JPH05166241A - Recorder - Google Patents

Abstract

PURPOSE:To perform the NCSS operation of a flying head by providing a pressing mechanism against a lifter mechanism and the flying head without increasing the device in weight and size, preventing high speed seek performance from deteriorating even when the lifter mechanism is provided and utilizing a focus servo mechanism of an objective lens provided as in the conventional manner. CONSTITUTION:At the time of shifting into a pull-in state, a focus coil 23 is supplied with a driving current Ia and an objective lens 21 is moved upward, while the lifter mechanism 17 and the flying head 26, etc., are also moved. Meanwhile, the flying head 26 is pressed by the objective lens 21 to float up stably. On the other hand, at the time of shifting into a standby state, the objective lens 21 is moved downward, and at the same time, the lifter mechanism 17 and the flying head 26 are also moved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus, and more particularly to a recording apparatus of a magnetic field modulation recording type using a negative pressure type flying head, a so-called negative pressure slider.

[0002]

2. Description of the Related Art As a magnetic field modulation recording system, an overwrite system has been proposed in which a magnetic field is applied using a flying head.

When a flying head is used, similar to the hard disk, there are problems regarding contact start stop (hereinafter referred to as CSS) and non-contact start stop (hereinafter referred to as NCSS). Therefore, the flying head in the magnetic field modulation recording method is preferably NCSS and the negative pressure slider method is preferable.

When the NCSS and the negative pressure slider system are adopted, a mechanism for applying a predetermined pressure is required in order to pull in the flying head and stably float after the disk is started. In addition, a lifter mechanism is required to improve impact resistance or prevent impact.

[0005]

The provision of the above-mentioned pressure applying mechanism and / or lifter mechanism in the recording apparatus has a problem that the reduction in size, weight and thickness of the apparatus is hindered. .. Further, when incorporating a lifter mechanism having a motor as a drive source, there is a problem that the feed portion becomes heavy and the high-speed seek performance deteriorates.

Therefore, an object of the present invention is to use a focus servo mechanism for an objective lens, which has been conventionally provided, as a drive source.
Another object is to provide a recording device that performs a CSS operation.

[0007]

According to the present invention, in a recording apparatus for recording on a recording medium by using a negative pressure type flying head, the flying head and the objective lens are both biased toward the recording medium side. When the objective lens moves away from the recording medium in the standby state, the moving means moves the flying head in the direction away from the recording medium, and the objective lens records when the focus is pulled in. When moved in the direction of approaching the medium, the moving head causes the flying head to approach the recording medium, and a predetermined pressure is applied to the flying head so that the flying head is stably floated.

[0008]

When the standby state is shifted to the focus pull-in state, the objective lens is moved by the focus servo mechanism in the direction of approaching the recording medium. The flying head adapted to move in the same direction via the moving means also approaches the recording medium in response to the movement of the objective lens. Then, when a predetermined pressure is applied to the flying head, the flying head is stably floated while maintaining a predetermined flying height.

On the other hand, when shifting from the focus pull-in state to the standby state, the objective lens moves in the direction away from the recording medium by the focus servo mechanism. The flying head configured to move in the same direction via the moving means also moves in a direction away from the recording medium in response to the movement of the objective lens. Then, it shifts to the standby state.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In this embodiment, a recording / reproducing apparatus of a magnetic field modulation recording method using a negative pressure type flying head, that is, a so-called negative pressure slider is described as an example. A magneto-optical disk recording / reproducing apparatus to which the present invention is applied will be described below.

In the configuration of FIG. 1, in the modulation circuit 2, when a recording mode, for example, a format mode for forming pits (not shown) for servo on the magneto-optical disk 5 is designated, the signal is supplied through the terminal 1. A drive control signal DCO for driving the laser diode 4 provided in the optical pickup and the magnetic field generator 3 at the recording level is formed when the recording data DT to be recorded is subjected to predetermined modulation. .. The drive control signal DCO is supplied to the laser diode 4 described above.

In the modulation circuit 2, the drive control signal DC1 for driving the laser diode 4 at the reproduction level is formed under the control of the CPU 6 in the reproduction mode. The drive control signal DC1 is supplied to the laser diode 4 described above.

In the laser diode 4, the drive control signal D
It is controlled based on CO and DC1 and outputs a laser beam of a level corresponding to each mode.

The laser light output from the laser diode 4 is applied to the surface 5a of the magneto-optical disk 5 to form a beam spot BS0. This provides the necessary recording and / or the reflected light required for reproduction. The laser light reflected from the surface 5 a of the magneto-optical disk 5 is supplied to the optical pickup and the magnetic field generator 3.

In the optical pickup and magnetic field generator 3,
The reflected laser light is converted into an RF signal SRF by the detector 7. The reproduced RF signal SRF is supplied to the tracking error detection circuit 8 and the RF signal level detection circuit 10 via the amplifier 9.

The optical pickup and magnetic field generator 3
Drive current Ia used in the focus servo mechanism of
Are supplied to the detection circuit 35. Further, a signal from a detection unit 51, which will be described later and is provided in the optical pickup and magnetic field generation unit 3, is supplied to the CPU 6.

In the tracking error detection circuit 8, the RF
The tracking error signal STER is extracted from the signal SRF, and the tracking error signal STER is output to the servo circuit 12.
Is supplied to.

In the servo circuit 12, a servo signal SSB for driving and controlling an actuator (not shown) is formed based on the above tracking error signal STER or a control signal SPM described later. The servo signal S
SB is supplied to an actuator (not shown), the CPU 6, and the like. A focus drive circuit 22, which will be described later, is incorporated in the servo circuit 12, and the servo signal SSB includes the drive current Ia and the like.

In the actuator, the above-mentioned servo signal S
Based on SB, necessary servo control such as focus servo, tracking servo, and threader servo of the optical pickup and the magnetic field generator 3 is performed.

The RF signal level detection circuit 10 detects the level of the RF signal SRF. The level of the RF signal SRF is supplied to the CPU 6.

In the detection circuit 35, the drive current Ia supplied from the optical pickup and magnetic field generator 3 is converted into a voltage and supplied to the A / D conversion circuit 39. In the A / D conversion circuit 39, the above voltage is converted into digital data and supplied to the CPU 6.

In the CPU 6, the modulation circuit 2 is based on the level of the RF signal SRF supplied from the RF signal detection circuit 10.
Drive control of the laser diode 4 is performed via.

The CPU 6 determines whether or not the focus servo for the objective lens 21 is appropriate based on the digital data supplied from the A / D conversion circuit 39 and the signal supplied from the detection unit 51 described later. .. CPU6
Then, a control signal SPM for performing not only the focus servo but also various servo controls is formed. The control signal SPM
Are supplied to the servo circuit 12. The CPU 6 controls the timing based on a clock signal CK supplied from a PLL circuit 14 described later.

On the other hand, the motor 32 for rotating the magneto-optical disk 5 is provided with the FG pulse generator 13.
In the FG pulse generator 13, an FG pulse is formed according to the rotation speed of the motor 32. The FG pulse is supplied to the PLL circuit 14.

The PLL circuit 14 extracts a clock component from the FG pulse, and forms a clock signal CK based on the clock component. The clock signal CK is supplied to the CPU 6.

FIG. 2 shows the structure of the main part of the invention including the optical pickup and the magnetic field generator 3. The configuration and operation of the main part of the invention including the optical pickup and the magnetic field generator 3 will be described below with reference to FIG.

As shown in FIG. 2, the optical pickup and magnetic field generator 3 includes an optical pickup 16, a flying head 26 as magnetic field generating means, and a lifter mechanism 1.
It is mainly composed of 7 and 7.

Inside the optical pickup 16, an objective lens 21 and a focus coil 23 as an actuator for performing focus control of the objective lens 21 are provided. Note that the description of the other configuration of the optical pickup 16 is omitted.

The flying head 26 has a generally plate-like shape as shown in FIG.
5 is formed. In the approximate center of the recess 45,
A winding portion 46 for forming a magnetic field is formed by the protruding portion 48 and the winding wire 49 wound around the protruding portion 48. In the center of the convex portion 48, holes 47 for passing the laser light are radially formed in the direction opposite to the arrow A direction.

The lifter mechanism 17 includes a flying head 26.
A gimbal 25 that moves the gimbal 25 up and down in the arrow A direction and the arrow A opposite direction, and a lifter gimbal 27 that moves the gimbal 25 in response to the vertical movement of the objective lens 21 in the arrow A direction and the arrow A opposite direction. , A support member 24 that supports the gimbal 25 and the lifter gimbal 27.

The lifter gimbal 27 is made of a material having a spring property, and the lifter gimbal 27 is provided.
Are urged upward (in the direction of arrow A in FIG. 2).
The gimbal 25 is fixed to the lifter gimbal 27.

In the configuration of FIG. 2, the FG pulse generator 13 provided in the motor 32 forms an FG pulse according to the rotation speed of the motor 32. The clock signal CK is formed in the PLL circuit 14 based on the FG pulse. The clock signal CK is supplied to the CPU 6.

In the CPU 6, the rotation speed (rpm) of the motor 32 is based on the clock signal CK supplied from the PLL circuit 14.
When it is detected that has reached a specified level, a focus pull-in signal is formed. The focus pull-in signal is supplied to the focus drive circuit 22.

In the focus drive circuit 22, the CPU
When the focus pull-in signal is supplied from 6, the drive current Ia is supplied to the focus coil 23 provided in the biaxial actuator of the optical pickup 16. When the drive current Ia is supplied, the objective coil 21 is moved by the focus coil 23 in the up-down direction (direction A shown in FIG. 2 or direction A opposite to arrow A).

When the objective lens 21 moves upward, the flying head 26 is pressed by the objective lens 21 toward the magneto-optical disk 5 side with a predetermined pressure. Then, the flying head 26 is placed in a state of being fixed to the magneto-optical disk 5 with a predetermined distance by negative pressure [hereinafter referred to as a flying state].

When the objective lens 21 moves downward, the flying head 26 moves downward. Details of the movement of the objective lens 21 and the movements of the lifter gimbal 27, the gimbal 25, and the flying head 26 associated therewith will be described later.

Flying head 2 with objective lens 21
Whether or not the pressure applied to 6 is appropriate is determined by detecting the drive current Ia flowing through the focus coil 23,
The specific configuration is shown in FIG.

In the configuration of FIG. 4, a push-pull circuit 30 including transistors 28 and 29 is provided at the final stage of the focus drive circuit 22. The emitters of the transistors 28 and 29 are connected to one end of the focus coil 23. Incidentally, in FIG. 4, 41, 42
Is a terminal for supplying a power supply voltage, and 43 is a terminal for supplying a drive signal.

One end of the focus coil 23 is connected between the emitters of the transistors 28 and 29 as described above, and the other end is connected to one end of the resistor 36 of the detection circuit 35 and the input side of the amplifier 37. It is connected.

As shown in FIG. 4, the detection circuit 35 includes
It is mainly composed of a resistor 36 and an amplifier 37. One end side of the resistor 36 and the input side of the amplifier 37 are connected to the other end side of the focus coil 23, the other end side of the resistor 36 is grounded, and the output side of the amplifier 37 is A / A through a terminal 38. It is connected to the D conversion circuit 39.

The voltage generated across the resistor 35 is supplied to the A / D conversion circuit 39 via the terminal 38, and the voltage is converted into digital data by the A / D conversion circuit 39 and the CPU 6
Is supplied to.

The CPU 6 compares the voltage value represented by digital data with a predetermined reference value. Based on the comparison result, the focus drive circuit 22 is controlled so that the flying head 26 is pressed with a predetermined pressure. This realizes the function of pressing the flying head 26 with a predetermined pressure.

Further, whether or not the flying head 26 has been retracted and whether or not the flying head 26 has reached a specified flying height is detected by the detecting section 51 having the configuration shown in FIGS. 5 and 6.

FIG. 5 shows a detector 52 arranged below the flying head 26 and the objective lens 21 [in the opposite direction of arrow A]. Further, FIG. 6 shows the configuration of the detection unit 51.

As shown in FIG. 6, the detector 51 includes a detector 52 for converting the reflected light of the laser light into an electric signal.
And a level difference detection circuit 53 for detecting whether or not there is a difference in the level of the reflected light of the laser light depending on the area.

The detector 52 shown in FIG. 6 is composed of a detector 52a arranged on the inner peripheral side and a detector 52b arranged on the outer peripheral side. Detector 5
The electric signal photoelectrically converted by 2a and 52b is supplied to the level difference detection circuit 53.

In the level difference detection circuit 53, a voltage value corresponding to the level difference between the incident light amounts of the detectors 52a and 52b is obtained. When the voltage value is equal to or higher than the predetermined threshold level, a signal indicating that the retracting of the flying head 26 is not completed is sent via the terminal 54 to the CPU.
6 is supplied. Further, when the above voltage value does not reach the predetermined threshold level, a signal indicating that the retracting of the flying head 26 is completed is supplied to the CPU 6 via the terminal 54.

For example, as shown in FIG. 5, when the retraction of the flying head 26 is not completed,
The laser light in the shaded area is flying head 26
The magneto-optical disk 5 is not shielded by the light, and is not reflected by the magneto-optical disk 5. In such a case, a level difference occurs in the electric signals obtained by the detectors 52a and 52b, so that the voltage value formed by the level difference detection circuit 53 becomes equal to or higher than the threshold level.
It is detected that the retraction of the flying head 26 is not completed.

When the retracting of the flying head 26 is completed, there is no level difference between the electric signals obtained by the detectors 52a and 52b, so that the voltage value formed by the level difference detecting circuit 53 is The threshold level has not been reached, so it is detected that the retraction of the flying head 26 has ended.

The configuration of the detecting section 51 is not limited to the example shown in the figure. For example, it is possible to use the configuration as shown in FIG. The configuration shown in FIG. 7 is
At the predetermined position of the hole 47, the claw portion 5 is formed so that only the beam BJF of the laser light in just focus is not interfered.
It is also possible to provide 7. In other words, when the beam diameter of the laser beam is larger than the beam BJF described above, the claw portion 57 interferes with the laser beam, so that it is possible to detect that the flying head 26 has not been retracted. Become.

The operation of the lifter mechanism 17 will be described below with reference to FIGS. In addition, in FIG. 8, LFS1
Indicates a movable range in the vertical direction of the objective lens 21, that is, in the focus direction, and LLS indicates a laser light beam.

When the system is in a non-operating state or a standby state, as shown in FIGS. 8 and 9, the objective lens 2 is used.
The position 1 is the position D at the lower end of the range LFS1 described above.
The objective lens 21 is moved to the position D when the power is off, when the focus is out of focus, and when the flying head 26 is out, and then shifts to the standby state.

In this case, the lifter gimbal 27 moves downward on the lower surface of the objective lens 21 [indicated by arrow A in FIGS. 8 and 9].
Reverse direction]. Therefore, the gimbal 25 and the flying head 26, which are fixed to the lifter gimbal 27, are also pushed down. In this state, the flying head 26 is kept away from the lower surface 5c of the magneto-optical disk 5.

Next, when the system is turned on, the focus is pulled in and the operating state is set. At this time, the objective lens 21 moves from the standby state as follows.

[1] A control signal is supplied from the CPU 6 to the focus drive circuit 22, and a drive current Ia is supplied from the focus drive circuit 22 to the focus coil 23. As a result, the objective lens 21 moves upward (see FIG. 8).
Middle, arrow A direction].

Gimbal 25 and lifter gimbal 27
Is urged in the upward direction (the arrow A direction in FIG. 8), the gimbal 25 and the lifter gimbal 27 are also moved in the upward direction (the arrow A direction in FIG. 8) in accordance with the movement of the objective lens 21. Moving. As a result, the flying head 26 also moves upward.

When the objective lens 21 reaches the position C in FIG. 8, the flying head 26 is gently landed on the lower surface 5c side of the magneto-optical disk 5. Further, it is moved toward the position B.

[2] The position B is the just focus point of the objective lens 21, but at this stage, the above-mentioned detection unit 51 has not reached the specified flying height necessary for the flying head 26 to fly stably. Detected by. Then, it passes through the position B and is further moved toward the position A.

[3] At the stage where the objective lens 21 reaches the position A in FIG. 8, as shown in FIG.
1 and the flying head 26 contact each other. At this time, a predetermined pressure is applied to the flying head 26 by the objective lens 21.

The pressure applied by this pressing is fed back to the CPU 6 through the path of the focus coil 23, the detection circuit 35, and the A / D conversion circuit 39 described above. Then, the drive current Ia is supplied from the focus drive circuit 22 under the control of the CPU 6 so that the pressure reaches a predetermined level.

At the stage where the objective lens 21 reaches the position A in FIG. 8, the flying head 26 floats on the lower surface 5c side of the magneto-optical disc 5 while maintaining a predetermined flying height by negative pressure, for example, about 0.1 μm. There is.

[4] After the flying head 26 is retracted, the objective lens 21 is again moved downward (indicated by arrow A in FIG. 8).
In the opposite direction], select the just focus point. As a result, the just-focus point is detected at the position B by the detection unit 51 described above. As a result, the movement of the objective lens 21 is stopped at the position B and the focus is turned on.

By the way, in an emergency or when the power is turned off, as shown in FIG. 10, the above [2] → [1]
→ Move to the standby state. In the process of [1] → standby state, since the objective lens 21 moves downward [the direction opposite to the arrow A in FIG. 8], the lifter gimbal 27, the gimbal 25, the flying head 26, etc. are also downward. Move to.

In this embodiment, at the time of shifting from the standby state to the focus pull-in state, the focus coil 23 is biased upward as the drive current Ia is supplied and the objective lens 21 moves upward. The moving gimbal 25 and the lifter gimbal 27 also move upward, and the flying head 26 also moves upward. In the course of this movement, the flying head 26 is stably floated by applying a predetermined pressure by the objective lens 21. After that, the objective lens 21 again moves downward, stops at the just focus point, and is turned on. on the other hand,
When shifting from the focus pull-in state to the standby state,
The objective lens 21 moves in the opposite direction to the above, and the gimbal 25, the lifter gimbal 27, and the flying head 26 also move correspondingly and shift to the standby state.

Therefore, it is possible to provide a lifter mechanism and a mechanism for applying pressure to the flying head 26 without increasing the weight of the apparatus and increasing the size of the apparatus. Further, since the focus servo mechanism is used as the drive source of the lifter mechanism, even if the lifter mechanism is provided, it is possible to prevent the feeding portion from becoming heavy and prevent deterioration of high-speed seek performance. In addition, the focus servo mechanism of the objective lens 21 which is conventionally provided is used to perform NCS of the flying head 26.
It becomes possible to perform the S operation.

Further, it is possible to perform reading from a magneto-optical disk having no transparent substrate [hereinafter referred to as surface reading]. Then, the pressure applied to the flying head 26 of the objective lens 21 can be arbitrarily set, and the speed of the lifter mechanism can be controlled with high precision by the focus servo.

The present invention is not limited to the above embodiment. For example, a coil for magnetic field modulation is provided on one surface of the magneto-optical disk 5, an optical pickup 3 is provided on the other surface, and the coil and the optical pickup 3 are connected by a link mechanism or the like. It is also applicable to a recording device.

[0068]

According to the recording apparatus of the present invention, the lifter mechanism and the pressing mechanism for the flying head can be provided without increasing the weight of the apparatus and increasing the size of the apparatus. As a result, even if the lifter mechanism is provided, the high speed seek performance can be prevented from being deteriorated. Further, there is an effect that the NCSS operation of the flying head can be performed by utilizing the focus servo mechanism of the objective lens which is conventionally provided without providing a new mechanism.

Further, there is an effect that surface reading can be performed. Then, there is an effect that the pressure applied to the flying head can be set arbitrarily. Further, the speed of the lifter mechanism has the effect of enabling highly accurate control by the focus servo.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a recording / reproducing apparatus according to the present invention.

FIG. 2 is a block diagram showing a main part of a recording / reproducing apparatus according to the present invention.

FIG. 3 is a schematic perspective view showing a flying head.

FIG. 4 is a block diagram showing configurations of a focus drive circuit and a detection circuit.

FIG. 5 is an explanatory diagram showing an operation of a detection unit.

FIG. 6 is a block diagram showing a configuration of a detection unit.

FIG. 7 is a block diagram showing a modified example of a detection unit.

FIG. 8 is an explanatory diagram showing the operation of the lifter mechanism.

FIG. 9 is an explanatory diagram showing the operation of the lifter mechanism.

FIG. 10 is an explanatory diagram showing the operation of the lifter mechanism.

[Explanation of symbols]

 3 Optical Pickup and Magnetic Field Generation Unit 5 Optical Disk 6 CPU 16 Optical Pickup 17 Lifter Mechanism 21 Objective Lens 23 Focus Coil 24 Supporting Member 25 Gimbal 26 Flying Head 27 Lifter Gimbal 35 Detection Circuit A Direction

Claims (1)

[Claims] 1. A recording device for recording on a recording medium using a negative pressure type flying head, and moving means for moving both the flying head and the objective lens in the same direction by being urged toward the recording medium side. When the objective lens moves in a direction away from the recording medium in the standby state, the moving means moves the flying head in a direction away from the recording medium, and when the focus is pulled, the objective lens is A recording apparatus, characterized in that, when moved in a direction of approaching a recording medium, the flying head is brought closer to the recording medium by the moving means, and a predetermined pressure is applied to the flying head to stably float.