An arrayed air-imaging holographic optical system

Abstract

The application discloses an array type air imaging holographic optical system, which comprises an image source for displaying a pattern, and an array type lens group for refracting light emitted by the image source and forming an enlarged real image in air; the array type lens group comprises a plurality of lenses which are arranged in a matrix mode. The application has the advantages that, compared with a single Fresnel lens used as an imaging unit, the array type lens group is composed of a plurality of lenses arranged in a matrix mode, so that the formed real image is more delicate, and the image aberration can be effectively reduced, and a clearer image can be obtained.

Description

Technical Field

[0001] The invention relates to an array-type air imaging holographic optical system. Background Art

[0002] Three-dimensional real image imaging devices generally use air imaging flat plate lenses to form images in the air. Air imaging flat plate lenses generally use long strip reflectors or dihedral corner reflectors. The dihedral corner reflector solution uses two transparent substrates to print periodic and equal-sized dihedral rectangular reflectors or long strip reflectors at a 45° angle between them, and performs air imaging through secondary reflection.

[0003] However, the current air imaging device has a magnification ratio of only 1, and its optical system does not have the magnification function, which results in a large size and limits its application areas. At the same time, its imaging system is not conducive to the miniaturization of the device. Summary of the Invention

[0004] The object of the present invention is to provide an array-type air imaging holographic optical system, which can effectively solve the problem that existing air imaging devices are too large and have limited application fields.

[0005] In order to solve the above technical problems, the present invention is implemented through the following technical solutions: an array-type air imaging holographic optical system, comprising:

[0006] Image source for displaying the pattern;

[0007] and an array lens group for refracting light emitted by an image source to form a magnified real image in the air;

[0008] The array lens group includes a plurality of lenses, and all the lenses are arranged in a matrix.

[0009] Preferably, the lens is a microlens, which allows the array lens group to have more lens units and improve the fineness of the picture.

[0010] Preferably, the lens is a Fresnel lens, which is inexpensive and easy to manufacture, and can make the entire array lens group thinner and lighter.

[0011] Preferably, a first reflector is provided on the optical path between the image source and the array lens assembly; and / or a second reflector is provided on the optical path between the array lens assembly and the real image. Using reflectors to adjust the positions of the image source, the array lens assembly, and the real image allows for efficient space utilization and facilitates layout.

[0012] Preferably, the size of the array lens group is larger than the size of the formed real image, so that the user can view the complete image.

[0013] Preferably, the image source is one or more light sources, and a suitable image source is selected according to the accuracy of the image to be displayed.

[0014] Preferably, when the image source is a plurality of light sources, the light sources are arranged in a matrix, which makes it easier to edit the content to be displayed by different light sources.

[0015] Preferably, the image source is one of LCD, LED, OLED, LCOS or a projector, which reduces the cost and threshold of the image source and has wider adaptability.

[0016] Preferably, the projector is a DLP projector or a laser MEMS module, and a diffusion sheet is provided between the projector and the array lens group. The addition of the diffusion sheet increases the divergence angle of the image source and expands the angle at which the human eye observes the real image.

[0017] Preferably, the light transmittance of the diffusion sheet is 70%±10%. If the light transmittance is too high, the observer can see the bright projection point of the projector. If the light transmittance is too low, the image will be blurred and the brightness will be insufficient.

[0018] Compared with the existing technology, the advantages of the present invention are: the use of an array lens group changes the previous principle of imaging by reflection using a long reflector or a dihedral corner reflector, and uses the refraction principle of the array lens group to form an enlarged real image in the air, so that when the image source is small, an image much larger than the image source can be obtained. Compared with the traditional air imaging system, it can not only effectively reduce the weight of the entire device, but also effectively reduce the production cost.

[0019] Compared with using a single Fresnel lens as an imaging unit, the array lens group is composed of multiple lenses arranged in a matrix, which can make the real image more delicate and effectively reduce aberrations to obtain a clearer image. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of a first embodiment of an array-type air imaging holographic optical system according to the present invention;

[0021] Figure 2 This is a diagram illustrating the imaging principle of embodiment 1 of an array-type air imaging holographic optical system of the present invention;

[0022] Figure 3 This is a schematic structural diagram of a second embodiment of an array-type air imaging holographic optical system according to the present invention;

[0023] Figure 4 This is an imaging principle diagram of Example 2 of an array-type air imaging holographic optical system of the present invention;

[0024] Figure 5A stereoscopic diagram of an array lens group composed of micro lenses in an array air imaging holographic optical system of the present invention;

[0025] Figure 6 This is a diagram showing the imaging principle of an array-type air imaging holographic optical system of the present invention using multiple light sources and an array-type lens group;

[0026] Figure 7 The present invention provides a stereoscopic view of an array lens group composed of Fresnel lenses in an array air imaging holographic optical system. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0030] Example 1:

[0031] See Figure 1 、 Figure 2 This is a first embodiment of an array-type air imaging holographic optical system of the present invention, an array-type air imaging holographic optical system comprising:

[0032] An image source 1 for displaying a pattern;

[0033] and an array lens group 3 for refracting the light emitted by the image source 1 to form an enlarged real image 5 in the air;

[0034] The array lens group 3 includes a plurality of lenses 31 , and all lenses 31 are arranged in a matrix.

[0035] To achieve a magnified real image 5, the array lens assembly 3 generally employs the principle of a convex lens, and the distance between the image source 1 and the array lens assembly 3 is maintained between one and two focal lengths. The multiple lenses can be understood as a combination of multiple individual lenses. For better imaging, each lens can be square, allowing for seamless splicing between adjacent lenses. The so-called array arrangement is generally arranged in rows and columns, with the number of rows generally being equal to or greater than two, and the number of columns also being equal to or greater than two.

[0036] like Figure 5 、 Figure 7 As shown, the lens can be a microlens or a Fresnel lens. The lens can be freely selected according to the design cost of the product. Of course, it can also be a glass convex lens. Each lens unit can be directly manufactured integrally on a substrate during processing to reduce the impact of the gap between lenses on the imaging quality. The parameters of each lens can be exactly the same, and the lens parameters at different positions can be adjusted accordingly according to the characteristics of the real image.

[0037] The image source 1 of the above system can adopt one of LCD, LED, OLED or LCOS. These image sources 1 have relatively mature display technology, are relatively easy to obtain, and are relatively easy to control in cost. They are suitable for use when the image source 1 is not too large.

[0038] like Figure 6 As shown, the image source 1 can be a light source, such as an LCD display, or multiple light sources 32, such as a display group composed of multiple LCD displays. The multiple light sources can also be arranged in an array form, and the number of light sources can be equal to or different from the number of lenses.

[0039] For the entire optical system, in order to rationally arrange the system and improve space utilization, a first reflector 2 can be added between the image source 1 and the array lens group 3, and a second reflector 4 can be added to the optical path between the array lens group 3 and the real image 5, and the reflectors can be used to adjust the direction of the light.

[0040] like Figure 2 As shown, the image source 1 is set vertically, the array lens group 3 is set horizontally, the first reflector 2 and the second reflector 4 are both at 45 degrees to the horizontal plane, and the light emitted by the image source 1 is reflected by the first reflector 2 and vertically enters the array lens group 3. After being refracted by the array lens group 3, the light is irradiated on the second reflector 4 and is reflected by the second reflector 4 to form a real image 5 in the air. What the user sees is the image suspended in the air. The size of the real image 5 is larger than that of the image source 1, so it can be understood that an enlarged real image 5 is obtained.

[0041] Example 2:

[0042] like Figure 3 、 Figure 4 The difference from the first embodiment is that the image source 1 is changed to a projector 6, such as a DLP projector 6 or a laser MEMS module. Since the light-emitting characteristics of the image source 1 are changed, a diffuser 7 is added between the projector 6 and the array lens group 3 to increase the divergence angle of the image source 1 and expand the angle at which the human eye observes the real image 5. Generally speaking, the transmittance of the diffuser 7 is 70%±10%. If the transmittance is higher than 80%, the observer can see the bright projection point of the projector 6, while if the transmittance is lower than 60%, the image will be blurred and the brightness will be insufficient, which will affect the user's use.

[0043] Compared with the first embodiment, the second embodiment replaces the image source 1 that can form a larger source image for use in scenes that present a larger real image 5. For larger display scenes, the cost and volume of the projector 6 are significantly lower than the image source 1 of the first embodiment.

[0044] The above-mentioned solution adopts an array lens group 3, which changes the previous principle of imaging by reflection using a long reflector or a dihedral corner reflector. The refraction principle of the array lens group 3 is used to form an enlarged real image 5 in the air, so that when the image source 1 is small, an image much larger than the image source 1 can be obtained. Compared with the traditional air imaging system, it can not only effectively reduce the weight of the entire device, but also effectively reduce the production cost.

[0045] Compared with using a single Fresnel lens as an imaging unit, the array lens group 3 is composed of multiple lenses arranged in a matrix, which can make the real image 5 more delicate and effectively reduce aberrations to obtain a clearer image.

[0046] The above description is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the scope of the present invention are included in the patent scope of the present invention.

Claims

1. An array-type air imaging holographic optical system, characterized by: include: An image source for displaying patterns, wherein the image source is a projector, and the projector is a DLP projector or a laser MEMS module. A diffuser is provided between the projector and the array lens assembly, and the transmittance of the diffuser is 70% ± 10%; and an array lens group for refracting light emitted by an image source to form a magnified real image in the air; The distance between the image source and the array lens group is one to two times the focal length; The array lens group includes a plurality of lenses, each of which is a Fresnel lens. All lenses are arranged in a matrix, each lens is a square, and adjacent lenses are seamlessly spliced; A first reflector is further provided on the optical path between the image source and the arrayed lens group; and / or a second reflector is provided on the optical path between the arrayed lens group and the real image.

2. The array-type air imaging holographic optical system according to claim 1, characterized in that: The size of the array lens group is larger than the size of the formed real image.

3. The array-type air imaging holographic optical system according to claim 1, characterized in that: The image source is one or more light sources.

4. The array-type air imaging holographic optical system according to claim 3, characterized in that: When the image source is a plurality of light sources, the light sources are arranged in a matrix.

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