JPH05127117A - Scanning optical device - Google Patents
Scanning optical deviceInfo
- Publication number
- JPH05127117A JPH05127117A JP29145791A JP29145791A JPH05127117A JP H05127117 A JPH05127117 A JP H05127117A JP 29145791 A JP29145791 A JP 29145791A JP 29145791 A JP29145791 A JP 29145791A JP H05127117 A JPH05127117 A JP H05127117A
- Authority
- JP
- Japan
- Prior art keywords
- polygon mirror
- rotary polygon
- optical box
- upper lid
- rib shape
- 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.)
- Granted
Links
Landscapes
- Mechanical Optical Scanning Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、レーザビームプリン
タ，複写機等の情報記録装置に用いられる走査光学装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanning optical device used in information recording devices such as laser beam printers and copying machines.
【０００２】[0002]
【従来の技術】近年、上記情報記録装置において、高速
化，高精細化が進み、それにともなってレーザスキャナ
の高速化が要求されているが、同時に上記装置の静粛性
が問題となっている。2. Description of the Related Art In recent years, the speed and precision of information recording apparatuses have increased, and along with this, there has been a demand for higher speed of laser scanners, but at the same time, the quietness of the apparatus has become a problem.
【０００３】レーザスキャナの高速化の為に偏向器であ
る回転多面鏡を高速回転する時、騒音源として問題とな
るのが回転多面鏡の風切音である。When a rotating polygon mirror, which is a deflector, is rotated at a high speed in order to increase the speed of a laser scanner, a wind noise of the rotating polygon mirror becomes a problem as a noise source.
【０００４】その対策として従来知られているのが、図
４，及び図５の従来例に示すレーザスキャナ装置であ
る。A laser scanner device shown in the conventional example shown in FIGS. 4 and 5 has been conventionally known as a countermeasure.
【０００５】図４は、レーザビームプリンタにおいて用
いられ、感光体を光束によって走査するための従来の走
査光学装置の構成を説明する平面図であり、偏向面（偏
向器の偏向反射面で偏向された光束が経時的に形成する
光線束面）に平行な断面内での機能を説明するための図
である。又、図５は上記偏向面と垂直な方向のｆθレン
ズ１２の光軸に沿った断面内の様子を示す図である。FIG. 4 is a plan view for explaining the structure of a conventional scanning optical device used in a laser beam printer for scanning a photosensitive member with a light beam, and a deflecting surface (deflected by a deflecting / reflecting surface of a deflector). It is a figure for demonstrating the function in the cross section parallel to the ray bundle surface which the light flux formed with time. Further, FIG. 5 is a diagram showing a state in a cross section along the optical axis of the fθ lens 12 in a direction perpendicular to the deflection surface.
【０００６】走査光学装置は、光源である半導体レーザ
１、前記半導体レーザ１から発生する光束を平行光束に
するコリメータレンズ２、前記コリメータレンズ２から
の平行光束を線状に集光するシリンドリカルレンズ４、
前記シリンドリカルレンズ４によって集光されてできる
光束の線像の近傍に偏光反射面５ａを有する回転多面鏡
５、ｆθレンズ１２等を含んで構成されている。The scanning optical device includes a semiconductor laser 1 as a light source, a collimator lens 2 for collimating a luminous flux generated from the semiconductor laser 1, and a cylindrical lens 4 for linearly condensing the collimated luminous flux from the collimator lens 2. ,
The rotary polygonal mirror 5 having a polarization reflection surface 5a, an fθ lens 12 and the like are included in the vicinity of a line image of a light beam formed by the cylindrical lens 4.
【０００７】偏光反射面５ａにおいて偏向反射された光
束は、ｆθレンズ１２を介して反射鏡１１に入射し、該
反射鏡１１において反射され、光学箱８のレーザビーム
の出射する開口部を通過し、感光体２０を照射する。The light beam deflected and reflected by the polarization reflection surface 5a enters the reflecting mirror 11 through the fθ lens 12, is reflected by the reflecting mirror 11, and passes through the opening of the optical box 8 where the laser beam is emitted. , Irradiate the photoconductor 20.
【０００８】ｆθレンズ１２は、偏向反射面５ａにおい
て反射される光束が感光体２０上においてスポットを形
成するように集光され、また、前記スポットの走査速度
が等速に保れるように設計されている。このようなｆθ
レンズ１２の特性を得るために、該ｆθレンズ１２は球
面レンズ６とトーリックレンズ７の２つのレンズで構成
されている。The fθ lens 12 is designed so that the light beam reflected by the deflecting / reflecting surface 5a is condensed so as to form a spot on the photoconductor 20, and the scanning speed of the spot can be kept constant. ing. Such fθ
In order to obtain the characteristics of the lens 12, the fθ lens 12 is composed of two lenses, a spherical lens 6 and a toric lens 7.
【０００９】光学箱８には光束透過部に一部切り欠きが
ある円環状のリブ形状部８ａが設けられていて、前記回
転多面鏡５はその内周部で回転する構成となっている。
これは前記回転多面鏡５が高速回転する際に、ポンプ作
用によって、回りの空気を吸い寄せ渦流を発生し、その
渦流によって騒音を発生するのを防止する為で、リブ形
状部８ａが回転多面鏡５への空気の供給を制限する事に
よって、騒音レベルを下げるはたらきをする。The optical box 8 is provided with an annular rib-shaped portion 8a having a notch in the light flux transmitting portion, and the rotary polygon mirror 5 is configured to rotate on the inner peripheral portion thereof.
This is because when the rotary polygon mirror 5 rotates at a high speed, the surrounding air is sucked by a pump action to generate a vortex, and noise is generated by the vortex, so that the rib-shaped portion 8a is rotated. It serves to lower the noise level by limiting the air supply to the 5.
【００１０】回転多面鏡５を駆動するモータ部１０及び
モータ部１０に取り付けられた回転多面鏡５は、光学箱
８底面に設けられた開口部８ｂから、光学箱８に対して
取り付けられる構成となっている。The motor section 10 for driving the rotary polygon mirror 5 and the rotary polygon mirror 5 attached to the motor section 10 are attached to the optical box 8 through an opening 8b provided on the bottom surface of the optical box 8. Is becoming
【００１１】３は半導体レーザ１を駆動するためのレー
ザ駆動回路基板である。Reference numeral 3 is a laser drive circuit board for driving the semiconductor laser 1.
【００１２】[0012]
【発明が解決しようとする課題】しかしながら、上記従
来例では、回転多面鏡５を駆動するモータ部１０を光学
箱８内に収容する事が困難な為、次のような欠点があっ
た。However, in the above-mentioned conventional example, it is difficult to house the motor unit 10 for driving the rotary polygon mirror 5 in the optical box 8, and therefore, there are the following drawbacks.
【００１３】（１）モータ部取付が光学箱下方向からと
なり、組立性が悪い。(1) The motor is mounted from the bottom of the optical box, and the assemblability is poor.
【００１４】（２）回転多面鏡付のモータ部を光学箱に
取り付けようとすると、光学箱底面に広い開口部が必要
となり、光学箱の強度が弱くなる。(2) If a motor with a rotating polygon mirror is to be attached to the optical box, a wide opening is required on the bottom of the optical box, and the strength of the optical box is weakened.
【００１５】（３）モータ部のドライブ用のプリント基
板が、光学箱の外にある為、ＩＣのノイズ対策が別途必
要となる。(3) Since the printed circuit board for the drive of the motor section is outside the optical box, it is necessary to separately take measures against the noise of the IC.
【００１６】[0016]
【課題を解決するための手段】本発明によれば、光学箱
の上蓋側に円環状のリブ形状を設ける事により、そのリ
ブ形状により回転多面鏡を囲み、回転多面鏡への空気の
供給を制限するようにしたものである。According to the present invention, by providing an annular rib shape on the upper lid side of the optical box, the rotary polygon mirror is surrounded by the rib shape, and air is supplied to the rotary polygon mirror. It is intended to be limited.
【００１７】[0017]
【実施例】図１は本発明の走査光学装置の第１実施例の
構成を説明する断面図、図２は平面図である。装置の基
本的な構成は先に図４及び図５で説明した装置と同様で
あるので、同一の機能を有する部材には、同一の符号を
付し説明は省略する。1 is a sectional view for explaining the structure of a first embodiment of a scanning optical device of the present invention, and FIG. 2 is a plan view. Since the basic configuration of the device is the same as that of the device described above with reference to FIGS. 4 and 5, members having the same functions are designated by the same reference numerals and description thereof will be omitted.
【００１８】光学箱８には、該箱内部に、箱上方向から
回転多面鏡５を有するモータ部１０が取付けられてい
て、モータ部１０の駆動回路基板１０ａも、光学箱内に
納められている。光学箱８の上部には、上蓋９が爪嵌合
（図示せず）によって取り付けられていて、上蓋９には
光束透過部に一部切欠きのある円環状のリブ形状９ａが
設けられている。リブ形状９ａは回転多面鏡５及びモー
タのロータ部を囲むように、上蓋９上に一体成形されて
いる。A motor unit 10 having a rotary polygon mirror 5 is attached to the inside of the optical box 8 from above the box, and a drive circuit board 10a of the motor unit 10 is also housed in the optical box. There is. An upper lid 9 is attached to the upper portion of the optical box 8 by a claw fitting (not shown), and the upper lid 9 is provided with an annular rib shape 9a having a notch in a light flux transmitting portion. .. The rib shape 9a is integrally formed on the upper lid 9 so as to surround the rotary polygon mirror 5 and the rotor portion of the motor.
【００１９】図３は本発明の走査光学装置の第２実施例
の外観説明図で、上蓋９の回転多面鏡５を囲むリブ形状
部９ｂは、透明部材により、２色成形されている為、切
欠きのない円環形状とする事が出来、回転多面鏡部の密
閉性に優れている。FIG. 3 is an external view for explaining the second embodiment of the scanning optical device of the present invention. The rib-shaped portion 9b surrounding the rotary polygon mirror 5 of the upper lid 9 is formed of a transparent member in two colors. It can be made into a ring shape without notches, and has excellent sealing performance for the rotating polygon mirror.
【００２０】[0020]
【発明の効果】以上説明したように、本発明は、光源部
からの光束を回転多面鏡によって被走査面を走査する走
査光学装置であって、前記回転多面鏡を上蓋に一体成形
したリブ形状で囲う構成とする事によって、回転多面鏡
への空気の供給を制限し、騒音を小さくするようにした
ものである。As described above, the present invention is a scanning optical device that scans a surface to be scanned with a light beam from a light source section by means of a rotary polygon mirror, and has a rib shape in which the rotary polygon mirror is integrally formed on an upper lid. By enclosing it with a structure, the air supply to the rotary polygon mirror is restricted and the noise is reduced.
【００２１】又、このような構成をとることによって、
回転多面鏡のモータ部をすべて光学箱内に収容する事が
可能となった為、組立性の改善、光学箱の強度増加、モ
ータドライブＩＣからのノイズ遮蔽などの点で効果があ
る。Further, by adopting such a configuration,
Since the motor part of the rotary polygon mirror can be housed in the optical box, it is effective in terms of improving the assembling property, increasing the strength of the optical box, and shielding noise from the motor drive IC.
【図１】本発明の走査光学装置の第１実施例の構成を説
明する断面図である。FIG. 1 is a sectional view illustrating the configuration of a first embodiment of a scanning optical device of the present invention.
【図２】本発明の走査光学装置の第１実施例の構成を説
明する平面図である。FIG. 2 is a plan view illustrating the configuration of the first embodiment of the scanning optical device of the present invention.
【図３】本発明の走査光学装置の第２実施例の構成を説
明する斜視図である。FIG. 3 is a perspective view illustrating the configuration of a second embodiment of the scanning optical device of the present invention.
【図４】従来の走査光学装置の構成を説明する平面図で
ある。FIG. 4 is a plan view illustrating a configuration of a conventional scanning optical device.
【図５】従来の走査光学装置の構成を説明する断面図で
ある。FIG. 5 is a cross-sectional view illustrating the configuration of a conventional scanning optical device.
１ 半導体レーザ ５ 回転多面鏡 ８ 光学箱 ９ 上蓋 １０ モータ部 ２０ 感光体 1 Semiconductor Laser 5 Rotating Polygonal Mirror 8 Optical Box 9 Upper Lid 10 Motor Section 20 Photoreceptor
Claims (1)
被走査面上を走査する走査光学装置であって、前記偏向
器が光学箱内に取りつけられ前記光学箱は上蓋により封
止されたものにおいて、前記偏向器は上蓋に形成された
円環状のリブ形状で囲まれている事を特徴とする走査光
学装置。1. A scanning optical device for deflecting a light beam from a light source section by a deflector to scan a surface to be scanned, wherein the deflector is mounted in an optical box, and the optical box is sealed by an upper lid. The scanning optical device according to claim 1, wherein the deflector is surrounded by an annular rib shape formed on an upper lid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29145791A JP2962901B2 (en) | 1991-11-07 | 1991-11-07 | Scanning optical device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29145791A JP2962901B2 (en) | 1991-11-07 | 1991-11-07 | Scanning optical device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05127117A true JPH05127117A (en) | 1993-05-25 |
| JP2962901B2 JP2962901B2 (en) | 1999-10-12 |
Family
ID=17769120
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29145791A Expired - Lifetime JP2962901B2 (en) | 1991-11-07 | 1991-11-07 | Scanning optical device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2962901B2 (en) |
-
1991
- 1991-11-07 JP JP29145791A patent/JP2962901B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP2962901B2 (en) | 1999-10-12 |
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