US3748043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric interpolating arrangement for reading displacements of divided scales
Assignee: Warner and Swasey Co
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Filing: 1972-03-20
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Granted: 1973-07-24
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Expires: 1992-03-20
Abstract
Abstract An arrangement is disclosed for providing interpolation between readouts of displacements of a divided scale with respect to a reference location in a reading system which includes photosensing and counting of magnified images of scale graduations relatively moving with respect to the reference location. This arrangement accomplishes interpolation between counts of successive graduations by means for projecting an image of a series of scale graduations onto a series of photosensors which have a vernier spacing relationship with the series image so that the particular photosensor in the series registering with a graduation image provides an indication of the fractional displacements of the scale relative to the reference location.
Inventors
- 👤 R Zipin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:52
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
An interpolating arrangement for a system of reading displacements of divided scales which includes means for photosensing and counting of images of scale graduations relatively moving with respect to a reference location, the arrangement comprising: a series of photosensing means; image forming means for projecting an image of a series of scale graduations onto and aligned with said series of photosensing means; said image of said series of scale graduation image being such that N scale graduation images along said series just occupies the space of N + 1 of said photosensing means along said series; indicating means for indicating the particular photosensing means in said series aligning with a graduation image, whereby fractional displacements of said scale images relative said reference location are indicated by the particular photosensor means aligned with said graduation image.
Claim 2
Dependent Claim
135 words
An interpolating arrangement for a system of reading displacements of divided scales which includes means for photosensing and counting of images of scale graduations relatively moving with respect to a reference location, the arrangement comprising: a series of photosensing means; image forming means for projecting an image of a series of scale graduations onto and aligned with said series of photosensing means; said image of said series of scale graduation image being such that N scale graduation images along said series just occupies the space of N + 1 of said photosensing means along said series; indicating means for indicating the particular photosensing means in said series aligning with a graduation image, whereby fractional displacements of said scale images relative said reference location are indicated by the particular photosensor means aligned with said graduation image.
Claim 3
Dependent Claim
54 words
The arrangement of claim 1 wherein said series of photosensing means comprises ten photosensor means and wherein said image forming means projects an imagE of said series of scale graduations such that nine of said scale graduation images just occupies the space of said ten photosensors, whereby said fractional positions in tenths is provided.
Claim 4
Dependent Claim
65 words
The arrangement of claim 2 wherein said system of reading relative displacement of scales includes means counting registrations of one of said photosensor means with scale images, and means for displaying said count, and wherein said indicating means includes means displaying said fractional diplacements together with said count display whereby a decimal display of the relative displacement of said scale and reference location is provided.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |