Photometry device

Patent 6487372 Issued on November 26, 2002. Estimated Expiration Date:

July 5, 2021. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Method and apparatus for exposure control based on color balance information
Patent #: 4887121
Issued on: 12/12/1989
Inventor: Pritchard

Auto-exposure device of a camera
Patent #: 5596387
Issued on: 01/21/1997
Inventor: Takagi

Camera having electronic flash units
Patent #: 5617175
Issued on: 04/01/1997
Inventor: Asakura, et al.

Camera system with color temperature meter
Patent #: 5710948
Issued on: 01/20/1998
Inventor: Takagi

Photometry device of camera
Patent #: 5987265
Issued on: 11/16/1999
Inventor: Iwasaki

Optical information recording medium capable of recording information on both track guide grooves and lands and optical information reproducing apparatus for optical information recording medium
Patent #: 6128270
Issued on: 10/03/2000
Inventor: Nishikawa

Camera provided with photometry device Patent #: 6175693
Issued on: 01/16/2001
Inventor: Iida

Inventors

Assignee

Asahi Kogaku Kogyo Kabushiki Kaisha

Application

No. 897927 filed on 07/05/2001

US Classes:

396/225, Color temperature compensation or detection396/234More than two photometering areas

Examiners

Primary: Perkey, W. B.

Attorney, Agent or Firm

Greenblum & Bernstein, P.L.C.

Foreign Patent References

5-340804 JP 12/23/1993
6-281994 JP 10/23/1994
7-84299 JP 03/23/1995
10253449 JP 09/23/1998

International Class

G03B 007/28

Foreign Application Priority Data

2000-07-06 JP

Abstract

A photometry device has a normal light photometry sensor and a external light sensor. The normal light photometry sensor performs photometry with respect to an object. The external light sensor performs photometry with respect color components of the external light. An exposure amount of an object is determined based on an output of a normal light sensor. If a difference between the exposure values is greater than the predetermined value, a color judged in the colorimetry procedure is forcibly set to "colorless" and no substantial colorimetric compensation is performed. If the Bv difference is not greater than the predetermined value, the light source compensation data preliminary stored is used for the colorimetric compensation.