CN100594472C - Device and method of measuring body displacement - Google Patents

Device and method of measuring body displacement Download PDF

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CN100594472C
CN100594472C CN 200510113201 CN200510113201A CN100594472C CN 100594472 C CN100594472 C CN 100594472C CN 200510113201 CN200510113201 CN 200510113201 CN 200510113201 A CN200510113201 A CN 200510113201A CN 100594472 C CN100594472 C CN 100594472C
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pulse
signal
difference
object
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CN1949157A (en
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廖炳谦
李建兴
马国栋
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达方电子股份有限公司
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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

测量物体的位移的装置及方法 A displacement measuring apparatus and method of the object

技术领域 FIELD

本发明涉及一种测量物体的位移的装置,特别是涉及一种利用激光测量物体的位移的装置。 The present invention relates to apparatus for measuring displacement of an object, in particular, it relates to an apparatus using a laser displacement measurement of an object.

背景技术 Background technique

市面上有很多利用光学特性以检测位移的输入装置,例如应用于计算机的光学鼠标。 There are many features to the input device using an optical detecting displacement, for example applied to an optical computer mouse. 光学鼠标底部有一光学传感器,在每隔一定时间撷取多个影像,并藉由处理器比较所撷取的影像图片的差异来决定鼠标的位移。 The optical mouse has a bottom optical sensor, capturing a plurality of images at regular intervals, and by differences in the image processor compares the captured image to determine the displacement of the mouse.

光学鼠标的普遍,是因为其准确度较佳于利用鼠标球(mouse ball)的机械式鼠标。 Common optical mouse, is preferred because of its accuracy in using a mouse ball (mouse ball) of the mechanical mouse. 另外,若应用于便携式电子产品中,例如PDA,使用者在移动中并无平坦表面以供光学鼠标运行,因此并不适用光学鼠标。 Further, when used in portable electronic products, such as PDA, a mobile user is not a flat surface for the optical mouse operation, and therefore does not apply to optical mouse.

飞利浦的美国专利US 6,707,027揭示了一种量测位移的输入装置,其利用激光的多普勒效应(Doppler shift)而检测手指的位移,所需的面积很小,适合用于可携式电子装置上。 Philips U.S. Patent US 6,707,027 discloses an input device sensing an amount of displacement, which uses a laser Doppler effect (Doppler shift) and detecting a displacement of a finger, a very small area required, suitable for portable electronic device on. 然而,在手指快速移动时,此种输入装置并无法精确的检测位移,使得坐标在屏幕看似反应迟钝而造成使用上的不便。 However, when the finger moves fast, such input means can not accurately detect a displacement and, in screen coordinates so that the reaction appears dull and inconvenient to use.

发明内容 SUMMARY

有鉴于此,本发明的目的是提供一种有效检测物体的快速及慢速移动以正确判定物体的位移。 In view of this, object of the present invention is to provide an efficient detection of fast and slow moving object is determined to correct the displacement of the object.

根据本发明的目的,提出一种测量物体位移的方法,产生变频驱动讯号以发出一激光束。 The object of the present invention, a method for measuring an object displacement, generating a variable frequency drive signal to emit a laser beam. 变频驱动讯号包括不同频率的第一子成分及第二子成分,其分别包括上升阶段及下降阶段。 Inverter drive signal comprising a first sub-component and a second different frequency sub-components, each including a rising phase and descent phase. 接着,投射激光束于一物体的表面并反射接收一混合讯号,其中,对应于第一子成分的上升与下降阶段,混合讯号具有第一与第二子讯号;对应于第二子成分的上升与下降阶段,混合讯号具有第三与第四子讯号。 Next, the laser beam is projected on the surface of an object and receiving a reflected signal mixing, which corresponds to the rise and fall phases of the first sub-component, the mixing signal having a first and a second sub-signal; corresponding to a rise of the second sub-component and the descent phase, mixed-signal having a third and fourth sub-signal. 接着,接收混合讯号,并输出分别对应于第一至第四子讯号的第一至第四脉冲数,并依据至少第一与第二脉冲数之差以及第三波与第四脉冲数之差之一而决定物体的位移。 Subsequently, receiving the mixed signal, and outputs respectively corresponding to the first to fourth number of pulses of the first to fourth sub-signals, and a difference according to the difference between the at least first and second operands and the number of pulses of the third wave and fourth pulse one of displacement of the object is determined.

根据本发明的目的,提出一种光学测量一物体的位移的装置,包括驱动单元、激光二极管及光传感器。 The object of the present invention, an apparatus is proposed an optical displacement measurement of an object, comprising a drive unit, a laser diode and a light sensor. 驱动单元产生一变频驱动讯号。 Generating a variable frequency drive unit driving signal. 变频驱动讯号包括不同频率的第一子成分及第二子成分,第一子成分及该第二子成分分别包括一上升阶段及一下降阶段。 Inverter drive signal comprising a first sub-component and a second different frequency sub-component, the first subcomponent and the second subcomponent comprises an ascending phase, respectively, and a descending phase. 激光二极管接收变频驱动讯号以发出一激光束,其中,激光束投射于该物体的表面并经其所反射。 Receiving frequency of the laser diode to emit a laser driving signal beam, wherein the laser beam is projected on the surface of the object and is reflected by it. 光传感器依据反射的该激光接收一混合讯号,其中,对应于第一子成分的上升阶段与下降阶段, 混合讯号具有一第一与一第二子讯号,对应于第二子成分的上升与下降阶段,混合讯号具有一第三与一第四子讯号,光传感器并输出分别对应于第一至第四子讯号的第一至第四脉冲数。 Light sensor receives a mixed signal according to the reflected laser beam, wherein, corresponding to the rise and fall phases of the first sub-phase component, the mixing signal having a first and a second sub-signal corresponding to the rise and fall of the second sub-component stage, mixing a first signal having a fourth pulse to the third and a fourth sub-signal, and outputs the optical sensor corresponding to the first to fourth sub-signals. 其中,驱动单元依据第一脉冲数与第二脉冲数之差产生第一脉冲差,依据第三脉冲数与第四脉冲数之差产生第二脉冲差,并由驱动单元依据至少第一与第二脉冲差之一而决定物体的位移。 Wherein the driving unit according to a first difference between the number of pulses of the second pulse generating a first pulse number difference, based on the difference between the number of third pulses to generate a fourth of the number of differential pulses of the second pulse, by the driving unit according to at least first and second one-pulse displacement of the object is determined difference.

为使本发明的上述目的、特征、和优点能更明显易懂,下文特举一较佳实施例,并结合附图详细il明如下。 For the above-described object of the present invention, features, and advantages can be more fully understood by referring cite a preferred embodiment, in conjunction with the accompanying drawings and the following detailed il out.

附图说明 BRIEF DESCRIPTION

图1示出了依照本发明较佳实施例的一种测量物体的位移的输入装置的方块图。 FIG 1 shows a block diagram of an input device for measuring the displacement of an object in accordance with the preferred embodiment of the present invention.

图2A示出了变频驱动讯号波形图。 FIG 2A illustrates a variable frequency drive signal waveforms. 图2B中示出了混合讯号的波形图。 FIG. 2B shows a waveform diagram of a mixed signal. 图3示出了混合讯号脉冲的波形图。 FIG 3 illustrates a waveform diagram of a mixed signal pulses.

图4示出了依照本发明的另一实施例的一种测量物体的位移的输入装置的方块图。 Figure 4 shows a block diagram of a displacement measuring object according to another embodiment of the present invention, the input device.

图5示出了依照本发明较佳实施例的一种测量物体的位移的方法的流程图。 FIG. 5 shows a flow chart of a method for measuring the displacement of an object according to a preferred embodiment of the present invention.

附图符号说明100、 400:输入装置110:驱动单元120:激光二极管130:光传感器 BRIEF DESCRIPTION OF REFERENCE NUMERALS 100, 400: input device 110: driving unit 120: laser diode 130: optical sensor

6410:变步14区动单元0bj:物体LB:激光束 6410: variable region of the movable unit 14 further 0bj: object an LB: laser beam

10、 12、 14、 22、 30、 32、 34:波形Pl、 P2:第一子成分、第二子成分Hl、 H2:上升阶段Ll、 L2:下降阶段 10, 12, 14, 22, 30, 32, 34: waveform Pl, P2: a first subcomponent, a second subcomponent Hl, H2: rising phase Ll, L2: descent phase

Rl、 R2、 R3、 R4:第一、第二、第三、第四子讯号Im:混合讯号Id:变频驱动-讯号 Rl, R2, R3, R4: a first, second, third, fourth sub-signal Im: mixed-signal Id: inverter drive - signal

具体实施方式 Detailed ways

飞利浦的美国专利US 6, 707, 027揭示的量测位移的输入装置,其使用固定频率的驱动讯号以驱动激光二极管,此方式仅适合检测特定的物体移动速度,当速度过快时会发生检测不准确的现象。 Philips U.S. Patent No. US 6, 707, 027 the input device disclosed in the measurement of displacement, which uses a fixed frequency drive signal to drive the laser diode, in this particular embodiment is only suitable for detecting speed of the object, when the detection will occur too fast inaccurate phenomenon.

请参照图1,其示出了依照本发明的一种测量物体的位移的输入装置的方块图。 Referring to FIG. 1, which shows a block diagram according to the input displacement means for measuring an object of the present invention. 输入装置100包括驱动单元110、激光二极管120及光传感器130。 The input device 100 includes a driving unit 110, laser diode 120 and the optical sensor 130. 驱动单元110产生一变频驱动讯号Id以驱动激光二极管120。 A variable frequency drive unit 110 generates drive signals to drive the laser diode 120 Id. 本实施例使用具有不同频率的驱动讯号Id以驱动激光二极管,因此当物体的速度快或慢时都可准确的检测。 The present embodiment uses the drive signals having different frequencies Id to drive the laser diode, and therefore can accurately detect when the speed of the object or slower. 图2A为变频驱动讯号Id波形图。 2A is a waveform diagram of a variable frequency drive signal Id. 标号1表示频率较快的子成份,标号2次之,标号3最慢。 Reference numeral 1 denotes a frequency faster subcomponents, followed by numeral 2, reference numeral 3 the slowest. 驱动讯号Id可以为波形10、 12或14 之一。 Id may be a drive signal waveform, or one of 141,012. 波形10具有交替为快、快、慢、慢(1、 1、 3、 3)频率的子成分; 波形12具有交替为慢、快、慢、快(3、 1、 3、 l)频率的子成分;波形14具有快、中、慢(l、 2、 3)频率的子成分。 Sub waveform 12 having alternating slow, fast, slow, fast (3, 1, 3, L) frequency; waveform 10 having alternately fast, fast, slow, slow (1, 1, 3, 3) subcomponent frequency components; waveform 14 with fast, medium and slow (l, 2, 3) the frequency sub-components. 以波形U为例,于2B图中所示, 变频驱动讯号Id包括较慢频率的第一子成分Pl及较快频率的第二子成分P2,第一子成分P1具有上升阶段H1及下降阶段Ll,第二子成分具有上升阶段H2及下降阶段L2。 Example U waveform, shown in FIG. 2B, a variable frequency drive comprises a first sub-component signal Id slower and faster frequency Pl second frequency sub-component P2, P1 of the first sub-component having a rising phase and descent phase H1 Ll, a second sub-component having a rising phase and descent phase H2 L2.

激光二极管120用以接收由驱动单元110所产生的变频驱动讯号Id,受其所驱动,并据以发出一激光束LB以传播至物体Obj,例如为使用者的手指。 A laser diode 120 for receiving the driving signal from the inverter drive unit Id generated by 110, by which it is driven, and accordingly to emit a laser beam LB to propagate to the Obj object, for example, a user's finger. 当激光束LB投射于物体Obj的表面时,经由反射,并以原激光束LB的传播路径传回,使得反射激光,与原有的激光LB自我混合(self-mixing),成为 When the laser beam LB projected on the surface of the object Obj via reflection and propagation paths to the original returned laser beam LB, so that the reflected laser light, the laser light LB with the original self-mixing (self-mixing), becomes

7一混合讯号Im。 7 a mixed-signal Im.

如第2B图中,混合讯号Im为波形22,具有一第一子讯号Rl与一第二子讯号R2,对应于第一子成分P1的上升阶段H1与下降阶段Ll,还具有一第三子讯号R3与一第四子讯号R4,对应于第二子成分P2的上升阶革爻H2与下降阶段L2。 As Figure 2B, the mixed signal Im is waveform 22, having a first sub-signal and a second sub-signal Rl R2, corresponding to the rise and fall phases H1 stage of the first sub-component P1 is Ll, ​​further comprising a third sub- a fourth sub-signal signal R3 with R4, corresponding to the rise of the second sub-component order of leather P2 and H2 Yao descent phase L2. 当物体0bj为静止不动时,第一子讯号Rl与第二子讯号R2 的波数为相等,而第三子讯号R3与第四子讯号R4的波数亦为相等。 When the object is stationary 0bj wave number of the first sub-signal and a second sub-signal Rl R2 are equal, and the third sub-signal and the fourth sub-signal R3 and R4 is also equal to the wave number.

当物体0bj朝向或远离激光束LB的方向移动时,反射光束经历多普勒效应,因而导致频移,使得混合讯号Im呈现图3波形上的讯号脉冲。 When the moving direction of the object 0bj toward or away from the laser beam LB, reflected beam undergoes a Doppler effect, resulting in a frequency shift, so that the mixed signal presented Im pulse signal waveform in Figure 3. 当混合讯号Im如波形32所示,其表示物体0bj往前移动(朝向激光束LB所行径的方向),混合讯号的子讯号Rl及R3的波数分别大于其子讯号R2及R4 的波数。 When the mixing signal Im as shown in waveform 32, which represents the object 0bj move forward (toward the direction of the laser beam LB acts), the wave number of the sub-signals mixed signals Rl and R3 are greater than the number of sub-wave signal R2 and R4. 而当物体0bj往后移动时(远离激光束LB所行径的方向),混合讯号lm将呈现如波形34,与物体0bj往前移动时相反的结果。 When moving object 0bj backward (direction away from the laser beam LB acts), the mixed-signal lm showed the opposite result as the waveform 34 is moved, and the object 0bj forward. 而脉冲数与物体的行径速度更有密切关系。 The number of pulses and the speed of the object acts more closely. 因此,在充分的利用两者之间的关系,便能由观察脉冲数得知物体0bj的行径速度快慢与方向。 Thus, the full use of the relationship between the two, acts rate of speed and direction of the object 0bj able to observe that the number of pulses.

藉由此,当光传感器130接收混合讯号Im后,即计算其频率以输出分别对应于第一子讯号Rl、第二子讯号R2、第三子讯号R3及第四子讯号R4 的第一脉冲数C1、第二脉冲数C2、第三脉冲数C3及第四脉冲数C4。 By this, when the light sensor 130 receiving the mixed signal Im, i.e., its frequency is calculated to output a signal corresponding to the first sub-Rl, the second sub-signal R2, signal R3, and third sub fourth sub-signal of a first pulse R4 number C1, the second number of pulse C2, a third and a fourth number of pulses of the pulse count C3 C4. 驱动单元110则依据第一脉沖数Cl与第二脉冲数C2之差计算而产生第一脉冲差Dl,并依据第三脉冲数C3与第四脉冲数C4之差计算而产生第二脉冲差D2。 Driving unit 110 generates a second difference between the first pulse based on a difference D2 pulses Cl and C2 of the second number of pulses of a first pulse generating Dl calculated difference, and the difference between the third pulse and the fourth pulse number C3 C4 number calculated on the basis of .

理论上,第一脉冲差Dl以及第二脉冲差D2应相同,不受驱动讯号Id 的频率变化所影响。 Theoretically, the difference between a first pulse and a second pulse difference Dl D2 should be the same, it is not affected by changes in the frequency of the drive signal Id. 然而,受到物体Obj的移动速度的影响而产生的误差, 使得第一脉冲差D1常不等于第二脉冲差D2。 Error, however, affected by the movement speed of the object Obj is generated, such that a first pulse D1 often not equal to the second difference difference pulse D2. 当物体Obj快速移动时,利用低频(较慢)的第一子成分P1,可能无法明显分辨上升周期与下降周期之间脉冲差D1。 When the object Obj is moving fast, low-frequency (slower) a first sub-component P1, a pulse may not be able to distinguish clearly the difference D1 between the rising period and falling period. 此时,便需通过较高频的第二子成分P2,来检测脉冲差D2。 In this case, it is required by the second sub-P2 higher frequency component to the difference between the detection pulse D2. 举例说明,当第一子成分P1的频率为1kHz时,对应的Rl及R2的第一脉冲数Cl及第二脉冲数C2例如分别为100与99,第二子成分P2的频率为10kHz 时,而对应的R3及R4的第三脉沖数C3及第四脉冲数C4为IO与4。 Way of example, when the first sub-component P1 frequency of 1kHz, Rl and R2 corresponding to the first pulse number and the second number of pulses Cl C2 respectively, for example when the frequency of 10kHz 100 99, P2 is the second sub-component, and the corresponding number of pulses of R3 and R4 of the third and the fourth pulse number C3 to C4 and IO 4. 因此, Dl等于100-99 = 1而D2等于10-4 = 6。 Thus, Dl and D2 = 1 is equal to 100-99 equals 10-4 = 6. 因此,相对于Dl,藉由D2可较清楚的得知于上升周期的第三脉冲数C3大于下升周期的第四脉冲数C4,代表物体的移动方向是往前。 Thus, with respect to Dl, D2 may be more apparent by that in the third pulse rising period is greater than the number of liters C3 fourth pulse cycle number C4, representative of the direction the object is moving forward. 也就是说,在物体Obj快速移动时,第二脉冲差D2 更能正确地表示物体的移动方向。 That is, when a fast moving object Obj, the second difference D2 pulse more accurately represents the direction of movement of the object. 另外,驱动单元110亦可依据第一脉冲差Dl与该第JU永冲差D2的平均来决定该移动方向。 Further, according to the first driving unit 110 may pulse the difference between Dl and second D2 JU permanent red difference in the average to determine the moving direction. 于此例中,第一^c冲差Dl 及第二脉冲差D2的平均值为15,因此,驱动单元110便可判定物体的移动方向是往前。 In this example, the first punch difference Dl ^ c and the second pulse D2 is the difference between an average value of 15, therefore, the drive unit 110 determines that the moving direction of the object can be forward.

也就是说,由不同频率的子成分,例如设定P1及P2的频率分别为lkHz 及100kHz,即可让P2有Pl—百倍的移动检测速率,达到4交高的分辨率,以更精确的检测到物体Obj极快速的移动。 That is, the sub-components of different frequencies, for example, P1 and P2 are set frequency lkHz and 100kHz respectively, to allow movement detection rate has Pl- P2 times, to achieve high resolution cross-4, in a more precise detecting an object moving very fast Obj. 因此,藉由物体0bj的移动速度, 处理器110便能依据至少第一脉冲差Dl与第二脉冲差D2之一决定物体0bj 的位移。 Thus, by the moving speed of the object 0bj, the processor 110 will be able to at least a first pulse based on the difference between Dl and D2, one difference between the displacement of the second pulse of determined object 0bj.

变频驱动讯号Id的形式除了图2A所示的波形10、 12、 14以外,尚可有其它种种的变化,或是使用两组激光二极管,分别以不同的频率驱动,仍可达到可以在不同物体移动速度中仍可准确判断方向的目的。 Id inverter drive signal in the form of waveform shown in Figure 2A except 10, 12, 14 was still various other changes, or using two laser diodes, each driven at different frequencies, can reach the object may be in different object can still accurately determine the direction of the moving speed.

请参照图4,其示出了依照本发明一较佳实施例的一种光学测量一物体的位移的输入装置400的方块图。 Referring to Figure 4, which shows a block diagram of a measuring displacement of an object in accordance with a preferred embodiment of an optical embodiment of the present invention, the input device 400. 输入装置400包括变频驱动单元410、激光二极管120及光传感器130。 The input device 400 includes a variable frequency drive unit 410, a laser diode 120 and the optical sensor 130. 变频驱动单元410用以产生变频驱动讯号Id 以驱动激光二极管120发出激光束LB,并以光传感器130接收的反射的混合讯号Im。 Frequency inverter driving unit 410 for generating a drive signal Id to drive the laser diode emits a laser beam LB 120, and mixed signal Im to the photosensor 130 receives reflected. 变频驱动单元410还具有时序控制、回授控制及数据处理等功能。 Variable frequency drive unit 410 further includes a timing control, feedback control and data processing capabilities. 变频驱动讯号Id包括多个不同频率的子成分,如第一子成分P1及第二子成分P2,藉由驱动单元110依据物体Obj的移动速度而改变其频率。 Id inverter drive signal comprising a plurality of sub-components of different frequencies, as in the first subcomponent and the second subcomponent P1 P2, by the driving unit 110 according to the moving speed of the object Obj change its frequency. 当物体Obj的移动速度较快时,驱动单元110更可用以使得变频驱动讯号的子成分的平均频率调整为较高,反之,则使得子成分的平均频率调整为较低。 When the moving speed of the object Obj faster, more may be used to drive unit 110 so that the average frequency of the inverter drive signal is adjusted to a higher sub-components, and vice versa, so that the average frequency is adjusted to a lower sub-components.

请参照图5,其示出了依照本发明较佳实施例的一种测量物体的位移的方法的流程图。 Referring to FIG 5, which illustrates a flowchart of a method for measuring the displacement of an object according to a preferred embodiment of the present invention. 本实施例的方法始于步骤510,产生变频驱动讯号Id以驱动激光二极管120,以发出激光束LB。 The method of the present embodiment starts in step 510, a variable frequency drive signal generating Id to drive the laser diode 120 to emit a laser beam LB. 接着,于步骤520中,投射激光束于物体Obj的表面并经其所反射,产生反射光。 Next, in step 520, the laser beam to the projection surface and by its object Obj reflected, reflected light is generated. 然后,于步骤530中,依据反射光与激光LB的激光自混(self-mixing),而接收混合讯号Ira。 Then, in step 530, based on the reflected laser light from the laser beam LB and mixed (self-mixing), mixed-signal receiving Ira. 接着,于步骤540中,利用光传感器130接收混合讯号Iffl,并输出分别对应于第一子讯号Rl、第二子讯号R2、第三子讯号R3及第四子讯号R4的第一脉冲数C1、第二脉冲数C2、第三脉冲数C3及第四脉冲数C4。 Next, in step 540, 130 received by the optical sensor Iffl mixed signal, and outputs a signal corresponding to the first sub-Rl, the second sub-signal R2, signal R3, and third sub fourth sub-signal a first number of pulses of the C1 R4 , the second number of pulse C2, a third and a fourth number of pulses of the pulse count C3 C4. 接着,于步骤"0中,依据第一脉冲数C1与第二脉冲数C2之差产生第一脉冲差Dl,并依据第三脉冲数C2与第四脉沖数C4之差产生第二脉冲差D2。接着,于步骤560中,依据至少第一脉沖差D1与第二脉沖差D2之一而决定物体Obj的位移。 Next, at step "0, a first pulse is generated based on the difference between a first difference Dl C1 and the second number of pulses of the pulse number C2, D2 and generates a second differential pulse number based on the difference between the third pulse and the fourth pulse count C2 of C4 Next, at step 560, at least one of a first pulse according to a difference D1 and the second difference D2 is determined displacement pulse object Obj.

9因此,利用本发明上述实施例所披露的光学测量一物体的位移的方法及 Method 9 Thus, with the above-described embodiments of the invention disclosed in the optical measuring a displacement of an object and

装置实施例,当物体移动得很快时,便可由较高频率的P2及第二脉冲差D2 来决定位移,而当物体移动得缓慢时,便可由较低频率的Pl及第一脉冲差Dl来决定位移,以弥补传统利用固定频率,只能检测特定范围的变化,而无法检测快速或緩慢移动的缺点。 Apparatus embodiment, when an object moves quickly, P2 can be determined by the displacement of the higher frequency pulse and the second difference D2, and when the object moves slowly, Pl can be made lower frequency and a first pulse difference Dl to determine the displacement, to make use of a conventional fixed frequency, can only detect a change in a specific range, it can not be detected rapidly or slowly moving disadvantages. 针对可携式电子装置,各可有效检测使用者手指的移动,以判断正确的坐标位置。 For portable electronic device, the user can effectively detect movement of each finger, to determine the correct coordinate position.

综上所述,虽然本发明已以一较佳实施例披露如上,然其并非用以限定本发明,本领域的技术人员在不脱离本发明的精神和范围的前提下可作各种的更动与润饰,因此本发明的保护范围以本发明的权利要求为准。 Although the present invention has been disclosed above with reference to a preferred embodiment of embodiment, they are not intended to limit the invention, those skilled in the art without departing from the spirit and scope of the present invention can be variously more moving and alterations, and therefore the scope of the present invention is subject to the requirements of the present invention as claimed.

Claims (12)

1.一种测量一物体位移的方法,包括: 产生一变频驱动讯号以驱动一激光二极管,以发出一激光束,该变频驱动讯号包括不同频率的第一子成分及第二子成分,该第一子成分及该第二子成分分别包括一上升阶段及一下降阶段; 投射该激光束于该物体的表面并经其所反射; 依据反射的该激光接收一混合讯号,其中,对应于该第一子成分的该上升阶段与该下降阶段,该混合讯号具有一第一子讯号与一第二子讯号; 对应于该第二子成分的该上升阶段与该下降阶段,该混合讯号具有一第三子讯号与一第四子讯号; 利用一光传感器接收该混合讯号,并输出分别对应于该第一子讯号、该第二子讯号、该第三子讯号及该第四子讯号的一第一脉冲数、一第二脉冲数、一第三脉冲数及一第四脉冲数; 依据该第一脉冲数与该第二脉冲数之差产生一第一脉冲差,依据 A method for measuring the displacement of an object, comprising: generating an inverter driving signal for driving a laser diode to emit a laser beam, the drive signal includes a first frequency sub-components of different frequencies and a second sub-component, the second a sub-sub-component and the second component each comprise a rising phase and a descending phase; projecting the laser beam on the surface of the object and by which it is reflected; receiving a mixed signal according to the reflected laser beam, which corresponds to the second the rising phase of a sub-component of the descent phase, mixing the sub-signal having a first signal and a second sub-signal; corresponding to the second sub-component of the rising phase of the descent phase, the mixing signal having a first three sub-signal and a fourth sub-signal; using a photosensor receiving the mixed signal, and outputs respectively corresponding to the first sub-signal, the second sub-signal, a second signal and the third sub-signal of the fourth sub a pulse number, a second number of pulses, the number of a third pulse and a fourth pulse number; generating a difference between the first pulse and the difference between the second number of the first pulse according to the pulse number, based on 第三脉冲数与该第四脉冲数之差产生一第二脉冲差;以及依据至少该第一脉冲差与该第二脉冲差之一而决定该物体的位移。 Generating a third number of pulses of the second pulse of the difference between the number of pulses of the fourth difference; and based on at least the difference between the first pulse and the second pulse one differential displacement of the object is determined.
2. 如权利要求1所述的方法,其中在量测该位移的步骤中,依据第一脉冲差与该第二脉冲差的平均来决定该位移。 2. The method according to claim 1, wherein the step of measuring the displacement according to the average difference between a first pulse of the second pulse to determine the difference in displacement.
3. 如权利要求1所述的方法,其中在决定该位移的步骤中,依据该物体的一移动速度而决定采用该第一脉冲差或采用该第二脉冲差来决定该位移。 3. The method according to claim 1, wherein the step of determining the displacement in accordance with a moving speed of the object is determined using the difference of the first pulse or the second pulse using the difference to determine the displacement.
4. 如权利要求1所述的方法,其中在该变频驱动讯号中,该第一子成分的频率低于该第二子成分,当该物体的一移动速度较慢时,采用该第一脉冲差来决定该位移,当该物体的该移动速度较快时,采用该第二脉沖差来决定该位移。 4. The method according to claim 1, wherein the variable frequency drive signal, the frequency of the first sub-component is lower than the second sub-component, when a slow moving speed of the object, using the first pulse determining the difference of displacement, when the moving speed of the object is fast, using the second pulse to determine the displacement difference.
5. 如权利要求1所述的方法,其中该变频驱动讯号包括多个不同频率的子成分,在产生该变频时脉步骤中,依据该物体的该移动速度而改变所述子成分的频率。 5. The method according to claim 1, wherein the drive signal comprises a plurality of sub-frequency components of different frequencies, when generating the pulse frequency step, according to the moving speed of the object and changing the frequency of the sub-component.
6. 如权利要求5所述的方法,其中若该物体的该移动速度较快,则使得该变频驱动讯号的所述子成分的平均频率调整为较高,反之,则使得所述子成分的平均频率调整为较低。 6. The method according to claim 5, wherein if the moving speed of the object is fast, so that the frequency is the average frequency of the driving signal is adjusted to a higher sub-components, and vice versa, so that the said sub-component adjusted to a lower average frequency.
7. —种光学测量一物体的位移的装置,包括:一驱动单元,产生一变频驱动讯号,该变频驱动讯号包括不同频率的第一子成分及第二子成分,该第一子成分及该第二子成分分别包括一上升阶段及一下降阶段;一激光二极管,接收该变频驱动讯号以发出一激光束,其中,该激光束投射于该物体的表面并经其所反射;以及一光传感器,依据反射的该激光接收一混合讯号,其中,对应于该第一子成分的该上升阶段与该下降阶段,该混合讯号具有一第一子讯号与一第二子讯号;对应于该第二子成分的该上升阶段与该下降阶段,该混合讯号具有一第三子讯号与一第四子讯号;该光传感器并输出分别对应于该第一子讯号、该第二子讯号、该第三子讯号及该第四子讯号的一第一脉冲数、 一第二脉冲数、 一第三脉冲数及一第四脉沖数;其中,该驱动单元依据该第 7. - such an optical displacement measuring apparatus of an object, comprising: a driving unit generating a variable frequency drive signal, the drive signal includes a first frequency sub-components of different frequencies and a second sub-component, the first subcomponent and the the second sub-component, respectively, comprising a rising phase and a descending phase; a laser diode, for receiving the driving signal frequency to emit a laser beam, wherein the laser beam is projected on the surface of the object and reflected by it; and a light sensor , according to the reflected laser receives a mixed signal, wherein the first sub-component corresponding to the rising phase of the descent phase, mixing the sub-signal having a first signal and a second sub-signal; corresponding to the second the rising phase sub-component and the descent phase, the mixing signal having a third sub-signal and a fourth sub-signal; and outputting the optical sensor corresponding to the first sub-signal, respectively, the second sub-signal, the third a first pulse signal and the number of the fourth sub-sub-signals, a second pulse number, the number of a third pulse and a fourth pulse number; wherein the driving unit according to the second 脉冲数与该第二脉冲数之差产生一第一脉沖差,依据该第三脉冲数与该第四脉沖数之差产生一第二脉冲差;其中,该驱动单元依据至少该第一脉冲差与该第二脉冲差之一而决定该物体的位移。 Generating the difference between the number of pulses of the pulse number of a second difference between a first pulse, the third number of pulses to generate a second pulse according to the difference between the number of pulses of the fourth difference; wherein the driving unit according to at least a first pulse of the difference one difference with the second pulse of the displacement of the object is determined.
8. 如权利要求7所述的方法,其中该驱动单元依据第一脉冲差与该第二脉冲差的平均来决定该位移。 8. The method according to claim 7, wherein the driving unit based on a difference between a first pulse of the second pulse to determine an average difference of the displacement.
9. 如权利要求7所述的方法,其中该驱动单元依据该物体的一移动速度而决定采用该第一脉冲差或采用该第二脉冲差来决定该位移。 9. The method according to claim 7, wherein the driving unit according to a moving speed of the object is determined using the difference of the first pulse or the second pulse using the difference to determine the displacement.
10. 如权利要求7所述的方法,其中该第一子成分的频率低于该第二子成分,当该物体的一移动速度较慢时,该驱动单元采用该第一脉冲差来决定该位移,当该物体的该移动速度较快时,该驱动单元采用该第二脉沖差来决定该位移。 10 to determine the method of claim 7, wherein a frequency of the first sub-component is lower than the second sub-component, when a moving speed of the object is slow, the pulse driving unit using the first difference displacement, when the moving speed of the object is fast, the pulse driving unit using the second difference to determine the displacement.
11. 如权利要求7所述的方法,其中该变频驱动讯号包括多个不同频率的子成分,该驱动单元依据该物体的该移动速度而改变所述子成分的频率。 11. The method according to claim 7, wherein the inverter drive signal comprising a plurality of different frequency sub-components of the driving unit according to the moving speed of the object changes the frequency of the sub-component.
12. 如权利要求11所述的方法,其中若该物体的该移动速度较快,则该驱动单元使得该变频驱动讯号的所述子成分的平均频率调整为较高,反之,则使得所述子成分的平均频率调整为较低。 The average frequency of the sub-component 12. The method of claim 11, wherein if the moving speed of the object is fast, the drive unit so that the inverter drive signal is adjusted to be higher, on the contrary, is such that the the average frequency is adjusted to a lower sub-components.
CN 200510113201 2005-10-12 2005-10-12 Device and method of measuring body displacement CN100594472C (en)

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