JP2841853B2 - Data recording medium and method of reading data from this data recording medium - Google Patents

Description

The present invention relates to a recording medium for recording data and a method for reading data from the data recording medium.

(Prior Art) Conventionally, as a data recording method using an apparatus, there is a magnetic data system or a barcode system.

In a magnetic card system, a magnetic stripe on which predetermined magnetic data is recorded is formed on a magnetic card, and the magnetic stripe is brought into contact with a magnetic head to read the magnetic data.

In the bargod system, a white background portion having a predetermined size is formed on the surface of an object, a barcode is drawn on the white background portion, and the barcode is read by a barcode reader.

(Problems to be Solved by the Invention) However, in the case of a magnetic card system, there is a problem that data reading becomes difficult when magnetic data recorded on a magnetic stripe is demagnetized by an external magnetic force. Further, in the case of a barcode system, since the barcode itself is extracted on the card or the barcode itself is directly read, there is a problem that data confidentiality is low and forgery prevention is disadvantageous. .

Japanese Patent Application Laid-Open No. Sho 57-157 discloses a method for identifying a printed material in which moire is generated by halftone dots to identify the printed material.
Japanese Patent Application Laid-Open No. 57-10885 has a problem that the moire generated from the halftone dot pattern has poor contrast and the reading of the recorded data cannot be confirmed clearly.

(Object of the Invention) The present invention has been made in view of such a problem, and a data recording body and a data reading method in which recorded data are hardly erased and data confidentiality is high and forgery is difficult. The purpose is to provide.

(Means for Solving the Problems) A first invention of the present invention is to irradiate light through a translucent collation sheet on which a fine parallel line pattern or an orthogonal lattice line pattern with a predetermined pitch is drawn. In the non-translucent sheet, a fine parallel line pattern having the same or a different pitch from the collation sheet, or a binary system in which an orthogonal grid line pattern is drawn, or a 10 A data recording medium having a code mark for displaying a binary number, wherein a continuous detection signal per one moiré fringe obtained by detecting light reception of the code mark by a photoelectric conversion unit via the collation sheet. tm and the continuation detection signal tn per part where no moiré is generated are the reference continuation signal tmo per moire fringe and the part 1 where no moiré is generated, respectively. A data recording medium characterized in that the identification numerical data of the code mark corresponding to the continuation detection signal or the combination continuation detection signal thereof is read only when it belongs to the range of the reference continuation signal tno per book. is there.

Next, a second invention provides a light-transmitting collation sheet in which a fine parallel line pattern or orthogonal lattice line pattern with a predetermined pitch is drawn, and a fine parallel line pattern with the same or different pitch as the joining sheet. Or a non-translucent data recording medium having a code mark for displaying a binary or decimal numerical value obtained by extracting an orthogonal grid line pattern so that the parallel line patterns of the two are parallel to each other or at a predetermined angle. Moire fringes are generated on the code mark by superimposition, and the photoelectric conversion means detects the continuous detection signal tm per one moire fringe and the continuous detection signal tn per part where no moire is generated. Continuation detection signal tm per moiré fringe The continuation detection signal tn per moire-free portion is a reference code mark continuation signal tmo per moiré fringe, respectively. Only when the signal belongs to the range of the reference code mark continuation signal tno per part where no arraying occurs, the identification numerical data of the code mark in the data recording medium corresponding to the continuation detection signal or the combination continuation detection signal thereof This is a method for reading data from a data recording medium, which is characterized by reading data.

Next, in the third invention, a fine parallel line pattern or an orthogonal lattice line pattern of a predetermined pitch is drawn, and the recording data is expressed by moiré fringes generated by irradiating light through a translucent collating sheet. In order to be able to do so, a non-translucent sheet is provided with a code mark for displaying a binary or decimal numerical value obtained by extracting a fine parallel line pattern having the same or different pitch from the collation sheet, or an orthogonal lattice line pattern. A continuation detection signal tm per moire fringe obtained by detecting and receiving the code mark by the photoelectric conversion means via the collation sheet, and a portion where no moire is generated. The continuation detection signal tn is within the range of the reference continuation signal tmo per moiré fringe and the reference continuation signal tno per moiré-free portion. Only if it belongs, which is a data recording medium, characterized in that the identification numerical data of the code marks corresponding to the continuation detection signal or a combination thereof continuous detection signal is to be read.

Next, a fourth invention provides a non-light-transmitting collating sheet on which a fine parallel line pattern or a rectangular grid line pattern with a predetermined pitch is drawn, and fine parallel lines with the same or different pitch from the collating sheet. A pattern or a translucent data recording medium having a code mark for displaying a binary or decimal numerical value obtained by extracting an orthogonal grid line pattern so that the parallel line patterns thereof are parallel to each other or at a predetermined angle. Moire fringes are generated on the code mark by superimposition, and the photoelectric conversion means detects the continuous detection signal tm per moire fringe and the continuous detection signal tn per moire-free portion. The continuation detection signal tm per moiré fringe and the continuation detection signal tn per moiré-free portion are each a reference code mark continuation signal tmo per moiré fringe. Only when the moire does not occur within the range of tno of the reference code mark continuation signal per part, the identification value of the code mark in the data recording medium corresponding to the continuation detection signal or their combination continuation detection signal This is a method for reading data from a data recording medium, characterized by reading data.

According to a fifth aspect of the present invention, a fine parallel line pattern or an orthogonal lattice line pattern having a predetermined pitch is drawn, and recording data is expressed by moiré fringes generated by irradiating light through a translucent checking sheet. In order to be able to do so, the translucent sheet has a code mark for displaying a binary or decimal numerical value obtained by extracting a fine parallel line pattern having the same or different pitch as the collation sheet, or an orthogonal lattice line pattern. A data recording medium, wherein a continuous detection signal t per one moiré fringe obtained by detecting light reception of the code mark by the photoelectric conversion means via the collation sheet.
m and the continuation detection signal tn per part where no moire is generated are within the range of the reference continuation signal tmo per moire fringe and the reference continuation signal tno per part where no moire is generated, respectively. The data recording medium is characterized in that the identification numerical data of the code mark corresponding to the continuation detection signal or a combination continuation detection signal thereof is read only when it belongs.

Next, a sixth invention relates to a light-transmitting collation sheet on which a fine parallel line pattern or orthogonal lattice line pattern of a predetermined pitch is drawn, and a fine parallel line pattern of the same or a different pitch from the collation sheet. Or a translucent data recording medium having a code mark for displaying a binary or decimal numerical value obtained by extracting an orthogonal grid line pattern so that the parallel line patterns are parallel to each other or at a predetermined angle. At the same time, moiré fringes are generated on the code mark, and the photoelectric conversion means detects the continuation detection signal tm per moiré fringe and the continuation detection signal t per moiré-free portion.
n, and the obtained continuous detection signal tm per moire fringe and the continuous detection signal tn per moire-free portion are respectively referred to as a reference code mark continuation signal tmo per moire fringe. Numerical data for identifying code marks in the data recording medium corresponding to the continuation detection signal or the combination continuation detection signal only when the signal belongs to the range of the reference code mark continuation signal tno per part where no moiré is generated. This is a method for reading data from a data recording medium, which is characterized by reading data.

(Operation) According to the data recording medium of the present invention, since data is recorded in a parallel line pattern or a grid pattern at a predetermined pitch, there is no possibility that the data is demagnetized by magnetic lines of force and cannot be read. By using the density and angle of the pattern (line) in several steps, a large amount of information data can be compactly recorded on the recording medium and identified and displayed. The contrast is improved.

Therefore, the translucent or non-transparent collation sheet from which the parallel line pattern or the orthogonal lattice line pattern is extracted, and the parallel line pattern or the orthogonal lattice line pattern having the same or different pitch from the collation sheet are extracted. And a translucent or non-transmissive data recording medium having a code mark for displaying a binary or decimal numerical value such that the parallel line patterns thereof are parallel to each other or at a predetermined angle. When a moiré fringe is generated in the code mark, a continuous detection signal tm for each moiré fringe is generated by the document conversion means.
And the continuous detection signal tn per part where moire does not occur can be clearly detected.

Therefore, the obtained continuation detection signal tm (pulse count number) per moire fringe and the continuation detection signal tn (pulse count number) per part where moire does not occur, and one preset moire fringe It is possible to compare and determine the reference code mark continuation signal tmo (pulse count number) per unit and the reference code mark continuation signal tmo (pulse count number) per part where moire does not occur.

That is, if the continuation detection signals tm and tn obtained according to the present invention belong to the range of the preset reference code mark continuation signals tmo ± Δt and tno ± Δt, respectively, the previously stored reference codes From the numerical data correspondence memory table corresponding to the mark continuation signal, the continuation detection signal tm, tn or the combination continuation detection signal tm +
The identification numerical data of the code mark corresponding to tn can be read, and the recorded data of the code mark can be clearly read.

According to the data reading method of the present invention, the projection parallel line pattern of the collation sheet and the observation parallel line pattern of the recording medium are superimposed to generate moire fringes. Since the data on the recording medium (code mark) is read, there is no danger of data loss,
Also, the numerical data represented by the code mark can be changed by the way of drawing the lines (adjustment of pitch, angle, width, shading, color tone, etc.) in the rectangular or square code mark. Can be increased, and the storage capacity and storage capacity of identification data in a limited small space such as a card can be increased.
The confidentiality of the data is increased, making forgery difficult.

(Embodiments) Hereinafter, embodiments of a data recording body and a method of reading data from the data recording body according to the present invention will be described with reference to the drawings.

FIG. 1 shows a cart as a data recording medium according to an embodiment of the present invention. FIG. 1 (a) shows an interval in which one or several rectangles (rectangles or squares) 2a to 2d of the same size are provided on the surface of a card 1. (Space). (B) depicts a code mark 2 in which a plurality of units are arranged at intervals on a surface of the card 1 where a mark in which two rectangles 2a and 2b of the same size are continuously arranged without an interval is defined as one unit. (C) depicts a code mark 2 in which four rectangles 2a to 2d are continuously arranged vertically, horizontally, and without a space on the surface of the card 1, and the adjacent boundary between them is a line. It may be divided by a dark-colored straight line having a width different from that described above, or may not be divided as described above.

Each of the squares 2a to 2d of the code mark 2 is determined by whether or not a large number of fine parallel line patterns (hereinafter, referred to as parallel lines) are formed or not. 2a to 2d are represented as identification code marks.

For example, the square 2a displays the first digit of the binary system by applying a line. The square 2b displays the second digit of the binary system by applying a line. Further, the square 2c displays the third digit of the binary number by applying a line. Similarly, the square 2d can display the fourth digit of a binary number by applying a line.

Further, as another example, the square 2a represents a decimal value 1, 0, the square 2b represents a decimal value 2, 0, and the square 2c represents a decimal value 4, 0. The square 2d
Represents the decimal number 8,0. Therefore, code mark 2
By drawing arbitrary squares 2a to 2d among the square lines, numerical data from 0 to 15 can be represented by the code mark 2.

When the parallel lines are applied to the squares 2a to 2d of the code mark 2 of the card 1, the angles and pitches of the parallel line patterns (line) applied to the squares 2a to 2d may be the same,
It may be formed differently.

FIG. 2 shows a case where four blocks of squares 2a to 2d are provided vertically and horizontally as one square mark area.
FIG. 2A shows a code mark 2 in which all the lines of the squares 2a to 2d are drawn at different pitches in the same direction. FIG. 2B shows the pitch and angle of the lines of the squares 2a to 2d. Are code marks 2 provided differently. 2 (c) to 2 (f) are code marks in which parallel lines having the same pitch are drawn in the same vertical direction on different squares.

FIG. 3 shows a collation sheet 3 (line screen) in which a single line (opaque black line or transparent or opaque appropriately colored line) is formed on a transparent base (film, plate) at a single pitch. A pitch different from or the same as the pitch of each line in each of the squares 2a to 2d of the code mark 2 applied to the card 1 (the code mark 2 of the data recording medium).
(Which can be used when the angle is set to intersect with the line).

For example, when the collation sheet 3 is overlaid on the card 1 on which the code mark 2 is formed in FIG. 2 (a) and the collation sheet 3 (screen) is irradiated with light L, the square 2a
.About.2d have different numbers of moire fringes (for example, about 2 to 7 moire fringes in a square 2a or 2b or 2c or 2d). Further, by superimposing the collation sheet 3 on the code mark 2 in FIG. 2B, moire fringes m having different pitches and angles are generated. Further, by superimposing the collation sheet 3 on the code marks 2 of FIGS. 2C to 2D, moire fringes m having the same pitch are generated in squares at different positions in the vertical direction.

FIG. 5 is a plan view for explaining moire fringes m generated in the vertical direction when the lines of the collation sheet are superimposed on the lines of the code mark 2 in parallel.

The moire fringes m are received by the photoelectric conversion unit.
In addition, the width of the light transmitting portion with respect to the width of the light opaque portion (black portion or light absorbing portion or colored transmitting portion) of the line drawn on the square code mark 2 or the collation sheet 3 of the card 1 is 1: 1.
It is desirable to form the same width or wider than 1: 1.5.

The linear shape can be colored black, red, blue, yellow, green, etc. by using a printing method, a photographic method, and a dyeing method. Further, if the line of the mark and the line of the screen (collation sheet) are unified to the same color, the identification and measurement of the moire fringes generated by the collation can be easily performed.

As described above, when reading data recorded on the card 1, the collation sheet 3 is loaded into the reader and used.

The collation sheet 3 is a support frame 4 of the reading device shown in FIG.
The guide frame 5 is supported by the support frame 4 and guides the card 1 directly. The collation sheet 3
It is formed of a translucent glass plate, and has a pitch different from or the same as that of the lines forming the code mark 2. Then, the code mark 2 of the card 1 is superimposed on the collation sheet 3 (screen). However, when the same pitch is used for the line of the collation sheet 3 and the line of the code mark 2, the angle between the line of the collation sheet 3 and the line of the code mark 2 intersects and overlaps. The guide projections 5 or the collation sheet 3 are set in such a manner that moire is generated by the intersection of the lines. or,
The collation sheet 3 is mounted on the support frames 4, 4 with the intersection angle of the collation line direction of the collation sheet 3 with respect to the guide direction of the guide protrusion 5 set to an appropriate angle.

Card 1 conveyed along this collation sheet 3
Is guided by the guide projection 5 and sent by the pinch roller 6. A light source and a photoelectric conversion unit (not shown) are disposed below the collation sheet 3, and light is emitted from the light source toward the collation sheet 3, and the moire fringes m (density) generated on the collation sheet 3 are provided. (For example, black stripes) are received by the photoelectric conversion means.

As the photoelectric conversion means, a detection signal of reflected light of the moire fringes m is obtained by a linear CCD. This detection signal is input to comparison means (not shown). The comparing means includes a reference code mark continuation signal (for example, tlo, tmo, tno, tmo + tno, which will be described later, or ±
A signal (a numerical value obtained by adding Δt (allowable value)) is input, and the detection signal from the photoelectric conversion unit is compared with the reference signal.

The comparison determination method is, for example, as shown in FIG.
The moiré fringe is detected by the CCD, and a continuation (continuous) detection signal tm of the moiré detection voltage value V (a count number continuously counted by a high-frequency or low-frequency pulse counter or a clock pulse counter) is measured. Moiré stripes at the same time
The width of the line 1 in the portion n where the image does not occur (the portion of the document having a low density, for example, white or transparent) is also detected by the CCD, and the continuous detection signal tl of each line 1 (however, the moire fringe is detected by the pulse counter). The detection signal tl at a portion close to the boundary between m and the portion n where moiré does not occur has a value larger than tl at the portion n where moiré does not occur) and a repetition continuation detection signal tn of the signal tl Is measured.

Here, with respect to one moire pattern, the continuous detection signal per one moire fringe m is tm, and the continuous detection signal per moire fringe portion n where no moire fringe m occurs is t.
n, and the continuous detection signal per one moiré (m + n) is tm + tn. Further, each of the continuation detection signals t
The reference code mark continuation signals tlo, tmo, tno, tmo + tno for l, tm, tn, and tm + tn, or a reference code mark continuation signal (Δt ≧ 0) obtained by adding ± Δt (permissible value) to those values, are set in advance. It is something to keep. Then, when the number of detected moire (m + n) is one, (tm + tn), when two moirés (m + n) are detected, 2 × (tm + tn), when three, 3 × (tm + tn), and when P, P × (tm + tn)
tn) is a continuation detection signal. Subsequently, as shown in FIG. 6 (b), each of the moiré measured continuous detection signals t
If m, tn, and tm + tn fall within the preset range of the reference code mark continuation signal, the pre-stored numerical data correspondence memory table corresponding to each of the reference code mark continuation signals is used. The identification numerical data of the code mark 2 corresponding to the continuation detection signal or their combination continuation detection signal is read.

In FIG. 4, the card 1 and the collating sheet 3 are superimposed in close or close contact with each other, but this is not always necessary. For example, separately from the CCD, the card 1 The first code mark 2 may be formed into an image on the line drawing surface of the collation sheet 3 disposed in the middle of the optical system, and the image forming light may be received by the photoelectric conversion unit via the optical system. Alternatively, the code mark 2 of the card 1 and the parallel line of the collation sheet 3 may be received by the photoelectric conversion unit through separate optical systems.

In the above-described determination method, the reference code mark continuation signal (count value to or to ± Δt) for code mark identification determination is set in, for example, several stages (K stages), thereby providing several types (K types). It is possible to detect moiré fringes expressed by the code marks 2 depicting different variations of lines, and identify the marks based on the respective reference code mark continuation signal values.

When the rectangles (squares) in one unit code mark of the code mark 2 are arranged at an interval, the interval (a blank portion having no lines) is detected by the CCD, and the area of each rectangle is detected. When each rectangle continuously forms one unit code mark, the size of one unit rectangle is scanned by pulse count scanning and divided by the number of rectangles in the scanning direction. be able to.

Although a card is used as the data recording medium in the above embodiment, a ticket such as a paper ticket, a printed matter, a resin molded product, a label, or the like may be used.

(Effects of the Invention) According to the data recording medium and the method of reading data from the data recording medium according to the present invention, there is no possibility that reading is impossible due to demagnetization by lines of magnetic force. By using the angle in several steps, a large amount of information data can be compactly recorded in the recording medium and can be identified and displayed. In addition, the data recording medium according to the present invention has a parallel line with the code mark and the collating sheet. Since a pattern or an orthogonal grid line pattern is used, the contrast of moiré generated as compared with a linear pattern formed by a set of halftone dots becomes better, and clear recording data can be read by the reading method of the present invention. Become. Therefore, the recorded data is hardly lost, the confidentiality of the data is increased, and it is difficult to forge data of securities such as cards.

[Brief description of the drawings]

FIG. 1 is a plan view of a card shown in an embodiment of the present invention. FIG. 2 is a plan view illustrating an embodiment of the code mark of the present invention. FIG. 3 is a plan view of a collation sheet (projection screen). FIG. 4 is an explanatory diagram in the case of reading the code mark of the card of FIG. 1 using a collation sheet (projection screen). FIG. 5 is a plan view for explaining an example of moiré generated by overlapping a code mark and a collation sheet. FIG. 6 is an explanatory diagram of a moire detection signal. 1 ... Card 2 ... Code mark 2a, 2b, 2c, 2d ... Binary digit display field 3 ... Sheet for verification (projection screen)

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-57-10885 (JP, A) JP-A-1-222393 (JP, A) JP-A-53-73026 (JP, A) JP-A-58-58 24497 (JP, A) JP-A-58-25997 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G06K 19/00-19/18 G06K 7/10

Claims (6)

(57) [Claims] A fine parallel line pattern or an orthogonal lattice line pattern having a predetermined pitch is drawn and moiré fringes generated by irradiating light through a translucent collating sheet are used to express recording data. A non-translucent sheet having a data mark having a code mark for displaying a binary or decimal numerical value depicting a fine parallel line pattern or an orthogonal lattice line pattern having the same or different pitch as the collation sheet. Continuation detection signal tm per moiré fringe, which is obtained by detecting light reception of the code mark by the photoelectric conversion means via the collating sheet.
And the continuation detection signal tn per part where no moire is generated belongs to the range of the reference continuation signal tmo per moire fringe and the reference continuation signal tno per part where no moire is generated, respectively. A data recording medium characterized in that the identification numerical data of the code mark corresponding to the continuation detection signal or their combination continuation detection signal is read only in the case. 2. A light-transmitting collation sheet on which a fine parallel line pattern or orthogonal lattice line pattern of a predetermined pitch is drawn, and a fine parallel line pattern or a quadrature of the same or different pitch from the collation sheet. A non-translucent data recording medium having a code mark for displaying a binary or decimal numerical value obtained by extracting a grid line pattern is overlapped with the non-transmissive data recording body so that the parallel line patterns thereof are parallel to each other or at a predetermined angle. Moire fringes are generated on the code mark, and the continuous detection signal tm per moire fringe and the continuation detection signal tn per moire-free portion are detected by the photoelectric conversion means. Continuous detection signal tm per line
The continuation detection signal tn per part where no moire is generated is the range of the reference code mark continuation signal tmo per moire fringe and the reference code mark continuation signal tno per part where no moire is generated. Data reading method for reading data from a data recording medium, the method further comprising: reading numerical identification data of a code mark in the data recording medium corresponding to the continuation detection signal or a combination continuation detection signal thereof only when the data recording medium belongs to. 3. A printing method according to claim 1, wherein fine parallel line patterns or orthogonal grid line patterns having a predetermined pitch are drawn and moiré fringes generated by irradiating light through a translucent collating sheet are used. A non-translucent sheet having a data mark having a code mark for displaying a binary or decimal numerical value obtained by extracting a fine parallel line pattern or an orthogonal grid line pattern having the same or different pitch from the reference sheet. Continuation detection signal tm per moiré fringe, which is obtained by detecting light reception of the code mark by the photoelectric conversion means via the collating sheet.
And the continuation detection signal tn per part where no moire is generated belongs to the range of the reference continuation signal tmo per moire fringe and the reference continuation signal tno per part where no moire is generated, respectively. A data recording medium characterized in that the identification numerical data of the code mark corresponding to the continuation detection signal or their combination continuation detection signal is read only in the case. 4. A non-transparent collation sheet on which a fine parallel line pattern or orthogonal lattice line pattern with a predetermined pitch is drawn, and a fine parallel line pattern with the same or different pitch from the collation sheet. A translucent data recording medium having a code mark for displaying a binary or decimal numerical value obtained by extracting an orthogonal grid line pattern is overlapped with the transparent data recording medium so that the parallel line patterns of the two are parallel to each other or at a predetermined angle. Moire fringes are generated on the code mark, and the continuous detection signal tm per moire fringe and the continuation detection signal tn per moire-free portion are detected by the photoelectric conversion means. Continuous detection signal tm per line
And the continuation detection signal tn per part where no moiré is generated are the reference code mark continuation signal tmo per moire fringe and the tno of the reference code mark continuation signal per part where no moiré is generated, respectively. A method of reading data from a data recording medium, wherein the identification data of the code mark in the data recording medium corresponding to the continuation detection signal or the combination continuation detection signal is read only when the data belongs to the range. 5. A printing method in which fine parallel line patterns or orthogonal lattice line patterns of a predetermined pitch are drawn and moiré fringes generated by irradiating light through a translucent collation sheet so that recording data can be expressed. , Translucent sheet,
A fine parallel line pattern or orthogonal grid line pattern having the same or different pitch as the collation sheet is extracted 2
A data recording medium having a code mark for displaying a decimal or a decimal value, wherein one moiré fringe obtained by detecting light reception of the code mark by the photoelectric conversion means via the collation sheet. And the continuation detection signal t per part where no moiré occurs
n is the reference continuation signal tmo per moiré stripe
The identification numerical data of the code mark corresponding to the continuation detection signal or their combination continuation detection signal is read only when the continuation detection signal or the combination continuation detection signal belongs to the range of the reference continuation signal tno per part where no moiré is generated. A data recording medium characterized by the following. 6. A light-transmitting collation sheet on which a fine parallel line pattern or orthogonal lattice line pattern with a predetermined pitch is drawn, and a fine parallel line pattern or a quadrature with the same or different pitch from the collation sheet. A translucent data recording medium having a code mark for displaying a binary or decimal numerical value obtained by extracting a grid line pattern is superimposed on a transmissive data recording medium such that the parallel line patterns are parallel to each other or at a predetermined angle. A moire fringe is generated in the mark, and a continuous detection signal tm per moire fringe and a continuation detection signal tn per moire-free portion are detected by the photoelectric conversion means. The continuation detection signal tm per line and the continuation detection signal tn per portion where no moiré is generated are respectively the reference code mark continuation signal tmo per moire fringe and the moiré. Only when the signal belongs to the range of the reference code mark continuation signal tno per part that has not been generated, the identification numerical data of the code mark in the data recording medium corresponding to the continuation detection signal or their combination continuation detection signal is read. A method for reading data from a data recording medium, characterized in that: