A movable carrier auxiliary system includes at least one optical image capturing system disposed on a movable carrier, at least one warning module, and at least one displaying device. The optical image capturing system includes an image capturing module and an operation module, and has at least one lens group including at least two lenses having refractive power. The image capturing module captures and produces an environmental image surrounding the movable carrier. The operation module electrically connected to the image capturing module detects at least one lane marking in the environmental image to generate a detecting signal. The warning module electrically connected to the operation module receives the detecting signal to determine whether a moving direction of the movable carrier deviates from a lane, and generate a warning signal when the moving direction deviates from the lane. The displaying device electrically connected to the warning module displays the warning signal.

Disclosed is an optical lens, from an object side to an image side including a first lens, a second lens and a third lens. The camera optical lens satisfies: 1.20≤f1/f≤1.80; −2.00≤f2/f≤−1.00; 0.75≤f3/f≤1.10; −6.00≤R2/R1≤−2.00; 2.20≤R4/R3≤8.00; 1.50≤d2/d4≤3.50; where f, f1, f2 and f3 denote a focal length of the camera optical lens, the first lens, the second lens and the third lens, respectively; R1, R2 denote a central curvature radius of an object-side surface and an image-side surface of the first lens, respectively; R3, R4 denote a central curvature radius of an object-side surface and an image-side surface of the second lens, respectively; d2 denotes an on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens, and d4 denotes an on-axis distance from the image-side surface of the second lens to an object-side surface of the third lens.

Disclosed is an optical lens, from an object side to an image side including a first lens, a second lens and a third lens. The camera optical lens satisfies: 1.20≤f1/f≤1.80; −2.00≤f2/f≤−1.00; 0.75≤f3/f≤1.10; −6.00≤R2/R1≤−2.00; 2.20≤R4/R3≤8.00; 1.50≤d2/d4≤3.50; where f, f1, f2 and f3 denote a focal length of the camera optical lens, the first lens, the second lens and the third lens, respectively; R1, R2 denote a central curvature radius of an object-side surface and an image-side surface of the first lens, respectively; R3, R4 denote a central curvature radius of an object-side surface and an image-side surface of the second lens, respectively; d2 denotes an on-axis distance from the image-side surface of the first lens to the object-side surface of the second lens, and d4 denotes an on-axis distance from the image-side surface of the second lens to an object-side surface of the third lens.

An imaging optical system includes three lens elements. The three lens elements, in order from an object side to an image side, are a first lens element having an object-side surface facing the object side and an image-side surface facing the image side, a second lens element having an object-side surface facing the object side and an image-side surface facing the image side, and a third lens element having an object-side surface facing the object side and an image-side surface facing the image side. The third lens element has positive refractive power, the imaging optical system has a total of three lens elements, and there are air gaps between paraxial regions of the first lens element, the second lens element and the third lens element.

A lens device includes at least one frame, at least one lens, at least one optical element and an image forming assembly. The lens is disposed in the frame and has an optical axis extending in a first direction. The optical element includes at least one non-planar surface. The light coming from an object side propagates through the lens and the non-planar surface to the image forming assembly. The lens is obtained from cutting an upper portion and a lower portion of a circular lens along planes in parallel to the first direction and a second direction.

A lens device includes at least one frame, at least one lens, at least one optical element and an image forming assembly. The lens is disposed in the frame and has an optical axis extending in a first direction. The optical element includes at least one non-planar surface. The light coming from an object side propagates through the lens and the non-planar surface to the image forming assembly. The lens is obtained from cutting an upper portion and a lower portion of a circular lens along planes in parallel to the first direction and a second direction.

A three-piece infrared single wavelength projection lens system, in order from an image side to an image source side: a stop; a first lens element with a positive refractive power having an image-side surface being convex near an optical axis and an image source-side surface being concave near the optical axis; a second lens element with a negative refractive power having an image source-side surface being concave near the optical axis; and a third lens element with a positive refractive power having an image-side surface being concave near the optical axis and an image source-side surface being convex near the optical axis. Such arrangements can provide a three-piece infrared single wavelength projection lens system with better image sensing function.

A three-piece infrared single wavelength projection lens system, in order from an image side to an image source side: a stop; a first lens element with a positive refractive power having an image-side surface being convex near an optical axis and an image source-side surface being concave near the optical axis; a second lens element with a negative refractive power having an image source-side surface being concave near the optical axis; and a third lens element with a positive refractive power having an image-side surface being concave near the optical axis and an image source-side surface being convex near the optical axis. Such arrangements can provide a three-piece infrared single wavelength projection lens system with better image sensing function.

An optical imaging system includes a lens group including at least one lens forming a first optical axis; and an optical path converter reflecting light emitted from the lens group to form an image on an imaging plane. In the optical imaging system, a maximum distance from an object side surface of a frontmost lens, disposed closest to an object side, among the lens group, to the imaging plane, in a first optical axis direction is 11.0 mm or less.

An optical imaging system includes a lens group including at least one lens forming a first optical axis; and an optical path converter reflecting light emitted from the lens group to form an image on an imaging plane. In the optical imaging system, a maximum distance from an object side surface of a frontmost lens, disposed closest to an object side, among the lens group, to the imaging plane, in a first optical axis direction is 11.0 mm or less.