JPS609282A - Half tone picture recording device - Google Patents

Abstract

PURPOSE:To record the half tone of a picture with simple control by converting an analog picture data to the signal with plural pulse widths, discriminating its converted output signal, holding it in a tonal data holding means to output a receiving picture in accordance with the output of the means. CONSTITUTION:A received multilevel data is converted to a digital signal of 3-bits by an A/D converting part 10, applied to a switching circuit 11 under the control of a controller 15, and the first data is inputted to even sections 12-0- 12-4 of a shift register 12. In this way, when the first input is ended to the register 12, a selector 14 is controlled by the controller 15, and its output is fetched successively through a switching circuit 13. In this case, when the section 12-0 outputs ''1'' by the selector 14, a current is conducted to a thermal head in an conducting time when the outputs of the respective sections 12-0-12-4 are ''1''. In this way, the half tone of a picture is outputted with the simple control to record the half tone.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a halftone image recording apparatus, and more particularly, to a device capable of recording halftone image output in a facsimile or the like.

(Prior Art and Problems) For example, a conventional facsimile machine capable of outputting a halftone image has an A/D converter l into which received multi-value data is input, as shown in FIG. , a decoder 2 for decoding this, and a memory 3 such as a RAM for recording its output.

The received multivalued data is in the form of analog data indicating the density level of the image, as shown in FIG. 2 (α), for example. In a facsimile device using a thermal print head, the output head is composed of a plurality of output units each having, for example, 32 pits. The multi-value data transmitted from the transmitter is received in the state shown in Fig. 2 (α), for example, and the multi-value data is sequentially υ in the direction of the arrow.
The signal is sent to the Φ converter l. The multivalued data is A/l)
The converter 1 decodes the signal into a 3-pit output, which is then stored in the RAM 3 by the decoder 2 in a state as shown in FIG. 2(b). After the image data is input to the RAM 3, the controller 4 outputs an address signal and inputs the image data to the RAM 3.
Output data sequentially from This data is sequentially and selectively taken out by the selector 5, and the thermal head is controlled accordingly. For example, the data at the density level "4" in Fig. 2 (α) is heated four times by the heater section of the thermal head to record an image with a gradation of "4" (J), and an image with a gradation of r5J. The image data is heated repeatedly five times to record an image with a gradation of "5".

Therefore, in a conventional halftone image recording device as shown in FIG. 1, a RAM that is divided into sections as many as the number of gradations must be provided, and the RAM must be read out sequentially and the output section must be controlled the number of times corresponding to the number of gradations. For example, in the case of eight gradations as shown in FIG. 2 (6), it is necessary to provide eight sections of RAM and control the output head eight times using this RAM. As a result, the RAM capacity becomes large and the control becomes complicated.

(Object of the Invention) In order to improve the above-mentioned drawbacks, the present invention provides a halftone image recording device that can record halftones of multiple images with a small memory capacity and simple control. There is a particular thing.

(Structure of the Invention) In order to achieve the above object, the halftone image recording device of the present invention retains the outputs of a linear Φ converting section that converts analog image data into digital image data, and a conversion section that converts analog image data into digital image data. Regarding a halftone image recording device having a data holding section,
A pulse width converter that converts analog image data into a signal having a plurality of pulse widths, a gradation data holding unit that identifies and holds the output of the pulse width converter, and an output of the gradation data holding unit. The present invention is characterized in that it includes an image output means for outputting a received image in accordance with the received image.

(Embodiment of the Invention) Next, an embodiment of the invention will be described based on FIGS. 3 and 4. FIG. 3 shows the configuration of an embodiment of this invention,
FIG. 4 is an explanatory diagram of the operation.

Before explaining this invention in detail according to the embodiment shown in FIG. 3, an outline of its operation will be explained based on FIG. 4.

In this invention, the energization time of an output head such as a thermal head is controlled. For example, when outputting an image with 8 gradations, the weights as shown in ■ in FIG.
A pulse with a width of 1J, a pulse with a width such as ■ whose weight is "2", and a pulse with a width such as ■ whose weight is "4" are used. When the image output has a weight of rlJ, only pulses with a width of "1" are used as shown in α in FIG. 4(A), and when the weight is "5", similarly (5 ), a pulse with a width of weight rlJ and a pulse with a width of "4" are used. Then, as shown in Figure 4Cb), r:u,rz''
, by selectively combining pulses with a width of "4" and applying them to the thermal head.
Images with halftones of gradation can be recorded. In FIG. 4(b), in order to prevent cooling of the thermal head, a pulse with the minimum width, that is, a pulse with a weight of "1" is brought to the center of the current application time of one recording unit. Pulses with weights of "2" and "4" are placed before and after the minimum width pulse.

Next, an embodiment of the present invention will be described in detail with reference to FIG.

In FIG. 3, 10 is a W converting section that converts received multi-value data into a 3-pit digital signal, 11 is a switching circuit, and 12 is a shift register. 13 is a switching circuit, 14
is a selector, and 15 is a controller. N-conversion unit 1
0 corresponds to the width conversion unit 1 in FIG.
Convert multivalued data to 3-bit digital ν data.

In this example, the shift register 12 is divided into six sections from 12-0 to 12-5"1 as shown in FIG. 3<b>, but it is only necessary to have at least three sections. In the case of (b), 12-0 and 12-1 are areas with weight “1”, 12
-2 and 12-3 are areas with weight "2", 12-4 and 12-
5 is an area with a weight of "4".

The first data output from the Φ converter 10 is transferred to the even number section 12-0 of the shift register 12 by the switching circuit 11.
．． 12-2. Input to 12-4.

In this case, the data of the lightest weight rlJ output from the Φ conversion unit 10 is input to 12-0, and the weight
" data is input to 12-2, and data with weight "4" is input to 12-4.

Therefore, when the input data comes in the state shown in Figure 2 (α), the first data is "0", so it is classified into category 12-
0.12-2.12-4 are respectively filled with 0, 0°0, and the data of the second density level "2" is written with 0 in 12-0 with weight rlJ and 0 with weight "2". '12-
1 is written in 2, and 0 is written in 12-4, where the weight is "4". In the case of the data of density level "5", as shown in FIG. 3(b), 1 is set for 12=0, and 1 is set for 12
0 is written in 2 and l is written in 12-4. Similarly, the data of the first section --a will be input to areas 12-0, 12-2, and 12-4 of the shift register 12.

In this manner, when the first input of image data is completed, the controller 15 controls the selector 14 to sequentially take out the outputs via the switching circuit 13. When the selector 14 outputs 1 from the 12-00 area, that is, the area where the weight is "1", the selector 14 selects (1) in FIG. 4(b).
), and when 1 is output from the area 12-2, the current is controlled to the state shown in (2) of Cb) in Figure 4, and the area When 1 is output from 12-4, (
4) A current having a pulse width as shown in FIG. 4 is controlled to flow to the output head of the thermal printer.

Accordingly, when density level data of an image such as that shown in FIG. 2 (α) is input, an image output having a corresponding halftone can be obtained. In FIG. 3(b), the area 12-0.12-2 of the shift register 12
．． While the output is being taken from 12-4, the next data will now be input into the odd areas 12-1, 12-3, and 12-5. When one group's worth of data has been output, data is subsequently extracted from 12-1, 12-3, and 12-5. This time, 12-0, 12-
2, data will be input to 12-4. In this way, data is continuously input and output, the head of the thermal printer is continuously controlled, and an image having halftones is recorded. At this time, to prevent the head from cooling,
The output of "weight 1-1" is shown in Figure 4 (A) (1) (6)
It is desirable to be in the middle, as in

In the above embodiment, the width of the pulses applied to the thermal head is weighted as 1:2:4, and an 8-gradation image is recorded by combining pulses with three different widths.
For practical purposes, eight gradations are sufficient. However, it is of course possible to record images with even more gradations by weighting the pulse widths other than those described above and combining pulses having such widths.

(Effects of the Invention) Therefore, according to the present invention, since only three memory areas are required in principle, a memory with a small capacity can be used, and the circuit configuration is extremely simple and control is easy. Naru 0

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional halftone image recording device, and Figure 2 (
α) is an explanatory diagram showing the multivalued data received by the halftone image recording device, and FIG. 2(b) is an explanatory diagram showing the state in which the multivalued data is converted into digital data and recorded in the RAM of FIG. 1. , FIG. 3(α) is a block diagram showing an embodiment of the halftone image recording device of the present invention, and FIG. An explanatory diagram showing the state recorded in the shift register of α), FIG.
α) is a basic operation explanatory diagram showing a state in which pulse widths are weighted, and Figure 4Cb) shows that it is possible to record half-tone images by combining various pulses with different widths. FIG. 3 is an explanatory diagram of the operation of the invention. In the figure, 1 is a Φ converter, 2 is a decoder, and 3 is a RAM. 4 is a controller, 5 is a selector, 10 is a Φ conversion unit,
11 is a switching circuit, 12 is a shift register, 13 is a switching circuit, 14 is a selector, and 15 is a controller. Patent applicant Fujitsu Ltd. agent Patent attorney Akira Yamatani Akira Sakae t l m 2 M (1) -・ 043QO52'0 (b) f 3 Figure C mountain) (b)

Claims (1)

[Claims] In an intermediate frame image recording device that has a linear Φ converting section that converts analog image data into digital image data and a data holding section that holds the output of the linear converting section, analog image data is converted into a signal having a plurality of pulse widths. a pulse width converter for converting the pulse width into a pulse width converter, a gradation data holding unit for identifying and holding the output of the pulse width converting unit, and an image outputting unit for outputting a received image in accordance with the output of the gradation data holding unit. A halftone image recording device characterized by: