Photographic apparatus for use in daylight and artificial light

Claim 2

In a photographic apparatus, a combination comprising objective means positioned to admit scene light to photographic film; filter means movable between plural positions to thereby influence the characteristics of scene light which is admitted by said objective means; displacing means for moving said filter means between said positions in dependency on spectral composition of scene light, said displacing means comprising electric switching means having a plurality of conditions, photosensitive receiver means in circuit with said switching means, said receiver means being exposed to scene light and being operative to change the condition of said switching means as a function of changes in spectral composition of scene light, said photosensitive receiver means including a first photosensitive resistor which reacts to daylight and a second photosensitive resistor which reacts to artificial light, said switching means comprising a first electromagnet energizable in response to exposure of said first resistor to daylight and a second electromagnet energizable in response to exposure of said second resistor to artificial light, and adjusting means for effecting movements of said filter means in response to changes in the condition of said switching means, said adjusting means including armature means which is movable to first and second positions on energization of said first and second electromagnets, respectively; and detent means for yieldably holding said armature means in either position.

Claim 3

In a photographic apparatus, a combination comprising a housing; color filter means movable in said housing between plural positions to thereby influence the characteristics of incoming scene light, said filter means including a daylight filter and an artificial light filter; displacing means for moving said filter means between said positions in dependency on the spectral composition of scene light, said displacing means comprising electric switching means having a plurality of conditions, photosensitive receiver means connected in circuit with said switching means, exposed to scene light and operative to change the condition of said switching means as a function of changes in spectral composition of scene light, said photosensitive receiver means comprising a pair of series-connected photosensitive resistors one of which reacts to daylight and the other of which reacts to artificial light, first and second fixed resistors connected in parallel with said photosensitive resistors and each having a resistance equaling the resistance of a different one of said photosensitive resistors when the respective photosensitive resistor is shielded from light, and adjusting means for effecting movements of said filter means in response to changes in the condition of said switching means, said adjusting means comprising first and second electromagnet means respectively energizable on exposure of said first and second photosensitive elements to daylight and artificial light, respectively; and holder means supporting said filter means and said electromagnets and movable between two positions to thereby select the initial position of said filter means in dependency on the type of film which is used in the apparatus, the initial position of said filter means in one position of said holder means being appropriate when the apparatus contains daylight film and the initial position of said filter means in the other position of said holder means being appropriate when the apparatus contains artificial light film.

Claim 4

In a photographic apparatus, a combination comprising a housing; color filter means movable in said housing between plural positions to thereby influence the characteristics of incoming scene light, said filter means including a daylight filter and an artificial light filter; displacing means for moving said filter means between said positions in dependency on the spectral composition of scene light, said displacing means comprising electric switching means having a plurality of conditions, photosensitive receiver means connected in circuit with said switching means, exposed to scene light and operative to change the condition of said switching means as a function of changes in spectral composition of scene light, said photosensitive receiver means comprising a pair of series-connected photosensitive resistors one of which reacts to daylight and the other of which reacts to artificial light, first and second fixed resistors connected in parallel with said photosensitive resistors and each having a resistance equaling the resistance of a different one of said photosensitive resistors when the respective photosensitive resistor is shielded from light, and adjusting means for effecting movements of said filter means in response to changes in the condition of said switching means, said adjusting means comprising first and second electromagnet means respectively energizable on exposure of said first and second photosensitive elements to daylight and artificial light, respectively; and holder means supporting said filter means and said electromagnets and movable between two positions to thereby select the initial position of said filter means in dependency on the type of film which is used in the apparatus, the initial position of said filter means in one position of said holder means being appropriate when the apparatus contains daylight film and the initial position of said filter means in the other position of said holder means being appropriate when the apparatus contains artificial light film.

Claim 5

A combination as defined in claim 2, further comprising means for moving said holder means between said positions thereof.

Claim 6

A combination as defined in claim 3, wherein said means for moving said holder means is actuatable in response to insertion of film-containing cartridges into said housing.