TWM528435U - Focusing light source device - Google Patents

Description

Light source focal length adjusting device

The present invention relates to a light source focal length adjusting device, and more particularly to a light source focal length adjusting device which is excellent in heat dissipation and can be quickly or manually zoomed.

Generally, a conventional light-emitting device generally fixes a light-emitting unit to a heat-dissipating module, so that the light-emitting unit can discharge heat generated by the light-emitting module through the heat-dissipating module. In order to achieve the effect of zooming the light-emitting device, the conventional light source focal length adjusting device uses a screw-turn mechanism to change the focal length, and uses a screw-turn mechanism to drive the lift sleeve displacement, so that the distance between the sleeve displacement and the light-emitting unit is generated. Variety. However, the above-mentioned conventional light source focal length adjusting device needs to rotate the screwing mechanism. Generally, such a screw rotating mechanism needs to rotate a few turns to generate a certain distance change, and the focal length cannot be quickly adjusted, so the utility is not high.

In addition, in the conventional light-emitting device, the substrate of the light-emitting module is formed by stacking an insulating plate and a metal plate. The metal plate can ensure the rigidity of the light-emitting module and has the effect of transmitting heat generated by the light-emitting module. The light-emitting module can be positioned to fit the heat-dissipating module, so that the heat-dissipating module can arrange the heat energy Out. Generally, the heat dissipation module is composed of heat dissipation fins, and achieves heat dissipation through contact with a large area of air. However, the conventional light-emitting device only dissipates heat through the heat-dissipating module, and the front-end lens module of the light-emitting device cannot fully and effectively dissipate heat due to completely covering the light-emitting unit, so that the temperature is too high and the light-emitting module is greatly reduced. Life expectancy.

Furthermore, the lenses of conventional light-emitting devices are mostly made of plastic or glass. In the case of a lens made of plastic, it cannot be applied to a high-power LED light source, because the high-power LED light source tends to generate excessive temperature and cause the plastic lens to be melted or damaged, so its applicability is limited; In the case of a lens made of glass, it is not easily affected by high temperature, but in the case of glass, it is mostly formed by grinding or casting, so that it is impossible to form a microstructure on the light-incident or light-emitting surface. This will result in poor precision in making the lens.

Further, in the structure of the conventional light source focal length adjusting device, a light emitting unit and a cover are usually provided, and the cover may be a convex lens. After the light-emitting unit emits parallel light toward the cover, it is refracted through the curved surface of the cover, and the light can be focused and projected toward the front of the lamp to improve the illumination effect. However, the distance between the light-emitting unit and the cover of the conventional light source focal length adjusting device is usually fixed, and the user cannot freely adjust the illumination brightness, the illumination range, and the focusing distance, that is, the degree of light refraction cannot be adjusted. The user can only choose to replace the cover with different radius of curvature, which has its inconvenience in use, and has the disadvantage of excessive manufacturing cost.

Based on the above, there is a lack of a light-emitting quality that can quickly zoom, improve heat dissipation, and produce good uniformity and light transmission. The light source focal length adjustment device, so the relevant industry are seeking its solution.

Therefore, the present invention provides a light source focal length adjusting device that can freely adjust the focal length by manual or automatic means. The structure of the fins allows the user to manually adjust the focal length conveniently, and the motor with the rack allows the light source focus adjustment device to automatically adjust the focal length. Further, the secondary lens made of the silicone material can greatly improve the uniformity of light emission and the light transmittance. In addition, the heat dissipation hole structure of the displacement unit can increase the heat dissipation effect.

One embodiment of the present invention is a light source focal length adjusting device, which comprises a heat dissipation module, a light emitting module and a focal length adjusting module. The light module is connected to the heat dissipation module, and the light module emits a light. The focus adjustment module includes a limit unit, a displacement unit, a lens, a rack and a motor. The limiting unit is connected to the heat dissipation module, and the limiting unit comprises a limiting sliding rail and a first opening, and the first opening corresponds to the lighting module. The displacement unit is limited in displacement and is positioned on the limit rail. The displacement unit includes at least one heat dissipation hole for dissipating heat generated by the light emitting module. In addition, the lens is coupled to the displacement unit for displacement and corresponds to the light and the first opening. The rack is connected to the displacement unit. The motor is connected to the heat dissipation module and the rack, and the motor drives the rack displacement to change a distance between the light module and the lens.

Thereby, the light source focus adjustment device of the present invention can freely adjust the focal length by manual mode or automatic mode. The structure of the fins allows the user to manually adjust the focal length conveniently, and the motor with the rack allows the light source focus adjustment device to automatically adjust the focal length. In addition, it is made of silicone material. The secondary lens can greatly improve the uniformity of light emission and light transmittance. In addition, the heat dissipation hole structure of the displacement unit can increase the heat dissipation effect.

According to other embodiments of the foregoing embodiments, the displacement unit may include an annular body and a plurality of fins. The annular body includes an outer side wall, an inner side wall, a second opening, and a rack fixing seat. The outer side wall connects the inner side wall. The second opening corresponds to the first opening, and the rack fixing seat is fixed on the outer sidewall. As for the plurality of fins, the rings are disposed on the outer side walls, and the fins are spaced apart from each other. The displacement unit may include a plurality of heat dissipation holes, wherein a part of the heat dissipation holes are disposed on the inner side wall, and another portion of the heat dissipation holes is disposed on the outer side wall. In addition, the foregoing limiting unit may include a ring shell, an upper stop and a lower stop. The first opening is opened outwardly of the ring shell. The upper stop is disposed on the ring shell and is located at one end of the limit rail. The lower stop is disposed on the ring shell and located at the other end of the limit rail. The displacement unit reciprocally displaces between the upper stop and the lower stop. Furthermore, the aforementioned lens may be a secondary lens, and the lens is made of silicone. The aforementioned motor can be a stepper motor.

Another embodiment of the present invention is a light source focal length adjusting device, which comprises a heat dissipation module, a light emitting module, a focal length adjusting module and a rotation control module. The light emitting module is connected to the heat dissipation module, and the light emitting module emits a light. The focus adjustment module includes a limit unit, a displacement unit, a lens, a rack, and a motor. The limiting unit is connected to the heat dissipation module. The limiting unit includes a limiting slide rail and a first opening, and the first opening corresponds to the light emitting module. In addition, the displacement unit is limited in displacement and is positioned on the limit rail. The displacement unit includes at least one heat dissipation hole for dissipating heat generated by the illumination module. The lens is connected to the displacement unit and is corresponding to the light and the first opening. rack Connect the displacement unit. The motor is connected to the heat dissipation module and the rack, and the motor drives the rack displacement to change the distance between the light module and the lens. As for the rotation control module, the rotating heat dissipation module, the illumination module and the focus adjustment module are connected, and the rotation control module signal is connected to the motor to control the rack displacement.

Thereby, the novel light source focal length adjusting device realizes automatic zooming by using the rotation control module. In addition, the heat dissipation hole structure of the displacement unit can guide the airflow, so that the hot air generated by the light-emitting module is taken out, so that the heat dissipation effect is improved. In addition, the secondary lens made of the silicone material can greatly improve the uniformity of light emission and the light transmittance.

According to other embodiments of the foregoing embodiments, the foregoing rotation control module may include a transformer and a controller. The transformer is electrically connected to the light-emitting module, and the transformer supplies power to the light-emitting module and the motor to make it operate normally. The controller is electrically connected to the transformer and the signal is connected to the motor. The controller displaces the rack through the motor to displace the lens. The light source focal length adjusting device may include a rotating ring body, the rotating ring body is connected to the heat dissipation module and the rotation control module, and the rotating ring body is sleeved to the limiting unit. The rotation control module controls the rotating rotating ring body and the heat dissipation module. Furthermore, the rotating ring body has a third opening. The rotation control module can include a rotating shaft and a housing. The rotating shaft penetrates the third opening, and one end of the rotating shaft is embedded with the slot of the heat dissipation module, so that the rotating ring body is sleeved with the heat dissipation module. The housing is pivotally connected to the other end of the rotating shaft. The controller controls the rotation of the rotating shaft to drive the heat dissipation module, the rotating ring body, the lighting module and the focus adjustment module to rotate. In addition, the displacement unit may include an annular body and a plurality of fins. The annular body includes an outer sidewall, an inner sidewall, a second opening, and a rack mount. The outer side wall is connected to the inner side wall. The second opening corresponds to the first opening. tooth The strip fixing seat is fixed on the outer side wall. The plurality of fins are disposed on the outer sidewall, and the fins are spaced apart from each other. The displacement unit may include a plurality of heat dissipation holes, and some of the heat dissipation holes are disposed on the inner side wall, and the other part of the heat dissipation holes are disposed on the outer side wall. In addition, the foregoing limiting unit may include a ring shell, an upper stop and a lower stop. The first opening is opened outside the ring shell. The upper stop is disposed on the ring shell and is located at one end of the limit rail. The lower stop is disposed on the ring shell and located at the other end of the limit rail. The displacement unit reciprocally displaces between the upper stop and the lower stop. The aforementioned lens may be a secondary lens, and the lens is made of silicone. The aforementioned motor can be a stepper motor.

100‧‧‧Light source focal length adjusting device

200‧‧‧ Thermal Module

210‧‧‧ slotted

300‧‧‧Lighting module

400‧‧‧focal length adjustment module

410‧‧‧Limited unit

411‧‧‧Limited rails

412‧‧‧ first opening

413‧‧‧ ring shell

414‧‧‧Upper stop

415‧‧‧ Lower stop

416‧‧‧ accommodating openings

420‧‧‧displacement unit

422‧‧‧ vents

424‧‧‧Circular body

4241‧‧‧Outer side wall

4242‧‧‧ inner side wall

4243‧‧‧Second opening

4244‧‧‧Rack mount

426‧‧‧Fins

430‧‧‧ lens

440‧‧‧ rack

450‧‧‧Motor

500‧‧‧Rotating ring

510‧‧‧ third opening

600‧‧‧Rotary Control Module

610‧‧‧Transformer

620‧‧‧ Controller

630‧‧‧ shaft

640‧‧‧shell

Fig. 1 is a perspective view showing a light source focal length adjusting device according to an embodiment of the present invention.

Fig. 2 is an exploded view showing the light source focal length adjusting device of Fig. 1.

Fig. 3 is a perspective view showing the displacement unit of Fig. 1 pulled out.

Fig. 4A is a perspective view showing the displacement unit of Fig. 1.

FIG. 4B is a perspective view of the displacement unit combined with the limit unit of FIG. 1 .

Fig. 5 is a longitudinal sectional perspective view showing the light source focal length adjusting device of Fig. 1.

Fig. 6A is a transverse cross-sectional perspective view showing the light source focal length adjusting device of Fig. 1.

Fig. 6B is a transverse cross-sectional perspective view showing the light source focal length adjusting device of Fig. 3.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings. For the sake of clarity, many practical details will be explained in the following description. However, it should be understood that these practical details are not intended to limit the novel. That is to say, in some embodiments of the present invention, these practical details are not necessary. In addition, some of the conventional structures and elements are illustrated in the drawings in a simplified schematic manner, and the repeated elements may be represented by the same reference numerals.

Please refer to Figures 1~4B together. Fig. 1 is a perspective view showing a light source focal length adjusting device 100 according to an embodiment of the present invention. FIG. 2 is an exploded view of the light source focal length adjusting device 100 of FIG. 1. FIG. 3 is a perspective view showing the displacement unit 420 of FIG. 1 pulled out. FIG. 4A is a perspective view of the displacement unit 420 of FIG. 1. FIG. 4B is a perspective view of the displacement unit 420 of FIG. 1 combined with the limiting unit 410. As shown in the figure, the light source focal length adjusting device 100 includes a heat dissipation module 200, a light emitting module 300, a focal length adjusting module 400, a rotating ring body 500, and a rotation control module 600.

The heat dissipation module 200 is connected to the light emitting module 300. The heat dissipation module 200 is composed of a plurality of heat dissipation fins, and the heat dissipation fins are integrally connected to each other, and the heat dissipation module 200 has a cylindrical shape. In order to achieve the effect of rapid heat conduction, the heat dissipation module 200 is made of metal.

The light emitting module 300 includes a substrate and a light emitting unit. The substrate is fixed to the light emitting unit. The light emitting module 300 is fixed to the heat dissipation module 200 by the substrate. In addition, the light unit can be an LED or other light bulb. For example halogen bulbs. The light unit emits light outward and generates heat. A heat dissipating paste or a thermal conductive paste may be applied between the substrate of the light emitting module 300 and the heat dissipation module 200 to increase the heat dissipation efficiency of the heat dissipation module 200.

The focus adjustment module 400 includes a limit unit 410, a displacement unit 420, a lens 430, a rack 440, and a motor 450. The limiting unit 410 is connected to the heat dissipation module 200. The limiting unit 410 includes a limiting rail 411 , a first opening 412 , a ring shell 413 , an upper stop 414 , a lower stop 415 , and a receiving opening 416 . The extending direction of the limiting slide rail 411 is parallel to the irradiation direction of the light of the light emitting unit. The limit rail 411 is disposed on the outer wall of the ring shell 413. In addition, the first opening 412 corresponds to the light emitting unit of the light emitting module 300. The first opening 412 and the receiving opening 416 are defined in the outer casing 413. The direction of the first opening 412 is opposite to the direction of the receiving opening 416, and the first opening 412 and the receiving opening 416 are both circular, and the aperture of the first opening 412 is smaller than the aperture of the receiving opening 416. The ring shell 413 has a cylindrical shape, and an upper stopper 414 is protruded from the edge of the ring shell 413 near the receiving opening 416, and the upper stopper 414 is located at one end of the limiting rail 411; the ring shell 413 is adjacent to the first opening. A lower stop 415 is protruded from the edge of the 412, and a lower stop 415 is located at the other end of the limiting slide 411. Since the limit rail 411 is located between the upper stop 414 and the lower stop 415, the upper stop 414 and the lower stop 415 can limit the range of movement of the displacement unit 420, so that the displacement unit 420 can only be on The stopper 414 and the lower stopper 415 are reciprocally displaced. In addition, the displacement unit 420 is limited in displacement and is positioned on the limit rail 411. The displacement unit 420 includes a plurality of heat dissipation holes 422, an annular body 424, and a plurality of fins 426. The heat dissipation hole 422 is configured to dissipate the light emitting module 300 The heat generated by the light-emitting unit. The annular body 424 includes an outer sidewall 4241, an inner sidewall 4242, a second opening 4243, and a rack mount 4244. The outer side wall 4241 is connected to the inner side wall 4242, and the volume of the annular body formed by the outer side wall 4241 is larger than the volume of the annular body formed by the inner side wall 4242. The second opening 4243 corresponds to the first opening 412 and the receiving opening 416. The rack fixing seat 4244 is fixed to the outer side wall 4241. In addition, the number of the heat dissipation holes 422 is plural, and a part of the heat dissipation holes 422 are disposed on the outer side wall 4241, and the other portion of the heat dissipation holes 422 are disposed on the inner side wall 4242. The structure of the heat dissipation hole 422 can guide the airflow to bring out the hot air generated by the light-emitting module 300, thereby improving the heat dissipation effect. As for the fins 426, they are disposed on the outer sidewalls 4241, and the fins 426 are spaced apart from each other. The fin 426 can facilitate the grasping of the user's finger and push the entire displacement unit 420. That is, the user can directly pull out the displacement unit 420 by grasping the fin 426, and pull it together with the lens 430, thereby manually Pull the way to freely adjust the focus.

In addition, the lens 430 is coupled to the displacement unit 420 and corresponding to the light, the first opening 412, the second opening 4243, and the receiving opening 416. The lens 430 of this embodiment is a secondary lens which is made of silicone. Silicone has a heat resistance temperature of 200 degrees, which is higher than that of ordinary plastic materials. For example, polypropylene (Polypropylene; PP) has a heat resistance temperature of 85 degrees, and polycarbonate (Polycarbonate; PC) has a heat resistance temperature of 100 to 120. degree. When a high-power light-emitting unit is used, the temperature of the lens 430 may exceed 100 degrees, so that the use of a secondary lens made of silicone as the lens 430 can prevent the occurrence of hot melt. Furthermore, silicone can be In order to achieve a very fine surface treatment, the light source focal length adjusting device 100 can make the light uniformity and transparency of the light passing through the lens 430 under a certain range of zooming angle, for example, under the condition of an exit angle of 13 to 60 degrees. The quality of light and light is maintained at a certain level. When the lens 430 is made of a general glass material, the uniformity of the light emitted by the light source focal length adjusting device 100, the light transmittance, and the quality of the light are greatly reduced. In addition, the rack 440 passes through the heat dissipation module 200 and the rotating ring body 500 to connect the rack fixing base 4244 of the displacement unit 420. The motor 450 is connected to the heat dissipation module 200 and the rack 440. The motor 450 is fixed to the bottom of the heat dissipation module 200, and the motor 450 has a gear, and the gear and the rack 440 are coupled to each other. The motor 450 of the present embodiment is a stepping motor. The motor 450 drives the rack 440 to be displaced to change the distance between the light emitting unit of the light emitting module 300 and the lens 430. It can be seen from the above that the motor 450 can drive the displacement unit 420 together with the rack 440, so that the light source focus adjustment device 100 can automatically adjust the focal length.

The rotating ring body 500 has a hollow cylindrical shape and has a third opening 510. The rotating ring body 500 is connected to the heat dissipation module 200 and the rotation control module 600, and the rotating ring body 500 is sleeved to the limiting unit 410.

The rotation control module 600 is connected to the rotating heat dissipation module 200, the light emitting module 300, and the focus adjustment module 400. The rotation control module 600 includes a transformer 610, a controller 620, a rotating shaft 630, and a housing 640. The transformer 610 is electrically connected to the light-emitting module 300, and the transformer 610 provides power to the light-emitting module 300 and the motor 450 for normal operation. The controller 620 is electrically connected to the transformer 610 and the signal is connected to the motor 450, and the controller 620 is connected to the rotating shaft 630. Controller 620 remote control motor 450 displacement rack 440, and the rack 440 drives the displacement unit 420 through the rack mount 4244, so that the lens 430 is synchronously displaced. In addition, the housing 640 has a long cylindrical shape and has a hole, and the rotating shaft 630 penetrates the hole to connect the heat dissipation module 200. The rotating shaft 630 extends through the third opening 510 of the rotating ring body 500, and one end of the rotating shaft 630 is engaged with the recess 210 of the heat dissipation module 200, so that the rotating ring body 500 is sleeved with the heat dissipation module 200. The housing 640 is pivotally connected to the other end of the rotating shaft 630. Transformer 610 and controller 620 are both located within housing 640. The controller 620 controls the rotation of the rotating shaft 630 to drive the heat dissipation module 200, the illumination module 300, the focal length adjustment module 400, and the rotating ring body 500 to rotate, so that the light source focal length adjusting device 100 can be rotated left and right by an angle.

Referring to FIG. 1 and FIG. 3 together, when the displacement unit 420 is not pulled out, the hot air generated by the illumination module 300 is discharged from the heat dissipation hole 422 of the inner side wall 4242, and the cold air is also caused by the inner side wall 4242. The heat dissipation holes 422 flow in. In addition, when the displacement unit 420 is pulled out, the hot air generated by the light-emitting module 300 can flow out from the outer sidewall 4241 and the inner sidewall 4242, and the cold air can flow from the outer sidewall 4241 and the heat dissipation hole 422 of the inner sidewall 4242. Therefore, in the process of adjusting the focal length of the focus adjustment module 400, since the movement of the displacement unit 420 can make the convection of the hot and cold air more significant, the light source focus adjustment device 100 of the present invention is better than the conventional device structure. Cooling effect.

Please refer to FIG. 5, FIG. 6A and FIG. 6B together. FIG. 5 is a longitudinal cross-sectional perspective view of the light source focal length adjusting device 100 of FIG. 1 . Fig. 6A is a transverse cross-sectional perspective view showing the light source focal length adjusting device 100 of Fig. 1. FIG. 6B is a diagram showing the light source focal length adjusting device 100 of FIG. A transverse cross-sectional perspective view. As shown in the figure, the controller 620 of the rotation control module 600 can control the rotating shaft 630 to rotate the heat dissipation module 200, the light-emitting module 300, the focus adjustment module 400, and the rotating ring body 500, and can also remotely control the motor 450. The rotation. In detail, the motor 450 signal is connected to the wireless receiving module, and the wireless receiving module is disposed at the bottom of the heat dissipation module 200. The controller 620 is connected to the wireless transmitting module, and the wireless transmitting module is disposed in the housing 640. The wireless transmitting module signal is connected to the wireless receiving module. The controller 620 of the rotating control module 600 can remotely control the motor 450 of the focus adjusting module 400 through the transmission between the wireless signals, thereby connecting the light emitting module 300 and the lens 430. The distance changes.

It can be seen from the above embodiments that the present invention has the following advantages: First, the light source focal length adjusting device can freely adjust the focal length by manual mode or automatic mode. The structure of the fins allows the user to manually adjust the focal length conveniently, and the motor with the rack allows the light source focus adjustment device to automatically adjust the focal length. Secondly, the heat dissipation hole structure of the displacement unit can guide the airflow, so that the hot air generated by the light-emitting module is taken out, so that the heat dissipation effect is improved. Third, the secondary lens made of the silicone material can greatly improve the uniformity of light emission and the light transmittance.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Any one skilled in the art can make various changes and retouchings without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.

100‧‧‧Light source focal length adjusting device

200‧‧‧ Thermal Module

210‧‧‧ slotted

300‧‧‧Lighting module

420‧‧‧displacement unit

422‧‧‧ vents

424‧‧‧Circular body

4241‧‧‧Outer side wall

400‧‧‧focal length adjustment module

410‧‧‧Limited unit

411‧‧‧Limited rails

412‧‧‧ first opening

413‧‧‧ ring shell

414‧‧‧Upper stop

415‧‧‧ Lower stop

416‧‧‧ accommodating openings

4242‧‧‧ inner side wall

4243‧‧‧Second opening

4244‧‧‧Rack mount

426‧‧‧Fins

430‧‧‧ lens

440‧‧‧ rack

450‧‧‧Motor

500‧‧‧Rotating ring

510‧‧‧ third opening

600‧‧‧Rotary Control Module

610‧‧‧Transformer

620‧‧‧ Controller

630‧‧‧ shaft

640‧‧‧shell

Claims (15)

A light source focal length adjusting device comprises: a heat dissipating module; a light emitting module connected to the heat dissipating module, the light emitting module emitting a light; and a focal length adjusting module comprising: a limiting unit connected to the heat dissipating mold The limiting unit includes a limiting slide rail and a first opening, the first opening corresponding to the lighting module; a displacement unit, limited displacement and positioned on the limiting sliding rail, the displacement unit The heat dissipation hole is configured to dissipate heat generated by the light emitting module; a lens is connected to the displacement unit and corresponding to the light and the first opening; a rack is connected to the displacement unit; and The motor is connected to the heat dissipation module and the rack, and the motor drives the rack to be displaced to change a distance between the illumination module and the lens. The light source focal length adjusting device according to claim 1, wherein the displacement unit further comprises: an annular body comprising an outer side wall, an inner side wall, a second opening and a rack fixing seat, the outer side The wall is connected to the inner side wall, the second opening corresponds to the first opening, the rack fixing seat is fixed on the outer side wall, and a plurality of fins are arranged on the outer side wall, and the fins are arranged at intervals . The light source focal length adjusting device according to the second aspect of the invention, wherein the displacement unit further comprises a plurality of the heat dissipation holes, wherein the plurality of heat dissipation holes are disposed on the inner side wall, and the other portion of the heat dissipation holes are disposed on the outer side wall. The light source focal length adjusting device according to claim 1, wherein the limiting unit further comprises: a ring shell opening the first opening; an upper stop member disposed on the ring shell and located at the limit One end of the position rail; and a lower stop member disposed on the ring shell and located at the other end of the limit rail, the displacement unit is reciprocally displaced between the upper stop and the lower stop. The light source focal length adjusting device according to claim 1, wherein the lens is a secondary lens, and the lens is made of silicone. The light source focal length adjusting device according to claim 1, wherein the motor is a stepping motor. A light source focal length adjusting device comprises: a heat dissipation module; a light emitting module connected to the heat dissipation module, the light emitting module emitting a light; a focus adjustment module includes: a limit unit connected to the heat dissipation module, the limit unit includes a limit slide rail and a first opening, the first opening corresponds to the light emitting module; Restricting displacement and positioning on the limit rail, the displacement unit includes at least one heat dissipation hole for dissipating heat generated by the illumination module; a lens connecting the displacement unit and corresponding to the light and a first opening; a rack connecting the displacement unit; and a motor connecting the heat dissipation module and the rack, the motor driving the rack to displace a distance between the illumination module and the lens And a rotation control module is connected to rotate the heat dissipation module, the illumination module and the focus adjustment module, and the rotation control module signal is connected to the motor to control the rack displacement. The light source focus adjustment device of claim 7, wherein the rotation control module comprises: a transformer electrically connected to the illumination module, the transformer provides a power supply to the illumination module and the motor; The electrical connection is connected to the transformer and the signal is connected to the motor. The controller displaces the rack through the motor to displace the lens. The light source focal length adjusting device according to claim 8 , further comprising: a rotating ring body connected to the heat dissipation module and the rotation control module, the rotating ring body sleeves the limiting unit, the rotating control module The group controls to rotate the rotating ring body and the heat dissipation module. The light source focal length adjusting device according to claim 9, wherein the rotating ring body has a third opening, the rotation control module further comprises: a rotating shaft extending through the third opening, the one end of the rotating shaft is embedded Connecting a slot of the heat dissipation module, so that the rotating ring body is sleeved with the heat dissipation module; and a casing pivotally connecting the other end of the rotating shaft, the controller controls the rotation of the rotating shaft to drive the heat dissipation module, The rotating ring body, the light emitting module and the focus adjustment module rotate. The light source focal length adjusting device according to claim 7, wherein the displacement unit further comprises: an annular body comprising an outer side wall, an inner side wall, a second opening and a rack fixing seat, the outer side The wall is connected to the inner side wall, the second opening corresponds to the first opening, the rack fixing seat is fixed on the outer side wall, and a plurality of fins are arranged on the outer side wall, and the fins are arranged at intervals . The light source focal length adjusting device according to claim 11, wherein the displacement unit further comprises a plurality of the heat dissipation holes, and a portion The heat dissipation holes are disposed on the inner sidewall, and the other portions of the heat dissipation holes are disposed on the outer sidewall. The light source focal length adjusting device according to claim 7, wherein the limiting unit further comprises: a ring shell opening the first opening; an upper stop member disposed on the ring shell and located at the limit One end of the position rail; and a lower stop member disposed on the ring shell and located at the other end of the limit rail, the displacement unit is reciprocally displaced between the upper stop and the lower stop. The light source focal length adjusting device according to claim 7, wherein the lens is a secondary lens, and the lens is made of silicone rubber. The light source focal length adjusting device according to claim 7, wherein the motor is a stepping motor.