JPH0318509U

JPH0318509U -

Info

Publication number: JPH0318509U
Application number: JP7918489U
Authority: JP
Priority date: 1989-07-05
Filing date: 1989-07-05
Publication date: 1991-02-22

Description

[Brief explanation of drawings]

第１図ないし第５図は本考案による画像形成装
置の一実施例を示す図であり、第１図はレーザビ
ームプリンタの偏向走査部の斜視図、第２図は半
導体レーザとポリゴンミラーとの間の側面図、第
３図はレーザビームプリンタの作動の手順を示す
フローチヤート、第４図は信号出力タイミングを
説明するタイミングチヤート、第５図は２つのビ
ームデイテクタと２つの感光体ドラム上の走査開
始位置との関係を示す概念図である。第６図ない
し第９図は従来の画像形成装置を示す図であり、
第６図は全体構成図、第７図は要部斜視図、第８
図は２つのビームデイテクタと２つの走査開始位
置との関係を示す概念図、第９図は信号出力タイ
ミングを説明するタイミングチヤートである。７０……基板、７１ａ……第１の半導体レーザ
（光源）、７１ｂ……第２の半導体レーザ（光源
）、７５……ポリゴンミラー、８１……基板、８
２ａ，８２ｂ……ビームデイテクタ（光検知器）
、８６……第１の感光体ドラム、８７……第２の
感光体ドラム、９１……記録紙、Ｂ１……レーザ
ビーム、Ｂ２……レーザビーム。 1 to 5 are diagrams showing an embodiment of an image forming apparatus according to the present invention, in which FIG. 1 is a perspective view of a deflection scanning section of a laser beam printer, and FIG. 2 is a perspective view of a semiconductor laser and a polygon mirror. Figure 3 is a flowchart showing the operating procedure of the laser beam printer, Figure 4 is a timing chart explaining signal output timing, and Figure 5 is a side view of two beam detectors and two photoreceptor drums. FIG. 3 is a conceptual diagram showing the relationship between the scanning start position and the scanning start position. 6 to 9 are diagrams showing conventional image forming apparatuses,
Figure 6 is an overall configuration diagram, Figure 7 is a perspective view of main parts, and Figure 8 is a perspective view of main parts.
The figure is a conceptual diagram showing the relationship between two beam detectors and two scanning start positions, and FIG. 9 is a timing chart explaining signal output timing. 70... Substrate, 71a... First semiconductor laser (light source), 71b... Second semiconductor laser (light source), 75... Polygon mirror, 81... Substrate, 8
2a, 82b...Beam detector (photodetector)
, 86...First photosensitive drum, 87...Second photosensitive drum, 91...Recording paper, B1...Laser beam, B2...Laser beam.

Claims

[Scope of utility model registration request]

a plurality of scanning optical systems that deflect a plurality of light beams emitted from a plurality of light sources based on a plurality of image signals and scan and form images on a plurality of recording media; In an image forming apparatus that is equipped with a plurality of photodetectors that output synchronization signals for determining the starting position of image writing on a recording medium, and forms images of a plurality of colors on a recording paper, the plurality of light sources are An image forming apparatus characterized in that the plurality of photodetectors are also arranged on a single substrate.