JPS59226814A - Inclinometer for oscillator - Google Patents

Abstract

PURPOSE:To detect the inclination of an oscillator with simple constitution by providing a flexible conductor in the center of the circular hole of a conductive plate, and deciding on the unbalance of the time when the conductor contacts the left and right part of the hole. CONSTITUTION:The conductive plate 10 which has the circular hole 11 and the flexible conductor 12 which oscillates freely in the center of the hole 11 are fitted to the oscillator at proper positions. Pulses are outputted from one terminal of a resistance 17 while the contactor 12 contacts and leaves the hole, and inputted to a pulse width measuring circuit 18 to output a voltage proportional to the contacting time. When the oscillator is in level, the times t1 and t2 when the conductor contacts the left and right parts of the hole 11 are the same and the level of a comparator 24 is still low, but when the oscillator slants, left and right contacting times t4 and t5 have some difference and the comparator 24 goes up to a high level to detect the inclination. Thus, the inclination of the oscillator is detected with the simple constitution.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an inclinometer for detecting the presence or absence of inclination, and more particularly to an inclinometer for a vibrating body suitable for detecting the inclination of a vibrating body.

Prior Art and Problems Detecting the inclination of a vibrating body has been considered difficult in the past because the sensor is affected by vibration. For example, a so-called level meter is applied as a method to automatically detect the inclination of an object.
It is conceivable to detect the movement of the air particles by some method, but if the object is vibrating, the air particles will also be vibrating, making it impossible to detect the inclination.

Purpose of the Invention The present invention has been made in view of the above circumstances.
The purpose is to provide an inclined needle for a vibrating body that can detect the inclination of the vibrating body with a simple configuration.

Principle of the Invention FIG. 1 is an explanatory diagram of the principle of the present invention. One end 1a of a flexible rod-shaped body 1 is supported so that the rod-shaped body 1 can vibrate freely around that point, and the central axis of the rod-shaped body 1 is set as shown in FIG. 1(a) in a state without inclination. First, the positional relationship between the ring 2 and the rod-shaped body 1 is determined so as to coincide with the center of the substantially circular ring 2 placed horizontally. One end 1a of the rod-shaped body 1 and the ring 2 are made to move together with the vibrating body, and when the rod-shaped body 1 is swung like a pendulum, when there is no inclination, the rod-like shape as shown in FIG. The time t1 during which the body 1 is in contact with one side of the ring 2 and the time t2 during which the rod-shaped body 1 is in contact with the other side of the ring 2 as shown in FIG.
As shown in a), they are almost equal. However, the vibrating body is 1
When rolling, the contact time between the rod-shaped body 1 and the ring 2 is t4. A difference occurs at t5 as shown in FIG. 2(b). Therefore, by detecting the imbalance of this time difference, it is possible to detect the inclination of the vibrating body. The rod-shaped body 1 naturally repeats vibration due to the vibration of the vibrating body, and no separate means for vibrating is required. That is, in the present invention, the inclination is detected by reversely utilizing the vibration of the vibrating body. As a means for detecting the contact time between the rod-shaped body 1 and the ring 2, it is sufficient to make the portion where the two touch each other conductive, and to determine the time during which a current flows.

Embodiment of the Invention FIG. 3 is a block diagram of essential parts of an embodiment of the invention. In the figure, reference numeral 10 denotes a conductive plate having a substantially circular hole 11, which is horizontally mounted at an appropriate location on the vibrating body.

Reference numeral 12 denotes a flexible conductive wire with a small diameter, one end 12a of which is attached to a suitable location on the vibrating body so that the conductive wire 12 can freely vibrate around that point. At this time, the mounting positions of the conductive plate 10 and the conductive wire 12 are determined in advance so that the central axis of the conductive wire 12 is located approximately at the center of the hole 11 with no inclination of the vibrating body. Of course, a box is provided in which the conductive plate 10 and the conductive wire 12 are assembled in the above positional relationship,
This box may be mounted on the shaker. 13 is a weight for facilitating the pendulum vibration of the conductive wire 12. 14 is a DC power source, which is connected to the conductive wire 12 and the conductive plate 10 through conductive wires 15 and 16. 17 is a resistor, and the sensor output OUT is taken out from one end thereof. 18 is a pulse width measuring circuit, which measures the time from the rise of each pulse included in the sensor output OUT to the fall of that pulse;
Outputs a voltage value proportional to that time. 9 is a control circuit which generates a gate signal for alternately turning on and off gates 20 and 21 every cycle of the pulse included in the sensor output OUT. The memory circuits 22 and 23 are both connected to the output of the pulse width measurement circuit 18 via the gate 20 or 21, store the output of the pulse width measurement circuit 18, and output the stored contents. This memory circuit 22.23
can be constructed from an integrating circuit, for example. 24 is a comparator, which takes the output of the memory circuit 22 as one input and the output of the memory circuit n as the other input, and when the output of the memory circuit 22 is larger than the output of the memory circuit n, the output is set to a high level ( 1”).

The operation of this embodiment will be explained using the waveforms shown in FIG. 2. When the vibrating body to which the conductive plate 10 and the conductive wire 12 are attached is not tilted at all, the sensor output OUT is as shown in FIG. The conductive wire 12 is connected to the conductive plate 1 as shown in a).
The time t1 of contact with one edge of the 00 hole 11 and the time t2 of contact with the other edge are approximately equal. At this time, if the pulse width t1 of pulse P1 in FIG. 2(a) is stored in the memory circuit 22, the pulse width t2 of the next pulse P2 will be stored in the memory circuit, and the difference between It is determined by a comparator. Furthermore, since the pulse width t3 of the next pulse P3 is stored in the memory circuit 22, the pulse widths of the pulse P2 and pulse P3 will be compared next. In this way, the pulse widths of adjacent pulses are sequentially compared. In the case shown in FIG. 2(a), since the widths of each pulse are all equal, the output of the comparator 24 remains at a low level, and it is detected that there is no inclination of the vibrating body.

On the other hand, when the sensor output 01lT shows a change as shown in FIG. The output of the comparator 24 becomes high level, and it is detected that the vibrating body is tilted.

Note that, as the conductive wire 12, for example, in addition to the linear body, a coiled conductor or conductive rubber may be used. Also,
It is not necessarily necessary to make the entire length conductive and flexible; the portion of the conductive plate 10 that touches the hole 11 may be made of a flexible material and conductive, or a conductive film may be pasted thereon. can. Similarly, in the conductive plate 10, the edges of the holes 11 may be made conductive, and for this purpose, the edges of the holes drilled in the non-conductive plate are plated with a conductive metal or a conductive film is pasted. It is also possible to adopt a configuration in which the

FIG. 4 is a block diagram showing the main parts of another embodiment of the present invention, in which the same reference numerals as in FIG. 3 indicate the same parts, and 40.4
1 is a comparator, 42 is an exclusive OR circuit, and VCC is a reference voltage. Reference voltage■. By setting C to a value slightly smaller (for example, 1.8 V) than the average value (for example, 2■) when there is no slope of the sensor output 011T, the memory circuit 2
Even if the output voltage of 2.23 fluctuates in the range of 1.8 or more, the output of each comparator 40, 41 is high level, so the output of exclusive OR circuit 42 remains low level, and the slope Also, even if the output voltage of the memory circuits 22, 23 fluctuates below 1.8 V, the output of each comparator 40, 41 becomes low level, so it is determined that there is no slope at this time as well. Then, when the output voltage of one of the memory circuits drops to 1.8V or less, the output of the exclusive OR circuit 42 becomes high level, and it is detected that the vibrating body is tilted. According to the previous embodiment, the comparator 24 operated when a voltage slightly higher than the one input terminal was applied to the ten input terminals, but according to this embodiment, the reference voltage VCC is used to indirectly operate the comparator 24. Since the unbalance of the pulse width is detected at the same time, there is a certain degree of leeway in the operation, and it is possible to perform tilt detection reliably.

In the above embodiments, the unbalance between adjacent pulse widths is detected by analog processing, but it is also possible to digitally process a part of the circuit using the arithmetic function of a microcomputer. In addition, by finding the average pulse width of every other multiple pulses and comparing that value with the average value of the pulse widths of other multiple pulses, the imbalance in pulse widths is detected. It is also possible to do so.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention includes a member having a substantially circular hole whose edge is electrically conductive, and a member having a substantially circular hole having a conductive edge, and a member that is supported so as to be able to vibrate and has an axial center substantially coincident with the center of the hole. A rod-shaped member inserted into the hole and having at least a portion that contacts the hole is flexible and conductive; and a current flows between the rod-shaped member and the hole. The area of the vibrating body can be detected with a simple configuration consisting of a contact time detecting means for detecting the contact time with the vibrating body and a discriminating means for determining the unbalance of the contact time. Therefore, the present invention is extremely effective when applied to detecting the inclination of a vibrating body, such as an automatic military device.

Note that even when the object on which the present invention is mounted is accelerated, the contact time between the rod-shaped member and the hole becomes unbalanced. It is also possible to apply it to a detector.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of the principles of the present invention, FIG. 3 is a block diagram of main parts of an embodiment of the invention, and FIG. 4 is a block diagram of main parts of another embodiment of the invention. 10 is a conductive plate, 11 is a hole, 12 isoelectric wire, 20, 21 is a gate, 24, 40, 41 is a comparator, and 42 is an exclusive OR circuit. Patent applicant Fujitsu Ten Ltd. Representative Patent Attorney Gobe Tamamushi (1 other person) Figure 1 (α) (b) (c) Figure 2 Figure 4 Y

Claims (1)

[Claims] a member having a substantially circular hole with a conductive edge; a member that is supported so as to be able to vibrate, is inserted into the hole such that its axial center substantially coincides with the center of the hole; and at least a portion that contacts the hole is flexible; a rod-shaped member having conductivity, and contact time detection means for detecting the contact time between the rod-shaped member and the hole based on the time during which a current flows between the conductive portion of the rod-shaped member and the conductive portion of the hole; An inclinometer for a vibrating body, characterized in that it is equipped with a determining means for determining an imbalance in contact time.