Telescope augmented reality optical system
By designing two optical path systems in a telescope and using the projection method of refracting mirror assembly and semi-pentaprism assembly, the display content is superimposed on the scenery, which solves the inconvenience of use, insufficient comfort and poor image quality in the prior art. The problem achieves a clearer observation experience.
Patent Information
- Application Number
- CN202411273089.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2024-12-10
AI Technical Summary
When expanding functions, existing telescopes are inconvenient to use, insufficient observation comfort and poor image quality. Especially when the external display screen cannot observe the expansion function information at the same time, the built-in display screen causes discomfort in the eyes and distorted scenery.
Design a telescope augmented reality optical system, which includes two optical path systems. The telescope path and the real image position of the AR optical path are the same, both located in front of the eyepiece, and use a refracting mirror assembly and a semi-pentaprism assembly to superimpose the display content on the projection method. On the scene, and magnified imaging is performed through the eyepiece group, using spectroscopic prisms and spectroscopic films to improve image quality and increase the aperture to reduce field curve.
It achieves easy to use, comfortable observation and clearer imaging. Users can observe distant scenery and expand functional information in the eyepiece at the same time, avoiding the problem of eye discomfort and improving image quality.
Smart Images
Figure CN119105166A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to optical systems, and in particular relates to a telescope augmented reality optical system. Background Art
[0002] With the advancement of technology and the development of the market, consumers' demand for telescopes is no longer limited to a single telescope function. Currently, there are multifunctional telescopes on the market that have features such as distance measurement, compass, level, and object recognition. These telescopes can combine information such as distance, direction, and scene name with the observed scene. Most of these telescopes use external or built-in displays, which often bring problems such as inconvenience in use, poor observation comfort, and poor image quality.
[0003] With the continuous advancement of science and technology and the improvement of people's living standards, telescopes have gradually moved from professional scientific instruments to ordinary families and become an essential tool for people's leisure and entertainment, outdoor adventures, stargazing and other activities. Consumers' demand for telescopes is also increasing, and telescopes with functions such as distance measurement, compass, level, and object recognition have gradually become consumers' first choice. Currently, most telescopes on the market with the above-mentioned extended functions use AR technology. AR (Augmented Reality) is a technology that superimposes digital information on scenes in the real world. By using optoelectronic display technology, interactive technology, a variety of sensor technologies, and computer graphics and multimedia technologies, the computer-generated virtual environment is integrated with the real environment around the user, so that the user can be convinced from the sensory effect that the virtual environment is an integral part of the real environment around him.
[0004] For telescopes, the following structure is generally used.
[0005] 1. External display screen: The display screen of this type of telescope is independent of the telescope optical path system. The display screen is located outside the telescope optical path. Through the conversion of optical and electrical signals, the extended function information is presented on the external display screen.
[0006] 2. Built-in display: The display of this type of telescope is combined with the telescope system (see Figure 1a and Figure 1b ), a display screen 5 is placed at the eyepiece image plane 4 in the optical path of the telescope, and the display screen can be a liquid crystal display screen or a high-transmittance display screen. The extended function information is displayed on the display screen 5, and then magnified by the eyepiece group 3 and enters the human eye for imaging. The user can see the extended function information while observing the scene.
[0007] Although the above structures can realize the expansion of new functions based on the telephoto function, they have the following disadvantages:
[0008] 1. Inconvenient to use: For products with external display screens on the market, the extended function information cannot be seen when observing through the eyepiece. When observing the extended function information, it is necessary to shift the line of sight to the external display screen, which complicates the observation process and is inconvenient to use.
[0009] 2. Insufficient comfort: Products on the market with built-in displays have a display added to the telescope's unilateral optical path, making the left and right optical paths inconsistent, causing eye discomfort during observation.
[0010] 3. Poor image quality: Whether it is an external display screen or a built-in high-transmittance or LCD screen, it will cause a certain degree of scene distortion and affect the image quality. Summary of the invention
[0011] The purpose of the present invention is to provide a telescope augmented reality optical system in view of the defects of the prior art.
[0012] The specific technical solution adopted by the present invention is as follows: a telescope augmented reality optical system, which includes two optical path systems, one of which is a telescopic optical path for realizing the telescopic function; and the other optical path is an AR optical path for realizing the superimposed expansion function information.
[0013] A telescope augmented reality optical system as described above, wherein the real image positions of the telephoto optical path and the AR optical path are the same and are both located in front of the eyepiece.
[0014] A telescope augmented reality optical system as described above, wherein the telescopic optical path includes a telescopic objective lens group, a prism group, and an eyepiece group arranged in sequence along the optical path, and the real image position is located at the eyepiece image plane in front of the eyepiece group.
[0015] A telescope augmented reality optical system as described above, wherein the prism group is a Pechan prism group, including a roof prism and a half pentaprism, which is used to invert an object in the optical path into an erect image.
[0016] A telescope augmented reality optical system as described above, wherein the AR optical path includes a display screen for displaying extended function information, the scene on the display screen enters the half pentaprism through the refractor assembly, and enters the human eye through the eyepiece group, and the real image position is located at the eyepiece image plane in front of the eyepiece group.
[0017] A telescope augmented reality optical system as described above, wherein the refractor assembly includes a reflector 1, an entrance projection objective lens 1, a reflector 2, a projection objective lens 2, and a beam splitter prism arranged in sequence along the optical path, and the refractor assembly reduces its size by folding the optical path.
[0018] A telescope augmented reality optical system as described above, wherein the beam splitter prism is a part with a tetrahedral cross-section, the side of the beam splitter prism facing the semi-pentaprism is the bottom surface, the surface opposite to the bottom surface is the top surface, and the two side surfaces are the left side surface and the right side surface, respectively, wherein the angle between the top surface and the left side surface is 132°, the angle between the left side surface and the bottom surface is 66°, the angle between the bottom surface and the right side surface is 72°, and the angle between the right side surface and the top surface is 90°.
[0019] A telescope augmented reality optical system as described above, wherein a dichroic film coating is provided on the side of the half pentaprism facing the dichroic prism.
[0020] In the telescope augmented reality optical system as described above, the requirement for the dichroic film is to be selected according to the type of light to be displayed.
[0021] A telescope augmented reality optical system as described above, wherein an aperture is set between the second reflector and the second objective lens; the diagonal size of the display screen after being magnified by the first reflector, the first projection objective lens, and the second reflector is equal to the diameter of the aperture; the aperture is used to effectively reduce field curvature.
[0022] A telescope augmented reality optical system as described above, wherein the projection objective lens 1 adopts a double-cemented or aspherical lens.
[0023] A telescope augmented reality optical system as described above, wherein projection objective lens 1 is a glued projection objective lens 1, and the glued projection objective lens 1 and projection objective lens 2 adopt a symmetrical glued structure.
[0024] A telescope augmented reality optical system as described above, wherein the projection objective lens 1 is a free-form surface lens.
[0025] Compared with the prior art, the present invention has the following beneficial effects: the telescope AR optical system of the present invention is easy to use, comfortable to observe and has clearer imaging. The present invention projects the extended function information on the eyepiece image plane, superimposes it with the scene content, and then magnifies it together with the eyepiece group to enter the human eye image, so that the user can directly observe the distant scene and the extended function information in the eyepiece.
[0026] Specifically, it includes the following three points:
[0027] 1. The present invention is easy to use, and the extended function information can be seen while observing the scene;
[0028] 2. The present invention directly superimposes the display screen content onto the observed content by projection, and there will be no eye discomfort during observation;
[0029] 3. The present invention can make imaging clearer. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1a Schematic diagram of the built-in display structure;
[0031] Figure 1b Another structural diagram of the built-in display screen;
[0032] Figure 2 Schematic diagram of telescope optical path;
[0033] Figure 3 Schematic diagram of projection light path;
[0034] Figure 4 Schematic diagram of the position of the beam splitter film and the angle of the beam splitter prism;
[0035] Figure 5 Schematic diagram of projection light path;
[0036] Figure 6 Schematic diagram of the double-glued lens structure;
[0037] Figure 7 Schematic diagram of the free-form objective lens structure.
[0038] In the figure: 1—telephoto objective lens group; 2—prism group; 3—eyepiece group; 4—eyepiece mirror surface; 5—display screen; 6—beam splitter coating position; 21—roof prism; 22—half pentaprism; 23—display screen; 24—reflector one; 25—projection objective lens one; 25-1—cemented projection objective lens one; 25-2—replaced with free-form surface lens; 26—reflector two; 27—aperture; 28—projection objective lens two; 29—beam splitter prism. DETAILED DESCRIPTION
[0039] The present invention will be further described and illustrated below in conjunction with the accompanying drawings and specific implementation methods.
[0040] A telescope augmented reality optical system includes two optical path systems, one of which is a telescopic optical path to realize the telescopic function; and the other is an AR optical path to realize the superposition and expansion of functional information.
[0041] Telescope optical path (see Figure 2 ) consists of a telephoto objective lens group, a Behan prism group and an eyepiece group, wherein the number of lenses of the objective lens group and the eyepiece group is configured according to actual needs. In the telephoto optical path, the distant scene first passes through the telephoto objective lens group 1, and then is inverted into an erect image by the roof prism 21 and the half pentaprism 22 in the prism group 2, and then forms a real image at the eyepiece image plane 4, and finally enters the eye after being magnified by the eyepiece group 3.
[0042] The AR optical path consists of a display screen, two reflectors, two projection lenses, and a cemented prism (beam splitter prism 29 and half pentaprism 22). The extended function information on the display screen 23 is totally reflected by the reflector 1 24 and enters the projection lens 1 25. After being totally reflected by the reflector 2 26, it enters the projection lens 2 28 through the aperture 27. The optical path enters the beam splitter prism 29 vertically and passes through the beam splitter film 6 on the half pentaprism (see Figure 4 ) After being split, the light enters the semi-pentaprism 22 and finally forms a real image at the position of the eyepiece image plane 4, which is superimposed with the real image formed by the telephoto optical path, and then enters the eye together after being magnified by the eyepiece group 3 to form an image.
[0043] The beam splitter prism 29 is a part with a tetrahedral cross-section. The side of the beam splitter prism 29 facing the semi-pentaprism 22 is the bottom surface, the surface opposite to the bottom surface is the top surface, and the two side surfaces are the left side surface and the right side surface, respectively. The angle between the top surface and the left side surface is 132°, the angle between the left side surface and the bottom surface is 66°, the angle between the bottom surface and the right side surface is 72°, and the angle between the right side surface and the top surface is 90°.
[0044] In order to improve image quality and increase comfort, the present invention adopts the following main methods:
[0045] 1. The display screen position, size, and pixels are compatible with the AR optical system.
[0046] 1.1 Position: The display screen must be placed on the object side image plane at the front of the AR optical system;
[0047] 1.2 Size: The diagonal size of the display screen after being magnified by the reflector 1 24, the projection lens 1 25, and the reflector 2 26 is equal to the diameter of the aperture 27;
[0048] 1.3 Pixels: The pixel size of the display screen must match the resolution of the AR optical system. The matching method is to determine the resolution of the AR optical system by the pixel size according to the optical empirical formula. Example of the optical empirical formula: If the pixel size of the display screen is 4μmX4μm, then the resolution of the AR optical system is 1 / (2X4μm)=125LP / mm.
[0049] 2. Reduce field curvature, improve image quality and increase comfort.
[0050] 2.1 Add aperture. Add aperture 27 in the AR optical path, see above Figure 3 As shown, the field curvature can be effectively reduced.
[0051] 2.2 Use double-cemented or aspherical lenses. Using a conventional projection lens 25 will produce serious field curvature and poor image quality. Double-cemented or aspherical lenses can significantly solve the above problems.
[0052] 2.2.1 Double-gluing scheme: The single-piece projection objective lens 25 in the original structure is replaced with a glued projection objective lens 25-1. The structural diagram is shown below. Figure 5 The glued projection objective lens 1 25-1 and the projection objective lens 2 28 must adopt a symmetrical glued structure.
[0053] 2.2.2 Aspheric solution adopts free-form surface lens, replaces the cemented projection lens 25-1 with free-form surface lens 25-2, the structural diagram is shown in Figure 6 .
[0054] 3. The beam splitter prism 29 adopts a special angle, and its angle is shown in Figure 4 , in order to improve the transmittance and make the image clearer.
[0055] 4. Set the beam splitter 6, see Figure 4 , in order to increase transmittance and improve image quality.
[0056] 4.1 Beam splitting film. The light of a certain wavelength band is allowed to enter the semi-pentaprism 22, and the light of other wavelength bands is reflected, thereby reducing the influence of stray light. For example, for red light display: when the wavelength is 400-670nm, Tave≤1%; when the wavelength is 670-700nm, Tave≥95%.
[0057] In addition, the AR optical path can also adjust the position of the reflector 26 to arrange some components on the other side of the prism group 2 (see Figure 7 ) to meet different structural requirements. The remaining components are connected to the same side structure ( Figure 3 )same.
Claims
1. A telescope augmented reality optical system, characterized in that: It includes two optical path systems, one of which is the telephoto optical path, which is used to realize the telephoto function; the other is the AR optical path, which is used to realize the superimposition of extended function information.
2. A telescope augmented reality optical system as claimed in claim 1, characterized in that: The real image positions of the telephoto optical path and the AR optical path are the same and are both located in front of the eyepiece; the telephoto optical path comprises a telephoto objective lens group (1), a prism group (2), and an eyepiece group (3) which are sequentially arranged along the optical path, and the real image position is located at an eyepiece image plane (4) in front of the eyepiece group (3).
3. A telescope augmented reality optical system as claimed in claim 2, characterized in that: The prism group (2) is a Pechan prism group, comprising a roof prism (21) and a half pentaprism (22), and is used for inverting an object in the optical path into an erect image.
4. A telescope augmented reality optical system as claimed in claim 3, characterized in that: The AR optical path comprises a display screen (23) for displaying extended function information, the scene on the display screen (23) enters the semi-pentaprism (22) through a refractor assembly, and enters the human eye through an eyepiece assembly (3), and the real image position is located at an eyepiece image plane (4) in front of the eyepiece assembly (3).
5. A telescope augmented reality optical system as claimed in claim 4, characterized in that: The refractor assembly comprises a reflector 1 (24), an entry projection objective lens 1 (25), a reflector 2 (26), a projection objective lens 2 (28), and a beam splitter prism (29) which are sequentially arranged along the optical path. The refractor assembly is reduced in size by folding the optical path.
6. A telescope augmented reality optical system as claimed in claim 5, characterized in that: The beam splitter prism (29) is a tetrahedral part in cross section. The side of the beam splitter prism (29) facing the semi-pentaprism (22) is the bottom surface, the side opposite to the bottom surface is the top surface, and the two side surfaces are the left side surface and the right side surface, wherein the angle between the top surface and the left side surface is 132°, the angle between the left side surface and the bottom surface is 66°, the angle between the bottom surface and the right side surface is 72°, and the angle between the right side surface and the top surface is 90°.
7. A telescope augmented reality optical system as claimed in claim 6, characterized in that: A dichroic film coating is arranged on the side of the half pentaprism (22) facing the dichroic prism (29); the dichroic film is selected according to the type of light to be displayed.
8. A telescope augmented reality optical system as claimed in claim 7, characterized in that: An aperture (27) is arranged between the second reflector (26) and the second objective lens (28); the diagonal size of the display screen after being magnified by the first reflector (24), the first projection objective lens (25) and the second reflector (26) is equal to the diameter of the aperture (27); the aperture (27) is used to effectively reduce field curvature.
9. A telescope augmented reality optical system as claimed in claim 8, characterized in that: The projection objective lens 1 (25) adopts double cemented or aspherical lens.
10. A telescope augmented reality optical system as claimed in claim 9, characterized in that: The projection objective lens 1 (25) is a glued projection objective lens 1 (25-1), and the glued projection objective lens 1 (25-1) and the projection objective lens 2 (28) adopt a symmetrical glued structure.
11. A telescope augmented reality optical system as claimed in claim 10, characterized in that: The projection objective lens 1 (25) is a free-form surface lens (25-2).