JPS6259462A - Semiconductor laser scanner - Google Patents
Semiconductor laser scannerInfo
- Publication number
- JPS6259462A JPS6259462A JP60198764A JP19876485A JPS6259462A JP S6259462 A JPS6259462 A JP S6259462A JP 60198764 A JP60198764 A JP 60198764A JP 19876485 A JP19876485 A JP 19876485A JP S6259462 A JPS6259462 A JP S6259462A
- Authority
- JP
- Japan
- Prior art keywords
- semiconductor laser
- light
- laser
- light beam
- strength
- 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
Links
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
- Facsimile Scanning Arrangements (AREA)
- Facsimile Image Signal Circuits (AREA)
- Semiconductor Lasers (AREA)
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Printer (AREA)
Abstract
Description
【発明の詳細な説明】
(技術分野)
本発明はレーザービームプリンタ等に適用される半導体
レーザ走査装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a semiconductor laser scanning device applied to a laser beam printer or the like.
(従来技術)
第2図に示すように、記録体のような静電潜像担持体1
が矢印方向に回転していて、その周囲に帯電器2、現像
器3、転写器4およびクリーニングユニット5が配置さ
れ、情報信号によって変調された光ビームを偏向春6お
よび反射ミラー7を介して静電潜像担持体表面(以下記
録面とよぶ)1に投射することにより得た静電潜像を現
像器3で可視像化して転写器4により転写紙8に記録す
る。いわゆるレーザビームプリンタが実用に供せられて
いる。(Prior Art) As shown in FIG. 2, an electrostatic latent image carrier 1 such as a recording medium
is rotating in the direction of the arrow, and a charger 2, a developer 3, a transfer device 4, and a cleaning unit 5 are arranged around it, and a light beam modulated by an information signal is transmitted through a deflection spring 6 and a reflection mirror 7. An electrostatic latent image obtained by projecting onto the electrostatic latent image carrier surface (hereinafter referred to as recording surface) 1 is visualized by a developing device 3 and recorded on a transfer paper 8 by a transfer device 4. So-called laser beam printers are in practical use.
ところで、かかるレーザビームプリンタにおいて、光ビ
ームの強度変調を行わせる方法として、半導体レーザが
、注入電流に応じて出力光量が変化するI−L特性を有
することに着目して、半導体レーザへの注入電流を制御
して出力光量を変える光ビームの強度変調が知られてい
る。By the way, as a method for modulating the intensity of a light beam in such a laser beam printer, focusing on the fact that a semiconductor laser has an I-L characteristic in which the amount of output light changes depending on the injection current, injection into a semiconductor laser is performed. Intensity modulation of a light beam is known in which the amount of output light is changed by controlling the current.
しかしながら、半導体レーザのI −L特性は温度依存
性が大きく更に半導体レーザの組成の不均一により前記
特性が素子によって大きく異なるので前記注入電流によ
る出力光量の制御は非常に困難であった。However, the I-L characteristics of a semiconductor laser have a strong temperature dependence, and furthermore, the characteristics vary greatly depending on the device due to the non-uniformity of the composition of the semiconductor laser, so it has been very difficult to control the amount of output light by the injection current.
(目 的)
本発明は、上記問題点を解決するためになされたもので
あって、光ビームの強度変調を容易に行なえる半導体レ
ーザ走査装置の提供を目的とする。(Objective) The present invention was made in order to solve the above-mentioned problems, and an object of the present invention is to provide a semiconductor laser scanning device that can easily perform intensity modulation of a light beam.
(構 成)
第1図は本発明の半導体レーザ走査装置の一例を示す構
成図である。この図において、符号11a。(Configuration) FIG. 1 is a configuration diagram showing an example of a semiconductor laser scanning device of the present invention. In this figure, reference numeral 11a.
11b、・・・llnはそれぞれ半導体レーザを示して
おり、各半導体レーザlla、 ILL・・・llnは
それぞれ駆動回路L2a、 12b、・・・12nによ
って独立してオン・オフされるようになっている。各半
導体レーザ11a。11b, . . . lln indicate semiconductor lasers, and each of the semiconductor lasers lla, ILL, . There is. Each semiconductor laser 11a.
11b、・・・・からの光ビームRa、Rb・・・・は
結像光学系たるハーフミラ−又はハーフプリズムMa、
Mb・・・・により透過又1よ反射して一本の光ビーム
R。The light beams Ra, Rb, . . . from 11b, .
A light beam R is transmitted by Mb and reflected by Mb.
に整合される。この場合図中最右端に位置する半導体レ
ーザllnよりの光ビームRnは反射鏡Mnによって反
射され他の光ビームRa、 Rh・・・・と同じく前記
光ビームROに整合させられることはいうまでもない。is consistent with In this case, it goes without saying that the light beam Rn from the semiconductor laser lln located at the rightmost end in the figure is reflected by the reflecting mirror Mn and is aligned with the light beam RO like the other light beams Ra, Rh... do not have.
そしてこの最終的に整合された光ビームRoは偏向器6
(第2図参照)を介して記録面又は表示面を走査する。Then, this finally aligned light beam Ro is transferred to a deflector 6
(See FIG. 2) to scan the recording surface or display surface.
次に、光ビームの強度変調を行なうには、例えば、半導
体レーザllaをオンさせ、他の半導体レーザ11b、
・・・・llnをオフさせたり、あるいは半導体レーザ
llaおよびllbをオンさせ他たオフさせたりすれば
よい。また、変調強度は各半導体レーザLla、 ll
b、・・・・Llnの電流値の設定値を変えることによ
り自在に変えることができ、各点灯時の出力光量が一定
となるように制御することは容易である。更に、この制
御法は、光量検出回路からの誤差量を半導体レーザ駆動
回路に帰還させる公知の方法を用いることができ、光ビ
ームの強度変調を容易に行わせることができる。Next, in order to perform intensity modulation of the light beam, for example, turn on the semiconductor laser lla, and turn on the other semiconductor lasers 11b,
. . . lln may be turned off, or semiconductor lasers lla and llb may be turned on and the others may be turned off. In addition, the modulation intensity of each semiconductor laser Lla, ll
b, . . . Lln can be freely changed by changing the set value of the current value, and it is easy to control the output light amount at each lighting time to be constant. Furthermore, this control method can use a known method of feeding back the amount of error from the light amount detection circuit to the semiconductor laser drive circuit, making it possible to easily modulate the intensity of the light beam.
(効 果)
以上の説明で明らかなように、本発明は光ビームの強度
変調を容易に行うことができ、かつレーザビームプリン
タにおいて多段階の階調を表現することが可能となる効
果を有するものである。(Effects) As is clear from the above explanation, the present invention has the effect of easily modulating the intensity of a light beam and making it possible to express multiple gradations in a laser beam printer. It is something.
第1図は本発明の一実施例を示す構成図、第2図はレー
ザビームプリンタを示す概略構成図である。
11a、llb、・・・1ln−・半導体レーザ、 1
2a、12b、”・・12n・・・・・駆動回路、M
a r M b 7・・・Mn・・・・結像光学系+
Ra、Rb、・・・Rn・・・・各光ビーム、Ro・・
・・整合された最終の光ビーム。FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a schematic block diagram showing a laser beam printer. 11a, llb, . . . 1ln-・semiconductor laser, 1
2a, 12b, "...12n...Drive circuit, M
a r M b 7...Mn...Imaging optical system+
Ra, Rb,...Rn...Each light beam, Ro...
...aligned final light beam.
Claims (1)
より記録面上又は表示面上に結像する半導体レーザ走査
装置において、複数個の半導体レーザ光源と、これらの
半導体レーザ光源をそれぞれ独立にオン・オフ可能な駆
動回路と、前記複数個の半導体レーザ光源からの光ビー
ムを整合させる結像光学系とを備えたことを特徴とする
半導体レーザ走査装置。In a semiconductor laser scanning device in which a modulated light beam from a semiconductor laser is imaged onto a recording surface or a display surface by an imaging optical system, a plurality of semiconductor laser light sources are used, and each of these semiconductor laser light sources is turned on independently. - A semiconductor laser scanning device comprising: a drive circuit that can be turned off; and an imaging optical system that aligns light beams from the plurality of semiconductor laser light sources.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60198764A JPS6259462A (en) | 1985-09-09 | 1985-09-09 | Semiconductor laser scanner |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60198764A JPS6259462A (en) | 1985-09-09 | 1985-09-09 | Semiconductor laser scanner |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6259462A true JPS6259462A (en) | 1987-03-16 |
Family
ID=16396552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60198764A Pending JPS6259462A (en) | 1985-09-09 | 1985-09-09 | Semiconductor laser scanner |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6259462A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63241576A (en) * | 1987-03-30 | 1988-10-06 | Canon Inc | Image recorder |
JPH07250209A (en) * | 1994-03-14 | 1995-09-26 | Ricoh Co Ltd | Optical recorder using semiconductor laser array |
JP2006012888A (en) * | 2004-06-22 | 2006-01-12 | Fuji Photo Film Co Ltd | Combined laser light irradiation method and equipment thereof |
-
1985
- 1985-09-09 JP JP60198764A patent/JPS6259462A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63241576A (en) * | 1987-03-30 | 1988-10-06 | Canon Inc | Image recorder |
JPH07250209A (en) * | 1994-03-14 | 1995-09-26 | Ricoh Co Ltd | Optical recorder using semiconductor laser array |
JP2006012888A (en) * | 2004-06-22 | 2006-01-12 | Fuji Photo Film Co Ltd | Combined laser light irradiation method and equipment thereof |
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