JPH02305065A - Image reader - Google Patents

Abstract

PURPOSE:To arbitrarily select vertical and horizontal image read ranges within the maximum image read range by adding a variable read limiting means such as a slide volume, etc., to an image reader. CONSTITUTION:Slide volumes 20, 21 are inserted into the rear of a photoelectric converting element, and in an electric signal read by the photoelectric converting element, the slide volume 20 limits the vertical direction, and the slide volume 21 limits the horizontal direction. In this regard, this read range is limited by a read limiting means constituted of the slide volumes 20, 21 and electronic parts arranged on a printed circuit board. In such a manner, by varying an image range by a variable means such as the slide volumes 20, 21, it can be set arbitrarily to an image read range conforming with its information.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image reading device used in information-related equipment such as personal computers and word processors.

2. Description of the Related Art The prior art will be described with reference to the conventional image reading apparatus shown in FIGS. 2 to 4. Figure 2 is a top view of the device;
The figure is a side perspective view of the main part, and FIG. 4 is a bottom view of the same.

2 to 4, 1 is an upper case of the main body, 16 is a lower case of the main body, 11 is a reading density adjustment knob, 12 is a gradation changeover switch, and 4 is a cable for connecting to a word processor or the like. The main body lower case 16 is provided with an opening 19, and the roller 8 has bearings 18 at both ends thereof.
It is rotatably attached so as to protrude slightly from the lower surface of the main body lower case 16. The roller 8 also includes a disk 9 having a plurality of through holes that rotates in conjunction with the rotation of the roller 8, and an optical sensor 10 disposed at a position sandwiching the through holes of the disk 9. This constitutes a position detector. A light source 5 and a mirror 6 are attached to a metal plate 7 near one opening, and together with a lens 13 form an optical section. is focused on the lens 13 by the mirror 6, and the printed wiring board 1 near the rear focal point of the lens 13 is focused.
The reflected light of the image information 17 is converted into an electric signal by an electronic component (not shown) such as a light-to-electrical conversion element 14 provided on the image information 5.

Problems to be Solved by the Invention However, in the above-mentioned conventional image reading device, the image reading range is determined optically, and in the conventional technology, for example, 64 rm x 64 mm is common, and for example, 3
Even if it is desired to read an image of only 0x30nwa, the surrounding images must also be read, which poses problems such as the need for re-editing after reading.

The present invention solves these conventional problems,
It is an object of the present invention to provide an image reading device in which vertical and horizontal image reading ranges can be arbitrarily selected within the maximum image reading range.

Means for Solving the Problems In order to solve the above problems, the present invention adds a variable selection means such as a slide volume for electrically selecting an image range within an optically determined image range. be.

Therefore, according to the present invention, by varying the image range using variable means such as a slide volume, it is possible to arbitrarily set an image reading range that matches the information.

Embodiment An embodiment of the image reading apparatus of the present invention will be described with reference to the top view of FIG. Note that the same parts as in the conventional example are given the same numbers, and explanations thereof will be omitted.

20.21 is inserted after the optical/electrical conversion element 14, and 20 out of the electrical signals read by the optical/electrical conversion element 14.
is a limit in the vertical direction, and 21 is a slide volume that limits in the horizontal direction. The reading range is limited by reading limiting means constituted by the slide volume 20.degree. 21 and electronic components (not shown) arranged on the printed wiring board. The operation is explained below.
Resolution 8 dots/unit, maximum image reading range 64 mm
To explain in detail using the case of x64mm as an example, the horizontal direction (
The image range (in the width direction of the image reading device) is determined by the optical design, and the optical/electrical conversion element used is 64 rt
It has a capacity of a x 8 dots = 512 dots or more. By comparing these 512 dots with the maximum resistance value of the slide volume 20, the image range of the slide volume (in the direction of movement of the image reading device) is determined by a position detector such as an optical encoder. Detect.

These 512 pulses are compared with the maximum resistance value of the slide volume 21. In the above embodiment, the image range is regulated by the slide volume, but a rotary volume may be used, and a slide or rotary encoder may also be used. It's good.

Effects of the Invention As is clear from the above embodiments, the present invention is an image reading device in which a variable reading restriction means such as a slide volume is added, and the vertical and horizontal ranges of the image reading range are adjusted to the slide VR, etc. By operating the variable reading restriction means, the image reading range can be arbitrarily selected within the maximum image reading range, making operations on a personal computer or word processor extremely easy without the need for editing work. It is possible to do this.

[Brief explanation of drawings]

Fig. 1 is a top view of an image reading device that is an embodiment of the present invention, Fig. 2 is a top view of a conventional image reading device, Fig. 3 is a side perspective view of the same main part, and Fig. 4 is a bottom view of the same. It is. 1...Top case, 4...Cable, 5...Light source, 6...Mirror, 7...
... Sheet metal, 8 ... Roller, 9 ...
・Disc, 10... Optical sensor, 11...
・Reading density adjustment knob, 13... Lens, 1
4... Optical/electric conversion element, 15... Printed wiring board, 16... Main body lower case, 20
．． 21...Slide volume. Name of agent: Patent attorney Shigetaka Awano and one other person Figure 1 Figure 2

Claims (1)

[Claims] an optical section that illuminates images such as letters and figures with a light source such as an LED, and focuses the reflected light with a lens via a mirror;
An optical/electrical conversion element for converting the focused image information into an electrical signal, a position detector for detecting the position of the image information, and an image reading range within the maximum image reading range of the above image information amount. An image reading device comprising a reading restriction means that makes it possible to select.