JP2001252855A - Forming method for lens polishing plate and its device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forming method for a lens polishing plate capable of polishing the polishing plate having a high-precision polished surface without dispersion and a high-quality lens and to provide its device. SOLUTION: In this application, an adhesive 23 is applied to a base plate part 9c of a lens polishing base plate 9, the base plate 9 is mounted on a plate curved surface 8a of a die plate 8 having a polishing sheet 10 mounted, a pressing member 22 is fitted to the base plate 9, the pressing sheet 10 is compressed by pressing force according to the movement amount of the pressing member 22 by abutting and pressing a pressing part 22c on a flat surface 9d of the base plate 9, the forming device 21 is heated in a heating furnace for a certain period under this condition, and thereafter the polishing sheet 10 is stuck to the plate curved surface 8a of the base plate 9, so that the lens polishing plate is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for molding a lens polishing dish, and more particularly to a method and an apparatus for molding a lens polishing dish by attaching a polishing sheet to a curved surface of a lens polishing table.

[0002]

2. Description of the Related Art In automating lens polishing, in order to obtain a large number of lenses with stable quality without any adjustment, in addition to mechanical conditions, it is necessary that the polishing surface of a lens polishing dish always have a constant performance. there were.

Conventionally, as a polishing member of a lens polishing dish,
Although the pitch was used, the polishing plate on which the pitch was affixed could lose its shape at high temperatures. Therefore, the polishing speed was limited to 250 revolutions / minute, the efficiency of lens polishing was poor, and the pitch surface was polished. It is necessary to perform streaking to allow the glass powder to escape, but depending on the state of formation of this streak, a high-quality lens cannot be obtained. A lens polishing dish formed by attaching a porous polishing sheet in which a polishing material is impregnated into polyurethane, polyester, or the like is used. When the lens is polished using this polishing sheet, the glass powder is absorbed by many small holes formed in the sheet, and a stable high-quality lens can be obtained.

In order to form a lens polishing dish by attaching the polishing sheet to a lens polishing plate, a molding apparatus 1 having a structure as shown in FIGS. 6 and 7 has been used. The molding device 1 includes a rectangular horizontal first support member 2 serving as a base, a second support member 3 of the same shape arranged in parallel above the first support member 2, A molding frame 6 comprising two cylindrical connecting members 4 and 5 fixedly mounted on both sides of the second supporting members 2 and 3 and connecting the two supporting members 2 and 3 is provided. And the first
In the center of the supporting member 2, a short cylindrical dish receiver 7 having an internal thread on the inner peripheral surface is fixedly mounted. The provided mold plate 8 is screwed and mounted. The mold plate 8 is adapted to a lens polishing plate 9 used for molding the lens polishing plate. The upper surface of the mold plate 8 is provided with a horizontal upper peripheral surface portion 8b. A spherical dish surface 8a having the curvature of the polishing lens is formed.

At the time of molding the lens polishing plate, a polishing sheet 10 (shown in FIG. 3) is placed on the curved surface 8a of the mold plate 8, and an adhesive is applied to the curved surface 9a. The lens polishing table 9 is pressed.
The lens polishing base plate 9 is formed integrally with an umbrella-shaped base plate portion 9c at the tip of a shaft portion 9b. The outer surface of the plate portion 9c is a dish curved surface 9a (see FIG. 7) formed in a spherical shape having the curvature of the polishing lens.
The portion opposing the peripheral edge of a is formed on a flat surface 9d perpendicular to the peripheral surface of the shaft portion 9b. The polishing sheet 1 is attached to the base plate 9 at the base of the shaft portion 9b of the base plate 9.
After affixing the lens polishing plate to form a lens polishing plate, a screw portion 9e for attaching the lens polishing plate to a rotation driving unit of the lens polishing machine is integrally formed. Further, a base end surface of the base portion serves as a pressing force transmitting member. A concave portion 9f for stably supporting the steel ball 11 is formed.

At the center of the second support member 3, a female screw is engraved on an inner peripheral surface, and a screw ring 13 with an index 12 is fitted and fixed on the outer peripheral surface. This screw ring 13 has a pressing rod 1 having a male screw portion (not shown) on the outer periphery of the upper half.
4 is screwed, and a part of the lower half thereof is
The tip of the lower end thereof is opposed to a steel ball 11 placed on the base end of the shaft portion 9b of the lens polishing base plate 9 when the lens polishing plate is formed. At the center of the surface, a concave portion 14a for stably pressing the steel ball 11 is formed.

The upper end of the pressing rod 14 protrudes upward from the upper end surface of the screw ring 13, and the operating portion 15 is integrally fixed to the protruding end. The pressing rod 14 can be moved up and down in the screw ring 13 by rotating the operation unit 15. The operation section 15 is formed in a rectangular shape that is easy to operate, and a scale ring 16 is integrally fixed below the operation section 15. The graduation ring 16 is provided with a graduation 16a corresponding to a dimension for moving the pressing rod 14 up and down on the peripheral surface thereof. You can know the amount.

To mold a lens polishing dish using the molding apparatus 1, first, a hot-melt hot-melt (trade name) is applied to the dish curved surface 9a of the lens polishing table 9 heated to about 150 ° C. After the polishing sheet 10 is placed on the curved surface 8 a of the mold plate 8, the operation unit 15 is rotated to rotate the pressing rod 14, and the base plate 9 is moved to the mold plate via the steel ball 11. Press 8. As shown in FIG. 8, the polishing sheet 10 has a disk-shaped sheet cut radially in accordance with the curvature of the dish curved surface 9 a of the base plate 9, and has a wheel shape having a large number of radial pieces 10 a. ing. The pressing amount of the pressing rod 14 is determined by pressing the base plate 9 against the mold plate 8 without sandwiching the polishing sheet 10 in advance. At this time, the scale 16a indicated by the index 12 is read. The thickness of the sheet 10 is measured with the scale 16a across the sheet 10, and the rotation amount of the operation unit 15 is determined from the result. Then, the operation unit 15 is rotated until the predetermined scale 16a coincides with the index 12, and the pressing bar 14 is lowered to thereby move the base plate 9
Press down. Then, the polishing sheet 10 is compressed by a predetermined amount between the mold plate 8 and the pressing force. For example, the sheet 10 having a thickness of about 0.5 mm is affixed to the dish surface 9a of the base plate 9 with an adhesive while being compressed to a thickness of about 0.3 mm.

Then, in a state where the molding apparatus 1 is naturally cooled by cool air and the adhesive is solidified, the operation section 15 is rotated in the reverse direction, and the pressing rod 14 is rotated upward to rotate the pressing rod 14.
Is released, and the lens polishing table plate 9 with the polishing sheet 10 adhered to the curved surface 9a is removed from the molding apparatus 1. The lens polishing plate 9 to which the sheet 10 is attached becomes a lens polishing plate.

[0010]

In the above-described conventional molding apparatus 1, the lens polishing table 9 may be pressed against the mold plate 8 in an inclined state. In this case, the plate curved surface 9a of the base plate 9 comes into contact with the plate curved surface 8a of the mold plate 8 while being deviated from a regular position, so that the polishing sheet 10 has a uniform compressive force over the entire surface. Therefore, a polishing dish having a polishing surface having a desired curvature cannot be obtained. For this reason, a correction work for correcting the base plate 9 to a proper pressing position is required. However, it is difficult to accurately position the base plate 9 on the mold plate 8, and the correction work requires time. In addition, this operation required skill. Also, using a lens polishing dish having the above-described non-uniformly compressed polishing sheet is a major obstacle to automation of lens polishing, and it is extremely important to make the compression amount of the polishing sheet uniform. is there.
In particular, when a certain number of lenses are polished in the lens polishing dish, the polishing sheet is worn out, and it is necessary to replace the polishing sheet with a new one. In addition, since the compression state of the polishing sheet is different, it is necessary to change the processing conditions of the lens for each lens polishing dish when polishing the lens, which also requires cumbersome and skilled work. Was.

In view of the above, it is an object of the present invention to apply a constant pressing force in a direction parallel to the center axis of the plate to the peripheral portion of the curved surface of the plate for polishing the lens. The present invention provides a method and an apparatus for molding a lens polishing dish in which a constant amount of polishing sheet is compressed by contacting a regular position of a mold dish.

[0012]

According to a first aspect of the present invention, a lens polishing base plate is pressed onto a mold plate having a dish curved surface corresponding to the dish curved surface of the same plate, and the lens polishing plate is placed on the mold plate. In a method of forming a lens polishing dish by bonding an abrasive sheet placed on a curved surface of the plate with an adhesive to the peripheral surface of the curved surface of the plate, the peripheral portion is a mold plate. A pressing member having a pressing portion for pressing toward and a mold plate contact portion facing the upper peripheral surface of the mold plate applies a constant uniform pressing force to the plate in a direction parallel to the central axis of the plate, A method of molding a lens polishing plate, characterized in that the polishing plate is attached to the plate curved surface of the base plate by giving the die plate abutting portion to contact the upper peripheral surface of the die plate, The invention of claim 2 is an apparatus for forming a lens polishing dish by attaching a polishing sheet to a curved surface of a lens polishing table plate. A mold plate having a dish curved surface matching the dish curved surface of the lens polishing base plate, a first support member for mounting and holding the mold plate, a pressing rod having a pressing portion at a tip, and A second support member for vertically screwing and supporting the pressing rod such that a pressing portion of the pressing rod faces a mold plate on the first supporting member; A connecting member that joins the supporting member in parallel and at a fixed distance, and a cap-shaped cylindrical body whose upper surface opening is closed by a ceiling wall, the lower end surface of which is formed on the periphery of the curved surface of the plate. Opposite
A pushing portion that presses the peripheral portion toward the mold plate, and a mold plate, which is in contact with a lower outer peripheral surface of the cylindrical body above the pushing portion with a predetermined distance from the pushing portion, and A pressing member having a mold plate abutting portion facing the peripheral surface and loosely fitted around a shaft portion of the lens polishing base plate; and a center portion of the upper surface of the ceiling wall of the pressing member and the pressing bar. And a pressing force transmitting member interposed between the pressing portion and a pressing sheet. The pressing force is transmitted to the pressing member via a transmission member, and the platen is pressed by the pressing portion until the plate contact portion of the pressing member comes into contact with the template and stops. A lens polishing dish forming apparatus, characterized in that the polishing sheet is attached to a curved surface of the dish. According to a third aspect of the present invention, the pressing member according to the second aspect of the present invention is configured such that the cap-shaped cylindrical body portion and the cylindrical body portion integrally having the mold plate contact portion and the platen pushing portion are separate. An apparatus for forming a lens polishing dish, which is formed and is detachable from each other.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments.

(First Embodiment) FIGS. 1 and 2 show a lens polishing dish forming apparatus according to a first embodiment of the present invention. Most of the components of the molding apparatus 21 are the same as those of the conventional molding apparatus 1 described above.
Therefore, the description of the configuration of the common members is omitted here, and the same reference numerals are used. The molding device 21 newly uses a pressing member 22 formed of a cap-shaped tubular body whose upper surface opening is closed by a ceiling wall. The pressing member 22 is formed of a cylindrical body whose inner diameter is slightly larger than the outer diameter of the shaft portion 9b of the base plate 9 so as to loosely fit around the shaft portion 9b of the lens polishing base plate 9. I have. On a lower outer peripheral surface of the pressing member 22, a mold plate contact portion 22a facing the upper circumferential surface portion 8b of the mold plate 8 is formed. The mold plate abutment portion 22a is formed by a flange, and its outer periphery substantially coincides with the outer periphery of the mold plate 8, and the lower surface of the flange is a flat mold plate abutment surface 22b. . Further, on the lower end surface of the pressing member 22, a pressing portion 22c for pressing a flat surface 9d facing the peripheral portion of the dish curved surface 9a of the base plate 9 is formed. In the counter sunk abutment portion 22a upper of the pressing portion 22c, it is spaced apart by a predetermined dimension d _1. That dimension d ₁ from the lower surface of the pressing portion 22c to the lower surface of the mold pan abutment 22a is dimensioned to compress the abrasive sheet 10. In the center of the upper surface of the closed ceiling wall of the pressing member 22, a concave portion 22d for stably supporting the steel ball 11 as a pressing force transmitting member is formed.

In order to mold a lens polishing dish using the molding apparatus 21 constructed as described above, first, as shown in an enlarged view in FIG. 9a is coated with an epoxy resin adhesive 23 having an adhesive force greater than that of hot melt and having excellent heat resistance, and the plate 9 is mounted with a wheel-shaped polishing sheet 10 as shown in FIG. The plate 8 is placed on the curved surface 8a of the plate. Next, when the pressing member 22 is fitted to the shaft portion 9b from above the shaft of the base plate 9, the member 22 completely covers the screw portion 9c and the shaft portion 9b of the base plate 9 and pushes the pressing portion. The part 22c is the base plate 9
Is placed on the plate 9 in contact with the flat surface 9d. In this state, the operation unit 15 is rotated to operate the pressing rod 14.
To rotate the steel ball 11 to the concave portion 22 on the upper end surface of the pressing member 22.
When the base plate 9 is lightly abutted, at this time, the base plate 9 is regulated by the pressing member 22, and is held so that its central axis is almost completely close and coincides with the central axis of the mold plate 8. The reason is that, in the above-mentioned state in which the pressing force is not yet applied by the pressing rod 14, as shown in FIG. in a state in which spaced and 8b, the gap d ₂ of both are at even the slightest corresponding to the compression amount of the polishing sheet 10, a slight inclination of the pressing member 22, the abutment surface 22b and the upper peripheral surface portion 8b.

In this state, over the entire circumference of the pressing member 22,
A gap d ₂ between the abutment surface 22b and the upper peripheral surface 8b of the mold plate 8
The operator makes a slight modification so that the central axis of the plate 9 completely coincides with the central axis of the mold plate 8, and the curved surface 9a of the plate 9 , Is accurately positioned and opposed to the dish curved surface 8a of the mold plate 8.

In this state, when the operating portion 15 is further rotated to lower the pressing rod 14, the pressing member 22 is pressed down via the steel ball 11, and the pressing force of the pressing member 22 is reduced. The pressing force is transmitted to the flat surface 9 d of the base plate 9 by the pressing portion 22 c of the base 22. When Thai sala 9 compresses the polishing sheet 10 is pressed by the moving amount by the pressing member 22 corresponding to the clearance d _2, as shown in FIG. 4, abutment surface of the mold pan abutment portion 22a of the pressing member 22 22b is the upper peripheral surface 8 of the mold plate 8
At this point, the pressing of the pressing member 22 and the plate 9 is stopped.

The projecting length _{d 1} of the pushing portion 22c is sheet 1
When the compression amount of 0 is determined and the abutment surface 22b abuts on the upper peripheral surface portion 8b of the mold plate 8, the platen 9 is not pressed any more and the sheet 10 is not compressed. In the case of 21, the pressing while reading the scale 16a is not required, and the operation is easy. In this state, the polishing sheet 10 receives a uniform pressing force over the entire surface, and for example, the sheet 10 having a thickness of about 0.5 mm is uniformly compressed to a thickness of about 0.3 mm. Then, the abutting surface 22b of the pressing member 22
Is pressed into the upper peripheral surface 8b of the mold plate 8, the molding apparatus 21 is placed in a heating furnace for a certain period of time, for example, at 200 ° C.
For 40 minutes. By this heating, the polishing sheet 10 is plastically deformed, and partial distortion of the sheet 10 caused by being pressed against the curved surface 9a of the base plate 9 is removed, and the polishing sheet 10 becomes uniform. After the heating, the molding device 21 is taken out of the heating furnace and cooled by cool air. Then, the operation unit 15 is rotated in the reverse direction to rotate the pressing rod 14 upward, so that the pressing force of the pressing rod 14 is loosened, and the pressing member 22 and the dish surface The lens polishing table 9 with the polishing sheet 10 adhered to 9a is removed from the molding device 21. This polishing sheet 1
The base plate 9 to which 0 is attached becomes a lens polishing plate, and the polishing plate has a polishing surface having a predetermined curvature.

As described above, in the molding apparatus 21, conventionally,
A cap-type pressing member 22 is provided on the molding apparatus 1 used.
Is used, the base plate 9 always faces the predetermined position of the mold plate 8, and the compression amount of the polishing sheet 10 becomes uniform, so that the same polishing surface is formed no matter how many times the polishing plate is formed. Can be formed. Therefore, if a lens polishing dish molded by the molding apparatus 21 is used, it is possible to constantly perform constant-quality lens polishing. The rotation speed of the lens polishing dish can be as high as 4000 rotations / minute. When the worn abrasive sheet 10 is peeled off, the sheet 10 is peeled off by applying a washing machine such as trichlene solution or ultrasonic wave to dissolve the epoxy resin adhesive 23. The plate 9 may be wiped with the mixed solution of the above.

(Embodiment 2) The pressing member 22 of Embodiment 1 is a single molded body. In addition to this, for example, as shown in FIG. A pressing member 26 including a cap portion 24 covering the 9b and a short cylindrical adjust ring portion 25 having a contact portion 25a forming an abutment surface 25b and a pressing portion 25c may be used. In this case, the cylindrical portion 25 of the adjust ring portion 25
d is loosely fitted to the cap portion 24,
Adjustment of the position of the base plate 9 with respect to the mold plate 8 may be performed by moving only the adjust ring portion 25. Also, this pressing member 2
In 6, it may be exchanged only adjust ring portion 25 having different protruding length d ₁ of the base tray pushing portion 25c in accordance with the amount of compression of the sheet 10.

[0021]

As described above, according to the present invention,
A cap-type pressing member is used to press a flat portion facing the peripheral portion of the curved surface of the plate of the lens polishing plate with a constant and uniform pressing force in a direction parallel to the central axis of the plate. Is always in contact with the regular position of the mold plate, and the polishing sheet is affixed to the base plate in a state of being uniformly compressed over the entire surface thereof. For this reason, a polishing plate having a highly accurate polishing surface with a constant curvature without any variation can be easily formed even by a non-expert. In addition, by using the polishing plate thus obtained, high-quality lens polishing can always be performed. Further, the molding device exhibits excellent effects such as a simple configuration in which a cap-shaped pressing member having a simple shape is added to a conventional device and used.

[Brief description of the drawings]

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

FIG. 2 is a front view showing a main part of the device shown in FIG. 1 in cross section.

FIG. 3 is an enlarged sectional view of a main part of the device shown in FIG. 1 before pressing.

FIG. 4 is an enlarged sectional view of a main part after pressing of the device shown in FIG. 1;

FIG. 5 is an enlarged sectional view of a main part of a lens polishing dish forming apparatus according to a second embodiment of the present invention.

FIG. 6 is a perspective view showing an example of a conventional lens polishing dish forming apparatus.

FIG. 7 is a front view showing a main part of the device shown in FIG. 6 in a cross section.

FIG. 8 is a plan view showing an example of a polishing sheet.

[Explanation of symbols]

 1, 21 lens polishing dish forming device 2, 3 first and second support members 4, 5 connecting member 8 mold dish 8a dish curved surface 8b upper peripheral surface portion 9 lens polishing table plate 9a dish curved surface 9b shaft portion 9d flat surface 10 for polishing Sheet 11 Steel ball (pressing force transmitting member) 14 Pressing rod 22, 26 Pressing member 22a, 25a Type plate contact portion 22b, 25b Abutment surface 22c, 25c Pushing portion

Claims (3)

[Claims] 1. A plate for lens polishing is pressed onto a mold plate having a dish curved surface corresponding to the dish curved surface of the same plate, and the polishing sheet placed on the mold plate is placed on the curved surface of the dish plate. A method of forming a lens polishing dish by applying an adhesive to the upper surface of a mold plate, comprising: a pressing portion facing the peripheral portion of the curved surface of the plate and pressing the peripheral portion toward the mold plate. A pressing member having a mold plate abutting portion facing the surface applies a constant and uniform pressing force to the platform in a direction parallel to the central axis of the mold plate, and the mold plate abutting portion contacts the upper peripheral surface of the mold plate. A method for forming a lens polishing dish, wherein the polishing sheet is applied to the curved surface of the plate so that the polishing sheet is provided until it comes into contact. 2. An apparatus for forming a lens polishing dish by attaching a polishing sheet to a curved surface of a plate for polishing a lens, comprising: a mold plate having a curved surface corresponding to the curved surface of the dish for a lens polishing; A first support member for mounting and holding the mold plate; a press bar having a press portion at the tip; and a press bar such that the press portion of the press bar faces the mold plate on the first support member. A second supporting member for vertically screwing and supporting the first supporting member, a connecting member for connecting the first supporting member and the second supporting member in parallel and at a fixed distance, and a top surface opening having a ceiling It consists of a cap-shaped cylinder closed by a wall,
A pressing portion opposing the peripheral edge of the dish surface of the base plate on the lower end surface thereof and pressing the peripheral edge toward the mold plate; A pressing member loosely fitted around a shaft portion of the lens polishing base plate, having a die plate contact portion facing the upper peripheral surface of the die plate and projecting and contacting with a predetermined distance from the portion; And a pressing force transmitting member interposed between a center portion of the upper surface of the ceiling wall of the pressing member and the pressing portion of the pressing rod, and a polishing sheet is placed on a curved surface of the mold plate. The pressing rod is screwed and rotated to transmit the pressing force to the pressing member via the pressing force transmitting member, and the pressing plate comes into contact with the die plate to stop. The polishing plate is pressed by the pressing portion until the polishing sheet is stuck to the curved surface of the plate. Molding apparatus. 3. The pressing member has a cap-shaped cylindrical body portion and a cylindrical body portion integrally having the mold plate abutting portion and the platen pressing portion integrally formed, and is detachable from each other. 3. A molding apparatus for a lens polishing dish according to claim 2, wherein: