Patent ID: 7533999
Filing Date: 2009-05-19
Classification: G03B,H04N

Abstract:
1. An auxiliary lighting device that is incorporated in a camera and is disposed at a position being apart from an optical axis of a photographic lens for capturing a subject, comprising: a light emitting member, shaped in substantially a cylinder to emit light for irradiating a subject; a circumferential wall reflector disposed behind the light emitting member so as to reflect the light, emitted from the light emitting member, toward the subject; a first sidewall reflector, a surface of which intersects a longitudinal axis of the light emitting member, and which is disposed at a first position near to the optical axis of the photographic lens; and a second sidewall reflector, a surface of which intersects the longitudinal axis of the light emitting member, and which is disposed at a second position far from the optical axis of the photographic lens, compared to the first position; wherein a first angle, formed between the first sidewall reflector and an imaginary surface being orthogonal to the longitudinal axis of the light emitting member, is different from a second angle, formed between the second sidewall reflector and another imaginary surface being orthogonal to the longitudinal axis of the light emitting member; and wherein the second angle is set at angle α, which fulfills the equation of, a is a distance between the longitudinal axis of the light emitting member and a leading edge of the second sidewall reflector in a direction of the optical axis of the photographic lens, b is a distance between a center of the light emitting section and the leading edge of the second sidewall reflector in a direction orthogonal to the optical axis of the photographic lens, c is a distance between the longitudinal axis of the light emitting member and an intersect of long side light bundles in the direction of the optical axis of the photographic lens, r is a distance between the optical axis of the photographic lens and the center of the light emitting section in the direction orthogonal to the optical axis of the photographic lens, D is a distance between a photographic position in a most close-up distance photographing mode and the intersect of the long side light bundles in the direction of the optical axis of the photographic lens, and θ is a half angle of view in a long side direction.