Patent ID: 6430371
Filing Date: 2002-08-06
Classification: G03B

Abstract:
A ring light guide device for a camera, comprising:a housing having an adaptor inserting hole which is formed therethrough at a side thereof in a manner such that the adaptor inserting hole has an axis which is coaxial with a center axis of a lens of the camera, the housing being detachably coupled on a rear surface thereof with a camera fitting adaptor by the fact that the camera fitting adaptor is inserted into the adaptor inserting hole; light receiving means installed opposite to a light source of the camera, for receiving light which is emitted from the light source; light path changing means for changing a path of light received by the light receiving means in a manner such that the light is irradiated toward an object in a direction which is substantially parallel to the center axis of the lens of the camera; and irradiation adjusting assembly constructed to to adjust an amount of light which is irradiated to the object, depending upon a camera-to-object distance, the irradiation adjusting assembly comprising: a first polarized filter rotatably installed inside the housing in a manner such that the first polarized filter is opposite to the light source of the camera, for allowing only one linear polarized light component of received light to pass therethrough; a second polarized filter installed downstream of the first polarized filter, the second polarized filter cooperating with the first polarized filter for determining an amount of the one linear polarized light component which can pass through them; and an adjusting piece fixed around the first polarized filter in a manner such that the adjusting piece partially projects out of the housing.