TWI880552B - Wide-angle lens assembly - Google Patents

Abstract

A wide-angle lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first lens is with negative refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens is with refractive power. The third lens is with refractive power. The fourth lens is with positive refractive power. The fifth lens is with negative refractive power. The sixth lens is with refractive power and includes a concave surface facing the image side. The seventh lens is with positive refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged in order from the object side to the image side along an optical axis.

Description

Wide-angle lens (fifty-four)

The present invention relates to a wide-angle lens.

The current development trend of wide-angle lenses is not only to develop towards a larger field of view, but also to have the characteristics of miniaturization and high resolution in accordance with different application requirements. The conventional wide-angle lenses can no longer meet the current needs. A new wide-angle lens structure is needed to meet the requirements of a large field of view, miniaturization and high resolution at the same time.

In view of this, the main purpose of the present invention is to provide a wide-angle lens with a larger field of view, a shorter total lens length, a higher resolution, but still with good optical performance.

The present invention provides a wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has negative refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens has refractive power. The third lens has refractive power. The fourth lens has positive refractive power. The fifth lens has negative refractive power. The sixth lens has refractive power and includes a concave surface facing the image side. The seventh lens has positive refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the wide-angle lens of the present invention meets the above characteristics and does not require other additional characteristics or conditions, the basic function of the wide-angle lens of the present invention can be achieved.

The present invention provides another wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has negative refractive power. The second lens has refractive power. The third lens has refractive power. The fourth lens has positive refractive power. The fifth lens has negative refractive power. The sixth lens has refractive power and includes a concave surface facing an image side. The seventh lens has positive refractive power and includes a convex surface facing an object side and a flat surface facing the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the wide-angle lens of the present invention meets the above characteristics and does not require other additional characteristics or conditions, the basic function of the wide-angle lens of the present invention can be achieved.

The second lens has positive refractive power, the third lens has positive refractive power, and the sixth lens has positive refractive power.

The first lens is a meniscus lens, and includes a convex surface facing the object side and a concave surface facing the image side, the second lens is a meniscus lens, and includes a concave surface facing the object side and a convex surface facing the image side, the third lens includes a convex surface facing the object side, the fourth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side, the fifth lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side, the sixth lens is a meniscus lens, and may further include a convex surface facing the object side, the seventh lens is a plano-convex lens, and includes a convex surface facing the object side and a flat surface facing the image side.

The third lens may further include another concave surface facing the image side or another convex surface facing the image side.

There are two lenses with positive refractive power between the object side and an aperture.

The second lens is a meniscus lens, the sixth lens is a meniscus lens, the first lens has opposite refractive power to the second lens, the object side surface of the first lens is similar to the image side surface of the second lens, the first lens has opposite refractive power to the sixth lens, the image side surface of the first lens is similar to the image side surface of the sixth lens.

The present invention provides another wide-angle lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens is a meniscus lens with refractive power. The second lens has refractive power. The third lens has refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth lens has refractive power. The seventh lens has refractive power. At least one lens among the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is a biconcave lens. At least two lenses with positive refractive power are included between the two lenses with negative refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from an object side to an image side along an optical axis.

The first lens has negative refractive power, the second lens has positive refractive power, the third lens has positive refractive power, the fourth lens has positive refractive power, the fifth lens has negative refractive power and includes a concave surface facing the object side and another concave surface facing the image side, the sixth lens has positive refractive power, and the seventh lens has positive refractive power.

The wide-angle lens of the present invention may further include an aperture disposed between the third lens and the fourth lens, and the wide-angle lens meets at least one of the following conditions: -1mm<fb+Rc<2mm;0.14<Ra/fc<6.62; 3mm ^-1 <Vdb/Rc<7mm ^-1 ; 0.14mm<Ra/Vdb<1.34mm;-2.3<f1/f<-1.5;-38.3<Vdd/(fc/fb)<-15.2;0.14<f/TTL<0.18;3.1<TTL/BFL<8.1;4.5<L/f<6.9;3.4<R11/f<5.5; wherein f is an effective focal length of the wide-angle lens, f1 is an effective focal length of the first lens, fb is an effective focal length of the lens between the aperture and an imaging plane and the second lens closest to the aperture, fc is an effective focal length of the lens closest to the imaging plane, TTL is a distance from an object side of the first lens to the imaging plane on the optical axis, BFL is a distance from an image side of the seventh lens to the imaging plane on the optical axis, L is a distance from the object side of the first lens to the lens closest to the imaging plane is a distance between the aperture and the image side on the optical axis, Ra is a curvature radius of an object side surface of the lens closest to the aperture between the aperture and the imaging plane, Rc is a curvature radius of an object side surface of the lens closest to the imaging plane, Vdb is an Abbe coefficient of the lens second closest to the aperture between the aperture and the imaging plane, Vdd is an Abbe coefficient of the lens second closest to the imaging plane, and R11 is a curvature radius of the object side surface of the first lens.

In order to make the above-mentioned purposes, features, and advantages of the present invention more clearly understood, the following specifically cites a preferred embodiment and provides a detailed description with the accompanying drawings.

4, 5, 6: Wide-angle lens

L41, L51, L61: First lens

L42, L52, L62: Second lens

L43, L53, L63: Third lens

L44, L54, L64: Fourth lens

L45, L55, L65: Fifth lens

L46, L56, L66: Sixth lens

L47, L57, L67: Seventh lens

OF4, OF5, OF6: filter

CG5, CG6: Protective glass

IMA4, IMA5, IMA6: Imaging surface

ST4, ST5, ST6: aperture

OA4, OA5, OA6: optical axis

S41, S51, S61: Object side of the first lens

S42, S52, S62: first lens image side

S43, S53, S63: Second lens object side

S44, S54, S64: Second lens image side

S45, S55, S65: Third lens object side

S46, S56, S66: Third lens image side

S48, S58, S68: fourth lens object side

S49, S59, S69: Fourth lens image side

S410, S510, S610: Fifth lens object side

S411, S511, S611: Fifth lens image side

S412, S512, S612: sixth lens object side

S413, S513, S613: Sixth lens image side

S414, S514, S614: seventh lens object side

S415, S515, S615: Side view of the seventh lens

S416, S516, S616: Object side of filter

S417, S517, S617: filter image side

S518, S618: Protect the side of the glass

S519, S619: Protective glass image side

S47, S57, S67: aperture surface

Figure 1 is a schematic diagram of the lens configuration and optical path of the fourth embodiment of the wide-angle lens of the present invention.

Figures 2, 3, and 4 are diagrams of longitudinal aberration, field curvature, and distortion according to the fourth embodiment of the wide-angle lens of the present invention.

Figure 5 is a schematic diagram of the lens configuration and optical path of the fifth embodiment of the wide-angle lens of the present invention.

Figures 6, 7, and 8 are longitudinal aberration diagrams, field curvature diagrams, and distortion diagrams of the fifth embodiment of the wide-angle lens of the present invention.

Figure 9 is a schematic diagram of the lens configuration and optical path of the sixth embodiment of the wide-angle lens of the present invention.

Figures 10, 11, and 12 are longitudinal aberration diagrams, field curvature diagrams, and distortion diagrams of the sixth embodiment of the wide-angle lens of the present invention.

The wide-angle lens of the first embodiment of the present invention comprises: a first lens having negative refractive power and a convex surface facing an object side; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; refractive power; a sixth lens, the sixth lens having refractive power and including a concave surface facing an image side; and a seventh lens, the seventh lens having positive refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from the object side to the image side along an optical axis. When imaging, the light from the object side is finally imaged on an imaging plane. The first embodiment of the present invention can achieve basic operation through the above design.

The wide-angle lens of the second embodiment of the present invention comprises: a first lens, which is a meniscus lens with refractive power; a second lens, which has refractive power; a third lens, which has refractive power; a fourth lens, which has refractive power; a fifth lens, which has refractive power; a sixth lens, which has refractive power; and a seventh lens, which has refractive power. power; wherein only one of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is a biconcave lens; wherein two lenses with negative refractive power include two lenses with positive refractive power between them; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from an object side to an image side along an optical axis. During imaging, the light from the object side is finally imaged on an imaging plane. The second embodiment of the present invention can achieve basic operation through the above design.

The wide-angle lens of the third embodiment of the present invention comprises: a first lens having negative refractive power and including a convex surface facing an object side; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; a sixth lens having refractive power and including a concave surface facing an image side; and a seventh lens having positive refractive power; wherein the second lens is curved. Meniscus lens; wherein the sixth lens is a meniscus lens; wherein the first lens has opposite refractive power to the second lens; wherein the object side surface of the first lens is similar to the image side surface of the second lens; wherein the first lens has opposite refractive power to the sixth lens; wherein the image side surface of the first lens is similar to the image side surface of the sixth lens; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from the object side to the image side along an optical axis. When imaging, the light from the object side is finally imaged on an imaging plane. The third embodiment of the present invention can achieve basic operation through the above design.

In addition, in another embodiment, the wide-angle lens of each of the above embodiments can further meet the condition: -1mm<fb+Rc<2mm; wherein fb is an effective focal length of a lens second closest to the aperture between an aperture and the imaging plane, and Rc is a radius of curvature of an object side surface of the lens closest to the imaging plane, to effectively correct the angle at which light is incident on the photosensitive element. Basic operation can be achieved by meeting this condition. In yet another embodiment, the performance degradation caused by the high temperature environment can be effectively compensated and the Monte Carlo yield can be improved by further satisfying the condition: 0.14<Ra/fc<6.62; wherein Ra is the radius of curvature of an object side surface of the lens closest to the aperture between the aperture and the imaging plane, and fc is the effective focal length of the lens closest to the imaging plane. Basic operation can be achieved by satisfying this condition. In yet another embodiment, the lens sensitivity can be effectively corrected and the Monte Carlo yield can be improved by further satisfying the condition: 3mm ^-1 <Vdb/Rc<7mm ^-1 ; wherein Vdb is the Abbe coefficient of the lens second closest to the aperture between the aperture and the imaging plane, and Rc is the radius of curvature of the object side surface of the lens closest to the imaging plane. Basic operation can be achieved by satisfying this condition. In yet another embodiment, the influence of stray light on the photosensitive element can be effectively reduced by further satisfying the condition: 0.14mm<Ra/Vdb<1.34mm; wherein Ra is the radius of curvature of the object side surface of the lens closest to the aperture between the aperture and the imaging plane, and Vdb is the Abbe coefficient of the lens second closest to the aperture between the aperture and the imaging plane, and basic operation can be achieved by satisfying this condition. In yet another embodiment, the field of view can be effectively improved by further satisfying the condition: -2.3<f1/f<-1.5; wherein f1 is an effective focal length of the first lens, and f is an effective focal length of the wide-angle lens, and basic operation can be achieved by satisfying this condition. In yet another embodiment, the imaging quality can be effectively improved by further satisfying the condition: -38.3<Vdd/(fc/fb)<-15.2; wherein Vdd is the Abbe coefficient of the lens second closest to the imaging plane, fc is the effective focal length of the lens closest to the imaging plane, and fb is the effective focal length of the lens second closest to the aperture between the aperture and the imaging plane. Basic operation can be achieved by satisfying this condition. In yet another embodiment, the wide-angle lens can be further reduced in size by satisfying the condition: 0.14<f/TTL<0.18; wherein f is the effective focal length of the wide-angle lens, and TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, and basic operation can be achieved by satisfying this condition. In yet another embodiment, the wide-angle lens can be further reduced in size by satisfying the condition: 3.1<TTL/BFL<8.1; wherein TTL is the distance from the object side of the first lens to the imaging plane on the optical axis, and BFL is the distance from the image side of the seventh lens to the imaging plane on the optical axis, and basic operation can be achieved by satisfying this condition. In yet another embodiment, the wide-angle lens volume can be effectively reduced by further satisfying the condition: 4.5<L/f<6.9; wherein L is a distance on the optical axis from the object side of the first lens to the image side of the lens closest to the imaging surface, and f is the effective focal length of the wide-angle lens. Basic operation can be achieved by satisfying this condition. In yet another embodiment, the imaging quality can be effectively improved by further satisfying the condition: 3.4<R11/f<5.5; wherein R11 is a radius of curvature of the object side of the first lens, and f is the effective focal length of the wide-angle lens. Basic operation can be achieved by satisfying this condition.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7 and Table 8 below, wherein Table 1, Table 4 and Table 7 are respectively tables of relevant parameters of each lens of the fourth embodiment to the sixth embodiment of the wide-angle lens according to the present invention, and Table 2, Table 5 and Table 8 are respectively tables of relevant parameters of the aspherical surface of the aspherical lens in Table 1, Table 4 and Table 7.

Figures 1, 5, and 9 are respectively schematic diagrams of the lens configuration and optical path of the fourth, fifth, and sixth embodiments of the wide-angle lens of the present invention. The first lens L41, L51, and L61 are meniscus lenses with negative refractive power, and their object side surfaces S41, S51, and S61 are convex surfaces, and the image side surfaces S42, S52, and S62 are concave surfaces. The object side surfaces S41, S51, and S61 and the image side surfaces S42, S52, and S62 are all spherical surfaces.

The second lenses L42, L52, and L62 are meniscus lenses with positive refractive power. Their object side surfaces S43, S53, and S63 are concave, and their image side surfaces S44, S54, and S64 are convex. The object side surfaces S43, S53, and S63 and the image side surfaces S44, S54, and S64 are all aspherical surfaces.

The third lenses L43, L53, and L63 have positive refractive power, and their object side surfaces S45, S55, and S65 are convex.

The fourth lens L44, L54, L64 is a biconvex lens with positive refractive power, and its object side surfaces S48, S58, S68 are convex surfaces, and the image side surfaces S49, S59, S69 are convex surfaces. The object side surfaces S48, S58, S68 and the image side surfaces S49, S59, S69 are all spherical surfaces.

The fifth lens L45, L55, and L65 are biconcave lenses with negative refractive power. The object side surfaces S410, S510, and S610 are concave surfaces, and the image side surfaces S411, S511, and S611 are concave surfaces. The object side surfaces S410, S510, and S610 and the image side surfaces S411, S511, and S611 are all aspherical surfaces.

The sixth lens L46, L56, and L66 are meniscus lenses with positive refractive power, and their object side surfaces S412, S512, and S612 are convex, and their image side surfaces S413, S513, and S613 are concave. The object side surfaces S412, S512, and S612 and the image side surfaces S413, S513, and S613 are all aspherical surfaces.

The seventh lens L47, L57, and L67 are plano-convex lenses with positive refractive power, and their object side surfaces S414, S514, and S614 are convex surfaces, and their image side surfaces S415, S515, and S615 are flat surfaces, and the object side surfaces S414, S514, and S614 are aspherical surfaces.

In addition, the wide-angle lenses 4, 5, and 6 can optimize the performance of the wide-angle lenses by satisfying at least one or all of the following conditions (1) to (10). The optimized performance is as described above, so it will not be repeated here:

-1mm<fb+Rc<2mm; (1)

0.14<Ra/fc<6.62; (2)

3mm ^-1 <Vdb/Rc<7mm ^-1 ; (3)

0.14mm<Ra/Vdb<1.34mm; (4)

-2.3<f1/f<-1.5； (5)

-38.3<Vdd/(fc/fb)<-15.2; (6)

0.14<f/TTL<0.18; (7)

3.1<TTL/BFL<8.1; (8)

4.5<L/f<6.9; (9)

3.4<R11/f<5.5; (10)

Wherein, f is an effective focal length of the wide-angle lens 4, 5, 6 in the fourth to sixth embodiments, f1 is an effective focal length of the first lens L41, L51, L61 in the fourth to sixth embodiments, fb is an effective focal length of the lens second closest to the aperture ST4, ST5, ST6 and the imaging surface IMA4, IMA5, IMA6 in the fourth to sixth embodiments, fc is an effective focal length of the lens closest to the imaging surface IMA4, IMA5, IMA6 in the fourth to sixth embodiments, and TTL is In the fourth to sixth embodiments, the object side surfaces S41, S51, S61 of the first lenses L41, L51, L61 are spaced from the imaging surfaces IMA4, IMA5, IMA6 on the optical axes OA4, OA5, OA6. BFL is the distance between the image side surfaces S415, S515, S615 of the seventh lenses L47, L57, L67 and the imaging surfaces IMA4, IMA5, IMA6 on the optical axes OA4, OA5, OA6 in the fourth to sixth embodiments. L is the distance between the image side surfaces S415, S515, S615 of the seventh lenses L47, L57, L67 and the imaging surfaces IMA4, IMA5, IMA6 on the optical axes OA4, OA5, OA6 in the fourth to sixth embodiments. 1 to the image side surface S415, S515, S615 of the lens closest to the imaging surface on the optical axis OA4, OA5, OA6, Ra is a curvature radius of the object side surface S48, S58, S68 of the lens closest to the aperture ST4, ST5, ST6 and the imaging surface IMA4, IMA5, IMA6 in the fourth to sixth embodiments, and Rc is a curvature radius of the object side surface S48, S58, S68 of the lens closest to the aperture ST4, ST5, ST6 between the aperture ST4, ST5, ST6 and the imaging surface IMA4, IMA5, IMA6 in the fourth to sixth embodiments. 414, S514, S614 is a radius of curvature, Vdb is an Abbe coefficient of a lens second closest to the aperture ST4, ST5, ST6 between the aperture ST4, ST5, ST6 and the imaging surface IMA4, IMA5, IMA6 in the fourth to sixth embodiments, Vdd is an Abbe coefficient of a lens second closest to the imaging surface IMA4, IMA5, IMA6 in the fourth to sixth embodiments, R11 is a radius of curvature of the object side surface S41, S51, S61 of the first lens L41, L51, L61 in the fourth to sixth embodiments. The wide-angle lens 4, 5, 6 can effectively shorten the total length of the lens, effectively improve the field of view, effectively improve the resolution, and effectively correct the aberration.

The fourth embodiment of the wide-angle lens of the present invention is described in detail. Referring to FIG. 1, the wide-angle lens 4 includes a first lens L41, a second lens L42, a third lens L43, an aperture ST4, a fourth lens L44, a fifth lens L45, a sixth lens L46, a seventh lens L47 and a filter OF4 in sequence from an object side to an image side along an optical axis OA4. When imaging, the light from the object side is finally imaged on an imaging surface IMA4. According to paragraphs 5 to 12 of [Implementation Method], the third lens L43 is a meniscus lens, whose image side surface S46 is a concave surface, and whose object side surface S45 and image side surface S46 are both aspherical surfaces; the object side surface S416 and image side surface S417 of the filter OF4 are both flat surfaces; by utilizing the above-mentioned lens, aperture ST4 and a design that satisfies at least one of conditions (1) to (10), the wide-angle lens 4 can effectively reduce the total length of the lens, effectively improve the field of view, effectively improve the resolution, and effectively correct aberrations. When the wide-angle lens of the present invention only satisfies condition (1), conditional formula (2), conditional formula (3), conditional formula (4) or conditional formula (6) and the first, fourth, fifth and seventh lenses have negative, positive, negative and positive refractive powers respectively, the object side surface of the first lens is convex and the image side surface is concave, and the image side surface of the sixth lens is concave, the basic action requirements can be achieved; or when the wide-angle lens only satisfies condition (1), conditional formula (2), conditional formula (3), conditional formula (4) or conditional formula (6) and the first, fourth and fifth lenses have negative, positive, negative and positive refractive powers respectively, the object side surface of the first lens is convex and the image side surface is concave, and the image side surface of the sixth lens is concave, the basic action requirements can be achieved. , the seven lenses have negative, positive, negative, and positive refractive powers respectively, the image side surface of the sixth lens is concave, the object side surface of the seventh lens is convex and the image side surface is flat, the basic action requirements can be met; or only condition (1), conditional formula (2), conditional formula (3), conditional formula (4) or conditional formula (6) are met, and at least two lenses between two lenses with negative refractive power have positive refractive power, and at least one lens from the second to the seventh lens is a biconcave lens, the basic action requirements can be met.

Table 1 is a table of relevant parameters of each lens of the wide-angle lens 4 in Figure 1.

The aspheric surface concavity z of the aspheric lens in Table 1 is obtained by the following formula:

z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ +Ch ⁸ +Dh ¹⁰

Where: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: cone coefficient; A~D: aspheric coefficient.

Table 2 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 1.

Table 3 shows the relevant parameter values of the wide-angle lens 4 of the fourth embodiment and the calculated values corresponding to conditions (1) to (10). It can be seen from Table 3 that the wide-angle lens 4 of the fourth embodiment can meet the requirements of conditions (1) to (10).

In addition, the optical performance of the wide-angle lens 4 of the fourth embodiment can also meet the requirements. As can be seen from Figure 2, the longitudinal aberration of the wide-angle lens 4 of the fourth embodiment is between -0.015mm and 0.05mm. As can be seen from Figure 3, the field curvature of the wide-angle lens 4 of the fourth embodiment is between -0.06mm and 0mm. As can be seen from Figure 4, the distortion of the wide-angle lens 4 of the fourth embodiment is between -100% and 0%. It is obvious that the longitudinal aberration, field curvature, and distortion of the wide-angle lens 4 of the fourth embodiment can be effectively corrected, thereby obtaining better optical performance.

The fifth embodiment of the wide-angle lens of the present invention is described in detail. Referring to FIG. 5 , the wide-angle lens 5 includes a first lens L51, a second lens L52, a third lens L53, an aperture ST5, a fourth lens L54, a fifth lens L55, a sixth lens L56, a seventh lens L57, a filter OF5, and a protective glass CG5 in sequence from an object side to an image side along an optical axis OA5. When imaging, the light from the object side is finally imaged on an imaging surface IMA5. According to paragraphs 5 to 12 of [Implementation Method], the third lens L53 is a meniscus lens, the image side surface S56 of which is a concave surface, and the object side surface S55 and the image side surface S56 are both aspherical surfaces; the object side surface S516 and the image side surface S517 of the filter OF5 are both planes; the object side surface S518 and the image side surface S519 of the protective glass CG5 are both planes; by using the above-mentioned lens, aperture ST5 and the design that satisfies at least one of conditions (1) to (10), the wide-angle lens 5 can effectively reduce the total length of the lens, effectively improve the field of view, effectively improve the resolution, and effectively correct aberrations. When the wide-angle lens of the present invention only satisfies condition (5), conditional formula (9) or conditional formula (10) and the first, fourth, fifth and seventh lenses have negative, positive, negative and positive refractive powers respectively, the object side surface of the first lens is convex and the image side surface is concave, and the image side surface of the sixth lens is concave, the basic action requirements can be achieved; or when the wide-angle lens only satisfies condition (5), conditional formula (9) or conditional formula (10) and the first, fourth, fifth and seventh lenses have negative, positive, negative and positive refractive powers respectively, the object side surface of the first lens is convex and the image side surface is concave, and the image side surface of the sixth lens is concave. The basic action requirement can be met by having negative, positive, negative, or positive refractive power, the image side surface of the sixth lens is concave, the object side surface of the seventh lens is convex, and the image side surface is flat; or the basic action requirement can be met by only satisfying condition (5), conditional formula (9), or conditional formula (10), and at least two lenses between the two lenses with negative refractive power have positive refractive power, and at least one lens from the second to the seventh lens is a biconcave lens.

Table 4 is a table of relevant parameters of each lens of the wide-angle lens 5 in Figure 5.

The definition of the aspheric surface concavity z of each lens in Table 4 is the same as the definition of the aspheric surface concavity z of each lens in Table 1 of the fourth embodiment, and will not be elaborated here.

Table 5 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 4.

Table 6 shows the relevant parameter values of the wide-angle lens 5 of the fifth embodiment and the calculated values of the corresponding conditions (1) to (10). It can be seen from Table 6 that the wide-angle lens 5 of the fifth embodiment can meet the requirements of conditions (1) to (10).

In addition, the optical performance of the wide-angle lens 5 of the fifth embodiment can also meet the requirements. As can be seen from Figure 6, the longitudinal aberration of the wide-angle lens 5 of the fifth embodiment is between -0.02mm and -0.005mm. As can be seen from Figure 7, the field curvature of the wide-angle lens 5 of the fifth embodiment is between -0.04mm and 0mm. As can be seen from Figure 8, the distortion of the wide-angle lens 5 of the fifth embodiment is between -100% and 0%. It is obvious that the longitudinal aberration, field curvature, and distortion of the wide-angle lens 5 of the fifth embodiment can be effectively corrected, thereby obtaining better optical performance.

The sixth embodiment of the wide-angle lens of the present invention is described in detail. Referring to FIG. 9 , the wide-angle lens 6 includes a first lens L61, a second lens L62, a third lens L63, an aperture ST6, a fourth lens L64, a fifth lens L65, a sixth lens L66, a seventh lens L67, a filter OF6, and a protective glass CG6 along an optical axis OA6 from an object side to an image side. When imaging, the light from the object side is finally imaged on an imaging surface IMA6. According to paragraphs 5 to 12 of [Implementation Method], the third lens L63 is a biconvex lens, whose image side surface S66 is convex, and whose object side surface S65 and image side surface S66 are both spherical surfaces; the object side surface S616 and image side surface S617 of the filter OF6 are both planes; the object side surface S618 and image side surface S619 of the protective glass CG6 are both planes; by utilizing the above-mentioned lens, aperture ST6 and a design that satisfies at least one of conditions (1) to (10), the wide-angle lens 6 can effectively reduce the total length of the lens, effectively improve the field of view, effectively improve the resolution, and effectively correct aberrations. The wide-angle lens of the present invention can achieve the basic action requirements only if it satisfies condition (7) or conditional formula (8) and the first, fourth, fifth and seventh lenses have negative, positive, negative and positive refractive powers respectively, the object side surface of the first lens is convex and the image side surface is concave, and the image side surface of the sixth lens is concave; or only if it satisfies condition (7) or conditional formula (8) and the first, fourth, fifth and seventh lenses have negative, positive, negative and positive refractive powers respectively. The basic action requirement can be met if the lens has negative or positive refractive power, the image side of the sixth lens is concave, the object side of the seventh lens is convex and the image side is flat; or if only condition (7) or condition (8) is met and at least two lenses between the two lenses with negative refractive power have positive refractive power, and at least one lens from the second to the seventh lens is a biconcave lens, the basic action requirement can be met.

Table 7 is a table of relevant parameters of each lens of the wide-angle lens 6 in Figure 9.

The definition of the aspheric surface concavity z of each lens in Table 7 is the same as the definition of the aspheric surface concavity z of each lens in Table 1 of the fourth embodiment, and will not be elaborated here.

Table 8 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 7.

Table 9 shows the relevant parameter values of the wide-angle lens 6 of the sixth embodiment and the calculated values of the corresponding conditions (1) to (10). It can be seen from Table 9 that the wide-angle lens 6 of the sixth embodiment can meet the requirements of conditions (1) to (10).

In addition, the optical performance of the wide-angle lens 6 of the sixth embodiment can also meet the requirements. As can be seen from Figure 10, the longitudinal aberration of the wide-angle lens 6 of the sixth embodiment is between -0.015mm and -0.005mm. As can be seen from Figure 11, the field curvature of the wide-angle lens 6 of the sixth embodiment is between -0.04mm and 0.01mm. As can be seen from Figure 12, the distortion of the wide-angle lens 6 of the sixth embodiment is between -100% and 0%. It is obvious that the longitudinal aberration, field curvature, and distortion of the wide-angle lens 6 of the sixth embodiment can be effectively corrected, thereby obtaining better optical performance.

Although the present invention has been disclosed as above in the preferred implementation mode, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.

4: Wide-angle lens

L41: First lens

L42: Second lens

L43: Third lens

L44: The fourth lens

L45: Fifth lens

L46: Sixth lens

L47: Seventh lens

ST4: Aperture

OF4: Filter

IMA4: Imaging surface

OA4: Optical axis

S41: Object side of the first lens

S42: Side view of the first lens

S43: Second lens object side

S44: Second lens image side

S45: Third lens object side

S46: Third lens image side

S48: Fourth lens object side

S49: Fourth lens image side

S410: Fifth lens object side

S411: Fifth lens image side

S412: Object side of the sixth lens

S413: Sixth lens image side

S414: seventh lens object side

S415: Side view of the seventh lens

S416: Object side of filter

S417: Filter image side

S47: Aperture surface

Claims (10)

A wide-angle lens comprises: a first lens having negative refractive power and comprising a convex surface facing an object side and a concave surface facing an image side; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power; a fifth lens having negative refractive power; a sixth lens, the sixth lens having refractive power and including a concave surface facing the image side; and a seventh lens, the seventh lens having positive refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from the object side to the image side along an optical axis. A wide-angle lens comprises: a first lens, the first lens having negative refractive power; a second lens, the second lens having refractive power; a third lens, the third lens having refractive power; a fourth lens, the fourth lens having positive refractive power; a fifth lens, the fifth lens having negative refractive power; a sixth lens, the sixth lens having refractive power, and It includes a concave surface facing an image side; and a seventh lens, which has positive refractive power and includes a convex surface facing an object side and a flat surface facing the image side; Wherein, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from the object side to the image side along an optical axis. A wide-angle lens as described in item 1 or 2 of the patent application, wherein: the second lens has positive refractive power; the third lens has positive refractive power; and the sixth lens has positive refractive power. The wide-angle lens as described in item 3 of the patent application, wherein: the first lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side; the second lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side; the third lens includes a convex surface facing the object side; the fourth lens is a double convex lens, and includes a convex surface facing the object side and another convex surface facing the image side; the fifth lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side; the sixth lens is a meniscus lens and further includes a convex surface facing the object side; and the seventh lens is a plano-convex lens and includes a convex surface facing the object side and a flat surface facing the image side. The wide-angle lens as described in Item 4 of the patent application, wherein the third lens further includes another concave surface facing the image side or another convex surface facing the image side. A wide-angle lens as described in item 1 or 2 of the patent application, wherein two lenses with positive refractive power are included between the object side and an aperture. A wide-angle lens as described in item 1 or 2 of the patent application, wherein: the first lens has negative refractive power; the second lens is a meniscus lens with positive refractive power; the third lens has positive refractive power; the fourth lens has positive refractive power; the fifth lens has negative refractive power and includes a concave surface facing the object side and another concave surface facing the image side; the sixth lens has a positive refractive power; the fifth lens has a .... The lens is a meniscus lens with positive refractive power; the seventh lens has positive refractive power; the first lens has opposite refractive power to the second lens; the object side surface of the first lens is similar to the image side surface of the second lens; the first lens has opposite refractive power to the sixth lens; and the image side surface of the first lens is similar to the image side surface of the sixth lens. A wide-angle lens comprises: a first lens, which is a meniscus lens having refractive power; a second lens, which has refractive power and comprises a concave surface facing an object side; a third lens, which has refractive power; a fourth lens, which has refractive power; a fifth lens, which has refractive power; a sixth lens, which has refractive power; and a seventh lens, which has refractive power; wherein at least one of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is a biconcave lens; wherein at least two lenses with positive refractive power are included between two lenses with negative refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from the object side to an image side along an optical axis. The wide-angle lens as described in item 1, item 2, item 7 or item 8 of the patent application, further comprising an aperture disposed between the third lens and the fourth lens, the wide-angle lens meeting at least one of the following conditions: -1mm<fb+Rc<2mm;0.14<Ra/fc<6.62; 3mm ^-1 <Vdb/Rc<7mm ^-1 ; 0.14mm<Ra/Vdb<1.34mm;-2.3<f1/f<-1.5;-38.3<Vdd/(fc/fb)<-15.2;0.14<f/TTL<0.18;3.1<TTL/BFL<8.1;4.5<L/f<6.9;3.4<R11/f<5.5; wherein f is an effective focal length of the wide-angle lens, f1 is an effective focal length of the first lens, fb is an effective focal length of the lens second closest to the aperture between the aperture and an imaging plane, fc is an effective focal length of the lens closest to the imaging plane, TTL is an object side of the first lens to the imaging plane on the optical axis, BFL is a distance from an image side surface of the seventh lens to the imaging plane on the optical axis, L is a distance from the object side surface of the first lens to the image side surface of the lens closest to the imaging plane on the optical axis, Ra is a curvature radius of an object side surface of the lens closest to the aperture between the aperture and the imaging plane, Rc is a curvature radius of an object side surface of the lens closest to the imaging plane, Vdb is an Abbe coefficient of the lens second closest to the aperture between the aperture and the imaging plane, Vdd is an Abbe coefficient of the lens second closest to the imaging plane, and R11 is a curvature radius of the object side surface of the first lens. A wide-angle lens comprises: a first lens, which is a meniscus lens and has a refractive power; a second lens, which has a refractive power; a third lens, which has a refractive power; a fourth lens, which has a refractive power; a fifth lens, which has a refractive power; a sixth lens, which has a refractive power; and a seventh lens, which has a refractive power; wherein at least one of the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is a biconcave lens; wherein at least two lenses with positive refractive power are included between two lenses with negative refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged along an optical axis from an object side to an image side. The wide-angle lens meets at least one of the following conditions: -1mm<fb+Rc<2mm; 0.14mm<Ra/Vdb<1.34mm; 0.14<f/TTL<0.18; 3.4<R11/f<5.5; fb is the effective focal length of the lens closest to the aperture between an aperture and an imaging plane, and Rc is the effective focal length of the lens closest to the imaging plane. A radius of curvature of an object side surface, Ra is a radius of curvature of an object side surface of the lens closest to the aperture between the aperture and the imaging plane, Vdb is an Abbe coefficient of the lens second closest to the aperture between the aperture and the imaging plane, f is an effective focal length of the wide-angle lens, TTL is a distance from an object side surface of the first lens to the imaging plane on the optical axis, and R11 is a radius of curvature of the object side surface of the first lens.

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