1988-01-12
1989-05-09
Mathews, A. A.
354246, G03B 940
Patent
active
048293296
ABSTRACT:
A brake device of a shutter for braking the shutter nearly at the end of the travel of trailing shutter blades includes a moving member which is provided for the trailing blades and moves accordingly as the trailing blades travel; a brake lever for the trailing blades which comes to abut on the moving member nearly at the end of the movement thereof corresponding to the near end of the travel of the trailing blades, the brake lever being arranged to be pushed to move to some extent by the moving member and to brake the travel of the trailing blades with a load resulting from the movement, the brake lever having at least one tapered portion which is in a wedge-like shape; and load means for loading the tapered portion of the brake lever by coming into sliding contact with the tapered portion being moving, the load means including at least two faces opposed to each other at a distance which decreases in the direction of the movement of the tapered portion, at least one of the two faces being formed with a spring member which is arranged to resiliently deform, so that the load resulting from the movement of the brake lever gradually increases.
REFERENCES:
patent: 4109266 (1978-08-01), Inoue
patent: 4201459 (1980-05-01), Nakano
patent: 4302091 (1981-11-01), Harase et al.
patent: 4692009 (1987-09-01), Toyoda et al.
Fukuda Tsuyoshi
Toyoda Yasuhiro
Canon Kabushiki Kaisha
Mathews A. A.
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