JPS58103267A - Reading system - Google Patents

Abstract

PURPOSE:To obtain a large output with high image resolution even in case the sufficient luminance is not obtainable on the photodetecting surface within an image pickup element, by securing the correspondence between the feeding speed of an original picture and the transfer speed of the electric charge in the image pickup element. CONSTITUTION:An image pickup element 20 contains a photodetecting transfer part 21 where CCD 31-34, etc., use both as the photodetecting parts and transfer parts are arranged and an output register 22 where the CCD 35, etc. are set in one train. The output is extracted via an amplifying part 23 for the element 20. The pitch Pc between CCDs is set so as to satisfy Pc=mPd, where Pd means the scanning line pitch of an original 1 and (m) is the magnification ratio of a lens 2, respectively. At the same time, for the CCds within the element 20, the element 20 is set so that the transfering direction of the electric charge is coincident with the direction where the original picture shifts on the element 20. In such a way, a large output is obtained with high image resolution without accelerating the reading speed even in case the sufficient luminance is not obtainable on the photodetecting surface within the element 20.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Corner @ 0 technical field This shield is a field for reading original characters in a reading device such as an optical character reader (OCR) with a large output with a good degree of resolution. It is related to the method.

Detective) Prior art Conventional 11! In the collecting device, as shown in Figure 111, the original species 1
From the above image, an image sensor 3 consisting of nine charge-coupled devices (hereinafter abbreviated as KCOD) arranged one-dimensionally through the lens 2
The p% waterfall scan 11100WR is loaded by photoelectrically converting the light entering the image sensor 3 and converting it into electrical output, and then the raw material 1 is transferred to a predetermined O-travel f- by a transport system (not shown).
(transfer in direction A by pitch Pd), read next scan [11. A method is used in which OIA is removed from the entire surface of the p original material 1 by returning the above operating sound m.

In this case, the output of the image sensor 3 is proportional to the illuminance toward the image sensor 30 and the charge Oas < time difference O product generated by photoelectric conversion. The output will drop and the reading p will be affected.

If ζO1a is used, the charge accumulation time may be affected or 82
As shown in the figure, the dimensions of the light receiving part 40 of the image sensor are
It is necessary to increase the output by increasing the amount of incident light by making the moving direction BK of the m image much hotter. However, in the case of both numbers, the speed of the original thread*n is not uniform, and in the latter case, there is a drawback that the resolution in the original thread direction p is degraded.

(3) Purpose of the Invention The purpose of the present invention is to provide a tIt stacking method that obtains a good resolution I[) input power output without disturbing the g-speed storm even when the directivity of the image sensor is insufficient. That's true.

(4) Structure of the Invention Ninth to achieve the above-mentioned objective, the reading method of the present invention is a
In the reading device that irradiates the UI on the scanning f- with light and forms an image on the image sensor using a lens, a two-dimensional image sensor that transfers a single line of light receiving sections parallel to multiple lines is used.
The pinch Pa of the light receiving station that performs line transfer is made equal to the product of the original lateral scanning line pitch Pd and the lens magnification m, and the direction of movement of *mm+exp. Arranged so that the charge transfer direction is the same, and the d & image element internal O
The transfer of electric charge is considered to be a threat to mold.

(5) Embodiment of the Invention FIG. 5 is an explanatory diagram of the configuration of an image sensor which is a main part of the invention. The image sensor 20 in the figure is a C
0D51 to 54, etc. are multi-Mx light receiving and transferring unit 21, and C0
Output register 22 with D55 etc. lined up in a row,
Output is taken out via amplifier 25t. The pitch Pa of each CCD threshold is selected so as to satisfy the relationship PO-m-Pd, assuming that the original seed 1's scanning pitch 'fcPd' and the lens 20 have a magnification of 7 m. Also, each C in the photo 1*1g child 20
In OD, the direction of electric #t-transfer and the original species II on the image sensor 20! The image sensor 20 is arranged so that the direction in which I and I move is the same.

Figure jI4 is an explanatory diagram of the configuration of an embodiment of the present invention.

As shown in the figure, its configuration is the same as that of FIG. 1 except for the use of the image pickup device 20t of the present invention shown in FIG. 3. Here, by using the image sensor 20, p1, the image sensor 2,
#Movement direction fl:ccD of the original image above 0 has the same transfer direction and the movement timing is the same. Even though the source is moved horizontally by using VC, the photoelectric conversion and charge accumulation time at the same location of the source is substantially increased, which deteriorates the resolution. 11! (3) Relation IILt - It is possible to increase the output without making it uniform.

Figures 5 (a) to (C) are detailed explanations of the wt-taking operation of the embodiment of the invention. FIGS. 6(JL) to (C) are waveform diagrams of the waveforms.

In E% (a), imaging 1 on original [ID chemotaxis-10
2, charges corresponding to the amount of illuminated incident light are accumulated in the light receiving section 31 on the image sensor 20. Then 1W
As shown in llI111Φ), the nine charges accumulated in the light receiving part 61 are transferred to the light receiving part 1152, which is pl-iso, by the charge transfer command paddle shown in JIE6111d(b), and at the same time, the original #41 is connected to the transport system (not shown). By using the Haramaki feed j1 command pulse shown in FIG. 6(a), the scanning line is sent by the scanning line pitch Pd.

Then, as shown in IIgl((+), the light receiving section 32
The second O charge accumulation is performed at 6. In this case, Pc
= mxPd = 6 O = original o corresponding to light receiving unit 5211C
In FIG. 5 (JL), the uau transmission corresponds to the light receiving section 51 and the charge of the same image is accumulated in the light receiving section 52.

The amount of charge accumulated in f#9 in the light receiving section 32 is
is equal to the amount of charge accumulated in . In this case - in the scanning direction! There is no deterioration of the S image, and the amount of accumulated charge is doubled. Even if the light receiving part 55 or 54 does not have lWI, the light receiving part 31
Since the charges in the same figure as when accumulated in , are accumulated additively,
In terms of IIk#I, four times the amount of charge accumulated in the light receiving section 31 is accumulated. As shown in FIG. 5, this means that the charge transferred from each CCD column to the output register 22 is 1
11.6 As shown in FIG. 6(C), the amplified pulse is continuously outputted as an output of 1 horizontal scan + 110 by the head setting pulse.

In this way, the charge accumulation time can be substantially quadrupled without increasing the speed of the original cell, so the output can also be quadrupled, resulting in $1 cost savings.

(6) To explain the invention in detail, according to the present invention, a line transfer type 02-dimensional image element is used as a continuation MiL element, and an original +141
By matching the transmission speed of the image with the transfer rate of illuminance within the image sensor, even if sufficient illumination of the light receiving surface within the image sensor cannot be obtained, the reading speed can be maintained without slowing down. ,
You can get a good output with good resolution.

In the embodiment, the number of pixels to be transferred in a line is 4 and 9, but there is no membership fee to limit it to this. The same effect can be obtained with either the Makuhara Fukusen Le Hiroseki Kasen 9 or the continuous transmission P as long as the speed of the original material and the charge transfer speed of the image pickup device correspond to each other.

[Brief explanation of drawings]

Figure Jil1 and Figure 712 are the conventional example and the construction theory of the main part, respectively, and Figure #I5 is the construction theory of the embodiment of the main part of the present invention]. In the figures, 1 is the original, 2 is the lens, and 10.11 is 12 is a scanning line, 20 is an image sensor, 21 is a light reception and transfer unit, 2
2 is an output register, 23 is a stage meter, 31 to 65 are CCDs
shows. Tokidende Kato Fujitsu Ltd. Kashiro Gakujin Bentsushi 1) Fu Saka 1 Figure 1 Figure 2 rr' 3 1 shi 1

Claims (1)

[Claims] WItsiL vehicle odor device, which irradiates an image on a trout with one scan of g/Xs and forms the image on a lens with a lens, 12
2 Transferring multiple light receiving sections by 11 lines
Using a three-dimensional image sensor, the pitch between the light receiving sections for line transfer is selected to be equal to the scanning line pitch Pd of the original and the magnification m of the lens, and the original pail-image on the image sensor is The m-transfer method is characterized in that the moving direction of the line-transferred charges is the same as the moving direction of the line-transferred charge, and the O-charge O-transfer within the imaging probe is carried out in accordance with the tying of the original species No. 1III.