RING LIGHT STROBOSCOPE PROVIDED WITH ROTARY LIGHT SHIELDING PLATE FOR LIGHT BALANCE AND LIGHT QUANTITY CONTROL

摘要

PROBLEM TO BE SOLVED: To freely control light balance and light quantity by adjusting the rotational angle of a rotatable light shielding plate having special shape installed in front of a light emitting surface. ;SOLUTION: The rotary light shielding plate for light balance and light quantity control 10 installed freely rotatably around an optical axis as a center in front of the ring-like light emitting surface is constituted of a thin outside circular frame part 11 and a light emitting tube shielding plate part 12 disposed inside the frame part 11 by leaving a space. For example, when the rotating position of the light shielding plate 10 is selected, two light emitting tubes 23 are completely shielded to be in a state where light emission is largely disturbed and strobe light emission with the light balance that light beams from other two light emitting tubes 23, upper and left, are emphasized is performed, so that intense shadow is case on the lower and the right sides of a subject, and the subject is three-dimensionally expressed. When another rotating position of the light shielding plate is selected, the light emitting tubes 23 are not shielded to be in a fully opened state, and the light emission where the light balance is uniform and the light quantity is also large is performed, so that the subject and its periphery are evenly irradiated with the light beams and the entire state is intelligibly expressed.;COPYRIGHT: (C)1998,JPO