JPS63164080A - Recording head driving device - Google Patents

Abstract

PURPOSE:To minimize deformation and expansion/shrinkage of an electric wire to be minute and hence to prevent a harmful influence on a magnetic head positioning accuracy by composing a means to follow up the movement of a sub-slider by a positional detecting signal for an air slider which is mounted with a recording head. CONSTITUTION:A linear motor 54 for generating a drive force in non-contact with a magnetic circuit 55 is fixed, and the air slider 52 mounted with the recording head 43 is movable by non-contacting with a rail 55. By a signal of a position detector 14 for measuring a relative positional change generated by the movement of the motor 54, the sub-slider 13 is moved on a rail 11 so that the relative position between the sub-slider 13 and the linear motor 54 becomes nearly constant. Since a high pressure air pipe and the electric wire 12 which are connected between the slider 13 and the linear motor 54, are limited to a minute range of deformation and expansion/shrinkage, the positioning accuracy of the recording head 43 is never influenced to be deteriorated.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a recording head driving device for a master recording apparatus.

(Conventional technology) Conventionally, for example, master records such as optical discs have been used.

The configuration was as shown in Fig. 4, and the recording was performed by irradiating the master disc (4) placed on the surface plate (4" IJ) with a laser emitted from the recording head 4"3. The head (43) needs to be positioned with high precision, and the positioning device G441 that holds the recording head, as shown in FIG. 55), a linear motor 54) that can generate a driving force without contact has been used.However, in order to operate this device, high pressure air must be supplied to the air slider (52), and electric current must be supplied to the linear motor 64. Because it needs to flow, the slider cannot be completely free.

It was fixed to a pipe stopper 9 fixed to the base by a high-pressure air pipe supplying high-pressure air and a spring formed by an electric wire (T).

Therefore, the positioning device (44!) always pulls the spring while positioning, and the advantage of non-contact sliding parts cannot be fully utilized.
There is a problem in that it is constantly subject to disturbances due to nonlinearity.

(Problems to be Solved by the Invention) As described above, although the positioning device needs to be driven with high precision, it is always driven by pulling the spring.

The present invention has been made to eliminate such problems, and an object of the present invention is to provide a recording head driving device that eliminates the spring effects of high-pressure air pipes and power supply lines.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a sub-slider that roughly follows the positioning device, and uses this sub-slider to relay the high-pressure air pipe and the power supply line.

(Function) Control is performed so that the relative position of the sliding part slider of the Jl equipped with the recording head, the high pressure air pipe which is the connection part with the outside, and the second sliding part which is directly affected by the spring of the power supply line is constant. By doing this, the portion where the spring effect exists is not coupled, so that the driving of the recording head, which requires high-precision driving, is not affected by the spring effect at all.

(Example) Hereinafter, the present invention will be described in detail using the drawings. First, the fourth
The conventional problems will be described in detail using the configuration diagram of the master recording device shown in FIG. The master disk 0υ is fixed on a surface plate (42) and attached to a spindle motor.

While rotating the master disc (411), the recording head (43) is moved to an arbitrary radial position by a positioning device (441) to perform recording.

FIG. 5 is a diagram showing the configuration of a conventionally used positioning device. Recording head (43 is air slider 5
It is fixed at 2. The air slider can be moved without contact by supplying high-pressure air to the gap between it and the rail.

Further, the linear motor (b) is fixed to the air slider 52. The linear motor 54) generates a driving force in a non-contact manner to the magnetic circuit (g). The rail-1 magnetic circuit (to) is fixed to the surface plate (4z) by a support. With the above configuration, it is understood that the recording head can be driven and positioned from the surface plate T421 without contact. However, the air slider (52) It is necessary to install a high-pressure air pipe and electric wire □□□ that supply the high-pressure air necessary for operation and the electric power necessary to drive the linear motor (b). One end of this high-pressure air pipe and electric wire (g) is placed on the surface plate. For this reason, the Air Slider Utto Linear Motor 5 is not completely free to move from the surface plate, but is supported by the high-pressure air vibrator and the springs of the electric wires 58. Therefore, during precise positioning of the recording head (43), disturbances are transmitted by the spring.

The tension becomes unstable due to the non-linearity of the spring's extension, and positioning accuracy cannot be improved.Since the linear motor (G) is constantly pulling the spring, it requires extra thrust and becomes larger. There was a point.

FIG. 1 is a diagram showing an embodiment of the present invention. The recording head (43 is attached to the air slider 521).

Air sliders z move without contacting the rail mark. I.J.
The near motor 64) generates driving force without contact with the magnetic circuit 69. The linear motor 6 is fixed to the air slider C (3. The rail mark and the magnetic circuit 551 are fixed to the support and the surface plate! 42 K. High pressure air pipe to the air slider 6z and the linear motor 1541 and the electric wire 5B are coming out from a sub-slider α3 provided separately.This sub-slider rt3) is equipped with a position detector (■), which detects relative changes occurring as the linear motor 5a moves without contact. are being measured. This position signal causes the sub-slider a3 to move on the rail αυ, and is controlled so that the relative position with respect to the linear motor 541 is below a certain value. This sub slider (
13) For example, a cylindrical air bubble 1 whose one end is fixed on a surface plate by a fixing device (5) and a \lL line 6 are drawn.The above configuration produces the following effects.

Since the relative position between the sub-slider a3 and the near motor (incorporated) with respect to the moving direction is almost constant, the deformation and expansion/contraction of the high-pressure air pipe and electric wire clδ that connect the sub-slider (13) and the near motor 54 are slight, and the linear motor 64 ) can be ignored as a load.

Therefore, the adverse effect on the positioning accuracy of the high-pressure air pipe and the electric wire (g) described above can be ignored.

Note that it is sufficient to follow the sub-slider (13 is the linear motor 54 relatively roughly) and to generate enough thrust to pull the high-pressure air pipe and electric wire iron, so a simple configuration can be used. For example, a linear pulse motor, a method in which a contact type slider (cross roller guide, dovetail guide, etc.) is driven by a screw rotated by a motor, or a method in which a part of the slider is pulled with a wire can be considered.

Furthermore, the position detector α only needs to be non-contact with the linear motor (incorporated), and does not require much accuracy, so for example, as shown in FIG.
There is a method using @ and a shield plate device.

The shield plate (to) is fixed to the linear motor (b).

Further, the photointerrupter Qυ, 12B is fixed to the sub-slider (13). Here, if the relative position deviates and the linear motor (b) moves in the direction A, the photointerrupter operates and a signal is generated at the output terminal Qa. This signal moves the sub-slider (13) in the direction of A using any of the methods described above.

If the slider shifts in the direction B, the photointerrupter Cυ operates, a signal appears at the terminal C''!j, and the sub-slider (13) is moved in the direction B.

In another embodiment, as shown in FIG. 5, the high-pressure air pipe and electric wire az connected to the IJ near motor (b) are made rotatable around the attachment point of the sub-slider 03. Switch c32. Place (to). If the linear motor (
If the relative positions of the sub-slider (13) and the high-pressure pipe are tilted in the direction of A, then turn the switch (
(to) is activated, an output appears at terminal (b), and sub-slider a3 is moved in the direction of A. On the other hand, if it deviates in the direction B, the sub-slider α3 is moved in the direction B by the action of the switch r32 and the terminal (G). Even with the above-mentioned simple configuration, the sub-slider (13) and its control method can sufficiently reduce the spring effect exerted on the slider by the high-pressure air pipe and electric wire.

〔Effect of the invention〕

As described in detail above, according to the present invention, by providing a sub-slider that roughly follows the linear motor and air slider, it is possible to relay the high-pressure pipe and power supply line to the linear motor and air slider. The negative influence on the positioning accuracy of the recording head due to the spring effect can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a master recording device according to the present invention, and FIGS. 2 and 3 are diagrams showing a position detector used in the present invention. FIG. 4 is a schematic diagram of a conventional master recording device, and FIG. 5 is a diagram of a conventional positioning device. 52...Air slider, 54...Linear motor 1
3...Sub slider, 14...Photo interrupter 12.58...High pressure air pipe and T wire. Figure 2 Figure 3

Claims (3)

[Claims] (1) A first sliding section that is provided with a recording head and is driven in a non-contact manner with respect to the first guide; and a first sliding section that is provided without being coupled to the first sliding section and that is driven with respect to the second guide. a second sliding part, means for coupling the second sliding part to the outside, and means for detecting a relative position between the second sliding part and the first sliding part; A recording head driving device characterized in that the second sliding section follows the first sliding section in order to correct a relative position error from the position detecting means due to the driving of the sliding section. (2) The recording head drive device according to claim 1, wherein the first sliding section includes an air slider section and a linear motor drive section. (3) The recording head drive device according to claim 1, wherein the coupling means comprises an air pipe and an electric wire for attaching air and signals from the outside.