CN113359277B - Optical system and projection apparatus - Google Patents
Optical system and projection apparatus Download PDFInfo
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- CN113359277B CN113359277B CN202110606689.2A CN202110606689A CN113359277B CN 113359277 B CN113359277 B CN 113359277B CN 202110606689 A CN202110606689 A CN 202110606689A CN 113359277 B CN113359277 B CN 113359277B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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Abstract
The invention discloses an optical system and a projection device. The optical system comprises a display module, a first lens group, a diaphragm, a second lens group and a third lens group. The first lens group is used for photopolymerizing the light emitted by the display module into an intermediate image; the second lens group is used for passing and converging the light passing through the diaphragm; the third lens group is used for carrying out enlarged projection on the aggregated intermediate image; wherein, first battery of lens includes that it sets gradually along the light-emitting direction: at least one positive lens and a first cemented lens; the first cemented lens is a lens with positive focal power formed by a negative lens and a positive lens which are cemented together. The light emitted by the display module is adjusted through the first lens group, the second lens group and the third lens group, and the total focal length of the finally formed optical system is 4mm or less.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an optical system and projection equipment.
Background
The micro projection technology is a projection technology for miniaturizing and carrying a conventional projection system. In the technical field of micro projection, micro projection equipment is gradually developed towards the direction of short focus and even ultra-short focus on the premise of ensuring miniaturization, portability and high brightness. In the existing micro-projection equipment, a long-focus lens is often adopted, and when the equipment is applied, a sufficient projection distance needs to be reserved in the space. In a real scene, a sufficient projection distance cannot be reserved, so that the projection equipment cannot project correctly.
Disclosure of Invention
The embodiment of the invention mainly aims to provide an optical system and a projection device, aiming at overcoming the defect that the projection device needs to reserve a longer projection distance, and the total focal length of the optical system is shortened by arranging a first lens group, a second lens group and a third lens group, so that the length of the reserved projection distance is shortened.
In order to solve the above-described problems, an optical system according to the present invention includes: display module assembly, first battery of lens, diaphragm, second battery of lens and third battery of lens. The first lens group is arranged in the light emergent direction of the display module and is used for photopolymerization emitted by the display module to form an intermediate image; the diaphragm is arranged on one side of the first lens group, which deviates from the display module; the second lens group is arranged on one side of the diaphragm, which is far away from the first lens group, and is used for passing and converging light passing through the diaphragm; the third lens group is arranged on one side of the second lens group, which is far away from the diaphragm, and is used for magnifying and projecting the aggregated intermediate image; wherein, first battery of lens includes that it sets gradually along the light-emitting direction: at least one positive lens and a first cemented lens; the first cemented lens comprises a negative lens and a positive lens which are sequentially cemented along a light-emitting direction, and the cemented lens has positive focal power.
Further, the first lens group comprises the following components arranged in sequence along the light emitting direction: a first positive lens, a second positive lens, a third negative lens, a fourth positive lens; the fourth positive lens is cemented with the third negative lens to form the first cemented lens.
Further, the focal length of the first cemented lens ranges from-25 mm to-10 mm; and/or the focal length of the first positive lens ranges from 5mm to 15 mm; and/or the focal length of the second positive lens 22 ranges between 5mm and 15 mm.
Further, the second lens group includes along the light-emitting direction set gradually: the fifth negative lens and the sixth positive lens are glued to form a second cemented lens, and the focal length of the second cemented lens ranges from 5mm to 15 mm.
Further, the third lens group includes that it sets gradually along the light-emitting direction: seventh negative lens, eighth negative lens.
Further, the focal length of the seventh negative lens ranges from-12 mm to-5 mm; and/or the focal length of the eighth negative lens ranges from-15 mm to-10 mm.
Furthermore, the first positive lens is made of glass, the first positive lens comprises a first surface and a second surface which are arranged oppositely, the first surface is a light incident surface of the first positive lens, the second surface is a light emergent surface of the first positive lens, and the first surface and the second surface are aspheric surfaces.
Further, the material of eighth negative lens is plastics, eighth negative lens includes along the relative third surface and the fourth surface that sets up of light-emitting direction, the third surface is the income plain noodles of eighth negative lens, the fourth surface is the play plain noodles of eighth negative lens, the third surface reaches the fourth surface is the aspheric surface.
Further, the total focal length of the optical lens is less than or equal to 4 mm.
The invention also proposes a projection device comprising an optical system as described above.
The embodiment of the invention provides an optical system and projection equipment. The display module is used for modulating light to form image light, when the image light is transmitted to the first lens group, the positive lens of the first lens group firstly converges the image light, and the first cemented lens has the effect of eliminating chromatic aberration and can eliminate chromatic aberration existing in the converged image light; the image light passing through the first lens group forms an intermediate image on the diaphragm, the diaphragm adjusts the intermediate image and irradiates the second lens group through the diaphragm, the intermediate image is converged again through the second lens group and finally irradiates the third lens group, and the third lens group is diffused and finally irradiates the screen to form an image. The light emitted by the display module is adjusted through the first lens group, the second lens group and the third lens group, and the total focal length of the finally formed optical system is 4mm or less, so that the longer projection distance does not need to be reserved when the optical system is applied, and the application scene of the optical system is increased.
Drawings
FIG. 1 is a schematic diagram of an optical system according to the present invention;
FIG. 2 is a schematic diagram of light transmission of the optical system of the present invention;
FIG. 3 is a diagram of field curvature and optical distortion of an optical system according to the present invention;
FIG. 4 is a diagram of the modulation transfer function of the optical system of the present invention;
FIG. 5 is a vertical axis chromatic aberration diagram of a projection optical system of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | |
50 | |
| 20 | |
51 | Seventh negative lens |
| 21 | A first |
52 | Eighth |
| 22 | Second |
211 | |
| 23 | Third |
212 | |
| 24 | Fourth |
521 | |
| 30 | |
522 | The |
| 40 | |
11 | |
| 41 | Fifth |
12 | |
| 42 | Sixth |
13 | Equivalent turning prism |
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1, the present invention provides an optical system, including: the lens comprises a display module 10, a first lens group 20, a diaphragm 30, a second lens group 40 and a third lens group 50. The first lens group 20 is arranged in the light emitting direction of the display module 10 and is used for forming an intermediate image by photopolymerization emitted by the display module 10; the diaphragm is arranged on one side of the first lens group 20 departing from the display module 10; the second lens group 40 is arranged on the side of the diaphragm 30 facing away from the first lens group 20 and is used for passing and converging light passing through the diaphragm 30; the third lens group 50 is arranged on one side of the second lens group 40, which is far away from the diaphragm 30, and is used for magnifying and projecting the aggregated intermediate image; wherein, the first lens group 20 includes the following components arranged in sequence along the light emitting direction: at least one positive lens and a first cemented lens; the first cemented lens comprises a negative lens and a positive lens which are cemented in sequence along the light-emitting direction, and the cemented lens has positive focal power.
In the specific embodiment, the display module 10 of the present invention is used for modulating light to form image light, when the image light is transmitted to the first lens group 20, the positive lens of the first lens group 20 firstly converges the image light, and the first cemented lens has an effect of eliminating chromatic aberration, and can eliminate chromatic aberration existing in the converged image light; the image light passing through the first lens group 20 forms an intermediate image on the stop 30, and the stop 30 adjusts the intermediate image and irradiates the intermediate image on the second lens group 40 through the stop 30, and performs refocusing processing on the intermediate image by the second lens group 40, and finally irradiates the intermediate image on the third lens group 50, and the third lens group 50 performs diffusion processing, and finally irradiates the intermediate image on a screen to form an image. The light emitted by the display module 10 is adjusted by the first lens group 20, the second lens group 40 and the third lens group 50, and the total focal length of the finally formed optical system is 4mm or less. Preferably, the total focal length of the optical system is 3.3 mm.
The positive lens has a light-condensing effect on light, is a lens having positive refractive power, and means that when parallel light rays pass through the lens, the light rays converge in a direction close to the axis. The negative lens has a diverging effect on light, and is also called as a diverging lens, which means that when parallel light rays pass through the lens, the light rays converge towards a direction away from the axis.
Further, the first lens group 20 includes, in order in the light exit direction: a first positive lens 21, a second positive lens 22, a third negative lens 23, and a fourth positive lens 24; the fourth positive lens 24 is cemented with the third negative lens 23 to form a first cemented lens.
In the specific embodiment, it should be noted that the first positive lens 21 and the second positive lens 22 are sequentially arranged along the light emitting direction, and the light is focused in a short distance by the positive lenses, which is beneficial to shortening the total focal length. The first positive lens 21 is a biconvex positive lens, the second positive lens 22 is also a biconvex positive lens, the third negative lens 23 is a biconcave negative lens, two opposite concave surfaces of the third negative lens 23 face the second positive lens 22 and the fourth positive lens 24 respectively, the fourth positive lens 24 is a biconvex positive lens, a concave surface of the third negative lens 23 is cemented with a convex surface of the fourth positive lens 24 to form a first cemented lens,
further, the focal length of the first cemented lens ranges from-25 mm to-10 mm; and/or the focal length of the first positive lens 21 ranges from 5mm to 15 mm; and/or the focal length of the second positive lens 22 ranges between 5mm and 15 mm.
Specifically, the shortest distance between the first positive lens 21 and the second positive lens 22 is 0.2 mm; the shortest distance between the second positive lens 22 and the first cemented lens is 0.5 mm; the distance between the first cemented lens and the diaphragm 30 is at least 2.3 mm.
Further, the second lens group 40 includes, in order along the light exit direction: and the fifth negative lens 41 and the sixth positive lens 42 are bonded together, and the fifth negative lens 41 and the sixth positive lens 42 are bonded together to form a second cemented lens, and the focal length of the second cemented lens ranges from 5mm to 15 mm.
In a specific embodiment, the fifth negative lens 41 is a meniscus negative lens, the sixth positive lens 42 is a double convex positive lens, and the concave surface of the fifth negative lens 41 faces the sixth positive lens 42 and is cemented with the convex surface of the sixth positive lens 42 to form a second cemented lens having positive optical power.
Specifically, the minimum distance between the second cemented lens and the first cemented lens is 4.6 mm. The shortest distance between the second cemented lens and the diaphragm 30 is 2.3 mm.
Further, the third lens group 50 includes, in order along the light exit direction: a seventh negative lens 51, an eighth negative lens 52.
In the embodiment, the seventh negative lens 51 and the eighth negative lens 52 are used to diffuse the irradiated light beam so that the light beam can be projected in a large area.
Further, the focal length of the seventh negative lens 51 ranges from-12 mm to-5 mm; and/or the focal length of the eighth negative lens 52 ranges from-15 mm to-10 mm.
In a specific embodiment, the seventh negative lens 51 is a biconcave negative lens, and the eighth negative lens 52 is a meniscus negative lens; the two opposing concave surfaces of the seventh negative lens 51 face the eighth negative lens 52 and the second cemented lens, respectively. The concave surface of the eighth negative lens 52 faces the seventh negative lens 51. The focal length range of the seventh negative lens 51 is-12 mm to-5 mm; the focal length of the eighth negative lens 52 ranges from-15 mm to-10 mm.
Specifically, the shortest distance between the seventh negative lens 51 and the second cemented lens is 0.8mm, and the shortest distance between the seventh negative lens 51 and the eighth negative lens 52 is 9.0 mm.
Based on the optical imaging principle, using optical design software, according to the focal length formula of the combined lens: r ═ R 1 +R 2 -dR 1 R 2 。
Wherein R is the reciprocal of the focal length of the first and second lens combination, R 1 、R 2 Is the reciprocal of the focal length of the first and second lenses, and d is the distance between the lenses. It can be seen that the total focal length of the lens assembly composed of the first lens assembly 20, the second lens assembly 40 and the third lens assembly 50 is less than or equal to 3.3 mm.
Further, the material of the first positive lens 21 is glass, the first positive lens 21 includes a first surface 211 and a second surface 212 that are disposed opposite to each other, the first surface 212 is a light incident surface of the first positive lens 21, the second surface 212 is a light emitting surface of the first positive lens 21, and the first surface 211 and the second surface 212 are aspheric surfaces.
In the specific embodiment, compared with a spherical structure, the aspheric structure can effectively reduce spherical aberration and distortion of the optical system. In the prior art, a plurality of lenses are arranged for eliminating chromatic aberration, and the invention is further used for eliminating chromatic aberration by arranging an aspheric surface; thereby reducing the number of lenses in the optical system and reducing the size of the lenses. The materials of the first positive lens 21, the second positive lens 22, the third negative lens 23, the fourth positive lens 24, the fifth negative lens 41, the sixth positive lens 42, and the seventh negative lens 51 are all glass materials.
Further, the eighth negative lens 52 is made of plastic, the eighth negative lens 52 includes a third surface 521 and a fourth surface 522 that are disposed oppositely, the third surface 521 is a light incident surface of the eighth negative lens 52, the fourth surface 522 is a light emergent surface of the eighth negative lens 52, and the third surface 521 and the fourth surface 522 are aspheric surfaces.
In the specific embodiment, compared with a spherical structure, the aspheric structure can effectively reduce spherical aberration and distortion of the optical system. In the prior art, a plurality of lenses are arranged for eliminating chromatic aberration, and the invention is further used for eliminating chromatic aberration by arranging an aspheric surface; thereby reducing the number of lenses in the optical system and reducing the size of the lenses. The eighth negative lens 52 is made of plastic material, so that the production cost can be effectively reduced.
Further, the total focal length of the optical lens is less than or equal to 4 mm.
In a specific embodiment, preferably, the total focal length of the optical lens is equal to 3.3mm, which is beneficial to applying the optical system in various scenes.
The display module 10 includes a display chip 11, a protection glass 12 and an equivalent turning prism 13, wherein the protection glass 12 is disposed in the light-emitting direction of the display chip 11, and the equivalent turning prism 13 is disposed between the protection glass 12 and the first lens group 20. The equivalent turning prism 13 is used for transmitting the light emitted or reflected by the display chip 11 to the first lens group 2; the protective glass 12 is used to protect the display chip 11 from external contaminants and also to prevent the display chip 11 from being damaged by external forces.
In the present embodiment, the parameters of the optical system are as follows:
the total lens length of the optical system is 49 mm;
the total focal length of the optical system is less than or equal to 3.3 mm;
the half-image height of the optical system is 2.95 mm;
the half-field of the optical system is 41.7 degrees;
the F # of the optical system is 1.7;
the chief ray angle of the optical system is less than 0.9 deg..
Referring to fig. 3, fig. 3 is a graph of field curvature and optical distortion, where the field curvature is used to indicate the position change of a beam image point of different view field points away from an image side, and the optical distortion is the vertical axis distance between a principal ray at a dominant wavelength of a certain view field and an ideal image point of the image side focus; in an embodiment, the wavelength of the lens group is selected in the range of 455nm to 613nm, wherein the field curvature in both the tangential plane and the sagittal plane is less than ± 0.05mm, and the optical distortion in the full field of view is between 0% and 0.9%, so that the distortion of the projected image of the system is not noticeable to the human eye, and no further electronic calibration of the display chip is required to correct the distortion.
Referring to fig. 4, fig. 4 is a Modulation Transfer Function (MTF) graph, wherein the MTF is a relationship between Modulation degree and a line-per-millimeter logarithm in an image for evaluating detail reduction capability of a scene. Higher values of the vertical axis of the modulation transfer function indicate higher resolution. In an embodiment, the wavelength of the lens group is selected to be in a range of 455nm to 613nm, and the lens group shows modulation transfer function values in a Tangential direction (T) and a Sagittal direction (S) when half-images are respectively 0mm, 0.523mm, 0.783mm, 1.882mm, 2.3058mm and 2.95mm, specifically, values of modulation transfer functions of spatial frequencies 0lp/mm to 93lp/mm are between 0.5 and 1.0, and values of modulation transfer functions of central field of view are between 0.62 and 1.0, which indicates that the resolution of the final projection image is high, and the lens group has excellent optical performance.
Referring to fig. 5, fig. 5 is a vertical axis chromatic aberration diagram of a projection optical system, and a vertical axis chromatic aberration diagram of the projection optical system, wherein the vertical axis chromatic aberration is also called magnification chromatic aberration, mainly refers to a polychromatic main light of an object side, which is dispersed by a refraction system and is converted into a plurality of light rays when being emitted from an image side, and a difference value of focus positions of hydrogen blue light and hydrogen red light on an image plane is shown; if the pixel size of the optical system is 5.4um, the lateral chromatic aberration of the lens in the full-view visible light band is within 0.6 pixel range, which is hard to be perceived by human eyes.
The design data of the optical system is shown in the following table 1:
TABLE 1
y is the central height of the mirror surface, Z is the position of the aspheric surface structure with the height of Y along the optical axis direction, the surface vertex is taken as the displacement value of the reference distance from the optical axis, C is the vertex curvature radius of the aspheric surface, and K is the cone coefficient; α 1, α 2, α 3, and α 4 are aspherical high-order coefficient of the aspherical lens. Specifically as described in table 2.
TABLE 2
The invention also proposes a projection device comprising an optical system as described above. In a particular embodiment, the display chip 11 is used to emit light with image information in the projection device.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. An optical system, comprising:
a display module;
the first lens group is arranged in the light emergent direction of the display module and is used for photopolymerization emitted by the display module to form an intermediate image;
the diaphragm is arranged on one side, away from the display module, of the first lens group;
the second lens group is arranged on one side of the diaphragm, which is far away from the first lens group, and is used for passing and converging the light passing through the diaphragm; and
the third lens group is arranged on one side, away from the diaphragm, of the second lens group and is used for magnifying and projecting the aggregated intermediate image;
wherein, first battery of lens includes that it sets gradually along the light-emitting direction: at least one positive lens and a first cemented lens; the first cemented lens comprises a negative lens and a positive lens which are sequentially cemented along a light-emitting direction, and the cemented lens has positive focal power;
the second lens group includes fifth negative lens and sixth positive lens that set gradually along the light-emitting direction, the fifth negative lens with sixth positive lens glues mutually and forms second cemented lens, second cemented lens's focus scope is 5mm to 15 mm.
2. The optical system according to claim 1, wherein the first lens group comprises, in order along a light exit direction: a first positive lens, a second positive lens, a third negative lens, a fourth positive lens; the fourth positive lens is cemented with the third negative lens to form the first cemented lens.
3. The optical system according to claim 2, wherein the focal length of the first cemented lens ranges from-25 mm to-10 mm; and/or
The focal length range of the first positive lens is 5mm to 15 mm; and/or
The focal length range of the second positive lens is between 5mm and 15 mm.
4. The optical system according to claim 1, wherein the third lens group comprises, in order along a light exit direction: seventh negative lens, eighth negative lens.
5. The optical system of claim 4, wherein the seventh negative lens has a focal length in a range of-12 mm to-5 mm; and/or the focal length of the eighth negative lens ranges from-15 mm to-10 mm.
6. The optical system of claim 2, wherein the first positive lens is made of glass, the first positive lens includes a first surface and a second surface opposite to each other, the first surface is a light incident surface of the first positive lens, the second surface is a light emergent surface of the first positive lens, and the first surface and the second surface are aspheric surfaces.
7. The optical system according to claim 4, wherein the eighth negative lens is made of plastic, the eighth negative lens includes a third surface and a fourth surface opposite to each other along the light exit direction, the third surface is a light entrance surface of the eighth negative lens, the fourth surface is a light exit surface of the eighth negative lens, and the third surface and the fourth surface are aspheric surfaces.
8. The optical system of claim 1, wherein the total focal length of the optical system is less than or equal to 4 mm.
9. A projection device, characterized in that the projection device comprises an optical system as claimed in any one of claims 1 to 8.
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| CN114690377B (en) * | 2022-03-31 | 2024-03-19 | 歌尔光学科技有限公司 | Optical projection system and electronic equipment |
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| CN110187470A (en) * | 2019-04-09 | 2019-08-30 | 歌尔股份有限公司 | Projection lens, projection optical system and projection device |
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| CN111596511A (en) * | 2020-06-24 | 2020-08-28 | 歌尔光学科技有限公司 | Optical system and projection device |
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| TW201137497A (en) * | 2010-04-30 | 2011-11-01 | E Pin Optical Industry Co Ltd | Four-piece projection lens system and the projection apparatus using the same |
| CN103472586B (en) * | 2013-09-18 | 2015-06-24 | 中国科学院光电技术研究所 | Projection optical system |
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| JP2011221089A (en) * | 2010-04-05 | 2011-11-04 | Fujifilm Corp | Projecting wide-angle lens and projection display device |
| CN110187470A (en) * | 2019-04-09 | 2019-08-30 | 歌尔股份有限公司 | Projection lens, projection optical system and projection device |
| CN110161656A (en) * | 2019-05-31 | 2019-08-23 | 宁波永新光学股份有限公司 | A kind of vehicle-mounted high-definition wide angle imaging system |
| CN111596511A (en) * | 2020-06-24 | 2020-08-28 | 歌尔光学科技有限公司 | Optical system and projection device |
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