Patent US3825329A successfully refreshed from Google Patents.
US3825329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion picture camera having means for simultaneously selecting the film speed and the corresponding aperture size
Assignee: Robert Bosch Photokino GmbH
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Filing: 1973-03-19
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Granted: 1974-07-23
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Expires: 1993-03-19
Abstract
Abstract A motion picture camera is adapted to operate at a first and second film speed and requires a first and second aperture size at the first and second film speed, respectively. A speed regulator regulates the speed of the camera to the first and second speed, respectively, when connected to the battery through a first and second resistor, respectively. Aperture control means open the aperture to the aperture size corresponding to the first film speed when connected to the battery through a third resistor and open the aperture to the second aperture size corresponding to the second film speed when connected to the source of electrical energy through a fourth resistor. First, second, third and fourth transistors connect the corresponding respective resistors to the battery when in a conductive state. A speed selector switch is externally operable to select the first or second speed. Connected to the speed selector switch is a control transistor which is interconnected with the bases of the first, second, third and fourth transistors in such a way that the first and third resistor is connected to the battery when the speed selector switch is in the first position and that the second and fourth transistors are conductive when the speed selector switch is in the second position.
Inventors
- 👤 F Heinrich
- 👤 H Kiefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:43
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/085; G03B19/00; G03B19/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
328 words
In a motion picture camera adapted for operation at a first and second film speed and requiring a first and second lens opening for equal exposure at said first and second speed respectively, an arrangement for simultaneously selecting said first or said second film speed and the corresponding lens opening comprising, in combination, a source of electrical energy; first, second, third and fourth impedance means; speed regulator means for regulating said film speed to said first speed when connected to said source of electrical energy through said first impedance means and to said second speed when connected to said source of electrical energy through said second impedance means; aperture control means for furnishing said first lens opening when connected to said source of electrical energy through said third impedance means and for furnishing said second lens opening when connected to said source of electrical energy through said fourth impedance means; first and second electronic switch means, each having a conductive state in response to a control signal, and a non-conductive state, for connecting said speed regulator means to said source of electrical energy through said first and second impedance means, respectively, when in said conductive state; third and fourth electronic switch means each having a conductive state responsive to a control signal, for connecting said aperture control means to said source of electrical energy through said third and fourth impedance means, respectively, when in said conductive state; speed selector switch means adapted for external activation to a first or second selector position; and electronic control switch means connected to said speed selector switch means for furnishing said control signal to said first and third electronic switch means when said speed selector switch means is in said first selector position and to said second and fourth electronic switch means when said speed selector switch means is in said second selector position, whereby the corresponding lens opening is selected substantially simultaneously with the selection of one of said film speeds.
Claim 2
Dependent Claim
328 words
In a motion picture camera adapted for operation at a first and second film speed and requiring a first and second lens opening for equal exposure at said first and second speed respectively, an arrangement for simultaneously selecting said first or said second film speed and the corresponding lens opening comprising, in combination, a source of electrical energy; first, second, third and fourth impedance means; speed regulator means for regulating said film speed to said first speed when connected to said source of electrical energy through said first impedance means and to said second speed when connected to said source of electrical energy through said second impedance means; aperture control means for furnishing said first lens opening when connected to said source of electrical energy through said third impedance means and for furnishing said second lens opening when connected to said source of electrical energy through said fourth impedance means; first and second electronic switch means, each having a conductive state in response to a control signal, and a non-conductive state, for connecting said speed regulator means to said source of electrical energy through said first and second impedance means, respectively, when in said conductive state; third and fourth electronic switch means each having a conductive state responsive to a control signal, for connecting said aperture control means to said source of electrical energy through said third and fourth impedance means, respectively, when in said conductive state; speed selector switch means adapted for external activation to a first or second selector position; and electronic control switch means connected to said speed selector switch means for furnishing said control signal to said first and third electronic switch means when said speed selector switch means is in said first selector position and to said second and fourth electronic switch means when said speed selector switch means is in said second selector position, whereby the corresponding lens opening is selected substantially simultaneously with the selection of one of said film speeds.
Claim 3
Dependent Claim
41 words
An arrangement as set forth in claim 5, wherein said first, second, third and fourth electronic switch means respectively comprise a first, second, third and fourth transistor, each of said transistors having a base connected to said electronic control switch means.
Claim 4
Dependent Claim
62 words
An arrangement as set forth in claim 2, wherein said electronic control switch means comprise a fifth transistor havIng an emitter, collector, and a base; and wherein said bases of said first and third transistor are connected to said collector of said fifth transistor and said bases of said second and fourth transistor are connected to said base of said fifth transistor.
Claim 5
Dependent Claim
82 words
An arrangement as set forth in claim 3, wherein said speed selector switch means comprise a mechanical switch, having an open and a closed position respectively corresponding to said first and second selector positions, for interconnecting said base of said fifth transistor to said source of electrical energy, in such a manner that said fifth transistor is in a conductive state when said mechanical switch is closed and said fifth transistor is in a non-conductive state when said mechanical switch is open.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |