Olympus Optical Company, Ltd.

Olympus Corporation

Mil-Kin Inc.

Hirofumi Tsuchida

Norihiko Aoki

Toshiyuki Nagaoka

Hideki Nagata

Tohru Nakamura

Minoru Omaki

Keiji Kunishige

Hiroshi Matsuzaki

Mitsuru Namiki

Hirokazu Konishi

Kazuo Kajitani

Shin-ichi Mihara

Kimiaki Yamamoto

Yasuo Nakajoh

Tsutomu Inanobe

Atsujirou Ishii

Kiyofumi Kano

The optical system for a microscope includes an illumination lens group Gand an objective optical system. The objective optical system has an objective lens group G, a first image forming lens group G, and a second image forming lens group G, which are disposed in this order from the object side, and satisfies the following conditional expressions. NA&#xd7;2&#x2264;NA&#x2264;NA&#xd7;15 . . . (1); 0.01&#x2264;NA&#x2264;0.1 . . . (2); and 25&#x2264;M&#x2264;100 . . . (3), where NAdenotes the numerical aperture of the illumination lens group G, NAdenotes the numerical aperture of the objective lens group G, and Mdenotes the image-formation magnification of the objective lens group G

Optical system for microscope, and microscope in which same is used

There is provided an image taking device with removable optical unit, with which it is possible to operate the power supply of the image taking device body without operating a power switch, and operation of the power supply of the image taking device body is made easy. The image taking device with removable optical element is provided with an image taking device body, a lens unit (optical unit) that is removable with respect to the image taking device body, an attachment detection unit for detecting attachment of the lens unit to the image taking device body, and a system controller (control unit) for turning a power supply of the image taking device body on upon detection of attachment of the lens unit to the image taking device body by the attachment detection unit. The system controller is configured to turn off the power supply of the image taking device body in a state where attachment of the lens unit to the image taking device body is not detected by the attachment detection unit.

Image taking device having a detachable optical unit, an attachment and displacement detection unit, and a control unit responsive to attachment and displacement detection

An interchangeable-lens camera including a camera body on which a lens unit is capable to mount. The camera body includes a lens mounting unit which is provided to the camera body and on which the lens unit is capable to mount at least one dummy mounting unit which is provided to the camera body and on which a device is capable to mount under the same lens mounting system as the lens mounting unit, and a processing unit for reading information about the lens unit mounted to the lens mounting unit; and the processing unit for reading information about the device mounted to the dummy mounting unit.

Interchangeable-lens camera

A wide angle lens system comprises at least three lens element cemented together as a single lens unit and an object side part of the lens unit has a negative refractive power and a rear part of the lens unit has a positive refractive power.

Wide angle lens system

An optical system for optical communications is composed of a transparent material having a refractive index distribution formed by changing the molar ratio of metal oxide with valence of 2 or more. The metal oxide with valence of 2 or more includes, for example, Fe O . Using such an optical system for optical communications, optical communication components such as an optical fiber collimator and an optical isolator are composed.

Optical system for optical communications and method of manufacturing the same

An image taking optical unit comprises an image taking optical system including a lens, an image pick-up element mounting substrate on which an image pick-up element chip is mounted, and a frame member for retaining the both. The frame member comprises a lens positioning face and a substrate positioning face, both of which cooperate to align centers of the lens and chip and position them with a suitable distance. The lens positioning face comprises a vertically lens positioning section for determining a vertical lens position and a horizontally lens positioning section for determining a horizontal lens position. The substrate positioning face comprises a vertically substrate positioning section for determining a vertical substrate position and a horizontally substrate positioning section for determining a horizontal substrate position. The vertically substrate positioning section comprises z direction positioning portion against which an upper surface of the substrate is pressed and the horizontally substrate positioning section comprises x and y direction positioning portions against which side faces of the substrate are pressed.

Image taking lens unit with frame member for positioning lens and substrate

The invention relates to a zoom lens system of three-group construction, one lens for each group, which is less susceptible to aberration variations even upon zooming and can achieve entire-length reductions, large lens aperture and high zoom ratio. The zoom lens system comprises, in order from an object side thereof, a first lens group G consisting of one single lens formed of a homogeneous medium and having positive refracting power, a second lens group G consisting of one single lens formed of a homogeneous medium and having negative refracting power, and a third lens group G consisting of one single lens formed of a homogeneous medium and having positive refracting power. For zooming from a wide-angle end to a telephoto end of the zoom lens system, at least the second lens group G moves from the object side toward an image side of the zoom lens system.

Lens group zoom lens system, and display device having phototaking function

The invention relates to a zoom lens system of two-group construction, one lens for each group, which is less susceptible to aberration variations even upon zooming and can be much more increased in terms of lens aperture and zoom ratio. The zoom lens system of two-group construction comprises, in order from an object side thereof, a first lens group G having negative refracting power and a second lens group G having positive refracting power and in which a focal length thereof is varied by moving both the lenses while an optical axis separation therebetween is varied. The first lens group G consists of one concave lens having a strong concave surface directed toward an image plane side of the zoom lens system and formed of a homogeneous medium, and the second lens group G consists of one convex lens formed of a homogeneous medium. A stop S is located between the first lens group G and the second lens group G The first lens group G moves largely from the object side toward an image side of the zoom lens system while the second lens group G moves from the image side toward the object side during zooming from a wide-angle end to a telephoto end of the zoom lens system.

Two-group zoom lens system and display device having phototaking function

A set of lens systems consisting of a plurality of different kinds of lens systems each comprising a radial type gradient index lens element(s), wherein the radial type gradient index lens elements have a common refractive index distribution.

Set of lens system

A lens system comprising, in order from the object side, a first lens unit having a positive refractive power and a second lens unit having a negative refractive power, configured to change a focal length thereof by varying an airspace reserved between the first and second lens units, and suited for use in electronic image pickup apparatus. The first lens unit is composed only of a single homogeneous lens element and the second lens unit is composed of a single radial type gradient index lens element which has a positive power of medium.

Lens system and image pickup apparatus

An optical system comprising a radial type gradient index lens element which has a negative refractive power of medium and a negative refractive power as a whole, and a radial type gradient index lens element which has a negative refractive power of medium and a negative refractive power as a whole; the optical system having favorable imaging performance: and an optical module using the optical system which is suited for stereoscopic photography and automatic focusing.

Optical system and optical module

A gradient index lens component composed of a single radial type gradient index lens element which has planar surfaces on both side and a positive refractive power and comprising an aperture stop which is disposed in the vicinity of an object side surface of the radial gradient index lens element for restricting a light bundle. And an image pickup apparatus composed by integrating the gradient index lens component with an image pickup device.

Gradient index lens component and image pickup apparatus using the

An eyepiece system comprising a single radial type gradient index lens which has a refractive index varying dependently on distances from an optical axis in a radial direction and a negative power. This eyepiece system is composed of a small number of lenses, and has chromatic aberration, curvature of field, spherical aberration, etc. which are corrected favorably.

Eyepiece system

An eyepiece lens comprising a single gradient-index lens having a positive refracting power, or comprising a radial gradient-index lens having a positive refracting power, and a field lens, wherein the following Eqs. are satisfied:

Eyepiece lens

An achromatic lens system which comprises a radial type gradient index lens which has a refractive index varying in a direction perpendicular to an optical axis and a diffraction type lens, and sufficiently corrects the secondary spectrum with a small number of optical elements.

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Kunitachi, Japan

Hirofumi Tsuchida