JPH07193675A - Reader - Google Patents

Reader

Info

Publication number
JPH07193675A
JPH07193675A JP5329176A JP32917693A JPH07193675A JP H07193675 A JPH07193675 A JP H07193675A JP 5329176 A JP5329176 A JP 5329176A JP 32917693 A JP32917693 A JP 32917693A JP H07193675 A JPH07193675 A JP H07193675A
Authority
JP
Japan
Prior art keywords
light
original
light guide
leds
lens
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5329176A
Other languages
Japanese (ja)
Inventor
Hiroyuki Okushiba
浩之 奥芝
Yoshinori Morita
啓徳 森田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Corp
Original Assignee
Kyocera Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Corp filed Critical Kyocera Corp
Priority to JP5329176A priority Critical patent/JPH07193675A/en
Publication of JPH07193675A publication Critical patent/JPH07193675A/en
Pending legal-status Critical Current

Links

Landscapes

  • Facsimile Heads (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

PURPOSE:To provide the reader whose cost is reduced by decreasing number of LEDs used for a light source in which the luminous quantity of light lighting an original is uniformized. CONSTITUTION:The reader 15 is made up of a light source device 1 comprising an optical delivery member 9 and a couple of LEDs 5, plural lenses 11, plural sensor ICs 13 whose number is equal to the number of the lenses 11, and a case 12 containing the optical delivery member 9 and the lenses 11 or the like. The optical delivery member 9 is made up of a long light guide section 3 and plural prisms 4 arranged to a bottom of the light guide section 3, and a cylindrical lens section 6 is provided to an upper face of the light guide section 3. A light 7 emitted from the LEDs 5 arranged to both sides of both ends of the optical delivery member 9 is made incident onto the optical delivery member 9 from both end faces of the light guide section 3 and reflected in the plural prisms 4 and its optical path is diverted into a direction of an original 2 and the light is collected in the subscanning direction through the cylindrical lens section 6 and the collected light lights up the original 2 uniformly via a protection glass 10.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、ファクシミリなどに用
いられる読取装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reading device used for a facsimile or the like.

【0002】[0002]

【従来の技術】読取装置は、大略的にはLED(発光ダ
イオード)などの光源によって原稿を照明し、原稿から
の反射光をレンズなどの光学系によってセンサIC(集
積回路)およびCCD(チャージカップルドデバイス、
電荷転送デバイス)などの受光素子上に結像するように
構成されており、一般的に従来の読取装置では、光源に
は原稿の幅方向(主走査方向)に沿って複数個のLED
が原稿を直接照射するように設置されて用いられる。
2. Description of the Related Art Generally, a reader illuminates an original with a light source such as an LED (light emitting diode), and reflects light from the original with a sensor IC (integrated circuit) and a CCD (charge couple) by an optical system such as a lens. Device,
An image is formed on a light receiving element such as a charge transfer device. Generally, in a conventional reading device, a plurality of LEDs are used as a light source in the width direction (main scanning direction) of the document.
Is used so that the original is directly illuminated.

【0003】このように構成される読取装置では、光源
に使用するLEDの数を減らすと、受光素子上に結像さ
れる像が暗くなってしまうために、LEDの数を減らす
ことができず、コストの低減が困難であるという問題が
ある。
In the reading apparatus having such a structure, if the number of LEDs used as the light source is reduced, the image formed on the light receiving element becomes dark, so that the number of LEDs cannot be reduced. However, there is a problem that it is difficult to reduce the cost.

【0004】一方、複数個のLEDを直線状に並べて光
源として使用し、原稿を照明する場合、図8(1)に示
されるように、原稿面からの反射光の光量は、LEDの
近傍と、LEDとLEDとの間とでは、約15%ほどの
差があり、光量にムラが生じるという問題がある。
On the other hand, when a plurality of LEDs are linearly arranged and used as a light source to illuminate a document, as shown in FIG. 8 (1), the amount of light reflected from the document surface is in the vicinity of the LEDs. There is a difference of about 15% between the LED and the LED, and there is a problem that the light amount becomes uneven.

【0005】前述のLEDを減らすと像が暗くなるとい
う問題に対して、特開平5−199368が提案されて
いる。この従来技術において、LEDチップアレイを集
光レンズが備えられたケースに挿入し、LEDから発せ
られる光が原稿面の副走査方向に広がりすぎるのを防
ぎ、読取るべき原稿面の読取位置を照明する光の光量を
増加することによって、使用するLEDの個数を減ら
し、コストの低減などを図っている。
Japanese Patent Laid-Open No. 5-199368 has been proposed to solve the problem that the image becomes dark when the number of LEDs is reduced. In this prior art, the LED chip array is inserted into a case provided with a condenser lens to prevent the light emitted from the LED from spreading too much in the sub-scanning direction of the document surface and illuminate the reading position of the document surface to be read. By increasing the amount of light, the number of LEDs used is reduced and the cost is reduced.

【0006】また、LEDを並べて配置すると、原稿か
らの反射光の光量にムラが生じるという問題に対して、
特開平5−227367が提案されている。この従来技
術において、密着型の読取装置に関し、原稿が移送され
る透光板のLEDアレイ側の面に凹凸部を、LEDの配
列方向に沿って設けることによって、光量のムラの補正
を行っている。
Further, when the LEDs are arranged side by side, the problem that the amount of light reflected from the original becomes uneven is solved.
Japanese Unexamined Patent Publication No. 5-227367 has been proposed. In this prior art, regarding the contact type reading device, unevenness of the light amount is corrected by providing an uneven portion on the LED array side surface of the translucent plate on which the document is transferred along the LED array direction. There is.

【0007】さらにまた、従来の密着型の読取装置にお
いて、原稿の走査方向に沿って複数個のレンズおよび受
光素子を1対1に対応させて配設し、原稿像をいくつか
のブロックに分割して読取りを行う場合、原稿からの反
射光がレンズを通過する際、図8(2)に示されるよう
に、光路がレンズの周辺を通るほど、レンズを通過する
前記反射光の光量が減り、光路がレンズの中央部を通る
場合と、周辺部を通る場合とでは、通過光量に約15%
ほどの差が生じる。この場合、LEDをレンズとレンズ
との各中間と、両端のレンズの両外側とに設置すること
によって、図8(1)に示されるような前記原稿面から
の反射光の光量のムラと、図8(2)に示されるような
前記反射光がレンズを通過する際に生じる通過光量のム
ラとが打ち消し合い、各受光素子上に結像される光の光
量が均一化されて、図8(3)に示されるように、各受
光素子から、像のパターンに対応したほぼ均一な信号出
力が得られるようになっている。
Furthermore, in the conventional contact type reading apparatus, a plurality of lenses and light receiving elements are arranged in a one-to-one correspondence along the scanning direction of the original, and the original image is divided into several blocks. When the reflected light from the original passes through the lens when performing reading, the amount of the reflected light passing through the lens decreases as the optical path passes around the lens, as shown in FIG. 8B. Approximately 15% in the amount of light passing when the optical path passes through the central part of the lens and when passing through the peripheral part.
There is a big difference. In this case, by disposing the LEDs on the respective middles of the lenses and on both outer sides of the lenses at both ends, the unevenness of the light amount of the reflected light from the document surface as shown in FIG. 8 (1), As shown in FIG. 8 (2), the unevenness of the amount of passing light generated when the reflected light passes through the lens cancels each other out, and the amount of light imaged on each light receiving element is made uniform, so that As shown in (3), each light receiving element can obtain a substantially uniform signal output corresponding to the image pattern.

【0008】[0008]

【発明が解決しようとする課題】いずれの従来技術にお
いても、複数個のLEDを並べて使用するために、依然
としてLED毎の光量差などによって、原稿からの反射
光の光量にばらつきが生じ易いという課題がある。ま
た、LEDをレンズとレンズとの間に配設すると、LE
Dは常に使用するレンズの数よりも1つ多い数だけ用い
るために、使用するLEDの数を減らすことができず、
コストの低減が困難であるという課題がある。
In any of the prior arts, since a plurality of LEDs are used side by side, the light quantity of the reflected light from the document still tends to vary due to the light quantity difference between the LEDs. There is. Further, if the LED is arranged between the lenses, the LE
D is always one more than the number of lenses used, so the number of LEDs used cannot be reduced,
There is a problem that it is difficult to reduce the cost.

【0009】本発明の目的は、光源に使用するLEDの
数を減らしてコストの低減ができ、かつ原稿を照明する
光の光量を均一化することができる読取装置を提供する
ことである。
An object of the present invention is to provide a reading device which can reduce the number of LEDs used as a light source to reduce the cost and can make the light amount of light for illuminating a document uniform.

【0010】[0010]

【課題を解決するための手段】本発明は、原稿と接触す
る透光板と、原稿を照明する光源装置と、原稿からの反
射光を結像するレンズと、前記レンズが結像した像を光
電変換する受光素子と、前記透光板、光源装置、レン
ズ、および受光素子を保持する筺体とを備える読取装置
において、前記光源装置が、光源と、前記光源からの光
を導く導光部材と、前記導光部材を通過した光を原稿側
に反射する複数個のプリズムとを具備することを特徴と
する読取装置である。
According to the present invention, a light-transmitting plate that comes into contact with an original, a light source device that illuminates the original, a lens that forms reflected light from the original, and an image formed by the lens are provided. In a reading device including a light receiving element that performs photoelectric conversion, the translucent plate, a light source device, a lens, and a housing that holds the light receiving element, the light source device includes a light source, and a light guide member that guides light from the light source. And a plurality of prisms that reflect the light passing through the light guide member toward the original.

【0011】[0011]

【作用】本発明に従えば、読取装置は、筺体の上面には
原稿と接触する透光板が取付けられ、筺体内部には、光
源装置と、レンズと、受光素子などとを備えて構成され
る。前記光源装置は、導光部材と、複数個のプリズム
と、光源とから構成される。導光部材は、たとえば原稿
幅とほぼ同一の長さの長尺状の形状を有し、原稿の主走
査方向に沿って、原稿の読取面の下方に透光板を介して
筺体内部に設置される。複数のプリズムは、前記導光部
材の長手方向に沿って、たとえば導光部材の底面に配設
される。LEDなどの光源は、たとえば導光部材の両端
部の両側に、設置されており、光源から発せられる光
は、導光部材へ入射し、導光部材の下面などに配設され
ている複数個のプリズムによって反射され、光路の向き
を原稿への方向へ変えられ、導光部材の上面から出射
し、透光板を介して原稿面を照明する。
According to the present invention, the reading device is constructed such that a light-transmitting plate that comes into contact with an original is attached to the upper surface of the housing, and the light source device, the lens, and the light receiving element are provided inside the housing. It The light source device includes a light guide member, a plurality of prisms, and a light source. The light guide member has, for example, an elongated shape having a length substantially the same as the width of the document, and is installed inside the housing below the reading surface of the document through a translucent plate along the main scanning direction of the document. To be done. The plurality of prisms are arranged along the longitudinal direction of the light guide member, for example, on the bottom surface of the light guide member. Light sources such as LEDs are installed, for example, on both sides of both ends of the light guide member, and light emitted from the light source enters the light guide member and is arranged on the lower surface of the light guide member. The light is reflected by the prism, the direction of the optical path is changed to the direction of the original, the light is emitted from the upper surface of the light guide member, and the original surface is illuminated through the light transmitting plate.

【0012】原稿面からの反射光は、再び透光板を介
し、筺体内へ入射し、レンズに入射し、センサICなど
の受光素子面上に結像し、受光素子によって光電変換さ
れて読取られる。
The reflected light from the document surface again enters the housing through the translucent plate, enters the lens, forms an image on the light receiving element surface of the sensor IC or the like, is photoelectrically converted by the light receiving element, and is read. To be

【0013】したがって、従来のような個々のLEDの
光量のばらつきによる照明光量のばらつきが解消され、
原稿を均一に照明することができる。また、光源に用い
るLEDは、たとえば導光部材の両側に1つずつ配設す
ればよいために、部品コストを低減することができる。
Therefore, the variation in the illumination light amount due to the variation in the light amount of each LED as in the conventional art is eliminated,
The original can be illuminated uniformly. Further, since the LEDs used for the light source may be provided, for example, one on each side of the light guide member, the cost of parts can be reduced.

【0014】[0014]

【実施例】図1は、本発明である読取装置に適用される
光源装置1の構成図である。光源装置1は、原稿2の主
走査方向に沿って設置される長尺状の導光部3と導光部
3の底面などに設けられる複数個のプリズム4とから成
る光伝達部材9と、たとえば導光部3の両端部の両側に
設置されるLED5とを備えて構成される。導光部3の
上面には、シリンドリカルレンズ部6が設けられる。ま
た、導光部3とプリズム4とは、ガラス、PMMA(ポ
リメタクリル酸メチル)、または結晶ポリマなどによっ
て一体成形されてもよい。
1 is a block diagram of a light source device 1 applied to a reading device according to the present invention. The light source device 1 includes a light transmitting member 9 including an elongated light guide portion 3 installed along the main scanning direction of the original 2 and a plurality of prisms 4 provided on the bottom surface of the light guide portion 3 and the like. For example, it is configured to include LEDs 5 installed on both sides of both ends of the light guide unit 3. A cylindrical lens portion 6 is provided on the upper surface of the light guide portion 3. Further, the light guide portion 3 and the prism 4 may be integrally formed of glass, PMMA (polymethylmethacrylate), crystalline polymer or the like.

【0015】LED5から発せられた光7は、導光部3
の両端面から導光部3内部へ入射し、底面などに設けら
れる複数個のプリズム4の反射面8で反射して光路を原
稿2方向へ変えられ、上面に設けられるシリンドリカル
レンズ部6を介し、原稿2の副走査方向に対して集光さ
れて、原稿2を照明する。シリンドリカルレンズ部6の
形状を、たとえば非球面形状にし、原稿2を照明する光
の集光特性を向上させてもよい。プリズム4の反射面8
は、角度を適当に調節することによって光7を全反射す
るようにしてもよいし、またはアルミなどの金属膜を蒸
着させて形成してもよい。
The light 7 emitted from the LED 5 is guided by the light guide portion 3.
From both end surfaces into the light guide portion 3 and is reflected by the reflecting surfaces 8 of the plurality of prisms 4 provided on the bottom surface or the like to change the optical path to the original 2 direction, and through the cylindrical lens portion 6 provided on the upper surface. The document 2 is condensed in the sub-scanning direction to illuminate the document 2. The shape of the cylindrical lens portion 6 may be, for example, an aspherical shape to improve the condensing characteristic of the light that illuminates the document 2. Reflective surface 8 of prism 4
The light may be totally reflected by adjusting the angle appropriately, or may be formed by vapor-depositing a metal film such as aluminum.

【0016】図2は本発明の一実施例の読取装置15の
構成を示す断面図であり、図3は読取装置15の概略斜
視図である。図4は読取装置15に備えられる光伝達部
材9の外観図であり、図4(1)は側面図であり、図4
(2)は正面図であり、図4(3)は底面図である。図
2,図3,および図4において、図1と対応する部分に
は同一の参照符号を付す。
FIG. 2 is a sectional view showing the construction of the reading device 15 according to one embodiment of the present invention, and FIG. 3 is a schematic perspective view of the reading device 15. FIG. 4 is an external view of the light transmission member 9 provided in the reading device 15, and FIG. 4A is a side view.
(2) is a front view and FIG. 4 (3) is a bottom view. 2, FIG. 3, and FIG. 4, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

【0017】読取装置15は、光伝達部材9および一対
のLED5から成る光源装置1と、保護ガラス10と、
複数個のレンズ11と、レンズ11と同数個のセンサI
C13と、光伝達部材9およびレンズ11などを保持す
る筺体12などから構成される。光伝達部材9は、上面
にシリンドリカルレンズ部6が設けられる長尺状の導光
部3と、導光部3の底面に、たとえば所定の大きさAお
よび所定のピッチBで設けられる断面がたとえば三角形
状である複数個のプリズム4とから成り、ガラスまたは
PMMAなどによって、たとえば一体成形されて、原稿
2の主走査方向に沿って筺体内部に備えられる。光伝達
部材9の両端部の両側には、一対のLED5が配設され
る。センサIC13は、筺体12の底面に取付けられた
基板14に、主走査方向に沿って直線状に一定間隔で配
設されており、これに対応してレンズ11が、センサI
C13と1対1に対応するようにして筺体12内部に保
持される。
The reading device 15 includes a light source device 1 including a light transmitting member 9 and a pair of LEDs 5, a protective glass 10, and
A plurality of lenses 11 and the same number of sensors I as the lenses 11.
C13, and a housing 12 that holds the light transmission member 9, the lens 11, and the like. The light transmitting member 9 has an elongated light guide portion 3 having an upper surface provided with the cylindrical lens portion 6, and a cross section provided on the bottom surface of the light guide portion 3 with a predetermined size A and a predetermined pitch B, for example. It is composed of a plurality of triangular prisms 4 and is integrally formed of, for example, glass or PMMA, and is provided inside the housing along the main scanning direction of the original 2. A pair of LEDs 5 is arranged on both sides of both ends of the light transmitting member 9. The sensor ICs 13 are linearly arranged at regular intervals along the main scanning direction on a substrate 14 attached to the bottom surface of the housing 12, and the lens 11 corresponds to the sensor I.
It is held inside the housing 12 in a one-to-one correspondence with C13.

【0018】原稿2は、保護ガラス10の上面に接触し
ながら図示しない送りローラなどによって副走査方向に
沿って一定の速度で搬送される。この動作に併せて、L
ED5から発せられる光7は、光伝達部材9の導光部3
の両端面から光伝達部材9内部へ入射し、導光部3の底
面に設けられる複数のプリズム4の反射面8で反射され
て光路が原稿2方向に変えられ、導光部3の上面に設け
られるシリンドリカルレンズ部6を介して、副走査方向
に対して集光された後、筺体12の上面に取付けられる
保護ガラス10を介して、斜めから原稿2の読取位置1
6を均一に照明する。ここで、光伝達部材9は、シリン
ドリカルレンズ部6を介した光7が、読取位置16に集
光されるように、斜めに筺体12内部に備えられる。
The original 2 is conveyed at a constant speed in the sub-scanning direction by a feed roller or the like (not shown) while being in contact with the upper surface of the protective glass 10. Along with this operation, L
The light 7 emitted from the ED 5 is guided by the light guide portion 3 of the light transmitting member 9.
Enters the inside of the light transmission member 9 from both end faces of the light guide member 3 and is reflected by the reflecting surfaces 8 of the plurality of prisms 4 provided on the bottom surface of the light guide unit 3 to change the optical path in the direction of the original 2 and the upper surface of the light guide unit 3. After the light is focused in the sub-scanning direction via the cylindrical lens unit 6 provided, the reading position 1 of the original 2 is obliquely passed through the protective glass 10 attached to the upper surface of the housing 12.
Illuminate 6 uniformly. Here, the light transmitting member 9 is obliquely provided inside the housing 12 so that the light 7 that has passed through the cylindrical lens portion 6 is condensed at the reading position 16.

【0019】原稿2の読取位置16からの反射光17
は、再び保護ガラス10を介して筺体12内部へ入射
し、各レンズ11を介して、いくつかのブロックに分割
されて、それぞれ対応するセンサIC13上に結像す
る。センサIC13は、各原稿像を受光して原稿像に対
応した信号出力を行う。
Reflected light 17 from the reading position 16 of the original 2
Is again incident on the inside of the housing 12 through the protective glass 10, is divided into several blocks through each lens 11, and forms an image on the corresponding sensor IC 13. The sensor IC 13 receives each document image and outputs a signal corresponding to the document image.

【0020】筺体12は、アルミニウムなどの金属や、
ガラス繊維強化アクリルニトリル−ブタジェン−スチル
レン共重合体(ABS樹脂)、ガラス繊維強化プラスチ
ック、ガラスフィラー入りポリカーボネートなどの樹脂
から成り、読取用の光を通過させ、外部光を遮断する中
空構造を有し、主走査方向に沿って長尺状に形成され
る。
The housing 12 is made of metal such as aluminum,
It is made of resin such as glass fiber reinforced acrylonitrile-butadiene-stilrene copolymer (ABS resin), glass fiber reinforced plastic, polycarbonate with glass filler, etc., and has a hollow structure that allows reading light to pass through and blocks external light. Is formed in a long shape along the main scanning direction.

【0021】したがって、本実施例である読取装置15
によれば、LED5から発せられる光7は、光伝達部材
9の複数個のプリズム4によって反射された後、シリン
ドリカルレンズ部6を介して集光されて原稿2を均一に
照明するため、原稿2からの反射光17の光量変動を解
消することができる。また、LED5を光伝達部材9の
両端部の両側に設置するために、使用するLEDの数を
2個にすることができ、大幅な部品コストの低減を図る
ことができる。なお、本実施例では、LED5を光伝達
部材9の両側に設置したが、片側だけに設置してもよ
い。
Therefore, the reading device 15 according to the present embodiment.
According to the document, the light 7 emitted from the LED 5 is reflected by the plurality of prisms 4 of the light transmitting member 9 and then condensed through the cylindrical lens portion 6 to uniformly illuminate the original document 2. Fluctuations in the amount of reflected light 17 from can be eliminated. Further, since the LEDs 5 are installed on both sides of both ends of the light transmitting member 9, the number of LEDs to be used can be two, and the cost of parts can be significantly reduced. Although the LEDs 5 are installed on both sides of the light transmitting member 9 in this embodiment, they may be installed on only one side.

【0022】図5は、本発明の他の実施例の読取装置1
5aの構成を示す断面図であり、図2に示される読取装
置15と対応する部分には、同一の参照符号を付す。読
取装置15aにおいて特徴とする点は、SLA(セルフ
ォックレンズアレイ)19が備えられる点である。光伝
達部材9の両端部の両側に、先の実施例と同様にして備
えられる一対のLED5から発せられる光7は、光伝達
部材9を介し、保護ガラス10を介して斜めから原稿2
の読取位置16を均一に照明する。
FIG. 5 shows a reader 1 according to another embodiment of the present invention.
5a is a cross-sectional view showing the configuration of 5a, and the portions corresponding to those in the reading device 15 shown in FIG. 2 are designated by the same reference numerals. A feature of the reading device 15a is that an SLA (selfoc lens array) 19 is provided. The light 7 emitted from the pair of LEDs 5 provided on both sides of the light transmitting member 9 in the same manner as in the previous embodiment is obliquely transmitted through the light transmitting member 9 and the protective glass 10 through the original 2
The reading position 16 is uniformly illuminated.

【0023】原稿2の読取位置16からの反射光17
は、再び保護ガラス10を介して筺体12内部へ入射
し、筺体12内部に設けられる保持部18によって保持
されるSLA19を介し、筺体12の底部に取付けられ
る基板14aに設置されるセンサIC13a上に結像す
る。
Reflected light 17 from the reading position 16 of the original 2
Is again incident on the inside of the housing 12 through the protective glass 10 and, via the SLA 19 held by the holding portion 18 provided inside the housing 12, on the sensor IC 13a installed on the substrate 14a attached to the bottom of the housing 12. Form an image.

【0024】本実施例の読取装置15aによれば、LE
D5から発せられる光7は、光伝達部材9を介すことに
よって均一に原稿2を照明するので、原稿2からの反射
光17の光量が原稿像のパターンに対応した均一な光量
になり、さらに反射光17は、SLA19を介すことに
よって均一な光量のままセンサIC13a上に結像する
ために、センサIC13aからの信号出力を原稿像のパ
ターンに対応した均一な出力にすることができ、良好な
画質を得ることができる。
According to the reading device 15a of this embodiment, the LE
The light 7 emitted from D5 uniformly illuminates the original 2 through the light transmission member 9, so that the amount of the reflected light 17 from the original 2 becomes a uniform amount corresponding to the pattern of the original image, and Since the reflected light 17 is imaged on the sensor IC 13a with a uniform light quantity by passing through the SLA 19, the signal output from the sensor IC 13a can be made uniform output corresponding to the pattern of the original image, which is excellent. It is possible to obtain excellent image quality.

【0025】図6は図2に示される読取装置15に備え
られる光伝達部材9の一例である光伝達部材9aの外観
図であり、図6(1)は正面図であり、図6(2)は底
面図である。図6において、図4に示される光伝達部材
9と対応する部分には同一の参照符号を付す。
FIG. 6 is an external view of a light transmitting member 9a which is an example of the light transmitting member 9 provided in the reading device 15 shown in FIG. 2, FIG. 6 (1) is a front view, and FIG. ) Is a bottom view. 6, parts corresponding to those of the light transmitting member 9 shown in FIG. 4 are designated by the same reference numerals.

【0026】図5に示される読取装置15aでは、光学
系にSLA19を用いるために、原稿2からの反射光1
7の光量が均一であればあるほど、センサIC13a上
に結像される像の光量は均一になり、センサIC13a
からは均一な信号出力が得られる。これに対し、図2に
示される読取装置15では、光学系に複数個のレンズ1
1を用いており、原稿2からの反射光17の光路が各レ
ンズ11の周辺部を通れば通るほど、光量が減少するた
めに、センサIC13から均一な信号出力を得ようとす
る場合には、レンズ11の配置に対応して原稿2からの
反射光17の光量を予め変化する必要がある。
In the reading device 15a shown in FIG. 5, since the SLA 19 is used for the optical system, the reflected light 1 from the original 2 is reflected.
The more uniform the light quantity of 7 is, the more uniform the light quantity of the image formed on the sensor IC 13a becomes.
From, a uniform signal output can be obtained. On the other hand, in the reader 15 shown in FIG. 2, a plurality of lenses 1 are provided in the optical system.
1 is used, and the light amount decreases as the optical path of the reflected light 17 from the original 2 passes through the peripheral portion of each lens 11, so that when a uniform signal output is to be obtained from the sensor IC 13, It is necessary to change the light quantity of the reflected light 17 from the original 2 in advance in accordance with the arrangement of the lens 11.

【0027】本例の光伝達部材9aでは、導光部3の底
面に設けられる複数のプリズム4は、複数個のレンズ1
1の配置間隔と対応した所定の周期Tでプリズム4の分
布が粗な部分と密な部分とが生じるように配設される。
光伝達部材9aが読取装置15に備えられると、LED
5から発せられる光7は、光伝達部材9aに入射し、周
期Tで粗な部分と密な部分とが設けられる複数のプリズ
ム4で反射され、シリンドリカルレンズ部6を介して集
光されて、保護ガラス10を介して原稿2を照明する。
このとき、原稿2を照明する光7の光量には、プリズム
4の分布に対応して、原稿2の主走査方向に沿って周期
Tで光量の多い部分と少ない部分とが生じ、これに伴っ
て原稿2からの反射光17の光量にも、同様に周期Tで
光量の多い部分と少ない部分とが生じる。
In the light transmitting member 9a of this example, the plurality of prisms 4 provided on the bottom surface of the light guide portion 3 are the plurality of lenses 1
The prisms 4 are arranged so that a rough distribution and a dense distribution occur in the distribution of the prisms 4 at a predetermined cycle T corresponding to the arrangement interval of 1.
When the light transmission member 9a is provided in the reading device 15, the LED
Light 7 emitted from 5 is incident on the light transmission member 9a, is reflected by a plurality of prisms 4 provided with a rough portion and a dense portion at a period T, and is condensed via the cylindrical lens portion 6, The original 2 is illuminated through the protective glass 10.
At this time, the light amount of the light 7 illuminating the document 2 includes a part having a large amount of light and a part having a small amount of light with a period T along the main scanning direction of the document 2 in accordance with the distribution of the prism 4. Similarly, the amount of the reflected light 17 from the document 2 also has a portion having a large amount of light and a portion having a small amount of light in the cycle T.

【0028】光伝達部材9aは、原稿2からの反射光1
7の各光量の多い部分が、各レンズの周辺部を通って、
各センサIC13に到達するように、また各光量の少な
い部分が、各レンズの中央部を通って各センサIC13
に到達するようにして筺体12内部に備えられており、
前記プリズム4の粗密のパターンは、各センサIC13
上に結像する像の光量が均一になるようにして選ばれ
る。したがって、光伝達部材9aを備える読取装置15
によれば、各センサIC13からは、原稿2の像に対応
した均一な信号出力を得ることができ、画質を向上する
ことができる。
The light transmitting member 9a receives the reflected light 1 from the original 2.
Each light-rich part of 7 passes through the peripheral part of each lens,
A portion having a small amount of light passes through the central portion of each lens so that each sensor IC13 reaches each sensor IC13.
Is provided inside the housing 12 so as to reach
The density pattern of the prism 4 corresponds to each sensor IC 13
It is selected so that the light amount of the image formed on the upper surface is uniform. Therefore, the reading device 15 including the light transmission member 9a
According to this, a uniform signal output corresponding to the image of the original 2 can be obtained from each sensor IC 13, and the image quality can be improved.

【0029】図7は、図2に示される読取装置15に備
えられる光伝達部材9の他の例である光伝達部材9bの
外観図および断面図であり、図7(1)は正面図であ
り、図7(2)は底面図であり、図7(3)は図7
(2)における切断面線P−Pから見た断面図であり、
図7(4)は図7(2)における切断面線Q−Qから見
た断面図である。図7において、図4に示される光伝達
部材9と対応する部分には同一の参照符号を付す。
FIG. 7 is an external view and a sectional view of a light transmitting member 9b which is another example of the light transmitting member 9 provided in the reading device 15 shown in FIG. 2, and FIG. 7 (1) is a front view. Yes, FIG. 7 (2) is a bottom view, and FIG. 7 (3) is FIG.
FIG. 6 is a cross-sectional view taken along the section line P-P in (2),
FIG. 7 (4) is a sectional view taken along the section line Q-Q in FIG. 7 (2). 7, parts corresponding to those of the light transmitting member 9 shown in FIG. 4 are designated by the same reference numerals.

【0030】本例の光伝達部材9bにおいて特徴とする
点は、導光部3の底面に所定のピッチBで設けられる複
数のプリズム4aの大きさが、各レンズ11の配置間隔
に対応した所定の周期Tで、最小値A2から最大値A1
までの範囲で連続的に変化する点である。したがって光
伝達部材9bが読取装置15に備えられて、原稿2の照
明が行われると、原稿2からの反射光17の光量には、
前記プリズム4aの大きさの大小の変化に対応して、原
稿2の主走査方向に沿って周期Tで光量の多い部分と少
ない部分とが生じ、前記プリズム4aの大小の変化の仕
方を適当に選ぶことによって、各レンズ11を介して各
センサIC13上に結像される像の光量を均一にするこ
とができる。
A feature of the light transmitting member 9b of this example is that the size of the plurality of prisms 4a provided at the predetermined pitch B on the bottom surface of the light guide portion 3 is a predetermined value corresponding to the arrangement interval of each lens 11. From the minimum value A2 to the maximum value A1 in the cycle T of
It is a point that changes continuously in the range up to. Therefore, when the light transmitting member 9b is provided in the reading device 15 and the original 2 is illuminated, the light amount of the reflected light 17 from the original 2 becomes
Corresponding to the change in size of the prism 4a, a part having a large amount of light and a part having a small amount of light are generated in the period T along the main scanning direction of the document 2, so that the size of the prism 4a can be changed appropriately. By selecting it, the light amount of the image formed on each sensor IC 13 via each lens 11 can be made uniform.

【0031】[0031]

【発明の効果】以上のように本発明によれば、たとえば
導光部材の両端部の両側に配設された光源から発せられ
る光は、導光部材に入射し、導光部材の底面などに設け
られる複数個のプリズムによって反射されて導光部材か
ら出射するために、原稿を均一に照明することができ
る。また、光源に用いるLEDは、たとえば導光部材の
両側に1つずつ配設すればよいために、部品コストを低
減することができる。
As described above, according to the present invention, for example, the light emitted from the light sources arranged at both ends of the light guide member is incident on the light guide member and is reflected on the bottom surface of the light guide member. Since the light is reflected by the plurality of prisms provided and emitted from the light guide member, the original can be uniformly illuminated. Further, since the LEDs used for the light source may be provided, for example, one on each side of the light guide member, the cost of parts can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の読取装置15に備えられる光源装置1
の構成図である。
FIG. 1 is a light source device 1 included in a reading device 15 of the present invention.
It is a block diagram of.

【図2】本発明の一実施例の読取装置15の構成を示す
断面図である。
FIG. 2 is a cross-sectional view showing a configuration of a reading device 15 according to an embodiment of the present invention.

【図3】読取装置15の概略斜視図である。3 is a schematic perspective view of the reading device 15. FIG.

【図4】読取装置15に備えられる光伝達部材9の外観
図であり、図4(1)は側面図であり、図4(2)は正
面図であり、図4(3)は底面図である。
4A and 4B are external views of a light transmission member 9 included in the reading device 15, FIG. 4A is a side view, FIG. 4B is a front view, and FIG. 4C is a bottom view. Is.

【図5】本発明の他の実施例の読取装置15aの構成を
示す断面図である。
FIG. 5 is a sectional view showing the configuration of a reading device 15a according to another embodiment of the present invention.

【図6】読取装置15に備えられる光伝達部材9の一例
である光伝達部材9aの外観図であり、図6(1)は正
面図であり、図6(2)は底面図である。
6A and 6B are external views of a light transmission member 9a which is an example of the light transmission member 9 provided in the reading device 15, FIG. 6A is a front view, and FIG. 6B is a bottom view.

【図7】読取装置15に備えられる光伝達部材9の他の
例である光伝達部材9bの外観図および断面図であり、
図7(1)は正面図であり、図7(2)は底面図であ
り、図7(3)は図7(2)における切断面線P−Pか
ら見た断面図であり、図7(4)は図7(2)における
切断面線Q−Qから見た断面図である。
7A and 7B are an external view and a cross-sectional view of a light transmitting member 9b that is another example of the light transmitting member 9 provided in the reading device 15.
7 (1) is a front view, FIG. 7 (2) is a bottom view, FIG. 7 (3) is a sectional view taken along the section line P-P in FIG. 7 (2), and FIG. (4) is a sectional view taken along the section line Q-Q in FIG. 7 (2).

【図8】図8(1)は従来の読取装置においてLEDか
ら発せられる光の光量のムラを示す図であり、図8
(2)は原稿からの反射光がレンズを通過する際の光量
の減少する度合いを示す図であり、図8(3)はLED
を各レンズの間に配設したときの受光素子からの信号出
力を示す図である。
FIG. 8A is a diagram showing unevenness in the amount of light emitted from the LED in the conventional reading device.
(2) is a diagram showing the degree of decrease in the amount of light when the reflected light from the document passes through the lens, and FIG. 8 (3) is an LED.
FIG. 7 is a diagram showing a signal output from the light receiving element when the is arranged between the respective lenses.

【符号の説明】[Explanation of symbols]

1 光源装置 2 原稿 3 導光部 4,4a プリズム 5 LED 6 シリンドリカルレンズ部 9,9a,9b 光伝達部材 10 保護ガラス 11 レンズ 12 筺体 13,13a センサIC 15,15a 読取装置 19 SLA DESCRIPTION OF SYMBOLS 1 Light source device 2 Original 3 Light guide part 4, 4a Prism 5 LED 6 Cylindrical lens part 9, 9a, 9b Light transmission member 10 Protective glass 11 Lens 12 Housing 13, 13a Sensor IC 15, 15a Reading device 19 SLA

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 原稿と接触する透光板と、 原稿を照明する光源装置と、 原稿からの反射光を結像するレンズと、 前記レンズが結像した像を光電変換する受光素子と、 前記透光板、光源装置、レンズ、および受光素子を保持
する筺体とを備える読取装置において、 前記光源装置が、光源と、前記光源からの光を導く導光
部材と、前記導光部材を通過した光を原稿側に反射する
複数個のプリズムとを具備することを特徴とする読取装
置。
1. A light-transmitting plate in contact with an original, a light source device for illuminating the original, a lens for forming an image of reflected light from the original, a light-receiving element for photoelectrically converting an image formed by the lens, In a reading device including a translucent plate, a light source device, a lens, and a housing holding a light receiving element, the light source device passes through the light source, a light guide member that guides light from the light source, and the light guide member. A reading device comprising: a plurality of prisms that reflect light toward a document.
JP5329176A 1993-12-27 1993-12-27 Reader Pending JPH07193675A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5329176A JPH07193675A (en) 1993-12-27 1993-12-27 Reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5329176A JPH07193675A (en) 1993-12-27 1993-12-27 Reader

Publications (1)

Publication Number Publication Date
JPH07193675A true JPH07193675A (en) 1995-07-28

Family

ID=18218503

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5329176A Pending JPH07193675A (en) 1993-12-27 1993-12-27 Reader

Country Status (1)

Country Link
JP (1) JPH07193675A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6326602B1 (en) 1996-02-09 2001-12-04 Canon Kabushiki Kaisha Image reading apparatus having light source electrically and directly connected to image sensor board
US7911661B2 (en) 2006-01-27 2011-03-22 Brother Kogyo Kabushiki Kaisha Image reading device
US9191541B2 (en) 2013-12-26 2015-11-17 Kyocera Document Solutions Inc. Illumination device and image reading device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6326602B1 (en) 1996-02-09 2001-12-04 Canon Kabushiki Kaisha Image reading apparatus having light source electrically and directly connected to image sensor board
US6337476B2 (en) 1996-02-09 2002-01-08 Canon Kabushiki Kaisha Image reading apparatus having light source electrically and directly connected to image sensor board
US7911661B2 (en) 2006-01-27 2011-03-22 Brother Kogyo Kabushiki Kaisha Image reading device
US9191541B2 (en) 2013-12-26 2015-11-17 Kyocera Document Solutions Inc. Illumination device and image reading device

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