WO2022209927A1 - マイクロレンズアレイ、マイクロレンズアレイを用いた車両用灯具、およびマイクロズアレイの製造方法 - Google Patents
マイクロレンズアレイ、マイクロレンズアレイを用いた車両用灯具、およびマイクロズアレイの製造方法 Download PDFInfo
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- WO2022209927A1 WO2022209927A1 PCT/JP2022/012101 JP2022012101W WO2022209927A1 WO 2022209927 A1 WO2022209927 A1 WO 2022209927A1 JP 2022012101 W JP2022012101 W JP 2022012101W WO 2022209927 A1 WO2022209927 A1 WO 2022209927A1
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- Prior art keywords
- side lens
- microlens array
- lens portion
- refractive index
- exit
- Prior art date
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
-
- 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
- B29C33/424—Moulding surfaces provided with means for marking or patterning
-
- 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
- B29C45/16—Making multilayered or multicoloured articles
- B29C45/1615—The materials being injected at different moulding stations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
- F21S41/265—Composite lenses; Lenses with a patch-like shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
- F21S41/27—Thick lenses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
- F21S41/275—Lens surfaces, e.g. coatings or surface structures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
- F21S41/322—Optical layout thereof the reflector using total internal reflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
- G02B3/0031—Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
-
- 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
- B29C2045/0094—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor injection moulding of small-sized articles, e.g. microarticles, ultra thin articles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
- F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/30—Semiconductor lasers
Definitions
- the present disclosure relates to a microlens array, a vehicle lamp using the microlens array, and a method for manufacturing the microlens array.
- Japanese Laid-Open Patent Publication No. 2002-100003 discloses a configuration in which light emitted from a light source unit is emitted through a microlens array (hereinafter also referred to as "MLA") toward the front of the lamp, thereby forming a desired light distribution pattern.
- MLA microlens array
- a light shielding plate for defining the shape of each of a plurality of light source images formed by a plurality of condensing lens portions is provided between a rear lens array and a front lens array. It has A low-beam light distribution pattern having a cutoff line is formed by blocking part of the light emitted from the light source unit by the light shielding plate. In such a vehicle lamp, part of the light emitted from the light source is blocked by the light shielding plate and is not emitted forward of the lamp, and there is room for improvement in light utilization efficiency.
- An object of the present disclosure is to provide a microlens array with high light utilization efficiency, a vehicle lamp using the microlens array, and a method of manufacturing the microlens array.
- a microlens array includes: A microlens array having a plurality of optical systems, each of the optical systems includes a pair of an incident-side lens section and an exit-side lens section; A hollow portion is provided between the incident surface of the incident-side lens portion and the exit surface of the exit-side lens portion, The cavity is including a first surface extending to the focal position of the exit-side lens portion, and a second surface extending from the first surface in the direction of the entrance surface, A cutline forming portion is configured by a boundary portion between the first surface and the second surface.
- a microlens array includes: A resin-molded microlens array comprising a plurality of optical systems, each of the optical systems has a pair of an incident side lens portion and an exit side lens portion; A low refractive index portion is provided between the entrance surface of the entrance-side lens portion and the exit surface of the exit-side lens portion, The refractive index of the low refractive index portion is lower than the refractive index of other portions, The low refractive index portion is a first surface extending through the focal point of the exit surface and a second surface extending from the first surface to the entrance surface; A cutline forming portion is configured by a boundary portion between the first surface and the second surface.
- a vehicle lamp according to an aspect of the present disclosure includes: a light source; and the microlens array described above.
- a method for manufacturing a microarray includes: A method for manufacturing a microlens array having an incident side lens portion, an exit side lens portion, and a low refractive index portion, comprising: contacting the first mold and the second mold to form a first cavity; a step of injecting a molten first resin into the first cavity and curing the first resin in the first cavity to form one of the incident side lens portion and the exit side lens portion; The second mold is separated from the first mold while one of the entrance-side lens portion and the exit-side lens portion is held, and the first mold and the third mold are brought into contact with each other to form a second mold.
- a two-cavity injecting a molten second resin into the second cavity and curing the second resin in the second cavity to form a low refractive index portion;
- the third mold is separated from the first mold while holding one of the entrance-side lens portion and the exit-side lens portion and the low refractive index portion, and the first mold and the fourth mold are separated from each other. abutting to form a third cavity; a step of injecting a molten third resin into the third cavity and curing the third resin in the third cavity to form the other of the incident-side lens portion and the exit-side lens portion; prepared,
- the cured second resin has a lower refractive index than the cured first resin and the cured third resin.
- microlens array with high light utilization efficiency, a vehicle lamp using the microlens array, and a method of manufacturing the microlens array.
- FIG. 1 is a schematic cross-sectional view of a vehicle lamp according to a first embodiment of the present disclosure
- FIG. 2 is a perspective view of the microlens array shown in FIG. 1
- FIG. 2 is a side view of the microlens array shown in FIG. 1
- FIG. FIG. 4 is a schematic diagram showing the first surface of the cavity of the microlens array
- FIG. 5A is a diagram showing an example of a method for manufacturing a microlens array according to the first embodiment of the present disclosure
- 6 is a view showing a modification of the method of manufacturing the microlens array shown in FIG. 5
- FIG. Fig. 2 is a schematic cross-sectional view of a vehicle lamp according to a second embodiment of the present disclosure
- FIG. 10A to 10D are explanatory diagrams of steps of a method for manufacturing the microlens array of FIG. 9;
- FIG. 10A to 10D are explanatory diagrams of steps of a method for manufacturing the microlens array of FIG. 9;
- FIG. 10A to 10D are explanatory diagrams of steps of a method for manufacturing the microlens array of FIG. 9;
- FIG. 10A to 10D are explanatory diagrams of steps of a method for manufacturing the microlens array of FIG. 9;
- FIG. 10A to 10D are explanatory diagrams of steps of a method for manufacturing the microlens array of FIG. 9;
- FIG. 10A to 10D are explanatory diagrams of steps of a method for manufacturing the microlens array of FIG. 9;
- FIG. 10A to 10D are explanatory diagrams of steps of a method for manufacturing the microlens array of FIG. 9;
- FIG. 10A to 10D are explanatory diagrams of steps of
- the scale has been changed as appropriate to make each member recognizable.
- the "left”, “right”, “front”, “rear”, “up”, and “down” directions shown in the drawings are relative directions set for convenience of explanation.
- the term “front-rear direction” includes a “forward direction” and a “rearward direction.”
- a “left-right direction” is a direction including a “left direction” and a “right direction.”
- the “vertical direction” is a direction including “upward direction” and “downward direction”.
- FIG. 1 is a schematic cross-sectional view of a vehicle lamp 1 according to the first embodiment of the present disclosure.
- a vehicle lamp 1 includes an outer cover 2 and a housing 3 .
- a lamp chamber 8 is formed by the outer cover 2 and the housing 3 .
- a light source 5 , a primary lens 6 and a microlens array 4 are provided in the lamp chamber 8 .
- the light source 5 is mounted on a substrate 51 supported by the housing 3 and directed forward.
- Light emitted from the light source 5 passes through the primary lens 6 and the microlens array 4 and is emitted forward of the vehicle lamp 1 .
- a virtual straight line extending in the longitudinal direction of the vehicle lamp 1 from the center point of the light emitting surface of the light source 5 will be referred to as the main optical axis Mx of the vehicle lamp 1 .
- the primary lens 6 converts the light emitted from the light source 5 into parallel light and makes it enter the microlens array 4 .
- a collimator lens, an aplanat lens, a Fresnel lens, or the like can be used as the primary lens 6, a collimator lens, an aplanat lens, a Fresnel lens, or the like can be used.
- the primary lens 6 shown in FIG. 1 has a first incident portion 61 provided at a position facing the light source 5, and a second incident portion 62 provided as a vertical wall surrounding the first incident portion 61. ing.
- the light B1 incident on the first incident portion 61 from the light source 5 is refracted at the first incident portion 61 so as to become parallel light with the main optical axis Mx, for example.
- the light B2 incident on the second incident portion 62 from the light source 5 is reflected by the reflecting surface 63 so as to become parallel light with the main optical axis Mx.
- the light source 5, the primary lens 6, and the microlens array 4 constitute one light source unit.
- the vehicle lamp 1 may have a plurality of light source units in the same lamp chamber 8 .
- the microlens array 4 has a plurality of optical systems 20.
- the microlens array 4 is an optical component made of, for example, a transparent resin material or glass material.
- the microlens array 4 will be described in detail below with reference to FIGS. 2 to 4.
- FIG. FIG. 2 is a perspective view of the microlens array 4 shown in FIG.
- FIG. 3 is a side view of the microlens array 4 shown in FIG.
- FIG. 4 is a schematic diagram showing the first surface 431 of the cavity 43 of the microlens array 4. As shown in FIG.
- each optical system 20 is adjacent in a direction orthogonal to the light emitting direction (main optical axis Mx: optical axis Ax of the incident side lens portion 41), and each optical system 20 are integrated. Since a plurality of lens components are integrated as a single microlens array 4, the positioning accuracy of each optical system 20 is high. In addition, handling such as carrying is easy.
- the size of the optical system 20 is arbitrary, it is preferably about 0.5 to 6.0 mm square when viewed from the front in the irradiation direction.
- each optical system 20 includes an incident side lens portion 41, an exit side lens portion 42, and a hollow portion 43, which are provided in a pair.
- the optical system 20a includes a portion of the entrance-side lens portion 41 including the entrance surface 41a, a portion of the exit-side lens portion 42 including the exit surface 42a, and a hollow portion 43a.
- the optical systems 20b and 20c are same applies to the optical systems 20b and 20c.
- the incident-side lens portion 41 is provided closer to the primary lens 6 than the hollow portion 43 is.
- the exit-side lens portion 42 is provided closer to the outer cover 2 than the hollow portion 43 is.
- the incident-side lens portion 41 and the exit-side lens portion 42 are provided on a common optical axis Ax and face each other.
- the optical axis Ax of each optical system 20 is parallel to the main optical axis Mx of the vehicle lamp 1 .
- the entrance-side lens portion 41 and the exit-side lens portion 42 each have a convex lens shape.
- Light incident on the incident side lens portion 41 of a given optical system 20 is basically configured to enter the exit side lens portion 42 belonging to the same optical system 20 .
- each optical system 20 has the same shape and size.
- the focal length of the exit-side lens portion 42 is equal to or less than the lens thickness D of the entrance-side lens portion 41 .
- the hollow portion 43 is provided between a pair of the incident-side lens portion 41 and the exit-side lens portion 42 forming one optical system 20 .
- the cavity portion 43 is a cavity penetrating the microlens array 4 in the first direction (horizontal direction in the example of FIG. 2). According to this configuration, it is possible to collectively form the hollow portion 43 for each of the optical systems 20 arranged along the first direction, which contributes to the reduction of the manufacturing cost and the time required for manufacturing.
- the cavity 43 may be a sealed closed area or an unsealed open area.
- the hollow portions 43a and 43b are open regions that are open in the horizontal direction
- the hollow portion 43c is an open region that is open in the horizontal direction and downward.
- the hollow portion 43 has a first surface 431 extending to the focal position f of the output-side lens portion, and a second surface 432 extending from the first surface 431 toward the entrance surface of the entrance-side lens portion 41 .
- a boundary portion 433 between the first surface 431 and the second surface 432 constitutes a cutline forming portion.
- the first surface 431 is on a plane including the vertical direction and the horizontal direction.
- the second surface 432 is on a plane including the front-rear direction and the left-right direction.
- the configuration according to the present embodiment includes the hollow portion 43 having the second surface 432, the light that has entered the incident side lens portion 41 and is not incident on the outgoing side lens portion 42 as it is. can be reflected by the second surface 432 of the hollow portion 43 and made incident on the exit-side lens portion 42 . Therefore, it is possible to enhance the efficiency of light utilization.
- the path of light from the light source 5 to the exit-side lens portion 42 can be freely designed using the hollow portion 43, the shape of the entrance-side lens portion 41, the light source 5, the entrance-side lens portion 41, and the exit-side lens portion
- the degree of freedom in design such as the positional relationship with 42 can be increased.
- the manufacturing cost is lower than in the case of forming a reflecting surface by vapor-depositing metal or the like instead of the hollow portion 43 .
- the second surface 432 is preferably a total reflection surface. According to this configuration, of the light incident on the incident side lens portion 41, almost all of the light that would not enter the output side lens portion 42 as it is is reflected by the second surface 432 to be reflected by the output side lens portion 42. Since it can be made incident, the utilization efficiency of light can be further improved. In addition, it is possible to suppress the light that has reached the second surface 432 from passing through the second surface 432 and entering the adjacent optical system 20, and as a result, the generation of stray light can be reduced.
- the incident-side lens portion 41 preferably has a shape that refracts light incident from the incident surface of the incident-side lens portion 41 toward the boundary portion 433 between the first surface 431 and the second surface 432 . According to this configuration, the light incident from the incident surface of the incident-side lens portion 41 is directed to the second surface 432, which is the reflecting surface, so that the light utilization efficiency can be further enhanced. Further, it is more preferable that the incident-side lens portion 41 has a shape that converges the light incident from the incident surface of the incident-side lens portion 41 near the boundary portion 433 forming the cutline forming portion. According to this configuration, it is possible to enhance the clarity of the cut line while enhancing the light utilization efficiency. In this embodiment, the incident surface lens of the incident side lens portion 41 has a parabolic shape (aspherical/free curved surface) having a focal point in the vicinity of the cutline forming portion.
- a stepped portion 434 is preferably formed as a cutline forming portion at a boundary portion 433 between the first surface 431 and the second surface 432 . Moreover, the stepped portion 434 is preferably positioned near the rear focal point of the exit-side lens portion 42 . With this configuration, it is possible to form a low-beam light distribution pattern with a simple configuration that does not use a shade. In addition, since the low-beam light distribution pattern can be formed without using a shade, the light utilization efficiency is less likely to decrease. Note that the step portion 434 is provided in each optical system 20 . The shape of the step portion 434 can be appropriately changed according to the desired light distribution pattern.
- FIG. 5 is a diagram showing an example of a method for manufacturing the microlens array 4 according to the first embodiment of the present disclosure.
- FIG. 6 is a diagram showing a modification of the method of manufacturing the microlens array 4 shown in FIG.
- the manufacturing method shown in FIG. 5 includes steps S1 to S3.
- step S1 for example, a transparent resin or glass material is mold-molded to form a part (for example, the first surface forming the exit-side lens part 42 and the boundary part 433 of the micro-lens array 4 excluding the incident-side lens part 41). 431 and the second surface 432 are integrated).
- the component manufactured in step S1 is provided with a plurality of output-side lens portions 42 stacked vertically and horizontally, and a hollow portion 43 penetrating in the horizontal direction.
- a stepped portion 434 is provided for each exit-side lens portion 42 at the boundary portion 433 between the first surface 431 and the second surface 432 .
- step S2 for example, a component including a plurality of incident-side lens portions 41 is manufactured by mold-molding a transparent resin or glass material.
- the component manufactured in step S2 is obtained by stacking a plurality of incident-side lens portions 41 vertically and horizontally. Either step S1 or step S2 may be performed first, or may be performed simultaneously.
- step S3 the part manufactured in step S1 and the part manufactured in step S2 are bonded together with an adhesive 44.
- the adhesive 44 a transparent adhesive having the same refractive index as the material of the lens is preferable.
- the adhesive 44 for example, an acrylic transparent adhesive or the like can be used.
- the adhesive 44 it is preferable to use one having a refractive index similar to that of the material of the entrance-side lens portion 41 and the exit-side lens portion 42.
- FIG. Through these steps S1 to S3, the microlens array 4 according to this embodiment is obtained.
- the hollow portion 43 has a substantially rectangular shape when viewed from the left and right directions, but may have a substantially triangular shape as shown in FIG. 3, or other shapes. may
- the manufacturing method shown in FIG. 6 includes steps S11 to S13.
- step S11 for example, using molds M1 and M2, a transparent resin or glass material is mold-molded to manufacture a part of the microlens array 4 excluding the incident-side lens portion 41.
- the part manufactured here is the same part as the part obtained in step S11.
- step S12 only the mold M2 is removed, and the lid member 45 is inserted into the end on the side opposite to the exit-side lens portion 42 to cover it. As a result, the rearward direction of the hollow portion 43 is closed by the lid member 45 .
- the lid member 45 is preferably a component made of the same material as the entrance-side lens portion 41 and the exit-side lens portion 42 .
- step S13 the mold M3 is attached to the mold M1 as shown.
- the mold M3 is a mold for insert-molding the incident-side lens portion 41 into the part obtained in step S12.
- the microlens array 4 according to this embodiment is obtained.
- FIG. 7 is a schematic cross-sectional view of the vehicle lamp 10 according to the second embodiment of the present disclosure.
- FIG. 8 is a side view of the microlens array 14 shown in FIG. Components that are substantially the same as those of the vehicle lamp 10 according to the first embodiment are given the same reference numerals, and repetitive descriptions are omitted.
- the vehicle lamp 10 according to the second embodiment differs from the vehicle lamp 1 according to the first embodiment in the configuration of the microlens array 14 .
- the microlens array 14 includes an incident side lens portion 41 , an exit side lens portion 42 and a low refractive index portion 143 .
- the optical system 120a includes a portion of the entrance-side lens portion 41 including the entrance surface 41a, a portion of the exit-side lens portion 42 including the exit surface 42a, and a low refractive index portion. 143a and .
- the incident-side lens portion 41 and the exit-side lens portion 42 are provided on a common optical axis Ax and face each other.
- the focal length of the exit-side lens portion 42 is equal to or less than the lens thickness D of the entrance-side lens portion 41 .
- the low refractive index portion 143 is provided between a pair of the incident side lens portion 41 and the exit side lens portion 42 forming one optical system 120 .
- the incident side lens portion 41 is provided closer to the primary lens 6 than the low refractive index portion 143 is.
- the output side lens portion 42 is provided closer to the outer cover 2 than the low refractive index portion 143 is.
- the low refractive index portion 143 has a refractive index that is different from that of other portions constituting the optical system 120 (the entrance-side lens portion 41, the exit-side lens portion 42, and the portion connecting the entrance-side lens portion 41 and the exit-side lens portion 42). is configured to be lower than the refractive index of
- the low refractive index portion 143 and other portions are made of, for example, a transparent resin material or a glass material.
- the low refractive index portion 143 can be made of a material different from the material forming the other portions.
- the low refractive index portion 143 is made of acrylic resin or silicone resin, and the other portions are made of polycarbonate resin.
- the low refractive index portion 143 may be made of silicone resin, and other portions may be made of acrylic resin or cycloolefin polymer.
- the low refractive index portion 143 and other portions may be made of a combination of materials other than those described above. With this configuration, the refractive index can be changed by combining the materials of the low refractive index portion 143 and other portions, so that the low refractive index portion 143 having a refractive index different from that of the other portions can be easily formed.
- the low refractive index portion 143 penetrates the microlens array 14 in the first direction (horizontal direction in the example of FIG. 7). According to this configuration, the low refractive index portions 143 can be collectively formed for the optical systems 120 arranged along the first direction, which contributes to the reduction of the manufacturing cost and the time required for manufacturing.
- the low refractive index portion 143 includes a first surface 1431 extending through the focal point f of the exit surface of the exit-side lens portion 42 and a second surface 1431 extending from the first surface 1431 to the entrance surface of the entrance-side lens portion 41 .
- a boundary portion 1433 between the first surface 1431 and the second surface 1432 constitutes a cutline forming portion.
- the first surface 1431 is on a plane including the vertical direction and the horizontal direction.
- the second surface 1432 is on a plane including the front-rear direction and the left-right direction.
- the configuration according to the present embodiment includes the low refractive index portion 143 having the second surface 432, it is possible to obtain the same effect as the first embodiment. That is, at least part of the light incident on the incident-side lens portion 41 that would otherwise not enter the exit-side lens portion 42 is reflected by the second surface 1432 of the low-refractive-index portion 143 to be reflected by the exit-side lens. It can be made incident on the portion 42 . Therefore, it is possible to enhance the efficiency of light utilization.
- the path of light from the light source 5 to the exit side lens portion 42 can be freely designed using the low refractive index portion 143, the shape of the entrance side lens portion 41, the light source 5, the entrance side lens portion 41 and the exit side lens portion 41 can be freely designed.
- the degree of freedom in design such as the positional relationship with the lens portion 42 can be increased.
- the low refractive index portion 143 and other portions are preferably formed so that the difference in refractive index is 0.03 or more, more preferably 0.05 or more. According to this configuration, of the light that has entered the incident side lens portion 41, almost all of the light that would not otherwise enter the outgoing side lens portion 42 is reflected by the second surface 1432, and is reflected by the outgoing side lens portion 42. Since it can be made incident, the utilization efficiency of light can be further improved. In addition, it is possible to suppress the light that has reached the second surface 1432 from passing through the second surface 1432 and entering the adjacent optical system 120, and as a result, the generation of stray light can be reduced.
- the incident-side lens portion 41 preferably has a shape that refracts light incident from the incident surface of the incident-side lens portion 41 toward the boundary portion 1433 between the first surface 1431 and the second surface 1432 . According to this configuration, the light incident from the incident surface of the incident-side lens portion 41 is directed to the second surface 1432, which is the reflecting surface, so that the light utilization efficiency can be further enhanced. Further, it is more preferable that the incident-side lens portion 41 has a shape that converges the light incident from the incident surface of the incident-side lens portion 41 near the boundary portion 1433 forming the cutline forming portion. According to this configuration, it is possible to enhance the clarity of the cut line while enhancing the light utilization efficiency.
- a stepped portion 1434 is preferably formed as a cutline forming portion at a boundary portion 1433 between the first surface 1431 and the second surface 1432 . Moreover, it is preferable that the stepped portion 1434 be positioned near the rear focal point of the exit-side lens portion 42 . With this configuration, it is possible to form a low-beam light distribution pattern with a simple configuration that does not use a shade. In addition, since the low-beam light distribution pattern can be formed without using a shade, the light utilization efficiency is less likely to decrease.
- the low refractive index portion 143 may be made of an opaque material.
- the opaque material is obtained by adding a pigment to a transparent resin material or a glass material to color it. According to this configuration, even if the light that reaches the second surface 1432 passes through the second surface 1432 , the light is blocked by the low refractive index portion 143 . Accordingly, it is possible to suppress the light that has reached the second surface 1432 from passing through the second surface 1432 and enter the adjacent optical system 120, and as a result, it is possible to reduce the occurrence of stray light.
- the low refractive index portion 143 has a substantially rectangular shape when viewed in the horizontal direction, but may have a substantially triangular shape as in the first embodiment shown in FIG. It can be shaped.
- FIG. 9 is a flow chart showing an example of a method for manufacturing the microlens array 14 according to the second embodiment of the present disclosure.
- 10 to 17 are explanatory diagrams of the steps of the method of manufacturing the microlens array 14.
- FIG. In this embodiment an example in which the microlens array 14 is formed using a multicolor molding method will be described.
- a transparent resin material or glass material is mold-molded to form the exit-side lens portion 42 of the microlens array 14 .
- the first mold M11 and the second mold M12 are brought into contact with each other to form the first cavity C1 (STEP21 in FIG. 9: first cavity forming step).
- the output side lens portion 42 is formed (STEP 22 in FIG. 9: output side lens portion forming step).
- a component other than the incident side lens portion 41 and the low refractive index portion 143 from the microlens array 4 that is, the output side lens portion 42, the output side lens portion 42, and the incident side lens portion 41 are connected
- a part in which the parts are integrated is formed.
- a plurality of output-side lens portions 42 are stacked vertically and horizontally, and a portion corresponding to the low refractive index portion 143 is a cavity penetrating in the horizontal direction.
- the low refractive index portion 143 is insert-molded into the exit-side lens portion 42 obtained in the above process. Specifically, as shown in FIG. 12, the second mold M12 is separated from the first mold M11 while the exit-side lens portion 42 is held. Then, as shown in FIG. 13, the first mold M11 and the third mold M13 are brought into contact with each other to form the second cavity C2 (STEP23 in FIG. 9: second cavity forming step).
- the molten second resin R2 is injected into the second cavity C2, and the second resin R2 is cured within the second cavity C2 to form the low refractive index portion 143 ( STEP 24 in FIG. 9: low refractive index portion forming step).
- STEP 24 in FIG. 9 low refractive index portion forming step.
- a component is formed in which the low refractive index portion 143 is insert-molded in the output side lens portion 42 .
- the second resin R2 a resin having a refractive index lower than that of the first resin R1 when cured is used.
- the incident side lens portion 41 is insert-molded in the part obtained in the above process.
- the third mold M13 is separated from the first mold M11 while holding the component including the exit-side lens portion 42 and the low refractive index portion 143 .
- the first mold M11 and the fourth mold M14 are brought into contact with each other to form the third cavity C3 (STEP25 in FIG. 9: third cavity forming step).
- the molten third resin R3 is injected into the third cavity C3, and the third resin R3 is cured within the third cavity C3 to form the incident side lens portion 41 ( STEP 26 in FIG. 9: incident side lens portion forming step).
- the microlens array 14 according to the present embodiment is obtained.
- the third resin R3 a resin having a refractive index higher than that of the second resin R2 when cured is used.
- the same resin as the first resin R1 is used for the third resin R3.
- the microlens array 14 is formed by a multi-color molding (three-color molding) method. That is, the next part is insert-molded without removing the part molded in each step from the mold. This eliminates the need for assembling and adhering steps of each part, so that the microlens array 14 can be manufactured with high accuracy.
- the incident side lens portion 41 is insert-molded after the exit side lens portion 42 is formed first.
- the exit-side lens portion 42 may be insert-molded after the entrance-side lens portion 41 is formed.
- the present invention is not limited to the above-described embodiments, and can be modified, improved, etc. as appropriate.
- the material, shape, size, numerical value, form, number, location, etc. of each component in the above-described embodiment are arbitrary and not limited as long as the present invention can be achieved.
- microlens arrays 4 and 14 of the present disclosure are preferably used for vehicle lamps, they may be used for lamps for other purposes.
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Abstract
Description
複数の光学系を有するマイクロレンズアレイであって、
各々の前記光学系はそれぞれ、一対の入射側レンズ部と出射側レンズ部と、を備え、
前記入射側レンズ部の入射面と前記出射側レンズ部の出射面との間に、空洞部が設けられており、
前記空洞部は、
前記出射側レンズ部の焦点位置に延びる第一面と、前記第一面から前記入射面の方向へ延びる第二面とを含み、
前記第一面と前記第二面との境界部によってカットライン形成部が構成されている。
複数の光学系を備える樹脂成形されたマイクロレンズアレイであって、
各々の前記光学系はそれぞれ、一対の入射側レンズ部と出射側レンズ部と、を有し、
前記入射側レンズ部の入射面と前記出射側レンズ部の出射面との間に、低屈折率部が設けられており、
前記低屈折率部の屈折率がその他の部位の屈折率よりも低く、
前記低屈折率部は、
前記出射面の焦点を通って延びる第一面と、前記第一面から前記入射面へ延びる第二面とを含み、
前記第一面と前記第二面との境界部によってカットライン形成部が構成されている。
光源と、
上記のマイクロレンズアレイと、を備える。
入射側レンズ部と出射側レンズ部と低屈折率部とを有するマイクロレンズアレイを製造する方法であって、
第一金型と第二金型とを互いに当接させて第一キャビティを形成する工程と、
前記第一キャビティ内に溶融した第一樹脂を注入し、前記第一キャビティ内で前記第一樹脂を硬化させて、前記入射側レンズ部および前記出射側レンズ部の一方を形成する工程と、
前記入射側レンズ部および前記出射側レンズ部の一方を保持したまま前記第一金型から前記第二金型を離間させ、前記第一金型と第三金型とを互いに当接させて第二キャビティを形成する工程と、
前記第二キャビティ内に溶融した第二樹脂を注入し、前記第二キャビティ内で前記第二樹脂を硬化させて、低屈折率部を形成する工程と、
前記入射側レンズ部および出射側レンズ部の一方と前記低屈折率部を保持したまま前記第一金型から前記第三金型を離間させ、前記第一金型と第四金型とを互いに当接させて第三キャビティを形成する工程と、
前記第三キャビティ内に溶融した第三樹脂を注入し、前記第三キャビティ内で前記第三樹脂を硬化させて、前記入射側レンズ部および前記出射側レンズ部の他方を形成する工程と、を備え、
硬化した前記第二樹脂は、硬化した前記第一樹脂および硬化した前記第三樹脂よりも屈折率が低い。
図1は、本開示の第一実施形態に係る車両用灯具1の模式断面図である。図1に示すように車両用灯具1は、アウタカバー2とハウジング3とを備えている。アウタカバー2とハウジング3によって灯室8が形成されている。
図7は、本開示の第二実施形態に係る車両用灯具10の模式断面図である。図8は、図7に示すマイクロレンズアレイ14の側面図である。第一実施形態に係る車両用灯具10と実質的に同一の構成要素には同一の参照番号を付与し、繰り返しとなる説明は省略する。
Claims (14)
- 複数の光学系を備えるマイクロレンズアレイであって、
各々の前記光学系はそれぞれ、一対の入射側レンズ部と出射側レンズ部と、を有し、
前記入射側レンズ部の入射面と前記出射側レンズ部の出射面との間に、空洞部が設けられており、
前記空洞部は、
前記出射側レンズ部の焦点位置に延びる第一面と、前記第一面から前記入射面の方向へ延びる第二面とを含み、
前記第一面と前記第二面との境界部によってカットライン形成部が構成されている、
マイクロレンズアレイ。 - 複数の光学系を備える樹脂成形されたマイクロレンズアレイであって、
各々の前記光学系はそれぞれ、一対の入射側レンズ部と出射側レンズ部と、を有し、
前記入射側レンズ部の入射面と前記出射側レンズ部の出射面との間に、低屈折率部が設けられており、
前記低屈折率部の屈折率がその他の部位の屈折率よりも低く、
前記低屈折率部は、
前記出射面の焦点を通って延びる第一面と、前記第一面から前記入射面へ延びる第二面とを含み、
前記第一面と前記第二面との境界部によってカットライン形成部が構成されている、
マイクロレンズアレイ。 - 前記低屈折率部と前記その他の部位とが異なる材料で構成されている、請求項2に記載のマイクロレンズアレイ。
- 前記低屈折率部の屈折率と前記その他の部位の屈折率との差は0.03以上である、請求項2または請求項3に記載のマイクロレンズアレイ。
- 前記低屈折率部の屈折率と前記その他の部位の屈折率との差は0.05以上である、請求項4に記載のマイクロレンズアレイ。
- 前記低屈折率部は、不透明な材料により構成されている、請求項2から請求項5の何れか一項に記載のマイクロレンズアレイ。
- 前記複数の光学系の少なくとも一部は、第一方向に沿って並んで一体化されており、
前記低屈折率部は、前記マイクロレンズアレイを前記第一方向に貫通している、
請求項2から請求項6のいずれか一項に記載のマイクロレンズアレイ。 - 前記第二面は、全反射面である、
請求項1に記載のマイクロレンズアレイ。 - 前記複数の光学系の少なくとも一部は、第一方向に沿って並んで一体化されており、
前記空洞部は、前記マイクロレンズアレイを前記第一方向に貫通している、
請求項1または請求項8に記載のマイクロレンズアレイ。 - 前記境界部には、段差部が設けられており、
前記段差部は、前記出射側レンズ部の後方側焦点付近に位置し、前記カットライン形成部を構成する
請求項1から請求項9の何れか一項に記載のマイクロレンズアレイ。 - 前記入射側レンズ部は、前記入射面から入射した光を前記境界部に向かって屈折させる、
請求項1から請求項10のいずれか一項に記載のマイクロレンズアレイ。 - 光源と、
請求項1から請求項11のいずれか一項に記載のマイクロレンズアレイと、を備えた、車両用灯具。 - 入射側レンズ部と出射側レンズ部と低屈折率部とを有するマイクロレンズアレイを製造する方法であって、
第一金型と第二金型とを互いに当接させて第一キャビティを形成する工程と、
前記第一キャビティ内に溶融した第一樹脂を注入し、前記第一キャビティ内で前記第一樹脂を硬化させて、前記入射側レンズ部および前記出射側レンズ部の一方を形成する工程と、
前記入射側レンズ部および前記出射側レンズ部の一方を保持したまま前記第一金型から前記第二金型を離間させ、前記第一金型と第三金型とを互いに当接させて第二キャビティを形成する工程と、
前記第二キャビティ内に溶融した第二樹脂を注入し、前記第二キャビティ内で前記第二樹脂を硬化させて、低屈折率部を形成する工程と、
前記入射側レンズ部および出射側レンズ部の一方と前記低屈折率部を保持したまま前記第一金型から前記第三金型を離間させ、前記第一金型と第四金型とを互いに当接させて第三キャビティを形成する工程と、
前記第三キャビティ内に溶融した第三樹脂を注入し、前記第三キャビティ内で前記第三樹脂を硬化させて、前記入射側レンズ部および前記出射側レンズ部の他方を形成する工程と、を備え、
硬化した前記第二樹脂は、硬化した前記第一樹脂および硬化した前記第三樹脂よりも屈折率が低い、マイクロズアレイの製造方法。 - 前記第一樹脂と前記第三樹脂は同じ樹脂である、請求項13に記載のマイクロズアレイの製造方法。
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US18/285,311 US20240184021A1 (en) | 2021-03-31 | 2022-03-16 | Microlens array, vehicle lamp using microlens array, and method for manufacturing microlens array |
CN202280026617.3A CN117120878A (zh) | 2021-03-31 | 2022-03-16 | 微透镜阵列、使用微透镜阵列的车辆用灯具及微透镜阵列的制造方法 |
EP22780147.9A EP4318051A1 (en) | 2021-03-31 | 2022-03-16 | Microlens array, vehicle lamp using microlens array, and method for manufacturing microlens array |
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- 2022-03-16 US US18/285,311 patent/US20240184021A1/en active Pending
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JPS5590924A (en) * | 1978-12-28 | 1980-07-10 | Canon Inc | Production of compound eye lens device |
JPH0427976A (ja) * | 1990-05-23 | 1992-01-30 | Nippon Sheet Glass Co Ltd | 光プリンタ |
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