JPS6199826U

JPS6199826U -

Info

Publication number: JPS6199826U
Application number: JP18508784U
Authority: JP
Priority date: 1984-12-06
Filing date: 1984-12-06
Publication date: 1986-06-26

Description

[Brief explanation of the drawing]

第１図……本考案の一実施例を示す図、第１図
ａ……前記一実施例のうち光学系、光学系及びフ
オトセンサの配置を示す説明図、第１図ｂ……前
記一実施例のうち、制御回路の構成を示す説明図
、第１図ｃ……第１図ｂ内に示されるタイミング
検出回路の内部構成を示す説明図、第２図……第
１図ａの構成に使用される各フオトセンサの走査
ビーム検出信号のタイミングを示す図表、第２図
ａ……理想的同期状態、第２図ｂ……制御開始当
初の状態、第２図ｃ……制御開始後の状態を夫々
示す図、第３図……従来の単色レーザプリンタの
構成を示す説明図。符号表、１，１ａ，１ｂ……半導体レーザ、２
，２ａ，２ｂ……コリメータレンズ、３，３ａ，
３ｂ……ポリゴンミラー、４，４ａ，４ｂ……ｆ
θレンズ、５ａ，５ｂ……スキヤンスタートセン
サ、６ａ，６ｂ……スタートエンドセンサ、７，
７ｓ，７ｂ……感光体ドラム、８……同期センサ
、９……タイミング検出回路、９ａ，９ｂ……カ
ウンタ、９ｃ……差分演算回路、９ｄ……基準電
圧発生回路、９ｅ……加算器、９ｆ……電圧制御
発振回路、１０……ポリゴンミラー駆動回路、１
１ｂ……ポリゴンミラー３ｂを駆動する電動機。 Fig. 1...A diagram showing one embodiment of the present invention, Fig. 1a...An explanatory diagram showing the arrangement of an optical system, an optical system, and a photo sensor in the above-mentioned embodiment, Fig. 1b...The above-mentioned embodiment Among the examples, an explanatory diagram showing the configuration of the control circuit, FIG. 1c...an explanatory diagram showing the internal configuration of the timing detection circuit shown in FIG. 1b, and FIG. Chart showing the timing of the scanning beam detection signal of each photo sensor used, Fig. 2a...ideal synchronized state, Fig. 2b...state at the beginning of control, Fig. 2c...state after control starts FIG. 3 is an explanatory diagram showing the configuration of a conventional monochrome laser printer. Code table, 1, 1a, 1b... Semiconductor laser, 2
, 2a, 2b... collimator lens, 3, 3a,
3b...polygon mirror, 4, 4a, 4b...f
θ lens, 5a, 5b...Scan start sensor, 6a, 6b...Start end sensor, 7,
7s, 7b...Photosensitive drum, 8...Synchronization sensor, 9...Timing detection circuit, 9a, 9b...Counter, 9c...Difference calculation circuit, 9d...Reference voltage generation circuit, 9e...Adder, 9f... Voltage controlled oscillation circuit, 10... Polygon mirror drive circuit, 1
1b...Electric motor that drives the polygon mirror 3b.

Claims

[Scope of Claim for Utility Model Registration] In a laser planter equipped with a plurality of optical systems that scan a photoreceptor surface by deflecting a laser beam modulated according to an image signal via a polygon mirror, scanning each photoreceptor surface is started. A plurality of sensors are provided at predetermined positions of the point, and the detection signals of the plurality of sensors are input and the timing difference is calculated, and one of the polygon mirrors is
1. A polygon mirror rotation synchronizing device for a laser printer, comprising: one driving state and a control means for synchronizing the remaining polygon mirrors to the one driving state based on the timing difference.