초록 ▼

An auxiliary light source for a camera having an automatic focusing device as an adapter attachable to a shoe part of the camera and which inhibits light measuring action during an auxiliary light emitting action for always obtaining accurate light measurement. The arrangement solves the following p

An auxiliary light source for a camera having an automatic focusing device as an adapter attachable to a shoe part of the camera and which inhibits light measuring action during an auxiliary light emitting action for always obtaining accurate light measurement. The arrangement solves the following problems. In a camera of this type, the output of an automatic focusing sensor becomes too low for automatic focusing when automatic focusing is to be carried out under low light conditions. Systems contrived by the prior art to solve this problem have an auxiliary light source disposed within the camera for illuminating an object to be photographed during automatic focusing. However, since the auxiliary light source device is included within the camera, the auxiliary light is not effectively utilizable when a large lens such as a telephoto lens is used, since the auxiliary light is eclipsed by the lens barrel. Furthermore, when a light measuring circuit is operated during illumination by an auxiliary light, the light measurement output obtained for control would be affected by the illumination light making accurate light measurement almost unobtainable.

대표청구항 ▼

A lighting device to be used in combination with a camera having an automatic focusing device for adjusting the focus on an object to be photographed, said automatic focusing device working prior to an exposure control operation of the camera, and said lighting device comprising: (a) a mount part wh

A lighting device to be used in combination with a camera having an automatic focusing device for adjusting the focus on an object to be photographed, said automatic focusing device working prior to an exposure control operation of the camera, and said lighting device comprising: (a) a mount part which is attachable to a shoe part of said camera, wherein said shoe part of the camera is provided at a position above a pentagonal part of the camera and said mount part has a signal terminal which can be connected to a signal pin provided at the shoe part of the camera, further said signal pin is connected to a starting signal forming circuit which produces a starting signal prior to the exposure control operation of the camera; and (b) an emitting source for projecting light to an object in response to said starting signal received through said signal pin and said signal terminal; and wherein said automatic focusing device is of the accumulation type in which the operation of accumulating image signals is recycled, and said starting signal forming circuit produces said starting signal in such a way as to be in synchronism with the accumulating operation so that light is emitted from said emitting source at least during the image signal accumulating operation of said focusing device.