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| Number | Title | Issue Date |
| 6320702 | Afocal zoom lens, and microscope having the lens An afocal zoom lens comprising, in order from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power and a fourth lens group havi... | 11/20/2001 |
| 6320698 | Zoom lens with vibration reduction function A zoom lens includes in the following order from the object side, a first lens group having a negative refracting power, a second lens group having a positive refracting power, a third lens group having a negative refracting power, and a fourth lens group... | 11/20/2001 |
| 6317270 | Optical system A zoom optical system provides a series of lens units designed to allow for zooming with minimal change in aberration resulting from the movement of the lens units. Each lens unit has a plurality of lens units. One embodiment has, in order from the object... | 11/13/2001 |
| 6317271 | Zoom lens system A zoom lens system according to the present invention includes a negative first lens group, a positive second lens group, a negative third lens group and a positive fourth lens group, in this order from the object. The zoom lens system satisfies the follo... | 11/13/2001 |
| 6307683 | Zoom lens A zoom lens for television broadcasting cameras suitable for both regular and high definition television (HDTV) format cameras is disclosed. The zoom lens is formed of a zoom lens main body having four lens groups and a supportive lens attachment that may... | 10/23/2001 |
| 6297912 | Zoom lens having low-pass phase filter, lens system having low-pass phase filter, and camera having the same zoom lens or lens system A lens system having a magnification changing function comprises a plurality of lens units, an aperture diaphragm, and a low-pass phase filter. At least one lens unit contributing to the magnification changing function is disposed on the image side of the... | 10/02/2001 |
| 6278559 | Zoom lens for television camera A zoom lens having only five lens groups of positive, negative, negative, positive and positive refractive power, respectively, in order from the object side. The focal distance is varied by shifting the second and third lens groups, in order from the obj... | 08/21/2001 |
| 6266189 | Zoom lens system having an image blur compensating function A zoom lens system has the first to fifth lens units from the object side. Refractive powers of the first to fifth lens units are positive, negative, negative, positive, negative, respectively. During zooming, the distances between the lens units are vari... | 07/24/2001 |
| 6266195 | Zoom lens A simple-structured zoom lens having four lens groups is disclosed wherein the zoom lens does not require refocusing after a zooming operation even when the wavelength of light being imaged is different from the design wavelength. The zoom lens includes, ... | 07/24/2001 |
| 6256144 | Real image mode variable magnification finder A real image mode variable magnification finder has an objective optical system with positive refracting power, an image erecting optical system, and an ocular optical system with positive refracting power. The objective optical system has a first lens un... | 07/03/2001 |
| 6252723 | Objective optical system An objective optical system comprising, in order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power and a third lens unit having a positive refractive power, wherein the second... | 06/26/2001 |
| 6246833 | Photographic lens and photographing apparatus having the same A photographic lens includes, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of negative... | 06/12/2001 |
| 6236522 | Photographic optical system A photographic optical system greatly improved in chromatic aberration and capable of providing high image quality with a compact, lightweight and low-cost arrangement having a minimal number of constituent elements. The optical system has a negative lens... | 05/22/2001 |
| 6236515 | Zoom lens system A zoom lens system has the first and second lens units. During zooming from a wide-angle end to a telephoto end, the lens units are moved to decrease a distance therebetween. The first lens unit has a positive refractive power. The second lens unit has a ... | 05/22/2001 |
| 6233099 | Zoom lens and optical apparatus having the same A zoom lens of the negative lead type includes, in order from the object side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, a third lens unit of negative refractive power consisting of one negative lens,... | 05/15/2001 |
| 6229655 | Zoom lens system A zoom lens system has, from the object side, a first lens unit, a second lens unit and a third lens unit. The first lens unit has a negative optical power as a whole. The second and third lens units have a positive optical power as a whole. In the zoom l... | 05/08/2001 |
| 6229653 | Variable-power eyepiece optical system A variable-power eyepiece optical system, which is used in combination with an objective optical system, includes a negative first lens group, a second lens group having a positive first sub lens group and a positive second sub lens group, and a positive ... | 05/08/2001 |
| 6219190 | Zoom lens A zoom lens is composed of a plurality of lens units. The plurality of lens units includes a movable lens unit having a negative refractive power lying closest to an image side. The movable lens unit has, in order from an object side, a first diffractive ... | 04/17/2001 |
| 6215600 | Zoom lens A zoom lens which includes, in order from an object side, a first lens unit of positive refractive power, a second lens unit of positive refractive power and a third lens unit of negative refractive power, wherein the first, second and third lens units ar... | 04/10/2001 |
| 6204976 | Zoom lens A zoom lens having a maximum of thirteen lens elements in four lens groups, the four lens groups being of negative, positive, positive, and positive refractive power, in order from the object side. The first lens group G1 and the fourth lens gr... | 03/20/2001 |
| 6191895 | Zoom lens system A zoom lens system has, from the object side, a first lens unit having a optical power, a second lens unit having a negative optical power a third lens unit having a positive optical power, and a succeeding lens unit. The first and the third lens units mo... | 02/20/2001 |
| 6175453 | Zoom lens An improved zoom lens constitutes a plurality of lens groups of different focal length. Through adjusting the position of the lens groups, different zooming ratio may be obtained. Higher image resolution and lower cost may also be achieved through using d... | 01/16/2001 |
| 6166864 | Zoom lens and optical apparatus using the same A zoom lens includes, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens unit of positive refract... | 12/26/2000 |
| 6163410 | Optical system A zoom optical system is disclosed. The zoom optical system provides a series of lens units designed to allow for zooming with minimal change in aberration resulting from the movement of the lens units. To achieve this goal each lens unit is has a plurali... | 12/19/2000 |
| 6160669 | Lens system A lens system composed of a first lens unit, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. The lens system is composed of a small num... | 12/12/2000 |
| 6157494 | Zoom lens system using a diffractive optical element and image pickup device using the same The invention provides a high-performance zoom lens system which is well corrected for chromatic aberrations by use of a DOE, makes the angle of incidence of a ray bundle on a diffractive surface as small as possible from a wide-angle side to a telephoto ... | 12/05/2000 |
| 6157495 | Afocal zoom lens system for stereoscopic microscopes An afocal zoom lens system comprising a first positive lens unit, a second negative lens unit, a third positive lens unit and a fourth negative lens unit, wherein the first lens unit and the fourth lens unit are kept stationary, the second lens unit is mo... | 12/05/2000 |
| 6141156 | Antivibration zoom lens An antivibration zoom lens (10) for photography, video and the like. The zoom lens has an antivibration function and is capable of forming an image of an object over a zooming range from a maximum wide-angle state to a maximum telephoto state. The zoom le... | 10/31/2000 |
| 6141157 | Zoom lens A zoom lens has, in succession from the object side, a first lens unit of positive refractive power fixed during focal length change, a second lens unit of negative refractive power for focal length change, a third lens unit of negative refractive power f... | 10/31/2000 |
| 6137638 | Projection zoom lens system and projector apparatus A projection zoom lens system of the present invention having telecentric incident side is suitable for a projector apparatus using LCD or DMD with prism. The projection zoom lens system of this invention comprises five lens groups having, from the screen... | 10/24/2000 |
| 6128140 | Zoom lens system A zoom lens system which includes a positive first lens group, a negative second lens group, a positive third lens group, and a positive fourth lens group. All of the lens groups move toward the object upon zooming from the short focal length extremity to... | 10/03/2000 |
| 6124982 | Zoom lens This specification discloses a zoom lens which has, in succession from the object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power for focal length change, a third lens unit for correcting the changing ... | 09/26/2000 |
| 6118592 | Zoom lens system A zoom lens system has four or five lens units with the optical powers being +/-/+/- or +/-/+/+/-, respectively, from the object side. The image side lens unit has a negative optical power and is movable, along with at least one other lens unit, in a zoom... | 09/12/2000 |
| 6118593 | Zoom lens and optical apparatus having the same A zoom lens of the rear-focus type includes, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power and a fourth lens u... | 09/12/2000 |
| 6115188 | Optical system and optical apparatus having the same An optical system includes, in order from an object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, the second lens unit being movable along an optical axis to effect focusing, and a third lens unit o... | 09/05/2000 |
| 6108136 | Wide-angle zoom lens system The invention provides a wide-angle yet high-magnification zoom lens system which can have satisfactory performance with a simple lens arrangement, and an optical system which can make satisfactory correction for off-axis aberrations becoming a problem in... | 08/22/2000 |
| 6101043 | Zoom lens system A zoom lens system has, from the object side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power.... | 08/08/2000 |
| 6094313 | Zoom lens system The invention relates to a zoom lens system having stable performance and a high magnification, which comprises a first lens group G1 having positive refracting power, a second lens group G2 having negative refracting power, a third lens group G3 having p... | 07/25/2000 |
| 6088169 | Wide-angle zoom lens A wide-angle zoom lens is disclosed having four lens groups of negative, positive, positive, and positive refractive power, in order from the object side. By satisfying prescribed conditions, the overall length as well as the outer diameter of the wide-an... | 07/11/2000 |
| 6084720 | Small-sized real image mode zoom finder A real image mode zoom finder includes, in order from the object side, an objective optical system with positive refracting power having a first lens unit with negative refracting power, a second lens unit with positive refracting power, a third lens unit... | 07/04/2000 |
