Acoustics – Diaphragm and enclosure – Reflector baffle
Patent
1988-04-07
1989-07-04
Fuller, B. R.
Acoustics
Diaphragm and enclosure
Reflector baffle
181175, 181176, 181199, 381155, 381160, H05K 500
Patent
active
048441988
ABSTRACT:
A lens incorporates two reflective shells. One shell's surface is generated when a parabola is rotated around a line which lies in the parabolic plane perpendicular to its axis of symmetry. The other shell's surface is generated when an ellipse is rotated about a line lying in the elliptic plane and passing through one focal point at a finite angle to its major axis. The parabolically-generated shell has a characteristic focal curve while the elliptically-generated shell has both a characteristic focal curve and a focal point. The lens incorporates these shells which are aligned so that they have coincident focal curves and axes of rotation. Plane wave radiation travelling parallel to the axis of rotation of the lens will be focused at the focal point of the elliptically-generated shell. Conversely, a transducer placed about this common focal point and can produce radiation which will be converted into a plane wave radiation. Additional transducers can be placed at the lens' focal curve to process the radiation for signal tracking and self-alignment. The lens operates as a transmitter or receiver of acoustic or electromagnetic radiation.
REFERENCES:
patent: 711974 (1902-10-01), Hyde
patent: 1716199 (1929-06-01), Hofe et al.
patent: 2087052 (1937-07-01), Steuart
patent: 4550609 (1985-11-01), Johnson
patent: 4629030 (1986-12-01), Ferralli
C. A. Balanis, Antenna Theory-Analysis and Design, Harper & Row, Publishers, Inc., New York, NY, 1982, pp. 604-642.
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