Patent US3687028A successfully refreshed from Google Patents.
US3687028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic camera with flash mechanism
Assignee: Hittech Prontor GmbH
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Filing: 1970-12-10
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Granted: 1972-08-29
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Expires: 1990-12-10
Abstract
Abstract A photographic camera has a constant aperture objective lens, focussed by means of a range finder, and a shutter. The shutter includes a timing device which gives at least two exposure times, one of which utilizes all the light of a flash bulb, for example, and another using only a part of the light. An exposure time setting mechanism is operable on the timing device. The range finder coacts with a flash-time setting mechanism which, in turn, acts on the timing device. The exposure time setting device has a special flash setting and, when at this setting, the exposure time setting mechanism is ineffective on the timing device. The flash-time setting mechanism is cooperable with the range finder and, when the exposure time setting mechanism is in the flash setting position, the flash-time setting mechanism is effective on the timing device in accordance with the setting of the range finder, so that a short range setting of the range finder causes the flash-time setting mechanism to act on the timing device to provide a shorter exposure time, and a long range setting of the range finder causes the flash-time setting mechanism to operate the timing device to provide a longer exposure time.
Inventors
- 👤 Waldemar T Rentschler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:07
CPC Classifications
G; G03; G03B; G03B15/00; G03B15/02; G03B15/03; G03B15/04; G03B15/0452; G03B15/0478; G03B15/0494; G03B7/00; G03B7/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
180 words
A photographic camera comprising, in combination, a constant aperture objective lens; a range setter operable to focus said lens; a shutter; a timing device cooperable with said shutter to provide at least two exposure times including a first exposure time utilizing the full light emission of a flashbulb and a second exposure time using only part of the light emission of a flashbulb; a flash-time setter operatively associated with said range setter; and an exposure-time setter normally operatively associated with said timing device and operable to set exposure times for daylight exposures, said exposure-time setter having, in addition to settings corresponding to various daylight exposure times, a ''''flash'''' setting and, in said ''''flash'''' setting, being effectively disconnected from said timing device; said flash-time setter, when said exposure-time setter is in said ''''flash'''' setting, being operable, responsive to setting of a short range by said range setter, to operate said timing device to provide said second exposure time and, responsive to setting of a long range by said range setter, to operate said timing device to provide said first exposure time.
Claim 2
Dependent Claim
180 words
A photographic camera comprising, in combination, a constant aperture objective lens; a range setter operable to focus said lens; a shutter; a timing device cooperable with said shutter to provide at least two exposure times including a first exposure time utilizing the full light emission of a flashbulb and a second exposure time using only part of the light emission of a flashbulb; a flash-time setter operatively associated with said range setter; and an exposure-time setter normally operatively associated with said timing device and operable to set exposure times for daylight exposures, said exposure-time setter having, in addition to settings corresponding to various daylight exposure times, a ''''flash'''' setting and, in said ''''flash'''' setting, being effectively disconnected from said timing device; said flash-time setter, when said exposure-time setter is in said ''''flash'''' setting, being operable, responsive to setting of a short range by said range setter, to operate said timing device to provide said second exposure time and, responsive to setting of a long range by said range setter, to operate said timing device to provide said first exposure time.
Claim 3
Dependent Claim
20 words
A photographic camera according to claim 1, wherein said range setter and said flash-time setter are combined into one unit.
Claim 4
Dependent Claim
65 words
A photographic camera according to claim 2, in which said range setter is operatively associated with a guide number setter; and a guide number scale on one of said range setter and guide number setter and marks on the other of said range setter and said guide number setter to enable adjustment of the relative positions of said range setter and said guide number setter.
Claim 5
Dependent Claim
145 words
A photographic camera according to claim 1, in which said timing device is an electronically controlled timing device; a photo-resistor providing shutter time control in dependence on the ambient daylight; resistance means providing shutter time control independently of the ambient lighting; and a changeover switch selectively operable to connect either said photo-resistor or said resistance means to said timing device; said flash-time setter being connected to said range setter and operatively associated with said resistance means to select one of at least two different resistance values giving exposure times of respective different durations in the ''''light-independent'''' setting of said changeover switch, a low resistance value being associated with a short range setting of said range setter to set a short exposure time, and a higher resistance value being associated with a longer range setting of said range setter to set a relatively longer exposure time.
Claim 6
Dependent Claim
57 words
A photographic camera according to claim 4, wherein said resistance means comprises a pair of resistors connected to said changeover switch; said flash-time setter, when said range setter sets a short range, connecting both resistors in parallel with said timing device and, when said range setter sets a longer range, disconnecting one resistor from said timing device.
Claim 7
Dependent Claim
43 words
A photographic camera according to claim 4, comprising a variable resistor which varies the exposure timing and is associated said flash-time setter comprising said range setter, with a sliding contact moving over said variable resistor and coupled to rotate with the range setter.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |