JPS5821973A - Color original reader - Google Patents

Abstract

PURPOSE:To realize the miniaturization and a simple structure for the titled reader, by using a tight sensor and obtaining a color resolving signal by switching light sources. CONSTITUTION:A color original 1 is carried by an original feed roller 2 toward the arrow mark, and the secondary scanning is carried out. A tight sensor 7 is set tight to the original 1 or with a minute distance, and then the original 1 is irradiated from a composite LED array light source 3 and through the back side of the original. The light of the source 3 irradiates the original 1 attached tight to a transparent protecting layer 73 or set close to the layer 73 through an illuminating transparent window 75 drilled to a light shielding layer 72 of the sensor 7. The light of the source 3 is reflected by the original 1 and then received at a photoelectric transducer element train 74 consisting of many photoelectric transducers arranged in the main scanning direction vertical to the surface of the original.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compact color document reading device.

The configuration of a conventional device of this type is shown in FIG. In this figure, 1 is a color original, 2 is a document feeder, 31 is a white fluorescent lamp, 4L, 43, 44 are lenses, and so on. 1. $
2. Is is CCDJCD upper sensor, 61 is blue reflective dike p
Ik ξ lar, 62 is a red reflex make loiter l two.

In FIG. 1, a color original 1 is fed by the original feeder 2, and sub-scanning is performed by this. Color original 1 is illuminated by white fluorescent lamp 31 . First, the illumination light from the color original 1 is reflected and separated by a blue reflection mirror 61, where the blue component is reflected and separated.The reflected light of the separated blue component is reflected by the lens 4! by C
An image is formed on the CD line sensor s1, where it is photoelectrically converted and the blue color information of the color original 1 is read. Next, the red component of the light that has passed through the real reflection dichroic mirror 12 is reflected and separated by the red reflection dichroic mirror 12, and the red color information is similarly read by the CCDC line sensor. The light that has passed through the red reflecting mirror 62 has only a green component, and the green information is similarly read by the CCD line sensor IsK. As mentioned above, sub-scanning by paper feed K is performed in the direction of the arrow in FIG. 1, and each CCD line sensor s1 to
Electrical main scanning by SSK is performed, and the color original 1 is read.

However, in the above-mentioned conventional device, each ditaic mirror $1. A color separation optical system according to @2 is required, and each lens 42 to 44. Each CCD line sensor s1~s
Because three sets of s are required.

The disadvantage is that the device becomes larger. Also, lenses 42 to 48 for 3rd training. It is necessary to match the position of each color optical sensor by the COD line sensors i11 to lsK, which has the disadvantage that the adjustment becomes extremely complicated.

Fig. 2 is a diagram of a color original reading device showing another conventional example, in which 1.2 shows the same as Fig. 1, 82 and T8 are red and green, respectively, and the IEDID array light source 1 is a focused light source. The optical fiber lens array s4 is a thin film line sensor having a length comparable to the width of the document. K to make this work
As in the example of FIG. 1, red and green LED array light sources $2.33t are turned on alternately every fixed period of main scanning,
Each time each color LED is lit, the optical fiber 11 of the color original 1 connected on the thin film line sensor s4 is photoelectrically converted by the focusing fiber lens array 41, and information on the 10 colors of the color original is read. This example uses LgD as a light source, so it is smaller than the example in Figure 1, but the converging fiber lens array used in this type of device has a large chromatic aberration. This has the disadvantage that the Km image quality is greatly degraded. Further, the output of the color separation signals from this apparatus has the disadvantage that there is a time lag between them, making it difficult to output the color separation signals after the first order.

In order to solve these drawbacks, the present invention provides a color original reading device using a close-contact type sensor that does not require an external optical system and has no chromatic aberration, a plurality of light sources that emit light of different colors, and a delay circuit. By switching the light source, it is possible to simultaneously output color originals and color separation information regarding the same pixel on the reading cumulative surface in parallel.The purpose of this is to create a small and simple color original reading device. There are many things I can accomplish. Hereinafter, the present invention will be described in detail with reference to the drawings.

FIGS. 3 to 8 are diagrams showing an embodiment of the present invention.

FIG. 3 is a schematic diagram of the structure of the present invention, in which 1 is a color document, 2 is a document feeding roller, T is a contact type sensor, and 3 is a composite LED ID array light source.

FIG. 4 is an enlarged cross-sectional view of the contact type sensor 1 shown in FIG. A photoelectric conversion element row in which photoelectric conversion elements are arranged, 7s is an illumination light transmitting window.

Moreover, FIG. 5 is an enlarged cross-sectional view of the composite LED ID array light source shown in FIG.
s is a red LID array, 3e is a green Lm! iD array,
31 is a blue LED array. A large number of LEDs are arranged on a pedestal jig 38 in the direct main scanning direction.

FIG. 6 is a waveform diagram showing the timing relationship related to the present invention, where T is the main scanning timing.

is the lighting timing of the red LFiD7 Ray 3S, T8 is the lighting timing of the green L]1lD7 Ray $6, T4 is the lighting timing of the blue LED array 3T T1 is the red L
Color information successive tying under EDID array 3s, T
, is the color information successive output timing s when the green LID array 36 is lit, and TV is the sensuality reading timing when the blue LED array 31 is lit. Ta is the timing after the color information readout timing T passes through the delay circuit;
T- is the timing after the color information readout timing T passes through the delay circuit.

FIG. 7 shows the signal path of the present invention, where 10 is a scanning circuit of the writing type sensor, and 11 is an output terminal. I
f, 1B2 is a changeover switch, 83°I4 is a delay circuit, I
s is a color signal processing circuit.

Next, the operation will be explained. In FIG. 3, the color original 1 is fed in the direction of the arrow by the original feeding p-ra 2 to perform sub-scanning. Color document IKI with contact type sensor T! The composite L
The EDID array light source illuminates the color original 1, which is in close contact with or close to the transparent protective layer 73 at a very small distance, through the transparent illumination window Ts which is an opening in the light-shielding layer 72 shown in FIG.
liL, such a simple structure in which the light reflected from one color document is received by the photoelectric conversion element array T4, which is formed by arranging a large number of photoelectric conversion elements in the main scanning direction perpendicular to the sheet spacing, and photoelectric conversion is performed. Therefore, there is no color convergence in the contact type sensor T, and the image quality does not deteriorate even if a plurality of LED ID arrays emitting light of different colors are used.

Further, color separation is performed as follows. The main scanning timing TI is performed at a period t as shown in FIG. 6, and photoelectric conversion is performed during a period t1. First, the red LED array 35 is lit only for a period of time at one lighting timing T.

Under this illumination light source, at color information read timing T, tl
The reason why the lighting timing of the scanning line 1 is delayed by the period t4 from the lighting timing T of the scanning line 1 during the period K is that the delay in the optical response of the photoelectric conversion element in the contact type sensor T is taken into consideration. Similarly, green LI
The D array 36 is lit at the lighting timing T, read at the color information read timing T, and the color information signal under green illumination is obtained, and the blue LED array 3T is lit at the lighting timing T4.
The light is turned on, and the color information readout terminal 4 is read out to obtain a color information signal under blue illumination. After 5K, 3
Color-separated signals are obtained by color separation using color illumination. K like this
The color separation signals for each color obtained by
@#'r.

As shown in FIG. color separation signals regarding the same pixel are output simultaneously in parallel. That is, when the signal taken out from the output terminal 11 in FIG. When the signal is a color separation signal under green lighting, the selector switch -
Connect 1 to Slow *@SK, color information read timing T
After giving a delay corresponding to the difference between 6 and T, the selector switch 82 is connected to the color signal processing circuit j88IK, and the signal is sent to the color signal processing circuit $5.

If the signal output from the output terminal 11 is a color separation signal under red lighting, connect the changeover switches $1 and I2 to the delay circuits 1s and 114KI11, respectively.Therefore, the delay circuits 83 and 84 , color information read timing T
, and after applying a delay corresponding to the difference between
The signals are simultaneously output to the color signal processing circuit 85 in parallel as shown by #T@#T. It should be noted that the color signal processing circuit 85 has functions such as A/D conversion, encoding, and buffer memory as required, but since these have no direct bearing on the present invention, the details will be omitted.

Further, the writing sensor 7 scans as shown in FIG. FIG. 8 is a wiring diagram related to scanning, and shows 12. ．．
12. , . . . are common side electrodes, 13. .

133.・・・・・・is Boot King diode%1”
11141. . . . is a photoelectric conversion element e Is, which corresponds to the photoelectric conversion element row 74 in FIG. 4, 15. ,・
・・・・・・・・・ is the individual side buffer amplifier, 1・lsl
@lp... is a load resistor. Note that 10 is a scanning circuit and 11 is an output terminal, which are the same as those shown in FIG.

Photoelectric conversion element 141°148. For ・・・・・・, boot king diode 13□1 is installed to avoid interference.
3□... are 11 in series! The common side electrodes 121e121. ...
...2 individual buffer amplifiers 1slt IS! e・
...K connection.

K to scan this is first the common side electrode 12. A voltage is applied in the direction that the boot king diode conducts between the common electrode 12. Select the charging conversion element block connected to. At this time, the voltage corresponding to the change in photoresistance of the photoelectric conversion element is applied to the load resistor "t, 1 @ 1.
・Appears on both ends of. This is connected to the individual side buffer amplifier 15.
, 15t, . ,...
... are sequentially switched and outputted to the output terminal 11.

Hereinafter, common side power 1i12. ．． 12m...
By applying a voltage to and repeating the same scanning, all pixels of the scanning line are scanned. Of course, this is one example of a scanning method, and it is well known that there are various other methods, such as setting a switch for every bit or driving the switch with a shift F register.

In addition, in the description of the above embodiment, the light sources are red and green.

Although we used a three-color blue LID array, it is of course possible to configure it using other colors or changing the number of colors, and the type of light source can also be fluorescent lamps other than LEDs, electroluminescent lamps, etc.
It is also possible to use a netsense board or the like.

As explained above, this invention uses a contact type sensor,
Since the color separation signals are obtained by switching the light sources, the apparatus has the advantage of being compact and having a simple structure without the need for complicated adjustments. In addition, since the contact type sensor has no chromatic aberration, it is possible to output color information signals related to the same pixel on a color original in parallel at the same time, since 5K is used to adjust the time difference between the two pixels. The advantage is that it can be done easily. therefore,
If this invention is applied to a color combing device, a small and simple color 77 combing device can be constructed.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the configuration of a conventional color document reading device;
3 is a schematic diagram of the configuration of another conventional color document reading device, FIG. 3 is a schematic diagram of the configuration of an embodiment of the present invention, and FIG. 4 is an enlarged sectional view of the contact type sensor shown in FIG. FIG. 5 is an enlarged cross-sectional view of the multiple LID7 ray light source shown in FIG. 3, FIG. 6 is a waveform diagram showing the tie/flash relationship related to this invention, and FIG. 7 is a signal path diagram of this invention. FIG. 8 is a wiring diagram related to scanning according to the present invention. In the figure, 1 is a color original, 2 is a document feeding roller, 3 is a metal LBD array light source, T is a contact type sensor, 10 is a scanning circuit, 11 is an output terminal, 3s to 3T are LΣD7 rays, 71
is a transparent substrate, T2 is a light-shielding layer, Ts is a transparent protective layer, 14 is a photoelectric conversion element array, Ts is an illumination light transmission chamber, @1 and 12 are changeover switches, $3.84 is a slow circuit, and s5 is a color This is a signal processing circuit.

Claims (2)

[Claims] (1) A plurality of primary color illumination light sources emitting light of different colors, an optically transparent substrate, and an optically opaque light-shielding layer that is an electrically poor conductor formed on the substrate;
A transparent window for m5jl formed in this light shielding layer, a photoelectric conversion element array formed on the light shielding layer in the vicinity of this window, and a transparent protective layer disposed to cover at least the transparent window and the photoelectric conversion element array. 1. A color original reading device comprising: a one-piece image sensor; and means for extracting color signals in parallel corresponding to the plurality of primary color illumination lights having different emission colors. (2) The means for extracting color signals corresponding to a plurality of primary color illumination lights in parallel is provided during a certain period of main scanning and when the reflected light from the color original of each color light source of the primary color illumination light source to be turned on next is incident. 2. A color document reading device according to claim 1, further comprising a delay circuit that applies a predetermined delay to each color signal obtained from the photoelectric conversion element array and simultaneously outputs the signals in parallel.