JPH03104547A - Work holder for polishing - Google Patents

Abstract

PURPOSE:To perform the polishing of a lens without generating the dispersion while under polishing by fixing a fixed ring loosely fitted to the outer peripheral face of a lens receiver or the outer peripheral face of a lens coaxially with a holder main body so as to regulate the inclination and movement in the diameter direction of the lens supported on the lens receiver. CONSTITUTION:A lens receiver 14 whole body is made movable in the radial direction smoothly by the steel ball 19 supported on a holder main body 4, because of the upper face of the lens receiver 14 holding the lens being the plane subjected to a mirror working even in the case of causing the slippage in the radial direction on the lens 13 in the case of polishing. The regulation of the moving quantity in the radial direction of the lens receiver of this time is performed at the lower end part 12 of a fixed ring 11 as well as the regulation of the inclination of the lens receiver. Even in the case of the displacement due to the small vibration accompanied by the inclination and rotation within the range that the lens 13 is regulated being caused, it is absorbed with good follow-up property by the smooth relative sliding of the conical recessed part 8 of the holder main body 4, the upper face of the lens receiver 14 and steel balls 19 interposed among those.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polishing work holder for holding a lens to be polished, which is used in a lens polisher. [Conventional technology] The technology related to this type of polishing work holder is as follows:
Japanese Unexamined Patent Publication No. 61-121862, Publication No. 62-376
There is a technique disclosed in Publication No. 27. In the former method, as shown in FIG. 6, the polishing plate 4o is rotated and moved laterally, while a rotatable polishing holder 43 is fixed to the housing 41 via a bearing 42 vertically from the spherical direction of the polishing plate 40. And when applying pressure to polish the lens 44,
A bullet 45 is attached to the tip of the polishing holder 43 to press the lens 44 between the polishing plate 40 and the polishing holder 43. As shown in FIG. 7, the latter is a lens polisher having a lens driving rod 47 that moves in the horizontal direction while always pointing perpendicularly to the surface of a polishing plate 46 that rotates vertically and pushing the surface. This is a lens holding device used in the machine, in which an inverted cup-shaped body 48 is rotatably attached to the tip of a lens drive rod 47, and this feeding cup-shaped body is removably fitted within four days, A lens holder 50 is in contact with the force feeding tab-shaped body 48 via an elastic ring 49 so as to be tilted at a minute angle, and a lens 5l is fitted and held on the lower surface of the lens holder 50. a recessed portion 52;
The lens holder 50 is constructed by communicating holes 53 and 54 that allow the lens 51 to be vacuum-adsorbed by suction.

[Problems to be Solved by the Invention] However, in the former technique (Japanese Unexamined Patent Publication No. 61-121862), since it does not have a mechanism for regulating the movement of the lens 44 in the radial direction, fixed abrasive grindstones, etc. In the case of polishing, the lens 44 is pulled in the radial direction by the polishing resistance, resulting in a problem in that the axis is largely misaligned.

In this regard, in the technique disclosed in the latter (Japanese Patent Application Laid-Open No. 62-37627), the movement of the lens 5l in the radial direction is restricted by the lens holder 50.
is an inverted cup-shaped body 48 via an elastic material 49 made of rubber or the like.
Since the vacuum suction is applied to the
Similar to the technique disclosed in Japanese Patent No. 62, the entire lens holder is pulled in the radial direction due to the polishing resistance during the polishing process, resulting in the phenomenon that the axis of the lens 5l is shifted. When polishing is performed in such a situation, since the bullet material 49 is compressed by the inverted canopy 48 and the lens holder 50, the movement of the lens, that is, the movement of the lens holder in the horizontal direction, is prevented. It becomes impossible to absorb minute displacements in the vertical and vertical directions. As a result, the lens flutters during the polishing process, making it impossible to process or significantly reducing the precision of the machined surface, which is a major cause of a large number of defective products.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a polishing work holder that eliminates the flapping of a lens during polishing and can obtain a high-quality lens with excellent machined surface accuracy. With the goal.

[Means and effects for solving the problems] The polishing work holder of the present invention is rotatably supported by a housing, and has a recess formed on the rotation axis of one end surface and a suction hole opened in the end surface. interposed between a holder body, a lens holder having one end surface in contact with the spherical body and the other surface communicating with the suction hole so as to suction and support the lens, and the concave portion of the holder body and the lens holder. a spherical body that supports a lens holder so as to be tiltable and movable in a direction perpendicular to the axis of the holder body; and a spherical body that is coaxially fixed to the holder body and supported by the lens holder in an inclination and radial direction. It consists of a fixing ring that loosely fits on the outer peripheral surface of the lens or the outer peripheral surface of the lens holder so as to restrict the movement of the lens. Therefore, the fixing ring can restrict the radial deviation of the lens (lens to be polished) to the above-mentioned loose fit range, that is, the minimum necessary range, and within this range, the displacement (tilt) or rotation of the lens can be controlled. The spherical body can absorb displacement due to minute vibrations with good followability.

[Example] The present invention used in a lens polisher will be explained below based on an example. In addition, in the following description, the same reference numerals are given to the same components as the horizontal command part shown in FIG. 1, and the description thereof will be omitted.

(First Embodiment) FIG. 1 is a sectional view showing a first embodiment of a polishing work holder 1 according to the present invention. In the figure, the polishing work holder 1 is a lens polisher (
The holder main body 4 is rotatably supported by a housing 2 attached to a housing 2 (not shown) via a pair of upper and lower bearings 3.

A collar 5 is disposed between the pair of bearings 3, and the bearing 3 is held in the housing 2 by a C ring 6. A communication hole 7 that communicates with a suction pump (not shown) is provided in the axial center of the holder body 4, and the above-mentioned communication hole 7 branches into four directions in the large diameter portion on the lower side of the holder body 4. are doing.

A conical recess 8 is formed at the axial center of the lower surface of the large diameter portion of the holder body 4, and a ring-shaped recess 8 is formed outside the communicating hole 7 opened in the lower surface. There is. A threaded portion of a fixing ring l1 is screwed into a threaded portion 10 provided on the outer peripheral surface of the large diameter portion of the holder body 4. The diameter of the inner central portion of this fixing ring 11 is larger than the inner diameter of the lower end portion 12 of the fixing ring.

A lens receiver 14 for supporting a lens l3, which is a member to be polished, is formed on the lower side of the holder main body 4 so as to be engaged with the lower end 12 of the fixing ring 11. The upper surface of this lens receiver 14 (the upper surface in the figure) is a mirror-finished plane, and the lower surface has a lens 13
A lens receiving recess 15 (a recess having a receiving surface corresponding to the curvature of the lens surface to be supported) is formed to fit and hold the It is locked at the lower end 12 of the fixing ring ll, and the small diameter part 17 of the stepped part is loosely fitted to the lower end 12 of the fixing ring, and the lens A range is set in which the lens 13 can be tilted by 3.5 degrees via the receiver 14. The lens receiver 14 is also provided with a communication hole l8 that communicates with the upper and lower surfaces of the lens receiver. Between the upper surface of this lens holder I4 and the conical recess 8 of the holder body 4, a steel ball 9 for tiltably supporting the lens holder I4 with respect to the holder body is disposed. A V-ring 20 for sealing is provided in the annular groove 9 of the main body. Therefore, the lens holder l is inserted through the communication hole 7 of the holder body 4.
When the lens 13 is attracted to the holder body 4, the large diameter part 16 of the lens holder is separated from the lower end 12 of the fixing ring 11 due to negative pressure.
4 becomes tiltable and movable in orthogonal directions. Based on the above structure, when polishing the lens l3 using a certain polishing work holder I, the gfW! While attaching the lens 13, which is a member, to the lens receiver four parts l5 of the lens receiver l4, a suction bomb (
(not shown) to attract and hold the material. At this time, as described above, the large diameter portion of the lens holder 14 is separated from the lower end of the fixing ring, so that the lens holder can freely move in a direction perpendicular to the axis of the holder body.

Note that even if the large diameter portion is in contact with the lower end portion, if the tip of the VIJ ring 20 is made of a particularly flexible elastic member, it can similarly easily move in the intersecting direction. Next, the lens 13 held by suction on the polishing work holder 1 is pressed against a polishing wheel (not shown) of a lens polisher placed below the lens 13 to perform polishing. According to the structure of this embodiment, even if the lens 13 is displaced in the radial direction during polishing, the upper surface of the lens receiver 14 that holds the lens is a mirror-finished plane.
The steel ball l9 supported by the holder body 4 allows the entire lens receiver l4 to be smoothly moved in the radial direction. At this time, the amount of movement of the lens holder in the radial direction is controlled by the lower end 12 of the fixing ring 1l, as well as the inclination angle of the lens holder. Furthermore, even if the lens l3 is displaced due to minute vibrations due to tilting or rotation within the regulated (limited) range, the space between the four conical parts 8 of the holder main body and the upper surface of the lens receiver l4, and the Due to the smooth relative sliding with the steel ball 19 interposed in the center, absorption can be achieved with good followability. As a result, it is possible to reliably prevent the lens 13 from fluttering during polishing, and to obtain a high-quality lens with excellent machined surface accuracy. (Second Embodiment) FIG. 2 shows a second embodiment of the polishing work holder l according to the present invention.
It is a sectional view showing an example. The feature of this embodiment is that in the lens receiver 14 of the first embodiment shown in FIG. 17 is formed to have the same diameter as the outer diameter of the lens 13, and an elastic O-ring 22 is inscribed in the recess 21 on the upper surface of the lens receiver. Then, a hollow sphere 19 is interposed between the conical recess 8 formed at the lower end of the holder body 4 and the bottom surface 21a of the recess 21 of the lens receiver 14, and the steel ball 19 is attached to the
The rings 22 are brought into contact.

Since the other configurations are the same as those in the first embodiment, similar components are given the same reference numerals and their explanations will be omitted.

Although the same effect as the first embodiment can be obtained with the above structure, according to the polishing work holder 1 of this embodiment, when no radial force is applied to the lens l3, the axis of the lens receiver 14 is The core and the axis of the holder main body 4 can always be defeated.

Moreover, when a radial force acts on the lens l3,
The movement of the lens holder can be absorbed by the elastic deformation of the O-ring 22, and minute vibrations in the radial direction of the lens i3 can also be absorbed with extremely good followability. (Third Embodiment) Fig. 3 is a sectional view showing a third embodiment of the polishing holder according to the present invention.
4 and the holder body 4 is characterized by the receiving part for the steel ball 19. That is, a recess 25 having the same diameter is formed in the axial center of the lower surface of the holder main body 4, and an elastic receiving member 26 is fixed within the recess 25. On the other hand, the lens receiver 14 side is a mirror-finished plane.

Even in the above configuration, the inclination and radial displacement of the lens 13 can be absorbed with good followability, and in particular, the vibration absorbability of the lens in the vertical direction can be greatly improved.

(Fourth Embodiment) FIG. 4 is a sectional view showing a fourth embodiment of the polishing holder (2) according to the present invention. In this embodiment, the material of the lens receiver 14 is made of an elastic body, and the upper surface of the lens receiver 14 is formed into a concave spherical surface. Step portions 27 and 28 are formed at the axial center portion of the lower surface of the lens receiver and at the small diameter portion of the outer circumferential surface, respectively.

According to the above structure, the conical recess 8 is formed at the axial center of the lower surface of the holder main body 4, and the steel ball 19 is received in the recess 8, so that a radial force acts on the lens l3. When not in use, the axes of the holder main body 4 and the lens receiver 14 are always aligned, so the position of the lens 13 is determined and it is easy to attach and detach. In addition, the lens 13 is attached to the lower surface of the lens receiver 14.
The adsorption and retention of the particles is also ensured. Furthermore, the vertical movement of the lens 13 and the displacement of minute vibrations can be absorbed with excellent followability. (Fifth Embodiment) FIG. 5 is a sectional view showing a fifth embodiment of the polishing holder 1 according to the present invention. The feature of this embodiment is that PTFE 30 as a member having a low coefficient of friction and a steel ball receiving member 3 are provided between the lens receiver 14 and the holder main body 4 in the first embodiment shown in FIG.
It is located at the point where l is placed. Therefore, in the case of this embodiment, the entire lens holder consists of the lens holder 14 and the PTFE 30.
and a steel ball receiving member 3l. Four conical parts 32 are formed at the axial center of the upper surface of the steel ball receiving member 3l, and the steel balls 19 are interposed therein.
Similarly to the communication hole 18, a communication hole 33 is provided.

In this embodiment as well, as in the previous embodiment, the lens holder l
The large diameter portion 16 on the outer peripheral surface of the lens 1 is attached to the holder body 4.
3 is separated from the lower edge l2 of the fixing ring 11 when it is held by suction.

In this embodiment, since the movement of the lens receiver 14 with respect to the axis of the holder main body is performed via the PTFE ring 3o, the displacement of the lens 13 in the radial direction can be absorbed with excellent tracking.

〔Effect of the invention〕

As described above, according to the polishing work holder according to the present invention, it is possible to control the radial deviation of the lens within the necessary minimum range, and also to prevent the tilt of the lens, that is, the polishing plate ( The displacement due to the polishing resistance with the polishing wheel (grinding wheel) and the displacement of minute vibrations caused by rotation,
It can be absorbed with good followability within the above regulated range. As a result, the lens can be polished without causing backlash during the polishing process, and a high-quality lens with excellent processing surface durability can be stably obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of the polishing work holder according to the present invention, FIG. 2 is a sectional view of the second embodiment, FIG. 3 is a sectional view of the third embodiment, and FIG. 4 is a sectional view of the third embodiment. A cross-sectional view of the fourth embodiment,
FIG. 5 is a sectional view of the fifth embodiment, and FIGS. 6 and 7 are explanatory views of the prior art. 1...Work holder for polishing 2...Housing 4...Holder body 7.18.33...Communication hole 8, 21, 25.32...Recess 1...Fixing ring 2... Lower end 3...Lens 4...Lens receiver 9...Steel ball (spherical body) 20...■Ring 22...○Ring 26...Elastic receiving member 3]...Steel ball receiver Figure 2 Figure 4 Figure 6 Figure 5 Figure 1 No' Figure 7 Procedural Amendment (Voluntary) April 24, 2016

Claims (1)

[Claims] (1) A holder body rotatably supported by a housing and having a concave portion formed on the rotation axis on one end surface and a suction hole opened in the end surface, one end surface being in contact with a spherical body and the other end surface being a lens. a lens holder having a hole communicating with the suction hole so as to suction and support the lens; and a lens holder interposed between the concave portion of the holder body and the lens holder so that the lens holder can be tilted and intersected with respect to the axis of the holder body. a spherical body supported so as to be movable in the direction of the holder, and an outer circumferential surface of the lens or an outer periphery of the lens receiver fixed coaxially to the holder body and configured to restrict the inclination and radial movement of the lens supported by the lens receiver. A polishing work holder comprising a surface and a loosely fitting fixing ring.