CN1088702A - Bar-shaped reading apparatus - Google Patents
Bar-shaped reading apparatus Download PDFInfo
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- CN1088702A CN1088702A CN 92113728 CN92113728A CN1088702A CN 1088702 A CN1088702 A CN 1088702A CN 92113728 CN92113728 CN 92113728 CN 92113728 A CN92113728 A CN 92113728A CN 1088702 A CN1088702 A CN 1088702A
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Abstract
A kind of bar-shaped reading apparatus that can read the bar code of various density with the operation angular region of broadness, its light-emitting component, optical detection device and relevant circuit network dispose to such an extent that can access from being scanned two data passages that bar code begins.Two passages have different resolution.Even the density of operation angle and bar code changes to some extent, have in two passages of different resolution and have at least to be suitable for detecting the whole or most of of bar code data.The data that can produce correct result's passage can directly be used.Even two passages self all can not produce correct result, by analyzing the data of each passage, the correct part in the data is combined, also can produce a correct decoded result.
Description
The present invention relates to be used for reading the device of optical mask information, specifically, be used for reading the modified form bar-shaped reading apparatus of bar code.
Bar code is that optical mask information can often be seen.Bar-code marks generally is made of a series of rectangular bright area (at interval) and dark areas (bar shaped).The width of bar shaped and (or) at interval width has been represented encoding information between the bar shaped, the specifying number and arrange of these key elements represented character.In normalized code system, specified the element arrangements of each character, width that key element can have and at interval, how mark number of characters that can comprise or the length of mark to change etc.
For to the bar-code marks decoding, obtain proper messages, apparatus for reading of bar code produces the analog electrical signal that representative is scanned mark by mark is scanned.Reading device is known various forms, and the bar-shaped reading apparatus that is provided with light-emitting component and detector at the bar internal fixation is one of them.For this situation, the user makes bar move along mark with hand.For other reading device, the optical scanner light beam, laser beam is for example removed to scan mark and is detected from the light of mark reflection by photo-detector.No matter for which kind of situation, photo-detector all detects the light that reflects from the detection spot of scanning mark, and produces the analog scan signal of conventional letter information.
Aristogrid is handled analog scan signal, produces pulse signal.The width of pulse is corresponding with the width and the interval width between bar shaped of bar shaped respectively with each interpulse interval.Aristogrid has the function that edge finder is a waveform shaping circuit, and Aristogrid is represented the edge of bar shaped by which point in the preset threshold decision simulating signal.In fact, threshold level has defined reading device and has identified bar shaped or signal section at interval.
The reading device of above-mentioned form be have the output that can produce an Aristogrid and (or) single-channel mode of a processing chain of a digitizing output.
Pulse signal from Aristogrid is admitted to demoder.Demoder is at first measured from the pulse width of the signal of Aristogrid and interval.Then, demoder is analyzed these pulse widths and interval, decodes correct bar code information.In this is handled, comprised the identification analysis according to defined correct literal of suitable code regulation and order.Also comprised at first identification in this processing as the ad hoc rules that is scanned the mark foundation.Usually this identification according to rule is called " identification automatically ".
Different bar codes has different information densities, contains the key element of the different numbers of the encode data of representing varying number in certain zone.The density of bar code is higher, bar shaped key element and just narrower at interval.Because printing high density mark is difficult on suitable medium, thus many be printing low-density mark.
Usually, apparatus for reading of bar code has definite resolution, represents with the size of effectively surveying spot mostly.The resolution of reading device depends on the combination of two above factors in program in the threshold level, demoder of the parameter of light-emitting component or photo-detector, the aperture of lens that matches with light-emitting component or photo-detector, Aristogrid or the above-mentioned factor.
Under the laser beam scanner situation, it is corresponding to the beam size at light beam point of irradiation place on bar code effectively surveying spot.Using the LED(light emitting diode) or the rod reader situation of similar light source under, effectively survey the size or the field of illumination of spot, or can be detected catoptrical that part effectively by photo-detector in the field of illumination.No matter specific reading device is set the size of surveying spot with which kind of method, photo-detector in fact all averages surveying the light that detects in the spot region.
As an example of prior art, United States Patent (USP) 4,675, the device of being recorded and narrated in 531 be with LED illumination strip font code, and barcode imaging on photo-detector.Resolution also is " surveying the spot size ", by the bore decision of photo-detector.In this device, photo-detector has also carried out actual average to the light that detects in the bore district.
Because the detection spot size of high resolving power reading device is little, can decode to the high density mark, yet because the printing quality of low-density mark is poor, it but is difficult correctly reading the low-density mark.Difficult especially for mark especially with the dot matrix way printing.In fact, the high resolving power reading device all is used as the bar shaped key element to the width of each point in the bar shaped respectively and has been detected.On the other hand and since the low resolution reading device the detection spot size big, can decode to the low-density mark.But for being used for the many marks of noise, the reading device of dot matrix bar code for example because its detection spot with wide cut reads, may appear at the situation of the slice shape of the high density mark that has two or more in the detection spot simultaneously.Therefore be applicable to that the low resolution reading device of dot matrix bar code can not correctly read the high density mark.Like this, no matter be any reading device, all be merely able to read bar code with the mark density in the limited range with fixed resolution.
In addition, for the situation that mark density is determined, because the cause of reading device resolution, the scope of operation angle (axis of reading device and the angle that is printed with the normal to a surface of bar code) is restricted.If the scope at operation angle is subjected to undue restriction, the user will keep the position of reading device, particularly bar-shaped reading apparatus when scanning bar code correctly be very arduous.If will add the element that constitutes the integrated data end device again in bar, keeping the reading device position so will be difficult especially thing.Size, weight and narrow operation angle make and are difficult to read a large amount of bar code informations, add anxious mood, will make the user produce resisting psychology to using bar code system.
As a kind of scheme of solution, for example can consider the resolution of adjusting reading device by the threshold value of adjusting Aristogrid is set, promptly survey the means of spot size.Yet this method need repeatedly scan respectively with various resolution.If scanning is carried out automatically, then appropriate resolution is just arranged at short notice, so the change of resolution will cause the reduction of unit efficiency because scanning has only.In fact, can think that this device is to scan with low velocity equivalent.If reading device is a rod-type, then the every change of resolution once, the user is barre run-down on information symbol manually.Like this, because the efficient that reads for the first time reduces significantly, increased user's anxious mood.
Just can understand that by the above why will expect to have can be with the work of operation angular region and the high-performance apparatus for reading of bar code that can read the bar code of the mark density range that belongs to broad of broadness in this field.
The purpose of this invention is to provide, particularly provide apparatus for reading of bar code easy to use and that efficient is high, performance is good more unskilled user.
The more specific purpose of the present invention is, by with a bar code scanner, promptly reading device scans, to obtain a large amount of information.
In detail, the objective of the invention is to utilize resulting additional information in single pass, with bar-shaped reading apparatus acquisition in the scope of the operation angle of broadness (being printed with the normal to a surface of bar code and the angle between the bar) and in the distance range of the bar of broadness and printed bar code intersymbol correct read the result.Because even the having a wide reach of operation angle for unskilled user, also can be removed scanning bar code with optimum comfortable angle, and read for the first time and just have very high success ratio.Be configured to handle, store and show the data that are scanned bar code or by the situation of the element of the integrated terminal device of interior data of establishing the keyboard input for adding at the bar-shaped reading apparatus built-in to be provided with, these characteristics are the i.e. easiness of the operation particular importance that will become also.
Another object of the present invention is, do not need information is repeatedly scanned, and only utilizes the bar code that just can be read width range by the resulting additional information of single pass.Like this, just might replace necessary plural reading device (each reading device must be to be designed to read certain to limit the interior bar code of density range) in the past with the reading device of a modified form.Like this,, also just got rid of aforesaid variety of issue, also got rid of the trouble of selecting to be applicable to the reading device of specific bar code density and adjusting reading device sensitivity for more unskilled user.
In order to work with the operation angle of wide region, the present invention uses effective detection spot of two different-diameters to survey optical mask information (being bar code).When the operation angle changes, owing to have one to be in correct focusing state in two detection spots, so can obtain the correct result that reads.And, if surveying spot, neither one is in correct focusing state, then under many situations, can decode correct information by in conjunction with the information that obtains from two detection spots.
In order to read the bar code of wide region density, reading device has two fetch channels, according to the correct decoded result of sweep signal acquisition of two passages.Usually, the resolution of a passage being arranged is to be complementary with the bar code density that is scanning.Yet, if not so, still might obtain a correct decoded result by in conjunction with the correct part in the data of two passages.
As first characteristics, the invention provides the method that enlarges the operation angular region of bar-shaped reading apparatus when reading optical mask information.The operation angle is the angle between the main shaft of bar-shaped reading apparatus and the normal to a surface that is printed with optical mask information.This method is passed through to dispose light-emitting component and detecting element, comprises (ⅰ) to carry out step optical detection and that (ⅱ) light that reflects from second effective detection spot with second diameter bigger than first diameter is carried out optical detection from first effective light of surveying the spot reflection with first diameter.First and second effective detection spots are inswept on optical mask information.Like this, (ⅰ) when first effectively surveys the inswept optical mask information of spot, detected optical mask information, produce first detectable signal, (ⅱ) when second effectively surveys the inswept optical mask information of spot, detected optical mask information, produced second detectable signal.First and second diameters of effectively surveying spot increase with the increase at operation angle proportionally.This method also further comprises the step that obtains the decoded form of an optical mask information according to above-mentioned two detectable signals.Even operation angle difference also has at least effective spot of surveying to have the suitable size that can correctly read optical mask information.
As second characteristic, the invention provides device corresponding to said method.In detail, this device is the bar-shaped reading apparatus that reads optical mask information with the operation angular region of broadness.Bar-shaped reading apparatus is equipped with light-emitting component and detecting element in bar, when have first diameter first when effectively surveying the inswept optical mask information of spot, light from first effective detection spot reflection is carried out optical detection, and produce corresponding with it first detectable signal.In addition, the arrangement of above-mentioned light-emitting component and detecting element makes, when have second diameter bigger than first diameter second when effectively surveying the inswept optical mask information of hot spot, light from second effective detection spot reflection is carried out optical detection, and produce corresponding with it second detectable signal.First and second diameters of effectively surveying spot increase with the increase at operation angle proportionally.Bar-shaped reading apparatus also further is equipped with the device that can represent a decoded form of optical mask information from above-mentioned two detectable signals derivation.More than like this result of design be under various operation corner conditions, to have at least one effectively to survey spot and have the suitable size that can correctly read optical mask information.
As the 3rd characteristics, the invention provides the method that reads optical mask information.This method comprises the step that makes optical mask information become optical information and is surveying the step that produces two data stream (they are all information-related with optical maskization) from the light time of optical mask information reflection.Two data stream have different resolution.This method obtains to represent a decoded form of optical mask information according to above-mentioned two data stream.
As the 4th characteristics, the invention provides the device that reads optical mask information.This device is equipped with sniffer, and promptly at least one can carry out optical detection and produce the detector of at least one electric signal of correspondence with it encoding information.This device also further is equipped with the device that can derive corresponding two data stream of resulting at least one electric signal when with above-mentioned detector optical mask information being scanned at every turn.Two data stream have different resolution equally.As the response to above-mentioned two data stream, demoder produces a data output representing the optical mask information that is detected.
As the 5th characteristics, the invention provides the optical profile type sniffer of modified form.The optical profile type sniffer contains along radiative first and second light-emitting components of first and second optical axises and surveys catoptrical optical detection device from first and second light-emitting components.The light that optical detection device acceptance reflects along the 3rd optical axis that parallels with first, second optical axis.The optical profile type sniffer also further contains first and second semi-archeds awl optical element that is arranged in a straight line with light-emitting component along first and second optical axises respectively that the rear portion is a spherical surface.When first semi-arched awl optical element has determined that first light-emitting component is luminous and optical detection device accept the scenery degree of depth of light time and survey the spot size.When equally, second semi-arched awl optical element has determined that second light-emitting component is luminous and optical detection device accept the scenery degree of depth of light time and survey the spot size.Two semi-arched awl optical elements can be identical, also can be different.When two semi-arched awl optical elements are identical, the same scenery degree of depth and quite symmetrical same detection spot size will be obtained.When two semi-archeds awl optical elements not simultaneously, they have been determined the different scenery degree of depth respectively and have surveyed the spot size.
As the 6th characteristics, the invention provides the photo-detector of modified form.Photo-detector of the present invention is the multichannel light detector that has formed two photosensitive areas on a substrate.Second photosensitive area be configured in first photosensitive area around.
The present invention comprise two data passages with different resolution and (or) can obtain two a plurality of systems that survey spots.For example, in simple embodiment situation, bar-shaped reading apparatus contains led light source and single photodiode detector.The signal of detector is by two different Aristogrids that interrelate with signal adjustment circuit.The Aristogrid that interrelates with a signal adjustment circuit produces high resolving power output, and the Aristogrid that interrelates with another signal adjustment circuit produces low resolution output.Microprocessor is decoded to the bar code data that is scanned by analyzing the digitalized data from two passages.Because the passage of such two kinds of resolution is arranged, carry out single pass with an apparatus for reading of bar code, just can either read intensive high resolving power bar code, can read low-resolution barcode (for example, the bar code that prints with the dot matrix mode) again.
In addition, also might use a light source and two detectors.In order to obtain two necessary different resolution, two detectors and (or) characteristic of the optical devices that are associated with them also otherwise same.In a useful especially embodiment, two detectors all are photodiodes, and they are made into concentric structure.That is to say that first photodiode is produced on central authorities, second photodiode is produced on around it.First analog to digital converter makes the first photodiode output signals digitizing, as the high-resolution data passage.Then first photodiode output signals and the second photodiode output signals addition.Second analog to digital converter makes this composite signal digitizing, as the data channel of low resolution.
Also have other method, two different light-emitting components and two detectors promptly are set.Each provides a passage of scanning information to light-emitting component and detector.The resolution of each passage depends on one or more optical element, i.e. the associating bore of the structure of the structure of light-emitting component, detector or a pair of light-emitting component and detector.
No matter adopt which kind of system can obtain two passages, microprocessor just can be analyzed the data from each passage, differentiates which passage and can derive correct decoded result, and select by the resulting result data of this passage as output data.If the bar code density that is reading and the resolution of passage do not match, then obviously read error will take place.
As an alternative, even can not realize all that for any one individual passage the situation that correctly reads, microprocessor also can make the data of two passages merge, to obtain a correct result.Which microprocessor picks out in the data that read at each passage partly is to be in to reach when reading within the parameter area that the resolution coupling allowed.Microprocessor abandons that all are in the data outside the permissible range in two channel datas, and microprocessor combines the data that are within the permissible range in two channel datas, provides a correct result that reads at last.
High performance rod-type apparatus for reading of bar code should possess following feature.
Built-in demoder,
Use the automatic identification of the widest mark representation,
Broad resolving range (up to high-density bar code, is 5～20 mils (1 mil equals 0.001 inch) also, from printing good bar code to the dot matrix bar code from low density bar codes),
Easily the symbol on plastics or the demixing plate is read.
If light-emitting component/detector module has the big scenery degree of depth and variable detection spot size, just can satisfy above-mentioned technical requirement.For example, when plastics or demixing plate are read, require to have the scenery degree of depth of 2mm usually, when reading the dot matrix bar code, require to have the detection spot size of 0.5mm.
Above-mentioned purpose, advantage and new feature in addition of the present invention though just partly mention in the following description, can be understood by reading over following explanation, it will be appreciated that if implement the present invention.
The simple declaration of accompanying drawing
Fig. 1 is of the present invention to the oblique view of the rod-type apparatus for reading of bar code of bar code scanning.
Fig. 2 is under the various operations angle of bar shown in Figure 1, two synoptic diagram of effectively surveying hot spot.
Fig. 3 is two of the present invention and effectively surveys the synoptic diagram of spot by the higher density bar-code marks time.
Fig. 4 is two and effectively surveys the synoptic diagram of spot by bar shaped key element in the low-density dot matrix bar-code marks time.
Fig. 5 is to use the circuit block diagram of first embodiment of the invention of the Aristogrid of different resolution.
Fig. 6 is the synoptic diagram of high-density bar code and the signal that Fig. 5 circuit is produced to this bar code scanning the time.
Fig. 7 is the synoptic diagram of the many noises bar code printed by dot matrix printer and the signal that Fig. 5 circuit is produced during to this bar code scanning.
Fig. 8 is to use the circuit block diagram of the second embodiment of the present invention of two light-emitting components and two photo-detectors.
Fig. 9 is to use the circuit block diagram of the third embodiment of the present invention of two light-emitting components and photo-detector and switch.
Figure 10 is the sectional view of optical profile type sniffer of the present invention.
Figure 11 is the sectional view along Figure 10 C-C line.
Figure 12 is the sectional view along Figure 10 A-A line.
Figure 13 is the sectional view along Figure 11 B-B line.
Figure 14 has drawn and has sent and the sectional view of the optical profile type sniffer of the present invention light, that be similar to Fig. 5 of the bar-code marks that throws light on from LED.
Figure 15 has planimetric sketch form, that have the photo-detector of two photosensitive areas that a photosensitive area surrounds another photosensitive area.
Figure 16 is to use the circuit block diagram of the fourth embodiment of the present invention of two photosensitive areas of a light-emitting component and Figure 15.
Figure 17 is the detail drawing of the photo-detector of Figure 15, shows the photosensitive area of two circles and carries out central photosensitive area ways of connecting by the insulated paths of photosensitive area around cutting off.
Figure 18 is the photo-detector detail drawing of Figure 15, show two rectangle photosensitive areas and utilize on the central photosensitive area welded gasket with cross over around the lead-in wire of photosensitive area carry out the another kind of mode that is connected of central photosensitive area.
Figure 19 is the expression demoder is derived a correct result's process according to the data stream of two different resolutions a process flow diagram.
Figure 20 signal that to be expression obtain according to bar-code marks, from two passages, and the scanning merge algorithm obtains the enlarged drawing of corrected signal.
Figure 21 is the sectional view of using the optical profile type sniffer that replaces among Fig. 8 embodiment.
Figure 22 is the sectional view of second embodiment of optical profile type sniffer along Figure 21 D-D line.
Figure 23 is the spherical aberration of employed lens in Figure 21 optical profile type sniffer and the synoptic diagram of focal length.
Symbol description
S, S
2Two effective spots of surveying that diameter is different
T
1, T
2Threshold value
L
1, L
2Lens
The T.SA spherical lateral aberration
The L.SA longitudinal spherical aberration
10 rod-type apparatus for reading of bar code
20 bar codes
The bar shaped key element of 23 dot matrix bar codes
41 LED(light emitting diodes)
42 PD(photodiodes)
43,44 signal adjustment circuits
45,46 Aristogrids
47 demoders
51 the one LED
52 the one PD
53 signal adjustment circuits
54 first Aristogrids
55 the 2nd LED
56 the 2nd PD
57 signal adjustment circuits
58 second mathematicization devices
61 the one LED
62 the 2nd LED
63 PD
64,65 switches
66,67 S/H(sampling keeps) circuit
68,69 signal adjustment circuits
70 first Aristogrids
71 second Aristogrids
72 clocks
75 crusts of the device
77 optical elements (arch awl 1 and arch awl 2)
79 sockets
131 LED
132 totalizers
133 signal adjustment circuits
134 first Aristogrids
137 signal adjustment circuits
138 second Aristogrids
141 substrates
142 first photosensitive areas
143 dead bands
144 second photosensitive areas
145,146 metal wires
147 welded gaskets
148 lead-in wires
149 narrow non-photosensitivity districts
151 substrates
152 first photosensitive areas
153 dead bands
154 second photosensitive areas
155,156 lead-in wires
157 welded gaskets
158 lead-in wires
Fig. 1 and Fig. 2 explanation, the present invention is with the bar-shaped reading apparatus scanning bar code time It is the scope which type of function to enlarge the operation angle by. Fig. 1 illustrates and makes 10 pairs of situations that bar code 20 scans of bar-shaped reading apparatus (following it is called simply " bar ") with hand. As shown in the figure, operation angle θ is defined as with the angle between the main shaft of the normal to a surface of optical mask information and bar 10. The operation angle θ of bar 10 shown in Figure 1 is about 45 °, corresponding to the b among Fig. 2. Yet bar 10 also can remain on the attitude of other angles in the wide range, for example 0 ° attitude (corresponding to 0 ° among Fig. 1).
The light-emitting component of bar 10 and detecting element dispose to such an extent that can produce two effective detection spot S with different-diameter1And S2 Fig. 2 is illustrated under the different operation angle θ, surveys spot S for two1And S2Different-diameter and shape. Under 0 ° of attitude, survey spot S for two1、S
2It must be concentric circles. Yet, when angle θ presses a, b, c, increase, survey spot S for two1、S
2Shape gradually become more and more big ellipse.
If reading device is bar-shaped reading apparatus, the user uses the hand carriage release lever, makes two to survey spot transversal scanning bar code. By scanning, (ⅰ) first effective spot of surveying is surveyed optical mask information when inswept optical mask information, produced first detectable signal, (ⅱ) second effective spot of surveying is surveyed optical mask information when inswept optical mask information, has produced second detectable signal.
When bar code or other optical mask information were scanned, first and second surveyed spot S1And S2Scan the other end from an end of optical mask information. Fig. 3 is illustrated under the smaller situation of operation angle θ, surveys spot S1And S2Transversal scanning to bar code 20. Because the user has kept 0 ° or near it operation angle at the sweep length range, survey spot S1、S
2Must be circular.
If the user changes the operation angle, then survey spot S1、S
2Size and shape will as Fig. 2, change. First and second effectively survey spot S1、S
2Straight The footpath increases pro rata with the increase at operation angle. The present invention surveys spot S according to two1、S
2Two detectable signals that obtain when an end of optical mask information scans the other end obtain the decoded form of an optical mask information. Under various operations angle, have at least effective a detection to have suitable size, can obtain the correct reading result of optical mask information.
For the lower bar code situation of density, shown in Fig. 2 a, big circle is surveyed spot S under 0 ° of operation angle1Can provide correct result. But, for the many printed bar code of some noise, dot matrix printed bar code for example, the detection spot S of minor diameter2In fact too littler. For slightly larger angle, for example the situation of Fig. 2 b is surveyed spot S for two1、S
2At least to a certain extent can provide the information that might read. Such two information can obtain a correct decoded result after merging. When operation angle θ increases, survey spot S1、S
2Become elongated, large diameter detection spot S is too big in most cases, and the detection spot of minor diameter becomes and has suitable diameter.
Fig. 3 illustrates and surveys spot S1、S
2The bar code of higher density is carried out the situation of transversal scanning. When the operation angle is near 0 ° or its time, survey spot S1、S
2Inevitable all is circular. On some points in high-density bar code is scanned, particularly as on two positions of centre, major diameter is surveyed spot S1Range spans two or more bar shaped key elements. In this scope, through after average, just can not obtain representing the correct information of fillet shape key element. With it in pairs than be that minor diameter is surveyed spot S2Scope little, even also only crossed over a fillet shape key element in above-mentioned position.
Fig. 4 illustrates and surveys spot S1、S
2The situation that a bar shaped key element 23 of dot matrix bar code is carried out transversal scanning. As shown in the figure, exist the gap between each point of in fact bar shaped key element 23. When surveying spot S with minor diameter2During detection, will survey point to the gap as bright area as dark areas. Consequently, with Survey spot S2The corresponding signal of detection will think that in dark zone, place, above-mentioned place be bar shaped, bright zone is the interval. Thereby, use and survey spot S2Can not correctly read the width of bar shaped key element 23 during detection. With it in pairs than be that major diameter is surveyed hot spot S1Can derive correct decoded result. Because with surveying spot S1To the reverberation in the detection spot region of broadness be averaged during detection, can express dark bar shaped.
Fig. 5 shows in the first embodiment of the invention to produce has two different resolutions, also promptly has two different the simplest methods of surveying two passages of spots.This embodiment has the Aristogrid of different resolution by use, obtains two different resolution with electronic technology.Reading device can be an autoscanner, necessary bar-shaped reading apparatus in the time of also can being manual scanning.Below, suppose that reading device is a rod-type, the circuit network of Fig. 5 is described.
It is that light emitting diode (LED) 41 and single photo-detector are photodiode (PD) 42 that the embodiment of Fig. 5 contains single light source.Optical illumination optical mask information (bar code) the 20 lip-deep zones that LED41 sends.PD42 surveys from the light of bar code 20 reflections and produces simulating signal.The amplitude of simulating signal has been represented catoptrical amplitude.Reading device scans bar code.When reading device was the rod-type device, the user moved to the other end with handle stem from an end of bar code.With bright area and the dark areas generation amplitude variations of the corresponding simulating signal of the reflected light of being surveyed according to bar shaped.
The simulating signal that obtains from PD 42 is by two analog signal conditioning circuits 43 and 44 amplifications, paraphase and adjustment.Signal adjustment circuit 43 and 44 comes down to identical, thereby has provided two analog output signals.One in these two output signals is admitted to first Aristogrid 45, and another is admitted to second Aristogrid 46.Aristogrid 45 is identical with the employed Aristogrid of single channel formula reading device in the past with 46, has edge finder, i.e. the function of shaping circuit.In each Aristogrid 45 or 46, Aristogrid institute predetermined threshold value has determined which point in the simulating signal to represent the edge of bar shaped.But, Aristogrid 45 and 46 has different threshold values.
Be admitted to the microprocessor formula demoder 47 of having programmed from the pulse signal of two Aristogrids, 45,46 outputs.Signal adjustment circuit 43 and Aristogrid 45 are carried first data stream to demoder 47, constitute first passage.Signal adjustment circuit 44 and Aristogrid 46 are carried second data stream to demoder 47, constitute second channel.As shown in Figure 6 and Figure 7, because the threshold value T of first Aristogrid 43
1Must be lower, so the resolution of Aristogrid 43 is lower.In contrast, the threshold value T of second Aristogrid 46
2Than higher, sensitivity is also than higher.
When Fig. 6 illustrates high-density bar code is scanned, the signal that is produced in Fig. 5 circuit.Because simulating signal is to change according to average reflected light, so smaller after adjusting corresponding to the variation of narrow at interval bar shaped signal.Because the threshold value of first Aristogrid 45 of first passage is low, so from the pulse signal of Aristogrid 45 outputs as shown in Figure 6, have some variations not to be detected out.Because high-resolution second channel has highly sensitive Aristogrid 46, some small embossments in its gang mould analog signal also can detect, so can detect the catoptrical little variation that the bar shaped key element by narrow interval is caused.Thereby as shown in Figure 6, the Aristogrid 46 in the high-resolution second channel can be exported and the lucky consistent spike train in bar code edge.
When Fig. 7 illustrates the dot matrix low-resolution barcode is scanned, the signal that is produced in Fig. 5 circuit.Because simulating signal is to change according to average reflected light, so contain little variation after adjusting corresponding to array point.In addition, simulating signal also contains the big variation corresponding to the bar-code marks actual feature.Because the threshold values of first Aristogrid 45 is low, so such from Aristogrid 45 resultant pulse signals shown in the image pattern 7 do not detect the little variation in the simulating signal.Thereby the Aristogrid 45 from the first passage of low resolution can be exported and the lucky consistent spike train in bar code edge.Otherwise,, can detect the small embossment in the simulating signal, so also can be detected out by the catoptrical little variation that gapped array point caused in the bar shaped key element because high-resolution second channel has highly sensitive Aristogrid 46.Thereby as shown in Figure 7, the pulse signal that obtains from Aristogrid 46 and the actual edge of bar shaped key element are inconsistent.
As can be seen from Figures 6 and 7, no matter for high resolving power bar code or low-resolution barcode, the pulse signal that in two passages one will produce and the edge that is scanned bar code is consistent is just exported, i.e. data stream.Except because having two data stream of passage of two different resolutions thereby demoder 47 has two input ends rather than the input end, this demoder is the unit of a standard of comparison.Demoder 47 after the merging is exported for example digitalized data of ASC II form.This special decoding processing will be elaborated with reference to Figure 19 and Figure 20 in the back.
Above-mentioned two data passages can in all sorts of ways and obtain.Fig. 8 and subsequent figure show several available solutions concisely.But, in each embodiment, all devices all are to transport two data stream from the passage of two different resolutions to a demoder 47.Demoder 47 all is identical.
In the embodiment of Fig. 8, two different passages form with optical means.This embodiment has two light-emitting components and two detectors.On the optical illumination bar code 20 that the one LED51 sends first surveyed spot.The light that LED 51 sends is reflected on bar code and returns, and is surveyed by a PD 52.The form that the high-resolution data that is provided by first signal adjustment circuit 53 and first Aristogrid 54 flows with the spike train signal is transported to demoder 47.On the optical illumination bar code 20 that the 2nd LED 55 sends second surveyed spot.Be reflected on the optical illumination bar code that LED 55 sends and return, survey by the 2nd PD 56.The form that the high-resolution data that is provided by the secondary signal adjustment circuit 57 and second Aristogrid 58 flows with the spike train signal outputs to demoder 47.
As shown in Figure 8, light-emitting component and detector configuration must make two detection spots separate some distances.This is called multipleization of space.If two are surveyed spot is concentric, can use other forms of multipleization.For example, can be designed to allow LED 51 and 55 send the light of different wave length, and 52,56 of PD survey the light that corresponding LED sent, and also light filter can be set.
The embodiment of Fig. 9 has used two light-emitting components and a detector.In order to form two passages, make the output of detector synchronous with the modulation of two light-emitting components respectively, to realize multipleization.In order to obtain two different effective detection spots and two different resolution.Two light-emitting components with (or) corresponding optical devices are different.Surveying spots for two can be just in time arranged side by side by a straight line, also can be on the surface of bar code 20 near being concentric.To the modulation of two LED, realized that the time of high resolving power and low-resolution signal is cut apart multipleization by respectively.
The 3rd embodiment contains two LED 61, LED 62 and a PD 63.Switch 64 makes LED 61 and 62 alternations.In addition, switch 65 is given two samplings the output of PD 63 and is kept in (S/H) circuit 66,67 one.Signal adjustment circuit 68 and Aristogrid 70 flow to demoder 47 to the pulse signal of low resolution channel.In addition, signal adjustment circuit 69 and Aristogrid 71 flow to demoder 47 to the pulse signal of high resolution channel.Clock 72 flows to switch 64,65 and S/ H circuit 66,67 to suitable timing signal.Also have,, carry out demodulation according to frequency then, also can realize multipleization by two LED being done modulation fast with two different frequencies.
Then, signal adjustment circuit and Aristogrid are to the data stream of two different resolutions of demoder 47 conveyings.Signal circuit 68,69 is fully corresponding with signal adjustment circuit and Aristogrid in the previous embodiment with Aristogrid 70,71.
Figure 10 to Figure 14 illustrates the preferred embodiment of the optical devices in the modified form reading device (having bar type structure).To shown in Figure 14, the optical devices of binary channels bar-shaped reading apparatus can be made three unconventional optical systems that constituted by in conjunction with two semi-arched awls as Figure 10.In this design, used two LED and a detector, identical with embodiment of circuit shown in Figure 9, two LED are alternations.
The optical devices of Figure 10 to Figure 14, promptly the optical profile type sniffer contains a LED 61 and the 2nd LED 62.These two light-emitting components are configured within the shell of device, and luminous along first and second optical axises respectively.That is to say that as shown in figure 10, LED 61 is along axis 1 ' send light, LED 62 is along axis 2 ' send light.Optical detection device PD 63 surveys the light that is sent and reflected by bar code by two LED 61,62.PD 63 is configured in the socket 79, and accepting along the central shaft of optical profile type sniffer is the reflected light of axis 3.Axis 3 and first and second optical axises (be axis 1 ' and axis 2 ') parallel.The optical profile type sniffer also contains injecting forming plastic optical element 77.Optical element 77 is made up of the one the second semi-archeds awl, and they are bored 2 with arch awl 1 and arch respectively and represent in Figure 10.Arch awl 1 is along axis 1 ' arrange in line with LED 61, arch awl 2 along axis 2 ' with LED 62 arrangements in line.
First semi-arched awl optical element, promptly the arch awl 1, sends light and PD 63 at LED 61 and accepts the light time and determined the scenery degree of depth and surveyed the spot size.Equally, arch awl 2 sends light and PD 63 at LED 62 and accepts the light time and determined the scenery degree of depth and surveyed the spot size.But, two semi-arched awls also can replace with other elements, and having needed only them can determine the different scenery degree of depth and survey the spot size as two semi-archeds awls, provides two kinds of different resolution of two passages.
The rear surface of each semi-arched awl all is a sphere, and it is the arch cone angle that arch has appointment that front surface is made.The curvature that arch is bored 1 rear surface SA1 makes its focus at F1 place (Figure 14).The curvature that arch is bored 2 rear surface SA2 makes its focus at F2 place (Figure 14).LED 61 and LED 62 are configured in above-mentioned focal point F 1 and F2 place respectively.
As shown in figure 10, the arch angle of each semi-arched awl is defined as the angle between the perpendicular line of three axles of arch awl front surface and optical system.In order to provide the different scenery degree of depth and to survey the spot size, the different (α of arch cone angle of arch awl 1 and arch awl 2
1≠ α
2).The diverging light that LED 61 and 62 sends is become directional light by arch awl 1 and 2 refractions of arch awl, and is poly-then to bar code (Figure 14).
Also have, the socket 79 that stretches out to PD 63 the place aheads from housing back wall is configured in the shell 75.79 pairs of catoptrical detections of bar code of socket do not hinder, but have the effect of the light directive PD 63 that prevents the LED 61,62 that reflected by rear surface SA1 and SA2.Socket 79 is concentric (Figure 12) with axis 3.In addition, in order to allow the lead-in wire of LED 61,62 and PD 63 pass, a little holes (Figure 13) on the rear wall of shell 75, have been offered.
In binary channels rod-type read head, also can replace, shown in Figure 21,22, wherein use two LED 51 and 55 and two photo- detectors 52 and 56 with lens arra.In this case, optical profile type sniffer shown in Figure 21 uses the circuit network among Fig. 8.The light that sends from two LED 51,55 is by two non-spherical lens L
1And L
2Poly-to same target.From the light of target reflection by lens L
3, L
4Converge on the photo- detector 52,56, convert analog electrical signal to.Lens L
1And L
2Difference be their spherical aberration difference.Spherical aberration is used for controlling the illumination zone on light intensity, the scenery degree of depth and surface.
As shown in figure 23, spherical aberration is a kind of focal length with the different and different aberration of the height of incident ray.F is the focus of paraxial rays, F
mIt is the intersection point of marginal ray and optical axis.Distance between these two points is longitudinal spherical aberration L.SA.This spherical aberration has the effect that increases the scenery degree of depth.Picture will be big along horizontal change.The radius of this picture is called spherical lateral aberration T.SA, is expressed from the next.
T.SA＝L.SA×t
anU
Lens L
1The L.SA of 2mm and the T.SA of 5 mils are arranged approximately, lens L
2The L.SA of 2mm and the T.SA of 20 mils are arranged approximately.Thereby, owing to the U angle difference of two lens that obtain by following formula, so the clear aperture radius of two lens is also different.
Figure 15 has two photosensitive areas
#1 He
#The planimetric sketch of 2 photo-detector.As shown in the figure, the central, circular photosensitive area of representing by cross hatch
#Surround the photosensitive area of representing by oblique line around 1
#2.The structure of the photo-detector of this embodiment will describe with reference to Figure 17 and Figure 18 in the back.The distinguishing feature of this photo-detector is that it comes down to multichannel sniffer.This multichannel light detector contains first photosensitive area and second photosensitive area that is made on the same substrate.Second photosensitive area be configured in first photosensitive area around.Two photosensitive areas substrate below them have respectively constituted two photodiodes.This photo-detector uses in the embodiment of the invention shown in Figure 16.
In the circuit of Figure 16, signal adjustment circuit and Aristogrid among the embodiment of signal adjustment circuit and Aristogrid and Fig. 8 and Fig. 9 have identical functions.Unique difference is that first Aristogrid in the lower channel of second Aristogrid in the upper channel shown in Figure 16 all is high-resolution.
A light-emitting component and two photo-detectors are arranged among this embodiment, and photo-detector is made of the photosensitive detecting area of device shown in Figure 15.In Figure 16, D1 represents to have the photosensitive area
#1(central authorities photosensitive area) photo-detector, D2 represents to have the photosensitive area
#Photosensitive area around the 2() photo-detector.LED 131 sends the light of light optics encoding information.Photo-detector D1, D2 accept the light from bar code 20 surface reflections.
Photo-detector D1 produces representative from fact less central photosensitive area
#The simulating signal of the mean value of the light of 1 entire area internal reflection.This signal and when using the photodiode of little effective search coverage resulting signal identical, this effective search coverage determined to visit spot size then and (or) resolution of high resolution channel.
Photo-detector D2 produces representative from fact bigger photosensitive area on every side
#The simulating signal of the mean value of the light of 2 entire area internal reflection.From the simulating signal of D1 and D2 by totalizer 132 additions.The composite signal of this simulating signal is in close proximity to from bigger photodiode (promptly regional
#1 and regional
#2 altogether whole photosensitive areas) signal of the mean value of the light of reflection.
The composite signal that signal adjustment circuit 133 is accepted from totalizer 132 carries out aforesaid adjustment.By 134 digitizings of first Aristogrid, provide the data stream of low resolution from the signal of signal adjustment circuit 133 output.Like this, detector D1, D2, totalizer 132, signal adjustment circuit 133 and first Aristogrid 134 have constituted the first passage of low resolution of the present invention.On the other hand, the signal that signal adjustment circuit 137 is accepted from D1 carries out aforesaid adjustment.By 138 digitizings of second Aristogrid, provide high-resolution data stream from the signal of signal adjustment circuit 137 output.Like this, detector D1, signal adjustment circuit 137 and second Aristogrid 138 have constituted high-resolution second channel of the present invention.The pulse signal that demoder 47 is accepted from Aristogrid 134,138 carries out the identical processing of embodiment that has illustrated with the front.
With Figure 10 device similar to optical profile type sniffer shown in Figure 14 in, preferably use the photo-detector of Figure 15.At this moment, the photo-detector of Figure 15 has substituted the PD 63 in the optical profile type sniffer, and because each on the photo-detector is regional only corresponding to a light source, so LED61 in the optical profile type sniffer and LED62 are lighted simultaneously.In addition, arch awl 1 has identical arch angle (α with arch awl 2
1=α
2).So, the size of photosensitive area determined two passages resolution with survey the spot size.
Utilize additional peripheral region, corresponding totalizer, signal adjustment circuit and Aristogrid, the passage that increases the resulting different resolution of photo-detector of using Figure 15 is just very simple.Also can replace and use two photosensitive regions, and image pattern 9 is such, and two LED in the optical profile type sniffer are modulated.
The photo-detector of Figure 15 is to make of the photodiode manufacturing technology of standard of comparison.In detail, its manufacture craft is similar to the manufacture craft of parallel type photodiode or four-quadrant photodiode cell.Non-photosensitivity district between the photosensitive unit is that the size in dead band is generally 0.001～0.005.Can be for layout such as Figure 17 and shown in Figure 180 of Figure 15 photo-detector of considering.
In first embodiment of Figure 17, at substrate 141 make two photosensitive areas.First photosensitive area 142 is circular.First photosensitive area 142 is to make by border circular areas being done suitable doping.Around this photosensitive area 142 is dead band 143.Second photosensitive area 144 has the shape that is essentially annulus that is centered around around first photosensitive area 142 and the dead band 143.Second photosensitive area 144 is to make by annulus being done suitable doping.Dead band 143 makes 142,144 separation of two photosensitive areas and electrical isolation is arranged.Public lead-in wire 148 is fixed on the substrate 141 by welded gasket 147.Like this, each photosensitive area 142,144 all the substrate below it constitute photodiode jointly.
Figure 17 shows the preferred mode of connection for first photosensitive area 142.In this embodiment, does not make second photosensitive area 144 is the complete circle of surrounding first photosensitive area 142, but leaves a narrow non-photosensitivity district 149, forms the insulated paths of transversely cutting second photosensitive area 144 annulus.The metal wire of making in narrow non-photosensitivity district 149 145 is connected with first photosensitive area 142 by welded gasket.Like this, just can be by welded gasket and metal wire 145 to the first photosensitive area supplying electric current.Equally, tinsel 146 is connected with second photosensitive area by welded gasket.Because be provided with non-photosensitivity district 149 and a part will be lost in metal wire 145, the second photosensitive areas 144, this a part of width is little, is no more than 2 mils.
Figure 18 shows second embodiment of photo-detector, and it has the photosensitive area of two rectangles, directly is provided with welded gasket on each photosensitive area.In this embodiment, two photosensitive areas on substrate 151, have been made.First photosensitive area 152 is rectangles.First photosensitive area 152 is to make by suitable doping is carried out in the rectangular area.Around this first photosensitive area 152, arranged the dead band 153 of rectangle.Second photosensitive area 154 of rectangle has surrounded first photosensitive area 152 and dead band 153 fully.Second photosensitive area 154 is to carry out suitable doping by the straight-flanked ring to the outer ring to make.Dead band 153 makes photosensitive area 152 separate with photosensitive area 154 and electrical isolation is arranged.Public lead-in wire 158 is fixed on the substrate by welded gasket 157.Each photosensitive area 152,154 has all constituted photodiode jointly with the substrate above it.
Figure 18 illustrates second kind of connected mode to the photosensitive area.In this embodiment, welded gasket is set directly at respectively on each photosensitive area.Metal lead wire 155 by welded gasket to first photosensitive area, 152 supplying electric currents.Equally, second metal lead wire 156 by welded gasket to second photosensitive area, 154 supplying electric currents.In each photosensitive area, need sacrifice a part of photosensitive region in order to form welded gasket.In addition, as shown in figure 18, metal lead wire 155 also will produce shadow on second photosensitive area 154.
Mainly illustrated above about on substrate, form the such preferred embodiment in photosensitive area as Figure 15 to modified form detector shown in Figure 180, yet use photo-detector also to be fine with other types photosensitive area.For example, can consider by the photo-detector that the zone constituted in two-dimensional charge coupled apparatus (CCD) array.In this case, can be with the square inferior array of a plurality of photosensitive pixels in the ccd array (for example 2 * 2)) constitute central photosensitive area.Photosensitive area around can constituting with a plurality of photosensitive pixels around the central photosensitive area (for example, two Q-RINGs that pixel is wide around the square central photosensitive area).The signal of central authorities' photosensitive area output can obtain like this: the displacement of the charge value of each pixel in 2 * 2 square inferior arrays is read, and the pixel count of central photosensitive area is done the average of charge value.The output signal of photosensitive area also obtains with same method on every side.Perhaps, also can the charge value relevant for two zones be averaged together, directly make composite signal.
Figure 19 is expression demoder 47 process flow diagram that is correctly decoded result's process of data stream acquisition according to two different resolutions.In first step ST1, demoder 47 reads the data from two passages simultaneously.Below, the data from two passages are called data A and data B.A data stream that is equivalent to low resolution during two data are imported, another is equivalent to high-resolution data stream.At step ST2, demoder is done decoding to data A and is soundd out.In step ST3, whether demoder is judged the decoding exploration of data A successful.If success, then program enters step ST8, sends the successful buzzer of sign scanning, follow in step ST9, the data behind the output decoder, and in step ST10 termination routine.Yet, if in step ST3, be judged as the decoding of data A sound out unsuccessful, at step ST4 demoder to the data B exploration of decoding.Judge in step ST5 then whether successful demoder is soundd out to the decoding of data B.If success, program enters step ST8 again, after making the successful sign of scanning, and the data in step ST9 behind the output decoder, termination routine in step ST10.Yet if the decoding exploration that is judged as in step ST5 data B gets nowhere, demoder is carried out the algorithm that scanning merges in step ST6.
Below with reference to Figure 20 the scanning merge algorithm is described.As shown in the figure, first passage has produced the pulse signal that contains place's mistake from its Aristogrid.Yet,, can disclose which partial data is within the permissible range in the signal according to specific bar code specification.Equally, second channel has produced the pulse signal that contains place's mistake from its Aristogrid, and discloses which partial data is within the permissible range in the signal.The position that is contained in the mistake in the first passage data is different with the position of mistake in being contained in the second channel data.Those parts that microprocessor decoder picks out two channel datas are within the tolerance parameter scope.Microprocessor decoder abandons the misdata of two passages, in conjunction with the part of allowing of two channel datas, provides a correct result's (revised signal of Figure 20) that reads at last.Like this, even two upper channels have all produced the data that can not directly decode, microprocessor decoder also can provide a correct result by merging the data from two passages.
The scanning merge algorithm is similar for the disclosed processing of U.S. Patent application of " with the method and apparatus that repeatedly scans bar code decoding " to denomination of invention.Above-mentioned U.S. Patent application has been described by analysis scan signal correct judgment data, by repeatedly scanning the data decoding, merging.Though the application's scanning merge algorithm is that similarly it is applicable to scan-data passage, that simultaneously accepted of processing from two different resolutions.
Get back to Figure 19, carried out in step ST6 after the scanning merge algorithm, demoder judges whether scanning merges successful.If success, program enters step ST8 again, sends the successful sign of scanning, then the data behind the output decoder, termination routine in step ST10 at last in step ST9.Just in case scanning still can not obtain correct decoded result after merging, program just can not be exported correct decoded data so, finishes in ST10.
To illustrate by to handling from the data of two passages in order concentrating, to have been oversimplified with localization about the explanation of software above to obtain decoded result.Demoder can also be equipped with appropriate software, so that might carry out from identification other different code marks, detects actual code data from containing representative from the analog scan signal of the pulse of the light of other target reflections.
In addition, microprocessor decoder can also be to programming relevant for the action of integrated terminal device.End device generally can be equipped with storer, keyboard, the display of suitable capacity and certain data-interface that is used to communicate by letter.In such integrated terminal device, microprocessor is being controlled to the response of the keyboard of data and instruction input, to scan-data with key in the demonstration of data and to the data transmission of external data processing device.
Basic two-channel system of the present invention has been described above.Increasing the data channel with different resolution again is the expansion of the foregoing description, still belongs to category of the present invention.
Claims (6)
1, a kind of method that enlarges the operation angular region of bar-shaped reading apparatus when reading optical mask information is characterized in that it may further comprise the steps:
(a) in order (i) to carry out optical detection to the light that reflects from first effective detection spot with first diameter, and (ii) to carrying out optical detection from second light of effectively surveying the spot reflection with second diameter bigger than first diameter, and the step of light-emitting component and detecting element is set in bar
(b) first and second effective spots of surveying are swept to opposite side from a side of optical mask information, thereby (i) detect first effectively survey spot when inswept optical mask information and produce the first corresponding with it detectable signal, and (ii) detect second effectively survey spot when inswept optical mask information and produce the step of the second corresponding with it detectable signal, and
(c) according to above-mentioned two detectable signals, derive the step of a decoded form of optical mask information, and along with the increase at operation angle, first and second diameters of effectively surveying spot also increase pari passu, and under various operations angle, have at least a size of effectively surveying spot to be suitable for correctly reading optical mask information.
2, a kind of bar-shaped reading apparatus that can read optical mask information under wide operation angular region is characterized in that it is equipped with:
(a) (ⅰ) be arranged in the bar can be to carrying out optical detection from first light of effectively surveying the spot reflection with first diameter, can first effectively survey spot detect optical mask information when inswept and produce the first corresponding detectable signal,
(ⅱ) be arranged in the bar can be to carry out optical detection from second light of effectively surveying the spot reflection with second diameter bigger than first diameter, can when second effective detection spot is inswept, detect the light-emitting component and the detecting element of the second corresponding detectable signal of optical mask information and generation, and
(b) device of deriving a decoded form of optical mask information according to above-mentioned two detectable signals, increase along with the operation angle, above-mentioned first and second diameters of effectively surveying spot also increase pari passu, and under various operations angle, have at least a size of effectively surveying spot to be suitable for correctly reading optical mask information.
3, a kind of method that reads optical mask information is characterized in that it may further comprise the steps:
The step that optical mask information is thrown light on,
Detection produces the step that optical mask information is had two data stream of different resolution from the light of optical mask information reflection, and
Go out the step of a decoded form of optics encoding information according to two data conductances that different resolution is arranged.
4, a kind of device that reads optical mask information is characterized in that it is equipped with:
Can carry out optical detection to optical mask information, and produce at least one sniffer thus corresponding to the electric signal of optical mask information,
As response to above-mentioned at least one electric signal, can be each scanning of being undertaken by above-mentioned sniffer the device that leads respectively and go in two data passages in each path, above-mentioned two data passages have different resolution respectively, the resolution of a passage is than the resolution height of another passage, and
As response, can produce the demoder of a data output representing optical mask information to two data passages being imported into.
5, a kind of optical profile type sniffer, it comprises:
Along first light-emitting component of primary optic axis output light,
Along second light-emitting component of second optical axis output light that parallels with above-mentioned primary optic axis,
Accept and survey send from first and second light-emitting components, and along the optical detection device of the light of the 3rd optical axis reflection that parallels with first and second optical axis,
Along primary optic axis and with first light-emitting component arrange in a straight line, be received from the light time decision scenery degree of depth that first light-emitting component sends and effective first semi-arched awl optical element of spot size at optical detection device, and
Along above-mentioned second optical axis and with second light-emitting component arrange in a straight line, that have an optical property that is different from first semi-arched awl optical element at least, be received from the light time decision scenery degree of depth that second light-emitting component sends and effective second semi-arched awl optical element of spot size (be different from optical detection device and be received from the scenery degree of depth of the light time that first light-emitting component sends and effective spot size) at optical detection device.
6, a kind of multichannel light detector, it comprises:
Be formed on the first photosensitive detecting area on the substrate, and
Be formed on the aforesaid substrate, the second photosensitive detecting area around the above-mentioned first photosensitive detecting area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92113728 CN1032279C (en) | 1992-12-19 | 1992-12-19 | Bar-shaped reading apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92113728 CN1032279C (en) | 1992-12-19 | 1992-12-19 | Bar-shaped reading apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1088702A true CN1088702A (en) | 1994-06-29 |
| CN1032279C CN1032279C (en) | 1996-07-10 |
Family
ID=4946579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92113728 Expired - Fee Related CN1032279C (en) | 1992-12-19 | 1992-12-19 | Bar-shaped reading apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1032279C (en) |
-
1992
- 1992-12-19 CN CN 92113728 patent/CN1032279C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1032279C (en) | 1996-07-10 |
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