Eyepiece optical module

Abstract

The utility model provides a kind of eyepiece optical module, including a shell and a soft circuit board in strip shape. A plurality of light emitting units towards the eye side are provided on the soft circuit board, and the soft circuit board has a first horizontal width direction and a first longitudinal direction. The shell has an inner side wall towards the inside of the eyepiece optical module, a plurality of connecting units bonded with the soft circuit board are provided on the inner side wall, and the positions of these connecting units correspond to the positions of these light emitting units respectively. Each connecting unit has a glue storage groove for storing glue, a plurality of soft plate support portions provided around the glue storage groove, and an inner limiting column arranged along the first horizontal width direction. The soft circuit board is provided with an inner soft plate limiting portion corresponding to each inner limiting column, and the inner limiting column and the inner soft plate limiting portion cooperate to limit in the first longitudinal direction.

Description

Technical Field

[0001] This utility model relates to an optical module, and more particularly to an eyepiece optical module. Background Technology

[0002] Virtual reality (VR) uses computer technology to simulate a three-dimensional virtual world, providing users with sensory simulations such as sight and hearing. To make users feel truly immersed, it is usually combined with eye-tracking technology, which uses a light source inside the eyepiece's optical module to track and detect the observer's pupils to obtain the observer's current gaze direction.

[0003] This light source is typically mounted on a flexible printed circuit (FPC). Because it needs to connect to external components, the components often detach during assembly due to pulling. Furthermore, after high-temperature and high-humidity reliability testing, they are prone to detachment due to insufficient adhesion, thus reducing the reliability of the eyepiece optical module. Therefore, how to position a flexible printed circuit board with a light source onto an eyepiece optical module and increase the bonding strength between the two is a problem that needs improvement. Utility Model Content

[0004] This invention provides an eyepiece optical module whose structure 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 on it, thereby improving the assembly accuracy of the eyepiece optical module.

[0005] One embodiment of this utility model provides an eyepiece optical module, including a housing and a long, strip-shaped flexible circuit board. The flexible circuit board has multiple light-emitting units facing the eye, and 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 multiple connecting units bonded to the flexible circuit board are disposed on the inner sidewall, with the positions of these connecting units corresponding to the light-emitting units. Each connecting unit includes an adhesive reservoir, multiple flexible board support portions disposed around the adhesive reservoir, and an inner limiting post disposed along the first horizontal width direction. The adhesive reservoir includes a long adhesive storage section disposed along the first vertical length direction and a short adhesive storage section disposed along the first horizontal width direction. The flexible circuit board has an inner flexible board limiting portion corresponding to each inner limiting post; the inner limiting post and the inner flexible board limiting portion cooperate with each other to limit movement in the first vertical length direction.

[0006] One embodiment of this utility model provides an eyepiece optical module, including a housing and a long, strip-shaped flexible circuit board. The flexible circuit board has multiple light-emitting units facing the eye, and 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. Multiple connecting units bonded to the flexible circuit board are disposed on the inner sidewall, and these connecting units are positioned corresponding to the light-emitting units. Each connecting unit has an adhesive reservoir and an inner limiting post arranged along the first horizontal width direction. The flexible circuit board has an inner flexible plate limiting part corresponding to each inner limiting post, and the inner limiting post cooperates with the inner flexible plate limiting part to limit movement in the first vertical length direction. The peripheral portion has a flexible plate passing portion that allows the flexible circuit board to pass through the inner sidewall outwards. The flexible plate passing portion has an adhesive reservoir and multiple peripheral limiting posts arranged along a second horizontal width direction of the flexible circuit board. The flexible circuit board is provided with multiple peripheral flexible circuit board limiting parts corresponding to these peripheral limiting posts. By cooperating with these peripheral limiting posts and these peripheral flexible circuit board limiting parts, the flexible circuit board is limited in the second longitudinal direction.

[0007] In the eyepiece optical module of this embodiment, a flexible circuit board is provided with multiple light-emitting units facing the eye to provide a light source. Furthermore, the outer shell has an inner sidewall facing the interior of the eyepiece optical module, and multiple connecting units for bonding the flexible circuit board are disposed on the inner sidewall. These connecting units are positioned corresponding to the light-emitting units, facilitating positioning of each light-emitting unit. Moreover, each connecting unit has an adhesive reservoir and an inner limiting post. Adhesive can be stored in the reservoir, increasing 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 detaching. The inner limiting post is disposed along the first horizontal width direction, and the flexible circuit board has an inner flexible board limiting part corresponding to the inner limiting post. The inner limiting post and the inner flexible board limiting part cooperate to limit the flexible circuit board in the first longitudinal direction, preventing displacement of the flexible circuit board and the light-emitting units along the first longitudinal direction, thereby improving positioning accuracy and thus improving the assembly accuracy of the eyepiece optical module. Attached Figure Description

[0008] Figure 1 This is a three-dimensional schematic diagram of the eyepiece optical module of the first embodiment of the present invention.

[0009] Figure 2 for Figure 1 An exploded view of the eyepiece optical module.

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

[0011] Figure 4 for Figure 2A side view of the outer shell.

[0012] Figure 5 for Figure 2 A front view of the outer shell of the device.

[0013] Figure 6 for Figure 2 A front view diagram of the casing and flexible circuit board assembled together.

[0014] Figure 7 for Figure 2 A cross-sectional view of the casing and flexible circuit board.

[0015] Figure 8 This is a partially enlarged view of the connecting unit of the outer shell in the eyepiece optical module of the second embodiment of this utility model.

[0016] Figure 9 This is a partially enlarged view of the connecting unit of the outer shell in the eyepiece optical module of the third embodiment of this utility model.

[0017] Figure 10 This is a partial enlarged view of the flexible plate passage portion of the outer shell in the eyepiece optical module of the fourth embodiment of this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 100: Eyepiece optical module; 120: Lens;

[0020] 130, 150: Glue; 140: Lens mount; 160: Display unit;

[0021] 200: Outer shell; 210: Inner sidewall; 220: Connecting unit;

[0022] 221, 242: Glue storage tank; 222: Long glue storage section; 223, 246: Flexible board support section;

[0023] 224: Short rubber storage section; 225: Inner limiting post; 226: Long soft plate support section; 228, 228': Short soft plate support section;

[0024] 230: Peripheral section; 240: Flexible plate penetration section; 244: Peripheral limiting post;

[0025] 300: Flexible circuit board; 310: Light-emitting unit; 320: Inner flexible circuit board limiting part; 330: Peripheral flexible circuit board limiting part;

[0026] A1: Eye side; A2: Display side;

[0027] D1: First horizontal width direction; D2: First vertical length direction; D3: Second horizontal width direction; D4: Second vertical length 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 Implementation

[0030] Figure 1 This is a three-dimensional schematic diagram of the eyepiece optical module according to the first embodiment of this utility model. Figure 2 for Figure 1 An exploded view of the eyepiece optical module. Figure 3 for Figure 2 A three-dimensional schematic diagram of the outer shell. Figure 4 for Figure 2 A side view of the outer casing. Figure 5 for Figure 2 A front view of the outer shell. Figure 6 for Figure 2 A front view diagram showing the casing and flexible circuit board assembled together. Figure 7 for Figure 2 A cross-sectional view of the casing and flexible circuit board. Please refer to... Figures 1 to 7 The eyepiece optical module 100 of this embodiment includes a housing 200 and a long, strip-shaped flexible circuit board 300. In this embodiment, the flexible circuit board 300 is, for example, a flexible printed circuit (FPC). The flexible circuit board 300 is provided with a plurality of light-emitting units 310 facing the eye side A1 (e.g., ...). Figure 6 (As shown in the illustration), and the flexible circuit board 300 has a first horizontal width direction D1 and a first vertical length direction D2. The housing 200 has an inner sidewall 210 facing the interior of the eyepiece optical module 100, and a plurality of connection units 220 that are bonded to the flexible circuit board 300 are disposed on the inner sidewall 210, and the positions of these connection units 220 respectively correspond to the positions of these light-emitting units 310.

[0031] Each connecting unit 220 includes an adhesive reservoir 221 for storing adhesive, multiple flexible board support portions 223 disposed around the adhesive reservoir 221, and an inner limiting post 225 disposed along the first horizontal width direction D1. The adhesive reservoir 221 includes a long adhesive storage section 222 disposed along the first longitudinal direction D2 and a short adhesive storage section 224 disposed along the first horizontal width direction D1. The flexible circuit board 300 is provided with an inner flexible board limiting portion 320 corresponding to each inner limiting post 225. The inner limiting post 225 and the inner flexible board limiting portion 320 cooperate with each other to limit the position in the first longitudinal direction D2. In this embodiment, the inner flexible 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 circuit board 300, and a housing 200, arranged sequentially 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 by the adhesive 130, and the lens holder 140 is fixed to the housing 200 by the adhesive 150. In this embodiment, the light-emitting unit 310 is a light-emitting diode, such as an infrared light-emitting diode, and 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 micromirror device (DMD), a micro-LED display, or other suitable display. In this embodiment, the eyepiece optical module 100 is used to image a light beam that enters the observer's eye from the display unit 160 via the eyepiece optical module 100. In this embodiment, the light-emitting unit 310 can emit infrared light, which is then irradiated by the lens 120 onto the user's eye located at the eye side A1 to provide sufficient light source for the infrared camera used to track the pupil of the user's eye.

[0033] In this embodiment, the outer casing 200 further includes a peripheral portion 230 connected to the inner sidewall 210. The peripheral portion 230 has a flexible circuit board (PCB) passage portion 240 through which the flexible circuit board 300 passes outward from the inner sidewall 210. The PCB passage portion 240 has a glue reservoir 242 and a plurality of peripheral limiting posts 244 disposed 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 PCB limiting portions 330 (e.g., ...) corresponding to these peripheral limiting posts 244. Figure 6 (As illustrated), the flexible circuit board 300 is positioned along a second longitudinal direction D4 by means of the peripheral limiting posts 244 cooperating with the peripheral flexible circuit board limiting portions 330. 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 horizontal width direction D1 and the first vertical length direction D2 refer to the horizontal width direction and the vertical length direction of the portion of the flexible circuit board on the inner sidewall 210, respectively, while the second horizontal width direction D3 and the second vertical length direction D4 refer to the horizontal width direction and the vertical length direction of the portion of the flexible circuit board on the flexible board through portion 240, respectively.

[0035] In the eyepiece optical module 100 of this embodiment, a plurality of light-emitting units 310 facing the eye side A1 are provided on the flexible circuit board 300 to provide a light source. Furthermore, the housing 200 has an inner sidewall 210 facing the interior of the eyepiece optical module 100, and a plurality of connecting units 220 for bonding the flexible circuit board 300 are provided on the inner sidewall 210. The positions of these connecting units 220 correspond to the positions of the light-emitting units 310, which facilitates positioning of each light-emitting unit 310. Moreover, each connecting unit 220 includes an adhesive reservoir 221, a plurality of flexible circuit board support portions 223, and an inner limiting post 225. The adhesive can be stored in an adhesive reservoir 221. The reservoir 221 has a long adhesive storage section 222 along the first longitudinal direction D2 of the flexible circuit board 300, which bonds most of the flexible circuit board 300. A short adhesive storage section 224 is provided along the first transverse direction D1 of the flexible circuit board 300, which increases the bonding force when the flexible circuit board 300 is bent. By optimizing the bonding area, the adhesion between the housing 200 and the flexible circuit board 300 is improved, preventing the flexible circuit board 300 from detaching. In addition, these flexible circuit board support portions 223 provide support for the flexible circuit board 300 and help maintain a uniform adhesive thickness. These flexible circuit board support portions 223 are located around the adhesive reservoir 221 to retain sufficient adhesive storage area. The inner limiting post 225 is disposed along the first horizontal width direction D1, and the flexible circuit board 300 is provided with an inner flexible board limiting part 320 corresponding to the inner limiting post 225. By cooperating with the inner limiting post 225 and the inner flexible board limiting part 320, the flexible circuit board 300 is limited in the first longitudinal direction D2, preventing the flexible circuit board 300 and the light-emitting unit 310 from displacing along the first longitudinal direction D2, thereby improving the positioning accuracy and thus improving the assembly accuracy of the eyepiece optical module 100. Compared with conventional eyepiece optical modules, where the flexible circuit board is prone to detachment due to insufficient adhesion after high temperature and high humidity test (ORT test), resulting in a decrease in the reliability of the eyepiece optical module, the eyepiece optical module 100 of this embodiment can improve this problem by means of the above structure, making the flexible circuit board less prone to detachment, thereby effectively improving the reliability of the eyepiece optical module 100.

[0036] Furthermore, in conventional eyepiece optical modules, flexible circuit boards typically need to pass through the outer shell from the inside to connect to other components. When the through-hole on the outer shell for the flexible circuit board to pass through is a plane, the flexible circuit board will shift due to the pulling during assembly, causing other components to fall off. Therefore, this embodiment designs an eyepiece optical module 100 to overcome this problem. In the eyepiece optical module 100 of this embodiment, the outer shell 200 also has a peripheral portion 230 connected to the inner sidewall 210. The flexible circuit board 300 is fixed to the inner sidewall 210 by the glue storage grooves 221 on the aforementioned connecting units 220, and an inner flexible board limiting portion 320 is provided corresponding to these inner limiting posts 225. Through the cooperation of the two, displacement of the flexible circuit board 300 and the light-emitting unit 310 along the first longitudinal direction D2 is prevented, achieving the limiting function. Furthermore, the flexible circuit board 300 passes through the outer shell through the flexible board through-hole 240 to connect with external components. The flexible circuit board (PCB) through-hole 240 has an adhesive reservoir 242 for fixing the PCB 300, and also has a plurality of peripheral limiting posts 244 arranged along the second horizontal width direction D3. The PCB 300 has a plurality of peripheral PCB limiting parts 330 corresponding to these peripheral limiting posts 244. Through the cooperation of both, the PCB 300 is limited in the second longitudinal direction D4. In this embodiment, the combination of the inner limiting post 225 and the peripheral limiting post 244 further prevents the PCB 300 from shifting due to pulling during assembly, thus avoiding the detachment of other components connected to the PCB 300.

[0037] In this embodiment, each connection unit 220 conforms to:

[0038] 60% ≤ Total area of ​​these flexible board support sections / Total area of ​​glue storage tank ≤ 70% Equation (1)

[0039] In this embodiment, the total area of ​​these flexible board support portions in formula (1) refers to the total area of ​​these flexible board support portions 223, while the total area of ​​the glue storage tank refers to the total area of ​​the glue storage tank 221. When the total area of ​​these flexible 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 tank 221 will be insufficient, thus reducing the adhesive force; when the total area of ​​these flexible board support portions 223 is too small (for example, the ratio in formula (1) is lower than the lower limit of 60%), the connecting unit 220 is easily damaged during assembly and pressing.

[0040] In this embodiment, the eyepiece optical module 100 conforms to:

[0041] 6.000≦Th / Dg≦7.000 (2)

[0042] Where Th is the minimum thickness of the outer shell 200 corresponding to the glue reservoir 221, and Dg is the maximum depth of the glue reservoir 221. If the ratio of Th / Dg is too large, the glue reservoir 221 is too shallow, and there is too little space to hold the glue, which may cause the glue to be squeezed out when assembling the flexible circuit board 300; if this ratio is too small, the glue reservoir 221 is too deep, resulting in a thinner outer shell 200 and insufficient strength.

[0043] In this embodiment, these flexible circuit board support portions 223 have at least one long flexible circuit board support portion 226 disposed along the first longitudinal direction D2 and one short flexible circuit board support portion 228 disposed along the first transverse direction D1. The long flexible circuit board support portion 226 is disposed corresponding to the long adhesive storage section 222, so that the flexible circuit board 300 is supported in the first longitudinal direction D2 and makes it conform to the housing 200; the short flexible circuit board support portion 228 is disposed corresponding to the short adhesive storage section 224, so as to provide support in the first transverse direction D1 and prevent the flexible circuit board 300 from deforming when bent.

[0044] In this embodiment, the eyepiece optical module 100 conforms to:

[0045] 1.500≦Wlg / Wls≦2.000 (3)

[0046] Where Wlg is the maximum width of the long adhesive storage section 222 in the first horizontal direction D1, and Wls is the maximum width of the long flexible board support 226 in the first horizontal direction D1. When the ratio of Wlg / Wls is too large, the width of the long flexible board support 226 is too small, resulting in insufficient strength and easy damage. Furthermore, there is not enough area for the flexible circuit board 300 to support it, making it difficult to adhere during dispensing and reducing assembly accuracy. When this ratio is too small, the width of the long adhesive storage section 222 is too small, resulting in insufficient area of ​​the adhesive storage tank 221 and reduced adhesion.

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

[0048] In this embodiment, the eyepiece optical module 100 conforms to:

[0049] 2.650≦Ls s / Lip≦5.800 (4)

[0050] Where Lss is the maximum length of the short flexible board support 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. When the ratio of Lss / Lip is too large, the length of the inner limiting post 225 is too small, resulting in insufficient strength and easy damage, thus losing its limiting function; when this ratio is too small, the length of the short flexible board support 228 is too short, resulting in insufficient strength and easy damage, and there is not enough area for the flexible circuit board 300 to support it, making it difficult to adhere during dispensing and reducing assembly accuracy.

[0051] In this embodiment, these peripheral limiting posts 244 are symmetrically arranged in the second lateral width direction D3. With this design, when the flexible circuit board 300 passes over the housing 200 to connect with other parts, the tensile force generated during assembly can be evenly distributed, resulting in a better limiting effect.

[0052] In this embodiment, the eyepiece optical module 100 conforms to:

[0053] 3.350≦Wsfx / Wpp≦5.650 (5)

[0054] Where Wpp is the maximum width of any circumferential limiting post 244 in the second transverse width direction D3 (e.g., ...). Figure 5 As shown in the diagram), and Ws fx is the minimum width of the flexible circuit board 300 in the second horizontal direction D3 (e.g. Figure 6 (As illustrated). When the width of the peripheral limiting post 244 in the second horizontal direction D3 is too large, the size of the mating peripheral flexible circuit board limiting part 330 will be too large, resulting in the width of the flexible circuit board 300 in the second horizontal direction D3 being too small and difficult to manufacture; when the width of the peripheral limiting post 244 in the second horizontal direction D3 is too small, it is impossible to limit the flexible circuit board 300, and the effect of the embodiment of this utility model cannot be achieved.

[0055] In this embodiment, the eyepiece optical module 100 conforms to:

[0056] 1.350≦Wpp / Lpp≦1.600 (6)

[0057] Where Wpp is the maximum width of any circumferential limiting post 244 in the second transverse direction D3, and Lpp is the maximum length of any circumferential limiting post 244 in the second longitudinal direction D4 (e.g., Figure 5 (As illustrated). When the ratio of Wpp / Lpp is too large, the length of its peripheral limiting post 244 in the second longitudinal direction D4 is too small, and the strength of this peripheral limiting post 244 is insufficient, making it easy to be damaged during assembly and losing its limiting function; when this ratio is too small, the width of its peripheral limiting post 244 in the second transverse direction D3 is too small, and it cannot limit the flexible circuit board 300, thus failing to achieve the effect of the embodiment of this utility model.

[0058] In this embodiment, the flexible circuit board through-hole 240 has a plurality of flexible circuit board support portions 246 disposed around the adhesive storage tank 242. These flexible circuit board support portions 223, 246 are disposed around the adhesive storage tanks 221, 242, providing support for the flexible circuit board 300 and facilitating the positioning of the light-emitting unit 310.

[0059] In this embodiment, these peripheral limiting posts 244 are disposed on these flexible circuit board support portions 246. This design helps to optimize the area of ​​the glue reservoir 242 and increase the adhesion. By fixing the glue height and providing support for the flexible circuit board 300 by the flexible circuit board support portion 246, the flexible circuit board 300 can be better fixed on the flexible circuit board through portion 240 when connected to external components, and is less prone to deformation.

[0060] In this embodiment, the eyepiece optical module conforms to:

[0061] 1.650≦Wifx / Wip≦1.850 (7)

[0062] Where Wip is the maximum width of the inner limiting post 225 in the first transverse width direction D1 (e.g., ... Figure 5 As shown in the drawing), and the minimum width of the Wifx flexible circuit board 300 in the first horizontal direction D1 (e.g. Figure 6 (As illustrated). If the width of the inner limiting post 225 in the first horizontal direction D1 is too wide, the size of the mating inner flexible board limiting part 320 will be too large, resulting in the width of the flexible circuit board 300 in the first horizontal direction D1 being too narrow and difficult to manufacture; if the width of the inner limiting post 225 in the first horizontal direction D1 is too small, it will be unable to limit the flexible circuit board 300, and the effect of the embodiment of this utility model cannot be achieved.

[0063] In this embodiment, the eyepiece optical module conforms to:

[0064] 1.100≦Wip / Lip≦1.450 (8)

[0065] Wherein 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 of 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 will 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, which will prevent it from limiting the flexible circuit board 300 and will not achieve the effect of the embodiment of this utility model.

[0066] Figure 8 This is a partially enlarged view of the connection unit of the outer shell in the eyepiece optical module of the second embodiment of this utility model. Please refer to... Figure 8The eyepiece optical module of this embodiment is similar to the eyepiece optical module 100 of the first embodiment. The difference is that in the connection unit 220 of this embodiment, the inner limit position 225 is disposed on one side of the short flexible plate support portion 228, and is not disposed on the short flexible plate support portion 228.

[0067] Figure 9 This is a partially enlarged view of the connecting unit of the outer shell in the eyepiece optical module of the third embodiment of this utility model. Please refer to... 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. In the eyepiece optical module 100 of the first embodiment, please refer to... Figure 3 In addition to the long flexible board support portion 226 and the short flexible board support portion 228, the flexible board support portion 223 also includes another short flexible board support portion 228', which is arranged along the first longitudinal direction D2 with the short flexible board support portion 228 and along the first transverse direction D1 with the long flexible board support portion 226. However, in Figure 9 In this embodiment, the flexible board support portion 223 includes a long flexible board support portion 226 and a short flexible board support portion 228, but does not include, for example, the long flexible board support portion 226 and the short flexible board support portion 228. Figure 3 Another short flexible board support section 228'.

[0068] Figure 10 This is a partially enlarged view of the flexible plate penetration portion of the outer shell in the eyepiece optical module of the fourth embodiment of this utility model. Please refer to... Figure 10 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. In the flexible plate passing part 240 of this embodiment, the peripheral limiting post 244 is not symmetrically arranged in the second horizontal width direction D3. In addition, the flexible plate support part 246 is not symmetrically arranged in the second horizontal width direction D3.

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

[0070] Table 1

[0071] 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, this invention is not limited to the values ​​of the parameters in Table 1. In other embodiments, these parameters may be other values.

[0073] In summary, in the eyepiece optical module of this embodiment, a flexible circuit board is provided with multiple light-emitting units facing the eye to provide a light source. Furthermore, the housing has an inner sidewall facing the interior of the eyepiece optical module, and multiple connecting units for bonding the flexible circuit board are disposed on the inner sidewall. These connecting units are positioned corresponding to the light-emitting units, facilitating positioning of each light-emitting unit. Moreover, each connecting unit has an adhesive reservoir and an inner limiting post. Adhesive can be stored in the 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 detaching. The inner limiting post is disposed along the first horizontal width direction, and the flexible circuit board has an inner flexible board limiting part corresponding to the inner limiting post. The inner limiting post and the inner flexible board limiting part cooperate to limit the flexible circuit board in the first longitudinal direction, preventing displacement of the flexible circuit board and the light-emitting units along the first longitudinal direction, thereby improving positioning accuracy and thus improving 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 has multiple light-emitting units facing the eye. The flexible circuit board has a first horizontal width direction and a first vertical length direction. The housing has an inner sidewall facing the inside of the eyepiece optical module, and multiple connection units that are bonded to the flexible circuit board are disposed on the inner sidewall, with the positions of these connection units corresponding to the positions of the light-emitting units. Each connecting unit has a glue storage tank for storing glue, multiple flexible board support parts arranged around the glue storage tank, and an inner limiting post arranged along the first horizontal width direction. The glue storage tank includes 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 part for each inner limiting post. The inner limiting post and the inner flexible board limiting part cooperate with each other to limit the movement in the first longitudinal direction.

2. The eyepiece optical module as claimed in claim 1, wherein each connecting unit conforms to the following: 60% ≤ total area of ​​the flexible plate supports / total area of ​​the glue reservoir ≤ 70%.

3. The eyepiece optical module as claimed in claim 1, wherein the eyepiece optical module conforms to 6.000≦Th / Dg≦7.000, where Th is the minimum thickness of the outer shell corresponding to the glue reservoir, and Dg is the maximum depth of the glue reservoir.

4. The eyepiece optical module as claimed in claim 1, wherein the flexible plate support portions have at least a long flexible plate support portion disposed along the first longitudinal direction and a short flexible plate support portion disposed along the first transverse direction.

5. The eyepiece optical module as claimed in claim 4, wherein the eyepiece optical module conforms to 1.500≦Wlg / Wls≦2.000, where Wlg is the maximum width of the long glue storage section in the first horizontal direction, and Wls is the maximum width of the long flexible plate support in the first horizontal direction.

6. The eyepiece optical module as claimed in claim 4, wherein the inner limiting post is disposed near the short flexible plate support portion.

7. The eyepiece optical module as claimed in claim 4, wherein the eyepiece optical module conforms to 2.650≦Ls s / Lip≦5.800, where Lss is the maximum length of the short flexible plate support in the first longitudinal direction, and Lip is the maximum length of the inner limiting 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 has multiple light-emitting units facing the eye. The flexible circuit board has a first horizontal width direction and a first vertical length direction. The housing has an inner sidewall facing the inside of the eyepiece optical module and a peripheral portion connected to the inner sidewall. Multiple connection units that are bonded to the flexible circuit board are disposed on the inner sidewall, and the positions of these connection units correspond to the light-emitting units respectively. Each connecting unit has an adhesive reservoir and an inner limiting post arranged along the first horizontal width direction. The flexible circuit board is provided with an inner flexible board limiting part corresponding to each inner limiting post. The inner limiting post and the inner flexible board limiting part cooperate to limit the position in the first longitudinal direction. The peripheral portion has a flexible circuit board passage portion that allows the flexible circuit board to pass through the inner sidewall outward. The flexible circuit board passage portion has a glue reservoir and a plurality of peripheral limiting posts arranged along a second transverse width direction of the flexible circuit board. The flexible circuit board has a plurality of peripheral flexible circuit board limiting parts corresponding to these peripheral limiting posts. By the cooperation of these peripheral limiting posts and peripheral flexible circuit board limiting parts, the flexible circuit board is limited in a second longitudinal direction.

9. The eyepiece optical module of 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 conforms to 3.350≦Wsfx / Wpp≦5.650, where 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 circuit board in the second transverse direction.

11. The eyepiece optical module of claim 8, wherein the eyepiece optical module conforms to 1.350≦Wpp / Lpp≦1.600, where 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 plate through portion and each connecting unit have a plurality of flexible plate support portions disposed around the glue storage tank.

13. The eyepiece optical module of claim 12, wherein the peripheral limiting posts are disposed on the flexible plate support portions.

14. The eyepiece optical module as claimed in claim 1 or 8, wherein the eyepiece optical module conforms to 1.650≦Wifx / Wip≦1.850, where Wip is the maximum width of the inner limiting post in the first horizontal direction, and Wifx is the minimum width of the flexible circuit board in the first horizontal direction.

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

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