WO2012133464A1 - 撮像レンズユニット及びその製造方法 - Google Patents
撮像レンズユニット及びその製造方法 Download PDFInfo
- Publication number
- WO2012133464A1 WO2012133464A1 PCT/JP2012/058020 JP2012058020W WO2012133464A1 WO 2012133464 A1 WO2012133464 A1 WO 2012133464A1 JP 2012058020 W JP2012058020 W JP 2012058020W WO 2012133464 A1 WO2012133464 A1 WO 2012133464A1
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- WIPO (PCT)
- Prior art keywords
- lens
- filter
- mold
- lens unit
- imaging lens
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/006—Filter holders
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- 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
- B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/022—Mountings, adjusting means, or light-tight connections, for optical elements for lenses lens and mount having complementary engagement means, e.g. screw/thread
Definitions
- the present invention relates to an imaging lens unit in which a lens or the like is incorporated in a holder and a manufacturing method thereof.
- the imaging lens unit incorporated in a mobile phone or the like is required to be downsized and thin as the mobile phone has been downsized and thinned in recent years, but there is also a strong demand for higher accuracy. Therefore, it is necessary to make the lens unit itself small, but there is a conflicting problem that the optical lens itself is made as large as possible in order to improve the optical performance. In order to solve these problems, miniaturization of the holder becomes important.
- a conventional imaging lens unit has a structure in which an optical lens is embedded in a holder so as to hold it from the periphery.
- an IR cut filter is disposed between the lens and the imaging device. Yes.
- the IR cut filter is assembled by fixing the lens unit to the lens unit holder using an adhesive after the lens unit is molded.
- the area to which the adhesive is applied decreases as the size of the camera module becomes smaller, making it difficult to reliably fix the camera module.
- the present invention has been made in view of the problems of the background art described above, and provides a small and high-performance imaging lens unit having an IR cut filter that is securely assembled while avoiding complicated processes. Objective.
- Another object of the present invention is to provide a method for manufacturing a small and high-performance imaging lens unit having the IR cut filter as described above.
- An imaging lens unit includes (a) a lens, (b) a filter, (c) a holder that holds the lens and the filter therein, and (d) a lens and the filter that are arranged between the lens and the lens. And a sealing portion that seals the internal space sandwiched between the filters.
- a sealing portion is provided between the lens and the filter, and a sealing portion that seals the internal space sandwiched between the lens and the filter is provided, so that the resin flows between the lens and the filter. It is possible to integrally mold the holder in which the lens and the filter are assembled while preventing them. Thus, by integrally molding the holder with the lens and the filter assembled, the imaging lens unit can be further reduced in size, and the number of parts and the number of assembly steps can be reduced.
- the sealing portion has a contact surface that is in close contact with the filter frame surface facing the lens of the filter.
- the internal space is sealed using the filter frame surface.
- the sealing portion is formed integrally with the lens.
- the sealing portion can be formed along with the lens, and the manufacturing and assembling process can be simplified.
- the sealing portion is formed separately from a different material with respect to the lens. In this case, it becomes easy to make a sealing part into the shape and function suitable for the objective.
- the sealing portion has a contact surface that is in close contact with the lens frame surface facing the filter of the lens.
- the inner space is sealed using the lens frame surface.
- the sealing portion has a positioning portion for aligning the lens and the filter.
- the filter can be accurately positioned with respect to the lens by the sealing portion, and the optical performance of the imaging lens unit can be improved.
- the positioning portion is a fitting portion provided with a step.
- the filter and the lens can be accurately positioned in a space-saving manner.
- a plurality of lenses are held inside the holder.
- the optical performance of the imaging lens unit can be enhanced by a plurality of lenses.
- the plurality of lenses have positioning portions for aligning the plurality of lenses with each other. In this case, the alignment of the plurality of lenses in the holder is ensured.
- the holder is formed of at least one of LCP (Liquid Crystal Polymer) resin and PPA (Polyphthalamide) resin.
- LCP and PPA are excellent in heat resistance and chemical resistance.
- the imaging lens unit of the present invention does not require fixing with an adhesive, and it is preferable to use LCP or PPA, which is generally difficult to fix with an adhesive.
- the filter is formed by forming a filter film that blocks infrared rays on a substrate formed of a glass material. That is, the filter is an IR cut filter.
- the manufacturing method of the imaging lens unit according to the present invention includes a lens, a filter, and a holder that holds the lens and the filter therein, and the lens and the filter are formed by the first mold and the second mold. And holding a molding space around the lens and the filter, and molding the holder member holding the lens and the filter by filling the molding space with a resin and solidifying it.
- the holder member holding the lens and the filter is molded by filling the resin in the molding space and solidifying, so the holder in a state where the lens and the filter are assembled is integrally molded. be able to.
- the imaging lens unit can be further reduced in size, and the number of parts and the number of assembly steps can be reduced.
- a sealing for sealing an internal space sandwiched between the lens and the filter between the lens and the filter Place the stop. In this case, it is possible to prevent the resin from flowing between the lens and the filter when integrally forming the holder in a state where the lens and the filter are assembled.
- the lens in the manufacturing method described above, is held in the first mold before the first mold and the second mold are closed to form a molding space.
- the filter is held in the second mold.
- the lens and the filter can be appropriately combined by closing and clamping the first and second molds.
- At least one of the first mold and the second mold has a displacement mechanism for adjusting the position of at least one of the lens and the filter in the mold opening / closing direction.
- a displacement mechanism for adjusting the position of at least one of the lens and the filter in the mold opening / closing direction.
- At least one of the first mold and the second mold has a fixing mechanism for adsorbing at least one of the lens and the filter with a negative pressure for holding.
- the lens and the filter are supported with an appropriate force with respect to the first mold and the second mold before or during the mold closing of the first mold and the second mold.
- At least one of the first mold and the second mold has a positioning holding portion that positions the mold when holding at least one of the lens and the filter.
- the lens and the filter can be precisely aligned via the first and second molds.
- the lens and the filter are mounted while being positioned on at least one of the first mold and the second mold in the mold open state using the mounting jig.
- workability at the time of attaching a lens and a filter to the 1st metallic mold and the 2nd metallic mold can be improved, and the combination accuracy with a lens and a filter can be raised simply.
- the lens and the filter are attached to at least one of the first mold and the second mold in a state where they are temporarily assembled.
- the combination of the lens and the filter can be accurately performed in advance.
- the first lens is held in the first mold and the second lens and the filter are held in the second mold in order to hold the first lens and the second lens inside the holder.
- the first mold and the second mold are clamped to bring the first lens and the second lens into contact with each other.
- the first lens, the second lens, and the filter can be precisely aligned and fixed in the holder.
- the holder is formed of at least one of an LCP resin and a PPA resin.
- FIG. 1A is a side sectional view showing the structure of the imaging lens unit according to the first embodiment
- FIG. 1B is a perspective view of the imaging lens unit.
- It is a flowchart explaining the manufacture procedure of the imaging lens unit shown in FIG.
- It is sectional drawing explaining the set of the optical member and IR cut filter to the metal mold
- It is sectional drawing explaining after the removal of an insert jig
- FIG. 8A is a diagram illustrating an imaging lens unit and a manufacturing method thereof according to the second embodiment
- FIG. 8B is a diagram illustrating a modification of the imaging lens unit and the like of FIG. 8A. It is a figure explaining the imaging lens unit of 3rd Embodiment, and its manufacturing method. It is a figure explaining the imaging lens unit of 4th Embodiment. It is a figure explaining the manufacturing method of the imaging lens unit of 4th Embodiment.
- the imaging lens unit 100 includes a block-shaped optical member 10, a plate-shaped IR cut filter 12, and a case-shaped holder that integrally stores the optical member 10 and the IR cut filter 12. 40.
- the optical member 10 is, for example, cut out from a lens wafer (wafer-like base material) in which a large number of lenses are arranged by dicing, has a square-view outline, and has a quadrangular prism-like side surface. is doing.
- the optical member 10 includes a lens 11 as a main body having an optical function, and a sealing portion 14 interposed between the lens 11 and the IR cut filter 12, and the lens 11 and the sealing portion 14 are integrated. To be a single member.
- the lens 11 of the optical member 10 has a lens body 11a having a circular outline provided in the central part around the optical axis OA and a frame part 11b having a rectangular outline extending around the lens body 11a.
- the lens body 11a is, for example, an aspherical lens unit, and has first and second optical surfaces 11d and 11e.
- the sealing part 14 is a square cylindrical member having the optical axis OA in the axial direction.
- the sealing part 14 is connected to the frame part 11b of the optical member 10 and integrated with the optical member 10 on the upper end side as described above.
- the sealing part 14 has the cyclic
- the inner surface 14i of the sealing portion 14 is covered with a light shielding coating.
- the sealing unit 14 serves as a positioning unit that prevents the tilt of the IR cut filter 12 and adjusts the distance from the lens 11 to the IR cut filter 12.
- the sealing portion 14 has a role of sealing the internal space IS sandwiched between the lens 11 and the IR cut filter 12. That is, the sealing portion 14 prevents the resin from flowing between the lens 11 inserted into the holder 40 and the IR cut filter 12 when the holder 40 described later is formed. 12 can be insert-molded so as to face each other.
- the optical member 10 is formed of a curable resin having reflow heat resistance, for example.
- a curable resin include a thermosetting resin, a photocurable resin, and a radiation curable resin.
- the optical member 10 does not need to be entirely formed of a resin, and may have a structure in which, for example, a glass plate is sandwiched between resin molded bodies or resin layers. In this case, the entire main surface of the glass plate may be covered with the resin molded body, but the center of the main surface of the glass plate may be covered with the resin molded body.
- the IR cut filter 12 is cut out from, for example, a sheet-like filter plate by dicing, and has a rectangular outline in plan view.
- the IR cut filter 12 is a filter film that shields infrared rays on a light-transmitting substrate made of, for example, a glass material, and has reflow heat resistance.
- the IR cut filter 12 includes a circular contour filter main body 12a provided at the center around the optical axis OA, and a rectangular contour frame 12b extending around the filter main body 12a.
- the filter body 12a has a pair of first and second planes 12d and 12e that are substantially parallel through which the light beam from the lens 11 passes.
- the IR cut filter 12 is supported by the sealing portion 14 in the frame portion 12 b and has a contact surface (filter frame surface) 12 f that contacts the contact surface 14 e of the sealing portion 14.
- the substrate of the IR cut filter 12 is not limited to glass but can be formed of a curable resin having reflow heat resistance.
- the IR cut filter 12 is not limited to a filter film formed on a substrate, but may be an antireflection film formed thereon, and may be configured to shield infrared rays from the entire substrate.
- the holder 40 for integrally storing the optical member 10 and the IR cut filter 12 is formed of a thermoplastic resin having reflow heat resistance (for example, LCP, PPA, etc.), and has an upper portion 41 having a rectangular plate-like contour, A rectangular column-shaped storage for fitting and holding the optical member 10 and the IR cut filter 12 therein is provided with a bottom portion 42 having a rectangular frame-shaped contour and a side wall portion 43 having a rectangular cylindrical contour. A space HS is formed. As will be described in detail later, the holder 40 is integrally formed by resin injection molding and formed as an integral single member.
- a thermoplastic resin having reflow heat resistance for example, LCP, PPA, etc.
- the heat-resistant imaging lens unit 100 can be processed in the reflow process. It becomes.
- the upper part 41 of the holder 40 faces the upper frame surface 11f of the optical member 10 held in the storage space HS and restricts the upward movement of the optical member 10 along the optical axis OA.
- the bottom 42 faces the second frame surface 12g on the lower side of the IR cut filter 12 and restricts the downward movement of the IR cut filter 12 along the optical axis OA.
- the side wall portion 43 faces the four side surfaces 10c of the optical member 10, the side surface 12c of the IR cut filter 12, and the like, and restricts movement in the lateral direction perpendicular to the optical axis OA of the optical member 10 and the IR cut filter 12. .
- the holder 40 which is a single member is in close contact with the optical member 10 and the like at the upper portion 41 and the side wall portion 43 and is in close contact with the IR cut filter 12 at the bottom portion 42, the optical member 10 and the IR cut are attached.
- the filter 12 can be stably held from the surroundings while preventing mutual displacement.
- a circular opening OP1 is formed at the center of the upper portion 41, and an annular edge portion 40i surrounding the opening OP1 only faces the periphery of the optical surface 11d of the optical member 10 and supports the optical surface 11d. And is arranged so as to shield the periphery of the optical surface 11d. Thereby, the edge part 40i is functioning also as a kind of aperture_diaphragm
- a rectangular opening OP2 is also formed in the bottom portion 42, and an annular edge portion 40j surrounding the opening OP2 faces the periphery of the second frame surface 12e of the IR cut filter 12 and supports the periphery of the frame portion 12b. is doing.
- the surface excluding the finally exposed optical surface 11 d and the region in the vicinity of the optical surface 11 d that is in contact with the mold when the holder 40 is molded is used for injection molding of the holder 40. Since the resin comes into contact with the liquid resin before solidification, the inner surface 40e of the upper portion 41 of the holder 40 and the inner surface of the side wall portion 43 with respect to the frame surface 11f and the side surface 10c of the optical member 10 due to the solidification of the resin. 40g is in a welded state with no gaps.
- the optical member 10 is made of resin.
- the surface of the frame surface 11f of the optical member 10 and the inner surface 40e of the upper portion 41 of the holder 40 are softened by the heat during the injection molding of the holder 40.
- the IR cut filter 12 is formed of an inorganic material
- the second frame surface 12g of the IR cut filter 12 and the inner surface 40f of the bottom 42 of the holder 40 are not welded, but the frame portion 12b of the IR cut filter 12 is
- the holder 40 is fitted in a groove 40s formed at the boundary between the side wall 43 and the bottom 42 and is fixed in a stable state.
- a sealing portion 14 is provided between the lens 11 and the IR cut filter 12 and seals the internal space IS sandwiched between them.
- the holder 40 in a state where the lens 11 and the IR cut filter 12 are assembled can be formed while preventing the fluid resin from flowing between the IR cut filter 12 and the molding of the holder 40.
- the imaging lens unit 100 can be further downsized while maintaining the size of the lens 11. The number of points and assembly man-hours can be reduced.
- the imaging lens unit 100 is required to be downsized and assumed to be mounted on a final product such as an imaging device. It will be easier to meet the appearance specifications. As a result, the deterioration of the dimensional accuracy due to deformation at the time of mold release is suppressed when the holder 40 and the IR cut filter 12 are integrally molded, rather than when the holder 40 is molded alone. Furthermore, since the holder 40 is in close contact with the periphery of the optical member 10, generation of ghosts and flares can be suppressed.
- the lens 11 and the IR cut filter 12 are connected in the high-temperature mold device 50 when the holder 40 is molded, the air contracts after molding, and the air in the internal space IS expands during reflow and the holder 40 Etc. can be prevented from being deformed.
- a mold apparatus 50 including a first mold 51 and a second mold 52 is appropriately operated to open both molds 51 and 52, and the first on the left side of the drawing.
- a first insert jig (first attachment jig) 70 holding the optical member 10 in advance is temporarily fixed to the first molding portion 61 provided in the mold 51 in an aligned state. That is, a set for attaching the first insert jig 70 to the first molding portion 61 of the first mold 51 is performed (the first half of step S11 in FIG. 2).
- the first molding part 61 which is a target for setting the first insert jig 70, is provided so as to be recessed from the parting surface 51a of the first mold 51, and a recess part RE1 is formed.
- the optical member 10 held by the set first insert jig 70 is supported in an aligned state in the recess RE1.
- the first mold 51 includes a main body 53a having a parting surface 51a and a mounting plate 53b for supporting the main body 53a from the back.
- the aforementioned first molding part 61 is formed on the inner side of the main body 53a facing the second mold 52, and a holding part 55 for supporting the optical member 10 is formed in association with the first molding part 61.
- the holding portion 55 is provided with a suction tube 51 d that communicates with the center of the bottom surface of the holding portion 55 in order to suck the optical member 10 received from the first insert jig 70.
- the suction pipe 51d can be sucked to the outside at an appropriate timing by a drive mechanism attached to the mold apparatus 50, and the space S1 adjacent to the lens body 11a of the lens 11 is exhausted through the suction pipe 51d.
- the pressure can be reduced or negative.
- the suction tube 51d functions as a fixing mechanism for the optical member 10.
- die 51 from the back, etc. are provided in the 1st metal mold
- the first insert jig (first attachment jig) 70 is remotely driven by a control drive device (not shown) to temporarily hold and transport the optical member 10.
- the first insert jig 70 includes a main body 71, a support portion 72 that supports the sealing portion 14 of the optical member 10, and a plurality of fitting pins 76 for positioning the optical member 10 with respect to the first mold 51. And have.
- the step bottom surface 72 a provided in the concave portion 72 c of the support portion 72 aligns the optical member 10 in the axis AX direction via the sealing portion 14, and the step side surface 72 b provided in the concave portion 72 c of the support portion 72 corresponds to the sealing portion 14.
- the optical member 10 is aligned in a direction perpendicular to the axis AX.
- the support portion 72 is formed with a suction pipe 72d that communicates with the center of the bottom surface of the recess 72c.
- the suction tube 72d can be sucked to the outside at an appropriate timing by a drive mechanism attached to the first insert jig 70, and is adjacent to the lens 11 of the optical member 10 held by the first insert jig 70.
- the optical member 10 can be sucked and fixed to the concave portion 72 c of the support portion 72 with a desired suction force.
- the decompression of the space V1 may be stopped or the space V1 may be pressurized.
- the fitting pin 76 is used for positioning when the first insert jig 70 is set with respect to the first mold 51, and is fitted to the plurality of fitting holes 65 provided in the main body 53 a of the first mold 51. To do. Thereby, the optical axis OA of the optical member 10 held by the first insert jig 70 and the axis AX of the first molding portion 61 of the first mold 51 can be made to substantially coincide with each other easily.
- the optical member 10 is brought to a target position close to the holding portion 55 provided in the first molding portion 61. Can be moved. In this state, pressure reduction of the suction pipe 51d of the holding portion 55 provided in the first mold 51 is started, and the pressure reduction by the suction pipe 72d of the first insert jig 70 is stopped to switch to the released state in which the fixation is released. As a result, the optical member 10 is passed from the support portion 72 of the first insert jig 70 to the holding portion 55 of the first mold 51, and is fixed with accuracy using the holding portion 55.
- the alignment part which consists of the fitting pin 76 and the fitting hole 65 is provided in two or more places.
- the alignment portion is not provided in the same longitudinal section, and the upper fitting pin 76 and the fitting hole 65 are indicated by dotted lines.
- the holding portion 55 for fixing the optical member 10 includes a cylindrical protrusion 61d.
- the protrusion 61d supports the optical member 10 in the direction of the optical axis OA as a positioning member and is perpendicular to the optical axis OA.
- an inclined surface 11j as a bent portion is provided so as to surround the optical surface 11d, and on the upper end side of the protrusion 61d of the holding portion 55, A contact plane 61j that faces the frame portion 11b and a contact slope 61k that faces the slope 11j are provided (see an enlarged view in FIG. 3).
- the contact inclined surface 61k of the protrusion 61d is in contact with the inclined surface 11j of the lens body 11a, thereby precisely matching the axis AX of the first molding unit 61 with the optical axis OA of the lens 11.
- the protrusion 61d of the holding portion 55 also has a role of preventing the flowing resin MP from flowing into the space S1 adjacent to the optical surface 11d of the lens 11 during molding described later (see FIG. 6).
- the end surfaces 61j and 61k of the projection 61d and the optical surface 11d of the lens 11 are slightly separated from each other. It is desirable. Thereby, damage to the optical surface 11d of the lens 11 can be reliably prevented.
- the optical member 10 is positioned with respect to the first mold 51 by holding the contact surface facing the inclined portion (curved portion) 11k in the region outside the effective region within the optical surface 11d of the lens body 11a. It may be realized by forming the projection 61d of 55 and abutting the abutting surface on the inclined portion (curved portion) 11k. In this case, the surface on which the optical surface 11d of the lens body 11a is formed can be used, and it is not necessary to separately provide the slope 11j and the like as described above outside the optical surface 11d for positioning.
- the first insert jig 70 is removed from the first mold 51 (see FIG. 4).
- a second insert jig (second attachment jig) holding an IR cut filter in advance with respect to the second molding portion 62 provided in the second mold 52 on the right side of the drawing.
- Temporarily fix 80 in an aligned state That is, a set for attaching the second insert jig 80 to the second molding portion 62 of the second mold 52 is performed (the first half of step S12 in FIG. 2).
- the second molding part 62 which is the target for setting the second insert jig 80, is provided so as to be recessed from the parting surface 52a of the second mold 52, and a recess part RE2 is formed.
- the IR cut filter 12 held by the second insert jig 80 in the set state is supported in an aligned state in the recess part RE2.
- the second mold 52 includes a main body 54a having a parting surface 52a and a mounting plate 54b for supporting the main body 54a from the back.
- the above-described second molding portion 62 is formed on the inner side of the main body 54a facing the first mold 51, and is a holding portion for supporting the IR cut filter 12 accompanying the second molding portion 62.
- the fixing member 56 is embedded, and a resin injection portion 52r extending from the second molding portion 62 to the periphery along the parting surface 52a is provided.
- the fixing member (holding portion) 56 is embedded so as to fit into a hole 54d formed in the main body 54a of the second mold 52, and the back surface of the fixing member 56 is attached to the mounting plate 54b via an elastic body 57. It is supported.
- Each part of the first mold 51 and the second mold 52 other than the elastic body 57 is formed of a hard material such as metal or ceramics.
- the elastic body 57 can be formed of an elastic material made of rubber or other resin, but can also be formed of an elastic member such as a spring.
- the fixing member 56 and the elastic body 57 function as a displacement mechanism that allows a thickness error of the IR cut filter 12 and the optical member 10.
- the fixing member 56 and the elastic body 57 are provided with a suction pipe 52d penetrating therethrough.
- the suction pipe 52d can be sucked to the outside at an appropriate timing by a drive mechanism attached to the mold device 50.
- the suction tube 52d functions as a fixing mechanism for the IR cut filter 12.
- the second mold 52 is provided with a heating mechanism for heating the second mold 52, a platen for pressing the second mold 52 from the back, and the like. The illustration is omitted.
- the second insert jig (second attachment jig) 80 is remotely driven by a control drive device (not shown) to temporarily hold and carry the IR cut filter 12.
- the second insert jig 80 includes a main body 81, a support portion 82 that supports the IR cut filter 12, and a plurality of fitting pins 86 for positioning the IR cut filter 12 with respect to the second mold 52. .
- the support surface 82a provided in the recess 82c of the support portion 82 aligns the IR cut filter 12 in the axis AX direction.
- the support portion 82 is formed with a suction pipe 82d communicating with the center of the bottom surface of the recess 82c.
- the suction pipe 82d can be sucked and exhausted to the outside at an appropriate timing by a drive mechanism attached to the second insert jig 80, and the first cut of the IR cut filter 12 held by the second insert jig 80 is provided.
- the IR cut filter 12 By reducing the pressure on the flat surface 12d side, the IR cut filter 12 can be sucked and fixed to the recess 82c of the support portion 82 with a desired suction force.
- the suction pipe 82d may be depressurized or may be pressurized.
- the fitting pin 86 is used for positioning when the second insert jig 80 is set with respect to the second mold 52, and is fitted to a plurality of fitting holes 66 provided in the main body 54 a of the second mold 52. To do. Further, the IR cut filter 12 is brought close to the fixing member 56 provided in the second molding portion 62 by bringing the reference surface 81a of the second insert jig 80 into close contact with the parting surface 52a of the second mold 52. Can be moved to. In this state, the decompression of the suction pipe 52d provided in the fixing member 56 provided in the second mold 52 is started, and the decompression by the suction pipe 82d of the second insert jig 80 is stopped and the release is released.
- the IR cut filter 12 is passed and fixed from the support portion 82 of the second insert jig 80 to the fixing member 56 of the second mold 52. That is, the IR cut filter 12 is attached or set to the second molding portion 62 (the second half of step S12 in FIG. 2).
- the alignment part which consists of the fitting pin 86 and the fitting hole 66 is provided in two or more places. In the illustrated example, the alignment portion is not provided in the same longitudinal section, and the upper fitting pin 86 and the fitting hole 66 are indicated by dotted lines.
- the fixing member 56 for fixing the IR cut filter 12 has a cylindrical protrusion 62d, and the protrusion 62d supports the IR cut filter 12 in alignment with the optical axis OA direction as a positioning member.
- the protrusion 62d of the fixing member 56 also has a role of preventing the flowing resin MP from flowing into the space S2 adjacent to the second flat surface 12e of the IR cut filter 12 during molding described later (see FIG. 6).
- the second insert jig 80 is removed from the second mold 52 (see FIG. 4).
- the first mold 51 and the second mold 52 are brought close to each other to perform clamping so that the first mold 51 and the second mold 52 are placed between the first mold 51 and the second mold 52.
- a cavity CA is formed by connecting the recess part RE1 of the molding part 61 and the recess part RE2 of the second molding part 62 (step S15 in FIG. 2).
- the first molding part 61 provided in the first mold 51 and the second molding part 62 provided in the second mold 52 are joined.
- the first molding portion 61 is formed with a transfer surface 61a for molding the upper surface 40a of the holder 40 shown in FIG.
- transfer surfaces 62b and 62c for forming the back surface 40b and the outer peripheral side surface 40c of the holder 40 shown in FIG. 1 are formed in the second molding portion 62 on the second mold 52 side.
- the first molding part 61 is formed with a holding part 55 having a cylindrical projection 61d and supporting the optical member 10
- the second molding part 62 on the second mold 52 side has a cylinder.
- a fixing member 56 is provided which has a projection 62d and supports the IR cut filter 12. The fixing member 56 is elastically minutely displaceable in a direction perpendicular to the parting surface 52a.
- the optical member 10 supported on the first molding part 61 side and the IR cut filter 12 supported on the second molding part 62 side are in close contact with each other, and the optical member 10 and the IR cut filter 12 are formed in the cavity CA. And are held stably.
- the contact surface 14e of the sealing portion 14 of the optical member 10 and the contact surface 12f of the IR cut filter 12 are in close contact with each other with an appropriate pressure.
- an internal space IS that is sealed between the optical member 10 and the IR cut filter 12 and that prevents inflow of resin or the like is formed.
- the frame surface 11f and the side surface 10c of the optical member 10 and the IR cut filter are filled by filling the cavity CA, which is a molding space, with the fluid resin MP to be the material of the holder 40.
- the 12 second planes 12g and the like are each covered with resin.
- the holder 40 is shape
- the lens 11 and the IR cut filter 12 are housed and fixed in the holder 40 in a state where the optical member 10 and the IR cut filter 12 are supported between the openings OP1 and OP2 of the holder 40 as shown in FIG.
- the imaging lens unit 100 is completed.
- the holding portion 55 and the fixing member 56 provided in the first and second molding portions 61 and 62 prevent the fluid resin MP from flowing into the spaces S1 and S2, thereby opening the openings OP1 and OP2 in the holder 40.
- the suction from the suction pipes 51d and 52d is stopped and the decompression of the spaces S1 and S2 is finished.
- the suction may be stopped when the fluid resin MP is filled in the cavity CA, or the suction may be continued until the resin is solidified.
- the suction is continued until the resin is solidified, it is possible to reliably prevent the resin from entering the first optical surface 11d and the second flat surface 12e around the openings OP1 and OP2 that are sensitive to leakage of the fluid resin MP.
- the second mold 52 is retracted by opening the mold to separate the second mold 52 and the first mold 51 from each other (step S ⁇ b> 17 in FIG. 2), and the molded product remains.
- the imaging lens unit 100 is projected and released using an unillustrated ejector pin or the like provided on the first mold 51 or the second mold 52, thereby completing the first mold 51 or the second mold 52.
- the imaging lens unit 100 as a product can be taken out (step S18 in FIG. 2).
- An injection trace portion 48 extends from the imaging lens unit 100 in correspondence with the shape of the resin injection portion 52r.
- the implantation trace portion 48 is removed in a subsequent finishing process. If a submarine gate (not shown) is used, the injection trace portion 48 can be removed at the time of mold release by protrusion.
- the imaging lens unit 100 and the manufacturing method thereof according to the first embodiment described above the internal space IS disposed between the lens 11 and the IR cut filter 12 and sealed between the lens 11 and the IR cut filter 12 is sealed.
- the sealing part 14 to stop is provided, and the holder 40 in a state in which the lens 11 and the IR cut filter 12 are assembled while preventing the flowing resin MP from flowing between the lens 11 and the IR cut filter 12.
- the imaging lens unit and the manufacturing method thereof according to the second embodiment will be described. Note that the imaging lens unit and the manufacturing method thereof according to the second embodiment are obtained by partially changing the imaging lens unit 100 and the like of the first embodiment, and parts that are not particularly described are the same as those of the first embodiment. Shall.
- an imaging lens unit 100 includes a lens 211, an IR cut filter 12, a sealing portion 14 interposed between the lens 11 and the IR cut filter 12, and these. And a case-like holder 40 for storing the case. That is, in the case of this embodiment, the lens 11 and the sealing part 14 are separate bodies. In this case, the shape of the sealing part 14 and the freedom degree of material can be raised.
- the first mold 51 can be formed only by the first insert jig 70.
- a member in which the lens 11 and the sealing portion 14 are connected to the first molding portion 61 can be integrally attached.
- the sealing portion 14 is separate from the lens 11, it can be formed of the same material as the lens 11, but can also be formed of a material different from that of the lens 11.
- the sealing portion 14 functions as a diaphragm by providing, for example, a light shielding property.
- the sealing portion 14 is formed of glass, resin, metal, or the like.
- the sealing portion 14 functions as a diaphragm, for example, the inner surface 14i of the sealing portion 14 can be subjected to a light-shielding coating process.
- the IR cut filter 12 has an opening OP2 of the sealing portion 14. It is fixed so as to be embedded in a stepped portion 14s provided on the outer periphery on the side.
- the IR cut filter 12 can be connected to the stepped portion 14s by using press fitting or the like, and can be temporarily assembled to the sealing portion 14 or the like. That is, the step portion 14 s of the sealing portion 14 constitutes a fitting portion that functions as a positioning portion for the IR cut filter 12.
- the sealing part 14 and the IR cut filter 12 can be connected without using an adhesive, and the second molding of the second mold 52 is performed as a member connecting the IR cut filter 12 and the sealing part 14.
- the unit 62 can be set.
- the imaging lens unit and the manufacturing method thereof according to the third embodiment will be described below. Note that the imaging lens unit and the manufacturing method thereof according to the third embodiment are obtained by partially changing the imaging lens unit 100 and the like of the first embodiment, and parts that are not particularly described are the same as those of the first embodiment. Shall.
- the optical member 10 and the IR cut filter 12 included in the imaging lens unit 100 of the second embodiment are held in a first insert jig 70 in a state of being connected in advance, and the first mold 51 is set in the first molding part 61.
- a step portion 14s is formed on the outer periphery of the sealing portion 14 provided on the optical member 10 on the opening side, and the IR cut filter 12 is fixed so as to be embedded in the step portion 14s.
- the IR cut filter 12 can be temporarily assembled by connection utilizing fitting to the stepped portion 14s. That is, the step 14 s of the sealing portion 14 of the optical member 10 constitutes a fitting portion that functions as a positioning portion for the IR cut filter 12.
- the optical member 10 and the IR cut filter 12 can be connected without using an adhesive, and the first molding portion 61 of the first mold 51 is a member connecting the optical member 10 and the IR cut filter 12. Can be set. That is, in the case of this embodiment, the second insert jig 80 shown in FIG.
- the boundary between the sealing portion 14 of the optical member 10 and the frame portion 12b of the IR cut filter 12 can be covered with resin, as in the case of the second embodiment shown in FIG. 8B.
- the optical member 10 and the IR cut filter 12 are firmly fitted and connected, and the sealing function of the fluid resin MP is enhanced.
- the imaging lens unit and the manufacturing method thereof according to the fourth embodiment will be described. Note that the imaging lens unit and the manufacturing method thereof according to the fourth embodiment are obtained by partially changing the imaging lens unit 100 and the like of the first embodiment, and parts that are not particularly described are the same as those of the first embodiment. Shall.
- the imaging lens unit 100 includes a first optical member 10A, a second optical member 10B, an IR cut filter 12, and a holder 40.
- the first and second optical members 10A and 10B have substantially the same structure as the optical member 10 of FIG. 1A. That is, the first optical member 10 ⁇ / b> A includes the lens 11 and the sealing portion 14, and the second optical member 10 ⁇ / b> B also includes the lens 11 and the sealing portion 14.
- the lens 11 of the first optical member 10A and the lens 11 of the second optical member 10B have different optical surface shapes.
- the sealing portion 14 of the first optical member 10A is interposed between the lens 11 of the first optical member 10A and the lens 11 of the second optical member 10B, and seals the second optical member 10B.
- the stop portion 14 is interposed between the lens 11 of the second optical member 10B and the IR cut filter 12.
- a step 14s is formed on the outer periphery of the sealing portion 14 provided on the second optical member 10B on the opening side, and the IR cut filter 12 is fixed so as to be embedded in the step 14s.
- the boundary of the sealing part 14 of the 2nd optical member 10B and the frame part 12b of IR cut filter 12 can be covered with resin similarly to the case of 2nd Embodiment shown to FIG. 8B.
- the second optical member 10B and the IR cut filter 12 can be connected without using an adhesive, and the second mold 52 of the second mold 52 can be connected as a member connecting the optical member 10 and the IR cut filter 12. 2 can be set in the molding part 62.
- the first and second optical members 10A and 10B do not need to be entirely formed of resin, and may have a structure in which, for example, a glass plate is sandwiched between resin molded bodies.
- the internal space IS1 is secured by the one sealing portion 14 between the lens 11 of the first optical member 10A and the lens 11 of the second optical member 10B, and the second optical member.
- An internal space IS2 is secured between the lens 11 of the member 10B and the IR cut filter 12 by the other sealing portion 14.
- a mutual positioning structure is formed between the sealing portion 14 of the first optical member 10A and the lens 11 of the second optical member 10B.
- a slope 11j is provided on the outer peripheral surface of the lens 11 of the second optical member 10B so as to surround the optical surface 11d, and the contact surface 14e of the sealing portion 14 of the first optical member 10A is provided. Is provided with a contact slope 14k facing the slope 11j.
- the contact slope 14k provided on the sealing portion 14 of the first optical member 10A functions as a positioning portion for the second optical member 10B. Even if there is no mutual positioning structure between the sealing portion 14 of the first optical member 10A and the lens 11 of the second optical member 10B, the fitting provided in the second insert jig 80 and the second mold 52 is provided. These positioning can also be performed by performing precise positioning with a joint hole or the like.
- the second optical member 10 ⁇ / b> B and the IR cut filter 12 are held in the second insert jig 80 in a state of being connected in advance, and are set in the second molding portion 62 of the second mold 52.
- the IR cut filter 12 is temporarily assembled to the step portion 14s of the second optical member 10B by connection using fitting, and the optical member 10B and the IR cut filter 12 are connected. As a member, it is set in the second molding part 62 of the second mold 52.
- the second insert jig 80 supports the second optical member 10B on the holding portion 85 while sucking the second optical member 10B with a negative pressure from the suction pipe 82d.
- the holding portion 85 has a cylindrical protrusion 85d, and the lens 11 of the second optical member 10B is moved to the optical axis in the same manner as the protrusion 61d of the holding portion 55 provided on the first mold 51. It can be aligned and supported in a direction perpendicular to OA and a direction along optical axis OA.
- the optical members 10, 10A, 11B, the IR cut filter 12 and the like have been described as rectangular in plan view.
- the optical members 10, 10A, 11B and the IR cut filter 12 can be circular in plan view.
- the entire imaging lens unit 100 can be formed in a cylindrical shape, but can also be formed in a rectangular column shape.
- the optical members 10, 10A, 11B, the lens 11 and the like shown in FIGS. 1A, 8A, 10 and the like are made of resin.
- these are made to be hybrid optical elements or lenses.
- the hybrid optical element or lens is, for example, a wafer lens or lens wafer in which a resin layer having an optical function is formed on one or both surfaces of a transparent substrate made of glass or resin. It means what was cut out from.
- IR cut filter 12 only one IR cut filter 12 is included.
- an imaging lens unit 100 of a type incorporating a plurality of filters having different functions may be used.
- the dimension of the IR cut filter 12 in the direction perpendicular to the optical axis OA and the dimension of the optical members 10, 10A, 11B in the direction perpendicular to the optical axis OA are not particularly limited. If the difference is large, it is necessary to devise a support method and pressure resistance during molding.
- the fixing member 56 is provided in the second mold 52 and the fixing member 56 is supported by the elastic body 57.
- Such an elastic adjustment mechanism is used as the holding portion 55 of the first mold 51. It can also be provided. Further, if the accuracy of clamping by the first and second molds 51 and 52 and the shape and size of the optical member 10 are precise, the fixing member 56 of the second mold 52 is fixed so as not to be displaced by the elastic body 57. It can also be. Furthermore, instead of the elastic body 57, a replaceable spacer having a different thickness can be disposed.
- the protrusion 61d of the holding portion 55 is not limited to a cylindrical shape, and may be a columnar or truncated cone-like protrusion having a surface shape following the optical surface 11d of the optical member 10 at the top.
- the protrusion 62d of the fixing member 56 is not limited to a cylindrical one, and may be a columnar or truncated cone protrusion having a flat top surface that follows the second plane 12e of the IR cut filter 12. it can.
- the first mold 51 and the second mold 52 are placed horizontally, but a vertical mold apparatus 50 that moves them apart in the vertical direction can also be used.
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Abstract
Description
以下、図面を参照して、本発明の第1実施形態に係る撮像レンズユニットの構造やその製造方法について説明する。
以下、第2実施形態に係る撮像レンズユニット及びその製造方法を説明する。なお、第2実施形態に係る撮像レンズユニット及びその製造方法は、第1実施形態の撮像レンズユニット100等を一部変更したものであり、特に説明しない部分は、第1実施形態と同様であるものとする。
以下、第3実施形態に係る撮像レンズユニット及びその製造方法を説明する。なお、第3実施形態に係る撮像レンズユニット及びその製造方法は、第1実施形態の撮像レンズユニット100等を一部変更したものであり、特に説明しない部分は、第1実施形態と同様であるものとする。
以下、第4実施形態に係る撮像レンズユニット及びその製造方法を説明する。なお、第4実施形態に係る撮像レンズユニット及びその製造方法は、第1実施形態の撮像レンズユニット100等を一部変更したものであり、特に説明しない部分は、第1実施形態と同様であるものとする。
Claims (21)
- レンズと、
フィルターと、
前記レンズと前記フィルターとを内部に保持するホルダーと、
前記レンズと前記フィルターとの間に配置され、前記レンズと前記フィルターとに挟まれた内部空間を封止する封止部と
を備える撮像レンズユニット。 - 前記封止部は、前記フィルターの前記レンズに対向するフィルター枠面に密着する当接面を有する、請求項1に記載の撮像レンズユニット。
- 前記封止部は、前記レンズと一体に形成されている、請求項2に記載の撮像レンズユニット。
- 前記封止部は、前記レンズに対して異なる材料で別体に形成されている、請求項2に記載の撮像レンズユニット。
- 前記封止部は、前記レンズの前記フィルターに対向するレンズ枠面に密着する当接面を有する、請求項4に記載の撮像レンズユニット。
- 前記封止部は、前記レンズと前記フィルターとをアライメントする位置決め部を有する、請求項1から5までのいずれか一項に記載の撮像レンズユニット。
- 前記位置決め部は、段差を設けた嵌合部である、請求項6に記載の撮像レンズユニット。
- 前記ホルダーの内部に複数のレンズが保持されている、請求項1から7までのいずれか一項に記載の撮像レンズユニット。
- 前記複数のレンズは、当該複数のレンズを互いにアライメントするための位置決め部を有する、請求項8に記載の撮像レンズユニット。
- 前記ホルダーは、LCP樹脂及びPPA樹脂の少なくとも一方で形成されている、請求項1から9までのいずれか一項に記載の撮像レンズユニット。
- 前記フィルターは、ガラス材料で形成された基板上に赤外線を遮光するフィルター膜が形成されたものである、請求項1から10までのいずれか一項に記載の撮像レンズユニット。
- レンズと、フィルターと、前記レンズと前記フィルターとを内部に保持するホルダーとを備える撮像レンズユニットの製造方法であって、
第1の金型と第2の金型とによって前記レンズと前記フィルターとを保持するとともに、前記レンズ及び前記フィルターの周囲に成形空間を形成する工程と、
前記成形空間内に樹脂を充填して固化させることにより、前記レンズ及び前記フィルターを内部に保持した前記ホルダー部材を成形する工程と
を備える撮像レンズユニットの製造方法。 - 前記レンズ及び前記フィルターの周囲に成形空間を形成する際に、前記レンズと前記フィルターとの間に前記レンズと前記フィルターとに挟まれた内部空間を封止する封止部を配置する、請求項12に記載の撮像レンズユニットの製造方法。
- 前記第1の金型と前記第2の金型とを型閉じして前記成形空間を形成する前に、前記レンズを第1の金型に保持させるとともに、前記フィルターを第2の金型に保持させる、請求項12及び13のいずれか一項に記載の撮像レンズユニットの製造方法。
- 前記第1の金型と前記第2の金型との少なくとも一方に、前記レンズと前記フィルターとの少なくとも一方の型開閉方向に関する位置を調整するための変位機構を有する、請求項12から14までのいずれか一項に記載の撮像レンズユニットの製造方法。
- 前記第1の金型と前記第2の金型との少なくとも一方に、前記レンズと前記フィルターとの少なくとも一方を保持のため負圧によって吸着させる固定機構を有する、請求項12から15までのいずれか一項に記載の撮像レンズユニットの製造方法。
- 前記第1の金型と前記第2の金型との少なくとも一方に、前記レンズと前記フィルターとの少なくとも一方を保持する際に金型に対する位置決めを行う位置決め保持部を有する、請求項12から16までのいずれか一項に記載の撮像レンズユニットの製造方法。
- 取り付け治具を用いて、型開き状態の前記第1の金型と前記第2の金型との少なくとも一方に前記レンズと前記フィルターとを位置決めしつつ取り付ける、請求項12から17までのいずれか一項に記載の撮像レンズユニットの製造方法。
- 前記レンズと前記フィルターとを、仮組した状態で前記第1の金型と前記第2の金型との少なくとも一方に取り付ける、請求項12から18までのいずれか一項に記載の撮像レンズユニットの製造方法。
- 前記ホルダーの内部に第1レンズと第2レンズとを保持するため、前記第1の金型に前記第1レンズを保持させ、前記第2の金型に前記第2レンズと前記フィルターとを仮組したものを保持させ、前記第1の金型と前記第2の金型とを型締めして前記第1レンズと前記第2レンズとを当接させる、請求項12から19までのいずれか一項に記載の撮像レンズユニットの製造方法。
- 前記ホルダーは、LCP樹脂及びPPA樹脂の少なくとも一方で形成されている、請求項12から20までのいずれか一項に記載の撮像レンズユニットの製造方法。
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JP2013507642A JP5910628B2 (ja) | 2011-03-28 | 2012-03-27 | 撮像レンズユニットの製造方法 |
US14/007,184 US9632277B2 (en) | 2011-03-28 | 2012-03-27 | Image pickup lens unit and manufacturing method thereof |
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