JPH03258075A - Original reader - Google Patents

Original reader

Info

Publication number
JPH03258075A
JPH03258075A JP2054970A JP5497090A JPH03258075A JP H03258075 A JPH03258075 A JP H03258075A JP 2054970 A JP2054970 A JP 2054970A JP 5497090 A JP5497090 A JP 5497090A JP H03258075 A JPH03258075 A JP H03258075A
Authority
JP
Japan
Prior art keywords
light source
photoelectric conversion
conversion unit
light sources
light
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
JP2054970A
Other languages
Japanese (ja)
Inventor
Hiroshi Mitsuda
満田 浩
Takafumi Nishioka
隆文 西岡
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2054970A priority Critical patent/JPH03258075A/en
Publication of JPH03258075A publication Critical patent/JPH03258075A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To eliminate the need for the carrying of a light source device for a transparent original by lighting only a light source emitting a light to a part with a photoelectric conversion unit of the transparent original opposed thereto sequentially among light sources in response to the carrier position of the photoelectric conversion unit. CONSTITUTION:When an effective scanning range on an original platen 2 is divided into 6 blocks l1-l6 and a photoelectric conversion unit 6 is placed in the block l1, 1st and 2nd light sources 8a, 8b are selected and when the photoelectric conversion unit 6 is placed in the block l2, 2nd and 3rd light sources 8b, 8c are selected sequentially and then light sources 8a-8g are sequentially lighted. In this case, a uniform illuminance distribution is obtained for each block. Then a light source 8 is fixed and not moved during at least the reading and a control section only selects the light sources 8a-8g to be lighted, then the control of the light source device 8 is simplified. Thus, the suppression of the vibration due to the carrying of the light source device 8 is not required.

Description

【発明の詳細な説明】 [産業上の利用分野] この発明は、原稿読取装置、特に光電変換ユニットを用
いて透明形原稿の読取を行う原稿読取装置に関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a document reading device, and particularly to a document reading device that reads a transparent document using a photoelectric conversion unit.

[従来の技術] 第3図は例えば特開昭64−25668号公報に示され
たものと同様の従来の原稿読取装置の断面図である。
[Prior Art] FIG. 3 is a sectional view of a conventional document reading device similar to that disclosed in, for example, Japanese Patent Laid-Open No. 64-25668.

図において、符号(1)は透明な原稿台、(2〉は原稿
台〈1〉上に直かれた透明形原稿、(3〉は透明形原稿
(2〉上に置かれた拡散板、(4)は原稿白く1)の上
面に対向しているとともに、主走査方向く図の紙面垂直
方向〉に延びている透明形原稿用光源、(5〉は透明形
原稿用光源(4)を副走査方向く図中矢印A方向〉l\
原稿台(1)と平行に搬送する第1の搬送手段である。
In the figure, symbol (1) is a transparent original platen, (2> is a transparent original placed on the original platen <1>, (3> is a diffuser plate placed on the transparent original (2>), ( 4) is a transparent document light source that is white and faces the top surface of the document 1) and extends in the main scanning direction (perpendicular to the paper surface of the figure); (5) is a transparent document light source (4) that is a secondary source. Scanning direction: direction of arrow A in the figure〉l\
This is a first conveyance means that conveys the document parallel to the document table (1).

(6〉は原稿台(1)の下面に対向しているとともに、
主走査方向に延びている光電変換ユニットであり、この
光電変換ユニット(6〉は、反射形原稿用光源(6m)
、レンズ(eb)、及び光電変換器(,6e)を有して
いる。また、光電変換器〈6c〉としては、例えばCO
Dやフォトダイオードなどが用いられ、゛自己走査機能
により主走査を朽い、主走査方向に対して原稿を読み取
る。(7)は光電変換ユニット(6〉を副走査方向へ原
稿台(1〉と平行に搬送する第2の搬送手段である。
(6> faces the bottom surface of the document table (1), and
This photoelectric conversion unit (6) extends in the main scanning direction, and this photoelectric conversion unit (6) is a reflective original light source (6 m).
, a lens (eb), and a photoelectric converter (, 6e). In addition, as the photoelectric converter <6c>, for example, CO
D, photodiode, etc. are used, and the document is read in the main scanning direction by performing main scanning with a self-scanning function. (7) is a second conveyance means for conveying the photoelectric conversion unit (6>) in the sub-scanning direction in parallel with the document table (1>).

上記のように構成された従来の原稿読取装置においては
、透明短原稿(2)を読み取る場合、まず透明短原稿用
光源〈4〉から光が照射される。
In the conventional document reading device configured as described above, when reading a transparent short document (2), light is first irradiated from the transparent short document light source <4>.

この光は、拡散板(3〉で拡散され、透明短原稿(2〉
に均一に照射され、透明短原稿(2〉を透過する。透明
短原稿(2)を透過した光は、レンズ(6b)で集光さ
れ、光電変換器〈6c)の受光面(図示せず)上に結像
して光電変換される。このとき、光電変換器(6c〉の
自己走査機能により、主走査が行われる。
This light is diffused by the diffuser plate (3>), and the transparent short original (2>
The light is uniformly irradiated to the transparent short original (2) and transmitted through the transparent short original (2). ) and is photoelectrically converted. At this time, main scanning is performed by the self-scanning function of the photoelectric converter (6c).

このような主走査を行いながら、第2の搬送手段(7)
により光電変換ユニット(6〉を副走査方向へ搬送する
ことによって、透明短原稿(2〉の全面の読取が行われ
る。このとき、制御部(図示せず〉により、透明短原稿
用光源(4〉が、光電変換ユニット(6)の搬送速度と
同じ速度で副走査方向へ搬送される。これによって、透
明短原稿(2〉は常に同一の条件で照明される。
While performing such main scanning, the second conveying means (7)
By conveying the photoelectric conversion unit (6) in the sub-scanning direction, the entire surface of the transparent short original (2) is read. At this time, the control unit (not shown) turns on the transparent short original light source (4). > is conveyed in the sub-scanning direction at the same speed as the conveyance speed of the photoelectric conversion unit (6).Thereby, the transparent short original (2>) is always illuminated under the same conditions.

[発明が解決しようとする課題] 上記のように構成された従来の原稿読取装置においては
、特に光電変換ユニット(6)の搬送速度をその使用条
件により様々に変化させたり、途中で一時停止させたり
しなければならないため、透明短原稿用光源(4〉の搬
送速度を光電変換ユニット(6〉の搬送速度に同期させ
るのは、その制御が複雑であり、また搬送時の透明短原
稿用光源(4〉の機械的な振動は、光電変換器(6C)
から出力される光電信号にレベル変動として悪影響を及
ぼすため、第1の搬送手段(5)の構造の精度を振動を
抑えるために高くする必要があり、これらによりコスト
が全体としてかなり高くなってしまうという問題点があ
った。
[Problems to be Solved by the Invention] In the conventional document reading device configured as described above, in particular, the conveyance speed of the photoelectric conversion unit (6) is variously changed depending on the usage conditions, or the conveyance speed is temporarily stopped midway. Therefore, synchronizing the transport speed of the light source for transparent short documents (4>) with the transport speed of the photoelectric conversion unit (6>) is complicated, and the light source for transparent short documents during transport is complicated. (4) Mechanical vibration is caused by photoelectric converter (6C)
Since this adversely affects the photoelectric signal output from the photoelectric signal as a level fluctuation, it is necessary to increase the accuracy of the structure of the first conveying means (5) in order to suppress vibrations, which increases the overall cost considerably. There was a problem.

この発明は、上記のような問題点を解決することを課題
としてなされたものであり、透明形原稿用の光源装置の
搬送を不要にでき、これによりこの光源装置に振動が生
じるのを容易に防止でき、かつこの光源装置の制御を簡
単にすることができ、これらの結果全体のコストを低く
することができる原稿読取装置を得ることを目的とする
This invention was made with the aim of solving the above-mentioned problems, and it is possible to eliminate the need for transporting a light source device for transparent documents, and thereby easily prevent vibrations from occurring in this light source device. It is an object of the present invention to provide a document reading device that can prevent the above problems, simplify the control of the light source device, and reduce the overall cost as a result.

[課題を解決するための手段] この発明に係る原稿読取装置は、それぞれ主走査方向に
延びているとともに副走査方向に互いに間隔をおいて設
けられている複数の光源を有している光源装置を原稿台
の一方の面に対向させ、かつ複数の光源が順次点灯する
ように制御部により光源装置を制御するようにしたもの
である。
[Means for Solving the Problems] A document reading device according to the present invention includes a light source device having a plurality of light sources each extending in the main scanning direction and spaced apart from each other in the sub-scanning direction. The light source device is arranged to face one surface of the document table, and the light source device is controlled by a control section so that a plurality of light sources are sequentially turned on.

f作用] この発明においては、制御部が光源装置を制御すること
により、光電変換ユニットの搬送位置に応じて、複数の
光源のうち透明形、原稿の光電変換ユニットが対向して
いる部分に光を照射する光源のみが順次点灯する。
f Effect] In the present invention, the control section controls the light source device, so that the transparent type of the plurality of light sources illuminates the portion of the original where the photoelectric conversion unit is facing, depending on the conveyance position of the photoelectric conversion unit. Only the light sources that emit light are turned on sequentially.

[実施例] 以下、この発明の実施例を図について説明する。[Example] Embodiments of the present invention will be described below with reference to the drawings.

第1図はこの発明の一実施例による原稿読取装置の断面
図であり、第3図と同−又は相当部分には同一符号を付
し、その説明を省略する。
FIG. 1 is a sectional view of a document reading device according to an embodiment of the present invention, and the same or equivalent parts as in FIG. 3 are designated by the same reference numerals, and their explanation will be omitted.

図において、符号(8〉は原稿台(1)の上面に対向し
ている光源装置であり、この光源装置く8〉は、それぞ
れ主走査方向に延びているとともに副走査方向に互いに
間隔をおいて平行に設けられている第1ないし第7の光
源〈8a)〜(8g〉を有している。また、複数の光源
からの光を原稿台(1〉上に均一に照射させるため、各
光源(8a〉〜(8g〉の上方に反射板(9)が設けら
れているとともに、透明短原稿(2)と光源装置く8)
との間には2枚の拡散板(3〉が設けられている。
In the figure, the reference numeral (8>) is a light source device facing the upper surface of the document table (1), and the light source devices (8) each extend in the main scanning direction and are spaced apart from each other in the sub-scanning direction. It has first to seventh light sources (8a) to (8g) which are provided in parallel with each other.In addition, in order to uniformly irradiate the light from the plurality of light sources onto the document table (1), each A reflective plate (9) is provided above the light source (8a> to (8g>), and a transparent short original (2) and a light source device (8)
Two diffusion plates (3) are provided between the two.

さらに、光源装置く8)には制御部(図示せず)が接続
されている。
Further, a control section (not shown) is connected to the light source device (8).

この制御部は、第1ないし第7の光源(8&)〜(8g
)のうち光電変換ユニット(6)の上方に位置する2つ
の光源のみが順次点灯するように光源装af(8)を制
御する。
This control section controls the first to seventh light sources (8&) to (8g
), the light source device af (8) is controlled so that only the two light sources located above the photoelectric conversion unit (6) are sequentially turned on.

上記のように構成された原稿読取装置においては、光源
装置(8)により透明形原稿(2)に光が照射され、ま
た従来同様に光電変換器(6C)の自己走査機能により
主走査が行われるとともに、光電変換ユニット(6)を
搬送することにより副走査が行われる。これにより、透
明形原稿(2)の全面に対して光電変換の走査が行われ
、光電変換器(6c〉から信号が出力されることにより
、原稿の読取が行われる。
In the document reading device configured as described above, light is irradiated onto the transparent document (2) by the light source device (8), and main scanning is performed by the self-scanning function of the photoelectric converter (6C) as in the conventional case. At the same time, sub-scanning is performed by transporting the photoelectric conversion unit (6). As a result, the entire surface of the transparent original (2) is scanned by photoelectric conversion, and a signal is output from the photoelectric converter (6c>), thereby reading the original.

このとき、光源装置(8)は制御部により制御されてお
り、各光源(8a)〜(8g)のうちの2つずつが順次
点灯される。
At this time, the light source device (8) is controlled by the control unit, and two of the light sources (8a) to (8g) are sequentially turned on.

第2図は各光源〈8a〉〜(8g)の点灯状態の違いに
よる副走査方向への照度分布の違いを説明する説明図で
あり、(a)は全光源(8a〉〜(8g)を点灯したと
き、(b)は第1及び第2の光源(8a) 、 (8b
)を点灯したとき、(c)は第2及び第3の光源(8b
) 、(8e)を点灯したとき、(d)は第3及び第4
の光源(8c) 、(8d)を点灯したとき、(e)は
第4及び第5の光源(8d) 、(8e)を点灯したと
き、(f)は第5及び第6の光源(8e〉、(8f)を
点灯したとき、(g)は第6及び第7の光源(8f) 
、(8g>を点灯したときの照度分布である。
Fig. 2 is an explanatory diagram illustrating the difference in illuminance distribution in the sub-scanning direction due to the difference in the lighting state of each light source <8a> to (8g). When lit, (b) is the first and second light source (8a), (8b
) is turned on, (c) is the second and third light source (8b
), when (8e) is lit, (d) is the third and fourth
When the light sources (8c) and (8d) are turned on, (e) is when the fourth and fifth light sources (8d) and (8e) are turned on, and (f) is when the fifth and sixth light sources (8e) are turned on. >, (8f) is turned on, (g) is the sixth and seventh light source (8f)
, (8g>) is the illuminance distribution when the lights are turned on.

原稿台(2)上の有効走査範囲X−Yをl、〜1、の6
区間に分けると、光電変換ユニット(6)が区間l、に
位置するときは第1及び第2の光源(8m> 、(8b
)を、区間12に位置するときは第2及び第3の光源(
8b ) 、 (8c )を、というように順次切り換
えて各光源(8a〉〜(8g)を点灯させていくことに
より、第2図(b)〜(g)に示すように、各区間に均
一な照度分布が得られる。
The effective scanning range X-Y on the document table (2) is l, ~1,6.
When divided into sections, when the photoelectric conversion unit (6) is located in section l, the first and second light sources (8m>, (8b
), and when located in section 12, the second and third light sources (
8b), (8c), and so on to turn on each light source (8a> to (8g)), the light is uniformly distributed in each section as shown in Figure 2 (b) to (g). A bright illuminance distribution can be obtained.

このような原稿読取装置では、少なくとも読取中は光源
装置(8)が固定されて動かず、制御部では点灯させる
光源(8a〉〜(8g)を選択して切り換えるだけであ
るため、従来に比べ光源装置(8)の制御は簡単になる
。また、光源装置(8)の搬送による振動を抑える必要
もないため、全体としてコストを低くすることができる
In such document reading devices, the light source device (8) is fixed and does not move at least during reading, and the control unit only selects and switches the light sources (8a> to (8g)) to be turned on. The light source device (8) can be easily controlled.Furthermore, since there is no need to suppress vibrations caused by transportation of the light source device (8), the overall cost can be reduced.

また、各光源(8a〉〜(8g)のうち、同時に点灯す
るのは2つのみであるため、電力消費の増大を防止する
こともできる0例えば、各光源(8a〉〜(8g〉に、
10〜20Wのランプを使用すると、全部同時に点灯し
た場合の電力は70〜140Wであるが、上記実施例で
は20〜40Wでよいことになる。
In addition, since only two of the light sources (8a> to (8g)) are lit at the same time, an increase in power consumption can be prevented.For example, for each light source (8a> to (8g),
If 10 to 20 W lamps are used, the power when all of them are lit at the same time is 70 to 140 W, but in the above embodiment, 20 to 40 W is sufficient.

なお、上記実施例では光源装置(8)として7つの光源
(8a)〜(8g〉を有するものを示したが、光源の総
数はこれに限定されるものではない。
In the above embodiment, the light source device (8) has seven light sources (8a) to (8g), but the total number of light sources is not limited to this.

また、上記実施例では各光源(8a)〜(’8g)のう
ちから2つずつを点灯させるものを示したが、1つずつ
でもよく、また3つ以上ずつであってもよい。
Further, in the above embodiment, two out of the light sources (8a) to ('8g) are turned on, but one at a time or three or more at a time may be turned on.

さらに、上記実施例では照明を均一化するために拡散板
(3〉及び反射板(9)を用いたが、均一化する方法は
これに限定されるものではなく、例えば光源装置(8)
からの光を平行光にする一次元のフレネルレンズなどを
用いてもよい。
Further, in the above embodiment, the diffuser plate (3) and the reflector plate (9) were used to make the illumination uniform, but the method of making the illumination uniform is not limited to this. For example, the light source device (8)
A one-dimensional Fresnel lens or the like that converts the light from the lens into parallel light may also be used.

さらにまた、上記実施例では透明形原M(2)及び反射
形原稿のいずれにも使用できる原稿読取装置を示したが
、透明形原稿(2)専用、即ち光電変換ユニット(6)
に反射形原稿用光源(6a)がないものであってもよい
Furthermore, in the above embodiment, the document reading device that can be used for both the transparent original M (2) and the reflective original is shown, but the photoelectric conversion unit (6) is designed exclusively for the transparent original (2).
It is also possible that there is no reflective original light source (6a).

また、上記実施例では原稿台〈1〉の上方に光源装置く
8〉を、下方に光電変換ユニット(6)を配置したが、
上下逆にするなどしてもよい。
Furthermore, in the above embodiment, the light source device (8) was placed above the document table (1), and the photoelectric conversion unit (6) was placed below.
You may also turn it upside down.

[発明の効果] 以上説明したように、この発明の原稿読取装置は、複数
の光源を有している透明形原稿用の光源装置を原稿台に
対向させ、かつ制御部によりこの光源装置を制御して、
光電変換ユニットの搬送位置に応じて、複数の光源のう
ち透明形原稿の光電変換ユニットが対向している部分に
光を照射する光源のみが順次点灯するようにしたので、
透明形原稿用の光源装置の搬送を不要にでき、これによ
りこの光源装置の搬送による振動を防止する必要がなく
なり、かつ光源装置の制御を簡単にすることができ、こ
れらの結果全体のコストを低くすることができるという
効果を奏する。
[Effects of the Invention] As explained above, in the document reading device of the present invention, a light source device for transparent documents having a plurality of light sources is arranged to face the document table, and this light source device is controlled by a control section. do,
Depending on the conveyance position of the photoelectric conversion unit, only the light source that irradiates the portion of the transparent document facing the photoelectric conversion unit among the multiple light sources is turned on in sequence.
This eliminates the need to transport the light source device for transparent documents, eliminates the need to prevent vibrations caused by transport of the light source device, and simplifies control of the light source device, resulting in lower overall costs. This has the effect that it can be lowered.

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

第1図はこの発明の一実施例を示す断面図、第2図は第
1図の各光源の点灯状態の違いによる副走査方向への照
度分布の違いを説明する説明図、第3図は従来例の断面
図である。 図において、(1〉は原稿台、(2)は透明形原稿、(
6)は光電変換ユニット、(7〉は第2の搬送手段、〈
8〉は光源装置、〈8a〉〜(8g〉は第1ないし第7
の光源である。 なお、各図中、同一符号は同−又は相当部分を示す。
FIG. 1 is a cross-sectional view showing one embodiment of the present invention, FIG. 2 is an explanatory diagram illustrating the difference in illuminance distribution in the sub-scanning direction due to the difference in the lighting state of each light source in FIG. 1, and FIG. It is a sectional view of a conventional example. In the figure, (1> is the original platen, (2) is the transparent original, (
6) is a photoelectric conversion unit, (7> is a second conveyance means,
8> is a light source device, <8a> to (8g) are first to seventh
It is a light source. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] 透明形原稿が置かれる原稿台と、それぞれ主走査方向に
延びているとともに副走査方向に互いに間隔をおいて設
けられている複数の光源を有しており、かつ前記原稿台
の一方の面に対向している光源装置と、前記原稿台の他
方の面に対向しているとともに、主走査方向に延びてお
り、前記光源部から照射され前記透明形原稿を透過した
光を受光して光電変換を行う光電変換ユニットと、この
光電変換ユニットを副走査方向へ移動させる搬送手段と
、前記光電変換ユニットの搬送位置に応じて、前記複数
の光源のうち前記透明形原稿の前記光電変換ユニットが
対向している部分に光を照射する光源のみが順次点灯す
るように前記光源装置を制御する制御部とを備えている
ことを特徴とする原稿読取装置。
It has a document table on which a transparent document is placed, and a plurality of light sources each extending in the main scanning direction and spaced apart from each other in the sub-scanning direction, and on one side of the document table. A light source device faces the other side of the document table and extends in the main scanning direction, and receives light emitted from the light source unit and transmitted through the transparent document and converts it into electricity. a photoelectric conversion unit that performs this, a conveying means that moves this photoelectric conversion unit in the sub-scanning direction, and a photoelectric conversion unit that faces the transparent original among the plurality of light sources depending on the conveyance position of the photoelectric conversion unit. 1. A control section that controls the light source device so that only the light sources that irradiate light onto a portion of the document are sequentially turned on.
JP2054970A 1990-03-08 1990-03-08 Original reader Pending JPH03258075A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2054970A JPH03258075A (en) 1990-03-08 1990-03-08 Original reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2054970A JPH03258075A (en) 1990-03-08 1990-03-08 Original reader

Publications (1)

Publication Number Publication Date
JPH03258075A true JPH03258075A (en) 1991-11-18

Family

ID=12985516

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2054970A Pending JPH03258075A (en) 1990-03-08 1990-03-08 Original reader

Country Status (1)

Country Link
JP (1) JPH03258075A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06350810A (en) * 1993-06-10 1994-12-22 Nec Corp Transmissive original scanning device
US7692822B2 (en) 2004-08-16 2010-04-06 Konica Minolta Business Technologies, Inc. Image reading apparatus, image forming apparatus and image reading method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06350810A (en) * 1993-06-10 1994-12-22 Nec Corp Transmissive original scanning device
JP2555932B2 (en) * 1993-06-10 1996-11-20 日本電気株式会社 Transparent original scanning device
US7692822B2 (en) 2004-08-16 2010-04-06 Konica Minolta Business Technologies, Inc. Image reading apparatus, image forming apparatus and image reading method

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