JPS60103553A - Magnetic disc driver - Google Patents

Abstract

PURPOSE:To decrease power consumption by supplying power to a sensor drive circuit via a switch from a power supply only when a sensor drive circuit is to be driven. CONSTITUTION:When a switch 5 is closed by a control signal from a control circuit 4, a power is fed from a power supply 3 to a light emitting diode 6, and light 10 is ejected from the light emitting diode 6. When the irradiated light 10 is made incident to a photo transistor (TR) 7, a current flows from the TR7 and a voltage signal at that time is fed to the control circuit 4 via an inverter 9. In using a PNP TR11 for the switch 5, the switching operation is attained with very simple constitution and also at a low current. When no detection signal from the photo TR7 is required, for example, when the arithmetic operation continues for a long time at the CPU main body of the host side and the interval of access to a magnetic disc is long, the power the supply from the power supply 3 to the light emitting diode 6 is interrupted by turning off the switch 5 to prevent waste of power.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a recording disk drive device such as a floppy disk device, and more specifically, to a method for detecting the state of a recording medium used in such a recording disk drive device. The present invention relates to a state detection method.

Wind Speed n A recording disk device such as a floppy disk device is provided with a detection device that detects the state of a recording medium used for recording. For example, the state of the floppy disk being used is detected by detecting the index hole of the floppy disk or the write inhibit notch on the jacket. Conventionally, when power is supplied from the power supply by the main switch, power is also supplied to a control circuit that controls reading/writing of the recording medium and a sensor drive circuit of a detection system that detects the state of the recording medium, etc. The circuit was kept in constant operation.

The sensor drive circuit or state detection device 1 shown in FIG. 1 each includes a light emitting diode LED and a phototransistor PH.
Four pairs of detection units 1a to 1d configured in combination with TO are connected to a power source 3 via connectors 2, respectively. For example, a light emitting diode TPOOLED and a phototransistor TR0OPH for detecting the track OO
Light emitting diodes WR, PROTLED and phototransistors WR,', PRO, , T PHTo are combined for detecting write protection. In addition, a light emitting diode INDEX LED and a phototransistor IN'DEX, P)-ITO and □ are combined for detecting the index, and a light emitting diode MEDIA L for the media switch is combined.
An ED and a phototransistor MEDIA PHTO are combined.

These light emitting diodes constantly emit light by power supplied from the N source 3.

The N current supplied to one light emitting diode is typically 15 mA or more. Therefore, when four light emitting diodes are provided as described above, the power supplied to the entire light emitting diodes is 15X10-3(A)X5(V)X4
(number) = 0.3 (W).

On the other hand, the power used for the entire normal recording disk device is 5.
If it is about W, the ratio of the power consumption of the light emitting diode to the power consumption of the entire device is as much as 6%. Therefore, regardless of whether or not it is necessary to turn on the light emitting diode for detecting the state of the recording medium, the light emitting diode does not turn on during the period from when power is turned on to the recording disk device until it is turned off. If it remains connected to N3, significant power will be wasted.

Purpose The present invention has been made in view of the above points, and it is an object of the present invention to provide a recording disk drive device that can reduce power consumption.

-1 Hereinafter, the specific implementation of the present invention will be explained! 1!11 will be explained in detail with reference to the attached drawings. In the present embodiment shown in FIG. 2, a switch 5 is provided between the sensor section 1 and the power source 3, and this switch 5 is operated under the control of the control circuit 4 depending on the operating state of the recording disk device. Controlled on/off. By controlling the opening and closing of this switch 5, power supply from the power source 3 to the sensor section 1 is controlled.

FIG. 3 shows a specific embodiment in which the present invention is applied to a floppy disk device. In the illustrated floppy disk device, a floppy disk 21 made of a flexible magnetic recording medium is housed in a jacket 20, and is loaded into the floppy disk device through an insertion slot (not shown). By closing a door (not shown), the floppy disk 21 is positioned at a predetermined position and held in a rotatable state. In the apparatus of this example, a floppy disk drive motor 22 is arranged laterally alongside the floppy disk 21, and drives and rotates the floppy disk 21 via a coupling mechanism (not shown). motor 2
A head actuator 23 is disposed above the head actuator 23, and the arm 2 can move forward and backward from the head actuator 23.
3a extends, and a head (not shown) for self-transporting and reading information is attached to the tip of the arm 23a. Further, the head actuator 23 is provided with a head loading mechanism 23b, which controls loading or unloading of the head to control the state of contact with the floppy disk 21.

The control circuit 24 controls the drive of the floppy disk, and is connected to a computer or microprocessor on the host side via a bus (not shown), and receives various signals 2.
40 and performs the interface function. The control circuit 24 can also be configured with a one-chip floppy disk controller, for example. Control circuit 24
is connected to the head actuator 23 via a signal line 24a, and the arm 23a is connected to the floppy disk 21.
The head is positioned on a desired track by moving the head in the radial direction of the head. The control circuit 24 is also connected to the head loading mechanism 23b via a signal line 24b, and controls loading and unloading of the head based on signals from the control circuit 24. The control circuit 24 is connected to the light circuit 25, and receives a signal 1125a from the light circuit 25.
is connected to a head (not shown) at the tip of the arm 23a. Therefore, the write data supplied under the command of the microprocessor on the host side is supplied to the head via the signal line 25a, and information is written to the floppy disk 21. Similarly, the read circuit 2 is connected to the write circuit 25.
A signal FJ26a extending from the read circuit 26 is also connected to the head, and information recorded on the floppy disk 21 is read out. Note that it is also possible to configure the write circuit 25 and the read circuit 26 integrally within the control circuit 24.

As mentioned above, the detection system or sensor section 1A-1a, I for detecting the state of the floppy disk 21, the head position, etc.
B-1b, IC-1c, and ID-1d are provided, and each sensor section is configured to be connectable to a power source 3 via a switch 5. 6 points of sensor section 5KIA to 1D
is composed of light-emitting elements such as light-emitting diodes, and each element 1a to 1d is composed of light-receiving elements such as phototransistors or photodiodes capable of receiving light from the respective light-emitting diodes. A detection system is formed to detect whether the light emitting diode 1A and the phototransistor disk are inserted, and in this example, a part of the jacket 20 blocks the optical path between the light emitting diode 1A and the phototransistor 1a. By doing so, it is detected that the Fronby disk 21 is inserted. The set of light emitting diode 1B and phototransistor 11) is for detecting a write protection notch, and detects the presence or absence of a write protection notch 20a carved in the jacket 20, as shown.

The light emitting diode 1C and the phototransistor 1C are connected to an index hole 21 formed in a floppy disk 21.
This is for detecting the index hole 21a while the floppy disk 21 is rotating and sends a signal to the control circuit.

The remaining pair of light emitting diode 1D and phototransistor 1d is for detecting the track OO, and the arm 213 is moved to the retracted position by the actuator 23, and its read/write head is positioned at track 00 (usually the outermost track) of the floppy disk 21. to detect that

Light emitting diodes 1A to 1D and phototransistor 1a
The phototransistors 1a to 1d can each be connected to the power supply 3 via the switch 5, and the phototransistors 1a to 1d are connected to the control circuit 24 via their respective signal lines, and the switch 5 is also connected to the control circuit 24. . Therefore, the switch 5 is controlled on/off by a signal from the control circuit 24 to control the connection state between the light emitting diodes 1A to 1D and the phototransistors 1a to 1d and the power source 3. With this configuration, it is possible to open and open the switch 5 according to the state of the switch-on signal supplied to the control circuit 24 from the host side, so the switch 5 can be closed only when necessary and the detection system can be turned on and off. When power is supplied to the detection system 1 and other signals from the detection system 1 are not required, the state of the switch-on signal from the host side is changed to open the switch 5, and the detection system 1
It is possible to cut off the power supply to 'a'. To give one example, floppy disk drives similar to Raft numbers are connected to the same microprocessor in a daisy-chain or star connection, and are simultaneously switched when the drive is not selected or when the motor is turned off. 5 to 1
In other words, the microprocessor on the host side performs calculations for a preset period of time, and the floppy disk
It is conceivable to open the switch 5 when the star is not accessed.

In the embodiment shown in FIG. 4, the sensor section 1 includes a light emitting diode 6, a phototransistor 7, a resistor 8. It is composed of an inverter 9. A light emitting diode 6 that consumes power to emit light is connected to a switch 5 via a resistor 8. The phototransistor 7 is connected to the switch 5 via a resistor 8 and to the control circuit 4 via an inverter 9. When the switch 5 is closed by the control signal from the control circuit 4, current is supplied from the power source 3 to the light emitting diode 6, and the light 1 is emitted from the light emitting diode 6.
0 is ejected. When the emitted light 10 enters the phototransistor 7, a current flows through the phototransistor 7, and the voltage signal at that time is sent to the control circuit 4 via the inverter 9.

If a PNPt transistor 11 as shown in FIG. 5 is used as an example of a switching element used in the switch 5, it is possible to perform a switching operation with a very simple structure and with a low current.

The switch 5 is opened and closed in response to a control signal from the control circuit 4, and this control signal is a signal that turns the switch 5 into the Un state when there is no need to drive the light emitting diode 6 and phototransistor 7. That is, in the recording disk drive device, when the detection signal from the phototransistor 7 is not required, for example, when the CPU main body on the host side continues to perform calculations for a long time and the interval between accesses to the magnetic disk is long, the switch 5 is is turned off to cut off the power supply from the power source 3 to the light emitting diode 6, thereby preventing wastage of power. The opening/closing timing of this switch 5 may be synchronized with the intermittent drive timing of a spindle motor (not shown) in the apparatus. Intermittent drive control of the spindle motor is performed in the absence of a head loading mechanism to avoid media wear and drive with low power. Furthermore, if a μm CPU is used to control the opening/closing timing of the switch 5, the control can be easily performed.

In this way, since power is supplied to the sensor drive circuit 1 from the power supply 3 via the switch 6 only when it is necessary to drive the sensor drive circuit 1, the sensor drive circuit 1 can be driven with the minimum amount of power. is possible. Further, when the present invention is applied to a disk drive device using a storage battery as a power source, the life of the storage battery can be extended.

Effects As detailed above, according to the present invention, it is possible to reduce the power consumption of a disk drive device, and to supply power only when necessary to the detection system that detects the state of the recording medium. Since power consumption can be controlled in various ways, it is possible to optimize power consumption. Further, the present invention is applicable to a battery-driven device that needs to be driven with low power consumption, and is also applicable to a device that performs complex control with low power consumption using a μm CPU.

It should be noted that the present invention should not be limited to the specific embodiments described above, and it goes without saying that various modifications can be made within the technical scope of the present invention.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a sensor drive circuit having a d configuration for detecting the state of a recording medium by a combination of a light emitting diode and a phototransistor, and FIG. 3 is a schematic diagram showing the implementation of the present invention when applied to a floppy disk device, FIG. 4 is a circuit diagram showing another embodiment of the present invention, and FIG. 5 is a specific example of the switch 5. (Explanation of symbols) 1: Sensor drive circuit 3: Power supply 4: Control circuit 5: Switch 6: Light emitting diode 7: Phototransistor 11: PNP transistor

Claims (1)

[Claims] 1. In a recording disk drive device that drives and rotates a recording disk and moves a head to a desired position on the disk to write/read information, a detection system that detects a predetermined state; It has a switch interposed between the device and the power source, and a control circuit connected to the switch and controlling the operation of each component of the device,
A recording disk drive device characterized in that opening and closing of the switch is controlled by a control signal from the control circuit.