TWI804351B - Optical lens element - Google Patents

Abstract

An optical lens element includes an optical region and a non-optical region surrounding and contacting the optical region, and includes, in the non-optical region, an outer annular surface, a bearing surface and at least two annular steps that contact each other and are located between the outer annular surface and the bearing surface. Therefore, the amount of lens flare occurring at the periphery portion of the optical lens can be reduced.

Description

optical lens

The invention relates to an optical lens, in particular to an optical lens with an outer diameter structure capable of reducing stray light.

Most of the existing optical lenses, such as the optical lens 100 shown in FIG. 1 , have the problem of stray at the outer diameter thereof, and the stray will affect the imaging quality. In order to avoid the generation of stray, the existing practice is to coat the lens surface of the optical lens 100 located in the non-optical region (such as the outer peripheral edge 112 between the bearing surface 111 and the outer ring surface 130 in the object side 110 of the optical lens 100). ink to form a light-shielding layer. The bearing surface refers to the part on the object side or the image side for bearing against another object (such as but not limited to another optical lens or lens barrel). However, in the process of ink application, the ink INK before drying is affected by gravity, which will cause vertical flow problems, which will easily cause the ink layer to be thin at the top and thick at the bottom, as shown in Figure 2A and 2B.

Therefore, an object of the present invention is to provide an optical lens that can greatly reduce the occurrence of strays at the outer diameter.

According to an embodiment of the present invention, an optical lens is provided, which has an optical zone, a non-optical zone surrounding and connecting the optical zone, an outer ring surface located in the non-optical zone, a bearing surface and at least two annular steps part, the at least two annular stepped parts are connected and located between the outer ring surface and the bearing surface.

Optionally, the at least two annular stepped portions are formed on the object side or image side of the optical lens located in the non-optical zone.

Optionally, the optical lens is respectively provided with the at least two annular steps on the object side and the image side of the non-optical zone.

Optionally, each of the annular steps has a first annular surface facing the extension surface of the outer annular surface and a second annular surface connected to the first annular surface and opposite to the extension surface of the bearing surface, the first annular surface The included angle between a torus and a horizontal axis parallel to the central axis of the optical lens is θ1, and the following conditions are satisfied: –89.9ﾟ≤θ1≤89.9ﾟ.

Optionally, each of the annular steps has a first annular surface facing the extension surface of the outer annular surface and a second annular surface connected to the first annular surface and opposite to the extension surface of the bearing surface, the first annular surface The included angle between the two torus and a vertical axis perpendicular to the central axis of the optical lens is θ2, and the following conditions are satisfied: –89.9ﾟ≦θ2≦89.9ﾟ.

Optionally, the total width of the at least two annular steps on a vertical axis perpendicular to the central axis of the optical lens is H1, the width of the non-optical zone on the vertical axis is H2, and the following conditions are met : 0.05≦H1∕H2≦0.74.

Optionally, the total thickness of the at least two annular steps on a horizontal axis parallel to the central axis of the optical lens is D1, the thickness of the non-optical zone on the horizontal axis is D2, and the following conditions are met: 0.07≦D1∕D2≦0.88.

Optionally, each of the annular steps has a first annular surface facing the extension surface of the outer annular surface and a second annular surface connected to the first annular surface and opposite to the extension surface of the bearing surface, the first annular surface A torus is inclined, horizontal, convex or concave.

Optionally, each of the annular steps has a first annular surface facing the extension surface of the outer annular surface and a second annular surface connected to the first annular surface and opposite to the extension surface of the bearing surface, the first annular surface The two rings are oblique, vertical, convex or concave.

Optionally, a light-shielding layer is provided on the at least two annular steps.

Please refer to FIG. 3 and FIG. 4 , the optical lens 200 provided by the present invention according to an embodiment includes an optical zone S1, a non-optical zone S2 surrounding the optical zone S1, an object side 210 facing the object side, and an object side 210 facing the image side. The image side 220 and an outer ring surface 230 located between the object side 210 and the image side 220 and connecting the object side 210 and the image side 220 . The outer annular surface 230 is located in the non-optical zone S2.

The object side surface 210 includes a supporting surface 211 , an outer peripheral edge 212 and a stepped structure 213 in the non-optical region S2 . The bearing surface 211 is closer to the optical zone S1 , the outer peripheral edge 212 is closer to the outer ring surface 230 , and the stepped structure 213 is disposed on the outer peripheral edge 212 . In this embodiment, the bearing surface 211 refers to the part on the object side 210 used to bear against another object (such as but not limited to another optical lens or lens barrel); and in other embodiments, the bearing surface It may be a part on the image side for resting on another object (such as but not limited to another optical lens or lens barrel), such as the supporting surface 421 shown in FIG. 5B . The stepped structure 213 is annular, located between the bearing surface 211 and the outer ring surface 230 and connected to the bearing surface 211 and the outer ring surface 230 . Although the stepped structure 213 in this embodiment is disposed on the object side surface 210 of the optical lens 200 located in the non-optical region S2, the present invention is not limited thereto. In other embodiments, according to actual needs, the stepped structure can be changed to be arranged on the image side where the optical lens is located in the non-optical zone, as shown in Figure 5B; or, the optical lens is located on the object side and the image side in the non-optical zone All are provided with a ladder structure.

The total thickness of the stepped structure 213 on a horizontal axis X parallel to the central axis of the optical lens 200 is D1, the thickness of the non-optical region S2 on the horizontal axis X is D2, and the following conditions are satisfied: 0.07≦D1∕D2≦0.88 , and even satisfy: 0.10≦D1∕D2≦0.75. The total width of the stepped structure 213 on a vertical axis Y perpendicular to the central axis of the optical lens 200 is H1, the width of the non-optical region S2 on the vertical axis Y is H2, and the following conditions are satisfied: 0.05≦H1∕H2≦0.74 , and even satisfy: 0.07≦H1∕H2≦0.64.

The stepped structure 213 includes at least two connected annular stepped portions 214 . Each annular stepped portion 214 includes a first annular surface 2141 facing the extending surface of the outer annular surface 230 and a second annular surface 2142 connected to the first annular surface 2141 and facing the extending surface of the opposing bearing surface 211 . In this embodiment, the first annular surface 2141 is, for example but not limited to, an inclined surface; in other embodiments, the first annular surface 2141 can also be changed into a concave surface, a convex surface or an approximately horizontal surface. In this embodiment, the second annular surface 2142 is, for example but not limited to, an inclined surface; in other embodiments, the second annular surface 2142 can also be changed into a convex surface, a concave surface or an approximately vertical surface.

θ1

89.9°；-89.9°≦θ2≦89.9°；θ1≠0°；及θ2≠0°，甚至也滿足：-75°

θ1

75°；及-30°≦θ2≦30°。夾角θ1越小，會使環形階梯部214密度(亦即單位面積可形成環形階梯部214的數量)越大，降低雜散效果較佳；夾角θ2越小，也會使環形階梯部214密度越大，降低雜散效果較佳。並且，相鄰的第一環面2141與第二環面2142之間的夾角例如但不限於是大於0度且小於180度。 In each annular step portion 214, the included angle between the first annular surface 2141 and the horizontal axis X is θ1, the included angle between the second annular surface 2142 and the vertical axis Y is θ2, and the following conditions are satisfied: -89.9°

θ1

89.9°; -89.9°≦θ2≦89.9°; θ1≠0°; and θ2≠0°, and even: -75°

θ1

75°; and -30°≦θ2≦30°. The smaller the included angle θ1, the greater the density of the annular stepped portion 214 (that is, the number of annular stepped portions 214 that can be formed per unit area), the better the effect of reducing stray; the smaller the included angle θ2, the higher the density of the annular stepped portion 214. Larger, the effect of reducing spurious is better. Moreover, the included angle between adjacent first toroidal surfaces 2141 and second toroidal surfaces 2142 is, for example but not limited to, greater than 0 degrees and less than 180 degrees.

Please refer to the optical lenses of Example 1 to Example 3 listed in Table 1 below, and use Example 1~3 as the experimental group 1~3 to carry out the illumination test at the outer diameter with the corresponding control group 1~3, that is, test 1~ 3.

<test 1>

The control group 1 is the optical lens 100 as shown in Figure 1, and the experimental group 1 is the optical lens 200 as shown in Figure 3. The difference between the two is that the outer periphery 112 of the object side surface 110 of the control group 1 does not have any stepped structure, while the experimental group 1 has no stepped structure. The outer peripheral edge 212 of the object side surface 210 of the set 1 is provided with the stepped structure 213 of the example 1. As shown in FIG. In the illuminance test, the illuminance measured by the control group 1 was 15295000 Lux (Lux), and the illuminance measured by the experimental group 1 was 1724600 Lux. Compared with the control group 1, the stray light energy generated in the experimental group 1 was reduced by 13570400 Lux.

<test 2>

The control group 2 is the optical lens 300 shown in Figure 5A, and the experimental group 2 is the optical lens 400 shown in Figure 5B. The outer peripheral edge 322 between them does not have any stepped structure, while the outer peripheral edge 422 between the bearing surface 421 and the outer annular surface 430 in the image side 420 of the experimental group 2 is provided with the stepped structure 423 of Example 2. In the illuminance test, the illuminance measured by the control group 2 was 1426800 Lux, and the illuminance measured by the experimental group 2 was 618570 Lux. Compared with the control group 2, the stray light energy generated in the experimental group 2 was reduced by 808230 Lux.

<test 3>

The control group 3 is the optical lens 500 shown in Figure 6A, and the experimental group 3 is the optical lens 600 shown in Figure 6B. There is no stepped structure on the outer peripheral edge 512 between them, while the outer peripheral edge 612 between the bearing surface 611 and the outer ring surface 630 in the object side 610 of the experimental group 3 is provided with the stepped structure 613 of Example 3. In the illuminance test, the illuminance measured by the control group 3 was 1,174,400 Lux, and the illuminance measured by the experimental group 3 was 448,300 Lux. Compared with the control group 3, the stray light energy generated in the experimental group 3 was reduced by 726100 Lux.

From the above tests 1 to 3, it can be known that setting the stepped structure at the outer diameter of the optical lens can greatly reduce the stray light energy generated at the outer diameter of the optical lens, thereby reducing the impact of stray light on the imaging quality. Moreover, the greater the ratio of the total thickness D1 of the stepped structure on the horizontal axis X to the thickness D2 of the non-optical zone on the horizontal axis X (ie D1/D2), the smaller the stray light energy generated; the stepped structure on the vertical axis The larger the ratio of the total width H1 on Y to the width H2 of the non-optical zone on the vertical axis Y (ie H1/H2), the smaller the stray light energy generated. Even, it is possible to reduce the stray light energy generated at the outer diameter of the optical lens to zero through the design of the stepped structure without additional coating of a light-shielding layer on the outer diameter.

In addition, in the invention, a light-shielding layer can also be provided on the stepped structure of the optical lens. For example, as shown in FIG. 7 , a light shielding layer BL is disposed on the stepped structure 713 formed on the outer periphery 712 of the optical lens 700 . Since an annular groove is formed between two adjacent annular step portions 714 , ink will enter and remain in each annular groove during ink application. In this way, not only can the ability of eliminating stray light energy at the outer diameter of the optical lens 700 be enhanced, but also the thickness of the light-shielding layer BL formed on the stepped structure 713 can be avoided from being thicker on the side close to the bearing surface 711 or the outer ring surface 730. Thick cases occur.

Although the present invention is disclosed above with the aforementioned embodiments, these embodiments are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, all changes, modifications and combinations of implementations are within the scope of patent protection of the present invention. For the scope of protection defined by the present invention, please refer to the appended scope of patent application.

100,200,300,400,500,600,700: optical lens 110,210,510,610: Object side 111,211,321,421,511,611,711: bearing surface 112,212,322,422,512,612,712: outer periphery 213,423,613,713: ladder structure 214,714: Circular steps 2141:First torus 2142:Second torus 220, 320, 420: Like the side 130,230,330,430,530,630,730: outer ring surface BL: shading layer D1: total thickness D2: Thickness H1: total width H2: width INK: Ink S1: optical zone S2: Non-optical zone X: horizontal axis Y: vertical axis θ1, θ2: included angle

Other aspects and advantages of the present invention can be learned by reading the following detailed description with accompanying drawings. In the accompanying drawings: Fig. 1 is the local schematic diagram of existing optical lens; Fig. 2A and Fig. 2B are the schematic diagrams that ink is applied to the optical lens of Fig. 1 in different directions; Fig. 3 is a partial schematic diagram of an optical lens provided according to an embodiment of the present invention; Fig. 4 is a partially enlarged view of the optical lens of Fig. 3, used to present the stepped structure at the outer diameter; 5A is a partial schematic view of an existing optical lens; 5B is a partial schematic diagram of an optical lens provided according to an example of the present invention; FIG. 6A is a partial schematic diagram of an existing optical lens; 6B is a partial schematic diagram of an optical lens provided according to an example of the present invention; and FIG. 7 is a partial schematic diagram of an optical lens provided according to an embodiment of the present invention, for showing that a light-shielding layer is disposed on the stepped structure at the outer diameter.

200: optical lens

210: Object side

211: bearing surface

212: outer periphery

213: Ladder structure

220: Like the side

230: Outer ring surface

D1: total thickness

D2: Thickness

H1: total width

H2: width

S1: optical zone

S2: Non-optical zone

X: horizontal axis

Y: vertical axis

Claims (9)

An optical lens has an optical zone, a non-optic zone surrounding and connecting the optical zone, an outer ring surface located in the non-optical zone, a supporting surface and at least two annular steps, the at least two annular steps part connected and located between the outer ring surface and the bearing surface, each of the annular stepped parts has a first ring surface facing the extension surface of the outer ring surface and a first ring surface connected to the first ring surface and facing the bearing surface A second annular surface of the extension surface, the first annular surface of the annular step portion closest to the outer annular surface is connected to the outer annular surface and is not parallel to the outer annular surface, and the second annular surface of the annular stepped portion closest to the bearing surface The second torus is connected to the bearing surface and is not parallel, the included angle between the second torus and a vertical axis perpendicular to the central axis of the optical lens is θ2, and the following conditions are satisfied: -89.9°≦θ2≦89.9° and θ2≠0°. The optical lens according to claim 1, wherein the at least two annular stepped portions are formed on the object side or the image side of the optical lens located in the non-optical zone. The optical lens according to claim 1, wherein the optical lens is respectively provided with the at least two annular steps on the object side and the image side of the non-optical region. The optical lens according to claim 1, wherein the angle between the first torus and a horizontal axis parallel to the central axis of the optical lens is θ1, and the following conditions are satisfied: -89.9°

θ1

89.9° and θ1≠0°. According to the optical lens described in Claim 1, wherein the total width of the at least two annular steps perpendicular to the vertical axis is H1, the width of the non-optical zone on the vertical axis is H2, and the following conditions are satisfied: 0.05 ≦H1/H2≦0.74. According to the optical lens described in claim 1, wherein the total thickness of the at least two annular steps on a horizontal axis parallel to the central axis of the optical lens is D1, the non- The thickness of the optical zone on the horizontal axis is D2 and satisfies the following condition: 0.07≦D1/D2≦0.88. The optical lens according to claim 1, wherein the first annular surface is inclined, convex or concave. The optical lens according to claim 1, wherein the second toroidal surface is inclined, convex or concave. The optical lens according to claim 1, wherein a light-shielding layer is disposed on the at least two annular steps.

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