WO2019004239A1 - Backlight unit and heads-up display - Google Patents

Backlight unit and heads-up display Download PDF

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Publication number
WO2019004239A1
WO2019004239A1 PCT/JP2018/024269 JP2018024269W WO2019004239A1 WO 2019004239 A1 WO2019004239 A1 WO 2019004239A1 JP 2018024269 W JP2018024269 W JP 2018024269W WO 2019004239 A1 WO2019004239 A1 WO 2019004239A1
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WO
WIPO (PCT)
Prior art keywords
heat sink
light
lens
display
substrate
Prior art date
Application number
PCT/JP2018/024269
Other languages
French (fr)
Japanese (ja)
Inventor
文吉 金子
正雄 佐藤
泰行 飯田
俊郎 鶴丸
長谷川　達也
航 齋藤
Original Assignee
日本精機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本精機株式会社 filed Critical 日本精機株式会社
Priority to JP2019526956A priority Critical patent/JP7100811B2/en
Publication of WO2019004239A1 publication Critical patent/WO2019004239A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/75—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with fins or blades having different shapes, thicknesses or spacing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells

Definitions

  • the present invention relates to a backlight unit and a head-up display provided with the backlight unit.
  • the head-up display is mounted, for example, on a vehicle, and displays a virtual image as information necessary for the driver to drive through a transmissive reflection unit such as a windshield.
  • a transmissive reflection unit such as a windshield.
  • the head-up display can display information superimposed on the scenery in front of the vehicle, and the driver can grasp necessary information without performing a large eye movement during driving.
  • the head-up display has a display device for displaying a display image.
  • the display device has a liquid crystal display panel and a backlight unit for illuminating the liquid crystal panel.
  • the backlight unit has a substrate on which the light source is mounted, and a lens for collecting light from the light source. Moreover, the backlight unit radiates the heat which a light source emits to the exterior by having a heat sink and a heat conduction sheet.
  • the lens is designed to efficiently collect the light of the light source. For this reason, the lens and the substrate must be positioned with high accuracy.
  • the backlight unit is manufactured by sequentially assembling a lens, a substrate, a heat conductive sheet and a heat sink.
  • a lens for example, in order to accurately position each component using a positioning pin and a corresponding hole, it is necessary to reduce the clearance between the positioning pin and the hole.
  • the larger the clearance the better. For this reason, coexistence with positioning accuracy and workability was a subject.
  • the present invention has been made in consideration of such circumstances, and it is an object of the present invention to provide a backlight unit excellent in manufacturability and a head-up display including the same.
  • the backlight unit dissipates the heat transmitted from the substrate on which the light source is mounted, the thermally conductive sheet which transmits the heat of the light source, and the thermally conductive sheet, And a heat sink having a mounting surface on which the heat conductive sheet is mounted, and a positioning wall for positioning the substrate and the heat conductive sheet with respect to the surface direction of the mounting surface.
  • the head-up display which concerns on this invention, and is a perspective view explaining the whole structure.
  • the longitudinal cross-sectional view of the head up display of FIG. The disassembled perspective view of a backlight unit. Sectional drawing of a backlight unit. Sectional drawing for demonstrating the positioning of a backlight unit.
  • the principal part top view which shows a display apparatus, a heat sink, and the wall part of upper case.
  • the head-up display according to the present invention is mounted, for example, on a vehicle such as a car.
  • the head-up display according to the present invention will be described using an example mounted on a car.
  • FIG. 1 is an embodiment of a head-up display according to the present invention, and is a perspective view for explaining the entire configuration.
  • FIG. 2 is a plan view of the head-up display 1 with the upper case 21 and the light transmitting cover 30 removed.
  • FIG. 3 is a longitudinal sectional view of the head-up display 1 of FIG.
  • a head-up display 1 (hereinafter referred to as HUD 1) is disposed in an instrument panel of a car.
  • the HUD 1 mainly includes a display device 3, a plane mirror 4, a concave mirror 5, a case 6, and a control substrate 7.
  • the HUD 1 reflects the display light representing the display image displayed by the display device 3 by the plane mirror 4 and the concave mirror 5 constituting the relay optical system, and irradiates the windshield of the car, which is an example of the transmission / reflection unit.
  • a viewer (mainly the driver) can view the virtual image of the display image superimposed on the real view in front of the vehicle.
  • the display device 3 outputs display light.
  • the display device 3 is, for example, a TFT (Thin Film Transistor) type liquid crystal display device.
  • the display device 3 has a backlight unit 40 and a liquid crystal display panel 41.
  • FIG. 4 is an exploded perspective view of the backlight unit 40. As shown in FIG.
  • FIG. 5 is a cross-sectional view of the backlight unit 40. As shown in FIG.
  • the backlight unit 40 includes a light source substrate 50, a lens 51, a lens case 52, a heat sink 53, and a heat conduction sheet 54.
  • a light source 56 is mounted on the light source substrate 50.
  • the light source 56 is made of a light emitting element such as a light emitting diode (LED) and emits a light beam.
  • the light source substrate 50 is, for example, an alumina (ceramics) substrate excellent in thermal conductivity.
  • the lens 51 condenses the light beam emitted from the light source 56 and collimates it with respect to the optical axis of the HUD 1.
  • the lens 51 makes one lens portion 51 a correspond to one light source 56.
  • the lens 51 has a plurality of lens portions 51 a.
  • the lens case 52 is a cylindrical case formed of an impermeable resin material.
  • the lens case 52 is attached to the heat sink 53, and accommodates the light source substrate 50 and the lens 51. Further, the lens case 52 guides parallel light emitted from the lens 51 to the liquid crystal display panel 41.
  • the lens case 52 has an open end 52 a facing the mounting surface 53 c when installed on the heat sink 53.
  • the heat sink 53 is provided at the opening 28 of the case 6 (lower case 22).
  • the heat sink 53 is formed of, for example, a metal such as aluminum.
  • the heat sink 53 releases the heat generated by the light source 56 in the fins 53a to the air.
  • the heat sink 53 has a light shielding wall 53d on the installation surface 53c.
  • the light shielding wall 53 d is provided to cover the periphery of the lens case 52.
  • the light shielding wall 53d has a height equal to or greater than the distance between the installation surface 53c and the opening end 52a.
  • the light shielding wall 53 d prevents the light beam of the light source 56 from leaking from the opening end 52 a of the lens case 52.
  • the light shielding wall 53d does not have to be provided all around the lens case 52, and in particular, may be provided in a portion where the opening is large or a portion which can be provided in relation to other members.
  • the heat transfer sheet 54 is provided between the light source substrate 50 and the heat sink 53, and efficiently transfers the heat of the light source 56 to the heat sink 53.
  • the liquid crystal display panel 41 (FIG. 2) has a liquid crystal cell and a polarizing plate.
  • the liquid crystal cell has a pair of light transmitting substrates on which a transparent electrode film is formed, and a liquid crystal layer sealed in the light transmitting substrate.
  • the polarizing plates are attached to the front and back of the liquid crystal cell. The light beam that has become parallel light from the lens 51 is transmitted through the liquid crystal display panel 41 and output as display light.
  • the plane mirror 4 (reflecting mirror) has, for example, a base made of a synthetic resin material, and a reflective film formed on the surface of the base by vapor deposition or the like.
  • the flat mirror 4 reflects the display light output from the display device 3 toward the concave mirror 5.
  • the concave mirror 5 (reflecting mirror) has, for example, a base made of a synthetic resin material and a reflective film formed on the surface of the base by means such as vapor deposition.
  • the concave mirror 5 reflects the display light reflected by the plane mirror 4 toward the windshield.
  • the concave mirror 5 has a function as a magnifier, magnifies the display image and reflects it to the windshield. Thereby, the viewer visually recognizes the virtual image in which the display image is enlarged. Further, the concave mirror 5 corrects the distortion of display light due to the curved surface of the windshield with a concave curved surface.
  • the concave mirror 5 is rotated about the rotation axis by an actuator, although detailed illustration is omitted here, for example.
  • the actuator adjusts the angle of the concave mirror 5 by rotating the concave mirror 5 to adjust the irradiation position of the display light, or adjusts the angle at which external light is not reflected by the concave mirror 5 toward the display device 3.
  • the case 6 (FIG. 1) is formed of, for example, a synthetic resin having a light shielding property of black, and has an upper case 21 and a lower case 22.
  • the case 6 has an internal space 23 that accommodates the display device 3, the plane mirror 4, and the concave mirror 5 by combining the upper case 21 and the lower case 22.
  • the upper case 21 has an opening 27.
  • the opening 27 is provided in a portion facing the windshield.
  • the opening 27 is covered by a translucent cover 30 as a translucent emitting part. That is, this means that the upper case 21 has the light transmitting cover 30 for emitting the display light to the front glass.
  • the lower case 22 is formed in a box shape having a bottom, and has a structure for mainly attaching the display device 3, the plane mirror 4, the concave mirror 5, and the control substrate 7.
  • the control board 7 is a printed circuit board on which a control unit (not shown) for controlling the operation of the display device 3 or the like is mounted.
  • the control unit includes, for example, a microcomputer having a storage device and an arithmetic device.
  • the control unit causes the display device 3 to display a display image by the computing device appropriately computing according to the operation program stored in advance by the storage device based on various types of vehicle information acquired from the in-vehicle network and various sensors.
  • the control substrate 7 is fixed to the lower case 22 along with the substrate cover 31 on the outer surface 29 outside the internal space 23 of the lower case 22.
  • FIG. 6 is a cross-sectional view for explaining the positioning of the backlight unit 40. As shown in FIG.
  • FIG. 7 is a rear perspective view for explaining the lens 51. As shown in FIG.
  • FIG. 8 is a perspective view when the heat conduction sheet 54 is installed on the heat sink 53.
  • the lens case 52 covers the lens 51, the light source substrate 50, and the heat conduction sheet 54 after the lens 51, the light source substrate 50, and the heat conduction sheet 54 are positioned and fixed to the heat sink 53. By being fixed by a screw, it is assembled as one unit.
  • the lens 51, the light source substrate 50, the thermally conductive sheet 54, and the heat sink 53 have a structure for positioning.
  • the light source substrate 50 has a first positioning hole 60 (hereinafter simply referred to as “a hole 60 in the substrate”).
  • the hole 60 in the substrate penetrates the light source substrate 50.
  • the heat sink 53 has a second positioning hole 61 (hereinafter simply referred to as "the hole 61 of the heat sink”).
  • the hole 61 of the heat sink has a thick hole 61a and a narrow hole 61b in order from the opening side.
  • the heat sink 53 has a positioning wall 53b for positioning the heat conduction sheet 54 and the light source substrate 50 in the surface direction of the installation surface 53c on the installation surface 53c on which the heat conduction sheet 54 and the light source substrate 50 are provided.
  • the heat conductive sheet 54 has a third positioning hole 62 (hereinafter simply referred to as "sheet hole 62").
  • sheet hole 62 The holes 62 in the sheet penetrate the heat conductive sheet 54.
  • the holes 62 of the sheet have a diameter larger than the holes 60 of the substrate and the holes 61 of the heat sink in consideration of the workability at the time of assembly.
  • the sheet hole 62 The heat sink hole 61 (thick hole 61a) is not concealed.
  • the holes 60 in the substrate, the holes 61 in the heat sink, and the holes 62 in the sheet are circular (elliptical).
  • the lens 51 has a hole 60 of the substrate, a hole 61 of the heat sink, and a positioning pin 65 having a circular cross-sectional shape, which is disposed substantially coaxially with the center of the hole 62 of the sheet.
  • the positioning pin 65 has a thick pin portion 65a, a thin pin portion 65b, and a tapered portion 65c.
  • the thick pin portion 65 a is provided on the root side of the positioning pin 65.
  • the thin pin portion 65 b is thinner than the thick pin portion 65 a and is provided on the tip end side of the positioning pin 65.
  • the tapered portion 65c connects the thick pin portion 65a and the thin pin portion 65b.
  • the positioning pin 65 has the thin pin portion 65 b, the tapered portion 65 c and the thick pin portion 65 a in order from the tip end side of the positioning pin 65.
  • the thin pin portion 65 b fits the thin hole portion 61 b of the hole 61 of the heat sink, thereby positioning the heat sink 53 and the lens 51.
  • the thick pin portion 65 a positions the lens 51 and the light source substrate 50 by fitting the hole 60 of the substrate.
  • the thick hole portion 61a is larger (thicker) than the hole 60 (thick pin portion 65a) of the substrate.
  • the backlight unit 40 having the configuration for such positioning is positioned as follows.
  • the heat conduction sheet 54 and the light source substrate 50 are sequentially disposed on the heat sink 53.
  • the heat sink 53 has a heat conducting sheet 54 and a positioning wall 53 b for positioning the light source substrate 50. For this reason, the heat conduction sheet 54 and the light source substrate 50 are positioned on the installation surface 53c according to the positioning wall 53b, so that they are accurately positioned.
  • the positioning pin 65 of the lens 51 is inserted into the hole 61 of the heat sink through the hole 60 of the substrate and the hole 62 of the sheet.
  • the heat conduction sheet 54 is accurately positioned by the positioning wall 53b. Therefore, the heat conduction sheet 54 does not inhibit the insertion of the positioning pin 65.
  • an assembly error may occur, and the heat conductive sheet 54 may move in a slight gap between the positioning wall 53 b and the center of the hole 62 of the sheet and the hole 61 of the heat sink.
  • the holes 62 of the sheet are larger than the holes 61 of the heat sink so that the holes 62 of the sheet do not hide the holes 61 of the heat sink (the thick holes 61a and the narrow holes 61b). Therefore, the heat conduction sheet 54 does not inhibit the insertion of the positioning pin 65.
  • the positioning pin 65 is inserted into the hole 61 of the heat sink, the narrow pin portion 65b is inserted into and fitted to the narrow hole portion 61b, and the lens 51 and the heat sink 53 are correctly positioned.
  • the tapered portion 65c located in the hole 60 of the substrate slides the light source substrate 50 to guide it to the correct position.
  • the thick pin portion 65a is inserted into and fitted in the hole 60 of the substrate, and the lens 51 and the light source substrate 50 are correctly positioned. That is, by inserting the positioning pin 65 into the hole 61 of the heat sink, the positions of the light source substrate 50 and the lens 51 are determined, and at the same time, the positions of the lens 51 and the heat sink 53 are determined. For this reason, even if assembly errors occur and the centers of the holes 60 of the substrate and the holes 61 of the heat sink shift, the assembly operation is easy.
  • the backlight unit 40 and the HUD 1 in this embodiment can improve the manufacturability by improving the workability at the time of assembly. That is, the heat sink 53 has a positioning wall 53b. Thereby, the worker can arrange the heat conduction sheet 54 and the light source substrate 50 on the heat sink 53 easily and accurately. Further, since the holes 62 of the sheet, the holes 60 of the substrate, and the holes 61 of the heat sink are accurately arranged, the operator can easily insert the positioning pin 65.
  • the heat sink 53 has a light shielding wall 53d.
  • the light blocking wall 53 d can block light leaking from the opening end 52 a of the lens case 52. For this reason, HUD 1 in this embodiment can display a display image correctly, without making light other than the light of a display image approach into the optical path of a display image.
  • FIG. 9 is a plan view of relevant parts showing the display device 3, the heat sink 53 and a wall portion of the upper case 21 described later in FIG. 2 in a simplified manner.
  • FIG. 10 is a side view of an essential part of the upper case 21. As shown in FIG.
  • the lower case 22 has a peripheral wall 22a as one side wall provided so as to overlap the heat sink 53.
  • the peripheral wall 22a has a base 22b in the form of an upright wall of a thin plate, which is the main part, and a gap S1 between the base 22b and the heat sink 53 with a minute clearance (two locations). It has the above-mentioned opening (opening) 28 which enables the fin 53a which is a required part of 53 to be exposed to the outside of the lower case 22.
  • the opening 28 here is a cutaway portion in which the base portion 22 b corresponding to the heat sink 53 is cut out.
  • Reference numeral 53 e denotes a pair of wedge-shaped fixing portions provided around the heat sink 53.
  • the fixing portion 53e has, for example, a screw fixing structure for screwing the lower case 22 and the heat sink 53, a positioning structure for positioning the lower case 22 and the heat sink 53, etc. Provided.
  • the liquid crystal display panel 41 is not in close contact with the lens case 52, and the liquid crystal display panel 41 and the lens case 52 And a space S2 is formed between them.
  • the outgoing light (light beam) emitted from the lens unit 51a (lens 51) travels to the liquid crystal display panel 41, passes through the space S2, and is outside the lens case 52. And leaked light.
  • Reference numeral 52 b denotes an opening window partially provided in the vicinity of the opening end 52 a of the lens case 52, and the opening window 52 b is formed to correspond to the connector 50 a mounted on the light source substrate 50. Then, although not shown in detail here, one connector of the pair of connectors mounted on both ends of the wiring cord is connected to the connector 50a through the opening window 52b, and the other connector is connected to the control board 7 By connecting the connector, the light source 56 can be supplied with lighting power.
  • 21a is a rib-shaped (two) wall portion formed on the upper case 21 provided to be paired with the lower case 22.
  • the wall portion 21a provided so as to hang from the upper case 21 is located inside the base portion 22b (the gap portion S1) so as to close the above-mentioned (two) gap portions S1, and a space is formed through a predetermined light path. It has a function as a light shielding wall (light shielding rib) for shielding the leakage light and the like from the portion S2 to the gap portion S1.
  • the predetermined optical path for example, an optical path of light reflected toward the lower case 22 through the inner wall surface of the upper case 21 facing the space portion S2 and the inner space 23 side sequentially to the lower case 22 is listed. be able to.
  • a part of the light beam from the light source 56 leaks from the opening window 52b of the lens case 52, for example, and is reflected to the lower case 22 by the inner wall surface of the upper case 21
  • the wall 21a is formed on the upper case 21 so as to close the gap S1, the leaked light and the lens case The light leaked from the opening window 52b of 52 and directed to the gap S1 can be surely blocked by the wall 21a. Therefore, when the light source 56 is lit, it is possible to reliably prevent the light beam emitted from the light source 56 from leaking to the outside of the HUD 1 and to improve the commercial property.
  • HUD Head-up display
  • Reference Signs List 3 display device 4 plane mirror 5 concave mirror 6 case 7 control board 21 upper case 21 a wall portion (light shielding wall) 22 lower case 22a peripheral wall 22b base 28 opening (opening) 30 Translucent cover (emitting part) DESCRIPTION OF SYMBOLS 40 Backlight unit 41 Liquid crystal display panel 50 Light source substrate 51 Lens 52 Lens case 52a Opening end 53 Heat sink 53b Positioning wall 53c Installation surface 53d Light shielding wall 54 Heat conduction sheet 56 Light source 60 1st positioning hole (hole of substrate) 61 2nd positioning hole (hole of heat sink) 62 3rd positioning hole (hole in sheet) 65 Positioning pin S1 Gap S2 Space

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Combustion & Propulsion (AREA)
  • Geometry (AREA)
  • Instrument Panels (AREA)
  • Liquid Crystal (AREA)
  • Securing Globes, Refractors, Reflectors Or The Like (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
  • Planar Illumination Modules (AREA)

Abstract

This backlight unit has: a substrate on which a light source is mounted; a thermally conductive sheet (54) that conducts the heat from the light source; and a heat sink (53). The heat sink (53) radiates the heat transmitted by the thermally conductive sheet (54), and has an installation surface (53c) on which the substrate and the thermally conductive sheet (54) are placed, and positioning walls (53b) for positioning the substrate and the thermally conductive sheet (54) in relation to the surface direction of the installation surface (53c). In addition, the heat sink (53) has light-shielding walls (53d) each having a height which is equal to or greater than the distance between the installation surface (53c) and an opening end of a lens case.

Description

バックライトユニット及びヘッドアップディスプレイBacklight unit and head up display
　本発明は、バックライトユニットおよびそのバックライトユニットを備えたヘッドアップディスプレイに関する。 The present invention relates to a backlight unit and a head-up display provided with the backlight unit.
　ヘッドアップディスプレイは、例えば車両に搭載され、運転者に運転に必要な情報などをフロントガラスなどの透過反射部を介して虚像表示する。これにより、ヘッドアップディスプレイは、車両前方の景色と重ね合わせて情報を表示することができ、運転者は、運転中に大きな視線移動を行うことなく、必要な情報を把握することができる。 The head-up display is mounted, for example, on a vehicle, and displays a virtual image as information necessary for the driver to drive through a transmissive reflection unit such as a windshield. As a result, the head-up display can display information superimposed on the scenery in front of the vehicle, and the driver can grasp necessary information without performing a large eye movement during driving.
　ヘッドアップディスプレイは、表示画像を表示するための表示装置を有している。この表示装置は、液晶表示パネルと、この液晶パネルを照明するためのバックライトユニットとを有している。バックライトユニットは、光源が実装された基板、および光源からの光を集光させるレンズを有している。また、バックライトユニットは、ヒートシンクおよび熱伝導シートを有することにより、光源が発する熱を外部に放熱している。 The head-up display has a display device for displaying a display image. The display device has a liquid crystal display panel and a backlight unit for illuminating the liquid crystal panel. The backlight unit has a substrate on which the light source is mounted, and a lens for collecting light from the light source. Moreover, the backlight unit radiates the heat which a light source emits to the exterior by having a heat sink and a heat conduction sheet.
特開２０１０－６１９６号公報JP, 2010-6196, A
　レンズは、光源の光を効率よく集光するように設計されている。このため、レンズと基板とは、精度よく位置決めされなければならない。 The lens is designed to efficiently collect the light of the light source. For this reason, the lens and the substrate must be positioned with high accuracy.
　ここで、バックライトユニットは、レンズ、基板、熱伝導シートおよびヒートシンクが順次組み立てられることにより製造される。例えば、各部品を位置決めピンと対応した穴とを用いて精度よく位置決めしようとすると、位置決めピンと穴との間のクリアランスを小さくする必要がある。一方、組立時の作業性を向上させようとすると、クリアランスは大きい方がよい。このため、位置決め精度と作業性との両立は課題であった。 Here, the backlight unit is manufactured by sequentially assembling a lens, a substrate, a heat conductive sheet and a heat sink. For example, in order to accurately position each component using a positioning pin and a corresponding hole, it is necessary to reduce the clearance between the positioning pin and the hole. On the other hand, in order to improve the workability at the time of assembly, the larger the clearance, the better. For this reason, coexistence with positioning accuracy and workability was a subject.
　本発明はこのような事情を考慮してなされたもので、製造性に優れたバックライトユニットおよびそれを備えたヘッドアップディスプレイを提供することを目的とする。 The present invention has been made in consideration of such circumstances, and it is an object of the present invention to provide a backlight unit excellent in manufacturability and a head-up display including the same.
　本発明に係るバックライトユニットは、上述した課題を解決するために、光源が実装された基板と、前記光源の熱を伝える熱伝導シートと、前記熱伝導シートから伝わる熱を放熱し、前記基板及び前記熱伝導シートを設置する設置面と、前記基板及び前記熱伝導シートを前記設置面の面方向に関して位置決めする位置決め壁とを有するヒートシンクと、を備える。 In order to solve the problems described above, the backlight unit according to the present invention dissipates the heat transmitted from the substrate on which the light source is mounted, the thermally conductive sheet which transmits the heat of the light source, and the thermally conductive sheet, And a heat sink having a mounting surface on which the heat conductive sheet is mounted, and a positioning wall for positioning the substrate and the heat conductive sheet with respect to the surface direction of the mounting surface.
　本発明に係るバックライトユニットおよびヘッドアップディスプレイにおいては、製造性を向上させることができる。 In the backlight unit and the head-up display according to the present invention, manufacturability can be improved.
本発明に係るヘッドアップディスプレイの実施形態であり、全体構成を説明する斜視図。BRIEF DESCRIPTION OF THE DRAWINGS It is an embodiment of the head-up display which concerns on this invention, and is a perspective view explaining the whole structure. 上ケースおよび透光カバーを外した状態のヘッドアップディスプレイの平面図。The top view of the head up display of the state which removed the upper case and the light transmission cover. 図１のヘッドアップディスプレイの縦断面図。The longitudinal cross-sectional view of the head up display of FIG. バックライトユニットの分解斜視図。The disassembled perspective view of a backlight unit. バックライトユニットの断面図。Sectional drawing of a backlight unit. バックライトユニットの位置決めを説明するための断面図。Sectional drawing for demonstrating the positioning of a backlight unit. レンズを説明するための背面から見た斜視図。The perspective view seen from the back for explaining a lens. ヒートシンクに熱伝導シートが設置された場合の斜視図。The perspective view at the time of installing a heat conduction sheet to a heat sink. 表示装置とヒートシンクと上ケースの壁部とを示す要部平面図。The principal part top view which shows a display apparatus, a heat sink, and the wall part of upper case. 上ケースの要部側面図。The principal part side view of an upper case.
　本発明に係るヘッドアップディスプレイの実施形態を添付図面に基づいて説明する。本発明に係るヘッドアップディスプレイは、例えば自動車などの車両に搭載される。本実施形態においては、本発明に係るヘッドアップディスプレイが自動車に搭載される例を用いて説明する。 An embodiment of a head-up display according to the present invention will be described based on the attached drawings. The head-up display according to the present invention is mounted, for example, on a vehicle such as a car. In the present embodiment, the head-up display according to the present invention will be described using an example mounted on a car.
　図１は、本発明に係るヘッドアップディスプレイの実施形態であり、全体構成を説明する斜視図である。 FIG. 1 is an embodiment of a head-up display according to the present invention, and is a perspective view for explaining the entire configuration.
　図２は、上ケース２１及び透光カバー３０を外した状態のヘッドアップディスプレイ１の平面図である。 FIG. 2 is a plan view of the head-up display 1 with the upper case 21 and the light transmitting cover 30 removed.
　図３は、図１のヘッドアップディスプレイ１の縦断面図である。 FIG. 3 is a longitudinal sectional view of the head-up display 1 of FIG.
　ヘッドアップディスプレイ１（以下、ＨＵＤ１という。）は、自動車のインストルメントパネル内に配置される。ＨＵＤ１は、表示装置３と、平面鏡４と、凹面鏡５と、ケース６と、制御基板７と、を主に有している。ＨＵＤ１は、表示装置３が表示した表示画像を表す表示光を、リレー光学系を構成する平面鏡４と凹面鏡５とで反射させ、透過反射部の一例である自動車のフロントガラスに照射する。視認者（主に運転者）は、車両前方の実景と重ねて表示画像の虚像を視認することができる。 A head-up display 1 (hereinafter referred to as HUD 1) is disposed in an instrument panel of a car. The HUD 1 mainly includes a display device 3, a plane mirror 4, a concave mirror 5, a case 6, and a control substrate 7. The HUD 1 reflects the display light representing the display image displayed by the display device 3 by the plane mirror 4 and the concave mirror 5 constituting the relay optical system, and irradiates the windshield of the car, which is an example of the transmission / reflection unit. A viewer (mainly the driver) can view the virtual image of the display image superimposed on the real view in front of the vehicle.
　表示装置３は、表示光を出力する。表示装置３は、例えばＴＦＴ（Thin Film Transistor）型の液晶表示装置である。表示装置３は、バックライトユニット４０と、液晶表示パネル４１とを有している。 The display device 3 outputs display light. The display device 3 is, for example, a TFT (Thin Film Transistor) type liquid crystal display device. The display device 3 has a backlight unit 40 and a liquid crystal display panel 41.
　図４は、バックライトユニット４０の分解斜視図である。 FIG. 4 is an exploded perspective view of the backlight unit 40. As shown in FIG.
　図５は、バックライトユニット４０の断面図である。 FIG. 5 is a cross-sectional view of the backlight unit 40. As shown in FIG.
　バックライトユニット４０は、光源基板５０と、レンズ５１と、レンズケース５２と、ヒートシンク５３と、熱伝導シート５４と、を有している。光源基板５０は、光源５６が実装されている。光源５６は、ＬＥＤ（Light Emitting Diode）などの発光素子からなり、光線を発する。光源基板５０は、例えば熱伝導率に優れたアルミナ（セラミックス）基板である。レンズ５１は、光源５６から出射される光線を集光し、ＨＵＤ１の光軸に対して平行化する。レンズ５１は、１個の光源５６に対して１つのレンズ部５１ａを対応させている。すなわち、光源５６が複数使用される場合、レンズ５１はレンズ部５１ａを複数有している。レンズケース５２は、非透過性樹脂材料から形成される筒状のケースである。レンズケース５２は、ヒートシンク５３に取り付けられており、光源基板５０とレンズ５１とを収容する。また、レンズケース５２は、レンズ５１から出射される平行光を液晶表示パネル４１へ導く。レンズケース５２は、ヒートシンク５３に設置された際に、設置面５３ｃに面する開口端５２ａを有している。 The backlight unit 40 includes a light source substrate 50, a lens 51, a lens case 52, a heat sink 53, and a heat conduction sheet 54. A light source 56 is mounted on the light source substrate 50. The light source 56 is made of a light emitting element such as a light emitting diode (LED) and emits a light beam. The light source substrate 50 is, for example, an alumina (ceramics) substrate excellent in thermal conductivity. The lens 51 condenses the light beam emitted from the light source 56 and collimates it with respect to the optical axis of the HUD 1. The lens 51 makes one lens portion 51 a correspond to one light source 56. That is, when a plurality of light sources 56 are used, the lens 51 has a plurality of lens portions 51 a. The lens case 52 is a cylindrical case formed of an impermeable resin material. The lens case 52 is attached to the heat sink 53, and accommodates the light source substrate 50 and the lens 51. Further, the lens case 52 guides parallel light emitted from the lens 51 to the liquid crystal display panel 41. The lens case 52 has an open end 52 a facing the mounting surface 53 c when installed on the heat sink 53.
　ヒートシンク５３は、ケース６（下ケース２２）の開口部２８に設けられている。ヒートシンク５３は、例えばアルミニウムなどの金属で形成されている。ヒートシンク５３は、フィン５３ａにおいて光源５６が発する熱を空中に放出する。ヒートシンク５３は、設置面５３ｃに遮光壁５３ｄを有している。遮光壁５３ｄは、レンズケース５２の周囲を覆うように設けられる。遮光壁５３ｄは、設置面５３ｃと開口端５２ａとの距離以上の高さを有する。遮光壁５３ｄは、光源５６の光線がレンズケース５２の開口端５２ａから漏れることを防止する。遮光壁５３ｄは、レンズケース５２の周囲全てに設ける必要はなく、特に開口が大きい箇所や他の部材との関係で設けることができる箇所に設ければよい。熱伝導シート５４は、光源基板５０とヒートシンク５３との間に設けられ、光源５６の熱を効率よくヒートシンク５３に伝える。 The heat sink 53 is provided at the opening 28 of the case 6 (lower case 22). The heat sink 53 is formed of, for example, a metal such as aluminum. The heat sink 53 releases the heat generated by the light source 56 in the fins 53a to the air. The heat sink 53 has a light shielding wall 53d on the installation surface 53c. The light shielding wall 53 d is provided to cover the periphery of the lens case 52. The light shielding wall 53d has a height equal to or greater than the distance between the installation surface 53c and the opening end 52a. The light shielding wall 53 d prevents the light beam of the light source 56 from leaking from the opening end 52 a of the lens case 52. The light shielding wall 53d does not have to be provided all around the lens case 52, and in particular, may be provided in a portion where the opening is large or a portion which can be provided in relation to other members. The heat transfer sheet 54 is provided between the light source substrate 50 and the heat sink 53, and efficiently transfers the heat of the light source 56 to the heat sink 53.
　液晶表示パネル４１（図２）は、液晶セルと偏光板とを有している。液晶セルは、透明電極膜が形成された一対の透光性基板と、この透光性基板に封入された液晶層とを有している。偏光板は、液晶セルの前後両面に貼り付けられている。レンズ５１からの平行光となった光線は、液晶表示パネル４１を透過して表示光となり出力される。 The liquid crystal display panel 41 (FIG. 2) has a liquid crystal cell and a polarizing plate. The liquid crystal cell has a pair of light transmitting substrates on which a transparent electrode film is formed, and a liquid crystal layer sealed in the light transmitting substrate. The polarizing plates are attached to the front and back of the liquid crystal cell. The light beam that has become parallel light from the lens 51 is transmitted through the liquid crystal display panel 41 and output as display light.
　平面鏡４（反射鏡）は、例えば合成樹脂材料からなる基材と、蒸着などにより基材の表面に形成された反射膜とを有している。平面鏡４は、表示装置３から出力された表示光を凹面鏡５に向けて反射させる。 The plane mirror 4 (reflecting mirror) has, for example, a base made of a synthetic resin material, and a reflective film formed on the surface of the base by vapor deposition or the like. The flat mirror 4 reflects the display light output from the display device 3 toward the concave mirror 5.
　凹面鏡５（反射鏡）は、例えば合成樹脂材料からなる基材と、蒸着などの手段により基材の表面に形成された反射膜とを有している。凹面鏡５は、平面鏡４で反射した表示光をフロントガラスに向けて反射させる。凹面鏡５は、拡大鏡としての機能を有し、表示画像を拡大してフロントガラスへ反射する。これにより、視認者は、表示画像が拡大された虚像を視認する。また、凹面鏡５は、フロントガラスの曲面による表示光の歪みを凹面状の曲面にて補正する。凹面鏡５は、例えばここでの詳細図示は省略するが、アクチュエータにより回転軸周りに回転する。アクチュエータは、凹面鏡５を回転させることで凹面鏡５の角度を調整し、表示光の照射位置を調整したり、外光が凹面鏡５によって表示装置３に向かうように反射されない角度に調整したりする。 The concave mirror 5 (reflecting mirror) has, for example, a base made of a synthetic resin material and a reflective film formed on the surface of the base by means such as vapor deposition. The concave mirror 5 reflects the display light reflected by the plane mirror 4 toward the windshield. The concave mirror 5 has a function as a magnifier, magnifies the display image and reflects it to the windshield. Thereby, the viewer visually recognizes the virtual image in which the display image is enlarged. Further, the concave mirror 5 corrects the distortion of display light due to the curved surface of the windshield with a concave curved surface. The concave mirror 5 is rotated about the rotation axis by an actuator, although detailed illustration is omitted here, for example. The actuator adjusts the angle of the concave mirror 5 by rotating the concave mirror 5 to adjust the irradiation position of the display light, or adjusts the angle at which external light is not reflected by the concave mirror 5 toward the display device 3.
　ケース６（図１）は、例えば黒色の遮光性を有する合成樹脂から形成され、上ケース２１と、下ケース２２とを有している。ケース６は、上ケース２１と下ケース２２とを組み合わせることで、表示装置３と、平面鏡４と、凹面鏡５とを収容する内部空間２３を有している。上ケース２１は、開口部２７を有している。開口部２７は、フロントガラスに対向する部分に設けられる。開口部２７は、透光性を有する出射部としての透光カバー３０に覆われている。つまり、このことは、上ケース２１は、表示光をフロントガラスへと出射する透光カバー３０を有していることを意味する。下ケース２２は、有底の箱型形状にて形成され、表示装置３、平面鏡４、凹面鏡５、および制御基板７を主に取り付けるための構造を有している。 The case 6 (FIG. 1) is formed of, for example, a synthetic resin having a light shielding property of black, and has an upper case 21 and a lower case 22. The case 6 has an internal space 23 that accommodates the display device 3, the plane mirror 4, and the concave mirror 5 by combining the upper case 21 and the lower case 22. The upper case 21 has an opening 27. The opening 27 is provided in a portion facing the windshield. The opening 27 is covered by a translucent cover 30 as a translucent emitting part. That is, this means that the upper case 21 has the light transmitting cover 30 for emitting the display light to the front glass. The lower case 22 is formed in a box shape having a bottom, and has a structure for mainly attaching the display device 3, the plane mirror 4, the concave mirror 5, and the control substrate 7.
　制御基板７は、表示装置３などの動作を制御する制御部（図示せず）が実装されたプリント回路板である。制御部は、例えば、記憶装置と、演算装置とを有するマイクロコンピュータを有している。制御部は、車内ネットワークや各種センサから取得した各種車両情報に基づいて、記憶装置が予め記憶した動作プログラムに従い演算装置が適宜演算することにより、表示装置３に表示画像を表示させる。制御基板７は、下ケース２２の内部空間２３外の外面２９に基板カバー３１とともに下ケース２２に固定されている。 The control board 7 is a printed circuit board on which a control unit (not shown) for controlling the operation of the display device 3 or the like is mounted. The control unit includes, for example, a microcomputer having a storage device and an arithmetic device. The control unit causes the display device 3 to display a display image by the computing device appropriately computing according to the operation program stored in advance by the storage device based on various types of vehicle information acquired from the in-vehicle network and various sensors. The control substrate 7 is fixed to the lower case 22 along with the substrate cover 31 on the outer surface 29 outside the internal space 23 of the lower case 22.
　以下、バックライトユニット４０の組み立てについて、詳細に説明する。 Hereinafter, the assembly of the backlight unit 40 will be described in detail.
　図６は、バックライトユニット４０の位置決めを説明するための断面図である。 FIG. 6 is a cross-sectional view for explaining the positioning of the backlight unit 40. As shown in FIG.
　図７は、レンズ５１を説明するための背面から見た斜視図である。 FIG. 7 is a rear perspective view for explaining the lens 51. As shown in FIG.
　図８は、ヒートシンク５３に熱伝導シート５４が設置された場合の斜視図である。 FIG. 8 is a perspective view when the heat conduction sheet 54 is installed on the heat sink 53.
　バックライトユニット４０は、レンズ５１、光源基板５０、及び熱伝導シート５４がヒートシンク５３に位置決めされ固定された後、レンズケース５２がレンズ５１、光源基板５０、及び熱伝導シート５４を覆いヒートシンク５３にネジにより固定されることにより、一つのユニットとして組み立てられている。 In the backlight unit 40, the lens case 52 covers the lens 51, the light source substrate 50, and the heat conduction sheet 54 after the lens 51, the light source substrate 50, and the heat conduction sheet 54 are positioned and fixed to the heat sink 53. By being fixed by a screw, it is assembled as one unit.
　レンズ５１、光源基板５０、熱伝導シート５４、及びヒートシンク５３は、位置決めのための構造を有している。具体的には、光源基板５０は、第１の位置決め穴６０（以下単に、「基板の穴６０」という）を有している。基板の穴６０は、光源基板５０を貫通している。ヒートシンク５３は、第２の位置決め穴６１（以下単に、「ヒートシンクの穴６１」という）を有している。ヒートシンクの穴６１は、開口側から順に太穴部６１ａと細穴部６１ｂとを有している。また、ヒートシンク５３は、熱伝導シート５４及び光源基板５０を設置する設置面５３ｃ上に、熱伝導シート５４及び光源基板５０を設置面５３ｃの面方向に関して位置決めするための位置決め壁５３ｂを有している。熱伝導シート５４は、第３の位置決め穴６２（以下単に、「シートの穴６２」という）を有している。シートの穴６２は、熱伝導シート５４を貫通している。シートの穴６２は、組立時の作業性を考慮し、基板の穴６０、ヒートシンクの穴６１よりも大きい径を有している。特に、組立誤差により熱伝導シート５４が位置決め壁５３ｂとの間の僅かな隙間を移動し、シートの穴６２とヒートシンクの穴６１との中心がずれた場合であっても、シートの穴６２がヒートシンクの穴６１（太穴部６１ａ）を隠してしまうことがないようになっている。本実施形態においては、基板の穴６０、ヒートシンクの穴６１、及びシートの穴６２は、円形（楕円形）である。 The lens 51, the light source substrate 50, the thermally conductive sheet 54, and the heat sink 53 have a structure for positioning. Specifically, the light source substrate 50 has a first positioning hole 60 (hereinafter simply referred to as “a hole 60 in the substrate”). The hole 60 in the substrate penetrates the light source substrate 50. The heat sink 53 has a second positioning hole 61 (hereinafter simply referred to as "the hole 61 of the heat sink"). The hole 61 of the heat sink has a thick hole 61a and a narrow hole 61b in order from the opening side. Further, the heat sink 53 has a positioning wall 53b for positioning the heat conduction sheet 54 and the light source substrate 50 in the surface direction of the installation surface 53c on the installation surface 53c on which the heat conduction sheet 54 and the light source substrate 50 are provided. There is. The heat conductive sheet 54 has a third positioning hole 62 (hereinafter simply referred to as "sheet hole 62"). The holes 62 in the sheet penetrate the heat conductive sheet 54. The holes 62 of the sheet have a diameter larger than the holes 60 of the substrate and the holes 61 of the heat sink in consideration of the workability at the time of assembly. In particular, even if the heat conduction sheet 54 moves a slight gap between the heat transfer sheet 54 and the positioning wall 53b due to an assembly error and the center between the sheet hole 62 and the heat sink hole 61 shifts, the sheet hole 62 The heat sink hole 61 (thick hole 61a) is not concealed. In the present embodiment, the holes 60 in the substrate, the holes 61 in the heat sink, and the holes 62 in the sheet are circular (elliptical).
　レンズ５１は、基板の穴６０、ヒートシンクの穴６１、及びシートの穴６２の中心と略同一軸上に配置された、断面形状が円形の位置決めピン６５を有している。位置決めピン６５は、太ピン部６５ａと、細ピン部６５ｂと、テーパ部６５ｃと、を有している。太ピン部６５ａは、位置決めピン６５の根元側に設けられている。細ピン部６５ｂは、太ピン部６５ａよりも細く、位置決めピン６５の先端側に設けられている。テーパ部６５ｃは、太ピン部６５ａと細ピン部６５ｂとを接続する。すなわち、位置決めピン６５は、細ピン部６５ｂ、テーパ部６５ｃ及び太ピン部６５ａを位置決めピン６５の先端側から順に有している。細ピン部６５ｂは、ヒートシンクの穴６１の細穴部６１ｂと嵌まり合うことにより、ヒートシンク５３とレンズ５１とを位置を決めする。太ピン部６５ａは、基板の穴６０と嵌まり合うことにより、レンズ５１と光源基板５０とを位置決めする。また、太穴部６１ａは、基板の穴６０（太ピン部６５ａ）よりも大きく（太く）なっている。 The lens 51 has a hole 60 of the substrate, a hole 61 of the heat sink, and a positioning pin 65 having a circular cross-sectional shape, which is disposed substantially coaxially with the center of the hole 62 of the sheet. The positioning pin 65 has a thick pin portion 65a, a thin pin portion 65b, and a tapered portion 65c. The thick pin portion 65 a is provided on the root side of the positioning pin 65. The thin pin portion 65 b is thinner than the thick pin portion 65 a and is provided on the tip end side of the positioning pin 65. The tapered portion 65c connects the thick pin portion 65a and the thin pin portion 65b. That is, the positioning pin 65 has the thin pin portion 65 b, the tapered portion 65 c and the thick pin portion 65 a in order from the tip end side of the positioning pin 65. The thin pin portion 65 b fits the thin hole portion 61 b of the hole 61 of the heat sink, thereby positioning the heat sink 53 and the lens 51. The thick pin portion 65 a positions the lens 51 and the light source substrate 50 by fitting the hole 60 of the substrate. The thick hole portion 61a is larger (thicker) than the hole 60 (thick pin portion 65a) of the substrate.
　このような位置決めのための構成を有するバックライトユニット４０は、以下の通り位置決めされる。 The backlight unit 40 having the configuration for such positioning is positioned as follows.
　まず、熱伝導シート５４及び光源基板５０が、ヒートシンク５３上に順次配置される。ヒートシンク５３は熱伝導シート５４及び光源基板５０を位置決めするための位置決め壁５３ｂを有している。このため、熱伝導シート５４及び光源基板５０は、この位置決め壁５３ｂに合わせて、設置面５３ｃに設置されることにより、精度よく位置決めされる。 First, the heat conduction sheet 54 and the light source substrate 50 are sequentially disposed on the heat sink 53. The heat sink 53 has a heat conducting sheet 54 and a positioning wall 53 b for positioning the light source substrate 50. For this reason, the heat conduction sheet 54 and the light source substrate 50 are positioned on the installation surface 53c according to the positioning wall 53b, so that they are accurately positioned.
　次に、レンズ５１の位置決めピン６５が、基板の穴６０と、シートの穴６２とを貫通して、ヒートシンクの穴６１に挿入される。 Next, the positioning pin 65 of the lens 51 is inserted into the hole 61 of the heat sink through the hole 60 of the substrate and the hole 62 of the sheet.
　ここで、上述の通り位置決め壁５３ｂにより熱伝導シート５４が精度よく位置決めされている。このため、熱伝導シート５４が位置決めピン６５の挿入を阻害することがない。また、組立誤差が生じ、熱伝導シート５４が位置決め壁５３ｂとの間の僅かな隙間を移動し、シートの穴６２とヒートシンクの穴６１との中心がずれる虞がある。しかし、シートの穴６２がヒートシンクの穴６１（太穴部６１ａ及び細穴部６１ｂ）を隠してしまうことがないよう、シートの穴６２はヒートシンクの穴６１よりも大きくなっている。このため、熱伝導シート５４が位置決めピン６５の挿入を阻害することがない。 Here, as described above, the heat conduction sheet 54 is accurately positioned by the positioning wall 53b. Therefore, the heat conduction sheet 54 does not inhibit the insertion of the positioning pin 65. In addition, an assembly error may occur, and the heat conductive sheet 54 may move in a slight gap between the positioning wall 53 b and the center of the hole 62 of the sheet and the hole 61 of the heat sink. However, the holes 62 of the sheet are larger than the holes 61 of the heat sink so that the holes 62 of the sheet do not hide the holes 61 of the heat sink (the thick holes 61a and the narrow holes 61b). Therefore, the heat conduction sheet 54 does not inhibit the insertion of the positioning pin 65.
　また、位置決めピン６５がヒートシンクの穴６１に挿入され、細ピン部６５ｂが細穴部６１ｂに挿入されて嵌まり合い、レンズ５１とヒートシンク５３とは正しく位置決めされる。同時に、基板の穴６０に位置するテーパ部６５ｃが光源基板５０をスライドさせて正しい位置に案内する。これにより、太ピン部６５ａが基板の穴６０に挿入されて嵌まり合い、レンズ５１と光源基板５０とは正しく位置決めされる。すなわち、位置決めピン６５がヒートシンクの穴６１に挿入されることにより、光源基板５０とレンズ５１との位置が決まると同時に、レンズ５１とヒートシンク５３との位置が決まる。このため、組立誤差が生じ、基板の穴６０とヒートシンクの穴６１との中心がずれてしまう場合であっても、組立作業は容易である。 Further, the positioning pin 65 is inserted into the hole 61 of the heat sink, the narrow pin portion 65b is inserted into and fitted to the narrow hole portion 61b, and the lens 51 and the heat sink 53 are correctly positioned. At the same time, the tapered portion 65c located in the hole 60 of the substrate slides the light source substrate 50 to guide it to the correct position. As a result, the thick pin portion 65a is inserted into and fitted in the hole 60 of the substrate, and the lens 51 and the light source substrate 50 are correctly positioned. That is, by inserting the positioning pin 65 into the hole 61 of the heat sink, the positions of the light source substrate 50 and the lens 51 are determined, and at the same time, the positions of the lens 51 and the heat sink 53 are determined. For this reason, even if assembly errors occur and the centers of the holes 60 of the substrate and the holes 61 of the heat sink shift, the assembly operation is easy.
　このような本実施形態におけるバックライトユニット４０及びＨＵＤ１は、組立時の作業性を向上させることにより、製造性を向上させることができる。すなわち、ヒートシンク５３は、位置決め壁５３ｂを有している。これにより、作業者は、熱伝導シート５４及び光源基板５０を簡易に、且つ精度よくヒートシンク５３上に配置することができる。また、シートの穴６２、基板の穴６０及びヒートシンクの穴６１が精度よく配置されるため、作業者は位置決めピン６５の挿入作業を容易に行うことができる。 The backlight unit 40 and the HUD 1 in this embodiment can improve the manufacturability by improving the workability at the time of assembly. That is, the heat sink 53 has a positioning wall 53b. Thereby, the worker can arrange the heat conduction sheet 54 and the light source substrate 50 on the heat sink 53 easily and accurately. Further, since the holes 62 of the sheet, the holes 60 of the substrate, and the holes 61 of the heat sink are accurately arranged, the operator can easily insert the positioning pin 65.
　また、ヒートシンク５３は、遮光壁５３ｄを有している。遮光壁５３ｄは、レンズケース５２の開口端５２ａから漏れる光を遮光することができる。このため、本実施形態におけるＨＵＤ１は、表示画像の光路に表示画像の光以外の光を進入させることなく、表示画像を正しく表示することができる。 Further, the heat sink 53 has a light shielding wall 53d. The light blocking wall 53 d can block light leaking from the opening end 52 a of the lens case 52. For this reason, HUD 1 in this embodiment can display a display image correctly, without making light other than the light of a display image approach into the optical path of a display image.
　次に、図９、図１０を用いて、本実施形態の変形例について説明する。 Next, a modification of the present embodiment will be described using FIGS. 9 and 10.
　図９は、図２中、表示装置３とヒートシンク５３と上ケース２１の後述する壁部とを簡略化した状態で示す要部平面図である。 FIG. 9 is a plan view of relevant parts showing the display device 3, the heat sink 53 and a wall portion of the upper case 21 described later in FIG. 2 in a simplified manner.
　図１０は、上ケース２１の要部側面図である。 FIG. 10 is a side view of an essential part of the upper case 21. As shown in FIG.
　図９（もしくは図１）において、下ケース２２は、ヒートシンク５３が重なるように設けられる一側壁部としての周壁部２２ａを有する。 In FIG. 9 (or FIG. 1), the lower case 22 has a peripheral wall 22a as one side wall provided so as to overlap the heat sink 53.
　この周壁部２２ａは、その主要部となる薄板の立壁形状からなる基部２２ｂと、この基部２２ｂとヒートシンク５３との間に微少なクリアランスからなる間隙部Ｓ１が（２箇所）形成された状態でヒートシンク５３の所要部であるフィン５３ａを下ケース２２外部に露出可能とする上述した開口部（開放部）２８とを有している。ここでの開口部２８は、ヒートシンク５３に対応する基部２２ｂ箇所を切り欠いた切り欠き部となっている。 The peripheral wall 22a has a base 22b in the form of an upright wall of a thin plate, which is the main part, and a gap S1 between the base 22b and the heat sink 53 with a minute clearance (two locations). It has the above-mentioned opening (opening) 28 which enables the fin 53a which is a required part of 53 to be exposed to the outside of the lower case 22. The opening 28 here is a cutaway portion in which the base portion 22 b corresponding to the heat sink 53 is cut out.
　なお、５３ｅは、ヒートシンク５３の周囲に設けられた鍔形状の一対の固定部である。固定部５３ｅには、ここでの詳細図示は省略するが、例えば下ケース２２とヒートシンク５３とをネジ固定するためのネジ固定構造や下ケース２２とヒートシンク５３とを位置決めするための位置決め構造等が設けられる。 Reference numeral 53 e denotes a pair of wedge-shaped fixing portions provided around the heat sink 53. Although not shown in detail here, the fixing portion 53e has, for example, a screw fixing structure for screwing the lower case 22 and the heat sink 53, a positioning structure for positioning the lower case 22 and the heat sink 53, etc. Provided.
　また、図９中、液晶表示パネル４１とレンズ５１を収納するレンズケース５２との位置関係に着目すると、液晶表示パネル４１はレンズケース５２と密着しておらず、液晶表示パネル４１とレンズケース５２との間には空間部Ｓ２が形成されるようになっている。このような場合、光源５６の点灯に伴い、レンズ部５１ａ（レンズ５１）から出射される出射光（光線）は、液晶表示パネル４１へと向かう光と、空間部Ｓ２を経てレンズケース５２の外部へと漏れる漏れ光とを含むことになる。 Further, focusing on the positional relationship between the liquid crystal display panel 41 and the lens case 52 housing the lens 51 in FIG. 9, the liquid crystal display panel 41 is not in close contact with the lens case 52, and the liquid crystal display panel 41 and the lens case 52 And a space S2 is formed between them. In such a case, when the light source 56 is turned on, the outgoing light (light beam) emitted from the lens unit 51a (lens 51) travels to the liquid crystal display panel 41, passes through the space S2, and is outside the lens case 52. And leaked light.
　なお、５２ｂは、レンズケース５２における開口端５２ａ近傍に部分的に設けられた開口窓であり、この開口窓５２ｂは、光源基板５０に実装されたコネクタ５０ａに対応して開口形成されている。そして、ここでの詳細図示は省略するが、配線コードの両端側に装着される一対のコネクタのうち一方のコネクタを開口窓５２ｂを介してコネクタ５０ａに接続し、他方のコネクタを制御基板７にコネクタ接続することで、光源５６に点灯用電力を供給可能となる。 Reference numeral 52 b denotes an opening window partially provided in the vicinity of the opening end 52 a of the lens case 52, and the opening window 52 b is formed to correspond to the connector 50 a mounted on the light source substrate 50. Then, although not shown in detail here, one connector of the pair of connectors mounted on both ends of the wiring cord is connected to the connector 50a through the opening window 52b, and the other connector is connected to the control board 7 By connecting the connector, the light source 56 can be supplied with lighting power.
　ここで、図９、図１０において、２１ａは、下ケース２２と対をなすように設けられる上ケース２１に形成されたリブ形状の（２つの）壁部である。この上ケース２１から垂下するように設けられる壁部２１ａは、上述した（２箇所の）間隙部Ｓ１を各々塞ぐように基部２２ｂ（間隙部Ｓ１）の内側に位置し、所定の光路を経て空間部Ｓ２から間隙部Ｓ１へと至る前記漏れ光等を遮光するための遮光壁（遮光リブ）としての機能を有している。 Here, in FIGS. 9 and 10, 21a is a rib-shaped (two) wall portion formed on the upper case 21 provided to be paired with the lower case 22. The wall portion 21a provided so as to hang from the upper case 21 is located inside the base portion 22b (the gap portion S1) so as to close the above-mentioned (two) gap portions S1, and a space is formed through a predetermined light path. It has a function as a light shielding wall (light shielding rib) for shielding the leakage light and the like from the portion S2 to the gap portion S1.
　ここで、所定の光路としては、例えば空間部Ｓ２、内部空間２３側に面する上ケース２１の内壁面を順次経て、下ケース２２側に反射し間隙部Ｓ１へと向かう光の光路等を挙げることができる。なお、間隙部Ｓ１へと向かう光は、これ以外に一例として光源５６から出る光線の一部がレンズケース５２の開口窓５２ｂから漏れ、上ケース２１の前記内壁面にて下ケース２２側に反射し間隙部Ｓ１へと向かう光をはじめとして様々な光がある。 Here, as the predetermined optical path, for example, an optical path of light reflected toward the lower case 22 through the inner wall surface of the upper case 21 facing the space portion S2 and the inner space 23 side sequentially to the lower case 22 is listed. be able to. In the light traveling toward the gap S1, a part of the light beam from the light source 56 leaks from the opening window 52b of the lens case 52, for example, and is reflected to the lower case 22 by the inner wall surface of the upper case 21 There are various types of light including light traveling toward the gap S1.
　このように図９、図１０にて説明した本実施形態の変形例によれば、間隙部Ｓ１を塞ぐように上ケース２１に壁部２１ａが形成されていることにより、前記漏れ光やレンズケース５２の開口窓５２ｂから漏れて間隙部Ｓ１へと向かう光を壁部２１ａによって確実に遮ることができる。従って、光源５６の点灯時において、光源５６から発せられる光線がＨＵＤ１の外部に漏れるのを確実に防ぐことができ、商品性を高めることが可能となる。 As described above, according to the modification of the embodiment described with reference to FIGS. 9 and 10, the wall 21a is formed on the upper case 21 so as to close the gap S1, the leaked light and the lens case The light leaked from the opening window 52b of 52 and directed to the gap S1 can be surely blocked by the wall 21a. Therefore, when the light source 56 is lit, it is possible to reliably prevent the light beam emitted from the light source 56 from leaking to the outside of the HUD 1 and to improve the commercial property.
　本発明のいくつかの実施形態を説明したが、これらの実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。これら新規な実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。これら実施形態やその変形は、発明の範囲や要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.
　　１　　ヘッドアップディスプレイ（ＨＵＤ）
　　３　　表示装置
　　４　　平面鏡
　　５　　 凹面鏡
　　６　　ケース
　　７　　 制御基板
　２１　　上ケース
　２１ａ　壁部（遮光壁）
　２２　　下ケース
　２２ａ　周壁部
　２２ｂ　基部
　２８　　開口部（開放部）
　３０　　 透光カバー（出射部）
　４０　　 バックライトユニット
　４１　　液晶表示パネル
　５０　　光源基板
　５１　　 レンズ
　５２　　レンズケース
　５２ａ　開口端
　５３　　 ヒートシンク
　５３ｂ 位置決め壁
　５３ｃ　設置面
　５３ｄ 遮光壁
　５４　 　熱伝導シート
　５６　 光源
　６０　　 第１の位置決め穴（基板の穴）
　６１　　第２の位置決め穴（ヒートシンクの穴）
　６２　　 第３の位置決め穴（シートの穴）
　６５　　位置決めピン
　Ｓ１　　間隙部
　Ｓ２　　空間部 1 Head-up display (HUD)
Reference Signs List 3 display device 4 plane mirror 5 concave mirror 6 case 7 control board 21 upper case 21 a wall portion (light shielding wall)
22 lower case 22a peripheral wall 22b base 28 opening (opening)
30 Translucent cover (emitting part)
DESCRIPTION OF SYMBOLS 40 Backlight unit 41 Liquid crystal display panel 50 Light source substrate 51 Lens 52 Lens case 52a Opening end 53 Heat sink 53b Positioning wall 53c Installation surface 53d Light shielding wall 54 Heat conduction sheet 56 Light source 60 1st positioning hole (hole of substrate)
61 2nd positioning hole (hole of heat sink)
62 3rd positioning hole (hole in sheet)
65 Positioning pin S1 Gap S2 Space

Claims (6)

  1. 光源が実装された基板と、
    前記光源の熱を伝える熱伝導シートと、
    前記熱伝導シートから伝わる熱を放熱し、前記基板及び前記熱伝導シートを設置する設置面と、前記基板及び前記熱伝導シートを前記設置面の面方向に関して位置決めする位置決め壁とを有するヒートシンクと、を備えることを特徴とするバックライトユニット。     A substrate on which a light source is mounted,
    A heat transfer sheet for transferring the heat of the light source;
    A heat sink having a mounting surface on which the substrate and the heat conductive sheet are installed, and a positioning wall for positioning the substrate and the heat conductive sheet with respect to the surface direction of the mounting surface; A backlight unit comprising:
  2. 前記光源からの光線を集光させるレンズをさらに備え、
    前記基板は、第１の位置決め穴を有し、
    前記ヒートシンクは、第２の位置決め穴を有し、
    前記熱伝導シートは、前記第２の位置決め穴よりも大きい第３の位置決め穴を有し、
    前記レンズは、前記第１の位置決め穴、前記第３の位置決め穴、及び前記第２の位置決め穴に順に挿入されることにより、前記ヒートシンクに対して位置決めする位置決めピンを有することを特徴とする請求項１記載のバックライトユニット。     It further comprises a lens for collecting light from the light source,
    The substrate has a first positioning hole,
    The heat sink has a second positioning hole,
    The heat conduction sheet has a third positioning hole larger than the second positioning hole,
    The lens is characterized in that it has a positioning pin for positioning with respect to the heat sink by being sequentially inserted into the first positioning hole, the third positioning hole, and the second positioning hole. The backlight unit according to Item 1.
  3. 前記ヒートシンクに取り付けられ、前記レンズ及び前記基板を収容し、前記設置面に面する開口端を有するレンズケースをさらに備え、
    前記ヒートシンクは、前記設置面と前記開口端との距離以上の高さを有する遮光壁を有することを特徴とする請求項１または２記載のバックライトユニット。     The lens case further includes a lens case attached to the heat sink, accommodating the lens and the substrate, and having an open end facing the installation surface.
    The backlight unit according to claim 1, wherein the heat sink has a light shielding wall having a height equal to or greater than a distance between the installation surface and the opening end.
  4. 請求項１に記載の前記バックライトユニットと液晶表示パネルとを有し、表示光を出力する表示装置と、
    前記表示光を反射させる反射鏡と、を有し、
    前記反射鏡によって反射された前記表示光を透過反射部に照射することを特徴とするヘッドアップディスプレイ。     A display device comprising the backlight unit according to claim 1 and a liquid crystal display panel and outputting display light.
    And a reflecting mirror for reflecting the display light.
    A head-up display characterized in that the display light reflected by the reflecting mirror is irradiated to a transmission / reflection unit.
  5. 前記表示光を前記透過反射部へと出射する出射部を有する上ケースと、前記ヒートシンクが重なるように設けられる周壁部を有する下ケースとを備え、
    前記周壁部は、その主要部となる基部と、前記基部と前記ヒートシンクとの間に間隙部が形成された状態で前記ヒートシンクの所要部を前記下ケースの外部に露出可能とする開放部とを有し、
    前記上ケースには前記間隙部を塞ぐように壁部が形成されていることを特徴とする請求項４記載のヘッドアップディスプレイ。     An upper case having an emission portion for emitting the display light to the transmission / reflection portion, and a lower case having a peripheral wall portion provided so as to overlap the heat sink;
    The peripheral wall portion includes a base serving as the main portion, and an open portion capable of exposing the required portion of the heat sink to the outside of the lower case in a state where a gap is formed between the base and the heat sink. Have
    5. The head-up display according to claim 4, wherein a wall is formed in the upper case so as to close the gap.
  6. 前記液晶表示パネルと前記レンズケースとの間には空間部が形成され、
    前記レンズから出射される出射光は前記空間部を経て前記レンズケースの外部へと漏れる漏れ光を少なくとも含み、
    前記壁部は、所定の光路を経て前記空間部から前記間隙部へと至る前記漏れ光を遮光する遮光壁としての機能を有していることを特徴とする請求項５記載のヘッドアップディスプレイ。     A space is formed between the liquid crystal display panel and the lens case,
    The emitted light emitted from the lens at least includes leaked light that leaks to the outside of the lens case through the space portion,
    6. The head-up display according to claim 5, wherein the wall portion has a function as a light shielding wall that shields the leaked light reaching the space from the space through a predetermined optical path.
PCT/JP2018/024269 2017-06-30 2018-06-27 Backlight unit and heads-up display WO2019004239A1 (en)

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
GB2603039A (en) * 2021-01-20 2022-07-27 Continental Automotive Gmbh Head-up display

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US20090154180A1 (en) * 2007-12-18 2009-06-18 Sl Seobong Heat-dissipating apparatus
JP2010006196A (en) * 2008-06-26 2010-01-14 Nippon Seiki Co Ltd Light emitting display device
JP2012529145A (en) * 2009-06-24 2012-11-15 エルポイント カンパニー，リミテッド Module circuit board and frame coupling device and backlight using the same
JP2013004423A (en) * 2011-06-20 2013-01-07 Koito Mfg Co Ltd Vehicular lamp

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US20090154180A1 (en) * 2007-12-18 2009-06-18 Sl Seobong Heat-dissipating apparatus
JP2010006196A (en) * 2008-06-26 2010-01-14 Nippon Seiki Co Ltd Light emitting display device
JP2012529145A (en) * 2009-06-24 2012-11-15 エルポイント カンパニー，リミテッド Module circuit board and frame coupling device and backlight using the same
JP2013004423A (en) * 2011-06-20 2013-01-07 Koito Mfg Co Ltd Vehicular lamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2603039A (en) * 2021-01-20 2022-07-27 Continental Automotive Gmbh Head-up display

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