Vibration generating device and manipulation feeling imparting input device using the vibration generating device
A vibration generating device has a vibration generating member that causes vibration in a vibration direction, a vibration transmitting member, and a base body. The vibration generating member has a first yoke and a second yoke spaced in the vibration direction so as to face each other, a coil that generates magnetism, and a support body that supports the first yoke. A first gap is formed between the first vibration-side opposite surface of the first yoke and the second vibration-side opposite surface of the second yoke; these surfaces face each other in the vibration direction. A second gap is formed between the first orthogonal-side opposite surface of the first yoke and the second orthogonal-side opposite surface of the second yoke; these surfaces face each other in an orthogonal direction orthogonal to the vibration direction. The first gap is narrower than the second gap.
1. A vibration generating device comprising:
a vibration generating member;
a vibration transmitting member connected to the vibration generating member; and
a base body that holds the vibration generating member,
wherein the vibration generating member includes:
a movable part operable in a first direction which is a direction of vibration, the movable part being coupled to the vibration transmitting member;
a first yoke having:
a first surface orthogonal to the first direction; and
a second surface parallel to the first direction;
a second yoke facing the first yoke, the second yoke having:
a third surface orthogonal to the first direction, the third surface facing the first surface with a first gap provided therebetween; and
a fourth surface parallel to the first direction, the fourth surface facing the second surface with a second gap provided therebetween, the first gap being narrower than the second gap;
a coil disposed in a vicinity of at least one of the first yoke and the second yoke, the coil generating magnetism; and
a support body that movably supports the first yoke such that the first yoke vibrates in the first direction.
2. The vibration generating device according to claim 1 , wherein, in an initial state in which no magnetic force is generated between the first yoke and the second yoke, an opposing area between the second surface and the fourth surface is greater than an opposing area between the first surface and the third surface.
3. The vibration generating device according to claim 1 , wherein when a magnetic attractive force is generated between the first yoke and the second yoke, an opposing area between the second surface and the fourth surface increases.
4. An input device providing a manipulation feeling, the input device comprising:
the vibration generating device according to claim 1 ; and
an input unit connected to the vibration transmitting member of the vibration generating device, the input unit including:
a manipulation surface that is manipulated by an operating body; and
a control unit that processes and outputs manipulation information inputted on the manipulation surface, vibration being provided to the operating body when the manipulation surface is manipulated.
5. The input device according to claim 4 , wherein the input unit is connected integrally to the vibration transmitting member.
6. The vibration generating device according to claim 1 , wherein the first yoke and the second yoke are made of a soft magnetic material.
7. The vibration generating device according to claim 1 , wherein the second yoke accommodates the first yoke, the second surface being an outer side surface of the first yoke, and the fourth surface being an inner side surface of the second yoke.
8. The vibration generating device according to claim 7 , wherein the first surface is a lower bottom surface of the first yoke, and the third surface is an upper bottom surface of the second yoke.
9. The vibration generating device according to claim 2 , wherein when a magnetic attractive force is generated between the first yoke and the second yoke, the opposing area between the second surface and the fourth surface increases, thereby reducing a magnetic resistance across the second gap so as to increase the magnetic attractive force between the first yoke and the second yoke across the first gap.