JPS631901A - Detection method and apparatus therefor - Google Patents

Abstract

PURPOSE:To obtain high output voltage, by a simple constitution such that the displacement of a contact part is detected on the basis of voltage generated in a piezoelectric element with the deformation of an elastic plate generated by the displacement of the contact part. CONSTITUTION:The detection parts 4 of a detection apparatus have a bimorph structure and measuring rollers 3b being contact parts are mounted to one ends thereof and through-holes permitting the piercing of a support bolt 8 being a mount part are provided to the other ends thereof. The measuring rollers 3b of the detection parts 4 are set at an interval W in such a state that the bolt 8 pierces through the through-holes to be positioned and clamped from both sides by nuts 9 to be fixed. When an article to be measured is inserted between the measuring rollers 3b, said article appears in spring steel plates 4d as strain corresponding to the width wider than the interval between the measuring rollers 3b to generate voltage in the piezoelectric element (support bolt) 8. This voltage is read by a voltmeter through a lead wires and the displacement between the measuring rollers 3b of the detection part 4 can be calculated from the voltage value being read.

Description

[Detailed Description of the Invention] Bullets generated by t! 1? Detecting the displacement of the contact part by one electric current generated in the F1-electric element due to the deformation of the L body? Signs I and 4 detection methods.

(2) A detection part having a contact part at one end of the elastic plate on which the piezoelectric element is pasted and the other end fixed to the part, and the piezoelectric element r
A detection device is characterized in that it is equipped with a detector that detects the voltage generated at the source.

(3) Two detection parts with a contact part on one end of the plate with piezoelectric elements attached, and the distance between the contact parts can be set at the other end of each detection part. The mounting part to be fixed to the
1. A detection neck device characterized by comprising: a detection means for detecting an error in a set value of the interval between the contact portions from a voltage value generated at the completion of the piezoelectric actuation.

3. Detailed Description of the Invention (Object of the Invention) (Industrial Application Field) The present invention 1.L relates to a detection method and apparatus suitable for measuring the coefficient of an article.

(Prior art) In recent years, automation of the production line represented by ``Δ'' has been progressing.
At this time, in order to automatically control the cutting material, a number of...
- Detection sensor (sensor) that detects position, etc. is important 4F
playing a role. Conventionally, there are sensors used in such places, such as temperature sensors, proximity sensors, and photoelectric sensors. [
It is described in detail in Rensa Practical Handbook J, etc.

(The invention solved the problem) However, since f, the output signals of such sensors b) are difficult to solve.

Therefore, it is an object of the present invention to provide a detection method that can obtain a high output voltage signal by utilizing the L1 electric element, and a /j detection device using this detection method.

[Structure of the Invention] (Means for Solving the Problems) That is, the present invention provides an elastic plate in which an 11-electrode element is pasted on one or both sides of an elastic plate, and the - end is provided with a contact portion to form an open end, and the other end is provided with an open end. (= A method in which the displacement of the contact part is detected by the voltage generated in the piezoelectric element due to the deformation of the elastic plate caused by the displacement of the contact part, and the voltage is generated in the piezoelectric element.) The present invention is characterized by a detection device that can count the number of times the contact portion is displaced by 171, and a detection device that can measure the magnitude of the displacement of the contact portion based on the magnitude of the voltage induced in the piezoelectric element.

(For fl) The object to be detected contacts and presses the contact part, displacing the contact part.
This causes the elastic plate to curve. As the elastic plate bends, the piezoelectric element also bends, causing internal strain and generating voltage. Since this voltage provides a large output voltage for a small displacement, a complicated circuit such as an amplifier circuit is not required. From this, the number of displacements of the contact portion can be easily determined by counting the voltage generated in the low electric element. Also, since the electric current ff Lj generated in the piezoelectric element is proportional to the displacement of the contact part, this electric current B-
By detecting the magnitude of the value, the displacement of the contact portion can be detected.

(Example) The detection method of the present invention will be explained below with reference to FIG. The same figure (an example in which a bimorph structure is applied in which a C spring steel plate 4a is used as an elastic plate, and piezoelectric elements 4b are attached to both sides with a conductive adhesive so that both outer sides have opposite polarization. There is a contact portion 3 at this one open end 4a+.
, and the other end (fixed G & 1N4a2 attachment is fixed to part 7).

Reference numeral 6 is a one-tone wire for transmitting the voltage generated in the piezoelectric element 4b, and is connected according to the polarity of the voltage generated when the spring steel plate 4a is displaced in one direction.

When a force F is applied to the contact portion 3 in the configuration in which the force F is reached, the spring steel plate 4b is displaced by an amount δ in response to the force F. Since mechanical bending strain is applied to the piezoelectric element 8 due to the displacement of the spring steel plate, a voltage is generated in the piezoelectric element. As an example of this generated voltage is shown in Fig. 2, a large voltage is obtained for a small displacement δ, and this voltage value is proportional to the displacement δ. It is valid as a law.

Next, Fig. 3 and 5 show the detection device using this method.
This will be explained with reference to FIGS.

FIGS. 3 and 4 show a first embodiment of a detection device for measuring the number of times a voltage is generated across a piezoelectric element by the number tj.

In the figure, reference numeral 1 denotes a chute, which is inclined so that the conveyed object 2 slides in the direction of the arrow in the figure. 4 is a detection part, which has a bimorph structure in which piezoelectric elements 4b are attached to both sides of a spring steel plate 4a with a conductive adhesive so that both outer sides have opposite polarization, and a contact part is provided at the open end of the piezoelectric element 4b. Touch! 13, and the fixed end is fixed to the mounting base (mounted at part > 7a). 5 is a counter that does not require an external power supply and has a display window 5a, which reads the voltage generated in the piezoelectric element 4b of the detection section 4. It is received through the line 6 to the input terminal 5b and counts the number of times the voltage is generated.

Now, when the conveyed object 2 slides on the chute 1 in the direction of arrow Ab and touches the stylus 3, the bimorph structure detecting section 4 is pushed by the conveyed object 2 and curves, and a voltage value corresponding to the displacement caused by this curvature is detected. This occurs in the piezoelectric element 4b. This voltage is applied to the input @5b of the counter 5 via the lead wire 6, and a counting operation is performed by this voltage.

Figure 4 is a photograph of the voltage value generated in the Lumi element recorded on an oscilloscope.1 In this figure, the conveyed object 2 is slid at predetermined time intervals, and the first conveyed object is the stylus. The time when the second conveyed object touched the stylus is 82, and the time when the third conveyed object touched the stylus is a3. As is clear from this photograph, by operating the counter 5 using these generated voltages, it is possible to count the number of objects to be transported.

FIG. 5 shows the device of the first embodiment shown in FIG. 3 integrally formed, and 4C indicates a protective cover. With this structure, there is no need to worry about external power supply, etc., and the installation space is small. In the first embodiment, the wiring of the power supply is not required.
number is possible.

Next, a second embodiment will be explained with reference to FIG.

The figure shows an example of a detection device that detects an increase width from a certain set width. In the figure - C41, there are two detection parts,
Piezoelectric elements are pasted on both sides of the spring steel plate 4d to form a four-way bar structure, with a contact part j and two measurement points 1-1 and 3d at the other end, and a The through hole that passes through the mounting part holder port 1-8 is modest.

With the pole [・8 passing through this hole, position the detection part 4 at the measurement interval W between the measurement [] and the pole 3 [), and then push the
・Fix it by tightening it from both sides with 9. 6 is the lead wire that transmits the voltage generated in jT element f. When inserted, the width is wider than the interval between the measuring rollers 3b (J spring steel plate 4d is distorted and the piezoelectric element 8 (J voltage is generated 1).
-Zuru. This voltage is read through the lead wire 6 by an electric wire 15 (not shown), and from this voltage it is possible to determine the change (v) between measurement 1 and 3b of the detection section 4.

In addition, in automation - unattended management of the culm, when the distance between the measuring rollers is widened to a certain maximum allowable width, the electric current generated in the IJFf electric element is set and C is set, and an electric current exceeding this predetermined value is generated. If it is allowed to grow, it can also be used to eliminate defects by eliminating it after one culm.

[Effects of the Invention] As explained above, according to the present invention, a contact portion is provided at one end of an elastic plate on which a piezoelectric element is pasted, and the other end is fixed to the A high output voltage can be obtained as a detection signal with a simple configuration by detecting the displacement of the contact portion where the voltage generated in the piezoelectric element rises due to the deformation of the elastic plate caused by contact with the piezoelectric element.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the detection method of the present invention, and Fig. 2 shows the displacement of the contact portion and the Ql+8? . 3 are perspective views illustrating the outline of the first embodiment of the detection system of the present invention, and FIG. [1 photograph, Fig. 5 is a perspective view showing an example in which the first embodiment of the present invention is integrated, and Fig. 6 is a perspective view of main parts of the second embodiment of the present invention. 3.・Contact part, 4...Detection part, 4a...Spring steel plate (elastic modulus), 4b...Piezoelectric element, 5...Counter, 6...Lead wire, 7...Mounting part. Substitute ``Patent Attorney'' Noriyuki Chika Hirofumi Mimata -〇- Figure 6 (V) Time -→ Figure 4 Figure 6

Claims (3)

[Claims] (1) A contact part is provided at one end of an elastic plate to which a piezoelectric element is attached, and the other end is fixed to a mounting part, and contact is made by the voltage generated in the piezoelectric element as a result of the deformation of the elastic plate caused by the displacement of the contact part. A detection method characterized by detecting displacement of a portion. (2) Detection characterized by comprising a detection unit having a contact part at one end of an elastic plate to which a piezoelectric element is attached and the other end fixed to a mounting part, and a counter for counting the voltage generated in the piezoelectric element. Device. (3) two detection parts each having a contact part at one end of an elastic plate to which a piezoelectric element is attached; a mounting part for fixing the other end of each detection part so that the interval between the contact parts can be set; A detection device comprising: a detection means for detecting an error between a voltage value generated in the element and a set value of the distance between the contact portions.