EP0081653A2
Expired / Lapsed
EP
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Method of recording and reading optimum density bar code
Assignee: International Business Machines Corp
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Filing: 1982-10-14
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Granted: —
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Expires: 2002-10-14
Abstract
Abstract Test patterns (6) in bar code of different densities are printed at the start of document (20) preparation. The test patterns (6) are immediately read at different timing intervals (59) corresponding to the densities of the patterns. The highest density pattern (6) having test data which is recognized by the logic (61) as correctly sensed, defines the subsequent printing density to be used. The first line of data 3 is however printed in the lowest density with a code defining the density of the subsequent printing. When a document (20) is read, said first line (3) is read with a clock (59) frequency corresponding to the lowest density. The frequency is then changed to that definied by the code in said first line.
Inventors
- 👤 Michael Leroy Krieg
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:23
CPC Classifications
G; G06; G06K; G06K1/00; G06K1/12; G06K1/121; G06K7/00; G06K7/01; G06K7/016; G06K7/0166
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
165 words
A method of recording information in a print receiving medium (1) in a bar code in which the distance between the edges of separated marks defines the meaning of said code, characterized in that it comprises the steps of (1) printing a plurality of test patterns (6a, 6b, 6c) each of which is a group of marks in said code of predetermined significance, the density of the marks in a group being different from the densities of the marks in theother groups, (2) subsequently sensing said test patterns (6a, 6b, 6c) with a sensing apparatus (32) and determining the apparent significance of each said test patterns, (3) comparing said apparent significance of each of said test patterns with the predetermined significance of that test pattern, and (4) printing subsequent data (3) on said medium (1) in said code with separation of marks at a distance between edges corresponding to the density of the highest density test pattern whose apparent significance corresponds to its predetermined significance.
Claim 2
Independent Claim
165 words
A method of recording information in a print receiving medium (1) in a bar code in which the distance between the edges of separated marks defines the meaning of said code, characterized in that it comprises the steps of (1) printing a plurality of test patterns (6a, 6b, 6c) each of which is a group of marks in said code of predetermined significance, the density of the marks in a group being different from the densities of the marks in theother groups, (2) subsequently sensing said test patterns (6a, 6b, 6c) with a sensing apparatus (32) and determining the apparent significance of each said test patterns, (3) comparing said apparent significance of each of said test patterns with the predetermined significance of that test pattern, and (4) printing subsequent data (3) on said medium (1) in said code with separation of marks at a distance between edges corresponding to the density of the highest density test pattern whose apparent significance corresponds to its predetermined significance.
Claim 3
Dependent Claim
52 words
The method as in claim 1 in which prior to said printing at said highest density, a predetermined portion of data is printed in bar code at the lowest density of said test patterns, said predetermined portion of data containing a designation of the density at which said subsequent data are printed.
Claim 4
Independent Claim
56 words
The method as in claims 1 or 2 in which said sensing apparatus (32) is adapted to sense at regular intervals in response to clock (59) signals and including the steps of changing said clock signals to different frequencies to accurately read data at the density of different ones of said test patterns (6a, 6b, 6c0.
Claim 5
Dependent Claim
47 words
The method as in claim 1, 2 or 3 in which said test patterns (6a, 6b, 6c) are separated by areas of predetermined content different from said bar code and the existence of said test pattern (6a, 6b, 6c) is recognized by said areas of predetermined content.
Claim 6
Dependent Claim
24 words
The method as in claim 1, 2, 3 or 4 in which said test patterns (6a, 6b, 6c) are at least three in number.
Claim 7
Dependent Claim
90 words
A method of reading the information recorded in accordance with the method of claim 2, characterized in that it comprises the steps of : (1) reading said predetermined portion of data with a sensing apparatus adapted to sense at a predetermined frequency of regular intervals r said frequency corresponding to said lowest density; (2) setting the frequency of said intervals in accordance with the density designation contained in said predetermined portion of data and sensed by said sensing apparatus. (3) reading said subsequent data at said set frequency of intervals.
References Cited (Backward Citations)
No citation records indexed.
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