JPH02297461A - Recording control method for solid-state scanning recording heads - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a recording control system for an array-shaped solid state scanning recording head in which a plurality of light emitting elements such as light emitting diodes (LEDs) and phosphor dot arrays are arranged. be.

(Prior Art) In a printer that records images using an array-like solid-state scanning recording head in which a plurality of light-emitting elements such as light-emitting diodes and phosphor dot arrays are arranged, a certain amount of effective recording is performed except at both ends of the recording head. When only the area is used, the light emitting elements in the effective recording area deteriorate as the usage time progresses, while the light emitting elements at both ends outside the effective recording area do not deteriorate.

(Problems to be Solved by the Invention) Therefore, the light emitting elements in the effective recording area deteriorate over time, although the light emitting elements at both ends do not deteriorate. However, since feedback control of the amount of light is performed using some of the light emitting elements at both ends, the deterioration of the light emitting elements at both ends and the light emitting element in the effective recording area must be the same.

An object of the present invention is to prevent the above-mentioned disparity in deterioration between the effective recording area and both ends as time passes.

(Structure and operation) The present invention detects each pattern on the recording paper when recording an image using an array-shaped solid-state scanning recording head in which a plurality of light emitting elements are arranged, and detects a certain pattern when the same pattern continues. The present invention is characterized in that the recording area of the recording head is shifted several dots at a time for every number of recording sheets.

The present invention compares the data at a specific dot position in the main scanning direction from the first line to the last line in the sub-scanning direction, such as the first and second sheets of recording paper, the second and third sheets, and so on. If so, the effective recording area is shifted from left to right for each recording paper, and for example, on the fourth paper, the effective recording area is shifted back to the same position as the first paper. By doing so, the effective recording area and the light emitting elements at both ends thereof are used equally, preventing disparity in deterioration over time of use, and extending the service life.

(Example) FIG. 1 is a time chart illustrating the operating principle of the system of the present invention. For example, (1) in the figure is the ENABLI signal output from the image control circuit (circuit) of the printer, and when this signal (1) is LOW, the
This is the time T required per line. (2) in the same figure is the LGATE signal output from the image control circuit, and when this signal (2) is oW, the time t required for actual recording is
(a signal indicating the image writing position in the main scanning direction). That is, it indicates an effective recording area.

As shown in the figure, at time T of the ENABLE signal (1), the LGAT signal (2) is applied sequentially from left to right for a certain period of time, starting with the first, second, and third sheets of recording paper as shown in the figure. Shift the timing so that the fourth image is at the same timing position as the first image. That is, the effective recording area is shifted by the LGATE signal (2) every specific number of recording sheets, and the light emitting elements of the solid-state scanning recording head are made usable on average in the effective recording area and both ends thereof.

In the example shown, the effective recording area is shifted for each sheet of recording paper, but it is shifted for each sheet of recording paper, and then after recording multiple sheets,
It may be possible to start from the original effective recording area.

FIG. 2 shows a circuit diagram of one thirty-one embodiment for implementing the operating principle of FIG. In the same figure, 1 is a counter that counts the image write clock WCLK, and 2 is a counter that counts the image write clock WCLK.
an up/down counter that counts the TE signal (frame gate signal indicating the image writing position in the sub-scanning direction);
3 and 4 are decoders; 5 is a write position parameter setting circuit; 6 is a write end position parameter setting circuit; 7 is an area selection parameter setting circuit; A circuit for selecting a writing position; 9 a circuit for selecting an area and an end position from the outputs of the area selection parameter setting circuits 6 and 7; 10 a writing position and an end position of the selection circuits 8 and 9; It operates with a signal indicating L G A, T
A flip-flop circuit (F/F) outputs the E signal (FIG. 1(2)), 11 is a data comparison circuit, and 12 is a comparison position determining circuit for data to be compared.

Next, the operation will be explained. The data comparison position determining circuit 12 determines which dot in the main scanning direction is to be compared. The dot data specified by this signal and the VIDEO (modulated image data) signal is extracted from the first line to the last line, and is compared with the previous data and temporarily stored. This is the data comparison circuit 11.

This comparison result is sent to an up/down counter 2, and if the comparison result is different, this counter is in a stopped state, and if the comparison result is the same, it is in an operating state.

In other words, if the comparison results are the same, the writing position will be shifted from the next recording paper.

On the other hand, the counter 1 counts the image write clock WCL, the decoder 3 decodes it, and outputs it to the write position parameter setting circuit 5 and the write end position parameter setting circuit 6.

° In the write position parameter setting circuit 5, for example, the write position parameters are set from the 3rd dot on the first sheet to the 2nd dot on the first sheet.
The dots are output by shifting (even) three dots at a time, starting from the 6th dot on the 3rd page, starting at the 9th dot on the 3rd page, and so on. In addition, the end-of-writing position parameter setting circuit 6 sets the end-of-writing position parameter to 2552nd dot 1-th for the first sheet, up to 2555th dot for the second sheet, up to 2558th dot for the third sheet, and so on. Output by shifting (shifting) dots one by one. It is assumed that the absolute number of dots recorded in one line is 2560 dots.

On the other hand, the up/down counter 2 counts the number of recording sheets using the FGATE signal, decodes it with the decoder 4, and outputs it to the area selection parameter setting circuit 7. This output generates parameter values such as, for example, l(OII) for the first sheet, "1" for the second sheet, and "2" for the third sheet. Output to.

The write position selection circuit 8 selects the parameter values (A) of the area selection parameter setting circuit 7 and the write parameters (B) to (A) of the write position parameter setting circuit 5 (B) 1st sheet...110 II...2nd sheet to write from the 3rd dot...1'''...6 33rd sheet...Select one of "2"...9.Select the writing end position in the same way circuit 9
Now, from the parameter value (a) of the area selection parameter setting circuit 7 and the end-of-writing parameter (two) of the end-of-writing position parameter setting circuit 6, (a)
(1) 1st page..."0"...Write up to 2552 dots. 2nd page..."1"...2555
n33rd piece... “2”...2558
Select one of II. In other words, (a) (b) (beginning) (tsu) (end) 1st page...
・ “0” ...3 to 25522nd sheet...
1”...6 ~ 25553rd piece... “2”
...One of the combinations 9 to 2558 is selected by both selection circuits 8 and 9, and the flip-flop circuit (F/F
) 10 is output as the LGATE signal ((2) in FIG. 1).

In this way, by changing the recording area little by little by combining the parameters, it is possible to prevent imbalance in the deterioration of the light emitting element due to use over time between the effective recording area and both ends thereof.

(Effects of the Invention) As explained above, when performing recording control using a solid-state scanning recording head, the present invention detects each pattern of recording paper and changes the recording area when the same pattern continues. By changing it little by little for each specific number of sheets, it is possible to reduce the difference in deterioration of the light emitting element over time between the effective recording area and both ends thereof.

[Brief explanation of the drawing]

FIG. 1 is a time chart illustrating the operating principle of the system of the present invention, and FIG. 2 is a circuit diagram of an embodiment for implementing the method shown in FIG. 1... Image write clock (WCLK) counter,
2... Frame gate signal (FGA lower 100) counter, 3, 4... Decoder, 5... Write position parameter setting circuit, 6... Write end position parameter setting circuit, 7... Area selection Parameter setting circuit, 8 ・
...Write position selection circuit, 9...Write end position selection circuit, 10...Flip-flop circuit (F/F) for generating line gate signal (LGATE), 11...Data comparison circuit, 12...・Data comparison position determination circuit.

Claims (1)

[Claims] When recording an image using an array-shaped solid-state scanning recording head that has a plurality of light emitting elements arranged, the pattern on each sheet of recording paper is detected, and when the same pattern continues, the pattern is recorded every specific number of recording sheets. A recording control method for a solid-state scanning recording head, which is characterized by recording by moving the recording area of the head several dots at a time.