Hand-held laser range finder laser drive circuit and hand-held laser range finder

Abstract

The utility model relates to the technical field of measuring equipment, in particular to a laser driving circuit of a handheld laser range finder and the handheld laser range finder, and the laser driving circuit of the handheld laser range finder comprises a driving voltage stabilizing circuit used for providing stable working voltage for a laser transmitting circuit; the energy storage circuit is used for storing energy before laser emission, rapidly discharging when the circuit is switched on, and providing pulse type energy for the laser emission circuit; the laser emission circuit is used for receiving the trigger signal, controlling on-off of current and further controlling laser emission; the driving voltage stabilizing circuit comprises a fifth resistor, a second capacitor and a voltage stabilizing diode; the first end of the second capacitor is connected with the second end of the fifth resistor and the cathode of the voltage stabilizing diode, the second end of the second capacitor is grounded, the cathode of the voltage stabilizing diode is connected with the second end of the fifth resistor, and the anode of the voltage stabilizing diode is grounded. According to the circuit, the stability of the laser driving voltage is remarkably improved, and the cost can be reduced to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of measuring equipment, in particular to a laser driving circuit of a handheld laser rangefinder and a handheld laser rangefinder. Background Art

[0002] In the design and application of handheld laser rangefinders, the laser driving circuit plays a vital role, directly affecting the accuracy and stability of ranging. The traditional laser driving circuit design integrates the driving power supply, energy storage circuit, switching circuit, driving chip and necessary protection mechanism to provide the necessary excitation energy for the laser. However, this type of circuit system has some significant technical limitations.

[0003] First, the laser driving power supply in the prior art lacks an effective voltage stabilization mechanism, resulting in large voltage fluctuations during the power supply process. This instability will be directly transmitted to the laser, causing fluctuations in the output laser energy, thereby affecting the consistency and accuracy of the ranging results. Especially when the battery power is reduced or the external power supply fluctuates, the measurement error may increase significantly, limiting its application in high-precision measurement scenarios.

[0004] Secondly, in order to flexibly adjust the laser pulse width under different measurement requirements, existing solutions generally rely on the integration of pulse width modulation (PWM) chips. Although PWM modulation can achieve precise control of pulse width, it introduces additional costs and complexity. The design and implementation of the PWM chip itself and its peripheral circuits not only increase the bill of materials (BOM) cost of handheld devices, but also put forward higher requirements for the miniaturization and energy efficiency of the overall circuit, which is particularly unfavorable in the market environment that pursues portability and cost-effectiveness.

[0005] In view of the above problems, developing a new generation of handheld laser rangefinder laser driving circuit that can not only ensure the stability of laser driving voltage, but also simplify the pulse width adjustment mechanism and reduce costs has become an important direction of current technological development. Utility Model Content

[0006] 1. Technical issues to be resolved

[0007] In view of the above-mentioned shortcomings and deficiencies of the prior art, the utility model provides a handheld laser rangefinder laser driving circuit and a handheld laser rangefinder.

[0008] (II) Technical solution

[0009] In order to achieve the above-mentioned purpose, the main technical solutions adopted by the utility model include:

[0010] In a first aspect, an embodiment of the utility model provides a laser driving circuit for a handheld laser rangefinder, comprising:

[0011] A driving voltage stabilizing circuit for providing a stable operating voltage to a laser emission circuit;

[0012] Energy storage circuit used to store energy before laser emission. When the circuit is turned on, it discharges rapidly to provide pulsed energy for the laser emission circuit.

[0013] A laser emission circuit for receiving a trigger signal, controlling the on and off of the current and thus controlling the laser emission;

[0014] Wherein, the driving voltage stabilizing circuit includes a fifth resistor, a second capacitor and a voltage stabilizing diode;

[0015] The first end of the second capacitor is connected to the second end of the fifth resistor and the cathode of the Zener diode, the second end of the second capacitor is grounded, the cathode of the Zener diode is connected to the second end of the fifth resistor, and the anode of the Zener diode is grounded.

[0016] Optionally, the laser emission circuit includes a trigger signal receiving end, a first switch circuit, a second switch circuit, a third switch circuit, a tenth resistor and a laser tube;

[0017] Among them, the trigger signal receiving end, the first switch circuit, the second switch circuit, and the third switch circuit are connected in sequence, the second switch circuit is connected to the first end of the second capacitor; the first end of the tenth resistor is connected to the anode of the laser tube, the second end of the tenth resistor is connected to the energy storage circuit and grounded; the cathode of the laser tube is connected to the energy storage circuit.

[0018] Optionally, the first switch circuit includes a first resistor, a second resistor and a second MOS transistor;

[0019] Among them, the first end of the first resistor is connected to the trigger signal receiving end, and the second end of the first resistor is connected to the second resistor and the gate of the second MOS tube; the first end of the second resistor is connected to the gate of the second MOS tube, and the second end of the second resistor is grounded; the source of the second MOS tube is grounded, and the drain of the second MOS tube is connected to the second switch circuit.

[0020] Optionally, the second switch circuit includes a third resistor, a sixth resistor and a third MOS tube;

[0021] Among them, the first end of the third resistor is connected to the second end of the sixth resistor and the gate of the third MOS tube, and the second end of the third resistor is connected to the first switch circuit; the first end of the sixth resistor is connected to the source of the third MOS tube, and the second end of the sixth resistor is connected to the gate of the third MOS tube; the source of the third MOS tube is connected to the driving voltage stabilizing circuit, and the drain of the third MOS tube is connected to the third switch circuit.

[0022] Optionally, the third switch circuit includes a fourth resistor, a ninth resistor and a first MOS tube;

[0023] Among them, the first end of the fourth resistor is connected to the first end of the ninth resistor and the gate of the first MOS tube, and the second end of the fourth resistor is connected to the second switch circuit; the first end of the ninth resistor is connected to the gate of the first MOS tube, and the second end of the ninth resistor is grounded; the source of the first MOS tube is grounded, and the drain of the first MOS tube is connected to the energy storage circuit.

[0024] Optionally, the energy storage circuit includes a seventh resistor, an eighth resistor, a first diode and a first capacitor;

[0025] Among them, the first end of the seventh resistor is connected to the first end of the fifth resistor, and the second end of the seventh resistor is connected to the second end of the first capacitor and the third switch circuit; the first end of the eighth resistor is connected to the first end of the first capacitor and the cathode of the laser tube, and the second end of the eighth resistor is connected to the second end of the tenth resistor; the anode of the first diode is connected to the first end of the eighth resistor, and the cathode of the first diode is connected to the second end of the eighth resistor.

[0026] Optionally, the first MOS transistor is an N-channel MOS transistor.

[0027] Optionally, the second MOS transistor is an N-channel MOS transistor.

[0028] Optionally, the third MOS transistor is a P-channel MOS transistor.

[0029] In a second aspect, an embodiment of the utility model provides a handheld laser rangefinder, comprising the handheld laser rangefinder laser driving circuit described in the first aspect above.

[0030] (III) Beneficial effects

[0031] The handheld laser rangefinder laser driving circuit and the handheld laser rangefinder of the utility model, by setting a dedicated driving power supply and integrating a ZD1 voltage regulator tube for voltage stabilization control, effectively eliminates the influence of power supply voltage fluctuation on laser driving, ensures that the laser tube can obtain continuous and stable voltage supply when working, and greatly improves the accuracy and consistency of distance measurement.

[0032] The energy storage circuit is designed so that a fixed amount of energy can be accumulated before each laser shot. The constant TX signal period ensures the consistency of the energy storage process, so that the energy of each laser shot remains the same, which is crucial to ensure the repeatability and accuracy of the measurement results.

[0033] The user is allowed to indirectly control the charging time of the energy storage capacitor C1 by adjusting the cycle of the TX signal, thereby achieving fine adjustment of the laser emission power. This design not only enhances the adaptability of the device, but also optimizes the laser output according to different measurement requirements and environmental conditions, improving the measurement efficiency and range.

[0034] Adding the D1 diode as a protection measure can effectively suppress the reverse high voltage generated by the laser tube at the moment of shutting down. By guiding the excess voltage to the ground (GND), the safety of the laser tube is guaranteed and the service life of the laser tube is extended.

[0035] By adjusting the size of the R10 resistor, not only can the width of the emitted laser pulse be flexibly controlled, but the maximum current passing through the D2 diode can also be set synchronously, thereby ensuring the safe operation of the circuit while meeting different pulse width requirements, avoiding overcurrent damage, and improving the flexibility and reliability of the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The figure is a schematic diagram of the structure of the laser driving circuit of the handheld laser rangefinder in the first embodiment of the utility model.

[0037] [Description of Reference Numerals]

[0038] R1: first resistor; R2: second resistor; R3: third resistor; R4: fourth resistor; R5: fifth resistor; R6: sixth resistor; R7: seventh resistor; R8: eighth resistor; R9: ninth resistor; R10: tenth resistor;

[0039] Q1: first MOS tube; Q2: second MOS tube; Q3: third MOS tube;

[0040] C1: first capacitor; C2: second capacitor;

[0041] D1: first diode; D2: laser tube;

[0042] ZD1: Zener diode;

[0043] TX: trigger signal receiving end. DETAILED DESCRIPTION

[0044] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0045] Embodiment 1

[0046] This embodiment provides a laser driving circuit for a handheld laser rangefinder, and its structure is as follows: Figure 1 As shown, including:

[0047] Driving voltage stabilizing circuit: This circuit consists of a fifth resistor R5, a second capacitor C2, and a voltage stabilizing diode ZD1. One end of the fifth resistor R5 is connected to the positive electrode of the power supply, and the other end is connected to the first end of the second capacitor C2 and the cathode of the voltage stabilizing diode ZD1. The second end of the second capacitor C2 is grounded, and the anode of the voltage stabilizing diode ZD1 is also grounded. This connection method ensures that even if the power supply voltage fluctuates, the voltage provided to the subsequent circuit can remain stable through the voltage stabilizing effect of the voltage stabilizing diode ZD1, laying the foundation for the precise operation of the laser.

[0048] Energy storage circuit: The energy storage circuit is composed of the seventh resistor R7, the first capacitor C1, the eighth resistor R8 and the first diode D1. When receiving the trigger signal from the trigger signal receiving terminal TX, the energy storage circuit starts to charge the first capacitor C1 until the next transmission requirement. The configuration of the seventh resistor R7 and the eighth resistor R8 ensures the stable accumulation of energy during the charging process, and the first diode D1 acts as a protection element to prevent the reverse voltage from damaging the laser tube D2 when the laser tube D2 is turned off, thereby ensuring the safe operation and long-term stability of the laser.

[0049] Laser emission circuit: This part includes the trigger signal receiving terminal TX, multiple switch circuits (first switch circuit, second switch circuit, third switch circuit), the tenth resistor R10 and the laser tube D2. The switch circuit is composed of multiple resistors (R1, R2, R3, R4, R6, R9) and MOS tubes (Q1, Q2, Q3) connected in a specific order.

[0050] The first switch circuit includes a first resistor R1, a second resistor R2 and a second MOS transistor Q2; wherein a first end of the first resistor R1 is connected to a trigger signal receiving end TX, and a second end of the first resistor R1 is connected to the second resistor R2 and a gate of the second MOS transistor Q2; a first end of the second resistor R2 is connected to a gate of the second MOS transistor Q2, and a second end of the second resistor R2 is grounded; a source of the second MOS transistor Q2 is grounded, and a drain of the second MOS transistor Q2 is connected to a second end of a third resistor R3 in the second switch circuit.

[0051] The second switch circuit includes a third resistor R3, a sixth resistor R6 and a third MOS transistor Q3; wherein a first end of the third resistor R3 is connected to a second end of the sixth resistor R6 and a gate of the third MOS transistor Q3, and a second end of the third resistor R3 is connected to the first switch circuit; a first end of the sixth resistor R6 is connected to a source of the third MOS transistor Q3, and a second end of the sixth resistor R6 is connected to a gate of the third MOS transistor Q3; a source of the third MOS transistor Q3 is connected to a driving voltage stabilizing circuit, and a drain of the third MOS transistor Q3 is connected to a second end of a fourth resistor R4 in the third switch circuit.

[0052] The third switch circuit includes a fourth resistor R4, a ninth resistor R9 and a first MOS transistor Q1; wherein a first end of the fourth resistor R4 is connected to a first end of the ninth resistor R9 and a gate of the first MOS transistor Q1, and a second end of the fourth resistor R4 is connected to the second switch circuit; a first end of the ninth resistor R9 is connected to the gate of the first MOS transistor Q1, and a second end of the ninth resistor R9 is grounded; a source of the first MOS transistor Q1 is grounded, and a drain of the first MOS transistor Q1 is connected to the energy storage circuit.

[0053] The types of MOS tubes are N-channel (Q1, Q2) and P-channel (Q3) to achieve effective control and switching of current. The trigger signal first enters the first switch circuit, and through the sequential conduction and cutoff of the MOS tubes, it finally controls the emission of the laser tube D2. The tenth resistor R10 not only adjusts the width of the laser pulse, but also limits the maximum current passing through the laser tube D2, ensuring the safety and efficiency of the circuit operation.

[0054] In summary, the laser driving circuit of the handheld laser rangefinder in the first embodiment successfully overcomes the problems of unstable voltage and high cost in the prior art through a carefully designed circuit structure and component selection, thereby improving the accuracy of distance measurement and the practicality of the device.

[0055] Embodiment 2

[0056] This embodiment provides a handheld laser rangefinder, including the handheld laser rangefinder laser driving circuit described in the first embodiment.

[0057] Designers and decorators can use this handheld laser rangefinder to easily measure room dimensions and plan furniture layouts;

[0058] In outdoor adventures, geological exploration and urban planning, this handheld laser rangefinder is an ideal tool for quickly acquiring terrain data and drawing accurate maps due to its portability and accuracy.

[0059] In warehouse inventory management and cargo placement planning, this handheld laser rangefinder can assist staff in efficiently measuring shelf spacing and storage capacity, optimizing storage space utilization, and improving logistics efficiency.

[0060] In the description of the present utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present utility model, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0063] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0064] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A laser driving circuit for a handheld laser rangefinder, characterized in that: include: A driving voltage stabilizing circuit for providing a stable operating voltage to a laser emission circuit; Energy storage circuit used to store energy before laser emission. When the circuit is turned on, it discharges rapidly to provide pulsed energy for the laser emission circuit. A laser emission circuit for receiving a trigger signal, controlling the on and off of the current and thus controlling the laser emission; Wherein, the driving voltage stabilizing circuit comprises a fifth resistor (R5), a second capacitor (C1) and a voltage stabilizing diode (ZD1); The first end of the second capacitor (C2) is connected to the second end of the fifth resistor (R5) and the cathode of the Zener diode (ZD1), the second end of the second capacitor (C2) is grounded, the cathode of the Zener diode (ZD1) is connected to the second end of the fifth resistor (R5), and the anode of the Zener diode (ZD1) is grounded.

2. The laser driving circuit of the handheld laser rangefinder according to claim 1, characterized in that: The laser emission circuit comprises a trigger signal receiving terminal (TX), a first switch circuit, a second switch circuit, a third switch circuit, a tenth resistor (R10) and a laser tube (D2); The trigger signal receiving end (TX), the first switch circuit, the second switch circuit and the third switch circuit are connected in sequence; the second switch circuit is connected to the first end of the second capacitor (C2); the first end of the tenth resistor (R10) is connected to the anode of the laser tube (D2); the second end of the tenth resistor (R10) is connected to the energy storage circuit and grounded; and the cathode of the laser tube (D2) is connected to the energy storage circuit.

3. The laser driving circuit of the handheld laser rangefinder according to claim 2, characterized in that: The first switch circuit comprises a first resistor (R1), a second resistor (R2) and a second MOS transistor (Q2); The first end of the first resistor (R1) is connected to the trigger signal receiving end (TX), the second end of the first resistor (R1) is connected to the second resistor (R2) and the gate of the second MOS tube (Q2); the first end of the second resistor (R2) is connected to the gate of the second MOS tube (Q2), and the second end of the second resistor (R2) is grounded; the source of the second MOS tube (Q2) is grounded, and the drain of the second MOS tube (Q2) is connected to the second switch circuit.

4. The laser driving circuit of the handheld laser rangefinder according to claim 2, characterized in that: The second switch circuit comprises a third resistor (R3), a sixth resistor (R6) and a third MOS transistor (Q3); The first end of the third resistor (R3) is connected to the second end of the sixth resistor (R6) and the gate of the third MOS tube (Q3), and the second end of the third resistor (R3) is connected to the first switch circuit; the first end of the sixth resistor (R6) is connected to the source of the third MOS tube (Q3), and the second end of the sixth resistor (R6) is connected to the gate of the third MOS tube (Q3); the source of the third MOS tube (Q3) is connected to the driving voltage stabilization circuit, and the drain of the third MOS tube (Q3) is connected to the third switch circuit.

5. The laser driving circuit of the handheld laser rangefinder according to claim 2, characterized in that: The third switch circuit comprises a fourth resistor (R4), a ninth resistor (R9) and a first MOS tube (Q1); The first end of the fourth resistor (R4) is connected to the first end of the ninth resistor (R9) and the gate of the first MOS transistor (Q1), and the second end of the fourth resistor (R4) is connected to the second switch circuit; the first end of the ninth resistor (R9) is connected to the gate of the first MOS transistor (Q1), and the second end of the ninth resistor (R9) is grounded; the source of the first MOS transistor (Q1) is grounded, and the drain of the first MOS transistor (Q1) is connected to the energy storage circuit.

6. The laser driving circuit of the handheld laser rangefinder according to claim 5, characterized in that: The energy storage circuit comprises a seventh resistor (R7), an eighth resistor (R8), a first diode (D1) and a first capacitor (C1); The first end of the seventh resistor (R7) is connected to the first end of the fifth resistor (R5), and the second end of the seventh resistor (R7) is connected to the second end of the first capacitor (C1) and the third switch circuit; the first end of the eighth resistor (R8) is connected to the first end of the first capacitor (C1) and the cathode of the laser tube (D2), and the second end of the eighth resistor (R8) is connected to the second end of the tenth resistor (R10); the anode of the first diode (D1) is connected to the first end of the eighth resistor (R8), and the cathode of the first diode (D1) is connected to the second end of the eighth resistor (R8).

7. The laser driving circuit of the handheld laser rangefinder according to claim 5, characterized in that: The first MOS transistor (Q1) is an N-channel MOS transistor.

8. The laser driving circuit of the handheld laser rangefinder according to claim 3, characterized in that: The second MOS transistor (Q2) is an N-channel MOS transistor.

9. The laser driving circuit of the handheld laser rangefinder according to claim 4, characterized in that: The third MOS tube (Q3) is a P-channel MOS tube.

10. A handheld laser rangefinder, characterized in that: A handheld laser rangefinder laser driving circuit comprising any one of claims 1-9.

Images