Ranging sensor, detection sensor, ranging method, and electronic device

A detection sensor, comprising:

• a light receiving unit configured to receive light from outside;
• and
• a calculation unit configured to process light reception data acquired by the light receiving unit,
• wherein the calculation unit compares detection light reception data with predetermined data, the detection light reception data being obtained as the light receiving unit receives light from a reference object provided at a predetermined distance, and controls notification processing to a user.

A ranging method, comprising:

• applying first light to a target;
• receiving the first light reflected from the target;
• calculating a distance from an irradiation point of the first light to the target based on light reception data acquired by receiving the first light;
• applying second light to a reference object provided at a predetermined distance;
• and
• comparing detection light reception data with predetermined data, the detection light reception data being acquired by receiving the second light reflected by the reference object, and controlling notification processing to a user.

An electronic device, comprising a ranging sensor that protrudes from a casing when used,

• the ranging sensor comprising:
• a light emitting unit configured to apply light to a target;
• a light receiving unit configured to receive light from the light emitting unit reflected from the target;
• and
• a calculation unit configured to calculate a distance from the light receiving unit to the target based on light reception data acquired by the light receiving unit, wherein
• the calculation unit compares detection light reception data with predetermined data, the detection light reception data being acquired as light is emitted from the light emitting unit to a reference object provided in the casing at a predetermined distance and the light of the light emitting unit reflected by the reference object is received by the light receiving unit, and controls notification processing to a user.