JPS5948588B2 - Facsimile reading/recording method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reading and recording calligraphy information and an apparatus thereof, which can constitute a small, simple, and economical facsimile machine.

Conventionally, a facsimile machine having transmitting and receiving functions is configured as shown in FIG.

In the figure, 1 is a light source such as a fluorescent lamp, 2 is a transmission original, 3 is a mirror, 4 is a lens, 5 is a transmission image sensor for reading calligraphic information of the transmission original and obtaining a transmission image signal.
6 is an image sensor drive circuit, 7 is a thermal recording paper, 8 is a reception thermal head that records calligraphy information on the thermal recording paper according to the received image signal, 9 is a thermal head drive circuit, and in the transmission system, the light source 1 illuminates the transmission document 2 and guides the reflected light to the image sensor 5 via the mirror 3 and lens 4 for photoelectric conversion to obtain a transmission image signal. 8 to record calligraphy information on the thermal recording paper 7. FIG. 2 shows an equivalent circuit of a typical conventional 64-bit image sensor. In the figure, 10 and 11 are clock pulse input terminals, 12 is a start pulse input terminal,
13 is a ground terminal, 14 is an output terminal, 15 is a load resistance,
16 is a power supply, 5R1 to 5R64 are shift registers, D1
~064 are photodiodes, Q1~Q64 are switching transistors, e1~e64 are scanning pulses, and now when two-phase clock pulses are input to input terminals 10 and 11 and a start pulse is input to input terminal 12, shift registers 5R1~ Scanning pulse e1 at each stage of 5R64
-e64 are sequentially shifted and output, switching transistors Q1-Q64 are turned on sequentially, and photoelectric conversion signals detected by photodiodes D1-D64 are taken out from output terminal 14 through load resistor 15.

Further, FIG. 3 shows an equivalent circuit of a conventional 64-bit thermal head, and a block designated by reference numeral 17 in the figure corresponds to the thermal head 8. In FIG.

18 is an individual side electrode drive circuit, 19 is an input terminal for a received image signal, 20 is a common side electrode drive circuit, C1 to C, 6 is an individual side electrode, T1 to T4 are common side electrodes, 51 to 54 are switches, R1 ~R64 is a thermal resistance element, BD1~BD64 are leakage current blocking diodes, and individual side electrodes C1~C16
Image signals are sequentially applied from the drive circuit 18 to the common side electrode T1.
By sequentially turning on the switches S1 to S4 of -T4 by the drive circuit 20, the thermal resistance elements R and -R64 sequentially generate heat so that recording can be performed in accordance with the image signal.

In this way, in conventional facsimile devices, the image sensor in the transmitting system and the thermal head in the receiving system are constructed completely separately, each with different driving means, resulting in a complex and large device configuration and increased cost. There were disadvantages such as being economically disadvantageous as a result of this.

In view of the above-mentioned drawbacks of the conventional devices, the present invention has been developed to drive the image sensor of the transmitting system and the thermal head of the receiving system by a common driving means, thereby making it possible to read and record graphic information. Its purpose is to make facsimile equipment simpler, more compact, and more economical.

The invention will now be explained in detail with reference to the drawings. 4 to 7 show one embodiment of the present invention, and FIG.
FIG. 2 is an electrical circuit diagram used in a reading/recording method using a bit thermal head and an image sensor.

In the figure, R1 to R64 are thermal resistance elements arranged in a row,
The resistance value of each is about 300 to 800Ω, for example, Ta-
It is formed from N or the like. D S and S64 are photoconductive elements arranged in a line, and the resistance value of each is several MΩ when exposed to light, and several tens of MΩ to several hundred MΩ when not illuminated. For example, CdS, CdSe, etc. Formed by etc. Further, T1 to T64 are switching transistors. The thermal resistance elements R1 to R64 are connected in series to the photoconductive elements S1 to S64, respectively, and the collectors of the switching transistors T1 to T64 are connected to the midpoints between the thermal resistance elements R1 to R64 and the photoconductive elements S1 to S64, Its emitter is grounded, and its base 5 is connected to a drive pulse generation circuit to be described later. One ends of the thermal resistance elements R1 to R64 are connected to the emitters of the common side switching transistors C1 and C2 in groups of 32 each. The collectors of the switching transistors C1 and C2 are commonly connected to a power supply c via a four-power changeover switch SW1. Note that Rs is a protective resistor for the image sensor. 23 is a 1 drive pulse generation circuit for operating the common side switching transistors C1 and C2; 2;
4 is a timing signal input terminal, 25-1 and 25-2 are driving pulse generation circuits for switching transistors T1 to T64, and 26 is an input terminal for an image signal (in the case of a thermal head) or a driving pulse (in the case of an image sensor). It is.

Note that the power source (c) is usually selected to be about 10 to 20V. Next, the operation will be explained.

First, in the case of recording using a thermal head, switch SW1
When the transistor C is turned to the terminal 21 side and a signal is input from the timing signal input terminal 24, a pulse is generated from the 1 drive pulse generation circuit 23 and the switching transistor C is turned on.
With the switching transistor C1 in the on state, pulses are sequentially generated from the drive pulse generation circuit 25-1 in response to the image signal from the timing signal input terminal 26, turning on the switching transistors T1 to T32 one after another. For example, if the switching transistor T1 is black, the power supply V
A closed circuit is formed: c→terminal 21→switching transistor C1→thermal resistance element R1→switching transistor T1→earth, thermal resistance element R1 generates heat, and recording is performed. 1 if switching transistor T2 is white
Since no pulse is generated by the drive pulse generating circuit 25-1, the switching transistor T2 remains off.
In this case, a closed circuit is created: power supply Vc → terminal 21 → switching transistor C1 → thermal resistance element R2 → photoconductive element S2 → load resistor 27 → ground, but photoconductive element S2 is connected to several MΩ and thermal resistance element R2 Since it has a very high resistance compared to R2, almost no current flows and the thermal resistance element R2 does not generate heat at all. In this way, the switching transistors T1~
Recording is performed by sequentially turning T32 on or off.

In the case of the switching transistor C2, the switching transistors T33 to T64 are similarly turned on and off. In this case, the switching transistors T1 to T64 are switched at high speed, and their on states are temporarily stored (
By latching), parallel application of any number of bits is possible and high-speed recording is possible. Next, the operation of the image sensor will be explained.

When the switch SW1 is turned to the terminal 22 side and a signal is input from the timing signal input terminal 24, a pulse is generated from the 1 drive pulse generation circuit 23 and the switching transistor C1
Turn on. Contrary to the thermal head case, switching transistor T1 is turned off, and switching transistors T2 to T32 remain on. In this way, the power
c→protective resistor Rs→terminal 22→switching transistor C1→thermal resistance element R1→photoconductive element S1→load resistor 2
A closed circuit from 7 to ground is formed, and a photocurrent corresponding to the resistance of the photoconductive element S1 flows to the load resistor 27 and is read. In this case, the thermal resistance element R has a much smaller resistance value than the photoconductive element S1 and can be ignored. Further, an on-current flows through the switching transistors T2 to T32, but if the protective resistor Rs is selected to be several tens of kilohms, the power is very small. By the way, in such a circuit, the following wrap-around current occurs. That is, power supply ■c → protection resistor Rs → terminal 22 → switching transistor C1 → thermal resistance element R1
This is because there is a leakage current in the direction of → photoconductive element S1 → photoconductive element S2 → ground. Similarly, since the switching transistors T3 to T32 are also on, there is a leakage current. Therefore, equivalently, 31 photoconductive elements are connected in parallel with the load resistor 27. Therefore, the resistance of the load resistor 27 must be selected to be (load resistance)<<-(white) resistance of the photoconductive element in the case of 32 originals).

For example, in the case of a white original, the resistance of the photoconductive element is several MΩ, so the load resistance is selected to be about several KΩ. Fifth
The figures and FIG. 6 show a specific example of a reading/recording device used in the method of the present invention.

In this figure, only two thermal resistance elements and a photoconductive element are shown to simplify the drawing. In the figure, reference numeral 29 denotes a glass substrate on which photoconductive elements S1 and S2 are formed with a predetermined gap between them, and a common electrode 30 is provided at one end of the glass substrate, and individual electrodes 31-1 and 312 are provided at each other end. It is formed. Reference numeral 32 denotes a ceramic substrate adjacent to the glass substrate 29, on which thermal resistance elements R1 and R2 are formed with the same gap as the photoconductive elements S1 and S2, and individual electrodes 33-1 and 33 are formed at one end of the ceramic substrate. -2 and an individual electrode 3 at the other end.
4-1 and 34-2 are formed.

35 is an IC chip.

This includes the switching transistors T1 to T32 and drive pulse generation circuits 25-1 to 25-2 of the circuit shown in FIG.
5-2 is built-in. Terminal 35a of IC chip 35
are contacts 36, 37 and electrodes 31-1, 31-2, 34-1
, 342. By configuring as described above, the reading/recording device can be made very simple and compact. Note that the thermal resistance elements R1 and R2 may be formed on a glass substrate, and in this case, the photoconductive elements S, , S2
Since it is integrated with the board, the configuration becomes simpler.
Furthermore, it goes without saying that the common side switching transistors C, , C2 and the drive pulse generating circuit 23 shown in FIG. 4 can be easily constructed using IC chips. FIG. 7 is a schematic diagram of the above-mentioned reading/recording device incorporated into a photoconductive device, in which a photoconductive element S on a glass substrate 29 is shown.
1 and the thermal resistance element R on the ceramic substrate 32 are installed as shown in the figure.

2 is a transmission document sent in the direction of the arrow; 40 is a light source; 41 is an imaging element such as a focusing optical fiber; 42 is a feed roller;
3 is thermal recording paper.

This operation is as follows. When the transmission original 2 is sent in the direction of the arrow, the transmission original 2 is illuminated by the light source 40, and the reflected light is imaged on the photoconductive element S1 using the imaging element 41 and photoelectrically converted. On the receiving side, when the recording paper 43 is fed by the roller 42, recording is performed by the heat generated by the thermal resistance element R1.
Note that the single drive of the photoconductive element and the thermal resistance element is as described above. When used as a copy machine, it is sufficient to prepare a one-line memory, read one line, store it for one time, read it out, and record it, repeating the operation. As explained above, according to the present invention, there is provided a method for reading and recording a facsimile having a transmitting image sensor comprising a plurality of photoconductive elements and a receiving thermal head comprising a plurality of thermal resistance elements. One set of photoconductive elements is connected in series, a switching element is connected in parallel to each photoconductive element, and the switching elements are sequentially made conductive to select five thermal resistance elements for recording and opening. Since the photoconductive element is selected for reading, it is possible to perform reading and recording by the transmitting image sensor and the receiving thermal head using a common driving means, instead of the conventional individual driving/Operating device. Since there is no need to provide any means, it greatly contributes to the simplification, miniaturization, and economicalization of facsimile machines.

Further, in a facsimile reading/recording device having a transmitting image sensor consisting of a plurality of photoconductive elements and a receiving thermal head consisting of a plurality of thermal resistance elements, one pair of the thermal resistance elements and one photoconductive element are connected in series. By arranging the photoconductive elements and connecting them to each other in a line horizontally, and connecting a switching element in parallel to each photoconductive element, the reading/recording section becomes extremely compact, making it possible to easily and compactly create a facsimile machine that can be used as a facsimile transmitter/receiver. It has the advantage of being able to be configured at a low cost.

[Brief explanation of drawings]

The drawings are provided to explain the present invention. Fig. 1 is a schematic diagram of a conventional facsimile device, Fig. 2 is an equivalent circuit diagram of a conventional 64-bit image sensor, and Fig. 3 is an equivalent circuit diagram of a conventional 64-bit image sensor.
4 is an electric circuit diagram of a reading/recording device showing an embodiment of the present invention; FIG. 5 is an enlarged plan view of essential parts showing a specific example of the reading/recording device; 6 is a cross-sectional view taken along the line ■--■ in FIG. 5, and FIG. 7 is a schematic diagram of a facsimile apparatus incorporating the reading/recording device according to the present invention. R1-R64...Thermal resistance element, S1-S64.
...Photoconductive element, T1 to T64...Switching transistor.

Claims (1)

[Scope of Claims] 1. A facsimile reading/recording method having a transmitting image sensor comprising a plurality of photoconductive elements and a receiving thermal head comprising a plurality of thermal resistance elements; A pair of thermal resistance elements are connected in series, and a switching element is connected in parallel to each photoconductive element. By sequentially turning on the switching elements, a thermal resistance element is selected and recording is performed, and by opening it, the photoconductive element is activated. A facsimile reading/recording method characterized in that reading is performed selectively. 2. In a facsimile reading/recording device having a transmitting image sensor consisting of a plurality of photoconductive elements and a receiving thermal head consisting of a plurality of thermal resistance elements, each pair of the thermal resistance element and the photoconductive element are arranged in series. A facsimile reading/recording device characterized in that photoconductive elements connected to each other are arranged in a row in the horizontal direction, and a switching element is connected in parallel to each photoconductive element.