Eyepiece optical module

Abstract

The invention provides an eyepiece optical module. The eyepiece optical module comprises a shell and a strip-shaped flexible circuit board, the flexible circuit board is provided with a plurality of light-emitting units facing the eye side, and the flexible circuit board is provided with a first transverse width direction and a first longitudinal length direction. The shell is provided with an inner side wall facing the inside of the eyepiece optical module, a plurality of connecting units bonded with the flexible circuit board are arranged on the inner side wall, and the positions of the connecting units are respectively arranged corresponding to the light-emitting units. Each connecting unit is provided with a glue storage groove capable of storing glue, a plurality of soft board supporting parts arranged around the glue storage groove and an inner limiting column arranged in the first transverse width direction. The flexible circuit board is provided with an inner flexible board limiting part corresponding to each inner limiting column, and the inner limiting columns and the inner flexible board limiting parts are matched with each other and are limited in the first lengthwise direction.

Description

Technical Field

[0001] The present invention relates to an optical module, and more particularly to an eyepiece optical module. Background Art

[0002] Virtual reality (VR) uses computer technology to simulate a three-dimensional world, offering users visual, auditory, and other sensory experiences. To create a truly immersive experience, it's often paired with eye-tracking technology. A light source within the eyepiece's optical module tracks and detects the viewer's pupils, determining their current gaze direction.

[0003] This light source is typically mounted on a flexible printed circuit (FPC). Because it needs to connect to external components, it often experiences strain during assembly, causing components to fall off. Furthermore, it can easily fall off due to insufficient adhesion after undergoing high-temperature and high-humidity reliability testing, reducing the reliability of the eyepiece optical module. Therefore, how to position a FPC with a light source on an eyepiece optical module and increase the bonding strength between the two remains a challenge that needs improvement. Summary of the Invention

[0004] The present invention provides an eyepiece optical module, the structure of which helps to improve the adhesion between the housing and the flexible circuit board, and can improve the positioning accuracy of the flexible circuit board and the light-emitting unit thereon, thereby improving the assembly accuracy of the eyepiece optical module.

[0005] One embodiment of the present invention provides an eyepiece optical module, comprising a housing and a flexible circuit board in the shape of an elongated strip. A plurality of light-emitting units facing the eye side are provided on the flexible circuit board, and the flexible circuit board has a first transverse width direction and a first longitudinal length direction. The housing has an inner side wall facing the interior of the eyepiece optical module, and a plurality of connection units bonded to the flexible circuit board are provided on the inner side wall, and the positions of these connection units correspond to the settings of these light-emitting units. Each connection unit is provided with a glue storage tank for storing glue, a plurality of soft board support parts provided around the glue storage tank, and an inner limit column provided along the first transverse width direction. The glue storage tank includes a long glue storage section provided along the first longitudinal length direction and a short glue storage section provided along the first transverse width direction. The flexible circuit board is provided with an inner soft board limiting part corresponding to each inner limit column, and the inner limit column and the inner soft board limiting part cooperate with each other to limit in the first longitudinal length direction.

[0006] One embodiment of the present invention provides an eyepiece optical module, comprising a housing and a flexible circuit board in the shape of an elongated strip. The flexible circuit board is provided with a plurality of light-emitting units facing the eye side, and the flexible circuit board has a first transverse width direction and a first longitudinal length direction. The housing has an inner side wall facing the interior of the eyepiece optical module and a peripheral portion connected to the inner side wall. A plurality of connection units bonded to the flexible circuit board are provided on the inner side wall, and the positions of these connection units correspond to these light-emitting units. Each connection unit has a glue storage tank and an inner limit column provided along the first transverse width direction. The flexible circuit board is provided with an inner soft board limit portion corresponding to each inner limit column. The inner limit column cooperates with the inner soft board limit portion to limit the position in the first longitudinal length direction. The peripheral portion has a soft board passing portion for allowing the flexible circuit board to pass outward from the inner side wall. The soft board passing portion has a glue storage tank and a plurality of peripheral limit columns provided along the second transverse width direction of the flexible circuit board. The flexible circuit board is provided with a plurality of peripheral flexible circuit board limiting parts corresponding to the peripheral limiting pillars. The peripheral limiting pillars cooperate with the peripheral flexible circuit board limiting parts to limit the flexible circuit board in the second longitudinal direction of the flexible circuit board.

[0007] In an eyepiece optical module according to an embodiment of the present invention, a plurality of light-emitting units facing the eye side are provided on the flexible circuit board to provide a light source. Furthermore, the outer shell has an inner sidewall facing the interior of the eyepiece optical module, and a plurality of connection units for bonding the flexible circuit board are provided on the inner sidewall. The positions of these connection units correspond to the positions of these light-emitting units, which facilitates positioning of each light-emitting unit. Furthermore, each connection unit is provided with a glue storage tank and an internal limiting post. Glue can be stored in the glue storage tank, which can increase the bonding force when the flexible circuit board is bent. By optimizing the bonding area, the adhesion between the outer shell and the flexible circuit board is improved, preventing the flexible circuit board from falling off. The internal limiting post is provided along the first transverse width direction, and the flexible circuit board is provided with an internal flexible circuit board limiting portion corresponding to the internal limiting post. The internal limiting post cooperates with the internal flexible circuit board limiting portion to generate a limiting function for the flexible circuit board in the first longitudinal direction, preventing the flexible circuit board and the light-emitting unit from shifting along the first longitudinal direction, thereby improving positioning accuracy and, in turn, improving the assembly accuracy of the eyepiece optical module. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 FIG. 1 is a perspective schematic diagram of an eyepiece optical module according to a first embodiment of the present invention.

[0009] Figure 2 for Figure 1 Exploded diagram of the eyepiece optical module.

[0010] Figure 3 for Figure 2 A three-dimensional schematic diagram of the shell.

[0011] Figure 4 for Figure 2 Schematic side view of the housing in FIG.

[0012] Figure 5 for Figure 2 Schematic diagram of the front view of the shell.

[0013] Figure 6 for Figure 2 A schematic front view of the housing and the flexible printed circuit board assembled together.

[0014] Figure 7 for Figure 2 Schematic cross-section of the housing and flexible printed circuit board.

[0015] Figure 8 FIG. 1 is a partially enlarged view of a connection unit of a housing in an eyepiece optical module according to a second embodiment of the present invention.

[0016] Figure 9 FIG. 1 is a partially enlarged view of a connection unit of a housing in an eyepiece optical module according to a third embodiment of the present invention.

[0017] Figure 10 FIG. 1 is a partial enlarged view of a flexible board passing portion of a housing in an eyepiece optical module according to a fourth embodiment of the present invention.

[0018] Description of reference numerals:

[0019] 100: eyepiece optical module; 120: lens;

[0020] 130, 150: glue; 140: lens holder; 160: display unit;

[0021] 200: housing; 210: inner wall; 220: connecting unit;

[0022] 221, 242: glue storage tank; 222: long glue storage section; 223, 246: soft board support part;

[0023] 224: short rubber storage section; 225: inner limit column; 226: long soft board support portion; 228, 228': short soft board support portion;

[0024] 230: peripheral portion; 240: soft board passing portion; 244: peripheral limit column;

[0025] 300: flexible circuit board; 310: light-emitting unit; 320: inner soft board limiter; 330: peripheral soft board limiter;

[0026] A1: eye side; A2: display side;

[0027] D1: first transverse direction; D2: first longitudinal direction; D3: second transverse direction; D4: second longitudinal direction;

[0028] Dg: maximum depth; Lip, Lpp, Lss: maximum length; Th: minimum thickness;

[0029] Wip, Wlg, Wls, Wpp: maximum width; Wifx, Wsfx: minimum width. DETAILED DESCRIPTION

[0030] Figure 1 is a three-dimensional schematic diagram of an eyepiece optical module according to a first embodiment of the present invention, Figure 2 for Figure 1 Exploded diagram of the eyepiece optical module. Figure 3 for Figure 2 A three-dimensional schematic diagram of the shell in Figure 4 for Figure 2 A schematic side view of the housing in FIG. Figure 5 for Figure 2 A schematic front view of the housing in FIG. Figure 6 for Figure 2 A schematic diagram showing the front view of the housing and the flexible printed circuit board assembled together. Figure 7 for Figure 2 Please refer to the cross-sectional diagram of the housing and flexible printed circuit board. Figures 1 to 7 The eyepiece optical module 100 of this embodiment includes a housing 200 and a long strip of flexible circuit board 300. In this embodiment, the flexible circuit board 300 is, for example, a flexible printed circuit board (FPC). The flexible circuit board 300 is provided with a plurality of light emitting units 310 (such as Figure 6 (as shown), and the flexible printed circuit board 300 has a first transverse width D1 and a first longitudinal length D2. The housing 200 has an inner sidewall 210 facing the interior of the eyepiece optical module 100. A plurality of connecting units 220 bonded to the flexible printed circuit board 300 are disposed on the inner sidewall 210, and the positions of these connecting units 220 correspond to the positions of the light-emitting units 310.

[0031] Each connecting unit 220 includes a glue storage tank 221 for storing glue, a plurality of flexible circuit board support portions 223 disposed around the glue storage tank 221, and an internal limiting post 225 disposed along the first transverse width direction D1. The glue storage tank 221 includes a long glue storage section 222 disposed along the first longitudinal direction D2 and a short glue storage section 224 disposed along the first transverse width direction D1. The flexible circuit board 300 is provided with an internal flexible circuit board limiting portion 320 corresponding to each internal limiting post 225. The internal limiting post 225 and the internal flexible circuit board limiting portion 320 cooperate with each other to limit the position in the first longitudinal direction D2. In this embodiment, the internal flexible circuit board limiting portion 320 is, for example, a notch in the flexible circuit board 300.

[0032] In this embodiment, the eyepiece optical module 100 includes a lens 120, an adhesive 130, a lens holder 140, an adhesive 150, a flexible printed circuit board 300, and a housing 200, which are arranged in sequence from the eye side A1 to the display side A2. A display unit 160 is disposed on the display side A2 of the housing 200. The lens 120 is fixed to the lens holder 140 via the adhesive 130, and the lens holder 140 is fixed to the housing 200 via the adhesive 150. In this embodiment, the light-emitting unit 310 is a light-emitting diode, such as an infrared light-emitting diode. The display unit 160 is, for example, an organic light-emitting diode (OLED) display, a liquid crystal display, a liquid-crystal-on-silicon (LCOS) panel, a digital micro-mirror device (DMD), a micro light-emitting diode display, or other suitable display. The eyepiece optical module 100 of this embodiment is used to form an image by transmitting an imaging light beam from the display unit 160 through the eyepiece optical module 100 into the viewer's eye. In this embodiment, the light emitting unit 310 emits infrared light, which is then transmitted through the lens 120 to illuminate the user's eye located on the eye side A1, providing sufficient light for the infrared camera used to track the user's pupil.

[0033] In this embodiment, the housing 200 further includes a peripheral portion 230 connected to the inner sidewall 210. The peripheral portion 230 includes a flexible circuit board passage portion 240 for allowing the flexible circuit board 300 to pass outward from the inner sidewall 210. The flexible circuit board passage portion 240 includes a glue storage tank 242 and a plurality of peripheral limit posts 244 arranged along a second transverse width direction D3 of the flexible circuit board 300. The flexible circuit board 300 is provided with a plurality of peripheral flexible circuit board limit portions 330 (such as Figure 6 As shown, the peripheral limiting posts 244 cooperate with the peripheral flexible circuit board limiting portions 330 to limit the flexible circuit board 300 in a second longitudinal direction D4 of the flexible circuit board 300. In this embodiment, the peripheral flexible circuit board limiting portion 330 is, for example, a notch in the flexible circuit board 300.

[0034] In this embodiment, the first transverse direction D1 and the first longitudinal direction D2 refer to the transverse direction and the longitudinal direction of the portion of the flexible printed circuit on the inner wall 210, respectively, and the second transverse direction D3 and the second longitudinal direction D4 refer to the transverse direction and the longitudinal direction of the portion of the flexible printed circuit on the flexible printed circuit through portion 240, respectively.

[0035] In the eyepiece optical module 100 of this embodiment, a plurality of light-emitting units 310 are disposed on the flexible printed circuit board 300, facing the eye side A1, to provide light. Furthermore, the housing 200 has an inner sidewall 210 facing the interior of the eyepiece optical module 100. A plurality of connecting units 220 for bonding the flexible printed circuit board 300 are disposed on the inner sidewall 210. These connecting units 220 are positioned correspondingly to the light-emitting units 310, facilitating positioning of each light-emitting unit 310. Furthermore, each connecting unit 220 has a glue reservoir 221, a plurality of flexible printed circuit board support portions 223, and an internal stopper 225. Glue is stored in the glue reservoir 221. The reservoir 221 includes a long glue storage section 222 along the first longitudinal direction D2 of the flexible printed circuit board 300, which adheres to the majority of the flexible printed circuit board 300. A short glue storage section 224, along the first transverse direction D1 of the flexible printed circuit board 300, increases bonding strength when the flexible printed circuit board 300 is bent. By optimizing the bonding area, the adhesion between the housing 200 and the flexible printed circuit board 300 is enhanced, preventing the flexible printed circuit board 300 from falling off. Furthermore, the flexible printed circuit board supports 223 provide support for the flexible printed circuit board 300 and help maintain a uniform glue thickness. These flexible printed circuit board supports 223 are arranged around the reservoir 221 to maintain sufficient glue storage area. The inner limiting posts 225 are arranged along the first transverse direction D1, and the flexible printed circuit board 300 is provided with an inner flexible printed circuit board limiting portion 320 corresponding to the inner limiting posts 225. The inner limiting posts 225 cooperate with the inner flexible printed circuit board limiting portion 320 to limit the flexible printed circuit board 300 in the first longitudinal direction D2, preventing the flexible printed circuit board 300 and the light-emitting unit 310 from moving along the first longitudinal direction D2. This improves positioning accuracy and, consequently, the assembly accuracy of the eyepiece optical module 100. Compared to conventional eyepiece optical modules, which are prone to falling off due to insufficient adhesion after undergoing an on-going reliability test (ORT test), thus reducing the reliability of the eyepiece optical module, the eyepiece optical module 100 of this embodiment can alleviate this problem through the above-mentioned structure, making the flexible printed circuit board less likely to fall off, thereby effectively improving the reliability of the eyepiece optical module 100.

[0036] Furthermore, in conventional eyepiece optical modules, a flexible printed circuit board (FPCB) typically needs to pass through the outer shell from the inside to connect to other components. If the passage portion of the outer shell for the FPCB to pass through is flat, the FPCB can be displaced due to the tension generated during assembly, causing other components to fall off. Therefore, this embodiment designs an eyepiece optical module 100 to overcome this problem. In this embodiment of the eyepiece optical module 100, the outer shell 200 further includes a peripheral portion 230 connected to the inner sidewall 210. The FPCB 300 is secured to the inner sidewall 210 via the adhesive reservoirs 221 on the connecting units 220. Internal FPCB stoppers 320 are provided corresponding to the internal stop posts 225. These two portions cooperate to prevent displacement of the FPCB 300 and the light-emitting unit 310 along the first longitudinal direction D2, thereby achieving a limiting function. Furthermore, the FPCB 300 is passed through the outer shell via the FPCB passage portion 240 to connect to external components. The flexible circuit board passage 240 has a glue reservoir 242 that secures the flexible circuit board 300. It also has a plurality of peripheral retaining posts 244 arranged along the second transverse direction D3. Corresponding to these peripheral retaining posts 244, the flexible circuit board 300 is provided with a plurality of peripheral flexible circuit board retaining portions 330. These peripheral retaining posts 244 cooperate to retain the flexible circuit board 300 in the second longitudinal direction D4. In this embodiment, the combination of the internal retaining posts 225 and the peripheral retaining posts 244 further prevents the flexible circuit board 300 from shifting due to pulling during assembly, which could cause other components connected to the flexible circuit board 300 to fall off.

[0037] In this embodiment, each connection unit 220 meets the following requirements:

[0038] 60% ≦ Total area of these soft board supports / Total area of glue storage tank ≦ 70% Formula (1)

[0039] In this embodiment, the total area of the soft board support portions in formula (1) refers to the total area of the soft board support portions 223, and the total area of the glue storage tanks refers to the total area of the glue storage tanks 221. If the total area of the soft board support portions 223 is too large (for example, the ratio in formula (1) exceeds the upper limit of 70%), the area of the glue storage tanks 221 will be insufficient, thereby reducing the adhesive force. If the total area of the soft board support portions 223 is too small (for example, the ratio in formula (1) is less than the lower limit of 60%), the connecting unit 220 may be easily damaged during assembly and pressing.

[0040] In this embodiment, the eyepiece optical module 100 complies with:

[0041] 6.000≦Th / Dg≦7.000 Formula (2)

[0042] Where Th is the minimum thickness of the housing 200 corresponding to the glue reservoir 221, and Dg is the maximum depth of the glue reservoir 221. If the ratio Th / Dg is too large, the glue reservoir 221 is too shallow, leaving too little space for the glue, which can easily cause glue to squeeze out during assembly of the flexible printed circuit board 300. If this ratio is too small, the glue reservoir 221 is too deep, resulting in a thinner housing 200 and insufficient strength.

[0043] In this embodiment, the flexible circuit board support portions 223 include at least one long flexible circuit board support portion 226 arranged along the first longitudinal direction D2 and one short flexible circuit board support portion 228 arranged along the first transverse direction D1. The long flexible circuit board support portion 226 corresponds to the long adhesive storage section 222, providing support for the flexible circuit board 300 in the first longitudinal direction D2 and maintaining its conformability to the housing 200. The short flexible circuit board support portion 228 corresponds to the short adhesive storage section 224, providing support in the first transverse direction D1 and preventing deformation of the flexible circuit board 300 during bending.

[0044] In this embodiment, the eyepiece optical module 100 complies with:

[0045] 1.500≦Wlg / Wls≦2.000 Formula (3)

[0046] Where Wlg is the maximum width of the long glue storage section 222 in the first transverse direction D1, and Wls is the maximum width of the long flexible circuit board support portion 226 in the first transverse direction D1. If the ratio Wlg / Wls is too large, the width of the long flexible circuit board support portion 226 is too small, resulting in insufficient strength and easy damage. There is also insufficient area for the flexible printed circuit board 300 to support it, making it difficult to adhere to the adhesive during dispensing, reducing assembly accuracy. If this ratio is too small, the width of the long glue storage section 222 is too small, resulting in insufficient area for the glue reservoir 221 and reduced adhesion.

[0047] In this embodiment, the inner limiting post 225 is positioned near the short flexible circuit board support portion 228. This design helps optimize the area of the glue reservoir 221 and increase adhesion. Preferably, the inner limiting post 225 can be positioned on the short flexible circuit board support portion 228. The short flexible circuit board support portion 228 stabilizes the glue height and provides support for the flexible circuit board 300, allowing the flexible circuit board 300 to be better secured to the connecting unit 220. This reduces deformation during positioning and improves positioning accuracy.

[0048] In this embodiment, the eyepiece optical module 100 complies with:

[0049] 2.650≦Ls s / Lip≦5.800 Formula (4)

[0050] Where Lss is the maximum length of the short flexible circuit board support portion 228 in the first longitudinal direction D2, and Lip is the maximum length of the inner limiting post 225 in the first longitudinal direction D2. If the ratio Lss / Lip is too large, the inner limiting post 225 will be too short, lacking strength and easily damaged, thus losing its limiting function. If this ratio is too small, the short flexible circuit board support portion 228 will be too short, lacking strength and easily damaged, and lacking sufficient area for the flexible printed circuit board 300 to rest on, making it difficult to adhere to the adhesive during dispensing, resulting in reduced assembly accuracy.

[0051] In this embodiment, the peripheral limiting posts 244 are symmetrically arranged in the second transverse width direction D3. With such a design, when the flexible printed circuit board 300 passes over the housing 200 and is connected to other parts, the tensile force generated during assembly can be evenly distributed, achieving a better limiting effect.

[0052] In this embodiment, the eyepiece optical module 100 complies with:

[0053] 3.350≦Wsfx / Wpp≦5.650 Formula (5)

[0054] Where Wpp is the maximum width of any peripheral limiting column 244 in the second transverse width direction D3 (eg Figure 5 Ws fx is the minimum width of the flexible circuit board 300 in the second transverse direction D3 (as shown in FIG. Figure 6 If the width of the peripheral limiting posts 244 in the second transverse direction D3 is too large, the corresponding peripheral flexible circuit board limiting portion 330 will be too large, resulting in the flexible circuit board 300 having a width in the second transverse direction D3 that is too small, making it difficult to manufacture. If the width of the peripheral limiting posts 244 in the second transverse direction D3 is too small, the flexible circuit board 300 cannot be limited in position, and the effectiveness of the embodiments of the present invention cannot be achieved.

[0055] In this embodiment, the eyepiece optical module 100 complies with:

[0056] 1.350≦Wpp / Lpp≦1.600 Formula (6)

[0057] Wherein Wpp is the maximum width of any peripheral limit column 244 in the second transverse width direction D3, and Lpp is the maximum length of any peripheral limit column 244 in the second longitudinal direction D4 (e.g. Figure 5 When the Wpp / Lpp ratio is too large, the length of the peripheral limit post 244 in the second longitudinal direction D4 is too small. This leads to insufficient strength of the peripheral limit post 244, which is easily damaged during assembly and loses its position-limiting function. When the ratio is too small, the width of the peripheral limit post 244 in the second transverse direction D3 is too small, and the flexible printed circuit board 300 cannot be limited in position, thus failing to achieve the desired effect of the embodiments of the present invention.

[0058] In this embodiment, the flexible circuit board passing portion 240 has a plurality of flexible circuit board support portions 246 disposed around the glue storage slots 242. These flexible circuit board support portions 223, 246 are disposed around the glue storage slots 221, 242 to provide support for the flexible circuit board 300 and facilitate positioning of the light emitting unit 310.

[0059] In this embodiment, the peripheral limiting posts 244 are mounted on the flexible circuit board support portions 246. This design optimizes the area of the glue reservoir 242 and increases adhesive strength. By maintaining the glue level and providing support for the flexible circuit board 300, the flexible circuit board 300 is better secured to the flexible circuit board through portion 240 when connected to external components, minimizing deformation.

[0060] In this embodiment, the eyepiece optical module complies with:

[0061] 1.650≦Wifx / Wip≦1.850 formula (7)

[0062] Where Wip is the maximum width of the inner limiting column 225 in the first transverse width direction D1 (eg Figure 5 As shown in FIG, the minimum width of the Wifx flexible circuit board 300 in the first transverse direction D1 (eg Figure 6 If the width of the inner limiting post 225 in the first transverse width direction D1 is too wide, the size of the corresponding inner flexible circuit board limiting portion 320 will be too large, resulting in the width of the flexible circuit board 300 in the first transverse width direction D1 being too narrow, making it difficult to manufacture. If the width of the inner limiting post 225 in the first transverse width direction D1 is too narrow, the flexible circuit board 300 cannot be limited in position, and the effectiveness of the embodiments of the present invention cannot be achieved.

[0063] In this embodiment, the eyepiece optical module complies with:

[0064] 1.100≦Wip / Lip≦1.450 formula (8)

[0065] Where Lip is the maximum length of the inner limiting post 255 in the first longitudinal direction D2, and Wip is the maximum width of the inner limiting post 255 in the first transverse direction D1. If the ratio Wip / Lip is too large, the length of the inner limiting post 255 in the first longitudinal direction D2 will be too small, resulting in insufficient strength of the inner limiting post 255, which may be easily damaged and lose its limiting function. If this ratio is too small, the width of the inner limiting post 255 in the first transverse direction D1 will be too small, and the flexible printed circuit board 300 will not be able to be limited, thus failing to achieve the desired effect of the embodiments of the present invention.

[0066] Figure 8 This is a partial enlarged view of the connection unit of the housing in the eyepiece optical module of the second embodiment of the present invention. Figure 8The eyepiece optical module of this embodiment is similar to the eyepiece optical module 100 of the first embodiment, and the difference between the two is that, in the connecting unit 220 of this embodiment, the inner limit position 225 is configured on one side of the short soft board support portion 228, but is not set on the short soft board support portion 228.

[0067] Figure 9 This is a partial enlarged view of the connection unit of the housing in the eyepiece optical module of the third embodiment of the present invention. Figure 9 The eyepiece optical module of this embodiment is similar to the eyepiece optical module 100 of the first embodiment, and the main differences between the two are as follows. Figure 3 In addition to the long soft board support portion 226 and the short soft board support portion 228, the soft board support portion 223 also includes another short soft board support portion 228', which is arranged along the first longitudinal direction D2 with the short soft board support portion 228 and along the first transverse direction D1 with the long soft board support portion 226. Figure 9 In this embodiment, the soft board support portion 223 includes a long soft board support portion 226 and a short soft board support portion 228, but does not include Figure 3 Another short soft board supporting portion 228'.

[0068] Figure 10 This is a partial enlarged view of the soft board passing portion of the housing in the eyepiece optical module of the fourth embodiment of the present invention. Figure 10 The eyepiece optical module of this embodiment is similar to the eyepiece optical module 100 of the first embodiment, with the following key differences. In the flexible board passing portion 240 of this embodiment, the peripheral limit posts 244 are not symmetrically arranged along the second transverse width direction D3. Furthermore, the flexible board support portions 246 are also not symmetrically arranged along the second transverse width direction D3.

[0069] The eyepiece optical modules of the second embodiment, the third embodiment, and the fourth embodiment can also comply with the above equations (1) to (8). Table 1 below lists examples of various parameter values of the first to fourth embodiments.

[0070] Table 1

[0071] parameter First embodiment Second embodiment Third embodiment Fourth embodiment Wip(mm) 1.137 1.137 1.140 1.130 Lpp(mm) 0.380 0.400 0.370 0.370 Wifx(mm) 2.091 2.000 1.900 2.000 Wlg(mm) 0.900 0.850 0.950 0.930 Wls(mm) 0.530 0.550 0.500 0.520 Wlg / Wls 1.698 1.545 1.900 1.788 Wifx / Wip 1.839 1.759 1.667 1.770 Wpp(mm) 0.570 0.550 0.580 0.530 Wsfx(mm) 1.980 2.000 1.960 2.980 Wsfx / Wpp 3.474 3.636 3.379 5.623 Lip(mm) 0.800 0.900 1.000 0.830 Lss(mm) 3.230 2.400 5.779 3.250 Lss / Lip 4.037 2.667 5.779 3.916 Wip / Lip 1.421 1.263 1.140 1.361 Wpp / Lpp 1.500 1.375 1.568 1.432 Th(mm) 1.100 1.110 1.070 1.080 Dg(mm) 0.170 0.163 0.177 0.175 Th / Dg 6.471 6.810 6.045 6.171

[0072] However, the present invention is not limited to the numerical values of the parameters in Table 1. In other embodiments, these parameters may have other numerical values.

[0073] In summary, in the eyepiece optical module of an embodiment of the present invention, a plurality of light-emitting units facing the eye side are provided on the flexible circuit board to provide a light source. Furthermore, the housing has an inner sidewall facing the interior of the eyepiece optical module. A plurality of connection units for bonding the flexible circuit board are provided on the inner sidewall. These connection units are positioned correspondingly to the light-emitting units, facilitating the positioning of each light-emitting unit. Furthermore, each connection unit is provided with a glue reservoir and an internal limiting post. Glue can be stored in the glue reservoir, increasing the bonding force when the flexible circuit board is bent. By optimizing the bonding area, the adhesion between the housing and the flexible circuit board is improved, preventing the flexible circuit board from falling off. The internal limiting post is provided along a first transverse width, and an internal flexible circuit board limiting portion is provided on the flexible circuit board corresponding to the internal limiting post. The internal limiting post cooperates with the internal flexible circuit board limiting portion to limit the flexible circuit board in the first longitudinal direction, preventing the flexible circuit board and the light-emitting unit from shifting along the first longitudinal direction. This improves positioning accuracy, thereby enhancing the assembly accuracy of the eyepiece optical module.

Claims

1. An eyepiece optical module, characterized in that: include: a shell; as well as A long strip-shaped flexible circuit board is provided with a plurality of light-emitting units facing the eye side. The flexible circuit board has a first horizontal width direction and a first vertical length direction. The housing has an inner sidewall facing the interior of the eyepiece optical module, and a plurality of connection units bonded to the flexible printed circuit board are disposed on the inner sidewall, and the positions of the connection units correspond to the positions of the light-emitting units. Each connecting unit is provided with a glue storage tank for storing glue, a plurality of soft board support parts arranged around the glue storage tank, and an inner limit column arranged along the first transverse width direction; The glue storage tank comprises a long glue storage section arranged along the first longitudinal direction and a short glue storage section arranged along the first transverse direction; The flexible circuit board is provided with an inner flexible board limiting portion corresponding to each inner limiting column. The inner limiting column and the inner flexible board limiting portion cooperate with each other to limit the position in the first longitudinal direction.

2. The eyepiece optical module according to claim 1, wherein each connecting unit satisfies the following relationship: 60%≦total area of the flexible board supporting portions / total area of the glue storage tank≦70%.

3. The eyepiece optical module as claimed in claim 1 , wherein the eyepiece optical module meets 6.000≦Th / Dg≦7.000, wherein Th is the minimum thickness of the housing corresponding to the glue storage tank, and Dg is the maximum depth of the glue storage tank.

4. The eyepiece optical module as claimed in claim 1, wherein the soft board support portions include at least one long soft board support portion disposed along the first longitudinal direction and one short soft board support portion disposed along the first transverse direction.

5. The eyepiece optical module as claimed in claim 4, wherein the eyepiece optical module meets 1.500≦Wlg / Wls≦2.000, wherein Wlg is the maximum width of the long glue storage section in the first transverse width direction, and Wls is the maximum width of the long soft board support portion in the first transverse width direction.

6. The eyepiece optical module as claimed in claim 4, wherein the inner limiting post is arranged close to the short soft board supporting portion.

7. The eyepiece optical module as claimed in claim 4, wherein the eyepiece optical module meets 2.650≦Lss / Lip≦5.800, wherein Lss is the maximum length of the short soft board support portion in the first longitudinal direction, and Lip is the maximum length of the inner limit post in the first longitudinal direction.

8. An eyepiece optical module, characterized in that: include: a shell; as well as A long strip-shaped flexible circuit board is provided with a plurality of light-emitting units facing the eye side. The flexible circuit board has a first horizontal width direction and a first vertical length direction. The housing has an inner sidewall facing the interior of the eyepiece optical module and a peripheral portion connected to the inner sidewall. A plurality of connection units bonded to the flexible printed circuit board are disposed on the inner sidewall, and the connection units are positioned corresponding to the light-emitting units. Each connecting unit has a glue storage tank and an inner limiting post arranged along the first transverse width direction. The flexible printed circuit board is provided with an inner flexible board limiting portion corresponding to each inner limiting post. The inner limiting post cooperates with the inner flexible board limiting portion to limit the flexible printed circuit board in the first longitudinal direction. The peripheral portion has a flexible circuit board passing portion that allows the flexible circuit board to pass outward from the inner side wall. The flexible circuit board passing portion has a glue storage tank and a plurality of peripheral limit posts arranged along a second transverse width direction of the flexible circuit board. The flexible circuit board is provided with a plurality of peripheral flexible circuit board limiting portions corresponding to these peripheral limit posts. The peripheral limit posts cooperate with the peripheral soft circuit board limiting portions to limit the flexible circuit board in a second longitudinal direction of the flexible circuit board. 9 . The eyepiece optical module as claimed in claim 8 , wherein the peripheral limiting posts are symmetrically arranged in the second transverse width direction.

10. The eyepiece optical module of claim 8, wherein the eyepiece optical module satisfies 3.350≦Wsfx / Wpp≦5.650, wherein Wpp is the maximum width of any of the peripheral limiting posts in the second transverse direction, and Wsfx is the minimum width of the flexible printed circuit board in the second transverse direction.

11. The eyepiece optical module according to claim 8, wherein the eyepiece optical module meets 1.350≦Wpp / Lpp≦1.600, wherein Wpp is the maximum width of any of the peripheral limiting posts in the second transverse direction, and Lpp is the maximum length of any of the peripheral limiting posts in the second longitudinal direction.

12. The eyepiece optical module as claimed in claim 8, wherein the flexible board passing portion and each connecting unit have a plurality of flexible board supporting portions disposed around the glue storage tank. 13 . The eyepiece optical module as claimed in claim 12 , wherein the peripheral limiting posts are disposed on the soft board supporting portions.

14. The eyepiece optical module according to claim 1 or 8, wherein the eyepiece optical module meets 1.650≦Wifx / Wip≦1.850, wherein Wip is the maximum width of the inner limit post in the first transverse width direction, and Wifx is the minimum width of the flexible printed circuit board in the first transverse width direction.

15. The eyepiece optical module according to claim 1 or 8, wherein the eyepiece optical module meets 1.100≦Wip / Lip≦1.450, wherein Lip is the maximum length of the inner limit post in the first longitudinal direction, and Wip is the maximum width of the inner limit post in the first transverse direction.

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