Apparatus for providing a predetermined surface scan velocity of

Details Apparatus for providing a predetermined surface scan velocity of Apparatus for providing a predetermined surface scan velocity of

1987-08-07

1989-06-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

350 61, 74 55, H01J 516, G02B 2608

Patent

active

048374334

ABSTRACT:
Apparatus is disclosed for providing a predetermined surface scan velocity of the projected field of view of a scanning instrument. The invention is adapted for use in a scanning instrument having scan drive means including an inertial element and detector means coupled to the inertial element for detecting or projecting radiation during a scan. The invention includes cam means mechanically coupled to said inertial element and supported, by a frame, to pivot therewith. The cam means includes a cam having a contour which is varied to provide a specific surface scan velocity profile for the projected field of view. A spring is coupled to the cam via a bearing which translates in response to the contour of the cam as the cam and the inertial element pivot during scan. The spring is attached to the frame to maintain the bearing in contact with the cam. The spring effectively stores energy from and restores energy to the inertial element via the bearing and the cam. The invention effectively transfers the kinetic energy of said inertial element to potential energy as said inertial element scans in a first direction and transfers the potential energy to kinetic energy as the inertial element scans in a second direction.

REFERENCES:
patent: 2263333 (1941-11-01), Finch
patent: 2313119 (1943-03-01), Brand
patent: 2919624 (1960-01-01), Lindemann et al.
patent: 3862423 (1975-01-01), Kutas et al.
patent: 3864981 (1975-02-01), Schlegel
patent: 3991789 (1976-11-01), Wojcikowski

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