US3814523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo-electric densitometer
Assignee: Konica Minolta Inc
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Filing: 1972-07-07
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Granted: 1974-06-04
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Expires: 1992-07-07
Abstract
Abstract An improved portable type of photo-electric densitometer, which contains a photometer section as well as display means within its main body, and in which one of the legs of the main body is provided with a light inlet opening which functions, when said densitometer is placed on a sheet carrying an image thereon, as an optical path for leading the light transmitted through the sheet portion beneath said particular one leg to a photo-electric element in said photometer section to give a direct reading of the image density at said sheet portion on said display means.
Inventors
- 👤 T Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:57
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/59; G01N21/5907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A photoelectric densitometer for placement on a sheet carrying an image thereon for measuring its density and which utilizes a light source, said photoelectric densitometer comprising at least three legs for steadying said densitometer, and a photometer section, at least one of said legs having a single opening therein for permitting light to enter said one leg said one leg being positioned on said sheet to prevent stray light from entering the densitometer, said one leg serving also as a part of the photometer section, said photometer section comprising a photoelectric element having an output responsive to the light falling thereon and being mounted so as to receive the light entering through said one leg, amplifier means for logarithmically converting and amplifying the output response signal from said photoelectric element, a meter connected to the output circuit of said amplifier means and having a uniform image density scale, zero point adjust means for said meter, and compensating circuitry for obtaining a difference signal between the logarithmically converted output signal and a reference signal.
Claim 2
Dependent Claim
173 words
A photoelectric densitometer for placement on a sheet carrying an image thereon for measuring its density and which utilizes a light source, said photoelectric densitometer comprising at least three legs for steadying said densitometer, and a photometer section, at least one of said legs having a single opening therein for permitting light to enter said one leg said one leg being positioned on said sheet to prevent stray light from entering the densitometer, said one leg serving also as a part of the photometer section, said photometer section comprising a photoelectric element having an output responsive to the light falling thereon and being mounted so as to receive the light entering through said one leg, amplifier means for logarithmically converting and amplifying the output response signal from said photoelectric element, a meter connected to the output circuit of said amplifier means and having a uniform image density scale, zero point adjust means for said meter, and compensating circuitry for obtaining a difference signal between the logarithmically converted output signal and a reference signal.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |