JP2009199971A - Lighting device - Google Patents

Lighting device Download PDF

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Publication number
JP2009199971A
JP2009199971A JP2008042458A JP2008042458A JP2009199971A JP 2009199971 A JP2009199971 A JP 2009199971A JP 2008042458 A JP2008042458 A JP 2008042458A JP 2008042458 A JP2008042458 A JP 2008042458A JP 2009199971 A JP2009199971 A JP 2009199971A
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JP
Japan
Prior art keywords
light
guide member
light sources
light guide
lighting device
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
JP2008042458A
Other languages
Japanese (ja)
Inventor
Takayuki Hatano
Takuo Hirokawa
拓郎 広川
貴之 波田野
Original Assignee
Nippon Seiki Co Ltd
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 Nippon Seiki Co Ltd, 日本精機株式会社 filed Critical Nippon Seiki Co Ltd
Priority to JP2008042458A priority Critical patent/JP2009199971A/en
Publication of JP2009199971A publication Critical patent/JP2009199971A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device that reduces lighting variations. <P>SOLUTION: A lighting device 1 includes light sources 2 and an optical waveguide member 3, wherein the light emitted from the light sources 2 comes in from an optical incoming section 3a of the optical waveguide member 3, and goes out from an optical outgoing section 3b of the optical waveguide member 3 to illuminate a member being lighted. The optical waveguide member 3 is in the approximately circular form, and a plurality of light sources 2 are provided. The light sources 2 are disposed at a peripheral portion of the optical waveguide member 3, so that all the outgoing directions of light emitted from the plurality of light sources 2 may intersect with each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an illuminating device that irradiates light from the back surface of a display element such as a liquid crystal panel, and more particularly to an illuminating device that is employed in the display element having an outer shape that is substantially circular.

Conventionally, a liquid crystal display device is used as a display device of a small and thin device such as a book-type computer, a mobile phone, or a mobile TV. In addition, liquid crystal display devices have come to be used as display devices for displaying vehicle information and traffic information in vehicle meters. These liquid crystal display devices include an illumination device that irradiates a liquid crystal panel. The illumination device includes a light source and a light guide plate that converts a light beam of the light source into a planar light beam that is optimal for irradiation of the liquid crystal panel. It was a thing.
Japanese Patent Laid-Open No. 2006-118892

  However, in recent years, the display area of a display device has been increased in a vehicle instrument, particularly a vehicle instrument using a pointer. Along with this, in order to arrange this enlarged display device at the center of rotation of the pointer, a liquid crystal panel having a substantially circular display area and outer shape has been developed, and accordingly, the light emitting area and outer shape of the illumination device are also substantially reduced. There is a growing demand for a circular shape. With the increase in the size of this display device, there has been a problem that uneven illumination in the display area is easily noticeable.

  Therefore, the present invention has been made in view of this demand, and provides an illumination device that suppresses uneven illumination.

  The present invention includes a light source and a light guide member, and light emitted from the light source is incident from a light incident portion of the light guide member and emitted from a light exit portion of the light guide member. In the illuminating device that illuminates, the light guide member has a substantially circular shape, includes a plurality of the light sources, and the light sources are arranged on the periphery of the light guide member so that all emission directions of the light emitted from the plurality of light sources intersect each other. It is a thing.

  In the present invention, the periphery of the light guide member is equally divided by the number of the plurality of light sources, and the light sources are arranged in the equally divided periphery.

  In the present invention, the angle between the light sources is 360 / n (unit is degree, n is the number of light sources, n ≧ 3 and odd number).

  Moreover, this invention provides the said light-incidence part in the side surface of the said light guide member.

  In the present invention, the light incident portion is formed in a planar shape.

  In the present invention, a light reflecting portion having fine irregularities is provided on the lower surface side of the light emitting portion.

  ADVANTAGE OF THE INVENTION According to this invention, the intended objective can be achieved and the illuminating device which suppressed the illumination nonuniformity can be provided.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  The illuminating device 1 according to this embodiment includes a light source 2, a light guide member 3, a substrate 4, an upper case 10, a lower case 12, a reflective sheet 14, a prism sheet 16, and a diffusion sheet 18. It is configured.

  The light source 2 is, for example, a light emitting diode. A plurality of light sources 2 are provided, and in the present embodiment, seven light sources are provided. The light source 2 is disposed on the periphery of the light guide member 3 and so as to face the side surface of the light guide member 3.

  The light guide member 3 is made of a synthetic resin that can transmit light, and is a flat plate having an upper surface and a lower surface that are parallel to each other, and has a circular shape when viewed from the front (see FIG. 3). The light emitted from the light source 2 is incident from the light incident portion 3 a on the side surface of the light guide member 3 and is emitted from the light emitting portion 3 b on the upper surface of the light guide member 3. The emitted light illuminates a member to be illuminated, for example, a display element such as a liquid crystal display panel. In the present embodiment, the light guide member 3 has a circular shape when viewed from the front. However, in the present invention, the light guide member 3 may have a substantially circular shape, for example, a portion of the light incident portion 3a facing the light source 2. May be flat.

  A light reflecting portion 3 c is provided on the lower surface of the light emitting portion 3 b of the light guide member 3. The light reflecting portion 3 c reflects light incident from the light incident portion 3 a of the light guide member 3 to the light exit surface 3 b of the light guide member 3. The light reflecting portion 3c is composed of fine irregularities, and in this embodiment, the number of irregularities increases as the distance from the light source 2 increases with respect to the light emitting direction of the light source 2. Moreover, since the light emitted from the light source 2 is strong in the vicinity of the light source 2, the light reflection unit 3 c has a region with a small number of projections and depressions in a predetermined range (see FIG. 3).

  The substrate 4 is electrically connected to the light source 2, and supplies power from a power source (not shown) to the light source 2 through the substrate 4. The base material of the substrate 4 is made of a hard material such as aluminum, and is provided with an insulating layer and a wiring pattern (not shown). A reflective layer 4a is provided on the upper surface of the substrate 4 (the surface on the light guide member 3 side), and the reflective layer 4a is formed of white silk or resist 4a. This is to reflect the light leaking from the light guide member 3 to the light guide member 3 again. The effect of diffusing the heat generated by the light source 2 can be expected by using a metal for the base material of the substrate 4.

  A reflection sheet 14 is provided between the light guide member 3 and the substrate 4. The reflection sheet 14 is a thin plate made of synthetic resin, and has an effect of favorably reflecting light leaking from the lower surface of the light guide member 3 and increasing illumination efficiency.

  On the light emitting surface 3b of the light guide member 3, two prism sheets 16 and a diffusion sheet 18 are provided in a laminated state. One diffusion sheet 18 is disposed on the light guide member 3, then two prism sheets 16 are disposed on the first diffusion sheet 18, and finally the second diffusion sheet is disposed on the prism sheet 16. A sheet 18 is disposed.

  The prism sheet 16 is a thin plate made of synthetic resin, and includes a plurality of parallel grooves having a prism effect. The two prism sheets 16 are arranged so that the plurality of grooves are substantially orthogonal to each other, and there is an effect that the light from the light guide 3 can be radiated to a member to be illuminated, not shown.

  The diffusion sheet 18 has a thin plate shape made of a synthetic resin, and has an effect of diffusing light from the light exit surface 3b and mainly reducing illumination unevenness.

  The upper case 10 and the lower case 12 are made of a white synthetic resin, and are fixed by means (not shown), and the light guide member 3, the substrate 4, the reflection sheet 14, the prism sheet 16, and the diffusion sheet 18 are fixed. Reference numeral 19 denotes a spacer, which is made of a white synthetic resin and fills a space formed between the light guide member 3 and the upper case 10 and between the light sources 2. In the present embodiment, the spacer All 19 are connected. This spacer 19 has an effect of favorably reflecting light leaking from the side surface of the light guide member 3 and increasing the illumination efficiency.

  The light source 2 is disposed on the periphery of the light guide member 3 so that the emission directions L of the light emitted from the plurality of light sources 2 all intersect.

  The intervals at which the plurality of light sources 2 are arranged are equal, and the angle between the light sources 2 is 360 / n (unit is degrees, n is the number of light sources, n ≧ 3 and odd number) Is required. In the present embodiment, since seven light sources 2 are arranged, the angle between the light sources 2 is 360/7, which is about 51.43 degrees.

  In the present invention, by providing the light source 2 on the periphery of the light guide member 3 so that the emission directions L of the light emitted from the plurality of light sources 2 all intersect, it is possible to provide the illumination device 1 that suppresses uneven illumination. it can. Also, the fact that all the emission directions L of the light emitted from the light source 2 intersect each other means that one light source 2 irradiates light toward the other light source 2 because an arbitrary light source 2 does not face directly. Therefore, it is possible to suppress illumination unevenness caused by the concentration of light.

  In the present invention, the light sources 2 are arranged at equal intervals, and the number of the light sources 2 is an odd number, so that the light source 2 is provided on the side opposite to the side where the light sources 2 are provided of the light guide member 3. Not placed. Accordingly, a large number of light reflecting portions 3c are provided on the side of the light guide member 3 opposite to the side where the light source 2 is provided, and light can be favorably reflected to the light emitting surface 3b. The luminance for illuminating the member can be improved, and the illumination device 1 with reduced illumination unevenness can be provided. The present invention is particularly effective when a light source with high directivity is used as the light source 2.

  Further, by providing the light incident portion 3a on the side surface of the light guide member 3, the light emitted from the light source 2 can enter the light guide member 3 in parallel to the plate surface direction of the light guide member 3. The light from the light source 2 can be efficiently taken into the light guide member 3.

  FIG. 4 shows a second embodiment of the present invention, and particularly relates to the arrangement of the light source 2.

  In the present embodiment, the light source 5 is provided behind the light guide member 6, the light incident part 6 a of the light guide member 6 is provided on the back surface and the periphery of the light guide member 6, and is incident from the light incident part 6 a. A light reflecting surface 6 d that reflects the reflected light toward the center of the light guide member 6 is provided around the light guide member 6. The reflecting portion 6d is at an angle of 45 degrees with respect to the surface of the light incident portion 6a. The light that has entered the light guide member 6 is emitted from the light emitting portion 6b.

  In each of the above embodiments, the light sources 2 are arranged at equal intervals. However, the present invention is not limited to this embodiment, and the light sources 2 may be arranged at equal intervals according to various conditions such as the shape of the product. If this is not possible, the periphery of the light guide member 3 may be equally divided by the number of light sources 2 provided, and each light source 2 may be disposed within each equally divided periphery. In this case, illumination unevenness can be suppressed by arranging the light source 2 on the equally divided periphery. In this case, the number of light sources 2 is not limited to an odd number, and may be an even number.

The front view of 1st Embodiment of this invention. Sectional drawing of the AA line in FIG. Sectional drawing of the BB line in FIG. Sectional drawing of 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Illuminating device 2, 5 Light source 3, 6 Light guide member 3a, 6a Light incident part 3b, 6b Light emission part 3c Light reflection part 4 Substrate 4a Reflection layer 6d Light reflection surface 10 Upper case 12 Lower case 14 Reflective sheet 16 Prism sheet 18 Diffusion sheet 19 Spacer

Claims (6)

  1. An illumination device comprising a light source and a light guide member, wherein light emitted from the light source is incident from a light incident portion of the light guide member and is emitted from the light output portion of the light guide member to illuminate a member to be illuminated The light guide member has a substantially circular shape, includes a plurality of the light sources, and the light sources are arranged on the periphery of the light guide member so that all emission directions of the light emitted from the plurality of light sources intersect each other. A lighting device.
  2. The lighting device according to claim 1, wherein a periphery of the light guide member is equally divided by the number of the plurality of light sources, and the light sources are arranged in the equally divided periphery.
  3. The lighting device according to claim 1, wherein the angle between the light sources is 360 / n (unit is degrees, n is the number of light sources, n ≧ 3 and odd number).
  4. The lighting device according to claim 1, wherein the light incident portion is provided on a side surface of the light guide member.
  5. The lighting device according to claim 1, wherein the light incident portion is formed in a planar shape.
  6. The lighting device according to claim 1, wherein a light reflecting portion made of fine irregularities is provided on a lower surface side of the light emitting portion.
JP2008042458A 2008-02-25 2008-02-25 Lighting device Pending JP2009199971A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008042458A JP2009199971A (en) 2008-02-25 2008-02-25 Lighting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008042458A JP2009199971A (en) 2008-02-25 2008-02-25 Lighting device

Publications (1)

Publication Number Publication Date
JP2009199971A true JP2009199971A (en) 2009-09-03

Family

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Family Applications (1)

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JP2008042458A Pending JP2009199971A (en) 2008-02-25 2008-02-25 Lighting device

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Country Link
JP (1) JP2009199971A (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011091047A (en) * 2009-10-26 2011-05-06 Young Lighting Technology Inc Light source device
CN102162604A (en) * 2010-01-29 2011-08-24 住友化学株式会社 Edge-light type lighting device
JP2011170986A (en) * 2010-02-16 2011-09-01 I-Ene Planning Co Ltd Circular or elliptic light emitting plate using led edge light
JP2011192448A (en) * 2010-03-12 2011-09-29 Kuraray Co Ltd Light guide plate, and surface light source device
JP2012074216A (en) * 2010-09-28 2012-04-12 Sharp Corp Lighting system
JP2012195306A (en) * 2012-07-09 2012-10-11 Sumitomo Chemical Co Ltd Edge light type lighting device
JP2013180124A (en) * 2012-03-02 2013-09-12 Nippon Mektron Ltd Light-emitting module
WO2014155955A1 (en) * 2013-03-29 2014-10-02 パナソニック株式会社 Illumination device
US8876351B2 (en) 2011-03-14 2014-11-04 Young Lighting Technology Inc. Light emitting diode lamp having heat dissipation module
JP2015069771A (en) * 2013-09-27 2015-04-13 株式会社クラレ Planar light emitting body
WO2016104352A1 (en) * 2014-12-26 2016-06-30 シャープ株式会社 Illumination device and display device
WO2016104348A1 (en) * 2014-12-26 2016-06-30 シャープ株式会社 Display device
WO2016104357A1 (en) * 2014-12-26 2016-06-30 シャープ株式会社 Illumination device and display device
WO2016133008A1 (en) * 2015-02-19 2016-08-25 シャープ株式会社 Illuminating device and display device
WO2016143659A1 (en) * 2015-03-10 2016-09-15 シャープ株式会社 Display device
CN107111048A (en) * 2014-12-26 2017-08-29 夏普株式会社 Lighting device and display device
CN107209322A (en) * 2015-02-13 2017-09-26 夏普株式会社 Lighting device and display device
US20170359867A1 (en) * 2014-12-26 2017-12-14 Sharp Kabushiki Kaisha Lighting device and display device

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011091047A (en) * 2009-10-26 2011-05-06 Young Lighting Technology Inc Light source device
CN102162604A (en) * 2010-01-29 2011-08-24 住友化学株式会社 Edge-light type lighting device
JP2011170986A (en) * 2010-02-16 2011-09-01 I-Ene Planning Co Ltd Circular or elliptic light emitting plate using led edge light
JP2011192448A (en) * 2010-03-12 2011-09-29 Kuraray Co Ltd Light guide plate, and surface light source device
JP2012074216A (en) * 2010-09-28 2012-04-12 Sharp Corp Lighting system
US8876351B2 (en) 2011-03-14 2014-11-04 Young Lighting Technology Inc. Light emitting diode lamp having heat dissipation module
JP2013180124A (en) * 2012-03-02 2013-09-12 Nippon Mektron Ltd Light-emitting module
JP2012195306A (en) * 2012-07-09 2012-10-11 Sumitomo Chemical Co Ltd Edge light type lighting device
WO2014155955A1 (en) * 2013-03-29 2014-10-02 パナソニック株式会社 Illumination device
JP2014199758A (en) * 2013-03-29 2014-10-23 パナソニック株式会社 Illumination device
CN105074326A (en) * 2013-03-29 2015-11-18 松下知识产权经营株式会社 Illumination device
JP2015069771A (en) * 2013-09-27 2015-04-13 株式会社クラレ Planar light emitting body
US10268075B2 (en) 2014-12-26 2019-04-23 Sharp Kabushiki Kaisha Lighting device and display device
WO2016104348A1 (en) * 2014-12-26 2016-06-30 シャープ株式会社 Display device
WO2016104357A1 (en) * 2014-12-26 2016-06-30 シャープ株式会社 Illumination device and display device
US10281766B2 (en) 2014-12-26 2019-05-07 Sharp Kabushiki Kaisha Lighting device and display device
CN107110476B (en) * 2014-12-26 2019-11-19 夏普株式会社 Lighting device and display device
WO2016104352A1 (en) * 2014-12-26 2016-06-30 シャープ株式会社 Illumination device and display device
CN107110476A (en) * 2014-12-26 2017-08-29 夏普株式会社 Lighting device and display device
CN107110441A (en) * 2014-12-26 2017-08-29 夏普株式会社 Lighting device and display device
CN107111048A (en) * 2014-12-26 2017-08-29 夏普株式会社 Lighting device and display device
US10209428B2 (en) 2014-12-26 2019-02-19 Sharp Kabushiki Kaisha Lighting device and display device
JPWO2016104357A1 (en) * 2014-12-26 2017-10-05 シャープ株式会社 Lighting device and display device
TWI643006B (en) * 2014-12-26 2018-12-01 日商夏普股份有限公司 Lighting device, and display device
US20170359867A1 (en) * 2014-12-26 2017-12-14 Sharp Kabushiki Kaisha Lighting device and display device
US10018868B2 (en) 2014-12-26 2018-07-10 Sharp Kabushiki Kaisha Optical and positioning structures, illumination device, and display device having the same
US10353132B2 (en) 2014-12-26 2019-07-16 Sharp Kabushiki Kaisha Display device
JPWO2016129514A1 (en) * 2015-02-13 2017-11-16 シャープ株式会社 Lighting device and display device
CN107209322A (en) * 2015-02-13 2017-09-26 夏普株式会社 Lighting device and display device
US10209432B2 (en) 2015-02-13 2019-02-19 Sharp Kabushiki Kaisha Lighting device and display device
US10502888B2 (en) 2015-02-19 2019-12-10 Sharp Kabushiki Kaisha Lighting device and display device
WO2016133008A1 (en) * 2015-02-19 2016-08-25 シャープ株式会社 Illuminating device and display device
US10036909B2 (en) 2015-03-10 2018-07-31 Sharp Kabushiki Kaisha Display device
WO2016143659A1 (en) * 2015-03-10 2016-09-15 シャープ株式会社 Display device
JPWO2016143659A1 (en) * 2015-03-10 2017-04-27 シャープ株式会社 Display device

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