US3973119A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for determining the displacement of a machine tool component
Assignee: US Philips Corp
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Filing: 1975-03-10
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Granted: 1976-08-03
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Expires: 1995-03-10
Abstract
Abstract A device is described for determining the linear displacement of a machine tool component with the aid of a grating which is mechanically connected to the component, which grating is disposed in the light path between a light source and a light-sensitive element which converts the incident light into an electric signal. The light-sensitive element is a multiple photo-cell which consists of a row of line-shaped photo-diodes which by means of an electrical switch are consecutively connected to an electronic circuit which processes the signal which is produced in the photo-diodes.
Inventors
- 👤 Hendrik Renes
- 👤 Joannes Gregorius Bremer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:56
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/347; G01D5/34707; G01D5/34715
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
137 words
A device for determining the displacement of a machine tool component, comprising a periodic grating mechanically attached to the component, a radiation source means for projecting radiation onto said grating, a plurality of aligned photo-cells arranged sequentially in ordered groups of at least two photo-cells, means for projecting an image of a portion of the grating onto said photo-cells, each period of said projected grating image spanning one of said groups of said photo-cells, and interrogating means for periodically sequentially activating the photo-cells in each of said ordered groups of photo-cells and for simultaneously activating each of the photo-cells of an activated order, whereby a plurality of photo-cells having substantially the same spacing as the period of said grating image are simultaneously activated and whereby the location of said activated photo-cells periodically shifts in a predetermined direction.
Claim 2
Independent Claim
137 words
A device for determining the displacement of a machine tool component, comprising a periodic grating mechanically attached to the component, a radiation source means for projecting radiation onto said grating, a plurality of aligned photo-cells arranged sequentially in ordered groups of at least two photo-cells, means for projecting an image of a portion of the grating onto said photo-cells, each period of said projected grating image spanning one of said groups of said photo-cells, and interrogating means for periodically sequentially activating the photo-cells in each of said ordered groups of photo-cells and for simultaneously activating each of the photo-cells of an activated order, whereby a plurality of photo-cells having substantially the same spacing as the period of said grating image are simultaneously activated and whereby the location of said activated photo-cells periodically shifts in a predetermined direction.
Claim 3
Dependent Claim
64 words
A device as recited in claim 1, wherein said interrogating means comprises a clock pulse generator, a ring counter connected to said clock pulse generator, means connecting said ring counter to said photo-cells, said device further comprising a counting device connected to the output of said photo-cells and to said clock pulse generator for comparing said clock pulses with the output of said photo-cells.
Claim 4
Dependent Claim
48 words
A device as recited in claim 2, wherein said device further comprises a divider means for periodically simultaneously providing reset pulses to said ring counter and to said counting device after a predetermined number of clock pulses are applied to said ring counter and to said counting device.
References Cited (Backward Citations)
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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) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |