Optical lens

Abstract

The utility model provides an optical lens, comprising a lens group, from an object side to an image side of the optical lens, the lens group at least comprises an object end lens, a middle lens and an image end lens, the object end lens is a lens closest to the object side in the optical lens, and the image end lens is a lens closest to the image side in the optical lens; the outer ring surface of the middle lens leans against the inner ring surface of the bearing space ring; the fixed pressing ring at least partially abuts against the image side face of the middle lens, and the fixed pressing ring is connected with the abutting space ring through a bonding part; the lens barrel, the bearing space ring, the lens group and the fixed pressing ring are accommodated in the lens barrel, and the outer ring surface of the bearing space ring is supported on the inner wall surface of the lens barrel. The problem that high performance and good assembly stability of an optical lens in the prior art are difficult to consider at the same time is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical imaging equipment technical field, specifically, relate to an optical lens. BACKGROUND

[0002] In the current optical lens and optical imaging module field, especially in the high-precision imaging system applied to electronic devices such as smart phones, tablet computers, notebook computers and video conference cameras, the lens with excellent optical performance such as high refractive index and good transmittance is widely used in optical lens design, especially as a middle lens. However, the middle lens made of glass material often has a small outer diameter and limited structure design due to its high hardness and difficulty in cold processing, which makes the structure design freedom of the optical lens low, the assembly stability poor, and the performance and yield of the whole optical lens obviously affected.

[0003] That is, the optical lens in the prior art has the problem that high performance and good assembly stability are difficult to balance. SUMMARY

[0004] The main purpose of the utility model is to provide an optical lens to solve the problem that high performance and good assembly stability are difficult to balance in the prior art.

[0005] In order to achieve the above purpose, the utility model provides an optical lens, which comprises a lens group, from the object side to the image side of the optical lens, the lens group at least comprises an object end lens, a middle lens and an image end lens, the object end lens is the lens closest to the object side in the optical lens, and the image end lens is the lens closest to the image side in the optical lens;The outer ring surface of the middle lens is supported on the inner ring surface of the supporting spacer;The fixed pressure ring is at least partially supported on the image side surface of the middle lens, and the fixed pressure ring and the supporting spacer are connected through the adhesive part;The supporting spacer, the lens group and the fixed pressure ring are accommodated in the lens barrel, and the outer ring surface of the supporting spacer is supported on the inner wall surface of the lens barrel.

[0006] Further, the length C of the outer ring surface of the fixed pressure ring and the inner ring surface of the supporting spacer along the direction of the optical axis of the optical lens satisfies: C>0.1mm.

[0007] Further, the image side surface of the fixed pressure ring and the inner ring surface of the supporting spacer are bonded by the adhesive part, and the maximum height H of the adhesive part along the direction of the optical axis of the optical lens satisfies: H>0.05mm.

[0008] Further, the image side surface of the fixed pressure ring and the inner ring surface of the supporting spacer are bonded by the adhesive part, and the maximum width L of the adhesive part along the direction perpendicular to the optical axis of the optical lens satisfies: L>0.15mm.

[0009] Further, the bearing spacer comprises a lens barrel bearing portion, the lens barrel bearing portion has an outer annular surface of the bearing spacer; a lens bearing portion, the lens bearing portion extends from the object side end of the lens barrel bearing portion to the direction close to the optical axis of the optical lens, the object side surface of the middle lens is supported on the image side of the lens bearing portion.

[0010] Further, the maximum thickness A of the lens bearing portion in the direction of the optical axis satisfies: A>0.1mm.

[0011] Further, the maximum thickness A of the lens bearing portion in the direction of the optical axis satisfies: A>0.1mm.

[0012] Further, the maximum thickness A of the lens bearing portion in the direction of the optical axis satisfies: A>0.1mm.

[0013] Further, the material of the bearing spacer is PC plastic; and / or the material of the fixed compression ring is PC plastic; and / or the material of the middle lens is glass; and / or the material of the adhesive portion is one of water-based glue, ultraviolet curing glue or heat curing glue.

[0014] Further, the image side surface of the middle lens comprises: a bearing annular surface, the bearing annular surface extends in the direction perpendicular to the optical axis of the optical lens, the fixed compression ring is supported on the bearing annular surface; a give-way annular surface, the give-way annular surface is located on the image side of the bearing annular surface and close to the optical axis relative to the outer annular surface of the middle lens, and the give-way annular surface is spaced apart from the fixed compression ring.

[0015] The technical scheme of the utility model discloses an optical lens, which comprises a lens group, a bearing spacer, a fixed compression ring and a lens barrel, from the object side to the image side of the optical lens, the lens group comprises at least an object end lens, a middle lens and an image end lens, the object end lens is the lens closest to the object side in the optical lens, and the image end lens is the lens closest to the image side in the optical lens, the outer annular surface of the middle lens is supported on the inner annular surface of the bearing spacer, the image side surface of the middle lens is at least partially supported on the fixed compression ring, the fixed compression ring is connected with the bearing spacer through an adhesive portion, the bearing spacer, the lens group and the fixed compression ring are accommodated in the lens barrel, and the outer annular surface of the bearing spacer is supported on the inner wall surface of the lens barrel.

[0016] The optical lens of the present application considers that the middle lens is different from the object end lens and the image end lens, cannot be directly supported on the lens barrel and there is no position for auxiliary support on the object side and the image side, the middle lens with a small outer diameter is supported on the inner annular surface of the supporting spacer ring by introducing the supporting spacer ring, and the fixed pressing ring is supported on the image side of the middle lens to be fixed, so that the middle lens is supported on the lens barrel by the supporting spacer ring, the radial limit is ensured, the fixed pressing ring is used to provide the limit and support in the axial direction to keep stable support, the assembly stability of the optical lens is enhanced, the performance, yield and reliability of the optical lens are improved, and the imaging quality of the optical lens is ensured to be stable. BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof serve to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 A cross-sectional view of part of the structure of the optical lens of one optional embodiment of the present application is shown;

[0019] Figure 2 A cross-sectional view of the supporting spacer ring in Figure 1 is shown.

[0020] Among them, the above drawings include the following reference signs:

[0021] 1, lens barrel; 2, supporting spacer ring; 21, lens barrel supporting part; 22, lens supporting part; 3, middle lens; 31, supporting annular surface; 32, position giving annular surface; 4, fixed pressing ring; 5, adhesive part. DETAILED DESCRIPTION

[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0023] It should be noted that, unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as that generally understood by the ordinary skilled person in the technical field to which the present application belongs.

[0024] In the present application, unless otherwise specified, the orientation words such as "upper, lower, top, bottom" are generally directed to the directions shown in the drawings, or are directed to the vertical, perpendicular or gravity directions of the components themselves; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of each component itself, but the above orientation words are not used to limit the present application.

[0025] In order to solve the problem that high performance and good assembly stability of the optical lens are difficult to be considered in the prior art, the utility model provides an optical lens.

[0026] As shown in Figure 1 and Figure 2 , the optical lens comprises a lens group, a bearing spacer 2, a fixed compression ring 4 and a lens barrel 1, from the object side to the image side of the optical lens, the lens group at least comprises an object end lens, a middle lens 3 and an image end lens, the object end lens is the lens closest to the object side in the optical lens, and the image end lens is the lens closest to the image side in the optical lens; the bearing spacer 2, the outer ring surface of the middle lens 3 is supported on the inner ring surface of the bearing spacer 2; the fixed compression ring 4, the image side surface of the fixed compression ring 4 and the middle lens 3 at least partially support each other, and the fixed compression ring 4 and the bearing spacer 2 are connected through an adhesive part 5; the lens barrel 1, the bearing spacer 2, the lens group and the fixed compression ring 4 are accommodated in the lens barrel 1, and the outer ring surface of the bearing spacer 2 is supported on the inner wall surface of the lens barrel 1.

[0027] The optical lens of the application considers that the middle lens 3 is different from the object end lens and the image end lens, cannot be directly supported on the lens barrel 1 and has no position for auxiliary support on the object side and the image side, the bearing spacer 2 is introduced, the middle lens 3 with a small outer diameter is supported on the inner ring surface of the bearing spacer 2, and the fixed compression ring 4 is supported on the image side of the middle lens 3 for fixation, so that the middle lens 3 is supported on the lens barrel 1 by means of the bearing spacer 2, the position in the radial direction is limited, the fixed compression ring 4 is used to provide the position in the axial direction for stable support and support, the assembly stability of the optical lens is enhanced, the performance, yield and reliability of the optical lens are improved, and the imaging quality of the optical lens is ensured to be stable.

[0028] As shown in Figure 1 , the bearing length C of the outer ring surface of the fixed compression ring 4 and the inner ring surface of the bearing spacer 2 along the optical axis direction of the optical lens satisfies: C > 0.1mm. By controlling the bearing length C, the contact area and strength of the fixed compression ring 4 and the bearing spacer 2 can meet the design requirements, so that the fixed compression ring 4 can withstand the thrust or pressure that the optical lens may encounter in the working and transportation process or the impact in the accidental situation such as equipment falling. If the size of the bearing length C is too small, the contact surface may not be able to provide stable support, resulting in displacement or deformation of the optical lens under the action of these forces, and then affecting the optical performance and service life. The sufficient bearing length size helps to ensure the close fit between the fixed compression ring 4 and the bearing spacer 2, reduce the structural instability and misplacement of the middle lens 3 caused by environmental changes, and thus improve the reliability of the whole optical lens.

[0029] As shown in Figure 1As shown, the adhesive part 5 adheres and fixes the image side surface of the pressing ring 4 and the inner annular surface of the bearing spacer 2, and the maximum height H of the adhesive part 5 along the optical axis direction of the optical lens satisfies: H > 0.05 mm. By controlling the maximum height H of the adhesive part 5 to be large enough, it is ensured that the glue can be filled smoothly to form a continuous adhesive part 5, thereby providing sufficient adhesion after curing. The setting of the maximum height H also takes into account the shrinkage during the curing of the glue, ensuring that sufficient strength can still be provided after curing.

[0030] As shown, Figure 1 As shown, the adhesive part 5 adheres and fixes the image side surface of the pressing ring 4 and the inner annular surface of the bearing spacer 2, and the maximum width L of the adhesive part 5 along the direction perpendicular to the optical axis direction of the optical lens satisfies: L > 0.15 mm. By controlling the maximum width L of the adhesive part 5 to be large enough, it is ensured that the glue can be filled sufficiently, and at the same time, the maximum width L also affects the distribution of the lateral thrust between the fixed pressing ring 4 and the bearing spacer 2 during the curing of the glue. The larger the width L, the greater the lateral force that the adhesive part 5 can withstand, which helps to improve the stability of the assembled structure.

[0031] By limiting the size of H and L to a certain range, the glue dispensing space size required by the glue dispensing process is met, ensuring that the glue can be effectively filled and form an adhesive part 5 with sufficient strength and rigidity, while not overflowing or forming bubbles to affect the performance of the optical lens. Through the fixed connection of the adhesive part 5, the fixed pressing ring 4 and the bearing spacer 2 will not cause displacement or deformation of the lens or the assembled structure when subjected to thrust.

[0032] Optionally, the material of the adhesive part 5 is one of water-based glue, ultraviolet light curing glue or heat curing glue. The water-based glue is water-based before curing and can be washed with water, which can provide certain flexibility during assembly to facilitate correction of misalignment or contamination before the glue is cured. Ultraviolet light curing glue can be rapidly cured under ultraviolet light, usually only a few seconds to a few minutes, greatly improving production efficiency and also being conducive to achieving high-quality adhesion. In addition, ultraviolet light curing glue performs excellently in optical transparency, making it suitable for the adhesion of parts in optical lenses. Heat curing glue can form a high-strength, high-hardness adhesive part after curing, providing excellent mechanical properties and chemical stability, which helps to maintain the adhesion effect for a long time and is suitable for lens products that require high reliability.

[0033] As shown, Figure 2As shown, the bearing spacer 2 comprises a lens barrel bearing part 21 and a lens bearing part 22, the lens barrel bearing part 21 has an outer ring surface of the bearing spacer 2; the lens bearing part 22 extends from the object side end of the lens barrel bearing part 21 to the direction close to the optical axis of the optical lens, and the object side surface of the middle lens 3 is supported on the image side of the lens bearing part 22. The lens barrel bearing part 21 can realize stable bearing of the bearing spacer 2 and the lens barrel 1, and the lens bearing part 22 extends from the object side of the lens barrel bearing part 21 to the optical axis, so that the object side of the middle lens 3 can be supported on the lens bearing part 22, and the middle lens 3 is limited on the image side by the fixed pressing ring 4, so that the middle lens 3 has high stability in the radial and axial directions.

[0034] As shown in the figure, Figure 2 The maximum thickness A of the lens bearing part 22 along the direction of the optical axis satisfies: A>0.1mm. By controlling the maximum thickness A of the lens bearing part 22, the strength and stability of the bearing spacer 2 are ensured, and the displacement of the middle lens 3 caused by insufficient strength of the bearing spacer 2 is avoided. In addition, the difficulty of processing and forming is also reduced, and large deformation in the baking or cooling process is avoided, and the production yield is improved.

[0035] Specifically, the size tolerance of the maximum thickness A of the lens bearing part 22 along the direction of the optical axis is within ±10um. By controlling the size tolerance of the maximum thickness A of the lens bearing part 22, the stability of the air gap between the two lenses can be ensured, the risk of displacement or inclination of the middle lens 3 is reduced, the optical distortion or image quality caused by assembly error is reduced, and the high resolution and clarity of the optical lens are ensured.

[0036] Specifically, the size tolerance of the maximum thickness B of the lens barrel bearing part 21 along the direction of the optical axis is within ±10um. By controlling the size tolerance of the maximum thickness B of the lens barrel bearing part 21, the stability of the air gap between the two lenses can be ensured, the risk of assembly deviation of the two parts is reduced, and the stable bearing with the lens barrel 1 can be ensured, the radial inclination and shaking are avoided, and the middle lens 3 can also be kept stable in the radial direction.

[0037] As shown in the figure, Figure 1 The radius R1 of the bearing spacer 2 and the radius R2 of the middle lens 3 satisfy: R1 / R2>1.2. By controlling the radius ratio of the bearing spacer 2 and the middle lens 3, the stable bearing between the middle lens 3 and the bearing spacer 2 is ensured, and the displacement of the middle lens 3 caused by insufficient bearing area is avoided. At the same time, the middle lens 3 can be smoothly assembled into the bearing spacer 2.

[0038] Optionally, the material of the bearing spacer 2 is PC plastic.

[0039] Optionally, the material of the fixed pressing ring 4 is PC plastic.

[0040] Optionally, the material of the middle lens 3 is glass.

[0041] By selecting appropriate materials, the stable connection between the abutting spacer ring 2, the fixed pressing ring 4 and the middle lens 3 is ensured, the stability and reliability of the optical lens assembly are improved, the displacement and deformation of the lens that may occur in the use process are reduced, and the stability of the optical performance is ensured. At the same time, the durability and processability of the material are also ensured.

[0042] As shown in Figure 2 The image side of the middle lens 3 includes an abutting annular surface 31 and a let-in annular surface 32, the abutting annular surface 31 extends along the direction perpendicular to the optical axis of the optical lens, and the fixed pressing ring 4 abuts against the abutting annular surface 31; the let-in annular surface 32 is located on the image side of the abutting annular surface 31 and is close to the optical axis relative to the outer annular surface of the middle lens 3, and the let-in annular surface 32 is spaced apart from the fixed pressing ring 4. Such a structural design makes the structural part of the middle lens 3 let in the fixed pressing ring 4 in the radial direction through the let-in annular surface 32, and let in the axial direction through the abutting annular surface 31, avoiding that the fixed pressing ring 4 blocks the imaging light, and is also beneficial to realize miniaturization design.

[0043] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects:

[0044] 1. By introducing the abutting spacer ring 2, the middle lens 3 with a small outer diameter is abutted on the inner annular surface of the abutting spacer ring 2, and the fixed pressing ring 4 is abutted on the image side of the middle lens 3 for fixation, so that the middle lens 3 realizes abutting against the lens barrel 1 by relying on the abutting spacer ring 2, and the radial limiting is ensured.

[0045] 2. The abutting spacer ring 2 includes a lens abutting part 22 and a lens barrel abutting part 21, the lens barrel abutting part 21 can realize stable abutting of the abutting spacer ring 2 and the lens barrel 1, and the object side of the lens barrel abutting part 21 extends out of the lens abutting part 22 towards the optical axis, so that the object side of the middle lens 3 is abutted on the lens abutting part 22, and the middle lens 3 is limited on the image side by the fixed pressing ring 4, and the middle lens 3 has high stability in the radial direction and the axial direction.

[0046] 3. Stable abutting is maintained by providing limiting and supporting in the axial direction by the fixed pressing ring 4, the assembly stability of the optical lens is enhanced, the performance, yield and reliability of the optical lens are improved, and the imaging quality of the optical lens is ensured to be stable.

[0047] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the utility model.

[0048] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components and / or combinations thereof, but do not preclude the presence or addition of one or more other features, steps, operations, devices, components and / or combinations thereof.

[0049] It should be noted that the terms "first", "second", and the like, herein do not necessarily have an either chronological or spatial relation to each other, but are used merely to distinguish a different single implementation from another unless specifically indicated otherwise. It should be understood that the use of the term "or" in the context of describing example embodiments is used to mean a selection of one or more of the alternatives. For example, the phrase "A / B or C" is satisfied by any one of the following alternatives: [A and B] or [C].

[0050] The preferred embodiments of the present application have been described above with the specific embodiments. The present application is not limited to the above embodiments. It will be appreciated by those skilled in the art that changes can be made to the embodiments described herein, without departing from the spirit and scope of the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. An optical lens characterized in that, The optical lens comprises: a lens group, from an object side to an image side of the optical lens, the lens group comprising at least an object end lens, a middle lens (3) and an image end lens, the object end lens being the closest lens to the object side in the optical lens, the image end lens being the closest lens to the image side in the optical lens; a bearing spacer (2), an outer annular surface of the middle lens (3) bearing on an inner annular surface of the bearing spacer (2); a fixed pressure ring (4), the fixed pressure ring (4) at least partially bearing on an image side surface of the middle lens (3), the fixed pressure ring (4) being connected with the bearing spacer (2) through an adhesive part (5); a lens barrel (1), the bearing spacer (2), the lens group and the fixed pressure ring (4) being accommodated in the lens barrel (1), an outer annular surface of the bearing spacer (2) bearing on an inner wall surface of the lens barrel (1).

2. The optical lens of claim 1, wherein, A bearing length C of the outer annular surface of the fixed pressure ring (4) and the inner annular surface of the bearing spacer (2) along the direction of the optical axis of the optical lens satisfies: C>0.1mm.

3. The optical lens of claim 1, wherein, A maximum height H of the adhesive part (5) bonding the image side surface of the fixed pressure ring (4) and the inner annular surface of the bearing spacer (2) along the direction of the optical axis of the optical lens satisfies: H>0.05mm.

4. The optical lens of claim 1, wherein, A maximum width L of the adhesive part (5) bonding the image side surface of the fixed pressure ring (4) and the inner annular surface of the bearing spacer (2) along the direction perpendicular to the optical axis of the optical lens satisfies: L>0.15mm.

5. The optical lens of claim 1, wherein, The bearing spacer (2) comprises: a lens barrel bearing part (21), the lens barrel bearing part (21) having the outer annular surface of the bearing spacer (2); a lens bearing part (22), the lens bearing part (22) extending from an object side end of the lens barrel bearing part (21) to the direction close to the optical axis of the optical lens, an object side surface of the middle lens (3) bearing on an image side of the lens bearing part (22).

6. The optical lens of claim 5, wherein, A maximum thickness A of the lens bearing part (22) along the direction of the optical axis satisfies: A>0.1mm.

7. The optical lens according to claim 5, wherein a dimensional tolerance of the maximum thickness A of the lens bearing part (22) along the direction of the optical axis is within ±10um; and / or a dimensional tolerance of the maximum thickness B of the lens barrel bearing part (21) along the direction of the optical axis is within ±10um.

8. The optical lens of any of claims 1 to 7, wherein, A ratio R1 / R2 between a radius R1 of the bearing spacer (2) and a radius R2 of the middle lens (3) satisfies: R1 / R2>1.

2.

9. The optical lens according to any one of claims 1 to 7, wherein a material of the bearing spacer (2) is PC plastic; and / or a material of the fixed pressure ring (4) is PC plastic; and / or a material of the middle lens (3) is glass; and / or a material of the adhesive part (5) is one of water-based glue, ultraviolet light curing glue or heat curing glue.

10. The optical lens of any of claims 1 to 7, wherein, An image side surface of the middle lens (3) comprises: A bearing annular surface (31) extending in a direction perpendicular to an optical axis of the optical lens, the fixed pressing ring (4) bearing against the bearing annular surface (31); A yielding annular surface (32) located on an image side of the bearing annular surface (31) and close to the optical axis relative to an outer annular surface of the intermediate lens (3), the yielding annular surface (32) being spaced apart from the fixed pressing ring (4).

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