JPH11249049A - Optical scanning device - Google Patents
Optical scanning deviceInfo
- Publication number
- JPH11249049A JPH11249049A JP4732098A JP4732098A JPH11249049A JP H11249049 A JPH11249049 A JP H11249049A JP 4732098 A JP4732098 A JP 4732098A JP 4732098 A JP4732098 A JP 4732098A JP H11249049 A JPH11249049 A JP H11249049A
- Authority
- JP
- Japan
- Prior art keywords
- scanning device
- optical scanning
- photosensitive body
- photoconductor
- distance
- 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.)
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- Mechanical Optical Scanning Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、レーザービ−ムプ
リンタ、コピ−装置等に使用される電子写真装置に関す
るものであり、特に感光体と光走査装置の位置決めに関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic apparatus used for a laser beam printer, a copying apparatus, and the like, and more particularly, to the positioning of a photosensitive member and an optical scanning device.
【０００２】[0002]
【従来の技術】図２に、従来の電子写真装置の感光体の
保持方法の一例を示す。モ−タ１によりベルト２が駆動
され、プ−リ３を回転させ、シャフト１０が回転する。
感光体５はホイ−ル６に取り付けてあり、シャフト１０
が回転することにより、ホイ−ル６が回転し、感光体５
が回転するというものである。感光体５には、固定され
た光走査装置７からでた走査光８が照射され、感光体５
上に潜像を作る。 このような構成であるため、感光ド
ラムに偏心があると、偏心がそのまま光走査装置との位
置ずれとなってしまった。2. Description of the Related Art FIG. 2 shows an example of a conventional method for holding a photosensitive member of an electrophotographic apparatus. The belt 2 is driven by the motor 1 to rotate the pulley 3 and the shaft 10 rotates.
The photoreceptor 5 is mounted on a wheel 6 and has a shaft 10
Is rotated, the wheel 6 is rotated, and the photosensitive member 5 is rotated.
Rotates. The photosensitive member 5 is irradiated with scanning light 8 from a fixed optical scanning device 7,
Make a latent image on top. With such a configuration, if the photosensitive drum is eccentric, the eccentricity directly results in a positional deviation from the optical scanning device.
【０００３】高速の電子写真装置では、感光体５のメン
テナンス周期をできるだけ長くしたいため、大径の感光
ドラムが用いられており、感光ドラムの偏心量もそれに
ともなって大きくなっていた。In a high-speed electrophotographic apparatus, a large-diameter photosensitive drum is used in order to make the maintenance cycle of the photosensitive member 5 as long as possible, and the eccentric amount of the photosensitive drum has been increased accordingly.
【０００４】[0004]
【発明が解決しようとする課題】上記の感光体の偏心
は、電子写真装置の印刷ドット密度が大きいすなわち走
査光のスポット径が小さくなってくるにつれ問題になっ
てくる。これについて以下に詳しく説明する。The above-described eccentricity of the photosensitive member becomes a problem as the printing dot density of the electrophotographic apparatus increases, that is, as the spot diameter of the scanning light decreases. This will be described in detail below.
【０００５】一例として、直径２５０ミリメ−トルの感
光ドラムを用いた場合について計算してみる。As an example, calculation will be made for a case where a photosensitive drum having a diameter of 250 mm is used.
【０００６】一般に感光ドラムは熱処理を行なっている
ので±１％程度の偏心が発生する。直径２５０ミリメ−
トルであれば±２．５ミリメ−トルの偏心が発生する。
これをホイ−ルにいれて矯正しても、±１ミリメ−トル
程度の感光ドラムの偏心が残ってしまう。つまり、光走
査装置からの走査光の結像位置が±１ミリメ−トル程度
変化してしまうことを意味する。Generally, the photosensitive drum is subjected to heat treatment, so that eccentricity of about ± 1% occurs. 250 mm diameter
In the case of Torr, eccentricity of ± 2.5 mm occurs.
Even if this is put in a wheel and corrected, the eccentricity of the photosensitive drum of about ± 1 mm remains. In other words, this means that the image forming position of the scanning light from the optical scanning device changes by about ± 1 mm.
【０００７】ここで、結像スポット径と結像面がずれた
ときのスポット径の関係を計算すると図３のようにな
る。図３では４８８ナノメ−トルの光を用いて、結像位
置でスポット径が１５０μｍになる場合と、３０μｍに
なる場合、結像位置が変化するとスポット径がどうなる
かを計算している。Here, the relationship between the image spot diameter and the spot diameter when the image plane shifts is calculated as shown in FIG. In FIG. 3, when the spot diameter becomes 150 μm and 30 μm at the image forming position, what happens to the spot diameter when the image forming position changes is calculated using 488 nm light.
【０００８】一般に２４０ｄｐｉの電子写真装置の場
合、１ドットが１０６μｍであるので、スポット径はそ
の√２倍の１５０μｍ程度で用いられている。図３か
ら、この場合１ミリメ−トル結像面がずれると約１５３
μｍになることがわかる。これは２％程度の変化である
ので実用上は問題無い程度であった。In general, in the case of an electrophotographic apparatus of 240 dpi, since one dot is 106 μm, the spot diameter is used at about 150 μm, which is √2 times the size. From FIG. 3, it can be seen that in this case, when the image plane is shifted by 1 mm, about 153
It can be seen that it becomes μm. Since this is a change of about 2%, there was no problem in practical use.
【０００９】つまり、２４０ｄｐｉ程度の低解像度の電
子写真装置では１ミリメ−トル程度の結像面ずれは問題
になっていなかった。That is, in an electrophotographic apparatus having a low resolution of about 240 dpi, an image plane shift of about 1 mm has not been a problem.
【００１０】しかし、近年印刷ドット密度が高まり、例
えば１２００ｄｐｉになった場合、スポット径は、１ド
ットの√２倍の３０μｍ程度に絞り込む必要がある。こ
の場合図３のように、結像面が１ミリメ−トルずれると
７８μｍにまで大きくなってしまう。これでは１２００
ｄｐｉの高解像度の印刷を行なえないので問題になって
いる。However, in recent years, when the print dot density has been increased to, for example, 1200 dpi, it is necessary to narrow the spot diameter to about 30 μm, which is √2 times 1 dot. In this case, as shown in FIG. 3, if the image forming plane is shifted by 1 mm, it becomes as large as 78 μm. This is 1200
This is problematic because high resolution printing of dpi cannot be performed.
【００１１】つまり、この例で示したとおり図２の構成
では、感光体の偏心の影響により、結像面の位置がかわ
ることで、結像スポット径が変化してしまい問題となっ
ており、これを解決することが高印刷ドット密度のため
に必要な課題であった。That is, as shown in this example, in the configuration shown in FIG. 2, the position of the image plane changes due to the influence of the eccentricity of the photoconductor, and the diameter of the image spot changes, which is a problem. Resolving this was a necessary issue for high print dot density.
【００１２】[0012]
【課題を解決するための手段】上記問題を解決するため
本発明では、光走査装置とこの光走査装置から出射した
光を感光体上に露光し、感光体上に潜像を形成する電子
写真装置において、該光走査装置を移動可能に保持し
て、光走査装置上の所定の個所と感光体表面上の光を照
射する位置との距離を常に一定の誤差範囲内に保つよう
にしている。その所定の位置は、光の出射窓である。ま
た、光走査装置の位置決め手段としては、ロ−ラ−等の
回転可能な部材を感光体と光走査装置の、所定の個所に
接触させて配置すればよい。またその他、感光体の形状
を測定するセンサを有し、このセンサの出力に応じて光
走査装置の位置を駆動する駆動装置によって、感光体と
光走査装置の距離を一定にするようにしてもよい。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an optical scanning device and an electrophotographic apparatus that exposes a light emitted from the optical scanning device onto a photoreceptor to form a latent image on the photoreceptor. In the apparatus, the optical scanning device is movably held so that a distance between a predetermined position on the optical scanning device and a position on the photoconductor surface where light is irradiated is always kept within a certain error range. . The predetermined position is a light exit window. Further, as a positioning means of the optical scanning device, a rotatable member such as a roller may be disposed in contact with a predetermined portion of the photoconductor and the optical scanning device. In addition, the distance between the photoconductor and the optical scanning device may be made constant by a driving device that has a sensor that measures the shape of the photoconductor and drives the position of the optical scanning device according to the output of the sensor. Good.
【００１３】[0013]
【発明の実施の形態】本発明の第１の実施例の全体図を
図１に示す。モ−タ１によりベルト２が駆動され、プ−
リ３を回転させ、シャフト１０が回転する。感光体５は
ホイ−ル６に取り付けてあり、シャフト１０が回転する
ことにより、ホイ−ル６が回転し、感光体５が回転する
というものである。一方、光走査装置７はシャフト９を
中心として回転可能なように配置されている。また、光
走査装置７には位置決めロ−ラ１１によって感光体５の
表面と接触し、感光体５の表面と光走査装置７の距離が
常に一定になるようにしている。FIG. 1 is an overall view of a first embodiment of the present invention. The belt 2 is driven by the motor 1,
By rotating the shaft 3, the shaft 10 rotates. The photoreceptor 5 is attached to a wheel 6, and when the shaft 10 rotates, the wheel 6 rotates and the photoreceptor 5 rotates. On the other hand, the optical scanning device 7 is arranged so as to be rotatable around the shaft 9. The optical scanning device 7 is brought into contact with the surface of the photoconductor 5 by a positioning roller 11 so that the distance between the surface of the photoconductor 5 and the optical scanning device 7 is always constant.
【００１４】位置決めロ−ラ１１は、光走査装置７本体
の重力あるいはバネ等の外部からの力によって、感光体
５の表面に押しつけているので感光体５の形状が変化し
ても感光体５と光走査装置７の距離を精度良く一定にで
きる。なお、位置決めロ−ラ１１の位置と、走査光８お
よび１２の感光体５上の長手方向の位置は概略一定にし
ておけばより正確に感光体５と光走査装置７の距離を保
つことができる。The positioning roller 11 is pressed against the surface of the photosensitive member 5 by gravity of the optical scanning device 7 or an external force such as a spring. And the distance between the optical scanning device 7 and the optical scanning device 7 can be made constant with high accuracy. If the position of the positioning roller 11 and the position of the scanning lights 8 and 12 in the longitudinal direction on the photosensitive member 5 are kept substantially constant, the distance between the photosensitive member 5 and the optical scanning device 7 can be more accurately maintained. it can.
【００１５】位置決めロ−ラ１１は感光体５に比べ小径
であり熱処理も行なわないので、加工精度を高くでき
る。そのため偏心量は±０．０５ミリメ−トル程度の精
度で実現することは容易である。よって、感光体５表面
と光走査装置７の距離を±０．０５ミリメ−トル程度の
範囲にすることは容易である。The positioning roller 11 has a smaller diameter than the photosensitive member 5 and does not perform heat treatment, so that the processing accuracy can be increased. Therefore, it is easy to realize the eccentricity with an accuracy of about ± 0.05 millimeter. Therefore, it is easy to make the distance between the surface of the photosensitive member 5 and the optical scanning device 7 within a range of about ± 0.05 mm.
【００１６】例えば、結像点で３０マイクロメ−トルに
絞ろうとする場合、０．０５ミリメ−トルの結像点ずれ
により、スポット径は約３３マイクロメ−トルに拡大す
る。しかし、１０％程度のスポット径の増大であれば、
印刷品質に与える影響は小さく、従来の場合のように３
０マイクロメ−トルに絞ろうとする場合に、結像位置が
１ミリメ−トルずれて、７８マイクロメ−トルになって
しまう場合と比べると、充分な効果がある。For example, when trying to stop down to 30 micrometers at the image forming point, the spot diameter increases to about 33 micrometers due to a shift of the image forming point of 0.05 millimeter. However, if the spot diameter increases by about 10%,
The effect on print quality is small, as in the conventional case.
When trying to stop down to 0 micrometer, there is a sufficient effect as compared with the case where the imaging position is shifted by 1 millimeter and becomes 78 micrometer.
【００１７】なお、この光走査装置７の中は図７の様に
なっており、少なくとも光源１５、回転多面鏡１６、Ｆ
θレンズ１７、リタ−ンミラ１８からなっており、光は
矢印８のように向かって走査される。The inside of the optical scanning device 7 is as shown in FIG. 7, and at least the light source 15, the rotary polygon mirror 16,
The lens comprises a θ lens 17 and a return mirror 18, and the light is scanned in the direction of arrow 8.
【００１８】本発明の注意点について以下に説明する。
図９は第１の実施例を基準とし、走査光８および１２の
位置を変えた場合の様子を示した図である。すなわち、
走査光８および１２が位置決めロ−ラ１１からずれた場
合である。この場合の詳細な図を図１０に示す。図１０
では、リタ−ンミラ１８から出た走査光８及び１４が感
光体５に照射される様子を示したものである。８のとき
は第１の実施例の場合のように位置決めロ−ラ１１のと
ころに走査光８を照射しているが、走査光１４のとき
は、図９のように位置決めロ−ラ１１から離れたところ
を照射している。第１の実施例に示すような場合は、光
走査装置７が上下に移動しても、走査光の位置が変化し
ないので問題無い。しかし、図９に示したような場合
は、光走査装置７が上下に移動すると、走査位置も変化
してしまい問題になる。例えば、図１１の様に光走査装
置７の移動量をＬ、位置決めロ−ラ１１との接点位置か
らの法線と走査光線とのなす角をθ、走査位置ずれをＸ
とすると、Ｘ＝Ｌtanθと表せる。例えば、Ｌ＝１ミリ
メ−トル、θ＝１０度、とすればＸ＝１７０マイクロメ
−トルとなり。高精細な印刷を行なう場合問題となって
くる。このためθは０に近い値とするのがよい。The precautions of the present invention will be described below.
FIG. 9 is a diagram showing a state where the positions of the scanning lights 8 and 12 are changed based on the first embodiment. That is,
This is the case where the scanning lights 8 and 12 are displaced from the positioning roller 11. A detailed diagram in this case is shown in FIG. FIG.
FIG. 5 shows a state in which the scanning light 8 and 14 emitted from the return mirror 18 are irradiated on the photosensitive member 5. In the case of 8, the scanning light 8 is irradiated to the positioning roller 11 as in the first embodiment, but in the case of the scanning light 14, the positioning roller 11 is irradiated from the positioning roller 11 as shown in FIG. It irradiates far away. In the case shown in the first embodiment, even if the optical scanning device 7 moves up and down, there is no problem because the position of the scanning light does not change. However, in the case as shown in FIG. 9, when the optical scanning device 7 moves up and down, the scanning position also changes, which causes a problem. For example, as shown in FIG. 11, the amount of movement of the optical scanning device 7 is L, the angle between the normal line from the contact point with the positioning roller 11 and the scanning light beam is θ, and the displacement of the scanning position is X.
Then, X = Ltanθ can be expressed. For example, if L = 1 millimeter and θ = 10 degrees, then X = 170 micrometers. A problem arises when performing high-definition printing. Therefore, θ is preferably set to a value close to 0.
【００１９】本発明の第２の実施例を図４に示す。この
場合も第１の実施例に示した場合と同様な動きをする。
光走査装置７には、位置決めロ−ラ１１が一体に付いて
おり、光走査装置７の重力あるいはバネ等の外部からの
力によって、光走査装置７を感光体５の表面に押しつけ
ているので感光体５の形状が変化しても感光体５と光走
査装置７の距離を精度良く一定にできる。よって、結像
位置ずれの無い、微小なスポットの走査が可能となる。FIG. 4 shows a second embodiment of the present invention. In this case, the same operation as in the first embodiment is performed.
The optical scanning device 7 is integrally provided with a positioning roller 11, and the optical scanning device 7 is pressed against the surface of the photosensitive member 5 by the external force such as gravity of the optical scanning device 7 or a spring. Even if the shape of the photoconductor 5 changes, the distance between the photoconductor 5 and the optical scanning device 7 can be made constant with high accuracy. Therefore, it is possible to scan a minute spot without any displacement of the imaging position.
【００２０】本発明の第３の実施例を図５に示す。この
場合も第１の実施例に示した場合と同様な動きをする。
光走査装置７には、位置決めロ−ラ１１とベ−ス４に固
定したバネ１３が付いている。光走査装置７はバネの力
によって、感光体５の表面に押しつけているので感光体
５の形状が変化しても感光体５と光走査装置７の距離を
精度良く一定にできる。よって、結像位置ずれの無い、
微小なスポットの走査が可能となる。FIG. 5 shows a third embodiment of the present invention. In this case, the same operation as in the first embodiment is performed.
The optical scanning device 7 has a positioning roller 11 and a spring 13 fixed to the base 4. Since the optical scanning device 7 is pressed against the surface of the photoconductor 5 by the force of a spring, the distance between the photoconductor 5 and the optical scanning device 7 can be accurately kept constant even if the shape of the photoconductor 5 changes. Therefore, there is no imaging position shift,
It is possible to scan a minute spot.
【００２１】本発明の第４の実施例を図６に示す。この
場合は第２の実施例に示した場合と同様な動きをする。
光走査装置７には、位置決めロ−ラ１１とベ−ス４に固
定したバネ１３が付いている。光走査装置７はバネの力
によって、感光体５の表面に押しつけているので感光体
５の形状が変化しても感光体５と光走査装置７の距離を
精度良く一定にできる。よって、結像位置ずれの無い、
微小なスポットの走査が可能となる。FIG. 6 shows a fourth embodiment of the present invention. In this case, the same operation as in the case of the second embodiment is performed.
The optical scanning device 7 has a positioning roller 11 and a spring 13 fixed to the base 4. Since the optical scanning device 7 is pressed against the surface of the photoconductor 5 by the force of a spring, the distance between the photoconductor 5 and the optical scanning device 7 can be accurately kept constant even if the shape of the photoconductor 5 changes. Therefore, there is no imaging position shift,
It is possible to scan a minute spot.
【００２２】本発明の第５の実施例を図１２に示す。こ
の場合は感光体５の表面の出入り量をセンサ２０にて検
知し、その距離と同じ量を光走査装置７が動くように、
モ−タ２２と偏心カム２１からなる微動装置を動かして
いる。センサ２０は接触式でも非接触式でも良い。ま
た、光走査装置７を動かす微動装置も偏心カムを用いる
手段に限らない。FIG. 12 shows a fifth embodiment of the present invention. In this case, the sensor 20 detects the amount of ingress and egress of the surface of the photoreceptor 5 and moves the optical scanning device 7 by the same amount as the distance.
A fine movement device consisting of a motor 22 and an eccentric cam 21 is operated. The sensor 20 may be a contact type or a non-contact type. Further, the fine movement device for moving the optical scanning device 7 is not limited to the means using the eccentric cam.
【００２３】[0023]
【発明の効果】以上の様に本発明によれば、大径の感光
ドラムを用いる高速タイプの電子写真装置の感光ドラム
に、偏心があっても、光走査装置と感光体の距離を所定
の値に精度良く配置できる。よって、走査光の結像面の
位置ずれを小さくでき、微小なスポット径を実現でき、
高速で印刷可能でかつ高印刷ドット密度の電子写真装置
を実現できる。As described above, according to the present invention, even if the photosensitive drum of a high-speed type electrophotographic apparatus using a large-diameter photosensitive drum is eccentric, the distance between the optical scanning device and the photosensitive member is kept at a predetermined value. Values can be placed with high accuracy. Therefore, it is possible to reduce the positional deviation of the image plane of the scanning light, and realize a small spot diameter,
An electrophotographic apparatus which can print at high speed and has a high print dot density can be realized.
【図１】 本発明の第１の実施例である。FIG. 1 is a first embodiment of the present invention.
【図２】 本発明の従来例を説明する図である。FIG. 2 is a diagram illustrating a conventional example of the present invention.
【図３】 スポット径と結像位置ずれの関係を計算した
結果である。FIG. 3 shows a result of calculating a relationship between a spot diameter and an imaging position shift.
【図４】 本発明の第２の実施例である。FIG. 4 is a second embodiment of the present invention.
【図５】 本発明の第３の実施例である。FIG. 5 is a third embodiment of the present invention.
【図６】 本発明の第４の実施例である。FIG. 6 is a fourth embodiment of the present invention.
【図７】 本発明の実施例の説明図である。FIG. 7 is an explanatory diagram of an embodiment of the present invention.
【図８】 本発明の実施例の説明図である。FIG. 8 is an explanatory diagram of an embodiment of the present invention.
【図９】 本発明の説明図である。FIG. 9 is an explanatory diagram of the present invention.
【図１０】 本発明の説明図である。FIG. 10 is an explanatory diagram of the present invention.
【図１１】 本発明の説明図である。FIG. 11 is an explanatory diagram of the present invention.
【図１２】 本発明の第５の実施例である。FIG. 12 is a fifth embodiment of the present invention.
１はモ−タ、２はベルト、３はプ−リ、４はベ−ス、５
は感光体、６はホイ−ル、７は光走査装置、８は走査
光、９、１０はシャフト、１１は位置決めロ−ラ、１２
は走査光、１３はバネ、１４は走査光、１５は光源、１
６は回転多面鏡、１７はＦθレンズ、１８はリタ−ンミ
ラ、２０はセンサ、２１は偏心カム、２２はモ−タを示
す。1 is a motor, 2 is a belt, 3 is a pulley, 4 is a base, 5
Is a photoreceptor, 6 is a wheel, 7 is an optical scanning device, 8 is scanning light, 9 and 10 are shafts, 11 is a positioning roller, 12
Is scanning light, 13 is spring, 14 is scanning light, 15 is light source, 1
6 is a rotary polygon mirror, 17 is an F.theta. Lens, 18 is a return mirror, 20 is a sensor, 21 is an eccentric cam, and 22 is a motor.
Claims (4)
露光し、感光体上に潜像を形成する電子写真装置におい
て、該光走査装置を感光体に対し相対的に移動可能に保
持し、光走査装置上の所定の個所と感光体表面上との距
離を、常に一定に保つ位置決め手段を光走査装置と感光
体の間に設けたことを特徴とする光走査装置。1. An electrophotographic apparatus that forms a latent image on a photoconductor by exposing light emitted from an optical scanning device onto a photoconductor, and holds the optical scanning device movably relative to the photoconductor. An optical scanning device characterized in that a positioning means for keeping the distance between a predetermined position on the optical scanning device and the surface of the photoconductor constant at all times is provided between the optical scanning device and the photoconductor.
であることを特徴とする請求項１記載の光走査装置。2. The optical scanning device according to claim 1, wherein a predetermined portion on the optical scanning device is a light exit window.
ラ−等の回転可能な部材を感光体と光走査装置の、所定
の個所に接触させて配置したことを特徴とする請求項１
記載の光走査装置。3. A method as a positioning means for an optical scanning device, comprising:
2. A photoreceptor and an optical scanning device, wherein a rotatable member such as a liner is arranged in contact with a predetermined portion of the optical scanning device.
The optical scanning device according to claim 1.
センサの出力に応じて光走査装置の位置を移動する駆動
装置を光走査装置に設け、感光体と光走査装置の距離を
一定に保持することを特徴とする請求項１記載の光走査
装置。4. A sensor for measuring a shape of a photoreceptor is provided,
2. The optical scanning device according to claim 1, wherein a driving device that moves a position of the optical scanning device according to an output of the sensor is provided in the optical scanning device, and a distance between the photoconductor and the optical scanning device is kept constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4732098A JPH11249049A (en) | 1998-02-27 | 1998-02-27 | Optical scanning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4732098A JPH11249049A (en) | 1998-02-27 | 1998-02-27 | Optical scanning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11249049A true JPH11249049A (en) | 1999-09-17 |
Family
ID=12771994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4732098A Pending JPH11249049A (en) | 1998-02-27 | 1998-02-27 | Optical scanning device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11249049A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6801232B2 (en) * | 2001-04-06 | 2004-10-05 | Oki Data Corporation | Distance maintaining member between optical head and image drum |
| JP2008134644A (en) * | 2001-04-06 | 2008-06-12 | Oki Data Corp | Positioning device for optical head, positioning device for led head, and printer |
-
1998
- 1998-02-27 JP JP4732098A patent/JPH11249049A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6801232B2 (en) * | 2001-04-06 | 2004-10-05 | Oki Data Corporation | Distance maintaining member between optical head and image drum |
| JP2008134644A (en) * | 2001-04-06 | 2008-06-12 | Oki Data Corp | Positioning device for optical head, positioning device for led head, and printer |
| JP4704415B2 (en) * | 2001-04-06 | 2011-06-15 | 株式会社沖データ | Optical head positioning device, LED head positioning device, and printing device |
| JP2011145684A (en) * | 2001-04-06 | 2011-07-28 | Oki Data Corp | Positioning device for optical head |
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