Forehead thermometer for hygienic measurement

A forehead thermometer comprising:

• a main body having a probe formed on a front portion of said main body;
• a thermal-mass sleeve formed in said probe, having a Fresnel lens secured in a front end portion of said sleeve, and an infrared sensor formed in a bottom portion of said sleeve;
• and a longitudinal axis defined at a longitudinal center of said lens and said sensor to be generally perpendicular to a temperature sensing area on a patient's body portion;
• a lamp formed in said main body and juxtapositioned to said longitudinal axis of said probe and said sleeve for projecting a light parallel to said axis to optically aim at a reference target area on the patient's body portion;
• said reference target area separating from said axis of said center of said temperature sensing area with a predetermined distance;
• whereby upon actuation of said electronic circuit to turn on said lamp to optically aim at said reference target area, said temperature sensing area will be automatically obtained;
• and an infrared temperature signal as radiated from the sensing area will be transmitted through said lens to be focused on said sensor and to be processed by said electronic circuit for obtaining a temperature data without contacting the patient's body portion.