Photoelectric sensor detection device

Abstract

The utility model relates to a photoelectric sensor detection device, which belongs to the technical field of test circuits and comprises a current box, a photoelectric sensor and a detection circuit. The shell is provided with a first ampere meter for displaying a driving current on a branch on which a light emitting tube in the photoelectric sensor is located and a second ampere meter for displaying a receiving current on a branch on which a light receiving tube in the photoelectric sensor is located; one end of the crimping tool is electrically connected with the current box, the other end of the crimping tool is electrically connected with the photoelectric sensor, and the crimping tool is used for enabling the first ampere meter to receive the driving current and the second ampere meter to receive the receiving current to complete detection. According to the utility model, the technical problem that low cost and high efficiency cannot be both considered when sensitivity detection is carried out on the photoelectric sensor of the printer in the prior art is solved.

Description

Technical Field

[0001] This utility model relates to the field of test circuit technology, and in particular to a photoelectric sensor detection device. Background Technology

[0002] Several key components of a label printer include the printhead, motor, MCU, and sensor. The photoelectric sensor itself is similar to a transistor, except the base is replaced with a photosensitive material. Based on the current amplification characteristics of a transistor, it amplifies the generated photocurrent. Here, there are two variables: the ability of the photosensitive material to generate current when excited, and the current amplification factor of the transistor. Multiplying these two coefficients results in a large error. Determining whether incoming materials are suitable for production requires inspecting them according to the actual design's compatibility range. Pre-assembly inspection can avoid repeated disassembly and sensor replacement, which reduces efficiency.

[0003] Existing technologies employ two main approaches. First, the sensor and the LED are placed separately on the same PCBA, structurally positioned for easy disassembly. After installation, the signal is tested, and different resistor levels are used to adapt to different sensors based on the actual signal strength. The drawbacks are cumbersome operation and low efficiency, making this approach primarily used in industrial printers and suitable for low-volume production. Second, a design approach circumvents this by using a reflective sensor and a single LED for positioning. The consistency of an LED is far superior to that of a receiver, allowing adjustment to the desired signal threshold via DAC or PWM. However, this requires two LED adjustment circuits, increasing costs. Utility Model Content

[0004] In view of this, it is necessary to provide a photoelectric sensor detection device to solve the technical problem that the existing technology cannot achieve both low cost and high efficiency when detecting the sensitivity of the photoelectric sensor of a printer.

[0005] To address the above problems, this utility model provides a photoelectric sensor detection device, comprising:

[0006] The current box has a first ammeter on its housing for displaying the driving current on the branch where the light-emitting tube is located in the photoelectric sensor, and a second ammeter for displaying the receiving current on the branch where the light-receiving tube is located in the photoelectric sensor.

[0007] The crimping fixture has one end electrically connected to the current box and the other end electrically connected to the photoelectric sensor, which is used to enable the first ammeter to receive the driving current and the second ammeter to receive the receiving current in order to complete the detection.

[0008] In one possible implementation, the housing of the current cell includes:

[0009] A 3.3V power supply module is electrically connected to the anode of the light-emitting diode and the collector of the light-receiving diode, and is used to supply power to the light-emitting diode and the light-receiving diode.

[0010] In one possible implementation, the 3.3V power supply module includes: a constant current source and an LDO;

[0011] One end of the LDO is electrically connected to an external power source, and the other end is electrically connected to the anode of the light-emitting diode, the collector of the light-receiving diode, and the constant current source, respectively.

[0012] In one possible implementation, the housing of the current box further includes: a first ammeter interface and a second ammeter interface;

[0013] The first ammeter interface is electrically connected to the constant current source and the first ammeter, respectively.

[0014] The second ammeter interface is electrically connected to the constant current source and the second ammeter, respectively;

[0015] The 3.3V power supply module, the first ammeter interface, and the second ammeter interface are all integrated on the driver board.

[0016] In one possible implementation, the housing of the current cell includes:

[0017] USB power interface, electrically connected to an external power source;

[0018] One end of the LDO is electrically connected to an external power source via the USB power interface, and the other end is electrically connected to a constant current source, which is used to convert the external power source into a 3.3V voltage to power the current box and photoelectric sensor through the constant current source.

[0019] In one possible implementation, the housing of the current cell includes:

[0020] A potentiometer, electrically connected to the constant current source, is used to adjust the output of the constant current source.

[0021] In one possible implementation, the constant current source further includes:

[0022] Low-side constant current source control circuit and constant current source leakage circuit;

[0023] The low-side constant current source control circuit is electrically connected to the LDO, the potentiometer, and the constant current source bleed circuit, respectively, and is used to receive the 3.3V power supply after conversion by the LDO and to receive the control signal from the potentiometer to adjust the output of the constant current source;

[0024] The constant current source leakage circuit is also electrically connected to the cathode of the light-emitting diode and the interface of the first ammeter, respectively, for transmitting drive current to the first ammeter.

[0025] In one possible implementation, the low-side constant current source control circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor;

[0026] One end of the first resistor is electrically connected to the other end of the LDO, and the other end of the first resistor is electrically connected to one end of the second resistor;

[0027] The other end of the second resistor is electrically connected to one end of the third resistor;

[0028] The other end of the third resistor is electrically connected to the grounding point and the constant current source leakage circuit, respectively.

[0029] One end of the fourth resistor is electrically connected to the other end of the second resistor, and the other end of the fourth resistor is grounded.

[0030] One end of the first capacitor is electrically connected to one end of the third resistor, and the other end is grounded;

[0031] The constant current source leakage circuit includes: an operational amplifier, an NPN transistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor, a third capacitor, and a fourth capacitor;

[0032] The operational amplifier has its inverting input terminal electrically connected to the other end of the third resistor, its non-inverting input terminal electrically connected to one end of the fifth resistor, its positive power supply terminal electrically connected to the other end of the LDO, its negative power supply terminal grounded, and its output terminal electrically connected to the base of the NPN transistor through the sixth resistor.

[0033] The collector of the NPN transistor is electrically connected to the cathode of the light-emitting diode through the seventh resistor, and the emitter is electrically connected to the interface of the first ammeter through the eighth resistor.

[0034] The other end of the fifth resistor is electrically connected to the emitter of the NPN transistor;

[0035] One end of the second capacitor is electrically connected to the other end of the third resistor, and the other end of the second capacitor is electrically connected to the output terminal of the operational amplifier;

[0036] One end of each of the third and fourth capacitors is electrically connected to the other end of the LDO, and the other ends are grounded together.

[0037] In one possible implementation, the potentiometer is connected in parallel with a second resistor in the constant current source.

[0038] In one possible implementation, the housing of the current cell further includes:

[0039] The first connector has one end electrically connected to the LDO and the other end electrically connected to the anode of the light-emitting diode and the collector of the light-receiving diode through a crimping fixture, for supplying power to the light-emitting diode and the light-receiving diode.

[0040] The second connector has one end electrically connected to the emitter of the receiving tube via a crimping tool, and the other end electrically connected to the interface of the second ammeter, for transmitting the receiving current of the branch where the receiving tube is located to the second ammeter.

[0041] The third connector has one end connected to the cathode of the light-emitting diode via a crimping fixture and a constant current source, and the other end connected to the interface of the first ammeter, for transmitting the driving current of the branch where the light-emitting diode is located to the first ammeter.

[0042] One end of the third connector is electrically connected to the collector of the NPN transistor through the seventh resistor.

[0043] The beneficial effects of this utility model are as follows: The photoelectric sensor detection device provided by this utility model includes a current box and a crimping fixture. The housing of the current box is provided with a first ammeter for displaying the driving current of the light-emitting diode in the photoelectric sensor and a second ammeter for displaying the receiving current of the light-receiving diode in the photoelectric sensor. The current box and the photoelectric sensor are connected by the crimping fixture to monitor the current status of the light-emitting diode and the light-receiving diode on the photoelectric sensor in real time and complete the detection. The device has a simple structure, which reduces the cost and improves the detection efficiency. It effectively solves the technical problem that the prior art cannot balance low cost and high efficiency when performing sensitivity detection on the photoelectric sensor of a printer. Attached Figure Description

[0044] Figure 1 A schematic diagram of the structure of an embodiment of the photoelectric sensor detection device provided by this utility model;

[0045] Figure 2 A schematic diagram of the low-side constant current source control circuit and the constant current source leakage circuit provided by this utility model. Detailed Implementation

[0046] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0048] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0049] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0050] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] like Figure 1 As shown, a specific embodiment of this utility model discloses a photoelectric sensor detection device 10, comprising:

[0052] The current box 110 and the housing 1101 are provided with a first ammeter 11011 for displaying the driving current on the branch where the light-emitting tube 210 in the photoelectric sensor 20 is located, and a second ammeter 11012 for displaying the receiving current on the branch where the light-receiving tube 220 in the photoelectric sensor 20 is located.

[0053] Specifically, to make the test results more identifiable, the first ammeter can be a milliampere ammeter, and the second ammeter can be a microampere ammeter.

[0054] The crimping fixture 120 is electrically connected at one end to the current box 110 and at the other end to the photoelectric sensor 20. It is used to enable the first ammeter to receive the driving current and the second ammeter to receive the receiving current in order to complete the detection.

[0055] Compared with the prior art, the photoelectric sensor detection device provided by this utility model includes a current box and a crimping fixture. The housing of the current box is provided with a first ammeter for displaying the driving current of the light-emitting diode in the photoelectric sensor and a second ammeter for displaying the receiving current of the light-receiving diode in the photoelectric sensor. The current box and the photoelectric sensor are connected by the crimping fixture to monitor the current status of the light-emitting diode and the light-receiving diode in the photoelectric sensor in real time and complete the detection. The device has a simple structure, which reduces the cost and improves the detection efficiency. It effectively solves the technical problem that the prior art cannot achieve both low cost and high efficiency when performing sensitivity detection on the photoelectric sensor of a printer.

[0056] In one possible implementation, the housing 1101 of the current box 110 includes:

[0057] The 3.3V power supply module 1103 is electrically connected to the anode of the light-emitting diode 210 and the collector of the light-receiving diode 220, and is used to supply power to the light-emitting diode 210 and the light-receiving diode 220.

[0058] In one possible implementation, the 3.3V power supply module 1103 includes: a constant current source 1105 and an LDO 1105;

[0059] One end of the LDO1105 is electrically connected to the external power supply 30, and the other end is electrically connected to the anode of the light-emitting diode 210, the collector of the light-receiving diode 220, and the constant current source 1104.

[0060] In one possible implementation, the housing 1101 of the current box 110 further includes: a first ammeter interface 1106 and a second ammeter interface 1107.

[0061] The first ammeter interface 1106 is electrically connected to the constant current source 1104 and the first ammeter 11011 respectively;

[0062] The second ammeter interface 1107 is electrically connected to the constant current source 1104 and the second ammeter 11012 respectively.

[0063] The 3.3V power supply module 1105, the first ammeter interface 1106, and the second ammeter interface 1107 are all integrated on the driver board.

[0064] In one possible implementation, the housing 1101 of the current box 110 includes:

[0065] USB power interface 11013 is electrically connected to external power supply 30;

[0066] One end of the LDO1105 is electrically connected to an external power source 30 via a USB power interface 11013, and the other end is electrically connected to a constant current source 1104, used to convert the external power supply into a 3.3V voltage to power the current box and photoelectric sensor.

[0067] It should be noted that after the external power input is regulated by an LDO, it produces 3.3V. This 3.3V can power both the external circuitry and the operational amplifiers on the board. The driver section uses a common operational amplifier and transistor-based low-side constant current source. When connected to the first ammeter, the real-time current is displayed. Similarly, the receiving tube's negative terminal is connected to the second ammeter and grounded, which also displays the induced current in real time.

[0068] In one possible implementation, the housing 1101 of the current box 110 includes:

[0069] Potentiometer 11014 is electrically connected to constant current source 1104 and is used to adjust the output of constant current source.

[0070] In one possible implementation, the constant current source 1104 also includes:

[0071] Low-side constant current source control circuit 11041 and constant current source leakage circuit 11042;

[0072] The low-side constant current source control circuit 11041 is electrically connected to LDO 1105, potentiometer 11014 and constant current source bleeder circuit 11042 respectively, and is used to receive the 3.3V power supply after conversion by LDO and receive the control signal of potentiometer to adjust the output of constant current source;

[0073] The constant current source leakage circuit 11042 is also electrically connected to the cathode of the light-emitting diode 210 and the first ammeter interface 1106, respectively, for transmitting drive current to the first ammeter 11011.

[0074] like Figure 2 In one possible implementation, the low-side constant current source control circuit 11041 includes: a first resistor R14, a second resistor R15, a third resistor R16, a fourth resistor R18, and a first capacitor C10.

[0075] One end of the first resistor R14 is electrically connected to the other end of the LDO1105, and the other end of the first resistor R14 is electrically connected to one end of the second resistor R15.

[0076] The other end of the second resistor R15 is electrically connected to one end of the third resistor R16.

[0077] The other end of the third resistor R16 is electrically connected to the ground point and the constant current source leakage circuit 11042, respectively.

[0078] One end of the fourth resistor R18 is electrically connected to the other end of the second resistor R15, and the other end of the fourth resistor R18 is grounded.

[0079] One end of the first capacitor C10 is electrically connected to one end of the third resistor R16, and the other end is grounded;

[0080] The constant current source leakage circuit 11042 includes: operational amplifier U1B, NPN transistor Q2, fifth resistor R13, sixth resistor R17, seventh resistor R19, eighth resistor R20, second capacitor C7, third capacitor C8 and fourth capacitor C9.

[0081] Among them, the inverting input terminal of the operational amplifier U1B is electrically connected to the other end of the third resistor R16, the non-inverting input terminal is electrically connected to one end of the seventh resistor R19, the positive power supply terminal is electrically connected to the other end of the LDO1105, the negative power supply terminal is grounded, and the output terminal is electrically connected to the base of the NPN transistor Q2 through the sixth resistor R17.

[0082] The collector of the NPN transistor Q2 is electrically connected to the cathode of the LED 210 through the fifth resistor R13, and the emitter is electrically connected to the first ammeter interface 1106 through the eighth resistor R20.

[0083] The other end of the seventh resistor R19 is electrically connected to the emitter of the NPN transistor;

[0084] One end of the second capacitor C7 is electrically connected to the other end of the third resistor R16, and the other end of the second capacitor C7 is electrically connected to the output terminal of the operational amplifier U1B.

[0085] One end of the third capacitor C8 and the fourth capacitor C9 are both electrically connected to the other end of the LDO1105, and the other ends are grounded together.

[0086] In one possible implementation, potentiometer 11014 is connected in parallel with the second resistor R15 in constant current source 1104.

[0087] In one possible implementation, the housing 1101 of the current box 110 also includes:

[0088] The first connector 11015 is electrically connected at one end to LDO1105 and at the other end to the anode of the light-emitting diode 210 and the collector of the light-receiving diode 220 via the crimping fixture 120, and is used to supply power to the light-emitting diode 210 and the light-receiving diode 220.

[0089] The second connector 11016 has one end electrically connected to the emitter of the light receiver 210 via the crimping fixture 120, and the other end electrically connected to the second ammeter interface 1107, for transmitting the receiving current of the branch where the light receiver 220 is located to the second ammeter 11012.

[0090] The third connector 11017 has one end connected to the cathode of the light-emitting diode 210 via the crimping fixture 120 and the constant current source 1104 in sequence, and the other end connected to the first ammeter interface 1106. It is used to transmit the driving current of the branch where the light-emitting diode 210 is located to the first ammeter 11011.

[0091] One end of the third connector 11017 is electrically connected to the collector of the NPN transistor Q2 through the seventh resistor R19.

[0092] Preferably, the first connector, the second connector, and the third connector can all be banana-shaped connectors.

[0093] Furthermore, the crimping fixture can be flexibly adjusted according to the interfaces of each project. One end of the adapter board connects to the PCBA or FPCCA under test, and the other end connects to the three banana plugs coming from the outside. Then, based on the actual designed reflection distance, the actual assembly environment is carved out with bakelite, and labels are placed at the reflection positions to simulate the actual use environment.

[0094] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A photoelectric sensor detection device, applied to a printer, characterized in that, include: The current box has a first ammeter on its housing for displaying the driving current on the branch where the light-emitting tube is located in the photoelectric sensor, and a second ammeter for displaying the receiving current on the branch where the light-receiving tube is located in the photoelectric sensor. The crimping fixture has one end electrically connected to the current box and the other end electrically connected to the photoelectric sensor, which is used to enable the first ammeter to receive the driving current and the second ammeter to receive the receiving current in order to complete the detection.

2. The photoelectric sensor detection device according to claim 1, characterized in that, The housing of the current cell includes: A 3.3V power supply module is electrically connected to the anode of the light-emitting diode and the collector of the light-receiving diode, and is used to supply power to the light-emitting diode and the light-receiving diode.

3. The photoelectric sensor detection device according to claim 2, characterized in that, The 3.3V power supply module includes: a constant current source and an LDO; One end of the LDO is electrically connected to an external power source, and the other end is electrically connected to the anode of the light-emitting diode, the collector of the light-receiving diode, and the constant current source, respectively.

4. The photoelectric sensor detection device according to claim 3, characterized in that, The housing of the current box also includes: a first ammeter interface and a second ammeter interface; The first ammeter interface is electrically connected to the constant current source and the first ammeter, respectively. The second ammeter interface is electrically connected to the constant current source and the second ammeter, respectively; The 3.3V power supply module, the first ammeter interface, and the second ammeter interface are all integrated on the driver board.

5. The photoelectric sensor detection device according to claim 3, characterized in that, The housing of the current cell includes: USB power interface, electrically connected to an external power source; One end of the LDO is electrically connected to an external power source via the USB power interface, and the other end is electrically connected to a constant current source, which is used to convert the external power source into a 3.3V voltage to power the current box and photoelectric sensor through the constant current source.

6. The photoelectric sensor detection device according to claim 4, characterized in that, The housing of the current cell includes: A potentiometer, electrically connected to the constant current source, is used to adjust the output of the constant current source.

7. The photoelectric sensor detection device according to claim 6, characterized in that, The constant current source also includes: Low-side constant current source control circuit and constant current source leakage circuit; The low-side constant current source control circuit is electrically connected to the LDO, the potentiometer, and the constant current source bleed circuit, respectively, and is used to receive the 3.3V power supply after conversion by the LDO and to receive the control signal from the potentiometer to adjust the output of the constant current source; The constant current source leakage circuit is also electrically connected to the cathode of the light-emitting diode and the interface of the first ammeter, respectively, for transmitting drive current to the first ammeter.

8. The photoelectric sensor detection device according to claim 7, characterized in that, The low-side constant current source control circuit includes: a first resistor, a second resistor, a third resistor, a fourth resistor, and a first capacitor; One end of the first resistor is electrically connected to the other end of the LDO, and the other end of the first resistor is electrically connected to one end of the second resistor; The other end of the second resistor is electrically connected to one end of the third resistor; The other end of the third resistor is electrically connected to the grounding point and the constant current source leakage circuit, respectively. One end of the fourth resistor is electrically connected to the other end of the second resistor, and the other end of the fourth resistor is grounded. One end of the first capacitor is electrically connected to one end of the third resistor, and the other end is grounded; The constant current source leakage circuit includes: an operational amplifier, an NPN transistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a second capacitor, a third capacitor, and a fourth capacitor; The operational amplifier has its inverting input terminal electrically connected to the other end of the third resistor, its non-inverting input terminal electrically connected to one end of the fifth resistor, its positive power supply terminal electrically connected to the other end of the LDO, its negative power supply terminal grounded, and its output terminal electrically connected to the base of the NPN transistor through the sixth resistor. The collector of the NPN transistor is electrically connected to the cathode of the light-emitting diode through the seventh resistor, and the emitter is electrically connected to the interface of the first ammeter through the eighth resistor. The other end of the fifth resistor is electrically connected to the emitter of the NPN transistor; One end of the second capacitor is electrically connected to the other end of the third resistor, and the other end of the second capacitor is electrically connected to the output terminal of the operational amplifier; One end of each of the third and fourth capacitors is electrically connected to the other end of the LDO, and the other ends are grounded together.

9. The photoelectric sensor detection device according to claim 7, characterized in that, The potentiometer is connected in parallel with the second resistor in the constant current source.

10. The photoelectric sensor detection device according to claim 8, characterized in that, The housing of the current cell also includes: The first connector has one end electrically connected to the LDO and the other end electrically connected to the anode of the light-emitting diode and the collector of the light-receiving diode through a crimping fixture, for supplying power to the light-emitting diode and the light-receiving diode. The second connector has one end electrically connected to the emitter of the receiving tube via a crimping tool, and the other end electrically connected to the interface of the second ammeter, for transmitting the receiving current of the branch where the receiving tube is located to the second ammeter. The third connector has one end connected to the cathode of the light-emitting diode via a crimping fixture and a constant current source, and the other end connected to the interface of the first ammeter, for transmitting the driving current of the branch where the light-emitting diode is located to the first ammeter. One end of the third connector is electrically connected to the collector of the NPN transistor through the seventh resistor.

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