JP2570586B2 - Scanner device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanner device,
More specifically, the present invention relates to a scanner device having features in detecting a document size and setting a reading range in the sub-scanning direction.

[0002]

2. Description of the Related Art As shown in FIGS. 3 and 4, a conventional scanner device has a movable optical table 1A having an optical reading element (not shown), a photo interrupter 10, a document table 9, and hands 11e and 11f. And

The moving optical table 1A and the photo interrupter 10
And are fixed. When reading the original 3 placed on the original platen 9, as the moving optical table 1 </ b> A moves in the sub-scanning direction 4, the photo interrupter 10 moves the hands 11 e and 11 f.
Is detected, and the reading range in the sub-scanning direction from the first detected point (the pointer 11e) to the next detected point (the pointer 11f) is regarded as an effective image. In FIG. 3, the effective image of the document 3 is indicated by hatching.

[0004]

However, the conventional scanner has the following problems. When reading a small-sized document 3 on the platen 9, it is difficult to accurately adjust the position to be read because the distance d from the tips of the hands 11e and 11f to the document 3 is large. In order to set the size of the placed document 3, a switch operation on the operation panel or the like was required.

[0005]

A scanner device according to the present invention has been made to solve the above-mentioned problems.
A document table on which a document is placed and which has optical transparency; a moving optical table that reads the document with an optical reading element while moving on the document table in the sub-scanning direction; Two pointers are provided in the sub-scanning direction of the surface and movable in the main scanning direction and the sub-scanning direction, light emitting elements provided for each of these pointers, and the movable optical table for each document size. A light receiving element that is provided correspondingly and receives light from the light emitting element and converts the light into an electrical detection signal, and a control unit that determines a reading range of the movable optical bench based on the detection signal. It was provided.

The control unit determines the size of the document based on one of the detection signals of the light receiving element in accordance with the movement of the movable optical table, and determines the first detection signal and the next detection signal. The reading range in the sub-scanning direction is determined based on the signal.

[0007]

A document is placed on a document table, and the pointer is moved in a main scanning direction and a sub-scanning direction to a desired position.
Two hands are arranged in the sub-scanning direction, and the light of each light emitting element is transmitted through the document table. Therefore, the light receiving element can output a detection signal when it reaches the light emitting element.

When the movable optical table starts moving in the sub-scanning direction, first, light from the first light emitting element is received by one of the light receiving elements, and the light receiving element outputs a detection signal. Then
The control unit determines the document size (reading range in the main scanning direction) based on which light receiving element outputs the detection signal, and starts reading the document within the document size using the movable optical bench.

When the moving optical table further moves in the sub-scanning direction, the light of the next light emitting element is received by the light receiving element which has output the first detection signal, and the light receiving element outputs the detection signal again. Then, the control unit terminates the reading of the document by the movable optical bench. Thus, the reading range in the sub-scanning direction is determined by the first detection signal and the next detection signal.

[0010]

FIG. 1 is an explanatory view showing an embodiment of a scanner device according to the present invention, and FIG. 2 is a side view of FIG. Hereinafter, the present invention will be described with reference to these drawings. FIG.
Is a plan view in which a block diagram and a waveform diagram are added.

A scanner device according to the present invention includes an original table 2 on which an original 3 is placed and which has optical transparency, and an optical reading element (not shown) which moves the original 3 while moving on the original table 2 in the sub-scanning direction 4. And a pointer 6e disposed in the sub-scanning direction 4 on the opposite surface 2b of the original placing surface 2a of the original table 2 and movable in the main scanning direction 8 and the sub-scanning direction 4. , 6f, LEDs 7e, 7f as light emitting elements provided on hands 6e, 6f, respectively,
LED7
e, 7f, and receives electrical detection signals 15g, 15g.
The light receiving elements 5g, 5h, and 5i for converting the light into h and 15i, and a control unit 16 that determines the reading range of the movable optical bench 1 based on the detection signals 15g, 15h, and 15i.

Next, the operation of the scanner device according to the present invention will be described.

A document 3 is placed on a document table 2. Then, the hands 7e and 7f are moved in the main scanning direction 8 and the sub-scanning direction 4 to a desired position. Two hands 7e, 7f are arranged in the sub-scanning direction, and the respective LEDs 7e, 7f
The light of f is transmitted through the document table 2. Therefore, the light receiving elements 5g, 5h, and 5i can output the detection signals 15g, 15h, and 15i when reaching the LEDs 7e and 7f.

When the movable optical table 1 starts moving in the sub-scanning direction 4, first, the light of the LED 7e is applied to the light receiving elements 5g, 5h, 5i.
(In this example, the light receiving element 5g), and the light receiving element 5g outputs a detection signal 15g. Then
The control unit 16 determines the document size (reading range in the main scanning direction 8) based on the detection signal 15g, and starts reading the document 3 within the document size by the movable optical table 1.

When the movable optical table 1 continues to move in the sub-scanning direction 4, the light of the LED 7f is received by the light receiving element 5g, and the light receiving element 5g outputs the detection signal 15g again.
Then, the control unit 16 terminates the reading of the document 3 by the movable optical table 1.

As described above, the reading range in the sub-scanning direction 4 is determined by the first detection signal 15g and the next detection signal 15g. In this example, the shaded portion of the document 3 shown in FIG. 1 is treated as an effective image.

The controller 16 outputs a reading signal 16j as a reading range in the sub-scanning direction 4 and a document size signal 16k as a reading range in the main scanning direction 8, and controls reading of the document 3 by the movable optical table 1. I do.

[0018]

As described above, according to the present invention,
A light emitting element is provided on the pointer which can be moved in the main scanning direction and the sub scanning direction, and a light receiving element is provided on the movable optical table corresponding to each document size, and the light emitting element is detected by the light receiving element, so that the size is small. By moving the pointer in the sub-scanning direction for the original, the reading range can be set accurately, and the size of the placed original can be automatically set.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention.

FIG. 2 is a side view of one embodiment of the present invention.

FIG. 3 is a plan view of a conventional example.

FIG. 4 is a side view of a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Moving optical table 2 Document table 2a Document table on document table 2b Opposite surface of document table on document table 3 Document 4 Sub-scanning direction 5g, 5h, 5i Light receiving element 6e, 6f Pointer 7e, 7f LED (light emitting element) 8) Main scanning direction 15g, 15h, 15i Detection signal 16 Controller

Claims (2)

(57) [Claims] 1. A document table on which a document is placed and having optical transparency, a moving optical table for reading the document with an optical reading element while moving on the document table in a sub-scanning direction, and a document on the document table Two pointers arranged in the sub-scanning direction on the opposite side of the mounting surface and movable in the main scanning direction and the sub-scanning direction, and light emitting elements provided on each of these pointers,
A plurality of light receiving elements are provided on the moving optical table corresponding to the respective document sizes and receive light from the light emitting elements and convert the light into electrical detection signals. A controller for determining a reading range. 2. The control section determines a document size of the document based on a detection signal of one of the light receiving elements in accordance with the movement of the movable optical table, and further includes a first detection signal and a next detection signal. 2. The scanner device according to claim 1, wherein a reading range in the sub-scanning direction is determined based on the signal.