CN116300292A

CN116300292A - Projection light path structure and projection advertising lamp

Info

Publication number: CN116300292A
Application number: CN202310321455.2A
Authority: CN
Inventors: 王振鹏; 胡洋
Original assignee: Guangzhou Xiaoying Imaging Technology Co ltd
Current assignee: Guangzhou Xiaoying Imaging Technology Co ltd
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-06-23

Abstract

The application relates to a projection light path structure and a projection advertisement lamp, comprising a lighting module, a refraction module and a reflection module which are sequentially arranged, wherein the lighting module comprises a light source, light source protection glass, a first lens with positive focal power, a second lens with positive focal power and a glass film which are sequentially arranged on an emission light path, and the light source is used for emitting image light beams; the refraction module comprises a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with positive focal power and a ninth lens with negative focal power, which are sequentially arranged on a refraction optical path, and the refraction module further comprises an aperture diaphragm, wherein the aperture diaphragm is arranged on the refraction optical path. The present application helps to improve the projection quality of projection lamps.

Description

Projection light path structure and projection advertising lamp

Technical Field

The application relates to the technical field of projection light path structures, in particular to a projection light path structure and a projection advertisement lamp.

Background

In recent years, with the development of projection technology, ultra-short focus has become a hotspot in the projector market by virtue of its ability to effectively shorten the projection distance and realize the projection of large-size pictures within a short distance.

At present, most of imaging modes in the projection lamp industry are direct projection, and the direct projection scheme has the problems of long projection distance, low definition, large distortion, installation problem, large projection ratio of a projected image surface, large distortion of the projected image surface, low imaging definition and the like.

Therefore, there is a need for a projection light path structure and a projection advertisement lamp.

Disclosure of Invention

The application provides a projection light path structure to the not good problem of projection lamp projection quality.

The application provides a projection light path structure and projection advertising lamp adopts following technical scheme:

in a first aspect, a projection light path structure includes an illumination module, a refraction module, and a reflection module sequentially arranged, where the refraction module is configured to refract an image beam entering the refraction module into the reflection module; the reflection module is used for reflecting and imaging the image beam entering the reflection module to the external projection screen;

the illumination module comprises a light source, light source protection glass, a first lens with positive focal power, a second lens with positive focal power and a glass film which are sequentially arranged on an emission light path, wherein the light source is used for emitting image light beams;

the refraction module comprises a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with positive focal power and a ninth lens with negative focal power which are sequentially arranged on a refraction optical path, and an aperture diaphragm which is arranged on the refraction optical path;

the glass film (15) is arranged between the second lens (14) and the third lens (21), so that the refraction module (2) and the reflection module (3) are matched to form an imaging surface, and the imaging surface is formed by pattern projection of the glass film (15).

Through adopting above-mentioned technical scheme, set up glass film between second lens and third lens, with the pattern on the glass film is statically projected through refracting module and reflecting module to the light that makes the light source transmit, with this static projection, can realize imaging in not having ray apparatus module yet, the customer can make the glass film that has different patterns according to own demand and reach different display effect simultaneously, and through improving lens focal length ratio in this light path structure, and according to the material of every lens, the lens in illuminating module and the refracting module is arranged in order and is combined, with this imaging quality that promotes projection light path structure, and effectively reduce the distortion, simultaneously lens adopts glass or resin material, and replace traditional DMD chip with glass film, with the bulk cost of reduction projection light path structure, and promote the stability under the product again high temperature, various electronic components unstable factors have been reduced promptly, prolonged the life-span in this projection light path again high temperature environment.

Optionally, the reflecting module is a concave reflecting mirror, and the concave reflecting mirror is an aspheric reflecting mirror or a free-form reflecting mirror.

By adopting the technical scheme, the reflection system adopts the aspheric mirror or the free-form surface mirror, so that light rays can be effectively compressed, astigmatism and distortion can be corrected, and the projection ratio of the light path structure can be improved.

Optionally, the first lens is a glass plano-convex lens, and the second lens is any one of a plastic aspherical lens, a glass aspherical lens and a spherical lens.

Through adopting above-mentioned technical scheme, the second lens is any one of plastics aspheric lens, glass aspheric lens and spherical lens, has all promoted the luminous flux of light source, makes light source center and marginal illuminance more even to restrict the luminous angle of light source from 120 to 10, thereby promote projection luminance.

Optionally, a side of the first lens, which is close to the light source, is a plane, and a side of the first lens, which is away from the light source, is a convex surface; both sides of the second lens are convex.

Optionally, the second lens is characterized by the following formula:

wherein z is the sagittal height, c is the curvature at the apex of the surface, r is the radial coordinate, k is the quadric coefficient, a ₄ 、a ₆ 、a ₈ 、a ₁₀ 、a ₁₂ A) ₁₄ The high order term coefficients, which are even aspheric.

Optionally, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are all optical spherical lenses, and the aperture stop is located between the fifth lens and the sixth lens.

By adopting the technical scheme, the chromatic aberration of the projection light path structure can be better corrected through a plurality of spherical lenses which are sequentially arranged, the refraction and diffraction mixed system structure which combines the diffraction optical element and the refraction optical element is adopted, the refraction and diffraction mixed system structure has good optical imaging characteristics, and the high imaging quality of the projection lamp is ensured under the condition that the refraction group does not adopt an aspheric surface.

Optionally, both sides of the third lens are convex; both sides of the fourth lens are convex; both sides of the fifth lens are concave surfaces; one side of the sixth lens, which is close to the light source, is a concave surface, and one side of the sixth lens, which is away from the light source, is a convex surface; both sides of the seventh lens are convex; one side of the eighth lens, which is close to the light source, is a convex surface, and one side of the eighth lens, which is away from the light source, is a concave surface; both sides of the ninth lens are concave surfaces.

By adopting the technical scheme, the R value, the thickness, the air gap and the material of the lens are set as variables on ZEMAX optical design software, design optimization is carried out through constraint commands, and a relatively good value is found in a least damping square method so as to optimize the optical distortion and imaging definition of the refraction module.

Optionally, the fourth lens and the fifth lens form a cemented lens, and the cemented lens has negative optical power.

By adopting the technical scheme, the fourth lens and the fifth lens form the cemented lens, so that system chromatic aberration can be effectively eliminated, and the assembly is facilitated.

Optionally, the projection ratio of the projection light path structure is 0.37.

Through adopting above-mentioned technical scheme, the projection ratio of projection light path structure is 0.37, satisfies the user demand of ultrashort burnt, shortens the distance between projecting apparatus and the projection screen greatly, can realize 50 inches of image display when shortening projection distance.

In a second aspect, a projection advertising lamp includes a housing and a projection light path structure as defined in any one of the preceding claims, the projection light path structure being disposed within the housing.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the glass film is arranged between the second lens and the third lens, so that the light emitted by the light source is statically projected out of the patterns on the glass film through the refraction module and the reflection module, static projection is realized, imaging can be realized without an optical machine module, in the optical path structure, the lenses in the illumination module and the refraction module are orderly arranged and combined according to the material of each lens, the imaging quality of the projection optical path structure is improved, distortion is effectively reduced, meanwhile, the lenses are made of glass or resin materials, the traditional DMD chip is replaced by the glass film, the overall cost of the projection optical path structure is reduced, the stability of products at a high temperature is improved, namely, unstable factors of various electronic components are reduced, the service life of the projection optical path in a high-temperature environment is prolonged, different display contents are replaced by using the glass film, the requirement of customers on static advertising contents is met, and the cost of using the glass film is reduced by 90% compared with that of a DMD and DLP technology.

2. The projection lens has compact overall architecture, and the large-field aberration is corrected by arranging the aperture diaphragm, the aspheric lens and the aspheric mirror or the free-form surface mirror, so that the resolving power of the projection lens is improved, and high-quality image display is realized.

Drawings

FIG. 1 is a schematic diagram of a projection optical path structure provided herein;

fig. 2 is a light path diagram of projection light emitted by the projection light path structure and projected onto a screen according to an embodiment of the present application;

FIG. 3 is a graph showing the modulation transfer function of the projected optical path structure provided in an embodiment of the present application;

fig. 4 is a light ray phase difference diagram of a projection light path structure provided in an embodiment of the present application;

FIG. 5 is an interface form diagram of a vertical axis color difference diagram of a projection light path structure provided in an embodiment of the present application;

FIG. 6 is an RMS diagram of a projected optical path structure provided by an embodiment of the present application;

fig. 7 is a diagram of the relative illuminance of the projection light path structure according to the embodiment of the present application.

Reference numerals illustrate: 1. a lighting module; 11. a light source; 12. light source protection glass; 13. a first lens; 14. a second lens; 15. a glass film; 2. a refraction module; 21. a third lens; 22. a fourth lens; 23. a fifth lens; 24. an aperture stop; 25. a sixth lens; 26. a seventh lens; 27. an eighth lens; 28. a ninth lens; 3. a reflection module; 31. a concave mirror; 32. and (3) protecting glass.

Detailed Description

A further detailed description of a projection light path structure is provided herein below with reference to fig. 1-7.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.

Referring to fig. 1 and 2, an embodiment of the present application discloses a projection light path structure, which includes an illumination module 1, a refraction module 2 and a reflection module 3 arranged in sequence, wherein the refraction module 2 is used for refracting an image beam entering the refraction module 2 into the reflection module 3, and the reflection module 3 is used for reflecting and imaging the image beam entering the reflection module 3 to an external projection screen.

The lighting module 1 comprises a light source 11, a light source protection glass 12, a first lens 13 with positive focal power, a second lens 14 with positive focal power and a glass film 15, which are sequentially arranged on an emitting light path, wherein the light source 11 is used for emitting an image light beam, and the light source 11 can be an LED lamp bead or a laser light source.

The glass film 15 is formed by combining three glass lenses with three surfaces respectively coated with red, green and blue wavelength dielectric films, each glass lens is subjected to color stripping by using a laser printer, and the glass film 15 adopts H-K9L type optical glass. The CMY subtractive color mixing mode film is formed by laser color stripping, and the color yellowing and oxidization of the projection image can not be caused under a long-term high-temperature environment.

The glass film 15 is disposed between the second lens 14 and the third lens 21, so that the refraction module 2 and the reflection module 3 cooperate to form an image plane, wherein the image plane is formed by pattern projection of the glass film 15.

In this embodiment, the first lens 13 is a plano-convex lens, one side of the first lens 13 close to the light source 11 is a plane, one side of the first lens 13 away from the light source 11 is a convex surface, the optical focal length of the first lens 13 is 11.018mm, and the material of the first lens 13 is an optical glass of the type H-ZLAF 55D; the second lens 14 is an aspherical lens, both sides of the second lens 14 are convex, the optical focal length of the second lens 14 is 14.105mm, and the second lens 14 can be a double-sided aspherical processing injection molding lens or a glass lens. The second lens 14 is provided with an aspherical lens to concentrate the divergent light source, thereby restricting the light emitting angle of the light source 11, increasing the luminous flux and the uniformity of the brightness of the outgoing light of the light source 11.

The design parameters of the aspheric lens are characterized using the following formula:

wherein z is the sagittal height, c is the curvature at the apex of the surface, r is the radial coordinate, k is the quadric coefficient, a ₄ 、a ₆ 、a ₈ 、a ₁₀ 、a ₁₂ A) ₁₄ The high order term coefficients, which are even aspheric. In the aspherical data, E-n represents ". Times.10" ^-n ", e.g. 8.00423E-06, represents 8.00423X 10 ^-6 . The aspherical parameters are shown in table 1.

Table 1: aspherical lens design parameter table

Lens radius R	56.51925CX	-9.134388cx
			Quadric constant K	32.03165	-1.0102
4 th order coefficient a4	0.0012083457	-0.00011171455
			Coefficient of order 6 a6	6.4246766e-07	7.6241346e-07
Coefficient of 8 th order a8	-7.5207451e-09	2.993681e-08
			Coefficient of order 10 a10	0	0
12 th order coefficient a12	0	0
			14 th order coefficient a14	0	0

The projection light beam emitted by the LED lamp beads passes through the aspheric lens, so that the light-gathering brightness of the LED lamp beads is effectively increased, the LED light emission angle is adjusted by 120 degrees to form 10 degrees, the refraction angle of light is reduced, the projection light beam irradiates the glass film 15 by utilizing optical energy, and the projection brightness of the glass film 15 is increased.

The refraction module 2 includes a third lens 21, a fourth lens 22, a sixth lens 25, a seventh lens 26, and an eighth lens 27 having positive power, a fifth lens 23 and a ninth lens 28 having negative power, which are sequentially disposed on a refraction optical path, and the refraction module 2 further includes an aperture stop 24, between the aperture stop 24, the fifth lens 23 and the sixth lens 25.

In the present embodiment, the third lens 21 is a lenticular lens, the optical focal length of the third lens 21 is 29.542mm, and the third lens 21 material is an optical glass of the H-ZLAF50A type; the fourth lens 22 is a biconvex lens, the optical focal length of the fourth lens 22 is 23.147mm, and the fourth lens 22 material is H-QK3L type optical glass; the fifth lens 23 is a biconcave meniscus lens, both sides of the fifth lens 23 are concave surfaces, the optical focal length of the fifth lens 23 is-13.592 mm, and the material of the fifth lens 23 is H-ZF52 type optical glass; the sixth lens 25 is a meniscus lens, the optical focal length of the sixth lens 25 is 41.004mm, and the sixth lens 25 material is an optical glass of H-ZBAF20 type; the seventh lens 26 is a meniscus lens, both sides of the seventh lens 26 are convex, the optical focal length of the seventh lens 26 is 53.927mm, and the seventh lens 26 is made of H-LAF50B type optical glass; the eighth lens 27 is a biconvex lens, the optical focal length of the eighth lens 27 is 53.69mm, and the eighth lens 27 material is H-ZF4A type optical glass; the ninth lens 28 is a biconcave lens, the optical focal length of the ninth lens 28 is-25.147 mm, and the ninth lens 28 material is an optical glass of the H-ZF4A type.

The fourth lens 22 and the fifth lens 23 form a cemented lens, the fourth lens 22 is a positive lens, the fifth lens 23 is a negative lens, the optical focal length of the cemented lens is-49.93 mm, the negative lens in the cemented lens in the refraction module 2 is close to the diaphragm, the positive lens in the cemented lens is a material with a low refractive index (Nd less than or equal to 1.5) and a high abbe number (Vd less than or equal to 65), and the negative lens is a material with a high refractive index (Nd less than or equal to 1.8) and a low abbe number (Vd less than or equal to 25).

The reflection module 3 includes a concave mirror 31 and a cover glass 32, and the concave mirror 31 is an aspherical mirror or a free-form surface mirror. The free-form surface reflector is formed by injection molding, and a silver or nickel reflecting film is plated on the surface of the free-form surface reflector to increase the reflectivity of the free-form surface reflector and correct distortion and chromatic aberration.

In this embodiment, the coordinates of the free-form surface mirror need to translate 81.074722 along the Y-axis and rotate 19.126597 ° around the X-axis, and a rectangular effective size of 82mm X68 mm is taken with (0,61) as the coordinate center, so as to form the free-form surface mirror.

The design parameters of the free-form surface reflector are characterized by adopting the following formulas:

wherein z is the sagittal height, c is the curvature at the surface vertex, r is the radial coordinate, k is the quadric coefficient, N is the total number of polynomial coefficients in the series, A _i The coefficients of the polynomial are extended for the i-th term. The polynomial is simply a power series in the x, y direction. For example, the first term of the polynomial is x, then y, followed by x, x y, y, etc. There are 2 terms for the 1-degree term, 3 terms for the 2-degree term, 4 terms for the 3-degree term, and so on. The highest degree is 20, so that the maximum of the total number of polynomial aspheric coefficients is 230. The data values of the x, y and other positions are divided by a normalized radius to obtain a polynomial coefficient without dimension. For example, item 12, additional data item 14, in the polynomial, is x ² y ² Coefficients of the term. The coefficients Ai are each in lens units, e.g., millimeters, inches. In the freeform mirror data, X4Y0 represents X ⁴ Y ⁰ . The freeform mirror design parameters are shown in table 2.

The R value, thickness, air gap and material of the lens are set as variables on ZEMAX optical design software, design optimization is carried out through constraint commands, a relatively good value is found in a least damping square method, the design parameters are changed to be only the better case in the relatively good values, and the rest design values are also in a protection range.

And (II) table: free-form surface reflector design parameter table

The projection ratio of the projection light path structure is 0.37, the use requirement of ultra-short focus is met, the distance between the projector and the projection screen is greatly shortened, and the image display with the projection distance being more than 50 inches can be realized.

The modulation transfer function (Modulation Transfer Function, MTF) of the projected optical path structure is shown in fig. 3, where the abscissa represents spatial frequency and the ordinate represents modulation transfer function ratio. As can be seen from fig. 3, at the nyquist frequency, the modulation transfer function ratio can be still greater than 50%, and the modulation transfer function ratio has no significant degradation, which means that each pixel can be clearly analyzed, and good image quality is obtained.

Fig. 4 shows aberration values of five wavelengths (0.435 um, 0.486um, 0.55um, 0.587um, 0.66 um) with the dominant wavelength light in x-axis and y-axis, respectively, under normalized respective field conditions. The 12 graphs thereof represent normalized 12 fields of view, respectively; the two charts in each view field are respectively an x axis and a y axis which are symmetrical by taking the optical axis as a center in the projection system; the horizontal axis direction in each graph is the pupil height position under the field of view condition, and the vertical axis direction is the error between the light rays of the respective wavelengths and the principal ray.

Fig. 5 is an interface form diagram of a vertical axis color difference diagram of the present application, where vertical axis color difference describes the difference between the principal rays of different light waves at each view field position in the height direction at the image plane, and the vertical axis is the object height view field value, and the horizontal axis is the numerical value, and the unit is micrometers. In the figure, the dominant wavelength is used as a reference, and the color difference value of each view field among blue light, red light and green light (dominant wavelength) is respectively drawn. As can be seen from the graph, the sum of absolute values of the transverse axes at the maximum of the two curves is less than 833×0.5, and the graph has the characteristic of low transverse chromatic aberration.

Fig. 6 is an RMS diagram of a projection light path structure of the present application, which shows spot points of light spots on an imaging screen under different view field conditions, and is shown as spot imaging diagrams of five different wavelength light rays (0.435 um, 0.486um, 0.55um, 0.587um, 0.66 um) on a screen under a certain view field condition on the premise of normalizing different view field conditions.

Fig. 7 shows a relative illuminance curve of the projection optical path structure in this embodiment, which represents the relative illuminance values of different view angles on the imaging plane, the horizontal axis represents the view (unit: mm), and the vertical axis represents the relative illuminance (unit:%). As can be seen from the figure, the relative illuminance value of the optical lens is greater than 80% when the field of view is between 1.8 mm and 8.4mm, which indicates that the optical lens has excellent relative illuminance as shown in fig. 1, and the embodiment of the application further provides a projection advertisement lamp (not shown) which includes a housing (not shown) and a projection optical structure, wherein the projection optical structure is disposed in the housing, and the housing is used for fixing the projection optical structure.

The projection advertisement lamp provided by the embodiment greatly simplifies the lens structure by using the matching of one aspheric lens and eight spherical lenses, reduces the volume of the lens, reduces the production cost, simultaneously realizes the image quality complementation at different temperatures, selects and configures each group of lenses to improve the focal length ratio of the lenses, and orderly arranges and combines the lenses in the illumination module 1 and the refraction module 2 according to the material of each lens, thereby improving the imaging quality of the projection light path structure, effectively reducing distortion, simultaneously adopting glass or resin material for the lenses, replacing the traditional DMD chip with the glass film 15, reducing the overall cost of the projection light path structure, improving the stability of the product at a high temperature, namely reducing the unstable factors of various electronic components, and prolonging the service life of the projection light path in a high-temperature environment. The projection lens has compact overall architecture, and the aspheric lens and the aspheric mirror or the free-form surface mirror correct the large-field aberration, so that the brightness and the resolving power of the projection lens are improved, and high-quality image display is realized.

The embodiments of the present invention are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. The projection light path structure is characterized by comprising an illumination module (1), a refraction module (2) and a reflection module (3) which are sequentially arranged, wherein the refraction module (2) is used for refracting an image light beam entering the refraction module (2) into the reflection module (3); the reflection module (3) is used for reflecting and imaging the image light beam entering the reflection module (3) to the external projection screen;

the illumination module (1) comprises a light source (11), a light source protection glass (12), a first lens (13) with positive focal power, a second lens (14) with positive focal power and a glass film (15) which are sequentially arranged on an emitting light path, wherein the light source (11) is used for emitting image light beams;

the refraction module (2) comprises a third lens (21) with positive focal power, a fourth lens (22) with positive focal power, a fifth lens (23) with negative focal power, a sixth lens (25) with positive focal power, a seventh lens (26) with positive focal power, an eighth lens (27) with positive focal power and a ninth lens (28) with negative focal power which are sequentially arranged on a refraction optical path, the refraction module (2) further comprises an aperture diaphragm (24), and the aperture diaphragm (24) is arranged on the refraction optical path;

2. The projection light path structure according to claim 1, characterized in that the reflection module (3) comprises a concave mirror (31), the concave mirror (31) being an aspherical mirror or a free-form surface mirror.

3. The projection light path structure according to claim 1, wherein the first lens (13) is a glass plano-convex lens, and the second lens is any one of a plastic aspherical lens, a glass aspherical lens, or a spherical lens.

4. A projection light path structure according to claim 3, characterized in that the side of the first lens (13) close to the light source (11) is a plane, the side of the first lens (13) facing away from the light source (11) is a convex surface; both sides of the second lens (14) are convex.

5. The projected light path structure according to claim 1, characterized in that the second lens (14) is characterized by the following formula:

6. The projection optical path structure according to claim 1, wherein the third lens (21), the fourth lens (22), the fifth lens (23), the sixth lens (25), the seventh lens (26), the eighth lens (27) and the ninth lens (28) are all optical spherical lenses, and the aperture stop (24) is located between the fifth lens (23) and the sixth lens (25).

7. The projection light path structure according to claim 1, wherein both sides of the third lens (21) are convex; both sides of the fourth lens (22) are convex; both sides of the fifth lens (23) are concave surfaces; the side of the sixth lens (25) close to the light source (11) is a concave surface, and the side of the sixth lens (25) away from the light source (11) is a convex surface; both sides of the seventh lens (26) are convex; one side of the eighth lens (27) close to the light source (11) is a convex surface, and one side of the eighth lens (27) away from the light source (11) is a concave surface; both sides of the ninth lens (28) are concave surfaces.

8. The projection light path structure according to claim 1, characterized in that the fourth lens (22) and the fifth lens (23) constitute a cemented lens having negative optical power.

9. The projection light path structure of claim 1, wherein: the projection ratio of the projection light path structure is 0.37.

10. A projection advertising lamp comprising a housing and a projection light path structure as claimed in any one of claims 1 to 9, said projection light path structure being disposed within said housing.