JPH0538515U - Optical displacement measuring device - Google Patents

Abstract

(57) [Abstract] [Purpose] The optical displacement measuring device enables the average value of distance measurement data to be set with a time element. [Structure] Light projecting section 10 for irradiating an object OB with light
1 and a light receiving section 1 for receiving the light reflected from the object OB.
A controller that is connected to the optical head A via a signal line C and that calculates the position detection signals I1 and I2 output from the optical head A and outputs distance measurement data. In combination with B, the controller B is set with a distance average value time setting for setting an average distance time for calculating an average value of distance measurement data obtained by repeatedly emitting light from the optical head A. It is configured to include a means 11 and a display section 10 for displaying the average distance time value set by the average distance measurement time setting means 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is an optical displacement measurement system capable of measuring the amount of displacement by detecting the optical signal reflected from the object by the position detection element when the object is irradiated with a light beam such as a laser beam. Regarding the improvement of the device.

[0002]

[Prior Art]

 As shown in FIG. 6, this type of optical displacement measuring device has a configuration in which an optical head 100 and a controller 200 are connected via a signal line 300, and the optical head 100 is provided with a light projecting section 101 and a light projecting section 101. The light receiving unit 102 is provided. The light projecting portion 101 of such an optical head 100 has a light projecting lens 100a, a laser light emitting element 100b, and a light projecting element drive circuit 100e built therein, and the other light receiving section 102 has a light receiving lens 100c and a light receiving element. The position detection element 100d and the I / V conversion circuit 100f for converting the position detection signals I1 and I2 output from the position detection element 100d in the form of current signals into the voltage signals V1 and V2 are incorporated.

In such a displacement measuring apparatus, an oscillation signal of a predetermined frequency output from the oscillator 202 in the controller 200 is sent to the optical head 100, and the light projecting section 101 of the optical head 100 modulates with this oscillation signal. The object OB is irradiated with a light beam such as the generated laser beam, and the reflected light reflected from the object OB is received and detected by the position detecting element 100d through the light receiving unit 102. At this time, from the position detecting element 100d. After the two output position detection signals I1 and I2 are converted into voltage signals V1 and V2 by the I / V converter 100f, they are taken into the signal processing circuit 201 in the controller 200 and are subjected to arithmetic processing to obtain optical signals. A configuration in which the displacement amount of the head 100 from a predetermined reference position is output as distance measurement data and can be displayed on the display unit 203 at the same time. However, the controller 200 outputs the average value of the distance measurement data through the output terminal in order to correct the variation in the measurement, and the user side is required to obtain the average value of the distance measurement data. The number of times of distance measurement performed in 1 is used as a measure of the average value, and it can be set in advance. When setting such an average value, the user selects and executes the average value setting mode from the normal distance measuring mode, and confirms the digital display displayed on the display unit 203 of the controller 200 while setting the setting key. It is customary to operate and set.

However, when the average value of distance measurement data is set by such a method, only digital information can be obtained on the user side, and time information for distance measurement can be obtained. There wasn't. Further, in such a displacement measuring device, when the moving average value is displayed on the display unit 203 of the controller 200 as the distance measurement data, the average value of the distance measurement data for which the distance measurement data newly measured is already calculated. In addition to the above, the average value of the whole is calculated. However, in such a case, when the optical head 100 or the object OB moves greatly during the distance measurement, the distance measurement data displayed on the display unit 203 becomes A response delay occurs until it is displayed following the movement of the head 100 or the object. In such a case, in the conventional optical displacement device that sets the average value number of times, the response delay to the display is delayed. There was also a problem such as not being able to grasp concretely.

[0005]

[Problems to be solved by the device]

 The present invention was made in view of the fact that the conventional optical displacement measuring device had the above-mentioned problems, and as a measure for obtaining the average value of the distance measuring data, the distance measuring interval is set. An optical displacement measuring device with a new structure that can be set with the distance measurement average value time that is the value obtained by multiplying the number of times of distance measurement, and at the time of setting, the average value time that should be set can be displayed and confirmed. It is intended to be provided.

[0006]

[Means for Solving the Problems]

 The optical displacement measuring device of the present invention, which is proposed to achieve the above object, includes a light projecting unit that irradiates an object with light, and a light receiving unit that receives light reflected by the object. An optical displacement that is configured by combining an optical head and a controller that is connected to this optical head via a signal line and that calculates the position detection signal output from the optical head and outputs distance measurement data. This is an improvement of the measuring device, in which the controller sets the time required to calculate the average value of the distance measurement data that is repeatedly measured by irradiating the optical head with light. And a display section for displaying the average value time set by the distance measurement average value time setting means.

[0007]

[Action]

 According to the optical displacement measuring device of the present invention, when setting the average value of the distance measurement data, the average value time with the time element as a scale is displayed on the display unit, and the desired value can be set while checking.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a front panel of a controller which is an essential part of the present invention, and FIG. 2 shows an external configuration of an optical displacement measuring device. As shown in these figures, the front panel 10A of the controller B is provided with the display section 10 and various setting keys 11a to 11d which constitute the distance measurement average value time setting means 11. On the display unit 10 composed of the display surface, 0.64 msec is displayed as the distance measurement average value time. Here, 11a and 11b are up / down keys for cyclically changing the distance measurement average value time displayed on the display unit 10, and 11c confirms the distance measurement average value time displayed on the display unit 10 for storage and setting. The enter key 11d is a selection key for the distance measurement average value time setting mode, and is labeled with [SPEED]. Also, 11g is a selection key in the distance measurement average number setting mode to which the [AVEAGE] character is added, and is operated when the number of distance measurement is set as a measure of the average value as in the conventional case.

Two LEDs 11e and 11f are provided on the right side of the digital display section of the display section 10. The distance measurement average value time setting mode selection key 11d is pressed to select the distance measurement average time setting mode. The upper LED 11e indicating the time [ms] as the unit of display is lit up, and the distance measurement average number setting mode selection key 11g is pressed, and when the distance average number setting mode is selected, the number of display units is changed. The lower LED 11f indicating [n] is turned on to clearly indicate the type of the average value scale displayed on the display unit 10. Here, the distance measurement average value time is defined as the value obtained by multiplying the distance measurement interval to by the number of times of distance measurement n that should take the average value, and the distance measurement interval performed by the displacement measuring device is to [sec]. If so, a value obtained by multiplying the distance measurement interval to by the number of times of distance measurement n, that is, to · n, is defined as the distance measurement average value time. Therefore, if the distance measurement interval is 20 μsec and only the power of 2 can be selected as the number of times of distance measurement, if the distance measurement average value time is defined, the number of times of distance measurement is 1, 2, 4, 8 , 16, 32, 64, 128, 256, 512, 1024, 2048, the average distance measurement time is 0.02, 0.04, 0.08, 0.16, 0.32, 0.64, 1. 28 2.56, 5.12, 10.24, 20.48, 40.96 (msec), which is set with a time factor.

FIG. 3 is a block diagram showing the internal structure of the optical displacement measuring device of the present invention, and FIG. 4 shows the details of the signal processing unit. As can be seen from FIG. 3, the optical head A has the same structure as the conventional device, and the controller B is provided with the signal processing unit 1 using a microcomputer. The oscillator 13 provided on the controller B side sends a modulation signal of a predetermined frequency to the light projecting unit 101 of the optical head A, and the laser light emitting element 100b is driven by this modulation signal. When the laser light modulated by the oscillation signal from the oscillator 13 is directed toward the object OB, the reflected light reflected from the object OB is detected by the light receiving unit 102 of the optical head A at this time. Position detection signals I1 and I2 are output from the position detection element 100d in the form of current signals, and the position detection signals I1 and I2 are further converted into voltage signals by the I / V converter 100f. Sent to 1. Then, in the signal processing unit 1, the distance measurement data is displayed on the display unit 10 after the arithmetic processing as described later is performed, and the distance measurement data is output from the signal output terminal. The input terminal block 12 is for connecting an external device when the optical head A and the controller B are remotely operated by the external device.

As shown in FIG. 4, the detailed configuration of the signal processing unit 1 is configured by using a microcomputer system, and includes a CPU 1a for performing signal processing and arithmetic processing required for control, The configuration includes an amplifier 1b, a detection circuit 1c, an A / D converter 1d, a memory 1e, a display unit 10 and a control input circuit 1f. The basic operation will be described. The position detection signals V1 and V2, which have been voltage-converted and output from the optical head A, are amplified to a predetermined level in the amplifier 1b and then oscillated from the oscillator 13 in the detection circuit 1c. When it is detected in synchronism with, the signal is converted into a digital signal by the A / D converter 1d, is taken into the CPU 1a, and is processed. That is, here, the following equation for correcting the non-linearity of the displacement amount Z with respect to the predetermined position is calculated to obtain the distance measurement data Z. Z = (V1-V2) / (V1 + kV2) Here, k is a coefficient selected for correcting the non-linearity of the displacement amount. In this way, the displacement amount Z calculated by the CPU 1a is displayed on the display unit 10 as distance measurement data, further converted into an analog signal by the D / A converter 1g, and then output to an external device through the output terminal TO. Is output.

Next, the operation procedure when setting the distance measurement average value time using the optical displacement measuring device of the present invention will be described more specifically. While the displacement measuring device is performing distance measurement, the moving average value of the distance measurement data is displayed on the display unit 10 every moment. At this time, when the distance measurement average value time setting mode selection key 11d is pressed, the lamp provided at the left corner of the key 11d lights up, and it is displayed that the distance measurement average value time setting mode has been entered. At this point, if the up / down keys 11a, 11b are operated (the display value is sequentially increased by operating 11a, the display value is sequentially decreased by operating 11b), each time the keys 11a, 11b are operated. In addition, since the average value time previously stored in the memory 1e of the signal processing unit 1 is sequentially and cyclically displayed on the display unit 10, at the time when the optimum distance measurement average value time is displayed on the display unit 10. When the enter key 11c is pressed, the displayed average value time is stored in the memory 1e, updated with the previously stored data, and set as a new distance measurement average value time. Steps 200 to 205 in FIG. 5 are flow charts showing the average value time setting procedure in this case.

[0013]

[Effect of the device]

 As can be understood from the above description, according to the optical displacement measuring device of the present invention, when obtaining the average value of the distance measurement data, it is possible to set the distance measurement average value time based on time, which is very convenient. However, if it is applied to the case where the moving average value is displayed on the display unit as distance measurement data, there is an advantage that the response delay of the display can be easily grasped.

[Brief description of drawings]

FIG. 1 is an external view of a front panel of a controller, which is a main part of an optical displacement measuring device of the present invention.

FIG. 2 is a perspective view showing an appearance of an optical displacement measuring device of the present invention.

FIG. 3 is a block diagram showing an internal configuration of an optical displacement measuring device of the present invention.

FIG. 4 is a block diagram showing an internal configuration of a signal processing unit.

FIG. 5 is a flowchart showing an operation procedure when setting a distance measurement average value time.

FIG. 6 is a block diagram showing a basic configuration of an optical displacement measuring device.

[Explanation of symbols]

 A ... Optical head B ... Controller C ... Signal line OB ... Object 10 ... Display 11 ... Distance measuring average value time setting means 11d ... Distance measuring average value time setting Mode selection key 101 ... Projector of optical head 102 ... Receiver of optical head

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Creator Yoshihiko Sugimoto 1048, Kadoma, Kadoma-shi, Osaka Matsushita Electric Works, Ltd.

Claims (1)

[Scope of utility model registration request] 1. A light projecting unit for irradiating an object with light,
Distance measurement data, which is connected to the optical head through a signal line and has a light-receiving unit that receives the light reflected from the object. In the optical displacement measuring device configured by combining with a controller for outputting the distance, the controller has a ranging average for calculating an average value of the ranging data repeatedly radiated from the optical head. An optical displacement measuring device comprising a value time setting means and a display section for displaying the distance measuring average value time set by the distance measuring average value time setting means.