JPS59105762A - Original reader - Google Patents

Abstract

PURPOSE:To simplify the structure and adjustment of a lens system by reading the original image of each region obtained by dividing a line by the 1st and 2nd photoelectric transducer groups with time shifts and then synthesizing those original images with time control. CONSTITUTION:A photoelectric transducer group 14 reads the divided region of one side on the 1st line of an original 11; while the 2nd photoelectric transducer group 15 reads the image of the divided region of the other side on the 2nd line apart from the 1st line by (n) lines. The output image signal of a CCD chip 16 constituting the groups 14 and 15 is quantized by a quantizing circuit 17. The quantized signal given from a CCD chip constituting the group 14 is successively recorded to a memory 18 for each line and then read out after lapse of the time during which the secondary scan is carried out by an amount equivalent to (n) lines. The picture signal which received a delay control is synthesized with the picture signal obtained from the group 15 via the memory 18. Then those signals are collected on a line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a document reading device used in a facsimile machine or the like.

[Technical background of the invention and its problems]

Conventionally, many IQ document reading devices such as facsimile machines have been developed that use a CCD linear image sensor and a spherical lens system. However, recently, in order to make the equipment even more compact and maintenance-free,
Efforts are being made to develop contact linear image sensors.

This contact type uses a rod lens array as a lens system to form an image of the same size as the original, and is provided with an array type photoelectric conversion element of the same size as the original. In this way, the imaging distance can be shortened to about 15 mm, and it is expected that the JGI can be significantly downsized.

However, as this type of sensor, a CdSe -? Although devices equipped with a photoconductive thin film such as CdS have been developed, there have been problems with initial characteristics such as responsiveness. In contrast, high-speed contact type linear
As an image sensor, there is a charge storage type solid state device such as a CCD. However, this type of solid-state device is small, and the maximum width of the senna portion is about 30 m. For this reason, when reading an image of the same size as the original, it was necessary to use a plurality of solid-state elements.

Figures 1 and 2 show examples of this.
In order to read the image of the line, a plurality of CCD 2 a,
2b to 2n are arranged in two rows in a staggered manner, and the image of one line is alternately divided and read.

This is each CCD2a...? Compared to the chip lengths of CCDs b to 2n, the imaging surface length t is short, so each CCD 2h, 2b
This was done in consideration of the fact that if .about.2n were arranged in a line, there would be portions that could not be imaged. However, 1
The image of each area divided by the line is divided into two columns of CCI) 2
a.

5 rod lenses 3 to form images on 2b to 2n, respectively
a, 3b to Enf'i are provided with a predetermined inclination and their conjugate lengths are adjusted, for example, as shown in FIG.

However, with such a structure, lot 6 lens 3
It is very difficult to adjust the positions of a, 3b to 3n, and it is extremely difficult to set the images from the two optical systems so that they are in a straight line on the document surface.

This also caused maintenance problems.

[Purpose of the invention]

The present invention has been made in consideration of these circumstances, and its purpose is to simplify the lens system and its adjustment, and to make it possible to read and capture the document image of each line well. An object of the present invention is to provide a document reading device having an easy and highly practical configuration.

[Summary of the invention]

In the present invention, first and twentieth photoelectric conversion element groups are provided along two lines in the main scanning direction of the original, and the image of each area formed by dividing the main scanning direction of the original is read by using the light of each line.
After the output image signal from the first photoelectric conversion element group on the upstream side in the sub-scanning direction is delayed by the time required for sub-scanning between the two lines, this image signal is applied to the first photoelectric conversion element group. The output image signals from the two photoelectric conversion element groups are combined to obtain one line of image signals.

[Effect of horns]

Therefore, according to the present invention, the original image of each area formed by dividing one line is read by the first and second photoelectric conversion element groups with a time lag, and then is synthesized under time control. Here, it becomes possible to obtain one line of image signal satisfactorily. 7) Since each photoelectric conversion element group needs to read each of the two lines of the original image separately, it is possible to easily configure a condensing optical system.Also, the adjustment of the optical system is also simple. Therefore, it can be compactly incorporated into a facsimile machine or the like, and its maintenance can be facilitated, resulting in great practical effects.

[Embodiments of the invention]

Hereinafter, each embodiment of the present invention will be explained with reference to the drawings.

FIG. 3 is a schematic diagram of the groove R1 of the embodiment device. In the figure, reference numeral 11 denotes a document, which is conveyed in the direction of the arrow (sub-scanning direction). First and second photoelectric conversion element groups 14.15 are arranged opposite to the transported document 1 via rod lenses 12.13.

These photoelectric conversion element groups 14 and 15 are constructed by linearly arranging a plurality of CCD chips 16 a and 16 b to 16 H alternately along two lines in the main scanning direction of the original 11. be. , and these photoelectric conversion element groups 14 and 15 alternately read each original image in the area divided in the main scanning direction of the original 1. That is, the first and second photoelectric conversion element groups 14.
15 is provided to face two lines on the original 11 separated by n lines, and 12 and 15 are provided by rod lenses 12 and 13.
The erect image of the original A'rJ 11 formed on J1 is inputted. And CCD Chisozo I
6a, 16b to 16n are arranged in a so-called staggered manner so that their imaging areas are divided in the main scanning direction and are opposed to each area of the original 1, and the first and second photoelectric sensors A conversion element group 14, l5f is formed.

As a result, the first photoelectric conversion element group 14 reads the image of one of the divided areas on the first line of the original 1, and the 20th photoelectric conversion element group 15 reads the image of one of the divided areas on the first line of the original 1. The image of the other divided area on the second line, which is n lines away from the second line, is read. Thus, the CCD chips 16h and 16b constituting each photoelectric conversion element group 14.15.
The output image signals of ~16n are sent to the quantization circuit 17a.

17b-17nf, respectively.

A CCD that turns on the first photoelectric conversion element group 14
The quantized image signals from the chip are sequentially recorded line by line in the memories 18a, 18b to 18k, and then
After the time required to sub-scan the document 11 for n lives, the document 11 is sent out first. This memory 18a, 18b-
18k', both signals delayed and controlled via 1 and the second light'
The image signals obtained from the faL conversion element group 15 are combined by a synthesis circuit (not shown) and combined into one line of image signals.

According to the device configured in this way, both signals in the area not included in the image signal read by the second photoelectric conversion element group 15 from the line εl'42 are already in the first line on the first line. The image signal of this area is read by the photoelectric conversion element group 14 of 1, and the image signal of this area is stored in the memory 113g.
Since the delay is controlled by b to 1/lk and is synchronized with the timing of reading the image signal from the second line, the image signal of one line can be effectively and easily synthesized here.

Moreover, since we adopted a method of dividing the area in this way and reading the image of each divided area by dividing it into two lines, the tl configuration of the rod lens 12. The optical path may be set perpendicular to the original 11 as shown in the figure. In the case shown in FIG. 4, one rod lens allows
Images of different lines can be focused at corresponding positions. Therefore, the configuration of the optical system can be significantly simplified. Moreover, since the adjustment is simple, just match the conjugate length, the maintenance is only frr1, and the adjustment accuracy can be made sufficiently high. That is, by adjusting the distance between the original 11 and the CCD chip 16 to the conjugate length λ of the rod lens 12.13,
Simply align the optical system with high precision by simply aligning the i, l! j can be adjusted.

As described above, the present apparatus can simplify the optical system and greatly simplify its adjustment, and can produce great practical effects such as being able to read each line image well.

Note that the present invention is not limited to the above actual JjtJ+ example. For example, the width of the area divided in the main scanning direction is CCD
It may be determined according to the chip, and the number of divisions may also be determined according to the document width.

It is also possible to adjust the timing by using a delay helix instead of the memory, and furthermore, it is also possible to read the image over three or more lines and adjust the timing of image signal synthesis between the lines. . In short, the present invention can be implemented with various modifications without departing from the gist thereof.

[Brief explanation of drawings]

Figure 1 does not show an example of a conventional device.4! ,! t H12i (14) factors, FIG. 2 is a configuration diagram of the optical system of the conventional device shown in FIG. 1, FIG. 3 is a schematic configuration diagram of an embodiment of the device of the present invention, FIG. FIG. 5 is a configuration diagram of the optical system in the embodiment device. 11... QMi, 12, l 3... Rod lens, 4... 10th photoelectric conversion element group, 15... 2nd
photoelectric conversion element group, l 6 a, 16 b ~ 16
n ・= CCD chip, l 7a, 17b~17
n - quantization circuit, 18a, 18b"-1 memory (delay means) at 78;

Claims (3)

[Claims] (1) A document subsystem that separately reads document images in predetermined areas that are arranged along two lines in the document main scanning direction and are alternately allocated to each line of the area in which the document is divided in the main scanning direction. The output image signals of the first photoelectric conversion element group on the upstream side in the scanning direction, the second photoelectric conversion element group on the downstream side in the document sub-scanning direction, and the first photoelectric conversion element group are transferred between the two lines. means for delaying by the time required for sub-scanning;
A document reading device comprising: a synthesis circuit that synthesizes the delayed image signal and the output image signal of the second photoelectric conversion element group to obtain one line of document one image ID. (2) The document reading device according to claim 1, wherein the photoelectric conversion elements constituting the first and second photoelectric conversion element groups are composed of array-type image sensors. (3) The document according to claim 1, wherein the means for delaying the output image signal comprises a storage device that sequentially stores the output image signals and then reads out the stored image signals after a certain period of time. reading device.