TWI779233B - Lens mount, optical element, and lens module - Google Patents

Abstract

A lens module includes a lens mount, at least one lens, and a positioning ring. The lens mount is cylinder-shaped and has an inner peripheral face. The inner peripheral face encloses a receiving space. The lens mount has a first end and a second end along an axial direction. The inner peripheral face has a positioning section near the first end. The at least one lens is arranged in the receiving space, and the outer peripheral face of the at least one lens contacts the inner peripheral face of the lens mount. The positioning ring is arranged in the receiving space, and the outer peripheral face of the positioning ring corresponds to the positioning section to prevent the at least one lens from falling out. At least one of the positioning section and the outer peripheral face of the positioning ring includes an annular rough section. The rough section includes a plurality of grooves for injecting with an adhesive. The grooves are spacedly arranged around the axial direction. A rib is formed between any two adjacent grooves. An end of each of the grooves closer to the first end is defined as a third end, and an end closer to the second end is defined as a fourth end. A width of each of the grooves is increasing from the fourth end toward the third end so that an angle between two lateral walls of the groove is larger than 0 degree but smaller than 90 degrees.

Description

Lens Mounts, Optical Components and Lens Modules

The invention relates to a lens holder, an optical element and a lens module.

Generally speaking, a lens module is composed of a lens mount and a lens. The inner ring surface of the lens mount usually has a plurality of levels for a plurality of lenses to respectively abut and position in sequence, so that the distance between the lenses is accurate, and the lens mount The end of the larger inner diameter is usually fixed to the inner ring surface of the lens holder with a pressure ring, which not only prevents the lens from falling out, but also further ensures the precise position of each lens and provides protection.

In addition to positioning the pressure ring with a tight fit or snap-fit structure, there are also axially extending grooves formed at the corresponding positions on the inner ring surface of the lens holder, and adhesives are injected into the grooves to fix the pressure ring, as described in the patent TW I616698 .

However, the above-mentioned structure faces a dilemma: in order to maintain a larger contact area between the lens holder and the pressure ring, the grooves should not be too many, or the width of the grooves should not be too wide, while the narrower grooves cause This solves the problem that the adhesive is difficult to inject, and the groove runs through the axial direction, so the adhesive may overflow to the lens, causing lens contamination.

On the other hand, although optical components such as spacer rings or pressure rings in the lens module do not directly participate in imaging, they are indispensable components for fixing the position of the lens. However, when light hits these optical components, noise will be formed. Astigmatism may affect image quality.

In order to prevent stray light from affecting imaging, uneven structures are usually used to disperse stray light to avoid concentration of stray light, such as shown in patents TW I612354, TW I616697, and TW I639029, usually around the optical part of the lens or between the spacer rings A fine concave-convex structure is formed on the inner ring surface and the like.

However, the shape of the conventional concave-convex structure is extremely uniform, such as concentric circular grooves, radial radial linear grooves, etc., the direction of the reflective surface formed is consistent, and there is even the possibility of concentrating stray light, which is very effective in eliminating stray light It needs to be strengthened.

The main purpose of the present invention is to provide a lens holder, an optical element and a lens module, which have a special concave-convex structure, which is easy to fill with adhesive or can be used to eliminate stray light.

In order to achieve the above object, the present invention provides a lens holder, which is cylindrical and has an inner ring surface, and the inner ring surface encloses an accommodating space for accommodating at least one optical element. The two axial ends of the lens holder are respectively a first One end and a second end, the inner ring surface near the first end contains an annular concave-convex section, the concave-convex section is provided with a plurality of concave grooves, and these concave grooves are arranged at intervals around the axial direction of the lens holder , a convex rib is formed between any two of the concave grooves, the end of each of the concave grooves closer to the first end is defined as a third end, and the end of each of the concave grooves closer to the second end is defined as a fourth end, The width of each of the concave grooves along the circumferential direction gradually expands from the fourth end to the third end, so that the two side walls of each of the concave grooves form a first angle, and the first angle is greater than 0 degrees and less than 90 degrees.

In order to achieve the above object, the present invention further provides an optical element, which is annular and has an inner ring surface. The inner ring surface is formed with a concave-convex section, and the concave-convex section is provided with a plurality of concave grooves. These concave grooves surround the optical One of the elements is arranged at intervals in the axial direction, and a convex rib is formed between any two of the grooves. The two ends of each groove along the axial direction are respectively a fifth end and a sixth end. The width of each groove along the circumference is Expand gradually from the sixth end to the fifth end, so that the two side walls of each groove form a third angle, and the third angle is greater than 0 degrees and less than 90 degrees.

To achieve the above object, the present invention further provides a lens module, which includes a lens mount, at least one lens and a pressure ring.

The lens holder is cylindrical and has an inner ring surface, which encloses an accommodating space. The two axial ends of the lens holder are respectively a first end and a second end. The inner ring surface is close to the second end. One end contains a sealing section; the at least one lens is arranged in the accommodating space and its outer ring surface is in contact with the inner ring surface of the lens seat; the pressure ring is arranged in the accommodating space and its outer ring surface Corresponding to the sealing section of the lens holder to prevent the at least one lens from falling out from the first end of the lens holder; wherein, at least one of the sealing section and the outer ring surface of the pressure ring includes a ring-shaped Concave-convex section, the concave-convex section is provided with a plurality of concave grooves for injecting an adhesive, these concave grooves are arranged at intervals around the axial direction of the lens holder, a convex rib is formed between any two of the concave grooves, each of the concave grooves is relatively The end close to the first end is defined as a third end, the end of each groove closer to the second end is defined as a fourth end, and the width of each groove along the circumferential direction is from the fourth end to the third end Gradual expansion, so that the two side walls of each groove form a first angle, and the first angle is greater than 0 degrees and less than 90 degrees.

The following examples illustrate possible implementations of the present invention, but are not intended to limit the scope of protection of the present invention.

Please refer to FIG. 1 to FIG. 10 , the present invention provides a lens holder 10, which is cylindrical and has an inner ring surface, and the inner ring surface encloses an accommodating space to accommodate at least one optical element. The ends are respectively a first end 11 and a second end 12. The inner ring surface near the first end 11 contains an annular concave-convex section 13. The concave-convex section 13 is provided with a plurality of concave grooves 131. These The concave grooves 131 are arranged at intervals around the axial direction of the lens holder 10, and a convex rib 132 is formed between any two of the concave grooves 131. Preferably, the surface of each convex rib 132 is parallel to the axial direction; each of the concave grooves 131 The end closer to the first end 11 is defined as a third end 1311, and the end of each of the grooves 131 closer to the second end 12 is defined as a fourth end 1312. The width of each of the grooves 131 along the circumferential direction is from The fourth end 1312 expands gradually toward the third end 1311, so that the two side walls of each of the grooves 131 form a first angle θ1, and the first angle θ1 is greater than 0 degrees and less than 90 degrees.

The present invention also provides an optical element (such as a pressure ring 20), which is annular and has an inner ring surface, and the inner ring surface is formed with a concave-convex section 21, and the concave-convex section 21 is provided with a plurality of concave grooves 211. The concave grooves 211 are arranged at intervals around one axial direction of the optical element, a convex rib 212 is formed between any two of the concave grooves 211, and the two ends of each concave groove 211 along the axial direction are respectively a fifth end 2111 and a first Six ends 2112, the width of each of the grooves 211 along the circumferential direction gradually expands from the sixth end 2112 to the fifth end 2111, so that the two side walls of each of the grooves 211 form a third angle θ3, the third angle θ3 Greater than 0 degrees and less than 90 degrees.

The present invention further provides a lens module, which includes a lens mount 10 , at least one lens 30 and a pressure ring 20 .

The lens holder 10 is cylindrical and has an inner ring surface, which encloses an accommodating space. The two axial ends of the lens holder 10 are respectively a first end 11 and a second end 12. The inner ring The surface close to the first end 11 contains a sealing section; the at least one lens 30 is arranged in the accommodating space and its outer ring surface is in contact with the inner ring surface of the lens holder 10; the pressure ring 20 is arranged in the accommodating space Placed in the space and its outer ring faces the sealing section of the lens holder 10 to prevent the at least one lens 30 from falling out from the first end 11 of the lens holder 10; wherein, the sealing section is outside the pressure ring 20 At least one of the annular surfaces includes an annular concave-convex section 13, the concave-convex section 13 is provided with a plurality of concave grooves 131 for injecting an adhesive 40, and these concave grooves 131 are spaced around the axial direction of the lens holder 10 Set, a convex rib 132 is formed between any two of the concave grooves 131, preferably, the surface of each of the convex ribs 132 is parallel to the axial direction; one end of each of the concave grooves 131 closer to the first end 11 is defined as a The third end 1311, the end of each of the concave grooves 131 closer to the second end 12 is defined as a fourth end 1312, the width of each of the concave grooves 131 along the circumference is gradually from the fourth end 1312 to the third end 1311 Expanding, so that the two side walls of each groove 131 form a first angle θ1, and the first angle θ1 is greater than 0 degrees and less than 90 degrees.

In this embodiment, the outline of each of the concave grooves 131, 211 is an isosceles trapezoid when viewed in a radial direction (of course, the outline of each of the convex ribs 132 is also an isosceles trapezoid when viewed from the radial direction), that is to say , if the first angle θ1 (or the third angle θ3) is divided into a first sub-angle θ11 and a second sub-angle θ12 by the axial direction, the first sub-angle θ11 is the same as the second sub-angle θ12 and are respectively greater than 0 degrees and less than 45 degrees, preferably, the first angle θ1 (or the third angle θ3) is between 15 and 25 degrees; however, in other possible embodiments of the present invention, each of the concave The outline of the groove when viewed from the radial direction is non-isosceles trapezoidal, in other words, the first sub-angle is not equal to the second sub-angle; in addition, the maximum width of each of the concave grooves 131, 211 along the circumferential direction It is 8 to 12 times of the minimum width, that is to say, the width of each of the grooves 131, 211 at the third end 1311 (or the fifth end 2111) is approximately at the fourth end 1312 (or the sixth end 2111). 8 to 12 times the width at end 2112).

In addition, the bottom surface 1313 of each of the concave grooves 131 is inclined relative to the axial direction and forms a second angle θ2 with the axial direction. The second angle θ2 is greater than 0 degrees and less than 45 degrees. Preferably, the second angle θ2 is between 3 degrees and 10 degrees; more specifically, in this embodiment, the radial depth of each of the grooves 131 gradually increases from the fourth end 1312 to the third end 1311, that is, Each of the concave grooves 131 gradually approaches the central axis of the lens holder 10 from the third end 1311 toward the fourth end 1312; , the guide surface 1321 faces the first end 11 and the axial direction, which facilitates the insertion of the compression ring 20 .

In this embodiment, only the sealing section is provided with the concave-convex section 13 on the outer ring surface of the sealing section and the pressure ring 20, however, in other possible embodiments, it can be outside the pressure ring The concave-convex section is provided on the annular surface, or the concave-convex section is respectively provided on the sealing section and the outer annular surface of the pressure ring, and even, as shown in Figures 11 to 12, on the lens holder 10 Next to the original concave-convex section 13 on the inner ring surface, another concave-convex section 14 is specially used to disperse stray light, and the original concave-convex section 13 is used to connect with the pressure ring 20; in addition, as shown in Figures 13 to 16 As shown, the lens mount 10'' can have concave-convex sections 13' of different shapes, the concave groove 131' and the convex rib 132' form a wavy extension, and the bottom surface 1313' of the concave groove 131' is also inclined relative to the axial direction And there is a fourth angle θ4 with the axial direction, the fourth angle θ4 is greater than 0 degrees and less than 45 degrees, so that the radial depth of the groove 131 ′ gradually increases from the fourth end to the third end.

With the above structure, when the concave-convex section is provided on the inner ring surface of the optical element or the inner ring surface of the lens holder, since the side walls of the grooves are not parallel to the axial direction, that is to say, each groove The distance from different positions of the side wall to the optical axis is not the same, so the influence of stray light on imaging can be effectively eliminated, and the bottom surface of the groove is not parallel to the axial direction but inclined, which can further disperse and reflect stray light and avoid affect imaging; and when the concave-convex section is set between the pressure ring and the lens seat, the concave groove can be injected into the adhesive, because the opening end of the concave groove is wide and deep, which is quite conducive to the injection of the adhesive, and because the concave The inner side of the groove is narrow and shallow, which can prevent the adhesive from overflowing to the lens, and can maintain a large convex rib surface, that is, the contact area between the pressure ring and the lens mount can be increased, and the friction force can be improved. Ensure a tight fit of both for securing effect.

10, 10’, 10’’: lens mount 11: first end 12: Second end 13, 13': Concave-convex section 131, 131': concave groove 1311: the third end 1312: the fourth end 1313, 1313': bottom surface 132, 132': convex rib 1321: guide surface 14: Concave-convex section 20: pressure ring 21: concave and convex section 211: Groove 2111: fifth end 2112: sixth end 212: convex rib 30: Lens 40: Adhesive θ1: first angle θ11: first sub-angle θ12: second sub-angle θ2: second angle θ3: third angle θ4: Fourth angle

FIG. 1 is a perspective view of the lens module of the present invention. Fig. 2 is a perspective view of the lens holder and pressure ring of the present invention. Fig. 3 is a three-dimensional exploded view of the lens mount and pressure ring of the present invention. Fig. 4 is a front view of the lens module of the present invention. Fig. 5 is a sectional view of the lens module of the present invention. Fig. 6 is a sectional view of the lens holder and pressure ring of the present invention. Fig. 7 is a partial side view of the concave-convex structure of the present invention. FIG. 8 is a partially enlarged view of FIG. 6 . Fig. 9 is a partial perspective view of the concave-convex structure of the present invention. Fig. 10 is a partial perspective view of the lens holder and pressure ring of the present invention. Fig. 11 is a three-dimensional exploded view of the lens mount and pressure ring of the second embodiment of the present invention. Fig. 12 is a sectional view of the second embodiment of the present invention. Fig. 13 is a three-dimensional exploded view of the lens mount and pressure ring of the third embodiment of the present invention. Fig. 14 is a sectional view of the third embodiment of the present invention. Fig. 15 is a partially enlarged view of Fig. 14 . Fig. 16 is a partial perspective view of the concave-convex structure of the third embodiment of the present invention.

10: Lens holder

13: Concave-convex section

20: pressure ring

21: concave and convex section

Claims (23)

A lens holder, which is cylindrical and has an inner ring surface, the inner ring surface encloses an accommodating space to accommodate at least one optical element, the two axial ends of the lens holder are respectively a first end and a second end, The inner ring surface near the first end contains an annular concave-convex section, the concave-convex section is provided with a plurality of concave grooves, and the concave grooves are arranged at intervals around the axial direction of the lens holder, and any two of the concave grooves are arranged at intervals. A convex rib is formed, the end of each of the grooves closer to the first end is defined as a third end, the end of each of the grooves closer to the second end is defined as a fourth end, and the width of each of the grooves along the circumferential direction Expand gradually from the fourth end to the third end. The lens mount according to Claim 1, wherein the outline of each of the grooves viewed from a radial direction is an isosceles trapezoid. The lens mount according to claim 1, wherein the outline of each of the grooves viewed from a radial direction is non-isosceles trapezoidal. The lens mount according to claim 1, wherein the bottom surface of each of the grooves is inclined relative to the axial direction and forms a second angle with the axial direction, and the second angle is greater than 0 degrees and less than 45 degrees. The lens mount according to claim 4, wherein the second angle is between 3 degrees and 10 degrees. The lens mount as claimed in claim 1, wherein the radial depth of each of the concave grooves gradually increases from the fourth end to the third end. The lens holder according to claim 1, wherein an end of each of the convex ribs close to the first end forms an inclined guide surface, and the guide surface faces the first end and the axial direction. The lens mount according to claim 1, wherein the two side walls of each groove form a first angle, and the first angle is greater than 0 degrees and less than 90 degrees. The lens mount according to claim 8, wherein the first angle is between 15 and 25 degrees. An optical element, which is annular and has an inner ring surface, the inner ring surface is formed with a concave-convex section, and the concave-convex section is provided with a plurality of concave grooves, and the concave grooves are arranged at intervals around one axial direction of the optical element, A convex rib is formed between any two of the concave grooves, the two ends of each of the concave grooves along the axial direction are respectively a fifth end and a sixth end, and the width of each of the concave grooves along the circumference is from the sixth end to the sixth end The five ends gradually expand. The optical element according to claim 10, wherein the outline of each of the grooves viewed from a radial direction is an isosceles trapezoid. The optical element according to claim 10, wherein the outline of each of the grooves viewed from a radial direction is non-isosceles trapezoidal. The optical element according to claim 10, wherein the two side walls of each groove form a third angle, and the third angle is greater than 0 degrees and less than 90 degrees. The optical element as claimed in claim 13, wherein the third angle is between 15 and 25 degrees. A lens module, comprising: a lens holder, which is cylindrical and has an inner ring surface, the inner ring surface encloses an accommodating space, and the axial ends of the lens holder are respectively a first end and a second end , the inner annular surface includes a sealing section near the first end; at least one lens is arranged in the accommodating space and its outer annular surface is in contact with the inner annular surface of the lens holder; a pressure ring is arranged on the The sealing section in the accommodation space and whose outer ring faces the corresponding lens holder; wherein, at least one of the sealing section and the outer ring surface of the pressure ring includes an annular concave-convex section, and the concave-convex area The section is provided with a plurality of grooves for injecting an adhesive, and these grooves are arranged at intervals around the axial direction of the lens holder, a convex rib is formed between any two of the grooves, and one end of each groove is closer to the first end Defined as a third end, the end of each of the grooves closer to the second end is defined as a fourth end, and the width of each of the grooves along the circumferential direction gradually expands from the fourth end to the third end. The lens module according to claim 15, wherein the outline of each of the grooves viewed from a radial direction is an isosceles trapezoid. The lens module according to claim 15, wherein the outline of each of the grooves viewed from a radial direction is non-isosceles trapezoidal. The lens module according to claim 15, wherein the bottom surface of each of the grooves is inclined relative to the axial direction and forms a second angle with the axial direction, and the second angle is greater than 0 degrees and less than 45 degrees. The lens module according to claim 18, wherein the second angle is between 3 degrees and 10 degrees. The lens module as claimed in claim 15, wherein the radial depth of each of the grooves gradually increases from the fourth end to the third end. The lens module according to claim 15, wherein an end of each of the convex ribs close to the first end forms an inclined guide surface, and the guide surface faces the first end and the axial direction. The lens module according to claim 15, wherein the two side walls of each groove form a first angle, and the first angle is greater than 0 degrees and less than 90 degrees. The lens module as claimed in claim 22, wherein the first angle is between 15 and 25 degrees.

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