Eyepiece optical module

Abstract

An eyepiece optical module comprises a first housing, a second housing and a lens arranged between the first housing and the second housing. One of the first housing and the second housing comprises at least three supporting cylinders, the other comprises at least three guide grooves, and only the supporting cylinder is in direct contact between the first housing and the second housing. Any of the three supporting cylinders satisfies the following conditional formula: 0.20≦r1 / H1≦4.40 and 0.34 mm≦r1≦1.35 mm, wherein r1 is the radius of one end of the supporting cylinder, and H1 is the height of the supporting cylinder.

Description

Technical Field

[0001] The invention relates to an optical module, and in particular to an eyepiece optical module. Background Art

[0002] The weight and volume of near-eye displays are closely related to the wearing comfort of users. With the vigorous development of virtual reality (VR) and augmented reality (AR) technologies, the increasing number of optical components has also made it challenging to reduce the weight of near-eye displays and improve the assembly yield.

[0003] Figure 1 : is a cross-sectional schematic diagram of an eyepiece optical module of the related art. For example, the eyepiece optical module 1 includes a display element 400, a display element adhesive layer 2, a display element housing 3, a lens housing 4, a first lens 300A, a second lens 300B and a screw 5. The display element 400 is connected to the display element housing 3 using the display element adhesive layer 2, and the display element housing 3 and the lens housing 4 are connected to each other using screws 5. Since the display element housing 3 and the lens housing 4 are large in volume, the first lens 300A and the second lens 300B are heavy, and screws 5 are usually used as a combining element. However, the locking structure of screws 5 and screws 5 has a minimum area and volume limit, making it difficult to manufacture. Screws 5 also have a certain weight, and their material and assembly costs are also high. On the other hand, when the display element housing 3 and the lens housing 4 are combined by a dispensing method in the hope of reducing the volume, weight and cost, it often occurs that the dispensing colloid overflows between the housing joints or on the first lens 300A and the second lens 300B, resulting in a low assembly yield. Therefore, how to manufacture lightweight, low-cost and high-yield eyepiece optical modules is a problem that the industry currently needs to solve. Summary of the invention

[0004] The invention provides an eyepiece optical module, which is easy to assemble, light in device and has good production yield.

[0005] In one embodiment of the present invention, the eyepiece optical module of the present invention includes a first housing, a second housing, and a lens disposed between the first housing and the second housing. One of the first housing and the second housing includes at least three supporting cylinders, and the other includes at least three guide grooves, and only the supporting cylinder and the guide groove are in direct contact between the first housing and the second housing. Any of the three supporting cylinders satisfies the following conditional formula: 0.20≦r 1 / H 1≦4.40 and 0.34 mm≦r 1≦1.35 mm, where r 1 is the radius of one end of the supporting cylinder, and H 1 is the height of the supporting cylinder.

[0006] In another embodiment of the present invention, the eyepiece optical module of the present invention includes a first housing, a second housing, and a lens disposed between the first housing and the second housing. One of the first housing and the second housing includes three supporting cylinders, and the other includes three guide grooves, and only three supporting cylinders between the first housing and the second housing are in direct contact with the guide grooves. Any of the three supporting cylinders satisfies the following conditional formula: 0.20≦r 1 / H 1≦4.40 and 45.00≦ODh / r 1≦190.00, wherein r 1 is the radius of the bottom surface of one end of the supporting cylinder, H 1 is the maximum height of the supporting cylinder, and ODh is the maximum outer diameter of the first housing.

[0007] Based on the above, the eyepiece optical module of the embodiment of the present invention is assembled with a supporting cylinder. Since the supporting surface is circular, it is convenient for mold processing, and at the same time reduces the risk of excessive local stress, and increases the supporting area when the assembly is misaligned under the same assembly accuracy, which is conducive to lightweight and reducing material costs. In addition, the first shell and the second shell are in direct contact with each other by means of three supporting cylinders, so that the adhesive layer between the two shells is less likely to overflow during assembly, avoiding the risk of offset and yield reduction when the first shell and the second shell are assembled. On the other hand, it also avoids the problem that when the number of supporting cylinders is less than 3, the first shell and the second shell cannot effectively support each other during assembly, which easily causes tilting.

[0008] Moreover, when the above two conditions are met, even under certain precision, material yield strength and assembly force (e.g. 0.05 mm, 6 MPa and 6 kgw), it is also beneficial for the eyepiece optical module to assemble the first shell and the second shell by using the dispensing method. This can avoid the risk of misalignment and damage during assembly due to the small radius of the supporting cylinder, or the risk of glue overflow due to the large radius. Furthermore, by designing the supporting cylinder and the guide groove to engage with each other, the probability of misalignment during assembly of the first shell and the second shell can be greatly reduced, which facilitates assembly and improves the assembly yield.

[0009] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a cross-sectional schematic diagram of an eyepiece optical module of the related art.

[0011] Figure 2 FIG. 4 is a side view schematic diagram of an eyepiece optical module according to an embodiment of the present invention.

[0012] Figure 3 yes Figure 2 Exploded view of the eyepiece optical module.

[0013] Figure 4A is a schematic top view of a first housing according to an embodiment of the present invention.

[0014] Figure 4 B is a schematic top view of the first housing and the first lens after being assembled according to an embodiment of the present invention.

[0015] Figure 4 C is Figure 4 A partial enlarged schematic diagram of B.

[0016] Figure 5 A to Figure 5 C is an eyepiece optical module according to an embodiment of the present invention, Figure 4 An enlarged schematic diagram of section line AA' of B is drawn.

[0017] Figure 6 A to Figure 6 C is an eyepiece optical module according to an embodiment of the present invention, Figure 4 An enlarged schematic diagram of section line BB' of B.

[0018] Figure 7 A to Figure 7 C is an eyepiece optical module according to an embodiment of the present invention, Figure 4 An enlarged schematic diagram of section line C-C' of B.

[0019] Figure 8 1 is a schematic top view of a first housing according to an embodiment of the present invention.

[0020] 9A to 9C They are respectively a side view schematic diagram, a top view schematic diagram and a cross-sectional view schematic diagram of a supporting cylinder and a guide groove according to an embodiment of the present invention.

[0021] Fig. 10A and Fig. 10B The eyepiece optical module of one embodiment of the present invention is an assembly diagram of the second lens and the first housing thereof.

[0022] Fig.11A and Fig. 11B 1 is a schematic diagram of assembling a first lens and a first housing of an eyepiece optical module according to another embodiment of the present invention. DETAILED DESCRIPTION

[0023] Before the present invention is described in detail, the symbols in the accompanying drawings are first clearly indicated: 1, 10: eyepiece optical module; 2: display element adhesive layer; 3: display element housing; 4: lens housing; 5: screw; 100: first housing; 110A, 110B, 110C: supporting cylinder; 120, 220: platform; 130A: first adhesive layer; 130B: first lens adhesive layer; 130C: second lens adhesive layer; 131A, 131B: first part; 132A, 132B: second part 133A, 133B: third part; 140X: first direction limiting column; 140Y: second direction limiting column; 140Z: third direction limiting column; 150A, 150B, 150C: pre-cured glue groove; 160A, 160B: lens glue groove; 200: second shell; 210A, 210B, 210C: guide groove; 300A: first lens; 300B: second lens; 400: display element; A-A', B-B', C-C': section line; CL: circumference; D: spacing; H1, H2: height; H3: depth; Lla: major axis; Lsa: minor axis; O: center; ODh: maximum outer diameter; r1, r2: radius; r3, r4: radius of curvature; α, β, γ: angle.

[0024] As used herein, "about", "approximately", "essentially", or "substantially" include the stated value and the average value within an acceptable deviation range of the particular value determined by one of ordinary skill in the art, taking into account the measurement in question and the particular amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within, for example, ±30%, ±20%, ±15%, ±10%, ±5%. Furthermore, as used herein, "about", "approximately", "essentially", or "substantially" can select a more acceptable deviation range or standard deviation depending on the measured property, cutting property or other property, and can apply to all properties without one standard deviation.

[0025] In the accompanying drawings, the thickness of layers, films, panels, regions, etc., is exaggerated for clarity. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to another element, or intermediate elements may also exist. Conversely, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intermediate elements. As used herein, "connected" may refer to physical and / or electrical connections.

[0026] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and description to refer to the same or like parts.

[0027] Figure 2 is a side view schematic diagram of an eyepiece optical module according to an embodiment of the present invention, Figure 3 yes Figure 2 Exploded view of the eyepiece optical module. Please also refer to Figure 2 and Figure 3 The eyepiece optical module 10 includes a first housing 100, a second housing 200, a first lens 300A, a second lens 300B, and a display (not shown). The display and the first lens 300A are respectively located on opposite sides of the second housing 200 in the direction Z. The display is used to provide a display beam, and the display beam is sequentially passed through the second housing 200, the first lens 300A, the first housing 100, and the second lens 300B via the direction Z, and then transmitted to the eyes of the user (not shown) to generate a display image. The material of the first housing 100 and the second housing 200 can be, for example, plastic, and the material of the first lens 300A and the second lens 300B can be, for example, a plastic optical molding material, such as polymethyl methacrylate (PMMA), polycarbonate (PC), etc., but the present invention is not limited thereto. Here, the direction Z can represent the extension direction of the optical axis of the eyepiece optical module 10.

[0028] The eyepiece optical module 10 further includes a multi-layer adhesive to firmly connect the first lens 300A, the second lens 300B, the first housing 100, and the second housing 200. For example, the first lens adhesive layer 130B can be disposed around the first lens 300A so that the first lens 300A can be connected to one side of the first housing 100 (e.g., the side of the first housing 100 facing away from the direction Z). Similarly, the second lens adhesive layer 130C can be disposed around the second lens 300B so that the second lens 300B can be connected to the other side of the first housing 100 (e.g., the side of the first housing 100 facing the direction Z). The first adhesive layer 130A can be used to connect the first housing 100 and the second housing 200 to each other, so that the first lens 300A can be disposed between the first housing 100 and the second housing 200. The first adhesive layer 130A, the first lens adhesive layer 130B and the second lens adhesive layer 130C may be made of epoxy resin or UV glue, but the present invention is not limited thereto. It is worth mentioning that the eyepiece optical module 10 of the present invention can effectively avoid the problem of glue overflow when the above-mentioned glue layers are coated (please allow for the following description).

[0029] Figure 4 A is a schematic top view of a first housing according to an embodiment of the present invention. Figure 4 B is a schematic top view of the first housing and the first lens after being assembled according to an embodiment of the present invention. Figure 4 C is Figure 4 A partial enlarged schematic diagram of B. Please also refer to Figure 3 to Figure 4 C, one of the first shell 100 and the second shell 200 includes at least three supporting cylinders 110A~110C, and the other includes at least three guide grooves 210A~210C. The first shell 100 and the second shell 200 can be connected to each other only by at least three supporting cylinders 110A~110C and at least three guide grooves 210A~210C. That is, other parts of the first shell 100 and other parts of the second shell 200 may not contact each other, but only by at least three supporting cylinders 110A~110C and at least three guide grooves 210A~210C. In other embodiments, the number of guide grooves and the number of supporting cylinders may be only three or more than three. The present invention is not limited to this. If the first shell 100 and the second shell 200 only have three supporting cylinders 110A to 110C in direct contact with the three guide grooves 210A to 210C, it is helpful to reduce the probability and risk of glue overflowing between the supporting cylinders 110A to 110C in direct contact with the first shell 100 and the second shell 200 during assembly, causing the eyepiece optical system to be eccentric and resulting in a decrease in yield.

[0030] Fig.11A and Fig. 11B FIG. 1 is an assembly diagram of an eyepiece optical module according to another embodiment of the present invention, and a first lens and a first housing thereof. Figure 4 A to Figure 4 C and Fig.11A and Fig. 11B For the convenience of explanation, Figure 4 A to Figure 4 In the embodiment C, the first housing 100 includes three guide grooves 210A-210C, and the second housing 200 includes three supporting cylinders ( Figure 4 A to Figure 4 The implementation method of C (not shown) is used as an exemplary description. However, the present invention is not limited to this. Fig.11A and Fig. 11B In the embodiment, the first housing 100 may include three supporting cylinders 110A-110C, and the second housing 200 may include three guide grooves 210A-210C (in FIG. 11A to FIG. 11BIt is worth mentioning that any of the three supporting cylinders 110A-110C satisfies the following conditional expressions: 0.20≦r 1 / H 1≦4.40 and 0.34 mm≦r 1≦1.35 mm, wherein r 1 is the radius of a bottom surface of one end of the supporting cylinder 110A-110C, and H 1 is the height of the supporting cylinder 110A-110C on the first housing 100. In the embodiment where the supporting cylinder 110A-110C is disposed on the second housing 200, H 1 may also be the height of the supporting cylinder 110A-110C on the second housing 200. In some embodiments, the following conditional expressions may also be further satisfied: 0.80≦r 1 / H 1≦2.80 and 0.40 mm≦r 1≦0.82 mm.

[0031] The supporting surface of the supporting cylinders 110A-110C is circular, and the ratio of the radius r1 and the height H1 in the above conditional expression is not only conducive to mold processing, but also can reduce the risk of excessive local stress between the first shell 100 and the second shell 200. And under the condition of unchanged assembly accuracy, the supporting area when the first shell 100 and the second shell 200 are assembled and misaligned is increased, which is conducive to the lightweight of the eyepiece optical module 10 and the reduction of material costs. In addition, the first shell 100 and the second shell 200 are directly in contact with solid components such as three supporting cylinders 110A-110C and guide grooves 210A-210C, so that the first adhesive layer 130A between the two shells is less likely to overflow due to extrusion during assembly. Avoid the risk of deflection and yield reduction during assembly of the first shell 100 and the second shell 200. On the other hand, it also avoids the inability of the first shell 100 and the second shell 200 to effectively support each other during assembly, causing tilting. In addition, the textures and patterns of the three supporting columns 110A-110C and the three guide grooves 210A-210C are also conducive to visual identification, reducing the difficulty of assembling the eyepiece optical module 10, and thus improving the yield rate of the product.

[0032] Please continue to refer to Figure 4 A and Figure 4 In order to further reduce the risk of glue overflow of the first adhesive layer 130A and stabilize the assembly between the first housing 100 and the second housing 200, the relative positions of the three supporting cylinders 110A-110C and the three guide grooves 210A-210C can be optimized. Figure 4Any two of the corresponding positions of the three guide grooves 210A~210C in A) can form two connecting lines relative to the center O of the first shell 100, and the angle α formed by the two connecting lines can have the following range: 90 degrees ≦ α ≦ 135 degrees. The three guide grooves 210A~210C of the first shell 100 and the three supporting cylinders 110A~110C of the second shell 200 can be connected to each other. In some embodiments, the angle α can be 120 degrees, for example. That is to say, if the periphery of the first shell 100 is approximated as a circle, the center O of the first shell 100 can be approximated as the center of the circle, and the center angle formed by any two of the three supporting cylinders 110A~110C or any two of the three guide grooves 210A~210C relative to the center O can be substantially 120 degrees.

[0033] Under the configuration of the above-mentioned angle α, the three supporting cylinders 110A~110C are evenly distributed relative to the center O, so that the first shell 100 and the second shell 200 can remain stable during assembly, and the stresses on each part of the first adhesive layer 130A can be roughly the same, reducing the risk of glue overflowing to other parts or even overflowing onto the first lens 300A to block the display light beam.

[0034] Please continue to refer to Figure 4 A and Figure 4 B. It is worth mentioning that, in order to facilitate the assembly of the first lens 300A and the first housing 100, the first housing 100 may further include a first direction limiting column 140X, two second direction limiting columns 140Y and three third direction limiting columns 140Z. The first direction limiting column 140X, the second direction limiting column 140Y and the third direction limiting column 140Z are, for example, integrally formed with the first housing 100 and are convex blocks facing the first lens 300A, for contacting and fixing the first lens 300A.

[0035] Specifically, the first direction limiting column 140X is, for example, Figure 4 The two second direction limiting posts 140Y are arranged in the negative direction X and contact the first lens 300A to limit the translation of the first lens 300A in the direction X. Figure 4 A is disposed in the direction Y of the first lens 300A and contacts the two ends of the first lens 300A extending in the direction X, so as to limit the translation of the first lens 300A in the direction Y. Similarly, the three third direction limiting pillars 140Z are, for example, respectively disposed at positions adjacent to the three guide grooves 210A-210C, so as to respectively abut against the first lens 300A to prevent it from translating in the direction Z. Similarly, as Figure 3As shown in the exploded view, the other side of the first housing 100 may also have a first direction limiting column 140X, two second direction limiting columns 140Y and three third direction limiting columns 140Z for fixing the second lens 300B. The relationship between the relevant components can be referred to the above paragraphs and will not be repeated here.

[0036] On the other hand, before packaging the components, the first lens 300A and the second lens 300B may be pre-fixed to avoid the first lens 300A and the second lens 300B from being offset or even separated during assembly. For example, the first housing 100 may further include a pre-curing glue groove 150A, a pre-curing glue groove 150B, and a pre-curing glue groove 150C, and a dispensing material (not shown) disposed in the pre-curing glue grooves 150A to 150C. The three pre-curing glue grooves 150A to 150C may be further alternately disposed with the three third direction limiting pillars 140Z. For example, the line formed by any one of the three pre-curing glue grooves 150A~150C and the center O, and the line formed by any one of the three third-direction limiting pillars 140Z and the center O have an angle γ, and the angle γ can be greater than or equal to 45 degrees (that is, the angle γ formed by any one of the pre-curing glue grooves 150A~150C and the adjacent third-direction limiting pillars 140Z and the center O, respectively, can be 45 degrees at the minimum). In some embodiments, the angle γ can be substantially 60 degrees. To put it another way, if the periphery of the first shell 100 is approximated as a circle, the center O of the first shell 100 can be approximated as the center of the circle. The three third-direction limiting pillars 140Z and the three pre-curing glue grooves 150A~150C can be alternately distributed on the circumference, and the central angle formed by the third-direction limiting pillar 140Z and any one of the adjacent pre-curing glue grooves 150A~150C is the angle γ, and the angle γ can be substantially 60 degrees. Of course, the present invention is not limited thereto. In some embodiments, the angle γ may be in a range of greater than or equal to 45 degrees and less than or equal to 80 degrees.

[0037] Through the above configuration, it is beneficial for the pre-solidified glue grooves 150A-150C to be staggered with the third direction limit column 140Z, so as to avoid the glue overflow of the pre-solidified glue grooves 150A-150C between the first housing 100 and the first lens 300A, causing the eyepiece optical module 10 to be eccentrically arranged, and it is beneficial for the correct assembly while accurately aligning the first lens 300A. Similarly, the second lens 300B can also have three pre-solidified glue grooves and dispensing materials (not shown) disposed therein on the side of the first housing 100 away from the first lens 300A, so as to pre-fix the second lens 300B. The relevant configuration and function can be referred to the above paragraphs, which will not be repeated here.

[0038] Fig. 10A and Fig. 10BThis is a schematic diagram of the assembly of the second lens and the first housing of the eyepiece optical module according to an embodiment of the present invention. Figure 3 , FIG. 10A to FIG. 11B After the first lens 300A and the second lens 300B are pre-fixed via the pre-cured adhesive grooves 150A to 150C, a first lens adhesive layer 130B may be further provided to bond the first lens 300A to the first housing 100 , and a second lens adhesive layer 130C may be provided to bond the second lens 300B to the first housing 100 .

[0039] In detail, Figure 3 , Fig. 10A and Fig. 10B As shown, a lens adhesive groove 160B may be formed around the second lens 300B and between the first housing 100. The second lens adhesive layer 130C may be further disposed in the lens adhesive groove 160B and completely surround the circumference of the second lens 300B so as to connect the second lens 300B to the first housing 100. Similarly, Figure 3 , Fig.11A and Fig. 11B As shown, there is a substantially circular portion around the first lens 300A, and a lens adhesive groove 160A can be formed between the first lens 300A and the first housing 100. The first lens adhesive layer 130B can be further disposed in the lens adhesive groove 160A. In detail, the first lens adhesive layer 130B can be further divided into a first portion 131B, a second portion 132B and a third portion 133B. The first lens 300A can have an imaginary symmetry axis in the direction Y, and the second portion 132B and the third portion 133B can be respectively disposed on opposite sides of the above-mentioned symmetry axis. The symmetry axis can further pass through the first portion 131B. However, the present invention is not limited to this. It is worth mentioning that each portion of the first lens adhesive layer 130B can maintain a certain distance from the aforementioned first direction limiting column 140X, the second direction limiting column 140Y and the supporting cylinders 110A~110C, and is not coated on the above-mentioned components.

[0040] The above configuration is advantageous for fixing the first lens 300A and the second lens 300B within the limited volume of the first housing 100, and preventing the first lens 300A and the second lens 300B from falling or being separated due to external force after being assembled to the first housing 100, thereby increasing the reliability of the connection between the components and reducing the probability of colloid overflow.

[0041] Please continue to refer to Figure 3 , Figure 4 B to Figure 4After the first lens 300A and the second lens 300B are bonded to the first housing 100, the first housing 100 and the second housing 200 may be further bonded together via the first adhesive layer 130A. Figure 4 C of the first housing 100 on the platform 120, and Figure 7 The platform 220 of the second housing 200 in B), a space can be formed between the two platforms. The first adhesive layer 130A can have a first part 131A, a second part 132A and a third part 133A and are arranged in the above space. And further satisfy the following conditional formula: 230 degrees ≦ β ≦ 270 degrees, where β is the angle covered by the third part 133A in the first adhesive layer 130A in the platform relative to the center O, but the present invention is not limited to this. In some embodiments, the first part 131A and the second part 132A can be omitted. This can help prevent the first housing 100 and the second housing 200 from falling off or being separated by external force after assembly.

[0042] In some embodiments, the three supporting columns 110A-110C (i.e. Figure 4 A to Figure 4 In C, the distance between any one of the three guide grooves 210A-210C and the first adhesive layer 130A and the supporting position of the three supporting cylinders 110A-110C can be greater than or equal to 0.5 mm. Figure 4 In the enlarged view of C, the distance D between the opposite sides of the guide groove 210A and the third part 133A of the first adhesive layer 130A can be greater than or equal to 0.5 mm. However, the present invention is not limited to this. In some embodiments, the size of the distance D can be about 1.4 mm. The supporting cylinders 110B~110C can also have the above configuration, which is not repeated here. Through the above configuration, the first adhesive layer 130A and the supporting cylinders 110A~110C and the guide grooves 210A~210C can maintain a certain distance to avoid the distance between the components being too close, which interferes with image recognition during assembly. And the adhesive layer 130A is not arranged in the guide grooves 210A~210C, which can further reduce the risk of glue overflow of the adhesive layer 130A. It is worth mentioning that since the distance D and the width of the guide groove 210A are smaller than the proportion of the outer space of the first shell 100, Figure 4 The range drawn by the angle β in B can be approximately the angle range covered by the third portion 133A relative to the center O in the platform.

[0043] Figure 5 A to Figure 5 C is an eyepiece optical module according to an embodiment of the present invention, Figure 4 An enlarged schematic diagram of section line AA' of B is drawn. Figure 6 A to Figure 6 C is an eyepiece optical module according to an embodiment of the present invention, Figure 4 An enlarged schematic diagram of section line BB' of B. Figure 7 A to Figure 7 C is an eyepiece optical module according to an embodiment of the present invention, Figure 4 An enlarged schematic diagram of section line C-C' of B. Figure 5 FIG. B further illustrates the bonding between the first lens 300A, the first housing 100 and the second housing 200. Figure 5 It can be seen from B that a lens adhesive groove 160A may be formed between the circumference CL of the first lens 300A and the first housing 100, and the first lens adhesive layer 130B may be further disposed in the lens adhesive groove 160A.

[0044] On the other hand, Figure 5 FIG. C further illustrates the bearing situation between the first housing 100 and the second housing 200 and between the bearing cylinder 110A and the guide groove 210A. Figure 5 As shown in FIG. 3C , the height H1 of the supporting cylinder 110A of the hardware component allows a distance to be maintained between the first housing 100 and the second housing 200 .

[0045] Please refer to Figure 6 A to Figure 6 C, and since the section line BB' does not pass through the positions of the supporting cylinders 110A-110C and the guide grooves 210A-210C, only the bonding between the first adhesive layer 130A and the first housing 100 and the second housing 200 can be seen in the figure. Similar to the above, the first adhesive layer 130A is formed in the space formed by the platform 120 and the platform 220, and the first lens adhesive layer 130B is formed in the lens adhesive groove 160A formed between the circumference CL and the first housing 100.

[0046] Please refer to Figure 7 A to Figure 7 C, and since the section line CC' passes through the position of the supporting cylinder 110C and the guide groove 210C, Figure 7 In C, it can be seen that the supporting relationship between the supporting cylinder 110C and the guide groove 210C is supported by each other, and Figure 7 B shows the bonding state of the first adhesive layer 130A between the first housing 100 and the second housing 200. Thus, during assembly, the first adhesive layer 130A disposed in the space formed by the platform 120 and the platform 220 can be subjected to uniform force, thereby reducing the probability of the first adhesive layer 130A overflowing to other components.

[0047] Figure 8FIG. 1 is a top view of a first housing according to another embodiment of the present invention. Figure 8 , the size of the supporting cylinders 110A-110C of the eyepiece optical module 10 may also include the following conditional expressions: 0.20≦r 1 / H 1≦4.40 and 45.00≦ODh / r 1≦190.00, wherein r 1 is the radius of the supporting cylinders 110A-110C, H 1 is the height of the supporting cylinders 110A-110C, and ODh is the maximum outer diameter of the first housing 100. For example, if the center O of the first housing 100 is taken as the center of the circle, the maximum outer diameter ODh is, for example, the radius of the circumscribed circle of the projection shape of the first housing 100 on the element surface (i.e., the projection on the plane formed by the direction X and the direction Y). In some embodiments, the following conditional expressions may also be further satisfied: 0.80≦r 1 / H1≦2.80 and 75.00≦ODh / r 1≦165.00. Under the above conditions, the eyepiece optical module 10 can also achieve the effects of reducing the risk of glue overflow and facilitating assembly. The relevant principles and features can be referred to in the above paragraphs and will not be elaborated here.

[0048] In some embodiments, the size of the first housing 100 may further satisfy the following conditional formula: 45.00≦Lla / r1≦185.00, where Lla is the length of the major axis of the first housing 100 in the direction X. In some embodiments, the following conditional formula may be further satisfied: 75.00≦Lla / r 1≦160.00, or: 47.63≦Lla / r 1≦183.01. On the other hand, the following conditional formula may be further satisfied: 40.00≦Lsa / r 1≦175.00, where Lsa is the length of the minor axis of the first housing 100 in the direction Y. On the other hand, the following conditional formula may be further satisfied: 70.00≦Lsa / r 1≦150.00, or: 45.20≦Lsa / r 1≦173.69. Through the above configuration, the major axis Lla and the minor axis Lsa can be appropriately designed to avoid the radius r1 of the supporting cylinders 110A-110C being too small to cause damage due to misalignment during assembly, or the radius r1 being too large to increase the risk of glue overflow.

[0049] 9A to 9C1 is a side view schematic diagram, a top view schematic diagram and a cross-sectional view schematic diagram of the supporting cylinder and the guide groove of the embodiment of the present invention. It should be noted that the supporting cylinder 110A and the guide groove 210A are used for exemplary description here, and the design of the supporting cylinders 110B~110C and the guide grooves 210B~210C can be the same as that of the supporting cylinder 110A and the guide groove 210A, which will not be repeated here. The supporting cylinders 110A~110C and the guide grooves 210A~210C can be further designed. Taking the supporting cylinders 110A~110C being arranged on the first housing 100 as an example, the shape of the end of the supporting cylinders 110A~110C away from the first housing 100 can be a truncated cone. And further satisfy the following conditional formula: 0 mm ≦ H2 ≦ 6.68 mm; 0.80 ≦ r 1 / r3 ≦ 1.00; and 0.80 ≦ r2 / r4 ≦ 1.20. Wherein H2 is the difference between H1 and the height of the truncated cone; r2 is the radius of the other end of the supporting cylinder 110A-110C, that is, the radius of the connection between the supporting cylinder 110A-110C and the first housing 100; r3 is the curvature radius of the bottom of the guide groove 210A-210C, and r4 is the curvature radius of the top of the guide groove 210A-210C. The bottom referred to above may be the portion where the guide groove 210A-210C and the supporting cylinder 110A-110C are actually in contact when supporting each other, and the top referred to above may be the outermost contour portion of the guide groove 210A-210C in appearance.

[0050] By designing the supporting columns 110A-110C and the guide grooves 210A-210C to have inner radii (i.e., radius r1 and curvature radius r3) and outer radii (i.e., radius r2 and curvature radius r4), the probability of misalignment when assembling and aligning the first housing 100 and the second housing 200 can be reduced.

[0051] On the other hand, the dimensions of the guide grooves 210A-210C may be further limited. For example, the depth H3 of the guide grooves 210A-210C is greater than or equal to 0.005 mm. When the depth H3 is large enough, it is beneficial to the image recognition when the first housing 100 and the second housing 200 are assembled, so as to improve the assembly yield of the eyepiece optical module 10.

[0052] Table 1

[0053] r1(mm) <![CDATA[Area (mm 2 )]]> <![CDATA[Total area (mm 2 )]]> Size Limits 0.317 0.316 0.948

[0054] Table 1 is a parameter table based on the design of the dimensions of the supporting cylinders 110A-110C of the present invention. When the first shell 100 and the second shell 200 are assembled, the material yield strength (i.e., the limit stress of the first shell 100 and the second shell 200 to resist deformation) is about 62Mpa (million Pascals, unit is 10 6 N / m 2 =1N / mm2 ), and the maximum force between the first housing 100 and the second housing 200 during the assembly process is about 6 kilograms (Kgw). Under the above restrictions, the contact area between the first housing 100 and the second housing 200 must be at least 0.948mm 2 (square millimeters) to ensure the reliability of both the first housing 100 and the second housing 200 during assembly. If the first housing 100 and the second housing 200 are in contact with each other using three supporting cylinders 110A to 110C, the area of ​​any one of the three supporting cylinders 110A to 110C must be at least 0.948 / 3 = 0.316 (mm 2 ), the radius r1 of the bottom surface of any one of the supporting cylinders 110A-110C must be at least about 0.317 mm.

[0055] Table 2

[0056]

[0057] Table 2 is a table of corresponding values ​​of the parameters of the components mentioned above. In order to meet the conditions described in Table 1, the parameters can correspond to Table 2. It should be noted that since the radius r1 of the bottom surface of the supporting cylinder 110A~110C must be at least 0.317 (mm). The process tolerance value is about 0.05 (mm), so the minimum value of the radius r1 can be 0.317+(0.05 / 2)=0.342 (mm) in consideration of the tolerance. Similarly, Fig.9A The radius r2 of the bottom surface of the other end of the middle supporting cylinder 110A-110C is greater than the radius r1, and the minimum value of the radius r2 can be 0.342+(0.05 / 2)=0.367 (mm). On the other hand, in order to meet the tolerances of the height H1 and the depth H3 of 0.02 (mm), the processing tolerance of the platform of 0.06 (mm), and the interval of 0.2 mm reserved for glue dispensing, the height H1 of the supporting cylinder 110A-110C can be 0.02+0.02+0.06+0.2=0.3 (mm). Under the above conditions, the supporting cylinder 110A-110C and the guide groove 210A-210C of the present invention can play a good supporting function, so that the eyepiece optical module 10 can achieve the above-mentioned technical effects.

[0058] Based on the above, the eyepiece optical module of the embodiment of the present invention is assembled with a supporting cylinder. Since the supporting surface is circular, it is convenient for mold processing, and at the same time reduces the risk of excessive local stress, and increases the supporting area when the assembly is misaligned under the same assembly accuracy, which is conducive to lightweight and reducing material costs. In addition, the first shell and the second shell are in direct contact with each other by means of three supporting cylinders, so that the adhesive layer between the two shells is less likely to overflow during assembly, avoiding the risk of offset and yield reduction when the first shell and the second shell are assembled. On the other hand, it also avoids the problem that when the number of supporting cylinders is less than 3, the first shell and the second shell cannot effectively support each other during assembly, which easily causes tilting.

[0059] Moreover, when the above two conditions are met, even under certain precision, material yield strength and applied force (e.g. 0.05 mm, 6 MPa and 6 kgw), it is also beneficial for the eyepiece optical module to assemble the first shell and the second shell by using the dispensing method. This can avoid the risk of misalignment and damage during assembly due to the small radius of the supporting cylinder, or the risk of glue overflow due to the large radius. Furthermore, by designing the supporting cylinder and the guide groove to interlock with each other, the probability of misalignment during assembly of the first shell and the second shell can be greatly reduced, and the assembly is convenient and the assembly yield is improved.

[0060] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person having ordinary knowledge in the technical field may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. An eyepiece optical module, characterized in that: include: a first housing; a second housing, wherein one of the first housing and the second housing comprises at least three supporting cylinders, the other comprises at least three guide grooves, and only the supporting cylinders are in direct contact with the guide grooves between the first housing and the second housing; a lens disposed between the first housing and the second housing, wherein the first housing and the second housing are bonded via an adhesive layer; Any one of the three supporting cylinders satisfies the following conditions: 0.20≦r1 / H1≦4.40 and 0.34 mm≦r1≦1.35 mm, wherein r1 is the radius of the end of the supporting cylinder away from the first shell, and H1 is the height of the supporting cylinder.

2. An eyepiece optical module, characterized in that: include: a first housing; a second housing, wherein one of the first housing and the second housing comprises three supporting cylinders, the other comprises three guide grooves, and only the three supporting cylinders are in direct contact with the three guide grooves between the first housing and the second housing; a lens disposed between the first housing and the second housing, wherein the first housing and the second housing are bonded via an adhesive layer; Any one of the three supporting cylinders satisfies the following conditions: 0.20≦r1 / H1≦4.40 and 45.00≦ODh / r1≦190.00, wherein r1 is the radius of one end of the supporting cylinder away from the first shell, H1 is the maximum height of the supporting cylinder, and ODh is the maximum outer diameter of the first shell.

3. The eyepiece optical module according to claim 1 or 2, characterized in that: The first shell and the second shell have a center, and any two of the three supporting cylinders form two connecting lines with the center and satisfy the following condition: 90 degrees≦α≦135 degrees, wherein α is the angle between the two connecting lines.

4. The eyepiece optical module according to claim 3, characterized in that: The first shell and the second shell each have a platform, the platforms form a space, the adhesive layer is arranged in the space, and further satisfies the following condition: 230 degrees ≦ β ≦ 270 degrees, wherein β is the angle covered by the adhesive layer in the platform relative to the center.

5. The eyepiece optical module according to claim 4, characterized in that: The distance between any one of the three supporting cylinders and the adhesive layer is greater than or equal to 0.5 mm.

6. The eyepiece optical module according to claim 1 or 2, characterized in that: The first shell further satisfies the following condition: 45.00≦Lla / r1≦185.00, wherein Lla is the length of the major axis of the first shell.

7. The eyepiece optical module according to claim 1 or 2, characterized in that: The first shell further satisfies the following condition: 40.00≦Lsa / r1≦175.00, wherein Lsa is the length of the short axis of the first shell.

8. The eyepiece optical module according to claim 1 or 2, characterized in that: The first housing has a first direction limiting column, two second direction limiting columns and three third direction limiting columns, wherein the first direction, the second direction and the third direction are perpendicular to each other, and the first direction limiting column, the second direction limiting columns and the third direction limiting columns directly contact the lens.

9. The eyepiece optical module according to claim 8, characterized in that: The first shell has a center and three pre-curing glue grooves. The line formed by any one of the three pre-curing glue grooves and the center, and the line formed by any one of the three third-direction limiting columns and the center have an angle greater than or equal to 45 degrees.

10. The eyepiece optical module according to claim 1 or 2, characterized in that: The lens has a circumference, and a lens adhesive groove is formed between the circumference and the first housing.

11. The eyepiece optical module according to claim 1 or 2, characterized in that: The end of the supporting cylinder is a truncated cone and further satisfies the following conditional formula: 0 mm ≦ H2 ≦ 6.68 mm; 0.80≦r1 / r3≦1.00; and 0.80≦r2 / r4≦1.20， Wherein H2 is the difference between H1 and the height of the truncated cone, r2 is the radius of the connection between the supporting cylinder and the first shell, r3 is the curvature radius of the bottom of the guide groove, and r4 is the curvature radius of the top of the guide groove.

12. The eyepiece optical module according to claim 1 or 2, characterized in that: The depth of the guide groove is greater than or equal to 0.005 mm.

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