US3851180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the diameter of fine wires
Assignee: Oki Electric Industry Co Ltd
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Filing: 1973-06-18
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Granted: 1974-11-26
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Expires: 1993-06-18
Abstract
Abstract In apparatus for measuring the diameter of a fine wire of the type wherein parallel laser beams are projected upon the fine wire in the diametric direction thereof so as to form a Fraunhofer diffraction image and the spacing between the peak bright spots of the diffraction image is counted, there are provided an optical filter for making the level of the signal at the optical center of the Fraunhofer diffraction image to be equal to the level of the signal subjected to a predetermined number of diffractions, and a photoelectric transducer responsive to these two signals. The output wave of the photoelectric transducer is shaped, chopped and then applied to a counter which operates to determine the distance between the centers of said two signals.
Inventors
- 👤 K Kato
- 👤 N Murata
- 👤 G Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:55
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/08; G01B11/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
Apparatus for measuring the diameter of a fine wire, comprising means for irradiating the fine wire with parallel laser beams in the diametric direction thereof thereby forming a Fraunhofer diffraction image, an opticaL filter for making the level of the signal at the optical center of said Fraunhofer diffraction image to be equal to the level of the signal subjected to a predetermined number of diffractions, a photoelectric transducer responsive to said two signals, a shaping circuit connected to the output of said photoelectric transducer, a level slicing circuit connected to the output of said shaping circuit and a counter connected to the output of said level slicing circuit, said counter operating to count and display the distance between the centers of said center signal and of said signal subjected to a predetermined number of diffractions.
Claim 2
Dependent Claim
136 words
Apparatus for measuring the diameter of a fine wire, comprising means for irradiating the fine wire with parallel laser beams in the diametric direction thereof thereby forming a Fraunhofer diffraction image, an opticaL filter for making the level of the signal at the optical center of said Fraunhofer diffraction image to be equal to the level of the signal subjected to a predetermined number of diffractions, a photoelectric transducer responsive to said two signals, a shaping circuit connected to the output of said photoelectric transducer, a level slicing circuit connected to the output of said shaping circuit and a counter connected to the output of said level slicing circuit, said counter operating to count and display the distance between the centers of said center signal and of said signal subjected to a predetermined number of diffractions.
Claim 3
Dependent Claim
52 words
The apparatus according to claim 1 which further comprises means including a rotary disc mask having a slit and a stationary light intercepting mask having a slit for detecting the positions of the bright spots of said Fraunhofer diffraction image at said optical center and subjected to said predetermined number of diffractions.
Claim 4
Dependent Claim
44 words
The apparatus according to claim 1 wherein said counter comprises means for adding each one half of the width of said center signal and of the signal subjected to said predetermined number of diffractions to the spacing between these signals thereby determining said distance.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |