TWI253842B - Image sensor unit and image reader - Google Patents

Abstract

The present invention provides a small-sized image reader which includes two image sensor units arranged opposite to each other across a document form to make an image read faster and reads both surfaces in a single document-feed time. A light shielding member is arranged at some position halfway between a light source for document irradiation provided to one image sensor unit and a SELFOC (self-focusing) lens array of the image sensor unit on the opposite side, so as to eliminate the direct incidence light which is transmitted through the document form to impinge on the SELFOC lens array of the opposite side. Consequently, the information on the reverse surface of document is not mixed and halation caused by the transmitted light is prevented to excellently read an image.

Description

1253842 (1) VENTION DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an image reading apparatus used in a scanner, a facsimile machine, or a photocopier, and more particularly to an image sensor using a close-contact type image sensor An image reading device and an image reading device for double-sided use. [Prior Art]

In recent years, with the high-performance of personal computers, not only the office but also the general family has increased the demand for quick reading of original paper, and the scanner or printer forms a combined multi-functional machine to process the read originals in the computer. The demand for computer peripherals with output for the function of the instrument temple is expanding.

Related to such an original reading device, an intimate image sensor having a built-in C 感 0 S sensor or an image sensor using a C C D sensor is known. In the case of the scanner system, there is a flatbed scanner system that fixes the original paper and moves the image sensor, or a paper-feeding scanner system that fixes the image sensor and moves the original paper, which is already commercialized. . As far as any of the above scanner systems is concerned, the appearance of the device is required to be small and thin, and the data reading speed is required to be increased. And some of them are known to have a device for reading the double-sided function of the original paper at one time. For this reason, for example, a scanner system for double-sided reading is known in which a document sheet is sandwiched and two image sensors are disposed at a relative position, and the original paper is read by one original paper. The double-sided reading device is mostly a paper-feeding scanner, and generally, for example, sandwiches the original paper and arranges the image sensor so as to face the double-sided position of the original. Xi -4-

1253842 ρτχττ~~—I Year of the month, 3⁄4) is replacing the page 丨 The outline of the double-sided reading device is shown in Figure 2. Here, the arrangement of the small image sensor in the sub-scanning direction is illustrated. This configuration is general - the conventional double-sided reading device shown in FIG. 2 is attached to the document pressing roller 8 and image sensing. The original paper is placed between the cover glasses 5 of the device. This is a method in which two sets of systems are arranged in the vertical direction, and the original paper is fed into the drum 7 on both sides to transport the original paper in the fixed direction.

This double-sided reading device is because the two systems are separated in the horizontal direction S Jt of the reading device, so that the device is enlarged, and since the original feeding is separated by the distance between the stomachs, it is impossible to read the small-sized original. A device that improves such a problem, such as paper, has a unit in which the mutual lens and the optical axis of the image sensor that are disposed opposite each other are largely shifted from the center toward the sub-scanning direction, and are disposed at positions directly above each other. It is not necessary to use the paper on the front side of the reading line to reduce the degree of miniaturization of the drum. (See, for example, Patent Document 1). [Patent Document 1] Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. 1 1 - 2 847 9 8 (Attachment of the Invention) The double-sided reading device disclosed in Patent Document 1 is directed to the light source for the original illumination. The sensibility is wider, and even the illumination light arrives at a place other than the original illumination position, so that part of the light will directly or penetrate the original paper and enter the opposite side of the reading device light receiving portion' resulting in reading the image. -5- (3) - 1253842 The shortcomings of the light and shadow effect appear in the information. On the other hand, in order to prevent the influence of the direct light and the light leakage of the above-mentioned object side light source, there is a side scan of the h position by mutual sensing. Since the direction is greatly shifted and improved, it is difficult to miniaturize even the paper feeding device, and as the above, since the pitch of the original feeding roller is also long, the problem that the small original cannot be processed still exists. (Means for Solving the Problem) The double-sided reading device of the present invention relates to a double-sided reading device that simultaneously reads information written on the back surface of an original paper sheet, and has at least a light source, a cover glass, and a self-focusing lens. The first and second image sensors formed by the array (Selfoc lens arrays) and the light-receiving elements are disposed to face each other with the original document as a center, and from the first image sensor light source to the first 2 A light shielding member that blocks direct light is disposed between the light receiving portions of the self-focusing lens array of the image sensor. Furthermore, the light shielding member may be black or white. In particular, in the case of white, it is preferable to measure the intensity of the reflected light from the reflecting member in the absence of the original. (Effects of the Invention) According to the present invention, the amount of shift of the opposing lens in the sub-scanning direction is reduced, and the interval between the feeding of the document and the interval of the rollers is narrowed, whereby the overall device can be miniaturized. Moreover, small originals can also be read. Moreover, the influence of the illumination light from the opposite reading device can be avoided, thereby preventing the situation in which the back image information is reflected by the original paper-6-(4) 1253842' and the light penetrating through the original paper can be prevented. A light leak occurs, resulting in a white spot. As a result, there is an effect of obtaining a beautiful read image. [Embodiment] An embodiment of the present invention will be described with reference to the following drawings. Fig. 1 is a cross-sectional view showing the mechanism of the double-sided reading device of the present invention.

[Example 1]

Fig. 1 is a cross-sectional view showing the mechanism of the double-sided reading device of the present invention. The image sensors of the two systems are arranged opposite each other, and the original feeding roller is configured on both sides. 1 is illumination light that is directly incident from the light source 3 including the light guide unit (reflected on the original surface and directed toward the optical axis of the lens). The illumination light is partially reflected by the original paper placed on the cover glass 5, and reaches the light receiving element 2 through the self-focusing lens array 4 integrated with the housing 6. The photoelectric element is subjected to photoelectric conversion and converted into electrical image information. 9 is a light-shielding member for absorbing or reflecting light diffused from a light source of the present invention to a place other than the illumination optical axis. The light from the light source 3 is shielded by the light shielding member 9 to form a structure that does not enter the opposite-focusing self-focusing lens array 4. The size of the light shielding member 9 preferably has a size capable of blocking light in the light collecting range of the opposite side self-focusing lens array 4 for the purpose of blocking direct light toward the opposite side self-focusing lens array 4. Hereinafter, a method of manufacturing the sensor will be described. On the unit side of the cover glass 5 of size 1 5 x 3 40 mm and thickness 3 mm -7-

1253842 (5) A plastic plate with a thickness of 5 x 3 3 0 mm and a thickness of 0.5 mm is sandwiched between the surface and the light source 3 supported by the frame 6. [Industrial Plastics Co., Ltd.: Model Sangrod Pai CH 1 700 (transliteration)] The light shielding member 9 formed through the plate. The light guide 3 of the light guide body is provided with a self-made light guide of the company which has three-color light-emitting LEDs such as red, blue and green manufactured by Nichia Chemical Industry Co., Ltd.

The light-shielding member is formed to conform to the frame 6 by forming an anastomotic shape through, and forms a shape that does not affect the light-shielding property due to the offset in the sub-scanning direction. The size of the light-shielding member is such that it does not directly enter the direct-side self-focusing lens array (manufactured by Mitsubishi Rayon Co., Ltd.: model RA-88), and has a sufficient size in the sub-scanning direction. In this case, the diameter of the opposite side lens is 〇. 6 mm, and the light receiving area including the opening angle is completely covered, and the width is set to 5 mm.

In addition, the view is shown in Figure 3. The light blocking member 9 at this time will have the ability to completely block the illumination light. The light-receiving element 2 is a C Μ Ο S-type image sensor (manufactured by Canon Co., Ltd.: Model 6V6), and a plurality of sensor wafers cut into a line shape are adhered to the printed wiring board. In the frame 6, the positioning is fixed at a portion where the focus position of the self-focusing lens array 4 is formed. The image sensor consisting of these parts is arranged in a direction in which the cover glass surface is spaced 0.6 mm apart, thereby constituting the image reading apparatus shown in Fig. 1. The position of the original paper is adjusted to the position of the original feeding roller "by forming a state of the focus position of the self-focusing lens array relative to the image sensor" so that each -8-1253842 ^ I.c;~\: (6) ~ ....—一...... An image sensor and the back of the original paper sheet are to be photocopied (scanned). The output image in this state is the image light that passes through the original paper and penetrates through the original paper. The light is completely blocked, and the image is double-sided. As described above, the light-shielding rate of the light-shielding member is preferably such that the intensity of the illumination light transmitted through the original paper is sufficient in the sensitivity of the sensor wafer. [Example 2] The light-shielding member 9 was coated with a white pigment paint containing the titanium oxide powder in the light-shielding structure of Example 1, and the same as in Example 1, and a double-sided reading device was constructed. The effect of blocking direct light to the image sensor is exactly the same as above: It is applied by screen printing to a thickness of 20 // m using a white pigment coating (manufactured by Titanium Industries, Ltd.). In this state, it is seen that the color of the underlying substrate is in the film thickness of the concealed force, and it is known that the effect of blocking the direct light from the light source is also sufficient. Further, the surface of the light-shielding member 9 is white, and in the state of the paper, the light-receiving members are illuminated by the light-receiving members 2 with respect to the light-shielding members. According to this, for the two sets of sensors, the output signal strength of the white state is measured, and the intensity can be utilized for the strength correction of the output signal. In Fig. 1, the color of the light shielding member 9 may be a ochre color. Any of the configurations constituting direct light that does not enter the opposite side image mirror may be any. According to the thin and thick depth. Sensor lighting will get the better the drift, wear the following, practical

Item 9, in addition to the quality, its light source is applied to the opposite sinus. Under model KA-10, it is not at all. Constructed here

The surface of the original is not placed, and the images of the system are white reference. It can also be a component of the white sensor that has a effect of -9 - (7) \ 1253842, preferably metal. In this case, A metal thin film can be formed on the cover glass substrate by sputtering. Further, it is preferable that the material and the material are those which do not change the distance between the self-focusing lens array and the cover glass in accordance with the pressing at the time of use, and it is preferable to be mechanically stable. (Comparative example)

From the configuration shown in Embodiment 1, a double-sided reading device constructed without the light-shielding member 9 was fabricated. When using ordinary office paper for double-sided reading, direct light from the opposite side of the image sensor will penetrate the original paper and enter the self-focusing lens array. Therefore, the text information on the surface is partially erased, reflected on the back text information, and the entire image is blank (this is called "white point"), and the image quality is extremely poor.

[Industrial Applicability] The present invention is applied to a double-sided simultaneous image reading device of a document type for use in a reading device to be miniaturized, and is an effective technique for a facsimile machine, a scanner, or the like. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing the mechanism of the double-sided simultaneous image reading apparatus of the present invention. The position of the light shielding member may be on the glass or on the back side or may be integrally formed. -10- (8) 1253842 Fig. 2 is a cross-sectional view showing a mechanism of a conventional double-sided counter-reading type reading apparatus. Fig. 3 is a view showing a state in which the light shielding member is assembled in the casing. [Main component symbol description] 1 : Illumination light 2 : Light-receiving element

4 : Self-focusing lens array 5 : Cover glass 6 : Frame 7 : Original feeding roller 8 : Original pressing roller 9 : Light blocking member

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Claims (1)

(1) 1253842 X. Patent Application No. 1 · A double-sided reading device characterized in that a double-sided reading device for simultaneously reading information written by a back surface of an original paper sheet has at least a light source and a neodymium glass The first and second image sensors are configured by the self-focusing lens array and the light-receiving element, and are arranged to face each other with the original paper, and from the first image sensor light source to the second Image sensor A light shielding member for blocking direct light is disposed at one of the portions between the light receiving portions of the focus lens array. [2] The double-sided reading device of claim 1, wherein the light shielding member is a enamel material. 3. The double-sided reading device of claim 1, wherein the light shielding member is a white material. 4. The double-sided reading device according to claim 3, wherein the white material light-shielding member having the image sensor disposed opposite to each other is sensed from another image without the original being placed The light source of the device illuminates the light, and the intensity of the reflected light is measured by the light-receiving element, and the image information intensity from the original paper is performed as the information intensity of the common blank state image from the first and second image sensors. Corrected means of correction. -12- 1253842 七明图说} Single 1 Jane veu (# 符第U: Table is the generation of the map element on behalf of the map refers to the table: the case map, this table,, generation \) y one or two fc day 1 : illumination light 2 : light-receiving element 3 : light source 4 : self-focusing lens array 歹 ] ] 5 : cover glass 6 : frame 7 : original feed roller 8 · _ original press roller 9 : light-shielding member VIII, if there is a chemical formula in this case , please reveal the chemical formula that best shows the characteristics of the invention: