CN2727687Y - Electronic tape measure - Google Patents
Electronic tape measure Download PDFInfo
- Publication number
- CN2727687Y CN2727687Y CN 200420093083 CN200420093083U CN2727687Y CN 2727687 Y CN2727687 Y CN 2727687Y CN 200420093083 CN200420093083 CN 200420093083 CN 200420093083 U CN200420093083 U CN 200420093083U CN 2727687 Y CN2727687 Y CN 2727687Y
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- China
- Prior art keywords
- tape measure
- ruler
- measurement
- row
- aperture
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses an electronic tape measure, belonging to the field of the length measurement. The present traditional tape gets the length value by the scale in the tape measure; the measurement which is done by the visual judging can easily cause operation error, with a low accuracy. The utility model based on the traditional tape measure adopts the multirow small holes uniformly distributed to replace the scale, and adopts the technical project of the connection of a photoelectric translating circuit and a single chip computer, displaying the measuring result on the liquid crystal display. The measuring result has the advantages of high accuracy and reliability. Besides, a single man can complete the measurement task due to the small length of the tape measure.
Description
Technical field
The utility model relates to the measuring equipment field, especially the linear measure longimetry field.
Background technology
When the length of measurement space distance, all use traditional tape measure, obtain length numerical value by the scale on the ruler.If length measured surpasses the length of ruler, just need each result who measures be added up through repeatedly measuring, obtain measurement result.This measurement is to be undertaken by visual determination, and by manually carrying out, these operations are easy to cause error, influence measuring accuracy widely to the cumulative calculation repeatedly measured, and accuracy can only reach 1mm.Measure long apart from the time, one man operation is difficult to finish, and often needs two people to cooperate, and has increased labor capacity, in order to improve the measuring accuracy and the amount of lightening one's labor, must traditional tape measure be improved.
Summary of the invention
The purpose of this utility model is for providing a kind of measuring accuracy height, Electronic tape measure easy to use.
The technical scheme that realizes this purpose is for having a housing, the ruler of crispaturaing is housed in housing, having ruler on housing imports and exports, control knob also is housed on the housing, length direction at ruler is equipped with many row's apertures abreast, aperture evenly distributes, the aperture is 0.1-100mm, pitch-row is 0.1-100mm, be that aperture position staggers equably on the Width between row and row, positive and negative both sides at ruler are equipped with luminotron and light receiving tube respectively, and luminotron is connected with photoelectric switching circuit with light receiving tube.Photoelectric switching circuit is connected with single-chip microcomputer, and single-chip microcomputer also is connected with electrify restoration circuit, keyboard switch circuit, testing circuit and display circuit respectively.
In Electronic tape measure when work,, ruler moves between luminotron and light receiving tube, light or pass the aperture on the ruler or blocked by ruler, and the light signal of interruption is delivered to single-chip microcomputer, by the single-chip microcomputer record.When ruler drew back, whenever by an aperture, single-chip microcomputer write down once light, and carries out additive operation, and the result who adds up just equals the length that ruler is pulled out; When ruler shortened, whenever by an aperture, single-chip microcomputer write down once light, and carries out subtraction, and the tired result who subtracts just equals the length of ruler indentation.Like this, three kinds of selection modes are arranged during measurement, only need operation one knob down, change the control program of single-chip microcomputer, just can change metering system.
Three kinds of metering systems are:
1, only measurement spaces out;
2, only measure contract by distance;
3, draw back contraction and all measure, both absolute values of difference are exactly actual measured results.
If length measured is no more than the length of ruler, more convenient with first kind of metering system, as long as ruler is drawn back suitable length, press the confirming button on the tape measure then, the length measured value just is presented on the LCD regularly, drawing back or indentation of tape measure is not influence measurement, up to pressing confirming button once more at this moment.
If length measured surpasses the length of ruler, will be by repeatedly measuring.Electronic tape measure is only measured the distance of drawing back, need only ruler by staying on any of measurement, then housing is drawn back, measure the distance of being drawn back, fixedly tape measure, allow ruler shrink automatically, the distance of its contraction does not add up, and then draws back, and measures the distance of being drawn back ... finish up to measurement, tape measure is all regained.Owing to do not need to align again, this method is measured simpler.And in this way, distance no matter how long, whole measurement result need not be pressed any button without any need for calculating.
Measuring accuracy of the present utility model depends mainly on the pitch-row of aperture on the ruler and row's number of aperture.As 5 apertures are arranged on the length of 10mm, pitch of holes is 2mm, if having only a round, the precision of Ce Lianging is exactly 2mm so.Among Fig. 4, at the Width of ruler, 4 row's apertures are arranged, every row has 2 pick-up units, has 8 pick-up units.So the precision of measurement is 2mm/ (4 * 2)=0.25mm, such precision is than common steel tape height.Owing on ruler, punch, certain technical difficulty is arranged, the diameter in hole can not be too little, so increase precision, can consider to increase the quantity of pick-up unit, as every row 8 pick-up units are arranged, have 32 pick-up units, then the precision of its measurement is 2mm/ (4 * 8)=0.0625mm.In fact, for Electronic tape measure, too high precision is otiose.
The utlity model has following characteristics:
(1) measuring accuracy height, ordinary steel tape measure precision is 1mm, the fundamental measurement precision of Electronic tape measure is 0.25mm, is 4 times of ordinary steel tape measure, can reach higher according to the precision of different needs Electronic tape measures.
(2) ruler length is shorter, and physical length can be controlled in the distance that ordinary people's both hands are stretched out, and promptly between the 1-2 rice, so one man operation can easily finish measuring task, but also saved starting material, reduced cost.
(3) reliability height, distance to middle process when Electronic tape measure is measured is insensitive, if there is part chi hole to be blocked, be clearly as long as have a hole at least in each start mark of measuring and final last 4 holes of the clear or every row of mark, just can not influence the measurement of ruler.
Description of drawings
Figure one is the utility model Electronic tape measure measurement mechanism structural representation
Figure two is a single-chip microcomputer P89V51RD2 pin figure
Figure three is electrify restoration circuit figure
Figure four is the keyboard switch wiring diagram
Figure five is testing circuit figure
Figure six is provided with position view for pick-up unit
Figure seven is single-chip microcomputer and VLCM320240 interface circuit figure
Embodiment
Fig. 1 has shown that being equipped with four on ruler 1 arranges equally distributed microstome, side at ruler is equipped with light emitting diode, light is mapped on photosensitive triode that is in the ruler opposite side by aperture, along with the mobile light of ruler passes aperture one by one, cause alternately bright, photosensitive three pipes transfer light signal to electric signal, are connected with single-chip microcomputer.
Single-chip microcomputer selects P89V51RD2, is a 80C51 micro controller, includes the data RAM of 64KBFlash and 1024 bytes, and Fig. 2 has shown pin figure.
Fig. 3 has shown electrify restoration circuit, after initially powering on, the port pin may be any state, stablizing starting of oscillation and internal reset logic up to oscillator draws high all pins are faint, high level on the RST pin of device energising back is except the electrification reset of will remaining valid 2 required machine cycles, oscillator also will keep a period of time, so that can be stablized starting of oscillation.The back P89V51RD2 that resets will enter the SoftICE pattern, or attempt automatically performing the ISP Boot loader, operate in success yet behind the 400ms if this automatically performs, and device just begins to carry out personal code work.
Fig. 4 has shown the keyboard circuit that contains 8 buttons, and 8 buttons are received respectively after pull-up resistor is drawn high on P1 mouth 8 rule I/O lines of CPU (P1.0-P1.7).Under the situation that no key is pressed, input is high level on the P1.0-P1.7 line.When key is pressed, the I/O line that links to each other with button will obtain the low level input, still keep the high level input on the incoming line of other buttons.As seen from the figure, 8 I/O lines of P1 mouth through with behind the door, signal is passed to
INTOOn the pin (P3.2).Like this, when having key to press,
INTOTo have a negative edge to produce on the pin, application is interrupted.In interrupt service routine, at first delay time about 20ms, wait for that key jitter inquired about each key in the past again, find institute's button, and forward in the corresponding handling procedure and go.
Fig. 5 has shown that testing circuit constitutes situation, and when light emitting diode shone photosensitive triode by the hole on the tape measure, the electric current that photosensitive triode is passed through strengthened, and makes Schmidt trigger CD4093 be output as high level.When tape measure moves when light hole is covered, CD4093 is output low level just.Tape measure constantly moves, and CD4093 is output pulse sequence just.Measure pulse number, just know the hole count that tape measure moves through, thus the distance of calculating.In order to reduce interference, to wrap photosensitive triode is whole, head only exposes a slight light hole.Equally, wrap light emitting diode is whole, head only exposes a slight light hole.Have only when the light hole of light emitting diode and the light hole of photosensitive triode are overlapped fully, the electric current that photosensitive triode passes through just can strengthen, and CD4093 just can export a rising edge.Like this, can guarantee to have only a rising edge per quarter.The P2.0-P2.7 pin of single-chip microcomputer P2 mouth is received in 8 Schmidt trigger outputs.
Fig. 6 has shown that pick-up unit is provided with situation, illustrates among the figure: aperture 1mm, and pitch-row 2mm, vertical line 1～8 eight line faces between two lines mutually at a distance of 0.25mm.Horizontal line has A, B, four lines of C, D, and every line is approximately 20mm/ (4+1)=4mm at interval.(ruler thickness is approximately 20mm).Under the normal condition, no matter ruler is by right past moving left, and still moves from left to right, and it measures the minimum length of differentiating can both reach 0.25mm.One has 8 pick-up units, owing to have only 4 rounds, then every round has 2 pick-up units.
The setting of table 1 pick-up unit
| Perpendicular 1 line | Perpendicular 2 lines | Perpendicular 3 lines | Perpendicular 4 lines | Perpendicular 5 lines | Perpendicular 7 lines | Perpendicular 6 lines | Perpendicular 8 lines | |
| Lateral separation | +0.00 | +6.00 | +12.00 | ?+18.00 | ?+24.00 | ?+30.00 | ?+36.00 | ?+42.00 |
| Horizontal A line | PA0 | ?PA4 | ||||||
| Horizontal B line | PA1 | ?PA5 | ||||||
| Horizontal C line | PA2 | ?PA6 | ||||||
| Horizontal D line | ?PA3 | ?PA7 | ||||||
| From right to left | 0 | 0.25 | 0.50 | ?0.75 | ?1.00 | ?1.25 | ?1.50 | ?1.75 |
| From left to right | 1.00 | 0.75 | 0.50 | ?0.25 | ?0.00 | ?1.75 | ?1.50 | ?1.25 |
Table 1 explanation: owing to the volume reason, if all put together, 0.25mm then is difficult to place at interval, also produces mutually easily and disturbs.Therefore, I adopt respectively and arrange.Way is that every vertical line lateral separation adds 6.00mm.The result is that any two pick-up unit spacings are greater than 6mm.Because the transverse holes of tape measure is apart from being evenly distributed, and 6.00mm is the integral multiple of transverse holes apart from 2.00mm, so can ignore lateral separation 6.00mm fully when considering a problem.Like this, can reduce interference effectively, reduce cost.
Its measuring method is such:
1, detects the value of PA0-PA7.They can not all be 0, can not all be 1 also.Testing result is preserved.
2, detect the value of PA0-PA7.With testing result comparison last time.If have arbitrary position to change to 1, then preserve this testing result by 0; Identical ignoring; If have only one to change to 0 by 1, cover numerical value last time, continue to detect.
3, certain, in the actual measurement process, very possible PA0-PA7 not only one be 1.So, remove unnecessary 1.Owing to have only one rising edge (promptly changing to 1 by 0) is arranged a moment in office, adopt the rising edge computing method.That is 1 to have only rising edge, and other all 1 all are 0.From the 2nd testing result, having only 1 bit value is 1.
4,, continue to detect by top method.
If 5 every 1 variations are PA0 in proper order, PA1, PA2, PA3, PA4, PA5, PA6, PA7 judges that then ruler is mobile from right to left; If every 1 variation is PA4 in proper order, PA3, PA2, PA1, PA0, PA7, PA6, PA5 judges that then ruler is mobile from left to right; If be not, then report to the police.
6 if ruler is mobile from left to right, with PA0 and PA4, PA1 and PA3, PA5 and PA7 exchange.After the exchange, count, starting point is navigated to PA0 since the 2nd measurement result; The distance that calculating had been moved before starting point.Computing method are: if the 2nd measurement result is PA7=1, then add 0.50mm; PA6=1 adds 0.75mm ... (seeing Table 2)
7, because the part hole might be stopped up, therefore plugging hole to be foreclosed: PA0-PA7 is looked do row, calculate the number of times of this row process.Computing method are: after a last circulation, if PA0, PA1, PA2, PA3, PA4, PA5, PA6 has 1 to be 1 among the PA7, add 1 with regard to looking the number of times of doing process, enters next circulation.
If 8 when measuring end, is 1 as the PA1 value, then net result adds 0.25mm ... (seeing Table 2)
Illustrate: do not stop up with the hole that is positioned at terminating point if be positioned at the hole of starting point, and the obstruction simultaneously of each row, then do not influence its net result.
Table 2 difference
| PA0 | ?PA1 | ?PA2 | ?PA3 | ?PA4 | ?PA5 | ?PA6 | ?PA7 | |
| Initial difference (mm) | +0.00 | +2.00 | +1.75 | +1.50 | +1.25 | +1.00 | +0.75 | +0.50 |
| Stop difference (mm) | +0.00 | +0.25 | +0.50 | +0.75 | +1.00 | +1.25 | +1.50 | +1.75 |
Fig. 7 has shown the situation of display circuit, the interface circuit of single-chip microcomputer and VLCM320240, VLCM320240 is a visual programming graphical interfaces that has, and adopts Serial Control, includes GB2312 simplified form of Chinese Character character library and 64KB from the liquid crystal image display module of making picture library.The negative apparent EW32F10BCW of blue film of this module employing Taiwan EDT company has 320 * 240 dot matrix resolution and CCFT backlight.When concrete the use, can control two byte GB or the ascii character code that the demonstration Chinese character of VLCM320240 or the parameter in the ascii character display command are shown Chinese character by the user command of host computer.The RXD end of P89V51RD2 links to each other with the BUSY end of VLCM320240 RS232 communication port, and single-chip microcomputer TXD end is linked to each other with module RX end, for guaranteeing the accuracy of baud rate, the crystal oscillator of P89V51RD2 should be chosen for 11.0592MHz.
Present embodiment has following characteristics:
1, plurality of specifications is arranged, export on the left side as the ruler that is fit to left hand people use, the ruler outlet that is fit to right hand people use is on the right side.
2, in the amount, promptly can measure 2 internal diameter, also can measure 2 external diameter.As long as select different metering systems, the thickness of the automatic plus-minus of Electronic tape measure meeting ruler itself.
3, sub-tape measure can be preserved the historical record of measurement, can show the time of measurement and the distance of measurement.Page turning inquiry up and down.
4, correction error: when dispatching from the factory, the error of its ruler itself is negligible, but because a variety of causes may some little deviation.At this moment, can enter the calibration function that Electronic tape measure itself has: the distance that measurement standard is 1 meter if show it is not 1 meter, can click " " correction " key, at this moment, Electronic tape measure can upgrade correction coefficient.Under the default situations, correction coefficient is 1.Electronic tape measure can multiply by this correction coefficient automatically, reaches the function of correction error.
5, unit conversion: Electronic tape measure can show multiple unit, as very little, chi, rice, inch, foot, chi, zhang, centimetre, decimeter, millimeter, yard, micron etc.Even, 2 meters, 10 meters etc.
6, ruler can be changed arbitrarily.
Claims (2)
1, Electronic tape measure, has the physical construction part, comprise housing, the ruler of crispaturaing is housed in housing, having ruler on housing imports and exports, control knob also is housed on the housing, the length direction that it is characterized by at ruler has many row's apertures abreast, aperture evenly distributes, and is that aperture position staggers equably on the Width between row and row, in the positive and negative both sides of ruler luminotron and light receiving tube is housed respectively, luminotron is connected with single-chip microcomputer by photoelectric switching circuit with light receiving tube, single-chip microcomputer also respectively with electrify restoration circuit, keyboard switch circuit, testing circuit is connected with display circuit.
2, Electronic tape measure according to claim 1, the aperture that it is characterized by described aperture is 0.1-100mm, pitch-row is 0.1-100mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420093083 CN2727687Y (en) | 2004-09-07 | 2004-09-07 | Electronic tape measure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420093083 CN2727687Y (en) | 2004-09-07 | 2004-09-07 | Electronic tape measure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2727687Y true CN2727687Y (en) | 2005-09-21 |
Family
ID=35043700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420093083 Expired - Fee Related CN2727687Y (en) | 2004-09-07 | 2004-09-07 | Electronic tape measure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2727687Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014057384A1 (en) * | 2012-10-12 | 2014-04-17 | E Measuring Device Limited | Garment measurement and reporting system |
| CN104700250A (en) * | 2015-03-16 | 2015-06-10 | 河海大学常州校区 | Intelligent volume measuring device and weighing and volume measuring integrated system |
| CN104776773A (en) * | 2015-03-13 | 2015-07-15 | 东莞捷荣技术股份有限公司 | Electronic flexible rule capable of displaying variable quantity and measurement method thereof |
| CN107677170A (en) * | 2017-10-25 | 2018-02-09 | 泸县玉流机械制造有限责任公司 | Digital tape measure |
-
2004
- 2004-09-07 CN CN 200420093083 patent/CN2727687Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014057384A1 (en) * | 2012-10-12 | 2014-04-17 | E Measuring Device Limited | Garment measurement and reporting system |
| CN104776773A (en) * | 2015-03-13 | 2015-07-15 | 东莞捷荣技术股份有限公司 | Electronic flexible rule capable of displaying variable quantity and measurement method thereof |
| CN104700250A (en) * | 2015-03-16 | 2015-06-10 | 河海大学常州校区 | Intelligent volume measuring device and weighing and volume measuring integrated system |
| CN107677170A (en) * | 2017-10-25 | 2018-02-09 | 泸县玉流机械制造有限责任公司 | Digital tape measure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |