Richard C Huhn

US Patent:

54731500, Dec 5, 1995

Filed:

Sep 26, 1994

Appl. No.:

8/312377

Inventors:

Richard J. Huhn - Franklin WI

Assignee:

Allen-Bradley Company, Inc. - Milwaukee WI

International Classification:

G06K 710

US Classification:

235472

Abstract:

A bar code reader including automatic scan beam focusing based upon decoding performance is disclosed herein. The bar code reader includes a focusing lens which is movably supported along the light path of the scanning beam. An electric motor is coupled to the lens support to move the lens relative to the light beam source in response to control signals. The control signals are produced based upon the data error rate for the data produced by the decoding circuit of the reader from the signals produced by the photodetector therein. Based upon the data error rate, the electric motor is controlled to move the lens to focus the light beam and reduce or eliminate the data error.

US Patent:

51423960, Aug 25, 1992

Filed:

Mar 26, 1990

Appl. No.:

7/501420

Inventors:

August A. Divjak - Waukesha WI
David W. Christenson - Milwaukee WI
Richard J. Huhn - Franklin WI
Paul G. Kucharski - South Milwaukee WI
Daniel E. Schuster - Milwaukee WI

Assignee:

Johnson Service Company - Milwaukee WI

International Classification:

H04B 1000

US Classification:

359142

Abstract:

An improved control system utilizing infrared communication channels for remote station control is provided. A central base controller communicates with one or more channels of sub-networks through one or more field interface controllers. Each field interface controller utilizes a dedicated base infrared transceiver for transmitting envelopes of definable duration at a preselected infrared oscillation frequency. At least one remote station receives said transmitted infrared signals at an infrared transceiver tuned to said oscillation frequency. Associated devices at the remote station decode the information from said infrared transmission or issue instructions and information to an associated input/output device. Communication over the infrared channel between the base and the remote stations utilizes a unique pulse position protocol. An initiating clear pulse begins all communications.