Lens

Abstract

The present invention relates to a lens comprising: a lens barrel; the plurality of lenses are arranged in the lens barrel, and the optical effective diameters of the plurality of lenses are gradually reduced from the front end to the rear end of the lens barrel; the gland is arranged at the front end of the lens cone and is pressed on the first lens; wherein the lens barrel is provided with a boss, one end of the gland is located above the boss, a glue storage groove is formed between the gland and the boss in a spaced mode, the outer wall of the lens barrel is further provided with a glue stopping groove, and the glue stopping groove is adjacent to the glue storage groove and located in the direction, facing the rear end of the lens barrel, of the glue storage groove. According to the lens, the glue storage groove is formed between the gland and the lens barrel, so that the glue dispensing position can be observed from the outside, the glue dispensing quality can be confirmed, and glue leakage can be found in time.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses and optical electronic devices, and in particular to a lens. Background Art

[0002] In conventional mobile phone lens applications, due to the constraints of the phone's spatial layout requirement of "small head, large image surface," the optical system design is mostly pre-positioned with an aperture, and the optical effective diameter size from the first optical lens to the last increases from small to large. Based on this, the conventional optical lens structure is designed as a normal mount. However, in automotive or VR / AR headset optical lens applications, or certain types of mobile phone applications, high light throughput and large FOV imaging are required. For this type of optical system design, the aperture is mostly positioned in the center, and the optical effective diameter size from the first optical lens to the last decreases from large to small. Based on this, considering the manufacturability and mass production in actual production, the lens structure needs to be designed using a flip-chip method.

[0003] like Figure 1 As shown in the figure, in a conventional flip-chip structure design, the front end of the lens uses a locking cover or a lens barrel heat-sealing process. In the conventional locking cover structure, the glue is dispensed into the locking thread, which makes it difficult to perform glue appearance inspection in actual production. Firstly, it cannot help process personnel confirm the glue dispensing parameters. Secondly, it is easy to cause glue leakage points to be unable to be discovered in time, leading to product reliability verification problems. Summary of the Invention

[0004] In order to solve the technical problems existing in the above-mentioned prior art, the present invention aims to propose a lens, the front end of which adopts a pressure cover structure, and the glue dosing position where the pressure cover is connected to the lens can be observed from the outside, thereby helping to confirm the glue dosing quality and timely discover glue leakage.

[0005] To achieve the above-mentioned purpose of the present invention, the lens of an embodiment of the present invention includes: a lens barrel; a plurality of lenses, arranged in the lens barrel, and the optical effective diameters of the plurality of lenses gradually decrease from the front end to the rear end of the lens barrel; a pressure cover, arranged at the front end of the lens barrel and pressed on the first of the lenses; wherein the lens barrel has a boss, one end of the pressure cover is located above the boss and a glue storage groove is formed between the pressure cover and the boss.

[0006] Furthermore, the pressing cover includes: a main body portion, which is pressed on the first lens; an extension portion, which extends from the edge of the main body portion to one side, and the glue storage groove is formed between the extension portion and the boss.

[0007] Furthermore, a first matching section is provided between the main body and the first lens, and a second matching section is provided between the extension portion and the lens barrel.

[0008] Furthermore, a glue-stopping groove is provided on the outer wall of the lens barrel. The glue-stopping groove is arranged adjacent to the glue storage groove and is located in the direction of the glue storage groove toward the rear end of the lens barrel.

[0009] Furthermore, a glue-blocking groove is provided on the outer wall of the lens barrel. The glue-blocking groove is arranged adjacent to the glue-stopping groove and is located in the direction of the glue-stopping groove toward the rear end of the lens barrel.

[0010] Furthermore, the lens barrel and the pressure cover are made of PC material, or PC material mixed with glass fiber and / or ITO and / or SiO2 and / or TiO2 and / or Al2O3 and / or ZrO2; the lens is made of all plastic material or a glass-plastic mixed material.

[0011] Furthermore, the thickness of the main body is T≥0.25mm; the extension portion has a guide slope at one end facing the glue storage tank, and the angle between the guide slope and the radial direction of the lens barrel is λ≥3°; the length of the first fitting segment is A≥0.15mm; the length of the second fitting segment is B≥0.2mm.

[0012] Furthermore, the angle α between the boss and the radial direction of the lens barrel is ≤87°; and the distance between the end of the pressure cover and the boss is F=0.02-0.05 mm.

[0013] Furthermore, the glue-stopping groove is sawtooth-shaped, with a tooth height of C≥0.02 mm, a tooth angle of θ=60-70°, and the number of teeth is more than two.

[0014] Furthermore, the width of the glue retaining groove is D≥0.1mm, and the height of the groove is E≥0.02mm.

[0015] The lens of the embodiment of the present invention has a pressure cover provided at the front end of the lens barrel, and a glue storage groove is provided between the pressure cover and the boss on the outer wall of the lens barrel, so that the glue dispensing position can be observed from the outside. Compared with the prior art of dispensing glue inside the locking thread of the pressure cover, it is more conducive to confirming the glue dispensing quality and timely discovering glue leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of a flip-up lens in the prior art;

[0018] Figure 2Schematic diagram of the structure of a lens according to an embodiment of the present invention;

[0019] Figure 3 is a schematic cross-sectional view of a lens according to an embodiment of the present invention;

[0020] Figure 4 Schematic diagram of the dimensions of a lens according to an embodiment of the present invention;

[0021] Figure 5 Schematic diagram of glue overflow at different angles of the serrations of the glue-stop groove according to an embodiment of the present invention;

[0022] Figure 6 Schematic diagram of the assembly process of the lens according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The description of the embodiments in this specification should be combined with the corresponding drawings, which should be considered a complete part of this specification. In the drawings, the shapes and thicknesses of the embodiments may be exaggerated and indicated for simplicity or convenience. Furthermore, the various structural components in the drawings will be described separately. It is worth noting that components not shown in the drawings or not described in words are known to those of ordinary skill in the art.

[0024] The description of the embodiments herein and any references to directions and orientations are for ease of description only and are not to be construed as limiting the scope of the present invention. The following description of the preferred embodiments may involve combinations of features, which may exist independently or in combination. The present invention is not specifically limited to the preferred embodiments. The scope of the present invention is defined by the claims.

[0025] like Figure 2 and Figure 3 As shown, a lens according to an embodiment of the present invention includes a lens barrel 1 and a lens assembly 2 disposed within the lens barrel 1. The lens assembly 2 includes a plurality of lenses, and the optically effective diameters of the plurality of lenses of the lens assembly 2 gradually decrease from the front end to the rear end of the lens barrel 1. A pressure cap 3 is provided at the front end of the lens barrel 1, and the pressure cap 3 is pressed onto the first lens of the lens assembly 2 near the front end of the lens barrel 1. The outer wall of the lens barrel 1 has a boss 4, and one end of the pressure cap 3 is located above the boss 4 and is separated from the boss 4 by a glue storage tank 5. By dispensing glue into the glue storage tank 5, the dispensing process can be observed from the outside, making it easier to confirm the dispensing quality and to detect glue leaks in a timely manner.

[0026] like Figure 3As shown, in this embodiment, the pressure cap 3 includes a main body 6 and an extension 7. The main body 6 can be an annular structure, coplanar with the radial plane of the lens barrel 1. The extension 7 extends from the edge of the main body 6 to one side, specifically, along the axial direction of the lens barrel 1. The pressure cap 3 is pressed against the first lens of the lens assembly 2 near the front end through the main body 6, and the extension 7 surrounds the outer wall of the lens barrel 1. The glue reservoir 5 is located between the end of the extension 7 near the rear end of the lens barrel 1 and the boss 4, which can be an annular boss. A first mating section L1 is in contact between the main body 6 and the first lens, and a second mating section L2 is in contact between the extension 7 and the lens barrel 1. A hollow space is defined between the first mating section L1 and the second mating section L2 (i.e., the pressure cap 3 does not contact the lens barrel 1 or the lens assembly 2 at the bend). Hot melt adhesive is disposed in this space to bond the lens assembly 2 to the lens barrel 1. The function of the pressing cover 3 is to press the lens group 2 into the lens barrel 1 through the first mating section L1. However, considering that the pressing by the pressing cover 3 alone may not be stable, for example, although the lens group 2 is pressed in the axial direction, it may shake in the radial direction. Therefore, hot melt adhesive is provided in the aforementioned space to strengthen the fixation of the lens group 2 and the lens barrel 1.

[0027] like Figure 2 As shown, in this embodiment, the outer wall of the lens barrel 1 further has a glue stop groove 8, which is disposed adjacent to the glue storage tank 5 and located in the direction from the glue storage tank 5 toward the rear end of the lens barrel 1. The glue stop groove 8 is serrated. Compared with a smooth surface, the serrated glue stop groove 8 can prevent glue overflowing from the glue storage tank 5 from further overflowing, effectively avoiding the problem of a small amount of glue overflowing.

[0028] like Figure 2 As shown, in this embodiment, a glue stopping groove 9 is further provided on the outer wall of the lens barrel 1. The glue stopping groove 9 is arranged adjacent to the glue stopping groove 8 and is located in the direction of the glue stopping groove 8 toward the rear end of the lens barrel 1. The glue stopping groove 8 can prevent a small amount of glue from overflowing. When the amount of overflowed glue is too large, the glue stopping groove 8 cannot be controlled, and the overflowed glue is accommodated by the glue stopping groove 9 to further prevent overflow of glue.

[0029] In this embodiment, the lens barrel 1 and the gland 3 are made of PC, or PC mixed with glass fiber and / or ITO and / or SiO2 and / or TiO2 and / or Al2O3 and / or ZrO2. The lenses of the lens assembly 2 are made of all plastic or a glass-plastic hybrid.

[0030] like Figure 4As shown, in this embodiment, the thickness of the main body 6 is T≥0.25mm. The end of the extension portion 7 facing the glue storage tank 5 has a guide slope (not marked), and the angle between the guide slope and the radial direction of the lens barrel 1 is λ≥3°. The length of the first mating section L1 is A≥0.15mm, and the first mating section L1 is provided with a thermosetting glue. The length of the second mating section L2 is B≥0.2mm, and the glue storage tank 5 is provided with a hydrosol. The angle α between the boss 4 and the radial direction of the lens barrel 1 is ≤87°. The distance between the end of the pressure cover 3 and the boss 4 is F=0.02-0.05mm. The glue stop groove 8 is configured to be serrated, with a tooth height of C≥0.02mm, a tooth angle of θ=60-70°, and more than two teeth. The width of the glue retaining groove 9 is D≥0.1mm, and the height is E≥0.02mm. At the same time, the groove height E should be greater than the tooth height C. Preferably, in order to cope with the situation of excessive glue overflow, EC≥0.05mm.

[0031] like Figure 5 As shown in the figure, when the glue stop groove 8 is set to a sawtooth shape, the relationship between the angle of the teeth and the amount of glue overflow is shown. The horizontal axis is the angle of the teeth and the vertical axis is the amount of glue overflow. As mentioned in the previous paragraph, the angle of the teeth is preferably θ = 60-70°. Figure 5 It can be confirmed that the glue overflow rate is the smallest at 30-35% within the 60-70° range. When θ is less than 60° or greater than 70°, the glue overflow rate increases. Considering factors such as manufacturing and processing costs, setting θ to 60-70° can take multiple factors into consideration.

[0032] like Figure 6 As shown, the embodiment of the present invention further provides steps for assembling the lens as above:

[0033] (1) Assembling the lens group by an automatic assembly machine to assemble the lens group into the lens barrel;

[0034] (2) Gluing of lens assembly: add glue dispensing function to the automatic assembly machine and do glue dispensing on the edge of L1. The glue is thermosetting glue.

[0035] (3) Assemble the gland and assemble it on the lens;

[0036] (4) Glue dispensing on the gland: the glue dispensing needle is placed on the outer wall of the gland. The glue is: hydrosol;

[0037] (5) Press and fix the gland, the pressing time is ≥ 2 seconds, the overpressure is 0.1mm-1mm, and the specific amount is determined according to the gland size;

[0038] (6) Appearance inspection: check the appearance of the lens dispensing to confirm whether the product is dispensed and whether the dispensing appearance meets the product requirements;

[0039] (7) baking in an oven to cure the lens at 85-95°C for 0.5-1 hour;

[0040] (8) Thrust test: perform a thrust test on the lens to confirm the firmness of the pressure cover. The thrust requirement is greater than 10kg, which is determined by the size of the pressure cover.

[0041] In addition, a group of semi-finished lenses without capping can be added at the same time to test the thrust of the semi-finished lenses so that process personnel can disassemble and analyze the thrust.

[0042] In addition, in this embodiment, water-soluble glue is used to connect the pressure cover 3 and the lens barrel 1 because the water-soluble glue has better viscosity, and thermosetting glue is used to connect the lens group 2 and the lens barrel 1 because water-soluble glue is also a solvent and can easily have an adverse effect on the lens or the coating on the lens surface, while thermosetting glue is a physical adhesive and will not affect the lens.

[0043] The lens of the embodiment of the present invention has a pressure cover provided at the front end of the lens barrel, and a glue storage groove is provided between the pressure cover and the boss on the outer wall of the lens barrel, so that the glue dispensing position can be observed from the outside. Compared with the prior art of dispensing glue inside the locking thread of the pressure cover, it is more conducive to confirming the glue dispensing quality and timely discovering glue leakage.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A lens, characterized in that: include: Lens tube (1); A lens group (2) is arranged in the lens barrel (1), the lens group (2) comprises a plurality of lenses, and the optical effective diameters of the plurality of lenses of the lens group (2) gradually decrease from the front end to the rear end of the lens barrel (1); A pressure cover (3) is arranged at the front end of the lens barrel (1) and presses on the first lens of the lens group (2) close to the front end of the lens barrel (1); The lens barrel (1) has a boss (4), one end of the pressure cover (3) is located above the boss (4) and is separated from the boss (4) to form a glue storage groove (5), and the outer wall of the lens barrel (1) also has a glue stop groove (8), and the glue stop groove (8) is arranged adjacent to the glue storage groove (5) and is located in the direction of the glue storage groove (5) toward the rear end of the lens barrel (1).

2. The lens according to claim 1, wherein: The gland (3) comprises: a main body (6) pressing on the first lens; An extension portion (7) extends from the edge of the main body portion (6) toward the rear end of the lens barrel (1), and the glue storage groove (5) is formed between the extension portion (7) and the boss (4).

3. The lens according to claim 2, wherein: A first matching section (L1) is provided between the main body (6) and the first lens, and a second matching section (L2) is provided between the extension portion (7) and the lens barrel (1).

4. The lens according to claim 1, wherein: The outer wall of the lens barrel (1) is further provided with a glue-blocking groove (9), which is arranged adjacent to the glue-stopping groove (8) and is located in a direction from the glue-stopping groove (8) toward the rear end of the lens barrel (1).

5. The lens according to any one of claims 1 to 4, characterized in that: The lens barrel (1) and the gland (3) are made of PC material, or PC material mixed with glass fiber and / or ITO and / or SiO2 and / or TiO2 and / or Al2O3 and / or ZrO2; The lenses of the lens set (2) are made of all plastic material or a glass-plastic mixed material.

6. The lens according to claim 3, wherein: The thickness of the main body (6) is T≥0.25mm; One end of the extension portion (7) facing the glue storage tank (5) has a flow guiding slope, and the angle between the flow guiding slope and the radial direction of the lens barrel (1) is λ≥3°; The length of the first fitting section (L1) is A≥0.15mm; The length of the second fitting section (L2) is B≥0.2 mm.

7. The lens according to any one of claims 1 to 4, characterized in that: The angle α included between the boss (4) and the lens barrel (1) in a radial direction is ≤87°.

8. The lens according to claim 1, wherein: The distance between the end of the pressure cover (3) and the boss (4) is F=0.02-0.05 mm.

9. The lens according to claim 1, wherein: The glue-stop groove (8) is sawtooth-shaped, with a tooth height of C≥0.02mm, a tooth angle of θ=60-70°, and the number of teeth is more than two.

10. The lens according to claim 3, wherein: The width of the glue retaining groove (9) is D≥0.1mm, and the height is E≥0.02mm.

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