US3697179A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light measuring device
Assignee: P Gossen and Co GmbH
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Filing: 1971-01-18
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Granted: 1972-10-10
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Expires: 1991-01-18
Abstract
Abstract The present disclosure relates to a universally applicable light measuring device, especially photometer, which comprises a main measuring device, e.g., an exposure meter, and a plurality of easily exchangeable auxiliary measuring devices or adapters which, when individually attached to the main measuring device, form therewith new unitary devices, as to outer appearance and function. All adapters have identical bottom portions with two hook-like extensions to be received in corresponding recesses in the main measuring device. One of the extensions is resiliently journalled and may be displaced by a push button for disconnecting the adapter from the main device. Various new adapters are proposed, as for instance, an adapter for reducing the measuring angle, a dark room adapter, an adapter for determining the exposure time when taking micro-photographs, a focusing screen scanner, an adapter which transforms the main measuring device into an illumination meter, an adapter for determining the ''''color temperature'''' when taking color photographs, and an adapter for making densitometric measurements.
Inventors
- 👤 Erwin Pfaffenberger
- 👤 Hans Forsterling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:28
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/42; G01J1/4209; G01J1/4214
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
266 words
A light measuring device for phototechnical measurements comprising in combination an exposure meter and an auxiliary device for modifying light to be applied to said exposure meter, said exposure meter having a light entrance aperture on one surface thereof, an extension surrounding said one surface and forming recesses adjacent opposite sides of said one surface, and a diffuser slidably mounted with respect to said one surface whereby said diffuser may be moved into and out of alignment with said light entrance aperture, said auxiliary device having a bottom surface that conforms to the extension of said exposure meter, a fixed protrusion extending from the bottom surface and for engaging a first one of the recesses in said extension, and a movable protrusion for engaging a second one of said recesses opposite said first one of the recesses for holding said bottom surface of said auxiliary device against said extension of said exposure meter, said auxiliary device further having an aperture aligned with said light entrance aperture, manually actuatable resilient means urging said movable protrusion into said second one of the recessed for interconnecting said exposure meter and auxiliary device, actuating means for moving said movable protrusion against the thrust of said resilient means for detaching said auxiliary device upon actuation of said actuating means, said auxiliary device further having a recess formed therein out of alignment with said light entrance aperture and conforming to the shape of said diffuser, whereby said auxiliary device may be mounted on said exposure meter only when said diffuser is aligned with the recess in the bottom of said auxiliary device.
Claim 2
Dependent Claim
266 words
A light measuring device for phototechnical measurements comprising in combination an exposure meter and an auxiliary device for modifying light to be applied to said exposure meter, said exposure meter having a light entrance aperture on one surface thereof, an extension surrounding said one surface and forming recesses adjacent opposite sides of said one surface, and a diffuser slidably mounted with respect to said one surface whereby said diffuser may be moved into and out of alignment with said light entrance aperture, said auxiliary device having a bottom surface that conforms to the extension of said exposure meter, a fixed protrusion extending from the bottom surface and for engaging a first one of the recesses in said extension, and a movable protrusion for engaging a second one of said recesses opposite said first one of the recesses for holding said bottom surface of said auxiliary device against said extension of said exposure meter, said auxiliary device further having an aperture aligned with said light entrance aperture, manually actuatable resilient means urging said movable protrusion into said second one of the recessed for interconnecting said exposure meter and auxiliary device, actuating means for moving said movable protrusion against the thrust of said resilient means for detaching said auxiliary device upon actuation of said actuating means, said auxiliary device further having a recess formed therein out of alignment with said light entrance aperture and conforming to the shape of said diffuser, whereby said auxiliary device may be mounted on said exposure meter only when said diffuser is aligned with the recess in the bottom of said auxiliary device.
Claim 3
Dependent Claim
63 words
The light measuring device of claim 1 wherein said first and second recesses are constituted by opposed parts of a recess in the extension surrounding said one surface of said exposure meter and extending around the circumference of said one surface, thereby to constitute guide means for guiding the movement of said diffuser into and out of alignment with said light entrance aperture.
Claim 4
Dependent Claim
58 words
The light measuring device of claim 1 wherein said diffuser is dome shaped and extends from said one surface beyond said extension, whereby said first and second recesses in the bottom of said auxiliary measuring device hold said diffuser out of alignment with said light entrance aperture when said auxiliary measuring device is mounted on said exposure meter.
References Cited (Backward Citations)
AT156695B
Cited
US2584440A
Cited
US2585245A
Cited
US2982174A
Cited
US2995975A
Cited
US3237264A
Cited
US3360656A
Cited
US3421821A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |