Photography – With exposure objective focusing means – focusing aid – or... – Optical detail with photoelement system
Patent
1998-04-09
1999-08-17
Perkey, W. B.
Photography
With exposure objective focusing means, focusing aid, or...
Optical detail with photoelement system
396272, 396275, G03B 1336
Patent
active
059406356
ABSTRACT:
Disclosed is a focus detection optical system of a single lens reflex camera wherein a quick return mirror directs a part of luminous flux incident through a photographic lens system towards an optical sensor unit to detect the focusing state of the photographic lens system. The quick return mirror comprises a main mirror part which transmits said part of luminous flux while reflects the other part of luminous flux, and a sub-mirror part attached to the main mirror part so as to direct the part of luminous flux having transmitted the main mirror part toward the optical sensor unit. The main mirror part is provided with an infra-red cut coat which is formed on at least partial area of the light output side surface of the main mirror part which faces the sub-mirror part.
REFERENCES:
patent: 4552445 (1985-11-01), Mukai et al.
patent: 5752099 (1998-05-01), Takebayashi et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Perkey W. B.
LandOfFree
Focus detection optical system in a single lens reflex camera does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Focus detection optical system in a single lens reflex camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus detection optical system in a single lens reflex camera will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-324569