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US Patent 6822805 - Objective lens
US Patent Issued on November 23, 2004
Estimated Patent Expiration Date:
November 18, 2022Estimated 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.
Estimated Patent Expiration Date:
November 18, 2022Estimated 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.AbstractAn objective lens includes a first lens group, a second lens group having a lens pair, a third lens group having a lens pair, a fourth lens group having a lens pair, a fifth lens group having a lens pair, and a sixth lens group. The objective lens is configured so as to satisfy the following conditional expressions:d/L<0.025 0.58<Rp/Rn<1.65 where L(mm) is the overall length of the objective lens; d(mm) is the air gap of each of the lens pair; Rp is the radius of curvature of each of positive refractive power surfaces opposing each other with the air gap therebetween; and Rn is the radius of curvature of a negative refractive power surface. Whereby, chromatic aberration can be corrected and resolution is exponentially improved without using a cemented lens, providing a deep ultra-violet objective lens with a high NA capable of auto focussing instantaneously. | InventorAssigneeApplicationNo. 10295821 filed on 11/18/2002US Classes:359/656, Microscope objective359/350HAVING SIGNIFICANT INFRARED OR ULTRAVIOLET PROPERTYField of Search359/656, Microscope objective359/657, Having seven components359/658, Having six components359/368, Microscope359/350, HAVING SIGNIFICANT INFRARED OR ULTRAVIOLET PROPERTY359/355, Lens, lens system or component359/356, Infrared lens359/357, Having four or more components359/754, Multiple component lenses359/755, Seven components359/756Six componentsExaminersPrimary: Schwartz, Jordan M.Attorney, Agent or FirmUS Patent References5440422, Method for manufacturing ultraviolet microscope dry objectives and microscope objectives manufactured in accordance with this methodIssued on: 08/08/1995 Inventor: Vollrath5469299, Objective lens system Issued on: 11/21/1995 Inventor: Nagano5886826, Microscope objective Issued on: 03/23/1999 Inventor: Amemiya5982559, Immersion microscope objective lens system Issued on: 11/09/1999 Inventor: Furutake6181480, Microscope objective Issued on: 01/30/2001 Inventor: Ito6392814, Microscope objectives lens Issued on: 05/21/2002 Inventor: Ono6507442Objective lens Issued on: 01/14/2003 Inventor: Kashima, et al. Foreign Patent References
International ClassG02B 2102 |
