Light beam projection equipment and projector thereof

Abstract

The invention provides light beam projection equipment. The light beam projection equipment comprises a condensing lens, a light source, a wavelength conversion element, a digital micro-mirror element, a light guide mirror group and a projection lens, the condenser lens has a lens part and an asymmetric lens part, and the asymmetric lens part is formed by extending from the lens part and has a cut surface. The light source is arranged at a position corresponding to the cut surface. The wavelength conversion element is arranged on one side of the condensing lens, the light source emits colored light, the colored light directly enters the wavelength conversion element, and the wavelength conversion element is used for at least partially carrying out wavelength conversion on the colored light and reflecting the colored light to the condensing lens, so that the colored light advances along the light emitting axis of the lens part. The digital micromirror element is arranged on the other side, opposite to the wavelength conversion element, of the condensing lens. The light guide lens group is arranged on the light emitting axis and is used for guiding the colored light to enter the digital micro-mirror element to form a projection light beam. The projection lens receives the projection light beam for optical projection.

Description

Technical Field

[0001] The present invention relates to the field of light beam projection equipment and projectors thereof, and in particular to a light beam projection equipment and projector thereof in which a cut surface is formed on a focusing lens and a light source is arranged at a position corresponding to the cut surface. Background Art

[0002] Generally speaking, if Figure 1 As shown, conventional beam projection devices 1 used in projectors or automotive lighting typically use a blue laser light source to provide colored light. This colored light is converted into stimulated colored light of other colors by a focusing lens 2 and a wavelength conversion element 3 (e.g., a color wheel partially coated with a phosphor layer). This light is then combined with the original colored light through a light guide lens assembly 4, a digital micromirror device (DMD) 5, and a projection lens 6 to provide the multi-color laser beam required for subsequent projection imaging.

[0003] In the above configuration, since the colored light will produce stray reflection when it enters the internal optical components of the light beam projection device 1, unintended and unnecessary light leakage paths P (such as Figure 1 As shown in FIG, the light leakage problem is caused, thereby greatly affecting the image projection or lighting quality of the light beam projection device 1. In the prior art, the light leakage problem can be solved by blocking the position of the light beam projection device 1 corresponding to the light leakage path P (for example, Figure 1 The problem is solved by disposing a light blocking sheet or the like at the bottom front of the projection lens 6 as shown. However, this light blocking design will also cause the overall brightness of the light beam projection device 1 to decrease.

[0004] Therefore, it is necessary to design a novel light beam projection device and projector thereof to overcome the above-mentioned defects. Summary of the Invention

[0005] The object of the present invention is to provide a light beam projection device and a projector thereof, in which a cut surface is formed on a focusing lens and a light source is arranged at a position corresponding to the cut surface. The light beam projection device effectively solves the light leakage problem caused by the stray reflection of colored light mentioned in the prior art, thereby improving the image projection or lighting quality of the light beam projection device and facilitating a thin design of the light beam projection device.

[0006] To achieve the above-mentioned object, the present invention provides a light beam projection device and a projector thereof. The light beam projection device includes at least one condenser lens having a lens portion and an asymmetric lens portion, the asymmetric lens portion extending from the lens portion and having a cross-section;

[0007] At least one light source is disposed at a position corresponding to the cut surface;

[0008] a wavelength conversion element disposed on one side of the focusing lens; wherein the light source emits colored light, the colored light is directly incident on the wavelength conversion element, the wavelength conversion element is configured to at least partially convert the wavelength of the colored light and reflect the colored light toward the focusing lens, causing the colored light to travel along the light output axis of the lens portion;

[0009] A digital micromirror element is disposed on the other side of the focusing lens relative to the wavelength conversion element;

[0010] a light guide mirror assembly, disposed on the light output axis, for guiding the color light to be incident on the digital micromirror device to form a projection light beam; and

[0011] At least one projection lens receives the projection light beam to perform optical projection.

[0012] Preferably, the distance between the cut surface and the central axis of the lens portion is no greater than three quarters of the radius of the lens portion.

[0013] Preferably, the included angle between the cut surface and the central axis of the lens portion is between 0° and 60°.

[0014] Preferably, the light source and the digital micromirror device are respectively located on both sides of the light output axis, and the light guide mirror assembly includes a reflective concave mirror, which is arranged on the light output axis to guide the color light to be incident on the digital micromirror device.

[0015] Preferably, the light source and the digital micromirror device are located on the same side of the light output axis, and the light guide mirror assembly includes a reflective concave mirror, which is arranged on the light output axis to guide the color light to be incident on the digital micromirror device.

[0016] Preferably, the light guide lens assembly includes at least one illumination lens, a first triangular prism, and a second triangular prism; the illumination lens is disposed on the light-emitting axis and located between the focusing lens and the first triangular prism; the first triangular prism is disposed on the light-emitting axis and reflects the color light transmitted from the illumination lens to the second triangular prism; the second triangular prism and the first triangular prism are opposite to each other and disposed on the light-emitting axis to allow the color light reflected from the first triangular prism to penetrate and be incident on the digital micromirror device, and to reflect the projection light beam transmitted back by the digital micromirror device to the projection lens.

[0017] Preferably, the light beam projection device further comprises:

[0018] The light blocking sheet is opposite to the cut surface to block the color light from being incident on the condensing lens from the cut surface.

[0019] Preferably, the light beam projection device further comprises:

[0020] a diffuser disposed between the wavelength conversion element and the light source;

[0021] a light homogenizing element disposed between the wavelength conversion element and the light source, wherein the light homogenizing element is a lens array;

[0022] a dimming element disposed between the wavelength conversion element and the light source, for focusing the color light, diverging the color light, changing the beam size of the color light, or changing the traveling direction of the color light; and

[0023] The heat dissipation substrate carries the focusing lens and the wavelength conversion element.

[0024] Preferably, the wavelength conversion element includes at least one fluorescent layer, and the color light is incident on the fluorescent layer to undergo wavelength conversion.

[0025] Preferably, the wavelength conversion element is a fluorescent color wheel, which includes the fluorescent layer and is rotatably disposed on one side of the focusing lens;

[0026] The fluorescent color wheel further includes a reflective layer, and the color light is incident on the reflective layer to be reflected to the focusing lens.

[0027] Preferably, the focusing lens is a collimating lens, and the light source is a laser light source or a light emitting diode light source;

[0028] The fluorescent layer is a yellow fluorescent powder layer, the colored light is blue light, and the fluorescent layer converts the colored light into yellow light to mix with the colored light to form white light; or, the fluorescent layer is a red and green fluorescent powder layer, the colored light is blue light, and the fluorescent layer converts the colored light into red light and green light to mix with the colored light to form white light.

[0029] Preferably, the light beam projection device further comprises:

[0030] Another light source is disposed on the other side of the wavelength conversion element relative to the condenser lens, and is used for emitting another color light to the wavelength conversion element so as to at least partially convert the wavelength of the other color light.

[0031] Preferably, a projector comprises:

[0032] At least one focusing lens having a lens portion and an asymmetric lens portion, wherein the asymmetric lens portion is extended from the lens portion and has a cross-section;

[0033] At least one light source is disposed at a position corresponding to the cut surface;

[0034] a wavelength conversion element disposed on one side of the focusing lens; wherein the light source emits colored light, and the colored light is directly incident on the wavelength conversion element, the wavelength conversion element is configured to at least partially convert the wavelength of the colored light and reflect the colored light toward the focusing lens, causing the colored light to travel along the light output axis of the lens portion;

[0035] A digital micromirror element is disposed on the other side of the focusing lens relative to the wavelength conversion element;

[0036] a light guide mirror assembly, disposed on the light output axis, for guiding the color light to be incident on the digital micromirror device to form a projection light beam; and

[0037] At least one projection lens receives the projection light beam to perform optical projection.

[0038] Compared to the prior art's light-blocking design of directly using a light-blocking sheet to block the light leakage path, the present invention adopts the above-mentioned lens cut-off surface design to remove the area on the focusing lens that will produce the light leakage path. In this way, the present invention can effectively solve the light leakage problem caused by the stray reflection of colored light mentioned in the prior art, thereby greatly improving the image projection or lighting quality of the light beam projection device. In addition, the present invention also correspondingly adopts a design of setting the light source at the corresponding cut-off surface position to improve the internal space utilization efficiency of the light beam projection device and facilitate the thin design of the light beam projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A simplified side view of a beam projection device in the prior art.

[0040] Figure 2 FIG. 1 is a simplified side view of a light beam projection device according to an embodiment of the present invention.

[0041] Figure 3 for Figure 2 Top view of the condenser lens.

[0042] Figure 4 FIG2 is a simplified side view of a light beam projection device according to another embodiment of the present invention.

[0043] Figure 5 FIG2 is a simplified side view of a light beam projection device according to another embodiment of the present invention.

[0044] Figure 6 FIG2 is a simplified side view of a light beam projection device according to another embodiment of the present invention.

[0045] Figure 7 for Figure 6 An enlarged schematic diagram of the color wheel of the wavelength conversion element. DETAILED DESCRIPTION

[0046] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the present invention is described in detail below with reference to the embodiments.

[0047] Certain terms are used throughout the specification and claims to refer to specific components. Those skilled in the art will understand that manufacturers may use different terms to refer to the same component. This specification and claims do not distinguish components by name, but rather by their functional differences. Throughout the specification and claims, the term "including" is open-ended and should be interpreted as meaning "including, but not limited to."

[0048] See also Figure 2 as well as Figure 3 , Figure 2 FIG. 1 is a simplified side view of a light beam projection device 10 according to an embodiment of the present invention. Figure 3 for Figure 2 The light beam projection device 10 can be preferably used in the light beam projection of vehicle lighting to provide a projection light beam and be used as a vehicle lamp, or can be used in projection imaging to provide a projection light beam and be used as a projector (but not limited thereto), such as Figure 2 As shown, the light beam projection device 10 includes at least one focusing lens 12 (at Figure 2 Two are shown, but not limited thereto), at least one light source 14 (at Figure 2 , a wavelength conversion element 16, a digital micromirror device 18, a light guide lens assembly 20, and at least one projection lens 22 (shown in FIG. Figure 2 (Six are shown in the example, but not limited to this).

[0049] The focusing lens 12 can be preferably a collimator lens (but not limited thereto) and has a lens portion 24 and an asymmetric lens portion 26. The asymmetric lens portion 26 is formed by extending from the lens portion 24 and having a cross section S for collimating and focusing the color light emitted by the light source 14. Figure 2 as well as Figure 3 It can be seen that in this embodiment, the distance D between the cut surface S and the central axis C of the lens portion 24 is preferably no greater than three-quarters of the radius R of the lens portion 24, and the angle θ between the cut surface S and the central axis C of the lens portion 24 is preferably between 0° and 60°. However, the present invention is not limited to this. That is, the position of the cut surface S and the angle of the cut surface S relative to the central axis C of the lens portion 24 can be varied according to the actual light leakage path of the light beam projection device 10. In addition, the light beam projection device 10 can further include a light shield 28. The light shield 28 and the cut surface S are opposite to each other to block the light emitted by the light source 14 from entering the cut surface S, thereby preventing the light beam projection device 10 from causing additional light scattering and leakage due to the formation of the cut surface S.

[0050] The light source 14 is disposed at a position corresponding to the cut surface S and emits the colored light L which is directly incident on the wavelength conversion element 16 without passing through the asymmetric lens portion 26. The wavelength conversion element 16 is disposed on one side of the condenser lens 12 to at least partially convert the wavelength of the colored light L and reflect the colored light L to the condenser lens 12, so that the colored light L travels along the light output axis O of the lens portion 24. More specifically, in this embodiment, the wavelength conversion element 16 may include at least one fluorescent layer 17 (on the Figure 2 A layer is shown in the figure, but not limited thereto), so that the colored light L is incident on the fluorescent layer 17 and is excited to produce a wavelength conversion phenomenon. For example, the light source 14 can preferably be a laser light source or a light-emitting diode light source to emit a colored light L with a blue light color, and the fluorescent layer 17 can be a yellow phosphor layer correspondingly, whereby the fluorescent layer 17 can convert the colored light L into yellow light to be mixed with the reflected colored light L into white light, or the fluorescent layer 17 can be a red and green phosphor layer, whereby the fluorescent layer 17 can convert the colored light L into red and green light to be mixed with the reflected colored light L into white light, but not limited thereto, and the type of colored light and the type of color of the fluorescent layer can vary according to the actual optical projection requirements of the light beam projection device 10. It should be noted that in this embodiment, the present invention can adopt a design in which the wavelength conversion element 16 is movably arranged on one side of the focusing lens 12, so as to further enhance the colored light excitation effect of the wavelength conversion element 16 and produce an effect of preventing the wavelength conversion element 16 from overheating. For example, as Figure 2 The wavelength conversion element 16 shown can be reciprocated relative to the focusing lens 12 (e.g., along Figure 2 Alternatively, in another embodiment, the wavelength conversion element 16 may be a fluorescent color wheel that rotates relative to the focusing lens 12 .

[0051] In addition, if Figure 2 As shown, the DMD 18 is disposed on the other side of the focusing lens 12 relative to the wavelength conversion element 16. The light guide lens assembly 20 is disposed on the optical output axis O to guide the color light L to enter the DMD 18 to form a projection beam B. The projection lens 22 can receive the projection beam B for optical projection. More specifically, in this embodiment, the DMD 18 can preferably be a digital micro-mirror device. The light source 14 and the DMD 18 can be located on either side of the optical output axis O. The light guide lens assembly 20 can include a reflective concave mirror 30 disposed on the optical output axis O. The reflective concave mirror 30 can reflect the color light, which has been wavelength-converted and combined by the wavelength conversion element 16 and travels along the optical output axis O of the lens portion 24, to the DMD 18. The DMD 18 then optically reflects the received color light to form a projection beam B. The projection beam B can then pass through the projection lens 22, thereby providing the multi-color laser beam required for subsequent optical projection by the beam projection apparatus 10.

[0052] In summary, compared to the prior art light-blocking design of directly using a light-blocking sheet to block the light leakage path, the present invention adopts the above-mentioned lens cut-off surface design to remove the area on the focusing lens that will produce the light leakage path. In this way, the present invention can effectively solve the light leakage problem caused by the stray reflection of colored light mentioned in the prior art, thereby greatly improving the image projection or lighting quality of the light beam projection device. In addition, the present invention also correspondingly adopts a design of setting the light source at the corresponding cut-off surface position to improve the internal space utilization efficiency of the light beam projection device and facilitate the thin design of the light beam projection device.

[0053] In actual applications, the light beam projection device 10 may additionally be provided with a diffuser, a homogenizing element (preferably a lens array, but not limited thereto), or a dimming element (such as a reflector, a convex / concave lens, etc.) between the light source 14 and the wavelength conversion element 16. In this way, the configuration of the diffuser can further diffuse and homogenize the energy and directionality of the colored light L. The configuration of the homogenizing element can be used to receive the colored light L transmitted from the light source 14 for color light superposition, thereby producing light beam splitting, beam shaping, and spot superposition effects, and the configuration of the dimming element can be used to focus the colored light L, diverge the colored light L, change the beam size of the colored light L, or change the direction of travel of the colored light L. As for which configuration or any combination thereof to adopt, it can be determined according to the actual optical projection requirements of the light beam projection device 10. In addition, the light beam projection device 10 may include a heat dissipation substrate 32 (on Figure 2 (Simplified by the dotted box in the figure), the heat dissipation substrate 32 can simultaneously carry the focusing lens 12 and the wavelength conversion element 16. In this way, not only can the internal heat dissipation efficiency of the light beam projection device 10 be improved through the configuration of the heat dissipation substrate 32, but also a heat dissipation modular effect can be achieved, thereby further reducing the space occupied by the internal components of the light beam projection device 10 and facilitating the thin design of the light beam projection device 10.

[0054] In addition, the light beam projection device 10 may include another light source disposed on the other side of the wavelength conversion element 16 relative to the focusing lens 12, for emitting another color light (such as blue light, but not limited to) to the wavelength conversion element 16 to at least partially convert the wavelength of this color light, thereby further improving the projection brightness of the light beam projection device 10.

[0055] It is worth mentioning that, in addition to the above-mentioned design of arranging the light source and the digital micromirror device on opposite sides of the light-emitting axis of the focusing lens, the present invention can also adopt a design of arranging the light source and the digital micromirror device on the same side of the light-emitting axis. For example, see Figure 4, which is a schematic side view of a beam projection device 100 according to another embodiment of the present invention. Components with the same numbers as those in the above embodiments represent the same or similar structures and functions, and are not described in detail herein. Figure 4 As shown, the light beam projection device 100 includes a focusing lens 12, at least one light source 102 (at Figure 4 ), a wavelength conversion element 16, a digital micromirror device 18, a light guide lens assembly 104, and a projection lens 22. In this embodiment, the light guide lens assembly 104 includes a reflective concave mirror 106. The light source 102 and the digital micromirror device 18 are located on the same side of the light output axis O, and the reflective concave mirror 106 is disposed on the light output axis O. Thus, the color light L emitted by the light source 102 can directly enter the wavelength conversion element 16 without passing through the asymmetric lens portion 26 to undergo at least partial wavelength conversion. The light L is then reflected by the wavelength conversion element 16 to the focusing lens 12, causing the color light L to travel along the light output axis O of the lens portion 24. The light L is then guided by the reflective concave mirror 106 to enter the digital micromirror device 18 to form a projection beam B. At the same time, the projection lens 22 can receive the projection beam B for optical projection. As for other related descriptions of the light beam projection device 100 (such as the design of adding a diffuser / light homogenizing element / light modulating element / heat dissipation substrate / another light source, etc.), they can be deduced by reference to the above implementation and will not be repeated here.

[0056] In addition, the present invention can also adopt a double prism light guide configuration, for example, see Figure 5 , which is a schematic side view of a beam projection device 150 according to another embodiment of the present invention. Components with the same numbers as those in the above embodiments represent the same or similar structures and functions, and are not described in detail here. Figure 5 As shown, the light beam projection device 150 includes a focusing lens 12, a light source 14, a wavelength conversion element 16, a digital micromirror device 18, a light guide lens assembly 152, and a projection lens 22. In this embodiment, the light guide lens assembly 152 includes at least one illumination lens 154 (at Figure 5The first triangular prism 156 and the second triangular prism 158 are respectively provided. The illumination lens 154 is disposed on the light-emitting axis O and between the focusing lens 12 and the first triangular prism 156. The first triangular prism 156 is disposed on the light-emitting axis O and reflects the color light L transmitted from the illumination lens 154 to the second triangular prism 158. The second triangular prism 158 and the first triangular prism 158 are opposite to each other and disposed on the light-emitting axis O, allowing the color light L reflected from the first triangular prism 156 to pass through and enter the digital micromirror device 18, and reflect the projection light beam B returned by the digital micromirror device 18 to the projection lens 22. In this way, the projection lens 22 can receive the projection light beam B transmitted from the light guide lens assembly 152 for optical projection. Other related descriptions of the light beam projection device 150 (such as the design of the additional diffuser / light homogenizer / light modulating element / heat dissipation substrate / another light source, etc.) can be analogized with the above-mentioned embodiments and are not further described here.

[0057] In addition to the above-mentioned single-layer fluorescent layer design, the present invention further adopts a rotating fluorescent color wheel design. For example, see Figure 6 as well as Figure 7 , Figure 6 is a simplified side view of a light beam projection device 200 according to another embodiment of the present invention. Figure 7 for Figure 6 Schematic diagram of the color wheel of the wavelength conversion element 202, the components with the same numbers in this embodiment and the above embodiments represent the same or similar structures and functions, and are not repeated here. Figure 6 as well as Figure 7 As shown, the light beam projection device 200 includes a focusing lens 12, a light source 102, a wavelength conversion element 202, a digital micromirror device 18, a light guide lens assembly 104, and a projection lens 22. In this embodiment, the wavelength conversion element 202 is a rotatable fluorescent color wheel and includes at least one fluorescent layer 204 (at Figure 7 The three layers (preferably, but not limited to, red / green / green fluorescent layers) are shown in FIG. 1 and are rotatably disposed on one side of the focusing lens 12. Furthermore, the wavelength conversion element 202 may further include a reflective layer 206. The colored light L is incident on the reflective layer 206 and reflected toward the focusing lens 12. Thus, during the rotation of the fluorescent color wheel, the colored light L emitted by the light source 102 can be converted into red and green light when incident on the fluorescent layer 204. When incident on the reflective layer 206, the colored light L is reflected toward the focusing lens 12 in a wavelength-unchanged manner, thereby mixing with the red and green light converted by the fluorescent layer 204 to form white light for subsequent optical projection. Other related descriptions of the light beam projection device 200 (such as the design of adding a diffuser / light homogenizing element / light modulating element / heat dissipation substrate / another light source, etc.) can be analogized with the above-mentioned embodiments and are not further elaborated here.

[0058] The present invention has been described with reference to the above embodiments. However, the above embodiments are merely exemplary embodiments of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and improvements that do not depart from the spirit and scope of the present invention are intended to be protected by the present invention.

Claims

1. A light beam projection device, characterized in that: Include: At least one focusing lens having a lens portion and an asymmetric lens portion, wherein the asymmetric lens portion is extended from the lens portion and has a cross-section; At least one light source is disposed at a position corresponding to the cut surface; a wavelength conversion element disposed on one side of the focusing lens; wherein the light source emits colored light, the colored light is directly incident on the wavelength conversion element, the wavelength conversion element is configured to at least partially convert the wavelength of the colored light and reflect the colored light toward the focusing lens, causing the colored light to travel along the light output axis of the lens portion; A digital micromirror element is disposed on the other side of the focusing lens relative to the wavelength conversion element; a light guide mirror assembly, disposed on the light output axis, for guiding the color light to be incident on the digital micromirror device to form a projection light beam; and At least one projection lens receives the projection light beam to perform optical projection.

2. The light beam projection device according to claim 1, wherein The distance between the cut surface and the central axis of the lens portion is no greater than three quarters of the radius of the lens portion.

3. The light beam projection device according to claim 1, wherein: The included angle between the cut surface and the central axis of the lens portion is between 0° and 60°.

4. The light beam projection device according to claim 1, wherein: The light source and the digital micromirror element are respectively located on both sides of the light-emitting axis. The light-guiding mirror assembly comprises a reflective concave mirror. The reflective concave mirror is arranged on the light-emitting axis to guide the color light to be incident on the digital micromirror element.

5. The light beam projection device according to claim 1, wherein: The light source and the digital micromirror element are located on the same side of the light-emitting axis. The light-guiding mirror assembly includes a reflective concave mirror. The reflective concave mirror is arranged on the light-emitting axis to guide the color light to be incident on the digital micromirror element.

6. The light beam projection device according to claim 1, wherein: The light guide lens assembly includes at least one illumination lens, a first triangular prism, and a second triangular prism. The illumination lens is disposed on the light-emitting axis and located between the focusing lens and the first triangular prism. The first triangular prism is disposed on the light-emitting axis and reflects the color light transmitted from the illumination lens to the second triangular prism. The second triangular prism is opposite to the first triangular prism and disposed on the light-emitting axis to allow the color light reflected from the first triangular prism to penetrate and be incident on the digital micromirror device, and to reflect the projection light beam transmitted back by the digital micromirror device to the projection lens.

7. The light beam projection device according to claim 1, wherein: Also includes: The light blocking sheet is opposite to the cut surface to block the color light from being incident on the condensing lens from the cut surface.

8. The light beam projection device according to claim 1, wherein: Also includes: a diffuser disposed between the wavelength conversion element and the light source; a light homogenizing element disposed between the wavelength conversion element and the light source, wherein the light homogenizing element is a lens array; a dimming element disposed between the wavelength conversion element and the light source, for focusing the color light, diverging the color light, changing the beam size of the color light, or changing the traveling direction of the color light; and The heat dissipation substrate carries the focusing lens and the wavelength conversion element.

9. The light beam projection device according to claim 1, wherein: The wavelength conversion element includes at least one fluorescent layer, and the color light is incident on the fluorescent layer to perform wavelength conversion.

10. The light beam projection device according to claim 9, wherein: The wavelength conversion element is a fluorescent color wheel, which includes the fluorescent layer and is rotatably disposed on one side of the focusing lens; The fluorescent color wheel further includes a reflective layer, and the color light is incident on the reflective layer to be reflected to the focusing lens.

11. The light beam projection device according to claim 10, wherein: The focusing lens is a collimating lens, and the light source is a laser light source or a light emitting diode light source; The fluorescent layer is a yellow fluorescent powder layer, the colored light is blue light, and the fluorescent layer converts the colored light into yellow light to mix with the colored light to form white light; or, the fluorescent layer is a red and green fluorescent powder layer, the colored light is blue light, and the fluorescent layer converts the colored light into red light and green light to mix with the colored light to form white light.

12. The light beam projection device according to claim 1, wherein: Also includes: Another light source is disposed on the other side of the wavelength conversion element relative to the condenser lens, and is used for emitting another color light to the wavelength conversion element so as to at least partially convert the wavelength of the other color light.

13. A projector, characterized in that: include: At least one focusing lens having a lens portion and an asymmetric lens portion, wherein the asymmetric lens portion is extended from the lens portion and has a cross-section; At least one light source is disposed at a position corresponding to the cut surface; a wavelength conversion element disposed on one side of the focusing lens; wherein the light source emits colored light, and the colored light is directly incident on the wavelength conversion element, the wavelength conversion element is configured to at least partially convert the wavelength of the colored light and reflect the colored light toward the focusing lens, causing the colored light to travel along the light output axis of the lens portion; A digital micromirror element is disposed on the other side of the focusing lens relative to the wavelength conversion element; a light guide mirror assembly, disposed on the light output axis, for guiding the color light to be incident on the digital micromirror device to form a projection light beam; and At least one projection lens receives the projection light beam to perform optical projection.

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