CN117492192A - Projection lens - Google Patents
Projection lens Download PDFInfo
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- CN117492192A CN117492192A CN202311647601.7A CN202311647601A CN117492192A CN 117492192 A CN117492192 A CN 117492192A CN 202311647601 A CN202311647601 A CN 202311647601A CN 117492192 A CN117492192 A CN 117492192A
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- 238000003384 imaging method Methods 0.000 claims abstract description 25
- 238000012800 visualization Methods 0.000 claims 2
- 230000000694 effects Effects 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 9
- 230000004075 alteration Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 239000000463 material Substances 0.000 description 1
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- 238000005457 optimization Methods 0.000 description 1
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- 238000002310 reflectometry Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/28—Reflectors in projection beam
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Abstract
The invention provides a projection lens. The projection lens includes: the image source assembly at least comprises a display chip; the refraction lens group is positioned on the light emitting side of the imaging chip; the reflecting mirror group at least comprises a reflecting bowl lens, the reflecting bowl lens is positioned at the light emitting side of the refracting mirror group, and the reflecting bowl lens is used for reflecting the light rays emitted by the refracting mirror group; the split screen lens group comprises at least one reflecting surface, a part of light rays reflected by the reflecting bowl lens form a first projection image along a first direction, and the other part of light rays reflected by the reflecting bowl lens form a second projection image along a second direction; the first direction and the second direction are arranged at an angle. The invention solves the problem that the split-screen display and the high imaging quality of the projection lens in the prior art are difficult to be simultaneously considered.
Description
Technical Field
The invention relates to the technical field of optical projection equipment, in particular to a projection lens.
Background
With the development progress of optical projection technology, projectors are increasingly and widely used in various fields, the application scene diversification requirements of users on the projectors are continuously enhanced, the forms of the projectors are continuously innovated, and the projectors are developed to various crossing fields. Therefore, for wider and deeper application of the projector, development technicians are also prompted to break through innovations continuously, and a projection lens capable of being realized more complex, more powerful and more functions is provided on the premise of conforming to the physical principle. At present, the projection on the market usually takes a remote controller as a medium to realize interaction between a user and a projector and further realize the function of controlling the projector, but more time is needed to move the cursor of the remote controller in the processes of inputting passwords, selecting contents and the like, so that the remote controller is very inconvenient to use. If the projector is provided with a screen with interaction function, such as a projection lens capable of realizing split-screen display, the user experience is greatly improved, and more interesting playing methods can be brought to the user outside the function of the remote controller.
The existing projection lens adopts the addition of lens elements, so that imaging light rays are projected in different directions after being reflected in the lens for multiple times, and two projection pictures are realized at different positions; and the lens element changes the light propagation direction without aberration correction, resulting in low imaging quality.
That is, the projection lens in the prior art has a problem that it is difficult to simultaneously achieve split-screen display and high imaging quality.
Disclosure of Invention
The invention mainly aims to provide a projection lens, which solves the problem that the split-screen display and the high imaging quality of the projection lens in the prior art are difficult to be simultaneously considered.
In order to achieve the above object, the present invention provides a projection lens comprising: the image source assembly at least comprises a display chip; the refraction lens group is positioned on the light emitting side of the imaging chip; the reflecting mirror group at least comprises a reflecting bowl lens, the reflecting bowl lens is positioned at the light emitting side of the refracting mirror group, and the reflecting bowl lens is used for reflecting the light rays emitted by the refracting mirror group; the split screen lens group comprises at least one reflecting surface, a part of light rays reflected by the reflecting bowl lens form a first projection image along a first direction, and the other part of light rays reflected by the reflecting bowl lens form a second projection image along a second direction; the first direction and the second direction are arranged at an angle.
Further, from the image source side to the amplifying side of the projection lens, the combined focal length of the refraction lens group and the reflecting mirror group is a negative value; and/or the refractive lens group and the reflecting mirror group form an ultra-short focal structure, and the maximum field angle of the ultra-short focal structure is more than or equal to 140 degrees and less than or equal to 160 degrees.
Further, the reflectance of the reflecting surface is 80% or more.
Further, the split-screen lens group comprises a first reflecting surface and a second reflecting surface, the second reflecting surface is located at one side, far away from the reflecting bowl lens, of the first reflecting surface, the first reflecting surface is located in the first direction, an angle is formed between the first reflecting surface and the second reflecting surface, and the second reflecting surface is used for reflecting light rays of the first reflecting surface so as to form a second projection image.
Further, an included angle between the first reflecting surface and the second reflecting surface is greater than or equal to 30 degrees and less than or equal to 90 degrees.
Further, an included angle between the first reflecting surface and the reflecting bowl lens is more than or equal to-30 degrees and less than or equal to 45 degrees.
Further, the split-screen mirror group comprises a first split-screen mirror and a second split-screen mirror, wherein the first split-screen mirror is provided with a first reflecting surface, and the second split-screen mirror is provided with a second reflecting surface.
Further, the split screen lens group comprises a prism, the prism is provided with a first reflecting surface, a second reflecting surface and a transmitting surface which are sequentially connected, and two adjacent surfaces in the first reflecting surface, the second reflecting surface and the transmitting surface are arranged at an angle.
Further, the reflecting bowl lens is provided with a reflecting curved surface, the reflecting curved surface is a concave surface, and the reflecting curved surface is used for diverging light rays.
Further, the reflector group further comprises a reflector, the reflector is located between the refraction mirror group and the reflection bowl lens, and the reflector is used for reflecting light rays of the refraction mirror group to the reflection bowl lens.
Further, the refractive lens group comprises at least three lenses, a diaphragm and a driving motor, wherein the at least three lenses comprise a first lens, a second lens and a third lens, and the first lens to the third lens are sequentially arranged along the direction far away from the imaging chip; the driving motor is in driving connection with the diaphragm so that the aperture of the diaphragm can be adjusted; and/or the image source component further comprises an equivalent prism and a galvanometer which are sequentially arranged on the light emitting side of the imaging chip.
Further, the light reflected by the reflecting bowl lens forms a projection image, the projection image is divided into a first area and a second area along the longitudinal direction, the reflecting surface covers one area of the first area and the second area, so that the reflecting surface reflects the light of the area and forms a second projection image along the second direction, and the light which is not covered by the reflecting surface and forms the other area of the first area and the second area forms a first projection image along the first direction; or the projection image is divided into a first area and a second area along the transverse direction, and the reflecting surface covers one area of the first area and the second area, so that the reflecting surface reflects light rays of the area and forms a second projection image along the second direction, and the light rays which are not covered by the reflecting surface and form the other area of the first area and the second area form the first projection image along the first direction.
Further, the display content of the first projection image and the display content of the second projection image are the same or different.
By applying the technical scheme of the invention, the projection lens comprises an image source component, a refraction lens group, a reflecting mirror group and a split screen lens group, wherein the image source component at least comprises a display chip; the image source assembly at least comprises a display chip; the refraction mirror group is positioned on the light-emitting side of the imaging chip; the reflecting mirror group at least comprises a reflecting bowl lens, the reflecting bowl lens is positioned at the light emitting side of the refracting mirror group, and the reflecting bowl lens is used for reflecting the light rays emitted by the refracting mirror group; the split screen lens group comprises at least one reflecting surface; a part of the light rays reflected by the reflecting bowl lens form a first projection image along a first direction, and the other part of the light rays are reflected by at least one reflecting surface to form a second projection image along a second direction; the first direction and the second direction are arranged at an angle.
The refraction mirror group can amplify, optimize and transmit the image light of the imaging chip to the mirror group department, and the mirror group can further realize that the aberration of light is corrected, through setting up the reflection bowl lens for the reflection bowl lens can further diverge the light, spreads out the light of different visual fields, realizes projection display, can make the light even can guarantee that the aberration is less under the circumstances of big visual angle. The first projection image is formed along the first direction by one part of the light rays reflected by the reflecting bowl lens, the second projection image is formed along the second direction by the reflection of at least one reflecting surface by the other part of the light rays reflected by the reflecting bowl lens, the first direction and the second direction are arranged at an angle, and the reflecting surface of the split screen lens group is utilized to deflect the other part of the light rays reflected by the reflecting bowl lens, so that the second projection image is formed along the second direction by the part of the light rays, the first projection image and the second projection image are respectively positioned in two different directions by the part of the light rays which are not reflected by the reflecting surface, and the imaging positions of the first projection image and the second projection image are two different positions.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
fig. 1 shows a schematic optical path diagram of a projection lens according to a first embodiment of the present invention;
FIG. 2 shows an image effect diagram of the projection lens of FIG. 1;
fig. 3 shows a division effect diagram of a projection image of a projection lens according to a first embodiment of the present invention;
fig. 4 is a schematic view of an optical path of a projection lens according to a second embodiment of the present invention;
fig. 5 shows a division effect diagram of a projection image of a projection lens according to a third embodiment of the present invention.
Wherein the above figures include the following reference numerals:
10. a developing chip; 20. an equivalent prism; 30. vibrating mirror; 40. refractive lens group; 51. a reflecting mirror; 52. a reflective bowl lens; 61. a first split-screen mirror; 62. a second split screen mirror; 63. a prism; 64. a first reflecting surface; 65. a second reflecting surface; 66. a transmissive surface; 71. a first projection image; 72. a second projection image; 73. a first region; 74. a second region.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.
In the present invention, unless otherwise indicated, terms of orientation such as "upper, lower, top, bottom" are used generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, upright or gravitational direction; also, for ease of understanding and description, "inner and outer" refers to inner and outer relative to the profile of each component itself, but the above-mentioned orientation terms are not intended to limit the present invention.
In order to solve the problem that split-screen display and high imaging quality are difficult to be simultaneously considered in the projection lens in the prior art, the invention provides the projection lens.
As shown in fig. 1 to 5, the projection lens includes an image source assembly, a refractive lens assembly 40, a reflective lens assembly, and a split-screen lens assembly, wherein the image source assembly at least includes a display chip 10; the image source assembly at least comprises a developing chip 10; the refractive lens group 40 is positioned on the light-emitting side of the imaging chip 10; the reflecting mirror group at least comprises a reflecting bowl lens 52, the reflecting bowl lens 52 is positioned on the light emergent side of the refracting mirror group 40, and the reflecting bowl lens 52 is used for reflecting the light rays emergent from the refracting mirror group 40; the split screen lens group comprises at least one reflecting surface; a part of the light reflected by the reflecting bowl lens 52 forms a first projection image 71 along a first direction, and the other part forms a second projection image 72 along a second direction by reflection of at least one reflecting surface; the first direction and the second direction are arranged at an angle.
The refraction mirror group 40 can amplify, optimize and transmit the image light of the imaging chip 10 to the mirror group, the mirror group can further realize that the aberration of the light is corrected, and by arranging the reflection bowl lens 52, the reflection bowl lens 52 can further disperse the light, disperse the light with different fields of view, realize projection display, form projection images, and can ensure that the aberration of the light is smaller even under the condition of a large viewing angle. The first projection image 71 is formed by a part of the light rays reflected by the reflecting bowl lens 52 along the first direction, the second projection image 72 is formed by the other part of the light rays reflected by the at least one reflecting surface along the second direction, the first direction and the second direction are arranged at an angle, and the other part of the light rays reflected by the reflecting bowl lens 52 are deflected by the at least one reflecting surface of the split-screen lens group, so that the second projection image 72 is formed by the part of the light rays along the second direction, the first projection image 71 is formed by a part of the light rays which are not reflected by the reflecting surface along the first direction, the first projection image 71 and the second projection image 72 are respectively positioned in two different directions, and the imaging positions of the first projection image 71 and the second projection image 72 are two different positions.
The display chip 10 is a DMD chip. And the DMD chip is only one, so that the projection lens of the application can realize the function of displaying high-imaging quality images at different positions under the condition of only one imaging chip 10, the first projection image 71 and the second projection image 72 form a complete projection image of the imaging chip 10, in the alternative embodiment of the application, the display contents of the first projection image 71 and the second projection image 72 can be the same or different, and the actual display images can be controlled by software according to specific requirements so as to meet diversified requirements.
It should be noted that, the projection lens further includes a first screen and a second screen, the first screen is used for receiving the first projection image 71, and the size of the first screen is matched with the first projection image 71; the second screen is for receiving the second projected image 72, and the size of the second screen matches the size of the second projected image 72. Specifically, the reflectivity of the reflecting surface of the split-screen lens group is more than or equal to 80%. This arrangement is advantageous in ensuring the brightness of the second projection image 72 and ensuring the display effect.
Specifically, the split-screen lens group includes a first reflecting surface 64 and a second reflecting surface 65, the second reflecting surface 65 is located at a side of the first reflecting surface 64 away from the reflecting bowl lens 52, the first reflecting surface 64 is located in a first direction, an angle is formed between the first reflecting surface 64 and the second reflecting surface 65, specifically, an included angle between the first reflecting surface 64 and the second reflecting surface 65 is greater than or equal to 30 ° and less than or equal to 90 °, and the second reflecting surface 65 is used for reflecting light rays of the first reflecting surface 64 to form a second projection image 72. Since the light emitted from the reflecting bowl lens 52 is gradually enlarged and can finally form a rectangular projection image, the first reflecting surface 64 can receive a small portion of the light emitted from the reflecting bowl lens 52 and reflect the small portion of the light to the second reflecting surface 65, and the second projection image 72 is formed by the reflection of the second reflecting surface 65. Most of the light rays emitted from the reflecting bowl lens 52 form a first projection image 71, the first projection image 71 and a second projection image 72 are respectively located at two different positions, and the projection direction forming the first projection image 71 is different from the projection direction forming the second projection image 72.
In the specific embodiment of the present application, the angle between the first reflecting surface 64 and the reflecting bowl lens 52 is in the range of-30 ° or more and 45 ° or less. By reasonably restricting the angle between the first reflecting surface 64 and the reflecting bowl lens 52, it is beneficial to ensure that the first reflecting surface 64 can stably receive at least part of the light reflected by the reflecting bowl lens 52, thereby ensuring that the first reflecting surface 64 covers the stability of part of the light of the projected image, and further ensuring that the second projected image 72 can stably image in different directions. The calibration mode of the positive and negative direction angles is as follows: the human eye is based on the first projection image 71, and the upper side near the first projection image 71 is above the first reflection surface 64, and the lower side near the first projection image 71 is below the first reflection surface 64. Then, the upper direction of the first reflecting surface 64 is inclined at a negative angle to the human eye direction, and the lower direction of the first reflecting surface 64 is inclined at a positive angle to the human eye direction.
In addition, the distance between the first reflecting surface 64 of the split-screen lens group and the reflecting bowl lens 52 is smaller than or equal to the vertical distance between the lower side edge of the first screen and the projector.
Referring to fig. 1, the reflective bowl lens 52 has a reflective curved surface, which is a concave surface. Through reasonable optimization concave surface for this reflecting curved surface can diverge the light, can optimize aberration simultaneously, adjustment distortion, adjustment magnifying power simultaneously, and then obtains the imaging effect of required wide-angle, high image quality. Preferably, the radius of curvature of the reflecting curved surface is equal to or greater than-200 mm and equal to or less than 200mm.
Specifically, the mirror assembly further includes a mirror 51, the mirror 51 is located between the refractive mirror assembly 40 and the reflective bowl lens 52, and the mirror 51 is configured to reflect the light of the refractive mirror assembly 40 to the reflective bowl lens 52.
Specifically, an ultra-short focal structure is formed by the image source side to the amplifying side of the projection lens, namely the image source component to the amplifying side, the refraction mirror group and the reflecting mirror group, and the maximum field angle of the ultra-short focal structure is more than or equal to 140 degrees and less than or equal to 160 degrees; and the combined focal length of the refraction lens group and the reflecting lens group is a negative value. In the specific embodiment of the application, the combined focal length of the refraction lens group 40 and the reflecting mirror group is greater than or equal to-1.30 mm and less than or equal to-1.20 mm, and the combined focal length range of the refraction lens group 40 and the reflecting mirror group is reasonably restrained, so that the refraction lens group 40 and the reflecting mirror group are beneficial to ensuring that the refraction lens group 40 and the reflecting mirror group form an ultra-short focal system, and therefore, the projection lens of the application realizes a split-screen projection function while meeting the short focal attribute of the ultra-short focal lens, and ensures the structural compactness of the whole projection lens.
Specifically, the refractive lens group 40 includes at least three lenses, including a first lens, a second lens and a third lens, and the first lens to the third lens are sequentially disposed along a direction away from the imaging chip 10. The refractive lens group 40 is used for amplifying, correcting chromatic aberration, correcting distortion, and the like. The projection lens with large caliber, high performance, low distortion and ultra-short focal length can be obtained by reasonably optimizing the matching among focal lengths, surface shapes, curvatures, material properties, intervals and aspheric coefficients of the first lens, the second lens and the third lens.
In an alternative embodiment of the present application, the refractive lens group 40 is composed of three lenses of the first lens, the second lens and the third lens. The object side surface of the first lens is a concave surface, and the image side surface is a concave surface; the object side surface of the second lens is a convex surface, and the image side surface is a convex surface; the third lens element has a convex object-side surface and a convex image-side surface. The first lens to the third lens are all aspheric lenses, and the surface shape of each aspheric lens can be defined by, but not limited to, the following aspheric formula:
wherein z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction; c is the paraxial curvature of the aspheric surface; k is the conic coefficient.
Table 1 below shows the radii of curvature r of the object-side surface S1 and the image-side surface S2, as well as the respective surface conic coefficients k, the respective higher order coefficients α, of a first lens that can be used in this alternative embodiment 4 、α 6 、α 8 、α 10 、α 12 、α 14 、α 16 。
TABLE 1
| S1 | S2 | |
| r | -149.93 | 11.69 |
| k | 7.19 | -1.92 |
| α 4 | 1.31E-04 | 3.66E-05 |
| α 6 | -5.67E-07 | -1.16E-07 |
| α 8 | 3.35E-09 | 3.19E-09 |
| α 10 | -1.68E-11 | -6.48E-11 |
| α 12 | 5.42E-14 | 4.65E-13 |
| α 14 | -7.30E-17 | -1.11E-15 |
| α 16 | 0 | 0 |
Table 2 below shows the radii of curvature r of the object-side surface S3 and the image-side surface S4, as well as the respective surface conic coefficients k, the respective higher order coefficients α, of a second lens that may be used in this alternative embodiment 4 、α 6 、α 8 、α 10 、α 12 、α 14 、α 16 。
TABLE 2
| S3 | S4 | |
| r | 48.16 | -19.13 |
| k | -14.98 | -2.72 |
| α 4 | -8.84E-05 | -3.25E-05 |
| α 6 | -8.83E-07 | -6.77E-07 |
| α 8 | 1.98E-08 | 1.41E-08 |
| α 10 | -3.59E-10 | -2.49E-10 |
| α 12 | 1.94E-12 | 1.27E-12 |
| α 14 | 0 | 0 |
| α 16 | 0 | 0 |
Table 3 below shows the radii of curvature r of the object-side surface S5 and the image-side surface S6, as well as the respective surface conic coefficients k, the respective higher order coefficients α, for the third lens of the present alternative embodiment 4 、α 6 、α 8 、α 10 、α 12 、α 14 、α 16 。
TABLE 3 Table 3
| S5 | S6 | |
| r | 32.18 | -35.53 |
| k | -6.76 | -1.92 |
| α 4 | -5.08E-05 | 8.88E-06 |
| α 6 | 6.89E-07 | 6.40E-07 |
| α 8 | 3.80E-09 | 1.47E-08 |
| α 10 | 1.86E-10 | -1.23E-10 |
| α 12 | 3.88E-13 | 4.19E-12 |
| α 14 | 0 | 0 |
| α 16 | 0 | 0 |
Of course, the refractive lens group 40 of the present application is not limited to the above-described three-piece lens, and a five-piece lens structure or a more-piece lens structure may be provided as required.
In an alternative embodiment of the present application, the refractive lens group 40 further includes a diaphragm and a driving motor, where the diaphragm is disposed between the second lens and the third lens, and the driving motor is in driving connection with the diaphragm, so that the aperture of the diaphragm is adjustable, thereby implementing an aperture-size-variable diaphragm, so as to adapt to work under different scenes.
Referring to fig. 1, the image source assembly further includes an equivalent prism 20 and a galvanometer 30 sequentially disposed on the light emitting side of the display chip 10. The light emitted from the imaging chip 10 sequentially passes through the equivalent prism 20 and the galvanometer 30 and then enters the refraction mirror group 40. The galvanometer 30 may be a dither galvanometer 30 so that the resolution inherent to the size of the DMD chip itself when the galvanometer 30 is stationary and the 4K high resolution when the galvanometer 30 is operating dithered can be obtained simultaneously. The DMD chip is not coincident with the optical axis of the projection lens, thereby realizing offset. DMD chip.
Of course, the projection lens of the present application further includes a control system, where the control system is configured to regulate the specific content of the first projection image 71 and the second projection image 72, so as to ensure that the first projection image 71 and the second projection image 72 display the same or different images. In an alternative embodiment of the present application, the reflective surface blocks 20% of the area on the lower side of the projection image, and 80% of the upper side of the projection image is the first projection image 71, so that 80% of the upper side of the corresponding DMD chip is controlled to be the main display screen by the screen allocation logic of the software and the hardware, and some video pictures are displayed; the lower 20% of the projected image is the second projected image 72, and the second projected image 72 is controlled to display a remote controller interface or other user demand interfaces, at this time, the size of the second projected image 72 is smaller than that of the first projected image 71, and of course, the specific position of the reflecting surface for shielding the projected image and the size of the reflecting surface can be adjusted according to actual demands, so as to obtain different split-screen effects.
The projection lens of the present application will be described below with reference to specific embodiments and drawings.
Example 1
As shown in fig. 1 to 3, an optical path diagram of a projection lens of the first embodiment is described.
In the first embodiment, the split-screen mirror group includes a first split-screen mirror 61 and a second split-screen mirror 62, the first split-screen mirror 61 has a first reflecting surface 64, and the second split-screen mirror 62 has a second reflecting surface 65. Metal films may be plated on both the first split-screen mirror 61 and the second split-screen mirror 62 to achieve a reflection effect of 80% or more of the first split-screen mirror 61 and the second split-screen mirror 62. The included angle between the first split screen mirror 61 and the second split screen mirror 62 is 30 ° or more and 90 ° or less.
As shown in fig. 2, the angle between the first projection image 71 and the second projection image 72 is 90 °. The second projection image 72 is in front of the first projection image 71, which ensures that the user can see the second projection image 72 at a low head near distance when facing the first projection image 71. The angle between the first projection image 71 and the second projection image 72 may be achieved by adjusting the angle between the first split-screen mirror 61 and the second split-screen mirror 62.
Alternatively, the light reflected by the reflecting bowl lens 52 forms a projected image, which is divided into a first region 73 and a second region 74 disposed vertically, and the first reflecting surface 64 covers one of the first region 73 and the second region 74 such that the first reflecting surface 64 reflects the light of the region and forms a second projected image 72 in the second direction, and the light of the other of the first region 73 and the second region 74, which is not covered by the reflecting surface, forms a first projected image 71 in the first direction. In this embodiment, as shown in fig. 3, the projection image is divided into a first area 73 and a second area 74 arranged up and down by the first split-screen mirror 61, the first split-screen mirror 61 receives 20% of the light of the first area 73 on the upper side of the projection image, and deflects to form a second projection image 72, and 80% of the light of the second area 74 on the lower side of the projection image is normally emitted to form a first projection image 71.
Example two
As shown in fig. 4, an optical path diagram of the projection lens of the second embodiment is described.
In the second embodiment, the split-screen lens group includes a prism 63, where the prism 63 has a first reflecting surface 64, a second reflecting surface 65, and a transmitting surface 66 that are sequentially connected, and two adjacent surfaces of the first reflecting surface 64, the second reflecting surface 65, and the transmitting surface 66 are disposed at an angle therebetween. A part of the light rays emitted from the reflective bowl lens 52 enter the prism 63 through the transmission surface 66 and are incident on the first reflection surface 64, and then are reflected by the first reflection surface 64 and the second reflection surface 65 in sequence, and are emitted from the transmission surface 66 to form a second projection image 72 along the second direction, and the light rays which are not blocked by the first reflection surface 64 form a first projection image 71 along the first direction. The split screen display effect can be achieved by adopting only one structure, and compared with the first embodiment, the split screen display device is simpler in structure and more convenient to assemble.
Example III
As shown in fig. 5, the present embodiment differs from the first embodiment in that the position where the first reflecting surface 64 blocks the projection image is different.
Alternatively, the light reflected by the reflective bowl lens 52 forms a projected image, the projected image is divided into a first region 73 and a second region 74 in the lateral direction, and the first reflective surface 64 covers one of the first region 73 and the second region 74, so that the first reflective surface 64 reflects the light of the region and forms a second projected image 72 in the second direction, and the light of the other of the first region 73 and the second region 74, which is not covered by the first reflective surface, forms a first projected image 71 in the first direction.
In this embodiment, as shown in fig. 5, the projection image is divided into a first area 73 and a second area 74 arranged left and right by the first split-screen mirror 61, and the first split-screen mirror 61 receives 20% of the light of the first area 73 on the left side of the projection image, and deflects to form a second projection image 72, and 80% of the light of the second area 74 on the right side of the projection image is normally emitted to form a first projection image 71.
Of course, in other alternative embodiments, the size and placement of the first split-screen mirror 61 may be adjusted to achieve different splitting of the projected image. In practical applications, the sizes of the first projection image 71 and the second projection image 72 and the division situation of the projection images can be flexibly adjusted by adjusting the size of the first split-screen mirror 61 and the specific position of the shielding projection image. By designing the shape and size of the first split-screen mirror 61 and the second split-screen mirror 62, different split-screen effects can be obtained. Meanwhile, the software control is matched, so that more flexible and multiple functions can be realized. In addition, if at least one lens with curvature is added into the split-screen lens group, the imaging quality of the second projection image 72 can be improved, and simultaneously, high-quality and low-distortion pictures of the first projection image 71 and the second projection image 72 can be realized.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
1. the projection lens disclosed by the invention utilizes the short-focus attribute of the ultra-short-focus lens, and ensures the structural compactness of the whole lens while realizing a split-screen projection function;
2. according to the invention, the angles of the lenses of the split-screen lens group and the distance between the lenses and the reflecting mirror group are optimally adjusted, so that the volume of the projection lens is ensured to be smaller, and the projection lens is ensured not to shade a projection picture;
3. according to the invention, the DMD chip is arranged in an offset manner, namely the optical axes of the DMD chip and the projection lens are not coincident, so that the emergent image is ensured to be offset upwards during projection work, the emergent light beam is higher than the position of the projection lens, and the projection image is not blocked by the projection lens.
It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A projection lens, comprising:
an image source assembly comprising at least a visualization chip (10);
a refractive lens group (40), wherein the refractive lens group (40) is positioned on the light-emitting side of the imaging chip (10);
the reflecting mirror group at least comprises a reflecting bowl lens (52), the reflecting bowl lens (52) is positioned on the light emergent side of the refracting mirror group (40), and the reflecting bowl lens (52) is used for reflecting light rays emergent from the refracting mirror group (40);
the split screen lens group comprises at least one reflecting surface;
a part of the light rays reflected by the reflecting bowl lens (52) form a first projection image (71) along a first direction, and the other part of the light rays reflected by the at least one reflecting surface form a second projection image (72) along a second direction; the first direction and the second direction are arranged at an angle.
2. The projection lens of claim 1, wherein, from the image source side to the magnification side of the projection lens,
the combined focal length of the refraction mirror group (40) and the reflecting mirror group is a negative value; and/or
The refraction mirror group (40) and the reflecting mirror group form an ultra-short focal structure, and the maximum field angle of the ultra-short focal structure is more than or equal to 140 degrees and less than or equal to 160 degrees.
3. The projection lens of claim 1 wherein the reflectance of the reflective surface is 80% or more.
4. The projection lens according to claim 1, wherein the split-screen lens group comprises a first reflecting surface (64) and a second reflecting surface (65), the second reflecting surface (65) is located at a side of the first reflecting surface (64) away from the reflecting bowl lens (52) and the first reflecting surface (64) is located in the first direction, the first reflecting surface (64) and the second reflecting surface (65) are disposed at an angle, and the second reflecting surface (65) is configured to reflect light rays of the first reflecting surface (64) to form the second projection image (72).
5. The projection lens according to claim 4, characterized in that an angle between the first reflecting surface (64) and the second reflecting surface (65) is 30 ° or more and 90 ° or less.
6. Projection lens according to claim 1, characterized in that the angle between the reflecting surface and the reflecting bowl lens (52) is greater than or equal to-30 ° and less than or equal to 45 °.
7. The projection lens of claim 4, wherein the split-screen mirror group comprises a first split-screen mirror (61) and a second split-screen mirror (62), the first split-screen mirror (61) having the first reflecting surface (64), the second split-screen mirror (62) having the second reflecting surface (65).
8. The projection lens of claim 4, wherein the split-screen lens group comprises a prism (63), the prism (63) has the first reflecting surface (64), the second reflecting surface (65) and a transmitting surface (66) connected in sequence, and two adjacent surfaces of the first reflecting surface (64), the second reflecting surface (65) and the transmitting surface (66) are arranged at an angle.
9. The projection lens of claim 1, wherein the reflective bowl lens (52) has a reflective curved surface, the reflective curved surface being concave, the reflective curved surface being configured to diverge light rays.
10. Projection lens according to claim 1, characterized in that the mirror group further comprises a mirror (51), the mirror (51) being located between the refractive mirror group (40) and the reflective bowl lens (52), the mirror (51) being arranged to reflect light rays of the refractive mirror group (40) to the reflective bowl lens (52).
11. Projection lens according to any one of claims 1 to 10, characterized in that the refractive lens group (40) comprises at least three lenses, a diaphragm and a drive motor, the at least three lenses comprising a first lens, a second lens and a third lens, the first to third lenses being arranged in sequence in a direction away from the visualization chip (10); the driving motor is in driving connection with the diaphragm so as to enable the aperture of the diaphragm to be adjustable; and/or the image source component further comprises an equivalent prism (20) and a galvanometer (30) which are sequentially arranged on the light emitting side of the imaging chip (10).
12. The projection lens according to any one of claims 1 to 10, characterized in that the light rays reflected by the reflecting bowl lens (52) form a projection image,
the projected image is divided into a first region (73) and a second region (74) in the longitudinal direction, the reflection surface covers one region of the first region (73) and the second region (74) so that the reflection surface reflects light rays of the region and forms the second projected image (72) in the second direction, and light rays which are not covered by the reflection surface on the other region of the first region (73) and the second region (74) form the first projected image (71) in the first direction; or alternatively
The projected image is divided into a first region (73) and a second region (74) in a lateral direction, and the reflecting surface covers one of the first region (73) and the second region (74) such that the reflecting surface reflects light of the one region and forms the second projected image (72) in the second direction, and light not covered by the reflecting surface from the other of the first region (73) and the second region (74) forms the first projected image (71) in the first direction.
13. The projection lens according to any one of claims 1 to 10, characterized in that the first projection image (71) and the second projection image (72) are displayed with the same or different content.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311647601.7A CN117492192A (en) | 2023-12-04 | 2023-12-04 | Projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311647601.7A CN117492192A (en) | 2023-12-04 | 2023-12-04 | Projection lens |
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| Publication Number | Publication Date |
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| CN117492192A true CN117492192A (en) | 2024-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311647601.7A Pending CN117492192A (en) | 2023-12-04 | 2023-12-04 | Projection lens |
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| TW201111897A (en) * | 2009-09-21 | 2011-04-01 | Young Optics Inc | Projection apparatus and multi-direction projection lens |
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| CN114077143A (en) * | 2021-10-29 | 2022-02-22 | 歌尔光学科技有限公司 | Projection device, control method of projection device and projection system |
| CN114077142A (en) * | 2021-10-29 | 2022-02-22 | 歌尔光学科技有限公司 | Projection device, control method of projection device and projection system |
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| TW201111897A (en) * | 2009-09-21 | 2011-04-01 | Young Optics Inc | Projection apparatus and multi-direction projection lens |
| CN103718104A (en) * | 2011-08-02 | 2014-04-09 | 3M创新有限公司 | Display system and method for projection onto multiple surfaces |
| CN105163011A (en) * | 2015-08-21 | 2015-12-16 | 广东欧珀移动通信有限公司 | Image pick-up module and electronic device |
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