EP1073985A1 - Analyseur a systeme mobile laser, a detecteur et a deux elements flexibles - Google Patents

Analyseur a systeme mobile laser, a detecteur et a deux elements flexibles

Info

Publication number
EP1073985A1
EP1073985A1 EP99920113A EP99920113A EP1073985A1 EP 1073985 A1 EP1073985 A1 EP 1073985A1 EP 99920113 A EP99920113 A EP 99920113A EP 99920113 A EP99920113 A EP 99920113A EP 1073985 A1 EP1073985 A1 EP 1073985A1
Authority
EP
European Patent Office
Prior art keywords
scanning apparatus
base section
rotor
light
section
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.)
Withdrawn
Application number
EP99920113A
Other languages
German (de)
English (en)
Inventor
Randall K. Hems
Brian M. Mcmaster
Jay M. Eastman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSC Inc USA
Original Assignee
PSC Inc USA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PSC Inc USA filed Critical PSC Inc USA
Publication of EP1073985A1 publication Critical patent/EP1073985A1/fr
Withdrawn legal-status Critical Current

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
    • G06K7/10603—Basic scanning using moving elements
    • G06K7/10633—Basic scanning using moving elements by oscillation
    • G06K7/10643—Activating means
    • G06K7/10653—Activating means using flexible or piezoelectric means

Definitions

  • the present invention relates to a novel optical scanning and bar code reading apparatus . More specifically, the present invention relates to an improved optical scanning and bar code reading apparatus including an improved conductive flexure arrangement, a simplified layout of optical elements, and an improved arrangement of electrical pathways between the rotor and stationary base assemblies of the scanning and bar code reading apparatus .
  • Flexure based scanners appearing in the past such as those disclosed in commonly owned U.S. Patent No. 5,015,831 issued on May 14, 1991, and U.S. Patent No. 5,115,120 issued on May 19, 1992, both incorporated herein by reference, illustrate scan engines using flexural mounts for an oscillating rotor.
  • Such mounts have facilitated miniaturization of scan engines by enabling a laser diode and associated photodetector to be mounted on a rotor, which can be reciprocally - 2 - oscillated relative to a stator to scan a light beam across a bar code.
  • Other scanning assemblies include a rotor, a stationary base, and four flexures between the rotor and the base.
  • the flexures permit oscillation of, and provide support to, the rotor with respect to the base.
  • the rotor carries a light source, such as a laser diode, and a coil.
  • the stationary base in turn carries a magnetic source and a light detector.
  • a preferred embodiment of the invention which is intended to accomplish at least some of the foregoing objects includes a light source and light detector assembly mounted to a rotor, a sense circuit and a signal processing unit and a control unit mounted to a stationary base, and a pair of conductive flexures between the rotor and stationary base that support and suspend the rotor for movement relative to the stationary base.
  • the pair of conductive flexures each provide a single conductive pathway for operation of the light source and the light detector assembly.
  • the flexures supply power to the light source and provide a pathway for transmission of signals that are representative of the output of the light detector assembly and, hence, contain information about the scanned data.
  • the rotor also includes a magnet source
  • the stationary base includes an electro-magnetic coil, which is responsive to the magnet source to _ 4 _ oscillate the rotor relative to the stationary base. Oscillation of the rotor scans a laser beam across " scannable data, including object or symbol data to be scanned, for example a bar code. Based on information transmitted from circuitry on the rotor through the conductive flexures, the sense circuit and demodulator generate information representative of the scanned bar code .
  • Figure 1 is a system block diagram of the flexure based scanner in accordance with the invention.
  • Figure 2 is a graph of time versus the output of a light-to- frequency converter and shows the correlation of the output frequency of the light-to- frequency converter relative to a bar code being scanned;
  • Figure 3 is a graph of time versus current through a first flexure of the flexure based scanner and shows the correlation of current through the first flexure relative to the bar code depicted in Figure 2 ;
  • Figure 4 is a front perspective view of an embodiment of a scanning apparatus in accordance with the invention.
  • FIG. 5 is a side view of another embodiment of the scanning apparatus in accordance with the invention. - 5 -
  • Figure 6A is a top view of the embodiment shown in Figure 5 ;
  • Figure 6B is a top view of the embodiment shown in Figure 5, illustrating scanning motion of the rotor section in accordance with the invention
  • FIG. 7 is a top view of yet another embodiment of the scanning apparatus in accordance with the invention.
  • Figure 8 is a top perspective view of the embodiment of Figure 7;
  • Figure 9 is a front view of the embodiment of Figure 7 ;
  • Figure 10 is a side view in cross section of the embodiment of Figure 9 as taken along section line A-A;
  • Figure 11 is a rear view of the embodiment of Figure 7 as taken along section line B-B.
  • the flexure based scanning apparatus includes a rotor, represented by box 10, and a stationary base, represented by box 12.
  • the rotor 10 moves in a scanning direction to scan the light source and the light detector assembly across scannable material, such as a bar code, as will be described in more detail below.
  • the rotor 10 preferably includes a light source 14, a light detector assembly 16, and a magnet source 18.
  • the rotor also preferably includes a switching transistor 36 and a resistor 38, which is electrically connected to a first terminal (here, a collector) of the transistor 36.
  • a first terminal here, a collector
  • the transistor 36 is disclosed in Figure 1 as a bipolar transistor, it is not limited thereto.
  • the transistor 36 may be implemented by other transistor types, such as FETs and light transistors.
  • electrical component 36 need not be a transistor at all, but rather can be a magnetic switch, a light switch, or other suitable switch.
  • the light source 14 preferably comprises a laser assembly with integrated electronics.
  • the laser assembly 14 provides a continuous wave output.
  • Drive electronics (not shown) preferably are integrated into the laser assembly via a relatively small, application- specific, integrated circuit. Power adjustment could be done by laser trimming of a resistive element during manufacture of the laser assembly. Alternatively, the drive electronics could be incorporated on the rotor, but not as part of the laser assembly itself.
  • the light detector assembly 16 includes a light- to-frequency converter (also denoted 16 in some subsequent description) and a photodetector which can detect light reflected from a bar code.
  • Light-to- frequency converters suitable for use in the present invention are commercially available and typically have a wide dynamic range, accommodating a large range of collected light levels. Suitable light-to-frequency converters include those sold and marketed by Texas Instruments, such as part number TSL235.
  • the stationary base 12 includes a main printed circuit board 20 and an electromagnetic element or coil 22.
  • the coil 22 may be mounted directly to the printed circuit board 20, or it may be connected to the - 7 - stationary base by two wires or leads.
  • An input/output element 24 leads to a terminal so that the scanning assembly can be used with, or separately from, a remote unit to provide, as one example, a portable data collection and transaction terminal system for collecting and entering optical data.
  • the output from the printed circuit board may be non-decoded bar code data or ASCII (decoded) data.
  • the main printed circuit board 20 includes an input voltage 26 (+V IN ) and a sense resistor 28 in parallel with a sense circuit 29 and demodulator 30.
  • Input voltage 26 preferably comprises a connection to an external voltage source.
  • the main printed circuit board 20 also includes a drive circuit 31 for the coil 22. That drive circuit is controlled by control unit 33.
  • the main printed circuit board 20 further includes a signal processing unit 33 to decode bar code information for output to the terminal via interface circuits 35.
  • the demodulator 30 may electrically communicate directly with the input/output element 24 and may provide output in the form of undecoded bar code information via the input/output element 24 to the terminal.
  • the signal processing unit, and any control units, may be simple analog components, or they may be incorporated into a microcontroller capable of digital control and processing.
  • the flexure based scanning apparatus includes a pair of flexures 32 and 34 which electrically connect the rotor 10 and the stationary base 12 and which support and suspend the rotor 10 and its components for movement relative to the stationary base 12.
  • the rotor 10 generally translates side-to-side in a scanning direction relative to the stationary base 12 during scanning . - 8 -
  • Movement of the rotor occurs due to the interplay between the magnet source 18 and the coil 22.
  • the magnet source 18 and coil 22 electro-mechanically oscillate the rotor side-to-side relative to the stationary base to scan a laser beam across an object or symbol to be scanned, such as a bar code.
  • each flexure 32 and 34 preferably comprises a single conductor between the rotor 10 and the base 12.
  • the first flexure 32 is electrically connected to the sense resistor 28 and the sense circuit 29.
  • the first flexure 32 is connected to the switching transistor 36, one terminal of the laser assembly 14, and one terminal of the light-to-frequency converter 16.
  • the second flexure 34 is connected to the load resistor 38, another terminal of the laser assembly 14, and another terminal of the light-to- frequency converter 16.
  • the second flexure 34 is connected to a common return.
  • the electrical pathways in the rotor and stationary base can be formed on platable, molded plastic parts which become structural elements of the rotor and stationary base bodies, or pathways could be formed using conventional printed circuit board materials and fabrication methods, or extensions of the flexure itself could be attached directly to the printed circuit boards.
  • the first flexure 32 maintains a voltage +V CC (substantially equal to +V IN minus the voltage drop across the sense resistor 28) .
  • the second flexure 34 - 9 - is connected as a common return. Current leaving the stationary base 12 through the first flexure (I P1 in Figure 1) substantially equals the current leaving the rotor through the second flexure 34 (I F2 ) .
  • the electrical system of the subject flexure based scanner using transistor 36, switches current through a load resistor 38 ON and OFF in response to the output of the light-to-frequency converter 16, as will be described below. Switching the current through the resistive load ON and OFF, based on the output of the light-to-frequency converter 16, modulates the current through the first flexure 32.
  • current I F1 from the first flexure 32 branches to a second terminal (here, an emitter) of the transistor 36 ( I h0AD ) and to both the light source 14 and the light-to-frequency converter 16
  • Figure 2 is a graph of time (x-axis) versus the output (V ou ⁇ ) of a light-to-frequency converter (y- axis) .
  • a bar code being scanned is positioned above the graph to show the correlation of the output frequency (V ou ⁇ ) relative to the bar code being scanned.
  • the output frequency (V ou ⁇ ) which is fed into the base of the switching transistor 36, switches the transistor ON and OFF.
  • the switching transistor turns OFF when V o ⁇ is HIGH and turns ON when V ou ⁇ is LOW.
  • the switching transistor rapidly turns ON and OFF when V ou ⁇ has a high frequency (i.e., during scanning of white space of a bar code) and turns ON and OFF more slowly when V ou ⁇ has a low frequency (i.e., during scanning of a dark bar of a bar code) .
  • the transistor turns ON and OFF at a rate based on the amplitude of the output signal from the photodetector (which is converted to a frequency by the light-to- frequency detector) .
  • I L0AD the current through resistor 38
  • I F1 the current through resistor 38
  • Figure 3 is a graph of time (x-axis) versus I F1 (y- axis) .
  • the frequency of I F1 follows the frequency of V ou ⁇ and varies between I ⁇ ER + I CONVERTER an d ⁇ OAD + ⁇ LASER + C ON ERTER depending on V ou ⁇ (i.e., depending on whether the switching transistor is ON or OFF) .
  • I F1 the current through the first flexure 32, approximately equals the current through the sense resistor 28 of the stationary base 12; the sense circuit 29 and demodulator 30 draw a relatively small amount of current.
  • I F1 indicates the value and frequency of the output voltage (V ou ⁇ ) of the light-to-frequency converter 16.
  • the voltage across the sense resistor 28 (and the sense circuit 29) directly relates to the output voltage (V ou ⁇ ) of the light-to-frequency converter 16. That voltage may be - 11 - demodulated by the demodulator 30 using analog circuits or using microcode in a micro-controller. In this manner, the sense circuit 29 and demodulator 30 can recreate the detected bar code information.
  • an additional signal -- the output signal of the light detector -- is transmitted from the rotor to the stationary base.
  • the laser assembly is carried by the rotor and the light detector is mounted to the stationary base
  • proper alignment of the laser assembly and the light detector over the entire range of motion has proved difficult, especially when the rotor translates side-to-side relative to the stationary base.
  • the present invention improves alignment of the laser assembly and the light detector. The laser assembly and the light detector remain in the same relative position throughout the scanning motion, resulting in more uniform light collection.
  • FIG. 4 shows an embodiment of the scanning apparatus for scanning an optical beam over scannable data in accordance with the invention.
  • a rotor 10a has a light source 14a and a light detector assembly 16a mounted thereto.
  • the light source 14a preferably comprises a laser diode assembly
  • the light detector assembly 16a preferably comprises a photodetector and a light-to-frequency converter.
  • the rotor 10a itself may be formed as a printed circuit board that contains an electrical circuit for transmission of power signals to the light source 14a and for transmission of electrical signals representative of scanned data from the light detector assembly 16a.
  • the base 12a may also be comprised of a printed circuit board.
  • An electromagnetic assembly is mounted to the base and is responsive to a magnet source mounted to the rotor 10a to move the rotor 10a relative to the base 12a.
  • the electromagnetic assembly and the magnet source are not shown in Figure 4 for convenience of illustration. Examples of these elements may be found in Figures 5, 6, 10, and 11.
  • a first flexure element 32a and a separate, second flexure element 34a support the rotor 10a relative to the base 12a.
  • the flexures 32a and 34a are mounted between the front surface 40 of the base 12a and the rear surface 42 of the rotor 10a, one above the other, by brackets 44.
  • the flexures 32a and 34a can be glued, soldered, or otherwise attached to the brackets 44.
  • the brackets 44 are preferably plastic.
  • the two flexures 32a and 34a may be mounted at different locations on the front surface 40 of the base 12a and the rear surface 42 of the rotor 10a, as long as the flexures support the rotor for movement in a scanning direction.
  • the base 12a may be rotated 90 degrees about its vertical axis V-V or horizontal axis H-H, and the flexures 32a and 34a may be attached to a side edge 46 or top (bottom) edge 48, respectively, of the base 12a.
  • the first and second flexures 32a and 34a are conductive and, in the preferred embodiment, each provides a single electrical conductor between the rotor 10a and the base 12a such that only two conductors (or conductive pathways) exist between the rotor 10a and the base 12a for operation of the light source 14a and the light detector assembly 16a.
  • the printed circuit boards that comprise the rotor 10a and the base 12a preferably are configured in the manner described in Figure 1.
  • FIG. 4 shows another embodiment with a different light detector assembly 16b.
  • the light detector assembly 16b includes a collection mirror 50 in addition to a light detector assembly 54, which includes a photodetector and a light-to-frequency converter.
  • the collection mirror 50 is curved or shaped to capture light reflected from the scanned bar code.
  • the light source 14b transmits light L to a scannable bar code, and light reflected by the bar code RF is collected by the collection mirror 50 and focused by the collection mirror 50 onto the photodetector of the light detection assembly 54.
  • rotor 10b and base 12b may comprise printed circuit boards, and these printed circuit boards are configured in the manner described in Figure 1.
  • Figure 5 also shows an electromagnetic assembly in the form of coil 22b mounted to the base 12b and a magnet source 18b mounted to the rotor 10b.
  • the interaction of the electromagnetic coil 22b and the magnet source 18b operates to oscillate the rotor relative to the stationary base.
  • the rotor 10b moves relative to the base 12b in a scanning direction (shown in at one extreme of a - 14 - scanning arc) to sweep the light source over scannable material .
  • FIGS 5, 6A, and 6B show one possible configuration for mounting the electromagnetic coil 22b and the magnet source 18b on the scanning assembly; the electromagnetic coil 22b and the magnet source 18b may be positioned elsewhere on the base 12b and rotor 10b, respectively, provided that they interact to enact rotor movement .
  • Figures 7-11 show yet another embodiment of a scanning apparatus in accordance with the present invention.
  • first flexure 32c and second flexure 34c support rotor 10c on stationary base 12c.
  • the flexures extend from either side of a front surface 60 of the base 12c and angle inward to a rear surface 62 of a first curved portion 64 of a light collector.
  • the light collector includes the first curved portion 64 and a second portion 66.
  • the second portion 66 in turn generally comprises a top extension 72, a bottom extension 74, and a front extension 76 extending therebetween.
  • the first curved portion 64 and the second portion 66 preferably comprises mirrors with reflective surfaces.
  • the base 12c comprises a printed circuit board and includes, on a rear surface 68, an input/output connector 24c for connection to a remote terminal.
  • the printed circuit board of the base 12c preferably is configured in the manner described in connection with Figure 1.
  • the rotor 10c also includes an electric circuit on a printed circuit board 70; the preferred configuration of the electric circuit of the rotor 10c is described in Figure 1.
  • an electromagnetic assembly in the form of an electromagnetic coil 22c may be mounted to the base 12c, and a magnet source 18c may be mounted to the - 15 - rotor 10c.
  • the interaction of the electromagnetic coil 22c and the magnet source 18c operates to oscillate the rotor relative to the stationary base in a scanning direction.
  • the magnet source 18c slides over the coil in one or another direction (into and out of the paper in Figure 10) to move the rotor 10c relative to the base 12c.
  • a light source 14c shown as a laser diode, is also mounted to the rotor 10c.
  • the laser diode 14c transmits light L to a scannable bar code.
  • Light RL reflected from the scanned bar code is transmitted to a light collecting surface 63 of the first curved portion 64 of the light collector and then reflected to a light collecting, convex rear face 78 of the front extension 76 of the second portion 66, as shown in Figure 10.
  • the light RL then passes to a photodetector of the light detector assembly 16c.
  • the light detector assembly 16c comprises a photodetector and light-to-frequency converter.
  • the light-to-frequency converter is electrically connected to the electronic circuit on the rotor's printed circuit board 70.
  • the printed circuit board 70 communicates with the flexures 32c and 34c, for example, via extensions 67 of the flexure itself that attach directly to the printed circuit board 70, as shown in Figure 7. These extensions 67 may extend through brackets 88 and 90.
  • the output of the light- to-frequency converter is electrically communicated through flexures 32c and 34c to the printed circuit board of the base 12c in the same manner described in connection with Figures 1-3.
  • Figures 10 and 11 also show an optional filter element 80 through which the reflected light passes before reaching the light detector assembly 16c.
  • the second portion 66 of the light collector of this embodiment preferably is mounted to the printed circuit board 70 via elements 84, as shown in Figure - 16 -
  • the first curved portion 64 of the light collector has an opening 86, shown in Figure 8, through which the light source 14c may electrically communicate with the printed circuit board 70.
  • the flexures 32c and 34c are mounted to brackets 88 and 90, respectively, that in turn are mounted to the rear face 62 of the first curved portion 64 of the light collector.
  • the flexures 32c and 34c mechanically support the rotor 10c relative to the base 12c and allow the rotor 10c to move in a scanning direction.
  • the flexures 32c and 34c each provide a single conductor between the rotor 10c and the base 12c to effect operation of the light source 14c and transmission of electrical signals from the light-to- frequency converter to the base circuitry.
  • the embodiment of Figures 7-11 provides a high performance scanner in a small volume.
  • the use of the light detection assembly 16c allows for a large light collection aperture combined with excellent optical noise rejection.
  • the embodiment of Figures 7-11 also integrates the light source 14c and the light detector assembly 16c in one structure, i.e., the rotor 10c, thus eliminating optical alignment problems that are inherent in combined dynamic/static optical systems.
  • the location and shape of the first curved portion 64 of the light collector allows a larger portion of the light detector assembly 16c to actively collect light reflected from a scanned bar code, thus increasing available bar code read ranges .
  • the two flexures are preferably formed of the same material and dimensioned to have the same thickness. The flexures, however, may differ in cross-sectional geometry from each other in some circumstances . These two independent flexures provide all of the mechanical support for the rotor in the present scanning apparatus . - 17 -
  • the scanning apparatus includes two separate flexure elements that operate to support the rotor relative to the stationary base and that serve as conductors (one conductor per flexure element) for transfer of information between the rotor and the base. It may also be possible to have a two-flexure apparatus where one flexure provides both conductors and the other flexure does not transmit information between the rotor and the base. In such an embodiment, the two separate flexures operate to support the rotor relative to the base and therefore are structurally configured to provide any necessary mechanical balance to the scanning apparatus. In this embodiment, as in the previously described embodiments, the scanning apparatus requires only two conductors (or conductive pathways) for its operation.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

L'invention concerne un analyseur comprenant une base (12) sur laquelle repose une unité de traitement des signaux, ainsi qu'un rotor (10) fixé à la base et mobile vis-à-vis d'elle. Un détecteur (16) est couplé au rotor. Une paire d'éléments flexibles (32, 34) rattachent le rotor à la base, en soutenant ce rotor dans son mouvement par rapport à ladite base. Les éléments en question constituent chacun un conducteur unique pour les signaux représentatifs de l'information analysée, destinés à être acheminée du détecteur à l'unité de traitement des signaux (33) qui équipe la base.
EP99920113A 1998-04-29 1999-04-29 Analyseur a systeme mobile laser, a detecteur et a deux elements flexibles Withdrawn EP1073985A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US8342598P 1998-04-29 1998-04-29
US83425P 1998-04-29
PCT/US1999/009219 WO1999056234A1 (fr) 1998-04-29 1999-04-29 Analyseur a systeme mobile laser, a detecteur et a deux elements flexibles

Publications (1)

Publication Number Publication Date
EP1073985A1 true EP1073985A1 (fr) 2001-02-07

Family

ID=22178238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99920113A Withdrawn EP1073985A1 (fr) 1998-04-29 1999-04-29 Analyseur a systeme mobile laser, a detecteur et a deux elements flexibles

Country Status (2)

Country Link
EP (1) EP1073985A1 (fr)
WO (1) WO1999056234A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6169614B1 (en) 1999-05-21 2001-01-02 Psc Scanning, Inc. Wedged-shape holographic collector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58105213A (ja) * 1981-12-18 1983-06-23 Matsushima Kogyo Co Ltd 光スキヤナ−
US5015831A (en) * 1988-11-07 1991-05-14 Photographic Sciences Corporation Scan modules for bar code readers and the like in which scan elements are flexurally supported
US5115120A (en) * 1990-06-26 1992-05-19 Photographic Sciences Corporation Scan modules for bar code readers and in which scan elements are flexurally supported

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9956234A1 *

Also Published As

Publication number Publication date
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