JPS62278064A - Laser diode head capable of modulation - Google Patents

Laser diode head capable of modulation

Info

Publication number
JPS62278064A
JPS62278064A JP61121569A JP12156986A JPS62278064A JP S62278064 A JPS62278064 A JP S62278064A JP 61121569 A JP61121569 A JP 61121569A JP 12156986 A JP12156986 A JP 12156986A JP S62278064 A JPS62278064 A JP S62278064A
Authority
JP
Japan
Prior art keywords
light
laser
laser diode
modulated
modulators
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
JP61121569A
Other languages
Japanese (ja)
Inventor
Sakae Asano
浅野　栄
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP61121569A priority Critical patent/JPS62278064A/en
Publication of JPS62278064A publication Critical patent/JPS62278064A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To make uniform quantities of light emitted from laser diodes, by providing a modulator for outputting laser beam by modulating the beam, and a slitted plate permitting only primary modulated beam of modulated beam to pass therethrough. CONSTITUTION:A plurality of laser diodes 1-1n output laser beam respectively to a plurality of modulators 4-4n. A slitted plate 12 is provided on the output side of the modulators 4-4n to output only specified modulated beam to a print drum 13. The laser beam is outputted from a light-outputting part 6 after being modulated through a light-inputting part 5 of the modulator 4, the modulation being conducted according to a modulating signal 8 with an amplitude inversely proportional to the light emission output of the laser diode 1 which signal is inputted through a modulating signal inputting part 7. Of the modulated beam, only one of primary beam 10 is directed to the print drum 13 while the others are cut off, by the fuction of the slitted plate 12. Thus, the light emission outputs of the laser diodes are compensated for by the modulators, thereby making uniform the light outputs.

Description

【発明の詳細な説明】 ３、発明の詳細な説明 し産業上の利用分野〕 本発明は可変調レーザダイオードヘッド、特にノンイン
パクトプリンタのプリントヘッドに関す゛・−゛ヘ　−
、− る。[Detailed Description of the Invention] 3. Detailed Description of the Invention and Field of Industrial Application] The present invention relates to a tunable laser diode head, particularly a print head of a non-impact printer.
,-ru.

〔従来の技術〕[Conventional technology]

従来ノンインパクトプリンタのプリントヘッドにおいて
は多数のレーザダイオードをアレイ状に配設し、各レー
ザダイオード全シフトレジスタからの信号に従って順次
に発光させている。In the print head of a conventional non-impact printer, a large number of laser diodes are arranged in an array, and each laser diode sequentially emits light in accordance with signals from all shift registers.

し発明が解決しようとする問題点］ したがってこのようなレーザダイオードヘッドにおいて
は個々のレーザダイオードに共通の電圧を加え同一パル
ス幅の信号を印加していたので、各レーザダイオードの
特性により発光量にバラツキが生じ、プリンタヘッドと
しての歩留りが低いという欠点がある。[Problems to be Solved by the Invention] Therefore, in such a laser diode head, since a common voltage is applied to each laser diode and a signal with the same pulse width is applied, the amount of light emitted varies depending on the characteristics of each laser diode. There are disadvantages in that variations occur and the yield as a printer head is low.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

本発明が解決しようとする問題点、換言すれば本発明の
目的は個々のレーザダイオードの発光量のバラツキを変
調器によって均等化することによって上記の欠点を改善
した可変調レーザダイオードへ、ドを提供することにあ
る。The problem to be solved by the present invention, in other words, the purpose of the present invention is to provide a tunable laser diode that improves the above-mentioned drawbacks by equalizing the variations in the amount of light emitted from individual laser diodes by using a modulator. It is about providing.

〔問題点を解決するための手段〕[Means for solving problems]

−２−′ 本発明の可変調レーザダイオードヘッドは、レーザ光を
発光して送出するレーザダイオードと、前記レーザ光を
入力し、前記レーザダイオードの発光量に反比例する変
調信号に従って前記レーザ光を変調した変調光を送出す
る変調器と、前記変調光のなかの一次変調光のみを通過
させるスリットを有するスリット板とを具備して構成さ
れる。、〔実施例〕 以下、本発明による可変調レーザダイオードヘッドにつ
いて図面を参照して説明する。-2-' The tunable laser diode head of the present invention includes a laser diode that emits and sends out laser light, and inputs the laser light and modulates the laser light in accordance with a modulation signal that is inversely proportional to the amount of light emitted by the laser diode. The device includes a modulator that sends out modulated light, and a slit plate that has a slit that allows only the primary modulated light of the modulated light to pass through. , [Example] Hereinafter, a tunable laser diode head according to the present invention will be described with reference to the drawings.

第１図は本発明の一実施例を示す構成図である。FIG. 1 is a block diagram showing an embodiment of the present invention.

同図において複数個のレーザダイオード１〜１ｎは複数
個の変調器４〜４ｎにそれぞれレーザ光を送出して−る
。変調器４〜４ｎの光出力側にはスリット板１７１設置
し、特定の変調光（後述する。）のみをプリントドラム
１３に送出する。In the figure, a plurality of laser diodes 1 to 1n send out laser beams to a plurality of modulators 4 to 4n, respectively. A slit plate 171 is installed on the light output side of the modulators 4 to 4n, and only specific modulated light (described later) is sent to the print drum 13.

レーザダイオードｌが莞するレーザ光は変調器４の光入
力部５を経て変調されて光出力部６から送出される。こ
のとき変調信号入力部７からレーザダイオードｌの発光
量に反比例した条幅の変調信号８に従って、変調器４は
光入力部５から入力したレーザ光を変調する。変調光は
Ｏ次光９を中心として同図の上下方向に１次元１０．２
次元１１゜・・・・・・が分散している。スリット板１
２は上記の変ｍ光のなかから１次元１０の一つだけをプ
リントドラム１３に照射し、他の変調光をすべて遮断す
る。The laser light emitted by the laser diode 1 is modulated through the optical input section 5 of the modulator 4 and sent out from the optical output section 6. At this time, the modulator 4 modulates the laser light input from the optical input section 5 in accordance with the modulation signal 8 from the modulation signal input section 7 whose width is inversely proportional to the amount of light emitted from the laser diode 1. The modulated light is one-dimensional 10.2 in the vertical direction of the figure with the O-order light 9 as the center.
Dimension 11°... is dispersed. Slit plate 1
2 irradiates the print drum 13 with only one of the one-dimensional modulated lights 10 out of the m-variable lights described above, and blocks all other modulated lights.

レーザダイオード１ａ〜ｌｎ、ｂよび変調器４１〜４ｎ
Ｋついてもそれぞれ上記と同様に動作する。Laser diodes 1a to ln, b and modulators 41 to 4n
Even when K is added, the same operations as above are performed.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、変調器によってレーザダ
イオードの出力光量を補償しているので、レーザダイオ
ードヘッドの光出力を均等化するという効果がある。し
たがってレーザダイオードヘッドの歩留９１に向上させ
ることができる。As described above, the present invention uses a modulator to compensate for the amount of light output from the laser diode, and therefore has the effect of equalizing the light output from the laser diode head. Therefore, the yield of laser diode heads can be improved to 91%.

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

第１図は本発明の一実施例を示す構成図である。 １’ｌａ・・・・・・・Ｉｎ・・・・・・発光ダイオー
ド、４１１・・・・・・４ｎ・・・・・・変調盤、５・
旧・・光入力部％６・・・・・・光出力部、１２・・・
・・・スリット、１３・・・・・・プリントドラム。 第　ｆ　図 ／　−ｆａ−−−−ｆ轢−−−−シーす°ｒｌオードｄ
−−−−−−４ｎ−−−一笈等り番 ５−−−−光人〃等 、ｇ−−−−ｆ：六ガ詳 ／２−−−−ズソ・ソトネ反 ／３−−−−アソントドヲムFIG. 1 is a block diagram showing an embodiment of the present invention. 1'la...In...Light emitting diode, 411...4n...Modulation board, 5.
Old...Light input part %6...Light output part, 12...
...Slit, 13...Print drum. FIG.
---------4n----Ichito Tori number 5----Mitsuto etc., g----f: Rokuga details/2----Zuso Sotone anti/3-- --Asonto Doomu

Claims (1)

【特許請求の範囲】 レーザ光を発光して送出するレーザダイオードと、 前記レーザ光を入力し、前記レーザダイオードの発光量
に反比例する変調信号に従って前記レーザ光を変調した
変調光を送出する変調器と、前記変調光のなかの一次変
調光のみを通過させるスリットを有するスリット板と、 を具備したことを特徴とする可変調レーザダイオードヘ
ッド。[Scope of Claims] A laser diode that emits and sends out laser light, and a modulator that receives the laser light and modulates the laser light according to a modulation signal that is inversely proportional to the amount of light emitted from the laser diode and sends out modulated light. A tunable laser diode head comprising: and a slit plate having a slit that allows only primary modulated light among the modulated light to pass through.
JP61121569A 1986-05-26 1986-05-26 Laser diode head capable of modulation Pending JPS62278064A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61121569A JPS62278064A (en) 1986-05-26 1986-05-26 Laser diode head capable of modulation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61121569A JPS62278064A (en) 1986-05-26 1986-05-26 Laser diode head capable of modulation

Publications (1)

Publication Number Publication Date
JPS62278064A true JPS62278064A (en) 1987-12-02

Family

ID=14814477

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61121569A Pending JPS62278064A (en) 1986-05-26 1986-05-26 Laser diode head capable of modulation

Country Status (1)

Country Link
JP (1) JPS62278064A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5270734A (en) * 1991-08-23 1993-12-14 Eastman Kodak Company Auto-focus detector mask
WO1996011110A1 (en) * 1994-10-05 1996-04-18 Rohm Co., Ltd. Led printing head

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5270734A (en) * 1991-08-23 1993-12-14 Eastman Kodak Company Auto-focus detector mask
WO1996011110A1 (en) * 1994-10-05 1996-04-18 Rohm Co., Ltd. Led printing head
US5896162A (en) * 1994-10-05 1999-04-20 Rohm Co., Ltd. Led printing head
CN1073511C (en) * 1994-10-05 2001-10-24 罗姆股份有限公司 LED printing head

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