JPS583469A - Optical scanning device - Google Patents

Optical scanning device

Info

Publication number
JPS583469A
JPS583469A JP56101900A JP10190081A JPS583469A JP S583469 A JPS583469 A JP S583469A JP 56101900 A JP56101900 A JP 56101900A JP 10190081 A JP10190081 A JP 10190081A JP S583469 A JPS583469 A JP S583469A
Authority
JP
Japan
Prior art keywords
light
scanning
intensity
laser
output
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
JP56101900A
Other languages
Japanese (ja)
Inventor
Takao Nagaoke
永桶 隆雄
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56101900A priority Critical patent/JPS583469A/en
Publication of JPS583469A publication Critical patent/JPS583469A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024Details of scanning heads ; Means for illuminating the original
    • H04N1/028Details of scanning heads ; Means for illuminating the original for picture information pick-up
    • H04N1/02815Means for illuminating the original, not specific to a particular type of pick-up head

Abstract

PURPOSE:To monitor the amount of scanning light irradiated on a surface to be scanned, by measuring a loss of a laser light in a scanning optical system, through the detection of the intensity of emitting light from a laser light source and of the scanning light and the comparison of them provided with a circuit. CONSTITUTION:A emitted light from a laser light source 7 from a laser light source 7 having the detecting function of the intensity of emitted laser is detected at a photodiode 6 and converted into a level signal in response to the intensity of output of a monitor detecting circuit 11. On the other hand, the laser scanning light is detected at a photodiode 9, level conversion is made at a monitor detecting circuit 10 and compared with an output of the monitor detecting circuit 11 at a differential circuit 12. The output of the differential circuit 12 is amplified 12', outputted to an alarm connecting terminal 13, where a signal is outputted when the laser scanning light is decreased for a prescribed value or more in comparison with the emitted light.

Description

【発明の詳細な説明】 本発明は、レーザ光を光源とする光走、査装置に係)、
特に光源の出力光の強度をレーザ光検出手段で検出し、
該レーザ光検出手段からの出力をレーザ光出力制御回路
に入力することによシ、光源の出力光の強度を被走査位
置の強度が一定の強度となる機制御する光走査装置に関
する。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical scanning device using a laser beam as a light source);
In particular, the intensity of the output light of the light source is detected by a laser light detection means,
The present invention relates to an optical scanning device that controls the intensity of output light from a light source so that the intensity at a scanned position is constant by inputting the output from the laser light detection means to a laser light output control circuit.

従来のレーザ光を用いた光走章装置におけるレーザ光源
の出力光の強度をし、−ザ出力制御回路により制御する
方式としては・例えばL7−921J y夕装置の感光
ドラム面一の被走査面上に置かれた第1のし]ザ、光検
出手譚匹よって被走車兜上での走査光の強度”+検出し
、該レーザ光検出手段、から走f元の強反に応じて制御
する方式がある。
In a conventional optical scanning device using a laser beam, the intensity of the output light of the laser light source is controlled by a laser output control circuit. The first laser beam placed on the top of the vehicle detects the intensity of the scanning light on the vehicle's helmet by the light detection means, and the laser light detection means detects the intensity of the scanning light on the vehicle's helmet, and the laser light detection means detects the intensity of the scanning light on the head of the vehicle. There are ways to control it.

本発明の目的は、上述した従来の欠点を取除くべく、レ
ーザ光の走査光学系における損失程度を測定し検出し得
、且つ、既存の走査面における光強度を検出する手段を
利用でき、更に、レーザ光源から被走査面までの光路で
損失されるレーザ光の量を正確に検出できる光走査装置
を提供するにある。
It is an object of the present invention, in order to eliminate the above-mentioned conventional drawbacks, to be able to measure and detect the degree of loss of laser light in a scanning optical system, and to utilize existing means for detecting light intensity in a scanning plane. Another object of the present invention is to provide an optical scanning device that can accurately detect the amount of laser light lost in the optical path from a laser light source to a surface to be scanned.

上記目的を達成するため、本発明の光走査装置は、第1
のレーザ光検出手段によ多走査光学系により走査される
走査光の強雇を検出し、レーザ光源の出力光の強度を制
御する光走査装置において、源の発射強度とを比較する
回路とを備えたことを特徴とするものである。
In order to achieve the above object, the optical scanning device of the present invention provides a first
In an optical scanning device that detects the force of scanning light scanned by a multi-scanning optical system by a laser light detection means and controls the intensity of output light of a laser light source, a circuit that compares the intensity with the emission intensity of the source is provided. It is characterized by the fact that it is equipped with

以下、実施例を用いて本発明を詳述する。Hereinafter, the present invention will be explained in detail using Examples.

図面は、本発明をレーザプリンタ装置に適用した場合の
実施例のブロック図である。
The drawing is a block diagram of an embodiment in which the present invention is applied to a laser printer device.

図において、1は感光ドラム、2はミラー、3は結像し
/ズ、4は多面体叱う−、5は光変調器、6と9はフォ
トダイオード、7はレーザ光源、8はスリット、10と
11はモニタ検出回路、12と15は差分回路、12′
 と15′は増幅器、13はアラーム接続端子、14は
基準値設定回路、16は交流駆動回路、17はバイアス
電流設定−路である。
In the figure, 1 is a photosensitive drum, 2 is a mirror, 3 is an image forming lens, 4 is a polyhedron, 5 is a light modulator, 6 and 9 are photodiodes, 7 is a laser light source, 8 is a slit, 10 and 11 are monitor detection circuits, 12 and 15 are differential circuits, and 12'
and 15' are amplifiers, 13 is an alarm connection terminal, 14 is a reference value setting circuit, 16 is an AC drive circuit, and 17 is a bias current setting path.

モニタ検出回路10.11は、それぞれフォトダイオー
ド9.6の出力信号をピークホールドする回路である。
The monitor detection circuits 10.11 are circuits that peak-hold the output signals of the photodiodes 9.6, respectively.

図において、−光変調器5によって変調駆動されること
によりレーザ光源7よシ出力されるレーザ光は、多面体
オフ−4,結像レンズ3を経て感光ドラム1の面上を走
査される。該感光ドラムl上での走査光の強度はミI)
−2,スリシト8を通してフォトダイオード゛91Cよ
って検出される。#フォトダイオード9の出力は、モニ
タ検出回路10によって走査光の強度に応じたレベルの
信号に変換される。このモニタ検出回路100出力レベ
ルは、基準値設定回路14からの出力レベルと量分回路
15で比較される。該差分回路1sの出力は増幅器1!
s′ によって増幅され、交流駆動回路16及びバイア
ス電流設定回路1フにライ−ドパツクされる。このバイ
アス電流設定回路17の出力がレーず光源7へつながれ
ている。
In the figure, laser light outputted from a laser light source 7 by being modulated and driven by a light modulator 5 is scanned over the surface of a photosensitive drum 1 via a polyhedron off-4 and an imaging lens 3. The intensity of the scanning light on the photosensitive drum I)
-2, detected by photodiode 91C through screen 8. #The output of the photodiode 9 is converted by the monitor detection circuit 10 into a signal whose level corresponds to the intensity of the scanning light. The output level of the monitor detection circuit 100 is compared with the output level from the reference value setting circuit 14 in the quantity dividing circuit 15. The output of the differential circuit 1s is the amplifier 1!
The signal is amplified by s' and read-packed to the AC drive circuit 16 and bias current setting circuit 1. The output of this bias current setting circuit 17 is connected to the laser light source 7.

上記の回路によれば、フォトダイオード9で検出される
感光ドラム1上での走査光の強度が、基準値設定回路1
40出力レベルより小さい場合社、バイアス電流設定回
路11の出力電流を大きくすることによ)レーザ光源γ
の出力光あ強度を大きくシ、まえ、逆に鋏走査党の強度
が基準値よ)大自い場合は、バイアス電流設定回路17
の出力を―めるヒとによシレーず光@1o出力党を弱め
、レーザ光源7の出力光強度を一定にできる。
According to the above circuit, the intensity of the scanning light on the photosensitive drum 1 detected by the photodiode 9 is determined by the reference value setting circuit 1.
(If the output current is smaller than 40 output level, increase the output current of the bias current setting circuit 11)
Increase the output light intensity (on the contrary, if the intensity of the scissors scanning is above the reference value), set the bias current setting circuit 17.
By increasing the output of the laser light source 7, the output of the laser light source 7 can be made constant by weakening the output power of the laser beam.

本発明においては、発射レーザ光強度の検出機能を持つ
レーザ光f17を使用し、モニタ検出回路11、差分回
路12.増幅器121.アラーム接続端子13を殻ける
In the present invention, a laser beam f17 having a function of detecting the emitted laser beam intensity is used, and a monitor detection circuit 11, a difference circuit 12. Amplifier 121. Remove the alarm connection terminal 13.

フォトダイオード6は該レーザ光源7の中に設けられ、
発射レーザ光強度を検出する。該フォトダイオード・の
出力状、前記モニタ検出回路10と同一構成のモニタ検
出回路11で出力強度に応じたレベル信号に変換され、
前記フォトダイオード9の出力を変換した4J+−夕検
出回路10のレベル信号と、差分回路12により比較さ
れる。
A photodiode 6 is provided in the laser light source 7,
Detect the emitted laser light intensity. The output state of the photodiode is converted into a level signal according to the output intensity by a monitor detection circuit 11 having the same configuration as the monitor detection circuit 10,
A difference circuit 12 compares the output of the photodiode 9 with a level signal of a 4J+- evening detection circuit 10 .

該差分回路12の出力社増@911’で増幅され、アラ
ーム接続端子13に出力される。
The output signal of the differential circuit 12 is amplified by the output terminal 911' and output to the alarm connection terminal 13.

上記の回路によって、フォトダイオードによって検出さ
れるレープ光源テの発射レーザ光の強度と、フォトダイ
オード9にようて検出される感光ドラム1上の走査光の
強度との差分値が、アラーム接続端子に出力されb0ア
ラーム按続端子には差分値が所定値以上となった場合に
信号を発する回路が設けられる。例えば、この信号をア
ラーム表示器に接続し、所定値以上となった場合点灯す
ることによシ、走査光学系の汚れをレーザ光源が過大駆
動される前に知ることができる。
By the above circuit, the difference value between the intensity of the emitted laser light from the lep light source TE detected by the photodiode and the intensity of the scanning light on the photosensitive drum 1 detected by the photodiode 9 is sent to the alarm connection terminal. The output b0 alarm connection terminal is provided with a circuit that issues a signal when the difference value exceeds a predetermined value. For example, by connecting this signal to an alarm indicator and turning it on when it exceeds a predetermined value, it is possible to detect dirt in the scanning optical system before the laser light source is overdriven.

以上述べた本発明の実施例においては、以下のような効
果がある。
The embodiments of the present invention described above have the following effects.

(1)感光ドラムを用いるため、感光ドラム上の潜儂を
現儂するためのトナーが感光ドラムのまわ夛に飛散して
、走査光学系のレーザ光路が汚れやすい−、装装置おり
ては、走査光学系の汚れを測定することが大きな効果を
あげる。
(1) Since a photosensitive drum is used, the toner used to imprint the latent image on the photosensitive drum scatters around the photosensitive drum, and the laser light path of the scanning optical system is easily contaminated. Measuring contamination of the scanning optical system can be very effective.

(7)既存の感光ドラム藺における走査光強度を検出す
る手段を、走査光学系での汚れの測定に利用できる。
(7) Existing means for detecting the intensity of scanning light on the photosensitive drum can be used to measure dirt in the scanning optical system.

(3)走査光強度を検出する第1のレーザ光検出手段を
感光ドラム面上におくことによシ、光学系のみ外らず感
光ドラム面上から光源迄の光路で損失される量を正確に
検出できる。
(3) By placing the first laser beam detection means on the photosensitive drum surface to detect the scanning light intensity, it is possible to accurately measure the amount of loss not only in the optical system but also in the optical path from the photosensitive drum surface to the light source. can be detected.

また、上記レーザ光源としては、ガスレーザ光源★た祉
半導体し−ず光源の両者を用いることができる。ガスレ
ーザの場合、レーず発射光を分光してレーザ光源後部よ
シレーザ光出力が得られるので、とのレーず光を利用し
て発射強度を検出できる。また、半導体レーザ光源を用
いる場合、レーザ光出力部と共に発射レーザ光の強度検
出素子が内蔵されているものが重態されておp、この内
蔵される強度検出素子を発射しレーず強度を測定するも
のとして利用することができる。
Further, as the laser light source, both a gas laser light source and a semiconductor solid light source can be used. In the case of a gas laser, the laser light output can be obtained from the rear of the laser light source by dividing the laser emitted light, so the emitted intensity can be detected using the laser light. In addition, when using a semiconductor laser light source, it is important to have a built-in intensity detection element for emitted laser light together with the laser light output part, and the built-in intensity detection element is used to emit laser light and measure the laser intensity. It can be used as something.

尚、本発明は上記実施例におけるレーザプ+7 y夕装
置に限らず、レーザ光を光源として光走査を行なう装置
であれば、上記実施例での効果と同じ効果が得られる。
It should be noted that the present invention is not limited to the laser printer device in the above embodiment, but can obtain the same effects as in the above embodiment with any device that performs optical scanning using a laser beam as a light source.

以上説明したように本発明によれば、走査光学系でのレ
ーず光損失度合を測定することができるので、走査光学
系でのレーザ光損失が原因となうて被走査面上に照射さ
れる走査光の強度が減少した場合に、アラ−五等によっ
てオペレータに走査光学系におけるレーザ光損失度が大
きいことを知らせることができ、引いて紘、レーザ光源
の過大駆動をも未然に防止できる効果を奏する。
As explained above, according to the present invention, it is possible to measure the degree of laser light loss in the scanning optical system. When the intensity of the scanning light decreases, an alarm can notify the operator that the laser light loss in the scanning optical system is large, and this can also prevent overdriving of the laser light source. be effective.

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

図面は、本発明の一実施例のブロック図を示す。 図において、1は感光ドラム、3は結像レンズ、4社多
面体ぐラー、5は光変調器、6と9社フォトダイオード
、7はレーザ光源、10と11は峰エタ検出回路、12
と15は差分回路、1フはバイアス電流設定回路である
The drawing shows a block diagram of one embodiment of the invention. In the figure, 1 is a photosensitive drum, 3 is an imaging lens, 4-manufactured polyhedral roller, 5 is an optical modulator, 6 and 9-manufactured photodiodes, 7 is a laser light source, 10 and 11 are peak etch detection circuits, 12
and 15 are differential circuits, and 1f is a bias current setting circuit.

Claims (3)

【特許請求の範囲】[Claims] (1)  レープ光源と、走査光学系を持ち、レニザ光
源から発射される光で被走査面を走査する光走査装置に
おいて、走査光学系により走査される走査光の強度を検
出する第1のレーザ光検出子えることを特徴とする光走
査装置。
(1) In an optical scanning device that has a lep light source and a scanning optical system and scans a surface to be scanned with light emitted from the laser light source, a first laser that detects the intensity of the scanning light scanned by the scanning optical system. An optical scanning device characterized by having a photodetector.
(2)  上記第1のレーザ光検出手段は、レーザ光に
よって走査される被走査面上に設けられ、該被走査面上
での走査光の強度を検出するものであることを特徴とす
る特許請求の範囲第1項記載の光走査装置。
(2) A patent characterized in that the first laser beam detection means is provided on a surface to be scanned by the laser beam, and detects the intensity of the scanning light on the surface to be scanned. An optical scanning device according to claim 1.
(3)  上記光走査装置拡、被走査面として光走査さ
手段は、走査光が照射される走査直線の感光ドラム面の
延長面上に置かれた建う−と、この建う−で反射される
走査光のみを抽出オるスリットと、スリットを通し下介
し、反射光を受光し該反射光強度を検出するフォトダイ
オードとからなることを特徴とする特許請求の範囲第(
1)項又は第(2)項記載の党走李装置。
(3) The light scanning means used as the surface to be scanned by the optical scanning device is placed on the extension surface of the photosensitive drum surface in the scanning straight line on which the scanning light is irradiated, and the light is reflected by this surface. Claim No. 1, characterized in that it consists of a slit that extracts only the scanning light that is scanned, and a photodiode that passes through the slit and receives reflected light and detects the intensity of the reflected light.
Party running device as described in paragraph 1) or paragraph (2).
JP56101900A 1981-06-30 1981-06-30 Optical scanning device Pending JPS583469A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56101900A JPS583469A (en) 1981-06-30 1981-06-30 Optical scanning device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56101900A JPS583469A (en) 1981-06-30 1981-06-30 Optical scanning device

Publications (1)

Publication Number Publication Date
JPS583469A true JPS583469A (en) 1983-01-10

Family

ID=14312785

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56101900A Pending JPS583469A (en) 1981-06-30 1981-06-30 Optical scanning device

Country Status (1)

Country Link
JP (1) JPS583469A (en)

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