JPH0340209A - Rotary magnetic head height controller - Google Patents

Abstract

PURPOSE:To enable recording with high accuracy and to secure the compatibility of a recording tape by detecting the height of a rotary magnetic head, comparing the height with a reference value and controlling an electric/mechanical converting element so that the head height can be same. CONSTITUTION:When a rotary magnetic head 18 is rotated just above a head height detecting means 22 by utilizing a rotary phase signal, light 23 is projected and received and the head height is detected. The detected value is compared with the reference value, which is recorded to a memory, in a subtracting circuit and based on a compared result, a voltage is generated by a positioning voltage generating circuit and impressed to an electric/mechanical converting element 19. Accordingly, the rotary magnetic head 18 can be displaced corresponding to the polarity and size of the voltage and the head height can be controlled to be same with the high accuracy. Thus, the head for reproducing can be used even at the time of recording as well, the recording accuracy is improved and the compatibility of the recording tape is guaranteed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording/reproducing device, in which the height of the rotating magnetic head attached to the movable end side of an electro-mechanical conversion element is used for recording. This relates to a control device.

Conventional technology A conventional rotary magnetic head device will be described below.

FIG. 4 is a state diagram of a conventional rotary magnetic head installation.

In the figure, 1 is a rotating cylinder.

Reference numerals 2 and 3 designate rotary magnetic heads for recording, which are attached to head bases 4 and 5, respectively. 5 are each fixed to the rotary cylinder 1 by fixing screws 6.7. 8 and 9 are rotary magnetic heads for reproduction, each of which is attached to the movable end side of the electro-mechanical conversion element 10.11, and the fixed end side of each of the electro-mechanical conversion element 10.11 is attached to the mounting base 12. .13, and the mounts 12 and 13 are fixed to the rotary cylinder 1 with fixing screws 14 and 15.

Regarding the rotating magnetic head device configured as above,
The operation will be explained below.

The rotary magnetic heads 2 and 3 for recording are fixed to the rotary cylinder 1 with their head heights adjusted to be the same. During recording, since it is necessary to keep the head height the same, recording is performed using rotating magnetic disks 2 and 3 for this recording. Rotating magnetic head for reproduction 8. 9 is attached to the movable end side of the electro-mechanical conversion element 10.11, and can be displaced in a direction perpendicular to the scanning direction by applying a voltage to the electro-mechanical conversion element 10.11. During playback, it is necessary to scan the recording track correctly, so the positioning voltage is applied to the electro-mechanical transducer
, tt to control the height of the rotary magnetic heads 8 and 9 for reproduction.

Problems to be Solved by the Invention However, in the conventional configuration, when the rotating magnetic head for reproduction is used for recording, it is necessary to keep the head height the same, but the rotating magnetic head does not perform electro-mechanical conversion. Because it is attached to the movable end of the element,
When the applied voltage is zero, the head height tends to fluctuate when force is applied, and since there is no means for detecting the head height, it is difficult to keep the head height the same. For this reason, it is necessary to provide separate heads for recording and reproduction, which poses a problem in that the number of heads increases accordingly.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide a rotary magnetic head height control device for using a conventional reproducing head also during recording.

Means for Solving the Problems To achieve this object, the rotating magnetic head height control device of the present invention includes a head height detecting means for detecting the head height of the rotating magnetic head, and a head height detecting means for detecting the head height of the rotating magnetic head. A head height comparison means for comparing a value indicating the detected head height with a reference value, and based on the comparison result, drives an electro-mechanical conversion element to which a rotating magnetic head is attached so that the head heights are the same. and a driving means for.

Effect: With the above-described configuration, the present invention detects the head height during recording, compares the value indicating the detected head height with a reference value, and rotates the head so that the head height is the same based on the comparison result. Since the electro-mechanical transducer to which the magnetic head is attached is driven, the height of the head attached to the movable end of the electro-mechanical transducer can be made the same with high precision during recording, which is different from conventional playback devices. The head can also be used for recording, eliminating the need for a conventional recording head.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a layout diagram of the head height detection section.

In the figure, 18 is a rotating cylinder, and 17 is a lower cylinder. Reference numeral 18 denotes a rotating magnetic head, which is attached to the movable end side of an electro-mechanical transducer (bimorph) 19. Furthermore, the fixed end side of the electro-mechanical transducer 19 is attached to a mounting base 20. 20 is the fixing screw 21
It is fixed to the rotating cylinder 16 by. 22 is a head height detection means, which faces the rotating magnetic head 18;
It is arranged at a position where the head height of the rotating magnetic head 18 can be detected. The head height detection means 22 is, for example, an optical distance sensor, and can detect the distance from the sensor to the object by projecting light onto the object and receiving reflected light.

The operation of the rotating magnetic head height control device of this embodiment configured as described above will be explained below.

During recording, the rotating cylinder 16 is rotating at high speed, and the rotating magnetic field 18 is connected to the electro-mechanical transducer 19 and the mounting base 20.
Since it is attached to the rotary cylinder 16 via the rotary cylinder 16, it rotates together with the rotary cylinder 16. Therefore, in order to detect the head height, a rotational phase signal is used to emit and receive light 23 when the rotating magnetic head 18 rotates directly above the head height detection means 22. Make sure to detect the height. By setting the location where the head height is detected to be the core portion of the rotating magnetic head 18, the head height can be detected correctly.

FIG. 2 is a flowchart of head height control. The head height is detected by the head height detection means 22. The head height comparison means (subtraction circuit) 25 compares the value indicating the detected head height with the reference value stored in the reference value storage means (memory) 24. Based on this comparison result, a voltage is generated by the positioning voltage generating means (voltage generating circuit) 28 and applied to the electro-mechanical conversion element 19.

FIG. 3 is an operation diagram when voltage is applied to the electro-mechanical conversion element. By applying the positioning voltage generated by the positioning voltage generating means 26 of FIG. 2 to the electro-mechanical conversion element 19, the rotating magnetic head 18 can be displaced according to the polarity and magnitude of the voltage as shown by the broken line. This allows the head height to be controlled uniformly with high precision.

As described above (4) According to this embodiment, by performing the control from head height detection to positioning voltage generation as shown in Figure 2 throughout the recording process, the head height is always maintained at the same level with high precision during recording. Furthermore, there is no need for mechanical fine adjustment of the head height, which was sometimes required in the past when mounting a recording head, making the mounting simple and eliminating the problem of changes in head height over time. Furthermore, if the head height when playing back a reference tape on which recording is accurately performed is stored in advance in the reference value storage means 24 shown in FIG. 2, and this is used as the reference value. , the compatibility of recorded tapes can be guaranteed.

Effects of the Invention As described above, the present invention detects the head height of a rotating magnetic head and compares a value indicating the head height with a reference value to make the head heights the same based on the comparison result obtained. Because the structure controls the electro-mechanical transducer so that the height of the rotary magnetic head attached to the movable end of the electro-mechanical transducer is maintained at the same height during recording, it is possible to maintain the same height with high precision, making it possible to By using this head during recording, it is now possible to guarantee high precision recording and compatibility of the recorded tape, and the conventional recording head can be eliminated, which has a great effect.

[Brief explanation of drawings]

Fig. 1 is a layout diagram of the head height detection section in an embodiment of the present invention, Fig. 2 is a flowchart of head height control in the same embodiment, and Fig. 3 is a diagram showing the flowchart when voltage is applied to the electro-mechanical conversion element. FIG. 4 is a state diagram showing the installation of a conventional rotary magnetic head. 16...Rotating cylinder, 18...Rotating magnetic head, ■9...Electro-mechanical conversion element, 22...Head height detection means, 24...Reference value storage means,
25...Head height comparison means, 26...Positioning voltage generation means.

Claims (1)

[Claims] A head height detection means for detecting the height of a rotating magnetic head; and a head height comparison means for comparing a value indicating the head height detected by the head height detection means with a reference value. A rotating magnetic head height control device comprising: a driving means for driving an electro-mechanical transducer to which a rotating magnetic head is attached so that the head heights are the same based on the comparison result.