US 5,311,244 A · Exposure control device for a camera

Abstract

An exposure control device for a camera comprising; first means for measuring light from a central area of an object field, said first measuring means including a plurality of means for receiving light from different portions within the central area, respectively; second means for measuring light from a surrounding area other than the central area, the surrounding area being greater than each portion within the central area; means for selecting between a first exposure control mode and a second exposure control mode; and means for controlling exposure in accordance with one of said plurality of receiving means in said first exposure control mode, and in accordance with all of said plurality of receiving means and said second measuring means in said second exposure control mode.

Claims8

Dependent claims

An exposure control device for a camera operable in a flash photography mode, comprising:

first means for measuring ambient light from a central area of an object field;
second means for measuring ambient light from another area of the object field which is outside of the central area;
means responsive to said first and second measuring means for detecting a back light condition;
means for controlling an exposure amount on the basis of the measured ambient light of said other area, as measured by said second measuring means, when said detecting means detects the back light condition;
and
means for controlling a flash light emission independently of said second measuring means.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

08/120,227Filed 14 Sep 1993 · continuation

Priority

JP 60-2002779 Sep 1985

Granted

10 May 1994

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

G03B 7/28
Control of exposure by setting shutters, diaphragms or filters, separately or conjointly: circuitry to measure or to take account of the object…
G03B 7/08
Control of exposure by setting shutters, diaphragms or filters, separately or conjointly: control effected solely on the basis of the response, to…
G03B 7/093
Digital circuits: for control of exposure time
G03B 7/16
Control of exposure by setting shutters, diaphragms or filters, separately or conjointly: in accordance with both the intensity of the flash…

Family

Serial905,267Parent of this continuation · filed 9 Sep 1986

Serial298,128Parent of this continuation · filed 17 Jan 1989

Serial524,909Parent of this continuation · filed 18 May 1990

Serial684,259Parent of this continuation · filed 12 Apr 1991

US 5,017,957 AParent of this continuation

US 4,937,610 AParent of this continuation

US 4,821,074 AParent of this continuation

US 5,311,244 AThis patent

From the US filing history. Foreign family members aren’t listed.

Exposure control device for a camera

Life of this patent

Exposure control device for a camera

Life of this patent

Abstract

Claims8