A vibration device includes a light-transmissive body, and a vibrator to vibrate the light-transmissive body at a vibration acceleration of equal to or more than about 1.5×10.sup.5 m/s.sup.2 and equal to or less than about 8.0×10.sup.5 m/s.sup.2.

A wide-angle lens (100) includes a front group (110), an aperture (80), and a rear group (120). The front group (110) includes a first lens (10) and a second lens (20) arranged from a side (La) closest to an object to an image side (Lb). In such a wide-angle lens, to suppress an occurrence of a ghost caused by multiple reflection between a lens surface (102) of the first lens (10) on the image side (Lb) and a lens surface (21) of the second lens (20) on the object side (La), the sag amount Sag21 (mm) and the diameter D21 (mm) of the lens surface (21) satisfy the following conditional expression: 0<|Sag21/(D21/2)|<0.125.

An optical system (OL) formed from a preceding lens group (GA) having a negative refractive power, and a succeeding lens group (GB) having a positive refractive power, the lens groups being arranged in order from the object side along the optical axis. The succeeding lens group (GB) has: a focusing group (GF) having a positive refractive power, the focusing group (GF) being positioned furthest toward the object side of the succeeding lens group (GB); and an image-side group (GC) positioned further toward the image side than the focusing group (GF). During focusing from an infinitely distant object to a short-distance object, the focusing group (GF) moves toward the image side along the optical axis and satisfies the following conditional expression.

0.78<fB/fC<1.00

In this conditional expression,

fB is the focal distance of the succeeding lens group GB, and

fC is the focal distance of the image-side group GC.

The present disclosure discloses an optical imaging lens assembly including a first lens; a second lens with a convex object-side surface and a concave image-side surface; a third lens having a positive refractive power with a convex object-side surface; a fourth lens having a negative refractive power with a concave object-side surface; a fifth lens; a sixth lens with a convex object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface thereof having an inflection point; and a seventh lens having a refractive power with a convex object-side surface and a concave image-side surface, and at least one of the object-side surface and the image-side surface thereof having an inflection point, wherein a total effective focal length f and a radius of curvature R11 of the object-side surface of the sixth lens satisfy 1.00<f/R11<2.50.

An imaging optical system lens assembly includes six lens elements, which is, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element has negative refractive power, the object-side surface of the first lens element is concave in a paraxial region thereof, the image-side surface of the first lens element is convex in a paraxial region thereof. The second lens element has positive refractive power, the object-side surface of the second lens element is convex in a paraxial region thereof, the image-side surface of the second lens element is concave in a paraxial region thereof. The fifth lens element has positive refractive power.

A wide-angle lens (100) includes a front group (110), an aperture (80), and a rear group (120). The front group (110) includes a first lens (10), a second lens (20), and a third lens (30) arranged in order from a side (La) closest to an object to an image side (Lb). In such a wide-angle lens, to suppress an occurrence of a ghost caused by multiple reflection between a lens surface (22) of the second lens (20) on the image side (Lb) and a lens surface (31) of the third lens (30) on the object side (La), the sag amount Sag31 (mm) and the diameter D31 (mm) of the lens surface (31) satisfy the following conditional expression: 0<1Sag31/(D31/2)<0.125.

Zoom digital cameras comprising a Wide sub-camera and a folded fixed Tele sub-camera. The folded Tele sub-camera may be auto-focused by moving either its lens or a reflecting element inserted in an optical path between its lens and a respective image sensor. The folded Tele sub-camera is configured to have a low profile to enable its integration within a portable electronic device.

Zoom digital cameras comprising a Wide sub-camera and a folded fixed Tele sub-camera. The folded Tele sub-camera may be auto-focused by moving either its lens or a reflecting element inserted in an optical path between its lens and a respective image sensor. The folded Tele sub-camera is configured to have a low profile to enable its integration within a portable electronic device.

A wide-angle lens assembly, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, satisfies: 5.2≤(CT1+CT2)/CT4≤7.7; 1≤|R61/R52|≤5; wherein CT1 is an interval from an object side surface of the first lens to an image side surface of the first lens along an optical axis, CT2 is an interval from an object side surface of the second lens to an image side surface of the second lens along the optical axis, CT4 is an interval from an object side surface of the fourth lens to an image side surface of the fourth lens along the optical axis, R61 is a radius of curvature of an object side surface of the sixth lens, and R52 is a radius of curvature of an image side surface of the fifth lens.

An optical system includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a first reflective member, a second lens unit including an aperture diaphragm and having a positive refractive power, a second reflective member, and a third lens unit having a positive refractive power. Following inequalities are satisfied:

−1.27<(f1/f)/Npr<−0.70

0.60<f2/f3<1.60

where f represents a focal length of the optical system, f1 represents a focal length of the first lens unit, f2 represents a focal length of the second lens unit, f3 represents a focal length of the third lens unit, and NPr represents a refractive index of the first reflective member.