JPH03274410A - Inclination sensor - Google Patents

Abstract

PURPOSE:To prevent an erroneous detection from being generated by filling a liquid for braking the movement of a spring-like pendulum piece in a closed container and providing a detecting portion by a Hall element IC outside a bottom portion in a position corresponding to the movement of a magnet body. CONSTITUTION:A spring-like pendulum piece 2 has an upper portion fixed to a closed container 1 and a magnet body 3 fixed to the lower portion of the pendulum piece 2. A printed wiring board 7 is provided with a Hall element IC 4 in a position corresponding to the movement of the magnet body 3 generat ed by the inclination of the container 1. When an inclination sensor 200 is in clined by an angle theta deg. with respect to a vertical direction, the pendulum piece 2 is swung to be bent in the direction of the thickness of a leaf spring by the weight of the magnetic body 3 to move the magnet body 3. Accordingly, a magnetic field from the magnet body 3 which passes IC 4 changes and the quantity of a change is detected by IC 4 to obtain a detection output correspond ing to the inclination theta deg.. Further, since a braking liquid 5 is filled in the con tainer 1, the free vibration of the pendulum piece 2 is restrained by the resis tance of the liquid 5 and the erroneous detection of the inclination due to the vibration of an object to be detected is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a sensor using a pendulum magnet and a Hall element 1c.

[Conventional technology]

This type of inclination angle sensor has a configuration in which a pendulum piece with a magnet fixed to the bottom is installed inside a sealed container, and the amount of inclination with respect to the vertical direction is measured by detecting the amount of movement of the magnet with a Hall element IC. "Sensor Technology J Magazine: December 1988 issue (VOL, 8. No. 13
) etc.

The configuration disclosed above will be explained with reference to FIGS. 16 to 18.

In FIG. 16, the tilt angle sensor 100 is a solid pendulum 10.
It is composed of a pendulum magnet part by 5 and a magnetic field change detection part by Hall elements Ic and 06.

The solid pendulum 105 is supported by a fulcrum 104 located above the interior of the sealed container 110, and as shown in FIG. Magnet 101 inside each
A and 101b are provided facing each other, and a magnetic field gap 107 is formed below a solid pendulum 105, thereby forming a pendulum magnet portion.

Also, an electronic element IC (referred to as a Hall element IC in this invention) that obtains an electrical detection output by the Hall effect.
106 is disposed within the magnetic field gap 107 and fixedly provided in the lower part of the sealed container 110, thereby forming a magnetic field change detection portion.

Then, as shown in FIG. 17, when the tilt angle sensor 100 is tilted by θ0 with respect to the vertical direction 102, the Hall element Ic,
Since the position of the magnet 101a101b relative to 06 is shifted by an amount corresponding to 00, the Hall element Ic and 05 are arranged so that a detection output is obtained from the change in the magnetic field caused by the shift.

In addition, this type of inclination angle sensor can be used to measure the inclination angle in fish detection sonar to correct deviations in the direction of the search beam due to ship vibration, or in construction excavation equipment for drilling holes in underground concrete columns. Measurement of the angle of inclination to correct vertical bending.

[Problem to be solved by the invention]

With the above configuration, detection errors occur due to wear of the fulcrum 104 due to long-term use, or changes in frictional resistance at the fulcrum, as well as magnetic field gaps 107 and Hall elements Ic, 06. Since the positional relationship between the two influences the detection accuracy, this positional relationship must be adjusted in the narrow interior of the sealed container 110 during manufacturing, and during maintenance, the task of replacing the Hall element Ic 106 if it is defective is required. There were also disadvantages such as difficulty in

Therefore, there is a problem in that it is desired to provide a device that eliminates these disadvantages with a simple configuration.

[Means to solve the problem]

At the beginning of this period, a pendulum piece with a magnet fixed below z't'm,%gg Yu2 as described above is installed inside the airtight container, and the amount of movement of the magnet is detected by the Hall element 1c. An inclination angle sensor that measures the amount of inclination relative to A pendulum forming means is formed by a pendulum piece and has a magnet fixed below the spring-like pendulum piece for creating a magnetic field outside the bottom portion of the closed container, and movement of the spring-like pendulum piece inside the closed container. By providing a liquid braking means filled with liquid for braking, and a bottom outer detection element means providing a detection part using a Hall element IC on the outside of the bottom part of the closed container at a position corresponding to the movement of the magnet body, the above-mentioned It is designed to be able to solve the problems in the section.

〔Example〕 Examples will be described below with reference to the drawings.

FIG. 1 shows an embodiment in which a Hall element IC is provided on a printed wiring board.

In the figure, the closed container l is made of non-magnetic material, and the bottom part a
An open hollow part is provided on the outside of the holder.

The spring-like pendulum piece 2 provided inside the closed container 1 is mainly formed of a thin spring plate, and its upper part is fixed to the closed container l.

A magnet body 3 is fixedly provided below the spring-like pendulum piece 2, and the magnetic field is formed in the outer cavity part through the bottom part a, so that the bottom part a, which corresponds to the ceiling of the cavity part, is as much as possible. It is formed with a thin wall thickness.

A Hall element IC4 is wired as a circuit element to the printed wiring board 7, and the printed wiring board 7 is formed at the lower end of the airtight container 1 so that the Hall element IC4 is placed inside the cavity a. 7. It is fixed using screws etc. using the mounting holes d located at key points of the lange IA.

The position of the hole lc4 is selected to correspond to the movement of the magnet 3 caused by the tilting of the closed container 1, so that the range of the inclination angle to be detected corresponds to the movement of the magnet 3 caused by the tilting of the closed container 1. , the Hall element IC4 is also fixed so as to be located at the center of the hermetic container 1.

In other words, when the tilt angle sensor 200 is tilted by the tilt angle θ0 with respect to the vertical direction as shown in FIG. Therefore, the position of the magnet body 3 moves.

Therefore, the magnetic field from the magnet 3 passing through the Hall element IC4 changes 15, and the amount of this change is detected by the Hall element IC4, resulting in a detection output corresponding to the inclination angle θ0.

The inside of the sealed container l is filled with a damping liquid 5 to suppress the free vibration of the spring-like pendulum piece 2 by the resistance of the liquid 5. Vibration, for example, in the case of equipment installed on a ship, the spring-like pendulum piece 2 is unnecessarily swayed by engine vibration, or the spring-like pendulum piece 2 is over-oscillated due to a sudden change in the inclination angle, and the inclination angle may change. This is to avoid false detection.

Further, even if the printed wiring board 7 is dedicated to the tilt angle detection part, it may be a dual-purpose type that is integrated with other circuit parts, such as a correction control circuit for correcting fluctuations in the detection beam due to the tilt angle. It may be a printed wiring board.

Figure 3 shows the actual if1 in the case of a configuration in which the Hall element IC is fixed to the inner surface of the lid of the cavity provided at the bottom of the airtight container.
It is.

In the figure, parts indicated by the same numbers as in Figure 1 are
The components are the same as those shown in the figure, and in this embodiment, a lid 6 is provided with a protrusion C that is fitted into the inner diameter of the cavity, and the Hall element IC4 is fixed to the inner surface of the lid 6. In addition, a terminal 4 for the Hall element IC is provided on the outside of the lid 6.
A is provided, and the position of the Hall element IC4 relative to the magnetic body 3 is changed so that the same arrangement conditions as in the case of FIG. 1 are obtained.

By fixing the mounting holes e provided at key points between the flanone IA and the lid 6 at the lower end of the airtight container 1 with the eyelet studs 6A, the airtight container 1 and the lid 6 can be assembled together, and the eyelet The center hole e of the stud 6A is used to attach it to the object to be detected.

Moreover, the lid body 6 in this configuration may be constructed from a printed wiring board.

FIG. 4 shows an embodiment in which the Hall element IC is fixed to a hollow part of the bottom part a of the closed container 1.

In this case, the Hall element IC4 is directly adhesively fixed to the lower surface of the bottom portion a, or is pressed and fixed using the fixing hand 8.

A female threaded hole hl is provided in the thick bottom portion g outside the hollow component, and the inclination angle sensor 200 is attached to the object to be detected.

Next, a specific structural example of the configuration shown in FIG. 1 will be explained.

In FIGS. 5(A), (B), and (C) and FIG. 6, the case 11 and the airtight lid 12 constitute the airtight container 1 shown in FIG.

The case 11 is a cylindrical body made of aluminum alloy material, and as shown in FIG. A small hollow portion at the bottom is formed with a mounting 7 flange IIA at the lower end portion, and a mounting hole d formed by a screw hole is provided in the mounting flange IIA.

The sealing lid 12 is a short cylindrical body made of an aluminum alloy material, and as shown in FIG. A packing groove 12c of the O-ring packing 19 located between the surface portion 12B and the cylindrical surface portion 12B,
A semi-cylindrical portion 12D is formed by cutting a cylinder from the center, and a screw hole 12E for attaching a spring-like pendulum piece is provided on the cut vertical side y of the semi-cylindrical portion 12D.
In the upper part where D is not provided, a through hole 12F for air venting is provided by a screw hole.

The spring plate 13, magnet holder 14, and spacer 15 constitute the spring-like pendulum piece 2 shown in FIG. Therefore, the assembly is fixed to the vertical side surface y of the semi-cylindrical portion 12D of the sealing lid 12 with the screws 17.

In this assembly, the vertical side surface y was shifted by 1/2 of the thickness of the spring plate 13 from the center position of the sealing lid 12 so that the center of the spring plate 13 in the thickness direction is at the center of the tilt angle sensor 200. It's in position.

The spring plate 13 is made of a phosphor bronze plate for springs with a thickness of about 0.08 mm, and has a vertically long mouth shape with the central part cut out. part 1
3A, and has a rectangular notch 13B at the bottom for hooking and fixing a magnet holder 14 (described later), and an assembly hole 13c corresponding to a screw 17 for assembling the upper part. - The magnet holder 14 is a holding seat for a magnet body made of brass material, and as shown in Fig. 10, it is formed of an oblong rectangular body with a thickness of about 4 mm, and has two sides on both sides and the bottom of the center position in the thickness direction. A slit 14A with a width of about 0.5 mm for inserting the rectangular notch 13B of the spring plate 13 is inserted into the slit 14A, and magnets 18A-18 (described later) are provided on both sides of the center in the lower thickness direction.
Notches 14B and 14C are provided for fixing B.

The spacer 15 is an intervening body for the magnet holder 14 made of brass material, and as shown in Fig. 11, it is formed in the shape of an upward opening, and its outer side has the same dimensions as the spring plate 13.
The inner cutout portion 14A is the slit i of the magnet holder 14.
l! It has a shape that can be inserted into 14A.

The thickness of the spacer 15 is about 1/2 of the width of the slit i1!14A minus the thickness of the spring plate 13, that is, about 0.2 mm, so that it can press the spring plate 13 from both sides in the thickness direction. Then, attach the spring plate 13 and the magnet holder 1.
Insert it between 4 and secure with adhesive.

The magnets 18A-18B constitute the magnet body 3 shown in Fig. 1, and are made of cylindrical ferrite magnets.As shown in Fig. 12, the magnets 18A-18B are about 3 mm in diameter and 3 mm in height, and the magnetic polarity is reversed. By placing the spring plate J3 in the notches 14B-14c on both sides of the magnet holder 14,
- A magnet body is arranged at the lowest end of a spring-like pendulum piece composed of a pendulum 14 and a spacer 15.

Then, after inserting the integral assembly from the sealing lid 12 to the O-ring packing 19 through the upper opening of the case 1, the assembly is fixed with the screw 20 at the upper end of the case 1, and the through hole of the sealing M12 is inserted. After injecting silicone oil 21 corresponding to the brake fluid 5 in Fig. 1 from 12F,
It is closed with a screw 22 with a seat.

In addition, the lower end of magnet 18A-18B and the bottom part a of case l
The gap Gl with the top surface is a narrow gap of about 1 mm or less, and the gap is such that even when the magnets 18A-18B are swung to detect the required inclination angle, the lower ends do not come into contact with the bottom part a. It is.

The circuit wiring board 31 is a component of the printed wiring board 7 shown in FIG. 1, and mainly includes circuit elements of the tilt angle correction control circuit section.

The Hall element IC32 constitutes the Hall element IC4 of FIG. 1, and uses a commercially available DN835 type Hall IC (linear type).

Then, the mounting hole 31A provided in the circuit wiring board 31 is aligned with the mounting hole d on the lower end side of the case 1, and the assembly is fixed together with a screw 31B with a spring washer.

The mounting hole 31A is provided at a position such that the center of the spring plate 13 in the thickness direction, that is, the center of the case 1 and the detection center of the Hall element IC 32 coincide, and
The hole is large enough to accommodate the diameter of the hole, and the relative position between the Hall element IC32 and the case l can be adjusted by checking the detection output of the Hall element IC32 while performing an inclination angle detection test. be.

In addition, the top surface of the Hall element IC32 and the bottom part a of the case l
The gap G2 between the lower surface and the lower surface is set to be as narrow as possible, about 0.5 mm.

[Transformation implemented]

This invention can be modified and implemented as follows.

(1) At least the bottom portion a of the closed container 1 is made of a non-magnetic material, and the other portions are made of an appropriate material, and the magnet body 3 is made of a non-magnetic material.
so that a magnetic field is formed outside the bottom part a.

(2) In the one in Figure 1, without providing a hollow part,
Assume that only a Hall element C4 is fixed to the outer surface of the bottom part a.

(3) In the case shown in FIG. 3, the Hall element IC4 is fixed to the outer surface of the bottom part a, as in the case shown in FIG.

(4) The arrangement of the magnet bodies in Fig. 12 is arranged so that two magnets face each other with the same magnetic polarity as shown in Fig. 13,
Alternatively, as shown in FIG. 14, the magnetic polarities are arranged horizontally so that the detection output from the Hall element IC can be appropriately obtained in response to a change in the required detection inclination angle.

(5) The magnet body is formed into an appropriate shape such as a square prism or a rectangular prism, or is formed by an Ill magnet.

In addition, the way the magnet is held is changed so that the magnet is directly attached to the spring-like pendulum piece without using a magnet holder.

(6) Cut out important points around the hollow part so that the relationship between the Hall element IC and the bottom part a can be seen from the outside, or cut out the area around the bottom of the sealed container as shown in Figure 15. By providing and supporting the pillars 35, a space corresponding to a hollow portion is formed.

(7) Change liquid 5 to a highly viscous liquid such as hemp oil.

(8) Change the hollow hole in the center of the spring plate 13 to an appropriate shape, or change the material to an appropriate material such as blued stainless steel.

〔Effect of the invention〕

According to this invention, as described above, the pendulum part of the pendulum magnet is formed of a spring-like pendulum piece made of a thin plate spring, and the upper part thereof is fixed, so that it wears out over time. Since there are no points, and the deflection of the magnet and changes in the angle of inclination are always kept constant, there is no detection error over time. Since the spring plate-like surface of the pendulum is damped by the liquid filled in the closed container, it is possible to prevent excessive swinging due to vibrations that are not detected or sudden changes in the angle of inclination.

Furthermore, the installation of the Hall element IC, which becomes the detection element,
Since the pendulum magnet is attached to the outside of the sealed container or to a separate component, adjustments to the corresponding position of the magnet during manufacture of the Hall element IC and defective replacements during maintenance can be easily performed regardless of the pendulum magnet component. It has features such as being able to

[Brief explanation of drawings]

The drawings show examples, and Figures 1 and 2 are functional configuration diagrams of the basic configuration, Figures 3 and 4 are functional configuration diagrams of modified configurations, and Figure 5 is a functional configuration diagram of the modified configuration.
Figures (A,), Figure 5 (B), and Figure 5 (C) are specific configuration diagrams, Section 5 (A,) is a front partial vertical sectional view, and Figure 5 (B) is a side partial vertical sectional view. , FIG. 5(C) is a perspective view of essential parts of the bottom, FIG. 6 is a perspective partial cross-sectional view of the specific configuration, FIGS. 7 to 11 are parts diagrams of the specific configuration, and FIG. 7 is a front longitudinal sectional view. Figure 8 is a front view, Figures 9 to 11 are perspective views, and Figures 13 to 14.
The figure is a layout diagram of the magnet body, Figure 15 is a front partial cross-sectional view of a modified concrete configuration, Figures 16 and 17 are functional configuration diagrams of the conventional basic configuration, and Figure 19 is a perspective view of the main parts of a conventional concrete configuration. be. ■...Airtight container 2...Spring pendulum piece 3...Magnet body 4...Hall element IC 5...Liquid 6...Lid body 7...Printed wiring board 8...Fixed band 11...case 12...tight lid 13...spring plate 14...magnet holder 15...spacer 16...pressing plate 17...screws 18A-B...magnet 19.・・0 ring deviation 20・screw 21・silicon oil 31・・printed wiring board nakaji no 3 ya 2rgJ −! J4 Hatake 32...Hall element! a... Bottom part b... Hollow part

Claims (3)

[Claims] (1) An inclination angle sensor that measures the amount of inclination with respect to the vertical direction by providing a pendulum piece with a magnet fixed to the bottom inside a sealed container and detecting the amount of movement of the magnet with a Hall element IC, comprising: a , a container forming means in which at least the bottom portion of the sealed container is made of a non-magnetic material; b. the pendulum piece is formed by a spring-like pendulum piece mainly consisting of a thin spring plate whose upper part is fixed to the sealed container; and a pendulum means for fixing a magnet below the spring-like pendulum piece to create a magnetic field outside the bottom portion; c. damping the movement of the spring-like pendulum piece inside the airtight container; d. Bottom outer detection element means for providing a detection portion by the Hall element IC on the outside of the bottom portion at a position corresponding to the movement of the magnet body. sensor. (2) The sensor according to claim 1, comprising: (a) the detection portion having a printed wiring board on which the Hall element IC is formed as a part of a circuit element fixed to the bottom portion. (3) The sensor according to claim 1, wherein: (a) the closed container is a cylindrical body having an open upper portion and a closed bottom portion;
a container forming means formed by a lid for closing the upper portion; b. pendulum support means for fixing and supporting the upper portion of the spring-like pendulum piece on the lower portion of the lid; c. the tube. A hollow portion with an open bottom is provided on the outside of the bottom portion of the shaped body, and detecting unit arranging means for arranging the Hall element IC in the hollow portion.