JPH0618802A - Optical scanning device - Google Patents

Optical scanning device

Info

Publication number
JPH0618802A
JPH0618802A JP19595592A JP19595592A JPH0618802A JP H0618802 A JPH0618802 A JP H0618802A JP 19595592 A JP19595592 A JP 19595592A JP 19595592 A JP19595592 A JP 19595592A JP H0618802 A JPH0618802 A JP H0618802A
Authority
JP
Japan
Prior art keywords
optical
light
scanning
scanned
opening
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
JP19595592A
Other languages
Japanese (ja)
Inventor
Takehiko Nakai
中井  武彦
Original Assignee
Canon Inc
キヤノン株式会社
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 Canon Inc, キヤノン株式会社 filed Critical Canon Inc
Priority to JP19595592A priority Critical patent/JPH0618802A/en
Publication of JPH0618802A publication Critical patent/JPH0618802A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To focus the respective light beams well on a surface to be scanned and to obtain an optical scanning device capable of optical scanning with high accuracy when the plural light beams are simultaneously scanned on the surface to be scanned. CONSTITUTION:In the optical scanning device for forming the images of plural light beams emitted from a light source means 1 having plural light emitting parts 2a, 2b which are independently made to modulate optically by means of an anamorphic optical system with a refractive power in the subscanning direction through an opening part 4 on the deflection surface of an opticcal deflector 6, forming the image of the deflected light beam deflected by the optical deflector 6 on a surface to be scanned by means of an image forming optical system 7 and optically scanning simultaneously with plural light beams in the main scanning direction, the opening part 4 and the image forming optical system 7 are made to be almost conjugated relation to the anamorphic optical system and the principal light ray of the beams emitted from the plural light emitting parts 2a, 2b crosses the optical axis of the image forming optical system 7 in the vicinity of the opening part 4.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は光走査装置に関し、特に
複数個の発光部を有する光源手段を用い、該光源手段か
ら放射された複数の光束を光偏向器を介して被走査面上
に導光し、複数の光束で同時に光走査して、例えば画像
情報の形成を行なうようにしたレーザービームプリンタ
(LBP)等に好適な光走査装置に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical scanning device, and more particularly to a light source means having a plurality of light emitting portions, and a plurality of light fluxes emitted from the light source means on a surface to be scanned through an optical deflector. The present invention relates to an optical scanning device suitable for a laser beam printer (LBP) or the like that guides light and simultaneously scans a plurality of light beams to form image information.

【0002】[0002]

【従来の技術】従来より独立に光変調可能な複数の光束
を用いて被走査面である感光媒体面上を一括走査するよ
うにした光走査装置が種々と提案されている。
2. Description of the Related Art Conventionally, various optical scanning devices have been proposed which collectively scan the surface of a photosensitive medium, which is a surface to be scanned, by using a plurality of light beams which can be independently modulated.

【0003】図4,図5は従来のこの種の光走査装置の
要部概略図と副走査断面内の光路を示した概略図であ
る。図中、11は光源手段であり複数の発光部12a,
12bを有している。発光部12a,12bは半導体レ
ーザ等よりなり、副走査方向に並べて配置している。1
3はコリメータレンズであり、光源手段11から放射さ
れる光束を平行光束としている。
FIGS. 4 and 5 are a schematic view of a main part of a conventional optical scanning device of this type and a schematic view showing an optical path in a sub-scanning section. In the figure, 11 is a light source means, and a plurality of light emitting parts 12a,
It has 12b. The light emitting portions 12a and 12b are made of a semiconductor laser or the like and are arranged side by side in the sub-scanning direction. 1
Reference numeral 3 denotes a collimator lens, which makes the light beam emitted from the light source means 11 a parallel light beam.

【0004】14は開口部(絞り)であり、光束の径を
制限している。15はシリンドリカルレンズ(アナモフ
ィック光学系)である。シリンドリカルレンズ15は副
走査方向にのみ屈折力を有しており、光源手段11から
の光束をコリメータレンズ13と開口部14を介した
後、偏向器16の偏向面上に線状に結像させている。
Reference numeral 14 denotes an opening (diaphragm) which limits the diameter of the light beam. Reference numeral 15 is a cylindrical lens (anamorphic optical system). The cylindrical lens 15 has a refracting power only in the sub-scanning direction, and forms a light beam from the light source means 11 into a linear image on the deflection surface of the deflector 16 after passing through the collimator lens 13 and the opening 14. ing.

【0005】偏向器16は回転多面鏡等よりなり矢印a
方向(図4)に一定速度で回転している。
The deflector 16 is composed of a rotating polygon mirror or the like and is indicated by an arrow a.
It is rotating at a constant speed in the direction (Fig. 4).

【0006】17は結像光学系、18は回転ドラム(感
光体)である。偏向器16で偏向された光束を結像光学
系17により感光ドラム18の表面(被走査面)18a
上に結像している。
Reference numeral 17 is an image forming optical system, and 18 is a rotating drum (photosensitive member). The light beam deflected by the deflector 16 is directed to the surface (scanned surface) 18a of the photosensitive drum 18 by the imaging optical system 17.
Imaged above.

【0007】そして光偏向器16の回転に伴って被走査
面18a上の主走査方向を2つのスポットで等速に光走
査している。それと共に回転ドラム18を矢印b方向に
回転させることにより副走査方向の光走査をしている。
As the optical deflector 16 rotates, the main scanning direction on the surface to be scanned 18a is optically scanned with two spots at a constant speed. At the same time, the rotary drum 18 is rotated in the direction of arrow b to perform optical scanning in the sub-scanning direction.

【0008】この他、複数の光束を用いて被走査面上を
同時に光走査するようにした光走査装置として図6に示
すものがある。図6の装置は図4の装置に比べて各光束
ごとに結像光学系17a,17bを設けている。
In addition to the above, there is an optical scanning device shown in FIG. 6 as an optical scanning device which simultaneously optically scans a surface to be scanned by using a plurality of light beams. The apparatus shown in FIG. 6 is provided with image forming optical systems 17a and 17b for each light beam as compared with the apparatus shown in FIG.

【0009】[0009]

【発明が解決しようとしている課題】発光部を複数用い
た場合、これらの発光部を被走査面18a上でのスポッ
トの間隔から求められる所定距離だけ離して配置する必
要がある。例えば図4,図5に示した装置例では発光部
12aを結像光学系17の光軸上に配置し、即ち発光部
12aからの光束の主光線La(光線)が結像光学系の
光軸上を通るように配置している。
When a plurality of light emitting parts are used, it is necessary to dispose these light emitting parts at a predetermined distance which is obtained from the distance between the spots on the scanned surface 18a. For example, in the device example shown in FIGS. 4 and 5, the light emitting section 12a is arranged on the optical axis of the imaging optical system 17, that is, the principal ray La (light ray) of the light flux from the light emitting section 12a is the light of the imaging optical system. It is arranged so that it passes along the axis.

【0010】そして発光部12bを副走査方向に所定の
間隔を隔てて配置し、発光部12bからの光束の主光線
Lbが絞り14と光軸上の位置で交わるように配置して
いる。
The light emitting portions 12b are arranged at a predetermined interval in the sub-scanning direction so that the principal ray Lb of the light beam from the light emitting portion 12b intersects with the diaphragm 14 at a position on the optical axis.

【0011】このとき発光部12bからの光束Lbは結
像光学系17の光軸からはずれた領域を通過するように
なる。この為、結像光学系の諸収差の影響で光束Lbの
被走査面18a上での結像性能が悪くなり良好なるスポ
ット形状が得られないといった問題点があった。
At this time, the light beam Lb from the light emitting section 12b passes through a region of the imaging optical system 17 which is off the optical axis. Therefore, there is a problem that due to the various aberrations of the imaging optical system, the imaging performance of the light beam Lb on the surface to be scanned 18a is deteriorated and a good spot shape cannot be obtained.

【0012】又、図6に示す装置は被走査面18a上に
おける各光束Lc,Ldのスポット形状は比較的良好に
なるが装置全体が大型化及び複雑化しやすいといった問
題点があった。
Further, the apparatus shown in FIG. 6 has a problem that the spot shape of each of the light beams Lc and Ld on the surface to be scanned 18a is relatively good, but the apparatus as a whole tends to be large and complicated.

【0013】本発明では副走査断面内において、開口部
と結像光学系とをアナモフィック光学系に対して略共役
関係となるようにし該開口部の光軸近傍にて複数の発光
部からの光束の各主光線が交わるように設定することに
より被走査面上を複数の光束で同時に走査する際、各光
束が各々被走査面上で良好にピントを結び、高い精度で
光走査可能な光走査装置の提供を目的とする。
In the present invention, in the sub-scanning cross section, the aperture and the imaging optical system are made to have a substantially conjugate relationship with the anamorphic optical system, and the light fluxes from a plurality of light emitting portions are provided near the optical axis of the aperture. By scanning so that the main rays of the beam intersect each other, when multiple light beams are simultaneously scanned on the surface to be scanned, each light beam is well focused on the surface to be scanned, and optical scanning is possible with high accuracy. The purpose is to provide a device.

【0014】[0014]

【課題を解決する為の手段】本発明の光走査装置は、独
立に光変調可能な発光部を副走査方向に複数有した光源
手段から放射された複数の光束を開口部を介して、副走
査方向に屈折力を有したアナモフィック光学系により、
光偏向器の偏向面上に結像させ、該光偏向器で偏向され
た光束を結像光学系により被走査面上に結像し、該複数
の光束で同時に主走査方向に光走査する光走査装置にお
いて、該開口部と該結像光学系とを該アナモフィック光
学系に対してほぼ共役関係となるようにし、該複数の発
光部から放射された光束の主光線が、該開口部近傍で該
結像光学系の光軸と交差するように構成したことを特徴
としている。
In the optical scanning device of the present invention, a plurality of light beams emitted from a light source means having a plurality of light emitting portions capable of independently light modulation in the sub scanning direction are sub-scanned through an opening. By the anamorphic optical system having a refractive power in the scanning direction,
Light that forms an image on the deflection surface of the optical deflector, forms an image of the light beam deflected by the optical deflector on the surface to be scanned by the imaging optical system, and simultaneously performs optical scanning in the main scanning direction with the plurality of light beams. In the scanning device, the aperture and the imaging optical system are made to have a substantially conjugate relationship with the anamorphic optical system, and the chief ray of the light flux emitted from the plurality of light emitting units is near the aperture. It is characterized in that it is configured to intersect the optical axis of the imaging optical system.

【0015】特に、前記開口部と前記結像光学系との前
記アナモフィック光学系に対する共役関係が該開口部側
で等倍又は縮小側と成るようにしたことや、前記結像光
学系はトーリック面を有し、該トーリック面と前記開口
部とを前記アナモフィック光学系に対して共役関係とな
るようにしたことや、前記開口部と前記トーリック面と
の前記アナモフィック光学系に対する共役関係が該開口
部側で等倍又は縮小側と成るようにしたことを特徴とす
ること等を特徴としている。
In particular, the conjugate relationship between the opening and the imaging optical system with respect to the anamorphic optical system is set to be the same magnification or reduction on the opening side, and the imaging optical system has a toric surface. Having a conjugate relationship between the toric surface and the opening with respect to the anamorphic optical system, and the conjugate relationship between the opening and the toric surface with respect to the anamorphic optical system is the opening. It is characterized in that the side is the same size or the reduction side.

【0016】[0016]

【実施例】図1は本発明の実施例1の要部概略図、図2
は図1の光学系を展開したときの副走査断面内の主光線
の光路図、図3(A),(B)は図1の光学系を展開し
たときの主走査断面内と副走査断面内の光路図である。
図中、1は光源手段であり複数(同図では2つ)の発光
部2a,2bを有している。発光部2a,2bは半導体
レーザ等よりなり、副走査方向に並べて配置している。
3はコリメータレンズであり、光源手段1の各発光部2
a,2bから放射される光束を平行光束としている。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic view of the essential portions of a first embodiment of the present invention, and FIG.
1 is an optical path diagram of a principal ray in the sub-scanning section when the optical system of FIG. 1 is developed, and FIGS. 3A and 3B are main scanning section and sub-scanning section when the optical system of FIG. 1 is developed. FIG.
In the figure, reference numeral 1 denotes a light source means having a plurality (two in the figure) of light emitting portions 2a and 2b. The light emitting portions 2a and 2b are made of a semiconductor laser or the like and are arranged side by side in the sub-scanning direction.
Reference numeral 3 denotes a collimator lens, and each light emitting unit 2 of the light source means 1
The light fluxes emitted from a and 2b are parallel light fluxes.

【0017】コリメータレンズ3の焦点距離をf1とし
たとき光源手段1とコリメータレンズ3との間隔がf1
となるようにしている。
When the focal length of the collimator lens 3 is f1, the distance between the light source means 1 and the collimator lens 3 is f1.
I am trying to become.

【0018】4は開口部(絞り)であり通過光束の径を
制限している。5はシリンドリカルレンズ(アナモフィ
ック光学系)である。シリンドリカルレンズ5は副走査
方向にのみ屈折力を有しており、光源手段1からの光束
をコリメータレンズ3と開口部4を介した後、偏向器6
の偏向面6a面上に線状に結像させている。
Reference numeral 4 denotes an opening (diaphragm) which limits the diameter of the passing light beam. Reference numeral 5 denotes a cylindrical lens (anamorphic optical system). The cylindrical lens 5 has a refracting power only in the sub-scanning direction, passes the light flux from the light source means 1 through the collimator lens 3 and the opening 4, and then deflects the deflector 6.
A linear image is formed on the deflecting surface 6a.

【0019】偏向器6は回転多面鏡等よりなり矢印a方
向(図1)に一定速度で回転している。
The deflector 6 is composed of a rotary polygon mirror or the like and rotates at a constant speed in the direction of arrow a (FIG. 1).

【0020】7は結像光学系、8は回転ドラム(感光
体)である。偏向器6で偏向された光束を該結像光学系
7により感光ドラム18の表面(被走査面)18a上に
結像している。
Reference numeral 7 is an image forming optical system, and 8 is a rotating drum (photosensitive member). The light beam deflected by the deflector 6 is imaged on the surface (scanned surface) 18a of the photosensitive drum 18 by the imaging optical system 7.

【0021】そして光偏向器6の回転に伴って被走査面
8a上の主走査方向を2つのスポットで等速に光走査し
ている。それと共に回転ドラム8を矢印b方向に回転さ
せることにより副走査方向の光走査をしている。
As the optical deflector 6 rotates, the main scanning direction on the surface 8a to be scanned is optically scanned with two spots at a constant speed. At the same time, the rotary drum 8 is rotated in the direction of arrow b to perform optical scanning in the sub-scanning direction.

【0022】本実施例において、光源手段1は複数の発
光部2a,2bを副走査方向に特定の間隔で配置してい
る。このうち発光部2aは、それからの光束の主光線
(絞り4の中心を通過する中心光)Laが結像光学系7
の光軸L上を通るように配置している。
In this embodiment, the light source means 1 has a plurality of light emitting portions 2a and 2b arranged at a specific interval in the sub-scanning direction. Of these, in the light emitting section 2a, the principal ray (center light passing through the center of the diaphragm 4) La of the light flux from the light emitting section 2a is formed into the imaging optical system 7
It is arranged so as to pass on the optical axis L of.

【0023】そして発光部2bは副走査方向に所定の間
隔を隔てて配置し、発光部2bからの光束の主光線Lb
が絞り4と略光軸上の位置で交わるように配置してい
る。そして副走査断面内において絞り4と結像光学系7
とがシリンドリカルレンズ5に対して共役関係となるよ
うに各要素を設定している。
The light emitting portion 2b is arranged at a predetermined interval in the sub-scanning direction, and the principal ray Lb of the luminous flux from the light emitting portion 2b is arranged.
Are arranged so as to intersect the diaphragm 4 at a position substantially on the optical axis. Then, in the sub-scan section, the diaphragm 4 and the imaging optical system 7
The respective elements are set so that and have a conjugate relationship with the cylindrical lens 5.

【0024】即ちシリンドリカルレンズ5の副走査断面
内の焦点距離をf2、副走査断面内において、絞り4を
シリンドリカルレンズ5により結像光学系7に結像させ
る際の倍率をβとしたとき絞り4とシリンドリカルレン
ズ5との間隔を(1−1/β)×f2とし、シリンドリ
カルレンズ5と結像光学系7との間隔を(1−β)×f
2としている。
That is, when the focal length in the sub-scan section of the cylindrical lens 5 is f2 and the magnification when the diaphragm 4 is imaged on the imaging optical system 7 by the cylindrical lens 5 in the sub-scan section is β, the stop 4 And the cylindrical lens 5 is (1-1 / β) × f2, and the interval between the cylindrical lens 5 and the imaging optical system 7 is (1-β) × f.
2

【0025】これにより発光部2bから射出した光束の
主光線Lbは図2に示したように絞り4をその光軸上を
通過後、シリンドリカルレンズ5により光偏向器6の偏
向面6a上に結像され、該偏向面6aで偏向されて結像
光学系17に入射する。このとき主光線Lbは結像光学
系17にその光軸Lと交差するように入射する。
As a result, the principal ray Lb of the light beam emitted from the light emitting section 2b passes through the diaphragm 4 on its optical axis as shown in FIG. 2 and is then coupled by the cylindrical lens 5 onto the deflection surface 6a of the optical deflector 6. An image is formed, is deflected by the deflecting surface 6a, and enters the image forming optical system 17. At this time, the chief ray Lb enters the imaging optical system 17 so as to intersect the optical axis L thereof.

【0026】このように本実施例では軸外に配置した発
光部2bからの光束の主光線が結像光学系17に入射す
るとき、前述の如く共役関係を設定することにより、光
軸Lから離れないようにしている。
As described above, in this embodiment, when the principal ray of the light beam from the light emitting portion 2b arranged off-axis is incident on the imaging optical system 17, the conjugate relation is set as described above so that the optical axis L I try not to leave.

【0027】これにより結像光学系17から発生する諸
収差の影響が少なくなるようにして複数の光束を用いて
被走査面8a上を同時に光走査する際の被走査面8aに
入射する各光束のスポット形状を良好に維持している。
As a result, the influences of various aberrations generated from the image forming optical system 17 are reduced, and each light beam incident on the surface 8a to be scanned when the surface 8a to be scanned is simultaneously optically scanned using a plurality of light beams. Maintains a good spot shape.

【0028】尚、本実施例の結像光学系7がトーリック
面を有するときは該トーリック面と開口部4とがシリン
ドリカルレンズ5に対して共役関係と成るように構成す
るのが光学性能上好ましい。
When the image forming optical system 7 of this embodiment has a toric surface, it is preferable in terms of optical performance that the toric surface and the opening 4 have a conjugate relationship with the cylindrical lens 5. .

【0029】この他、本実施例では絞り4と結像光学系
7との共役関係を絞り4側が等倍または縮小側となるよ
うに配置するのが結像光学系7へ入射する光束の入射角
が緩くなり、更に良好な光走査を行うことができるので
好ましい。
In addition, in the present embodiment, it is necessary to arrange the conjugate relation between the diaphragm 4 and the imaging optical system 7 so that the diaphragm 4 side is at the same magnification or the reduction side, and the light flux incident on the imaging optical system 7 is incident on it. This is preferable because the angle becomes gentle and more excellent optical scanning can be performed.

【0030】また、絞り4及び結像光学系7を不図示の
光走査装置本体上に取り付け、互いの共役関係を常に維
持するようにすれば、半導体レーザ2a,2bやコリメ
ータレンズ3等からなるレーザユニットを交換する際の
光軸方向の調整は不要となるので好ましい。
Further, if the diaphragm 4 and the imaging optical system 7 are mounted on the main body of the optical scanning device (not shown) so as to always maintain the conjugate relationship with each other, the semiconductor lasers 2a and 2b, the collimator lens 3 and the like are formed. Adjustment of the optical axis direction when replacing the laser unit is not necessary, which is preferable.

【0031】[0031]

【発明の効果】本発明によれば以上のように各要素を設
定することにより被走査面上を複数の光束で同時に走査
する際、各光束が各々被走査面上で良好にピントを結
び、高い精度で光走査可能な光走査装置を達成してい
る。
According to the present invention, by setting each element as described above, when simultaneously scanning a surface to be scanned with a plurality of light beams, each light beam is well focused on the surface to be scanned, An optical scanning device capable of performing optical scanning with high accuracy is achieved.

【図面の簡単な説明】[Brief description of drawings]

【図1】 本発明の実施例1の要部概略図FIG. 1 is a schematic view of a main part of a first embodiment of the present invention.

【図2】 図1の副走査断面内の光路を展開したときの
主光線の光路を示した概略図
FIG. 2 is a schematic diagram showing an optical path of a chief ray when the optical path in the sub-scanning section of FIG. 1 is expanded.

【図3】 図1の光路を展開して示した説明図FIG. 3 is an explanatory diagram showing an expanded optical path of FIG.

【図4】 従来の光走査装置の要部概略図FIG. 4 is a schematic view of a main part of a conventional optical scanning device.

【図5】 図4の副走査断面内の光路を展開して示した
概略図
FIG. 5 is a schematic view showing an expanded optical path in the sub-scan section of FIG.

【図6】 従来の光走査装置の副走査断面の光路を展開
して示した概略図
FIG. 6 is a schematic diagram showing an expanded optical path of a sub-scanning section of a conventional optical scanning device.

【符号の説明】[Explanation of symbols]

1 光源手段 2a,2b 発光部 3 コリメータレンズ 4 開口部(絞り) 5 シリンドリカルレンズ 6 光偏向器 7 結像光学系 8 回転ドラム 8a 被走査面 1 Light Source Means 2a, 2b Light Emitting Section 3 Collimator Lens 4 Aperture (Aperture) 5 Cylindrical Lens 6 Optical Deflector 7 Imaging Optical System 8 Rotating Drum 8a Scanned Surface

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 独立に光変調可能な発光部を副走査方向
に複数有した光源手段から放射された複数の光束を開口
部を介して、副走査方向に屈折力を有したアナモフィッ
ク光学系により、光偏向器の偏向面上に結像させ、該光
偏向器で偏向された光束を結像光学系により被走査面上
に結像し、該複数の光束で同時に主走査方向に光走査す
る光走査装置において、該開口部と該結像光学系とを該
アナモフィック光学系に対して略共役関係となるように
し、該複数の発光部から放射された光束の主光線が、該
開口部近傍で該結像光学系の光軸と交差するように構成
したことを特徴とする光走査装置。
1. An anamorphic optical system having a refracting power in the sub-scanning direction through a plurality of light beams emitted from a light source means having a plurality of light-emitting units capable of independently light-modulating in the sub-scanning direction through an opening. , An image is formed on the deflection surface of the optical deflector, the light beam deflected by the optical deflector is imaged on the surface to be scanned by the imaging optical system, and the plural light beams are simultaneously scanned in the main scanning direction. In the optical scanning device, the aperture and the imaging optical system are made to have a substantially conjugate relationship with the anamorphic optical system, and the chief ray of the light flux emitted from the plurality of light emitting units is near the aperture. The optical scanning device is characterized by intersecting the optical axis of the imaging optical system.
【請求項2】 前記開口部と前記結像光学系との前記ア
ナモフィック光学系に対する共役関係が該開口部側で等
倍又は縮小側と成るようにしたことを特徴とする請求項
1の光走査装置。
2. The optical scanning according to claim 1, wherein the conjugate relationship between the opening and the imaging optical system with respect to the anamorphic optical system is a magnification or reduction on the opening side. apparatus.
【請求項3】 前記結像光学系はトーリック面を有し、
該トーリック面と前記開口部とを前記アナモフィック光
学系に対して共役関係となるようにしたことを特徴とす
る請求項1の光走査装置。
3. The imaging optical system has a toric surface,
2. The optical scanning device according to claim 1, wherein the toric surface and the opening have a conjugate relationship with the anamorphic optical system.
【請求項4】 前記開口部と前記トーリック面との前記
アナモフィック光学系に対する共役関係が該開口部側で
等倍又は縮小側と成るようにしたことを特徴とする請求
項3の光走査装置。
4. The optical scanning device according to claim 3, wherein the conjugate relationship between the opening and the toric surface with respect to the anamorphic optical system is a magnification or reduction on the opening side.
JP19595592A 1992-06-29 1992-06-29 Optical scanning device Pending JPH0618802A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19595592A JPH0618802A (en) 1992-06-29 1992-06-29 Optical scanning device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19595592A JPH0618802A (en) 1992-06-29 1992-06-29 Optical scanning device

Publications (1)

Publication Number Publication Date
JPH0618802A true JPH0618802A (en) 1994-01-28

Family

ID=16349758

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19595592A Pending JPH0618802A (en) 1992-06-29 1992-06-29 Optical scanning device

Country Status (1)

Country Link
JP (1) JPH0618802A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5805199A (en) * 1996-04-03 1998-09-08 Ricoh Company, Ltd. Multi-beam write optical system
US6833939B1 (en) 2000-02-04 2004-12-21 Fuji Xerox Co., Ltd. Light scanning method and light scanning device
JP2009003393A (en) * 2007-06-25 2009-01-08 Ricoh Printing Systems Ltd Optical scanner and image forming device provided with same
US20110052263A1 (en) * 2009-09-02 2011-03-03 Ricoh Company, Ltd. Optical scanner and image forming apparatus
JP2011227520A (en) * 2011-07-19 2011-11-10 Toshiba Corp Optical device
US8803937B2 (en) 2011-11-22 2014-08-12 Canon Kabushiki Kaisha Optical scanning apparatus and image forming apparatus

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5805199A (en) * 1996-04-03 1998-09-08 Ricoh Company, Ltd. Multi-beam write optical system
US6833939B1 (en) 2000-02-04 2004-12-21 Fuji Xerox Co., Ltd. Light scanning method and light scanning device
JP2009003393A (en) * 2007-06-25 2009-01-08 Ricoh Printing Systems Ltd Optical scanner and image forming device provided with same
US20110052263A1 (en) * 2009-09-02 2011-03-03 Ricoh Company, Ltd. Optical scanner and image forming apparatus
JP2011053436A (en) * 2009-09-02 2011-03-17 Ricoh Co Ltd Optical scanner and image forming apparatus
US8564635B2 (en) 2009-09-02 2013-10-22 Ricoh Company, Ltd. Optical scanner and image forming apparatus
JP2011227520A (en) * 2011-07-19 2011-11-10 Toshiba Corp Optical device
US8803937B2 (en) 2011-11-22 2014-08-12 Canon Kabushiki Kaisha Optical scanning apparatus and image forming apparatus

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