Patent ID: 8773582

Claim:
A method to achieve a precise timing of a shutter of a digital camera, which can be used also for a continuously controllable aperture comprising the following steps: (1) providing an image sensor and a lens barrel of a digital camera, one or more diaphragm shutter blades moved by at least one linear motor, wherein each linear motor comprises an iron core, a first coil wrapped around the iron core, a second coil wrapped around the iron core, and at least one magnet fastened on a device being connected to the one or more diaphragm shutter blades; (2) setting up a continuously variable desired aperture opening by moving the shutter blades, wherein the actual position and speed of the one or more shutter blades is measured and controlled by a feedback loop; (3) applying a global reset to said image sensor; and (4) capturing an image and closing totally the one or more diaphragm shutter blades, wherein exposure time is a time span between said global reset and the totally closing of the shutter blades, wherein the actual position and speed of the one or more diaphragm shutter blades is measured and controlled by said feedback loop.