WO2011040148A1 - 光学素子 - Google Patents
光学素子 Download PDFInfo
- Publication number
- WO2011040148A1 WO2011040148A1 PCT/JP2010/064156 JP2010064156W WO2011040148A1 WO 2011040148 A1 WO2011040148 A1 WO 2011040148A1 JP 2010064156 W JP2010064156 W JP 2010064156W WO 2011040148 A1 WO2011040148 A1 WO 2011040148A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- optical
- mold
- heat insulation
- heat
- fine shape
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims abstract description 148
- 239000011347 resin Substances 0.000 claims abstract description 39
- 229920005989 resin Polymers 0.000 claims abstract description 39
- 238000009413 insulation Methods 0.000 claims description 38
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 238000000465 moulding Methods 0.000 abstract description 14
- 238000001746 injection moulding Methods 0.000 abstract description 8
- 239000004065 semiconductor Substances 0.000 description 11
- 230000008859 change Effects 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
-
- 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
- B29C45/0046—Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity
-
- 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
- B29C45/37—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings
- B29C45/372—Mould cavity walls, i.e. the inner surface forming the mould cavity, e.g. linings provided with means for marking or patterning, e.g. numbering articles
-
- 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00009—Production of simple or compound lenses
- B29D11/00432—Auxiliary operations, e.g. machines for filling the moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/00951—Measuring, controlling or regulating
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
- G11B7/1372—Lenses
- G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
-
- 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
- B29C45/72—Heating or cooling
- B29C45/73—Heating or cooling of the mould
- B29C2045/7343—Heating or cooling of the mould heating or cooling different mould parts at different temperatures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2011/00—Optical elements, e.g. lenses, prisms
Definitions
- the present invention relates to an optical element having a fine shape on an optical surface, particularly an objective lens and other optical elements incorporated in an optical pickup device.
- a temperature sensor is provided in the vicinity of the cavity surface, and the molding temperature of the optical element is controlled by a cooling device that sends a refrigerant to a flow path near the cavity and a heating device that uses a heater that heats the refrigerant.
- a heat cycle system for injection molding see Patent Document 1.
- a resin optical element has an optical function part having a fine shape on one side molded on the movable mold side, a flange part around the optical function part, and an optical axis direction on the flange part.
- a heat shrinkage prevention portion for preventing heat shrinkage in the orthogonal direction (see Patent Document 2).
- the heat shrinkage prevention portion is, for example, an inner surface of the flange portion.
- an object of the present invention is to provide an optical element in which a fine shape or the like is transferred to the outer edge side of the lens with high accuracy while preventing an increase in cycle time during manufacture.
- an optical element according to the present invention has an optical function part having a fine shape on an optical surface and a flange part provided around the optical function part, and corresponds to the outer peripheral edge of the flange part.
- the outermost periphery of the fine shape is covered from the outside in the direction perpendicular to the optical axis.
- the heat insulating and heat insulating part provided on the flange part covers the outermost periphery of the fine shape provided on the optical surface from the outside in the direction perpendicular to the optical axis, so that the mold formed in the mold at the time of injection molding
- the resin introduced into the space first fills the mold space part corresponding to the resin inlet side among the heat insulation and heat insulation parts provided in the flange part, and then the mold space part corresponding to the fine shape adjacent to the heat insulation and heat insulation part Fill. And after completion of resin filling, the whole outermost periphery of a fine shape will be surrounded by the heat insulation heat retention part.
- the temperature of the mold surface portion corresponding to the fine shape is lowered. Is suppressed.
- the resin introduced into the mold surface portion corresponding to the fine shape warmed by preheating in the mold can easily enter the concave portion of the fine transfer structure of the mold surface portion, thereby improving transferability and high accuracy.
- An optical element can be provided.
- the heat insulating and heat insulating portion is provided in an annular shape along the flange portion.
- the mold surface portion corresponding to the fine shape of the mold is preheated as a whole by the annular heat insulation and heat retaining section.
- the resin introduced into the mold surface part preheated from the entire periphery is likely to enter due to the concave portion of the fine transfer structure of the mold surface part.
- the ratio A / B is 0.25 or more and 0.85 or less with respect to the distance B in the optical axis direction from the bottom of the neck portion to the top of the heat insulating and heat retaining portion.
- the ratio A / B is 0.85 or less, the mold surface portion corresponding to the entire tip of the finest outermost shape can be removed from the outer side perpendicular to the optical axis by the molten resin that should form the heat insulating and heat retaining portion. It can be reliably covered with a sufficient margin. Further, by setting the ratio A / B to be 0.25 or more, it is not necessary to place the position of the fine shape extremely close to the neck portion. For this reason, the operation
- a relationship of C ⁇ D is established with respect to C and a distance D from the first intersection point to a second intersection point where a straight line extending in the radial direction perpendicular to the optical axis intersects the outer diameter surface of the heat insulating and heat retaining portion.
- a straight line extending in a radial direction perpendicular to the optical axis from the top end of the fine shape covered by the heat insulation and heat insulation portion intersects the inner diameter surface of the heat insulation heat insulation portion, and the straight line is heat insulation.
- the molten resin that has reached the fine-shaped portion of the optical surface surrounded by the heat insulation and heat insulation part is effectively insulated from the surroundings by the heat amount of the molten resin collected in the part corresponding to the heat insulation and heat insulation part in the mold space. As it is heated, the transferability is further improved.
- the ratio E / D is 0.65 or more and 0.85 or less.
- the ratio E / D is 0.85 or less, the mold space portion corresponding to the heat insulating and warming portion is filled before the mold space portion corresponding to the fine shape, and the ratio E / D is 0. Since it is .65 or more, the molten resin is filled in the mold space corresponding to the heat insulation and heat retaining part, and then the molten resin is also cooled and solidified in the mold part corresponding to the fine shape to suppress the tendency to seal. However, quick filling is performed.
- the angle ⁇ formed by the inner diameter surface of the heat insulation and heat retaining portion and the optical axis is 5 ° or more and 45 ° or less.
- the angle ⁇ is set to 5 ° or more, the mold release resistance at the time of mold release can be reduced. Further, the tilt of the optical element can be suppressed by reducing the mold release resistance, and the deformation of the fine shape that occurs when the mold is released while tilted can be prevented.
- the angle ⁇ to 45 ° or less, the above-described distance C can be prevented from becoming too large, and an increase in the diameter of the optical element can be suppressed.
- FIG. 2 is a partial side sectional view for explaining a molding die for forming the lens of FIG. 1. It is a figure explaining flow path space for resin supply, and mold space for molding a lens. It is a figure explaining the optical pick-up apparatus incorporating the lens of FIG.
- the objective lens 10 shown in FIG. 1 is made of plastic, and includes a circular optical function part 11 having an optical function, and an annular flange part 12 provided radially outward from the outer edge of the optical function part 11. Since the objective lens 10 has a symmetrical shape around the optical axis OA, only half of the objective lens 10 is shown and the remaining illustration is omitted.
- This objective lens 10 is an objective lens with NA of 0.75 or more.
- the objective lens 10 is, for example, a two-wavelength compatible type single objective lens.
- the objective lens 10 can read or write optical information corresponding to the BD (Blu-Ray Disc) standard with a wavelength of 405 nm and NA of 0.85.
- the objective lens 10 is a DVD (Digital) with a wavelength of 655 nm and NA of 0.65.
- Versatile Disc and optical information corresponding to one of the standards of CD of NA of 0.53 at a wavelength of 780 nm can be read or written.
- the optical function unit 11 of the objective lens 10 has a convex first optical surface OS1 with a large curvature on the front side and a slightly convex second optical surface OS2 on the back side.
- the first optical surface OS1 is disposed closer to the reading or writing laser light source when the objective lens 10 is incorporated into the optical pickup device and operated.
- the second optical surface OS2 is disposed to face a BD or the like that is an optical information recording medium when the objective lens 10 is incorporated in an optical pickup device and operated.
- the first optical surface OS1 is provided with a fine shape FS that is a diffractive structure.
- the fine shape FS is formed in a concentric annular zone, and the outermost periphery thereof reaches a position near the outer edge of the optical function unit 11.
- the apex Pa of the outermost peripheral projection P of the fine shape FS is arranged closer to the optical information recording medium side, that is, closer to the second optical surface OS2 than the top surface 12a of the flange portion 12 in the optical axis OA direction.
- the flange portion 12 of the objective lens 10 includes an annular neck portion 13 provided at the boundary with the optical function portion 11 and an annular projection portion 14 provided on the radially outer side of the neck portion 13.
- the inner neck portion 13 is a relatively thin portion
- the outer protrusion portion 14 is a relatively thick portion.
- the outer protruding portion 14 protrudes closer to the laser light source side, that is, the first optical surface OS1 side than the constricted portion 13, and heat insulation and heat insulation that suppresses cooling of the transfer surface of the optical function unit 11 when the objective lens 10 is injection molded. It functions as a part.
- a ring-shaped plane EP is formed on the laser light source side of the neck portion 13, that is, on the first optical surface OS 1 side.
- the protruding portion 14 is disposed on the opposite side of the inner surface 14a with the inner surface 14a facing the fine shape FS of the optical function unit 11 and the top surface 12a. And an outer diameter surface 14b.
- the inner diameter surface 14a extends with an inclination with respect to the optical axis OA, and has a tapered shape that widens on the laser light source side.
- the outer diameter surface 14b extends parallel to the optical axis OA and has a cylindrical shape.
- the optical information recording medium side that is, the second optical surface OS2 side of the entire flange portion 12 is a flat surface 12b extending perpendicular to the optical axis OA.
- the surface 12b has, for example, a flat surface that regularly reflects collimated light, and is used when the objective lens 10 is aligned.
- the illustrated mold 40 includes a movable mold 41 as a first mold and a fixed mold 42 as a second mold.
- the movable mold 41 is driven by the mold opening / closing drive device 51 and can move forward and backward in the AB direction, and can be opened / closed with the fixed mold 42.
- a mold space for injection molding can be formed as will be described in detail below by clamping the molds 41 and 42 together with the parting surfaces PS1 and PS2.
- the mold space CV corresponds to the shape of the objective lens 10 shown in FIG.
- the flow path space FC is a space corresponding to the runner RP of the molded product before the objective lens 10 is separated
- the gate portion GS is a space corresponding to the gate GP of the molded product. In the objective lens 10 shown in FIG. 1, the gate portion GS is completely removed by finishing.
- the mold space CV includes a main body space CV1 and a flange space CV2.
- the first and second transfer surfaces S1 and S2 that define the main body space CV1 form the first and second optical surfaces OS1 and OS2 of the central main optical function unit 11 of the objective lens 10, respectively. This corresponds to the end faces of core dies 64a and 74a described later.
- the first transfer surface S1 is deeper than the second transfer surface S2 and has a larger curvature.
- a mold surface portion S11 corresponding to the fine shape FS of the objective lens 10 is provided on the first transfer surface S1.
- the movable mold 41 on the movable side includes a mold plate 61 that forms the parting surface PS ⁇ b> 1, a receiving plate 62 that supports the mold plate 61 from behind, and an attachment plate that supports the receiving plate 62 from behind.
- an outer peripheral mold 64b as a peripheral part that forms the mold space CV (particularly the flange space CV2).
- the movable mold 41 has a projecting pin 65 that projects and releases the runner RA of the molded product before separating the objective lens 10, a movable rod 67a that pushes the core mold 64a from the back, and a projecting pin 65 from the back.
- a movable rod 67b to be pushed and an advancing / retracting member 68 for moving the movable rods 67a and 67b back and forth are provided.
- the core mold 64a is driven by the moving movable rod 67a to move forward to the fixed mold 42 side, and automatically retracts and returns to the original position as the movable rod 67a moves backward.
- the ejecting pin 65 is driven by the moving movable rod 67b to move forward to the fixed mold 42 side, and automatically retracts and returns to the original position as the movable rod 67b moves backward.
- the advancing / retracting member 68 is driven by the advancing / retreating drive device 52 and moves forward and backward in the AB direction at an appropriate timing and amount.
- a mold plate 61 which is a mold part on the mold surface side, includes a runner recess 61b that forms the runner RP shown in FIG. 1, a gate recess 61c that forms the gate GP, an outer peripheral mold 64b, and a protruding pin. Through holes 61e and 61f provided for inserting 65 and 66 are provided.
- the fixed mold 42 on the fixed side forms a mold plate 71 that forms the parting surface PS2, a mounting plate 72 that supports the mold plate 71 from behind, and a mold space CV (particularly a main body space CV1) shown in FIG.
- a core die 74a as a mold insert and an outer peripheral die 74b as a peripheral part forming a mold space CV (particularly, a flange space CV2) are provided.
- a mold plate 71 which is a mold part on the mold surface side is inserted with a runner recess 71b for forming the runner RP shown in FIG. 1, a gate surface 71c for forming the gate GP, and an outer peripheral mold 74b. And a through hole 71e provided for this purpose.
- the distance A in the optical axis OA direction from the bottom plane EP of the neck portion 13 to the apex Pa of the outermost peripheral projection P of the fine shape FS, and the bottom surface EP of the neck portion 13 correspond to the top of the heat insulation and heat retaining portion.
- the relationship with the distance B in the direction of the optical axis OA to the top surface 12a of the protruding portion 14 to be considered is considered.
- the ratio A / B of these distances is set to 0.25 or more and 0.85 or less.
- the mold surface portion corresponding to the outermost protrusion P of the fine shape FS in the mold surface portion S11 is a molten resin for forming the protrusion portion 14 during injection molding.
- the ratio A / B is 0.25 or more, the position of the outermost peripheral projection P of the fine shape FS does not have to be arranged extremely close to the neck portion 13.
- the work of processing the fine transfer structure FT corresponding to the fine shape FS on the mold surface portion S11 of the core die 64a becomes easy, or the tip of the core die 64a is processed when the fine transfer structure FT corresponding to the fine shape FS is processed. Can be made difficult to break.
- the thickness E corresponds to a value obtained by subtracting the distance B, which is the amount of protrusion compared to the constricted portion 13, from the total thickness F of the protruding portion 14.
- the ratio E / D of these distances is set to 0.65 or more and 0.85 or less.
- the ratio E / D By setting the ratio E / D to 0.85 or less, during injection molding, it melts into the recess R2 of the flange space CV2 corresponding to the protruding portion 14 before the mold space portion corresponding to the fine shape FS in the main body space CV1. Resin is filled, and the preheating effect of the mold surface portion S11 can be enhanced.
- the ratio E / D to be 0.65 or more, the molten resin tends to be cooled and solidified and sealed in the constricted portion 13 after the molten resin is filled into the recess R2 of the flange space CV2 corresponding to the protruding portion 14. In the main body space CV1, the mold space corresponding to the fine shape FS can be quickly filled.
- the angle ⁇ formed by the inner diameter surface 14a of the protruding portion 14 and the optical axis OA is set to 5 ° to 45 ° in the present embodiment.
- the angle ⁇ is set to 5 ° or more, the mold release resistance when the objective lens 10 is released can be reduced. Further, the tilt of the objective lens 10 can be suppressed by reducing the mold release resistance, and deformation of the fine shape FS that occurs when the mold is released while tilted can be prevented.
- the angle ⁇ to 45 ° or less the above-described distance C can be prevented from becoming too large, and an increase in the diameter of the objective lens 10 can be suppressed.
- the movable mold 41 and the fixed mold 42 are appropriately heated by a mold temperature controller (not shown). Thereby, the temperature of the mold part that forms the mold space CV in both molds 41 and 42 is set to a temperature state suitable for molding.
- the mold opening / closing drive device 51 is operated, the movable mold 41 is advanced to the fixed mold 42 side to be in the mold closed state, and the closing operation of the mold opening / closing drive device 51 is further continued.
- the mold is clamped to clamp the fixed mold 42 with a necessary pressure.
- the molten resin is injected into the mold space CV between the clamped movable mold 41 and the fixed mold 42 with a necessary pressure through the gate portion GS or the like. Let the injection to inject. After the molten resin is introduced into the mold space CV, the molten resin in the mold space CV is gradually cooled by heat dissipation, so that the molten resin is solidified with the cooling and waits for completion of molding.
- the mold opening / closing drive device 51 is operated to move the movable mold 41 backward and perform mold opening to separate the movable mold 41 from the fixed mold 42.
- the objective lens 10 which is a molded product, is released from the fixed mold 42 while being held by the movable mold 41.
- the advancing / retreating drive device 52 is operated to cause the objective lens 10 to be ejected by the core die 64a and the ejection pin 65 via the movable rods 67a and 67b.
- the objective lens 10 is urged by the movable rod 67a or the like and pushed out toward the fixed mold 42, and the objective lens 10 is released from the movable mold 41.
- the objective lens 10 released from both molds 41 and 42 is carried out of the molding apparatus by gripping a sprue portion extending from the runner RP of the objective lens 10. Further, the objective lens 10 after being carried out is subjected to external processing such as removal of the gate GP to be a product for shipment.
- FIG. 4 is a diagram schematically showing a configuration of an optical system of an optical pickup device incorporating the objective lens 10 of FIG.
- laser light from each of the semiconductor lasers 81A and 81B is applied to the optical discs DB and DD (or DC), which are optical information recording media, using the compatible objective lens 10, and each optical disc DB.
- DD or DC
- DD is finally guided to the photodetectors 87A and 87B via the compatible objective lens 10.
- the optical system including the four-wavelength plates 88A and 88B, the dichroic prism 84C, the prism mirror 84D, and the like functions as an optical device for recording / reproducing information with respect to the optical discs DB and DD (DC).
- the first semiconductor laser 81A generates laser light for information reproduction of the first optical disc DB (specifically, the wavelength for BD is 405 nm), and this laser light is condensed by the objective lens 10, A spot corresponding to NA 0.85 is formed on the information recording surface MB.
- the second semiconductor laser 81B generates laser light for reproducing information of the second optical disk DD or DC (specifically, a wavelength of 655 nm for DVD or a wavelength of 780 nm for CD), and then the laser light is transmitted to the objective lens. 10 and a spot corresponding to NA 0.65 (or NA 0.53) is formed on the information recording surface MD (MC).
- the first photodetector 87A detects information recorded on the first optical disc DB (specifically, BD) as an optical signal
- the second photodetector 87A detects the second optical disc DD or DC (specifically, In this case, information recorded on a DVD or a CD is detected as an optical signal.
- the optical pickup device of FIG. 4 when reproducing the first optical disc DB, laser light having a wavelength of, for example, 405 nm is emitted from the first semiconductor laser 81A, and the emitted light beam becomes a parallel light beam by a collimator system 82A including a beam shaper and a collimator lens.
- This light beam passes through the grating 83A, the polarization beam splitter 84A, the quarter-wave plate 88A, and the like, passes through the dichroic prism 84C and the prism mirror 84D, and then onto the information recording surface MB of the first optical disc DB by the objective lens 10. Focused.
- the light beam modulated and reflected by the information bit on the information recording surface MB passes through the objective lens 10 again, enters the polarization beam splitter 84A through the dichroic prism 84C, etc., is reflected here, and is reflected by the servo lens 85A. A point aberration is given, it enters on the 1st photodetector 87A, The read signal of the information recorded on the 1st optical disk DB is obtained using the output signal.
- a change in the amount of light due to a change in the shape of the spot and a change in position on the first photodetector 87A is detected to perform focus detection and track detection.
- the actuator 91 moves the objective lens 10 in the optical axis direction so that the light beam from the first semiconductor laser 81A forms an image on the information recording surface MB of the first optical disc DB.
- the objective lens 10 is moved in a direction perpendicular to the optical axis so that the light beam from the semiconductor laser 81A is imaged on a predetermined track.
- a laser beam having a wavelength of 655 nm, for example, is emitted from the second semiconductor laser 81B, and the emitted light beam becomes a parallel light beam by the collimator system 82B.
- This light beam passes through the grating 83B, the polarizing beam splitter 84B, and the quarter-wave plate 88B, passes through the dichroic prism 84C and the prism mirror 84D, and then is recorded on the information recording surface MD of the second optical disk DD or DC by the objective lens 10. Or it is condensed on MC.
- the light beam modulated and reflected by the information bit on the information recording surface MD or MC passes through the objective lens 10 again, enters the polarization beam splitter 84B via the dichroic prism 84C, etc., and is reflected here and reflected by the servo lens 85B. Is provided with astigmatism, and is incident on the second photodetector 87B, and a read signal of information recorded on the second optical disc DD or DC is obtained using the output signal.
- a spot shape change on the second optical detector 87B and a light quantity change due to a position change are detected, and focus detection and track detection are performed.
- the objective lens 10 is moved for tracking.
- the second semiconductor laser 81B is a two-wavelength type laser diode and the objective lens 10 is a three-wavelength compatible type, a three-wavelength compatible optical pickup device can be obtained.
- the protruding portion 14 provided on the flange portion 12 covers the outermost periphery of the fine shape FS from the outside in the direction perpendicular to the optical axis OA.
- the resin introduced into the mold space CV formed in the mold at the time of molding first fills the mold space portion corresponding to the resin inlet side among the projecting portions 14 provided in the flange portion 12, and then the projecting portions 14.
- the mold space corresponding to the fine shape FS adjacent to is filled. Then, after the resin filling is completed, the entire outermost periphery of the fine shape FS is surrounded by the protruding portion 14.
- the mold surface portion S11 for transferring the fine shape FS in the movable mold 41 With the resin accumulated in the mold space (specifically, the recess R2) corresponding to the protruding portion 14 in this way, The temperature drop of the mold surface portion S11 corresponding to the fine shape FS is suppressed. As a result, the resin introduced into the mold surface portion S11 corresponding to the fine shape FS warmed by the preheating is likely to enter the concave portion of the fine transfer structure FT corresponding to the fine shape FS of the mold surface portion S11.
- the objective lens 10 can be improved.
- the shape of the mold space CV provided in the injection mold composed of the fixed mold 42 and the movable mold 41 is not limited to that shown in the figure as long as the entire outermost periphery of the fine shape FS is surrounded by the protruding portion 14.
- Various shapes can be used. That is, the shape of the mold space CV formed by the core molds 64a and 74a is merely an example, and can be appropriately changed according to the purpose of the objective lens 10 and other optical elements.
- the use of the objective lens 10 is not limited to interchangeability, and may be, for example, BD alone. Further, the use of the objective lens 10 is not limited to the optical pickup device, and may be an imaging lens or the like.
- the shape of the protruding portion 14 provided on the flange portion 12 of the objective lens 10 does not have to be symmetrical around the optical axis OA, and for example, the thickness F may partially change.
- the fine shape FS formed in the optical function unit 11 of the objective lens 10 is not limited to the one shown in the figure, and various diffractive structures or the like according to applications can be used.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
11 光学機能部
12 フランジ部
12a 頂面
13 クビレ部分
14 突起部分
14a 内径面
14b 外径面
40 成形金型
41 可動金型
42 固定金型
51 型開閉駆動装置
52 進退駆動装置
61,71 型板
63,72 取付板
64a,74a コア型
68 進退部材
81A,81B 半導体レーザ
84A,84B 偏光ビームスプリッタ
84C ダイクロイックプリズム
87A,87B 光検出器
91 アクチュエータ
CV 型空間
CV1 本体空間
CV2 フランジ空間
FC 流路空間
FS 微細形状
GP ゲート
I1 第1の交点
I2 第2の交点
OA 光軸
OS1,OS2 光学面
P 突起
Pa 頂点
PS1,PS2 パーティング面
S1,S2 転写面
S11 型面部
Claims (7)
- 光学面に微細形状を設けた光学機能部と、前記光学機能部の周囲に設けられるフランジ部とを有し、前記フランジ部の外周縁に対応する部位から型空間内に導入された樹脂によって射出成形される光学素子であって、
前記フランジ部は、前記光学面側に突出する断熱保温部を有し、
前記断熱保温部は、前記光学面に設けられた微細形状の最外周を光軸に垂直な方向の外側から覆うことを特徴とする光学素子。 - 前記断熱保温部は、前記フランジ部に沿って環状に設けられていることを特徴とする請求項1に記載の光学素子。
- 前記フランジ部のうち前記光学機能部との境界に設けられたクビレ部分の底から前記断熱保温部によって覆われる微細形状の先端頂点までの光軸方向の距離Aと、前記クビレ部分の底から前記断熱保温部の頂部までの光軸方向の距離Bとに関して、比A/Bは、0.25以上0.85以下であることを特徴とする請求項2に記載の光学素子。
- 前記断熱保温部によって覆われる微細形状の最外周の先端頂点から光軸に直角な半径方向に延びる直線が前記断熱保温部の内径面と交差する第1交点までの距離Cと、前記第1交点から光軸に直角な半径方向に延びる直線が前記断熱保温部の外径面と交差する第2交点までの距離Dとに関して、C<Dの関係が成り立つことを特徴とする請求項2に記載の光学素子。
- 前記断熱保温部によって覆われる微細形状の先端頂点から光軸に直角な半径方向に延びる直線が前記断熱保温部の内径面と交差する第1交点から、前記直線が前記断熱保温部の外径面で交差する第2交点までの距離Dと、前記フランジ部のうち前記光学機能部との境界に設けられたクビレ部分の光軸方向の肉厚Eとに関して、E<Dの関係が成り立つことを特徴とする請求項2に記載の光学素子。
- 比E/Dは、0.65以上0.85以下であることを特徴とする請求項5に記載の光学素子。
- 前記断熱保温部の内径面と光軸とのなす角度θは、5°以上45°以下であることを特徴とする請求項1から請求項6までのいずれか一項に記載の光学素子。
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CN2010800424085A CN102548724A (zh) | 2009-09-30 | 2010-08-23 | 光学元件 |
JP2011534141A JPWO2011040148A1 (ja) | 2009-09-30 | 2010-08-23 | 光学素子 |
US13/498,507 US20120182625A1 (en) | 2009-09-30 | 2010-08-23 | Optical Element |
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JP (1) | JPWO2011040148A1 (ja) |
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WO (1) | WO2011040148A1 (ja) |
Cited By (1)
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JPWO2014050537A1 (ja) * | 2012-09-27 | 2016-08-22 | コニカミノルタ株式会社 | 光通信用のレンズ、光通信モジュール及び成形金型 |
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JP2012250510A (ja) * | 2011-06-06 | 2012-12-20 | Seiko Epson Corp | 射出成形金型、射出成形品及び射出成形方法 |
JP6179522B2 (ja) * | 2012-09-18 | 2017-08-16 | コニカミノルタ株式会社 | 成形金型、光学素子の製造方法、及び光学素子 |
CN113442380A (zh) * | 2021-06-21 | 2021-09-28 | 江西晶超光学有限公司 | 注塑模具 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH05131505A (ja) * | 1992-05-19 | 1993-05-28 | Ricoh Co Ltd | 射出成形品 |
JP2005132002A (ja) * | 2003-10-31 | 2005-05-26 | Konica Minolta Opto Inc | 光学素子 |
JP2006150902A (ja) * | 2004-12-01 | 2006-06-15 | Enplas Corp | 光学素子および光学素子成形用金型ならびに光学素子の製造方法 |
JP2007245685A (ja) * | 2006-03-20 | 2007-09-27 | Matsushita Electric Ind Co Ltd | 光学素子成形金型および光学素子 |
JP2007326371A (ja) * | 2007-08-20 | 2007-12-20 | Konica Minolta Holdings Inc | 光学素子製造方法及び光学素子製造用金型 |
-
2010
- 2010-08-23 JP JP2011534141A patent/JPWO2011040148A1/ja active Pending
- 2010-08-23 US US13/498,507 patent/US20120182625A1/en not_active Abandoned
- 2010-08-23 CN CN2010800424085A patent/CN102548724A/zh active Pending
- 2010-08-23 WO PCT/JP2010/064156 patent/WO2011040148A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH05131505A (ja) * | 1992-05-19 | 1993-05-28 | Ricoh Co Ltd | 射出成形品 |
JP2005132002A (ja) * | 2003-10-31 | 2005-05-26 | Konica Minolta Opto Inc | 光学素子 |
JP2006150902A (ja) * | 2004-12-01 | 2006-06-15 | Enplas Corp | 光学素子および光学素子成形用金型ならびに光学素子の製造方法 |
JP2007245685A (ja) * | 2006-03-20 | 2007-09-27 | Matsushita Electric Ind Co Ltd | 光学素子成形金型および光学素子 |
JP2007326371A (ja) * | 2007-08-20 | 2007-12-20 | Konica Minolta Holdings Inc | 光学素子製造方法及び光学素子製造用金型 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JPWO2014050537A1 (ja) * | 2012-09-27 | 2016-08-22 | コニカミノルタ株式会社 | 光通信用のレンズ、光通信モジュール及び成形金型 |
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JPWO2011040148A1 (ja) | 2013-02-28 |
US20120182625A1 (en) | 2012-07-19 |
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