JP2587956Y2 - Light beam shielding structure of optical scanning device - Google Patents
Light beam shielding structure of optical scanning deviceInfo
- Publication number
- JP2587956Y2 JP2587956Y2 JP1992024475U JP2447592U JP2587956Y2 JP 2587956 Y2 JP2587956 Y2 JP 2587956Y2 JP 1992024475 U JP1992024475 U JP 1992024475U JP 2447592 U JP2447592 U JP 2447592U JP 2587956 Y2 JP2587956 Y2 JP 2587956Y2
- Authority
- JP
- Japan
- Prior art keywords
- light beam
- housing
- opening
- optical scanning
- light
- 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.)
- Expired - Fee Related
Links
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
- Electrophotography Configuration And Component (AREA)
- Dot-Matrix Printers And Others (AREA)
- Laser Beam Printer (AREA)
- Mechanical Optical Scanning Systems (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は、レーザプリンタ等の光
学走査装置における光ビームの遮光構造に関するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light beam shielding structure in an optical scanning device such as a laser printer.
【０００２】[0002]
【従来の技術】ハウジングと、このハウジングに開閉可
能に取着された開閉カバーとを備え、ハウジングには感
光ドラムが配設され、開閉カバーには、感光ドラムに向
けて走査光ビームを出射する光走査ユニットが配設され
たレーザプリンタでは、光走査ユニットからの走査光ビ
ームを感光ドラム側に出射させるための出射窓が開閉カ
バーに設けられる。ところで、このような構成のレーザ
プリンタでは、メンテナンス等で開閉カバーを開けた時
に誤って出射窓から走査光ビームが出射されていると、
その走査光ビームがユーザの目に照射されてしまう危険
がある。そこで従来は、光走査ユニットの出射窓に長尺
のシャッタを揺動自在に設け、開閉カバーを開けたとき
にシャッタを揺動させて出射窓を塞ぐようにしていた。2. Description of the Related Art A housing and an opening / closing cover attached to the housing so as to be openable and closable are provided. A photosensitive drum is disposed in the housing, and the opening / closing cover emits a scanning light beam toward the photosensitive drum. In a laser printer provided with an optical scanning unit, an emission window for emitting a scanning light beam from the optical scanning unit to the photosensitive drum side is provided in the opening / closing cover. By the way, in the laser printer having such a configuration, when the scanning light beam is erroneously emitted from the emission window when the opening / closing cover is opened for maintenance or the like,
There is a risk that the scanning light beam is irradiated to the user's eyes. Therefore, conventionally, a long shutter is swingably provided on the emission window of the optical scanning unit, and the shutter is swung to close the emission window when the opening / closing cover is opened.
【０００３】[0003]
【考案が解決しようとする課題】しかしながら、上述し
た従来の遮光構造では、開閉カバーを開けたときに光走
査ユニットの出射窓を塞ぐ別部品が必要となるので、部
品点数や組立工数が増えてしまいコストダウンを図るこ
とができないという不具合があった。また従来は、出射
窓において走査偏向された走査光ビームを遮光していた
ので、出射窓の長さ、つまり走査光ビームの主走査範囲
の広さに応じた長尺のシャッタが必要となり、シャッタ
の構造が大掛かりとなる不具合があった。However, in the above-described conventional light-shielding structure, when the opening / closing cover is opened, another part for closing the emission window of the optical scanning unit is required, so that the number of parts and the number of assembly steps increase. As a result, there was a problem that the cost could not be reduced. Conventionally, the scanning light beam scanned and deflected in the emission window is shielded, so that a long shutter corresponding to the length of the emission window, that is, the width of the main scanning range of the scanning light beam is required. There was a problem that the structure was large.
【０００４】本考案は上述の問題に鑑みてなされたもの
で、開閉カバーを開けたときに光ビームを遮光するシャ
ッタを他の部品と一体に形成できるようにして、部品点
数や組立工数を削減し装置のコストダウンを図ることが
できる光学走査装置の光ビーム遮光構造を提供すること
を目的とする。また本考案は、シャッタの構成をコンパ
クトにすることができる光学走査装置の光ビーム遮光構
造を提供することを目的とする。The present invention has been made in view of the above-mentioned problems, and a shutter for blocking a light beam when an opening / closing cover is opened can be integrally formed with other parts, thereby reducing the number of parts and the number of assembly steps. It is an object of the present invention to provide a light beam shielding structure of an optical scanning device capable of reducing the cost of a scanning device. Another object of the present invention is to provide a light beam shielding structure of an optical scanning device that can make the configuration of a shutter compact.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
本考案は、ハウジングと、前記ハウジングに開閉可能に
取着された開閉カバーと、光源からの光ビームを光偏向
器で走査偏向して、該走査偏向された光ビームを走査対
象に向けて出射する光走査ユニットと、前記光走査ユニ
ットを収容し、前記ハウジング及び開閉カバーの一つに
取着された光走査ユニット用ハウジングと、前記ハウジ
ング、開閉カバー、及び光走査ユニット用ハウジングの
一つに設けられたシャッタを備え、前記シャッタは、前
記ハウジング、開閉カバー、及び光走査ユニット用ハウ
ジングの一つの、開閉カバーの開閉方向を横切る平面に
形成された切り欠きにより縁取られて、該ハウジング、
開閉カバー、及び光走査ユニット用ハウジングの一つに
一体に形成され、前記シャッタは、前記開閉カバーを閉
じた時に前記ハウジング及び開閉カバーの一つに当接し
て弾性変形し光ビームを通過させ、前記開閉カバーを開
けた時に元位置に弾性復帰し光ビームを遮光するように
構成されていることを特徴とする。In order to achieve the above object, the present invention provides a housing, an opening and closing cover attached to the housing so as to be openable and closable, and a light beam from a light source which is scanned and deflected by an optical deflector. An optical scanning unit that emits the scan-deflected light beam toward a scanning target, an optical scanning unit housing that houses the optical scanning unit, and is attached to one of the housing and the openable cover, A housing, an opening / closing cover, and a shutter provided on one of the optical scanning unit housings, wherein the shutter is a plane crossing the opening / closing direction of the opening / closing cover of one of the housing, the opening / closing cover, and the optical scanning unit housing. Rimmed by a notch formed in the housing,
An opening / closing cover, and formed integrally with one of the optical scanning unit housings, wherein the shutter abuts on the housing and the opening / closing cover when the opening / closing cover is closed to elastically deform and allow the light beam to pass therethrough; When the opening / closing cover is opened, it is configured to elastically return to the original position and block the light beam.
【０００６】[0006]
【実施例】以下、本考案の実施例を図面に基づいて説明
する。図１は本考案の第１実施例による遮光構造を採用
したレーザプリンタの概略構成を示す要部截断斜視図で
ある。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cutaway perspective view of a main part showing a schematic configuration of a laser printer employing a light shielding structure according to a first embodiment of the present invention.
【０００７】図１において１０は光学走査装置としての
レーザプリンタである。このレーザプリンタ１０はハウ
ジング２０と、ハウジング２０に開閉可能に取着された
開閉カバー３０とを備えており、ハウジング２０には走
査対象としての感光ドラム（図示せず）を含む印刷部２
１が収容されており、開閉カバー３０には図１及び図２
に示すように光走査ユニット１００が取着されている。In FIG. 1, reference numeral 10 denotes a laser printer as an optical scanning device. The laser printer 10 includes a housing 20 and an opening / closing cover 30 attached to the housing 20 so as to be openable and closable. The housing 20 includes a printing unit 2 including a photosensitive drum (not shown) to be scanned.
1 and FIG.
The optical scanning unit 100 is attached as shown in FIG.
【０００８】光走査ユニット１００は図３に示すよう
に、ユニット用ハウジング１１０とユニット用ハウジン
グ１１０の開口を塞ぐユニットカバー１２０とを備えて
おり、図１に示すようにユニット用ハウジング１１０の
底部１１１が開閉カバー３０に対して取着されている。
そして、ユニット用ハウジング１１０内には図３に示す
ように、光ビームＢ１を出力する例えばコリメータユニ
ット等の光源２０１と、光源２０１から出射される光ビ
ームＢ１を主走査方向Ｎに走査偏向する光偏向器２０２
と、光偏向器２０２により走査偏向された走査光ビーム
Ｂ２を印刷部２１の図示しない感光ドラム上に集束させ
るｆθレンズ２０３と、ｆθレンズ２０３を透過した走
査光ビームＢ２を印刷部２１に向けて反射させる反射ミ
ラー２０４とが配設されている。The optical scanning unit 100 has a unit housing 110 and a unit cover 120 for closing the opening of the unit housing 110 as shown in FIG. 3, and a bottom 111 of the unit housing 110 as shown in FIG. Is attached to the opening / closing cover 30.
As shown in FIG. 3, a light source 201 such as a collimator unit that outputs a light beam B1 and light that scans and deflects the light beam B1 emitted from the light source 201 in the main scanning direction N are provided in the unit housing 110, as shown in FIG. Deflector 202
And a fθ lens 203 for converging the scanning light beam B2 scanned and deflected by the optical deflector 202 on a photosensitive drum (not shown) of the printing unit 21 and the scanning light beam B2 transmitted through the fθ lens 203 toward the printing unit 21 A reflection mirror 204 for reflecting light is provided.
【０００９】また、ユニット用ハウジング１１０の底部
１１１には図１及び図３に示すように、反射ミラー２０
４で反射された走査光ビームＢ２を出射させるための出
射窓１１２が形成されており、さらに、開閉カバー３０
の開閉方向を横切る平面をなす前記底部１１１には図４
及び図５に示すように、光源２０１から光偏向器２０２
に至る光ビームＢ１が臨む箇所に平面略コ字状の切欠１
１３が形成されていて、この切欠１１３により縁取られ
て、ユニット用ハウジング１１０の底部１１１の厚さ方
向に弾性変形可能な弾性部１１４が底部１１１に一体に
形成されている。さらに、図４に示すように、ユニット
用ハウジング１１０の内部側に面する弾性部１１４の面
１１４ａには遮光部１１５が立設され、反対側の面１１
４ｂには脚体１１６が垂設されている。尚、本実施例で
は弾性部１１４、遮光部１１５、及び脚体１１６でシャ
ッタを形成しているAs shown in FIGS. 1 and 3, a reflecting mirror 20 is provided on the bottom 111 of the unit housing 110.
An emission window 112 for emitting the scanning light beam B2 reflected by the light source 4 is formed.
FIG. 4 shows that the bottom 111, which forms a plane
As shown in FIG. 5 and FIG.
A substantially U-shaped notch 1 at the position where the light beam B1 reaching
An elastic portion 114, which is formed by a cutout 113 and is elastically deformable in the thickness direction of the bottom 111 of the unit housing 110, is formed integrally with the bottom 111. Further, as shown in FIG. 4, a light shielding portion 115 is provided upright on a surface 114a of the elastic portion 114 facing the inside of the unit housing 110, and the opposite surface 11a is provided.
A leg 116 is suspended from 4b. In this embodiment, a shutter is formed by the elastic portion 114, the light shielding portion 115, and the leg 116.
【００１０】一方、開閉カバー３０には図２に示すよう
に、脚体１１６をハウジング２０側に突出させるための
通孔３１が形成されており、また図１に示すように、前
記出射窓１１２が臨む箇所に出射窓１１２と略同形の窓
３２が形成されている。さらに、ハウジング２０には図
１及び図２に示すように、開閉カバー３０を閉じた時に
脚体１１６が臨む箇所に突起２２が設けられており、こ
の突起２２には図６に示すように、脚体１１６の先端が
当接可能な円弧状の凹部２２ａが形成されている。On the other hand, as shown in FIG. 2, the opening / closing cover 30 has a through hole 31 for projecting the leg 116 toward the housing 20, and as shown in FIG. A window 32 having substantially the same shape as the emission window 112 is formed at a position where the window 32 faces. Further, as shown in FIGS. 1 and 2, the housing 20 is provided with a protrusion 22 at a position where the leg 116 faces when the cover 30 is closed. As shown in FIG. An arc-shaped concave portion 22a with which the tip of the leg body 116 can contact is formed.
【００１１】このような構成によるレーザプリンタ１０
では、開閉カバー３０を開けた時には、図６に示すよう
に脚体１１６が突起２２の凹部２２ａから離間し弾性部
１１４が弾性変形していない元位置にあるので、図４に
示すように遮光部１１５が光源２０１から光偏向器２０
２に至る光ビームＢ１を遮光し、出射窓１１２，３２か
らの走査光ビームＢ２の出射が妨げられる。The laser printer 10 having such a configuration
When the opening / closing cover 30 is opened, the leg 116 is separated from the concave portion 22a of the projection 22 and the elastic portion 114 is at the original position where the elastic portion 114 is not elastically deformed as shown in FIG. The unit 115 is connected to the light deflector 20 from the light source 201.
2, the light beam B1 is blocked, and the emission of the scanning light beam B2 from the emission windows 112 and 32 is prevented.
【００１２】これに対して、開閉カバー３０を閉じる
と、まず図７に示すように脚体１１６の先端が突起２２
の凹部２２ａに当接し、さらに開閉カバー３０を閉じる
と図８に示すように弾性部１１４がユニット用ハウジン
グ１１０の内部方向に弾性変形して、光源２０１から出
力された光ビームＢ１が図５に示すように弾性部１１
４、脚体１１６、及びユニット用ハウジング１１０の底
部１１１で画成される空間Ｄを透過して光偏向器２０２
に至る。このため、開閉カバー３０を閉じた時には出射
窓１１２，３２からハウジング２０の印刷部２１に向け
て走査光ビームＢ２が出射される。On the other hand, when the cover 30 is closed, first, as shown in FIG.
When the opening / closing cover 30 is further closed and the opening / closing cover 30 is closed, the elastic portion 114 is elastically deformed in the direction toward the inside of the unit housing 110 as shown in FIG. 8, and the light beam B1 output from the light source 201 is changed to the state shown in FIG. As shown, the elastic part 11
4, the light deflector 202 through the space D defined by the legs 116 and the bottom 111 of the unit housing 110.
Leads to. Therefore, when the opening / closing cover 30 is closed, the scanning light beam B <b> 2 is emitted from the emission windows 112 and 32 toward the printing unit 21 of the housing 20.
【００１３】尚、図８の状態から開閉カバー３０を開け
ると、弾性部１１４が弾性力により図６に示す元位置に
復帰し、遮光部１１５により光ビームＢ１が再び遮光さ
れて、出射窓１１２，３２からの走査光ビームＢ２の出
射が妨げられる。When the opening / closing cover 30 is opened from the state shown in FIG. 8, the elastic portion 114 returns to the original position shown in FIG. 6 by the elastic force, and the light beam B1 is shielded again by the light shielding portion 115. , 32 are prevented from being emitted from the scanning light beam B2.
【００１４】このように、本実施例の遮光構造によれ
ば、開閉カバー３０の開閉に応じてユニット用ハウジン
グ１１０の出射窓１１２乃至開閉カバー３０の窓３２か
らの走査光ビームＢ２の出射を妨げ、或は出射窓１１２
乃至窓３２から走査光ビームＢ２を出射させるシャッ
タ、つまり弾性部１１４、遮光部１１５、及び脚体１１
６を、ユニット用ハウジング１１０の底部１１１に一体
に設けることができるので、従来のような別部品を不要
とすることができ、部品点数及び組立工数の削減やそれ
によるコストダウンを図ることができる。また、開閉カ
バー３０の開閉に応じて弾性部１１４が弾性変形し或は
元位置に弾性復帰して、遮光部１１５が光源２０１から
光偏向器２０２に至る光ビームＢ１の光路中へ進出、或
は光路中から退避するので、従来の、走査光ビームの主
走査範囲の広さに応じた長尺のシャッタで出射窓を開閉
する構成に比べてコンパクトな構成とすることができ
る。As described above, according to the light shielding structure of the present embodiment, the emission of the scanning light beam B2 from the emission window 112 of the unit housing 110 to the window 32 of the opening / closing cover 30 in accordance with the opening / closing of the opening / closing cover 30 is prevented. Or the exit window 112
Or a shutter for emitting the scanning light beam B2 from the window 32, that is, the elastic portion 114, the light shielding portion 115, and the leg 11
6 can be provided integrally with the bottom 111 of the unit housing 110, so that separate parts as in the related art can be dispensed with, and the number of parts and the number of assembling steps can be reduced, thereby reducing costs. . In addition, the elastic portion 114 is elastically deformed or elastically returns to the original position according to the opening and closing of the opening / closing cover 30, and the light shielding portion 115 advances into the optical path of the light beam B1 from the light source 201 to the optical deflector 202, or Is retracted from the optical path, so that the configuration can be made more compact than the conventional configuration in which the emission window is opened and closed by a long shutter corresponding to the width of the main scanning range of the scanning light beam.
【００１５】尚、弾性部１１４、遮光部１１５、脚体１
１６、及び突起２２の形状は本実施例で示したものに限
定されず、例えば図９及び図１０に示す本考案の第２実
施例のように、弾性部１１４の先端に、ユニット用ハウ
ジング１１０の底部１１１から内外両側に突出する遮光
部１１７を設け、この遮光部１１７の下部に半円状の凹
部１１７ａを形成する一方、ハウジング２０側に突起２
３を設け、この突起２３の上部に半円状の凹部２３ａを
形成する構成としてもよい。The elastic part 114, the light shielding part 115, the leg 1
The shapes of the projections 16 and the projections 22 are not limited to those shown in the present embodiment. For example, as in the second embodiment of the present invention shown in FIGS. A light-shielding portion 117 protruding from the bottom 111 to both the inside and the outside is provided. A semi-circular recess 117a is formed below the light-shielding portion 117, while a projection 2 is formed on the housing 20 side.
3 may be provided, and a semicircular concave portion 23 a may be formed above the protrusion 23.
【００１６】この構成によれば、開閉カバー３０を開け
た時には図９に示すように、遮光部１１７が光源２０１
と光偏向器２０２との間の光ビームＢ１を遮光し、出射
窓１１２乃至窓３２からの走査光ビームＢ２の出射が妨
げられる。一方、開閉カバー３０を閉じると図１０に示
すように、遮光部１１７に突起２３が当接、押圧されて
弾性部１１４がユニット用ハウジング１１０の内側に弾
性変形し、遮光部１１７の凹部１１７ａと突起２３の凹
部２３ａとで円形の通孔Ｅが画成される。そして、光源
２０１から出力された光ビームＢ１が通孔Ｅを通過して
光偏向器２０２に至り、出射窓１１２乃至窓３２からハ
ウジング２０の印刷部２１に向けて走査光ビームＢ２が
出射される。According to this configuration, when the open / close cover 30 is opened, as shown in FIG.
The light beam B1 between the optical deflector 202 and the light deflector 202 is shielded, and the emission of the scanning light beam B2 from the emission windows 112 to 32 is prevented. On the other hand, when the opening / closing cover 30 is closed, as shown in FIG. 10, the projection 23 comes into contact with and is pressed against the light shielding portion 117, and the elastic portion 114 is elastically deformed inside the unit housing 110. A circular through hole E is defined by the recess 23 a of the projection 23. Then, the light beam B1 output from the light source 201 passes through the through hole E to reach the optical deflector 202, and the scanning light beam B2 is emitted from the emission windows 112 to 32 toward the printing unit 21 of the housing 20. .
【００１７】また、図１１及び図１２に示す本考案の第
３実施例のように、弾性部１１４をユニット用ハウジン
グ１１０の底部１１１よりも外側に折曲し、この弾性部
１１４の先端に、ユニット用ハウジング１１０の内側に
突出する遮光部１１８を設けると共に、遮光部１１８の
下部に半円状の凹部１１８ａを形成する一方、ハウジン
グ２０側に突起２４を設ける構成としてもよい。Also, as in the third embodiment of the present invention shown in FIGS. 11 and 12, the elastic portion 114 is bent outward from the bottom 111 of the unit housing 110, and the distal end of the elastic portion 114 The light shielding portion 118 protruding inside the unit housing 110 may be provided, and a semicircular concave portion 118a may be formed below the light shielding portion 118, while the projection 24 may be provided on the housing 20 side.
【００１８】この構成によれば、開閉カバー３０を開け
た時には図１１に示すように、遮光部１１８が光源２０
１と光偏向器２０２との間の光ビームＢ１を遮光し、出
射窓１１２乃至窓３２からの走査光ビームＢ２の出射が
妨げられる。一方、開閉カバー３０を閉じると図１２に
示すように、遮光部１１８に突起２４が当接、押圧され
て弾性部１１４がユニット用ハウジング１１０の内側に
弾性変形し、遮光部１１８の凹部１１８ａが光源２０１
から出力された光ビームＢ１の光路中に延出する。そし
て、光ビームＢ１がこの凹部１１８ａを通過して光偏向
器２０２に至り、出射窓１１２乃至窓３２からハウジン
グ２０の印刷部２１に向けて走査光ビームＢ２が出射さ
れる。According to this configuration, when the open / close cover 30 is opened, as shown in FIG.
The light beam B1 between the light deflector 202 and the light deflector 202 is shielded, and the emission of the scanning light beam B2 from the emission windows 112 to 32 is prevented. On the other hand, when the cover 30 is closed, as shown in FIG. 12, the projection 24 comes into contact with and is pressed against the light shielding portion 118, and the elastic portion 114 is elastically deformed inside the unit housing 110. Light source 201
Extend into the optical path of the light beam B1 output from the optical disk. Then, the light beam B1 passes through the concave portion 118a and reaches the optical deflector 202, and the scanning light beam B2 is emitted from the emission windows 112 to 32 toward the printing portion 21 of the housing 20.
【００１９】ちなみに、上記第２実施例の構成において
は弾性部１１４と遮光部１１７とでシャッタを形成して
おり、上記第３実施例の構成においては弾性部１１４と
遮光部１１８とでシャッタを形成している。そして、上
記第２及び第３実施例の構成によっても第１実施例と同
様の効果を得ることができ、特に、第３実施例の構成に
よれば、開閉カバー３０を閉じるのに伴って弾性部１１
４が弾性変形すると、切欠１１３の形成によりユニット
用ハウジング１１０の底部１１１に形成された孔が、弾
性変形した弾性部１１４と遮光部１１８とにより略々塞
がれ、ユニット用ハウジング１１０外からの不要な光の
漏光を防止することが可能となると共に、通常動作中に
は塵埃等のユニット用ハウジング１１０内への侵入を最
小限にすることができる。Incidentally, in the configuration of the second embodiment, a shutter is formed by the elastic portion 114 and the light shielding portion 117. In the configuration of the third embodiment, the shutter is formed by the elastic portion 114 and the light shielding portion 118. Has formed. The same effects as those of the first embodiment can be obtained by the configurations of the second and third embodiments. In particular, according to the configuration of the third embodiment, the elasticity of the opening and closing cover 30 is increased as the cover 30 is closed. Part 11
When the elastic member 4 is elastically deformed, the hole formed in the bottom 111 of the unit housing 110 due to the formation of the notch 113 is substantially closed by the elastically deformed elastic portion 114 and the light shielding portion 118, and the hole from the outside of the unit housing 110 is formed. Unnecessary light leakage can be prevented, and intrusion of dust and the like into the unit housing 110 during normal operation can be minimized.
【００２０】尚、上記各実施例では、弾性部１１４、遮
光部１１５，１１７，１１８、及び脚体１１６がユニッ
ト用ハウジング１１０に設けられている構成としたが、
これらを開閉カバー３０に設け、ユニット用ハウジング
１１０に少なくとも遮光部１１５，１１７，１１８を光
ビームＢ１の光路中に出没させるための通孔を設けても
よい。In each of the above embodiments, the elastic portion 114, the light shielding portions 115, 117, 118, and the legs 116 are provided in the unit housing 110.
These may be provided on the opening / closing cover 30, and a through hole may be provided in the unit housing 110 so that at least the light shielding portions 115, 117, and 118 appear and disappear in the optical path of the light beam B1.
【００２１】また、上記各実施例では光走査ユニット１
００が開閉カバー３０に設けられている場合について説
明したが、開閉カバー３０に突起を設け、光走査ユニッ
ト１００のユニットカバー１２０に弾性部や遮光部（及
び脚体）を形成すれば、光走査ユニット１００がハウジ
ング２０に設けられている光学走査装置にも本考案を適
用することができる。さらに、上記各実施例では、開閉
カバー３０を開けた時に遮光部１１５，１１７，１１８
が光源２０１と光偏向器２０２との間の光ビームＢ１を
遮光する構成としたが、弾性部や遮光部を光偏向器２０
２とｆθレンズ２０３との間やｆθレンズ２０３と反射
ミラー２０４との間に設け、開閉カバー３０を開けた時
に遮光部が走査光ビームＢ２を主走査方向Ｎの全幅に亘
って遮光する構成としてもよい。In each of the above embodiments, the light scanning unit 1
Although the case where 00 is provided on the opening / closing cover 30 has been described, if a projection is provided on the opening / closing cover 30 and the unit cover 120 of the optical scanning unit 100 is formed with an elastic portion or a light shielding portion (and a leg), optical scanning can be performed. The present invention can be applied to an optical scanning device in which the unit 100 is provided in the housing 20. Furthermore, in each of the above embodiments, when the opening / closing cover 30 is opened, the light shielding portions 115, 117, 118
Has a configuration in which the light beam B1 between the light source 201 and the optical deflector 202 is shielded.
2 and between the fθ lens 203 and between the fθ lens 203 and the reflection mirror 204, and the light blocking unit blocks the scanning light beam B 2 over the entire width in the main scanning direction N when the opening / closing cover 30 is opened. Is also good.
【００２２】そして、上記各実施例では光学走査装置と
してレーザプリンタを例に取って説明したが、本考案の
遮光構造は、その他の例えばイメージスキャナやレーザ
フォトプロッタ等においても適用可能であることは勿論
のことである。In each of the above embodiments, a laser printer has been described as an example of an optical scanning device. However, the light-shielding structure of the present invention can be applied to other devices such as an image scanner and a laser photoplotter. Of course.
【００２３】[0023]
【考案の効果】以上説明したように本考案によれば、ハ
ウジングと、前記ハウジングに開閉可能に取着された開
閉カバーと、光源からの光ビームを光偏向器で走査偏向
して、該走査偏向された光ビームを走査対象に向けて出
射する光走査ユニットと、前記光走査ユニットを収容
し、前記ハウジング及び開閉カバーの一つに取着された
光走査ユニット用ハウジングと、前記ハウジング、開閉
カバー、及び光走査ユニット用ハウジングの一つに設け
られたシャッタを備え、前記シャッタは、前記ハウジン
グ、開閉カバー、及び光走査ユニット用ハウジングの一
つの、開閉カバーの開閉方向を横切る平面に形成された
切り欠きにより縁取られて、該ハウジング、開閉カバ
ー、及び光走査ユニット用ハウジングの一つに一体に形
成され、前記シャッタは、前記開閉カバーを閉じた時に
前記ハウジング及び開閉カバーの一つに当接して弾性変
形し光ビームを通過させ、前記開閉カバーを開けた時に
元位置に弾性復帰し光ビームを遮光するように構成され
ている構成とした。このため、ハウジング、開閉カバ
ー、及び光走査ユニット用ハウジングの一つにシャッタ
が一体に形成され、遮光用の別部品を不要として部品点
数及び組立工数の削減やそれによるコストダウンを図る
ことができる。また、本考案によれば、前記シャッタが
前記光源と光偏向器との間において前記光ビームを通
過、遮光する構成としたので、走査偏向された光ビーム
をその主走査範囲の広さに応じた大きさのシャッタで遮
光する構成に比べてシャッタをコンパクトな構成とする
ことができる。As described above, according to the present invention, the housing, the opening / closing cover attached to the housing so as to be openable and closable, and the light beam from the light source are scanned and deflected by the optical deflector to perform the scanning. An optical scanning unit that emits the deflected light beam toward the object to be scanned, a housing for the optical scanning unit that houses the optical scanning unit, and is attached to one of the housing and the opening and closing cover; A cover, and a shutter provided on one of the optical scanning unit housings, wherein the shutter is formed on a plane crossing the opening / closing direction of the opening / closing cover of one of the housing, the opening / closing cover, and the optical scanning unit housing. And the shutter is formed integrally with one of the housing, the opening / closing cover, and the housing for the optical scanning unit. When the opening / closing cover is closed, it abuts on the housing and one of the opening / closing covers to elastically deform and allow the light beam to pass therethrough, and when the opening / closing cover is opened, elastically returns to its original position and blocks the light beam. Configuration. For this reason, the shutter is formed integrally with one of the housing, the opening / closing cover, and the housing for the optical scanning unit, so that a separate light-shielding part is not required, so that the number of parts and the number of assembling steps can be reduced and the cost can be reduced. . Also, according to the present invention, the shutter passes and blocks the light beam between the light source and the light deflector, so that the scan-deflected light beam is changed according to the width of the main scanning range. The shutter can have a more compact configuration than a configuration in which light is shielded by a shutter having a different size.
【図１】本考案の第１実施例による遮光構造を採用した
レーザプリンタの概略構成を示す要部截断斜視図であ
る。FIG. 1 is a cutaway perspective view of a main part showing a schematic configuration of a laser printer employing a light shielding structure according to a first embodiment of the present invention.
【図２】図１のレーザプリンタの斜視図である。FIG. 2 is a perspective view of the laser printer of FIG.
【図３】図１のレーザプリンタに設けられる光走査ユニ
ットの概略構成を示す分解斜視図である。FIG. 3 is an exploded perspective view showing a schematic configuration of an optical scanning unit provided in the laser printer of FIG.
【図４】レーザプリンタの開閉カバーを開けた状態にお
ける本考案の第１実施例の遮光構造を示す要部斜視図で
ある。FIG. 4 is a perspective view of a main part of the light shielding structure of the first embodiment of the present invention in a state where an opening / closing cover of the laser printer is opened.
【図５】レーザプリンタの開閉カバーを閉じた状態にお
ける本考案の第１実施例の遮光構造を示す要部斜視図で
ある。FIG. 5 is a perspective view showing a main part of the light shielding structure of the first embodiment of the present invention in a state where an opening / closing cover of the laser printer is closed.
【図６】レーザプリンタの開閉カバーを開けた状態にお
ける図４の遮光構造の脚体と突起との位置関係を示す説
明図である。6 is an explanatory diagram showing a positional relationship between a leg and a projection of the light shielding structure of FIG. 4 in a state where an opening / closing cover of the laser printer is opened.
【図７】レーザプリンタの開閉カバーを閉じ始めた状態
における図４の遮光構造の脚体と突起との位置関係を示
す説明図である。FIG. 7 is an explanatory diagram showing a positional relationship between a leg and a projection of the light shielding structure in FIG. 4 in a state where the opening / closing cover of the laser printer has begun to close.
【図８】レーザプリンタの開閉カバーを閉じた状態にお
ける図４の遮光構造の脚体と突起との位置関係を示す説
明図である。8 is an explanatory diagram showing a positional relationship between a leg and a projection of the light shielding structure in FIG. 4 in a state where an opening / closing cover of the laser printer is closed.
【図９】レーザプリンタの開閉カバーを開けた状態にお
ける本考案の第２実施例の遮光構造を示す要部斜視図で
ある。FIG. 9 is a perspective view showing a main part of the light shielding structure of the second embodiment of the present invention in a state where an opening / closing cover of the laser printer is opened.
【図１０】レーザプリンタの開閉カバーを閉じた状態に
おける本考案の第２実施例の遮光構造を示す要部斜視図
である。FIG. 10 is a perspective view showing a main part of the light shielding structure of the second embodiment of the present invention in a state where an opening / closing cover of the laser printer is closed.
【図１１】レーザプリンタの開閉カバーを開けた状態に
おける本考案の第３実施例の遮光構造を示す要部斜視図
である。FIG. 11 is a perspective view of a principal part showing a light shielding structure of a third embodiment of the present invention in a state where an opening / closing cover of the laser printer is opened.
【図１２】レーザプリンタの開閉カバーを閉じた状態に
おける本考案の第３実施例の遮光構造を示す要部斜視図
である。FIG. 12 is a perspective view of a main part of a light shielding structure of a third embodiment of the present invention in a state where an opening / closing cover of the laser printer is closed.
１０ レーザプリンタ（光学走査装置） ２０ ハウジング ３０ 開閉カバー １００ 光走査ユニット １１０ ユニット用ハウジング（光走査ユニット用ハウ
ジング） １１４ 弾性部（シャッタ） １１５，１１７，１１８ 遮光部（シャッタ） １１６ 脚体（シャッタ） Ｂ１ 光ビーム Ｂ２ 走査光ビーム（光ビーム）Reference Signs List 10 laser printer (optical scanning device) 20 housing 30 opening / closing cover 100 optical scanning unit 110 unit housing (optical scanning unit housing) 114 elastic part (shutter) 115, 117, 118 light shielding part (shutter) 116 leg (shutter) B1 light beam B2 scanning light beam (light beam)
Claims (2)
偏向された光ビームを走査対象に向けて出射する光走査
ユニットと、 前記光走査ユニットを収容し、前記ハウジング及び開閉
カバーの一つに取着された光走査ユニット用ハウジング
と、 前記ハウジング、開閉カバー、及び光走査ユニット用ハ
ウジングの一つに設けられたシャッタを備え、 前記シャッタは、前記ハウジング、開閉カバー、及び光
走査ユニット用ハウジングの一つの、開閉カバーの開閉
方向を横切る平面に形成された切り欠きにより縁取られ
て、該ハウジング、開閉カバー、及び光走査ユニット用
ハウジングの一つに一体に形成され、 前記シャッタは、 前記開閉カバーを閉じた時に前記ハウ
ジング及び開閉カバーの一つに当接して弾性変形し光ビ
ームを通過させ、前記開閉カバーを開けた時に元位置に
弾性復帰し光ビームを遮光するように構成されている、 ことを特徴とする光学走査装置の光ビーム遮光構造。1. A housing, an opening / closing cover attached to the housing so as to be openable and closable, and a light beam from a light source is scanned and deflected by an optical deflector, and the scanned and deflected light beam is directed toward an object to be scanned. An optical scanning unit that emits light; a housing for the optical scanning unit that houses the optical scanning unit and is attached to one of the housing and the open / close cover; and one of the housing, the open / close cover, and the optical scan unit housing comprising a provided et the shutter, the shutter, the housing, cover, and optical
Opening and closing of the open / close cover, one of the scanning unit housings
Bounded by a notch formed in a plane crossing the direction
For the housing, opening and closing cover, and optical scanning unit
The shutter is formed integrally with one of the housings, and the shutter abuts on the housing and one of the open / close covers when the open / close cover is closed to elastically deform and allow a light beam to pass therethrough. A light beam shielding structure of an optical scanning device, wherein the light beam shielding structure is configured to elastically return to a position and shield a light beam.
の間において前記光ビームを通過、遮光する請求項１記
載の光学走査装置の光ビーム遮光構造。2. The light beam shielding structure of the optical scanning device according to claim 1, wherein the shutter passes and shields the light beam between the light source and an optical deflector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992024475U JP2587956Y2 (en) | 1992-03-24 | 1992-03-24 | Light beam shielding structure of optical scanning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992024475U JP2587956Y2 (en) | 1992-03-24 | 1992-03-24 | Light beam shielding structure of optical scanning device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0579524U JPH0579524U (en) | 1993-10-29 |
| JP2587956Y2 true JP2587956Y2 (en) | 1998-12-24 |
Family
ID=12139199
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992024475U Expired - Fee Related JP2587956Y2 (en) | 1992-03-24 | 1992-03-24 | Light beam shielding structure of optical scanning device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2587956Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100449088B1 (en) * | 2002-07-12 | 2004-09-18 | 삼성전자주식회사 | laser beam isolation apparatus and image forming apparatus having the same |
| JP5136601B2 (en) * | 2010-06-24 | 2013-02-06 | ブラザー工業株式会社 | Tandem drum unit |
| JP5153854B2 (en) * | 2010-11-15 | 2013-02-27 | シャープ株式会社 | Image forming apparatus |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0657462B2 (en) * | 1986-07-16 | 1994-08-03 | 東京電気株式会社 | Electrophotographic device |
| JPH0725773Y2 (en) * | 1988-10-28 | 1995-06-07 | 旭光学工業株式会社 | Laser shutter mechanism |
-
1992
- 1992-03-24 JP JP1992024475U patent/JP2587956Y2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0579524U (en) | 1993-10-29 |
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