Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1987-01-20
1989-02-28
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354408, G01J 120
Patent
active
048088080
ABSTRACT:
A focus detecting optical system including a condenser lens disposed in a vicinity of or rearwardly of a predetermined focal plane of a photographic lens, an image forming lens unit having a pair of image forming lens sections disposed symmetrically relative to a main optical axis, a light blocking member having an opening for regulating a luminous flux coming into the image forming lens unit, a first prism for refracting the luminous flux in a direction departing from the main optical axis, a second prism for refracting the luminous flux in a direction nearing the main optical axis and a light receiving element array. An image formed on the light receiving element array and formed of the luminous flux carried through the condenser lens, the first prism, one of the image forming lens sections and the second prism and an image formed on the light receiving element array and formed of the luminous flux carried through the condenser lens, the first prism, the other image forming lens section and the second prism are placed with a sufficient distance therebetween by working of the first and second prisms. A focus detecting operation is carried out by comparing these images.
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Hamada Masataka
Ishida Tokuji
Karasaki Toshihiko
Norita Toshio
Taniguchi Nobuyuki
Minolta Camera Kabushiki Kaisha
Nelms David C.
Ruoff Jessica
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