Patent US3786224A successfully refreshed from Google Patents.
US3786224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing strips of insulating material having electrically conductive coatings with a coating free marginal edge surface
Assignee: Siemens AG
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Filing: 1971-07-21
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Granted: 1974-01-15
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Expires: 1991-07-21
Abstract
Abstract The present invention is directed to a method and device for removing a coating such as a metalized coating from a coated surface of a strip of insulative material by utilizing a laser beam which is directed parallel to the coated surface with its focal point position adjacent to the portion of the coated surface to be removed. Preferably the strip is either coiled in a roll with the edge portions forming a frontal surface and the roll is rotated with respect to the laser beam and shifted in a plane perpendicular to the axis of the laser beam or the strips are arranged in stacks and the laser beam and the stack are moved relatively in a back and forth direction and in a direction vertical to the back and forth direction to decoat the coated surface adjacent the edge of the strip.
Inventors
- 👤 H Heywang
- 👤 G Hoyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:14
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/08; B23K26/0823; B23K26/36; B23K26/40; H; H01; H01G; H01G13/00; H01G13/06; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49099
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
204 words
In a method for producing a strip of insulative material having an electrical conductive coating on a surface thereof with a portion of the surface adjacent an edge of the strip being free of the coating by coating the entire surface of the strip with an electrical conductive coating to provide a coated surface and subsequently removing the coating from a portion of the coated surface at an edge thereof to form an edge portion free of the coating, the improvement in the method of removing the coating comprising directing a laser beam substantially parallel to said coated surface with the focal point of the laser beam positioned at said edge of the coated surface, the wave length of the laser beam being absorbed by the coating but not absorbed by the material of the insulating strip or web and moving the laser beam and strip relative to one another to subject each increment of said edge of the coated surface to the laser beam for a short duration of less than 10 5 seconds whereby the portion of the coating subjected to the laser beam is heated to evaporate the coating from the surface to provide the edge portion free of the coating.
Claim 2
Dependent Claim
204 words
In a method for producing a strip of insulative material having an electrical conductive coating on a surface thereof with a portion of the surface adjacent an edge of the strip being free of the coating by coating the entire surface of the strip with an electrical conductive coating to provide a coated surface and subsequently removing the coating from a portion of the coated surface at an edge thereof to form an edge portion free of the coating, the improvement in the method of removing the coating comprising directing a laser beam substantially parallel to said coated surface with the focal point of the laser beam positioned at said edge of the coated surface, the wave length of the laser beam being absorbed by the coating but not absorbed by the material of the insulating strip or web and moving the laser beam and strip relative to one another to subject each increment of said edge of the coated surface to the laser beam for a short duration of less than 10 5 seconds whereby the portion of the coating subjected to the laser beam is heated to evaporate the coating from the surface to provide the edge portion free of the coating.
Claim 3
Dependent Claim
23 words
In a method according to claim 1, wherein the step of relatively moving comprises moving the strip with respect to the laser beam.
Claim 4
Dependent Claim
45 words
In a method according to claim 1, wherein the laser beam is applied as a pulsing laser beam and wherein the rate of relative movement between the strip and the laser beam is such that the focal points of successive pulses on said portion overlap.
Claim 5
Dependent Claim
29 words
In a method according to claim 3, wherein the pulsing laser beam is produced by a YAG giant pulse laser and has a wave length of 1.06 Mu .
Claim 6
Dependent Claim
104 words
A method according to claim 1, wherein prior to removing a portion of the coated surface, the method includes winding the strip with the coated surface about an axis to form a roll having the edges of the strip forming substantially planar frontal surfaces, and wherein the step of moving during the removing of a portion of the coated surface includes moving the roll and the laser beam relative to each other with the laser beam being substantially parallel to the axis of the roll, and wherein the step of directing the laser beam includes positioning said focal point at said planar frontal surfaces.
Claim 7
Dependent Claim
39 words
In a method according to claim 5, wherein the step of relative moving of the laser beam and roll comprises rotating the roll about its axis and axially shifting the laser beam and the roll relative to each other.
Claim 8
Dependent Claim
62 words
In a method according to claim 6, wherein the step of rotating the roll includes changing the speed of rotation of the roll of the wound strip as the laser beam and roll are being axially shifted relative to each other so that the rate of movement of the wound strip of insulative material relative to the laser beam remain substantially constant.
Claim 9
Dependent Claim
45 words
In a method according to claim 7, which includes maintaining the laser beam substantially stationary and wherein the step of shifting comprises shifting the axis of the roll of wound insulative strip with respect to the stationary laser beam as the roll is being rotated.
Claim 10
Dependent Claim
97 words
In a method according to claim 1, in which prior to the step of removing a portion of the coated surface, the method includes the step of stacking the strip of insulative material having the coated surface with additional strips of insulative material having coated surfaces with the edges of the strips forming a frontal surface, and wherein the moving of the laser beam relative to the strip comprises relative moving the stack of strips and the laser beam, and wherein the step of directing the laser beam includes positioning said focal point at said frontal surface.
Claim 11
Dependent Claim
66 words
In a method according to claim 9, wherein the step of relative moving the laser beam and the stack of strips comprises a step of moving in a first direction parallel to the length of the strips and a step of moving in a second direction perpendicular to the first direction and the length of the strips between successive steps of moving in the first direction.
Claim 12
Dependent Claim
48 words
In a method according to claim 10, which includes maintaining the laser beam in a stationary position and the steps of moving comprises moving said stack of strips in both the first direction of movement and the second direction of movement with respect to the stationary laser beam.
Claim 13
Independent Claim
198 words
A device for use in removing A coating from an edge portion of a coated surface of an insulative strip by applying a laser beam directed substantially parallel to the coated surface of the strip comprising a platform being supported for rotation about an axis and having a planar surface extending perpendicular to said axis for supporting a roll of the strip, means for providing a laser beam, means supporting the laser beam means in a stationary position with the laser beam directed substantially perpendicular to the planar surface and substantially parallel to said axis of rotation of the platform, means to adjust the focal point of the laser beam in a direction perpendicular to said planar surface, means for shifting the axis of rotation of the platform with respect to the laser beam, a drive wheel, and means for rotating the drive wheel at a constant speed, said drive wheel being mounted in a fixed position relative to the laser beam to engage the platform and to rotate the platform at a variable angular speed as the means shifting the axis of rotation of the platform shifts the platform relative to the drive wheel and laser beam.
Claim 14
Independent Claim
198 words
A device for use in removing A coating from an edge portion of a coated surface of an insulative strip by applying a laser beam directed substantially parallel to the coated surface of the strip comprising a platform being supported for rotation about an axis and having a planar surface extending perpendicular to said axis for supporting a roll of the strip, means for providing a laser beam, means supporting the laser beam means in a stationary position with the laser beam directed substantially perpendicular to the planar surface and substantially parallel to said axis of rotation of the platform, means to adjust the focal point of the laser beam in a direction perpendicular to said planar surface, means for shifting the axis of rotation of the platform with respect to the laser beam, a drive wheel, and means for rotating the drive wheel at a constant speed, said drive wheel being mounted in a fixed position relative to the laser beam to engage the platform and to rotate the platform at a variable angular speed as the means shifting the axis of rotation of the platform shifts the platform relative to the drive wheel and laser beam.
Claim 15
Dependent Claim
31 words
A device according to claim 12, wherein the drive wheel of a constant speed is positioned to engage the platform at a position below the focal point of the laser beam.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |