Patent ID: 7953474

Claim:
An optical sensor module for a body fat measurement apparatus, said apparatus being arranged to measure a thickness of a subcutaneous fat layer between skin and muscle in a biological tissue of an organism, the module comprising: at least one light source configured for use in a reflection scattering-absorption process; a tilter to control an irradiation angle of the at least one light source to radiate light from the at least one light source into the biological tissue at a predetermined angle other than an angle perpendicular to the biological tissue so that the radiated light penetrates deeper into the biological tissue, the tilter being placed between the at least one light source and the biological tissue whereby the light incident upon the biological tissue from the at least one light source falls substantially at an angle other than one perpendicular to the biological tissue; an optical detector to detect a scattered optical signal and to transform the scattered optical signal into an electric signal, the scattered optical signal being scattered from the light radiated into the biological tissue; and an optical power control unit to control a driving current applied to the at least one light source, wherein the optical detector further comprises a transformer unit to transform the scattered optical signal into an electrical signal, and wherein the irradiation angle is controlled such that the radiated light comprises a component directed away from the optical detector.