JPH04156764A - Color picture reader - Google Patents

Abstract

PURPOSE:To read the position information of characters and graphics, etc., and color picture information by using plural light beams for picture reading having light emitting center wavelength different each other and light beams for position reading having the light emitting center wavelength different from the light beam for picture reading. CONSTITUTION:The color picture reader is equipped with a picture reading part 5, a position reading part equipped with a light source 6 for position reading and a position sensor 7, and a signal generator, and the picture reading part 5 is equipped with a picture reading light source 8 and a photoelectric sensor 9. The picture reading light source 8 radiates plural light beams for picture reading having the light emitting center wavelength different each other, and the light source 6 for position reading radiates the light beam for position reading having the light emitting center wavelength different from the light beam for picture reading, and the position sensor 7 and the photoelectric sensor 9 detect the light beam for position reading and the beam for picture reading respectively. Thus, the position information of the characters and the graphics, etc., and the color picture information of the characters and the graphics, etc., can be read.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a color image reading device.

[Prior Art] An example of an image reading device equipped with a photoelectric sensor that reads image information such as characters and figures, and a position sensor that reads positional information such as characters and figures is disclosed in Japanese Patent Publication No. 1-500.
The one described in Publication No. 553 is known. FIG. 6 shows a schematic perspective view of the image reading device disclosed in Japanese Patent Publication No. 1-500553, and FIG. 7 shows a schematic diagram of the bottom configuration of this image reading device. The image reading device 14 (FIG. 7) includes an image reading section 1 that includes an image reading light source and a photoelectric sensor.
5 and a position reading unit including a position reading light source 16 and a position sensor 17, a grid is formed vertically and horizontally, and the book 19 is placed on top of a book 19 or the like via a cover pad 18 (FIG. 6).

The gamma knee image information and position information read by the image reading device 14 are converted into electrical signals, and the electrical signals are output from the image reading device 14 to a host computer (not shown).

[Problem to be solved by the invention] The image reading light source included in the above image reading device includes:
For example, a green LED array having a single emission center wavelength in the range of 500 to 600 nm is used. When using an image reading device equipped with a light source having a single emission center wavelength, it is not possible to separate and detect the red component, green component, and blue component of a color original, so it is difficult to detect color image information. Unable to read.

The purpose of the present invention is to provide location information of characters, figures, etc.
An object of the present invention is to provide a color image reading device capable of reading color image information such as graphics.

[Means for Solving the Problems] According to the present invention, the above object is to provide an image reading light source that emits a plurality of image reading light beams having different emission center wavelengths, and a photoelectric sensor that detects the image reading light beams. and a signal generator that outputs a signal for sequentially turning on and off the plurality of image reading light beams and a signal for turning on and off the photoelectric sensor in response to the signal to the image reading light source and the photoelectric sensor, respectively; To provide a color image reading device characterized by comprising a position reading light source that emits a position reading light beam having an emission center wavelength different from that of the image reading light beam, and a position sensor that detects the position reading light beam. This is achieved by

! Example] Hereinafter, the present invention will be specifically explained with reference to Examples.

FIG. 1 shows an overall perspective view of an example of a computer stem equipped with a color image reading device of the present invention.

A color image reading device 2 of the present invention connected to a host computer 1 reads image information and position information on a color original 4 placed on a pad 3, converts it into an electrical signal, and outputs it to the host computer 1. .

FIG. 2 shows an example of a schematic diagram of the bottom part of the color image reading device of the present invention. The color image reading device 2 includes an image reading section 5, a position reading section including a position reading light source 6 and a position sensor 7, and a signal generator (not shown).

An enlarged view of an example of the image reading section 5 is shown in FIG. The image reading section 5 includes an image reading light source 8 and a photoelectric sensor 9.

The image reading light source 8 emits a plurality of image reading light beams having emission center wavelengths different from each other, and the position reading light source 6 emits a position reading light beam having an emission center wavelength different from the image reading light beams. The position sensor 7 and the photoelectric sensor 9 detect a position reading light beam and an image reading light beam, respectively.

As the image reading light source 8, as shown in FIG.
ED chips 10a, 1 (lb...IQz, green LED chips lla, llb...llz, and blue LED chips 12a, 12b...12z are made of a substrate made of glass, epoxy resin, phenol resin, etc. It is possible to use an LED array formed in a linear arrangement on the top.

The signal generator outputs a signal to sequentially turn on/off the plurality of image reading light beams and a signal to turn on/off the photoelectric sensor 9 in response to the signal to the image reading light source 8 and the photoelectric sensor 9, respectively. do. 1%J of the timing chart for the signal generator is shown in FIG. The timing chart shown in FIG. 4 will be explained by taking as an example the case where the above LED array is used as the image reading light source 6.

First, red LED chips 10a, 10b...1
A voltage Sr is applied to 0z, and the red LED chips 10a,
10b...1Qz lights up. At the same time as the voltage Sr rises, the photoelectric sensor 9 receives a reading start pulse Ps.
tll is applied and incident, and is converted into an electrical signal. The photoelectric sensor 9 sends the read signal 5out to the host computer l.
Output to. With the above steps, reading of the red component of the color original is completed. In the same way, green LED chips 11
a, 11b...41z and blue LED chip 1
2a.

12b, . . . , 12z are turned on, and reading by the photoelectric sensor 9 is started at the same time as these are turned on, thereby sequentially completing reading of the green component and the blue component of the color document.

FIG. 5 shows an example of the relationship between the wavelength and relative intensity of the image reading light beam and the position reading light beam, respectively. As shown in FIG. 5, infrared rays are used as the position reading light beam in the color image reading device of the present invention, and a pad 3 formed with a grid 13 made of a material that reflects infrared rays in the vertical and horizontal directions is used. The grid 13 is preferable in that it does not interfere with image reading. As the position reading light source 6, an infrared LED can be used.

[Effects of the Invention] According to the present invention, positional information of characters, figures, etc.
Reading the graphical i~・r image information 1 Width h<T
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t4゜! U

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of an example of a computer system equipped with a color image reading device of the present invention, FIG. 2 is a schematic diagram of the bottom part of the color image reading device of the present invention, and FIG. FIG. 4 is an enlarged view of one example, FIG. 4 is a diagram showing an example of a timing chart in a signal generator, and FIG. 5 is a diagram showing an example of the relationship between the wavelength and relative intensity of the image reading light beam and the position reading light beam, respectively. , FIG. 6 is a schematic perspective view of a conventional image reading device, and FIG. 7 is a schematic diagram of the bottom part of the conventional image reading device. 2... Color image reading device, 3... Pad, 6... Light source for position reading, 7... Position sensor, 8... Light source for image reading, 9... Photoelectric sensor, 10 ...Red LED chip, 11...Green LED chip, 12...Blue LED chip. Patent Applicant Rirashi Co., Ltd. Attorney Patent Attorney Ken Taken Figure 1 Figure 2 Figure 3 Figure 4 Time Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] An image reading light source that emits a plurality of image reading light beams having different emission center wavelengths, a photoelectric sensor that detects the image reading light beams, a signal that sequentially turns on and off the plurality of image reading light beams, and a signal that sequentially turns on and off the plurality of image reading light beams; A signal generator that outputs a signal to turn on/off the photoelectric sensor correspondingly to the image reading light source and the photoelectric sensor, and a position that emits a position reading light beam having an emission center wavelength different from that of the image reading light beam. A color image reading device comprising a reading light source and a position sensor that detects a position reading light beam.