US3653768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the range of vision by comparing a direct and dispersed beam of light
Assignee: Eltro GmbH and Co
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Filing: 1971-02-16
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Granted: 1972-04-04
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Expires: 1991-02-16
Abstract
Abstract A method and apparatus is disclosed which is usable in measuring the range of vision and comprises emitting a light beam from a transmitter for reception by a distant photoelectric receiver and indication on an indicator. A diaphragm serves to alternately feed to the receiver the direct light beam from the transmitter, and the combination of the direct light beam and a dispersed beam and the intensities of the signals are compared and indicated by the indicator.
Inventors
- 👤 Franz Menke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:24
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/49; G01N21/53; G01N21/538
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
179 words
A device for measurement of range of vision comprising a transmitting device for emission of a light beam, a receiving device spaced a distance from the transmitting device for receiving the light beam therefrom, said receiving device including photoelectric means for converting the light beam into an electrical signal, a stationary diaphragm and a rotatable diaphragm arranged in front of the photoelectric means, said stationary diaphragm being provided with a first opening for entry of direct light from the transmitting device and a second opening for entry of dispersed light, said rotatable diaphragm being of semi-circular shape to alternately cover and uncover said second opening during each revolution of said rotatable diaphragm, a first storage means for receiving direct light signals from said photoelectric means, a second storage means for receiving the sum of the direct light signals and the dispersed light signals, switch means for alternately supplying the direct signals to the first storage means and the sum of the direct and dispersed light signals to the second storage means and indication means coupled to the storage means.
Claim 2
Independent Claim
179 words
A device for measurement of range of vision comprising a transmitting device for emission of a light beam, a receiving device spaced a distance from the transmitting device for receiving the light beam therefrom, said receiving device including photoelectric means for converting the light beam into an electrical signal, a stationary diaphragm and a rotatable diaphragm arranged in front of the photoelectric means, said stationary diaphragm being provided with a first opening for entry of direct light from the transmitting device and a second opening for entry of dispersed light, said rotatable diaphragm being of semi-circular shape to alternately cover and uncover said second opening during each revolution of said rotatable diaphragm, a first storage means for receiving direct light signals from said photoelectric means, a second storage means for receiving the sum of the direct light signals and the dispersed light signals, switch means for alternately supplying the direct signals to the first storage means and the sum of the direct and dispersed light signals to the second storage means and indication means coupled to the storage means.
Claim 3
Dependent Claim
17 words
A device according to claim 1 comprising an amplifier between said switch means and said photoelectric means.
Claim 4
Dependent Claim
20 words
A device according to claim 1 wherein said switch means comprises a commutator driven in synchronization with said rotatable diaphragm.
Claim 5
Dependent Claim
28 words
A device according to claim 1 comprising an objective disposed in front of said diaphragms for focussing the light beam from the transmitting device to said photoelectric means.
Claim 6
Dependent Claim
22 words
A device according to claim 1 wherein said transmitting device includes a light source and a modulator for producing spaced light pulses.
Claim 7
Dependent Claim
40 words
A device according to claim 5 comprising a reference amplifier connected to the first amplifier and in parallel with the first storage means to forward to said first storage means a direct light signal always having a value of unity.
Claim 8
Dependent Claim
23 words
A device according to claim 6 comprising means connecting the reference amplifier and the light source to control the intensity of the latter.
References Cited (Backward Citations)
US3415984A
Cited
US3420609A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |