JPS63313389A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To stably start up the titled device even under a low environmental temperature by providing a heating means and a timing means for starting/ stopping a heat generation driving in the vicinity of an integrated circuit incorporating write/read circuit and a starting means for said timing means. CONSTITUTION:A startup circuit output signal 11 has a pulse 14 generated from a startup circuit 2 at the time of applying an electric current to the titled magnetic disk device, and a timing circuit 3 generates a pulse 15 having the width of time T in a timing circuit output signal 12 while synchronizing with the leading edge of this pulse 14. An electric current source 4 supplies a current of a current value 1 to a resistor 1 for a time T while the timing circuit output signal 12 is at a high level, whereas the resistor 1 is heated up by the current 1 to warm up an integrated circuit case 6 and the write/read integrated circuit 5. By this method, when the magnetic disk device is operatable, the temperature of the write/read integrated circuit 5 is raised up, thus ensuring easily the stable operation.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic disk device, and in particular, a magnetic head and a magnetic disk are housed in a dust-proof structure, and an integrated circuit for writing and reading the magnetic head is located near the magnetic head. The present invention relates to a magnetic disk device installed in

[Conventional technology]

In conventional magnetic disk drives of this type, the write/read circuit reduces transmission loss of read signals from the magnetic head, improves noise resistance, and speeds up switching of recording current to the magnetic head. In order to do this, it is placed near the magnetic head. For this reason, the above-mentioned read/write circuit is integrated into an integrated circuit to make it smaller and lighter. ! located within the structure.

Since this integrated circuit supplies high-speed switching recording direct current to the magnetic head, it generates a considerable amount of heat, and the normal chip temperature is quite high. However, when a magnetic disk drive is started up, the chip temperature is the ambient temperature, and if the chip is installed in a normal office in a cold region, it may be below the OC.

It is quite difficult to operate integrated circuits with high speed and high frequency bands stably over such a wide temperature range, and
There was a drawback that the operation at startup of C or lower might become unstable.

[Problem that the invention seeks to solve]

The problem to be solved by the present invention is to eliminate the above-mentioned drawbacks of magnetic disk drives and to provide a highly reliable magnetic disk drive that can stably start up even at low environmental temperatures.

[Means for solving problems]

A magnetic disk device of the present invention includes an integrated circuit case housing an integrated circuit incorporating a write/read circuit for performing write/readout of a magnetic head, and a heat generating means disposed close to the integration port; a driving means for generating;
The driving device includes a timer for starting the drive means and stopping it after a predetermined time, and a starting means for starting the timer.

[Implementation row]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

Referring to FIG. 1, in this embodiment, a resistor 1 serving as a heat generating means is placed in close proximity to the write/read integrated circuit 5 in an integrated circuit case 6 accommodating a write/read integrated circuit 5 that performs writing/reading of a magnetic head. a current source 4 that supplies current to the resistor 1 and generates heat in the resistor 1, with both ends of the resistor 1 connected to two output terminals, and an output signal line connected to the input terminal of the current source 4. The timer circuit 3 is connected to the timer circuit 3, and the timer circuit 3
The starting circuit 2 has an output signal line connected to an input terminal of the starting circuit 2.

FIG. 2 is a perspective view showing the state in which the resistor 1 is mounted inside the integrated circuit case 6, and the top cover of the integrated circuit case 6 is removed so that the interior can be seen. In FIG. 2, resistor 1 is mounted within integrated circuit case 6 and in close proximity to write/read integrated circuit 5. In FIG. The output terminal of the resistor 1 is connected to a lead 9 via a bonging wire 10. Therefore, the temperature of the resistor l and the temperature of the writing cell integrated circuit are approximately equal.

Next, the operation of this embodiment will be explained.

FIG. 3 is a waveform diagram of the main points in FIG. 1.

Referring to FIG. 3, the starting circuit output signal 11 includes a pulse 14 generated by the starting circuit 2 when current is applied to the magnetic disk drive, and in synchronization with the rise of this pulse 14, the time limit circuit 3 outputs the pulse 14. A pulse 15 having a width of time T is generated in a certain time limit circuit output signal 12. The current source 4 causes a current of a value to flow through the resistor 1 during the time T when the time limit circuit output signal 12 is at a high level.The resistor 1 generates heat due to the current value t*, and the integrated circuit case 6 and Readout integrated circuit 5
warm up. Time T is the startup time of the magnetic disk drive (time from power on to ready for operation), and the current value is the power loss I! caused by the resistance of resistor 1! It is determined by the temperature rise caused by 几. That is, assuming that the thermal resistance of the integrated circuit case 6 is 0, the temperature rise ΔT of the integrated circuit case 6 is.

It is determined by ΔT=θ×I snow B. This temperature increase also applies to the write/read integrated circuit 5. Integrated circuit case 6
If the thermal time constant of is smaller than the time T, the above-mentioned ΔT is the temperature rise of the write/read integrated circuit 5. If the above-mentioned thermal time constant is larger than the time T, in order to obtain the desired temperature rise, the above-mentioned Δ
It is necessary to flow a current larger than the current value I obtained from T==θx 8 liters.

As described above, when the magnetic disk drive is ready for operation, the temperature of the write/read integrated circuit 5 is rising, and the operating environment temperature range is compressed, making it easier to maintain stable operation.

〔Effect of the invention〕

As described above, by using the magnetic disk drive of the present invention, the writing/reading integrated circuit is warmed by the heating means disposed close to the writing/reading integrated circuit, and the operating environment temperature range thereof is compressed. Therefore, even in a low-temperature environment such as an office in a cold region, a stable pouring operation can be guaranteed even immediately after startup, and a highly reliable magnetic disk drive can therefore be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, Tu 2
The figure is a perspective view showing an example of the integrated circuit case in Figure 1, and Figure 3 is a perspective view showing an example of the integrated circuit case in Figure 1.
The figure is a waveform diagram of the main lfr in FIG. 1...Resistor, 2...Start circuit, 3.
...Timed circuit, 4...Current source, 5...
...Moss-filled integrated circuit, 6...Integrated circuit case, 9...Lead, 10...Bonding wire. 2", Kaya lI!r $ 3 times

Claims (1)

[Claims] An integrated circuit case housing an integrated circuit including a read/write circuit for writing/reading a magnetic head, a heat generating means provided in close proximity to the integrated circuit, a driving means for causing the heat generating means to generate heat, and a driving means for causing the heating means to generate heat. 1. A magnetic storage device comprising: a timer for driving the device for a predetermined time; and a starter for activating the timer.