US Patent 7607799 Illumination device and illumination unit

Light from a LED (point-like light source) is expanded smoothly to a desirable range at a high efficiency by a light flux control member. The light flux control member is provided with a lens portion located at a part corresponding to the LED and a mount portion (body portion) detachably supporting the lens portion. The lens portion has a back face provided with a recess located as to correspond to the LED. The recess expands light from the LED smoothly and efficiently to a broad range, bringing an emission from a front face (fore face) toward a wide range. A member-to-be-illuminated supplied with the emission is illuminated uniformly. LEDs and recesses are made enable to be arranged flexibly without need of an increased number of molds.