JPH0526964Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to an electronic compass that is installed on a moving object such as a car and that electrically detects the earth's magnetic field and displays the direction of travel or the direction of magnetic north. be.

[Conventional technology]

Conventionally, the direction of the earth's magnetic field is detected using a flux gate type magnetic detector with a wire wound around a toroidal core, and this detection signal is processed by a processing circuit to show the direction of the earth's magnetic field or the direction of the earth's magnetic field on a display. An example of one that displays the heading direction is JP-A-56-151305.
No. or Japanese Patent Application Laid-Open No. 58-33116.

[Problem that the invention attempts to solve]

In the above-mentioned electronic azimuth type, the control circuit including the magnetic detector, signal processing circuit, etc., the display, etc. are usually specially designed to match the type of vehicle to which the device is installed due to the design of the vehicle body. Therefore, such electronic compass is generally expensive and has problems such as being extremely difficult to install on vehicle models that are not intended to be equipped with a compass.

This invention was made to solve the above-mentioned problems, and the purpose is to obtain an electronic compass that can be easily installed in all types of vehicles and is inexpensive.

[Means for solving problems]

The electronic compass according to this invention stores a magnetic detector, a control circuit, and a display in the same container, and connects the magnetic detector and the container by a connecting means to connect the x-axis, y-axis, orthogonal to each other. They are connected so that rotation angles around all axes of the z-axis can be adjusted arbitrarily.

[Effect]

The electronic compass according to this invention can maintain the correct attitude of the magnetic detector with respect to the automobile by adjusting the mounting angle between the magnetic detector and the container using the connecting means.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings. In a to c in FIGS. 1 and 2, reference numeral 1 denotes a magnetic detector for detecting earth's magnetism. Reference numeral 2 denotes a liquid crystal display panel serving as an indicator for displaying the direction, and is of a type equipped with lead terminals 2a. The display panel 2 has display patterns 2b and 2c as shown in FIG. 2a, the display pattern 2b is always displayed, and one of the eight triangular display patterns 2c is selected and displayed. Reference numeral 3 designates a reflection plate that scatters and reflects external light transmitted through the liquid crystal display panel 2. Reference numeral 4 designates a circuit board to which lead terminals 2a are soldered and on which a driving IC 5 for the display panel 2 is mounted. 6
is a circuit board that constitutes a control circuit that drives the magnetic detector 1 and displays on the display panel 2 the angle formed by the reference direction of the magnetic detector 1 and the earth's magnetism, which is obtained by processing the detection signal. , 7 are its circuit components. 8 is a jumper wire that connects the circuit boards 4 and 6; 9 is a lead wire that connects the terminal of the winding wire wound around the magnetic detector 1, particularly the toroidal core (not shown), and the circuit board 6; It has flexibility.
10 is a terminal for receiving power; 11 is a container for storing and fixing the liquid crystal display panel 2, circuit boards 4, 6, etc.; it has a circular display window 11a, and a transparent protection panel 12 is fixed to the back side of the periphery thereof; ing. Further, a circular hole 11b is provided on the top surface of the storage container 11,
An annular member 13 having an L-shaped cross section is fixed to the back surface along the circumference of the hole 11b. A shaft 15 is rotatably mounted between the holder 1b of the magnetic detector 1 and the annular member 14. A shaft 17 is rotatably mounted between the annular member 16 and the annular member 14 . The annular member 16 is slidably held between the annular member 13 and the peripheral edge of the hole 11b. Therefore, the magnetic detector 1 is rotatable in the circumferential direction of the hole 11b.

As a result, the magnetic detectors 1 are arranged perpendicularly to each other x
It can be rotated freely around the axis, y-axis, and z-axis, and is semi-fixed at a predetermined mounting angle. Further, an ordinary level 18 in which bubbles are provided in liquid is fixed to the upper part of the magnetic detector 1, and an arrow 18a indicating the reference direction of the magnetic detector 1 is formed on the upper surface of the level 18.

The electronic compass of this invention is constructed as described above, and operations such as detecting earth's magnetism and displaying the compass are the same as conventional ones, and the arrow 1 of the magnetic detector 1
Detecting the angle between the 8a direction and the geomagnetic direction,
One display pattern 2c of the liquid crystal display panel 2 corresponding to the direction in which the arrow 18a is facing is selected and displayed.

FIG. 3 is a diagram showing an example of how the electronic compass 100 shown in FIG. 1 is installed in an automobile in which the dash board 200 is inclined with respect to a horizontal plane. Therefore, even if the container 11 is installed at an angle with respect to the horizontal plane, the magnetic detector 1 can be installed horizontally. Furthermore, when installing the magnetic detector 1 horizontally, reference to the level 18 makes the installation easier and more accurate.

[Effect of idea]

As described above, according to this invention, the mounting angle of the magnetic detector and the storage container can be adjusted around all the mutually perpendicular axes, such as the x-axis, y-axis, and z-axis, by means of the connecting means. It becomes possible to maintain the magnetic detector in the correct posture regardless of the mounting posture of the storage container in a car or the like, and thereby it can be mounted on any moving body. In addition, since the magnetic detector and the display are set independently in the storage container, this also increases the degree of freedom in mounting on automobiles and the like, making it easy to mount on any moving body.

[Brief explanation of drawings]

Figure 1 is a partially cutaway perspective view of an electronic compass according to an embodiment of this invention, Figures 2 a to c are a front view, plan view, and sectional view of Figure 1, and Figure 3 is an installation of the electronic compass. It is an external view showing an example. 1...Magnetic detector, 2...Liquid crystal display panel,
4,6...Circuit board, 11...Storage container, 13,1
4, 16...Annular member, 18...Level. In addition,
In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) A magnetic detector that detects earth's magnetism, an indicator that displays the direction, and a magnetic field obtained by driving the magnetic detector and processing the detection signal. A control circuit for displaying the angle between the reference direction of the detector and the earth's magnetic field on the display, and a storage container for storing and fixing the control circuit and the display,
When a horizontal plane is formed by the x-axis, y-axis, and z-axis among mutually orthogonal x-axis, y-axis, and z-axis, the magnetic detector is supported in the storage container so that the mounting angle around all the axes can be adjusted. An electronic direction meter. (2) The electronic compass according to claim 1 of the utility model registration claim, characterized in that the magnetic detector is provided with a mark indicating its reference direction. (3) The electronic compass according to claim 1 of the utility model registration claim, characterized in that a level gauge is provided above the magnetic detector so that horizontality can be visually checked from the outside. (4) The electronic compass according to claim 3 of the utility model registration claim, characterized in that the spirit level is provided with a mark indicating the reference direction of the magnetic detector.