JP2016141116A - Production device of light shielding member, production method of the light shielding member, and the light shielding member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method of a light shielding member, in which the light shielding member, where apertures (openings) each having a satisfactorily effective diameter are arrayed in a lattice shape in the longitudinal direction, can be molded integrally in high yield and with high precision.SOLUTION: Cavity metal molds 39, 40, each of which is used for forming a cavity 15 for forming an external shape of the light shielding member 2, and core pins 30, 31, which are inserted into the cavity 15 from the outside respectively through the cavity metal molds and have the same number as that of the openings, are used. Each of the core pins 30, 31 supported respectively by core members 41, 42 has an engagement surface to be positioned/engaged mutually to form one opening as a whole and a metal mold surface for forming a partition wall. The production method of the light shielding member 2 comprises the steps of: packing a molten resin in the space formed between the metal mold surfaces of the core pins 30, 31 inserted into the cavity 15 of a mold clamped state; molding the partition wall 7 of the light shielding member 2; cooling the whole of a molding unit; and withdrawing the core pins 30, 31 to such a direction that the metal mold surface is separated from the partition wall 7.SELECTED DRAWING: Figure 7

Description

  The present invention provides a light-shielding member manufacturing apparatus, a light-shielding member manufacturing method, and a manufacturing method in which a plurality of openings that allow light beams to pass through the partition walls are regularly arranged in the longitudinal direction and adjacent openings are shielded from each other by the partition walls The present invention relates to a light shielding member manufactured by the method.

  2. Description of the Related Art An electrophotographic image forming apparatus (such as a printer or a copier) uses a configuration in which an electrostatic latent image is formed on a photosensitive member by scanning with recording light modulated with an image signal. Conventionally, a scanning system using a polygon mirror or the like has been used for scanning this type of recording light. However, a method of exposing a photosensitive member using a solid exposure element array is considered.

  The solid-state exposure element array has a configuration in which a large number of solid-state exposure elements such as LEDs are arranged in a line, and the irradiation light of each solid-state exposure element as a light source is controlled to irradiate the recording light of a specific pixel of the scanning line, thereby Then, an area corresponding to one line of the photosensitive member is exposed. The solid exposure light emitting element unit includes a solid exposure element array as a light source, an imaging means such as a microlens array (MLA), a light shielding member described below, and the like. An imaging means such as a microlens array is used to image the irradiation light of each solid-state exposure element on the surface of the photoconductor, but a light-shielding member is arranged to prevent recording light from crosstalk between adjacent pixels. There is a need to. Such a light-shielding member is disposed, for example, between the solid-state exposure light-emitting element unit and the microlens array, or between a plurality of microlens arrays when a plurality of microlens arrays are disposed.

  In this light shielding member, adjacent apertures (openings) are isolated by a partition so as to be kept in a light-shielded state, and a plurality of openings through which the recording light of each pixel passes are arranged in one or two rows in a lattice shape in the longitudinal direction. As described above, they are regularly arranged. The apertures of the light shielding member are arranged at the same arrangement pitch as each pixel (solid exposure light emitting element) of the solid exposure light emitting element unit.

  The aperture is formed, for example, as a rectangular hole having a rectangular cross section having an effective diameter of about 1.6 × 0.86 mm. In the solid exposure light emitting element unit of this scale, the partition wall thickness between the apertures (openings) is about 0.1 mm, And tend to be very thin. The number of pixels in one line of the solid-state exposure light-emitting element unit is at least about several hundred pixels if it is a practical level unit. Of course, a light shielding member having apertures with the number of pixels of the solid exposure light emitting element unit, the number matching the pixel pitch, and the arrangement pitch is required.

  Such a light shielding member may be formed by integral molding of a resin (described later) such as black having a high light shielding property. However, the partition wall between the apertures of the light shielding member is very thin, about 0.1 mm, and preferably, the inner surface of the partition wall needs to be subjected to an antireflection treatment. There is.

  Patent Document 1 discloses a structure for integrally molding this type of light shielding member. The fixed-side core pin pieces and the movable-side core pin pieces are alternately engaged with each other, and the clearance is filled with a resin to form a partition wall portion of the aperture. A configuration is also disclosed in which a difference is provided in the angle of draft with respect to the partition wall of the fixed side core pin piece and the movable side core pin piece so that the part of the partition wall can be stably released.

  Patent Document 2 discloses a structure for injection-molding a part which is not a light shielding member but is regularly arranged with thin portions such as fan blades. In Patent Document 2, a portion of a thin wall structure (blade) is formed by injecting a resin into a gap formed by engagement of two divided core pin pieces. At the time of mold release, the two core pin pieces are guided by the slopes of the core pin pieces of each other and slide in an oblique direction, thereby releasing the restriction of the thin wall structure (blade) and reducing the mold release resistance. Considered.

JP 2013-52557 A JP 2007-38637 A

  As described above, it is preferable to apply an antireflection treatment to the inner surface of the light shielding member, particularly to the inner surface of the partition wall to isolate the apertures and prevent crosstalk. As this antireflection treatment, rough surface processing such as embossing and satin processing, and methods such as painting can be considered, but secondary processing such as painting on molded products can be considered, but there is a problem that costs increase It is required that the light shielding member be formed at the same time as the molding.

  For example, it is conceivable that a rough surface is formed by shot blasting or the like on the surface of the core pin piece of the mold that forms the partition wall portion of the aperture of the light shielding member, and this is transferred to a resin to form a diffusion surface.

  However, according to the configuration of Patent Document 1, when a rough surface processing is performed on the partition wall portion core pin of the aperture, this surface acts as an undercut portion in the mold release direction of the partition wall. As a result, not only an effective diffusion surface cannot be formed by causing scratches on the inner surface of the partition wall of the aperture at the time of mold release, but there is a possibility that a thin partition wall may be broken and detached. In addition, there is a possibility that the part of the partition wall may be turned over or deformed, and even with a light-shielding member that is not damaged, the dimensional accuracy is lowered, and the expected light-shielding or optical path regulation effect may not be obtained. is there. Also, resin debris is generated due to undercut, which remains in the mold and affects the opening and closing of the mold, or the resin debris attached to the molded product is diffused in the image forming apparatus after mounting, and the image quality of the formed image May be reduced.

  In order to smoothly release an undercut portion such as a rough surface for antireflection processing, a configuration in which a draft angle is provided on a mold surface forming a partition wall portion is also conceivable. However, in the mold configuration as described in Patent Document 1, it is necessary to ensure a considerably large draft, and there is a possibility that the effective aperture diameter is reduced by the slope of the draft. For example, a rough surface that can be expected to have an antireflection effect needs to have a surface roughness of about 20 μm (RMS). In the case of a general resin material, the draft angle needs to be about 4 °. In order to ensure the required aperture pitch while leaving such a gradient in the partition wall, the effective diameter of the aperture must be considerably small.

  According to the configuration of Patent Document 2, since the mold surface slides in an oblique direction on one surface of the thin wall portion, there may be an undercut portion such as rough surface processing. However, since the mold surface of the other wall portion facing the wall portion slides in parallel, the same problem as described above may occur if the mold surface is roughened.

  As described above, in the prior art, apertures (openings) having sufficient effective diameter are separated by a very thin partition wall so as to be kept in a light-shielding state, and one or more rows are arranged in a lattice shape in the longitudinal direction. It is difficult to integrally mold the light shielding member. In particular, when the inner surface of the thin partition wall that isolates the aperture is used as an antireflection surface (diffusion surface), the difficulty further increases.

  In view of the above, the problem of the present invention is that apertures (openings) that are separated from each other by the partition walls so as to be kept in a light-shielding state, have a sufficient effective diameter, and have excellent light-shielding performance are arranged in a lattice shape in the longitudinal direction. An object of the present invention is to enable the light shielding member to be integrally molded with good yield and high accuracy.

  In order to solve the above problems, in the present invention, a plurality of openings through which light beams pass through the partition walls are regularly arranged in a lattice shape in the longitudinal direction, and adjacent openings are shielded from each other by the partition walls. 1st cavity metal mold | die which defines the cavity equivalent to the external shape of the said light-shielding member in the state clamped and mutually contacted in the manufacturing apparatus of the light-shielding member which integrally molds the light-shielding member kept, and 2nd cavity The first core pin of the same number as the opening is arranged in a comb shape so as to be inserted into the cavity through the first cavity mold from the outside of the first cavity mold. 1 core member, and the same number of second core pins as the openings are comb teeth so as to pass through the second cavity mold from the outside of the second cavity mold and be inserted into the cavity. And adjacent first and second core pins inserted into the cavity, the first and second core pins defining one of the openings as a whole. An engagement surface for positioning and engaging with each other, and a mold surface defining the partition wall, and the first and second cavity molds are inserted into the cavity defined by closing the mold. The space defined between the mold surfaces of the first and second core pins is filled with resin to form the light shielding member, and after cooling, through the first and second core members A configuration is adopted in which the first and second core pins are removed in a direction in which the mold surfaces of the first and second core pins are separated from the partition walls.

  Alternatively, a plurality of openings for allowing light to pass through the partition walls are regularly arranged in a lattice shape in the longitudinal direction, and a light shielding member in which the adjacent openings are kept in a light shielding state by the partition walls using a mold. In the method of manufacturing a light shielding member that is integrally molded, the mold is clamped and in contact with each other, a first cavity mold that defines a cavity corresponding to the outer shape of the light shielding member, and a second cavity mold A first mold pin and the same number of first core pins as the openings are arranged in a comb shape so as to be inserted into the cavity through the first cavity mold from the outside of the first cavity mold. And the same number of second core pins as the openings are arranged in a comb shape so as to pass through the second cavity mold from the outside of the second cavity mold and be inserted into the cavity. And the adjacent first and second core pins inserted into the cavity, the first and second core pins as a whole define one of the openings. An engagement surface for positioning and engaging each other, and a mold surface defining the partition wall, and the first and second cavity molds are inserted into the cavity defined by closing the mold A filling step of filling a space defined between the mold surfaces of the first and second core pins with a resin; and after cooling of the resin, the first and second core members are used to insert the first An extraction step of extracting the first and second core pins in a direction in which mold surfaces of the first and second core pins are separated from the partition; and after the extraction step, the first and second cavity molds are A mold opening process for opening the mold. It was adopted.

  With the above configuration, the light shielding member which is isolated so as to be kept in a light shielding state by the partition walls, has a sufficient effective diameter, and has apertures (openings) excellent in light shielding performance arranged in a lattice shape in the longitudinal direction has a high yield. Moreover, it can be integrally formed with high accuracy.

2 shows an image recording device configuration, (A) is an exploded view of the image recording device using a solid exposure element, (B) is a cross-sectional view of the image recording device, and (C) is a side view showing the operation of the image recording device. It is. The light-shielding (aperture) member integrally molded by this invention is shown, (A) is a top view of a light-shielding member, (B) is sectional drawing of a light-shielding member. The structure and operation | movement of the shaping | molding apparatus to which this invention is applied are shown, (A), (B), (C) is sectional drawing in the different shaping | molding process of a shaping | molding apparatus. The operation | movement of the shaping | molding apparatus to which this invention is applied is shown, (A), (B), (C), (D) is sectional drawing which showed operation | movement of the metal mold | die of the apparatus. 2 shows the configuration of the light shielding member of FIG. 2 in relation to the structure of the molding apparatus, where (A) is a front view of the light shielding member and (B) is a cross-sectional view of the light shielding member. 1 shows a different configuration of a molding apparatus to which the present invention is applied, (A) is a sectional view of the molding apparatus, (B) is a sectional view of a movable side, a fixed side template and a core pin, and (C) is a movable side template. It is the perspective view which showed. In the configuration of FIG. 6, (A), (B), and (C) are cross-sectional views showing the operation of the mold. The molded product containing the light-shielding member released from the molding apparatus to which the present invention is applied is shown, (A) is a sectional view of the molded product, and (B) is an enlarged view of a partition wall portion of the molded product. The structure of the core pin to which this invention is applied is shown, (A) is a perspective view of a core pin, (B) is sectional drawing of a core pin. It is sectional drawing which showed the different structure of the core pin to which this invention is applied. It is sectional drawing which showed the further different structure of the core pin to which this invention is applied. The structure of the different image recording device with which the solid exposure element and the aperture were arranged in 2 rows is shown, (A) is an exploded view of an image recording device, (B) is along the BB line of the light-shielding member of (A). Sectional drawing and (C) are perspective views of the core pin which shape | molds the light-shielding member of (B). For example, FIG. 3 and FIG. 4 show problems when the core pin is cut out first. (A) is a sectional view of the mold plate and the core pin on the movable side and the fixed side, and (B) is a roughened portion. It is explanatory drawing which showed the produced stress.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to embodiments shown in the accompanying drawings. The following embodiment is merely an example, and for example, a detailed configuration can be appropriately changed by those skilled in the art without departing from the gist of the present invention. Moreover, the numerical value taken up by this embodiment is a reference numerical value, Comprising: This invention is not limited.

  1A to 1C show the structure of a solid exposure light emitting element unit using a solid exposure element array, and FIGS. 2A and 2B show a light shielding member (aperture) used in the solid exposure light emitting element unit. The structure of a member is shown. In the present embodiment, an apparatus and a manufacturing method for forming the light shielding member will be described.

  As shown in FIG. 1A, the solid exposure light emitting element unit includes, for example, a solid exposure element array 4 in which a large number of solid exposure elements 9 such as LEDs are arranged, a microlens array (MLA) 1 and 1, and a light shielding member 2. Composed.

  The microlens arrays 1 and 1 are formed by arranging a large number of microlens elements 1 ′ in a row, and are integrally formed using a resin material having optical transparency. As shown in FIG. 1B, the microlens arrays 1 and 1 are arranged so that the irradiation light of the solid exposure element 9 of the solid exposure element array 4 is imaged (12) on the surface of the photoreceptor.

  As shown in FIG. 1A, the light shielding member 2 has the same arrangement as the microlens elements 1 ′ of the microlens arrays 1 and 1 so as to prevent the crosstalk of the recording light of the solid exposure element 9 corresponding to the recording pixels. A large number of openings 8 are arranged at a pitch. The plurality of openings 8 through which the light beam of the recording light passes are regularly arranged in a lattice shape in the longitudinal direction across the partition wall 7. Although the illustration of the light shielding member 2 is omitted in FIG. 1B, the light shielding member 2 is disposed between the microlens arrays 1 and 1 as shown in FIGS.

  As shown in FIG. 1C, the light shielding member 2 is disposed one by one between the microlenses 1 ′ and 1 ′ of the microlens arrays 1 and 1, and the opening 8 defined by the partition wall 7 is The light shielding member 2 is kept in a light shielding state with a partition wall 7 therebetween. That is, the recording light beam irradiated from one of the solid exposure elements 9 is reflected (or diffused) by the partition 7 like 13A and 13B so as not to enter the opening 8 corresponding to the other solid exposure elements 9. Be blocked.

  2A and 2B show examples of the shape of the light shielding member 2. FIG. 2A shows an upper surface of the light shielding member 2, and FIG. 2A shows a longitudinal section of the light shielding member 2 in the longitudinal direction. The light shielding member 2 has a substantially rectangular parallelepiped shape as a whole, and has a structure having relatively thick side walls 11 and 11 and a large number of openings 8 arranged at the center thereof via the partition walls 7.

  The light shielding member 2 is integrally formed from a resin material having a low reflectance such as black, using a mold as described later, including the partition 7 and the opening 8. At that time, the opening 8 (aperture) is configured as a rectangular cross section having an effective diameter of about 1.6 × 0.86 mm. Further, in a solid exposure light emitting element unit of a practical level, the thickness 7A of the partition wall 7 that isolates the opening 8 (aperture) is about 0.1 mm as described above and needs to be formed very thin.

  Moreover, the inner surface of the opening 8 (aperture), in particular, the inner surface of the partition wall 7 is preferably formed of an antireflection surface 14 such as a satin finish. The antireflection surface 14 of the partition wall 7 may be formed by post-processing after the light shielding member 2 is molded, but it is desirable that it can be formed simultaneously with the light shielding member 2 from the viewpoint of man-hours and costs.

  However, since the thickness (7A) of the partition wall 7 that isolates the opening 8 (aperture) is as thin as about 0.1 mm, it is reflected by a technique such as roughening the die surface that forms the partition wall 7, for example. It is very difficult to construct the prevention surface 14. If the surface of the mold forming the partition wall 7 is roughened, this surface becomes a so-called undercut, and if the core mold is released in parallel with the partition wall 7, the thin partition wall 7 may be damaged. There is a possibility of deformation.

  Therefore, the light shielding member manufacturing apparatus according to the present embodiment forms the thin partition wall 7 without damaging it due to the configuration of the mold and particularly the draft angle of the core pin forming the partition wall 7, and the antireflection surface 14 is formed on the partition wall 7. Is formed.

  Hereinafter, with reference to FIGS. 3A to 3C, FIGS. 4A to 4D, and FIGS. 5A and 5B, the light shielding member manufacturing apparatus of the present embodiment will be described.

  3A to 3C show a light shielding member manufacturing apparatus of this embodiment, particularly a cross-sectional structure of a mold. In FIGS. 3A to 3C, illustration of the molding apparatus other than around the mold is omitted.

  The main part of the mold for integrally molding the light shielding member 2 is composed of first and second cavity molds 39 and 40 and first and second core pins 30 and 31. The first and second cavity molds 39 and 40 define a cavity 15 that defines the outer shape of the light shielding member when the molds are clamped and in contact with each other. Which of the cavity molds 39 and 40 is a fixed side or a movable side is arbitrary, but here, for convenience, the cavity mold 39 is a fixed side mold and the cavity mold 40 is a movable side mold. And

  In the case of the present embodiment, the main parting 100 (parting line) with which the cavity molds 39 and 40 contact is inclined, and an angle indicated by 17 (for example, 8 °) with respect to the vertical direction 16 of the molding apparatus (not shown). Graded). The cavity 15 having a shape corresponding to the rectangular parallelepiped shape of the entire light shielding member 2 defined by the cavity molds 39 and 40 is also inclined by the same angle.

  FIGS. 5A and 5B show the light shielding member 2 molded in the cavity 15 in the same posture as in the cavity molds 39 and 40. 5A shows the light shielding member 2 from the incident side (or emission side), and FIG. 5B shows the light shielding member 2 from the side surface.

  5A and 5B, the dimensions of the partition wall 7 defining each opening 8 of the light shielding member 2 are, for example, 1.6 mm in the short direction (27) of the light shielding member 2, and the length of the light shielding member 2 is long. The direction (26) is 0.87 mm. The wall thickness (7A) of the partition wall 7 is 0.1 mm, and the thickness (44) or height (optical path length) of the light shielding member 2 is 2.0 mm.

  The partition walls 7 constituting the openings 8 functioning as apertures are formed parallel to the optical axis 20 of each opening 8 and perpendicular to the reference surface 20 ′ of the light shielding member 2. The openings 8 are regularly arranged at a pitch 43 in the longitudinal direction. In a light shielding member used in a solid exposure light emitting element unit at a practical level, it is necessary to form openings 8 corresponding to about 250 pixels or more and a number of partition walls 7 corresponding thereto. On the other hand, in this specification, for simplification, only about 7 to 8 openings 8 and the corresponding number of partition walls 7 or a mold structure for molding them are shown. Therefore, in an actual light shielding member manufacturing apparatus, it is necessary to configure each part of the mold by expanding the scale of the opening 8 and the partition wall 7 (particularly numerically) in this specification.

  Antireflection surfaces 14 (14a, 14b) are formed on both surfaces of each partition wall 7. The antireflection surface 14 is formed by roughening the die surfaces (30 s, 31 s) of the core pins 30, 31 described later. A shot blasting method can be used for roughing the mold surfaces (30 s, 31 s). The surface roughness of the antireflection surface 14 is, for example, about 20 μm by RMS.

  The cavity 15 (FIG. 3) is arranged with a predetermined angle (17: 8 ° in FIG. 3A, for example, 8 °) with respect to the vertical direction (16 in FIG. 3A) with respect to the reference surface 30 of the light shielding member. . For this reason, the partition wall 7 is disposed so as to be inclined at the same predetermined angle (17 in FIG. 3A: for example, 8 °) with respect to the horizontal direction (65 in FIG. 3A).

  In FIG. 3A, the horizontal direction (65) coincides with the opening / closing direction of the mold, and the vertical direction (16) coincides with a direction orthogonal to the opening / closing direction of the mold. Here, the opening and closing direction of the mold is a direction in which the cavity molds 39 and 40 (or the core pins 30 and 31 and the core members 41 and 42 supporting the cavity pins 39 and 40) are opened and closed by a molding apparatus (not shown). is there. That is, the cavity 15 that defines the entire shape of the light shielding member 2 is inclined by the predetermined angle (17 in FIG. 3A: 8 °, for example) with respect to the direction orthogonal to the opening / closing direction of the mold. Are disposed inside the cavity molds 39 and 40.

  The mold surfaces of the core pins 30 and 31 subjected to rough surface processing that define the partition wall 7 described later are released from the molded partition wall 7 (the antireflection surface 14 thereof) with a draft (17, that is, 8 °). Thereby, the metal mold | die surface of the core pins 30 and 31 roughened can be released from the partition 7, without damaging or deform | transforming the partition 7 after a shaping | molding.

  The reason why the cavities 15 are inclined as described above is that the mold surface that simultaneously defines the partition walls 7 while removing the core pins 30 and 31 in the horizontal direction (65) after resin injection and cooling. This is because the mold is released from the partition wall 7 with the draft as described above. However, in order to remove the core pins 30 and 31 without damaging or deforming the partition wall 7 after molding, it is sufficient that the draft angle as described above is secured on the mold surface defining the partition wall 7. The inclined arrangement of the cavity 15 as described above is not always necessary. However, in that case, for example, it is necessary to consider that the removal direction of the core pins 30 and 31 is inclined with respect to the opening and closing direction of the mold, and the mechanism may be complicated.

  On the other hand, a mechanism for opening and closing the mold is provided by inclining the cavity 15 in a direction orthogonal to the opening and closing direction of the mold (cavity molds 39 and 40, core pins 30 and 31) as described above. Is remarkably simple and inexpensive. For example, the opening and closing direction of the cavity molds 39 and 40 and the extraction direction of the core pins 30 and 31 can both coincide with the mold opening direction (horizontal direction) of the molding apparatus, and the mold that defines the partition wall 7. The mold surface can be punched with a draft.

  The angle at which the cavity 15 is inclined in the direction perpendicular to the opening and closing direction of the mold is the same as the draft angle of the mold surface of the core pins 30 and 31 that are pulled out in the mold opening (horizontal) direction. Therefore, the inclination angle of the cavity 15 may be appropriately determined according to the surface roughness of the antireflection surface 14 to be formed on the partition wall 7.

  3A to 3C, for example, the cavity molds 39 and 40 on the fixed side and the movable side have core pins 30 and 31 to be described later by springs 37 and 37 (...) and springs 38 and 38 (...), respectively. The core members 41 and 42 to be supported are combined.

  For example, the fixed-side and movable-side core members 41 and 42 are supported by, for example, fixed-side and movable-side templates 56 and 57, respectively. The fixed-side template 56 is fixedly supported by a molding device (not shown), while the movable-side template 57 is supported by a guide rail or the like of the molding device (not shown), and the horizontal direction (65) in the figure. To open and close the mold.

  The springs 37 and 38 constitute an interlocking mechanism for performing so-called leading-out control of the first and second core pins 30 and 31. That is, this interlocking mechanism performs the removal of the first and second core pins 30, 31 by the first and second core members 41, 42 and the opening of the first and second cavity molds 39, 40. Interlock. For example, when the first and second core members 41, 42 are opened by the mold plates 56, 57, the first and second cavity molds 39, 40 are closed by the pressing force of the springs 37, 38. (FIG. 3B).

  The spring constants of the springs 37 and 38 are determined in advance through experiments and the like so that a pressing force that can maintain the mold closed state of the cavity molds 39 and 40 can be generated even when the core members 41 and 42 are opened. . That is, the spring constants of the springs 37 and 38 overcome the biting force 66 acting between the mold surfaces 30s and 31s of the core pins 30 and 31 and the antireflection surfaces 14 and 14, as shown in FIG. The cavity molds 39 and 40 are determined so that the mold closed state can be maintained.

  The first and second cavity molds 39 and 40 are kept in the closed state until the springs 37 and 38 are fully extended (on the verge), and during that time, the mold opening operation of the core members 41 and 42 is continued. Thus, the first and second core pins are removed from the cavity 15. Thereafter, the mold plates 56 and 57 are further opened widely, and when the springs 37 and 38 are fully extended, the first and second cavity molds 39 and 40 are opened (FIG. 3C).

  As described above, by providing a simple and inexpensive interlocking mechanism using the springs 37 and 38, the core pins 30 and 31 can be removed in advance by simply opening the core members 41 and 42. Then, if the core members 41 and 42 are further opened, the cavity molds 39 and 40 can be opened, and the molded light shielding member 2 can be ejected and taken out.

  Sprue bushes 50b and 50b are disposed below the core members 41 and 42 so as to penetrate the mold plates 56 and 57 and the cavity molds 39 and 40, respectively. The sprue bushes 50 b and 50 b are divided so as to be continuous with the cavity molds 39 and 40 and the main parting 100.

  Inside the sprue bushes 50b and 50b, a sprue 50 having a tapered cross section is formed as a resin injection path. The space of the sprue 50 further communicates with the lower portion of the cavity 15 via the runner 51 and the gate 51 ′ formed between the cavity molds 39 and 40. A plasticizing cylinder 49 of the molding device is disposed in contact with the fixed side sprue bush 50b, and molten resin can be injected through the sprue bush 50b.

  When filling the resin, each mold part is kept at a constant temperature by a mold temperature controller (not shown) of the molding apparatus, and the resin material melted by the plasticizing cylinder 49 of the molding machine is sprue 50, runner. 51, the mold cavity 15 is filled at high speed via the gate 51 '. Since the clearance 34 forming the partition wall 7 is as thin as 0.1 mm, it is necessary to fill the flowing resin before cooling solidification by high-speed filling. In the case of the shape and size in the present embodiment, the filling time is approximately 0.2 seconds. In addition, the resin temperature to be melted by the plasticizing cylinder 49 and the temperature at which the mold is kept warm are set to high conditions. Thereby, the filling property to the thin partition wall 7 can be improved.

  On the other hand, an ejector mechanism is disposed in the space 57 a in the template 57. This ejector mechanism is composed of ejector pins 111, 112, 113 supported by a plate 114, for example. These ejector pins 111, 112, 113 are operated by an ejector driving unit on the molding apparatus side via a plate 114.

  The ejector pins 111 and 112 are arranged so as to penetrate through the core members 41 and 42 to the cavity molds 39 and 40 so that the upper and lower ends of a corresponding portion of the light shielding member 2 of the molded product can be pushed out. The ejector pin 113 is disposed so as to penetrate the center of the movable side sprue bush 50b. The tip of the ejector pin 113 is formed as an undercut that allows the sprue 50a (FIG. 3C) of the molded product to be pulled out from the sprue 50 (FIGS. 3B to 3C) when the mold is opened.

  3A to 3C show a state in which the mold pins are closed, a state in which the core pins 30 and 31 are pre-cut during the mold opening, and the ejector pins 111, 112, and 113 after the mold opening is finished. The molded product including the member 2 is ejected. In the mold mechanism shown in the figure, a passage for cooling the mold is provided inside the mold plates 56, 57, etc., but these illustrations are omitted in this specification.

  The structure of the core pins 30 and 31 that define and particularly form the partition wall portion of the light shielding member 2 will be described in detail later, and here, the operation process of the entire mold when the light shielding member 2 is molded will be described first. To do.

  First, the movable mold plate 57 is moved to the right in the drawing via a driving mechanism (not shown) of the molding apparatus, and the mold plates 56 and 57 are closed as shown in FIG. The In this state, molten resin can be injected through the plasticizing cylinder 49. The resin flows into the cavity 15 through the sprue 50, the runner 51, and the gate 51 '.

  In the state of FIG. 3A, the first and second core pins 30 and 31 are inserted in the central portion of the cavity 15. When the light shielding member 2 as shown in FIGS. 2A, 2 B, 5 A, and 5 B is formed, the width of the core pins 30 and 31 (in the direction perpendicular to the paper surface) is smaller than the width of the cavity 15. Thereby, the both ends of the light shielding member 2 and the side wall (11) are formed by the resin that has flowed around the core pins 30 and 31.

  Further, as will be described later, the die pins 30s and 31s forming the partition wall 7 and the engaging surfaces 30t and 31t are formed by positioning and engaging with each other at the tip portions of the core pins 30 and 31, respectively (FIG. 4). (B)). When the engagement surfaces 30 t and 31 t inserted into the cavity 15 are engaged, the core pins 30 and 31 seal the space inside one of the openings 8. The mold surfaces 31 s and 30 s are formed so as to be separated from each other by the thickness of the partition wall 7, and the resin flows into the space laterally (perpendicular to the paper surface) to mold the partition wall 7 portion of the light shielding member 2. The At this time, the ejector pins 111 and 112 are inserted to a position in contact with the cavity 15. Further, the ejector pin 113 is inserted with the undercut portion at the tip thereof to the portion of the sprue 50, and the portion functioning as the sprue lock is also filled with the resin.

  After filling and cooling the resin, when the movable first and second core members 41 and 42 are opened by the mold plates 56 and 57 as shown in FIG. 3B, the pressing force of the springs 37 and 38 causes the first The first and second cavity molds 39 and 40 are kept closed. On the other hand, the first and second core pins 30, 31 are moved relative to the cavity molds 39, 40 via the first and second core members 41, 42 supported by the mold plates 56, 57. , 53. At this time, as will be described later, the mold surfaces 30s and 31s of the core pins 30 and 31 are extracted from the cavity 15 inclined by a predetermined angle (17: 8 °). 7 (FIGS. 4B and 4D).

  Furthermore, the movement of the movable mold plate 57 is continued, the mold plates 56 and 57 are opened, and the springs 37 and 38 are fully extended (80 and 81 in FIG. 3B), and the first and second core pins 30 and 31 is removed from the cavity 15. Thereafter, when the movable mold plate 57 continues to move, the first and second cavity molds 39 and 40 start to open after the springs 37 and 38 are fully extended. FIG. 3C shows a state in which the mold plates 56 and 57 are opened until a space necessary for taking out the molded product is secured. FIG. 3C shows a state in which the ejector pins 111, 112, and 113 are ejected by the plate 114, and the portions of the molded product light shielding member 2 to gate 51'a to runner 51a to sprue 50'a are ejected.

  Note that the mold opening (or mold closing) by the mold plates 56 and 57 overlaps each other in a state where at least the distal end portions of the first and second core pins 30 and 31 are engaged to the inside of the opening 8. It is desirable to perform at low speed in the section. If the mold opening is performed at a high speed in this region, there is a possibility that a rapid dissociation force acts between the core pins 30 and 31 engaged so far, and the core pin is damaged. If the mold closing is too fast, the core pin may be damaged by the impact force of the contact between both core pins. By performing mold opening (or mold closing) by the mold plates 56 and 57 at a low speed, the above problem can be avoided.

  From this state, the entire molded product can be recovered by removing the portion of engagement between the sprue lock at the tip of the ejector pin 113 and the spur 50'a of the molded product. The molded product may be taken out upward manually or by a robot, or may be dropped and collected on a transport device (not shown) disposed below.

  FIG. 8A shows a longitudinal section of a molded product including the light shielding member 2. FIG. 8B is a cross-sectional view taken along line AA in FIG. As shown in FIG. 8 (A), the molded product includes the light shielding member 2 to the gate 51 ′ a to the runner 51 a to the sprue 50 ′ a, and the opening 8 isolated by the partition wall 7 is molded. As shown in FIG. 8B, an antireflection surface 14 is formed on the inner surface of the partition wall 7 by roughing the mold surface 30 s of the core pin 30. Unnecessary reflection can be suppressed and desired optical performance can be ensured.

  Here, with reference to FIGS. 4A to 4D, the configuration and operation of the first and second core pins 30 and 31 that define and form the opening 8 and the partition wall 7 of the light shielding member 2 will be described in detail. explain. 4 (A) and 4 (B) show cross sections of the core pins 30 and 31 in the mold closed state and in the mold open (midway), respectively. FIG. 4C shows a cross section of the first and second cavity molds 39 and 40, the core members 41 and 42, and the core pins 30 and 31 in the mold closed state. FIG. 4D shows a state in which the core pins 30 and 31 are virtually removed through the core members 41 and 42 in order to show the shape and operation of the mold. 4 (C) and 4 (D), illustration of each ejector pin is omitted.

  As shown in FIGS. 4 (A) and 4 (B), the first and second core pins 30 and 31 are positioned and engaged with the mold surfaces 30s and 31s forming the partition walls 7 at the tip portions thereof, respectively. Engagement surfaces 30t and 31t are formed. The inclination angles 19, 19 (FIG. 4A) of the mold surfaces 30s, 31s are the same as the inclination angle (17: 8 °) from the vertical direction of the cavity.

  By engaging the engaging surfaces 30t and 31t (FIG. 4B) of the first and second core pins 30 and 31, the space of the opening 8 is sealed so as not to be filled with resin. However, a slight amount of clearance 36 (for example, about 5 μm) is secured between the engagement surfaces 30t and 31t even when the mold is closed so that the fixed movable core pin does not come into contact with the mold due to deformation due to thermal expansion or the like. It is preferable to configure as described above. The clearance 36 can be formed by a method such as adjusting the total length of the core pins 30 and 31, but of course, the clearance 36 is set to such a distance that the resin does not enter and no burrs remain.

  On the other hand, the mold surfaces 30 s and 31 s facing the core pins 30 and 31 are configured to be separated by a distance sufficient to form the desired thickness of the partition wall 7. However, at the time of mold closing and casting, since the core pins 30 and 31 are elastically deformed by the molding pressure, this tends to increase the wall thickness of the partition wall 7. For this reason, for example, in the case of the partition wall 7 having a wall thickness of 0.1 mm, the clearance between the mold surfaces 30 s and 31 s that define the partition wall 7 may be set to about 0.095 mm.

  4 (A) and 4 (C), the space between the mold surfaces 30s and 31s is filled with resin from both sides (perpendicular to the plane of the paper), and the partition wall 7 is formed.

  As shown in FIG. 4A or 4B, the tip portions 30p of the plurality of core pins 30 are in contact with the concave bottom surfaces 31q between the plurality of core pins 31. Similarly, the tip portions 31 p of the plurality of core pins 31 abut against the concave bottom surfaces 30 q between the plurality of core pins 30. In the case of this embodiment, the widths of the recess bottom surfaces 30q and 31q are wider than the widths of the tip portions 30p and 31p, and the end portions (28: described later) of the partition walls 7 correspond to the tip portions 30p and 31p of the recess bottom surfaces 30q and 31q. It is formed by a part that is not in contact.

  As described above, after filling and cooling the resin, the core pins 30 and 31 are pre-cut as shown in FIG. 4B (FIG. 3B). At this time, in this embodiment, the core pins 30 and 31 are pulled out horizontally (in the mold opening direction) as shown in FIG. The mold surfaces 30 s and 31 s are inclined at a predetermined angle (19: 8 °) with respect to the horizontal direction (mold opening direction). For this reason, the mold surfaces 30 s and 31 s are separated from the inner surface of the partition wall 7 defined as shown in FIG. 4B with the draft angle of the predetermined angle.

  Accordingly, the mold surfaces 30 s and 31 s can be roughened to form the inner surface of the partition wall 7 as the above-described antireflection surface (14). According to the present embodiment, the mold surfaces 30 s and 31 s are separated from the partition wall 7 by the above draft without damaging or deforming the thin partition wall 7 even when the rough surface processing is performed. be able to.

  As described above, according to the present embodiment, the cavity molds 39 and 40 that define the cavity 15 that defines the outer shape of the light-shielding member, and the molds are inserted into the cavity 15 from outside. The same number of core pins 30 and 31 as the openings are used. The core pins 30 and 31 supported by the core members 41 and 42 have engagement surfaces 30t and 31t that are positioned and engaged with each other so that they collectively define one of the openings 8, and a mold surface that defines a partition wall. 30s and 31s. A space defined between the mold surfaces of the core pins 30 and 31 inserted into the cavity 15 in the mold-closed state is filled with resin to form the partition wall 7 of the light shielding member, and after cooling, the mold surface 30s. , 31 s with a draft in the direction away from the partition wall 7, the core pins 30, 31 are removed.

  With the configuration as described above, the apertures 8 that are separated from each other by the partition walls 7 so as to be kept in a light-shielding state, have a sufficient effective diameter, and are excellent in light-shielding performance are arranged in a lattice shape in the longitudinal direction. The light shielding member 2 can be integrally molded with good yield and high accuracy.

  In particular, a rough surface processing for the antireflection surface 14 of the partition wall 7 is performed on the mold surfaces 30 s and 31 s by removing the core pins 30 and 31 with a draft in a direction in which the mold surfaces 30 s and 31 s are separated from the partition wall 7. Even if applied, the mold can be released without damaging or deforming the partition wall 7. Thus, the antireflection surface 14 of the partition wall 7 can be formed by integral molding without requiring post-processing or the like. By providing the antireflection surface 14 on the partition wall 7 of the light shielding member 2, the light shielding property of the thin partition wall 7 can be improved, and the crosstalk of the recording light in each opening 8 can be reliably prevented.

  Furthermore, according to the present embodiment, the outer shape of the light shielding member 2 is defined inside the first and second cavity molds 39 and 40 with an inclination with respect to the direction orthogonal to the opening and closing direction of these molds. A cavity 15 is formed. The first and second core pins 30 and 31 are arranged so as to be inserted or removed from the cavity molds 39 and 40 in parallel with the opening / closing direction. With such a configuration, the insertion and removal directions of the first and second core pins 30 and 31 can be arranged in parallel with the opening and closing directions of the first and second cavity molds 39 and 40. Therefore, the first and second cavity molds 39 and 40 can be easily opened and closed using a general molding apparatus while ensuring the draft angle of the core pins 30 and 31, and the first and second core pins 30 can be opened and closed. , 31 can be inserted and removed.

  In the case of the present embodiment, the end portions (28, 28) of the partition wall 7 are directly defined by the concave bottom surfaces 30q, 31q of the core pins 30, 31. The portions of the recess bottom surfaces 30q and 31q are immediately separated from the end portions (28 and 28) of the partition wall 7 when the extraction of the core pins 30 and 31 is started after the resin is filled and cooled. At this time, if the biting force between the mold surfaces 30s and 31s and the inner surface of the partition wall 7 is large, the partition wall 7 may be damaged (deformed) when the mold is opened. For example, FIG. 4D virtually shows a state where the core pin 30 side is removed. As described above, if the mold surfaces 30s and 31s and the inner surface of the partition wall 7 are greatly bitten, or if the recess bottom surface and the end of the partition wall 7 are bitten, the partition wall 7 is cut off like 7x and 7x. Or it may be deformed.

  FIGS. 13A and 13B illustrate the problem of biting between the mold surfaces 30 s and 31 s of the partition wall 7 and the core pins 30 and 31 shown in FIG. FIG. 13B shows an enlarged cross section of the mold surfaces 30 s and 31 s of the core pins 30 and 31 and the partition wall 7 formed by filling a resin between them. In the same figure, by roughening the mold surfaces 30s and 31s, both surfaces of the partition wall 7 are densely filled with resin during the roughing of the mold surfaces 30s and 31s. 14 is formed. In this closed state, biting occurs between the rough surface processing of the mold surfaces 30 s and 31 s and the antireflection surfaces 14 and 14.

  When the core pins 30 and 31 are removed in the horizontal direction (mold opening direction) from this state, the rough surface processing of the mold surfaces 30s and 31s and the anti-reflection surfaces 14 and 14 are in the direction of minute unevenness, respectively. The corresponding biting force 66 works.

  From this state, as shown in FIG. 13A, when the core pins 30 and 31 are removed horizontally (52 and 53), the bottom surfaces 30q and 31q of the recessed portions of the core pins 30 and 31 are separated from the end portions 28 and 28 of the partition wall 7. The presser foot will not work. At this time, for the case where a large biting force (66: FIG. 13 (B)) is generated, the mold surfaces 30s and 31s cannot be separated from each other, causing mutual displacement, and the formed thin partition walls 7x, 7x, There is a possibility that the portion 7x (...) Is shredded and detached from the light shielding member 2. In FIG. 13 (A), the three partition walls 7x, 7x, 7x are separated in the left direction in the figure, but of course, depending on the balance of the biting force, the partition wall part may be shredded and separated in the opposite direction. Is also possible. A structure that solves such a problem will be described in Example 2 below.

  In the above embodiment, the end portions 28 and 28 of the partition wall 7 are directly defined by the concave bottom surfaces 30q and 31q of the core pins 30 and 31. The portions of the recess bottom surfaces 30q and 31q are immediately separated from the end portions 28 and 28 of the partition wall 7 when the extraction of the core pins 30 and 31 is started after the resin is filled and cooled, for example, to maintain the partition wall 7 in the longitudinal direction. Does not function as a presser foot.

  For this reason, when the rough surface processing of the mold surfaces 30 s and 31 s and the biting force 66 between the antireflection surfaces 14 and 14 are large as described above, the portion of the thin partition wall 7 is cut off and the light shielding member 2. There is a possibility of causing damage (or deformation) to the molded product so as to be detached from the molded product.

  Therefore, in this embodiment, the end portions 28 and 28 of the partition wall 7 are not directly defined by the bottom surfaces 30q and 31q of the core pins 30 and 31 as shown in FIG. To mold. In this embodiment, the regulation mold surface 29 is formed integrally with the cavity molds 39 and 40. The restriction die surface 29 may be constituted by a holding piece fixed to the cavity die 39, 40 side, but the strength against the molding pressure or the like is maintained by the structure integrally formed with the cavity die 39, 40. Can do.

  FIG. 6A shows the structure of the mold in this example. FIG. 6 (A) corresponds to FIG. 3 (A) and shows the cross section of the main part of the mold in a closed state, and the same or corresponding members as those in the structure of the above embodiment are denoted by the same reference numerals. doing. FIG. 6B shows a state in which the core pins 30 and 31 are slightly removed from the state of FIG. 6A in the horizontal direction (52 and 53). In the following, description will be made with emphasis on portions different from the structure of the above embodiment, and detailed description of the same or corresponding members will be omitted.

  In the case of the present embodiment, the base portions of the core pins 30 and 31 have a simple prismatic shape and are implanted and supported by the core members 41 and 42. The structures of the tips of the core pins 30 and 31 are the same as in the above embodiment, and the mold surfaces (30s and 31s) and the engagement surfaces (30t and 31t) forming the partition wall 7 are shown in the above embodiment. It is constructed in the same way as the one.

  On the other hand, the regulation mold surfaces 29, 29... Have a height (vertical direction in the figure) substantially corresponding to the pitch of the comb-shaped core pins 30, 30. Then, as shown in FIG. 6B, the core pins 30 and 31 are inserted through the middle of the regulation mold surfaces 29, 29... And separated from each other by the partition wall 7 and the partition wall 7 (see FIG. 6B). 8) is defined.

  FIG. 6C is a perspective view showing the movable cavity mold 40 integrally formed with the regulation mold surfaces 29, 29... From the excavation surface side of the cavity 15. Further, the cavity mold 39 is configured in substantially the same manner as the cavity mold 40 of FIG. 6 (C) except that the cavity 15 and the excavation surface have a different inclination.

  In FIG. 6C, the cavity mold 40 as a whole has a rectangular parallelepiped shape, but the parting surface (main parting) on which the upper cavity 15 is formed in the figure is the same as the lower part in the figure. The cavity 15 is inclined at a predetermined inclination angle (17: 8 °). The cavity 15 is excavated at the same inclination angle from the parting surface corresponding to its half body. Resin passages for the runner 51 and the gate 51 ′ are formed at the lower end (right side in the drawing) of the cavity 15.

  In FIG. 6 (C), the regulation mold surfaces 29, 29... Are arranged at the bottom center of the cavity 15. In the middle of the regulation mold surfaces 29, 29..., Through-holes 7a, 7a... Are arranged through the core pins 31 one by one in the mold opening / closing direction (horizontal direction in FIGS. 6A and 6B). ing.

  On the back surface of the cavity 15 of the cavity mold 40 (or 39), a space for accommodating the base portion of the core pin 31 and the core member 42 and enabling them to move in the horizontal direction is excavated (FIG. 6 ( A)). For this reason, as shown in FIG. 6 (B), the part of the restrictive mold surface 29 has a thickness of about 67 and 68. Since the thicknesses 67 and 68 of the regulation mold surface 29 tend to be thin, there is a possibility that a disadvantage may arise in terms of strength when configured by the cavity mold 40 (39) and a separate holding piece. However, when the cavity mold 40 (39) and the regulation mold surface 29 are integrally formed, a honeycomb structure in which the regulation mold surfaces 29, 29... And the through holes 7a, 7a. The above disadvantages in strength can be avoided.

  In the case of the cavity mold 40 according to the first embodiment, the regulation mold surfaces 29, 29... Are not provided, and one rectangular long hole penetrates over the entire arrangement region of the through holes 7a, 7a. It is.

  7 (A), 7 (B), and 7 (C) show the mold closed state, the state in the middle of mold opening, and the mold opened state of the main mold part of this embodiment provided with the regulation mold surfaces 29, 29, respectively. Each is shown.

  In the case of the present embodiment, as shown in FIG. 7A, the end portions 28 and 28 at both ends of the partition wall 7 are defined by regulating mold surfaces 29 and 29. The resin is filled into the cavity 15 through the runner 51 and the gate 51 '. The outer shape of the light shielding member 2 is formed by the cavity 15. Moreover, the part of the partition 7 is shape | molded by the resin with which it fills from the side (paper surface perpendicular | vertical direction) to the clearance gap between the metal mold | die surfaces (30s, 31s) of the core pins 30,31.

  After filling and cooling the resin, when the core members 41 and 42 are opened halfway through the mold plates 56 and 57 as shown in FIG. 7B, the core pins 30 and 31 are removed from the cavity 15. At this time, the mold closed state of the cavity molds 39 and 40 is maintained by the pressing force of the springs 37 and 38.

  In the present embodiment, the restricting mold surfaces 29 and 29 are formed integrally with the cavity molds 39 and 40 (or by a holding piece fixed to the cavity mold) as described above. Accordingly, as shown in FIG. 7B, therefore, even if the regulating mold surface 29 is pulled out of the core pins 30 and 31, the first mold closing is performed by the pressing force of the springs 37 and 38 together with the cavity molds 39 and 40. The same position as the state is maintained and does not move.

  That is, in this embodiment, the regulation mold surface 29 is supported by pressing the end portions 28 and 28 of the partition wall 7 from both sides, and the mold surfaces 30 s and 31 s are attached to the partition wall 7 as the core pins 30 and 31 are removed. The operation of releasing from the (antireflection surface on the inner surface) is performed. Therefore, according to the present embodiment, the breakage or deformation of the partition wall 7 is more stable and has a higher yield than the first embodiment that may cause the breakage of the partition wall 7 as shown in FIGS. It is possible to mold the light shielding member 2 having no dimensional accuracy.

  Thereafter, when the core members 41 and 42 are further opened through the mold plates 56 and 57, the cavity molds 39 and 40 are opened as shown in FIG. In this state, a molded product (the gate, runner, sprue, etc. are not shown) of the light shielding member 2 in which the partition wall 7 and the opening 8 are molded by an ejector pin (not shown) can be taken out.

  The structure of the core pins (30, 31) as shown in FIGS. 9 (A) and 9 (B) is 100 to 200 openings (8: aperture) in the light shielding member (2). The same number of core pins (30, 31) must be manufactured and attached to the core member. For this reason, it takes time to manufacture the mold, and the manufacturing cost may increase.

  Therefore, as shown in FIG. 10, a structure in which a plurality of core pins 30 or 31 are integrally formed may be used. That is, a plurality of core pins 30 or 31 are integrally formed on the core pin block 58 as a unit. The core pin block 58 in FIG. 10 is integrally processed so that a portion corresponding to the core pin 30 or 31 has the same outer shape as the core pin 30 or 31. The core pin block 58 is attached to the core member 41 or 42 and supported by these core members.

  The core pin block 58 can be configured simply and inexpensively by, for example, integrally machining the entire shape by wire electric discharge machining using a wire having a wire diameter of 0.1 on a metal plate.

  Further, the rough surface processing 46 for forming the antireflection surface (14) on the partition wall (7) can be easily formed by performing wire electric discharge processing under processing conditions where a desired surface roughness can be expected. Thereby, the rough surface processing 46 equivalent to shot blast construction can be given, and an antireflection surface (14) can be formed in a partition (7).

  According to the structure of FIG. 10, the processing of the core pin block 58 having the core pins 30 and 31 and the mounting to the core member 41 or 42 are extremely easy as compared to the configuration of the separate core pin of FIG. become. With the configuration as shown in FIG. 10, it is possible to reduce the labor for manufacturing the core pins 30 and 31, and to obtain a mold for molding the light shielding member (2) at low cost.

  Moreover, since the light shielding member (2) has a large aspect ratio and is long, the size of the thermal expansion in the longitudinal direction of the mold parts constituting the light shielding member (2) tends to be large. Further, since the frame division becomes complicated, the temperature distribution of the mold member also becomes non-uniform, and the magnitude of thermal expansion is not uniform and may be partially different. If the magnitude of the thermal expansion differs between the fixed side and the movable side, the positional accuracy cannot be maintained, and contact damage may occur when the core pin is engaged.

  In particular, in the integrated core pin block 58 as shown in FIG. 10, it may be necessary to remanufacture all the parts if the processing accuracy is not partially obtained at the initial production of the core pins. In consideration of this point, when the light shielding member (2) having an opening (8: aperture) corresponding to 100 to 200 pixels is actually formed, the core pin block 58 uses a divided structure as shown in FIG. Can do. For example, the core pin block 58 is divided and manufactured in units of several core pins to several tens of pins (arbitrary number), and attached to the core members 41 and 42. That is, a plurality of core pins 30 to 31 are integrally formed on the core pin block 58 in units of the plurality. A plurality of core pin blocks 58 are attached to and supported by the core members 41 and 42.

  Thus, by manufacturing the core pin block 58 by dividing it in an arbitrary region, it is possible to cope with troubles such as contact breakage at the time of processing the core pin block or at the time of opening and closing the mold while suppressing the manufacturing cost.

  In the above, a configuration was considered in which the microlens elements (1 ') of the microlens array (1) and the openings (8: apertures) of the light shielding member (2) are arranged in one row. However, a structure in which the microlens elements of the microlens array and the openings of the light shielding member are arranged in a plurality of rows is also conceivable. In such a structure, for example, a plurality of solid exposure element microlens elements and apertures can be used to record one pixel to increase the recording light amount. In addition, depending on the arrangement of the microlens elements and apertures (apertures), it is possible to record different pixels in each column, and it is possible to record high-definition images and improve the recording speed. .

  For example, as shown in FIG. 12 (A), when the microlens arrays 201 and 201 are arranged in front of the solid exposure element array 4 with the light shielding member 202 interposed therebetween, a plurality of openings 8 and microlens elements 201 ′ are provided. It is conceivable to adopt a column (in this case, two columns) configuration.

  In this example, the openings 8 of the light blocking members 202 in each row in front of the solid exposure elements 9 and the microlens elements 201 ′ of the microlens array 201 are arranged in a staggered arrangement. The pixel density can be improved by using separate solid exposure elements 9 as the light sources independently for the individual openings 8 and the microlens elements 201 '.

  As described above, if different light sources are independently assigned to the individual apertures 8 and the microlens elements 201 ′, in addition to the partition walls 7 that separate the individual apertures 8 described above, two rows of apertures 8 of the light shielding member 202 are provided. A partition wall 61 extending in the longitudinal direction is necessary so as to isolate and shield the light from each other. In such an optical design, it is desirable to form antireflection surfaces (62 and 63 below) on both sides of the partition wall 61 in order to improve the light shielding performance and reduce the crosstalk between the columns of the openings 8. .

  FIG. 12B shows a cross section taken along the line BB in FIG. In FIG. 12B, a cross section of the partition 7 between the inner surface of the opening 8 (first row) corresponding to one surface of the partition 61 and the opening 8 is shown. In the figure, antireflection surfaces 62 and 63 are formed on the inner surface (one of the inner surfaces of the opening 8 other than the partition wall 7) corresponding to one surface of the partition wall 61 (in the first row).

  The inner surface of the opening 8 (in the first row) corresponding to one surface of the partition wall 61 shown in FIG. 12B is the mold surface 64 of the first and second core pins 30 and 31 shown in FIG. , 65. The mold surfaces 64 and 65 are roughened to form the antireflection surfaces 62 and 63 shown in FIG.

  The first and second core pins 30 and 31 in FIG. 12C have a mold profile substantially the same as that described in the first embodiment, and other molds configured in the same manner as in the first embodiment. Attached to the molding apparatus together with the mold part. The engaging surfaces of the tip portions of the first and second core pins 30 and 31 are configured in the same manner as described above, and an antireflection surface (14 described above) is provided on the mold surface 30s (and 31s) for molding the partition wall 7. The rough surface processing for forming is given.

  The first and second core pins 30 and 31 in FIG. 12C show only one surface of two sets that are engaged with each other. However, the same mold surfaces 64 and 65 as those shown on the front side are also formed on the opposite side so as to mold the inner surface of the opening 8 on the outer peripheral side of the light shielding member 202. With such a structure of the core pins 30 and 31, all four inner surfaces of the opening 8 are formed as antireflection surfaces (14, 62, 63).

  The inner surface of the opening 8 on the outer peripheral side of the light shielding member 202 is surrounded by a side wall portion on the outer periphery of the relatively thick light shielding member 202, and the core pins 30, 31 are provided even if the mold surface forming this surface is roughened. Concerns about breakage and deformation that occur during removal are likely not to be great. However, if the two rows of openings 8 are arranged adjacent to the light shielding member 202 at the smallest possible distance, the thickness of the partition wall 61 may be as small as the partition wall 7 (on the order of 0.1 mm). In that case, when roughening is performed on the mold surfaces 64 and 65 for molding the inner surface of the opening 8 on the inner peripheral side of the light shielding member 202 corresponding to one surface of the partition wall 61, the mold for molding the partition wall 7 described above is used. As in the case of the mold surface 30s (31s), it is necessary to consider the breakage and deformation of the partition wall 61.

  Therefore, in this embodiment, draft angles are provided on the mold surfaces 64 and 65 of the core pins 30 and 31. That is, the mold surfaces 64 and 65 in FIG. 12C are configured as inclined surfaces that fall toward the other side of the paper surface of the drawing as they approach the tips of the core pins 30 and 31. According to the overall structure of the mold as shown in the first embodiment, each core pin 30, 31 is linearly extracted in the longitudinal direction. Therefore, by providing the above draft, the mold surfaces 64 and 65 having the rough surface processing of FIG. 12C are smoothly released from the inner surface of the opening 8 in which the antireflection surfaces 62 and 63 are formed. It is possible to prevent the part of the partition wall 61 from being damaged or deformed.

  The draft angle of the mold surfaces 64 and 65 is such that the mold surface that molds the inner surface of the opening 8 on the outer peripheral side of the light shielding member 202 facing the mold surfaces 64 and 65 (this mold surface also has the same as described above. The same rough surface processing can be provided).

  The mold surface 30 s (31 s) forming the partition wall 7 has a draft structure when the core pins 30 and 31 are extracted by the mold structure as shown in the first embodiment, and the partition wall 7 is a light shielding member. It is molded without inclination so as to be orthogonal to the longitudinal direction of 202. However, with respect to the mold surfaces 64 and 65, by providing the above draft angle, the antireflection surfaces 62 and 63 of the partition wall 61 are connected to the optical axis (FIG. 12 (B)) via the boundary line 48 (FIG. 12 (B)). It is formed as an inclined surface in which the inclination angles with respect to the vertical direction A) are mutually inverted. As a result, the aperture efficiency in the short direction of the light shielding member 202 is reduced, but the influence on the optical characteristics can be reduced by designing the lens surface shape of the microlens array 1.

  However, in the configuration as shown in FIG. 12A, since the openings (apertures) 8 in the two rows are arranged in a staggered manner, the problem of breakage and deformation of the partition walls 61 when the mold is opened and light leakage to the adjacent rows May not be as serious as case 7. In addition, in the optical design, in the long solid exposure element array 4, the light irradiated from the solid exposure element 4 has a large amount of light applied to the partition wall 7 in the short direction, but the light amount applied to the partition wall 61 in the longitudinal direction. Tends to be trace amounts.

  If it is estimated that the amount of light irradiated toward the partition wall 61 is very small, the surface roughness of the rough surface processing of the mold surfaces 64 and 65 forming the diffusion surface of the partition wall 61 is about 10 μm RMS. There is a possibility that the optical characteristics of can be maintained. With this level of surface roughness, even if the draft angle of the die surfaces 64 and 65 (or the die surface of each core pin facing them) is about 1 ° with respect to the direction in which the core pins 30 and 31 are pulled out, the partition 61 The mold can be released without damage or deformation. In addition, the opening efficiency of the opening 8 can be saved without sacrificing much.

  As described above, the light-shielding member 202 having a plurality of rows of apertures that have good aperture efficiency, excellent recording light transmission characteristics, and can be used for high-resolution recording without causing breakage or deformation of the partition around the aperture (aperture). Can be molded.

(Variations, etc.)
Below, while showing a various modification, the detail of each member of the manufacturing apparatus of a light shielding member is supplementarily demonstrated. In the following, the structure of the first and second core pins 30 and 31 is exemplified by the shape shown in the first embodiment, but the structure shown below is the same as that shown in the second embodiment as long as no contradiction occurs. The structure of the first and second core pins 30 and 31 can also be implemented.

9A and 9B show a configuration example of the core pin 30 or the core pin 31 and the core member 41 or 42 that supports the core pin 30. FIG. FIG. 9A shows a perspective view of one of the core pins 30 or 31.
In order to form an antireflection surface (14 described above) on the partition wall 7, a rough surface processing 46 is applied to the mold surface (the above 30 s, 31 s: the same below) defining the partition wall (the above 7: the same below). . The rough surface processing 46 is performed by, for example, shot blasting, and the core pins 30 or 31 are separated from each other as shown in FIG. 9B, and are incorporated and supported by the core member 41 or 42 as a base. Thus, by making each of the core pins 30 or 31 separate, it is easy to apply the rough surface processing 46 to only one of the mold surfaces (30s, 31s) that define the partition wall (7). Become. In addition, by making each of the core pins 30 or 31 separate, when damage due to contact between the core pins occurs, it is possible to manufacture and replace only the damaged core pin piece, with minimal correspondence. The manufacturing apparatus of the light shielding member (2) can be restored.

  In addition, a material having high light shielding performance is used as the resin material to be filled for molding the light shielding member (2). For example, it is preferable to use a transparent lens material that is the same as the material used for the microlens array (1), with a black pigment or carbon added thereto. In this way, by making the basic composition the same as the material used for the microlens array (1), for example, the light shielding member (2) and the microlens array (1) can have the same expansion and contraction rates due to temperature changes. . Thereby, the fluctuation | variation of the performance of the solid exposure light emitting element unit by an environment can be suppressed.

  For example, if there is a difference in expansion / contraction rate between the light shielding member (2) and the microlens array (1) depending on the temperature or the like, the optical characteristics may be deteriorated such that the partition wall 7 of the light shielding member covers the lens surface 5. There is sex. However, for example, by using the same material for the light shielding member (2) and the microlens array (1), the lens pitch of the microlens array (1) and the aperture (8: aperture) of the light shielding member (2) regardless of environmental conditions. ) Pitch variation can be made substantially the same. Thereby, the optical characteristic deterioration as described above can be prevented.

  If the design maximum dimension of the partition wall (7) of the light shielding member (2) is, for example, 0.1 mm, if an antireflection surface (14) having an RMS of 20 μm is provided on both sides of the wall by transfer of the rough surface processing 46, The minimum thickness of the partition wall (7) is about 0.06 mm. The amount of black pigment or carbon added to ensure opacity is selected so that no light is transmitted even at such a thickness.

  DESCRIPTION OF SYMBOLS 1 ... Micro lens array 2, 202 ... Light-shielding member, 4 ... Solid exposure element array, 7 ... Partition, 8 ... Opening, 9 ... Solid exposure element, 14 ... Antireflection surface, 15 ... Cavity, 29 ... Restriction mold surface , 30s, 31s ... mold surface, 36 ... clearance, 39, 40 ... cavity mold, 56, 57 ... template, 58 ... core pin block, 61 ... partition wall, 62, 63 ... antireflection surface, 64, 65 ... gold Mold surface, 111, 112, 113 ... ejector pins.

Claims (20)

Production of a light shielding member in which a plurality of openings through which light beams pass through a partition wall are regularly arranged in a lattice shape in the longitudinal direction, and the adjacent openings are kept in a light shielding state by the partition wall, and are integrally formed In the device
A first cavity mold that defines a cavity corresponding to the outer shape of the light-shielding member in a state of being clamped and in contact with each other; and a second cavity mold;
A first core member in which the same number of first core pins as the openings are arranged in a comb shape so as to be inserted into the cavity from the outside of the first cavity mold through the first cavity mold. When,
A second core member in which the same number of second core pins as the openings are arranged in a comb shape so as to be inserted into the cavity through the second cavity mold from the outside of the second cavity mold And comprising
The adjacent first and second core pins inserted into the cavity are engaged and engaged with each other such that the first and second core pins together define one of the openings; A mold surface defining a partition wall,
Resin is filled in a space defined between the mold surfaces of the first and second core pins inserted into the cavity defined by closing the molds of the first and second cavities. Forming the light shielding member, and after cooling, the first and second core pins in the direction away from the partition wall through the first and second core members. An apparatus for manufacturing a light shielding member, wherein a core pin is removed.   2. The light shielding member manufacturing apparatus according to claim 1, wherein an outer shape of the light shielding member is defined on an inner side of the first and second cavity molds with respect to a direction perpendicular to an opening / closing direction of the molds. The first and second core pins are inserted or removed through the first and second core members in parallel with the opening and closing directions of the first and second cavity molds. The light-shielding member manufacturing apparatus is arranged as described above.   3. The light shielding member manufacturing apparatus according to claim 1, wherein after filling and cooling the resin, the first and second cavities are first closed from the cavity with the first and second cavity molds closed. The core pins are removed, and then the first and second core pins are removed by the first and second core members so that the first and second cavity molds are opened, and the first and second core members are removed. An apparatus for manufacturing a light shielding member, wherein an interlocking mechanism for interlocking the mold opening of the cavity mold is provided.   4. The light-shielding member manufacturing apparatus according to claim 1, wherein a rough surface process is performed on a die surface of the first and second core pins that defines the partition wall. An apparatus for manufacturing a light shielding member, wherein an inner surface of the partition wall is formed as an antireflection surface by a processed mold surface.   5. The light-shielding member manufacturing apparatus according to claim 1, wherein roughening is performed on a mold surface that defines an inner surface of the opening excluding the partition wall of the first and second core pins. An apparatus for manufacturing a light shielding member, characterized in that the inner surface of the opening excluding the partition is formed as an antireflection surface by the roughened mold surface.   6. The light-shielding member manufacturing apparatus according to claim 5, wherein a mold surface defining an inner surface of the opening excluding the partition walls of the first and second core pins is separated from the inner surface of the opening. An apparatus for manufacturing a light shielding member, wherein the second core pin is removed.   6. The light-shielding member manufacturing apparatus according to claim 1, further comprising a restriction mold surface that is opened and closed together with the first and second cavity molds, and the restriction mold surface defines the partition wall. An apparatus for manufacturing a light-shielding member, which defines end portions on both sides and abuts against both end portions on both sides of the partition wall when the first and second core pins are removed. .   8. The light shielding member manufacturing apparatus according to claim 7, wherein the regulation mold surface is integrally formed with the first and second cavity molds.   9. The light-shielding member manufacturing apparatus according to claim 1, wherein a plurality of the first or second core pins are integrally formed as a core pin block in units of the plurality of core pins, and the core pin block is An apparatus for manufacturing a light shielding member, which is attached to a first or second core member.   10. The light shielding member manufacturing apparatus according to claim 9, wherein a portion corresponding to at least a mold surface defining the partition wall of the first or second core pin integrally formed with the core pin block is formed by wire electric discharge machining. An apparatus for manufacturing a light shielding member. A plurality of openings through which light beams pass through the partition walls are regularly arranged in a lattice shape in the longitudinal direction, and a light shielding member in which the adjacent openings are kept in a light shielding state by the partition walls is integrally formed using a mold. In the manufacturing method of the light shielding member to
The mold includes a first cavity mold, a second cavity mold, and a first cavity mold that define a cavity corresponding to the outer shape of the light shielding member in a state where the mold is clamped and in contact with each other. A first core member in which the same number of first core pins as the openings are arranged in a comb shape so as to be inserted into the cavity through the first cavity mold from the outside, and the second cavity A second core member in which the same number of second core pins as the openings are arranged in a comb shape so as to be inserted into the cavity from the outside of the mold through the second cavity mold, And an engaging surface for engaging the first and second core pins adjacent to each other inserted into the cavity so that the first and second core pins define one of the openings as a whole. The above Includes a mold surface defining a wall, a,
Resin is filled in a space defined between the mold surfaces of the first and second core pins inserted into the cavity defined by closing the molds of the first and second cavities. Filling process;
After the resin is cooled, the first and second core pins are removed through the first and second core members so that the mold surfaces of the first and second core pins are separated from the partition walls. Process,
And a mold opening step of opening the first and second cavity molds after the extraction step.   12. The method for manufacturing a light shielding member according to claim 11, wherein an outer shape of the light shielding member is defined inside the first and second cavity molds by being inclined with respect to a direction orthogonal to an opening / closing direction of the molds. The first and second core pins are inserted or removed through the first and second core members in parallel with the opening and closing directions of the first and second cavity molds. The light-shielding member manufacturing method is characterized by being arranged as described above.   13. The method for manufacturing a light shielding member according to claim 11 or 12, wherein a surface of the mold defining the partition wall of the first and second core pins is subjected to roughening, and the roughened die is processed. A method of manufacturing a light shielding member, wherein an inner surface of the partition wall is formed as an antireflection surface by a surface.   14. The method of manufacturing a light shielding member according to claim 11, wherein roughening is performed on a mold surface that defines an inner surface of the opening excluding the partition wall of the first and second core pins. The manufacturing method of the light shielding member, wherein the inner surface of the opening excluding the partition is formed as an antireflection surface by the roughened mold surface.   15. The method of manufacturing a light shielding member according to claim 14, wherein a mold surface defining an inner surface of the opening excluding the partition walls of the first and second core pins is separated from the inner surface of the opening. A method for producing a light shielding member, wherein the second core pin is removed.   In the manufacturing method of the light-shielding member of any one of Claim 11 to 15, the edge part of the both sides of the said partition is used using the control mold surface opened and closed with the said 1st and 2nd cavity metal mold | die. A method for manufacturing a light shielding member, wherein the light shielding member is defined and the positions of the first and second core pins are abutted against both ends of the partition wall when the first and second core pins are removed.   17. The method for manufacturing a light shielding member according to claim 16, wherein the regulation mold surface is integrally formed with the first and second cavity molds.   The method of manufacturing a light shielding member according to any one of claims 11 to 17, wherein a plurality of the first or second core pins are integrally formed as a core pin block in units of the plurality of core pins, A method for manufacturing a light shielding member, wherein the light shielding member is attached to a first or second core member.   19. The method of manufacturing a light shielding member according to claim 18, wherein a portion corresponding to at least a mold surface defining the partition of the first or second core pin integrally formed with the core pin block is formed by wire electric discharge machining. A method for manufacturing a light shielding member.   A light shielding member produced by the method for producing a light shielding member according to claim 13 or 14, wherein an inner surface of the opening of the light shielding member is formed as an antireflection surface.

Images