JP2017015818A - Method and apparatus for molding optical member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for molding an optical member which enables the use of a small-sized molding device and can reduce a production cost.SOLUTION: A method for injecting a resin to a cavity C defined by a pair of clamped metal molds to mold an optical member includes dividing the cavity C in a clamping direction with a core 40 arranged between molding surfaces 22 and 32 of metal molds 20 and 30, and molding optical members 2A and 2B with each of the divided cavities C1 and C2. The production cost can be reduced by use of a small-sized molding device.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a molding method and apparatus for molding an optical member for forming a light distribution such as a projection convex lens.

  A projection headlamp for an automobile has a structure in which light source light is projected and distributed forward by a projection convex lens. In recent years, a light resin lens tends to be employed by using an LED as a light source. .

  As a projection convex lens, a relatively thick convex lens is generally used. However, in order to perform further light weight and fine light distribution control, a plurality of lenses having different shapes are combined as shown in Patent Document 1 below. Projection convex lenses have been proposed.

JP2014-26741 (paragraphs 0042, 0043, 0056, FIGS. 1, 2, 5, 8)

  In order to mold a resin-made projection convex lens, it is molded by a mold having a cavity corresponding to the lens shape. However, since one lens is generally molded by one mold, the production efficiency is poor. In particular, as shown in Patent Document 1, a plurality of lenses having different shapes are molded by a plurality of molds each having a cavity having a different shape, and thus production costs are also required.

  In addition, there are also known methods such as so-called parent-and-child removal and multiple-cavity, in which cavities are arranged in parallel along the dividing surface of the mold and a plurality of lenses are molded simultaneously with a single mold. Although it increases, as the mold becomes larger, the molding equipment becomes larger, which does not lead to a reduction in production costs.

  The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to use a small molding apparatus when molding a plurality of optical members using a single molding apparatus. An object of the present invention is to provide an optical member molding method and apparatus capable of reducing production costs.

In order to solve the above-mentioned problem, the invention according to claim 1 is an optical member molding method in which a resin is injected and molded into a cavity defined by a pair of molds closed.
The cavities are divided in the mold closing direction by cores disposed between the opposing molding surfaces of the mold, and resin is injected into the divided cavities for molding.

According to a third aspect of the present invention, there is provided a cavity defined by the pair of molds, each of which includes a fixed mold and a movable mold that can move in a direction approaching and separating from the fixed mold. In an optical member molding apparatus for injecting and molding resin
A core is provided between the opposing molding surfaces of the mold and divides the cavity in the mold closing direction of the mold.

(Operation of Invention of Claim 1 or Invention of Claim 3)
Since a plurality of optical members are molded with one mold, production efficiency is good. In particular, since the cavities are arranged side by side in the mold closing direction of the mold, a small molding apparatus can be used, which leads to a reduction in production cost.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, injection molding is performed in a form in which the dividing surface of the mold sandwiches at least a part of the peripheral edge of the core.

  According to a fourth aspect of the present invention, in the invention of the third aspect, the core is configured such that at least a part of a peripheral portion thereof is sandwiched between the mold dividing surfaces that are clamped. Features.

(Effects of Invention of Claim 2 or Invention of Claim 4)
The core that is disposed between the opposing molding surfaces of the mold and extends into the cavity vibrates, bends, or deforms due to the pressure of the resin that is injected and filled into the divided cavities. There is a risk that sink marks or shape defects may occur in the (optical member). However, in the invention of claim 2 or claim 4, at least a part of the peripheral portion of the core in the injection molding is sandwiched between the split surfaces of the mold (a sandwiching portion thereof), so that the cavity is separated. Because it is fixed and held at a predetermined position to be divided, vibration, bending and deformation are suppressed, and it has a surface shape that follows the molding surface of the mold and the molding surface of the core, and a plurality of resins having a predetermined shape without sink marks or shape defects A molded body (optical member) is molded.

  As is apparent from the above description, according to the method and apparatus for molding an optical member according to the present invention, a plurality of optical members can be molded by one small molding apparatus, so that the production cost of the optical member can be reduced.

It is sectional drawing which shows the outline | summary of the shaping | molding apparatus of the projection convex lens which is the 1st Example of this invention. It is a perspective view of a core. It is a front view (figure directly opposite to a molding surface) of a movable mold. It is a front view (figure which faces a molding surface) of a fixed side metal mold | die. 3A is a longitudinal sectional view of the main part of the mold, FIG. 3A is a longitudinal sectional view of the main part of the mold along the line AA in FIG. 3, and FIG. It is a longitudinal cross-sectional view. It is a principal part enlarged front view of a movable side metal mold | die. It is an expansion perspective view of the side gate formation groove | channel provided in the division surface of a movable side metal mold | die. FIG. 5 is an enlarged vertical cross-sectional view of a main part of the mold at the position of the core protrusion pin (a detailed view enlarging the view shown in FIG. 5A and a cross-sectional view of the mold taken along line VIII-VIII shown in FIG. 6). is there. FIG. 7 is an enlarged vertical cross-sectional view of the main part of the mold at the position of the molded product ejection pin (cross-sectional view of the mold along line IX-IX shown in FIG. 6). It is a principal part longitudinal cross-sectional view of the metal mold | die of the state with which the division | segmentation cavity was filled with resin. It is a principal part longitudinal cross-sectional view of the metal mold | die which shows a mold opening process. It is a principal part longitudinal cross-sectional view of the metal mold | die which shows a core taking-out process. It is a longitudinal cross-sectional view of the convex lens taken out from the metal mold | die. It is a principal part longitudinal cross-sectional view of the projection convex lens unit which integrated two convex lenses. It is a principal part longitudinal cross-sectional view of the metal mold | die of the shaping | molding apparatus of the projection convex lens which is 2nd Example of this invention, (a) is a figure corresponding to Fig.5 (a), (b) is FIG.5 (b). It is a corresponding figure.

  FIGS. 1-12 shows the 1st Example which applied the shaping | molding method and apparatus of the optical member based on this invention to the shaping | molding method and apparatus of a projection convex lens.

  In FIG. 1, a molding apparatus 10 that molds a projection convex lens mainly includes a fixed mold 20 having a molding surface 22 and a molding surface 32 that faces the molding surface 22, and approaches and separates from the fixed mold 20. The movable mold 30 that can move in the direction (left and right in FIG. 1), the mold closing / opening mechanism 70 that moves the movable mold 30, and the molding surfaces 22 of the molds 20 and 30 that are closed. 32, a removable core 40 that divides the cavity C defined by the molding surfaces 22, 32 into two in the mold closing direction (see FIGS. 2, 5 (a), (b)). And injection for supplying resin to the divided cavities divided by the core 40, that is, the cavities C1 and C2 (see FIGS. 5A and 5B) defined by the molding surfaces 22 and 32 and the core 40. Machine 60. Note that the mold closing / opening mechanism 70 for moving the movable mold 30 is a known drive mechanism such as a hydraulic cylinder mechanism or a toggle mechanism.

  As shown in FIGS. 3, 4, and 5, two runners 24 and 34 that extend radially outward from the cavity C are provided on the split surfaces 21 and 31 of the molds 20 and 30 that are closed. Yes. The runners 24 and 34 are passages for supplying resin to the divided cavities C1 and C2 divided by the core 40, and communicate with the divided cavities C1 and C2 through the side gates 25 and 35.

  As shown in FIGS. 1 and 4, a hot runner 26 communicating with the runners 24 and 34 via the valve gate 27 is arranged in parallel on the fixed mold 20, and each hot runner 26 has a convex lens. A material (transparent resin) for molding 2A and 2B (see FIG. 13) is supplied from the injection machine 60 in a molten state.

  Hereinafter, the structures of the molds 20 and 30 and the core 40 will be described in detail with reference to FIGS.

  As shown in FIGS. 4 and 5, the split surface 21 of the fixed-side mold 20 is provided with a molding surface 22 constituted by a concave concave plane 22 a that is slightly recessed with respect to the split surface 21. As shown in FIGS. 3 and 5, the dividing surface 31 of the movable mold 30 is provided with a molding surface 32 that defines the cavity C (see FIG. 1) in cooperation with the molding surface 22. The molding surface 32 is formed in such a size that the core 40 can be engaged with it. The concave spherical surface 32a having a circular shape when viewed from the front, which is largely recessed with respect to the division surface 31, and the divided peripheral surface formed on the opening side peripheral portion of the concave spherical surface 32a. It is composed of an annular stepped concave flat surface 32 b that is slightly recessed with respect to the surface 31. As shown in FIGS. 6 to 9, the stepped concave flat surface 32 b includes an annular first concave flat surface 32 b 1 close to the concave spherical surface 32 a and an annular second flat surface formed outside the stepped portion 32 b 3. It is composed of a concave flat surface 32b2. A step portion 32b3 between the first and second concave mold planes 31b1 and 32b2 coincides with the outer diameter (inner diameter) of the molding surface 22 (concave mold plane 22a) on the fixed mold 20 side, and the second concave mold plane 32b2 The depth (distance from the dividing surface 31) corresponds to the thickness of a flange portion 41b (see FIG. 2) of the core 40 described later.

  That is, the second concave flat surface 32b2 provided near the periphery of the molding surface 32 of the movable die 30 cooperates with the dividing surface 21 of the fixed die 20 to sandwich the flange portion 41b of the core 40. The clamping part which comprises is comprised.

  Further, as shown in FIGS. 3, 5 (a), 6, and 7, first and second side gate forming grooves are formed on the dividing surface 31 of the movable mold 30 from the circular molding surface 32 as viewed from the front. As shown in FIGS. 4 and 5B, a runner forming groove 34a having an arcuate cross section extending radially outward via 35a and 35b is provided, and the dividing surface 21 of the fixed mold 20 is also a front surface as shown in FIGS. A runner forming groove 24a having an arcuate cross section is provided extending outward in the radial direction from the molding surface 22 having a circular shape, via the side gate forming groove 25a.

  Then, by assembling the core 40 so as to engage with the opening side of the molding surface 32 and closing the molds 20 and 30, as shown in FIGS. A runner 34 is formed, and the runner 24 is formed by the runner formation groove 24 a and the dividing surface 31.

  The runner 24 formed between the split surfaces 21 and 31 of the molds 20 and 30 communicates with the split cavity C1 via the side gate forming groove 25a and the side gate 25 defined by the split surface 31. Therefore, at the time of injection molding performed in a form in which the cavity C is divided by the core 40, the resin guided to the runner 24 through the valve gate 27 is injected into the divided cavity C1 through the side gate 25.

  On the other hand, as shown in FIGS. 3, 5 (a), 6, 7, and 8, the dividing surface 31 of the movable die 30 cooperates with the first side gate formation groove 35 a to form a runner formation groove 34 a. A second side gate forming groove 35b extending in an L-shaped longitudinal section is formed to communicate with the split cavity C2. Accordingly, the resin guided to the runner 34 via the valve gate 27 during the injection molding performed in the form in which the cavity C is divided by the core 40 is connected to the first and second side gate forming grooves 35a, It is injected into the split cavity C2 through the side gate 35 constituted by 35b.

  Moreover, the core 40 is comprised with the core main body 41 of the disk shape of a front view as shown in FIG. 2, and is the same material (metal excellent in heat conductivity) as the material which comprises the metal mold | dies 20 and 30. It is configured.

  The core body 41 has a structure in which an annular flange portion 41b having a flat predetermined width is integrally formed on the outer periphery of a central region 41a having an arc-shaped longitudinal section smaller in curvature than the curvature of the concave spherical surface 32a of the molding surface 32. 5 and 8, the molding surfaces of the molds 20 and 30 are formed to have a size (outer diameter) that can be engaged with the opening side of the molding surface 32 of the movable mold 30, that is, the molds are closed. It is formed in a size that can be engaged with the cavity C defined by 22 and 32, and can be divided into two at approximately equal intervals in the mold closing direction.

  On the concave surface side of the core body 41, as shown in FIGS. 2, 5, and 8, a concave spherical molding surface 41a1 is formed which cooperates with the molding surface 22 of the mold 20 to define the divided cavity C1. On the convex surface side of the core body 41, a convex spherical molding surface 41a2 is formed which defines the split cavity C2 in cooperation with the molding surface 32 of the mold 30.

  In this embodiment, the core 40 disposed between the opposing molding surfaces 22 and 32 of the molds 20 and 30 is sandwiched between the split surfaces 21 and 31 of the molds 20 and 30 by closing the mold. . That is, during the injection molding process, the core 40 is securely fixed and held so as not to vibrate or deform (see FIG. 8).

  Specifically, when the core 40 is assembled to the molding surface 32 of the mold 30 and the molds 20 and 30 are closed, a region 41b ′ having a predetermined width near the peripheral edge of the flange portion 41b of the core 40 (FIGS. 8 and 9). Reference) The entire position is sandwiched between the second concave flat surface 32b2 near the periphery of the molding surface 32 of the mold 30 and the dividing surface 21 of the mold 20, and the cavity C is divided into two at substantially equal intervals in the mold closing direction. Is fixedly held.

  Further, only a part of the core can be sandwiched between the split surfaces 21 and 31 of the molds 20 and 30, and the core body cantilevered into the cavity C. The core body vibrates, bends, or deforms due to the pressure of the resin injected and filled into the cavities C1 and C2, and there is a risk that sinks and shape defects may occur in the convex lenses 2A and 2B that are resin molded bodies. .

  However, in this embodiment, the core body 41 in the injection molding has a second concave flat surface in which the entire peripheral portion of the flange portion 41b formed on the outer periphery thereof is close to the peripheral portion of the molding surface 32 of the mold 30. By being sandwiched between the split surfaces 21b2 and the mold 20, the vibration, deflection and deformation of the core 40 are surely suppressed. As a result, the convex lenses 2A and 2B, which are resin moldings having a predetermined shape and having a shape that follows the molding surfaces 41a1 and 22; 32 and 41a2 that define the divided cavities C1 and C2, are formed. (See FIGS. 8, 10, and 11).

  In particular, since the divided cavities C1 and C2 are defined by the molds 20 and 30 and the core 40 having excellent thermal conductivity, the holding pressure until the resin filled in the divided cavities C1 and C2 is cooled and solidified. The time is only slightly longer than the conventional molding method in which the cavities are arranged side by side on the dividing surface of the mold.

  Further, as shown in FIGS. 6 and 8, a core protruding pin 50 capable of protruding into the cavity C is provided on the annular second concave flat surface 32b2 near the outer periphery of the molding surface 32 of the movable mold 30. It is provided at eight locations equally in the direction. Further, as shown in FIGS. 6 and 9, the annular first concave flat surface 32b1 inside the second concave flat surface 32b2 of the movable side mold 30 can project into the cavity C (divided cavity C2). Product extruding pins 52 are provided at eight locations equally in the circumferential direction. On the other hand, in the vicinity of the outer periphery of the molding surface 22 of the fixed mold 20, there are eight equally divided portions in the cavity C (divided cavity C 1) in the circumferential direction corresponding to the position of the product ejection pin 52 on the movable mold 30. A product ejecting pin 53 capable of projecting is provided.

  Further, when the molds 20 and 30 are opened after the convex lenses 2A and 2B are formed by the divided cavities C1 and C2, the molds 20 and 30 are separated from the divided surfaces 21 and 31, as shown in FIG. However, in the fixed side mold 20, since there is a step portion between the dividing surface 21 and the molding surface 22 (concave surface 22a), and further, the runner forming groove 24a is formed in the dividing surface 21, the convex lens 2A is The shape is held in close contact with the molding surface 22.

  In addition, on the surface of the core 40 (core body 41), in order to make the core body 41 easy to peel off from the convex lenses 2A and 2B, a known surface treatment (for example, a fluoride material layer) that improves the releasability with respect to the resin. , Formation of ceramic layers, metal compound layers, etc.). For this reason, when the mold is opened, the convex lens 2 </ b> A is securely held in a form in close contact with the molding surface 22 of the fixed mold 20. On the other hand, in the movable mold 30, the convex lens 2B is held in a form in close contact with the molding surface 32, and the core body 41 is also held in a form in close contact with the convex lens 2B.

  As described above, the convex lens 2B and the core body 41 are laminated on the molding surface 32 of the movable mold 30 that has been opened. However, as shown by the arrows in FIG. By pushing and pressing the flange portion 41b of the main body 41, the core main body 41 is smoothly separated from the convex lens 2B, and the entire core 40 is separated from the convex lens 2B closely contacting the molding surface 32. (See FIG. 12).

  Further, after the core 40 is taken out from the mold 30, the molded product ejecting pins 52 and 53 are driven to push the convex lenses 2A and 2B, thereby releasing the convex lenses 2A and 2B from the molds 20 and 30. Can be made.

  Next, a process of molding the convex lenses 2A and 2B using the molding apparatus 10 will be described with reference to FIGS.

  First, after assembling the core 40 on the opening side of the molding surface 32 in the split surface 31 of the movable mold 30 that is open relative to the fixed mold 20, the movable mold 30 is moved closer to the fixed mold 20. In this way, the divided cavities C1 and C2 are formed by closing the mold (see FIGS. 5A and 5B).

  Next, as shown in FIG. 10, the convex lenses 2A and 2B are molded by injecting molten resin into the divided cavities C1 and C2 simultaneously and holding the pressure for a predetermined time.

  Next, as shown in FIG. 11, after performing a mold opening process in which the movable mold 30 is moved away from the fixed mold 20, the core ejection pin 50 (see FIGS. 6 and 8) is driven. Then, as shown in FIG. 12, the core 40 is taken out from the mold 30.

  Further, the molded product ejection pins 52 and 53 (see FIGS. 7 and 9) are driven to take out the convex lenses 2A and 2B from the molds 20 and 30, respectively.

  FIG. 13 shows the convex lenses 2 </ b> A and 2 </ b> B taken out from the molds 20 and 30.

  The convex lenses 2A and 2B have a structure in which flange portions 2a2 and 2b2 are formed on the peripheral edges of the central convex lens bodies 2a1 and 2b1, respectively. The outer periphery of the flange portions 2a2 and 2b2 is cooled and solidified in runners 24 and 34. Since the rod-shaped resin molded bodies 3 and 4 extend outward in the radial direction, if these unnecessary resin molded bodies 3 and 4 are cut and removed at predetermined positions in the subsequent process, predetermined convex lenses 2A and 2B are obtained. Is completed.

  As is clear from the above description, the molding apparatus 10 of this embodiment is arranged between a pair of molds 20 and 30 that can be closed and opened and the molding surfaces 22 and 32 facing each other. It is configured by a removable core 40 that is provided and divides the cavity C in two in the mold closing direction of the molds 20 and 30. The structure is simple and compact.

  Therefore, in the molding method and apparatus of this embodiment, two convex lenses 2A and 2B can be molded at the same time by using a small molding facility, so that the production cost of the convex lens can be greatly reduced.

  FIG. 14 is a longitudinal sectional view of a main part of a projection convex lens unit using convex lenses 2A and 2B molded by the molding apparatus 10 of the first embodiment.

  The two convex lenses 2A and 2B accommodated in the lens barrel 6 are arranged so as to be separated from each other by a predetermined distance in the optical axis direction of the lens via an annular spacer member 7, thereby forming a projection convex lens unit U. ing. Reference numeral 8 denotes an annular fastener screwed to the outer periphery of the front end portion of the lens barrel 6. The convex lenses 2A and 2B are spacer members 7 having flange portions 2a2 and 2b2 formed on the outer periphery thereof. Is sandwiched between an annular step portion 6 a provided on the inner periphery of the lens barrel 6 and an annular fastener 8 having an L-shaped cross section, thereby being integrated with the lens barrel 6.

  The projection convex lens unit U is, for example, arranged at a predetermined position in front of a light source unit (not shown) in which a plurality of LEDs are arranged at equal intervals in the left-right direction, and is integrated as a lamp unit. Then, the lamp unit is arranged in the lamp chamber (not shown) of the automotive headlamp defined by the lamp body and the front cover, so that the light emission of the light source unit is configured by the convex lenses 2A and 2B. Light is projected and distributed in front of the front cover via the projection convex lens unit U, so that the light distribution of the headlamp is formed.

  The projection convex lens unit U composed of the two convex lenses 2A and 2B is lighter in weight and has a larger refractive index than the single thick projection convex lens, and the width of the spacer member 7 (between the lenses 2A and 2B). By adjusting the distance, the light distribution can be finely controlled.

  FIG. 15 is a longitudinal sectional view of the main part of the mold of the molding apparatus 10A according to the second embodiment of the present invention, and FIG. 15A is a longitudinal sectional view of the essential part of the mold of the molding apparatus 10 of the first embodiment. The figure corresponding to Drawing 5 (a) which shows a figure, (b) is the figure corresponding to Drawing 5 (b) showing the principal part longitudinal section of the metallic mold of forming device 10 of the 1st example.

  In the first embodiment described above, two convex lenses 2A and 2B having different shapes are formed at the same time, but in this second embodiment, two convex lenses having the same shape are formed simultaneously. It is configured as follows.

  Specifically, the molding apparatus 10A includes a fixed mold 20A having a molding surface 22A, and a molding surface 32 facing the molding surface 22A, and is a movable side mold that can move in the approaching / separating direction with respect to the fixed mold 20A. A mold 30, a mold closing / opening mechanism 70 (not shown) that moves the movable mold 30, and the molding surfaces 22 A, 32 of the molds 20 A, 30 that are closed to each other, are molded. Removable core 40A that divides the cavity defined by surfaces 22A and 32 in the mold closing direction, and a split cavity that is divided by core 40A, that is, molding surfaces 22A and 32 and core 40A (medium An injection machine 60 (not shown) for supplying resin to the cavities C3 and C4 defined by the child main body 41A). The basic structure of the molding apparatus 10A is the same as that of the molding apparatus 10 of the first embodiment, but the following points are different.

  First, the movable side mold 30 has the same molding surface 32 as the movable side mold 30 constituting the molding apparatus 10 of the first embodiment. The molding surface 22A provided on the dividing surface 21A has the same shape as the molding surface 32 (32a, 32b) of the movable mold 30. Specifically, the molding surface 22A is slightly recessed with respect to the divided surface 21A formed on the opening-side peripheral portion of the concave spherical surface 22a ′ and the concave spherical surface 22a ′ having a circular shape when viewed from the front. It is composed of an annular stepped concave plane 22b. The stepped concave plane 22b includes an annular first concave plane 22b1 close to the concave spherical surface 22a ′ and an annular second concave plane 22b2 formed outside the stepped portion 22b3. . The first and second concave planes 22b1 and 22b2 constituting the stepped concave plane 22b have the same shape as the first and second concave planes 32b1 and 32b2 constituting the molding surface 32.

  Secondly, in the first embodiment described above, the core body 41 of the core 40 accommodated in the cavity C is formed in a longitudinal cross-section arc shape (see FIG. 5). The entire core body 41A including the annular flange portion at the periphery of the core 40A is formed in a planar shape having a predetermined thickness. Specifically, the core 40A (core body 41A) matches the distance between the second concave plane 32b2 of the molding surface 32 and the second concave plane 22b2 of the molding surface 22 in the clamped molds 20 and 30. It is formed to the thickness to be.

  Accordingly, the core 40A (core body 41A) is disposed between the opposing molding surfaces 22A and 32 of the molds 20A and 30 which are closed, so that the cavity defined by the molding surfaces 22A and 32 is the mold. Divided into two in the closing direction, divided cavities C3 and C4 having the same shape are defined.

  Third, as shown in FIG. 15A, the runner forming groove 34a is formed in the split cavity C3 on the split surface 31 of the movable mold 30 in cooperation with the first side gate forming groove 35a. A second side gate forming groove 35b extending in an L-shaped vertical cross section is formed to be communicated with each other. However, as shown in FIG. In cooperation with the side gate forming groove 25a, a second side gate forming groove 25b extending in an L-shaped vertical cross section is formed to communicate the runner forming groove 24a with the divided cavity C3.

  Accordingly, the resin guided to the runner 24 via the valve gate 27 (see FIG. 1) provided in the fixed mold 20A is a side gate constituted by the first and second side gate forming grooves 25a and 25b. 25 to be injected into the split cavity C3.

  Others are the same as those of the first embodiment described above, and a duplicate description thereof is omitted.

  In the first and second embodiments described above, the runner 24 is composed of runner forming grooves 24a formed on the dividing surfaces 21 and 21A of the fixed molds 20 and 20A, and the runner 34 is composed of the movable mold 30. The runner formation grooves 34a are formed on the divided surfaces 31 of the molds 20, but the runners 24, 34 may be formed as grooves on either side of the divided surfaces 21, 21A; 31 of the molds 20, 20A; Alternatively, it may be formed as a groove extending over both of the dividing surfaces 21, 21A;

C cavity
C1, C2, C3, C4 Divided cavity 2A, 2B Convex lens as optical member
2a1, 2b1 Convex lens body
2a2, 2b2 Flange U Projection convex lens unit 10, 10A Convex lens molding device 20, 20A Fixed side mold 21, 21A Fixed side mold split surface 22, 22A Fixed side mold molding surface 24, 34 Resin passage Runner 26 Hot runner 30 Movable side mold 31 Movable side mold split surface 32 Movable side mold molding surface 41, 41A Core body 50 Core ejection pins 52, 53 Molded product ejection pins 60 Mold closing / opening mechanism 70 Injection machine

Claims (4)

In a molding method of an optical member in which a resin is injected and molded into a cavity defined by a pair of molds closed with a mold,
A method for molding an optical member, comprising: dividing a cavity in a mold closing direction with a core disposed between opposing molding surfaces of the mold, and injecting a resin into each divided cavity.   2. The method for molding an optical member according to claim 1, wherein injection molding is performed in such a manner that the dividing surface of the mold sandwiches at least a part of the peripheral edge of the core. An optical system that includes a fixed mold and a movable mold that can move toward and away from the fixed mold, and injects resin into a cavity defined by the pair of molds that are closed. In a member forming apparatus,
An apparatus for molding an optical member, comprising: a core disposed between opposing molding surfaces of the mold and dividing the cavity in a mold closing direction of the mold.   4. The optical member molding apparatus according to claim 3, wherein the core is configured so that at least a part of a peripheral portion thereof is sandwiched between the mold dividing surfaces that are clamped.

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