JPS60153078A - Memory - 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 (Technical Field) The present invention relates to a recording device that can easily obtain a normal image and a reverse image.

(Prior Art) There are two methods of capturing image information and obtaining an inverted image: a method that does not use electrical means, and a method that uses electrical means to invert the image. An example of the former is a method called close-contact printing, in which a reverse image is created by overlapping films and exposing them to light. As an example of the latter, there is a method in which a reverse dot image is stored in the character ROM from the beginning, or a method is adopted in which the dot image is not read in reverse when reading from the character ROM. The former contact return method is affected by the characteristics of the film, the properties of the irradiated light (diffraction, unevenness, etc.), and the character quality deteriorates compared to the original print quality. On the other hand, there is a method to store a reversed dot image in the character ROM from the beginning.
This is the case with printers, etc., which are not needed at the same time as both old and reverse images, and are not used in phototypesetting, where both are required. Regarding the method of reading from the reverse when reading from the character ROM, as mentioned above, there is no problem if you always read from the reverse, but if you use both forward and reverse images, you must preset the reading procedure each time. . Furthermore, in the case of proportional characters, the preset value may change for each character, resulting in a very complicated circuit configuration.

(Objectives of the Invention) The present invention has been made in view of the above points, and its objects are: - To realize a recording device that can easily obtain a normal image and a reversed image.

(Structure of the Invention) The present invention achieves the above-mentioned object by providing a recording device J''3 in which the image output control signal is a dot image.
A normal image is obtained by storing the normal image pixel data in a buffer memory and reading it out in a first-in, first-out manner.The value of the write counter is preset to the read counter. It is characterized by a structure in which an inverse image is obtained by reading the data using a store.

<Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The figure is an electrical diagram showing one embodiment of the present invention. In the figure, numerals 1 and 2 are line buffer memories (hereinafter simply referred to as buffer memories) that sequentially store pixel data therein. A write address and a read address are input separately to the address input section, and one of them is selected as required. 3 receives clock GK and buffer memory 1゜2
4 is a read counter which receives the address output of the write counter as preset data at its data input section and provides a read address to the buffer memory 1.2 in response to a clock CK'. SW is a selector switch that selects up-counting or down-counting, and when its contact is connected to the ground side, up-counting is selected, and the power supply side (usually 5V)
When connected to , down count is selected. Both the write counter 3 and the read counter 4 are input with a set signal that resets the values from the first to the first count, and the read counter 4 inputs the count value to the value input to the data input section. The load signal l-fl is input.

The operation of the device configured as described above will be explained as follows.

First, the operation in the case of a normal image will be explained.

■ Move the address line of buffer memory 1 to the write counter 3 side. Then turn the selector switch SW up to 1~
Set it on the side. The write counter 3 is now in up mode and starts from 0 to run 1. The output of the counter 3 becomes the address of the buffer memory 1, and pixel data is sequentially written from address O.

When writing of 0 pixel data is completed, the address line is moved to the read counter 4 side. Then, the contents of the read counter are reset to O, and pixel data is read from the buffer memory 1 by counting up from address O.

(2) Simultaneously with the operation (2) above, the address line of the buffer memory 2 is set to the write counter 3 side, the normal image pixel data is sequentially counted up from count O, and the pixel data is stored in the buffer memory 2 sequentially from address O.

∎After completing the operations ① and ② above, reverse the address lines. That is, buffer memory 1 has write counter 3.
The buffer memory 2 is placed on the read counter 4 side. Then, the count is increased from the count O, and pixel data is sequentially written and read.

By repeating the above operations, buffer memory 1.
A normal image is output from 2. As is clear from the two series of explanations, the operation of the memory when outputting a normal image is a first-in-first-out (FIFO) operation.

Next, the operation in the case of a reverse image will be explained.

■Put the address line of buffer candy [S1] in and out to the counter 3 side. Then, set the changeover switch SW to the up count side. With this writing power, the counter 3 enters the up mode and starts counting from O. The output of the counter 3 becomes the address of the buffer memory 1, and pixel data is sequentially written from address O.

(2) When writing is completed, preset the R end count value of the write counter 3 to the L-output counter 4. Presetting is performed by inputting a load signal to the read counter 4. As the load signal, for example, a line recording prestart signal is used. And selector switch S
Set W to the down count side. As a result, the contents of the read counter 4 are sequentially counted down from the preset value. Therefore, data is sequentially output in the reverse direction starting from the last written data.

That is, inverse image data is output.

(2) After reading the value of the write counter 3 and writing it to the read counter 4, reset the write counter 3 and set its contents to 0. Next, the address of the buffer memory 2 is set to the write counter 3 side, the count is counted up from O, and pixel data is sequentially written into the memory 2 from address O. This operation is performed at the same time as ■.

(2) When writing and reading are completed, the value of the write counter 3 is preset to the read counter 4.

After this, the write counter 3 is reset and its contents are
Make it.

(2) This time, the buffer memory 1 counts up to count O and writes pixel data, and the buffer memory 2 counts down from the preset value and reads out the data.

By repeating the above operations, buffer memory 1
．． Output the inverse image from 2. As is clear from the above description, the operation of the memory when outputting a reverse image is a last if first out (L I FO) operation. By using the configuration shown in the figure, it is possible to easily output a dot image of a normal image when a normal image is specified, and a dot image of a reverse image when a reverse image is specified. Also, in the case of reverse image,
Since the readout start value is automatically preset in the readout counter, a reverse image can be obtained without worrying about the readout start value even if the image area changes.

(Effects of the Invention) As described above in detail, according to the present invention, the selection of whether to use a normal image or a reverse image is simply a matter of switching between setting the counter of the buffer memory to an up counter or a down counter. This becomes possible. Furthermore, when counting down, the value of the write counter is preset to the read counter, so even if the print area changes, there is no need to manually reset the read start value. That is, according to the present invention, when a reverse image is specified and the IC is used, the readout start point is automatically determined depending on the number of input normal image pixel data, and t
- Since the data stored in the IFO memory is read out, a reverse image can be easily obtained.

BRIEF DESCRIPTION OF THE DRAWINGS The figure is an electrical configuration diagram showing an embodiment of the present invention. 1.2...Buffer memory 3...Write counter 4...Read counter sw
... Changeover switch patent applicant Roku Konishi Photo Industry Co., Ltd. Agent Patent attorney Fuji Ijima 1 person

Claims (1)

[Claims] In a recording device where the image output control signal is a dot image, a normal image is obtained by storing normal image pixel data in a buffer memory and reading it out in a first-in first-out manner, and presetting the value of the write counter to the read counter. 1. A recording apparatus characterized in that a reading start point is determined by performing the steps 1 to 1, and a reverse image is obtained when reading last in first out.