Xin Cai Zheng

US Patent:

58549455, Dec 29, 1998

Filed:

Jan 21, 1997

Appl. No.:

8/781345

Inventors:

Herbert V. Criscito - Denville NJ
Xin Zheng - Northvale NJ
Brian Zhang - Riveredge NJ

Assignee:

Opticon, Inc. - Orangeburg NY

International Classification:

G06F 1300

US Classification:

395882

Abstract:

A bar code scanner having means for reading bar code data and for processing the data includes means for supplying the processed data to a computer having an input/output (I/O) port designed for the connection thereto of an external keyboard. The scanner includes "communication" means for enabling the scanner either to be "wedged" between an external keyboard and the I/O port or to be directly connected to the I/O port. The scanner's "communication" means includes means for sensing whether an external keyboard is connected to the computer and includes means responsive to sensing the absence of an external keyboard connection for producing signals similar to those produced by an external keyboard and for supplying these signals to the computer in order to establish and maintain communication between the scanner and the computer. The bar code scanner may also include means for responding to various computer commands and/or keyboard commands.

US Patent:

51966840, Mar 23, 1993

Filed:

Mar 25, 1991

Appl. No.:

7/674709

Inventors:

Jackson Lum - Roslyn NY
Gerard J. Knight - Nesconset NY
Xin Zheng - Island Park NY
Wenyu Han - Flushing NY

Assignee:

Opticon, Inc. - Orangeburg NY

International Classification:

G06K 710

US Classification:

235462

Abstract:

A method for scanning and decoding the symbols of a bar code label using a CCD image sensor viewing the bar code, and coupled to a signal processor and memory, wherein initially a start of scan (SOS) first level signal is sent from the processor to the CCD image sensor, a digital data signal representative of the bar code is read from the CCD sensor, and the representative data signal read from the CCD sensor is stored in memory. When the SOS signal is at a second signal level, the stored data is validated and decoded to determine if the representative data is valid or invalid. The SOS first level signal is immediately restarted in response to an invalid bar code data signal to recollect bar code data signals from the CCD sensor viewing the bar code so that the scanning steps are repeated, or the SOS first level signal is immediately restarted to re-scan the bar code symbols immediately after the data signal is found valid. Thus, the CCD data collecting scan rate is maximized.