JPS5830274A - Running optical device for image sensor - Google Patents

Abstract

PURPOSE:To eliminate the necessity of movement of originals, by using a movable running mirror in a fixed direction along which a luminous flux reflected from the same place on an original statically placed on a plane is supplied to the lens after the flux is divided into, at least, two parts. CONSTITUTION:A luminous flux produced from a point P at the running starting end of an original glass 1, is supplied to a lens 9 after it is divided into two parts and reaches image sensors 10 and 11. That is to say, the luminous flux which advances along the optical axis ray reaches the image sensors 10 and 11 after it is reflected by running mirors 4, 6, and 7, and the flux which does not contain the optical axis ray reaches the image sensors 10 and 11 after it is reflected by running mirrors 4 and 8. As the running mirror 4 runs in the direction shown by an arrow 5, the three running mirrors 6-8 also run in the same direction at a speed which is a half of that of the running mirror 4, and the auxiliary scanning on an original 2 is performed while the point P moves on the original surface. The main scanning on the original 2 in the direction of width is peformed by the self-scanning of the image sensors 10 and 11. Signals of one line of the original 2 are fetched by combining each outputted signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a traveling optical device for an image sensor, and particularly to an image sensor traveling optical device that divides and connects one line of a document placed still on image sensors alternately arranged in at least two rows on the same plane. The present invention relates to an optical device for imaging.

In facsimile machines and the like, image information of a document is read by a solid-state scanning reading element such as a COD called an image sensor, converted into an electrical signal, and transmitted. Image sensors are constructed by linearly arranging photoelectric elements, but due to technical limitations there is a limit to the number of elements that can be arranged, and it is difficult to manufacture long ones. For this reason, short image sensors are usually connected and used, but since the light-receiving part of the image sensor is smaller than its outer shell, the light-receiving parts are not continuous, resulting in missing parts in scanning.

In order to eliminate such problems, in general, image sensors are arranged alternately in two rows so that the light-receiving areas are continuous throughout, and one line of the document is divided into two, and the image sensors in each row are I am trying to form an image on it. As an example of a device with such a configuration, Japanese Patent Application Laid-Open No. 5TL-1
There is a device described in Japanese Patent No. 48017. Is this the traditional method of dividing the optical path into two, but is it a half mirror? It has been proposed to eliminate the difference in light intensity caused by the use of two mirrors and one lens? One line of the manuscript? It is divided into two parts and images are formed on image sensors arranged alternately in two rows on the same plane. However, this device has a drawback in that it has only a basic configuration and can only be applied to a moving document reading method. In addition, the device described in Japanese Patent Application Laid-Open No. 51-N5425 has a fiber sheet that is arranged in a line rather than alternately with the image sensors, and has a plurality of desired curved light guide paths between the document surface and the image sensor. Set it up and have both? They are optically coupled to compensate for the missing parts between the image sensors. However, since this device has a light guide path, for example, it is difficult to read original documents. Very difficult to read while stationary.

In general, the moving document scanning method damages the document, cannot take pictures of books, and is not suitable for high speeds.
Recently, there has been a demand for an apparatus that reads a document while it is stationary. The ideal configuration for this type of system is that the original image is reduced and projected onto the image sensor, so the lens and image sensor are kept stationary, and the mirror between the original and lens is fixed, which improves reading accuracy. preferable.

An object of the present invention is to provide a traveling optical device for an image sensor that can project one line of a document onto a plurality of image sensors arranged alternately, synthesize the images, and extract them as a single line signal. It is about providing.

A further object of the present invention is to provide the above-mentioned optical device, which performs reading by keeping the original, the lens, and the image sensor stationary, and scanning a mirror between the original and the lens.

A further object of the present invention is to provide an optical system that includes a first mirror and an illumination lamp traveling at high speed, and one of the first mirrors.
It is an object of the present invention to provide the above-mentioned small-sized and low-cost optical device that is composed of a second mirror that travels in the same direction at a speed of /2 and a shared lens.

A further object of the invention is to provide such an apparatus which can easily perform repeated readings.

Other objects and features of the invention will become apparent from the following description with reference to the drawings.

In FIG. 1, an original 2 placed on an original glass 1 is illuminated by an illumination lamp 5. As shown in FIG. The first traveling mirror 4 is inclined by 4 degrees with respect to the document glass +, and is supported by a first traveling body (not shown) integrally with the illumination lamp 5 and moves in the direction of the arrow 5.

The second traveling mirrors 6.7 both have 4 mirrors with respect to the original glass 1.
They are inclined at an angle of 5° and are opposed to each other at an angle of 9d'.

Another splitting second traveling mirror 8 is arranged at an angle of 90° with respect to the original glass 1. These three second traveling mirrors 6, 7, 8 are integrally supported by a second traveling body (not shown) and move in the direction of arrow 5 at half the speed of the first traveling mirror 4. A lens 9 is arranged to face the second traveling mirror 7, and on the opposite side, image sensors 10 and 11 are arranged alternately in two rows on the same plane.

The image sensor to, i + is K as shown in FIG.
, for example, the length A of the outer shell is 57 to 4211111. Width B is 10.4~15.2mm, length C of light receiving part is 26.6~2mm
B, 7 tax (for 2048 bits), width 1
The light-receiving portions are arranged in two rows alternately so that the overlap amount E is at least zero.

A light beam emitted from a point P (a line in the direction perpendicular to the plane of the paper) on the original glass 1 at the travel start end is divided into two parts, enters the lens 9, and reaches the image sensors 10 and 11, respectively. The light beam traveling along the optical axis ray passes through the first traveling mirror 4
．． It is reflected by the second traveling mirror 6.7, passes through the lens 9,
The image sensor 10 is reached. On the other hand, the light beam that does not include the optical axis ray is reflected by the first traveling mirror 4 and the second traveling mirror 8, passes through the lens 92, and passes through the other image sensor 11.
reach. At the same time as the first traveling mirror 4 travels in the direction of arrow 5, the three second mirrors 4 travel in the direction of arrow 5. As the first traveling mirror 4 travels at a speed of 172 in the same direction as the traveling mirror 6.7.8, the point P moves on the document surface and sub-scanning is performed.
Main scanning in the width direction (direction perpendicular to the page) is performed by self-scanning of the image sensors 10 and 11 arranged alternately in two rows, one above the other, and by combining their respective output signals, one line of the original is scanned. A signal corresponding to is extracted.

In FIG. 1, the number of intervening mirrors is different between the optical path leading to the image sensor 10 and the optical path leading to the image sensor 11, resulting in a difference in light amount. However, the optical path leading to the image sensor 10 includes the optical axis light of the lens 9,
Is the optical path to the other image sensor 11 only an oblique ray?
Since the lens 9 and the aperture ratio are higher in the former, the former has a higher light quantity, so even if the number of mirrors is large, it has the effect of correcting the difference in light quantity due to the difference in the number of mirrors. This difference in light amount may be corrected electrically during signal processing, or may be corrected by inserting a VcJ light plate in the optical path with a larger amount of light.

Further, as shown in FIG. 5, a stationary mirror 12 is placed behind the lens 9 in the optical path leading to the image sensor 11. If inserted, the number of mirrors will be the same in both optical paths, and at the same time, there will be enough space in the vertical direction for the two image sensors +0.1+, which has the effect of increasing the size of your own seat for snoring.

In FIG. 1, the width of point P is the width of the light receiving portion of image sensors 10 and 11, which is 15 to 14 μm, multiplied by the magnification (reduction rate) In. For example, assuming rn=6, 6
O, O+5~0.014 = 0.078~0.08
It becomes 4-, which makes it an extremely small clay. This is the first
This means that the width of the traveling mirror 40 can be reduced and the weight can be reduced, and the optical path leading to the first traveling mirror and both image sensors can be shared. It is convenient for moving at high speed. In addition, the second traveling mirror is made up of three mirrors, and although it is larger in width and weight than the first traveling mirror, the speed is only half that.
This is also convenient for high-speed reading.

According to the traveling optical device for an image sensor of the present invention, it is possible to read a document while it is placed on a flat surface, and it is also possible to read a thick book without damaging the document. Further, since the image sensors can be arranged in two rows, upper and lower, and a large number can be arranged alternately in the row direction, high-density reading of, for example, 16 dots)/a+ or higher is possible. Furthermore, the first traveling mirror can be made smaller and lighter, and the second traveling mirror, which is larger and heavier than the first traveling mirror, can also travel at a speed of 172 times that of the first traveling mirror, allowing high-speed traveling and high-speed reading. Since the relationship between the two is always constant, the operation is more reliable and stable than a type of device that moves originals whose size, thickness, curl, etc. are not constant. Furthermore, since the two optical paths are divided by sharing an expensive lens and the first traveling mirror, which is required to be lightweight, space and cost can be reduced at the same time. Also, the scanning of the driving mirror? By repeating the reading, there is an advantage that repeat reading can be easily performed.

The invention is not limited to the illustrated embodiment;
Various modifications can be made by applying known techniques, such as providing a plurality of lenses of the same type.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of the optical device according to the present invention, FIG. 2 is a diagram showing an example of the arrangement of image sensors according to the present invention, and FIG. 3 is a schematic diagram of another example of the optical device according to the present invention. Department only? FIG. DESCRIPTION OF SYMBOLS 1... Original glass, 2... Original, 5... Illumination lamp, 4... First running mirror, 6, 7. 8... Second running mirror, 9... Lens, 10. 11... Image sensor.

Claims (1)

[Scope of Claims] 1. A first traveling mirror that is movable in a fixed direction for splitting a reflected light beam from the same spot on a document placed on a flat surface into at least two parts and making it incident on a lens; 1
a second traveling mirror that is movable in the same direction at a speed of /2, and images the divided reflected light beams on image sensors alternately arranged in at least two rows on the same plane. A traveling optical device for image sensors characterized by: 2. The optical device according to claim 1, wherein there is only one first traveling mirror and one lens, regardless of the number of divisions of the reflected light beam. 5. The optical device according to claims 1 and 2, wherein the second traveling mirror includes a plurality of mirrors arranged for each optical path in accordance with the number of divisions of the reflected light beam.