JP5809816B2 - Lens polishing dish manufacturing method - Google Patents

Description

  The present invention relates to a polishing sheet used in a lens polishing dish, a manufacturing method thereof, and a manufacturing method of a lens polishing dish.

  In polishing a lens or the like, a lens polishing dish is used in which a polishing sheet is attached to a substrate (base plate) having a shape (for example, a spherical shape) corresponding to the final finished surface of a lens member to be polished. The polishing sheet is made of a sheet-like member obtained by impregnating a polishing material with a porous material such as foamed polyurethane or foamed polyester, for example, and has a crown shape that is divided into a plurality of petals by making a plurality of cuts from the circular outer periphery. It is used after being molded (see, for example, Patent Document 1). The lens polishing dish is produced, for example, by sticking such a polishing sheet to a base plate with an adhesive, and pressing the polishing plate using a mold plate for forming a polishing surface to closely contact the base plate.

JP 2001-162502 A

  However, in the conventional lens polishing dish, after bonding the polishing sheet to the base plate, the end of the polishing sheet may be peeled off from the base plate. In order to prevent such peeling, for example, in Patent Document 1, it has been proposed to devise the shape of the cut when the abrasive sheet is formed.

  However, since a restoring force is generated when a planar polishing sheet is curved along the platen, it is still difficult to prevent peeling at the end of the polishing sheet even if the shape of the notch is devised. In particular, in a small lens polishing dish for a minute lens (microlens), the smaller the diameter, the easier it is to peel off.

  The present invention has been made in view of the above, and is a polishing sheet capable of suppressing peeling of the end portion from the base plate, a manufacturing method thereof, and a lens polishing plate using such a polishing sheet. An object is to provide a manufacturing method.

  In order to solve the above-described problems and achieve the object, the polishing sheet according to the present invention is a polishing sheet that is used by being attached to a lens polishing platform, and is inserted from the outer peripheral side toward the center. Further, the peripheral portion has a petal shape divided into a plurality of petals by a plurality of cuts, and the peripheral portion is curved.

In the polishing sheet, the peripheral edge portion is thermoplastically deformed.
In the polishing sheet, the peripheral edge portion is compressed and deformed.
In the polishing sheet, the peripheral edge is curved along a spherical shape.

  A method for producing a polishing sheet according to the present invention is a method for producing a polishing sheet that is used by being attached to a lens polishing plate, and from the polishing sheet member that is a raw material of the polishing sheet, the outer periphery of the polishing sheet member A step (a) of forming a corolla shape in which a peripheral portion is divided into a plurality of petals by a plurality of incisions made from the side toward the center; and the polishing sheet member formed into the corolla shape includes: The first curved surface provided in the mold and the second curved surface provided in the second mold paired with the first mold and sandwiched by the second curved surface having a shape corresponding to the first curved surface And a step (b) of bending by holding in a state for a predetermined time.

  In the method for producing an abrasive sheet, in the step (b), the abrasive sheet member is heated at a temperature lower than the melting point of the abrasive sheet member in a state where the abrasive sheet member is sandwiched between the first and second curved surfaces. It is characterized by.

  In the method for producing an abrasive sheet, the step (b) compresses the abrasive sheet member with the first and second molds.

  In the method for manufacturing the polishing sheet, in the step (b), a spacer is disposed between the first and second molds to maintain a distance between the first and second curved surfaces at a predetermined thickness. It is characterized by that.

  The method for producing a lens polishing dish according to the present invention is a polishing sheet having a crown shape in which a peripheral portion is divided into a plurality of petals by a plurality of cuts inserted from the outer peripheral side toward the center, and the peripheral portion A step (c) of applying an adhesive to at least one of the one surface of the polishing sheet that is curved and the first curved surface provided on the lens polishing platform; and The one surface is brought into contact with the first curved surface, and the other surface of the polishing sheet is a second curved surface provided on a mold plate for forming a polishing surface, the first surface (D) contacting the second curved surface having a shape corresponding to the curved surface, and curing the adhesive in a state where the polishing sheet is in contact with the first and second curved surfaces. Step (e).

  In the method for manufacturing a lens polishing dish, in the step (e), the polishing sheet is heated at a temperature lower than the melting point of the polishing sheet in a state where the polishing sheet is in contact with the first and second curved surfaces. It is characterized by that.

  In the method for producing a lens polishing dish, the step (e) compresses the polishing sheet.

  In the method for manufacturing a lens polishing dish, the polishing sheet is curved using a mold having a curved surface having the same shape as the second curved surface.

  According to the present invention, since the peripheral portion of the polishing sheet formed into a corolla shape is curved, it is possible to suppress peeling at the end of the polishing sheet when the polishing sheet is bonded to a lens polishing platform. .

FIG. 1 is a perspective view showing an external appearance of a lens polishing dish according to Embodiment 1 of the present invention. FIG. 2 is a perspective view showing an appearance of the polishing sheet according to Embodiment 1 of the present invention. FIG. 3 is a schematic diagram showing the structure of the lens polishing dish preparation apparatus. FIG. 4 is a schematic diagram showing the appearance of the mold plate shown in FIG. FIG. 5 is a flowchart showing a method for producing a polishing sheet according to Embodiment 1 of the present invention. FIG. 6A is a diagram illustrating a method for manufacturing an abrasive sheet. FIG. 6B is a diagram illustrating a method for manufacturing an abrasive sheet. FIG. 6C is a diagram illustrating a method for manufacturing an abrasive sheet. FIG. 6D is a diagram illustrating a method for manufacturing an abrasive sheet. FIG. 6E is a diagram illustrating a method for manufacturing an abrasive sheet. FIG. 6F is a diagram illustrating a method for manufacturing an abrasive sheet. FIG. 7 is a flowchart showing a method for producing a lens polishing dish according to Embodiment 1 of the present invention. FIG. 8A is a diagram illustrating a method for producing a lens polishing dish. FIG. 8B is a diagram illustrating a method for producing a lens polishing dish. FIG. 8C is a diagram illustrating a method for producing a lens polishing dish. FIG. 8D is a diagram illustrating a method for producing a lens polishing dish. FIG. 9A is a diagram for explaining a comparative example of Embodiment 1 of the present invention. FIG. 9B is a diagram illustrating an example of Embodiment 1 of the present invention. FIG. 10 is a diagram for explaining a modification of the first embodiment of the present invention. FIG. 11A is a diagram illustrating a method for producing a polishing sheet according to Embodiment 2 of the present invention. FIG. 11B is a diagram illustrating a method for producing a polishing sheet according to Embodiment 2 of the present invention. FIG. 12A is a diagram illustrating a method for producing a lens polishing dish according to Embodiment 3 of the present invention. FIG. 12B is a diagram illustrating a method for producing a lens polishing dish according to Embodiment 3 of the present invention. FIG. 12C is a diagram illustrating a method for producing a lens polishing dish according to Embodiment 3 of the present invention. FIG. 12D is a diagram for explaining a method of manufacturing a lens polishing dish according to Embodiment 3 of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited by these embodiments. Moreover, in description of each drawing, the same code | symbol is attached | subjected and shown to the same part. It should be noted that the drawings are schematic, and the dimensional relationships and ratios of each part are different from the actual ones. Also between the drawings, there are included portions having different dimensional relationships and ratios.

(Embodiment 1)
FIG. 1 is a schematic diagram showing the appearance of a lens polishing dish according to Embodiment 1 of the present invention. As shown in FIG. 1, the lens polishing dish 1 includes a polishing dish substrate 10 including a polishing table 11 and a support 12, and a polishing sheet 20 attached to the polishing table 11.

The polishing table 11 has a polishing surface (a sticking surface of the polishing sheet 20) 11a having a curved surface shape (convex spherical shape in FIG. 1) corresponding to the final finished surface of the lens member to be polished.
The support portion 12 is used when the polishing dish base 10 is attached to a polishing apparatus or a lens polishing dish preparation apparatus described later. The support part 12 has a substantially cylindrical shape, and a part of the side surface is provided with a flat part 13 cut into a flat shape in order to identify the direction of the polishing dish base 10. Further, a concave receiving portion 14 is provided at the center of the bottom surface of the support portion 12 opposite to the polishing table 11.
Such a polishing dish base | substrate 10 is formed, for example with alloys, such as a brass and stainless steel.

  The polishing sheet 20 is made of a sheet-like member obtained by impregnating a porous material such as foamed polyurethane or foamed polyester with an abrasive. The polishing sheet 20 is affixed to the polishing surface 11a via an adhesive such as vinyl or epoxy. Further, the surface of the polishing sheet 20 is compressed and molded using a mold plate so as to have a curved shape corresponding to the final finished surface of the lens member to be polished.

  FIG. 2 is a perspective view showing the external appearance of the polishing sheet 20, and is a diagram in which the top and bottom are reversed from FIG. As shown in FIG. 2, the polishing sheet 20 includes a plurality of peripheral portions 21 which are divided into petals by inserting a plurality of cuts 22 from the outer peripheral side of the polishing sheet member (for example, circular shape) which is a raw material toward the center. A corolla shape having a central portion 23 located on the inner peripheral side of the portion 21 is formed. The shape of the polishing sheet 20 is a shape corresponding to the shape of the final finish surface to be polished, and is curved, for example, in a spherical shape. In addition, if the planar shape and size of the polishing sheet 20 before making the notch 22 are shapes and sizes that can cover the polishing surface 11a to the edge when the polishing sheet 20 is attached to the polishing table 11. There is no particular limitation. That is, the polishing sheet 20 in the state before the cut 22 is made has a shape and size including at least a circle whose radius is the length of the meridian connecting the center of the polishing surface 11a and the edge of the polishing surface 11a. For example, it may be a circular shape having a diameter larger than that of the circle, a polygon in which the circle is inscribed or including the circle, and the like.

Next, a method for producing the polishing sheet 20 shown in FIG. 2 and the lens polishing dish 1 using the polishing sheet 20 will be described.
FIG. 3 is a partial cross-sectional front view showing the structure of the lens polishing dish preparation device used for the preparation of the polishing sheet 20 and the lens polishing dish 1. The lens polishing dish preparation apparatus 50 shown in FIG. 3 includes a first support member 51 that is a horizontally disposed base, a second support member 52 disposed in parallel above the first support member 51, and these The first and second support members 51 and 52 are formed on both sides of the opposing surface and have a forming frame body including columnar connection members 53 that connect the first and second support members 51 and 52 to each other. At a substantially central portion on the first support member 51, a cylindrical mold tray receiver 54 having a female screw engraved on the inner peripheral surface is fixed, and the mold tray receiver 54 is paired with the polishing table tray 11. The eggplant mold 30 is screwed and attached. At the time of manufacturing the lens polishing dish 1, the polishing sheet 20 is placed in a recess provided in the mold dish 30, and the polishing sheet 20 is pressed from above by the polishing table dish 11 coated with an adhesive. .

  A female ring is engraved on the inner peripheral surface of the second support member 52, and a screw ring 55 having an index 55a on the outer peripheral surface thereof is fitted and fixed. A press rod 56 having a male thread portion (not shown) formed on the outer periphery of the upper portion (substantially upper half) is screwed into the screw ring 55. The lower part (substantially lower half) of the pressing bar 56 protrudes from the lower surface of the second support member 52. The lower end surface of the pressing rod 56 is an opposing surface of a hard sphere 57 that is disposed on the receiving portion 14 of the polishing dish base 10 when the lens polishing dish 1 is manufactured. A concave portion 56 a is provided on the lower end surface of the pressing rod 56, so that the polishing dish base 10 can be stably pressed via the hard sphere 57.

  The upper end of the pressing rod 56 protrudes from the screw ring 55, and the operation portion 58 is integrally fixed to the protruding end portion. By rotating the operation portion 58, the pressing rod 56 moves up and down in the screw ring 55. Further, the operation portion 58 is formed in a square shape (for example, hexagonal shape) that is easy to operate, and a scale ring 59 is integrally provided at a lower portion thereof. On the circumferential surface of the scale ring 59, a scale 59a corresponding to a dimension for moving the pressing rod 56 up and down is formed. By reading the scale 59a with reference to the index 55a on the screw ring 55, the amount of movement of the pressing rod 56 can be detected.

  In such a lens polishing dish preparation apparatus 50, the mold dish 30 and the polishing dish substrate 10 are arranged so that their central axes coincide with each other.

  FIG. 4 is a schematic diagram showing the appearance of the mold plate 30 shown in FIG. The mold plate 30 is a mold for forming a polishing surface that is used when the polishing sheet 20 is produced or when the polishing sheet 20 is attached to the polishing plate substrate 10, and is formed of, for example, a metal or alloy such as iron or stainless steel. . As shown in FIG. 4, the mold plate 30 includes a disk-shaped plate portion 31 and leg portions 32 that support the plate portion 31.

A concave portion 33 is provided at the center of the upper surface of the dish portion 31. An inner wall surface (sheet molding surface) 34 of the recess 33 has a spherical shape similar to the final finished surface of the lens member to be polished. Further, on the outer peripheral side surface of the plate portion 31, a flat portion having a part cut into a flat shape so as to fit a spanner or the like when the mold plate 30 is screwed into the mold plate holder 54 or released. 35 is provided in two places, for example.
On the other hand, the leg portion 32 has a columnar shape, and a screw portion 36 for fitting the mold plate 30 to the first support member 51 is provided on the side surface of the leg portion 32.

  FIG. 5 is a flowchart showing a method for producing the polishing sheet 20. 6A to 6F are diagrams illustrating a method for producing the polishing sheet 20. Below, the case where the lens grinding | polishing dish preparation apparatus 50 is used as an example is demonstrated.

First, in step S11, a planar sheet member in which a porous material such as foamed polyurethane or foamed polyester is impregnated with an abrasive is prepared as a raw material of the abrasive sheet 20, and the sheet member is prepared from the circular outer peripheral side. A plurality of cuts 22 are inserted toward the center, and the peripheral edge 21 is cut into a plurality of petal-like flower crown shapes (abrasive sheet member 24 in FIG. 6A). Note that the thickness T _s (for example, about 0.5 to 0.6 mm) of the polishing sheet member 24 is determined by the compression amount in a later step and the final thickness T _k (for example, when pasted on the polishing table 11). , About 0.4 mm). Further, the shape and length of the notch 22 are determined based on a shape obtained by developing the spherical shape of the polishing surface 11a.

  The polishing sheet member before making the notch 22 has at least a shape and size that can cover the spherical surface (polishing surface 11a) of the polishing table 11 to the edge when the polishing sheet 20 is attached to the polishing table 11. If you do. The portion that protrudes from the edge of the polishing surface 11a when the polishing sheet 20 is attached to the polishing table 11 can be cut off after application.

  In the subsequent step S12, as shown in FIG. 6B, the polishing sheet member 24 cut into a corolla shape is disposed on the recess 33 so that the center 24a thereof substantially coincides with the center axis O of the mold plate 30. At this time, instead of the polishing dish base 10 shown in FIG. 3, a spare tool 40 including a preliminary table 41 and a support 42 is attached to the lens polishing dish preparation apparatus 50. At this time, the spare tool 40 may be held by an operator's hand or a guide (not shown).

The spare tool 40 is a mold used when the polishing sheet 20 is produced. The preliminary tray 41 has a spherical pressing surface 43 corresponding to the sheet molding surface 34 of the mold tray 30. The radius of curvature R _b of the pressing surface 43 is equal to the radius of curvature R _k of the sheet molding surface 34 of the mold plate 30 and the thickness of the polishing sheet 20 to be produced (thickness before being attached to the polishing plate 11) T _y . Accordingly, the design is such that R _b = R _k −T _y . Further, the support portion 42 has a cylindrical shape similar to that of the support portion 12, and a concave receiving portion 44 that receives the hard sphere 57 is provided at the center of the bottom surface on the side opposite to the spare base plate 41. Such a spare tool 40 is formed of an alloy such as brass or stainless steel in the same manner as the polishing dish base 10.

In addition, when the spare tool 40 is attached to the lens polishing dish preparation apparatus 50, the two are brought into contact with each other in a state where nothing is sandwiched between the pressing surface 43 and the sheet forming surface 34 of the mold plate 30 in advance. The operation unit 58 is rotated, and the value of the scale 59a indicated by the index 55a is read at this time. Then, using the reading value at this time as a reference, the operation tool 58 is rotated and the spare tool 40 is pulled up so that the distance between the pressing surface 43 and the sheet forming surface 34 becomes T _y (for example, the pressing surface 43 and reading the value of the scale 59a which indicator 55a points in the state) sandwiching the member thickness T _y between the seat forming surface 34. The value of the scale 59a is a target value for rotating the operation unit 58 when the polishing sheet member 24 is pressed.

In step S <b> 13, the operation tool 58 is rotated to move the reserve tool 40 downward, and the reserve plate 41 pushes the polishing sheet member 24 into the recess 33 of the mold plate 30. Furthermore, the scale 59a is operated to rotate the operation portion 58 so that the target value, to maintain the thickness of the abrasive sheet member 24 to the T _y.

  In step S14, as shown in FIG. 6C, the polishing sheet member 24 is sandwiched between the pressing surface 43 of the auxiliary tray 41 and the sheet forming surface 34 of the mold plate 30, and the polishing sheet member 24 is curved for a predetermined time, The polishing sheet member 24 is heated. The heating temperature at this time is in the range of normal temperature or higher and lower than the melting point of the polishing sheet member 24. Thereby, the polishing sheet member 24 is thermoplastically deformed.

At this time, the polishing sheet member 24 may be pressed and deformed by being pressed by the auxiliary tray 41, or the curved state may be maintained without compressing the polishing sheet member 24. In the former case, in order to leave a room for compression in the step of attaching the polishing sheet 20 to the polishing table 11 (described later), in step S14, the thickness T _y of the compressed polishing sheet member 24 is determined by the polishing table 11 The compression amount (T _s -T _y ) is kept so as to be thicker than the final thickness T _k (for example, about 0.4 mm) after the polishing sheet 20 is pasted on (see FIG. 6D). . Here, the final thickness T _k is determined by the curvature radius R _d of the polishing surface 11 a of the polishing table 11 and the curvature radius R _k of the sheet forming surface 34 of the mold plate 30 (T _k = R _k). In order to satisfy −R _d ), T _y > T _k , the radius of curvature R _b of the pressing surface 43 may be smaller than the radius of curvature R _d of the polishing surface 11a.

  The heating time and the heating temperature are preferably adjusted according to conditions such as the material and thickness of the polishing sheet member. In the first embodiment, the lens polishing plate preparation apparatus 50 shown in FIG. 6C is left in an atmosphere at about 160 ° C. for about 15 minutes.

  In step S15, heating to the lens polishing dish preparation apparatus 50 is stopped, and the polishing sheet member 24 is cooled to room temperature. Thereafter, as shown in FIG. 6E, the operating portion 58 is rotated to pull up the pressing rod 56, the spare base plate 41 is removed from the mold plate 30, and the polishing sheet member 24 is taken out. Thereby, as shown in FIG. 6F, the polishing sheet 20 curved along the spherical shape is obtained.

Although the curvature radius R _s of the polishing sheet 20 may be slightly larger than the curvature radius R _k of the sheet molding surface 34 after taking out from the mold plate 30, there is no problem as long as the peripheral edge can be kept curved. In order to maintain the curvature radius R _s of the polishing sheet 20 in the vicinity of the curvature radius R _k of the sheet molding surface 34, the heating time in the step S14 is increased or the heating temperature does not exceed the melting point of the polishing sheet member 24. It should be high in the range.

  Next, a method for producing the lens polishing dish 1 will be described. FIG. 7 is a flowchart showing a method for manufacturing the lens polishing dish 1. 8A to 8D are views for explaining a method for producing the lens polishing dish 1. FIG.

  First, in step S21, as shown in FIG. 8A, the polishing sheet 20 is disposed in the recess 33 so that the center 20a thereof substantially coincides with the center axis O of the mold plate 30. At this time, a part of the polishing sheet 20 may protrude from the recess 33.

  In step S <b> 22, a vinyl or epoxy adhesive 15 is applied to the surface (polishing surface 11 a) of the polishing table 11, and the polishing plate base 10 is attached to the lens polishing plate manufacturing apparatus 50. At this time, the polishing dish base 10 is preferably held by the operator's hand or a guide (not shown).

Further, when the polishing dish base 10 is attached to the lens polishing dish preparation device 50, the polishing surface 11a and the sheet molding surface 34 of the mold plate 30 are in contact with each other in the same manner as described in step S12. Then, the value of the scale 59a indicated by the index 55a is read. Then, the reading of the time as a reference, a state where the operation unit 58 distance between the rotating operation polished surface 11a and the sheet shaping surface 34 is pulled up polisher base 10 so that T _k (e.g., polishing surface reading 11a and thickness values of the scale 59a which indicator 55a points in the T-state sandwiching the member _k) between the seat forming surface 34. The value of the scale 59a is the final target value when the operation unit 58 is rotated when the polishing sheet 20 is pressed.

In step S23, as shown in FIG. 8B, the operating portion 58 is rotated to move the polishing dish base 10 downward, and the application surface (polishing surface 11a) of the adhesive 15 and the sheet molding surface 34 are set to the polishing sheet 20. It is made to contact each of both sides. Further, the operation unit 58 is rotated so that the scale 59 a becomes the final target value, and the polishing sheet 20 is pressed toward the sheet forming surface 34 by the polishing table 11. Thereby, as shown in FIG. 8C, to uniformly compress the abrasive sheet 20 to a final thickness T _k. 8B and 8C, the description of the adhesive 15 is omitted.

  In step S24, the adhesive 15 is cured by holding the polishing sheet 20 for a predetermined time while being compressed. At this time, you may heat the polishing sheet 20 according to conditions, such as the material of the polishing sheet 20, a compression amount, and the kind of adhesive agent. In the first embodiment, the lens polishing plate preparation apparatus 50 shown in FIG. 8B is left in an atmosphere at about 195 ° C. for about 30 minutes.

  In step S25, after the adhesive is cured (when the polishing sheet 20 is heated, after the heating is stopped and the polishing sheet 20 is cooled to room temperature), the operation unit 58 is rotated as shown in FIG. 8D. By operating, the pressing rod 56 is pulled up, and the polishing plate base 10 is released from the mold plate 30. Thereby, the spherical shape of the sheet molding surface 34 is transferred, and the lens polishing plate 1 in which the polishing sheet 20 compressed to a desired thickness is attached to the polishing table 11 is completed.

  When the polishing sheet 20 is produced using a polishing sheet member having a size larger than that of the polishing surface 11a (see step S11), at this stage, the portion of the polishing sheet 20 that protrudes from the polishing surface 11a is cut off. good.

As described above, in the first embodiment, the polishing sheet 20 is produced by curving the peripheral portion of the planar polishing sheet member 24, and the polishing sheet 20 is affixed to the polishing table 11 to obtain a lens. A polishing dish 1 is prepared. Therefore, when the polishing sheet 20 is affixed to the polishing table 11, the restoring force of the peripheral edge of the polishing sheet 20 returning to a flat surface can be suppressed, and the peeling of the polishing sheet 20 from the polishing table 11 can be suppressed. It becomes possible to do. In particular, according to the first embodiment, the radius of curvature R _d of the polishing plate 11 is smaller than the thickness T _k of the polishing sheet 20 (for example, R _d / T _k is about 5 / 0.5 or less). Even in the lens polishing dish 1 (for example, a lens polishing dish for polishing a small concave lens), it is possible to satisfactorily suppress peeling at the end of the polishing sheet 20.
Therefore, by using such a lens polishing dish 1, it is possible to stably and accurately polish an optical element such as a spherical lens.

  Moreover, in Embodiment 1, since the polishing sheet 20 is curved by thermoplastic deformation, the peripheral edge portion is reliably maintained even after the polishing sheet 20 is removed from the preliminary plate 41 and the mold plate 30. It becomes possible. In addition, since the stress caused by the bending is relieved by heating, when the polishing sheet 20 is affixed to the polishing table 11, the polishing table is also used in a region where the amount of deformation is large (for example, the end of the polishing sheet 20). It is possible to suppress peeling from the dish 11 and damage to the polishing sheet 20 itself.

Furthermore, according to the first embodiment, there is an effect that the positional deviation can be suppressed when the polishing sheet 20 is stuck to the polishing table 11.
For example, as shown in the comparative example of FIG. 9A, when a flat polishing sheet 90 is attached to the polishing table 11, it is necessary to accurately align the center 90 a of the polishing sheet 90 with the central axis O of the mold plate 30 ( In FIG. 9A (a)), this alignment is difficult without a guide or the like. Further, when the polishing sheet 90 is pushed into the recess 33 using the polishing table 11, the planar polishing sheet 90 needs to be curved, but the restoring force of the polishing sheet 90 is difficult to push because of resistance. At this time, the position of the center 90a of the polishing sheet 90 is shifted with respect to the center 11b of the polishing surface 11a, and as a result of the polishing sheet 90 being stuck to the polishing table 11 in a shifted state, a part of the polishing surface 11a is It may be exposed ((b) in FIG. 9A). On the other hand, as shown in FIG. 9B, since the peripheral portion of the polishing sheet 20 is also curved, the center 20a of the polishing sheet 20 can be easily aligned with the central axis O of the mold plate 30 ((( a)). In addition, since the curved shape of the polishing sheet 20 is originally formed using the mold dish 30, the polishing sheet 20 can be easily pushed into the recess 33 by the polishing table dish 11, and the positional deviation hardly occurs at that time. . Therefore, it becomes possible to easily manufacture the lens polishing dish 1 in which the entire polishing surface 11a is covered with the polishing sheet 20 ((b) of FIG. 9B). In FIG. 9A and FIG. 9B, the description of the adhesive is omitted.

  Further, according to the first embodiment, since the planar polishing sheet member is curved after being cut into a flower crown shape, a large amount of the polishing sheet 20 can be manufactured easily and at low cost.

  In the first embodiment, the polishing sheet 20 is thermoplastically deformed by heating together with the lens polishing dish preparation apparatus 50 (step S14), but the method of thermoplastic deformation is not limited to this. For example, a method may be used in which the polishing sheet member 24 is sandwiched between the mold plate 30 and the preliminary plate 41 that have been heated in advance and held for a predetermined time.

  In the first embodiment, the polishing sheet 20 and the lens polishing dish 1 are prepared by the lens polishing dish preparation device 50. However, between the polishing table 11 and the spare table 41 or the mold plate 30 paired therewith, An apparatus having any configuration may be used as long as the pressing force can be applied.

  In the first embodiment, when the lens polishing dish 1 is manufactured, the adhesive 15 is applied to the polishing table 11 side. However, the adhesive may be applied to the polishing sheet 20 side. An adhesive may be applied to both the dish 11 and the polishing sheet 20.

(Modification)
In the first embodiment, the thickness T _y of the polishing sheet 20 is made uniform and final by using the auxiliary plate 41 whose curvature radius R _b is smaller than the curvature radius R _d of the polishing plate 11. It was made to be thicker than the _{T k} (step S13). However, depending on the shape of the lens polishing dish 1 to be produced, the polishing table 11 may be used instead of the spare table 41.

In this case, when the polishing sheet member 24 formed into a corolla shape is curved, as shown in FIG. 10, the polishing table plate 11 is placed at a predetermined position P (the polishing table plate 11 and the mold plate 30 with respect to the concave portion 33 of the mold plate 30. pushed up to a position shallower than the gap becomes uniform thickness T _k positions) between. Thereby, in the center 24a of the polishing sheet member 24, the thickness T _y after compression becomes thicker than the final thickness T _k .

At this time, the thickness of the polishing sheet member 24 gradually decreases from the center 24a of the polishing sheet member 24 toward the end. However, in the region D in the vicinity of the center 24a (in the range where the thickness is thicker than T _s ), the difference in thickness is not so remarkable, so that the portion of this region D can be used as the polishing sheet 20. This is because the difference in thickness can be absorbed by compression when the polishing sheet 20 is stuck to the polishing table 11.

  Thus, when the curve of the lens polishing dish 1 is shallow (when the area used for polishing is small with respect to the radius of curvature), a spare base plate 41 (preliminary tool 40) is separately provided for the production of the polishing sheet 20. No need to prepare.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. 11A and 11B are diagrams illustrating a method for manufacturing a polishing sheet according to Embodiment 2. FIG.
In the lens polishing dish preparation apparatus 50 shown in FIG. 11A, a mold dish 37 provided with a recess 38,
A spare base 45 and a spare tool 45 including a support 47 are attached. The radius of curvature R _e of the pressing surface 48 of the preliminary tray 46 is a size obtained by subtracting the thickness T _y of the polishing sheet 20 (see FIG. 2) from the radius of curvature R _k of the sheet forming surface 39 in the recess 38. Yes. In addition, a flange portion 49 that protrudes in the outer peripheral direction and circulates is provided on the upper portion of the auxiliary tray 46.

A ring-shaped spacer (spacer) 60 is installed on the mold plate 37 so as to surround the recess 38. As shown in FIG. 11B, the spacer 60, at the time of pressing the polishing sheet member 24 having a thickness of T _s by the preliminary Thai sala 46, constant thickness T _y between the seat forming surface 39 and the pressing surface 48 The flange portion 49 is supported so as to ensure a sufficient space.

  According to the second embodiment described above, since the sheet forming surface 39 and the pressing surface 48 can be held at a constant interval, it is possible to easily and accurately produce the polishing sheet 20 having a uniform thickness. It becomes possible. Therefore, it becomes possible to polish optical elements such as lenses with high accuracy by using a lens polishing dish to which such a polishing sheet is attached.

Further, according to the second embodiment, since the control of the thickness T _y of the abrasive sheet 20 is facilitated, the thickness T _y in advance the polishing sheet 20, the final thickness after application of the grinding stand dish 11 is by keeping close to T _k, the deformation of the abrasive sheet 20 to be reduced as much as possible at the time of sticking, further it becomes possible to suppress the abrasive sheet 20 of the peeling and gap ends generated from the lens polisher 1.

(Embodiment 3)
Next, a third embodiment of the present invention will be described. 12A to 12D are views for explaining a method for producing a lens polishing dish according to Embodiment 3. FIG. In Embodiment 3, a lens polishing dish for polishing convex lenses is produced. The method for producing the polishing sheet 20 is the same as in the first or second embodiment.

  First, as shown in FIG. 12A, a polishing plate 70 provided with a recess 72 having a concave polishing surface (polishing sheet attaching surface) 71 is attached to the mold tray receiver 54 of the lens polishing plate preparation apparatus 50, A mold plate 80 having a convex sheet forming surface 81 corresponding to the polishing surface 71 is disposed above. At this time, the mold plate 80 may be held by an operator's hand or a guide (not shown). Further, the final target value (the value of the scale 59a) when rotating the operation unit 58 is acquired in advance in the same manner as described in step S22.

  Subsequently, as shown in FIG. 12B, an adhesive 82 is applied to the polishing surface 71, and the polishing sheet 20 is arranged in the recess 72 so that the center 20 a thereof substantially coincides with the center axis O of the polishing table 70. To do. At this time, a part of the polishing sheet 20 may protrude from the recess 72. Further, instead of the polishing surface 71, the adhesive 82 may be applied to the polishing sheet 20 side, or the adhesive 82 may be applied to both the polishing surface 71 and the polishing sheet 20.

  Then, the polishing surface 71 and the sheet molding surface 81 are brought into contact with both surfaces of the polishing sheet 20 by rotating the operation unit 58 to move the mold plate 80 downward. Then, as shown in FIG. 12C, the adhesive 82 is cured while the polishing sheet 20 is compressed by the polishing table plate 70 and the mold plate 80. At this time, the polishing sheet 20 may be heated at a predetermined temperature for a predetermined time in accordance with conditions such as the material of the polishing sheet 20, the compression amount, and the type of adhesive. In addition, the dashed-two dotted line of FIG. 12C has shown the polishing sheet 20 before compression.

  After the adhesive 82 is cured (when the polishing sheet 20 is heated, after the heating is stopped and the polishing sheet 20 is cooled to room temperature), the mold plate 80 is pulled upward as shown in FIG. 12D. Thereby, the spherical shape of the sheet molding surface 81 is transferred, and the lens polishing dish 2 in which the polishing sheet 20 compressed to a desired thickness is attached to the polishing table 70 is completed.

  According to the third embodiment described above, the positional deviation of the polishing sheet 20 with respect to the polishing surface 71 can also be suppressed in the lens polishing dish 2 for polishing convex lenses. Therefore, a situation in which a part of the polishing surface 71 is exposed can be prevented. Therefore, by using such a lens polishing dish, it is possible to stably and accurately polish an optical element such as a convex lens.

  The lens polishing dish preparation apparatus 50 used in the first to third embodiments is not limited to the above-described form. For example, the positional relationship (vertical relationship) between the mold plate 30 and the polishing plate substrate 10 is reversed, the polishing sheet 20 is placed on the polishing table plate 11, and the polishing plate 20 is covered with the concave portion 33 of the mold plate 30. It is good also as a form which presses the polishing sheet 20 toward the polishing stand plate 11.

DESCRIPTION OF SYMBOLS 1 Lens polishing dish 10 Polishing dish base | substrate 11,70 Polishing base plate 11a, 71 Polishing surface 11b Center of polishing surface 12,42,47 Support part 13 Plane part 14,44 Receiving part 15,82 Adhesive 20,90 Polishing sheet 20a 90a Abrasive sheet center 21 Peripheral part 22 Incision 23 Corolla-shaped center part 24 Abrasive sheet member 24a Abrasive sheet member center 30, 37, 80 Mold dish 31 Dish part 32 Leg part 33, 38, 72 Recessed part 34, 39, 81 Sheet forming surface 35 Flat portion 36 Screw portion 40, 45 Spare tool 41, 46 Spare plate 43, 48 Pressing surface 49 Flange portion 50 Lens polishing pan preparation device 51 First support member 52 Second support member 53 Connecting member 54 Type Countersink 55 Screw ring 55a Index 56 Press rod 56a Recessed portion 57 Hard ball 58 Operation unit 59 Scale ring 59a Scale 6 Spacer

Claims (4)

A polishing sheet having a crown shape in which a peripheral portion is divided into a plurality of petals by a plurality of cuts made from the outer peripheral side toward the center, wherein the peripheral portion is curved by thermoplastic deformation. A step of applying an adhesive to at least one of the first surface and the first curved surface provided on the lens polishing platform, ( a );
A first curved surface and a second curved surface provided on a polishing plate forming mold plate, the second curved surface having a shape in which irregularities are inverted with respect to the first curved surface; of direct the curved surface of the direction which forms a concave upward, the side on which the center portion of the front Symbol Migaku Ken sheet protrudes toward the curved surface of the direction which forms the concave, the abrasive sheet towards forming the concave The polishing sheet is disposed above the curved surface, and further, the polishing sheet is formed into the concave curved surface through the convex curved surface of the first curved surface and the second curved surface. The step of bringing the one surface of the polishing sheet into contact with the first curved surface through the adhesive and pressing the other surface of the polishing sheet into the second curved surface by pressing. ( B ),
Curing the adhesive in a state where the abrasive sheet is in contact with the first and second curved surfaces ( c );
A method for producing a lens polishing dish comprising: Wherein step (c), the abrasive sheet, being in contact with the first and second curved surfaces, in claim 1, wherein the heating at a temperature lower than the melting point of the abrasive sheet The manufacturing method of the lens polishing dish of description. The method for producing a lens polishing dish according to claim 1 or 2 , wherein the step ( c ) compresses the polishing sheet. The lens polishing dish according to any one of claims 1 to 3 , wherein the polishing sheet is curved using a mold having a curved surface having the same shape as the second curved surface. Manufacturing method.

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