USRE36251E - Laser bar code reader measuring phase of the pulse laser to determine the distance - Google Patents
Laser bar code reader measuring phase of the pulse laser to determine the distance Download PDFInfo
- Publication number
- USRE36251E USRE36251E US09/004,920 US492098A USRE36251E US RE36251 E USRE36251 E US RE36251E US 492098 A US492098 A US 492098A US RE36251 E USRE36251 E US RE36251E
- Authority
- US
- United States
- Prior art keywords
- signal
- distance
- scanner
- code
- laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
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
- G06K7/10821—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 further details of bar or optical code scanning devices
- G06K7/10851—Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device
-
- 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
- G06K7/10564—Light sources
- G06K7/10574—Multiple sources
-
- 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
- G06K7/10564—Light sources
- G06K7/10584—Source control
-
- 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
- G06K7/10792—Special measures in relation to the object to be scanned
- G06K7/10801—Multidistance reading
- G06K7/10811—Focalisation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K2207/00—Other aspects
- G06K2207/1018—Source control
Definitions
- the present invention relates to a reader device (hereinafter termed "laser scanner” for the sake of brevity) for reading characters with different reflectance values, such as for example bar codes.
- laser scanner a reader device for the sake of brevity
- the lasers related to the various distances are activated sequentially and alternately, one for each scanning operation, and if one scan is found to contain the code, all subsequent scans are performed by the same laser, until the code remains present; once this situation ends, scanning resumes with cyclic alternation of the lasers.
- Another known method entails the activation of the laser related to the reading distance by measuring, by means of a barrier of photocells external to the scanner, the height of the object that bears the code to be read.
- the actual scan rate is equal to the real scan rate divided by the number of lasers being scanned;
- the second method requires the use of external photocells and is furthermore effective only if the objects on which the code is placed have a regular shape.
- a defect of both systems is that only one focusing is possible during an individual scan. In other words, it is not possible to simultaneously read two codes that are aligned but located on planes that are at different distances from the scanner.
- the aim of the present invention is to provide a scanner for reading characters with different reflectance values, such as for example bar codes, which can activate, automatically and in real time, the laser focused at the distance that matches the instantaneous position of the spot at any time during the scan.
- FIG. 1 is a block diagram of a scanner with two laser units
- FIG. 2 is a block diagram of a modified detail of the scanner of FIG. 1;
- FIG. 3 is a diagram of a detail of the scanner of FIG. 1;
- FIG. 4 is a block diagram of a scanner provided with one laser unit
- FIG. 5 is a block diagram of a scanner with three laser units
- FIG. 6 is a diagram of a detail of the scanner of FIG. 5.
- the scanner comprises two perfectly identical laser beam source units 1 and 2; each unit is composed of a power supply circuit 1a, 2a and of a modulating circuit 1b, 2b that activates modulated emission only when a high-frequency modulating signal is present at its input.
- Each source unit 1, 2 furthermore includes a laser diode 1c, 2c connected to the output of the modulating circuit 1b, 2b and an optical assembly 1d, 2d for variable collimation, such as to allow the focusing of the emitted beam at different distances.
- one assembly focuses the emitted beam onto a nearer region or reading field and the other assembly focuses it onto a more distant reading field.
- the two reading fields have an overlapping region in order to ensure the necessary continuity of the region to be scanned.
- the beam 3 arriving from the optical assembly 1d is sent through a semitransparent mirror 4.
- the beam 5 from the optical assembly 2d is reflected by the mirror 6 onto the semitransparent mirror 4; the mirrors 4 and 6 are orientated so that the beams 3 and 5 that leave the mirror 4 have the same direction, so as to produce a unidirectional beam 7.
- the unidirectional beam 7 is directed onto a polygonal rotor 9 through the hole of a mirror 8 arranged obliquely with respect to said beam.
- Said rotor 9 comprises multiple peripheral mirrors which, by means of the rotation of the rotor, scan a preset reading area in which the characters to be read, e.g. a bar code, are located.
- the beam reflected by the reading area is reflected by said rotor 9 and by the mirror 8 towards an optical receiving system 10 that concentrates the light on a photoelectric sensor 11 which converts the light signal into an electric signal.
- the amplifier 12 amplifies said electric signal until it reaches a level sufficient for subsequent processing.
- the signal at the output of the amplifier 12 is sent to a phase demodulator 13.
- the modulation signal is produced by a local oscillator 14 and is sent to the laser unit 1 (signal 15) or to the laser unit 2 (signal 16), depending on the position assumed by a selector 17.
- the modulating signal produced by the local oscillator 14 has a sinusoidal plot that follows the rule cos( ⁇ o t) at a high frequency, for example 40 MHz.
- the selector 17 comprises an analog switch 18 which, depending on a signal that arrives from a decision circuit 19, connects the oscillator 14 to the laser unit that is focused on the distance of the bar code.
- a signal Acos( ⁇ o t+ ⁇ ) is obtained, where A is the amplitude of the signal indicating reflectance, ⁇ o is the pulse of the modulating signal and ⁇ is the phase shift angle of the received signal with respect to the modulating signal.
- the modulating signal cos( ⁇ o t) arriving from the local oscillator 14 and the signal at the output of the amplifier 12, Acos( ⁇ o t+ ⁇ ), are sent to a mixer 20 of the phase demodulator 13, which is in practice a synchronous demodulator that can provide an output signal A cos ⁇ .
- the same signal Acos( ⁇ o t+ ⁇ ) is sent to an amplitude demodulator 21 that extracts its amplitude characteristic A.
- Analog signals are present at the output of the mixer 20 and of the amplitude demodulator 21; these signals, sent to am analog divider 22, provide, at the output thereof, a signal which is proportional to cos ⁇ .
- the signal A is furthermore sent to a digitizer 23, where it is converted into pulses the duration of which corresponds to the variations in reflectance.
- the output of the digitizer 23 is connected to a decoder 24 which receives the signal cos ⁇ from the analog divider 22.
- the decoder 24 also receives a signal processed by an angular position sensor 25 which is associated with the rotor 9.
- the sensor 25 detects the beginning of each scanning step and allows the decoder to provide in output the information related to the angular position (distance) of the reflectance area (represented by the signal cos ⁇ at the output of the analog divider 21) and to the variations (represented by the signal A at the output of the digitizer 23) in relation to the angular position of the beam that scans the reading area.
- the laser units 1, 2 are preset to focus the emitted beams onto two adjacent fields which form the reading area by mutually integrating along an overlapping region.
- the signal cos ⁇ is sent not only to the decoder 24 but also to the decision circuit 19, which is substantially a comparator that compares said signal cos ⁇ with a reference value corresponding to the region of separation (overlap) between the two focusing fields of the laser units 1, 2.
- the signal at the output of the circuit 19 presets the selector 17 for the activation of one or the other of the laser units 1, 2.
- the described scanner is particularly suitable for reading the bar codes 26 applied to products meant for distribution. If the local oscillator 14 emits a 40-MHz modulating signal having a corresponding wavelength of 7.5 meters, the return signal reflected by the bar code 26 will be back in phase with the emitted signal every 7.5 meters.
- the useful working field is halved and then again halved by providing only a phase shifting up to 180°.
- a working field of approximately 1.8 meters is thus obtained: such a field is four times shorter than the wavelength and constitutes a wide enough value within which the codes to be read must be kept with respect to the scanner.
- the laser unit 1 is preset to focus onto a reading field closer to the scanner than the field for which the laser unit 2 is preset. If the selector 17 is in the position for connecting the oscillator 14 to the laser unit 1 and the bar code 26 is in the reading field of the laser unit 1, the spot of the beam emitted by the laser unit 1 is correctly focused and at the output of the amplifier 12 a signal Acos( ⁇ o t+ ⁇ ) is obtained which, once processed by the phase demodulator 13, provides the decision circuit 19 with a signal which, when compared with the reference signal, allows the circuit 19 to process a signal that can keep the selector 17 in the position for connecting the oscillator and the laser unit 1.
- the analog signal A corresponding to the code that has been read reaches the digitizer 23 and starting therefrom, in pulse form, reaches the decoder 24 together with the phase shift signal cos ⁇ arriving from the divider 22 and with the angular position signal arriving from the sensor 25.
- the signal cos ⁇ at the output of the demodulator 13 causes the processing of a signal that can switch the selector 17 and allow the modulation of the laser beam emitted by the unit 2, which is focused onto the field in which the code 26 is present. The steps then follow one another in the above described manner.
- the mixer 20 is constituted by a PMB2330 integrated circuit produced by the German company Siemens AG.
- FIG. 2 illustrates an embodiment of the phase demodulator 13, which consists of two mixers 27 and 28, the inputs of which receive the signal Acos( ⁇ o t+ ⁇ ) provided by the amplitude amplifier 12. While the mixer 27 receives the modulating signal with the rule cos( ⁇ o t), the mixer 28 receives the same signal advanced by ⁇ /2 by the circuit 29, i.e. sin ( ⁇ o t).
- the signal Acos ⁇ is present at the output of the mixer 27 and the signal Asin ⁇ is present at the output of the mixer 28.
- These signals are processed by the analog divider 22 into the output signal tan ⁇ , i.e. again a signal which is a function only of the phase shift angle matching the distance between the code 26 and the scanner.
- FIG. 3 illustrates a possible embodiment of the decision circuit 19 and of the switch 17.
- the inputs of the operational amplifier 30 are connected to a circuit 31 for providing a reference signal, and respectively to the phase shift signal cos ⁇ .
- the output of the operational amplifier 30 provides a direct signal at the output 32 and an inverted signal, produced by a NOT logic gate 34, at the output 33.
- the direct and inverted signals respectively switch on and off the two switching circuits 35 and 36 connecting the local oscillator 14 to the laser units 1, 2.
- the switching circuits can be provided, for example, with devices that are commercially known by the code PSW1211 and are manufactured by the US company MiniCircuits.
- FIG. 4 is the block diagram of a scanner having a single laser unit 37.
- the laser unit 37 is modulated directly and continuously by the signal cos( ⁇ o t) arriving from the local oscillator 14.
- the distance-indicating signal cos ⁇ is used only to provide information to the decoder as to the distance of the scanner from the code.
- a scanner according to this configuration can be used not only to read codes but also to measure the distance and position of objects and codes located in the space covered by the scan.
- FIG. 5 is a block diagram of a scanner with three laser, units 38, 39 and 40 for reading three fields: close, intermediate and distant.
- the selector 41 and the decision circuit 42 are accordingly designed for three outputs and two reference distance thresholds respectively.
- the associated decision circuit 42 and selection circuit 41 are illustrated in FIG. 6.
- the decision circuit 42 comprises two operational amplifiers 43 and 44 having a first input connected to a respective circuit 45, 46 that provides a positive or negative reference signal and a second input connected to the phase shift signal cos ⁇ .
- the outputs 47, 48 of the operational amplifiers 43, 44 are connected to the switching circuits 49, 50 which are related to the laser units 38, 40 for focusing onto the outermost reading fields.
- Said outputs 47, 48 are connected to the inputs of a NAND logic gate 51, at the output 52 of which there is a signal only in the presence of a signal on one of the outputs 47 and 48. Accordingly, the signal at the output 52 connected to the switch 53 related, to the laser unit 39 allows to focus the laser beam on the code which is located in an intermediate reading field.
- C.P.U. Central Processing Unit
- Said scanner will be able to read codes with the depth of field of a single laser, but will also be able to report, in addition to the code it has read, the distance of the code from the scanner.
Abstract
Description
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/004,920 USRE36251E (en) | 1993-11-04 | 1998-01-09 | Laser bar code reader measuring phase of the pulse laser to determine the distance |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITBO93A0440 | 1993-11-04 | ||
IT93BO000440A IT1264733B1 (en) | 1993-11-04 | 1993-11-04 | LASER READING DEVICE OR SCANNER FOR READING CHARACTERS HAVING A DIFFERENT DEGREE OF REFLECTENCE, IN PARTICULAR OF CODES A |
US08/327,749 US5483051A (en) | 1993-11-04 | 1994-10-24 | Laser bar code reader measuring phase of the pulse laser to determine the distance |
US09/004,920 USRE36251E (en) | 1993-11-04 | 1998-01-09 | Laser bar code reader measuring phase of the pulse laser to determine the distance |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/327,749 Reissue US5483051A (en) | 1993-11-04 | 1994-10-24 | Laser bar code reader measuring phase of the pulse laser to determine the distance |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE36251E true USRE36251E (en) | 1999-07-13 |
Family
ID=11339297
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/327,749 Ceased US5483051A (en) | 1993-11-04 | 1994-10-24 | Laser bar code reader measuring phase of the pulse laser to determine the distance |
US09/004,920 Expired - Lifetime USRE36251E (en) | 1993-11-04 | 1998-01-09 | Laser bar code reader measuring phase of the pulse laser to determine the distance |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US08/327,749 Ceased US5483051A (en) | 1993-11-04 | 1994-10-24 | Laser bar code reader measuring phase of the pulse laser to determine the distance |
Country Status (7)
Country | Link |
---|---|
US (2) | US5483051A (en) |
EP (2) | EP1607901B1 (en) |
JP (1) | JP3793585B2 (en) |
AT (2) | ATE304195T1 (en) |
DE (2) | DE69434481T2 (en) |
ES (1) | ES2248792T3 (en) |
IT (1) | IT1264733B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE37017E1 (en) * | 1990-10-09 | 2001-01-16 | Datalogic S.P.A. | Laser-beam bar code reader |
US9530037B1 (en) | 2015-07-20 | 2016-12-27 | Datalogic ADC, Inc. | Toggling activation of lasers in scanner systems |
Families Citing this family (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5576529A (en) * | 1986-08-08 | 1996-11-19 | Norand Technology Corporation | Hand-held optically readable information set reader focus with operation over a range of distances |
US5581067A (en) * | 1990-05-08 | 1996-12-03 | Symbol Technologies, Inc. | Compact bar code scanning module with shock protection |
US6631842B1 (en) * | 2000-06-07 | 2003-10-14 | Metrologic Instruments, Inc. | Method of and system for producing images of objects using planar laser illumination beams and image detection arrays |
US7387253B1 (en) * | 1996-09-03 | 2008-06-17 | Hand Held Products, Inc. | Optical reader system comprising local host processor and optical reader |
DE19520993A1 (en) * | 1995-06-08 | 1996-12-12 | Sick Optik Elektronik Erwin | Distance measuring method and device |
US5684289A (en) * | 1995-10-30 | 1997-11-04 | Ncr Corporation | Optical scanner having enhanced item side coverage |
US6330974B1 (en) * | 1996-03-29 | 2001-12-18 | Intermec Ip Corp. | High resolution laser imager for low contrast symbology |
WO1998020444A1 (en) * | 1996-11-04 | 1998-05-14 | Computer Identics Corporation | Barcode position detecting system |
GB2319103B (en) * | 1996-11-05 | 2000-05-03 | Psc Inc | Combination range laser scanner utilizing periodic range switching |
IT1289438B1 (en) * | 1996-12-11 | 1998-10-15 | Datalogic Spa | SCANNING READER OF AN OPTICAL CODE PLACED ON A MOVING ARTICLE AND METHOD OF SCANNING OF SAID OPTICAL CODE BY MEANS OF SAID |
ATE268464T1 (en) * | 1996-12-31 | 2004-06-15 | Datalogic Spa | METHOD AND APPARATUS FOR MEASURING THE VOLUME OF AN OBJECT |
US5900611A (en) * | 1997-06-30 | 1999-05-04 | Accu-Sort Systems, Inc. | Laser scanner with integral distance measurement system |
ATE202865T1 (en) * | 1997-09-17 | 2001-07-15 | Datalogic Spa | DEVICE AND METHOD FOR DETERMINING THE PRESENCE AND EXTENSION OF AN OBJECT |
EP0926582B1 (en) * | 1997-12-24 | 2000-09-27 | Datalogic S.P.A. | Apparatus and process for focusing a laser beam for optical codes |
US6712274B2 (en) * | 1998-03-26 | 2004-03-30 | Symbol Technologies, Inc. | Permanent visual shock indicator |
US6715681B2 (en) * | 1998-03-26 | 2004-04-06 | Symbol Technologies, Inc. | Scanning module for single line and raster scanning using dual lasers |
US6193157B1 (en) * | 1998-07-27 | 2001-02-27 | Cimatrix | Frequency division multiplexed bar code scanner |
DE10012715B4 (en) * | 1999-03-19 | 2014-05-28 | Cognex ,Ltd. | Method for positioning a scanner relative to a coded surface and scanner, in particular for reading bar codes, two-dimensional codes and color codes |
EP1067361A1 (en) * | 1999-07-06 | 2001-01-10 | Datalogic S.P.A. | Method and a device for measuring the distance of an object |
EP1074854A1 (en) | 1999-08-04 | 2001-02-07 | Datalogic S.P.A. | Method for measuring the distance of an object |
AU2001250914A1 (en) * | 2000-03-21 | 2001-10-03 | Accu-Sort Systems, Inc. | Large depth of field line scan camera |
US6603563B1 (en) | 2000-04-05 | 2003-08-05 | Accu-Sort Systems, Inc. | Apparatus for determining measurements of an object utilizing negative imaging |
US6637655B1 (en) | 2000-06-08 | 2003-10-28 | Metrologic Instruments, Inc. | Automatic range adjustment techniques for stand-mountable bar code scanners |
EP2093694B1 (en) | 2000-10-26 | 2011-06-22 | Datalogic S.p.A. | Receiving chamber for a laser reader |
US20020050519A1 (en) | 2000-10-26 | 2002-05-02 | Oliva Guido M. | Laser module for reading optical codes |
DE10126086A1 (en) | 2001-05-29 | 2002-12-05 | Sick Ag | Optoelectronic sensor |
US7195164B2 (en) * | 2003-01-03 | 2007-03-27 | Symbol Technologies, Inc. | Optical code reading device having more than one imaging engine |
US8316068B2 (en) | 2004-06-04 | 2012-11-20 | Telefonaktiebolaget Lm Ericsson (Publ) | Memory compression |
US7963448B2 (en) | 2004-12-22 | 2011-06-21 | Cognex Technology And Investment Corporation | Hand held machine vision method and apparatus |
US9552506B1 (en) | 2004-12-23 | 2017-01-24 | Cognex Technology And Investment Llc | Method and apparatus for industrial identification mark verification |
US8108176B2 (en) * | 2006-06-29 | 2012-01-31 | Cognex Corporation | Method and apparatus for verifying two dimensional mark quality |
US8413902B2 (en) | 2007-09-07 | 2013-04-09 | Datalogic Scanning Group S.R.L. | Image acquisition device and optical component thereof |
US9734376B2 (en) | 2007-11-13 | 2017-08-15 | Cognex Corporation | System and method for reading patterns using multiple image frames |
CN101470799B (en) * | 2007-12-28 | 2011-09-21 | 茂森科技股份有限公司 | Laser bar code scanner and its execution method |
KR101027808B1 (en) * | 2009-05-18 | 2011-04-07 | 광주과학기술원 | Apparatus and method for calculating phase of laser in laser scanner, and laser scanner with the said apparatus |
DE202010007088U1 (en) | 2010-05-21 | 2011-09-21 | Sick Ag | Security scanner to secure and support automatic navigation |
US9305231B2 (en) | 2013-08-01 | 2016-04-05 | Cognex Corporation | Associating a code with an object |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4877949A (en) * | 1986-08-08 | 1989-10-31 | Norand Corporation | Hand-held instant bar code reader system with automated focus based on distance measurements |
JPH027182A (en) * | 1988-06-27 | 1990-01-11 | Matsushita Electric Ind Co Ltd | Bar code detector |
US5256864A (en) * | 1991-09-24 | 1993-10-26 | Spectra-Physics | Scanning system for preferentially aligning a package in an optimal scanning plane for decoding a bar code label |
US5426288A (en) * | 1992-09-28 | 1995-06-20 | Nippondenso Co., Ltd. | Bar code reader and reading method using single laser light source for both reading information and measuring distance |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4569078A (en) * | 1982-09-17 | 1986-02-04 | Environmental Research Institute Of Michigan | Image sensor |
JPH01100492A (en) * | 1987-10-14 | 1989-04-18 | Matsushita Electric Ind Co Ltd | Laser vision sensor |
IT1242584B (en) * | 1990-10-09 | 1994-05-16 | Datalogic Spa | LASER BEAM BAR CODE READER. |
CA2056272C (en) * | 1991-06-14 | 2001-10-16 | Patrick Salatto, Jr. | Combined range laser scanner |
US5378883A (en) * | 1991-07-19 | 1995-01-03 | Omniplanar Inc. | Omnidirectional wide range hand held bar code reader |
-
1993
- 1993-11-04 IT IT93BO000440A patent/IT1264733B1/en active IP Right Grant
-
1994
- 1994-06-06 AT AT94108648T patent/ATE304195T1/en not_active IP Right Cessation
- 1994-06-06 DE DE69434481T patent/DE69434481T2/en not_active Expired - Lifetime
- 1994-06-06 DE DE69435229T patent/DE69435229D1/en not_active Expired - Lifetime
- 1994-06-06 EP EP05019382A patent/EP1607901B1/en not_active Expired - Lifetime
- 1994-06-06 AT AT05019382T patent/ATE439644T1/en not_active IP Right Cessation
- 1994-06-06 EP EP94108648A patent/EP0652530B1/en not_active Expired - Lifetime
- 1994-06-06 ES ES94108648T patent/ES2248792T3/en not_active Expired - Lifetime
- 1994-10-24 US US08/327,749 patent/US5483051A/en not_active Ceased
- 1994-11-01 JP JP26790494A patent/JP3793585B2/en not_active Expired - Lifetime
-
1998
- 1998-01-09 US US09/004,920 patent/USRE36251E/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4877949A (en) * | 1986-08-08 | 1989-10-31 | Norand Corporation | Hand-held instant bar code reader system with automated focus based on distance measurements |
JPH027182A (en) * | 1988-06-27 | 1990-01-11 | Matsushita Electric Ind Co Ltd | Bar code detector |
US5256864A (en) * | 1991-09-24 | 1993-10-26 | Spectra-Physics | Scanning system for preferentially aligning a package in an optimal scanning plane for decoding a bar code label |
US5426288A (en) * | 1992-09-28 | 1995-06-20 | Nippondenso Co., Ltd. | Bar code reader and reading method using single laser light source for both reading information and measuring distance |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE37017E1 (en) * | 1990-10-09 | 2001-01-16 | Datalogic S.P.A. | Laser-beam bar code reader |
US9530037B1 (en) | 2015-07-20 | 2016-12-27 | Datalogic ADC, Inc. | Toggling activation of lasers in scanner systems |
US10275623B2 (en) | 2015-07-20 | 2019-04-30 | Datalogic Usa, Inc. | Toggling activation of lasers in scanner systems |
Also Published As
Publication number | Publication date |
---|---|
IT1264733B1 (en) | 1996-10-04 |
ITBO930440A1 (en) | 1995-05-04 |
ATE304195T1 (en) | 2005-09-15 |
EP0652530A3 (en) | 1997-06-11 |
JP3793585B2 (en) | 2006-07-05 |
EP1607901A2 (en) | 2005-12-21 |
JPH07254040A (en) | 1995-10-03 |
US5483051A (en) | 1996-01-09 |
EP0652530A2 (en) | 1995-05-10 |
EP1607901B1 (en) | 2009-08-12 |
DE69434481D1 (en) | 2005-10-13 |
ES2248792T3 (en) | 2006-03-16 |
ITBO930440A0 (en) | 1993-11-04 |
DE69435229D1 (en) | 2009-09-24 |
EP0652530B1 (en) | 2005-09-07 |
EP1607901A3 (en) | 2006-06-14 |
ATE439644T1 (en) | 2009-08-15 |
DE69434481T2 (en) | 2006-06-22 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
USRE36251E (en) | Laser bar code reader measuring phase of the pulse laser to determine the distance | |
US4006343A (en) | Code read-out means | |
US5393967A (en) | Method and apparatus for non-contact reading of a relief pattern | |
US6552329B2 (en) | Method for a quantitative detection of a linear and rotary movement | |
US3995166A (en) | Optical scan pattern generator for code reading systems | |
US6512575B1 (en) | Method and a device for measuring the distance of an object | |
US3971917A (en) | Labels and label readers | |
EP0163347B1 (en) | Measuring system for contactless measuring the distance between a predetermined point of an object surface and a reference level | |
CN112368601A (en) | LIDAR system based on light modulator and coherent receiver for simultaneous range and velocity measurement | |
JPH02183386A (en) | Symbol reading device | |
CA1146670A (en) | Optical reader for bar coded labels | |
CN104156682A (en) | Apparatus for and method of electro-optically reading a target in the presence of ambient light by suppressing the ambient light | |
EP1118062B1 (en) | Frequency division multiplexed bar code scanner | |
US6293468B1 (en) | Pulsed barcode scanner | |
JPH03233692A (en) | Bar code reader | |
CA2219873C (en) | A bar code reader | |
CN1108416A (en) | Compatible optical read device | |
JPH02208788A (en) | Optical scanner | |
JPH06251184A (en) | Optical information reader | |
JP2001357346A (en) | Bar code reader | |
JPH0535904A (en) | Bar code reader | |
JPS6365585A (en) | Optical reader | |
JPH06259592A (en) | Bar code reader | |
JPH04232581A (en) | Bar code reader | |
JPH02205988A (en) | Reader |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
SULP | Surcharge for late payment | ||
FPAY | Fee payment |
Year of fee payment: 8 |
|
AS | Assignment |
Owner name: DATASENSOR S.P.A., ITALY Free format text: CHANGE OF NAME;ASSIGNOR:I.E.S. S.P.A.;REEL/FRAME:014675/0429 Effective date: 20001211 Owner name: I.E.S. S.P.A., ITALY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DATALOGIC S.P.A.;REEL/FRAME:014675/0367 Effective date: 20001211 |
|
FEPP | Fee payment procedure |
Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 12 |
|
AS | Assignment |
Owner name: DATALOGIC S.P.A., ITALY Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE CORRECT ASSIGNEE PREVIOUSLY RECORDED ON REEL 014675 FRAME 0429;ASSIGNOR:I.E.S. S.P.A.;REEL/FRAME:022634/0785 Effective date: 20001211 |