Focus detecting apparatus

A focus detecting apparatus comprising:

• an image capturing lens that allows light from a subject to be transmitted through the image capturing lens;
• a light-transmitting unit that defines a range of beams of transmitted light;
• a light-receiving unit that defines a range of beams of received light;
• and
• an optical film for transmitting a beam of light that has passed through the image capturing lens,
• wherein:
• a beam of light from the light-transmitting unit is reflected on a reflection mirror comprising the optical film, passes through a first exit pupil area on one side of an optical axis of the image capturing lens, and is transmitted to the subject,
• a beam of reflected light of light irradiated onto the subject passes through a second exit pupil area on another side of the optical axis of the image capturing lens, is reflected on the reflection mirror comprising the optical film, and is received by the light-receiving unit,
• a focal position is obtained using information regarding a position of the beam of light received by the light-receiving unit, and
• each of the first and second exit pupil areas is defined in a range of a particular F-value of the image capturing lens.

A focus detecting apparatus comprising:

• an image capturing lens that allows light from a subject to be transmitted through the image capturing lens;
• a light-transmitting unit that defines a range of beams of transmitted light;
• a light-receiving unit that defines a range of beams of received light;
• and
• an optical film that transmits a beam of light that has passed through the image capturing lens,
• wherein:
• a beam of light from the light-transmitting unit is reflected on a reflection mirror comprising the optical film, passes through a first exit pupil area on a first side of an optical axis of the image capturing lens, and is transmitted to the subject,
• a beam of reflected light of light irradiated onto the subject passes through a second exit pupil area on a second side of the optical axis of the image capturing lens, is reflected on the reflection mirror comprising the optical film, and is received by the light-receiving unit,
• a beam of reflected light of light irradiated onto the subject passes through a third exit pupil area on a third side of the optical axis of the image capturing lens, is reflected on the reflection mirror comprising the optical film, and is received by the light-receiving unit,
• a focal position is obtained using information regarding a position of the beam of light from the second exit pupil area or the third exit pupil received by the light-receiving unit, and
• each of the first through third exit pupil areas is defined in a range of a particular F-value of the image capturing lens.

A focus detecting apparatus comprising:

• an image capturing lens that allows light from a subject to be transmitted through the image capturing lens;
• a light-transmitting unit comprising a plurality of light-transmitting elements that define a range of beams of transmitted light;
• a light-receiving unit that define a range of beams of received light;
• and
• an optical film that transmits beams of light that have passed through the image capturing lens,
• wherein:
• beams of light from the light-transmitting unit are reflected on a reflection mirror comprising the optical film, pass through a first exit pupil area on one side of an optical axis of the image capturing lens, and are transmitted to the subject,
• beams of reflected light of light irradiated onto the subject pass through a second exit pupil area on another side of the optical axis of the image capturing lens, are reflected on the reflection mirror comprising the optical film, and are received by the light-receiving unit,
• a focal position is obtained using information regarding a position of the beams by the light-receiving unit, and
• lights transmitted from the plurality of light-transmitting elements are disposed to be transmitted through a plurality of subject areas.