JPH0843633A - Linear illuminating device - Google Patents
Linear illuminating deviceInfo
- Publication number
- JPH0843633A JPH0843633A JP6180009A JP18000994A JPH0843633A JP H0843633 A JPH0843633 A JP H0843633A JP 6180009 A JP6180009 A JP 6180009A JP 18000994 A JP18000994 A JP 18000994A JP H0843633 A JPH0843633 A JP H0843633A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light guide
- lighting device
- guide body
- linear
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば光学的画像読み
取り装置において原稿面を主走査方向に細幅の線状に照
明する場合の照明手段として適切な線状照明装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear illuminating device which is suitable as an illuminating means for illuminating a document surface in the form of a narrow line in the main scanning direction in an optical image reading device.
【０００２】[0002]
【従来の技術】便宜上、光学的画像読み取り装置を例に
して説明する。2. Description of the Related Art For convenience, an optical image reading apparatus will be described as an example.
【０００３】近年、光学的画像読み取り装置は小型ファ
クシミリやバーコードリーダー等の読み取り装置として
広く使用されており、この種の装置の原稿照明系にはＬ
ＥＤチップを一列状に並べたＬＥＤアレイが使用されて
いる。In recent years, an optical image reading device has been widely used as a reading device for small facsimiles, bar code readers, and the like, and an L type is used in a document illumination system of this type of device.
An LED array in which ED chips are arranged in a line is used.
【０００４】以下図面を参照しながら、上記した従来の
光学的画像読み取り装置に使用されている線状照明装置
の一例について説明する。An example of the linear illumination device used in the above-mentioned conventional optical image reading device will be described below with reference to the drawings.
【０００５】図１４は従来の光学的画像読み取り装置の
構成図を示すものである。図１４において、１４１は原
稿である。１４２は原稿を照明する線状照明装置として
のＬＥＤアレイである。１４３は原稿で反射した光を集
光するロッドレンズアレイである。１４４は１４３で集
光された光を取り込んで電気信号に変換する光電変換素
子アレイである。又、ＬＥＤアレイ１４２は例えば図１
５に示すように、回路導体層を施した基板１５１上にＬ
ＥＤチップ１５２を複数個、直線状に実装して構成す
る。FIG. 14 shows a block diagram of a conventional optical image reading apparatus. In FIG. 14, 141 is a document. Reference numeral 142 is an LED array as a linear illumination device that illuminates the document. Reference numeral 143 is a rod lens array that collects the light reflected by the document. 144 is a photoelectric conversion element array that takes in the light condensed by 143 and converts it into an electric signal. The LED array 142 is, for example, as shown in FIG.
As shown in FIG. 5, L is formed on the substrate 151 having the circuit conductor layer.
A plurality of ED chips 152 are linearly mounted and configured.
【０００６】以上のように構成された光学的画像読み取
り装置及び線状照明装置について、以下その動作につい
て説明する。The operation of the optical image reading device and the linear illumination device configured as described above will be described below.
【０００７】まずＬＥＤアレイ１４２からの光を読み取
るべき原稿１４１に照射し、その反射光をロッドレンズ
アレイ１４３で集光し、光電変換素子アレイ１４４に導
き、電気信号に変換していた。First, the original 141 to be read is irradiated with the light from the LED array 142, the reflected light is condensed by the rod lens array 143, guided to the photoelectric conversion element array 144, and converted into an electric signal.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら上記のよ
うな構成では、ＬＥＤアレイ１４２は、図１４における
ＬＥＤチップ１５２の個々の発光量ばらつきや指向特性
の影響により、被照明原稿面１４１での照明ムラを生じ
ることとなり、この照明系を上記の光学的画像読み取り
装置に用いると、光電変換素子アレイ１４４で受光し、
変換された電気信号は均一性（ＰＲＮＵ）の悪い信号と
なり、信号補正処理（例えばシェーディング補正）を設
けたとしてもコストアップや信号補正処理能力等に負担
が生じる。又、信号補正処理を設けなければ、例えば一
様な灰色の原稿を読み取ると照明の明るい部分は白く、
照明の暗い部分は黒く表示するおそれがある。又、Ｓ／
Ｎを上げるためにＬＥＤアレイ１４２を原稿面１４１に
近付けるとＬＥＤチップ１５２の個々の指向特性の影響
がさらに大きくなり、光学的画像読み取り装置の電気信
号のＰＲＮＵが益々悪化することになる。However, in the above-mentioned configuration, the LED array 142 has the illumination unevenness on the illuminated original surface 141 due to variations in the individual light emission amounts of the LED chips 152 in FIG. When this illumination system is used in the above optical image reading device, the photoelectric conversion element array 144 receives light,
The converted electric signal becomes a signal with poor uniformity (PRNU), and even if signal correction processing (for example, shading correction) is provided, the cost is increased and the signal correction processing capability is burdened. Also, if no signal correction processing is provided, for example, when a uniform gray original is read, the bright part of the illumination is white,
The dark part of the lighting may be displayed black. Also, S /
If the LED array 142 is brought closer to the document surface 141 in order to increase N, the influence of the individual directional characteristics of the LED chips 152 becomes even greater, and the PRNU of the electrical signal of the optical image reading apparatus becomes worse.
【０００９】本発明は上記問題点に鑑み、原稿面照度が
充分にとれ、しかも原稿面に近付けても照明ムラは生じ
ず、さらにＬＥＤチップの個数を削減することで低コス
ト化が実現できる線状照明装置を提供するものである。In view of the above-mentioned problems, the present invention provides a line in which the illuminance on the original surface is sufficiently high, the uneven illumination does not occur even when the original surface is approached, and the cost can be reduced by reducing the number of LED chips. A lighting device is provided.
【００１０】[0010]
【課題を解決するための手段】上記問題点を解決するた
めに本発明の線状照明装置は、透光性材料から成る導光
体を柱状あるいは錐台状の形状とし、前記導光体の底面
部には発光体を備えた構成とする。又、前記導光体の少
なくとも一側表面に光拡散部を形成するか、あるいはＶ
型切削や溝を施し、さらに前記Ｖ型切削面や溝面を粗
面、あるいは三角波面に処理して光拡散部としたり、
又、光拡散部上に光拡散層を形成する構成とするもので
ある。In order to solve the above-mentioned problems, the linear lighting device of the present invention has a columnar or frustum-shaped light guide made of a translucent material, The bottom portion has a light-emitting body. In addition, a light diffusing portion is formed on at least one surface of the light guide, or
Die cutting or grooving, and further processing the V-shaped cutting surface or groove surface into a rough surface or a triangular wave surface to form a light diffusing portion,
Further, the light diffusing layer is formed on the light diffusing portion.
【００１１】[0011]
【作用】本発明は上記した構成によって、発光体から導
光体内部に入射した光は、スネルの法則に従って前記導
光体内部を進行するが、途中で光拡散部に到達した光は
前記光拡散部で反射、拡散され、前記導光体の少なくと
も一側表面から外部に出射することとなる。According to the present invention, according to the above-described structure, the light incident from the light emitting body into the light guide body travels inside the light guide body according to Snell's law, while the light reaching the light diffusing portion on the way is the light The light is reflected and diffused by the diffusing portion and is emitted to the outside from at least one surface of the light guide.
【００１２】[0012]
【実施例】以下本発明の第一の実施例の線状照明装置に
ついて、図面を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A linear illumination device according to a first embodiment of the present invention will be described below with reference to the drawings.
【００１３】図１〜図６は本発明の実施例における柱状
形状の線状照明装置の構成を示すものである。図１にお
いて、１は導光体、２は光拡散部、３は発光体である。
４は導光体の底面部である。５は光出射面である。図２
は発光体３の発光角度分布（指向特性）である。図３は
導光体内部に入射した光の振舞いを２次元で示した一例
である。図３において、３１は臨界角以内の光線であ
る。３２は臨界角を越えた光線である。３３は拡散光で
ある。３４は照明光である。図４は、導光体表面に形成
する光拡散部の形態を示すものである。図５は、導光体
表面の光拡散部の状態の一例である。図６は、導光体断
面の形状である。ここで図１〜図６の同様の箇所には同
一番号を記している。1 to 6 show the configuration of a columnar linear illumination device according to an embodiment of the present invention. In FIG. 1, 1 is a light guide, 2 is a light diffusion part, and 3 is a light emitter.
Reference numeral 4 is a bottom surface portion of the light guide. 5 is a light emitting surface. Figure 2
Is a light emitting angle distribution (directivity characteristic) of the light emitting body 3. FIG. 3 is an example in which the behavior of light incident inside the light guide is shown two-dimensionally. In FIG. 3, 31 is a ray within the critical angle. Reference numeral 32 is a ray exceeding the critical angle. 33 is diffused light. 34 is illumination light. FIG. 4 shows the form of the light diffusion portion formed on the surface of the light guide. FIG. 5 is an example of a state of the light diffusion portion on the surface of the light guide. FIG. 6 shows the shape of the light guide cross section. Here, the same numbers are given to the same portions in FIGS. 1 to 6.
【００１４】以上のように構成された線状照明装置につ
いて、以下、図１〜図６を用いてその動作を説明する。
なお、ここでは便宜上、柱状形状の例として円柱形状を
取り上げる。The operation of the linear lighting device having the above-described structure will be described below with reference to FIGS.
For the sake of convenience, a columnar shape will be taken as an example of the columnar shape.
【００１５】まず、光線透過率が８０％以上で屈折率が
１．４〜１．７である、例えばアクリル樹脂、ポリカー
ボネート樹脂、ポリスチレン樹脂、塩化ビニ−ル樹脂、
あるいはガラスのような透光性材料を用いて成形した導
光体１の側面の表面に光拡散部２を形成する。但し、導
光体１の光拡散部２以外の全表面は滑面である必要があ
り、インジェクション成形法や押しだし法で成形し、必
要があればその後、研磨等の処理を行う。又この時、光
拡散部２は導光体１の側面の表面に成形した溝としても
よい。次に、導光体１の底面４に例えば、図２に示した
ような発光角度分布（指向特性）が３０度〜１５０度で
ある発光体３（例えば発光ダイオード）を密着させ、発
光体３を点灯させると、発光体３が放出した光は、底面
４から導光体１の内部に入射し、図３に示すようなスネ
ルの法則に従った振舞いをする。（スネルの法則：ｓｉ
ｎ ｉ／ｓｉｎ ｒ＝ｎr／ｎiの式で表され、本実施例の
場合、ｉは導光体内部から空気中に向かう光線３１と導
光体表面の法線との角。ｒは光線３１が空気中に出射し
た時の屈折角。ｎrは空気の屈折率で１。ｎiは導光体の
屈折率で１．４〜１．７。）即ち、臨界角（ｉ0＝ｓｉ
ｎ-1（１／ｎi））以内の光線３１は導光体内部から空
気中に出射するが、臨界角を越えた光線３２は導光体表
面で全反射を繰り返しながら導光体内部を進行する。こ
の時、光線３２の一部が光拡散部２に当たると全反射を
起こさずに拡散され、その拡散光３３は次に到達する導
光体表面に於いて、またスネルの法則に従った振舞いを
し、臨界角以内の光線は空気中に出射し、照明光３４と
して寄与し、臨界角を越えた光線は全反射して次に到達
する導光体表面が光拡散部２か、あるいは光拡散部２以
外の導光体１の表面かによって前述した同様の現象が導
光体１の長さ方向で生じている。又、導光体１の断面方
向についても同様の現象が無数に繰り返されている。
又、ここでは第一の実施例として図１に示すような円柱
形状の導光体１を例としたが、形状は多角柱等の柱状で
あってもよい。又、光拡散部２は、図１では導光体１の
一側面の表面に、一定幅で連続的に形成したが、照明ム
ラのない均一な照明光を出すために導光体１の両端から
中央部にかけて光拡散部２の幅や面積を変化させ、例え
ば図４に示したように発光体３が設置されている導光体
１の底面４から中央部に向かって次第に大きくなるよう
に連続的に形成したり（図４ａ）、導光体の一側表面
に、不連続的に一定ピッチで、かつ一定形状で形成した
り（図４ｂ）、あるいは導光体の一側表面に、不連続的
に一定ピッチで、かつ光拡散層面積が導光体１の底面４
から中央部に向かって次第に大きくなるように形成した
り（図４ｃ）、導光体１の一側表面に、不連続的に一定
形状で、かつ導光体１の底面４から中央部に向かって次
第にピッチが狭くなるように形成（図４ｄ）してもよ
い。さらに導光体１の表面は、導光体１の一側表面に設
けた光拡散部２と、光出射面５と、発光体３を備えた底
面４以外は完全光反射層４１を形成する（図４ｅ）方法
もある。ここで完全反射層４１はパラジウム、鉄、クロ
ム、アルミニウム、銀、ニッケル等の金属やこれら合金
の金属薄膜、あるいはこれらの合金片や粒子を含むイン
キ等を蒸着法、スパッタ法、転写法、メッキ法、塗装
法、印刷法によって形成する。又、導光体１の表面の光
拡散部２の表面状態は、ＪＩＳ規格Ｂ０６０１に示され
ている表面の粗さで中心線平均粗さＲaが（１００〜
０．０１３）ａ、最大高さＲmaxが（４００〜０．０
５）Ｓの粗面や、図５に示すようなピッチ５０μｍ〜２
０００μｍで山の高さ２０μｍ〜８００μｍの三角波面
（あるいはのこぎり波面）とするとよい。又、本実施例
に示したように導光体１が円柱状であれば、導光体１の
断面形状は図６に示すように 導光体１の光出射面５
に、二面の平面部を形成し、その二平面による挟角が９
０度である形状としてもよい。First, a light transmittance of 80% or more and a refractive index of 1.4 to 1.7, such as acrylic resin, polycarbonate resin, polystyrene resin, vinyl chloride resin,
Alternatively, the light diffusion portion 2 is formed on the surface of the side surface of the light guide body 1 formed by using a translucent material such as glass. However, the entire surface of the light guide 1 except the light diffusing portion 2 needs to be a smooth surface, and is formed by an injection molding method or an extrusion method, and if necessary, a treatment such as polishing is performed thereafter. At this time, the light diffusion portion 2 may be a groove formed on the surface of the side surface of the light guide 1. Next, for example, a light emitting body 3 (for example, a light emitting diode) having a light emitting angle distribution (directional characteristic) of 30 degrees to 150 degrees as shown in FIG. When is turned on, the light emitted from the light emitting body 3 enters the inside of the light guide body 1 from the bottom surface 4 and behaves according to Snell's law as shown in FIG. (Snell's law: si
It is represented by the formula ni / sin r = n r / n i , and in the case of the present embodiment, i is the angle between the light ray 31 traveling from the inside of the light guide body to the air and the normal to the light guide body surface. r is the refraction angle when the light ray 31 is emitted into the air. n r is the refractive index of air, which is 1. n i is the refractive index of the light guide, which is 1.4 to 1.7. ) That is, the critical angle (i 0 = si
A light ray 31 within n −1 (1 / n i ) is emitted from the inside of the light guide body into the air, but a light ray 32 exceeding the critical angle passes through the inside of the light guide body while repeating total reflection on the light guide body surface. proceed. At this time, when a part of the light ray 32 hits the light diffusing section 2, it is diffused without causing total reflection, and the diffused light 33 behaves on the surface of the light guide body which arrives next and according to Snell's law. However, the light ray within the critical angle is emitted into the air and contributes as the illumination light 34, and the light ray exceeding the critical angle is totally reflected and reaches the light guide surface which is the light diffusing portion 2 or the light diffusing portion. The same phenomenon as described above occurs in the length direction of the light guide 1 depending on whether the surface of the light guide 1 is other than the portion 2. The same phenomenon is repeated innumerably in the cross-sectional direction of the light guide 1.
Although the cylindrical light guide 1 as shown in FIG. 1 is taken as an example in the first embodiment, the shape may be a pillar such as a polygonal pillar. Further, the light diffusing portion 2 is continuously formed with a constant width on the surface of one side surface of the light guide 1 in FIG. 1, but both ends of the light guide 1 are provided in order to emit uniform illumination light without uneven illumination. From the bottom to the center, the width and area of the light diffusing section 2 are changed so that, for example, as shown in FIG. 4, the width gradually increases from the bottom surface 4 of the light guide 1 on which the light emitting body 3 is installed to the center. It may be formed continuously (FIG. 4a), on one surface of the light guide discontinuously at a constant pitch and in a constant shape (FIG. 4b), or on one surface of the light guide. The light diffusion layer has a discontinuously constant pitch and the area of the light diffusion layer is the bottom surface 4 of the light guide 1.
From the bottom surface 4 of the light guide 1 to the center of the light guide 1 on one side surface thereof. The pitch may be gradually narrowed (FIG. 4d). Further, on the surface of the light guide body 1, a complete light reflection layer 41 is formed except for the light diffusion portion 2 provided on one surface of the light guide body 1, the light emitting surface 5, and the bottom surface 4 provided with the light emitting body 3. (Fig. 4e) There is also a method. Here, the perfect reflection layer 41 is a metal thin film of a metal such as palladium, iron, chromium, aluminum, silver, nickel or the like, or a metal thin film of these alloys, or an ink containing such alloy pieces or particles, a vapor deposition method, a sputtering method, a transfer method, a plating method. It is formed by a printing method, a painting method, or a printing method. Further, the surface state of the light diffusing portion 2 on the surface of the light guide body 1 is the surface roughness shown in JIS B0601, and the center line average roughness Ra is (100 to
0.013) a and the maximum height R max is (400 to 0.0
5) S rough surface or pitch 50 μm to 2 as shown in FIG.
A triangular wavefront (or a sawtooth wavefront) having a peak height of 000 μm and a peak height of 20 μm to 800 μm is preferably used. Further, if the light guide 1 is cylindrical as shown in this embodiment, the cross-sectional shape of the light guide 1 is as shown in FIG.
, A two-sided flat surface is formed, and the included angle between the two flat surfaces is 9
The shape may be 0 degree.
【００１６】以上のように本実施例によれば、透光性材
料を用いて成形した導光体と、その導光体の側面の表面
に光拡散部を設け、導光体の両底面に発光体を密着し発
光させることにより、導光体の内部表面で全反射し導光
体内部を進行する光線と、光拡散部に当り拡散され空気
中に出射する光線が常に無数に存在し、導光体から照明
ムラのない光が発せられることとなる。As described above, according to the present embodiment, a light guide formed by using a translucent material, and a light diffusing portion provided on the side surface of the light guide, and on both bottom surfaces of the light guide. By causing the light emitter to adhere and emit light, there are always countless light rays that are totally reflected on the inner surface of the light guide body and travel inside the light guide body, and light rays that hit the light diffusing portion and are emitted into the air. Light without uneven illumination is emitted from the light guide.
【００１７】以下本発明の第二の実施例について図面を
参照しながら説明する。図７は本発明の第二の実施例を
示す線状照明装置の導光体の斜視図である。同図におい
て、７１は光拡散層である。他は図１の構成と同様で同
一箇所には同一番号を記してある。A second embodiment of the present invention will be described below with reference to the drawings. FIG. 7 is a perspective view of a light guide of a linear lighting device showing a second embodiment of the present invention. In the figure, 71 is a light diffusion layer. Others are the same as in the configuration of FIG. 1, and the same parts are denoted by the same reference numerals.
【００１８】図１と異なるのは、光拡散層７１を光拡散
部２の代わりに形成したことである。ここで、光拡散層
７１は導光体１の屈折率よりも大きい屈折率をもつ光拡
散体（例えば酸化チタン、酸化亜鉛、酸化マグネシウ
ム、あるいは炭酸カルシウム、シリカ等）と、導光体１
の屈折率とほぼ等しい屈折率をもつ透光性樹脂（例えば
シリコン樹脂）を、印刷法やロ−ルコ−タ−等のコ−テ
ィング法、塗装法によって導光体１の一側表面に作製す
る。又、光拡散層７１は図４で示した光拡散部２とと同
様に形成することができ、又、光拡散層７１は図４で示
した光拡散部２の上の全面あるいは一部に形成してもよ
い。その場合、導光体１の光拡散層７１を形成した一側
表面（光拡散層７１と導光体１の境界）の状態が滑面で
ある場合と比較して、光拡散層７１、あるいは光拡散部
２に当たった光はさらに効率よく拡散され、線状照明装
置としての照明効率を２０％以上よくすることができ
る。The difference from FIG. 1 is that a light diffusion layer 71 is formed instead of the light diffusion portion 2. Here, the light diffusion layer 71 includes a light diffuser having a refractive index higher than that of the light guide body 1 (for example, titanium oxide, zinc oxide, magnesium oxide, calcium carbonate, silica, or the like), and the light guide body 1
A translucent resin (for example, a silicone resin) having a refractive index substantially equal to the refractive index of the above is prepared on one surface of the light guide 1 by a printing method, a coating method such as a roll coater, or a coating method. To do. The light diffusing layer 71 can be formed in the same manner as the light diffusing portion 2 shown in FIG. 4, and the light diffusing layer 71 can be formed on the entire surface or a part of the light diffusing portion 2 shown in FIG. You may form. In that case, as compared with the case where the state of the one side surface (the boundary between the light diffusion layer 71 and the light guide 1) on which the light diffusion layer 71 of the light guide 1 is formed is a smooth surface, The light hitting the light diffusing unit 2 is diffused more efficiently, and the illumination efficiency of the linear lighting device can be improved by 20% or more.
【００１９】以下本発明の第三の実施例について図面を
参照しながら説明する。図８は本発明の第三の実施例を
示す線状照明装置の導光体の斜視図である。同図におい
て、８１はＶ型切削面である。他は図１の構成と同様で
同一箇所には同一番号を記してある。なお、発光体３
は、図１と同様導光体１の底面４に密着させるが図８に
於いては省略してある。A third embodiment of the present invention will be described below with reference to the drawings. FIG. 8 is a perspective view of a light guide of a linear lighting device showing a third embodiment of the present invention. In the figure, 81 is a V-shaped cutting surface. Others are the same as in the configuration of FIG. 1, and the same parts are denoted by the same reference numerals. In addition, the luminous body 3
Is closely attached to the bottom surface 4 of the light guide 1 as in FIG. 1, but is omitted in FIG.
【００２０】図１及び図２と異なるのは導光体１の側面
に、導光体１の底面４から中央部に向かって次第に大き
くなるように斜めに、かつ平面でＶ型に切削したＶ型切
削面８１を設け、導光体１の中央部において切削面が最
大幅を持つようにした点である。1 and 2 is different from that shown in FIGS. 1 and 2 in that the side surface of the light guide 1 is cut into a V shape obliquely and in a plane so as to gradually increase from the bottom surface 4 of the light guide 1 toward the central portion. The mold cutting surface 81 is provided so that the cutting surface has the maximum width in the central portion of the light guide 1.
【００２１】以上のように構成された線状照明装置の導
光体について、以下その動作を説明する。The operation of the light guide of the linear lighting device constructed as described above will be described below.
【００２２】まず、導光体１の底面４に発光体３を密着
させ発光体３を点灯すると、導光体１内部に入射した光
は第一の実施例で説明した線状照明装置と同様な振舞い
をし照明光３４となる。しかし、第一の実施例及び第二
の実施例では、発光体３から導光体１内部に入射した光
は、導光体１の底面４（ａ）（あるいは４（ｂ））から
一方の底面４（ｂ）（あるいは４（ａ））に抜けて行く
光が多く、発光体３から出た光の一部だけが照明光３４
となり、発光体３から出た光が有効活用されず結局、照
明光の光量不足という課題があった。そこで第三の実施
例では第一の実施例及び第二の実施例の課題を解決する
ために、導光体１の側面にＶ型切削面８１を成形し、Ｖ
型切削面８１の全面あるいは一部を光拡散部２とするこ
とで、底面４（ａ）（あるいは４（ｂ））から底面４
（ｂ）（あるいは４（ａ））に向かう光をＶ型切削面８
１（あるいはＶ型切削面８１上にある光拡散部２）に当
て、照明効率をよくするものである。又、第三の実施例
の導光体１の側面に形成する光拡散部２は、図８では導
光体１の一側面に成形したＶ型切削面８１の全面に、連
続的に形成したが、照明ムラのない均一な照明光を出す
ために導光体１の両端から中央部にかけてＶ型切削面８
１上の光拡散部２の幅や面積を変化させ、例えば、図９
に示したようにＶ型切削面８１上で、不連続的に一定ピ
ッチで、かつ一定幅状で形成したり（図９ａ）、あるい
はＶ型切削面８１上に、不連続的に一定ピッチで、かつ
光拡散部面積が導光体１の底面４から中央部に向かって
次第に大きくなるように形成したり（図９ｂ）、Ｖ型切
削面８１上に、不連続的に一定幅状で、かつ導光体１の
底面４から中央部に向かって次第にピッチが狭くなるよ
うに形成（図９ｃ）してもよい。さらに導光体１の表面
は、光拡散部２と、光出射面５と、発光体３を備えた底
面４以外は完全光反射層９１を形成してもよい（図９
ｄ）。又、図９に示した光拡散部２は光拡散層７１に置
き換えることも可能であるし、さらにＶ型切削面８１の
全面を光拡散部２として、その上の全面あるいは一部に
光拡散層７１を形成したり、あるいはＶ型切削面８１の
一部を光拡散部２として、その光拡散部２の上の全面あ
るいは一部に光拡散層７１を形成してもよい。又、完全
光反射層は、パラジウム、鉄、クロム、アルミニウム、
銀、ニッケル等の金属やこれら合金の金属薄膜、あるい
はこれらの合金片や粒子を含むインキ等を蒸着法、スパ
ッタ法、転写法、メッキ法、塗装法、印刷法によって形
成する。さらに上記したＶ型切削面８１上の光拡散部２
の表面状態は、ＪＩＳ規格Ｂ０６０１に示されている表
面の粗さで中心線平均粗さＲaが（１００〜０．０１
３）ａ、最大高さＲmaxが（４００〜０．０５）Ｓの粗
面や、図５に示すようなピッチ５０μｍ〜２０００μｍ
で山の高さ２０μｍ〜８００μｍの三角波面（あるいは
のこぎり波面）とするとよい。First, when the light emitter 3 is brought into close contact with the bottom surface 4 of the light guide 1 and the light emitter 3 is turned on, the light entering the light guide 1 is the same as that of the linear illumination device described in the first embodiment. It behaves as the illumination light 34. However, in the first and second embodiments, the light that has entered the inside of the light guide 1 from the light emitting body 3 is emitted from the bottom surface 4 (a) (or 4 (b)) of the light guide 1 to one side. A lot of light goes out to the bottom surface 4 (b) (or 4 (a)), and only a part of the light emitted from the light emitting body 3 is the illumination light 34.
Therefore, the light emitted from the light-emitting body 3 is not effectively used, and there is a problem that the amount of illumination light is insufficient. Therefore, in the third embodiment, in order to solve the problems of the first and second embodiments, a V-shaped cutting surface 81 is formed on the side surface of the light guide body 1,
By making the whole or part of the die cutting surface 81 the light diffusing portion 2, the bottom surface 4 (a) (or 4 (b)) can be changed to the bottom surface 4
Light directed to (b) (or 4 (a)) is directed to the V-shaped cutting surface 8
1 (or the light diffusion portion 2 on the V-shaped cutting surface 81) to improve the illumination efficiency. The light diffusing portion 2 formed on the side surface of the light guide body 1 of the third embodiment is continuously formed on the entire V-shaped cutting surface 81 formed on one side surface of the light guide body 1 in FIG. However, in order to emit uniform illumination light without uneven illumination, the V-shaped cutting surface 8 extends from both ends to the central portion of the light guide 1.
By changing the width and area of the light diffusion portion 2 on 1,
As shown in FIG. 9, it may be formed on the V-shaped cutting surface 81 discontinuously at a constant pitch and with a constant width (FIG. 9a), or on the V-shaped cutting surface 81 discontinuously at a constant pitch. In addition, the light diffusing portion area is formed so as to gradually increase from the bottom surface 4 of the light guide 1 toward the central portion (FIG. 9b), or is formed on the V-shaped cutting surface 81 in a discontinuous and constant width shape. Further, the pitch may be gradually narrowed from the bottom surface 4 of the light guide 1 toward the central portion (FIG. 9c). Further, on the surface of the light guide body 1, a complete light reflection layer 91 may be formed except for the light diffusion portion 2, the light emitting surface 5, and the bottom surface 4 provided with the light emitting body 3 (FIG. 9).
d). Further, the light diffusing portion 2 shown in FIG. 9 can be replaced with the light diffusing layer 71. Further, the entire V-shaped cutting surface 81 is used as the light diffusing portion 2, and the light diffusing portion 2 is entirely or partially light-diffused. The layer 71 may be formed, or a part of the V-shaped cutting surface 81 may be used as the light diffusion portion 2, and the light diffusion layer 71 may be formed on the entire surface or a portion of the light diffusion portion 2. Further, the complete light reflecting layer is made of palladium, iron, chrome, aluminum,
A metal such as silver or nickel, a metal thin film of these alloys, an ink containing these alloy pieces or particles, or the like is formed by a vapor deposition method, a sputtering method, a transfer method, a plating method, a coating method, or a printing method. Further, the light diffusion portion 2 on the V-shaped cutting surface 81 described above.
The surface state of is the surface roughness shown in JIS B0601, and the center line average roughness Ra is (100 to 0.01).
3) a, a rough surface having a maximum height R max of (400 to 0.05) S, or a pitch of 50 μm to 2000 μm as shown in FIG.
It is advisable to use a triangular wavefront (or a sawtooth wavefront) having a peak height of 20 μm to 800 μm.
【００２３】以上のように導光体の側面の光拡散層形成
面を、導光体の両底面から中央部に向かって次第に大き
くなるように斜めに、かつ平面でＶ型に切削し、導光体
の中央部において切削面が最大幅を持つようなＶ型切削
面を設けることにより、発光体から導光体内部に入射し
た光の一方の底面から他方の底面に抜けて行く量を減ら
し、拡散層に当たる確率を増やすことで照明光の光量を
上げることができる。As described above, the light-diffusing layer forming surface on the side surface of the light guide is obliquely cut into a V-shape in a plane so as to gradually increase from both bottom surfaces of the light guide toward the central portion, and the light guide layer is formed. By providing a V-shaped cutting surface such that the cutting surface has the maximum width in the central part of the light body, the amount of light that has entered the light guide from the light emitter and exiting from one bottom surface to the other bottom surface is reduced. The amount of illumination light can be increased by increasing the probability of hitting the diffusion layer.
【００２４】以下本発明の第四の実施例について図面を
参照しながら説明する。図１０は本発明の第四の実施例
を示す線状照明装置の錐台状導光体の斜視図である。A fourth embodiment of the present invention will be described below with reference to the drawings. FIG. 10 is a perspective view of a frustum-shaped light guide of a linear lighting device showing a fourth embodiment of the present invention.
【００２５】図１１は、導光体表面に形成する光拡散層
の形態を示すものである。図１２は、垂錐台形状の導光
体を示すものである。図１３は、導光体断面の形状であ
る。ここで前図と同様の箇所には同一番号を記してい
る。なお、発光体３は、図１と同様導光体１の底面４に
密着させるが図１０に於いては省略してある。図１及び
図８と異なるのは、導光体１の断面積は、導光体の底面
４から中央部に向かって次第に小面積となり、中央部に
おける導光体１の断面積は底面４の断面積の７０％以下
で最小断面積となるような錐台形状とすることである。FIG. 11 shows the form of the light diffusion layer formed on the surface of the light guide. FIG. 12 shows a truncated cone-shaped light guide. FIG. 13 shows the shape of the light guide cross section. Here, the same numbers are given to the same parts as in the previous figure. The light emitter 3 is closely attached to the bottom surface 4 of the light guide 1 as in FIG. 1, but is omitted in FIG. 1 and 8, the cross-sectional area of the light guide 1 is gradually reduced from the bottom surface 4 of the light guide toward the central portion, and the cross-sectional area of the light guide 1 at the central portion is smaller than that of the bottom surface 4. The frustum shape is such that the minimum cross-sectional area is 70% or less of the cross-sectional area.
【００２６】以上のように構成された線状照明装置の導
光体について、以下その動作を説明する。The operation of the light guide of the linear lighting device constructed as above will be described below.
【００２７】便宜上円錐台状の導光体を例にして説明す
るが、断面形状は導光体の断面積が、導光体の両底面か
ら中央部に向かって、両底面と相似形で次第に小面積に
なり、中央部において最小断面積となるような多角錐台
形状でもよい。For the sake of convenience, the description will be made by taking a truncated cone-shaped light guide as an example, but the cross-sectional shape is such that the cross-sectional area of the light guide gradually changes from both bottom surfaces of the light guide toward the central portion in a similar shape to both bottom surfaces. A polygonal truncated pyramid shape having a small area and a minimum cross-sectional area in the central portion may be used.
【００２８】まず、導光体１の底面４に発光体３を密着
させ発光体３を点灯すると、導光体１内部に入射した光
は第一の実施例で説明した線状照明装置と同様の振舞い
をし、照明光３４となる。しかし、第三の実施例よりも
照明効率をよくし、さらに照明ムラを向上するために
は、第四の実施例では導光体１を錐台形状とすること
で、底面４（ａ）（あるいは４（ｂ））から底面４
（ｂ）（あるいは４（ａ））に向かう光は、中央部に進
むに連れて次第に絞り込まれ、中央部付近の照明光３４
の光量を上げることができ、照明効率がよく、照明ムラ
を無くすことができる。First, when the light emitter 3 is brought into close contact with the bottom surface 4 of the light guide 1 and the light emitter 3 is turned on, the light entering the light guide 1 is the same as that of the linear illumination device described in the first embodiment. And becomes the illumination light 34. However, in order to improve the illumination efficiency and further improve the illumination unevenness as compared with the third embodiment, in the fourth embodiment, the light guide body 1 has a truncated cone shape so that the bottom surface 4 (a) ( Or 4 (b)) to the bottom surface 4
The light traveling toward (b) (or 4 (a)) is gradually narrowed down as it advances to the central portion, and the illumination light 34 near the central portion is emitted.
The amount of light can be increased, the illumination efficiency is good, and uneven illumination can be eliminated.
【００２９】以上のように導光体の断面積が、両底面か
ら中央部に向かって次第に小面積になり、中央部におい
て最小断面積となるような錐台形状で、導光体の側面に
光拡散部２、光拡散層７１を備えることにより、中央部
付近の照明光の光量を上げることができ、照明効率がよ
く、照明ムラを無くすことができる。As described above, the cross-sectional area of the light guide gradually becomes smaller from both bottom surfaces toward the central portion, and is a frustum shape having the minimum cross-sectional area at the central portion. By providing the light diffusing unit 2 and the light diffusing layer 71, it is possible to increase the amount of illumination light in the vicinity of the central portion, improve the illumination efficiency, and eliminate the illumination unevenness.
【００３０】又、第四の実施例の錐台形の導光体１の側
面に形成する光拡散部２は、図１０では導光体１の一側
面の表面に、一定幅で連続的に形成したが、照明ムラの
ない均一な照明光を出すために導光体１の両端から中央
部にかけて光拡散部２の幅や面積を変化させ、例えば、
図１１に示したように発光体３が設置されている導光体
１の底面４から中央部に向かって次第に大きくなるよう
に連続的に形成したり（図１１ａ）、導光体の一側表面
に、不連続的に一定ピッチで、かつ一定形状で形成した
り（図１１ｂ）、あるいは導光体の一側表面に、不連続
的に一定ピッチで、かつ光拡散層面積が導光体１の底面
４から中央部に向かって次第に大きくなるように形成し
たり（図１１ｃ）、導光体１の一側表面に、不連続的に
一定形状で、かつ導光体１の底面４から中央部に向かっ
て次第にピッチが狭くなるように形成（図１１ｄ）して
もよい。さらに導光体１の表面は、導光体１の一側表面
に設けた光拡散部２と、光出射面５と、発光体３を備え
た底面４以外は完全光反射層１１１を形成したり（図１
１ｅ）、導光体１の長さ方向の各点の断面の直径と光拡
散部２の幅との比率が常に一定になるように光拡散部２
を形成してもよい。（図１１ｆ）又、図１０に示した光
拡散部２は光拡散層７１に置き換えることも可能である
し、さらに図１０に示した光拡散部２の上の全面あるい
は一部に光拡散層７１を形成してもよい。又、完全光反
射層は、パラジウム、鉄、クロム、アルミニウム、銀、
ニッケル等の金属やこれら合金の金属薄膜、あるいはこ
れらの合金片や粒子を含むインキ等を蒸着法、スパッタ
法、転写法、メッキ法、塗装法、印刷法によって形成す
る。さらに上記した光拡散部２を形成するために導光体
１の表面に成形した光拡散部２の表面状態を、ＪＩＳ規
格Ｂ０６０１に示されている表面の粗さで中心線平均粗
さＲaは（１００〜０．０１３）ａ、最大高さＲm axは
（４００〜０．０５）Ｓの粗面や、図５に示すようなピ
ッチ５０μｍ〜２０００μｍで山の高さ２０μｍ〜８０
０μｍの三角波面（あるいはのこぎり波面）とすること
が望ましい。Further, the light diffusing portion 2 formed on the side surface of the frustum-shaped light guide 1 of the fourth embodiment is continuously formed with a constant width on the surface of one side of the light guide 1 in FIG. However, in order to emit uniform illumination light without illumination unevenness, the width and area of the light diffusion portion 2 are changed from both ends of the light guide body 1 to the central portion, for example,
As shown in FIG. 11, the light guide 3 is continuously formed such that it gradually increases from the bottom surface 4 on which the light emitter 3 is installed toward the central portion (FIG. 11 a). It may be formed on the surface discontinuously at a constant pitch and in a constant shape (FIG. 11b), or on one surface of the light guide, discontinuously at a constant pitch and with a light diffusion layer area. 1 is formed so as to gradually increase from the bottom surface 4 toward the central portion (FIG. 11c), or is formed on one surface of the light guide 1 in a discontinuous and constant shape from the bottom surface 4 of the light guide 1. The pitch may be gradually narrowed toward the center (FIG. 11d). Further, on the surface of the light guide body 1, a complete light reflection layer 111 is formed except for the light diffusion portion 2 provided on one surface of the light guide body 1, the light emitting surface 5, and the bottom surface 4 provided with the light emitting body 3. Tari (Fig. 1
1e), so that the ratio of the diameter of the cross section of each point in the lengthwise direction of the light guide 1 and the width of the light diffusing portion 2 is always constant.
May be formed. (FIG. 11f) Further, the light diffusing section 2 shown in FIG. 10 can be replaced with the light diffusing layer 71, and the light diffusing layer 2 can be formed on the entire surface or a part of the light diffusing section 2 shown in FIG. 71 may be formed. In addition, the complete light reflection layer is made of palladium, iron, chromium, aluminum, silver,
A metal thin film of nickel or the like or a metal thin film of these alloys, or ink containing these alloy pieces or particles is formed by a vapor deposition method, a sputtering method, a transfer method, a plating method, a coating method, or a printing method. Further, the surface condition of the light diffusing portion 2 formed on the surface of the light guide body 1 to form the above-mentioned light diffusing portion 2 is the center line average roughness R a with the surface roughness shown in JIS standard B0601. the (100 to 0.013) a, the maximum height R m ax is (400 to 0.05) the rough surface of the S or mountain with a pitch 50μm~2000μm as shown in FIG. 5 height 20μm~80
It is desirable to have a triangular wavefront (or a sawtooth wavefront) of 0 μm.
【００３１】又、図１２に示したように導光体１は、長
さ方向の各断面積が、導光体の底面５から中央部に向か
って次第に小面積になり、中央部において最小断面積と
なるような錐台形状であるとともに、導光体１の長さ方
向の各断面周の一点が導光体の長さ方向に水平、かつ直
線で結ばれる線を有し、その水平側表面を光出射面と
し、他側面の全面、あるいは一部を光拡散部２とした垂
錐台形状としてもよい。なお、本実施例に示したように
導光体１が円錐台状であれば、導光体１の断面形状は図
１３に示すように 導光体１の光出射面５に、二面の平
面部を形成し、その二平面による挟角が９０度である形
状としてもよい。本実施例において図１２に示した導光
体の両底面４の直径を５ｍｍ、中央部の断面円の直径を
２．７ｍｍ、光拡散層７１幅を１ｍｍ、溝深さを０．５
ｍｍとした時の従来との比較データを記載する。Further, as shown in FIG. 12, in the light guide body 1, each cross-sectional area in the lengthwise direction gradually becomes smaller from the bottom surface 5 of the light guide body toward the central portion, and the minimum cross section in the central portion. It has a frustum shape so as to have an area, and one point of each cross-sectional circumference in the length direction of the light guide 1 is horizontal in the length direction of the light guide and has a line connected by a straight line. The surface may be a light emitting surface, and the whole or a part of the other side surface may be a truncated cone shape having the light diffusing portion 2. If the light guide 1 has a truncated cone shape as shown in the present embodiment, the cross-sectional shape of the light guide 1 is two-sided with the light exit surface 5 of the light guide 1 as shown in FIG. The flat portion may be formed so that the angle formed by the two flat surfaces is 90 degrees. In this embodiment, the diameter of both bottom surfaces 4 of the light guide body shown in FIG. 12 is 5 mm, the diameter of the central cross section circle is 2.7 mm, the width of the light diffusion layer 71 is 1 mm, and the groove depth is 0.5.
The comparison data with the conventional value when mm is described.
【００３２】[0032]
【表１】 [Table 1]
【００３３】[0033]
【発明の効果】以上のように本発明の線状照明装置は、
透光性材料から成る導光体の底面部に発光体を備え、前
記導光体の形状を柱状、あるいは錐台状とし、前記導光
体の少なくとも一側表面にＶ型切削や溝を施し、さらに
前記Ｖ型切削面や溝面を粗面、あるいは三角波面に処理
して光拡散部を形成する構成とすることにより、被照明
原稿面での照明ムラをなくし、原稿面に限りなく近付い
ていっても照明ムラを悪化させずに原稿面照度をあげる
ことができる。しかも原稿面に限りなく近付けられるこ
とで本発明の線状照明装置を光学的画像読み取り装置の
照明系に使用すれば装置全体の小型化に寄与でき、携帯
ファクシミリ等の小型化が要求される機器への搭載が可
能となる。又、発光体の素子数を減らすことができ、低
コスト化が実現できる。As described above, the linear lighting device of the present invention is
The light guide body made of a translucent material is provided with a light emitter on its bottom surface, and the shape of the light guide body is columnar or frustum-shaped, and at least one side surface of the light guide body is V-shaped cut or grooved. Further, by arranging the V-shaped cutting surface or groove surface to be a rough surface or a triangular wave surface to form a light diffusing portion, uneven illumination on the illuminated original surface can be eliminated and the original surface can be approached as close as possible. Even so, it is possible to increase the illuminance of the document surface without deteriorating the uneven illumination. In addition, if the linear illumination device of the present invention is used in the illumination system of the optical image reading device because it can be brought as close as possible to the original surface, it is possible to contribute to downsizing of the entire device, and a device that requires downsizing such as a portable facsimile. Can be installed in Further, the number of elements of the light emitting body can be reduced, and cost reduction can be realized.
【図１】本発明の第１の実施例における線状照明装置の
構成図FIG. 1 is a configuration diagram of a linear lighting device according to a first embodiment of the present invention.
【図２】同実施例における発光体の発光角度分布（指向
特性）FIG. 2 is a view showing the light emitting angle distribution (directivity characteristic) of the light emitting body in the example.
【図３】同実施例における導光体内部の光の進み方の動
作説明図FIG. 3 is an operation explanatory diagram of how light travels inside the light guide body in the embodiment.
【図４】本発明の第一の実施例における光拡散部の概略
図FIG. 4 is a schematic view of a light diffusing unit in the first embodiment of the present invention.
【図５】本発明の光拡散部の拡大図FIG. 5 is an enlarged view of the light diffusing section of the present invention.
【図６】本発明の第一及び第二の実施例における導光体
の断面図FIG. 6 is a sectional view of a light guide according to the first and second embodiments of the present invention.
【図７】本発明の第二の実施例における導光体の斜視図FIG. 7 is a perspective view of a light guide according to a second embodiment of the present invention.
【図８】本発明の第三の実施例における導光体の斜視図FIG. 8 is a perspective view of a light guide according to a third embodiment of the present invention.
【図９】本発明の第三の実施例における光拡散部の概略
図FIG. 9 is a schematic view of a light diffusing unit in a third embodiment of the present invention.
【図１０】本発明の第四の実施例における導光体の斜視
図FIG. 10 is a perspective view of a light guide according to a fourth embodiment of the present invention.
【図１１】本発明の第四の実施例における光拡散部の概
略図FIG. 11 is a schematic view of a light diffusing unit in the fourth embodiment of the present invention.
【図１２】本発明の第四の実施例における導光体の斜視
図FIG. 12 is a perspective view of a light guide according to a fourth embodiment of the present invention.
【図１３】本発明の第四の実施例における導光体の断面
図FIG. 13 is a sectional view of a light guide according to a fourth embodiment of the present invention.
【図１４】従来の光学的画像読み取り装置の構成図FIG. 14 is a configuration diagram of a conventional optical image reading device.
【図１５】従来の線状照明装置の一種のＬＥＤアレイの
構成図FIG. 15 is a configuration diagram of a type of LED array of a conventional linear lighting device.
１ 導光体 ２ 光拡散部 ３ 発光体 ４ 導光体底面 ５ 光出射面 ３１ 臨界角以内の光線 ３２ 臨界角を越えた光線 ３３ 拡散光 ３４ 照明光 ４１ 完全反射層 ７１ 光拡散層 ８１ Ｖ型切削面 ９１ 完全反射層 １１１ 完全反射層 １４１ 原稿 １４２ ＬＥＤアレイ １４３ ロッドレンズアレイ １４４ 光電変換素子アレイ １５１ 基板 １５２ ＬＥＤチップ 1 Light Guide 2 Light Diffusing Part 3 Light Emitting Body 4 Light Guide Bottom 5 Light Emitting Surface 31 Light Ray Within Critical Angle 32 Light Ray Exceeding Critical Angle 33 Diffused Light 34 Illuminating Light 41 Perfect Reflection Layer 71 Light Diffusing Layer 81 V Type Cutting surface 91 Perfect reflection layer 111 Perfect reflection layer 141 Original document 142 LED array 143 Rod lens array 144 Photoelectric conversion element array 151 Substrate 152 LED chip
フロントページの続き (72)発明者 藤原 慎司 大阪府門真市大字門真1006番地 松下電器 産業株式会社内Front page continuation (72) Inventor Shinji Fujiwara 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.
Claims (53)
の少なくとも一側表面に光拡散部と、前記導光体の他側
表面に発光体とを備え、該発光体から放出された光を導
光体内部に入射し、前記光拡散部で反射、拡散された光
が、前記導光体の少なくとも一側表面から外部に出射す
る線状照明装置。1. A light guide body made of a translucent material, a light diffusing section on at least one surface of the light guide body, and a light emitting body on the other side surface of the light guide body. A linear lighting device in which emitted light is made incident on the inside of a light guide, and the light reflected and diffused by the light diffusing section is emitted to the outside from at least one surface of the light guide.
上（ＡＳＴＭ測定法Ｄ１００３による）の透光性材料を
用いたことを特徴とする請求項１に記載の線状照明装
置。2. The linear lighting device according to claim 1, wherein the light guide body is made of a translucent material having a light transmittance of 80% or more (according to ASTM measurement method D1003).
７の透光性材料を用いたことを特徴とする請求項１に記
載の線状照明装置。3. The light guide body is made of a material having a refractive index of 1.4 to 1.
7. The linear lighting device according to claim 1, wherein the translucent material of No. 7 is used.
ことを特徴とする請求項１記載の線状照明装置。4. The linear illumination device according to claim 1, wherein the light guide is made of acrylic.
作製したことを特徴とする請求項１記載の線状照明装
置。5. The linear illumination device according to claim 1, wherein the light guide is made of polycarbonate.
光拡散部は、光拡散層を形成するための溝を設けたこと
を特徴とする請求項１記載の線状照明装置。6. The linear lighting device according to claim 1, wherein the light diffusion portion provided on at least one surface of the light guide body is provided with a groove for forming a light diffusion layer.
光拡散部は、粗面であることを特徴とする請求項１記載
の線状照明装置。7. The linear lighting device according to claim 1, wherein the light diffusion portion provided on at least one surface of the light guide is a rough surface.
０１により中心線平均粗さＲaは（１００〜０．０１
３）ａ、最大高さＲmaxは（４００〜０．０５）Ｓであ
ることを特徴とする請求項７記載の線状照明装置。8. The light diffusing portion has a roughness according to JIS standard B06.
01, the centerline average roughness Ra is (100 to 0.01
3) a, and the maximum height R max is (400 to 0.05) S, The linear lighting device according to claim 7.
光拡散層部は、三角波面であることを特徴とする請求項
１に記載の線状照明装置。9. The linear illumination device according to claim 1, wherein the light diffusion layer portion provided on at least one surface of the light guide has a triangular wave surface.
０００μｍで、山の高さが２０μｍ〜８００μｍの三角
波面であることを特徴とする請求項９記載の線状照明装
置。10. The light diffusing section has a pitch of 50 μm to 2 μm.
The linear illumination device according to claim 9, wherein the linear illuminating device has a triangular wavefront having a height of 000 μm and a peak height of 20 μm to 800 μm.
も一側表面に、連続的に形成したことを特徴とする請求
項１に記載の線状照明装置。11. The linear lighting device according to claim 1, wherein the light diffusion portion is continuously formed on at least one surface of the light guide body.
も一側表面に、不連続的に形成したことを特徴とする請
求項１に記載の線状照明装置。12. The linear lighting device according to claim 1, wherein the light diffusion portion is discontinuously formed on at least one surface of the light guide.
とも一側表面に設けた光拡散部と、少なくとも一側表面
の光出射面と、発光体を備えた他側表面以外は完全光反
射層を形成したことを特徴とする請求項１に記載の線状
照明装置。13. The surface of the light guide is complete except for a light diffusing portion provided on at least one side surface of the light guide, a light emitting surface on at least one side surface, and the other side surface provided with a light emitter. The linear lighting device according to claim 1, wherein a light reflecting layer is formed.
特徴とする請求項１に記載の線状照明装置。14. The linear lighting device according to claim 1, wherein the light diffusion portion is a light diffusion layer.
から成ることを特徴とする請求項１４に記載の線状照明
装置。15. The linear illumination device according to claim 14, wherein the light diffusion layer is made of a light diffuser and a translucent resin.
屈折率よりも大きいことを特徴とする請求項１５に記載
の線状照明装置。16. The linear illumination device according to claim 15, wherein the light diffuser has a refractive index higher than that of the light guide.
の屈折率とほぼ等しいことを特徴とする請求項１５に記
載の線状照明装置。17. The linear lighting device according to claim 15, wherein the light-transmitting resin has a refractive index substantially equal to that of the light guide.
iＯ2）であることを特徴とする請求項１５に記載の線状
照明装置。18. The light diffuser comprises titanium dioxide (T
16. The linear lighting device according to claim 15, wherein the linear lighting device is i O 2 ).
チタン（ＴiＯ2）を用い、透光性樹脂としてシリコン樹
脂を用いたことを特徴とする請求項１５に記載の線状照
明装置。19. The optical diffusion layer, a titanium dioxide (T i O 2) as a light diffuser, a linear illumination according to claim 15, characterized in that a silicon resin as the translucent resin apparatus.
Ｄ）であることを特徴とする請求項１に記載の線状照明
装置。20. The light emitting device is a light emitting diode (LE).
It is D), The linear illuminating device of Claim 1 characterized by the above-mentioned.
性）が３０度〜１５０度であることを特徴とする請求項
１に記載の線状照明装置。21. The linear illumination device according to claim 1, wherein the luminous body has a luminous angle distribution (directional characteristic) of 30 degrees to 150 degrees.
柱状で、前記導光体の少なくとも一側表面に光拡散部
と、前記導光体の底面部に発光体とを備え、該発光体か
ら放出された光を導光体内部に入射し、前記導光体の少
なくとも他一側表面から外部に出射することを特徴とす
る請求項１に記載の線状照明装置。22. The light guide is columnar having a side surface portion and a bottom surface portion, and is provided with a light diffusion portion on at least one side surface of the light guide body, and a light emitting body on the bottom surface portion of the light guide body. The linear lighting device according to claim 1, wherein the light emitted from the light-emitting body is made incident on the inside of the light guide body and is emitted to the outside from at least the other side surface of the light guide body.
も一側表面に、一定幅で連続的に形成したことを特徴と
する請求項２２に記載の線状照明装置。23. The linear lighting device according to claim 22, wherein the light diffusing portion is continuously formed with a constant width on at least one surface of the light guide.
も一側表面に、前記導光体の両底面から中央部に向かっ
て次第に大きくなるように連続的に形成したことを特徴
とする請求項２２に記載の線状照明装置。24. The light diffusing portion is continuously formed on at least one side surface of the light guide body so as to gradually increase from both bottom surfaces of the light guide body toward a central portion thereof. The linear lighting device according to claim 22.
も一側表面に、不連続的に一定ピッチで、かつ一定形状
で形成したことを特徴とする請求項２２に記載の線状照
明装置。25. The linear illumination according to claim 22, wherein the light diffusion portion is discontinuously formed on at least one surface of the light guide body at a constant pitch and in a constant shape. apparatus.
も一側表面に、不連続的に一定ピッチで、かつ前記光拡
散部面積が前記導光体の両底面から中央部に向かって次
第に大きくなるように形成したことを特徴とする請求項
２２に記載の線状照明装置。26. The light diffusing section is discontinuously arranged at a constant pitch on at least one side surface of the light guide body, and the light diffusing section area extends from both bottom surfaces of the light guide body toward a central portion thereof. 23. The linear lighting device according to claim 22, wherein the linear lighting device is formed so as to become gradually larger.
も一側表面に、不連続的に一定形状で、かつ導光体の両
底面から中央部に向かって次第にピッチが狭くなるよう
に形成したことを特徴とする請求項２２に記載の線状照
明装置。27. The light diffusing portion has a discontinuous and constant shape on at least one side surface of the light guide, and the pitch is gradually narrowed from both bottom surfaces of the light guide toward the central portion. The linear lighting device according to claim 22, wherein the linear lighting device is formed.
特徴とした請求項２３〜２７のいずれかに記載の線状照
明装置。28. The linear illumination device according to claim 23, wherein the light diffusion portion is a light diffusion layer.
るいは一部に設けたことを特徴とした請求項２８に記載
の線状照明装置。29. The linear illumination device according to claim 28, wherein the light diffusion layer is provided on the entire surface or a part of the light diffusion portion.
光体の少なくとも一側表面（多角面部）に光拡散部と、
前記導光体の底面部に発光体とを備え、該発光体から放
出された光を導光体内部に入射し、前記導光体の少なく
とも他一側表面から外部に出射することを特徴とする請
求項２２に記載の線状照明装置。30. The light guide body has a polygonal prism shape, and a light diffusing portion is provided on at least one surface (polygonal surface portion) of the light guide body.
A light emitting body is provided on a bottom surface of the light guide body, light emitted from the light emitting body is made incident on the inside of the light guide body, and is emitted to the outside from at least another side surface of the light guide body. 23. The linear lighting device according to claim 22.
体の円曲面部の少なくとも一部表面に光拡散部と、前記
導光体の底面部に発光体とを備え、該発光体から放出さ
れた光を導光体内部に入射し、前記導光体の円曲面部の
少なくとも他一部表面から外部に出射することを特徴と
する請求項２２に記載の線状照明装置。31. The light guide body is in the shape of a cylinder, and is provided with a light diffusion portion on at least a part of the surface of the circular curved surface portion of the light guide body, and a light emitting body on the bottom surface portion of the light guide body. 23. The linear lighting device according to claim 22, wherein the light emitted from the light emitting body is made incident on the inside of the light guide body and is emitted to the outside from at least a part of the surface of the circular curved surface portion of the light guide body. .
表面の光出射面に、二面の平面部を形成し、前記二平面
による挟角を設けたことを特徴とする請求項３１に記載
の線状照明装置。32. The light emitting surface of at least a part of the surface of the circularly curved surface of the light guide is formed with two flat surfaces, and an angle formed by the two flat surfaces is provided. The linear lighting device according to.
る請求項３２記載の線状照明装置。33. The linear illumination device according to claim 32, wherein the included angle is a right angle.
前記導光体の両底面から中央部に向かって次第に大きく
なるように斜めに、かつ平面でＶ型に切削し、中央部に
おいて切削面が最大幅を持つようなＶ型切削面にするこ
とを特徴とする請求項２２に記載の線状照明装置。34. At least one circular curved surface portion of the light guide,
The V-shaped cutting surface is cut obliquely and in a plane so as to be gradually increased from both bottom surfaces of the light guide toward the central portion, and a V-shaped cutting surface is formed so that the cutting surface has the maximum width in the central portion. 23. The linear lighting device according to claim 22, wherein the linear lighting device is characterized in that:
光拡散部としたことを特徴とする請求項３４に記載の線
状照明装置。35. The linear lighting device according to claim 34, wherein the entire or part of the V-shaped cutting surface is a light diffusing portion.
前記導光体の両底面から中央部に向かって次第に小面積
になり、中央部において最小断面積となるような側面部
と底面部を有する錐台形状で、前記導光体の少なくとも
一側表面に光拡散部と、前記導光体の底面部に発光体と
を備え、該発光体から放出された光を導光体内部に入射
し、前記導光体の少なくとも他一側表面から外部に出射
することを特徴とする請求項１に記載の線状照明装置。36. The light guide has a sectional area of the light guide,
At least one side surface of the light guide body having a truncated cone shape having a side surface portion and a bottom surface portion each having a gradually decreasing area from both bottom surfaces of the light guide body toward the center portion and having a minimum cross-sectional area in the center portion. A light diffusing section and a light-emitting body on the bottom surface of the light guide body, the light emitted from the light-emitting body is made incident on the inside of the light guide body, and the light is guided to the outside from at least one other surface of the light guide body. It emits, The linear illuminating device of Claim 1 characterized by the above-mentioned.
も一側表面に、一定幅で連続的に形成したことを特徴と
する請求項３６に記載の線状照明装置。37. The linear lighting device according to claim 36, wherein the light diffusing portion is continuously formed with a constant width on at least one side surface of the light guide.
も一側表面に、前記導光体の両底面から中央部に向かっ
て次第に大きくなるように連続的に形成したことを特徴
とする請求項３６に記載の線状照明装置。38. The light diffusing portion is continuously formed on at least one surface of the light guide body so as to gradually increase from both bottom surfaces of the light guide body toward a central portion thereof. The linear lighting device according to claim 36.
も一側表面に、不連続的に一定ピッチで、かつ一定形状
で形成したことを特徴とする請求項３６に記載の線状照
明装置。39. The linear illumination according to claim 36, wherein the light diffusing portion is discontinuously formed on at least one surface of the light guide body at a constant pitch and in a constant shape. apparatus.
も一側表面に、不連続的に一定ピッチで、かつ前記光拡
散部面積が前記導光体の両底面から中央部に向かって次
第に大きくなるように形成したことを特徴とする請求項
３６に記載の線状照明装置。40. The light diffusing portion is discontinuously provided at a constant pitch on at least one side surface of the light guide body, and the light diffusing portion area extends from both bottom surfaces of the light guide body toward a central portion thereof. 37. The linear lighting device according to claim 36, wherein the linear lighting device is formed so as to become gradually larger.
も一側表面に、不連続的に一定形状で、かつ導光体の両
底面から中央部に向かって次第にピッチが狭くなるよう
に形成したことを特徴とする請求項３６記載の線状照明
装置。41. The light diffusing section has a discontinuous and constant shape on at least one side surface of the light guide, and the pitch is gradually narrowed from both bottom surfaces of the light guide toward the central portion. 37. The linear lighting device according to claim 36, which is formed.
特徴とした請求項３７〜４１のいずれかに記載の線状照
明装置。42. The linear illumination device according to claim 37, wherein the light diffusion portion is a light diffusion layer.
るいは一部に設けたことを特徴とした請求項４２に記載
の線状照明装置。43. The linear lighting device according to claim 42, wherein the light diffusion layer is provided on the entire surface or a part of the light diffusion portion.
前記導光体の両底面から中央部に向かって、前記両底面
と相似形で次第に小面積になり、中央部において最小断
面積となるような多角錐台形状であり、前記導光体の少
なくとも一側表面（多角面部）に光拡散部と、前記導光
体の底面部に発光体とを備え、該発光体から放出された
光を導光体内部に入射し、前記導光体の少なくとも他一
側表面から外部に出射することを特徴とする請求項３６
に記載の線状照明装置。44. The light guide has a cross-sectional area of the light guide,
From the bottom surfaces of the light guide toward the central portion, a polygonal truncated pyramid shape similar to the bottom surfaces and having a gradually smaller area, and having a minimum cross-sectional area at the central portion. A light diffusing portion is provided on one surface (polygonal surface portion) and a light emitting body is provided on the bottom surface of the light guide body, and light emitted from the light emitting body enters the light guide body, and at least the light guide body is provided. 37. The light is emitted from the other side surface to the outside.
The linear lighting device according to.
異なる円であり、前記導光体の両底面から中央部に向か
って、次第に細径になり、中央部において最小径円とな
るような円錐台形状であり、前記導光体の円曲面部の少
なくとも一部表面に光拡散部と、前記導光体の底面部に
発光体とを備え、該発光体から放出された光を導光体内
部に入射し、前記導光体の円曲面部の少なくとも他一部
表面から外部に出射することを特徴とする請求項３６に
記載の線状照明装置。45. The light guide is a circle in which each cross section in the lengthwise direction has a different diameter, and the diameter is gradually reduced from both bottom surfaces of the light guide toward the central portion, and the minimum diameter is obtained at the central portion. It has a circular truncated cone shape and is provided with a light diffusing portion on at least a part of the surface of the circular curved surface of the light guide, and a light emitter on the bottom surface of the light guide, and the light is emitted from the light emitter. 37. The linear lighting device according to claim 36, wherein the emitted light is made incident on the inside of the light guide body and is emitted to the outside from at least another part of the surface of the circular curved surface portion of the light guide body.
出射面に、二面の平面部を形成し、前記二平面による挟
角を設けたことを特徴とする請求項４５に記載の線状照
明装置。46. The light guide surface of at least one circular curved surface portion of the light guide body is formed with two flat surfaces, and an angle formed by the two flat surfaces is provided. Linear lighting device.
る請求項４６記載の線状照明装置。47. The linear illumination device according to claim 46, wherein the included angle is a right angle.
前記導光体の両底面から中央部に向かって次第に小面積
になり、中央部において最小断面積となるような側面部
と底面部を有する錐台形状であるとともに、前記導光体
の長さ方向の各断面周の一点が前記導光体の長さ方向に
水平、かつ直線で結ばれる線を有する垂錐台形状である
ことを特徴とする請求項３６に記載の線状照明装置。48. The light guide body, wherein each cross-sectional area in the longitudinal direction is:
The light guide body has a frustum shape having a side surface portion and a bottom surface portion that have a gradually decreasing area from both bottom surfaces toward the center portion and have a minimum cross-sectional area in the center portion, and the length of the light guide body. 37. The linear illumination device according to claim 36, wherein one point of each cross-sectional circumference in the direction is a truncated pyramid shape having a line that is horizontal and is connected by a straight line in the length direction of the light guide.
特徴とする請求項４８に記載の線状照明装置。49. The linear illumination device according to claim 48, wherein the light guide has a circular cross-sectional shape.
し、他側表面の全面、あるいは一部を光拡散部としたこ
とを特徴とする請求項４８に記載の線状照明装置。50. The linear illumination device according to claim 48, wherein the light guide has a horizontal surface as a light emitting surface and the other surface as a whole or a part thereof as a light diffusing portion. .
に、二面の平面部を形成し、前記二平面による挟角を設
けたことを特徴とする請求項４８に記載の線状照明装
置。51. The line according to claim 48, wherein a two-sided flat surface portion is formed on a horizontal surface, which is a light emitting surface of the light guide, and an angle formed by the two flat surfaces is provided. Lighting device.
る請求項５０記載の線状照明装置。52. The linear illumination device according to claim 50, wherein the included angle is a right angle.
の７０％以下であることを特徴とする請求項４８に記載
の線状照明装置。53. The linear lighting device according to claim 48, wherein the light guide has a cross-sectional area of the central portion of 70% or less of the bottom area.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6180009A JP2900799B2 (en) | 1994-08-01 | 1994-08-01 | Linear lighting device |
| TW85102511A TW290670B (en) | 1994-08-01 | 1996-03-01 | |
| US09/344,075 US6268600B1 (en) | 1994-08-01 | 1999-06-25 | Linear illumination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6180009A JP2900799B2 (en) | 1994-08-01 | 1994-08-01 | Linear lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0843633A true JPH0843633A (en) | 1996-02-16 |
| JP2900799B2 JP2900799B2 (en) | 1999-06-02 |
Family
ID=16075865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6180009A Expired - Fee Related JP2900799B2 (en) | 1994-08-01 | 1994-08-01 | Linear lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2900799B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP0863422A2 (en) * | 1997-03-04 | 1998-09-09 | Matsushita Electric Industrial Co., Ltd. | Linear beam irradiator |
| JPH11134918A (en) * | 1997-03-04 | 1999-05-21 | Matsushita Electric Ind Co Ltd | Linear lighting system |
| US6204938B1 (en) | 1997-07-14 | 2001-03-20 | Matsushita Electric Industrial Co., Ltd. | Linear illumination device and image reading apparatus using the same |
| JP2005031412A (en) * | 2003-07-14 | 2005-02-03 | Tokai Rika Co Ltd | Light guide and illuminated switching device using the same |
| US7088905B1 (en) | 2004-05-26 | 2006-08-08 | Nippon Sheet Glass Co., Ltd. | Light guide, line-illuminating device, and image-scanning device |
| JP2007221360A (en) * | 2006-02-15 | 2007-08-30 | Rohm Co Ltd | Image reading apparatus and manufacturing method thereof |
| JP2007283980A (en) * | 2006-04-19 | 2007-11-01 | Hamani Kasei Kk | Decorative light-emitting element |
| JP2008147847A (en) * | 2006-12-07 | 2008-06-26 | Rohm Co Ltd | Linear light source unit and image reading apparatus |
| JP2008219333A (en) * | 2007-03-02 | 2008-09-18 | Rohm Co Ltd | Linear light source device |
| JP2008219337A (en) * | 2007-03-02 | 2008-09-18 | Rohm Co Ltd | Linear light source device |
| US7498559B2 (en) | 2004-09-22 | 2009-03-03 | Sharp Kabushiki Kaisha | Optical discharge apparatus and image forming apparatus containing the same |
| JP2010204539A (en) * | 2009-03-05 | 2010-09-16 | Ricoh Co Ltd | Original lighting device, image reading apparatus and image forming apparatus |
| JP2011112812A (en) * | 2009-11-26 | 2011-06-09 | Oki Data Corp | Static eliminator, developing device, and image forming apparatus |
| CN102121675A (en) * | 2009-12-18 | 2011-07-13 | 优志旺电机株式会社 | Linear light source |
| CN102182981A (en) * | 2009-12-28 | 2011-09-14 | 优志旺电机株式会社 | LED linear light source and reading apparatus |
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| JP2014165057A (en) * | 2013-02-26 | 2014-09-08 | Rohm Co Ltd | Light guide body, linear light source unit, image reading device, and document scanner |
| JP2016186899A (en) * | 2015-03-27 | 2016-10-27 | 京セラ株式会社 | Light guide body, illumination unit and image reading device |
| JP2017033896A (en) * | 2015-08-06 | 2017-02-09 | サカエ理研工業株式会社 | Vehicular lighting fixture |
| JP2018506153A (en) * | 2015-02-05 | 2018-03-01 | ヴァレオ ビジョンＶａｌｅｏ Ｖｉｓｉｏｎ | Light guide with means to compensate for the gradual loss of light along the guide |
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| US7614772B2 (en) | 2006-05-26 | 2009-11-10 | Toyoda Gosei Co., Ltd. | Linear light emitting apparatus |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02284102A (en) * | 1989-04-26 | 1990-11-21 | Mitsubishi Rayon Co Ltd | Linear light source and light trap used for this light source |
-
1994
- 1994-08-01 JP JP6180009A patent/JP2900799B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02284102A (en) * | 1989-04-26 | 1990-11-21 | Mitsubishi Rayon Co Ltd | Linear light source and light trap used for this light source |
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|---|---|---|---|---|
| JPH11134918A (en) * | 1997-03-04 | 1999-05-21 | Matsushita Electric Ind Co Ltd | Linear lighting system |
| EP0863422A3 (en) * | 1997-03-04 | 2000-08-23 | Matsushita Electric Industrial Co., Ltd. | Linear beam irradiator |
| US6351594B1 (en) * | 1997-03-04 | 2002-02-26 | Matsushita Electric Industrial Co., Ltd. | Linear beam irradiator having a varying cross-sectional size |
| EP0863422A2 (en) * | 1997-03-04 | 1998-09-09 | Matsushita Electric Industrial Co., Ltd. | Linear beam irradiator |
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| JP2900799B2 (en) | 1999-06-02 |
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| LAPS | Cancellation because of no payment of annual fees |