Patent US3909609A successfully refreshed from Google Patents.
US3909609A
Expired / Lapsed
US
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Light source measuring apparatus
Assignee: Xerox Corp
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Filing: 1973-10-29
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Granted: 1975-09-30
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Expires: 1993-10-29
Abstract
Abstract An apparatus in which the spectral characteristics of a light source are determined. The light rays from the light source are filtered and the intensity of each of the respective filtered light rays measured. These measured characteristics are recorded indicating the peak irradiance values which may be compared to evaluate the color balance of the light source. The foregoing abstract is neither intended to define the invention disclosed in the specification, nor is it intended to be limiting as to the scope of the invention in any way.
Inventors
- 👤 Wayne L Kidd
- 👤 Edward J Majewicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:57
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/46; G01J3/50; G01J3/51; G01J1/00; G01J1/42; G01J2001/4247
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
128 words
An apparatus for determining the spectral characteristics of an elongated, substantially tubular apertured light source, including: a frame; means for measuring the spectral characteristics of the light source; at least one filter mounted on said frame and interposed between the light source and said measuring means; collimator means interposed between said filter and the light source for providing a substantially parallel beam of filtered light rays to said measuring means; means, operatively associated with said measuring means, for recording the spectral characteristics of the light source; guide means for rotatably aligning the aperture of the light source with said collimator means; and means for mounting the light source in a substantially horizontal position with the longitudinal axis thereof substantially normal to the longitudinal axis of said measuring means.
Claim 2
Independent Claim
128 words
An apparatus for determining the spectral characteristics of an elongated, substantially tubular apertured light source, including: a frame; means for measuring the spectral characteristics of the light source; at least one filter mounted on said frame and interposed between the light source and said measuring means; collimator means interposed between said filter and the light source for providing a substantially parallel beam of filtered light rays to said measuring means; means, operatively associated with said measuring means, for recording the spectral characteristics of the light source; guide means for rotatably aligning the aperture of the light source with said collimator means; and means for mounting the light source in a substantially horizontal position with the longitudinal axis thereof substantially normal to the longitudinal axis of said measuring means.
Claim 3
Dependent Claim
32 words
An apparatus as recited in claim 1, wherein said filter includes: an opaque disc having a plurality of apertures therein; and a plurality of filters mounted in the apertures of said disc.
Claim 4
Dependent Claim
28 words
An apparatus as recited in claim 2, further including means for indexing said disc so that successive filters are interposed between said measuring means and the light source.
Claim 5
Dependent Claim
31 words
An apparatus as recited in claim 3, further including first circuit means for regulating said indexing means so that the filter is interposed between said measuring means and the light source.
Claim 6
Dependent Claim
64 words
An apparatus as recited in claim 4, wherein said measuring means includes: a photosensor for detecting the intensity of the light rays transmitted through said filter, said photosensor being adapted to generate an analog signal indicative of the intensity of light rays transmitted thereto; and second circuit means, responsive to the analog signal generated by said photosensor, for producing a digital signal corresponding thereto.
Claim 7
Dependent Claim
31 words
An apparatus as recited in claim 5, wherein said recording means includes a digital recorder, responsive to the digital signal produced by said second circuit means, for printing the digital signal.
Claim 8
Dependent Claim
15 words
An apparatus as recited in claim 6, wherein said indexing means includes a stepping motor.
Claim 9
Dependent Claim
21 words
An apparatus as recited in claim 7, further including third circuit means adapted to control the energization of the light source.
Claim 10
Dependent Claim
26 words
An apparatus as recited in claim 8, wherein said plurality of filters include: a cyan filter; a blue filter; a green filter; and a red filter.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |