JPH0831068A - Media drive device - Google Patents

Abstract

PURPOSE:To provide a media drive device structure having a small lifting stroke of a disk holder without requiring assembling accuracy. CONSTITUTION:The media drive device is constructed in such a manner that disk holder 4 is positioned on a device frame 1 to which a rotary drive head 2 and a reading head 3 are attached and a media disk MD is brought into a reproducing state close to the device frame 1 by the movement of a pair of lift cam plates 6L and 6R slidably provided on both sides of the disk holder 4. A linking lever 11 is attached to the surface of the disk holder 4 so as to be rotatable with a middle part as a fulcrum, both end parts of the linking lever 11 are engaged with the lift cam plates 6L and 6R and via the linking lever 11 the lift cam plate 6L is moved following the sliding movement of the lift cam plate 6R.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a media drive device such as an FD (floppy disk) drive device, a CD (compact disk) drive device, an MD (mini disk) drive device, and more particularly, a lift type media drive device. Concerning the structure of.

[0002]

2. Description of the Related Art Generally, in a media drive device such as an MD drive device, a rotary drive motor and a read head are mounted on a frame of the device, but a media disk held by a disc holder is mounted on the rotary drive motor and the read head. It is necessary to move it to the position and put it in the playback state. That is, FIG. 3 and FIG. 4 show a conventional lift type MD drive device, and a collet B (rotational drive) for rotating a disc built in an MD disc MD with respect to a device frame A which is a reference for assembling the device. motor)
And a read head C for reading the information recorded on the disc.

At the center of the surface of the device frame A, a disc holder D on which the MD disc MD can be loaded.
However, a pair of lift cam plates F ₁ and F ₂ that can move in the loading direction of the MD disc MD along the guide pins E on the surface of the device frame A are located on both sides of the disc holder D. Lift cam plate F
₁ and F ₂ are connected to each other by an eject plate G extending in a direction perpendicular to the loading direction of the MD disc MD.

More specifically, a biasing spring H is applied between the apparatus frame A and each of the lift cam plates F ₁ and F _2, and these biasing springs H cause the eject plate G and both lift cam plates. F ₁ and F ₂ are urged toward the front in FIG. 3, and a plurality of driven pins I protruding from the side surface of the disk holder D are driven by the lift cams f formed on both lift cam plates F ₁ and F _2. It will be. Reference numeral "J" in FIGS. 3 and 4 designates movement preventing pawls folded from the apparatus frame A, and these movement preventing pawls J are engaged with a part of the driven pin I and lift cam plate F ₁ , F ₂
The disc holder D is prevented from moving along the surface of the device frame A as the disc moves.

Therefore, in such an MD disk drive device, when the eject plate G is pushed against the bias of the bias spring H, both lift cam plates F ₁ , fixed to the eject plate G, F ₂ slides in the same direction, and the action of the lift cam f lowers the disc holder D to the reproducing state shown in FIG. 4, so that the read head C can reproduce.

[0006]

However, according to the structure of such a conventional MD drive device, since the eject plate G is interposed between the surface of the device frame A and the disc holder D, the disc holder D is formed. Has a large lift stroke, and the thickness of the drive device becomes thicker by the thickness of the eject plate G, which makes it difficult to miniaturize, and also the spot ejected eject plate G and lift cam plates F ₁ , F ₂ It was difficult to maintain the flatness of the whole because the assembly of and was a large-sized "U" -shaped member as a whole. That is,
Although this assembly needs to be flush with the surface of the device frame A, it is difficult to obtain such flatness by spot welding, and there is a problem of poor product yield. In view of the problems of the conventional media drive device as described above, it is an object of the present invention to obtain a media drive device structure in which the assembling accuracy is not required and the lift stroke of the disc holder is small.

[0007]

In order to achieve this object, the present invention provides a slidable disk holder having a disk holder positioned on a device frame to which a rotary drive motor and a read head are assembled and positioned on opposite sides of the disk holder. In a media drive device in which a media disc is brought into a reproduction state in which it approaches a device frame by moving a pair of lift cam plates, a linkage lever rotatable about an intermediate portion as a fulcrum is attached to the surface of the disc holder. The present invention proposes a media drive device in which both ends are engaged with both the lift cam plates, and the other lift cam plates are driven by the sliding motion of one lift cam plate via the same linkage lever.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the embodiments of the present invention will be described below with reference to FIGS. 1 and 2 show an MD drive device according to the present invention. The MD drive device is a collet 2 for rotating a disc built in an MD disc MD with respect to a device frame 1 which is a reference for assembling the device.
It is the same as the conventional one in that the (rotational drive motor) and the reading head 3 for reading the information recorded on the disk are assembled.

A disc holder 4 on which the MD disc MD can be loaded is provided in the center of the surface of the apparatus frame 1.
Are arranged on both sides of the disc holder 4 along the plurality of guide pins 5 on the surface of the apparatus frame 1 and the MD disc M.
A pair of lift cam plates 6 that can move in the D loading direction
L, 6R are located. That is, in the horizontal portions of these lift cam plates 6L, 6R, a plurality of guide pins 5 planted on the surface of the device frame 1 are inserted into the longitudinal holes 6a in the front-rear direction.
However, these lift cam plates 6 are formed.
Lift cam plate 6R on the right side for driving L and 6R
Rack teeth 8 meshing with a drive gear 7 provided on the rear portion of the apparatus frame 1 are formed on the extension portion 6b of the device.

Spring hooks 1a and 6c are cut and raised on the surface of the apparatus frame 1 and the lift cam plates 6L and 6R, and an urging spring 9 is hooked between these spring hooks 1a and 6c. Both lift cam plates 6L and 6R are biased toward the front in FIG. 1 by the bias spring 9. Although lift cams 6d for guiding the driven pins 10 projecting from the side surface of the disc holder 4 in which the MD disc MD is loaded are formed in the vertical portions of the lift cam plates 6L and 6R, respectively. As will be apparent from the description below, the front and rear directions of the left and right lift cam plates 6L and 6R are reversed. In addition, on the surface of the device frame 1, a movement preventing claw 1b that engages with a part of the driven pin 10 of the disc holder 4
Since the disk holder 4 is cut and raised, the disk holder 4 can move only in a direction perpendicular to the surface of the device frame 1.

At the center of the surface of the disc holder 4, a rotation center portion 4a which can be inserted into the center hole 12 of the intermediate portion of the linkage lever 11 is formed in a protruding manner, and the linkage lever 11 is detached from the left and right surfaces of the disc holder 4. The preventive pins 13 and the arcuate guide holes 4b corresponding to these disengagement preventive pins 13 prevent the disengagement from the disc holder 4. Further, the lift cam plates 6L, 6L,
Since the linking pins 14 that engage with the linking ears 6e that are erected from the vertical portion of the 6R are fixed, the lift cam plates 6L and 6R move in accordance with the rotational movement of the linking lever 11.
Can slide in the opposite direction.

Since the MD disk drive device of the illustrated embodiment has the above-mentioned structure, the media drive device of the disk holder 4 with respect to the device frame 1 to which the collet 2 and the read head 3 are assembled is the drive gear 7.
It can be controlled by the rotation of. That is, when the right lift cam plates 6L, 6R are slid in the direction of the arrow against the bias of the bias spring 9, the motions of the lift cam plates 6L, 6R are mediated by the linkage lever 11 and the left lift cam plates 6L, 6R are moved. The left lift cam plate 6 is transmitted to the plates 6L and 6R.
L and 6R are slid in the opposite direction to the right lift cam plates 6L and 6R, and these lift cam plates 6L and 6R
The lift cam 6d lowers the disc holder 4 to the reproduction state shown in FIG. Of course, in order to take out the MD disc MD, the disc holder 4 rises due to the reverse rotation of the drive gear 7, so that the collet 2 and the reading head 3 are detached from the MD disc MD, so that the MD disc MD becomes free.

Further, in the illustrated structure, since there is no obstructive member between the surface of the device frame 1 and the disc holder 4, the lift stroke of the disc holder 4 is reduced and the dimension in the thickness direction is reduced. Therefore, the structure is suitable for a band-type drive device that requires miniaturization.

Further, each lift cam plate 6L, 6R
Is independently assembled to the apparatus frame 1, the planarity of the lift cam plates 6L and 6R as a whole is not required as in the conventional case, and the yield rate can be improved.

[0015]

As is apparent from the above description, according to the present invention, the lift cam plates are independent of each other, and there is no obstructive member between the surface of the apparatus frame and the disk holder. Thus, there is an effect that the media drive device can be miniaturized without requiring assembling accuracy.

[Brief description of drawings]

FIG. 1 is an overall exploded perspective view of an MD drive device according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the MD drive device in a reproducing state.

FIG. 3 is an overall exploded perspective view of a conventional MD drive device.

FIG. 4 is an enlarged cross-sectional view of an essential part of the MD drive device in a reproducing state.

[Explanation of symbols]

 1 Device Frame 2 Collet 3 Read Head 4 Disk Holder 4a Rotation Center 6L, 6R Lift Cam Plate 6d Lift Cam 11 Link Lever 14 Link Pin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiichi Yoneyama 1601 Sakai, Atsugi-shi, Kanagawa Mitsumi Electric Co., Ltd. Atsugi Plant

Claims (1)

[Claims] 1. A medium holder is mounted on a device frame on which a rotary drive motor and a read head are mounted, and a media disc is mounted on the device frame by movement of a pair of slidable lift cam plates positioned on both sides of the disc holder. In a media drive device that is brought into an approaching reproduction state, a linking lever that is rotatable around an intermediate portion as a fulcrum is attached to the surface of the disk holder, and both ends of the linking lever are engaged with both the lift cam plates so that the linking is performed. A media drive device characterized in that the sliding motion of one lift cam plate is followed by the other lift cam plate via a lever.