Adjustable diaphragm, camera module, and electronic device

Patent metadata

Field	Value
Publication number	US-12566356-B2
Application number	US-202318393594-A
Country	US
Kind code	B2
Filing date	Dec 21, 2023
Priority date	Sep 20, 2023
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

An adjustable diaphragm is disclosed. At least one light-shielding blade is movably fixed through cooperation of a blade supporting ring and a blade driving ring, an electromagnetic driving assembly drives, by using Lorentz force between driving magnet and a driving coil, a driving rod to rotate relative to a base, and the driving rod is slidably connected to the blade driving ring, to drive the blade driving ring to rotate, thereby driving, by using the blade driving ring, the light-shielding blade to rotate to block or expose a lens of a camera module. In this way, a diaphragm part and the electromagnetic driving assembly are separated from the lens, a counterweight of the camera module can be optimized, and a burden on an autofocus mechanism is reduced. In the present disclosure, a camera module and an electronic device are further disclosed.

First claim

What is claimed is:

1 . An adjustable diaphragm, applied to a camera module, comprising:
at least one light-shielding blade; a blade supporting ring, wherein the at least one light-shielding blade is rotatably fixed on the blade supporting ring; a blade driving ring, coaxial with the blade supporting ring and fixed on an object side of the blade supporting ring, wherein the blade driving ring is rotatable relative to the blade supporting ring, and the at least one light-shielding blade is slidably connected to the blade driving ring; and an electromagnetic driving assembly, including a base, a driving magnet, a driving rod and a driving coil, wherein the driving magnet is fixed on the base, the driving rod is rotatably fixed on the base, the driving coil is fixed on the driving rod and is arranged relative to the driving magnet, and the driving rod is movably connected to the blade driving ring; and wherein the driving magnet drives, in response to the driving coil being energized, the driving coil to drive the driving rod to rotate, and the driving rod drives the blade driving ring to rotate to drive the at least one light-shielding blade to block or expose a lens of the camera module; wherein the driving magnet includes a first sub-magnet and a second sub-magnet; wherein the first sub-magnet and the second sub-magnet are arranged at an angular interval, and polarities of magnetic poles that are of the first sub-magnet and the second sub-magnet and are adjacent to the blade supporting ring are different; and wherein the driving coil, when energized, is subjected to force in a same direction in a magnetic field of the first sub-magnet and a magnetic field of the second sub-magnet to drive the driving rod to rotate.

2 . The adjustable diaphragm according to claim 1 , wherein the driving rod includes a mounting portion and two driving arms fixedly connected to the mounting portion;
the mounting portion is rotatably fixed on the base, and the driving coil is fixed on the mounting portion; the two driving arms are arranged at intervals and form a driving slot; and the blade driving ring includes a driving ring portion and a driving shaft fixedly connected to the driving ring portion, and the driving shaft slidably extends into the driving slot.

3 . The adjustable diaphragm according to claim 2 , further comprising a position detection element, arranged on the mounting portion, wherein the position detection element detects a rotation angle of the blade driving ring by detecting a relative position of the driving magnet.

4 . The adjustable diaphragm according to claim 3 , further comprising a flexible printed circuit, fixed on the mounting portion and located between the mounting portion and the driving coil, wherein the flexible printed circuit is electrically connected to the driving coil and the position detection element.

5 . The adjustable diaphragm according to claim 2 , wherein the blade supporting ring includes a supporting ring portion and a side wall extending from the supporting ring portion to the blade driving ring, wherein the side wall extends along a circumferential direction of the supporting ring portion;
the side wall has a circular arc-shaped notch; and the driving ring includes a driving ring portion and a driving shaft fixedly connected to the driving ring portion, the driving ring portion is accommodated in a space enclosed by the side wall and is arranged relative to the supporting ring portion, and the driving shaft extends to a periphery of the side wall through the circular arc-shaped notch and is bent and extends toward the two driving arms.

6 . The adjustable diaphragm according to claim 5 , further comprising an arc-shaped positioning member, arranged in the space enclosed by the side wall and located on a side of the driving ring portion facing away from the supporting ring portion, wherein the arc-shaped positioning member is configured to fix the driving ring portion in an axial direction of the driving ring portion.

7 . The adjustable diaphragm according to claim 6 , wherein a positioning slot extending circumferentially is provided on an inner wall surface of the side wall, and the arc-shaped positioning member is partially embedded in the positioning slot.

8 . The adjustable diaphragm according to claim 2 , further comprising a closed magnet yoke, arranged on the mounting portion and configured to form a closed magnetic field with the driving magnet.

9 . The adjustable diaphragm according to claim 2 , wherein side walls that are of the two driving arms and are opposite to each other are both arranged as circular arc side walls protruding outward, and the driving shaft is cylindrical.

10 . A camera module, comprising a lens, an autofocus mechanism, and an adjustable diaphragm;
wherein the adjustable diaphragm includes: at least one light-shielding blade; a blade supporting ring, wherein the at least one light-shielding blade is rotatably fixed on the blade supporting ring; a blade driving ring, coaxial with the blade supporting ring and fixed on an object side of the blade supporting ring, wherein the blade driving ring is rotatable relative to the blade supporting ring, and the at least one light-shielding blade is slidably connected to the blade driving ring; and an electromagnetic driving assembly, including a base, a driving magnet, a driving rod and a driving coil, wherein the driving magnet is fixed on the base, the driving rod is rotatably fixed on the base, the driving coil is fixed on the driving rod and is arranged relative to the driving magnet, and the driving rod is movably connected to the blade driving ring; and wherein the driving magnet drives, in response to the driving coil being energized, the driving coil to drive the driving rod to rotate, and the driving rod drives the blade driving ring to rotate to drive the at least one light-shielding blade to block or expose a lens of the camera module; the autofocus mechanism includes a housing accommodating the lens, the adjustable diaphragm is fixed on the housing, and the blade supporting ring of the adjustable diaphragm is located on an object side of the lens.

11 . The camera module according to claim 10 , wherein the driving magnet includes a first sub-magnet and a second sub-magnet;
wherein the first sub-magnet and the second sub-magnet are arranged at an angular interval, and polarities of magnetic poles that are of the first sub-magnet and the second sub-magnet and are adjacent to the blade supporting ring are different; and wherein the driving coil, when energized, is subjected to force in a same direction in a magnetic field of the first sub-magnet and a magnetic field of the second sub-magnet to drive the driving rod to rotate.

12 . The camera module according to claim 10 , wherein the driving rod includes a mounting portion and two driving arms fixedly connected to the mounting portion;
the mounting portion is rotatably fixed on the base, and the driving coil is fixed on the mounting portion; the two driving arms are arranged at intervals and form a driving slot; and the blade driving ring includes a driving ring portion and a driving shaft fixedly connected to the driving ring portion, and the driving shaft slidably extends into the driving slot.

13 . The camera module according to claim 12 , the adjustable diaphragm further includes a position detection element, arranged on the mounting portion, wherein the position detection element detects a rotation angle of the blade driving ring by detecting a relative position of the driving magnet.

14 . The camera module according to claim

Assignees

• Aac Optics Solutions Pte Ltd

Inventors

• Iwasaki Takashi
• Shikama Kazuo

Classifications

• G03B17/12

  with means for supporting objectives, supplementary lenses, filters, masks, or turrets · CPC title

• G03B30/00

  Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles · CPC title

• G03B9/06 Primary

  Two or more co-operating pivoted blades, e.g. iris type (shutters functioning as diaphragms by limiting extent of opening movement G03B9/08) · CPC title