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JPH01279670A - Synchronizing signal generating circuit with display function of synchronized state of laser printer - Google Patents

Synchronizing signal generating circuit with display function of synchronized state of laser printer

Info

Publication number
JPH01279670A
JPH01279670A JP63110153A JP11015388A JPH01279670A JP H01279670 A JPH01279670 A JP H01279670A JP 63110153 A JP63110153 A JP 63110153A JP 11015388 A JP11015388 A JP 11015388A JP H01279670 A JPH01279670 A JP H01279670A
Authority
JP
Japan
Prior art keywords
circuit
output
synchronization signal
photoelectric sensor
laser printer
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
JP63110153A
Other languages
Japanese (ja)
Inventor
Hisashi Naganuma
長沼 久資
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 JP63110153A priority Critical patent/JPH01279670A/en
Publication of JPH01279670A publication Critical patent/JPH01279670A/en
Pending legal-status Critical Current

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  • Laser Beam Printer (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Facsimile Transmission Control (AREA)

Abstract

PURPOSE:To facilitate to adjust the fitting position of a photoelectric sensor by providing an LED to be driven by the differentiated output of the photoelectric sensor, and adjusting the fitting position of the photoelectric sensor according to the intensity of the emitted light of the LED. CONSTITUTION:A photodiode 1 of the photoelectric sensor is fitted at a position for generating a synchronizing signal, and its output is amplified by a current voltage conversion circuit 2, and is inputted to a synchronizing signal generating part 3. On the other hand, the output of the current voltage conversion circuit 2 is differentiated by a differentiation circuit 4, and is inputted to a peak hold circuit 5, and is amplified by a voltage current conversion circuit 6, and lights the LED 7. If the position of the photodiode 1 is adjusted so that the brightness of this LED 7 comes to be a maximum value, the proper synchronizing signal can be obtained.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明はレーザプリンタの同期信号発生回路、さらに詳
しく云えば、水平方向のレーザスキャンに対し画像出力
の同期をとるため設けられた光電式センサの取付位置の
調整方法を考慮した同期信号発生回路に関する。
Detailed Description of the Invention (Industrial Application Field) The present invention relates to a synchronization signal generation circuit for a laser printer, and more specifically, to a photoelectric sensor provided for synchronizing image output with respect to horizontal laser scanning. The present invention relates to a synchronization signal generation circuit that takes into account a method of adjusting the mounting position of a synchronous signal generator.

(従来の技術) 高速性、静寂性、印字品質等に優れていることがらレー
ザプリンタが用いられている。
(Prior Art) Laser printers are used because they are excellent in high speed, quietness, printing quality, etc.

レーザプリンタは水平方向のレーザスキャンに対し、画
像出力の同期をとるための光電式センサを備えている。
A laser printer is equipped with a photoelectric sensor for synchronizing image output with respect to horizontal laser scanning.

従来、とのセンサの取付位置はオシロスコープ等の計測
器によV信号出力を目視確認しつつ。
Conventionally, the sensor mounting position was determined by visually checking the V signal output using a measuring instrument such as an oscilloscope.

調整が行なわれていた。Adjustments were being made.

(発明が解決しようとする課題) 従来のセンサ取付位置調整方法はこのように必ず計測器
を用いて行なっていたのでセンサの故障による交換ある
いは調整の際の保守作業が煩雑であるという欠点があっ
た。
(Problem to be Solved by the Invention) The conventional method for adjusting the sensor mounting position always uses a measuring instrument as described above, which has the disadvantage of complicating maintenance work when replacing or adjusting the sensor due to failure. Ta.

本発明の目的はセンサ故障等による交換作業等において
、センサの取付位置を調整することが容易なように同期
状態を表示する機能ケ備えた同期信号発生回路ケ提供す
ることにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a synchronization signal generating circuit having a function of displaying the synchronization state so that the mounting position of the sensor can be easily adjusted during replacement work due to sensor failure or the like.

(課題を解決するための手段) 前記目的を達成するために本発明ζこよるレーザプリン
タの同期状態表示機能を有する同期信号発生回路は水平
方向のレーザスキャンに対し画像出力の同期を採るため
設けられた光電式センサの出力より同期信号を発生する
レーザプリンタの同期信号発生回路において、前記光電
式センサ出力を微分する微分回路と、前記微分回路出力
全保持するピークホールド回路と、前記ピークホールド
回路出力によって駆動される電圧電流変換回路と、前記
電圧電流変換回路の負荷として接続されるLEDとを設
け、前記it式センサの取付位置調整を前記L EDの
発!+7)強弱によって行なうように構成しである。
(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a synchronization signal generation circuit having a synchronization state display function of a laser printer is provided to synchronize image output with respect to horizontal laser scanning. A synchronization signal generation circuit for a laser printer that generates a synchronization signal from the output of a photoelectric sensor that has been detected, includes a differentiating circuit that differentiates the output of the photoelectric sensor, a peak hold circuit that holds all the outputs of the differentiator circuit, and the peak hold circuit. A voltage-current conversion circuit driven by the output and an LED connected as a load of the voltage-current conversion circuit are provided, and the installation position of the IT-type sensor can be adjusted using the output of the LED! +7) It is structured so that it is performed by strength and weakness.

さらに他の発明として光電式センサ出力を微分する微分
回路と、前記微分回路出力により起動されるスピーカ駆
動回路と、前記スピーカ駆動回路の負荷として接続され
るスピーカと全設け。
Still another invention includes a differentiation circuit for differentiating a photoelectric sensor output, a speaker drive circuit activated by the output of the differentiation circuit, and a speaker connected as a load of the speaker drive circuit.

前記光電式センサの取付位fit調整を前記スピーカ出
力の強弱によって行なうように構成しである。
The mounting position of the photoelectric sensor is adjusted by adjusting the strength of the output from the speaker.

さらに今一つの発明として光電式センサ出力により作ら
れた同期信号によりリトリガされ、この同期信号の規定
の周期より長い周期の出力を発生するリトリガブルワン
ショット回路と。
Furthermore, as another invention, there is provided a retriggerable one-shot circuit that is retriggered by a synchronization signal generated by a photoelectric sensor output and generates an output with a cycle longer than the prescribed cycle of this synchronization signal.

前記リトリガブルワンショット回路出力により起動され
るLED駆動回路と、前記LED駆動回路の負荷として
接続されるLEDとを設け、前記LEDの発光の連続、
不連続によって規定の同期の同期信号の発生を検出する
ように構成しである。
An LED drive circuit activated by the retriggerable one-shot circuit output and an LED connected as a load of the LED drive circuit are provided, and the LED continues to emit light,
The apparatus is configured to detect the occurrence of a synchronization signal of prescribed synchronization by discontinuity.

(実施例) 以下、図面を参照して本発明をさらに詳しく説明する。(Example) Hereinafter, the present invention will be explained in more detail with reference to the drawings.

第1図は本発明によるレーザプリンタの同期状態表示機
能を有する同期信号発生回路の実施例を示す回路図であ
る。
FIG. 1 is a circuit diagram showing an embodiment of a synchronization signal generation circuit having a synchronization state display function for a laser printer according to the present invention.

この実施例はLEDの発光の強弱によって同期状態を表
示しようとするものである。
In this embodiment, the synchronization state is displayed by the strength of the LED light emission.

光電式センサであるホトダイオード1が同期信号発生の
ための位置に取付けられる。
A photodiode 1, which is a photoelectric sensor, is mounted at a position for generating a synchronization signal.

ホトダイオード1の出力は電流電圧変換回路2により増
幅され、同期信号発生部3に入力される。同期信号発生
部3では波形整形され、同期信号が出力される。
The output of the photodiode 1 is amplified by a current-voltage conversion circuit 2 and input to a synchronization signal generation section 3. The synchronizing signal generator 3 shapes the waveform and outputs a synchronizing signal.

一方、電流電圧変換回路2の出力は微分回路4により微
分され、ピークホールド回路5に入力される。ピークホ
ールド回路5によって保持されたピーク値は電圧電流変
換回路6により増幅され、L、ED7を発光させる。
On the other hand, the output of the current-voltage conversion circuit 2 is differentiated by a differentiating circuit 4 and input to a peak hold circuit 5. The peak value held by the peak hold circuit 5 is amplified by the voltage-current conversion circuit 6, causing the L and ED 7 to emit light.

このLED7の明るさが最大値になるようにホトダイオ
ード1の取付位置を調整すれば適正な同期信号?得るこ
とができる。
If you adjust the mounting position of photodiode 1 so that the brightness of this LED 7 reaches its maximum value, will it be possible to obtain an appropriate synchronization signal? Obtainable.

第2図は本発明の他の実施例を示す回路図である。この
実施例は音声の強弱によって位tX整をしようとするも
のである。
FIG. 2 is a circuit diagram showing another embodiment of the present invention. This embodiment attempts to adjust the position tX according to the strength of the voice.

光電式センサであるホトダイオード1は同期信号発生の
ための位置に取付けられる。ホトダイオード1の出力は
電流電圧変換回路2により増幅され、同期信号発生部3
に入力される。同期信号発生部3では波形整形され同期
信号が出力される。
A photodiode 1, which is a photoelectric sensor, is mounted at a position for generating a synchronization signal. The output of the photodiode 1 is amplified by the current-voltage conversion circuit 2, and the output is amplified by the current-voltage conversion circuit 2.
is input. The synchronizing signal generator 3 shapes the waveform and outputs a synchronizing signal.

一方、電流電圧変換回路2の出力は微分回路4にも入力
される。
On the other hand, the output of the current-voltage conversion circuit 2 is also input to the differentiating circuit 4.

微分回路4の出力はこの後、電圧電流変換回路8に入力
され、スピーカ駆動回路9を起動する。
The output of the differentiating circuit 4 is then input to the voltage-current converting circuit 8, and the speaker driving circuit 9 is activated.

スピーカ10は、これζこよって駆動されるが、レーザ
プリンタにおける画像出力のための同期信号は1msの
周期で発生するので、1幻りの音を出力する。
The speaker 10 is driven by this ζ, but since the synchronizing signal for image output in the laser printer is generated at a cycle of 1 ms, it outputs one phantom sound.

このスピーカ10の音が最大になるようにホトダイオー
ド1の取付位置を調整すれば、適正な同期信号を得るこ
とができる。
By adjusting the mounting position of the photodiode 1 so that the sound of the speaker 10 is maximized, an appropriate synchronization signal can be obtained.

なお、スイッチ11は必要でないとき、スピーカ駆動を
停止させるものである。
Note that the switch 11 is used to stop driving the speaker when it is not necessary.

第3図は本発明のさらlこ他の実施例を示す回路図であ
る。
FIG. 3 is a circuit diagram showing another embodiment of the present invention.

この実施例はLEDI 9の発光状態によって同期信号
位置調整時、正しい周期の同期信号を検出するためのも
のである。
This embodiment is for detecting a synchronization signal with a correct period when adjusting the synchronization signal position based on the light emitting state of the LEDI 9.

実際のセンサ位置調整では第1実施例か、または第2実
施例と組合せて用いることとなる。
In actual sensor position adjustment, the first embodiment or the second embodiment will be used in combination.

ホトダイオード12および13はSO8信号と呼ばれる
スタート信号を発生させるもので、ホトダイオード】2
の出力と13の出力とは予じめ相互にタイムラグが与え
られている。
Photodiodes 12 and 13 are for generating a start signal called SO8 signal, and photodiode]2
The output of 1 and the output of 13 are given a time lag with respect to each other in advance.

ホトダイオード12の出力は、電流電圧変換回路15に
よって、また、ホトダイオード13の出力は電流電圧変
換回路14によってそれぞれ増幅される。
The output of the photodiode 12 is amplified by a current-voltage conversion circuit 15, and the output of the photodiode 13 is amplified by a current-voltage conversion circuit 14.

これら電流電圧変換回路14および15の出力の交叉す
る点が、タイミング信号検出回路16によって得られる
The point where the outputs of these current-voltage conversion circuits 14 and 15 intersect is obtained by a timing signal detection circuit 16.

タイミング信号検出回路16の出力はリトリガブルワン
ショット回路17に入力され波形整形される。
The output of the timing signal detection circuit 16 is input to a retriggerable one-shot circuit 17 and subjected to waveform shaping.

リトリガブルワンショット回路17はタイミング信号検
出回路16の出力によりリトリガされLED駆動回路1
8全駆動し、LEDI9を点灯させる。
The retriggerable one-shot circuit 17 is retriggered by the output of the timing signal detection circuit 16 and the LED drive circuit 1
8 is fully driven and LED 9 is lit.

リトリガブルワンショット回路17の出力パルス長はレ
ーザタイミング信号周期よりわずかに長くなるように設
定されているので、適正な周期のレーザタイミング信号
のときのみ、LEDI9が連続発光する。これによって
ホトダイオード12および13が正しい取付位置にある
か否かを判断することができる。
Since the output pulse length of the retriggerable one-shot circuit 17 is set to be slightly longer than the laser timing signal period, the LEDI 9 emits light continuously only when the laser timing signal has an appropriate period. This allows it to be determined whether the photodiodes 12 and 13 are in the correct mounting position.

LEDI9が連続発光せず途切れる場合はレーザタイミ
ング信号の周期が適正値より長くなっていることがわか
る。
If the LEDI 9 does not emit light continuously but is interrupted, it can be seen that the period of the laser timing signal is longer than the appropriate value.

(発明の効果9 以上、説明したようtこ本発明によれば、光電式センサ
の取付位置調整を、同期信号発生回路が有する同期状態
表示回路によって行なうことができる。したがって従来
のようにオシロスコープ等の測定器を用いなくてもよい
ので、レーザプリンタの保守が簡便になるという効果が
ある。
(Effect 9 of the Invention As explained above, according to the present invention, the mounting position of the photoelectric sensor can be adjusted using the synchronization state display circuit included in the synchronization signal generation circuit. Since there is no need to use a measuring device, the maintenance of the laser printer becomes easier.

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

第1図は本発明によるレーザプリンタの同期状態表示機
能を有する同期信号発生回路の実施例を示す回路図、第
2図は本発明の他の実施例を示す回路図、第3図は本発
明のさらlこ他の実施例を示す回路図である。 1.12.13・・・ホトダイオード 2.14.15・・電流電圧変換回路 3・・同期信号発生部 4・・微分回路 5・・・ピークホールド回路 6.8・・・電圧電流変換回路 7.19・・・LED 9・・・スピーカ駆動回路 1υ・・・スピーカ 1]・・・スイッチ 16・・・タイミング信号検出回路 17・・・リトリガブルワンショット回路18・・・L
EDHA動回路 特許出願人  日本電気株式会社
FIG. 1 is a circuit diagram showing an embodiment of a synchronization signal generation circuit having a synchronization state display function for a laser printer according to the present invention, FIG. 2 is a circuit diagram showing another embodiment of the present invention, and FIG. 3 is a circuit diagram showing an embodiment of the present invention. FIG. 3 is a circuit diagram showing another embodiment of the present invention. 1.12.13...Photodiode 2.14.15...Current-voltage conversion circuit 3...Synchronizing signal generation section 4...Differentiating circuit 5...Peak hold circuit 6.8...Voltage-current conversion circuit 7 .19...LED 9...Speaker drive circuit 1υ...Speaker 1]...Switch 16...Timing signal detection circuit 17...Retriggerable one-shot circuit 18...L
EDHA dynamic circuit patent applicant NEC Corporation

Claims (3)

【特許請求の範囲】[Claims] (1)水平方向のレーザスキャンに対し画像出力の同期
を採るため設けられた光電式センサの出力より同期信号
を発生するレーザプリンタの同期信号発生回路において
、前記光電式センサ出力を微分する微分回路と、前記微
分回路出力を保持するピークホールド回路と、前記ピー
クホールド回路出力によつて駆動される電圧電流変換回
路と、前記電圧電流変換回路の負荷として接続されるL
EDを設け、前記光電式センサの取付位置調整を前記L
EDの発光の強弱によって行なうように構成したことを
特徴とするレーザプリンタの同期状態表示機能を有する
同期信号発生回路。
(1) In a synchronization signal generation circuit of a laser printer that generates a synchronization signal from the output of a photoelectric sensor provided to synchronize image output with respect to horizontal laser scanning, a differentiation circuit that differentiates the output of the photoelectric sensor , a peak hold circuit that holds the differential circuit output, a voltage-current conversion circuit driven by the output of the peak-hold circuit, and an L connected as a load of the voltage-current conversion circuit.
An ED is provided to adjust the mounting position of the photoelectric sensor.
1. A synchronization signal generation circuit having a synchronization state display function for a laser printer, characterized in that the synchronization signal generation circuit is configured to display the synchronization state according to the intensity of light emission of an ED.
(2)水平方向のレーザスキャンに対し画像出力の同期
を採るため設けられた光電式センサの出力より同期信号
を発生するレーザプリンタの同期信号発生回路において
、前記光電式センサ出力を微分する微分回路と、前記微
分回路出力により起動されるスピーカ駆動回路と、前記
スピーカ駆動回路の負荷として接続されるスピーカとを
設け、前記光電式センサの取付位置調整を前記スピーカ
出力の強弱によつて行なうように構成したことを特徴と
するレーザプリンタの同期状態表示機能を有する同期信
号発生回路。
(2) In a synchronization signal generation circuit of a laser printer that generates a synchronization signal from the output of a photoelectric sensor provided to synchronize image output with respect to horizontal laser scanning, a differentiation circuit that differentiates the output of the photoelectric sensor. and a speaker drive circuit activated by the differential circuit output, and a speaker connected as a load of the speaker drive circuit, and the mounting position of the photoelectric sensor is adjusted by adjusting the strength of the speaker output. What is claimed is: 1. A synchronization signal generation circuit having a synchronization state display function for a laser printer.
(3)水平方向のレーザスキャンに対し画像出力の同期
を採るため設けられた光電式センサの出力より同期信号
を発生するレーザプリンタの同期信号発生回路において
、前記光電式センサ出力により作られた同期信号により
リトリガされ、この同期信号の規定の周期より長い周期
の出力を発生するリトリガブルワンショット回路と、前
記リトリガブルワンショット回路出力により起動される
LED駆動回路と、前記LED駆動回路の負荷として接
続されるLEDとを設け、前記LEDの発光の連続、不
連続によつて規定の周期の同期信号の発生を検出するよ
うに構成したことを特徴とするレーザプリンタの同期状
態表示機能を有する同期信号発生回路。
(3) In a synchronization signal generation circuit of a laser printer that generates a synchronization signal from the output of a photoelectric sensor provided to synchronize image output with respect to horizontal laser scanning, the synchronization generated by the output of the photoelectric sensor A retriggerable one-shot circuit that is retriggered by a signal and generates an output with a cycle longer than the prescribed cycle of this synchronization signal, an LED drive circuit that is activated by the output of the retriggerable one-shot circuit, and a load of the LED drive circuit. A synchronization device having a synchronization state display function for a laser printer, characterized in that the laser printer is provided with a connected LED, and is configured to detect generation of a synchronization signal of a prescribed period based on continuous or discontinuous light emission of the LED. Signal generation circuit.
JP63110153A 1988-05-06 1988-05-06 Synchronizing signal generating circuit with display function of synchronized state of laser printer Pending JPH01279670A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63110153A JPH01279670A (en) 1988-05-06 1988-05-06 Synchronizing signal generating circuit with display function of synchronized state of laser printer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63110153A JPH01279670A (en) 1988-05-06 1988-05-06 Synchronizing signal generating circuit with display function of synchronized state of laser printer

Publications (1)

Publication Number Publication Date
JPH01279670A true JPH01279670A (en) 1989-11-09

Family

ID=14528396

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63110153A Pending JPH01279670A (en) 1988-05-06 1988-05-06 Synchronizing signal generating circuit with display function of synchronized state of laser printer

Country Status (1)

Country Link
JP (1) JPH01279670A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001006484A1 (en) * 1999-07-14 2001-01-25 Sony Corporation Current drive circuit and display comprising the same, pixel circuit, and drive method
US7193591B2 (en) 1999-07-14 2007-03-20 Sony Corporation Current drive circuit and display device using same, pixel circuit, and drive method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001006484A1 (en) * 1999-07-14 2001-01-25 Sony Corporation Current drive circuit and display comprising the same, pixel circuit, and drive method
US6859193B1 (en) 1999-07-14 2005-02-22 Sony Corporation Current drive circuit and display device using the same, pixel circuit, and drive method
US7193591B2 (en) 1999-07-14 2007-03-20 Sony Corporation Current drive circuit and display device using same, pixel circuit, and drive method
US7379039B2 (en) 1999-07-14 2008-05-27 Sony Corporation Current drive circuit and display device using same pixel circuit, and drive method
US7388564B2 (en) 1999-07-14 2008-06-17 Sony Corporation Current drive circuit and display device using same, pixel circuit, and drive method

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