JPS62187318A - Light beam scanning device - Google Patents
Light beam scanning deviceInfo
- Publication number
- JPS62187318A JPS62187318A JP61029299A JP2929986A JPS62187318A JP S62187318 A JPS62187318 A JP S62187318A JP 61029299 A JP61029299 A JP 61029299A JP 2929986 A JP2929986 A JP 2929986A JP S62187318 A JPS62187318 A JP S62187318A
- Authority
- JP
- Japan
- Prior art keywords
- deflector
- light beam
- beams
- light
- lens
- 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 abstract description 38
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 108091008695 photoreceptors Proteins 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Printer (AREA)
- Mechanical Optical Scanning Systems (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
【発明の詳細な説明】
(技術分野)
本発明は光ビーム走査装置にかかり、特に複数のビーム
を入射させて走査する光ビーム走査装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a light beam scanning device, and more particularly to a light beam scanning device that scans by inputting a plurality of beams.
(従来の技術)
電子写真と光ビーム走査光学系を用いたデジタルカラー
プリンタは、原稿を色分解し、各色の情報を別々の感光
体に記録、現像し、同一転写紙にかさねて転写して定着
さけるようになされる。(Prior art) A digital color printer using electrophotography and a light beam scanning optical system separates the original into colors, records each color's information on separate photoreceptors, develops it, and transfers it onto the same transfer paper. This is done to prevent it from becoming established.
上記のようなデジタルカラープリンタでは、各色の走査
粘度およびコストなどの点から多ビームを一つの偏向器
により走査する方式が有効である。In the digital color printer as described above, it is effective to scan multiple beams using one deflector in terms of scanning viscosity of each color and cost.
ところで一般にレーザービームプリンタに用いられる光
ビーム走査光学系は、以に知られるように基本的には光
源、光ビーム整形光学系、光ビーム偏向器、fθ補正光
学系、面倒れ補正光学系からなっている。By the way, the light beam scanning optical system generally used in laser beam printers basically consists of a light source, a light beam shaping optical system, a light beam deflector, an fθ correction optical system, and a surface tilt correction optical system. ing.
光学系は全体としてt+IJ1株光学系からなっており
、補正機能は光学系以外C受持つ場合がある。このよう
な構成は、複数の光ビームを走査し、それぞれ別々の感
光体に光占込みを行なう方式のデジタルカラープリンタ
の光ビーム走査光学系においても同様である。The optical system as a whole consists of a t+IJ1 stock optical system, and the correction function may be in charge of C other than the optical system. Such a configuration is similar to the light beam scanning optical system of a digital color printer that scans a plurality of light beams and focuses the light onto separate photoreceptors.
第6図にその光学系の概要を示しているように、図示し
ない光源は、気体レー11、半導体レーザ等であり、各
光ビームB、B・・・の数だけ有するか、あるいは気体
レーザの場合にはRN変調素子によって1ビームを多ビ
ームに分けてもよいし、また半導体レーザの場合にはア
レイ状素子になっていてもよい。As the outline of the optical system is shown in FIG. 6, the light sources (not shown) are gas lasers 11, semiconductor lasers, etc., and the light sources have the same number of light beams B, B... In some cases, one beam may be divided into multiple beams by an RN modulation element, or in the case of a semiconductor laser, an array-like element may be used.
いずれにしても、公知の光ビーム整形手段、変調手段、
例えば半導体レーザ光を平行光にづるコリメートレンズ
、横長の形状を得るアパーチャ、レーIア駆動電流を画
信丹によって変える変調回路を有し、而倒れ補正光学系
の一部を構成する補正レンズ(シリンドリカルレンズ)
がおかれている。In any case, known light beam shaping means, modulation means,
For example, it has a collimating lens that converts semiconductor laser light into parallel light, an aperture that obtains a horizontally elongated shape, and a modulation circuit that changes the laser drive current by image tanning, and a correction lens that forms part of the tilt correction optical system ( cylindrical lens)
is placed.
光ビーム偏向器1としては、図示のようにポリゴンミラ
ー、ホログラムディスクをス1,17ナモータ2で高速
回転させるものや、ガルバノミラ−が知られており、こ
の光ビーム偏向器1により光ビームB、B・・・は平面
内を一定速度で走査される。As the light beam deflector 1, as shown in the figure, a polygon mirror, a hologram disk rotated at high speed by a scanner motor 2, and a galvanometer mirror are known. B... is scanned within a plane at a constant speed.
符号3は、感光体4A、4Bの結像面において光ビーム
Bが等遠心線走査するためのfθ15性を1’T ij
”るfθレンズであり、この「θレンズ3を出た光ビー
ムBはミラー5A、5Bで光路が変更され、而倒れ補正
光学系の一部である補正レンズ(シリンドリカルレンズ
>6A、、6Bを通って感光体4Δ、4Bの感光面に結
像される。Reference numeral 3 denotes the fθ15 characteristic for the isocentrifugal scanning of the light beam B on the imaging planes of the photoreceptors 4A and 4B by 1'T ij
The optical path of the light beam B exiting the θ lens 3 is changed by mirrors 5A and 5B, and the optical path is changed by the correction lens (cylindrical lens > 6A, 6B) which is part of the tilt correction optical system. The light passes through and is imaged on the photosensitive surfaces of photoreceptors 4Δ and 4B.
この場合、複数の光ビームが同−偏向器と同−fθレン
ズとを通る必要はないが、各色の色ずれが重大な問題と
なるデジタルカラープリンタにおいては同一の走査精度
を確保するために上記の同一偏向器と同−fθレンズと
を通すことがあり、コストの面からも有利になる。In this case, it is not necessary for multiple light beams to pass through the same deflector and the same fθ lens, but in order to ensure the same scanning accuracy in digital color printers where color misalignment of each color is a serious problem, The same deflector and the same -fθ lens may be passed through, which is also advantageous from a cost standpoint.
一方、入射する光ビームB、B・・・は必ずしも平行で
なくともよいが、近接している必要がある。On the other hand, the incident light beams B, B, . . . do not necessarily have to be parallel, but need to be close to each other.
すなわち、fθレンズ3の光軸に対する光ビームB、B
・・・のずれは画質に影響し、許容限界内のピッチしか
とれない。またポリゴンミラーはその性質としてミラー
の厚みとコストとが比例するので、ビームピッチを広く
とるとコスト高となる。That is, the light beams B, B with respect to the optical axis of the fθ lens 3
The deviation in ... affects the image quality, and the pitch can only be within the permissible limit. Further, as a characteristic of polygon mirrors, the thickness of the mirror is proportional to the cost, so if the beam pitch is widened, the cost will be high.
上記のような光ビーム走査光学系では、偏向後にその光
ビーム間ピッチを拡大することができないため、ビーム
聞ピッチを偏向後にミラーぐ分離可能となるだけ広くと
っており、その結実装置の゛小形化や低コスト化の実現
が困難であった。In the above-mentioned light beam scanning optical system, the pitch between the light beams cannot be expanded after deflection, so the pitch between the beams is set as wide as possible so that the mirrors can be separated after deflection. However, it was difficult to achieve high efficiency and cost reduction.
本発明は上記従来技術の問題点を解消することを目的と
してなされたもので、近接した多ビームを偏向器に入射
しても、各光ビームを分離できるほどの光ビーム間ピッ
チとすることができ、これにより偏向器の小形化、fθ
レンズの共用、光学部材の配置の容易性が得られ、装置
を小型で低廉とすることができる光ビーム走査装置を提
供するにある。The present invention has been made with the aim of solving the above-mentioned problems of the prior art, and it is possible to create a pitch between the light beams that is large enough to separate each light beam even when multiple beams that are close to each other are incident on a deflector. This makes the deflector smaller and fθ
It is an object of the present invention to provide a light beam scanning device in which lenses can be shared, optical members can be easily arranged, and the device can be made compact and inexpensive.
上記目的を達成するため、本発明においては、複数の光
ビームを発生させる光ビーム発生手段と、複数の光ビー
ムを共に偏向ざUる偏向器とを有する光ビーム走査装置
にJ3いて、前記偏向器と結像面との間に前記偏向器に
入射する複数ビーム間のピッチを拡大する光ビームピッ
チ拡大光学部材を配置した構成を特徴とする。In order to achieve the above object, the present invention provides a light beam scanning device J3 having a light beam generating means for generating a plurality of light beams and a deflector for deflecting the plurality of light beams together. The present invention is characterized by a configuration in which a light beam pitch enlarging optical member for enlarging the pitch between the plurality of beams incident on the deflector is disposed between the deflector and the image forming surface.
以下、本発明の具体的な実施例を第1図乃至第5図を参
照し、第6図と共通する部材には同一符号を用いて説明
覆る。Hereinafter, specific embodiments of the present invention will be explained with reference to FIGS. 1 to 5, and the same reference numerals will be used for parts common to those in FIG. 6.
第1図に示す実施例は、偏向器1からの光路上にfθレ
ンズ3を有する場合を示し、このfθレンズ3の出射光
路上に光ビームピッチ拡大光学部材7が配置されている
。The embodiment shown in FIG. 1 shows a case where an f.theta. lens 3 is provided on the optical path from the deflector 1, and a light beam pitch enlarging optical member 7 is arranged on the output optical path of the f.theta. lens 3.
上記光学部材7は長手方向に同一断面を有し、第2図に
示す平凹レンズ7′、第3図に示す円柱ミラー7″が用
いられ、また第4図に示ずように出射されるビームを平
行光とするには第5図示のような平凹レンズ7Aと凸平
レンズ7Bとの組合せなどからなるシリンドリカルレン
ズ群が用いられる。なお図示の例においては平行入射の
場合であるが、形状が長手方向に同一断面を有するもの
ぞあれば、これに限定されるものではなく、ビームも2
本以上であってもよい。ここで注gJべき点とし−ては
、副走査方向に光ビーム幅が拡大する問題と像面湾曲が
あるが、これらはいずれも結像光学系全体の設計におい
て工1容範囲内にJ3さえることは容易である。The optical member 7 has the same cross section in the longitudinal direction, and includes a plano-concave lens 7' shown in FIG. 2 and a cylindrical mirror 7'' shown in FIG. 3, and a beam emitted as shown in FIG. 4. In order to make parallel light, a cylindrical lens group consisting of a combination of a plano-concave lens 7A and a convex-plano lens 7B as shown in Figure 5 is used.Although the illustrated example is for parallel incidence, the shape is As long as the beam has the same cross section in the longitudinal direction, it is not limited to this.
It may be more than a book. Points to note here are the problem of the optical beam width expanding in the sub-scanning direction and the curvature of field, but both of these can be kept within the scope of work in the design of the entire imaging optical system. That's easy.
したがって偏向器1を出た光ビームは「θレンズ3を通
ってビームピッチ拡大光学部材7に入り、この光学部材
7によりビームピッチが拡大されてミラー5A、5Bに
到達し、このミラー5A。Therefore, the light beam exiting the deflector 1 passes through the θ lens 3 and enters the beam pitch expanding optical member 7, the beam pitch is expanded by this optical member 7, and reaches the mirrors 5A and 5B.
5Bで光路を変換され、補正レンズ6△、6Bを通って
感光体4A、4Bの感光面に結像される。The optical path of the light is converted at 5B, and the light passes through correction lenses 6Δ and 6B and is imaged onto the photosensitive surfaces of photoreceptors 4A and 4B.
以上説明したように本発明によれば、偏向器と結像面と
の間に、前記偏向器に入射する複数ビーム間のピッチを
拡大する光ビームピッチ拡大光学部材を配置したことに
より、偏向器に近接した多ビームを入射しても各光ビー
ムを分離できるほどの光ビーム問ピッチに拡大すること
ができ、これにより偏向器を小形化することが可能とな
るとともにfθレンズの共用ができ、これらによって装
置仝休を著しく小型に構成づることが可能となり、低価
格化に大きく寄与することができる。As explained above, according to the present invention, a light beam pitch enlarging optical member for enlarging the pitch between a plurality of beams incident on the deflector is disposed between the deflector and the image forming surface. It is possible to expand the pitch of the light beams to the extent that even if multiple beams are incident close to each other, each light beam can be separated.This makes it possible to downsize the deflector and also allows the fθ lens to be shared. These make it possible to make the equipment extremely compact, which can greatly contribute to lower prices.
第1図は本発明の一実施例を承り構成図、第2図、第3
図は第1図における光ビームピッチ拡大光学部材の一例
を示1拡人説明図、第4図は光ビームピッチ拡大光学部
材をシリンドリカルレンズとした場合の構成図、第5図
は第4図にJ3けるシリンドリカルレンズを示す拡大説
明図、第6図は従来の光ビーム走査装置の構成図である
。
1・・・偏向器、3・・・fθレンズ、4A、4B・・
・感光体、5Δ、5B・・・ミラー、6A、6B・・・
補正レンズ、7・・・光ビームピッチ拡大光学部材。
出願人代理人 佐 藤 −雄
第1図
第30
第4図
第5図
第6図Figure 1 is a configuration diagram of an embodiment of the present invention, Figures 2 and 3 are
The figure shows an example of the light beam pitch enlarging optical member in Fig. 1. 1. An enlarged explanatory diagram. Fig. 4 is a configuration diagram when the light beam pitch enlarging optical member is a cylindrical lens. Fig. 5 is the same as Fig. 4. FIG. 6 is an enlarged explanatory view showing a cylindrical lens in J3, and FIG. 6 is a configuration diagram of a conventional light beam scanning device. 1... Deflector, 3... fθ lens, 4A, 4B...
・Photoreceptor, 5Δ, 5B...Mirror, 6A, 6B...
Correction lens, 7... optical beam pitch enlarging optical member. Applicant's agent Mr. Sato Figure 1 Figure 30 Figure 4 Figure 5 Figure 6
Claims (1)
複数の光ビームをと共に偏向させる偏向器とを有する光
ビーム走査装置において、前記偏向器と結像面との間に
前記偏向器に入射する複数ビーム間のピッチを拡大する
光ビームピッチ拡大光学部材を配置したことを特徴とす
る光ビーム走査装置。 2、前記光ビームピッチ拡大光学部材は、長手方向に同
一断面形状を有することを特徴とする特許請求の範囲第
1項記載の光ビーム走査装置。[Claims] 1. A light beam generating means for generating a plurality of light beams;
In a light beam scanning device having a deflector that deflects a plurality of light beams together, a light beam pitch enlarging optical member that enlarges the pitch between the plurality of beams incident on the deflector between the deflector and an image forming surface. A light beam scanning device characterized in that: 2. The light beam scanning device according to claim 1, wherein the light beam pitch enlarging optical member has the same cross-sectional shape in the longitudinal direction.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61029299A JPS62187318A (en) | 1986-02-13 | 1986-02-13 | Light beam scanning device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61029299A JPS62187318A (en) | 1986-02-13 | 1986-02-13 | Light beam scanning device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62187318A true JPS62187318A (en) | 1987-08-15 |
Family
ID=12272357
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61029299A Pending JPS62187318A (en) | 1986-02-13 | 1986-02-13 | Light beam scanning device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62187318A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0258015A (en) * | 1988-08-24 | 1990-02-27 | Canon Inc | Optical scanning device |
JP2002250880A (en) * | 2001-02-26 | 2002-09-06 | Ricoh Opt Ind Co Ltd | Optical scanner and image forming device |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5132650A (en) * | 1974-09-13 | 1976-03-19 | Canon Kk | |
JPS5390949A (en) * | 1977-01-21 | 1978-08-10 | Canon Inc | Scanner |
JPS60188919A (en) * | 1984-03-09 | 1985-09-26 | Comput Basic Mach Technol Res Assoc | Optical device |
-
1986
- 1986-02-13 JP JP61029299A patent/JPS62187318A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5132650A (en) * | 1974-09-13 | 1976-03-19 | Canon Kk | |
JPS5390949A (en) * | 1977-01-21 | 1978-08-10 | Canon Inc | Scanner |
JPS60188919A (en) * | 1984-03-09 | 1985-09-26 | Comput Basic Mach Technol Res Assoc | Optical device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0258015A (en) * | 1988-08-24 | 1990-02-27 | Canon Inc | Optical scanning device |
JP2002250880A (en) * | 2001-02-26 | 2002-09-06 | Ricoh Opt Ind Co Ltd | Optical scanner and image forming device |
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