JPH0518409B2 - - Google Patents
Info
- Publication number
- JPH0518409B2 JPH0518409B2 JP60145348A JP14534885A JPH0518409B2 JP H0518409 B2 JPH0518409 B2 JP H0518409B2 JP 60145348 A JP60145348 A JP 60145348A JP 14534885 A JP14534885 A JP 14534885A JP H0518409 B2 JPH0518409 B2 JP H0518409B2
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- fluorescent lamp
- supply circuit
- circuit
- preheating
- 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
- 230000010355 oscillation Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 108091008695 photoreceptors Proteins 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 5
- 238000004140 cleaning Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003079 width control Methods 0.000 description 1
Landscapes
- Exposure Or Original Feeding In Electrophotography (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
- Control Or Security For Electrophotography (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は電子複写機等に用いる電源回路に関す
る。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a power supply circuit used in electronic copying machines and the like.
（従来の技術）
電子複写機は、帯電されたドラムに原稿情報に
応じた露光を行つた後、ドラム表面に形成された
静電潜像にトナーの可視像を形成せしめ、トナー
可視像をコピー用紙に転写せしめる装置である。(Prior Art) An electronic copying machine exposes a charged drum to light according to document information, and then forms a toner visible image on an electrostatic latent image formed on the drum surface. This is a device that transfers images onto copy paper.
第２図はこのような電子複写機の従来構成例を
示す図である。操作者がコピースタートボタン
（図示せず）を押すと、図に示す装置はコピー動
作を開始する。矢印方向に回転している感光ドラ
ム１は、クリーニング部２で感光ドラム上の残余
トナーがブレードによつて削り取られた後、帯電
極３によりコロナ放電されてその表面に＋極の電
荷がその表面全面に帯電させられる。帯電極３に
よつて帯電させられた電荷は、帯電消去部４によ
つて不要部分の電荷が除去させられる。 FIG. 2 is a diagram showing an example of the conventional configuration of such an electronic copying machine. When the operator presses a copy start button (not shown), the illustrated device begins a copy operation. The photosensitive drum 1, which is rotating in the direction of the arrow, is cleaned by a blade in the cleaning section 2, after which the residual toner on the photosensitive drum is scraped off by a blade, and then corona discharge is applied to the surface of the photosensitive drum 1 by a charging electrode 3, so that a positive charge is applied to the surface of the photosensitive drum 1. The entire surface is charged. Unnecessary portions of the charge charged by the charging electrode 3 are removed by a charge erasing section 4.
一方、螢光灯点灯回路５によりオンオフ制御さ
れる露光部６からは、原稿台７に載置された原稿
８に光が照射され、その反射光は光伝送体の一例
であるセルフオツクレンズ（日本板硝子株式会社
製）９にて集光され感光ドラム１に照射される。
ここで、原稿台７を図の矢印方向に水平移動させ
ると、原稿８上の画像情報がセルフオツクレンズ
９で集光されて感光ドラム１に順次照射される。
この結果、帯電消去部４によつて不要部分（非画
像領域に相当する領域）が帯電消去され、画像を
形成すべき感光ドラム表面の帯電領域には、順次
原稿画像情報の静電潜像が形成される。感光ドラ
ム１の表面に形成された静電潜像は、続く現像部
１０でトナーが吸着され可視像に変換される。感
光ドラム表面のトナー画像は転写部１１でコピー
用紙に転写され、感光ドラム１に密着しているコ
ピー用紙は分離される。分離されたコピー用紙
は、搬送機構１２を介して定着ローラ１３に送ら
れ、該定着ローラ１３でコピー用紙は加熱、加圧
され該コピー用紙上のトナーがコピー用紙に融着
され、コピー動作が終了する。 On the other hand, an exposure section 6 whose on/off control is controlled by a fluorescent lamp lighting circuit 5 irradiates light onto a document 8 placed on a document table 7, and the reflected light is transmitted through a self-cleaning lens (an example of a light transmitting body). (manufactured by Nippon Sheet Glass Co., Ltd.) 9 and irradiates the photosensitive drum 1.
Here, when the document table 7 is horizontally moved in the direction of the arrow in the figure, the image information on the document 8 is focused by the self-occurring lens 9 and sequentially irradiated onto the photosensitive drum 1.
As a result, the unnecessary portion (area corresponding to the non-image area) is charged and erased by the charge erasing section 4, and an electrostatic latent image of the document image information is sequentially formed on the charged area of the photosensitive drum surface where an image is to be formed. It is formed. The electrostatic latent image formed on the surface of the photosensitive drum 1 is converted into a visible image by adsorption of toner in the subsequent developing section 10. The toner image on the surface of the photosensitive drum is transferred to a copy paper in a transfer section 11, and the copy paper that is in close contact with the photosensitive drum 1 is separated. The separated copy paper is sent to the fixing roller 13 via the conveyance mechanism 12, and the copy paper is heated and pressurized by the fixing roller 13 to fuse the toner on the copy paper to the copy paper, and the copying operation is completed. finish.
第３図は、露光部６の光源２０として用いられ
る螢光灯の構成図であり、イは斜視図、ロはＡ−
A′面の断面図である。図において、２１はピン、
２２は口金、２３は螢光管２４を取り囲んで形成
されたヒータ、２５はヒータ２３の発熱部であ
る。該発熱部２５は、例えばロに示すように螢光
管２４の周囲に貼り付けられ、その上から熱収縮
チユーブ（図示せず）等で固定されることもあ
る。或いは螢光管２４の周囲にそのまま貼付され
る。２６，２７はヒータ２３に電流を印加するた
めの電極、２８は反射膜兼螢光膜、２９は開口部
（アパーチヤ部）である。ヒータ２３は螢光管２
４の管壁温度を早く上昇させるために設けられて
いる。 FIG. 3 is a configuration diagram of a fluorescent lamp used as the light source 20 of the exposure section 6, where A is a perspective view and B is a perspective view.
FIG. 3 is a cross-sectional view of plane A′. In the figure, 21 is a pin,
22 is a cap, 23 is a heater formed surrounding the fluorescent tube 24, and 25 is a heat generating portion of the heater 23. The heat generating portion 25 may be attached around the fluorescent tube 24 as shown in FIG. 2, for example, and may be fixed thereon with a heat shrink tube (not shown) or the like. Alternatively, it is directly attached around the fluorescent tube 24. Reference numerals 26 and 27 are electrodes for applying current to the heater 23, 28 is a reflective film/fluorescent film, and 29 is an opening (aperture). Heater 23 is fluorescent tube 2
4 is provided to quickly increase the temperature of the tube wall.
このように構成された螢光灯の管壁温度と発光
光量との関係を示すと第４図に示すようなものと
なる。図において、横軸は螢光灯管壁温度、縦軸
は発光光量を示す。螢光灯の管壁温度が定着ロー
ラ１３内に設けられた定着ヒータのウオームアツ
プ時間内に、所定の基準値（図のt0）に達してい
ないと光量不足になる。温度t0における発光光量
はL0であり、螢光灯の管壁温度がウオームアツ
プ時間内にt0以上になつていないと光量がL0以下
となる光量不足を来たし、正確な画像の複写は不
可能になる。 The relationship between the tube wall temperature and the amount of emitted light of a fluorescent lamp constructed in this manner is shown in FIG. 4. In the figure, the horizontal axis shows the fluorescent tube wall temperature, and the vertical axis shows the amount of emitted light. If the tube wall temperature of the fluorescent lamp does not reach a predetermined reference value (t 0 in the figure) within the warm-up time of the fixing heater provided in the fixing roller 13, the amount of light will be insufficient. The amount of light emitted at a temperature t 0 is L 0 , and if the tube wall temperature of the fluorescent lamp does not rise above t 0 within the warm-up time, the light amount will be less than L 0 , resulting in an insufficient amount of light, making it impossible to reproduce an accurate image. becomes impossible.
そこで、このような螢光灯２０の光量不足を補
うために、例えば定着ローラ１３のウオームアツ
プ時には螢光灯２０を常時点灯して管壁温度の上
昇を早め、定着ローラ１３のウオームアツプが完
了するまでに管壁温度を基準値t0以上にすること
が行われている。 Therefore, in order to compensate for such a lack of light intensity of the fluorescent lamp 20, for example, when the fixing roller 13 is being warmed up, the fluorescent lamp 20 is always turned on to accelerate the rise in tube wall temperature, and the warming up of the fixing roller 13 is completed. The tube wall temperature is kept at or above the reference value t 0 by the time the tube wall temperature reaches the standard value t0.
ところで、従来のこのような電子複写機では、
第５図に示すような電源回路が用いられていた。
第５図において、３１はスイツチング電源回路を
構成する発振制御部であり、該発振制御部３１に
は直流電源回路３２、螢光灯予熱電源回路３３及
び螢光灯点灯電源回路３４が並列に接続されてい
る。ここで、直流電源回路３２は電子複写機の各
部に直流電源を供給し、螢光灯予熱電源回路３３
は予熱回路３５に電源を供給し、螢光灯点灯電源
回路３４は点灯回路３６に電源を供給するもので
ある。 By the way, with such conventional electronic copying machines,
A power supply circuit as shown in FIG. 5 was used.
In FIG. 5, 31 is an oscillation control section constituting a switching power supply circuit, and a DC power supply circuit 32, a fluorescent lamp preheating power supply circuit 33, and a fluorescent lamp lighting power supply circuit 34 are connected in parallel to the oscillation control section 31. has been done. Here, the DC power supply circuit 32 supplies DC power to each part of the electronic copying machine, and the fluorescent lamp preheating power supply circuit 33
supplies power to the preheating circuit 35, and the fluorescent lamp lighting power supply circuit 34 supplies power to the lighting circuit 36.
（発明が解決しようとする問題点）
ところで、このような電源回路では、螢光灯予
熱電源回路３３は常時予熱回路３５に電源を供給
し、螢光灯点灯電源回路３４は常時点灯回路３６
に電源を供給するように構成されていた。即ち、
これら予熱回路３５及び点灯回路３６への電源供
給は直流電源回路３２への電源供給とリンクされ
ていて、直流電源回路３２へ電源を供給している
状態では予熱回路３５及び点灯回路３６も常に駆
動されることになつて螢光灯２０の寿命を早める
ことになり、予熱回路３５及び点灯回路３６への
電源供給をオフにするためには発振制御部３１か
らの出力をオフにしなければならないことから直
流電源回路３２の出力もオフになつて電子複写機
の螢光灯回路以外の回路も動作不可能になつてし
まうことになる。また、電源回路を別々に構成し
て、各電源回路が独立して制御可能に構成するこ
とも可能である。しかし、各電源回路を別々のブ
ロツクに構成することで、回路の無駄が多くなる
問題を有している。(Problems to be Solved by the Invention) In such a power supply circuit, the fluorescent lamp preheating power supply circuit 33 always supplies power to the preheating circuit 35, and the fluorescent lamp lighting power supply circuit 34 supplies power to the constant lighting circuit 36.
was configured to provide power to the That is,
The power supply to these preheating circuit 35 and lighting circuit 36 is linked to the power supply to DC power supply circuit 32, and when power is being supplied to DC power supply circuit 32, preheating circuit 35 and lighting circuit 36 are always driven. This will shorten the life of the fluorescent lamp 20, and in order to turn off the power supply to the preheating circuit 35 and lighting circuit 36, the output from the oscillation control section 31 must be turned off. As a result, the output of the DC power supply circuit 32 is also turned off, and circuits other than the fluorescent light circuit of the electronic copying machine become inoperable. It is also possible to configure the power supply circuits separately so that each power supply circuit can be independently controlled. However, configuring each power supply circuit as a separate block has the problem of increased circuit waste.
本発明はこのような点に鑑みてなされたもので
あつて、その目的は、同一の電源ブロツクにおい
て螢光灯の予熱回路及び点灯回路への電源供給が
それぞれ独立して制御できる電源回路を実現する
ことにある。 The present invention has been made in view of these points, and its purpose is to realize a power supply circuit that can independently control the power supply to the preheating circuit and lighting circuit of a fluorescent lamp in the same power supply block. It's about doing.
（問題点を解決するための手段）
前記した問題点を解決する本発明は、螢光灯で
原稿面を照射し、その反射光を感光体に照射して
静電潜像を形成し、この静電潜像を現像してトナ
ー像を形成し、このトナー像をコピー用紙に定着
させる画像形成装置に用いられる電源回路であつ
て、
電圧変換を行うためのトランスと、
トランスの一次側に接続された発振制御部と、
トランスの二次側に接続され、画像形成装置の
各部に電力を供給するための直流電源回路と、
トランスの二次側に接続され、螢光灯の予熱に
必要な電力を供給する螢光灯予熱電源回路と、
トランスの二次側に接続され、螢光灯を点灯さ
せるのに必要な電力を供給する螢光灯点灯電源回
路とを備え、
螢光灯予熱電源回路と螢光灯点灯電源回路と
は、外部から与えられる制御信号により直流電源
回路からそれぞれ独立して電源供給の制御が行え
るものである。(Means for Solving the Problems) The present invention, which solves the problems described above, irradiates the document surface with a fluorescent lamp, and irradiates the photoreceptor with the reflected light to form an electrostatic latent image. A power supply circuit used in an image forming device that develops an electrostatic latent image to form a toner image and fixes this toner image on copy paper, and is connected to a transformer for voltage conversion and the primary side of the transformer. a DC power supply circuit connected to the secondary side of the transformer for supplying power to each part of the image forming apparatus, and a DC power supply circuit connected to the secondary side of the transformer for preheating the fluorescent lamp. The fluorescent lamp preheating power supply is equipped with a fluorescent lamp preheating power supply circuit that supplies electric power, and a fluorescent lamp lighting power supply circuit that is connected to the secondary side of the transformer and supplies the power necessary to light the fluorescent lamp. The power supply of the circuit and the fluorescent lamp lighting power supply circuit can be controlled independently from the DC power supply circuit by means of control signals applied from the outside.
（実施例）
以下、図面を参照して本発明の実施例を詳細に
説明する。(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
第１図は本発明の一実施例を示す回路図であ
り、第５図と同一のものは同一の番号を付して示
す。図において、３７は螢光灯予熱電源回路３３
に設けられた制御端子、３８は螢光灯点灯電源回
路３４に設けられた制御端子である。制御端子３
７には予熱回路３５への電源供給を制御するため
のオンオフリモート制御信号が加えられ、制御端
子３８には点灯回路３６への電源供給を制御する
ためのオンオフ制御信号又はパルス幅制御信号が
加えられる。 FIG. 1 is a circuit diagram showing an embodiment of the present invention, and the same parts as in FIG. 5 are designated by the same numbers. In the figure, 37 is a fluorescent lamp preheating power supply circuit 33.
A control terminal 38 is a control terminal provided in the fluorescent lamp lighting power supply circuit 34. Control terminal 3
An on/off remote control signal for controlling power supply to the preheating circuit 35 is applied to 7, and an on/off control signal or a pulse width control signal for controlling power supply to the lighting circuit 36 is applied to control terminal 38. It will be done.
このような構成において、発振制御部３１の出
力は常時直流電源回路３２、螢光灯予熱電源回路
３３及び螢光灯点灯電源回路３４に加えられてい
る。そして、螢光灯予熱電源回路３３から予熱回
路３５への電源供給は制御端子３７に加えられる
制御信号に従つて独立に制御され、螢光灯点灯電
源回路３４から点灯回路３６への電源供給は制御
端子３８に加えられる制御信号に従つて独立に制
御される。 In such a configuration, the output of the oscillation control section 31 is constantly applied to the DC power supply circuit 32, the fluorescent lamp preheating power supply circuit 33, and the fluorescent lamp lighting power supply circuit 34. The power supply from the fluorescent lamp preheating power supply circuit 33 to the preheating circuit 35 is independently controlled according to the control signal applied to the control terminal 37, and the power supply from the fluorescent lamp lighting power supply circuit 34 to the lighting circuit 36 is controlled independently. They are independently controlled according to a control signal applied to control terminal 38.
これにより、従来のように予熱回路３５及び点
灯回路３６への電源供給と直流電源回路３２への
電源供給とがリンクされることはなく、電子複写
機の螢光灯回路以外の回路を動作させた状態で予
熱回路３５及び点灯回路３６への電源供給をそれ
ぞれ独立して制御することができ、必要に応じて
予熱回路３５及び点灯回路３６への通電を停止す
ることによつて螢光灯２０の寿命を延ばすことが
できる。 As a result, the power supply to the preheating circuit 35 and lighting circuit 36 and the power supply to the DC power supply circuit 32 are not linked as in the past, and circuits other than the fluorescent lamp circuit of the electronic copying machine are operated. In this state, the power supply to the preheating circuit 35 and the lighting circuit 36 can be controlled independently, and the fluorescent lamp 20 can be stopped by stopping the power supply to the preheating circuit 35 and the lighting circuit 36 as necessary. The lifespan of can be extended.
尚、これら予熱回路３５及び点灯回路３６への
通電制御は、定着ローラのウオームアツプ時の螢
光灯の点灯制御にも有効である。即ち、例えば上
述第２図において螢光灯２０の光量を検出する光
量検出センサを設けておき、該光量検出センサに
よる検知光量が上述第４図の基準値L0を越えた
ら点灯回路３６への通電を停止して螢光灯２０の
点灯をオフにすればよい。又、螢光灯２０の管壁
温度を検出する温度検出センサを設けておき、管
壁温度が上述第４図の基準値t0を大きく越えた場
合には予熱回路３５への通電を停止するようにし
てもよい。 The power supply control to the preheating circuit 35 and the lighting circuit 36 is also effective in controlling the lighting of the fluorescent lamp when the fixing roller is warmed up. That is, for example, a light amount detection sensor is provided to detect the light amount of the fluorescent lamp 20 in FIG. What is necessary is to stop the electricity supply and turn off the lighting of the fluorescent lamp 20. Further, a temperature detection sensor is provided to detect the temperature of the tube wall of the fluorescent lamp 20, and if the tube wall temperature greatly exceeds the reference value t0 shown in FIG. You can do it like this.
（発明の効果）
以上詳細に説明したように、本発明によれば、
同一の電源ブロツク内において螢光灯の予熱回路
及び点灯回路への電源供給がそれぞれ独立して制
御できる電源回路が実現でき、螢光灯の寿命を延
ばすことができる。(Effects of the Invention) As explained in detail above, according to the present invention,
A power supply circuit can be realized in which the power supply to the preheating circuit and the lighting circuit of the fluorescent lamp can be independently controlled within the same power supply block, and the life of the fluorescent lamp can be extended.
第１図は本発明の一実施例を示す回路図、第２
図は電子複写機の従来構成例を示す図、第３図は
螢光灯の構成例を示す図、第４図は螢光灯の発光
光量特性を示す図、第５図は従来の電源回路例を
示す図である。
２０……螢光灯、３１……発振制御部、３２…
…直流電源回路、３３……蛍光灯予熱電源回路、
３４……蛍光灯点灯電源回路、３５……予熱回
路、３６……点灯回路、３７，３８……制御端
子。
Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure shows an example of the conventional configuration of an electronic copying machine, Figure 3 shows an example of the configuration of a fluorescent lamp, Figure 4 shows the light emission characteristics of a fluorescent lamp, and Figure 5 shows a conventional power supply circuit. It is a figure which shows an example. 20...Fluorescent lamp, 31...Oscillation control unit, 32...
...DC power supply circuit, 33...Fluorescent lamp preheating power supply circuit,
34... Fluorescent lamp lighting power supply circuit, 35... Preheating circuit, 36... Lighting circuit, 37, 38... Control terminal.
Claims (1)
体に照射して静電潜像を形成し、この静電潜像を
現像してトナー像を形成し、このトナー像をコピ
ー用紙に定着させる画像形成装置に用いられる電
源回路であつて、 電圧変換を行うためのトランスと、 トランスの一次側に接続された発振制御部と、 トランスの二次側に接続され、画像形成装置の
各部に電力を供給するための直流電源回路と、 トランスの二次側に接続され、螢光灯の予熱に
必要な電力を供給する螢光灯予熱電源回路と、 トランスの二次側に接続され、螢光灯を点灯さ
せるのに必要な電力を供給する螢光灯点灯電源回
路とを備え、 螢光灯予熱電源回路と螢光灯点灯電源回路と
は、外部から与えられる制御信号により直流電源
回路からそれぞれ独立して電源供給の制御が行え
るものであることを特徴とする電源回路。[Scope of Claims] 1. Irradiating the document surface with a fluorescent lamp, irradiating the reflected light onto a photoreceptor to form an electrostatic latent image, and developing this electrostatic latent image to form a toner image, A power supply circuit used in an image forming apparatus that fixes this toner image onto copy paper, which includes a transformer for voltage conversion, an oscillation control section connected to the primary side of the transformer, and a secondary side of the transformer. A fluorescent lamp preheating power supply circuit connected to the secondary side of the transformer and supplying power necessary for preheating the fluorescent lamp; A fluorescent lamp lighting power supply circuit is connected to the secondary side and supplies the power necessary to light the fluorescent lamp.The fluorescent lamp preheating power supply circuit and the fluorescent lamp lighting power supply circuit are supplied from the outside. 1. A power supply circuit characterized in that power supply can be controlled independently from each DC power supply circuit using control signals provided by the DC power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60145348A JPS626237A (en) | 1985-07-02 | 1985-07-02 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60145348A JPS626237A (en) | 1985-07-02 | 1985-07-02 | Power supply circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS626237A JPS626237A (en) | 1987-01-13 |
| JPH0518409B2 true JPH0518409B2 (en) | 1993-03-11 |
Family
ID=15383106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60145348A Granted JPS626237A (en) | 1985-07-02 | 1985-07-02 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS626237A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS633649A (en) * | 1986-06-24 | 1988-01-08 | Canon Inc | Power source device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61154358A (en) * | 1984-12-27 | 1986-07-14 | Toshiba Corp | Information reader |
-
1985
- 1985-07-02 JP JP60145348A patent/JPS626237A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61154358A (en) * | 1984-12-27 | 1986-07-14 | Toshiba Corp | Information reader |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS626237A (en) | 1987-01-13 |
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