JP3893521B2 - Contact-type image detection device having digital signal output and signal output method thereof - Google Patents

Description

  The present invention relates to a contact-type image detection apparatus having a digital signal output and a signal output method thereof, and more particularly, to a light detection module, an optical / digital signal conversion module, an encoder module, and a decoding module. A contact type image sensing device having a digital signal output integrated with a module) and a signal output method thereof.

  A contact image sensor (CIS) is a type of linear sensor that scans flat images and text for storage, display, processing, or transmission as electro-optic elements. Used to make electronic forms. The greatest feature of the contact-type image sensor is the integrated module design, which is not only a lightweight feature in the applied product, but also facilitates assembly and saves production costs.

  Originally, the contact-type image sensor has advantages such as compactness and low cost, and it has been gradually adopted for various types of image application products. An important direction that must be improved in order to introduce a contact-type image sensor into a variety of application product systems, reducing the user design time and reducing costs. is there.

  In general, a contact-type image sensor is a device that detects an optical signal and converts it into an electric signal that can be read. The application range is wide, such as video processing devices that need to read characters, figures, and materials with electro-optic elements, such as scanners, copiers, and multifunctional office machines.

  All conventional contact-type image sensor designs are processing and transmission using analog signals, which are converted into digital signals when passing through an analog-to-digital converter (ADC) at the user's end. However, transmission using analog signals is susceptible to interference from external miscellaneous signals, and is affected by transfer line impedance and stray capacitance (condenser). This results in disadvantages such as a restriction that the voltage cannot be reduced and a change in the manufacturing process of the integrated circuit (IC).

  Therefore, as described above, it can be seen that the above-described existing contact-type image sensor has a drawback in actual use and further improvement is expected.

  Therefore, the present inventor considered that the above-mentioned drawbacks could be improved, and based on his experience engaged in this area for many years, he worked diligently on observation and research, matched with the application of science, rational design and The present invention has been devised to remedy the aforementioned drawbacks.

  A technical problem that needs to be solved by the present invention is to provide a contact-type image detection device having a digital signal output and a signal output method thereof, and a light detection module, a light / digital signal conversion module, a coding module, and a decoding. Through the integration of the conversion module, the method of transmitting signals from the pixel output to the user end is made digital signal transmission to the contact-type image detection device of the present invention, so that the decoding module can be converted into a conventional analog / digital conversion module. It is possible to replace this function with this, and a digital signal is output in parallel. With this design, apart from the fact that the light detection module is digital signal processing, all other structures are digital signal processing and transmission, which can greatly reduce the disadvantages of existing analog signal processing and transmission. .

  In order to solve the above technical problems, a digital image output contact type image sensing device is taken up based on one of the objects of the present invention (plan). It includes an optical detection module, an optical / digital signal conversion module, an encoding module and a decoding module.

  The optical detection module receives light and generates an optical signal, the optical / digital signal conversion module converts the optical signal generated by the optical detection module into a digital signal, and the encoding module converts the optical / digital signal The digital signal of the conversion module is converted into a serial output, and the decoding module converts the serial output of the encoding module into a parallel digital signal output.

  In order to solve the above technical problem, a signal output method of a contact-type image detection device for digital signal output is taken up based on one of the objects of the present invention. It includes the following steps: First, receiving light by the light detection module and generating an optical signal, then converting the optical signal generated by the light detection module into a digital signal by the optical / digital signal conversion module, and The step of converting the digital signal converted by the optical / digital signal conversion module into a serial output by the encoding module, and finally the step of converting the serial output of the encoding module into a parallel digital signal output.

  In order to solve the above technical problem, a digital image output contact type image detection device is taken up based on one of the objects of the present invention. It includes a timing signal generation module, a light detection module, an analog / digital conversion module, an encoding module, and a decoding module. The photodetection module receives light under the control of the timing signal generation module to generate an optical signal, and the analog / digital conversion module is used to convert the optical signal generated by the photodetection module into a digital signal. The encoding module is used to convert the digital signal of the analog / digital conversion module into a serial output, and the decoding module converts the serial output of the encoding module into a parallel digital signal output. Used for

  In order to solve the above technical problem, a signal output method of a contact-type image detection device for digital signal output is taken up based on one of the objects of the present invention. First, the timing signal generation module is picked up, then the light is received under the control of the timing signal generation module to generate an optical signal, and then the optical signal generated by the optical detection module is converted into a digital signal by the analog / digital conversion module. Next, the encoding module converts the digital signal of the analog / digital conversion module into a serial output, and finally the decoding module converts the serial output of the encoding module into a parallel digital signal output. .

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to better understand the technology, means, and effects that the present invention has adopted to achieve its intended purpose, the objects, features, and advantages of the present invention will be described more specifically with reference to the accompanying drawings relating to the present invention. I'm sure you can understand. However, the attached drawings are provided for reference and explanation only and are not intended to be used by those who restrict the present invention.

  FIG. 1 is a block diagram of a first embodiment showing the functions of a contact-type image detection device having a digital signal output according to the present invention. As shown in the drawings, the present invention employs a contact-type image detection device having a digital signal output. Among them, the optical detection module 10, the optical / digital signal conversion module 20, the encoding module 30 and the decoding module 40 are included. The light detection module 10 is a complementary metal-oxide semiconductor (CMOS) light detection array group, and the light detection module 10 is used to receive light and generate an optical signal.

  The optical / digital signal conversion module 20 is used to convert an optical signal generated by the optical detection module 10 into a digital signal, and the digital signal is a digital pixel.

  The encoding module 30 is used to convert the digital signal of the optical / digital signal conversion module 20 into a serial output, and the encoding module therein is an encoder. The decoding module 40 is used to convert the serial output of the encoding module 30 into a parallel digital signal output, in which the decoding module is a decoder, and the decoding module 40 is used. It is installed at the person's end.

  FIG. 2 is a flowchart of the first embodiment showing the function of the contact-type image detection apparatus having a digital signal output according to the present invention. As can be seen from the flowchart, the present invention adopts the signal output method of the contact-type image detection device. It has the following steps: First, receiving light by the light detection module to generate an optical signal (S100), then converting the optical signal generated by the light detection module to a digital signal by the optical / digital signal conversion module (S102), Thereafter, the encoding module converts the digital signal of the optical / digital signal conversion module into a serial output (S104). Finally, the decoding module converts the serial output of the encoding module into a parallel digital signal output. Step (S106).

  In the present invention, the signal transmission method of the optical / digital signal conversion module 20 is entirely digital signal transmission, passes through the encoding module 30 and is converted into serial output, and the decoding module 40 functions as an analog / digital conversion module. Is replaced by parallel output of digital signals.

  Thus, the design of the present invention not only reduces the light detection module to digital signals, but all other modules are all digital signal transmission and processing, greatly reducing the disadvantages of analog signals. Among them, the encoding module 30 and the decoding module 40 have functions for correcting digital signal errors such as digital signal delay correction, data loss compensation, and image distortion correction, and output digital signals in parallel. However, the function of the analog / digital conversion module at the end of the user system of the book is replaced, and the cost of the user end system is reduced.

  The decoding module 40 can be installed on the contact-type image detection device side or the user system module side. When the application product is a scanner or a multifunctional office machine, it is necessary to connect using a long connection line. When installed on the contact-type image detection device side, the connection line becomes thicker in order to output signals in parallel (for example, in the case of 16 bits, a connection line that is 16 lines thicker than the original one is required), and the system configuration This will cause problems in the design, and the influence of electromagnetic interference (EMI) will be greater, so if the decoding module is installed at the end of the user system, the image of the contact-type image detection device and the system module The material is connected with only one serial signal, which brings great benefits to the overall system design.

  In addition, FIG. 3 is a block diagram of a second embodiment showing the function of the contact-type image detection apparatus having a digital signal output according to the present invention. As shown in the drawings, the present invention employs a contact-type image detection device having a digital signal output. Among them, a timing signal generation module 50, a light detection module 10, an analog / digital conversion module 60, an encoding module 30 and a decoding module 40 are included. Among them, the timing signal generation module 50 is a timing signal generator. The light detection module 10 receives light under the control of the timing signal generation module 50 and generates an optical signal. The photodetection module is a charge coupled device (CCD) photodetection array group. The analog / digital conversion module 60 is used to convert an optical signal generated by the light detection module 10 into a digital signal.

  In addition, the utility of the encoding module 30 and the decoding module 40 is the same as in the first embodiment. That is, the encoding module 30 is used to convert the digital signal of the analog / digital conversion module 60 into a serial output, and the decoding module 40 converts the serial output of the encoding module 30 into a parallel digital signal output. Used to do. The decryption module 40 can be installed at the user end.

  Incidentally, the difference between the CMOS and the CCD is that the CCD photosensitive module cannot be integrated on the same chip A as the digital control circuit, and must be controlled by another timing control generation module 50, and the timing signal generation module 50 This is because the analog / digital conversion module 60 and the encoding module 30 can be integrated on the same chip A.

  In addition, FIG. 4 is a flowchart of the second embodiment showing the function of the contact-type image detection apparatus having a digital signal output according to the present invention. As can be seen from the flowchart, the present invention adopts the signal output method of the contact-type image detection device. It has the following steps: First, the timing signal generation module 50 is picked up (S200), and then the optical detection module 10 receives light and generates an optical signal (S202) under the control of the timing signal generation module 50, and then analog / digital The optical signal generated by the optical detection module 10 is converted into a digital signal by the conversion module 60 (S204). Subsequently, the digital signal of the analog / digital conversion module 60 is converted into a serial output by the encoding module 30 (S206). The decoding module 40 converts the serial output of the encoding module 30 into a parallel digital signal output (S208). As described above, the present invention is a contact-type image detection module having a digital signal output, and has the functions of improving image quality, improving the simplicity of product application system design, suppressing power consumption, and reducing costs. .

  Therefore, the present invention is actually a rare practical new product, has high novelty and inventive step, and perfectly meets the requirements for filing an invention patent.

  However, what has been described above is merely a detailed description and schematic representation of one specific embodiment of the best of the present invention, and is merely illustrative of the features of the present invention and is not limited thereto. Rather, it is not used to limit the invention, but the full scope of the invention is based on the claims (claims), and is generally similar to the spirit of the claims of the invention and variations thereof. Anything that meets the examples is within the scope of the present invention, and no matter how skilled or knowledgeable in the field, any modification or modification within the scope of the present invention can easily be considered in the claims of this proposal. Belong.

It is a block diagram of the 1st Example showing the function of the contact-type image | video detection apparatus provided with the digital signal output by this invention (the decoding module is installed in the user end). It is a flowchart of the 1st Example showing the function of the contact-type image | video detection apparatus provided with the digital signal output by this invention. It is a block diagram of the 2nd Example showing the function of the contact-type image | video detection apparatus provided with the digital signal output by this invention (the decoding module is installed in the user end). It is a flowchart of the 2nd Example showing the function of the contact-type image | video detection apparatus provided with the digital signal output by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Optical detection module 20 Optical / digital signal conversion module 30 Encoding module 40 Decoding module 50 Timing signal generation module 60 Analog / digital conversion module A chip

Claims (8)

A CMOS sensor array that receives light and generates an optical signal, an optical / digital signal conversion module that converts the optical signal generated by the optical detection module into a digital signal, and the optical / digital signal conversion module An encoding module that converts a digital signal into a serial output, and a decoding module that converts the serial output of the encoding module into a parallel digital signal output ,
The decryption module is located at the user end,
Optical sensing module, the optical / digital signal conversion module and encoding module, the contact type image sensing device having a digital signal output, characterized in that that will be integrated in one chip. 2. The contact-type image detection apparatus having a digital signal output according to claim 1, wherein the digital signal is a digital pixel . 2. The contact-type image detection apparatus having a digital signal output according to claim 1, wherein the encoding module is an encoder . 2. The contact-type image detection apparatus having a digital signal output according to claim 1, wherein the decoding module is a decoder . A step of preparing a chip in which a light detection module, a light / digital signal conversion module and a coding module are integrated; a step of receiving light by a light detection module which is a CMOS sensor array; A step of converting an optical signal generated by the light detection module into a digital signal by a digital signal conversion module, a step of converting a digital signal of the light / digital signal conversion module into a serial output by a coding module, and a decoding Converting a serial output of the encoding module into a parallel digital signal output by an encoding module,
Decryption module is located at the user end
A signal output method for a contact-type image detection device having a digital signal output . 6. The signal output method for a contact-type image detection apparatus having a digital signal output according to claim 5, wherein the digital signal is a digital pixel . 6. The signal output method for a contact-type image detection apparatus having a digital signal output according to claim 5, wherein the encoding module is an encoder . 6. The signal output method of a contact-type image detection apparatus having a digital signal output according to claim 5, wherein the decoding module is a decoder .

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