JPS6236971A - Scanning device - Google Patents

Abstract

PURPOSE:To read and record a picture sharply at a high speed by controlling the scanning density of a scanning means based on a signal pattern of a binary signal. CONSTITUTION:A picture read clock signal is sent to a sensor 12 to read the contrast of a picture as an analog signal. This signal is amplified, quantized by a binary-coding circuit 14 to form a binary digital value with logic '1' for white level and logic '0' for black level and sent to a shift register 22 in synchronizing with the clock. In case of the data constitution where the level of elements SH1, SH2 of the register 22 are logic '1' and elements SH2, SH4, SH5 are logic '0', that is 101, the output of an AND gate 18 goes to logic '1' and this signal is counted up by a pulse counter 23. An AND gate 19 outputs logic '1' in case of the data constitution of 1001 and an AND gate 20 outputs logic '1' in the data constitution of 10001 respectively. When the counter 23 counts a prescribed number of pulses, a decoder 24 outputs logic '0' to set a FF 26 and logic '1' is inputted to an I/O port 25. A CPU discriminates this level to apply mode control.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a scanning device, and more particularly to a scanning device for reading or recording image information.

[Prior Art] When reading a document using a conventional scanning device of this type, such as a facsimile machine, the feed pitch for transporting the document in the sub-scanning direction is as small as about 0.13 mm, depending on the density of image information on the document. Or about 0.26mm
By increasing the size of the image and reading it, it is possible to obtain a certain image quality depending on the image density.

Further, in the case of a document with a low density of image information, the transfer pitch becomes large, so that the time required to read the document can be made faster.

Normally, fine mode is used when the feed pitch is reduced.
The case where the feed pitch is increased is called the standard mode.

On the other hand, the selection between fine mode and standard mode is generally left to the discretion of the operator.

That is, as shown in FIG. 6, a fine and standard mode selection switch 8 is provided, and this switch 8 is used to change the mode. In the state shown in Figure 6, the standard mode is selected, and the I10 boat 9
0” is detected and this state is transmitted to the CP via the data bus 10.
After the UII confirms this, it outputs a signal to control the feed pitch in the sub-scanning direction corresponding to this state.

[Problem to be solved by the invention] However, unless Fine mode is selected, if an unreadable original is accidentally sent in Standard mode, the recipient will be unable to decipher the information. .

Furthermore, when a document with low density of image information that can be transmitted in the standard mode is transmitted in the fine mode, there is a problem in that the transmission time is longer than necessary.

1-In addition to the above-mentioned inconveniences, the act of the operator selecting these modes is extremely cumbersome.

The above-mentioned disadvantages occur because the scanning means for reading or recording does not automatically determine the density of the image information being read or recorded.

[Means for solving the problems] In the present invention, 1- In order to solve the above problems,
A structure is adopted that includes a scanning means for performing reading or recording scanning, and means for controlling the scanning density of the scanning means based on a binary signal from the scanning means or a signal pattern of a binary signal sent to the scanning means. did.

[Function] - By adopting the structure described above, it becomes possible to automatically perform reading scanning according to the image or recording scanning according to the data, and it is possible to read and record images clearly and at high speed. can do.

[Example] Hereinafter, the present invention will be described in detail based on the example shown in the drawings.

Figures 1 to 5 illustrate an embodiment of the present invention.
2 to 4 schematically show the reading section.

That is, what is indicated by reference numeral 1 in FIGS. 2 to 4 is a document, and this document 1 is sent to a reading position through between a document presser 5 and a feed roller 6.

The upper part of the feed roller 6 is a reading position, and the sensor array 2 is arranged on the -1- side of the reading position via a short focus lens 3.

As shown in FIG. 2, this sensor array 2 has a configuration in which a large number of sensor cells S1 to SN are arranged in the width direction of the document.

Note that the reference numeral 4 is an LED array for reading the original.

Further, what is indicated by the reference numeral 7 in FIG. 4 is a white reference plate.

-1- The sensor array 2 described above detects the density of document image information and determines whether to send it in fine mode or standard mode.

This mode discrimination circuit is shown in FIG.

What is indicated by the reference numeral 12 in FIG. 1 corresponds to the sensor array 2 described above.

The output from this sensor 12 is input to a shift register 22 via an amplifier circuit 13 and a binarization circuit 14.

Specifically, when an image reading command is issued, a clock signal for reading is sent to the sensor 12, and the shading of the image is read as an analog signal.

The read analog signal is amplified by the amplifier circuit 13, quantized by the binarization circuit 14, and white is "l".
, black "0", and sent to the shift register 22 in synchronization with the read clock.

The binarized signal is also sent to a data processing circuit (not shown).

On the other hand, elements SHI and SH3 of the shift register 22 are "1".
”, SH2, SH4, SH5 are “O”, that is, rl O
In the case of a data structure in which there is one black signal between white signals, such as IJ, the output of the AND gate 18 becomes "1", and this signal is input to the pulse counter 23 which passes through the OR gate 21, and the count-up operation is performed. It is done.

Note that the AND gate 19 has elements SHI and SH4 set to "1".
”, elements SH2, SH3, SH5 are “0”, that is, rl
rlJ is output when the data configuration is such that there are two black signals between white signals, such as OOIJ.

Also, in the AND gate 20, the elements SHI and SH5 are "1".
, elements SH2, SH3, and SH4 are "0", that is, rloo
It is configured to output rlJ when there are three black signals between white signals like oIJ, and when the AND gates 18 to 20 output "1", the pulse counter 23 It is configured to count up. FIG. 5 shows the structure of the data counted by this counter and the calculation timing.

When this pulse counter 23 counts the number of pulses up to a predetermined number of pulses set in advance, the decoder 24
"0" is outputted from the I10 port 25, the flip-flop 26 is set, and "1" is inputted to the I10 port 25.

As a result, the CPU (not shown) connected to the pass line of I10 port 25 determines this input level,
Control is performed to automatically enter fine mode.

Further, when "0" is input to the I10 port, control is performed so that the standard mode is set.

In this way, you can automatically select between fine mode and standard mode.

Incidentally, the value of the set value
The optimal data configuration is not limited to the three types of J and rlooolJ and may be determined through experiments.

The switch indicated by reference numeral 15 in FIG. 1 is activated at a timing when there is no need to detect the density of the image information of the original, for example, when the trailing edge of the original passes the reading position, and the switch is activated to send a reset signal to the flip-flop 26. Just let it out.

Further, in FIG. 1, a portion surrounded by a dotted line indicated by reference numeral 16 shows the entire circuit for determining whether the mode is the fine mode or the standard mode.

In addition, the receiving side facsimile machine is also provided with the discrimination circuit 16 shown in FIG. 1, and controls the sub-scanning density of recording scanning based on the received image data in the same way as in the case of document reading scanning.゛, the image will not be deformed,
Images can be obtained exactly as they were read on the sending side.

Incidentally, the Kinomi method is not limited to reading or recording scanning of a facsimile machine, but can be implemented in any scanning device that reads or records images by alternately performing main scanning and sub-scanning.

[Effects] As is clear from the above description, according to the present invention, reading scanning according to the image or recording scanning according to the data is automatically performed, so it is possible to read and record images clearly and at high speed. It is possible to obtain a scanning device capable of

[Brief explanation of the drawing]

Figures 1 to 5 illustrate an embodiment of the present invention.
Figure 1 is a block diagram of the control circuit, Figure 2 is a side view of the reading unit, Figure 3 is an explanatory diagram of the sensor array, Figure 4 is a perspective view of the reading unit, and Figure 5 is the data configuration and counting timing. FIG. 6 is an explanatory diagram of a conventional structure. l...Km 2...Sensor array 16
...Discrimination circuits 18 to 20...AND gate 21...OR gate 22...Shift register 2
3...Pulse counter 24...Decoder 25...I10 port 26
···flip flop

Claims (1)

[Claims] A scanning device for performing reading or recording scanning, and a device for controlling the scanning density of scanning by the scanning device based on a binary signal from the scanning device or a signal pattern of a binary signal to the scanning device. Characteristic scanning device.