JPS62298059A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce the power consumption by inhibiting a moving command of a carriage, when a magnetic disk is not inserted, by the output of a disk sensor for detecting the insertion of the magnetic disk. CONSTITUTION:When the magnetic disk is not inserted, an output; the inverse of CIN is generated from a disk sensor. When the output of an OR gate 9 becomes an H H level, a power source to a driving motor 2 for a medium rotation various sensors 3, and a read/write circuit 4 is turned off through a drive 11 and a transistor 7. Simultaneously, by inverter 8 and a gate circuit 6, the excitation phase of an SPM is all turned off, by leaving a part of a driving step-motor SPM control circuit 1, and the device becomes a stand-by mode. Also, by using an OR gate 10, it is inhibited that the negative pulse of a step signal the inverse of STEP is led into the circuit 1. Accordingly, a carriage mobile operation by a motor-on signal, the inverse of MON for a medium rotation from a host device is inhibited, and the power consumption is decreased.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic storage bag such as a fluffy disk using a 6n air disk.

[Conventional technology]

In the past, the carriage moving operation (hereinafter referred to as "seeking operation") was not limited by the state of the n-air disk 'AM, and the seek operation was performed in response to a seek command from a host device.

[Problem that the invention seeks to solve]

However, as magnetic disk drives have become smaller and thinner, problems have arisen if they constantly accept seek operations. Furthermore, problems have also arisen due to lower power consumption of magnetic disk drives. FIG. 5 is a general sectional view showing the positional relationship between a magnetic head and a carriage of a magnetic disk device.

40 is a case that also serves as a shield, 41 is an upper carriage,
42 is an upper head, 43 is a lower head, 44 is a lower carriage, and 45 is a means for raising and lowering the upper carriage.

Figure 5+a shows the state when no magnetic disk is inserted.
+, Fig. 5 ('b) shows the state in which the magnetic disk is inserted. When the magnetic disk is not inserted, the upper carriage is forcibly lifted by 45, but the gap margin is reduced due to the thinner structure. , upper carriage 41 and case 4
It is also assumed that 0's may collide. It is impossible to seek in a state of collision, and seek errors and component damage are possible. Furthermore, regarding the relationship between 45 and 41, if a magnetic disk is inserted, they will not be in contact, but if a magnetic disk is not inserted, the carriage will move with large friction while in contact, resulting in a large position error. will occur. In particular, recently, power consumption during operation has been further reduced by using a lead screw as a carriage moving means and turning off the power to the motor except during seek, so position errors are more likely to occur when the motor is not energized.

[Means for solving problems]

In order to solve the problems caused by the seek operation when no magnetic disk is inserted as described above, the present invention prohibits the seek command from the upper bag r when no magnetic disk is present. In particular, since magnetic disk drives are often in standby mode when the medium is not rotating, seek commands are prohibited in standby mode. The standby mode occurs when a rotation command from a host device turns the motor off or when a magnetic disk is not present even if the rotation command turns on the motor. Furthermore, the disk sensor may detect that no magnetic disk is inserted and prohibit the seek command.In either case, the software of the host device that performs the seek operation when no magnetic disk is present has the following exceptions. It seems that there is no such problem, and it can be solved by the method of the present invention. An exception to the above is software that performs a seek operation to the outermost circumference in order to know the connection state of the magnetic disk device when the system is powered on, and detects that the magnetic disk device is connected if a 00 output is present.

This case can be realized by first outputting the OO ratio output and then adding a means to automatically seek the 00 track by inserting the magnetic disk.

[For production]

With the above configuration of the present invention, seek operations can be prohibited when no magnetic disk is inserted without impairing the functionality and reliability of the magnetic disk device.

〔Example〕

The following is a detailed explanation of the present invention based on the drawings.
The figure is a control circuit diagram of the carriage moving means of the magnetic disk device of the present invention. 1 is a step motor for driving (SP
M) Control circuit, 2 is a drive motor (DM) for rotating the medium
, 3 are various sensors, and 4 is an analog circuit for read/write. 5 is a disk sensor which becomes conductive when a magnetic disk is inserted and generates an output C lower N. ■ON is a motor-on signal for rotating the medium from the host device, 5TEP is a step signal that generates a negative pulse every time it moves, and D
IR is a signal that is synchronized with 5TEP and indicates the direction of movement toward the inner circumference at L level. In FIG. 1, standby mode is configured by OR gate 9, and when the output of 9 becomes H, 2.3
．． At the same time, the inverter 8 and the gate circuit 6 turn off all the excitation phases of the SPM, leaving only a part of the control circuit in standby mode. The remaining control circuit has a CMO3 configuration, and the magnetic disk drive requires only a small amount of power in standby mode.Here, using OR gate 10, when the output of 9 is H, a negative pulse signal of 5TEP is introduced to 1. prohibited.

FIG. 2 is a control circuit diagram of a carriage moving means according to another embodiment of the present invention. 1 to 8 are the same as in FIG. 1, and 5TEP is inhibited by the OR gate 12 which causes the signal CIN to become H when no magnetic disk is inserted. 2 to 4 are configured so that the power is turned off during standby mode by the OR gate 13, but 3 and 4 are always i1? ii.
The rotation of DM 2 is controlled only by a signal to σ, and it is also possible to eliminate DM 6 and connect φ1 to φ4 directly. In this case, the magnetic disk device does not have a standby mode.

FIG. 3 is a control circuit diagram of a carriage moving means according to still another embodiment of the present invention.

The 5TEP signal input when CIN is at H level is prohibited from being input to 1 by the gate 14, but at this time, the stone output of the flip-flop (FF) is inverted to H level. Then, the output of the AND gate 27 also becomes H, and a pulse with a constant time width is output from the monomulti 28, and the output from the gate 29.
The output of track 00 to the host device through 30 generates a clove, and by making the clove respond with a seek command, the operation equivalent to that of a magnetic disk device being connected is performed.The pulse width of 28 is several tens of milliseconds. It's good to have.

Also, when a magnetic disk is inserted, inverter 2
0, even if it is not inserted, if it is already in the 00 trunk, the TKOO signal is set to 22 through the gate 21, so that 22 is not inverted.0 When the magnetic disk is inserted next, the TKOO signal is sent to the FF24 through the gate 23. The data input is set to H, and an output X is generated from a differential circuit consisting of 24, 25, 26 using an internal clock CLOCK1 of about 100 kHz. X returns 22 to the initial state, and also activates the cent reset OFF consisting of the gate I8.19, so that the signal Y becomes 11. When Y becomes H, the internal clock (CLOCK2) with a period of several ms, which is equivalent to the step rate, opens the gate 31 and is guided to the input Z of the SPM control circuit through the gate 15. Furthermore, the signal Y is passed through the gate 16 in the theta direction. is forcibly held in the outer circumferential direction, and the above operation causes a forced seek operation in the outer circumferential direction. The above operation continues until the signal Y becomes L. At Y, a signal TKOO is generated, and the set/reset FF is inverted manually at 19. The signal AC input to 19 is a clear signal when the power is turned on and determines the initial state. 0 As mentioned above, in the configuration of FIG. 3 of the present invention, seek operation is prohibited when no magnetic disk is inserted. 00 output can be generated regardless of the track position. After the magnetic disk is inserted,
You can immediately seek to track 00 and get the information about the track position. Trunk information is basically meaningless because it cannot operate when no magnetic disk is inserted. Furthermore, since there is a delay in the rotation start time of the medium after the magnetic disk is inserted, the forced seek operation can be sufficiently completed during this time.

FIG. 4 is a timing chart showing the operation of FIG. 3. T1 is generated by the input 5TEP when the go tile is H, and when the T tile becomes L, the signals X, Y, Z, TY are sequentially generated.
This shows the process by which OO changes.

〔Effect of the invention〕

As described in detail above, seek operations input in standby mode or while a magnetic disk is not inserted can be prohibited without any problem, which has a great effect on making the magnetic disk device thinner and more compact.

Furthermore, since the seek operation is performed only when the magnetic disk is inserted normally, there is no possibility of deterioration of positional accuracy due to frictional load, and it is possible to lower the power during seek or stop energizing the step motor except for the seek operation. So, when seeking,
Power consumption during read/write can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram of a carriage moving means according to an embodiment of the present invention. 2 and 3 are circuit diagrams for controlling a carriage moving means according to another embodiment of the present invention, and FIG. 4 is a timing chart showing the operation of FIG. 3. Figure 5 ta+ (bl) is a general sectional view showing the positional relationship between the magnetic head and carriage of a magnetic disk device. 1... SPM control circuit 2... Drive motor 3. ... Sensors 4 ... Read/write circuit 5 ... Media sensor 40 ... Case 41 that also serves as a shield ...
...Upper carriage 42.43 Magnetic head 45... Upper carriage means plate Upper applicant Seiko Epson Corporation Figure 1 Figure 2 Figure 4 Figure 5 ((1) Figure 5 Cb)

Claims (3)

[Claims] (1) Consisting of a rotational drive means for rotating a magnetic disk medium, a magnetic head for reading and writing, a carriage on which the magnetic head is mounted, a carriage moving means for moving the carriage, and a disk sensor for detecting insertion of a magnetic disk. A magnetic disk device characterized in that a movement command of a carriage moving means is prohibited when a magnetic disk is not inserted according to an output of the disk sensor. (2) A magnetic field consisting of a rotation drive means for rotating a magnetic disk medium, a magnetic head for reading and writing, a carriage on which the magnetic head is mounted, a carriage moving means for moving the carriage, and a disk sensor for detecting the insertion of a magnetic disk. In the disk device, the rotary moving means is prohibited from rotating when no magnetic disk is inserted according to the output of a disk sensor, and when the rotation is stopped, a movement command to the carriage moving means is prohibited. A magnetic disk device according to item 1. (3) Generates a track 00 output signal indicating the outermost position of the carriage by the movement command input when the movement command to the carriage movement means is prohibited, and then moves to the track 00 position based on the insertion of a magnetic disk. The magnetic disk device according to claim 1, characterized in that the carriage is forcibly returned.