Parallel light source and projector

Abstract

The utility model relates to a parallel light source and a projector, comprising an LED array which is arranged on a plane in a matrix; a light shield is arranged at a first distance in front of the LED array, and the light shield comprises a plurality of parallel light channels; and a lens array is arranged at the tail end of the light shield. Every two adjacent light channels of the light shield are separated by a flat plate material with a preset thickness. The surface of the inner wall of the light channel is a non-reflecting layer or is painted to be black. According to the parallel light source, the size of the light source can be reduced, generated parallel light is high in uniformity, and the parallel light source can be used for projection equipment.

Description

Technical Field

[0001] This utility model relates to the field of lighting sources, and in particular to a parallel light source and a projector. Background Technology

[0002] With the development of projection technology, projectors are becoming more and more common in daily life. Existing home projectors are often large and inconvenient to carry, requiring them to be placed in a laptop bag or a larger box. Therefore, it is necessary to optimize their size to make them smaller and more portable. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model proposes a parallel light source and a projector, comprising:

[0004] LED arrays, the LED arrays being arranged in a matrix on a plane;

[0005] A light shield is provided at a first distance in front of the LED array, and the light shield includes multiple parallel light channels.

[0006] The end of the light shield is provided with a lens array.

[0007] Furthermore, the light shield includes multiple parallel light channels, each with a rectangular, square, circular, or elliptical cross-section.

[0008] Furthermore, the light shield is separated between two adjacent light channels by a flat plate material of a predetermined thickness.

[0009] Furthermore, the inner wall surface of the light channel is a light-absorbing surface or a black surface.

[0010] Furthermore, a light shield is provided at a first distance in front of the LED array, wherein the first distance between the LED array and the first end face of the light shield is 0-20mm.

[0011] Furthermore, each light channel of the light shield corresponds to one LED bead in the LED array.

[0012] Furthermore, the length of the sunshade is 1-50mm.

[0013] Furthermore, each lens in the lens array corresponds to one optical channel.

[0014] Furthermore, the first surface of the lens is a plane, the second surface is a curved surface, and the lens array is an integral structure.

[0015] Furthermore, a projector equipped with the aforementioned parallel light source is proposed.

[0016] Beneficial effects

[0017] The parallel light source and projector of this invention are very compact in size and have a shorter length in the direction of light propagation, thus saving installation space. Moreover, the light has good parallelism and high uniformity, meeting the requirements of projection light source. Attached Figure Description

[0018] Figure 1 : Overall schematic diagram of the parallel light source of this utility model;

[0019] Figure 2 : Schematic diagram showing the alignment of the light shield with the array light source;

[0020] Figure 3 Schematic diagram of an array lens;

[0021] Figure 4 Side view of a parallel light source;

[0022] Figure 5 Schematic diagram of array light source;

[0023] Figure 6 : Schematic diagram of a sunshade;

[0024] Figure 7 Schematic diagram of lens array;

[0025] Figure 8 Schematic diagram of a single lens under magnification;

[0026] Figure 9 : A cross-sectional view of a single lens;

[0027] Figure 10 Uniformity simulation results. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0029] According to one embodiment, a parallel light source and a projector are proposed, such as... Figure 1-6 As shown, it includes:

[0030] LED array 1, wherein the LED beads in LED array 1 are arranged in a matrix on a plane; the aforementioned LED array can be a lamp board used in projectors, such as a 3-inch, 4-inch, 5-inch, or larger lamp board. Each LED bead can emit light, with a light emission angle of approximately 90–150 degrees. Figure 5 As shown, the LEDs are arranged in a matrix, including multiple rows and columns.

[0031] A light shield is provided at a first distance in front of the LED array, and the light shield includes multiple parallel light channels;

[0032] The end of the light shield is provided with a lens array.

[0033] Furthermore, the light shield includes multiple parallel light channels, each with a rectangular, square, circular, or elliptical cross-section. For example... Figure 2 The diagram shows the cross-sectional shape of the multiple light-transmitting holes in the light shield. Each light channel of each light shield corresponds to one LED bead in the LED array. Therefore, the light emitted by each individual LED bead is transmitted through a separate light channel.

[0034] Furthermore, the light shield is separated from adjacent light channels by a flat plate material of a predetermined thickness. In this embodiment, the light shield can be made of stainless steel or aluminum alloy flat material, and the thickness of the material is between 0.1 and 2 mm.

[0035] Furthermore, the inner wall surface of the light channel is a light-absorbing surface, such as a frosted surface or a non-reflective layer (i.e., absorbing light), or coated with black to reduce light reflection. This ensures that light entering the light channel will not be reflected on the inner wall, eliminating stray light.

[0036] Furthermore, in this embodiment, as Figure 4 As shown, in order to enable ventilation and heat dissipation, so that the heat on the surface of the array LED can be dissipated more quickly, the light shield is set at a distance of 0-20mm from the first end face of the LED array, preferably 5mm, so that there are ventilation gaps between the surface of the array LED and the light shield, which facilitates heat dissipation.

[0037] Furthermore, the length of the light shield has a certain length in the direction of light propagation, ranging from 1 to 50 mm, preferably 1.5 cm.

[0038] Furthermore, the end of the light shield is provided with a lens array, such as... Figure 7-8 As shown, each lens 4 in the lens array corresponds to one optical channel.

[0039] Furthermore, such as Figure 9As shown, the first surface of the lens is flat, and the second surface is curved. The radius of curvature of the second surface is controlled between 1 and 200 mm, so that the light emitted from the light-transmitting hole is converged into nearly parallel rays after passing through the lens. Furthermore, the lens array is a one-piece structure. During manufacturing, the lens array is processed as a single unit, so it can be directly installed on the end face of the light shield during installation. One-time alignment ensures that all LEDs are aligned simultaneously, eliminating the need for individual alignment of each LED. Alternatively, each lens can be set as a separate structure and installed in each light-transmitting hole of the light shield.

[0040] According to another aspect of this invention, a projector is also provided, equipped with the aforementioned parallel light source. The light emitted by the parallel light source of this invention exhibits excellent brightness uniformity, achieving a uniformity of 0.95 or higher within 100mm in front of the lens array. Figure 10 The image shown is a simulation test result diagram.

[0041] Although the illustrative specific embodiments of the present invention have been described above to enable those skilled in the art to understand the present invention, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims, and all utility model creations utilizing the concept of the present invention are within the scope of protection.

Claims

1. A parallel light source, characterized by The application relates to a parallel light source, comprising: an LED array arranged in a matrix on a plane; a light shield arranged at a first distance in front of the LED array, the light shield comprising a plurality of parallel light channels; an end of the light shield is provided with a lens array; the length of the light shield is 15 mm; the first distance between the LED array and the first end surface of the light shield is 0-20 mm; the inner wall surface of the light channel is a light absorption surface.

2. A parallel light source according to claim 1, characterized in that: The light shield comprises a plurality of parallel light channels, and the cross section of each light channel is rectangular or square, circular or elliptical.

3. A parallel light source according to claim 2, characterized in that: The light shield is separated by a plate material with a predetermined thickness between two adjacent light channels; the first surface of the lens is a plane, and the second surface is a curved surface.

4. A parallel light source according to claim 1, characterized in that: Each light channel of the light shield corresponds to one lamp bead in the LED array.

5. A parallel light source according to claim 1, characterized in that: Each lens in the lens array corresponds to one light channel.

6. A parallel light source according to claim 1, characterized in that: The lens array is an integrated structure, or each lens is an independent structure.

7. A projector characterized by comprising: The parallel light source is installed with one of the above claims 1-6.

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