JPS62121959A - Head positioning device in flexible disk device - Google Patents

Abstract

PURPOSE:To effectively suppress the external vibration with a simple constitution by setting an interval between a vibration-proofing projection installed on a carriage and a head arm to appropriate dimensions. CONSTITUTION:The carriage 5 supporting a lower head 3 is provided with the projection 5a, and the interval (d) is formed between the arm 6 supporting an upper head 4 and the projection. The size of the interval (d) is set to the dimensions which ensures the appropriate information recording and reproducing when the arm vibrates. Accordingly, even if vibration is applied from the outside and the arm 6 resonates, the projection 5a abuts on the arm 6 to control amplitude, whereby the vibration will not affect the recording and reproducing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is mainly used for reading information recorded on recording media made of flexible disks such as floppy disks used in information processing devices such as personal computers and word processors. The present invention relates to a flexible disk device that writes information to a recording medium, and particularly to a head positioning mechanism that improves vibration resistance by stably reading and writing information even when the device body vibrates.

[Conventional technology]

A conventional flexible disk device will be explained with reference to FIG. 7. In FIG. 7, reference numeral 1 indicates the positioning of a recording/reproducing head having at least one of the functions of reading and writing information of the conventional flexible disk device. This positioning mechanism 1 has a pair of upper and lower recording/reproducing disks 4 and 3 for reading and writing information on a recording medium 2 made of a flexible disk such as a floppy disk. The head 3 is supported by a carriage 5, and the upper head 4 is supported by an arm 6 disposed above and parallel to the carriage 5 so as to face the lower head 3 with the recording medium 2 in between. The arm 6 supporting the upper head 4 is elastically pushed downward by a biasing means 7, so that the upper and lower heads 4.3 come into contact with the upper and lower surfaces of the recording medium 2 with an appropriate pressing force. It is supposed to be done. The biasing means 7 is made of a spring such as a torsion spring, and its base end is attached to a bracket 9 fixed to the upper surface of the carriage 5 with a set screw 8 or the like.
At the same time, the tip is pressed against the upper surface of the arm 6.

[Problem that the invention seeks to solve]

In a flexible disk device incorporating the conventional head positioning mechanism 1 described above, when vibration is applied to the flexible disk device main body, the vibration is transmitted to the head positioning mechanism 1, and the arm 6 supporting the upper head 4 also vibrates. , near the resonance frequency of the arm 6, the arm 6
As the amplitude of the upper head 4 increases, the upper head 4 resists the pressing force of the biasing means 7 and separates from the recording medium 2, resulting in a non-contact state. As is clear from the output waveform during vibration, there is a problem in that recording/reproducing becomes unstable in some cases.

Therefore, the present invention was made to solve the above-mentioned conventional problems, and is a head in a simple and inexpensive flexible disk device that can perform stable recording/reproduction even when vibrations are applied from the outside. The purpose is to obtain a positioning mechanism.

[Means for solving problems]

In the head positioning mechanism in a flexible disk device according to the present invention, a carriage supporting one head is provided with a protrusion facing an arm supporting the other head, and the distance between the protrusion and the arm is adjusted to A size that can suppress the vibration of the arm within an amplitude that does not hinder information recording/reproduction even if the contact state between the head supported by the arm and the recording medium changes when the arm vibrates. It is set to .

[For production]

In this invention, even if the arm supporting one of the heads resonates due to external vibration, the protrusion provided on the carriage comes into contact with the arm, thereby reducing the amplitude of the arm to an extent that does not affect the recording/reproduction of information. It can be suppressed.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the accompanying drawings. In the following explanation numbers, the same members are given the same reference numerals in all embodiments.

FIG. 6 shows the appearance of an example of a flexible disk device equipped with a spatula V positioning mechanism according to the present invention, and details of the head positioning mechanism 1 will be described with reference to FIG. 1.

In FIG. 1, each member 2 to 9 constituting the head positioning mechanism 1 has the same structure as the conventional example shown in FIG. are the same.

In the present invention, a projection 5a is provided on the upper surface of the carriage 5 so as to face the lower surface of the arm 6, and a distance d between the upper end surface of the projection 5a and a portion 6a of the lower surface of the arm 6 facing the projection 5a. is set to an appropriate value that does not affect the recording/reproducing of information on the recording medium 2 even if the arm 6 resonates due to the external vibration number.

With this configuration, when vibration is applied to the flexible disk device main body, the arm 6 that supports the rad 4 to the upper part also vibrates, but the amplitude of the arm 6 is
The protrusion 5a and the opposing portion 6 on the lower surface of the arm 6 that opposes it.
If the distance between the protrusion 5 and the protrusion 5
Since the upper end surface of the arm 6 contacts the opposing portion 6a of the arm 6, the amplitude of the arm 6 does not increase any further. Therefore,
Information can be stably recorded/reproduced even at the excitation frequency at which the arm 6 resonates. Incidentally, FIG. 5 shows the upper and lower heads 4. at the resonance frequency of the arm 6 in the above embodiment. This shows the results of measuring the output status of S. From these measurement results, it can be seen that the output of both heads and headers 4 is approximately constant, and that information is being recorded and reproduced stably. Dew.

Further, in the embodiment described above, a torsion spring was used as the biasing means 7 of the arm 6, but the biasing means was, as shown in FIG.
It may be constituted by a plate spring 10, or it may be constituted by a coil spring 7b compressed between the arm 6 and the bracket 11 fixed to the carriage 5 with a set screw 8 etc., as shown in FIG. Good too.

Furthermore, in the above embodiment, the lower head 3 was directly attached to the carriage 5, but as shown in FIG.
It may be attached to the carriage 5 by means of the following.

〔Effect of the invention〕

As described above, according to the present invention, when the arm resonates,
Since the amplitude of the arm can be kept small by the protrusion provided on the carriage, information can be recorded/reproduced stably even when the arm is vibrated, and the vibration-proof structure of the arm is simple. In addition, there is no need to significantly change the configuration of the conventional device, and substantially the same component configuration can be used, so the device can be provided at a low cost.

[Brief explanation of drawings]

FIG. 1 is a side view of a first embodiment of this invention, FIGS. 2 to 4 are side views showing other mutually different embodiments of this invention, and FIG. 5 is a side view of a first embodiment of this invention. 6 is a perspective view showing the appearance of a flexible disk device equipped with a head positioning mechanism according to the present invention; FIG. 7 is a side view of a conventional example; FIG. 7 is a diagram showing a reproduced output waveform of the head at the time of arm resonance in the conventional example of FIG. 7. FIG. In the figure, (1) is the head positioning mechanism, (2) is the recording medium, (S) is the upper head (head), (4) is the lower head (head), (5) is the carriage, and (6) is the arm. , ((1) is the interval. Heat 1 Figure W-) 2 Figure - Question

Claims (1)

[Claims] It supports a pair of recording/reproducing heads that have at least one of the functions of reading information recorded on a recording medium and writing information to the recording medium, and is capable of moving and positioning the heads to a target position. In a flexible disk device having an arm and a carriage, the carriage supporting the one head is provided with a protrusion facing the arm, and the distance between the protrusion and the arm is set such that when the arm vibrates, The vibration of the arm is set to such a value that vibration of the arm can be suppressed within an amplitude that does not impede information recording/reproduction even if the contact state between the head supported by the arm and the recording medium changes. A head positioning mechanism in a flexible disk device.