JPS6086536A - Copying device - Google Patents

Abstract

PURPOSE:To expose collectively the whole original surface having a large area by providing a copying machine with four or more original exposing flashing lamps, a lighting circuit for lighting simultaneously these lamps to expose collectively, main discharging capacitors for the flashing lamps and their charging circuit. CONSTITUTION:In the flashing lamp lighting circuit 10, a trigger circuit driving signal is inputted to an input terminal P after the completion of charge to the main discharging capacitors C1-C4 by the charging circuit 100. Consequently, the trigger circuits T1-T4 are actuated and trigger voltages are generated in trigger electrodes W1-W4. The flashing lamps 21-24 generate simultaneously flashes having short pulse width on the basis of the triggr voltages. The whole surfaces of the original is collectively exposed by the flashes, the reflected light from the original surface is projected to the surface of a photosensitive body and its original image is formed, developed by a developing device and then transferred. Thus, the whole original surface having a large area can be collectively exposed with sufficiently bright illumination in an extremely short period.

Description

[Detailed description of the invention] The present invention relates to a copying apparatus.

Conventionally, elongated tube-shaped halogen bulbs and continuous-on discharge lamps have been used as light sources for document exposure in copying machines VcX such as electrophotographic copying machines, but the light sources of both sources are relatively small in nature. In order to obtain a copy image with sufficient density, it is necessary to illuminate the surface of the original for a relatively long period of time. However, it is difficult to achieve high-speed copying even if the original document is exposed to light.For this reason, it has recently been considered to use a flashing discharge lamp, which is originally much larger, as a light source for exposing an original.

When using a flash charge/discharge lamp as a light source for t-exposure, the entire surface of the document is exposed at once with flash light, and the belt-like flat photoconductor is moved at high speed while the document is placed on the photoconductor. 'M:, 18! It is possible to achieve high-speed copying since it is possible to project images. In this case, in order to obtain a good copy image without blur,
It is necessary to project onto an original GLT photoreceptor that is faithful to the original, and to achieve this, it is practically required that the flash width be approximately 200 .mu.sec or more.

10,000, if the size of the document is large, such as B4 size or A3 size, [if the size of the document is large, such as B4 size or A3 size,
As the pulse width is required and the energy required for exposure is large, a flash discharge lamp with high output is required.
As the output of flash discharge lamps increases, they become difficult to manufacture and extremely expensive, and they also become larger. Therefore, it is necessary to combine multiple small flash discharge lamps with short arc lengths and short arc lengths to create a light source for exposure. It is a good idea to configure it. Furthermore, considering the amount of element distributed during exposure, it is necessary to strictly control the illuminance distribution in the exposed area of the original in order to equalize the illuminance of the original image formed on the photoreceptor. Yes, and to easily achieve this, it is best to use at least four flash discharge lamp sounds! Yes.

When using a combination of four or more VC flash discharge lamps, it is necessary to light all the flash discharge lamps at the same time. Therefore, if you take this point into consideration, you can make sure that if even one of the flash discharge lamps goes out, all the flash discharge lamps will not turn on. Electrically interchange all flash discharge lamps.
Consider connecting to the c@ column.

However, when connecting all flash discharge lamps in series, the charging voltage of the main discharge capacitor for supplying flash energy must be increased according to the number of flash discharge lamps. 8 in the flash discharge lamp lighting circuit,
The main discharge capacitor became expensive and had a high withstand voltage, and the power transformer became large.In the end, the advantage of using multiple flash discharge lamps was that the flash discharge lamp lighting circuit could be made smaller at a lower cost and faster. The advantage of being able to achieve copying would be lost.

The present invention has been made based on the above-mentioned circumstances, and it is an object of the present invention to make a flash discharge lamp lighting circuit low-cost and compact, and to simultaneously expose the entire surface of a large-area document with sufficient illuminance and in an extremely short time. The purpose of the present invention is to provide a copying apparatus capable of achieving good high-speed copying, and its features include at least four flash discharge lamps for exposing the original, which are arranged to face the original. , and a flash discharge lamp lighting circuit for simultaneously lighting all of the discharge lamps for exposing the original to expose the entire surface of the original at once; The main discharging capacitor is connected to each of the flash discharge lamps, and a common charging circuit is used to photoelectrically charge these main discharging capacitors.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing the main part of the copying machine.

1 is an original table; 21, 22, 23.24 are flash discharge lamps for exposing the original; 3i, 32, 33.34 are collectors arranged close to the n original exposure flash discharge lamps 21, 22, 23, and 24, respectively. A source mirror, 4 a projection lens, 5 a belt-shaped photoreceptor that is moved along a horizontal plane, 6 a developing device, 7 a transfer device, 8
1 is a transfer paper, 9 is a fixing device, and 10 is a flash discharge lamp lighting circuit.

The four original exposure flash discharge lamps 21, 22, 23°2
4 is placed below the four side lines of the document table l, as shown in FIG. They are arranged in a rectangular shape. An example of a specific configuration of the original exposure flash discharge lamps 21, 22, 23, and 24 of Cn et al. is shown in Table 1 below.

Table 1 Figure 3 shows an example of flash discharge lamp lighting times W & 10, and lO
0 is a charging circuit connected to an alternating current power source AC via a power source SWi, and between the output terminals of this photoelectric circuit 10, seven parallel connections are made between a guide D1 and a main discharge capacitor C1. A series circuit, a series circuit of diode D2 and main discharge capacitor C2, a series circuit of diode D3 and main discharge capacitor C3, and a series circuit of diode D4 and main discharge capacitor C4 are connected. Wl,
W2. W3. W4 is a flash discharge lamp 21 for exposing the original.
, 22, 23, and 24 are the trigger electrodes placed along the tube wall. These trigger electrodes W1, w2.
W6. W, are trigger circuits TI and T2, respectively.
, T3, and T41c are connected, and when the signal is input to the common input terminal P of the trigger circuit drive signal, K is the trigger circuit TI.

“2 +”3 r Trigger electrodes from T4 respectively w
1. w2゜W3. A trigger voltage is simultaneously applied to W4 to the main discharge capacitors C1, C2, C6, and C4.
For example, the capacity of is about 600μF, and when charging is completed, the
The voltage applied is, for example, about 350V.

The charging circuit 100 includes a power transformer and a rectifier circuit, and is configured using a suinotengunguta type or other type.

101 is a non-lighting signal generation circuit) This non-lighting signal generating circuit 101 is a main discharge capacitor CI p C2
, C5,04F') Positive fltOFC'Ct'l-Thre'
A common W formed by connecting the cathodes of the backflow prevention diode D5.D6゜D7.D8 to which the C (D 7 /- terminal is connected) and the cathode of the backflow prevention diode IJ5.D6゜D7.D8 from the com. It receives a signal from the blade end A through its 10,000 input terminal d, and receives a source command signal inputted to input terminal Q in response to the occurrence of the trigger circuit drive signal from the other input terminal e. , and an AND circuit AND which outputs an AND signal of these input signals from an output terminal f.This AND circuit ANDlc% receives a command signal from the other input terminal etc, and at the same time, - For example, the voltage value at the time when the main discharge capacitors C1, C2, C3, and C4 are fully charged, or a signal slightly smaller than this signal is input to the output terminal f. The F non-lighting signal is generated.The timing at which the input terminal QK source command signal is inputted is determined in response to the generation of the trigger circuit drive signal inputted to the input terminal P, but specifically, Difference ΔT in time from generation of trigger circuit drive signal to generation of flash
Taking this into account, the source command signal is input to the input terminal Q after a time Δ1'' from the generation of the trigger circuit drive signal. Preferably, the trigger circuit drive signal is delayed by a delay circuit.
There is a means to delay this by T and use it as a source command signal.The non-lighting signal generated by the output terminal f can be visualized by supplying it to, for example, a source diode, ξ iron lamp, or Alternatively, it is used as a signal to stop the operation of the charging circuit lθO.

According to the above embodiment, a copy image is formed in the following manner. That is, first, in the flash discharge lamp lighting circuit 1G, the main discharge capacitors C1, C2,
When the photoelectricity of C3 and C4 is completed, a trigger circuit drive signal is input to the input terminal IJ, and this nttxv ) IJ
Car circuit T1 + T2, i'31 T4 car f + Ei
f+ and trigger electrode W1. W2. W3. A trigger voltage is generated at W4. This trigger voltage causes the flash discharge lamps 21, 22, 23, and 24 for exposing the original to be activated at the same time.
A flash of light with a certain width is generated, and the entire surface of the document is exposed by this flash, and the source of reflection from the document surface is projected onto a belt-shaped photoreceptor 5 that is moving at high speed. A document image is formed. The original image on the photosensitive body 5 is transported and developed by a developing device 6, transferred to a transfer paper 8 by a transfer device 7, and fixed by a redundant device 9 to form a copy image.

In this way, a plurality of flash discharge lamps for exposing originals are electrically connected in parallel and turned on at the same time to expose all 1T of originals.
II'i Because the exposure 51e is carried out all at once, the flash energy required for one flash discharge lamp for exposing documents can be reduced, so each main discharge capacitor is replaced with a low-cost one with a small capacity. Moreover, the magnitude of the voltage supplied to each of the main discharge capacitors from the charging circuit 10 [1] is equal to the source voltage required for one flash discharge lamp for exposing the original. is sufficient, so it is possible to make a power transformer with a charging circuit of 100 VL% low cost and small, and in the end, the flash discharge lamp lighting circuit 10
? ]l-It is possible to simultaneously expose the entire surface of a large-area document with sufficient illuminance and in an extremely short period of time, while maintaining a low cost and small size, and can achieve good standard-speed copying.

Set the flash IJ for exposing the original! Since there are four or more electric lamps required, even those with short arc lengths can be placed along the I# and VC sides of the manuscript mill, for example, so the illuminance distribution in the exposed area of the manuscript can be strictly controlled. This can be easily achieved.

As described above, according to the non-lighting signal generation circuit 101, if even one of the flash discharge lamps for exposing the original is not lit, the main flash discharge lamp connected to the flash discharge lamp for exposing the original is not lit. Since the voltage across the discharge capacitor does not drop,
A non-lighting signal is generated from the output terminal f of the AND circuit AND, and from this it can be known that the non-lighting has rarely occurred.

As described above, the present invention provides at least four IfA document exposure light discharge lamps disposed to face the document, and all of these document path light and discharge lamps are turned on at the same time to expose the entire surface of the document. The flash discharge lamp lighting circuit includes a main discharge capacitor connected to each of the original exposure flash discharge lamps, and a main discharge capacitor connected to each of the original exposure flash discharge lamps. Since this copying device is characterized by including a common charging circuit for photoelectrically charging the capacitors used for the copying process, it is possible to make the flash discharge lamp lighting circuit low-cost and compact, and to cover the entire surface of a large document with the original illuminance. In addition, it is possible to perform a batch exposure in an extremely short period of time, and to achieve good high-speed copying.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an outline of an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the main part of Fig. 1, and Fig. 3 is an explanatory circuit diagram showing an example of a flash discharge lamp lighting circuit. be. l...Original table 21, 22, 23, 24...Flash discharge lamp for exposing the original 5...Photoconductor 6...Developer 7...Transfer device 8...Transfer paper 9...Fixer lO...Flash discharge lamp lighting circuit 100...Charging circuit D1tD2ID3pD4D5jD6. D7. D8...
・Diodes C1, C2, C3, C4...Main discharge capacitor 101...Non-lighting signal generation circuit AND...AND circuit agent Patent attorney Masahiko Ooi Procedural amendment (spontaneous) 1981 November S Date Kazuo Wakasugi, Commissioner of the Japan Patent Office Display of 141 items Patent application filed on October 18, 1981 (2) 2, Title of invention Copy rItteza-/P 3
3'/d3, Relationship with the case of the person making the amendment Patent Applicant Address: 19 Asahi Tokai Building, 2-6-1 Otemachi, Chiyoda-ku, Tokyo Name: 4th Director, Ushio WLIJlA Co., Ltd. Address: Taito, Tokyo 3-23 Yanaka, Ku-ku@3 No. 5, Subject of amendment (1) Description of claims in the specification (2) Detailed explanation of the invention in the specification 6, Contents of amendment (1) As per separate set (2) ■ Lines 2 to 4 of page 5 of the specification are corrected as follows. ``is a main discharge connected to both ends of the backflow prevention diode and the flash discharge for exposing the original, which are connected in parallel between the output terminals of the charging circuit and the charging circuit. "Diode" in the 10th line from the bottom of the same page, the 9th line from the bottom to the 8th line from the bottom, the 7th line from the bottom of the same page, and the 6th line from the bottom of the same page. "Reverse flow prevention diode" is corrected. ■Correct the 5th line from the bottom of page 6 as follows. A series circuit of [is connected. These backflow prevention diodes D, Dt+ D, D, and K prevent the backflow of the charges charged in the main discharge capacitors C1*C2+c, lC4. W. w, , w, , W4J ■Page 11, lines 11 to 14 are corrected as follows. [The flash discharge lamp lighting circuit includes a backflow prevention diode connected in parallel between the charging path and the output terminal of this charging circuit, and 1) each of the flash discharge lamps for exposing the original written in IJ. and a reconnaissance circuit of main discharge capacitors connected to both ends of the original.
It is equipped with a flash discharge lamp for exposing a document larger than a book, and a flash discharge lamp lighting circuit that turns on all of the discharge lamps for exposing a document larger than a book at the same time to expose the entire surface of the document described in 1'J11 at once. A copy IL characterized by including the flash discharge lamp lighting circuit.

Claims (1)

[Claims] l) At least four original flash discharge lamps arranged to face the original and all of the original exposure discharge lamps such as CN are turned on at the same time to expose the entire surface of the original at once. The flash discharge lamp lighting circuit includes a main discharge capacitor connected to each of the original exposure flash discharge lamps, and a main discharge capacitor for charging these main discharge capacitors. A copying device characterized by including a common charging circuit.