JPH0453529Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an inclination sensor that can detect whether the inclination is left or right and the angle of inclination when the inclination is from the horizontal state to the left or right.

[Conventional technology]

A conventional tilt sensor of this type is shown in FIGS. 8 to 13, and will be described below.

This tilt sensor is installed inside an outer case 1, and a board 2 on which electronic components etc. are installed.
two semicircular electrodes 5 with their straight sides facing each other,
6 is printed.

A mounting hole 2a is bored in this board 2,
The legs 4a of the circular electrode 4 facing the electrodes 5 and 6 are inserted and soldered therein.

A case 3 is attached to the substrate 2 and covers the electrodes 4, 5, and 6. A container is formed between the case 3 and the substrate 2, and silicone oil 7 is injected into the dielectric liquid from the injection port 3a of the case 3. Injected as
The injection port 3a is closed with a rubber stopper 8.

The amount of silicone oil 7 to be injected is as follows:
The lower halves of electrodes 5 and 6 are only immersed, and therefore, electrode 4 and electrodes 5 and 6 form a capacitor with a surface capacitance with silicone oil 7 interposed therebetween.

The electrode 4 is connected to an oscillation circuit 9 as shown in FIG.
The electrodes 5 and 6 are connected to the operational amplifier 1, respectively.
The outputs of the operational amplifiers 10 and 11 are connected to the operational amplifier 12.

In this tilt sensor, when the outer case 1 is kept horizontal, the area where the electrodes 5 and 6 are immersed in the silicone oil 7 is the same, and therefore the electrodes 5 and 6 are immersed in the silicone oil 7.
The capacitances of the capacitors formed by 6 are the same.

Therefore, since the outputs of the operational amplifiers 10 and 11 are the same, the output from the operational amplifier 12 becomes zero, and a horizontal state is detected.

However, when the outer case 1 is tilted to either the left or right side, the amount of silicone oil 7 immersed in one electrode 5 or 6 increases, so the capacitance of the capacitor on that side increases, and one operational amplifier 10 or 11 The output of one becomes larger than the other, and a positive or negative output is obtained from the operational amplifier 12.

The direction of inclination can be determined by the sign of this output, and the angle of inclination can be determined by the magnitude of the output.

[Problem that the invention attempts to solve]

In the above-described tilt sensor, while the tilt angle of the outer case 1 is up to 90 degrees, the amount of silicone oil 7 immersed in one electrode 5 or 6 continues to increase, and the amount of immersion in the other electrode 6 or 5 decreases. When the temperature reaches 90 degrees, the amount of immersion reaches its maximum and minimum.

Therefore, the output of the operational amplifier 12 continues to increase up to 90 degrees, and reaches its maximum at 90 degrees.

However, after 90 degrees, the other electrode 6 or 5 begins to be immersed in the silicone oil 7 again, so the output of the operational amplifier 12 begins to decrease, resulting in the output characteristics shown in FIG. 14.

Therefore, there are two angles at which the output of the operational amplifier 12 is the same, one before and after 90 degrees, and there is a drawback that it is not possible to determine which angle it is.

Therefore, in view of the problems of the conventional tilt sensor mentioned above, the present invention has been developed to prevent the output from changing when the tilt angle exceeds 90 degrees, and to detect when the tilt angle exceeds 90 degrees. The purpose of the present invention is to provide a tilt sensor that provides a tilt sensor.

[Means for solving problems]

In order to achieve the above object, the inclination sensor made according to the present invention includes two electrodes provided adjacent to each other, another electrode facing the two electrodes on the entire surface, and the entirety of the two electrodes and the other electrode. a dielectric liquid injected into the container, and a partition wall provided between the two electrodes, with one side of the partition wall remaining between the two electrodes. The method is characterized in that the container is partitioned to form a liquid reservoir having a volume capable of storing all of the dielectric liquid together with the container.

[Operation] With the above configuration, by installing the inclination sensor with the one side not partitioned by the partition wall facing downward, when the inclination sensor is tilted by 90 degrees or more, The dielectric liquid that has moved in the liquid pool corresponding to the electrode is all collected in the liquid pool and no longer moves, and the other electrode is no longer immersed in the dielectric liquid.

[Example of idea]

Next, an example of implementation of the present invention will be described below with reference to FIGS. 1 to 7.

In FIGS. 1 and 2, reference numeral 22 denotes a board on which electronic components are mounted, and it has two semicircular electrodes 25, which are spaced widely apart on the upper side and narrowly spaced on the lower side. 26 is printed and a mounting hole 22a is bored.

Reference numeral 24 denotes an electrode having a recessed part 24a formed in the upper part corresponding to the width of the upper space between the electrodes 25 and 26 so as to face the electrodes 25 and 26;
b is inserted into the mounting hole 22a and soldered to face the electrodes 25 and 26 and mounted.

Reference numeral 23 denotes a case attached to the substrate 22 so as to cover the electrodes 24, 25, and 26, and between the case 23 and the substrate 22 is a container containing silicone oil 27, which is a dielectric liquid.

The lower half of the case 23 is curved toward the substrate 22 so that the distance between the case 23 and the substrate 22 becomes narrower. Therefore, when the case 23 is in a horizontal state, even if the amount of silicone oil 27 is small, the electrodes 25 and 26 are The silicone oil 27 is immersed slightly below the partition walls 29 and 30, which will be described later.

Further, two partition walls 29 and 30 are formed in the upper half of the case 23 along the recessed part 24a of the electrode 24, and oil reservoirs 31 and 32 are formed on the left and right sides of the partition walls 29 and 30. , 32 have a capacity to store all the silicone oil 27 injected.

An injection port 23a is formed in the upper part of the case 23 between the partition walls 29 and 30, and is closed with a rubber stopper 28 after silicone oil 27 is injected.

The electrode 24 is connected to the oscillation circuit 9 as in the conventional case, and the electrodes 25 and 26 are connected to the operational amplifier 1, respectively.
The outputs of the operational amplifiers 10 and 11 are connected to the operational amplifier 12.

Now, when this tilt sensor is in the horizontal state, the electrodes 25 and 26 are symmetrical about the vertical axis, so
The area immersed in silicone oil 27 is equal;
The capacitance formed between the electrode 24 and the electrode 24 is the same.

Therefore, as in the conventional case, the operational amplifiers 10 and 11
The outputs of the operational amplifier 12 are equal, the output of the operational amplifier 12 becomes zero, and a horizontal state is detected.

When this tilt sensor tilts to either the left or right, the electrode 25 and
26 is inclined, and the surface immersed in silicone oil 27 increases on one side and decreases on the other, so the capacitance of the capacitor formed between it and the electrode 24 also increases or decreases.

Therefore, although a positive or negative output is obtained from the operational amplifier 12 as in the conventional case, the tilt direction of the tilt sensor is determined by the positive or negative output.

Furthermore, since the area of the electrodes 25 and 26 immersed in the silicone oil 27 increases or decreases depending on the tilt angle of the tilt sensor, the capacitance of the capacitor also increases or decreases, and therefore the output of the operational amplifier 12 also increases or decreases. Therefore, the angle of inclination can be detected.

Furthermore, if the tilt sensor is tilted more than 90 degrees,
The silicone oil 27 that has moved to one electrode 25 or 26 is prevented from moving to the other electrode by the partition wall 29 or 30, and the oil reservoir 3
1 and 32 can store all the silicone oil 27, so it is stored there.

Therefore, if the angle exceeds 90 degrees, one side electrode 25 or 2
Since the capacitance on the electrode 6 side remains maximum and the capacitance on the other electrode 26 or 25 side remains minimum, the output of the operational amplifier 12 does not change.

A diagram showing the tilt angle of such a tilt sensor and the output of the operational amplifier 12 is shown in FIG.
The tilt state can be determined.

If this inclination sensor is installed on the bucket of a construction machinery bucket hoe that has a large inclination angle of 90 degrees or more, if the angle is within 180 degrees, it will be possible to determine which direction the bucket should go when horizontally controlling the soil after scooping the soil. You can judge whether it is level by turning the
This facilitates horizontal control.

[Effect of idea]

As mentioned above, the present invention is designed so that the inclination angle of the inclination sensor is
When the angle is 90 degrees or more, the capacitance of the two capacitors formed by the two electrodes does not change and remains constant, so the slope is 90 degrees or more due to the unchanged capacitance ratio. I can recognize that.

Therefore, unlike conventional inclination sensors, it is not difficult to determine whether the angle is less than or greater than 90 degrees, and it can be used for work or tools that involve large inclinations of 90 degrees or more, such as bucket control for construction machinery. This is suitable as a tilt sensor, etc.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of one embodiment of the present invention, Fig. 2 is a front view with part of the case and electrode cut away, Fig. 3 is a front view of the electrode, and Figs. 4 and 5 are a front view of the case. , Fig. 6 is a longitudinal cross-sectional view, Fig. 7 is a diagram of inclination angle and capacitance difference, Fig. 8 is an oblique view of a conventional tilt sensor, and Fig. 9 is an oblique view of its substrate. , Fig. 10 is a front view of the substrate, Fig. 11 is a front view of the electrode, and Fig. 11 is a front view of the electrode.
Figure 2 is a slope view of the case, Figure 13 is a circuit diagram, and Figure 1.
Figure 4 is a diagram of the tilt angle and the output of the operational amplifier. 22... Board, 23... Case, 24, 25,
26...electrode, 27...silicone oil, 29,
30...Partition wall.

Claims (1)

[Claims for Utility Model Registration] Two electrodes provided adjacent to each other, another electrode facing the two electrodes on the entire surface, a container housing the entirety of the two electrodes and the other electrode, and the container. and a partition wall provided between the two electrodes, the partition wall partitioning the container with one side remaining between the two electrodes, and the partition wall partitioning the container with one side remaining between the two electrodes, and a liquid reservoir having a volume capable of storing all of the dielectric liquid.