stabilize the curvature when processing a large number of lenses.
When exchanging the lens, the polishing dish on the upper dish is removed, and then the lens exchanging work is performed, which makes the work extremely complicated.

The present invention has been made in view of the above-mentioned problems of the prior art, and can be applied to workpieces (cylindrical surface lenses, etc.) having any radius of curvature and length in the generatrix direction regardless of whether they are concave or convex.
Moreover, it is an object of the present invention to provide a work supporting device which holds a work so that it can be stably polished and obtains high surface accuracy.

[Means and Actions for Solving Problems] The present invention relates to a work supporting device for holding an object to be polished having different curvatures in a longitudinal direction and a direction perpendicular to the longitudinal direction, in which the upper shaft of a polishing machine is used. A stay to be held,
A swing member rotatably supported on the first stay via a first support shaft so as to be rotatable around the first support shaft, and a second member having an axis line orthogonal to the first support shaft on the swing member. And a work holding portion rotatably supported about the axis of the workpiece by means of a support shaft, and a tangent line at a point on the outer periphery in the direction of one side of the surface to be polished of the workpiece and the workpiece. The intersection of the axis of symmetry of the polishing body is located near the axis of the rocking center of the rocking member, and at the same time as the generatrix in the other direction or 1 on the outer periphery
By arranging the intersection of the tangent line at the point and the axis of symmetry of the object to be polished near the axis of the swing center of the workpiece holder, the polishing angle in both directions of the workpiece can be made sufficiently small and stable polishing can be achieved. This enables processing and obtains high surface accuracy.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

(First Embodiment) FIGS. 1 and 2a and 2b are explanatory views showing a first embodiment of a work supporting device 10 according to the present invention, and FIG. 1 shows a configuration diagrammatically. 2a is a front view with a left half sectioned, and FIG. 2b is a side sectional view with the left half omitted because it has a bilaterally symmetrical configuration. The work supporting device 10 according to the present embodiment is applied to a work in which the object to be polished (work) has different curvatures in the longitudinal direction and the direction perpendicular to the longitudinal direction, and in the present embodiment, a cylinder is used. An example in which the surface lens is the work 11 is shown.

In the figure, reference numeral 12 denotes a column fixed to the upper shaft of a cylindrical surface grinder (hereinafter, simply referred to as a grinder) not shown. A U-shaped stay 13 is fixed to the lower end of the column 12 with its opening facing downwards.
The central portion of 13 is fixedly held to the column 12 via a fixing screw 14. As shown in FIG. 1, a swing plate (seesaw plate) 15 formed in a generally square V shape in plan view is provided at the lower ends of the support arms 13a of the stay 13 as a support shaft 16 as shown in FIG.
It is swingably supported via. As shown in FIG. 2A, the support shaft 16 is fitted into the holes 17 penetrating both support arm portions 13a of the stay 13, and at the same time, in the swing plate 15 formed in a square shape. The oscillating plate is fitted in the shaft center of the bearing 18 at the center of the two opposing side parts 15a.
The reference numeral 15 is configured to be swingable via the bearing 18 and the support shaft 16. Denoted at 19 is a stopper for restricting the support shaft 16 from coming off, which is fixed to the stay 13 via a fixing screw 20.

As shown in FIG. 1, a work holding member having a substantially U-shape is held at the center of the constituent side portion 15b on the other side orthogonal to the constituent side portion 15a supported by the stay 13 via the support shaft 16. The portion 21 is swingably supported via a support shaft 22. As shown in FIG. 2B, the support shaft 22 is fitted into a hole 23 penetrating the rocking plate 15 and a bearing 24 fitted into the work holding portion 21.
The work holding portion 21 is fitted and inserted in the shaft center portion of the above, and is configured to be swingable about the axis of the support shaft 22 via the bearing 24 and the support shaft 22. Reference numeral 25 denotes a stopper plate for restricting the support shaft 22 from coming off, which is fixed to the swing plate 15 via a fixing screw 26. Work holding part 21 formed in a substantially U shape
Are arranged so that their openings are set downward, and a concave portion 27 for holding the work 11 is formed on the lower surface of the central portion of the horizontal portion 21a of the work holding portion 21. Then, the work 11 is partially held in the recess 27,
It is designed to be held via a lower polishing dish (not shown). The axis of the support shaft 22 intersects with the support shaft 16, and the work holding portion 21 and the swing plate 15 are set so that the swing directions thereof are at right angles to each other.

Assuming that the axis line X of the support shaft 16 which is the center of swing of the swing plate 15 and the axis line 22 of the support shaft 22 that is the center of swing of the work holding part 21 are Y, one point P on the outer periphery of the work 11 in the radius of curvature direction The intersection point F of the tangent line PN at and the symmetry axis U of the workpiece 11 is set to intersect with the X axis, and therefore the curvature polishing angle is set to 0 degree. Further, the intersection E of the busbar M of the workpiece 11 and the symmetry axis U of the workpiece 11 and the Y-axis are set to intersect with each other, so that the polishing angle of the busbar is also set to 0 degree. In the present embodiment, both the curvature polishing angle and the generatrix polishing angle are set to 0 degree, but it is not necessary to set them both to 0 degree because it is desirable to set both polishing angles within 30 degrees. . That is, the intersection F may be located near the X axis, and the intersection E may be located near the Y axis. Also, in this embodiment, the support shaft
The axis of 16 and the axis of the support shaft 22 are set so as to be displaced in the U-axis direction. However, depending on the shape of the workpiece 11 to be polished, the relationship between its curvature and width (length in the generatrix direction). There is also a case where it is set so as not to cause a deviation. Further, in FIG. 1, the oscillating plate 5 and the work holding portion 21 are respectively
Although the configuration is such that the support shafts 16 and 22 are used for supporting the support shafts 16, 22, the support shafts 16 and 22 are not limited to this structure.
It may be a so-called cantilever support structure in which it is supported by 2. In this case, it is needless to say that the oscillating plate 15 and the work holding portion 21 are each configured to be cantilevered.

When the work 11 is polished by using the work supporting device 10 having the above-described structure, the support 12 is moved in the front-rear direction and the left-right direction via the upper shaft (not shown), so that the swing plate 1
5. The work holding section 21 is swung, and the work 11 is polished by cooperation with a polishing dish (not shown). In particular, in this embodiment, since the point corresponding to the ball center of the hairpin in the prior art is an imaginary point, there is no physical limitation as in the prior art. Therefore, both the polishing angle of curvature and the polishing angle of generatrix can be set to arbitrary angles, and both polishing angles can be reduced. As a result, stable polishing is possible and high surface accuracy can be obtained.

(Second Embodiment) FIG. 3 shows a second embodiment of the present invention. The present embodiment shows a configuration example in which the work 11 having a convex cylindrical surface is applied, whereas the work 30 having a concave cylindrical surface is applied, in the first embodiment. In this embodiment, since the work 30 is a work having a concave cylindrical surface, the position of the swing center of the swing plate 15 is set differently from that of the first embodiment. That is, the work
One point in the radius of curvature of the concave cylindrical surface (surface to be polished) at 30
Intersection F ₁ of the symmetry axis U tangent P ₁ N ₁ and the workpiece 30 in the P ₁ is set so as to be in the swing center. Other configurations are
Since it is the same as that shown in FIGS. 2A and 2B, the same members are designated by the same reference numerals and the description thereof is omitted.

According to the present embodiment, the workpieces having different shapes (concave, convex, etc.) or different dimensions (curvature, length, etc.) can be stably polished simply by changing the center position of the rocking plate 15. This has the advantage that the applicable range of the work can be expanded. Other functions and effects are the same as those of the first embodiment, and thus the description thereof is omitted.

(Third Embodiment) FIG. 4 shows a third embodiment of the present invention. In the first embodiment, an example in which the support column 12 is fixed to the upper shaft of a grinder (not shown) is shown, but in the present embodiment, the support column 12 is rotatable with respect to the upper shaft. Is. That is, in the figure
Reference numeral 40 denotes a housing fixed to an upper shaft (not shown), and a hollow recess 41 having a circular cross section is formed at the axial center of the housing 40. Two radial bearings (bearings) 42 are fitted in the hollow recess 41, and the column 12 is
The radial bearing 42 is fixed to the stay 13 with fixing screws 14 in a state of being fitted into the axial center portion of the radial bearing 42. 43 and 44 are spacers, 45 is a thrust bearing, and 46 is a retainer. Other configurations are
Since it is the same as FIGS. 2A and 2B, its illustration and description will be omitted.

According to this embodiment, in addition to the action and effect of the first embodiment, even if the generatrix direction of the work and the generatrix direction of the polishing dish are slightly deviated, the deviation is corrected by rotating the work holding device 10. Therefore, it is possible to make the work and the polishing dish compatible with each other and perform highly accurate polishing.

(Fourth Embodiment) FIGS. 5A and 5B show a fourth embodiment of the present invention. In this embodiment, the work holding unit 2 has the configuration shown in FIGS.
1 is formed in a substantially L-shape, and the work holding portion 21 is supported by the swing plate 15 in a cantilevered state. That is, L
A work holding portion 21 formed in a V shape is swingably supported by a swing plate 15 via a bearing 50 and a support shaft 51. 51
The lock nut is indicated by a. A square (square-shaped) hole 52 is formed at the tip of the work holding portion 21, and a sticking plate 53 having a square upper portion is inserted into the hole 52 so that the plate 53 can be inserted therein. I am doing it. The work (toric surface lens) 11 attached to the attachment plate 53 is set so as to be held via a lower polishing plate (not shown).

The axis X, which is the swing center of the swing plate 15, is on the tangent line P ₁ N ₁ at one point P _{1 on} the outer periphery in the radius of curvature R ₁ direction, and the axis Y, which is the swing center of the work holding unit 21. Is set at a position which becomes a tangent line P ₂ N ₂ at one point P ₂ on the outer periphery in the radius of curvature R ₂ direction, and the polishing angle in each direction is set to 0 °. Other configurations are the same as those in FIGS. 2A and 2B, and thus the same members are designated by the same reference numerals and the description thereof is omitted.

According to this embodiment, not only the cylindrical surface of the work but also the toric surface can be polished. Further, since the work holding portion 21 has a cantilevered support structure, there is an advantage that the work 11 can be easily attached and detached. The other actions and effects are the same as those shown in the first embodiment, and therefore their explanations are omitted.

It should be noted that, although the example in which the single lens is polished has been described in the above embodiment, the present invention is not limited to this embodiment, and for example, a work such as a flat prism, a cylindrical surface mold, or a toric surface mold is polished. Of course, it can be used as a work supporting device. Further, in the present invention, it is also possible to perform a large number of attachments.

[Effects of the Invention] As described above, according to the present invention, the point corresponding to the ball center of the hairpin in the prior art can be set at any position as an imaginary axis. The curvature polishing angle and the generatrix polishing angle of an object to be polished (workpiece) having different curvatures in a direction perpendicular to
The work can be stably polished as described above. As a result, high surface accuracy can be obtained.

[Brief description of drawings]

1 and 2 a and b are explanatory views showing a first embodiment of the device according to the present invention, and FIG. 3 is a side view showing a second embodiment of the device according to the present invention on which the left half is omitted. Sectional views, FIGS. 4 and 5a, b are explanatory views of the third and fourth embodiments of the apparatus according to the present invention, respectively, FIGS. 6a, b, 7 and 8a, b. [FIG. 3] is an explanatory diagram of a conventional technique. 11 ... Work 13 ... Stay 15 ... Oscillating plate 16 ... Spindle 21 ... Work holding part 22 ... Spindle

Claims (1)

[Claims] 1. A work supporting device for holding an object to be polished, which has different curvatures in a longitudinal direction and in a direction perpendicular to the longitudinal direction, and a stay retained by an upper shaft of a polishing machine and the first stay. A swing member rotatably supported around the first support shaft about the first support shaft; and a second support shaft having an axis orthogonal to the first support shaft on the swing member. And a symmetry axis of the object to be polished and a tangent line at one point on the outer periphery of the object to be polished in one direction of the surface to be polished. The intersection of
It is located near the axis of the swing center of the swing member, and the intersection of the tangent line at one point on the generatrix of the other side or the outer periphery and the axis of symmetry of the object to be polished is set to the swing of the work holding part. A work holding device, characterized in that the work holding device is configured so as to be positioned near the axis of the moving center.