JPS6010965A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To reduce a transmission time and also to attain the save of man-hour and the high service life of a light source section by waiting for the start of scanning of a picture until write is attained when write is disabled for plural memories and irradiating an original only during the scanning period. CONSTITUTION:The reflected light from an original 1 irradiated at the light source section 2 is transduced into an electric signal at a photoelectric transducing section 3, quantized at a quantizer 5 and stored in a memory 6. A picture signal stored in the memory 6 is band-compressed by a band compressing section 7, modulated by a modulator 8 and outputted to a communication line. The memory 6 has a storage capacity of two line's share and when both two memories (A,B) for one line's share each are not finished for transmission, the scanning of an original picture is awaited until either memory is enabled for write. When the transmission of the memory A is finished, a write request pulse to the memory A is transmitted, the scanning is started and the transmission of a picture signal of the memory B is conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a facsimile device that scans and transmits an image of a document line by line.

[Technical background of the invention and its problems]

The facsimile machine scans each image of the illuminated original one line at a time, photoelectrically converts the scanned image f of one line and stores it in memory, and converts the image signal stored in the memory into a After compression processing, it is output to a communication line and transmitted.

In order to output one line of image f to the communication line, it is necessary to write one image signal to memory, process band compression of the image signal written to memory, process tl, fC. "Transmission" of the image signal and "writing" more than one operation would be required. 1 processing" and "transmission" operations need to be performed sequentially for the "Fil>In" artist, so conventionally the memory was divided into two lines. It is possible to write as many images as possible, and the entire scanned line image is written alternately and processed in parallel, in order to shorten the transmission time.

The operation of such a conventional facsimile machine is shown in FIGS. 1 and 2. Assuming that the memory of the l-line image signal valve is memory A and memo IJ 33, one line of image signal is first written in by the write request pulse of memory A, as shown in Fig. 81. When writing to memo IJ A is completed, a write request pulse for memory B is generated, and the image signal for the next line is stored in memo IJ 33.While writing to memory B is completed, memory A is The image signal is subjected to full-band compression processing and transmitted. For the memo I713 as well, following the "write" operations, the "processing" and "transmission" operations are performed. When ``transmission'' is completed for both memory A and memory B, write the image signal for the next line. ``Processing'' Note that during this time, the document is continuously illuminated by the light source.

During such an operation, main scanning is repeated at a constant cycle, and if the "transmission" has not been completed in both memory A and memory B, the photoelectrically converted image signals are transferred to memory A.
Alternatively, the memo IJBK cannot be written and it is necessary to scan the same line again. Furthermore, actually 1iI
Since the processing time and transmission time of band compression are not constant depending on the family, the end time of the "transmission" operation is not necessarily synchronized with the main scanning cycle. Therefore, as shown in Fig. 2, from the "transmission" of the image signal to the "transmission" of the image signal of the next line.
There is a problem in that there is wasted time before writing. Since the shunted light source continues to burn until the transmission of one image of one document is completed, there is a problem that power is wasted and the life of the light source is shortened. The purpose of this invention is to provide a facsimile machine tt that eliminates dead time and noise, shortens the overall transmission time, and enables labor-saving and long-life light source parts.

[Summary of the invention]

In order to achieve the above object, the simili device according to the present invention] When any memory cannot be written to, it waits for the start of scanning of one image until writing becomes possible, and during the period of scanning the entire image. It is characterized by irradiating only the original.

[Embodiments of the invention]

A facsimile machine according to an embodiment of the present invention is shown in FIG. The facsimile machine according to this embodiment is the 81st! ,(
As shown in FIG. 1, the original 1 is irradiated by the light source section 2, and the reflection from the original gold is received by the photoelectric conversion section 8 and converted into an electrical signal. The photoelectrically converted 'nfC image signal is sent to an amplifier 4 and a purifier 5.
quantized by nl and stored in the memory 6. The image signal f′ stored in the memory 6 is band-compressed by the band compression unit 7,
The signal is modulated by the modulator 8 and output to the communication line.The control section 9 controls the operation of each of these sections. In this facsimile machine, the image of the original 1 is scanned line by line and the image 1st signal is written in the memory 6 line by line.
The written image (image signal) is band-compressed and transmitted line by line.The memory 6 has a storage capacity of 8 for 2 lines;
The memory space for each line is designated as memory A1 and memory B, respectively.

Next, the operation will be explained using FIG. 4. One feature of the operation of this embodiment is that the start of scanning of the original image is
, and memory B have not finished their "transmission", the process waits until either memory's "1-transmission" is finished and it becomes ready for writing. That is, first, a "write" operation of one line's worth of image signals is performed in memory A using a write request pulse. Since memory B is writable, a write request pulse is generated immediately after "writing" to memo IJ A is completed, and scanning is started,
Write 1° of both single-image signals for the next line to B J-((
i-konari. Next, when “writing” to memory B is finished,
Scanning is possible, but the memo IJA is in the middle of processing, and the memory B needs to perform one process on the image signal that has been written.

Since both memories B are not writable, scanning is not started and waits until the ``transmission'' of memory A is completed. When the ``transmission'' of memo IJ A is completed, a write request pulse to memo IJ A is sent. As soon as the signal is emitted, scanning begins. At the same time, "transmission" of the image signal of memo IJ33 is performed. Thereafter, the same operation is repeated, and if either memory A or memory B is writable, scanning will start immediately after the "transmission" ends, but if both are not writable, until it is determined that it is writable. Wait for Shusuke to start. By operating in this way, you can eliminate wasted time,
Communication lines can be used efficiently.

Another feature of this embodiment is the operation of the light source section 2. In other words, the light source unit 2 illuminates the document only during the scanning period, and the photoelectric conversion unit 8 is a solid-state microsensor, and the light source unit 2 illuminates the document for the storage time of the solid-state sensor. do. By operating in this way, it is possible to extend the life of the light source and save labor.

In the previous embodiment, the memory had a capacity for only two lines, but if it had a capacity for three or more lines, it would be possible to further eliminate wasted time and shorten the time for using the communication line.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce the transmission time by eliminating wasted time, and it is also possible to save labor and extend the life of the light source.

[Brief explanation of drawings]

1 and 2 are time charts showing the entire operation of a conventional facsimile machine, FIG. 8 is a block diagram of a facsimile machine according to an embodiment of the present invention, and FIG. 4 is a time chart showing the operation of the same facsimile machine. It is. 1... Original document, 2... Light source section 53... Photoelectric conversion section,
4...Amplifier, 6...Quantization unit, 6...Memory,
7...Band compressor, 8...Modulator, 9...Controller. Applicant's agent Kiyoshi Inomata]

Claims (1)

[Claims] A light source section that irradiates a document, and a light source irradiated by this light source section.
c A scanning section that scans the image of the original one line at a time; In the 77 Kushimi device, which is equipped with a plurality of memories that store signals line by line, and a transmission section that performs band compression processing on the image signal and sequentially transmits it line by line, The scanning unit stores the image signal stored in any one of the plurality of memories in one of the plurality of memories when the transmission of the image signal is completed. (7) After the transmission is completed, scanning of the image of the next line is started, and the light source unit illuminates the document only during the period when the image is scanned by the scanning unit. A facsimile device featuring: