CN100594472C - Device and method of measuring body displacement - Google Patents
Device and method of measuring body displacement Download PDFInfo
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- CN100594472C CN100594472C CN200510113201A CN200510113201A CN100594472C CN 100594472 C CN100594472 C CN 100594472C CN 200510113201 A CN200510113201 A CN 200510113201A CN 200510113201 A CN200510113201 A CN 200510113201A CN 100594472 C CN100594472 C CN 100594472C
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Abstract
The invention relates to the method used to measure object displacement. It includes the following steps: generating frequency conversion drive signal includes the first and second sub components withdifferent frequency which respectively has ascent and descent stages to emit one laser beam; casting the laser beam to one object surface, reflecting and receiving one mixed signal which has the first and second sub signals corresponding to the ascent and descent stages of the first sub component, has the third and fourth sub signals corresponding to the second one; receiving the mixed signal andoutputting pulse numbers from the first to the fourth corresponding with the signals; confirming the object displacement according to one of the differences between the first and second pulse numbers, the third and fourth ones.
Description
Technical field
The present invention relates to a kind of device of displacement of Measuring Object, particularly relate to a kind of device that utilizes the displacement of laser measurement object.
Background technology
Have on the market and much utilize optical characteristics, for example be applied to the optical mouse of computing machine to detect the input media of displacement.One optical sensor is arranged at the optical mouse bottom, captures a plurality of images at regular intervals, and decides the displacement of mouse by the difference of processor comparison institute picked image picture.
Optical mouse general is because its accuracy is preferable in the mechanical type mouse that utilizes ball (mouse ball).In addition, if be applied in the portable type electronic product, PDA for example, therefore and inapplicable optical mouse the user there is no flat surfaces and moves for optical mouse in moving.
The U.S. Pat 6,707,027 of Philip has disclosed a kind of input media that measures displacement, and it utilizes the Doppler effect (Doppler shift) of laser and detects the displacement of pointing, and required area is very little, is suitable on the portable electronic devices.Yet during fast moving, this kind input media also can't detect displacement accurately at finger, makes coordinate seem slow in reacting and cause inconvenience in the use at screen.
Summary of the invention
In view of this, the purpose of this invention is to provide mobile at a slow speed the displacement of reaching fast of a kind of effective inspected object with correct judgement object.
According to purpose of the present invention, a kind of method of Measuring Object displacement is proposed, produce the frequency conversion drive signal to send a laser beam.The frequency conversion drive signal comprises first subconstiuent and second subconstiuent of different frequency, and it comprises ascent stage and decline stage respectively.Then, projecting laser Shu Yuyi object surfaces and reflection receive a mixed-signal, and wherein, corresponding to the rise and fall stage of first subconstiuent, mixed-signal has first and second sub-signal; Corresponding to the rise and fall stage of second subconstiuent, mixed-signal has the 3rd and the 4th sub-signal.Then, receive mixed-signal, and output corresponds respectively to first to fourth umber of pulse of first to fourth sub-signal, and determine the displacement of object according to one of the difference of first and second umber of pulse and difference of the 3rd ripple and the 4th umber of pulse at least.
According to purpose of the present invention, a kind of device of displacement of optical measurement one object is proposed, comprise driver element, laser diode and optical sensor.Driver element produces a frequency conversion drive signal.The frequency conversion drive signal comprises first subconstiuent and second subconstiuent of different frequency, and first subconstiuent and this second subconstiuent comprise that respectively an ascent stage reaches depression of order section.Laser diode receives the frequency conversion drive signal to send a laser beam, and wherein, laser beam is projeced into this object surfaces and reflects through it.Optical sensor is according to this laser pick-off one mixed-signal of reflection, wherein, corresponding to the ascent stage and the decline stage of first subconstiuent, mixed-signal has one first and one second sub-signal, corresponding to the rise and fall stage of second subconstiuent, mixed-signal has one the 3rd and one the 4th sub-signal, and optical sensor and output correspond respectively to first to fourth umber of pulse of first to fourth sub-signal.Wherein, driver element produces first pulse difference according to the difference of first umber of pulse and second umber of pulse, difference according to the 3rd umber of pulse and the 4th umber of pulse produces second pulse difference, and is determined the displacement of object according to one of first and second pulse difference at least by driver element.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and be described with reference to the accompanying drawings as follows.
Description of drawings
Fig. 1 shows the calcspar according to the input media of the displacement of a kind of Measuring Object of preferred embodiment of the present invention.
Fig. 2 A shows frequency conversion drive signal waveform figure.
The oscillogram of mixed-signal has been shown among Fig. 2 B.
Fig. 3 shows the oscillogram of mixed-signal pulse.
Fig. 4 shows the calcspar according to the input media of the displacement of a kind of Measuring Object of another embodiment of the present invention.
Fig. 5 shows the process flow diagram according to the method for the displacement of a kind of Measuring Object of preferred embodiment of the present invention.
The reference numeral explanation
100,400: input media
110: driver element
120: laser diode
130: optical sensor
410: variable frequency drive unit
Obj: object
LB: laser beam
10,12,14,22,30,32,34: waveform
P1, P2: first subconstiuent, second subconstiuent
H1, H2: ascent stage
L1, L2: decline stage
R1, R2, R3, R4: first, second, third, fourth sub-signal
Im: mixed-signal
Id: frequency conversion drive signal
Embodiment
The U.S. Pat 6 of Philip, the input media of 707, the 027 measurement displacements that disclose, its driving signal that uses fixed frequency is with the driving laser diode, this mode only is fit to detect specific movement of objects speed, can detect inaccurate phenomenon when excessive velocities.
Please refer to Fig. 1, it shows the calcspar according to the input media of the displacement of a kind of Measuring Object of the present invention.Input media 100 comprises driver element 110, laser diode 120 and optical sensor 130.Driver element 110 produces a frequency conversion drive signal Id with driving laser diode 120.Present embodiment uses the driving signal Id with different frequency with the driving laser diode, therefore all can detect accurately when the speed of object is fast or slow.Fig. 2 A is a frequency conversion drive signal Id oscillogram.The sub-faster composition of label 1 expression frequency, label 2 takes second place, and label 3 is the slowest.Drive signal Id and can be one of waveform 10,12 or 14.It alternately is subconstiuent fast, fast, slow, slow (1,1,3,3) frequency that waveform 10 has; It alternately is subconstiuent slow, fast, slow, fast (3,1,3,1) frequency that waveform 12 has; Waveform 14 has soon, in, the subconstiuent of slow (1,2,3) frequency.With waveform 12 is example, shown in 2B figure, frequency conversion drive signal Id comprises first subconstiuent P1 of slow frequency and the second subconstiuent P2 of very fast frequency, and the first subconstiuent P1 has ascent stage H1 and decline stage L1, and second subconstiuent has ascent stage H2 and decline stage L2.
In 2B figure, mixed-signal Im is a waveform 22, have one first sub-signal R1 and one second sub-signal R2, ascent stage H1 and decline stage L1 corresponding to the first subconstiuent P1, also have one the 3rd sub-signal R3 and one the 4th sub-signal R4, corresponding to ascent stage H2 and the decline stage L2 of the second subconstiuent P2.When object Obj was transfixion, the wave number of the first sub-signal R1 and the second sub-signal R2 was for equating, and the wave number of the 3rd sub-signal R3 and the 4th sub-signal R4 is also for equating.
When object Obj towards or when moving away from the direction of laser beam LB, folded light beam experience Doppler effect, thereby cause frequency displacement makes mixed-signal Im present the signal pulse on Fig. 3 waveform.When mixed-signal Im shown in waveform 32, its expression object Obj moves (towards the direction of laser beam LB institute conduct) forward, the sub-signal R1 of mixed-signal and the wave number of R3 are respectively greater than the wave number of its sub-signal R2 and R4.And when object Obj is mobile backward (away from the direction of laser beam LB institute conduct), mixed-signal Im will present as waveform 34, opposite result when mobile forward with object Obj.And the conduct speed of umber of pulse and object more has substantial connection.Therefore, in the sufficient relation of utilizing between the two, just can learn conduct speed speed and the direction of object Obj by observing umber of pulse.
By this, after optical sensor 130 receives mixed-signal Im, promptly calculate its frequency corresponds respectively to the first sub-signal R1, the second sub-signal R2, the 3rd sub-signal R3 and the 4th sub-signal R4 with output the first umber of pulse C1, the second umber of pulse C2, the 3rd umber of pulse C3 and the 4th umber of pulse C4.The difference of 110 foundations of driver element, the first umber of pulse C1 and the second umber of pulse C2 is calculated and is produced the first pulse difference D1, and produces the second pulse difference D2 according to the difference calculating of the 3rd umber of pulse C3 and the 4th umber of pulse C4.
In theory, the first pulse difference D1 and the second pulse difference D2 should be identical, and the frequency change that is not driven signal Id influences.Yet, be subjected to object Obj translational speed influence and the error that produces makes the pulse difference D1 that wins often be not equal to the second pulse difference D2.When object Obj fast moving, utilize the first subconstiuent P1 of low frequency (slower), possibly can't obviously differentiate pulse difference D1 between rising cycle and decline cycle.At this moment, just need detect pulse difference D2 by the second subconstiuent P2 of higher-frequency.Illustrate, when the frequency of the first subconstiuent P1 is 1kHz, when corresponding R1 and the first umber of pulse C1 of R2 and the frequency that the second umber of pulse C2 for example is respectively 100 and 99, the second subconstiuent P2 are 10kHz, and corresponding R3 and the 3rd umber of pulse C3 and the 4th umber of pulse C4 of R4 are 10 and 4.Therefore, D1 equals 100-99=1 and D2 equals 10-4=6.Therefore, with respect to D1, can more clearly learn the 3rd umber of pulse C3 in the cycle of rising greater than the 4th umber of pulse C4 that rises the cycle down by D2, the moving direction of representing object is forward.That is to say that when object Obj fast moving, the second pulse difference D2 more can correctly represent the moving direction of object.What in addition, driver element 110 also can be according to the first pulse difference D1 and this second pulse difference D2 on average decides this moving direction.In this example, the mean value of the first pulse difference D1 and the second pulse difference D2 is 3.5, and therefore, the driver element 110 just moving direction of decidable object is forward.
That is to say that by the subconstiuent of different frequency, the frequency of for example setting P1 and P2 is respectively 1kHz and 100kHz, can allow P2 that the mobile detection rates of 100 times of P1 is arranged, reach higher resolution, more to accurately detect object Obj moving extremely fast.Therefore, by the translational speed of object Obj, processor 110 just can be according to the displacement of one of at least the first pulse difference D1 and second pulse difference D2 decision object Obj.
The form of frequency conversion drive signal Id is except the waveform shown in Fig. 2 A 10,12,14, other all variation still can be arranged, or use two groups of laser diodes, respectively with different frequency drives, still can reach the purpose that can in the different objects translational speed, still can accurately judge direction.
Please refer to Fig. 4, it shows the calcspar according to the input media 400 of the displacement of a kind of optical measurement one object of a preferred embodiment of the present invention.Input media 400 comprises variable frequency drive unit 410, laser diode 120 and optical sensor 130.Variable frequency drive unit 410 is in order to producing frequency conversion drive signal Id with driving laser diode 120 LB that gives off laser beam, and the mixed-signal Im of the reflection that receives with optical sensor 130.Variable frequency drive unit 410 also has functions such as sequential control, back coupling control and data processing.Frequency conversion drive signal Id comprises the subconstiuent of a plurality of different frequencies, as the first subconstiuent P1 and the second subconstiuent P2, changes its frequency by driver element 110 according to the translational speed of object Obj.When the translational speed of object Obj was very fast, the more available so that average frequency of the subconstiuent of frequency conversion drive signal of driver element 110 was adjusted into higher, otherwise, then make the average frequency of subconstiuent be adjusted into lower.
Please refer to Fig. 5, it shows the process flow diagram according to the method for the displacement of a kind of Measuring Object of preferred embodiment of the present invention.The method of present embodiment starts from step 510, produces frequency conversion drive signal Id with driving laser diode 120, with the LB that gives off laser beam.Then, in step 520, the projecting laser bundle reflects in the surface of object Obj and through it, produces reflected light.Then, in step 530,, and receive mixed-signal Im according to the laser certainly mixed (self-mixing) of reflected light and laser LB.Then, in step 540, utilize optical sensor 130 to receive mixed-signal Im, and output correspond respectively to the first umber of pulse C1, the second umber of pulse C2, the 3rd umber of pulse C3 and the 4th umber of pulse C4 of the first sub-signal R1, the second sub-signal R2, the 3rd sub-signal R3 and the 4th sub-signal R4.Then, in step 550, the difference of the foundation first umber of pulse C1 and the second umber of pulse C2 produces the first pulse difference D1, and produces the second pulse difference D2 according to the difference of the 3rd umber of pulse C2 and the 4th umber of pulse C4.Then, in step 560, the displacement of decision object Obj according to one of at least the first pulse difference D1 and second pulse difference D2.
Therefore, utilize the method and the device embodiment of the displacement of the disclosed optical measurement of the above embodiment of the present invention one object, when movement of objects gets when very fast, just can decide displacement by the P2 and the second pulse difference D2 of upper frequency, and get when slow when movement of objects, just can decide displacement by the P1 and the first pulse difference D1 of lower frequency, utilize fixed frequency to remedy tradition, the variation of particular range can only be detected, and shortcoming quick or that slowly move can't be detected.At portable electronic devices, each can effectively detect moving of user's finger, with judicious coordinate position.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; those skilled in the art can be used for a variety of modifications and variations under the premise without departing from the spirit and scope of the present invention, so protection scope of the present invention is as the criterion with claim of the present invention.
Claims (12)
1. method of measuring an ohject displacement comprises:
Produce a frequency conversion drive signal to drive a laser diode, to send a laser beam, this frequency conversion drive signal comprises first subconstiuent and second subconstiuent of different frequency, and this first subconstiuent and this second subconstiuent comprise that respectively an ascent stage reaches depression of order section;
Throwing this laser beam reflects in this object surfaces and through it;
According to this laser pick-off one mixed-signal of reflection, wherein, corresponding to this ascent stage and this decline stage of this first subconstiuent, this mixed-signal has one first sub-signal and one second sub-signal;
Corresponding to this ascent stage and this decline stage of this second subconstiuent, this mixed-signal has one the 3rd sub-signal and one the 4th sub-signal;
Utilize an optical sensor to receive this mixed-signal, and output correspond respectively to one first umber of pulse, one second umber of pulse, one the 3rd umber of pulse and one the 4th umber of pulse of this first sub-signal, this second sub-signal, the 3rd sub-signal and the 4th sub-signal;
Difference according to this first umber of pulse and this second umber of pulse produces one first pulse difference, produces one second pulse difference according to the difference of the 3rd umber of pulse and the 4th umber of pulse; And
Determine the displacement of this object according to one of this first pulse difference at least and this second pulse difference.
2. the method for claim 1 wherein in the step that measures this displacement, on average decides this displacement according to first pulse difference and this second pulse difference.
3. the method for claim 1 wherein in the step of this displacement of decision, determines to adopt this first pulse difference or adopts this second pulse difference to decide this displacement according to a translational speed of this object.
4. the method for claim 1, wherein in this frequency conversion drive signal, the frequency of this first subconstiuent is lower than this second subconstiuent, when a translational speed of this object is slow, adopt this first pulse difference to decide this displacement, when this translational speed of this object is very fast, adopt this second pulse difference to decide this displacement.
5. the method for claim 1, wherein this frequency conversion drive signal comprises the subconstiuent of a plurality of different frequencies, in producing this frequency conversion clock pulse step, changes the frequency of described subconstiuent according to this translational speed of this object.
6. method as claimed in claim 5, wherein if this translational speed of this object is very fast, it is higher to make that then the average frequency of described subconstiuent of this frequency conversion drive signal is adjusted into, otherwise, then make the average frequency of described subconstiuent be adjusted into lower.
7. the device of the displacement of optical measurement one object comprises:
One driver element produces a frequency conversion drive signal, and this frequency conversion drive signal comprises first subconstiuent and second subconstiuent of different frequency, and this first subconstiuent and this second subconstiuent comprise that respectively an ascent stage reaches depression of order section;
One laser diode receives this frequency conversion drive signal to send a laser beam, and wherein, this laser beam is projeced into this object surfaces and reflects through it; And
One optical sensor, according to this laser pick-off one mixed-signal of reflection, wherein, corresponding to this ascent stage and this decline stage of this first subconstiuent, this mixed-signal has one first sub-signal and one second sub-signal;
Corresponding to this ascent stage and this decline stage of this second subconstiuent, this mixed-signal has one the 3rd sub-signal and one the 4th sub-signal;
This optical sensor and output correspond respectively to one first umber of pulse, one second umber of pulse, one the 3rd umber of pulse and one the 4th umber of pulse of this first sub-signal, this second sub-signal, the 3rd sub-signal and the 4th sub-signal;
Wherein, this driver element produces one first pulse difference according to the difference of this first umber of pulse and this second umber of pulse, produces one second pulse difference according to the difference of the 3rd umber of pulse and the 4th umber of pulse;
Wherein, this driver element determines the displacement of this object according to one of this first pulse difference and this second pulse difference at least.
8. method as claimed in claim 7, wherein this driver element on average decides this displacement according to first pulse difference and this second pulse difference.
9. method as claimed in claim 7, wherein this driver element determines to adopt this first pulse difference or adopts this second pulse difference to decide this displacement according to a translational speed of this object.
10. method as claimed in claim 7, wherein the frequency of this first subconstiuent is lower than this second subconstiuent, when a translational speed of this object is slow, this driver element adopts this first pulse difference to decide this displacement, when this translational speed of this object was very fast, this driver element adopted this second pulse difference to decide this displacement.
11. method as claimed in claim 7, wherein this frequency conversion drive signal comprises the subconstiuent of a plurality of different frequencies, and this driver element changes the frequency of described subconstiuent according to this translational speed of this object.
12. method as claimed in claim 11, wherein if this translational speed of this object is very fast, then to make that the average frequency of described subconstiuent of this frequency conversion drive signal is adjusted into higher for this driver element, otherwise, then make the average frequency of described subconstiuent be adjusted into lower.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510113201A CN100594472C (en) | 2005-10-12 | 2005-10-12 | Device and method of measuring body displacement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510113201A CN100594472C (en) | 2005-10-12 | 2005-10-12 | Device and method of measuring body displacement |
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| CN1949157A CN1949157A (en) | 2007-04-18 |
| CN100594472C true CN100594472C (en) | 2010-03-17 |
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| CN200510113201A Expired - Fee Related CN100594472C (en) | 2005-10-12 | 2005-10-12 | Device and method of measuring body displacement |
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