TWI746376B - Spacer ring and lens module - Google Patents

Abstract

A spacer ring is defined with a radial direction and an axial direction perpendicular to each other. The spacer ring includes: a first annular component having a first maximum thickness in the axial direction; and a second annular component, wherein the second and first annular components are overlapped and disposed in the radial and axial directions; a first inner edge surface of the first annular component and a second inner edge surface of the second annular component form an annular groove, an opening of the annular groove faces an axis center of the spacer ring, and the size of the opening gradually increases in a direction toward the axis center along the radial direction; and, the first annular component and the second annular component have a second maximum thickness where they overlap and dispose in the axial direction, and the first maximum thickness is greater than or equal to the second maximum thickness.

Description

Spacer ring and lens module

The present invention relates to a spacer ring, and particularly relates to a lens module with a spacer ring.

Conventional lens modules generally include at least one spacer ring, which is arranged between two optical elements to adjust the distance between the two optical elements, thereby adjusting the optical performance of the lens module, such as setting Between the two lenses to adjust the focus and so on. However, part of the incident light does not directly enter the image sensor after being refracted by optical elements, but enters the image sensor after being reflected on the surface of the spacer ring, thus forming ghost images. The existence of ghost images seriously affects the captured images. Quality.

Please refer to FIG. 1, the spacer ring 90 of the lens module 9 has an annular groove 902. When the incident light L is reflected in the lens module 9 to form stray light due to multiple reflections, the annular groove 902 can remove the stray light It reflects and consumes multiple times through its inner surface, thereby improving the image quality. The spacer ring 90 is made of a metal material, and the annular groove 90 is made by turning. However, as the camera lens module enters the high-pixel field, the turning method has poor process tolerances and poor accuracy.

Therefore, there is a need to provide a spacer ring and a lens module that can solve the aforementioned problems.

One object of the present invention is to provide a spacer ring, which can be designed as more than two ring parts of the first ring part and the second ring part.

According to the above objective, the present invention provides a spacer ring defined with a radial direction and an axial direction perpendicular to each other, the spacer ring comprising: a first annular member having a first maximum thickness in the axial direction; and A second ring member, which is connected to the The first annular component is arranged overlapping in the radial direction and the axial direction, wherein: the first annular component includes a first inner peripheral surface, and the second annular component includes a second inner peripheral surface, and the first inner peripheral surface The rim surface and the second inner rim surface form an annular groove, an opening of the annular groove faces an axis of the spacer ring, and the size of the opening gradually increases in a direction toward the axis along the radial direction; the first ring The shaped component and the second annular component have a second maximum thickness at the position where they overlap in the axial direction, and the first maximum thickness is greater than or equal to the second maximum thickness.

The present invention further provides a lens module, which sequentially includes a first lens, a spacer ring, and a second lens from the object side to the image side; wherein the spacer ring is the aforementioned spacer ring.

The spacer ring of the present invention can be designed as more than two ring parts of the first ring part and the second ring part, because the thickness of the first ring part is greater than the thickness of the first ring part and the second ring part. The thickness is superimposed, so the first ring-shaped component serves as an outer spacer ring, and the thickness of the outer spacer ring determines the distance between two adjacent lenses, which is used to control the air gap between the two adjacent lenses to improve imaging quality; and, The second ring component only serves as an internal spacer ring, and forms a V-shaped or cup-shaped cross-section ring groove structure between the second ring component and the first ring component to generate light traps to achieve the function of eliminating stray light. Furthermore, the spacer ring design of the present invention has an annular groove, which has more than two annular parts, and can be separately manufactured by injection molding with small tolerance and high precision.

1: Lens module

1’: Lens module

10: Spacer ring

100: ring groove

101: opening

102: Anti-reflective layer

103: Stray light elimination structure

11: The first ring part

110: Groove

111: The first outer edge surface

112: The first inner edge surface

113: First Surface

114: second surface

12: The second ring part

121: second outer edge surface

122: second inner edge surface

123: Third Surface

124: Fourth Surface

13: lens

14: lens

15: lens

16: shading plate

17: filter

18: imaging surface

9: Lens module

90: Spacer ring

902: ring groove

D1: The first maximum thickness

D2: The second largest thickness

I: Optical axis

L: incident light

O: axis

P: Overlap setting

T1: radial

T2: axial

ψ 11: Diameter

ψ 12: Diameter

FIG. 1 is a schematic cross-sectional view of a lens module of the prior art.

2a is a schematic cross-sectional view of a lens module according to an embodiment of the invention.

2b is a schematic cross-sectional view of a lens module according to another embodiment of the invention.

Fig. 3 is a partial three-dimensional cross-sectional schematic diagram of a combined spacer ring according to an embodiment of the present invention.

Fig. 4a is a schematic partial cross-sectional view of an assembled spacer ring according to an embodiment of the present invention.

Fig. 4b is a partial cross-sectional view of the disassembled spacer ring according to an embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view of a combined spacer ring according to an embodiment of the present invention.

Fig. 6 is a schematic partial cross-sectional view of a combined spacer ring according to another embodiment of the present invention.

Figures 7a and 7b are partial three-dimensional cross-sectional schematic diagrams of a combined spacer ring according to another embodiment of the present invention.

In order to make the above-mentioned objectives, features and characteristics of the present invention more obvious and understandable, the relevant embodiments of the present invention are described in detail as follows in conjunction with the drawings.

The present invention is described below by taking a lens module of a three-element lens group as an example. 2a, the lens module 1 includes a lens 13, a lens 14, a spacer ring 10, and a lens 15 in sequence from the object side to the image side, which are arranged along the optical axis I in sequence. In this embodiment, the lens module 1 further includes a light-shielding plate 16 and a filter 17, the light-shielding plate 16 is disposed between the lenses 14, 15 along the optical axis I, and the filter 17 ( For example, an infrared light filter) is arranged behind the lens 15 along the optical axis I. The shading plate 16 can be an aperture stop or a stop for correcting edge light, but it is not limited to the above. The light passes through the lens 13, the lens 14 and the lens 15, and passes through the filter 17, so that the light reaches an imaging surface 18. The lens 13, the lens 14, and the lens 15 may be plastic lenses.

3 and 4a, the spacer ring 10 defines a radial direction T1 and an axial direction T2 that are perpendicular to each other, and the axial direction T2 is parallel to the optical axis I. The spacer ring 10 includes a first annular component 11 and a second annular component 12, and the second annular component 12 and the first annular component are overlapped in the radial direction T1 and the axial direction T2. The material of the first ring component 11 and the second ring component 12 can be metal or plastic.

The first annular component 11 includes a first inner edge surface 112, and the second annular component 12 includes a second inner edge surface 122. Both the first inner edge surface 112 and the second inner edge surface 122 can face the spacer ring 10 The axis O. The first inner edge surface 112 and the second inner edge surface 122 form an annular groove 100. The opening 101 of the annular groove 100 faces the axis O of the spacer ring 10, and the size of the opening 101 faces the radial direction T1. Axis O The direction is getting bigger. In this embodiment, the size of the opening 101 of the annular groove 100 is gradually larger in the direction of the axis O along the radial direction T1 with the V-shaped cross section, as shown in FIG. 2a. In another embodiment, the size of the opening 101 of the annular groove 100 is gradually larger in a cup-shaped section along the radial direction T1 toward the axis O, as shown in FIG. 2b, but not limited to this.

4a, 4b and 5, the first annular component 11 has a first maximum thickness D1 in the axial direction T2 (that is, the thickness of the first annular component 11 in the axial direction T2), And the position P where the first annular component 11 and the second annular component 12 overlap in the axial direction T2 has a second maximum thickness D2 (that is, the first annular component 11 and the second annular component 12 are in the The superimposed thickness of the overlapping position P in the axial direction T2), wherein the first maximum thickness D1 is greater than or equal to the second maximum thickness D2. In this embodiment, the first ring component 11 further includes a first surface 113 and a second surface 114 opposite to each other, and the second ring component 12 further includes a third surface 123 and a fourth surface 124. The first surface 113 is closer to the third surface 123 than the second surface 114 is. The tangent directions of the first surface 113, the second surface 114, the third surface 123, and the fourth surface 124 can be perpendicular to the axial direction T2, so that the first annular component 11 and the second annular component are stacked and combined 12 is easily positioned between these lenses 14, 15. For example, the first maximum thickness D1 may be the maximum distance between the first surface 113 and the second surface 114 of the first annular component 11 along the axial direction T2, and the second maximum thickness D2 may be the The maximum distance between the second surface 114 of the first ring component 11 and the third surface 123 of the second ring component 12 along the axial direction T2. The first annular component 11 further includes a first outer edge surface 111, and the second annular component 12 further includes a second outer edge surface 121. The first outer edge surface 111 and the second outer edge surface 121 are respectively opposite to the The first inner edge surface 112 and the second inner edge surface 122, that is, the first outer edge surface 111 and the second outer edge surface 121 can both face away from the axis O of the spacer ring 10, and the first outer edge surface The diameter ψ 11 of the rim surface 111 is greater than the diameter ψ 12 of the second outer rim surface 121.

The spacer ring of the present invention can be designed as more than two ring members of the first ring member 11 and the second ring member 12, because the thickness of the first ring member 11 in the axial direction T2 is greater than that of the first ring Shaped part 11 and the second annular part 12 in the axial direction T2 superimposed thickness, so the first annular component 11 as an outer spacer ring, the thickness of the outer spacer ring determines the distance between two adjacent lenses 14, 15 to control the adjacent two lenses 14, 15 15 to improve the imaging quality; and, the second ring member 12 only serves as an internal spacer ring, and forms a V-shaped or cup-shaped cross-section ring groove structure between the second ring member 12 and the first ring member 11 to generate light Traps are used to achieve the function of eliminating stray light. Furthermore, the spacer ring design of the present invention has an annular groove, which has more than two annular parts, and can be separately manufactured by injection molding with small tolerance and high precision.

Please refer to FIGS. 4a and 4b again. In this embodiment, the first inner edge surface 112 of the first ring member 11 is adjacent to the fourth surface 124 and the second outer edge surface of the second ring member 12 121. The first inner edge surface 112 of the first ring component 11 can form a groove 110, and the second ring component 12 is disposed in the groove 110 of the first inner edge surface 112. In another embodiment, the first inner edge surface 112 of the first annular component 11 may also form a plane or step, and the second annular component 12 is disposed on the plane or the plane of the first inner edge surface 112. In the ladder. The groove 110, the plane or the step can provide a larger contact area, so that the first ring component 11 and the second ring component 12 can be easily stacked and combined.

Fig. 6 is a schematic partial cross-sectional view of a spacer ring according to another embodiment of the present invention. The first inner edge surface 112 and the second inner edge surface 122 of the annular groove 100 are provided with an anti-reflection layer 102. The anti-reflection layer 102 is disposed on the first inner edge surface 112 and the second inner edge surface 122 by a coating process or an ink coating process. During the coating process, the material of the anti-reflection layer 102 is a dielectric coating or a metal material coating. For example, the coating process uses a physical vapor deposition method to coat one or more layers of dielectric coating or metal materials (such as titanium oxide, silicon oxide, magnesium fluoride and other metal compounds as materials) to change the transmission characteristics of light waves and make The visible light transmittance and reflectance of the first inner edge surface 112 and the second inner edge surface 122 of the annular groove 100 are changed, thereby reducing the stray light generated during imaging. During the ink coating process, the material of the anti-reflection layer 102 is matting ink or graphene compound. For example, the inking process uses an ink applicator to add matting ink to the surfaces of the first inner edge surface 112 and the second inner edge surface 122 of the annular groove 100 (GT7), graphene compounds and other coatings that reduce reflectivity. Alternatively, the ink coating process uses a photoprinting method: matting ink (GT7), graphene compounds, etc. are transferred to the surfaces of the first inner edge surface 112 and the second inner edge surface 122 of the annular groove 100 with soft silicone.

7a and 7b are schematic partial perspective cross-sectional views of a spacer ring according to another embodiment of the present invention. The first inner edge surface 112 of the first ring member 11 and the second inner edge surface 122 of the second ring member 12 are provided with a plurality of stray light elimination structures 103, and each of the stray light elimination structures is generally S-shaped concave Grooves or ㄑ-shaped concave grooves to produce better light trap effect.

Please refer to FIG. 2a again. In this embodiment, the first ring component 11 and the second ring component 12 are sequentially stacked and assembled along the optical axis I, such as the first ring component 11 and the second ring component 12 It is combined and fixed by stacking, locking or snapping. The refractive index of the material of the first ring component 11 is greater than that of the material of the second ring component 12, so that the light from the object side can easily produce a full spectrum at the interface between the first ring component 11 and the second ring component 12 The effect of reflection. Furthermore, the first ring component 11 is adjacent to the lens 14 and the lens 15, and the second ring component 12 is not adjacent to the lens 14. Since the first annular component 11 is adjacent to the lens 14 and the lens 15, the first annular component 11 can be used as an outer spacer ring. The thickness of the outer spacer ring determines the distance between two adjacent lenses 14, 15 for control The air gap between the two adjacent lenses 14, 15 improves the imaging quality; and, since the second ring member 12 is not adjacent to the lens 14, the second ring member 12 only serves as an inner spacer ring and is connected to the first ring. An annular groove structure with a V-shaped or cup-shaped cross-section is formed between an annular component 11 to generate light traps to achieve the function of eliminating stray light.

Please refer to FIG. 2b again. In another embodiment, the second ring component 12 and the first ring component 11 are stacked and assembled in sequence along the optical axis I. The refractive index of the material of the second annular component 12 is greater than that of the first annular component 11, so that the light from the object side is easily generated at the interface between the second annular component 12 and the first annular component 11. The effect of reflection. Furthermore, the first ring component 11 is adjacent to the lens 14 and the lens 15, and the second ring component 12 is not adjacent to the lens 15. Since the first ring part 11 is adjacent to the lens 14 and the lens 15, the first ring part The member 11 serves as an outer spacer ring, and the thickness of the outer spacer ring determines the distance between two adjacent lenses 14, 15 to control the air gap between the two adjacent lenses 14, 15 to improve the imaging quality; and, due to the If the second ring member 12 is not adjacent to the lens 15, the second ring member 12 only serves as an internal spacer ring, and forms a V-shaped or cup-shaped cross-section ring groove structure between the second ring member 12 and the first ring member 11 to generate light traps. , Used to achieve the function of stray light elimination

To sum up, it only describes the preferred embodiments or examples of the technical means adopted by the present invention to solve the problems, and is not used to limit the scope of implementation of the patent of the present invention. That is to say, all changes and modifications that are consistent with the scope of the patent application of the present invention or made in accordance with the scope of the patent of the present invention are all covered by the scope of the patent of the present invention.

1: Lens module

10: Spacer ring

100: ring groove

101: opening

11: The first ring part

12: The second ring part

13: lens

14: lens

15: lens

16: shading plate

17: filter

18: imaging surface

I: Optical axis

Claims (16)

A spacer ring is defined with a radial direction and an axial direction perpendicular to each other. The spacer ring includes: a first annular component having a first maximum thickness in the axial direction; and a second annular component with The first annular component is arranged overlapping in the radial direction and the axial direction, wherein: the first annular component includes a first inner edge surface, and the second annular component includes a second inner edge surface, the first The inner edge surface and the second inner edge surface form an annular groove, an opening of the annular groove faces an axis of the spacer ring, and the size of the opening gradually increases in a direction toward the axis along the radial direction; and A ring-shaped component and the second ring-shaped component have a second maximum thickness at a position where they overlap in the axial direction, and the first maximum thickness is greater than the second maximum thickness. The spacer ring described in claim 1, wherein: the first ring member further includes: a first surface and a second surface opposed to each other, and the second ring member further includes: a third surface and A fourth surface, wherein the first surface is closer to the third surface than the second surface; the first maximum thickness is along the axis between the first surface and the second surface of the first ring component And the second maximum thickness is the maximum distance in the axial direction between the second surface of the first annular component and the third surface of the second annular component. The spacer ring described in item 2 of the scope of patent application, wherein the first surface, the first surface The tangent directions of the two surfaces, the third surface and the fourth surface are perpendicular to the axial direction. The spacer ring described in item 2 of the scope of patent application, wherein the first ring member includes: a first outer edge surface, and the second ring member includes: a second outer edge surface, the first outer edge surface And the second outer edge surface are respectively opposite to the first inner edge surface and the second inner edge surface, and the diameter of the first outer edge surface is larger than the diameter of the second outer edge surface. The spacer ring described in item 4 of the scope of patent application, wherein the first inner edge surface of the first ring member is adjacent to the fourth surface and the second outer edge surface of the second ring member. The spacer ring described in item 5 of the scope of patent application, wherein the first inner edge surface of the first ring component forms a groove, a plane or a step, and the second ring component is disposed in the groove, In the plane or in the ladder. The spacer ring described in the first item of the scope of patent application, wherein the opening size of the annular groove is gradually larger in a V-shaped or cup-shaped section along the radial direction toward the axis. As described in the first item of the scope of patent application, the surface of the annular groove is provided with a plurality of stray light elimination structures, and each of the stray light elimination structures is generally S-shaped or ㄑ-shaped. In the spacer ring described in item 1 of the scope of patent application, an anti-reflection layer is provided on the surface of the annular groove. The spacer ring described in item 9 of the scope of patent application, wherein the anti-reflection layer is disposed on the surface of the annular groove by a coating process or an inking process. The spacer ring described in item 10 of the scope of patent application, wherein during the coating process, the material of the anti-reflection layer is dielectric coating or metal material coating; and during the ink coating process, the material of the anti-reflection layer For matting ink or graphene compound. A lens module includes, in order from the object side to the image side, a first lens, a spacer ring, and a second lens; The spacer ring is the spacer ring as described in any one of items 1 to 11 in the scope of the patent application. For the lens module described in item 12 of the scope of patent application, wherein the first ring member and the second ring member are sequentially stacked and combined along an optical axis, and the refractive index of the material of the first ring member is greater than that of the first ring member 2. The refractive index of the material of the ring component. For the lens module described in claim 12, wherein the first ring component and the second ring component are stacked and combined in sequence along an optical axis, and the first ring component is adjacent to the first lens and the first lens. Two lenses, and the second ring component is not adjacent to the first lens. For the lens module described in claim 12, wherein the second ring-shaped part and the first ring-shaped part are sequentially stacked and combined along an optical axis, and the material refractive index of the second ring-shaped part is greater than that of the first ring-shaped part. The refractive index of the material of the ring component. For the lens module described in claim 12, wherein the second ring component and the first ring component are sequentially stacked and combined along an optical axis, and the first ring component is adjacent to the first lens and the first lens. Two lenses, and the second ring component is not adjacent to the second lens.

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