Laser driving circuit, laser driving circuit board and laser equipment

Abstract

The invention discloses a laser driving circuit, a laser driving circuit board and laser equipment, and relates to the technical field of laser display, the laser driving circuit comprises an oscillation circuit and a switching circuit, and the oscillation circuit is used for outputting an oscillation signal with a preset duty ratio; the first conduction end of the switching circuit is connected with the power supply end and the laser, the second conduction end is grounded, and the controlled end of the switching circuit is connected with the output end of the oscillating circuit; wherein the switching circuit is used for connecting or disconnecting a path between the power supply end and the laser according to a received oscillation signal. The invention aims to provide a miniaturized laser driving circuit.

Description

Technical Field

[0001] The invention relates to the technical field of electronic circuit boards, and in particular to a laser driving circuit, a laser driving circuit board and a laser device. Background Art

[0002] Laser equipment in the prior art is usually equipped with a laser driving circuit to drive the laser, and the laser driving circuit usually includes a control module, an amplifier circuit, a crystal oscillator module, etc. The circuits in the control module are complex, there are many devices, and it occupies a large space, which is not conducive to the miniaturization design of the laser equipment. Summary of the invention

[0003] The main purpose of the present invention is to provide a laser driving circuit, a laser driving circuit board and a laser device, aiming to provide a miniaturized laser driving circuit.

[0004] To achieve the above object, the laser driving circuit proposed in the present invention is applied to a laser device, wherein the laser device includes a laser, and the laser driving circuit includes:

[0005] An oscillation circuit, the oscillation circuit being used to output an oscillation signal with a preset duty cycle;

[0006] A switch circuit, wherein a first conduction end of the switch circuit is connected to a power supply end and the laser, a second conduction end is connected to a ground end, and a controlled end of the switch circuit is connected to an output end of the oscillation circuit;

[0007] The switch circuit is used to open or close the path between the power supply terminal and the ground terminal according to the received oscillation signal, so as to activate or cut off the laser.

[0008] In one embodiment, the oscillation circuit includes an RC oscillation circuit or an RL oscillation circuit.

[0009] In one embodiment, the oscillation circuit is specifically an RC oscillation circuit;

[0010] Wherein, the preset duty cycle is set by the capacitance and resistance of the RC oscillation circuit.

[0011] In one embodiment, the laser driving circuit further comprises a comparison circuit, and the comparison circuit is arranged between the oscillation circuit and the switch circuit;

[0012] The comparison circuit is used to output a level signal to the switch circuit according to the oscillation signal;

[0013] The switch circuit is used to open or open the path between the power supply terminal and the ground terminal according to the received level signal, so as to activate or cut off the laser.

[0014] In one embodiment, the comparison circuit includes a first comparator, a first input terminal of the first comparator is connected to the output terminal of the oscillation circuit, a second input terminal is connected to the second conduction terminal of the switch circuit, and an output terminal of the first comparator is connected to the controlled terminal of the switch circuit.

[0015] In one embodiment, the laser driving circuit further includes a current limiting circuit, and the current limiting circuit is arranged at the second conducting end of the switch circuit.

[0016] The present invention also provides a laser driving circuit board, comprising:

[0017] substrate;

[0018] The laser driving circuit as described in any one of the above items is arranged on the substrate.

[0019] In one embodiment, the power supply end includes a power positive wiring area and a power negative wiring area arranged on the substrate;

[0020] A first pointed window is provided in the positive wiring area of ​​the power supply, and a second pointed window is provided in the negative wiring area of ​​the power supply;

[0021] Wherein, the tip of the first pointed window and the tip of the second pointed window are arranged toward each other and aligned.

[0022] In one embodiment, a distance between the tips of the first apical fenestration and the second apical fenestration is less than 0.3 mm.

[0023] In one embodiment, a distance between the tips of the first tip fenestration and the second tip fenestration is greater than twice a minimum wiring distance.

[0024] In one embodiment, the tip of the first apical window and the tip of the second apical window are acute angles.

[0025] In one embodiment, an angle between the tip of the first apical window and the tip of the second apical window is not less than 30 degrees and not more than 60 degrees.

[0026] In one embodiment, the shapes of the first tip window and the second tip window are specifically triangular or teardrop-shaped.

[0027] In one embodiment, when the first tip window and the second tip window are triangles, the triangles are isosceles triangles, and the length of the base of the triangle is greater than 0.2 mm.

[0028] In one embodiment, the first apical fenestration and the second apical fenestration are arranged as a apical fenestration group;

[0029] A plurality of groups of the tip window groups are arranged side by side on the substrate.

[0030] The present invention further provides a laser device, characterized in that the laser device comprises a laser and a laser driving circuit board as described in any one of the above items.

[0031] In summary, the present invention provides a miniaturized laser driving circuit, which is conducive to the miniaturized design of laser equipment. Among them, through the cooperation between the oscillation circuit and the switching circuit, the precise control of the working state of the laser is realized. The oscillation signal generated by the oscillation circuit realizes the periodic conduction and disconnection of the path between the power supply end and the ground end by controlling the controlled end of the switching circuit. When the oscillation signal is at a high level, the switching circuit is closed, and the laser obtains sufficient current to emit light; when the oscillation signal is at a low level, the switching circuit is disconnected, and the laser stops emitting light to realize the light emission of the laser. In this way, the laser driving circuit provided by the present invention can realize laser driving, and simplifies the control module in the exemplary laser driving circuit, thereby reducing the circuit complexity and the number of devices, greatly saving space, and facilitating the miniaturized design of laser equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0033] Figure 1 A schematic diagram of a first embodiment of a laser driving circuit provided by the present invention;

[0034] Figure 2 A schematic diagram of a second embodiment of a laser driving circuit provided by the present invention;

[0035] Figure 3 A schematic diagram of a third embodiment of a laser driving circuit provided by the present invention;

[0036] Figure 4 A schematic diagram of a fourth embodiment of a laser driving circuit provided by the present invention;

[0037] Figure 5 This is a schematic structural diagram of an embodiment of a laser driver circuit board provided by the present invention.

[0038] Description of Figure Numbers:

[0039] Laser driving circuit 10, oscillation circuit 100, switch circuit 200, comparison circuit 300;

[0040] The laser driving circuit board 20 , the positive wiring area 410 , the first tip window 411 , the negative wiring area 420 , and the second tip window 421 .

[0041] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0045] Laser equipment in the prior art is usually equipped with a laser driving circuit to drive the laser, and the laser driving circuit usually includes a control module, an amplifier circuit, a crystal oscillator module, etc. The circuits in the control module are complex, there are many devices, and it occupies a large space, which is not conducive to the miniaturization design of the laser equipment.

[0046] To achieve the above purpose, Figure 1As shown, the laser driving circuit 10 proposed in the present invention is applied to a laser device, wherein the laser device includes a laser, and the laser driving circuit 10 includes an oscillation circuit 100 and a switch circuit 200; the oscillation circuit 100 is used to output an oscillation signal with a preset duty cycle; the first conduction end of the switch circuit 200 is connected to the power supply end, the second conduction end is connected to the ground end, and the controlled end of the switch circuit 200 is connected to the output end of the oscillation circuit 100; the laser is connected to the first conduction end or the second conduction end; wherein the switch circuit 200 is used to turn on or off the path between the power supply end and the ground end according to the received oscillation signal, so as to activate or cut off the laser.

[0047] In this embodiment, the oscillation circuit 100 is used to generate an oscillation signal with a preset duty cycle. The duty cycle refers to the ratio of the time the signal is at a high level to the entire cycle time in one cycle. The specific value of the preset duty cycle can be determined according to actual application or actual research and development needs. The preset duty cycle directly affects the luminous intensity, frequency and energy efficiency of the laser. Therefore, the preset duty cycle needs to be set according to demand.

[0048] Optionally, the oscillation circuit 100 is composed of components such as a crystal oscillator, a resistor, and a capacitor, and can output a stable and satisfactory oscillation signal, which serves as a control input of a subsequent switch circuit 200 and controls the working state of the laser.

[0049] In this embodiment, the first conducting end of the switch circuit 200 is used as a power supply end for connecting an external power supply, and the second conducting end of the switch circuit 200 is connected to the ground end. When the switch circuit 200 is turned on, the electric energy of the power supply end flows from the power supply end to the ground end, so that the entire loop is generated, and the path between the power supply end and the ground end is turned on. The controlled end of the switch circuit 200 is connected to the output end of the oscillation circuit 100, and receives the oscillation signal from the oscillation circuit 100. When the oscillation signal is at a high level, the switch circuit 200 is closed, and the path between the power supply end and the ground end is turned on; and when the oscillation signal is at a low level, the switch circuit 200 is turned off. Through this simple switching mechanism, efficient control of the working state of the laser can be achieved.

[0050] In this embodiment, the laser is connected to the first conductive end. Therefore, when the switch circuit 200 is closed according to the instruction of the oscillation signal, the electric energy of the power supply end flows through the laser to the ground end, providing the necessary working voltage and current for the laser, thereby starting the laser and causing it to start emitting light. On the contrary, when the oscillation signal indicates that the switch circuit 200 is disconnected, the path between the power supply end and the ground end is cut off, the laser loses the power supply, and thus stops emitting light, so that the laser stops working. Through this simple switching mechanism, the start and stop of the laser are accurately and efficiently controlled, which not only meets the demand of the laser device for light efficiency, but also simplifies the circuit design, realizes miniaturized design, and ultimately is conducive to the miniaturization of the laser device.

[0051] In summary, the present invention provides a miniaturized laser driving circuit 10, which is conducive to the miniaturized design of laser equipment. Among them, through the cooperation between the oscillation circuit 100 and the switch circuit 200, the precise control of the working state of the laser is realized. The oscillation signal generated by the oscillation circuit 100 realizes the periodic conduction and disconnection of the path between the power supply end and the ground end by controlling the controlled end of the switch circuit 200. When the oscillation signal is at a high level, the switch circuit 200 is closed, and the laser obtains sufficient current to emit light; when the oscillation signal is at a low level, the switch circuit 200 is disconnected, and the laser stops emitting light to realize the light emission of the laser. In this way, the laser driving circuit 10 provided by the present invention can realize laser driving, and simplifies the control module in the exemplary laser driving circuit, thereby reducing the circuit complexity and the number of devices, greatly saving space, and facilitating the miniaturized design of the laser equipment.

[0052] Optionally, the oscillation circuit 100 includes an RC oscillation circuit 100. It is understandable that the RC oscillation circuit 100 is composed of a resistor and a capacitor to form a tuning circuit, and the RC oscillation circuit 100 may also include an amplification circuit, a frequency selection network, a positive feedback network, and an amplitude stabilization link. The RC oscillation circuit 100 utilizes the charging and discharging characteristics of the capacitor and the current limiting effect of the resistor to feed back a portion of the output signal to the input terminal through the positive feedback network to form a continuous oscillation. The oscillation frequency is determined by the values ​​of the resistor and the capacitor, and the calculation formula is usually f=1 / (2πRC), where f is the oscillation frequency, R is the resistance value of the resistor, and C is the capacitance value of the capacitor. And the RC oscillation circuit 100 can generate a stable oscillation signal in a low frequency range (such as 1Hz to 1MHz), which is suitable for low frequency scenarios. It should be noted that the RC oscillation circuit 100 has a simple structure, does not require too many circuits, and the device is small, which is conducive to miniaturization design.

[0053] Optionally, the oscillation circuit 100 includes an RL oscillation circuit 100. It is understandable that the RL oscillation circuit 100 is mainly composed of a resistor and an inductor, forming a basic tuning circuit. The RL oscillation circuit 100 feeds back a part of the output signal to the input terminal through a positive feedback network, thereby forming a continuous oscillation. Unlike the RC oscillation circuit 100, the RL oscillation circuit 100 is more suitable for generating an oscillation signal with a higher frequency. Although the specific oscillation frequency also depends on the values ​​of the resistor and the inductor, the frequency range of the RL oscillation circuit 100 is generally higher than that of the RC oscillation circuit 100, and can cover a wide range from medium frequency to high frequency.

[0054] In this embodiment, the oscillation circuit 100 is an RC oscillation circuit 100 , wherein the preset duty cycle is set by the capacitance and the resistance of the RC oscillation circuit 100 .

[0055] It is understandable that the RC oscillator circuit 100 in this embodiment can determine the preset duty cycle required for operation by adjusting or presetting the capacitance value of the capacitor and the resistance value of the resistor. In the RC oscillator circuit 100, the charging and discharging process of the capacitor and the limiting effect of the resistor on the current jointly affect the rising and falling edge times of the signal, thereby determining the size of the duty cycle. Therefore, by adjusting the values ​​of the capacitor and the resistor, the duty cycle of the oscillation signal output by the RC oscillator circuit 100 can be accurately controlled to meet the needs of specific application scenarios. In this way, the RC oscillator circuit 100 not only provides a stable oscillation signal, but also has the ability to flexibly adjust the duty cycle, thereby enhancing its applicability in various laser devices.

[0056] It should be noted that the oscillation circuit 100 mentioned above is connected to the switch circuit 200, and the oscillation signal output by the oscillation circuit 100 controls the switch circuit 200 to be turned on or off, that is, the switch circuit 200 will directly respond to the original signal output by the oscillation circuit 100, which may lead to signal level mismatch, that is, the high level of the oscillation signal may not be enough to fully turn on the switch element, or the low level fails to fully turn it off, resulting in an incomplete switching state. In addition, due to the lack of a threshold judgment function, any noise or fluctuation will be directly transmitted to the switch circuit 200, increasing the risk of unnecessary switching actions or unstable operations, and reducing the stability and performance of the system. At the same time, non-ideal waveforms in the oscillation signal (such as imperfect rising or falling edges) will directly affect the switching time point, thereby affecting the actual duty cycle and duty cycle accuracy of the laser, causing its output power and frequency characteristics to deviate from the expected design requirements.

[0057] In one embodiment, if Figure 2 and Figure 3As shown, in order to solve the above-mentioned problem, the laser driving circuit 10 also includes a comparison circuit 300, and the comparison circuit 300 is arranged between the oscillation circuit 100 and the switch circuit 200; the comparison circuit 300 is used to output a level signal to the switch circuit 200 according to the oscillation signal to control the switch circuit 200 to be turned on or off.

[0058] In this embodiment, the comparison circuit 300 includes a first comparator U1, a first input terminal of the first comparator U1 is connected to the output terminal of the oscillation circuit 100, a second input terminal is connected to the second conduction terminal of the switch circuit 200, and an output terminal of the first comparator U1 is connected to the controlled terminal of the switch circuit 200.

[0059] It can be understood that the first comparator U1 is used to process the oscillation signal from the oscillation circuit 100, and output a corresponding level signal to the switch circuit 200 according to the signal, so as to accurately control the on or off state of the switch circuit 200. Specifically, the first input end of the first comparator U1 receives the oscillation signal from the oscillation circuit 100, and its second input end is connected to the second on end (ground end) of the switch circuit 200. This means that one input end of the first comparator U1 senses the change of the oscillation signal, and the other input end is maintained at a relatively stable reference potential (usually ground potential). The output end of the first comparator U1 is connected to the controlled end of the switch circuit 200, and is responsible for sending control instructions to the switch circuit 200. When the voltage of the oscillation signal exceeds the set threshold, the comparator outputs a high level signal, so that the switch circuit 200 is closed, allowing current to pass through the laser; conversely, when the voltage of the oscillation signal is lower than the threshold, the comparator outputs a low level signal, causing the switch circuit 200 to be disconnected, cutting off the current path. In this way, the comparison circuit 300 ensures that the action of the switch circuit 200 strictly follows the change of the oscillation signal, thereby achieving more accurate control of the working state of the laser.

[0060] In one embodiment, the laser driving circuit 10 further includes a current limiting circuit, which is disposed at the second conduction end of the switch circuit 200. It is understandable that the current limiting circuit is mainly used to limit the current passing through it during the operation of the laser to protect the laser from overcurrent damage and ensure its stable operation. When the switch circuit 200 is closed according to the oscillation signal, a path between the power supply terminal and the ground terminal is established, and current begins to flow through the laser. At this time, the current limiting circuit monitors and controls the current intensity flowing through the laser to ensure that it does not exceed the set safety threshold. In this way, the current limiting circuit not only helps to extend the service life of the laser, but also optimizes its luminous efficiency and performance. In this embodiment, the current limiting circuit is specifically a first resistor R1.

[0061] It should be explained that, in one embodiment, Figure 3 As shown, the switch circuit 200 can be specifically a transistor Q1, the controlled end of the transistor Q1 is connected to the output end of the first comparator U1, and the first conducting end of the transistor Q1 is connected to the laser (at Figure 3 The second conducting end of the transistor is connected to the current limiting circuit (in Figure 3 The first resistor R1).

[0062] like Figure 4 As shown, Figure 4 The laser switch control process of the laser driving circuit 10 according to the present invention is shown. Figure 4 and Figure 3 To illustrate, when the circuit is powered on, the oscillation circuit 100 starts working and generates an oscillation signal with a preset duty cycle. The oscillation signal generated by the oscillation circuit 100 is sent to the comparison circuit 300. Assume that the first input terminal of the first comparator U1 receives the oscillation signal Vi, and its second input terminal is connected to a reference voltage Vr (which can be a ground potential). When the voltage of the oscillation signal Vi exceeds the set threshold Vr, the comparator outputs a high-level signal to the switch circuit 200. After receiving the high-level signal, the switch circuit 200 is closed, so that the path between the power supply terminal and the ground terminal is turned on. At this time, the current passes through the laser, making it emit light. During this period, if the oscillation circuit 100 is based on RC, the capacitor will continue to charge or discharge, preparing for the state transition of the next cycle. As the oscillation signal changes, when the voltage of the oscillation signal Vi drops below the threshold Vr, the comparator outputs a low-level signal to the switch circuit 200. After receiving the low-level signal, the switch circuit 200 is disconnected, cutting off the path between the power supply terminal and the ground terminal, thereby stopping the power supply to the laser and the laser is extinguished.

[0063] like Figure 5 As shown, the present invention further provides a laser driving circuit board 20, which includes a substrate and a laser driving circuit 10 disposed on the substrate. It should be noted that the specific circuit of the laser driving circuit 10 refers to the above embodiment. Since the laser driving circuit board 20 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0064] It can be understood that, since the laser driving circuit 10 has the advantage of being conducive to miniaturized design, when the laser driving circuit 10 is applied to the laser driving circuit board 20, the laser driving circuit board 20 also has the advantage of being conducive to miniaturized design.

[0065] In some exemplary laser driving circuits, ESD devices are included to perform the function of electrostatic release. However, in the present laser driving circuit, there are no ESD devices. Therefore, in order to perform the work of electrostatic release, in the present invention, a corresponding window design is performed on the laser driving circuit board 20 to replace the ESD device to perform the function of electrostatic release, thereby further realizing a miniaturized design.

[0066] In one embodiment, the power end includes a positive power wiring area 410 and a negative power wiring area 420 arranged on the substrate; a first pointed window 411 is arranged in the positive power wiring area 410, and a second pointed window 421 is arranged in the negative power wiring area 420; wherein the tip of the first pointed window 411 and the tip of the second pointed window 421 are arranged facing each other and aligned.

[0067] It is understandable that the design of the first tip window 411 and the second tip window 421 utilizes the electric field concentration effect to promote static discharge. When there are protruding sharp parts on a conductor, the radius of curvature of these places is small, resulting in more dense distribution of charges in these areas, that is, the electric field concentration effect. When static charge accumulates in the positive power wiring area 410 and the negative power wiring area 420, the electric field strength in these areas will increase significantly due to the relative and aligned arrangement of the tips of the first tip window 411 and the second tip window 421. At this time, the charge tends to concentrate on the part with a larger curvature of the conductor, that is, the sharp edge or tip. Therefore, at the tip position of these window openings, the electric field becomes extremely strong, enough to overcome the insulating properties of the air and induce the tip discharge phenomenon. This discharge process provides a low impedance path for static electricity, allowing the charge to be quickly released to the ground through the shortest distance between the two points, thereby effectively preventing the damage that may be caused by static electricity accumulation. In this way, electrostatic discharge is performed through the first tip opening 411 and the second tip opening 421, which simplifies the design of the circuit board and does not require the addition of special ESD protection components, which saves space and reduces costs, and contributes to the miniaturization and lightweight design of the product. Secondly, electrostatic protection is performed through physical structures rather than additional components, which reduces the risk caused by component failure and improves the overall reliability of the system.

[0068] In this embodiment, the positive power wiring area 410 and the negative power wiring area 420 are respectively paved with copper foils, and the first tip opening 411 and the second tip opening 421 can be respectively provided on the corresponding copper foils.

[0069] In one embodiment, the distance between the tips of the first tip window 411 and the second tip window 421 is less than 0.3 mm. It is understood that the short distance design ensures effective electrostatic discharge even at a lower voltage, provides a low impedance path, and enables static charge to be quickly released to the ground through the shortest path, avoiding the problem of poor ESD effect caused by excessive distance. Therefore, the distance setting of less than 0.3 mm improves the efficiency and reliability of electrostatic protection.

[0070] In one embodiment, the distance between the tips of the first tip window 411 and the second tip window 421 is greater than twice the minimum wiring distance. It is understandable that in order to avoid problems caused by repeated ESD events at the two tip corners during long-term use. Each ESD discharge may leave a trace amount of conductive medium residue at these contact points. Over time, these residues gradually accumulate and may eventually form a permanent conductive path, causing circuit short circuits and system failures. Therefore, setting the distance between the tips to be greater than twice the minimum wiring distance can effectively reduce the possibility of the above problems, because the larger spacing reduces the possibility of conductive residues accumulating to a level sufficient to cause a short circuit.

[0071] In one embodiment, the tip of the first pointed window 411 and the tip of the second pointed window 421 are acute angles.

[0072] It is understandable that by designing the tips of the first tip window 411 and the second tip window 421 as acute angles, the electric field concentration effect can be fully utilized, that is, the charge tends to concentrate at the part with larger curvature of the conductor, and a stronger electric field strength can be generated at the acute angle, thereby more effectively inducing the tip discharge phenomenon. In this way, the design of the acute angle reduces the breakdown voltage required for electrostatic discharge, and also promotes the rapid transfer of charge, so that static electricity can be quickly and reliably released to the ground through a low impedance path. On the other hand, the design of the acute angle helps to reduce the required space, which is conducive to the miniaturization design of the laser driver circuit board 20 while maintaining efficient electrostatic protection performance.

[0073] In one embodiment, an angle between the tip of the first tip window 411 and the tip of the second tip window 421 is not less than 30 degrees and not more than 60 degrees.

[0074] It is understandable that the tip angle of the first tip window 411 and the second tip window 421 should be no less than 30 degrees and no more than 60 degrees, so as to balance the effectiveness of electrostatic discharge and the reliability of long-term use. Too small an angle may lead to excessive concentration of the electric field, increase the risk of damage to the tip material or formation of conductive residues, and may cause short circuit failure; while too large an angle will weaken the electric field concentration effect and reduce the efficiency of electrostatic discharge. By setting the tip angle between 30 and 60 degrees, sufficient electric field strength is guaranteed to promote effective electrostatic discharge, while avoiding potential problems caused by too small an angle.

[0075] In one embodiment, the first tip window 411 and the second tip window 421 are specifically shaped as a triangle or a teardrop. It is understandable that, in addition to the triangle or teardrop shape, any other shape with a tip can also be used. The specific shape is not limited here, as long as the electric field concentration effect can be achieved.

[0076] In addition, the shapes of the first tip window 411 and the second tip window 421 can be the same or different, as long as both have a tip. In this embodiment, the first tip window 411 and the second tip window 421 have the same shape and size, because the tip windows of the same shape and size can ensure the symmetry of the electric field distribution, which helps to maintain the uniformity and consistency of the electrostatic discharge path on the circuit board. Moreover, the symmetrical design can also reduce the potential electromagnetic interference caused by the asymmetric electric field, thereby improving the electromagnetic compatibility performance of the entire system.

[0077] In this embodiment, the first tip window 411 and the second tip window 421 are triangles, the triangles are isosceles triangles, and the length of the base of the triangle is greater than 0.2 mm. It can be understood that the design of the isosceles triangle ensures that the two tips have the same electric field concentration effect, promotes symmetrical and uniform charge distribution, and thus improves the consistency and efficiency of electrostatic discharge. At the same time, the provision that the base length is greater than 0.2 mm not only ensures sufficient space to form an effective electric field strength, but also avoids manufacturing difficulties or material defects that may be caused by too small a size. In this way, it helps to maintain the compactness of the circuit board layout and support miniaturization design requirements.

[0078] In one embodiment, the first tip window 411 and the second tip window 421 are configured as a tip window group; a plurality of the tip window groups are arranged side by side on the substrate.

[0079] It is understandable that arranging multiple groups of the pointed window groups side by side on the substrate not only optimizes the electrostatic discharge path, but also improves the electrostatic protection capability of the entire circuit board. By arranging multiple pointed window groups, multiple low-impedance discharge channels can be formed between the positive power wiring area 410 and the negative power wiring area 420, ensuring that static electricity can be quickly and evenly released to the ground. Even if a group of windows fails for some reason, other groups can continue to provide effective electrostatic protection.

[0080] In summary, the laser driving circuit board 20 provided by the present invention integrates the laser driving circuit 10 provided by the present invention, which can facilitate the miniaturization design of the laser device. Moreover, the laser driving circuit board 20 provided by the present invention replaces the ESD device in the exemplary laser driving circuit by using the first tip opening 411 and the second tip opening 421, thereby reducing the wiring and devices on the laser driving circuit board 20, further realizing the miniaturization design.

[0081] The present invention further provides a laser device, characterized in that the laser device includes a laser and a laser driving circuit board 20. It should be noted that the laser device includes a laser and a laser driving circuit board 20, and the specific structure of the laser driving circuit board 20 refers to the above embodiment. Since the laser device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0082] Optionally, in some examples, the laser device can be any device that utilizes a laser, and can be a smart wearable device, such as AR glasses / head-mounted displays, VR glasses / head-mounted displays. In some examples, the laser device can be industrial processing equipment, medical instruments, optical communication systems, laser printers, barcode scanners, or any application device that requires an efficient and reliable laser source.

[0083] It is understandable that the laser of the laser device can be connected to the laser driving circuit board 20 to realize the light emission of the laser. Moreover, since the laser driving circuit board 20 realizes a miniaturized design, the laser device can be advantageously miniaturized when using the laser driving circuit board 20.

[0084] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A laser driving circuit, characterized in that: Applied to laser equipment, the laser equipment includes a laser, and the laser driving circuit includes: An oscillation circuit, the oscillation circuit being used to output an oscillation signal with a preset duty cycle; A switch circuit, wherein a first conduction end of the switch circuit is connected to a power supply end and the laser, a second conduction end is connected to a ground end, and a controlled end of the switch circuit is connected to an output end of the oscillation circuit; The switch circuit is used to open or close the path between the power supply terminal and the ground terminal according to the received oscillation signal, so as to activate or cut off the laser.

2. The laser driving circuit according to claim 1, characterized in that: The oscillation circuit includes an RC oscillation circuit or an RL oscillation circuit.

3. The laser driving circuit according to claim 2, characterized in that: The oscillation circuit is specifically an RC oscillation circuit; Wherein, the preset duty cycle is set by the capacitance and resistance of the RC oscillation circuit.

4. The laser driving circuit according to any one of claims 1 to 3, characterized in that: The laser driving circuit further comprises a comparison circuit, which is arranged between the oscillation circuit and the switch circuit; The comparison circuit is used to output a level signal to the switch circuit according to the oscillation signal; The switch circuit is used to open or open the path between the power supply terminal and the ground terminal according to the received level signal, so as to activate or cut off the laser.

5. The laser driving circuit according to claim 4, characterized in that: The comparison circuit comprises a first comparator, a first input terminal of the first comparator is connected to the output terminal of the oscillation circuit, a second input terminal is connected to the second conduction terminal of the switch circuit, and an output terminal of the first comparator is connected to the controlled terminal of the switch circuit.

6. The laser driving circuit according to any one of claims 1 to 3, characterized in that: The laser driving circuit further includes a current limiting circuit, and the current limiting circuit is arranged at the second conducting end of the switch circuit.

7. A laser driving circuit board, characterized in that: include: substrate; The laser driving circuit according to any one of claims 1 to 6, wherein the laser driving circuit is arranged on the substrate.

8. The laser driving circuit board according to claim 7, characterized in that: The power supply end includes a power supply positive electrode wiring area and a power supply negative electrode wiring area arranged on the substrate; A first pointed window is provided in the positive wiring area of ​​the power supply, and a second pointed window is provided in the negative wiring area of ​​the power supply; Wherein, the tip of the first pointed window and the tip of the second pointed window are arranged toward each other and aligned.

9. The laser driving circuit board according to claim 8, characterized in that: The distance between the tips of the first apical fenestration and the second apical fenestration is less than 0.3 mm.

10. The laser driving circuit board according to claim 9, characterized in that: A distance between the tips of the first tip fenestration and the second tip fenestration is greater than twice a minimum wiring distance.

11. The laser driving circuit board according to claim 8, characterized in that: The tip of the first apex window and the tip of the second apex window are acute angles.

12. The laser driving circuit board according to claim 11, characterized in that: The angle between the tip of the first pointed window and the tip of the second pointed window is not less than 30 degrees and not more than 60 degrees.

13. The laser driving circuit board according to claim 8, characterized in that: The shapes of the first tip window and the second tip window are specifically triangular or teardrop-shaped.

14. The laser driving circuit board according to claim 13, characterized in that: When the first tip window and the second tip window are triangles, the triangles are isosceles triangles, and the length of the base of the triangle is greater than 0.2 mm.

15. The laser driving circuit board according to any one of claims 8 to 14, characterized in that: The first apex fenestration and the second apex fenestration are arranged as a apex fenestration group; A plurality of groups of the tip window groups are arranged side by side on the substrate.

16. A laser device, characterized in that: The laser device comprises a laser and a laser driving circuit board as described in any one of claims 7-15.

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