WO2020110918A1 - Resin lens plate molding die - Google Patents

Resin lens plate molding die Download PDF

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Publication number
WO2020110918A1
WO2020110918A1 PCT/JP2019/045705 JP2019045705W WO2020110918A1 WO 2020110918 A1 WO2020110918 A1 WO 2020110918A1 JP 2019045705 W JP2019045705 W JP 2019045705W WO 2020110918 A1 WO2020110918 A1 WO 2020110918A1
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WO
WIPO (PCT)
Prior art keywords
resin
cavity
mold
lens
lens plate
Prior art date
Application number
PCT/JP2019/045705
Other languages
French (fr)
Japanese (ja)
Inventor
石川　大
Original Assignee
石川　大
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 石川　大 filed Critical 石川　大
Priority to JP2020557656A priority Critical patent/JP6925083B2/en
Publication of WO2020110918A1 publication Critical patent/WO2020110918A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/42—Moulds or cores; Details thereof or accessories therefor characterised by the shape of the moulding surface, e.g. ribs or grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds

Definitions

  • the present invention relates to a resin lens plate molding die, in particular, a resin lens plate molding die for forming a resin lens plate having a thin shape and a plurality of lenses molded in high definition by injection molding.
  • FIG. 8A is a top view illustrating a method for manufacturing the conventional resin lens plate 100.
  • FIG. 8B is a side view illustrating a method for manufacturing the conventional resin lens plate 100.
  • the resin lens plate 100 is formed by compressing and injecting a fluidized resin in a high temperature state into a cavity (not shown) of a molding die.
  • the resin lens plate 100 has a lens forming area 102 in which a plurality of lenses 101 are arranged in a matrix, and a lens assembly area 103 formed in an annular shape around the lens forming area 102.
  • the injection gate mark 105 is formed on the side surface 104 of the resin lens plate 100.
  • the resin injection gate is arranged in the arrangement area of the lens forming area 102 and covers the center of the cavity.
  • the resin injection gate is arranged to cover the center of the cavity even in the thickness direction of the resin lens plate 100 and has a thickness of about 1/3 of the resin lens plate 100. Has been formed.
  • the thickness T3 of the thickest lens forming region is, for example, about 1.5 mm, and the resin injected into the thin cavity is less likely to flow in the cavity. Then, as shown in FIGS. 8A and 8B, when the resin injection gate is made thin and small by giving priority to the cutout property of the injection gate trace 105, the corner of the cavity shown by the circle mark 106. In the part, there is a problem that an unfilled area is likely to occur.
  • the resin injection gate structure since the resin is filled in advance from the center side of the cavity close to the resin injection gate, the resin is not filled into the both end sides of the cavity such as the area indicated by the circle 106. I'll be late. In the region near the resin injection gate in the cavity, a large holding pressure at the time of filling the resin is applied for a long time until the filling of the resin in the entire cavity is completed.
  • FIG. 9A is a top view for explaining the resin lens plate 110 formed by the narrow resin injection gate 111.
  • FIG. 9B is an explanatory diagram in which the lens forming region of the resin lens plate 110 shown in FIG. 9A is enlarged.
  • the resin lens plate 110 has a resin injection gate 111 on the left side of the drawing, and the resin flows in a cavity (not shown) in the direction indicated by an arrow 114 and is filled. Then, the resin lens plate 110 is molded.
  • the area surrounded by the dotted line is the lens formation area 112, and the lens assembly area 113 is formed around the lens formation area 112.
  • the resin injection gate 111 is located in the placement area of the lens formation area 112 and is located in the center of the cavity. As described above, depending on the position of the resin injection gate 111, the resin is preliminarily filled from the center side of the cavity, as indicated by the alternate long and short dash line. As a result, in the region on both end sides of the cavity with respect to the filling direction of the resin, there is a problem in that the resin easily wraps around from the center side of the cavity and the resin merges easily, and welds easily occur.
  • FIG. 9B illustrates a situation in which a weld 116 is generated in the lens 115 in the lens forming area 112.
  • the weld 116 generated in each lens 115 adversely affects the floating image. It is considered that the weld 116 can avoid the occurrence by causing the resin to uniformly flow and fill the cavity, but there is a problem that it is difficult with the current shape of the molding die.
  • the present invention has been made in view of the above problems, and provides a resin lens plate molding die for forming by injection molding a resin lens plate having a thin shape and a plurality of lenses molded in high definition. To do.
  • a molding die for a resin lens plate of the present invention includes a first die and a second die, and a communication space between the first die and the second die is a runner. And a resin injection gate communicating with the runner, and a cavity communicating with the resin injection gate and molding a resin lens plate, wherein the cavity is at least a first main part.
  • the resin injection gate and the cavity are connected.
  • the opening width in the thickness direction between the mold surface of the first mold and the mold surface of the second mold of the opening is The opening width of the resin injection gate, which is wider than the center of the cavity toward both ends of the cavity and is perpendicular to the thickness direction, is the same as the lens formation region or wider than the lens formation region.
  • the runner communicates with the resin injection gate on an extension line of the center of the cavity.
  • the communication space communicates with the second side surface of the substantially hexahedron arranged to face the first side surface, and A discarding tab for discharging a part of the resin filled in the cavity to the outside of the cavity, wherein the discarding tab has at least a part of the lens forming region with the center of the cavity as the center of its opening region. It is characterized in that it is arranged over.
  • the molding die of the resin lens plate of the present invention in the cavity for molding the lens assembly region, at least the mold surface of the first mold or the mold surface of the second mold, A pair of resin flow paths that are linearly recessed from the resin injection gate side toward the discarding tab side are provided, and the resin flow path is provided wider than the lens forming region and communicates with the resin injection gate. It is characterized by doing.
  • the lens is molded on at least the die surface of the first die or the die surface of the second die in the lens forming region. Is formed with a plurality of hemispherical concave portions, and a flat area continuous to the lens assembly area is formed between the concave portions.
  • the flat region is roughened, and the recess is mirror-finished.
  • the opening width in the thickness direction between the die surface of the first die and the die surface of the second die in the cavity is It is characterized in that it extends from the center of the cavity toward both ends of the cavity.
  • a molding die for a resin lens plate of the present invention includes a first die and a second die, and a communication space between the first die and the second die is a runner and a runner. And a cavity for communicating with the resin injection gate and forming a resin lens plate.
  • the resin injection gate communicates with the first side surface, which is one of the four side surfaces of the substantially hexahedral cavity, and the opening of the resin injection gate at the boundary cross section between the resin injection gate and the cavity.
  • the opening width in the thickness direction of the opening is wider than the center of the cavity toward both ends of the cavity, and the opening width in the direction perpendicular to the thickness direction of the resin injection gate is the same width as the lens forming area or the lens forming area. Is wider than that.
  • the amount of resin injected from the resin injection gate into the cavity is made as uniform as possible, so that the resin lens plate is warped due to the difference in internal stress distribution to the resin, and uneven thickness It is prevented from occurring.
  • the resin lens plate can maintain high quality as an optical product.
  • the communication space has a discard tab for discharging a part of the resin filled in the cavity to the outside of the cavity.
  • a pair of resin flow paths that are linearly recessed from the resin injection gate side toward the discard tab side are provided in the cavity region for molding the lens assembly region. ing.
  • the holding pressure becomes weaker at both ends of the cavity than at the center side of the cavity, but by increasing the fluidity of the resin, it is possible to fill the entire cavity with the resin as uniformly as possible.
  • a plurality of hemispherical concave portions for molding a lens are formed on the die surface of the first die or the die surface of the second die.
  • a flat area that is continuous to the lens assembly area is formed between the recesses.
  • the flat area is roughened and the recess is mirror-finished.
  • a light blocking portion having an aperture stop function is formed in the lens forming region of the resin lens plate, and a high quality floating image can be realized.
  • the opening width in the thickness direction is widened toward both ends of the cavity rather than the center of the cavity.
  • the amount of resin injected from the gate into the cavity can be made as uniform as possible.
  • molding die 10 for a resin lens plate according to an embodiment of the present invention (hereinafter, referred to as “molding die 10”) will be described in detail with reference to the drawings.
  • molding die 10 a molding die 10 for a resin lens plate according to an embodiment of the present invention
  • FIG. 1A is a plan view illustrating a molding die 10 of this embodiment.
  • FIG. 1B is a plan view illustrating a mold surface 11A of the first mold 11 of the molding mold 10 according to this embodiment.
  • the mold surface 12A of the second mold 12 in the cavity 13 of the molding mold 10 has the same shape as the mold surface 11A of the first mold 11, and the second mold 12 (see FIG. 2). ), the description of the mold surface 12A (see FIG. 2) refers to the description of the mold surface 11A of the first mold 11, and the description thereof will be omitted.
  • the molding die 10 is mainly composed of a first die 11 and a second die 12.
  • the resin 31 flows in the first and second molds 11 and 12 when the first and second molds 11 and 12 contact each other.
  • the communication space 22 shown is formed.
  • the communication space 22 of the molding die 10 mainly includes a cavity 13 for molding the resin lens plate 41 (see FIG. 6A), a resin injection gate 14 for injecting the resin 31 into the cavity 13, and a resin injection gate.
  • a runner 15 communicating with 14 and a discard tab 16 communicating with the cavity 13 are formed.
  • the cavity 13 of the molding die 10 is a space of a substantially hexahedron
  • the resin injection gate 14 is disposed on the side surface of the cavity 13 on the front side of the paper surface
  • the discarding tab 16 is disposed on the side surface of the cavity 13 on the rear side of the paper surface. It is set up. Then, the resin 31 injected from the resin injection gate 14 fills the inside of the cavity 13 while flowing in the lateral direction of the cavity 13 (front-back direction of the paper).
  • the resin injection gate 14 is arranged in the longitudinal direction of the side surface of the cavity 13 on the front side of the paper surface (the left-right direction of the paper surface). Further, a communication point between the runner 15 and the resin injection gate 14 is arranged on an extension line of the center CL of the cavity 13 in the longitudinal direction (left and right direction of the paper).
  • the mold surface 11A of the first mold 11 is a processed surface 11B that forms the lens forming area 44, and a processed surface 11C that surrounds the processed surface 11B and forms the lens assembly area 45. And have. Then, on the processed surface 11B, hemispherical concave portions 11D for forming microlenses are arranged in a matrix at a predetermined pitch. Although details will be described later, in the present embodiment, a flat region 11E is formed on the processed surface 11B so as to surround the periphery of each recess 11D.
  • each minute lens 47 (see FIG. 6B) has a hemispherical shape, but may have an aspherical shape, for example, and has a circular shape or a hexagonal shape in a plan view. It may be a shape.
  • a pair of resin flow paths 17 are formed wider than the lens formation region 44 in the lateral direction of the cavity 13 (front-back direction on the paper surface).
  • the resin flow path 17 is a region for improving the flow of the resin 31 in the cavity 13, and a linear recess region 11F is formed on the processed surface 11C.
  • one end side of the recessed region 11F communicates with the resin injection gate 14.
  • the other end side of the recessed area 11F is located closer to the discarding tab 16 side (the rear side in the drawing) than the processed surface 11B of the lens forming area 44.
  • FIG. 2 is a cross-sectional view of the molding die 10 shown in FIG. 1(A) taken along the line AA, illustrating the resin injection gate 14 of the molding die 10.
  • the shape of the opening 14A of the resin injection gate 14 is shown in the boundary cross section in which the resin injection gate 14 communicates with the cavity 13 (see FIG. 1A).
  • the opening width W1 of the opening 14A in the lateral direction is formed so that both ends of the cavity 13 are wider than the center CL of the cavity 13.
  • the mold surface 11A of the first mold 11 is formed as a flat surface
  • the mold surface 12A of the second mold 12 is formed as an inclined surface with the center CL of the cavity 13 as the top.
  • the opening width W2 of the opening 14A in the longitudinal direction (left-right direction on the paper surface) is formed wider than the lens forming region 44. That is, the resin injection gate 14 is formed up to the outside of the lens formation region 44 in the longitudinal direction of the cavity 13 (left-right direction on the paper surface).
  • the runner 15 communicates with the resin injection gate 14 on an extension line of the center CL of the cavity 13. Then, the resin injection gate 14 communicates with the cavity 13 while gradually expanding the opening cross-sectional area of the shape shown in FIG.
  • the center CL of the cavity 13, which is the shortest distance from the runner 15, has a stronger holding pressure when the resin is filled, and the holding pressure gradually decreases toward both ends of the cavity 13.
  • the resin 31 (see FIG. 5(A)) is more vigorously injected into the cavity 13 toward the center CL of the cavity 13, and even within the cavity 13, the resin 31 precedes in the lateral direction of the cavity 13 (front-back direction of the paper). And it becomes easy to flow.
  • the opening width W1 of the opening portion 14A of the resin injection gate 14 is formed such that both end portions of the cavity 13 are wider than the center CL of the cavity 13. .
  • the flow cross-sectional area of the resin 31 increases toward both ends of the cavity 13, and even if the holding pressure at the time of resin filling becomes weak, the flowability of the resin 31 causes It is possible to supply the resin 31 to both ends of the cavity 13 as evenly as possible on the center CL side.
  • the resin injection gate 14 is formed up to the outside of the lens forming region 44 in the longitudinal direction of the cavity 13 (left-right direction on the paper surface).
  • FIG. 3 is a cross-sectional view of the molding die 10 shown in FIG. 1(A) taken along the line BB, and is a view for explaining the resin flow path 17 of the molding die 10.
  • the resin flow path 17 is formed in the lens assembly area 45 of the first and second molds 11 and 12. Then, the recessed regions 11F and 12F formed on the machined surfaces 11C and 12C of the first and second molds 11 and 12 are aligned with each other.
  • the space width W3 in the thickness direction (vertical direction of the paper surface) of the resin flow path 17 is, for example, 0.9 mm or more and 1.5 mm or less, and is equal to or wider than the space width W4 of the flat regions 11E and 12E of the lens forming region 44.
  • the space width W5 of the recesses 11D and 12D for lens molding is slightly narrower.
  • the resin flow path 17 of the cavity 13 has the runner 15 (see FIG. 1B) and the resin injection gate 14 (see FIG. 1B) in the cavity 13.
  • the holding pressure at the time of resin filling becomes weaker than the center CL of the cavity 13.
  • the linear resin flow path 17 is formed in the lateral direction of the cavity 13 (front-back direction of the paper surface), the filling speed in the lens assembly region 45 can be increased.
  • FIG. 4 is a cross-sectional view of the molding die 10 shown in FIG. 1A taken along the line CC, and is a view for explaining the discarding tab 16 of the molding die 10.
  • the discarding tab 16 is arranged on the side surface of the cavity 13 opposite to the side surface of the cavity 13 in which the resin injection gate 14 is arranged. Then, in the boundary cross section with the cavity 13 with which the discarding tab 16 communicates, the center of the opening region of the discarding tab 16 matches the center CL of the cavity 13, and the discarding tab 16 covers at least a part of the lens forming region 44. It is arranged to do.
  • the mold surface 11A of the first mold 11 is formed as a flat surface continuous with the cavity 13, and the mold surface 12A of the second mold 12 is uneven. It is formed in a shape.
  • a part of the resin 31 (see FIG. 5A) flowing in the lens forming region 44 of the cavity 13 flows into the discarding tab 16, and the lens forming region 44 of the resin lens plate 41 (see FIG. 6A).
  • a weld or the like that may occur in the cavity can be poured out of the cavity 13.
  • FIG. 5(A) to 5(C) are plan views for explaining the filling state of the resin 31 in the molding die 10 of the present embodiment
  • FIG. 5(D) is the molding die of the present embodiment
  • FIG. 4 is a cross-sectional view illustrating a filling state of resin 31 in the mold 10. 5(A) to 5(C), the molding die 10 is shown in a simplified manner for convenience of explanation.
  • liquid or semi-solid resin 31 melted in a pod (not shown) is injected into the cavity 13 from the resin injection gate 14 via the runner 15.
  • the resin 31 a cycloolefin polymer resin, a polycarbonate resin, or an acrylic resin is used.
  • the resin 31 is heated in the pod so that the temperature in the cavity 13 is 270 degrees or more and 290 degrees or less, and the injection speed into the cavity 13 is 20 mm/s or more and 50 mm/s or less. s or less, the holding pressure is adjusted to be 50 Mpa or more and 80 Mpa or less.
  • the resin 31 adjusted to the above resin molding conditions is injected from the resin injection gate 14 into the cavity 13. Then, as described with reference to FIGS. 1 and 2, the runner 15 communicates with the resin injection gate 14 at the center CL of the cavity 13.
  • the opening 14A of the resin injection gate 14 is formed so that the opening width W1 is wider at both ends of the cavity 13 than at the center CL of the cavity 13.
  • the amount of the resin 31 injected from the resin injection gate 14 into the cavity 13 is slightly smaller on both ends of the cavity 13 than on the center CL side of the cavity 13.
  • the pair of resin flow paths 17 are provided at both ends of the cavity 13, so that the fluidity of the resin 31 is also improved.
  • the resin 31 injected to the center CL side of the cavity 13 flows slightly ahead of the cavity 13 due to the holding pressure, but as shown in the figure, the resin 31 is discarded in the entire cavity 13. It flows toward the tab 16 side as evenly as possible.
  • the cavity 13 is filled with the resin 31.
  • the resin flow path 17 communicating with the resin injection gate 14 having a wide opening width W1 is provided on both end sides of the cavity 13.
  • the injection amount of the resin 31 on both ends of the cavity 13 is increased, and the fluidity of the resin 31 is further improved.
  • the resin 31 flows in the entire cavity 13 toward the discard tab 16 side as uniformly as possible.
  • at least the lens formation region 44 is filled with the resin 31 that flows in one direction (the front-back direction of the paper surface), so that a confluence due to the wraparound of the resin 31 in the cavity 13 is less likely to occur, and the resin lens plate The weld line is prevented from being formed in the lens forming region 44 of 41 (see FIG. 6A).
  • the resin 31 in the region where the weld is likely to occur can be poured out of the cavity 13.
  • the resin 31 in the region where the weld is likely to occur can be driven into the lens assembly region 45.
  • the occurrence of weld, warp, etc. in the lens forming region 44 of the resin lens plate 41 is prevented, and the resin lens plate 41 (see FIG. 6A) maintains high quality as an optical product.
  • the resin 31 flows through the entire cavity 13 as uniformly as possible to form a lens located on the center CL side of the cavity 13. It is prevented that the region 44 is filled first and then the regions on both ends of the cavity 13 are filled with a large delay.
  • This structure prevents a large holding pressure during resin filling from being applied to the region of the center CL of the cavity 13 near the resin injection gate 14 for a long time. As a result, it is possible to prevent the resin lens plate 41 from warping and uneven thickness due to the difference in the internal stress distribution to the resin 31. Then, the resin lens plate 41 can maintain high quality as an optical product.
  • the resin 31 flows through the thick portion of the resin lens plate 41 (see FIG. 6A), as shown by the arrow 33.
  • the recesses 11D and 12D provided in the first and second molds 11 and 12 are also filled.
  • flat regions 11E and 12E are formed in the first and second molds 11 and 12 so as to surround the recesses 11D and 12D, and the flat regions 11E and 12E are formed in the lens forming region 44. It is continuous like a mesh, and its end portion is continuous to the lens assembly region 45 (see FIG. 1B).
  • the radius of curvature of the recesses 11D and 12D is, for example, 0.4 mm or more and 0.6 mm or less, and the recesses 11D and 12D are formed in a matrix at a pitch of 0.3 mm or more and 0.5 mm or less. ing.
  • the protrusion shape in the boundary region between the recesses 11D, 12D and the flat regions 11E, 12E is eliminated, and the recesses 11D, 12D are removed. Becomes shallower.
  • FIG. 6A is a perspective view illustrating the resin lens plate 41 of this embodiment.
  • FIG. 6B is an enlarged cross-sectional view illustrating the resin lens plate 41 of this embodiment.
  • FIG. 6A shows the resin lens plate 41 immediately after being released from the molding die 10.
  • the resin lens plate 41 is a thin plate-shaped substantially hexahedral body. Then, in the first main surface 42 (see FIG. 6B) and the second main surface 43 of the resin lens plate 41, most of them are formed as the lens forming region 44 and surround the periphery of the lens forming region 44. Thus, the lens assembly area 45 is formed in an annular shape.
  • the lens assembly region 45 forms the outer peripheral end portion 46 of the resin lens plate 41.
  • the shape of the mold surface 11A (see FIG. 1B) of the first mold 11 (see FIG. 1B) is transferred to the first main surface 42, and the second main surface 42 is transferred.
  • the shape of the die surface 12A (see FIG. 2) of the second die 12 (see FIG. 2) is transferred.
  • a plurality of spherical lenses 47 are formed in a matrix on the first and second main surfaces 42, 43.
  • the resin lens plate 41 has a cured resin 48 cured in the shape of the resin injection gate 14 (see FIG. 1A) and a runner 15 (see FIG. 1).
  • a cured resin 49 cured in the shape of (A) and a cured resin 50 cured in the shape of the discard tab 16 (see FIG. 1A) are integrally formed.
  • FIG. 6B a part of the lens formation region 44 is shown in an enlarged manner.
  • the plurality of lenses 47 are formed in a matrix at a pitch of 0.3 mm or more and 0.5 mm or less, for example.
  • a flat region 51 is formed between the lenses 47.
  • a plurality of resin lenses is provided on the first and second main surfaces 42, 43 of the resin lens plate 41 so that the optical axes of the lenses 47 in the thickness direction (vertical direction on the paper surface) coincide with each other, as indicated by a chain line 52. Lens 47 is formed.
  • the thickness T1 of the formation region of the lens 47 is 1.2 mm ⁇ 0.5 mm, and the thickness T2 of the formation region of the flat region 51 is 1.1 mm ⁇ 0.5 mm, for example. It is formed by.
  • the radius of curvature of the lens 47 is, for example, 0.4 mm or more and 0.6 mm or less.
  • the flat area 51 is roughened as shown by the thick line, while the lens 47 is mirror-finished. Specifically, in the areas corresponding to the flat areas 11E and 12E of the mold surfaces 11A and 12A of the first and second molds 11 and 12, rough surface processing such as blasting, chemical etching or polishing is performed. Has been applied.
  • the two resin lens plates 41 are attached to each other by using the lens assembly area 45 in a state where the optical axes of the plurality of lenses 47 are aligned with each other, so that the resin erect lens array (not shown) is attached. ) Used as.
  • the flat region 51 having the roughened surface is formed, so that the transmitted light incident on the inside of the resin lens plate 41 from the regions other than the lens 47 region is transmitted to the flat region 51. Diffuse reflection is possible. That is, since the flat area 51 is used as a light blocking portion having an aperture stop function, a high quality floating image can be realized.
  • the molding die 60 has substantially the same structure as the molding die 10 described above with reference to FIGS. 1 to 4 except that the shape of the cavity 62 is different, and in the following description, The description of the molding die 10 and the resin lens plate 41 described with reference to FIGS. 1 to 6 will be appropriately referred to, the same reference numerals will be used for the same members in principle, and repeated description will be omitted.
  • FIG. 7(A) is a cross-sectional view illustrating the molding die 60 of the present embodiment, and shows a cross section taken along the line DD of the molding die 10 shown in FIG. 1(A).
  • FIG. 7B is an enlarged cross-sectional view illustrating a region indicated by a circle 63 of the molding die 60 of FIG. 7A.
  • the molding die 60 is mainly composed of a first die 11 and a second die 12, like the molding die 10.
  • the resin 31 flows in the first and second molds 11 and 12, and the dotted line 21 (see FIG. 1(A)
  • a communication space 22 (see FIG. 1(A)) is formed.
  • the communication space 22 of the molding die 60 mainly includes a cavity 62 for molding the resin lens plate 41 (see FIG. 6A) and a resin injection gate 14 for injecting the resin 31 into the cavity 62 (see FIG. )), a runner 15 (see FIG. 1A) that communicates with the resin injection gate 14, and a discard tab 16 (see FIG. 1A) that communicates with the cavity 62.
  • hemispherical concave portions 11D for forming microlenses are arranged in a matrix at a predetermined pitch on the mold surface 11A of the first mold 11 and the mold surface 12A of the second mold 12.
  • the alternate long and two short dashes lines 64 and 65 indicate the inclined lines of the mold surface 12A of the second mold 12, and the mold surface 12A of the second mold 12 has the same structure as the resin injection gate 14 described above.
  • the both ends of the cavity 62 are formed to be wider than the center CL of the cavity 62.
  • the mold surface 12A of the second mold 12 is formed as an inclined surface with the center CL of the cavity 62 as the apex.
  • the present embodiment is not limited to the case where the mold surface 12A of the second mold 12 is formed as an inclined surface.
  • the mold surface 12A of the second mold 12 is formed as an inclined surface.
  • the mold surface 11A of the first mold 11 is an inclined surface and the mold surface 12A of the second mold 12 is a flat surface (horizontal surface), or when the mold surface 11A of the first mold 11 and the second mold surface
  • the mold surface 12A of the mold 12 may be an inclined surface.
  • the inclination of the mold surface 12A of the second mold 12 is shown to be larger than it actually is, but in the second mold 12, the center CL of the cavity 62 is shown.
  • the depth of the recess 11D is deeper than on the end side of the cavity 62.
  • the space width W4 of the flat regions 11E and 12E between the recesses 11D of the cavity 62 is shorter on the center CL side of the cavity 62 than on the end side of the cavity 62.
  • the mold surface 11A of the first mold 11 is formed as a flat surface.
  • the flow cross-sectional area of the resin 31 increases toward both ends of the cavity 62, and even if the holding pressure at the time of resin filling becomes weak, the flowability of the resin 31 causes It is possible to supply the resin 31 to both ends of the cavity 62 as evenly as possible on the center CL side.
  • the mold surfaces 11A and 12A of the first and second molds 11 and 12 are formed.
  • the present invention is not limited to this case.
  • the mold surfaces 11A of the first and second molds 11 and 12 are formed. , 12A, a similar effect can be obtained even when a plurality of lens forming recesses 11D, 12D are formed.
  • the opening width W2 of the opening portion 14A of the resin injection gate 14 shown in FIG. 2 in the longitudinal direction has been described as being wider than the lens forming region 44, but this is not the only case. Not a thing.
  • the opening width W2 of the opening 14A may be the same as or slightly narrower than the lens forming region 44. That is, in the lens formation region 44, the weld line is prevented from being generated by the resin 31 on the center CL side of the cavity 13, and the resin 31 is filled into the resin 31 as uniformly as possible in the entire cavity 13. It suffices if the occurrence of a difference in internal stress distribution is prevented.
  • various modifications can be made without departing from the scope of the present invention.

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Abstract

Conventional resin lens plate molding dies have problems in that it is difficult for a cavity to be filled as uniformly as possible with resin, and it is thus difficult to mold a resin lens plate having high-quality optical characteristics. In a resin lens plate molding die 10 according to the present invention, a resin introduction gate 14 communicates over a wide width with a side surface of a cavity 13, and an opening width thereof is formed to become wider toward both end portions of the cavity 13 than at a center CL of the cavity 13. By means of this construction, resin 31 can be introduced as uniformly as possible into the cavity 13 from the resin introduction gate 14, and a difference in internal stress distribution to the resin 31 can be reduced significantly, and it is thus possible to mold a high-quality resin lens plate 41.

Description

樹脂レンズプレートの成形金型Mold for resin lens plate
　本発明は、樹脂レンズプレートの成形金型であり、特に、薄肉形状であり、且つ複数のレンズが高精細に成形された樹脂レンズプレートを射出成形により形成するための樹脂レンズプレートの成形金型に関する。 The present invention relates to a resin lens plate molding die, in particular, a resin lens plate molding die for forming a resin lens plate having a thin shape and a plurality of lenses molded in high definition by injection molding. Regarding
　従来の樹脂レンズプレート１００の製造方法として、図８（Ａ）及び図８（Ｂ）に示す製造方法が知られている。図８（Ａ）は、従来の樹脂レンズプレート１００の製造方法を説明する上面図である。図８（Ｂ）は、従来の樹脂レンズプレート１００の製造方法を説明する側面図である。 As a conventional method of manufacturing the resin lens plate 100, the manufacturing method shown in FIGS. 8(A) and 8(B) is known. FIG. 8A is a top view illustrating a method for manufacturing the conventional resin lens plate 100. FIG. 8B is a side view illustrating a method for manufacturing the conventional resin lens plate 100.
　図８（Ａ）に示す如く、樹脂レンズプレート１００は、成形金型のキャビティ（図示せず）内に高温状態の流動化した樹脂を圧縮注入することで形成される。そして、樹脂レンズプレート１００は、複数のレンズ１０１が行列状に配列されたレンズ形成領域１０２と、レンズ形成領域１０２の周囲に環状に形成されたレンズ組み立て領域１０３と、を有している。 As shown in FIG. 8A, the resin lens plate 100 is formed by compressing and injecting a fluidized resin in a high temperature state into a cavity (not shown) of a molding die. The resin lens plate 100 has a lens forming area 102 in which a plurality of lenses 101 are arranged in a matrix, and a lens assembly area 103 formed in an annular shape around the lens forming area 102.
　このとき、キャビティ内には、樹脂注入ゲート（図示せず）を介して樹脂が充填されるため、樹脂レンズプレート１００の側面１０４には、注入ゲート痕１０５が形成されている。そして、樹脂注入ゲートは、レンズ形成領域１０２の配置領域内であり、キャビティの中心部をカバーする様に配置されている。 At this time, since the cavity is filled with the resin through the resin injection gate (not shown), the injection gate mark 105 is formed on the side surface 104 of the resin lens plate 100. The resin injection gate is arranged in the arrangement area of the lens forming area 102 and covers the center of the cavity.
　図８（Ｂ）に示す如く、樹脂注入ゲートは、樹脂レンズプレート１００の厚み方向においても、キャビティの中心部をカバーして配置されると共に、樹脂レンズプレート１００の１／３程度の厚みにて形成されている。 As shown in FIG. 8B, the resin injection gate is arranged to cover the center of the cavity even in the thickness direction of the resin lens plate 100 and has a thickness of about 1/3 of the resin lens plate 100. Has been formed.
特許第４２３６４１８号公報Japanese Patent No. 4236418
　樹脂レンズプレート１００では、最も厚くなるレンズの形成領域の厚みＴ３が、例えば、１．５ｍｍ程度であり、薄いキャビティ内に注入された樹脂は、キャビティ内を流動し難くなる。そして、図８（Ａ）及び図８（Ｂ）に示すように、注入ゲート痕１０５の切欠き性を優先させ、樹脂注入ゲートを薄く、且つ、小さくすると、丸印１０６にて示すキャビティのコーナー部では、未充填領域が発生し易いという課題がある。 In the resin lens plate 100, the thickness T3 of the thickest lens forming region is, for example, about 1.5 mm, and the resin injected into the thin cavity is less likely to flow in the cavity. Then, as shown in FIGS. 8A and 8B, when the resin injection gate is made thin and small by giving priority to the cutout property of the injection gate trace 105, the corner of the cavity shown by the circle mark 106. In the part, there is a problem that an unfilled area is likely to occur.
　また、上記樹脂注入ゲート構造では、樹脂注入ゲートに近いキャビティの中心部側から先行して樹脂が充填されるため、丸印１０６にて示す領域等、キャビティの両端部側への樹脂の充填が遅れてしまう。そして、キャビティ内の樹脂注入ゲートに近い領域では、キャビティ全体の樹脂の充填が完了するまでの間、樹脂充填時の大きな保圧力が長い時間加わることとなる。 Further, in the above resin injection gate structure, since the resin is filled in advance from the center side of the cavity close to the resin injection gate, the resin is not filled into the both end sides of the cavity such as the area indicated by the circle 106. I'll be late. In the region near the resin injection gate in the cavity, a large holding pressure at the time of filling the resin is applied for a long time until the filling of the resin in the entire cavity is completed.
　その結果、キャビティの中心部側と両端部側等では、樹脂に加わる内部応力分布差が大きくなり、樹脂レンズプレート１００に反りが発生したり、偏肉が発生したりする恐れがある。特に、上記反り等が、レンズ形成領域１０２に発生した場合には、複屈折により映像に乱れを発生させるという課題がある。 As a result, the difference in the distribution of internal stress applied to the resin between the center side and the both end sides of the cavity becomes large, which may cause warpage or uneven thickness of the resin lens plate 100. In particular, when the warp or the like occurs in the lens formation region 102, there is a problem that the image is disturbed by birefringence.
　更には、図９（Ａ）は、狭い樹脂注入ゲート１１１により成形された樹脂レンズプレート１１０を説明する上面図である。図９（Ｂ）は、図９（Ａ）に示す樹脂レンズプレート１１０のレンズ形成領域を拡大した説明図である。 Further, FIG. 9A is a top view for explaining the resin lens plate 110 formed by the narrow resin injection gate 111. FIG. 9B is an explanatory diagram in which the lens forming region of the resin lens plate 110 shown in FIG. 9A is enlarged.
　図９（Ａ）に示す如く、樹脂レンズプレート１１０は、紙面左側に樹脂注入ゲート１１１を有し、樹脂が矢印１１４にて示す方向にキャビティ（図示せず）内を流動し、充填されることで、樹脂レンズプレート１１０が成形される。そして、点線にて囲まれた領域がレンズ形成領域１１２であり、レンズ形成領域１１２の周囲にはレンズ組み立て領域１１３が形成されている。 As shown in FIG. 9(A), the resin lens plate 110 has a resin injection gate 111 on the left side of the drawing, and the resin flows in a cavity (not shown) in the direction indicated by an arrow 114 and is filled. Then, the resin lens plate 110 is molded. The area surrounded by the dotted line is the lens formation area 112, and the lens assembly area 113 is formed around the lens formation area 112.
　樹脂注入ゲート１１１は、レンズ形成領域１１２の配置領域内であり、キャビティの中心部に配置されている。上述したように、この樹脂注入ゲート１１１の位置により、一点鎖線にて示すように、樹脂はキャビティの中心部側から先行して充填される。その結果、樹脂の充填方向に対して、キャビティの両端部側の領域では、キャビティの中心部側からも樹脂が廻り込み、樹脂が合流する領域となり易く、ウェルドが発生し易いという課題がある。 The resin injection gate 111 is located in the placement area of the lens formation area 112 and is located in the center of the cavity. As described above, depending on the position of the resin injection gate 111, the resin is preliminarily filled from the center side of the cavity, as indicated by the alternate long and short dash line. As a result, in the region on both end sides of the cavity with respect to the filling direction of the resin, there is a problem in that the resin easily wraps around from the center side of the cavity and the resin merges easily, and welds easily occur.
　また、レンズ形成領域１１２の隣接するレンズ１１５同士が連続する形状では、樹脂が、型面の半球状の凹部にてキャビティ内のエアーを巻き込み易くなり、ウェルドが発生し易いという課題がある。また、個々のレンズ１１５同士の連続する領域では、矢印１１４にて示す樹脂の流動方向の後端部側にて、乱流が起り易く、個々のレンズ１１５にウェルド１１６が発生し易いという課題がある。 Further, in the shape in which the adjacent lenses 115 in the lens forming region 112 are continuous, there is a problem that the resin easily entraps air in the cavity in the hemispherical concave portion of the mold surface, and welds easily occur. Further, in a continuous region of the individual lenses 115, turbulent flow is likely to occur on the rear end side of the resin flow direction indicated by the arrow 114, and the weld 116 is likely to occur in the individual lenses 115. is there.
　図９（Ｂ）では、レンズ形成領域１１２のレンズ１１５にウェルド１１６が発生している状況を図示している。個々のレンズ１１５にウェルド１１６が発生することで、浮遊映像に悪影響を及ぼしてしまう。そして、ウェルド１１６は、樹脂をキャビティ内に均一に流動させ、充填することで、その発生を回避出来ると考えらえるが、現状の成形金型の形状では難しいという課題がある。 FIG. 9B illustrates a situation in which a weld 116 is generated in the lens 115 in the lens forming area 112. The weld 116 generated in each lens 115 adversely affects the floating image. It is considered that the weld 116 can avoid the occurrence by causing the resin to uniformly flow and fill the cavity, but there is a problem that it is difficult with the current shape of the molding die.
　本願発明は上記課題を鑑みてなされたものであり、薄肉形状であり、且つ複数のレンズが高精細に成形された樹脂レンズプレートを射出成形により形成するための樹脂レンズプレートの成形金型を提供することにある。 The present invention has been made in view of the above problems, and provides a resin lens plate molding die for forming by injection molding a resin lens plate having a thin shape and a plurality of lenses molded in high definition. To do.
　本発明の樹脂レンズプレートの成形金型では、第１の金型と第２の金型とを備え、前記第１の金型と前記第２の金型との間の連通空間は、ランナーと、前記ランナーと連通する樹脂注入ゲートと、前記樹脂注入ゲートと連通し、樹脂レンズプレートを成形するキャビティと、を有する樹脂レンズプレートの成形金型であって、前記キャビティは、少なくとも第１の主面または前記第１の主面と反対面の第２の主面に複数のレンズが行列状に形成されるレンズ形成領域と、前記レンズ形成領域の周囲に環状に形成されるレンズ組み立て領域と、を有する前記樹脂レンズプレートを成形する略６面体の空間であり、前記樹脂注入ゲートは、前記第１の主面を成形する前記第１の金型の型面と、前記第２の主面を成形する前記第２の金型の型面との間であり、前記略６面体の４つの側面のいずれか１つである第１の側面に対して連通し、前記樹脂注入ゲートと前記キャビティとの境界断面における前記樹脂注入ゲートの開口部において、前記開口部の前記第１の金型の前記型面と前記第２の金型の前記型面との間の厚み方向の開口幅は、前記キャビティの中心よりも前記キャビティの両端部に向けて広がり、前記樹脂注入ゲートの前記厚み方向に対して垂直方向の開口幅は、前記レンズ形成領域と同じ幅または前記レンズ形成領域よりも幅広く設けられ、前記ランナーは、前記キャビティの中心の延長線上にて前記樹脂注入ゲートと連通していることを特徴とする。 A molding die for a resin lens plate of the present invention includes a first die and a second die, and a communication space between the first die and the second die is a runner. And a resin injection gate communicating with the runner, and a cavity communicating with the resin injection gate and molding a resin lens plate, wherein the cavity is at least a first main part. A lens forming area in which a plurality of lenses are formed in a matrix on a surface or a second main surface opposite to the first main surface, and a lens assembly area formed in an annular shape around the lens forming area, Is a space of a substantially hexahedron for molding the resin lens plate, and the resin injection gate includes a mold surface of the first mold for molding the first main surface and a second main surface. Between the mold surface of the second mold to be molded and in communication with the first side surface, which is one of the four side surfaces of the substantially hexahedron, the resin injection gate and the cavity are connected. In the opening of the resin injection gate in the boundary cross section of, the opening width in the thickness direction between the mold surface of the first mold and the mold surface of the second mold of the opening is The opening width of the resin injection gate, which is wider than the center of the cavity toward both ends of the cavity and is perpendicular to the thickness direction, is the same as the lens formation region or wider than the lens formation region. The runner communicates with the resin injection gate on an extension line of the center of the cavity.
　また、本発明の樹脂レンズプレートの成形金型では、前記連通空間は、前記第１の側面と対向して配設される前記略６面体の第２の側面に対して連通し、前記キャビティ内に充填された樹脂の一部を前記キャビティ外へと排出するための捨てタブと、を有し、前記捨てタブは、前記キャビティの中心をその開口領域のセンターとして少なくとも前記レンズ形成領域の一部に渡り配設されていることを特徴とする。 Further, in the molding die of the resin lens plate of the present invention, the communication space communicates with the second side surface of the substantially hexahedron arranged to face the first side surface, and A discarding tab for discharging a part of the resin filled in the cavity to the outside of the cavity, wherein the discarding tab has at least a part of the lens forming region with the center of the cavity as the center of its opening region. It is characterized in that it is arranged over.
　また、本発明の樹脂レンズプレートの成形金型では、前記レンズ組み立て領域を成形する前記キャビティには、少なくとも前記第１の金型の前記型面または前記第２の金型の前記型面に、前記樹脂注入ゲート側から前記捨てタブ側に向けて直線状に窪んだ一対の樹脂流動経路が設けられ、前記樹脂流動経路は、前記レンズ形成領域よりも幅広く設けられると共に、前記樹脂注入ゲートと連通していることを特徴とする。 Further, in the molding die of the resin lens plate of the present invention, in the cavity for molding the lens assembly region, at least the mold surface of the first mold or the mold surface of the second mold, A pair of resin flow paths that are linearly recessed from the resin injection gate side toward the discarding tab side are provided, and the resin flow path is provided wider than the lens forming region and communicates with the resin injection gate. It is characterized by doing.
　また、本発明の樹脂レンズプレートの成形金型では、少なくとも前記レンズ形成領域の前記第１の金型の前記型面または前記第２の金型の前記型面には、前記レンズを成形するための複数の半球形状の凹部が形成されると共に、各前記凹部間には前記レンズ組み立て領域まで連続した平坦領域が形成されていることを特徴とする。 Further, in the molding die of the resin lens plate of the present invention, the lens is molded on at least the die surface of the first die or the die surface of the second die in the lens forming region. Is formed with a plurality of hemispherical concave portions, and a flat area continuous to the lens assembly area is formed between the concave portions.
　また、本発明の樹脂レンズプレートの成形金型では、前記平坦領域は粗面加工され、前記凹部は鏡面加工されていることを特徴とする。 Further, in the molding die of the resin lens plate of the present invention, the flat region is roughened, and the recess is mirror-finished.
　また、本発明の樹脂レンズプレートの成形金型では、前記キャビティにおける前記第１の金型の前記型面と前記第２の金型の前記型面との間の厚み方向の開口幅は、前記キャビティの中心よりも前記キャビティの両端部に向けて広がっていることを特徴とする。 Further, in the molding die of the resin lens plate of the present invention, the opening width in the thickness direction between the die surface of the first die and the die surface of the second die in the cavity is It is characterized in that it extends from the center of the cavity toward both ends of the cavity.
　本発明の樹脂レンズプレートの成形金型では、第１の金型と第２の金型とを備え、第１の金型と第２の金型との間の連通空間は、ランナーと、ランナーと連通する樹脂注入ゲートと、樹脂注入ゲートと連通し、樹脂レンズプレートを成形するキャビティと、を有している。そして、樹樹脂注入ゲートは、略６面体のキャビティの４つの側面のいずれか１つである第１の側面に対して連通し、樹脂注入ゲートとキャビティとの境界断面における樹脂注入ゲートの開口部において、開口部の厚み方向の開口幅は、キャビティの中心よりもキャビティの両端部に向けて広がり、樹脂注入ゲートの厚み方向と垂直方向の開口幅は、レンズ形成領域と同じ幅またはレンズ形成領域よりも幅広く設けられている。この構造により、樹脂注入ゲートからキャビティ内へと注入される樹脂の量が出来る限り均一化することで、樹脂への内部応力分布差により、樹脂レンズプレートに反りが発生し、また、偏肉が発生したりすることが防止される。そして、樹脂レンズプレートが、光学製品としての高品質性を維持することができる。 A molding die for a resin lens plate of the present invention includes a first die and a second die, and a communication space between the first die and the second die is a runner and a runner. And a cavity for communicating with the resin injection gate and forming a resin lens plate. The resin injection gate communicates with the first side surface, which is one of the four side surfaces of the substantially hexahedral cavity, and the opening of the resin injection gate at the boundary cross section between the resin injection gate and the cavity. In, the opening width in the thickness direction of the opening is wider than the center of the cavity toward both ends of the cavity, and the opening width in the direction perpendicular to the thickness direction of the resin injection gate is the same width as the lens forming area or the lens forming area. Is wider than that. With this structure, the amount of resin injected from the resin injection gate into the cavity is made as uniform as possible, so that the resin lens plate is warped due to the difference in internal stress distribution to the resin, and uneven thickness It is prevented from occurring. The resin lens plate can maintain high quality as an optical product.
　また、本発明の樹脂レンズプレートの成形金型では、上記連通空間は、キャビティ内に充填された樹脂の一部をキャビティ外へと排出するための捨てタブと、を有している。この構造により、最初にキャビティ内に注入されることで、キャビティ内の空気を巻き込み易く、また、温度低下等により、ウェルドが発生し易い樹脂をキャビティ外部へと排出することができる。 Further, in the molding die for the resin lens plate of the present invention, the communication space has a discard tab for discharging a part of the resin filled in the cavity to the outside of the cavity. With this structure, when the air is first injected into the cavity, the air in the cavity is easily entrained, and the resin in which the weld is likely to be generated due to the temperature decrease or the like can be discharged to the outside of the cavity.
　また、本発明の樹脂レンズプレートの成形金型では、レンズ組み立て領域を成形するキャビティの領域には、樹脂注入ゲート側から捨てタブ側に向けて直線状に窪んだ一対の樹脂流動経路が設けられている。この構造により、キャビティの両端部では、キャビティの中心側より保圧力が弱くなるが、樹脂の流動性を高めることで、キャビティ全体に樹脂を出来る限り均一に充填することができる。 Further, in the molding die for the resin lens plate of the present invention, a pair of resin flow paths that are linearly recessed from the resin injection gate side toward the discard tab side are provided in the cavity region for molding the lens assembly region. ing. With this structure, the holding pressure becomes weaker at both ends of the cavity than at the center side of the cavity, but by increasing the fluidity of the resin, it is possible to fill the entire cavity with the resin as uniformly as possible.
　また、本発明の樹脂レンズプレートの成形金型では、第１の金型の型面または第２の金型の型面には、レンズを成形するための複数の半球形状の凹部が形成されると共に、各凹部間にはレンズ組み立て領域まで連続した平坦領域が形成されている。この構造により、樹脂充填時に、樹脂の流動方向におけるレンズの後端部にて、樹脂の流れに乱流が発生し難く、個々のレンズにウェルドが発生することが防止される。 Further, in the molding die of the resin lens plate of the present invention, a plurality of hemispherical concave portions for molding a lens are formed on the die surface of the first die or the die surface of the second die. At the same time, a flat area that is continuous to the lens assembly area is formed between the recesses. With this structure, turbulence is unlikely to occur in the resin flow at the rear end of the lens in the resin flow direction when the resin is filled, and welds are prevented from occurring in the individual lenses.
　また、本発明の樹脂レンズプレートの成形金型では、上記平坦領域は粗面加工され、凹部は鏡面加工されている。この構造により、樹脂レンズプレートのレンズ形成領域には、開口絞り機能を有する遮光部が形成され、高品質の浮遊映像を実現することができる。 Further, in the molding die for the resin lens plate of the present invention, the flat area is roughened and the recess is mirror-finished. With this structure, a light blocking portion having an aperture stop function is formed in the lens forming region of the resin lens plate, and a high quality floating image can be realized.
　また、本発明の樹脂レンズプレートの成形金型では、樹脂注入ゲートに続きキャビティ内においても、その厚み方向の開口幅が、キャビティの中心よりもキャビティの両端部に向けて広がることで、樹脂注入ゲートからキャビティ内へと注入される樹脂の量が出来る限り均一化することができる。 In addition, in the molding die for the resin lens plate of the present invention, even in the cavity following the resin injection gate, the opening width in the thickness direction is widened toward both ends of the cavity rather than the center of the cavity. The amount of resin injected from the gate into the cavity can be made as uniform as possible.
本発明の一実施形態に係る樹脂レンズプレートの成形金型を説明する（Ａ）平面図、（Ｂ）平面図である。It is a (A) top view and a (B) top view explaining a metallic mold of a resin lens plate concerning one embodiment of the present invention. 本発明の一実施形態に係る樹脂レンズプレートの成形金型を説明する断面図である。It is sectional drawing explaining the molding die of the resin lens plate which concerns on one Embodiment of this invention. 本発明の一実施形態に係る樹脂レンズプレートの成形金型を説明する断面図である。It is sectional drawing explaining the molding die of the resin lens plate which concerns on one Embodiment of this invention. 本発明の一実施形態に係る樹脂レンズプレートの成形金型を説明する断面図である。It is sectional drawing explaining the molding die of the resin lens plate which concerns on one Embodiment of this invention. 本発明の一実施形態に係る樹脂レンズプレートの成形金型への樹脂の充填状況を説明する（Ａ）平面図、（Ｂ）平面図、（Ｃ）平面図、（Ｄ）断面図である。It is a (A) top view, a (B) top view, a (C) top view, and a (D) sectional view explaining the filling situation of resin into the metallic mold of the resin lens plate concerning one embodiment of the present invention. 本発明の他の実施形態に係る樹脂レンズプレートを説明する（Ａ）斜視図、（Ｂ）断面図である。It is a (A) perspective view and a (B) sectional view explaining the resin lens plate concerning other embodiments of the present invention. 本発明の他の実施形態に係る樹脂レンズプレートの成型金型を説明する（Ａ）断面図、（Ｂ）断面図である。It is (A) sectional drawing explaining the molding die of the resin lens plate which concerns on other embodiment of this invention, (B) sectional drawing. 従来の樹脂レンズプレートの製造方法を説明する（Ａ）上面図、（Ｂ）側面図である。It is (A) top view and (B) side view explaining the manufacturing method of the conventional resin lens plate. 従来の樹脂レンズプレートを説明する（Ａ）上面図、（Ｂ）拡大説明図である。It is a (A) top view explaining the conventional resin lens plate, and (B) enlarged explanatory view.
　以下、本発明の一実施形態に係る樹脂レンズプレートの成形金型１０（以下、「成形金型１０」と呼ぶ。）を図面に基づき詳細に説明する。尚、以下の説明では、同一の部材には原則として同一の符番を用い、繰り返しの説明は省略する。 Hereinafter, a molding die 10 for a resin lens plate according to an embodiment of the present invention (hereinafter, referred to as “molding die 10”) will be described in detail with reference to the drawings. In the following description, the same reference numerals will be used for the same members in principle, and repeated description will be omitted.
　図１（Ａ）は、本実施形態の成形金型１０を説明する平面図である。図１（Ｂ）は、本実施形態の成形金型１０の第１の金型１１の型面１１Ａを説明する平面図である。尚、成形金型１０のキャビティ１３内における第２の金型１２の型面１２Ａは、第１の金型１１の型面１１Ａと同一の形状であり、第２の金型１２（図２参照）の型面１２Ａ（図２参照）の説明は、第１の金型１１の型面１１Ａの説明を参照し、その説明を省略する。 FIG. 1A is a plan view illustrating a molding die 10 of this embodiment. FIG. 1B is a plan view illustrating a mold surface 11A of the first mold 11 of the molding mold 10 according to this embodiment. The mold surface 12A of the second mold 12 in the cavity 13 of the molding mold 10 has the same shape as the mold surface 11A of the first mold 11, and the second mold 12 (see FIG. 2). ), the description of the mold surface 12A (see FIG. 2) refers to the description of the mold surface 11A of the first mold 11, and the description thereof will be omitted.
　図１（Ａ）に示す如く、成形金型１０は、主に、第１の金型１１と第２の金型１２とから構成される。第１及び第２の金型１１、１２が当接することで、第１及び第２の金型１１、１２内には、樹脂３１（図５（Ａ）参照）が流動する、点線２１にて示す連通空間２２が形成されている。成形金型１０の連通空間２２には、主に、樹脂レンズプレート４１（図６（Ａ）参照）を成形するキャビティ１３と、キャビティ１３へ樹脂３１を注入する樹脂注入ゲート１４と、樹脂注入ゲート１４と連通するランナー１５と、キャビティ１３と連通する捨てタブ１６と、が形成されている。 As shown in FIG. 1(A), the molding die 10 is mainly composed of a first die 11 and a second die 12. At the dotted line 21, the resin 31 (see FIG. 5(A)) flows in the first and second molds 11 and 12 when the first and second molds 11 and 12 contact each other. The communication space 22 shown is formed. The communication space 22 of the molding die 10 mainly includes a cavity 13 for molding the resin lens plate 41 (see FIG. 6A), a resin injection gate 14 for injecting the resin 31 into the cavity 13, and a resin injection gate. A runner 15 communicating with 14 and a discard tab 16 communicating with the cavity 13 are formed.
　成形金型１０のキャビティ１３は、略６面体の空間であり、キャビティ１３の紙面前方側の側面に樹脂注入ゲート１４が配設され、キャビティ１３の紙面後方側の側面には捨てタブ１６が配設されている。そして、樹脂注入ゲート１４から注入された樹脂３１は、キャビティ１３の短手方向（紙面前後方向）に流動しながら、キャビティ１３内を充填する。 The cavity 13 of the molding die 10 is a space of a substantially hexahedron, the resin injection gate 14 is disposed on the side surface of the cavity 13 on the front side of the paper surface, and the discarding tab 16 is disposed on the side surface of the cavity 13 on the rear side of the paper surface. It is set up. Then, the resin 31 injected from the resin injection gate 14 fills the inside of the cavity 13 while flowing in the lateral direction of the cavity 13 (front-back direction of the paper).
　樹脂注入ゲート１４は、キャビティ１３の紙面前方側の側面の長手方向（紙面左右方向）に渡り配設されている。そして、ランナー１５と樹脂注入ゲート１４との連通箇所が、キャビティ１３の長手方向（紙面左右方向）の中心ＣＬの延長線上に配設されている。 The resin injection gate 14 is arranged in the longitudinal direction of the side surface of the cavity 13 on the front side of the paper surface (the left-right direction of the paper surface). Further, a communication point between the runner 15 and the resin injection gate 14 is arranged on an extension line of the center CL of the cavity 13 in the longitudinal direction (left and right direction of the paper).
　図１（Ｂ）に示す如く、第１の金型１１の型面１１Ａは、レンズ形成領域４４を形成する加工面１１Ｂと、その加工面１１Ｂを囲み、レンズ組み立て領域４５を形成する加工面１１Ｃと、を有している。そして、加工面１１Ｂには、半球形状の微小レンズ成形用の凹部１１Ｄが所定のピッチにて行列状に配列されている。詳細は後述するが、本実施の形態では、加工面１１Ｂには、各凹部１１Ｄの周囲を囲むように平坦領域１１Ｅが形成されている。尚、本実施の形態では、各微小のレンズ４７（図６（Ｂ）参照）は、半球形状であるが、例えば、非球面形状の場合でも良く、平面視において、例えば、円形状、６角形形状の場合でも良い。 As shown in FIG. 1B, the mold surface 11A of the first mold 11 is a processed surface 11B that forms the lens forming area 44, and a processed surface 11C that surrounds the processed surface 11B and forms the lens assembly area 45. And have. Then, on the processed surface 11B, hemispherical concave portions 11D for forming microlenses are arranged in a matrix at a predetermined pitch. Although details will be described later, in the present embodiment, a flat region 11E is formed on the processed surface 11B so as to surround the periphery of each recess 11D. In addition, in the present embodiment, each minute lens 47 (see FIG. 6B) has a hemispherical shape, but may have an aspherical shape, for example, and has a circular shape or a hexagonal shape in a plan view. It may be a shape.
　また、レンズ組み立て領域４５には、キャビティ１３の短手方向（紙面前後方向）に、一対の樹脂流動経路１７（図３参照）が、レンズ形成領域４４よりも幅広く形成されている。樹脂流動経路１７は、キャビティ１３内の樹脂３１の流れを良くするための領域であり、加工面１１Ｃには、直線状の窪み領域１１Ｆが形成されている。そして、窪み領域１１Ｆの一端側は、樹脂注入ゲート１４と連通している。一方、窪み領域１１Ｆの他端側は、レンズ形成領域４４の加工面１１Ｂよりも捨てタブ１６側（紙面後方側）に位置している。 Further, in the lens assembly region 45, a pair of resin flow paths 17 (see FIG. 3) are formed wider than the lens formation region 44 in the lateral direction of the cavity 13 (front-back direction on the paper surface). The resin flow path 17 is a region for improving the flow of the resin 31 in the cavity 13, and a linear recess region 11F is formed on the processed surface 11C. Then, one end side of the recessed region 11F communicates with the resin injection gate 14. On the other hand, the other end side of the recessed area 11F is located closer to the discarding tab 16 side (the rear side in the drawing) than the processed surface 11B of the lens forming area 44.
　図２は、図１（Ａ）に示す成形金型１０のＡ－Ａ線方向の断面図であり、成形金型１０の樹脂注入ゲート１４を説明する図である。 FIG. 2 is a cross-sectional view of the molding die 10 shown in FIG. 1(A) taken along the line AA, illustrating the resin injection gate 14 of the molding die 10.
　図２では、樹脂注入ゲート１４がキャビティ１３（図１（Ａ）参照）と連通する境界断面において、樹脂注入ゲート１４の開口部１４Ａの形状を示している。図示したように、開口部１４Ａの短手方向（紙面上下方向）の開口幅Ｗ１は、キャビティ１３の中心ＣＬよりもキャビティ１３の両端部の方が広くなるように形成されている。具体的には、第１の金型１１の型面１１Ａは平坦面として形成され、第２の金型１２の型面１２Ａはキャビティ１３の中心ＣＬを頂部とした傾斜面として形成されている。 In FIG. 2, the shape of the opening 14A of the resin injection gate 14 is shown in the boundary cross section in which the resin injection gate 14 communicates with the cavity 13 (see FIG. 1A). As shown in the drawing, the opening width W1 of the opening 14A in the lateral direction (vertical direction on the paper surface) is formed so that both ends of the cavity 13 are wider than the center CL of the cavity 13. Specifically, the mold surface 11A of the first mold 11 is formed as a flat surface, and the mold surface 12A of the second mold 12 is formed as an inclined surface with the center CL of the cavity 13 as the top.
　また、開口部１４Ａの長手方向（紙面左右方向）の開口幅Ｗ２は、レンズ形成領域４４よりも幅広く形成されている。つまり、樹脂注入ゲート１４は、キャビティ１３の長手方向（紙面左右方向）において、レンズ形成領域４４の外側まで形成されている。 The opening width W2 of the opening 14A in the longitudinal direction (left-right direction on the paper surface) is formed wider than the lens forming region 44. That is, the resin injection gate 14 is formed up to the outside of the lens formation region 44 in the longitudinal direction of the cavity 13 (left-right direction on the paper surface).
　ここで、図１（Ｂ）に示す如く、ランナー１５は、キャビティ１３の中心ＣＬの延長線上にて樹脂注入ゲート１４と連通する。そして、樹脂注入ゲート１４は、上記ランナー１５との連通箇所から、図２に示す形状の開口断面積を徐々に広げながらキャビティ１３と連通する。この構造により、ランナー１５から最短距離となるキャビティ１３の中心ＣＬが、樹脂充填時の保圧力が強くなり、キャビティ１３の両端側に向けてその保圧力が徐々に弱くなる。その結果、キャビティ１３の中心ＣＬほど、樹脂３１（図５（Ａ）参照）が勢い良くキャビティ１３内へと注入され、キャビティ１３内でも先行してキャビティ１３の短手方向（紙面前後方向）へと流動し易くなる。 Here, as shown in FIG. 1B, the runner 15 communicates with the resin injection gate 14 on an extension line of the center CL of the cavity 13. Then, the resin injection gate 14 communicates with the cavity 13 while gradually expanding the opening cross-sectional area of the shape shown in FIG. With this structure, the center CL of the cavity 13, which is the shortest distance from the runner 15, has a stronger holding pressure when the resin is filled, and the holding pressure gradually decreases toward both ends of the cavity 13. As a result, the resin 31 (see FIG. 5(A)) is more vigorously injected into the cavity 13 toward the center CL of the cavity 13, and even within the cavity 13, the resin 31 precedes in the lateral direction of the cavity 13 (front-back direction of the paper). And it becomes easy to flow.
　しかしながら、本実施形態では、図２に示す如く、樹脂注入ゲート１４の開口部１４Ａの開口幅Ｗ１は、キャビティ１３の中心ＣＬよりもキャビティ１３の両端部の方が広くなるように形成されている。この構造により、キャビティ１３の両端部に向けて樹脂３１（図５（Ａ）参照）の流動断面積が大きくなり、多少樹脂充填時の保圧力が弱くなっても、樹脂３１の流動性により、キャビティ１３の両端部側へも中心ＣＬ側と出来る限り均一に樹脂３１を供給することが可能となる。 However, in the present embodiment, as shown in FIG. 2, the opening width W1 of the opening portion 14A of the resin injection gate 14 is formed such that both end portions of the cavity 13 are wider than the center CL of the cavity 13. .. With this structure, the flow cross-sectional area of the resin 31 (see FIG. 5(A)) increases toward both ends of the cavity 13, and even if the holding pressure at the time of resin filling becomes weak, the flowability of the resin 31 causes It is possible to supply the resin 31 to both ends of the cavity 13 as evenly as possible on the center CL side.
　更には、樹脂注入ゲート１４は、キャビティ１３の長手方向（紙面左右方向）において、レンズ形成領域４４の外側まで形成されている。この構造により、キャビティ１３への樹脂充填時に、レンズ形成領域４４では、キャビティ１３の中心ＣＬ側から樹脂３１の廻り込みによる合流が発生し難くなり、樹脂レンズプレート４１（図６（Ａ）参照）のレンズ形成領域４４にウェルドラインが形成されることが防止される。 Further, the resin injection gate 14 is formed up to the outside of the lens forming region 44 in the longitudinal direction of the cavity 13 (left-right direction on the paper surface). With this structure, at the time of filling the cavity 13 with resin, in the lens forming region 44, it is difficult for merging due to the wraparound of the resin 31 from the center CL side of the cavity 13, and the resin lens plate 41 (see FIG. 6A). It is prevented that a weld line is formed in the lens forming region 44 of FIG.
　図３は、図１（Ａ）に示す成形金型１０のＢ－Ｂ線方向の断面図であり、成形金型１０の樹脂流動経路１７を説明する図である。 3 is a cross-sectional view of the molding die 10 shown in FIG. 1(A) taken along the line BB, and is a view for explaining the resin flow path 17 of the molding die 10.
　図３に示す如く、樹脂流動経路１７は、第１及び第２の金型１１、１２のレンズ組み立て領域４５に形成されている。そして、第１及び第２の金型１１、１２の加工面１１Ｃ、１２Ｃに形成された窪み領域１１Ｆ、１２Ｆが一致している。樹脂流動経路１７の厚み方向（紙面上下方向）の空間幅Ｗ３は、例えば、０．９ｍｍ以上１．５ｍｍ以下であり、レンズ形成領域４４の平坦領域１１Ｅ、１２Ｅの空間幅Ｗ４と同等または広くなり、レンズ成形用の凹部１１Ｄ、１２Ｄの空間幅Ｗ５よりも若干狭くなっている。 As shown in FIG. 3, the resin flow path 17 is formed in the lens assembly area 45 of the first and second molds 11 and 12. Then, the recessed regions 11F and 12F formed on the machined surfaces 11C and 12C of the first and second molds 11 and 12 are aligned with each other. The space width W3 in the thickness direction (vertical direction of the paper surface) of the resin flow path 17 is, for example, 0.9 mm or more and 1.5 mm or less, and is equal to or wider than the space width W4 of the flat regions 11E and 12E of the lens forming region 44. The space width W5 of the recesses 11D and 12D for lens molding is slightly narrower.
　図１（Ｂ）を用いて上述したように、キャビティ１３の樹脂流動経路１７は、キャビティ１３内にてランナー１５（図１（Ｂ）参照）と樹脂注入ゲート１４（図１（Ｂ）参照）の連通箇所から最も遠い位置にあり、樹脂充填時の保圧力が、キャビティ１３の中心ＣＬより弱まる。しかしながら、直線状の樹脂流動経路１７がキャビティ１３の短手方向（紙面前後方向）に向けて形成されることで、レンズ組み立て領域４５での充填速度を早めることができる。 As described above with reference to FIG. 1B, the resin flow path 17 of the cavity 13 has the runner 15 (see FIG. 1B) and the resin injection gate 14 (see FIG. 1B) in the cavity 13. At the position farthest from the communicating point of, the holding pressure at the time of resin filling becomes weaker than the center CL of the cavity 13. However, since the linear resin flow path 17 is formed in the lateral direction of the cavity 13 (front-back direction of the paper surface), the filling speed in the lens assembly region 45 can be increased.
　図４は、図１（Ａ）に示す成形金型１０のＣ－Ｃ線方向の断面図であり、成形金型１０の捨てタブ１６を説明する図である。 FIG. 4 is a cross-sectional view of the molding die 10 shown in FIG. 1A taken along the line CC, and is a view for explaining the discarding tab 16 of the molding die 10.
　先ず、図１（Ａ）に示す如く、捨てタブ１６は、樹脂注入ゲート１４が配設されるキャビティ１３の側面に対して、反対側のキャビティ１３の側面に配設されている。そして、捨てタブ１６が連通するキャビティ１３との境界断面において、捨てタブ１６の開口領域のセンターが、キャビティ１３の中心ＣＬと一致し、捨てタブ１６は、少なくともレンズ形成領域４４の一部をカバーするように配設されている。 First, as shown in FIG. 1(A), the discarding tab 16 is arranged on the side surface of the cavity 13 opposite to the side surface of the cavity 13 in which the resin injection gate 14 is arranged. Then, in the boundary cross section with the cavity 13 with which the discarding tab 16 communicates, the center of the opening region of the discarding tab 16 matches the center CL of the cavity 13, and the discarding tab 16 covers at least a part of the lens forming region 44. It is arranged to do.
　次に、図４に示す如く、捨てタブ１６は、例えば、第１の金型１１の型面１１Ａはキャビティ１３と連続した平坦面として形成され、第２の金型１２の型面１２Ａは凹凸形状に形成されている。そして、捨てタブ１６には、キャビティ１３のレンズ形成領域４４を流れる樹脂３１（図５（Ａ）参照）の一部が流れ込み、樹脂レンズプレート４１（図６（Ａ）参照）のレンズ形成領域４４に発生する恐れがあるウェルド等をキャビティ１３外部へと流し出すことができる。その結果、特に、樹脂レンズプレート４１のレンズ形成領域４４にウェルドや反り等が発生することを防止し、樹脂レンズプレート４１の光学製品としての高品質性を維持することができる。 Next, as shown in FIG. 4, in the discarding tab 16, for example, the mold surface 11A of the first mold 11 is formed as a flat surface continuous with the cavity 13, and the mold surface 12A of the second mold 12 is uneven. It is formed in a shape. Then, a part of the resin 31 (see FIG. 5A) flowing in the lens forming region 44 of the cavity 13 flows into the discarding tab 16, and the lens forming region 44 of the resin lens plate 41 (see FIG. 6A). A weld or the like that may occur in the cavity can be poured out of the cavity 13. As a result, in particular, it is possible to prevent welds, warps, and the like from occurring in the lens forming region 44 of the resin lens plate 41, and maintain the high quality of the resin lens plate 41 as an optical product.
　図５（Ａ）から図５（Ｃ）は、本実施形態の成形金型１０内での樹脂３１の充填状況を説明する平面図であり、図５（Ｄ）は、本実施形態の成形金型１０内での樹脂３１の充填状況を説明する断面図である。尚、図５（Ａ）から図５（Ｃ）では、説明の都合上、成形金型１０を簡略化して図示している。 5(A) to 5(C) are plan views for explaining the filling state of the resin 31 in the molding die 10 of the present embodiment, and FIG. 5(D) is the molding die of the present embodiment. FIG. 4 is a cross-sectional view illustrating a filling state of resin 31 in the mold 10. 5(A) to 5(C), the molding die 10 is shown in a simplified manner for convenience of explanation.
　樹脂充填時には、ポッド（図示せず）で溶融された液状または半固形状の樹脂３１が、ランナー１５を経由して樹脂注入ゲート１４からキャビティ１３内へと注入される。ここで、本実施の形態では、樹脂３１としては、シクロオレフィンポリマー樹脂、ポリカーボネート樹脂またはアクリル樹脂が用いられる。 At the time of resin filling, liquid or semi-solid resin 31 melted in a pod (not shown) is injected into the cavity 13 from the resin injection gate 14 via the runner 15. Here, in the present embodiment, as the resin 31, a cycloolefin polymer resin, a polycarbonate resin, or an acrylic resin is used.
　そして、樹脂成形条件としては、例えば、樹脂３１は、キャビティ１３内での温度が２７０度以上２９０度以下となるようにポッドにて加熱され、キャビティ１３への射出速度が２０ｍｍ／ｓ以上５０ｍｍ／ｓ以下、その保圧力が５０Ｍｐａ以上８０Ｍｐａ以下となるように調整される。 As the resin molding conditions, for example, the resin 31 is heated in the pod so that the temperature in the cavity 13 is 270 degrees or more and 290 degrees or less, and the injection speed into the cavity 13 is 20 mm/s or more and 50 mm/s or less. s or less, the holding pressure is adjusted to be 50 Mpa or more and 80 Mpa or less.
　図５（Ａ）に示す如く、上記樹脂成形条件に調整された樹脂３１は、樹脂注入ゲート１４からキャビティ１３内へと注入される。そして、図１及び図２を用いて説明したように、ランナー１５は、キャビティ１３の中心ＣＬにて樹脂注入ゲート１４と連通する。また、樹脂注入ゲート１４の開口部１４Ａは、その開口幅Ｗ１がキャビティ１３の中心ＣＬよりもキャビティ１３の両端部の方が広くなるように、形成されている。 As shown in FIG. 5(A), the resin 31 adjusted to the above resin molding conditions is injected from the resin injection gate 14 into the cavity 13. Then, as described with reference to FIGS. 1 and 2, the runner 15 communicates with the resin injection gate 14 at the center CL of the cavity 13. The opening 14A of the resin injection gate 14 is formed so that the opening width W1 is wider at both ends of the cavity 13 than at the center CL of the cavity 13.
　この構造により、樹脂注入ゲート１４からキャビティ１３内へと注入される樹脂３１の量は、キャビティ１３の両端部側においても、キャビティ１３の中心ＣＬ側より若干少ない程度となる。そして、キャビティ１３の両端部には、一対の樹脂流動経路１７が設けられることで、樹脂３１の流動性も向上される。その結果、保圧力の関係により、キャビティ１３の中心ＣＬ側に注入された樹脂３１の方が、若干、先行して流動するが、図示したように、樹脂３１は、キャビティ１３の全体において、捨てタブ１６側へと向けて出来る限り均一に流動する。 With this structure, the amount of the resin 31 injected from the resin injection gate 14 into the cavity 13 is slightly smaller on both ends of the cavity 13 than on the center CL side of the cavity 13. The pair of resin flow paths 17 are provided at both ends of the cavity 13, so that the fluidity of the resin 31 is also improved. As a result, the resin 31 injected to the center CL side of the cavity 13 flows slightly ahead of the cavity 13 due to the holding pressure, but as shown in the figure, the resin 31 is discarded in the entire cavity 13. It flows toward the tab 16 side as evenly as possible.
　次に、図５（Ｂ）に示す如く、引き続き、樹脂注入ゲート１４からキャビティ１３内へと樹脂３１を注入することで、キャビティ１３内は樹脂３１にて充填されていく。図３を用いて上述したように、キャビティ１３の両端部側では、開口幅Ｗ１が広い形状の樹脂注入ゲート１４と連通した樹脂流動経路１７が配設されている。 Next, as shown in FIG. 5B, by continuously injecting the resin 31 from the resin injection gate 14 into the cavity 13, the cavity 13 is filled with the resin 31. As described above with reference to FIG. 3, the resin flow path 17 communicating with the resin injection gate 14 having a wide opening width W1 is provided on both end sides of the cavity 13.
　この構造により、キャビティ１３の両端部側での樹脂３１の注入量が増大し、更に、樹脂３１の流動性が向上する。そして、樹脂３１が、キャビティ１３の全体において、捨てタブ１６側へと向けて出来る限り均一に流動する。その結果、少なくともレンズ形成領域４４では、一方向（紙面前後方向）に流動する樹脂３１により充填されることで、キャビティ１３内での樹脂３１の廻り込みによる合流が発生し難くなり、樹脂レンズプレート４１（図６（Ａ）参照）のレンズ形成領域４４にウェルドラインが形成されることが防止される。 With this structure, the injection amount of the resin 31 on both ends of the cavity 13 is increased, and the fluidity of the resin 31 is further improved. Then, the resin 31 flows in the entire cavity 13 toward the discard tab 16 side as uniformly as possible. As a result, at least the lens formation region 44 is filled with the resin 31 that flows in one direction (the front-back direction of the paper surface), so that a confluence due to the wraparound of the resin 31 in the cavity 13 is less likely to occur, and the resin lens plate The weld line is prevented from being formed in the lens forming region 44 of 41 (see FIG. 6A).
　次に、図５（Ｃ）に示す如く、引き続き、樹脂注入ゲート１４からキャビティ１３内へと樹脂３１を注入することで、キャビティ１３内が樹脂３１にて完全に充填されると共に、最初にキャビティ１３に注入された樹脂３１の一部が、捨てタブ１６へと流れ込む。ここで、最初にキャビティ１３内へと注入された樹脂３１は、キャビティ１３内の空気を巻き込みながら流動することや、また、温度が低下し易いこと等により、ウェルドが発生し易くなる。 Next, as shown in FIG. 5C, by continuously injecting the resin 31 from the resin injection gate 14 into the cavity 13, the inside of the cavity 13 is completely filled with the resin 31, and the A part of the resin 31 injected into 13 flows into the discarding tab 16. Here, the resin 31 first injected into the cavity 13 flows while entraining the air in the cavity 13, and the temperature is easily lowered, so that the weld is likely to occur.
　そして、捨てタブ１６を設けることで、上記ウェルドの発生し易い領域の樹脂３１をキャビティ１３外部へと流し出すことができる。あるいは、上記ウェルドの発生し易い領域の樹脂３１をレンズ組み立て領域４５へと追い込むことができる。その結果、特に、樹脂レンズプレート４１のレンズ形成領域４４にウェルドや反り等の発生が防止され、樹脂レンズプレート４１（図６（Ａ）参照）が、光学製品としての高品質性を維持することができる。 By providing the discarding tab 16, the resin 31 in the region where the weld is likely to occur can be poured out of the cavity 13. Alternatively, the resin 31 in the region where the weld is likely to occur can be driven into the lens assembly region 45. As a result, in particular, the occurrence of weld, warp, etc. in the lens forming region 44 of the resin lens plate 41 is prevented, and the resin lens plate 41 (see FIG. 6A) maintains high quality as an optical product. You can
　更に、図５（Ａ）から図５（Ｃ）を用いて説明したように、樹脂３１が、キャビティ１３の全体を出来る限り均一に流動することで、キャビティ１３の中心ＣＬ側に位置するレンズ形成領域４４を先行して充填し、その後、大幅に遅れてキャビティ１３の両端部側の領域を充填することが防止される。この構造により、キャビティ１３の中心ＣＬの樹脂注入ゲート１４に近い領域に、樹脂充填時の大きな保圧力が長い時間加わることが防止される。その結果、樹脂３１への内部応力分布差により、樹脂レンズプレート４１に反りが発生し、また、偏肉が発生したりすることが防止される。そして、樹脂レンズプレート４１が、光学製品としての高品質性を維持することができる。 Further, as described with reference to FIGS. 5A to 5C, the resin 31 flows through the entire cavity 13 as uniformly as possible to form a lens located on the center CL side of the cavity 13. It is prevented that the region 44 is filled first and then the regions on both ends of the cavity 13 are filled with a large delay. This structure prevents a large holding pressure during resin filling from being applied to the region of the center CL of the cavity 13 near the resin injection gate 14 for a long time. As a result, it is possible to prevent the resin lens plate 41 from warping and uneven thickness due to the difference in the internal stress distribution to the resin 31. Then, the resin lens plate 41 can maintain high quality as an optical product.
　最後に、図５（Ｄ）に示す如く、レンズ形成領域４４では、樹脂３１は、樹脂レンズプレート４１（図６（Ａ）参照）の板厚部を流動しながら、矢印３３にて示すように、第１及び第２の金型１１、１２に設けられた凹部１１Ｄ、１２Ｄ内も充填していく。図示したように、第１及び第２の金型１１、１２には、凹部１１Ｄ、１２Ｄの周囲を囲むように平坦領域１１Ｅ、１２Ｅが形成され、平坦領域１１Ｅ、１２Ｅは、レンズ形成領域４４では網の目状に連続し、その終端部は、レンズ組み立て領域４５（図１（Ｂ）参照）へと連続している。 Finally, as shown in FIG. 5D, in the lens formation region 44, the resin 31 flows through the thick portion of the resin lens plate 41 (see FIG. 6A), as shown by the arrow 33. , The recesses 11D and 12D provided in the first and second molds 11 and 12 are also filled. As shown, flat regions 11E and 12E are formed in the first and second molds 11 and 12 so as to surround the recesses 11D and 12D, and the flat regions 11E and 12E are formed in the lens forming region 44. It is continuous like a mesh, and its end portion is continuous to the lens assembly region 45 (see FIG. 1B).
　ここで、凹部１１Ｄ、１２Ｄの曲率半径は、例えば、０．４ｍｍ以上０．６ｍｍ以下にて形成され、凹部１１Ｄ、１２Ｄは、０．３ｍｍ以上０．５ｍｍ以下のピッチにて行列状に形成されている。この構造により、丸印３４にて示すように、樹脂３１の流動方向（紙面前後方向）において、凹部１１Ｄ、１２Ｄと平坦領域１１Ｅ、１２Ｅとの境界領域の突起形状が無くなると共に、凹部１１Ｄ、１２Ｄの深さが浅くなる。その結果、凹部１１Ｄ、１２Ｄと平坦領域１１Ｅ、１２Ｅとの境界領域にて、乱流が発生し難くなり、丸印３４にて示す樹脂レンズプレート４１（図６（Ａ）参照）のレンズ４７（図６（Ｂ）参照）の後端部側にウェルド１１６（図９（Ｂ）参照）が発生し難くなり、複屈折により浮遊映像に悪影響を及ぼすことが防止される。 Here, the radius of curvature of the recesses 11D and 12D is, for example, 0.4 mm or more and 0.6 mm or less, and the recesses 11D and 12D are formed in a matrix at a pitch of 0.3 mm or more and 0.5 mm or less. ing. With this structure, as indicated by the circle 34, in the flow direction of the resin 31 (front-back direction of the paper surface), the protrusion shape in the boundary region between the recesses 11D, 12D and the flat regions 11E, 12E is eliminated, and the recesses 11D, 12D are removed. Becomes shallower. As a result, turbulence is less likely to occur in the boundary region between the recesses 11D and 12D and the flat regions 11E and 12E, and the lens 47 (see FIG. 6A) of the resin lens plate 41 (see FIG. 6A) indicated by the circle 34 is shown. The weld 116 (see FIG. 9B) is less likely to occur on the rear end side of the (see FIG. 6B) side, and it is possible to prevent the floating image from being adversely affected by the birefringence.
　次に、本発明の他の実施形態に係る樹脂レンズプレート４１を図面に基づき詳細に説明する。そして、樹脂レンズプレート４１は、図１から図５を用いて上述した成形金型１０を用いて成形されるため、以下の樹脂レンズプレート４１の説明の際には、図１から図５を用いて説明した成形金型１０の説明を適宜参照し、同一の部材には原則として同一の符番を用い、繰り返しの説明は省略する。 Next, a resin lens plate 41 according to another embodiment of the present invention will be described in detail with reference to the drawings. Since the resin lens plate 41 is molded using the molding die 10 described above with reference to FIGS. 1 to 5, the resin lens plate 41 will be described below with reference to FIGS. 1 to 5. The description of the molding die 10 described above is appropriately referred to, the same reference numerals are used in principle for the same members, and repeated description will be omitted.
　図６（Ａ）は、本実施形態の樹脂レンズプレート４１を説明する斜視図である。図６（Ｂ）は、本実施形態の樹脂レンズプレート４１を説明する拡大断面図である。 FIG. 6A is a perspective view illustrating the resin lens plate 41 of this embodiment. FIG. 6B is an enlarged cross-sectional view illustrating the resin lens plate 41 of this embodiment.
　図６（Ａ）では、成形金型１０から離形した直後の樹脂レンズプレート４１を示している。樹脂レンズプレート４１は、薄板形状の略６面体である。そして、樹脂レンズプレート４１の第１の主面４２（図６（Ｂ）参照）及び第２の主面４３では、その大部分がレンズ形成領域４４として形成され、レンズ形成領域４４の周囲を囲むようにレンズ組み立て領域４５が環状に形成されている。尚、レンズ組み立て領域４５は、樹脂レンズプレート４１の外周端部４６を形成している。 FIG. 6A shows the resin lens plate 41 immediately after being released from the molding die 10. The resin lens plate 41 is a thin plate-shaped substantially hexahedral body. Then, in the first main surface 42 (see FIG. 6B) and the second main surface 43 of the resin lens plate 41, most of them are formed as the lens forming region 44 and surround the periphery of the lens forming region 44. Thus, the lens assembly area 45 is formed in an annular shape. The lens assembly region 45 forms the outer peripheral end portion 46 of the resin lens plate 41.
　上述したように、第１の主面４２には、第１の金型１１（図１（Ｂ）参照）の型面１１Ａ（図１（Ｂ）参照）の形状が転写され、第２の主面４３には、第２の金型１２（図２参照）の型面１２Ａ（図２参照）の形状が転写されている。そして第１及び第２の主面４２、４３には、球面形状の複数のレンズ４７が、行列状に形成されている。 As described above, the shape of the mold surface 11A (see FIG. 1B) of the first mold 11 (see FIG. 1B) is transferred to the first main surface 42, and the second main surface 42 is transferred. On the surface 43, the shape of the die surface 12A (see FIG. 2) of the second die 12 (see FIG. 2) is transferred. A plurality of spherical lenses 47 are formed in a matrix on the first and second main surfaces 42, 43.
　図示したように、成形金型１０から離形した直後には、樹脂レンズプレート４１には、樹脂注入ゲート１４（図１（Ａ）参照）の形状に硬化した硬化樹脂４８、ランナー１５（図１（Ａ）参照）の形状に硬化した硬化樹脂４９及び捨てタブ１６（図１（Ａ）参照）の形状に硬化した硬化樹脂５０が一体に形成されている。 As shown in the figure, immediately after the mold is released from the molding die 10, the resin lens plate 41 has a cured resin 48 cured in the shape of the resin injection gate 14 (see FIG. 1A) and a runner 15 (see FIG. 1). A cured resin 49 cured in the shape of (A) and a cured resin 50 cured in the shape of the discard tab 16 (see FIG. 1A) are integrally formed.
　図６（Ｂ）では、レンズ形成領域４４の一部を拡大して図示している。上述したように、樹脂レンズプレート４１のレンズ形成領域４４では、複数のレンズ４７が、例えば、０．３ｍｍ以上０．５ｍｍ以下のピッチにて行列状に形成されている。各レンズ４７間は、平坦領域５１として形成されている。そして、樹脂レンズプレート４１の第１及び第２の主面４２、４３には、一点鎖線５２にて示すように、厚み方向（紙面上下方向）のレンズ４７の光軸が一致するように、複数のレンズ４７が形成されている。 In FIG. 6B, a part of the lens formation region 44 is shown in an enlarged manner. As described above, in the lens forming region 44 of the resin lens plate 41, the plurality of lenses 47 are formed in a matrix at a pitch of 0.3 mm or more and 0.5 mm or less, for example. A flat region 51 is formed between the lenses 47. A plurality of resin lenses is provided on the first and second main surfaces 42, 43 of the resin lens plate 41 so that the optical axes of the lenses 47 in the thickness direction (vertical direction on the paper surface) coincide with each other, as indicated by a chain line 52. Lens 47 is formed.
　レンズ形成領域４４では、レンズ４７の形成領域の厚みＴ１は、例えば、１．２ｍｍ±０．５ｍｍにて形成され、平坦領域５１の形成領域の厚みＴ２は、例えば、１．１ｍｍ±０．５ｍｍにて形成されている。そして、レンズ４７の曲率半径は、例えば０．４ｍｍ以上０．６ｍｍ以下にて形成されている。 In the lens formation region 44, the thickness T1 of the formation region of the lens 47 is 1.2 mm±0.5 mm, and the thickness T2 of the formation region of the flat region 51 is 1.1 mm±0.5 mm, for example. It is formed by. The radius of curvature of the lens 47 is, for example, 0.4 mm or more and 0.6 mm or less.
　図示したように、平坦領域５１には、太線にて示すように、粗面加工が施される一方、レンズ４７には、鏡面加工が施されている。具体的には、第１及び第２の金型１１、１２の型面１１Ａ、１２Ａの平坦領域１１Ｅ、１２Ｅに対応する領域には、ブラスト処理、化学的エッチング処理や研磨処理等の粗面加工が施されている。 As shown in the figure, the flat area 51 is roughened as shown by the thick line, while the lens 47 is mirror-finished. Specifically, in the areas corresponding to the flat areas 11E and 12E of the mold surfaces 11A and 12A of the first and second molds 11 and 12, rough surface processing such as blasting, chemical etching or polishing is performed. Has been applied.
　そして、２枚の樹脂レンズプレート４１が、複数のレンズ４７同士の光軸合わせをした状態にて、レンズ組み立て領域４５を利用して貼り合されることで、樹脂正立レンズアレイ（図示せず）として用いられる。上述したように、レンズ形成領域４４には、粗面加工が施された平坦領域５１が形成されることで、レンズ４７領域以外から樹脂レンズプレート４１内に入射した透過光を平坦領域５１にて乱反射させることができる。つまり、平坦領域５１が、開口絞り機能としての遮光部として用いられることで、高品質の浮遊映像を実現することができる。 Then, the two resin lens plates 41 are attached to each other by using the lens assembly area 45 in a state where the optical axes of the plurality of lenses 47 are aligned with each other, so that the resin erect lens array (not shown) is attached. ) Used as. As described above, in the lens forming region 44, the flat region 51 having the roughened surface is formed, so that the transmitted light incident on the inside of the resin lens plate 41 from the regions other than the lens 47 region is transmitted to the flat region 51. Diffuse reflection is possible. That is, since the flat area 51 is used as a light blocking portion having an aperture stop function, a high quality floating image can be realized.
　次に、本発明の他の実施形態に係る成形金型６０を図面に基づき詳細に説明する。そして、成形金型６０は、図１から図４を用いて上述した成形金型１０とは、そのキャビティ６２の形状が異なる以外は、実質、同一の構造であり、以下の説明の際には、図１から図６を用いて説明した成形金型１０及び樹脂レンズプレート４１の説明を適宜参照し、同一の部材には原則として同一の符番を用い、繰り返しの説明は省略する。 Next, a molding die 60 according to another embodiment of the present invention will be described in detail with reference to the drawings. Further, the molding die 60 has substantially the same structure as the molding die 10 described above with reference to FIGS. 1 to 4 except that the shape of the cavity 62 is different, and in the following description, The description of the molding die 10 and the resin lens plate 41 described with reference to FIGS. 1 to 6 will be appropriately referred to, the same reference numerals will be used for the same members in principle, and repeated description will be omitted.
　図７（Ａ）は、本実施形態の成形金型６０を説明する断面図であり、図１（Ａ）に示す成形金型１０のＤ－Ｄ線方向の断面を示している。図７（Ｂ）は、図７（Ａ）の成形金型６０の丸印６３にて示す領域を説明する拡大断面図である。 FIG. 7(A) is a cross-sectional view illustrating the molding die 60 of the present embodiment, and shows a cross section taken along the line DD of the molding die 10 shown in FIG. 1(A). FIG. 7B is an enlarged cross-sectional view illustrating a region indicated by a circle 63 of the molding die 60 of FIG. 7A.
　図７（Ａ）に示す如く、成形金型６０は、成形金型１０と同様に、主に、第１の金型１１と第２の金型１２とから構成される。第１及び第２の金型１１、１２が当接することで、第１及び第２の金型１１、１２内には、樹脂３１（図５（Ａ）参照）が流動する、点線２１（図１（Ａ）参照）にて示す連通空間２２（図１（Ａ）参照）が形成されている。成形金型６０の連通空間２２には、主に、樹脂レンズプレート４１（図６（Ａ）参照）を成形するキャビティ６２と、キャビティ６２へ樹脂３１を注入する樹脂注入ゲート１４（図１（Ａ）参照）と、樹脂注入ゲート１４と連通するランナー１５（図１（Ａ）参照）と、キャビティ６２と連通する捨てタブ１６（図１（Ａ）参照）と、が形成されている。 As shown in FIG. 7(A), the molding die 60 is mainly composed of a first die 11 and a second die 12, like the molding die 10. When the first and second molds 11 and 12 come into contact with each other, the resin 31 (see FIG. 5A) flows in the first and second molds 11 and 12, and the dotted line 21 (see FIG. 1(A)), a communication space 22 (see FIG. 1(A)) is formed. The communication space 22 of the molding die 60 mainly includes a cavity 62 for molding the resin lens plate 41 (see FIG. 6A) and a resin injection gate 14 for injecting the resin 31 into the cavity 62 (see FIG. )), a runner 15 (see FIG. 1A) that communicates with the resin injection gate 14, and a discard tab 16 (see FIG. 1A) that communicates with the cavity 62.
　図示したように、第１の金型１１の型面１１Ａ及び第２の金型１２の型面１２Ａには、半球形状の微小レンズ成形用の凹部１１Ｄが所定のピッチにて行列状に配列されている。そして、二点鎖線６４，６５は、第２の金型１２の型面１２Ａの傾斜ラインを示すが、第２の金型１２の型面１２Ａは、上述した樹脂注入ゲート１４の構造と同様に、キャビティ６２の中心ＣＬよりもキャビティ６２の両端部の方が広くなるように形成されている。具体的には、第２の金型１２の型面１２Ａはキャビティ６２の中心ＣＬを頂部とした傾斜面として形成されている。尚、本実施形態では、第２の金型１２の型面１２Ａが傾斜面として形成される場合に限定されるものではない。例えば、第１の金型１１の型面１１Ａが傾斜面及び第２の金型１２の型面１２Ａが平坦面（水平面）となる場合や第１の金型１１の型面１１Ａ及び第２の金型１２の型面１２Ａが傾斜面となる場合でも良い。 As shown in the drawing, hemispherical concave portions 11D for forming microlenses are arranged in a matrix at a predetermined pitch on the mold surface 11A of the first mold 11 and the mold surface 12A of the second mold 12. ing. Then, the alternate long and two short dashes lines 64 and 65 indicate the inclined lines of the mold surface 12A of the second mold 12, and the mold surface 12A of the second mold 12 has the same structure as the resin injection gate 14 described above. The both ends of the cavity 62 are formed to be wider than the center CL of the cavity 62. Specifically, the mold surface 12A of the second mold 12 is formed as an inclined surface with the center CL of the cavity 62 as the apex. Note that the present embodiment is not limited to the case where the mold surface 12A of the second mold 12 is formed as an inclined surface. For example, when the mold surface 11A of the first mold 11 is an inclined surface and the mold surface 12A of the second mold 12 is a flat surface (horizontal surface), or when the mold surface 11A of the first mold 11 and the second mold surface The mold surface 12A of the mold 12 may be an inclined surface.
　図７（Ｂ）では、説明の都合上、第２の金型１２の型面１２Ａの傾斜を実際よりも大きく傾斜させて示しているが、第２の金型１２では、キャビティ６２の中心ＣＬ側の方が、キャビティ６２の端部側より、凹部１１Ｄの深さが深くなっている。その逆に、キャビティ６２の凹部１１Ｄ間の平坦領域１１Ｅ、１２Ｅの空間幅Ｗ４は、キャビティ６２の中心ＣＬ側の方が、キャビティ６２の端部側より短くなっている。尚、第１の金型１１の型面１１Ａは平坦面として形成されている。 In FIG. 7B, for convenience of description, the inclination of the mold surface 12A of the second mold 12 is shown to be larger than it actually is, but in the second mold 12, the center CL of the cavity 62 is shown. On the side, the depth of the recess 11D is deeper than on the end side of the cavity 62. On the contrary, the space width W4 of the flat regions 11E and 12E between the recesses 11D of the cavity 62 is shorter on the center CL side of the cavity 62 than on the end side of the cavity 62. The mold surface 11A of the first mold 11 is formed as a flat surface.
　この構造により、キャビティ６２の両端部に向けて樹脂３１（図５（Ａ）参照）の流動断面積が大きくなり、多少樹脂充填時の保圧力が弱くなっても、樹脂３１の流動性により、キャビティ６２の両端部側へも中心ＣＬ側と出来る限り均一に樹脂３１を供給することが可能となる。 With this structure, the flow cross-sectional area of the resin 31 (see FIG. 5(A)) increases toward both ends of the cavity 62, and even if the holding pressure at the time of resin filling becomes weak, the flowability of the resin 31 causes It is possible to supply the resin 31 to both ends of the cavity 62 as evenly as possible on the center CL side.
　更には、樹脂注入ゲート１４と連続してキャビティ６２内も傾斜させることで、キャビティ６２への樹脂充填時に、レンズ形成領域４４（図２参照）では、キャビティ６２の中心ＣＬ側から樹脂３１の廻り込みによる合流が発生し難くなり、樹脂レンズプレート４１（図６（Ａ）参照）のレンズ形成領域４４にウェルドラインが形成されることが防止される。 Furthermore, by inclining the inside of the cavity 62 continuously with the resin injection gate 14, when the resin is filled into the cavity 62, in the lens forming region 44 (see FIG. 2 ), the resin 31 is rotated from the center CL side of the cavity 62. Confluence due to jamming is less likely to occur, and a weld line is prevented from being formed in the lens forming region 44 of the resin lens plate 41 (see FIG. 6A).
　尚、本実施形態では、樹脂レンズプレート４１の第１及び第２の主面４２、４３に複数のレンズ４７を形成するため、第１及び第２の金型１１、１２の型面１１Ａ、１２Ａに複数のレンズ成形用の凹部１１Ｄ、１２Ｄを形成する場合について説明したが、この場合に限定するものではない。例えば、少なくとも樹脂レンズプレート４１の第１の主面４２または第２の主面４３のどちらか一方に複数のレンズ４７を形成するため、第１及び第２の金型１１、１２の型面１１Ａ、１２Ａのどちらか一方に複数のレンズ成形用の凹部１１Ｄ、１２Ｄを形成する場合でも同様な効果を得ることができる。 In this embodiment, since the plurality of lenses 47 are formed on the first and second main surfaces 42 and 43 of the resin lens plate 41, the mold surfaces 11A and 12A of the first and second molds 11 and 12 are formed. Although the case where a plurality of lens forming recesses 11D and 12D are formed has been described above, the present invention is not limited to this case. For example, since the plurality of lenses 47 are formed on at least one of the first main surface 42 and the second main surface 43 of the resin lens plate 41, the mold surfaces 11A of the first and second molds 11 and 12 are formed. , 12A, a similar effect can be obtained even when a plurality of lens forming recesses 11D, 12D are formed.
　また、図２に示す樹脂注入ゲート１４の開口部１４Ａの長手方向（紙面左右方向）の開口幅Ｗ２は、レンズ形成領域４４よりも幅広く形成されている場合について説明したが、この場合に限定するものではない。例えば、上記開口部１４Ａの開口幅Ｗ２が、レンズ形成領域４４と同一幅または若干狭い幅の場合でも良い。つまり、レンズ形成領域４４において、キャビティ１３の中心ＣＬ側の樹脂３１が廻り込むことでウェルドラインの発生が防止され、また、キャビティ１３全体での出来る限り均一な樹脂３１の充填により樹脂３１への内部応力分布差の発生が防止されれば良い。その他、本発明の要旨を逸脱しない範囲にて種々の変更が可能である。 In addition, the opening width W2 of the opening portion 14A of the resin injection gate 14 shown in FIG. 2 in the longitudinal direction (left and right direction of the paper surface) has been described as being wider than the lens forming region 44, but this is not the only case. Not a thing. For example, the opening width W2 of the opening 14A may be the same as or slightly narrower than the lens forming region 44. That is, in the lens formation region 44, the weld line is prevented from being generated by the resin 31 on the center CL side of the cavity 13, and the resin 31 is filled into the resin 31 as uniformly as possible in the entire cavity 13. It suffices if the occurrence of a difference in internal stress distribution is prevented. In addition, various modifications can be made without departing from the scope of the present invention.
　１０、６０　樹脂レンズプレートの成形金型
　１１　第１の金型
　１１Ａ、１２Ａ　型面
　１１Ｂ、１１Ｃ、１２Ｃ　加工面
　１１Ｄ、１２Ｄ　凹部
　１１Ｅ、１２Ｅ　平坦領域
　１１Ｆ、１２Ｆ　窪み領域
　１２　第２の金型
　１３、６２　キャビティ
　１４　樹脂注入ゲート
　１４Ａ　開口部
　１５　ランナー
　１６　捨てタブ
　１７　樹脂流動経路
　３１　樹脂
　４１　樹脂レンズプレート
　４２　第１の主面
　４３　第２の主面
　４４　レンズ形成領域
　４５　レンズ組み立て領域
　４７　レンズ
　４８、４９、５０　硬化樹脂
　５１　平坦領域
  10, 60 Mold for molding resin lens plate 11 First mold 11A, 12A Mold surface 11B, 11C, 12C Processed surface 11D, 12D Recessed portion 11E, 12E Flat area 11F, 12F Recessed area 12 Second mold 13, 62 Cavity 14 Resin Injection Gate 14A Opening 15 Runner 16 Discard Tab 17 Resin Flow Path 31 Resin 41 Resin Lens Plate 42 First Main Surface 43 Second Main Surface 44 Lens Forming Area 45 Lens Assembly Area 47 Lens 48, 49, 50 Cured resin 51 Flat area

Claims (6)

  1. 　第１の金型と第２の金型とを備え、前記第１の金型と前記第２の金型との間の連通空間は、ランナーと、前記ランナーと連通する樹脂注入ゲートと、前記樹脂注入ゲートと連通し、樹脂レンズプレートを成形するキャビティと、を有する樹脂レンズプレートの成形金型であって、
    　前記キャビティは、少なくとも第１の主面または前記第１の主面と反対面の第２の主面に複数のレンズが行列状に形成されるレンズ形成領域と、前記レンズ形成領域の周囲に環状に形成されるレンズ組み立て領域と、を有する前記樹脂レンズプレートを成形する略６面体の空間であり、
    　前記樹脂注入ゲートは、前記第１の主面を成形する前記第１の金型の型面と、前記第２の主面を成形する前記第２の金型の型面との間であり、前記略６面体の４つの側面のいずれか１つである第１の側面に対して連通し、
    　前記樹脂注入ゲートと前記キャビティとの境界断面における前記樹脂注入ゲートの開口部において、
    　前記開口部の前記第１の金型の前記型面と前記第２の金型の前記型面との間の厚み方向の開口幅は、前記キャビティの中心よりも前記キャビティの両端部に向けて広がり、
    　前記樹脂注入ゲートの前記厚み方向に対して垂直方向の開口幅は、前記レンズ形成領域と同じ幅または前記レンズ形成領域よりも幅広く設けられ、
    　前記ランナーは、前記キャビティの中心の延長線上にて前記樹脂注入ゲートと連通していることを特徴とする樹脂レンズプレートの成形金型。     A first mold and a second mold, and a communication space between the first mold and the second mold has a runner, a resin injection gate communicating with the runner, and A molding die for a resin lens plate, which has a cavity communicating with a resin injection gate and for molding a resin lens plate,
    The cavity has a lens forming area in which a plurality of lenses are formed in a matrix on at least the first main surface or a second main surface opposite to the first main surface, and an annular shape around the lens forming area. A substantially hexahedral space for molding the resin lens plate having a lens assembly region formed in
    The resin injection gate is between a mold surface of the first mold for molding the first main surface and a mold surface of the second mold for molding the second main surface, Communicates with a first side surface which is one of the four side surfaces of the substantially hexahedron,
    In the opening of the resin injection gate in the boundary cross section of the resin injection gate and the cavity,
    The opening width in the thickness direction between the die surface of the first die and the die surface of the second die of the opening is closer to both ends of the cavity than the center of the cavity. spread,
    The opening width of the resin injection gate in the direction perpendicular to the thickness direction is provided with the same width as the lens formation region or wider than the lens formation region,
    A molding die for a resin lens plate, wherein the runner communicates with the resin injection gate on an extension line of the center of the cavity.
  2. 　前記連通空間は、前記第１の側面と対向して配設される前記略６面体の第２の側面に対して連通し、前記キャビティ内に充填された樹脂の一部を前記キャビティ外へと排出するための捨てタブと、を有し、
    　前記捨てタブは、前記キャビティの中心をその開口領域のセンターとして少なくとも前記レンズ形成領域の一部に渡り配設されていることを特徴とする請求項１に記載の樹脂レンズプレートの成形金型。     The communication space communicates with a second side surface of the substantially hexahedral body that is arranged to face the first side surface, and a part of the resin filled in the cavity is moved to the outside of the cavity. Has a discarding tab for discharging,
    The molding die for a resin lens plate according to claim 1, wherein the discarding tab is disposed over at least a part of the lens forming region with the center of the cavity as the center of the opening region.
  3. 　前記レンズ組み立て領域を成形する前記キャビティには、
    　少なくとも前記第１の金型の前記型面または前記第２の金型の前記型面に、前記樹脂注入ゲート側から前記捨てタブ側に向けて直線状に窪んだ一対の樹脂流動経路が設けられ、
    　前記樹脂流動経路は、前記レンズ形成領域よりも幅広く設けられると共に、前記樹脂注入ゲートと連通していることを特徴とする請求項２に記載の樹脂レンズプレートの成形金型。     In the cavity that molds the lens assembly area,
    At least the mold surface of the first mold or the mold surface of the second mold is provided with a pair of resin flow paths linearly recessed from the resin injection gate side toward the discard tab side. ,
    The molding die for a resin lens plate according to claim 2, wherein the resin flow path is provided wider than the lens forming region and communicates with the resin injection gate.
  4. 　少なくとも前記レンズ形成領域の前記第１の金型の前記型面または前記第２の金型の前記型面には、前記レンズを成形するための複数の半球形状の凹部が形成されると共に、各前記凹部間には前記レンズ組み立て領域まで連続した平坦領域が形成されていることを特徴とする請求項１から請求項３のいずれか１項に記載の樹脂レンズプレートの成形金型。 A plurality of hemispherical recesses for molding the lens are formed on at least the mold surface of the first mold or the mold surface of the second mold in the lens forming region. The molding die for a resin lens plate according to any one of claims 1 to 3, wherein a flat region continuous to the lens assembly region is formed between the recesses.
  5. 　前記平坦領域は粗面加工され、前記凹部は鏡面加工されていることを特徴とする請求項４に記載の樹脂レンズプレートの成形金型。 The molding die for a resin lens plate according to claim 4, wherein the flat region is roughened and the recess is mirror-finished.
  6. 　前記キャビティにおける前記第１の金型の前記型面と前記第２の金型の前記型面との間の厚み方向の開口幅は、前記キャビティの中心よりも前記キャビティの両端部に向けて広がっていることを特徴とする請求項１から請求項５のいずれか１項に記載の樹脂レンズプレートの成形金型。
          The opening width in the thickness direction between the die surface of the first die and the die surface of the second die in the cavity is wider toward both ends of the cavity than the center of the cavity. The molding die for a resin lens plate according to any one of claims 1 to 5, wherein:
PCT/JP2019/045705 2018-11-29 2019-11-21 Resin lens plate molding die WO2020110918A1 (en)

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Citations (5)

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JP2003139913A (en) * 2001-11-01 2003-05-14 Pentax Corp Laminated lens
JP2003337206A (en) * 2001-05-09 2003-11-28 Nippon Sheet Glass Co Ltd Resin erecting lens array and method of making the same
JP2005172942A (en) * 2003-12-08 2005-06-30 Fuji Plastic Kk Three-dimensional ornamental using lens plate
JP2007038535A (en) * 2005-08-03 2007-02-15 Kuraray Co Ltd Manufacturing method of plate shape resin molded component
US20100109172A1 (en) * 2008-10-31 2010-05-06 Hon Hai Precision Industry Co., Ltd. Mold for making lens array and method for making lenses

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003337206A (en) * 2001-05-09 2003-11-28 Nippon Sheet Glass Co Ltd Resin erecting lens array and method of making the same
JP2003139913A (en) * 2001-11-01 2003-05-14 Pentax Corp Laminated lens
JP2005172942A (en) * 2003-12-08 2005-06-30 Fuji Plastic Kk Three-dimensional ornamental using lens plate
JP2007038535A (en) * 2005-08-03 2007-02-15 Kuraray Co Ltd Manufacturing method of plate shape resin molded component
US20100109172A1 (en) * 2008-10-31 2010-05-06 Hon Hai Precision Industry Co., Ltd. Mold for making lens array and method for making lenses

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