Optical: systems and elements – Prism – With reflecting surface
Patent
1990-07-27
1991-08-06
Bovernick, Rodney B.
Optical: systems and elements
Prism
With reflecting surface
359849, G02B 718
Patent
active
050371908
ABSTRACT:
A construction for a deformable mirror is disclosed in which each of the electrodistortive actuators used to selectively impart deformations to the mirror's reflecting facesheet are mechanically fastened to the facesheet and may be disengaged from the facesheet by operating a fusible link. In one preferred embodiment the fusible link consists of a layer of thermoplastic material covering an electrical resistive element located between the top of the actuator and the point on the facesheet at which the actuator is mechanically bonded to the facesheet. Heat generated by the resistive element may be used to melt the thermoplastic material fastening the actuator to the facesheet. The second preferred embodiment provides a fusible link consisting of an electrocapacitive layer sandwiched between two electrically-conducting layers. When an electrical signal is applied to the two chemical conducting layers, the electrocapacitive layer is mechanically severed from the actuator, thereby permitting the actuator to be removed from contact with the facesheet.
REFERENCES:
patent: 4657358 (1987-04-01), Anthony et al.
patent: 4906087 (1990-03-01), Ealey et al.
patent: 4934803 (1990-06-01), Ealey
patent: 4940318 (1990-07-01), Ealey et al.
Ealey Mark A.
Wellman John A.
Bovernick Rodney B.
Litton Systems Inc.
Rotella Robert F.
Ryan J. P.
Wallach Michael H.
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