CN213544932U - Ultrashort burnt projection optical lens and ultrashort burnt projection optical system - Google Patents
Ultrashort burnt projection optical lens and ultrashort burnt projection optical system Download PDFInfo
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- CN213544932U CN213544932U CN202022650303.1U CN202022650303U CN213544932U CN 213544932 U CN213544932 U CN 213544932U CN 202022650303 U CN202022650303 U CN 202022650303U CN 213544932 U CN213544932 U CN 213544932U
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Abstract
The utility model discloses an ultra short burnt projection optical lens and ultra short burnt projection optical system, wherein ultra short burnt projection optical lens include the casing and install in the casing inner chamber just in proper order fixed refractive lens group and an aspheric mirror of arranging on refraction projection direction, refractive lens group with correspond between the aspheric mirror and be in form an optical axis in the casing, wherein, refractive lens group includes first spherical lens, second aspheric lens, third spherical lens, fourth spherical lens, fifth spherical lens, sixth spherical lens, diaphragm, seventh spherical lens, eighth aspheric lens, ninth spherical lens, tenth aspheric lens, eleventh aspheric lens, twelfth spherical lens by thing side to picture side in proper order. The utility model provides an among the technical scheme, through setting up twelve piece at least refraction lens and an aspheric surface speculum for to projection lens's requirement is relatively lower in the aspect of processing and the dress precision.
Description
Technical Field
The utility model relates to an optical system field in the projection technology, concretely relates to ultrashort burnt projection optical lens and ultrashort burnt projection optical system.
Background
With the rapid development of the information age, large-screen projection display is used as an effective means for information output, and plays an increasingly important role in the life and work of people. The main principle of the projection display technology is that an image source generated by a display device is projected to a screen to generate a clear image after being amplified by an optical system. The ultra-short-focus projection lens can shorten the projection distance, realize the projection of a large screen, and provide an immersive impression experience for a user.
In order to realize short-focus large-screen projection, the field angle of the ultra-short-focus projection optical system is required to be larger and larger, and aberrations such as distortion, astigmatism, field curvature and the like related to the field angle are difficult to correct; on the other hand, in order to reduce the cost, the volume of the ultra-short focus projection lens is required to be smaller. The existing refraction type projection lens generally comprises a spherical or aspherical lens, in order to realize a large field angle, the complexity of the system needs to be increased to correct the optical aberration, the number of the refraction type projection optical system lenses is large, the structure is complex, the aberration is difficult to correct, the length of the system is difficult to compress, and the manufacturability is low. The conventional reflection-type projection lens generally comprises four or five aspheric reflectors, and then the purpose of compressing the projection distance is achieved by repeatedly folding the light path through the reflectors, but the projection lens with the structure type has higher requirements on processing and adjusting precision, which undoubtedly increases more difficulties for optical design, so that the optical design of the ultra-short-focus projection lens still is a difficult problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an ultrashort burnt projection optical lens and ultrashort burnt projection optical system aims at solving the problem that current ultrashort burnt projection optical lens structure is complicated, processing and dress accent required precision are high.
In order to achieve the above object, the utility model provides an ultra-short burnt projection optical lens, ultra-short burnt projection optical lens include the casing and install in casing inner chamber and the refraction lens group and an aspheric mirror of fixed arrangement in proper order on refraction projection direction, refraction lens group with correspond between the aspheric mirror and be in form an optical axis in the casing, wherein, refraction lens group includes first spherical lens, second aspheric lens, third spherical lens, fourth spherical lens, fifth spherical lens, sixth spherical lens, diaphragm, seventh spherical lens, eighth aspheric lens, ninth spherical lens, tenth aspheric lens, eleventh aspheric lens, twelfth spherical lens by thing side to picture side in proper order.
Optionally, the third spherical lens and the fourth spherical lens are connected by gluing, and the seventh spherical lens and the eighth aspheric lens are connected by gluing.
Optionally, the projection ratio of the ultra-short-focus projection lens is 0.1-0.4; and/or the presence of a gas in the gas,
the effective focal length of the ultra-short focus projection lens is-1.0 mm-1.8 mm when EFL is equal to-1.0 mm.
Optionally, the projection ratio of the ultra-short-focus projection lens is 0.2-0.3; and/or the presence of a gas in the gas,
the effective focal length of the ultra-short focus projection lens is-1.3 mm-1.5 mm.
Optionally, the first spherical lens power is positive; and/or the presence of a gas in the gas,
the focal power of the second aspheric lens is negative; and/or the presence of a gas in the gas,
the focal power of a cemented lens formed by the third spherical lens and the fourth spherical lens is positive; and/or the presence of a gas in the gas,
the focal power of the fifth spherical lens is negative; and/or the presence of a gas in the gas,
the focal power of the sixth spherical lens is positive; and/or the presence of a gas in the gas,
the focal power of a cemented lens composed of the seventh spherical lens and the eighth aspheric lens is negative; and/or the presence of a gas in the gas,
the focal power of the ninth spherical lens is positive; and/or the presence of a gas in the gas,
the tenth aspheric lens has negative focal power; and/or the presence of a gas in the gas,
the focal power of the eleventh aspheric lens is negative; and/or the presence of a gas in the gas,
the focal power of the twelfth spherical lens is negative.
Optionally, the aspheric mirror concave surface is disposed towards the refractive lens group.
The utility model also provides an ultrashort burnt projection optical system, include:
the ultra-short-focus projection optical lens comprises a shell, and a refraction lens group and an aspheric reflector which are arranged in an inner cavity of the shell and fixedly arranged in sequence in a refraction projection direction, wherein an optical axis is formed between the refraction lens group and the aspheric reflector in the shell correspondingly, and the refraction lens group sequentially comprises a first spherical lens, a second aspheric lens, a third spherical lens, a fourth spherical lens, a fifth spherical lens, a sixth spherical lens, a diaphragm, a seventh spherical lens, an eighth aspheric lens, a ninth spherical lens, a tenth aspheric lens, an eleventh aspheric lens and a twelfth spherical lens from an object side to an image side; and the number of the first and second groups,
the spatial light modulator is positioned at the object side of the ultra-short-focus projection optical lens;
wherein the ultra-short focus projection optical lens receives an image source generated by the spatial light modulator.
Optionally, the spatial light modulator includes a digital micromirror device, an offset of the digital micromirror device from an optical axis of the ultra-short focus projection optical lens is C, and 1.3< C < 1.5.
Optionally, in a direction along the optical axis, a distance from an image side surface of the refractive lens group to the aspheric mirror concave point is L1, a distance from the digital micromirror device to the aspheric mirror concave point is L2, and 0.3< L1/L2< 0.5.
Optionally, the ultra-short-focus projection optical system further includes a protective glass and a prism sequentially disposed from an object side to an image side along the optical axis, where the protective glass and the prism are located between the digital micromirror device and the refractive lens group, and the protective glass and the prism are coaxial with the optical axis.
In the technical scheme provided by the utility model, owing to adopt refraction lens group 1 to rectify main aberration, adopt aspheric surface reflector 2 to increase the optical path, be favorable to shortening the projection distance, and the reflector has lower transmittance, can realize the big image of short distance projection, and the image quality is high, and reduce the complexity of refraction lens group, reduce the aberration that refraction lens group self introduced, and the reflector does not introduce the chromatic aberration itself; by the arrangement of the diaphragm, light spots are reduced, and the image contrast is improved. Through setting up refraction lens group 1 with the combined design of aspheric surface speculum 2 is favorable to realizing ultrashort burnt projection, can turn over the light path through the speculum, shortens projection distance, simplifies the complexity of refraction lens group, has reduced machining precision and installation and debugging precision.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic view of a frame of an embodiment of an ultra-short focus projection optical lens provided in the present invention;
fig. 2 is a schematic view of a frame of an embodiment of an ultra-short focus projection optical system provided by the present invention;
fig. 3 is a schematic diagram of an optical path in the ultra-short-focus projection lens in fig. 2;
fig. 4 is a schematic diagram of a distortion diagram of the ultra-short-focus projection optical lens in fig. 2.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Ultra-short focus projection |
101 | First |
| 200 | Ultra-short focus projection |
102 | Second |
| 1000 | |
103 | Third |
| 1 | |
104 | Fourth |
| 2 | |
105 | Fifth |
| 3 | |
106 | Sixth spherical lens |
| 4 | |
107 | Seventh |
| 5 | |
108 | Eighth |
| 6 | Prism | 109 | Ninth |
| 11 | |
110 | Tenth |
| 12 | |
111 | Eleventh |
| 13 | |
112 | Twelfth spherical lens |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The optical path structure of the ultra-short focus projection system mainly comprises a refraction type and a reflection type. The refractive projection lens generally includes a spherical or aspherical lens, and in order to achieve a large field angle, it is necessary to increase the complexity of the system to correct the optical aberration. The existing reflection type projection lens generally comprises four or five aspheric surface reflectors, and then the purpose of compressing the projection distance is realized by repeatedly folding the light path through the reflectors, but the projection lens with the structure type has higher requirements on processing and adjusting precision.
The utility model provides an ultra-short burnt projection optical lens 100, fig. 1 to fig. 4 do the utility model provides an embodiment of ultra-short burnt projection optical lens 100.
Referring to fig. 1, the ultra-short-focus projection optical lens 100 includes a housing, and a refractive lens group 1 and an aspheric mirror 2 which are mounted in an inner cavity of the housing and fixedly disposed in sequence in a refractive projection direction, and an optical axis is formed between the refractive lens group 1 and the aspheric mirror 2 in the housing, where the refractive lens group 1 includes, in sequence from an object side to an image side, a first spherical lens 101, a second aspheric lens 102, a third spherical lens 103, a fourth spherical lens 104, a fifth spherical lens 105, a sixth spherical lens 106, a diaphragm 3, a seventh spherical lens 107, an eighth aspheric lens 108, a ninth spherical lens 109, a tenth aspheric lens 110, an eleventh aspheric lens 111, and a twelfth spherical lens 112.
The refraction lens group is adopted to correct main aberration, the aspheric reflector 2 is adopted, the projection distance is favorably shortened, the complexity of the refraction lens group 1 is reduced, the aberration introduced by the refraction lens group 1 is reduced, and the chromatic aberration is not introduced by the reflector; the combined design of the refraction lens group 1 and the aspheric reflector 2 is favorable for realizing ultra-short focus projection, and can effectively correct aberration introduced by a large field of view, thereby improving the imaging quality of projected images.
In the technical scheme provided by the utility model, owing to adopt refraction lens assembly 1 rectifies main aberration, adopt aspheric surface speculum 2 increases the optical path, is favorable to shortening the projection distance, and aspheric surface speculum 2 has lower transmittance, can realize the big image of short distance projection and image quality is high, and reduces refraction lens assembly's complexity, reduces the aberration that refraction lens assembly 1 self introduced, undertakes partial angle of view expansion task and rectifies the effect of distortion; by providing the diaphragm 3, flare is reduced and image contrast is improved. Through refraction lens group 1 with the combined design of aspheric surface speculum 2 is favorable to realizing ultrashort burnt projection, can turn over the light path through the speculum, shortens the projection distance, simplifies the complexity of refraction lens group, also makes ultrashort burnt projection optical lens 100 all reduces to some extent to the requirement of machining precision and dress accent precision to have low distortion, small, can realize the advantage of high image quality projection picture.
It should be noted that, in the optical design process, the functions and tasks achieved by the lens groups are grouped, and in this embodiment, the ultra-short-focus projection optical lens 100 includes three lens groups: a first lens group 11, a second lens group 12, and a third lens group 13. The first lens group 11 includes a first spherical lens 101 and a second spherical lens 102; the second lens group 12 includes a third spherical lens 103, a fourth spherical lens 104, a fifth spherical lens 105, a sixth spherical lens 106, a stop 3, a seventh spherical lens 107, and an eighth spherical lens 108; the third lens group 13 includes a ninth spherical lens 109, a tenth spherical lens 110, an eleventh spherical lens 111, and a twelfth spherical lens 112. How the division is made and the task of each lens group are not described here.
Specifically, in order to reduce or eliminate chromatic aberration to the maximum, in this embodiment, the third spherical lens 103 and the fourth spherical lens 104 are cemented, the seventh spherical lens 107 and the eighth aspheric lens 108 are cemented, and two lenses made of different materials are cemented together by means of lens cementing, so as to correct chromatic dispersion of glass, and the performance of imaging in polychromatic (white light) is greatly improved compared with that of a single lens.
In the embodiment of the present application, the effective focal length of the ultra-short focus projection lens 100 is-1.0 mm to-1.8 mm, or the throw ratio of the ultra-short focus projection lens 100 is 0.1 to 0.4.
Of course, the effective focal length of the ultra-short focus projection lens 100 is-1.0 mm to-1.8 mm, and the projection ratio is 0.1 to 0.4, the ultra-short focus projection can be better realized.
Further, in the embodiment of the present application, the effective focal length of the ultra-short-focus projection lens 100 is-1.3 mm to-1.5 mm; or the projection ratio of the ultra-short focus projection lens 100 is 0.2-0.3.
Of course, the effective focal length of the ultra-short-focus projection lens 100 is from-1.3 mm to-1.5 mm, and the ultra-short-focus projection effect achieved is more appreciable under the condition that the projection ratio is 0.2 to 0.3.
Note that, in the embodiment of the present application, the optical power of the first spherical lens 101 is positive; or, the focal power of the second aspheric lens 102 is negative, or the focal power of the cemented lens composed of the third spherical lens 103 and the fourth spherical lens 104 is positive, or the focal power of the fifth spherical lens 105 is negative, or the focal power of the sixth spherical lens 106 is positive, or the focal power of the cemented lens composed of the seventh spherical lens 107 and the eighth aspheric lens 108 is negative, or the focal power of the ninth spherical lens 109 is positive, or the focal power of the tenth aspheric lens 110 is negative, or the focal power of the eleventh aspheric lens 111 is negative, or the focal power of the twelfth spherical lens 112 is negative, and the refractive lens group 1 finally enables the ultra-short-focus projection lens 100 to achieve the transmittance by adjusting the respective focal powers.
Of course, the focal power of the first spherical lens 101 is positive, the focal power of the second spherical lens 102 is negative, the focal power of the cemented lens composed of the third spherical lens 103 and the fourth spherical lens 104 is positive, the focal power of the fifth spherical lens 105 is negative, the focal power of the sixth spherical lens 106 is positive, the focal power of the cemented lens composed of the seventh spherical lens 107 and the eighth spherical lens 108 is negative, the focal power of the ninth spherical lens 109 is positive, the focal power of the tenth spherical lens 110 is negative, the focal power of the eleventh spherical lens 111 is negative, and the focal power of the twelfth spherical lens 112 is negative, so that the distribution of the focal powers is more reasonable under the condition of realizing the throw ratio. Here, it should be noted that: the power, which is equal to the difference between the image-side and object-side beam convergence, characterizes the ability of the optical system to deflect light.
Further, in order to shorten the projection distance, an image refracted by the refraction lens assembly 1 is projected on a screen 1000, please refer to fig. 3, in an embodiment of the present application, the concave surface of the aspheric mirror 2 is disposed toward the refraction lens assembly 1, and the aspheric mirror 2 reflects the image from the refraction lens assembly 1, so that the image is projected on the screen 1000 toward which the concave surface of the aspheric mirror 2 faces.
The utility model provides an ultrashort burnt projection optical system 200, please refer to and draw together fig. 2 to fig. 4, in this embodiment, ultrashort burnt projection optical system 200 includes foretell ultrashort burnt projection optical lens 100 and spatial light modulator, spatial light modulator is located ultrashort burnt projection optical lens 100's thing side, ultrashort burnt projection optical lens 100 receives the image source that comes from spatial light modulator production, ultrashort burnt projection optical system 200 includes foretell ultrashort burnt projection optical lens 100's whole technical characterstic, consequently, also has the technical effect that above-mentioned whole technical characterstic brought, and here is no longer repeated one by one:
further, the spatial light modulator includes a Digital Micromirror Device 4, i.e. a DMD chip (Digital Micromirror Device, which achieves the purpose of displaying images by controlling the turning on and off of the mirror plates). The offset of the digital micromirror device 4 from the optical axis of the ultra-short-focus projection optical lens 100 is C, and 1.3< C < 1.5.
Further, in the direction along the optical axis, the distance from the image side surface of the refractive lens group 1 to the concave point of the aspherical mirror 2 is L1, the distance from the digital micromirror device 4 to the concave point of the aspherical mirror 2 is L2, and 0.3< L1/L2< 0.5.
Further, because it is not the etching circuit but a large amount of micro-reflectors to be located in the core of the DMD chip, these micro-reflectors can face light while being fragile, therefore, the ultra-short-focus projection optical system 200 is further provided with a protective glass 5 and a prism 6 in sequence from the object side to the image side along the optical axis, wherein the protective glass 5 and the prism 6 are located between the digital micromirror device 4 and the refraction lens group 1, the protective glass 5 and the prism 6 are coaxial with the optical axis, and therefore the protective glass 5 has high light transmittance and high hardness, so that the micro-reflectors can be well protected.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. The utility model provides an ultra-short burnt projection optical lens, its characterized in that, include the casing with install in the casing inner chamber just is in the refraction projection direction in proper order fixed arrangement's refraction lens group and an aspheric mirror, the refraction lens group with correspond between the aspheric mirror and be in form an optical axis in the casing, wherein, the refraction lens group includes first spherical lens, second aspheric lens, third spherical lens, fourth spherical lens, fifth spherical lens, sixth spherical lens, diaphragm, seventh spherical lens, eighth aspheric lens, ninth spherical lens, tenth aspheric lens, eleventh aspheric lens, twelfth spherical lens by thing side to picture side in proper order.
2. The ultra-short-focus projection optical lens of claim 1, wherein the third spherical lens and the fourth spherical lens are cemented, and the seventh spherical lens and the eighth aspheric lens are cemented.
3. The ultra-short-focus projection optical lens of claim 1, wherein the projection ratio of the ultra-short-focus projection lens is 0.1 to 0.4; and/or the presence of a gas in the gas,
the effective focal length of the ultra-short focus projection lens is-1.0 mm-1.8 mm when EFL is equal to-1.0 mm.
4. The ultra-short-focus projection optical lens of claim 3, wherein the projection ratio of the ultra-short-focus projection lens is 0.2 to 0.3; and/or the presence of a gas in the gas,
the effective focal length of the ultra-short focus projection lens is-1.3 mm-1.5 mm.
5. The ultra-short-focus projection optical lens of claim 2, wherein the first spherical lens power is positive; and/or the presence of a gas in the gas,
the focal power of the second aspheric lens is negative; and/or the presence of a gas in the gas,
the focal power of a cemented lens formed by the third spherical lens and the fourth spherical lens is positive; and/or the presence of a gas in the gas,
the focal power of the fifth spherical lens is negative; and/or the presence of a gas in the gas,
the focal power of the sixth spherical lens is positive; and/or the presence of a gas in the gas,
the focal power of a cemented lens composed of the seventh spherical lens and the eighth aspheric lens is negative; and/or the presence of a gas in the gas,
the focal power of the ninth spherical lens is positive; and/or the presence of a gas in the gas,
the tenth aspheric lens has negative focal power; and/or the presence of a gas in the gas,
the focal power of the eleventh aspheric lens is negative; and/or the presence of a gas in the gas,
the focal power of the twelfth spherical lens is negative.
6. The ultra-short focus projection optical lens of claim 1, wherein the aspheric mirror concave surface is disposed toward the refractive lens group.
7. An ultra-short-focus projection optical system, comprising:
an ultra-short-focus projection optical lens, which is the ultra-short-focus projection optical lens claimed in any one of claims 1 to 6; and the number of the first and second groups,
the spatial light modulator is positioned at the object side of the ultra-short-focus projection optical lens;
wherein the ultra-short focus projection optical lens receives an image source generated by the spatial light modulator.
8. The ultra-short focus projection optical system of claim 7, wherein the spatial light modulator comprises a digital micromirror device, the offset of the digital micromirror device from the optical axis of the ultra-short focus projection optical lens is C, and 1.3< C < 1.5.
9. The ultra-short focus projection optical system of claim 8, wherein a distance from an image side surface of the refractive lens group to the aspherical mirror concave point in a direction along the optical axis is L1, a distance from the digital micromirror device to the aspherical mirror concave point is L2, and 0.3< L1/L2< 0.5.
10. The ultra-short-focus projection optical system of claim 8, further comprising a protective glass and a prism in order from an object side to an image side along the optical axis, wherein the protective glass and the prism are located between the digital micromirror device and the refractive lens group, and the protective glass and the prism are coaxial with the optical axis.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022650303.1U CN213544932U (en) | 2020-11-16 | 2020-11-16 | Ultrashort burnt projection optical lens and ultrashort burnt projection optical system |
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|---|---|---|---|
| CN202022650303.1U CN213544932U (en) | 2020-11-16 | 2020-11-16 | Ultrashort burnt projection optical lens and ultrashort burnt projection optical system |
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| CN213544932U true CN213544932U (en) | 2021-06-25 |
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| CN (1) | CN213544932U (en) |
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