JPS58135402A - Ruggedness detector - Google Patents

Abstract

PURPOSE:To realize an automatic and highly precise detection for ruggedness on the surface of an object to be detected and to attain a reduction of labor, by attaching a piezoelectric element to a flexible supporter which is attached with an inclination to a contact which contacts with the flat surface of the object to be detected. CONSTITUTION:When a rugged part 51 on the surface of an object 5 to be detected is set right under a contact 1, a supporter 2 attached to the contact 1 with a prescribed angle has a flexion and displacement. Then an electric signal is produced from a piezoelectric element 3, and the output voltage is applied to an output device 7 via a lead wire 6. This output is applied to a waveform display part 73 via an amplifier 71 and a band pass filter 72. Thus a waveform is displayed. At the same time, the output given from the filter 72 is compared with the set voltage through a comparator 74. When said output is higher than the set voltage, a signal of defective ruggedness is applied to an alarm device 75 and a relay circuit 76 to produce an alarm. At the same time, a motor 77 is driven to eliminate automatically a defective object 5. This can save the labor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an unevenness detection device for detecting unevenness on a flat surface of an object to be detected.

Conventionally, in the case of products such as piezoelectric bimorphs that require high-precision flatness, the general method for detecting abnormal irregularities on the flat surface has been to rely on visual inspection by an inspector.

However, this method has the drawback that unevenness detection varies depending on the inspector, making it impossible to detect unevenness with high accuracy.Also, since such work requires precision, it requires a lot of manpower and effort, making it economically It also had extremely disadvantageous disadvantages.

This invention has been made to eliminate the above-mentioned drawbacks, and it is an object of the present invention to provide an economically advantageous unevenness detection device that can detect unevenness on a flat surface of a detected object with high precision, can save labor through automation, and is economically advantageous. With the goal.

An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is a contact, and this contact 1 has al.
The rod-shaped support body 2, which can be used as a lubricant, is attached at an angle of a predetermined angle R#. This support body 2 has a piezoelectric element 3 attached to a part of its side surface that directly converts the amount of layer displacement of the support body 2 into an electrical signal, and the piezoelectric bimorph part is formed by the bendable support body 2 and the piezoelectric element 3. I am trying to configure it. Further, the support 2 is sprayed onto the base 4. In such a configuration, the contact 1 is brought into contact with the flat surface of the object 5 to be detected. In this case, the object to be detected 5 is moved in the direction of the arrow shown in the figure starting from I4.

E Pressure distribution 4 Support body 2 and pressure 111c constituting the bimorph part
An output device 7 is connected to the element 3 via a lead wire 6. As shown in FIG. 2, this output device 7 includes an f pump 71.
Bandpass filter 72. Waveform display section 73. Comparator 74. Alarm device 75. It has a relay circuit 76 and a motor 77 for driving a defective product sorter.

Next, its effect will be explained.

First, the contactor 1 is brought into contact with the flat surface of the object to be detected 5, and in this state, the object to be detected 5 is moved in the direction of the arrow shown in the figure.

At this time, there is an uneven part 51 on the flat surface of the detected object 5, and when this uneven part 51;6'l comes directly under the contact 1, the contact 1 will move up and down depending on the size of the unevenness direction. As a result, the support 1 body 2, which is attached at an angle of a predetermined angle, is displaced, so that the piezoelectric bimorph part l constituted by this support body 2 and the piezoelectric element 3
ζ bending is applied, an electrical signal is generated by the piezoelectric effect, and an output voltage E is taken out through the lead 6. The output voltage E in this case is determined by the moving speed V of the detected object 5, the size d of the uneven portion 51, and the angle θ of the attachment of the support body 2 to the contactor 1. First, the relationship between the output voltage E and the moving speed V is determined when the mounting angle of the support 2 is 30° and 4
I investigated the case of 50.60' and found that Fig. 3 Im)
The results shown in (b) and (c) were obtained. (Such a characteristic diagram shows that the resonant frequency of the piezoelectric bimorph section composed of the support 2 and the piezoelectric element 3 is 10KH, and that the concavo-convex portion 51 has a large radius d.
The case where is 10011 m@degrees is shown. ) However,
From Fig. 3, the moving speed V of the detected object 5 is 1.0 m/se.
5. The highest output voltage E can be obtained when the voltage is around c.
found. Furthermore, it has been found that the relationship between the output voltage E and the size d of the uneven portion 51 is as shown in FIG. did.

The output voltage E thus obtained is applied to the output device 17 via the lead wire 6.

Then, first, the signal is amplified by the amplifier 714ζ, high frequency noise and power supply noise are removed via the band pass filter 72, and then applied to the waveform display 1s73 to be displayed as a waveform. In addition, the output from the bandpass filter 72 is output from the conhalator 7.
4, and is compared with a preset power supply voltage here. In this case, if a voltage value corresponding to the allowable unevenness is set as the set voltage, if the output from the band-pass filter 72 is larger than the set voltage, the comparator 74 will generate an output indicating untrue unevenness, and the alarm device 75 will The notification device 75 notifies the user that there are false irregularities. Also, the output of the comparator 74 is the relay circuit 76#
c is also provided, and is connected to the motor 77 via the same relay 76.
is J[moved. From this, the defective product sorting machine is driven and the abnormal uneven part 5! The object to be detected 5 having the following characteristics is forcibly removed.

Therefore, with this configuration, an output corresponding to the unevenness of the flat surface of the object to be detected can be obtained, and this output can accurately detect the unevenness, so that it is possible to detect the unevenness more accurately than the conventional visual inspection by inspectors. In comparison, highly accurate detection with no variation in detection results can be expected.

Moreover, since such unevenness detection can be performed automatically, it is possible to save labor and is extremely advantageous economically.

It should be noted that the present invention is not limited to the above-mentioned theoretical example, but can be modified to a solid line without changing the gist.

For example, in the above embodiment, the piezoelectric element 3 on the second support
Although the case has been described in which a plurality of piezoelectric elements 31 and 32 are attached, as shown in FIG. 5, a plurality of (two in the illustrated example) piezoelectric elements 31 and 32 may be bonded together. If it is thickened, a large output can be obtained for uneven parts. Further, as shown in FIG. 6, the piezoelectric element 3 may be attached over the entire length of the bendable support 2 to form a piezoelectric bimorph. In this way, the dimensions of the piezoelectric bimorph can be increased, and detection sensitivity can be improved. In FIG. 6, a wedge-shaped contact is used as the contact 1. Furthermore, in the above description, the structure is such that the support body 2 is attached to the base 4.

These may be of integral construction. Yet again. Although the detection object 5 is moved in C above, the contact 3111 may also be moved. In short, it is sufficient if relative movement can be obtained to detect the uneven portion.

As stated above, according to the present invention, the flat surface of the object to be detected [1]
4. It is possible to detect irregularities of $ with high accuracy and to save labor by automating such detection. It is possible to provide an economically advantageous unevenness detection device.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, and FIG.
The figure is a block diagram of the output device used in the same embodiment.
FIG. 5 is a schematic configuration diagram showing another solid line example of this invention, and FIG. 6 is a schematic configuration diagram showing another different embodiment of this invention. It is a diagram. l...Contactor 2...Support 3...Piezoelectric element 4...Base 5...Detected object 51
... Uneven part 6 ... Lead wire 7 ... Output device 71 ... Amplifier 72 ... Bandpass filter 73 ... Waveform display section 74 ... Comparator 75 ... Notification device 76.・Relay circuit 77・
...Drive motor Figure 1 11! Figure 2 WI31! lContinued from page 10 Inventor Takuko Tachikawa 2-43-2 Hatagaya, Shibuya-ku, Tokyo Lymphus Optical Co., Ltd. 0 Inventor Satsuki Kanbara 2-43-2 Hatagaya, Shibuya-ku, Tokyo Lymphus Optical Inventor Michio Nawa 2-43-2 Hatagaya, Shibuya-ku, Tokyo Inside Rinpus Optical Industry Co., Ltd.

Claims (1)

[Claims] A pressure 4 that generates an electrical output corresponding to the bending displacement t+
What is claimed is: 1. An unevenness detection device comprising: a piezoelectric element; and an output device to which an electrical output of the piezoelectric element is applied. +21 The unevenness detection device according to claim IEI, wherein the piezoelectric element is attached to a part of the support. +33): The unevenness detecting device according to claim 1, wherein the piezoelectric element is attached over the entire surface of the support with a difference of about 1%. (4) The output device described in E includes a waveform display unit that displays the waveform of the electrical output, a comparator that generates a comparison output between the electrical output and a preset setting value, and an alarm device that generates an alarm based on the output of this comparator. Claim 1, further comprising a drive unit for a device that removes an object to be detected having an abnormally uneven portion based on the output of the comparator.
□Irregularity detection device mounted on any one of the top to the third term'#cffi.