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Inventor:
Kitagishi; Nozomu
Address:
Tokyo, JP
No. of patents:
31
Patents:












Patent Number Title Of Patent Date Issued
7038722 Optical imaging system for suppressing the generation of red-toned ghosting particularly when th May 2, 2006
An optical imaging system suppresses the generation of red-toned ghosting in an image particularly when there is a background light or when a strong light source shines on the screen. The optical imaging system has a reflection-type infrared cut filter comprising a multi-layer film,
5303087 Retrofocus type lens April 12, 1994
A retrofocus type lens having a plurality of lenses divided into three lens units, or, in the order from a screen, a first lens unit, a second lens unit and a third lens unit, wherein letting the focal length of the entire lens system be denoted by fT, and the distance from a lens surfac
5270857 Optical system for stabilizing an image December 14, 1993
An image stabilizing system includes a photographic lens device having a plurality of lens units, wherein for zooming at least one lens unit separation varies, a detecting circuit for detecting the jiggle of the system, and a drive device for driving at least one lens unit in a direc
5253005 Small-sized camera October 12, 1993
A small-sized camera in which while the light emerging from a photographic lens having an optical axis parallel with a photosensitive plane is conducted by first and second mirrors to the photosensitive plane to form a photographic system, the first or second mirror is turned around a
5182671 Variable magnification optical system having a capability of stabilizing the image January 26, 1993
An image stabilization optical system for use in the variable magnification optical system having a first lens group followed rearwardly by a zoom section comprising a plurality of lens groups is disclosed, wherein as at least one lens group in the zoom section is made to be a compensati
5124839 Phase-type focusing screen June 23, 1992
A focusing screen has a base plate with a planar surface. A plurality of unit regions are arrayed with a periodicity on the base plate planar surface. Each of the unit regions comprises (1) a first plurality of convex portions or concave portions having planar surfaces substantially
5089835 Phase-type diffusing plate February 18, 1992
A focusing screen suited to be used in the camera, having three plane portions of different heights in each of small areas, wherein the plane portion A, the plane portion B and the plane portion C are arranged in the order from the lowest height, and letting the height of the plane porti
5069537 Image deflecting device December 3, 1991
In an optical system comprising a plurality of lens units, one of which is used as a compensation lens unit capable of decentering to compensate for the image blur, an image magnification .beta.c of the compensation lens unit satisfies the following condition:
5054898 Compact high-range varifocal objectives October 8, 1991
A zoom lens comprising a plurality of lens units in which at least one of the air separations between the units is varied to effect zooming, whereby at least one of the plurality of lens units is included with at least one refractive index distribution type lens element on a common optic
5011272 Compact zoom lens April 30, 1991
A zoom lens including at least two lens units of which the front one is of positive refractive power and the rear one is of negative refractive power, the units being axially movable to decrease their separation in zooming from the wide angle to the telephoto end. At least one of the len
4974950 Optical system for deflecting image December 4, 1990
An optical system comprising, from front to rear, a first lens group of positive power, a second lens group of negative power and a third lens group of positive power, wherein deflection of an image is made by parallel decentering the second lens group.
4974947 Refractive index distribution type meniscus lens and optics December 4, 1990
A refractive index distribution type meniscus-shaped single lens characterized in that it has a refractive index distribution in which the refractive index decreases along the optic axis thereof from a convex surface to a concave surface and the difference .DELTA.N in refractive inde
4949107 Camera having telescopic capability August 14, 1990
A camera having a photographic lens and an eyepiece lens for observing an image formed by the photographic lens, wherein when this camera is used as a telescope, the interval between the image and the eyepiece lens is shortened, while simultaneously changing the focal length of the eyepi
4907866 Objective of variable focal length March 13, 1990
An objective of variable focal length includes a plurality of lens units of which the first, counting from front, is of negative power and the second is of positive power. At least the first and second lens units are moved with variation of the air separation therebetween to vary the foc
4865434 Zoom lens capable of selecting a focal length beyond a standard focal length range September 12, 1989
A zoom lens including, from front to rear, a first lens unit of positive power, a second lens unit of negative power and a third lens unit of positive power, wherein for a standard focal length range at least the first and second lens units move simultaneously and independently of each
4859040 Optical system having gradient-index lens and method for correcting aberrations August 22, 1989
An optical system comprising a plurality of lens components, wherein at least one of the components is a convex lens and has a radial gradient of refractive index in such a cross section that the refractive index increases toward the margin, so that it behaves as a lens of negative p
4844602 Optical system for deflecting image July 4, 1989
In the stabilized optical system against vibratory motions, a front lens unit restrained from movement in a direction perpendicular to the optical axis is followed rearwardly by a movable lens unit for decentering away from the optical axis to compensate for the image shift resulting fro
4842395 Finder of variable magnification June 27, 1989
The disclosed variable magnification finder includes, from front to rear, a first lens unit of negative power, a second lens unit of positive power, a third lens unit of positive power, the first, second and third lens units constituting an objective lens of positive power, and an eyepie
4842386 Variable focal length objective June 27, 1989
A variable focal length objective having a plurality of lens units with at least one unit separation being varied to vary the focal length of the entire system, in which at least one of the plurality of lens units has at least gradient-index lens having a refractive index distribution of
4830477 Zoom lens capable of obtaining focal lengths beyond a variable focal length range May 16, 1989
A zoom lens comprising, from front to rear, a first zoom section and a second zoom section, the first zoom section having a plurality of movable lens units which simultaneously move to effect zooming, and the second zoom section having a plurality of axially movable lens units, the light
4781446 Zoom lens having a capability of introducing special features into image formats November 1, 1988
A zoom lens having a plurality of lens units with the air separations, at least one of which is varied to effect zooming, the rearmost lens surface of successive two of the lens units and the frontmost lens surface of the rear one being both formed to convex shapes toward the front, wher
4776679 Objective of variable focal length October 11, 1988
A variable focal length objective of which at least one of a pulrality of lens units is moved to vary the image magnification, wherein at least one of the plurality of lens units has at least one refractive index distribution type lens provided with a condition of N.sub.1 >0 as, takin
4752121 Zoom lens June 21, 1988
A zoom lens having at least three components, or, from front to rear, a first component of positive refractive power, a second component for variation of the image magnification, and a third component for image shift compensation, wherein said first lens component is constructed from
4711534 Zoom lens able to obtain focal lengths beyond the zooming range December 8, 1987
A zoom lens including, from front to rear, a first lens unit of negative power and a second lens unit of positive power with the separation therebetween being varied to effect zooming. The first lens unit is moved to effect focusing, wherein with the first lens unit focusing a finite
4695133 High range zoom lens September 22, 1987
The disclosed zoom lens includes, from front to rear, a first lens unit of positive power, a second lens unit of negative power, a third lens unit of positive power, and a fourth lens unit. When zooming, the first and third lens units are axially moved independently of each other, the se
4666257 Compact zoom lens May 19, 1987
A compact zoom lens including, from front to rear, a first lens unit of positive power, a second lens unit of negative power, a third lens unit of positive power and, if desired, further a fourth lens unit, with the separations between the first and second units, between the second and
4659189 Zoom lens of reduced total length April 21, 1987
In the disclosed zoom lens, a zoom section includes a number of lens units with at least one of the axial spacings between two successive lens units being variable for zooming, and an image forming section of positive power behind the zoom section includes a front lens unit of positive p
4639096 High range zoom lens January 27, 1987
The disclosed zoom lens is composed of four lens groups. Counting from the front, the first lens group has a positive power, the second a negative power, the third a positive power and the fourth a positive or a negative power. At least the first, third and fourth lens groups are movable
4629294 Zoom lens December 16, 1986
A zoom lens includes, from front to rear, a positive first component, a negative second component, a positive third component and a positive or negative fourth component. The first, third and fourth components are movable to vary the focal length of the entire system. In the wide angle
4571033 Zoom lens February 18, 1986
A zoom lens comprising, from front to rear, a positive first lens component, a negative second lens component, a positive third lens component and an image forming or fourth lens component, wherein as zooming occurs from the wide angle to the telephoto position, the first and third l
4536073 Apparatus for detecting a condition of sharpest focus August 20, 1985
A real image of an object is projected by an objective lens to at least a pair of photosensitive elements on opposite side of a prescribed focal plane, wherein use is made of a secondary image forming lens between the objective lens and the pair of photosensitive elements to achieve a gr










 
 
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