Optical projection device

Abstract

The utility model discloses an optical projection device which comprises a light source and a plurality of projection modules, each projection module is a single lens or a micro lens array, the light source is a white light led, and each projection module further comprises a light filtering structure used for achieving color change of a projection pattern. According to the optical projection device, the white light source is adopted, the light filtering structure is arranged at any position of a light path so as to change the color of a projection pattern, the light filtering structure can adopt a variable-light-transmittance light filter or a liquid crystal screen, the white light source is located on the optical axis, the light emitting energy of the light source is higher, imaging is clearer, the lighting effect of the system is higher, and the color mixing space is larger.

Description

Technical Field

[0001] The utility model relates to an optical projection device. Background Art

[0002] To achieve color-changing patterns, existing optical projection devices, whether single-lens or micro-lens array solutions, typically use RGB LEDs as their light source, controlling the driving of the three RGB colors separately to achieve different color mixing. However, due to the large spacing between the three primary colors of RGB LEDs, the imaging quality of each primary color pattern is poor and the color mixing space is small. Summary of the Invention

[0003] Purpose of the utility model: The purpose of the utility model is to provide an optical projection device to solve the problems of poor imaging quality and small color mixing space when realizing color-changing patterns in the prior art.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] An optical projection device includes a light source and multiple projection modules, wherein the projection modules are single lenses or microlens arrays. The device is characterized in that the light source is a white light LED, and each projection module further includes a filter structure for achieving color change of the projection pattern.

[0006] Furthermore, the white light LED is single or multiple.

[0007] Furthermore, the filter structure is a variable transmittance filter or a liquid crystal screen.

[0008] Furthermore, the microlens array includes a focusing microlens array, an image array, and a projection microlens array arranged in sequence along the direction of light propagation. Each sub-focusing microlens of the focusing microlens array, each sub-image of the image array, and each sub-projection microlens of the projection microlens array correspond to each other one by one. The corresponding sub-focusing microlenses, sub-images, and sub-projection microlenses together constitute a sub-optical projection channel. The light emitted by the light source passes through each sub-optical projection channel. The refractive power of the sub-focusing microlens is configured so that the light passing through the sub-focusing microlens only passes through the corresponding sub-image and sub-projection microlens in sequence. After the light passing through the sub-image is focused by the sub-projection microlens, an image of the sub-image is formed at the imaging position. The images of all sub-images at the imaging position are combined into a complete pattern to be projected.

[0009] Furthermore, the filter structure is located between the light source and the light-collecting micro-lens array, between the light-collecting micro-lens array and the projection micro-lens array, or on the side of the projection micro-lens array away from the light source.

[0010] Furthermore, the microlens array further includes a collimating microlens array, which is disposed on the side of the condenser microlens array facing the light source. Each sub-collimating microlens of the collimating microlens array corresponds to a sub-optical projection channel.

[0011] Furthermore, the microlens array further includes a prism array, which is disposed on the side of the projection microlens array away from the light source. Each sub-prism of the prism array corresponds to a sub-optical projection channel.

[0012] Furthermore, the single lens includes a condenser lens, an image source, and a projection lens sequentially arranged along the light propagation direction. The condenser lens, the image source, and the projection lens form an optical projection channel.

[0013] Furthermore, the filter structure is located between the light source and the condenser lens, between the condenser lens and the projection lens, or on the side of the projection lens away from the light source.

[0014] Beneficial effects: The optical projection device uses a white light source, and a filter structure is arranged at any position in the optical path to change the color of the projected pattern. The filter structure can use a variable transmittance filter or a liquid crystal screen. The white light source is on the optical axis, and the light emission energy of the light source is higher, making the imaging clearer, the system light efficiency higher, and the color mixing space larger. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the optical projection device according to Embodiment 1 of the present invention.

[0016] Figure 2 It is a schematic structural diagram of the optical projection device according to Embodiment 2 of the present invention.

[0017] Figure 3 It is a schematic structural diagram of the optical projection device according to Embodiment 3 of the present invention.

[0018] Figure 4 It is a schematic structural diagram of the optical projection device according to Embodiment 4 of the present invention.

[0019] Figure 5 It is a schematic structural diagram of the optical projection device according to Embodiment 5 of the present invention.

[0020] Figure 6 It is a schematic structural diagram of the optical projection device according to Embodiment 6 of the present invention.

[0021] In the figure: 1 - light source; 2 - projection module; 3 - condenser microlens array; 4 - image array; 5 - projection microlens array; 6 - variable transmittance filter; 7 - liquid crystal screen; 8 - collimating microlens array; 9 - prism array; 10 - condenser lens; 11 - image source; 12 - projection lens. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following further explains the present utility model in conjunction with the accompanying drawings.

[0023] As Figure 1 shown, the optical projection device of the first embodiment of the present utility model includes a light source 1 and a plurality of projection modules 2. The light source 2 is a single white LED, and the projection module 2 is a microlens array. The microlens array includes a condenser microlens array 3, an image array 4, and a projection microlens array 5 arranged in sequence along the light propagation direction. Each sub-condenser microlens of the condenser microlens array 3, each sub-image of the image array 4, and each sub-projection microlens of the projection microlens array 5 correspond one by one. The corresponding sub-condenser microlens, sub-image, and sub-projection microlens jointly form a sub-optical projection channel. The light emitted by the light source 1 passes through each sub-optical projection channel. The diopter of the sub-condenser microlens is configured such that the light passing through the sub-condenser microlens only passes through the corresponding sub-image and sub-projection microlens in sequence. After the light passing through the sub-image is focused by the sub-projection microlens, an image of the sub-image is formed at the imaging position. The images of all sub-images at the imaging position are combined into a complete pattern to be projected. Each projection module 2 further includes a light filtering structure for realizing the color change of the projection pattern.

[0024] In this embodiment, the light filtering structure is located on the side of the projection microlens array 5 away from the light source 2. The light filtering structure is a liquid crystal screen 7. Multiple regions of the liquid crystal screen 7 respectively correspond to different projection modules 2. By electronically controlling the arrangement state of the liquid crystal material in different regions of the liquid crystal screen 7, the color of the light that can pass through different regions can be adjusted, thereby realizing the color change of the projection pattern.

[0025] As Figure 2 shown, the optical projection device of the second embodiment of the present utility model. In this embodiment, the light source 2 is multiple white LEDs, the projection module 2 is a microlens array, the light filtering structure is located between the light source 1 and the condenser microlens array 3, and the light filtering structure is a variable transmittance filter 6. By adjusting its transmittance, the color of the light passing through each projection module 2 can be changed, thereby realizing the color change of the projection pattern.

[0026] As Figure 3 shown, the optical projection device of the third embodiment of the present utility model. In this embodiment, the light source 2 is multiple white LEDs, the projection module 2 is a microlens array, the light filtering structure is located between the condenser microlens array 3 and the projection microlens array 5, and the light filtering structure is a variable transmittance filter 6.

[0027] As Figure 4 shown, the optical projection device of the fourth embodiment of the present utility model. In this embodiment, the light source 2 is a single white LED, the projection module 2 is a microlens array, the light filtering structure is located between the light source 1 and the condenser microlens array 3, and the light filtering structure is a variable transmittance filter 6.

[0028] The microlens array also includes a collimating microlens array 8, which is arranged on the side of the focusing microlens array 3 facing the light source 1. Each sub-collimating microlens of the collimating microlens array 8 corresponds to a sub-optical projection channel. The collimating microlens array 8 is used to reduce the deflection angle of light within the sub-optical projection channel.

[0029] like Figure 5 As shown, the optical projection device of the fifth embodiment of the present invention, in this embodiment, the light source 2 is a plurality of white light LEDs, the projection module 2 is a microlens array, the filtering structure is located on the side of the projection microlens array 5 away from the light source 2, and the filtering structure is a liquid crystal screen 7.

[0030] The microlens array also includes a collimating microlens array 8 and a prism array 9. The collimating microlens array 8 is positioned on the side of the focusing microlens array 3 facing the light source 1, and the prism array is positioned on the side of the projection microlens array 5 facing away from the light source 1. Each sub-collimating microlens in the collimating microlens array 8 and each sub-prism in the prism array 9 corresponds to a sub-optical projection channel. The collimating microlens array 8 is used to reduce the deflection angle of light within the sub-optical projection channel. The prism array 9 is used to achieve targeted deflection of light passing through each sub-optical projection channel.

[0031] like Figure 6 As shown, the optical projection device of Example 6 of the present invention comprises a plurality of white light LEDs in the light source 2, and a single lens in the projection module 2. The lens comprises a condenser lens 10, an image source 11, and a projection lens 12, which are sequentially arranged along the direction of light propagation. The condenser lens 10, image source 11, and projection lens 12 form an optical projection channel. The filter structure is located on the side of the projection lens 12 away from the light source 2, and the filter structure is a liquid crystal screen 7.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An optical projection device, comprising a light source and a plurality of projection modules, the projection modules being single lenses or microlens arrays, characterized in that: The light source is a white LED, and each projection module further includes a filter structure for realizing the change of the color of the projected pattern.

2. An optical projection device according to claim 1, characterized in that: The white LED is single or multiple.

3. An optical projection device according to claim 1, characterized in that: The filter structure is a variable transmittance filter or a liquid crystal screen.

4. An optical projection device according to claim 1, characterized in that: The microlens array includes a condenser microlens array, an image array, and a projection microlens array arranged in sequence along the light propagation direction. Each sub-condenser microlens of the condenser microlens array, each sub-image of the image array, and each sub-projection microlens of the projection microlens array correspond one by one. The corresponding sub-condenser microlens, sub-image, and sub-projection microlens together form a sub-optical projection channel. The light emitted by the light source passes through each sub-optical projection channel. The diopter of the sub-condenser microlens is configured such that the light passing through the sub-condenser microlens only passes through the corresponding sub-image and sub-projection microlens in sequence. After the light passing through the sub-image is focused by the sub-projection microlens, an image of the sub-image is formed at the imaging position. The images of all sub-images at the imaging position are combined into a complete pattern to be projected.

5. An optical projection device according to claim 4, characterized in that: The filter structure is located between the light source and the condenser microlens array, between the condenser microlens array and the projection microlens array, or on the side of the projection microlens array away from the light source.

6. An optical projection device according to claim 4, wherein: The microlens array further includes a collimating microlens array. The collimating microlens array is arranged on the side of the condenser microlens array facing the light source, and each sub-collimating microlens of the collimating microlens array corresponds to a sub-optical projection channel.

7. An optical projection device according to claim 4, characterized in that: The microlens array further includes a prism array. The prism array is arranged on the side of the projection microlens array away from the light source, and each sub-prism of the prism array corresponds to a sub-optical projection channel.

8. An optical projection device according to claim 1, characterized in that: The single lens includes a condenser lens, an image source, and a projection lens arranged in sequence along the light propagation direction. The condenser lens, the image source, and the projection lens form an optical projection channel.

9. An optical projection device according to claim 8, characterized in that: The filter structure is located between the light source and the condenser lens, between the condenser lens and the projection lens, or on the side of the projection lens away from the light source.

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