JPS61169976A - Bar code symbol - Google Patents

Abstract

PURPOSE:To improve the reading efficiency of bar codes by forming a black bar in the front of a blank part of a bar code symbol. CONSTITUTION:The black bar 7 is added to the front of the blank part 15 having a space corresponding to seven bars or more and a guide bar part 8 consists of one or two or more bars. An electric analog signal 10 is obtained by cross scanning of a scanning line over the bar codes. A white/black discriminating level 11 can relatively obtained in accordance with the level of the signal 10 and signal parts 12, 13 corresponding to the bars 7, 8 can be also obtained. Since a signal based upon the bar 7 is inserted into the signal part 12, the white/black discriminating part 11 is set up to a level for detecting the whole blank part 15 formed in the front of the bars 8 sufficiently like the signal part 13. Consequently, the blank formed so as to cross the bar code symbol in the front of the symbol can be detected without an error and the symbol can be easily recognized, so that the reading efficiency of the bar codes can be improved and a misreading ratio can be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is based on P O 8 (Poih of 8ale
a) Self-dih of nona-code symbols in the system
The present invention relates to a barcode symbol that increases the possibility of reading the barcode symbol in an m-reading device and further reduces the possibility of misreading.

[Conventional Mt. Barcode symbols intended to be read optically by stationary or mobile scanners are based on the Japanese domestic standard JAN (Japanese Articl).
eNumber), as well as the international standard UPC (
universal product code) r
E A N (European Article
In the case of 1fls on the inner and outer sides, a guide bar @ area of 3 modules each is provided, and furthermore, a margin of 7 modules or more called a red margin and a light margin is provided outside of the guide bar area.

When a barcode symbol of JAU, UPC, or EAR is optically read by a scanner, the reflected light from the symbol is converted into an electrical analog signal, and from this signal, black par and white par are determined. In a type or mobile scanner, the absolute level of the reflected light of a symbol is not unique, so the black and white edges are usually determined by the relative ratio of the signal levels.

When reading a conventional code symbol using a stationary or mobile scanner, in order to distinguish the symbol signal from the fya signal, the beginning of the symbol can be determined from only the symbol guide bar and margin signals. Alternatively, it detected the end and processed the signal.

In FIG. 3, (15) and (18) are symbols l1f
The margin tMS of l& is more than 7 par pars. (16), (17) are part of the guide bar, (19) is the scanning line of the scanner that crosses the bar code, (20) is an electrical analog signal that is passed by the scanning of the scanning line (19);
(21) White/black determination level relatively determined by the level of the ld electrical analog signal (20), (22)
, (25) are signal parts corresponding to the margin parts (15) and (18), (23) and (24) are part of the guide bar (1
6) and (17). in this case,
The margin crossed after the guide bar (17) is determined relatively depending on whether the judgment level (21) is in the signal part (24), so relative comparison is also possible in the signal part (25). Although it is an oT function, the margin crossed before the guide bar (16) is determined to be at the judgment level (2) if there is a margin in front of it.
1) becomes undefined, making it difficult to determine whether the signal portion (22) is black or white.

[Problem that the invention seeks to solve]

In this way, in conventional barcode symbols, the blank space that the scanner's scanning line crosses after the symbol can be recognized as a blank space, but the blank space that the scanner scan line crosses after the symbol can be recognized as a blank space, but if the blank space continues for a long time, the relative comparison of signals will be difficult. Therefore, there is a high possibility that the bar code symbol cannot be recognized as a blank space, and there is a problem in that the signal of the bar code symbol cannot be sufficiently captured.

This invention was made in order to solve the problems mentioned above, and it is possible to accurately capture not only the margin that crosses after the symbol, but also the margin that is [1fJKIIff1] of the symbol, and also accurately captures the symbol signal. The objective is to provide a barcode symbol that has a high reading rate and a low misreading rate by capturing the information.

[Means for Solving Problems J] The barcode symbol h according to the present invention is located further outside the margins at both ends of the conventional barcode symbol.

Each hole has a black hole of one module or more.

[Effect]

In this invention, the black bar outside the margin clearly indicates the signal in the margin by relatively comparing the signal with the black bar even if the scanner scanning line crosses the margin before the symbol. By recognizing this, the number of events in which the scanner can distinguish the symbol signal from other signals increases, and the barcode symbol can be captured more accurately.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. An example of a barcode symbol according to the present invention (1),
(6) is a black par with a width of more than one par that is added regarding this invention, (2), (5), (3), and (4) are seven pars that were added in the conventional barcode symbol. This is the margin and part of the guide bar that is larger than this.

FIG. 2 is a diagram for explaining the invention in detail.
7) is an added black part having the same size and function as the black part (1), (8) is a guide part, (9) is a barcode scanning line, and (10) is a black part added by scanning (9). The resulting electrical analog signal, (11) f
The white/black judgment level is relatively determined by the level of the analog signal (lO), (12),
(13) A signal portion corresponding to the ri black par (7) and the guide bar (8), and (15) a margin portion having a width equal to or more than seven pars.

In this case, the margin area (15) provided with ri+IK of the guide bar (8) is affected by the signal from the black par (7) when the black and white determination level (11) is at the signal area (12). ) as shown in the margin (15)
The level is high enough to detect the whole area. Therefore, a blank space provided across the front of the barcode symbol can be detected without error.

[Effects of the Invention] As described above, according to the present invention, since a black mark (-) is provided before the margin of the conventional barcode symbol, when it is read by a scanner, it is easier to recognize it as a symbol, and the barcode symbol is It has the effect of improving the code reading rate and reducing the misreading rate.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a barcode symbol according to an embodiment of the present invention, FIG. 2 is a diagram illustrating the effects of this invention,
FIG. 3 is a diagram illustrating problems with conventional barcode symbols. In the figure, (1), (6), and (7) are newly provided black pars according to this invention, (2), (5), (15),
(18) is the margin part, (3) (4), (8), C1
6), (17) are part of the guide bar, (9), (19)
is the scan line of the gap that scans the barcode symbol, (l
O) is the signal obtained by scanning the scanning line (9), (20
) is the signal obtained by scanning the scanning line (19), (11
) is the black and white determination level determined by the level of the signal (10), and (21) is the black and white determination level determined by the level of the ri times signal 20).

Claims (1)

[Claims] A symbol bar part in which black bars and white bars of unit width corresponding to the binary symbol "1" or "0" are arranged on a single axis corresponding to each symbol code, and a predetermined interval is placed on both sides of the symbol bar part. A guide bar section consisting of one or more bars arranged in an array, a margin section with a width of at least 7 units provided on both sides of the guide bar section, and a margin section provided on the outside of the margin section. A barcode symbol comprising a black bar portion having a width of at least two units.