Optical: systems and elements – Lens – Microscope objective
Patent
1997-11-14
1999-03-23
Dang, Hung Xuan
Optical: systems and elements
Lens
Microscope objective
359656, G02B 2102
Patent
active
058868275
ABSTRACT:
An objective lens system having a first and a second lens group that are separated by a gap where a ray bundle between the first and second lens is substantially telecentric and the second lens group has two lens elements that are also separated by a gap. The first lens element in the second lens group is a positive optical power lens and the second lens element in the second lens group is a negative optical power lens. The objective lens system has a relatively small number of lens elements and the aberration, including chromatic, spherical, coma, astigmatic difference, and distortion, are favorably corrected. In one embodiment, the objective lens system is used in a plan-achromatic microscope objective lens having a numerical aperture of 1.25 to 1.30 with a Petzval sum of 0.1. In a second embodiment, the objective lens system with is used in an achromat microscope objective lens with improved resolution and a greater than 50% transmittance of light at a wavelength of 340 nanometers.
REFERENCES:
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patent: 5440422 (1995-08-01), Vollrath
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patent: 5517360 (1996-05-01), Suzuki
patent: 5530590 (1996-06-01), Saito
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Dang Hung Xuan
Halbert Michael J.
Nikon Corporation
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