IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0066852
(2002-02-04)
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발명자
/ 주소 |
- Shkolnikow, Yury
- Weinger, Murry
- Miears, Shane
- Reinhart, Michael A.
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출원인 / 주소 |
|
대리인 / 주소 |
Soltis, Lisa M.Crain, Mark W.Poreh, Donald J.
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인용정보 |
피인용 횟수 :
3 인용 특허 :
2 |
초록
▼
A combustion-powered tool having a workpiece contacting element movable relative to the tool as the tool is depressed prior to firing includes a spark unit having a high voltage spark supply for providing an ignition spark, a printed circuit board having a first portion configured for receiving and
A combustion-powered tool having a workpiece contacting element movable relative to the tool as the tool is depressed prior to firing includes a spark unit having a high voltage spark supply for providing an ignition spark, a printed circuit board having a first portion configured for receiving and being electrically connected to the high voltage spark supply, and a second portion configured for receiving and being electrically connected to both an actuator switch and a trigger switch, the switches and the spark supply being electrically connected so that to enable firing, the workpiece contact element actuates the actuator switch, which then enables activation of the trigger switch. A unitary actuator has a fixed end, a movable end engageable by movement of the workpiece contact element and a middle portion for engaging the actuator switch upon movement of the movable end caused by depression of the tool against a workpiece.
대표청구항
▼
A combustion-powered tool having a workpiece contacting element movable relative to the tool as the tool is depressed prior to firing includes a spark unit having a high voltage spark supply for providing an ignition spark, a printed circuit board having a first portion configured for receiving and
A combustion-powered tool having a workpiece contacting element movable relative to the tool as the tool is depressed prior to firing includes a spark unit having a high voltage spark supply for providing an ignition spark, a printed circuit board having a first portion configured for receiving and being electrically connected to the high voltage spark supply, and a second portion configured for receiving and being electrically connected to both an actuator switch and a trigger switch, the switches and the spark supply being electrically connected so that to enable firing, the workpiece contact element actuates the actuator switch, which then enables activation of the trigger switch. A unitary actuator has a fixed end, a movable end engageable by movement of the workpiece contact element and a middle portion for engaging the actuator switch upon movement of the movable end caused by depression of the tool against a workpiece. 1. A magnetic recording circuit, comprising: a magnetic write head receiving an input write signal having a first amplitude; and an enhancement circuit increasing a signal strength at the input of said magnetic write head above said first amplitude for a predetermined time interval after every polarity reversal, said predetermined time interval representing a transition period of said magnetic write head, defined as a time period for a current through said magnetic write head to reach a substantially steady state value following said polarity reversal, said increasing of signal strength due to a current ratio in a current mirror circuit. 2. A magnetic recording circuit, comprising: a magnetic write head receiving an input write signal having a first amplitude; a write driver output stage providing said write signal as an output, said write driver output stage including a source-side termination circuit having output impedance ZS; and an interconnect circuit having an input, an output, and a characteristic impedance ZO,said input of said interconnect circuit being coupled to said write signal output of said write driver output stage and said output of said interconnect circuit being coupled to said write signal input of said magnetic write head, wherein Zs=α·ZO,1≤α≤1.3. 3. The magnetic recording circuit of claim 2, wherein 1≤α≤1.3. 4. A method of increasing a data write rate in an inductive recording head by reducing a shortest possible write time interval between adjacent input data signal polarity reversals, said method comprising: interconnecting an inductive recording head to a write driver output stage, using an interconnect circuit having a characteristic impedance ZO,said write driver output stage having an output impedance ZS,wherein ZS=α·ZO,1≤α≤1.3; and enhancing a signal strength at an input of said inductive recording head for a predetermined time interval after every said polarity reversal, said predetermined time interval being a transition period of said magnetic write head, representing a time period for a current through said magnetic write head to reach a substantially steady state value following said polarity reversals. 5. A magnetic recording circuit, comprising: a write driver output stage providing a write signal output with a write signal source strength SO,said write driver output stage including a source-side termination circuit having output impedance ZS; a magnetic write head having a write signal input substantially equal to said strength SO; an enhancement circuit comprising a current mirror; and an interconnect circuit having an input, an output, and a characteristic impedance ZO,said input of said interconnect circuit being coupled to said write signal output of said write driver output stage and said output of said interconnect circuit being coupled to said write signal input of said magnetic write head, wherein said source strength SOof said write driver, at the input of the interconnect circuit, is temporarily increased by said enhancement circuit for a predetermined time duration Δt after every polarity reversal of the write signal. 6. The magnetic recording circuit according to claim 5, wherein said predetermined time duration Δt comprises a time period for a current through said magnetic write head to reach a substantially steady state value for the write current following said polarity reversals. 7. The magnetic recording circuit according to claim 5, wherein said a current mirror causes said increased source strength due to a current ratio of said current mirror. 8. A magnetic recording circuit, comprising: a write driver output stage providing a write signal output with a write signal source strength SO,said write driver output stage including a source-side termination circuit having output
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