CN115793363A - Projection lens and laser projection equipment - Google Patents

Abstract

The application discloses projection lens and laser projection equipment belongs to laser projection technical field. The projection lens includes: heat conduction base, lens group and a plurality of radiating fin. At the projecting lens camera lens dress in laser projection equipment, and after laser projection equipment work, though still can produce a large amount of heats in the projection camera lens, but each lens in the lens group in this application all can be fixed in the logical unthreaded hole of heat conduction base, and is fixed with a plurality of radiating fin on the lateral wall of heat conduction base. Consequently, the heat that produces in the projecting lens can in time be scattered through heat conduction base and radiating fin, can effectual reduction projecting lens's operating temperature for each lens in the projecting lens takes place to be heated the expanded degree lower, and then makes the display effect of the picture that projecting lens throwed to projection screen better, and can each lens in the effectual reduction projecting lens take place the probability of damage, thereby can improve projecting lens's life.

Description

Projection lens and laser projection equipment

Technical Field

The application relates to the technical field of laser projection, in particular to a projection lens and laser projection equipment.

Background

The laser projection system comprises a projection screen and a laser projection device, wherein the laser projection device can project pictures on the projection screen to realize the functions of video playing and the like.

Current laser projection devices may generally include: projection lens, ray apparatus subassembly and light source subassembly. The light source assembly is used for providing high-intensity laser illumination light beams for the optical machine assembly; the optical-mechanical assembly is used for modulating the laser illumination light beam by an image signal to form a modulated light beam, and the modulated light beam can be emitted to the projection lens; the projection lens is used for projecting the modulated light beam onto a projection screen.

With the rapid development of laser projection technology, the energy of laser entering the projection lens is higher and higher. When the laser projection device works, a large amount of heat is generated in the projection lens. The lenses in the projection lens are usually made of transparent materials that are very susceptible to thermal expansion, and a plurality of lenses in the projection lens may be made of transparent materials with different expansion coefficients, for example, some lenses are made of glass materials, and some lenses are made of resin materials. Therefore, when the working temperature of the projection lens is high, the degree of thermal expansion of one part of lenses in the projection lens is different from the degree of thermal expansion of the other part of lenses, and the display effect of the picture projected to the projection screen by the projection lens is poor. Moreover, when the thermal expansion degree of the lens in the projection lens is large, the lens may be damaged, resulting in a short service life of the projection lens.

Disclosure of Invention

The embodiment of the application provides a projection lens and laser projection equipment. The problem that the working temperature in the projection lens in the prior art is high can be solved, the technical scheme is as follows:

in one aspect, a projection lens is provided, including: the lens comprises a heat conduction base, a lens group and a plurality of radiating fins;

the heat conduction base is provided with a light through hole;

the lens group is positioned in the light through hole and comprises a plurality of lenses which are arranged in sequence along the optical axis direction of the light through hole, and each lens is fixedly connected with the heat conducting base in the light through hole;

the plurality of radiating fins are fixedly connected with the outer side wall of the heat conducting base.

In another aspect, there is provided a laser projection apparatus including: the projection lens comprises a light source assembly, a light machine assembly and a projection lens, wherein the light machine assembly is respectively connected with the light source assembly and the projection lens, and the projection lens is the projection lens.

The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:

a projection lens includes: heat conduction base, lens group and a plurality of radiating fin. At the projecting lens camera lens dress in laser projection equipment, and after laser projection equipment work, though still can produce a large amount of heats in the projection lens, but each lens in the lens group in this application all can be fixed in the logical unthreaded hole of heat conduction base, and is fixed with a plurality of radiating fin on the lateral wall of heat conduction base. Therefore, the heat that produces in the projection lens can in time be dispelled through heat conduction base and radiating fin, can effectual reduction projection lens's operating temperature for each lens in the projection lens takes place to be heated the expanded degree lower, and then makes projection lens better to the display effect of the picture that projection screen throws, and can each lens in the effectual reduction projection lens take place the probability of damaging, thereby can improve projection lens's life.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a projection lens provided in an embodiment of the present application;

fig. 2 is a schematic structural view of a lens assembly according to an embodiment of the present application;

fig. 3 is an exploded view of another projection lens provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a single sub-base in a thermally conductive base according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of the sub-base shown in FIG. 4 on the other side;

fig. 6 is an exploded view of another projection lens provided in an embodiment of the present application;

fig. 7 is a block diagram of a projection lens provided in an embodiment of the present application;

FIG. 8 is a schematic view of another lens set according to an embodiment of the present application;

fig. 9 is a sectional view of the projection lens shown in fig. 6.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a projection lens according to an embodiment of the present disclosure. The projection lens 000 may include: a thermally conductive base 100, a lens set 200 (not labeled in fig. 1), and a plurality of heat dissipating fins 300.

The heat conductive base 100 in the projection lens 000 may have a light passing hole 101.

The lens set 200 in the projection lens 000 may be located in the light passing hole 101. For example, as shown in fig. 2, fig. 2 is a schematic structural diagram of a lens set according to an embodiment of the present application, and the lens set 200 may include: a plurality of lenses 200a arranged in parallel. Here, each lens 200a in the lens group 200 may be fixedly connected with the heat conducting base 201 in the light passing hole 101.

In the present application, the optical axes of the lenses 200a in the lens group 200 may coincide, and the optical axes of the lenses 200a may coincide with the optical axis L of the light-passing hole 101 when the lens group 200 is located in the light-passing hole 101 of the heat-conducting base 200. That is, the plurality of lenses 200a in the lens group 200 may be arranged in parallel along the optical axis L of the light-passing hole 101 at the light-passing hole 101.

The plurality of heat dissipation fins 300 in the projection lens 000 may be fixedly connected to the outer sidewall of the heat conductive base 200.

It should be noted that the drawings in the embodiments of the present application are all schematically illustrated by taking an example in which the heat dissipation fins 300 are arranged in parallel on the heat conductive base 200. In other possible implementations, the plurality of heat dissipation fins 300 may also be distributed around the periphery of the light passing hole 201 of the heat conductive base 200. The embodiment of the present application does not limit this.

In this embodiment, the projection lens 000 may be installed in the laser projection device, and the projection lens 000 may project the laser beam modulated by the optical mechanical assembly in the laser projection device onto the projection screen, so that the projection screen can present a projection picture. Although a large amount of heat is still generated in the projection lens 000 after the laser beam irradiates the projection lens 000, each lens 200a in the lens assembly 200 of the present application may be fixed in the light-passing hole 101 of the heat-conducting base 100, and a plurality of heat-dissipating fins 300 are fixed on an outer sidewall of the heat-conducting base 100. Here, each of the heat dissipation fins 300 dissipates heat conducted by the heat conductive base 100, and the heat dissipation area for dissipating heat from the heat conductive base 100 can be increased by providing a plurality of heat dissipation fins 300 on the heat conductive base 100. Therefore, heat generated in the projection lens 000 can be dissipated in time through the heat conducting base 100 and the heat dissipating fins 300, the working temperature of the projection lens 000 can be effectively reduced, the degree of thermal expansion of each lens 200a in the projection lens 000 is low, the display effect of a picture projected to a projection screen by the projection lens 000 is good, the probability of damage of each lens 200a in the projection lens 000 can be effectively reduced, and the service life of the projection lens 000 can be prolonged.

To sum up, the projection lens provided by the embodiment of the present application includes: heat conduction base, lens group and a plurality of radiating fin. At the projecting lens camera lens dress in laser projection equipment, and after laser projection equipment work, though still can produce a large amount of heats in the projection lens, but each lens in the lens group in this application all can be fixed in the logical unthreaded hole of heat conduction base, and is fixed with a plurality of radiating fin on the lateral wall of heat conduction base. Consequently, the heat that produces in the projecting lens can in time be scattered through heat conduction base and radiating fin, can effectual reduction projecting lens's operating temperature for each lens in the projecting lens takes place to be heated the expanded degree lower, and then makes the display effect of the picture that projecting lens throwed to projection screen better, and can each lens in the effectual reduction projecting lens take place the probability of damage, thereby can improve projecting lens's life.

Optionally, please refer to fig. 3, where fig. 3 is an exploded view of another projection lens provided in the embodiment of the present application. The heat conductive base 100 in the projection lens 000 may include: two oppositely disposed sub-bases 100a, and a fastener 100b for connecting the two sub-bases 100 a.

To more clearly see the structure of each sub-base 100a in the heat-conducting base 100, please refer to fig. 4, in which fig. 4 is a schematic structural diagram of a single sub-base in a heat-conducting base according to an embodiment of the present invention. Each sub-susceptor 100a in the heat conductive susceptor 100 has a mounting groove 102. At least some of the plurality of heat dissipation fins 300 in the projection lens 000 may be fixedly connected to a side of any one sub-base 100a of the two sub-bases 100a facing away from the mounting groove 102.

Wherein, after the fastener 100b in the heat-conducting base 100 connects the two sub-bases 100a, the two mounting grooves 102 in the two sub-bases 100a are used for the light-passing holes 101 of the heat-conducting base 100.

Illustratively, as shown in fig. 4 and 5, fig. 5 is a schematic view of the sub-base shown in fig. 4 on the other side, each sub-base 100a in the heat-conducting base 100 further has a first through-hole 103, and a plurality of heat-dissipating fins 300 fixedly connected to the sub-base 100a in the heat-conducting base 100 have second through-holes 301 communicating with the first through-holes 103. The fastener 100b in the heat conductive base 100 may be a fastening bolt or a fastening screw. Thus, after the fastening member 100b passes through the second through holes 301 distributed in the plurality of heat dissipating fins 300 fixedly connected to one sub-base 100a, the two first through holes 103 distributed in the two sub-bases 100a, and the second through holes 301 distributed in the plurality of heat dissipating fins 300 fixedly connected to the other sub-base 100a in this order, the two sub-bases 100a can be fastened together. Here, in order to ensure that the fasteners 100b can stably fasten the two sub-bases 100a together, it is necessary to ensure that the number of the fasteners 100b is at least two, and at least two of the fasteners 100b are required to be respectively distributed on both sides of the heat conductive base 100.

In the present application, as shown in fig. 4, of the two sub-bases 100a in the heat conductive base 100, one side of each sub-base 100a close to the other sub-base 100a has a sealing groove 104. After the two sub-bases 100a are connected by the fastening member 100b, the sealing groove 104 formed in one sub-base 100a can be fastened to the sealing groove 104 formed in the other sub-base 100 a. In this case, the two sealing grooves 104 formed in the two sub-bases 100a by being engaged with each other can constitute a sealing chamber, and the projection lens 000 may further include: fix the sealing strip (not shown in the figure) in the seal chamber, can seal the gap between two child bases 100a through the sealing strip to prevent that external steam or dust from getting into logical unthreaded hole 101 from the gap between two child bases 100a in, and then can guarantee that projection lens 000's leakproofness is better, make projection lens 000 can not lead to leading to the lens 200a in the logical unthreaded hole 101 to receive the damage because of the invasion of external steam or dust.

Here, in order to ensure that the sealing strips can better seal the projection lens 000, it is necessary to ensure that the sealing strips are in a long strip shape, and it is also necessary to ensure that the number of the sealing strips is two, the two sealing strips can be distributed on two sides of the light through hole 101, and the length direction of each sealing strip can be parallel to the optical axis L of the light through hole 101. In this case, the number of the sealing grooves 104 distributed on each sub-base 100a is two, and the two sealing grooves 104 may be located at both sides of the mounting groove 102, and the extending direction of each sealing groove 104 may be parallel to the extending direction of the mounting groove 102.

In one possible implementation, the plurality of heat dissipation fins 300 in the projection lens 000 may be fixedly connected to any one of the sub-bases 100a in the heat conductive base 100. In this case, when the plurality of heat radiating fins 300 are all fixedly connected to the side of one sub-base 100a of the heat conductive base 100 facing away from the mounting groove 102, another sub-base 100a of the heat conductive base 100 may not be connected to the heat radiating fins 300.

In another possible implementation manner, a part of the plurality of heat dissipation fins 300 may be fixedly connected to one sub-base 100a of the heat conductive base 100, and another part of the plurality of heat dissipation fins 300 may be fixedly connected to another sub-base 100a of the heat conductive base 100. In this case, the plurality of heat dissipation fins 300 in the projection lens 000 may be divided into two groups. The two sets of heat dissipation fins 300 may correspond one-to-one to the two sub-mounts 100a in the thermally conductive base 100. Here, the number of the heat radiation fins 300 in each set of the heat radiation fins 300 in the projection lens 000 is plural. And each heat dissipation fin 300 in each set of heat dissipation fins 300 in the projection lens 000 can be fixedly connected with one side of the corresponding sub-base 100a departing from the mounting groove 102. In this way, a plurality of heat dissipation fins 300 are connected to each sub-base 100a of the heat conduction base 100, so that the number of the heat dissipation fins 300 fixedly connected to the heat conduction base 100 can be increased, the heat dissipation area of the heat conduction base 100 can be further increased, and the heat dissipation efficiency of the lens assembly 200 distributed in the light through hole 101 of the heat conduction base 100 can be further improved.

Alternatively, in the projection lens 000, the number of the heat dissipation fins 300 connected to one sub-mount 100a may be equal to the number of the heat dissipation fins 300 connected to another sub-mount 100 a.

In the present application, the plurality of heat dissipation fins 300 connected to one sub-base 100a may be equally spaced, and the plurality of heat dissipation fins 300 connected to another sub-base 100a may be equally spaced. When the sizes of the respective sub-bases 100a in the thermally conductive base 100 may be the same, the distance between any two adjacent heat dissipation fins 300 among the plurality of heat dissipation fins 300 connected to one sub-base 100a may be equal to the distance between any two adjacent heat dissipation fins 300 among the plurality of heat dissipation fins 300 connected to another sub-base 100 a. In this case, the structure of one sub-base 100a and the plurality of heat dissipation fins 300 fixedly connected to the sub-base 100a in the projection lens 000 may be identical to the structure of the other sub-base 100a and the plurality of heat dissipation fins 300 fixedly connected to the sub-base 100 a.

In the embodiment of the present application, each sub-base 100a and the heat dissipation fins 300 fixedly connected to the sub-base 100a may be a unitary structure, and the unitary structure is made of a metal material. In this case, since the metal material has a good thermal conductivity, when the sub-base 100a and the heat dissipation fins 300 fixedly connected to the sub-base 100a are made of the metal material, the efficiency of heat dissipation of the lens set 200 can be further improved. Meanwhile, when the sub-base 100a and the heat dissipation fins 300 fixedly connected to the sub-base 100a are an integrated structure, since the structure of one sub-base 100a and the plurality of heat dissipation fins 300 fixedly connected to the sub-base 100a in the projection lens 000 is completely the same as the structure of the other sub-base 100a and the plurality of heat dissipation fins 300 fixedly connected to the sub-base 100a, two sets of completely identical sub-bases 100a and heat dissipation fins 300 fixedly connected thereto may be formed based on the same mold, and after the two sets of structures are fastened by the fasteners 100b, the heat conduction base 100 with the light passing holes 101 and the plurality of heat dissipation fins 300 distributed on the outer side wall of the heat conduction base 100 may be obtained. Thus, the manufacturing cost of the projection lens 000 can be effectively reduced.

Optionally, as shown in fig. 6, fig. 6 is an exploded view of another projection lens provided in the embodiment of the present application. The arrangement direction of the plurality of heat dissipation fins 300 in the projection lens 000 may be perpendicular to the optical axis L of the light passing hole 101. Here, the arrangement direction of the plurality of heat dissipation fins 300 connected to each sub-mount 100a in the heat conductive base 100 may be perpendicular to the optical axis L of the light passing hole 101. In this way, the extending direction of the gap between two adjacent heat dissipating fins 300 among the plurality of heat dissipating fins 300 may be parallel to the optical axis L of the light transmitting hole 101.

In the present application, the heat dissipation fin 300 in the projection lens 000 may have a first mounting hole 302. The projection lens 000 may further include: the heat dissipation fan 400 is fixed in the first mounting hole 302, and the air outlet surface 401 of the heat dissipation fan 400 in the projection lens 000 may be perpendicular to the optical axis L of the light passing hole 101. Since the heat-dissipating fins 300 are connected to each of the sub-bases 100a of the heat-conducting base 100, the number of the heat-dissipating fans 400 in the present invention may be one or two. When the number of the heat dissipation fans 400 is one, the heat dissipation fins 300 connected to any one of the sub-bases 100a in the heat conductive base 100 may have first mounting holes 302, and the heat dissipation fan 400 may be fixed in the first mounting holes 302. When the number of the heat dissipation fans 400 is two, the heat dissipation fins 300 connected to each sub-base 100a in the heat conductive base 100 may have the first mounting holes 302, one heat dissipation fan 400 may be fixed in the first mounting hole 302 of the heat dissipation fin 300 connected to one sub-base 100a, and another heat dissipation fan 400 may be fixed in the first mounting hole 302 of the heat dissipation fin 300 connected to another sub-base 100 a. The embodiment of the present application does not limit this.

Here, since the width of the heat-radiating fan 400 is much greater than the thickness of a single heat-radiating fin 300 in the arrangement direction of the plurality of heat-radiating fins 300 connected to the sub-mount 100 a. Therefore, at least some of the plurality of heat dissipation fins 300 connected to the sub-mount 100a may have the first mounting holes 302, and the respective first mounting holes 302 are communicated with each other. Thus, the heat dissipation fan 400 can be assembled in the first mounting holes 302 communicating with each other.

In this case, a surface of the heat dissipating fan 400 opposite to the air outlet surface 401 is an air inlet surface 402, and when the heat dissipating fan 400 rotates, an air flow from the air inlet surface 402 to the air outlet surface 401 can be formed at both sides of the heat dissipating fan 400 by the cooperation of the air inlet surface 402 and the air outlet surface 401 of the heat dissipating fan 400. The air outlet surface 401 of the heat dissipation fan 400 is perpendicular to the optical axis L of the light transmitting hole 101, and the extending direction of the gap between two adjacent heat dissipation fins 300 is parallel to the optical axis L of the light transmitting hole 101. Therefore, the air outlet surface 401 of the heat dissipation fan 400 may be perpendicular to the extending direction of the gap between two adjacent heat dissipation fins 300. Thus, after the heat dissipation fan 400 rotates, an airflow channel can be formed between two adjacent heat dissipation fins 300, so that heat conducted to the heat dissipation fins 300 can be quickly dissipated under the action of the airflow channel. In this manner, by providing the heat dissipation fan 400 in the projection lens 000, the efficiency of heat dissipation of the lens group 200 distributed in the light passing hole 101 of the heat conductive base 100 can be further improved.

In the embodiment of the present application, as shown in fig. 6, the heat dissipation fins 300 in the projection lens 000 may further have second mounting holes 303. As shown in fig. 6 and 7, fig. 7 is a block diagram of a projection lens provided in an embodiment of the present application. The projection lens 000 may further include: a temperature sensor 500 fixed in the second mounting hole 302, and a controller 600 electrically connected to the temperature sensor 500 and the heat dissipation fan 400, respectively. Here, the temperature sensor 500 may be in contact with an outer sidewall of the heat conductive base 100. It should be noted that the number of the temperature sensors 500 in the present application may be one or two, and the setting manner of the temperature sensors 500 may refer to the setting manner of the cooling fan 400, which is not described herein again.

Wherein the controller 600 in the projection lens 000 may be configured to: the operating state of the heat dissipation fan 400 is controlled based on the temperature detected by the temperature sensor 500.

In this application, when the temperature sensor 500 contacts the outer sidewall of the heat conducting base 100, the temperature sensed by the temperature sensor 500 is the working temperature of the lens set 200 fixed in the light guide hole 101 of the heat conducting base 100. Also, after the temperature sensor 500 acquires the operating temperature of the lens group 200, the operating temperature may be transmitted to the controller 600. Thus, the controller 600, after receiving the working temperature, can detect whether the working temperature of the lens set 200 is less than a preset temperature threshold (e.g., 30 ℃). When the controller 600 determines that the working temperature of the lens group 200 is greater than or equal to the preset temperature threshold, it indicates that the working temperature of the lens group 200 is higher, and at this time, the controller 600 may control the cooling fan 400 to be in an open state, so that the cooling fan 400 can quickly cool the lens group 200. When the controller 600 determines that the working temperature of the lens group 200 is lower than the preset temperature threshold, it indicates that the working temperature of the lens group 200 is relatively moderate, at this time, the heat dissipation fan 400 does not need to rotate any more, and the controller 600 can control the heat dissipation fan 400 to be in a stop state, so that the power consumption of the laser projection apparatus integrated with the projection lens 000 can be reduced.

In this embodiment, after the controller 600 determines that the working temperature of the lens set 200 is greater than or equal to the predetermined temperature threshold, the controller 600 may determine the rotation speed of the heat dissipation fan 400 based on a difference between the working temperature of the lens set 200 and the predetermined temperature threshold. The difference between the working temperature of the lens set 200 and the predetermined temperature threshold may be positively correlated to the rotation speed of the cooling fan 400. That is, the greater the difference between the working temperature of the lens set 200 and the preset temperature threshold, the greater the rotation speed of the cooling fan 400; the smaller the difference between the working temperature of the lens set 200 and the preset temperature threshold, the smaller the rotation speed of the cooling fan 400. Thus, the efficiency of the heat dissipation fan 400 in dissipating heat from the lens group 200 can be further improved.

Optionally, as shown in fig. 8, fig. 8 is a schematic structural view of another lens set provided in the embodiment of the present application. The lens group 200 in the projection lens 000 may include: a first sub-lens group 201, a second sub-lens group 202, and a third sub-lens group 203. Here, each sub-lens group in the lens group 200 may include at least one lens 200a. The second sub-lens group 202 in the lens group 200 may be located between the first sub-lens group 201 and the third sub-lens group 203.

As shown in fig. 9, fig. 9 is a sectional view of the projection lens shown in fig. 6. The first light passing hole 101 of the heat conductive base 100 may include: a first sub light-passing hole 1011 for fixing the second sub lens group 202, a second sub light-passing hole 1012 for fixing the first sub lens group 201, and a third sub light-passing hole 1013 for fixing the third sub lens group 203. Here, the first sub light transmitting hole 1011 is located between the second sub light transmitting hole 1012 and the third sub lens group 203, and one end of the first sub light transmitting hole 1011 may communicate with the second sub light transmitting hole 1012, and the other end of the first sub light transmitting hole 1011 may communicate with the third sub light transmitting hole 1013.

In the embodiment of the present application, the sizes of the lenses 200a in the second sub-lens group 202 are smaller than the sizes of the lenses 200a in the first sub-lens group 201, and are smaller than the sizes of the lenses 200a in the third sub-lens group 201. Therefore, the inner diameter of the first sub light through hole 1011 for mounting the second sub lens group 202 may be smaller than the inner diameter of the second sub light through hole 1012 for mounting the first sub lens group 201, and smaller than the inner diameter of the third sub light through hole 1013 for mounting the third sub lens group 203. Since the surface of each heat dissipating fin 300 facing away from the heat conductive base 100 may be flush, in each heat dissipating fin 300, the height of the portion adjacent to the first sub light passing hole 1011 is greater than the height of the portion adjacent to the second sub light passing hole 1012 and greater than the height of the portion adjacent to the third sub light passing hole 1013.

In this case, the first mounting hole 302 may be provided in a portion of the heat dissipation fin 300 adjacent to the first sub light passing hole 1011. In this way, the heat dissipation fan 400 with a larger size can be completely disposed in the first mounting hole 302 without affecting the overall heat dissipation effect of the heat dissipation fin 300. That is, the first mounting hole 302 may be provided at an intermediate position of the heat dissipation fin 300. Since the heat dissipation fan 400 fixed in the first mounting hole 302 is in an open state, an air flow passage may be formed between two adjacent heat dissipation fins 300. Therefore, the heat on the portion of the heat dissipation fin 300 close to the air inlet surface 402 of the heat dissipation fan 400 can be quickly dissipated under the action of the airflow channel; and the heat on the portion of the heat dissipation fin 300 close to the air outlet surface 401 of the heat dissipation fan 400 can also be quickly dissipated under the action of the airflow channel.

In the present application, as shown in fig. 8, the projection lens 000 may further include: a mirror 700. The third sub-lens group 203 in the lens group 200 is closer to the reflector 700 than the first sub-lens group 201. In this way, after the projection lens 000 is assembled in the laser projection apparatus, the first sub-lens group 201 in the lens group 200 is closer to the optical-mechanical assembly in the laser projection apparatus than the third sub-lens group 203. The laser beam modulated by the optical-mechanical component of the laser projection apparatus may sequentially pass through the first sub-lens group 201, the second sub-lens group 202, and the third sub-lens group 203 in the lens group 200 and then irradiate to the reflector 700, and each sub-lens group in the lens group 200 may adjust the laser beam, so that the reflector 700 may reflect the adjusted laser beam to the projection screen, so as to present a corresponding projection picture on the projection screen.

In this case, the working temperature of the lens 200a in the lens set 200 is higher when the laser projection apparatus is working. Therefore, the operating temperature of the first sub-lens group 201 in the lens group 200 may be higher than the operating temperature of the third sub-lens group 203. In this way, the second mounting hole 303 can be provided in a portion of the heat radiation fin 300 adjacent to the second sub light passing hole 1012. So, can guarantee that the temperature sensor 500 who fixes in second mounting hole 203 can detect the operating temperature of the first sub-lens group 201 that the temperature is the highest in lens group 200, and is follow-up, and controller 600 is based on the operating temperature of first sub-lens group 201, and during control radiator fan 500's operating condition, can guarantee that the operating temperature of each lens 200a in the lens group 200 is all can not be too high, and then can guarantee that the thermal expansion degree of each lens 200a in the lens group 200 is all less.

Moreover, the air inlet surface 402 of the heat dissipation fan 400 faces the optical mechanical assembly, and the air outlet surface 401 of the heat dissipation fan 400 faces the reflector 700. Thus, when the heat dissipation fan 400 rotates, the direction of the airflow channel formed between two adjacent heat dissipation fins 300 is: the heat dissipation efficiency of the first sub-lens group 201 can be further improved from the optical mechanical assembly to the reflector 700.

Optionally, as shown in fig. 6, the side of the heat-conducting base 100 facing the optical machine component has a connector 100c. The heat conducting base 100 can be fixedly connected with the housing of the opto-mechanical assembly by a connector 100c.

In the embodiment of the present application, as shown in fig. 8 and fig. 9, the number of the first sub light through holes 1011 in the light through hole 101 of the heat conductive base 100 may be one, the number of the lenses 200a in the second sub lens group 202 in the lens group 200 may be multiple, and each lens 200a in the second sub lens group 202 may be fixed in the first sub light through hole 1011. For example, each lens 200a in the second sub lens group 202 may be assembled with the lens barrel first, and then the lens barrel assembled with the second sub lens group 202 is integrally assembled into the first sub light passing hole 1011 of the heat conducting base 100.

The number of the second sub light-transmitting holes 1012 in the light-transmitting hole 101 of the heat conducting base 100 may be at least one, and the number of the second sub light-transmitting holes 1012 may be the same as the number of the lenses 200a in the first sub lens group 201 in the lens group 200. Here, when there are a plurality of lenses 200a in the first sub-lens group 201, there are also a plurality of second sub light transmitting holes 1012, and the second sub light transmitting holes 1012 may be connected in sequence. In the present application, the plurality of lenses 200a in the first sub-lens group 201 may correspond to the plurality of second sub-light passing holes 1012 one to one, and each lens 200a in the first sub-lens group 201 may be fixed in the corresponding second sub-light passing hole 1012. For example, an internal thread may be provided in each second sub light-passing hole 1012, and after a certain lens 200a in the first sub lens group 201 is placed in the corresponding second sub light-passing hole 1012, a pressing ring with an external thread and matching the size of the second light-passing hole 1012 may be screwed into the second light-passing hole 1012, so that the pressing ring can fix the lens 200a in the corresponding second sub light-passing hole 1012.

The number of the third sub light-passing holes 1013 in the light-passing holes 101 of the heat-conducting base 100 may be at least one, and the number of the third sub light-passing holes 1013 may be the same as the number of the lenses 200a in the third sub lens group 203 in the lens group 200. Here, when the number of lenses 200a in the third sub-lens group 203 is plural, the number of the third sub light passing holes 1013 is also plural, and the respective third sub light passing holes 1013 may be sequentially communicated. In this application, the plurality of lenses 200a in the third sub-lens group 203 may correspond to the plurality of third sub-light passing holes 1013 one to one, and each lens 200a in the third sub-lens group 203 may be fixed in the corresponding third sub-light passing hole 1013. It should be noted that, the manner in which the lenses 200a in the third sub-lens group 203 are fixed in the corresponding third sub-light-passing holes 1013 may refer to the manner in which the lenses 200a in the first sub-lens group 201 are fixed in the corresponding second sub-light-passing holes 1012, and details are not repeated here.

In the embodiment of the present application, in order to assemble each lens 200a in the first sub lens group 201 in the corresponding second sub light passing hole 1012, it is necessary to ensure that the inner diameter of each second sub light passing hole 1012 in the plurality of second sub light passing holes 1012 gradually increases in a direction away from the first sub light passing hole 1011, and it is necessary to ensure that the size of each lens 200a in the first sub lens group 201 gradually increases in a direction away from the first sub light passing hole 1011. In this way, the lenses 200a in the first sub-lens group 201 can be sequentially assembled into the corresponding second sub-light passing holes 1012 in the order of increasing the size of the lenses 200a in the first sub-lens group 201.

Similarly, in order to assemble each lens 200a in the third sub-lens group 203 into the corresponding third sub-light-passing hole 1013, it is necessary to ensure that the inner diameter of each third sub-light-passing hole 1013 in the plurality of third sub-light-passing holes 1013 gradually increases in the direction away from the first sub-light-passing hole 1011, and to ensure that the size of each lens 200a in the third sub-lens group 203 gradually increases in the direction away from the third sub-light-passing hole 1013. In this way, the lenses 200a in the third sub-lens group 203 can be sequentially assembled into the corresponding third sub-light passing holes 1013 in the order from small to large of the sizes of the lenses 200a in the third sub-lens group 203.

To sum up, the projection lens provided by the embodiment of the present application includes: heat conduction base, lens group and a plurality of radiating fin. At the projecting lens camera lens dress in laser projection equipment, and after laser projection equipment work, though still can produce a large amount of heats in the projection lens, but each lens in the lens group in this application all can be fixed in the logical unthreaded hole of heat conduction base, and is fixed with a plurality of radiating fin on the lateral wall of heat conduction base. Consequently, the heat that produces in the projecting lens can in time be scattered through heat conduction base and radiating fin, can effectual reduction projecting lens's operating temperature for each lens in the projecting lens takes place to be heated the expanded degree lower, and then makes the display effect of the picture that projecting lens throwed to projection screen better, and can each lens in the effectual reduction projecting lens take place the probability of damage, thereby can improve projecting lens's life.

The embodiment of the present application further provides a laser projection apparatus, which may include: light source subassembly, ray apparatus subassembly and projection lens. The optical-mechanical assembly is respectively connected with the light source assembly and the projection lens. The projection lens may be the projection lens in the above embodiment. For example, the projection lens may be the projection lens shown in fig. 1, 3, or 6.

The light source assembly is used for providing high-intensity laser illumination light beams for the optical-mechanical assembly; the optical-mechanical assembly is used for modulating the laser illumination light beam by an image signal to form a modulated light beam, and the modulated light beam can be emitted to the projection lens; the projection lens is used for projecting the modulated light beam onto a projection screen so as to present a projection picture on the projection screen.

In this application, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.

The above description is intended to be exemplary only, and not to limit the present application, and any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included therein.

Claims (10)

1. A projection lens, comprising: the lens comprises a heat conduction base, a lens group and a plurality of radiating fins;

the heat conduction base is provided with a light through hole;

the lens group is positioned in the light through hole and comprises a plurality of lenses which are arranged in sequence along the optical axis direction of the light through hole, and each lens is fixedly connected with the heat conducting base in the light through hole;

the plurality of radiating fins are fixedly connected with the outer side wall of the heat conducting base.

2. The projection lens of claim 1 wherein the thermally conductive base comprises: the heat radiating device comprises two oppositely arranged sub bases and a fastener for connecting the two sub bases, wherein each sub base is provided with an installation groove, and at least part of heat radiating fins in the plurality of heat radiating fins are fixedly connected with one side of any one sub base, which is away from the installation groove;

and after the fastener connects the two sub bases, the two mounting grooves in the two sub bases are used for forming the light through hole.

3. The projection lens as claimed in claim 2, wherein the plurality of heat dissipation fins are divided into two groups, two groups of heat dissipation fins correspond to the two sub-bases one by one, and each heat dissipation fin in each group of heat dissipation fins is fixedly connected with one side of the corresponding sub-base away from the mounting groove.

4. The projection lens of claim 3 wherein the number of fins connected to one sub-mount is equal to the number of fins connected to another sub-mount within the projection lens.

5. The projection lens of any one of claims 2 to 4 wherein each sub-base and the heat dissipation fins fixedly connected with the sub-base are an integral structure, and the integral structure is made of a metal material.

6. The projection lens according to any one of claims 1 to 4, wherein the arrangement direction of the plurality of heat dissipation fins is perpendicular to the optical axis of the light passing hole; the heat dissipation fin has a first mounting hole, and the projection lens further includes: and the air outlet surface of the heat radiation fan is vertical to the optical axis of the light through hole.

7. The projection lens of claim 6 wherein the heat sink fins further have second mounting holes, the projection lens further comprising: the temperature sensor is fixed in the second mounting hole, and the controller is electrically connected with the temperature sensor and the cooling fan respectively;

wherein the controller is configured to: and controlling the working state of the heat dissipation fan based on the temperature detected by the temperature sensor.

8. The projection lens of claim 7 wherein the set of lenses comprises: the second sub-lens group is positioned between the first sub-lens group and the third sub-lens group, and the first sub-lens group is closer to the optical mechanical component relative to the third sub-lens group;

the first mounting hole is adjacent to the second sub-lens group, and the second mounting hole is adjacent to the first sub-lens group.

9. The projection lens of claim 8, wherein the light passing hole comprises: the first sub light-transmitting hole is used for fixing the second sub lens group, at least one second sub light-transmitting hole is communicated with one end of the first sub light-transmitting hole, and at least one third sub light-transmitting hole is communicated with the other end of the first sub light-transmitting hole;

each lens in the second sub lens group is fixed in the first sub light through hole;

the number of the lenses in the first sub lens group is the same as that of the second sub light through holes, and each lens in the first sub lens group is fixed in the corresponding second sub light through hole;

the number of the lenses in the third sub-lens group is the same as that of the third sub-light through holes, and each lens in the third sub-lens group is fixed in the corresponding third sub-light through hole.

10. A laser projection device, comprising: a light source assembly, a light-mechanical assembly and a projection lens, wherein the light-mechanical assembly is respectively connected with the light source assembly and the projection lens, and the projection lens is the projection lens of any one of the claims 1 to 9.

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