| 摘要 |
PROBLEM TO BE SOLVED: To make a discharge sound at a time of generating ions unnoticeable when a quiet environment is required such as when a user sleeps.SOLUTION: When light is on and a user activates a timer, an operation of an ion generator is stopped. Since ions are not generated, no discharge sound is generated and a quiet environment is achieved. When a set time by the timer passes, the light is turned off and the operation of the ion generator is resumed, and ions are generated. |
