CN118859615A - Laser projection equipment - Google Patents

Abstract

The present invention provides a laser projection device including a refractive unit, a reflective diffuser, a first lens array, a focusing lens having a first lens portion and a second lens portion, a laser light source group including a first color light unit emitting a first color light, an imaging module and a projection lens. The refractive unit is tiltedly arranged on the light incident axis of the first lens portion to reflect the first color light to the first lens portion. The reflective diffuser is arranged on one side of the focusing lens to reflect the first color light to travel along the light exit axis of the second lens portion. The first lens array is arranged on the light exit axis to receive the first color light, and the length of the first lens array along the first central axis of the focusing lens is less than or equal to one-half of the diameter of the focusing lens and the width along the second central axis is less than or equal to the diameter of the focusing lens. The imaging module is arranged on the light exit axis to receive the first color light in sequence with the projection lens.

Description

Laser projection equipment

Technical Field

The present invention relates to a laser projection device, and in particular to a laser projection device in which the length of a lens array is reduced to less than or equal to half of the diameter of a focusing lens and the width of the lens array is less than or equal to the diameter of the focusing lens.

Background Art

Generally speaking, common laser projection equipment uses a light combining module to generate a multi-color laser beam required for subsequent projection imaging. In current applications, in order to further reduce the size of the laser light source, the common design packages red, green, and blue laser diodes (Laser diode) in multiple rows in parallel into a single multi-color laser diode light source module, so as to achieve the purpose of simultaneously providing red, green, and blue light to the light combining module of the laser projection equipment. In actual applications, in order to further reduce the overall volume of the laser projection equipment, the prior art usually adopts a design that reduces the size of the projection lens. However, as shown in FIG1 , since the laser spot 1 emitted by the light combining module of the laser projection equipment is symmetrically circular on the X-axis and the Y-axis, if the diameter of the projection lens 2 is directly reduced, the efficiency of the laser light use of the laser projection equipment will be significantly reduced, thereby greatly affecting the image projection brightness and projection quality of the laser projection equipment.

Therefore, it is necessary to design a new type of laser projection equipment to overcome the above-mentioned defects.

Summary of the invention

An object of the present invention is to provide a laser projection device, which can reduce the impact on the laser light utilization efficiency of the laser projection device when a design of reducing the projection lens diameter is adopted to reduce the overall volume of the laser projection device.

To achieve the above-mentioned purpose, the present invention provides a laser projection device, comprising: a laser light source group, including a plurality of first color light units arranged in sequence, the plurality of first color light units emitting first color light; a focusing lens, having a first lens portion and a second lens portion; a refraction unit, arranged obliquely relative to the focusing lens on the incident light axis of the first lens portion and opposite to the plurality of first color light units, for reflecting the first color light along the incident light axis to be incident to the first lens portion; a reflective diffuser, arranged on one side of the focusing lens, for receiving the first color light transmitted from the first lens portion and reflecting the first color light to the second lens portion, so that the first color light travels along the light exit axis of the second lens portion The first central axis of the focusing lens is respectively perpendicular to the light incident axis and the light output axis, and the second central axis of the focusing lens is perpendicular to the first central axis; a first lens array is arranged on the light output axis, and is used to receive the first color light transmitted from the second lens portion, the length of the first lens array along the first central axis is less than or equal to half of the diameter of the focusing lens, and the width of the first lens array along the second central axis is less than or equal to the diameter of the focusing lens; an imaging module is arranged on the light output axis, and is used to receive the first color light transmitted from the first lens array to form a projection beam; and a projection lens receives the projection beam transmitted from the imaging module for optical projection.

Preferably, it also includes: a second lens array, connected to the first lens array and arranged on the light incident axis to be located between the first lens portion and the refractive unit, for receiving the first color light; wherein the size of the microlens on the second lens array is smaller than the size of the microlens on the first lens array.

Preferably, the number of micro lenses on the second lens array is greater than the number of micro lenses on the first lens array.

Preferably, it further comprises: a diffusion sheet, which is arranged at at least one of a position between the laser light source group and the refraction unit, between the refraction unit and the first lens portion, and between the second lens portion and the first lens array.

Preferably, the diffuser rotates or reciprocates relative to the focusing lens.

Preferably, the reflective diffuser includes a reflective sheet and a haze diffusion layer, the haze diffusion layer is formed by processing or attached or coated on the reflective sheet, and the first color light passes through the second lens portion after being homogenized and reflected by the reflective diffuser.

Preferably, the reflective diffuser is movably or rotatably disposed on the side of the condenser lens.

Preferably, the refraction unit comprises a reflection sheet, and the reflection sheet is obliquely disposed on the light incident axis to reflect the first color light to the first lens portion.

Preferably, the laser light source group also includes a plurality of second color light units and a plurality of third color light units arranged in sequence, the plurality of second color light units and the plurality of third color light units are adjacent to the plurality of first color light units and emit the second color light and the third color light respectively, and the refractive unit further includes a color separation plate; the color separation plate is obliquely arranged on the light incident axis relative to the first lens portion and is opposite to the plurality of second color light units and the plurality of third color light units, and is used to reflect the second color light and the third color light and allow the first color light to penetrate, and the first color light, the second color light and the third color light pass through the first lens portion along the light incident axis to be incident on the reflective diffuser, are reflected by the reflective diffuser and sequentially penetrate the second lens portion and the first lens array.

Preferably, the first color light is red light, the second color light is blue light, and the third color light is green light.

Preferably, the imaging module includes: at least one relay lens disposed on the light-emitting axis to receive the first color light transmitted from the first lens array; an imaging element disposed on the light-emitting axis; and a right-angle prism disposed on the light-emitting axis and located between the at least one relay lens and the imaging element, for allowing the first color light transmitted from the at least one relay lens to penetrate into the imaging element and reflect the projection light beam transmitted back by the imaging element to the projection lens.

Preferably, the imaging module includes: at least one relay lens, arranged on the light-emitting axis to receive the first color light transmitted from the first lens array; a first right-angle prism, arranged on the light-emitting axis, for receiving the first color light transmitted from the at least one relay lens for reflection; an imaging element, located on one side of the first right-angle prism, for receiving the first color light reflected from the first right-angle prism to form the projection light beam; and a second right-angle prism, arranged on the light-emitting axis and opposite to the first right-angle prism, for allowing the projection light beam transmitted from the imaging element to penetrate into the projection lens.

Preferably, the imaging element is a digital micro-mirror device.

Preferably, the first central axis of the condenser lens intersects and is perpendicular to the light incident axis and the light output axis respectively.

Preferably, the focusing lens is a collimating lens.

Compared with the prior art, a laser projection device provided by an embodiment of the present invention can reduce the size of the laser spot projected by the projection light beam in the projection lens to an elliptical shape by reducing the length of the first lens array to less than or equal to half of the diameter of the focusing lens and the width of the first lens array to less than or equal to the diameter of the focusing lens. Thus, compared with the symmetrical circular design of the laser spot adopted in the prior art, the present invention can not only reduce the impact on the laser light utilization efficiency of the laser projection device when adopting a design of reducing the projection lens diameter to reduce the overall volume of the laser projection device, but also improve the flexibility of the laser projection device in the selection of lens size.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a projection lens and a laser spot in the prior art.

FIG. 2 is a schematic side view of a laser projection device according to an embodiment of the present invention.

FIG. 3 is a schematic diagram showing the size ratio of the first lens array and the focusing lens in FIG. 2 .

FIG. 4 is a simplified front view of the first lens array of FIG. 2 .

FIG. 5 is a schematic side view of a laser projection device according to another embodiment of the present invention.

FIG. 6 is a simplified front view of the first lens array and the second lens array of FIG. 5 .

FIG. 7 is a schematic side view of a laser projection device according to another embodiment of the present invention.

FIG. 8 is a schematic side view of a laser projection device according to another embodiment of the present invention.

DETAILED DESCRIPTION

In order to provide a further understanding of the purpose, structure, features and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

Please refer to Figure 2, which is a side view schematic diagram of a laser projection device 10 proposed according to an embodiment of the present invention. As shown in Figure 2, the laser projection device 10 is used to perform laser projection imaging. The laser projection device 10 includes a laser light source group 12, a focusing lens 14, a refractive unit 16, a reflective diffuser 18, a first lens array 20, an imaging module 22, and a projection lens 24.

The laser light source group 12 includes a plurality of first color light units 26 arranged in sequence, a plurality of second color light units 28 arranged in sequence and adjacent to the first color light units 26, and a plurality of third color light units 30. In FIG. 2 , only one of the first color light unit 26, the second color light unit 28, and the third color light unit 30 is shown for simplicity. The actual number configuration and arrangement method depend on the actual application of the laser projection device 10 (for example, a configuration design in which four first color light units 26 are arranged in sequence in one row and two third color light units 30 and three second color light units 28 are arranged in sequence in another row can be adopted, but is not limited to this). In this embodiment, the first color light unit 26 may preferably be a red laser diode to emit a first color light L1 with a red light color, the second color light unit 28 may preferably be a blue laser diode to emit a second color light L2 with a blue light color, and the third color light unit 30 may preferably be a green laser diode to emit a third color light L3 with a green light color, but this is not limited to this, and the color light types may vary according to the actual light combination application of the laser projection device 10.

The focusing lens 14 may preferably be a collimating lens (but not limited thereto) having a first lens portion 32 and a second lens portion 34, so as to collimate and focus the first color light L1, the second color light L2 and the third color light L3. In addition, in this embodiment, the refraction unit 16 may include a reflective sheet 36 and a color separation sheet 38. The refraction sheet 36 may be relatively tiltedly disposed at a position opposite to the plurality of first color light units 26 on the incident axis I of the first lens portion 32 (preferably, the tilt angle of the refraction sheet 36 relative to the incident axis I is equal to 45°, but not limited thereto), so as to reflect the first color light L1 to travel along the incident axis I. The color separation film 38 can be relatively tiltedly arranged at a position opposite to the second color light unit 28 and the third color light unit 30 on the incident light axis I (preferably, the tilt angle of the color separation film 38 relative to the incident light axis I is equal to 45°, but not limited to this), so as to reflect the second color light L2 and the third color light L3 along the incident light axis I and allow the first color light L1 to penetrate, so that the first color light L1, the second color light L2 and the third color light L3 can be combined along the incident light axis I and pass through the first lens portion 32, thereby producing an effect of causing the light beam that has been superimposed with the colors to be incident on the reflective diffuser 18.

In terms of the design of the reflective diffuser 18, as can be seen from Figure 2, the reflective diffuser 18 is arranged on one side of the focusing lens 14, and is used to receive the first color light L1, the second color light L2 and the third color light L3 transmitted from the first lens portion 28 to diffuse and uniformize the energy and directivity of the first color light L1, the second color light L2 and the third color light L3, and reflect the first color light L1, the second color light L2 and the third color light L3 to the second lens portion 34 so that the first color light L1, the second color light L2 and the third color light L3 travel along the light output axis O of the second lens portion 34. More specifically, in this embodiment, the reflective diffuser 18 may include a reflective sheet 40 and a haze diffusion layer 42, the haze diffusion layer 42 is formed by processing (e.g., metal bump) or attached or coated on the reflective sheet 40, so that the first color light L1, the second color light L2 and the third color light L3 can pass through the second lens portion 34 after being homogenized and reflected by the reflective diffuser 18, wherein the reflective sheet 40 is preferably a metal plate or a reflector, and the haze of the haze diffusion layer 42 is preferably greater than 1.5 (but not limited thereto). In addition, the present invention may adopt a design in which the reflective diffuser is movably disposed on one side of the focusing lens to further enhance the diffuse reflection effect of the reflective diffuser and produce an effect of preventing the reflective diffuser from overheating. For example, the reflective diffuser 18 shown in FIG. 2 may reciprocate relative to the focusing lens 14 (e.g., move left and right along the horizontal direction of FIG. 2, but not limited thereto), or in another embodiment, the reflective diffuser 18 may be a diffusion wheel to rotate relative to the focusing lens 14.

In actual applications, the laser projection device 10 may be additionally provided with a diffuser to further diffuse and uniformize the energy and directivity of the first color light L1, the second color light L2 and the third color light L3. For example, the laser projection device 10 may further include at least one diffuser 44 (which may preferably rotate or reciprocate relative to the focusing lens 14, but is not limited thereto). For example, four diffusers 44 are shown in FIG. 2 , which are respectively arranged between the first color light unit 26 and the refractive plate 36, between the second color light unit 28 and the third color light unit 30 and the color separation plate 38, between the refractive unit 16 and the first lens portion 32, and between the second lens portion 34 and the first lens array 20, but are not limited thereto. The relevant quantity configuration changes depend on the actual application of the laser projection device 10.

Regarding the design of the first lens array 20, please refer to FIG. 2, FIG. 3 and FIG. 4, FIG. 3 is a schematic diagram of the size ratio of the first lens array 20 and the focusing lens 14 of FIG. 2, and FIG. 4 is a simplified front view of the first lens array 20 of FIG. 2. As can be seen from FIG. 2, FIG. 3 and FIG. 4, the first lens array 20 can be disposed at a position corresponding to the second lens portion 34 to receive the first color light L1, the second color light L2 and the third color light L3 transmitted from the second lens portion 34 along the light output axis O to perform color light superposition, thereby producing light beam splitting, beam shaping and spot superposition effects. More specifically, in this embodiment, the length L of the first lens array 20 along the first central axis C1 of the condenser lens 14 is preferably equal to half of the diameter D of the condenser lens 14 (as shown in FIG. 3 (a), but not limited thereto, and the length L can also be less than half of the diameter D of the condenser lens 14), and the width W of the first lens array 20 along the second central axis C2 of the condenser lens 14 is preferably equal to the diameter D of the condenser lens 14 (as shown in FIG. 3 (b), but not limited thereto, and the width W can also be less than half of the diameter D of the condenser lens 14). W is smaller than the diameter D of the focusing lens 14), that is, the aspect ratio of the first lens array 20 can be preferably 0.5, wherein the first central axis C1 of the focusing lens 14 can preferably intersect and be perpendicular to the light incident axis I and the light exit axis O (as shown in FIG. 2 , but not limited thereto, the first central axis C1 can also be perpendicular to the light incident axis I and the light exit axis O in a non-intersecting manner (which means that the first lens array 20 can be arranged in a tilted manner relative to the focusing lens 14)), and the second central axis C2 of the focusing lens is perpendicular to the first central axis C1.

In addition, as can be seen from FIG. 2 , the imaging module 22 is disposed on the light-emitting axis O to receive the first color light L1, the second color light L2, and the third color light L3 transmitted from the first lens array 20 to form a projection light beam B, and the projection lens 24 can receive the projection light beam B transmitted from the imaging module 22 for optical projection. More specifically, in this embodiment, the imaging module 22 may include at least one relay lens 46 (two are shown in FIG. 2 , but not limited thereto), a first right-angle prism 48, an imaging element 50, and a second right-angle prism 52. The relay lens 46 is disposed on the light-emitting axis O to amplify and transmit the first color light L1, the second color light L2, and the third color light L3 transmitted from the first lens array 20. The first right-angle prism 48 and the second right-angle prism 52 are disposed on the light-emitting axis O and are opposite to each other. The imaging element 50 may preferably be a digital micromirror device (Digital Micromirror Device, DMD) and is located on one side of the first right-angle prism 48, whereby the first right-angle prism 48 can reflect the first color light L1, the second color light L2 and the third color light L3 transmitted from the relay lens 46 to the imaging element 50, and then the imaging element 50 can optically reflect and image the first color light L1, the second color light L2 and the third color light L3 to form a projection beam B, so that the projection beam B can pass through the first right-angle prism 48 and the second right-angle prism 52 in sequence and be incident on the projection lens 24, thereby providing the subsequent laser projection device 10 with a multi-color laser beam required for projection imaging, wherein as shown in FIG. 2, the projection beam B can have an elliptical laser spot 25 in the projection lens 24.

In summary, by reducing the length of the first lens array to less than or equal to half of the diameter of the focusing lens and the width of the first lens array to less than or equal to the diameter of the focusing lens, the present invention can produce an elliptical spot size reduction effect in which the laser spot projected by the projection light beam in the projection lens is elliptical. In this way, compared with the symmetrical circular design of the laser spot adopted in the prior art, the present invention can not only reduce the impact on the laser light utilization efficiency of the laser projection device when adopting the design of reducing the projection lens diameter to reduce the overall volume of the laser projection device, but also improve the flexibility of the laser projection device in the selection of lens size.

It is worth mentioning that the lens array structure configuration adopted by the present invention is not limited to the above-mentioned embodiments. For example, please refer to Figures 5 and 6. Figure 5 is a side view schematic diagram of a laser projection device 10' proposed according to another embodiment of the present invention, and Figure 6 is a front view schematic diagram of the first lens array 20 and the second lens array 20' of Figure 5. The elements mentioned in this embodiment and the above-mentioned embodiments have the same number, which represents the same or similar structure and function, and will not be repeated here. As shown in Figures 5 and 6, the laser projection device 10' includes a laser light source group 12, a focusing lens 14, a refractive unit 16, a reflective diffuser 18, a first lens array 20, an imaging module 22, a projection lens 24, and a second lens array 20'. The second lens array 20' is connected to the first lens array 20 (preferably in an integrally formed manner or in a structurally fitted/clamped manner, but not limited thereto, and the first lens array 20 and the second lens array 20' may also be separately arranged) and is arranged on the incident light axis I to be located between the first lens portion 32 and the refraction unit 16 to receive the first color light L1, the second color light L2 and the third color light L3 transmitted from the refraction unit 16 along the incident light axis I for color light superposition, thereby generating light beam splitting, beam shaping and spot superposition effects, thereby The light utilization efficiency of the laser projection device 10' is improved, wherein the size of the microlenses on the second lens array 20' can be preferably smaller than the size of the microlenses on the first lens array 20, and the number of microlenses on the second lens array 20' can be preferably greater than the number of microlenses on the first lens array 20 (for example, the size of each microlens 21' of the second lens array 20' shown in FIG. 6 is smaller than the size of each microlens 21 of the first lens array 20, and the number of microlenses 21' can also be further greater than the number of microlenses 21, but not limited thereto). As for other related descriptions of the laser projection device 10' (such as the design of adding a diffusion sheet 44, etc.), they can be referred to the above implementation by analogy, and will not be repeated here.

In addition, the laser light source configuration adopted by the present invention is not limited to the multi-color light source configuration proposed in the above-mentioned embodiment, and a monochromatic laser light source configuration may also be adopted. For example, please refer to FIG. 7, which is a side view schematic diagram of a laser projection device 10" proposed in accordance with another embodiment of the present invention. In this embodiment, the elements mentioned in the above-mentioned embodiment have the same numbering as those in the above-mentioned embodiment, which represent the same or similar structures and functions, and will not be repeated here. As shown in FIG. 7, the laser projection device 10" includes a laser light source group 12', a focusing lens 14, a reflective diffuser 18, a first lens array 20, an imaging module 22, a projection lens 24, and a refractive unit 16'. As shown in FIG. 7 , in this embodiment, the laser light source group 12 ′ may only include a first color light unit 26 (but not limited thereto, the type of color light selected depends on the actual application of the laser projection device 10 ″), and the refractive unit 16 ′ includes a reflective sheet 36 ′, which is relatively tiltedly arranged on the incident light axis I to reflect the first color light L1 to the first lens portion 32. In this way, through the focusing of the focusing lens 14, the diffusion and homogenization of the reflective diffuser 18, the color light superposition of the first lens array 20, and the light beam imaging of the imaging module 22, the projection lens 24 can receive the monochromatic projection light beam B ′ transmitted from the imaging module 22 for optical projection, wherein as shown in FIG. 7 , the projection light beam B ′ may have an elliptical monochromatic laser spot 25 ′ in the projection lens 24. As for other related descriptions of the laser projection device 10 ″ (such as the design of adding a diffuser 44, etc.), they can be referred to the above-mentioned implementation by analogy, and will not be repeated here.

In addition, the prism design adopted in the present invention is not limited to the double prism design mentioned in the above embodiment. It can also adopt a single right-angle prism design to achieve the effect of reducing the overall volume of the imaging module, which is beneficial to the miniaturization design of the laser projection device. For example, please refer to Figure 8, which is a side view schematic diagram of a laser projection device 10"' proposed according to another embodiment of the present invention. The elements in this embodiment have the same number as those mentioned in the above embodiment, which represent the same or similar structures and functions, and will not be repeated here. As shown in Figure 8, the laser projection device 10"' includes a laser light source group 12, a focusing lens 14, a refractive unit 16, a reflective diffuser 18, a first lens array 20, a projection lens 24, and an imaging module 22'. As shown in FIG8 , in this embodiment, the imaging module 22′ includes at least one relay lens 46 (two are shown in FIG8 , but not limited thereto), an imaging element 50, and a right-angle prism 54. The imaging element 50 is disposed on the light-emitting axis O, and the right-angle prism 54 is disposed on the light-emitting axis O and is located between the relay lens 46 and the imaging element 50. Thus, the right-angle prism 54 allows the first color light L1, the second color light L2, and the third color light L3 transmitted from the relay lens 46 to penetrate into the imaging element 50. Then, the imaging element 50 can perform optical reflection imaging on the first color light L1, the second color light L2, and the third color light L3, and the right-angle prism 54 reflects the projection light beam B transmitted back by the imaging element 50 to the projection lens 24, thereby providing the multi-color laser beam required for the subsequent laser projection device 10′″ to perform projection imaging. As for other related descriptions of the laser projection device 10′″ (such as the design of adding a diffusion sheet 44, etc.), they can be referred to the above-mentioned implementation by analogy, and will not be repeated here.

It should be noted that the above-mentioned color light unit quantity configuration (multi-color or single color light configuration), lens array additional configuration, and prism quantity configuration (double prism configuration opposite to each other or single right-angle prism configuration) can be selectively applied interactively to enhance the design flexibility of the laser projection device of the present invention in the configuration of optical elements. For example, in an embodiment using a monochromatic laser light source configuration, the laser projection device of the present invention can further adopt a lens array additional configuration to enhance the utilization efficiency of the monochromatic light of the laser projection device. As for other derived variation embodiments (such as embodiments using both a lens array additional configuration and a single right-angle prism configuration), the relevant descriptions can be deduced by analogy and will not be repeated here.

Although the present invention is described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify the preferred embodiments of the present invention and should not be construed as limiting the present invention. In order to clearly describe the required components, the proportions in the schematic drawings do not represent the proportional relationship of the actual components.

The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims (15)

1. A laser projection device, comprising:

a laser light source group comprising a plurality of first color light units which are sequentially arranged, wherein the plurality of first color light units emit first color light;

a condenser lens having a first lens portion and a second lens portion;

The refraction unit is obliquely arranged on the light incidence axis of the first lens part relative to the condensing lens and is opposite to the plurality of first color light units, and is used for reflecting the first color light to be incident to the first lens part along the light incidence axis;

The reflective diffusion piece is arranged on one side of the condensing lens and is used for receiving the first color light transmitted from the first lens part and reflecting the first color light to the second lens part, so that the first color light travels along the outgoing optical axis of the second lens part, the first circle center axis of the condensing lens is respectively vertical to the incoming optical axis and the outgoing optical axis, and the second circle center axis of the condensing lens is vertical to the first circle center axis;

The first lens array is arranged on the light-emitting axis and is used for receiving the first color light transmitted from the second lens part, the length of the first lens array along the first round spindle is less than or equal to one half of the diameter of the condensing lens, and the width of the first lens array along the second round spindle is less than or equal to the diameter of the condensing lens;

The imaging module is arranged on the light-emitting axis and is used for receiving the first color light transmitted from the first lens array to form a projection beam; and

The projection lens receives the projection beam transmitted from the imaging module to perform optical projection.

2. The laser projection device of claim 1, further comprising:

the second lens array is connected with the first lens array and arranged on the incident optical axis to be positioned between the first lens part and the refraction unit and used for receiving the first color light;

Wherein the size of the microlenses on the second lens array is smaller than the size of the microlenses on the first lens array.

3. The laser projection device of claim 2, wherein the number of microlenses on the second lens array is greater than the number of microlenses on the first lens array.

4. The laser projection device of claim 1, further comprising:

The diffusion sheet is arranged between the laser light source group and the refraction unit, between the refraction unit and the first lens part and at least one position between the second lens part and the first lens array.

5. The laser projection device of claim 4, wherein the diffuser rotates or reciprocates relative to the condenser lens.

6. The laser projection device as claimed in claim 1, wherein the reflective diffuser comprises a reflective sheet and a haze diffusion layer, the haze diffusion layer is formed on or attached to or coated on the reflective sheet, and the first color light passes through the second lens portion after being homogenized and reflected by the reflective diffuser.

7. The laser projection device of claim 1, wherein the reflective diffuser is movably or rotatably disposed on the side of the condenser lens.

8. The laser projection device as claimed in claim 1, wherein the refraction unit includes a reflection sheet obliquely disposed on the incident optical axis to reflect the first color light to the first lens portion.

9. The laser projection device as claimed in claim 8, wherein the laser light source set further comprises a plurality of second color light units and a plurality of third color lights arranged in sequence, the plurality of second color light units and the plurality of third color light units are adjacent to the plurality of first color light units and respectively emit second color light and third color light, and the refraction unit further comprises a color separation film; the color separation film is obliquely arranged on the incident axis relative to the first lens part and is opposite to the plurality of second color light units and the plurality of third color light units, and is used for reflecting the second color light and the third color light and allowing the first color light to penetrate, and the first color light, the second color light and the third color light penetrate through the first lens part along the incident axis so as to be incident to the reflective diffusion piece, reflected by the reflective diffusion piece and sequentially penetrate through the second lens part and the first lens array.

10. The laser projection device of claim 1, wherein the first color light is red light, the second color light is blue light, and the third color light is green light.

11. The laser projection device of claim 1, wherein the imaging module comprises:

At least one relay lens arranged on the light-emitting axis to receive the first color light transmitted from the first lens array;

the imaging piece is arranged on the light outlet axis; and

The right angle prism is arranged on the light-out axis and between the at least one relay lens and the imaging piece, and is used for allowing the first color light transmitted from the at least one relay lens to penetrate to the imaging piece and reflecting the projection light beam returned by the imaging piece to the projection lens.

12. The laser projection device of claim 1, wherein the imaging module comprises:

At least one relay lens arranged on the light-emitting axis to receive the first color light transmitted from the first lens array;

the first right-angle prism is arranged on the light-out axis and is used for receiving the first color light transmitted from the at least one relay lens to reflect;

An imaging member, located at one side of the first right-angle prism, for receiving the first color light reflected from the first right-angle prism to form the projection beam; and

The second right-angle prism is arranged on the light-out axis and opposite to the first right-angle prism, and is used for allowing the projection light beam transmitted by the imaging piece to penetrate to the projection lens.

13. A laser projection device as claimed in claim 11 or 12, wherein the imaging member is a digital micromirror device.

14. The laser projection device of claim 1, wherein the first center axis of the condensing lens intersects perpendicularly the entrance axis and the exit axis, respectively.

15. The laser projection device of claim 1, wherein the condensing lens is a collimating lens.