Eyepiece optical module

Abstract

The utility model discloses an eyepiece optical module, which comprises a lens, an eye side lens seat, a display side lens seat and a display panel which are sequentially arranged from the eye side to the display side along an optical axis, and the lens, the eye side lens seat, the display side lens seat and the display panel jointly define a hollow cavity. The inlet end of the exhaust hole of the display side mirror base abuts against the second annular side wall of the solid structure of the eye side mirror base, so that the situation that when the dustproof gauze carries out pressure maintaining operation at the inlet end of the exhaust hole, all the mirror bases deform due to pressing force can be avoided, and then the hollow cavity is communicated through the exhaust groove perpendicular to the axis of the exhaust hole; and the exhaust structure turning in the midway has a good dustproof effect, and the probability of heavy work of the dustproof gauze is effectively reduced, so that the product quality is ensured.

Description

Technical Field

[0001] This utility model relates to the field of optical module technology, and in particular to an eyepiece optical module. Background Technology

[0002] To handle the heat generated inside the VR device during use, the eyepiece optical module needs to be designed with an exhaust structure to accelerate heat dissipation through air convection. This prevents the internal temperature from becoming too high, which could lead to reduced display panel frequency or shortened component lifespan. At the same time, it balances the internal and external air pressure to prevent the casing from deforming due to pressure differences and causing seal failure.

[0003] To prevent airborne dust from entering the hollow cavity of the eyepiece optical module, the vent connecting to this cavity needs to be covered with dustproof mesh. However, during the manufacturing process, the dustproof mesh is applied using a pressure-holding machine. Excessive pressure can easily deform the cavity. Furthermore, some dustproof mesh that has fallen off, deformed, or is damaged during production needs to be removed and reapplied. Dust generated during this rework process can easily fall directly into the cavity, causing defects in inspection. Therefore, how to improve the quality issues arising from this process is a topic that needs to be studied. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an eyepiece optical module that uses an exhaust structure to expel internal heat, provides excellent dust protection, prevents deformation of the lens mounts during pressure holding operations on the dustproof mesh, and effectively reduces the likelihood of rework on the dustproof mesh, thereby ensuring product quality.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] This utility model provides an eyepiece optical module, including a lens, an eyepiece mount, a display mount, and a display panel arranged sequentially along the optical axis from the eye side to the display side. The lens, eyepiece mount, display mount, and display panel together form a hollow cavity. The display mount includes an exhaust structure and a first annular sidewall. The exhaust structure includes an exhaust hole and an exhaust groove communicating with the exhaust hole. The first annular sidewall is configured to surround the hollow cavity with the optical axis as its axis. The inlet end of the exhaust hole abuts against the second annular sidewall of the eyepiece mount. The outlet end of the exhaust hole is provided with a dustproof mesh. The longitudinal direction of the exhaust groove is perpendicular to the axis of the exhaust hole. The exhaust groove communicates with the hollow cavity and satisfies: Le / Sd≥2.000.

[0007] In one embodiment of this utility model, the exhaust groove is a cuboid structure.

[0008] In one embodiment of this utility model, the aforementioned vent groove is disposed on the eye side of the display side mirror mount facing the eye side.

[0009] In one embodiment of this utility model, the bottom wall of the exhaust groove is a plane.

[0010] In one embodiment of this utility model, the exhaust hole is a tapered hole, and the diameter of the outlet end is smaller than the diameter of the inlet end.

[0011] In one embodiment of this utility model, the exhaust hole is a tapered hole.

[0012] In one embodiment of this utility model, the dustproof mesh is bonded to the display side mirror base by pressure-sensitive adhesive.

[0013] In the above-described eyepiece optical module, the embodiments may further selectively satisfy any of the following conditions:

[0014] Le / Reo ≥ 3.000;

[0015] (Le+Dh-Te) / Reo≥4.000;

[0016] (Le+Dh-Te) / Sd≥2.500;

[0017] Le / We ≥ 2.000;

[0018] 4.000≥(π×Reo 2 ) / (We×Te)≥1.500;

[0019] Dh / Te ≥ 2.000; and

[0020] It satisfies 5 degrees ≥ α ≥ 3 degrees.

[0021] Where Le is the length of the exhaust groove, Sd is the thickness of the first annular sidewall, Reo is the radius of the outlet end of the exhaust hole, Dh is the depth of the exhaust hole, Te is the depth of the exhaust groove, We is the width of the exhaust groove, and α is the taper of the exhaust hole.

[0022] The technical solution provided by this utility model has the following beneficial effects:

[0023] 1. The eyepiece optical module of this utility model supports the lens located on the eye side through the eye-side lens mount and supports the display panel located on the display side through the display-side lens mount, thus forming a combined design that can meet its assembly and configuration requirements.

[0024] 2. In order to solve the heat dissipation problem in the hollow cavity of the eyepiece optical module during operation, an exhaust structure consisting of an exhaust hole and an exhaust groove connected to it is used to accelerate the discharge of heat, and the surface of the exhaust hole is covered with a dustproof mesh to prevent dust from entering.

[0025] 3. This utility model ensures that the inlet end of the exhaust hole of the display side mirror mount abuts against the second annular sidewall of the solid structure of the eye side mirror mount, thus preventing the inlet end of the exhaust hole from being directly connected to the hollow cavity. This helps to improve the problem of deformation of each mirror mount caused by the exhaust hole directly connecting to the hollow cavity with low structural strength during the pressure holding operation of the dustproof mesh at the outlet end of the exhaust hole. It also effectively reduces the probability of rework of the dustproof mesh, thereby ensuring product quality.

[0026] 4. The long direction of the exhaust groove is perpendicular to the axis of the exhaust hole, and the exhaust groove connects to the hollow cavity. Together with the first annular sidewall of the display side mirror mount, it can reduce the probability of small foreign objects such as dust in the air directly entering the hollow cavity through the exhaust hole during the manufacturing process.

[0027] 5. When the length of the exhaust groove and the thickness of the first annular sidewall satisfy: Le / Sd≥2.000, the longer exhaust groove means a longer exhaust path relative to the thickness of the first annular sidewall. Therefore, the path that dust needs to pass through to enter the hollow cavity during the process is longer, and it is less likely to enter the interior of the hollow cavity. Attached Figure Description

[0028] Figure 1 The diagram shown is a structural schematic of the eyepiece optical module in the embodiment;

[0029] Figure 2 The diagram shown is an exploded view of the eyepiece optical module in the embodiment.

[0030] Figure 3 The image shown is a cross-sectional view of the eyepiece optical module in the embodiment;

[0031] Figure 4 The diagram shown is a schematic representation of the eyepiece optical module from another perspective in this embodiment.

[0032] Figure 5 The diagram shown is a schematic representation of the side mirror mount in an embodiment.

[0033] Figure 6 As shown Figure 5 Enlarged diagram of area B in the middle;

[0034] Figure 7 The figure shown is a cross-sectional view of the side mirror mount in the embodiment;

[0035] Figure 8 As shown Figure 7 Enlarged diagram of area C. Detailed Implementation

[0036] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0037] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0038] Reference Figures 1 to 8 This embodiment provides an eyepiece optical module as an important optical module for VR devices.

[0039] like Figures 1 to 4 As shown, the eyepiece optical module of this embodiment includes a lens 1, an eyepiece mount 2, a display mount 3, and a display panel 4 arranged sequentially along the optical axis I from the eye side A1 to the display side A2. The lens 1 is attached to the eyepiece mount 2 by a first adhesive 7, and the eyepiece mount 2 and the display mount 3 are connected to each other by a second adhesive 8. The lens 1, the eyepiece mount 2, the display mount 3, and the display panel 4 together form a hollow cavity 6.

[0040] like Figure 2 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the display side mirror mount 3 includes an exhaust structure 31 and a first annular sidewall 32. Specifically, the exhaust structure 31 includes an exhaust hole 311 and an exhaust groove 312 connected to the exhaust hole 311. The first annular sidewall 32 is configured to surround the hollow cavity 6 with the optical axis I as the axis, and the inlet end 313 of the exhaust hole 311 abuts against the second annular sidewall 21 of the eye side mirror mount 2.

[0041] like Figure 3 , Figure 4 and Figure 6 As shown, the outlet end 314 of the exhaust hole 311 is provided with a dustproof mesh 5 to prevent dust from entering, and the dustproof mesh 5 is bonded to the display side mirror base 3 by pressure-sensitive adhesive. Since the pressure-sensitive adhesive itself only needs to be pressed or held to achieve a stable bond, and does not require curing conditions such as heating or UV irradiation, it is beneficial to ensure the ease of assembly.

[0042] like Figure 8 As shown, the longitudinal direction of the exhaust groove 312 is perpendicular to the axis of the exhaust hole 311, and the exhaust groove 312 is connected to the hollow cavity 6. That is, the exhaust structure 31 formed by the exhaust hole 311 and the exhaust groove 312 connected to it can accelerate the discharge of heat from the hollow cavity 6, so as to solve the heat dissipation problem in the hollow cavity 6 when the eyepiece optical module is operating.

[0043] In this embodiment, as Figure 3 and Figure 6 As shown, the venting groove 312 is provided on the eye side of the display side mirror base 3 facing the eye side A1, which facilitates the processing of the injection mold and also facilitates the second annular sidewall 21 of the eye side mirror base 2 to abut against the groove opening of the venting groove 312 and the inlet end 313 of the venting hole 311. This ensures that the venting structure 31 has sufficient structural strength, thereby preventing deformation of each mirror base due to the pressing force parallel to the axis of the venting hole 311 during the pressure holding operation after the dustproof mesh 5 is attached to the outlet end 314 of the venting hole 311. It also prevents the seal of the eyepiece optical module from failing.

[0044] like Figure 8 As shown, a longer exhaust groove 312 means a longer exhaust path relative to the thickness of the first annular sidewall 32, and the relationship between the length of the exhaust groove 312 and the thickness of the first annular sidewall 32 satisfies: Le / Sd≥2.000, where Le is the length of the exhaust groove 312 and Sd is the thickness of the first annular sidewall 32. Thus, the longer the path that dust needs to take to enter the hollow cavity 6 during the process, the less likely external dust is to enter the interior of the hollow cavity 6.

[0045] In summary, the eyepiece optical module of this embodiment supports the lens 1 located on the eye side A1 through the eye-side lens mount 2, and supports the display panel 4 located on the display side A2 through the display-side lens mount 3, thus forming a combined design that can meet its assembly and configuration requirements.

[0046] In this embodiment, the eyepiece optical module abuts the inlet end 313 of the exhaust hole 311 of the display side lens mount 3 against the second annular sidewall 21 of the solid structure of the eyepiece side lens mount 2. This ensures that the inlet end 313 of the exhaust hole 311 is not directly connected to the hollow cavity 6. This helps to improve the problem of deformation of each lens mount caused by the exhaust hole 311 directly connecting to the hollow cavity 6 with low structural strength during the pressure holding operation of the dustproof mesh 5 at the outlet end 314 of the exhaust hole 311. It also effectively reduces the probability of rework of the dustproof mesh 5, thereby ensuring product quality.

[0047] Furthermore, the longitudinal direction of the exhaust groove 312 is perpendicular to the axial direction of the exhaust hole 311, and the hollow cavity 6 is connected through the exhaust groove 312. In conjunction with the first annular sidewall 32 of the display side mirror seat 3, the probability of small foreign objects such as dust in the air directly entering the hollow cavity 6 through the exhaust hole 311 during the manufacturing process can be reduced.

[0048] Of course, in other embodiments, the preferred ratio of Le / Sd may also be between 2.000 and 5.000.

[0049] In specific implementation, the radius of the outlet end 314 of the exhaust hole 311 in this embodiment is set within a small range, so that the smaller opening reduces the amount of dust entering.

[0050] If the length of the exhaust channel 312 is increased, the path that external dust needs to take before entering the hollow cavity 6 will also be longer.

[0051] Therefore, as Figure 6 As shown, when the relationship between the length of the exhaust groove 312 and the radius of the outlet end 314 of the exhaust hole 311 satisfies: Le / Reo≥3.000, where Reo is the radius of the outlet end 314 of the exhaust hole 311, this helps to prevent dust from entering the hollow cavity 6 through the exhaust hole 311 during the process.

[0052] Further preferred, such as Figure 6 and Figure 8 As shown, the relationship between the length of the exhaust structure 31 and the radius of the outlet end 314 of the exhaust hole 311 in this embodiment satisfies: (Le+Dh-Te) / Reo≥4.000, where Dh is the depth of the exhaust hole 311 and Te is the depth of the exhaust groove 312. This helps to prevent dust from entering the hollow cavity 6 through the exhaust structure 31 during the process.

[0053] Further preferred, such as Figure 8 As shown, relative to the thickness of the first annular sidewall 32, the longer the length of the exhaust structure 31, the longer the path that dust needs to take before entering the hollow cavity 6. Therefore, when the eyepiece optical module of this embodiment satisfies (Le+Dh-Te) / Sd≥2.500, its relatively long exhaust path is beneficial to prevent dust from entering the interior of the hollow cavity 6 through the exhaust structure 31 during the manufacturing process.

[0054] Further preferred, such as Figure 6 and Figure 8 As shown, the specific exhaust groove 312 has a cuboid structure, and the eyepiece optical module of this embodiment satisfies: Le / We≥2.000, where We is the width of the exhaust groove 312. This helps to prevent dust from entering the hollow cavity 6 without affecting the strength of the regional structure, and is also easy to process.

[0055] Further preferred, such as Figure 6 and Figure 8 As shown, increasing the cross-sectional area of ​​the outlet end 314 of the exhaust port 311 is more beneficial to enhancing the exhaust effect, but it will increase the amount of dust entering the process. A larger cross-sectional area of ​​the exhaust groove 312 is also beneficial to enhancing the exhaust effect, but the structural strength of the area needs to be considered. Therefore, the eyepiece optical module in this embodiment satisfies: 4.000 ≥ (π × Reo 2The ratio of We to Te is ≥1.500, meaning that when the ratio between the two meets a certain value range, it can take into account the overall exhaust effect, prevent excessive dust ingress during the process, and ensure the gas outlet flow rate per unit area after the gas is turned during the exhaust process while maintaining heat dissipation.

[0056] Further preferred, such as Figure 8 As shown, the eyepiece optical module in this embodiment satisfies: Dh / Te≥2.000, which ensures exhaust efficiency while also guaranteeing the strength and stability of the exhaust structure 31.

[0057] Of course, in other embodiments, the preferred ratio of Le / Reo can also be between 3.000 and 7.000; the preferred ratio of (Le+Dh-Te) / Reo can also be between 4.000 and 8.000; the preferred ratio of (Le+Dh-Te) / Sd can also be between 2.500 and 6.000; the preferred ratio of Le / We can also be between 2.000 and 4.000; and the preferred ratio of Dh / Te can also be between 2.000 and 3.000.

[0058] Furthermore, the exhaust groove 312 can also adopt a trapezoidal groove structure or an arched groove structure, which will not be described in detail here.

[0059] More preferably, the vent 311 is a tapered hole, and the diameter of its outlet end 314 is smaller than the diameter of its inlet end 313. That is, the radius Reo of the outlet end 314 of the vent 311 is less than the radius Rei of the inlet end 313 of the vent 311, which helps to reduce the difficulty of demolding after injection molding.

[0060] More preferably, the vent hole 311 is a tapered hole, and satisfies 5 degrees ≥ α ≥ 3 degrees, where α is the taper of the vent hole 311, which helps to reduce the difficulty of demolding after injection molding.

[0061] In specific implementation, the eyepiece optical module was designed according to the parameters of the four different embodiments shown in Table 1 below, and verified one by one. The test results are as follows: Each embodiment can dissipate internal heat through the exhaust structure 31, and achieve a good dustproof effect. It can also prevent deformation of each lens mount when the dustproof mesh 5 is pressure maintained, and effectively reduce the probability of the dustproof mesh 5 being reworked, thereby ensuring product quality.

[0062] Table 1:

[0063]

[0064]

[0065] Of course, in other embodiments, the preferred range of Le can also be 2.000 to 5.000 mm; the preferred range of We can also be 1.000 to 1.500 mm; the preferred range of Te can also be 0.500 to 1.250 mm; the preferred range of Sd can also be 1.000 to 2.000 mm; the preferred range of Rei can also be 0.580 to 1.550 mm; the preferred range of Reo can also be 0.500 to 1.500 mm; and the preferred range of Dh can also be 1.520 to 2.500 mm.

[0066] Preferably, the bottom wall of the venting groove 312 is flat, which facilitates the use of a flat-bottomed end mill to process the injection mold, thereby improving the ease of processing.

[0067] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. An eyepiece optical module, characterized by: It includes a lens, an eye-side lens mount, a display-side lens mount, and a display panel arranged sequentially along an optical axis from an eye-side to a display-side; The lens, the eyepiece mount, the display mount, and the display panel together form a hollow cavity; The display side mirror mount includes an exhaust structure and a first annular sidewall; the exhaust structure includes an exhaust hole and an exhaust groove communicating with the exhaust hole; the first annular sidewall is configured to surround the hollow cavity with the optical axis as the axis; One inlet end of the vent abuts against a second annular sidewall of the eyepiece mount, and a dustproof mesh is provided at one outlet end of the vent. The longitudinal direction of the exhaust groove is perpendicular to the axis of the exhaust hole. The exhaust groove connects to the hollow cavity and satisfies: Le / Sd≥2.000, where Le is the length of the exhaust groove and Sd is the thickness of the first annular sidewall.

2. The eyepiece optical module of claim 1, wherein: Furthermore, it satisfies Le / Reo≥3.000, where Reo is the radius of the outlet end of the vent.

3. The eyepiece optical module of claim 1, wherein: Furthermore, it satisfies (Le+Dh-Te) / Reo≥4.000, where Dh is the depth of the exhaust port, Te is the depth of the exhaust groove, and Reo is the radius of the outlet end of the exhaust port.

4. The eyepiece optical module of claim 1, wherein: It further satisfies (Le+Dh-Te) / Sd≥2.500, where Dh is the depth of the exhaust hole and Te is the depth of the exhaust groove.

5. The eyepiece optical module of claim 1, wherein: The exhaust channel is a cuboid structure and satisfies Le / We≥2.000, where We is the width of the exhaust channel.

6. The eyepiece optical module of claim 1, wherein: More satisfies 4.000≥(π×Reo) 2 ) / (We×Te)≥1.500, where Reo is the radius of the outlet end of the exhaust hole, We is the width of the exhaust groove, and Te is the depth of the exhaust groove.

7. The eyepiece optical module of claim 1, wherein: Furthermore, it satisfies Dh / Te≥2.000, where Dh is the depth of the vent hole and Te is the depth of the vent groove.

8. The eyepiece optical module of claim 1, wherein: The vent is located on the side of the display side mirror mount facing the eye.

9. The eyepiece optical module of claim 1, wherein: The bottom wall of the exhaust duct is flat.

10. The eyepiece optical module of claim 1, wherein: The exhaust port is a tapered hole, and the diameter of the outlet end is smaller than the diameter of the inlet end.

11. The eyepiece optical module of claim 1, wherein: The exhaust port is a tapered port, and satisfies 5 degrees ≥ α ≥ 3 degrees, where α is the taper of the exhaust port.

12. The eyepiece optical module of claim 1, wherein: The dustproof mesh is bonded to the display side mirror mount using pressure-sensitive adhesive.

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