US3578979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical signal generating apparatus having a scale grid
Assignee: TAJIMA SEISAKUSHO KK
•
Filing: 1968-12-18
•
Granted: 1971-05-18
•
Expires: 1988-12-18
Abstract
Abstract When a scale grid undergoes movement relative to index grids superposed on and adhering to respective photoelectric devices, the resulting variation in a bright-dark pattern formed by the grids is detected by the photoelectric devices and converted into electrical signals, which are processed and digitally displayed or utilized for control of machines and equipment.
Inventors
- 👤 Toshiji Kawaguchi
- 👤 Takeo Tanaka
- 👤 Masaru Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/347; G01D5/34707; G01D5/34715
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
In apparatus of the type wherein a scale grid is caused to undergo movement relative to an index grid thereby to create a luminance-and-darkness pattern, and said pattern is converted into electrical signals by photoelectric means having at least one light-receiving surface thereby to detect the magnitude of said movement of said scale grid, an organization of parts in which said index grid is superposed in closely adhering state on said light-receiving surface, whereby variations in luminance and darkness created on said surface by the movement of the scale grid are converted into electrical signals corresponding to the magnitude of said movement.
Claim 2
Dependent Claim
102 words
In apparatus of the type wherein a scale grid is caused to undergo movement relative to an index grid thereby to create a luminance-and-darkness pattern, and said pattern is converted into electrical signals by photoelectric means having at least one light-receiving surface thereby to detect the magnitude of said movement of said scale grid, an organization of parts in which said index grid is superposed in closely adhering state on said light-receiving surface, whereby variations in luminance and darkness created on said surface by the movement of the scale grid are converted into electrical signals corresponding to the magnitude of said movement.
Claim 3
Dependent Claim
24 words
An organization of parts as claimed in claim 1 in which the index grid is printed on the light-receiving surface of the photoelectric means.
Claim 4
Dependent Claim
29 words
An organization of parts as claimed in claim 1 in which the index grid is borne on a photographic film bonded to the light-receiving surface of the photoelectric means.
Claim 5
Dependent Claim
25 words
An organization of parts as claimed in claim 1 in which the index grid is directly photoprinted to the light-receiving surface of the photoelectric means.
Claim 6
Dependent Claim
90 words
An organization of parts as claimed in claim 1, in which the output sides of the photoelectric elements are connected to a signal processing circuit comprising amplifiers for amplifying the outputs of corresponding photoelectric elements, a comparison circuit for comparing the outputs of said amplifiers, discriminating the direction of movement of the scale grid, and thereby generating corresponding command signals, and a reversible counter for operating in response to said command signals to carry out the command operation of the number of input signals and thereby to generate electrical signals.
Claim 7
Dependent Claim
45 words
An organization of parts as claimed in claim 1, in which the index grid has a plural number n of rows of black and white stripes with a constant grid pitch P, said rows being superposed on the light-receiving surfaces of respectively corresponding photoelectric elements.
Claim 8
Dependent Claim
24 words
An organization of parts as claimed in claim 6 in which the n rows are successively staggered in pitch phase by increments of P/n.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |