Optical module with adjustable diopter and optical system
By designing a diopter adjustable optical module including a display unit, an optical imaging assembly and a diopter adjustment assembly, the problems of incomplete viewing and large refractive light blocking in the prior art when adjusting the diopter are solved, and more flexible and accurate diopter adjustment is achieved.
Patent Information
- Application Number
- CN202422063491.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-23
AI Technical Summary
When the existing AR module adjusts the diopter to 0D, the human eye cannot see all the contents on the screen completely and clearly, and large refractive light blocking is prone to occur when increasing the myopia diopter.
A diopter adjustable optical module is designed, including a display unit, an optical imaging assembly and a diopter adjustment assembly. The first driving member simultaneously drives the display unit and the lens assembly to move, adjusts to the intermediate diopter, and only drives the display unit to continue moving through the second driving member, reducing the spacing between the display unit and the optical imaging assembly, and achieving adjustment of the target diopter.
It effectively avoids the incomplete viewing problem when adjusting the diopter to 0D, shortens the adjustment stroke, avoids the phenomenon of large refractive light blocking, and improves the imaging quality of the optical module and the flexibility of the diopter adjustment.
Smart Images
Figure CN222939333U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of display technology, in particular to an optical module and an optical system with adjustable diopter. Background Art
[0002] In the existing AR module, the diopter adjustment method is mainly screen movement or the movement of the screen and the lens assembly together. However, just moving the screen to adjust the diopter, when adjusting the diopter to 0D (i.e., the orthoscopic state), since the relative distance between the screen and the lens assembly is too far, the human eye cannot completely and clearly see all the content on the screen. And if the screen and the lens assembly are moved together as a whole to adjust the diopter, the overall movement stroke is relatively long, and when trying to increase the myopic diopter, there will be a large diopter light blocking phenomenon. Therefore, it is necessary to improve the existing technology.
[0003] The above information is given as background information only to assist in understanding the present disclosure, and it is not determined or admitted whether any of the above content can be used as the prior art relative to the present disclosure. Summary of the Utility Model
[0004] The utility model provides an optical module and an optical system with adjustable diopter to solve the problems existing in the prior art.
[0005] To achieve the above object, the utility model provides the following technical solutions:
[0006] An optical module with adjustable diopter, comprising:
[0007] A display unit for providing a display image;
[0008] An optical imaging component for imaging the display image, including a lens component and a first optical structure arranged in sequence along the light-emitting direction of the display unit. The first optical structure is inclined, and a second optical structure is provided on the reflection optical path of the first optical structure;
[0009] A diopter adjustment component, including a first driving member drivingly connected to the display unit and the lens component, and a second driving member drivingly connected to the display unit;
[0010] The first driving member at least simultaneously drives the display unit and the lens component to move until the intermediate diopter is adjusted;
[0011] The second driving member is used to only drive the display unit to continue moving when the intermediate diopter is adjusted, so as to reduce the distance between the display unit and the optical imaging until the target diopter is adjusted;
[0012] The distance L between the central position on the side close to the human eye of the first optical structure and the light-emitting surface of the display unit, the moving stroke of the overall movement of the display unit and the lens assembly is Δd, and the variable range of the back focal length of the optical module with adjustable diopter is ΔT. The optical module with adjustable diopter satisfies the following conditions:
[0013] 0.23 > (Δd + ΔT) / L > 0.1.
[0014] Optionally, the exit pupil diameter of the optical module with adjustable diopter is EB, and the aperture of the lens assembly of the optical module with adjustable diopter is D. The optical module with adjustable diopter satisfies the following conditions:
[0015] 0.4 < EB / D < 0.67.
[0016] Optionally, the sagittal height of the second optical structure is S1, and the air gap between the central position of the second optical structure and the central position of the first optical structure is T1. The optical module with adjustable diopter satisfies the following conditions:
[0017] 1.2 > S1 / T1 > 0.2.
[0018] Optionally, the variable range of the back focal length ΔT of the optical module with adjustable diopter has a value range of 0 to 2 mm.
[0019] Optionally, the moving stroke Δd when the display unit and the lens assembly move as a whole has a value range of 0 to 4 mm.
[0020] Optionally, the value of the distance L between the central position on the side close to the human eye of the first optical structure and the light-emitting surface of the display unit is L < 26 mm.
[0021] Optionally, the back focal length of the optical module with adjustable diopter is 0.7 to 1.5 mm.
[0022] Optionally, the change amount of the focal length of the optical module with adjustable diopter is ΔEFL, and the moving stroke of the overall movement of the display unit and the lens assembly is Δd. The optical module with adjustable diopter satisfies the following conditions:
[0023] 4 > ΔEFL / Δd > 0.5.
[0024] Optionally, the incident angle of the maximum field of view on the display unit is RAD1, and the incident angle of the central field of view on the display unit is RAD. The optical module with adjustable diopter satisfies the following conditions:
[0025] 1 > RAD1 / RAD > 0.4.
[0026] The present utility model further provides an optical system with adjustable diopter, including the optical module with adjustable diopter described in any one of the above.
[0027] Compared with the prior art, the present utility model has the following beneficial effects:
[0028] For the optical module and the optical system with adjustable diopter provided by the present utility model, by setting a first driving member drivingly connected to the display unit and the lens assembly, and a second driving member drivingly connected to the display unit, the purpose of segmented adjustment is achieved; in addition, by reasonably defining the moving stroke of the optical imaging assembly and the variable range of the back focal length of the optical module, the problem of incomplete viewing in the orthoscopic state with the diopter adjusted to 0D is effectively avoided, and at the same time, the adjustment stroke is shortened, and the phenomenon of large diopter light blocking is avoided.
[0029] The present utility model has other characteristics and advantages, which will be obvious from the accompanying drawings incorporated herein and the subsequent specific embodiments, or will be described in detail in the accompanying drawings incorporated herein and the subsequent specific embodiments. These accompanying drawings and specific embodiments are jointly used to explain the specific principles of the present utility model. Description of the Drawings
[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0031] Figure 1 It is a schematic structural diagram of an optical module with adjustable diopter provided in Embodiment 1 of the present utility model.
[0032] Reference numerals: 10, display unit; 21, lens assembly; 22, first optical structure; 23, second optical structure; 24, human eye; 31, first driving member; 32, second driving member. Detailed Embodiments
[0033] To describe in detail the possible application scenarios, technical principles, implementable specific solutions, achievable purposes and effects, etc. of the present application, the following will be described in detail in combination with the specific embodiments listed and the accompanying drawings. The embodiments recorded herein are only used to more clearly illustrate the technical solutions of the present application, so they are only examples and cannot be used to limit the protection scope of the present application.
[0034] Reference to "embodiment" in this application means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.
[0035] Unless otherwise defined, the meanings of the technical terms used in this application are the same as those commonly understood by those skilled in the technical field to which this application belongs; the use of the relevant terms in this application is only for describing specific embodiments and is not intended to limit this application.
[0036] In the description of this application, the phrase "and / or" is an expression used to describe the logical relationship between objects, indicating that there can be three relationships, for example, A and / or B, which means: there is A, there is B, and there is both A and B at the same time. In addition, the character " / " in this application generally represents an "or" logical relationship between the associated objects before and after.
[0037] In this application, terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantitative, primary or secondary, or sequential relationships between these entities or operations.
[0038] Without further limitation, in this application, the use of "comprising", "including", "having" or other similar expressions in a statement is intended to cover non-exclusive inclusion. These expressions do not exclude the possibility that there may be additional elements in the process, method or product including the said elements, so that a process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.
[0039] The same as the understanding in the "Examination Guidelines", in this application, expressions such as "greater than", "less than", "exceeding" are understood not to include the number itself; expressions such as "above", "below", "within" are understood to include the number itself. In addition, in the description of the embodiments of this application, the meaning of "a plurality of" is two or more (including two), and similar expressions related to "many" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise specifically defined.
[0040] In the description of the embodiments of the present application, the spatially related expressions used, such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "perpendicular", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the specific embodiment or the accompanying drawings. It is only for the convenience of describing the specific embodiments of the present application or for the reader's understanding, rather than indicating or implying that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.
[0041] Unless otherwise clearly specified or limited, in the description of the embodiments of the present application, the terms such as "installed", "connected", "connected", "fixed", "set", etc. should be understood in a broad sense. For example, the "connection" may be a fixed connection, a detachable connection, or an integral setting; it may be a mechanical connection, an electrical connection, or a communication connection; it may be directly connected, or indirectly connected through an intermediate medium; it may be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art to which the present application pertains, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.
[0042] To solve the problems existing in the prior art, the present utility model proposes an optical module and an optical system with adjustable diopter. The following introduces the solution of the present utility model with reference to the accompanying drawings.
[0043] Please refer to Figure 1 , the present utility model provides an optical module with adjustable diopter, including a display unit 10 for providing a display image and an optical imaging component for imaging the display image.
[0044] The optical imaging component includes a lens assembly 21 disposed on the light-emitting optical path of the display unit 10, a first optical structure 22 disposed obliquely on the transmitted optical path of the lens assembly 21, and a second optical structure 23 disposed on the reflected optical path of the first optical structure 22. Through the combination and synergistic effect of these optical structures, effective imaging and transmission of the display image are achieved.
[0045] The optical module with adjustable diopter further includes a diopter adjustment component, and the diopter adjustment component includes a first driving member 31 drivingly connected to the display unit 10 and the lens assembly 21, and a second driving member 32 drivingly connected only to the display unit 10
[0046] Among them, it can be understood that the lens assembly 21 is used to converge light, the inclined setting of the first optical structure 22 is used to change the propagation direction of light, and the second optical structure 23 is used to process the reflected light.
[0047] Specifically, the first driving member 31 can drive the display unit 10 and the lens assembly 21 to move simultaneously, so as to adjust the diopter to the intermediate diopter. The first driving member 31 initially changes the relative positions of the two by cooperatively moving the display unit 10 and the lens assembly 21, thereby achieving the initial adjustment of the diopter.
[0048] Among them, the first driving member 31 drives at least the display unit 10 and the lens assembly 21 to move simultaneously.
[0049] For example, when the first driving member 31 is started, it will drive the display unit 10 and the lens assembly 21 to move together, causing the original imaging state to change, so as to achieve the purpose of adjusting the diopter of the optical module to the intermediate diopter; after the diopter of the optical module reaches the intermediate diopter, the second driving member 32 only drives the display unit 10 to continue to move to reduce the distance between the display unit 10 and the optical imaging assembly until it is adjusted to the target diopter. It can be understood that by moving the display unit 10 alone to further fine-tune the distance between the two, more accurate diopter adjustment can be achieved. Exemplarily, after the first driving member 31 completes the initial adjustment, the second driving member 32 is started to precisely control the position of the display unit 10, so that the diopter reaches the target value required by the user, which can achieve more refined and personalized diopter adjustment and meet the needs of different users.
[0050] Specifically, the distance between the center position of the first optical structure 22 on the side close to the human eye 24 and the light-emitting surface of the display unit 10 is L, the moving stroke of the display unit 10 and the lens assembly 21 moving as a whole is Δd, and the variable range of the back focal length of the diopter-adjustable optical module is ΔT. The diopter-adjustable optical module satisfies the condition of 0.23 > (Δd + ΔT) / L > 0.1.
[0051] Based on the foregoing relationship, it can be ensured that the imaging quality of the module will not be affected too much when adjusting the diopter, and at the same time, a relatively wide diopter adjustment range can be achieved to ensure the performance and stability of the optical module during the diopter adjustment process.
[0052] Furthermore, the exit pupil diameter of the diopter-adjustable optical module is EB (eyebox), the aperture of the lens assembly of the diopter-adjustable optical module is D, and the diopter-adjustable optical module satisfies the condition of 0.4 < EB / D < 0.67.
[0053] When the above - mentioned relational expressions are satisfied, by reasonably limiting the ratio of the exit pupil diameter to the aperture of the lens assembly, the comfort and visual effect of the user during use are ensured; if the ratio of EB / D is too small, it may cause discomfort to the user when wearing; if the ratio of EB / D is large, it may affect the field of view.
[0054] Further, the sagittal height of the second optical structure 23 is S1, the air gap between the center position of the second optical structure 23 and the center position of the first optical structure 22 is T1, and the diopter - adjustable optical module satisfies the condition of 1.2 > S1 / T1 > 0.2.
[0055] When the above - mentioned relational expressions are satisfied, the clarity of imaging can be improved, and the optical path and imaging performance of the optical module can be optimized.
[0056] Further, the variable range of the back focal length of the diopter - adjustable optical module is such that the value range of ΔT is 0 - 2 mm, and the value range of the moving stroke Δd when the display unit 10 and the lens assembly 21 move as a whole is 0 - 4 mm; the value of the distance L between the center position on the side of the first optical structure 22 close to the human eye 24 and the light - emitting surface of the display unit 10 is L < 26 mm.
[0057] By limiting the value ranges of ΔT, Δd, and L, the performance and stability of the optical module in different diopter adjustment states are ensured, so that appropriate parameter values can be selected according to the user's vision condition and usage requirements to achieve the best imaging effect.
[0058] Further, the back focal length of the diopter - adjustable optical module is 0.7 - 1.5 mm.
[0059] Preferably, in an optical system structure, the maximum value of the back focal length of the diopter - adjustable optical module is 1.5 mm, and the optional value is 0.7 mm. It can be understood that the maximum back focal length of 1.5 mm can cover a wide range of vision correction, and whether it is mild myopia or more serious vision problems, effective correction can be achieved through this optical module to expand the target audience of the product. When the back focal length is 0.7 mm, a clear and comfortable visual experience can be provided for most users.
[0060] In addition, the above - mentioned limitation of the back focal length value can make the light better focus on the retina, reduce aberration and blur, and make the image sharper and more vivid.
[0061] Further, the change amount of the focal length of the diopter - adjustable optical module is ΔEFL, the moving stroke when the display unit 10 and the lens assembly 21 move as a whole is Δd, and the diopter - adjustable optical module satisfies the condition of 4 > ΔEFL / Δd > 0.5.
[0062] When the foregoing relational expression is satisfied, by reasonably limiting the ratio of the focal length variation to the moving stroke, more accurate and stable diopter adjustment is achieved. At the same time, it can ensure that the change in the focal length conforms to the actual requirements when the moving stroke changes, thereby improving the accuracy of diopter adjustment.
[0063] Further, the incident angle of the maximum field of view on the display unit 10 is RAD1, and the incident angle of the central field of view on the display unit 10 is RAD. The diopter-adjustable optical module satisfies the condition of 1 > RAD1 / RAD > 0.4.
[0064] When the foregoing relational expression is satisfied, by reasonably limiting the ratio of the incident angles of different fields of view, the imaging quality and consistency of the optical module under different fields of view are ensured, the distortion and chromatic aberration of the edge field of view are reduced, and the imaging effect within the entire field of view is improved.
[0065] Embodiment 1
[0066] An embodiment of the present utility model provides a diopter-adjustable optical module, which includes a display unit 10 for providing a display image, an optical imaging component for imaging the display image, and further includes a diopter adjustment component. The diopter adjustment component includes a first driving member 31 drivingly connected to the display unit 10 and the lens assembly 21, and a second driving member 32 drivingly connected only to the display unit 10.
[0067] In this embodiment, the optical imaging component includes a lens assembly 21 disposed on the light exit path of the display unit 10, a first optical structure 22 disposed obliquely on the transmitted light path of the lens assembly 21, and a second optical structure 23 disposed on the reflected light path of the first optical structure 22. Through the combination and cooperation of these optical structures, effective imaging and transmission of the display image are achieved.
[0068] Among them, it can be understood that the lens assembly 21 is used to converge light, the oblique setting of the first optical structure 22 is used to change the propagation direction of light, and the second optical structure 23 is used to process the reflected light.
[0069] Specifically, the first driving member 31 can drive the display unit 10 and the lens assembly 21 to move simultaneously, so as to adjust the diopter to the intermediate diopter. The first driving member 31 initially changes the relative positions of the two by cooperatively moving the display unit 10 and the lens assembly 21, thereby achieving the initial adjustment of the diopter.
[0070] In this embodiment, the first driving member 31 drives at least the display unit 10 and the lens assembly 21 to move simultaneously.
[0071] In the first embodiment, the conditions satisfied by the optical module are as follows:
[0072] The exit pupil distance is 13 mm, the diopter is from 0 D to -6 D, and the range of the field of view FOV is from 50° to 45°.
[0073] Specifically, in the condition 0.4 < EB / D < 0.67 satisfied by the optical module, the exit pupil diameter EB is 10 mm, the lens assembly aperture D is 24 mm, and EB / D = 0.41.
[0074] Specifically, in the condition 1.2 > S1 / T1 > 0.2 satisfied by the optical module, the sagitta S1 of the second optical structure is 10 mm, the air gap T1 between the center position of the second optical structure and the center position of the first optical structure is 9.5, and S1 / T1 = 1.15.
[0075] Specifically, in the condition 0.23 > (Δd + ΔT) / L > 0.1 satisfied by the optical module, the value of the variable range of the back focal length ΔT is 2 mm (-2 D to -6 D); the value of the moving stroke Δd of the overall movement of the display unit and the lens assembly is 0.8 mm (0 D to -2 D), the distance L between the center position on the side of the first optical structure 22 close to the human eye 24 and the light-emitting surface of the display unit 10 is 25.3 mm, and (Δd + ΔT) / L = 0.11.
[0076] Specifically, in the condition 4 > ΔEFL / Δd > 0.5 satisfied by the optical module, when the diopter of the optical module is 0 D, the focal length EFL1 is 21.1 mm, when the diopter of the optical module is -6 D, the focal length EFL2 is 17.7 mm, and the focal length change amount ΔEFL / Δd of the optical module is 3.9.
[0077] Specifically, in the condition 1 > RAD1 / RAD > 0.4 satisfied by the optical module, RAD1 / RAD = 0.5.
[0078] Embodiment 2
[0079] An embodiment of the present invention provides an optical module with adjustable diopter, which includes a display unit 10 for providing a display image, an optical imaging component for imaging the display image, and further includes a diopter adjustment component. The diopter adjustment component includes a first driving member 31 drivingly connected to the display unit 10 and the lens assembly 21, and a second driving member 32 only drivingly connected to the display unit 10.
[0080] In this embodiment, the optical imaging component includes a lens assembly 21 disposed on the light-emitting optical path of the display unit 10, a first optical structure 22 disposed obliquely on the transmitted optical path of the lens assembly 21, and a second optical structure 23 disposed on the reflected optical path of the first optical structure 22. Through the combination and cooperation of these optical structures, effective imaging and transmission of the display image are achieved.
[0081] Among them, it can be understood that the lens assembly 21 is used to converge light, the inclined setting of the first optical structure 22 is used to change the propagation direction of light, and the second optical structure 23 is used to process the reflected light.
[0082] Specifically, the first driving member 31 can simultaneously drive the display unit 10 and the lens assembly 21 to move, so as to adjust the diopter to the intermediate diopter. The first driving member 31 initially changes the relative positions of the two by cooperatively moving the display unit 10 and the lens assembly 21, thereby achieving the preliminary adjustment of the diopter.
[0083] In this embodiment, the first driving member 31 drives at least the display unit 10 and the lens assembly 21 to move simultaneously.
[0084] In the second embodiment, the conditions satisfied by the optical module are as follows:
[0085] The exit pupil distance is 12 mm, the diopter is 0 D to -7 D, and the range of the field of view angle FOV is 45.4° to 43°.
[0086] Specifically, in the condition 0.4 < EB / D < 0.67 satisfied by the optical module, the exit pupil diameter EB is 12 mm, the lens assembly aperture D is 18 mm, and EB / D = 0.667.
[0087] Specifically, in the condition 1.2 > S1 / T1 > 0.2 satisfied by the optical module, the sagittal height S1 of the second optical structure is 2.1 mm, the air gap T1 between the center position of the second optical structure and the center position of the first optical structure is 9, and S1 / T1 = 0.23.
[0088] Specifically, in the condition 0.23 > (Δd + ΔT) / L > 0.1 satisfied by the optical module, the value of the variable range of the back focal length ΔT is 0.3 mm (-6 D to -7 D); the value of the moving stroke Δd of the overall movement of the display unit and the lens assembly is 4 mm (0 D to -6 D), and the distance L from the center position on the side of the first optical structure 22 close to the human eye 24 to the light emitting surface of the display unit 10 is 21.2 mm, and (Δd + ΔT) / L = 0.21.
[0089] Specifically, in the condition 4 > ΔEFL / Δd > 0.5 satisfied by the optical module, when the diopter of the optical module is 0 D, the focal length EFL1 is 19.5 mm, when the diopter of the optical module is -7 D, the focal length EFL2 is 17.2 mm, and the focal length change amount ΔEFL / Δd of the optical module is 0.975.
[0090] Specifically, in the condition 1 > RAD1 / RAD > 0.4 satisfied by the optical module, RAD1 / RAD = 0.71.
[0091] Based on the foregoing embodiments, an embodiment of the present utility model provides an optical system with adjustable diopter, including the diopter-adjustable optical module of any one of the above. By adopting such an optical module, the entire optical system can be enabled to have a flexible and accurate diopter adjustment function, meeting the usage requirements of different users in different scenarios.
[0092] Finally, it should be noted that although the above embodiments have been described in the text and drawings of the specification of the present application, the patent protection scope of the present application cannot be limited thereby. Any technical solution obtained by equivalent structure or equivalent process substitution or modification based on the substantial concept of the present application and using the content recorded in the text and drawings of the specification of the present application, as well as any technical solution directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, is included in the patent protection scope of the present application.
Claims
1. An optical module with adjustable diopter, characterized in that: include: A display unit, used for providing a display image; An optical imaging component, used for imaging the display image, comprising a lens component and a first optical structure sequentially arranged along the light emitting direction of the display unit, wherein the first optical structure is arranged obliquely, and a second optical structure is arranged on the reflection light path of the first optical structure; A diopter adjustment assembly, comprising a first driving member drivingly connected to the display unit and the lens assembly, and a second driving member drivingly connected to the display unit; The first driving member at least drives the display unit and the lens assembly simultaneously until they are adjusted to an intermediate diopter; The second driving member is used for driving only the display unit to continue to move when the display unit is adjusted to the intermediate diopter, so as to reduce the distance between the display unit and the optical imaging, until the display unit is adjusted to the target diopter; The distance between the center position of the first optical structure close to the human eye and the light-emitting surface of the display unit is L, the moving stroke of the display unit and the lens assembly as a whole is Δd, the variable range of the back focus of the optical module with adjustable diopter is ΔT, and the optical module with adjustable diopter meets the following conditions: 0.23>(Δd+ΔT) / L>0.
1.
2. The optical module with adjustable diopter according to claim 1, characterized in that: The vector height of the second optical structure is S1, the air interval between the center position of the first optical structure and the center position of the second optical structure is T1, and the optical module with adjustable diopter meets the following conditions: 1.2>S1 / T1>0.
2.
3. The optical module with adjustable diopter according to claim 1, characterized in that: The variable range of the back focus of the optical module with adjustable diopter is ΔT, and the value range is 0~2mm.
4. The optical module with adjustable diopter according to claim 1, characterized in that: When the display unit and the lens assembly move as a whole, the moving stroke Δd has a value range of 0-4 mm.
5. The optical module with adjustable diopter according to claim 1, characterized in that: The value of the distance L between the center position of the first optical structure close to the human eye and the light-emitting surface of the display unit is L<26 mm.
6. The optical module with adjustable diopter according to claim 1, characterized in that: The back focus of the optical module with adjustable diopter is 0.7-1.5 mm.
7. The optical module with adjustable diopter according to claim 2, characterized in that: The focal length variation of the optical module with adjustable diopter is ΔEFL, the moving stroke of the display unit and the lens assembly as a whole is Δd, and the optical module with adjustable diopter meets the following conditions: 4>ΔEFL / Δd>0.
5.
8. The optical module with adjustable diopter according to claim 1, characterized in that: The exit pupil diameter of the optical module with adjustable diopter is EB, the lens assembly diameter of the optical module with adjustable diopter is D, and the optical module with adjustable diopter meets the following conditions: 0.4 <EB / D<0.67。 9. The optical module with adjustable diopter according to claim 1, characterized in that: The incident angle of the maximum field of view on the display unit is RAD1, the incident angle of the central field of view on the display unit is RAD, and the optical module with adjustable diopter meets the following conditions: 1>RAD1 / RAD>0.
4.
10. An optical system with adjustable diopter, characterized in that: The invention comprises an optical module with adjustable diopter as claimed in any one of claims 1 to 9.