JPS586663A - Appressed type image sensor - Google Patents

Abstract

PURPOSE:To enable one appressed type image sensor to read different colors separately by arranging two arrays of photoelectric converting elements a side of transparent window arrays, and providing each converting element with a blocking electrode. CONSTITUTION:A light-shielding layer 26 is provided on a transparent substrate 22 except transparent window arays 23, 24 and 25. Photoelectric converting element arrays 27 and 28 are provided among the transparent window arrays. Each photoelectric converting element is provided with a blocking electrode, and a lead electrode is led out. They are covered with a transparent protective layer 31. An original P is placed on the transparent protective layer 31 and lighted succeessively by light sources 41, 42 and 43 for red, green and blue from the transparent substrate side. According to lighting states of the light sources, either of the photoelectric converting element arrays 27 and 28 is blocked with blocking electrodes to obtain pieces of color information on red, green and blue successively. Thus, one image sensor reads those colors separately.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a contact type image sensor K1m for a color flip-flop transmitter that can be easily constructed.

As everyone knows, Color 7 Axis! The transmitter uses a means to scan a document in the same way as a normal 77 comb, divides the scanned signal into three primary colors (red, green, and blue), and sends these three signals to the transmission line VC, A means of transmitting by division, W4 wave number division, etc. is required.

Figure 1 shows a conventional color fusing device.
1 is a document drum, 2 is a synchronous motor, 3 is a lens, 4 is a red buoy, a filter, and 5 is a green filter.

・ is a blue filter, T is a photoelectric conversion element, 8 is a switching device,
Reference numeral 9 denotes a half mirror 110, a light source; and 11, rotation.These operations rotate the document drum 1 with a synchronous motor 2, and illuminate the document wound on the document drum 1 with a light source 1o. Then, the reflected light is divided into three by 8-] fuller filter, and each divided by 4 red filters. Green fill jF5. True color filter 6
T! - By passing the light signal on the document is separated into three primary colors. Further, each color signal is converted into an electric signal according to each color signal by a photoelectric conversion element 7 provided in each. Furthermore, these signals are parallel.

For serial conversion, the signal is switched by the switching device 1, then modulated by the modem device 12 and sent to the line 11.

However, in such a conventional color 7 axis device, three photoelectric conversion elements T are required, and three lenses are required.
．． Since it uses an 8-F Sr, it has the drawbacks of being large and having low sensitivity.

This invention aims to eliminate these drawbacks.

It is characterized by the ability to separate three colors or multiple colors with one image sensor without using lenses or half-colors,
We aim to provide a small and simple color facsimile transmitter. This invention will be explained below.

FIG. 2 shows how an embodiment of this invention is used.
Reference numeral 21 denotes an image sensor of the present invention, which corresponds approximately to the width of the color original P by IK, and the photoelectric conversion system can read the original as written without requiring an optical system such as a lens. 41 is a red light source.

42 is a green light source, 43 is a blue light source, and the image sensor 2
The color original Pv is illuminated from the back side of the image sensor 21, and the reflected light from the color original P is captured by the photoelectric conversion elements arrayed sVc in the image sensor 21.

The original is read by photoelectric conversion. less than.

The configuration, operation, and driving method of the image sensor 21 of the present invention will be sequentially explained.

FIG. 3 is a sectional view of FIG. 2, which is an embodiment of the present invention, and FIG. 4 is a plan view of the same. A row of transparent windows (hereinafter sometimes simply referred to as transparent windows) 2L is arranged on a transparent substrate 22 such as glass.
24, 2! A light-shielding layer 2@ made of a material with electrically poor conductivity is provided except for the transparent window rows 23 and 14, and a photoelectric conversion element row ( 27.2@ (hereinafter also simply referred to as photoelectric conversion elements) are formed discretely. Blocking Dami Kiwami 2
s is a material that makes boot-king contact (diode action) with each photoelectric conversion element 2L211, and each photoelectric conversion element 27 is formed so that one end or a wire (the right side or the left side of the 411th side) is in contact with the column direction. Similarly, each photoelectric conversion element 211 is formed in contact with the opposite end or one end of the photoelectric conversion element 27. The lead electrode 30 is made of a material that makes ohmic contact with the photoelectric conversion elements 27 and 28,
The boot king electrode 2- of the JJt electric conversion element 2T and the other side opposite to the boot king electrode 2- of the photoelectric conversion element 28 are made common, and the boot king electrode 2s of the photoelectric conversion element 2- and the photoelectric conversion Boot king electrode 2 of element 2T
The other side, which is the opposite side of I, is shared, and each is drawn out. and.

The photoelectric conversion elements 27 and 211 are entirely covered with an optically transparent transparent protective layer 31.

Here, the blocking electrode 21. If the material of the photoelectric conversion element 27.211 is Cd8, the material of the lead electrode 30 is the boot king electrode 29vAu, and the lead electrode 30
vIn, or if the blocking electrode 29 is T., the lead electrode 30 is AI or the like. Photoelectric conversion element 27.2
Even when the material of 1 is Cd8, the electrodes may be made of the same material as in the case of Cd8. In addition, the thickness of the transparent protective layer 31 needs to be within the pitch width of the photoelectric conversion element array 27 in order to obtain resolution. There is coating of transparent polymer material, 81
Application of varnish.

It can be formed by a method such as pasting a thin sheet of glass. Of course, the light-shielding layer 26 may also be formed by covering a conductive light-shielding layer with an electrically non-conductive material.

Next, the operation will be explained.

To read a color document P, first, only the red light source 41 is turned on, the color document P is illuminated through the transparent window 23, and the red reflected light from the color document P is captured by the photoelectric conversion element 2T and photoelectrically converted. Next, only the green light source 42 is turned on, and the color original P is captured by one of the illumination elements 2I through the transparent window 24 and photoelectrically converted.

Obtain green color information of color document P. Finally, only the blue light source 43 is turned on, and the color original P is illuminated through the transparent window 5. One reflected light is captured by the photoelectric conversion element 2@ and photoelectrically converted to obtain blue information of the color original P.

In this way, the red light sources 41.corresponding to the transparent windows 23.24.25. Enshoku party source 4! , the blue color source 43 is sequentially turned on, and the charge conversion element 27, 211 is selected, the color information of the color original P can be obtained from k.

Here, the one-element electric conversion elements 2T and 28 do not need to be made of the same material; if one is made of C1B, which is sensitive to short wavelengths, and the other is made of CdS, which is sensitive to long wavelengths, red, green, etc. It is possible to configure the image sensor 21 with good km degrees for all blue colors. Moreover, it goes without saying that the lighting position and arrangement of each of the light sources 41 to 430 may be determined arbitrarily. The size of the transparent rows 23 to 25 can be determined by considering the sensitivity of the photoelectric conversion elements 27, 28, etc., and does not necessarily have to be the same thickness.

Next, a method of selecting and driving each of the photoelectric conversion elements 27 and 211 will be explained.

Figure 5 shows a drive circuit for a 16-bit photoelectric conversion element.

FIG. S is an example of a time chart for explaining the operation.

In Fig. 5, %RAI~R1□# R11~R1, are photoelectric conversion elements, and the charging conversion element row 21 in Figs.
and 21, the resistance value changes depending on the amount of captured light. 011~DAII * Dmt~Dll@ is a Plotskinder diode F, which is formed by contact between the photoelectric conversion element 27, 28 and the boot king electrode 2s, and the group 0□ and the group O1 are opposite in the forward direction. are doing. S
□, S□ are common electrode changeover switches s S11 e S
冨 and Scs are power supply polarity changeover switches, SCI to Scs are individual electrode changeover switches, and E is a power supply. Note that RL represents a load resistor, and ■• represents an output voltage.

Next, the operation of the drive circuit shown in FIG. 5 will be explained with reference to the time chart shown in FIG. 6.

yt, k to select the column of IE conversion elements RAI to RAS-
teeth.

Turn on Smi and make the power supply polarity positive. This causes the row of Booking diodes DAI to DA to become conductive and select the Booking diodes Dis to D.

The column becomes non-conductive and becomes non-selected. For driving, turn on the changeover switch S□ as shown in Figure S, and turn on the changeover switch SC.
Turn I to SCS sequentially to 0N-OFFL-Cc%, then turn off the changeover switch S□, and turn off the changeover switch S.

0NKL, and similarly, by repeatedly turning the changeover switches Scs to Sc- ON and OFF sequentially, the rows of photoelectric conversion elements Rm1 to R^2 can be scanned.

Next, to select the row of photoelectric conversion elements Rmt-Rat-, set the selector switch S□ to 0FFKL, selector switch 5itYO
If N and the power supply polarity is negative, then the gooking diodes OA1~0mui・ are non-conductive, O11~O1&,
When becomes conductive, it is done by and. Photoelectric conversion element R11
The scanning of the column ~R1* is similar to the scanning of the column of photoelectric conversion elements RA1~Rm, -.

This method can be driven in the same way even if the number of photoelectric conversion elements 27 and 211f) II increases, and red, green, and dorsal color light sources 41 to 4
0N- according to the time chart shown in 3v No. 6
By applying 0νF, color signals of each color can be extracted. In addition, v and l in FIG.

V(1@# vos indicates the output voltage of red, edge, and back.

This invention provides a Taheren lens having the configuration described above.
^-) It is possible to separate three colors with one image sensor 21 without using a ξ color, and a small and simple factor transmitter can be constructed.

FIG. 7 is a sectional view of another embodiment of the invention, and FIG. 8 is a plan view thereof. This embodiment also makes it possible to separate two colors. That is, a light-shielding layer 26 is provided on a transparent substrate 22 such as glass, except for the transparent window rows 28 and 25, and a transparent layer 26 is provided on the transparent substrate 22 such as glass. Photoelectric conversion element rows 27 and 28 are discretely formed on the light shielding layer 2@ between the window rows 23 and 25. Plotskinder electrode 2
1. Lead electrode 30. The transparent protective layer 31 is similar to the embodiment shown in FIGS. 3 and 4. s2. ss is a color filter having mutually different characteristics, and 34 is a luminous flux of white light In.

Next, the operation will be explained.

dark filter s3. It is illuminated by the light beam 34 that has passed through the transparent window 23, and at the same time, the light beam 84 from the white light 1[k passes through the five-color filter 3 and the color filter 33 with different characteristics. be done. The reflected light from the color original P is captured by the power converter elements 27 and 21 and photoelectrically converted into image signals of the respective colors. Here color filters sx, ss
When separating black and red, there is a combination of a total transmission filter and a red transmission filter, a green passage filter, and a red passage filter. The photoelectric conversion element rows 27 and 21 are.

C10, which is sensitive to short wavelengths, and Cd, which is sensitive to long wavelengths.
When 8. etc. are combined, the reproducibility of one color becomes better than that of k. Further, the light source is a red light source 41, similar to the AM example shown in FIGS. Green party source 42, blue light 1148 2
Of course, there are four things that can be done by setting the seeds, turning them on at the same time, or blinking them. The driving of the embodiment shown in #Eγ diagram and FIG. 8 is as follows.
This is similar to the Lf7 embodiment shown in FIGS. 3 and 4.

FIG. 9 is a cross-sectional view showing still another embodiment of the present invention. The 10s is also a plane, and the image sensor 4h of the embodiment and the two colors are separated and meet. That is, a transparent window row 23 is provided on a transparent substrate 22 such as glass with a light blocking layer 21%, and photoelectric conversion element rows 21, 2 electrodes are formed, and the pushing electrode 2* and the lead electrode 3P are formed as the third electrode.
It is provided in the same manner as the embodiment shown in FIGS. Color filters 32.33 having different characteristics from each other are provided on each of the photoelectric conversion element rows 27.2a, and a transparent protective layer 31 is provided thereon in the same manner as in the embodiment shown in FIGS. 3 and 4. Provided in the following manner. Note that the color filters 32 and 33 are made of gelatin filters or interference filters, and are connected to the photoelectric conversion element array 2.
7.2! It is clear that if direct IK coating or vapor deposition is not possible, the photoelectric conversion elements 27 and 28 may be protected by a transparent protective layer 31 of several μm and 11° C. and then formed.

Also, what are the characteristics of the different color filters 32 and 3S?

It may be similar to the embodiments shown in FIGS. 7 and 8 above.

Next, *g* about the action.

In the 111th step, the color original P is illuminated by the light beam 14 from the white light source that has passed through the transparent window 23 . and,
A portion of the light reflected from the color original P.

A part of the wavelength of the reflected light passes through the color filter 32 and is captured by the photoelectric conversion element 21, and another part of the reflected light from the document P passes through the one-color filter 33 and is captured by the photoelectric conversion element 21. It is captured by the photoelectric conversion element 211.

The image signals of each color are obtained by driving according to the driving method shown in FIG. 5, 811wc.

In each of the above embodiments, the photoelectric conversion element array is
1#) Two rows were set up, but these two rows are two groups, and in reality, there may be as many as there are. Further photoelectric conversion element rows may be provided on the upper side and the lower side, but when connected, the rows are in two groups. Furthermore, in each of the above embodiments, the two photoelectric conversion elements 2T and 2@ are drawn out in common by the replacement electrode 30. You may also connect it externally.

As explained above, the present invention is applicable to a contact type image sensor in which photoelectric conversion element arrays are arranged on a transparent substrate, a document is illuminated from below, and reflected light is received by the photoelectric conversion element array. Multiple arrays.

Two rows of photoelectric conversion elements are arranged on both sides of the transparent window row and/or between them, and a boot king electrode is formed on each photoelectric conversion element, and a KL is used to draw out the photoelectric conversion elements with lead electrodes.
, Since the configuration is such that these t can be read out independently, multiple colors can be read out separately with one image sensor, and the number of separations of one color due to the element density of the photoelectric conversion element is
It also has manufacturing advantages since it does not need to be expensive. As a result, it is possible to construct a small and simple color transmitter. Further, since the thickness of the transparent protective layer is made thinner than the interval between the photoelectric conversion elements, the degree of decomposition can be increased. Furthermore, since the lead electrodes are drawn out in common to the two rows of photoelectric conversion elements, a simple configuration can be realized. Furthermore, since two color filters are provided on the transparent substrate or the photoelectric conversion element array, it has many advantages such as being able to operate with a white light source.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional color puff pastry device, and FIG. 3 is an illustration of an embodiment of the present invention. 3 is a cross-sectional view showing an embodiment of the present invention, 4111 is the same plan view, and FIG. S is the same (drive circuit diagram). The first part of the charge is a sectional view showing another embodiment of the invention, FIG. 8 is a plan view, and FIG. 9 is a sectional view showing still another embodiment of the invention. In the figure, 21 is an image sensor, 22 is a transparent substrate, 23.24.2% is a transparent window row, 26 is a continuous light layer, 1T, 1
@ is a photoelectric conversion element array, 2- is a blocking electrode, sO is a lead electrode, 31 is a transparent protective layer, 32.33 is a color filter, 34 is a luminous flux from a white light source, 41 is a red light source, 42
43 is a green light source and 43 is a blue light source. Figure 1 Figure 2 Figure 3 Figure 4 Factor q

Claims (1)

[Claims] h) A document is placed on the side of a photoelectric conversion element array arranged on a transparent substrate, and the document is illuminated from the surface of the transparent substrate opposite to the document, and light reflected from the document is illuminated. In an image sensor that performs photoelectric conversion by capturing images, an optical layer made of an optically opaque and electrically poor conductor material is provided on the transparent substrate, and a transparent layer for illumination is provided in the optical layer. Discrete window rows or slit-like <1 row or multiple rows provided. 4) Photoelectric conversion, wherein the photoelectric conversion element rows are discretely formed in two rows on both sides of the transparent window row and/or between them, and a boot king electrode is installed at one end of each of the six electric conversion elements. Lead electrodes are drawn out from the other end of the element and each of the boot king electrodes, and are further formed on the transparent substrate on the side of the photoelectric conversion element row l! A close-contact type image sensor characterized by having a portion covered with an optically transparent transparent protective layer. Claim (1) characterized in that the thickness of the voltage-protection layer is thinner than the mutual spacing between the photoelectric conversion elements.
Close-contact image sensor as described in . (B) In the multi-row ICj# photoelectric conversion element array, a boot king electrode is formed at one end of each photoelectric conversion element in one row on the same side in the column direction, and a boot king electrode is formed at one end of each photoelectric conversion element in one row on the same side in the column direction. A boot king electrode is formed at the other end on the same side in the column direction, and the boot king electrode of the photoelectric conversion elements in one row and the opposite end of the blocking electrode of the photoelectric conversion elements in the other row are respectively made common. In addition, the lead electrodes were drawn out by making the boot king electrode of the photoelectric conversion elements in the other row common to the opposite end of the boot ring/dummy pole of the photoelectric conversion elements in one row. Characterizing Claim No. (1)I
Calligraphic image senna described in I. (4) The transparent substrate is transparent W! Lower Kq corresponding to column 41I
Claim (1) Ring 7! characterized by comprising two types of color filters with different properties! (5) A patent characterized in that the 'yt electrical conversion element array is provided with two types of color filters with different characteristics on its upper part. A dense type II image sensor according to any one of claims (1) to (3).