CN1037379C - Combined two distance laser scanner - Google Patents
Combined two distance laser scanner Download PDFInfo
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- CN1037379C CN1037379C CN92111185A CN92111185A CN1037379C CN 1037379 C CN1037379 C CN 1037379C CN 92111185 A CN92111185 A CN 92111185A CN 92111185 A CN92111185 A CN 92111185A CN 1037379 C CN1037379 C CN 1037379C
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Abstract
The present invention provides a device which uses two lasers with different focuses to illuminate. The present invention is composed of a first laser illuminating device and s second laser illuminating device, wherein the first laser illuminating device is suitable for scanning in a short distance which is shorter than about 2 feet; the second laser illuminating device is suitable for scanning in a long distance which is longer than about 2 feet and shorted than 17 feet. A scanner is provided with a logical return circuit network which can select an illuminating device for operation corresponding to various scanning application conditions. In order that the frequency of light signals which are received can be limited in the frequency of a standard signal processing return circuit and a decoding return circuit under the condition that any illuminating device is selected, the speed of laser spots is controlled.
Description
In general, the present invention relates to read the combined distance laser scanner and the method for the figure (for example bar code) that contains the different reflectivity zone with photoelectric method; Say in more detail, the present invention relates to use plural laser diode illumination optics device in case the combinations thereof that under different operating distances, can both focus apart from laser scanner and method.Preferred first embodiment of the present invention has and is best suited for first device of being close to scanning usefulness and is best suited for such two the laser lighting optical devices of second device that long range sweep uses.Two laser lighting optical devices are assembled among the combined distance laser scanner.
For recognition value, in petty dealer's industry, gradually adopted bar code especially, thereby also just developed various apparatus for reading of bar code.Most customer requirements of apparatus for reading of bar code are small-sized, in light weight, take few etc. the portable hand-held scanner of electricity.
The laser scan type apparatus for reading of bar code can have various concrete profiles, and the gun-type shell of both useful light weight plastic production also has the portable hand-held scanner head.The various positions of reading device are placed on the body of a gun part and the small of the stock part of gun-shaped shell.Also be, in body of a gun part, dispose miniature light sources, condenser lens, contained the compact optical device of the scanning mechanism that can make the light transversal scanning cutting rod font code that sends from light source, and the small light detecting device that can detect the light that is reflected by bar-code marks when scanning.
Miniature light sources can be by laser tube (for example coaxial as the helium-neon laser pipe) or luminous diode, and perhaps the semiconductor laser diode utmost point becomes.Because semiconductor laser diode is littler, in light weight than laser tube volume, so required size and the weight of scanner head can be little, and, to the processing of scanner head and operation also than being easier to, so semiconductor laser diode is more satisfactory.The light that is sent by light source is through behind the optical devices, and laser beam is directed to the scanning mechanism that is arranged on scanner head body of a gun part, and then bar-code marks is carried out transverse cuts scanning.Scanning mechanism has a scanning step motor at least, perhaps resonant rods, perhaps make the scanner of laser beam along long direction transverse cuts scanning bar code, if append second motor that can make laser beam broad ways transverse cuts scanning bar code, then scanning mechanism also can be made of two motors.The axle of scanning motor is equipped with the scanning mirror of the laser beam direction bar-code marks that passes through window.
Light by the bar-code marks reflection detects and handles with the detection loop.Detecting the loop generally is made of the photodetector of semiconductor photo diode tubing.The user has just determined the position of hand-held reading device in order to read figure by transverse cuts scanning bar code mark.In order to discern bar-code marks, the series of electrical signals that is produced by photodetector is sent to signal conditioning circuit.The output signal of signal conditioning circuit is sent to bar code figure demoder loop, and bar-code marks is decoded there.
When the user aims at bar-code marks to reading device, and when pulling the plate machine, light beam and detect the loop net and just be activated, and begin to scan.Because reading device is worked by this way, so when reading device adopts the built-in battery, the useful life that can prolong battery.In the plastic casing of light weight, the LASER Light Source of having packed into, detecting device, optical devices, signal conditioning circuit, central processing unit CPU and battery.Reading device is to design according to the principle that aims at bar-code marks from the position of leaving bar-code marks.Promptly, reading device both was not close to mark yet, also not along the mark transverse cuts move.In general, such hand-held apparatus for reading of bar code is specified in several inches interior use of scope.Replace above-mentioned scan mode, also might under artificial reference, automatically scan.
The working range that the photoelectricity bar-code marks in past reads laser scanning device has following restriction: (a) for the bar-code marks of the most general density, approximately from clinging to 2 feet, (b) for more low-density bar-code marks, approximately from 30 inches to 18 feet.Like this, because laser scanning device in the past only uses the laser lighting optical devices with single fixed focal length, so depth of focus is less, working range is narrow.
According to the above, first purpose of the present invention is to provide a kind of and read combined distance laser scanner and the method that bar code and so on has the figure in different reflectivity zone with photoelectric method.In order to be applicable to different operating distances, the combined distance laser scanner has used the two or more laser diode illumination optics devices that can do best focusing to different distance.Two laser optics lighting devices have been equipped with in the preferred embodiment of invention, promptly be best suited for from be close to up to 2 feet range sweeps the first laser lighting optical devices and be best suited for the second laser optics lighting device of about 2 to 17 feet scannings, two laser scanning devices are combined among the combined distance laser scanner.
Second purpose of the present invention is that a kind of described combined distance laser scanner that can select the logical circuit net of some laser lighting optical devices actions according to specific scanning application requirements that is equipped with is provided.The optical signal frequency that receives in order to make is limited on the frequency of signal Processing decoding loop of standard, according to selecteed be which laser lighting optical devices, the translational speed of the laser facula drive signal amplitude of gated sweep motor (for example by) is controlled.Scanning is to realize by the public oscillatory type scanning mirror that is driven by scanning motor, is close to or the situation of the first laser lighting optical devices of short distance work for being best suited for, and the amplitude ratio that is added in the drive signal on the scanning motor is bigger; For the situation of the second laser lighting optical devices that are best suited for long range sweep work, the amplitude ratio of drive signal is less.
In order to solve above-mentioned problem, when photoelectricity reads bar-code marks and so on and has the figure in different reflectivity zone, the invention provides combined distance laser scanner and method with following characteristics.Laser scanner contains: one is used to make laser beam to scan the public scanning mirror of the other end from an end of visual field, short distance laser lighting optical devices that are used for the short distance scanning work, a length that is used for long range sweep work is apart from the laser lighting optical devices.In order to collect, and, be provided with condenser optics its guiding detecting device by the light that is scanned visual field reflection.Detecting device detects the laser emission that is reflected, and generation and the corresponding electric signal of reflected light.
In more detail, in scanner, also be equipped with in order to make scanner can in the visual field, do short distance work or long apart from work and selection short distance laser illuminator system action or the long selecting arrangement that moves apart from laser illuminator system.In the first embodiment situation, also have signal conditioning circuit in the selecting arrangement, it can use long amplitude and the frequency of analyzing the light signal that is reflected apart from laser illuminator system and when starting the range determination action temporary transient.If the distance of bar code is far away during scanning, then the output signal frequency of detecting device is higher, and amplitude is littler, otherwise distance is shorter during scanning, and then the output signal frequency of detecting device is lower, and amplitude is bigger.Therefore, according to the amplitude and the frequency of the signal that is gone out by the range determination motion detection, can determine to select the short distance illumination optics device still is the long-distance illumination optical devices.In the second embodiment situation, used the sonar ranging device, to detect the distance of visual field internal object.In the 3rd embodiment situation, above-mentioned selecting arrangement is a kind of manual selecting arrangement by operator's operation, and for example the operator elects by operating a trigger with first gear and two gears of second gear.
In the first preferred embodiment situation, scanning mirror is a flat scanning mirror that is driven by scanning motor.Short distance laser lighting optical devices are to be configured in the scanning mirror short distance visible laser diode assembly of side nearby.Long apart from the laser lighting optical devices be a kind of length apart from the visible laser diode assembly, its configuration is, a mirror of turning back that is placed on the horizontal side of short distance visible laser diode assembly is arranged, and laser emission penetrates earlier from turning back mirror, reflected by scanning mirror again.
In addition, in a preferred embodiment, short distance laser lighting optical devices and length are a kind of laser diode combinations that are combined into one apart from the laser lighting optical devices, they all are placed on the side nearby of scanning mirror, and short distance work motor wherein all designs to such an extent that any one can move with long distance work motor.
The ideal operation distance of short distance laser lighting optical devices is from clinging to about 2 feet.With with relative, long ideal operation distance apart from the laser lighting optical devices is apart from reading device about 2 to 17 feet.Condenser optics respectively has a public condenser, and it is used for the whole laser emissions by the visual field reflection are gathered photodetectors such as photodiode.
By reading, will readily appreciate that the above-mentioned purpose and the advantage of combined distance photometry scanister of the present invention below with reference to the detailed description of accompanying drawing to several preferred embodiments.In institute's drawings attached, same parts are represented with same code name.
The simple declaration of accompanying drawing:
Fig. 1 is the presentation graphs of combined two distance laser scanner of the present invention to the scan decoder regional extent of various bar code resolution 4.
Fig. 2 is the major function of first embodiment of combined two distance laser scanner of the present invention and the block diagram of parts.
Fig. 3 is the major function of second embodiment of combined two distance laser scanner of the present invention and the block diagram of parts.
Fig. 4 is the Typical Disposition sketch map of the optical devices of combined two distance laser scanner of the present invention.
Fig. 5 is the side view of the exemplary optical of combined two distance laser scanner of the present invention.
Fig. 6 is the front elevation of the exemplary optical of Fig. 5.
Fig. 7 is the structure of laser diode module of the present invention and the sectional view of critical piece.
Fig. 8 is the sketch map that can correlate the rifle type apparatus for reading of bar code that uses with combined two distance laser scanner of the present invention.
Fig. 1 is illustrated under the situation of high-quality bar-code marks, and two (long and short) range sweep devices of combined type of the present invention are for the scan decoder regional extent of various bar code resolution.Can think that short distance can the sign indicating number zone be to read from clinging to about 2 feet bar code figure, and long distance decoding zone is that about 2 feet to 17 feet bar code figure reads.As shown in Figure 1, the resolution that may reach at the bar code figure place is wide wide to 0.05 inch bar for remote bar code figure from 0.005 inch bar for bar code figure very closely.Have the scope that repeats between short distance decoding zone and long distance decoding zone, in fact, the short distance area decoder has 4 * 1/2 feet wide approximately, and long distance decoding zone is approximately from 10 inches to about 12 feet wide.But, it is not optimum carrying out decoding work outside the scope narrower than above-mentioned zone.
Fig. 2 is the major function of first embodiment of two (long and short) range sweep devices of combined type of the present invention and the block diagram of parts.The combined two distance scanner counting/and in one second time bar code data is scanned, analyzes and transmits.Combined two distance scanner aiming bar-code marks, and cocking 12, following action sequence just started.
Map ranging device 14 in the scan module detects the distance of bar-code marks.In the first preferred embodiment situation, the structure of map ranging device 14 can be to start length range sweep mechanism temporarily to realize the range finding action, analyzes the amplitude and the frequency of reflected light signal with signal conditioning circuit.If when scanning, the bar code distance of placing was far away, then the frequency content of the detector output signal of Chan Shenging is higher, amplitude more on, otherwise if the distance during scanning is nearer, then the frequency content of the detector output signal of Chan Shenging is lower, amplitude is healed greatly.Therefore, according to signal amplitude that goes out from the range determination motion detection and frequency, can determine to select the short distance lighting device still to select the long-distance illumination device.Implement situation second, map ranging device 14 can be made of the viameter of commercially available camera with Polaroid sonar form.According to the output of map ranging device, it is long apart from visible laser diode 20 that net 16 decisions in switch loop select for use short distance visible laser diode 18 still to select for use.
In the first preferred embodiment situation, short distance laser lighting optical devices and the long side nearby that is placed in scanning mirror apart from laser lighting optical devices portion, and design both may also may be with long apart from mode of operation work with the work of short distance mode of operation, they form the laser diode module of a single integral body.In addition, in other preferred embodiment situation, as Fig. 4, Fig. 5 and shown in Figure 6, short distance laser lighting optical devices and length are separated apart from the laser lighting optical devices.
The laser beam that is produced by selected Solid State Laser diode by means of in the laser diode module focus optical devices being sent to the flat scanning mirror, and is carried out transverse cuts scanning by means of the oscillatory type scanning mirror to bar-code marks.Scanning realizes by means of the public oscillatory type flat scanning mirror that is driven by scanning motor.For the most suitable situation of being close to first laser illuminator system of work or short distance work, because the distance to short distance bar code target is short, the amplitude ratio that scanning motor drives is bigger, otherwise, for the second laser illuminator system situation that is best suited for long range sweep work, because to long distance, so the amplitude ratio of scanning motor drive signal is less apart from the bar code target.Various sweep velocitys make received optical signal frequency be limited on the frequency of standard signal treatment loop and decoding loop.The oscillatory type scanning mirror makes the laser beam reflection, and by outgoing window directive bar-code marks.Usually, laser beam is with the speed of about per second 36 times transverse cuts scanning bar code mark to and fro.Photodetector is surveyed the laser that reflects from bar-code marks, and this converting optical signals is become analog electrical signal.This simulating signal is handled by the analog loopback net 22 that adopts known technology.The formal representation of this simulating signal be contained in information in the bar-code marks.
Signal in the digitizing loop 24 is adjusted the loop and is adopted known technology that simulating signal is transformed into digitized bar pattern signal.This figure signal is sent to the interface control module in the controller chassis 26, and decoded.
Fig. 3 is the major function of second embodiment of combined two distance laser scanner of the present invention and the block diagram of parts.In this embodiment situation, operate trigger 12 by the operator with first gear and second gear, select short distance or length to come work apart from one in the laser diode.The following describes the course of work.With the situation of distance work under, at first trigger plates is placed on the first gear place, logical transition Tian Guan loop net 32 in the combination dual range scanner will be selected long apart from laser diode work, and be chosen in the suitable aiming scan amplitude of the scanning motor under the work of aiming pattern.As everyone knows, under the aiming pattern, be the work of flat scanning mirror at first, make low speed vibration, form the horizontal scanning line of visible light laser beam.The operator utilizes this visible sweep trace can make the scanner aiming within 18 feet distances.
Then, trigger is pulled on second gear.Because original trigger is in first gear for a long time, so selected long laser beam and long range sweep amplitude apart from usefulness.For trigger being pulled after second gear, the flat scanning mirror is with the long range sweep frequency and the amplitude vibration of routine, and the start detection loop.Poly-to photodetector by the light that solar concentrator lens with curved surface reflects, the output signal of photodetector is digitized after amplifying, and becomes digital signal, is handled by demoder again.Scanning is to realize by means of the public plane of oscillation mirror that is driven by scanning motor.Subsequently, be close to or the first laser lighting optical devices of short distance work for being best suited for, make that the amplitude of scanning motor drive signal is bigger, the second laser lighting optical devices for long range sweep make that the amplitude ratio of scanning motor drive signal is less.Various sweep velocitys make received optical signal frequency be limited on the frequency of standard signal treatment loop and canonical solution code loop.According to the technology that in first embodiment illustrate, carry out work thereafter.
In the short distance operative scenario, the operator makes scanner aiming bar code under short distance (from clinging to 24 inches).Then trigger is placed directly in the second gear place.Because trigger has the shortest residence time on first gear, logical circuit net 32 will be selected short distance laser diode 20 and short distance scan amplitude.At first, scanning motor produces visible horizontal scanning line with low speed vibration, and the operator can carry out the aiming of scanner according to this visible sweep trace, and scanning mirror moves with the aiming pattern.Then, scanning mirror is with the short distance sweep frequency and the amplitude vibration of routine, and the start detection loop.Be collected on the photodetector at the back light that reflects on the condenser, after the output signal of photodetector was exaggerated, being digitized became digital signal, and the latter is handled by the bar code decoding loop.
Fig. 4 is the Typical Disposition sketch map of the optical devices of combined two distance laser scanner of the present invention.Short distance visible laser diode assembly 40 and length are configured in the both sides of detection by the photodetector 44 of the laser emission of condenser 40 gatherings apart from visible laser diode assembly 42.In other embodiments, parts 40,42 can have different geometry sites with 44 configuration mode.
Fig. 5 and Fig. 6 are respectively the side view and the front elevations of the exemplary optical of combined two distance scanner of the present invention.Short distance visible laser diode assembly 50 is configured in the side nearby of the flat scanning mirror 54 that is driven by scanning motor 56 and driving mechanism 58, be positioned at shell 52 front ends near.Near the length that is configured in the short distance visible laser diode assembly 50 is thrown light on apart from visible laser diode assembly 62 apart from the plane length that mirror 60 had a near heating radiator 64 the flat scanning mirror 54 that is configured in shell 52 rear portions of turning back.From the turn back laser emission of mirror 60 of laser diode 62 directives, reflex on the oscillating scanning mirror 54 by the mirror 60 of turning back, toward the reflection of oscillating scanning mirror 54, the self-scanning device penetrates by the outgoing window again.
By the radiation of bar code figure laser light reflected, received by solar concentrator lens with curved surface 66, after its reflection, gather on the photodiode light detectors 68.As shown in Figure 6, flat scanning mirror 54 and solar concentrator lens with curved surface 66 the most handy known technologies become a single combined lens that is driven by scanning motor 56.
Fig. 7 is the structure of expression typical laser diode assembly and the sectional view of critical piece.Typical laser diode module 70 contains visible laser diode 74 and the punktal lens 78 of being pushed to shell 72 two ends respectively by spring 76.The laser beam that is accumulated in suitable distance by punktal lens 78 by the opening that is positioned at shell other end central authorities after, penetrate as laser beam.Under short distance laser diode module situation, lens 78 accumulate in laser beam at the focus place that is suitable for the short distance scanning work, and under growing apart from the laser diode combination situations, lens 78 accumulate in laser beam at the focus place that is suitable for long range sweep work.
In first preferred embodiment, short distance laser lighting optical devices and the long side nearby that all is configured in scanning mirror apart from the laser lighting optical devices are (for example, the position of the short distance laser diode module 60 among Fig. 5 and Fig. 6), they can be designed to be able to laser diode module any pattern work, that constitute single integral body in long distance or the short distance mode.In this embodiment, dispose two laser openings 80 ' and 80 ' adjacent to each other in the both sides of the assembly center line shown in the dotted line 82 of Fig. 7 (B), contain different curvature lens faces in the place ahead placement separately of these two openings and (be used to focus on perifocus on one side, another is used to focus on over focus), it is a compound lens that punktal lens is made into, and it has by two lens faces that focus is different that center line separated shown in the dotted line among Fig. 7 (B).Among the laser diode piece 74,, dispose two different laser diodes at the nearly rear of two laser openings 80 ' and 80 '.Because two laser diodes in the laser diode piece 74 are easy to laterally configuration side by side, are minimal types so be understood that laser diode self.
Fig. 8 can send the sketch map that connects the rifle type apparatus for reading of bar code that uses with combined two distance laser scanner of the present invention.Reading device 10 can specifically be done image and show that hand-scanner is arranged like that, and also can make a last workstation is fixed scanner.In the preferred embodiment situation, combined two distance laser scanning mechanism is placed in the shell 155 that has outgoing window 156.Laser beam is by this outgoing window 156, and directive is positioned at the bar-code marks of enclosure, scans.
Usually, outgoing beam 151 is to be produced the bar-code marks on the object of directive terminal number inch before device by the inside of the similar device of laser diode formula at reading device 100.Outgoing beam 151 scans according to scanning patter.The user is according to the principle of the bar-code marks that this scanning patter can transverse cuts will be read, the position of decision handheld apparatus.Detect by the photodetector in the reading device 158 from the light 152 of mark reflection.The processed and decoding of series of electrical signals for represented data light detecting device 158 generations of the bar code of regenerating.
In a preferred embodiment, reading device 100 is the rifle type reading devices that have the handle portion 153 that is similar to grips for handguns.Cocking 154 behind the bar-code marks that user's aiming will be read, light beam 151 and the net action of detecting device loop if device is the built-in battery formula, have just prolonged battery useful life.In the shell made from the plastics of light weight 155, except battery 162, the LASER Light Source of also having packed into, photodetector 158, optical devices and signal conditioning circuit net, and central processing unit CPU 140.The position had both allowed light beam 151 to penetrate at the light inlet window 156 of shell 155 front ends, also allowed reflected light to inject.Reading device 100 is to design by the device place point of aim that the user can leave bar-code marks.Promptly, device 100 had not both tightly been made a gift of with mark yet, and also transverse cuts does not move.Usually, such hand-held apparatus for reading of bar code is specified in several inches interior use of scope.
In addition, do to such an extent that have the function of portable computers in order to make reading device 100, so also be equipped with keyboard 148 and display 1490.
Continue the explanation of Fig. 8,, can use suitable lens 157 (perhaps poly-lens device) for scanning light beam being accumulated on the bar-code marks that is positioned on the suitable reference field.In addition, place to such an extent that can direct the beam onto on the optical axis of lens 157 such as the light source 146 of semiconductor laser photograph.Laser beam by oscillatory type scanning mirror 759 reflections of device on the scanning motor 160 that starts with trigger 154, passes through window 156 again and penetrates then by semitransparent mirror 147 and other lenses in case of necessity or light beam formation mechanism.If the only visible light that light source 146 sends can not contain aiming light in the optical devices.Because aiming light produces visible hot spot (it can scan with laser beam, also can be fixed) the samely, the user can utilize this visible light to make reading device aiming bar-code marks before cocking 154 in case of necessity.
Above, the several embodiment and the change shape thereof of combined two distance laser scanner of the present invention have been done detailed explanation, can understand disclosed content and principle thus, and use structure to a plurality of the replacing that the expert of the art shows.
The code name explanation
12 triggers
14 map ranging devices
16 change-over switch loop nets
18 short distance visible laser diodes
20 is long apart from visible laser diode
22 analog loopback nets
24 digitlization loops
26 switch boards
32 switch loop nets
40 short distance visible laser diode assemblies
42 is long apart from the visible laser diode assembly
44 photodiodes
46 condensers
50 short distance visible laser diode assemblies
52 shells
54 flat scanning mirrors
56 scanning motors
58 driving mechanisms
60 is long apart from the plane mirror of turning back
62 is long apart from the visible laser diode assembly
64 heating radiators
66 solar concentrator lens with curved surface
68 photodiode detectors
70 typical laser diode modules
72 package shells
74 visible laser diode pieces
76 springs
78 condenser lenses
80 central openings
80 ' two openings
82 center lines
100 apparatus for reading of bar code
140 central processing unit CPUs
146 light sources
147 semitransparent mirrors
148 keyboards
149 displays
151 outgoing beams
The reflected light of 152 incidents
153 handle portions
154 triggers
155 shells
156 light inlet windows
157 lens
158 photodetectors
159 oscillatory type scanning mirrors
160 scanning motors
162 batteries
170 bar-code marks
Claims (4)
1, be used for reading with photoelectric method the combined two distance laser scanner of the mark that has the different reflectivity zone, it comprises: contain to be useful on and make the laser scanning mechanism of laser beam at the scanning mirror of visual field interscan; Be used to collect condenser optics by being scanned the light that reflects the visual field; Detection is by the collected reflected light of described condenser optics, and the photodetector of generation and the corresponding electric signal of reflected light; It is characterized in that comprising:
The short distance laser lighting optical devices that are used for the short distance scanning work,
The length that is used for long range sweep work is apart from the laser lighting optical devices, and
Both can select to be used for the described short distance laser lighting optical devices action of short distance work in the visual field, also can select to be used for the selecting arrangement of the described length of long distance work in the visual field apart from the action of laser lighting optical devices.
According to the scanner of claim 1, it is characterized in that 2, described selecting arrangement contains the map ranging device of the distance that can detect the visual field internal object.
According to the scanner of claim 1, it is characterized in that 3, described selecting arrangement contains can manually select described short distance laser lighting optical devices or the described length hand switch apart from the laser lighting optical devices.
4, the combined distance laser scanning method of laser beam scanning, it comprises with scanning mirror makes laser beam scan the step of the other end from an end of visual field, and during the short distance scanning work, with the step of short distance laser lighting optical devices irradiation scanning mirror, it is characterized in that it may further comprise the steps:
When the long range sweep longer than short distance worked, with long step apart from laser lighting optical devices irradiation scanning mirror,
Collect by the step that is scanned the laser light reflected radiation of visual field institute with condenser optics, and
Detection is by the step of the laser emission of condenser optics direct light detecting device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92111185A CN1037379C (en) | 1992-09-29 | 1992-09-29 | Combined two distance laser scanner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN92111185A CN1037379C (en) | 1992-09-29 | 1992-09-29 | Combined two distance laser scanner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1085334A CN1085334A (en) | 1994-04-13 |
| CN1037379C true CN1037379C (en) | 1998-02-11 |
Family
ID=4945207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN92111185A Expired - Lifetime CN1037379C (en) | 1992-09-29 | 1992-09-29 | Combined two distance laser scanner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1037379C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411970C (en) * | 2004-12-09 | 2008-08-20 | 北京大学 | Method of realizing logic device addressing using light signal of different frequency |
| CN107871097A (en) * | 2016-09-26 | 2018-04-03 | 讯宝科技有限责任公司 | For reading the image-forming module and reader and method of target |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US8177134B2 (en) * | 2010-07-21 | 2012-05-15 | Hand Held Products, Inc. | Multiple range indicia reader with single trigger actuation |
| US10244180B2 (en) * | 2016-03-29 | 2019-03-26 | Symbol Technologies, Llc | Imaging module and reader for, and method of, expeditiously setting imaging parameters of imagers for imaging targets to be read over a range of working distances |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4897532A (en) * | 1985-02-28 | 1990-01-30 | Symbol Technologies, Inc. | Portable laser diode scanning head |
-
1992
- 1992-09-29 CN CN92111185A patent/CN1037379C/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4897532A (en) * | 1985-02-28 | 1990-01-30 | Symbol Technologies, Inc. | Portable laser diode scanning head |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100411970C (en) * | 2004-12-09 | 2008-08-20 | 北京大学 | Method of realizing logic device addressing using light signal of different frequency |
| CN107871097A (en) * | 2016-09-26 | 2018-04-03 | 讯宝科技有限责任公司 | For reading the image-forming module and reader and method of target |
| CN107871097B (en) * | 2016-09-26 | 2020-11-06 | 讯宝科技有限责任公司 | Imaging module and reader for reading an object and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1085334A (en) | 1994-04-13 |
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