Control device for vibration generation device, electronic apparatus, and method of controlling vibration generation

An electronic apparatus comprising:

• a housing;
• a vibration generation device disposed in the housing and including a stator, and a rotor rotatable around a predetermined axis with respect to the stator and having a weight having a gravity center at a position shifted from the predetermined axis;
• and
• a control section disposed in the housing and configured to control a start-up period maximum voltage value, which is a maximum voltage value of a drive signal to be applied to the vibration generation device in a start-up period, to become larger than a steady operation period voltage value, which is a voltage value of the drive signal to be applied to the vibration generation device in a steady operation period,
• wherein the control section
• controls a first application time, during which the start-up period maximum voltage value is applied to the vibration generation device, to become shorter than a second application time, during which the steady operation period voltage value is applied to the vibration generation device,
• selects at least one of a plurality of voltage values as the steady operation period voltage value, and sets the first application time and the second application time based on the steady operation period voltage value selected, and
• shorts both ends of the vibration generation device for a predetermined period of time, either
• (1) at a same time of making the vibration generation device perform a reverse rotation operation in succession to the steady operation, or
• (2) before making the vibration generation device perform a reverse rotation operation in succession to the steady operation, or
• (3) after making the vibration generation device perform a reverse rotation operation in succession to the steady operation.

A method of controlling rotation of a vibration generation device which includes a stator, and a rotor rotatable around a predetermined axis with respect to the stator and having a weight having a gravity center at a position shifted from the predetermined axis, the method comprising:

• controlling a start-up period maximum voltage value, which is a maximum voltage value of a drive signal to be applied to the vibration generation device in a start-up period, to become larger than a steady operation period voltage value, which is a voltage value of the drive signal to be applied to the vibration generation device in a steady operation period;
• controlling a first application time, during which the start-up period maximum voltage value is applied to the vibration generation device, to become shorter than a second application time, during which the steady operation period voltage value is applied to the vibration generation device;
• selecting at least one of a plurality of voltage values as the steady operation period voltage value;
• and
• setting the first application time and the second application time based on the steady operation period voltage value selected;
• and
• shorting both ends of the vibration generation device for a predetermined period of time, either
• (1) at a same time of making the vibration generation device perform a reverse rotation operation in succession to the steady operation, or
• (2) before making the vibration generation device perform a reverse rotation operation in succession to the steady operation, or
• (3) after making the vibration generation device perform a reverse rotation operation in succession to the steady operation.