TWI416190B - Spacer ring and lens module having the same - Google Patents

Abstract

This invention relates to a spacer ring. The spacer ring is configured for spacing two adjacent lenses in a lens module. The spacer ring includes a spacing portion, a clipping portion and a shadowing portion. The spacing portion, the clipping portion and the shadowing portion are all annular-shaped. The spacing portion is far from the axis of the spacer ring, and is configured for separating two adjacent lenses. The shadowing portion is close to the axis of the spacer ring, and is adapted for blocking light. The clipping portion is between the spacing portion and the shadowing portion, and is adapted for clipping two adjacent lenses. This invention also provides a lens module including the above-mentioned spacer ring.

Description

Spacer ring and lens module having the same

The present invention relates to the field of imaging technology, and in particular, to a spacer ring and a lens module having the spacer ring.

In recent years, with the development of multimedia technology, the application range of lens modules has become wider and wider. For example, it is used in portable electronic products such as digital cameras, video cameras, and mobile phones with camera functions. While people are pursuing miniaturization of digital cameras, camcorders, and mobile phones with camera functions, there is a higher demand for the quality of the images they shoot, that is, the image of the subject is more clear.

The image quality of the subject is largely determined by the alignment of the optical axes of the lenses in the lens module. Alpheus W. Burner et al., Paper Lens Calibration For Wind Tunnel Measurements, presented at the 1995 SPIE System, Videometrics IV, explains that the optical axes of the lenses are different for the optical properties of the lens module. The impact.

Referring to FIG. 3 , the lens module 30 of the prior art includes a lens barrel 31 and a plurality of lenses 32 disposed in the lens barrel 31 . The plurality of lenses 32 are generally spaced by a spacer ring 33 such that the plurality of lenses 32 have a suitable spacing to cooperate with imaging. However, the lens module 30 of the prior art has the following disadvantages: First, when the plurality of lenses 32 and the spacer ring 33 are sequentially assembled into the lens barrel 31, there is no matching structure between the lens 32 and the spacer ring 33, which may cause the lens 32 to There is an assembly error between the spacer rings 33, thereby making The optical axis concentricity of each lens 32 is not high, which affects the imaging quality of the lens module 30. Secondly, the spacer ring 33 generally cannot block light, and may cause a part of the stray light to enter the lens module 30 through the spacer ring 33. The image sensor may reduce the imaging resolution of the lens module 30, that is, reduce the imaging quality of the lens module 30.

In view of this, it is necessary to provide a spacer ring and a lens module which can have a high image quality.

A spacer ring and a lens module will be described below by way of embodiments.

A spacer ring for two adjacent lenses in a lens module. The spacer ring includes a spacer portion, an engaging portion, and a light blocking portion. The spacer portion, the engaging portion, and the light shielding portion are both annular, and are connected in order from the axis of the spacer ring toward the direction of the spacing ring axis green. The spacer is configured to separate two adjacent lenses, and the engaging portion is configured to be engaged with two adjacent lenses for blocking light.

A lens module includes a lens barrel, a first lens, a second lens, and a spacer ring. The first lens, the spacer ring and the second lens are sequentially disposed in the lens barrel along the optical axis direction, and the first lens includes the first optical And a first fixing portion, the second lens includes a second optical portion and a second fixing portion, wherein the first fixing portion has a first engaging structure, and the second fixing portion has a second engaging structure, the spacing The ring includes a spacer portion, an engaging portion, and a light shielding portion. The spacer portion, the engaging portion, and the light shielding portion are both annular, and are sequentially connected from a direction away from the spacer ring axis toward the axis of the spacer ring, the spacer portion and the first fixing portion. And contacting the second fixing portion to separate the first lens and the second lens, the engaging portion cooperates with the first engaging structure and the second engaging structure to engage The first lens and the second lens are configured to block light from entering the lens module from the first fixing portion and the second fixing portion.

The spacer ring and the lens module in the technical solution have the following advantages: First, the spacer ring has a locking portion, which can be engaged with each lens in the lens module to ensure the optical axis of each lens in the lens module is concentric Degree, that is, the optical axes of the lenses are aligned; secondly, the spacer ring also has a light shielding portion, which can also function as a light shielding film while spacing adjacent lenses, thereby blocking non-imaging light from entering the image, thereby improving the lens The imaging quality of the module.

The spacer ring and the lens module provided by the technical solution are further described in detail below with reference to the accompanying drawings and the embodiments.

Referring to FIG. 1 , a lens module 10 according to a first embodiment of the present invention includes a lens barrel 11 , a first lens 12 , a second lens 13 , and a first spacer ring 14 . The first lens 12 and the first spacer ring 14 . The second lens 13 is sequentially disposed in the lens barrel 11 along the optical axis direction of the lens module 10.

The lens barrel 11 is a cylindrical body and is enclosed by a side wall 111. The middle of the lens barrel 11 has a receiving cavity 110 for receiving the first lens 12, the second lens 13, and the first spacer ring 14. A front cover 112 is connected to one end of the side wall 111. The front cover body 112 has a truncated-shaped through hole 1120 in the middle. The through hole 1120 is in communication with the accommodating cavity 110 for controlling the incident angle of the light entering the accommodating cavity 110 and the luminous flux.

The first lens 12 is disposed in the receiving cavity 110 of the lens barrel 11 and optically coupled to the second lens 13 . The first lens 12 has a first optical portion 121 and a first fixing portion 122. The first optical portion 121 is configured to light an object Learn to image. The first fixing portion 122 is connected around the first optical portion 121 for fixing the first optical portion 121. The first fixing portion 122 has a first fixing surface 1221 and a second fixing surface 1222 opposite to each other. The first fixing surface 1221 and the second fixing surface 1222 are both perpendicular to the optical axis of the first lens 12. Further, the first fixing surface 1221 is a surface close to the object side of the lens module 10, and is in contact with the front cover 112 of the lens barrel 11. The second fixing surface 1222 is close to the image side of the lens module 10 and is in contact with the first spacer ring 14 .

The first lens 12 has a first engaging structure to be engageable with the first spacer ring 14. The first engaging structure may be a protrusion or a groove or other structure. In this embodiment, the first fixing portion 122 has a first annular protrusion 123 in a region close to the first optical portion 121 , and the first protrusion 123 extends from the second fixing surface 1222 of the first fixing portion 122 to the first spacing ring. 14. The second lens 13 protrudes in the direction. The first protrusion 123 has a first side surface 1231 away from the optical axis, a second side surface 1232 adjacent to the optical axis, and a third side surface 1233 connecting the first side surface 1231 and the second side surface 1232. The first side surface 1231 is connected to the second fixing surface 1222 of the first fixing portion 122 and has an obtuse angle with the second fixing surface 1222. The shape of the second side surface 1232 and its connection angle with the third side surface 1233 are not limited, and are preferably symmetrical with the first side surface 1231. The third side surface 1233 is parallel to the second fixing surface 1222 of the first fixing portion 122 , that is, the angle between the third side surface 1233 and the first side surface 1231 is the same as the angle between the first side surface 1231 and the first fixing surface 1221.

Of course, the angle between the first side surface 1231 and the first fixing surface 1221, and the angle between the first side surface 1231 and the third side surface 1233 may be a right angle or an acute angle.

The second lens 13 also includes a second optical portion 131 and a second fixing portion 132. The second fixing portion 132 has a third fixing surface 1321 that is in contact with the first spacer ring 14 and a third surface opposite to the third fixing surface 1321. Four fixed faces 1322. The second lens 13 has a second engaging structure to be assembled with the first spacer ring 14. The second engaging structure may be a protrusion or a groove or other structure. In this embodiment, the second optical portion 131 of the second lens 13 and the second fixing portion 132 have a second annular protrusion 133 at the junction of the second optical portion 131, and the second protrusion 133 is fixed from the second fixing portion 132. The surface 1321 protrudes in the direction of the first spacer ring 14 and the first lens 12. The second protrusion 133 also has a first side surface 1331 away from the optical axis, a second side surface 1332 adjacent to the optical axis, and a third side surface 1333 connecting the first side surface 1331 and the second side surface 1332. Moreover, the first side surface 1331 is connected to the third fixing surface 1321 of the second fixing portion 132, and the angle between the first side surface 1331 and the third fixing surface 1321 is an obtuse angle. The second side surface 1332 is symmetrical to the first side surface 1331. The third side surface 1333 is parallel to the third fixing surface 1321 of the second fixing portion 132.

In addition, the fourth fixing surface 1322 of the second lens 13 may also have a protrusion to be matched with other optical components.

The first spacer ring 14 is an annular body and is interposed between the first fixing portion 122 of the first lens 12 and the second fixing portion 132 of the second lens 13 . The first spacer ring 14 includes a spacer portion 141 , an engaging portion 142 , and a light blocking portion 143 . The spacer portion 141 , the engaging portion 142 , and the light shielding portion 143 are closer to the first spacer ring 14 from the axial direction away from the first spacer ring 14 . The axial directions are connected in order.

The spacer 141 is annular and has a first surface 1411 opposite to the first surface The second surface 1412 is in contact with the second fixing surface 1222 of the first lens 12, and the second surface 1412 is in contact with the third fixing surface 1321 of the second lens 13, so that the spacing portion 141 can be spaced apart from the first surface. The lens 12 and the second lens 13 have a suitable spacing between the first lens 12 and the second lens 13 for easy co-engagement imaging.

In this embodiment, the engaging portion 142 has a structure that cooperates with the first protrusion 123 and the second protrusion 133, so that the engaging portion 142 can be engaged with the first lens 12 and the second lens 13. Specifically, the engaging portion 142 is also annular, and has a third surface 1421 and a fourth surface 1422 opposite to each other. The third surface 1421 is connected to the first surface 1411 of the partition portion 141 , and the angle between the third surface 1421 and the first surface 1411 corresponds to an angle between the first side surface 1231 and the third side surface 1233 of the first protrusion 123 . The fourth surface 1422 is connected to the second surface 1412 of the spacer 142 , and the angle between the fourth surface 1422 and the second surface 1412 corresponds to an angle between the first side 1331 and the third side 1333 of the second protrusion 133 . Thus, the third surface 1421 can be mated with the first side surface 1231 of the first protrusion 123, and the fourth surface 1422 can be mated with the first side surface 1331 of the second protrusion 133. That is, the engaging portion 142 can be engaged with the first engaging structure of the first lens 12 and the second engaging structure of the second lens 13 to realize the first lens 12, the second lens 13, and the first spacer ring. 14 are aligned with each other.

In addition, when the first engaging structure of the first lens 12 and the second engaging structure of the second lens 13 are grooves, the engaging portions 142 may also have structures corresponding thereto.

The light shielding portion 143 is configured to block stray light from entering the imaging area of the lens module 10 Domain to improve the imaging quality of the lens module 10. Since the light is likely to be incident on the portion closer to the axis of the lens barrel 11 and is less likely to be incident on the portion farther from the axis of the lens barrel 11, the light shielding portion 143 is the self-engaging portion 142 in this embodiment. The annular structure extending in the axial direction of the lens module 10 has an inner diameter substantially equal to the diameter of the first optical portion 121 or the diameter of the second optical portion 131. Therefore, the light shielding portion 143 blocks the stray light and does not affect the imaging light entering the imaging region of the lens module 10.

The light shielding portion 143 may be made of a light absorbing material, and the light absorbing material may be black polyethylene terephthalate (PET), black carbon polycarbonate (PC), or the like. In this embodiment, the light shielding portion 143 has a fifth surface 1431 and a sixth surface 1432 opposite to each other. The fifth surface 1431 is coupled to the third surface 1421 and is in contact with the third side 1233 of the first protrusion 123. The sixth surface 1432 is coupled to the fourth surface 1422 and is in contact with the third side 1333 of the second protrusion 133.

Of course, the fifth surface 1431 may not be in contact with the first protrusion 123, and the sixth surface 1432 may not be in contact with the second protrusion 133. In addition, the light shielding portion 143 may be configured to cooperate with the second side surface 1232 of the first protrusion 123 and the second side surface 1332 of the second protrusion 133.

In addition, the material of the spacer portion 141 and the engaging portion 142 is not limited, and may be a light absorbing material or a general transparent plastic.

As described above, in the present embodiment, the thickness of the spacer portion 141 is a constant value, which is referred to as a first thickness; the thickness of the light shielding portion 143 is also a constant value, which is recorded as a second thickness, and the first thickness is greater than the second thickness, for example, A thickness may be 1.5 to 3 times the second thickness; the thickness of the engaging portion 142 is a variable value, and is from the first A thickness is gradually changed to a second thickness; thus, the spacer portion 141, the engaging portion 142, and the light shielding portion 143 can form a first spacer ring 14 having a stepped variation in thickness, and can be formed with the first lens 12 and the second lens 13 Buckle fit.

The assembly of the lens module 10 can be performed by the following two methods. The first method is to first fix the first lens 12 in the receiving cavity 110 of the lens barrel 11; secondly, the first spacer ring 14 is assembled into the lens barrel 11 and make the first surface 1411 and the second lens 12 second. The fixing surface 1222 is in contact, the third surface 1421 is in contact with the first side surface 1231 of the first protrusion 123, and the fifth surface 1431 is in contact with the third side surface 1233 of the first protrusion 123; the second lens 13 is again assembled into the lens barrel 11 And contacting the third fixing surface 1321 of the second lens 13 with the second surface 1412 of the first spacer ring 14, the first side surface 1331 of the second protrusion 133 is in contact with the fourth surface 1422, and the second protrusion 133 is The third side 1333 is in contact with the sixth surface 1432 to complete the assembly of the lens module 10. The second method is to first fit the first spacer ring 14 to the first lens 12, and secondly to assemble the second lens 13 to the first spacer ring 14 to form a lens group, and then assemble the lens group into the lens barrel 11 again. In the receiving cavity 110, the assembly of the lens module 10 is completed.

During the assembly process, since the first lens 12, the first spacer ring 14, and the second lens 13 have a structure of being engaged with each other, the optical axes of the first lens 12 and the second lens 13 are easily aligned and overlapped. Moreover, since the first spacer ring 14 has the light shielding portion 143, the stray light can be blocked from entering the imaging area of the lens module 10, thereby improving the imaging quality of the lens module 10.

Referring to FIG. 2, the lens module 20 shown in the second embodiment of the present invention is substantially the same as the lens module 10 shown in the first embodiment, and the difference is the same. The lens module 20 further includes a second spacer ring 25, a third lens 26, a third spacer ring 27, and a fourth lens 28 which are sequentially disposed. The first lens 22, the second lens 23, the third lens 26, and the fourth lens 28 are sequentially disposed along the optical axis direction, and the second spacer ring 25 is disposed between the second lens 23 and the third lens 26, and the third spacer ring 27 is disposed between the third lens 26 and the fourth lens 28. The structures of the second spacer ring 25 and the third spacer ring 27 are substantially the same as those of the first spacer ring 24. The structure of the third lens 26 is also substantially the same as the structure of the second lens 23. The fourth lens 28 is an aspherical lens, and in the engaging structure of the third spacer ring 27, the angle between the first side surface 2831 and the third side surface 2833 is a right angle.

In this embodiment, since the first lens 22, the first spacer ring 24, the second lens 23, the second spacer ring 25, the third lens 26, the third spacer ring 27, and the fourth lens 28 are engaged with each other, only The diameters of the second lens 13 and the third spacer ring 27 are matched with the inner diameter of the lens barrel 21, that is, the diameters of the second lens 13 and the third spacer ring 27 are equal to the inner diameter of the lens barrel 21, and the first lens 22 is The diameters of the first spacer ring 24, the second spacer ring 25, the third lens 26, and the fourth lens 28 may be slightly smaller than the inner diameter of the lens barrel 21.

Of course, among the first lens 22, the first spacer ring 24, the second lens 23, the second spacer ring 25, the third lens 26, the third spacer ring 27, and the fourth lens 28, other lenses, other spacer rings, and a lens barrel The inner diameter of 21 may be matched. For example, the first spacer ring 24 and the third lens 26 are equal to the inner diameter of the lens barrel 21; of course, all of the lens and the spacer ring may cooperate with the inner diameter of the lens barrel 21.

The spacer ring and the lens module in the technical solution have the following advantages: First, the spacer ring has a latching portion that can be engaged with other lenses in the lens module to ensure the concentricity of the lens module, that is, to align the optical axes of the other lenses. Second, the spacer ring also has a light shielding portion. The utility model can also function as a light shielding film while having adjacent lenses, so as to block non-imaging light from entering the image and improving the imaging quality of the lens module.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

Lens module ‧‧10,20

Mirror ‧‧11,21

First lens ‧‧12,22

Second lens ‧‧‧13, 23

First spacer ring ‧‧14,24

Side wall ‧ ‧ 111

Containment chamber ‧‧110

Front cover ‧‧112

Through hole ‧‧1120

First Optics Department ‧‧121

First fixed section ‧‧122

First fixed surface ‧‧1221

Second fixed surface ‧‧12222

First raised ‧‧‧123

First side ‧‧1231, 1331, 2831

Second side ‧‧1232,1332

Third side ‧‧‧23,1333,2833

Second Optics Department ‧‧‧131

Second fixed section ‧‧‧132

Third fixed surface ‧‧‧1321.

Fourth fixed surface ‧‧1 132

Second raised ‧‧‧133

Interval ‧‧‧141

KLA ‧ ‧ 142

Shading Department ‧‧143

First surface ‧‧1411

Second surface ‧‧1412

Third surface ‧‧14221

Fourth surface ‧‧1422

Fifth surface ‧‧‧1431

Sixth surface ‧‧‧1432

Second spacer ring ‧‧25

Third lens ‧‧26

Third spacer ring ‧‧27

Fourth lens ‧‧28

FIG. 1 is a schematic diagram of a lens module according to a first embodiment of the present technical solution.

FIG. 2 is a schematic diagram of a lens module according to a second embodiment of the present technical solution.

Figure 3 is a schematic illustration of a prior art lens module.

Lens module ‧‧20

Mirror ‧‧21

First lens ‧‧22

Second lens ‧‧23

First spacer ring ‧‧24

Second spacer ring ‧‧25

Third lens ‧‧26

Third spacer ring ‧‧27

Fourth lens ‧‧28

First side ‧‧‧2831

Third side ‧‧2,833

Claims (12)

A spacer ring for use in two adjacent lenses in the lens module, wherein the spacer ring comprises a spacer portion, an engaging portion and a light shielding portion, wherein the spacer portion, the engaging portion and the light shielding portion are both annular, and Connected from the axis of the spacer ring in the direction of the axis of the spacer ring, the spacer portion is used for separating two adjacent lenses, and the engaging portion is for engaging with two adjacent lenses for blocking light. The spacer ring of claim 1, wherein the light shielding portion is made of a black light absorbing material. A lens module includes a lens barrel, a first lens, a second lens, and a spacer ring. The first lens, the spacer ring and the second lens are sequentially disposed in the lens barrel along the optical axis direction, and the first lens includes the first lens. An optical portion and a first fixing portion, the second lens includes a second optical portion and a second fixing portion, wherein the first fixing portion has a first engaging structure, and the second fixing portion has a second engaging structure, The spacer ring includes a spacer portion, an engaging portion, and a light shielding portion. The spacer portion, the engaging portion, and the light shielding portion are both annular, and are sequentially connected from the axis of the spacer ring toward the axis of the spacer ring. The spacer portion is fixed to the first portion. And the second fixing portion contacts to partition the first lens and the second lens, the engaging portion cooperates with the first engaging structure and the second engaging structure to engage the first lens and the second lens, the shielding The portion is configured to block light from entering the lens module from the first fixing portion and the second fixing portion. The lens module of claim 3, wherein the inner diameter of the light shielding portion is equal to the diameter of the first optical portion or equal to the diameter of the second optical portion. The lens module of claim 3, wherein the first engaging structure and the second engaging structure are protrusions or grooves, and the engaging portions have a first engaging structure and a second The structure corresponding to the snap structure. The lens module of claim 3, wherein the first lens has a first protrusion protruding toward the second lens, and the second lens has a second protrusion protruding toward the first lens. The first protrusion and the second protrusion respectively have a first side away from the optical axis, a second side close to the optical axis, and a third side connecting the first side and the second side, the engaging portion and the first protrusion The first side and the first side of the second protrusion are in contact. The lens module of claim 6, wherein the angle between the first side and the third side is a right angle or an obtuse angle. The lens module of claim 6, wherein the spacer has an opposite first surface and a second surface, the first surface being in contact with the first fixing portion, the second surface and the second fixing portion Contacting, the engaging portion has a third surface connected to the first surface and a fourth surface connected to the second surface, the third surface being in contact with the first side of the first protrusion, the fourth surface and the second convex The first side is in contact. The lens module of claim 6, wherein the light shielding portion has an opposite fifth surface and a sixth surface, the fifth surface being in contact with the third side surface of the first protrusion, the sixth surface being The third side of the second protrusion is in contact. The lens module of claim 3, wherein the lens module further includes a second spacer ring, a third lens, a third spacer ring, and a fourth lens disposed in the optical axis direction, the first Lens, first spacer ring, The diameter of at least one of the second lens, the second spacer ring, the third lens, the third spacer ring and the fourth lens is equal to the inner diameter of the lens barrel. A spacer ring for use in two adjacent lenses in the lens module, wherein the spacer ring comprises a spacer portion, an engaging portion and a light shielding portion, wherein the spacer portion, the engaging portion and the light shielding portion are both annular, and Connecting from the axis of the spacer ring to the axis of the spacer ring in sequence; the spacer is for separating two adjacent lenses having a first thickness; the light shielding portion is for blocking light, and has a second thickness, the The thickness is less than the first thickness; the engaging portion is for engaging with two adjacent lenses, and the thickness thereof is changed from the first thickness to the second thickness. The lens module of claim 11, wherein the first thickness is 1.5 to 3 times the second thickness.