Uniform lighting device for compensating relative illumination loss of lens

Abstract

The utility model discloses a uniform lighting device for compensating relative illumination loss of a lens, which comprises a light source, a light distribution lens, an LCD screen, a front Fresnel lens, a rear Fresnel lens and a projection lens, and is characterized in that the light source is used for providing illumination, the light distribution lens is used for adjusting the distribution of illumination energy, the front Fresnel lens is arranged between the light distribution lens and the LCD screen, and the rear Fresnel lens is arranged between the front Fresnel lens and the LCD screen. The front Fresnel lens is arranged between the LCD screen and the projection lens, the rear Fresnel lens is arranged between the LCD screen and the projection lens, and light generated by the light source is adjusted through the light distribution lens and then sequentially passes through the rear Fresnel lens, the LCD screen and the front Fresnel lens to project an image through the projection lens; a concave surface structure is formed on the side, back on to the light source, of the light distribution lens, and the thickness of the light distribution lens is gradually decreased from the edge to the central area, so that the energy intensity of illumination penetrating through the light distribution lens is gradually increased from the center to the edge.

Description

Technical Field

[0001] The utility model relates to the field of optical equipment, in particular to a uniform lighting device for compensating the relative illumination loss of a lens. Background Art

[0002] Among the LCD projection lighting solutions, one type of solution is the most common solution of directly adding a light source to a light bucket or adding a collimating shaping lens group. This type of solution is simple and low-cost, but there is a problem of poor brightness uniformity of the projected image; another type of solution is to use an array light source plus an array light bucket or an array lens module to achieve the purpose of edge and middle balance, and divide the entire screen into different sub-areas, and achieve uniform illumination on the screen through an array to achieve better uniformity. However, due to the splicing problem between the sub-areas, this solution either has a gap in the middle and cannot be fully covered, or there is interference and overlap between them, resulting in bright bars, or the light source is directly imaged, and there are bright spots like cannon barrels in the middle of the picture. If these adverse effects are to be eliminated, other optical devices need to be added, such as compound eyes and integral lenses, which make the structure more complicated. Therefore, a uniform lighting device that can improve the uniformity of lighting and does not require a complex structure to compensate for the relative illumination loss of the lens is needed. Utility Model Content

[0003] The main purpose of the present application is to provide a uniform lighting device that compensates for the relative illumination loss of a lens, aiming to solve the problems mentioned in the background technology.

[0004] The present application provides a uniform lighting device for compensating for the relative illumination loss of a lens, characterized in that it comprises a light source, a light distribution lens, an LCD screen, a front Fresnel mirror, a rear Fresnel mirror and a projection lens, wherein the light source is used to provide illumination, the light distribution lens is used to adjust the distribution of illumination energy, the front Fresnel mirror is arranged between the light distribution lens and the LCD screen, the rear Fresnel mirror is arranged between the LCD screen and the projection lens, and the illumination generated by the light source is first adjusted by the light distribution lens, and then sequentially passes through the rear Fresnel mirror, the LCD screen, and the front Fresnel mirror, and then projects an image through the projection lens;

[0005] A concave structure is formed on the side of the light distribution lens facing away from the light source, and the thickness of the light distribution lens gradually decreases from the edge toward the central area, so that the intensity of light energy passing through the light distribution lens increases from the center to the edge.

[0006] Furthermore, a side of the light distribution lens facing the light source is a planar structure.

[0007] Furthermore, a side of the light distribution lens facing the light source is recessed to form a groove portion, and the light source is installed in the groove portion.

[0008] Furthermore, a side of the light distribution lens facing the light source is a curved structure.

[0009] Furthermore, the concave surface structure is an arc-shaped concave surface.

[0010] Furthermore, the light distribution lens is arched outward around the edge of the concave structure to form an arc-shaped convex portion.

[0011] Furthermore, it also includes heat-insulating glass, which is arranged between the LCD screen and the rear Fresnel mirror.

[0012] Furthermore, it also includes a light bucket, the light source and the light distribution lens are arranged in the light bucket, the light bucket is used to limit the illumination area of ​​the light, and cooperate with the light distribution lens to adjust the illumination distribution of the light energy on the screen.

[0013] Furthermore, the rear Fresnel mirror is directly opposite to the opening of the light bucket, and the diameter of the rear Fresnel mirror is smaller than or equal to the diameter of the light bucket.

[0014] The utility model adjusts the distribution of illumination energy through a light distribution lens, distributes the energy of the central area to the edge area according to a certain proportion, so that the illuminated edge on the LCD screen is brighter than the center, and utilizes the concept of relative illumination of the projection lens itself, that is, when the brightness of the original image is completely uniform, the edge energy of the picture projected by the projection lens is weaker than the center energy, and the closer to the edge, the more it attenuates; the illumination edge has stronger energy than the center energy, and the lens edge has weaker energy than the center energy, and the positive and negative phases cancel each other out, and finally a projection picture with good uniformity is obtained in the projection picture; and compared with the existing technical solutions, the utility model, on the one hand, does not need to set up a complex mechanism to achieve the uniformity of the projection picture, and on the other hand, it also avoids the splicing gaps and overlaps between the sub-units of the array solution or the barrel phenomenon when the light source is directly imaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 It is a structural schematic diagram of a uniform lighting device for compensating for relative illumination loss of a lens according to an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 A magnified view of the area circled in the middle.

[0019] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the technical scheme in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0021] See also Figure 1-2 The present application provides a uniform lighting device 100 for compensating for the relative illumination loss of a lens, characterized in that it comprises a light source 10, a light distribution lens 20, a light bucket 30, an LCD screen 40, a heat-insulating glass 50, a front Fresnel mirror 70, a rear Fresnel mirror 60 and a projection lens 80, wherein the light source 10 is used to provide illumination, the light distribution lens 20 is used to adjust the distribution of illumination energy, the light source 10 and the light distribution lens 20 are arranged in the light bucket 30, the light bucket 30 is used to limit the illumination area of ​​illumination and cooperate with the light distribution lens to adjust the illumination distribution of light energy on the screen, and the front Fresnel mirror 70 is arranged between the light distribution lens 20 and the LCD screen 40, The rear Fresnel mirror 60 is arranged between the LCD screen 40 and the projection lens 80, and the heat-insulating glass 50 is arranged between the LCD screen 40 and the rear Fresnel mirror 60. The light generated by the light source 10 is first adjusted by the light distribution lens 20, and then passes through the rear Fresnel mirror 60, the LCD screen 40, and the front Fresnel mirror 70 in sequence before projecting the image through the projection lens 80; a concave structure 21 is formed on the side of the light distribution lens 20 facing away from the light source 10, and the thickness of the light distribution lens 20 gradually decreases from the edge to the center area, so that the light energy intensity passing through the light distribution lens 20 increases from the center to the edge.

[0022] The utility model adjusts the distribution of illumination energy through the light distribution lens 20, distributes the energy of the central area to the edge area according to a certain proportion, so that the illuminated edge on the LCD screen 40 is brighter than the center, and utilizes the concept of relative illumination of the projection lens 80 itself, that is, when the brightness of the original image is completely uniform, the edge energy of the image projected by the projection lens 80 is weaker than the center energy, and the closer to the edge, the more it attenuates; the illumination edge has stronger energy than the center energy, and the lens edge has weaker energy than the center energy, and the positive and negative phases cancel each other out, and finally a projection image with good uniformity is obtained in the projection image; and compared with the existing technical solutions, the utility model, on the one hand, does not need to set up a complex mechanism to achieve the uniformity of the projection image, and on the other hand, it also avoids the splicing gaps and overlaps between the sub-units of the array solution or the barrel phenomenon when the light source 10 is directly imaged.

[0023] In an implementation manner of the present invention, a side of the light distribution lens 20 facing the light source 10 is a planar structure.

[0024] Preferably, the light distribution lens 20 is recessed on one side facing the light source 10 to form a groove portion 23, and the light source 10 is installed in the groove portion 23; in this embodiment, the light source 10 is arranged in the groove portion 23 to reduce the waste of light energy and improve the light efficiency.

[0025] In another embodiment of the present invention, the side of the light distribution lens facing the light source may also be a curved structure.

[0026] In one implementation of the utility model, the concave structure 21 is an arc-shaped concave surface; in this embodiment, the arc-shaped concave structure is used to make the energy of the light after passing through the light distribution lens 20 projected on the LCD screen 40 increase smoothly from the central area to the edge area at a certain ratio.

[0027] In an implementation manner of the present invention, the light distribution lens 20 is arched outward around the edge of the concave structure 21 to form an arc-shaped protrusion 22 .

[0028] In an implementation manner of the present invention, the rear Fresnel mirror 60 is directly opposite to the opening of the light bucket 30 , and the diameter of the rear Fresnel mirror 60 is smaller than or equal to the diameter of the light bucket 30 .

[0029] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A uniform lighting device for compensating for relative illumination loss of a lens, characterized in that: It comprises a light source, a light distribution lens, an LCD screen, a front Fresnel mirror, a rear Fresnel mirror and a projection lens, wherein the light source is used to provide illumination, the light distribution lens is used to adjust the distribution of illumination energy, the front Fresnel mirror is arranged between the light distribution lens and the LCD screen, the rear Fresnel mirror is arranged between the LCD screen and the projection lens, and the illumination generated by the light source is first adjusted by the light distribution lens, and then sequentially passes through the rear Fresnel mirror, the LCD screen and the front Fresnel mirror, and then projects an image through the projection lens; A concave structure is formed on the side of the light distribution lens facing away from the light source, and the thickness of the light distribution lens gradually decreases from the edge toward the central area, so that the intensity of light energy passing through the light distribution lens increases from the center to the edge.

2. The uniform lighting device for compensating the relative illumination loss of a lens according to claim 1, characterized in that: The side of the light distribution lens facing the light source is a planar structure.

3. The uniform lighting device for compensating the relative illumination loss of a lens according to claim 2, characterized in that: A groove portion is formed on a side of the light distribution lens facing the light source, and the light source is installed in the groove portion.

4. The uniform lighting device for compensating the relative illumination loss of a lens according to claim 1, characterized in that: The side of the light distribution lens facing the light source is a curved surface structure.

5. The uniform lighting device for compensating the relative illumination loss of a lens according to claim 1, characterized in that: The concave surface structure is an arc-shaped concave surface.

6. The uniform lighting device for compensating the relative illumination loss of a lens according to claim 1, characterized in that: The light distribution lens is arched outward around the edge of the concave structure to form an arc-shaped convex portion.

7. The uniform lighting device for compensating the relative illumination loss of a lens according to claim 1, characterized in that: It also includes heat-insulating glass, which is arranged between the LCD screen and the rear Fresnel mirror.

8. The uniform lighting device for compensating relative illumination loss of a lens according to claim 1, characterized in that: It also includes a light box, in which the light source and the light distribution lens are arranged. The light box is used to limit the illumination area of ​​the light and cooperate with the light distribution lens to adjust the illumination distribution of the light energy on the screen.

9. The uniform lighting device for compensating the relative illumination loss of a lens according to claim 8, characterized in that: The rear Fresnel mirror is directly opposite to the opening of the light bucket, and the diameter of the rear Fresnel mirror is smaller than or equal to the diameter of the light bucket.

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