Projection system and projection equipment with same

Abstract

The utility model belongs to the technical field of projection, and discloses a projection system, which is characterized in that components in the system are assembled on the same assembly reference surface, so that light paths in the projection system are positioned on the same plane, the system uses few lenses, the size is small, the cost is well reduced, the light path is shortened, and the size of an illumination system is reduced. The utility model also discloses projection equipment with the projection system.

Description

TECHNICAL FIELD

[0001] The utility model belongs to projection technology field, especially relate to a projection system and have its projection equipment. BACKGROUND

[0002] At present, the market household projector adopts LED as light source, and the LED color is rich, the picture uniformity is good, and the speckle is not easy to appear. Limited by the characteristics of LED light source, the LED projection system still has the problems of large volume, many lenses in optical system, and high cost. CONTENT

[0003] In order to solve the above technical problems, the utility model discloses a projection system, uses few lenses, small volume, can reduce cost, shorten light path and reduce the volume of illumination system. The utility model discloses a projection device with the projection system.

[0004] The specific technical scheme of the utility model is as follows:

[0005] A projection system comprises a color light source, a light combining assembly, a relay assembly, a digital micromirror device and a projection lens.

[0006] The color light source is combined by the light combining assembly to form illumination light, and the illumination light is guided to the digital micromirror device by the relay assembly to be modulated into image light emitted from the projection lens.

[0007] The color light source, the light combining assembly, the relay assembly, the digital micromirror device and the projection lens are located on the same assembly reference surface, so that the light path in the projection system is in the same plane.

[0008] In the application, the plurality of color light sources, the light combining assembly, the relay assembly, the digital micromirror device and the projection lens are located on the same assembly reference surface, and the structure makes the light path in the projection system in the same plane, so that the overall structure is more flattened, the height is lower, and the structure is more compact.

[0009] Preferably, a first light combining and converging lens is arranged on the light path of the color light source, and the first light combining and converging lens is a plano-convex lens.

[0010] The first light combining and converging lens can converge light to improve the brightness and uniformity of the light beam, thereby improving the quality of the projection picture.

[0011] Preferably, the light emitting surface of the first light combining and converging lens is a spherical surface.

[0012] The curved surface design of the spherical lens can concentrate light on a point, thereby improving the brightness and focusing degree of light.

[0013] Preferably, the ratio of the center thickness of the light-exiting surface of the first light converging and collecting lens to the radius of curvature is less than 1.5.

[0014] The ratio can ensure the optical performance of the first light converging and collecting lens and make the lens have sufficient mechanical strength to meet the appropriate safety requirements; and compared with thick spherical lens or lenticular lens, the manufacturing cost is lower, which is conducive to reducing the cost.

[0015] Preferably, the light-exiting side of the first light converging and collecting lens is provided with a second light converging and collecting lens, and the light-exiting surface of the second light converging and collecting lens is a double-arc surface of non-central symmetry structure.

[0016] The structure can well reduce the aberration of the periphery of the lens, and at the same time realize the functions of converging and shaping, and without the need of additionally adding light converging and shaping lenses, the cost is reduced, and the number of single-channel lenses can be better reduced.

[0017] Preferably, the relay assembly includes a light homogenizing device, a reflecting lens, a relay lens and a prism arranged on the light converging and collecting light path of the light converging assembly, and the reflecting lens is inclined to the optical axis to turn the light path.

[0018] The angle of the reflecting lens relative to the optical axis is 45°-52°.

[0019] The angle can further reduce the volume and improve the space utilization.

[0020] Preferably, the relay lens is inclined to the optical axis, and the angle of the illuminating light incident on the relay lens is 90°-104°.

[0021] Preferably, the light-incident surface of the relay lens is 91-102° to the plane of the digital micromirror device.

[0022] The light-incident surface of the prism is 91-95° to the plane of the digital micromirror device.

[0023] The angle can further reduce the volume and improve the space utilization.

[0024] Preferably, the excitation light source is further included, the light converging assembly includes a light splitting element, the light emitted by the excitation light source is guided to one color light source by the light splitting element to excite the generation of excitation color light, the excitation color light and the color light emitted by the color light source are emitted to the light splitting element in the same direction, the light splitting element reflects the light emitted by the excitation light source and transmits the excitation color light and the color light emitted by the color light source, or the light splitting element transmits the light emitted by the excitation light source and reflects the excitation color light and the color light emitted by the color light source.

[0025] The light emitted by the excitation light source can improve the brightness, thereby improving the projection effect.

[0026] A projection device, comprising the projection system described above.

[0027] Compared with existing technologies, this invention can effectively reduce the size of the projection system. This invention reduces the number of lenses, effectively reduces costs, and further reduces the size of the projection system while shortening the optical path, resulting in higher space utilization. Attached Figure Description

[0028] Fig. 1 This is one embodiment of the present utility model;

[0029] Fig. 2 This is another embodiment of the present utility model;

[0030] Fig. 3 This is another embodiment of the present invention.

[0031] In the diagram: 1-Digital micromirror device; 2-Projection lens; 3-Green light source; 4-Blue light source; 5-Red light source; 6-First lens; 7-Second lens; 8-Third lens; 9-Fourth lens; 10-Fifth lens; 11-Sixth lens; 12-First beam splitter; 13-Second beam splitter; 14-Shaping lens; 15-Blue excitation light source; 16-Beam homogenizer; 17-Relay lens; 18-Reflecting lens; 19-Seventh lens; 20-Eighth lens; 21-Prism. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to specific embodiments.

[0033] like Figs. 1-3 As shown, a projection system includes a color light source, a light combining component, a relay component, a digital micromirror device 1, and a projection lens 2. Several color light sources are combined by the light combining component to form illumination light, which is then guided by the relay component to the digital micromirror device 1 to be modulated into image light emitted from the projection lens 2. The color light source, light combining component, relay component, digital micromirror device 1, and projection lens 2 are located on the same assembly reference plane so that the light paths in the projection system are in the same plane.

[0034] In some existing technologies, multiple components have at least two assembly reference surfaces, thus occupying a large volume in both the width and height directions of the projection system. This embodiment, based on a flattened structural design, effectively reduces the length in the height direction, thereby achieving a smaller volume. In this embodiment, the color light source includes a green light source 3, a blue light source 4, and a red light source 5. The blue light emitted by the blue light source 4 is parallel to the green light emitted by the green light source 3. The red light source 5 is located to one side of the blue light source 4, and the red light it emits is perpendicular to the blue light.

[0035] In this embodiment, a first beam-combining lens is provided in the output light path of the colored light source, and a second beam-combining lens is provided on the light-emitting side of the first beam-combining lens. Fig. 1 As shown, the first and second beam-combining lenses on the green light source 3 side are designated as lens 6 and lens 7, respectively. Similarly, the first and second beam-combining lenses on the blue light source side are designated as lens 8 and lens 9, respectively, and the first and second beam-combining lenses on the red light source side are designated as lens 10 and lens 11, respectively. Furthermore, the beam-combining assembly in this embodiment includes a first beam splitter 12, a second beam splitter 13, and a shaping lens 14. The first beam splitter 12 transmits red light and reflects blue light, the shaping lens 14 transmits both red and blue light, and the second beam splitter 13 reflects both red and blue light and transmits green light. Therefore, in this embodiment, the red light source 5 emits red light, which is transmitted through the first beam splitter 12 to the shaping lens 14. The blue light source 4 emits blue light, which is reflected by the first beam splitter 12 to the shaping lens 14. The red and blue light converge and are shaped at the shaping lens 14 to form a first combined light. At the same time, the green light emits green light, which is transmitted through the second beam splitter 13 to form illumination light with the first combined light. Thus, the illumination light enters the relay component. In this embodiment, the first combined light receiving lens is a plano-convex lens. The light-emitting surface of the first combined light receiving lens is spherical. The ratio of the lens center thickness to the radius of curvature of the light-emitting surface of the first combined light receiving lens is less than 1.5. That is, the first lens 6, the third lens 8, and the fifth lens 10 are plano-convex lenses with spherical light-emitting surfaces, and the ratio of the lens center thickness to the radius of curvature of the light-emitting surfaces of the first lens 6, the third lens 8, and the fifth lens 10 is less than 1.5. In this embodiment, the light-emitting surface of the second lens 7 is a non-centrosymmetric double-arc surface, which enables the convergence and shaping of green light. It should also be noted that in this embodiment, the first beam splitter 12 and the second beam splitter 13 are parallel.

[0036] like Fig. 2As shown, in some other embodiments, an excitation light source is also included. The light combining component includes a beam splitter. The light emitted by the excitation light source is guided by the beam splitter to one of the color light sources to generate an excitation color light. The excitation color light and the color light emitted by the color light source are emitted in the same direction to the beam splitter. The beam splitter reflects the light emitted by the excitation light source and transmits the excitation color light and the color light emitted by the color light source, or the beam splitter transmits the light emitted by the excitation light source and reflects the excitation color light and the color light emitted by the color light source. The beam splitter is a second beam splitter 13. Specifically, in this embodiment, a blue light excitation light source is also included. The blue light excitation light source is located on one side of the green light source 3 and opposite the red light source 5. The light emitted by the blue excitation light source 15 is perpendicular to the green light. Therefore, the light emitted by the blue excitation light source 15 is reflected by the second beam splitter 13 to the green light source 3, thereby exciting the green light source 3 to emit new green light, thus significantly improving the brightness. It is known that the first beam-combining and beam-collecting lens and the second beam-combining and beam-collecting lens arranged in the output light path of the blue excitation light source 15 are the seventh lens 19 and the eighth lens 20. Thus, the light emitted by the blue excitation light source 15 is collected by the seventh lens and the eighth lens 20, reflected and guided by the second beam splitter 13 to the green light source 3 to emit new green light. After being collected by the first lens 6, it is collected and shaped by the second lens 7, and finally transmitted through the second beam splitter 13 to form illumination light with the first beam-combining lens.

[0037] In this embodiment, the relay component includes a light-diffusing device 16, a reflective mirror 18, a relay mirror 17, and a prism 21 disposed on the light-exiting path of the light-combining component. The reflective mirror 18 is tilted to the optical axis to deflect the light path. In this embodiment, the prism 21 is a total internal reflection prism. The focused and shaped illumination light is focused by the light-diffusing device 16 and reflected by the reflective mirror 18 to be incident on the relay mirror 17. After being focused by the relay illumination mirror, the illumination light enters the prism 21, undergoes total internal reflection, and reaches the digital micromirror device 1. Further, in this embodiment, the tilt angle of the reflective mirror 18 is 45° to 52°, and the reflective mirror 18 achieves light path deflection, effectively reducing the overall volume of the projection system. The light-incident surface of the relay mirror 17 is at 102° to the plane of the digital micromirror device 1; the light-incident surface of the prism 21 is at 94° to the plane of the digital micromirror device 1. In this embodiment, the light-uniforming device 16 is a compound eye lens. In other embodiments, it can also be a light bar, light cone, etc. Since this embodiment uses a reflecting lens 18 to deflect light, and only one relay lens 17 is used between the reflecting lens 18 and the prism 21, the combination of the reflecting lens 18 and the relay lens 17 replaces the two eccentric lenses commonly used in the prior art. The structure is simple and compact, and while ensuring the uniformity of the lighting system, it can reduce costs, shorten the optical path, and reduce the size of the lighting system.

[0038] Specifically, under current drive, the digital micromirror device 1 deflects. When the deflection angle is 17°, the incident angle of light on the surface of the digital micromirror device 1 is 34±0.5°. In this embodiment, the tilt angle of the reflecting mirror 18 is set to 51°. Of course, it can also be 45°, 46°, 47°, 48°, 49°, 50°, or 52°, and can be adjusted accordingly based on the actual structure and requirements. Thus, when the tilt angle of the reflecting mirror 18 is set to 51°, the angle incident on the relay mirror 17 is 102°. In practice, the incident angle can also be 90°, 91°...101°, 103°, 104°; the state of the light-incident surface of the relay lens 17 and the light-incident surface of the prism 21 is limited by the tilt angle of the reflecting lens 18 and the incident angle of the light on the surface of the digital micromirror device 1. The light-incident surface of the relay lens is at an angle of 91° to 102° with the plane of the digital micromirror device 1, specifically 91°, 92°, 93°...101°, 102°, thus forming image light. The light-incident surface of the prism is at an angle of 91° to 95° with the plane of the digital micromirror device. Then, under the drive of the current, the digital micromirror device 1 deflects again by an angle of 17°. The image light enters the prism 21, is transmitted, and enters the projection lens 2, thereby allowing the projection lens 2 to project the image. In this embodiment, the plane of the digital micromirror device 1 is perpendicular to the optical axis of the projection lens 2.

[0039] Based on this, it can be understood that in this embodiment, the prism 21 reflects the illumination light and transmits the image light. Therefore, in some other embodiments, projection can also be achieved by transmitting the illumination light and reflecting the image light through the prism 21.

[0040] Therefore, in this embodiment, the green light source 3, the blue light source 4, the red light source 5, and the first beam-combining lens and the second beam-combining lens that cooperate with the corresponding light sources are located on the same assembly reference plane. In addition, the first beam splitter 12, the shaping lens 14, the second beam splitter 13, the light-diffusing device 16, the reflecting lens 18, the relay lens 17, the prism 21, the digital micromirror device 1, and the projection lens 2 are also located on the same assembly reference plane. The two assembly reference planes mentioned above are the same plane. Therefore, the projection system disclosed in this utility model has the advantages of a flat system structure and small size. The longest channel of the entire optical path is the channel of the red light, which is U-shaped. After the illumination light is formed, it is connected by compound eye lenses, which have a high degree of folding, making the projection system structure more compact.

[0041] In this embodiment, the blue and red light rays are converged by the first beam splitter 12 to form a first combined beam, which is then shaped by the shaping lens 14. In this embodiment, since the light-emitting surface of the second beam-combining lens is a non-centrosymmetric double-arc surface, meaning that if the second beam-combining lens is driven to rotate, the light-gathering position before and after rotation is different, the second beam-combining lens, in addition to achieving beam gathering, also has a shaping function. Therefore, in other embodiments, such as...Fig. 3 As shown, the same structure can be used for the fourth lens 9 and the sixth lens 11. In this case, the shaping lens 14 between the first beam splitter 12 and the second beam splitter 13 can be reduced, thereby further reducing the number of lenses in the system.

[0042] Based on this embodiment, a projection device is also disclosed, which has the above-described projection system, and thus the projection device has the above-described technical effects.

[0043] The above are merely preferred embodiments of this utility model. It should be noted that the above preferred embodiments should not be considered as limitations on this utility model, and the scope of protection of this utility model should be determined by the scope defined in the claims. For those skilled in the art, several improvements and modifications can be made without departing from the spirit and scope of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model.

Claims

1. A projection system, characterized in that, This includes color light sources, light combining components, relay components, digital micromirror devices, and projection lenses; Several colored light sources are combined into illumination light by a light combining component, and the illumination light is guided to a digital micromirror device by a relay component to be modulated into image light emitted from a projection lens; The color light source, light combining component, relay component, digital micromirror device and projection lens are located on the same assembly reference plane so that the light path in the projection system is in the same plane.

2. The projection system as described in claim 1, characterized in that, The light path of the colored light source is provided with a first light-combining and beam-collecting lens, which is a plano-convex lens.

3. A projection system as described in claim 2, characterized in that, The light-emitting surface of the first beam-combining lens is spherical.

4. A projection system as described in claim 2, characterized in that, The ratio of the thickness at the center of the light-emitting surface of the first beam-combining lens to its radius of curvature is less than 1.

5.

5. A projection system as described in claim 2, characterized in that, A second beam-combining lens is provided on the light-emitting side of the first beam-combining lens, and the light-emitting surface of the second beam-combining lens is a double-arc surface with a non-centrally symmetrical structure.

6. A projection system as described in claim 1, characterized in that, The relay component includes a light homogenizing device, a reflective lens, a relay lens, and a prism arranged on the light output path of the light combining component. The reflective lens is tilted to the optical axis to deflect the light path. The tilt angle of the reflective lens relative to the optical axis is 45° to 52°.

7. A projection system as described in claim 6, characterized in that, The relay lens is tilted to the optical axis, and the angle at which the illumination light is incident on the relay lens is 90° to 104°.

8. A projection system as described in claim 7, characterized in that, The light-incident surface of the relay lens is at an angle of 91 to 102° to the plane of the digital micromirror device; The light-incident surface of the prism is at an angle of 91 to 95° to the plane of the digital micromirror device.

9. A projection system as described in claim 1, characterized in that, It also includes an excitation light source. The light combining component includes a beam splitting element. The light emitted by the excitation light source is guided by the beam splitting element to one of the color light sources to generate an excitation color light. The excitation color light and the color light emitted by the color light source are emitted in the same direction to the beam splitting element. The beam splitting element reflects the light emitted by the excitation light source and transmits the excitation color light and the color light emitted by the color light source, or the beam splitting element transmits the light emitted by the excitation light source and reflects the excitation color light and the color light emitted by the color light source.

10. A projection device, characterized in that, Including the projection system as described in any one of claims 1 to 9.

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