US3839723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic exposure camera with overexposure and underexposure control
Assignee: Pentax Corp
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Filing: 1973-09-12
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Granted: 1974-10-01
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Expires: 1993-09-12
Abstract
Abstract A camera including selective manual and automatic electrical exposure mechanisms is provided with a common knob for selection of manual or automatic control, adjustment of manual shutter speed and adjustment of the exposure multiplier with the automatic exposure, that is normal exposure, overexposure or underposure. An indicator tape observable through the view finder and carrying indicia corresponding to shutter speed and exposure multiplier is separably coupled to the knob to shift with the rotation of the knob. The knob is coupled to an exposure control variable resistor. In adjusting the automatic exposure for different film speed ratings, the knob is raised to uncouple it from the indicator tape and is rotated to adjust it relative to an ASA scale and to correspondingly adjust the variable resistor. By adjusting the normally depressed knob in the automatic range, the exposure multiplier is adjusted and observed in the view finder.
Inventors
- 👤 N Uno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:50
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12; G03B17/00; G03B17/18; G03B17/20; G03B7/00; G03B7/003
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
97 words
In a camera including an automatic exposure control network provided with an exposure control variable resistor and a view finder, a moveable indicator observable through said view finder, a manually operable control member, first means mechanically coupling said control member to said resistor to vary the value of said resistor in response to at least one non-light exposure parameter, and second means releasably mechanically coupling said indicator to said control member and selectively uncoupling said indicator from said control member for moving said indicator with said control member when said second means is in its coupled condition.
Claim 2
Dependent Claim
97 words
In a camera including an automatic exposure control network provided with an exposure control variable resistor and a view finder, a moveable indicator observable through said view finder, a manually operable control member, first means mechanically coupling said control member to said resistor to vary the value of said resistor in response to at least one non-light exposure parameter, and second means releasably mechanically coupling said indicator to said control member and selectively uncoupling said indicator from said control member for moving said indicator with said control member when said second means is in its coupled condition.
Claim 3
Dependent Claim
35 words
The camera of claim 1 wherein said second means comprises a rotatable shaft and said control member comprises a knob coaxial with said shaft and axially moveable into and out driving engagement with said shaft.
Claim 4
Dependent Claim
36 words
The camera of claim 2 including a first disc rotatable with said shaft and having a window formed therein and a film speed indicia carrying second disc underlying said first disc and rotatable with said knob.
Claim 5
Dependent Claim
21 words
The camera of claim 3 wherein said second means includes a spring normally urging said second means to its coupled condition.
Claim 6
Dependent Claim
65 words
The camera of claim 3 wherein said indicator comprises an indicia carrying tape moveable along the focal plane of said view finder and including a spring biased take-up reel engaging one end of said tape and a string engaging the opposite end of said tape and wound upon a drum and means rotatably coupling said drum to said control member through said second coupling means.
Claim 7
Dependent Claim
62 words
The camera of claim 1 wherein said camera includes a manual exposure control mechanism and including a switch means transferrable between closed and open positions respectively activating and deenergizing said automatic control network, said control member being moveable between a first range of positions closing said switch and a second range of positions opening said switch and adjusting said manual control mechanism.
Claim 8
Dependent Claim
149 words
In an automatic-manual setting change-over means in an automatic exposure camera including a view finder and in which in coaxial relation with an automatic-manual setting change-over dial computation factors of the sensitivity value of the used film and the exposure multiplication are adjusted by relative rotation, an indication thereof being provided on said automatic-manual setting change-over dial, there is provided a tape visible through said view finder and carrying indicating information of the automatic or manual condition and exposure multiplication, said tape being connected through a transmission including pulleys and a string, with a gear which is coaxial with said automatic-manual setting change-over dial information based on the condition of said automatic-manual setting change-over dial being indicated in the view finder independent of the establishment of the sensitivity value of the used film, and there is provided an automatic-manual change-over switch which responds to said automatic-manual setting change-over dial.
Claim 9
Dependent Claim
149 words
In an automatic-manual setting change-over means in an automatic exposure camera including a view finder and in which in coaxial relation with an automatic-manual setting change-over dial computation factors of the sensitivity value of the used film and the exposure multiplication are adjusted by relative rotation, an indication thereof being provided on said automatic-manual setting change-over dial, there is provided a tape visible through said view finder and carrying indicating information of the automatic or manual condition and exposure multiplication, said tape being connected through a transmission including pulleys and a string, with a gear which is coaxial with said automatic-manual setting change-over dial information based on the condition of said automatic-manual setting change-over dial being indicated in the view finder independent of the establishment of the sensitivity value of the used film, and there is provided an automatic-manual change-over switch which responds to said automatic-manual setting change-over dial.
References Cited (Backward Citations)
DE1153244B
Cited
US3742824A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |