US3681605A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric device for the determination of the position of line markings
Assignee: Dr Johannes Heidenhain GmbH
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Filing: 1970-08-04
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Granted: 1972-08-01
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Expires: 1990-08-04
Abstract
Abstract A photo-electric device for the determination of the position of line markings with a swinging element in a way path, through which a light stream impinging upon a photo-electronic element is periodically varied, which comprises a swinging element and a switch controlled by the movement of the swinging element. A photo-electronic element emits and electric output signal. Two channels are provided and the switch connects alternately the electric output signal with one of the channels. The switching takes place at about the turning point of the swinging element, so that the reciprocation of the swinging element causes a series of impulses in the two separate channels. Means are provided for the determination of the relative phase position of two harmonic oscillations of equal frequency, contained in each of said series of said impulses.
Inventors
- 👤 Walter Schmitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:19
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/36
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
235 words
A photo-electric device for the determination of the position of line markings adapted to be used with a swinging element in a path through which a light stream impinging upon a photoelectronic element is periodically varied, comprising a switch adapted to be controlled by the movement of said swinging element, a photo-electronic element means emitting an electric output signal and adapted to be dependent on the light variation caused by said swinging element and an image of a line marking in the swinging plane of the swinging element, two separate channels, said switch connecting alternately said electric output signal with one of said channels, means for causing the connecting alternately of said electric output signal with one of said channels to take place at about the back and fourth swinging turning point of said swinging element, so that the reciprocation of said swinging element causes a series of impulses in said two separate channels, means for the determination of the relative phase position of two harmonic oscillations of equal frequency, contained in each of said series of said impulses including means for production of harmonic oscillations from an excitement frequency of said swinging element, and a phase slide means each for said harmonic oscillation for bringing about said harmonic oscillation produced from the excitement frequency into a fixed phase relation relative to harmonic oscillations of equal frequency contained in both of said series of impulses.
Claim 2
Dependent Claim
235 words
A photo-electric device for the determination of the position of line markings adapted to be used with a swinging element in a path through which a light stream impinging upon a photoelectronic element is periodically varied, comprising a switch adapted to be controlled by the movement of said swinging element, a photo-electronic element means emitting an electric output signal and adapted to be dependent on the light variation caused by said swinging element and an image of a line marking in the swinging plane of the swinging element, two separate channels, said switch connecting alternately said electric output signal with one of said channels, means for causing the connecting alternately of said electric output signal with one of said channels to take place at about the back and fourth swinging turning point of said swinging element, so that the reciprocation of said swinging element causes a series of impulses in said two separate channels, means for the determination of the relative phase position of two harmonic oscillations of equal frequency, contained in each of said series of said impulses including means for production of harmonic oscillations from an excitement frequency of said swinging element, and a phase slide means each for said harmonic oscillation for bringing about said harmonic oscillation produced from the excitement frequency into a fixed phase relation relative to harmonic oscillations of equal frequency contained in both of said series of impulses.
Claim 3
Dependent Claim
189 words
The device as set forth in claim 1 including means for dividing the period duration of said harmonics from the excitement frequency into four successive time section for the comparison of the phase positions and of the amplitudes of the harmonic from the series of impulses and the corresponding harmonics from the excitement frequency, means for superimposing and filtering a signal of the harmonics from the excitement frequency and the harmonics of the series of impulses, a first integrating member connected to receive the filtered superposed signal of the harmonics from the excitement frequency and the harmonics of the series of impulses fed by a first and a third of said time sections, a second integrating member connected to receive said filtered superposed signal fed by a second and a fourth of said time sections, and a first operating setting means controlled by the output of said first integrating member for controlling the phase of the harmonics from the excitement frequency, and a second operating setting means controlled by the output of said second integrating member and for controlling the amplitude of the harmonic derived from the excitement frequency.
Claim 4
Dependent Claim
123 words
The device, as set forth in claim 2, which includes a second switch connected to and feeding said filtered superposed signal to said integrating members, four logic connection means for controlling the switching of said second switch, two impulse former triggers connected to the output of said phase slides, respectively, and for each producing one rectangular voltage signal and invert thereof from said harmonics derived from the excitement frequency such that they have a scanning ratio of 1:1 and a relative phase position of about 90* and conduit means for feeding all the possible different combinations of said rectangular voltage and inverts thereof, one from each of said impulse former triggers to each of said four logic connection means for controlling the latter.
Claim 5
Dependent Claim
56 words
The device, as set forth in claim 2, including a phase comparison means for comparing said harmonic from one channel which is controlled in relation to its phase position by the excitement frequency with the corresponding controlled harmonic from the other channel for the formation of a measuring value for the position of the line markings.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |