Power generator, input device, and lock device with sensor

A power generator comprising

• a stationary member;
• a movable member configured to be movable in a predetermined direction between a first position and a second position with respect to the stationary member;
• an operating member configured to be movable with respect to the stationary member separately from the movable member;
• a permanent magnet configured to generate magnetic attraction to hold the movable member at each of the first position and the second position;
• a power generating unit including a mover moving in conjunction with the movable member and configured to convert kinetic energy of the mover into electrical energy;
• and
• a spring member held by the movable member and configured to transmit force from the operating member to the movable member,
• the movable member including a first holding portion and a second holding portion, which are spaced apart from each other in the predetermined direction and which are located closer to the first position and the second position, respectively,
• the movable member being configured to hold the spring member by interposing the spring member between the first holding portion and the second holding portion,
• the operating member including a first pressing portion and a second pressing portion, which are spaced apart from each other in the predetermined direction and which are located closer to the first position and the second position, respectively,
• the first pressing portion being arranged at such a position as to interpose the spring member between the first pressing portion itself and the second holding portion when the movable member is located at the first position,
• the second pressing portion being arranged at such a position as to interpose the spring member between the second pressing portion itself and the first holding portion when the movable member is located at the second position,
• the spring member being configured to, as the operating member moves in such a direction that the first pressing portion comes closer toward the second holding portion while the movable member is located at the first position, be compressed by the first pressing portion and the second holding portion and generate restoring force that causes the movable member to move toward the second position,
• the spring member being configured to, as the operating member moves in such a direction that the second pressing portion comes closer toward the first holding portion while the movable member is located at the second position, be compressed by the second pressing portion and the first holding portion and generate restoring force that causes the movable member to move toward the first position.