JOHN F MCGRATH, JR
Engineering in Arlington, MA
License number
Massachusetts 14157
Expiration Date
Jun 30, 1984
Type
Mechanical Engineer
Address
Address
Arlington, MA 02474
Professional information
Constant Deviation Scanning Apparatus
US Patent:
4934780, Jun 19, 1990
Filed:
Dec 27, 1988
Appl. No.:
7/290353
Inventors:
John F. McGrath - Arlington MA
Assignee:
Compugraphic Corporation - Wilmington MA
International Classification:
G02B 2610, G02B 504
US Classification:
350 64
Abstract:
A constant deviation beam scanning apparatus having a rotatable beam deflector with at least one reflective surface thereof lying in a plane that intersects the axis of rotation at an acute angle. One embodiment utilizes a rotatable, truncated, n-sided pyramidal mirror with at least one planar reflective scanning segment located on one of the n-sides of the pyramidal mirror. The pyramidal mirror's truncation surface lies in a plane normal to the mirror's rotation axis and contains at least one planar reflective segment. A constant deviation reflector having two reflective surfaces is positioned so that a collimated beam of light reflected by the truncation surface reflective segment is reflected by one of the constant deviation reflective surfaces to the other reflective surface and then to the at least one planar reflective scanning segment of the pyramidal mirror.
Constant Deviation Scanning Apparatus
US Patent:
4793672, Dec 27, 1988
Filed:
Apr 8, 1987
Appl. No.:
7/035974
Inventors:
John F. McGrath - Arlington MA
Assignee:
Compugraphic Corporation - Wilmington MA
International Classification:
G02B 2610
US Classification:
350 67
Abstract:
A constant deviation beam scanning apparatus having a rotatable beam deflector with at least one reflective surface thereof lying in a plane that intersects the axis of rotation at an acute angle. One embodiment utilizes a rotatable, truncated, n-sided pyramidal mirror with at least one planar reflective scanning segment located on one of the n-sides of the pyramidal mirror. The pyramidal mirror's truncation surface lies in a plane normal to the mirror's rotation axis and contains at least one planar reflective segment. A constant deviation reflector having two reflective surfaces is positioned so that a collimated beam of light reflected by the truncation surface reflective segment is reflected by one of the constant deviation reflective surfaces to the other reflective surface and then to the at least one planar reflective scanning segment of the pyramidal mirror.