CN1086261C - Driving method of built-in image scanning device - Google Patents

Abstract

A method for driving image scanner built in computer host includes utilizing detection element of scanner to detect whether file carrying device is in said scanner or not, driving image sensing element to be right above reference pattern if file carrying device is detected to be in scanner by detection element, then starting image sensing element to detect whether file is in file carrying device or not, covering reference pattern by file if file is in file carrying device, so image sensing element can not detect reference pattern and image sensing element is driven to scan file in file carrying device.

Description

Driving method of built-in image scanning device

The invention relates to a scanning device, in particular to a driving method for an image scanning device built in a computer host.

Traditional scanning devices can be roughly divided into palm-type and flat-bed scanning devices. Generally speaking, when using a traditional flat-bed scanning device, the document is first placed on a transparent flat plate such as glass, and the document image is reflected and focused by the optical system. And through the digital circuit, the signal correction adjustment is stored and displayed. A general scanning device includes a light source, a mirror, a lens group, a charge-coupled sensing device (CCD), a pre-processing device (DC gain), a digital-to-analog converter, and a post-processing device. The text or graphic image irradiated by the light source is converted into an electrical signal by an image sensing element such as a charge-coupled sensing device (CCD) through mirror reflection and focusing through a lens. Usually, an image sensing element passes the image before it passes through the scanned object. For data reading, the image sensing element is a linear array formed by a large number of semiconductor elements to sense image data. The above-mentioned electrical signal is then input to a digital-to-analog converter to generate a digital signal after the pre-processing device adjusts its DC gain, and the digital output of the analog-to-digital converter is fed to the post-processing device for contrast adjustment, and then fed to the image display or Do video output. Currently, the scanning device tends to be built into the host computer, so the driving method of the built-in scanning device becomes more and more important.

The object of the present invention is to provide a scanning device driving method built in a computer host, which can automatically start the scanning device.

The object of the present invention is achieved by providing a method for driving an image scanning device, the image scanning device has a document carrying device for carrying scanned documents, and the first sensing element is arranged in the image scanning device to Detecting the document carrying device, the second sensing element is arranged in the image scanning device for scanning the document, and the reference pattern is formed in the document carrying device as identification for driving the second sensing element, The document carrying device may be fed into the image scanning device, and the method at least includes: firstly, the detecting element of the scanning device detects whether the document carrying device is located in the scanning device, and if the detecting element detects that the document carrying device has Located in the scanning device, the above-mentioned image sensing element is driven to a preset position, which is located directly above the reference pattern, and then the image sensing element starts to detect whether the document is located in the document carrying device, and if so, the image sensing element can accept The reflection signal of the reference pattern indicates that the document is not in the document carrier, and the scanning device will not scan. If the document is placed in the document carrier, the reference pattern will be covered by the document, so the image sensor cannot detect it. Referring to the pattern, the image sensing element will be driven to scan the document on the document carrier.

The method of the present invention has the advantages that it can automatically drive and start the scanning device, and it is convenient to use and has good practicability, and its structure file will not jam paper. In addition, the method of the present invention can be applied not only to a scanning device built in a computer host, but also to a common platform scanning device.

Embodiments of the present invention are described below in conjunction with the accompanying drawings, wherein:

FIG. 1 is a schematic diagram of a cassette type scanning device of the present invention;

Fig. 2 is a schematic diagram of the document carrying device of the present invention;

Fig. 3 is a schematic diagram of a document carrying device, a detection element, and an image sensing element of the present invention;

Fig. 4 is a flowchart of the present invention;

5 is a circuit diagram of the light sensing element and the D-type flip-flop of the present invention;

FIG. 6 is a schematic diagram of a reference pattern of the present invention.

The image scanning device of the present invention can be built into a computer mainframe, and has a scanning device base for carrying various components of the image scanning device and providing space for accommodating components and circuits. The file carrying device can be a cassette-type file cassette Or any suitable file carrying device, the file carrying device includes a file carrying device upper cover and a document carrying device lower cover, a reference pattern is set on the document carrying device upper cover or the document carrying device lower cover, and the reference pattern is used for scanning The device detects whether the file is already located in the file carrying device.

Open the document carrying device, then place the object to be scanned in the document carrying device, close the document carrying device and insert it into the scanning device, then a detection element is set in the scanning device to detect whether the document carrying device is fed into the scanning device, a The image sensing element is arranged in the scanning device to detect whether the document is located in the document carrying device. In addition, the image sensing element is used to sense and capture the image data of the document. In the method of the present invention, the detection element of the scanning device first detects the document Whether the carrying device is located in the scanning device, if the detection element detects that the document carrying device is already located in the scanning device, the above-mentioned image sensing element is driven to a preset position, which is directly above the reference pattern, and then the image The sensing element starts to detect whether the document is in the document carrying device. If the image sensing element can receive the reflection signal of the reference pattern, it means that the document is not in the document carrying device, and the scanning device will not scan. If the document is placed in In the document carrying device, the reference pattern will be covered by the document, so the image sensing element cannot detect the reference pattern, and the image sensing element will be driven to scan the document located in the document carrying device. In the preferred embodiment of the present invention In an embodiment, the image sensor is a contact image sensor (CIS), or a charge coupled device (CCD).

The present invention is a driving method that can be built into a computer mainframe image scanning device. For example, the present invention can utilize the original optical disk or floppy drive on the computer mainframe to install the built-in scanning device. The built-in scanning device has a file carrying device , the above-mentioned document carrying device can be extracted from the built-in scanning device and separated to facilitate document insertion.

For example, please refer to FIG. 1 , an image scanning device can be built in a computer host and has a scanning device base 100 for carrying various components of the image scanning device and providing space for accommodating components and circuits. The two sides of the base 100 The wall has a chute 102 for accepting an inserted file carrying device 200 (see FIG. 2 ). The file carrying device 200 can be a cassette-type file cassette or any suitable file carrying device. The driving mode is only described by taking the cassette-type file cassette as an example. A front panel 104 is connected to the base 100. The panel 104 has an insertion slot 106 whose horizontal plane is the same as that of the chute 102. The cassette-type file card The cassette can be inserted from the insertion slot 106 and received by the chute 102 of the base 100. The panel 104 has an ejection button 108, which can be pressed when the document cassette 200 is to be withdrawn from the scanning device. The cassette device 110 is used to respond to the cassette eject button 108 to eject the file cassette.

Referring to Fig. 1, the scanning device has a fixer 112 arranged on the base 100, which is close to the slide rail 102 to fix the inserted document carrier 200, and an image sensing element 114 is arranged in the scanning device, and is driven The device is driven to move the image sensing element 114 and pick up the image to complete scanning. As shown in FIG. 1 , the upper cover 118 of a scanning device is used to cover the base 100 and protect internal components.

Referring to Fig. 2, the file carrying device of the file carrying device 200 includes an upper cover 200a and a lower cover 200b of the file carrying device, the upper cover 200a of the file carrying device is connected to one end of the lower cover 200b of the file carrying device and the other end can be opened by using the connecting end as a shaft, In addition, at least one side of the document carrying device 200 is made of a light-transmissible material to facilitate image capturing by the image sensing element 114 . The above-mentioned light-transmissible material may be acrylic or tempered glass. A reference pattern 208 is set on the upper cover 200a of the document carrying device or the lower cover 200b of the document carrying device. Transparent or otherwise, this reference pattern is used to facilitate the scanning device to detect whether the document 206 is located in the document carrier 200, which will be described below.

Referring to FIG. 3 , when the operator scans the image, the document carrier 200 is opened, and then the scanned object 206 is placed in the document carrier 200, and after the document carrier 200 is closed, it is inserted into the scanning device from the insertion slot 106 of the panel 104 The center is carried by the chute 102. After entering the fixed position, the fixer 112 fixes the document carrier 200. A detection element 210 of the first sensing element is set in the scanning device to detect whether the document carrier 200 has been fed into the scanning device. Among them, one—the image sensing element 114 of the second sensing element is set in the scanning device to detect whether the document 206 is located in the document carrying device 200. In addition, the image sensing element 114 is used to sense and acquire the document 206 image data.

Referring to FIG. 4 , it is a flow chart of the method of the present invention. First, the detection element 210 of the scanning device detects whether the document carrier 200 is located in the scanning device in step 300. If the detection element 210 detects that the document carrier 200 is located in the scanning device In step 302 , the image sensing element 114 is driven to a preset position, which is directly above the reference pattern 208 . In an embodiment of the present invention, a photodetector can be used as the detection element 210 .

5 is a circuit diagram 400 of the present invention for identifying whether the document carrying device 200 is already in the scanning device. This circuit includes a light sensing element 210 and a D flip-flop (Dflip-flop) 404. The light sensing element 210 is connected to a high potential ( V+), in a preferred embodiment of the present invention, the light sensing element 210 is composed of a light emitting diode (light-emitting diode-LED) 210a and a transistor 210b. When the document carrier 200 is fed into the scanning device, the document carrier 200 will be located between the LED 210a and the transistor 210b. If the file carrying device 200 is not in the scanning device, the transistor 210b can receive the light signal sent by the light emitting diode 210a, so the output of the light sensing element 210 is different according to the design, for example, it can be a high potential, and then the light is sensed The output signal of the element 210 is fed to the timing terminal (clock-CK) of the D flip-flop 404, and then the CK terminal responds to the above signal and converts the above signal into a low potential. In addition, the D terminal of the D flip-flop 404 is usually connected to a high potential (V+) , therefore, the Q terminal output will not switch its state, so the image sensor 114 will not be driven. On the contrary, if the file carrying device 200 is located in the scanning device, the transistor 210b cannot receive the light signal sent by the light emitting diode 210a, so the output signal of the light sensing element 210 is a low potential, and then the output signal of the light sensing element 210 Feed to the timing terminal of the D flip-flop 404 , then the CK terminal responds to the above signal and converts the above low potential signal into a high potential, so the output of the Q terminal will switch its state, and the image sensor 114 will be driven.

Referring to FIG. 3 , step 302, the image sensing element 114 is driven to a predetermined position due to the above-mentioned transformation state, that is, it is located directly above the reference pattern 208, and then the image sensing element 114 starts to detect whether the document is already in the document carrying device 200, If the image sensing element can receive the reflection signal of the reference pattern 208, it means that the document is not in the document carrying device 200, and the scanning device will not scan. The reference pattern 208 can be set at any suitable position, for example, when the first reference When the pattern 208 is composed of a transparent object, the reference pattern 208 is disposed on an inner end of the lower cover 200b of the document carrying device. If the document is placed in the document carrying device 200, the reference pattern 208 will be covered by the document, so the image sensing element 114 cannot detect the reference pattern 208, so in step 306, the image sensing element 114 will be driven Used to scan documents located in the document carrier 200, in a preferred embodiment of the present invention, the image sensor 114 is a contact image sensor (contact image sensor-CIS), or uses a charge-coupled sensor Measuring element (charge coupled device-CCD).

Referring to FIG. 6 , it shows a schematic diagram of the reference pattern 208 , for example, the reference pattern 208 is a pattern with at least one black stripe on a white background, or a pattern with at least one white stripe on a black background.

The user of the present invention does not need to press any button to drive the scanning device, and the method of the present invention enables the scanning device to be activated automatically.

The embodiments of the present invention are described above, and those skilled in the art can make changes or modifications without departing from the spirit of the present invention, but these changes or equivalents are all included in the appended claims.

Claims (8)

1. A method for driving an image scanning device, the image scanning device has a document carrying device for carrying scanned documents, a first sensing element is arranged in the image scanning device to detect the document carrying device, and a second The sensing element is set in the image scanning device to scan the document, and the reference pattern is formed in the document carrying device as identification for driving the second sensing element, and the document carrying device can be fed into In the image scanning device, the method at least includes: First, the detecting element of the scanning device detects whether the document carrying device is located in the scanning device. If the detecting element detects that the document carrying device is already located in the scanning device, the above-mentioned image sensing element is driven to a preset position, which is located at directly above the reference pattern, and then the image sensing element starts to detect whether the document is in the document carrier, if the image sensing element can receive the reflection signal of the reference pattern, it means that the document is not in the document carrier, and the scanning device will not scan , if the document is placed in the document carrying device, the reference pattern will be covered by the document, so the image sensing element cannot detect the reference pattern, and the image sensing element will be driven to scan the document located in the document carrying device. 2. The method according to claim 1, wherein the image scanning device further comprises a D-type flip-flop for responding to the first sensing element, and the D-type flip-flop is transmitted according to the first sensing element Correspondingly, different signals are output from the output end of the D-type flip-flop, and the image sensing element is driven or not driven according to the output signal. 3. The method according to claim 2, wherein the first sensing element is a light sensing element for sensing whether the document carrying device is located in the scanning device. 4. The method according to claim 3, wherein the first sensing element comprises at least a light-emitting diode and a transistor, and when the document carrier is fed into the scanning device, the document carrier will be located between the light-emitting diode and the transistor , if the document carrying device is not in the scanning device, the transistor receives the light signal emitted by the light emitting diode, so that the first sensing element outputs a signal different from the design, on the contrary, if the document carrying device is located in the scanning device In this case, the transistor cannot receive the light signal emitted by the light emitting diode, so that the first sensing element outputs another signal. 5. The method according to claim 1, wherein the second sensing element is a contact image sensing element for detecting whether the document is located in the document carrying device. 6. The method of claim 1, wherein the second sensing element is a charge-coupled sensing element for detecting whether the document is located in the document carrier. 7. The method of claim 1, wherein the reference pattern is a pattern having at least one black stripe on a white background. 8. The method according to claim 1, wherein the reference pattern is a pattern with at least one white stripe on a black matrix.

Images