JPS5961267A - Reader of color picture - Google Patents

Abstract

PURPOSE:To read out a color picture with improved by dividing reflected light from an original surface and guiding the divided light rays selectively to image sensors formed in rows of three. CONSTITUTION:The original surface 1 of a color picture is irradiated by the light from a light source 2 through a lens 3 and the reflected light 4 focused by lenses 5, 6 and made incident to a prism 7. Respective color light rays, red, green and blue, divided by the prism 7 are made incident to transparent electrodes 25a, 25b, 25c on an image sensor 8. The change of optical electromotive force corresponding to the quantity of red, green and blue light rays is generated on three rows of the electrodes 23, 25a-25c corresponding to picture elements which are connected to a photoelectric conversion film 24 formed on the lower parts of respective electrodes 25a-25c and a reading-out line 23. If a capacitor of each photoelectric conversion area is charged through the electrodes 23, 25a- 25c and then discharged in accordance with the change of optical electromotive force, an output corresponding to the color picture is read out.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an apparatus for comfortably reading a single color image on a document surface.

[Technical background of the invention and its problems]

Conventionally, devices that convert color images into electrical signals and read them are
Separate the colors of the reflected light from the document surface using a color filter and take a picture 1
Generally, it is guided to a solid-state imaging device such as a quadrant or CCD.

However, with this method, the light loss in the color filter is large.
/N. Because it requires a color filter that is highly detailed and has a high color quality, it has become a commercial item in terms of price.

[Purpose of the invention]

The purpose of this invention is to provide two images without using color filters.
The object of the present invention is to provide a color image reading device which can read both color images at -1''1 sensitivity and has a good S/H reading output with an inexpensive configuration.

[Summary of the invention]

This invention has a dot-shaped C'e-
An image sensor in which at least three rows of conversion areas are formed.
3. On the other hand, the reflected light from the document surface is divided by a prism y(l, t), and the resulting light of at least three primary colors is guided to the photoelectric conversion area of each column of image 7 → F, and half・) It is characterized in that the amount of charge change i 111f'i is detected and the color image on the original surface is read.

〔Effect of the invention〕

According to this invention, a prism is used as a transparent body with extremely low light loss compared to color filters, etc., as a means for dispersing the residual elements from the document surface that are introduced into the image sensor. Carefully read the image on the screen, S
/N good reading output +++i can be obtained.

In addition, prisms have a finer shape than color filters with pixel-corresponding patterns and do not require high apertures, so they are advantageous in terms of cost, and alignment with image sensors is also easier than with color filters. It becomes easier.

FIG. 141 is a schematic diagram of a color image reading apparatus according to an embodiment of the present invention. In FIG. ζ, reference numeral 1 denotes a document surface on which a color image is to be formed, and is illuminated by light from a light source 2 through a lens 3. Reflected light 4 from the illuminated document surface 1 5.6
The light is focused by the beam and enters the prism 7. The light beams separated by the prism 7 are guided to the image sensor 8.

The detailed structure of the image sensor 8 is shown in FIG. In FIG. 2, reference numeral 21 denotes a substrate, on which a pixel-corresponding electrode 22 is formed.

m+X compatible bipolar 22 is 22a, 22b, z2c (1
) are connected in common, three at a time, and connected to the readout line 23. Then, the photoelectric conversion 1i is placed on the pixel corresponding electrode 22.
fi 24 is formed, and on top of it there are 3 boxes 0) 9 light box "Mf, 25, a, 2.5 b, 25 c
It is formed in a direction perpendicular to the iBj'i corresponding electrode 22.

That is, @A+22 and transparent tiz5 a, 25
b.

At the intersection with 25c (above 22a, 22b, and 22c), dot-shaped conversion regions are formed in three rows as a whole. In this case, each photoelectric conversion region has a gap between the pixel corresponding electrode 22 and the transparent conductive films 25a, 25h, and 25c.
10 Archetype transformations that are the guiding “ME material” or the originating force material
Since 24 is in a sandwiched shape, both the nine electric transformers and seven act as capacitors, that is, they have a charge storage function.

Therefore, as shown in FIG.
, Kentun 13 are each transparent 'mountain 1N! 25a, 25b
, 25c, if the positional relationship between the prism 7 and the image sensor 8 is set so that the light is incident on 25c, 9% 25 a , 2
3 formed at the bottom of each of the 5 b and 25 c nosoles.
The photoelectric conversion areas of the columns are red light J1 and green light 12, respectively.
, W@, the amount of light (responsive change in resistance or) Celsius causes a change in electromotive force. Thus, for example electrode 23.25a
.

After charging the capacitors in each charge conversion region through 25b and 25C, discharging is performed for a certain period of time according to the change in resistance or the change in the original force, and then charging is performed again. Since the charging chamber which compensates for the decrease in charge is destroyed, this current change is reflected in the electrodes 23 and 25.
If the voltage changes are detected sequentially through a, 25*r, and 25C, red and W corresponding to the color image on the document surface 1 are detected.
, you can get a green readout.

In this way, according to the invention Cζ, it is no longer possible to read a color image without using a color filter.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a color image reading device according to an embodiment of the present invention, and FIG. 2 is a bottom view showing the structure of an image sensor section in an example of pretext MQ. 1... Original surface, 2... Light source, 4... Reflected light, 7.
- Prism, 8... Image sensor, 11... Red light, 12... Green light, 13... Blue light, 21...
Group +iv, 22... Pixel corresponding electrode, 23... M, output electrode, 24... Original rod conversion film, 25a, 25b, 25
C...Transparent electrode.

Claims (2)

[Claims] (1) An image sensor in which at least three rows of dot-shaped light weight conversion regions having electric charge, i':9) jl: are formed, and the reflected light from the document surface is separated by a prism, and a few l, Means for selectively guiding at least the three primary colors to the light weight and conversion area of each column of the previous MII' image sensor (! 1. A color image reading apparatus, characterized in that the color image on the surface of the original 5 is read. (2) The image sensor is configured by providing an original transformation tla between pixel-corresponding electrodes arranged in parallel and at least three transparent electrodes formed in a direction orthogonal to these pixel-corresponding electrodes. 2. A color image reading device according to claim 1, wherein the intersection of the electrodes is a dot-shaped original transformation area.