Canon Kabushiki Kaisha

Nikon Corporation

Optos Plc

Makoto Fujimoto

Akihiro Nishio

Takeshi Umeda

David Michael Williamson

Issei Tanaka

Takeshi Yamawaki

Katsuya Watanabe

Masahiro Mizuta

Gonzalo Muyo

Azuna Nonaka

Miwako Yoshida

Alistair Gorman

Yasufumi Nishi

Kyoya Tokunaga

David M Williamson

The ophthalmic optical system is configured to apply an angular scanning light ray to an eye. M=|ωout/ωin| is defined, where ωin represents an angle between an incident light ray to the ophthalmic optical system and an optical axis of the ophthalmic optical system, and ωout represents an angle between an exiting light ray exiting from the ophthalmic optical system toward the eye and the optical axis. The ophthalmic optical system satisfies a conditional expression Mpar<Mmax, where Mpar represents M in a case that the incident light ray is a paraxial ray, Mmax represents M in a case that the incident light ray is a ray of a maximum angle of win.

Ophthalmic optical system, ophthalmic objective lens, and ophthalmic device

A zoom lens includes a first lens group having negative refractive power; a second lens group having positive refractive power; a third lens group having negative refractive power and a fourth lens group having positive refractive power. Upon varying magnification, distances between the first lens group and the second lens group, between the second lens group and the third lens group and between the third lens group and the fourth lens group vary. The second lens group includes a front lens group, an aperture stop, and a rear lens group. Each of the front lens group and the rear lens group includes at least one positive lens. At least a part of the lenses in the second lens group is moved as a group to have a component in a direction perpendicular to an optical axis.

Zoom lens, optical apparatus, and method for manufacturing the zoom lens

A zoom lens comprises a first lens group having negative refractive power; a second lens group having positive refractive power; a third lens group having negative refractive power and a fourth lens group having positive refractive power. Upon varying magnification, distances between the first lens group and the second lens group, between the second lens group and the third lens group and between the third lens group and the fourth lens group vary. The second lens group includes a front lens group, an aperture stop, and a rear lens group. Each of the front lens group and the rear lens group includes at least one negative lens. At least a part of the lenses in the second lens group is moved as a group to have a component in a direction perpendicular to an optical axis.

A telephoto lens TL having, in order from an object, a plurality of lenses L, L, . . . and a diffractive optical element DOE which has a diffraction grating having a rotationally symmetric shape with respect to the optical axis, wherein the diffractive optical element DOE is disposed on any one of lens surfaces of the plurality of lenses L, L, . . . , and conditional expression 0.50&#x3c;fa/Rd&#x3c;0.90 or 1.10&#x3c;fa/Rd&#x3c;2.00 is satisfied, where fa denotes a combined focal length of each lens from the lens L, which is closest to the object, of the plurality of lenses L, L, . . . to the lens L, on which the diffractive optical element DOE is disposed, and Rd is a radius of curvature of the lens surface on which the diffractive optical element DOE is disposed.

Optical system, optical apparatus and method for arranging diffractive optical element

An imaging lens, an optical apparatus equipped therewith, and a method for manufacturing the imaging lens are provided. The imaging lens includes a front lens group having negative refractive power disposed to the most object side and a rear lens group having negative refractive power, disposed to an image side of the front lens group and moving at least a portion thereof in a direction including a component substantially perpendicular to an optical axis. The rear lens group includes Ghaving negative refractive power, Ghaving negative refractive power, and Ghaving positive refractive power. Gis disposed between Gand G. Gside lens surface of Gis a concave surface facing G. Gis a negative meniscus lens shape having a concave surface facing G. At least one lens surface among optical surfaces of G, Gand Gis an aspherical surface.

Imaging lens, optical apparatus equipped therewith and method for manufacturing imaging lens

An imaging lens, an optical apparatus equipped therewith, and a method for manufacturing the imaging lens are disclosed. An imaging lens consists of, in order from an object, a front group having negative power, and a rear group including a sub-lens group having negative power. At least a portion of the sub-lens group is movable in a direction including a component substantially perpendicular to an optical axis. The sub-lens group includes, in order from the object, a first negative component having negative power, a second negative component having negative power and a positive component having positive power. The shape of an air lens formed by the first negative component and the second negative component is a double convex shape. An antireflection coating is applied on at least one optical surface of the front group, and the antireflection coating including at least one layer formed by use of a wet process.

Imaging lens, optical apparatus equipped therewith, and method for manufacturing imaging lens

An imaging lens SL installed in an SLR camera includes a front group disposed to the most object side and having negative power, and a rear group disposed to an image side of the front group and having negative power. At least a portion of the rear group is movable perpendicularly to an optical axis. The rear group includes a first negative component having negative power, a second negative component having negative power, and a positive component having positive power. The second negative component is disposed between the first negative component and the positive component. The second negative component side surface of the first negative component faces the second negative component, and the second negative component having a negative meniscus shape with a concave surface facing the first negative component. Thereby providing an imaging lens having excellent optical performance, an optical apparatus equipped therewith, and a method for manufacturing thereof.

Imaging lens, optical apparatus equipped therewith and method for manufacturing the imaging lens

At least one exemplary embodiment is directed to a display optical system which includes a first optical system configured to form a magnified image of an image displayed on an image display element, the first optical system including an optical member, a second optical system configured to magnify and guide light of the magnified image from the first optical system to one of an observer or a projection surface, the second optical system including a decentered reflecting surface, and an adjusting mechanism configured to displace the optical member of the first optical system in such a way as to have a component in a direction perpendicular to an optical axis of the first optical system.

Display optical system and image display apparatus including the same

An image display apparatus including a light source unit, a liquid crystal display panel, an illumination optical system leading light from the light source unit to the liquid crystal display panel, and a display optical system leading light from the liquid crystal display panel to an observer. The illumination optical system and the display optical system share an optical surface having dielectric multilayer films and being concave toward the liquid crystal display panel on a plane including a center ray corresponding to an angle of view. The optical surface reflects light from the light source unit for leading the light to the liquid crystal display panel while transmitting light reflected from the liquid crystal display panel. On the plane including the center ray, the brightness of the light-emitting surface of the light source unit is reduced toward the optical surface smaller than that in the remote from the optical surface.

Image display apparatus

Disclosed is a compact zoom lens system having a image stabilizing function. This zoom lens system is provided with a plurality of lens units of which the interval between adjacent ones is changed during zooming. Shake correction is effected by a part of a lens unit of negative optical power of the plurality of lens units. Specifically, the lens unit of negative optical power is comprised of two lens components of negative optical power, and one of these two lens components is moved so as to have a component in a direction perpendicular to an optical axis to thereby change the imaging position of the zoom lens system.

Zoom lens system and image pickup apparatus having the same

A zoom lens system comprising a multiple of lens units with various positive and negative powers that can, in at least one exemplary embodiment, be used to reduce ghost light.

Zoom lens system and image pickup apparatus using the same

An exemplary embodiment is directed to a zoom lens system configured to impart an appropriate refractive power to an image stabilizing lens unit. The zoom lens system can include: a first lens unit; a second lens unit; and a rear lens group. The plurality of lens units constituting the rear lens group can contain a lens component, where the lens component can include: a front lens sub-component; and a rear lens sub-component. Moreover, in at least one further exemplary embodiment at least a part of the front lens sub-component or the rear lens sub-component can be moved.

An optical scanning apparatus includes a laser unit formed by integrating a semiconductor laser and collimator lens, an incident optical system for making a light beam emerging from the laser unit strike an optical deflector while keeping the light beam wider than the width of a deflecting surface of the optical deflector in the main scanning direction, and an imaging optical system for forming the light beam reflected/deflected by the optical deflector into an image on a scanned surface. The laser unit is shifted by a shift adjusting means in a predetermined direction with respect to the optical axis of the incident optical system so as to make an illuminance distribution of scanning lines on the scanned surface become substantially symmetrical about the scanning central axis.

Optical scanning apparatus, image forming apparatus, and methods of performing optical scanning using optical scanning apparatus and image forming apparatus

Growing community of inventors

Tokyo, Japan

Makoto Fujimoto