JP2008155577A - Lens molding mold and lens manufacturing method - Google Patents

Abstract

A lens molding die capable of integrally molding a lens frame even when the lens surface has a small curvature, and the curvature of the lens surface, in order to solve the problems of the prior art. Provided is a method of manufacturing a lens obtained by integrally molding a lens frame even if the lens is small.
The lens manufacturing method of the present invention includes a lens having a lens portion having a corner on the outer peripheral portion and an annular lens frame formed on the outer peripheral portion, and the lens frame is disposed on the outer peripheral portion of the lens portion. A method of manufacturing a lens manufactured by molding, the step of holding the outer periphery of the lens unit with a predetermined holding accuracy, the holding of the lens surface of the lens unit, and the release of the holding of the outer periphery of the lens unit A step of forming an annular cavity for molding the lens frame while holding the lens surface of the lens unit, and a step of filling the cavity with a molten resin.
[Selection] Figure 1

Description

  The present invention relates to a lens molding die for producing a lens portion and a lens having a lens frame (flange portion) formed on the outer periphery thereof, and a method for manufacturing the lens, and particularly, the lens surface has a small curvature. Even if it exists, it is related with the molding die for lenses which can shape a lens frame (flange part) with high accuracy, and can produce a lens with high molding accuracy, and a manufacturing method of this lens.

Currently, the lens frame (flange) has been changed from a metal one to a plastic one in order to reduce weight and size, and the plastic lens frame (flange) and plastic lens unit are integrated. There is a lens.
Such an integrated lens is manufactured by molding a lens part in advance and molding a lens frame (flange part) on the outer peripheral part of the lens part using a mold.
When an integrated lens is manufactured, it can be obtained if the lens frame has low molding accuracy, such as when the lens frame is tilted with respect to the optical axis of the lens unit or the center of the lens frame is misaligned with the optical axis. The lens will be of low quality. For this reason, a high precision is required for the molding accuracy of the lens frame with respect to the optical axis of the lens unit. For this reason, the lens portion is centered by using a bell clamp method to form a lens frame. As described above, various molding dies for producing a high-quality lens have been proposed (see Patent Document 1 and Patent Document 2).

In Patent Document 1, a lens (lens part) is inserted, and a lens frame (flange part) is formed by filling the outer peripheral part of the lens with a resin. The outer diameter of the lens is substantially the same as the outer periphery of the lens. A movable center having a bell clamp shape and a movable core having a bell clamp shape disposed opposite to the movable core, and a fixed core having a bell clamp shape and a distal end fitted to the movable core, and the center axis of the lens. A lens barrel integrated mold having an annular member capable of moving back and forth in a direction parallel to the lens is disclosed.
In the lens barrel integrated mold of Patent Document 1, the annular member is raised in the direction of the central axis of the lens, and centered by inserting the inner periphery of the lens so that the outer periphery of the lens is aligned. The lens is placed on the tip of the shape, and when the mold is closed, the lens is sandwiched and fixed between the tip of the bell clamp shape of the stationary core, so the lens centering mechanism is simplified, and the lens and mirror A lens barrel integrated product can be obtained which can be easily centered with the frame and does not have a resin missing portion on the lens storage wall of the lens frame (flange).

Patent Document 2 discloses that two separable molds having cavities larger than the outer diameter of a lens (lens part) to be inserted, and the respective molds so as to be positioned substantially at the center of the cavity. A lens holder having a tip portion smaller than the outer diameter of the lens for positioning the lens by sandwiching the lens from both sides before being filled with the resin, and having a minute amount over the entire circumference of the tip portion of the lens holder in contact with the lens A lens insert molding die having a curved surface is disclosed. Also in Patent Document 2, the lens is centered by the bell clamp method.
In Patent Document 2, a lens frame (flange) is formed on the outer peripheral portion of the lens by accurately matching the optical axis of the lens with the central axis of the lens holder without scratching the lens. In addition, it is possible to eliminate the need to increase the lens outer diameter.

JP 2004-66773 A JP 2004-98547 A

In the lens barrel integrated mold of Patent Document 1 and the lens insert mold of Patent Document 2, the lens is centered by the Berg clamp method. Accordingly, there is a problem that it can be applied only to a lens surface having a large curvature.
For this reason, in both the lens barrel integrated mold of Patent Document 1 and the lens insert molding mold of Patent Document 2, the lens positioning accuracy depends on the curvature of the lens surface, and the positioning accuracy of a lens with a large curvature is On the contrary, the positioning accuracy of a lens having a high curvature and a low curvature is low.

  An object of the present invention is to solve the above-described problems of the prior art, and a lens molding die capable of integrally molding a lens frame even when the lens surface has a small curvature, and a lens An object of the present invention is to provide a method for manufacturing a lens obtained by integrally molding a lens frame even if the curvature of the surface is small.

  In order to achieve the above object, a first aspect of the present invention is a lens molding die for a lens having a lens portion having a corner on an outer peripheral portion and an annular lens frame formed on the outer peripheral portion. A first mold that can be opened and closed, and a second mold, the first mold having a base portion and a flange portion having an opening at the center. A first lens holding member, a first lens holding member that is disposed in the opening and that holds a lens surface of the lens unit, and a bent portion that covers the flange portion of the first clamp member. A second mold that includes a base part and a flange part with an opening formed in the center, and that forms a pair with the first clamp member. And a holding part that is disposed in the opening and holds the lens surface of the lens part. A second lens holding member that forms a pair with the first lens holding member, and a bent portion that covers the flange portion of the second clamp member, and that forms a pair with the first mold member. And a pair of the first clamp member and the second clamp member, the lens portion is disposed between the opening portions, and the lens portion is sandwiched between the lens portions to have a predetermined holding accuracy. The pair of the first lens holding member and the second lens holding member hold the lens surface of the lens portion with a predetermined holding accuracy. The pair of the first mold member and the second mold member is configured such that when the first mold and the second mold are closed, the bent portions come into contact with each other. Forming the parting line, the first gold When the second mold is closed, the outer peripheral portion of the lens portion is held by the first clamp member and the second clamp member, and then the first lens holding member and the second clamp member are held. The lens surface is held by a lens holding member, the first clamp member and the second clamp part are separated by a predetermined distance to release the holding of the lens part, and the first lens holding member and The lens frame is formed by the second lens holding member, the first clamp member and the second clamp member, and the bent portions of the first mold member and the second mold member. An annular cavity is formed, and a lens molding die is provided.

  In the present invention, it is preferable that the first clamp member and the second clamp member have a slope formed on an end surface of each opening, and the outer periphery of the lens portion is held by the slope.

  According to a second aspect of the present invention, there is provided a lens molding die for a lens having a lens portion having a corner on the outer peripheral portion and an annular lens frame formed on the outer peripheral portion. The first mold is disposed and can be opened and closed, and the second mold has a first opening formed at the center of the surface of the first mold, and the first mold is formed on the surface. A first lens holding member is provided with a first cutout portion communicating with the first opening portion, and further comprising a holding portion that is disposed in the first opening portion and holds a lens surface of the lens portion. And a first holding member that protrudes from the first cutout portion and holds the outer peripheral portion of the lens portion, and the second mold is formed on the surface thereof. A cavity for forming the lens frame together with the first notch, and a second opening formed in the center A second notch portion is formed on the surface so as to communicate with the second opening portion, and a holding portion that is disposed in the second opening portion and holds the lens surface of the lens portion is provided. A second lens holding member that is paired with the first lens holding member, and a second holder that protrudes from the second notch and holds the outer periphery of the lens portion. A pair of the first lens holding member and the second lens holding member sandwiching the lens surface of the lens portion and holding them with a predetermined holding accuracy; When the first mold and the second mold are closed, the lens surface is held by the first lens holding member and the second lens holding member, and the first holding tool and The outer periphery of the lens unit is held by the second holder Is, by the first notch and the second notch portion, there is provided a lens mold, wherein the cavity is formed.

In the present invention, it is preferable that at least three of the first holder and the second holder are provided at equal intervals.
In the present invention, it is preferable that the first holder and the second holder are provided at different positions.
Furthermore, in the present invention, the first holding tool and the second holding tool have a slope formed at a tip portion in contact with the outer peripheral portion of the lens portion, and hold the outer peripheral portion of the lens portion by the slope. It is preferable.

  According to a third aspect of the present invention, there is provided a lens having a lens portion having a corner on the outer periphery and an annular lens frame formed on the outer periphery, and the lens frame on the outer periphery of the lens portion. A method of manufacturing a lens manufactured by molding, the step of holding the outer peripheral portion of the lens portion with a predetermined holding accuracy, and the outer peripheral portion of the lens portion while holding the lens surface of the lens portion A step of releasing the holding, a step of forming an annular cavity for molding the lens frame while holding the lens surface of the lens unit, and a step of filling the cavity with a molten resin A lens manufacturing method is provided.

  Further, according to a fourth aspect of the present invention, there is provided a lens having a lens portion having a corner on an outer peripheral portion and an annular lens frame formed on the outer peripheral portion, and the lens frame on the outer peripheral portion of the lens portion. A method of manufacturing a lens that is molded using a pair of first mold and second mold, wherein the pair of first mold and second mold are movable in an opening and closing direction. A pair of first and second clamp members that sandwich the lens portion and hold the outer peripheral portion of the lens portion with a predetermined holding accuracy, and a lens surface of the lens portion with a predetermined holding accuracy. When the pair of the first lens holding member and the second lens holding member, and the first mold and the second mold held by the pair are closed, a pair of forming a parting line is formed. A first mold member and a second mold member, wherein the first mold and the first mold member A step of disposing the lens portion between the first and second molds, and holding the outer peripheral portion of the lens portion with a predetermined holding accuracy by the first clamp member and the second clamp member; and a first lens holding member. The lens surface of the lens unit is held by the second lens holding member and the first clamp member and the second clamp member are separated by a predetermined distance to release the holding of the outer peripheral portion of the lens unit. And the first lens holding member, the second lens holding member, the first clamp member, the second clamp member, and the first lens holding member while holding the lens surface of the lens unit. A step of forming an annular cavity for molding the lens frame by the bent portions of the first mold member and the second mold member, and filling the cavity with molten resin There is provided a method of manufacturing a lens characterized by having a degree.

  Further, according to a fifth aspect of the present invention, there is provided a lens having a lens portion having a corner on the outer periphery and an annular lens frame formed on the outer periphery, and the lens frame on the outer periphery of the lens portion. A method of manufacturing a lens that is molded using a pair of first mold and second mold, wherein the pair of first mold and second mold are movable in an opening and closing direction. A pair of first lens holding member and second lens holding member that hold the lens surface of the lens part with a predetermined holding accuracy, a first holding tool that holds an outer peripheral part of the lens part, and A first notch and a second notch that form a cavity for forming the lens frame when the second holder, the first die, and the second die are closed. The lens unit is disposed between the first mold and the second mold, and the first mold The mold and the second mold are closed, the lens surface of the lens portion is held by the first lens holding member and the second lens holding member, and the first holding tool and the second holding Holding the outer periphery of the lens part with a tool, and forming a cavity by the first notch part and the second notch part, and filling the cavity with a molten resin A method for manufacturing a lens is provided.

  According to the lens molding die of the first aspect of the present invention and the lens molding die of the second aspect of the present invention, since the holding accuracy of the lens portion can be increased, the inclination of the optical axis, etc. It can be made small, and the accuracy with respect to the optical axis of the lens barrel to be molded can be increased. For this reason, the molding accuracy of the finally obtained lens can be increased, and a lens with excellent quality can be obtained.

In addition, according to the lens molding die of the first aspect of the present invention, the lens surface of the lens portion is held in order to hold the outer peripheral portion of the lens portion by the first clamp member and the second clamp member. Unlike the bell clamp system, the lens surface is not affected by the curvature of the lens surface when held.
Furthermore, according to the lens molding die of the second aspect of the present invention, the lens surface is held by the first lens holding member and the second lens holding member, and the first holding tool and the second holding tool. Therefore, unlike the conventional bell clamp system that holds the lens surface of the lens unit, the influence of the curvature of the lens surface can be reduced when holding the lens unit.

  Furthermore, according to the lens manufacturing method of the third aspect of the present invention and the lens manufacturing method of the fourth aspect of the present invention, after holding the outer peripheral portion of the lens portion with a predetermined holding accuracy, the lens of the lens portion While holding the surface, releasing the holding of the outer peripheral portion of the lens portion, and holding the lens surface of the lens portion, after forming an annular cavity for molding the lens frame, melt resin into this cavity Since the lens portion is filled, the holding accuracy of the lens unit can be increased, so that the inclination of the optical axis can be reduced and the accuracy of the molded lens frame with respect to the optical axis can be increased. For this reason, the molding accuracy of the finally obtained lens can be increased, and a lens with excellent quality can be obtained.

In addition, according to the lens manufacturing method of the third aspect of the present invention and the lens manufacturing method of the fourth aspect of the present invention, unlike the conventional bell clamp system that holds the lens surface of the lens section, the lens section When held, it is not affected by the curvature of the lens surface.
Furthermore, according to the lens manufacturing method of the fifth aspect of the present invention, the lens surface is held by the first lens holding member and the second lens holding member, and the first holding tool and the second holding tool are used. Since the outer peripheral portion of the lens portion is held, unlike the conventional bell clamp system that holds the lens surface of the lens portion, the influence of the curvature of the lens surface can be reduced when holding the lens portion.

Hereinafter, a lens molding die and a method for manufacturing a lens according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
FIG. 1 is a schematic cross-sectional view showing a lens molding die according to the first embodiment of the present invention. FIG. 1 shows a state in which the lens molding die 10 is closed. FIG. 2 (a) is a schematic perspective view showing a lens manufactured by the lens molding die according to the first embodiment of the present invention, and FIG. 2 (b) is a first embodiment of the present invention. It is typical sectional drawing which shows the lens produced with the lens shaping die which concerns on a form.

In the lens molding die 10 of the present embodiment, for example, a lens 70 (see FIG. 2A) in which an annular lens frame 76 is formed on the outer peripheral portion 72a of the lens portion 72 (see FIG. 2A). The annular lens frame 76 is insert-molded on the outer peripheral portion 72a of the lens portion 72 formed in advance. This lens part 72 is a bonding lens part comprised by the 1st bonding lens 74a and the 2nd bonding lens 74b.
Moreover, when forming the lens part 72 (the 1st bonding lens 74a, the 2nd bonding lens 74b) with resin, a polycarbonate (PC), polymethyl methacrylate (PMA), and ZEONEX (trademark), for example. ) Etc. can be used. In addition to this, the lens portion 72 can be formed of glass or ceramics. The lens frame 76 can be formed of, for example, polycarbonate (PC).
Further, the lens unit 72 is not particularly limited as long as it is a single lens. Examples include plano-convex lenses, plano-concave lenses, biconvex lenses, biconcave lenses, convex meniscus lenses, concave meniscus lenses, and aspheric lenses.

  As shown in FIG. 1, a lens molding die 10 has a first mounting plate 12, a fixed side die (first die) 14, and a movable side die (second die) 16. And an opening / closing mechanism (not shown) for opening / closing the first mounting plate 12, the fixed mold 14 and the movable mold 16 in the opening / closing direction V, and a controller for controlling the opening / closing mechanism. (Not shown) is provided. Thus, the first mounting plate 12, the fixed mold 14 and the movable mold 16 can be opened and closed according to the lens manufacturing process.

  The first mounting plate 12 is for injecting molten resin from a molding machine (not shown) into the cavity C formed by the fixed side mold 14 and the movable side mold 16. The first mounting plate 12 has a sprue 12c formed at the center of the front surface 12a, and a runner 12d that communicates with the sprue 12c and reaches the back surface 12b. A molding machine is connected to the inlet 12e of the sprue 12c, and molten resin is injected from the inlet 12e.

  The fixed side mold 14 includes a fixed side plate 18, a fixed contact plate 22, a first clamp member 24, a first mold member 30, and a first lens holding member 38.

The fixed side plate 18 is provided so that the front surface 18 b is in contact with the back surface 12 b of the first mounting plate 12. The fixed side plate 18 has a receiving portion 20a and a guide hole 20b formed on the back surface 18a.
Further, the fixed side plate 18 has a recess 18c formed from the surface 18b side. An opening 18c that communicates with the recess 18c and reaches the back surface 18a is formed. At the boundary between the recess 18c and the opening 18d, a notch 18e is formed along the inner surface of the opening 18c.
A runner 20 reaching the back surface 18a is formed at the bottom of the recess 18c.

  The fixed plate 22 is fitted into the concave portion 18 c of the fixed side plate 18, and is provided in contact with the back surface 12 b of the first mounting plate 12 together with the fixed side plate 18. The fixing plate 22 has a hot water reservoir 22 a formed on the first mounting plate 12 side at a position facing the sprue 12 c of the first mounting plate 12. Further, a runner 22 b is formed on the fixed plate 22 so as to communicate with the runner 20 of the fixed side plate 18.

The first clamp member 24 is paired with a second clamp member 50 of the movable mold 16 described later, and the first clamp member 24 and the second clamp member 50 form a lens portion 72 (see FIG. 2 (a)), the lens unit 72 is held at a predetermined accuracy by maintaining the inclination of the optical axis of the lens unit 72, the deviation of the position of the optical axis, etc. at a predetermined accuracy (predetermined holding accuracy). Is.
The first clamp member 24 includes a base portion 26 and a flange portion 28. A through hole 24 a is formed in the base portion 26 at a position that is aligned with and communicates with the opening portion 18 d of the fixed side plate 18. The end of the through hole 24a on the surface 26a side is chamfered, and an inclined surface 26c (see FIG. 7A) is formed.

In addition, a runner 24 b is formed in the base portion 26 so as to communicate with the runner 20 of the fixed side plate 18. The runner 24 b reaches the surface 26 a of the base portion 26.
A guide hole 28 a is formed in the flange portion 28 at a position aligned with the guide hole 20 b of the fixed side plate 18.
A storage portion 28 b is formed on the back surface 26 b of the base portion 26 at a position aligned with the storage portion 20 a of the fixed side plate 18.

The first mold member 30 is provided so as to cover the first clamp member 24 and is paired with a second mold member 56 of the movable mold 16 described later. When the fixed mold 14 and the movable mold 16 are closed, the first mold member 30 and the second mold member 56 form a parting line PL (see FIG. 5).
The first mold member 30 is a box-shaped member, and an opening 32 a is formed in the lower surface portion (folded portion) 32. The first clamp member 24 is provided such that the side surface 26 b of the base portion 26 is in contact with the inner peripheral surface of the opening portion 32 a of the first mold member 30 and the flange portion 28 is in contact with the lower surface portion 32.

The first mold member 30 has an internal height higher than the thickness of the flange portion 28 of the first clamp member 24, and is between the flange portion 28 of the first clamp member 24. A gap s is generated.
Further, a through hole 32 b is formed in the first mold member 30 at a position aligned with the guide hole 28 a of the flange portion 28 of the first clamp member 24.
Further, the first mold member 30 is formed with a guide hole 32c into which a second guide pin 62 described later is inserted.

The first lens holding member 38 is paired with a second lens holding member 66 to be described later. The first lens holding member 38 and the second lens holding member 66 are used to form the lens surface (the lens surface 72). The lens surface 72b (see FIG. 2 (b)) and the lens back surface (lens surface) 75a (see FIG. 2 (b)) are sandwiched, and the inclination of the optical axis of the lens unit 72, the deviation of the optical axis position, etc. are predetermined. The lens portion 72 (the corners 72b and 72c (see FIG. 7A) of the outer peripheral portion 72a) is held in the lens storage portion 68 with the accuracy of the above described.
The first lens holding member 38 is a substantially cylindrical member having a bottom portion 38a, and a spring 40 is provided in the inside 38b. Further, the bottom portion 38a is provided with a ring-shaped holding portion 38c.
A flange portion 38d is formed on the outer peripheral surface of the end portion of the first lens holding member 38 opposite to the bottom portion 38a.
The first lens holding member 38 is disposed across the opening 18 d of the fixed side plate 18 and the through hole 24 a of the first clamp member 24. The flange portion 38 d of the first lens holding member 38 is engaged with the notch portion 18 e of the fixed side plate 18.

  A first return spring 34 is provided across the storage portion 20 a of the fixed side plate 18 and the storage portion 28 b of the first clamp member 24. By the first return spring 34, the flange portion 28 of the first clamp member 24 is urged toward the lower surface portion 32 side of the first mold member 30.

A first hole that is inserted through the guide hole 20 b of the fixed side plate 18, the guide hole 28 a of the first clamp member 24, and the through hole 32 b of the first mold member 30 and protrudes from the through hole 32 b of the first mold member 30. The guide pin 36 is provided.
The first guide pin 36 is provided for positioning the fixed side mold 14 and the movable side mold 16 together with a second guide pin 62 of the movable side mold 16 described later when the mold is closed. Yes.

  The movable side mold 16 includes a second mounting plate 42, a movable side plate 46, a second clamp member 50, a second mold member 56, and a second lens holding member 66. The movable side mold 16 is movable in the opening / closing direction V with respect to the fixed side mold 14.

  The second mounting plate 42 is provided at the lowermost part of the movable mold 16 and has a through hole 44a through which the ejector pin 64 is inserted.

The movable side plate 46 is provided in contact with the front surface 42a of the second mounting plate 42 and the back surface 46b.
The movable side plate 46 is formed with a through hole 46 c that communicates with the through hole 44 a formed in the second mounting plate 42.
The movable side plate 46 is formed with a storage portion 46d and a guide hole 48 on the surface 46a.
Further, the movable side plate 46 is formed with an opening 46e substantially at the center thereof. At the end of the opening 46e on the back surface 46b side, a notch 46f is formed along the inner surface of the opening 46e.

The second clamp member 50 holds the lens portion 72 in the lens storage portion 68 with a predetermined holding accuracy together with the first clamp member 24 of the fixed mold 14.
The second clamp member 50 basically has the same configuration as that of the first clamp member 24. The second clamp member 50 includes a base portion 52 and a flange portion 54. A through hole 50 a that communicates with the opening 46 e of the movable side plate 46 is formed in the base 52. The end of the through hole 50a on the surface 52a side is chamfered, and a slope 52c (see FIG. 7A) is formed.

In addition, an ejector hole 54 c communicating with the ejector hole 46 c of the movable side plate 46 is formed in the base 52. The ejector hole 54c reaches the surface 52a of the base 52.
A guide hole 54 a is formed in the flange portion 54 at a position aligned with the guide hole 48 of the movable side plate 46.
A storage portion 54 b is formed on the back surface 52 b of the base portion 52 at a position aligned with the storage portion 46 d of the movable side plate 46.

  An ejector pin 64 is inserted into the through hole 44a of the second mounting plate 42, the ejector hole 46c of the movable side plate 46, and the ejector hole 54c of the flange portion 54. The ejector pin 64 is an ejector device (not shown). Thus, it can project from the surface 52a of the second clamp member 50.

The second mold member 56 is provided so as to cover the second clamp member 50, and the second mold member 56 together with the first mold member 30 of the fixed mold 14 is parting line. PL (see FIG. 5) is formed.
The second mold member 56 is a box-shaped member, and an opening 58 a is formed in the upper surface portion (folded portion) 58. The second clamp member 50 is provided such that the side surface 52 b of the base 52 is in contact with the inner peripheral surface of the opening 58 a of the second mold member 56.

  A second return spring 60 is provided across the storage portion 46 d of the movable side plate 46 and the storage portion 54 b of the second clamp member 50. By the second return spring 60, the second clamp member 50 is urged so that the flange portion 54 contacts the upper surface portion 58 of the second mold member 56.

Note that the second mold member 56 has an inner height higher than the thickness of the flange portion 54 of the second clamp member 50 and is biased by the second return spring 60, A gap s is generated between the clamp member 50 and the flange portion 54.
Further, a through hole 58 b is formed in the second mold member 56 at a position aligned with the guide hole 54 a of the flange portion 54 of the second clamp member 50.
Further, the second mold member 56 is formed with a guide hole 58c into which the first guide pin 62 is inserted.

The second lens holding member 66, together with the first lens holding member 38, holds the lens portion 72 with a predetermined accuracy.
The second lens holding member 66 is a member in which a concave portion is formed at one end of a cylinder and a ring-shaped holding portion 66a is formed. A flange portion 66 c is formed on the outer peripheral surface of the other end portion of the second lens holding member 66.
The second lens holding member 66 is disposed across the opening 46 e of the movable side plate 46 and the through hole 50 a of the second clamp member 50. The flange portion 66 c of the second lens holding member 66 is engaged with the cutout portion 46 f of the movable side plate 46.

  It is inserted through the guide hole 48 of the movable side plate 46, the guide hole 54a of the second clamp member 50, and the through hole 58b of the second mold member 56, and protrudes from the through hole 58b of the second mold member 56. A second guide pin 62 is provided. The second guide pin 62 is provided for positioning the fixed side mold 14 and the movable side mold 16 together with the first guide pin 32 when the mold is closed.

  In the lens molding die 10 of the present embodiment, when the fixed side mold 14 and the movable side die 16 are closed, a lens storage portion 68 is formed, the inclination of the optical axis of the lens portion 72, and the position of the optical axis. Is maintained at a predetermined accuracy (predetermined holding accuracy), and the inclined surface 26c of the first clamp member 24 and the inclined surface 52c of the second clamp member 52 provide a corner 72b of the outer peripheral surface 72a of the lens portion 72, 72c is held. In this way, the lens unit 72 is held in the lens storage unit 68.

In the lens molding die 10 of this embodiment, when the movable die 16 is further moved toward the fixed die 14, the first clamp member 24 is moved upward by the second guide pin 62. The second clamp member 50 is pressed downward by the first guide pin 36. For this reason, the lens portion 72 is released from the holding by the inclined surface 26c of the first clamp member 24 and the inclined surface 52c of the second clamp member 52, and the first clamp member 24 and the second clamp member 52 are fixed to each other. An annular cavity C is formed at a distance. This cavity C becomes a space to which the molten resin that becomes the annular lens frame 76 is supplied. The distance in the opening / closing direction V of the space (the thickness of the lens frame 76) is determined by the gap s between the first mold member 30 and the flange portion 28 of the first clamp member 24, and the second mold member 56 and the second. This is appropriately determined according to the gap s between the clamp member 50 and the flange portion 54. Thus, the distance in the opening / closing direction V of the cavity C that becomes the lens frame 76 can be adjusted, and the thickness of the lens frame 76 can be adjusted.
The width of the lens frame 76 is defined by the length in the horizontal direction H perpendicular to the opening / closing direction V of the surface 26a of the first clamp member 24 and the surface 52a of the second clamp member 50.

Simultaneously with the release of the holding by the first clamp member 24 and the second clamp member 52, the first lens holding member 38 and the second lens holding member 66 cause the lens portion 72 to have a predetermined accuracy of the optical axis. To be held. In this case, the surfaces 30a and 56a of the first mold member 30 and the second mold member 56 are combined to close the mold.
As described above, in the lens molding die 10 of the present embodiment, after the lens portion 72 is held by the first clamp member 24 and the second clamp member 52, the lens portion 72 is The first lens holding member 38 and the second lens holding member 66 hold the optical axis with a predetermined accuracy. At this time, the first lens holding member 38 and the second lens holding member 66 hold the lens portion 72 and exhibit a sealing function that prevents the molten resin from flowing into the lens housing portion 68. As described above, when the first lens holding member 38 holds the lens portion 72 together with the second lens holding member 66, an excessive force applied to the lens portion 72 is absorbed by the spring 40, and the excessive force is applied to the lens portion 72. Acting is suppressed. Thereby, the lens unit 72 is held with a predetermined holding accuracy.

  In the lens molding die 10 of the present embodiment, the lens frame 76 can be molded by a series of operations as described above. In addition, since the holding accuracy of the lens unit 72 can be increased, the inclination of the optical axis can be reduced, and the accuracy of the molded lens frame 76 with respect to the optical axis can be increased. From this, the molding accuracy of the lens 70 finally obtained can be increased, and the lens 70 with excellent quality can be obtained.

  In the lens molding die 10 of the present embodiment, the lens surface of the lens portion 72 is held in order to hold the corners 72b and 72c of the lens portion 72 by the first clamp member 24 and the second clamp member 52. Unlike the conventional bell clamp system, the lens portion 72 is not affected by the curvature of the lens surface when held. Further, even a lens portion having a flat surface on one side can be held.

  In the lens molding die 10 of this embodiment, the sprue 12c and runner 12d of the first mounting plate 12, the runner 22b of the fixed plate 22, the runner 20 of the fixed side plate 18, and the first clamp member 24 The runner 24b constitutes a supply path for supplying the molten resin to the cavity C. In FIG. 1, only one supply path is illustrated. However, in the lens molding die 10 of the present embodiment, the number of the first clamp member 24 is not one, for example, in the horizontal direction H. Three are provided at equal intervals (120 ° intervals) with respect to the surface 26 a of the base portion 26.

  Also, only one ejector pin 64 is shown in FIG. 1, but in the lens molding die 10 of the present embodiment, instead of one, for example, in the horizontal direction H, the second Three are provided at equal intervals (120 ° intervals) with respect to the surface 52 a of the base 52 of the clamp member 50.

  Further, only one of the first guide pin 32 and the first return spring 34, and the second guide pin 64 and the second return spring 60 are shown in FIG. The shape of the lens molding die 10 is not limited to one, and a plurality of lens molding dies 10 may be provided so as to obtain a predetermined positioning accuracy. As described above, the numbers of the first guide pins 32 and the first return springs 34, and the second guide pins 64 and the second return springs 60 are appropriately changed.

Next, the manufacturing method of the lens of this embodiment will be described in detail with reference to FIGS. 2 (a) and 2 (b) and FIGS. 3 to 7 (a) and 7 (b).
3-6 is typical sectional drawing which shows the manufacturing method of the lens using the lens shaping die of this embodiment in order of a process. FIG. 7A is a schematic cross-sectional view showing an enlarged main part in order to explain the mold closing process of the lens manufacturing method using the lens molding die of the present embodiment, and FIG. FIG. 3 is a schematic cross-sectional view showing an enlarged main part for explaining a lens frame forming step of a lens manufacturing method using the lens forming mold of the present embodiment.

  When the lens 70 is manufactured using the lens molding die 10 of the present embodiment, first, the lens portion 72 is prepared in advance. In this case, the outer peripheral portion 72a of the lens portion 72 is ground, the outer peripheral portion 72a of the lens portion 72 has a corner, and the eccentricity of the outer peripheral portion 72a with respect to the optical axis of the lens portion 72 is further reduced.

  Next, as shown in FIG. 3, the movable mold 16 is opened with respect to the fixed mold 14, and, for example, the lens portion 72 is placed between the first lens holding member 38 and the second lens holding member 66. The stationary mold 14 and the movable mold 16 are closed. At this time, the first guide pin 36 is inserted into the guide hole 58c and the second guide pin 62 is inserted into the guide hole 32c, so that the stationary mold 14 and the movable mold 16 are positioned. .

Further, when the fixed side mold 14 and the movable side mold 16 are closed, as shown in FIG. 4, the lens unit 72 is held by being sandwiched between the first clamp member 24 and the second clamp member 50. Is done.
More specifically, as shown in FIG. 7A, the holding of the lens portion 72 by the first clamp member 24 and the second clamp member 50 is such that the corner 72b of the outer peripheral portion 72a of the lens portion 72 is the first. The clamp member 24 is in contact with the inclined surface 26c, and the corner 72c of the outer peripheral portion 72a of the lens portion 72 is held in contact with the inclined surface 52c of the second clamp member 50. At this time, although the first clamp member 24 is biased by the first return spring 34, an excessive force does not act on the corner 72 b of the lens portion 72 due to the elastic force of the first return spring 34. Further, although the second clamp member 50 is biased by the second return spring 60, an excessive force does not act on the corner 72 c of the lens portion 72 due to the elastic force of the second return spring 60. As a result, damage to the corners 72b and 72c of the lens unit 72 can be prevented.

  Further, since the lens portion 72 has a small eccentricity with respect to the optical axis of the outer peripheral portion 72a, each corner 72b, 72c of the lens portion 72 is caused by the inclined surface 26c of the first clamp member 24 and the inclined surface 52c of the second clamp member 50, respectively. By holding, the lens portion 72 can be held in the lens storage portion 68 of the lens molding die 10 with a predetermined holding accuracy.

Next, as shown in FIG. 5, the movable mold 16 is further moved toward the fixed mold 14, and the movable mold 16 is pressed against the fixed mold 14 with a predetermined force to clamp the mold. To do.
In this case, the surface 32a of the first mold member 30 and the surface 60a of the second mold member 60 are in contact with each other to form the parting line PL. At this time, as shown in FIG. 7B, the tip 39 of the holding portion 38c of the first lens holding member 38 contacts the lens back surface 75a of the lens portion 72, and the holding portion 66a of the second lens holding member 66. The first lens holding member 38 and the second lens 67 are brought into contact with the lens surface 75b of the lens portion 72 and the predetermined holding accuracy of the first clamp member 24 and the second clamp member 50 is maintained. The lens portion 72 is held by the lens holding member 66.
When the first lens holding member 38 holds the lens portion 72 together with the second lens holding member 66, excessive force is absorbed by the lens portion 72 by the spring 40, and no large force acts on the lens portion 72.

Further, the second clamp member 50 is pressed against the surface 46 a of the movable side plate 46 against the second return spring 60 by the first guide pin 36.
Further, the first clamp member 24 is pressed against the back surface 18 a of the fixed side plate 18 against the first return spring 34 by the second guide pin 62. As a result, the first clamp member 24 and the second clamp member 50 are separated from each other, and the holding of the lens portion 72 is released. Then, the lens unit 72 is switched to being held by the first lens holding member 38 and the second lens holding member 66. Further, when the first clamp member 24 is pressed against the back surface 18 a of the fixed side plate 18, the runner 20 of the fixed side plate 18 and the runner 24 b of the first clamp member 24 communicate with each other. The sprue 12 c and the runner 12 d and the runner 22 b of the fixed plate 22 are also communicated. Thereby, a supply path for supplying the molten resin to the cavity C from the injection port 12e of the first mounting plate 12 is formed.

Next, a molten resin for forming the lens frame 76 is supplied from a molten resin supply source such as an injection device to the injection port 12e of the first mounting plate 12 at a predetermined injection pressure. Accordingly, as shown in FIG. 5, the molten resin 80 is sprue 12 c and runner 12 d of the first mounting plate 12, runner 22 b of the fixed plate 22, runner 20 of the fixed side plate 18, and runner of the first clamp member 24. 24 b is supplied to the cavity C, and the cavity C is filled with the molten resin 80.
At this time, as shown in FIG. 7B, the lens portion 72 is sandwiched and held by the first lens holding member 38 and the second lens holding member 66, and these first lens holding members. 38 and the second lens holding member 66 serve as a sealing member for preventing the molten resin 80 from entering the lens housing portion 68. For this reason, the molten resin 80 does not enter the lens housing portion 68, and the molten resin 80 is not used except for the molding of the lens frame 76.

Next, when the molten resin is cured after a predetermined time has elapsed, a lens frame 76 is formed. Thereafter, as shown in FIG. 6, the movable mold 16 is separated from the fixed mold 14 and the mold is opened. Then, the ejector device causes the ejector pin 64 to protrude upward, the lens frame 76 is supported by the ejector pin 64, and the lens 70 is held above the movable mold 16. Thereby, the lens 70 can be easily taken out from the lens molding die 10.
When the mold is opened, the fixed side mold 14 is also separated from the first mounting plate 12. As a result, the runner member 82 formed by cooling the molten resin 80 supplied when forming the lens frame 76 is removed from the stationary mold 14.

  The lens frame 76 can be formed on the outer peripheral portion 72a of the lens portion 72 as shown in FIGS. 2A and 2B by the method of manufacturing the lens 70 using the lens molding die 10 of the present embodiment. .

  In the lens molding die 10 of this embodiment and the method for manufacturing the lens 70 using the lens molding die 10, the lens portion 72 can be held with high accuracy, and this state is maintained and the lens frame 76 is maintained. Is molded. For this reason, the molding accuracy of the lens frame 76 with respect to the optical axis of the lens 70 can be increased. Thereby, when the lens frame 76 is set as the reference position, the optical axis accuracy of the lens can be increased. Thus, in the manufacturing method of the lens 70 by the lens molding die 10 of the present embodiment, the lens 70 with excellent molding accuracy and excellent quality can be manufactured.

Further, in the lens molding die 10 of this embodiment and the method for manufacturing the lens 70 using the lens molding die 10, the lens surface 72 is held at the corners 72 b and 72 c. Large or small can be held. Furthermore, if there is a corner, it can be held even if one side of the lens portion is constituted by a flat surface. Thus, the lens part 72 can be held without depending on the curvature of the lens surface of the lens part 72.
For this reason, the lens frame 76 can be formed without depending on the curvature of the lens surface of the lens portion 72.

  In the lens molding die 10 of the present embodiment, the inclined surface 26c of the first clamp member 24 and the inclined surface 52c of the second clamp member 50 are configured to hold corners, but the present invention is not limited thereto. Instead of this, the lens surface of the lens unit may be directly held.

Next, a second embodiment of the present invention will be described.
FIG. 8 is a schematic perspective view showing a main part of a lens molding die according to the second embodiment of the present invention, with a part cut away.
In this embodiment, the same components as those of the lens molding die 10 of the first embodiment shown in FIGS. 1 and 3 to 7A and 7B are denoted by the same reference numerals. Detailed description is omitted.

The lens molding die 100 of the present embodiment has a movable side die (second die) 102 and a fixed side die as compared with the lens molding die 10 (see FIG. 1) of the first embodiment. The configuration of the mold (first mold) 104 is different, the holding method of the lens portion 72 is different, and the other configurations are the same as the configuration of the lens molding die 10 of the first embodiment. The detailed explanation is omitted.
Further, in the lens molding die 100 according to the present embodiment, the fixed-side mold 104 includes the first shape member 30 (see FIG. 1) and the first molding member 10 as compared with the lens molding die 10 according to the first embodiment. One clamp member 24 (see FIG. 1) is integrally formed. Furthermore, the movable mold 102 is formed by integrally forming the second shape member 56 (see FIG. 1) and the second clamp member 52 (see FIG. 1).

  The movable die 102 has a second notch 106 having a circular shape in plan view with the center (not shown) of the movable die 102 as the center on the surface 102a. A second opening 102b is formed at the center of the second notch 106 (the center of the movable mold 102). A second lens holding member 66 is provided in the second opening 102b. The second notch portion 106 communicates with the second opening portion 102b.

Claw portions (first holders) 112 protrude from the second notch 106 at the edge of the bottom surface 106a of the second notch 106 in contact with the second opening 102b. It is formed at equal intervals (120 ° intervals) with the center of the mold 102 as the center.
The claw portion 112 has an inclined surface 112a that decreases in height toward the opening 102a. The inclined surface 112 a contacts the outer peripheral portion (corner) of the lens portion 72. The claw portion 112 holds the outer peripheral portion of the lens portion 72.
A through hole 108 is formed in the bottom surface 106a of the second notch 106, and an ejector pin 110 is inserted into the through hole 108. The ejector pin 110 is an ejector device (not shown). Is projected upward.

The fixed-side mold 104 has a first notch 120 having a circular shape in plan view with the center (not shown) of the fixed-side mold 104 as the center on the surface 104a. A first opening 104b is formed at the center of the first notch 120 (the center of the fixed mold 104). A first lens holding member 38 is provided in the first opening 104b. The first notch 120 communicates with the first opening 104b.
A claw portion (second holding tool) 122 protrudes from the first notch 120 at the edge of the bottom surface 120a of the first notch 120 that contacts the first opening 104b. The center of the mold 104 is formed at a position different from the position where the claw portion 112 of the movable mold 102 is formed at equal intervals (120 ° intervals).
Note that the lens portions can be held with high holding accuracy by arranging the claw portions 112 and 122 at equal intervals.

In the lens molding die 100 of this embodiment, when the movable side die 102 and the fixed side die 104 are closed, a cavity C is formed by the first notch 120 and the second notch 106. . This cavity C is for forming the lens frame 76.
In addition, a runner 124 that reaches the bottom surface 120 a of the first cutout 120 is formed in the fixed-side mold 104. The molten resin is supplied to the cavity C through the runner 124.

  In the present embodiment, the lens surface of the lens portion 72 is held by the first lens holding member 38 and the second lens holding member 66, and the claw portion 112 of the movable mold 102 and the fixed mold 104 is used. , 122 is the same as the lens molding die 10 of the first embodiment except that the outer peripheral portion of the lens portion 72 is held. For this reason, also in this embodiment, the same effect as a 1st embodiment can be acquired.

In the present embodiment, since the first lens holding member 38 and the second lens holding member 66 are used to hold the lens portion 72, the lens portion 72 is held with higher accuracy than in the first embodiment. Therefore, the molding accuracy of the lens frame with respect to the optical axis of the lens 70 can be further increased. For this reason, it is possible to manufacture the lens 70 having further excellent quality.
Furthermore, in the present embodiment, the lens surface of the lens portion 72 is held by the first lens holding member 38 and the second lens holding member 66, and the outer peripheral portion of the lens portion is held by the claw portions 112 and 122. Unlike the conventional bell clamp system that holds the lens surface of the lens unit, the influence of the curvature of the lens surface can be reduced when holding the lens unit.

  Also in the lens manufacturing method using the lens molding die 100 of the present embodiment, the lens manufacturing method of the first embodiment is different from the method of holding the outer peripheral portion of the lens portion 72. Other than that, The manufacturing method is the same, and as described above, the same effects as those of the first embodiment can be obtained.

In the lens manufacturing method of the present embodiment, the lens portion 72 is provided between the first lens holding member 38 and the second lens holding member 66, and then the movable side mold 102 and the fixed side mold 104 are provided. When closed, the cavity C is formed by the second notch 106 and the recess 120.
At this time, the lens portion 72 is held by the first lens holding member 38 and the second lens holding member 66, and the lens portion 72 is held by the claw portion 112 and the claw portion 122.

Next, molten resin is supplied to the cavity C through the runner 124. As a result, a lens frame (not shown) is formed around the lens portion 72 to obtain a lens.
In the present embodiment, since the claw portions 112 and 122 are not retracted, the claw portions 112 and 122 form a recess in the lens frame. However, the function of the lens frame has sufficient performance, and the lens frame is formed with higher molding accuracy than the first embodiment.

Further, in the present embodiment, the formation positions of the claw portions 112 and 122 are not particularly limited, and the claw portions 112 and 122 are formed in the movable side mold 132 and the fixed side mold 134. It is preferable to provide it at a position not present. Thereby, the lens part 72 can be held with higher holding accuracy.
Further, the number of the claw portions 112 and 122 is not particularly limited, and it is preferable to provide at least three claw portions at equal intervals.

  In the present embodiment, the claw portion 112 formed on the movable mold 102 and the claw portion 122 formed on the fixed mold 104 are both integrally formed. The invention is not limited to being integrally formed. The claw portion 112 may be formed separately from the movable mold 102, and the claw portion 122 may be formed separately from the movable mold 102.

Next, a third embodiment of the present invention will be described.
FIG. 9 is a schematic partial cross-sectional view showing a main part of a lens molding die according to the third embodiment of the present invention.
In this embodiment, the same components as those of the lens molding die 10 of the first embodiment shown in FIGS. 1 and 3 to 7A and 7B are denoted by the same reference numerals. Detailed description is omitted.

The lens molding die 130 of the present embodiment has a movable side die (second die) 132 and a fixed side die as compared with the lens molding die 10 (see FIG. 1) of the first embodiment. The configuration of the mold (first mold) 134 is different, the clamping method of the lens unit 72 is different, and the other configurations are the same as the configuration of the lens molding die 10 of the first embodiment, and the details thereof The detailed explanation is omitted.
Further, in the lens molding die 130 of the present embodiment, the fixed-side die 134 is integrally formed with the first shape member 30 (see FIG. 1) and the first clamp member 24 (see FIG. 1). Is. Further, the movable mold 132 is formed by integrally forming the second shape member 56 (see FIG. 1) and the second clamp member 52 (see FIG. 1).

The movable side mold 132 has a second opening 132b formed in a cylindrical shape on the surface 132a thereof with the center (not shown) of the movable side mold 132 as the center. A second lens holding member 140 is provided in the second opening 132b.
Further, the movable side mold 132 is formed with a second notch 136 communicating with the second opening 132b with a certain width on the surface 132a.

  The second lens holding member 140 of the present embodiment has a larger outer diameter than that of the second lens holding member 66 (see FIG. 1) of the first embodiment, and constitutes a part of the cavity C. In addition to the holding part 140a for holding the lens part 72, a through hole 140b provided with a pin (first holding tool) 142 for supporting the lens part 72 is formed outside the holding part 140a. Since the other configuration is the same as that of the second lens holding member 66 (see FIG. 1) of the first embodiment, detailed description thereof is omitted.

Further, for example, three through holes 140b of the second lens holding member 140 are formed at equal intervals (120 ° intervals) with the center of the movable side mold 132 as the center. Each through-hole 140b is provided with a pin 142 so as to protrude into the second notch 136.
Although not shown, a through hole is formed in the bottom surface 136a of the second notch 136, and an ejector pin (not shown) is inserted through the through hole. This ejector pin is protruded upward by an ejector device (not shown).

Further, the fixed-side mold 134 has a first opening 134b formed in a cylindrical shape on the surface 134a with the center (not shown) of the fixed-side mold 134 as the center. A first lens holding member 150 is provided in the first opening 134b.
In addition, the fixed side mold 134 is formed with a first notch 144 having a constant width and communicating with the inner peripheral surface of the first opening 134b on the surface 134a.

  The first lens holding member 150 of the present embodiment has a larger outer diameter than that of the first lens holding member 38 (see FIG. 1) of the first embodiment and constitutes a part of the cavity C. In addition to the holding part 150a for holding the lens part 72, a through hole 150b provided with a pin (second holding tool) 142 for supporting the lens part 72 is formed outside the holding part 150a. Since the other configuration is the same as that of the first lens holding member 38 (see FIG. 1) of the first embodiment, the detailed description thereof is omitted.

  The three through holes 150b of the first lens holding member 150 are, for example, three pins 142 at regular intervals (120 ° intervals) around the center of the fixed mold 134 and the pins 142 of the movable mold 132. It is formed at a position different from the arrangement position. Each through-hole 150b is provided with a pin 142 so as to protrude into the first cutout 144.

In the present embodiment, the pin 142 has a cross-sectional shape at the tip thereof that is similar to the cross-sectional shape of the tip 39 of the first lens holding member 38 (see FIG. 7A). The tip of the pin 142 is in contact with the outer peripheral surface of the lens portion 72, and the outer peripheral surface of the lens portion is held.
In the present embodiment, the lens portion 72 can be held with high holding accuracy by providing the pins 142 at equal intervals on the movable die 132 and the fixed die 134, respectively.

In the lens molding die 130 of this embodiment, when the movable die 132 and the fixed die 134 are closed, the cavity C is formed by the second notch 136 and the first notch 144. . This cavity C becomes a lens frame (not shown).
In addition, a runner 146 reaching the bottom surface 144a of the first cutout 144 is formed in the fixed side mold 134. The molten resin is supplied to the cavity C through the runner 146.

  In the present embodiment, the lens surface of the lens portion 72 is held by the first lens holding member 150 and the second lens holding member 140, and the pins 142 of the movable mold 132 and the fixed mold 134 are fixed. Except that the outer peripheral portion of the lens portion 72 is held by the pin 142, the configuration is the same as that of the lens molding die of the first embodiment. For this reason, also in this embodiment, the same effect as a 1st embodiment can be acquired.

In the present embodiment, since the first lens holding member 150 and the second lens holding member 140 are used for holding the lens unit 72, the lens unit 72 is held with higher accuracy than the first embodiment. And the molding accuracy of the lens frame with respect to the optical axis of the lens 70 can be further increased. For this reason, it is possible to manufacture the lens 70 having further excellent quality.
Furthermore, in this embodiment, the lens surface of the lens portion 72 is held by the first lens holding member 150 and the second lens holding member 140 and the outer peripheral portion of the lens portion is held by the claw portion 142. Unlike the conventional bell clamp system that holds the lens surface, it is possible to reduce the influence of the curvature of the lens surface when holding the lens portion.

  Also in the lens manufacturing method using the lens molding die 130 of the present embodiment, the lens manufacturing method of the first embodiment is different from the method of holding the outer peripheral portion of the lens portion 72. Other than that, The manufacturing method is the same, and as described above, the same effects as those of the first embodiment can be obtained.

In the lens manufacturing method of the present embodiment, the lens portion 72 is provided between the first lens holding member 150 and the second lens holding member 150, and then the movable side mold 132 and the fixed side mold 134 are provided. When closed, the cavity C is formed by the second notch 136 and the first notch 144.
At this time, the lens unit 72 is held by the first lens holding member 150 and the second lens holding member 140, and the lens unit 72 is held by the pin 142.

Next, the molten resin is supplied to the cavity C through the runner 146. As a result, a lens frame (not shown) is formed around the lens portion 72 to obtain a lens.
In the present embodiment, since the pin 142 is not retracted, the pin 142 forms a recess in the lens frame. However, the function of the lens frame has sufficient performance, and the lens frame is formed with higher molding accuracy than the first embodiment.

In the present embodiment, the position where the pin 142 is formed is not particularly limited. In the movable mold 132 and the fixed mold 134, the pin 142 is located at a position where the pins 142 are not formed with each other. It is preferable to provide it. Thereby, the lens part 72 can be held with higher holding accuracy.
Further, the number of pins 142 in each of the movable side mold 132 and the fixed side mold 134 is not particularly limited, and it is preferable to provide at least three pins at regular intervals.
Also in this embodiment, the pins 142 provided on each of the movable side mold 132 and the fixed side mold 134 are all formed separately, but the present invention is not limited to this. . In the present invention, the pin 142 may be integrally formed.

  The lens molding die and the lens manufacturing method of the present invention have been described above. However, the present invention is not limited to the above-described embodiment, and various improvements or modifications are made without departing from the gist of the present invention. Of course, you may.

1 is a schematic cross-sectional view showing a lens molding die according to a first embodiment of the present invention. (A) is a typical perspective view which shows the lens produced with the metal mold | die for lens shaping | molding which concerns on the 1st Embodiment of this invention, (b) is the lens which concerns on the 1st Embodiment of this invention. It is typical sectional drawing which shows the lens produced with the metal mold | die for shaping | molding. It is typical sectional drawing which shows the process of the manufacturing method of the lens using the lens shaping die concerning the 1st Embodiment of this invention. FIG. 4 is a schematic cross-sectional view showing the next step of FIG. 3. FIG. 5 is a schematic cross-sectional view showing a step subsequent to FIG. 4. FIG. 6 is a schematic cross-sectional view showing the next step of FIG. 5. (A) is typical sectional drawing which expands and shows the principal part, in order to demonstrate the mold closing process of the manufacturing method of the lens using the lens shaping die of this embodiment, (b) is this FIG. 5 is a schematic cross-sectional view showing an enlarged main part in order to explain a lens frame forming step of a lens manufacturing method using the lens forming mold of the embodiment. It is a typical perspective view which shows the principal part of the lens shaping die concerning the 2nd Embodiment of this invention, and shows a part notched. It is a typical fragmentary sectional view which shows the principal part of the metal mold | die for lens shaping | molding which concerns on the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lens molding die 12 1st mounting plate 12c Sprue 12d Runner 12e Inlet 14 Fixed side die 16 Movable side die 18 Fixed side plate 22 Fixed contact plate 24 First clamp member 30 First mold member 34 First 1 return spring 36 1st guide pin 38 1st lens holding member 42 2nd mounting plate 46 Movable side plate 50 2nd clamp member 56 2nd type | mold member 60 2nd return spring 62 2nd guide pin 64 Ejector pin 66 Second lens holding member 68 Lens housing portion 70 Lens 72 Lens portion 72a Outer peripheral portion 76 Lens frame 80 Molten resin 82 Runner member

Claims (9)

A lens molding die for a lens having a lens part having a corner on the outer peripheral part and an annular lens frame formed on the outer peripheral part,
A first mold and a second mold which are arranged opposite to each other and can be opened and closed;
The first mold includes a first clamp member including a base portion having an opening formed at the center and a flange portion, and a holding portion that is disposed in the opening and holds the lens surface of the lens portion. 1 lens holding member, and a first mold member including a bent portion that covers the flange portion of the first clamp member,
The second mold includes a base portion and a flange portion having an opening formed at the center, a second clamp member that is paired with the first clamp member, and the second mold, and is disposed in the opening portion. A second lens holding member that forms a pair with the first lens holding member, and a bent portion that covers the flange portion of the second clamp member. A second mold member paired with one mold member;
In the pair of first clamp member and second clamp member, the lens portion is disposed between the openings, and the outer periphery of the lens portion is held with a predetermined holding accuracy by sandwiching the lens portion. The pair of the first lens holding member and the second lens holding member hold the lens surface of the lens portion with a predetermined holding accuracy, and the pair of the first lens holding member and the second lens holding member. The first mold member and the second mold member are configured such that, when the first mold and the second mold are closed, the bent portions come into contact with each other to form a parting line. And
When the first mold and the second mold are closed, the outer periphery of the lens unit is held by the first clamp member and the second clamp member, and then the first lens holding The lens surface is held by the member and the second lens holding member, and the holding of the lens part is released by separating the first clamp member and the second clamp part from each other by a predetermined distance. 1 lens holding member and the second lens holding member, the first clamp member and the second clamp member, and the bent portions of the first mold member and the second mold member, A lens molding die, wherein an annular cavity for molding a lens frame is formed.   2. The lens molding gold according to claim 1, wherein each of the first clamp member and the second clamp member has an inclined surface formed on an end surface of each opening, and the outer peripheral portion of the lens unit is held by the inclined surface. Type. A lens molding die for a lens having a lens part having a corner on the outer peripheral part and an annular lens frame formed on the outer peripheral part,
A first mold and a second mold which are arranged opposite to each other and can be opened and closed;
The first mold has a first opening formed at the center of the surface thereof, a first notch communicating with the first opening on the surface, and the first mold. A first lens holding member that is disposed in one opening and includes a holding portion that holds the lens surface of the lens portion; and a first lens holding member that protrudes from the first cutout portion and holds an outer peripheral portion of the lens portion. A first mold member having one holding tool,
The second mold has a second opening formed at the center of the surface thereof, and a second notch that constitutes a cavity for forming the lens frame together with the first notch. The first lens holding member includes a holding portion that is formed on the surface so as to communicate with the second opening, and is further provided in the second opening and holds the lens surface of the lens portion. A second mold member comprising a pair of second lens holding members and a second holding tool that protrudes from the second notch and holds the outer periphery of the lens part;
The pair of the first lens holding member and the second lens holding member sandwich the lens surface of the lens portion and hold it with a predetermined holding accuracy.
When the first mold and the second mold are closed, the lens surface is held by the first lens holding member and the second lens holding member, and the first holding tool A lens molding die, wherein an outer peripheral portion of the lens portion is held by the second holder, and the cavity is formed by the first cutout portion and the second cutout portion.   The lens molding die according to claim 3, wherein at least three of the first holder and the second holder are provided at equal intervals.   The lens molding die according to claim 3 or 4, wherein the first holder and the second holder are provided at different positions.   The first holding tool and the second holding tool are configured such that an inclined surface is formed at a tip portion in contact with an outer peripheral portion of the lens portion, and the outer peripheral portion of the lens portion is held by the inclined surface. The lens molding die according to any one of 5. A lens manufacturing method for manufacturing a lens having a lens part having a corner on an outer peripheral part and an annular lens frame formed on the outer peripheral part by molding the lens frame on the outer peripheral part of the lens part. There,
Holding the outer peripheral portion of the lens portion with a predetermined holding accuracy;
Holding the lens surface of the lens unit, and releasing the holding of the outer periphery of the lens unit;
Forming an annular cavity for molding the lens frame while holding the lens surface of the lens unit;
And a step of filling the cavity with a molten resin. A lens having a lens portion having a corner on the outer peripheral portion and an annular lens frame formed on the outer peripheral portion, and a pair of first mold and second lens on the outer peripheral portion of the lens portion. A method of manufacturing a lens that is molded using a mold of
The pair of first molds and the second mold are movable in an opening and closing direction, and a pair of first molds that hold the outer periphery of the lens unit with a predetermined holding accuracy by sandwiching the lens unit. A clamp member, a second clamp member, a pair of first lens holding member and second lens holding member that hold the lens surface of the lens portion with a predetermined holding accuracy, and the first mold When the second mold is closed, it has a pair of first mold member and second mold member that form a parting line,
The lens unit is disposed between the first mold and the second mold, and the outer periphery of the lens unit is held with a predetermined holding accuracy by the first clamp member and the second clamp member. Holding, and
The lens surface of the lens unit is held by the first lens holding member and the second lens holding member, and the first clamp member and the second clamp member are separated from each other by a predetermined distance. Releasing the holding of the outer periphery,
The first lens holding member, the second lens holding member, the first clamp member, the second clamp member, and the first mold member in a state where the lens surface of the lens portion is held. And a step of forming an annular cavity for forming the lens frame by each bent portion of the second mold member,
And a step of filling the cavity with a molten resin. A lens having a lens portion having a corner on the outer peripheral portion and an annular lens frame formed on the outer peripheral portion, and a pair of first mold and second lens on the outer peripheral portion of the lens portion. A method of manufacturing a lens that is molded using a mold of
The pair of first molds and the second mold are movable in an opening and closing direction, and a pair of first lens holding members and a first lens holding member for holding the lens surface of the lens unit with a predetermined holding accuracy. When the second lens holding member, the first holding tool and the second holding tool that hold the outer periphery of the lens portion, and the first mold and the second mold are closed, A first notch and a second notch that form a cavity for forming a lens frame;
The lens unit is disposed between the first mold and the second mold, the first mold and the second mold are closed, and the first lens holding member and the second mold are closed. The lens surface of the lens portion is held by the second lens holding member, and the outer peripheral portion of the lens portion is held by the first holder and the second holder, and the first notch portion and the first notch portion A step in which a cavity is formed by two notches,
And a step of filling the cavity with a molten resin.

Images