Sony Corporation

Sony Group Corporation

Takeshi Hatakeyama

Satoshi Nagae

Daisuke Kuroda

Yoshito Iwasawa

Takashi Kato

Kenji Ishida

Masaki Tamura

Ichiro Tsujimura

Motoyuki Otake

Miki Sato

Atsushi Oohata

Naomichi Kikuchi

Sota Miyatani

Kodai Nagamatsu

Masanobu Nonaka

A particle analyzer () includes: a light source that emits excitation light (EL) including light having a wavelength of 400 nm or less; a lens structure () that collects excitation light (EL) at a predetermined position () in a flow path (); a detection unit () that detects light (FL) emitted from a particle as the particle () flowing through the predetermined position is excited by the excitation light (EL); and a processing unit () that processes detection data acquired by the detection unit (). The lens structure () includes a plurality of lenses () arranged along an optical axis of the excitation light (EL); and a lens frame () holding the plurality of lenses (). At least one (G) of the plurality of lenses () is positioned in the lens frame () by abutting on a lens adjacent to the lens.

Particle analyzer, particle analysis method, and optical measurement device

The purpose is to provide a higher-quality three-dimensional image with a downsized optical system that does not need interpupillary adjustment. An ocular optical system according to the present disclosure includes, on an optical path viewed from an observer side, at least: a first polarization member; a mirror; a second polarization member; and an image display device in this order. A polarized state in the first polarization member and a polarized state in the second polarization member are orthogonal to each other.

Ocular optical system, medical viewer, and medical viewer system

An image quality is improved although a medical stereomicroscope optical system and a medical observation apparatus are small and light. An objective optical system and a plurality of imaging optical systems are arranged in an order from an object side to an image side, and the imaging optical system has at least a single aspheric surface. Accordingly, a spherical aberration and a field curvature are improved, and the image quality is improved although the medical stereomicroscope optical system and a medical observation apparatus are small and light.

Medical stereomicroscope optical system and medical observation apparatus

A catadioptric lens system includes: a first lens group including a concave mirror and a convex mirror and having positive refractive power; a second lens group having positive refractive power; and a third lens group having negative refractive power, the first to third lens groups being provided, in order, on a light path of incident light and in a direction of travel of the incident light.

Catadioptric lens system and image pickup unit

A zoom lens includes a fixed first lens group having a positive refracting power, a second lens group having a negative refracting power and movable along an optical axis, a fixed third lens group having a positive refracting power, a fourth lens group having a negative refracting power and movable along the optical axis, and a fixed fifth lens group, disposed in order from the object side to the image side. The following expressions are satisfied:0.5&#x3c;f1/(fw&#xb7;ft)&#x3c;1.8&#x2212;0.4&#x3c;f3/f5&#x3c;0.4where f, fw, ft, fand fare focal lengths of the first lens group, the entire lens system in a wide angle end state, the entire lens system in a telephoto end state, the third lens group and the fifth lens group, respectively.

Zoom lens and image pickup apparatus

A catadioptric lens system includes, in order of light travel: a first lens group that includes a concave mirror and a convex mirror and has a positive refractive power; a second lens group that is positioned on the image side of the concave mirror and has a negative refractive power; and a third lens group that has a positive refractive power, wherein the first lens group has a plurality of lenses on the image side of the concave mirror, and some lenses of the plurality of lenses are formed as a vibration-proof group so as to be movable in a direction perpendicular to an optical axis.

Catadioptric lens system and imaging apparatus

Provided is a zoom lens that has a plurality of lens groups and performs zooming by changing spaces between the plurality of lens groups. A final lens group closest to an image side includes, in order from an object side to an image side: a first partial lens group that has a negative refractive power; a second partial lens group that has a positive refractive power; and a third partial lens group that has a positive refractive power. Image blur is corrected by shifting the second partial lens group in a direction substantially perpendicular to an optical axis. Assuming that a focal length of the first partial lens group is fGF, a focal length of the second partial lens group is fGS, and a focal length of a whole lens system of the lens groups in a telephoto end state is ft, the following expressions are satisfied: &#x2212;0.24&#x3c;fGF/ft&#x3c;&#x2212;0.09; and 0.12&#x3c;fGS/ft&#x3c;0.32.

Zoom lens and imaging apparatus

A catadioptric lens system includes, in order of light travel: a first lens group that includes a concave mirror and a convex mirror and has a positive refractive power; a second lens group that is positioned on the image side of the concave mirror and has a negative refractive power; and a third lens group that has a positive refractive power, wherein a close-range object is brought into focus by moving the second lens group in a direction parallel with the optical axis, and wherein the following conditional expression is satisfied0&#x3c;12&#x2003;&#x2003;(0)

A zoom lens formed of a plurality of lens groups and performing zooming by changing separations between predetermined lens groups. A lens group closest to an object side is fixed in both optical axis directions during zooming, and has a reflecting member for folding an optical axis approximately 90 degrees. A final lens group positioned closest to an image side and fixed in both optical axis directions during zooming has a lens part group SG having positive refractive power and a lens part group RG arranged adjacent to the image side of the lens part group SG and having negative refractive power. A blur is corrected by shifting the lens part group SG in either direction perpendicular to the optical axis.

Zoom lens, image capture apparatus, and method for controlling zoom lens

An object is to reduce the effect of defocusing due to the movement of an image plane when a shifting lens group movable in a direction perpendicular to the optical axis for correcting hand jiggling is positionally deviated along the optical axis, thereby maintaining high optical performance at the time of correcting hand jiggling. A zoom lensincludes a plurality of lens groups with distances between the lens groups being changed for variable power. A final lens group Lwhich is positioned most closely to an image side has a sub lens group GS (G) having a positive refractive power and a sub lens group GR (G) disposed adjacent to the sub lens group GS (G) on the image side and having a positive refractive power. The sub lens group GS is shiftable in a direction perpendicular to the optical axis for correcting image blurs. The sub lens group GS has a lateral magnification &#x3b2;s and the sub lens group GR has a lateral magnification &#x3b2;R, the lateral magnifications satisfying the following conditional expressions (), ():&#x3b2;s&#x3c;1&#x2003;&#x2003;(1)0&#x3c;&#x3b2;R&#x3c;1&#x2003;&#x2003;(2)

Zoom lens and imaging capturing device

An image pickup apparatus includes a zoom lens including at least two movable lens groups; an image pickup element that converts an optical image formed with the zoom lens into an electric signal; and an image processor that electrically corrects a lateral chromatic aberration to be generated at the zoom lens. The zoom lens satisfies Conditional Expressions (1) and (2) as follows,&#x2212;5.0&#x3c;_ate()/_ate()&#x3c;&#x2212;0.2&#x2003;&#x2003;(1)0.003&#x3c;|Max_ate(10)/Himg |&#x3c;0.03&#x2003;&#x2003;(2)where W_ate(X) is an aberration amount of the lateral chromatic aberration from the C-line to the g-line, at a wide-angle end, corresponding to a (X&#xd7;10) % image height, T_ate(X) is an aberration amount of the lateral chromatic aberration from the C-line to the g-line, at a telephoto end, corresponding to a (X&#xd7;10) % image height, Max_ate(X) is one of W_ate(10) and T_ate(10), the one having a larger absolute value, and Himg is a diagonal length of the image pickup element.

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Chiba, Japan

Takeshi Hatakeyama