US4037235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure indicating device for use in multiple exposure control cameras
Assignee: Minolta Co Ltd
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Filing: 1975-12-02
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Granted: 1977-07-19
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Expires: 1995-12-02
Abstract
Abstract An exposure indicating device for use in a multiple exposure control camera is capable of indicating the diaphragm aperture value and the shutter speed which are to be effected, respectively. With the diaphragm aperture value manually set, and with the shutter speed automatically controlled, the shutter speed to be effected by a control circuit is indicated by a meter pointer and a shutter speed scale member. With the shutter speed manually selected and the diaphragm aperture value automatically controlled, an aperture value indicating member includes an indicating portion and is movable relative to the shutter-speed scale member to indicate the manually set shutter speed indicating portion, and the diaphragm aperture value to be automatically controlled is indicated by a meter pointer on the aperture value indicating member.
Inventors
- 👤 Hiroshi Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:36
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/18; G03B17/20; G03B7/00; G03B7/08; G03B7/081; G03B7/087
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
272 words
An exposure indicating device for a camera of the type having a multiple exposure control system for automatically controlling shutter speed in accordance with scene brightness measured through a manually or automatically adjusted diaphragm aperture adapted to be adjusted from a fully closed setting to a fully open setting, said indicating device comprising: shutter speed setting means settable to an automatic shutter speed control position or to one of a plurality of manually selected positions; light responsive circuit means for generating a first output representative of scene brightness measured through the diaphragm aperture; means for setting the film speed value; adjusting means for adjusting said first output in accordance with said film speed value setting and generating a second output as a result thereof; diaphragm value presetting means settable to one of a plurality of manually selected positions with the diaphragm aperture fully open; second adjusting means responsive to the setting of said diaphragm presetting means for generating a third output including said second output; an indicating means actuated in response to said third output, a first scale member including a shutter speed scale, said indicating means indicating the shutter speed to be effected on said shutter speed scale with the preset diaphragm aperture; a second scale member movable relative to said first scale member and said indicating means in accordance with the position of said shutter speed setting means and including a first portion for indicating the set shutter speed on said shutter speed scale, said second scale member further including a diaphragm scale, said indicating means also indicating the diaphragm aperture to be automatically determined with said set shutter speed.
Claim 2
Dependent Claim
272 words
An exposure indicating device for a camera of the type having a multiple exposure control system for automatically controlling shutter speed in accordance with scene brightness measured through a manually or automatically adjusted diaphragm aperture adapted to be adjusted from a fully closed setting to a fully open setting, said indicating device comprising: shutter speed setting means settable to an automatic shutter speed control position or to one of a plurality of manually selected positions; light responsive circuit means for generating a first output representative of scene brightness measured through the diaphragm aperture; means for setting the film speed value; adjusting means for adjusting said first output in accordance with said film speed value setting and generating a second output as a result thereof; diaphragm value presetting means settable to one of a plurality of manually selected positions with the diaphragm aperture fully open; second adjusting means responsive to the setting of said diaphragm presetting means for generating a third output including said second output; an indicating means actuated in response to said third output, a first scale member including a shutter speed scale, said indicating means indicating the shutter speed to be effected on said shutter speed scale with the preset diaphragm aperture; a second scale member movable relative to said first scale member and said indicating means in accordance with the position of said shutter speed setting means and including a first portion for indicating the set shutter speed on said shutter speed scale, said second scale member further including a diaphragm scale, said indicating means also indicating the diaphragm aperture to be automatically determined with said set shutter speed.
Claim 3
Dependent Claim
60 words
An exposure indicating device as in claim 1, wherein said indicating means includes a movable element positioned in response to said third output, said movable element indicating the shutter speed to be effected on said shutter speed scale with the preset diaphragm aperture, and the diaphragm aperture on said diaphragm scale to be automatically determined with said set shutter speed.
Claim 4
Dependent Claim
60 words
An exposure indicating device as in claim 2, wherein said device further comprises means for generating a fourth output as a function of said set shutter speed, means for comparing said second output with said fourth output, and second indicating means responsive to said means for comparison for providing a visual indication when said fourth output exceeds said second output.
Claim 5
Dependent Claim
48 words
An exposure indicating device as in claim 3, wherein said second indicating means includes an electrical element for emitting light and said comparing means includes a differential amplifier responsive to said second and fourth outputs for actuating said electrical element when said fourth output exceeds said third output.
Claim 6
Dependent Claim
32 words
An exposure indicating device as in claim 2, wherein said indicating means includes an exposure meter and said movable element is the pointer thereof being deflected in response to said third output.
Claim 7
Dependent Claim
145 words
An exposure indicating device as in claim 5, wherein said second scale member is rotatable concentrically with said pointer and said shutter speed scale includes shutter speed graduations arranged in descending order from the highest shutter speed to the lowest shutter speed, said diaphragm scale including aperture setting graduations with said fully closed aperture setting graduation located adjadent said first portion, and the remaining aperture graduations being located in ascending order to said fully open setting, said aperture setting graduations being spaced to be in substantial alignment with said shutter speed graduations with said second scale member overlapping said first scale member, whereby the position of said pointer indicates the difference between said set diaphragm aperture and that diaphragm aperture to be automatically controlled with said set shutter speed, and also the difference between said set shutter speed and the shutter speed to be effected.
Claim 8
Dependent Claim
38 words
An exposure indicating device as in claim 6, wherein said second scale member includes a semi-transparent portion for covering the slower shutter speeds on said first scale member than the manually selected one indicated by said first portion.
Claim 9
Dependent Claim
44 words
An exposure indicating device as in claim 6, wherein said second scale member includes a colored portion for covering the slower shutter speeds on said first scale member than the scale of the portion of the manually selected one indicated by said first portion.
Claim 10
Dependent Claim
77 words
An exposure control device as in claim 6, wherein with said diaphragm value presetting means settable to said fully closed aperture setting and said shutter speed setting means set to one of said plurality of manually selected positions, said pointer is positioned to indicate a higher shutter speed on said first scale member than said manually selected shutter speed with the scene brightness such that there is no proper aperture setting for said set shutter speed setting.
Claim 11
Dependent Claim
76 words
An exposure indicating device as in claim 6 with said diaphragm value presetting means set to said fully open setting, and said shutter speed setting means set to one of said plurality of manually selected positions, said pointer is positioned to indicate a lower shutter speed setting on said first scale member than said selected shutter speed setting with said scene brightness such that there is no proper aperture setting for said set shutter speed setting.
Claim 12
Dependent Claim
66 words
An exposure indicating device as in claim 10, wherein said device further comprises means for generating a fourth output as a function of said set shutter speed, means for comparing said second output with said fourth output and said second indicating means is responsive to said means for comparison for providing a visual indication with said indicated lower shutter equal to or less than 1/30 second.
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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |