JPS6318380B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compact and economical facsimile device for both transmitting and receiving purposes.

Conventionally, as shown in FIG. 1, a cross-section of the facsimile device is shown in a facsimile device for both transmitting and receiving functions. It also consisted of a receiving section consisting of a roll of thermal recording paper 7, a thermal head 8, a driving circuit 9 for the head, and the like. In order to read the transmitted document 2 in the transmitting section, the transmitted document is illuminated by a light source, the reflected light from the transmitted document is reflected by a mirror 3, and then the image sensor 5 is sent by a lens 4.
The photoelectric conversion is performed in a time-series manner by controlling the drive circuit 6, and the receiver guides the preprocessed reception signal to the thermal head 8.
A drive pulse from a drive circuit 9 controls the heat-sensitive head 8 to assemble a signal train similar to the transmitted signal, and heat-sensitive recording is performed on a roll of heat-sensitive recording paper 7.

Next, FIGS. 2 and 3 show circuit examples of an image sensor and a thermal head used in the transmitting section and receiving section of the facsimile machine for transmitting and receiving functions.

Figure 2 shows an example of a circuit of a 64-bit MOS image sensor in which a photodiode array for photoelectric conversion and a scanning circuit are integrated.
By supplying a start pulse to 2, shift registers SR ₁ ... SR ₆₄ operate sequentially to generate scanning pulses e ₁ ... e ₆₄ , and MOS switches Q ₁ ...
Drive Q ₆₄ sequentially. When the MOS switch Q ₁ is in the open (OFF) state, the charge in the photodiode D ₁ is discharged in proportion to the amount of incident light, which is reflected light guided from the surface of the transmission document 2 to the image sensor 5. A corresponding pulse is applied to terminals 10, 11, and 12, and MOS switch _Q1 becomes conductive (ON).
In this state, a closed circuit is formed by the DC power source 16, the load resistor 15, and the photodiode _D1 , and at the same time, the closed circuit is formed, and at the same time, the load resistor 15 is connected from the power source 16.
A charging current corresponding to the above-mentioned discharge current flows through the video output terminal 14 and the common terminal 13 at both ends of the load resistor 15, and a signal output corresponding to the transmission original 2 is obtained from the video output terminal 14 and the common terminal 13. Below, photodiode _D2 ...
The same process was repeated for D ₆₄ to obtain each signal output. In this way, the image sensor 5 used in the transmitting section drives the shift register with clock pulses and start pulses having multiple phases, obtains scanning pulses, sequentially turns on the MOS switches, and converts the MOS switches in proportion to the amount of incident light. By charging the photodiode array that has been discharged in advance, an output signal corresponding to the transmitted document is obtained in time series.

FIG. 3 shows an example of a circuit of a 64-bit thermal head 16 in which thermal recording media R ₁ ...R ₆₄ and blocking diodes BD ₁ ...BD ₆₄ for preventing reverse current are arranged in a matrix. A drive circuit consisting of an individual electrode side drive circuit 18, a common electrode side drive circuit 20, and switches _S1 ... _S4 is shown. Of these, the individual electrode side drive circuit 18 is composed of a serial-parallel conversion shift register and a holding circuit, and performs serial-parallel conversion on the time-series recording signal from the input terminal 19 every 16 bits. The common electrode side drive _circuit 20 is composed of _a shift register and sequentially controls the switches _S1 ... _S4 . It generates driving pulses for opening and closing. That is, the circuit operation shown in the figure is as follows: First, the common electrode drive circuit 20 turns on the switch S ₁ , and then the individual electrode drive circuit 18 drives the electrodes C ₁ . . . C ₁₆ . The signal current converted in parallel with the recording signal from the blocking diode BD ₁ ...
... BD ₁₆ , the thermal recording medium R ₁ ...R ₁₆ , the terminal T ₁ and the switch S ₁ , and heat proportional to the current is generated in the thermal recording medium and can be recorded on the thermal recording paper. Next, switch S ₂ connected to terminal T ₂
By turning ON, recording can be made on the thermal recording paper by the current passing through the thermal recording media _R17 ... _R32 . By similarly switching the switch, thermal recording proportional to the current passing through other thermal recording media can be performed.

However, as mentioned above, the image sensor 5 used in the transmitting part of the conventional facsimile machine for sending and receiving is manufactured using integrated technology using Si material, so the chip size is small and the image sensor 5 uses the reflected light from the transmitted original 2 as an image sensor. In order to guide the light to the sensor 5, a condensing lens 4 is required as shown in FIG.
Because one MOS switch was connected to one photodiode, the drive circuit became complicated, and there was a limit to the miniaturization of facsimile devices that could be used for both transmission and reception. In addition, in the case of the above-mentioned facsimile device for transmitting and receiving functions, the image sensor 5 of the transmitting section and the thermal head 8 of the receiving section have completely different structures, and a dedicated drive circuit is required to drive them. This has been a drawback in making the device smaller and more economical.

In order to solve the above-mentioned drawbacks, the present invention has the following points:
To provide a transmitting/receiving facsimile device which has a configuration in which the drive circuit of an image sensor of a transmitting section and a driving circuit of a thermal head of a receiving section can be shared, and can switch between transmission and reception using a switch provided in the device. The drawings will be explained in detail below.

FIG. 4 shows an embodiment of the present invention, in which 17 is a newly formed image sensor, BD' ₁ ...BD' ₆₄
is a blocking diode for reverse current prevention, R′ ₁
...R' ₆₄ is a photoconductive medium made of semiconductor material such as CdS or Se, C' ₁ ... C' ₁₆ is the individual electrode side drive circuit 18
, _T'1 ... _T'4 are terminals of the image sensor, 18' is an individual electrode side drive circuit with a transmission/reception switching function, and 20' is a common electrode that can be shared by the image sensor 17 and the thermal head 16. The side drive circuit and others are the same as the reference numerals in FIGS. 2 and 3.

In the facsimile device for transmitting and receiving functions according to the present invention, the image sensor 17 uses thin film technology, which is a manufacturing technology for thermal heads, and therefore serves as a photoconductive medium for photoelectric conversion, and its resistance changes depending on the amount of incident light.
Using a semiconductor material such as CdS or Se, the material is manufactured by thin film technology such as vapor deposition on a substrate material such as glass or aluminum, and in order to make it possible to share the common side electrode drive circuit 20 of the heat sensitive head 16, the above-mentioned image is used. The circuit configuration of the sensor 17 is the same as that of the thermal head 16, as shown in the figure. Blocking diodes BD' ₁ ...BD' ₆₄ for preventing reverse current are connected to each photoconductive medium R' ₁ ...R' ₆₄ of the image sensor 17, and the photoconductive medium to which the blocking diode is connected One end of each of 16 bits is commonly connected to terminals T' ₁ to T' ₄ . On the other hand, the other end of the photoconductive medium is connected to the electrodes C ₁ ...C ₁₆ from the individual electrode side drive circuit to form a matrix connection. The connection of the thermal head 16 is as described above.
Same as the figure.

The common electrode side drive circuit 20' includes a 4-bit shift register and switches _S1 ... _S4 for the thermal head 16,
It consists of switches _S'1 ... _S'4 for the image sensor 17.

Further, FIG. 5 shows the configuration of the individual electrode side drive circuit 18' which is provided with a transmission/reception switching function. 19 in the same figure
is a recording image signal input terminal, 21 is an internal clock oscillator that generates drive pulses for the image sensor, and 22 is an image sensor 17 and a thermal head 16.
23 is a serial-to-parallel conversion shift register; 24 is a switch circuit that is turned on when the holding circuit 25 is used (that is, when the thermal head 16 is in operation) and turned off when not in use; 25 is a serial-to-parallel conversion switch; A holding circuit 26 stores the image signals and supplies them all at once to the electrodes C ₁ ... C ₁₆ from the individual electrode drive circuit, and is turned ON when the image sensor ₁₇ is operated _. At this time, the switch circuit 24, which supplies the drive pulse, is turned off.

Next, the operation of the transmitting/receiving facsimile device will be explained based on FIGS. 4 and 5.

First, when operating the transmitting section of the device, a drive pulse from the clock oscillator 21 in FIG. Since the switch circuit 24 is turned off and the switch circuit is turned on in advance, the drive pulse supplied to the serial/parallel conversion shift register 23 is directly transmitted to the electrodes C' ₁ . . . C' ₁₆ .

On the other hand, from the common electrode side drive circuit 20, the terminal T' ₁
... _T'4 are supplied with driving pulses for sequentially driving the switches _S'1 ... _S'4 connected to the switches S'1...S'4. That is,
With switch S ₁ closed, electrodes C′ ₁ …C′ ₁₆
When drive pulses from the serial-to-parallel conversion shift register 23 are sequentially applied to the image sensor 17, a current flows through the photoconductive medium R' ₁ ... R' ₁₆ of the image sensor 17, and the photoconductive medium receives the incident light beam reflected from the transmitted document. Since the resistance changes depending on the amount of light, an output signal corresponding to the amount of incident light is taken out from the terminal 11 through the load resistor 13. Next, switch S′ ₁ is opened, and switch S′ ₂ is opened.
is closed, driving pulses are sequentially applied to the electrodes C′ ₁ ...C′ ₁₆ , so that a current flows through the photoconductive medium R′ ₁₇ ...R′ ₃₂ of the image sensor 17, and the load resistor 1
3, an output signal corresponding to the amount of incident light is taken out from the terminal 11. By performing similar operations thereafter, an output signal for one scan corresponding to the amount of incident light can be obtained from the terminal 11.

Next, when operating the receiving section, a recording image signal is applied to the input terminal 19, and the changeover switch 22 is applied.
The signal is led to a serial/parallel converting shift register 23, where it is converted into a parallel signal, and the converted signal passes through a switch circuit 24 and is stored in a holding circuit 25. The 16 bits are then supplied to the electrodes _C1 ... _C16 all at once. On the other hand, from the common electrode side drive circuit 20, as in the case of the transmitting section, the terminal T ₁ ...
A drive pulse is supplied to sequentially drive the switches S ₁ ...S ₄ connected to T ₄ . First, when the switch S ₁ is closed and image signals are supplied to the electrodes C ₁ ... C ₁₆ all at once, the thermal recording medium of the thermal head 16
A current corresponding to the image signal flows through _R1 ... _R16 , and heat corresponding to the current is generated in the thermal recording medium, causing the thermal recording paper to develop color and recording. Next, with switch _S1 open and switch _S2 closed, electrode _C1 ...
When image signals are supplied all at once to _C16 , a current corresponding to the image signal flows through the thermal recording medium _R7 ... _R32 of the thermal head 16, and heat corresponding to the current is generated in the thermal recording medium. Recording is performed by coloring heat-sensitive recording paper. By performing the same operations thereafter, it is possible to perform recording for one scan.

Further, a 1-line memory is added to the output signal output terminals 13 and 14, the output terminal of the memory is connected to the recording image signal input terminal 19, and the output signal from the terminal is temporarily stored in the memory, The output of the memory can also be used as a copying machine by leading the output from the input terminal 19 to the thermal head 16 via the shift register 23 and performing thermal recording.

In addition, in one embodiment of the present invention described above, 64
Although the case of the bit is described above, it is obvious that the present invention is not limited to this and can be expanded depending on the scope of application of the facsimile device for transmitting and receiving functions.

As described in detail above, the image sensor 1 used in the transmitting section of the facsimile machine for transmitting and receiving functions
By using a semiconductor material such as CdS or Se as the photoconductive medium manufactured by thin film technology such as vapor deposition on a substrate such as glass or aluminum, it is possible to collect light in the transmitting section of a conventional facsimile machine for both transmitting and receiving purposes. This eliminates the need for the lens 3, which has the advantage of making the device more compact. Further, since the circuit configuration of the image sensor 17 used in the transmitting section of the device according to the present invention has the same matrix wiring as the circuit configuration of the thermal head 16 of the receiving section, the driving circuit of the image sensor 17 and the thermal head 16 can be can be shared, which has the effect of greatly contributing to miniaturization and economicalization of the device. Furthermore, the sensitivity of CdS used as a photoconductive medium in the image sensor of the present invention is approximately 1000 times higher than the sensitivity of a photodiode, which is a light detection medium of a conventional image sensor, when the light receiving area of the photodiode is the same. Therefore, there is an advantage that the performance of the device can be greatly improved.

Furthermore, by using a thermal recording medium with a small rise time constant in the thermal head, it is possible to record bit by bit without having to record all at once using the holding circuit as described above, thereby eliminating the need for a holding circuit in the drive circuit. , the device can be further simplified.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional facsimile device for both transmitting and receiving functions, Fig. 2 is an example of a circuit of an image sensor used in the transmitting section of a conventional facsimile device for transmitting and receiving functions, and Fig. 3 is a circuit diagram of an image sensor used in the receiving section of the device. FIG. 4 shows an example of a circuit of a heat-sensitive head according to the present invention, and FIG.
This figure is a configuration diagram of an individual electrode side drive circuit to which the transmitting/receiving switching function of FIG. 4 is added. 1...Light source, 2...Transmission original, 3...Mirror,
4... Lens, 5... Image sensor, 6... Drive circuit for image sensor, 7... Roll of thermal recording paper, 8... Thermal head, 9... Drive circuit for thermal head, 16... Thermal head An example of a circuit, 17
...One circuit example of an image sensor, 18'...Individual electrode side drive circuit with added transmission/reception switching function, 19
... Recording image signal input terminal, 20'... Common electrode side drive circuit, 22... Changeover switch, 23... Series/parallel shift register, 24, 26... Switch circuit, D... Photodiode, T, T' ...terminal,
S, S'...Switch, R...Thermal recording medium, R'...
Photoconductive medium.

Claims (1)

[Claims] 1. A facsimile device for transmitting/receiving, consisting of a transmitting section using an image sensor and a receiving section using a thermal head, including a switch for alternately switching between the transmitting section and the receiving section, and for driving the thermal head. In order to drive the image sensor of the transmitting section by the drive circuit of
A facsimile device for transmitting and receiving functions, characterized in that it has a matrix circuit configuration that is the same as the circuit configuration of the thermal head.