JPH049014U - - Google Patents
Info
- Publication number
- JPH049014U JPH049014U JP9975890U JP9975890U JPH049014U JP H049014 U JPH049014 U JP H049014U JP 9975890 U JP9975890 U JP 9975890U JP 9975890 U JP9975890 U JP 9975890U JP H049014 U JPH049014 U JP H049014U
- Authority
- JP
- Japan
- Prior art keywords
- lens
- theta
- laser beam
- beam scanning
- scanning direction
- 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
Links
- 230000003287 optical effect Effects 0.000 claims description 6
- 108091008695 photoreceptors Proteins 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
Landscapes
- Mounting And Adjusting Of Optical Elements (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Facsimiles In General (AREA)
Description
第１図は第１実施例に係るｆθレンズユニツト
の平面図、第２図は同正面図、第３図は第１図イ
−イ線断面図、第４図はレンズ調整の説明図、第
５図はデジタル複写機の構成図、第６図は書込光
学系のレイアウト図、第７図は書込光学ユニツト
と感光体の配置関係を示す図、第８図は第２実施
例の平面図、第９図は第２実施例のレンズ調整の
説明図、第１０図は回転中心の変化の説明図、第
１１図は第２実施例の要部の他の例の示す図であ
る。
８……書込光学ユニツト、９，１０，１１……
ｆθレンズ、１５，１７……レンズ調整用の板バ
ネ、１８，１９……調整ネジ、３１……曲面部、
３３……多角形部。
FIG. 1 is a plan view of the fθ lens unit according to the first embodiment, FIG. 2 is a front view thereof, FIG. 3 is a sectional view taken along the line A--A in FIG. 1, and FIG. 4 is an explanatory diagram of lens adjustment. Figure 5 is a configuration diagram of the digital copying machine, Figure 6 is a layout diagram of the writing optical system, Figure 7 is a diagram showing the arrangement relationship between the writing optical unit and the photoreceptor, and Figure 8 is a plan view of the second embodiment. 9 are explanatory diagrams of lens adjustment in the second embodiment, FIG. 10 is an explanatory diagram of changes in the center of rotation, and FIG. 11 is a diagram showing another example of the main part of the second embodiment. 8...Writing optical unit, 9, 10, 11...
fθ lens, 15, 17... plate spring for lens adjustment, 18, 19... adjustment screw, 31... curved surface part,
33...Polygonal part.
Claims (1)
を反射鏡によつて偏光させ、感光体上に画像を形
成する画像形成装置の光学ユニツトに備えられる
ｆθレンズユニツトにおいて、アナモフイツクな
面を有するｆθレンズと、このｆθレンズを調整
可能に保持する保持手段とを有することを特徴と
するｆθレンズユニツト。 (2) 請求項１記載において、前記ｆθレンズの
レーザビーム走査方向の外形面と当接する前記保
持手段の当接面に、レーザビーム走査方向に垂直
で、かつ光軸方向に垂直な方向に曲率を有する曲
面部を形成したことを特徴とするｆθレンズユニ
ツト。 (3) 請求項１記載において、前記ｆθレンズの
レーザービーム走査方向の外形面と当接する前記
保持手段の当接面に、レーザビーム走査方向に垂
直で、かつ光軸方向に垂直な方向に沿つて多角形
の突起を形成したことを特徴とするｆθレンズユ
ニツト。[Claims for Utility Model Registration] (1) An f-theta lens unit included in an optical unit of an image forming apparatus that polarizes a laser beam modulated by an image signal using a reflecting mirror and forms an image on a photoreceptor. An f.theta. lens unit characterized by comprising an f.theta. lens having an anamorphic surface and a holding means for holding the f.theta. lens in an adjustable manner. (2) In claim 1, a contact surface of the holding means that contacts an external surface of the fθ lens in the laser beam scanning direction has a curvature in a direction perpendicular to the laser beam scanning direction and perpendicular to the optical axis direction. An fθ lens unit characterized by forming a curved surface portion having a curved surface portion. (3) In claim 1, a contact surface of the holding means that comes into contact with an external surface of the fθ lens in the laser beam scanning direction is provided along a direction perpendicular to the laser beam scanning direction and perpendicular to the optical axis direction. An f-theta lens unit characterized by forming a polygonal protrusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9975890U JPH049014U (en) | 1990-03-26 | 1990-09-26 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2956790 | 1990-03-26 | ||
| JP9975890U JPH049014U (en) | 1990-03-26 | 1990-09-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH049014U true JPH049014U (en) | 1992-01-27 |
Family
ID=31889954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9975890U Pending JPH049014U (en) | 1990-03-26 | 1990-09-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH049014U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03168715A (en) * | 1989-11-29 | 1991-07-22 | Ricoh Kogaku Kk | Image forming lens holding device of optical scanning device |
-
1990
- 1990-09-26 JP JP9975890U patent/JPH049014U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03168715A (en) * | 1989-11-29 | 1991-07-22 | Ricoh Kogaku Kk | Image forming lens holding device of optical scanning device |
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