CN103040472A - Device for measuring heights of infants semi-automatically - Google Patents
Device for measuring heights of infants semi-automatically Download PDFInfo
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- CN103040472A CN103040472A CN2013100190834A CN201310019083A CN103040472A CN 103040472 A CN103040472 A CN 103040472A CN 2013100190834 A CN2013100190834 A CN 2013100190834A CN 201310019083 A CN201310019083 A CN 201310019083A CN 103040472 A CN103040472 A CN 103040472A
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Abstract
A device for measuring heights of infants semi-automatically comprises a mechanical device, an electronic circuit, a single chip microcomputer (SCM) and a control program which is embedded in the SCM as a whole, wherein the mechanical device comprises a movable baffle, a count start button, a fixed baffle, a double-way pulse sensor, a pull wire and sheaves, wherein the pull wire is wound on the two sheaves and connected with the movable baffle, the double-way pulse sensor is arranged outside one sheave with the pull wire, the fixed baffle is arranged at one end of the double-way pulse sensor, and the count start button is arranged on one side of the fixed baffle. The electronic circuit comprises a count start button, a double-way pulse encoder, a filter shaping circuit, a keyboard device, a display device, an RS232 interface and an SCM which is the STC89C58RD+ with a central processing unit (CPU) as an enhancement type 51 kernel. The device is simple in whole structure, convenient to install, operate and use, good in stability and high in reliability.
Description
Technical field
The present invention relates to body height measuring device, relate in particular to a kind of semi-automatic infant height measuring device.
Background technology
During now infant health check-up, particularly still can not stand or the less infant of astasia, need to lie on a bed and measure its height.Generally measure height lying down and be called the measurement height.The method of existing measurement infant height mainly contains following several: use ruler measurement 1..Two kinds of situations are generally arranged, and a kind of is directly with ruler infant to be measured; Another kind is to measure bedside along drawing rule, utilizing rule to measure after infant is lain down.These two kinds of methods measure complete after, all need to record by hand the result, the result that will measure again is input to by hand other device and edits, puts in order or with certain standard the height of infant is estimated etc.This kind method certainty of measurement is lower, and general error is 1-5 millimeter or higher, and complex operation, and efficient is low.2. utilize ultrasound wave to measure.Utilize the time difference method principle of ultrasonic reflections to measure.This measuring method cooperates certain circuit or intelligent apparatus, can realize automatic record or the teletransmission of measurement result.This method is (speed that ultrasound wave is propagated in air and temperature correlation) in the situation of ultrasound wave being carried out temperature-compensating, and measurement error is generally 5 millimeter.But ultrasound probe has fixing blind area, is generally 34-40 centimetres, and this is just so that the measurement bed must comprise the blanking length of ultrasound probe, so that it is longer to measure bed bed body, heaviness also just seems.Bed body between ultrasound probe and measurement baffle plate must be smooth in addition, coarse point must not be arranged, otherwise can cause ultrasonic reflections, causes and measure unsuccessfully.The circuit of ultrasonic emitting, reception is complicated, and fault rate is higher, safeguards also cumbersome.3. utilize pulse counting method to measure.Utilize certain machinery to make measurement baffle belt tremulous pulse rush sensor and rotate, the distance of measuring like this baffle plate pulling just is converted to the umber of pulse of impulser.Select the high impulser of P/R (revolution output umber of pulse) to make and measure and reach degree of precision.Generally can arrive 1-3 millimeters, even≤± 0.5 millimeter.Automatic record or teletransmission that this method cooperates certain circuit or intelligent apparatus can realize measurement result.The shortcoming of this method maximum is one direction to spur the measurement baffle plate, and the measurement baffle plate is spurred to direction of measurement, as long as to moving once in the other direction, the counting of pulse will be many, and this measurement will be cancelled.When actual measurement infant height, child one is moving sometimes, touch to measure baffle plate and rock in the other direction, or the shake of gauger's hands or the gauger situation of pulling back unintentionally etc., all can cause measuring error, so that measuring, this cancels.This just causes measurement very inconvenient, sometimes needs repeated measurement, and efficient is lower.More seriously gauger's hands is shaken or is pulled back unintentionally, but gauger itself and miss, the measurement result mistake, but the gauger thinks that the result is correct.
All there is the deficiency in the measurement in above several method, thereby real work is impacted.
Summary of the invention
The object of the invention is to, overcome defective and the deficiency of prior art, for the measurement of infant height provide a kind of semi-automatic, easy and simple to handle, measure accurately semi-automatic infant height measuring device.
Semi-automatic infant height measuring device of the present invention includes generally machinery, electronic circuit and single-chip microcomputer and is embedded in control sequence in the single-chip microcomputer.Wherein machinery includes sideboard, counting start button, fixed dam, two-way impulser, backguy and sheave.Guy winding is connected with sideboard in the backguy on two sheaves, in a sheave outside that is wound with backguy, be provided with the two-way impulser, being provided with an end of two-way impulser, be provided with fixed dam, side at fixed dam is provided with the counting start button.Electronic circuit includes counting start button, two-way pulse codr, filtering shaping circuit, key board unit, display device, RS232 interface and single-chip microcomputer.Single-chip microcomputer is that central processor CPU is the STC89C58RD+ of enhancement mode 51 kernels, and the control sequence of its embedding includes orthogonal pulses decoding program, step-by-step counting program, self calibration coefficient calculations program, height calculation procedure, Keyboard management program, display routine.The two-way pulse codr is connected to single-chip microcomputer by filtering shaping circuit, and other has counting start button and key board unit to be connected to single-chip microcomputer, is connected with simultaneously display device and RS232 interface on the single-chip microcomputer.When implement measuring, the present invention needn't operate any device and can allow to move freely before and after the sideboard and measure, and is very easy to the actual measurement operation.Measure complete after, height numerical value automatically reads, shows, goes back usable criterion RS232 interface and carries out teletransmission.Single-chip microcomputer used in the present invention is that central processor CPU is the STC89C58RD+ of enhancement mode 51 kernels.What the two-way pulse codr was exported is the orthogonal pulses signal, and the phase contrast between pulse A and the pulse B is 90 degree.Filtering shaping circuit includes R5, R10, C25, C30 and chip U4-74HC14.The orthogonal pulses signal of two-way pulse codr output is input to first filtering shaping circuit, after shaping and removing interference, orthogonal pulses signal A and the B of output, its phase contrast are 90 degree, and the P0.5 foot of A phase pulse access single-chip microcomputer, the P3.3 foot of B phase pulse access single-chip microcomputer.The P1.7 foot of counting start button access single-chip microcomputer.Single-chip microcomputer and Keyboard Control and digital pipe display circuit use the mode connected in series of twin wire, P2.0, P2.1, P2.2, the P2.3 foot of access single-chip microcomputer.Keyboard Control and charactron display chip are CH452L.The single-chip microcomputer control program of measuring height comprises the steps:
1, beginning, program initialization;
2, detect button, whether have the button of measurement " height " to press;
Press if 3 do not detect " height " button, then forward step 2 to; If have, then forward step 4 to;
4, wait for that sideboard touches the counting start button;
If 5 sideboards have touched the counting start button, then forward step 6 to; If sideboard does not touch the counting start button, then forward step 4 to;
6, call orthogonal pulses decoding program, step-by-step counting program;
7, detect button, whether have the button of measurement " height " to press; In the meantime, sideboard can move forward and backward at any time;
Press if 8 do not detect " height " button, then forward step 7 to; If have, then forward step 9 to;
9, call height calculation procedure, display routine and RS232 interface convey program.
Semi-automatic infant height measuring device of the present invention includes machinery, electronic circuit and single-chip microcomputer and is embedded in control sequence in the single-chip microcomputer.Wherein machinery includes sheave, fixed dam, sideboard and backguy.Electronic circuit includes counting start button, two-way pulse codr, filtering shaping circuit, key board unit, display device and RS232 standard interface.Single-chip microcomputer is that central processor CPU is the STC89C58RD+ of enhancement mode 51 kernels, and the control sequence of its embedding includes orthogonal pulses decoding program, step-by-step counting program, self calibration coefficient calculations program, height calculation procedure, Keyboard management program and display routine.During measurement, semi-automatic infant height measuring device of the present invention needn't operate any device and can allow to move freely before and after the sideboard and measure, and is very easy to the actual measurement operation, has improved work efficiency.This does not also have in of the same type, connatural product.Measure complete after, height numerical value automatically reads and shows, goes back usable criterion RS232 mouth and carries out teletransmission.Select the high pulse codr (such as P/R=1000) of P/R (revolution output umber of pulse) can make certainty of measurement reach≤± 0.5 millimeter.Precision far above other method measurement.The present invention takes as far as possible to replace with software function the method for hardware capability so that periphery circuit succinct, exempt from debugging, cost is low, reliable and stable.The power supply of semi-automatic infant height measuring device of the present invention all adopts low pressure+5V power supply, and high pressure has not improved reliability.The present invention adopts the orthogonal pulses decoding program of innovation, so that when measuring, needn't operate any device and can allow to move freely before and after the sideboard and measure, and is very easy to the actual measurement operation.This does not also have in of the same type, connatural product.The present invention does not have the desired blind area of ultrasound probe, so the measurement bed better appearance of making, small and exquisite, practical.The present invention has self calibration coefficient calculations program, and the requirement of paired pulses encoder and machinery is lower.Pulse codr is only required the output umber of pulse that energy is stable, and two paths of signals phase phase difference 90 degree get final product; As long as the requirement to machinery makes the measurement baffle plate can normally drive the impulser rotation.Can make so whole device have that stability is strong, reliability is high, be conducive to the characteristics such as large-scale production.
Semi-automatic infant height measuring device of the present invention, overall structure is simple, installation and easy for operation, good stability, reliability is high.Use semi-automatic infant height measuring device of the present invention, can realize easy and simple to handlely, measure accurately.
Description of drawings
Accompanying drawing 1 is the electrical block diagram of semi-automatic infant height measuring device of the present invention, accompanying drawing 2 is frame for movement sketch maps of semi-automatic infant height measuring device of the present invention, accompanying drawing 3 is electrical schematic diagrams of semi-automatic infant height measuring device of the present invention, and accompanying drawing 4 is control block diagram of the single-chip microcomputer control program of semi-automatic infant height measuring device of the present invention.1-two-way pulse codr, 2-filtering shaping circuit 3-counting start button 4-display device 5-RS232 interface 6-key board unit 7-single-chip microcomputer 8-sideboard 9-fixed dam 10-two-way impulser 11-backguy 12-sheave.
The specific embodiment
Referring now to accompanying drawing 1, accompanying drawing 2, accompanying drawing 3 and accompanying drawing 4, as follows in conjunction with implementation: semi-automatic infant height measuring device of the present invention includes generally machinery, electronic circuit and single-chip microcomputer 7 and is embedded in control sequence in the single-chip microcomputer 7.Wherein machinery includes sideboard 8, counting start button 3, fixed dam 9, two-way impulser 10, backguy 11 and sheave 12.Backguy 11 is wrapped on two sheaves 12, be connected with sideboard 8 in the backguy 11, in sheave 12 outsides that are wound with backguy 11, be provided with two-way impulser 10, be provided with an end of two-way impulser 10, be provided with fixed dam 9, in a side of fixed dam 9, be provided with counting start button 3.Electronic circuit includes counting start button 3, two-way pulse codr 1, filtering shaping circuit 2, key board unit 6, display device 4, RS232 interface 5 and single-chip microcomputer 7.Single-chip microcomputer 7 is that central processor CPU is the STC89C58RD+ of enhancement mode 51 kernels, and the control sequence of its embedding includes orthogonal pulses decoding program, step-by-step counting program, self calibration coefficient calculations program, height calculation procedure, Keyboard management program, display routine.Two-way pulse codr 1 is connected to single-chip microcomputer 7 by filtering shaping circuit 2, and other has counting start button 3 and key board unit 6 to be connected to single-chip microcomputer 7, is connected with simultaneously display device 4 and RS232 interface 5 on the single-chip microcomputer 7.When implement measuring, the present invention needn't operate any device and can allow to move freely before and after the sideboard and measure, and is very easy to the actual measurement operation.Measure complete after, height numerical value automatically reads, shows, goes back usable criterion RS232 interface and carries out teletransmission.Single-chip microcomputer 7 used in the present invention is that central processor CPU is the STC89C58RD+ of enhancement mode 51 kernels.What two-way pulse codr 1 was exported is the orthogonal pulses signal, and the phase contrast between pulse A and the pulse B is 90 degree.Filtering shaping circuit 2 includes R5, R10, C25, C30 and chip U4-74HC14.The orthogonal pulses signal of two-way pulse codr 1 output is input to first filtering shaping circuit 2, after shaping and removing interference, orthogonal pulses signal A and the B of output, its phase contrast are 90 degree, and the P0.5 foot of A phase pulse access single-chip microcomputer 7, the P3.3 foot of B phase pulse access single-chip microcomputer 7.The P1.7 foot of counting start button 3 access single-chip microcomputers 7.Single-chip microcomputer 7 and Keyboard Control and digital pipe display circuit use the mode connected in series of twin wire, P2.0, P2.1, P2.2, the P2.3 foot of access single-chip microcomputer 7.Keyboard Control and charactron display chip are CH452L.The single-chip microcomputer control program of measuring height comprises the steps:
1, beginning, program initialization;
2, detect button, whether have the button of measurement " height " to press;
Press if 3 do not detect " height " button, then forward step 2 to; If have, then forward step 4 to;
4, wait for that sideboard touches the counting start button;
If 5 sideboards have touched the counting start button, then forward step 6 to; If sideboard does not touch the counting start button, then forward step 4 to;
6, call orthogonal pulses decoding program, step-by-step counting program;
7, detect button, whether have the button of measurement " height " to press; In the meantime, sideboard can move forward and backward at any time;
Press if 8 do not detect " height " button, then forward step 7 to; If have, then forward step 9 to;
9, call height calculation procedure, display routine and RS232 interface convey program.
Semi-automatic infant height measuring device of the present invention includes machinery, electronic circuit and single-chip microcomputer and is embedded in control sequence in the single-chip microcomputer.Wherein machinery includes sheave, fixed dam, sideboard and backguy.Electronic circuit includes counting start button, two-way pulse codr, filtering shaping circuit, key board unit, display device and RS232 standard interface.Single-chip microcomputer is that central processor CPU is the STC89C58RD+ of enhancement mode 51 kernels, and the control sequence of its embedding includes orthogonal pulses decoding program, step-by-step counting program, self calibration coefficient calculations program, height calculation procedure, Keyboard management program and display routine.During measurement, semi-automatic infant height measuring device of the present invention needn't operate any device and can allow to move freely before and after the sideboard and measure, and is very easy to the actual measurement operation, has improved work efficiency.This does not also have in of the same type, connatural product.Measure complete after, height numerical value automatically reads and shows, goes back usable criterion RS232 mouth and carries out teletransmission.Select the high pulse codr (such as P/R=1000) of P/R (revolution output umber of pulse) can make certainty of measurement reach≤± 0.5 millimeter.Precision far above other method measurement.The present invention takes as far as possible to replace with software function the method for hardware capability so that periphery circuit succinct, exempt from debugging, cost is low, reliable and stable.The power supply of semi-automatic infant height measuring device of the present invention all adopts low pressure+5V power supply, and high pressure has not improved reliability.The present invention adopts the orthogonal pulses decoding program of innovation, so that when measuring, needn't operate any device and can allow to move freely before and after the sideboard and measure, and is very easy to the actual measurement operation.This does not also have in of the same type, connatural product.The present invention does not have the desired blind area of ultrasound probe, so the measurement bed better appearance of making, small and exquisite, practical.The present invention has self calibration coefficient calculations program, and the requirement of paired pulses encoder and machinery is lower.Pulse codr is only required the output umber of pulse that energy is stable, and two paths of signals phase phase difference 90 degree get final product; As long as the requirement to machinery makes the measurement baffle plate can normally drive the impulser rotation.Can make so whole device have that stability is strong, reliability is high, be conducive to the characteristics such as large-scale production.
When sideboard 8 moves, drive two-way pulse codr 1 by backguy 11 and sheave 12 and rotate, thus the output orthogonal pulse signal.Fixed dam 9, as the initiating terminal of measuring height, the above is equipped with counting start button 3.During measurement, sideboard 8 touches first counting start button 3, after central processor CPU recognizes " counting beginning " button and touched, begins to call the orthogonal pulses decoding program, the step-by-step counting program is counted.Sideboard 8 moves freely before and after at this moment can be arbitrarily, and the step-by-step counting program is the identification counting automatically.When sideboard 8 moves, drive two-way pulse codr 1 by backguy 11 and sheave 12 and rotate, thus the output orthogonal pulse signal.Namely export pulse A and the B of two-way phase phase difference 90 degree, the phase relation of two-way pulse is relevant with the encoder direction of rotation, also namely relevant with the pulling direction of sideboard 8, when encoder forward (clockwise) rotates, the leading B phase of A phase impulse phase pulse 90 degree; When encoder reverse (counterclockwise) rotation, the leading A phase of B phase impulse phase pulse 90 degree; This two-way pulse is via R5, C25, R10, C30, the filtering shaping circuit that U4 forms, as shown in Figure 3, after removing clutter and interference, entering single-chip microcomputer is P0.5 and the P3.3 foot of central central processor CPU U5, carries out software decode, determines encoder direction of rotation and the umber of pulse of exporting under this direction.Behind the measurement button on pressing key board unit 6 and counting start button 3 effectively the time, single-chip microcomputer U5 begins the two pulse signals of input is carried out software decode, for making certainty of measurement high, reliable and stable, algorithm to software decode is innovated, take pulse A as benchmark, when its impulse level is 0, the state of difference recording impulse A and pulse B; When its impulse level is 1, distinguish again the state of recording impulse A and pulse B; 4 variablees have so just been arranged, according to the encoder Principle of Rotating these 4 variablees are judged simultaneously, the direction of telling the encoder rotation that can be stable and the umber of pulse of under this direction, exporting, umber of pulse under this both direction is counted respectively, pass through again computing, namely draw a umber of pulse under the direction.According to the index of measuring bed measurement infant height, for example: its height measuring range is 30-100 centimetres, then coverage is 70 centimetres, namely 700 millimeters, measure 700 millimeters of baffle plate pullings, umber of pulse is 4000, then 1 millimeter to amount to umber of pulse be 5.71, or a pulse amounts to 0.175 millimeter, thereby calculates the distance of measuring the actual movement of baffle plate.Deduct with the total length of measuring bed and to measure the height value that distance that baffle plate moves namely draws infant.After calculating the height value of infant, single-chip microcomputer U5 send display device 4 to show measured value, sends into simultaneously RS232 interface arrangement 5 and carries out data remote.When actual scale volume production, because the difference of frame for movement and encoder etc., measure 700 millimeters distances of baffle plate pulling, the umber of pulse that produces is inconsistent, if with an operation coefficient, the actual mobile distance of the measurement baffle plate that calculates has larger difference, for this situation, has introduced self calibration coefficient calculations program in device.In the fixing situation of frame for movement and encoder, take the height measuring range as 30-100 centimetres as example, specific algorithm is as follows: 1. record measurement baffle plate is moved 30 centimeters to, the umber of pulse that produces.2. record is measured baffle plate and is moved 100 centimeters to, the umber of pulse that produces.3. calculate 70 centimetres of corresponding impulse ratios.After having introduced self calibration coefficient calculations program, when having solved volume production because the larger error that the difference of frame for movement and encoder etc. causes.Semi-automatic infant height measuring device of the present invention, overall structure is simple, installation and easy for operation, good stability, reliability is high.Use semi-automatic infant height measuring device of the present invention, can realize easy and simple to handlely, measure accurately.
Claims (5)
1. semi-automatic infant height measuring device, include generally machinery, electronic circuit and single-chip microcomputer (7) and be embedded in control sequence in the single-chip microcomputer (7), it is characterized in that machinery includes sideboard (8), counting start button (3), fixed dam (9), two-way impulser (10), backguy (11) and sheave (12), backguy (11) is wrapped on two sheaves (12), be connected with sideboard (8) in the backguy (11), in a sheave (12) outside that is wound with backguy (11), be provided with two-way impulser (10), at an end that is provided with two-way impulser (10), be provided with fixed dam (9), in a side of fixed dam (9), be provided with counting start button (3).
2. semi-automatic infant height measuring device according to claim 1, it is characterized in that electronic circuit includes counting start button (3), two-way pulse codr (1), filtering shaping circuit (2), key board unit (6), display device (4), RS232 interface (5) and single-chip microcomputer (7), single-chip microcomputer (7) is that central processor CPU is the STC89C58RD+ of enhancement mode 51 kernels, and the control sequence of its embedding includes the orthogonal pulses decoding program, the step-by-step counting program, self calibration coefficient calculations program, the height calculation procedure, the Keyboard management program, display routine.
According to claim 1 with semi-automatic infant height measuring device claimed in claim 2, it is characterized in that two-way pulse codr (1) is connected to single-chip microcomputer (7) by filtering shaping circuit (2), other has counting start button (3) and key board unit (6) to be connected to single-chip microcomputer (7), is connected with simultaneously display device (4) and RS232 interface (5) on the single-chip microcomputer (7).
According to claim 1 with semi-automatic infant height measuring device claimed in claim 2, the orthogonal pulses signal that it is characterized in that two-way pulse codr (1) output is input to first filtering shaping circuit (2), after shaping and removing interference, orthogonal pulses signal A and the B of output, its phase contrast is 90 degree, and the P0.5 foot of A phase pulse access single-chip microcomputer (7), the P3.3 foot of B phase pulse access single-chip microcomputer (7); The P1.7 foot of counting start button (3) access single-chip microcomputer (7); Single-chip microcomputer (7) and Keyboard Control and digital pipe display circuit use the mode connected in series of twin wire, P2.0, P2.1, P2.2, the P2.3 foot of access single-chip microcomputer (7); Keyboard Control and charactron display chip are CH452L.
According to claim 1 with semi-automatic infant height measuring device claimed in claim 2, it is characterized in that the single-chip microcomputer control program of measuring height comprises the steps:
1, beginning, program initialization;
2, detect button, whether have the button of measurement " height " to press;
Press if 3 do not detect " height " button, then forward step 2 to; If have, then forward step 4 to;
4, wait for that sideboard touches the counting start button;
If 5 sideboards have touched the counting start button, then forward step 6 to; If sideboard does not touch the counting start button, then forward step 4 to;
6, call orthogonal pulses decoding program, step-by-step counting program;
7, detect button, whether have the button of measurement " height " to press; In the meantime, sideboard can move forward and backward at any time;
Press if 8 do not detect " height " button, then forward step 7 to; If have, then forward step 9 to;
9, call height calculation procedure, display routine and RS232 interface convey program.
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| CN2013100190834A CN103040472A (en) | 2013-01-20 | 2013-01-20 | Device for measuring heights of infants semi-automatically |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2178502Y (en) * | 1993-12-11 | 1994-10-05 | 北京驰名科技开发公司 | Electronic admeasuring apparatus for children |
| US5499457A (en) * | 1993-10-15 | 1996-03-19 | Olympic Medical Group | Infant length and weight measuring apparatus |
| KR20000050794A (en) * | 1999-01-14 | 2000-08-05 | 문제규 | weight &height horizontal device of measurement for baby |
| CN2479490Y (en) * | 2001-04-09 | 2002-02-27 | 郑州市科苑电子有限公司 | Electronic balance for babies |
| CN2604150Y (en) * | 2003-03-04 | 2004-02-25 | 姜述乐 | Measuring instrument for height and weight of a person |
| TWM356495U (en) * | 2008-11-18 | 2009-05-11 | Charder Electronic Co Ltd | Digital measurement device for baby's height and digital baby height and weight measurement equipment associated with the digital measurement device for baby's height |
| CN202631081U (en) * | 2012-05-28 | 2012-12-26 | 深圳清华大学研究院 | Infant electronic measurement device |
-
2013
- 2013-01-20 CN CN2013100190834A patent/CN103040472A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5499457A (en) * | 1993-10-15 | 1996-03-19 | Olympic Medical Group | Infant length and weight measuring apparatus |
| CN2178502Y (en) * | 1993-12-11 | 1994-10-05 | 北京驰名科技开发公司 | Electronic admeasuring apparatus for children |
| KR20000050794A (en) * | 1999-01-14 | 2000-08-05 | 문제규 | weight &height horizontal device of measurement for baby |
| CN2479490Y (en) * | 2001-04-09 | 2002-02-27 | 郑州市科苑电子有限公司 | Electronic balance for babies |
| CN2604150Y (en) * | 2003-03-04 | 2004-02-25 | 姜述乐 | Measuring instrument for height and weight of a person |
| TWM356495U (en) * | 2008-11-18 | 2009-05-11 | Charder Electronic Co Ltd | Digital measurement device for baby's height and digital baby height and weight measurement equipment associated with the digital measurement device for baby's height |
| CN202631081U (en) * | 2012-05-28 | 2012-12-26 | 深圳清华大学研究院 | Infant electronic measurement device |
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Application publication date: 20130417 |