CN1034778C - High speed scanner with unit of high frequency and low stress - Google Patents
High speed scanner with unit of high frequency and low stress Download PDFInfo
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- CN1034778C CN1034778C CN93103944A CN93103944A CN1034778C CN 1034778 C CN1034778 C CN 1034778C CN 93103944 A CN93103944 A CN 93103944A CN 93103944 A CN93103944 A CN 93103944A CN 1034778 C CN1034778 C CN 1034778C
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Abstract
The present invention aims to provide a scanning mechanism in a scanner. The scanner repeatedly scans marks with different luminous reflectance. The present invention also relates to an action of the scanning mechanism for a high-speed scan in a two-dimension scanning mode or a multi-axis scanning mode. A scanning element composed of a scanning mirror is used in resonance asymmetric scanning elements (RASE); the scanning element is not installed on the quality center like the existing scanning element; however, the scanning element is installed along the upper side edge so that the quality center of the scanning element is consistent with a high-frequency rotary oscillating axis. The present invention makes the scanning element oscillate with high frequency; moreover, the present invention largely reduces the stress borne by the high-frequency rotary axis of the scanning element.
Description
The present invention relates to the mark that for example bar-code marks has different light reflectivities part is like that carried out repeatedly scanning mechanism in the scanner of scanning motion, the particularly action of the high-velocity scanning in the two dimension of the above-mentioned type scanner or the multiaxis scan pattern.
The present invention aims to provide a kind of scanning element efficient that makes and reaches maximum high speed two-dimension scanning scanning element, the type scanner that uses in scanner of the present invention and present this field is compared, can be with higher frequency action, and the stress that is subjected to when the mark on the subject matter is scanned is lower, therefore just can do the more action of large amplitude, and can increase the size that scanning element is a scanning mirror, maximum thereby the efficient of scanning element reaches.
With laser scanner to be located at pack or subject matter such as commodity on information scan or read, be the known technology in this area, be widely used in commerce.In various types of laser scanners, scanner head is housed, this scanner head contains the optical pickup resemble the barcode reader, and the laser beam that penetrates by barcode reader reads the information on the subject matter, promptly reads bar code.The laser scanner of particularly this barcode reader type is widely used in departments such as manufacturing, delivery and retail usually.For example, it can be assembled in the checkout counter of supermarket regularly, the commodity that are printed on bar code or pasting bar code when the surface are when being configured in the fixedly barcode reader top under the counter surface, just can note the commodity that the Gu volume is purchased, and this record (record of printing) is offered client.
Barcode reader or laser scanner also can be made the stent-type structure that stretches out on shopboard or frame countertop, can also make the small portable formula pistol-shaped structure with grips for handguns.
Usually, this gun type scanner is inswept this bar code on the distance of leaving a weak point of bar-code marks that prints on commodity or the subject matter, just can the information that bar-code marks provided be scanned.
Before, various optical pickup and the optical scanners that are used for bar-code marks on reading tag or the article have been developed.Bar-code marks is to open the interval of various width and the symbolism figure of the mark that forms by the lines sky of one group of various width, and the lines in this figure have different reflective characters with blank.Reader and scanner with this pictorial symbolization photoelectricity be transformed into electric signal, this electric signal is interpreted into alphanumeric character, is used for recording and narrating some characteristic of article and article.Be typically, these character representations are digital form, are used as the input of data processing equipment, and this data processing equipment is applicable to business such as the real-time information management, taking inventory control of retail point.The scanner of this GENERAL TYPE is disclosed for No. 4251789, No. 4369361, No. 4387297, No. 4409470, No. 4760248 and No. 4369361 by United States Patent (USP), please the cloth surname.
Shown in above-mentioned patent wherein several, an embodiment of this scanner specially refers to a kind of portable laser scanner head, the user can aim at the target and the mark that will read with this hand-held scanner head, specifically, be to use the light beam or the laser beam that penetrate from scanner head to aim at above-mentioned target and mark.
The light source of typical laser scanner is gas laser or semiconductor laser.As the such semiconductor device of the laser diode of scanner light source, little because of its size, price is low, save electric power receives an acclaim especially.The general scioptics of laser beam carry out the shaping of optics, form the beam spots of certain size in target range.Preferably make in the target range beam spots and different light reflectivities zone---the lines and the minimum widith in the blank that are mark are basic identical.
Bar-code marks is formed by several lines, is typically to be formed by the key element with various width rectangular shapes.The particular arrangement of these key elements limits one according to the rule of employed code or " charactery " appointment and define represented character.Lines and blank relative size are decided according to used code pattern.The density that is called mark by the number of the represented per inch character of bar-code marks.For desirable character string symbolism, the unit of some pattern arrangement is interlinked, make the corresponding group representation of each character of information by key element itself.In some charactery, adopt " beginning " of the uniqueness that begins and end of bar font code to reach " stopping " figure.A lot of different bar-code marks methods are arranged.In these characteries, UPC/EAN, code39, code128, codabar and interleaved 2 of 5 are arranged.
For ease of explanation, the character of being discerned and being defined by certain charactery is called legal character, this charactery nonrecognition, undefined character are called unallowable instruction digit.That is, the arrangement of the key element that can not decipher by given charactery, corresponding with one of this charactery (or difference do) unallowable instruction digit.
Can in giving the surface area of sizing, to represent or energy information stored amount in order increasing, to have developed several new bar-code marks methods in recent years.As the code 49 of one of these fresh code standards, symbol row is vertically stacked, replace only importing " two dimension " notion to extending lines in level.That is, lines and blank figure are not only delegation, but have several row to exist.About the structure of code 49, see also United States Patent (USP) No. 4794239.
The one dimension one-line scanning that general hand-held reader is carried out when reading these two-dimensional bars, just presents its defective.That is, must be with reader to aiming at line by line.Equally, multiple scaaning line reader owing to produce some sweep traces at an angle to each other, is not suitable for the two-dimensional symbols that reads code 49 types yet.
In known scanner, light beam scioptics or similar optical element are along there is the light path of bar-code marks target to advance towards the surface.This scanning is by the figure of a line of crosscut mark or one group of line, light beam is scanned repeatedly finish.Sweep unit or make the scanning of beam spots crosscut mark along the sweep trace of crosscut mark, the visual field of scanner is scanned, in sweep unit, can be packed into and adopt wherein a kind of or adopt the CD-ROM drive motor or the scanner motor of above-mentioned two kinds of scanning methods simultaneously.
Scanner also contains usually can catoptrical light activated element of detection of markings or photodetector.Therefore, photodetector is positioned at scanner, perhaps is positioned at light path.Be detected and be transformed to electric signal from a part of reflected light of mark reflection, the digital form of the represented character of scanning mark of serving as reasons deciphered electric signal by circuit or software.For example, the analog electrical signal that draws from photodetector can be transformed to digital signal, and this digital signal is the pulse width modulated digital signal of pulse width corresponding to the physical width of lines and blank.Then, according to specific charactery, the binary representation of the data of mark internal symbolization is decoded as represented alphanumeric character.
Decoding treatment process in the known scanner, as described below usually.Code translator is accepted the pulse width modulated digital signal from scanner, by the algorithm that software is carried out scanning is deciphered.If in the scanning begin and stop element and the character between them by success and intactly decipher, the process of then deciphering ends, available green light shows and/or the sound notification user that success is read in expression.If decoding is unsuccessful, code translator is accepted next scanning, carries out another time decoding for this scanning and attempts, and this processing procedure continues to proceed to scanning always to be deciphered fully, perhaps lasts till till the not more scanning.
Then, according to specific charactery, the binary representation of mark internal symbol data deciphered be alphanumeric character.
The optical instrument that can read bar-code marks is not only a laser scanner.In the barcode reader of other type, be equiped with detecting device based on charge-coupled device (CCD) (CCD) technology.Detector size in this reader equates greatly or basically than the mark that will read.Whole mark is by the rayed from reader, and each CCD unit is read out in turn, decision lines or blank existence.Though such reader is light, use easily, in order correctly to read mark, reader directly must be contacted mark, perhaps place it on the mark.This mode that reader and mark are directly contacted in some applicable cases, may not be good manner of execution, does not perhaps like for the user.
In brief, the present invention will develop a kind of scanner that large scale vibration at high speed scanning element (being scanning mirror) is housed, and support pattern of this large scale scanning element (being scanning mirror) and size are decisions like this: it can carry out scanning motion and only bear low stress with the high-frequency of for example 350Hz～1200Hz scope.Therefore, it is maximum that the size of scanning element and service efficiency reach, and available wide angle scanning is that amplitude is finished the high-frequency scanning motion, and in this high operating frequency, the stress that is applied on the scanning mirror can be suppressed in minimum simultaneously.And because the scanning mirror size is improved, the mission life of this element is also increased.
As previously discussed, the present invention will provide a kind of scanner indispensable, resonance asymmetric scan mode element (resonance asymmetric scan element:RASE) that is equiped with, the scanning element that constitutes by scanning mirror in this scanner, be not installed in scanning mirror mass centre not resembling before, but be installed on the spring that produces vibration usefulness along its upper edge.Like this, just can make scanning element, and can lower and be applied to scanning element, be i.e. stress on the scanning mirror high-speed rotating shaft with the action of higher frequency.That is, the vibration turning axle of high frequency rotation is consistent in fact with scanning mirror mass centre, but the stress that oscillating movement produces is extremely low and be reduced to tolerance degree sharp, so can carry out the high-frequency scanning motion.By improving the size and the installation constitution of scanning mirror on its unique clamping part of scanning mirror, can obtain to realize the effect of above-mentioned action.
As mentioned above, the invention provides a kind of enforceable, scanner that structure is unique.By the scanning element that scanning mirror forms, be installed on the U-shaped spring vibrating mass of scanner with novel clamping part, lateral margin is clamped and connected on this hold assembly and the scanning mirror, and the last lateral margin that is about to scanning mirror clamps.
Scanning element is that scanning mirror has such shape: its mass centre is consistent with high speed or high frequency turning axle on the vibrating mass.Like this, just can make the Hang Xu dynamic stress of appointing that produces in the scanning mirror installation region be reduced to lower degree, at this than under the low-stress, can easily make scanner move and use large-sized scanning mirror with high-frequency, therefore, not only improved the scanning motion quality significantly, and the mission life that has prolonged parts.
According to other aspects of the invention, scanning element, promptly scanning mirror is installed on the hold assembly that makes scanning element do the high frequency sweep action.The scanning mirror upper portion that lateral margin is fastened in the hold assembly is the narrower rectangle of width, and is divided into integral body with the bigger surperficial following side of scanning mirror, and the high speed of scanning mirror or dither turning axle have makes itself and scanning mirror mass centre consistent location.This hold assembly can be by clamping limb, and promptly the gripper clamp of bending constitutes to the inside, and this clamping limb is installed in the upper end of U-shaped spring, along the lateral margin extension of scanning mirror.This U-shaped spring is a vibrating mass of making dither.The scanning element of unique shape is that the upside side edge portions of scanning mirror is inserted in the flexible clip gripping arm of hold assembly, make high frequency, the vibration at high speed turning axle of scanning mirror consistent with scanning mirror mass centre, therefore, in the high frequency action of scanner, the vibrations stress value in the scanning mirror supporting construction greatly reduces.For this purpose, hold assembly and spring or the either party in them can be with the big and soft beallon manufacturings of physical strength.
The purpose of this invention is to provide a kind of scanning element, i.e. scanning mirror with unique shape.This scanning element is installed on the hold assembly that vibration is provided, and its mass centre is consistent with the vibration at high speed turning axle, has therefore reduced the stress in its supporting construction.
Another object of the present invention provides a kind of the above-mentioned type scanning mechanism that contains resonance asymmetric scan mode element, this resonance asymmetric scan mode element has scanning mirror, this scanning mirror has such size and mounting means, even scanning mirror is to vibrate under the consistent situation of high frequency turning axle in its mass centre with high speed.
Another purpose of the present invention provides a kind of new method of using the asymmetric resonance scan element of the invention described above, makes when carrying out the high speed two-dimension scan pattern, reduces the vibrations stress that is produced by the high frequency action.
Fig. 1 can assemble the resonate handheld gun shape laser scanner skiagraph of asymmetric scan mode element of the present invention.
Fig. 2 is the sectional drawing of exemplary scanning mechanism.
Fig. 3 is the local synoptic diagram of prior art scanning mechanism.
Fig. 4 is the local synoptic diagram of another embodiment of prior art scanning mechanism.
Fig. 5 is the summary sectional drawing of scanning mechanism of the present invention.
Fig. 6 is the summary front view (FV) of scanning mechanism of the present invention.
Fig. 7 is used for installation diagram 5 and scanning mechanism shown in Figure 6 is used for the hold assembly amplification stereogram that the clamping scanning element is a scanning mirror.
Fig. 8 is the stereographic map when on the hold assembly shown in Figure 7 scanning mirror being installed.
Fig. 9 is the initial stage sectional drawing that hold assembly of the present invention is inserted scanning mirror in expression.
Figure 10 represents the interstage after Fig. 9.
Figure 11 represents the terminal stage after Figure 10.
Figure 12 is that scanning mirror is that scanning element is installed in the summary lateral view on Fig. 7, the hold assembly shown in Figure 8.
Figure 13 is the stereographic map of the scanning mechanism of another embodiment of seeing from the place ahead.
Figure 14 is the stereographic map of the scanning mechanism shown in Figure 13 seen from the rear.
Figure 15 is Figure 13, the summary outboard profile of scanning mechanism shown in Figure 14.
Figure 16 is the sectional drawing along 16-16 profile line among Figure 15.
Among the figure, 100 is barcode reader, 140 is CPU, 146 is light source, 147 is semi-permeable mirror, 151 is outgoing beam, 152 is reflected light, 153 is handle, 154 is trigger, 155 is housing, and 156 is window, and 157 is lens, 158 is photodetector, 159 is vibrating mirror, and 160 is scanning motor, and 162 is battery, 170 is bar-code marks, 200,400,500 is scanning mechanism, 202,412,512 is hold assembly, 204,300,404,504 is the U-shaped spring, 206,208,302,304,406,410,508 is arm, 210,308,414,502 is scanning element (scanning mirror), 212,306,408,514 is permanent magnet, 214,516 is solenoid, 216,506 is support unit, 218 is base, 220,518 is lead, 222,520 is the coach spring parts, 416 is the upper end of scanning mirror 414,418 is the stem of scanning mirror 414,420,422 is clamping limb (clamp shape parts), and 424 is the surface of scanning mirror 414,426 are rotation (vibration) axle, 430 is ear-lobe portion (groove), and 432 is the shoulder of scanning mirror 414, and 522 is the bending part of spring 520,524 is the coupling part of spring 520,526 is screw, and 528 is the scaffold of scanner action component, and 530 is the supporting construction of solenoid 516.
Below, cloth surname description of drawings embodiments of the invention.
The laser scanner that summary is represented among Fig. 1 is that (this is a typical embodiment to handheld gun shape barcode reader 100, the present invention also can be applicable to the scanner of other kind shapes) a pistol folder is arranged the handle 153 of shape, as long as the user is the mark that aiming will be read, cocking 154, can launch light beam 151, and make the action of detecting device loop.If reader 100 is built-in power supply formulas, this mode of operation can conserve batteries.In the plastic casing 155 of lightweight, LASER Light Source 146, detecting device 158, photoelectric signal processing circuit, CPU140 and power supply (being battery) 162 is housed.The light inlet window 156 of housing 155 fronts allows outgoing beam 151 to penetrate and folded light beam 152 enters.Reader 100 is designed to such mode of operation: the user is positioned at reader 100 and leaves the bar-code marks certain distance, promptly with the mark point of aim non-contiguously, does the motion of crosscut mark.Typical this hand-held barcode reader is designated as at distance mark number inch or bigger distance range with interior action.
As shown in Figure 1, use suitable lens 157 (or lens combination), just scanning light beam can be concentrated on the mark 170 on the appropriate basic side.The such light source 146 of semiconductor laser diode is positioned at the position that its light beam can be imported into the axle of lens 157.Light beam is by semi-permeable mirror 147 and as required by other lens or beam-shaping structure.When trigger 154 was pulled, this light beam arrived vibrating mirror or the scanning element 159 that is installed on the scanning motor 160 that is moving.If only take place by invisible light source 146, in case of necessity, the visible point of light that also will make it to fix or fully similarly scan with laser beam.The user utilizes this visible light, before cocking 154 with the reader point of aim.
Fig. 2 represents to realize the typical scan mechanism 200 of two dimension or two scan patterns, and as shown in Figure 2, hold assembly 202 comprises the U-shaped spring 204 with a pair of arm 206 and 208.Reflective optical system is the free end that the such scanning element of scanning mirror 210 is fixed on arm 208, and permanent magnet 212 is installed in the free end of another arm 206.Solenoid 214 is fixed on the vertical support unit 216, and support unit 216 is fixed on the base 218.Electricity input lead 220 is to solenoid 214 supply incentive signals.212 one-tenth of arm 206 and permanent magnets integrally are fixed on the end 222a of flat spring members 222.The other end 222b of spring members 222 is fixed on the base 218.Flat spring 222 can be made with leaf spring, soft metal paper tinsel, flat suitable materials such as bar.Make by also available resilient, the soft suitable material of U-shaped spring structure 204,206,208 hold assemblies that constitute.Comparatively ideal material is a beallon.The quality of scanning mirror 210 can equate with the quality of permanent magnet 212, and in some cases, the quality of scanning mirror 210 can be far longer than the equivalent mass of U-shaped spring 204.
Under some environment, may wish to come mark is scanned with the grating type scan pattern.This scan pattern is that the horizontal scanning line from upside begins to advance downwards, passes the horizontal scanning line of a lot of by-level sweep traces until downside, and the cross cutting scanning area is so that cover the zone that will scan equably with one group of parallel horizontal scanning line.In order to obtain the raster type scans pattern, can be configured to make them in the internal vibration of mutually perpendicular plane on U-shaped spring 204 and flat spring 222.As shown in Figure 2, the arm of U-shaped spring 204 is in the X-Z in plane vibration, and flat spring 222 is in the X-Y plane internal vibration.Since this structure of hold assembly 202, scanning mirror, and promptly scanning element 210 just can and be done the angular oscillation motion between the 1st and the 2nd scanning end on the 1st and the 2nd circumferencial direction.And according to its shape and position separately, U-shaped spring 204 is typically the vibration with 200～800Hz at high-frequency range, and flat spring 222 is typically with about 50～200HZ vibration in low-frequency range.Mark is scanned required vibration amplitude, and optic requirement is at least 10～30 °.If will make hold assembly 202 increase the angular amplitude (for some is used, having such requirement) of sweep trace, the arm of U-shaped spring 204 can be made asymmetrical size, make the length difference of two arm, like this, scanning element is just made asymmetric resonance, therefore just is easy to reach the purpose that increases the sweep trace angular amplitude.In a certain embodiments, arm 208 can be done shortlyer than arm 206, the length ratio was at least 1: 2.After as described above U-shaped spring 204 being made asymmetrical size, the directions X sweep trace of grating type pattern becomes longer.
The U-shaped spring of this asymmetric size, compare with the U-shaped spring of symmetrical size, not only can make angular amplitude increase by 100%, and since node not on the sweep position of spring, therefore can prevent that metal fatigue and crackle from producing, help prolonging mission life.The structure of this form, the U-shaped spring only is being supported at its magnet end, can make the angular motion of magnet be reduced to some/one that scanning element is scanning mirror 210 angular motions, thereby the vibrations that are delivered on the pedestal is just little.
Fig. 3 and Fig. 4 are the examples of the prior art relevant with above-mentioned scanning mechanism, Fig. 3 represents to have the example of symmetric form U-shaped spring, it is the example of the U-shaped spring that do not wait of brachium that Fig. 4 represents to have asymmetric, and the two all exists various defectives, and these defectives can fully be overcome by the present invention.
Fig. 5 and Fig. 6 represent scanning mechanism of the present invention, and it is to improve to form on the scanning mechanism basis of Fig. 3 and prior art shown in Figure 4.Typical tuning-fork-type U-shaped spring 300 shown in Figure 3 has isometric arm 302 and 304, and permanent magnet 306 is installed in the free end of arm 302, and the free and bearing of arm 304 center that scanning element is a scanning mirror 308.Apart from r is that surface size is that the mass centre of scanning mirror of I is to the distance of high speed turning axle (coming down to the dither axle of scanning mirror).The stress that (scanning element that is actually in the scanner U-shaped spring 300 is in the installation place of scanning mirror 308) produces in the flexible part that U-shaped spring 300 limits can be expressed from the next basically:
S=(6/wt
2) α (2 π f)
2M[(I
2/ 12)+r
2] in the formula, the stress in the S=hold assembly (flexible part or spring)
The width of w=flexible part (width of U-shaped spring 300)
The thickness of t=flexible part (spring 300)
α=(scanning mirror) maximum angle of deflection
The frequency of f=vibration
The quality of M=scanning mirror
The size of I=scanning mirror (surface area)
The mass centre of r=scanning mirror is to the distance of high speed turning axle.
By following formula as can be known, the principal element of most of stress value in the control flexible part, be scanning mirror be the mass centre of scanning element 308 and high speed that flexible part is U-shaped spring 300 be between the high frequency turning axle apart from r.
Fig. 4 represents scanning mirror support unit shown in Figure 2 and asymmetric U-shaped spring 204 (arm 208 is than arm 206 much shorters) with graphic mode.Compare with the symmetrical U-shaped spring of Fig. 3, above-mentioned in this resonance asymmetric scan mode element lacked significantly apart from r value.Therefore, flexible part is the stress that produces in the U-shaped spring 204, and the minimizing value is r
2The function of (r square) difference.(with Fig. 3 etc. the stress that takes place in the long-armed U-shaped spring compare, reduced a great deal of).
R value from following formula is installed in scanning mirror on the hold assembly as can be known, and makes the mass centre of scanning mirror consistent in fact with high-speed rotating shaft (being actually the dither axle of scanning mirror); And, just can reduce by a larger margin that the flexible part on the scanning mirror installation site is the suffered stress S value of U-shaped spring in the scanning motion by making the r value that can obtain following formula be reduced to 0 structure to the design of scanning mirror shape, it is the most suitable making this stress S value.Above-mentioned flexible part is that the r value in the taseometer formula of spring is 0 o'clock, and the U-shaped spring is that flexible part is that suffered stress value greatly reduces in the scanning mirror vibration at scanning element.
According to the present invention, the supporting scanning element is that the end of the U-shaped spring galianconism of scanning mirror forms flexible clamp shape clamping limb, the large scale scanning mirror of shape novelty is installed in this clamp shape clamping limb with being held, can make stress value S be reduced to optimal low value like this.
Referring to Fig. 5,6,7 and 8, scanning mechanism 400 of the present invention is provided with the resonance asymmetric scan mode element that comprises flexible part, this flexible part is made of U-shaped spring 404, this U-shaped spring 404 has the 2nd arm 410 of the 1st arm 406 and Bi Di 1 arm 406 weak points, magnet 408 is fixed on the 1st arm 406, and the upper end of the 2nd arm 410 is the clamp structure 412 (the most handy beallon is made) that free end has a flexibility.As described later, it is scanning mirror 414 that the clamp structure 412 among the present invention is clamped scanning element, and it is installed.The width constriction of the upper end 416 of this scanning mirror, the stem 418 of formation rectangle.The both sides of clamp structure 412 bend inwards, and forming clamp shape parts is clamping limb 420 and 422, and the both side edges 418a of stem 418,418b are clamped by this clamping limb 420,422.The stem 418 of scanning mirror 414 is installed on the arm 410 between these clamping limbs 420,422, and the scanning mirror of stem 418 belows forms big surface 424, for use in scanning to Width and expansion downwards.High speed or high frequency turning axle 426 pass this surface 424 and extend.When being installed in scanning mirror 414 on flexible part or the spring 404, the installation site of its upside stem 418 should make that the center of scanning mirror 414 mass M is consistent with high-speed rotating shaft 426, like this, can make and reduce to 0 apart from r between the mass centre of scanning mirror and the turning axle.
Fig. 7 and Fig. 8 express the clamping limb 420,422 of clamp structure 412 and the upper end of spring arm 410 in more detail, can be clear that from Fig. 7, Fig. 8, and each flexible clip gripping arm 420 and 422 lower end are provided with ear-lobe portion 430 or groove.These ear-lobe portions 430 or groove make that clamping limb 420 and 422 is more flexible or connect the contact jaw on stem 418 and clamp structure 412 surfaces more flexibly.Therefore, as shown in Figure 8, the upper limb of scanning mirror shoulder 432 and the lower edge of ear-lobe portion 430 are joined, when clamping limb 420 and 422 times foldings, just scanning mirror can be fixed and be installed in the clamp structure flexibly.
Extremely shown in Figure 11 as Fig. 9, (material of this part is removed from the ear-lobe portion or the groove 430 of clamp shape clamping limb 420 and 422, when resetting, obtain bigger elastic force) an end, when up inserting limit 418a, the 418b of scanning mirror 414 stems 418, utilize the radius of the back of scanning mirror improve to install.Be about to scanning mirror and inject in the clamping limb, the scanning mirror lateral dimension in the clamp structure 412 increases.Therefore, as shown in figure 12, after the capital 418 of scanning mirror 414 is installed between clamping limb 420 and 422, surface configuration from scanning mirror, the dither turning axle 426 of scanning mirror and the mass M center of scanning mirror are consistent, thereby the stress that produces reduces significantly, and the prediction work life-span of resonance asymmetric scan mode element is prolonged.Its result, it is maximum that the efficiency of movement of scanning element reaches, and compares with the scanning mirror that uses in the structure before, not only can use larger sized scanning mirror, and available bigger amplitude, higher frequency are carried out scanning and done.Among this embodiment, scanning element of the present invention can adopt 0.8 inch * 0.8 inch large scale scanning mirror, can do the high frequency action of 350～1200Hz scope, and under the vibratory output of scanning mirror, the stress that is subjected to is low to the degree that can not destroy scanning element.
Figure 13 to 16 represents an alternative embodiment of the invention, and in this specific embodiment of scanning mechanism 500, scanning element is that shape and Fig. 5 of scanning mirror 502 is similar to scanning mirror 414 shown in Figure 12.But in this scanning mechanism 500, the low frequency flexible part that scanning mirror 502 is installed is that U-shaped spring 504 adopts the big flexible part of width, can be in the low-frequency range action of about 5～10Hz.At this moment, the free end of the arm 508 of U-shaped spring 504 is fixed on the support plate 506, and scanning mirror 502 is fixed on the other end by hold assembly 512 (similar to clamp structure 412 shown in Figure 12 with Fig. 7).Permanent magnet 514 stretches out from the back of support plate 506, is fixed on the end and support plate 506 of spring arm 508, and can to-and-fro movement in solenoid 516, solenoid is supplied to pumping signal by electric input lead 518.
As shown in the figure, among this embodiment, U-shaped spring 504 is preferably with respect to the width of tabular or flat high frequency spring 520, and promptly the axial length direction is changeed about 90 °, i.e. angulation.If desired, be fixed on down on the side bent portions 522 with the flat high frequency spring 520 of formations such as vibrin, coupling part 524 is fixed on the plate 506.The part 522 of spring 520 and 524 and U-shaped spring 504 can be made of beallon.Central authorities between the support structure 530 that the vibrin that is used for high frequency spring 520 is clipped in the support 528 that supports the scanner action component and supports solenoid 516 are with suitable screw 526 fastening fixing.Like this, as shown in Figure 1, can be used as module and be contained in the scanner shell.
The scanning mechanism structure novelty of this embodiment can not only be moved with above-mentioned extremely low frequency, and has improved the insulation for vibrations that scanning mechanism produces.
More than most preferred embodiment of the present invention is illustrated, obviously, do not exceeding under the inventive concept prerequisite, can do all changes to shape and details, therefore, shape and details illustrated and explanation are non-limiting among the present invention.
Claims (37)
1, a kind of scanner by to the mark emission light beam with different light reflectivities part with receive the reflected light that returns from above-mentioned mark and read above-mentioned mark, is characterized in that, has in this scanner that above-mentioned mark is scanned:
(a) scanning element;
(b) comprise the hold assembly of the 1st and the 2nd vibrating mass; The described the 1st is positioned at such position with the 2nd vibrating mass: they are respectively two vertical in plane vibrations; It is consistent with its vibration at high speed rotating shaft and make above-mentioned scanning element make the oscillating movement of certain angle in the 1st and the 2nd scanning direction between the 1st and the 2nd scanning end to make above-mentioned scanning element that its mass centre is installed into; And with the common vibration of angular oscillation motion centered by separately axle on the above-mentioned the 1st and the 2nd vertical scanning direction; And above-mentioned scanning element high speed and low speed vibration are rotated
(c) read starting apparatus; This device makes the motion simultaneously on the above-mentioned the 1st and the 2nd direction of scanning of above-mentioned scanning element, and make above-mentioned scanning element between the above-mentioned the 1st and the 2nd scanning end, do the vibration of certain angle simultaneously, along the above-mentioned the 1st and the 2nd direction of scanning emission light beam, above-mentioned mark is carried out the two-dimensional scan pattern.
2, scanner as claimed in claim 1 is characterized in that, the above-mentioned starting apparatus of reading moves above-mentioned scanning element on the direction of scanning, carry out raster scan pattern on above-mentioned mark.
3, scanner as claimed in claim 1 is characterized in that, the above-mentioned starting apparatus of reading moves above-mentioned scanning element on the direction of scanning, carries out comprehensive scan pattern on above-mentioned mark.
4, scanner as claimed in claim 1 is characterized in that: above-mentioned the 1st vibrating mass is made of the U-shaped spring with a pair of arm, and above-mentioned scanning element is installed on the free end of one of above-mentioned arm.
5, scanner as claimed in claim 4 is characterized in that, above-mentioned the 2nd vibrating mass is fixed on by an end on another arm of above-mentioned U-shaped spring, and the flat shape spring on the other end fixed pedestal constitutes.
6, scanner as claimed in claim 5, it is characterized in that: above-mentioned read starting apparatus contain the responsing excitation signal, by electrically driven (operated), make the vibration of above-mentioned hold assembly, make above-mentioned scanning element make the actuator of angular vibration in the 1st and the 2nd direction, above-mentioned actuator contains the solenoid of be with path and be installed in the magnet that above-mentioned path moves of coming in and going out of doing on the above-mentioned hold assembly in the magnetic field of above-mentioned coil.
7, scanner as claimed in claim 6 is characterized in that: above-mentioned magnet is installed on the above-mentioned hold assembly spare, and connects the attitude point near the other end of above-mentioned flat spring and above-mentioned another arm of U-shaped spring.
8, scanner as claimed in claim 6, it is characterized in that, above-mentioned the 1st vibrating mass vibrates at high-frequency range, above-mentioned the 2nd vibrating mass vibrates in low-frequency range, like this, response be added on the above-mentioned coil by the 1st signal with high-frequency range and have the drive signal of the 2nd signal stack of low-frequency range, on above-mentioned mark, carry out the raster type scans pattern.
9, scanner as claimed in claim 4 is characterized in that: the size of the arm of above-mentioned U-shaped spring is asymmetric.
10, scanner as claimed in claim 6 is characterized in that: the mass centre of above-mentioned scanning element, depart from the axle that solenoid and above-mentioned magnet form.
11, scanner as claimed in claim 10, it is characterized in that: the recuperability of the centrifugal generation of the quality of above-mentioned scanning element, make above-mentioned flat spring do twisting vibration at high-frequency range along the 1st direction of scanning, above-mentioned U-shaped spring is vibrated along the 2nd direction of scanning in low-frequency range, the drive signal of response high and low frequency stack is carried out raster type scans on above-mentioned mark.
12, scanner as claimed in claim 5 is characterized in that: above-mentioned U-shaped spring is that the leaf spring by bending forms.
13, scanner as claimed in claim 1 is characterized in that: above-mentioned scanning element scans above-mentioned mark with the frequency of 150～1200Hz scope approximately.
14, scanner as claimed in claim 1 is characterized in that: above-mentioned mark is a bar-code marks, and above-mentioned scanner is a barcode reader.
15, scanner as claimed in claim 4, it is characterized in that, hold assembly on the arm of the above-mentioned vibrating mass that scanning element is installed is formed by the flexible clamp section that bends inwards on above-mentioned arm both side edges, above-mentioned scanning element has the stem of width constriction at the one end, this stem is clamped between the clamp section of each bending, flexibly is installed on the above-mentioned arm.
16, scanner as claimed in claim 15 is characterized in that, in order to increase the degree of flexibility that above-mentioned scanning element is installed, in the above-mentioned lower end that respectively bends the clamp section that forms, forms the ear-lobe portion that accepts above-mentioned scanning element stem.
17, scanner as claimed in claim 16, it is characterized in that, above-mentioned scanning element has scanning mirror, this scanning mirror has the back of convex curvature and the stem of width constriction, this stem has the lateral margin that can insert between the above-mentioned bending clamp section, above-mentioned scanning mirror is injected above-mentioned clamp section after, the above-mentioned arm surface of this stem of clamping is consistent with the section configuration of stem, like this, just strengthened being clamped and connected of above-mentioned clamp section and scanning mirror.
18, scanner as claimed in claim 15 is characterized in that: the clamp section of above-mentioned at least bending and scanning element installing component are nonferrous alloy systems.
19, scanner as claimed in claim 18 is characterized in that, above-mentioned nonferrous alloy is a beallon.
20, the reflected light of a kind ofly use to the mark emission light that different light reflectivities part is arranged, accepting to return from above-mentioned mark, the device that above-mentioned mark is scanned read the method for mark, it is characterized in that following steps are arranged:
Make scanning element between the 1st and the 2nd scanning end position, on the 1st and the 2nd direction of scanning, make the oscillating movement of certain angle,
The the 1st and the 2nd vibrating mass is in two vertical in plane vibrations, making itself and axle with above-mentioned scanning element is the common vibration of angular oscillation motion of the 1st and the 2nd vertical scanning direction at center, make the above-mentioned scanning element that is installed on the hold assembly do at a high speed and the low speed rotation vibration, the mass centre of this scanning element is consistent with its vibration at high speed turning axle
Response makes above-mentioned scanning element motion by above-mentioned when reading the action on the 1st and the 2nd direction of scanning that starting apparatus causes, and side by side make above-mentioned scanning element between the above-mentioned the 1st and the 2nd scanning end, carry out angular oscillation, along the above-mentioned the 1st and the 2nd direction of scanning emission light beam, on above-mentioned mark, carry out the two-dimensional scan pattern.
21, method as claimed in claim 20 is characterized in that, above-mentioned scanner is carried out raster scan pattern on above-mentioned mark.
22, method as claimed in claim 20 is characterized in that, above-mentioned scanner is realized comprehensive property scan pattern on above-mentioned mark.
23, method as claimed in claim 20 is characterized in that, above-mentioned the 1st vibrating mass is to be made by the U-shaped spring with a pair of arm, above-mentioned scanning element is installed on the free end of an arm in the above-mentioned a pair of arm.
24, method as claimed in claim 23 is characterized in that, above-mentioned the 2nd vibrating mass is another arm end that is fixed on above-mentioned U-shaped spring by an end, and the other end is fixed on that flat spring on the pedestal forms.
25, method as claimed in claim 24, it is characterized in that, the above-mentioned starting apparatus of reading contains the response electromotive force and moves, makes above-mentioned hold assembly to vibrate, make above-mentioned scanning element make the actuator of angular oscillation in the 1st and the 2nd direction of scanning, above-mentioned actuator contains the solenoid of being with path, on above-mentioned vibrating mass, magnet is installed, when above-mentioned coil electricity, can the come in and go out motion of above-mentioned path of this magnet.
26, method as claimed in claim 25 is characterized in that, above-mentioned magnet is installed on the above-mentioned vibrating mass, and makes it abutment near another arm of the other end of above-mentioned flat spring and above-mentioned U-shaped spring.
27, method as claimed in claim 25, it is characterized in that, the 1st signal with high-frequency range frequency is added on the above-mentioned coil with the drive signal that the 2nd signal with low-frequency range frequency is formed by stacking, respond this signal, make above-mentioned the 1st vibrating mass vibrate at above-mentioned high-frequency range, above-mentioned the 2nd vibrating mass is vibrated in above-mentioned low-frequency range, on above-mentioned mark, carry out the raster type scans pattern.
28, method as claimed in claim 23 is characterized in that, the arm of above-mentioned U-shaped spring is made asymmetrical size.
29, method as claimed in claim 25 is characterized in that: the mass centre of above-mentioned scanning element, depart from the axle that solenoid and above-mentioned magnet form.
30, method as claimed in claim 29, it is characterized in that, the recuperability of the centrifugal generation of the quality of above-mentioned scanning element, make above-mentioned flat spring do twisting vibration at high-frequency range along the 1st direction of scanning, above-mentioned U-shaped spring is vibrated along the 2nd direction of scanning in low-frequency range, the drive signal of response high and low frequency stack is carried out raster type scans on above-mentioned mark.
31, method as claimed in claim 20 is characterized in that, above-mentioned mark is by the frequency sweeping of 150～1200Hz scope.
32, method as claimed in claim 20 is characterized in that, above-mentioned mark is a bar-code marks, and above-mentioned scanister is a barcode reader.
33, method as claimed in claim 23, it is characterized in that, the free end of the vibrating mass arm of above-mentioned scanning element is installed, has the flexible clamp section that bends inwards in the arm both sides, one end of above-mentioned scanning element has the stem of width constriction, this stem is clamped between the clamp section of bending, flexibly is installed on the above-mentioned arm.
34, method as claimed in claim 33 is characterized in that, in order to increase the installation degree of flexibility of above-mentioned scanning element, in the lower end of above-mentioned each clamp section that bends, forms the ear-lobe portion that accepts above-mentioned scanning element stem.
35, method as claimed in claim 34, it is characterized in that, above-mentioned scanning element has scanning mirror, this scanning mirror has the back of convex curvature and the stem of width constriction, this stem has and can insert lateral margin between above-mentioned clamp section from above-mentioned ear-lobe end, above-mentioned scanning mirror is inserted above-mentioned hold assembly after, it is consistent with the stem section configuration that the surface portion of arm of above-mentioned stem in clamping, like this, just strengthen being clamped and connected of above-mentioned clamp section and scanning mirror.
36, method as claimed in claim 33 is characterized in that, the clamp section of above-mentioned at least bending and scanning element installing component are nonferrous alloy systems.
37, method as claimed in claim 36 is characterized in that, above-mentioned nonferrous alloy is a beallon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93103944A CN1034778C (en) | 1993-04-09 | 1993-04-09 | High speed scanner with unit of high frequency and low stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93103944A CN1034778C (en) | 1993-04-09 | 1993-04-09 | High speed scanner with unit of high frequency and low stress |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1093478A CN1093478A (en) | 1994-10-12 |
| CN1034778C true CN1034778C (en) | 1997-04-30 |
Family
ID=4984919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93103944A Expired - Lifetime CN1034778C (en) | 1993-04-09 | 1993-04-09 | High speed scanner with unit of high frequency and low stress |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1034778C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7182262B2 (en) * | 2003-03-13 | 2007-02-27 | Symbol Technologies, Inc. | Inertial drive scanning arrangement and method |
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 |
-
1993
- 1993-04-09 CN CN93103944A patent/CN1034778C/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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1093478A (en) | 1994-10-12 |
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