JPS6133072A - Reading device - Google Patents

Abstract

PURPOSE:To avoid the omission of picture elements by setting the picture element width at the end part of a line sensor at the value smaller than that at the areas excepting the end part of the line sensor. CONSTITUTION:Plural line sensors 18 are arrayed on a straight line, and the width of picture elements 1101 set at both end parts of the sensor 18 is set smaller (e.g. 1/2) than that of picture element 11 at the areas excepting both ends of the sensor 18. Therefore an amplifier having double gain is provided between the element 1101 and a gate 13. Thus an equal level is secured among signal outputs, and these outputs are sent to a transfer stage 14. Then it is possible to avoid the omission of picture elements while the width produced by recesses/projections 22 of a cut part of the sensor 18 is maintained.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a reading device used, for example, in a facsimile machine, which converts image information such as a document into a time-series electrical signal, and particularly relates to a reading device used in the reading device. 00D (Ohharge
0upledDevice).

[Technical background of the invention and its problems]

An IC sensor, such as a CCD sensor, used in a reading device is manufactured on a silicon wafer through a PEP process, and the sensor length is limited by the wafer size. Therefore, conventionally, a reading device that reads normal originals (A4, B4 size, etc.) at the same magnification is configured by arranging a plurality of CCD sensors.

In the reading device, the arrangement of CCD sensors, etc. is as follows:
The most common method is to arrange them in a straight line. However, when arranged in a straight line, CO
The unevenness of the cut surface at the end of the D sensor cannot be ignored with respect to the size of the pixel, and there are places where there are no pixels at the joint between the CCD sensors. In other words, CC
There is a risk that characters, etc. cannot be read at the connection part with the D sensor. In fact, when the image density is 16 pieces/dragon, the image pitch is 62.5 μm, whereas the unevenness of the cut surface is at least 1
Since it is about 0 μm, 1 at the connecting part between the CCD sensors.
Missing pixels is inevitable.

In order to avoid the above-mentioned danger, for example,
Figure 3 disclosed in Publication No. 64 or JP-A pKr
c There is one set to be placed. However, when this method is used, the reading positions of the CCD sensors in each of the two rows are different in the sub-scanning direction, so in order to obtain uniform output signals in the sub-scanning direction, it is necessary to A line memory is required in the latter stage. Moreover, 7 in the main scanning direction.
In order to obtain a realistic signal, if a CCD sensor connection method is used, the reading device becomes complicated and there is a risk of going against the current technological trend of obtaining a simple reading device and miniaturizing it. .

[Purpose of the invention]

In view of the above-mentioned problems, an object of the present invention is to provide a reading device that prevents the image quality of a read image from deteriorating due to missing pixels.

[Summary of the invention]

In order to achieve the above object, the reading device of the present invention arranges a plurality of line sensors in a straight line and makes the pixel width at the edge of the sensor smaller than the pixel width at the edge of the line sensor. , it is possible to ensure the width that inevitably occurs due to the unevenness of the line sensor cutting section, and to prevent completely missing pixels.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Figures 1 and 2 show an embodiment of the reading device of the present invention, and Figure 3 shows a device using the reading device of the present invention. It is.

In Figure 3, the platen roller (1) moves the manuscript paper (
2) is sent out in the sub-scanning direction on the paper guide (3). The image written on the manuscript paper (2) is illuminated by light emitted from a light emitting section (6) fixed to the support body (5). The image on the irradiated original (2) is formed on a line sensor consisting of a COD of a reading device (9) via a rod lens array (7) fixed to a support body (5). This reading device (9) is fixed by a support body (91K back cover (8)). The image formed on the line sensor is converted into an electrical signal and output from the output terminal 00.

Next, an embodiment of the reading device of the present invention will be described with reference to FIGS. 1 and 2. In the reading device a, a line sensor (II) made of COD is arranged at one end of an alumina substrate 0.Thick film multilayer wiring (not shown) is formed on one main surface of this alumina substrate α. An anti-reflection black insulating layer (not shown) covers the entire surface.A lead terminal (2D) connected to an external power source (not shown) is arranged at the other end of the alumina substrate (11). On the other hand, line sensor 0
The marks are pixels (1101) at both ends of lie/sensor 081
is the +large area of the pixel 0υ in the part that is not at both ends).

The signal output obtained from this pixel 0η is sent to the transfer stage Oa through the gate (131).Since the pixels (1101) at both ends have a pixel width of 10, the signal output proportional to the pixel area is also sent to other pixels. Therefore, the number of pixels (11
01) and gate 03, an amplifier (1
The level of the signal output is made uniform through the intervening gate B, and the signal is sent to the transfer stage a through the gate gate. The output signal of the line sensor from this transfer stage (14) is transferred to the bonding pad (151).
A bonding pad Q6 electrically connected to the thick film multilayer wiring via a bonding wire (17) connected to 1C.
) vc large input. The signal input from the bonding bat AE is output from the output terminal (2]) via a thick film multilayer wiring (not shown). Note that (a) shows the unevenness of the line sensor cutting part of the line sensor section, and the point fIJ@ shows the original pixel size of the pixel (uol).

In order to adopt the above-mentioned configuration, the reading device shown in FIGS. 1 and 2 has a plurality of line sensors 0υ arranged in a straight line, and the unevenness ( It is possible to ensure that there are no completely missing pixels while ensuring the width that inevitably arises by using two.Also, a simple reading device can be obtained with the above configuration, and in addition, it is possible to make the reading device large-sized. Rather, the width of the bulky part of the line/sensor can be narrowed compared to a structure in which line sensors are arranged in a staggered manner, making it easier to downsize. Device (1 (
1 is not limited to this, for example, a plurality of line sensors (II
directly connected to the alumina substrate (1
There is no need to use 1.

Next, another embodiment of the present invention will be described with reference to FIG.

FIG. 4 shows another example of the pixel configuration in which the pixel width is increased without changing the pixel area at the end of the line sensor.

In FIG. 4, the pixels at both ends of the line sensor (1101
) has a positive pixel width compared to pixel 01) outside the both sides of the line sensor, doubles the width in the sub-scanning direction, and makes the pixel area spaced from other pixels. By doing this, in order to make the signal output levels the same, there is an effect that there is no need to install an amplifier (as in the reading apparatus shown in FIGS. 1 and 2).

It goes without saying that the pixel (1101) can have any shape as long as it has substantially the same area as the pixel (in this case, pixel-like).

Note that in one embodiment and other embodiments of the reading device of the present invention,
It goes without saying that the effect is remarkable in an image sensor (commonly known as a contact sensor) that reads at the same magnification.

〔Effect of the invention〕

The reading device of the present invention has a plurality of line sensors arranged in a straight line, and reads pixels at both ends of the line/sensor in order to prevent pixel omission at the joint between the plurality of lines/sensors. This is a reading device whose width is substantially smaller than other pixels. Therefore, by preventing pixel dropout occurring at the connection portion of the line sensor, it is possible to prevent the image quality of the read image from deteriorating.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the reading device of the present invention - g3 cutaway perspective schematic diagram; Fig. 2 is a simplified block diagram of the line sensor shown in Fig. 1; Fig. 3 shows the reading shown in Fig. 1; FIG. 4 is a schematic cross-sectional view showing a device in which a reading device is mounted, and FIG. 4 is a simplified block diagram showing another embodiment of the reading device of the present invention. CI+), (11,ol,)...pixel (181...
Line Sensor Representative Patent Attorney Kensuke Chika (and 1 other person) 1st
Figure 2 Figure 4

Claims (1)

[Claims] In a reading device configured by arranging a plurality of line sensors in a straight line, the reading width of pixels at both ends of the plurality of line sensors in the main scanning direction is narrower than pixels other than the pixels at both ends. Characteristic reading device.