Automatic focus detection device for use in a camera

A camera provided with an ordinary photographic mode and a self timer photographic mode in which an actual photographing is executed after a predetermined delay time from a provision of a trigger signal and a photographing optical system having a movable lens system for projecting an image of an object to be photographed onto a predetermined plane, an in-focus condition of the movable lens system being adjustable by moving said movable lens system,

• said camera comprising;
• a light source accommodated in a body of the camera,
• a light projecting system for projecting light from said light source to the object,
• an automatic focus detection device for detecting in-focus condition of said photographing optical system by the light projected from said light projecting system,
• mode switching means for switching between the ordinary photographic mode and the self timer photographic mode, and
• a light source driving circuit being changeable in response to operation of the mode switching means between a mode for turning said light source on and off during the delay time of the self-timer photographic mode and a mode for turning on said light source for another predetermined time so as to project the light to the object for detecting the in-focus condition of the photographic optical system in the ordinary photographic mode.