Eyepiece optical system module

Abstract

The utility model provides a kind of eyepiece optical system module, including first shell, second shell and first lens, wherein first shell and second shell each have first assembly plane and second assembly plane, and meet the condition of 1 ≦TSHmin / DHSH ≦3, to solve the alignment problem caused by assembly plane height difference. Through the direct bearing of three bearing columns in the optical axis direction, cooperate with the setting of the adhesive layer to avoid the bearing column, effectively reduce the module volume and improve the assembly stability. Further utilize single positioning column, positioning hole, correction column and semicircular correction groove design, realize XY direction accurate alignment and allow forming error, improve assembly yield and precision, suitable for VR module and other lightweight optical systems.

Description

Technical Field

[0001] This utility model relates to the field of optical modules, and in particular to an improved eyepiece optical system module. By designing the assembly plane of the first and second housings, a three-point bearing structure, and a positioning and correction structure, it improves assembly accuracy and stability, reduces alignment problems caused by height differences and process errors, and is suitable for lightweight optical systems such as virtual reality (VR) modules. Background Technology

[0002] With the rapid development of virtual reality (VR) technology, the design of VR module housings needs to balance lightweight design and ergonomics to improve wearing comfort. However, conventional VR modules often suffer from excessive size and weight due to complex assembly structures, affecting the user experience. To reduce size, the assembly surfaces of the module housing are typically composed of multiple non-flat planes, such as a first assembly plane, a second assembly plane, and an inclined plane. However, when the assembly surfaces have height differences, the traditional three-point alignment structure is prone to three-axis positional deviations in the optical axis direction (Z-axis) and the XY plane perpendicular to the optical axis. In addition, VR module housings are mostly non-circular symmetrical structures. When the design has height differences in the assembly surfaces, the molding variation will be further increased due to material properties during injection molding, resulting in the third-point alignment structure being unable to fit precisely. This often requires multiple mold adjustments, generating a large number of scraps and economic losses. Therefore, how to achieve precise alignment and stable assembly of housings with assembly surfaces of height differences while reducing size is a technical problem that urgently needs to be solved in this field. Utility Model Content

[0003] This invention proposes an eyepiece optical system module, including a first housing, a second housing disposed on the first housing, and a first lens disposed on the second housing. The first and second housings each have a first assembly plane and a second assembly plane, satisfying the following condition: 1 ≤ TSHmin / DHSH ≤ 3, where DHSH is the height difference between the first and second assembly planes along the optical axis, TSHmin is the minimum thickness of the second housing, and three support pillars are disposed on the first and second assembly planes of either the first or second housing, with only three support pillars on either housing. The adhesive layer is directly supported in the optical axis direction and is disposed between the first housing and the second housing, while avoiding the three support pillars. One of the first housing or the second housing has a positioning pillar disposed on the first assembly plane and a correction pillar disposed on the second assembly plane. The other of the first housing or the second housing has a positioning hole disposed on the first assembly plane and a correction groove disposed on the second assembly plane. The first housing and the second housing together contain only one positioning pillar, one positioning hole, one correction pillar and one correction groove. The correction groove is a semi-circular groove, and the top of the semi-circle extends radially to accommodate forming errors.

[0004] The present invention is characterized in that one of the first or second outer shells has a positioning post disposed on the first assembly plane and a correction post disposed on the second assembly plane, and the other outer shell (the other of the first or second outer shells) has a positioning hole disposed on the first assembly plane and a correction groove disposed on the second assembly plane. The first and second outer shells together comprise only a single positioning post, a single positioning hole, a single correction post, a single correction groove, and three supporting posts. The correction groove is a semi-circular groove with its top extending radially to accommodate forming errors, facilitating mold trimming and fine-tuning. The other three supporting posts are disposed on the first and second assembly planes of the first or second outer shell, directly supporting the components along the optical axis. An adhesive layer is disposed between the first and second outer shells, avoiding the supporting posts, effectively reducing the module size and preventing adhesive overflow between the supporting posts and the assembly plane, thus avoiding eccentricity or deformation. This design achieves precise alignment in the XY directions and allows for fine-tuning through the gaps in the correction groove, improving assembly accuracy and yield. To address the height difference issue arising from the reduced size of VR module housings at the assembly surfaces, a three-point support structure combined with a single set of positioning and correction structures is designed to replace the traditional multi-point alignment structure. This reduces the number of alignment components and lowers the risk of alignment failures due to process errors, making it particularly suitable for lightweight VR modules. Furthermore, this invention specifies certain parameter conditions; when these conditions are met, a suitable height difference can be ensured, making the newly designed structure suitable for alignment and assembly, and improving assembly yield and quality. Attached Figure Description

[0005] Figure 1 An exploded view of the eyepiece optical system module of this utility model is shown, which includes a first housing, a second housing, and a first lens.

[0006] Figure 2 Draw side views of the first and second housings, and define the first assembly plane, the second assembly plane, and the inclined plane.

[0007] Figure 3 A schematic diagram of the structure of the first outer shell is shown.

[0008] Figure 4 Draw the cross-sectional structure of the positioning column and the correction column.

[0009] Figure 5 A schematic diagram of the second outer shell is shown.

[0010] Figure 6 Draw the cross-sectional structure and top view of the positioning hole and the correction groove.

[0011] Figure 7 Draw a schematic diagram of the assembled structure.

[0012] Figure 8 Draw the corresponding Figure 7 Enlarged cross-sectional view.

[0013] Explanation of reference numerals in the attached figures:

[0014] 10: First outer casing; 20: Second outer casing; 30: First lens; 40: Support column;

[0015] 50: Positioning pin; 52: Positioning hole; 60: Alignment pin; 62: Alignment groove;

[0016] 70: Groove; 72: Protrusion;

[0017] 82: First lens plane; 84: Second lens plane; 86: Lens support surface;

[0018] DHSH: Height difference between the first assembly plane and the second assembly plane;

[0019] H1: Total height of the positioning post; H2: Height of the cylindrical portion of the positioning post; H3: Total height of the alignment post; H4: Height of the cylindrical portion of the alignment post;

[0020] Hc: Depth of positioning hole; Hu: Depth of calibration groove;

[0021] O: Center point;

[0022] r1: Radius of the bottom surface of the positioning post; r2: Radius of the top surface of the positioning post; r3: Radius of the bottom surface of the calibration post; r4: Radius of the top surface of the calibration post; rc: Radius of the positioning hole; ru: Radius of the calibration groove;

[0023] S1: First surface of the first outer shell; S11: First assembly plane of the first outer shell; S12: Second assembly plane of the first outer shell; S13: Inclined surface of the first outer shell;

[0024] S2: Second surface of the second outer shell; S21: First assembly plane of the second outer shell; S22: Second assembly plane of the second outer shell; S23: Inclined surface of the second outer shell;

[0025] TSHmin: Minimum thickness of the second outer shell; Wu: Radial width from the center of the correction groove to the circumference of the outer shell; WH: Radial width of the outer shell corresponding to the position of the correction groove. Detailed Implementation

[0026] To enable those skilled in the art to further understand this utility model, preferred embodiments are described below, along with accompanying drawings, to explain in detail the composition and desired effects of this utility model. For ease of explanation, the drawings are merely illustrative to facilitate understanding, and their proportions can be adjusted according to design requirements. The vertical relationships between relative elements in the drawings described herein refer to their relative positions; therefore, all can be flipped to present the same components, and this should all fall within the scope of this specification, as stated herein.

[0027] Please refer to Figure 1 , Figure 1 An exploded view of the eyepiece optical system module of this invention is shown, illustrating the relative positions of the first housing 10, the second housing 20, and the first lens 30. This module is designed to meet the lightweight requirements of virtual reality (VR) devices, achieving wearing comfort by reducing the size of the housing. The first housing 10 serves as the display support structure and is located outside the module; the second housing 20 is responsible for fixing the first lens 30, sandwiched between the first housing 10 and the first lens 30, forming a compact structure similar to a mobile phone lens module. The assembly sequence is as follows: first, the first lens 30 is fixed to the second housing 20, and then the second housing 20 is assembled to the first housing 10. This sequence ensures stable alignment between the housings after precise lens positioning. To reduce size, the traditional single flat assembly surface is replaced by a multi-plane design, but this introduces height differences and alignment difficulties. Therefore, this invention designs a dedicated support and positioning structure, which will be described in sequence below.

[0028] Please refer to Figure 2 , Figure 2Side views of the first housing 10 and the second housing 20 are shown, and the structure of the assembly planes is defined in detail. The first housing 10 has a first assembly plane S11, a second assembly plane S12, and an inclined plane S13, which together form a first surface S1 facing the second housing 20. The second housing 20 has a first assembly plane S21, a second assembly plane S22, and an inclined plane S23, which form a second surface S2 facing the first housing 10. The first assembly planes S11 and S12 of the first housing 10 and the first assembly planes S21 and S22 of the second housing 20 can be parallel to the XY plane. However, the inclined planes S13 of the first housing 10 and S23 of the second housing 20 are not parallel to the XY plane. This results in a height difference DHSH between the first assembly planes (S11, S21) and the second assembly planes (S12, S22) in the optical axis direction (Z-axis), defined as the difference in vertical distance between the two planes on the Z-axis. It is worth noting that, ideally, after assembling the first outer shell 10 and the second outer shell 20, they should fit tightly together. Therefore, theoretically, the height difference in the Z-direction between the first assembly plane S11 and the second assembly plane S12 of the first outer shell 10 will be equal to the height difference in the Z-direction between the first assembly plane S21 and the second assembly plane S22 of the second outer shell 20. In other words, the DHSH of the first outer shell 10 will be equal to the DHSH of the second outer shell 20. The minimum thickness TSHmin of the second outer shell 20 is defined as the minimum dimension of the second outer shell 20 in the optical axis direction, and is usually measured on the assembly plane or its surrounding structure. This invention requires 1≦TSHmin / DHSH≦3, preferably 1≦TSHmin / DHSH≦2, to ensure a moderate height difference. If DHSH is too large (TSHmin / DHSH<1), the process variation increases, and the alignment structure of this invention is difficult to compensate for; if DHSH is too small (TSHmin / DHSH>3), assembly can be performed without a complex structure. This design consideration stems from the variation in the non-circular symmetrical shell of the VR module and the injection molding process. The inclined surfaces S13 and S23 are used to smooth the transition, reduce stress concentration, and improve mold life.

[0029] Please refer to Figure 3 , Figure 3 A structural schematic diagram of the first housing 10 is shown, illustrating the configuration of three support pillars 40. The support pillars 40 are disposed on the first assembly plane S11 and the second assembly plane S12, with at least one support pillar 40 located on both the first assembly plane S11 and the second assembly plane S12, ensuring stable support in the optical axis direction. Figure 3The dashed lines indicate the ranges of the first assembly plane S11, the second assembly plane S12, and the inclined plane S13. That is, the corresponding areas of the first outer shell 10 within the dashed lines correspond to the first assembly plane S11, the second assembly plane S12, and the inclined plane S13. In this embodiment, two support posts 40 are located on the first assembly plane S11, and another support post 40 is located on the second assembly plane S12. However, in other embodiments of this invention, one support post 40 may be located on the first assembly plane S11, and the other two support posts 40 may be located on the second assembly plane S12, which also falls within the scope of this invention. Preferably, the support post 40 described here is cylindrical. Furthermore, the first outer shell 10 also includes a positioning post 50 and a correction post 60, wherein the support post 40 differs in structure and function from the positioning post 50 and the correction post 60. More specifically, the support post 40 is designed to provide direct contact between the support post and the assembly surface in the Z-axis direction, replacing the previous concave-convex interlocking structure. Conventional three-point positioning designs often use cylinders with grooves, but due to height differences and manufacturing errors, the third point is often difficult to align after two points are aligned, leading to assembly failure. This invention improves upon this by having a support column contact a flat assembly surface, combined with adhesive bonding. The adhesive layer avoids the support column to prevent excess adhesive from causing eccentricity or deformation. This design reduces the number of alignment structures, simplifies mold adjustment, and reduces the size and weight of the outer shell, offering a lighter advantage compared to screw fixing. The support column configuration takes into account the asymmetry of the outer shell, ensuring balanced distribution of the three points and preventing tilting during assembly. Both the positioning column 50 and the correction column 60 have a structure where the lower half is cylindrical (rectangular in cross-section) and the upper half is a conical section with a flat top (trapezoidal in cross-section). More detailed structural and functional descriptions will follow in later paragraphs. Furthermore, the first outer shell 10 includes a groove 70 for engaging with the protrusion 72 on the second outer shell 20, facilitating computer recognition and automated assembly. Details will be further described in later paragraphs.

[0030] Please refer to Figure 4 , Figure 4The cross-sectional structure of the positioning post 50 and the correction post 60 is illustrated. The positioning post 50 is located on the first assembly plane S11 of the first outer shell 10. Its total height H1 is defined as the Z-axis distance from the surface of S11 to the top of the post. The bottom radius r1 is the radius of the circular cross-section at the bottom of the post, the top radius r2 is the radius of the circular cross-section at the top of the post, and the cylindrical height H2 is the height of the cylindrical portion of the post (i.e., the total height of the post minus the height of the conical portion). The correction post 60 is located on the second assembly plane S12. Its total height is defined as H3, the bottom radius as r3, the top radius as r4, and the cylindrical height as H4. These definitions are similar to those of the positioning post 50 and will not be repeated. It is worth noting that although in this embodiment, the positioning post 50 is located on the first assembly plane S11 and the correction post 60 is located on the second assembly plane S12, this invention is not limited to this. In other embodiments, the positioning post 50 may also be located on the second assembly plane S12 and the correction post 60 on the first assembly plane S11, which also falls within the scope of this invention.

[0031] Please refer to Figure 5 , Figure 5 A structural schematic diagram of the second outer shell 20 is shown. To clearly demonstrate the details, a flipped view (with) is used. Figure 1 (Upside down). The second outer shell 20 includes a positioning hole 52 and a correction groove 62, located on the first assembly plane S21 and the second assembly plane S22, respectively. The second outer shell 20 is thinner, so it is easier to form structures such as holes or grooves during the manufacturing process, with less material waste and lower manufacturing difficulty. In addition, the groove 70 on the first outer shell 10 and the protrusion 72 on the second outer shell 20 are interlocked, which is beneficial for computer vision recognition and automated assembly. The introduction of the groove 70 and the protrusion 72 takes into account the needs of automated production. The computer can perform preliminary positioning based on their shapes, and then perform fine alignment through the positioning post 50, positioning hole 52, correction post 60 and correction groove 62, thereby improving assembly efficiency.

[0032] Please refer to Figure 6 , Figure 6The cross-sectional structure and top view of the positioning hole and the alignment groove are shown. The positioning hole 52 is located on the first assembly plane S21 of the second housing 20. The depth Hc is the depth of the positioning hole 52 in the Z-axis direction, and the radius rc is the radius of the circular cross-section of the positioning hole 52. The alignment groove 62 is located on the second assembly plane S22 and is a semi-circular groove. The depth Hu is the depth of the alignment groove 62 in the Z-axis direction, the radius ru is the radius of the circular portion of the alignment groove 62, and Wu is the radial width from the center O of the semi-circular portion of the alignment groove 62 to the circumference of the housing (measured from the center to the boundary). The top of the semi-circular groove 62 faces the optical axis, and the bottom extends radially outward, satisfying the condition ru + Wu + 0.01 mm ≤ WH, where WH is the radial width of the second housing 20 corresponding to the position of the alignment groove 52, ensuring that a 0.01 mm width is reserved to avoid forming or assembly problems. The following conditions are met: rc and r1 satisfy 1.1 ≤ rc / r1 ≤ 1.3; Hc and H1 satisfy 1.1 ≤ Hc / H1 ≤ 1.3; ru and r3 satisfy 1.1 ≤ ru / r3 ≤ 1.3; Hu and H3 satisfy 1.1 ≤ Hu / H3 ≤ 1.3. These conditions ensure appropriate clearances and improve alignment accuracy. Specifically, too small a clearance will result in insufficient space for the positioning hole 52 or the correction groove 62, making interference likely; too large a clearance will prevent alignment due to production tolerances. After the positioning pin 50 and the positioning hole 52 are aligned, the semi-circular design of the correction groove 62 makes its Wu dimension larger than that of the correction pin 60, allowing for fine-tuning of angles and offsets, tolerating process errors, and facilitating mold finishing. The above alignment steps are similar to using a compass: first align one point (positioning pin 50 and positioning hole 52), and then fine-tune the other point (correction pin 62 and correction groove). It is worth noting that, although in this embodiment, the positioning hole 52 is located on the first assembly plane S21 and the correction groove 62 is located on the second assembly plane S22, the present invention is not limited thereto. In other embodiments, the positioning hole 52 may also be located on the second assembly plane S22 and the correction groove 62 may be located on the first assembly plane S21, which also falls within the scope of the present invention.

[0033] Additionally, please refer to Figures 3 to 6The positioning post 50 has a relatively pointed tip (preferably meeting the condition of 1.8≦r1 / r2≦5.0) to facilitate insertion into the positioning hole 52 for initial alignment in the XY direction. Specifically, if the tip is too small, the post will be difficult to insert into the hole; if it is too large, it will easily exceed the machining limit. The alignment post 60 has a relatively blunt tip (preferably meeting the condition of 1.8≦r3 / r4≦4.0) to increase the contact stability with the alignment groove 62. H1 and H3 satisfy DHSH / H1≦2.5 and DHSH / H3≦2.5 respectively to avoid insufficient post height, which could easily cause the post to slip out during assembly. H1 and H2 satisfy 1.2≦H1 / H2≦2.0, and H3 and H4 satisfy 1.2≦H3 / H4≦2.0, ensuring that the slope of the conical structure is moderate and improving the alignment success rate. Specifically, if it is too small, the slope of the conical structure of the column will be insufficient, increasing the probability of alignment failure; if it is too large, it will be difficult to position the column. The design considerations of these parameters are derived from the interview summary, emphasizing that a single set of positioning and correction structures can reduce the number of alignment elements, facilitate mold trimming and fine-tuning, and reduce the impact of variability caused by height differences.

[0034] Furthermore, it is worth noting that in the above embodiments, the first outer shell 10 includes a support post 40, a positioning post 50, a correction post 60, and a groove 70. The second outer shell 20 includes a positioning hole 52, a correction groove 62, and a protrusion 72. The purpose of forming the positioning post 50, correction post 60, positioning hole 52, correction groove 62, groove 70, and protrusion 72 is to help the first outer shell 10 and the second outer shell 20 align with each other. Although forming the perforated structure on the thinner second outer shell 20 can bring advantages such as improved yield and material saving, the present invention is not limited to this. That is, the positioning post 50 and the positioning hole 52 can be freely distributed on the first outer shell 10 and the second outer shell 20 as needed (i.e., one has a positioning post 50 and the other has a positioning hole 52). Similarly, the correction post 60, correction groove 62, groove 70, and protrusion 72 are also like this. The above variations are also within the scope of the present invention.

[0035] Please refer to Figure 7 , Figure 7 A schematic diagram of the assembled structure is shown, defining the first lens plane 82 (the plane of the first lens that is closer to the second housing 20 in the Z direction and parallel to the XY direction) and the second lens plane 84 (the plane of the first lens that is farther away from the second housing 20 in the Z direction and parallel to the XY direction). After the first lens 30 is fixed to the second housing 20, the second housing 20 is assembled with the first housing 10. The positioning post 50 and the positioning hole 52 achieve initial alignment in the XY direction, the correction post 60 and the correction groove 62 perform fine adjustment, and the three support posts 40 ensure stable support along the Z-axis. The adhesive layer (located between the first housing 10 and the second housing 20, used to bond the two housings) avoids the support posts 40 to ensure structural stability.

[0036] Please refer to Figure 8 , Figure 8 for Figure 7 The enlarged cross-sectional view shows that the DHSH range is further limited to 2.0 mm ≤ DHSH ≤ 2.5 mm, which is beneficial for ensuring that the DHSH is higher than the lens bearing surface 86, preferably more than 0.5 mm higher, to ensure lens adhesion, while being lower than the first lens plane 82 to facilitate adhesive application. The TSHmin range is further limited to 2.2 mm ≤ TSHmin ≤ 6.0 mm, which is beneficial for the second housing 20 to have a height that does not exceed the second lens plane 84 and is higher than the lens bearing surface 86. The lens bearing surface 86 is the surface on which the first lens 30 supports the second housing 20. The above features help ensure lens adhesion and avoid adhesive application difficulties. Specifically, this design prevents glue overflow from affecting optical performance while ensuring the structural strength of the second housing 20. Figure 8 The relationship between the height difference and the supporting surface is emphasized, highlighting the balance between lightweight and assembly precision in this utility model.

[0037] The definitions of the parameters of this utility model have been disclosed above, as well as the range of relationships between some parameters. When the relationships and ranges described above are satisfied, corresponding advantages can be achieved. The parameters of three embodiments of this utility model are disclosed below, as shown in Table 1. The parameters of each embodiment all fall within the ranges described above; therefore, each embodiment possesses the advantages described in the preceding paragraphs. It is worth noting that the embodiments described here are only three examples of this utility model, and this utility model is not limited thereto.

[0038] Table 1

[0039]

[0040]

[0041] In summary, the present invention is characterized in that one of the first or second outer shells has a positioning post disposed on the first assembly plane and a correction post disposed on the second assembly plane, and the other outer shell (the other of the first or second outer shells) has a positioning hole disposed on the first assembly plane and a correction groove disposed on the second assembly plane. The first and second outer shells together comprise only a single positioning post, a positioning hole, a correction post, a correction groove, and three support posts. The correction groove is a semi-circular groove with its top extending radially to accommodate forming errors, facilitating mold trimming and fine-tuning. The other three support posts are disposed on the first and second assembly planes of the first or second outer shell, directly supporting the components along the optical axis. An adhesive layer is disposed between the first and second outer shells, avoiding the support posts, effectively reducing the module size and preventing adhesive overflow between the support posts and the assembly plane, thus avoiding eccentricity or deformation. This design achieves precise alignment in the XY directions and allows for fine-tuning through the gaps in the correction groove, improving assembly accuracy and yield. To address the height difference issue arising from the reduced size of VR module housings at the assembly surfaces, a three-point support structure combined with a single set of positioning and correction structures is designed to replace the traditional multi-point alignment structure. This reduces the number of alignment structures, facilitates adjustments to the mold structure to accommodate variations caused by height differences at the assembly surfaces, and lowers the risk of alignment failures due to process errors. This design is particularly suitable for lightweight VR modules. Furthermore, this invention specifies certain parameter conditions; when these conditions are met, a suitable height difference is ensured, making the newly designed structure suitable for alignment and assembly, and improving assembly yield and quality.

[0042] The above description is only a preferred embodiment of the present utility model. All equivalent changes and modifications made within the scope of the claims of the present utility model shall be covered by the present utility model.

Claims

1. An eyepiece optical system module, characterized in that, include: The first outer shell, A second outer casing is disposed on the first outer casing. A first lens is mounted on the second housing. The first housing and the second housing each have a first assembly plane and a second assembly plane, and satisfy the following condition: 1≦TSHmin / DHSH≦3, where DHSH is the height difference between the first assembly plane and the second assembly plane in one optical axis direction, and TSHmin is the minimum thickness of the second housing; Three support posts are disposed on the first assembly plane and the second assembly plane of the first housing or the second housing, and the first housing or the second housing is directly supported by only the three support posts in the optical axis direction; An adhesive layer is disposed between the first outer shell and the second outer shell, and the adhesive layer avoids the three supporting pillars; The first housing or the second housing has a positioning post disposed on the first assembly plane and a correction post disposed on the second assembly plane, and the other housing has a positioning hole disposed on the first assembly plane and a correction groove disposed on the second assembly plane. The first housing and the second housing together contain only one positioning post, one positioning hole, one correction post and one correction groove. The correction groove is a semi-circular groove, and one end of the semi-circle extends radially to accommodate forming errors.

2. The eyepiece optical system module as claimed in claim 1, further satisfying the following condition: DHSH / H1 ≦ 2.5, where H1 is a total height of the positioning post.

3. The eyepiece optical system module as claimed in claim 1, further satisfying the following condition: DHSH / H3 ≤ 2.5, where H3 is a total height of the correction post.

4. The eyepiece optical system module as claimed in claim 1, wherein the first housing or the second housing respectively has a groove and a protrusion.

5. The eyepiece optical system module as claimed in claim 1, further satisfying the following condition: 1.1 ≦rc / r1 ≦1.3, where rc is a radius of the positioning hole and r1 is a radius of a bottom surface of the positioning post.

6. The eyepiece optical system module as claimed in claim 1, further satisfying the following condition: 1.8 ≦ r1 / r2 ≦ 5.0, where r1 is a radius of a bottom surface of the positioning post and r2 is a radius of a top surface of the positioning post.

7. The eyepiece optical system module as claimed in claim 1, further satisfying the following condition: 1.1 ≤ Hc / H1 ≤ 1.3, where Hc is a depth of the positioning hole and H1 is a total height of the positioning post.

8. The eyepiece optical system module as claimed in claim 1, further satisfying the following condition: 1.2 ≤ H1 / H2 ≤ 2.0, where H1 is a total height of the positioning post and H2 is a height of a cylindrical portion of the positioning post.

9. The eyepiece optical system module as claimed in claim 1, further satisfying the following condition: 1.1 ≦ru / r3 ≦1.3, where ru is a radius of the correction groove and r3 is a radius of a bottom surface of the correction post.

10. The eyepiece optical system module of claim 1, further satisfying the following condition: 1.8 ≤ r3 / r4 ≤ 4.0, where r3 is a radius of a bottom of the correction post and r4 is a radius of a top surface of the correction post.

11. The eyepiece optical system module of claim 1, further satisfying the following condition: 1.1 ≦ Hu / H3 ≦ 1.3, where Hu is a depth of the correction groove and H3 is a total height of the correction post.

12. The eyepiece optical system module of claim 1, further satisfying the following condition: 1.2 ≤ H3 / H4 ≤ 2.0, where H3 is a total height of the correction post and H4 is a height of a cylindrical portion of the correction post.

13. The eyepiece optical system module of claim 1, further satisfying the following condition: ru + Wu + 0.01 mm ≤ WH, where ru is a radius of the correction groove, WH is the width of the first housing or the second housing in a radial direction corresponding to the position of the correction groove, and Wu is the width in the radial direction from the center of the correction groove to the circumference of the first housing or the second housing.

14. The eyepiece optical system module of claim 1, wherein the following condition is further satisfied: 2.2 mm ≤ TSHmin ≤ 6.0 mm.

15. The eyepiece optical system module of claim 1, wherein the following condition is further satisfied: 2.0 mm ≤ DHSH ≤ 2.5 mm.

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