The present invention relates to a built-in flash mechanism that will automatically pop up when the illumination is insufficient or it is manually switched on. This invention comprises a built-in flash, a one-way electromagnetic valve, a spring that will switch the flash on when there is no magnetic force from the electromagnetic valve, a shaft with two ends, where a first end is connected to the spring and react to the motion of the spring and a second end is a clip used to withhold the flash, a buckle clipped by the clip when the flash is shut, and a pusher used to push the shaft when the flash is being pressed into the close status.
1. A flash device comprising:
a flash unit;
an electromagnetic valve;
a spring for unfolding said flash unit out;
a single shaft with two ends, a first end connected to said spring and movable to the motion of said spring, and a second end as a clip used to withhold said flash unit;
a buckle clipped by said clip when said flash unit is shut; and
a pusher used to push said shaft when said flash unit is being pressed to shut,
wherein said shaft is pushed by said pusher back to a closed position along with said electromagnetic valve being charged to close said flash device.
2. The flash device of claim 1 , wherein said flash unit is a built-in flash unit.
3. The flash device of claim 1 , wherein said electromagnetic valve is a one-way electromagnetic valve.
4. The flash device of claim 1 , wherein elasticity of said spring is between a holding force and a releasing force of said electromagnetic valve.
5. The flash device of claim 4 , wherein said elasticity is the force that drives the iron core of said electromagnetic valve outwards and makes said flash unit open.
6. The flash device of claim 1 , wherein an external force is needed to press said flash unit down to close said flash unit.