JPS5912670A - Facsimile device - Google Patents

Abstract

PURPOSE:To eliminate the need for a speed converting memory such as RAM, to simplify the circuit constitution, and to control the transmission speed of a picture signal, by using a shift register mounted on a reception recording head in common for a picture signal holding memory at the transmission of a picture signal. CONSTITUTION:A transmission picture signal Stp outputted from a CCD unit 11 and a receiving picture signal Srp from a modulation and demodulation circuit 14 are selected at a selector 12 and applied to a shift register 15 mounted on a thermal head through the transmission or receiving by a selection signal Ss from a control section 16. The register 15 is used in common as a memory of picture signal holding at the transmission of picture signal, a shift clock Cs is applied from the control section 16 to the register 15, a picture signal for one line's share is written in the register 15 in order and the outputted picture signal Stp is applied to a mixing circuit 13. Further, the clock Cs is made coincident with the picture signal transfer speed of the CCD 11, the speed conversion memory such as RAM is eliminated for the need and the circuit constitution is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Description of the technical field to which the invention pertains The present invention relates to a facsimile device, and in particular, to a facsimile device that can be used for both sending and receiving purposes. Figure 1 shows the functional configuration of the image signal transmitting and receiving part of a conventional facsimile machine that uses a thermal head for both sending and receiving functions. This is a CCD unit that includes a D converter and the like. 2 is a transmission image signal Sep.

A memory for temporarily holding the received image signal srp, 3
is a mixing circuit for sending the phase signal SPA to the modulation/demodulation circuit in pAasgB of the facsimile transmission procedure, and for inserting the phase signal into the image signal in pAasgC. Reference numeral 4 denotes a modulation/demodulation circuit consisting of a modulation section for signals sent to the line and a demodulation section for signals received from the line. 5 is a shift register mounted on the thermal head for holding received image information, and 6 is a control unit that controls the entire diversion.

Generally, in a facsimile machine with such a configuration, C
When the image signal stp read by the CD is sent to the line one bit at a time, the image signal Sep read from the CCD
The speed is faster than the transfer speed to the line. Therefore, the image signal Stp read out from the CCD unit 1 is temporarily held in the memory 2, and speed conversion is performed by reading out the image signal from the memory in accordance with the transfer speed to the line.

As described above, the conventional system has the drawback of requiring an additional circuit such as a RAM capable of storing at least one line of image signals in order to control the sending speed of the image signals.

(3) Detailed Description of the Invention The present invention has been made to eliminate the above-mentioned drawbacks of the conventional technology. Therefore, an object of the present invention is to eliminate the additional circuits such as the RAM, and to realize an image display with a simple circuit configuration. An object of the present invention is to provide a new facsimile machine that can realize a signal transmission speed control section.

(4) Structure of the Invention In order to achieve the above object, a factor hash device according to the present invention is provided in a facsimile machine having a memory for holding recorded image information mounted on a receiving recording head. a selector for selecting either the transmitted image signal or the received image signal output from the modulation/demodulation circuit; and a selector for making the transmitted image signal match the image signal transfer rate of the CCD unit when the output of the selector is the transmitted image signal. 1
The transmission image signal is transferred to the memory at a clock of and means for transferring a signal to the memory using the fM2 clock, and the memory is used as a memory for holding transmission image information during transmission, and is also used as a memory for holding image information for transmission and reception.

(5) Detailed Description of the Invention Next, a preferred embodiment of the present invention will be specifically described with reference to FIGS. 2 and 3.

@2 Figure is a block configuration diagram showing an embodiment of the present invention. In FIG. 2, reference numbers 11.13.14°15.
1 to 1 respectively show a CCD unit, a mixing circuit, a modulation/demodulation circuit, a shift register of a thermal head, and a control section corresponding to reference numbers 1, 3, 4, 5, and 6 in FIG.

The 12 selectors are used to switch data to be shifted into the shift register 15 by transmission/reception using a select signal S8.

With this configuration, the shift register 15 can also be used as a memory for controlling the transmission speed of the transmission image signal Stp, as described above. That is, at the time of transmission, the 4% binary image read out from the CCD unit 11 is transferred to the shift register 15 of the thermal head at the image signal transfer rate of the CCD.
The image signal is sequentially shifted and input one line at a time, starting from the first bit. This image signal 5tj) shift register 15
Transfer to shift register 1 at CCDQ image signal transfer rate
This can be easily realized by matching the periods of the shift clocks C8 of No. 5. This transfer is a facsimile transmission procedure p.
It is dominant during the γ-phase interval of AaagC. When the phase period ends, by matching the period of the shift clock C8 of the shift register 15 with the transmission speed of the image signal to the line, the shift register 15 sends out the image signal one pit at a time to the line, starting from the first bit. Ru.

When the image signal is received, the image signal Srp is 9, and the cycle of the shift clock of the shift register 15 is sent from the line to 1.
The image signal Srp is shifted into the shift register 15 one pit at a time, and printing is started when the transfer of one line is completed.

FIG. 3 shows a timing chart in phase C on the transmitting side and the receiving side when communicating between the devices having the configuration shown in FIG. 2. (a) is a timing chart of the transmitting side, and (b) is a timing chart of the receiving side. The H level of the transmission phase S'pA and the reception phase S''ph indicates the phase interval, and 08' is the shift clock supplied to the shift register of the thermal head on the transmission side, and C8
'' is a shift clock supplied to the shift register of the thermal head on the receiving side. In the figure, the number of pixels for one line in the main scanning direction is fixed to n (1 rlk pixel is shifted by a shift pulse of 1 ft61).

On the transmitting side, during the phase interval the shift clock #C/s1
% image signals transferred from the CCD unit 11 to the shift register 15 using a high-speed shift pulse such as is sent out one bit at a time to the line.

On the other hand, on the receiving side, the effective part of the binary demodulated output of the modulation/demodulation circuit 14 (the demodulated output excluding the phase part)
is shifted into the shift register 15 one line at a time by the shift clock group σ'&3. In this case, the period of the shift clock group Cl1l+3 is the shift clock p
It is equal to the period of C'82. When the shift input for one line is completed, the data on the shift register is launched and held, and printing is executed simultaneously while the image signal of the next line is shifted and input to the shift register.

(5) Detailed Description of the Invention As described above, by using the shift register mounted on the receiving recording head as a memory for holding image signals when transmitting image signals, the speed of RAM etc. can be increased compared to conventional circuits. No memory for conversion is required, and the p1 circuit configuration becomes simple. Furthermore, since the sending speeds of both signals can be controlled simply by controlling the cycle of the shift clock of the shift register, the configuration of the control section can also be simplified.

[Brief explanation of the drawing]

Figure 1 shows a CCD image sensor in the image signal reading section.
A functional configuration diagram of a conventional sending/receiving type facsimile machine that uses a thermal head in the recording section. Fig. 2 is a block diagram showing an embodiment of the present invention. Fig. 3 is a transmission diagram based on the embodiment of Fig. 2. FIG. 4 is a timing chart of shift clocks on the receiving side and the receiving side. FIG. 1, 11. , , CCD unit, 200. memory, 3
．． 13. ,. Mixed circuit, 4.14. ,,modulation/demodulation circuit, 5.15. ,,
Thermal head shift register, 6.16. ,,control unit,5ep00. Transmission image signal, Sr7no01. Received image signal, 871h, , Phase signal, S'ph, , Transmission phase, S″ph, , Reception phase, SL-*Select signal, C
m, , Shift clock, C'8e** Shift clock supplied to the thermal head on the transmitting side, C"L+e Shift clock supplied to the thermal head on the receiving side, 3.
2. ,, Kuta Patent Applicant NEC Co., Ltd. Agent Patent Attorney Yutabe Kumagai% Chief Cabinet Secretary Kazuo Wakasugi Tono 1 Indication of Case 1981 Special Request No. 121705 2 Name of Invention Facsimile Machine u 3 Relationship with the case of the person making the amendment Patent Applicant Residence R-Chome 5-33-1 Shiba, Minato-ku, Tokyo Name (4)
23) Tadashi Sekimoto, Representative of Nippon'Kameki Co., Ltd.
Hiro 4th Osamu Address KuriyA2215-22711a, Zama City, Kanagawa Prefecture
Tani Patent Office 1, page 7 of the specification, line 19, 1 (5) Detailed explanation of the invention is corrected to ``(6) Theory of the effects of the invention.

Claims (1)

[Claims] In a facsimile machine having a memory for holding recorded image information mounted on a reception recording head, a selector for selecting either a transmission image signal output from a CCD unit or a reception image signal output from a modulation/demodulation circuit; When the output of C is a transmission image signal, the transmission image signal is
Transferring the image signal to the memory using a first clock that matches the image signal transfer speed of the CD unit, and sending the image signal from the memory to the line using a second clock that matches the image signal sending speed of the line. , means for transferring the multiplied signal to the memory using the second clock when the output of the selector is a received signal, and 1iiJ memory is used as a memory for holding transmission image information at the time of transmission. A facsimile device that is characterized in that it doubles as a memory for holding image information for transmission and reception.