JPS59119964A - Detecting system of original setting anomalous for optical reader - Google Patents

Abstract

PURPOSE:To detect easily a setting anomalous of original by attaching a prescribed mark to the surface of an original mat set opposite to an original to be read. CONSTITUTION:A linear black mark 9 is attached to a prescribed position of an original mat for an optical device in which an original 3 is held by the mat 2. The mark 9 is covered by the original 3 if the original 3 is set in a normal way. However the mark 9 emerges if the original 3 is set with a shift. A CCD scanner 6 detects the mark 9 to detect a shift of the original 3.

Description

DETAILED DESCRIPTION OF THE INVENTION (4) Technical Field of the Invention The present invention relates to an optical reading device, and more particularly to a document setting abnormality detection method in an optical reading device that is capable of checking the set state of a document set on a document table. .

(Middle) Prior art and problems Figure 1 shows a schematic diagram of an optical reading device. The document table 1 is made of transparent heat-resistant glass or the like, and the document 3 is set on the document table 1. The original 3 is covered with the original mat 2.

The back surface (original facing surface) of the document mat 2 is made of a white material. To read the document set as described above, light is irradiated by the light source 4, the reflected light is focused by the lens 5, and the CCD scan/y6 reads l lines at a time. At this time, the JJA manuscript table l moves in the direction of the arrow in the figure. The data read by the CCD scan/4/6 is input to the preamplifier 7, amplified, and outputted as binary data by the A/D converter 8. When leaving the store, the position where the original is set is fixed. However, when the original is tilted, the reading device detects the angular difference from the normal setting position of the original and reads the data based on that value. automatically corrected the data. However, such a device has the disadvantage that the configuration is complicated.

C) Object of the Invention In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a method for detecting an abnormality in document setting in an optical reading device that can check the document setting position with a simple configuration.

(B) Structure of the invention and object of the present invention is to provide a transparent document table and a document mat that covers an original to be read placed on the document table, and to place the document on the document table via the document table. In an optical device that optically takes a P of the original to be read, a predetermined mark is placed on the surface of the original mat facing the original to be read, and when the mark is detected when the original is read, an abnormality in the original setting is detected. This is achieved by providing a method for detecting an abnormality in a document set in an optical reading device, which is characterized by the following.

■ Examples of the invention Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

Normally, the document setting position is fixed. FIG. 2(a) shows the situation at that time. The document table moves in the direction of the vertical arrow, and the horizontal arrow is the scanning direction. Also, the same parts as in FIG. 1 are represented by the same numbers.

As shown in the figure, the original 3 is placed in the center of the original mat 2,
ing. In the following description, a band-shaped black mark shown in FIG. 2 will be used as an example of the mark. The black mark 9 is attached to the surface of the document mat 2 that comes into contact with the document.
In FIG. 2(a) and FIG. 2(b), it is attached in a band shape at a position corresponding to the upper edge of the document. In the case of Fig. 2(a), the original 3 is placed normally, so the black mark 9 is covered by the original 3 and becomes blurred.However, in Fig. 2(b)
If the document 3' is displaced as shown in the figure, a black mark 9 appears and is detected by the CCDC scanner d6. As another embodiment, FIGS. 2(a)' and 2(b)' show a document set state in which a black mark 9' is provided perpendicularly to the scanning direction. In this case as well, as shown in FIGS. 2(a) and 2(b), if the document 3 is displaced, the mark will be detected by the CCD scanning sleeve. In this way, by checking the alignment of the document mat 2, it is possible to detect a document setting error.
This will be explained using Figure 3. Figure 3(a) shows each signal operation activation signal, VSYN is generated a little later than the 5TART signal,
LVSY, a signal corresponding to the time for irradiating one sheet of paper (for example, A4) with light, is a signal generated at the rising edge of VSYNI, which occurs at a slightly later time than the rising edge of the VSYN signal. FIG. 3(b) is a diagram for explaining the position where the black mark is detected in relation to the document. In the figure, numeral 10 is the original document, the shaded area 11 is the area where data to be read exists, ■, 0,0 is the margin area, and ■ is the area where data exists. Further, the vertical direction is the scanning direction, and the horizontal direction is the document feeding direction. FIG. 3(c) is a block diagram of a mark detection circuit for detecting an abnormality in document setting. In the same figure, 12.22.23 is an AND gate, 13
is orgate, 14.15, 16.17 is Philip 7
o, g, 18, 19, 20, 21 are counters, 24.2
5 is a counter, and 26 and 27 are Philip Frogges (hereinafter referred to as FF). The configuration of this circuit will be explained. The FF 14 and the counter 18 determine the scanning time of the area ■ in FIG. Yes, F'F17.The counter 21 determines the scanning time of the 0 area in the figure.FF14 is first set at the time when the LVSYN signal shown in FIG. . And vJ3
The carry of the counter 2o outputted at the end of the scanning of the 0 area shown in FIG.
Set F14 again. By inputting it as an AND gate 12, the end of scanning of the 0 area is detected. The output of FF 1.4 and the data read by the vSYN and CCD are input to the AND gate 22, and the data is detected by the counter 24 in the region (2) in FIG. 3(b). The number of black marks (black mark 9 in FIG. 2(a)) is counted, and when a predetermined number is reached, an alarm is generated by the FF 26. Similarly, the output of li'F17 and the data read by vSYN and CCD are input to the AND gate 23, and the black mark detected in the 00 area (FIG. 3(b)) by the counter 25 (FIG. 2(a) ) is counted, and when it reaches a predetermined number, the FF 27 generates an alarm.

Next, we will explain the operation of each part.0LVSYN is VS-
This is a signal generated at the rising edge of YN, and when the VSYN signal becomes 1, the rising signal LV SYN=1. Then, the output of OR gate 13 becomes 1, and FF-1
Set 4. By the output of this FF14, p counter 1
The 0 counter 18, which is enabled to count 8, monitors the completion of scanning of the area shown in FIG. 3(b) by counting clocks, and when the scanning of the area is completed,
Reset F14 by carry. The other output of FFI, 4 (is input to the AND gate 22. The 'ri and VSYN signals and the read data (hereinafter referred to as RD data) are input to the AND gate 22. Therefore, as shown in FIG. A black mark was placed along the feeding direction of the paper as shown in b).The black mark was detected during area scanning and RD was performed.
When the data becomes 1, the output of the AND gate 22 becomes 1. This output is input to the counter 24, and when the output of the AND gate 11 becomes 1 until the count reaches 1, for example, it sets the FF 26 and generates an alarm.
0FF14 reset by F26 operator etc.
At the same time as FF15 is reset, FF15 is set, and FF15 performs the same operation as the above-mentioned FF14 counter 18.
However, in this case, the counter 19 is not shown in FIG. 3(b).
Count and monitor the clock used for Then, when the end of scanning of the area [F]) is detected, the FF 15 is reset by carry, and the FF 16 is set. The FF 16 and the counter 20 input the completion of scanning of the 0 area shown in FIG. 3(b) to the anime game 12 by the carry of the counter 20 in the same manner as described above. At this time VS-f
Since N = 1, the output of game) 12 will also be 1, and the output of game) 13 will also be l, so F'F14 again
The counter 18 operates to monitor the completion of scanning.

Next, as another example, a case will be described in which a black mark is placed along the scanning direction of the paper as shown in FIGS. This counter 2
1 inputs the carry of the counter 20 as a clock. That is, the completion of scanning of the 0 area shown in FIG. 3(b) is monitored. When the end of scanning of the 0 area is detected, the FF 17 is reset.

The other output of FFI 7 is input to AND gate 23. The VSYN signal and RD data are input to the AND gate 23. When a black mark is detected during scanning of the 0 area in the oRD data, the output of the AND gate 23 becomes 1.ftD
For example, when the counter 25 counts mK, the FF 27 is set to generate an alarm.The values of n and m vary depending on the required reading accuracy.

Although the above description deals with the case where a black mark is attached to the original mat, abnormalities in the set of originals can be detected using marks other than black marks such as letters and symbols.

Effects of the Invention As described above in detail, by marking the document mat with a predetermined mark, there is an effect that the state of document setting can be easily checked.

[Brief explanation of drawings]

Figure 1 is a schematic diagram of the optical reading device. The Pjz diagram is a φ diagram for explaining a mark for detecting an abnormality in document setting according to an embodiment of the present invention, and FIG. 3 is a diagram for explaining an embodiment of mark detection. In the drawings, 1 is Wm platform, 2 is original i'4: i mat,
3 is fiX draft, 9, 9' are black marks, 12, 22, 23
Ke and gate, 13 is or gate, 14.15,16
. 17.26.27 is Philip 70 rug, 18.19
．． 20°21.24.25 is a counter.

Claims (1)

[Scope of Claims] l) A transparent document table and a document mat that covers the document to be read placed on the document table, and the document placed on the document table through the document table. In an optical reading device that optically reads an original, a predetermined mark is placed on the surface of the original mat facing the original to be read, and an abnormality in the original setting is detected when the mark is detected when reading the original. An original setting abnormality detection method in an optical reading device is characterized by: 2) Document setting abnormality detection in the optical reading device according to claim 1, wherein the mark (size) is attached to at least a part of the document mat facing the periphery of the document to be read. method.