JPS60260934A - Picture image forming device - Google Patents
Picture image forming deviceInfo
- Publication number
- JPS60260934A JPS60260934A JP11766084A JP11766084A JPS60260934A JP S60260934 A JPS60260934 A JP S60260934A JP 11766084 A JP11766084 A JP 11766084A JP 11766084 A JP11766084 A JP 11766084A JP S60260934 A JPS60260934 A JP S60260934A
- Authority
- JP
- Japan
- Prior art keywords
- light
- mirror
- reflecting plate
- mirrors
- image forming
- 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
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
- Projection-Type Copiers In General (AREA)
Abstract
Description
【発明の詳細な説明】
(技術分野)
本発明は原稿画像をミラーやレンズを含む光学系により
感光面に投影する画像形成装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an image forming apparatus that projects an original image onto a photosensitive surface using an optical system including mirrors and lenses.
(従来技術と問題点)
画像形成装置が冷え切った状態から、急に暖かい雰囲気
中にさらされると、ミラーやレンズに露結し、画像の質
が劣化する。(Prior Art and Problems) When an image forming apparatus is suddenly exposed to a warm atmosphere from a cold state, dew condensation forms on mirrors and lenses, deteriorating the quality of images.
従来の場合は、光学系の結露現象を防屯するために、光
学系の近傍にヒーターを配置し、夜間通電を行なって光
学系を温めるという方法がとられていた。しかし、この
方法だと、結露を生しない環境下であっても動作し、省
エネと言えない欠点と、ヒーターによる夜間通電によっ
ても結露現象を防止出来なかった場合には、画像不良が
発生してしまうという欠点を有している。Conventionally, in order to prevent dew condensation on the optical system, a heater was placed near the optical system and the optical system was heated by turning on electricity at night. However, this method works even in environments where condensation does not occur, so it cannot be said to be energy-saving.If the condensation phenomenon cannot be prevented even when the heater is turned on at night, image defects may occur. It has the disadvantage of being stored away.
(目的と構成概要) 本発明は上記従来の欠点を除去することを目的とする。(Purpose and composition overview) The present invention aims to eliminate the above-mentioned conventional drawbacks.
そして本発明ではミラー、又はレンズの近傍に、ミラー
又はレンズと略同材質反射板、及びこの反射板を介して
対向する発光素子、受光素子を配置し、受光素子の出力
を用いて前記露結が生じているか否かを検知する。In the present invention, a reflecting plate made of substantially the same material as the mirror or lens, and a light-emitting element and a light-receiving element facing each other through the reflecting plate are arranged near the mirror or lens, and the output of the light-receiving element is used to generate the dew. Detect whether or not this is occurring.
(実施例)
第1図は本発明の実施例で、lは原稿載置用プラテンカ
ラス、2は原稿照明ランプ、3は反射笠、4は第1ミラ
ー、5は第2ミラー、6は第3ミラー、7は投影レンズ
、8は第4ミラー、9は電子写真感光ドラムであり、1
0はドラム9に投影されるスリフト光を示している。(Embodiment) Fig. 1 shows an embodiment of the present invention, in which l is a platen crow for placing an original, 2 is an original illumination lamp, 3 is a reflective shade, 4 is a first mirror, 5 is a second mirror, and 6 is a second mirror. 3 is a mirror, 7 is a projection lens, 8 is a fourth mirror, 9 is an electrophotographic photosensitive drum, 1
0 indicates the thrift light projected onto the drum 9.
11はミラー5.6の近傍に配置された反射板であり、
12は発光LED、13はLEDl2から反射板11に
照射された光を受光する受光センサーである。ここで反
射板11は、ミラー5および6と同じ材質より成る反射
板であるが、その大きさは、ミラー5および6と同じく
スリット長手方向に長くなくても良く、数センチ四方程
度の大きさでかまわない。尚、11,12.13の部材
はレンズ7の近傍に配置してもよい。11 is a reflection plate placed near the mirror 5.6;
Reference numeral 12 is a light emitting LED, and reference numeral 13 is a light receiving sensor that receives light irradiated onto the reflecting plate 11 from the LED l2. Here, the reflector 11 is a reflector made of the same material as the mirrors 5 and 6, but its size does not have to be long in the longitudinal direction of the slit, like the mirrors 5 and 6, and is about several centimeters square. It doesn't matter. Note that the members 11, 12, and 13 may be placed near the lens 7.
また、本適用例では、ランプ2、反射笠3、ミラー4は
第1ミラーユニットを構成し、ミラー5.6および反射
板11.LEDl2、センサー13は第2ミラーユニッ
トを構成している。第1ミラーユニットと第2ミラーユ
ニツトは速度比2:1で同一方向に走査し、スリット画
像をドラム94二に形成するものである。Further, in this application example, the lamp 2, the reflective shade 3, and the mirror 4 constitute a first mirror unit, and the mirror 5.6 and the reflective plate 11. The LED l2 and the sensor 13 constitute a second mirror unit. The first mirror unit and the second mirror unit scan in the same direction at a speed ratio of 2:1 to form a slit image on the drum 942.
さて、本実施例において、結露現象が発生した場合は、
熱容量の大きいミラー4,5,6.8や投影レンズ7の
表面に無数の水滴が形成されるが、同時に、反射板11
の表面にも無数の水滴が形成されることになる。光学系
を形成するミラー面やレンズ面に水滴が付着した場合は
反射光あるいは透過光が散乱され、当然ドラムに達する
光量は低下し、画像不良を生じる。しかし、上記ミラー
面やレンズ面の水滴付着を検知する手段を設 11:け
るには、光学系の設計を困難にする欠点がある。本発明
は、光学系を形成するミラー等と同じ材質の反射板を光
学系近傍に設けることにより、結露現象を検知する様に
したものである。Now, in this example, if dew condensation occurs,
Countless water droplets are formed on the surfaces of the mirrors 4, 5, 6.8 and the projection lens 7, which have large heat capacities, but at the same time, the reflection plate 11
Countless water droplets will be formed on the surface. When water droplets adhere to mirror surfaces or lens surfaces that form the optical system, reflected or transmitted light is scattered, which naturally reduces the amount of light reaching the drum, resulting in poor images. However, providing a means for detecting the adhesion of water droplets on the mirror surface or lens surface has the drawback of making it difficult to design the optical system. The present invention detects dew condensation by providing a reflection plate made of the same material as the mirrors forming the optical system near the optical system.
光学系の結露現象は、夜間低温状態にさらされていた複
写装置を、朝電源ONL、定着ヒーターを動作させるこ
とによる機械の温度上昇と、複写装置が置かれている環
境の温度上昇との相乗作用により発生するものである。The condensation phenomenon in the optical system is caused by the synergistic effect of the increase in temperature of the copying machine, which was exposed to low temperatures at night, when the power is turned on in the morning and the fixing heater is turned on, and the temperature rise of the environment in which the copying machine is placed. It is caused by the action.
従って電源をONしてからヒーターが動作しウェイトア
ンプする(コピー動作、即ち画像形成動作が可能となる
状態)までの間、前記反射板11によるLE[I 12
からの光の反射光量をセンサ13により検知し、その検
知光量が規定レベル以下であった場合は、定着ヒーター
がコピーに適する温度となった場合でも、ウェイトアン
プしない様に構成した。Therefore, during the period from when the power is turned on until the heater operates and weight amplifies (a state in which a copy operation, that is, an image forming operation is possible), the LE [I 12
The sensor 13 detects the amount of reflected light from the printer, and if the detected amount of light is below a specified level, weight amplification is not performed even if the fixing heater reaches a temperature suitable for copying.
第2図、3図は結露現象が発生した場合の反射板11の
反射状況を説明したものである。14は反射板11の反
射面、15は反射面14に付着した水滴を示している。FIGS. 2 and 3 illustrate the reflection state of the reflector 11 when a dew condensation phenomenon occurs. Reference numeral 14 indicates a reflective surface of the reflective plate 11, and reference numeral 15 indicates water droplets attached to the reflective surface 14.
第2図は結露していない場合で、LED 12より照射
される光はほぼ受光素子13により検知出来るが、第3
図の様に水滴15が反射面14に刺着すると、LED
l 2よりの光が散乱されて、受光素子13に到達する
光はごくわずかとなってしまう。これを利用して結露を
検知するものであるが、LEDl 2から照射される光
が一方向になる様についたて16を設けるとさらに効果
が上がる。Figure 2 shows a case where there is no condensation, and most of the light emitted from the LED 12 can be detected by the light receiving element 13, but the third
When the water droplet 15 sticks to the reflective surface 14 as shown in the figure, the LED
The light from l2 is scattered, and only a small amount of light reaches the light receiving element 13. This is used to detect dew condensation, but the effect will be even better if the vertical 16 is provided so that the light emitted from the LED 1 2 is directed in one direction.
また、反射板の材質としては、光学系に使用されている
ミラーあるいはレンズ等と同じものが好ましい。これは
、結露現象が熱容量の大きい金属やガラスに生じやすく
、正確にミラーやレンズの結露を検知するためには同じ
材質で同じ程度の厚みを持つものを反射板とするのが良
いからである。Further, the material of the reflecting plate is preferably the same as that of the mirror, lens, etc. used in the optical system. This is because dew condensation tends to occur on metals and glass that have a large heat capacity, and in order to accurately detect condensation on mirrors and lenses, it is best to use reflective plates made of the same material and of the same thickness. .
尚、受光素子13によって露結現象が検出された場合は
、ファン17、ヒーター18を作動させ、前記光学系、
及び反射板11に温風を送風し、結露を蒸発除去するよ
うにするとよい。Incidentally, when a dew condensation phenomenon is detected by the light receiving element 13, the fan 17 and the heater 18 are operated, and the optical system,
It is also preferable to blow warm air onto the reflecting plate 11 to evaporate and remove dew condensation.
尚、LED 12の照射光の反射板11への入射角を4
5°以上に設定すれば、水滴による光の散乱がより大き
くなり、結露による、受光素子13の受光光量の低下が
より大きくなる為、より高精度の検出が可能となる。Incidentally, the angle of incidence of the irradiated light from the LED 12 on the reflecting plate 11 is set to 4.
If the angle is set to 5° or more, the scattering of light by water droplets becomes greater, and the decrease in the amount of light received by the light receiving element 13 due to dew condensation becomes greater, so that more accurate detection becomes possible.
また感光ドラム9の代りにCOD等の固体撮像素子を使
用し、原稿画像を電気信号に変換する装置にも本発明は
適用できる。The present invention can also be applied to an apparatus that uses a solid-state image pickup device such as a COD instead of the photosensitive drum 9 and converts an original image into an electrical signal.
第1図は本発明の詳細な説明図、第2図。
第3図はその要部説明図にして、4,5,6.8はミラ
ー、7はレンズ、11は反射板、■2は発光素子、13
は受光素子である。
出願人 キャノン株式会社FIG. 1 is a detailed explanatory diagram of the present invention, and FIG. Figure 3 is an explanatory diagram of the main parts, 4, 5, 6.8 are mirrors, 7 is a lens, 11 is a reflector, 2 is a light emitting element, 13
is a light receiving element. Applicant Canon Co., Ltd.
Claims (1)
成装置において、該光学系を構成するミラーあるいは投
影レンズの近傍に、該ミラーあるいは投影レンズとほぼ
同じ材質から成る反射板と、該反射板へ光を照射する発
光素子と、該反射板へ照射された該発光素子よりの光を
受光する受光素子と、を配置し、該受光素子の出力を用
いて該ミラー或いは該レンズが露結しているか否かを検
知することを特徴とする画像形成装置。 (2、特許請求の範囲第1項に記載の装置において、電
源スィッチをONしてからウェイトアンプして画像形成
動作可能となるまでの間、前記発光素子および前記受光
素子を動作させ、該受光素子による検知光量が規定レベ
ル以下である場合、ウェイトアップしないことを特徴と
する画像形成装置。(1) In an image forming apparatus that projects an original image onto a photosensitive surface using an optical system, a reflecting plate made of substantially the same material as the mirror or projection lens is provided near the mirror or projection lens constituting the optical system; A light-emitting element that irradiates light to the plate and a light-receiving element that receives light from the light-emitting element that is irradiated to the reflection plate are arranged, and the output of the light-receiving element is used to dew the mirror or the lens. An image forming apparatus characterized by detecting whether or not the (2. In the apparatus according to claim 1, the light emitting element and the light receiving element are operated from the time when the power switch is turned on until the time when the image forming operation is enabled by weight amplification, and the light receiving element is operated. An image forming apparatus characterized in that the weight does not increase when the amount of light detected by the element is below a specified level.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11766084A JPS60260934A (en) | 1984-06-08 | 1984-06-08 | Picture image forming device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11766084A JPS60260934A (en) | 1984-06-08 | 1984-06-08 | Picture image forming device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS60260934A true JPS60260934A (en) | 1985-12-24 |
Family
ID=14717136
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11766084A Pending JPS60260934A (en) | 1984-06-08 | 1984-06-08 | Picture image forming device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS60260934A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2552092A1 (en) * | 2011-07-26 | 2013-01-30 | Kyocera Document Solutions Inc. | Image scanning apparatus capable of detecting condensation |
-
1984
- 1984-06-08 JP JP11766084A patent/JPS60260934A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2552092A1 (en) * | 2011-07-26 | 2013-01-30 | Kyocera Document Solutions Inc. | Image scanning apparatus capable of detecting condensation |
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