TTL automatic light controlling camera system

Details TTL automatic light controlling camera system TTL automatic light controlling camera system

1992-09-30

1993-07-13

Gellner, Michael L.

354416, 3541271, G03B 1505

Patent

active

052278360

ABSTRACT:
TTL automatic light controlling camera systems include a camera body and a flashing device. Depending upon the operating mode capabilities of the camera body and the flashing device, different flashing and light control operating modes may be set at the camera body or the flashing device, or both. Camera bodies have the ability to detect the operating capabilities of flashing devices used therewith, and vice versa. Some operating modes are effected automatically or are prohibited depending upon the capabilities of the camera body and the flashing device and depending upon the setting of operating modes at the camera body or the flashing device, or both. Among the possible operating modes are a TTL multicontrol mode, in which the flashing device emits preliminary (previous) light followed by a main light emission, and a TTL normal light control mode, in which the flashing device emits only main light. In the TTL multicontrol mode, quantities of reflected preliminary light from divided regions of a subject field are detected to determine weighting of the divided regions that is used in main light emission control by the camera. The operating mode may be dictated by whether charging of the flashing device is complete.

REFERENCES:
patent: 32437 (1887-06-01), Taniguchi et al.
patent: 4311372 (1982-01-01), Gahler
patent: 4657367 (1987-04-01), Kataoka
patent: 5006879 (1991-04-01), Takagi et al.
patent: 5164759 (1992-11-01), Yasukawa

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