Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-01-30
2007-01-30
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C345S166000, C250S23700G, C356S499000
Reexamination Certificate
active
10894078
ABSTRACT:
A single-, two- or three-axis opto-electronic encoder, or error-inputting device, with an optical scale which is overall cylindrical, spherical or volumetric, as opposed to extant planar, circular optical scales; mostly parallel rays of light enter from the cylindrical or spherical surface of the scale, travel, with or without being modulated in intensity due to rotation/rotations of, or distortion/distortions in, the scale, along elliptical and/or circular sectional planes of the scale and exit to fall upon an obstructing opto-electronic sensor or a plurality of such sensors. A photo-transmissive spherical float on a photo-opaque liquid sealed inside a spherical optical scale, moving vertically under the influence of an external force, upwardly displacing the photo-opaque liquid to block the light that enters the spherical optical scale from reaching any of the opto-electronic sensors, produces a distinct electronic condition for auxiliary use in addition to or conjunction with encoder or error-inputting device output or outputs.
REFERENCES:
patent: 5323001 (1994-06-01), Igaki et al.
patent: 5902999 (1999-05-01), Yanagi
patent: 6084574 (2000-07-01), Bidiville
Ko Tony
Luu Thanh X.
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