PURPOSE: To optimize the range of the detection depth in the skin by setting the min. detection depth between the intersected point of a straight line connecting the 1st end of a light emitting chip and the 1st end of a light shielding wall and a straight line connecting the 2nd end of the light shielding wall and the 2nd end of a light receiving chip and the top face of the shielding wall larger than the skin thickness of the patient's skin.
CONSTITUTION: A 1st ray 30 emitted from the upper left end of the light emitting chip 12 passes the upper left end of the light shielding wall 16 and is then partially reflected in the position of 0.35mm depth within the skin 18. The 1st reflected ray 32 passes the upper right end of the upper part of the light shielding wall 16 and is then received at the upper right end of the light receiving chip 10. This 0.35mm distance regulates the min. detection depth D which is the bottom end of the detection depth range 6. The 2nd ray 34 emitted from the upper right end of the light emitting chip 12 passes the upper left end of the light shielding wall 16 and is then partially reflected in the position of 0.70mm depth within the skin 18. The 2nd reflected ray 36 passes the upper right end of the light shielding wall 16 and is then received at the upper left end of the light receiving chip 10. This 0.79mm distance regulates the upper end M.
JIYONASAN PII IEEBU
RONARUDO ERU BURANZUTETSUTAA
