JPS59101220U

JPS59101220U - optical scanning device

Info

Publication number: JPS59101220U
Application number: JP19894482U
Authority: JP
Inventors: 今元　雅巳
Original assignee: 横河電機株式会社
Priority date: 1982-12-24
Filing date: 1982-12-24
Publication date: 1984-07-07

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来の光走査装置の一例を示す構成図、第２図
は本考案に係る装置の一例を示す構成ブロック図、第３
図は第２図におけるクロック信号発生回路の詳細な構成
を示−すブロック図、第４図はその動作説明図、第５図
は光ビームの振れ角θと　　　　。周期Ｔとの関係を示す線図、第６図はプログラマブルカ
ウンタに印加される分周比データと、時間　　−との関
係を示す線図、第７図は本考案の他の実施例を示す構成
ブロック図、第８図は第７図装置において、光ビームの
振れ角θと光源パワーＰとの関係を示す線図である。１・・・光源、２・・・レンズ、３・・・回転多面鏡、
５・・・感光ドラム、６・・・光源駆動回路、７・・・
バッファメモリ回路、８・・・アドルスカウンタ、９・
・・クロック信号発生回路、９４・・・電圧制御発振回
路、９５・・・プログラマブルカウンタ。FIG. 1 is a block diagram showing an example of a conventional optical scanning device, FIG. 2 is a block diagram showing an example of a device according to the present invention, and FIG.
This figure is a block diagram showing the detailed configuration of the clock signal generation circuit in FIG. 2, FIG. 4 is an explanatory diagram of its operation, and FIG. 5 is a diagram showing the deflection angle θ of a light beam. FIG. 6 is a diagram showing the relationship between the frequency division ratio data applied to the programmable counter and time. FIG. 7 is a diagram showing the relationship between the frequency division ratio data applied to the programmable counter and time. FIG. The block diagram, FIG. 8, is a diagram showing the relationship between the deflection angle θ of the light beam and the light source power P in the apparatus shown in FIG. 1...Light source, 2...Lens, 3...Rotating polygon mirror,
5... Photosensitive drum, 6... Light source drive circuit, 7...
buffer memory circuit, 8... address counter, 9.
. . . Clock signal generation circuit, 94 . . . Voltage controlled oscillation circuit, 95 . . . Programmable counter.

Claims

[Scope of utility model registration request]

(1) In an optical scanning device that projects and scans a light beam onto a photosensitive means, a clock signal for controlling the writing period of data corresponding to one dot on the photosensitive means is transmitted through a phase control circuit that includes a programmable counter in the loop. An optical scanning device characterized in that frequency division ratio data is obtained from a locked loop (PLL) voltage controlled oscillator, and frequency division ratio data given to the programmable counter is controlled by a predetermined function corresponding to a deflection angle of the light beam. .

(2) The writing period T of data corresponding to one dot on the photosensitive means is T with respect to the deflection angle θ of the light beam.
The optical scanning device according to claim 1, which is controlled by a function of =Tocos2θ (where TO is the period when θ=0).