A light curing machine and a light source control method thereof

Abstract

The application discloses a light curing machine and a light source control method thereof. The light curing machine comprises a light source, a first driving circuit, a second driving circuit, a tooth separation signal detection circuit and a control unit. The light source comprises a plurality of first light emitting chips and a second light emitting chip. The first driving circuit drives the plurality of first light emitting chips to be always on. The second driving circuit drives the second light emitting chip to be periodically on and off. The control unit acquires an electrical parameter detection value of the second light emitting chip in an off interval detected by the tooth separation signal detection circuit. When it is determined that the electrical parameter detection value is less than a preset electrical parameter value, it is determined that the light emitting part of the light source is not in an effective working position. At this time, the light source is controlled to be turned off. The application effectively avoids the situation that the light of the light emitting part irradiates the eyes of the patient or the doctor when the light source is moved out of the patient's oral cavity, and causes the eyes to be uncomfortable or causes damage to the eyes.

Description

Technical Field

[0001] This invention relates to the field of dental equipment technology, and more specifically, to a light curing machine and its light source control method. Background Technology

[0002] A light-curing machine is an oral device for dental restoration. It uses the principle of light curing to rapidly cure dental repair resin materials under the action of light waves within a specific wavelength range. This invention fills cavities or bonds brackets by turning off the power when the light-emitting part of the light source is not in an effective working position.

[0003] Existing light-curing machines require control buttons to turn the light source on and off. If the doctor forgets to turn off the light source after treatment and removes the light source from the patient's mouth, the light may shine into the patient's or doctor's eyes, causing discomfort or damage. Summary of the Invention

[0004] In view of this, the present invention discloses a light curing machine and its light source control method, so as to realize the power supply when it is determined that the light emitting part of the light source is not in an effective working position, effectively avoiding the occurrence of light from the light emitting part shining into the eyes of the patient or doctor when the light source is removed from the patient's mouth, causing eye discomfort or damage to the eyes.

[0005] A photopolymerization machine includes: a light source, a first driving circuit, a second driving circuit, a tooth separation signal detection circuit, and a control unit;

[0006] The light source includes: a plurality of first light-emitting chips and a second light-emitting chip, wherein the first light-emitting chips and the second light-emitting chip emit different colors;

[0007] The first driving circuit is connected to the control unit and the plurality of first light-emitting chips respectively, and is used to drive the plurality of first light-emitting chips to remain lit according to the first control signal output by the control unit after the light source is turned on;

[0008] The second driving circuit is connected to the control unit and the second light-emitting chip respectively, and is used to drive the second light-emitting chip to periodically turn on and off according to the second control signal output by the control unit after the light source is turned on;

[0009] The tooth separation signal detection circuit is connected to the power supply of the light curing machine, the control unit, and the common terminal of the second light-emitting chip and the second driving circuit. It is used to detect the electrical parameter detection value of the second light-emitting chip when it is in the extinguishing gap after the light source is turned on, and output the electrical parameter detection value to the control unit.

[0010] The control unit is used to determine whether the detected electrical parameter value is less than the preset electrical parameter value. If so, it determines that the light-emitting part of the light source is not in an effective working position and controls the light source to be turned off.

[0011] Optionally, the tooth separation signal detection circuit includes: a first filter circuit, an amplifier, and a second filter circuit;

[0012] The input terminal of the amplifier is connected to the power supply of the photocuring machine and the common terminal of the second light-emitting chip and the second driving circuit through the first filter circuit.

[0013] The output of the amplifier is connected to the control unit through the second filter circuit.

[0014] Optionally, the first filter circuit includes: a first resistor and a first capacitor;

[0015] The first resistor is connected to both the positive and negative input terminals of the amplifier.

[0016] The first capacitor is connected to the positive input terminal and the negative input terminal of the amplifier, respectively.

[0017] Optionally, the second filter circuit includes: a second resistor and a second capacitor;

[0018] One end of the second resistor is connected to the output terminal of the amplifier, and the other end of the second resistor is grounded through the second capacitor;

[0019] The common terminal of the second resistor and the second capacitor is connected to the control unit.

[0020] Optionally, the control unit is also configured to output a reminder signal when it is determined that the light-emitting part is not in the effective working position.

[0021] Optionally, the first light-emitting chips emit blue light, and the second light-emitting chips emit purple light.

[0022] Optionally, the preset value of the electrical parameter is: when the light source is turned on and the light-emitting part of the light source is in the effective working position, the electrical parameter detected by the tooth separation signal detection circuit when the second light-emitting chip is in the extinguishing gap.

[0023] A light source control method for a UV curing machine, applied to the control unit of the aforementioned UV curing machine, the light source control method comprising:

[0024] The electrical parameter detection value of the second light-emitting chip detected by the tooth separation signal detection circuit when the light source of the light curing machine is in the extinguishing gap after the tooth separation signal detection circuit is turned on;

[0025] Determine whether the detected electrical parameter value is less than the preset electrical parameter value;

[0026] If so, it is determined that the light-emitting part of the light source is not in an effective working position, and the light source is controlled to be turned off.

[0027] Optional, also includes:

[0028] When it is determined that the light-emitting part is not in the effective working position, a reminder signal is output.

[0029] Optional, also includes:

[0030] If not, then the light-emitting part is determined to be in the effective working position.

[0031] As can be seen from the above technical solution, this invention discloses a light curing machine and its light source control method. The light curing machine includes: a light source, a first driving circuit, a second driving circuit, a tooth separation signal detection circuit, and a control unit. The light source includes multiple first light-emitting chips and one second light-emitting chip. The first driving circuit drives the multiple first light-emitting chips to be constantly lit according to a first control signal output by the control unit. The second driving circuit drives the second light-emitting chip to periodically light up and off according to a second control signal output by the control unit. The control unit obtains the electrical parameter detection value of the second light-emitting chip when it is in the off-state interval, as detected by the tooth separation signal detection circuit. When it is determined that the electrical parameter detection value is less than the preset electrical parameter value, it is determined that the light-emitting part of the light source is not in an effective working position, and at this time, the light source is controlled to be turned off. This invention effectively avoids the light from the light-emitting part of the light source shining into the eyes of the patient or doctor when the light source is removed from the patient's mouth, thus preventing eye discomfort or damage. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the published drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a photocuring machine disclosed in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the power supply structure of a photocuring machine disclosed in an embodiment of the present invention;

[0035] Figure 3 This is a circuit diagram of a photocuring machine disclosed in an embodiment of the present invention;

[0036] Figure 4 This is a flowchart of a light source control method for a photocuring machine disclosed in an embodiment of the present invention;

[0037] Figure 5 This is a flowchart of another light source control method for a photocuring machine disclosed in an embodiment of the present invention. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] This invention discloses a light-curing machine and its light source control method. The light-curing machine includes a light source, a first driving circuit, a second driving circuit, a tooth separation signal detection circuit, and a control unit. The light source includes multiple first light-emitting chips and one second light-emitting chip. The first driving circuit drives the multiple first light-emitting chips to be constantly lit according to a first control signal output by the control unit. The second driving circuit drives the second light-emitting chip to periodically light up and off according to a second control signal output by the control unit. The control unit acquires the electrical parameter detection value of the second light-emitting chip when it is in an off-state interval, as detected by the tooth separation signal detection circuit. When the electrical parameter detection value is determined to be less than a preset electrical parameter value, it is determined that the light-emitting part of the light source is not in an effective working position, and the light source is controlled to be turned off. This invention effectively avoids the light from the light-emitting part of the light source shining into the eyes of the patient or doctor when the light source is removed from the patient's mouth, thus preventing eye discomfort or damage.

[0040] See Figure 1 The present invention discloses a schematic diagram of a light curing machine, which includes: a light source 11, a first driving circuit 12, a second driving circuit 13, a tooth separation signal detection circuit 14, and a control unit 15.

[0041] in:

[0042] The light source 11 includes: multiple first light-emitting chips and one second light-emitting chip, wherein the first light-emitting chips and the second light-emitting chip emit different colors.

[0043] In practical applications, the first light-emitting chip can emit blue light, and the second light-emitting chip can emit purple light.

[0044] For details, see Figure 2 The present invention discloses a schematic diagram of the power supply structure of a photocuring machine, wherein the light source 11 includes: a plurality of first light-emitting chips 1 ( Figure 2 (Taking three as an example for explanation) and a second light-emitting chip 2, multiple first light-emitting chips 1 and one second light-emitting chip 2 are all disposed on the substrate 3, constituting the light source 11 of the photocuring machine.

[0045] It should be noted that the positive terminals of multiple first light-emitting chips 1 are connected to the positive terminal of a second light-emitting chip 2. The mounting position of the second light-emitting chip 2 on the substrate 3 needs to ensure that the second light-emitting chip 2 is illuminated by the direct light emitted by the first light-emitting chip 1.

[0046] The first driving circuit 12 is connected to the control unit 15 and multiple first light-emitting chips 1 respectively, and is used to drive multiple first light-emitting chips 1 to stay lit according to the first control signal output by the control unit 15 after the light source 11 is turned on.

[0047] The second driving circuit 13 is connected to the control unit 15 and the second light-emitting chip 2 respectively, and is used to drive the second light-emitting chip 2 to periodically light up and turn off according to the second control signal output by the control unit 15 after the light source 11 is turned on.

[0048] In this embodiment, the second driving circuit 13 drives the second light-emitting chip 2 to periodically turn on and off by outputting pulse signals to the second light-emitting chip 2.

[0049] The duty cycle of the pulse signal output by the second driving circuit 13 to the second light-emitting chip 2 can be between 30% and 70%.

[0050] The tooth separation signal detection circuit 14 is connected to the power supply VCC of the light curing machine, the control unit 15, and the common terminal of the second light-emitting chip 2 and the second driving circuit 13, respectively. It is used to detect the electrical parameter detection value of the second light-emitting chip 2 when it is in the extinguishing gap after the light source 11 is turned on, and output the electrical parameter detection value to the control unit 15.

[0051] Among them, the electrical parameter detection value can be the voltage or current value of the second light-emitting chip 2 when it is in the extinguishing gap.

[0052] In practical applications, when using a light-curing machine to repair teeth, the light-emitting part of the light source 11 in the light-curing machine (i.e., the part where the light is emitted from the light-curing machine) will be in close contact with the teeth coated with light-curing resin. In this way, the light propagation distance can be shortened, the light attenuation and divergence can be reduced, and the curing efficiency of the light-curing resin can be improved.

[0053] In this embodiment, both the first and second light-emitting chips can be LED (Light-Emitting Diode) chips.

[0054] After the light source 11 is turned on, the first light-emitting chip 1 is constantly lit, while the second light-emitting chip 2 periodically turns on and off. When the light-emitting part of the light source 11 is in contact with or very close to the teeth, a portion of the light emitted by the first light-emitting chip 1 will be reflected by the teeth and / or the light-cured resin, and the reflected light will illuminate the second light-emitting chip 2.

[0055] Because LED light-emitting chips (first light-emitting chip 1 and second light-emitting chip 2) are semiconductors and exhibit the photovoltaic effect, a current is generated on the LED light-emitting chips when light (especially strong light) shines on them when they are off. To improve curing efficiency, the light curing machine uses a high-power light source, and correspondingly, the light intensity emitted by the light source is also very high, which makes the reflected blue light also have high energy.

[0056] When the first light-emitting chip 1 is constantly lit and the second light-emitting chip 2 is in the off interval, the second light-emitting chip 2 will generate electrical parameter detection values ​​under the direct light and reflected light of the first light-emitting chip 1. The electrical parameter detection values ​​can be voltage values ​​or current values.

[0057] In other words, the reflected light emitted by the first light-emitting chip 1 through the teeth and / or the light-cured resin, as well as some of the direct light emitted by the first light-emitting chip 1, will all shine on the second light-emitting chip 2, causing the second light-emitting chip 2 to generate electrical parameter detection values.

[0058] It should be noted that the substrate size of the light source 11 is relatively small, and the second light-emitting chip 2 is generally adjacent to the first light-emitting chip 1. Since the light emitted by the first light-emitting chip 1 has a certain illumination range, when the first light-emitting chip 1 is lit, some of the direct light emitted by the first light-emitting chip 1 will illuminate the second light-emitting chip 2. At the same time, some of the reflected light from the first light-emitting chip 1 will also illuminate the second light-emitting chip 2. This invention turns off the power supply 11 when it is determined that the light-emitting part of the light source is not in an effective working position, so that the second light-emitting chip 2 will generate electrical parameter detection values ​​under the illumination of the direct light and reflected light of the first light-emitting chip 1.

[0059] The control unit 15 is used to determine whether the electrical parameter detection value of the second light-emitting chip 2 is less than the preset electrical parameter value when it is in the extinguishing gap. If so, it determines that the light-emitting part of the light source 11 is not in an effective working position and controls the light source 11 to turn off.

[0060] In this embodiment, the effective working position refers to the position where the light-emitting part of the light source 11 is in contact with the tooth, or the position where the distance between the light-emitting part and the tooth is less than the distance threshold. The value of the distance threshold is determined according to actual needs, such as 3cm.

[0061] The preset values ​​for the electrical parameters are: when the light source 11 is turned on and the light-emitting part of the light source 11 is in an effective working position, the electrical parameters of the second light-emitting chip 2 detected by the tooth separation signal detection circuit 14 when it is in the extinguishing gap.

[0062] Understandably, when the light-emitting part is not close to or in contact with other obstructions (lips, oral mucosa), the farther the light-emitting part is from the teeth or the light-emitting part is misaligned, the weaker the reflected light of the first light-emitting chip 1 will be. When the distance between the light-emitting part and the teeth exceeds the distance threshold, the reflected light can be ignored. At this time, only part of the direct light emitted by the first light-emitting chip 1 illuminates the second light-emitting chip 2.

[0063] Specifically, when the second light-emitting chip 2 is in the extinguishing gap, the detected electrical parameter value is current I1, and the preset electrical parameter value is current I2. If I1 < I2, it is determined that the light-emitting part of the light source 11 is not in an effective working position. At this time, the light source 11 is controlled to be turned off to prevent the light from the light-emitting part from shining into the eyes of the patient or doctor when the light source is removed from the patient's mouth, causing eye discomfort or damage.

[0064] When the second light-emitting chip 2 is in the extinguishing gap, the detected electrical parameter value is voltage U1, and the preset electrical parameter value is voltage U2. If U1 < U2, it is determined that the light-emitting part of the light source 11 is not in an effective working position. At this time, the light source 11 is controlled to be turned off to prevent the light from the light-emitting part from shining into the eyes of the patient or doctor when the light source 11 is removed from the patient's mouth, causing eye discomfort or damage.

[0065] In summary, this invention discloses a light-curing machine, comprising: a light source 11, a first driving circuit 12, a second driving circuit 13, a tooth separation signal detection circuit 14, and a control unit 15. The light source 11 includes multiple first light-emitting chips and one second light-emitting chip. The first driving circuit 12 drives the multiple first light-emitting chips 1 to be constantly lit according to a first control signal output by the control unit 15. The second driving circuit 13 drives the second light-emitting chip 2 to periodically light up and off according to a second control signal output by the control unit 15. The control unit 15 acquires the electrical parameter detection value of the second light-emitting chip 2 when it is in the off-state interval, as detected by the tooth separation signal detection circuit 14. When the electrical parameter detection value is determined to be less than a preset electrical parameter value, it is determined that the light-emitting part of the light source 11 is not in an effective working position, and at this time, the light source 11 is controlled to be turned off. This invention effectively avoids the light from the light-emitting part of the light source 11 shining into the eyes of the patient or doctor when the light source 11 is removed from the patient's mouth, thus preventing eye discomfort or damage.

[0066] To further optimize the above embodiments, the control unit 15 is also used for:

[0067] When it is determined that the light output unit is not in a valid working position, an alert signal is output.

[0068] In summary, the light-curing machine disclosed in this invention, when the control unit 15 determines that the electrical parameter detection value of the second light-emitting chip 2 during the extinguishing gap is less than the preset electrical parameter value, will determine that the light-emitting part of the light source 11 is not in an effective working position. At this time, by controlling the light source 11 to turn off, it effectively avoids the light from the light-emitting part of the light source 11 shining into the eyes of the patient or doctor when the light source 11 is removed from the patient's mouth, thus preventing eye discomfort or damage. At the same time, the control unit 15 will also output a reminder signal to remind the dentist.

[0069] It should be noted that in practical applications, when using a light-curing machine to repair teeth, if the light source 11 is lit outside the patient's mouth, the light-emitting part can be controlled to face the ground or other positions to avoid the light shining into the eyes of the patient or doctor.

[0070] In this embodiment, when the second light-emitting chip 2 is lit, it is powered by the power supply of the photocuring machine. At this time, the current value passing through the second light-emitting chip 2 and the voltage value across the second light-emitting chip 2 can be regarded as constant values.

[0071] To further optimize the above embodiments, the control unit 15 can also be used for:

[0072] When the electrical parameter detection value of the second light-emitting chip 2 during the extinguishing gap is not less than the preset electrical parameter value, it is determined that the light-emitting part of the light source 11 is in an effective working position, and the working state of the light source 11 is maintained unchanged.

[0073] To further optimize the above embodiments, see [link to relevant documentation]. Figure 3 The present invention discloses a circuit diagram of a light curing machine, which includes: a light source 11, a first driving circuit 12, a second driving circuit 13, a tooth separation signal detection circuit 14, and a control unit 15.

[0074] The tooth separation signal detection circuit 14 includes: a first filter circuit, an amplifier U01, and a second filter circuit.

[0075] The input terminals (IN1+ and IN1-) of the amplifier U01 are connected to the power supply VCC of the photocuring machine and the common terminal of the second light-emitting chip 2 and the second driving circuit 13 respectively through the first filter circuit.

[0076] The output terminal OUT1 of the amplifier U01 is connected to the control unit 15 through the second filter circuit.

[0077] The first filter circuit is used to filter the electrical parameter detection value of the second light-emitting chip 2 when it is in the off gap, which is detected at the input terminal of amplifier U01.

[0078] The second filtering circuit is used to filter the electrical parameter detection values ​​output from the output terminal OUT1 of amplifier U01 to control unit 15.

[0079] The power supply voltage for amplifier U01 can be 3V.

[0080] In summary, the tooth removal signal detection circuit 14 of this invention detects the electrical parameters of the second light-emitting chip 2 during its off-state gap and outputs these values ​​to the control unit 15. When the control unit 15 determines that the electrical parameter detection value is less than a preset value, it determines that the light-emitting part of the light source 11 is not in an effective working position, and at this time, the control unit 15 controls the light source 11 to turn off. This invention effectively prevents the light from the light-emitting part of the light source 11 from shining into the eyes of the patient or doctor when the light source 11 is removed from the patient's mouth, thus avoiding eye discomfort or damage.

[0081] To further optimize the above embodiments, the first filter circuit may include: a first resistor R01 and a first capacitor C01.

[0082] The first resistor R01 is connected to the positive input terminal IN1+ and the negative input terminal IN1- of the amplifier U01, respectively.

[0083] The first capacitor C01 is connected to the positive input terminal IN1+ and the negative input terminal IN1- of the amplifier U01, respectively.

[0084] To further optimize the above embodiments, the second filter circuit may include: a second resistor R02 and a second capacitor C02.

[0085] One end of the second resistor R02 is connected to the output terminal of the amplifier U01, and the other end of the second resistor R02 is grounded through the second capacitor C02.

[0086] The common terminal of the second resistor R02 and the second capacitor C02 is connected to the control unit 15.

[0087] Corresponding to the above embodiments, the present invention also discloses a light source control method for a photocuring machine.

[0088] See Figure 4 The present invention discloses a flowchart of a light source control method for a photocuring machine. This method is applied to the control unit in the aforementioned photocuring machine and includes:

[0089] Step S101: Obtain the electrical parameter detection value of the second light-emitting chip detected by the tooth separation signal detection circuit when it is in the extinguishing gap after the light source of the light curing machine is turned on.

[0090] Among them, the electrical parameter detection value can be the voltage or current value of the second light-emitting chip when it is in the extinguishing gap.

[0091] Step S102: Determine whether the detected electrical parameter value is less than the preset electrical parameter value. If so, proceed to step S103.

[0092] Step S103: Determine that the light-emitting part of the light source is not in an effective working position, and control the light source to be turned off.

[0093] In this embodiment, the effective working position refers to the position where the light-emitting part of the light source is in contact with the tooth, or the position where the distance between the light-emitting part and the tooth is less than the distance threshold. The value of the distance threshold is determined according to actual needs, such as 3cm.

[0094] The preset electrical parameter values ​​are: when the light source is turned on and the light-emitting part of the light source is in an effective working position, the electrical parameters of the second light-emitting chip detected by the tooth separation signal detection circuit are in the extinguishing gap.

[0095] In summary, the light source control method for a light-curing machine disclosed in this invention involves the control unit acquiring the electrical parameter detection value of the second light-emitting chip detected by the tooth separation signal detection circuit when the light source of the light-curing machine is in the off-state gap. When it is determined that the electrical parameter detection value is less than the preset electrical parameter value, it is determined that the light-emitting part of the light source is not in an effective working position, and at this time, the light source is controlled to be turned off. By turning off the power supply 11 when it is determined that the light-emitting part of the light source is not in an effective working position, this invention effectively avoids the light from the light-emitting part shining into the eyes of the patient or doctor when the light source is removed from the patient's mouth, thus preventing eye discomfort or damage.

[0096] To further optimize the above embodiments, see [link to relevant documentation]. Figure 5 The flowchart of another light source control method for a photocuring machine disclosed in this embodiment of the invention is as follows: Figure 4 Based on the embodiment shown, after determining in step S103 that the light-emitting unit is not in an effective working position, the control method may further include:

[0097] Step S104: Output a reminder signal.

[0098] In summary, the light-curing machine disclosed in this invention, when the control unit determines that the electrical parameter detection value of the second light-emitting chip during the extinguishing gap is less than the preset electrical parameter value, will determine that the light-emitting part of the light source is not in an effective working position. At this time, by controlling the light source to turn off, it effectively avoids the light from the light-emitting part shining into the eyes of the patient or doctor when the light source is removed from the patient's mouth, thus preventing eye discomfort or damage. At the same time, the control unit will also output a reminder signal to remind the dentist.

[0099] To further optimize the above embodiments, when step S102 determines that it is not true, the control method may further include:

[0100] Step S105: Determine that the light output unit is in an effective working position.

[0101] In this embodiment, when the control unit determines that the electrical parameter detection value of the second light-emitting chip during the extinguishing gap is not less than the preset electrical parameter value, it determines that the light-emitting part of the light source is in an effective working position, and at this time the working state of the light source remains unchanged.

[0102] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion. The present invention, by turning off the power when the light-emitting portion of the light source is not in an effective operating position, ensures that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0103] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0104] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A photocuring machine, characterized in that, include: The system includes a light source, a first driving circuit, a second driving circuit, a tooth separation signal detection circuit, and a control unit. The light source includes: a plurality of first light-emitting chips and a second light-emitting chip, wherein the first light-emitting chips and the second light-emitting chip emit different colors; The first driving circuit is connected to the control unit and the plurality of first light-emitting chips respectively, and is used to drive the plurality of first light-emitting chips to remain lit according to the first control signal output by the control unit after the light source is turned on; The second driving circuit is connected to the control unit and the second light-emitting chip respectively, and is used to drive the second light-emitting chip to periodically turn on and off according to the second control signal output by the control unit after the light source is turned on; The tooth detachment signal detection circuit is connected to the power supply of the light curing machine, the control unit, and the common terminal of the second light-emitting chip and the second driving circuit. It is used to detect the electrical parameter values ​​of the second light-emitting chip during its off-state interval after the light source is activated, and output the electrical parameter values ​​to the control unit. The tooth detachment signal detection circuit includes a first filter circuit, an amplifier, and a second filter circuit. The input terminal of the amplifier is connected to the power supply of the light curing machine and the common terminal of the second light-emitting chip and the second driving circuit through the first filter circuit. The output terminal of the amplifier is connected to the control unit through the second filter circuit. The control unit is used to determine whether the detected electrical parameter value is less than the preset electrical parameter value. If so, it determines that the light-emitting part of the light source is not in an effective working position and controls the light source to be turned off.

2. The photocuring machine according to claim 1, characterized in that, The first filter circuit includes: a first resistor and a first capacitor; The first resistor is connected to both the positive and negative input terminals of the amplifier. The first capacitor is connected to the positive input terminal and the negative input terminal of the amplifier, respectively.

3. The photocuring machine according to claim 1, characterized in that, The second filter circuit includes: a second resistor and a second capacitor; One end of the second resistor is connected to the output terminal of the amplifier, and the other end of the second resistor is grounded through the second capacitor; The common terminal of the second resistor and the second capacitor is connected to the control unit.

4. The photocuring machine according to claim 1, characterized in that, The control unit is also configured to output a reminder signal when it is determined that the light-emitting part is not in the effective working position.

5. The photocuring machine according to claim 1, characterized in that, The first light-emitting chip emits blue light, and the second light-emitting chip emits purple light.

6. The photocuring machine according to claim 1, characterized in that, The preset value of the electrical parameter is: when the light source is turned on and the light-emitting part of the light source is in the effective working position, the electrical parameter detected by the tooth separation signal detection circuit when the second light-emitting chip is in the extinguishing gap.

7. A method for controlling the light source of a photocuring machine, characterized in that, The control unit applied in the photocuring machine according to any one of claims 1 to 6, wherein the light source control method includes: The electrical parameter detection value of the second light-emitting chip detected by the tooth separation signal detection circuit when the light source of the light curing machine is in the extinguishing gap after the tooth separation signal detection circuit is turned on; Determine whether the detected electrical parameter value is less than the preset electrical parameter value; If so, it is determined that the light-emitting part of the light source is not in an effective working position, and the light source is controlled to be turned off.

8. The light source control method according to claim 7, characterized in that, Also includes: When it is determined that the light-emitting part is not in the effective working position, a reminder signal is output.

9. The light source control method according to claim 7, characterized in that, Also includes: If not, then the light-emitting part is determined to be in the effective working position.

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