Frederick A Herring

US Patent:

55439632, Aug 6, 1996

Filed:

Jun 1, 1995

Appl. No.:

8/457550

Inventors:

Candace J. Freedenberg - Holly Ridge NC
Frederick A. Herring - Wappingers Falls NY
Uldis A. Ziemins - Poughkeepsie NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G02B 1514

US Classification:

359432

Abstract:

A train of air spaced optical mechanisms capable of taking a raw laser beam and focusing it on a workpiece for a range of cut sizes with varying magnifications and energy densities while controlling divergence and providing optimum uniformity. The lenses are diffraction limited for optimum uniformity and edge definition. The system uses variable down collimators to condense the beam to an aperture plane. The aperture is then imaged to the workpiece with Barlow, zoom transfer, collimator, and objective lenses. The components are color corrected to aid in alignment of an invisible beam and allow the aperture to be imaged to a workpiece in visible light.

US Patent:

54484103, Sep 5, 1995

Filed:

Jul 31, 1992

Appl. No.:

7/923284

Inventors:

Candace J. Freedenberg - Holly Ridge NC
Frederick A. Herring - Wappingers Falls NY
Uldis A. Ziemins - Poughkeepsie NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G02B 1514

US Classification:

359676

Abstract:

A train of air spaced optical mechanisms capable of taking a raw laser beam and focusing it on a workpiece for a range of cut sizes with varying magnifications and energy densities while controlling divergence and providing optimum uniformity. The lenses are diffraction limited for optimum uniformity and edge definition. The system uses variable down collimators to condense the beam to an aperture plane. The aperture is then imaged to the workpiece with Barlow, zoom transfer, collimator, and objective lenses. The components are color corrected to aid in alignment of an invisible beam and allow the aperture to be imaged to a workpiece in visible light.

US Patent:

53051386, Apr 19, 1994

Filed:

Jul 31, 1992

Appl. No.:

7/923283

Inventors:

Candace J. Freedenberg - Holly Ridge NC
Frederick A. Herring - Wappingers Falls NY
Uldis A. Ziemins - Poughkeepsie NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G02B 1314
G02B 1300
G02B 908
G02B 912

US Classification:

359355

Abstract:

A superachromatic focusing objective lens which focuses wavelengths extending between the ultraviolet and the visible wavelength spectrum and is able to achieve superachromatic correction for three wavelengths within the visible spectrum is disclosed. The present objective lens includes an achromatic lens to assist in the correction spherical and coma aberration, a modified gauss for minimizing spherochromatism, a reversed modified gauss for adding symmetry to aid in the correction of coma, distortion and lateral color aberrations, and a stop located between the modified gauss and the reverse modified gauss. A glass plate is provided for forming a splatter shield to protect the lens from debris, and may be used to define one wall of a vacuum chamber. The elements of the objective lens may be made from various glasses to include calcium fluoride, quartz, and barium fluoride.

US Patent:

57777985, Jul 7, 1998

Filed:

Mar 25, 1996

Appl. No.:

8/618022

Inventors:

Candace Joy Freedenberg - Holly Ridge NC
Frederick Albert Herring - Wappingers Falls NY
Uldis Artis Ziemins - Poughkeepsie NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G02B 1514

US Classification:

359676

Abstract:

A train of air spaced optical mechanisms capable of taking a raw laser beam and focusing it on a workpiece for a range of cut sizes with varying magnifications and energy densities while controlling divergence and providing optimum uniformity. The lenses are diffraction limited for optimum uniformity and edge definition. The system uses variable down collimators to condense the beam to an aperture plane. The aperture is then imaged to the workpiece with Barlow, zoom transfer, collimator, and objective lenses. The components are color corrected to aid in alignment of an invisible beam and allow the aperture to be imaged to a workpiece in visible light.