Registers – Coded record sensors – Particular sensor structure
Patent
1993-11-30
1995-08-22
Hajec, Donald T.
Registers
Coded record sensors
Particular sensor structure
235454, G06K 710
Patent
active
054442303
ABSTRACT:
An apparatus for reading an optical bar code on a transparent film uses a linear array of light sources and a linear, solid-state sensor located parallel with array. LED's are energized selectively in groups to avoid overlapping shadows on the sensor. A novel algorithm is used to reconstruct the shadowgraphs or image segments by searching for a transition (mark/space edge in the bar code) in an overlap zone at the boundary of adjacent segments on the sensor. Conventional techniques are then used to decode the reconstructed electronic image of the bar code. The apparatus is particularly useful in an electronic presentation system wherein the numeric value of the bar code is an image reference number (IRN) which is used to access a host computer and display a graphic image associated with the IRN. A novel bi-directional protocol is also presented for providing communications between the optical reader and the host computer. The protocol directs the host computer to download all IRN's for a given presentation to the reader. The reader can then locally determine if a bar code on a card corresponds to a valid IRN in the current presentation. The protocol may be adapted to download certain display control information and send associated control signals to the host computer based on keyboard input at the reader.
REFERENCES:
patent: 2633655 (1945-08-01), Langan
patent: 3839625 (1974-10-01), Chadima, Jr. et al.
patent: 4542528 (1985-09-01), Samer et al.
patent: 4644143 (1987-02-01), McJohnson et al.
patent: 4652731 (1987-03-01), Chautemps et al.
patent: 4801788 (1989-01-01), Osaka
patent: 4870604 (1989-09-01), Tatsumo
patent: 4882473 (1989-11-01), Bengenow et al.
patent: 4935608 (1990-06-01), Tanaka
patent: 4963726 (1990-10-01), Chechetti
patent: 4994987 (1991-02-01), Baldwin
patent: 5001696 (1991-03-01), Baldwin
patent: 5053612 (1991-10-01), Pielemeier et al.
patent: 5081364 (1991-01-01), Wike, Jr.
patent: 5105070 (1992-04-01), Wike, Jr. et al.
patent: 5118930 (1992-06-01), Takada
patent: 5135160 (1992-08-01), Tasaki
patent: 5184005 (1993-02-01), Ukai et al.
patent: 5185514 (1993-02-01), Wike, Jr. et al.
patent: 5192856 (1993-03-01), Schaham
patent: 5196684 (1993-03-01), Lum et al.
patent: 5210398 (1993-05-01), Metlitsky
patent: 5216523 (1993-06-01), Kawanowa et al.
patent: 5218192 (1993-06-01), Fujii et al.
patent: 5233171 (1993-08-01), Baldwin
IBM Technical Bulletin, "Mark/Sensing with Transmitted Light" Hammer et al. Jun. 1958, vol. 1, No. 1.
Baldwin Dwight G.
Kennedy James K.
Saxe Steven G.
Griswold Gary L.
Hajec Donald T.
Kirn Walter N.
Le Thien Minh
Minnesota Mining and Manufacturing Company
LandOfFree
Solid state optical reader with bi-directional protocol does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Solid state optical reader with bi-directional protocol, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Solid state optical reader with bi-directional protocol will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2143068