JPH05232598A - Exposure device for image forming device - Google Patents
Exposure device for image forming deviceInfo
- Publication number
- JPH05232598A JPH05232598A JP3901792A JP3901792A JPH05232598A JP H05232598 A JPH05232598 A JP H05232598A JP 3901792 A JP3901792 A JP 3901792A JP 3901792 A JP3901792 A JP 3901792A JP H05232598 A JPH05232598 A JP H05232598A
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- irradiation surface
- light sources
- original
- 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.)
- Pending
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- Exposure Or Original Feeding In Electrophotography (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、画像形成装置の露光装
置に関し、特に光源からの光を効率よく原稿照射面に照
射させる光源ユニツトの構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposure device for an image forming apparatus, and more particularly to a structure of a light source unit for efficiently irradiating light from a light source onto a document irradiation surface.
【０００２】[0002]
【従来の技術】従来の画像形成装置の露光装置として、
図５，６の如く、基板１上に、原稿照射面を照射するた
めの複数個のヒユーズ型光源２が配列されたものがあ
る。2. Description of the Related Art As an exposure apparatus of a conventional image forming apparatus,
As shown in FIGS. 5 and 6, there is a substrate 1 on which a plurality of fuse-type light sources 2 for irradiating an original irradiation surface are arranged.
【０００３】ここで、各光源２は、原稿照射面への光量
を増すよう、基板１の長手方向に対して斜めに配置され
たものが一般的であつた。また、各光源２の基板１の平
面に対する高さは均一とされていた。Here, each light source 2 is generally arranged obliquely with respect to the longitudinal direction of the substrate 1 so as to increase the amount of light to the document irradiation surface. Further, the height of each light source 2 with respect to the plane of the substrate 1 is uniform.
【０００４】[0004]
【発明が解決しようとする課題】従来方式では、配光分
布で両端部の明るさが低くなり、したがつて、必要な明
るさの範囲内に入る有効巾ＲＡが狭くなる。これを広く
するためには、 （１）光源２の数を増して光量を増す、（２）両サイド
の光源２として、輝度特性の高い別種類のランプを取り
付ける、等が考えられるが、（１）はコストが上昇する
とともに、構造が大きくなり、装置の小型化の要請に反
する。また、（２）は、別種類の光源２を使用するた
め、組立作業やメンテナンス作業における部品管理が繁
雑となるだけでなく、ＴＴＬ消費電力が増大する。した
がつて、（１）（２）のいずれも好ましくない。In the conventional method, the brightness at both ends of the light distribution is low, and therefore the effective width RA within the required brightness range is narrow. In order to widen this, it is considered that (1) the number of light sources 2 is increased to increase the amount of light, (2) different types of lamps having high brightness characteristics are attached as the light sources 2 on both sides, In 1), the cost increases and the structure becomes large, which is against the demand for downsizing of the device. Further, in (2), since the light source 2 of another type is used, not only the parts management in the assembly work and the maintenance work becomes complicated but also the TTL power consumption increases. Therefore, neither (1) nor (2) is preferable.
【０００５】本発明は、上記課題に鑑み、両端部の配光
分布を明るくできる画像形成装置の露光装置の提供を目
的とする。In view of the above problems, it is an object of the present invention to provide an exposure device of an image forming apparatus that can brighten the light distribution distribution at both ends.
【０００６】[0006]
【課題を解決するための手段】本発明請求項１による課
題解決手段は、図１，２の如く、基板１０上に、原稿照
射面１６を照射するための複数個の光源１１が配列され
た画像形成装置の露光装置において、前記基板１０の端
部に配された光源１１は、他の光源１１より原稿照射面
１６に近接配置されたものである。As shown in FIGS. 1 and 2, a plurality of light sources 11 for illuminating a document illuminating surface 16 are arranged on a substrate 10 as shown in FIGS. In the exposure apparatus of the image forming apparatus, the light source 11 arranged at the end of the substrate 10 is arranged closer to the original irradiation surface 16 than the other light sources 11.
【０００７】本発明請求項２による課題解決手段は、基
板１０上に、原稿照射面１６を照射するための複数個の
光源１１が配列された画像形成装置の露光装置におい
て、前記各光源１１は、基板１０の長手方向に対して斜
めに配置され、該光源１１のうち基板１０の端部に配さ
れた光源１１の外側端部は、内側端部より原稿照射面１
６に近接配置されたものである。According to a second aspect of the present invention, there is provided an exposure device of an image forming apparatus in which a plurality of light sources 11 for illuminating a document illuminating surface 16 are arranged on a substrate 10. , The outer end of the light source 11 disposed obliquely with respect to the longitudinal direction of the substrate 10 and arranged at the end of the substrate 10 of the light source 11 has the original irradiation surface 1 from the inner end.
6 is arranged in close proximity.
【０００８】[0008]
【作用】上記請求項１，２による課題解決手段におい
て、光源１１から発せられた光を原稿照射面１６に照射
する際、基板１０上の両端部の照度は、中央部に比べ
て、光源１１と原稿照射面１６とが近接した分だけ増大
する。そうすると、両端部と中央部との光量差が緩和さ
れ、配光分布が矩形に近くなる。In the means for solving the problems according to claims 1 and 2, when the light emitted from the light source 11 is applied to the document irradiation surface 16, the illuminance at both ends on the substrate 10 is higher than that at the central part. And the document irradiation surface 16 are close to each other, the size increases. Then, the light amount difference between the both ends and the central part is relaxed, and the light distribution becomes close to a rectangle.
【０００９】[0009]
【実施例】図１は本発明の一実施例を示す露光装置の斜
視図、図２は本発明の一実施例を示す露光装置の側面
図、図３は本発明の一実施例を示す露光装置を用いた画
像形成装置の全体概略図、図４は露光装置の長手方向に
対する配光分布を示す図である。1 is a perspective view of an exposure apparatus showing an embodiment of the present invention, FIG. 2 is a side view of an exposure apparatus showing an embodiment of the present invention, and FIG. 3 is an exposure showing an embodiment of the present invention. FIG. 4 is a diagram showing an overall schematic view of an image forming apparatus using the apparatus, and FIG. 4 is a view showing a light distribution distribution in the longitudinal direction of the exposure apparatus.
【００１０】まず、本実施例の露光装置が使用される複
写機等の画像形成装置を図３に示す。該画像形成装置
は、画像形成装置本体１５の上面に、原稿照射面として
のテーブルガラス１６が移動自在に配置され、該テーブ
ルガラス１６の上面に開閉自在な原稿カバー１７が設け
られている。First, FIG. 3 shows an image forming apparatus such as a copying machine in which the exposure apparatus of this embodiment is used. In the image forming apparatus, a table glass 16 as a document irradiation surface is movably arranged on an upper surface of an image forming apparatus body 15, and an openable document cover 17 is provided on the upper surface of the table glass 16.
【００１１】前記テーブルガラス１６の下方に、前記露
光装置が配され、露光装置から斜上方のテーブルガラス
１６面が原稿照射面とされ、この原稿照射面１６の真下
に感光体１８が配されている。The exposure device is arranged below the table glass 16, the surface of the table glass 16 obliquely above the exposure device is the original irradiation surface, and the photoconductor 18 is arranged directly below the original irradiation surface 16. There is.
【００１２】なお、図３中、１９はテーブルガラス１６
で反射された光を感光体１８に導くセルフオツクレン
ズ、２０はクーリングフアン、２１はメインチヤージヤ
ー、２２はマグネツトローラ、２３は現像カートリツ
ジ、２４は給紙トレイ、２５は呼び込みローラ、２６は
ストツパー、２７は摩擦板、２８は給紙ローラ、２９は
レジストローラ、３０は転写チヤージヤー、３１は上ヒ
ートローラ、３２は下ヒートローラ、３３はヒーターラ
ンプ、３４はクリーニング装置、３５は廃棄トナーカー
トリツジである。In FIG. 3, 19 is a table glass 16
A self-locking lens for guiding the light reflected by the photosensitive member 18 to the photosensitive member 18, 20 is a cooling fan, 21 is a main charger, 22 is a magnet roller, 23 is a developing cartridge, 24 is a paper feed tray, 25 is a take-in roller, 26 Is a stopper, 27 is a friction plate, 28 is a feed roller, 29 is a registration roller, 30 is a transfer charger, 31 is an upper heat roller, 32 is a lower heat roller, 33 is a heater lamp, 34 is a cleaning device, and 35 is waste toner. It is a Cartridge.
【００１３】そして、本実施例の露光装置は、図１，２
の如く、基板１０上に、原稿照射面１６を照射するため
の複数個の光源１１が配列されたものである。The exposure apparatus according to the present embodiment is similar to that shown in FIGS.
As described above, a plurality of light sources 11 for irradiating the document irradiation surface 16 are arranged on the substrate 10.
【００１４】前記基板１０は、エポキシ樹脂またはフエ
ノール樹脂を細長い平板状に形成している。なお、該基
板１０の両端部は、光源１１からの光を原稿照射面へ反
射させるよう、傾斜させておくのが望ましい。The substrate 10 is formed of an epoxy resin or a phenol resin in the shape of an elongated flat plate. It is desirable that both ends of the substrate 10 be inclined so that the light from the light source 11 is reflected to the original irradiation surface.
【００１５】前記光源１１は、軟質ガラス製の棒状管体
１１ａの両端部からタングステン製フイラメントが装入
され、これがリード線１１ｂとして外部へ引き出された
一般的なものが使用されている。The light source 11 is a general one in which a filament made of tungsten is inserted from both ends of a rod-shaped tube body 11a made of soft glass, and the filament is drawn out to the outside as a lead wire 11b.
【００１６】該各光源１１は、原稿照射面１６への光量
（リツプル）を増すよう、基板１０の長手方向に対して
斜めに配置されている。そして、これら光源１１のう
ち、基板１０の両端側に配された光源１１の外側端部Ｐ
は、他の光源１１よりも原稿照射面１６に近接するよう
基板１０から離間して配置されている。なお、この離間
寸法ｈ１，ｈ２は、管体１１ａが軽量であるため、リー
ド線１１ｂの基板１０に対する引き出し距離を増すだけ
で、光源１１を基板１０上に充分保持できるものである
が、外部からの衝撃等を考慮すれば、専用の保持具１４
を設けるのが望ましい。そして、前記離間寸法ｈ１，ｈ
２は、保持具１４の高さを設定することで調整すればよ
い。The respective light sources 11 are arranged obliquely with respect to the longitudinal direction of the substrate 10 so as to increase the amount of light (ripple) to the document irradiation surface 16. Out of these light sources 11, the outer end portions P of the light sources 11 arranged on both end sides of the substrate 10
Are arranged apart from the substrate 10 so as to be closer to the document irradiation surface 16 than the other light sources 11. The distances h 1 and h 2 allow the light source 11 to be sufficiently held on the substrate 10 only by increasing the lead-out distance of the lead wire 11b from the substrate 10 because the tubular body 11a is lightweight. Considering the impact from the outside, the dedicated holder 14
It is desirable to provide. Then, the separation dimensions h 1 , h
2 may be adjusted by setting the height of the holder 14.
【００１７】上記構成において、原稿カバー１７を開け
て、原稿を原稿照射面１６、すなわちテーブルガラス上
に置き、スイツチをオンすると露光装置が駆動される。
すなわち、光源１１が発光し、テーブルガラス１６を照
射する。この光は原稿で反射し、セルフオツクレンズ１
９を通して感光体面で結像される。その後、マグネツト
ローラ２２からのトナーが感光体面に引きよせられる。In the above structure, the document cover 17 is opened, the document is placed on the document irradiation surface 16, that is, the table glass, and the switch is turned on to drive the exposure device.
That is, the light source 11 emits light and illuminates the table glass 16. This light is reflected by the original and the self-locking lens 1
An image is formed on the surface of the photoconductor through 9. After that, the toner from the magnet roller 22 is attracted to the surface of the photoconductor.
【００１８】このとき、光源１１としての複数個のラン
プのうち、基板１０の両端部に相当する部分を原稿照射
面１６に近接させているので、原稿照射面１６での照度
が高まり、配光分布が矩形状に近くなる。At this time, among the plurality of lamps as the light source 11, the portions corresponding to both ends of the substrate 10 are brought close to the original irradiation surface 16, so that the illuminance on the original irradiation surface 16 is increased and the light distribution is achieved. The distribution is close to rectangular.
【００１９】なお、具体的に、基板１０に密着した光源
１１より２７ｍｍ離間させた位置に光センサを配置して
測定した結果を図４に破線で示す。ここでは、平均照度
が７８００ｌｕｘでありまた、この平均照度に対して、
光センサを基板１０の長手方向にスライドさせて測定し
たリツプル巾は、±２．１％であつた。この実施例にお
いて、リツプル巾＝８％すなわち平均照度７８００ｌｕ
ｘより±４％内に入る有効巾は、従来（実線）によると
ＲＡ＝１８０ｍｍであつたが、本実施例では、ｈ１＝ｈ
２＝６ｍｍにするとＲＢ＝２１８ｍｍに拡大し、３８ｍ
ｍも拡大していることがわかる。Specifically, the result of measurement by disposing an optical sensor at a position separated by 27 mm from the light source 11 in close contact with the substrate 10 is shown by a broken line in FIG. Here, the average illuminance is 7800lux, and with respect to this average illuminance,
The ripple width measured by sliding the optical sensor in the longitudinal direction of the substrate 10 was ± 2.1%. In this embodiment, the ripple width = 8%, that is, the average illuminance is 7800 lu.
According to the prior art (solid line), the effective width within ± 4% from x was RA = 180 mm, but in this embodiment, h 1 = h
When 2 = 6 mm, it is expanded to R B = 218 mm, 38 m
It can be seen that m is also expanding.
【００２０】このように、最小限の部品点数で、しかも
画像形成装置の大型化にもならずに、均一な配光分布を
達成でき、一定のリツプルを確保できる有効巾を向上で
きる。As described above, it is possible to achieve a uniform light distribution with a minimum number of parts and without increasing the size of the image forming apparatus, and it is possible to improve the effective width in which a certain ripple can be secured.
【００２１】なお、本発明は、上記実施例に限定される
ものではなく、本発明の範囲内で上記実施例に多くの修
正および変更を加え得ることは勿論である。The present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.
【００２２】例えば、上記実施例では、光源１１を基板
１０の長手方向に対して斜めに配しているが、基板１０
の長手方向に平行に配してもよい。この場合、端部に配
された光源１１は、基板１０の表面に対して平行に離間
させればよい。For example, in the above embodiment, the light source 11 is arranged obliquely with respect to the longitudinal direction of the substrate 10.
You may arrange | position parallel to the longitudinal direction of. In this case, the light sources 11 arranged at the ends may be separated in parallel to the surface of the substrate 10.
【００２３】また、上記実施例では、端部の光源１１を
基板１０から離間させることにより原稿照射面１６に近
接させていたが、基板１０の端部自体を原稿照射面１６
側に傾斜させてもよい。Further, in the above-described embodiment, the light source 11 at the end is located close to the document irradiation surface 16 by separating it from the substrate 10, but the end itself of the substrate 10 is located at the document irradiation surface 16.
You may incline to the side.
【００２４】[0024]
【発明の効果】以上の説明から明らかな通り、本発明請
求項１，２によると、基板の端部の光源を原稿照射面に
近接配置しているので、光源の数を増大して高コストと
なつたり、輝度特性の高い別タイプの光源を用いて部品
管理を複雑にしなくても、端部の照度を充分に向上し得
る。したがつて、低コスト、小型化の要請に合致し、組
立作業やメンテナンス作業における部品管理が容易であ
りながら、広い範囲にわたつて均一な配光分布を実現で
きるといつた優れた効果がある。As is apparent from the above description, according to claims 1 and 2 of the present invention, since the light sources at the end portions of the substrate are arranged close to the document irradiation surface, the number of light sources is increased and the cost is increased. In other words, it is possible to sufficiently improve the illuminance at the end without complicating the parts management by using another type of light source having high brightness characteristics. Therefore, it meets the requirements of low cost and miniaturization, and it is very effective to achieve uniform light distribution over a wide range while facilitating parts management in assembly work and maintenance work. ..
【図１】本発明の一実施例を示す露光装置の斜視図FIG. 1 is a perspective view of an exposure apparatus showing an embodiment of the present invention.
【図２】本発明の一実施例を示す露光装置の側面図FIG. 2 is a side view of an exposure apparatus showing an embodiment of the present invention.
【図３】本発明の一実施例を示す露光装置を用いた画像
形成装置の全体概略図FIG. 3 is an overall schematic view of an image forming apparatus using an exposure apparatus showing an embodiment of the present invention.
【図４】露光装置の長手方向に対する配光分布を示す図FIG. 4 is a diagram showing a light distribution distribution in the longitudinal direction of the exposure apparatus.
【図５】従来の露光装置の側面図FIG. 5 is a side view of a conventional exposure apparatus.
【図６】従来の露光装置の斜視図FIG. 6 is a perspective view of a conventional exposure apparatus.
１０ 基板 １１ 光源 １６ 原稿照射面 10 substrate 11 light source 16 original irradiation surface
Claims (2)
複数個の光源が配列された画像形成装置の露光装置にお
いて、前記基板の端部に配された光源は、他の光源より
原稿照射面に近接配置されたことを特徴とする画像形成
装置の露光装置。1. In an exposure device of an image forming apparatus in which a plurality of light sources for illuminating a document irradiation surface are arranged on a substrate, a light source arranged at an end portion of the substrate is more original than other light sources. An exposure device for an image forming apparatus, which is arranged close to an irradiation surface.
複数個の光源が配列された画像形成装置の露光装置にお
いて、前記各光源は、基板の長手方向に対して斜めに配
置され、該光源のうち基板の端部に配された光源の外側
端部は、内側端部より原稿照射面に近接配置されたこと
を特徴とする画像形成装置の露光装置。2. An exposure device of an image forming apparatus in which a plurality of light sources for illuminating a document irradiation surface are arranged on a substrate, wherein each of the light sources is arranged obliquely with respect to a longitudinal direction of the substrate. An exposure apparatus of an image forming apparatus, wherein an outer end portion of the light source, which is disposed at an end portion of the substrate, of the light source is disposed closer to the original irradiation surface than the inner end portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3901792A JPH05232598A (en) | 1992-02-26 | 1992-02-26 | Exposure device for image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3901792A JPH05232598A (en) | 1992-02-26 | 1992-02-26 | Exposure device for image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05232598A true JPH05232598A (en) | 1993-09-10 |
Family
ID=12541342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3901792A Pending JPH05232598A (en) | 1992-02-26 | 1992-02-26 | Exposure device for image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05232598A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07168406A (en) * | 1993-12-16 | 1995-07-04 | Ricoh Co Ltd | Average illuminance measuring device |
-
1992
- 1992-02-26 JP JP3901792A patent/JPH05232598A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07168406A (en) * | 1993-12-16 | 1995-07-04 | Ricoh Co Ltd | Average illuminance measuring device |
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