Light measuring device

A light measuring device comprising:

• (a) light receiving means including a plurality of light receiving parts arranged to divide a photographing field into a plurality of area inclusive of at least three areas including a middle area located in the middle of said field, a first outer area located on the outer side of said middle area and a second outer area located on the outer side of said first outer area, to subdivide at least said second outer area into a plurality of smaller areas, and to obtain luminance information on each of said middle area, said first outer area, said second outer area and said smaller area, said light receiving means obtaining luminance information values on peripheral areas from a peripheral luminance computing circuit implementing a computing formula which includes, as a function, the luminance information value obtained on at least one of said smaller peripheral areas;
• (b) luminance difference detecting means for obtaining luminance information difference values between adjacent areas among said plurality of areas from a plurality of said luminance information values obtained by said light receiving means;
• (c) computing means including photometric value computing circuits for implementing a plurality of computing formulas each of which includes as a function at least one of said plurality of said luminance information values obtained by said light receiving means;
• and
• (d) selection means for selecting one of said photometric value computing circuits as operative in providing light measurement output by said device on the basis of at least one of said plurality of said luminance information values obtained by said light receiving means and said luminance information difference values obtained by said luminance difference detecting means.

A light measuring device comprising:

• (a) light receiving means arranged to divide a photographing field into a plurality of areas and to obtain luminance information values on each of said plurality of areas;
• (b) luminance difference detecting means for obtaining luminance information difference values among said areas from a plurality of said luminance information values obtained by said light receiving means;
• (c) computing means including photometric value computing circuits for implementing computing formulas each of which includes as a function at least one of said plurality of luminance information values obtained by said light receiving means, said computing formulas including
• (1) a formula for highlighting a specific area of said photographic field,
• (2) a formula for shadow depicting a specific area of said photographing field;
• and
• (d) selection means for selecting one of said photometric value computing circuits of said computing means as operative in providing light measurement output by said device on the basis of at least one of said plurality of luminance information values obtained by said light receiving means and said luminance information difference values obtained by said luminance difference detecting means.

A light measuring device comprising:

• (a) light receiving means arranged to divide a photographing field into a plurality of areas and to obtain luminance information values on each of said areas;
• (b) luminance difference detecting means for obtaining luminance information difference values among said plurality of areas from a plurality of said luminance information values obtained by said light receiving means;
• (c) computing means including photometric value computing circuits for implementing a plurality of computing formulas each of which includes as a function at least one of said plurality of said luminance information values obtained by said light receiving means;
• and
• (d) selection means for selecting one of said photometric value computing circuits of said computing means, said selection means being operative:
• (1) to select from said computing means a first photometric computing circuit which gives an exposure for highlighting a specific area of said photographing field when a predetermined one of said plurality of luminance information values is detected to be larger than a first luminance value which is preset at a high luminance value,
• (2) to select from said computing means a second photometric computing circuit which gives an exposure for shadow depicting a specific area of said field when said predetermined one of said plurality of luminance information values is detected to be smaller than a second luminance value preset at a low luminance value, and
• (3) to select from said computing means one of said photometric value computing circuits on the basis of at least one of said plurality of luminance information values and at least two luminance information difference values obtained by said lumiannce difference detecting means when said specific luminance information value is detected to be smaller than said first luminance value and larger than said second luminance value.

A light measuring device comprising:

• (a) light receiving means arranged to divide a photographic field into a plurality of areas inclusive of at least three areas including a middle area located in the middle of said field, a first outer area located on the outer side of said middle area and a second outer area located on the outer side of said first outer area and to obtain luminance information values on each of said plurality of areas;
• (b) luminance difference detecting means for obtaining a plurality of luminance information difference values between adjacent areas among said plurality of areas from a plurality of said luminance information values obtained by said light receiving means;
• and
• (c) a circuit for determining a photometric value on the basis of at least the luminance information in said first outer area, said circuit being operative to substantially correct the luminance information value of said middle area and the luminance information value of said first outer area in accordance with said plurality of luminance information difference values.