WO1994027242A1 - Optical mark reader for latent image mark - Google Patents
Optical mark reader for latent image mark Download PDFInfo
- Publication number
- WO1994027242A1 WO1994027242A1 PCT/JP1994/000778 JP9400778W WO9427242A1 WO 1994027242 A1 WO1994027242 A1 WO 1994027242A1 JP 9400778 W JP9400778 W JP 9400778W WO 9427242 A1 WO9427242 A1 WO 9427242A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- latent image
- image mark
- optical
- mark
- light
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10554—Moving beam scanning
- G06K7/10594—Beam path
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/12—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using a selected wavelength, e.g. to sense red marks and ignore blue marks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S283/00—Printed matter
- Y10S283/901—Concealed data
Definitions
- the present invention relates to a latent image mark optical reading device that emits infrared rays to a latent image mark including a phosphor and optically detects light emitted from the latent image mark. More specifically, the present invention relates to a handy type optical reading apparatus, in which the optical reading apparatus is brought into contact with or close to an object such as a product having the latent image mark, and the information of the latent image mark is read.
- the present invention relates to an arrangement relationship between a light projecting member and a light receiving member of an optical reader for reading.
- a printing ink containing carbon black is generally used, and a barcode is printed on the surface of the paper with the ink, and the barcode is printed on a portion where the barcode is printed.
- a barcode reader optically detects the difference in light reflectance from the part, and reads the code information of the barcode.
- This reflective bar code is printed on the surface of a product or the like, so that the appearance of the product or the like is impaired. It has the drawback that the difference is small and causes reading errors.
- FIG. 12 is a view for explaining a conventional optical reader of this type.
- Ba A latent image mark such as a code is printed on a mark carrier 101 such as a product or a part.
- the latent image mark 100 contains phosphor fine particles, and light for exciting this phosphor is radiated from the light projecting member 103, and accordingly, from the latent image mark 100. Fluorescent light is emitted, and the fluorescent light is emitted by the light receiving member 104 so that the code information of the latent image mark 100 is optically read.
- the present inventors have found that the intersection angle of the optical axis of the light projecting member 103 and the light receiving member 104 of the optical reading device and the latent image mark 100 of the mark carrier 101 are different. It has been clarified that the state of the printed surface greatly affects the reading accuracy.
- the optical reading device is mechanically fixed at a predetermined position, a latent image mark 100 is printed on a mark carrier 101 such as paper, for example, with a flat surface, and the mark carrier 101 is optically printed.
- a guide member provided in the reader, the distance between the light emitting member 103 and the latent image mark 100 and the distance between the light receiving member 104 and the latent image mark 100 are always constant. In this case, as shown in FIG. 12, even if the crossing angle 0 of the optical axis of the light projecting member 103 and the light receiving member 104 is 45 ° to 60 °, the latent image mark 100 Can be read relatively accurately.
- the optical reading device is a hand-operated type, the reading position of the light receiving member 104 with respect to the latent image mark 100 varies, or the optical reading device detects the position of the latent image mark 100 with respect to the surface of the latent image mark 100.
- the opening surface is slanting or moving.
- the surface state of the mark carrier 101 on which the latent image mark 100 is printed is irregular, such as a confectionary bag. If there is a part or part with a curved surface or a step, the distance between the light emitting member 103 and the latent image mark 100 and the distance between the light receiving member 104 and the latent image mark 100 The distance will be uneven.
- the intersection angle 0 of the optical axis of the light projecting member 103 and the light receiving member 104 becomes 45 ° as in the related art. ⁇ 60.
- the code information of the latent image mark 100 could not be read accurately, causing false detection.
- an object of the present invention is to solve the above-mentioned drawbacks and provide a highly reliable latent image mark optical reading device capable of accurately reading code information of a latent image mark.
- a projection device that emits light having a wavelength that excites the phosphor on a latent image mark surface that contains the phosphor and has desired information.
- An optical member, and a light receiving member for receiving fluorescence emitted from the latent image mark surface, and a latent image mark readable range is defined based on a point where an optical axis of the light projecting member and an optical axis of the light receiving member intersect. It is configured such that the intersection angle between the two optical axes is restricted to 40 ° or less.
- the present invention narrows the intersection angle between the optical axis of the light projecting member and the optical axis of the light receiving member on the latent image mark to 40 ° or less to thereby reduce the light projecting member and the light receiving member.
- the effect of the irregular distance between the image and the latent image mark can be minimized.
- it is suitable for handy optical readers, and it can read not only those with flat surfaces but also irregular surface irregularities, curved surfaces, and mark carriers with steps.
- An optical reading device that can be obtained is obtained.
- FIG. 1 is a plan view in which a part of a handy type optical reader according to an embodiment of the present invention is cut away,
- FIG. 2 is a cross-sectional view of the optical reader of FIG.
- FIG. 3 is a plan view showing a state in which an upper frame of a light receiving unit used in the optical reader of FIG. 1 is removed.
- FIG. 4 is a sectional view of the light receiving unit of FIG.
- FIG. 5 is a schematic diagram for explaining the optical system of the optical reader of FIG. 1
- FIG. 6 is a schematic diagram for explaining the optical system of the optical reader of FIG. 1
- FIG. FIG. 4 is a characteristic diagram showing a relationship between a latent image mark position and an output state of a light receiving element.
- FIG. 8 is a characteristic diagram showing a relationship between an optical axis crossing angle of the light emitting element and the light receiving element and a readable distance of the latent image mark.
- FIG. 9 is a diagram showing an output state of the optical reader when the mark carrier surface is flat
- FIG. 10 is a diagram showing an output state of the optical reading device when the mark carrier surface is uneven
- FIG. 11 is a diagram showing an output state of the optical reading device when the mark carrier surface is curved
- FIG. 12 is a schematic diagram of a conventional optical reading device.
- FIG. 1 is a plan view of a part of the handy type optical reader according to the above embodiment
- FIG. 2 is a sectional view of the optical reader
- FIG. 3 is a light receiving unit used in the optical reader.
- FIG. 4 is a cross-sectional view of the light receiving unit
- FIGS. 5 and 6 are schematic diagrams for explaining an optical system of the optical reading device.
- the handy type optical reader includes an upper case 1, a lower case 2, an aperture frame 3, a light projecting element 4, a mirror 5, and an imaging lens group 6. , An optical filter 7, a light receiving element 8, a control board 9, and a switch 10.
- the upper case 1 and the lower case 2 are formed in a shape that is easy to hold as shown in FIG. 1, and the switch 10 is installed at a position where the optical reader can be operated while being held by hand. . '
- the light projecting element 4 is an array having a large number of LED elements arranged in a line, and a lens body 11 is provided on the light projecting surface side.
- the light emitting element 4 is supported on a printed circuit board 12, and the printed circuit board 12 is accurately fixed to the lower case 2, though not shown.
- the control board 9 and the print board 12 are electrically connected by a signal line 13.
- the array-like light projecting element 4 is fixed near the aperture detection surface of the optical reader, and emits light, for example, to a bar code-like latent image mark 15 printed on the surface of the mark carrier 14. Is irradiated. As shown in FIGS. 2 and 6, the optical axis of the light emitting element 4 should intersect at 15 ° with the normal to the surface to be detected (in the case of a flat surface) on which the latent image mark 15 is formed. In addition, the light emitting element 4 is fixed.
- Infrared rays are emitted from the light emitting element 4, thereby exciting the phosphor fine particles mixed in the latent image mark 15, and thereby having infrared rays having a different center wavelength than the infrared light from the light emitting element 4. (Fluorescence).
- This fluorescent light The light is reflected by the mirror 5 arranged on the normal line of the surface 15 and is received by the light receiving element 8 through the imaging lens group 6 and the optical filter 7.
- the optical filter 7 has an optical characteristic of blocking infrared rays emitted from the light projecting element 4 and transmitting infrared rays emitted from the latent image mark 15.
- the optical filter is composed of, for example, a single crystal substrate of indium phosphide (InP).
- the light receiving element 8 is formed of an array in which a large number of CCDs are arranged in one row.
- the detection signal from the light receiving element 8 is input to the control board 9 and, after signal processing and the like, is input to a personal computer (not shown) through the cable 16.
- the mirror 5, the imaging lens group 6, and the light receiving element 8 are sandwiched and positioned between the upper frame 17 and the lower frame 18 as shown in FIGS. 3 and 4 so as to maintain appropriate intervals.
- the latent image mark 15 mounted in the lower cases 1 and 2 is composed of fluorescent fine particles and a binder having a property of transmitting infrared rays and dispersing and holding the fluorescent fine particles.
- Examples of the phosphor include neodymium (Nd), ytterbium (Yb), europium (Eu), thulium (Tm), and praseodymium.
- inorganic compounds contained in the mother specifically, there is NdP 5 0 14, L i NdP 4 0 12, NaY 0. 69 Yb 0. 3 inorganic compound such as E r 0 .o F 4.
- an inorganic compound represented by the following general formula can also be used.
- Ln in the formula represents at least one element selected from the group consisting of Bi, Ge, Ga, Gd, In, La, Lu, Sb, and Sc.
- A represents one or more elements selected from the group K. Na, and M represents one or more elements selected from the group W and M0.
- D is at least one element selected from the group consisting of A 1 and Cr.
- A represents one or more elements selected from the group of K, Na.
- ⁇ ' is one or more elements selected from the group of L i. ⁇ , Na,
- M represents one or more elements selected from the group of W and M0.
- an inorganic compound represented by the following general formula can also be used.
- E in the formula is one or more elements selected from the group of L i, Na, K, Rb, C s,
- F in the formula represents one or more elements selected from the group of Sc, Y, La, Ce, Gd, Lu, Ga, In, Bi, and Sb.
- X and y in the formula are numerical values in the following range. 0.05 ⁇ x ⁇ 0.999
- At least one element selected from the group of Y, La, Gd, and Bi, and phosphates, borates, molybdates, tungstens, etc., containing Yb Oxygen salts, specifically, inorganic compounds having the following general formula can also be used.
- a in the formula is one or more elements selected from the group of Li, Na, K, Rb, and Cs, and is not necessarily required.
- X is a number in the range from 0.01 to 0.99
- y is a number in the range 2 to 5
- z is a numerical value in the range of 7-14.
- the content of the phosphor fine powder is suitably from 10 to 80% by weight, particularly preferably from 25 to 70% by weight. If the content of the phosphor fine powder is less than 10% by weight, the emission output of the latent image mark 15 is too weak, while if the content of the phosphor fine powder exceeds 80% by weight, printing is difficult. There is a fear that the latent image mark 15 may be peeled off due to weak adhesion.
- the binder may be a non-solvent type such as an ultraviolet curable resin, a solvent type such as a polyurethane, or a polyvinyl alcohol (PVA). Any water-soluble type can be used, and it is appropriately selected according to the printing method, the material of the detection target, and the like. In addition, a plasticizer, a surfactant, and the like are appropriately added as needed.
- a non-solvent type such as an ultraviolet curable resin, a solvent type such as a polyurethane, or a polyvinyl alcohol (PVA).
- PVA polyvinyl alcohol
- Any water-soluble type can be used, and it is appropriately selected according to the printing method, the material of the detection target, and the like.
- a plasticizer, a surfactant, and the like are appropriately added as needed.
- the focal length of the lens body 11 is designed to be slightly ahead of the detection opening so that it can be read.
- the intersection angle 0 between the optical axis of the light emitting element 4 and the optical axis of the light receiving element 8 on the latent image mark 15 is set to 15 ° as described above, and 11 If the position where the latent image mark 15 is located at the focal length of 1 is the latent image mark position O mm (reference position), and the latent image mark 15 is moved closer to the device side from that position or away from it, The change in the output voltage of the light-receiving element 8 was measured, and the results are shown in FIG.
- the horizontal axis represents the position of the latent image mark 15
- the left vertical axis represents the output voltage value of the light receiving element 8
- the right vertical axis represents the output voltage of the light receiving element 8 when the latent image mark position is 0 mm.
- the output efficiencies in the case of 0 are shown respectively.
- the readable distance is about +10 mm, which is about +10 mm at the position where the output efficiency is 50%, that is, about the reference position. It is in the range of 0 mm (about 20 mm).
- the readable range of the latent image mark is formed so as to start from the outer end face of the detection opening for emitting and receiving light and to extend about 2 Omm in a direction away from the opening.
- FIG. 8 is a diagram summarizing the measured readable distance (the position where the output efficiency of the light receiving element 8 is 50%) when the crossing angle 6 is variously changed.
- the readable distance is extremely reduced as the intersection angle 6 increases.
- the crossing angle 0 is 45 ° as in the past, the maximum readable distance is 5 mm ( ⁇ 2.5 mm) or less, and when the surface is uneven as in the confectionery bag described above, or Reading the latent image mark 15 on a curved surface with a short radius of curvature is uncertain.
- the height difference in the natural state of the surface of the product is about 6 mm ( ⁇ 3 mm) on average, such as a confectionery bag.
- the reading distance of the latent image mark 15 is assured if the reading distance is within the range.
- the crossing angle ⁇ is 15 °
- the readable distance is 10 mm (twice that when the conventional crossing angle 0 is 45 °), and the readable distance is 20 mm (if the conventional crossing angle is 45 °). 4 times). Therefore, it is preferable that the crossing angle be 30 ° or less, but the narrowing of the crossing angle 0 means that the dimensions and dimensions of each optical system component such as the light-emitting element 4, the mirror 1, the imaging lens group 6, and the light-receiving element 8 It is desirable to restrict the crossing angle 0 to the range of 10 ° to 30 because the conditions such as arrangement become severe.
- the bar code-like latent image mark 15 with a minimum width of 0.5 mm is printed on the paper on which the mark is printed.
- Figure 9 shows the output state when the paper surface is flat.
- Fig. 10 shows the output state when the average height of the surface difference in the area where the latent image mark 15 is formed is approximately 6 mm ( ⁇ 3 mm) by forming wrinkles on the paper. It is.
- FIG. 6 is a diagram showing an output state when reading at (°) (a distance to a barcode is 6 mm).
- the present invention is also applicable to an optical reader using an ultraviolet excitation type phosphor which is excited by irradiating ultraviolet rays. It is.
- the former is advantageous in terms of security because the fluorescence is visible light, whereas the latter is not visible light. Due to the long life of the phosphor, infrared-excited phosphors can be awarded.
- the present invention provides a latent image based on a point at which the optical axis of a light emitting member (for example, the light emitting element 4) and the optical axis of a light receiving member (for example, the light receiving element 8 and the optical frame 7) intersect.
- a mark readable range is formed, and the intersection angle of the two optical axes is narrowed to 40 ° or less to make the angle narrow, so that the distance between the light emitting member and the latent image mark and the light receiving member and the latent image mark are reduced.
- the effect of uneven distance to It can be less powerful.
- it is suitable for handy optical reading devices-and it can read not only flat surfaces but also irregularly uneven surfaces, mark carriers with curved surfaces or steps, etc.
- An optical reading device with high reliability can be provided.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/367,355 US5668363A (en) | 1993-05-17 | 1994-05-13 | Optical reading apparatus for reading latent image mark |
EP94914617A EP0652529A4 (en) | 1993-05-17 | 1994-05-13 | OPTICAL BRAND READER FOR LATENT IMAGE BRAND. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5114614A JPH06325200A (ja) | 1993-05-17 | 1993-05-17 | 潜像マークの光学読取装置 |
JP5/114614 | 1993-05-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994027242A1 true WO1994027242A1 (en) | 1994-11-24 |
Family
ID=14642268
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1994/000778 WO1994027242A1 (en) | 1993-05-17 | 1994-05-13 | Optical mark reader for latent image mark |
Country Status (4)
Country | Link |
---|---|
US (1) | US5668363A (ja) |
EP (1) | EP0652529A4 (ja) |
JP (1) | JPH06325200A (ja) |
WO (1) | WO1994027242A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8968662B2 (en) | 2008-06-23 | 2015-03-03 | Freshpoint Quality Assurance Ltd. | Time temperature indicator |
US9011794B2 (en) | 2007-01-11 | 2015-04-21 | Freshpoint Quality Assurance Ltd. | Time temperature indicator |
US9448182B2 (en) | 2004-11-08 | 2016-09-20 | Freshpoint Quality Assurance Ltd. | Time-temperature indicating device |
US9835498B2 (en) | 2003-11-20 | 2017-12-05 | Freshpoint Quality Assurance Ltd. | Method and system for determining the condition of a time-temperature indicator |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6264107B1 (en) | 1997-09-26 | 2001-07-24 | Iomega Corporation | Latent illuminance discrimination marker system for authenticating articles |
US6091563A (en) * | 1997-09-26 | 2000-07-18 | Iomega Corporation | Latent illuminance discrimination marker system for data storage cartridges |
US6359745B1 (en) | 1997-09-26 | 2002-03-19 | Iomega Corporation | Latent illuminance discrimination marker system for data storage cartridges |
US6201662B1 (en) | 1998-09-25 | 2001-03-13 | Iomega Corporation | Latent illuminance discrimination marker with reflective layer for data storage cartridges |
US6181662B1 (en) | 1997-09-26 | 2001-01-30 | Iomega Corporation | Latent irradiance discrimination method and marker system for cartridgeless data storage disks |
US6028320A (en) * | 1998-01-20 | 2000-02-22 | Hewlett-Packard Company | Detector for use in a printing device having print media with fluorescent marks |
US6450634B2 (en) | 1999-01-29 | 2002-09-17 | Hewlett-Packard Company | Marking media using notches |
US6255665B1 (en) | 1999-01-29 | 2001-07-03 | Hewlett-Packard Company | Print media and method of detecting a characteristic of a substrate of print media used in a printing device |
DE10027726A1 (de) * | 2000-06-03 | 2001-12-06 | Bundesdruckerei Gmbh | Sensor für die Echtheitserkennung von Signets auf Dokumenten |
US6832729B1 (en) | 2001-03-23 | 2004-12-21 | Zih Corp. | Portable data collection device for reading fluorescent indicia |
CN108664827A (zh) * | 2017-04-02 | 2018-10-16 | 田雪松 | 一种编码信息获取方法和系统 |
CN108664826A (zh) * | 2017-04-02 | 2018-10-16 | 田雪松 | 一种编码信息读取装置 |
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JPS59121474A (ja) * | 1982-12-27 | 1984-07-13 | Toyota Tsusho Kk | 「けい」光記号識別装置 |
JPS6083184A (ja) * | 1983-10-14 | 1985-05-11 | Mitsubishi Electric Corp | バ−コ−ド読み取り方法 |
Family Cites Families (6)
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JPS539600A (en) * | 1976-07-14 | 1978-01-28 | Hitachi Ltd | Optical card reader |
US4743773A (en) * | 1984-08-23 | 1988-05-10 | Nippon Electric Industry Co., Ltd. | Bar code scanner with diffusion filter and plural linear light source arrays |
DE3507569A1 (de) * | 1985-03-04 | 1986-09-04 | Erhardt & Leimer GmbH, 8900 Augsburg | Vorrichtung zur erfassung von kennzeichnungen auf sich bewegenden kennzeichnungstraegern |
JPS6423383A (en) * | 1987-07-20 | 1989-01-26 | Empire Airport Service | Bar-code system |
US5210411A (en) * | 1990-06-29 | 1993-05-11 | Hitachi Maxell, Ltd. | Detection mark and method and apparatus for detecting mark |
US5463212A (en) * | 1992-05-07 | 1995-10-31 | Hitachi Maxell, Ltd. | Latent image forming member and method of manufacturing, latent image reading apparatus and latent image reading system |
-
1993
- 1993-05-17 JP JP5114614A patent/JPH06325200A/ja active Pending
-
1994
- 1994-05-13 US US08/367,355 patent/US5668363A/en not_active Expired - Fee Related
- 1994-05-13 WO PCT/JP1994/000778 patent/WO1994027242A1/ja not_active Application Discontinuation
- 1994-05-13 EP EP94914617A patent/EP0652529A4/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59121474A (ja) * | 1982-12-27 | 1984-07-13 | Toyota Tsusho Kk | 「けい」光記号識別装置 |
JPS6083184A (ja) * | 1983-10-14 | 1985-05-11 | Mitsubishi Electric Corp | バ−コ−ド読み取り方法 |
Non-Patent Citations (1)
Title |
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See also references of EP0652529A4 * |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9835498B2 (en) | 2003-11-20 | 2017-12-05 | Freshpoint Quality Assurance Ltd. | Method and system for determining the condition of a time-temperature indicator |
US9448182B2 (en) | 2004-11-08 | 2016-09-20 | Freshpoint Quality Assurance Ltd. | Time-temperature indicating device |
US9011794B2 (en) | 2007-01-11 | 2015-04-21 | Freshpoint Quality Assurance Ltd. | Time temperature indicator |
US10145826B2 (en) | 2007-01-11 | 2018-12-04 | Freshpoint Quality Assurance Ltd. | Time temperature indicator |
US11280772B2 (en) | 2007-01-11 | 2022-03-22 | Freshpoint Quality Assurance Ltd. | Time temperature indicator |
US8968662B2 (en) | 2008-06-23 | 2015-03-03 | Freshpoint Quality Assurance Ltd. | Time temperature indicator |
Also Published As
Publication number | Publication date |
---|---|
EP0652529A4 (en) | 1998-12-09 |
US5668363A (en) | 1997-09-16 |
EP0652529A1 (en) | 1995-05-10 |
JPH06325200A (ja) | 1994-11-25 |
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