JP4952614B2 - Glass lens molding equipment - Google Patents

Description

  The present invention relates to a glass lens molding apparatus and a glass lens molding method using a glass mold method.

  In recent years, various video cameras have become widespread, and there has been a demand for reduction in size and weight and cost. With the downsizing of the entire apparatus, there is also a demand for downsizing of optical elements such as lenses.

  In lens processing, there is a grinding and polishing method that is manufactured by grinding and polishing a glass material. From the viewpoint of workability and mass productivity, a so-called glass mold method is used.

  This glass molding method is a method in which a glass material is heated and softened, the softened glass material is put into a mold, and press-molded into a desired shape. As a mold used for the glass mold method, two sets of press molds (cores) are inserted along the inner peripheral surface of a cylindrical body mold (sleeve) and the axes of the respective press molds are aligned. is there. Further, as shown in FIGS. 10A and 10B, two sets of body molds (mold dies) 101 and 102 into which press dies 103 and 104 are inserted are prepared. Some of them perform positioning by engaging a positioning pin (round pin 105) provided in 102 and a positioning hole (round hole 106).

  An optical element manufactured by the glass mold method needs to have a precise positional relationship between optical surfaces formed by the respective molds.

  In recent years, the demand for a concave meniscus lens has increased along with the miniaturization and high precision of the lens unit. However, it is very difficult to shape this concave meniscus lens by the glass molding method described above. This is because, generally, the thermal expansion coefficient of the mold for molding is smaller than that of the glass material, so if the mold has a convex shape, the glass material may adhere to the mold or be pressed against the mold. This is because cracks occur in the molded product due to the stress generated by the contact.

  Therefore, a method has been proposed in which a temperature difference is formed between the upper and lower molds, and the stress caused by the glass material being pressed against the mold by thermal shrinkage is reduced by bending the entire lens by the thermal shrinkage difference. Yes.

  However, when a temperature difference is made between the upper and lower molds, the thermal expansion also changes depending on the temperature difference between the upper and lower molds in the positioning method by being along the inner peripheral surface of the pair of press molds (upper and lower molds). And a difference in clearance between the upper and lower molds. This positioning method also has a problem that it is difficult to make a temperature difference between the upper and lower molds due to the heat conduction of the trunk mold.

  When a structure in which the upper and lower body molds are divided is used, the temperature difference between the upper and lower molds is easily attached. However, as shown in FIG. 10C, a round pin 105 is formed in one body mold 101, a round hole 106 is formed in the other body mold 102, and the round pin 105 and the round hole 106 are engaged. When positioning is performed, the space between the round pin 105 and the round hole 106 changes due to thermal expansion corresponding to the temperature difference between the body molds 101 and 102, and the position accuracy of the upper and lower mold cores cannot be maintained. Furthermore, the engagement between the round pin 105 and the round hole 106 is not performed, the mold is damaged, and the entire apparatus may be broken. Therefore, a large temperature difference could not be provided. That is, only expansion corresponding to the clearance between the round pin 105 and the round hole 106 is allowed.

  Furthermore, when molding a large-diameter lens, the press die (upper and lower die) also has a large diameter, and the pitch interval between the plurality of round pins 105 and round holes 106 provided on the outer periphery of the barrel dies 101 and 102 is increased. Also grows. The greater the pitch interval between the round pins 105 and the round pins 105, the greater the displacement of the distance due to expansion. Therefore, the positional accuracy of the upper and lower mold cores cannot be maintained, and the round pins 105 and the round holes are not maintained. The problem that the engagement of 106 is not performed, the mold is damaged, and the entire apparatus is broken appears.

JP 2001-348232 A

The present invention has been proposed in view of such a conventional situation, and it is possible to mold a glass lens that has been difficult to mold in a conventional shape while maintaining the position accuracy of the core of the mold. An object of the present invention is to provide a molding apparatus that can be used.

In order to achieve the above-described object, a glass lens molding apparatus according to the present invention is a glass lens molding apparatus that molds a glass lens from a heat-softened glass material, and has a first surface shape of the glass lens. A first mold member, a second mold member having the other surface shape of the glass lens and opposed to the first mold member, and a first mold member heating for heating the first mold member Means, a second mold member heating means for heating the second mold member, and the first mold member provided on the first mold member and the second mold member to form an optical axis of the glass lens. Positioning means for matching the center axis of the surface shape of the mold member and the center axis of the surface shape of the second mold member forming the optical axis of the glass lens, and the positioning means includes the center Multiple locations at equal intervals with the same circumference around the axis It is. The positioning means are provided in the first mold member and the second mold member at least at three locations at equal intervals with the same circumference around the central axis, and the first mold member and the second mold member. 2 comprises a round pin provided in one of the two mold members and a long hole provided in the other through which the round pin can be inserted, and the longitudinal direction of the long hole is extended radially from the center axis. The

Further, a glass lens molding apparatus according to the present invention is a glass lens molding apparatus for molding a glass lens from a heat-softened glass material, the first mold member having one surface shape of the glass lens, and the above A second mold member having the other surface shape of the glass lens and facing the first mold member; first mold member heating means for heating the first mold member; and the second mold member. A second mold member heating means for heating the mold member; and a surface shape of the first mold member provided on the first mold member and the second mold member and forming an optical axis of the glass lens. Positioning means for matching the central axis with the central axis of the surface shape of the second mold member that forms the optical axis of the glass lens, and the positioning means has the same circle around the central axis. It is circumferentially provided at a plurality of locations at equal intervals. The positioning means includes a slide core provided in at least three places on the first mold member and the second mold member.

  In the present invention, even when a temperature difference is provided between the pair of mold members, the positioning means maintains the axis center of each mold, that is, the axis center of the optical axis of the glass lens to be molded. The molding can be performed with high accuracy.

  Hereinafter, specific embodiments of an optical glass element molding apparatus to which the present invention is applied will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, an optical glass element molding apparatus 1 according to the present invention includes an upper mold member 13 including an upper mold 11 and an upper mold core 12 that is inserted into the upper mold 11. A lower mold member 16 that is opposed to the upper mold member 13 and includes a lower mold die 14 and a lower mold core 15 that is fitted into the lower mold die 14, an upper mold heating unit 17 that heats the upper mold member 13, And a lower mold heating unit 18 for heating the mold member 16. In addition, the molding apparatus 1 is a positioning unit that maintains the axial center of the optical axis of the glass lens that is a molded product, which includes a through-hole 11 b provided in the upper mold member 13 and an alignment pin 14 b of the lower mold member 16. 26. In the molding apparatus 1, the upper mold member 13 is fixed to the ram 22 through the movable platen 21, and the lower mold member 16 is fixed to the fixed shaft 24 through the fixed platen 23. As shown in FIG. 3, the lower mold member 16 is screwed with screws 25 inserted into through holes provided in the fixed platen 23 and the fixed shaft 24. Similarly, the upper mold member 13 is screwed with screws 25 inserted through through holes provided in the movable platen 21 and the ram 22.

  As shown in FIGS. 1 and 2, the molding apparatus 1 presses the upper mold member 13 against the lower mold member 16, and heat-softened preform 2 set between the upper mold core 12 and the lower mold core 15. To form a molded product. Specifically, in the molding apparatus 1, the ram 22 is connected as a drive source to, for example, a hydraulic cylinder (not shown), and the movable plate 21 coupled to the ram 22 is fixed to the fixed plate 23 by driving the drive source. The upper mold core 12 and the lower mold core 15 are pressed while being positioned by the positioning means 26, and the set heat-softened preform 2 is compressed to form a molded product. The molding apparatus 1 can release the molded product from the upper mold core 12 and the lower mold core 15 by driving the movable platen 21 in a direction away from the fixed platen 23 after molding. In addition, the molding apparatus 1 provides a temperature difference between the upper mold member 13 and the lower mold member 16 during the mold release process of the molded product, so that the final molded product can be accurately and without damage. In terms of form, complex shapes such as meniscus lenses can be completed.

  Further, the molding apparatus 1 includes all of the members including the movable platen 21, the fixed platen 23, the upper mold heating unit 17, and the lower mold heating unit 18 in order to prevent contamination due to oxidation or the like of the glass material during press working. Then, press molding is performed in a state where the inside of the sealed chamber is placed in a sealed chamber (not shown) and the inside of the sealed chamber is in a nitrogen atmosphere.

  As described above, the molding apparatus 1 is not limited to the movable plate 21 being fixed to the upper mold member 13 and the upper mold member 13 is movable, and the same movable plate is attached to the lower mold member 16. The lower mold member 16 may be movable, or only the lower mold member 16 may be movable.

  As shown in FIGS. 1 to 3, the upper mold member 13 of the molding apparatus 1 includes an upper mold 11 and an upper mold core 12 and has a substantially cylindrical shape as a whole.

  The upper die 11 of the upper member 13 is made of a material that is tough, has high rigidity, and is excellent in heat resistance, such as tungsten carbide or silicon carbide. In the upper die 11, a notch groove 11 a having a predetermined depth is formed over the entire inner peripheral surface at the end of the inner peripheral surface facing the movable platen 21.

  Further, the upper die 11 has a depth direction parallel to the central axis A and a plurality of through-holes 11 b radially formed with respect to the central axis A. The through-holes 11b are a plurality of long holes whose depth direction is parallel to the central axis A and are formed radially with respect to the central axis A, and are provided at four equal intervals on the same circumference. An alignment pin 14b provided in a lower die 14 described later is inserted through the through hole 11b. The through-hole 11b is a long hole, and a straight surface 11c extending in the longitudinal direction thereof is formed so as to be parallel to the radial direction with respect to the central axis A.

  Here, the central axis A is the central axis of the upper mold member 13, that is, the central axis of the upper mold core 12, and coincides with the optical axis center of the glass lens to be molded. Are the same. The same applies to the lower mold member 16 to be described later, and unless otherwise limited, the glass lens to be molded has one optical axis. Therefore, the central axis of the upper mold member 13, the central axis of the lower mold member 16, and the glass lens In the case of an optical axis, a glass lens or a mold core, the same central axis A is indicated.

  The upper mold core 12 of the upper mold member 13 is made of the same material as that of the upper mold 11 and has a substantially cylindrical shape. The outer diameter of the upper mold member 12 is substantially equal to the inner circumference of the upper mold 11 and is inserted into the inner circumference. It is. Further, the upper core 12 has a press-molded surface 12a formed on the surface facing the lower mold member 16, and a convex portion 12b is formed around the central axis A corresponding to the core of the mold. The convex part 12b is formed in the curved surface according to the curvature of the lens which is a desired molded article. The upper mold core 12 is formed with a projecting piece 12 c that engages with the notch groove 11 a of the upper mold 11 over the entire periphery of the end on the side facing the movable platen 21.

  As shown in FIGS. 1 to 3, the lower mold member 16 of the molding apparatus 1 includes a lower mold 14 and a lower mold core 15, and has a substantially cylindrical shape as a whole.

  Similar to the upper die 11, the lower die 14 of the lower die member 16 is made of a material that is tough, has high rigidity, and is excellent in heat resistance, such as tungsten carbide and silicon carbide. Further, in the lower die 14, a notch groove 14 a having a predetermined depth is formed over the entire inner peripheral surface at the end of the inner peripheral surface facing the fixed plate 23.

  Further, the lower die 14 is formed with alignment pins 14b for alignment at a plurality of positions radially with respect to the central axis A, the height direction being parallel to the central axis A. The alignment pins 14b are a plurality of round pins that are parallel to the central axis A and formed radially with respect to the central axis, and are positioned on the same circumference at positions facing the through holes 11b of the upper die 11. Four places are provided at intervals. The alignment pin 14 b is inserted through a through hole 11 b provided in the upper die 11. Further, the alignment pin 14b is formed with a tapered portion 14c at its distal end portion that facilitates insertion into the through hole 11b.

  The lower mold core 15 of the lower mold member 16 is made of the same material as the lower mold die 14 and has a substantially cylindrical shape. The outer diameter of the lower mold member 15 is substantially equal to the inner circumference of the lower mold die 14 and is inserted into the inner circumference. It is. Further, the lower mold core 15 has a press-molded surface 15a formed on the surface facing the upper mold member 13, and a recess 15b formed around the central axis corresponding to the core of the mold. The recess 15b is formed in a curved surface corresponding to the curvature of the lens which is a desired molded product. The lower mold core 15 is formed with a projecting piece 15 c that engages with the notch groove 14 a of the lower mold die 14 over the entire periphery of the end on the side facing the fixed platen 23. In the present embodiment, the curvature of the concave portion 15b is smaller than the curvature of the convex portion 12b of the upper mold core 12.

  As shown in FIG. 1, the upper mold heating unit 17 is a heater that surrounds the periphery of the upper mold member 13 and heats the upper mold member 13. As shown in FIGS. 1 and 2, the upper mold heating unit 17 moves following the movement of the upper mold member 13.

  The lower mold heating unit 18 is a heater that surrounds the periphery of the lower mold member 16 and heats the lower mold member 16.

  The upper mold heating unit 17 and the lower mold heating unit 18 can be controlled independently, and a temperature difference can be provided between the upper mold member 13 and the lower mold member 16.

  Here, the engagement between the through hole 11b of the upper mold member 13 and the alignment pin 14b of the lower mold member 16 in the molding apparatus 1, that is, the positioning means 26 of the molding apparatus 1 will be described with reference to FIGS. do.

  As shown in FIG. 5, the positioning means 26 of the molding apparatus 1 has an optical axis of a glass lens that is molded by inserting the alignment pin 14 b of the lower mold member 16 into the through hole 11 b of the upper mold member 13. Maintained. In the molding apparatus 1, as described above, the through-hole 11 b is a long hole formed on the same circumference around the central axis A of the upper mold member 13, that is, the core of the lens that is the molded product. The longitudinal direction of the hole extends in the radial direction from the central axis A, and four holes are provided at equal intervals. Opposing to the through hole 11b, an alignment pin 14b is provided on the same circumference around the central axis A of the lower mold member 16, that is, the core of the lens as a molded product. The through-hole 11b and the alignment pin 14b have a predetermined lens tolerance, that is, a lens allowable accuracy error due to the lens diameter, the pitch of the two alignment pins 14b and 14b, the material of the alignment pin 14b, and the coefficient of thermal expansion. It is formed with a clearance that falls within the range.

  As shown in FIG. 5A, the through-hole 11b and the alignment pin 14b are positioned at the initial position, that is, when the upper mold member 13 and the lower mold member 16 are not heated, respectively, the alignment pin 14b is inserted into the through-hole 11b. It is set to be located at the approximate center. Further, as shown in FIG. 5 (B), the through hole 11b and the alignment pin 14b are provided with an upper mold heating unit 17 and a lower mold heating unit in order to facilitate release of a molded product and a mold, which will be described later. When the temperature difference is generated by the 18 independent heating control, the relative position between the through hole 11b and the alignment pin 14b varies due to the thermal contraction difference or the thermal expansion difference. In the present embodiment, the temperature at which the upper mold member 13 is heated more than the lower mold member 16 is set lower. In the molding apparatus 1, by providing a temperature difference between the upper mold member 13 and the lower mold member 16, a difference in thermal expansion occurs, and the insertion position of the alignment pin 14b into the through hole 11b varies. Both the through-hole 11b and the alignment pin 14b are provided at a plurality of positions on the same circumference around the central axis A at equal intervals. Since it is extended in the radial direction, it is not affected by the difference in thermal expansion. That is, in the molding apparatus 1, each of the upper mold member 13 and the lower mold member 16 thermally expands around the central axis A. It can be kept at the position of, and the mold closing operation is not affected.

  In the present embodiment, the lower mold member 16 is formed with a concave portion 15b having a large curvature radius and an alignment pin 14b, and the upper mold member 13 is formed with a convex portion 12b having a small curvature radius and a through hole 11b. ing. In the molding apparatus 1, the upper mold member 13 is set to a temperature lower than that of the lower mold member 16, so that the upper mold member 13, that is, the preform 2 on the convex portion 12 b side having a small curvature radius, is quickly solidified. 16, that is, the preform 2 on the side of the concave portion 15b having a large radius of curvature is slowly solidified. When the preform 2 is solidified, the volume shrinks, so that it bites into the convex portion 12b side, but by providing a temperature difference, it bites with the solidification on the concave portion 15b side to be solidified later, That is, it is possible to reduce the generation of stress caused by the preform 2 pressing against the convex portion 12b. Therefore, in the molding apparatus 1, it is possible to mold a glass lens that has conventionally been difficult to mold in shape while maintaining the position accuracy of the core of the mold.

  In the molding apparatus 1 having the above-described configuration, the heat-softened preform 2 that is a glass material is disposed in the recess 15b of the lower mold core 15, and the upper mold core 12 and the lower mold core 15 perform heating and pressurizing operations. By doing so, it can be accurately molded into the desired lens shape of the optical element.

  Next, a molding method for molding a glass lens using the molding apparatus 1 will be described with reference to the flowchart of FIG.

  In step S <b> 1, the molding apparatus 1 places the preform 2 heated and softened in the recess 15 b of the lower mold member 16. In addition, regarding the preform 2 to be a glass lens, a preheated and softened material may be disposed, or the lower mold member 16 may be heated and softened by the lower mold heating unit 18.

  Next, in step S2, the molding apparatus 1 controls the upper mold heating unit 17 and the lower mold heating unit 18 to heat the upper mold member 13 and the lower mold member 16 to a predetermined temperature, respectively.

  Next, in step S <b> 3, the molding apparatus 1 drives the upper mold member 13 toward the lower mold member 16 via the ram 22 and the movable platen 21, and heats and presses the upper mold core 12 and the lower mold core 15. Perform mold closing operation. During this mold closing operation, the positioning pin 14b of the positioning means 26 is inserted into the through hole 11b, so that the center of the upper mold member 13 and the lower mold member 16 is maintained at the position of the central axis A. Is done. Since the through hole 11b of the positioning means 26 has a plurality of long holes at equal intervals on the same circumference from the central axis A, the longitudinal direction of the long holes is a radial direction. Even if a temperature difference is provided between the mold member 16 and an expansion difference occurs, the mold closing operation can be performed and the position of the central axis A can be maintained.

  Finally, in step S4, the molding apparatus 1 drives the upper mold member 13 to separate it from the lower mold member 16, and releases the molded glass lens. At this time, the molding apparatus 1 provides a temperature difference between the upper mold member 13 and the lower mold member 16 to provide a difference in solidification rate at the position of the preform after molding, facilitating mold release and releasing the mold. Damage to the molded product during molding can be prevented. That is, in the molding apparatus 1, the upper mold member 13 is set to a temperature lower than that of the lower mold member 16, so that the upper mold member 13, that is, the preform 2 on the convex portion 12 b side having a small radius of curvature is quickly solidified. Utilizing the property that the mold member 16, that is, the preform 2 on the concave portion 15 b side with a large curvature radius solidifies slowly, the glass lens to be molded bites into the convex portion 12 b side, that is, the preform 2 is pushed to the convex portion 12 b. The generation of stress caused by hitting can be reduced. Therefore, in the molding apparatus 1, it is possible to mold a glass lens that has been conventionally difficult to mold in shape while maintaining the position accuracy of the core of the mold.

  As described above, the molding apparatus 1 can mold the glass lens while providing a temperature difference between the upper mold member 13 and the lower mold member 16 and maintaining the position of the central axis.

  Subsequently, another embodiment of the positioning means 26 will be described.

  The positioning means 30 shown as the second embodiment includes an alignment pin 31 and a through hole 32 as shown in FIG. The positioning means 30 have the same shape as the positioning pins 14b and the through holes 11b of the positioning means 26, but are provided at three equal intervals on the same circumference around the central axis. Further, the through hole 32 of the positioning means 30 is formed in a long hole in which the longitudinal direction of the long hole extends in the radial direction from the central axis A, similarly to the through hole 11b.

  In the molding apparatus provided with the positioning means 30 having such a configuration, a temperature difference is provided between the upper mold member and the lower mold member in the same manner as the positioning means 26, and the upper mold member and the lower mold member are heated. Even if the expansion difference due to the above occurs, the through hole 32 which is a long hole only thermally expands in the radial direction with respect to the central axis and is relatively displaced, so that the center axis deviation between the upper mold member and the lower mold member can be reduced. Generation | occurrence | production can be accurately performed in the state which prevented the generation | occurrence | production, ie, maintained the axial center of the optical axis of the glass lens shape | molded. In addition, by creating a temperature difference between the upper mold member and the lower mold member, the difference in solidification rate at the position of the molding surface of the preform is used to generate stress generated by pressing the preform on the convex side. Can be reduced, and problems such as breakage of the molded product can be prevented.

  Further, as shown in FIG. 8, the positioning means 40 shown as the third embodiment is provided in one mold member and the other mold member, and is inserted into the slide core 41. Angular pin 42. As with the positioning means 26, the positioning means 40 is provided with four slide cores 41 and angular pins 42 at equal intervals on the same circumference around the central axis. Further, the slide core 41 is provided with a slidable area in the radial direction from the central axis. Further, the angular pin 42 and the slide core 41 are appropriately provided with a clearance according to the tolerance of the glass lens to be molded. The positioning means 40 is not limited to providing four slide cores, and at least three locations are provided at equal intervals on the same circumference with respect to the central axis so as not to cause positional displacement. Also good.

As shown in FIG. 9, a positioning means 50 shown as a reference example of the present invention is provided with a diamond pin 51 provided in one mold member and an alignment hole 52 provided in the other mold member through which the diamond pin 51 is inserted. It consists of. As with the positioning means 26, the positioning means 50 is provided with four diamond pins 51 and alignment holes 52 at equal intervals on the same circumference with the central axis as the center. The diamond pin 51 has a substantially square cross-sectional shape and is provided with rounds at four vertices. On the other hand, the alignment hole 52 is a round hole. The diagonal length of the diamond pin 51 and the diameter of the alignment hole 52 are substantially matched with a predetermined tolerance. Thus, when the diamond pin 51 is inserted into the alignment hole 52, the four vertices of the diamond pin 51 are in contact with the inner peripheral surface of the alignment hole 52. Here, since the contact between the diamond pin 51 and the alignment hole 52 is only the four vertices with rounded corners, it can be inserted even with tight tolerances and can be positioned with high accuracy.

In the molding apparatus including the positioning means 30 and 40 having such a configuration, similarly to the positioning means 26, a temperature difference is provided between the upper mold member and the lower mold member. Even if there is a difference in expansion due to heat, the central axis of the upper mold member and the lower mold member is merely obtained by the thermal expansion of the through-hole 32 which is a long hole in the radial direction relative to the central axis and relative displacement. Generation of deviation can be prevented, that is, molding can be performed with high accuracy while maintaining the axis center of the optical axis of the glass lens to be molded. In addition, by creating a temperature difference between the upper mold member and the lower mold member, the difference in solidification rate at the position of the molding surface of the preform is used to generate stress generated by pressing the preform on the convex side. Can be reduced, and problems such as breakage of the molded product can be prevented.

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

It is the longitudinal cross-sectional view which showed the shaping | molding apparatus to which this invention is applied. It is the longitudinal cross-sectional view which showed the mold closing operation position of the shaping | molding apparatus to which this invention is applied. It is a principal part perspective view of an upper mold member and a lower mold member. (A) is a top view of a lower mold | type member, (B) is a top view of an upper mold | type member. It is the schematic which shows the alignment of the upper mold member of the shaping | molding apparatus to which this invention is applied, and a lower mold member, (A) is the schematic which shows a mode that the alignment pin was penetrated to the through-hole in a non-heating state. Yes, (B) is a schematic view showing a state in which the alignment pin is inserted into the through hole in the heated state. It is a flowchart for demonstrating a shaping | molding method. It is a longitudinal cross-sectional view which shows 2nd Embodiment of a positioning means. It is a longitudinal cross-sectional view which shows 3rd Embodiment of a positioning means. It is a longitudinal cross-sectional view which shows the reference example of a positioning means. It is a figure for demonstrating positioning of the conventional shaping | molding apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Molding apparatus, 2 preform, 11 Upper die, 11a, 14a Notch groove, 11b, 32 Through-hole, 12 Upper mold core, 12a Press molding surface, 12b Convex part, 12c Projection piece, 13 Upper mold member, 14 Lower die, 14b, 31 Alignment pin, 14c Tapered portion, 15 Lower die core, 15a Press molding surface, 15b Recessed portion, 15c Projection piece, 16 Lower die member, 17 Upper die heating portion, 18 Lower die heating portion, 21 Movable platen, 22 ram, 23 Fixed platen, 24 Fixed shaft, 25 Screw, 26, 30, 40, 50 Positioning means, 41 Slide core, 42 Angular pin, 51 Diamond pin, 52 Alignment hole, 101, 102 Body type, 103 press dies, 105 round pins, 106 round holes

Claims (2)

In a glass lens molding apparatus for molding a glass lens from a heat-softened glass material,
A first mold member having one surface shape of the glass lens;
A second mold member having the other surface shape of the glass lens and facing the first mold member;
First mold member heating means for heating the first mold member;
Second mold member heating means for heating the second mold member;
The first mold member and the second mold member, which are provided on the first mold member and the second mold member, form the optical axis of the glass lens and form the optical axis of the glass lens. Positioning means for matching the center axis of the surface shape of the two mold members ,
The positioning means are provided in the first mold member and the second mold member at least at three locations at equal intervals with the same circumference around the central axis, and the first mold member and the second mold member. 2 comprises a round pin provided in one of the two mold members and a long hole provided in the other through which the round pin can be inserted, and the longitudinal direction of the long hole is extended radially from the center axis. molding apparatus for a glass lens that. In a glass lens molding apparatus for molding a glass lens from a heat-softened glass material,
A first mold member having one surface shape of the glass lens;
A second mold member having the other surface shape of the glass lens and facing the first mold member;
First mold member heating means for heating the first mold member;
Second mold member heating means for heating the second mold member;
The first mold member and the second mold member, which are provided on the first mold member and the second mold member, form the optical axis of the glass lens and form the optical axis of the glass lens. Positioning means for matching the center axis of the surface shape of the two mold members ,
The positioning means is an apparatus for molding a glass lens comprising a slide core provided at least at three locations on the first mold member and the second mold member .

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