Projection system
By designing a multi-lens magnification module in the projection system, the beam diameter adjustment is achieved, which solves the problem of difficult to take into account both zooming and high brightness in the existing projection system, and improves the brightness and reliability of the system.
Patent Information
- Application Number
- CN202420559495.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-03-21
AI Technical Summary
It is difficult for existing projection systems to take into account both the zoom and high brightness problems, resulting in brightness loss and thermal loss.
A projection system is designed, including a light source, a light composite module, an illumination module and a magnification module, which consists of a plurality of lenses, including at least two adjustable lenses or a liquid lens for adjusting the diameter of the light beam.
By adjusting the lens position in the zoom module or the curvature radius of the liquid lens, beam output of different diameters is achieved, which solves the problem of difficulty in both zooming and high brightness, and avoids brightness loss and thermal loss.
Smart Images
Figure CN222636470U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical display equipment, in particular to a projection system. Background Art
[0002] With the continuous development of the field of optical display, various display devices have entered people's lives, such as projection systems. The current projection systems have gradually achieved high-definition and multi-effect projection. At the same time, the size and weight of projection systems have become smaller and smaller, and gradually popularized in the home and commercial fields.
[0003] In recent years, with the increase in user demand, projection systems need to achieve various combinations of zoom applications such as different contrasts and different speckle contrasts. However, current projection systems usually use a variable aperture to achieve this. By adjusting the opening diameter of the variable aperture, light beams with different F numbers are output. This solution blocks the light outside the opening diameter, resulting in a loss of brightness. At the same time, the blocked light is converted into heat energy, which can easily cause thermal defocusing of the projection system or affect the reliability of other components.
[0004] That is to say, the projection system in the prior art has the problem that it is difficult to achieve both variable magnification and high brightness at the same time. Utility Model Content
[0005] The main purpose of the utility model is to provide a projection system to solve the problem that it is difficult to achieve both variable magnification and high brightness at the same time in the projection system in the prior art.
[0006] In order to achieve the above-mentioned purpose, the utility model provides a projection system, including: a light source; a light combining module, the light combining module is located on the light emitting side of the light source; an illumination module, the illumination module is located on the side of the light combining module away from the light source; a magnification module, the magnification module is located between the light combining module and the illumination module, the magnification module is used to adjust the diameter of the light beam, and the magnification module includes multiple lenses.
[0007] Furthermore, the zoom module includes at least two lenses with adjustable positions, or the zoom module includes at least one liquid lens, and the curvature radius of the surface of the liquid lens can be adjusted.
[0008] Furthermore, the zoom module is used to output light beams of at least two diameters, the at least two diameters include a first diameter and a second diameter, the first diameter is larger than the second diameter; and / or the diameter of the light beam output by the zoom module is greater than or equal to 1 mm and less than or equal to 40 mm.
[0009] Furthermore, the magnification module includes a first lens and a second lens in sequence along the light transmission direction, the positions of the first lens and the second lens on the optical axis can be adjusted, and the ratio of the focal length of the first lens to the focal length of the second lens is greater than or equal to -0.1 and less than or equal to -10; or the ratio of the focal length of the first lens to the focal length of the second lens is greater than or equal to 0.1 and less than or equal to 10.
[0010] Furthermore, the distance between the first lens and the second lens is greater than or equal to 0.5 mm and less than or equal to 100 mm.
[0011] Further, the first lens is a biconvex lens, and / or the second lens is a biconcave lens.
[0012] Furthermore, the zoom module includes a first lens and a second lens in sequence along the optical transmission direction, at least one of the first lens and the second lens is a lens with variable focal length, and / or the focal length variation range of the liquid lens satisfies: 10mm-300mm.
[0013] Further, at least one of the first lens and the second lens is a liquid lens, and the curvature radius of the surface of the liquid lens can be adjusted.
[0014] Furthermore, the projection system also includes a light homogenization module, which is located between the zoom module and the illumination module. The light homogenization module includes a compound eye component, which includes two single-sided compound eye structures or one double-sided compound eye structure.
[0015] Furthermore, the projection system also includes a light homogenization module, which is located between the zoom module and the illumination module. The light homogenization module includes a converging lens and a light rod structure. The converging lens converges the light beam output by the zoom module into the light rod structure.
[0016] Applying the technical solution of the utility model, the projection system includes a light source, a light combining module, an illumination module and a magnification module. The light combining module is located on the light emitting side of the light source; the illumination module is located on the side of the light combining module away from the light source; the magnification module is located between the light combining module and the illumination module. The magnification module is used to adjust the diameter of the light beam, and the magnification module includes multiple lenses.
[0017] The light beam emitted by the light source is introduced into the variable magnification module through the light combining module, and the diameter of the light beam is adjusted through the variable magnification module, so that at least two diameters of light beams can be output, and then the light beam output by the variable magnification module enters the subsequent lighting system. By setting the variable magnification module between the light combining module and the lighting module, and reasonably constraining the variable magnification module to include multiple lenses, the output of light beams at different angles can be achieved by adjusting the variable magnification module, thereby achieving applications such as different contrasts and different speckle contrasts, while avoiding the loss of light by using a variable iris and affecting the reliability of other devices. The multiple lenses in the variable magnification module will not block the light and will not cause loss of light, which is conducive to ensuring high brightness. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:
[0019] Figure 1 A schematic diagram of the optical paths of the zoom module and the light homogenization module of the projection system of the first embodiment of the utility model is shown;
[0020] Figure 2 A schematic diagram of the optical paths of the zoom module and the light homogenization module of the projection system of the second embodiment of the utility model is shown;
[0021] Figure 3 A schematic diagram of the optical paths of the zoom module and the light homogenization module of the projection system of the third embodiment of the present utility model is shown;
[0022] Figure 4 A schematic diagram of the optical path of a projection system of an optional embodiment of the utility model is shown.
[0023] The above drawings include the following reference numerals:
[0024] 10. Zoom module; 11. First lens; 12. Second lens; 20. Light homogenization module; 21. Double-sided compound eye structure; 22. Converging lens; 23. Light rod structure; 30. Light source; 40. Light combining module; 50. Illumination module; 60. Lens. DETAILED DESCRIPTION
[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.
[0027] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.
[0028] In order to solve the problem that it is difficult to simultaneously take into account variable magnification and high brightness in the projection system in the prior art, the utility model provides a projection system.
[0029] like Figures 1 to 4 As shown, the projection system includes a light source 30, a light combining module 40, an illumination module 50 and a magnification module 10. The light combining module 40 is located on the light emitting side of the light source 30; the illumination module 50 is located on the side of the light combining module 40 away from the light source 30; the magnification module 10 is located between the light combining module 40 and the illumination module 50. The magnification module 10 is used to adjust the diameter of the light beam, and the magnification module 10 includes multiple lenses.
[0030] The light beam emitted by the light source 30 is introduced into the variable magnification module 10 through the light combining module 40, and the diameter of the light beam is adjusted through the variable magnification module 10, so as to output light beams of at least two diameters, and the light beams of different diameters enter the illumination module 50 to generate illumination light beams of different F numbers. By arranging the variable magnification module 10 between the light combining module 40 and the illumination module 50, and reasonably constraining the variable magnification module 10 to include multiple lenses, the output of light beams of different diameters is achieved by adjusting the variable magnification module 10, thereby achieving applications such as different contrasts and different speckle contrasts, while avoiding the situation of using a variable iris to lose light and affect the reliability of other devices. The multiple lenses in the variable magnification module 10 will not block the light, will not cause the loss of light, and will help to ensure high brightness.
[0031] It should be noted that the reference Figure 4 The light source 30 of the present application at least includes a blue light source, a green light source and a red light source. The light combining module 40 includes a reflector and a dichroic mirror, which is used to combine the light emitted by the light source 30 so that the light from multiple light sources 30 is transmitted in the same direction. The projection system of the present application also includes a lens 60 and a light homogenization module 20. The lens 60 is located on the light output side of the illumination module 50. The light homogenization module 20 is located between the zoom module 10 and the illumination module 50. The light homogenization module 20 is used to homogenize the light so that the output light brightness is more uniform. Figure 4 In the figure, the light homogenizing module 20 is a double-sided compound eye structure 21, and in actual setting, it can also be set as two single-sided compound eye structures set opposite to each other. The lighting module 50 at least includes a double convex lens, a prism, and a chip arranged in sequence along the light path. The light emitted by the light homogenizing module 20 passes through the double convex lens and the prism in sequence and then enters the chip. The light reflected by the chip enters the lens 60 through the prism.
[0032] Specifically, the zoom module 10 can be adjusted continuously to achieve continuous change in the diameter of the output light beam. Optionally, the zoom module 10 is used to output light beams of at least two diameters, and the at least two diameters include a first diameter and a second diameter, and the first diameter is greater than the second diameter, that is, the light beam emitted by the light source 30 enters the zoom module 10 after passing through the light combining module 40, and the zoom module 10 is used to adjust the divergence angle of the light beam and adjust the diameter of the light beam, so that by adjusting the zoom module 10 to output at least two light beams of one large and one small diameter, that is, outputting two light beams of one large and one small F number, thereby achieving high brightness and different contrast and different speckle contrast presentation effects.
[0033] In an optional embodiment of the present application, the diameter of the light beam output by the zoom module 10 is greater than or equal to 1 mm and less than or equal to 40 mm. The F number range is F / 1.2 to F / 3.5. The size of the F number depends on the actual situation.
[0034] In an optional embodiment of the present application, the zoom module 10 includes at least two lenses with adjustable positions, and the focal lengths of the two lenses are fixed. By adjusting the positions of the two lenses on the optical axis and adjusting the distance between the two lenses, the zoom ratio of the light can be flexibly adjusted.
[0035] In another optional embodiment of the present application, the magnification module 10 includes at least one liquid lens, and the curvature radius of the surface of the liquid lens can be adjusted. The liquid lens changes the surface shape of the liquid lens by applying voltage, thereby changing the curvature radius and further achieving a change in focal length.
[0036] The projection system of the present application is described below in conjunction with specific embodiments and drawings.
[0037] Embodiment 1
[0038] like Figure 1 , which describes a schematic diagram of the optical paths of the zoom module 10 and the light homogenization module 20 of the projection system of the first embodiment.
[0039] In this embodiment, the zoom module 10 includes a first lens 11 and a second lens 12 in sequence along the optical transmission direction. The positions of the first lens 11 and the second lens 12 on the optical axis can be adjusted so that the distance between the first lens 11 and the second lens 12 can be adjusted. The first lens 11 and the second lens 12 are both lenses with fixed focal lengths and shapes. The first lens 11 is used for zooming, and the second lens 12 is used for compensation. The combined light beam enters the zoom module 10, passes through the first lens 11 and the second lens 12 in sequence, and then exits to the light homogenization module 20.
[0040] In the present embodiment, the light homogenization module 20 includes a compound eye component, and the compound eye component includes two single-sided compound eye structures or a double-sided compound eye structure 21, one side surface of the single-sided compound eye structure has a microlens array, and the two single-sided compound eye structures have one side of the microlens array arranged opposite to each other, and both side surfaces of the light incident side and the light output side of the double-sided compound eye structure 21 have microlens arrays. The microlens array includes a plurality of microlenses, and the plurality of microlenses are arranged in an array. It should be noted that in the present embodiment, the compound eye component is a double-sided compound eye structure 21, but in other optional embodiments, two relative single-sided compound eye structures may also be provided, depending on the actual situation.
[0041] like Figure 1 As shown, since the positions of the first lens 11 and the second lens 12 on the optical axis are movable, the zoom module 10 can flexibly adjust the zoom ratio of the light. The solid line with an arrow in the figure shows a small-aperture light beam after zooming, and the dotted line with an arrow is a large-aperture light beam with another zoom ratio. Light of the two beam diameters is homogenized by the double-sided compound eye element 21 and then enters the subsequent lighting module 50, realizing two F numbers, one large and one small.
[0042] Specifically, since the small F number light is not blocked by the aperture, the solution of this embodiment can achieve high contrast and reduce the risk of heat dissipation without losing brightness. When the speckle contrast needs to be reduced, the present application can increase the light F number, which can be adjusted to be consistent with the aperture opening of the lens 60 or exceed the aperture opening diameter of the lens 60, to achieve the best balance between brightness, contrast and speckle contrast.
[0043] In this embodiment, the distance between the first lens 11 and the second lens 12 is greater than or equal to 0.5 mm and less than or equal to 100 mm.
[0044] In this embodiment, the ratio of the focal length of the first lens 11 to the focal length of the second lens 12 is greater than or equal to -0.1 and less than or equal to -10; or the ratio of the focal length of the first lens 11 to the focal length of the second lens 12 is greater than or equal to 0.1 and less than or equal to 10.
[0045] In this embodiment, the first lens 11 is a biconvex lens with positive optical power, and the second lens 12 is a biconcave lens with negative optical power. By reasonably constraining the optical power and surface shape of the first lens 11, it is helpful to ensure the convergence effect of the first lens 11. By reasonably constraining the optical power and surface shape of the second lens 12, it is helpful to ensure the diffusion effect of the second lens 12.
[0046] Embodiment 2
[0047] like Figure 2 , which describes a schematic diagram of the optical paths of the zoom module 10 and the light homogenization module 20 of the projection system of the second embodiment.
[0048] The difference between this embodiment and the first embodiment is that the light homogenization module 20 is different. In this embodiment, the light homogenization module 20 includes a converging lens 22 and a light rod structure 23, and the converging lens 22 converges the light beam output by the zoom module 10 into the light rod structure 23. After passing through the zoom module 10, the combined light beam passes through the converging lens 22 and enters the light rod structure 23. The zoom module 10 of this embodiment is the same as the zoom module 10 of the first embodiment, that is, by adjusting the relative position of the first lens 11 and the second lens 12 on the optical axis, the output light beam aperture can be changed, and the corresponding illumination light F number changes. The final effect is the same as that of the first embodiment, which will not be repeated here.
[0049] Embodiment 3
[0050] like Figure 3 , which describes a schematic diagram of the optical paths of the zoom module 10 and the light homogenization module 20 of the projection system of the third embodiment.
[0051] The difference between this embodiment and the first embodiment is that the zoom module 10 is different.
[0052] In this embodiment, the zoom module 10 includes a first lens 11 and a second lens 12 in sequence along the optical transmission direction, and at least one of the first lens 11 and the second lens 12 is a lens with a variable focal length. Specifically, at least one of the first lens 11 and the second lens 12 is a liquid lens, and the curvature radius of the surface of the liquid lens can be adjusted by applying an external voltage.
[0053] In this embodiment, the focal length of the liquid lens varies within the range of 10 mm to 300 mm.
[0054] The zoom system of this embodiment adjusts the zoom ratio by changing the focal length of the first lens 11 and the second lens 12, and the relative positions of the first lens 11 and the second lens 12 do not change. The combined light enters the zoom module 10, passes through the first lens 11 and the second lens 12 in sequence, enters the double-sided compound eye structure 21, and then enters the lighting module 50. Since the focal lengths of the first lens 11 and the second lens 12 are variable, the diameter of the light output by the zoom module 10 can be flexibly adjusted, thereby flexibly adjusting the zoom ratio of the light directly, and realizing light beams with different F numbers.
[0055] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0056] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0057] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.
[0058] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A projection system, characterized in that: include: Light source (30); A light combining module (40), the light combining module (40) being located on the light emitting side of the light source (30); an illumination module (50), the illumination module (50) being located on a side of the light combining module (40) away from the light source (30); A magnification module (10), the magnification module (10) being located between the light combining module (40) and the lighting module (50), the magnification module (10) being used to adjust the diameter of a light beam, and the magnification module (10) comprising a plurality of lenses.
2. The projection system according to claim 1, characterized in that: The variable power module (10) comprises at least two lenses whose positions can be adjusted, or the variable power module (10) comprises at least one liquid lens, and the curvature radius of the surface of the liquid lens can be adjusted.
3. The projection system according to claim 1, characterized in that: The variable power module (10) is used to output light beams of at least two diameters, the at least two diameters comprising a first diameter and a second diameter, the first diameter being larger than the second diameter; and / or the diameter of the light beam output by the variable power module (10) is greater than or equal to 1 mm and less than or equal to 40 mm.
4. The projection system according to claim 1, characterized in that: The zoom module (10) comprises a first lens (11) and a second lens (12) in sequence along the transmission direction of the optical path; the positions of the first lens (11) and the second lens (12) on the optical axis are adjustable; the ratio of the focal length of the first lens (11) to the focal length of the second lens (12) is greater than or equal to -0.1 and less than or equal to -10; or the ratio of the focal length of the first lens (11) to the focal length of the second lens (12) is greater than or equal to 0.1 and less than or equal to 10.
5. The projection system according to claim 4, characterized in that: The distance between the first lens (11) and the second lens (12) is greater than or equal to 0.5 mm and less than or equal to 100 mm.
6. The projection system according to claim 4, characterized in that: The first lens (11) is a biconvex lens, and / or the second lens (12) is a biconcave lens.
7. The projection system according to claim 1, characterized in that: The variable magnification module (10) comprises a first lens (11) and a second lens (12) in sequence along the light path transmission direction, and at least one of the first lens (11) and the second lens (12) is a lens with a variable focal length.
8. The projection system according to claim 7, characterized in that: At least one of the first lens (11) and the second lens (12) is a liquid lens, the curvature radius of the surface of the liquid lens can be adjusted, and / or the focal length variation range of the liquid lens satisfies: 10mm-300mm.
9. The projection system according to any one of claims 1 to 8, characterized in that: The projection system further comprises a light homogenization module (20), the light homogenization module (20) being located between the zoom module (10) and the illumination module (50), the light homogenization module (20) comprising a compound eye component, the compound eye component comprising two single-sided compound eye structures or one double-sided compound eye structure (21).
10. The projection system according to any one of claims 1 to 8, characterized in that: The projection system further comprises a light homogenizing module (20), the light homogenizing module (20) being located between the zoom module (10) and the illumination module (50), the light homogenizing module (20) comprising a converging lens (22) and a light rod structure (23), the converging lens (22) converging the light beam output by the zoom module (10) into the light rod structure (23).