JPH10150526A - Linear illuminator - Google Patents
Linear illuminatorInfo
- Publication number
- JPH10150526A JPH10150526A JP8306481A JP30648196A JPH10150526A JP H10150526 A JPH10150526 A JP H10150526A JP 8306481 A JP8306481 A JP 8306481A JP 30648196 A JP30648196 A JP 30648196A JP H10150526 A JPH10150526 A JP H10150526A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light guide
- lighting device
- linear lighting
- 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
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Facsimile Heads (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば光学的画像
読取装置において原稿面を主走査方向に線状に照明する
線状照明装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear illumination device for linearly illuminating a document surface in a main scanning direction in, for example, an optical image reading device.
【０００２】[0002]
【従来の技術】従来の線状照明装置を便宜上、光学的画
像読取装置を例にとって説明する。2. Description of the Related Art For convenience, a conventional linear illumination device will be described by taking an optical image reading device as an example.
【０００３】近年、光学的画像読取装置は、ファクシミ
リ，スキャナー，バーコードリーダー等の読取装置とし
て広く使用されており、この種の装置の原稿照明系には
発光ダイオード(ＬＥＤ)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, optical image reading apparatuses have been widely used as reading apparatuses such as facsimile machines, scanners, and bar code readers, and a light emitting diode (LED) chip is arranged in a line in a document illumination system of this type of apparatus. LEDs arranged
Array is being used.
【０００４】以下図面を参照しながら、上記した従来の
光学的画像読取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。Hereinafter, an example of a linear illumination device used in the above-described conventional optical image reading device will be described with reference to the drawings.
【０００５】図５は従来の光学的画像読取装置の構造図
を示すものである。図５において、41は原稿、42は原稿
を照射する線状照明装置としてのＬＥＤアレイ、43は原
稿で反射した光情報を正立等倍で導くロッドレンズアレ
イ、44はロッドレンズアレイ43により導かれた光情報を
取り込み電気信号に変換する光電変換素子アレイであ
る。また、図６は従来のＬＥＤアレイ42の構成を示した
外観斜視図であり、回路導体層を施した基板51上にＬＥ
Ｄチップ52を複数個、直線状に所定間隔を置いて並べて
配置してある。FIG. 5 is a structural view of a conventional optical image reading apparatus. In FIG. 5, reference numeral 41 denotes a document, 42 denotes an LED array as a linear illumination device for irradiating the document, 43 denotes a rod lens array for guiding optical information reflected by the document at an equal magnification, and 44 denotes a rod lens array. This is a photoelectric conversion element array that takes in optical information and converts it into an electric signal. FIG. 6 is an external perspective view showing the structure of a conventional LED array 42, in which a LE 51 is provided on a substrate 51 provided with a circuit conductor layer.
A plurality of D chips 52 are linearly arranged at predetermined intervals.
【０００６】以上のように構成された光学的画像読取装
置及び線状照明装置に関して、以下にその動作を説明す
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42からの光を読取るべ
き原稿41に照射し(矢印ａ)、その原稿光をロッドレンズ
アレイ43で正立等倍で光電変換素子アレイ44に導き、電
気信号に変換して原稿読取りを行っていた。First, the light from the LED array 42 is irradiated on the original 41 to be read (arrow a), and the original light is guided to the photoelectric conversion element array 44 by the rod lens array 43 at the same erect magnification and converted into an electric signal. And read the original.
【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
うな構成の線状照明装置(ＬＥＤアレイ)42では、ＬＥＤ
チップ52の指向特性のため、照明効率が低く(副走査方
向に広がる)、また原稿面照度のばらつきが大きくなる
ため、画像読取りの性能を低下させていた。また原稿41
からＬＥＤアレイ42までは、ある程度距離をおく必要が
あり、ユニット自体のサイズも大きなものとなり、さら
に数多くのＬＥＤチップを使用するためコストアップの
要因となっていた。However, in the linear lighting device (LED array) 42 having the above structure, the LED
Due to the directional characteristics of the chip 52, the illumination efficiency is low (spreads in the sub-scanning direction), and the illuminance of the document surface varies widely, thus deteriorating the image reading performance. Manuscript 41
It is necessary to keep a certain distance from the LED array 42 to the LED array 42, the size of the unit itself becomes large, and the use of a large number of LED chips causes a cost increase.
【０００９】本発明はこのような点に鑑み、原稿面への
照度効率が高く、照度のばらつきが小さい線状照明装置
の提供を目的とする。SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a linear illuminator having high illuminance efficiency on a document surface and small illuminance variation.
【００１０】[0010]
【課題を解決するための手段】上記問題を解決し、目的
を達成するために本発明の線状照明装置は、導光体を用
い、その端部(両端または一端)表面から光を入射させ、
導光体の一側表面に設けた多数の三角波からなる光屈折
及びまたは反射領域により光を曲げ、線状に出射させる
構成をとる。これにより、原稿面照度のばらつきの心配
がなくなり、線状照明装置から原稿面までの距離を短く
できるとともに、光の伝送効率を飛躍的に向上させるこ
とができ、さらに光源としてのＬＥＤチップ数の飛躍的
削減も可能となり低コスト化の実現を図ることができる
ようにしたものである。In order to solve the above problems and achieve the object, a linear illuminating apparatus according to the present invention uses a light guide and allows light to enter from an end (both ends or one end) surface thereof. ,
A configuration is employed in which light is bent by a light refraction and / or reflection region composed of a large number of triangular waves provided on one surface of the light guide, and emitted linearly. As a result, there is no need to worry about variations in the illuminance of the original surface, the distance from the linear illuminator to the original surface can be reduced, the light transmission efficiency can be significantly improved, and the number of LED chips as a light source can be reduced. Dramatic reduction is also possible, and cost reduction can be realized.
【００１１】[0011]
【発明の実施の形態】本発明の線状照明装置は、原稿照
明幅(主走査方向)の長さを持つ透光性材料からなる導光
体を用い、この導光体の長手方向の一側表面に光屈折及
びまたは反射領域を多数の三角波により形成し、導光体
の端部表面(両端または一端)に光源を配置し、導光体に
入射した光束を光屈折及びまたは反射領域で曲げて、対
応する導光体の他一側表面から出射させ、線状を照明す
る構成としたものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS A linear illuminating device according to the present invention uses a light guide made of a translucent material having a length of a document illumination width (main scanning direction). A light refraction and / or reflection region is formed by a large number of triangular waves on the side surface, a light source is arranged on the end surface (both ends or one end) of the light guide, and a light beam incident on the light guide is refracted and / or reflected by the light guide. The light guide is bent and emitted from the other side surface of the corresponding light guide to illuminate a linear shape.
【００１２】その結果、光伝送効率を向上させ原稿面照
度を上げるとともに、原稿面照度のばらつきを抑えるこ
とができ、さらに画像読取りの性能を向上させることが
できる。また、ＬＥＤアレイから原稿面までの距離を短
くすることができ、ＬＥＤチップ数の削減による低コス
ト化を可能にするとともに、光学的原稿読取装置自体の
小型・軽量化も実現可能とする。As a result, it is possible to improve the light transmission efficiency and raise the illuminance on the original surface, suppress the variation in the illuminance on the original surface, and further improve the image reading performance. Further, the distance from the LED array to the document surface can be shortened, so that the cost can be reduced by reducing the number of LED chips, and the optical document reader itself can be reduced in size and weight.
【００１３】以下、本発明の線状照明装置について、図
面を参照しながら説明する。Hereinafter, a linear lighting device according to the present invention will be described with reference to the drawings.
【００１４】（実施の形態１）図１は本発明の実施の形
態１における線状照明装置の構成を示す図であり、図１
(a)，(b)，(c)は、各々線状照明装置の側面断面図，平
面図，正面Ａ−Ａ’断面図である。図１において、１
は、透光性材料よりなり、両端から中央部へ行くに従い
断面積(円の径)が小さくなるように構成した導光体、２
は導光体１の長手方向の一側表面に設けられた多数の三
角波からなる光屈折／反射領域で、その一部の拡大図を
丸印破線内に示す。３は回路基板、４は発光ダイオード
(ＬＥＤ)素子、５は回路基板の表面上に形成した凹反射
面、６は発光ダイオード(ＬＥＤ)素子４からの光を導光
体１に導く接続部、７は接続部６の外周に形成された光
拡散層である。(Embodiment 1) FIG. 1 is a diagram showing a configuration of a linear illumination device according to Embodiment 1 of the present invention.
(a), (b), and (c) are a side sectional view, a plan view, and a front AA ′ sectional view of the linear illumination device, respectively. In FIG. 1, 1
Is a light guide made of a translucent material and configured such that the cross-sectional area (diameter of a circle) decreases from the ends to the center.
Is a light refraction / reflection region composed of a number of triangular waves provided on one surface in the longitudinal direction of the light guide 1, and an enlarged view of a part of the region is shown within a broken line with a circle. 3 is a circuit board, 4 is a light emitting diode
(LED) element, 5 is a concave reflection surface formed on the surface of the circuit board, 6 is a connecting part for guiding light from the light emitting diode (LED) element 4 to the light guide 1, and 7 is formed on the outer periphery of the connecting part 6. This is the light diffusion layer formed.
【００１５】以上のように構成された本実施の形態１に
かかる線状照明装置について、さらに具体的に説明す
る。まず、厚み0.6〜2.0mmのＡl基板の上に絶縁層を100
μm程度形成し、その上に銅箔(厚み35〜70μm)を貼り、
エッチングにより回路を形成し、その上に金(Ａu)を0.3
μm程度電解(または無電解)メッキにより形成して回路
基板３を作製する。次に、凸金型によるスタッピング法
により回路基板３の表面に凹反射面５を形成する。この
凹反射面の形状としては、逆円錐台形が効率よく発光ダ
イオード(ＬＥＤ)素子４からの光を前方へ、しかも必要
な角度分布で放射することができたので採用した。The linear illumination device according to the first embodiment configured as described above will be described more specifically. First, an insulating layer was placed on an Al substrate having a thickness of 0.6 to 2.0 mm.
μm, copper foil (thickness 35-70μm) is stuck on it,
A circuit is formed by etching, and gold (Au) is added on top of 0.3
A circuit board 3 is formed by electrolytic (or electroless) plating of about μm. Next, the concave reflection surface 5 is formed on the surface of the circuit board 3 by a stapling method using a convex mold. As the shape of the concave reflection surface, an inverted truncated cone was adopted because the light from the light emitting diode (LED) element 4 could be efficiently radiated forward and at a required angle distribution.
【００１６】次にダイマウンターを用いて、発光ダイオ
ード(ＬＥＤ)素子４を回路基板３に凹反射面５の逆円錐
台形の底面上に実装する。発光ダイオード(ＬＥＤ)素子
４としては、モノクロ画像読取用としてはＧaＰまたは
高輝度のものが必要な場合には４元系の例えばＡlＧaIn
Ｐ等の緑色のベアチップを用いる。また、カラー画像読
取用の線状照明装置の場合にはＲ(赤)，Ｇ(緑)，Ｂ(青)
の３色のＬＥＤチップを並べて実装すればよい。このよ
うにして光源部を作製する。Next, a light emitting diode (LED) element 4 is mounted on the circuit board 3 on the inverted frustoconical bottom surface of the concave reflection surface 5 using a die mounter. The light emitting diode (LED) element 4 is a quaternary system such as AlGaIn when a monochrome or high-luminance element is required for monochrome image reading.
A green bare chip such as P is used. In the case of a linear illumination device for reading color images, R (red), G (green), B (blue)
The three color LED chips may be mounted side by side. Thus, a light source unit is manufactured.
【００１７】次に、導光体１及びこれに設けられている
光屈折／反射領域２である多数の三角波面及び接続部６
に関しては、透明樹脂によるインジェクション成形によ
り一体で作製する。光屈折／反射領域２である多数の三
角波面は、導光体１の凹溝底面に形成される構成をとっ
ている。透明樹脂の材料としては、透光性，耐熱性，イ
ンジェクション成形時の樹脂の流れ性を考慮すると、耐
熱アクリル、ポリカーボネイト、非晶質ポリオレフィン
等が適している。さらに、接続部６の外周の透明シリコ
ン樹脂にＴiＯ2を混ぜ合わせた拡散材を塗布して光拡散
層７を形成する。この光拡散層７に関しては、白色樹脂
で作製したキャップを差し込んで構成してもよい。これ
で導光体部が完成する。Next, a light guide 1 and a number of triangular wavefronts and connection portions 6 which are light refraction / reflection regions 2 provided in the light guide 1 are provided.
Is integrally manufactured by injection molding using a transparent resin. A large number of triangular wavefronts, which are the light refraction / reflection regions 2, are formed on the bottom of the concave groove of the light guide 1. As the material of the transparent resin, heat-resistant acryl, polycarbonate, amorphous polyolefin, and the like are suitable in consideration of light transmission, heat resistance, and flowability of the resin during injection molding. Further, the light diffusion layer 7 is formed by applying a diffusion material obtained by mixing TiO 2 to the transparent silicon resin on the outer periphery of the connection portion 6. The light diffusion layer 7 may be configured by inserting a cap made of white resin. This completes the light guide.
【００１８】最後に、光源部と導光体部を、導光体材料
と同じ屈折率(約1.5)の透明樹脂を介して接続する。こ
の透明樹脂に関しては、エポキシ系や変性アクリレート
系のＵＶ硬化型樹脂を用いた。Finally, the light source unit and the light guide unit are connected via a transparent resin having the same refractive index (about 1.5) as the light guide material. As the transparent resin, an epoxy or modified acrylate UV curable resin was used.
【００１９】このようにして作製した本実施の形態１に
係る線状照明装置の動作原理及び特性について図２を参
照しながら説明する。図２は図１における線状照明装置
の側面断面図(a)の拡大図であり、光の進む様子を矢印
ｂで示したものである。The operation principle and characteristics of the linear lighting device according to the first embodiment thus manufactured will be described with reference to FIG. FIG. 2 is an enlarged view of a side sectional view (a) of the linear lighting device in FIG. 1, and shows how light travels by an arrow b.
【００２０】次に動作を説明すると、発光ダイオード
(ＬＥＤ)素子４から放出された光のうち、発光角度が前
方に出射した光成分ｂ1は直接接続部６に入射し、横方
向に出射した光成分ｂ2は、凹反射面５で反射されて接
続部６に入射する。この接続部６に入射した光成分のう
ち、直接導光体１に入射した光成分ｂ3は、全て導光体
１の側面で全反射を繰り返しながら、いずれ光屈折／反
射領域２に到達し、ここで屈折または反射されることに
より急激に角度を曲げられ、これに対向する他側面から
下方へと出射され、原稿面を照射する。接続部６から直
接導光体１へ入射した殆ど全ての光成分が導光体１の側
面で全反射するように、接続部６の径をＤ、接続部６の
長さをＬ、接続部６及び導光体１の屈折率をｎLGとする
と、Next, the operation will be described.
Of the light emitted from the (LED) element 4, the light component b 1 emitted forward at an emission angle is directly incident on the connection portion 6, and the light component b 2 emitted in the lateral direction is reflected by the concave reflection surface 5. Then, the light enters the connection portion 6. Of the light components incident on the connection portion 6, the light components b 3 directly incident on the light guide 1 all reach the light refraction / reflection region 2 while repeating total reflection on the side surface of the light guide 1. Here, the angle is sharply bent due to refraction or reflection, and the light is emitted downward from the other side opposite to this, and irradiates the original surface. The diameter of the connecting part 6 is L, the length of the connecting part 6 is L, and the connecting part is so that almost all light components directly incident on the light guide 1 from the connecting part 6 are totally reflected on the side surface of the light guide 1. Assuming that the refractive indices of 6 and 1 are nLG,
【００２１】[0021]
【数３】 Ｌ＞（Ｄ／２）ｔａｎ（ｓｉｎ~1(１／ｎLG)） なる条件を満たすように、各々ディメンジョンを決定し
ている。## EQU00003 ## The dimensions are determined so as to satisfy the condition of L> (D / 2) tan (sin- 1 (1 / nLG)).
【００２２】接続部６に入射した光のうち、この接続部
６の側面に到達する光成分ｂ2は、光拡散層７により拡
散され、その大部分を導光体１へ入射できるようにして
いる。この導光体１へ入射した光の成分ｂ3は、同じく
導光体１の側面から直接出射するか、または何回か側面
で全反射を繰り返しながら光屈折／反射領域２に到達
し、急激に角度を曲げられ、導光体１から下方へ出射し
て原稿を照明する。もしこの光拡散層７がなければ、光
は接続部６の側面から直接外側へ出射され、接続部６の
直下での原稿面の照度が著しく高くなり照度ばらつきが
大きくなってしまう。The light component b 2 arriving at the side surface of the connection portion 6 out of the light incident on the connection portion 6 is diffused by the light diffusion layer 7 so that most of the light component b 2 can enter the light guide 1. I have. The component b 3 of the light incident on the light guide 1 is emitted directly from the side surface of the light guide 1 or reaches the light refraction / reflection region 2 while repeating total reflection several times on the side surface. The light is emitted downward from the light guide 1 to illuminate the original. If the light diffusion layer 7 is not provided, the light is emitted directly from the side surface of the connection portion 6 to the outside, and the illuminance of the document surface immediately below the connection portion 6 is significantly increased, and the illuminance variation is increased.
【００２３】このような動作原理に基づき、Ａ４サイズ
用の線状照明装置を作製しその特性を評価した。Based on such an operation principle, a linear illuminator for A4 size was manufactured and its characteristics were evaluated.
【００２４】これにより、ＬＥＤ素子(ＧaＰ、λ＝565n
m)が４素子で、原稿面照度300lux、照度ばらつき約10％
を実現した。これを従来のＬＥＤアレイと比較するとＬ
ＥＤ素子数を約１／６に削減することができ、また照明
装置から原稿面までの距離では、従来ＬＥＤアレイが約
８〜10mm程度必要であったのが、本線状照明装置では1.
5mmに近づけても十分照度ばらつきを抑えることができ
た。これにより、50％は低コスト化を実現することがで
きるとともに、本線状照明装置を搭載した画像読取装置
自体の、そのサイズを約半分にすることができた。Thus, the LED element (GaP, λ = 565n)
m) is 4 elements, the original surface illuminance 300lux, illuminance variation about 10%
Was realized. When this is compared with the conventional LED array, L
The number of ED elements can be reduced to about 1/6, and the distance from the illuminating device to the document surface has conventionally required about 8 to 10 mm for the LED array.
Even when the distance was close to 5 mm, the variation in illuminance was sufficiently suppressed. As a result, the cost can be reduced by 50%, and the size of the image reading apparatus itself equipped with the main linear illumination device can be reduced to about half.
【００２５】また、赤色ＬＥＤ(ＧaＡlＡs)素子、純緑
色ＬＥＤ(ＧaＮ)素子、青色ＬＥＤ(ＧaＮ)素子を各々１
素子ずつ実装し、赤→緑→青と順次点灯することにより
光源切替型のカラー画像読取装置用の線状照明装置も実
現できた。A red LED (GaAlAs) element, a pure green LED (GaN) element, and a blue LED (GaN) element are each one.
By mounting the devices one by one and sequentially lighting red, green, and blue, a linear illumination device for a color image reading device of a light source switching type was realized.
【００２６】（実施の形態２）図３は本発明の実施の形
態２における線状照明装置の構成図であり、図３(a)，
(b)，(c)は、各々線状照明装置の側面断面図、平面図、
正面Ｂ−Ｂ’断面図である。図３において、21は導光
体、22は導光体21の長手方向の一側表面に設けられた多
数の三角波面からなるに光屈折／反射領域、23は回路基
板、24は発光ダイオード(ＬＥＤ)素子、25は回路基板23
の表面上に形成した凹反射面、26は発光ダイオード(Ｌ
ＥＤ)素子24からの光を導光体21に導く接続部、27は接
続部26の外周に形成された光拡散層、28は他端部、29は
他端部28の外周に形成された光拡散層、30は他端面に形
成された光反射層である。なお、導光体21は図３に示す
ように左端の光拡散層27側から右端の光拡散層29側に向
けて次第に大きさが小さくなるように形成されている。(Embodiment 2) FIG. 3 is a block diagram of a linear illumination device according to Embodiment 2 of the present invention.
(b), (c) is a side sectional view, a plan view,
It is front BB 'sectional drawing. In FIG. 3, reference numeral 21 denotes a light guide, 22 denotes a light refraction / reflection region formed of a large number of triangular wave surfaces provided on one longitudinal surface of the light guide 21, 23 denotes a circuit board, and 24 denotes a light emitting diode ( LED) element, 25 is the circuit board 23
26 is a concave reflecting surface formed on the surface of the light emitting diode (L
ED) A connection portion for guiding light from the element 24 to the light guide 21, a light diffusion layer 27 formed on the outer periphery of the connection portion 26, a second end portion 28, and a 29 formed on the outer periphery of the other end portion 28. The light diffusion layer 30 is a light reflection layer formed on the other end surface. As shown in FIG. 3, the light guide 21 is formed so as to gradually decrease in size from the left end light diffusion layer 27 side to the right end light diffusion layer 29 side.
【００２７】以上のように構成された本実施の形態２に
かかる線状照明装置について、さらに具体的に説明す
る。まず、厚み0.6〜2.0mmのＡl基板の上に絶縁層を100
μm程度形成し、その上に銅箔(厚み35〜70μm)を貼り、
エッチングにより回路を形成し、その上に金(Ａu)を0.3
μm程度電解(または無電解)メッキにより形成して回路
基板23を作製する。次に凸金型によるスタンピング法に
より回路基板23の表面に凹反射面25を形成する。この凹
反射面の形状としては、逆円錐台形が効率よく発光ダイ
オード(ＬＥＤ)素子24からの光を前方へ、しかも必要な
角度分布で放射することができたので採用した。The linear lighting device according to the second embodiment configured as described above will be described more specifically. First, an insulating layer was placed on an Al substrate having a thickness of 0.6 to 2.0 mm.
μm, copper foil (thickness 35-70μm) is stuck on it,
A circuit is formed by etching, and gold (Au) is added on top of 0.3
The circuit board 23 is manufactured by forming a plating of about μm by electrolytic (or non-electrolytic) plating. Next, a concave reflecting surface 25 is formed on the surface of the circuit board 23 by a stamping method using a convex mold. As the shape of the concave reflecting surface, an inverted truncated conical shape was adopted because light from the light emitting diode (LED) element 24 could be efficiently radiated forward and at a required angular distribution.
【００２８】次に、ダイマウンターを用いて、発光ダイ
オード(ＬＥＤ)素子24を回路基板23上の凹反射面25の逆
円錐台形の底面上に実装する。発光ダイオード(ＬＥＤ)
素子24としては、モノクロ画像読取用としてはＧaＰま
たは高輝度のものが必要な場合には４元素の例えばＡl
ＧaInＰ等の緑色のベアチップを用いる。また、カラー
画像読取用の線状照明装置の場合にはＲ(赤)，Ｇ(緑)，
Ｂ(青)の３色のＬＥＤチップを並べて実装すればよい。
このようにして光源部を作製する。Next, a light emitting diode (LED) element 24 is mounted on the inverted frustoconical bottom surface of the concave reflection surface 25 on the circuit board 23 using a die mounter. Light emitting diode (LED)
The element 24 has four elements, such as Al, when GaP or a high-brightness element is required for monochrome image reading.
A green bare chip such as GaInP is used. In the case of a linear illumination device for reading a color image, R (red), G (green),
What is necessary is just to mount LED chips of three colors of B (blue) side by side.
Thus, a light source unit is manufactured.
【００２９】次に、導光体21及びこれに設けられている
光屈折／反射領域22である多数の三角波面及び接続部26
及び他端部28に関しては、透明樹脂によるインジェクシ
ョン成形により一体で作製する。光屈折／反射領域22で
ある多数の三角波面は、導光体21の凹溝底面に形成され
る構成をとっている。透明樹脂の材料としては、透光
性，耐熱性，インジェクション成形時の樹脂の流れ性を
考慮すると、耐熱アクリル，ポリカーボネイト，非晶質
ポリオレフィン等が適している。さらに、接続部26及び
他端部28の外周には、透明シリコン樹脂にＴiＯ2を混ぜ
合わせた拡散材を塗布して光拡散層27及び光拡散層29を
形成する。この光拡散層27及び29に関しては、白色樹脂
で作製したキャップを差し込んで構成してもよい。次
に、他端面にＡlの蒸着またはディッピングで光反射層3
0を形成する。この光反射層に関しては、Ａl箔を透明接
着剤で貼付たＡlテープを貼付ることによって形成して
もよい。これで導光体部が完成する。Next, the light guide 21 and a number of triangular wavefronts and connection portions 26 which are the light refraction / reflection regions 22 provided therein.
The other end 28 is integrally formed by injection molding using a transparent resin. A large number of triangular wavefronts, which are the light refraction / reflection regions 22, are formed on the bottom surface of the concave groove of the light guide 21. As the material of the transparent resin, heat-resistant acryl, polycarbonate, amorphous polyolefin, and the like are suitable in consideration of light transmission, heat resistance, and resin flowability during injection molding. Further, a light diffusion layer 27 and a light diffusion layer 29 are formed on the outer periphery of the connection part 26 and the other end part 28 by applying a diffusion material obtained by mixing TiO 2 with transparent silicon resin. The light diffusion layers 27 and 29 may be configured by inserting a cap made of white resin. Next, the light reflecting layer 3 is formed on the other end surface by vapor deposition or dipping of Al.
Form a 0. The light reflecting layer may be formed by attaching an Al tape on which an Al foil is attached with a transparent adhesive. This completes the light guide.
【００３０】最後に、光源部と導光体部を、導光体材料
と同じ屈折率(約1.5)の透明樹脂を介して接続する。こ
の透明樹脂に関しては、エポキシ系や変性アクリレート
系のＵＶ硬化型樹脂を用いた。Finally, the light source unit and the light guide unit are connected via a transparent resin having the same refractive index (about 1.5) as the light guide material. As the transparent resin, an epoxy or modified acrylate UV curable resin was used.
【００３１】このようにして作製した本実施の形態２に
かかる線状照明装置の動作原理及び特性について図４を
参照しながら説明する。The operating principle and characteristics of the linear lighting device thus manufactured according to the second embodiment will be described with reference to FIG.
【００３２】図４は図３における線状照明装置の他端側
の側面断面図(a)の拡大図であり、光の進む様子を矢印
ｃで示したものである。FIG. 4 is an enlarged view of a side sectional view (a) of the other end side of the linear illumination device in FIG. 3, and shows the progress of light by an arrow c.
【００３３】次に動作を説明すると、発光ダイオード
(ＬＥＤ)素子24から放出された光のうち、発光角度が前
方に出射した光成分は直接接続部26に入射し、横方向に
出射した光成分は、凹反射面25で反射されて接続部26に
入射する。接続部26に入射した光のうち、直接導光体21
に入射した光成分は、すべて導光体21の側面で全反射を
繰り返しながら、いずれ光屈折／反射領域22に到達し、
ここで屈折または反射されることにより急激に角度を曲
げられ、これに対向する他側面から下方へと出射され原
稿面を照射する。接続部26から直接導光体21へ入射した
殆ど全ての光成分が導光体21の側面で全反射するよう
に、接続部26の径をＤ，接続部26の長さをＬ，接続部26
及び導光体21の屈折率をｎLGとすると、Next, the operation will be described.
(LED) Of the light emitted from the element 24, a light component emitted forward at an emission angle is directly incident on the connecting portion 26, and a light component emitted in the lateral direction is reflected by the concave reflection surface 25 to be connected to the connecting portion. It is incident on 26. Of the light incident on the connecting portion 26, the direct light guide 21
All the light components incident on the light guide 21 repeatedly reach the light refraction / reflection region 22 while repeating total reflection on the side surface of the light guide 21.
Here, the angle is sharply bent due to refraction or reflection, and the light is emitted downward from the other side opposite to the angle to irradiate the document surface. The diameter of the connecting portion 26 is L, the length of the connecting portion 26 is L, and the connecting portion is L so that almost all light components directly incident on the light guide 21 from the connecting portion 26 are totally reflected on the side surface of the light guide 21. 26
And the refractive index of the light guide 21 as nLG,
【００３４】[0034]
【数４】 Ｌ＞（Ｄ／２）ｔａｎ（ｓｉｎ~1(１／ｎLG)） なる条件を満たすように、各々ディメンジョンを決定し
ている。## EQU00004 ## The dimensions are determined so as to satisfy the condition of L> (D / 2) tan (sin- 1 (1 / nLG)).
【００３５】接続部26に入射した光のうち、この接続部
26の側面に到達する光成分は、光拡散層27により拡散さ
れ、その大部分を導光体21へ入射できるようにしてい
る。この導光体21へ入射した光成分は、同じく導光体21
の側面から直接出射するか、または何回か側面で全反射
を繰り返しながら光屈折／反射領域22に到達し、急激に
角度を曲げられ、導光体21から下方へ出射して原稿を照
明する。もしこの光拡散層27がなければ、光は接続部26
の側面から直接外側へ出射され、接続部26の直下での原
稿面の照度が著しく高くなり照度ばらつきが大きくなっ
てしまう。Of the light incident on the connection portion 26,
The light component reaching the side surface of the light diffusing layer 27 is diffused by the light diffusing layer 27 so that most of the light can enter the light guide 21. The light component incident on the light guide 21 is also the light guide 21
The light exits directly from the side surface, or reaches the light refraction / reflection region 22 while repeating total internal reflection several times, is sharply bent, and is emitted downward from the light guide 21 to illuminate the original. . If the light diffusion layer 27 is not provided, the light
The light is emitted directly from the side surface to the outside, and the illuminance on the document surface immediately below the connecting portion 26 is significantly increased, and the illuminance variation is increased.
【００３６】また、導光体21に入射した光成分のうち全
反射を繰り返して他端部28まで到達した光成分ｃ1は、
光反射層30で再度全反射された光成分ｃ2となって導光
体21に戻り再利用されるか、または光拡散層29で拡散さ
れて再利用されて、損失なく原稿面照射に利用される。The light component c 1 of the light component incident on the light guide 21 that has reached the other end 28 by repeating total reflection is:
The light component c 2 totally reflected again by the light reflection layer 30 is returned to the light guide 21 and reused, or is diffused and reused by the light diffusion layer 29, and is used for original surface irradiation without loss. Is done.
【００３７】このような動作原理に基づき、Ａ４サイズ
用の線状照明装置を作製しその特性を評価した。Based on such an operation principle, a linear illuminator for A4 size was manufactured and its characteristics were evaluated.
【００３８】これにより、ＬＥＤ素子(ＧaＰ、λ＝565n
m)が３素子で、原稿面照度280lux、照度ばらつき約10％
を実現した。これを従来のＬＥＤアレイと比較すると、
ＬＥＤ素子数を約１／８に削減することができ、また照
明装置から原稿面までの距離では、従来ＬＥＤアレイが
約８〜10mm程度必要であったのが、本線状照明装置では
1.5mmに近づけても充分照度ばらつきを抑えることがで
きた。これにより、60％の低コスト化を実現できるとと
もに本線状照明装置を搭載した画像読取装置ではそのサ
イズを約半分にすることができた。Thus, the LED element (GaP, λ = 565n)
m) consists of 3 elements, the original surface illuminance 280lux, illuminance variation about 10%
Was realized. Comparing this with a conventional LED array,
The number of LED elements can be reduced to about 1/8, and the distance from the illuminating device to the document surface required about 8 to 10 mm for the conventional LED array.
Even when approaching 1.5 mm, the illuminance variation was sufficiently suppressed. As a result, the cost can be reduced by 60%, and the size of the image reading apparatus equipped with the linear illumination device can be reduced to about half.
【００３９】[0039]
【発明の効果】以上説明したように本発明によれば、原
稿面への照度効率が高く照度ばらつきが小さい線状照明
装置を可能とし、低コストで、高品質、高分解能で画像
を読み取れる小型・軽量の光学的画像読取装置を実現す
ることができる。As described above, according to the present invention, it is possible to provide a linear illuminator having high illuminance efficiency on a document surface and small illuminance variation, and capable of reading an image at low cost with high quality and high resolution. -A light-weight optical image reading device can be realized.
【図１】本発明の実施の形態１における線状照明装置の
構成図である。FIG. 1 is a configuration diagram of a linear lighting device according to a first embodiment of the present invention.
【図２】図１における線状照明装置の側面断面図(a)の
拡大図である。FIG. 2 is an enlarged view of a side sectional view (a) of the linear lighting device in FIG. 1;
【図３】本発明の実施の形態２における線状照明装置の
構成図である。FIG. 3 is a configuration diagram of a linear lighting device according to a second embodiment of the present invention.
【図４】図３における線状照明装置の他端側の側面断面
図(a)の拡大図である。4 is an enlarged view of a side sectional view (a) of the other end side of the linear lighting device in FIG. 3;
【図５】従来の光学的画像読取装置の構造を示した外観
斜視図である。FIG. 5 is an external perspective view showing the structure of a conventional optical image reading device.
【図６】従来のＬＥＤアレイの構成図である。FIG. 6 is a configuration diagram of a conventional LED array.
１，21…導光体、 ２，22…光屈折／反射領域、 ３，
23…回路基板、 ４，24…発光ダイオード(ＬＥＤ)素
子、 ５，25…凹反射面、 ６，26…接続部、 ７，2
7，29…光拡散層、 28…他端部、 30…光反射層。1,21 ... light guide, 2,22 ... light refraction / reflection area, 3,
23 ... Circuit board, 4,24 ... Light emitting diode (LED) element, 5,25 ... Concave reflection surface, 6,26 ... Connection part, 7,2
7, 29: light diffusion layer, 28: other end, 30: light reflection layer.
Claims (47)
体の長手方向の一側表面に設けた光屈折及びまたは反射
領域と、前記導光体の両端部表面に光源とを備え、前記
光源から放出された光を導光体内部に入射させ、前記光
屈折及びまたは反射領域で屈折及びまたは反射した光
が、前記導光体の前記光屈折及びまたは反射領域に対向
する長手方向の他一側表面から外部に出射させ線状を照
明する線状照明装置において、前記光屈折及びまたは反
射領域を多数の三角波状の屈折／反射面で形成したこと
を特徴とする線状照明装置。1. A light guide made of a translucent material, a light refraction and / or reflection region provided on one longitudinal surface of the light guide, and light sources on both end surfaces of the light guide. The light emitted from the light source is made incident on the inside of the light guide, and the light refracted and / or reflected in the light refraction and / or reflection region is a longitudinal portion of the light guide that faces the light refraction and / or reflection region. A linear illumination device for illuminating a linear shape by emitting light from the other side surface to the outside, wherein the light refraction and / or reflection region is formed by a number of triangular refraction / reflection surfaces. apparatus.
両端面に平行な断面の断面積が次第に小さくなり、中央
部において最小断面積となるように形成したことを特徴
とする請求項１記載の線状照明装置。2. The light guide according to claim 1, wherein a cross-sectional area of a cross section parallel to both end faces is gradually reduced from both ends toward a center, and the light guide is formed to have a minimum cross-sectional area at a central portion. 2. The linear lighting device according to 1.
状が全ての切断面において全て相似形であることを特徴
とする請求項１または２記載の線状照明装置。3. The linear lighting device according to claim 1, wherein the shapes of the cut surfaces parallel to both end surfaces of the light guide are all similar in all the cut surfaces.
実質的に円であることを特徴とする請求項３記載の線状
照明装置。4. The linear lighting device according to claim 3, wherein a shape of a cross section parallel to an end surface of the light guide is substantially a circle.
端面に対して垂直な面であることを特徴とする請求項３
記載の線状照明装置。5. The light guide according to claim 3, wherein a longitudinal direction in which light is emitted is a plane perpendicular to both end faces.
The linear lighting device as described in the above.
円の円周の光屈折及びまたは反射領域に対向する一点が
両端面に垂直な１直線に並ぶことを特徴とする請求項４
記載の線状照明装置。6. A point which faces a light refraction and / or reflection area of a circumference of each circle which is a cross section parallel to an end face of the light guide is aligned with one straight line perpendicular to both end faces. 4
The linear lighting device as described in the above.
距離だけ光屈折及びまたは反射面がない構造を有するこ
とを特徴とする請求項４，５または６記載の線状照明装
置。7. The linear illuminating device according to claim 4, wherein the linear illuminating device has a structure in which there is no light refraction and / or reflection surface for a certain distance in the longitudinal direction from both end surfaces of the light guide.
両端面から長手方向へ一定距離だけ同形状な構造である
ことを特徴とする請求項４，５または６記載の線状照明
装置。8. The linear illumination according to claim 4, wherein a cross-sectional shape parallel to both end faces of the light guide has the same shape from the both end faces by a certain distance in the longitudinal direction. apparatus.
両端面から長手方向へ一定距離だけ同形状であり、かつ
光屈折及びまたは反射領域がない光源との接続部をもつ
構造であることを特徴とする請求項４，５または６記載
の線状照明装置。9. The light guide has a structure in which a cross section parallel to both end faces is the same shape in the longitudinal direction from both end faces for a certain distance, and has a connection portion with a light source having no light refraction and / or reflection area. 7. The linear lighting device according to claim 4, wherein the linear lighting device is provided.
長手方向全体にわたって一定であることを特徴とする請
求項４，５または６記載の線状照明装置。10. The linear lighting device according to claim 4, wherein the width of the light refraction and / or reflection region is constant over the entire longitudinal direction.
記導光体の長手方向の一側面に凹溝を形成し、その凹溝
底面に形成することを特徴とする請求項４，５または６
記載の線状照明装置。11. The light refraction and / or reflection area is formed with a groove on one side surface of the light guide in the longitudinal direction, and formed on the bottom surface of the groove.
The linear lighting device as described in the above.
導光体の長手方向の一側表面に所定の分布で形成するこ
とを特徴とする請求項４，５または６記載の線状照明装
置。12. The linear lighting device according to claim 4, wherein the light refraction and / or reflection regions are formed in a predetermined distribution on one longitudinal surface of the light guide.
周に遮光層を設けたことを特徴とする請求項９記載の線
状照明装置。13. The linear lighting device according to claim 9, wherein a light shielding layer is provided on an outer periphery of a connection portion of the light guide with the light source.
周に光拡散層を設けたことを特徴とする請求項９記載の
線状照明装置。14. The linear lighting device according to claim 9, wherein a light diffusion layer is provided on an outer periphery of a connection portion of the light guide with the light source.
周に光反射層を設けたことを特徴とする請求項９記載の
線状照明装置。15. The linear lighting device according to claim 9, wherein a light reflection layer is provided on an outer periphery of a connection portion of the light guide with the light source.
をＤ，長さをＬ，上記導光体の屈折率をｎLGとしたと
き、 【数１】 Ｌ＞（Ｄ／２）ｔａｎ（ｓｉｎ~1(１／ｎLG)） なる条件を満足することを特徴とする請求項13，14また
は15記載の線状照明装置。16. When the diameter of the connection portion of the light guide with the light source is D, the length is L, and the refractive index of the light guide is nLG, L> (D / 2) 16. The linear lighting device according to claim 13, which satisfies a condition of tan (sin ~ 1 (1 / nLG)).
たことを特徴とする請求項１記載の線状照明装置。17. The linear lighting device according to claim 1, wherein a light emitting diode is used as the light source.
形成された凹反射面に実装されることを特徴とする請求
項17記載の線状照明装置。18. The linear lighting device according to claim 17, wherein the light emitting diode is mounted on a concave reflection surface formed on a circuit board.
あり、上記発光ダイオードは上記逆円錐台形の底面に実
装されることを特徴とする請求項18記載の線状照明装
置。19. The linear lighting device according to claim 18, wherein the shape of the concave reflecting surface is an inverted truncated cone, and the light emitting diode is mounted on a bottom surface of the inverted truncated cone.
上記導光体と同じ屈折率を持つ透明樹脂で光学的マッチ
ングをとって接続したことを特徴とする請求項19記載の
線状照明装置。20. The light emitting diode and the light guide,
20. The linear lighting device according to claim 19, wherein the linear lighting device is connected by optical matching with a transparent resin having the same refractive index as the light guide.
光体の長手方向の一側表面に設けた光屈折及びまたは反
射領域と、前記導光体の一端部表面に光源とを備え、前
記光源から放出された光を導光体内部に入射させ、前記
光屈折及びまたは反射領域で屈折及びまたは反射した光
が、前記導光体の前記光屈折及びまたは反射領域に対向
する長手方向の他一側表面から外部に出射させ線状を照
明する線状照明装置において、前記光屈折及びまたは反
射領域を多数の三角波状の屈折／反射面で形成したこと
を特徴とする線状照明装置。21. A light guide made of a translucent material, a light refraction and / or reflection region provided on one longitudinal surface of the light guide, and a light source on one end surface of the light guide. The light emitted from the light source is made incident on the inside of the light guide, and the light refracted and / or reflected in the light refraction and / or reflection region is a longitudinal portion of the light guide that faces the light refraction and / or reflection region. A linear illumination device for illuminating a linear shape by emitting light from the other side surface to the outside, wherein the light refraction and / or reflection region is formed by a number of triangular refraction / reflection surfaces. apparatus.
一端面から他端面に向かって、端面に平行な断面の断面
積が次第に小さくなり、他端面において最小断面積とな
るように形成したことを特徴とする請求項21記載の線状
照明装置。22. The light guide is formed such that a cross-sectional area of a cross section parallel to the end face gradually decreases from one end face where the light source is disposed to the other end face, and has a minimum cross-sectional area at the other end face. 22. The linear lighting device according to claim 21, wherein
端面に平行な切断面の形状が全ての切断面において全て
相似形であることを特徴とする請求項21または22記載の
線状照明装置。23. The linear shape according to claim 21, wherein the shape of the cut surface of the light guide parallel to one end face on which the light source is arranged is similar in all cut surfaces. Lighting equipment.
端面に平行な断面の形状が実質的に円であることを特徴
とする請求項21または22記載の線状照明装置。24. The linear lighting device according to claim 21, wherein a cross-section of the light guide parallel to one end face on which the light source is disposed is substantially circular.
一側面が上記光源が配置された一端面に対して垂直な面
であることを特徴とする請求項23記載の線状照明装置。25. The linear lighting device according to claim 23, wherein one side surface of the light guide in the longitudinal direction from which light is emitted is a surface perpendicular to one end surface on which the light source is disposed. .
端面に平行な断面である各円の円周の光屈折及びまたは
反射領域に対向する一点が上記一端面に垂直な１直線に
並ぶことを特徴とする請求項24記載の線状照明装置。26. One point of the light guide opposing the light refraction and / or reflection area of the circumference of each circle having a cross section parallel to one end face on which the light source is disposed is a straight line perpendicular to the one end face. 25. The linear lighting device according to claim 24, wherein the linear lighting device is arranged.
端面から長手方向へ一定距離だけ光屈折及びまたは反射
面がない構造を有することを特徴とする請求項24，25ま
たは26記載の線状照明装置。27. The light guide according to claim 24, wherein the light guide has a structure in which there is no light refraction and / or reflection surface for a certain distance in the longitudinal direction from one end face on which the light source is arranged. Linear lighting device.
端面に平行な断面形状が上記一端面から長手方向へ一定
距離だけ同形状な構造であることを特徴とする請求項2
4，25または26記載の線状照明装置。28. The light guide according to claim 2, wherein a cross-sectional shape of the light guide parallel to one end face on which the light source is arranged has the same shape from the one end face by a certain distance in a longitudinal direction.
27. The linear lighting device according to 4, 25 or 26.
端面に平行な断面形状が上記一端面から長手方向へ一定
距離だけ同形状であり、かつ光屈折及びまたは反射領域
がない光源との接続部をもつ構造であることを特徴とす
る請求項24，25または26記載の線状照明装置。29. A light source in which the light guide has a cross-sectional shape parallel to one end face on which the light source is arranged, the cross-sectional shape being the same as a certain distance in the longitudinal direction from the one end face, and having no light refraction and / or reflection area. 27. The linear lighting device according to claim 24, wherein the linear lighting device has a structure having a connecting portion.
長手方向全体にわたって一定であることを特徴とする請
求項24，25または26記載の線状照明装置。30. The linear lighting device according to claim 24, wherein the width of the light refraction and / or reflection region is constant over the entire longitudinal direction.
記導光体の長手方向の一側面に凹溝を形成し、その底面
に形成することを特徴とする請求項24，25または26記載
の線状照明装置。31. The light guide according to claim 24, 25 or 26, wherein the light refraction and / or reflection region is formed on one side surface of the light guide in the longitudinal direction and formed on the bottom surface thereof. Linear lighting device.
導光体の長手方向の一側表面に所定の分布で形成するこ
とを特徴とする請求項24，25または26記載の線状照明装
置。32. The linear lighting device according to claim 24, wherein the light refraction and / or reflection region is formed in a predetermined distribution on one surface in a longitudinal direction of the light guide.
周に遮光層を設けたことを特徴とする請求項29記載の線
状照明装置。33. The linear lighting device according to claim 29, wherein a light shielding layer is provided on an outer periphery of a connection portion of the light guide with the light source.
周に光拡散層を設けたことを特徴とする請求項29記載の
線状照明装置。34. The linear lighting device according to claim 29, wherein a light diffusion layer is provided on an outer periphery of a connection portion of the light guide with the light source.
周に光反射層を設けたことを特徴とする請求項29記載の
線状照明装置。35. The linear lighting device according to claim 29, wherein a light reflection layer is provided on an outer periphery of a connection portion of the light guide with the light source.
をＤ，長さをＬ，上記導光体の屈折率をｎLGとしたと
き、 【数２】 Ｌ＞（Ｄ／２）ｔａｎ（ｓｉｎ~1(１／ｎLG)） なる条件を満足することを特徴とする請求項33，34また
は35記載の線状照明装置。36. When the diameter of the connection portion of the light guide with the light source is D, the length is L, and the refractive index of the light guide is nLG, L> (D / 2) The linear lighting device according to claim 33, 34 or 35, wherein a condition of tan (sin ~ 1 (1 / nLG)) is satisfied.
他端面から長手方向へ一定距離だけ光屈折及びまたは反
射面がない構造を有すること特徴とする請求項24，25ま
たは26記載の線状照明装置。37. The linear shape according to claim 24, wherein the light guide has a structure in which there is no light refraction and / or reflection surface for a certain distance in the longitudinal direction from the other end surface of the light guide where the light source is not disposed. Lighting equipment.
他端面に平行な断面形状が上記他端面から長手方向へ一
定距離だけ同形状な構造を有すること特徴とする請求項
24，25または25記載の線状照明装置。38. The light guide body, wherein a cross-sectional shape parallel to the other end face on which the light source is not disposed has the same structure as a certain distance in the longitudinal direction from the other end face.
24. The linear lighting device according to 24, 25 or 25.
他端面に平行な断面形状が上記他端面から長手方向へ一
定距離だけ同形状であり、かつ光屈折及びまたは反射領
域がない他端部分を持つ構造を有すること特徴とする請
求項24，25または26記載の線状照明装置。39. The other end portion of the light guide, the cross-sectional shape of which is parallel to the other end surface on which the light source is not arranged is the same shape in the longitudinal direction from the other end surface for a certain distance, and has no light refraction and / or reflection area. 27. The linear lighting device according to claim 24, wherein the linear lighting device has a structure having:
光層を設けたことを特徴とする請求項39記載の線状照明
装置。40. The linear lighting device according to claim 39, wherein a light shielding layer is provided on an outer periphery of the other end portion of the light guide.
拡散層を設けたことを特徴とする請求項39記載の線状照
明装置。41. The linear lighting device according to claim 39, wherein a light diffusion layer is provided on an outer periphery of the other end portion of the light guide.
反射層を設けたことを特徴とする請求項39記載の線状照
明装置。42. The linear lighting device according to claim 39, wherein a light reflecting layer is provided on an outer periphery of the other end portion of the light guide.
他端面に遮光層または光拡散層または光反射層を設けた
ことを特徴とする請求項24，25または26記載の線状照明
装置。43. The linear lighting device according to claim 24, wherein a light-shielding layer, a light-diffusing layer, or a light-reflecting layer is provided on the other end of the light guide where the light source is not arranged.
たことを特徴とする請求項21記載の線状照明装置。44. The linear lighting device according to claim 21, wherein a light emitting diode is used as the light source.
形成された凹反射面に実装されることを特徴とする請求
項44記載の線状照明装置。45. The linear lighting device according to claim 44, wherein the light emitting diode is mounted on a concave reflection surface formed on a circuit board.
あり、上記発光ダイオードは上記逆円錐台形の底面に実
装されることを特徴とする請求項45記載の線状照明装
置。46. The linear lighting device according to claim 45, wherein the shape of the concave reflecting surface is an inverted truncated cone, and the light emitting diode is mounted on a bottom surface of the inverted truncated cone.
上記導光体と同じ屈折率を持つ透明樹脂で光学的マッチ
ングをとって接続したことを特徴とする請求項46記載の
線状照明装置。47. The light emitting diode and the light guide,
47. The linear illuminating device according to claim 46, wherein the linear illuminating device is connected by optical matching with a transparent resin having the same refractive index as the light guide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30648196A JP3792807B2 (en) | 1996-11-18 | 1996-11-18 | Linear lighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30648196A JP3792807B2 (en) | 1996-11-18 | 1996-11-18 | Linear lighting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10150526A true JPH10150526A (en) | 1998-06-02 |
| JP3792807B2 JP3792807B2 (en) | 2006-07-05 |
Family
ID=17957545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30648196A Expired - Lifetime JP3792807B2 (en) | 1996-11-18 | 1996-11-18 | Linear lighting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3792807B2 (en) |
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|---|---|---|---|---|
| WO2007099838A1 (en) * | 2006-02-23 | 2007-09-07 | Rohm Co., Ltd. | Linear light source device, and image reading device and planar display device using the linear light source device |
| JP2007300536A (en) * | 2006-05-02 | 2007-11-15 | Rohm Co Ltd | Image reader and manufacturing method therefor |
| KR100817652B1 (en) | 2002-10-25 | 2008-03-27 | 샤프 가부시키가이샤 | Light source and display device having the same |
| US7498559B2 (en) | 2004-09-22 | 2009-03-03 | Sharp Kabushiki Kaisha | Optical discharge apparatus and image forming apparatus containing the same |
| JP2010011249A (en) * | 2008-06-30 | 2010-01-14 | Rohm Co Ltd | Light guide and image sensor module |
| WO2010049912A2 (en) * | 2008-10-31 | 2010-05-06 | Udayan Kanade | A light source with light recovery mechanism |
| JP2011139239A (en) * | 2009-12-28 | 2011-07-14 | Kyocera Mita Corp | Image reading apparatus and image formation apparatus |
| US8749855B2 (en) | 2009-12-28 | 2014-06-10 | Kyocera Document Solutions Inc. | Copy machine with elliptical diffusion plates |
| US11729332B2 (en) | 2020-11-25 | 2023-08-15 | Pfu Limited | Light source unit in which surface opposite to light emitting element of light guide is not covered and medium side surface of reflector protrudes from light guide |
-
1996
- 1996-11-18 JP JP30648196A patent/JP3792807B2/en not_active Expired - Lifetime
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100817652B1 (en) | 2002-10-25 | 2008-03-27 | 샤프 가부시키가이샤 | Light source and display device having the same |
| US7498559B2 (en) | 2004-09-22 | 2009-03-03 | Sharp Kabushiki Kaisha | Optical discharge apparatus and image forming apparatus containing the same |
| WO2007099838A1 (en) * | 2006-02-23 | 2007-09-07 | Rohm Co., Ltd. | Linear light source device, and image reading device and planar display device using the linear light source device |
| US8240902B2 (en) | 2006-02-23 | 2012-08-14 | Rohm Co., Ltd. | LED linear light source and devices using such source |
| JP2007300536A (en) * | 2006-05-02 | 2007-11-15 | Rohm Co Ltd | Image reader and manufacturing method therefor |
| JP2010011249A (en) * | 2008-06-30 | 2010-01-14 | Rohm Co Ltd | Light guide and image sensor module |
| WO2010049912A2 (en) * | 2008-10-31 | 2010-05-06 | Udayan Kanade | A light source with light recovery mechanism |
| WO2010049912A3 (en) * | 2008-10-31 | 2011-07-07 | Udayan Kanade | A light source with light recovery mechanism |
| JP2011139239A (en) * | 2009-12-28 | 2011-07-14 | Kyocera Mita Corp | Image reading apparatus and image formation apparatus |
| US8749855B2 (en) | 2009-12-28 | 2014-06-10 | Kyocera Document Solutions Inc. | Copy machine with elliptical diffusion plates |
| US11729332B2 (en) | 2020-11-25 | 2023-08-15 | Pfu Limited | Light source unit in which surface opposite to light emitting element of light guide is not covered and medium side surface of reflector protrudes from light guide |
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| Publication number | Publication date |
|---|---|
| JP3792807B2 (en) | 2006-07-05 |
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