Thin dual-aperture zoom digital camera
A dual-aperture zoom camera comprising a Wide camera with a respective Wide lens and a Tele camera with a respective Tele lens, the Wide and Tele cameras mounted directly on a single printed circuit board, wherein the Wide and Tele lenses have respective effective focal lengths EFL W and EFL T and respective total track lengths TTL W and TTL T and wherein TTL W /EFL W >1.1 and TTL T /EFL T <1.0. Optionally, the dual-aperture zoom camera may further comprise an optical OIS controller configured to provide a compensation lens movement according to a user-defined zoom factor (ZF) and a camera tilt (CT) through LMV=CT*EFL ZF , where EFL ZF is a zoom-factor dependent effective focal length.
1. A dual-aperture zoom camera, comprising:
a) a Wide camera with a respective Wide lens and a Tele camera with a respective Tele lens, wherein the Wide and Tele lenses have respective effective focal lengths EFL W and EFL T and respective total track lengths TTL W and TTL T , and wherein TTL W /EFL W >1.1 and TTL T /EFL T <1.0;
b) an optical image stabilization (OIS) mechanism configured to provide a compensation for lens movement (LMV) of the Wide and Tele lenses according to a camera tilt (CT) input and a user-defined zoom factor (ZF), wherein LMV=CT×EFL ZF and wherein CT is a camera tilt in radians and EFL ZF is a zoom-factor dependent effective focal length in millimeters.
2. The dual-aperture zoom camera of claim 1 , wherein for ZF=1, EFL ZF =EFL W .
3. The dual-aperture zoom camera of claim 1 , wherein EFL T /EFL W =e, wherein e is in the range 1.3-2.0 and wherein for ZF=e, EFL ZF =EFL T .
4. The dual-aperture zoom camera of claim 1 , wherein EFL T /EFL W =e, wherein e is in the range 1.3-2.0 and wherein for ZF in the range 1<ZF<e, EFL ZF =ZF×EFL W .
5. The dual-aperture zoom camera of claim 1 , wherein EFL T /EFL W =e, wherein e is in the range 1.3-2.0 and wherein for ZF>e, EFL ZF =EFL T .
6. The dual-aperture zoom camera of claim 1 , wherein a ratio TTL T /TTL W is in the range 1.0-1.25.
7. The dual-aperture zoom camera of claim 1 , having a dual-aperture zoom camera height of less than 7 mm and wherein EFL T >6.1 mm.
8. The dual-aperture zoom camera of claim 1 , wherein the Tele lens comprises in order from an object side to an image side, a first lens element with positive refractive power and a second lens element with negative refractive power, wherein the first lens element has a convex object-side surface and a convex or concave image-side surface, an Abbe number greater than 50 and a focal length f 1 smaller than TTL/2, and wherein the second lens element is a meniscus lens having a convex object-side surface and an Abbe number smaller than 30.
9. A method for manufacturing a dual-aperture zoom camera comprising:
a) providing a Wide camera having a Wide lens with an effective focal length (EFL) EFL W and a total track length (TTL) TTL W ;
b) providing a Tele camera having a Tele lens with an effective focal length EFL T and a total track length TTL T , wherein TTL W /EFL W >1.1 and wherein TTL T /EFL T <1.0; and
c) configuring an optical image stabilization (OIS) controller of the dual-aperture zoom camera to compensate lens movement (LMV) of the Wide and Tele lenses according to a camera tilt (CT) input and a user-defined zoom factor (ZF); wherein LMV=CT×EFL ZF and wherein CT is in radians and EFL ZF is a zoom-factor dependent effective focal length in millimeters.
10. A method of compensating lens movement in a dual-aperture zoom camera comprising a Wide camera with a respective Wide lens and a Tele camera with a respective Tele lens, wherein the Wide and Tele lenses have respective effective focal lengths EFL W and EFL T and respective total track lengths TTL W and TTL T , the method comprising using an optical image stabilization (OIS) controller of the dual-aperture zoom camera for compensating lens movement (LMV) of the Wide and Tele lenses according to a camera tilt (CT) input and a user-defined zoom factor (ZF), wherein LMV=CT×EFL ZF and wherein CT is in radians and EFL ZF is a zoom-factor dependent effective focal length in millimeters.