Patent ID: 6782197
Filing Date: 2004-08-24
Classification: G03B

Abstract:
A zoom strobe device comprising:a reflector; a rod-shaped tubular light emitting tube; and a Fresnel lens; wherein a distance between the reflector, which is provided on the base thereof with the rod-shaped tubular light emitting tube, and the Fresnel lens is varied to vary a flash angle of illumination, wherein said zoom strobe device satisfies the following conditions (1) and (2): 0.08Lw<0.15â€ƒâ€ƒ(1); and0.70<Lw/H<0.85â€ƒâ€ƒ(2); wherein &phgr; designates the resultant power of the Fresnel lens in an upward/downward direction perpendicular to the length of the rod-shaped light emitting tube; Lw designates the distance between the base of the reflector and an outer surface of the Fresnel lens when the reflector is located closest to the Fresnel lens; and H designates the maximum length of the strobe device in the upward/downward direction.