US3600588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric optical grating
Assignee: NAT RES DEV
•
Filing: 1969-12-10
•
Granted: 1971-08-17
•
Expires: 1989-12-10
Abstract
Abstract An index grating for use in measuring apparatus in which relative movement between the index grating and a scale grating is monitored, consisting of a regular series of alternate transparent and opaque regions, the opaque regions constituting parts of a solid state photocell. There is also described a reading head incorporating such an index grating.
Inventors
- 👤 Leonard Alfred Sayce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:45
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G01D5/38; G01D5/347; G01D5/34707; G01D5/34715
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
For use in optical apparatus, a transmissive index grating having alternate opaque and light transmissive elements, and in which the opaque elements of the gratings constitute parts of a solid state photocell, a first side of the grating being responsive to light and the second side of the grating being nonresponsive to light.
Claim 2
Dependent Claim
53 words
For use in optical apparatus, a transmissive index grating having alternate opaque and light transmissive elements, and in which the opaque elements of the gratings constitute parts of a solid state photocell, a first side of the grating being responsive to light and the second side of the grating being nonresponsive to light.
Claim 3
Dependent Claim
97 words
An index grating according to claim 7, comprising a transparent substrate with said opaque elements formed thereon in a regularly spaced pattern wherein said opaque elements comprises a layer of photoelectric material sandwiched between a first electrode layer of light-transmissive material and a second electrode layer, the photoelectric material being screened from light incident on the face of the grating corresponding to the second electrode layer by a layer of opaque material, means electrically connecting together the first electrode layers of all the regions, and means electrically connecting together the second electrode layers of all the regions.
Claim 4
Dependent Claim
19 words
An index grating according to claim 2, in which the layer of opaque material is said second electrode layer.
Claim 5
Dependent Claim
27 words
An index grating according to claim 2, in which the photoelectric material is cadmium sulfide having a region adjacent the first electrode layer doped with cuprous ions.
Claim 6
Dependent Claim
43 words
A reading head for use in optical apparatus of the kind specified, comprising an index grating according to claim 7 and means for causing a collimated beam of light to be incident upon said second side of the grating at nearly normal incidence.
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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |