Polaroid Corporation

Bell + Howell Company

Richard L Smith

Irving Erlichman

Roger E Clapp

George William Ruggiero

Justin Melvin James, Jr

Algis E Adomkaitis

A thermally sensitive image recording medium of the transparency type includes transparent support and recording layers and a strippably adhered light reflective background layer which provides a contrasting background against which recorded image components may be monitored by reflected light while image recording is in progress. Thereafter, the background layer is removed so that the image may be projected or otherwise viewed by transmitted light.

Thermal recording medium and method

Apparatus for positioning a projected image in response to input signals corresponding to the components of the commanded position of the image along a pair of orthogonal axes. The apparatus employs a pair of servo loops that position a projector mechanism along the respective axes. In each loop position feedback is provided by a capacitive transducer. A dielectric member is disposed between a pair of planar electrodes and moves back and forth in correspondence with movement of the projector mechanism. Consequently the area of the plates covered by the dielectric member, and thus the capacitance of the transducer, corresponds to the position of the mechanism. The capacitance of the transducer is converted to a dc signal by incorporating the capacitance in a conversion circuit that emits a series of pulses whose duty cycle is proportional to the capacitance.

Capacitive position sensor

A personal paging device is housed in a case which has one dimension (length) longer than its width or thickness, and a clip is affixed to a side on a swivel between the ends of the length dimension, which allows the device to be worn on the person in a vertical or a horizontal posture. A radio receiving antenna is carried on a flexible dielectric sheet within the casing, and radio components are enclosed within that sheet. A pair of orthogonally-related antenna loops can be provided on the dielectric sheet. The swivel clip can be arranged to cooperate with these or other antennas in a circular-polarization antenna system, such that in one orientation one or the other of the antennas will be detuned.

Growing community of inventors

Concord, MA, United States of America

Richard L Smith