Fujifilm Corporation

Fujinon Corporation

Nanchang O-film Optical-electronic Tech Co., Ltd.

Tianjin Ofilm Opto Electronics Co., Ltd.

Taro Asami

Ryoko Otomo

Toshiaki Katsuma

Masato Kondo

Toru Ito

Kazuyoshi Okada

Toshihiro Aoi

Takashi Suzuki

Takeshi Kamiya

Yu Kitahara

Koichi Tanaka

Masaru Amano

Masao Mori

Shinichi Shimotsu

Yoko Yamamoto

Provided is a lens device provided in an imaging apparatus body including an image sensor, the lens device including a processor, a a memory coupled to or integrated with the processor, a lens that includes a movement lens and that images incident light on the image sensor, and a drive mechanism that moves the movement lens by applying power to the movement lens along a coordinate plane intersecting an optical axis of the lens. The processor is configured to perform, with respect to the drive mechanism, control of changing a movement amount of the movement lens based on a wavelength range of the light transmitted through the movement lens.

Lens device, imaging apparatus, operation method of lens device, operation method of imaging apparatus, and program

A variable magnification optical system consists of, in order from an object side to an image side, a first lens group, a second lens group, and a subsequent lens group. The variable magnification optical system satisfies a predetermined conditional expression for a partial dispersion ratio related to F line, C line, and a wavelength of 1970.09 nm, a d-line back focus of the variable magnification optical system at a telephoto end, a back focus in any one wavelength from a wavelength of 1300 nm to a wavelength of 2325.42 nm at the telephoto end, and a d-line focal length of the variable magnification optical system at the telephoto end.

Variable magnification optical system and imaging apparatus

The imaging lens includes only eight lenses consisting of, in order from an object side, a negative first lens, a negative second lens, a positive third lens convex toward an image side, a positive fourth lens convex toward an object side, a negative fifth lens, a positive sixth lens convex toward the image side, a positive seventh lens convex toward the object side, and a negative eighth lens, as lenses having refractive powers, in which predetermined conditional expressions are satisfied.

Imaging lens and imaging apparatus

The imaging lens consists of, in order from an object side, a positive first lens group and a positive second lens group. During focusing, the first lens group does not move and the second lens group moves. First and second lenses from an object side in the first lens group are a negative lens. The second lens group consists of a stop disposed on the most object side, two negative lenses, and three or four positive lenses. A lens on the most object side of the second lens group is a negative lens. A lens on the most image side of the second lens group is a positive lens. Predetermined conditional expressions are satisfied.

The imaging lens consists of, in order from an object side, a first lens group, a stop, and a positive second lens group. The second lens group has a negative lens on a side closest to an object and has a single lens or a cemented lens having a positive refractive power on a side closest to an image. Predetermined conditional expressions relating to a back focus, an incidence angle of a principal light ray on the image plane, a maximum image height, a distance from a lens surface on the side closest to the object to a lens surface on the side closest to the image, a distance from an object side principal point of the second lens group to a stop, and a focal length of the second lens group are satisfied.

The imaging lens includes at least one positive lens that satisfies predetermined conditional expressions (1) to (3) indicating conditions in which dispersion is relatively low and refractive index is high while having a negative rate of change of the refractive index. In a case where a lens that satisfies a conditional expression (4) meaning a low dispersion material is included, the lens that satisfies the conditional expression (4) satisfies a predetermined conditional expression (5).

Imaging lens and optical apparatus

Disclosed are an imaging lens having satisfactory performance in a region of near infrared light, and an imaging apparatus including the imaging lens. The imaging lens includes, in order from an object side, as lenses having refractive power, only four lenses including a positive first lens L, a negative second lens L, a positive third lens L, and a positive fourth lens L. A conditional expression relating to a focal length fs1 of the first lens Lwith respect to s-line and a focal length fs of the entire system with respect to s-line: 0.5&#x3c;fs1/fs&#x3c;2.5 is satisfied.

The imaging lens consists of, in order from an object side, a positive first lens L, a negative second lens L, a positive third lens L, and a positive fourth lens L. Conditional expressions relating to a focal length f of an entire system, a combined focal length f234 of the second lens Lto the fourth lens L, an Abbe number &#x3bd;d1 of the first lens L, an Abbe number &#x3bd;d2 of the second lens L, a radius of curvature R1 of a surface of the first lens Lon the object side, and a radius of curvature R2 of a surface of the first lens Lon an image side: 0.4&#x3c;f/f234&#x3c;2; &#x3bd;d1&#x3c;50; 5&#x3c;&#x3bd;d1&#x2212;&#x3bd;d2&#x3c;26; &#x2212;5&#x3c;(R1+R2)/(R1&#x2212;R2)&#x3c;&#x2212;0.9 are satisfied.

Disclosed is an imaging lens substantially consisting of a first lens group having a positive refractive power and a second lens group having a positive refractive power, arranged in this order from the object side. Focusing is performed by moving the entire second lens group along the optical axis. The most-image-side lens of the first lens group, a lens which is second from a most-image side in the first lens group, and a lens which is third from the most-image side in the first lens group are all meniscus lenses with convex surfaces toward the image side. The imaging lens satisfies the formula: 1.0&#x3c;FA/FB&#x3c;8.0, where FA is the focal length of the first lens group, and FB is the focal length of the second lens group.

An imaging lens consists of five lenses of, in order from the object side, a negative first lens, a positive second lens, a negative third lens, a positive fourth lens, and a positive fifth lens. The following conditional expressions are satisfied:3&#x3c;1.75&#x2003;&#x2003;(1);&#x3bd;3&#x3c;27&#x2003;&#x2003;(2);0.0&#x2266;(3+4)/(3&#x2212;4)&#x2003;&#x2003;(4); and12/&#x3c;1.5&#x2003;&#x2003;(5), where

An imaging lens consists of, in order from the object side, a negative first lens, a positive second lens, a positive third lens, a negative fourth lens, a positive fifth lens, and a positive sixth lens. The imaging lens satisfies the condition expressions below:1/&#x3c;&#x2212;1.68&#x2003;&#x2003;(1-2),&#x2212;0.7&#x3c;4/&#x2003;&#x2003;(2),&#x2212;0.6&#x3c;(3+4)/(3&#x2212;4)&#x3c;2.2&#x2003;&#x2003;(11-2), and0.5&#x3c;2/3&#x3c;4.0&#x2003;&#x2003;(12),where f1 to f4 are focal lengths of the first to the fourth lenses, f is a focal length of the entire system, R3 is a radius of curvature of the object-side surface of the second lens, and R4 is a radius of curvature of the image-side surface of the second lens.

An imaging lens substantially consists of six lenses, composed of a negative first lens, a positive second lens, a negative third lens, a positive fourth lens, a positive fifth lens, and a negative sixth lens, disposed in order from the object side, and satisfies, when the distance between the first lens and the second lens is taken as Db12, the center thickness of the second lens is taken as D3, the focal length of the second lens is taken as f2, the focal length of the entire system is taken as f, the paraxial radius of curvature of the object side surface of the first lens is taken as R1f, and the paraxial radius of curvature of the image side surface of the first lens is taken as R1r, conditional expressions given below:1.0&#x3c;(12+3)/&#x2003;&#x2003;(1)2/&#x3c;1.68&#x2003;&#x2003;(2)1.1&#x3c;(11)/(11)&#x3c;2.2&#x2003;&#x2003;(3-3)

An imaging lens consists of a negative first lens, a positive second lens, a negative third lens, a positive fourth lens, a positive fifth lens, and a negative sixth lens in order from the object side. The Abbe number of the material of the sixth lens with respect to the d-line is less than or equal to 30. When the radius of curvature of the object side surface of the third lens is taken as RF, the radius of curvature of the image side surface of the third lens is taken as RR, and the Abbe number of the material of the third lens with respect to the d-line is taken as &#x3bd;d, the following conditional expressions are satisfied:1.35&#x3c;(33)/(33)&#x3c;6.0&#x2003;&#x2003;(1)&#x3bd;3&#x3c;30.0&#x2003;&#x2003;(2).

An imaging lens consists of, in order from the object side, a negative first lens, a positive second lens, a positive third lens, a negative fourth lens, a positive fifth lens, a positive sixth lens, and a negative seventh lens. When f12 is the combined focal length of the first lens and the second lens, f is the focal length of the entire system, &#x3bd;d7 and &#x3bd;d3 are respectively the Abbe's numbers of the materials of the seventh lens and the third lens with respect to the d line, the following conditional formulae are satisfied:12/&#x3c;&#x2212;3.2&#x2003;&#x2003;(1)&#x3bd;d7&#x3c;55&#x2003;&#x2003;(2)40&#x3c;&#x3bd;d3&#x2003;&#x2003;(3).

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Saitama, Japan

Taro Asami