Patent ID: 11921417
Assignee: LARGAN PRECISION CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 51:
52. A controllable aperture stop comprising:
a light pass portion comprising a plurality of movable blades, and the plurality of movable blades together surrounding a light pass aperture;
a fixed portion having a plurality of shaft structures respectively disposed corresponding to the plurality of movable blades; and
a driving part comprising:
a rotatable element connected to the plurality of movable blades, and the rotatable element configured to drive the plurality of movable blades to rotate respectively relative to the plurality of shaft structures so as to adjust a size of the light pass aperture;
a first magnet disposed on the rotatable element;
a first coil disposed corresponding to the first magnet, the first coil located farther away from the light pass aperture than the first magnet to the light pass aperture, and the first magnet and the first coil configured to drive the rotatable element to rotate around the light pass aperture; and
an electronic component having a position sensing circuit, the electronic component disposed corresponding to the first magnet, and the electronic component located farther away from the light pass aperture than the first magnet to the light pass aperture;

wherein the fixed portion comprises a frame element, the frame element comprises a metal component and a clad component, and the metal component is insert-molded with the clad component to together form the frame element;
wherein the metal component is ferromagnetic, and the metal component and the first magnet are disposed corresponding to each other and overlap with each other in a direction parallel to a central axis of the light pass aperture;
wherein a farthest distance between the first magnet and the central axis of the light pass aperture is rm, a shortest distance between the first coil and the central axis is rc, a shortest distance between the electronic component and the central axis is rp, and the following conditions are satisfied:

0.5≤rm/rc<1; and

0.5≤rm/rp<1.