JPS63129770A - Left-original alarm device for image read scanner - Google Patents

Abstract

PURPOSE:To eliminate a need for providing an original-presence/absence discriminating sensor otherwise and to reduce cost by using an image reading CCD sensor in common as the original-presence/absence discriminating sensor. CONSTITUTION:On the original-pressing surface of a pressing plate 2, stripes 11 are provided for the purpose of discrimination from an original. Since output signals from an unmagnification sensor vary in level, width pitch, etc., at the time of reading an original, but those at the time of reading the stripes 11 of the pressing plate 2 come regular, and the detection of an original is executed by identifying these different outputs. The number-remain zero of a repetition button is detected by a repetition end detector 12, and in case a presence results in said original-detection i.e., the detection results in a level H, if an operator detection 10 shifts from presence to absence i.e., from level H to level L, an alarm 17 shifts from L to H and operates. If an operator returns to the machine and takes out an original, an original-detector 16 turns from H to L, and the alarm 17 is turned off.

Description

[Detailed Description of the Invention] 1191 The present invention provides a document forgetting alarm device for a single image reading scanner;
More specifically, the present invention relates to a device that detects a document being left behind in a document reading scanner using a CCD sensor and issues an alarm.

1. At present, the following techniques, for example, have been proposed as techniques for detecting the presence or absence of a document in a copying machine.

(1) A document detection means consisting of a lamp and a light receiver is provided below the document glass (Japanese Utility Model Publication No. 53-126632). In this case, the original detecting means is specially provided at a position off the optical path for exposing the original, and there are restrictions on the structure and arrangement.

(2) An electrode is provided between the upper side of the original glass and the pressure plate, and the presence or absence of the original is detected by conducting or non-conducting.
48 Publication), this uses a transparent electrode because the document detection means is provided within the effective screen, but the transparent electrode has poor reliability and
There is a problem with durability.

The above is a direct detection type, but a primary indirect detection type will be explained.

(3) If the pressure plate is not opened or closed even after a predetermined period of time has passed after the end of exposure, it is recognized that the document remains and an alarm is issued (Japanese Unexamined Patent Publication No. 106027/1983).

In this method, the relationship between the thickness of the document and the opening/closing stroke of the pressure plate is delicate, and it is necessary to use a switch with a wide operating range.

In (2) and (3) above, an alarm will be issued if the state of ``Document present'' continues after a certain period of time after detecting ``Document present'', but if the fixed time is set too long, the alarm will be issued after the operator leaves. However, if the set time is short, a warning will be issued even if there is a slight delay in replacing the original, which is troublesome. The following has been proposed as an improved system that detects the presence or absence of an operator and issues a more accurate warning.

(4) If the operator leaves the document ``remaining'' due to opening and closing of the pressure plate, an alarm is issued (Japanese Unexamined Patent Publication No. 56-51763).

(5) The presence or absence of a document is detected using a dedicated means similar to (1), and an operator detector using a mat-like foot switch, optical application, or even ultrasonic waves is installed, and after copying is completed, the document is When the operator goes out of the operating range, an alarm is issued (Japanese Unexamined Patent Publication No. 57-81276).

(4) and (5) are improved when combined with operator detection, but there is a problem with document detection.

-15 The present invention was made in view of the above-mentioned circumstances,
In particular, it is a scanner that reads an original image with a CCD sensor and outputs the photoelectrically converted signal to a printer or CRT.
This was done for the purpose of using the CCD sensor for image reading as a sensor for determining the presence or absence of an original, and for issuing an alarm when the identification sensor determines that a document is present and the operator detection detects that there is no operator present. be.

In order to achieve the above object, the present invention reads an image of the original by moving and scanning an optical system consisting of an original glass that holds the original in a flat state, the original glass, a lamp, an imaging element, and a CCD sensor. In image reading scanners that perform
(1) It has an operator detection means for detecting the presence or absence of an operator, and an alarm means, which energizes the CCD sensor as a document presence/absence determination means by detecting the final exposure by the repeat end detection means, and the document presence/absence determination means (2) operating the alarm means when the operator detecting means detects the absence of an operator in a state where the operator detecting the presence of a document; or (2) an operator detecting means for detecting the presence or absence of an operator; When the end of the final exposure is detected by the repeat end detection means and the relative movement scanning is stopped, the CCD sensor is energized as the document presence/absence determining means, and the document presence/absence determining means detects the presence of the document. The present invention is characterized in that when the operator detection means detects the absence of an operator in the state where the operator is present, the above-mentioned alarm means is activated. An explanation will be given below based on one embodiment of the present invention.

FIG. 1 is a side sectional view of essential parts for explaining an example of a document reading scanner to which the present invention is applied. In the figure, 0 is a document, 1 is a document glass, 2 is a pressure plate, 3 is a lamp, and 4 is a A 1-magnification imaging element, 5 a 1-magnification sensor, 6 an exposure traveling body, 7 a cable, 8 a processing section, 9 an operating section, and 10 an operator detector. First, document 0 is placed on document glass 1. Place and press with pressure plate 2. When the original 0 is illuminated by the lamp 3, the reflected light is projected and imaged onto the 1-magnification sensor 5 by the 1-magnification imaging element 4.

A two-dimensional image of the original O is obtained by sub-scanning by scanning in the S direction of the exposure traveling body 6 holding the lamp 3, 1-magnification imaging element 4, and 1-magnification sensor 5, and main scanning by self-scanning of the 1-magnification sensor 5. Read the image. The output signal photoelectrically converted by the equal-magnification sensor 5 is taken out by a cable 7 and output to the outside via a processing section 8. What is connected to the outside is an inkjet printer, a thermal printer, or a CRT. The operation unit 9 includes a power switch, a start button, an alarm device, a repeat button, and the like. Further, an operator detector 10 is provided at the lower center of the main body. The operator detector 10 detects the presence of an operator and is a combination of a light emitter and a light receiver or a transmitter (ultrasonic wave) and a receiver, but it may also be a device that uses a foot switch, for example. .

FIG. 2 shows stripes 11 on the document pressing surface of the pressure plate 2 used in the present invention. In general, many originals have a white background, and stripes 11 are provided to distinguish them from originals. Note that a plain color such as black or gray may be used instead of the stripe. Furthermore, it may be made into a mirror surface, and if it is made into a mirror surface, the lamp 3
The illumination from the sensor is specularly reflected and does not reach the 1-magnification sensor 6. In other words, the pressure plate is in the same state as the black pressure plate when it is opened.

FIG. 3 shows the state of the output signal from the equal-magnification sensor 5.

■ indicates the output when reading the original, and the level height is 1.
The width, pitch, etc. become irregular. ■ is the output when reading the stripe 11 of the pressure plate 2, which is regular (III
, IV will be explained later).

Returning to FIG. 1 again, the operation will be explained. Figure 1 shows
This shows a state in which the reading of the original O has been completed and the traveling body 6 has returned to its home position. This position is just a breath away from the edge of the effective reading area of the document. The left end K of the effective area is the reference position for placing the original O, and Q should be shorter than the minimum original length, but approximately 5 to 30 mm is appropriate. It is necessary for the traveling body 6 to return to K when entering the main scan,
If the 0 is too long, the total time required for reading will increase.

FIG. 4 is a time chart for explaining the operation, and document detection starts at the same time as the traveling body 6 moves back (running in the opposite direction to S) in FIG. 1. This is to identify the difference shown by I and ■ in FIG. 3, and if the waveform ■ is recognized, it means that the document is present.The waveform ■, of course, indicates that there is no document. Further, the waveform when the traveling body 6 completes its backward movement, stops at the home position, and reads the white background portion (white paper portion) of the document is shown in (■). Although the probability is low, the waveform obtained by reading the ruled lines of the original is shown in ■. Waveforms m and tv' are also distinguishable from waveform (2), and waveforms DI and IV also appear in the "present" state.

In Figure 4, when the document detection is "present", that is, H, and the operator detection changes from "present" to "absent", that is, from H to L, the alarm goes to L.
It becomes H and starts operating. When the operator returns due to the alarm and takes out the original, the original detection changes from H to L, and the alarm turns OFF.

FIG. 5 is an electrical block diagram used to implement the present invention. In the figure, 10 is an operator detector, 12 is a repeat end detector, 13 is a start switch, and 14.15 is a flip-flop circuit (F/F ), 16 is a document detector, 17 is an alarm, and a repeat button (not shown) is used to detect the end of repeat.
The repeat end detector 12 detects that the number remaining is 0, and the operation starts when the traveling body 6 enters the backward movement. That is, this output changes from L to H in the NOT circuit 18, passes through the output of the start switch 13 and the AND circuit 19, and sets the F/F 14. The output causes the document detector 16 to be activated. Then, when the document becomes "present", the output of the operator detector 10 changes from L to H at NoT@m20, enters the AND circuit 21, and sets the F/F 15 with the output. AND circuit 22 indicates that repeat end detector 12 is N.
The output changes from L to H in the OT circuit 18.

The output of F/F 15 becomes H by AND, and the alarm 17 is activated by that output. When the operator takes out the document, the document detector 16 becomes 'absent'.

The NoT circuit 23 changes from L to H, resets the F/F 15 and deactivates the alarm 17. At the same time, the F/F 14 is also reset, and the document detector 16 enters the original document reading operation state.

6 is a block diagram for explaining another embodiment of the present invention, FIG. 7 is a time chart for explaining the operation of FIG. 6, and the block diagram of FIG. 6 is similar to that of FIG. 5. Although it is almost the same as the above, the difference is that a drive control section 24 and a NOT circuit 25 are provided. That is, when the drive control unit 24 stops the drive motor (not shown) for moving and scanning the exposure optical system, an output is generated and the NOT circuit 25 becomes H, indicating that the AN
It enters the D circuit 22 and activates the alarm 17. In the embodiment shown in FIG. 5, the presence or absence of a document is determined from the backward movement of the final exposure, but the determination during the backward movement is faster than the forward movement, and there are problems in terms of accuracy due to the amount of lamp light.

Further, since the backward movement is performed in an instant, the probability that the document will be taken out during this period is small. Therefore, in practice, the original is often taken out while the exposure is completed and the exposure is stopped. At this time, in COD, there is no sub-scanning, and the presence or absence of a document is determined only by main scanning. Although the above description has been made using a fixed document type, the present invention can also be applied to a movable document table type, and can also be applied to a normal reduction optical system using a lens.

Effects As is clear from the above explanation, according to the present invention, (a) Since the CCD sensor for image reading is also used as a sensor for determining the presence or absence of an M document, a sensor for determining the presence or absence of a document is separately provided. This eliminates the need for additional space and costs.

(b) It is energized as a sensor for determining the presence or absence of a document from the return of the final exposure, and an alarm can be issued even if the operator disappears during the return, so the response is quick.

(c) While the exposure optical system is stopped, the reading position of the CCD sensor is within the image area (the home position is inside the edge of the document), and the image reading sensor is activated as a sensor for determining the presence or absence of a document. Therefore, the determination can be made reliably.

There are advantages such as

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view of a main part for explaining an example of a scanner for reading a document to which the present invention is applied, FIG. 2 is a diagram showing an example of the document suppressing surface of a pressure plate, and FIG. The figure which shows an example of the output signal of a double sensor. FIG. 4 is a time chart for explaining the operation of the present invention, FIG. 5 is a diagram showing an example of an electrical block diagram used in implementing the present invention, and FIG. FIG. 7, an electrical block diagram for explaining the embodiment, is a flowchart for explaining the operation of FIG. 6. 0...Original, 1...Original glass, 2...Press plate, 3
... Lamp, 4... Equal magnification imaging element, 5... Equal magnification sensor, 6... Exposure traveling body, 7... Cable, 8...
- Processing section, 9... Operation section, 10... Operator detector, 11... Stripe. 12... Repeat end detector, 13... Start switch, 14.15... Flip-flop circuit. 16... Original detector, 17... Alarm, 25...
Drive control section. Figure 1. Figure 2. Figure 3. Figure 6 No. 7121 t *! l #L

Claims (3)

[Claims] (1) The presence or absence of an operator is detected in an image reading scanner that reads a document image by moving and scanning an optical system consisting of a document glass that holds the document flat, a lamp, an imaging element, and a CCD sensor. and an alarm means, wherein the CCD sensor is energized as a document presence/absence determination means upon detection of final exposure by the repeat end detection means, and the document presence/absence determination means detects the presence of a document. A document-forgetting alarm device for an image reading scanner is characterized in that the alarm means is operated when the operator detection means detects the absence of an operator. (2) The presence or absence of an operator is detected in an image reading scanner that reads a document image by moving and scanning an optical system consisting of a document glass that holds the document flat, a lamp, an imaging element, and a CCD sensor. When the end of final exposure is detected by the repeat end detection means and relative movement scanning has stopped, the CCD sensor is activated as a means for determining the presence or absence of a document, A document-forgetting alarm device for an image reading scanner is characterized in that the alarm means is activated when the operator detection means detects the absence of an operator while the presence/absence determination means detects the presence of the document. (3) The image reading scanner according to claim (2), wherein when relative movement scanning is stopped, the exposure reading position of the CCD sensor is set within the image reading area. Forgotten manuscript alarm device.