JPH04246613A - Laser light scanner - Google Patents
Laser light scannerInfo
- Publication number
- JPH04246613A JPH04246613A JP3202191A JP3202191A JPH04246613A JP H04246613 A JPH04246613 A JP H04246613A JP 3202191 A JP3202191 A JP 3202191A JP 3202191 A JP3202191 A JP 3202191A JP H04246613 A JPH04246613 A JP H04246613A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- dust
- synthetic resin
- dustproof plate
- laser beam
- 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
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 20
- 239000000057 synthetic resin Substances 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 14
- 239000000428 dust Substances 0.000 abstract description 17
- 230000005611 electricity Effects 0.000 abstract description 4
- 230000003068 static effect Effects 0.000 abstract description 4
- 230000005540 biological transmission Effects 0.000 abstract 1
- 108091008695 photoreceptors Proteins 0.000 description 3
- 230000001154 acute effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Landscapes
- Laser Beam Printer (AREA)
- Mechanical Optical Scanning Systems (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、レーザープリンタ等に
用いられるレーザー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 a laser beam scanning device used in laser printers and the like.
【０００２】0002
【従来の技術】図５はレーザープリンタ等に用いられる
レーザー光走査装置の従来例の斜視図、図６はそのＡ−
Ａ断面図を示している。平板状で前側面に開口部を有す
る筐体１の左側面後部にレーザー光発生器２が内向きに
取り付けられ、その光軸上にシリドリカルレンズ３、ポ
リゴンミラー４が配置されている。ポリゴンミラー４は
その下部のモータ５により回転駆動されるようになって
おり、ポリゴンミラー４の前方には球面レンズ６、合成
樹脂製のトーリックレンズ７が配設されている。なお、
９、８はそれぞれ走査開始のタイミングを得るための反
射ミラー、光検出器である。2. Description of the Related Art FIG. 5 is a perspective view of a conventional example of a laser beam scanning device used in a laser printer, etc., and FIG.
A sectional view is shown. A laser beam generator 2 is attached facing inward to the rear left side of a flat case 1 having an opening on the front side, and a cylindrical lens 3 and a polygon mirror 4 are arranged on its optical axis. The polygon mirror 4 is rotatably driven by a motor 5 at its lower part, and a spherical lens 6 and a toric lens 7 made of synthetic resin are disposed in front of the polygon mirror 4. In addition,
Reference numerals 9 and 8 are a reflecting mirror and a photodetector, respectively, for obtaining the scanning start timing.
【０００３】レーザー光発生器２から出射されたレーザ
ー光Ｌは、シリドリカルレンズ３を経てポリゴンミラー
４で偏向走査され、球面レンズ６とトーリックレンズ７
で光束を収斂された後に、筐体１の前方に出射されて図
示しない感光体上を走査する。The laser beam L emitted from the laser beam generator 2 passes through a cylindrical lens 3, is deflected and scanned by a polygon mirror 4, and is then scanned by a spherical lens 6 and a toric lens 7.
After the light beam is converged, it is emitted to the front of the housing 1 and scans on a photoreceptor (not shown).
【０００４】0004
【発明が解決しようとする課題】しかしながら上述の従
来例では、トーリックレンズ７が合成樹脂製であるため
帯電し易く、帯電することにより筐体１の外の空気中の
塵埃が引き寄せられて、トーリックレンズ７の表面に付
着すると、走査光束の光量むらが生ずるという問題があ
る。レンズ７の表面に帯電防止膜を蒸着することは可能
であるが、この蒸着は高価であるため、合成樹脂の低価
格であるという長所を損ねることになる。However, in the above-mentioned conventional example, since the toric lens 7 is made of synthetic resin, it is easily charged, and when the toric lens 7 is charged, dust in the air outside the housing 1 is attracted, and the toric lens 7 is made of synthetic resin. If it adheres to the surface of the lens 7, there is a problem in that the amount of light in the scanning light beam becomes uneven. Although it is possible to deposit an antistatic film on the surface of the lens 7, this deposition is expensive, which undermines the low cost advantage of synthetic resin.
【０００５】本発明の目的は、上述の問題点を解消し、
合成樹脂製の光学部材への塵埃の付着が少ないレーザー
光走査装置を提供することにある。The object of the present invention is to solve the above-mentioned problems,
It is an object of the present invention to provide a laser beam scanning device in which less dust adheres to optical members made of synthetic resin.
【０００６】[0006]
【課題を解決するための手段】上述の目的を達成するた
めの本発明に係るレーザー光走査装置は、外気にさらさ
れる合成樹脂製の光学部材を保持するレーザー光走査装
置において、前記光学部材の外気側に前記光学部材と同
一の帯電極性を持つ帯電部材を配置したことを特徴とす
るものである。[Means for Solving the Problems] A laser beam scanning device according to the present invention for achieving the above-mentioned object is a laser beam scanning device that holds an optical member made of synthetic resin and is exposed to the outside air. The device is characterized in that a charging member having the same charging polarity as the optical member is disposed on the outside air side.
【０００７】[0007]
【作用】上述の構成を有するレーザー光走査装置は、通
気部に合成樹脂製の光学部材と帯電極性を同一にした帯
電部材を配置し、筐体の外部から来た塵埃を帯電部材に
付着させる。[Operation] In the laser beam scanning device having the above configuration, a charging member having the same charging polarity as an optical member made of synthetic resin is arranged in the ventilation section, and dust coming from outside the casing is attached to the charging member. .
【０００８】[0008]
【実施例】本発明を図１〜図４に図示の実施例に基づい
て詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail based on the embodiments shown in FIGS. 1 to 4.
【０００９】図１は第１の実施例の断面図を示し、筐体
１１は前面１１ａが開放されており、その内部にはポリ
ゴンミラー１２がモータ１３により回転可能とされ、そ
の前方に球面レンズ１４、トーリックレンズ１５が順次
に設置されている。トーリックレンズ１５は合成樹脂製
であり、その前方に図２に示すようにトーリックレンズ
１５と同じ帯電極性を有する帯電部材である防塵板１６
が設置され、防塵板１６の中央には走査光の通過用とし
て窓１６ａが設けられている。また、窓１６ａの縁部は
静電気が集中し易いように、断面形状は鋭角とされてい
る。FIG. 1 shows a cross-sectional view of the first embodiment, in which a front surface 11a of a housing 11 is open, a polygon mirror 12 is rotatable by a motor 13, and a spherical lens is mounted in front of the polygon mirror 12. 14 and toric lenses 15 are sequentially installed. The toric lens 15 is made of synthetic resin, and as shown in FIG.
A window 16a is provided in the center of the dustproof plate 16 for passing the scanning light. Further, the edge of the window 16a has an acute cross-sectional shape so that static electricity can easily concentrate thereon.
【００１０】図示しない光源から図１の紙面に垂直方向
に出射されたレーザー光Ｌは、ポリゴンミラー１２で反
射されて紙面左方つまり前方に偏向され、球面レンズ１
４、トーリックレンズ１５を経て、窓１６ａを通って筐
体前面１１ａより前方に出射され、図示しない感光体上
を水平方向に走査する。Laser light L emitted from a light source (not shown) in a direction perpendicular to the plane of the paper in FIG.
4. The light passes through the toric lens 15, passes through the window 16a, is emitted forward from the front surface 11a of the housing, and scans a photoreceptor (not shown) in the horizontal direction.
【００１１】トーリックレンズ１５が帯電するときは防
塵板１６も帯電し、前面１１ａから入って来た塵埃は、
この静電気に引き寄せられるが、トーリックレンズ１５
よりも外側に位置する防塵板１６に大部分が付着するた
め、トーリックレンズ１５の表面に付着する塵埃は少な
い。When the toric lens 15 is charged, the dustproof plate 16 is also charged, and the dust entering from the front surface 11a is
Although attracted to this static electricity, toric lenses 15
Since most of the dust adheres to the dustproof plate 16 located on the outer side, less dust adheres to the surface of the toric lens 15.
【００１２】図３は第２の実施例の断面図を示し、筐体
２１の一部に合成樹脂製の光学部材が設けられている。
即ち、筐体２１内の奥にはモータ２２により回転とされ
るポリゴンミラー２３が配置されているが、このポリゴ
ンミラー２３の前方には、第１走査レンズ２４、第２走
査レンズ２５、反射ミラー２６が順次に配置されている
。反射ミラー２６の反射方向である下方には、合成樹脂
製のシリドリカルレンズ２７が筐体２１の底面に固定さ
れ、底面の一部を構成している。シリドリカルレンズ２
７の下方の近傍には、シリドリカルレンズ２７と同極性
の帯電特性を持つ防塵板２８が取り付けられ、この防塵
板２８には走査光通過用の窓２８ａが設けられている。FIG. 3 shows a cross-sectional view of the second embodiment, in which a part of the housing 21 is provided with an optical member made of synthetic resin. That is, a polygon mirror 23 that is rotated by a motor 22 is arranged at the back of the housing 21, and in front of this polygon mirror 23 are a first scanning lens 24, a second scanning lens 25, and a reflecting mirror. 26 are arranged in sequence. A cylindrical lens 27 made of synthetic resin is fixed to the bottom surface of the housing 21 below in the reflection direction of the reflection mirror 26, and forms a part of the bottom surface. Cylindrical lens 2
A dustproof plate 28 having a charging characteristic of the same polarity as the cylindrical lens 27 is attached below and near the cylindrical lens 27, and this dustproof plate 28 is provided with a window 28a for passing the scanning light.
【００１３】この場合も、シリンドリカルレンズ２７に
向かって引き寄せられる塵埃は、手前の防塵板２８に吸
着され、シリンドリカルレンズ２７への付着は少ない。[0013] Also in this case, the dust that is attracted towards the cylindrical lens 27 is attracted to the front dustproof plate 28, so that little dust is attached to the cylindrical lens 27.
【００１４】図４は第３の実施例の断面図を示し、基台
３１の上に筐体３２が取り付けられ、ポリゴンミラー３
３はその外側に配置されている。ポリゴンミラー３３は
基台３１に固定されたモータ３４の軸に取り付けられ、
光通過用の窓を有するカバー３５によって覆われている
。筐体３２はその前方に取り付けられ、内部にガラス製
の第１走査レンズ３６と合成樹脂製の第２走査レンズ３
７が固定され、第２走査レンズ３７の前方には、第２走
査レンズ３７と同極性の帯電特性を持つ防塵板３８が筐
体３２に取り付けられ、その中央は窓３８ａが設けられ
ている。FIG. 4 shows a sectional view of the third embodiment, in which a housing 32 is mounted on a base 31, and a polygon mirror 3 is mounted on a base 31.
3 is placed outside. The polygon mirror 33 is attached to the shaft of a motor 34 fixed to the base 31,
It is covered by a cover 35 having a window for light passage. The housing 32 is attached to the front thereof, and has a first scanning lens 36 made of glass and a second scanning lens 3 made of synthetic resin inside.
7 is fixed, and in front of the second scanning lens 37, a dustproof plate 38 having charging characteristics of the same polarity as the second scanning lens 37 is attached to the housing 32, and a window 38a is provided in the center thereof.
【００１５】ポリゴンミラー３３で偏向されたレーザー
光Ｌは、カバー３５の窓から出射して、筐体３２の後部
の開口部から第１走査レンズ３６に入射し、第２走査レ
ンズ３７を経て、走査光として窓３８ａから図示しない
感光体に向かう。この第３の実施例においても、第２走
査レンズ３７が帯電すると塵埃が前方から引き寄せられ
るが、同時に防塵板３８も帯電しており、殆どが手前に
存在する防塵板３８の表面に付着するため、第２走査レ
ンズ３７への塵埃の付着は少ない。The laser beam L deflected by the polygon mirror 33 is emitted from the window of the cover 35, enters the first scanning lens 36 from the rear opening of the housing 32, passes through the second scanning lens 37, The scanning light is directed from the window 38a toward a photoreceptor (not shown). In this third embodiment as well, when the second scanning lens 37 is charged, dust is attracted from the front, but at the same time the dust-proof plate 38 is also charged, and most of it adheres to the surface of the dust-proof plate 38 in front. , little dust adheres to the second scanning lens 37.
【００１６】上述の何れの実施例においても、合成樹脂
レンズが帯電して塵埃が引き寄せられた場合に、合成樹
脂レンズの近傍の外気に近い側に同様に帯電する防塵板
が配置されているため、塵埃が防塵板の窓を通過しよう
とすると防塵板に引き寄せられ付着する。このため、合
成樹脂レンズには殆ど塵埃が付着せず、通過する光束に
光量むらも生ずることはない。In any of the above-mentioned embodiments, when the synthetic resin lens becomes electrically charged and attracts dust, a dust-proof plate that is similarly electrically charged is placed near the synthetic resin lens on the side closer to the outside air. When dust tries to pass through the window of the dustproof plate, it is attracted to the dustproof plate and adheres to it. Therefore, almost no dust adheres to the synthetic resin lens, and there is no unevenness in the amount of light passing through the lens.
【００１７】なお、以上の実施例では防塵は合成樹脂レ
ンズに対してなされるものとしたが、レンズに限らず他
の種類の合成樹脂製光学部材について行ってもよい。ま
た、防塵板の材質は光学部材と同程度かそれ以上の帯電
容量を持つものが効果的であり、また、光学部材と同種
類の合成樹脂であっても支障はない。In the above embodiments, dustproofing is performed on synthetic resin lenses, but the dustproofing is not limited to lenses, but may be applied to other types of synthetic resin optical members. Furthermore, it is effective to use a material for the dustproof plate that has a charging capacity equal to or greater than that of the optical member, and there is no problem even if it is made of the same type of synthetic resin as the optical member.
【００１８】[0018]
【発明の効果】以上説明したように本発明に係るレーザ
ー光走査装置は、合成樹脂製の光学部材が帯電しても、
塵埃は帯電部材に付着するため、塵埃による光量むらが
生じ難い。[Effects of the Invention] As explained above, the laser beam scanning device according to the present invention has the advantage that even if the optical member made of synthetic resin is charged,
Since dust adheres to the charging member, unevenness in the amount of light due to dust is less likely to occur.
【図１】第１の実施例の断面図である。FIG. 1 is a sectional view of a first embodiment.
【図２】主要部の斜視図である。FIG. 2 is a perspective view of main parts.
【図３】第２の実施例の断面図である。FIG. 3 is a sectional view of a second embodiment.
【図４】第３の実施例の断面図である。FIG. 4 is a sectional view of a third embodiment.
【図５】従来例の斜視図である。FIG. 5 is a perspective view of a conventional example.
【図６】図５のＡ−Ａ線に沿った断面図である。FIG. 6 is a sectional view taken along line AA in FIG. 5;
１１、２１、３２ 筐体 １１ａ 開口部 １５ トーリックレンズ １６、２８、３８ 防塵板 １６ａ、２８ａ、３８ａ 窓 ２７ シリドリカルレンズ ３７ 第２走査レンズ 11, 21, 32 Housing 11a Opening 15 Toric lens 16, 28, 38 Dustproof plate 16a, 28a, 38a windows 27 Cylindrical lens 37 Second scanning lens
Claims (1)
材を保持するレーザー光走査装置において、前記光学部
材の外気側に前記光学部材と同一の帯電極性を持つ帯電
部材を配置したことを特徴とするレーザー光走査装置。1. A laser beam scanning device that holds an optical member made of synthetic resin that is exposed to the outside air, characterized in that a charging member having the same charging polarity as the optical member is disposed on the outside air side of the optical member. A laser beam scanning device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3202191A JPH04246613A (en) | 1991-01-31 | 1991-01-31 | Laser light scanner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3202191A JPH04246613A (en) | 1991-01-31 | 1991-01-31 | Laser light scanner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04246613A true JPH04246613A (en) | 1992-09-02 |
Family
ID=12347212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3202191A Pending JPH04246613A (en) | 1991-01-31 | 1991-01-31 | Laser light scanner |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04246613A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007208420A (en) * | 2006-01-31 | 2007-08-16 | Konica Minolta Medical & Graphic Inc | Condensing optical system and image reading apparatus |
| JP2021028648A (en) * | 2019-08-09 | 2021-02-25 | キヤノン株式会社 | Optical scanner and image formation device using the same |
-
1991
- 1991-01-31 JP JP3202191A patent/JPH04246613A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007208420A (en) * | 2006-01-31 | 2007-08-16 | Konica Minolta Medical & Graphic Inc | Condensing optical system and image reading apparatus |
| JP2021028648A (en) * | 2019-08-09 | 2021-02-25 | キヤノン株式会社 | Optical scanner and image formation device using the same |
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