JP2916627B2 - Tilt angle sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a tilt angle sensor for measuring a tilt amount with respect to a vertical direction using a pendulum magnet and a Hall element IC.

[Conventional technology]

This type of tilt angle sensor has a configuration in which a pendulum piece having a magnet body fixed below is provided inside a closed container, and the amount of movement of the magnet body is detected by a Hall element IC to measure the tilt amount with respect to the vertical direction. What is “Sensor Technology”
Magazine: December 1988 (VOL.8, NO.13).

The configuration disclosed above will be described with reference to FIGS.

In FIG. 16, the tilt angle sensor 100 includes a pendulum magnet portion formed by the solid pendulum 105 and a magnetic field change detection portion formed by the Hall element IC 106.

The solid pendulum 105 is connected to a fulcrum 10
As shown in FIG. 18, the lower side is divided into two forks and divided forks 103a and 103b are provided.
By providing magnet bodies 101a and 101b opposite each inside of 103b and forming a magnetic field gap 107 below the solid pendulum 105,
A pendulum magnet portion is formed.

Further, an IC of an electronic element that obtains an electrical detection output by the Hall effect (referred to as a Hall element IC in the present invention) 10
6 in the magnetic field gap 107 described above,
, A magnetic field change detection portion is formed by being fixed below the inside.

Then, as shown in FIG. 17, when the inclination angle sensor 100 is inclined by θ ° with respect to the vertical direction 102, the positions of the magnet bodies 101a and 101b with respect to the Hall element IC 106 are displaced by an amount corresponding to θ °. The generated magnetic field change is designed to obtain a detection output from the Hall element IC 106.

Applications of this kind of tilt angle sensor include tilt angle measurement to correct the deviation of the inspection beam direction due to swaying of the hull in a fish finder sonar, or drilling holes for underground concrete columns in a construction drilling method. Angle measurement to correct the bending of the vertical method.

[Problems to be solved by the invention]

In the above configuration, a detection error occurs due to wear of the fulcrum 104 due to long-term use, or a detection error also occurs due to a change in frictional resistance of the fulcrum, and the position between the magnetic field gap 107 and the Hall element IC 106 is increased. Since the relationship affects the detection accuracy, it is necessary to adjust this positional relationship in the narrow interior of the sealed container 110 during manufacturing, and it is difficult to replace the Hall element IC 106 if it is defective during maintenance. There were some inconveniences.

For this reason, there is a problem that it is desired to provide a simple configuration that solves these inconveniences.

[Means for solving the problem]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides: (1) a case in which at least a seat is made of a non-magnetic material, a sealing lid for closing an upper end of the case, and an upper end fixed to a bottom surface of the sealing lid. A spring-like pendulum piece having a thin spring plate suspended in the case, a plurality of magnets suspended along the plate surface of the spring plate to form a magnetic field outside the bottom of the case, and provided outside the bottom of the case The above problem can be solved by providing a Hall element IC that detects the amount of movement of the magnet and a braking liquid that is filled in the case and brakes the functions of the spring-like pendulum piece and the magnet.

(2) In the above (1), the plurality of magnets are attached along the plate surface of the spring plate with the side surfaces facing each other, so that the above-mentioned problem can be solved.

(3) In the above (1) or (2), the Hall element IC
Is mounted on a printed wiring board, and the printed wiring board is fixed to the outside of the bottom of the case, so that the above problem can be solved.

〔Example〕

 Hereinafter, embodiments will be described with reference to the drawings.

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

In the figure, a closed container 1 is made of a non-magnetic material, and has an open cavity b outside a bottom a.

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

Below the spring-like pendulum piece 2, a magnet body 3 is fixedly provided,
Since the magnetic field is formed in the outer cavity b through the bottom a, the bottom a corresponding to the ceiling of the cavity b is formed as thin as possible.

The printed wiring board 7 is wired with the Hall element IC4 as a circuit element, and the printed wiring board 7 is formed at the lower end of the sealed container 1 so that the Hall element IC4 is arranged inside the hollow portion a. It is fixed by screws or the like using mounting holes d at key points of the flange 1A.

The arrangement position of the Hall IC 4 is selected so that the range of the inclination angle to be detected corresponds to the movement of the magnet body 3 caused by the inclination of the closed container 1. Is fixed so that the Hall element IC4 is also located at the center of the sealed container 1.

In other words, as shown in FIG. 2, when the inclination angle sensor 200 is inclined by an inclination angle θ ° with respect to the vertical direction, the weight of the magnet body 3 causes the spring-like pendulum piece 2 to swing in the thickness direction of the spring plate and bend. Therefore, the position of the magnet body 3 moves.

Therefore, the magnetic field from the magnet body 3 passing through the Hall element IC4 changes, and the amount of this change is detected by the Hall element IC4, and a detection output corresponding to the inclination angle θ ° is obtained.

The inside of the closed container 1 is filled with a braking liquid 5 so that free vibration of the spring-like pendulum piece 2 is suppressed by the resistance of the liquid 5. When the spring-like pendulum piece 2 is unnecessarily rocked by vibration, for example, in an engine mounted on a ship, or the spring-like pendulum piece 2 is excessively vibrated by a sudden change in the inclination angle, the inclination angle is increased. Is not erroneously detected.

Further, the printed wiring board 7 may be dedicated to the tilt angle detection portion, but may be integrated with other circuit portions, for example, a correction control circuit for correcting the fluctuation of the detection beam due to the tilt angle. Printed wiring board.

FIG. 3 shows an embodiment in the case of a configuration in which the Hall element IC is fixed to the inner surface side of a lid portion for a cavity provided in the bottom portion of a closed container.

In the drawing, the parts indicated by the same reference numerals as those in FIG. 1 are the same components as those in FIG. 1, and in this embodiment, a lid provided with a protruding edge c which is inserted into the inner diameter of the hollow part b 6, the Hall element IC4 is fixedly provided on the inner surface side of the lid 6, and a terminal 4A for the Hall element IC is provided outside the lid 6, and the position of the Hall element IC4 with respect to the magnetic body 3 is The arrangement conditions are the same as those in FIG.

By fixing the mounting hole e provided at a key point between the flange 1A of the lower end portion of the closed container 1 and the lid 6 with the eyelet 6A, the closed container 1 and the lid 6 are assembled and the center of the eyelet 6A is fixed. It is designed to be attached to the object to be detected using the hole e.

Further, the lid 6 in this configuration may be formed by a printed wiring board.

FIG. 4 shows an embodiment in a case where the Hall element IC is fixed to the hollow portion f of the bottom portion a of the closed casing 1.

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

A female screw hole h is provided in a thick bottom portion g outside the hollow portion f, and the tilt angle sensor 200 is attached to the detection target.

Next, a specific structure example in the configuration of FIG. 1 will be described.

5 (A), (B), (C) and FIG. 6, the case 11 and the sealing lid 12 constitute the sealed container 1 of FIG.

The case 11 is a cylindrical body made of an aluminum alloy material, and as shown in FIG.
11B, a small hollow portion b below a thin bottom portion a of about 0.5 mm or less and a mounting flange 11A at a lower end portion, and a mounting hole d formed by a screw hole is provided in the mounting flange 11A. .

The sealing lid 12 is a short columnar body made of an aluminum alloy material, and as shown in FIG. A surface portion 12B, a packing groove 12C of an O-ring packing 19 located in the middle of the cylindrical surface portion 12B, and a semi-cylindrical portion 12D formed by cutting a cylinder from the center are formed, and on the cut vertical side surface y of the semi-cylindrical portion 12D. Is a screw hole 12E for mounting a spring-like pendulum piece
Further, a through hole 12F for venting air with a screw hole is provided in the upper portion without the semi-cylindrical portion 12D.

The spring plate 13, the magnet holder 14, and the spacer 15 constitute the spring-like pendulum piece 2 shown in FIG.
Place a holding plate 16 made of a brass agent in a horizontally-long rectangular shape of about m and screw 17 on the vertical side y of the semi-cylindrical portion 12D of the sealing lid 12.
It is fixed by assembling.

The assembled state is such that the vertical side surface y is shifted from the center position of the sealing lid 12 by half the thickness of the spring plate 13 so that the center of the spring plate 13 in the thickness direction is at the center of the inclination angle sensor 200. It is.

The spring plate 13 is made of a phosphor bronze plate having a thickness of about 0.08 mm, and has a vertically long rectangular shape with a central portion removed.
As shown in FIG. 9, both sides of the strip are formed as spring pendulum portions 13A, and a rectangular notch portion 13B for hooking a magnet holder 14 described below is provided below, and the mounting screw 17 is provided above. Is provided with an assembling hole 13C.

The magnet holder 14 is a holding seat for a magnet body made of brass material and, as shown in FIG. 10, is formed of a horizontally-long rectangular body having a thickness of about 4 mm, and is formed on both sides and a lower side at the center position in the thickness direction. Spring plate 13
A slit groove 14A having a width of about 0.5 mm for inserting the rectangular notch portion 13B is provided, and notches 14B and 14C for fixing magnets 18A and 18B to be described later are provided on both sides in the center in the lower thickness direction. .

The spacer 15 is a holding body of the magnet holder 14 made of brass material, and is formed in an upward U-shaped body as shown in FIG.
The outside has the same size as the spring plate 13, and the inside cutout 14A is shaped to be inserted into the slit groove 14A of the magnet holder 14.

The thickness of the spacer 15 depends on the width of the slit groove
Approximately 1/2 of the dimension minus the thickness of 3, that is, about 0.2 mm, press the thickness direction of the spring plate 13 from both sides, insert it between the spring plate 13 and the magnet holder 14, and bond Fix it.

The magnets 18A and 18B constitute the magnet body 3 shown in FIG. 1 and are made of a cylindrical ferrite magnet. As shown in FIG. 12, a magnet having a diameter of about 3 mm and a height of about 3 mm has a magnetic polarity reversed. And fixed to the notches 14B and 14C on both sides of the magnet holder 14 by adhesive, so that the spring plate 13, the pendulum 14, and the spacer 15
The magnet body is arranged at the lowermost end of the spring-shaped pendulum piece configured as described above.

Then, the one in which the sealing lid 12 and the O-ring packing 19 are integrally assembled is inserted from the upper opening of the case 1, and is then fixed and fixed with screws 20 at the upper end of the case 1. After the silicone oil 21 corresponding to the braking liquid 5 shown in FIG. 1 is injected, it is closed with a screw 22 having a packing seat.

Further, the gap G1 between the lower ends of the magnets 18A and 18B and the upper surface of the bottom portion a of the case 1 is a narrow interval of about 1 mm or less, and even when the magnets 18A and 18B are swung for the required detection of the inclination angle. , So that the lower end does not contact the bottom part a.

The circuit wiring board 31 is a part of the printed wiring board 7 shown in FIG. 1, and mainly has circuit elements arranged and connected in a tilt angle correction control circuit part.

The Hall element IC32 constitutes the Hall element IC4 in FIG. 1, and is a commercially available DN835 type Hall IC (linear type).
Is used.

Then, the case 1 is inserted into the mounting hole 31A provided in the circuit wiring board 31.
And is integrally assembled and fixed with a screw 31B with a spring washer.

The mounting hole 31A is located at the center in the thickness direction of the spring plate 13, that is,
The hole is provided at a position where the center of the case 1 and the detection center of the Hall element IC 32 coincide with each other, and has a size large enough for the diameter of the screw 31B. The relative position between the Hall element IC32 and the case 1 can be adjusted based on the detection output of the Hall element IC32.

The gap G2 between the upper surface of the Hall element IC32 and the lower surface of the bottom portion a of the case 1 is set to be as small as about 0.5 mm.

(Deformation implementation)

The present invention can be modified and implemented as follows.

(1) At least the bottom portion a of the closed container 1 is formed of a non-magnetic material, and the other portions are formed of an appropriate material.
Is formed outside the bottom portion a.

(2) In the structure shown in FIG.
It is assumed that the Hall element IC4 is simply fixed to the outer surface of the bottom part a.

(3) In FIG. 3, the Hall element IC4 is
In the same manner as in the figure, it is fixed to the outer surface of the bottom part a.

(4) The magnets in FIG. 12 are arranged such that the two magnets oppose each other with the same magnetic polarity as shown in FIG. 13 or the magnetic polarities are arranged side by side as shown in FIG. Thus, it is possible to appropriately obtain a detection output from the Hall element IC with respect to a required change in the detection tilt angle.

(5) The magnet body is formed in an appropriate shape such as a square pillar, a rectangular pillar, or the like, or is formed by one magnet.

Further, the holding of the magnet body is changed to, for example, directly attaching the magnet body to the spring-like pendulum piece without using the magnet holder.

(6) Cut out key points around the cavity b so that the relationship between the Hall element IC and the bottom a can be seen from the outside,
Or, as shown in Fig. 15, support
By providing and supporting 35, a space corresponding to the hollow portion is formed.

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

(8) Change the hollow in the center of the spring plate 13 to an appropriate shape,
Alternatively, the material is changed to an appropriate material such as blue-milled stainless steel.

〔The invention's effect〕

According to the present invention, as described above, the pendulum portion of the pendulum magnet is formed of a spring-like pendulum piece made of a thin leaf spring, and
Since the upper part is fixed, there is no place to be worn over time, and the fluctuation of the magnet body and the change of the inclination angle are always kept constant, so that a long-term detection error may occur. In addition, vibrations that are not the object of detection and excessive deflection due to sudden changes in the inclination angle are damped by the spring plate-shaped surface of the pendulum due to the liquid filled in the closed container. Excessive swinging due to a change in the inclination angle can be prevented.

In addition, the mounting of the Hall element IC as the detection element
Because the pendulum magnet is attached to the outside of the sealed container or to a separate component, it is easy to adjust the magnet-corresponding position during the manufacture of the Hall element IC and replace it badly during maintenance, regardless of the component of the pendulum magnet. There are features such as being able to do.

[Brief description of the drawings]

FIGS. 1 and 2 are functional configuration diagrams of a basic configuration, FIGS. 3 and 4 are functional configuration diagrams of a modified configuration, and FIGS.
5 (A), 5 (B), and 5 (C) are specific configuration diagrams. FIG. 5 (A) is a front partial longitudinal sectional view, FIG. 5 (B) is a side partial longitudinal sectional view, and FIG. 5 (C) is a perspective view of essential parts of the bottom surface, FIG. 6 is a perspective partial cross-sectional view of the specific structure, FIGS. 7 to 11 are component diagrams of the specific structure, FIG. FIGS. 9 to 11 are perspective views, FIGS. 12 to 14 are layout diagrams of magnet bodies, FIG.
FIG. 17 is a functional configuration diagram of a conventional basic configuration, and FIG. 18 is a perspective view of a main portion of a conventional specific configuration. DESCRIPTION OF SYMBOLS 1 ... Closed container 2 ... Spring-shaped pendulum piece 3 ... Magnet body 4 ... Hall element IC 5 ... Liquid 6 ... Lid 7 ... Printed wiring board 8 ... Fixing band 11 ... Case 12 ... Closed lid 13 ... Spring plate 14 ... Magnet Holder 15 ... Spacer 16 ... Holding plate 17 ... Screw 18A / B ... Magnet 19 ... O-ring packing 20 ... Screw 21 ... Silicon oil 31 ... Printed wiring board 32 ... Hall element IC a ... Bottom part b ... Cavity part

Claims (3)

(57) [Claims] 1. A case in which at least a seat portion is made of a non-magnetic material, a sealing lid for closing an upper end of the case, a thin spring plate suspended in the case with an upper end fixed to a bottom surface of the sealing lid. A plurality of magnets suspended along the plate surface of the spring plate to form a magnetic field outside the bottom of the case; provided on the outside of the bottom of the case to detect the momentum of the magnet An inclination angle sensor, comprising: a Hall element IC that performs the braking operation; and a braking liquid that is filled in the case and brakes the movement of the spring-like pendulum piece and the magnet. 2. The tilt angle sensor according to claim 1, wherein the plurality of magnets are attached along the plate surface of the spring plate with their side surfaces facing each other. 3. The printed circuit board according to claim 1, wherein the Hall element IC is mounted on a printed circuit board, and the printed circuit board is fixed to the outside of the bottom of the case.
The tilt angle sensor according to any one of the preceding claims.