JP3002531U - Compound aspherical lens molding machine - Google Patents

Abstract

(57) [Abstract] [Purpose] The work of aligning the center of the upper mold and the lower mold with the optical axis of the base spherical lens supported by the lower mold can be performed easily and surely, and the workability is improved. To provide a composite aspherical lens molding die apparatus capable of performing the above, and to provide a composite aspherical lens molding die apparatus capable of efficiently manufacturing a large aspherical lens. [Structure] Lower mold supporting one surface of the base spherical lens; Aspherical mold for molding an aspherical lens portion on the other surface of the base spherical lens; Rotating the aspherical mold around the optical axis of the base spherical lens An upper mold supporting the other surface of the base spherical lens through an operable rotatable mold, and an upper mold side coupling member supported by the upper mold and a lower mold supported by the lower mold. A side coupling member, and when the upper mold side and the lower mold side coupling members are aligned with each other, the centers of the upper mold and the lower mold are aligned with the optical axis of the base spherical lens supported by the lower mold. Compound aspherical lens mold tool with self-aligning coupling.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a molding device for a compound aspherical lens formed by laminating a resin layer on a spherical lens serving as a base.

[0002]

[Prior art and its problems]

 Conventionally, a molding die for molding a compound aspherical lens has a lower die that supports a spherical lens that serves as a base, and an upper die that supports an aspherical die that should face the base spherical lens. Then, after the unhardened resin was applied to the concave portion of the base spherical lens supported by the lower mold, the aspherical convex portion was made to face the concave portion of the base spherical lens, and Match the upper mold. At this time, the positioning projection of the aspherical mold abuts against the abutting portion formed on the peripheral portion of the base spherical lens to form a space between the concave portion and the convex portion, and the resin liquid before curing is It is extended in space on the surface of the base spherical lens. After that, when the resin liquid is cured, a composite aspherical lens in which the aspherical lens portion is attached to the concave portion of the base spherical lens is obtained.

However, according to such a conventional molding die, it takes a lot of work to align the centers of the upper die and the lower die with the optical axis of the base spherical lens supported by the lower die, and the workability is reduced. Bad. Further, since the resin liquid in the space between the concave portion and the convex portion is only spread on the base spherical lens by the approaching movement of the convex portion with respect to the concave portion, especially when manufacturing a large aspherical lens, It will not spread properly in the space.

[0004]

[The purpose of the device]

 The present invention has been made based on the above problems, and it is possible to easily and surely perform the work of aligning the centers of the upper mold and the lower mold with the optical axis of the base spherical lens supported by the lower mold. It is an object of the present invention to provide a compound aspherical lens molding die device that can be improved and can improve workability. It is another object of the present invention to provide a compound aspherical lens molding die device capable of efficiently manufacturing a large aspherical lens.

[0005]

[Outline of the device]

 The present invention for achieving the above object includes: a lower mold for supporting one surface of a base spherical lens; an aspherical surface mold for molding an aspherical lens portion on the other surface of the base spherical lens; An upper mold that faces and supports the other surface of the base spherical lens through a rotatable mold that can be rotated about the optical axis of the base spherical lens; and an upper mold side supported by the upper mold. It has a coupling member and a lower mold side coupling member supported by the lower mold, and when the upper mold side and the lower mold side coupling members are aligned with each other, the centers of the upper mold and the lower mold are It features self-aligning coupling that matches the optical axis of the base spherical lens supported by the lower mold.

A second self-centering coupling can be interposed between the aspherical type and the rotatable type. The second self-aligning coupling has an aspherical side coupling member fixed to an aspherical type and a rotatable mold side coupling member fixed to a rotatable type. When the spherical mold side and the rotatable mold side coupling members are aligned with each other, the centers of the aspherical mold and the rotatable mold are aligned.

A thermosetting resin or an ultraviolet curable resin is attached to the other surface of the base spherical lens, and the resin is extended in a molding space formed by the other surface and the aspherical mold. When the ultraviolet curable resin is used, it is possible to provide an urging means for causing the base spherical lens to follow the contraction of the ultraviolet curable resin due to curing. Then, the other surface of the base spherical lens is formed in a concave shape, and the aspherical surface of the aspherical surface that faces the other surface of the concave surface is formed in a convex shape. It can be regulated by applying a part of the other surface of the base spherical lens to the above aspherical surface.

[0008]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a sectional view showing a first embodiment of a compound aspherical lens molding die device according to the present invention. This molding die device molds a compound aspherical lens using a thermosetting resin, and is particularly effective when molding a large lens.

In FIG. 1, a compound aspherical lens molding die device (hereinafter referred to as “molding die device”) 11 includes a lower mold B supporting one surface 20 a of a base spherical lens 20 and another surface of the base spherical lens 20. 20c via an aspherical mold 21 for molding the aspherical lens part 7 and a rotatable mold 22 capable of rotating the aspherical mold 21 about the optical axis of the base spherical lens 20. The base spherical lens 20 has an upper mold U that faces and supports the other surface 20c. Furthermore, the mold unit 11 has a first self-aligning coupling 17. The first self-aligning coupling 17 has an upper mold side coupling member 17a fixed to an upper mold U and a lower mold side coupling member 17b fixed to a lower mold B. When the lower mold side coupling members 17a and 17b are aligned with each other, the centers of the upper mold U and the lower mold B can be aligned with the optical axis of the base spherical lens 20 supported by the lower mold B. The molding die apparatus 11 also has a tubular member 12 having a circular hole 12a, an inner peripheral support surface 12b, and a female screw hole 12c penetrating the circular hole 12a in the radial direction.

The lower mold B has a base 13, a lens support member 16 supported by the base 13, and a bottom plate 15. The base 13 has a large diameter portion 13i and a small diameter portion 13a which is concentric with the large diameter portion 13i. On the inner peripheral side of the small diameter portion 13a, there are provided a support cylindrical portion 13j having a diameter substantially the same as that of the base spherical lens 20 and slidably supporting the outer peripheral surface of the spherical lens 20, and an inner peripheral flange 13b having a circular hole 13f. Has been formed. A sliding guide hole 13c, a fitting hole 13h, and a space portion 13g are formed on the inner peripheral side of the large diameter portion 13i. Further, female screw holes 13d and 13k are formed in the large diameter portion 13i.

The lens support member 16 slidably fitted in the slide guide hole 13c is formed in an annular shape having a circular through hole 16a, and is arranged at an equal angular interval in the circumferential direction of the peripheral portion in the upper part of FIG. It has a plurality of lens support protrusions 16b that are projected toward. The lens support member 16 is fitted in the sliding guide hole 13c, and the lens support protrusion 16b is projected upward from the circular hole 13f in a state where the inner peripheral flange 13b restricts upward movement beyond a predetermined amount. ing. The lens support member 16 further has recesses 16c into which the compression springs 18 are inserted, at a plurality of circumferential positions.

The bottom plate 15 fitted in the fitting hole 13h is configured as an annular member having a larger diameter than the lens support member 16 and having a through hole 15a having the same diameter as the through hole 16a. The bottom plate 15 has a recess 15c for inserting the compression spring 18 at a position facing the recess 16c, and has a through hole 15b at the peripheral edge facing the female screw hole 13d. The lens support member 16 is slidably fitted in the slide guide hole 13c of the base 13, and the compression spring 18 is contracted between the recesses 16c and 15c to fit in the fitting hole 13h. 5 is fixed by a fixing bolt 14. In this state, the base 13 is fitted into the circular hole 12a of the tubular member 12, and is fixed to the tubular member 12 by the headless fixing screw 8 screwed into the female screw hole 12c of the tubular member 12. It is fixed so that it will be in the state shown in FIG.

The upper die U has an intermediate die 19 and a rotatable die 22. The intermediate die 19 is formed with an abutting portion 19a protruding downward, a large diameter portion 19b, a fitting hole 19c, a female screw hole 19d formed on the outer peripheral edge, and an inner peripheral side of the female screw hole 19d. And the female 19e. The abutting portions 19a are formed so as to project in the circumferential direction on the inner peripheral side of the intermediate die 19 at equal angular intervals. The outer surfaces of the plurality of abutting portions 19a are precisely formed so that they can be fitted into the through holes 17c of the upper mold side coupling member 17a without a gap. The intermediate die 19 has the large-diameter portion 19b abutted against the upper die-side coupling member 17a, and all the tips of the abutting portions 19a are outside the base spherical lens 20 supported by the base 13. It can be brought into contact with the abutment flange 20b formed on the peripheral edge.

The rotatable die 22 has a small diameter portion 22a that is rotatably fitted in the fitting hole 19c and protrudes inward of the intermediate die 19, and a larger diameter portion and a smaller diameter portion than the small diameter portion 22a. It has a large diameter portion 22b formed concentrically with 22a and abutting against the large diameter portion 19b of the intermediate die 19. The rotatable die 22 is also formed in a cylindrical shape concentric with the large-diameter portion 22b, and has a grip portion 22g projecting upward in FIG. 1 and an inner peripheral flat surface located on the inner circumference of the grip portion 22g. And a portion 22c. The rotatable die 22 further includes a through hole 22d formed in the center of the inner peripheral flat portion 22c, a through hole 22e facing the female screw hole 19e of the intermediate die 19, and a cylinder formed on the inner periphery of the small diameter portion 22a. The container 22f has a shape storage portion 22f. In the rotatable die 22 having such a configuration, the small diameter portion 22a is fitted into the fitting hole 19c, and the large diameter portion 22b is abutted against the large diameter portion 19b, and then fixed into the through hole 22e. The bolt 31 is screwed into the female screw hole 19 e of the intermediate die 19 to be fixed to the intermediate die 19.

The rotatable mold 22 fixed to the intermediate mold 19 supports the aspherical mold 21 via the second self-centering coupling 28. The second self-centering coupling 28 has a rotatable mold side coupling member 28a located on the upper side in FIG. 1 and an aspherical mold side coupling member 28b located on the lower side. Both coupling members 28a and 28b are configured to have the same shape, and through holes 28c and 28d having the same diameter are formed in the respective central portions. Both coupling members 28a, 28b have a large number of engaging projections 3a, 4a and a large number of engaging recesses 3b, 4b, respectively, on the opposite peripheral edges.

That is, as shown in FIG. 5, the rotatable type coupling member 28a has a peripheral edge portion radially extending from the center (the coupling member 28a is coupled with the coupling member 28b). Since they have the same shape, a large number of engaging projections 3a and engaging recesses 3b formed in FIG. 4 are alternately formed. Further, as shown in FIGS. 4 and 5, a plurality of engaging projections 4a radially formed from the center toward the radial direction are engaged with the peripheral portion of the aspherical side coupling member 28b. The mating recesses 4b are formed alternately. Therefore, the second self-aligning coupling 28 is configured such that when the coupling members 28a and 28b are aligned in the vertical direction, the engaging projection 3a and the engaging recess 4b are mutually engaged, and the engaging recess 3b and the engaging projection are respectively. 4a can be engaged with each other, and the centers of the through holes 28c and 28d can be easily and surely aligned with each other. Both coupling members 28a, 28b are separated into a rotatable mold 22 and an aspherical mold 21 by fixing bolts 26a, 26b inserted in bolt holes 28i, 28j formed at equal angular intervals in the respective circumferential directions. Each is fixed.

The aspherical surface type 21 has an aspherical surface 21 a facing the concave surface portion 20 c of the base spherical lens 20, a female screw hole 21 b having an axial center at a position coinciding with the axial center of the aspherical mold 21, and the internal screw hole. It has a fitting protrusion 21c centering on 21b and a step 21d formed in a step shape on the outer periphery of the fitting protrusion 21c. The aspherical mold 21 has an aspherical mold side coupling member 28b fixed to the fitting projection 21c with a through hole 28d fitted therein by a fixing bolt 26b. Further, the aspherical mold 21 is inserted through the intermediate plate 25 through the through hole 22d in a state where the coupling member 28b is aligned with the rotatable mold side coupling member 28a on the rotatable mold 22 side. It is fixed to the rotatable mold 22 side by a fixed bolt 23. As a result, the centers (axes) of the aspherical mold 21 and the rotatable mold 22 are aligned. Reference numeral S ₂ is a space on the inner surface side of both coupling members 28 a and 28 b, and reference numeral 30 is fitted on the outer periphery of the small diameter portion 22 a to prevent the rotatable die 22 from coming off from the intermediate die 19. It is a ring member.

On the other hand, the first self-centering coupling 17 includes an upper mold side coupling member 17 a fixed to the intermediate mold 19 of the upper mold U and a lower mold side coupling member fixed to the base 13 of the lower mold B. And the lower mold side coupling members 17a and 17b are aligned with each other, the center of the upper mold U and the lower mold B are supported by the lower mold B. Can be aligned with the optical axis of. The upper mold side and lower mold side coupling members 17a and 17b are configured to have the same shape, and through holes 17c and 17d having the same diameter are formed in the central portions thereof. Both coupling members 17a 1 and 17b 2 have a large number of engaging convex portions 5a and 6a and a large number of engaging concave portions 5b and 6b, respectively, on the opposite peripheral edge portions.

That is, as shown in FIG. 3, the upper mold coupling member 17a has a radial shape from the center to the peripheral portion (since the coupling member 17a has the same shape as the coupling member 17b). A large number of engaging convex portions 5a and engaging concave portions 5b formed in (see FIG. 2) are alternately formed. Further, as shown in FIGS. 2 and 3, on the peripheral portion of the lower mold side coupling member 17b, there are a large number of engaging projections 6a and engaging recesses 6b radially formed from the center toward the radial direction. Are formed alternately. Therefore, the first self-aligning coupling 17 is engaged with the engaging convex portion 5a, the engaging concave portion 6b, and the engaging concave portion 5b when the coupling members 17a and 17b are aligned in the vertical direction. The fitting convex portion 6a can be engaged, and the centers of the through holes 17c and 17d can be easily and surely aligned with each other. Both coupling members 17a, 17b have bolt holes 17i, 17j formed at equal angular intervals in the circumferential direction.

The base 13 fixed to the tubular member 12 has a lower mold side coupling member 17b having an outer peripheral surface fitted to the inner peripheral support surface 12b and a through hole 17d fitted to the small diameter portion 13a. Is fixed by screwing a fixing bolt 29b inserted into the female screw hole 17j into the female screw hole 13k. On the other hand, in the intermediate die 19 to which the rotatable die 22 is fixed, the upper die side coupling member 17a in which the through hole 17c is fitted to the plurality of abutment portions 19a is fixed bolt 29a inserted into the female screw hole 17i. Is fixed by being screwed into the female screw hole 19d. Then, the upper die U to which the upper die side coupling member 17a is fixed is moved down the outer periphery of the upper die side coupling member 17a along the inner peripheral support surface 12b of the tubular member 12, and the upper die side coupling member 17a. And the lower mold side coupling member 17b are combined, and the radial engaging projections 5a and the engaging recesses 6b and the engaging recesses 5b and the engaging projections 6a are respectively engaged. As a result, the centers of the upper mold U and the lower mold B are aligned with the optical axis of the base spherical lens 20 supported by the lower mold B, and at the same time, the other surface 20c of the base spherical lens 20 and the aspherical surface of the aspherical mold 21. A molding space for molding the aspherical lens portion 7 is formed by the surface 21a. Note that S ₁ is a space formed by the recesses 17g and 17h formed on the inner surfaces of the upper mold side coupling member 17a and the lower mold side coupling member 17b.

A process for molding a complex aspherical lens using the main mold apparatus 11 assembled as described above will be described. First, the entire upper mold U 1 is lifted by, for example, gripping the gripping portion 22g and separated from the lower mold B. In this state, one surface 20a of the base spherical lens 20 is placed on the lens supporting protrusion 16b while fitting the outer periphery of the supporting cylindrical portion 13j of the base 13. Then, an appropriate amount of thermosetting resin is attached to the other concave surface 20 c of the base spherical lens 20.

In this state, the aspherical mold 21 is supported and the upper mold side coupling member 17a is fixed while the outer periphery of the upper mold side coupling member 17a is aligned with the inner peripheral support surface 12b of the tubular member 12. The upper die U is lowered to bring the abutting portion 19a of the intermediate die 19 into contact with the abutting flange 20b of the base spherical lens 20. As a result, the base spherical lens 20 elastically abuts against the abutting portion 19a, the position of the intermediate mold 19 or the aspherical mold 21 with respect to the aspherical surface 21a is defined, and a predetermined lens molding space is formed. At the same time, the upper mold side coupling member 17a and the lower mold side coupling member 17b respectively have a radial engaging convex portion 5a and an engaging concave portion 6b, and an engaging concave portion 5b and an engaging convex portion 6a. Engage. As a result, the centers of the upper mold U and the lower mold B are aligned with the optical axis of the base spherical lens 20 supported by the lower mold B. That is, the lens optical axis when the aspherical type 21 is considered as a lens and the lens optical axis of the base spherical lens 20 coincide with each other.

In this state, the thermosetting resin attached on the other surface 20c of the base spherical lens 20 is sandwiched between the aspherical surfaces 21a of the aspherical mold 21 and extends on the other surface 20c, and spreads thinly. Further, the fixing bolt 31 is rotated in a direction opposite to that when the rotatable die 22 is fixed, and is removed from the intermediate die 19 and the rotatable die 22. Then, when the rotatable mold 22 in the rotatable state is rotated in a proper direction with the center of the upper mold U, that is, the optical axis of the base spherical lens 20, as the center, the rotation is performed by the second automatic movement. It is transmitted to the aspherical surface type 21 via the centering coupling 28, and the aspherical surface 21a rotates with respect to the other surface 20c. As a result, the thermosetting resin sandwiched between the other concave surface 20c and the aspherical surface 21a can be spread more reliably in the molding space. After that, the fixing bolt 31 is inserted into the through hole 22e and screwed into the corresponding female screw hole 19e to fix the rotatable mold 22 to the intermediate mold 19, so that the aspherical mold 21 and the base spherical lens 20 are connected. The relative position of is determined.

The mold apparatus 11 thus set is placed in a heating furnace (not shown) and heated. Then, the heat from the heating furnace is transferred to the thermosetting resin mainly through the through hole 16a of the lens supporting member 16, the through hole 15a of the bottom plate 15, and the base spherical lens 20. As a result, the thermosetting resin is gradually hardened to form the aspherical lens portion 7, and a composite aspherical lens in which the aspherical lens portion 7 is attached to the base spherical lens 20 is formed. As described above, according to the main mold apparatus 11, the work of aligning the centers of the upper mold U and the lower mold B with the optical axis of the base spherical lens 20 supported by the lower mold B can be performed easily and accurately. Therefore, the workability can be improved by shortening the work time. Further, since the rotatable mold 22, that is, the aspherical mold 21, can be rotated about the optical axis of the base spherical lens 20 to more surely spread the thermosetting resin in the molding space, a large aspherical surface can be obtained. The lens can be manufactured efficiently.

Next, FIG. 6 shows a second embodiment of a molding apparatus for molding a composite aspherical lens using an ultraviolet curable resin. This molding die device has the following effects in addition to the effects of the molding die device of the first embodiment. That is, when a thermosetting resin is used, it does not need to follow the base spherical lens because the curing time is long and it shrinks gradually. However, when an ultraviolet curing resin is used, the curing time is short and it shrinks rapidly. There is a risk of peeling off the resin surface. In the molding die device of the second embodiment, the base spherical lens is made to follow the rapid contraction of the ultraviolet curable resin to prevent the mold and the resin surface from being separated from each other, and the compound aspherical lens is always molded with high accuracy. be able to.

In FIG. 6, the molding die apparatus 41 includes a lower die B ′ that supports one surface 50 a of the base spherical lens 50 and a non-spherical lens portion 37 for forming the aspherical lens portion 37 on the other surface 50 c of the base spherical lens 50. In order to support the spherical mold 51 and the aspherical mold 51 so as to face the other surface 50c of the base spherical lens 50 through a rotatable mold 52 that can be rotated about the optical axis of the base spherical lens 50. Mold U '. The mold unit 41 also has a first self-aligning coupling 47 having the same structure as the first self-aligning coupling 17 in the first embodiment. The first self-centering coupling 47 has an upper mold side coupling member 47a supported by an upper mold U'and a lower mold side coupling member 47b supported by a lower mold B '. When the mold side and lower mold side coupling members 47a and 47b are aligned with each other, the centers of the upper mold U'and the lower mold B'are aligned with the optical axis of the base spherical lens 50 supported by the lower mold B '. You can Further, the molding die device 41 has a tubular member 42 having a circular hole 42a, an inner peripheral support surface 42b, and a female screw hole 42c penetrating the circular hole 42a in the radial direction.

The lower mold B ′ has a base 43, a lens support member 46 supported by the base 43, and a bottom plate 45. The base 43 has a large diameter portion 43i and a small diameter portion 43a concentric with the large diameter portion 43i. An inner peripheral flange 43b is formed on the inner peripheral side of the small diameter portion 43a and has a support hole 43j that has a diameter substantially the same as the large diameter portion of the base spherical lens 50 and slidably supports the outer peripheral surface of the large diameter portion. There is. The base 43 also has a slide guide hole 43c, a fitting hole 43h, a space 43g, and female screw holes 43d and 43k in the large diameter portion 43i.

The lens support member 46 slidably fitted in the slide guide hole 43c is formed in an annular shape having a circular through hole 46a, and is arranged at an equal angular interval in the circumferential direction of the peripheral portion thereof. It has a plurality of lens support protrusions 46b which are projected upward. In the state where the lens support member 46 is fitted in the sliding guide hole 43c, the lens support protrusion 46b is restricted from moving upward by a predetermined amount or more by the inner peripheral flange 43b. The lens support member 46 also has recesses 46c for inserting the compression springs 48 at a plurality of positions in the circumferential direction.

The bottom plate 45 fitted in the fitting hole 43h is configured as an annular member having a larger diameter than the lens supporting member 46 and having a through hole 45a having the same diameter as the through hole 46a. The bottom plate 45 urges the lens support member 46 upward in FIG. 6 by abutting one end of the compression spring 48 at a position facing the recess 46c in the circumferential direction. As a result, the base spherical lens 50 is moved upward in FIG. 6 by the lens supporting member 46 until the lens supporting protrusion 46b contacts the inner peripheral flange 43b. The bottom plate 45 also has a through hole 45b at the peripheral edge thereof which faces the female screw hole 43d. In the base 43, the lens support member 46 is slidably fitted in the slide guide hole 43c, and the bottom plate 45 fitted in the fitting hole 43h is provided by compressing the compression spring 48 between the lens support member 46 and the recess 46c. It is fitted into the circular hole 42 a of the tubular member 42 while being fixed by the fixing bolt 54. The base 43 is further fixed to the tubular member 42 by a headless fixing screw 38 screwed into the female screw hole 42c of the tubular member 42 so as to be in the state shown in FIG.

The upper die U ′ has an intermediate die 49, a rotatable die 52, and a positioning die 54. The positioning die 54 has a concentric small-diameter portion 54a and a large-diameter portion 54b, and a concave portion 54c on the upper surface of the large-diameter portion 54b. The positioning die 54 further has a female screw hole 54d on the outer peripheral edge of the large diameter portion 54b, a cylindrical storage portion 54f on the inner circumference of the large diameter portion 54b, and a fitting hole 54h on the inner circumference of the small diameter portion 54a. have.

The intermediate die 49 has a small diameter portion 49a that fits into the tubular storage portion 54f without a gap, and a large diameter portion 49b that has a smaller diameter than the large diameter portion 54b and that is placed on the recess 54c. The intermediate die 49 also has a fitting hole 49c in the central portion of the large diameter portion 49b and female screw holes 49e and 49f in the outer peripheral edge portion. Further, the intermediate die 49 has a plurality of recesses 71 formed downward in the drawing in the circumferential direction of the small diameter portion 49a. A compression spring 72 is inserted into the plurality of recesses 71.

An abutting member 66 is interposed between the intermediate die 49 and the positioning die 54. The abutting member 66 has a large-diameter portion 66b and an abutting portion 66a protruding downward from the large-diameter portion 66b in FIG. A plurality of the abutting portions 66a are formed on the inner peripheral side of the abutting member 66 in the circumferential direction so as to project at equal angular intervals. The outer side surfaces of the plurality of abutting portions 66a are precisely formed so that they can be fitted into the fitting holes 54h of the positioning die 54 without any gap. The abutting member 66 is configured such that when the abutting portions 66a are fitted in the fitting holes 54h, the tips of the abutting portions 66a are all abutted against the outer peripheral edge of the base spherical lens 50 supported by the base 43. It is in contact with the attached flange 50b. At this time, the plurality of compression springs 72 inserted in the recesses 71 of the intermediate mold 49 elastically contact the upper surface of the abutting member 66, whereby the plurality of abutting portions 66a are urged downward. The combined spring force of the plurality of compression springs 72 is set to be smaller than the combined spring force of the plurality of compression springs 48.

The rotatable die 52 has a small diameter portion 52a which is fitted into the fitting hole 49c and protrudes inward of the intermediate die 49, and a diameter larger than the small diameter portion 52a and concentric with the small diameter portion 52a. It has a large diameter portion 52b that abuts the formed large diameter portion 49b of the intermediate die 49. The rotatable mold 52 is also formed in a cylindrical shape concentric with the large diameter portion 52b, and has a grip portion 52g protruding upward in FIG. 6, and an inner peripheral flat portion 52c located on the inner periphery of the grip portion 52g. Have The rotatable die 52 is further provided with a through hole 52d formed at the center of the inner peripheral flat portion 52c, a through hole 52e facing the female screw hole 49e of the intermediate die 49, and a lower portion of the small diameter portion 52a. It has a small diameter portion 52a and a cylindrical positioning portion 52f formed concentrically. In the rotatable mold 52 having such a configuration, the small diameter portion 52a is fitted into the fitting hole 49c, and the large diameter portion 52b is abutted against the large diameter portion 49b. The bolt 61 is fixed to the intermediate die 49 by being screwed into the female screw hole 49e of the intermediate die 49. Further, in the intermediate die 49, the small diameter portion 49a is fitted in the fitting hole 54f, and the large diameter portion 49b is abutted against the recess 54c. It is fixed to the positioning die 54 by being screwed into the hole 54d.

An aspherical mold 51 is supported by a rotatable mold 52 fixed to a positioning mold 54 via an intermediate mold 49 via a second self-centering coupling 58. This second self-aligning coupling 58 has the same structure as the second self-aligning coupling 28 in the first embodiment, and is a rotatable type coupling member 58a located on the upper side of FIG. And an aspherical side coupling member 58b located on the lower side. Both coupling members 58a and 58b are configured to have the same diameter, and have through holes 58c and 58d having the same diameter in the central portion.

A plurality of engaging projections 3a and engaging recesses 3b that are radially formed radially from the center are alternately formed on the peripheral edge of the rotatable mold-side coupling member 58a. Further, on the peripheral portion of the aspherical side coupling member 58b, a plurality of engaging convex portions 4a and engaging concave portions 4b radially formed from the center in the radial direction are alternately formed. Therefore, when the two coupling members 58a and 58b are aligned with each other in the vertical direction, the second self-aligning coupling 58 has the engaging projection 3a and the engaging recess 4b, and the engaging recess 3b and the engaging projection 3b. The portion 4a can be engaged with each other, and the centers of the through holes 58c and 58d can be easily and surely aligned with each other. The rotatable mold side coupling member 58a has bolt holes formed at equal angular intervals in the circumferential direction with the through hole 58c fitted in the tubular positioning portion 52f fitted with the intermediate plate 55. It is fixed to the rotatable mold 52 by a fixing bolt 56a inserted through 58i. The aspherical surface side coupling member 58b is inserted into the bolt holes 58j formed at equal angular intervals in the circumferential direction with the through hole 58d fitted in the fitting projection 51c of the aspherical surface mold 51. It is fixed to the aspherical mold 51 by the fixed bolts 56b.

The aspherical mold 51 includes an aspherical surface 51a facing the other concave surface 50c of the base spherical lens 50, a female screw hole 51b having an axial center at a position coinciding with the optical axis of the aspherical surface 51a, and It has a fitting protrusion 51c formed around the female screw hole 51b and a step 51d formed in a step shape on the outer periphery of the fitting protrusion 51c. Then, the aspherical mold 51 has the aspherical mold side coupling member 58b fixed, and the coupling member 58b is aligned with the rotatable mold side coupling member 58a on the rotatable mold 52 side. Further, it is fixed to the rotatable mold 52 side by a fixing bolt 53 which is inserted through the through hole 52d of the rotatable mold 52 through the intermediate plate 55. As a result, the centers of the aspherical mold 51 and the rotatable mold 52 are aligned. Further, the other surface 50c of the base spherical lens 50 is formed in a concave shape, and the aspherical surface 51a of the aspherical mold 51 facing the other surface 50c is formed in a convex shape. The part of the other surface 50c of the base spherical lens 50 is abutted against the aspherical surface 51a of the aspherical surface type 51 to be restricted. Reference numeral 65 in FIG. 6 is a ring member that prevents the fixing bolt 53 from coming off the rotatable mold 52.

The first self-centering coupling 47 has the same structure as the first self-centering coupling 17 in the first embodiment, and is on the upper die side fixed to the intermediate die 49 of the upper die U ′. It has a coupling member 47a and a lower mold side coupling member 47b fixed to the base 43 of the lower mold B '. The first self-centering coupling 47 supports the center of the upper mold U'and the lower mold B'to the lower mold B'when the upper mold side and lower mold side coupling members 47a and 47b are aligned with each other. It is aligned with the optical axis of the base spherical lens 50. The upper mold side and lower mold side coupling members 47a and 47b are formed in the same shape, and through holes 47c and 47d having the same diameter are formed in the respective central portions. Both coupling members 47a, 47b have a large number of engaging projections 5a, 6a and a large number of engaging recesses 5b, 6b on their peripheral edges facing each other.

That is, on the peripheral portion of the upper mold side coupling member 47a, a large number of engaging convex portions 5a and engaging concave portions 5b which are radially formed from the center are formed alternately. There is. Further, on the peripheral portion of the lower mold side coupling member 47b, a large number of engaging projections 6a and engaging recesses 6b radially formed from the center are alternately formed. Therefore, the first self-aligning coupling 47 engages with the engaging convex portion 5a, the engaging concave portion 6b, and the engaging concave portion 5b when the coupling members 47a and 47b are vertically aligned. The convex portions 6a can be engaged with each other, and the centers of the through holes 47c and 47d can be easily and surely aligned with each other. Both coupling members 47a, 47b have bolt holes 47i, 47j formed at equal angular intervals in the circumferential direction.

The base 43 fixed to the tubular member 42 has a lower mold side coupling member 47b having an outer peripheral surface fitted to the inner peripheral support surface 42b and a through hole 47d fitted to the small diameter portion 43a. Is fixed by screwing a fixing bolt 59b inserted into the female screw hole 47j into the female screw hole 43k. On the other hand, in the positioning mold 54 to which the rotatable mold 52 is fixed, the upper mold side coupling member 47a in which the through hole 47c is fitted in the small diameter portion 54a is fixed with the fixing bolt 59a inserted into the female screw hole 47i. It is fixed by being screwed into the female screw hole 54e.

As described above, while the outer periphery of the upper die side coupling member 47a is aligned with the inner peripheral surface of the tubular member 42, the upper die U ′ to which the upper die side coupling member 47a is fixed is lowered to move both cups. The ring members 47a and 47b are put together, and the opposing radial engaging projections 5a and engaging recesses 6b and the engaging recesses 5b and engaging projections 6a are engaged. As a result, the centers of the upper mold U ′ and the lower mold B ′ are aligned with the optical axis of the base spherical lens 50 supported by the lower mold B ′, and at the same time, the other surface 50c of the base spherical lens 50 and the aspherical mold 51. A molding space for molding the aspherical lens portion 37 is formed by the aspherical surface 51a. Note that S ₁ is a space formed by the recesses 47g and 47h on the inner surfaces of the upper mold side coupling member 47a and the lower mold side coupling member 47b.

A process for molding a composite aspherical lens using the main molding die device 41 assembled as described above will be described. First, the entire upper mold U'is raised by gripping the gripping portion 52g or the like to separate it from the lower mold B '. In this state, one surface 50a of the base spherical lens 50 is placed on the lens support protrusion 46b while fitting the outer periphery into the support hole 43j of the base 43, and the base spherical lens 50 is elastically supported by the compression spring 48. To do. Then, an appropriate amount of ultraviolet curing resin is attached to the other concave surface 50c of the base spherical lens 50.

In this state, the upper mold supporting the aspherical mold 51 and fixing the upper mold coupling member 47 a while keeping the outer periphery of the upper mold coupling member 47 a along the inner peripheral surface of the tubular member 42. U'is lowered to bring the abutting portions 66a into contact with the abutting flange 50b of the base spherical lens 50. Thereby, the base spherical lens 50 is elastically contacted with the abutting portion 66a to form a predetermined lens forming space. At the same time, the upper mold side coupling member 47a and the lower mold side coupling member 47b are aligned with each other, so that the engaging projections 5a and the engaging recesses 6b and the engaging recesses 5b and the engaging projections 6a are mutually provided. Are engaged. As a result, the centers of the upper mold U ′ and the lower mold B ′ are aligned with the optical axis of the base spherical lens 50 supported by the lower mold B ′. That is, the lens optical axis when the aspherical type 51 is considered as a lens and the lens optical axis of the base spherical lens 50 coincide with each other.

In this state, the ultraviolet curable resin attached on the other surface 50c of the base spherical lens 50 is sandwiched between the aspherical surfaces 51a of the aspherical mold 51 and extends on the other surface 50c, and spreads thinly. Further, the fixing bolt 61 is rotated in the direction opposite to that at the time of fixing and removed from the intermediate mold 49 and the rotatable mold 52. Then, when the rotatable mold 52 in the rotatable state is rotated in an appropriate direction around the center of the upper mold U ′, that is, the optical axis of the base spherical lens 50, the rotation of the rotatable mold 52 becomes the second direction. It is transmitted to the aspherical surface mold 51 via the self-aligning coupling 58, and the aspherical surface 51a rotates with respect to the other surface 50c. As a result, the ultraviolet curable resin sandwiched between the other concave surface 50c and the aspherical surface 51a can be more surely spread in the molding space. Then, the fixing bolt 61 is inserted into the through hole 52e and screwed into the corresponding female screw hole 49e to fix the rotatable mold 52 to the intermediate mold 49.

After that, when the ultraviolet curable resin on the other surface 50c is irradiated with ultraviolet rays through the through hole 46a of the lens supporting member 46, the through hole 45a of the bottom plate 45, and the base spherical lens 50, the ultraviolet curable resin is short-lived. Harden with. At this time, the ultraviolet curable resin contracts rapidly, but the compression spring 48 that biases the lens support member 46 upward overcomes the compression spring 72 that biases the plurality of abutting portions 66a downward, and Since the spherical lens 50 is made to follow the aspherical mold 51, the aspherical lens part 37 that is rapidly hardened in the molding space is properly molded without being separated from the base spherical lens 50 and the aspherical mold 51. Therefore, the ultraviolet curable resin can be molded as a highly accurate composite aspherical lens.

As described above, according to the main mold apparatus 41, it is easy and easy to align the centers of the upper mold U ′ and the lower mold B ′ with the optical axis of the base spherical lens 50 supported by the lower mold B ′. It can be performed reliably and the workability can be improved by shortening the work time. Further, since the rotatable mold 52, that is, the aspherical mold 51, can be rotated around the optical axis of the base spherical lens 50 so that the thermosetting resin in the molding space can be more surely spread, so that a large non-spherical mold can be used. A spherical lens can be manufactured efficiently. Further, even if an ultraviolet curable resin that rapidly contracts upon curing is used, the base spherical lens 50 follows the contraction of the resin, so that the compound aspherical lens can always be accurately molded.

In the first and second embodiments, the rotatable molds 22 and 52 have aspherical surfaces 21a and 51a having curvatures as shown in FIGS. 1 and 6, respectively. However, an aspherical surface type having an aspherical surface having a curvature different from that of the aspherical surfaces 21a and 51a can be exchanged and supported as needed.

[0047]

[Effect of device]

 As described above, according to the present invention, the work of aligning the centers of the upper mold and the lower mold with the optical axis of the base spherical lens supported by the lower mold can be performed easily and reliably, and the workability is improved. Therefore, a large aspherical lens can be efficiently manufactured.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a compound aspherical lens molding die device according to the present invention.

FIG. 2 is a plan view showing a lower mold side coupling member of the first self-aligning coupling.

FIG. 3 is a side view partially showing an engaged state of upper mold side and lower mold side coupling members of the first self-aligning coupling.

FIG. 4 is a plan view showing a lower mold side coupling member of a second self-centering coupling.

FIG. 5 is a side view partially showing an engaged state of rotatable and aspherical side coupling members of the second self-aligning coupling.

FIG. 6 is a sectional view showing a second embodiment of the compound aspherical lens molding die device according to the present invention.

[Explanation of symbols]

 7 37 Aspherical lens portion 17 47 First self-aligning coupling 17a 47a Upper mold side coupling member 17b 47b Lower mold side coupling member 20 50 Base spherical lens 20a 50a One surface 20c 50c Other surface 21 51 Aspherical surface type 22 52 Rotatable type 28 58 Second self-aligning coupling 28a 58a Rotatable type side coupling member 28b 58b Aspherical type side coupling member 48 72 Compression spring (biasing means) BB 'Lower die U U'Upper Type

Claims (7)

[Scope of utility model registration request] 1. A lower mold for supporting one surface of a base spherical lens; an aspherical surface mold for molding an aspherical lens portion on the other surface of the base spherical lens; an optical axis of the base spherical lens for the aspherical mold. An upper mold that faces and supports the other surface of the base spherical lens through a rotatable mold that can be rotated about the center; and an upper mold-side coupling member supported by the upper mold and a lower mold. A lower mold side coupling member to be supported, and when the upper mold side and the lower mold side coupling member are aligned with each other,
A compound aspherical lens molding die device, comprising: a self-centering coupling for aligning the centers of the upper mold and the lower mold with the optical axis of the base spherical lens supported by the lower mold. 2. The second self-centering coupling according to claim 1, further comprising a second self-centering coupling interposed between the aspherical type and the rotatable type. An aspherical side coupling member fixed to the rotary type die, and a rotatable type coupling member fixed to the rotatable type,
A composite aspherical lens molding die device configured such that when the aspherical mold side and the rotatable mold side coupling members are aligned with each other, the centers of the aspherical mold and the rotatable mold are aligned. 3. The compound aspherical lens molding die device according to claim 1, further comprising fixing means for fixing rotation of the rotatable mold. 4. The thermosetting resin according to claim 1, wherein a thermosetting resin is attached to the other surface of the base spherical lens, and the thermosetting resin is extended in a molding space defined by the other surface and the aspherical mold. Compound aspherical lens molding machine. 5. The structure according to claim 1, wherein an ultraviolet curable resin is attached to the other surface of the base spherical lens, and the ultraviolet curable resin is extended in a molding space formed by this other surface and the aspherical mold. Compound aspherical lens molding machine. 6. The composite aspherical lens molding die device according to claim 5, further comprising a biasing means for causing the base spherical lens to follow the contraction of the ultraviolet curable resin due to curing. 7. The optical surface of the base spherical lens according to claim 6, wherein the other surface of the base spherical lens is formed in a concave shape, and the aspherical aspherical surface facing the other surface of the concave surface is formed in a convex shape. The axial position is the aspherical type aspherical surface,
A compound aspherical lens molding die device in which a part of the other surface of the base spherical lens is regulated by hitting.