Light spot identification circuit and light spot identification module

Abstract

The utility model relates to the technical field of light spot identification, in particular to a light spot identification circuit and a light spot identification module. In a light spot identification circuit suitable for light guide arm light spot identification, a first analog-to-digital sampling end, a second analog-to-digital sampling end, a third analog-to-digital sampling end and a fourth analog-to-digital sampling end of a single-chip microcomputer are electrically connected with light receiving tube collectors of a first reflective optocoupler, a second reflective optocoupler, a third reflective optocoupler and a fourth reflective optocoupler respectively; the single-bus serial communication output end is used as the data output end of the light spot identification circuit; the first reflection type optical coupler, the second reflection type optical coupler, the third reflection type optical coupler and the fourth reflection type optical coupler carry out light spot identification by adopting a middle and rear section characteristic curve with the detection distance of 0.5-2mm, so that the detection distance is effectively increased based on the middle and rear section characteristic curve of the optical couplers and an analog-digital sampling detection mode, the processing precision requirement and the production cost are reduced, and the detection efficiency is improved. And the production efficiency and the accuracy of light spot identification are improved.

Description

Technical Field

[0001] This utility model relates to the field of light spot recognition technology, and in particular to a light spot recognition circuit and a light spot recognition module. Background Technology

[0002] Spot recognition is widely used in Q-switched laser therapy devices, such as the adjustable spot treatment head in the seven-joint light guide arm of a Q-switched laser therapy device series. However, existing adjustable spot treatment heads generally use the front-end characteristic curve of a reflective optocoupler for spot recognition. While the front-end characteristic curve has high sensitivity, the detection distance is too short (0.5mm for high level, <0.2mm for low level), requiring high processing precision, which is not conducive to production and cost control. Furthermore, when using the front-end characteristic curve of a reflective optocoupler for spot recognition, the CPU detects the high and low level changes of the collector of the reflective optocoupler's photodiode for spot recognition. Differences in components or manufacturing errors in structural parts can lead to incorrect spot recognition. In addition, the short detection distance also makes assembly and debugging difficult, and the yield rate is affected by differences in component performance or manufacturing errors in structural parts. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides a light spot recognition circuit and a light spot recognition module.

[0004] This utility model provides a light spot recognition circuit suitable for light guide arm light spot recognition, including a microcontroller, a first reflective optocoupler, a second reflective optocoupler, a third reflective optocoupler, a fourth reflective optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor.

[0005] The first analog-to-digital sampling terminal of the microcontroller is electrically connected to the collector of the light-receiving tube of the first reflective optocoupler and the first terminal of the first resistor, respectively. Its second analog-to-digital sampling terminal is electrically connected to the collector of the light-receiving tube of the second reflective optocoupler and the first terminal of the third resistor, respectively. Its third analog-to-digital sampling terminal is electrically connected to the collector of the light-receiving tube of the third reflective optocoupler and the first terminal of the fifth resistor, respectively. Its fourth analog-to-digital sampling terminal is electrically connected to the collector of the light-receiving tube of the fourth reflective optocoupler and the first terminal of the seventh resistor, respectively. Its single-bus serial communication output terminal is electrically connected to the first terminal of the ninth resistor as the data output terminal of the spot recognition circuit.

[0006] The light-receiving tube emitters of the first, second, third, and fourth reflective optocouplers are electrically connected to the negative terminals of their respective light-emitting tubes and grounded, and the positive terminals of their light-emitting tubes are electrically connected to the first terminals of the second, fourth, sixth, and eighth resistors, respectively.

[0007] The second terminals of the first resistor, the third resistor, the fifth resistor, and the seventh resistor are electrically connected to the second, fourth, sixth, and eighth resistors, respectively, and are connected to the operating voltage.

[0008] The second terminal of the ninth resistor is connected to the operating voltage;

[0009] The first reflective optocoupler, the second reflective optocoupler, the third reflective optocoupler, and the fourth reflective optocoupler use a mid-to-late stage characteristic curve with a detection distance of 0.5-2mm for spot recognition.

[0010] In one possible implementation, it also includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor;

[0011] The first capacitor, the second capacitor, the third capacitor, and the fourth capacitor are respectively connected in parallel to the two ends of the light-receiving tubes of the first reflective optocoupler, the second reflective optocoupler, the third reflective optocoupler, and the fourth reflective optocoupler;

[0012] The first terminal of the fifth capacitor is electrically connected to the data output terminal, and its second terminal is electrically connected to ground.

[0013] The first terminal of the sixth capacitor is electrically connected to the second terminal of the ninth resistor, and the second terminal is electrically grounded.

[0014] In one possible implementation, the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, and the sixth capacitor are all surface-mount capacitors.

[0015] One possible implementation also includes a power interface;

[0016] The positive terminal of the power interface provides the operating voltage, the negative terminal provides the ground terminal, and the data terminal is electrically connected to the data output terminal.

[0017] One possible implementation also includes a debugging interface;

[0018] The first data terminal, second data terminal, third data terminal, and fourth data terminal of the debugging interface are electrically connected to the first analog-to-digital sampling terminal, second analog-to-digital sampling terminal, third analog-to-digital sampling terminal, and fourth analog-to-digital sampling terminal of the microcontroller, respectively. Its voltage terminal is connected to the working voltage, and its ground terminal is connected to the ground.

[0019] In one possible implementation, the first reflective optocoupler, the second reflective optocoupler, the third reflective optocoupler, and the fourth reflective optocoupler are all KU163C reflective surface mount optocouplers.

[0020] In one possible implementation, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, and the ninth resistor are all surface mount resistors.

[0021] This utility model also provides a spot recognition module, including a PCB board and the spot recognition circuit described above;

[0022] The light spot recognition circuit is mounted on the PCB board.

[0023] The technical solution provided by this utility model has at least the following beneficial effects:

[0024] By electrically connecting the first, second, third, and fourth analog-to-digital sampling terminals of the microcontroller to the collectors of the light-receiving tubes of the first, second, third, and fourth reflective optocouplers, respectively, and limiting the first, second, third, and fourth reflective optocouplers to use mid-to-late stage characteristic curves with a detection distance of 0.5-2mm for spot recognition, based on the mid-to-late stage characteristic curves of the optocouplers and the analog-to-digital sampling detection method, the detection distance is effectively increased, the processing accuracy requirements and production costs are reduced, and the production efficiency and the accuracy of spot recognition are improved. Attached Figure Description

[0025] Figure 1 A circuit diagram of a light spot recognition circuit provided in an embodiment of this utility model;

[0026] Figure 2 This is a schematic diagram illustrating an application scenario of a light spot recognition circuit provided in an embodiment of the present invention. Detailed Implementation

[0027] To enhance understanding of this utility model, it will be described in further detail below with reference to the accompanying drawings and embodiments. These embodiments are only used to explain this utility model and do not limit the scope of protection of this utility model.

[0028] Please refer to Figure 1 and Figure 2 This utility model provides a light spot recognition circuit suitable for light guide arm light spot recognition, including a microcontroller U0, a first reflective optocoupler U1, a second reflective optocoupler U2, a third reflective optocoupler U3, a fourth reflective optocoupler U4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9.

[0029] The first analog-to-digital sampling terminal S1 of the microcontroller U0 is electrically connected to the collector of the light-receiving tube of the first reflective optocoupler U1 and the first terminal of the first resistor R1, respectively. Its second analog-to-digital sampling terminal S2 is electrically connected to the collector of the light-receiving tube of the second reflective optocoupler U2 and the first terminal of the third resistor R3, respectively. Its third analog-to-digital sampling terminal S3 is electrically connected to the collector of the light-receiving tube of the third reflective optocoupler U3 and the first terminal of the fifth resistor R5, respectively. Its fourth analog-to-digital sampling terminal S4 is electrically connected to the collector of the light-receiving tube of the fourth reflective optocoupler U4 and the first terminal of the seventh resistor R7, respectively. Its single-bus serial communication output terminal P is electrically connected to the first terminal of the ninth resistor R9 as the data output terminal of the spot recognition circuit.

[0030] The light-receiving tube emitters of the first reflective optocoupler U1, the second reflective optocoupler U2, the third reflective optocoupler U3, and the fourth reflective optocoupler U4 are electrically connected to the negative terminals of their respective light-emitting tubes and grounded, and the positive terminals of their light-emitting tubes are electrically connected to the first terminals of the second resistor R2, the fourth resistor R4, the sixth resistor R6, and the eighth resistor R8, respectively.

[0031] The second terminals of the first resistor R1, the third resistor R3, the fifth resistor R5, and the seventh resistor R7 are electrically connected to the second terminals of the second resistor R2, the fourth resistor R4, the sixth resistor R6, and the eighth resistor R8, respectively, and are connected to the working voltage VCC.

[0032] The second terminal of the ninth resistor R9 is connected to the working voltage VCC;

[0033] Among them, the first reflective optocoupler U1, the second reflective optocoupler U2, the third reflective optocoupler U3, and the fourth reflective optocoupler U4 use the mid-to-late segment characteristic curve with a detection distance d of 0.5-2mm for spot recognition.

[0034] In this embodiment, the microcontroller U0 is a conventional model used for signal detection and single-bus serial communication. The first reflective optocoupler U1, the second reflective optocoupler U2, the third reflective optocoupler U3, and the fourth reflective optocoupler U4 can be conventional reflective optocouplers used for spot recognition. The first resistor R1, the third resistor R3, the fifth resistor R5, the seventh resistor R7, and the ninth resistor R9 serve as pull-up resistors, while the second resistor R2, the fourth resistor R4, the sixth resistor R6, and the eighth resistor R8 serve as current-limiting resistors. In a specific implementation, the microcontroller U0 can be an STC8G1K08A-DFN8 model. The first reflective optocoupler U1, the second reflective optocoupler U2, the third reflective optocoupler U3, and the fourth reflective optocoupler U4 can be KU163C reflective surface-mount optocouplers. The first resistor R1, the third resistor R3, the fifth resistor R5, the seventh resistor R7, and the ninth resistor R9 can be surface-mount resistors of the same model, such as resistors with a resistance of 5.1KΩ and a tolerance of 1%. The second resistor R2, the fourth resistor R4, the sixth resistor R6, and the eighth resistor R8 can be surface-mount resistors of the same specification, such as 510Ω resistors with a tolerance of 1%. The operating voltage VCC is 5V. Figure 2 During spot recognition, the first reflective optocoupler U1, the second reflective optocoupler U2, the third reflective optocoupler U3, and the fourth reflective optocoupler U4 contact the spot recognition position of the adjustable spot treatment head of the light guide arm. When the light guide arm treatment head adjusts the spot, the spot recognition position (spot recognition area) rotates, and the detection distance d of the corresponding four reflective patch optocouplers changes, thus changing the collector voltage of the light receiving tube of the four reflective patch optocouplers. Different spot diameters correspond to different detection distances d for the four reflective patch optocouplers. Without a slot (i.e., the optocoupler is not facing the slot opening), the distance between the optocoupler and the reflective surface is approximately 0.5mm, i.e., d1 = 0.5mm. With a slot (i.e., the optocoupler is facing the slot opening), the distance between the optocoupler and the reflective surface is approximately 2mm, i.e., d2 = 2mm. When the spot recognition position (spot recognition area) rotates, the slots corresponding to the four reflective patch optocouplers will move away from or closer to the corresponding optocouplers. The microcontroller U0 performs 8-bit AD sampling on the collectors of the four reflective patch optocouplers, with an AD value range of 0-255. Without slots, the optocoupler is approximately 0.5mm from the reflective surface, resulting in higher conduction (AD value < 100, indicating a low level). With slots, the optocoupler is approximately 2mm from the reflective surface, resulting in lower conduction (AD value > 100, indicating a high level). The high and low levels corresponding to the four reflective patch optocouplers are converted into pulse signals and transmitted serially via a single bus. For example, when the light spot of the adjustable spot treatment head of the light guide arm is adjusted to 2mm, such as... Figure 2The fourth reflective optocoupler U4 has a slot at the position corresponding to the spot recognition area. The first reflective optocoupler U1, the second reflective optocoupler U2, and the third reflective optocoupler U3 do not have slots at the positions corresponding to the spot recognition area. The first three optocouplers are about 0.5mm away from the reflective surface, and the optocoupler conduction is relatively large. When the AD value is <100, it is a low level. The fourth optocoupler is about 2mm away from the reflective surface, and the optocoupler conduction is relatively small. When the AD value is >100, it is a high level. The corresponding 4-bit binary code for the spot value to be sent is 0001. The single-bus serial transmission pulse train sending process is as follows: Sending start: high level 1ms, low level 9ms; Send 1 bit: high level 1ms, low level 1ms; Send 2 bits: high level 1ms, low level 1ms; Send 3 bits: high level 1ms, low level 1ms; Send 4 bits: high level 1ms, low level 2ms; Sending end: high level 1ms, low level; After accumulating 50ms from the start of sending, the transmission is repeated.

[0035] In one possible implementation, it also includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6.

[0036] The first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4 are respectively connected in parallel to the two ends of the light-receiving tubes of the first reflective optocoupler U1, the second reflective optocoupler U2, the third reflective optocoupler U3, and the fourth reflective optocoupler U4;

[0037] The first terminal of the fifth capacitor C5 is electrically connected to the data output terminal, and its second terminal is electrically connected to ground.

[0038] The first terminal of the sixth capacitor C6 is electrically connected to the second terminal of the ninth resistor R9, and the second terminal is electrically grounded.

[0039] In this embodiment, capacitors C1, C2, C3, C4, C5, and C6 are used for signal filtering and can all be conventional capacitors. In practice, capacitors C1, C2, C3, C4, and C5 can be capacitors of the same specifications, such as conventional capacitors with a capacitance of 100pF, a tolerance of 5%, and a voltage rating of 50V. Capacitor C6 can be a conventional capacitor with a capacitance of 1uF, a tolerance of 10%, and a voltage rating of 50V.

[0040] In one possible implementation, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 are all surface-mount capacitors.

[0041] In this embodiment, when the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 are all surface-mount capacitors, the space occupied by the components can be effectively reduced, which facilitates the miniaturization design of the product.

[0042] One possible implementation also includes a power interface J1;

[0043] The positive terminal of the power interface J1 provides the operating voltage VCC, the negative terminal provides the ground terminal GND, and the data terminal is electrically connected to the data output terminal.

[0044] In this embodiment, the power interface J1 includes power input and single-bus serial communication output functions. Pin 1 is used as the positive power supply, pin 2 is used for serial communication, and pin 3 is used as the negative power supply. The operating voltage VCC is 5V.

[0045] One possible implementation also includes the debugging interface J2;

[0046] The first data terminal, second data terminal, third data terminal, and fourth data terminal of the debugging interface J2 are electrically connected to the first analog-to-digital sampling terminal S1, the second analog-to-digital sampling terminal S2, the third analog-to-digital sampling terminal S3, and the fourth analog-to-digital sampling terminal S4 of the microcontroller U0, respectively. Its voltage terminal is connected to the working voltage VCC, and its ground terminal is grounded.

[0047] In this embodiment, the debugging interface J2 is used for firmware download and debugging, and adopts a conventional design. Pin 1 is the positive power supply, pin 2 is the negative power supply, pin 3 is the first data terminal, pin 4 is the second data terminal, pin 5 is the third data terminal, and pin 6 is the fourth data terminal.

[0048] In one possible implementation, the first reflective optocoupler U1, the second reflective optocoupler U2, the third reflective optocoupler U3, and the fourth reflective optocoupler U4 are all KU163C reflective patch optocouplers.

[0049] In one possible implementation, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 are all surface mount resistors.

[0050] In this embodiment, when the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 are all surface mount resistors, the space occupied by the components can be effectively reduced, which facilitates the miniaturization design of the product.

[0051] This utility model also provides a spot recognition module, including a PCB board and the spot recognition circuit described above;

[0052] The light spot recognition circuit is mounted on the PCB board.

[0053] The above embodiments should not limit the present invention in any way. All technical solutions obtained by equivalent substitution or equivalent conversion fall within the protection scope of the present invention.

Claims

1. A light spot recognition circuit, suitable for light spot recognition in a light guide arm, characterized in that, It includes a microcontroller, a first reflective optocoupler, a second reflective optocoupler, a third reflective optocoupler, a fourth reflective optocoupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor; The first analog-to-digital sampling terminal of the microcontroller is electrically connected to the collector of the light-receiving tube of the first reflective optocoupler and the first terminal of the first resistor, respectively. Its second analog-to-digital sampling terminal is electrically connected to the collector of the light-receiving tube of the second reflective optocoupler and the first terminal of the third resistor, respectively. Its third analog-to-digital sampling terminal is electrically connected to the collector of the light-receiving tube of the third reflective optocoupler and the first terminal of the fifth resistor, respectively. Its fourth analog-to-digital sampling terminal is electrically connected to the collector of the light-receiving tube of the fourth reflective optocoupler and the first terminal of the seventh resistor, respectively. Its single-bus serial communication output terminal is electrically connected to the first terminal of the ninth resistor as the data output terminal of the spot recognition circuit. The light-receiving tube emitters of the first, second, third, and fourth reflective optocouplers are electrically connected to the negative terminals of their respective light-emitting tubes and grounded, and the positive terminals of their light-emitting tubes are electrically connected to the first terminals of the second, fourth, sixth, and eighth resistors, respectively. The second terminals of the first resistor, the third resistor, the fifth resistor, and the seventh resistor are electrically connected to the second, fourth, sixth, and eighth resistors, respectively, and are connected to the operating voltage. The second terminal of the ninth resistor is connected to the operating voltage; The first reflective optocoupler, the second reflective optocoupler, the third reflective optocoupler, and the fourth reflective optocoupler use a mid-to-late stage characteristic curve with a detection distance of 0.5-2mm for spot recognition.

2. The spot recognition circuit according to claim 1, characterized in that, It also includes a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, and a sixth capacitor; The first capacitor, the second capacitor, the third capacitor, and the fourth capacitor are respectively connected in parallel to the two ends of the light-receiving tubes of the first reflective optocoupler, the second reflective optocoupler, the third reflective optocoupler, and the fourth reflective optocoupler; The first terminal of the fifth capacitor is electrically connected to the data output terminal, and its second terminal is electrically connected to ground. The first terminal of the sixth capacitor is electrically connected to the second terminal of the ninth resistor, and the second terminal is electrically grounded.

3. The spot recognition circuit according to claim 2, characterized in that, The first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, and the sixth capacitor are all surface-mount capacitors.

4. The spot recognition circuit according to claim 1, characterized in that, It also includes a power interface; The positive terminal of the power interface provides the operating voltage, the negative terminal provides the ground terminal, and the data terminal is electrically connected to the data output terminal.

5. The light spot recognition circuit according to claim 1, characterized in that, It also includes a debugging interface; The first data terminal, second data terminal, third data terminal, and fourth data terminal of the debugging interface are electrically connected to the first analog-to-digital sampling terminal, second analog-to-digital sampling terminal, third analog-to-digital sampling terminal, and fourth analog-to-digital sampling terminal of the microcontroller, respectively. Its voltage terminal is connected to the working voltage, and its ground terminal is connected to the ground.

6. The spot recognition circuit according to claim 1, characterized in that, The first reflective optocoupler, the second reflective optocoupler, the third reflective optocoupler, and the fourth reflective optocoupler are all KU163C reflective surface mount optocouplers.

7. The spot recognition circuit according to claim 1, characterized in that, The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth resistors are all surface mount resistors.

8. A light spot recognition module, characterized in that, Includes a PCB board and a spot recognition circuit as described in any one of claims 1 to 7; The light spot recognition circuit is mounted on the PCB board.

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