JPS6118286A - Printer - Google Patents

Abstract

PURPOSE:To attain economy by expanding a data stored in one frame period twice and impressing the data for 4 lines' share so as to speed up the print of a full color picture. CONSTITUTION:R, G, B three primary colors are reproduced from a video signal 1 by a 3 primary color demodulation circuit 2, and a selector switch 5 selects one color. S/H circuits 6, 7 hold consecutive two points of horizontal scanning and a binary-coding processing control circuit 4 generates a sampling point. Two points are digitized by an A/D converter 8 at one horizontal scanning period, transferred to RAM10, 11 and the address control is executed by a gradation data processing control circuit 9. In writing a data in the RAM10 for continuous impression, the data is read from the RAM11 and executed in parallel. The operation is executed alternately by the two RAM10, 11, both the data are doubled at impression and impressed as the data for four points' share.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an electrically conductive thermal transfer printer device for multi-gradation printing which receives a video signal as input and is equipped with a line head.

<Prior art> Conventionally, printing devices for video input signals capable of multi-gradation expression have either performed high-speed analog-to-digital conversion in the horizontal scanning direction and then printed the image, or converted the image one point at a time in the vertical direction.・The most common method is to convert the image digitally and then print it.

Horizontal A/D conversion requires a high-speed A/D converter, and when transferring data to memory, processing such as plate conversion is required to match the writing speed of general memory. This means that high prices will be enshrined. On the other hand, in vertical single point sampling.

- Rai: y515me (for NTSO) and high-speed printing is not possible.

<Purpose> The present invention takes advantage of the relevance of electrical thermal transfer printers,
This paper proposes a system that enables economical, high-speed, full-color printing using video signal input.

<Characteristics> The feature of the present invention is that in full-color print printing without frame memory that uses a video signal as input, Q, horizontal scanning, and
The digital data obtained by sampling two consecutive timing points of is transferred to the printing line memory for the number of lines in the vertical direction.
The % mark is to expand twice and print 4 lines.

<Example> The present invention will now be described in detail according to illustrated embodiments.

FIG. 1 shows an embodiment of the present invention, where 1 is a video signal, 2 is a video signal, and 2 is a video signal.
are five primary color demodulation circuits, 5 is a synchronization processing section, 4 is a binarization processing control circuit section, 5 is a selection switch, 6.7 is a sampling-hold circuit section, 8 is an A/D converter, 9 is a memory and gradation Data processing control section, 10.1
1 is a random access memory (hereinafter referred to as RAM), 12 is a shift register and launch, and 15 is a line head driver.

In this operation, the 5 primary color demodulation circuit 2 reproduces the 6 primary colors of R, G, and B from the video signal 1, and all - colors are selected using the selection switch 5. In the S/H circuit of 6.7, two consecutive points of secular scanning are held at 6 and 7. The sampling points are generated by the 4 binarization processing control circuit section.

-Horizontal scanning period (655 μs for NTSO)
Then, the above two points are digitized by the A/D converter 8 and transferred to the RAM 10 and 11.

Address control of the RAM is performed by the memory 9 and the gradation data processing control section. 10 RAMPs for continuous printing. 'When writing all data, 11
A parallel operation is performed in which data is read from the RAM. −
One side a during the field period (N8 C1/160 type)
Load the field data into the RAM, - frame period 1 = 1 (1150 type in NT'SO), read the data sound from the RAM on the opposite side, and print. This operation is performed alternately on the two RAMs. Sampling is performed at two points during the -horizontal scanning period, and printing is performed by doubling both data by seven to print data for four points. In other words, when printing with a vertical line head, 4 lines are printed at -7
- The image will be printed using a frame (NTsc115oseC). Furthermore, in the vertical direction as well, - field data is expanded to the amount of primary field data.

Since the configuration is like this, -vertical line is 17
It was possible to print in a time of 11JI/4 in the first period, and without using a υ1-speed A/D converter, speeding up was the priority, and since the frame memory was 1'I, it could be applied to video printers. can.

FIG. 2 is a diagram showing the state of screen sampling and the state of printing. In (a), the sampling width when sampling in the vertical direction is 1° 2.5, 4, 5,
6, 7, 8... Sampling in the vertical direction, two points per horizontal line, in the order of 7. (b) shows a state in which the sampling point in (a) is enlarged by 64 times.

Effect> As explained above, in a printing device that inputs a video signal and does not have a frame memory,
By making the line head direction correspond to the vertical direction, high-speed printing of 4 lines per frame is possible without using a high-speed A/D converter.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an explanation of the sampling method and printing method of the present invention. 1...Video signal, 2...5 primary color demodulation circuit, 5
...Synchronization processing unit, 4...Binarization processing circuit, 5
...Selection switch, 6.7...Sampling hold circuit, 8...A/D converter, ?・
...Control circuit, 10,11...RAM or more

Claims (1)

[Claims] A demodulation circuit that reproduces the three primary colors from a video signal, an A/D converter that binarizes the signal, a binarization processing control circuit, and two sets of memories that store line data for printing. It is equipped with a control circuit for memory processing and gradation expression, and a printing head, and prints digital data obtained by sampling two successive timing points of a horizontal scan for the number of vertical lines within one field period of a video signal. A printer device that transfers data to a line memory for printing, doubles the stored data within one frame period, and prints four lines.