[특허]Disk drive with selectable power source for heater in a slider

[미국특허] Disk drive with selectable power source for heater in a slider 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G11B-005/02 G11B-021/02 G11B-015/12
출원번호	US-0903988 (2004-07-30)
발명자 / 주소	Flechsig,Karl Suk,Mike
출원인 / 주소	Hitachi Global Storage Technologies Netherlands B.V.
인용정보	피인용 횟수 : 39 인용 특허 : 5

초록 ▼

A disk drive with switchable power levels for the heaters in the sliders is disclosed. The invention includes a switch for the electrical circuit of each heater which selects between two or more voltages to apply to the power control element and the heater with at least a high and a low voltage option. The heater power control circuit dissipates a certain amount of heat as a part of the control process. By having a low voltage option the disk drive can save power and reduce the amount of heat dissipated by the heater control circuit when high power is not required. The programmable switch is controlled by the drive control system. The high power setting can be used during manufacturing testing or otherwise if higher heater power is needed. The low power setting is used for normal operation or to save power.

대표청구항 ▼

The invention claimed is: 1. A disk drive comprising: a slider with a heater in an electrical circuit; an adjustable power control device in the electrical circuit connected in series with the heater to supply variable power to the heater; at least first and second voltage sources; a programmable switch in the electrical circuit which switchably connects at least a first or second path into the electrical circuit, the first path resulting in a first voltage being applied across the heater and the adjustable power control device in series and the second path resulting in a second voltage being applied across the heater and the adjustable power control device in series and the second voltage being lower than the first voltage; and a control system which controls the programmable switch to apply the first voltage across the heater and the adjustable power control device when high power is needed for the heater and to apply the second voltage across the heater and the adjustable power control device in series when high power is not needed for the heater. 2. The disk drive of claim 1 wherein a positive voltage is supplied to a first side of the heater and the adjustable power control device and the first path connects a negative voltage through the programmable switch and the second path connects a zero voltage through the programmable switch so that the first path results in a total voltage across the heater and the adjustable power control device equal to the positive voltage added to the negative voltage. 3. The disk drive of claim 1 wherein the first path connects a first positive power supply voltage through the programmable switch and the second path connects a second positive voltage through the programmable switch. 4. The disk drive of claim 1 wherein the control system applies the first voltage for high power during manufacturing calibration tests. 5. The disk drive of claim 1 wherein the control system applies the first voltage for high power during tests to cause the slider to contact a disk surface. 6. The disk drive of claim 1 wherein the programmable switch has a connection which cuts off power to the heater. 7. The disk drive of claim 1 wherein the programmable switch is included in an arm electronics chip. 8. A method of operating a disk drive comprising the steps of: programming a switch in a heater control circuit to select a first voltage across an adjustable power control element and a heater in a slider connected in series when high power is needed for the heater, the first voltage resulting from section of a first voltage source in the heater control circuit; and programming the switch in the heater control circuit to select a second voltage across the adjustable power control element and a heater in a slider connected in series when low power is needed for the heater, the second voltage resulting from the inclusion of a second voltage source in the heater control circuit. 9. The method of claim 8 wherein the step of programming the switch in the heater control circuit to select the first voltage further comprises receiving a command from a host computer. 10. The method of claim 9 wherein the command from the host computer is used during manufacturing tests of the disk drive. 11. The method of claim 8 wherein the switch is in an arm electronics chip. 12. The method of claim 8 wherein the switch selects a negative voltage or a zero voltage alternatively. 13. The method of claim 8 wherein the step of programming the switch in the heater control circuit to select the second voltage a second voltage sets a switch in an arm electronics chip to connect a path into the circuit containing the power control element and the heater which applies a zero voltage through the switch. 14. The method of claim 8 wherein the step of programming the switch in the heater control circuit to select the first voltage sets a switch in an arm electronics chip to connect a path into a circuit containing the power control element and the heater which applies a first positive voltage through the switch. 15. The method of claim 8 wherein the step of programming the switch in the heater control circuit to select the second voltage sets a switch in an arm electronics chip to connect a path into the circuit containing the power control element and the heater which applies a second positive voltage through the switch.

이 특허에 인용된 특허 (5) 인용/피인용 타임라인 분석

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이 특허를 인용한 특허 (39) 인용/피인용 타임라인 분석

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Merrow, Brian S.; Truebenbach, Eric L.; Smith, Marc Lesueur, Dependent temperature control within disk drive testing systems.
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Merrow, Brian S.; Garcia, Edward; Polyakov, Evgeny, Disk drive transport, clamping and testing.
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Takahashi,Yasuhiko; Amemiya,Yoshihiro, Heater control method and storage apparatus.
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Merrow, Brian S.; Akers, Larry W., Heating storage devices in a testing system.
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Alex, Michael, Method and apparatus for controlling fly-height of a perpendicular-magnetic-recording head in a hard disk drive.
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Lille, Jeffrey S., Method, system, and computer program product for thermally assisted recording systems.
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Knigge, Bernhard E.; Marchon, Bruno, Negative biasing a slider with respect to a disk to reduce slider wear and provide burnish rate control.
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Yokota, Toshiyuki; Nagasaka, Yoshiyuki, Storage device and storage device controller including feature for causing thermal protrusion phenomenon in the head during startup period of device.
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Merrow, Brian S.; Akers, Larry W., Storage device testing system with a conductive heating assembly.
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Polyakov, Evgeny; Garcia, Edward; Truebenbach, Eric L.; Merrow, Brian S.; Whitaker, Brian J., Transferring disk drives within disk drive testing systems.
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[미국특허] Disk drive with selectable power source for heater in a slider 원문보기

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[미국특허] Disk drive with selectable power source for heater in a slider 원문보기

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이 특허에 인용된 특허 (5) 인용/피인용 타임라인 분석

이 특허를 인용한 특허 (39) 인용/피인용 타임라인 분석

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