Imaging lens and image pickup apparatus

Abstract

The invention provides an imaging lens that has a small F number and a small size while maintaining a good optical performance. The imaging lens comprises, in order from an object side: a first lens that has a negative refractive power and is convex toward the object side; a second lens that has a positive refractive power and is a meniscus lens convex toward the object side; a stop; a third lens that has a positive refractive power and is convex toward an image side; and a cemented lens that has a positive refractive power as a whole and is formed by cementing a fourth lens and a fifth lens, wherein assuming that an Abbe number of the second lens with respect to d-line is nu2, a distance on an optical axis from a vertex of a surface of the first lens facing toward the object side to an image plane of the imaging lens is L, a focal length of the imaging lens is f, and a back focus of the imaging lens is Bf, the following conditional expressions (1) to (3) are satisfied: nu2>30 (1), 2.5 G02B 13 / 00 G02B 9 / 34 H04N 5 / 225 8 18 3 2008 / 8 / 15 101373260 2009 / 2 / 25 000000000 Fujinon Corp. Japan Asami Taro li xianglan 11021 The Patent Agency of the Chinese Academy of Sciences Inside the Chinese Academy of Sciences, No.52 Sanlihe Road, Fuwai, Beijing 100864 Japan 2007 / 8 / 21 2007-214271

Description

technical field

[0001] The present invention relates to an imaging lens and an imaging device. Specifically, it relates to a vehicle-mounted camera, a mobile terminal camera, a monitoring camera, and the like that use an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). A used imaging lens and an imaging device including the imaging lens. Background technique

[0002] In recent years, the miniaturization and high pixelation of imaging elements such as CCDs and CMOSs ​​have rapidly progressed. At the same time, the miniaturization of the main body of the imaging device including these imaging elements is also progressing, and the size and weight of the imaging lens mounted on the main body of the imaging device are also required to be reduced in size and weight.

[0003] In addition, in-vehicle cameras and surveillance cameras, small and high-performance lenses that can be used in a wide temperature range while requiri...

Examples

Embodiment 1

[0094] Table 1 shows lens data of the imaging lens according to Example 1. FIG. In addition, in Table 1, various data are shown together below the lens data. In the lens data in Table 1, the surface number indicates the i-th (i=1, 2, 3...) surface number that increases sequentially toward the image side with the surface of the most object-side component being the first. . In addition, the lens data in Table 1 are given so as to include the aperture stop St as well.

[0095] Ri in Table 1 represents the radius of curvature of the i-th (i=1, 2, 3, ...) surface, and Di represents the distance between the i-th (i=1, 2, 3, ...) surface and the i+1-th surface Face spacing on axis Z. In addition, Ndj represents the refractive index of the j-th (j=1, 2, 3, ...) optical element with respect to the d-line, with the optical element closest to the object side being the first and increasing sequentially toward the image side, vdj represents the Abbe number of the j-th optical element w...

Embodiment 2

[0103] The lens data and various data of the imaging lens related to Example 2 are shown in Table 2, and the lens configuration diagram is shown in image 3 . exist image 3 , symbols Ri and Di correspond to Ri and Di in Table 2.

[0104] 【Table 2】

[0105]

[0106] face number Ri Di Ndj v dj 1 7.36 1.50 1.7725 49.6 2 3.71 1.02 3 13.57 3.26 1.7550 52.3 4 25.36 2.39 5 (aperture aperture) ∞ 1.28 6 -10.83 2.10 1.8348 42.7 7 5.92 0.10 8 13.15 3.91 1.7725 49.6 9 -6.30 0.81 1.8467 23.8 10 ∞ 9.40 11 (image plane) ∞

[0107] Fno.=2.00, ω=29.3, L=25.8, f=8.5, Bf=9.40

Embodiment 3

[0109] The lens data and various data of the imaging lens related to Example 3 are shown in Table 3, and the lens configuration diagram is shown in Figure 4 . exist Figure 4 , symbols Ri and Di correspond to Ri and Di in Table 3.

[0110] 【table 3】

[0111]

[0112] face number Ri Di Ndj v dj 1 8.59 1.20 1.7725 49.6 2 4.42 3.73 3 9.96 3.98 1.8348 42.7 4 11.31 1.50 5 (aperture aperture) ∞ 0.94 6 -11.23 2.72 1.8348 42.7 7 7.10 0.10 8 11.24 4.01 1.7130 53.9 9 -8.39 0.80 1.9229 18.9 10...

technical field

[0001] The present invention relates to an imaging lens and an imaging device. Specifically, it relates to a vehicle-mounted camera, a mobile terminal camera, a monitoring camera, and the like that use an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). A used imaging lens and an imaging device including the imaging lens. Background technique

[0002] In recent years, the miniaturization and high pixelation of imaging elements such as CCDs and CMOSs ​​have rapidly progressed. At the same time, the miniaturization of the main body of the imaging device including these imaging elements is also progressing, and the size and weight of the imaging lens mounted on the main body of the imaging device are also required to be reduced in size and weight.

[0003] In addition, in-vehicle cameras and surveillance cameras, small and high-performance lenses that can be used in a wide temperature range while requiri...

Examples

Embodiment 1

[0094] Table 1 shows lens data of the imaging lens according to Example 1. FIG. In addition, in Table 1, various data are shown together below the lens data. In the lens data in Table 1, the surface number indicates the i-th (i=1, 2, 3...) surface number that increases sequentially toward the image side with the surface of the most object-side component being the first. . In addition, the lens data in Table 1 are given so as to include the aperture stop St as well.

[0095] Ri in Table 1 represents the radius of curvature of the i-th (i=1, 2, 3, ...) surface, and Di represents the distance between the i-th (i=1, 2, 3, ...) surface and the i+1-th surface Face spacing on axis Z. In addition, Ndj represents the refractive index of the j-th (j=1, 2, 3, ...) optical element with respect to the d-line, with the optical element closest to the object side being the first and increasing sequentially toward the image side, vdj represents the Abbe number of the j-th optical element w...

Embodiment 2

[0103] The lens data and various data of the imaging lens related to Example 2 are shown in Table 2, and the lens configuration diagram is shown in image 3 . exist image 3 , symbols Ri and Di correspond to Ri and Di in Table 2.

[0104] 【Table 2】

[0105]

[0106] face number Ri Di Ndj v dj 1 7.36 1.50 1.7725 49.6 2 3.71 1.02 3 13.57 3.26 1.7550 52.3 4 25.36 2.39 5 (aperture aperture) ∞ 1.28 6 -10.83 2.10 1.8348 42.7 7 5.92 0.10 8 13.15 3.91 1.7725 49.6 9 -6.30 0.81 1.8467 23.8 10 ∞ 9.40 11 (image plane) ∞

[0107] Fno.=2.00, ω=29.3, L=25.8, f=8.5, Bf=9.40

Embodiment 3

[0109] The lens data and various data of the imaging lens related to Example 3 are shown in Table 3, and the lens configuration diagram is shown in Figure 4 . exist Figure 4 , symbols Ri and Di correspond to Ri and Di in Table 3.

[0110] 【table 3】

[0111]

[0112] face number Ri Di Ndj v dj 1 8.59 1.20 1.7725 49.6 2 4.42 3.73 3 9.96 3.98 1.8348 42.7 4 11.31 1.50 5 (aperture aperture) ∞ 0.94 6 -11.23 2.72 1.8348 42.7 7 7.10 0.10 8 11.24 4.01 1.7130 53.9 9 -8.39 0.80 1.9229 18.9 10...

Images