JP2919038B2 - Shading correction device - Google Patents
Shading correction deviceInfo
- Publication number
- JP2919038B2 JP2919038B2 JP2256826A JP25682690A JP2919038B2 JP 2919038 B2 JP2919038 B2 JP 2919038B2 JP 2256826 A JP2256826 A JP 2256826A JP 25682690 A JP25682690 A JP 25682690A JP 2919038 B2 JP2919038 B2 JP 2919038B2
- Authority
- JP
- Japan
- Prior art keywords
- shading correction
- correction device
- light
- reflector
- cathode tube
- 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
Landscapes
- Optical Systems Of Projection Type Copiers (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
- Control Of Exposure In Printing And Copying (AREA)
- Facsimile Scanning Arrangements (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、放電管の長手方向の光量むらを補正し、画
像読取り装置等の均一光源を得ることのできるシェーデ
ィング補正装置に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shading correction device that corrects uneven light amount in a longitudinal direction of a discharge tube and obtains a uniform light source such as an image reading device.
（従来の技術） 一般に、イメージスキャナー等の画像読取り装置で
は、第６図に示すように、印刷物等の走査対象物１を光
源２を使って走査し、該走査対象物１の文字等をレンズ
３を経て受光検出部としてラインイメージセンサ４を結
像させ、該走査対象物１の幅方向の一端から他端の光情
報を順次電気情報に変換して出力するようになってい
る。(Prior Art) Generally, in an image reading apparatus such as an image scanner, as shown in FIG. 6, a scanning target 1 such as a printed matter is scanned using a light source 2, and a character or the like of the scanning target 1 is converted into a lens. An image is formed on the line image sensor 4 as a light receiving detection unit through 3, and optical information from one end to the other end in the width direction of the scanning target 1 is sequentially converted into electrical information and output.
このような用途においてラインイメージセンサ４に
は、その幅方向の一端から他端にかけて光量のむらがな
いように走査対象物１からの反射光を受光させる必要が
ある。In such an application, it is necessary for the line image sensor 4 to receive the reflected light from the scanning object 1 so that the light amount is not uneven from one end to the other end in the width direction.
しかるに従来の光源２では、走査対象物１の幅方向の
両端で暗くなると共に、レンズ３の収差によりこの傾向
がさらに顕著となり、ラインイメージセンサ４では、第
７図（横軸が走査対象物１の幅方向位置Ｐ、縦軸が光量
に基づく出力電圧Ｖを表わす）に示すように、幅方向の
中央において受ける光量が多く、幅方向の両端に近付く
につれて受ける光量が減少するという問題点があった。However, in the conventional light source 2, the darkness occurs at both ends in the width direction of the scanning target 1, and this tendency becomes more remarkable due to the aberration of the lens 3. In the line image sensor 4, FIG. As shown in the width direction position P and the vertical axis represents the output voltage V based on the light amount, the light amount received at the center in the width direction is large, and the light amount received decreases as approaching both ends in the width direction. Was.
このような像の光量のむらをなくすシェーディング補
正として、従来は第８図に示すようにレンズ３の前にシ
ェーディング補正スリット板５を配置し、該シェーディ
ング補正スリット板５には第９図に示すように中央が狭
幅で両端に近付くにつれて徐々に広幅になるシェーディ
ング補正スリット６を設け、該スリット６の中央では通
過光量を制限し、該スリット６の両端に近付くにつれて
通過光量を増加させるようにすることが行われている。Conventionally, as shading correction for eliminating such unevenness in the light amount of an image, a shading correction slit plate 5 is disposed in front of the lens 3 as shown in FIG. 8, and the shading correction slit plate 5 is provided as shown in FIG. A shading correction slit 6 is provided in which the center is narrow and gradually widens as approaching both ends. The amount of transmitted light is limited at the center of the slit 6, and the amount of transmitted light is increased as approaching both ends of the slit 6. That is being done.
（発明が解決しようとする課題） しかしながら、このようなシェーディング補正方法で
は、シェーディング補正スリット板５で通過光量を制限
しているので、受光検出部に達する全体の光量が減少
し、得られる画像が全体的に暗くなるという問題点があ
った。(Problems to be Solved by the Invention) However, in such a shading correction method, since the amount of light passing through the shading correction slit plate 5 is limited, the total amount of light reaching the light receiving detection unit is reduced, and an obtained image is not obtained. There was a problem that it became dark as a whole.
本発明の目的は、光量を減らさずにシェーディングの
補正を行うことができるシェーディング補正装置を提供
することにある。An object of the present invention is to provide a shading correction device that can perform shading correction without reducing the amount of light.
（課題を解決するための手段） 本発明に係るシェーディング補正装置は、放電管の長
手方向に沿って反射体を設けたシェーディング補正装置
において、放電管の両端で走査対象物の背面側に夫々独
立した反射体を冷陰極管ホルダーと一体的に形成したこ
とを備えた構成としたものである。(Means for Solving the Problems) A shading correction device according to the present invention is a shading correction device in which a reflector is provided along the longitudinal direction of a discharge tube. The reflector is formed integrally with the cold-cathode tube holder.
（作用） このように、本発明に係るシェーディング補正装置
は、放電管の両端で走査対象物の背面側に夫々独立した
反射体を電極ホルダと一体的に設けたので、放電管の光
量を長手方向に均一とすることができる。(Operation) As described above, in the shading correction device according to the present invention, independent reflectors are provided integrally with the electrode holder on both sides of the discharge tube on the back side of the object to be scanned. Direction can be uniform.
また、反射体を電極ホルダーと一体としたので組立の
際の位置決めを容易にすることができる。In addition, since the reflector is integrated with the electrode holder, positioning during assembly can be facilitated.
（実施例） 以下、添付図面に従って本発明の実施例を説明する。
第１図は、本発明の一実施例を示す正面図、第２図は、
その平面図、第３図は、第１図のＡ−Ａ線端面図であ
る。図において、本発明のシェーディング補正装置は、
冷陰極管ホルダ10と、この冷陰極管ホルダ10と一体的に
形成された反射体11と断面が一様な円形の冷陰極管12と
から構成されている。(Example) Hereinafter, an example of the present invention is described according to an accompanying drawing.
FIG. 1 is a front view showing an embodiment of the present invention, and FIG.
FIG. 3 is a plan view and FIG. 3 is an end view taken along line AA of FIG. In the figure, the shading correction device of the present invention
It comprises a cold cathode tube holder 10, a reflector 11 formed integrally with the cold cathode tube holder 10, and a circular cold cathode tube 12 having a uniform cross section.
ここで、冷陰極管ホルダ10と反射体11とは、白色シリ
コーンゴム等から成る合成樹脂から形成されている。冷
陰極管ホルダ10は、冷陰極管12の端部を囲蔽する円管状
に形成されるとともに、上面端部に電線13を通過させる
ための孔14が穿設されている。反射体11は、円管を半割
にした半円部11aと軸線長手方向に沿って先細りとなる
よう直線的に切断した先細部11bとから構成されてい
る。本実施例においては、先細部11bは、第２図に示す
平面図において、直線的に変化するように形成されてい
る。Here, the cold cathode tube holder 10 and the reflector 11 are formed of a synthetic resin made of white silicone rubber or the like. The cold-cathode tube holder 10 is formed in a circular tube shape surrounding the end of the cold-cathode tube 12, and has a hole 14 at the upper end thereof through which the electric wire 13 passes. The reflector 11 is composed of a semicircular portion 11a obtained by dividing a circular tube into half, and a tapered portion 11b cut linearly so as to be tapered along the longitudinal direction of the axis. In this embodiment, the tapered portion 11b is formed so as to change linearly in the plan view shown in FIG.
次に、以上のような構成のシェーディング補正装置の
組立手順について説明する。まず、電線13を孔14から差
込み、冷陰極管12の電極と半田付けする。然る後、電線
13を引き出しつつ、冷陰極管12を冷陰極管ホルダ10に挿
着する。Next, an assembling procedure of the shading correction device having the above configuration will be described. First, the electric wire 13 is inserted through the hole 14 and soldered to the electrode of the cold cathode tube 12. After that, the electric wire
While pulling out 13, the cold cathode tube 12 is inserted into the cold cathode tube holder 10.
ここで、孔14の穿設された円状突部14aは、反射体11
の先細部の中心に位置しているので、反射体11の位置調
整が容易である。Here, the circular projection 14a in which the hole 14 is formed is
Since the reflector 11 is located at the center of the tapered portion, the position of the reflector 11 can be easily adjusted.
第５図は、第１図乃至第４図に示すシェーディング補
正装置を用いてラインイメージセンサで受光した実験例
における受光出力の波形図を示したものであって、横軸
が走査対象物１の幅方向位置Ｐ、縦軸が光量に基づく出
力電圧Ｖを表わす。この図から明らかなように、本発明
のこの実験例によれば、冷陰極管12の長手方向のいずれ
の箇所間でも差のない受光出力が得られており、有効に
シェーディング補正が行われていることがわかる。FIG. 5 shows a waveform diagram of a light receiving output in an experimental example in which light was received by a line image sensor using the shading correction device shown in FIGS. 1 to 4, wherein the horizontal axis represents the scanning object 1. The width direction position P and the vertical axis represent the output voltage V based on the light amount. As is clear from this figure, according to this experimental example of the present invention, a light receiving output having no difference was obtained between any portions in the longitudinal direction of the cold cathode tube 12, and shading correction was effectively performed. You can see that there is.
このようにシェーディング補正された補正光源を用
い、第６図に示すようなイメージスキャナーで、印刷物
等の走査対象物１を走査し、その走査対象物１の文字等
の情報をレンズ３を経てラインイメージセンサ４に結像
させ、走査対象物１の幅方向の一端から他端まで明暗の
むらのない光情報を順次電気情報に変換して出力し、そ
の出力に基づき図示しないCRT等の表示装置に明暗のむ
らのない画像を表示することができる。Using the corrected light source that has been subjected to the shading correction in this way, an image scanner as shown in FIG. 6 scans a scanning target 1 such as a printed matter, and transmits information such as characters of the scanning target 1 through a lens 3 via a lens 3. An image is formed on the image sensor 4, and light information from one end to the other end in the width direction of the scanning target 1 is sequentially converted into electrical information and output, which is then output to a display device such as a CRT (not shown) based on the output. An image without uneven brightness can be displayed.
なお、このようなシェーディング補正装置は、イメー
ジスキャナーの光源以外に、複写機の光源、ファクシミ
リの光源、ショーウィンドーの光源等としても利用でき
ることは勿論である。Such a shading correction device can of course be used as a light source of a copying machine, a light source of a facsimile, a light source of a show window, and the like, in addition to the light source of the image scanner.
（発明の効果） 以上詳細に説明したように、本発明に係るシェーディ
ング補正装置によれば、反射体の端部が直線的に変化し
ているので放電管の長手方向に亘り均一光源とすること
ができる。また、放電管の電極ホルダと反射体とを一体
的に構成したので、反射体の位置決めが容易である。更
に電極ホルダと一体型とすることにより、取付けの手数
が省略できるとともに、調整も微調整で済む。(Effect of the Invention) As described above in detail, according to the shading correction device of the present invention, since the end of the reflector changes linearly, a uniform light source is provided along the longitudinal direction of the discharge tube. Can be. Further, since the electrode holder of the discharge tube and the reflector are integrally formed, positioning of the reflector is easy. Further, by integrating the electrode holder with the electrode holder, the number of mounting steps can be reduced and fine adjustment can be performed.
このような均一光源を画像形成装置に使用した場合に
は、S/N比を大きくすることができる。When such a uniform light source is used in an image forming apparatus, the S / N ratio can be increased.
更に、平面図上で直線状にカットしたので加工が容易
である。Furthermore, since it is cut straight in a plan view, processing is easy.
第１図は本発明の一実施例を示すシェーディング補正装
置の正面図、第２図は、その平面図、第３図は第１図の
Ａ−Ａ線端面図、第４図は冷陰極管ホルダの縦断面図、
第５図は本発明によるシェーディング補正の一実験例に
おける受光量を示す出力波形図、第６図はイメージスキ
ャナーの構成例を示す斜視図、第７図はシェーディング
補正をしてない受光量の出力波形図、第８図は従来のシ
ェーディング補正の仕方を示す光学系の側面図、第９図
は従来のシェーディング補正スリット板を示す平面図で
ある。 10……冷陰極管ホルダ、11……反射体、 12……冷陰極管、13……電線、14……孔。FIG. 1 is a front view of a shading correction device showing one embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is an end view taken along line AA of FIG. 1, and FIG. Vertical sectional view of the holder,
FIG. 5 is an output waveform diagram showing the amount of received light in an experimental example of shading correction according to the present invention, FIG. 6 is a perspective view showing a configuration example of an image scanner, and FIG. 7 is an output of the amount of received light without shading correction. FIG. 8 is a side view of an optical system showing a conventional shading correction method, and FIG. 9 is a plan view showing a conventional shading correction slit plate. 10: Cold cathode tube holder, 11: Reflector, 12: Cold cathode tube, 13: Electric wire, 14: Hole.
Claims (1)
シェーディング補正装置において、放電管の両端で走査
対象物の背面側に夫々独立した反射体を冷陰極管ホルダ
ーと一体的に形成したことを特徴とするシェーディング
補正装置。In a shading correction device provided with a reflector along the longitudinal direction of a discharge tube, independent reflectors are formed integrally with a cold cathode tube holder at both ends of the discharge tube on the back side of an object to be scanned. A shading correction device characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2256826A JP2919038B2 (en) | 1990-09-28 | 1990-09-28 | Shading correction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2256826A JP2919038B2 (en) | 1990-09-28 | 1990-09-28 | Shading correction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04136835A JPH04136835A (en) | 1992-05-11 |
| JP2919038B2 true JP2919038B2 (en) | 1999-07-12 |
Family
ID=17297969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2256826A Expired - Lifetime JP2919038B2 (en) | 1990-09-28 | 1990-09-28 | Shading correction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2919038B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11346293A (en) | 1998-06-01 | 1999-12-14 | Nec Corp | Light source fixing member and original reading device |
| JP6500392B2 (en) * | 2014-11-07 | 2019-04-17 | 岩崎電気株式会社 | Light irradiation device |
-
1990
- 1990-09-28 JP JP2256826A patent/JP2919038B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04136835A (en) | 1992-05-11 |
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