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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light
guide member
light guide
light sources
lighting device
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JP2008042458A
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Japanese (ja)
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Takayuki Hatano
貴之 波田野
Takuo Hirokawa
拓郎 広川
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Nippon Seiki Co Ltd
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Nippon Seiki Co Ltd
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Priority to JP2008042458A priority Critical patent/JP2009199971A/en
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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

本発明は、例えば、液晶パネルなどの表示素子の背面から光を照射する照明装置に関するもので、特に、外形が略円形状である前記表示素子に採用される照明装置に関する。   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.

従来、ブック型のコンピュータ、携帯電話機または携帯テレビのような小型、薄型の機器の表示装置として、液晶表示装置が用いられている。また、車両用計器にも車両情報や交通情報を表示する表示装置として液晶表示装置が用いられるようになってきている。これらの液晶表示装置は液晶パネルを照射する照明装置を備えており、この照明装置としては光源と、この光源の光束を液晶パネルの照射に最適な面状の光束に変換する導光板とよりなるものであった。
特開２００６−１１８８９２号公報 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

しかしながら、近年、車両用計器、特に、指針を用いた車両用計器においては、表示装置の表示領域が大型化している。これに伴い、この大型化した表示装置を前記指針の回転中心部に配置するために、表示領域及び外形が略円形状である液晶パネルが開発され、それに伴い照明装置の発光領域および外形も略円形状であることが求められるようになってきている。この表示装置の大型化に伴い、表示領域の照明ムラも目につきやすくなるという問題点もあった。   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.

そこで、本発明は、この要望に鑑みなされたものであり、照明ムラを抑えた照明装置を提供するものである。   Therefore, the present invention has been made in view of this demand, and provides an illumination device that suppresses uneven illumination.

本発明は、光源と、導光部材と、を備え、前記光源から発せられる光が前記導光部材の光入射部から入射するとともに前記導光部材の光出射部から出射して被照明部材を照明する照明装置において、前記導光部材を略円形状とし、前記光源を複数備え、前記複数の光源から出た光の出射方向が全て交わるように前記光源を前記導光部材の周縁に配設したものである。   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.

また、本発明は、前記複数の光源の個数で前記導光部材の周縁を等分割し、前記各等分割した周辺内に前記各光源を配置したものである。   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.

また、本発明は、前記光源間の角度を３６０/ｎ（単位は度、ｎは、光源の数で、ｎ≧３かつ奇数）の式により求められる間隔としたものである。   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).

また、本発明は、前記光入射部を前記導光部材の側面に設けたものである。   Moreover, this invention provides the said light-incidence part in the side surface of the said light guide member.

また、本発明は、前記光入射部が、平面状に形成されてなることものである。   In the present invention, the light incident portion is formed in a planar shape.

また、本発明は、前記光出射部の下面側に、微細な凹凸からなる光反射部を設けたものである。   In the present invention, a light reflecting portion having fine irregularities is provided on the lower surface side of the light emitting portion.

本発明によれば、所期の目的を達成でき、照明ムラを抑えた照明装置を提供することができる。   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.

以下に、本発明の実施形態を添付図面に基づいて説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

本実施形態による照明装置１は、光源２と、導光部材３と、基板４と、上ケース１０と、下ケース１２と、反射シート１４と、プリズムシート１６と、拡散シート１８とで、主に構成されている。   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.

光源２は、例えば、発光ダイオードである。光源２は、複数設けられており、本実施形態では、７つ設けられている。光源２は、導光部材３の周縁に、そして、導光部材３の側面に対して、正対するように配置されている。   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.

導光部材３は、光を透過可能な合成樹脂からなり、上面と下面とが平行な平板で、正面視において、円形状である（図３参照）。光源２から発せられる光は、導光部材３の側面の光入射部３ａから入射し、導光部材３の上面の光出射部３ｂから出射する。この出射光によって、図示しない被照明部材、例えば、液晶表示パネルなどの表示素子を照明する。なお、本実施形態では、導光部材３は正面視において、円形状であるが、本発明にあっては略円形状であればよく、例えば、光入射部３ａの、光源２に対向した部分が平面であってもよい。   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.

導光部材３の光出射部３ｂの下面には、光反射部３ｃが設けられている。光反射部３ｃは、導光部材３の光入射部３ａから入射した光を、導光部材３の光出射面３ｂに反射させるものである。この光反射部３ｃは、微細な凹凸からなり、本実施形態では、光源２の光の出射方向に対して、光源２から離れるほど凹凸の個数が多くなっている。また、光源２の近傍では、光源２から出た光が強いので、所定の範囲で、光反射部３ｃである凹凸の個数が少ない領域を備えている（図３参照）。   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).

基板４は、光源２と電気的に接続されており、図示しない電源からの電力を、基板４を通じて光源２へ供給する。基板４のベース材は、アルミニウムなどの硬質の材料からなり、図示しない絶縁層や配線パターンが施されてある。また、基板４の上面（導光部材３側の面）には、反射層４ａが施されており、この反射層４ａは、白色のシルク若しくはレジスト４ａなどで形成されている。これは、導光部材３から漏れ出た光を再び導光部材３に反射するものである。基板４のベース材に、金属を用いることで光源２で発生した熱を拡散させる効果が期待できる。   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.

導光部材３と基板４との間には、反射シート１４が設けられている。この反射シート１４は、合成樹脂からなる薄い板状であり、導光部材３の下面から漏れる光を良好に反射し、照明効率を上昇させる効果がある。   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.

導光部材３の光出射面３ｂには、各々２枚のプリズムシート１６と拡散シート１８とが積層した状態で設けられている。１枚の拡散シート１８が導光部材３上に配置され、次いで、２枚のプリズムシート１６が１枚目の拡散シート１８上に配置され、最後に、プリズムシート１６上に２枚目の拡散シート１８が配置される。   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.

プリズムシート１６は、合成樹脂からなる薄い板状であり、プリズム効果を有する複数の平行な溝を備えている。そして、２枚のプリズムシート１６は、前記複数の溝が互いに略直交するように配置されており、導光体３からの光を、図示しない被照明部材へ良好に照射させる効果がある。   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.

拡散シート１８は、合成樹脂からなる薄い板状であり、光出射面３ｂからの光を拡散させ、主に照明ムラを緩和する効果がある。   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.

上ケース１０および下ケース１２は、白色の合成樹脂からなり、図示しない手段によって固定され、導光部材３、基板４、反射シート１４、プリズムシート１６および拡散シート１８を固定している。なお、１９は、スペーサであり、白色の合成樹脂からなり、導光部材３と上ケース１０との間で、かつ光源２間に形成された空間を満たすものであり、本実施形態では、スペーサ１９は、全て連結されている。このスペーサ１９は、導光部材３の側面から漏れる光を良好に反射し、照明効率を上昇させる効果がある。   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.

複数の光源２から出た光の出射方向Ｌが全て交わるように光源２を導光部材３の周縁に配設してある。   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.

そして、複数の光源２が配置される間隔は、等間隔であり、この光源２間の角度は、３６０／ｎ（単位は度、ｎは、光源の数で、ｎ≧３かつ奇数）の式により求められるものである。本実施形態では、７つの光源２が配置されているので、光源２間の角度は、３６０／７で、約５１．４３度となる。   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.

本発明では、複数の光源２から出た光の出射方向Ｌが、全て交わるように光源２を導光部材３の周縁に設けたことによって、照明ムラを抑えた照明装置１を提供することができる。また、光源２から出た光の出射方向Ｌの全てが、交わると言うことは、任意の光源２が正対しないので、一方の光源２が、他方の光源２に向けて光を照射することによって、光が集中することによって生じる照明ムラを抑制することができる。   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.

また、本発明では、光源２を等間隔に配置し、また、光源２の数を奇数としたことによって、導光部材３の光源２を設けた側とは反対の側には、光源２が配置されない。よって、導光部材３の光源２を設けた側とは反対の側には、光反射部３ｃが多く設けられており、光出射面３ｂへ光を良好に反射することができ、前記被照明部材を照明する輝度を向上させることができ、照明ムラを抑えた照明装置１を提供することができる。なお、本発明は、光源２に指向性の強い光源を用いる場合に、特に有効である。   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.

また、導光部材３の側面に光入射部３ａを設けたことによって、光源２から出た光が導光部材３の板面方向に平行に、導光部材３内に入ることができるので、光源２の光を効率よく導光部材３に取り入れることができる。   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.

図４は、本発明の第２実施形態を示すもので、特に、光源２の配置に関するものである。   FIG. 4 shows a second embodiment of the present invention, and particularly relates to the arrangement of the light source 2.

本実施形態では、光源５が、導光部材６の背後に設け、導光部材６の光入射部６ａを導光部材６の背面で、かつ周縁に設け、そして、この光入射部６ａから入射した光を導光部材６の中心方向に反射する光反射面６ｄを導光部材６の周辺に設けたものである。この反射部６ｄは、光入射部６ａの面に対して、４５度の角度である。導光部材６に入った光は、光出射部６ｂから出射される。   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.

なお、前記各実施形態では、光源２を等間隔に配置していたが、本実施形態に限定されるものではなく、製品の形状などの諸条件によって、光源２を等間隔に配置することができない場合は、複数設けた光源２の個数で導光部材３の周縁を等分割し、この各等分割した周縁内に各光源２を配置すればよい。この場合、等分割した周縁に光源２を配置することで、照明ムラを抑えることができる。なお、この場合、光源２の個数は、奇数に限定されるものではなく、偶数でもよい。   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.

本発明の第１実施形態の正面図。The front view of 1st Embodiment of this invention. 図１中Ａ−Ａ線の断面図。Sectional drawing of the AA line in FIG. 図２中Ｂ−Ｂ線の断面図。Sectional drawing of the BB line in FIG. 本発明の第２実施形態の断面図。Sectional drawing of 2nd Embodiment of this invention.

符号の説明Explanation of symbols

１ 照明装置
２、５ 光源
３、６ 導光部材
３ａ、６ａ 光入射部
３ｂ、６ｂ 光出射部
３ｃ 光反射部
４ 基板
４ａ 反射層
６ｄ 光反射面
１０ 上ケース
１２ 下ケース
１４ 反射シート
１６ プリズムシート
１８ 拡散シート
１９ スペーサ 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)

光源と、導光部材と、を備え、前記光源から発せられる光が前記導光部材の光入射部から入射するとともに前記導光部材の光出射部から出射して被照明部材を照明する照明装置において、前記導光部材を略円形状とし、前記光源を複数備え、前記複数の光源から出た光の出射方向が全て交わるように前記光源を前記導光部材の周縁に配設したことを特徴とする照明装置。 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. 前記複数の光源の個数で前記導光部材の周縁を等分割し、前記各等分割した周辺内に前記各光源を配置したことを特徴とする請求項１に記載の照明装置。 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. 前記光源間の角度を３６０/ｎ（単位は度、ｎは、光源の数で、ｎ≧３かつ奇数）の式により求められる間隔としたことを特徴とする請求項１に記載の照明装置。 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). 前記光入射部を前記導光部材の側面に設けたことを特徴とする請求項１に記載の照明装置。 The lighting device according to claim 1, wherein the light incident portion is provided on a side surface of the light guide member. 前記光入射部が、平面状に形成されてなることを特徴とする請求項１に記載の照明装置。 The lighting device according to claim 1, wherein the light incident portion is formed in a planar shape. 前記光出射部の下面側に、微細な凹凸からなる光反射部を設けたことを特徴とする請求項１に記載の照明装置。 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.
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