Telescopic zoom lens system
Patent 6577449 Issued on June 10, 2003. Estimated Expiration Date: 
January 21, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 21, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesFinding device of variable magnification 5117247 Zoom lens Device for adjusting the diopter setting of a finder assembly Device for adjusting the diopter setting of a finder assembly Zoom lens system Real image mode variable magnification finder Small-sized real image mode zoom finder Patent #: 6084720 InventorAssigneeApplicationNo. 488680 filed on 01/21/2000US Classes:359/676, With variable magnification (e.g., zoom type)359/421, Selectable magnification359/422, Variable magnification359/432, Variable magnification359/686, Four groups359/691Two groupsExaminersPrimary: Epps, GeorgiaAssistant: Thompson, Jim Attorney, Agent or FirmInternational ClassesG02B 015/14G02B 023/00 G03B 013/06 Foreign Application Priority Data1999-01-22 JPAbstractA telescopic zoom lens system has a minimum magnification thereof is more than 2, and includes a positive objective lens group, and a positive eyepiece lens group, in this order from the object. Further, a zooming lens group which is made moveable along the optical axis upon zooming is positioned on the side of the object with respect to the primary image forming plane of the objective optical system. | |
