Phototube-based high-speed OMR coating point input device
By using photovoltaic array and signal conditioning circuit in the OMR coating point entry device, combined with programmable logic controller and drive device, the problem of low flexibility and accuracy is solved, and the multiple OMR forms and different lighting conditions are realized. efficient entry.
Patent Information
- Application Number
- CN202420903672.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-28
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-28
AI Technical Summary
The existing OMR coating point input devices have poor flexibility and low accuracy, and require specific OMR form designs, and changes in external light intensity and angles affect the entry accuracy.
Using a high-speed OMR coating point input device based on photovoltaics, including a photovoltaic array, an analog-to-digital conversion board and a data interface board, the electrical signals are amplified and noise-reduced through signal conditioning circuits, combined with a programmable logic controller and PCI controller, to realize High-speed data transmission, and the height and lighting angle of the cardboard are adjusted through the drive device to adapt to different lighting conditions.
It improves the flexibility and adaptability of the coating point input device, can adapt to a variety of OMR form layouts and lighting conditions, and enhances the entry accuracy and speed.
Smart Images
Figure CN222189890U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the OMR technical field, in particular to a high-speed OMR dot-painting and recording device based on a photoelectric tube. Background Art
[0002] In the prior art, OMR technology can collect a large amount of data quickly and accurately. The OMR dot-marking entry device can automatically scan the OMR answer sheet and record the dot-marking information. Compared with traditional manual entry, the OMR dot-marking entry device can provide high-speed, accurate and convenient data processing capabilities to meet the needs of large-scale data collection and processing. It has broad application prospects in education, examinations and surveys, and has high commercial value and market competitiveness. However, the current OMR dot-marking entry device usually needs to use a specific OMR form design to ensure that the dot-marking information can be accurately read, which limits the flexibility and adaptability of the entry device, and requires additional time and cost to design and print specific OMR forms. In addition, the accuracy of the OMR dot-marking entry device is greatly affected by external factors. When the light intensity and light angle in the environment change greatly, it will affect the working effect of its internal sensor, thereby affecting the accuracy of the entry. At this stage, a high-speed OMR dot-marking entry device based on a photoelectric tube is needed. Utility Model Content
[0003] In order to solve the problems of poor adaptability and low accuracy existing in the OMR dot-marking and recording device, the utility model provides a high-speed OMR dot-marking and recording device based on a photoelectric tube.
[0004] The utility model provides a high-speed OMR coating point recording device based on a photoelectric tube, which adopts the following technical solutions:
[0005] A high-speed OMR dot-marking recording device based on a photoelectric tube comprises: a support module and a dot-marking collection module installed inside the support module; the dot-marking collection module comprises a photoelectric tube array, an analog-to-digital conversion board and a data interface board, a signal conditioning circuit is provided at a signal input end of the analog-to-digital conversion board, the photoelectric tube array is connected to the analog-to-digital conversion board through the signal conditioning circuit, and a signal output end of the analog-to-digital conversion board is connected to the data interface board;
[0006] The support module includes a support frame, a transverse support rod is installed on the upper end of the support frame, the transverse support rod provides a mounting point for the photoelectric tube array, an insertion slot is provided in the upper panel of the support frame, and the analog-to-digital conversion board and the data interface board are embedded in the insertion slot.
[0007] Furthermore, the data interface board includes a buffer, a programmable logic controller and a PCI controller, the programmable logic controller is connected to the control ends of the buffer and the PCI controller respectively, and the signal output end of the buffer is connected to the PCI controller.
[0008] Furthermore, a line tube is provided at the bottom of the insertion slot, and the line tube passes through the upper panel of the support frame. The data line of the photoelectric tube array is connected to the connection analog-to-digital conversion board inside the insertion slot through the line tube.
[0009] Furthermore, the analog-to-digital conversion board includes an analog-to-digital converter, a single-chip microcomputer and a programmable gate array chip, the signal output end of the analog-to-digital converter is connected to the programmable gate array chip, and the signal output end of the single-chip microcomputer is connected to the configuration register in the analog-to-digital converter.
[0010] Furthermore, the signal conditioning circuit includes a transimpedance amplifier and a feedback capacitor, the signal output end of the phototube array is connected to the transimpedance amplifier, one end of the feedback capacitor is connected to the reverse input end of the transimpedance amplifier, the other end of the feedback capacitor is connected to the output end of the transimpedance amplifier, and the output end of the transimpedance amplifier is connected to the input end of the analog-to-digital converter.
[0011] Furthermore, the transverse support rod provides a mounting point for the photoelectric tube array, including a groove provided on the surface of the transverse support rod, a roller is installed on the upper end of the housing of the photoelectric tube array, and the roller is embedded in the groove.
[0012] Furthermore, the PCI controller has a built-in PCI interface, and the PCI controller is connected to a PC mainboard via the PCI interface.
[0013] Furthermore, a driving device is provided on the back of the panel of the supporting frame, and a controller of the driving device is connected to a PC mainboard via a PCI controller.
[0014] Furthermore, a vertical support rod is provided inside the support frame, one end of the vertical support rod is connected to the bottom of the support frame through a fixing bolt, and the other end of the vertical support rod is connected to the middle part of the transverse support rod.
[0015] Furthermore, a paper support is installed on the surface of the vertical support rod, the center point of the paper support corresponds to the scanning port of the photoelectric tube array, a conveying chain is provided on the side of the paper support close to the supporting frame panel, and the paper support is connected to the driving device through the conveying chain.
[0016] In summary, the utility model has the following beneficial technical effects:
[0017] 1. The utility model adopts a photoelectric tube array in the scanning part to receive the reflected light from the "dot" position. OMR forms of different formats may have different layouts and marking methods, such as boxes, circles, squares, etc. The photoelectric tube array determines whether there is a dot based on the intensity of the reflected light. It is not limited to the specific shape of the dot and can adapt to OMR forms of various shapes, thereby improving the flexibility and adaptability of the dot entry device.
[0018] 2. The utility model connects the paper support via a driving device, and can adjust the height of the paper support, thereby changing the illumination angle, slowing down large changes in the illumination angle, and preventing reflected light from directly acting on the receiving part of the photoelectric tube array, thereby improving the adaptability of the dot-coating entry device under different light intensities.
[0019] 3. The utility model connects the analog-to-digital conversion board through the signal conditioning circuit, amplifies and reduces the noise of the electrical signal transmitted by the photoelectric tube array, improves the accuracy of the input device, and realizes high-speed data and command transmission between the PC motherboard through the data interface board, which is used for rapid and accurate identification of the coating points. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a front view of a high-speed OMR dot-painting and recording device based on a photoelectric tube in an embodiment of the utility model.
[0021] Figure 2 It is a schematic diagram of the back side of a panel in a high-speed OMR dot-painting and recording device based on a photoelectric tube in an embodiment of the utility model.
[0022] Figure 3 It is a connection diagram of the coating point collection module in the embodiment of the utility model.
[0023] Figure 4 It is a connection diagram of the signal conditioning circuit in the embodiment of the utility model.
[0024] Among them, 1. Photoelectric tube array; 2. Paper support board; 3. Paper support board bracket; 4. Vertical support rod; 5. Horizontal support rod; 6. Adjustment bracket; 7. Roller; 8. Conveyor chain; 9. Vertical adjustment rod; 10. Adjustment base; 11. Stepper motor. DETAILED DESCRIPTION
[0025] The utility model is further described in detail below in conjunction with the accompanying drawings.
[0026] Example 1
[0027] Reference Figure 1 , a high-speed OMR dot-painting and recording device based on a photoelectric tube in this embodiment includes:
[0028] A support module and a coating point collection module installed inside the support module; the coating point collection module includes a photoelectric tube array, an analog-to-digital conversion board and a data interface board, the signal input end of the analog-to-digital conversion board is provided with a signal conditioning circuit, the photoelectric tube array is connected to the analog-to-digital conversion board through the signal conditioning circuit, and the signal output end of the analog-to-digital conversion board is connected to the data interface board;
[0029] The support module includes a support frame, a transverse support rod is installed on the upper end of the support frame, the transverse support rod provides a mounting point for the photoelectric tube array, an insertion slot is provided in the upper panel of the support frame, and the analog-to-digital conversion board and the data interface board are embedded in the insertion slot.
[0030] The data interface board comprises a buffer, a programmable logic controller and a PCI controller. The programmable logic controller is respectively connected to the control ends of the buffer and the PCI controller, and the signal output end of the buffer is connected to the PCI controller.
[0031] A line tube is provided at the bottom of the insertion slot, and the line tube passes through the upper panel of the support frame. The data line of the photoelectric tube array is connected to the connection analog-to-digital conversion board inside the insertion slot through the line tube.
[0032] The analog-to-digital conversion board includes an analog-to-digital converter, a single-chip microcomputer and a programmable gate array chip. The signal output end of the analog-to-digital converter is connected to the programmable gate array chip, and the signal output end of the single-chip microcomputer is connected to the configuration register in the analog-to-digital converter.
[0033] The signal conditioning circuit includes a transimpedance amplifier and a feedback capacitor. The signal output end of the photoelectric tube array is connected to the transimpedance amplifier, one end of the feedback capacitor is connected to the inverting input end of the transimpedance amplifier, and the other end of the feedback capacitor is connected to the output end of the transimpedance amplifier. The output end of the transimpedance amplifier is connected to the input end of the analog-to-digital converter.
[0034] The transverse support rod provides a mounting point for the photoelectric tube array, including a groove on the surface of the transverse support rod, a roller is installed on the upper end of the housing of the photoelectric tube array, and the roller is embedded in the groove.
[0035] The PCI controller has a built-in PCI interface, and the PCI controller is connected to a PC mainboard via the PCI interface.
[0036] A driving device is arranged at the back of the panel of the supporting frame, and a controller of the driving device is connected to a PC mainboard via a PCI controller.
[0037] A vertical support rod is arranged inside the support frame, one end of the vertical support rod is connected to the bottom of the support frame through a fixing bolt, and the other end of the vertical support rod is connected to the middle part of the transverse support rod.
[0038] A paper support is installed on the surface of the vertical support rod, the center point of the paper support corresponds to the scanning port of the photoelectric tube array, a conveying chain is provided on the side of the paper support close to the supporting frame panel, and the paper support is connected to the driving device through the conveying chain.
[0039] Specifically,
[0040] A high-speed OMR dot recording device based on a photoelectric tube in this embodiment includes the following contents:
[0041] like Figure 1 As shown, the photoelectric tube array 1 is a linear array composed of multiple photoelectric tubes, and is arranged in the form of a row and column matrix. The photoelectric tube is divided into two parts. One is the light source device responsible for irradiating light to the coating point, and the other is the receiving device, which receives the reflected light from the coating point position. Each photoelectric tube can detect a coating point on the OMR form. The photoelectric tube array 1 determines whether there is a coating point based on the intensity of the reflected light, and is not limited to the specific shape of the coating point. The photoelectric tube array 1 is installed in the groove on the surface of the horizontal support rod 5 through the roller 7. An adjusting bolt is installed above the roller 7. After the position of the photoelectric tube array 1 is determined, the adjusting bolt is rotated so that it can be stuck in the groove to complete the fixation. Adjustment brackets 6 are respectively provided on both sides of the horizontal support rod 5. The adjustment brackets 6 are installed in the device The side wall is mainly used to adjust the height of the transverse support rod 5. The side wall surface is evenly provided with adjustment holes. One end of the adjustment bracket 6 is inserted into the adjustment hole and fixed by bolts. The adjustment of the transverse support rod 5 is generally only fine-tuned. Only when the height difference between the supporting paper board 2 and the transverse support rod 5 is large to avoid external light, the transverse support rod 5 is adjusted. The position relationships such as "upper", "lower", "left", "right", "inside" and "outside" used in the utility model are based on the position relationships shown in the accompanying drawings. A supporting paper board bracket 3 is provided under the supporting paper board 2. The supporting paper board 2 is fixed to the upper side of the supporting paper board bracket 3 by fixing bolts. A through hole is provided inside the supporting paper board bracket 3. The vertical support rod 4 passes through the through hole to penetrate the supporting paper board bracket 3 to complete the connection.
[0042] like Figure 2As shown, a conveying chain 8 is provided on the side of the paper support 2 close to the supporting frame panel, and the conveying chain 8 is connected to the stepping motor and the paper support bracket 3 at the same time, including the supporting frame panel provided with an adjustment slot, and the paper support bracket 3 passes through the supporting frame panel through the adjustment slot on the side close to the supporting frame panel, and is fixedly connected with the adjustment base 10 on the back of the panel, and the adjustment base 10 clamps the conveying chain 8 and is fixed on the outside of the vertical adjustment rod 9, and the vertical adjustment rod 9 is parallel to the adjustment slot of the supporting panel and is provided with an adjustment hole on its surface, and when the position of the paper support needs to be fixed, the adjusting base 10 is inserted into the adjustment hole , to realize the driving operation with the stepper motor. The stepper motor 11 is used as a driving device, and the up and down adjustment of the paper support bracket 3 can be completed through the transmission chain 8. The controller of the stepper motor 11 is connected to the PCI controller through a connecting line, and the PCI controller transmits the driving information to the PC motherboard. The stepper motor is configured and controlled through the control interface provided by the operating system. The control panel of the operating system provides more advanced and fine-grained configuration options, including the adjustment of step angle parameters. The control interface provided by the operating system is a mature existing technology and will not be explained in detail in this embodiment.
[0043] like Figure 3As shown, after the photoelectric tube array completes signal acquisition through the above-mentioned mechanical device, the signal transmission to the PC mainboard is completed through the analog-to-digital conversion board and the data interface board. The photoelectric tube array is connected to the analog-to-digital converter through the signal conditioning circuit. The analog-to-digital conversion board includes an analog-to-digital converter, a single-chip microcomputer and a programmable gate array chip FPGA. The single-chip microcomputer adopts the W78LE516 chip to realize the configuration of the internal registers of the analog-to-digital converter chip. After the system is powered on, the program stored in the internal memory of the single-chip microcomputer configures the four analog-to-digital converter chips to complete the initialization of their internal registers so that they work according to the preset working mode. The programmable gate array chip adopts EP1C6T144C8 to realize control signal generation, conversion and data preprocessing. The programmable gate array chip F The PGA includes a clock module, which receives a 40MHz master clock as input and generates a clock signal inside the FPGA. The programmable gate array chip counts and divides the 40MHz master clock provided by the analog-to-digital conversion board, and provides the sampling timing pulse signal VSMP, ADC master clock signal MCLK and digital output enable signal OEB required by the four analog-to-digital conversion chips, and controls the four analog-to-digital converters to convert the 8-channel analog quantity output by the photoelectric tube array, that is, each analog-to-digital converter is responsible for 2 channels, into 8-bit digital quantities, two channels in a group, and sequentially output to the 8-bit digital quantity output port of each analog-to-digital converter. Under the control of the write clock buffer WCLK provided by the programmable logic gate array, the row number mark and the extracted analog-to-digital conversion result are sent to the buffer. The buffer uses a memory chip IDT72V36110 as a data buffer memory. When the buffer is half full of 64k double words, a buffer half-full signal is issued to notify the PCI dedicated interface chip PCI controller to read the data of these 64k double words and transmit them to the PC motherboard at a rate of 66MHz. During the PCI controller reading data, the data from the analog-to-digital conversion board is stored in the free space in the buffer, thereby achieving uninterrupted caching of data. During these operations, the programmable logic controller counts, compares and converts the signals from the buffer, the programmable gate array chip and the onboard crystal oscillator to ensure that the actions of the three can be coordinated.
[0044] like Figure 4As shown, the output signal of the phototube array needs to be conditioned by the signal conditioning circuit before entering the analog-to-digital conversion board. The signal conditioning circuit includes a transimpedance amplifier and a feedback capacitor. The transimpedance amplifier amplifies the weak current signal output by the phototube so that it has sufficient amplitude for subsequent circuit processing. The resistor RF provides gain in the feedback network. In the feedback circuit, the resistor is responsible for controlling the degree of signal amplification. By adjusting the resistance value of the resistor, the gain of the signal can be controlled. The role of the feedback capacitor CF is to avoid oscillation problems by compensating for the internal junction capacitance of the phototube. The feedback capacitor CF is placed in the feedback network to create a zero point to offset the pole caused by the internal junction capacitance, stabilize the circuit and prevent oscillation. By using the feedback capacitor CF in the feedback network, the position of the pole and zero is adjusted to achieve the desired frequency response and stability.
[0045] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.
Claims
1. A high-speed OMR dot-printing device based on a photoelectric tube, characterized in that: It includes a support module and a coating point collection module installed inside the support module; the coating point collection module includes a photoelectric tube array, an analog-to-digital conversion board and a data interface board, the signal input end of the analog-to-digital conversion board is provided with a signal conditioning circuit, the photoelectric tube array is connected to the analog-to-digital conversion board through the signal conditioning circuit, and the signal output end of the analog-to-digital conversion board is connected to the data interface board; The support module includes a support frame, a transverse support rod is installed on the upper end of the support frame, the transverse support rod provides a mounting point for the photoelectric tube array, an insertion slot is provided in the upper side panel of the support frame, and the analog-to-digital conversion board and the data interface board are embedded in the insertion slot.
2. A high-speed OMR dot-smearing device based on a photoelectric tube according to claim 1, characterized in that: The data interface board comprises a buffer, a programmable logic controller and a PCI controller. The programmable logic controller is respectively connected to the control ends of the buffer and the PCI controller, and the signal output end of the buffer is connected to the PCI controller.
3. A high-speed OMR dot-smearing device based on a photoelectric tube according to claim 1, characterized in that: A line tube is provided at the bottom of the insertion slot, and the line tube passes through the upper panel of the support frame. The data line of the photoelectric tube array is connected to the connection analog-to-digital conversion board inside the insertion slot through the line tube.
4. A high-speed OMR dot-smearing device based on a photoelectric tube according to claim 3, characterized in that: The analog-to-digital conversion board includes an analog-to-digital converter, a single-chip microcomputer and a programmable gate array chip. The signal output end of the analog-to-digital converter is connected to the programmable gate array chip, and the signal output end of the single-chip microcomputer is connected to the configuration register in the analog-to-digital converter.
5. A high-speed OMR dot-smearing and recording device based on a photoelectric tube according to claim 4, characterized in that: The signal conditioning circuit includes a transimpedance amplifier and a feedback capacitor. The signal output end of the photoelectric tube array is connected to the transimpedance amplifier, one end of the feedback capacitor is connected to the inverting input end of the transimpedance amplifier, and the other end of the feedback capacitor is connected to the output end of the transimpedance amplifier. The output end of the transimpedance amplifier is connected to the input end of the analog-to-digital converter.
6. A high-speed OMR dot-smearing device based on a photoelectric tube according to claim 4, characterized in that: The transverse support rod provides a mounting point for the photoelectric tube array, including a groove on the surface of the transverse support rod, a roller is installed on the upper end of the housing of the photoelectric tube array, and the roller is embedded in the groove.
7. A high-speed OMR dot-smearing and recording device based on a photoelectric tube according to claim 2, characterized in that: The PCI controller has a built-in PCI interface, and the PCI controller is connected to a PC mainboard via the PCI interface.
8. A high-speed OMR dot-smearing and recording device based on a photoelectric tube according to claim 7, characterized in that: A driving device is arranged at the back of the panel of the supporting frame, and a controller of the driving device is connected to a PC mainboard via a PCI controller.
9. A high-speed OMR dot-smearing device based on a photoelectric tube according to claim 8, characterized in that: A vertical support rod is arranged inside the support frame, one end of the vertical support rod is connected to the bottom of the support frame through a fixing bolt, and the other end of the vertical support rod is connected to the middle part of the transverse support rod.
10. A high-speed OMR dot-smearing and recording device based on a photoelectric tube according to claim 9, characterized in that: A paper support is installed on the surface of the vertical support rod, the center point of the paper support corresponds to the scanning port of the photoelectric tube array, a conveying chain is provided on the side of the paper support close to the supporting frame panel, and the paper support is connected to the driving device through the conveying chain.