US3728548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring the intensity of a scanning light beam by means of a light conducting rod
Assignee: Erwin Sick GmbH Optik Elektronik
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Filing: 1972-03-23
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Granted: 1973-04-17
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Expires: 1992-03-23
Abstract
Abstract A device for measuring the intensity of a scanning light beam moving in a preferably plane face, having a transparent lightconducting rod having a front and back end and being mounted in said plane face substantially parallel to the direction of scanning of the light, the rod conducting at least one portion of the light which impinges thereupon and enters therein toward the front end by reflecting on the walls of said rod; a photoelectric receiver mounted adjacent the front end of the rod for transforming the light current reaching the front end of the rod into an electrical signal; a light-reflecting surface extending along the light-conducting rod in spaced relation on the side of the rod opposite the area of light impingement on the rod; a series of separate screens extending along the axis of the rod and interposed between the light reflecting surface and the rod, each screen being adjustable transversely of the longitudinal axis of the rod such that each screen influences in a different manner that portion of the light emerging laterally from the walls of the rod and reflected back into the rod by the light reflecting surface according to the adjustment of the respective screen as to the portion of the light reflecting surface exposed to the rod and not blocked by the screen according to the adjustment of the screen.
Inventors
- 👤 G Pinior
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:29
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/8901
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
227 words
A device for measuring the intensity of a scanning light beam moving in a preferably plane face, comprising a transparent light-conducting rod having a front and back end and being mounted in said plane face substantially parallel to the direction of scanning of the light, the rod conducting at least one portion of the light which impinges thereupon and enters therein toward the front end by reflecting on the walls of said rod; a photoelectric receiver mounted adjacent the front end of the rod for transforming the light current reaching the front end of the rod into an electrical signal; a light-reflecting surface extending along the light-conducting rod in spaced relation on the side of the rod opposite the area of light impingement on the rod; a series of separate screens extending along the axis of the rod and interposed between the light reflecting surface and the rod, each screen being adjustable transversely of the longitudinal axis of the rod such that each screen influences in a different manner that portion of the light emerging laterally from the walls of the rod and reflected back into the rod by the light reflecting surface according to the adjustment of the respective screen as to the portion of the light reflecting surface exposed to the rod and not blocked by the screen according to the adjustment of the screen.
Claim 2
Independent Claim
227 words
A device for measuring the intensity of a scanning light beam moving in a preferably plane face, comprising a transparent light-conducting rod having a front and back end and being mounted in said plane face substantially parallel to the direction of scanning of the light, the rod conducting at least one portion of the light which impinges thereupon and enters therein toward the front end by reflecting on the walls of said rod; a photoelectric receiver mounted adjacent the front end of the rod for transforming the light current reaching the front end of the rod into an electrical signal; a light-reflecting surface extending along the light-conducting rod in spaced relation on the side of the rod opposite the area of light impingement on the rod; a series of separate screens extending along the axis of the rod and interposed between the light reflecting surface and the rod, each screen being adjustable transversely of the longitudinal axis of the rod such that each screen influences in a different manner that portion of the light emerging laterally from the walls of the rod and reflected back into the rod by the light reflecting surface according to the adjustment of the respective screen as to the portion of the light reflecting surface exposed to the rod and not blocked by the screen according to the adjustment of the screen.
Claim 3
Dependent Claim
37 words
A device according to claim 1, wherein the light-conducting rod has a longitudinally extending flat surface formed thereon, and a mat surface formed along the flat surface in the region of the impingement of the scanning beam.
Claim 4
Dependent Claim
58 words
A device according to claim 2, wherein a transparent cover plate is disposed above the rod a short distance from the area of light impingement on the rod, the underside of the cover plate having a mat surface formed therein at least in the region where the scanning beam passes through the cover plate and enters the rOd.
Claim 5
Dependent Claim
24 words
A device according to claim 3, wherein the distance between each of the mat surfaces is substantially less than the diameter of the rod.
Claim 6
Dependent Claim
24 words
A device according to claim 4, wherein the distance between each of the mat surfaces is equal to the width of the mat surfaces.
Claim 7
Dependent Claim
25 words
A device according to claim 3 further comprising a screen covering the underside of the transparent cover plate except for the mat surface formed thereon.
Claim 8
Dependent Claim
28 words
A device according to claim 1 further comprising a screw spindle arrangement for each screen which is accessible from the outside of the housing for adjusting each screen.
Claim 9
Dependent Claim
37 words
A device according to claim 1 further comprising a mirror mounted adjacent the back end of the light-conducting rod for reflecting light emerging from the back end of the rod towards the front end of the rod.
Claim 10
Dependent Claim
23 words
A device according to claim 1, wherein the width of the light-reflecting surface lies between the radius and the diameter of the rod.
Claim 11
Dependent Claim
15 words
A device according to claim 1 wherein the beam of light is a laser beam.
Claim 12
Dependent Claim
52 words
A device according to claim 1 wherein the light-conducting rod is supportively mounted between the end walls of the housing on two narrow support members which are spaced at an angle of 90* relative to the longitudinal rod axis and which are symmetrical about a plane taken vertically along the longitudinal axis.
Claim 13
Dependent Claim
54 words
A device according to claim 1 further comprising a cylindrical lens of the same longitudinal length as the light-conducting rod, the lens being disposed parallel to and spaced from the rod, the lens projecting the line of impingement of a scanning beam of light reflected from a surface to be monitored onto the rod.
Claim 14
Dependent Claim
54 words
A device according to claim 2, wherein the light-conducting rod is spaced farther away from the cover plate at the end associated with the photoelectric receiver than at the opposite end such that the greater degree of absorption of the light beams which traverse a longer path in the light-conducting rod is compensated for.
Claim 15
Dependent Claim
49 words
A device according to claim 13, wherein the light-conducting rod can be slightly tipped about a transverse axis extending perpendicular to the rod axis and the impinging light beam so as to achieve more complete compensation for the different traversal times required for light to travel in the rod.
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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |