TW552796B - Optical scanner capable of automatically positioning image reading device - Google Patents

Abstract

There is provided an optical scanner capable of automatically positioning image reading device, which uses a driving device to simultaneously drive the first and second movement devices to move in a direction parallel to the document at a speed ratio of 2:1, wherein the first movement device has a first reflective mirror formed therein, and the second movement device has the second and third reflective mirrors respectively formed therein. The document is reflected by the three reflective mirrors and emitted in a direction parallel to the guiding path, and focused by the lens to form the document image on an image capturing unit, wherein a sensing mark is arranged at a suitable position of the second/third reflective mirror. When the driving device drives the second movement device to make the sensing mark of the second/third reflective mirror enter the light cone formed between the lens and scanning document, the image capturing unit is able to sense the mark and determine the position of the image reading device.

Description

Oi.rj, 1 Amendment No. 9010534i

552796 V. Description of the invention (1) Field of the invention: The present invention relates to an optical scanner, particularly an optical scanner capable of automatically positioning the position of an image reading device. Background of the Invention: An optical cat scanner is a computer peripheral product that uses the photoelectric conversion principle to convert the scanned object image into digital data. The scanning method mainly uses a light source to set the photo on the file to be hidden, and then uses image capture The unit 疋 (for example, CCD) captures the document image, and finally converts the image signal into a digital signal through the photoelectric conversion principle and outputs it to a computer for processing. Please refer to FIG. 1A, which is a schematic diagram of a conventional optical scanner. It includes a document carrier board made of transparent material. The upper part of the document holder 1 can be used for scanning documents. The image reading device is used to read the image data of the file 11. Please refer to FIG. 1B, the image reading device is composed of a driving device 1 2, a first mobile device 1 3, a second mobile device 丨 4 and an image capturing unit 15, the driving device 丨2 is provided with a guide path 16 and a power source (not shown in the figure). The guide path 6 may be two guide rods parallel to the scanning file 11 1 and the power source is a stepping motor that can drive the image The reading device performs scanning. The above-mentioned first and second mobile devices 1 3, 1 and 4 are respectively provided on the guide path 16 of the driving device 12 and are driven on the guide path 16 by the driving of the stepping motor. Reciprocate in the same direction. The first mobile device 13 is provided with a scanning light source 17 and a first reflector 18, and the second mobile device

552796 --- f90105346 V. Description of the invention (2) 91. 12. The correction in January 2013 is provided with a second reflecting mirror 19 and a third reflecting mirror 20, and the scanning light source 17 can be scanned and set. The image of document 11 is above the carrier plate 10, and the first mirror i 8 can receive the image reflected by document 11 and shoot out in a direction parallel to the scanning document ii (positive X direction); the second movement The second mirror 19 of the device 14 is used to receive the document image emitted by the first mirror 18 and reflect the image to the third mirror 20. When the third mirror 20 receives the document image After that, the image will be emitted again in a direction parallel to the scanned document 11 (negative X direction), and the emitted document image will finally be condensed through the lens 2 1 to the image # 1 taking unit 15 (such as CCD). And read the document image data. The width of the document 11 concealed by the age sweeper is 210mm in terms of A4 and 297mm in terms of A3, but the length of the image capture unit 15 used by the general scanner $ is usually It is between 40 and 60mm, so if you want to make the end of 15 yuan and the image acquisition, you must keep the mobile device from the-and the first position. For a full range reading, the head 2 1 must be above the unit 1 5 so it is set to double the starting position of 1 4 to scan the middle position. 2 The mobile device captures a small mirror 1 8 , 19, 2 C Document images must converge on the optical path AB of the video scanner. The speed must be the second moving device. 13 must be moving from the second mobile device. end

The range of the document image can only pass through the three optical paths A B (see Figure 2). Due to the movement of the first mobile device 13 and the position of the first scanning end point during scanning, the positions of the first scanning end point 1 and 3 can be moved in the same position.

552796 5. Sending ^ a = is the image of the obscure device: before the type of Satoshi, usually the first step is to enter the starting position of Satoshi, color level, lightness, darkness, and squares. The position must be in the image reading and wearing, ° advance correction, etc. Because these corrections move this image reading before Pei Zhizhi enters the scanning start position, because = at the distance, the shadow]:;! It is before the starting position of scanning the cat = scanning through a distance-f: knowing the cat start: the position starts and the document is scanned formally. After the correction, it will reach the scanning start position from the previous cat. It must be set to reach the scan. Please refer to the figure again. The internal pre-reactor 22 is set to 1 and 3 in the image with the eye-catcher. After device 2 3 inserts inductive transmission, move and execute the start position time period description. It can be seen that the shadow gift $ Φ ^ The item acquisition device must be able to perform shadow scanning, and the control scanner Qiu Shi < _ β 成 2 丨Ding ~ Bao rating start point # # ¥ The firmware of σ can sense the position of image reading device, and then can scan the document. No. β, so the scanner of the conventional technology is mainly j * a sensor 22 is installed near the starting point, the sensor transmitting end and a receiving end, and the first mobile device A corresponding film 2 3 is provided at the corresponding position of 2 2. When scanning the document 1 1, it is controlled by the driving device 丨 2 to move the negative X direction until the film of the first mobile device 13 is scanned. In the device 22, and blocking the signal between the transmitting end and the receiving end, the driving device 12 controls the image reading device to scan and correct the movement in the positive X direction, and the formal operation is not performed until the first mobile device 13 reaches the scanning. File scan. However, since the conventional technology uses a sensor to sense the shutter of the first mobile device to determine the position of the image reading device, it will cause the manufacturing cost of the scanner.

91. 13 Rev. 552796 Case No. 90105346 V. Description of the invention (4) Improved. In addition, the use of sensors to judge the image reading device is not only less accurate but also slower. Therefore, how to think of a method that does not require a sensor The position of the image reading device can be directly judged to reduce the manufacturing cost of the scanner and improve the accuracy of the position judgment. This is really the first task for R & D personnel engaged in scanner manufacturing. Object of the invention: The main object of the present invention is to provide an optical scanner capable of automatically positioning an image reading device, which can determine the position of the image reading device without going through a sensor, thereby reducing the manufacturing of the scanner. cost. A secondary object of the present invention is to provide an optical scanner capable of automatically positioning an image reading device, which can more quickly and accurately determine the position of the image reading device to obtain a more efficient optical scanner. The optical scanner with an automatic positioning image reading device of the present invention includes a transparent carrying plate for carrying scanning documents above, and a driving device for driving the image reading device to scan the document image below. The capture device includes a first mobile device, a second mobile device, a lens, and an image capture unit. The first mobile device is set at the scanning start position, and the second mobile device is set at the scanning intermediate position, and the driving device drives the first and second mobile devices at a speed of two to one at the same time in the same direction. Scan the file parallel to the direction of the file. A first mirror is arranged inside the first mobile device, and second and third mirrors are arranged inside the second mobile device. The first mirror can parallel the document image with

Page 7 552796

It is emitted in the direction of I ^, and reflected by the second and third mirrors, and then the second document / document image is emitted in a direction parallel to the scan file. Finally, the document image is imaged in the image capture by the convergence of the dagger and the brother's head. Take the top of the unit to read the file image. The $ file image is emitted from the file and reflected by the three mirrors. The range of the head 1 is called "light cone". However, the scanning speed of the first mobile device and the first mobile device is two to one during scanning. The shape of the cone will maintain the distance and the distance between the first mirror and the lens will remain unchanged, but the positions of the first and third mirrors will change as the second mobile device moves. Therefore, the present invention mainly uses the correspondence between the position of the second reflector (or the third reflector) at the light cone and the position of the guide path of the second mobile device to infer the exact position of the image reading device. In an implementation manner, an induction mark is provided on the surface of the second reflector (or the third reflector). When the induction mark enters the light cone because the driving device drives the image reading device, the image capturing unit can immediately sense the induction. The position of the mark corresponds to the position of the image reading device in the guide path. Therefore, the optical scanner of the present invention capable of automatically positioning the image reading device can immediately determine the position of the image reading device without setting a sensor, which can not only reduce the production cost but also be faster and more accurate. The local method determines the exact position of the image reading device. In order for your reviewers to have a firm understanding of the purpose, features, and effects of the present invention, and to have a better understanding and approval, the following detailed description is given in conjunction with the drawings:

Page 8 552796 Case No. 90105346 0J. I After 3, 5th, and 5th Rev. Description of the invention (6): Brief description of the drawings: Figures A and B are schematic diagrams of conventional optical scanners; Figure 2 Figures 3A and 3B are schematic diagrams of the optical scanner of the image reading device capable of automatically positioning the image; Figure 4 is the image reading of the invention Figure 5 shows the light cone of the device; Figure 5 is the brightness distribution of a linear light source on the scan file; Figure 6A is a schematic diagram of the induction mark on the surface of the second mirror; Figure 6B is the surface of the second mirror Brightness distribution diagram; FIG. 7 is a flowchart of a scanning method of the optical scanner of the present invention. Explanation of drawing numbers of the drawings: 1 0, 1 0 a to the carrier plate 1 2, 1 2 a to the driving device 14, 14 a to the second moving device 16, 6, 16 a to the guide path 18, 18 a to the first reflecting mirror 20, 20a ~ 3rd reflector 2 2 ~ sensor 3 0 ~ sensor mark 1 1 ~ document 13, 13a ~ first mobile device 15, 15a ~ image capture unit 17 ~ scanning light source 19, 19a ~ second Reflector 2 1 and 2 1 a ~ Lens 2 3 ~ Slot Detailed description: The present invention discloses an optical scanning capable of automatically positioning an image reading device

Page 9 552796 ---- Case No. 901Q5tS4fi__year g g_Amendment ___ V. Description of the invention (7) The device mainly uses the position of the reflector in the light cone of the image reading device to determine the image reading The exact location of the device in the scan path will be explained in the following article. Please refer to FIG. 3A and FIG. 3B, which are schematic diagrams of an optical scanner of an automatic positioning image reading device according to the present invention; it is composed of a document carrying plate 10a, a driving device 12a, and an image reading device. composition. The document carrying plate 10a is made of transparent material (such as glass or acrylic), and a scanning document 11 is arranged on the upper side thereof, and an image reading device is arranged on the lower side thereof, and the document 11 is scanned by the driving device 1a aim. The driving device 12 a can provide an image reading device with a guiding path 16 a parallel to the scanning document 11. The guiding path 16 a includes two parallel guiding rods and a stepping motor (not shown in the figure). The stepping motor is used as the power source of the driving device 12a to drive the image reading device to scan the cat. The image reading device includes a first mobile device 13a, a second mobile device 14a, a lens 21a, and an image manipulation unit 15a. The technology is the same 'so it will not be repeated here' and the same component symbol is added with "a" to distinguish it. Among them, the biggest difference between the optical scanner of the present invention and the conventional technology is that the present invention can determine the position of the image reading device without providing a sensor and a shutter, and its implementation is described as follows. Please refer to Figure 4, which shows the schematic diagram of the light cone of the image reading device. First, the term "light cone" is defined. In this article, the light cone refers to the document image. Issued below 11

Case No. 9_0105346

552796 V. Description of the invention (8), the distance to the lens 21a after reflection of the second and second mirrors 18a, 19a, and 203. During the entire image concealment process, the shape of the light cone remains constant regardless of where the image buying device is moved, but the positions of the second and second mirrors 19 a and 20 a in the light cone will follow The movement of the second mobile device 14a is changed. Taking the second mirror i 9a as an example, the position of the second mobile device 14 a in the guide path 16 & and the corresponding position of the second mirror 19 a in the light cone during the scanning process are unique. (Ie one-to-one correspondence). In addition, 'the position of the second mobile device 1 3 a can also be calculated from the position of the second mobile device 1 43'. Therefore, the position determination of the image reading device according to the present invention can pass through the position of the second reflector 9a in the light cone Corresponds after calculation. Please refer to FIG. 5 ′, which is a brightness distribution map of a scan file illuminated by a linear light source. The brightness distribution map is substantially the same after being reflected by a reflector. Please refer to FIG. 6A. The main feature of the present invention is that at least one surface (c) of the second reflecting mirror 19a is provided with an inductive mark 30. The inductive mark 30 must be on the second reflecting mirror. Within the range of the brightness distribution area formed by 9 a, and its color is the most non-photosensitive color (such as black), when the driving device 1 2 a drives the image reading device in the guide path 16 a of the scanner When it will move, the second reflector 19a inside the second mobile device 1 4a will also move back and forth in the light cone. When set at c, the induction mark 30—into the range of the light cone, the image capture unit 1 5 a will immediately produce a significant change in the brightness sensed there (as shown in Figure 6B), and calculate the current position of the second reflector 19a, while further moving the second mobile device 14a and the first The position of the mobile device 1 3 a is calculated.

Page 11

The required scanner scanning second reflection mark 30 is set at any position, and any bit image reading and image capturing unit is set to reach the scanning and scanning device. The scanning device also enters the scanning screen. The positive distance before the starting position is calculated, and the scanning start point is inferred based on the corrected distance. Finally, the corresponding position of the mirror 19 a in the light cone when the image reading device is in this position is inferred. At this time, it can be sensed on the surface of the second reflector 19 a and just to enter the range of the light cone. Regardless of whether the image reading device is placed on the guide path 6a, as long as the scanner is activated, the driving device 1 2 a will drive the shadow set to move in the negative X direction (scanning start point direction), until the image element 1 5 a senses the sensing mark 30, it indicates the starting point of the image reading and concealment, and then you can The image reading device is controlled to turn to conceal the calibration work. After the scanning of the cat is completed, the image reading just reaches the scanning start position, and the scanner can officially start the area to perform document image capture. Yanyue see Figure VII, which is a flowchart of the scanning method of the optical cat scanner of the present invention; its steps include first driving the reading device to move in the negative χ direction until the image extraction unit senses a sensing mark (71); Then drive the reading device to move to the correction position of the scanner in the positive X direction, in which a correction plate (72) in black and white is provided at the positive position of the school; f the recorded pixels and the pixels of the correction position ( pixel) The gap is stored in the memory (73); the reading device is driven into the scan area and the image is captured (74); the reading device is driven back and the scan is found according to the pixel gap in step (73) Starting point (75).

Page 12 552796 Case No. 90105346 91 ι2. 1 Revised in March 3rd, invention description In summary, the second reaction should not be used to guide the circuit breaker, so it is not necessary to use the sensing device to the south. It can also be set at According to the second (10), the position of the position of the optical mirror in the light cone of the optical cone of the present invention is to reduce the inferred position of the second reflector of the scanner in the light cone by a similar conventional technique. Therefore, the judgment can be improved by setting the optical scanning sensor mark to be the same as the third retro-reflective mirror. Therefore, the scanning device is not scanned due to, and then it is inferred that the position of the sensor for image reading is based on the manufacturing cost, speed, and speed of the target. Sweep the cat on the mirror, which will be repeated. Can take out the image acquisition device and the film itself. In addition, the motion will be surely effective. The principle and the design based on the position determination of the transmissive reading device. The present invention is more familiar with image reading and the method of the present invention is and of course. The preferred embodiment of the sight is not intended to limit the scope of implementation of the present invention. Any modification made by those skilled in the art without departing from the spirit of the present invention should fall within the scope of the present invention, and therefore the scope of protection of the present invention It should be based on the scope of patent application described below.

Page 13 552796 Case No. 90105346 01 ΙΟ υλΛ ”Λ_Ά 3 Modified drawing Brief description of the drawing: Figures A and B are schematic diagrams of optical scanners of conventional technology; Figure 2 is the document image Optical path path diagram of the image reading device; Figures 3A and 3B are schematic diagrams of the optical concealer of the image reading device capable of automatically positioning the invention; Figure 4 is the light cone of the image reading device of the invention Schematic diagram; Figure 5 is a brightness distribution diagram of a linear light source irradiating a scan file; Figure 6A is a diagram of setting a sensing mark on the surface of a second mirror; Figure 6B is a brightness distribution diagram of a surface of a second mirror; FIG. 7 is a flowchart of a method for sweeping eyelids of the optical illiterator of the present invention. Explanation of drawing numbers of the drawings _ · 1 0, 1 0 a ~ load plate 1 2, 1 2 a ~ drive device 14, 14a ~ second moving device 16 6, 16a ~ guide path 18, 18a ~ first reflection Mirror 20, 20a ~ Third reflector 2 2 ~ Sensor 3 0 ~ Sensor mark U ~ File 13, 13a ~ First mobile device 15, 15a ~ Image capture unit 17 ~ Scan light source 19, 19a ~ Second Reflector 2 1, 2 1 a ~ Lens 2 3 ~ Shelf

Page 14

Claims (1)

552796 91-^. ^^ 90105346 6. Scope of patent application1. A light and a driving device capable of automatically positioning the image reading device are provided in parallel to the scanner, including: a first mobile device, a Based on this guide?丨 ^ The guiding path of the document; the 'drive' is provided with a -reflection path on the inside and is driven by the driving device and shoots in a direction parallel to the guiding path = the document image can be reflected by a second mobile device, which is set in the Guidance 'is driven in the same direction and lower than the first mobile device ~ 7 diameters and driven by the second and third catty shovel that can reflect the flute at a half rate. The document image transmitted by the reflector is set inside, and the The document image can be achieved in the same direction as the flat material; 5T is projected in the direction of the guide path; and an image capture unit is used to converge the image in the image capture unit = the third Reflected by a mirror; < for document image capture in which the image reading device is "light cone" in the lens and scan sampling range, a cone formed between the Tian document and a mirror surface is provided ~ f The inside of the second mobile device enters the miscellaneous induction mark at least for the movement of the driving device. When the induction mark is located by the induction of the induction mark. At this time, the image capture unit can output bit 2 of the image reading device. · The optical cat scanner as described in the first item of the patent application scope, in which the image eight automatic positioning scene: image reading device / peck The fetching device is disposed below a transparent document bearing plate, and is arranged above the document bearing plate for scanning documents. 3. The automatic positionable image reading device as described in item 1 of the scope of patent application ai Page 15 552796 Case No. 90105346 91 12. Revision in March 3rd 6. Patent application scope of the optical scanner, in which the guiding device provided by the driving device is two guide rods parallel to the scanning document. 4. The optical scanner capable of automatically positioning the image reading device as described in item 1 of the scope of the patent application, wherein the driving device uses a stepping motor as a power source for the scanning eyes. 5. The optical scanner capable of automatically positioning the image reading device according to item 1 of the scope of the patent application, wherein the first mobile device further includes a linear light source as a light source when scanning a document. 6. The optical scanner capable of automatically positioning the image reading device according to item 1 of the scope of the patent application, wherein the sensing mark is provided on the second reflecting mirror of the second mobile device. 7. The optical scanner capable of automatically positioning the image reading device as described in item 1 of the scope of the patent application, wherein the sensing mark is provided on the third reflector of the second mobile device. 8. The optical scanner capable of automatically positioning the image reading device as described in item 1 of the scope of the patent application, wherein the image capturing unit is a charge coupled device (CCD). 9. The optical scanner capable of automatically positioning the image reading device as described in item 1 of the scope of patent application, wherein the sensing mark is preferably a non-photosensitive color. 1 0. A scanning method for an optical scanner, the steps include: a. First driving the reading device toward the scanning start point until the image capturing unit senses a sensing mark; b. Driving the reading device to scan Move the sighting direction to the calibration position of the scanner; c. Record the gap between the sensor mark and the calibration position (pi xe 1) and store it in Page 16 552796 9112.13 Page 17