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US5026964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical breakthrough sensor for laser drill
Assignee: General Electric Co
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Filing: 1986-02-28
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Granted: 1991-06-25
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Expires: 2006-02-28
Abstract
Abstract An apparatus and method for detecting when a hole has been drilled through a workpiece by way of a pulse laser drilling process having a machine control for controlling whether the pulse laser drill emits laser pulses. The apparatus detects the laser pulse and produces an output signal representative thereof. The output signal is clipped and compared to a first reference signal for producing a compared output signal when the clipped output signal is greater than the first reference signal. The compared output signal triggers an enabling output signal representative of a pulse having a predetermined interval. The apparatus also detects reflected radiation from an entrance of the hole being drilled to produce an output signal which is then clipped and compared to a second reference signal to produce a disabling output signal when the output signal representative of the reflected radiation is greater than the second reference signal. When the disabling signal terminates before the enabling signal a gating pulse indicative of when a hole is drilled is generated for stopping any further laser pulse.
Inventors
- 👤 Ralph M. Somers
- 👤 Diana R. Compton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:18
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/02; B23K26/03; B23K26/032; B08; B08B; B08B7/00; B08B7/0035; B08B7/0042; B23K26/36; B23K26/38; B23K26/382; B23K26/389; B23K26/40; B23K2103/00; B23K2103/50
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
143 words
In a pulse laser drilling process having a machine control for controlling a laser, an apparatus to detect when a hole is drilled through a workpiece comprising: (a) first monitoring means for detecting a laser pulse and producing an output signal representative thereof; (b) second monitoring means for detecting reflected radiation from an entrance of the hole being drilled and producing an output signal representative thereof; and (c) evaluating means having a first input for receiving the output signal from said first monitoring means and a second input for receiving the output signal from said second monitoring means, said evaluating means effective for (1) comparing said output signals from said first and second monitoring means and effective for (2) producing an output signal indicative of when a through hole is completed for indicating to the machine control to stop any further laser pulse.
Claim 2
Dependent Claim
143 words
In a pulse laser drilling process having a machine control for controlling a laser, an apparatus to detect when a hole is drilled through a workpiece comprising: (a) first monitoring means for detecting a laser pulse and producing an output signal representative thereof; (b) second monitoring means for detecting reflected radiation from an entrance of the hole being drilled and producing an output signal representative thereof; and (c) evaluating means having a first input for receiving the output signal from said first monitoring means and a second input for receiving the output signal from said second monitoring means, said evaluating means effective for (1) comparing said output signals from said first and second monitoring means and effective for (2) producing an output signal indicative of when a through hole is completed for indicating to the machine control to stop any further laser pulse.
Claim 3
Dependent Claim
196 words
The apparatus of claim 1, wherein said evaluating means comprise: (a) first comparing means having a first input for receiving the output signal from said first monitoring means and a second input for receiving a first reference signal, said first comparing means producing an output signal when an output signal from said first monitoring means exceeds the first reference signal; (b) pulsing means having an input for receiving the output signal from said first comparing means, said pulsing means producing an enabling output signal representative of a pulse having a predetermined interval when an output signal is produced by said first comparing means; (c) second comparing means having a first input for receiving the output signal from said second monitoring means and a second input for receiving a second reference signal, said second comparing means producing a disabling output signal representative of a pulse when an output signal from said second monitoring means exceeds the second reference signal; and (d) gating means having a first input for receiving the enabling signal and a second input for receiving the disabling signal, said gating means generating a gating pulse when the disabling signal terminates before the enabling signal.
Claim 4
Dependent Claim
32 words
The apparatus of claim 2, wherein the output pulse from said pulsing means is triggered by a signal representative of a trailing edge of the output signal from said first comparing means.
Claim 5
Dependent Claim
24 words
The apparatus of claim 2, wherein the disabling signal terminates before the enabling signal only when a through hole is drilled through the workpiece.
Claim 6
Dependent Claim
15 words
The apparatus of claim 2, wherein said first comparing means comprises a non-inverting type comparator.
Claim 7
Dependent Claim
15 words
The apparatus of claim 2, wherein said second comparing means comprises an inverting type comparator.
Claim 8
Dependent Claim
13 words
The apparatus of claim 2 wherein said pulsing means comprises a monostable multivibrator.
Claim 9
Dependent Claim
13 words
The apparatus of claim 2, wherein said gating means comprises an AND gate.
Claim 10
Dependent Claim
38 words
The apparatus of claim 1, wherein said first monitoring means comprise: (a) a first photodetector which detects the laser pulse and produces an electric potential; and (b) limiting means for clipping the electric potential from said first photodetector.
Claim 11
Dependent Claim
39 words
The apparatus of claim 1, wherein said second monitoring means comprise: (a) a photodetector which detects reflected radiation from the workpiece and produces an electric potential; and (b) limiting means for clipping the electric potential from said second photodetector.
Claim 12
Independent Claim
310 words
An apparatus for detecting when a hole is drilled through a workpiece by way of a pulse laser drilling process having a machine control for controlling whether the pulse laser drill emits laser pulses comprising: (a) first monitoring means which detects the laser pulse and produces an output signal representative thereof; (b) first limiting means for clipping the output signal from said first monitoring means; (c) first comparing means having a first input for receiving the clipped output signal from said first monitoring means and a second input for receiving a first reference signal, said first comparing means producing an output signal when an output signal from said first monitoring means exceeds the first reference signal; (d) pulsing means having an input, said pulsing means receiving the output signal from said first comparing means for producing an enabling output signal representative of a pulse having a predetermined interval when an output signal is produced by said first comparing means; (e) second monitoring means which detects reflected radiation from the entrance of the hole being drilled and produces an output signal representative thereof; (f) second limiting means for clipping the output signal from said second monitoring means; (g) second comparing means having a first input for receiving the clipped output signal from said second monitoring means and a second input for receiving a second reference signal, said second comparing means producing a disabling output signal representative of a pulse when the clipped output signal from said second monitoring means exceeds the second reference signal; and (h) gating means having a first input for receiving the enabling signal and a second input for receiving the disabling signal, said gating means generating a gating pulse indicative of when a hole is drilled for indicating to the machine control to stop any further laser pulse when the disabling signal terminates before the enabling signal.
Claim 13
Independent Claim
310 words
An apparatus for detecting when a hole is drilled through a workpiece by way of a pulse laser drilling process having a machine control for controlling whether the pulse laser drill emits laser pulses comprising: (a) first monitoring means which detects the laser pulse and produces an output signal representative thereof; (b) first limiting means for clipping the output signal from said first monitoring means; (c) first comparing means having a first input for receiving the clipped output signal from said first monitoring means and a second input for receiving a first reference signal, said first comparing means producing an output signal when an output signal from said first monitoring means exceeds the first reference signal; (d) pulsing means having an input, said pulsing means receiving the output signal from said first comparing means for producing an enabling output signal representative of a pulse having a predetermined interval when an output signal is produced by said first comparing means; (e) second monitoring means which detects reflected radiation from the entrance of the hole being drilled and produces an output signal representative thereof; (f) second limiting means for clipping the output signal from said second monitoring means; (g) second comparing means having a first input for receiving the clipped output signal from said second monitoring means and a second input for receiving a second reference signal, said second comparing means producing a disabling output signal representative of a pulse when the clipped output signal from said second monitoring means exceeds the second reference signal; and (h) gating means having a first input for receiving the enabling signal and a second input for receiving the disabling signal, said gating means generating a gating pulse indicative of when a hole is drilled for indicating to the machine control to stop any further laser pulse when the disabling signal terminates before the enabling signal.
Claim 14
Dependent Claim
18 words
The apparatus of claim 11, wherein said first and second monitoring means respectively comprise first and second photodetectors.
Claim 15
Dependent Claim
15 words
The apparatus of claim 12, wherein said first comparing means comprises a non-inverting type comparator.
Claim 16
Dependent Claim
15 words
The apparatus of claim 13, wherein said second comparing means comprise an inverting type comparator.
Claim 17
Dependent Claim
13 words
The apparatus of claim 14, wherein said pulsing means comprise a monostable multivibrator.
Claim 18
Dependent Claim
13 words
The apparatus of claim 15, wherein said gating means comprise an AND gate.
Claim 19
Independent Claim
224 words
A method for detecting when a hole has been drilled through a workpiece by way of a pulse laser drilling process having a machine control for controlling whether the pulse laser drill emits laser pulses comprising the steps of: (a) detecting the laser pulse and producing an output signal representative thereof; (b) clipping the output signal representative of the laser pulse; (c) comparing the clipped output signal representative of the laser pulse to a first reference signal in order to produce a compared output signal when the clipped output signal is greater than the first reference signal; (d) triggering, with the compared output signal, an enabling output signal representative of a pulse having a predetermined interval; (e) detecting reflected radiation from the entrance of the hole being drilled to produce an output signal representative thereof; (f) clipping the output signal representative of the reflected radiation; (g) comparing the clipped output signal representative of the reflected radiation to a second reference signal in order to produce a disabling output signal representative of a pulse when the clipped output signal representative of the reflected radiation is greater than the second reference signal; and (h) generating a gating pulse indicative of when a hole is drilled to the machine control in order to stop any further laser pulse when the disabling signal terminates before the enabling signal.
Claim 20
Independent Claim
224 words
A method for detecting when a hole has been drilled through a workpiece by way of a pulse laser drilling process having a machine control for controlling whether the pulse laser drill emits laser pulses comprising the steps of: (a) detecting the laser pulse and producing an output signal representative thereof; (b) clipping the output signal representative of the laser pulse; (c) comparing the clipped output signal representative of the laser pulse to a first reference signal in order to produce a compared output signal when the clipped output signal is greater than the first reference signal; (d) triggering, with the compared output signal, an enabling output signal representative of a pulse having a predetermined interval; (e) detecting reflected radiation from the entrance of the hole being drilled to produce an output signal representative thereof; (f) clipping the output signal representative of the reflected radiation; (g) comparing the clipped output signal representative of the reflected radiation to a second reference signal in order to produce a disabling output signal representative of a pulse when the clipped output signal representative of the reflected radiation is greater than the second reference signal; and (h) generating a gating pulse indicative of when a hole is drilled to the machine control in order to stop any further laser pulse when the disabling signal terminates before the enabling signal.
References Cited (Backward Citations)
US4087672A
Cited
US4417179A
Cited
US4476512A
Cited
US4564012A
Cited
US4633058A
Cited
JPS58205689A
Cited
US4576480A
Cited
US4627725A
Cited
US4608480A
Cited
US4663513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-24 | 1994-12-24 | 1995-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-24 | 1998-12-24 | 1999-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-24 | 2002-12-24 | 2003-06-25 | $7700.00 | Window Closed / Lapsed |