Title:
CAMERA
Document Type and Number:
Japanese Patent JPH01155307
Kind Code:
A
Abstract:
PURPOSE:To divide the exit pupil of a photographic lens with a simple constitution by arranging a condenser lens in the go-and-return optical path of the light of an object by a light reflecting member. CONSTITUTION:The light reflecting member 5a is provided on a part of the image-formation surface of a focusing plate 4 and the light beams reflected on the member 5a are made to be guided to a photodetector 12 for detecting a focus. And the condenser lens 6 is arranged in the go-and-return optical path by the optical reflecting member 5a. Thus, the division of the exit pupil of the photographic lens 2 is performed with a condenser lens 6, so that the focus detection in a reasonable TTL phase difference detection system can be accomplished. Since the condenser lens 6 can be used in common in a finder system and a focus detection system, the number of parts is reduced and the title camera becomes satisfactory in space and in cost.
Inventors:
SUDA YASUO
HIGASHIHARA MASAKI
HIGASHIHARA MASAKI
Application Number:
JP31553687A
Publication Date:
June 19, 1989
Filing Date:
December 14, 1987
Export Citation:
Assignee:
CANON KK
International Classes:
G02B7/34; G03B3/00; G03B13/36; (IPC1-7): G02B7/11; G03B3/00
Attorney, Agent or Firm:
Minoru Nakamura