Method for controlling light spot size of blue light module

Abstract

The invention relates to the technical field of laser, and discloses a method for controlling the light spot size of a blue light module, the control method relates to the blue light module, the blue light module comprises at least two light sources and a focus lens, the multiple light sources enter the focus lens in a mutually parallel mode, and a light spot is formed at the focus point through the focus lens; the light spots are formed by light spots formed by the light sources at focus positions; at least two light spots in the plurality of light spots partially coincide and do not completely coincide; according to the control method, the sizes of the light spots are controlled by controlling the number of the turned-on light sources, the multiple light sources are focused in an incomplete overlapping mode, the sizes of the light spots are controlled by controlling on-off of different light spots, and the sizes of the light spots are adjusted according to the actual situation so as to achieve the optimal effect.

Description

Technical Field

[0001] The invention relates to the field of laser technology, and in particular to a method for controlling the light spot size of a blue light module. Background Art

[0002] In laser application scenarios, laser can be used for marking and engraving. The light spot formed by the optical fiber is related to marking and engraving. Specifically, when the light spot is large, the marked and engraved patterns will be blurred, especially at the edges. When the light spot is small, the marked and engraved patterns will be clearer. However, the spot size cannot be achieved by adjusting the laser power at present, because the adjustment of the laser power is achieved by controlling the on and off time of the laser within a certain period of time. This results in the spot size remaining unchanged regardless of whether the laser power is large or small.

[0003] In the prior art, an invention patent (CN111562713A) discloses a laser projection device, in which a laser component used emits a first color laser beam, a second color laser beam and a third color laser beam, and the angles of the spot beams of the above three color laser beams are different; the light combining lens group includes at least a third light combining lens, the first color laser beam and the second color laser beam are incident on the first surface of the third light combining lens and are transmitted through, and the first surface has a convex microstructure; the third color laser beam is incident on the second surface of the third light combining lens and is reflected toward the light source outlet, and the beam angles of the first color laser beam and the second color laser beam transmitted through the first surface of the third light combining lens are increased, and the device cannot control the spot size by adjusting the laser power.

[0004] Based on this, the technical problem to be solved in this case is: how to adjust the size of the light spot according to the laser power. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a method for controlling the light spot size of a blue light module. The control method focuses multiple light sources in an incompletely overlapping manner, and controls the size of the light spot by controlling the on and off of different light spots. The size of the light spot is challenged according to actual conditions to achieve the best effect. Specifically, incomplete overlap of multiple light spots can make it more convenient for staff to focus and control the size of the light spot. When multiple light spots do not overlap at all, it is inconvenient for staff to focus; when multiple light spots completely overlap, the size of the light spot cannot be controlled.

[0006] The technical solution of the present invention is:

[0007] A method for controlling the light spot size of a blue light module, the method relates to a blue light module, the blue light module comprises a light source group consisting of at least two light sources and a focusing lens, characterized in that light beams emitted by the light sources of the light source group are incident on the focusing lens in a mutually parallel manner, and form a light spot at the focus through the focusing lens; the light spot is composed of light spots formed by the light beams at the focus position; at least two light spots in the light spot partially overlap, and do not completely overlap;

[0008] The method is: control the size of the light spot by controlling the number of light sources turned on.

[0009] Preferably, multiple light spots overlap in the same area.

[0010] Preferably, the light spot is elliptical, and the major axis of the light spot is 0.12-0.16 mm, more preferably, the major axis of the light spot can be selected as 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm; the minor axis of the light spot is 0.04-0.06 mm, more preferably, the minor axis of the light spot can be selected as 0.04 mm, 0.05 mm, 0.06 mm; preferably, the length of the light spot is 0.15-0.18 mm, more preferably, the length of the light spot can be selected as 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm; the width of the light spot is 0.08-0.12 mm, more preferably, the width of the light spot can be selected as 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm.

[0011] In the above-mentioned method for controlling the spot size of a blue light module, the number of light sources in the light source group is at least 2. Preferably, the number of light sources can be 2, 3, 4, 5, or 6. More preferably, the number of light sources can be 4.

[0012] In the above-mentioned method for controlling the spot size of a blue light module, the method for controlling the spot size of a blue light module further includes a control module, the multiple light sources are electrically connected to the control module, and the control module controls the on and off of the multiple light sources through a PWM signal.

[0013] In the above-mentioned method for controlling the spot size of a blue light module, the method for controlling the spot size of a blue light module further includes an incident module, and the incident module is used to inject multiple light sources into the focusing lens in a mutually parallel manner.

[0014] In the above-mentioned method for controlling the spot size of a blue light module, the incident module further includes at least one collimating lens, and the collimating lens is used to direct the multiple light sources into the focusing lens in a parallel and direct manner.

[0015] In the above-mentioned method for controlling the spot size of a blue light module, there are multiple collimating lenses, which match the number of light sources, and the collimating lenses are used to direct the corresponding light sources into the focusing lens in a parallel and direct manner.

[0016] In the above-mentioned method for controlling the spot size of a blue light module, the incident module also includes multiple reflectors, the number of reflectors matches that of the collimating lenses, and they correspond one to one. After the light source enters the collimating lens, it passes through the reflector and enters the focusing lens. The reflector is used to direct the multiple light sources into the focusing lens in a mutually parallel manner.

[0017] In the above-mentioned method for controlling the spot size of a blue light module, the angles between the collimating lens and the reflector in the incident module are the same.

[0018] One of the above technical solutions of the present invention has at least one of the following advantages or beneficial effects:

[0019] The present invention focuses multiple light sources in a non-completely overlapping manner and controls the size of the light spot by controlling the on and off of different light spots. The size of the light spot is challenged according to actual conditions to achieve the best effect. Specifically, when the multiple light spots do not completely overlap, it is more convenient for the staff to focus and control the size of the light spot. When the multiple light spots do not overlap at all, it is inconvenient for the staff to focus; when the multiple light spots completely overlap, the size of the light spot cannot be controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a light path diagram of Embodiment 1 of the present invention;

[0021] Figure 2 This is a schematic diagram of turning on four light sources in Example 2 of the present invention;

[0022] Figure 3 This is a schematic diagram of turning on three light sources in Example 2 of the present invention;

[0023] Figure 4 This is a schematic diagram of turning on two light sources in Example 2 of the present invention;

[0024] Figure 5 This is a schematic diagram of turning on one light source in Example 2 of the present invention;

[0025] Figure 6 This is a schematic diagram of turning on 6 light sources in Example 3 of the present invention;

[0026] Figure 7 This is a schematic diagram of turning on five light sources in Example 3 of the present invention;

[0027] Figure 8 This is a schematic diagram of turning on four light sources in Example 3 of the present invention;

[0028] Fig. 9 This is a schematic diagram of turning on three light sources in Example 3 of the present invention;

[0029] Fig.10This is a schematic diagram of turning on two light sources in Example 3 of the present invention;

[0030] Fig.11 This is a schematic diagram of turning on three light sources in Example 4 of the present invention;

[0031] Fig.12 This is a schematic diagram of turning on two light sources according to Embodiment 4 of the present invention.

[0032] Among them, the specific reference numerals of each figure are as follows: 1, light source; 2, focusing mirror; 3, light spot; 4, incident module; 5, light point; 41, collimating lens; 42, reflecting mirror; Y, overlapping area. DETAILED DESCRIPTION

[0033] 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.

[0034] Example 1

[0035] First, the device to which the method of the present invention is applicable is described. Specifically, a blue light module includes a laser diode for emitting a light source, a collimating lens for directly irradiating the light source, a reflector for reflecting the light source, and a focusing mirror for focusing the light source. The components of the blue light module of this embodiment adopt the following specifications as examples: the wavelength of the laser diode is 450nm; the collimating lens adopts a plano-convex lens; the reflector adopts a plano-convex reflector; the focusing mirror adopts a plano-convex focusing mirror, and the focal length is 12mm, and the working wavelength is 450nm. Specifically, the working wavelength of the focusing mirror must be equal to the wavelength of the laser diode.

[0036] See also Figure 1 A blue light module comprises a light source group consisting of at least two light sources 1 and a focusing lens 2. Light beams emitted by the light sources 1 of the light source group are incident on the focusing lens 2 in a mutually parallel manner, and form a light spot 3 at the focus through the focusing lens 2; the light spot 3 is composed of light spots 5 formed by the light sources 1 at the focus position; the light spots 3 at least partially overlap, and do not completely overlap.

[0037] In actual applications, the staff injects multiple light sources 1 into the focusing mirror 2 in parallel, and the focusing mirror 2 is a spherical mirror. Under the influence of spherical aberration, each light source 1 cannot completely overlap at a focus, and the light spots 5 formed by each light source 1 at least partially overlap, but not completely overlap. In particular, if an aspherical mirror is used to eliminate spherical aberration, points can be taken before and after the focus of the focusing mirror 2, and a light spot 3 is formed by partially overlapping each light spot 5. Specifically, when it is necessary to increase the size of the light spot 3, more light sources 1 are introduced, and the light source 1 is also injected into the focusing mirror 2 in a manner parallel to the light source 1 that has been introduced, and does not completely overlap with the light spot 5 that has been formed; when it is necessary to reduce the size of the light spot 3, the light source 1 that has been introduced is reduced. At this time, the light spots 5 on the light spot 3 are reduced as the light source 1 is disconnected, thereby reducing the size of the light spot 3. Specifically, through this control method, it is beneficial to control the size of the light spot 3 for different application places. It should be noted that in this embodiment, the light source 1 is emitted by a laser diode, and the wavelength of the light source 1 is 450nm.

[0038] Preferably, the light spot 5 is elliptical, the major axis of the light spot 5 is 0.12-0.16 mm, and the minor axis of the light spot 5 is 0.04-0.06 mm; the length of the light spot 3 is 0.15-0.18 mm, and the width of the light spot 3 is 0.08-0.12 mm.

[0039] In this embodiment, the shape of the light spot 5 is elliptical, and the size of the light spot 5 is related to the selection of the lens. Therefore, the size of the light spot 5 has a floating range. Specifically, the major axis of the light spot 5 can be selected as 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, and the minor axis of the light spot 5 can be selected as 0.04mm, 0.05mm, 0.06mm, while the size of the light spot 3 is related to the size of the light spot 5. Therefore, the size of the light spot 3 is related to the size of the light spot 5. Specifically, the length of the light spot 3 is the distance from the highest point to the lowest point of the overlapping light spot 5. Preferably, the length of the light spot 3 can be selected as 0.15mm, 0.16mm, 0.17mm, 0.18mm; the width of the light spot 3 is the distance from one side to the other side of the overlapping light spot 5. Preferably, the width of the light spot 3 can be selected as 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm.

[0040] More preferably, the plurality of light spots 5 overlap in the same area.

[0041] In practical applications, multiple light spots 5 will overlap in the same area to ensure energy concentration. The more dispersed the multiple light spots 5 are, the more dispersed the energy is. Therefore, the larger the area of ​​the overlapping area, the higher the energy density. However, they cannot completely overlap. Therefore, the overlap of multiple light spots 5 in the same area is conducive to ensuring energy concentration.

[0042] More preferably, the number of the light sources 1 in the light source group is at least two.

[0043] In this embodiment, the number of light sources 1 used is 3 to 6, but is not limited to 3 to 6. The number of light sources 1 can be increased or decreased according to actual work needs. The staff can adjust the number of light sources 1 by themselves, which is conducive to the staff to adjust according to actual conditions.

[0044] More preferably, the method for controlling the light spot size of the blue light module further comprises a control module, and the plurality of light sources 1 are electrically connected to the control module, and the control module controls the on and off of the plurality of light sources 1 through a PWM signal.

[0045] Through the above design, the control module can also control the on and off of multiple light sources 1, that is to say, the size of the light spot 3 can be controlled by the control module. Specifically, the on and off number of light sources 1 is controlled by controlling the duty cycle of the PWM signal. For example, when 4 light sources 1 are turned on, when the duty cycle of the PWM signal is 100%, the number of light sources 1 turned on is 4; when the duty cycle of the PWM signal is 75%, the number of light sources 1 turned on is 3; when the duty cycle of the PWM signal is 50%, the number of light sources 1 turned on is 2; when the duty cycle of the PWM signal is 25%, the number of light sources 1 turned on is 1; when the duty cycle of the PWM signal is 0%, the number of light sources 1 turned on is 0. Controlling the on and off of the light sources 1 in this way is beneficial to the operation of the staff, and is convenient for the staff to adjust according to the actual number of light sources 1. It should be noted that the control module is not shown in the figure.

[0046] Furthermore, the method for controlling the light spot size of the blue light module further comprises an incident module 4, and the incident module 4 is used to inject the plurality of light sources 1 into the focusing lens 2 in a mutually parallel manner.

[0047] In the above design, the incident module 4 ensures that multiple light sources 1 can be incident on the focusing lens 2 in a mutually parallel manner, so that under the action of the focusing lens 2, multiple light spots 5 form a light spot 3 in an incompletely overlapping manner, which is beneficial for the staff to focus and adjust the size of the light spot 3.

[0048] Preferably, the incident module 4 further includes at least one collimating lens 41 , and the collimating lens 41 is used to direct the plurality of light sources 1 into the focusing lens 2 in a parallel and direct manner.

[0049] Through the above design, the light source 1 can be concentrated and emitted in parallel after entering the collimating lens 41, which can ensure that multiple light sources 1 can be input into the focusing lens 2 in a parallel manner, thereby facilitating the staff to focus and adjust the size of the light spot 3.

[0050] More preferably, there are multiple collimating lenses 41 , and the number matches the number of light sources 1 , and the collimating lenses 41 are used to direct the corresponding light sources 1 into the focusing lens 2 in a parallel and direct manner.

[0051] In this embodiment, the number of collimating lenses 41 matches the number of light sources 1, which can further ensure that each light source 1 can be incident on the focusing lens 2 at the same direct angle, that is, in a parallel manner, thereby making it easier for the staff to adjust the position of the collimating lens 41 according to the single light source 1.

[0052] More preferably, the incident module 4 also includes a plurality of reflectors 42, the reflectors 42 match the number of the collimating lenses 41 and correspond one to one, and after the light source 1 enters the collimating lens 41, it passes through the reflector 42 and enters the focusing lens 2, and the reflector 42 is used to direct the plurality of light sources 1 into the focusing lens 2 in a mutually parallel manner.

[0053] Through the above design, the light source 1 is emitted in a parallel manner after entering the collimating lens 41, and then enters the reflector 42, and is reflected to the focusing lens 2 by the reflector 42. In this way, the staff can adjust the angle of the reflector 42 to adjust the incident angle of a single light source 1 entering the focusing lens 2, thereby further ensuring that the light source 1 can enter the focusing lens 2 in a parallel manner and form a light spot 3 through the focusing lens 2, which is beneficial for the staff to adjust the incident angle of each light source 1 entering the focusing lens 2.

[0054] More preferably, the included angles between the collimating lens 41 and the reflecting mirror 42 in the incident module 4 are the same.

[0055] In this embodiment, the included angles between the collimating lens 41 and the reflecting mirror 42 are the same, which can ensure that the light source 1 passes through the incident module 4 and enters the focusing mirror 2 in a parallel manner after being emitted.

[0056] Example 2

[0057] See also Figures 2 to 5 , a method for controlling the size of a blue light module spot 3, using the module described in Example 1;

[0058] Specifically, the module includes four light sources 1 and a focusing lens 2. The four light sources 1 are incident on the focusing lens 2 in a mutually parallel manner, and form a light spot 3 at the focus through the focusing lens 2; the light spot 3 is composed of light spots 5 formed at the focus position of each light source 1; the four light spots 5 at least partially overlap, but not completely overlap;

[0059] The light spot 5 is elliptical, the major axis of the light spot 5 is 0.14 mm, and the minor axis of the light spot 5 is 0.05 mm; the length of the light spot 3 is 0.16 mm, and the width of the light spot 3 is 0.10 mm;

[0060] When all four light sources 1 are turned on, the relationship between the light spot 3 and the light spot 5 in this embodiment can be seen. Figure 2 ; Multiple light spots 5 have overlapping area Y;

[0061] When one light source 1 is turned off, the turned off light source 1 may be any one of the four light sources 1, and the relationship between the light spot 3 and the light spot 5 in this embodiment can be seen. Figure 3 ; Multiple light spots 5 have overlapping area Y;

[0062] When two light sources 1 are turned off, the turned off light sources 1 may be any two light sources 1 among the four light sources 1, and the relationship between the light spot 3 and the light spot 5 in this embodiment can be seen. Figure 4 ; There is an overlapping area Y between the two light spots 5;

[0063] When three light sources 1 are turned off, the turned-off light sources 1 may be any three light sources 1 among the four light sources 1, and the light spot 3 of this embodiment is the light spot 5 formed by the turned-on light sources 1. Figure 5 .

[0064] Example 3

[0065] See also Figures 6 to 10 , a method for controlling the size of a blue light module spot 3, using the module described in Example 1;

[0066] Specifically, the module includes 6 light sources 1 and a focusing lens 2. The 6 light sources 1 are incident on the focusing lens 2 in a mutually parallel manner, and form a light spot 3 at the focus through the focusing lens 2; the light spot 3 is composed of light spots 5 formed at the focus position of each light source 1; the 6 light spots 5 at least partially overlap, but not completely overlap;

[0067] The light spot 5 is elliptical, the major axis of the light spot 5 is 0.16 mm, and the minor axis of the light spot 5 is 0.04 mm; the length of the light spot 3 is 0.17 mm, and the width of the light spot 3 is 0.08 mm;

[0068] When all six light sources 1 are turned on, the relationship between the light spot 3 and the light spot 5 in this embodiment can be seen. Figure 6 ; It can be seen that the six light spots 5 have a common overlapping area Y;

[0069] When one light source 1 is turned off, the turned off light source 1 may be any one of the six light sources 1, and the relationship between the light spot 3 and the light spot 5 in this embodiment can be seen. Figure 7 , multiple light spots 5 have overlapping area Y;

[0070] When two light sources 1 are turned off, the turned off light sources 1 may be any two light sources 1 among the six light sources 1, and the relationship between the light spot 3 and the light spot 5 in this embodiment can be seen. Figure 8 , multiple light spots 5 have overlapping area Y;

[0071] When three light sources 1 are turned off, the turned off light sources 1 may be any three light sources 1 among the six light sources 1, and the relationship between the light spot 3 and the light spot 5 in this embodiment can be seen. Fig. 9 , multiple light spots 5 have overlapping area Y;

[0072] When four light sources 1 are turned off, the turned off light sources 1 may be any four light sources 1 among the six light sources 1, and the relationship between the light spot 3 and the light spot 5 in this embodiment can be seen. Fig.10 , there is an overlapping area Y between the two light spots 5;

[0073] When five light sources 1 are turned off, the turned-off light sources 1 may be any five light sources 1 among the six light sources 1 , and the light spot 3 in this embodiment is the light spot 5 formed by the turned-on light sources 1 .

[0074] Example 4

[0075] See also Figures 11-12 , a method for controlling the size of a blue light module spot 3, using the module described in Example 1;

[0076] Specifically, the module includes three light sources 1 and a focusing lens 2. The three light sources 1 are incident on the focusing lens 2 in a mutually parallel manner, and form a light spot 3 at the focus through the focusing lens 2; the light spot 3 is composed of light spots 5 formed at the focus position of each light source 1; the three light spots 5 at least partially overlap, but not completely overlap;

[0077] The light spot 5 is elliptical, the major axis of the light spot 5 is 0.12 mm, and the minor axis of the light spot 5 is 0.06 mm; the length of the light spot 3 is 0.18 mm, and the width of the light spot 3 is 0.09 mm;

[0078] When all three light sources 1 are turned on, the relationship between the light spot 3 and the light spot 5 in this embodiment can be seen. Fig.11 ; It can be seen that there are areas where the three light spots 5 overlap with each other;

[0079] When one light source 1 is turned off, the turned off light source 1 may be any one of the three light sources 1, and the relationship between the light spot 3 and the light spot 5 in this embodiment can be seen. Fig.12 , there is an overlapping area Y between the two light spots 5;

[0080] When two light sources 1 are turned off, the turned-off light sources 1 may be any two light sources 1 among the three light sources 1 , and the light spot 3 in this embodiment is the light spot 5 formed by the turned-on light sources 1 .

[0081] Result analysis:

[0082] 1. According to Example 2, when four light sources 1 are introduced, the maximum light spot 3 is obtained as Figure 2 As shown, in particular, the four light spots 5 can be focused by the staff to adjust the area of ​​the overlapping area Y of the four light sources 1. Specifically, when the light spot 3 is required to be larger than Figure 2 When the maximum light spot 3 is adjusted, the light spot 3 needs to be reduced. The coverage area of ​​the light spot 3 can be reduced by reducing the number of light sources 1 at the beginning. Figure 2 , Figure 3 , Figure 4 , Figure 5 It is knowable.

[0083] 2. According to Example 2 and Example 3, when the number of light sources 1 is increased, the maximum coverage area of ​​the light spot 3 increases, and the size of the light spot 3 can be more finely controlled. Specifically, the center position of the overlapping area Y remains unchanged, which can ensure that even if the coverage area of ​​the light spot 3 is reduced, the position where the energy is concentrated remains unchanged. Therefore, the more light sources 1 are introduced, the finer the control of the size of the light spot 3 is, and the position where the energy is concentrated remains unchanged.

[0084] 3. According to Embodiment 2 and Embodiment 4, when the light spots 5 are formed in different overlapping ways, the positions where the energy is concentrated are also different. When the light spots 5 are formed by overlapping in pairs to form a light spot 3, the energy will be dispersed, and the coverage area of ​​the light spot 3 is wider. When the number of light sources 1 turned on is reduced, the coverage area of ​​the light spot 3 changes greatly, which is not easy to control, and the energy is dispersed. In summary, the most preferred overlapping scheme of multiple light spots 5 is as follows: Figures 2 to 4 As shown, it is convenient for the staff to control the coverage area of ​​the light spot 3 and to concentrate the energy output, which is convenient for application in the fields of laser marking, laser engraving, etc.

[0085] In summary, the staff can control the size of the light spot 3 by controlling the number of light sources 1 introduced, wherein, when the number of light sources 1 introduced is greater, the control of the size of the light spot 3 is more precise, and the maximum coverage area of ​​the light spot 3 is also larger. On the other hand, by adjusting the overlap of the light spots 5, the light spots 5 can overlap in an energy-concentrated manner, as shown in the following example. Figures 2 to 10 As shown, the energy can be output in a concentrated manner in the overlapping area Y while the size of the light spot 3 is controlled. However, when the light spots 5 overlap in pairs, the size of the light spot 3 varies greatly, and the energy is output in a dispersed manner, which is not practical.

[0086] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for controlling the spot size of a blue light module, the method relates to a blue light module, the blue light module comprises a light source group consisting of at least two light sources and a focusing lens, characterized in that: The light beams emitted by the light sources of the light source group are incident on the focusing lens in a mutually parallel manner, and form a light spot at the focus through the focusing lens; the light spot is composed of light spots formed by the light beams at the focus position; at least two light spots in the light spot partially overlap, but do not completely overlap; The method comprises: controlling the size of the light spot by controlling the number of the light sources turned on.

2. The method for controlling the light spot size of a blue light module according to claim 1, characterized in that: The plurality of light spots overlap in the same area.

3. The method for controlling the light spot size of a blue light module according to claim 1, characterized in that: The light spot is elliptical, the major axis of the light spot is 0.12-0.16 mm, and the minor axis of the light spot is 0.04-0.06 mm; the length of the light spot is 0.15-0.18 mm, and the width of the light spot is 0.08-0.12 mm.

4. The method for controlling the light spot size of a blue light module according to claim 1, characterized in that: The number of light sources in the light source group is at least 2.

5. A method for controlling the light spot size of a blue light module according to claim 4, characterized in that: The method for controlling the light spot size of the blue light module further includes a control module, and the plurality of light sources are electrically connected to the control module, and the control module controls the on and off of the plurality of light sources through a PWM signal.

6. The method for controlling the light spot size of a blue light module according to claim 1, characterized in that: The method for controlling the light spot size of the blue light module further comprises an incident module, and the incident module is used to inject the plurality of light sources into the focusing lens in a mutually parallel manner.

7. A method for controlling the light spot size of a blue light module according to claim 6, characterized in that: The incident module further comprises at least one collimating lens, and the collimating lens is used to direct the plurality of light sources into the focusing lens in a parallel and direct manner.

8. The method for controlling the light spot size of a blue light module according to claim 7, characterized in that: There are multiple collimating lenses, and the number matches the number of light sources. The collimating lenses are used to direct the corresponding light sources into the focusing lens in a parallel and direct manner.

9. The method for controlling the light spot size of a blue light module according to claim 8, characterized in that: The incident module also includes a plurality of reflectors, which match the number of collimating lenses and correspond one to one. After the light source enters the collimating lens, it passes through the reflector and enters the focusing lens. The reflector is used to direct the plurality of light sources into the focusing lens in a mutually parallel manner.

10. A method for controlling the light spot size of a blue light module according to claim 9, characterized in that: The included angles between the collimating lens and the reflector in the incident module are the same.

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