The wide angle optical system includes in order from a side of an object in front, a first lens group having a negative refractive power, a second lens group having a catadioptric optical element, an aperture stop, and a third lens group having a positive refractive power, and the catadioptric optical element has a first surface, a second surface, and a third surface, and the first surface has a first transmitting surface and a first reflecting surface, the second surface has a second transmitting surface and a second reflecting surface, and the third surface has a third transmitting surface, and the third transmitting surface is a side surface of a circular truncated cone, and the following conditional expressions (1), (2), and (3) are satisfied:

νp<νn  (1),

|φp|<|φn|  (2), and

90°−θk<α/2  (3).

An optical system is provided. The optical system includes a fixed unit, an actuating unit, a lens unit and a metalens. The actuating unit is connected to the fixed unit. The lens unit is adapted to be moved by the actuating unit relative to the fixed unit. The metalens is adapted to be moved between a first position and a second position relative to the lens unit. When the metalens is in the first position, the metalens is not on a light path of the lens unit. When the metalens is in the second position, the metalens is on the light path of the lens unit.

Provided is a metalens including a first metasurface including a plurality of first nanostructures disposed based on a first shape distribution, and a second metasurface spaced apart from the first metasurface at a distance greater than a central wavelength of a predetermined wavelength band, the second metasurface including a plurality of second nanostructures disposed based on a second shape distribution, wherein the metalens provides chromatic aberration for light in the predetermined wavelength band.

A portable electronic device including a main body, a camera module and a movement mechanism is provided. The main body has an accommodating groove located in the main body and exposed at a surface thereof. The camera module is disposed in the accommodating groove, and the camera module has a wide angle lens. The movement mechanism is located between the camera module and the accommodating groove, and the camera module is configured to move between a first position and a second position in the accommodating groove. When the camera module is located at the first position, an upper surface of the wide angle lens is lower than or equal to the surface of the main body. When the camera module is located at the second position, the wide angel lens is protruded out of the surface of the main body.

An imaging lens assembly includes a plurality of lens elements, wherein at least one of the lens elements is a dual molded lens element. The dual molded lens element includes a light transmitting portion and a light absorbing portion. The light transmitting portion includes an effective optical section. The light absorbing portion is located on at least one surface of an object-side surface and an image-side surface of the dual molded lens element, wherein a plastic material and a color of the light absorbing portion are different from a plastic material and a color of the light transmitting portion, and the light absorbing portion includes an opening. The opening is non-circular and disposed correspondingly to the effective optical section.

A collapsible imaging system having a compound lens and a lenslet array, which is coupled with an image sensor. The collapsible imaging system can be transitioned between the imaging and storage modes by moving compound lens elements along the optical axis and off the optical axis of the system. In the storage mode, the compound lens elements are tightly packed in a flat volume.

An imaging lens assembly includes a plurality of lens elements, wherein at least one of the lens elements is a dual molded lens element. The dual molded lens element includes a light transmitting portion and a light absorbing portion. The light transmitting portion includes an effective optical section and a first annular surface. The light absorbing portion is located on at least one surface of an object-side surface and an image-side surface of the dual molded lens element, wherein a plastic material and a color of the light absorbing portion are different from a plastic material and a color of the light transmitting portion, and the light absorbing portion includes an opening and a second annular surface. A step surface of the second annular surface is formed by the first annular surface and the second annular surface.

An aperture stop that includes a non-circular region that comprises at least one opaque region and at least one opening region; wherein each point in the at least one opening region is (a) mapped to an angle of illumination and (b) is associated with a corresponding point in the at least one opaque region that. mapped to an angle of specular reflectance from the angle of illumination mapped to the opening point.

The present disclosure relates to systems and methods that employ a mechanical method for adjusting camera field angles at a high speed. The adjustments may be synchronized to a high speed image capture process. As such, multiple frames can be captured without experiencing significant object movement or hand shake. The systems and methods may be used to capture videos and/or photo stitching, because both camera position and objects in the scene are static during the high speed image capture.

An optical imaging system (100) includes, in order from an object side to an image side, a first lens (L1) with a positive refractive power, a second lens (L2) with a refractive power, a third lens (L3) with a refractive power, and a fourth lens (L4) with a refractive power. The optical imaging system (100) further includes a stop (10) located in front of an imaging surface of the optical imaging system (100), and a first infrared filter (31) located between the first lens (L1) and the fourth lens (L4). A filter is located in the middle of the optical imaging system (100), which leaves room for shortening a back focal length and facilitates ultra-thin design.