An optical system with adjustable imaging size
By adjusting the position of the lens group in the optical system through the lens adjustment mechanism, the problem of adjusting the imaging size of the optical system is solved, and personalized imaging adaptation and stability are achieved, which is applicable to the field of optical imaging.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGRAO GUANGRUI TECHNOLOGY CO LTD
- Filing Date
- 2025-09-16
- Publication Date
- 2026-07-07
AI Technical Summary
Existing optical systems are difficult to adjust the imaging size flexibly to meet the personalized needs of different viewers, and the high positional stability requirements of optical components affect the imaging effect.
By setting up a lens adjustment mechanism, including multiple lens groups and a rotating rod, the lens groups are allowed to move and rotate in the accommodating space, adjusting the optical path to change the imaging size and maintaining the stability of the optical system.
It enables flexible adjustment of the image size without changing the light source imaging size, adapting to the needs of different viewers and maintaining clear and stable imaging.
Smart Images
Figure CN224471889U_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of optical imaging, and more specifically relates to an optical system with adjustable imaging size. Background Technology
[0002] In existing technologies, viewing a magnified image typically involves directly magnifying the image displayed by the light source. For example, with electronic devices like mobile phones, the screen can be manually magnified. However, for optical systems based on telephoto imaging, the precision of these systems is usually high, and the positions of each optical component must remain stable and fixed; even slight misalignments can affect the final image. Therefore, directly intervening in the optical system for magnification adjustment, such as by magnifying a mobile phone screen, is not feasible. Furthermore, the image size needs to be adjusted to meet the different needs of different viewers, making telephoto imaging optical systems flexible and customizable to meet individual requirements. Utility Model Content
[0003] This invention is proposed based on the above-mentioned needs of the prior art. The technical problem to be solved by this invention is to provide an optical system with adjustable imaging size to personalize the imaging size.
[0004] To solve the above problems, the technical solution provided by this utility model includes:
[0005] An optical system with adjustable imaging size is provided, comprising: a light source for emitting light; a reflective surface disposed opposite to the light source to receive the light emitted from the light source, wherein an accommodating space is formed between the light source and the reflective surface; a lens adjustment mechanism including multiple lens groups, each lens group having a different focal length; the multiple lens groups moving between a first position and a second position, wherein when any lens group is in the first position, the lens group is housed within the accommodating space; and when any lens group is in the second position, the lens group is located outside the accommodating space; light emitted from the light source passes through the lens groups in the accommodating space and then enters the reflective surface; a preset lens group disposed opposite to the reflective surface, wherein light reflected by the reflective surface enters the preset lens group and, after refraction, forms a virtual image with a focal depth greater than 3m at the exit pupil position; the smaller the focal length of the lens groups in the accommodating space among the multiple lens groups, the larger the size of the ultimately formed virtual image.
[0006] By setting up a lens adjustment mechanism to adjust the lens group involved in forming the light path, the size of the image can be adjusted according to the viewer's needs. While keeping the content displayed on the monitor unchanged, the magnification of the image can be changed, thereby ensuring image clarity and stability. A accommodating space can be provided to accommodate different lens groups and maintain the stability of the entire optical system.
[0007] Preferably, the optical system with adjustable imaging size includes a prism, the accommodating space is formed by the light source and the prism, and the reflecting surface is disposed on the second surface of the prism.
[0008] By fixing the reflective surface as described above, the optical system can maintain stable imaging.
[0009] Preferably, the plane containing the reflecting surface forms a 45° angle with the axial direction of the lens group placed in the accommodating space.
[0010] Preferably, the lens adjustment mechanism includes a rotating rod, and multiple lens groups are disposed on the rotating rod. When the rotating rod rotates, the multiple lens groups rotate circumferentially around the rotating rod, changing the lens groups accommodated in the receiving space.
[0011] The above method allows each lens group to rotate into the accommodating space, thereby achieving different degrees of magnification of the light source.
[0012] Preferably, the lens adjustment mechanism includes a first lens group and a second lens group, the focal length of the first lens group is smaller than the focal length of the second lens group, the first position and the second position are located on opposite sides of the rotating rod, and the virtual image size formed by the first lens group in the accommodating space is larger than the virtual image size formed by the second lens group in the accommodating space.
[0013] Preferably, when the first lens group is placed in the accommodating space, the focal length of the optical system is less than or equal to 58 mm; when the second lens group is placed in the accommodating space, the focal length of the optical system is greater than or equal to 67 mm.
[0014] Preferably, the rotating rod is provided with a plurality of support frames corresponding to the lens group, the support frames are in the shape of a ring, and the lens group is nested into the ring formed by the support frames.
[0015] The lens assembly is fixed to the rotating rod by a support frame so that it can be rotated stably into the receiving space.
[0016] Preferably, the prism includes a first surface, the plane of which the first surface is located is parallel to the plane of which the light-emitting surface of the light source is located, and the first surface and the light-emitting surface of the light source form an accommodating space.
[0017] Preferably, the exit pupil of the optical system with adjustable imaging size is greater than or equal to 70mm × 50mm.
[0018] Preferably, the prism includes a third surface that abuts against a lens in the preset lens group, and the plane containing the third surface forms a 45° angle with the plane containing the reflecting surface.
[0019] Compared with existing technologies, this invention, without changing the basic optical path or the imaging size of the light source, adjusts the lens group suitable for the viewer by placing it in the accommodating space through a lens adjustment mechanism. This allows the lens group to participate in the formation of the optical path, thereby adjusting the final image size of the optical system. The lens adjustment mechanism facilitates easy adjustment of the lens group's position, allowing for personalized and targeted adaptation to different viewers, and enabling flexible adjustments. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings.
[0021] Figure 1 This is a schematic diagram of the structure when the first lens group participates in the propagation of light from the light source in an embodiment of this utility model;
[0022] Figure 2 This is a schematic diagram of the structure when the second lens group participates in the propagation of light from the light source in an embodiment of this utility model;
[0023] Figure 3 This is a schematic diagram of the structure of the first optical path in an embodiment of this utility model;
[0024] Figure 4 This is a schematic diagram of the structure of the second optical path in an embodiment of this utility model;
[0025] Figure 5 This is a field curve diagram of the first optical path in an embodiment of the present invention;
[0026] Figure 6 This is a schematic diagram of the distortion rate under the first optical path in the embodiment of this utility model;
[0027] Figure 7 This is a field curve diagram of the second optical path in an embodiment of this utility model;
[0028] Figure 8 This is a schematic diagram of the distortion rate under the second optical path in an embodiment of this utility model.
[0029] Figure label:
[0030] 1. Exit pupil; 2. Preset lens group; 3. Reflecting surface; 4. First lens group; 5. Second lens group; 6. Light source; 7. Rotating rod; 8. Prism. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0032] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "connected" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0033] Throughout the text, the terms “top,” “bottom,” “above,” “below,” and “on top” refer to the relative positions of components of the device, such as the relative positions of the top and bottom substrates within the device. It is understood that the device is multifunctional and independent of its spatial orientation.
[0034] To facilitate understanding of the embodiments of this application, the following will provide further explanation and description with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this application.
[0035] This embodiment provides an optical system with adjustable imaging size (hereinafter referred to as the optical system), such as Figures 1-8 As shown.
[0036] like Figure 1 and Figure 2 As shown, the optical system with adjustable imaging size includes a light source 6, a lens adjustment mechanism, a reflective surface 3, and a preset lens group 2.
[0037] Light source 6 emits light to provide a light source for the optical system. Light source 6 can be an image display screen.
[0038] A reflective surface 3 is positioned opposite to and at a certain distance from the light source 6. Light emitted from the light source 6 is incident on the reflective surface 3 and reflected. A space is formed between the reflective surface 3 and the light source 6.
[0039] The reflecting surface 3 can be fixed in the form of a mirror or as a surface of the prism 8. Since the optical system requires precise imaging, even small changes or displacements will have a significant impact on the final image. Therefore, the constructed optical system needs stability. In this embodiment, the optical system also includes a prism 8, which includes a first surface, a second surface, and a third surface. The first surface is positioned opposite the light source 6, forming a semi-enclosed space between the first surface and the emitting surface of the light source 6. This space is used to accommodate the lens adjustment mechanism, providing a relatively stable space for it. Further, the first surface is parallel to the surface of the light source 6. A reflective film is coated on the second surface to form the reflecting surface 3. The second surface is set at a certain angle to the surface of the light source 6 to change the direction of light propagation. Further, the second surface has a 45° angle with the emitting surface of the light source 6. The light reflected by the mirror passes through the third surface and exits. The light emitted by the light source propagates through the first, second, and third surfaces sequentially within the prism.
[0040] A lens adjustment mechanism is disposed opposite to the light source 6. The lens adjustment mechanism includes multiple lens groups, each with a different focal length; the multiple lens groups move between a first position and a second position, and when any lens group is in the first position, it is housed within the receiving space; when any lens group is in the second position, it is outside the receiving space.
[0041] Furthermore, the lens adjustment mechanism includes a rotating rod 7, and the multiple lens groups are mounted on the rotating rod 7, rotating circumferentially around the rotating rod 7.
[0042] The rotating rod 7 extends along a first direction, and multiple lens groups extend on a plane intersecting the first direction. The rotating rod 7 is connected to the multiple lens groups. The rotating rod 7 is provided with multiple support frames, the plane of which intersects the first direction, and the support frames are annular, with the lens groups nested within the annulus formed by the support frames.
[0043] The support frame is fixed in a limiting position by a limiting mechanism. The limiting mechanism is flexibly arranged according to the spatial structure in which the optical system is located. When the support frame is in the limiting position, the lens group in the support frame is opposite to the light source 6, so that the light emitted by the light source 6 is processed by the lens group.
[0044] By rotating the rotating rod 7, one group of lenses is positioned opposite the light source 6, thereby processing the light. During the rotation of multiple lens groups, any lens group can rotate into the accommodating space formed between the light source 6 and the prism 8, meaning any lens group is adapted to the accommodating space. When the lens group enters the accommodating space, the light source 6 and the prism 8 are located on opposite sides of the lens group. The light emitted from the light source 6 enters the lens group, is refracted, and then reflects off the reflecting surface 3 of the prism 8.
[0045] The number of lens groups is related to the shape of each lens group, and adjacent lens groups are either tangent or separate.
[0046] The multiple lens groups each have a different focal length. The lens groups forming the optical path are adjusted according to the required image size. When a larger image size is required, this is achieved by decreasing the focal length of the optical system, that is, rotating the lens group with the smaller focal length into the receiving space; when a smaller image size is required, this is achieved by increasing the focal length of the optical system, that is, rotating the lens group with the larger focal length into the receiving space. The lens adjustment mechanism provides the user with multiple options to adjust the lens group entering the receiving space according to needs, thereby changing the focal length of the entire optical system and affecting the image size.
[0047] A preset lens group 2 is disposed opposite to the reflecting surface 3, so that light reflected by the reflecting surface 3 can enter the preset lens group 2. Furthermore, the axis of the preset lens group 2 is perpendicular to the third surface, and the surface of one lens in the preset lens group 2 is in contact with the third surface to further improve the stability of the optical system.
[0048] The light emitted from the preset lens group 2 will be projected towards the exit pupil 1 to form a virtual image with a preset focal depth. The preset focal depth is greater than or equal to 3m.
[0049] In one feasible embodiment, the lens adjustment mechanism includes two lens groups: a first lens group 4 and a second lens group 5. The first lens group 4 and the second lens group 5 are located on opposite sides of the rotating rod 7. The focal length of the first lens group 4 is smaller than the focal length of the second lens group 5, such that when light emitted from the light source 6 passes through the first lens group 4, the size of the virtual image output by the optical system is larger than the size of the virtual image formed when light from the light source 6 passes through the second lens group 5. Furthermore, when the first lens group 4 participates in the light path formation, the focal length of the optical system is less than or equal to 58 mm; when the second lens group 5 participates in the light path formation, the focal length of the optical system is greater than or equal to 67 mm.
[0050] The exit pupil 1 of the virtual image output by the optical system is not less than 70mm × 50mm, and the distortion rate is less than or equal to 3%.
[0051] The following will provide a feasible specific implementation method, such as... Figure 3 As shown, Table 1 will give the optical parameters of the optical path when the first lens group 4 participates in forming the first optical path. The system field of view formed based on this optical path is 48°, the diameter of the exit pupil 1 is 70mm×50mm, the focal plane depth of the virtual image is 3m, and the diagonal size of the virtual image is 105 inches.
[0052] Table 1 Parameters of the First Optical Path System
[0053]
[0054]
[0055] The surface numbering references in Table 1 Figure 3 The middle finger represents the specific optical surface. Specifically, 100 is the virtual image formed based on the first optical path, 101 is the exit pupil 1, 111, 112, 113, 114, 115, 116 and 117 are the various surfaces of the lenses in the preset lens group 2; 121 is the third surface; 122 is the second surface; 123 is the first surface; 131, 132, 133 and 134 are the various surfaces of the first lens group 4; 151 and 152 are the two surfaces of the light source 6.
[0056] Of the surfaces mentioned above, the surfaces that make up the sphere satisfy the following equation: c is the reciprocal of the radius of curvature, and r is the radial distance from a point on the surface. The surface constituting an aspherical surface satisfies the equation: c is the reciprocal of the radius of curvature, r is the radial distance from a point on the surface, k is the quadratic surface constant, and A i These are the coefficients of higher-order terms.
[0057] like Figure 4 As shown, this is the optical path system in which the second lens group 5 participates in forming the optical path. Table 2 will give the optical path optical parameters corresponding to the first lens group 4 participating in forming the second optical path. The system field of view formed based on this optical path is 40°, the exit pupil 1 diameter is 70mm×50mm, the virtual image focal plane depth is 3m, and the diagonal size of the virtual image is 86 inches.
[0058] Table 2 Parameters of the Second Optical Path System
[0059]
[0060]
[0061] The surface numbering references in Table 2 Figure 4The middle finger represents the specific optical surface. 200 is the virtual image formed based on the first optical path, 101 is the exit pupil 1, 111, 112, 113, 114, 115, 116 and 117 are the various surfaces of the lenses in the preset lens group 2; 121 is the third surface; 122 is the second surface; 123 is the first surface; 161, 162, 163 and 164 are the various surfaces of the second lens group 5; 151 and 152 are the two surfaces of the light source 6.
[0062] Table 3 will give the corresponding aspherical coefficients from Tables 1 and 2.
[0063] Table 3 Aspherical coefficients
[0064]
[0065]
[0066] In the optical path formed above, the reflecting surface 3 corresponds to surface number 122. This optical surface is eccentric and has an Alpha tilt angle of 45 degrees. Apart from this, the other optical surfaces are not eccentric and do not have an Alpha tilt angle.
[0067] The field curvature formed by the first optical path is as follows: Figure 5 As shown, X and Y represent the sagittal and meridional directions, respectively, and 1, 2, and 3 represent wavelengths of 630nm, 525nm, and 460nm, respectively. The maximum field curvature in the first optical path is less than 0.8mm, indicating that the optical system has good imaging quality. The distortion curve is shown in the figure. Figure 6 As shown, the distortion values for light wavelengths of 630nm, 525nm, and 460nm are all less than 3%, indicating that the formed optical system has good imaging quality. The field curvature curve formed by the second optical path is shown in the figure. Figure 7 As shown, X and Y represent the sagittal and meridional directions, respectively, and 1, 2, and 3 represent wavelengths of 630nm, 525nm, and 460nm, respectively. The maximum field curvature in the second optical path is less than 0.8mm, indicating that the optical system has good imaging quality. The distortion curve is shown in the figure. Figure 8 As shown, the distortion values for light with wavelengths of 630nm, 525nm, and 460nm are all less than 3%, indicating that the formed optical system has good imaging quality.
[0068] Based on the viewer's visual habits and needs, the lens adjustment mechanism selects a lens group with an appropriate focal length to participate in the formation of the light path, thereby adjusting the size of the final virtual image formed by the optical system to personalize and specifically suit different viewers, allowing for flexible adjustments.
[0069] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. An optical system with adjustable imaging size, characterized in that, include: A light source, which emits light; A reflective surface is disposed opposite to the light source to receive light emitted from the light source, and an accommodating space is formed between the light source and the reflective surface; The lens adjustment mechanism includes multiple lens groups, each with a different focal length. Multiple lens groups move between a first position and a second position, and when any one lens group is in the first position, the lens group is housed in the receiving space; When any one of the lens groups is in the second position, the lens group is outside the accommodating space; The light emitted by the light source passes through the lens group in the accommodating space and then enters the reflecting surface; A preset lens group is set opposite to the reflecting surface. Light reflected by the reflecting surface is incident on the preset lens group and, after refraction, forms a virtual image with a focal plane depth greater than 3m at the exit pupil position. The smaller the focal length of the lens group in the accommodating space is among the multiple lens groups, the larger the size of the final virtual image formed.
2. The optical system with adjustable imaging size according to claim 1, characterized in that, The optical system with adjustable imaging size includes a prism, the accommodating space is formed by the light source and the prism, and the reflecting surface is disposed on the second surface of the prism.
3. The optical system with adjustable imaging size according to claim 1 or 2, characterized in that, The plane containing the reflecting surface forms a 45° angle with the axial direction of the lens group placed in the accommodating space.
4. The optical system with adjustable imaging size according to claim 3, characterized in that, The lens adjustment mechanism includes a rotating rod, and multiple lens groups are disposed on the rotating rod. When the rotating rod rotates, the multiple lens groups rotate circumferentially around the rotating rod, changing the lens groups accommodated in the receiving space.
5. The optical system with adjustable imaging size according to claim 4, characterized in that, The lens adjustment mechanism includes a first lens group and a second lens group. The focal length of the first lens group is smaller than that of the second lens group. The first position and the second position are located on opposite sides of the rotating rod. The virtual image size formed by the first lens group in the accommodating space is larger than that formed by the second lens group in the accommodating space.
6. The optical system with adjustable imaging size according to claim 5, characterized in that, When the first lens group is placed in the accommodating space, the focal length of the optical system is less than or equal to 58 mm; when the second lens group is placed in the accommodating space, the focal length of the optical system is greater than or equal to 67 mm.
7. The optical system with adjustable imaging size according to claim 4, characterized in that, The rotating rod is provided with multiple support frames corresponding to the lens group. The support frames are in the shape of a ring, and the lens group is nested into the ring formed by the support frames.
8. The optical system with adjustable imaging size according to claim 2, characterized in that, The prism includes a first surface, the plane of which is located is parallel to the plane of which the light-emitting surface of the light source is located, and the first surface and the light-emitting surface of the light source form an accommodating space.
9. The optical system with adjustable imaging size according to claim 1, characterized in that, The exit pupil of an optical system with adjustable imaging size is greater than or equal to 70mm × 50mm.
10. The optical system with adjustable imaging size according to claim 2, characterized in that, The prism includes a third surface that abuts against a lens in the preset lens group, and the plane containing the third surface forms a 45° angle with the plane containing the reflecting surface.