WO2008044417A1 - Appareil d'éclairage - Google Patents

Appareil d'éclairage Download PDF

Info

Publication number
WO2008044417A1
WO2008044417A1 PCT/JP2007/067698 JP2007067698W WO2008044417A1 WO 2008044417 A1 WO2008044417 A1 WO 2008044417A1 JP 2007067698 W JP2007067698 W JP 2007067698W WO 2008044417 A1 WO2008044417 A1 WO 2008044417A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
guide member
light guide
illumination
liquid crystal
Prior art date
Application number
PCT/JP2007/067698
Other languages
English (en)
Japanese (ja)
Inventor
Yasushi Akiyama
Original Assignee
Nippon Seiki Co., Ltd.
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 Nippon Seiki Co., Ltd. filed Critical Nippon Seiki Co., Ltd.
Publication of WO2008044417A1 publication Critical patent/WO2008044417A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces

Definitions

  • the present invention relates to a lighting device, and particularly to a lighting device that illuminates a member to be illuminated such as a liquid crystal display panel.
  • the liquid crystal display device 1 includes a liquid crystal display panel 2 and a knock light device 3 that transmits and illuminates the liquid crystal display panel 2 (see FIG. 6).
  • the knocklight device 3 includes a light emitting diode 4, a light guide member 5, and a light diffusing plate 6.
  • the liquid crystal display panel 2 is illuminated from the back side by the backlight device 3, and the user of the liquid crystal display device 1 can visually recognize the display content of the liquid crystal display panel 2 even in a dark place.
  • Patent Document 1 Japanese Patent Laid-Open No. 2000-340388
  • the liquid crystal display panel 2 transmitted and illuminated by the backlight device 3 may not have uniform brightness.
  • the illumination light L emitted from the light emitting diode 4 of the knocklight device 3 spreads radially inside the light guide member 5, so that a portion near the light emitting diode 4 is compared with a portion far from the bright light emitting diode 4. It had the problem of being ugly.
  • the present invention has been made in view of this problem, and provides an illuminating device that can illuminate a member to be illuminated with substantially uniform brightness.
  • the present invention comprises a plurality of point light sources 25 that emit illumination light L, and a light guide member 26 that guides the illumination light L to an illumination member 23,
  • the illumination device 24 illuminates the illuminated member 23, and the light guide member 26 is emitted from the point light source 25.
  • a reflecting surface 26b to be reflected.
  • the incident surface 26a of the light guide member 26 is
  • the reflection surface 26b of the light guide member 26 includes:
  • the light guide member 26 includes a flat surface provided at a location corresponding to each of the plurality of reflective surfaces 26a. It has a second reflecting surface 26c for further reflecting the reflected illumination light L.
  • the illumination light emitted from the point light source can be condensed on the incident surface and the reflection surface of the light guide member, and the member to be illuminated can be illuminated with substantially uniform brightness.
  • FIG. 1 is a front view of a vehicular instrument showing an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of a vehicle instrument according to the embodiment.
  • FIG. 3 is a front view of a liquid crystal display device showing the embodiment.
  • FIG. 4 is a cross-sectional view, a rear view, and a front view of a light guide member showing the embodiment.
  • FIG. 5 is a cross-sectional view of a liquid crystal display device showing the embodiment.
  • FIG. 6 is a cross-sectional view showing a conventional example.
  • Reference numeral 8 denotes a housing.
  • the housing 8 accommodates an indicator instrument to be described later.
  • 9 is a facing member, and this facing member 9 is locked to the housing 8 by a locking claw (not shown).
  • Reference numeral 10 denotes a translucent cover, and the translucent cover 10 includes a curved portion 10a and a rib portion 10b.
  • the translucent cover 10 is made of a translucent resin such as acrylic or polycarbonate.
  • the translucent cover 10 is locked to the facing member 9 by locking claws (not shown) provided on the rib portion 10b.
  • a fuel gauge 11a a fuel gauge 11a, a speedometer l ib, a tachometer 11 1c, and a water temperature gauge l i d are housed in the wing 8.
  • the speedometer l ib and the tachometer 11c are larger than the fuel gauge 11a and the water temperature gauge l id and are arranged between the fuel gauge 11a and the water temperature gauge id.
  • the turning member 9 has a circular opening 9a, 9b, 9c, 9d corresponding to the fuel gauge 11a, the speedometer l ib, the tachometer 11c, and the water temperature gauge 1 Id.
  • Each indicating instrument 11 a, ib, 11 c, and id has a dial plate 12, a light emitting element 13, a light guide member 14, a finger 15, a stepping motor 16 and a circuit board 17.
  • the dial 12 is formed by printing a semi-transparent layer made of a transparent ink on the indicator portion 18 on a light-transmitting substrate made of a resin such as PC (polyplastic-bonate). The layer is printed.
  • the light emitting element 13 and the light guide member 14 are arranged behind the dial plate 12, and the indicator portion 18 is transmitted and illuminated by the light from the light emitting element 13.
  • the pointer 15 is rotated by a stepping motor 16 to indicate the indicator portion 18 of the dial 12.
  • the light of the light emitting element 13 is guided to the pointer 15 by the reflecting surface 14a of the light guide member 14, and the indicator 19 of the pointer 15 shines.
  • Reference numeral 20 denotes a liquid crystal display, and the liquid crystal display 20 is arranged behind the dial 12 of the speedometer ib.
  • the dial 12 has a rectangular opening 12a, and the liquid crystal display 20 is disposed at a position corresponding to the opening 12a.
  • Reference numeral 22 denotes a case body.
  • the case body 22 holds the liquid crystal display 20!
  • the liquid crystal display 20 is connected to the liquid crystal display panel 23 and back. It consists of a light device 24 (see Fig. 5).
  • the knocklight device 24 includes a light emitting diode 25, a light guide member 26, and a light diffusing plate 27.
  • the light emitting diode 25 is mounted on the wiring board 28.
  • FIG. 4 (a) is a cross-sectional view of the light guide member 26 and will be described with the horizontal direction of the paper as the X axis, the vertical direction of the paper as the Z axis, and the vertical direction of the paper as the Y axis.
  • FIG. 4B is a view of the light guide member 26 as viewed from the back side, in which the horizontal direction of the paper surface is the X axis, the vertical direction of the paper surface is the Y axis, and the vertical force axis of the paper surface.
  • FIG. 4 (a) is a cross-sectional view of the light guide member 26 and will be described with the horizontal direction of the paper as the X axis, the vertical direction of the paper as the Z axis, and the vertical direction of the paper as the Y axis.
  • FIG. 4B is a view of the light guide member 26 as viewed from the back side, in which the horizontal direction of the paper surface is the X axis, the vertical direction of the paper surface is the
  • FIG. 4 (c) is a view of the light guide member 26 as viewed from the exit surface side, where the horizontal direction of the paper is the X axis, the vertical direction of the paper is the Y axis, and the vertical direction of the paper is the Z axis.
  • the light guide member 26 is made of a translucent resin such as PMMA (so-called acrylic).
  • the light guide member 26L receives the illumination light L emitted from the light emitting diode 25, and the illumination light guided by the light receiver 26.
  • an illumination unit 26H that illuminates the liquid crystal display panel 23, which is an illuminated member, at L.
  • the light receiving portion 26L of the light guide member 26 includes an incident surface 26a, a first reflecting surface 26b, and a second reflecting surface 26c.
  • the incident surface 26a is a convex cylindrical surface, and the illumination light L emitted from the light emitting diode 25 is condensed and incident.
  • the first reflecting surface 26b is a conical surface with the Z axis as the central axis, and is provided at a location corresponding to each of the plurality of light emitting diodes 25.
  • the first reflecting surface 26b has a convex shape in appearance, and is optically concave.
  • the first reflecting surface 26b further condenses the illumination light L incident from the incident surface 26a, and then the second reflecting surface. Reflect toward 26c.
  • the second reflecting surface 26c is a flat surface and is provided at a location corresponding to each of the plurality of first reflecting surfaces 26b.
  • the illumination part 26H of the light guide member 26 has a substantially wedge shape in cross section, and has a back surface 26d and an output surface 26e.
  • the emission surface 26e is a flat surface facing the light diffusion plate 27 and the liquid crystal display panel 23.
  • the light emitted from the light emitting diode 25 is refracted at the incident surface 26 a of the light guide member 26 and is condensed in Y axis view. However, it spreads radially in the Z-axis view (see Fig. 4 (b)).
  • the illumination light L incident from the incident surface 26a is reflected by the first reflecting surface 26b and collected in the X-axis view.
  • the illumination light L reflected by the first reflecting surface 26 is incident on the second reflecting surface 26c. The light is further reflected and guided to the illumination unit 26H.
  • the illumination light L emitted from the light emitting diode 25 is condensed on the incident surface 26a of the light guide member 26, and the first light guide member 26
  • the light can be further condensed by the reflecting surface 26b, and the illumination unit 26H of the light guide member 26 can illuminate the liquid crystal display panel 23, which is an illuminated member, with substantially uniform brightness.
  • the present invention can be used in a liquid crystal display device including a backlight device that transmits and illuminates a liquid crystal display panel.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

Un appareil d'éclairage (24) est doté d'une pluralité de sources de lumière ponctuelles (25) qui émettent une lumière d'éclairage (L), et d'un élément de guidage de lumière (26) pour guider la lumière d'éclairage (L) sur un élément (23) devant être éclairé. L'élément de guidage de lumière (26) est doté d'une surface d'incidence de lumière (26a) collectant la lumière d'éclairage (L) émise par les sources de lumière ponctuelles (25), et d'une surface réfléchissante (26b) composée de surfaces cintrées disposées au niveau de zones correspondant aux sources de lumière ponctuelles (25) respectivement, collectant plus encore la lumière d'éclairage (L) entrée par la surface d'incidence de lumière (26a) et la réfléchir. La surface d'incidence de lumière (26a) de l'élément de guidage de lumière (26) est une surface cylindrique. La surface réfléchissante (26b) de l'élément de guidage de lumière (26) est une surface conique. L'élément de guidage de lumière (26) est munie d'une seconde surface réfléchissante (26c) réfléchissant plus encore la lumière d'éclairage (L) réfléchie par la surface réfléchissante (26b).
PCT/JP2007/067698 2006-10-10 2007-09-12 Appareil d'éclairage WO2008044417A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006-276037 2006-10-10
JP2006276037A JP2008097901A (ja) 2006-10-10 2006-10-10 照明装置

Publications (1)

Publication Number Publication Date
WO2008044417A1 true WO2008044417A1 (fr) 2008-04-17

Family

ID=39282626

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/067698 WO2008044417A1 (fr) 2006-10-10 2007-09-12 Appareil d'éclairage

Country Status (2)

Country Link
JP (1) JP2008097901A (fr)
WO (1) WO2008044417A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010055940A1 (fr) * 2008-11-17 2010-05-20 アルプス電気株式会社 Dispositif d'éclairage et procédé pour fabriquer une plaque de guidage de lumière utilisée dans celui-ci
JP2011241347A (ja) * 2010-05-21 2011-12-01 Unitika Ltd ポリ乳酸系樹脂組成物、ポリ乳酸系耐熱シートおよび成形体
JP2012134124A (ja) * 2010-12-01 2012-07-12 Seiko Instruments Inc 照明装置及びこれを備える液晶表示装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5316322B2 (ja) * 2009-09-02 2013-10-16 富士通株式会社 携帯端末装置
CN102734750A (zh) * 2012-06-07 2012-10-17 惠州市德赛视听科技有限公司 长条形发光柱

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1020055A (ja) * 1996-07-09 1998-01-23 Yazaki Corp 計器等の照明構造
JP2000268620A (ja) * 1999-03-15 2000-09-29 Calsonic Kansei Corp 計器の照明装置
JP2002122743A (ja) * 2000-08-11 2002-04-26 Enplas Corp 導光板、面光源装置及び表示装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1020055A (ja) * 1996-07-09 1998-01-23 Yazaki Corp 計器等の照明構造
JP2000268620A (ja) * 1999-03-15 2000-09-29 Calsonic Kansei Corp 計器の照明装置
JP2002122743A (ja) * 2000-08-11 2002-04-26 Enplas Corp 導光板、面光源装置及び表示装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010055940A1 (fr) * 2008-11-17 2010-05-20 アルプス電気株式会社 Dispositif d'éclairage et procédé pour fabriquer une plaque de guidage de lumière utilisée dans celui-ci
JP5281095B2 (ja) * 2008-11-17 2013-09-04 アルプス電気株式会社 照明装置及びこれに用いる導光板並びにこの導光板の製造方法
JP2011241347A (ja) * 2010-05-21 2011-12-01 Unitika Ltd ポリ乳酸系樹脂組成物、ポリ乳酸系耐熱シートおよび成形体
JP2012134124A (ja) * 2010-12-01 2012-07-12 Seiko Instruments Inc 照明装置及びこれを備える液晶表示装置

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