JPS5967787A - Hard copying machine - Google Patents

Abstract

PURPOSE:To attain the hard copy of a still picture of a TV signal to a color ink jet recorder, by providing the 1st buffer memory possible for write in high speed and the 2nd buffer memory accessible in a low speed, and synchronizing the TV signal and the ink jet recorder. CONSTITUTION:Converted C, M, Y signals are coded in response to the level of an input signal with 6-bit A/D converting circuits 3a-3c and stored at each color in the 1st memories 4a-4c. The Y, M, C signals are converted into Y, M, C, BLK dot information by designating the matrix pattern and stored in the 2nd line buffer memories 10a-10d at each color. When the dot information for one line's share is stored, a carriage mounting the Y, M, C, BLK heads (not shown) is run and the print control is attained in response to the content of line buffer. When the printing is finished, the data transfer processing from the 1st line buffer to the 2nd line buffer is attained during the carriage return.

Description

Detailed Description of the Invention Technical Field The present invention relates to a hard copy device that records still images of a TV signal, and more particularly, to a hard copy device that records still images of a TV signal. Concerning the conversion of

When digitizing a conventional TV signal, IH must be sampled at 12.85 MHz in order to have a 1:1 aspect ratio. On the other hand, when a still image of the TV signal is copied by a color inkjet recording device, the excitation frequency of the inkjet recording device is usually about 66 kHz, so synchronization of the TV signal and the inkjet recording device becomes a problem.

Purpose The present invention solves the problems of the prior art as described above, and
This allows a still image of the V signal to be note-copied using a color inkjet recording device.

Embodiment FIGS. 1 and 2 are electrical circuit diagrams for explaining an embodiment of the present invention, in which 1 is a color reproduction circuit, 2 is a color conversion circuit, and 3a to 3C are A/D conversion circuits. circuits, 4a to 4c are buffer memories, 5 is a color separation circuit, 6 is a control circuit,
7a to 7C are intermediate correction circuits, 8 is a matrix selection circuit, 9a to 9d are matrix patterns, 10a to 10
d is a line/clamp memory, 11 is a clock pulse generator, 12 is a frequency dividing circuit, 13 is a pulse-to-sine wave conversion circuit, 14 is an amplifier, 15 is a phase search circuit, 16 is a load circuit, and 17 is a The D/A conversion circuit 18 is an amplifier. In addition, in FIG. 2, the pulse-sine wave conversion circuit 1
3 and amplifier 14 are described only for the BLK head, but the C-Y head also has the same configuration, and the phase search circuit 15 to amplifier 18 are described only for the C charged electrode. It will be readily understood that the configuration is similar for the BLK-M charging electrode.

Next, the operations shown in FIGS. 1 and 2 will be explained.

(1) In this embodiment, one pixel of the TV is expressed as a 4×4 dot matrix on the printer.

(2), the synchronization signal is separated from the TV signal, and the color
91#, R (red), G (green), and B (evening) signals are generated by the decoder circuit 1.

(3) 5 Then, the color conversion circuit 2 converts the RXG%
C (cyan χM(
(magenta) and Y (yellow) signals.

(4) The converted C, M, and Y signals are encoded by the 6-bit Nx conversion circuits 3a to 3C according to the level of the input signal. However, the conversion frequency at this time is 12.
85 MHz.

(5) The above coded signals are stored in the first part (Tsufamemo IJ-4B to 4C) for each color.

(6) The stored contents are read out by a readout signal, and the readout 6-bit x 3 code is subjected to correction in accordance with the matrix characteristics of the inkjet in halftone correction circuits 7a to 7d, and is then converted into a 4-bit code. is converted to the code of

(7), Y, M, and C 4-bit codes are sent to the matrix selection circuit 8. This matrix selection circuit is constituted by a ROM, and is configured to output the address of a predetermined matrix turn using a 4.times.3=1-2 bit address.

That is, predetermined matrix patterns 9a to 9d are selected according to the levels of each of the four bits of Y, M, and C (an example of a single color matrix pattern is shown in the third example).
(shown in figure). A color is expressed by a combination of the selected matrix patterns. For example, if YXM and C are equal in amount, a BLK (black) matrix pattern is selected and black is printed.

(8) The Y, M, and C signals are converted into Y, MXC, and BLK dot information by specifying a matrix pattern, and a second line buffer memory IJ is created for each color.
-10a to 10d are stored for each color.

At this time, the four vertical dots of the 4×4 matrix are stored in parallel in the second line buffer. When this data is stored for 8 lines (as a TV signal), data for 32 dots x 1 line is stored on the second line buffer. The glare frequency of the first line buffer at this time is 16
．． At 5 KHz, the halftone correction circuit and matrix circuit can be driven at low speed, resulting in low cost ROI.

(9) When one line of dot information is stored, Y, M.

A carriage (not shown) carrying C and BLK heads moves, and printing is controlled according to the contents of the line buffer.

(10) During this printing operation, the first line buffer does not contribute to printing, so during this period, the TV signal is A/D converted and the converted data is stored in the first line buffer.

01), when the printing operation is completed, data transfer processing from the first line buffer to the second line buffer is performed during carriage return.

Effects As is clear from the above explanation, according to the present invention, the high-speed line buffer can be configured with 640×8 lines, and the low-speed line buffer can be configured with 2560×32 lines.
It will be cheaper. In addition, since the processing speed from the halftone correction circuit to the matrix circuit is low, the cost is low.

Furthermore, it is possible to reliably synchronize the TV signal and the printer.

Furthermore, since there is no waiting time for the printer, there are advantages such as no reduction in printing speed.

[Brief explanation of the drawing]

1 and 2 are spiral circuit diagrams for explaining an embodiment of the present invention, and FIG. 3 is a diagram showing an example of a matrix pattern. 1... Iromachi raw circuit, 2... Color conversion circuit, 3a to 3c.
・・A/D conversion circuit, 4a to 4c ・Buffer memory,
5... Color separation circuit, 6... Control circuit, 7a~
7c・Halftone correction circuit, 8...Ma) IJ Lux selection circuit, 9a-9d...Matrix pattern generation circuit, 1
0 a to 10 d... Line buffer, 11... Clock pulse oscillator, 12... Frequency divider circuit, 13... Pulse -
Sine wave conversion circuit, 14・Amplifier, 15・Phase search circuit, 16・Charging circuit, 17・D/A conversion circuit, 18・
··amplifier. Patent Applicant Ricoh Co., Ltd. Figure 2 Figure 2 529-43 Continued from Figure 1 Page 0 Inventor Toshiharu Murai Inside Ricoh Co., Ltd., 1-3-6 Nakamagome, Ota-ku, Tokyo Inventor Takao Fukasawa Tokyo Inside Ricoh Co., Ltd., 1-3-6 Nakamagome, Ota-ku, Tokyo

Claims (1)

[Claims] A notebook copying device for recording still images of TV signals has a first buffer memory that can be written at both speeds and a second buffer memory that can be accessed at a low speed. A notebook copying apparatus characterized in that data is transferred from said first buffer memory to a second buffer memory after the printing operation is completed.