JPH0795793B2 - Image reader - Google Patents
Image readerInfo
- Publication number
- JPH0795793B2 JPH0795793B2 JP60176617A JP17661785A JPH0795793B2 JP H0795793 B2 JPH0795793 B2 JP H0795793B2 JP 60176617 A JP60176617 A JP 60176617A JP 17661785 A JP17661785 A JP 17661785A JP H0795793 B2 JPH0795793 B2 JP H0795793B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- document
- optical sensor
- image reading
- reflected
- 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.)
- Expired - Lifetime
Links
- 230000003287 optical effect Effects 0.000 claims description 18
- 239000000835 fiber Substances 0.000 claims description 7
- 239000006104 solid solution Substances 0.000 claims description 5
- UHYPYGJEEGLRJD-UHFFFAOYSA-N cadmium(2+);selenium(2-) Chemical compound [Se-2].[Cd+2] UHYPYGJEEGLRJD-UHFFFAOYSA-N 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 description 3
- 230000004298 light response Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Facsimile Scanning Arrangements (AREA)
- Facsimile Heads (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、ファクシミリなど各種のOA機器に用いられる
原稿の幅と同一寸法を有する高速読取を可能にした画像
読取装置に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus capable of high-speed reading having the same size as the width of a document used in various OA equipment such as a facsimile.
従来の技術 従来、この種の画像読取装置では、センサとして光電流
が大きく回路構成が簡単なCdS−CdSe固溶体を用いたも
のが実用化されているが、このセンサの光応答速度が遅
いためA4版（８素子/mm、1728素子）で10msec/line程度
と読取速度が遅いという欠点があった。そのため、例え
ば特願昭59−181751号に示されているように、第３図の
ような構造でバイアス光を加えて高速読取を可能にする
改良がなされた。2. Description of the Related Art Conventionally, in this type of image reading device, a sensor using a CdS-CdSe solid solution with a large photocurrent and a simple circuit configuration has been put into practical use, but this sensor has a slow optical response speed The plate (8 elements / mm, 1728 elements) had a drawback that the reading speed was slow at about 10 msec / line. Therefore, as shown in Japanese Patent Application No. 59-181751, for example, the structure shown in FIG. 3 has been improved to add bias light to enable high-speed reading.
すなわち、線状光源５で原稿６を照射し、その反射光３
を集束性ファイバアレイ２で光センサ１上に結像し原稿
の情報を読み取るに際して、光センサ１の光応答速度を
改善するために、別に設けた線状光源９の光をバイアス
光８として光センサ上に直接照射し、前述の原稿からの
反射光３に重畳することにより、光センサの応答速度を
速くして、高速度の画像読み取りを可能とする構造とな
っている。That is, the original 6 is illuminated by the linear light source 5 and the reflected light 3
In order to improve the optical response speed of the optical sensor 1 when an image is formed on the optical sensor 1 by the converging fiber array 2 and the information of the original is read, the light of the linear light source 9 provided separately is used as the bias light 8. By irradiating directly on the sensor and superimposing it on the reflected light 3 from the above-mentioned document, the response speed of the optical sensor is increased to enable high-speed image reading.
すなわち、光センサ１としてCdS,CdSeあるいは固溶体Cd
S−CdSeなどの光導電性薄膜を用いた場合の応答速度は5
msec程度であり、このセンサにバイアス光を附加して1/
2〜1/5程度に高速化できるものである。That is, as the optical sensor 1, CdS, CdSe or solid solution Cd
The response speed when using a photoconductive thin film such as S-CdSe is 5
It is about msec. 1 /
The speed can be increased to about 2 to 1/5.
発明が解決しようとする問題点 しかし、従来の構造では、線状光源が、原稿照射用５と
バイアス光用９と最低でも２本は必要であり、コストア
ップにつながる。さらに長時間使用時に光源の発熱が大
きく、光センサや光源（例えばLED光源を用いた場合）
に悪影響を与えるという問題があった。However, in the conventional structure, at least two linear light sources for the document irradiation 5 and the bias light 9 are required, which leads to an increase in cost. Furthermore, the light source generates a lot of heat when used for a long period of time, and an optical sensor or light source (for example, when using an LED light source)
There was a problem of adversely affecting the.
また、原稿照射用５とバイアス光用９の線状光源の主走
査方向のバラツキが同一でなく、さらに原稿照射後の反
射光３が集束性ファイバアレイ２の光量伝達率のバラツ
キと重なり、光センサ１上での光量バラツキが非常に大
きくなり、走査回路７での出力補正や、白黒の２値信号
のしきい値の設定が難しいという問題点もあった。Further, the variations in the main scanning direction of the linear light sources for the document irradiation 5 and the bias light 9 are not the same, and further, the reflected light 3 after the document irradiation overlaps with the variation in the light amount transmissivity of the converging fiber array 2, and There is also a problem that the variation in the amount of light on the sensor 1 becomes extremely large, and it is difficult to correct the output in the scanning circuit 7 and set the threshold value of the binary signal of black and white.
本発明は、簡単な構造でバイアス光が照射できかつ容易
に高速読み取りができる画像読取装置を提供することを
目的としている。An object of the present invention is to provide an image reading device that can irradiate bias light with a simple structure and can easily perform high-speed reading.
問題点を解決するための手段 本発明は、上記問題点を解決するため、光源と原稿との
間に僅かに反射成分を有する透明薄板を設け、光源を原
稿照射用とバイアス光用に兼用するものである。Means for Solving the Problems In order to solve the above problems, the present invention provides a transparent thin plate having a slight reflection component between a light source and a document, and uses the light source for both document irradiation and bias light. It is a thing.
作用 本発明は、上記の構成により、１つの光源で原稿照射用
とバイアス光用とを兼用でき、原稿照射光とバイアス光
との光量バラツキが相対的になくなるとともに原稿から
の反射光へのバイアス光の重畳により、バイアス光が定
常的に光キャリアのトラップを埋める効果があるため光
応答速度が速くなり高速読み取りが可能となる。Effect of the Invention According to the present invention, with the above-described configuration, one light source can be used for both original document irradiation and bias light, the variation in the light amount between the original irradiation light and the bias light is relatively eliminated, and the bias to the reflected light from the original document is obtained. By superimposing the light, the bias light has the effect of steadily filling the traps of the photocarriers, so that the photoresponse speed becomes faster and high-speed reading becomes possible.
実施例 第１図は本発明の画像読取装置の一実施例を示す副走査
方向の断面図である。CdS,CdSeや固溶体CdS−CdSeなど
の光導電体から成る光センサ１を主走査方向に例えば８
素子/mmの密度でA4版で1728素子形成し、この光センサ
１上に、線状光源５例えばLEDアレイなどで光センサ１
の分光感度に適した波長の光を用いて僅かに反射成分を
有する透明薄板４を介して原稿面６に照射する。原稿６
からの反射光３が、透明薄板４からの直接反射バイアス
光８とともに重畳して集束性ファイバアレイ２に入射
し、光センサ１上に反射光３を結像させるとともにバイ
アス光８を照射する構造である。Embodiment FIG. 1 is a sectional view in the sub-scanning direction showing an embodiment of the image reading apparatus of the present invention. An optical sensor 1 made of a photoconductor such as CdS, CdSe or a solid solution CdS-CdSe is arranged in the main scanning direction, for example, 8
1728 elements are formed in A4 size with a density of elements / mm, and a linear light source 5 such as an LED array is used to form the optical sensor 1 on the optical sensor 1.
The original surface 6 is irradiated with light having a wavelength suitable for the spectral sensitivity of the document through the transparent thin plate 4 having a slight reflection component. Manuscript 6
A reflected light 3 from the transparent thin plate 4 is superimposed on the bias light 8 directly reflected from the transparent thin plate 4 and is incident on the converging fiber array 2 to form an image of the reflected light 3 on the optical sensor 1 and to irradiate the bias light 8. Is.
ここで、バイアス光８の光強度は、CdS,CdSeあるいは固
溶体CdS−CdSeを主体として成る光センサの場合、反射
光３の光センサ１上の光強度を100とすれば、５〜100で
ある。第２図にはCdS0.2Se0.8光センサにおける相対バ
イアス光強度と相対光応答時間の関係を示す。相対バイ
アス光強度20〜70で充分な効果が得られる。Here, in the case of an optical sensor mainly composed of CdS, CdSe or solid solution CdS-CdSe, the light intensity of the bias light 8 is 5 to 100 when the light intensity of the reflected light 3 on the optical sensor 1 is 100. . Figure 2 shows the relationship between the relative bias light intensity and the relative light response time in the CdS 0.2 Se 0.8 optical sensor. A sufficient effect can be obtained with a relative bias light intensity of 20 to 70.
このように線状光源５と原稿６との間に僅かに反射成分
を有する透明薄板を設けることにより線状光源５を原稿
照射用とバイアス光用とに兼用できるのでコストダウン
ができるとともに、原稿６からの反射光３とバイアス光
８の光量バラツキが同一光源のため相対的に無視でき、
さらに集束性ファイバアレイ２の光量伝達率による影響
もなくなるので光センサ１で得られる信号の補正処理が
容易で、かつしきい値付近の白・黒などの判別を精度良
く行うことができる。さらにバイアス光の附加により副
走査方向の走査速度が向上するので、従来10msec/line
程度の速度が最高1msec/line程度まで高速読み取りが可
能となる。By thus providing the transparent thin plate having a slight reflection component between the linear light source 5 and the original 6, the linear light source 5 can be used for both the original irradiation and the bias light, so that the cost can be reduced and the original can be reduced. Since the light amount variations of the reflected light 3 from 6 and the bias light 8 are the same light source, they can be ignored relatively.
Further, since the influence of the light quantity transmissivity of the converging fiber array 2 is eliminated, the correction process of the signal obtained by the optical sensor 1 is easy and the white / black near the threshold value can be accurately discriminated. Furthermore, since the scanning speed in the sub-scanning direction is improved by adding bias light, the conventional 10 msec / line
High-speed reading is possible up to a speed of about 1 msec / line.
ここで光源としては、線状のLED,ELなどの固体光源，蛍
光灯などが用いられる。Here, as the light source, a linear LED, a solid-state light source such as EL, or a fluorescent lamp is used.
発明の効果 以上述べたように、本発明によれば、光源と原稿との間
に、僅かな反射成分を有する透明薄板を設けるという非
常に簡単な構造の画像読取装置とすることにより、光源
の光量バラツキによる不都合がなくなる。そしてその上
安価で実用的であり、しかも高速で画像が読み取れるの
で、極めて工業上有用である。As described above, according to the present invention, an image reading apparatus having a very simple structure in which a transparent thin plate having a slight reflection component is provided between a light source and a document, The inconvenience caused by the variation in the light quantity is eliminated. Further, it is inexpensive and practical, and the image can be read at high speed, which is extremely industrially useful.
第１図は本発明の一実施例における画像読取装置の断面
図、第２図はバイアス光量比と相対光応答時間の関係を
示す特性図、第３図は従来の画像読取装置の断面図であ
る。 １……光センサ、２……集束性ファイバアレイ、３……
反射光、４……僅かに反射成分を有する透明薄板、５…
…線状光源、６……原稿、８……バイアス光、９……バ
イアス光用光源。FIG. 1 is a sectional view of an image reading apparatus according to an embodiment of the present invention, FIG. 2 is a characteristic view showing a relationship between a bias light quantity ratio and a relative light response time, and FIG. 3 is a sectional view of a conventional image reading apparatus. is there. 1 ... Optical sensor, 2 ... Focusing fiber array, 3 ...
Reflected light, 4 ... Transparent thin plate with slight reflection component, 5 ...
... linear light source, 6 ... original, 8 ... bias light, 9 ... bias light source.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 由上 登 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (56)参考文献 実開 昭57−188461（ＪＰ，Ｕ) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Noboru Inoue Noboru Kagami 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References
Claims (2)
稿を照射する光源と、原稿からの反射光を光センサアレ
イに結像する集束性ファイバアレイを有し、前記光源と
原稿との間に僅かに反射成分を有する透明薄板を設け、
前記原稿からの反射光とともに、前記透明薄板からの反
射バイアス光が前記集束性ファイバアレイに入射する構
成とし、光センサ面において、原稿からの反射光成分の
強度の最大値を100とした時、前記透明薄板による反射
バイアス光成分の強度が５以上100以下であることを特
徴とする画像読取装置。1. A light sensor array formed on a substrate, a light source for illuminating a document, and a converging fiber array for focusing reflected light from the document on the photosensor array. A transparent thin plate with a slight reflection component is provided between
Along with the reflected light from the document, a configuration in which the reflected bias light from the transparent thin plate is incident on the converging fiber array, and the maximum value of the intensity of the reflected light component from the document on the photosensor surface is 100, An image reading apparatus, wherein the intensity of the reflected bias light component by the transparent thin plate is 5 or more and 100 or less.
CdS−CdSeを主体とする光センサで構成されていること
を特徴とする特許請求の範囲第１項記載の画像読取装
置。2. The optical sensor array is CdS, CdSe or a solid solution.
The image reading device according to claim 1, wherein the image reading device is composed of an optical sensor mainly composed of CdS-CdSe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60176617A JPH0795793B2 (en) | 1985-08-09 | 1985-08-09 | Image reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60176617A JPH0795793B2 (en) | 1985-08-09 | 1985-08-09 | Image reader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6236963A JPS6236963A (en) | 1987-02-17 |
| JPH0795793B2 true JPH0795793B2 (en) | 1995-10-11 |
Family
ID=16016701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60176617A Expired - Lifetime JPH0795793B2 (en) | 1985-08-09 | 1985-08-09 | Image reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0795793B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6244614Y2 (en) * | 1981-05-26 | 1987-11-26 |
-
1985
- 1985-08-09 JP JP60176617A patent/JPH0795793B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6236963A (en) | 1987-02-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4541713A (en) | Document size-detecting device of copying machine | |
| JPH0795793B2 (en) | Image reader | |
| JPS5846181B2 (en) | Close-contact image sensor | |
| JPH0968663A (en) | Scanning optics | |
| US5981944A (en) | Optical scanner which reduces the effects of external electrical noise and disturbing light | |
| JPH07147093A (en) | Optoelectronic memory system | |
| JP4285411B2 (en) | Contact image sensor | |
| JPH07108010B2 (en) | Image reader | |
| JPH0334765A (en) | Picture input device | |
| JPH0583024B2 (en) | ||
| JPS6130866A (en) | Image reading method and device | |
| JPS6236968A (en) | Original reader | |
| JPH0210965A (en) | Image sensor and input/output device | |
| JP3029656B2 (en) | Image reading device | |
| JPS58138069A (en) | Picture reader | |
| SU1065820A1 (en) | Device for producing copies | |
| KR870007467A (en) | Optical card device for recording and reproducing information | |
| JP2543427B2 (en) | Image processing device | |
| JP2503242B2 (en) | Contact image sensor element | |
| JPS6236960A (en) | Picture reader | |
| JPH02264562A (en) | Image reader | |
| JPH03149957A (en) | scanning reading device | |
| JPH04368967A (en) | Color copying machine | |
| JPH10177331A (en) | Document position detection device | |
| JPS6432569A (en) | Recording and reading in common head |