Light-measuring systems

Claim 2

In a light-responsive system, a plurality of photosensitive means for respectively providing electrical inputs when light is received by said plurality of photosensitive input means, with said inputs respectively having magnitudes determined by the brightness of the light received by said plurality of photosensitive input means, support means supporting said plurality of photosensitive input means respectively in positions for receiving light from different parts of a scene so that when the scene has a condition of non-uniform brightness the magnitudes of said inputs will vary with a pair of said photosensitive input means respectively providing inputs of maximum and minimum magnitude, electrical output means for providing a given output, and a plurality of electrical circuit means respectively connected electrically with said plurality of photosensitive input means for respectively producing given signals in a sequence determined by said magnitudes and all connected electrically with said output means for providing at the latter an output determined by the signal produced by the electrical circuit means connected to at least one of said pair of photosensitive input means.

Claim 3

The combination of claim 1 and wherein said plurality of electrical circuit means operate said electrical output means to provide an output corresponding to that part of said scene which has the maximum brightness.

Claim 4

The combination of claim 1 and wherein said plurality of electrical circuit means operates said electrical output means to provide an output corresponding to that part of the scene which has minimum brightness.

Claim 5

The combination of claim 1 and including a pair of said electrical output means electrically connected through said plurality of electrical circuit means with said plurality of photosensitive input means for respectively providing a pair of outputs one of which corresponds to that part of the scene which has maximum brightness and the other of which corresponds to that part of the scene which has minimum brightness.

Claim 6

The combination of claim 4 and wherein said plurality of photosensitive input means are arranged in pairs for respectively responding to maximum and minimum brightness and are electrically connected respectively with said plurality of electrical circuit means.

Claim 7

The combination of claim 4 and wherein said plurality of electrical circuit means form pairs of electrical circuit means with the two electrical circuit means of each pair being respectively connected with said pair of output means, and a single photosensitive input means electrically connected with each pair of electrical circuit means.

Claim 8

The combination of claim 1 and wherein said output means includes a switch movable between open and closed positions, and said plurality of electrical circuit means being electrically connected with said switch for moving the latter from one to the other of said positions for providing said output.

Claim 9

The combination of claim 7 and wherein said plurality of electrical circuit means respectively include a plurality of solenoids which respectively cooperate with said switch for displaying the latter from said one to said other position.

Claim 10

The combination of claim 8 and wherein said plurality of electrical circuit means include capacitors which become charged for actuating said solenoids.

Claim 11

The combination of claim 8 and wherein said plurality of electrical circuit means include capacitors which become discharged for actuating said solenoids.

Claim 12

The combination of claim 1 and wherein said plurality of electrical circuit means are fully electronic with said output means including an electronic switching means which transfers between an OFF state and an ON state for actuating said output means.

Claim 13

The combination of claim 11 and wherein said electronic circuit means include capacitors which become charged for actuating said electronic switch means.

Claim 14

The combination of claim 11 and wherein said electronic electrical circuit means include capacitors which become discharged for actuating said electronic switch means.

Claim 15

The combination of claim 1 and wherein said plurality of electrical circuit means each include a differential amplifier means for comparing an input with a given electrical quantity to determine operation of said output means.

Claim 16

The combination of claim 1 and wherein said plurality of electrical circuit means include a plurality of timing circuits and said output means including a timing circuit operated by the timing circuits of said plurality of electrical circuit means.

Claim 17

The combination of claim 1 and wherein said output means includes a meter for indicating a value corresponding to the magnitude of the input provided by said one of said pair of photosensitive input means.

Claim 18

The combination of claim 1 and wherein said plurality of photosensitive input means each include a cadmium sulfide resistor for providing a resistance value which is inversely proportional to the brightness of the light received by each resistor.

Claim 19

In a light-responsive system, a plurality of photosensitive input means for respectively providing electrical inputs when light is received by said plurality of photosensitive input means, with said inputs respectively having magnitudes determined by the brightness of the light received by said plurality of photosensitive input means, support means supporting said plurality of photosensitive input means respectively in positions for receiving light from different parts of a scene so that when the scene has a condition of non-uniform brightness the magnitudes of said inputs will vary with a pair of said photosensitive input means respectively providing inputs of maximum and minimum magnitude, electrical output means for providing a given output, and a plurality of electrical circuit means respectively connected electrically with said plurality of photosensitive means and all connected electrically with said output means for providing at the latter an output determined by at least of said pair of photosensitive input means, said plurality of electrical circuit means and said output means including a single timing circuit which is common to said plurality of electrical circuit means and said output means.

Claim 20

In a light-responsive system, a plurality of photosensitive input means for respectively providing electrical inputs when light is received by said plurality of photosensitive input means, with said inputs respectively having magnitudes determined by the brightness of the light received by said plurality of photosensitive input means, support means supporting said plurality of photosensitive input means respectively in positions for receiving light from different parts of a scene so that when the scene has a condition of non-uniform brightness the magnitudes of said inputs will vary with a pair of said photosensitive input means respectively providing inputs of maximum and minimum magnitude, electrical output means for providing a given output, and a plurality of electrical circuit means respectively connected electrically with said plurality of photosensitive means and all connected electrically with said output means for providing at the latter an output determined by at least of said pair of photosensitive input means, said plurality of electrical circuit means and said output means including a single timing circuit which is common to said plurality of electrical circuit means and said output means.