JPH0350257B2 - - Google Patents
Info
- Publication number
- JPH0350257B2 JPH0350257B2 JP15349482A JP15349482A JPH0350257B2 JP H0350257 B2 JPH0350257 B2 JP H0350257B2 JP 15349482 A JP15349482 A JP 15349482A JP 15349482 A JP15349482 A JP 15349482A JP H0350257 B2 JPH0350257 B2 JP H0350257B2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- heater
- fluorescent lamp
- control
- heaters
- 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 - Lifetime
Links
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
- G03B27/52—Details
- G03B27/54—Lamp housings; Illuminating means
- G03B27/542—Lamp housings; Illuminating means for copying cameras, reflex exposure lighting
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
- Discharge Lamps And Accessories Thereof (AREA)
Description
【発明の詳細な説明】 本発明は複写機の照明装置に関する。[Detailed description of the invention] The present invention relates to a lighting device for a copying machine.
複写機の露光用光源として使用していた螢光灯
は、管壁温度によつて光出力が大きく変動する傾
向がある。又、この螢光灯はその構造上、両端部
の温度は高く、これに対して中央部の温度は低く
なる性質を有していた。そこで、この螢光灯の光
出力の変動をなくすためには、螢光灯の管壁温度
を全体に亘つて一定にする必要があつた。その方
法として、従来は一枚のヒーターを使つて、上記
螢光灯の管壁温度を制御する方法が採用されてい
た。しかるに、この方法は温度を検知する個所が
螢光灯の中心部一点であり、この温度によつてヒ
ーター全体を制御するため、細かい温度制御は難
しく、従つて、螢光灯全体の温度の分布が、季節
や室内環境等による雰囲気温度によつて変わつて
しまうと言う欠点を有していた。 Fluorescent lamps used as exposure light sources in copying machines tend to have a tendency for light output to vary greatly depending on the temperature of the tube wall. Furthermore, due to its structure, this fluorescent lamp had a property that the temperature at both ends was high, whereas the temperature at the center was low. Therefore, in order to eliminate fluctuations in the light output of the fluorescent lamp, it was necessary to keep the tube wall temperature of the fluorescent lamp constant throughout. Conventionally, this method uses a single heater to control the temperature of the tube wall of the fluorescent lamp. However, with this method, the temperature is detected at a single point in the center of the fluorescent lamp, and the entire heater is controlled based on this temperature, making it difficult to precisely control the temperature. However, it has the disadvantage that it changes depending on the atmospheric temperature due to the season, indoor environment, etc.
本発明は、以上のような欠点を除去するために
なされたものであつて、露光用ランプのヒーター
は、螢光灯の両端部と中央部とに多分割に設置
し、中央部に設置したヒーターは、当該個所に温
度検出器を取付け、この温度検出器を介して温度
制御をするようにすると共に、両端部のヒーター
は、自己制御型のヒーターを使用して行うように
した、複写機の照明装置を提供することを目的と
する。 The present invention was made in order to eliminate the above-mentioned drawbacks, and the heater of the exposure lamp is installed in multiple parts at both ends and the center of the fluorescent lamp, and the heater is installed in the center. The heater is equipped with a temperature sensor at the relevant location, and the temperature is controlled via this temperature sensor, and the heaters at both ends are self-control type heaters. The purpose is to provide a lighting device for
以下本発明を、図面に示す実施例に基づいて説
明する。 The present invention will be described below based on embodiments shown in the drawings.
第１図は本発明の一実施例を示す斜視図であ
る。即ち、この図において、本発明は、螢光灯１
の両端部には自己制御型のヒーター２，２′を設
置し、中心部には温度検出器３を備えたヒーター
４を設置したものであり、ヒーター４は上記温度
検出器３を介して温度制御するようにしたもので
ある。その温度制御法は、第２図に、一実施例を
回路図で示したように、図中５の抵抗によつて温
度を設定し、この設定値に対して、螢光灯１の管
壁の温度の変化を温度検出器３が検知し、その検
出電圧を増幅器６で増幅し、その出力をトライア
ツク・トリガー回路７を介してトライアツク８に
送り、当該トライアツク８を駆動してヒーター４
を制御するものである。 FIG. 1 is a perspective view showing an embodiment of the present invention. That is, in this figure, the present invention has a fluorescent lamp 1
Self-control type heaters 2 and 2' are installed at both ends of the heater 4, and a heater 4 equipped with a temperature sensor 3 is installed at the center. It was designed to be controlled. The temperature control method, as shown in the circuit diagram of one embodiment in FIG. The temperature detector 3 detects a change in the temperature of
It controls the
尚、図中９は交流電源であり、１０は回路用直
流電源を示す。 In the figure, 9 is an AC power supply, and 10 is a circuit DC power supply.
本発明は以上のように構成したものである。 The present invention is constructed as described above.
而して、今複写機の電源を投入すると、螢光灯
１のヒーター２，２′及びヒーター４のスイツチ
がONになつて螢光灯１の管壁が温められて複写
が可能な温度になる。この状態で複写を行なうも
のであるが、その工程中に螢光灯１の両端部の管
壁の温度が所定の温度よりも上昇した時には、ヒ
ーター２，２′を制御して温度を下げ、所定の温
度に保つようにする。その方法としては当該個所
が中央部に比較して高温になる性質を有している
関係上、さほど緻密な制御手段でなくても良く、
従つて感熱リードリレーや感熱サイリスタ等によ
るON、OFF制御でこれを行う。これに対して、
中央部の管壁の温度は、上記両端部よりも低くな
る関係上、その温度の変化を、温度検出器３で細
かく検知し、ヒーター４を緻密に作動させて、螢
光灯１全体の温度が常時一定の状態にあるように
する。 Now, when you turn on the power to the copying machine, the switches for heaters 2, 2' and heater 4 of fluorescent lamp 1 are turned on, and the tube wall of fluorescent lamp 1 is heated to a temperature at which copying is possible. Become. Copying is carried out in this state, but if the temperature of the tube walls at both ends of the fluorescent lamp 1 rises above a predetermined temperature during the process, the heaters 2 and 2' are controlled to lower the temperature. Make sure to maintain the specified temperature. The method for this does not require very precise control means, as the temperature in this area tends to be higher than that in the center.
Therefore, this is done through ON/OFF control using heat-sensitive reed relays, heat-sensitive thyristors, etc. On the contrary,
Since the temperature of the tube wall at the center is lower than that at both ends, the temperature detector 3 precisely detects changes in the temperature, and the heater 4 is precisely operated to determine the temperature of the entire fluorescent lamp 1. be in a constant state at all times.
本発明は以上のように構成し、且つ作動するも
のであり、螢光灯１に対してヒーター２，２′及
び４を両端部と中央部とに分割して設置し、夫々
制御法を異にすることによつて、螢光灯１の管壁
の温度を常に一定の状態に保つことができるの
で、螢光灯自体の光出力が、大きく変動すること
はなくなり、従つて最終的には良質なコピーを得
ることができると言つた利点と、上記ヒーター
２，２′及び４が分割されているため、リレーや
サイリスタの電気容量は小さくて済むと言つた利
点、並びに上述のように螢光灯１の管壁の必要な
部分にのみ、温度検出器を取付けてヒーター制御
をするようにすることによつて制御回路の小型化
も可能となるし、又上記ヒーター４の材質を、正
特性サーミスタのような、正の温度係数をもつた
ヒーターを使用した、定温発熱体にすれば、常に
或電圧をヒーター４にかけておくことにより、一
定の温度に安定し、外部から制御する必要がない
ようにすることもできると言つた利点も有する。 The present invention is constructed and operates as described above, and the heaters 2, 2', and 4 are installed separately at both ends and in the center of the fluorescent lamp 1, and the control methods are different for each. By doing so, the temperature of the tube wall of the fluorescent lamp 1 can be kept constant at all times, so the light output of the fluorescent lamp itself will not fluctuate greatly, and therefore, ultimately There are two advantages: high-quality copies can be obtained, the electrical capacity of relays and thyristors can be small because the heaters 2, 2', and 4 are divided, and the above-mentioned advantage is that it is possible to obtain high quality copies. By attaching a temperature sensor to only the required part of the tube wall of the light lamp 1 to control the heater, it is possible to downsize the control circuit. If you use a constant temperature heating element using a heater with a positive temperature coefficient, such as a characteristic thermistor, by always applying a certain voltage to the heater 4, the temperature will be stable at a constant level, and there is no need to control it externally. It also has the advantage that it can be done as follows.
第１図は本発明の、ヒーター並びに温度検出器
を螢光灯に取付けた状態を示す斜視図、第２図は
同、温度検出器を備えたヒーターの回路図であ
る。
１……螢光灯、２，２′……ヒーター、３……
温度検出器、４……ヒーター。
FIG. 1 is a perspective view showing a state in which a heater and a temperature detector according to the present invention are attached to a fluorescent lamp, and FIG. 2 is a circuit diagram of the same heater equipped with a temperature detector. 1...Fluorescent lamp, 2,2'...Heater, 3...
Temperature detector, 4...heater.
Claims (1)
て、露光用ランプのヒーターを、ランプの長手方
向に対して多分割的に設置して温度を制御する照
明装置において、中心部のヒーターのみを温度検
出器を設けて温度制御を行ない、他のヒーターは
自己制御型ヒーターを使用したことを特徴とす
る、複写機の照明装置。1. In a copying machine that uses a fluorescent lamp as the light source for exposure, in a lighting system in which the heater for the exposure lamp is installed in multiple sections along the length of the lamp to control the temperature, only the heater in the center is installed. A lighting device for a copying machine, characterized in that a temperature detector is provided to control the temperature, and other heaters are self-control type heaters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15349482A JPS5942534A (en) | 1982-09-03 | 1982-09-03 | Lighting device of copying machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15349482A JPS5942534A (en) | 1982-09-03 | 1982-09-03 | Lighting device of copying machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5942534A JPS5942534A (en) | 1984-03-09 |
| JPH0350257B2 true JPH0350257B2 (en) | 1991-08-01 |
Family
ID=15563780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15349482A Granted JPS5942534A (en) | 1982-09-03 | 1982-09-03 | Lighting device of copying machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5942534A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4827313A (en) * | 1988-07-11 | 1989-05-02 | Xerox Corporation | Mechanism and method for controlling the temperature and output of an amalgam fluorescent lamp |
| US5029311A (en) * | 1990-09-28 | 1991-07-02 | Xerox Corporation | Stabilized fluorescent lamp for a document scanning system |
-
1982
- 1982-09-03 JP JP15349482A patent/JPS5942534A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5942534A (en) | 1984-03-09 |
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