Laser optical system and projector

Abstract

The invention discloses a laser optical system and a projector, and relates to the technical field of laser optical systems.The laser optical system comprises a light source assembly, the light source assembly comprises a light emitting component and a light combining component, and the light emitting component comprises at least two lasers; the light combining component comprises at least one light combining element, and the light combining element is arranged on a light emitting path of one laser and used for reflecting a light beam emitted by the laser so that the light emitting component can emit the light beam in the first direction. According to the technical scheme, the laser light energy in the laser optical system can be improved, and the projection effect of the projector is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of laser optical systems, and in particular to a laser optical system and a projector. Background Art

[0002] In the related art, the laser optical system of the projector usually uses a laser as a light source. At present, the solution of using a single laser as a light source cannot provide sufficient laser light energy for the laser optical system due to the limited power of the laser, thus affecting the projection effect of the projector. Summary of the invention

[0003] The main purpose of the present invention is to provide a laser optical system and a projector, aiming to improve the laser light energy of the light source component and ensure the projection effect of the projector.

[0004] To achieve the above object, the laser optical system proposed in the present invention includes a light source assembly, wherein the light source assembly includes: A light emitting component, the light emitting component comprising at least two lasers; and A light combining component, wherein the light combining component comprises at least one light combining element, wherein the light combining element is arranged on the light emitting path of one of the lasers and is used for reflecting the light beam emitted by one of the lasers so that the light emitting component emits a light beam along a first direction.

[0005] In one embodiment, the light emitting component includes a first laser and a second laser, the first laser and the second laser are arranged relative to each other in a second direction perpendicular to the first direction, and the light emitting directions of the first laser and the second laser are arranged opposite to each other; The light combining component includes a first light combining element and a second light combining element, which are arranged side by side between the first laser and the second laser, and are used to respectively receive the light beams emitted by the first laser and the second laser, so that the two light beams are transmitted in parallel along the first direction.

[0006] In one embodiment, a first reflective surface is provided on a side of the first light combining element facing the first laser, and the first reflective surface extends obliquely toward the first direction in a direction away from the first laser; A second reflecting surface is provided on a side of the second light combining element facing the second laser. The second reflecting surface extends obliquely in a direction away from the second laser toward the first direction.

[0007] In one embodiment, the light source assembly further includes a third laser, which is located between the two lasers and is used to emit a light beam along the first direction.

[0008] In one embodiment, the first reflecting surface and the second reflecting surface are symmetrically arranged along the first direction; The third laser and the light combining component are staggered along a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0009] In one embodiment, the laser optical system further includes a beam reduction assembly, which extends along the first direction and is located on the light output path of the light source assembly, and is used to reduce the light beam emitted by the light source assembly.

[0010] In one embodiment, the laser optical system further comprises: A light guide assembly, the light guide assembly is arranged on the light output path of the beam reducing assembly, and a first light path and a second light path are formed in the light guide assembly; a fluorescent wheel, disposed in the first light path; and The color filter wheel is arranged on the light output path of the light guide assembly and is used for receiving the light beams emitted along the first light path and the second light path.

[0011] In one embodiment, the light guide assembly comprises: a dichroic mirror, disposed on the light-emitting path of the beam reducing assembly to form a transmitted light beam transmitted along the first light path and a reflected light beam transmitted along the second light path; and A light guiding component is provided in the second light path and is used for guiding the reflected light beam to be transmitted along the second light path toward the color filter wheel.

[0012] In one embodiment, the light guide component comprises: A first reflector, wherein the first reflector is arranged at an interval in the reflection direction of the dichroic mirror, the fluorescent wheel is arranged between the first reflector and one of the dichroic mirrors, and the first reflector is used to receive and reflect the light beam emitted by the fluorescent wheel so that the light beam is transmitted along the first direction; a second reflector, which is disposed in a reflecting direction of the first reflector and is used to receive and reflect the light beam emitted by the first reflector so that the light beam is transmitted along a second direction perpendicular to the first direction; and A third reflector, wherein the third reflector is arranged in the reflecting direction of the second reflector and is arranged opposite to the dichroic mirror along the first direction, and is used for receiving and reflecting the light beam emitted by the second reflector, so that the light beam is transmitted to the dichroic mirror along the first direction, and is transmitted toward the color filter wheel after being reflected by the dichroic mirror.

[0013] The present invention further provides a projector, comprising the laser optical system described in any one of the above, wherein the laser optical system comprises a light source assembly, and the light source assembly comprises: A light emitting component, the light emitting component comprising at least two lasers; and A light combining component, wherein the light combining component comprises at least one light combining element, wherein the light combining element is arranged on the light emitting path of one of the lasers and is used for reflecting the light beam emitted by one of the lasers so that the light emitting component emits a light beam along a first direction.

[0014] The light source assembly of the technical solution of the present invention includes at least two lasers, and the transmission direction of the laser output light beam can be adjusted by the light combining component, so that each laser in the light source assembly can emit light beams in the same direction, thereby achieving the beam combining effect of the light output component, which is conducive to simplifying the optical path design of the laser optical system. Among them, by increasing the number of lasers in the light source assembly, the laser light energy in the laser optical system can be effectively increased to ensure the projection effect of the projector. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 A schematic structural diagram of an embodiment of a laser optical system provided by the present invention; Figure 2 for Figure 1 Schematic diagram of the local structure of the laser optical system; Figure 3 for Figure 1 A cross-sectional view of the laser optical system; Figure 4 for Figure 1 Another partial structural diagram of the laser optical system; Figure 5 for Figure 1 Another cross-sectional view of the laser optical system.

[0017] Description of Figure Numbers: 100, laser optical system; 10, light source assembly; 11, light emitting component; 111, first laser; 112, second laser; 113, third laser; 20, light combining component; 21, first light combining element; 22, second light combining element; 30, beam reducing assembly; 40, light guiding assembly; 41, dichroic mirror; 421, first reflector; 422, second reflector; 423, third reflector; 50, fluorescent wheel; 60, color filter wheel; 70, lens assembly.

[0018] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] In the related art, the laser optical system of the projector usually uses a laser as a light source. At present, the solution of using a single laser as a light source cannot provide sufficient laser light energy for the laser optical system due to the limited power of the laser, thus affecting the projection effect of the projector.

[0023] The present invention provides a laser optical system. Figure 1 The directions indicated by the coordinate system shown in are for reference, wherein the first direction is the positive direction of the x-axis, the second direction is the positive direction of the y-axis; and the third direction is the positive direction of the z-axis.

[0024] See also Figures 1 to 5 In one embodiment of the present invention, the laser optical system 100 includes a light source assembly 10, and the light source assembly 10 includes: A light emitting component 11, wherein the light emitting component 11 comprises at least two lasers; and The light combining component 20 includes at least one light combining element, which is arranged on the light emitting path of one of the lasers and is used to reflect the light beam emitted by one of the lasers so that the light emitting component 11 emits a light beam along a first direction.

[0025] See also Figure 2 In one embodiment of the present invention, the light emitting component 11 includes a first laser 111 and a second laser 112, the first laser 111 and the second laser 112 are arranged relative to each other in a second direction perpendicular to the first direction, and the light emitting directions of the first laser 111 and the second laser 112 are arranged opposite to each other; The light combining component 20 includes a first light combining element 21 and a second light combining element 22, which are arranged side by side between the first laser 111 and the second laser 112, and are used to receive the light beams emitted by the first laser 111 and the second laser 112 respectively, so that the two light beams are transmitted in parallel along the first direction.

[0026] In this embodiment, the light beam emitted by the first laser 111 along the second direction can be transmitted toward the first direction after being reflected by the first reflection surface; similarly, the light beam emitted by the second laser 112 along the second direction can be transmitted toward the first direction after being reflected by the second reflection surface. With such a configuration, the light combining component 20 can combine the light beams emitted by the lasers of the light source assembly 10 to be transmitted in the same direction.

[0027] In some embodiments, the first laser 111 and the second laser 112 can be replaced by a group of lasers, and the number of lasers in each group of lasers can be set to two or more. The present application does not limit the number of lasers in the light source assembly 10.

[0028] See also Figure 2 In one embodiment of the present invention, a first reflecting surface is provided on a side of the first light combining element 21 facing the first laser 111, and the first reflecting surface extends obliquely toward the first direction in a direction away from the first laser 111; a second reflecting surface is provided on a side of the second light combining element 22 facing the second laser 112, and the second reflecting surface extends obliquely toward the first direction in a direction away from the second laser 112.

[0029] In some embodiments, the first light combining element 21 and the second light combining element 22 are plate structures, and a reflective film can be plated on one side of the plate structure to form a first reflective surface and a second reflective surface, respectively. Of course, the light combining component 20 can also be set to other schemes, and the specific implementation method can be set according to actual needs.

[0030] See also Figure 2 In one embodiment of the present invention, the light source assembly 10 further includes a third laser 113, and the third laser 113 is located between the two lasers and is used to emit a light beam along the first direction.

[0031] In some embodiments, the first laser 111, the second laser 112, and the third laser 113 can be used to emit lasers of the same color, such as blue lasers, and the lasers can be modulated into other colors, such as blue, green, and red, through subsequent functional components such as the fluorescent wheel 50. In other embodiments, the first laser 111, the second laser 112, and the third laser 113 can also be used to emit lasers of different colors, respectively. The light combining component 20 can be used to adjust the emission directions of two of the three beams of light emitted by the three lasers so that the three laser beams can be transmitted outward in the same direction.

[0032] See also Figure 2 In one embodiment of the present invention, the first reflecting surface and the second reflecting surface are symmetrically arranged along the first direction; the third laser 113 and the light combining component 20 are staggered along a third direction, and the third direction is perpendicular to the first direction and the second direction.

[0033] Among them, the first reflection surface and the second reflection surface can be set at a 45° inclination relative to the first direction, and are symmetrically arranged along the first direction, so that the light emitted by the first laser 111 and the second laser 112 can be transmitted in parallel along the first direction after reflection. By staggering the third laser 113 and the light combining component 20 in the third direction, the light combining component 20 can avoid the emission path of the third laser 113, so that the light emitted by the third laser 113 can also be transmitted along the first direction. In this way, the transmission paths of the light beams emitted by the first laser 111, the second laser 112 and the third laser 113 can be arranged adjacent to each other, and can all be transmitted along the first direction, which is beneficial to reduce the size of the laser spot emitted by the light source assembly 10.

[0034] See also Figure 2In one embodiment of the present invention, the laser optical system 100 further includes a beam reducing assembly 30, which extends along the first direction and is located on the light emitting path of the light source assembly 10, and is used to reduce the light beam emitted by the light source assembly 10. With such a configuration, the size of the laser spot emitted by the light source assembly 10 can be further reduced, so as to facilitate further modulation of the light beam by subsequent optical components.

[0035] Specifically in this embodiment, the beam reduction assembly 30 can be configured as a transmission-type assembly, so that the light beam can pass through the beam reduction assembly 30 and continue to be transmitted along the first direction. In a feasible implementation, the beam reduction assembly 30 includes a plurality of lenses arranged in sequence along the first direction, and the parallel light beam emitted by the light source assembly 10 can reduce its beam size after passing through the beam reduction assembly 30, thereby increasing the energy density of the laser beam and making the laser beam after beam reduction more in line with the needs of the components in the subsequent optical path.

[0036] Of course, the technical solution of the present invention is not limited thereto. In some embodiments, the beam reduction component 30 may also be configured as a reflective component, which changes the propagation direction of the laser beam while reducing the beam of the laser beam. Of course, the beam reduction component 30 may also be configured as other types, and the specific implementation method may be set according to actual needs and is not limited here.

[0037] See also Figures 2 to 5 In one embodiment of the present invention, the laser optical system 100 further includes: A light guide assembly 40, wherein the light guide assembly 40 is disposed on the light output path of the beam reducing assembly 30, and a first light path and a second light path are formed in the light guide assembly 40; A fluorescent wheel 50 is disposed in the first light path; and The color filter wheel 60 is disposed on the light output path of the light guide assembly 40 and is used to receive the light beams emitted along the first light path and the second light path.

[0038] Specifically, the fluorescent wheel 50 is provided with a fluorescent area along its circumferential direction, wherein the fluorescent wheel 50 can be provided with a fluorescent area in its circumferential direction to output colored light of different colors. Correspondingly, the color filter wheel 60 is provided with a filter area along its circumferential direction to filter the colored light emitted by the fluorescent area. In this way, the color management function of the laser optical system 100 can be realized.

[0039] See also Figures 2 to 5 In one embodiment of the present invention, the light guide assembly 40 includes: A dichroic mirror 41 is disposed on the light output path of the beam reducing assembly 30 to form a transmitted light beam transmitted along the first light path and a reflected light beam transmitted along the second light path; and A light guiding component is provided in the second light path, and is used for guiding the reflected light beam to be transmitted toward the color filter wheel 60 along the second light path.

[0040] Specifically, in this embodiment, the light source assembly 10 is used to emit blue light, and the dichroic mirror 41 can be used to transmit blue light and reflect other colored lights except blue light, so that the blue light can be distinguished from the red light and the green light, and transmitted toward the color filter wheel 60 along different optical paths. Specifically, after the blue light is transmitted to the dichroic mirror 41, it can be reflected to the fluorescent wheel 50 through the dichroic mirror 41 to output as colored lights of different colors. The blue light formed after being modulated by the fluorescent wheel 50 can be retransmitted to the dichroic mirror 41 under the action of the light guide component, and then reflected by the dichroic mirror 41 to the color filter wheel 60; the other colored lights formed by the modulation of the fluorescent wheel 50 can be transmitted through the dichroic mirror 41 and transmitted to the color filter wheel 60.

[0041] See also Figures 2 to 5 In one embodiment of the present invention, the light guide component comprises: A first reflector 421, wherein the first reflector 421 is arranged at intervals in the reflection direction of the dichroic mirror 41, the fluorescent wheel 50 is arranged between the first reflector 421 and the dichroic mirror 41, and the first reflector 421 is used to receive and reflect the light beam emitted by the fluorescent wheel 50, so that the light beam is transmitted along the first direction; a second reflector 422, which is arranged at intervals in the reflection direction of the first reflector 421, and is used to receive and reflect the light beam emitted by the first reflector 421, so that the light beam is transmitted along the second direction; and A third reflector 423 is disposed at intervals in the reflection direction of the second reflector 422 and is disposed relatively at intervals with the dichroic mirror 41 along the first direction, for receiving and reflecting the light beam emitted by the second reflector 422, so that the light beam is transmitted to the dichroic mirror 41 along the first direction, and is reflected by the dichroic mirror 41 and then transmitted toward the color filter wheel 60.

[0042] Specifically in this embodiment, the first reflector 421 and the dichroic mirror 41 are arranged relatively spaced apart in the second direction, the second reflector 422 and the first reflector 421 are arranged relatively spaced apart in the first direction, and the third reflector 423 and the second reflector 422 are arranged relatively spaced apart in the second direction, and are arranged relatively spaced apart from the dichroic mirror 41 along the first direction. The dichroic mirror 41, the first reflector 421, the second reflector 422 and the third reflector 423 are all arranged at an angle of 45° relative to the light transmission direction. Such an arrangement is conducive to simplifying the optical path design of the light guide component and facilitating the assembly and arrangement of the light guide assembly 40.

[0043] Optionally, in some embodiments, the laser optical system 100 may further include a beam shaping component, which may be used to transmit the light beam and realize the conversion from a circular light spot to a square light spot.

[0044] Furthermore, after the laser beam generated by the light source assembly 10 of the laser optical system 100 is modulated by optical components such as the beam reducing assembly 30, the three-color light emitted by the color filter wheel 60 can be transmitted to the display chip through the light rod. The display chip is used to further modulate the light beam, and the light beam can be further transmitted to the projection lens under the control of the display chip, so that the light beam can be projected outward through the lens assembly 70 to perform image formation and realize the output of the three-color light image. Among them, the display chip can be set as a digital micromirror device but is not limited to it.

[0045] The lens assembly 70 can project the image onto the projection screen with a suitable focal length, thereby realizing the projection display of the image on the projection screen. The specific optical lens composition scheme can be set according to actual needs. This application does not limit the lens type and quantity of the lens assembly 70.

[0046] The present invention further proposes a projector, which includes a lens assembly 70 and a laser optical system 100. The specific structure of the laser optical system 100 refers to the above-mentioned embodiment. Since the projector adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0047] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A laser optical system, characterized in that: The invention comprises a light source assembly, wherein the light source assembly comprises: A light emitting component, the light emitting component comprising at least two lasers; and A light combining component, wherein the light combining component comprises at least one light combining element, wherein the light combining element is arranged on the light emitting path of one of the lasers and is used for reflecting the light beam emitted by one of the lasers so that the light emitting component emits a light beam along a first direction.

2. The laser optical system according to claim 1, characterized in that The light emitting component comprises a first laser and a second laser, the first laser and the second laser are arranged opposite to each other in a second direction perpendicular to the first direction, and the light emitting directions of the first laser and the second laser are arranged opposite to each other; The light combining component includes a first light combining element and a second light combining element, which are arranged side by side between the first laser and the second laser, and are used to respectively receive the light beams emitted by the first laser and the second laser, so that the two light beams are transmitted in parallel along the first direction.

3. The laser optical system according to claim 2, wherein: A first reflecting surface is provided on a side of the first light combining element facing the first laser, and the first reflecting surface extends obliquely toward the first direction in a direction away from the first laser; A second reflecting surface is provided on a side of the second light combining element facing the second laser. The second reflecting surface extends obliquely in a direction away from the second laser toward the first direction.

4. The laser optical system according to claim 3, characterized in that The light source assembly further includes a third laser, which is located between the two lasers and is used for emitting a light beam along the first direction.

5. The laser optical system according to claim 4, characterized in that: The first reflecting surface and the second reflecting surface are symmetrically arranged along the first direction; The third laser and the light combining component are staggered along a third direction, and the third direction is perpendicular to the first direction and the second direction.

6. The laser optical system according to any one of claims 1 to 5, characterized in that: The laser optical system further includes a beam reduction assembly, which extends along the first direction and is located on the light output path of the light source assembly, and is used for reducing the light beam emitted by the light source assembly.

7. The laser optical system according to claim 6, wherein: The laser optical system further comprises: A light guide assembly, the light guide assembly is arranged on the light output path of the beam reducing assembly, and a first light path and a second light path are formed in the light guide assembly; a fluorescent wheel, disposed in the first light path; and The color filter wheel is arranged on the light output path of the light guide assembly and is used for receiving the light beams emitted along the first light path and the second light path.

8. The laser optical system according to claim 7, characterized in that: The light guide assembly comprises: a dichroic mirror, disposed on the light-emitting path of the beam reducing assembly to form a transmitted light beam transmitted along the first light path and a reflected light beam transmitted along the second light path; and A light guiding component is provided in the second light path and is used for guiding the reflected light beam to be transmitted along the second light path toward the color filter wheel.

9. The laser optical system according to claim 8, characterized in that The light guide component comprises: a first reflector, wherein the first reflector is arranged at intervals in the reflection direction of the dichroic mirror, the fluorescent wheel is arranged between the first reflector and the dichroic mirror, and the first reflector is used to receive and reflect the light beam emitted by the fluorescent wheel so that the light beam is transmitted along the first direction; a second reflector, the second reflector being arranged at intervals in the reflection direction of the first reflector and being used to receive and reflect the light beam emitted by the first reflector so that the light beam is transmitted along a second direction perpendicular to the first direction; and A third reflector, wherein the third reflector is spaced apart in the reflecting direction of the second reflector and is spaced apart relative to the dichroic mirror along the first direction, and is used for receiving and reflecting the light beam emitted by the second reflector, so that the light beam is transmitted to the dichroic mirror along the first direction, and is transmitted toward the color filter wheel after being reflected by the dichroic mirror.

10. A projector, characterized in that: Comprising the laser optical system according to any one of claims 1 to 9.

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