TW392129B - Digitizing apparatus for bar code reader and operation method thereof - Google Patents

Abstract

The present invention relates to a digitizing apparatus for bar code reader which employs an analog-to-digital converter to receive the analog signal of bar code image and to convert that into digital data. A microprocessor executes operation method to read the digital data and to convert that into pulse signal output and generate time sequence and control signal. The invention can improve the shortcoming that the conventional bar code reader uses lots of components and therefore it can reduce the count of components used, shrink the volume, reduce the cost, simplify the production processes, and achieve low distortion and high scanning rate.

Description

V. Description of the invention (1) The present invention relates to the improvement of a bar code scanner, especially a digitizing device for a bar code scanner. It is very common to encode information by light, such as the use of bar codes. There are even domestic and international product packaging. Most of the domestic and large stores have changed to traditional bar code input with manual keyboard input which is time-consuming and often mistaken. This type of bar code input system, in addition to entering the sales of Shima, displays the amount of goods, and its goods inventory or sales volume benefits and Future orders and other matters can be handed over to the computer for such inventory. It is easy to understand the inventory, reducing the manual inventory time, and counting which can improve the business efficiency of the products of the card gate. The bar code system contains a series of bright and dark areas. typical The width of the dark area of the rectangular pattern Λ or the width of the light space between the bars represents the coding information. To decode a bar code symbol and digest the coded information, one of the current bar code scanner technologies is the use of photoelectric coupling technology. Please refer to Fig.1. One of the barcodes to be scanned is illuminated by the light source module 1 / »> > The reflected light signal is transmitted to the lens 3 0. After focusing, y is sensed by the image sensor 4 0. The analog electrical signal of the table encoding information is processed by a digitizing device 50 to generate a pulse wave signal. The width and space ratio between these pulse waves corresponds to the width of the bar and space between the bar codes and is digitized. The pulse wave signal of device 5 0 is applied to 1 decoder 6 0. This decoder 6 0 first determines the pulse width and space and then analyzes the width and space to find Find and decode --- coded barcode information provides a digital data output for computer processing 〇 〇

Pl-9014.ptd Page 4 V. Description of the invention After the above circuit is installed, what is the point of the controlled amplifier (IZER) No. 5 is a single or controlled circuit? There are many pieces. The small level T 2 in the number is solved. The wrong type of low-density dynamics corresponds to the barcode scanning pulse signal generation is more accurate and easy to generate. It is necessary to use the process steps. This digitizing device 5 0 Figure, in the image sensing system circuit 5 2's control PRE-AMP) 5 4% 6 'This digitizer 5 represents a marginal edge limit space, different bars 8 are used to control the power supply and any symbolic bar code B 2 with a fixed limit range is a limit position The quasi-T 1 digital change produces more bar code information than the digitizer's bar code scanning error; the print character number, the point of the reference matrix, but the scanner detects the pulse wave signal A 4 of the class A 3 'with a southern threshold. Wide and narrow distortion operators are complicated by manual methods.爰 is the main purpose of Ming. Please refer to Figure 2. Device 40 receives the pulse and wave generated by countermeasures. After the signal is amplified, the threshold is set by the threshold quasi-definition signal. There is different information. . From the figure, the bar code of the bar level that can clearly determine the limit level, for example, the pulse wave signal of the relatively high-density printer bar code scanner A scanner generates an error and the scanned bar 3 B picture, this The time class makes it possible to have a small transposition T 2 digitizer within a low threshold ratio signal. In addition, the threshold limit B is fixed, so that the read-rate-adjusted signal amplitude is to provide a pulsed modulation signal of the scanning light emitted by a conventional digital device through a digital digitizer (DIGIT level determines an analog signal). The copy code used for reading and identifying 'another power control' can only read: please refer to the character number in Figure 3A, the pulse signal will be detected in the analog letter 1, but with a high threshold A 2 code B 4 is a bit-matrix signal that has a small shift level T 1 digitized and a bar code scanner produced by a bar code scanner that produces an error is reduced, and the process determines the threshold is only accurate, low distortion, High reading V. Description of the invention (3) The bar code scanner with a high rate of reading makes a high percentage of success for each reading. The digital device is a digital device, the digital device is a digital device, and the digital device is a converter (A / D is read by digital data method, and the function of 0 is used to manually adjust a low-loss effect. Please refer to the figure for details. As shown in the figure, the secondary purpose is to provide a barcode with few components. Scanning device. Another purpose is to simplify the device. Another purpose is to simplify manual adjustment, which is to provide a small volume of barcode scanning, that is, to provide a barcode scanner for digits, which simplifies the manufacturing process and facilitates mass production and maintenance. The purpose is to provide a low-cost barcode scanning device. To achieve the above-mentioned objectives, the present invention mainly uses a converter to receive analogs of barcode images, and the microcontroller (Micr 〇C ο ntr ο 1) and processes to identify these digits The data is transformed into generating timing and control signals; it is known, but its required components are greatly reduced, and the real time (real ti me) recognizes such digital data, the signal amplitude, and forms the correct pulse wave signal. Scanner scanner with a low read rate. Allow your reviewers to have a better understanding of the purpose of the present invention, and with a better understanding: As shown by your reviewers, the present invention is an analog digital transfer signal and transfers it. 1 er) digitizing device for executing pulse signal output 5 It is clear that when using micro-control production, it is not necessary to make breakthroughs in the past, characteristics and achieved examples and Detailed reading of the formula 4, a block-based bit circuit of the present invention apparatus 70 comprises: a filter and square

Pl-9014.ptd Page 6 V. Description of the invention (4) Amplifier (Filter & Amplifier) 7 2. A power supply control circuit 7 4, an analog-to-digital converter 76 and a microcontroller 7 8. Among them, after the reflected scanning light is received by the image sensor 40, after the timing and control signals of the microcontroller 7 8 are generated, the analog electrical signals generated are filtered and filtered by the amplifier 7 2 and then amplified by the analog digital The converter 7 6 receives and intercepts the digital data (A / D DATA) output at a certain frequency, reads it through the microcontroller 7 8 and processes it in real time according to the internal program to identify the digital data and convert it into a pulse signal output. In order to apply to the decoder 60 to determine the pulse width and space, and then analyze the width and space to find and decode a coded barcode message. In addition, the power control circuit 74 of this circuit is also controlled by the microcontroller 78. It is used to provide power for the device of the present invention. See Figure 5 for a detailed circuit diagram of the present invention. Compared with the traditional digitizing device 50, please refer to FIG. 2. It is obvious that the present invention greatly reduces the number of components used, which simplifies the manufacturing process and does not need to rely on manual adjustment for mass production. The overall circuit Reduced size and cost. Referring again to FIG. 6, it is a main flowchart of the internal control program of the microcontroller 78 used in the present invention. The main steps performed are: Step 8 0 0 • Initialize the microcontroller 7 8 system; Step 8 1 0 • Detect whether the power-on (POWER ENABLE) PE signal is valid, and if not, enter the standby mode PE —0; Step 8 2 0 · Supply power, start the image sensor timing CCD CLK and control signal and set the Start Of Scan S0S signal as a high state timer; Step 8 3 0 · Set the appropriate threshold level;

Pl-9014.ptd Page 7 、 Explanation of the invention (5) Information 0. Read the digital digit “A” output by the analog-to-digital converter 76 and identify the corresponding pulse wave signal. Scan yt-step by step description, when the user controls the use of the bar code of the present invention, the use signal is received by the decoder 60, the output power is activated: the number is based on the microcontroller 7 8, the microcontroller 7 8 according to This power starts PE

The “ci number starts” to respond to the power required by the circuit, and start the image sensor timing D C ± LK signal and set to start scanning the SOS signal as a high state timer, and then. Real-time processing of analog-to-digital converter 7 6 digital data into pulse wave signals. The above-mentioned start scanning sos signal is to start the decoder 6 u ^ synchronously read the microcontroller 7 8 to output the pulse wave signal and decode it. The frequency of the start scanning SOS signal can be set as required by the system. Once decoded The decoder 60 successfully canceled the power-on PE signal and forced the microcontroller 78 to enter standby mode to achieve the purpose of saving power. Refer to Figures 7A ~ 7E for detailed flow chart of this control program. As shown in the figure, 'controller method implemented by microcontroller 7 8 is added at any time from 〇〇 to detect whether the scanning S0s signal is high. If not, enter s〇s — L0 / subroutine'. Figure 7 E. Set the start scan SOS signal to low state timer 'and detect the start scan sos signal low state timer. If it expires, go back to step 804.

'Please continue to refer to Figures 7A ~ 7D for further explanation, in which step 8 0 0 initializes the micro controller. The system of device 88 includes: Step 8 0 2. Reset the PD of microcontroller 7 8 Pin input / output (work / 〇) mode, initialize PD pin data; Step 8 0 4. Disable interrupt, clear all registers, random storage

V. Description of the invention (6) Take the memory and set the input / output (I / 0) mode. Step 8 1 0 detects whether the power-on (POWER ENABLE) PE signal is valid, and if not, enters the standby mode PE_0; please refer to FIG. 7D, where the step of the standby mode PE_0 includes: Step 8 1 2, Interrupt is prohibited; step 8 1 4 sends a control signal to stop power supply; step 8 1 6 starts the power to start the PE signal; the rising edge of the PE signal is interrupted to stand by to return to normal operation; and step 8 1 8 enters the idle (SLEEP) mode and then Go back to step 0 0 0 4 ° Step 8 3 0 Set the appropriate critical level; it contains: Step 8 3 2 · Read the first sample as basic data; Step 8 3 4 · Find the first pulse A falling edge and setting step 8 3 6 · Find the first rising edge of the pulse and set it, Step 8 3 8 · Find the second falling edge of the pulse and set it to the end, as shown in Figure 7 C As shown, step 8 4 0 includes: Step 8 4 2 · Repeatedly detect whether the analog-to-digital converter timing A / D CLK is high, and if so, read the digital data A / D DATA of the analog-to-digital converter. And look for digital assets at low peaks Entering a low peak point of the process; repeat step 844 · Timing detecting digital converter A / D CLK whether

Pl-9014.ptd Page 9 V. Description of the invention (7) High state, if it is, read the digital data A / D DATA of the analog digital converter, and look for the digital data at the peak point, enter the peak point processing process to To read the digital data output by the analog digital converter and identify and generate a corresponding pulse wave signal. The width and space ratio between these pulse waves corresponds to the width of the bar and space between the barcodes. It is applied to the decoder 60 to determine the pulse width and space, and then analyze the width and space to find and decode the coded bar code message.

As can be seen from the above, the present invention breaks through the previous method of generating pulse wave signals by processing analog electrical signals of image sensors using voltage threshold levels, using the concept of digitization, and using analog digital converters and microcontrollers to replace control circuits and timing The complex circuit of the signal generator and digitizer can achieve the multiple purposes of reducing components, reducing volume, reducing costs, simplifying manual adjustment operations, simplifying the process and realizing low-distortion and high-reading rates. However, the above are only the preferred embodiments of the present invention. When the scope of the patent of the present invention cannot be limited, that is, all equal changes and modifications made in accordance with the scope of the patent application of the present invention should still belong to the patent Covered. (I) Simple illustration of the schema:

Figure 1: System block diagram of a conventional barcode scanner. Figure 2: Circuit diagram of a conventional digitizing device. Figure 3A: The schematic diagram of a signal generated by scanning a relatively high-density printing number. Figure 3B: The signal generated by scanning the dot matrix low-density printing characters

Pl-9014.ptd Page 11

Claims (1)

Sixth, apply for the scope of patent application 1. An analogy and a micro-control and production 2. If the application contains a control letter amplification, 3. If an application is set up, provide a 4. Micro-control a • Initial b • Detection Formula c • Supply system d • Set e • Read production 5. If you apply for a control code to scan the digits and turn it into a controller, the patent sequence of the time sequence has a filter number, which will be entered into the patent range and includes a power supply. The control of the code scanner initiates the test power supply. It should be based on the system signal and determine the appropriate analog analog phase patent method. Its digital device includes: a converter, which is used to receive the digital data of the analog signal of the barcode image; And read these digital data into pulse wave signal output and control signal. The digitizing device for the barcode scanner surrounding item 1 is spread to the amplifier, and the noise is filtered in advance according to the timing of the microcontroller and the analog signal of the barcode image and the analog digital converter. The barcode scanner around item 1 or 2 uses a digitally-equipped power supply control circuit, and the microcontroller controls the control method of the fast-to-use digitalized device. The program includes the steps: 'Microcontroller system; whether the activation signal is valid, If not, then enter the power required by the standby mode, start an image sensing setting and start scanning the signal to a high state, such as the critical level of the control; and the state, the digital data output by the digital converter, and the corresponding pulse wave signal . , ’’ Sub-identification ,: for item 4 of the barcode scanner, step a includes: PB 9014.ptd Page 12 6. Scope of Patent Application a 1 · a 2 · Reset the I / O mode of the PD pin of the microcontroller and initialize the PD connection 6 7 8 If the applicant applies: If you want to apply for control again, you can: Detect, open, scan, detect, open a 2 If you apply for control, read the first pulse to find the pulse data; The power supply source starts the signal setting mode; and to step a 2 of the patent scope law, it also includes the start scanning signal is low and the start scanning signal clears all register scanner entry (I / 0) mode 5 items of barcode scanner steps. Enter the standby mode and random access memory in b. The steps of using the digitizing device are the control signals included. The rising edge is interrupted to restore the system. The barcode scanner of 5 items can add a step to the digitizing device at any time. The steps include whether 0 is a high-status timer; and if the low-status timer is not set, the scan is started. If the timeout expires, it returns to step 4 of the patent scope. Code scanner by means of digitizing method, wherein step d comprises: as the basic information; falling edge, and the set; rising edge, and the set; and a sample, a first punch of a first punch Pl-9014, ptd page 13 Patent application scope Find the second falling edge of the pulse and set it. 9. If the method of controlling a digitizing device for a barcode scanner as described in item 4 of the patent application, step e includes: repeatedly detecting whether an analog-to-digital converter timing is high, and if so, reading the analog-to-digital converter Output the digital data, find the digital data at the low peak point, and enter the low peak point processing process; and repeatedly detect whether the analog digital converter timing is high, and if so, read the output of the analog digital converter Digital data, and looking for digital data at the peak point, enter the peak point processing process. 〇 Pl-9014.ptd Page 14