CN217521433U - Mixed type LCD projection lens - Google Patents
Mixed type LCD projection lens Download PDFInfo
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- CN217521433U CN217521433U CN202221634022.XU CN202221634022U CN217521433U CN 217521433 U CN217521433 U CN 217521433U CN 202221634022 U CN202221634022 U CN 202221634022U CN 217521433 U CN217521433 U CN 217521433U
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Abstract
The utility model discloses a mixed LCD projection lens, which comprises a first lens group, a second lens group and a third lens which are arranged from a screen end to an LCD end in sequence; the first lens group comprises 1 or 2 or more than two plastic aspheric lenses; the second lens group comprises 1 or 2 spherical glass lenses; the third lens is a thin Fresnel lens; a diaphragm is arranged between the first lens group and the second lens group; the utility model discloses a mixture of two kinds of lenses, the high advantage of existing glass lens transmissivity has the characteristics that the plastic lens is with low costs, production efficiency is high again, the utility model discloses the lens is small in quantity, and the cost is lower, and projection display image is even clear, and the quality is better, satisfies the demand of market to high image quality.
Description
Technical Field
The utility model relates to a projection lens field, concretely relates to mixed type LCD projection lens.
Background
The projection display technology is a display mode in which an image generated by a display device is projected onto a screen through an optical system to generate an image. The high-performance projection display technology is mainly characterized by large screen, high output brightness, high image resolution and the like. Early projection systems were bulky, heavy, costly and limited in application. In recent years, with the development of display devices, light sources, and various optical systems, the size and weight of projection apparatuses have been greatly reduced, the cost has been decreasing, and the application fields have been rapidly expanded. At present, the application of various projection display devices covers a plurality of fields from high-end military command, large-scale conferences, display devices for simulation training and the like, to public place audio-visual devices, middle and small office conference devices, teaching devices, consumer-grade household multimedia high-definition televisions and the like. In summary, projection displays have become a mainstream product for large screen displays. The existing projection lens has more glass lenses, greatly increases the weight of the lens, and has more complex structure, high price and low imaging quality.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a technical scheme does: a mixed LCD projection lens comprises a first lens group, a second lens group and a third lens which are arranged in sequence from a screen end to an LCD end;
the first lens group comprises 1 or 2 or more than two plastic aspheric lenses;
the second lens group comprises 1 or 2 spherical glass lenses;
the third lens is a thin Fresnel lens;
and a diaphragm is arranged between the first lens group and the second lens group.
Preferably, the spherical glass lens of the second lens group is at least one of the following three materials:
(1) H-LaK 7-7A, refractive index Nd-1.7300, and dispersion coefficient Vd-53.83;
(2) h to ZK11, refractive index Nd 1.63854, and dispersion coefficient Vd 55.45;
(3) h to ZF2, refractive index Nd 167270, and dispersion coefficient Vd 32.17.
Preferably, when the LCD is smaller than 3 inches, the second lens group adopts a spherical glass lens with the refractive index Nd smaller than 1.64; when the LCD is larger than 3 inches, the second lens group adopts a spherical glass lens with the refractive index Nd smaller than 1.74.
Preferably, the focal length value of the thin fresnel lens ranges from 0.8 to 1 times of the focal length value of the lens.
Preferably, when the number of the lenses of the first lens group and the second lens group is 2-3, the relative aperture range of the projection lens is below F2.4; when the number of the lenses of the first lens group and the second lens group is 4, the relative aperture range of the projection lens is below F2.3.
Preferably, when the projection lens uses a reflector, the distance from the surface of the lens at the end of the second lens group far away from the screen end to the thin fresnel lens is greater than 0.9 times of the size of the LCD; when the projection lens does not use a reflector, the distance from the surface of the lens at one end of the second lens group far away from the screen end to the thin Fresnel lens is less than 0.8 times of the size of the LCD.
Preferably, the diameter range of the plastic aspheric lens is 20-75; the radius value range of the surface of the glass lens is-15 to-800 mm or 15 to 800 mm.
Preferably, the weight of the wavelength range of the projection lens is: r: 656.8nm, weight 80; g: 587.56nm, weight 100; b: 486.13nm weight 60.
Preferably, the K value of the plastic aspheric lens ranges from-0.3 to-30 or ranges from 0.3 to 30; the order number of the aspheric surface equation of the plastic lens is 6 to 12.
Preferably, the surface shape precision of the plastic aspheric lens is as follows: when the effective aperture of the plastic aspheric lens is less than 30, the surface form precision is less than 5 microns; when the effective aperture of the plastic aspheric lens is less than 45, the surface type precision is less than 7 microns; when the effective aperture of the plastic aspheric lens is less than 60, the surface form precision is less than 10 microns; when the effective aperture of the plastic aspheric lens is larger than 60, the surface form precision is less than 12 microns.
After the scheme more than adopting, the utility model has the advantages of as follows:
(1) the utility model discloses a mixed lens group is moulded to glass, both can remain the luminous flux of lens and can reduce the manufacturing cost of camera lens again.
(2) The utility model can clearly project 2-5.8 inches LCD pictures on a screen with a specified distance by combining the aspheric lens and the spherical lens, and solves the problems of uneven brightness on the projection screen and image width size change during focusing;
(3) the utility model discloses an aspheric surface lens adopts special structural parameter for the quality of image of camera lens, the distortion reaches the quality level of high-quality camera lens.
(4) The utility model discloses an improve camera lens incidence pupil diameter for the F number of camera lens is less than 2.4, has improved the luminance on the projector screen.
(5) The utility model discloses according to the specification of camera lens focus liquid crystal display, scientific and reasonable's selection lens material had both satisfied the image quality requirement of camera lens, had reduced the material price of lens again.
(6) The utility model discloses a with camera lens focal length assorted thin chenille lens, realized to the side telecentric light path for the illuminance on the screen is even, and the image size can not change during the focusing.
(7) The LCD projection lens of the utility model realizes reasonable balance of aberration, focal length, relative aperture, distortion and chromatic aberration; by changing the rear working distance, the requirements of projectors with direct projection or different configurations with reflecting mirrors can be met.
The utility model discloses a mixture of two kinds of lenses, the high advantage of existing glass lens transmissivity has the characteristics that the plastic lens is with low costs, production efficiency is high again, the utility model discloses the lens is small in quantity, and the cost is lower, and projection display image is even clear, and the quality is better, satisfies the demand of market to high image quality.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to these drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a hybrid LCD projection lens according to a first embodiment of the present invention.
Fig. 2 is a schematic diagram of a hybrid LCD projection lens according to a first embodiment of the present invention.
Fig. 3 is a schematic diagram illustrating a lens transfer function according to a first embodiment of the present invention.
Fig. 4 is a schematic diagram illustrating distortion of a hybrid LCD projection lens according to a first embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a second embodiment of a hybrid LCD projection lens according to the present invention.
Fig. 6 is a schematic diagram of a lens transfer function according to a second embodiment of the hybrid LCD projection lens of the present invention.
Fig. 7 is a schematic diagram illustrating lens distortion of a second embodiment of the hybrid LCD projection lens according to the present invention.
Fig. 8 is a schematic structural diagram of a third embodiment of a hybrid LCD projection lens according to the present invention.
Fig. 9 is a schematic diagram of lens transfer functions of a third embodiment of the hybrid LCD projection lens according to the present invention.
Fig. 10 is a schematic diagram illustrating lens distortion of a third embodiment of the hybrid LCD projection lens according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when used, it is only for convenience of description of the present invention and simplification of description, but not for indication or suggestion that the indicated device or element must have a specific direction, be constructed and operated in a specific direction, and therefore, the present invention should not be construed as being limited thereby. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not require that the components be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, "a plurality" means at least 2.
In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "set", "mounted", "connected" and "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Example one
With reference to fig. 1-4, the present embodiment discloses a hybrid LCD projection lens, which includes a first lens group 3, a second lens group 4 and a third lens 5 sequentially disposed from a screen end 1 to an LCD end 2;
the first lens group 3 comprises 1 plastic aspheric lens;
the second lens group 4 comprises 1 piece of spherical glass lens;
the third lens 5 is a thin Fresnel lens;
a diaphragm 6 is arranged between the first lens group 3 and the second lens group 4.
The spherical glass lens of the second lens group is at least one of the following three materials:
(1) H-LaK 7-7A, refractive index Nd-1.7300, and dispersion coefficient Vd-53.83;
(2) h to ZK11, refractive index Nd 1.63854, and dispersion coefficient Vd 55.45;
(3) h to ZF2, refractive index Nd 167270, and dispersion coefficient Vd 32.17.
When the LCD is smaller than 3 inches, the second lens group adopts a glass spherical lens with the refractive index Nd smaller than 1.64; when the LCD size is larger than 3 inches, the second lens group selects a spherical glass lens with a refractive index Nd smaller than 1.74.
The focal length value range of the thin Fresnel lens is 0.8 to 1 time of the focal length value of the lens.
When the number of the lenses of the first lens group and the second lens group is 2-3, the relative aperture range of the projection lens is below F2.4; when the number of the lenses of the first lens group and the second lens group is 4, the relative aperture range of the projection lens is below F2.3.
When the projection lens uses the reflector, the distance from the surface of the lens at the end, far away from the screen end, of the second lens group to the thin Fresnel lens is larger than 0.9 times of the size of the LCD; when the projection lens does not use a reflector, the distance from the surface of the lens at the end of the second lens group far away from the screen end to the thin Fresnel lens is less than 0.8 times of the size of the LCD.
The diameter range of the plastic aspheric lens is 20-75; the radius value range of the glass lens is-15 to-800 mm or 15 to 800 mm;
the weight of the wavelength range of the whole optical system of the projection lens is: r: 656.8nm, weight 80; g: 587.56nm, weight 100; b: 486.13nm weight 60.
The K value range of the plastic aspheric lens is-0.3 to-30 or 0.3 to 30; the order of the aspheric equation of the plastic lens is 6 to 12.
The surface type precision of the plastic aspheric lens is as follows: when the effective aperture of the plastic aspheric lens is less than 30, the surface form precision is less than 5 micrometers; when the effective aperture of the plastic aspheric lens is less than 45, the surface accuracy is less than 7 micrometers; when the effective aperture of the plastic aspheric lens is less than 60, the surface form precision is less than 10 microns; when the effective aperture of the plastic aspheric lens is larger than 60, the surface form precision is less than 12 microns.
The LCD projection lens that this embodiment demonstrates is a glass-plastic lens, and its main parameter: the LCD specification is 2.4 inches to 2.69 inches; a focal length of 75; the relative aperture is F2.38; the full-field discrimination rate is more than 2.43 lp/mm; the distortion is less than 0.2%.
Example two
The difference between the present embodiment and the first embodiment is as follows with reference to fig. 5-7: in this embodiment, the first lens group 3 includes 2 plastic aspheric lenses; the second lens group 4 comprises 1 piece of spherical glass lens;
the LCD camera lens that this embodiment demonstrates is a glass two and moulds the camera lens, and its main parameter is: the LCD specification is 2.4 inches to 2.69 inches; the focal length is 70; the relative aperture is F2.06; the full-field discrimination rate is more than 3.8 lp/mm; the distortion is less than 0.2%.
EXAMPLE III
The difference between the present embodiment and the first embodiment is as follows, with reference to fig. 8-10: in this embodiment, the first lens group 3 includes 2 plastic aspheric lenses; the second lens group 4 comprises 2 spherical glass lenses;
the LCD camera lens that this embodiment demonstrates is two glasses two and moulds the camera lens, and its major parameter is: the LCD specification is: 3.5-4.1 cun; a focal length of 100; relative pore size F2.27; the full-field discrimination rate is more than 3.33 lp/mm; distortion is less than 0.3%
The present invention and its embodiments have been described above, but the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should understand that they should not be limited to the embodiments described above, and that they can design the similar structure and embodiments without departing from the spirit of the invention.
Claims (9)
1. A mixed LCD projection lens is characterized in that a first lens group, a second lens group and a third lens are sequentially arranged from a screen end to an LCD end;
the first lens group comprises 1 or 2 or more than two plastic aspheric lenses;
the second lens group comprises 1 or 2 spherical glass lenses;
the third lens is a thin Fresnel lens;
a diaphragm is arranged between the first lens group and the second lens group;
when the total number of the lenses of the first lens group and the second lens group is 2-3 lenses, the relative aperture range of the projection lens is below F2.4; when the total number of the lenses of the first lens group and the second lens group is 4 lenses, the relative aperture range of the projection lens is below F2.3.
2. The hybrid LCD projection lens of claim 1 wherein the second set of spherical glass lenses is made of at least one of the following three materials:
(1) H-LaK 7A, refractive index Nd-1.7300, and dispersion coefficient Vd-53.83;
(2) h to ZK11, refractive index Nd 1.63854, and dispersion coefficient Vd 55.45;
(3) h to ZF2, refractive index Nd 167270, and dispersion coefficient Vd 32.17.
3. The hybrid LCD projection lens of claim 1 wherein said second lens group is selected from the group consisting of spherical glass lenses with refractive index Nd less than 1.64 when LCD size is less than 3 inches; when the LCD is larger than 3 inches, the second lens group adopts a spherical glass lens with the refractive index Nd smaller than 1.74.
4. A hybrid LCD projection lens as claimed in claim 1, wherein the thin fresnel lens has a focal length in the range of 0.8 to 1 times the focal length of the lens.
5. The hybrid LCD projection lens of claim 1 wherein when said projection lens uses a reflector, the distance from the surface of the lens at the end of said second lens group away from the screen end to the thin Fresnel lens is greater than 0.9 times the LCD size; when the projection lens does not use a reflector, the distance from the surface of the lens at one end of the second lens group far away from the screen end to the thin Fresnel lens is less than 0.8 times of the size of the LCD.
6. A hybrid LCD projection lens as claimed in claim 1, wherein the plastic aspheric lens has a diameter in the range of 20 to 75; the surface radius value range of the spherical glass lens is-15 to-800 mm or 15 to 800 mm.
7. A hybrid LCD projection lens as claimed in claim 1, wherein the projection lens wavelength ranges are weighted by: r: 656.8nm, weight 80; g: 587.56nm, weight 100; b: 486.13nm weight 60.
8. The hybrid LCD projection lens of claim 1, wherein the plastic aspheric lens has a K value in the range of-0.3 to-30 or 0.3 to 30; the order number of the aspheric surface equation of the plastic aspheric surface lens is 6 to 12.
9. A hybrid LCD projection lens as claimed in claim 1, wherein the plastic aspheric lens has a face shape precision of: when the effective aperture of the plastic aspheric lens is less than 30, the surface form precision is less than 5 microns; when the effective aperture of the plastic aspheric lens is less than 45, the surface type precision is less than 7 microns; when the effective aperture of the plastic aspheric lens is less than 60, the surface form precision is less than 10 microns; when the effective aperture of the plastic aspheric lens is larger than 60, the face shape precision is less than 12 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221634022.XU CN217521433U (en) | 2022-06-27 | 2022-06-27 | Mixed type LCD projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221634022.XU CN217521433U (en) | 2022-06-27 | 2022-06-27 | Mixed type LCD projection lens |
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| Publication Number | Publication Date |
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| CN217521433U true CN217521433U (en) | 2022-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221634022.XU Active CN217521433U (en) | 2022-06-27 | 2022-06-27 | Mixed type LCD projection lens |
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- 2022-06-27 CN CN202221634022.XU patent/CN217521433U/en active Active
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