CN1426570A - Scanner utilizing light pipe with diffuser - Google Patents
Scanner utilizing light pipe with diffuser Download PDFInfo
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- CN1426570A CN1426570A CN01808527A CN01808527A CN1426570A CN 1426570 A CN1426570 A CN 1426570A CN 01808527 A CN01808527 A CN 01808527A CN 01808527 A CN01808527 A CN 01808527A CN 1426570 A CN1426570 A CN 1426570A
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- light
- light source
- diffuser
- waveguide
- plane
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- 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
- G06K7/10712—Fixed beam scanning
- G06K7/10722—Photodetector array or CCD scanning
- G06K7/10742—Photodetector array or CCD scanning including a diffuser for diffusing the light from the light source to create substantially uniform illumination of the target record carrier
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- 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
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- 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
- G06K7/10712—Fixed beam scanning
- G06K7/10722—Photodetector array or CCD scanning
-
- 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
- G06K7/10712—Fixed beam scanning
- G06K7/10722—Photodetector array or CCD scanning
- G06K7/10732—Light sources
Abstract
A scanner that can include a light source (3810) emitting light through a light pipe (3820) to a detector array. The light pipe can include a reflective surface (3822) and a diffuser (3824). The reflective surface can reflect light (3815), directly or indirectly towards the diffuser and the diffuser can diffuse the light out of the light pipe. The light pipe can further include a reflective groove that reflects ligth from the reflective surface towards the diffuser. The diffuser can diffuse the light to an object that reflects the light to the detector array. The object may be a bar code, paper money, or any other object that can be scanned. The diffuser may be a variable diffuser.
Description
Technical field
The present invention is directed to scanner, specifically, at a kind of scanner that is incorporated in the light pipe system, it contains light forming variable diffuser.
Background technology
Current, the plain scan system as bar code identification system, all uses such as light emitting diode spot lights such as (LED), and is by a record.This system generally includes a plurality of bar code luminaires, and they are along a string bar code scanning.Such bar code luminaire is used in the shell that scanner head is housed, and is subjected to can making the reciprocal inswept bar code of this shell before sniffer in the described bar code identification system handles at bar code.In addition, also this bar code luminaire can be placed in the stationary installation, before described sniffer is handled described bar code, make bar code itself back and forth move past the bar code luminaire.
Regrettably, this bar code luminaire needs the shell and the stationary installation of large volume.Under the situation of laser scanning luminaire, this system need move a plurality of mechanical parts, as vibrating mirror and rotation mirror, and assembles eyeglass.Another shortcoming of laser scanner is the safety problem of eyes, and it may be risk-taking for the user of laser scanner.
Diffuser is useful in scanning system.But existing various diffusers can only be by a kind of diffusion angle diffused light unfortunately.Particularly existing various diffusers can not little by little change the diffusion angle along the diffusion axle.In addition, existing diffuser can not change the diffusion angle gradually according to the position of diffuser.
A current defective, the i.e. validity of identification diffuser in various application of also existing.Such as, in the application of scanner, just there is the defective of discerning diffuser validity.In addition, use, as also there being the defective of identification diffuser validity in scrambler and the sensor application at other.
Current scrambler can be used for expression object space or mobile digital coding.For example, these scramblers can be used for the wheel that turns to of Control of Automobile, calculate the described revolution that turns to wheel.Also these scramblers can be used for used direct current generator and other linear electric motors such as robot, the purpose in the middle of this has not lain in precision.In this application, scrambler can be used to calculate the revolution of motor, with the distance of determining that obstacle is removed.
But regrettably, these scrambler volumes are bigger, and occupy excessive space in the device that adopts them.For example, just can not be being that the mode on plane adopts these scramblers relatively.
All there is same problem in various scanners, such as scanner used in the bar code reader.Owing to need the irradiation of light and need to focus on, so existing scanner is in the system that adopts them and all occupy excessive space in the shell.For example, such scanner is as described various scramblers, just can not be being that the mode on plane is used relatively.
Summary of the invention
The invention provides a kind of scanner, this scanner can comprise light source, and light is emitted to light pipe and detector array.Described light source can be emitted to detector array with light by light pipe.Described light pipe can comprise the plane of reflection and diffuser.The plane of reflection can directly or indirectly reflect light towards diffuser, and diffuser can make light diffusion go out light pipe.Described light pipe also can comprise reflection groove, and it will reflect towards diffuser from the light of the described plane of reflection.Diffuser can be with light diffusion on target, and target reflects light to detector array again.Described target can be bar code, bank note, or any object that other can be scanned.Described diffuser can be various diffusers.
Various diffusers all comprise holographic media and diffusion pattern, and described diffusion pattern changes the diffusion angle gradually along holographic media, make it is that imperceptible diffusion angle changes for bare eyes.The diffusion pattern can comprise many diffusion patterns with different diffusion angles, and in order to realize changing the diffusion angle gradually, these diffusion patterns are crossovers each other.These diffusion patterns can be by 10% crossover each other of every kind of diffusion pattern area, and these diffusion patterns can change across with the axle of holographic media.
Can use the master of variable diffuser to realize variable diffuser.Utilize to use projection light light source, be arranged in the master that forms variable diffuser from the system of the perforate of the mask of the light path of light source projects and mask, the size variable of described perforate, and the described perforate of light transmission of passing mask.Described system can comprise a flat board, and wherein the perforate in the mask arrives on the described flat board light transmission mask, and the perforate that described light source can pass the light projection in the mask arrives each dull and stereotyped continuous crossover part.Described system also can comprise shadow shield, to interdict the light that some comes from light source projects.This system also can comprise first shielding of band perforate, and its perforate is in the light path, also comprises the secondary shielding of perforate, and its perforate is between described mask and flat board.The distance of each inter-module of described system and size all can project continuously on the described flat board and change along with light, to realize changing gradually the diffusion pattern on the flat board.This flat board with the diffusion pattern that gradually changes can be used to form the variable holographic diffuser with pattern like this, the feasible difference that does not observe between each variable diffuser pattern.
Also this variable diffuser can be used to detect the device or the sensor of light.Described sensor can comprise the device and the photo-detector of waveguide, light source, collimated light.The device that is used for collimated light can be a collimation lens, and described waveguide can be kept the collimation of light.The device that is used for collimated light can also be the variable diffuser that is placed in the waveguide, and wherein before light outgoing waveguide, variable diffuser collimates described light.Described light source and detector can be placed in the homonymy of the waveguide on the printed circuit board (PCB).One scrambler can be placed between described waveguide and the detector.Described waveguide can comprise metal end and contain a plurality of faceted sides.
By in sensor and scanner, adopting variable diffuser and/or waveguide and light pipe, can make sensor and scanner reduce size, such size be before without variable diffuser and light pipe can not obtain.In addition, by using variable diffuser and light pipe,, can improve the precision of scanner uni sensing because reduced size and more accurate diffusion pattern.In addition, by using variable diffuser,, show more accurately so can access visually because be not aware of the variation between the different diffusion angles.
Description of drawings
Hereinafter with reference to accompanying drawing diffusion the preferred embodiments of the present invention, wherein similarly label is represented like, wherein:
Fig. 1 is a kind of example key diagram of making the variable diffuser method;
Fig. 2 is the example key diagram on a plane;
Fig. 3 is the example key diagram of a mask;
Fig. 4-the 7th, the example key diagram of change mask upper shed width;
Fig. 8 is the example key diagram of a plurality of overlapping diffusion patterns;
Fig. 9 is the example key diagram of plane moving direction;
Figure 10 is the example key diagram of various diffusion patterns;
Figure 11 is the example key diagram of plane moving direction;
Figure 12 is the example key diagram of various diffusion patterns;
Figure 13-the 16th changes A/F and example key diagram highly;
Figure 17 is the example key diagram of diffusion pattern;
Figure 18 is the example key diagram of plane moving direction;
Figure 19 is the example key diagram of diffusion pattern;
Figure 20 is the example key diagram of plane moving direction;
Figure 21 is the example key diagram of diffusion pattern;
Figure 22 is an example key diagram of making the variable diffuser system;
Figure 23-the 26th, the example key diagram of change slit and forging die size;
Figure 27 is the example key diagram of gained diffusion pattern on the plane;
Figure 28 is the example key diagram of the variable diffuser of symmetry;
Figure 29 is the example key diagram of asymmetric variable diffuser;
Figure 30 is the example key diagram of variable diffuser in the demonstration backlight;
Figure 31 is a kind of example key diagram of sensor;
Figure 32 is the example key diagram of another embodiment sensor;
Figure 33 is the example key diagram of another embodiment sensor;
Figure 34 is a kind of example key diagram of bar code scanner;
Figure 35 is the example key diagram of another embodiment scanner;
Figure 36 is the example key diagram of another embodiment scanner;
Figure 37 is again the example key diagram of an embodiment scanner;
Figure 38 is a kind of example key diagram of light pipe system;
Figure 39 is the example key diagram of another embodiment light pipe system;
Figure 40 is a kind of example key diagram of light pipe system;
Figure 41 is the example key diagram of another embodiment light pipe system.
Embodiment
Fig. 1 is the example key diagram that first embodiment makes the system 100 of variable diffuser or variable diffuser principal plane.By the pattern on the described variable diffuser master is printed on the holographic media, described variable diffuser master can be used on holographic media, forming subsequently multiple variable diffuser.Described system 100 can comprise collimated light source, as laser instrument 110, and object lens 120, cylindrical lens 130, mask 140 and plane 150.The all component of system 100 can be set along the x axle.Plane 150 can be placed from mask 140 apart from the d place along the x axle.During work, laser instrument 110 can project light on the plane 150 by object lens 120, cylindrical lens 130 and mask 140, to form diffusion symbol or little spot symbol on plane 150.Can be according to little shape of spot required on the plane 150, change the size, shape of described object lens 120, cylindrical lens 130 and mask 140 and mutual edge distance mutually.
Can change cylindrical lens 130, on plane 150, to obtain special footprint or diffusion angle.Plane 150 can be the glass planar that is coated with water-fast photochromics or photoresistance material.Can change apart from d, to obtain special little shape of spot.
Fig. 2 is the example key diagram on the plane 150 of Fig. 1.Plane 150 and total system 100 can be placed in the x-y-z coordinate system.For example, can place plane 150 from mask 140 along the x axle be apart from the d place.
Fig. 3 is the example key diagram of the mask 140 of Fig. 1.Described mask 140 can comprise apart from one another by the first side mask 310 of distance w and the second side mask 320.Can be opening or the slit 230 of w in order in mask 140, to form width with described first side mask 310 and 320 combinations of the second side mask.The described first side mask 310 and the second side mask 320 can change mutual distance along the y axle of Fig. 2.During work, can change between described side mask 310 and 320 apart from w, to influence the distribution that laser instrument 110 projects the light on the plane 150.This variation can cause along the plane change of 150 diffusion angle.For example, big more apart from w between the mask of both sides can cause on the plane 150 the diffusion angle big more.More little apart from w between the mask of both sides can cause on the plane 150 the diffusion angle more little.
In other words, can change the width of described opening, with the light quantity of control by this opening 330.W is more little for width, and the light quantity by opening 330 is few more with causing, and this is directly corresponding to the profile that obtains on plane 150.Width w is narrow more, can cause the angle of narrow more ellipsoid, and width w is wide more, can cause wide more ellipsoid profile.
By exposure and then plane of motion 150, and change width w, the variation that can write down the diffusion angle at grade.Can carry out these adjustings, the angle that on plane 150, is suitably distributed by segmented mode.Correspondingly, can change the diffusion angle, make the diffusion pattern on the plane 150 overlapping by segmented mode.So, can form variable diffuser, this diffuser has the diffusion pattern of gradual change, this means that the diffusion angle is not enough to the sudden change of being awared.
In addition, can reconfigure plane 150, and the width w of adjustable openings 330, make that as light the diverse location place on plane 150 can change the diffusion angle when laser instrument 110 projects on the plane 150 along any axle of Fig. 2.In addition, can reconfigure plane 150, make change along with the width w of opening 330 by the mode that increases gradually, 150 overlapping from the light of laser instrument 110 projections in the mode that increases gradually along the plane.This 150 the overlapping change that can cause the diffusion angle along the plane.So the diffuser that is formed on the plane 150 of gained can make the variation of diffusion angle be difficult for being perceiveed by bare eyes at diverse location with different angle diffused lights.For example, project that the light on plane 150 can overlay plane 150 glazing projected areas 10%.Correspondingly, the plane of gained is variable diffuser, with the mode diffused light by the angle gradient that changes.
Fig. 4-the 7th, the example key diagram that the width w of mask 140 upper sheds 230 changes.For example, can make the width w variation of opening 230 reach 0.2mm, 0.5mm, 1mm and the 3mm A/F of distribution shown in Fig. 4-6.Fig. 8 is by the example key diagram of the overlapping diffusion pattern of the opening 230 gained 810-860 of varying width on the plane 150.During work, can change the width of opening 230 simultaneously along y axle plane of motion 150, to obtain diffusion pattern 810-840.
Fig. 9 is that plane 150 is along the example key diagram of y axle moving direction along with opening 230 changes width.According to a kind of preferred embodiment, mode that plane 150 is strengthened with level gradually along the y axle or progressive mode move.According to the change that increases gradually each time, light is incident upon on the plane 150, forms a plurality of overlapping or diffusion patterns of changing on plane 150.According to another embodiment, the variation that reaches opening 230 width of moving on plane 150 can be automatically, makes that when move on plane 150 opening 230 changes width, forms the diffusion pattern that changes on plane 150.Figure 10 is the example key diagram of the various diffusion patterns that can form on plane 150.It is 0.2mm, 0.5mm, 1mm and 3mm that diffusion pattern 1-4,5-8,9-12 and 13-16 correspond respectively to A/F.
Figure 11 is that plane 150 is along the example key diagram of z axle moving direction along with opening 230 changes width.According to a kind of preferred embodiment, move with the mode that vertically strengthens gradually, progressive mode or automated manner along the z axle on plane 150, such just like what Fig. 9 disclosed.Figure 12 is according to vertically move the various diffusion patterns that can form on plane 150.
Figure 13-the 16th changes the width w of mask 140 upper sheds 230 and the example key diagram of height h.In the present embodiment, can use a plurality of additional side masks to change the height of opening 230.Such as Figure 13-16 represent respectively such, can make the broadband w of opening 230 and height h change reach the opening that is of a size of 0.2 * 4m, 0.2 * 8mm, 0.2 * 16m and 0.2 * 32mm.Figure 17 is by the example key diagram that changes width gained diffusion pattern 1710-1740 on plane 150 of opening 230 respectively according to Figure 13-16.Along with the main angle of the change diffuser of described opening length changes.
Figure 18 is the change along with opening 230 sizes, and plane 150 is along the example key diagram of y axle moving direction.According to a kind of preferred embodiment, move along the y axle horizontal with progressive mode or continuation mode with increasing on plane 150.Utilize automatic operation system, plane 150 is moved along the y axle continuously.When the variation of each step increase, light projects on the plane 150, forms diffusion pattern that change or crossover on plane 150.Figure 19 is the example key diagram of the various diffusion patterns that can form on plane 150.
Figure 20 is the change along with opening 230 sizes, and plane 150 is along the example key diagram of z axle moving direction.According to a kind of preferred embodiment, move along the z axle with progressive mode or continuation mode with vertically increasing on plane 150, disclosed like that just like Fig. 9, in order to light is projected on the plane 150 aptly.Figure 21 is according to vertically move the example key diagram of the various diffusion patterns that can form on plane 150.
Figure 22 is an example key diagram of making the system 2200 of variable diffuser according to another embodiment.Described system 2200 can comprise laser instrument 2210, object lens 2220, first shielding 2230, mask 2240, shading piece 2250, secondary shielding 2260 and plane 2270.All parts of system 2200 can be placed along the x axle.First shielding can comprise opening 2235, and secondary shielding can comprise opening 2265.The plane that Figure 22 illustrates secondary shielding 2260 and places by a plurality of position P1-P4 along the x axle.System 2200 can be placed in the similar coordinate system of Fig. 2 on.During work, laser instrument 2210 can be projeced on the plane 2270 by object lens 2220, first shielding 2230, mask 2240, shading piece 2250 and secondary shielding 2260, forms the diffusion symbol on plane 2270.
The various sizes opening 2253 that but Figure 23-26 is respectively opsition dependent P1-P4 to be changed and the example key diagram of shading piece 2250.For example, Figure 26 is illustrated in P1 place, position and shields 2230 and very little or do not have a shading piece 2250 very greatly or not.Just like each figure of front disclosed like that, can be on plane 2270 successively and/or crossover and increase ground or form little spot of gained continuously.Figure 27 is the diffusion pattern of the variation of gained on plane 2270 from the size of change system 2200 each parts and position P1-P4 or the example key diagram of little spot pattern.Bigger circle is represented bigger angle.
Described system can be used for all kinds of variable diffusers, change scattering angle gradually by described diffuser.The increase variation that means scattering angle that gradually changes of described scattering angle is difficult for being perceiveed by bore hole.By making a plurality of diffusion pattern crossovers form this change gradually.Move a plane continuously when also can change and form, and automatically form a plurality of diffusion patterns continuously, so as to realizing this gradually changing by at least one opening in the mask.All kinds of variable diffusers that can realize can comprise the variable diffuser and the asymmetric variable diffuser of symmetry.
Figure 28 is the example key diagram of the variable diffuser 2800 of symmetry.The scattering angle of the variable diffuser of this symmetry can be symmetry along this diffuser and change.For example, this diffuser can change over 3 ° of diffuser center gradually from 20 ° of diffuser edge, returns 20 ° of relative another edge of diffuser.
Figure 29 is the example key diagram of asymmetric variable diffuser 2900.The scattering angle of this asymmetric variable diffuser can be asymmetric variation along this diffuser.For example, this scattering angle can gradually change over from the less contention of an end other end than wide-angle.In another example, according to the application that variable diffuser is wanted, described scattering angle can be along the diverse location place of this diffuser and is changed.
Figure 30 is the example key diagram of variable diffuser in the backlit display 3000.Described backlit display 3000 can comprise variable diffuser 3010 and be placed in the light source 3020 and 3030 of these variable diffuser 3010 opposite ends.During work, light source 3020 and 3030 can be backlit display 3000 light is provided.Variable diffuser 3010 can be by the angle reflected light that changes along these variable diffuser 3010 longitudinal axis.For example, described angle longitudinally can change to 3 ° of this 3,010 two edges of variable diffuser from 20 ° of these variable diffuser 3010 centers.In addition, this backlit display can an edge at variable diffuser 3010 comprise a light source.In such embodiments, variable diffuser 3010 can symmetrical manner changes scattering angle along the longitudinal axis of this variable diffuser 3010.
Figure 31 is the example key diagram of scrambler or sensor 3100.Sensor 3100 can comprise light source 3110, as LED, from this light source projects light 3115.Also comprise collimation lens 3120, encoder disc 3140, a plurality of apertures 3150 in described encoder disc 3140, and detector 3130, as photodetector.During work, light source 3110 projects light 3115 on the collimation lens 3120.3120 pairs of light 3115 of collimation lens collimate, in order to project on the encoder disc 3140.Described encoder disc 3140 can be around the axle rotation of this encoder disc 3140.Detector 3130 detects the light 3115 that passes each aperture 3150 in the encoder disc 3140.When encoder disc 3140 rotations, detector 3130 can detect the variation of light 3115.In addition, described a plurality of aperture 3150 can be arranged by specific pattern.By arrange each aperture 3150 by specific pattern, detector 3130 detects the variation of aperture 3150 aspects, thereby determines the position of encoder disc 3140.Detector 3130 can be given external device (ED) with signal, when what kind of speed to rotate to what degree around its axle with so that this device can be determined described encoder disc 3140.This external device (ED) can also be determined the position of encoder disc 3140 by the signal that detector 3130 is sent here.The system that is disclosed is not limited to various encoder disc.Can use the system that is disclosed with the page that moves or any other device that can in detector, use.
Figure 32 is sensor 3200 example key diagrams.Sensor 3200 can comprise the light source 3210 such as the LED class, from these light source 3210 projection lights 3215.Also comprise collimation lens 3220, waveguide 3230, encoder disc 3240, a plurality of apertures 3250 in described encoder disc 3240 such as the holographic optical tubing, and detector 3260, as photodetector, also have printed circuit board (PCB) (PCB) 3270.Available a plurality of pin 3280 is supported in waveguide 3230 on the PCB3270.Waveguide 3230 can have two ends 3233 and 3236.Be reflected light 3215, can make this two end 3233 and 3236 metallization.In addition, can make described two ends 3233 and 3236 by become the angle between 30 °-50 ° to be positioned with waveguide 3230 bottoms.Light source 3210 and detector 3260 are located substantially in the same plane, and the two can be invested on the PCB3270.
During work, light source 3210 projects light 3215 on the collimation lens 3220.3220 pairs of light 3215 of collimation lens collimate, in order to project on encoder disc 3240 and the detector 3260 by waveguide 3230.Described waveguide keeps light 3215 collimations, and makes light by arriving encoder disc 3240.Described encoder disc 3240 can be around the axle rotation of this encoder disc 3240.Detector 3260 detects the light 3215 that passes each aperture 3250 in the encoder disc 3240.When encoder disc 3240 rotation, detector 3260 can with the variation that detects light 3215 about sensor 3100 disclosed the same manners.
Figure 33 is the example key diagram of another embodiment sensor 3300, and wherein similarly parts are corresponding with the parts label among Figure 32.As shown in the figure, sensor 3300 need not to use collimation lens 3220.This sensor 3300 can use variable diffuser, is the variable mirror form, also promptly is positioned at metallized groove or a plurality of facet 3310 of waveguide 3230.These facets or variable diffuser can be arranged on 3380 places, bottom of waveguide 3230.When light 3215 during by waveguide 3230, these facets 3310 can make light be collimated.For example, described variable diffuser can be arranged on the bottom of waveguide 3230, and can adopt the reflection angle of variation, the result makes the light that has collimated leave deflector and arrives encoder disc 3240.In addition, waveguide 3230 does not need as represented light 3215 to be adjusted 180 °.Waveguide 3230 can be guided out the side of this waveguide 3230 light 3215, thereby encoder disc 3240 and detector 3260 can be arranged on a side of waveguide 3230.In addition, waveguide 3230 can guide lights 3215, makes to arrive the encoder disc 3240 and the detector 3260 that are set at waveguide 3230 tops in the top that can draw photoconduction this waveguide 3230.
Described scrambler can be used in the application of multiple automobile, such as the revolution that detects angle sheave.Also described scrambler can be used for application, determine the amount that robot arm moves such as robot.Therefore, described scrambler is to any situation diversity that all is widely used, and it is expected to be used for determining the position of target object or moving in the middle of this.
Figure 34 is the example key diagram of scanner 3400.Scanner 3400 can comprise shell 3410, light source 3420, from light 3425, a plurality of lens 3430, convergent lens 3440 and the detector array 3450 of light source 3420 emissions.The light emitting diode (LED) that described light source 3420 can be a mounted on surface.Have as shown in Figure 34, all parts of scanner 3400 can be invested on the shell 3410.
During work, light source 3420 emission light 3425, described light is throwed by each lens 3430.Each lens 3430 can have diffraction grating, makes light 3425 point to bar code 3460, and light 3435 is reflected there, returns convergent lens 3440.Convergent lens 3440 can focus on light 3425 and extend on the detector array 3450.The pattern that detector array 3450 can detector bar font code 3460 then.
Figure 35 is the example key diagram of another embodiment scanner 3500.Scanner 3500 can comprise light source 3510, from light 3515, light pipe or waveguide 3520, convergent lens 3530 and the detector array 3540 of light source 3510 emission.Described light source 3510 can be mounted on surface LED.In addition, described light pipe 3520 can have two sides, and they have metallized surperficial 3522, inner full-reflection (TIR) groove 3524 and variable diffuser 3526.
During work, light source 3510 can be launched light 3515, and described light enters light pipe 3520.Light 3515 can be reflected and leave metalized surface 3522 and arrive TIR grooves 3524.TIR groove 3524 can and point to variable diffuser 3526 again with light 3515 reflections.Then, variable diffuser 3526 focuses on light such as on the targets such as bar code 3530 again.Described variable diffuser 3526 can be made the part that makes it center away from scanner 3500, this part light 3515 with than this variable diffuser 3526 comparatively near the bigger angle of the part at scanner 3500 centers definite object again.Therefore, variable diffuser 3526 can have away from the low-angle diffusion at scanner 3500 centers with near the wide-angle diffusion at scanner 3500 centers.So, can make the more effectively directed bar code 3550 of light 3515.Then, bar code 3550 reflexes to convergent lens 3530 to light.Convergent lens 3530 can make light focus on the detector array 3540, there the pattern of detector array 3540 on can detector bar font code 3550.
Be reduced to size by the size that makes scanner 3400, can realize the design of more miniaturization less than scanner 3500.In addition, because before being detected 3540 detections of device array, the distance that light 3515 is passed by is very little, so less scanner 3500 can be more accurate.
Figure 36 is the example key diagram of another embodiment scanner 3600.Scanner 3600 can comprise light source 3610, from light 3615, light pipe 3620 and the detector array 3630 of light source 3610 emission.Described light source 3610 can be mounted on surface LED.In addition, described light pipe 3620 can have two sides, and they have metallized surperficial 3622, inner full-reflection (TIR) groove 3624 and variable diffuser 3626.
During work, light source 3610 can be launched light 3615, and described light enters light pipe 3620.Light 3615 can be reflected and leave metalized surface 3622 and arrive TIR grooves 3624.TIR groove 3624 can and point to variable diffuser 3626 again with light 3615 reflections.Then, variable diffuser 3626 focuses on light on the detector array 3630 again.Described variable diffuser 3626 can be made the part that makes it center away from scanner 3600, this part light 3615 with than this variable diffuser 3626 comparatively near the bigger angle of the part at scanner 3600 centers definite object again.Therefore, variable diffuser 3626 can have low-angle diffusion away from scanner 3600 centers, in the diffusion that wide-angle is arranged near scanner 3600 centers.
Figure 37 is again the example key diagram of an embodiment scanner 3700.Scanner 3700 can comprise light source 3710, from the light 3715 and the light pipe 3720 of light source 3710 emission.Described light source 3710 can be mounted on surface LED.In addition, described light pipe 3720 can have two sides, and they have metallized surperficial 3722 and reflective variable diffuser 3724.
During work, light source 3710 can be launched light 3715, and described light enters light pipe 3720.Light 3715 can be reflected and leave metalized surface 3722 and arrive described reflective variable diffuser 3724.Reflective variable diffuser 3724 can reflect light 3715 light pipe 3720 and point to light pipe again.In preferred embodiment first, before light 3715 went out light pipe 3720, variable diffuser can collimate described light 3715.So, described variable diffuser 3724 can be made the part that makes it center away from scanner 3700, this part light 3715 with than this variable diffuser 3724 comparatively near the bigger scattering angle of the part at scanner 3700 centers definite object again.Therefore, variable diffuser 3724 can have low-angle diffusion away from scanner 3700 centers, in the diffusion that wide-angle is arranged near scanner 3700 centers.
Figure 38 is the example key diagram of light pipe system 3800.This light pipe system 3800 can comprise light source 3810, from the light 3815 and the light pipe 3820 of light source 3810 emission.Described light source 3810 can be mounted on surface LED.In addition, described light pipe 3820 can have a side at least, and they have metallized surperficial 3822 and be the variable diffuser 3824 of reflective variable diffuser form.
During work, light source 3810 can be launched light 3815, and described light enters light pipe 3820.Light 3815 can be reflected and leave metalized surface 3822 and arrive described variable diffuser 3824.Variable diffuser 3824 can reflect light 3815 light pipe 3820 and point to light pipe again.In preferred embodiment first, before light 3815 went out light pipe 3820, variable diffuser 3824 can collimate described light 3815.So, described variable diffuser 3824 can be made part variable diffuser 3824 away from light source 3810, this part light 3815 with than this variable diffuser 3824 comparatively near the bigger scattering angle of the part of light source 3810 definite object again.Therefore, variable diffuser 3824 can have low-angle diffusion near light source 3810 places, in the diffusion that wide-angle is arranged away from light source 3810 places.
Figure 39 is the example key diagram of another embodiment light pipe system 3900.This light pipe system 3900 can comprise the light source 3910 that is positioned at this light pipe system one side, from light 3915, light pipe 3920 and the detector array 3940 of light source 3910 emissions.Described light source 3910 can be mounted on surface LED.In addition, described light pipe 3920 can have a side at least, and they have such as the reflecting surface of metalized surface 3922 and variable diffuser 3924.
During work, light source 3910 can be launched light 3915, and described light enters the side of light pipe 3920.Light 3915 can be reflected and leave diffuser surface 3924 and arrive detector arrays 3940.So, described variable diffuser 3924 can be made part variable diffuser 3924 away from light source 3910, this part light 3915 with than this variable diffuser 3924 comparatively near the bigger scattering angle of the part of light source 3910 definite object again.Therefore, variable diffuser 3924 can have low-angle diffusion near light source 3910 places, in the diffusion that wide-angle is arranged away from light source 3910 places.
Figure 40 is the example key diagram of another embodiment light pipe system 4000.This light pipe system 4000 can comprise light source 4010, from the light 4015 and the light pipe 4020 of light source 4010 emission.Described light source 4010 can be mounted on surface LED and the side that can be positioned at light pipe 4000.In addition, described light pipe 4020 can have a variable diffuser 4022 that is reflective variable diffuser.
During work, light source 4010 can be launched light 4015, and described light enters light pipe 4020.Variable diffuser 4022 can leave light 3915 reflections light pipe 4020 and point to light pipe again.So, described variable diffuser 4022 can be made part variable diffuser 4022 away from light source 4010, this part light 4015 with than this variable diffuser 4022 comparatively near the bigger scattering angle of the part of light source 4010 definite object again.Therefore, variable diffuser 4022 can have low-angle diffusion near light source 4010 places, in the diffusion that wide-angle is arranged away from light source 4010 places.
Figure 41 is again the example key diagram of an embodiment light pipe system 4100.This light pipe system 4100 can comprise the light source 4110 that is positioned at this light pipe system one side, from light 4115, light pipe 4120 and the light shaping diffuser 4140 of light source 4110 emissions.Described light source 4110 can be mounted on surface LED.In addition, described light pipe 4120 can have a side at least, and they have such as the reflecting surface of metalized surface or inner full-reflection face 4122 and variable diffuser 4124.
During work, light source 4110 can be launched light 4115, and described light enters the side of light pipe 4120.Light 4115 can be reflected and be left diffuser surface 4124.Variable diffuser 4124 can make light 4115 point to away light pipe 4120 again by light shaping diffuser 4140.Then, described light shaping diffuser 4140 can be shaped the light that light pipe 4120.So, described variable diffuser 4124 can be made part variable diffuser 4124 away from light source 4110, this part light 4115 with than this variable diffuser 4124 comparatively near the bigger scattering angle of the part of light source 4110 definite object again.Therefore, variable diffuser 4124 can have low-angle diffusion near light source 4110 places, in the diffusion that wide-angle is arranged away from light source 4110 places.
Described each scanner is not limited to bar code scanner.For example, can be with scanner 3500 as currency or bill acceptor.During work, such as currency is sent into vending machine.Then, scanner 3500 just can scan currency, with the face amount of check currency and definite currency.In this embodiment, the bar code of Figure 35 can be the currency that is suitable for operating and replaces.Detector array 3540 can be used to detect each symbol of currency.
Variable diffuser can be used in the various application, the sensor light source in showing as the mark that sets out, shop mark, exit marking, architectural lighting, gas situation mark, automobile demonstration, driving cabin demonstration, medical sensor, sensor illumination, the machine on the demonstration of elevator floor number, pavement marker, airport, unit, the banking terminal of GPS, plays occasionally commercial Application.
The particular combinations of each unit shown in the present invention is not limited to.Shown in these unit all can change mutually, to realize the advantage of each embodiment in the middle of other embodiment.For example, sensor 3300 combinations of the light pipe form shown in Figure 37-40 and Figure 33 before by scrambler 3240 light being delivered to detector 3260, can be realized suitable collimation.
Though describe the present invention by its various embodiments, for those people that are familiar with this area, obviously multiple conversion, remodeling and variation will occur.Correspondingly, there is as the present invention described herein each preferred embodiment be intended to explanation and non-limiting.Can make various conversion and unlikely disengaging marrow of the present invention and scope.
Claims (42)
1. the device of a scan light, it comprises:
Radiative light source;
Light pipe is placed in the path of the light of light emitted, and described light pipe comprises reflecting surface and diffuser, and described reflecting surface is towards the diffuser reflected light, and described diffuser makes light diffusion go out light pipe;
Detector array is received from the light of light emitted.
2. the device of scan light as claimed in claim 1 is characterized in that, described light pipe also comprises reflection groove, and towards the diffuser reflected light, and described reflection groove is towards described diffuser reflected light through reflection groove for wherein said reflecting surface.
3. the device of scan light as claimed in claim 1 is characterized in that, also comprises target, and wherein said target is towards the light of described detector array reflection from diffuser.
4. the device of scan light as claimed in claim 3 is characterized in that, described target comprises bar code, file, credit card, check, traveller's check, mechanical visual object and currency at least.
5. the device of scan light as claimed in claim 3 is characterized in that, also comprises convergent lens, and wherein said convergent lens is towards the light of described detector array focusing from described target reflection.
6. the device of scan light as claimed in claim 2 is characterized in that, described light source comprises the light emitting diode of Plane Installation.
7. the device of scan light as claimed in claim 1 is characterized in that, described diffuser comprises non-lambert (non-lambertian) diffuser that combines with at least one variable diffuser with prism structure.
8. the device of a diffused light, it comprises:
Holographic media;
The diffusion pattern that gradually changes along the holographic media scattering angle.
One of 9. the device of diffused light as claimed in claim 8 is characterized in that, in the middle of described angle is at least 45 ° and 135 °.
10. the device of diffused light as claimed in claim 8 is characterized in that, described diffusion pattern can comprise a plurality of diffusion patterns with different scattering angles, and these a plurality of diffusion patterns overlap each other, and forms the diffusion pattern that gradually changes along holographic media.
11. the device of diffused light as claimed in claim 10 is characterized in that, described a plurality of diffusion patterns about 10% of each diffusion pattern area that overlaps each other.
12. the device of diffused light as claimed in claim 10 is characterized in that, described diffusion pattern changes along the axle of holographic media asymmetricly.
13. the device of diffused light as claimed in claim 10 is characterized in that, described diffusion pattern changes along the axis linear of holographic media.
14. the device of diffused light as claimed in claim 10, it is characterized in that, at least also comprise that the elevator floor digital display shows, pavement marker, the mark that sets out on airport, shop mark, exit marking, architectural lighting, gas situation mark, automobile demonstration, driving cabin demonstration, medical sensor, sensor illumination, machine sensor light source, the unit of GPS, banking terminal, the machine in showing one of show, play occasionally in the middle of the commercial Application, they all contain holographic media.
15. a system that makes the variable diffuser master, it comprises:
The light source of projection light;
Mask in the path of light source institute projection light;
Opening in the mask, the size of this opening is variable, and makes light pass through described mask.
16. the system of making variable diffuser master as claimed in claim 15 is characterized in that, also comprises the plane, the opening in the wherein said mask makes light pass through mask and arrives described plane.
17. the system of making variable diffuser master as claimed in claim 16 is characterized in that described light source is projection light constantly, by the opening in the described mask, projects on the crossover part on described plane.
18. the system of making variable diffuser master as claimed in claim 16 is characterized in that described light source is projection light constantly, by the opening in the described mask, projects along axis on the crossover part on described plane.
19. the system of making variable diffuser master as claimed in claim 16 is characterized in that, also is included in the cylindrical lens in the path of light of light source projects.
20. the system of making variable diffuser master as claimed in claim 16, it is characterized in that, also comprise the shading piece that is placed in the relative side with light source of mask, described shading piece also can be placed in the path of light of light source projects, the part of described shading piece blocking light source projects light.
21. the system of making variable diffuser master as claimed in claim 17 is characterized in that, also comprises;
Be arranged in first shielding in the path of light source projects light;
Perforate in first shielding, the perforate in this first shielding makes a part of light of light source projects can pass through this opening.
22. the system of making variable diffuser master as claimed in claim 21 is characterized in that, also comprises:
Be placed in the secondary shielding on the relative side with light source of described mask, this secondary shielding also can be placed in the path of light of light source projects;
Perforate in the secondary shielding, the perforate in this secondary shielding make a part of light of light source projects can pass through this opening.
23. the system of making variable diffuser master as claimed in claim 21 is characterized in that, described secondary shielding is placed in the segment distance one by one that leaves described mask and light source, and described distance partly changes along with each crossover on described plane.
24. the system of making variable diffuser master as claimed in claim 17 is characterized in that, the size of the opening of described mask and secondary shielding partly changes with each crossover on described plane.
25. a method of making the variable diffuser master comprises the steps:
Place the plane in the light source front;
Then from light source light is transmitted on each crossover part on described plane.
26. the method for making variable diffuser master as claimed in claim 25 also comprises the steps:
Between described plane and light source, place the mask that wherein has opening;
Along with light source continues emission light and changes opening size in the described mask at every turn.
27. the method for making variable diffuser master as claimed in claim 26 also comprises the steps:
Between described mask and plane, place shading piece;
Change the size of described shading piece along with at least once continuing emission light.
28. the method for making variable diffuser master as claimed in claim 27 also comprises the steps:
Between described shading piece and plane, place shielding, have opening in the described shielding;
Continue emission light and change size in the described shielding along with each.
29. the method for making variable diffuser master as claimed in claim 26 also comprises along with each lasting emission light changing the distance of described plane from light source.
30. the device of a scan light, it comprises:
Waveguide;
Be placed in the light source of described waveguide one side, described light source is by described waveguide emission light;
The parts of collimated light;
Photo-detector, its detection light source is by light that waveguide provided.
31. the device of scan light as claimed in claim 30, it is characterized in that the parts of described collimated light comprise the collimation lens that is placed between light source and the waveguide, this collimation lens collimated light source is by light that waveguide provided, when light during by described waveguide, this waveguide keeps the collimation of light.
32. the device of scan light as claimed in claim 31 is characterized in that, also comprises printed circuit board (PCB), described light source and photo-detector all are placed on this printed circuit board (PCB).
33. the device of scan light as claimed in claim 30 is characterized in that, also comprises scrambler, described scrambler is placed between described detector and the waveguide.
34. the device of scan light as claimed in claim 33 is characterized in that, described scrambler is an encoder disc.
35. the device of scan light as claimed in claim 30, it is characterized in that, described waveguide has the first metallization end, the second metallization end and comprise a plurality of faceted sides, the described first metallized ends portion be positioned at waveguide with the relative end in the second metallization end.
36. the device of scan light as claimed in claim 35 is characterized in that, the described first metallization end and the second metallization end comprise the angular range that a plurality of faceted sides are in into 30 ° to 50 ° with described.
37. the device of scan light as claimed in claim 30 is characterized in that, described photo-detector be placed in close on described waveguide with light source the same side.
38. the device of scan light as claimed in claim 30 is characterized in that, the parts of described collimated light are variable diffusers.
39. a device that detects light, it comprises:
Waveguide;
Be positioned at the light source that closes on light pipe one side, this light source is launched light to waveguide;
Scrambler;
Photo-detector, the light that is provided by described waveguide and scrambler by light source is provided this photo-detector.
40. the device of a branch luminous intensity distribution, it comprises:
Light pipe;
Place the variable diffuser on the light pipe.
41. the device of a scan light, it comprises:
Radiative light source;
Be arranged in the waveguide from the path of source emissioning light, this waveguide comprises reflecting surface and diffuser, and described reflecting surface reflects light towards described diffuser, and described diffuser goes out described waveguide to light diffusion;
Detector array is received from the light of light source by described waveguide emission.
42. the device of scan light as claimed in claim 3 is characterized in that, described target comprises at least one in one group of bar code, file, credit card, check, traveller's check, mechanical visual object and the currency, so that described at least one group of device minimizes.
Applications Claiming Priority (2)
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| US51724000A | 2000-03-02 | 2000-03-02 | |
| US09/517,240 | 2000-03-02 |
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| CNB01808527XA Expired - Fee Related CN1327383C (en) | 2000-03-02 | 2001-02-27 | Scanner utilizing light pipe with diffuser |
Country Status (8)
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| EP (1) | EP1266342A4 (en) |
| JP (1) | JP2003525472A (en) |
| KR (1) | KR100933386B1 (en) |
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| AU (1) | AU2001238715A1 (en) |
| CA (2) | CA2708355C (en) |
| TW (1) | TW501359B (en) |
| WO (1) | WO2001065469A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CA2708355C (en) | 2012-05-29 |
| CA2406616C (en) | 2010-09-28 |
| CA2406616A1 (en) | 2001-09-07 |
| CA2708355A1 (en) | 2001-09-07 |
| KR20020081382A (en) | 2002-10-26 |
| EP1266342A4 (en) | 2005-03-30 |
| WO2001065469A1 (en) | 2001-09-07 |
| KR100933386B1 (en) | 2009-12-22 |
| CN1327383C (en) | 2007-07-18 |
| AU2001238715A1 (en) | 2001-09-12 |
| TW501359B (en) | 2002-09-01 |
| EP1266342A1 (en) | 2002-12-18 |
| JP2003525472A (en) | 2003-08-26 |
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