CN1237702A - Inspection device and inspection method of rotary operation type electronic component - Google Patents

Abstract

An inspection device and inspection method for a rotary operation type electronic component, wherein a mounting plate is mounted on a mounted portion of an electronic component with a gap in a direction perpendicular to a rotation axis. Hold the swivel shaft connection on the collet. By rotating the drum rotatably accommodating the chuck, an arm protruding from the outer circumference of the drum is pushed at the free end of a plate attached with a strain gauge and one end is fixed to the outer circumference of the drum to rotate the axis of rotation, and the The resistance value of the sheet changes to detect the rotation load acting on the rotation shaft, and the invention can reliably determine the rotation load quickly and with small errors.

Description

Inspection device and inspection method of rotary operation type electronic component

The present invention relates to an inspection device and inspection method for rotary-operated electronic components such as switches, variable resistors, and encoders used in various electronic equipment.

In recent years, in the process of high-functioning and diversifying electronic equipment such as communication equipment, imaging equipment, and audio equipment, rotary-operated electronic components such as switches, variable resistors, and encoders (hereinafter referred to as Components) also use devices and methods with various operating forms and operating feelings.

A conventional inspection device and inspection method for such components will be described with reference to FIGS. 5 to 8 . FIG. 5 is a cross-sectional view schematically showing a conventional inspection device, and FIG. 6 is an exploded perspective view of FIG. 5 .

In both figures, the element 100 has an axis of rotation 121 by which the element 100 is operated by rotating it. In addition, the element 100 has mounting holes 123 and 125 serving as mounted portions on the left and right of the shaft 121 .

The inspection device of the component 100 has the following structure.

The mounting plate 200 has a through hole 131 in the center. In addition, protruding pins 133 and 135 are provided on the left and right sides of the hole 131 on the upper surface of the plate 200 . The pins 133 and 135 are inserted into the holes 123 and 125 while the shaft 121 passes through the hole 131 . In this way, the component 100 to be inspected is mounted on the mounting plate 200 which is a part of the inspection device.

The upper part of the collet 300 is connected with the holding shaft 121 . A coil spring-shaped universal joint 500 is attached between the lower end of the chuck 300 and the upper end of the drum 400 . A torque gauge 600 for detecting a rotational load is fixed to the lower end of the drum 400 . The torque meter 600 is electrically connected to an inspection circuit (not shown) by wires.

In the conventional inspection device described above, when the torque gauge 600 is rotated, the drum 400 rotates therewith. The rotation of the drum 400 is then transmitted through the joint 500 to the chuck 300 which rotates the shaft 121 . At this time, the torque meter 600 detects the rotational load transmitted to the shaft 121 of the torque meter 600 through the chuck 300 , the joint 500 , and the drum 400 . Its detection signal is sent to the inspection circuit. The inspection circuit detects the rotational load from the detection signal, compares its value with a preset reference value, and determines whether the rotational load is satisfactorily within the reference value.

However, in the conventional inspection device having the above-mentioned structure, as shown in FIG. Therefore, in practice, some degree of displacement occurs between the axial center of the shaft 121 and the axial centers of the drum 400 and the torque gauge 600 . In this case, the collet 300 can be connected to the holding shaft 121 by the flexure of the joint 500 despite the eccentricity between the two.

However, in the above-mentioned conventional inspection device and inspection method, since the axial center of the shaft 121 and chuck 300 and the axial center of the drum 400 and the torque meter 600 become eccentric, the inspection , so there is an error in the test result. The situation will now be described with reference to Fig. 8A and Fig. 8B. The horizontal axis represents the rotation angle of the shaft 121 , and the vertical axis represents the rotational load acting on the shaft 121 . When the inspection is performed in a state where the above-mentioned eccentricity occurs, in fact, the detection becomes a waveform with fluctuations as shown in FIG. 8B as a whole with respect to the rotational load having the waveform as shown in FIG. 8A . Therefore, there is a possibility that a large error may occur in the judgment of good or bad by the inspection circuit.

In addition, since the joint 500 is interposed between the collet 300 and the drum 400 , inertia is generated on the collet 300 relative to the torque gauge 600 and the drum 400 when rotating. This inertia increases as the torque meter 600 is rotated rapidly, and as a result, the fluctuation of the waveform of the rotating load increases. Therefore, in order to suppress the above-mentioned inertia, it is necessary to rotate the torque meter 600 slowly to some extent for inspection, and there is a problem that the inspection takes time.

In order to solve the above problems, an object of the present invention is to provide an inspection device and inspection method for a rotary operation type electronic component that reliably detects a rotational load acting on a rotating shaft, quickly and with less error.

To achieve the above object, the inspection device of the present invention has the following structure.

It includes: a mounting plate for installing a rotary-operated electronic component with a rotating shaft and a mounted part on the mounted part with a gap in a direction perpendicular to the rotating shaft; a chuck for connecting and holding the rotating shaft; Rotating cylinder on which chucks are freely rotatable; elastic plate with one end fixed to the outer circumference of the drum to which strain gauges are attached; arm protruding from the outer circumference of the chuck and abutting against the free end of the plate; inspection of connection with strain gauges circuit.

In addition, the inspection method of the present invention is to install the mounting plate on the mounted part provided on the component with a gap in the direction perpendicular to the rotating shaft, connect and maintain the rotating shaft on the chuck, and rotate freely The drum with the chuck attached is rotated, and the arm protruding from the outer circumference of the chuck is pushed at the free end of the elastic plate attached with the strain gauge and one end is fixed to the outer circumference of the drum. According to the bending of the plate at this time, The resulting change in the resistance value of the strain gauge continuously detects and judges the rotational load acting on the rotating shaft. As a result, an inspection device and an inspection method that reliably detect the rotational load, quickly, and have a small error can be obtained.

Fig. 1 is a cross-sectional view of a rotary operation type electronic component inspection device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of FIG. 1 .

3A and 3B are cross-sectional views of FIG. 1 .

Fig. 4 is a partial perspective view of a rotary operation type electronic component inspection device according to a second embodiment of the present invention.

Fig. 5 is a cross-sectional view of a conventional inspection device for rotary operation type electronic components.

FIG. 6 is an exploded perspective view of FIG. 5 .

FIG. 7 is a sectional view of FIG. 5 .

8A and 8B are characteristic diagrams.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

first embodiment

FIG. 1 is a cross-sectional view of a rotary operation type electronic component inspection device according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of FIG. 1 .

In both drawings, an element 10 is a switch, a variable resistor, an encoder, etc. to be inspected, has a rotating shaft 21 , and is operated by rotating the rotating shaft 21 . In this element 10 , mounting holes 23 and 25 serving as mounted portions are provided on the left and right sides of the rotating shaft 21 .

The inspection device of the component 10 has the following structure.

The mounting plate 12 of the mounting element 10 is provided with a through hole 31 in the center. In addition, on the upper surface of the plate 12 , protruding pins 33 and 35 are provided on the left and right sides of the hole 31 . The pins 33 and 35 are inserted into the mounting holes 23 and 25 while the rotating shaft 21 passes through the through hole 31 . In this way, the component 10 to be inspected is mounted on the mounting plate 12 constituting the inspection device.

The features of the first embodiment are as follows.

The bases of the pins 33 and 35 have a slightly smaller outer diameter than the mounting holes 23 and 25 into which they are inserted. And, the outer diameter of the tip of the upper end is made smaller as it inclines from the root to the tip. Therefore, in a state where the pins 33 and 35 are inserted into the mounting holes 23 and 25 , there is a gap between the pins 33 and 35 and the mounting holes 23 and 25 in a direction perpendicular to the rotation shaft 21 .

The upper part of the collet 13 is connected to hold the rotating shaft 21 . The chuck 13 is rotatably accommodated in the axial center portion of the drum 14 via a bearing 18 . The plate 15 is made of an elastic body such as a thin metal plate, and a strain gauge 16 whose resistance value changes according to bending is attached to an intermediate portion thereof. The lower end of the plate 15 is fixed to the outer periphery of the drum 14 , and the upper end which is a free end abuts on an arm 17 protruding from the chuck 13 . The strain gauges 16 are electrically connected to an inspection circuit (not shown) by wires.

In the above-mentioned first embodiment, when the drum 14 is rotated by an external force from a motor (not shown) etc., the free end of the plate 15 whose lower end is fixed on the outer circumference of the drum 14 is pressed against the outer circumference of the chuck 13. Protruding arm 17 . Thereby, the rotational force of the drum 14 is transmitted to the chuck 13 through the plate 15 and the arm 17, and the chuck 13 rotates. The rotation shaft 21 rotates with the rotation of the collet 13 . At this time, the plate 15 in contact with the arm 17 bends due to the rotational load acting on the rotating shaft 21 , so the strain gauge 16 attached to the plate 15 also bends in response to the rotational load. The resistance value of the strain gauge 16 is connected to the inspection circuit and transmitted, and the inspection circuit detects the rotational load from the signal. The detection circuit then compares the detection value with a preset reference value to determine whether the rotating load is well within the reference value.

3A and 3B , the method of mounting on the mounting plate 12 when the axial center of the rotating shaft 21 is displaced is described with reference to FIG. 3A and FIG.

First, as shown in FIG. 3A , the component 10 is lightly pushed from above to be placed on the mounting plate 12 . In this state, since the roots of the pins 33 and 35 on the mounting plate 12 are inserted into the mounting holes 23 and 25, the axial center of the rotating shaft 21 is eccentric to the axial centers of the mounting plate 12 and the chuck 13.

Then, when the collet 13 is raised from below and the upper part of the collet 13 abuts against the lower end of the rotating shaft 21, as shown in FIG. gaps between. The lower end of the rotating shaft 21 slides on the inclined surface of the inner periphery of the holding hole 41 of the chuck 13 , while the lower edges of the mounting holes 23 and 25 slide on the inclined surface of the pins 33 and 35 . As a result, the component 10 moves leftward relative to the mounting plate 12 and the chuck 13 . As a result, the axial centers of both the rotating shaft 21 and the collet 13 coincide, and the collet 13 connects and holds the rotating shaft 21 .

In this way, according to this embodiment, between the mounting holes 23 and 25 as the mounted portion of the component 10 and the pins 33 and 35 of the mounting plate 12, in a state where a gap is left in a direction perpendicular to the rotation shaft 21, the component 10 is installed on the mounting plate 12, so when the collet 13 connects and holds the rotating shaft 21, the element 10 only moves the amount of the gap, and the axial center of the collet 13 and the rotating shaft 21 can be kept in a consistent state Down. In addition, the collet 13 is rotatably housed and installed in the axial center of the drum 14 , and the drum 14 and the collet 13 are integrally rotated by attaching the plate 15 of the strain gauge 16 .

From the above, since the axial center of each constituent element can be checked in a uniform state, as shown in FIG. 8A, a stable waveform matching the actual rotational load can be obtained. Therefore, the range of the reference value set in the inspection circuit can be set to be small, and the rotating load can be detected with high precision, and at the same time, an inspection device and inspection method with improved detection speed, rapidity, and small error can be obtained.

2nd embodiment

Fig. 4 is a partial perspective view of a rotary operation type electronic component inspection device in a second embodiment of the present invention.

In FIG. 4, the difference from the first embodiment is as follows.

On the outer periphery of the chuck 13, two protruding arms 51 and 53 are provided, and the free end of the plate 15 to which the strain gauge 16 is attached is sandwiched between them. With this configuration, since the rotating shaft 21 can be rotated in both directions, left and right, and rotational loads in both directions can be detected, higher-precision inspection can be performed.

In addition, in the description of the above-mentioned first and second embodiments, the pin 33 of the mounting plate 12 is placed in the mounting holes 23 and 25 provided on the component 10 by leaving a gap in the direction perpendicular to the rotation shaft 21. The structure in which the components 10 are mounted on the mounting board 12 by inserting the components 10 and 35 has been described. But also conversely, when the component to be mounted is not the mounting holes 23 and 25 but a protruding part is provided, a hole is provided on the mounting plate side, and the above protruding part is placed by leaving a gap in the direction perpendicular to the rotation axis. Insert into the hole for installation. Alternatively, even in the case of a component that does not have such protrusions and holes, the present invention can of course be implemented by mounting the outer periphery of the component on the mounting plate as the mounted portion.

As described above, according to the present invention, it is possible to reliably detect the rotational load of the rotationally operated electronic component to be inspected, and it is possible to obtain an inspection apparatus and inspection method that is quick and has a small error.

Claims (3)

1. An inspection device for rotating electronic components, characterized in that it includes: A mounting plate for mounting a rotationally operated electronic component having a rotating shaft and a mounted portion on the mounted portion leaving a gap in a direction perpendicular to the rotating shaft; The chuck that connects and holds the rotating shaft; A drum on which the chuck is rotatably installed; An elastic plate with a strain gauge attached and one end fixed on the outer periphery of the drum; an arm projecting from the periphery of the collet and abutting the free end of the plate; A check loop connected to the strain gauge. 2. The inspection apparatus for a rotary operation type electronic component according to claim 1, wherein two arms protruding from the outer periphery of the chuck are provided, and the free end of the board is sandwiched between the two arms. 3. A method of inspecting a rotary operation type electronic component, characterized in that, leaving a gap in a direction perpendicular to the rotation axis for a rotary operation type electronic component having a rotation shaft and a mounted portion, and mounting a mounting plate on the mounted portion, retaining said swivel shaft connection on the collet, By rotating the drum on which the chuck is rotatably installed, At the free end of a plate having elasticity to which a strain gauge is attached and one end is fixed on the outer circumference of the drum, an arm protruding from the outer circumference of the chuck is pushed to rotate the rotation shaft, and, The rotation load acting on the rotation shaft is continuously detected and judged based on the change in the resistance value of the strain gauge caused by the bending of the plate at this time.

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