The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 1976
Filed:
Apr. 03, 1975
James Thomas Carlo, Richardson, TX (US);
Hon Wai Lam, Cambridge, MA (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A magnetic bubble detector comprising a planar layer of magnetic material in which magnetic bubble domains can be moved and a thin planar film on one surface of that layer. The layer has a magnetization perpendicular to the plane of the layer while the film has a magnetization in the plane thereof. The planar layer and film comprise an optical waveguide for propagation of linearly polarized light therethrough along a first axis. Linearly polarized light is coupled into the guide. A bubble expander stretches bubble domains in a direction transverse to their direction of movement as they are moved in the layer of magnetic material past the light guide on a second axis transverse the first axis. A sensor including a light coupling device for coupling light out of said waveguide senses changes in the polarization mode of the light propagating along the axis of the waveguide whereby the fringing field of the stretched bubble will modulate the polarized light propagating along the first axis and provide a light output signal from the sensor thereby indicating the passage of a magnetic domain.