JP2539364Y2 - Floppy disk drive unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a floppy disk drive unit, and in particular, a magnetic head carriage having a magnetic head for recording and reproducing data on and from a floppy disk is reciprocally provided on a base plate. And a position detector provided on the base plate for detecting a retreat limit position of the magnetic head carriage with respect to the received floppy disk in a reciprocating motion of the magnetic head carriage.

[Description of Prior Art] Referring to FIGS. 3 and 4, a conventional floppy disk drive unit is provided on a base plate 11 with a floppy disk.
A magnetic head carriage 14 having a magnetic head 13 for recording / reproducing is provided on the 12 so as to be able to reciprocate. In order to detect the retreat limit position of the magnetic head carriage 14 with respect to the received floppy disk 12 in the reciprocating motion of the magnetic head carriage 14, the position detector 15
11 is provided on.

Here, the “retreat limit position” of the magnetic head carriage 14
"Is the position of the magnetic head carriage 14 where the magnetic head 13 is arranged on the outermost track among the plurality of tracks on the received floppy disk.

The magnetic head carriage 14 has an arm 16 extending laterally.
have. On the other hand, the position detector 15 has a resin block 17 having a U-shaped cross section, and a light source 18 and a light receiver 19 buried in surfaces facing each other with a U-shaped gap 17a therebetween. A circuit board 20 having an electric circuit connected to the light source 18 and the light receiver 19 is fixedly provided on the resin block 17, and the circuit board 20 is fixed to the base plate 11 by screws. The fixed position is such that the bent piece 21 at the tip of the arm 16 enters the gap 17a of the resin block 17 when the magnetic head carriage reaches the retreat limit position. As a result, when the magnetic head carriage 14 comes to the receding limit position, the optical coupling between the light source 18 and the light receiver 19 is cut off, whereby the magnetic head carriage 14
14 is detected to have reached the retreat limit position. In addition,
A cover 22 is mounted on the base plate 11.

In the structure of this conventional floppy disk drive unit, a light source 18 disposed opposite to the position detector 15 is used.
A gap 17a between the sensor and the light receiver 19 extends in a direction perpendicular to the base plate 11 and opens upward.

[Problem to be Solved by the Invention] In the structure of the conventional floppy disk drive unit, since the cover 22 is provided, external light does not enter the light receiver 19. However, when the position detector 15 is adjusted by removing the cover 22, external light is incident on the light receiver 19 from above the gap 17a, so that adjustment may not be performed accurately.

The problem of the present invention is to solve such a problem.

That is, an object of the present invention is to provide a floppy disk drive unit using a light source and a light receiver as a position detector for detecting that the magnetic head carriage has reached the retreat limit position, and to adjust the position detector to external light at the time of its adjustment. An object of the present invention is to provide a floppy disk drive unit having a structure protected from being affected.

Another object of the present invention is to provide a floppy disk drive unit having a structure in which the position of the position detector can be surely adjusted in the floppy disk drive unit.

[Means for Solving the Problems] According to the present invention, there is provided a base plate for receiving a floppy disk on the upper surface, a magnetic head for recording and reproducing the received floppy disk, and reciprocating on the base plate in one direction. A magnetic head carriage movably provided, and a position detector provided on the base plate for detecting a retreat limit position of the magnetic head carriage with respect to the received floppy disk in a reciprocating motion of the magnetic head carriage; A floppy disk having a circuit board mounted on the base plate mounted with an electric circuit connected to the position detector, and a cover mounted to cover the magnetic head carriage and the position detector and the circuit board; In the drive unit, the magnetic head carriage protrudes outside the magnetic head carriage. An arm, and the position detector includes a support piece facing the gap with the arm interposed when the magnetic head carriage is at the retreat limit position, and a support piece facing the gap with the gap between the two support pieces. It consists of an installed light source and a light receiver, and is installed on the circuit board in a state in which a gap between the two support pieces does not open facing the cover, and the base plate is provided at a predetermined position on the base plate. The circuit board is provided with a slot through which the columnar projection penetrates and extends in the one direction. A floppy disk drive unit is obtained, wherein the floppy disk drive unit is mounted on the base plate by the penetrating columnar projection and a screw for fixing another point on the circuit board.

[Operation] According to the present invention, the magnetic head carriage has an arm extending outside the magnetic head carriage, and the position detector detects the gap between the arms when the magnetic head carriage is at the retreat limit position. A support piece facing with
A light source and a light receiver are installed in a plane facing each other with a gap between the two support pieces, and the gap between the two support pieces is installed so as to face the cover without opening. Therefore, when the cover is removed and the position detector is exposed, it is possible to prevent external light from entering the light receiver of the position detector as disturbing light by the closing portion at the upper portion of the gap. Therefore, even during the adjustment, the adjustment can be performed accurately without being affected by the external light.

[Embodiment] Referring to FIGS. 1 and 2, a floppy disk drive unit according to an embodiment of the present invention includes a base plate 11, a magnetic head carriage 14 having a magnetic head 13, a magnetic head carriage 14, similar to a conventional floppy disk drive unit. The position detector 15, the arm 16 projecting outwardly (downward in FIG. 1) from the magnetic head carriage 14, the bent portion 21 provided at the tip of the arm 16, and the base plate 11 are covered. It has a cover 22 provided.

The magnetic head carriage 14 is guided by a guide rod 24 which is pressed and fixed on the
It is installed so that it can reciprocate with respect to the floppy disk 12 received on 11. A motor 25 is provided on the base plate 11, and its output shaft 26 is arranged side by side with the magnetic head carriage 14, and its tip is supported by a rising member 27 rising from the base plate 11. It is preferable that the height of the rising member 27 extend to a position where the tip thereof receives the back surface of the cover 22. The output shaft 26 is a screw.
The engagement piece 28 extending from the engagement is engaged. Thus, the rotation of the motor 25 causes the magnetic head carriage 14 to reciprocate with respect to the floppy disk 12.

A position detector 15 is provided to detect the retreat limit position of the magnetic head carriage 14.

The position detector 15 in this embodiment includes a light source 18 and a light receiver arranged to detect the bent portion 21 at the tip of the arm 16 when the magnetic head carriage 14 reaches the retreat limit position as in the conventional example. It consists of 19.

However, the light source 18 and the light receiver 19 are supported by block pieces 30 and 31 as support pieces facing each other via an intermediate gap of a resin block 29 having a U-shaped vertical section. These block pieces 30 and 31 have a gap 32
Are integrally connected to each other by a connecting portion 33 which closes the upper part.

On the upper surface of the resin block 29, a circuit board 34 having an electric circuit connected to the light source 18 and the light receiver 19 is fixed.
The circuit board 34 has a hook shape, and is fixed by screws 36 on a convex strip 35 formed on the base plate 11.

A long hole 37 is formed at the tip of the hook-shaped convex strip 35 of the circuit board 34, and a columnar projection 38 rises from the convex strip 35 through the long hole 37.

As a result, the fixed position of the position detector 15 can be easily adjusted, and the rotation of the circuit board 34 around the screw 36 is prevented.

The tip of the columnar projection 38 receives the back surface of the cover 22. As a result, even if a pressing force is applied to the cover 22, the downward bending of the cover 22 is prevented by the rising members 27 and the columnar projections 38, and the cover 22 is prevented from contacting the magnetic head carriage 14. .

According to the above structure, even if the cover 22 is removed when the position detector 15 is adjusted, the exposed gap 32
Is closed by the coupling portion 33, there is almost no risk of external light being incident, and therefore, the adjustment is performed accurately.

In the description of the above embodiment, the resin block 29 is
33 is arranged facing the cover 22, but one of the block pieces 3
The outer surfaces of 0 and 31 (the surface opposite to the surface facing through the gap 32) may be disposed to face the cover 22.

According to the present invention, the magnetic head carriage has an arm extending out of the magnetic head carriage, and the position detector interposes the arm when the magnetic head carriage is at the retreat limit position. Support pieces facing each other with a gap
A light source and a light receiver are provided in a plane opposed to each other with a gap between the two support pieces. Since the gap between the two support pieces is installed so as not to open facing the cover, the cover may be removed. Even if the position detector is exposed, it is possible to minimize the possibility of external light entering the light receiver of the position detector as disturbing light, so that the adjustment can be performed accurately without being affected by external light. Therefore, a floppy disk drive unit free from malfunction can be obtained.

In addition, there is an effect that dust and the like enter the gap between the light source and the light receiver and accumulate to reduce the light intensity of the light source or hinder the sensitivity of the light receiver.

Furthermore, according to the present invention, the circuit board is provided with a columnar projection provided at a predetermined position on the base plate so as to rise from the base plate, and the circuit board to which the position detector is attached is penetrated by the columnar projection. Has a long hole, and is mounted on the base plate by a columnar projection penetrating the long hole and a screw for fixing another point on the circuit board. Accordingly, there is an effect that the position of the position detector attached to the circuit board can be surely adjusted.

[Brief description of the drawings]

FIG. 1 is a plan view showing a floppy disk drive unit according to an embodiment of the present invention, in which a cover is removed to show an internal structure thereof. FIG. 2 is a view of a portion of the position detector viewed from the direction of insertion of the floppy disk. FIG. 3 is a plan view similar to FIG. 1 showing the internal structure of a conventional floppy disk drive unit. FIG. 4 is IV- in FIG.
FIG. 4 is a cross-sectional view of a main part along line IV. 11 ... Base plate, 12 ... Floppy disk, 13 ... Magnetic head, 14 ... Magnetic head carriage, 15 ... Position detector, 16 ... Arm, 18 ... Light source, 19 ... Receiver, 21 ... ... bending part, 22 ... cover, 29 ... resin block, 30, 31 ... supporting piece, 32 ... gap, 33 ... joining part.

Claims (1)

(57) [Scope of request for utility model registration] A magnetic head carriage having a base plate for receiving a floppy disk on its upper surface, a magnetic head for recording and reproducing on the received floppy disk, and provided on the base plate so as to be reciprocally movable in one direction. A position detector provided on the base plate for detecting a retreat limit position of the magnetic head carriage with respect to the received floppy disk in a reciprocating motion of the magnetic head carriage, and an electric device connected to the position detector. In a floppy disk drive unit having a circuit board mounted with a circuit and attached to the base plate, and a cover attached so as to cover the magnetic head carriage and the position detector and the circuit board, the magnetic head carriage includes: An arm extending out of the magnetic head carriage; The arm comprises a support piece facing the gap with the arm interposed when the magnetic head carriage is at the retreat limit position, and a light source and a light receiver installed in a plane facing each other with the gap between the two support pieces. A column formed in such a manner that a gap between the two support pieces is not opened facing the cover, and is provided on a predetermined position of the base plate so as to stand up from the base plate. The circuit board has a slot through which the columnar projection penetrates and extends in the one direction, the columnar projection penetrating the slot, and the circuit A floppy disk drive unit attached to the base plate with a screw for fixing another point on the plate.