Static information storage and retrieval – Magnetic bubbles – Guide structure
Patent
1982-05-10
1984-10-23
Lee, John D.
Static information storage and retrieval
Magnetic bubbles
Guide structure
350 9612, 365215, G02B 5174
Patent
active
044784830
ABSTRACT:
A variable length electro-optic waveguide is used to adjust the input conjugate of a focusing lens, thereby providing a relatively high speed and inexpensive focus control device having a wide dynamic control range for optical memories and the like. A pair of segmented electrodes are deposited in spaced apart relationship on or near a surface of an electro-optic element, and provision is made for individually addressing the electrode segments, whereby the effective length of the waveguide may be increased or decreased by increasing or decreasing, respectively, the number of adjacent electrode segments that are being actively driven at any given time. In keeping with one of the more detailed features of this invention, a multi-layer electrode construction is preferred so that the electrode segments may be interleaved in stacked, overlapping relationship to create a substantially continuous waveguide of controllable length.
REFERENCES:
patent: 3795433 (1974-03-01), Channin
patent: 4281904 (1981-08-01), Spargue et al.
patent: 4415226 (1983-11-01), Verber et al.
Lee John D.
Ullah Akm E.
Xerox Corporation
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