Patent US3767853A successfully refreshed from Google Patents.
US3767853A
Expired / Lapsed
US
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Automatic iris control
Assignee: Individual
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Filing: 1972-09-21
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Granted: 1973-10-23
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Expires: 1992-09-21
Abstract
Abstract An automatic iris control for use in a television camera. The apparatus is responsive to changes in scene illumination and prevents iris change in response to capping the lens. A memory system is employed to retain the iris control voltage prior to lens cap operation and maintain that voltage until the lens cap is removed. Delay circuitry insures inactivation of automatic iris control until the lens cap is completely withdrawn.
Inventors
- 👤 S Bendell
- 👤 C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:31
CPC Classifications
H; H04; H04N; H04N23/00; H04N23/50; H04N23/55; H04N23/70; H04N23/71; H04N23/75
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
260 words
In a television camera, a system for automatically adjusting an iris disposed in the optical path of said camera, comprising: means for detecting light from an illuminated scene and converting said light into electrical signals; lens capping means; means selectively operative in a first condition for disposing said lens capping means in the optical path of said detecting means for inhibiting scene light in said optical path, and operative in a second condition for disposing said lens capping means out of said optical path of said detecting means allowing scene illumination to pass thereto; an adjustable iris means disposed in the light path of said detecting means; peak detecting means coupled to said light detecting means; memory means coupled to said peak detecting means, said memory means providing a control signal corresponding to the integral of the output signal of said peak detecting means; means for decoupling said memory means from said peak detecting means when said lens capping means inhibits scene light from said detecting means; delaying means for retarding coupling of said memory means to said peak detecting means for a predetermined interval after said lens capping means is operated to allow light to arrive at said detecting means; variable resistance means coupled to said memory means, said memory means controlling the resistance of said variable resistance means; and servo means coupled to said iris and to said variable resistance means for controlling the aperture of said iris in response to changes in said variable resistance whereby said iris aperture is adjusted corresponding to changes in scene illumination.
Claim 2
Dependent Claim
260 words
In a television camera, a system for automatically adjusting an iris disposed in the optical path of said camera, comprising: means for detecting light from an illuminated scene and converting said light into electrical signals; lens capping means; means selectively operative in a first condition for disposing said lens capping means in the optical path of said detecting means for inhibiting scene light in said optical path, and operative in a second condition for disposing said lens capping means out of said optical path of said detecting means allowing scene illumination to pass thereto; an adjustable iris means disposed in the light path of said detecting means; peak detecting means coupled to said light detecting means; memory means coupled to said peak detecting means, said memory means providing a control signal corresponding to the integral of the output signal of said peak detecting means; means for decoupling said memory means from said peak detecting means when said lens capping means inhibits scene light from said detecting means; delaying means for retarding coupling of said memory means to said peak detecting means for a predetermined interval after said lens capping means is operated to allow light to arrive at said detecting means; variable resistance means coupled to said memory means, said memory means controlling the resistance of said variable resistance means; and servo means coupled to said iris and to said variable resistance means for controlling the aperture of said iris in response to changes in said variable resistance whereby said iris aperture is adjusted corresponding to changes in scene illumination.
Claim 3
Dependent Claim
72 words
In a television camera, a system for automatically adjusting an iris according to claim 1, wherein: said memory means comprises a capacitor and a field effect transistor having a gate electrode coupled to said capacitor, a drain electrode coupled to a source of supply voltage and a source electrode coupled to said variable resistance means; and said decoupling means includes relay contacts coupled to said peak detecting means and to said capacitor.
Claim 4
Dependent Claim
97 words
In a television camera, a system for automatically adjusting an iris according to claim 1, wherein: said decoupling means includes relay circuitry for decoupling said memory means from said peak detecting means; said delaying means includes a resistor-capacitor network having a predetermined time constant, and a transistor having an input electrode coupled to said resistor-capacitor network, and an output electrode coupled to said relay circuitry to energize said relay circuitry to couple said memory means to said peak-detecting means after a predetermined delay after said lens capping means is caused to assume said second condition of operation.
Claim 5
Dependent Claim
144 words
An automatically adjustable light transmission system comprising: light detecting means for producing an electrical signal representative of light from an illuminated scene; light inhibiting means selectively operable from a first to a second condition to respectively permit and inhibit light from an illuminated scene from reaching said light detecting means; an adjustable light transmission means disposed in the optical path to said light detecting means for adjusting the intensity of said scene illumination at said detecting means; means including a signal storage device coupled between said light detecting means and said adjustable light transmission means to adjust said light transmission means in response to said electrical signal representative of light from an illuminated scene; and means for decoupling said light detecting means from said signal storage device when said selectively operable means inhibits light from said illuminated scene from reaching said light detecting means.
Claim 6
Dependent Claim
144 words
An automatically adjustable light transmission system comprising: light detecting means for producing an electrical signal representative of light from an illuminated scene; light inhibiting means selectively operable from a first to a second condition to respectively permit and inhibit light from an illuminated scene from reaching said light detecting means; an adjustable light transmission means disposed in the optical path to said light detecting means for adjusting the intensity of said scene illumination at said detecting means; means including a signal storage device coupled between said light detecting means and said adjustable light transmission means to adjust said light transmission means in response to said electrical signal representative of light from an illuminated scene; and means for decoupling said light detecting means from said signal storage device when said selectively operable means inhibits light from said illuminated scene from reaching said light detecting means.
Claim 7
Dependent Claim
56 words
An automatically adjustable light traNsmission means according to claim 4, wherein: said means for decoupling said light detecting means further includes delay means for delaying coupling of said light detecting means to said signal storage device for a predetermined interval after said light inhibiting means is selectively operated to permit light to reach said detecting means.
Claim 8
Dependent Claim
29 words
An automatically adjustable light transmission means according to claim 5, wherein: said delay means comprises a source of voltage coupled to a resistance-capacitance circuit for controlling said predetermined interval.
Claim 9
Dependent Claim
114 words
An automatically adjustable light transmission means according to claim 6, wherein: said delay means additionally includes a relay having an energizing coil and contacts; a transistor having an input electrode coupled to said resistor-capacitor charging network and an output electrode coupled to said energizing coil of said relay, said resistor-capacitor charging network being connected to begin charging when said light inhibiting means is operated to permit light from a scene to reach said light detecting means, said transistor being rendered conductive after said resistor-capacitor charging network charges to a predetermined level to thereby cause said relay to activate said contacts wherein said contacts operate to couple said memory means to said light detecting means.
Claim 10
Dependent Claim
52 words
An automatically adjustable light transmission means according to claim 4, wherein: said means for decoupling includes relay contacts coupled to said signal storage device, said contacts being operated to decouple said light detecting means from said signal storage device in response to said light inhibiting means being selectively operated for inhibiting light.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |