JP5734721B2 - Lens polishing dish manufacturing apparatus and manufacturing method - Google Patents

Description

  The present invention relates to a lens polishing plate manufacturing apparatus and a manufacturing method for manufacturing a lens polishing plate in which a polishing sheet is attached to a polishing table.

  Polishing a lens or the like is performed using a lens polishing dish having a polishing surface having a shape (for example, a spherical shape) corresponding to the final finished surface of a lens member to be polished. The lens polishing dish is used to attach a polishing sheet made of a material that has a polishing action, such as a foamed polyurethane or foamed polyester material, to a base plate that has a spherical convex or concave part. It is produced by pasting with an agent and pressing the polishing sheet using a mold plate for polishing surface molding. By this pressing, the polishing sheet comes into close contact with the base plate and is compressed, and a polished surface having a curvature along the mold plate is formed.

  When manufacturing such a lens polishing dish, it is important to apply a uniform pressing force to the polishing sheet and compress it to a uniform thickness. For this reason, for example, in Patent Document 1, it is made of a cap-shaped cylinder, and by providing a pressing member fitted around the shaft portion of the lens polishing plate, the inclination of the lens polishing plate is prevented, A pressing force corresponding to the amount of movement of the pressing member is equally applied to the polishing sheet.

JP 2001-252855 A

  However, in the conventional method for producing a lens polishing dish, even if a constant pressing force is applied to the lens polishing dish, the thickness and surface shape of the compressed abrasive sheet may vary. Specifically, even if the position of the pressing member in the compression direction is adjusted in consideration of the desired amount of compression, a portion where the thickness becomes thinner than intended is generated in the compressed abrasive sheet, and the thickness is made uniform. It was difficult. Therefore, depending on conditions such as the shape and size of the plate and the material of the polishing sheet, the spherical shape of the lens polishing plate will vary, making it difficult to efficiently produce a stable lens polishing plate. was there.

  The present invention has been made in view of the above, and regardless of conditions such as the shape and size of the platen and the material of the polishing sheet, the thickness of the molded polishing sheet is uniform and the surface shape varies. It is an object of the present invention to provide a lens polishing dish preparation apparatus and a manufacturing method capable of producing a lens polishing dish having a stable quality without any problems.

  In order to solve the above-described problems and achieve the object, a lens polishing dish preparation device according to the present invention is a lens polishing dish preparation device for manufacturing a lens polishing dish used for polishing a spherical lens. A mold plate provided with a polishing surface molding surface having a spherical shape corresponding to the finished surface, and a polishing sheet application surface to which the polishing sheet is attached, and having a spherical shape corresponding to the polishing surface molding surface A polishing table provided with a surface, a pressing mechanism that presses the polishing table toward the polishing surface molding surface, and an interval maintenance that maintains a constant distance between the polishing surface molding surface and the polishing sheet application surface. Means.

  In the lens polishing plate manufacturing apparatus, the interval maintaining means is a spacer disposed between a polishing plate base provided at a tip of the polishing plate and the mold plate or a mold plate holder that supports the mold plate. The spacer is arranged on the outer peripheral side of the polishing surface molding surface and the polishing sheet attaching surface.

  In the lens polishing dish manufacturing apparatus, the interval maintaining means is a spacer that contacts the polishing sheet attaching surface and the polishing surface molding surface.

  In the lens polishing plate manufacturing apparatus, the interval maintaining means is a spacer disposed between a polishing plate base provided at a tip of the polishing plate and the mold plate or a mold plate holder that supports the mold plate. A mold platen side spacer contact surface that contacts the spacer is provided on the outer peripheral side of the polishing surface molding surface, and the spacer includes the polishing sheet attaching surface and the mold plate side spacer. It abuts on the abutment surface.

  In the lens polishing plate manufacturing apparatus, the interval maintaining means is a spacer disposed between a polishing plate base provided at a tip of the polishing plate and the mold plate or a mold plate holder that supports the mold plate. A platter-side spacer contact surface that contacts the spacer is provided on the outer peripheral side of the polishing sheet attaching surface, and the spacer includes the polishing surface molding surface and the platter-side spacer. It abuts on the abutment surface.

  In the lens polishing dish manufacturing apparatus, the spacer is arranged around a point on an axis passing through the spherical center of the polishing surface molding surface and the spherical center of the polishing sheet attaching surface.

  The lens polishing dish preparation method according to the present invention is a lens polishing dish used for polishing a spherical lens, and in the lens polishing dish preparation method for manufacturing a lens polishing dish in which a polishing sheet is attached to a polishing table, the spherical lens An interval maintaining means for maintaining a constant distance between the polishing sheet application surface of the polishing table and the polishing surface molding surface on a mold plate provided with a polishing surface molding surface having a spherical shape corresponding to the final finished surface of A spacer placement step of placing the polishing sheet, a polishing sheet placement step of placing the polishing sheet on the polishing surface molding surface, the polishing sheet application surface, and the surface of the polishing sheet facing the polishing sheet application surface A pressing step in which an adhesive is applied to at least one of the inner plates, the polishing table is directed to the polishing surface molding surface by a pressing mechanism, and pressed until the spacer contact surface on the polishing table plate side contacts the spacer. When, While compressing the abrasive sheet serial abrasive sheet attachment surface and by the said polishing surface molding surface, characterized in that it comprises an adhesive curing step of curing the adhesive.

  According to the present invention, when the polishing sheet is pressed by the polishing table and the mold plate, the distance maintaining means for maintaining a constant distance between the polishing sheet attaching surface and the polishing surface molding surface is provided. Regardless of the conditions such as the size, the material of the polishing sheet, etc., it is possible to produce a lens polishing dish having no variation in the thickness and surface shape of the molded polishing sheet.

FIG. 1 is a partial cross-sectional view showing a lens polishing dish manufacturing apparatus according to Embodiment 1. FIG. 2 is an enlarged cross-sectional view of a part of the lens polishing dish preparation apparatus shown in FIG. FIG. 3 is a perspective view showing the appearance of the polishing dish substrate shown in FIG. FIG. 4 is a perspective view showing the appearance of the mold plate shown in FIG. FIG. 5 is a partially sectional perspective view in which the spacer shown in FIG. 1 is enlarged. FIG. 6 is a plan view showing an abrasive sheet formed into a corolla shape. FIG. 7 is a flowchart showing the lens polishing dish manufacturing method according to the first embodiment. FIG. 8A is a diagram for explaining a lens polishing dish manufacturing method. FIG. 8B is a diagram for explaining a lens polishing dish manufacturing method. FIG. 8C is a diagram illustrating a lens polishing dish manufacturing method. FIG. 8D is a diagram for explaining a lens polishing dish manufacturing method. FIG. 8E is a diagram for explaining a lens polishing dish manufacturing method. FIG. 9 is a cross-sectional view showing a part of the lens polishing dish preparation apparatus according to Modification 1-1. FIG. 10 is a cross-sectional view showing a part of the lens polishing dish preparation apparatus according to the second embodiment. FIG. 11 is a partially sectional perspective view in which the spacer shown in FIG. 10 is enlarged. FIG. 12 is a cross-sectional view showing a part of a lens polishing dish preparation apparatus according to Modification 2-1. FIG. 13 is a cross-sectional view showing a part of a lens polishing dish preparation apparatus according to Modification 2-3. FIG. 14 is a perspective view showing the auxiliary dish shown in FIG. FIG. 15 is a cross-sectional view showing a part of the lens polishing dish preparation apparatus according to the third embodiment. 16 is a partially sectional perspective view in which the spacer shown in FIG. 15 is enlarged. FIG. 17 is a cross-sectional view showing a part of a lens polishing dish manufacturing apparatus according to Modification 3. 18 is a partially sectional perspective view in which the spacer shown in FIG. 17 is enlarged. FIG. 19 is a cross-sectional view showing a part of the lens polishing dish preparation apparatus according to the fourth embodiment. 20 is a partial cross-sectional perspective view in which the spacer shown in FIG. 19 is enlarged. FIG. 21 is a cross-sectional view showing a part of a lens polishing dish manufacturing apparatus according to Modification 4. 22 is a partial cross-sectional perspective view in which the spacer shown in FIG. 21 is enlarged. FIG. 23 is a partial cross-sectional view showing the lens polishing dish manufacturing apparatus according to the fifth embodiment.

  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 partial cross-sectional view showing a lens polishing dish manufacturing apparatus according to Embodiment 1 of the present invention. FIG. 2 is an enlarged cross-sectional view of a part of the lens polishing dish preparation apparatus 1 shown in FIG. As shown in FIGS. 1 and 2, a lens polishing dish preparation device 1 according to Embodiment 1 is an apparatus for manufacturing a lens polishing dish used for polishing spherical lenses, and a polishing table dish to which a polishing sheet is attached. 11 is provided with a polishing dish base 10 provided with 11, a mold dish 20, a spacer 30 disposed between the polishing table dish 11 and the mold dish 20, and a pressing mechanism 40.

  FIG. 3 is a perspective view showing the appearance of the polishing dish base 10 and is upside down with respect to FIG. As shown in FIG. 3, the polishing dish base 10 includes a polishing table dish 11, a shaft part 12 that supports the polishing table dish 11, and a spacer receiving part 13 provided on a side surface of the shaft part 12. Such a polishing dish base 10 is integrally formed of an alloy such as brass or stainless steel.

The polishing table 11 has a polishing sheet sticking surface (hereinafter also simply referred to as a sticking surface) 11a to which the polishing sheet 50 is stuck. The affixing surface 11a has a spherical shape corresponding to the final finished surface of the lens member to be polished (for example, a convex spherical shape when a concave lens is polished). Moreover, the radius of curvature of the application surface 11a, rather than the radius of curvature of the mold sheet shaping surface of the dish 20 (polishing surface molding surface) 23a which will be described later, is designed so that only smaller amount of the thickness T _k of the abrasive sheet 50 (See FIG. 2). A lens polishing dish is manufactured by sticking the polishing sheet 50 to such a sticking surface 11 a and compressing the polishing sheet 50 together with the mold dish 20. The abrasive sheet 50 is a sheet-like abrasive member made of a member obtained by impregnating a porous material such as foamed polyurethane or foamed polyester with an abrasive or other members having a polishing action.

The spacer receiving part 13 is a disk-shaped member provided so as to protrude outward from the outer edge of the sticking surface 11a. Of the surface of the spacer receiving portion 13 on the side of the polishing table 11, a portion on the outer peripheral side of the pasting surface 11 a is a table-side spacer contact surface 13 a that contacts the spacer 30.
The spacer receiving portion 13 is arranged at a distance d from the polishing table 11. This prevents the spacer receiving part 13 from interfering with polishing during polishing.

  The shaft portion 12 is used when the polishing dish base 10 is attached to the pressing mechanism 40. The shaft portion 12 has a substantially cylindrical shape, and a concave receiving portion 12 a is provided at the center of the bottom surface of the shaft portion 12 on the side opposite to the polishing table 11.

  FIG. 4 is a perspective view showing the appearance of the mold plate 20. The mold tray 20 is a mold for molding a polished surface (sheet molding), and is formed of a metal or alloy such as iron or stainless steel, for example. As shown in FIG. 4, the mold tray 20 includes a disk-shaped dish portion 21 and leg portions 22 that support the dish portion 21.

  A concave portion 23 is provided at the center of the upper surface of the plate portion 21 in the figure. The inner wall surface of the recess 23 has a spherical shape corresponding to the final finish surface of the lens member to be polished (the curvature radius is equal to the final finish surface), and the surface shape of the polishing sheet 50 attached to the application surface 11a. The sheet forming surface 23a is formed. The sheet molding surface 23a is a polishing surface molding surface that molds the surface of the polishing sheet 50 to be polished in contact with a spherical lens that is a member to be polished. In Embodiment 1, the area of the sheet molding surface 23a is larger than that of the pasting surface 11a. The flat surface around the recess 23 is a mold plate side spacer contact surface 21a.

  The leg portion 22 has a cylindrical shape, and a screw portion 24 for fitting the mold tray 20 to the mold tray receiver 44 that supports the mold tray 20 is provided on a side surface of the leg portion 22. On the outer peripheral side surface of the plate portion 21, there is a flat portion 25 that is partially cut into a flat shape so as to fit a spanner or the like when the mold plate 20 is screwed into the mold plate holder 44 or released. For example, it is provided in two places.

  FIG. 5 is a partial cross-sectional perspective view showing the spacer 30. The spacer 30 is an interval maintaining unit that maintains a constant interval between the application surface 11a and the sheet molding surface 23a, and is disposed on the outer peripheral side of the application surface 11a and the polishing surface molding surface 23a. As shown in FIG. 5, the spacer 30 includes a ring portion 32 having a cylindrical opening 31 in the center, and a stopper portion provided on the outer peripheral side of one bottom surface (lower surface in the drawing) 32 b of the ring portion 32. 33.

The upper surface 32a and the lower surface 32b of the ring portion 32 are flat, and the flat portions are in contact with the platen side spacer contact surface 13a and the platen side spacer contact surface 21a, respectively.
The thickness W of the ring portion 32, the distance between the center C of the attaching surface 11a and the base pan side spacer abutment surface 13a, and is determined based on the target value T _k thickness to compress the abrasive sheet 50 . The diameter D of the opening 31 is equal to or larger than the diameter when the polishing sheet 50 is curved along the sheet forming surface 23a, and preferably equal to or larger than the diameter when the polishing sheet 50 is planar.

  When the spacer 30 is placed on the mold plate 20, the stopper 33 is positioned by causing the inner circumferential surface 33a to abut the upper surface of the mold plate 20 and restricting the movement of the spacer 30 in the horizontal direction. Prevent misalignment.

  The pressing mechanism 40 includes a first support member 41 that is a horizontally disposed base, a second support member 42 that is disposed in parallel above the first support member 41, and first and second supports thereof. It has a forming frame body including columnar connecting members 43 which are planted and fixed on both sides of the opposing surfaces of the members 41 and 42 and connect the first and second support members 41 and 42 to each other. A cylindrical mold tray holder 44 having a female screw engraved on the inner peripheral surface thereof is fixed at a substantially central portion on the first support member 41, and the polishing plate tray 11 is paired with the mold tray receiver 44. An eggplant mold 20 is screwed and attached. At the time of manufacturing the lens polishing dish, the polishing sheet 50 is placed in the recess 23 provided in the mold dish 20, and the polishing sheet 50 is pressed from above by the polishing table 11 coated with an adhesive. .

  A screw ring 45 having an inner peripheral surface engraved with a female screw is fitted and fixed to a substantially central portion of the second support member 42. A press rod 46 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 45. A lower portion (substantially lower half) of the pressing rod 46 protrudes from the lower surface of the second support member 42. The lower end surface of the pressing rod 46 is an opposing surface of the rigid sphere 47 disposed on the receiving portion 12a of the polishing dish base 10 when the lens polishing dish is manufactured. A recess 46 a is provided at the lower end surface of the pressing rod 46, and the polishing dish base 10 can be stably pressed via the hard sphere 47.

  The upper end of the pressing rod 46 protrudes from the screw ring 45, and the operation portion 48 is integrally fixed to the protruding end portion. By rotating the operation portion 48, the pressing rod 46 moves up and down in the screw ring 45. Moreover, the operation part 48 is formed in the square (for example, hexagon) which is easy to operate.

  In such a lens polishing dish manufacturing apparatus 1, the polishing dish substrate 10, the mold dish 20, and the spacer 30 are arranged so that the central axes thereof coincide with each other.

Here, in Embodiment 1, the reason why the spacer 30 is provided in the lens polishing dish manufacturing apparatus 1 is as follows.
The inventors of the present application have intensively studied the reason why the thickness of the compressed abrasive sheet varies when a certain pressing force is applied to the polishing table plate in a general lens polishing plate manufacturing method. As a result, the inventors of the present application have conceived that the weight of the polishing plate is not controlled during the formation of the polishing sheet. That is, when pressing the polishing sheet, the uncontrolled polishing plate's own weight is given to the polishing sheet, and the polishing sheet continues to be excessively compressed by this own weight, and the thickness becomes thinner than intended, Variations in thickness occur.

Therefore, the inventor of the present application provides a spacer 30 that keeps the distance between the bonding surface 11a and the sheet molding surface 23a at a constant value, and receives the weight of the polishing dish base 10 in the spacer 30 to apply the spacer to the bonding surface 11a. abrasive sheet 50 to be the leading to the completion of the present invention of preventing from being compressed beyond a predetermined thickness T _k. As a result, the entire polishing sheet 50 can be uniformly compressed to the thickness _Tk .

Next, the lens polishing dish preparation method according to Embodiment 1 will be described.
First, a polishing sheet 50 to be attached to the polishing table 11 is prepared as advance preparation. As shown in FIG. 6, the polishing sheet 50 has a corolla shape in which a plurality of cuts 52 are made from a circular outer peripheral side toward the center and the peripheral portion 51 is divided into a plurality of petals. Such an abrasive sheet is produced by cutting a sheet made of a member obtained by impregnating a polishing material into a porous material such as foamed polyurethane or foamed polyester or other members having a polishing action into the above-mentioned crown shape. At this time, the shape and length of the cut 52 are determined based on a shape obtained by developing the spherical shape of the pasting surface 11a.

In addition, the polishing sheet member in the state before making the notch 52 should just have the shape and size which can cover the sticking surface 11a to an edge, when the polishing sheet 50 is stuck to the polishing stand 11. . Specifically, it is sufficient that the shape and size include at least a circle whose radius is the length of the meridian connecting the center of the sticking surface 11a and the edge of the sticking surface 11a. It may be a circular shape with a large diameter, a polygon inscribed in or including the circular shape, and the like. The portion that protrudes from the edge of the attaching surface 11a when the polishing sheet 50 is attached to the polishing table 11 can be cut off after application.
In addition, the thickness of the polishing sheet 50 at this stage is set to be thicker than the final thickness T _k when being attached to the polishing table 11 in consideration of being compressed in a subsequent process.

FIG. 7 is a flowchart showing a lens polishing dish manufacturing method.
First, in step S1, as shown in FIG. 8A, a spacer 30 is arranged on the mold plate 20. Specifically, the spacer 30 is fitted to the mold plate 20 so that the axis passing through the center of curvature Q (spherical center) of the pasting surface 11a and the sheet molding surface 23a passes through the center O of the opening 31.

  In the subsequent step S2, as shown in FIG. 8B, the polishing sheet 50 is disposed on the recess 23 of the mold plate 20 from the opening 31 of the spacer 30.

  In step S3, as shown in FIG. 8C, the polishing table 11 in which the adhesive 55 such as epoxy resin is applied to the pasting surface 11a is attached to the pressing mechanism 40. At this time, the polishing dish base 10 is preferably held by the operator's hand or a guide (not shown).

  In step S <b> 4, the polishing dish base 10 is moved downward by rotating the operation unit 48, the polishing table 11 is pressed against the polishing sheet 50, and the table-side spacer contact surface 13 a is the upper surface of the spacer 30. Press until it abuts against 32a (see FIG. 8D). Thereby, the polishing sheet 50 is compressed between the pasting surface 11a and the sheet forming surface 23a. In FIG. 8D, the description of the adhesive 55 is omitted.

  In step S5, the adhesive 55 is cured by holding the polishing sheet 50 for a predetermined time while being compressed. At this time, the polishing sheet 50 may be heated according to conditions such as the material of the polishing sheet 50, the amount of compression, and the type of adhesive. In Embodiment 1, the lens polishing dish preparation apparatus 1 in the state shown in FIG. 8D is left in an atmosphere of about 200 ° C. for about 40 minutes. As a result, the polishing sheet 50 is plastically deformed, and the partial strain generated by bending the polishing sheet 50 along the sheet forming surface 23a is removed or made uniform.

In step S6, after the adhesive is cured (when the polishing sheet 50 is heated, after the heating is stopped and the polishing sheet 50 is cooled to room temperature), the operation unit 48 is rotated as shown in FIG. 8E. By operating the pressure rod 46, the polishing plate base 10 is released from the mold plate 20. Thereby, the spherical shape of the sheet molding surface 23a is transferred, and the lens polishing dish 2 in which the polishing sheet 50 compressed to a desired thickness is attached to the polishing table 11 is completed.
In addition, when the polishing sheet 50 having a large size with respect to the sticking surface 11a is used, the portion of the polishing sheet 50 that protrudes from the sticking surface 11a may be cut off at this stage.

(Example)
An experiment was performed in which the polishing sheet 50 having a thickness of 0.56 mm was attached to the polishing table 11 and the lens polishing plate 2 was produced with a target thickness value after compression of 0.5 mm. As an example, in the case where the spacer 30 which maintains the space | interval of the sticking surface 11a and the sheet | seat shaping | molding surface 23a at 0.5 mm is arrange | positioned on the type | mold plate 20, and the case where the spacer 30 is not arrange | positioned as a comparative example, Ten lens polishing dishes 2 were produced. As a result, in the comparative example, thickness variation occurred in a range of about 16%. On the other hand, in the example, the thickness variation could be suppressed to 2%.

  As described above, in the first embodiment, the weight of the polishing dish base 10 is received by the spacer 30 that keeps the distance between the sticking surface 11 a and the sheet molding surface 23 a constant, and the polishing sheet is self-weighted. 50 is prevented from being over-compressed. For this reason, the polishing sheet 50 affixed to the polishing table 11 can be uniformly compressed to a desired thickness, and the spherical shape of the sheet molding surface 23a can be accurately transferred to the polishing sheet 50. Therefore, even when a plurality of lens polishing dishes are manufactured, it is possible to suppress variations in the thickness and surface shape of the molded polishing sheet 50. By using such a lens polishing dish, an optical element such as a convex lens can be stably and accurately polished.

  Further, according to the first embodiment, the thickness of the compressed abrasive sheet 50 can be easily controlled by adjusting the thickness of the spacer 30.

  Further, according to the first embodiment, the positional relationship between the polishing table 11 and the mold plate 20 is determined by bringing the table-side spacer contact surface 13a into contact with the upper surface 32a of the spacer 30. The operation of rotating the operation unit 48 while adjusting the position of the pressing rod 46 while reading the scale is unnecessary, and the operation with respect to the pressing mechanism 40 becomes easy.

  Furthermore, according to the first embodiment, it is possible to manufacture a highly accurate lens polishing dish with a simple configuration in which a spacer is arranged with respect to a normal lens polishing dish manufacturing apparatus.

  In the above description, the diameter of the sticking surface 11a is made smaller than the sheet molding surface 23a, and the lens polishing dish 2 having the polishing sheet 50 attached to the entire sticking surface 11a is produced. The polishing sheet 50 can be compressed and molded regardless of the size relationship between the affixing surface 11 a and the sheet molding surface 23 a and the size of the polishing sheet 50.

  Further, when the polishing sheet 50 is peeled off from the polishing table 11 after the lens polishing plate 2 is used, an epoxy resin adhesive is dissolved by trichlene solution cleaning, ultrasonic cleaning or the like, and the affixing surface 11a is made of ether or alcohol. What is necessary is just to wipe away with liquid mixtures, such as.

(Modification 1-1)
Next, Modification 1-1 of Embodiment 1 will be described. FIG. 9 is a cross-sectional view showing a part of the lens polishing dish preparation apparatus according to Modification 1-1.
As shown in FIG. 9, the lens polishing dish preparation device according to Modification 1-1 includes a polishing table dish 110 having a concave spherical surface pasting surface 111, and a convex spherical sheet forming corresponding to the pasting surface 111. A mold plate 120 having a surface 121 and a spacer 130 are provided. The mold tray 120 is screwed to the mold tray receiver 44 at a screw portion 123 provided on the leg portion 122. Spacer 130 is disposed between the grinding stand dish 110 and the mold pan support 44 to keep the distance between the attachment surface 111 and the sheet forming surface 121 to a constant value T _k.

  The spacer 130 includes a ring portion 132 provided with a cylindrical opening 131 in the center, and a stopper portion 133 provided on the outer peripheral side of one bottom surface (lower surface in the drawing) 135 of the ring portion 132. The upper surface 134 and the lower surface 135 of the ring portion 132 abut against the flat surface portion 112 around the affixing surface 111 of the polishing table 110 and the upper surface 44a of the mold tray receiver 44 to which the mold plate 120 is screwed. The diameter of the opening 131 is equal to or larger than the diameter when the polishing sheet 50 is curved along the sheet forming surface 121, and preferably equal to or larger than the diameter when the polishing sheet 50 is planar.

The stopper 133 restricts the movement of the spacer 130 in the horizontal direction by bringing the inner peripheral surface 136 into contact with the upper part of the side surface of the mold tray receiver 44 when the spacer 130 is disposed on the mold tray receiver 44. To prevent misalignment.
Such a spacer 130 is fitted to the mold plate 120 so that the axis passing through the center of curvature Q of the sticking surface 111 and the sheet molding surface 121 passes through the center O of the opening 131.

According to this modification 1-1, even if the sticking surface 111 has a concave spherical shape, the spacer 130 sets the interval between the sticking surface 111 and the sheet molding surface 121 to a constant value T _k. Can be maintained. Accordingly, the polishing sheet 50 is prevented from being excessively compressed by the weight of the polishing table 110, the polishing sheet 50 is uniformly compressed to a desired thickness, and the spherical shape of the sheet molding surface 121 is changed to the polishing sheet 50. It becomes possible to transfer accurately. Therefore, even when producing a plurality of lens polishing dishes, it is possible to suppress variations in the thickness and surface shape of the molded polishing sheet 50.

  Moreover, also in this modified example 1-1, it becomes possible to perform compression and shaping | molding of the polishing sheet 50 irrespective of the magnitude relationship of the diameter of the sticking surface 111 and the sheet forming surface 121, and the magnitude | size of the polishing sheet 50. .

(Modification 1-2)
In the first embodiment, the spacer formed integrally in the ring shape is used, but a spacer combining a plurality of members may be used. For example, a plurality of arc-shaped members having the same height can be used as a spacer by disposing them at a predetermined interval on the mold platen-side spacer contact surface 21a.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. FIG. 10 is a cross-sectional view showing a part of the lens polishing dish preparation apparatus according to the second embodiment.
As shown in FIG. 10, the lens polishing dish preparation device according to the second embodiment includes a polishing table dish 210 having a convex spherical-shaped polishing sheet application surface (hereinafter simply referred to as an application surface) 211, and an application surface 211. comprising a mold dish 220 having a sheet shaping surface 221 of the corresponding concave spherical surface shape and a spacer 230 as the interval maintaining means for maintaining the spacing between the attachment surface 211 and the sheet forming surface 221 to a constant value T _k. In addition, about the structure of the whole lens polishing dish preparation apparatus containing the press mechanism 40, it is the same as that of what is shown in FIG.

  FIG. 11 is an enlarged partial cross-sectional perspective view showing the spacer 230. As shown in FIG. 11, the spacer 230 has a ring shape in which a cylindrical opening 231 is provided at the center. The upper surface (upper surface) 232 in the spacer diagram has a concave spherical shape corresponding to the pasting surface 211 (that is, has the same curvature as the pasting surface 211), and the upper surface 232 is the periphery of the pasting surface 211. It abuts on the part 212. On the other hand, the lower surface (lower surface) 233 of the spacer 230 has a convex spherical shape corresponding to the sheet molding surface 221 (that is, having the same curvature as the sheet molding surface 221). 233 contacts the peripheral edge 222 of the sheet forming surface 221.

When producing a lens polishing dish, first, the spacer 230 is arranged on the mold dish 220 so that the axis passing through the center of curvature Q of the sticking surface 211 and the sheet molding surface 221 passes through the center O of the opening 231. . Then, the polishing sheet 50 is disposed on the sheet molding surface 221 from the opening 231. Further, the polishing table 210 with the adhesive applied to the application surface 211 is pressed against the polishing sheet 50 and pressed until the application surface 211 comes into contact with the upper surface 232 of the spacer 230. As a result, the polishing sheet 50 is affixed to the polishing table 210 and compressed to the thickness T _k , and the spherical shape corresponding to the sheet molding surface 221 is transferred to the polishing sheet 50.

  As described above, according to the second embodiment, the spacer 230 is provided between the affixing surface 211 and the sheet molding surface 221 so as to keep the distance between them constant. Excessive compression to 50 can be prevented. Thereby, the polishing sheet 50 can be uniformly compressed to a desired thickness, and the spherical shape of the sheet molding surface 221 can be accurately transferred to the polishing sheet 50. Therefore, even when producing a plurality of lens polishing dishes, it is possible to suppress variations in the thickness and surface shape of the molded polishing sheet 50.

  Further, according to the second embodiment, the spacer 230 having the spherical contact surfaces (the upper surface 232 and the lower surface 233) corresponding to the pasting surface 211 and the sheet molding surface 221 is disposed between the two, so that the sheet molding is performed. It is possible to always match the axis passing through the center of curvature of the surface 221 and the axis passing through the center of curvature of the pasting surface 211.

  Further, according to the second embodiment, since the entire polishing sheet 50 is compressed between the sticking surface 211 and the sheet forming surface 221, it is uniformly compressed to the end of the polishing sheet 50 and the end of the polishing sheet 50 is compressed. Can be brought into close contact with the pasting surface 211. Accordingly, it is possible to suppress peeling from the sticking surface 211 at the end of the polishing sheet 50.

  Further, according to the second embodiment, since the spacer 230 is directly disposed between the sticking surface 211 and the sheet forming surface 221, the relationship between the thickness of the polishing sheet 50 and the height of the spacer 230 becomes clear. The design and selection of the seat 230 are facilitated.

  According to the second embodiment, if the curvatures of the affixing surface 211 and the sheet molding surface 221 are common, the common spacer 230 is used regardless of the size of the affixing surface 211 and the sheet molding surface 221. it can.

(Modification 2-1)
FIG. 12 is a cross-sectional view showing a part of a lens polishing dish preparation apparatus according to Modification 2-1. In the modified example 2-1, a ring-shaped spacer 330 having a circular cross-sectional shape is disposed between the sticking surface 211 and the sheet forming surface 221. Thus, as a cross-sectional shape of the spacer, there are various shapes without particular limitation as long as it has regions that are in contact with the affixing surface 211 and the sheet molding surface 221 and the distance between the two can be kept constant. Can be applied.

(Modification 2-2)
As a spacer disposed between the sticking surface 211 and the sheet molding surface 221, a plurality of members having a certain height may be used instead of the spacer 330 integrally formed in a ring shape. In this case, what is necessary is just to determine the position of a some member so that the axis | shaft which passes along the curvature center Q of the sticking surface 211 and the sheet | seat molding surface 221 may pass the center of these some members.

(Modification 2-3)
FIG. 13 is a cross-sectional view showing a part of a lens polishing dish preparation apparatus according to Modification 2-3.
As shown in FIG. 13, the lens polishing dish preparation device according to Modification 2-3 includes a polishing table 410 having a convex spherical-shaped polishing sheet application surface (hereinafter simply referred to as an application surface) 411, and an application surface 411. , A mold plate 420 having a concave spherical sheet forming surface 421, an auxiliary mold plate 430 fitted to the mold plate 420, and a spacer 440 fixed to the auxiliary mold plate 430. In addition, about the structure of the whole lens polishing dish preparation apparatus containing the press mechanism 40, it is the same as that of what is shown in FIG.

  FIG. 14 is a perspective view showing the auxiliary plate 430 and the spacer 440. As shown in FIG. 14, the auxiliary tray 430 includes two auxiliary tray members 431 that form a ring shape when combined. Each auxiliary mold dish member 431 includes an auxiliary curved surface 432 having the same curvature as the sheet molding surface 421 and a fitting part 433 that fits with a fitting part 422 (see FIG. 13) provided on the mold dish 420. The auxiliary curved surface 432 is formed to be a curved surface continuous with the sheet molding surface 421 when the auxiliary mold tray 430 is fitted to the mold plate 420. Further, the opening 434 formed by combining the two auxiliary mold dish members 431 has the same or slightly larger diameter as the mold dish 420.

On the auxiliary curved surface 432, a spacer 440 that forms a ring shape when combined is fixed by an adhesive or welding. The upper surface 441 of the spacer 440 has a concave spherical shape corresponding to the pasting surface 411 (that is, having the same curvature as the pasting surface 411). The height of the spacer 440 (distance between the upper surface 441 and the auxiliary curved surface 432) has a thickness (target value) after compression of the abrasive sheet 50 to be attached to the application surface 411 has a _{T k.} The position of the spacer 440 is determined so that the axis passing through the center of curvature Q of the pasting surface 411 and the sheet forming surface 421 passes through the center O of the spacer 440 in a state where the auxiliary curved surface 432 is combined.

When manufacturing the lens polishing dish, the two auxiliary mold dish members 431 are fitted from the outer peripheral side of the mold dish 420. Then, the polishing sheet 50 is disposed on the sheet molding surface 421 from the opening 434. Furthermore, the polishing table 410 with the adhesive applied to the application surface 411 is pressed against the polishing sheet 50 and pressed until the application surface 411 contacts the upper surface 441 of the spacer 440. Thereby, the abrasive sheet 50 is compressed to a thickness of T _k are attached to the polishing table dish 410, the corresponding spherical shape sheet forming surface 421 is transferred to the abrasive sheet 50.

  According to such a modified example 2-3, it is not necessary to align the spacer 440 with respect to the affixing surface 411 and the sheet molding surface 421, and the manufacturing process of the lens polishing dish can be simplified. Further, by preparing a plurality of auxiliary mold plates 430 in which the positions of the spacers 440 with respect to the auxiliary curved surface 432 are prepared, it is possible to easily cope with changing the diameter of the polishing table plate 410.

  In the above modified example 2-3, the auxiliary plate is formed by two auxiliary plate members, but the auxiliary plate may be formed by three or more members. Further, the spacer need not be provided on the entire circumference of the auxiliary curved surface, and the spacer may be partially provided as long as the distance between the sticking surface 411 and the sheet molding surface 421 can be kept constant. Specifically, at least three members having the same height are arranged on the periphery of the auxiliary curved surface centered on a point on the axis passing through the center of curvature Q of the pasting surface 411 and the sheet forming surface 421 and used as a spacer. May be.

(Embodiment 3)
Next, a third embodiment of the present invention will be described. FIG. 15 is a cross-sectional view showing a part of the lens polishing dish preparation apparatus according to the third embodiment.
As shown in FIG. 15, the lens polishing dish preparation device according to the third embodiment includes a polishing table dish 510 having a convex spherical polishing sheet application surface (hereinafter simply referred to as an application surface) 511, and an application surface 511. comprising a mold dish 520 having a sheet shaping surface 521 of the corresponding concave spherical surface shape and a spacer 530 as the interval maintaining means for maintaining the spacing between the attachment surface 511 and the sheet forming surface 521 to a constant value T _k. In addition, about the structure of the whole lens polishing dish preparation apparatus containing the press mechanism 40, it is the same as that of what is shown in FIG.

  FIG. 16 is a partially sectional perspective view showing the spacer 530 in an enlarged manner. As shown in FIG. 16, the spacer 530 has a ring shape in which an opening 531 is provided at the center. The diameter of the opening 531 is equal to or larger than the diameter when the polishing sheet 50 is curved along the sheet forming surface 521, and preferably equal to or larger than the diameter when the polishing sheet 50 is planar.

  The inner circumferential surface (wall surface of the opening) 532 of the spacer 530 has a concave spherical shape corresponding to the pasting surface 511 (that is, having the same curvature as the pasting surface 511). It abuts on the peripheral edge 512 of the sticking surface 511. On the other hand, the lower surface (lower surface) 533 of the spacer 530 is a flat surface, and this lower surface 533 is in contact with the flat portion (the platen plate-side spacer contact surface) 522 around the sheet forming surface 521. Touch.

When manufacturing the lens polishing dish, first, the spacer 530 is disposed on the mold dish 520 so that the axis passing through the center of curvature Q of the bonding surface 511 and the sheet molding surface 521 passes through the center O of the opening 531. . Then, the polishing sheet 50 is disposed on the sheet molding surface 521 from the opening 531. Furthermore, the polishing table 510 with the adhesive applied to the application surface 511 is pressed against the polishing sheet 50 and pressed until the application surface 511 contacts the inner peripheral surface 532 of the spacer 530. As a result, the polishing sheet 50 is affixed to the polishing table 510 and compressed to the thickness T _k , and the spherical shape corresponding to the sheet forming surface 521 is transferred to the polishing sheet 50.

  As described above, according to the third embodiment, since the spacer 530 is provided to maintain a constant distance between the pasting surface 511 and the sheet forming surface 521, an excess of the polishing sheet 50 due to its own weight. Compression can be prevented. Thereby, the polishing sheet 50 can be uniformly compressed to a desired thickness, and the spherical shape of the sheet molding surface 521 can be accurately transferred to the polishing sheet 50. Therefore, even when producing a plurality of lens polishing dishes, it is possible to suppress variations in the thickness and surface shape of the polishing sheet 50.

  According to the third embodiment, the affixing surface 511 is brought into contact with the inner peripheral surface 532 of the spacer 530 having a spherical shape. Therefore, even if the center axis of the spacer 530 is slightly shifted in the horizontal direction from the center axis of the mold plate 520, the center axis of the polishing table plate 510 is pushed down vertically according to the center axis of the mold plate 520. After the upper end of the peripheral surface 532 comes into contact with the application surface 511, the spacer 530 slides along the flat portion 522 of the mold plate 520, so that the inner peripheral surface 532 contacts the application surface 511 in the horizontal direction. The position is corrected. Therefore, according to the third embodiment, there is an advantage that exact positioning of the spacer 530 is not necessary.

  Further, according to the third embodiment, since the entire polishing sheet 50 is compressed between the sticking surface 511 and the sheet forming surface 521, the polishing sheet 50 is uniformly compressed to the end of the polishing sheet 50 and the end of the polishing sheet 50 is compressed. Can be brought into close contact with the pasting surface 511. Accordingly, it is possible to suppress peeling from the pasting surface 511 at the end of the polishing sheet 50.

  Further, according to the third embodiment, it is possible to affix the polishing sheet 50 over a wider range of the affixing surface 511 than in the case of the second embodiment.

  Also in the third embodiment, similarly to the first embodiment, a stopper portion that restricts the displacement of the spacer 530 in the horizontal direction may be provided on the lower surface 533 of the spacer 530.

(Modification 3)
Next, Modification 3 of Embodiment 3 will be described. FIG. 17 is a cross-sectional view showing a part of a lens polishing dish manufacturing apparatus according to Modification 3.
As shown in FIG. 17, the lens polishing dish preparation device according to Embodiment 3 includes a polishing table dish 610 having a concave spherical-shaped polishing sheet application surface (hereinafter simply referred to as an application surface) 611, and an application surface 611. comprising a mold dish 620 having a sheet shaping surface 621 of the spherical shape of the corresponding convex and a spacer 630 as the interval maintaining means for maintaining the spacing between the attachment surface 611 and the sheet forming surface 621 to a constant value T _k. The mold tray 620 is screwed into the mold tray receiver 44 at a screw portion 623 provided on the leg portion 622.

  FIG. 18 is a partially sectional perspective view showing the spacer 630 in an enlarged manner. As shown in FIG. 18, the spacer 630 has a ring shape in which a cylindrical opening 631 is provided at the center. The outer circumferential surface 632 of the spacer 630 has a convex spherical shape corresponding to the pasting surface 611 (that is, having the same curvature as the pasting surface 611), and the outer circumferential surface 632 is formed on the peripheral portion 612 of the pasting surface 611. Abut. On the other hand, the lower surface 633 of the spacer 630 has a flat shape, and the lower surface 633 contacts the upper surface 44 a of the mold tray receiver 44. That is, in the case of the modification 3, the upper surface 44a is a mold plate side spacer contact surface.

When producing a lens polishing dish, first, the spacer 630 is disposed on the mold dish holder 44 so that the axis passing through the center of curvature Q of the bonding surface 611 and the sheet molding surface 621 passes through the center O of the opening 631. To do. Then, the polishing sheet 50 is disposed on the sheet molding surface 621 from the opening 631. Further, the polishing table 610 with the adhesive applied to the application surface 611 is pressed against the polishing sheet 50 and pressed until the application surface 611 contacts the outer peripheral surface 632 of the spacer 630. As a result, the polishing sheet 50 is affixed to the polishing table 610 and compressed to the thickness T _k , and the spherical shape corresponding to the sheet forming surface 621 is transferred to the polishing sheet 50.

As described above, according to the modified example 3, when a lens polishing dish having a concave spherical shape is produced, the curved surface of the sticking surface and the contact surface that contacts the flat surface around the sheet forming surface are provided. A spacer can be provided.
In the third modified example, a stopper portion that restricts the positional displacement of the spacer 630 in the horizontal direction may be provided on the lower surface 633 of the spacer 630.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described. FIG. 19 is a cross-sectional view showing a part of the lens polishing dish preparation apparatus according to the fourth embodiment.
As shown in FIG. 19, the lens polishing dish preparation device according to Embodiment 4 includes a polishing table dish 710 having a convex spherical-shaped polishing sheet application surface (hereinafter simply referred to as an application surface) 711, and an application surface 711. comprising a mold dish 720 having a sheet shaping surface 721 of the corresponding concave spherical surface shape and a spacer 730 as the interval maintaining means for maintaining the spacing between the attachment surface 711 and the sheet forming surface 721 to a constant value T _k. In addition, about the structure of the whole lens polishing dish preparation apparatus containing the press mechanism 40, it is the same as that of what is shown in FIG.

  The polishing plate 710 is provided with a shaft portion 712, and a disc-shaped spacer receiving portion 713 is provided on the side surface of the shaft portion 712 so as to protrude from the outer edge of the pasting surface 711. . Of the surface of the spacer receiving portion 713 on the polishing table tray 710 side, a portion on the outer peripheral side of the pasting surface 711 is a platen side spacer contact surface 714 that contacts the spacer 730.

  FIG. 20 is a partially sectional perspective view showing the spacer 730 in an enlarged manner. As shown in FIG. 20, the spacer 730 has a ring shape in which a cylindrical opening 731 is provided at the center. The diameter of the opening 731 is not less than the diameter when the polishing sheet 50 is curved along the sheet forming surface 721, and preferably not less than the diameter when the polishing sheet 50 is planar.

  The upper surface 732 of the spacer 730 is a flat surface, and the upper surface 732 comes into contact with the platen-side spacer contact surface 714. On the other hand, the outer peripheral surface 733 of the spacer 730 has a convex spherical shape corresponding to the sheet forming surface 721 (that is, has the same curvature as the sheet forming surface 721), and this outer peripheral surface 733 is the sheet forming surface 721. It contacts with the peripheral edge 722.

When manufacturing the lens polishing dish, first, the spacer 730 is arranged on the sheet molding surface 721 so that the axis passing through the center of curvature 7 of the opening 731 passes through the sticking surface 711 and the center of curvature Q of the sheet molding surface 721. To do. Then, the polishing sheet 50 is disposed on the sheet molding surface 721 from the opening 731. Further, the polishing plate 710 with the adhesive applied to the affixing surface 711 is pressed against the polishing sheet 50 and is pressed until the platen side spacer contact surface 714 abuts the upper surface 732 of the affixing surface 711. As a result, the polishing sheet 50 is affixed to the polishing table 710 and compressed to the thickness T _k , and the spherical shape corresponding to the sheet forming surface 721 is transferred to the polishing sheet 50.

  As described above, according to the fourth embodiment, since the spacer 730 is provided to maintain a constant distance between the pasting surface 711 and the sheet forming surface 721, the polishing plate 50 is excessively increased with respect to the polishing sheet 50 due to its own weight. Compression can be prevented. Accordingly, the polishing sheet 50 can be uniformly compressed to a desired thickness, and the spherical shape of the sheet forming surface 721 can be accurately transferred to the polishing sheet 50. Therefore, even when producing a plurality of lens polishing dishes, it is possible to suppress variations in the thickness and surface shape of the polishing sheet 50.

  In the fourth embodiment, the outer peripheral surface 733 of the spacer 730 having a spherical shape is brought into contact with the sheet forming surface 721. Therefore, even if the center axis of the spacer 730 is slightly inclined with respect to the center axis of the mold plate 720, the center plate of the polishing table pan 710 is pushed down vertically according to the center axis of the mold plate 720, thereby After the upper surface 732 of the spacer 730 contacts the side spacer contact surface 714, the outer peripheral surface 733 slides along the spherical shape of the sheet forming surface 721, and the upper surface 732 contacts the platen side spacer contact surface 714. Thus, the inclination of the spacer 730 is corrected. Therefore, according to the third embodiment, there is an advantage that exact positioning of the spacer 730 is not necessary.

  Further, according to the fourth embodiment, since the entire polishing sheet 50 is compressed between the pasting surface 711 and the sheet forming surface 721, it is uniformly compressed to the end of the polishing sheet 50 and the end of the polishing sheet 50 is also compressed. Can be brought into close contact with the pasting surface 711. Therefore, it is possible to suppress peeling from the pasting surface 711 at the end of the polishing sheet 50.

  Further, according to the fourth embodiment, it is possible to affix the polishing sheet 50 over a wide range of the affixing surface 711 as compared with the case of the second embodiment.

  Also in the fourth embodiment, similarly to the first embodiment, a stopper portion extending from the outer peripheral side of the spacer 730 to the side surface of the mold plate 720 is provided to restrict the positional displacement of the spacer 730 in the horizontal direction. You may do it.

(Modification 4)
Next, a fourth modification of the fourth embodiment will be described. FIG. 21 is a cross-sectional view showing a part of a lens polishing dish manufacturing apparatus according to Modification 4.
As shown in FIG. 21, the lens polishing dish preparation device according to the fourth embodiment includes a polishing table dish 810 having a concave spherical-shaped polishing sheet application surface (hereinafter simply referred to as an application surface) 811, and an application surface 811. comprising a mold dish 820 having a sheet shaping surface 821 of the spherical shape of the corresponding convex and a spacer 830 as the interval maintaining means for maintaining the spacing between the attachment surface 811 and the sheet forming surface 821 to a constant value T _k. The mold tray 820 is screwed into the mold tray receiver 44 at a screw portion 823 provided on the leg portion 822.

  FIG. 22 is a partially sectional perspective view showing the spacer 830 in an enlarged manner. As shown in FIG. 22, the spacer 830 has a ring shape in which an opening 831 is provided in the center. The upper surface 832 of the spacer 830 is a flat surface, and the upper surface 832 abuts on a flat portion (a platen-side spacer contact surface) 812 around the pasting surface 811. On the other hand, the inner peripheral surface 833 of the spacer 830 has a concave spherical shape corresponding to the sheet molding surface 821 (that is, has the same curvature as the sheet molding surface 821), and the inner peripheral surface 833 is a sheet molding. It contacts the peripheral edge 824 of the surface 821.

When manufacturing a lens polishing dish, first, the spacer 830 is disposed on the sheet molding surface 821 so that the axis passing through the center of curvature 8 of the opening 831 passes through the sticking surface 811 and the center of curvature Q of the sheet molding surface 821. To do. Then, the polishing sheet 50 is disposed on the sheet molding surface 821 from the opening 831. Further, the polishing table pan 810 with the adhesive applied to the affixing surface 811 is pressed against the polishing sheet 50 and pressed until the flat portion 812 of the polishing table pan 810 contacts the upper surface 832 of the spacer 830. As a result, the polishing sheet 50 is affixed to the polishing table 810 and compressed to the thickness T _k , and a lens polishing dish formed in a spherical shape corresponding to the sheet molding surface 821 is produced.

As described above, according to the fourth modification, the contact surface that contacts the curved surface of the pasting surface 811 and the flat surface around the sheet forming surface 821 when manufacturing a lens polishing dish having a concave spherical shape. A spacer can be provided.
Note that, also in the fourth modification, a stopper portion that restricts the displacement of the spacer 830 in the horizontal direction may be provided on the lower surface 273 of the spacer 830.

(Embodiment 5)
Next, a fifth embodiment of the present invention will be described. FIG. 23 is a partial cross-sectional view showing the lens polishing dish manufacturing apparatus according to the fifth embodiment.
As shown in FIG. 23, the lens polishing dish preparation device 5 according to the fifth embodiment is a cap-shaped cylinder 60 that covers the shaft portion 12 of the polishing dish base 10 with respect to the lens polishing dish preparation device 1 shown in FIG. 1. Is further provided.

The upper surface of the cylindrical body 60 is closed by a ceiling wall 61. On the upper surface of the ceiling wall 61, a recess 62 for receiving the hard sphere 47 is formed.
On the other hand, a pressing portion 63 extending to the outer peripheral side is provided at the lower end portion of the cylindrical body 60. The lower surface of the pressing portion 63 is in contact with the upper surface of the spacer receiving portion 13 and applies the pressing force received from the hard sphere 47 to the polishing table 11.

  By providing such a cap-shaped cylinder 60, the polishing table 11 can be uniformly pressed in a direction parallel to the central axis of the mold plate 20. Therefore, even if it is not an expert, it is possible to easily produce a lens polishing dish in which the polishing sheet 50 is compressed to a uniform thickness and the spherical shape of the sheet molding surface 23a is accurately transferred to the polishing sheet 50. Become. In addition, when producing a plurality of lens polishing dishes, variations in the thickness and surface shape of the polishing sheet 50 can be suppressed.

  In addition, the cap-shaped cylinder 60 with which the lens polishing dish preparation apparatus which concerns on Embodiment 5 is provided is Embodiment 2-4 and modifications 1-1 to 1-2, 2-1 to 2-3, And 4 may be applied. When the spacer receiving part is not provided on the polishing table (for example, the polishing table 210 shown in FIG. 10), the lower surface of the pressing unit 63 may be brought into contact with the upper surface of the polishing table.

  In Embodiment 1-5 demonstrated above, although the spacer was used as a space | interval maintenance means which maintains the space | interval of a polishing sheet sticking surface and a sheet formation surface uniformly, if both space | intervals can be maintained constant, Any configuration may be used. For example, instead of arranging the spacer 30 shown in FIG. 1, a support member having the same height as the upper surface 32a of the spacer 30 and extending from the connecting member 43 to the inner peripheral side of the spacer receiving portion 13 is connected. It is good also as a structure which fixes to the member 43 and makes the spacer receiving part 13 contact | abut on this support member.

  In the first to fifth embodiments described above, the adhesive is applied to the polishing sheet application surface and the polishing sheet is applied. However, the adhesive is applied to the surface of the polishing sheet on the side facing the polishing sheet application surface. Alternatively, an adhesive may be applied to both the polishing sheet sticking surface and the surface of the polishing sheet facing this.

  In Embodiments 1 to 5, the spacer and the mold tray are separate members, but the spacer may be provided integrally with the mold plate.

  Moreover, in Embodiment 1-5, although it was set as the structure which arrange | positions a mold plate below and presses the grinding | polishing sheet arrange | positioned on the sheet | seat molding surface from the upper direction with a grinding | polishing stand plate, It is good also as a structure which reverses a positional relationship (up-and-down relationship), arrange | positions a grinding | polishing base plate below, and presses the grinding | polishing sheet arrange | positioned on the grinding | polishing sheet sticking surface with a type | mold plate.

1, 5 Lens polishing dish preparation device 2 Lens polishing dish 10 Polishing dish substrate 11, 110, 210, 410, 510, 610, 710, 810 Polishing table 11a, 111, 211, 411, 511, 611, 711, 811 Surface 112, 812 Plane part
12,712 Shaft part 12a receiving part 13,713 spacer receiving part 13a, 714 counter plate side spacer contact surface 20,120,220,420,520,620,720,820 type plate 21 plate part 21a type plate side Spacer contact surface 22, 122, 622, 822 Leg 23 Recess 23a, 121, 221, 421, 521, 621, 721, 821 Sheet forming surface 24, 123, 623, 823 Screw part 25 Plane part 30, 130, 230, 330, 440, 530, 630, 730, 830 Spacer 31, 131, 231, 531, 631, 731, 831 Opening 32, 132 Ring part 32a, 134, 232, 441, 732, 832 Upper surface 32b, 135, 233, 533, 633 Lower surface 33, 133 Stopper 33a, 136, 532, 833 Inner peripheral surface 40 Press 41, 42 Support member 43 Connecting member 44 Mold tray holder 44a Upper surface 45 Screw ring 46a Recess 46 Press rod 47 Hard ball 48 Operation part 50 Polishing sheet 51 Peripheral part 52 Notch 55 Adhesive 60 Tubular body 61 Ceiling wall 62 Recess 63 Press part 212 , 222, 512, 612, 722, 824 Peripheral part 422 Fitting part 430 Auxiliary dish 431 Auxiliary dish member 432 Auxiliary curved face 433 Fitting part 434 Opening 632, 733 Peripheral surface

Claims (7)

In a lens polishing dish preparation device for preparing a lens polishing dish used for polishing spherical lenses,
A mold plate provided with a polished surface molding surface having a spherical shape corresponding to the final finished surface of the spherical lens;
An abrasive sheet affixing surface to which an abrasive sheet is affixed, a polishing table provided with an abrasive sheet affixing surface having a spherical shape corresponding to the polished surface molding surface;
A pressing mechanism for pressing the polishing table plate toward the polishing surface molding surface;
A spacing maintaining means for maintaining a constant spacing between the polishing surface molding surface and the polishing sheet attaching surface;
A lens polishing dish preparation apparatus comprising: The interval maintaining means is a spacer disposed between a polishing dish base provided at a tip of the polishing table and the mold dish or a mold dish support that supports the mold dish,
2. The lens polishing dish manufacturing apparatus according to claim 1, wherein the spacer is disposed on an outer peripheral side of the polishing surface molding surface and the polishing sheet attaching surface.   2. The lens polishing dish manufacturing apparatus according to claim 1, wherein the gap maintaining unit is a spacer that contacts the polishing sheet attaching surface and the polishing surface molding surface. The interval maintaining means is a spacer disposed between a polishing dish base provided at a tip of the polishing table and the mold dish or a mold dish support that supports the mold dish,
On the outer peripheral side of the polishing surface molding surface, a mold plate side spacer contact surface that contacts the spacer is provided,
The lens polishing plate manufacturing apparatus according to claim 1, wherein the spacer is in contact with the polishing sheet sticking surface and the mold plate side spacer contact surface. The interval maintaining means is a spacer disposed between a polishing dish base provided at a tip of the polishing table and the mold dish or a mold dish support that supports the mold dish,
On the outer peripheral side of the polishing sheet pasting surface, a platen side spacer contact surface that contacts the spacer is provided,
The lens polisher preparation device according to claim 1, wherein the spacer comes into contact with the polishing surface molding surface and the platen side spacer contact surface.   The said spacer is arrange | positioned centering | focusing on the point on the axis | shaft which passes along the spherical center of the said grinding | polishing surface shaping | molding surface, and the spherical center of the said polishing sheet sticking surface. The lens polishing dish preparation apparatus of description. A lens polishing dish used for polishing spherical lenses, in which a lens polishing dish is prepared by attaching a polishing sheet to a polishing table,
On the mold plate provided with a polishing surface molding surface having a spherical shape corresponding to the final finish surface of the spherical lens, the distance between the polishing sheet application surface of the polishing table and the polishing surface molding surface is kept constant. A spacer arrangement step of arranging the interval maintaining means;
A polishing sheet arrangement step of arranging the polishing sheet on the polishing surface molding surface;
Applying an adhesive to at least one of the polishing sheet sticking surface and the surface of the polishing sheet facing the polishing sheet sticking surface, and directing the polishing platen to the polishing surface molding surface by a pressing mechanism, A pressing step of pressing until the spacer contact surface on the polishing platen side contacts the spacer;
An adhesive curing step of curing the adhesive in a state where the abrasive sheet is compressed by the abrasive sheet pasting surface and the abrasive surface molding surface;
A method for producing a lens polishing dish, comprising:

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