Variable mechanism for mounting angle housed gyro-sensor and method of mounting variable mechanism for mounting angle

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FIELD OF THE INVENTION

The present invention relates to a method of mounting a variable mechanism for a mounting angle and to a housed gyro-sensor unit which can make a mounting angle of a housed gyro-sensor unit horizontal without reference to a mounting angle of a navigation system in a vehicle.

BACKGROUND TO THE INVENTION

Conventional methods of mounting a variable mechanism for the mounting angle of a housed gyro-sensor involve a method of fixing in a navigation system.

This type of conventional housed gyro-sensor mounted in a car navigation system is shown in FIG. 1 and FIG. 2. FIG. 1 is a schematic view of a car navigation system which has a housed gyro-sensor. FIG. 2 is a view of the state of a housed gyro-sensor when the car navigation system is mounted in an inclined position.

In FIG. 1, reference numeral 1 denotes car navigation system housed in a dashboard, 2 is a housed gyro-sensor fixed to the car navigation system. The housed gyro-sensor 2 is preferably maintained in a horizontal position with respect to the body of the vehicle. In particular, this has been necessary with respect to a gyro-sensor detecting the variable amount or absolute value of the angle of the horizontal periphery (rate).

The operation of the invention will be described below.

Since the housed gyro-sensor unit device 2 is fixed to the car navigation system 1, it has been necessary to choose a position at which it is possible to place at car navigation system 1 horizontally when mounting the car navigation system 1 in the vehicle body in order to hold the housed gyro-sensor in a horizontal position with respect to the vehicle body.

Since a method of mounting a conventional variable mechanism for a mounting angle of a housed gyro-sensor is arranged as outlined above, when the car navigation system 1 is not housed horizontally with respect to the vehicle body, that is to say, when the housed gyro-sensor is not housed horizontally with respect to the vehicle body, the problem of reduced accuracy in the housed gyro-sensor 2 has arisen since the housed gyro-sensor 2 must be used in a sloping position.

The present invention proposed to solve the above problems and has the object of providing of a variable mechanism for a mounting angle of a housed gyro-sensor and a method of mounting said mechanism. When a housed gyro-sensor 2 is mounted in a car navigation system body, the variable mechanism of the present invention can regulate the mounting angle of the housed gyro-sensor 2 without reference to a mounting angle of a car navigation system when mounted in a vehicle body and thus can be used in an ideal state.

The present invention has the further object of providing a method of mounting a variable mechanism for the mounting angle of a housed gyro-sensor in which horizontal adjustments are simplified.

The present invention has the further object of providing a variable mechanism for the mounting angle of a housed gyro-sensor and a method of mounting said mechanism in which it is not necessary to regulate the horizontal position manually.

The present invention has the further object of providing a variable mechanism for the mounting angle of a housed gyro-sensor and a method of mounting said mechanism in which an acceleration or deceleration G generated when the vehicle is running can be prevented from affecting the variable mechanism of the housed gyro-sensor.

DISCLOSURE OF THE INVENTION

The variable mechanism of the housed gyro-sensor according to a first aspect of the present invention is housed in a car navigation system and supports a housed gyro-sensor horizontally with respect to the vehicle body. The housed gyro-sensor detects an amount of variation or an absolute value of an angle of the horizontal periphery in the vehicle body.

In this way, it is possible to use the housed gyro-sensor in an ideal state without any reductions in accuracy.

The variable mechanism of the housed gyro-sensor according to a second aspect of the present invention is supported to move with respect to the housing of a car navigation system main body and fixes a housed gyro-sensor at an arbitrary position or a fixed position depending on the mounting angle of the car navigation main body.

In this way, it is possible to obtain the same effect as that of the first aspect of the invention.

The variable mechanism of the housed gyro-sensor according to a third aspect of the present invention forms a mounting hole in the housing of the car navigation system and supports a rotation plate, which houses the housed gyro-sensor, to rotate freely with respect to a pitch axis of the mounting hole.

In this way, it is possible to regulate the horizontal orientation of the housed gyro-sensor with a relatively simple moveable mechanism and it is possible to obtain the same effect as that of the first aspect of the invention.

The variable mechanism of the housed gyro-sensor according to a fourth aspect of the present invention forms a mounting hole in the housing of the car navigation system main body and a guiding groove along the circular periphery of the mounting hole. A hole for a connecting pin is formed at a position, corresponding to the guiding groove, on the rotation plate which houses the housed gyro-sensor. The variable mechanism is supported to rotate freely with respect to the direction of pitch of the mounting hole and is fixed by a connection pin which pierces both the connection pinhole and the guiding groove.

In this way, it is possible to obtain the same effect as that of the first aspect of the invention and it is possible to prevent errors in the position of the horizontal axis of the rotation plate due to vibrations from the vehicle body.

The variable mechanism of the housed gyro-sensor according a fifth aspect of the present invention forms a mounting hole in the housing of the car navigation system main body and a plurality of notches in the circular section. The rotation plate which houses the housed gyro-sensor is supported to rotate freely with respect to a pitch axis of the mounting hole and is slidably supported on the housing of the car navigation main body. A rotation plate stopper engages with a notch due to the pressing force of a spring member and prevents the rotation of the rotation plate.

In this way, it is possible to obtain the same effect as that of the first aspect of the invention and it is possible to house a gyro-sensor purchased by the user on the market easily in the vehicle if the angular interval of the notch is formed to fit the type of vehicle.

The variable mechanism of the housed gyro-sensor according to a sixth aspect of the present invention supports a rotation plate, which houses the housed gyro-sensor, free to rotate with respect to the pitch axial direction of the mounting hole formed in the housing of the car navigation system main body. The rotation plate stopper which is slidably supported in the housing of the car navigation system main body is adapted to abut with the circular section of the rotation plate by a spring member which presses in the direction of the rotation plate thus preventing the rotation of the rotation plate.

In this way it is possible to obtain the same effect as that of the first aspect of the invention and it is possible to perform minute adjustments.

The variable mechanism of the housed gyro-sensor according to a seventh aspect of the present invention is supported to move freely with respect to the housing of a car navigation main body and horizontally supports a housed gyro-sensor with respect to a vehicle body without reference to the angle of mounting of a car navigation system main body.

In this way. it is unnecessary to regulate manually and it is possible to maintain the same level of accuracy as when the housed gyro-sensor is mounted horizontally in the normal manner.

The variable mechanism of the housed gyro-sensor according to an eighth aspect of the present invention engages a spherical section which is provided on the end of an arm which extends from the housed gyro-sensor with a retaining indentation in the housing of the car navigation system main body.

In this way, it is possible to obtain the same effect as that of the seventh aspect of the invention.

The variable mechanism of the housed gyro-sensor according to a ninth aspect of the present invention supports a rotation plate disposing a balancer below the housed gyro-sensor to rotate freely with respect to a direction of a pitch axis of the mounting hole formed on the housing of the car navigation system main body.

In this way, it is possible to obtain the same effect as that of the seventh aspect of the invention, it is unnecessary to regulate manually and it is possible to maintain the same level of accuracy as when the housed gyro-sensor is mounted horizontally in the normal manner.

The variable mechanism of the housed gyro-sensor according to a tenth aspect of the present invention supports a damper having contacting ends which connect with the rotation plate in the housing of the car navigation system main body. Although a rapid rotation force of the rotation plate is absorbed, a slight rotation force of the rotation plate is not absorbed.

In this way, it is possible to obtain the same effect as that of the seventh aspect of the invention, and mounting angle of the variable mechanism of the mounting angle of a housed gyro-sensor can be prevented from rapid variation.

The variable mechanism of the housed gyro-sensor according to an eleventh aspect of the present invention is provided with an inclination detection mechanism on the housing of the car navigation system main body. The inclination detection mechanism detects an inclination of the housed gyro-sensor and corrects an output value from the housed gyro-sensor depending on the inclination of the car navigation system main body to a value when the housed gyro-sensor is disposed horizontally.

In this way, even when the main body of the car navigation system is housed in a non-horizontal state with respect to the vehicle body, it is possible to maintain the same level of accuracy as when the housed gyro-sensor is normally housed in a horizontal manner.

The method of mounting the housed gyro-sensor according to a twelfth aspect of the present invention entails the steps of housing the mechanism in the car navigation system and supporting the housed gyro-sensor which detects the amount of variation or the absolute value of the angle of the horizontal periphery in the vehicle body horizontally with respect to the vehicle body.

In this way, it is possible for the housed gyro-sensor to be used in an ideal state without any reduction in accuracy.

The method of mounting the housed gyro-sensor according to a thirteenth aspect of the present invention entails the steps of supporting the mechanism to move freely in the housing of the car navigation system and fixing the housed gyro-sensor at a fixed position or an arbitrary position depending on the angle of the mounting of the car navigation system main body.

In this way, it is possible to obtain the same effect as that of the twelfth aspect of the invention.

The method of mounting the housed gyro-sensor according to a fourteenth aspect of the present invention entails the steps of supporting the mechanism to move freely with respect to the housing of the car navigation system and supporting the housed gyro-sensor horizontally with respect to the vehicle without reference to the mounting angle of the car navigation system main body.

In such a way, it is possible to avoid making adjustments manually and it is possible to maintain the same level of accuracy as when the housed gyro-sensor is normally mounted horizontally.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of a car navigation system having a housed gyro-sensor.

FIG. 2 is a view of the state of the housed gyro-sensor when the car navigation system as shown in FIG. 1 is housed in an inclined state.

FIG. 3 is a lateral view of the car navigation system housing a variable mechanism for the mounting angle of the housed gyro-sensor according to the first embodiment of the present invention.

FIG. 4 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state in a first embodiment of the present invention.

FIG. 5 is a front view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state in a first embodiment of the present invention.

FIG. 6 is an perspective view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a second embodiment of the present invention.

FIG. 7 is a lateral view of the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a second embodiment of the present invention.

FIG. 8 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state in a second embodiment of the present invention.

FIG. 9 is a perspective view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a third embodiment of the present invention.

FIG. 10 is a lateral view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a third embodiment of the present invention.

FIG. 11 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state in a third embodiment of the present invention.

FIG. 12 is a view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a fourth embodiment of the present invention.

FIG. 13 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side raised in a fourth embodiment of the present invention.

FIG. 14 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side depressed in a fourth embodiment of the present invention.

FIG. 15 is a view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a fifth embodiment of the present invention.

FIG. 16 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side raised in a fifth embodiment of the present invention.

FIG. 17 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side depressed in a fifth embodiment of the present invention.

FIG. 18 is a perspective view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a sixth embodiment of the present invention.

FIG. 19 is a lateral and rear view of a variable mechanism for the angle of mounting a housed gyro-sensor in a sixth embodiment of the present invention.

FIG. 20 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side depressed in a sixth embodiment of the present invention.

FIG. 21 is a view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a seventh embodiment of the present invention.

FIG. 22 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side raised in a seventh embodiment of the present invention.

FIG. 23 is a view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in an eighth embodiment of the present invention.

PREFERRED EMBODIMENTS OF THE INVENTION

In order to describe the invention in greater detail, the preferred embodiments will be outlined below with reference to the accompanying figures.

Embodiment 1

FIG. 3 is a lateral view of the car navigation system housing a variable mechanism for the mounting angle of the housed gyro-sensor according to the first embodiment of the present invention. FIG. 4 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state in a first embodiment of the present invention. FIG. 5 is a front view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state in a first embodiment of the present invention. In the figures, reference numeral 21 denotes a car navigation system, 22 is a displaceable mechanism (variable mechanism for mounting angle) comprised of a retaining indentation 23 which is fixed to the car navigation system 21 and a spherical section 32 of the housed gyro-sensor 31, 23 is a retaining indentation which holds the spherical section 32 of the housed gyro-sensor 31 so as to move freely. 31 is a housed gyro-sensor on the upper section of which a spherical section 32 is formed through the arm and which detects a rate bearing.

The operation of the invention will be described below.

In a conventional housed gyro-sensor 2 in a car navigation system 1 as shown in FIG. 1 and FIG. 2, when the car navigation system 1 is not mounted horizontally with respect to the vehicle body, the mounting angle of the housed gyro-sensor 2 is also not horizontal with respect to the vehicle body as the housed gyro-sensor 2 is fixed to the car navigation system 1.

However the housed gyro-sensor 31 of the first embodiment of the present invention is held to be freely movable by the retaining indentation 23 of the variable mechanism 22 through the spherical section 32. In this way, as shown in FIG. 4 and FIG. 5, even when the main body of the car navigation system 21 is not housed horizontally with respect to the vehicle body, it is possible to hold the housed gyro-sensor 31 horizontally with respect to the vehicle body.

As shown above, according to the first embodiment, the angle of holding the housed gyro-sensor 31 does not depend on the mounting angle of the car navigation system 21 and can be maintained horizontally with respect to the vehicle body. Thus it is possible to maintain a fixed accuracy of the stored gyro-sensor 31.

Embodiment 2

FIG. 6 is an perspective view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a second embodiment of the present invention. FIG. 7 is a lateral view of the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a second embodiment of the present invention. FIG. 8 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state in a second embodiment of the present invention. In the figures, those elements which are the same or similar to those in Embodiment 1 are designated by the same numerals and will not be explained further. Reference numeral 24 is a mounting hole (the variable mechanism for mounting angle) which is formed on the housing on the side face of the car navigation system 21. 33 is a rotation plate (the variable mechanism for mounting angle) which is held free to rotate with respect to the pitch axial direction of the mounting hole 24. The housed gyro-sensor 31 is housed on an inner side of the rotation plate 33.

The operation of the invention will be described below.

The housed gyro-sensor 31 is mounted so that it is housed inside the rotation plate 33 and can rotate in the direction of the pitch axis about an axis of the mounting hole 24 formed on the housing on the inner face of the car navigation system 21. In this way, as shown in FIG. 8, even when the main body of the car navigation system 21 is housed in a state which is not horizontal to the vehicle, it is possible to regulate horizontally the mounting angle of the housed gyro-sensor 31 with respect to the vehicle. At this time, in order to realize how many times the rotation plate 33 needs to be rotated, standards for angle settings may be provided by directly printing the name of the vehicle type on an outer face of the rotation plate 33 or by printing the major angles.

In particular, with reference to the vehicle mounted car navigation system 21, when the roll axis of the housing of the car navigation system 21 is inclined, mounting the housing of the car navigation system 21 on the vehicle by inclining the roll axis is impossible since the control panel 25 which is provided on the front face diverges to the right and laterally. Thus it is only possible to adapt the present invention to the regulation of inclination in the pitch axis of the housing of the car navigation system.

As shown above, according to the second embodiment, it is possible to regulate the horizontal orientation of the housed gyro-sensor 31 by a relatively simple movable mechanism.

Embodiment 3

FIG. 9 is an inclined view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a third embodiment of the present invention. FIG. 10 is a lateral view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a third embodiment of the present invention. FIG. 11 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state in a third embodiment of the present invention. In the figures, those elements which are the same or similar to those in Embodiment 1 and Embodiment 2 are designated by the same numerals and will not be explained further. 25 is a guiding groove (variable mechanism for mounting angle) which is formed along the periphery of the mounting hole 24. 34 is at connecting pinhole (variable mechanism for mounting angle) which is formed on the rotation plate 33. 35 is a connecting pin (variable mechanism for mounting angle) which passes through the guiding groove 25 and the connecting pinhole 34 and which guides the rotation plate 33 through a fixed angle along the guiding groove 25, 36 is a nut which retains the connecting pin 35 on the car navigation system 21.

The operation of the invention will be described below.

The housed gyro-sensor 31 is housed on an inner side the rotation plate 33 and is inserted into the mounting hole 24 formed on the housing on the inner face of the car navigation system 21. As shown in FIG. 11 when the main body of the car navigation system 21 is housed in a position which is not horizontal with respect to the vehicle, the rotation plate 33 is rotated depending on the angle of inclination of the car navigation system and held so that the horizontal axis of the housed gyro-sensor 31 is horizontal to the vehicle. Thereafter the connecting pin 35 is inserted into the connecting pinhole 34 of the rotation plate 33 and is fixed to the housing on the inner face of the car navigation system 21 by a nut 36.

As shown above according to Embodiment 3, it is possible to perform the horizontal regulation of the housed gyro-sensor 31 with a relatively simple mechanism and it is possible to prevent errors in the position of the horizontal axis of the rotation plate 33 due to vibrations from the vehicle body.

Embodiment 4

FIG. 12 is a view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a fourth embodiment of the present invention. FIG. 13 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side raised in a fourth embodiment of the present invention. FIG. 14 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side depressed in a fourth embodiment of the present invention. In the figures, those elements which are the same or similar to those in Embodiment 1 to Embodiment 3 are designated by the same numerals and will not be explained further. 41 is a rotation plate (variable mechanism for mounting angle) which forms a plurality of notches 41a. 42 is a rotation plate stopper (variable mechanism for mounting angle) which is mounted on the housing on an inner face of the car navigation system 21, the end of which is inserted into the notch 41a of the rotation plate 41 and which holds the rotation plate 41 at a fixed angle. 43 is a spring member (variable mechanism for mounting angle) which presses the rotation plate stopper 42 on the side of the rotation plate 41.

The operation of the invention will be described below.

A housed gyro-sensor is housed inside a rotation plate 41 and is inserted into the mounting hole 24 formed on the housing of the inner face of the car navigation system 21. As shown in FIG. 13 and FIG. 14, when the main body of the car navigation system 21 is not housed horizontally with respect to the vehicle body, the rotation plate 41 is rotated depending on an angle of inclination of the car navigation system and the horizontal axis of the housed gyro-sensor 31 is maintained in a horizontal position. Thereafter the end of the rotation plate stopper 42 is inserted into the notch 41a of the rotation plate 41 and the rotation plate 41 is maintained at a fixed angle. At this time, the rotation plate 41 is fixed to the housing of the inner face of the car navigation system 21.

As shown above in embodiment 4, it is possible to regulate the horizontal disposition of the housed gyro-sensor 31 with a relatively simple mechanism. If the angle interval of the notch 41a of the rotation plate 41 is formed appropriately with the type of vehicle, it is possible to easily store a gyro-sensor purchased by the user on the market in the vehicle.

Embodiment 5

FIG. 15 is a view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a fifth embodiment of the present invention. FIG. 16 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side raised in a fifth embodiment of the present invention. FIG. 17 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side depressed in a fifth embodiment of the present invention. In the figures, those elements which are the same or similar to those in Embodiment 1 to Embodiment 4 are designated by the same numerals and will not be explained further. 51 is a resisting section (variable mechanism for mounting angle) which is normally in abutment with the circular section of the rotation plate 33 and which stops the rotation plate at a fixed position by the pressure from the spring member 52 (variable mechanism for mounting angle). The rotation plate 33 can be fixed to an arbitrary position by the force of friction between the circular section of the rotation plate 33 and the resisting section 51.

The operation of the invention will be described below.

A housed gyro-sensor 31 is housed inside a rotation plate 33 and is inserted into the mounting hole 24 formed on the housing of the inner face of the car navigation system 21. As shown in FIG. 16 and FIG. 17, when the main body of the car navigation system 21 is not housed horizontally with respect to the vehicle body, the rotation plate 41 is rotated depending on an angle of inclination of the car navigation system and the horizontal axis of the housed gyro-sensor 31 is maintained in a horizontal position. Thereafter the rotation force is increased to overcome the frictional force between the circular section of the rotation plate 33 and the resisting section 51. Thus the rotation plate 33 can be maintained in an arbitrary position.

As shown above, according to embodiment 5, it is possible to horizontally adjust the housed gyro-sensor 31 by a relatively simple movable mechanism by eliminating the necessity of fixing and releasing the rotation plate 33 by the nut 36 and the connection hole at which were used in embodiment 3. At the same time, minute adjustments can be performed.

Embodiment 6

FIG. 18 is a perspective view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a sixth embodiment of the present invention. FIG. 19 is a lateral and rear view of a variable mechanism for the angle of mounting a housed gyro-sensor in a sixth embodiment of the present invention. FIG. 20 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side depressed in a sixth embodiment of the present invention. In the figures, those elements which are the same or similar to those in Embodiment 1 to Embodiment 5 are designated by the same numerals and will not be explained further. 61 is a balancer (variable mechanism for mounting angle) which is housed on an end of the rear face of the rotation plate 33 which is held free to rotate in the mounting hole 24. The rotation plate 33 is rotated by the weight of the balancer 61 and the housed gyro-sensor 31 is maintained in a normally horizontal orientation with respect to the vehicle body.

The operation of the invention will be described below.

A housed gyro-sensor 31 is housed inside a rotation plate 41 and is inserted into the mounting hole 24 formed on the housing of the inner face of the car navigation system 21. As shown in FIG. 20, when the main body of the car navigation system 21 is not housed horizontally with respect to the vehicle body, the rotation plate 33 is rotated depending on an angle of inclination of the car navigation system and the horizontal axis of the housed gyro-sensor 31 is automatically maintained in a horizontal position by the balancer 61 provided on the lower face of the housed gyro-sensor 31.

As shown above, according to embodiment 6, it is not necessary to adjust the variable mechanism for the mounting angle of the housed gyro-sensor 31 manually. Furthermore the housed gyro-sensor can maintain the same level of accuracy as when normally mounted horizontally.

Embodiment 7

FIG. 21 is a view showing a car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor in a seventh embodiment of the present invention. FIG. 22 is a lateral view of the housed gyro-sensor when the car navigation system which houses a variable mechanism for the angle of mounting a housed gyro-sensor is housed in an inclined state with the right side raised in a seventh embodiment of the present invention. In the figures, those elements which are the same or similar to those in Embodiment 1 to Embodiment 6 are designated by the same numerals and will not be explained further. 71 is an inclination detection mechanism which detects an inclination .theta. of the housed gyro-sensor 31 which is housed in the housing of the car navigation system 21 and which corrects the output value from