Optical module and head-mounted display device
By limiting the field-angle ratio of the optical element in the optical module of the head-mounted display device, the problem that the equipment is difficult to achieve small volume and high-quality imaging is solved, and the effect of maintaining high-quality imaging in the miniaturized module is achieved.
Patent Information
- Application Number
- CN202421502382.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The prior art is difficult to achieve the small volume and high-quality imaging effects of head-mounted display devices simultaneously. Overweight or excessively large optical modules affect the user experience, while reducing the number and volume of lenses may lead to image distortion or increase in chromatic aberration.
By designing an optical module consisting of the first and second optical elements, limiting the ratio of the incident and exit angle of the main light of its maximum field of view, ensuring that the refractive angle of the light between the lenses is within a suitable range, thereby balancing the imaging quality and module volume.
It is achieved while miniaturizing the optical module, maintaining high-quality imaging, avoiding the reduction of clarity and contrast caused by too small refractive angle, and also avoiding image distortion and increase in chromatic aberration caused by too large refractive angle.
Smart Images
Figure CN222653170U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of near-eye display, and in particular to an optical module and a head-mounted display device. Background Art
[0002] With the development of virtual reality (VR) and augmented reality (AR) technologies, head-mounted display devices (HMDs) have received widespread attention and application as an important human-computer interaction device. Head-mounted display devices can provide a more immersive visual experience, making users feel as if they are in a virtual environment or augmented reality scene, providing users with an immersive experience. In the design of head-mounted display devices, optical modules are a key component, and the performance of optical modules directly affects the display quality and user experience.
[0003] Since head-mounted display devices need to be worn on the user's head, an optical module that is too heavy or too large will cause discomfort to the user and affect the user experience. Therefore, the weight and volume of the lenses in the optical module are limited; but if the number, weight and volume of the lenses are simply reduced in order to compress the volume of the optical module, it will easily affect the image quality, resulting in image distortion or increased chromatic aberration.
[0004] The above information is presented as background information only to assist with understanding the present disclosure and no determination or admission is made as to whether any of the above may be used as prior art with respect to the present disclosure. Utility Model Content
[0005] The utility model provides an optical module and a head-mounted display device, so as to solve the problem in the prior art that the head-mounted display device is difficult to achieve both small size and high-quality imaging effect.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] An optical module, the optical module consisting of a first optical element and a second optical element;
[0008] The first side surface of the first optical element faces the human eye, the first side surface of the second optical element faces the second side surface of the first optical element, and the second side surface of the second optical element faces the display screen; the optical module meets the following conditions:
[0009] 0≤|sin(θ1) / sin(θ2)|≤7;
[0010] Wherein, θ1 is the incident angle of the principal ray of the maximum field of view of the first optical element, and θ2 is the incident angle of the principal ray of the maximum field of view of the second optical element.
[0011] Optionally, the optical module also meets the following conditions:
[0012] 1≤|(D1+D2) / T2|≤10;
[0013] Wherein, D1 is the distance from the second side surface of the first optical element to the first side surface of the second optical element, D2 is the distance from the second side surface of the second optical element to the screen, and T2 is the central thickness of the second optical element.
[0014] Optionally, the optical module also meets the following conditions:
[0015] 2≤F≤6.5;
[0016] Wherein, F is the image space F number of the optical module.
[0017] Optionally, when the first optical element and the second optical element are lenses, the optical module further satisfies the following conditions:
[0018] 1≤|T1 / S1|≤5;
[0019] Wherein, S1 is the sagittal height of the second side surface of the first optical element, and T1 is the central thickness of the first optical element.
[0020] Optionally, when the first optical element and the second optical element are lenses, the optical module further satisfies the following conditions:
[0021] 1≤|T1 / S1|≤5;
[0022] Wherein, S1 is the sagittal height of the first side surface of the first optical element, and T1 is the central thickness of the first optical element.
[0023] Optionally, the optical module also meets the following conditions:
[0024] 1≤|(S1+S2) / S3|≤5;
[0025] Wherein, S2 is the sagittal height of the first side surface of the second optical element, and S3 is the sagittal height of the second side surface of the second optical element.
[0026] Optionally, the second side surface of the first optical element is an even-order aspheric surface;
[0027] The first side surface of the second optical element and the second side surface of the second optical element are both even-order aspherical surfaces;
[0028] The quartic term of the second side of the first optical element is defined as A1, the quartic term of the first side of the second optical element is defined as A2, and the quartic term of the first side of the second optical element is defined as A3. The optical module also satisfies the following conditions:
[0029] 0≤|(A1+A2) / A3|≤100.
[0030] Optionally, the first refractive index N1 of the first optical element satisfies the following condition:
[0031] 1.4≤N1≤1.6.
[0032] Optionally, the second refractive index N2 of the second optical element satisfies the following condition:
[0033] 1.5≤N2≤1.8.
[0034] The utility model also provides a head mounted display device, comprising the optical module as described in any one of the above items.
[0035] Compared with the prior art, the utility model has the following beneficial effects:
[0036] The utility model provides an optical module and a head mounted display device, which can limit the refraction angle of light between lenses within a suitable range while realizing miniaturization of the optical module by limiting the ratio of the incident angle of the principal light of the maximum field of view of the first optical element to the exit angle of the principal light of the maximum field of view of the second optical element, so that the clarity and contrast of the image will not be reduced due to the refraction angle of the light being too small, and the distortion and chromatic aberration of the image will not be increased due to the refraction angle of the light being too large.
[0037] Therefore, the utility model strikes a good balance between the imaging quality and the volume of the optical module, effectively improving the user experience while meeting the miniaturization design requirements of the head-mounted display device.
[0038] The present invention has other characteristics and advantages, which will be apparent from the accompanying drawings and subsequent specific embodiments incorporated herein, or will be described in detail in the accompanying drawings and subsequent specific embodiments incorporated herein, which together are used to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0039] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0040] Figure 1 This is a structural schematic diagram of an optical module provided by the utility model;
[0041] Figure 2 This is another structural schematic diagram of an optical module provided by the utility model;
[0042] Figure 3 This is another structural schematic diagram of an optical module provided by the utility model;
[0043] Figure 4 This is a schematic diagram of the structure of an optical module provided by an embodiment of the utility model
[0044] Figure 5 From left to right are field curvature / astigmatism and distortion curves of an optical module according to an embodiment of the present utility model;
[0045] Figure 6 From left to right are field curvature / astigmatism and distortion curves of an optical module according to an embodiment of the present utility model;
[0046] Figure 7 From left to right are field curvature / astigmatism and distortion curves of an optical module according to an embodiment of the present utility model;
[0047] Figure 8 From left to right are field curvature / astigmatism and distortion curves of an optical module according to an embodiment of the present utility model;
[0048] Fig. 9 From left to right are field curvature / astigmatism and distortion curves of an optical module according to an embodiment of the present utility model;
[0049] Fig.10 From left to right are field curvature / astigmatism and distortion curves of an optical module that is a counterexample of the present invention.
[0050] Reference numerals: E1, first optical element; E2, second optical element; 11, first side surface of the first optical element; 12, second side surface of the first optical element; 21, first side surface of the second optical element; 22, second side surface of the second optical element;
[0051] 30. Human eye; 40. Display screen. DETAILED DESCRIPTION
[0052] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.
[0053] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.
[0054] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document is only for describing specific embodiments and is not intended to limit this application.
[0055] In the present application, terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship of quantity, priority or sequence between these entities or operations.
[0056] Without further limitations, in this application, the words "include", "comprises", "has" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those limited elements, but also other elements not explicitly listed, or also include elements inherent to such process, method or product.
[0057] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than", "less than", "exceed" and the like are understood to exclude the number itself; expressions such as "above", "below", "within" and the like are understood to include the number itself. In addition, in the description of the embodiments of this application, "multiple" means more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise clearly and specifically limited.
[0058] The solution of the utility model is described in detail below in conjunction with the accompanying drawings.
[0059] Please refer to Figures 1 to 3 The utility model provides an optical module, which is composed of a first optical element E1 and a second optical element E2 which are sequentially arranged along a human eye 30 to a display screen 40 .
[0060] Specifically, the first optical element E1 is a lens having a first refractive index N1, and the first side surface 11 of the first optical element faces the human eye 30;
[0061] The second optical element E2 is a lens with a second refractive index N2 . The first side surface 21 of the second optical element faces the second side surface 12 of the first optical element, and the second side surface 22 of the second optical element faces the display screen 40 .
[0062] Please refer to Figure 1 In the present invention, the optical module meets the following conditions:
[0063] 0≤|sin(θ1) / sin(θ2)|≤7;
[0064] Wherein, θ1 is the maximum field of view chief ray exit angle of the first optical element E1, and θ2 is the maximum field of view chief ray incident angle of the second optical element E2.
[0065] In a specific implementation, the optical module may meet the following conditions:
[0066] |sin(θ1) / sin(θ2)|=0.5, 1, 1.4, 3, 5, 7.
[0067] In this embodiment, the light emitted by the display screen 40 enters through the side of the second optical element close to the display screen, is reflected at the side of the first optical element close to or far from the display screen, and then is reflected by the side of the second optical element close to or far from the display screen, and then is emitted through the first optical element to enter the human eye 30 to form an image.
[0068] In a specific implementation process, at least one of the first optical element and the second optical element is a lens element, and the other one can be a lens element or a flat plate element.
[0069] It can be understood that the ratio of the maximum field of view principal light exit angle of the first optical element E1 to the maximum field of view principal light incident angle of the second optical element E2 can affect the refraction angle of light between lenses. If the refraction angle is too large, it may cause the clarity and contrast of the image to be reduced. If the refraction of light between lenses is large, it may cause image distortion and increased chromatic aberration.
[0070] In the present implementation process, by limiting the ratio of the maximum field of view principal light exit angle of the first optical element E1 and the maximum field of view principal light incident angle of the second optical element E2, the refraction angle of light between lenses can be limited to a suitable range while miniaturizing the optical module. The image clarity and contrast will not be reduced due to a too small refraction angle of light, nor will the image distortion and chromatic aberration be increased due to a too large refraction angle of light, thereby ensuring the imaging quality.
[0071] Please refer to Figure 3 , further, the optical module also satisfies the following conditions:
[0072] 1≤|(D1+D2) / T2|≤10;
[0073] Wherein, D1 is the distance from the second side surface 12 of the first optical element to the first side surface 21 of the second optical element, D2 is the distance from the second side surface 22 of the second optical element to the screen, and T2 is the center thickness of the second optical element E2.
[0074] In an optional implementation, |(D1+D2) / T2|=4.85.
[0075] In the present invention, by limiting the distance between the first optical element E1 and the second optical element E2, and limiting the middle thickness of the second optical element E2, it is beneficial to further reduce the probability of image distortion and chromatic aberration increase, and further improve the imaging quality.
[0076] Furthermore, the optical module also meets the following conditions:
[0077] 2≤F≤6.5;
[0078] Wherein, F is the image space F number of the optical module.
[0079] In an optional embodiment, F=5.66.
[0080] Specifically, the ratio f / D of the effective focal length f of the optical module to the entrance diameter D is defined as the image space F number. The first optical element E1, the second optical element E2, the screen and the pupil size of the human eye 30 of the optical module jointly define the image space F number, that is, as the size of the pupil of the human eye 30 changes with the ambient light, it will also affect the size of the image space F number.
[0081] It can be understood that a smaller image space F number means that the optical system has a larger aperture, thereby being able to collect more light to provide a brighter image; while a larger image space F number means that the system has a smaller aperture, which can provide a deeper depth of field, making the image clearer.
[0082] The present invention comprehensively considers factors such as the first optical element E1, the second optical element E2, the screen and the pupil size of the human eye 30, so that the image space F number is within a suitable range, thereby obtaining good imaging quality and user experience.
[0083] Please refer to Figure 2 and Figure 3 Furthermore, when the first optical element and the second optical element are lenses, the optical module also satisfies the following conditions:
[0084] 1≤|T1 / S1|≤5;
[0085] Wherein, is the sagittal height of the second side surface 12 of the first optical element, and T1 is the central thickness of the first optical element E1.
[0086] In an optional embodiment, |T1 / S1|=1.2.
[0087] Optionally, when the first optical element and the second optical element are lenses, the optical module further satisfies the following conditions:
[0088] 1≤|T1 / S1|≤5;
[0089] Wherein, is the sagittal height of the first side surface 12 of the first optical element, and T1 is the central thickness of the first optical element E1.
[0090] In an optional embodiment, |T1 / S1|=1.2.
[0091] It is understandable that the ratio of S1 to T1 is related to the shape and thickness of the lens. The utility model further defines the thickness and shape of the first optical element E1 to avoid image distortion caused by the first optical element E1 being too flat and having a large thickness, and to avoid image clarity and contrast reduction caused by the first optical element E1 being too curved and having a small thickness, which is conducive to better improving the imaging quality.
[0092] Please refer to Figure 2 , further, the optical module also satisfies the following conditions:
[0093] 1≤|(S1+S2) / S3|≤5;
[0094] Wherein, S2 is the sagittal height of the first side surface 21 of the second optical element, and S3 is the sagittal height of the second side surface 22 of the second optical element.
[0095] In an optional implementation, |(S1+S2) / S3|=1.58.
[0096] It can be understood that the present invention further limits the thickness and shape of the second optical element E2, which is beneficial to avoiding image distortion and excessive chromatic aberration, and ensures image clarity and contrast, thereby improving display effects.
[0097] Optionally, the second side surface 12 of the first optical element is an even-order aspheric surface; the first side surface 21 of the second optical element and the second side surface 22 of the second optical element are both even-order aspheric surfaces.
[0098] Further, the quartic term of the second side surface 12 of the first optical element is defined as A1, the quartic term of the first side surface 21 of the second optical element is defined as A2, the quartic term of the first side surface 21 of the second optical element is defined as A3, and the optical module also satisfies the following conditions:
[0099] 0≤|(A1+A2) / A3|≤100.
[0100] In an optional implementation, |(A1+A2) / A3|=4.5.
[0101] It is understandable that aspheric lenses can correct aberrations to improve image quality. The utility model reasonably limits the surface shapes of the first optical element E1 and the second optical element E2, so that the aspheric shapes of the first optical element E1 and the second optical element E2 are not too flat or steep, avoiding insufficient or excessive correction of image aberrations, thereby ensuring a better aberration correction effect and improving image quality.
[0102] Furthermore, in the present invention, the first refractive index N1 of the first optical element E1 satisfies the following conditions:
[0103] 1.4≤N1≤1.6;
[0104] The second refractive index N2 of the second optical element E2 satisfies the following condition:
[0105] 1.5≤N2≤1.8.
[0106] In the present invention, by making the refractive index of the first optical element E1 and the second optical element E2 satisfy the above-mentioned conditions, a better refractive index can be provided, and the processing difficulty can be reduced, which is beneficial to improving the yield rate; at the same time, by controlling the refractive index of the first optical element E1 and the second optical element E2 within a reasonable range, the lens can be made thinner and lighter, thereby reducing the weight and volume of the entire optical system; in addition, the field of view can be increased to provide a wider field of view.
[0107] It should be noted that the above refractive index range is for reference only. In practice, multiple factors can be considered comprehensively and detailed optical design and optimization can be carried out. In addition, the material, surface treatment and manufacturing process of the lens will also affect the performance.
[0108] The optical module provided by the utility model is described in detail with specific embodiments below.
[0109] First embodiment
[0110] Please refer to Figure 4 Based on this, further reference Figure 5 , Figure 5From left to right are field curvature / astigmatism and distortion curves of an optical module of this embodiment.
[0111] This embodiment provides an optical module, which is composed of a first optical element E1 and a second optical element E2 which are sequentially arranged along a human eye 30 to a display screen 40 .
[0112] Specifically, the first optical element E1 is a lens having a first refractive index N1, and the first side surface 11 of the first optical element faces the human eye 30;
[0113] The second optical element E2 is a lens with a second refractive index N2 . The first side surface 21 of the second optical element faces the second side surface 12 of the first optical element, and the second side surface 22 of the second optical element faces the display screen 40 .
[0114] Please refer to the following Table 1, which shows the conditions satisfied by the optical module in the first embodiment.
[0115]
[0116] Second embodiment
[0117] Please refer to Figure 4 Based on this, further reference Figure 6 , Figure 6 From left to right are field curvature / astigmatism and distortion curves of an optical module of this embodiment.
[0118] This embodiment provides an optical module, which is composed of a first optical element E1 and a second optical element E2 which are sequentially arranged along a human eye 30 to a display screen 40 .
[0119] Specifically, the first optical element E1 is a lens having a first refractive index N1, and the first side surface 11 of the first optical element faces the human eye 30;
[0120] The second optical element E2 is a lens with a second refractive index N2 . The first side surface 21 of the second optical element faces the second side surface 12 of the first optical element, and the second side surface 22 of the second optical element faces the display screen 40 .
[0121] Please refer to the following Table 2, which shows the conditions satisfied by the optical module in the second embodiment.
[0122]
[0123] Third embodiment
[0124] Please refer to Figure 4 Based on this, further reference Figure 7 , Figure 7From left to right are field curvature / astigmatism and distortion curves of an optical module of this embodiment.
[0125] This embodiment provides an optical module, which is composed of a first optical element E1 and a second optical element E2 which are sequentially arranged along a human eye 30 to a display screen 40 .
[0126] Specifically, the first optical element E1 is a lens having a first refractive index N1, and the first side surface 11 of the first optical element faces the human eye 30;
[0127] The second optical element E2 is a lens with a second refractive index N2 . The first side surface 21 of the second optical element faces the second side surface 12 of the first optical element, and the second side surface 22 of the second optical element faces the display screen 40 .
[0128] Please refer to Table 3 below. Table 3 shows the conditions satisfied by the optical module in the third embodiment.
[0129]
[0130] Fourth embodiment
[0131] Please refer to Figure 4 Based on this, further reference Figure 8 , Figure 8 From left to right are field curvature / astigmatism and distortion curves of an optical module of this embodiment.
[0132] This embodiment provides an optical module, which is composed of a first optical element E1 and a second optical element E2 which are sequentially arranged along a human eye 30 to a display screen 40 .
[0133] Specifically, the first optical element E1 is a lens having a first refractive index N1, and the first side surface 11 of the first optical element faces the human eye 30;
[0134] The second optical element E2 is a lens with a second refractive index N2 . The first side surface 21 of the second optical element faces the second side surface 12 of the first optical element, and the second side surface 22 of the second optical element faces the display screen 40 .
[0135] Please refer to Table 4 below. Table 4 shows the conditions satisfied by the optical module in the fourth embodiment.
[0136]
[0137] Fifth embodiment
[0138] Please refer to Figure 4 Based on this, further reference Fig. 9 , Fig. 9From left to right are field curvature / astigmatism and distortion curves of an optical module of this embodiment.
[0139] This embodiment provides an optical module, which is composed of a first optical element E1 and a second optical element E2 which are sequentially arranged along a human eye 30 to a display screen 40 .
[0140] Specifically, the first optical element E1 is a lens having a first refractive index N1, and the first side surface 11 of the first optical element faces the human eye 30;
[0141] The second optical element E2 is a lens with a second refractive index N2 . The first side surface 21 of the second optical element faces the second side surface 12 of the first optical element, and the second side surface 22 of the second optical element faces the display screen 40 .
[0142] Please refer to the following Table 5, which shows the conditions satisfied by the optical module in the fifth embodiment.
[0143]
[0144] Counterexample
[0145] In order to make the whole scheme more perfect, counterexamples are listed according to the description of the above implementation column, please refer to Fig.10 , Fig.10 From left to right are the field curvature / astigmatism and distortion curves of an optical module in this counter-example. Please refer to Table 6 below, which shows the conditions satisfied by the optical module in this counter-example:
[0146]
[0147] Depend on Fig.10 It can be seen that since this counterexample does not meet the above conditions, the imaging clarity of the optical system in different directions is inconsistent, and the degree of deformation of the imaging is serious, resulting in a poor display effect.
[0148] Embodiment 6
[0149] Based on the foregoing embodiments, this embodiment provides a head mounted display device;
[0150] For example, the head-mounted display device in this embodiment may be a virtual reality helmet, augmented reality glasses, etc., which can be applied to fields such as gaming, education, medical treatment, and industry.
[0151] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of this application, this does not limit the scope of patent protection of this application. All technical solutions generated by replacing or modifying equivalent structures or equivalent processes based on the essential concept of this application using the contents recorded in the specification and drawings of this application, as well as directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, are included in the scope of patent protection of this application.
Claims
1. An optical module, characterized in that: The optical module consists of a first optical element and a second optical element; The first side surface of the first optical element faces the human eye, the first side surface of the second optical element faces the second side surface of the first optical element, and the second side surface of the second optical element faces the display screen; the optical module meets the following conditions: 0≤|sin(θ1) / sin(θ2)|≤7; Wherein, θ1 is the incident angle of the principal ray of the maximum field of view of the first optical element, and θ2 is the incident angle of the principal ray of the maximum field of view of the second optical element.
2. The optical module according to claim 1, characterized in that: The optical module also meets the following conditions: 1≤|(D1+D2) / T2|≤10; Wherein, D1 is the distance from the second side surface of the first optical element to the first side surface of the second optical element, D2 is the distance from the second side surface of the second optical element to the screen, and T2 is the central thickness of the second optical element.
3. The optical module according to claim 1, characterized in that: The optical module also meets the following conditions: 2≤F≤6.5； Wherein, F is the image space F number of the optical module.
4. The optical module according to claim 1, characterized in that: When the first optical element and the second optical element are lenses, the optical module also satisfies the following conditions: 1≤|T1 / S1|≤5; Wherein, S1 is the sagittal height of the second side surface of the first optical element, and T1 is the central thickness of the first optical element.
5. The optical module according to claim 1, characterized in that: When the first optical element and the second optical element are lenses, the optical module also satisfies the following conditions: 1≤|T1 / S1|≤5; Wherein, S1 is the sagittal height of the first side surface of the first optical element, and T1 is the central thickness of the first optical element.
6. The optical module according to claim 4, characterized in that: The optical module also meets the following conditions: 1≤|(S1+S2) / S3|≤5; Wherein, S2 is the sagittal height of the first side surface of the second optical element, and S3 is the sagittal height of the second side surface of the second optical element.
7. The optical module according to claim 4, characterized in that: The second side surface of the first optical element is an even-order aspheric surface; The first side surface of the second optical element and the second side surface of the second optical element are both even-order aspherical surfaces; The quartic term of the second side of the first optical element is defined as A1, the quartic term of the first side of the second optical element is defined as A2, and the quartic term of the first side of the second optical element is defined as A3. The optical module also satisfies the following conditions: 0≤|(A1+A2) / A3|≤100.
8. The optical module according to claim 1, characterized in that: The first refractive index N1 of the first optical element satisfies the following condition: 1.4≤N1≤1.6。 9. The optical module according to claim 1, characterized in that: The second refractive index N2 of the second optical element satisfies the following condition: 1.5≤N2≤1.8。 10. A head mounted display device, characterized in that: Comprising the optical module as claimed in any one of claims 1 to 9.