Grip detection device

1. A grip detection device, comprising:

a steering wheel;

an electrostatic capacity sensor mounted on a rim of said steering wheel: and

a determination unit that determines whether a driver has gripped the steering wheel or not based on proximity detection of a human body by said electrostatic capacity sensor,

wherein

said electrostatic capacity sensor includes a plurality of electrode units comprising an electrostatic capacity detection electrode of elongated shape,

a plurality of said electrode units extend along a direction in which said rim extends, and are provided in parallel along a circumferential direction of said rim having the direction in which said rim extends as its axial center,

furthermore, in a plurality of said electrode units, at least two electrode units are commonly connected, and at least one electrode unit not commonly connected to the commonly connected two electrode units is disposed between the commonly connected two electrode units, and

said determination unit determines that the driver has gripped the steering wheel when proximity of the human body has been detected by each of at least two electrode units not commonly connected to each other,

a plurality of the electrode units are divided into at least three groups, and electrode units belonging to an identical group are commonly connected each other, and

the determination unit determines that the driver has gripped the steering wheel when proximity of the human body has been detected by one electrode unit and other electrode unit belonging to different group from the one electrode unit.

2. The grip detection device according to claim 1 , wherein the proximity of the human body is detected by the one electrode unit separately and independently from the other electrode unit belonging to the different group from the one electrode unit, and the proximity of the human body is detected by the other electrode unit separately and independently from the one electrode unit.

3. The grip detection device according to claim 1 , wherein

a plurality of said electrode units are provided in parallel along a circumferential direction of said rim, such that adjacent electrode units belong to different groups each other.

4. A grip detection device, comprising:

a steering wheel;

an electrostatic capacity sensor mounted on a rim of said steering wheel; and

a determination unit that determines whether a driver has gripped the steering wheel or not based on proximity detection of a human body by said electrostatic capacity sensor,

wherein

said electrostatic capacity sensor includes a plurality of electrode units comprising an electrostatic capacity detection electrode of elongated shape,

a plurality of said electrode units extend along a direction in which said rim extends, and are provided in parallel along a circumferential direction of said rim having the direction in which said rim extends as its axial center,

furthermore, in a plurality of said electrode units, at least two electrode units are commonly connected, and at least one electrode unit not commonly connected to the commonly connected two electrode units is disposed between the commonly connected two electrode units, and

said determination unit determines that the driver has gripped the steering wheel when proximity of the human body has been detected by each of at least two electrode units not commonly connected to each other,

a plurality of said electrode units are divided into at least three groups, and electrode units belonging to an identical group are commonly connected each other, and

said determination unit determines that the driver has gripped the steering wheel when proximity of the human body has been detected by each of at least one electrode unit of all of different groups.

5. The grip detection device according to claim 4 , wherein

a plurality of said electrode units are provided in parallel along a circumferential direction of said rim, such that adjacent electrode units belong to different groups each other.

6. A grip detection device, comprising:

a steering wheel;

an electrostatic capacity sensor mounted on a rim of said steering wheel: and

a determination unit that determines whether a driver has gripped the steering wheel or not based on proximity detection of a human body by said electrostatic capacity sensor,

wherein

said electrostatic capacity sensor includes a plurality of electrode units comprising an electrostatic capacity detection electrode of elongated shape,

a plurality of said electrode units extend along a direction in which said rim extends, and are provided in parallel along a circumferential direction of said rim having the direction in which said rim extends as its axial center,

furthermore, in a plurality of said electrode units, at least two electrode units are commonly connected, and at least one electrode unit not commonly connected to the commonly connected two electrode units is disposed between the commonly connected two electrode units, and

said determination unit determines that the driver has gripped the steering wheel when proximity of the human body has been detected by each of at least two electrode units not commonly connected to each other,

a plurality of said electrode units are divided into at least two groups, and electrode units belonging to an identical group are commonly connected each other,

said determination unit determines that the driver has gripped the steering wheel when proximity of the human body has been detected by each of one electrode unit and an electrode unit belonging to a different group from the one electrode unit,

a plurality of said electrode units are provided in parallel along a circumferential direction of said rim, such that adjacent electrode units belong to different groups each other.