JPH08263919A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE: To realize the thinning of a disk recording and reproducing device and the lowering of the cost. CONSTITUTION: An upper carriage 3 and a lower carriage 4 are shared with a single energizing member 21 in the direction for inserting and holding the disk 20a. The position of a turning fulcrum of the upper carriage 3 is arranged on the side of the disk center than the position of a turning fulcrum of the lower carriage 4, or the position of a point of force received from a head load spring 21 of the lower carriage 4 is arranged on the side of the disk center than the position of a point of force of the upper carriage 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical structure of a disk recording / reproducing apparatus, and more particularly to a mechanical structure for separating a head from a disk.

[0002]

2. Description of the Related Art A typical example of a conventional disk recording / reproducing apparatus is known in structure as disclosed in Japanese Laid-Open Patent Publication No. 62-42156, and more specifically shown in FIGS. FIG. 4 is a side view of a main part of the conventional disc recording / reproducing apparatus when the disc is at the mounting position, and FIG. 5 is a side view of the main part of the conventional disc recording / reproducing device when the disc is at the insertion / removal position. FIG. 7 illustrates an operation relationship for separating the disk.

A description will be given below with reference to FIGS. 4 to 5.

The disk 50a for recording / reproducing information shown in FIG. 4 is contained in a disk cartridge 50, and an upper head 52 for recording / reproducing on the upper surface of the disk 50a is fixed to an upper carriage 56, The head load spring 54 urges the head load spring 54 in the rotating direction 70a. Similarly, a lower head 53 for recording / reproducing on the lower surface of the disk 50a.
Is fixed to the lower carriage 57 and is urged by the lower head load spring 55 in the rotation direction 70b with a stronger urging force than the upper head load spring 54, so that the lower carriage 57 abuts a stopper 59 that stops the rotation. The upper head 52 and the lower head 53 while maintaining the head height.
Information was recorded / reproduced by sandwiching.

At the disc insertion / ejection position, the upper carriage 56 is moved to the upper head load spring 54 as shown in FIG.
In the opposite direction to the urging direction of
The lower carriage 57 is rotated in the rotating direction 71a, and the lower carriage 57 is also rotated in the rotating direction 71b in the opposite direction to the urging direction of the lower head load spring 55 in the rotating direction 71b by the moving means (not shown). The structure was such that it was separated so as to secure a gap with the head.

[0006]

In portable computers, which have been remarkably popularized in recent years, information storage devices such as a disc recording / reproducing device incorporated in the computer have been made thinner than ever due to the necessity of lightweight and downsizing. It has become necessary to reduce the size and weight. As described above, in the conventional technique, the urging member required for holding the disk is required both vertically and downward, and it is necessary to reduce the height of the urging member in order to realize a thin structure. In addition, since it is necessary to configure the same mechanism on the upper and lower sides, there is a problem in terms of cost.

Therefore, the present invention solves the above problems, and an object of the present invention is to realize a lightweight, compact and thin disk recording / reproducing apparatus, and to provide a cheaper disk recording / reproducing apparatus. To do.

[0008]

DISCLOSURE OF THE INVENTION A disk recording / reproducing apparatus of the present invention is rotated by a rotation driving device, has a plurality of recording tracks concentrically from the center of rotation, and is housed in a hard case. A first carriage having two heads for recording / reproducing information on / from a disc which can be inserted / removed, and having a first head for recording / reproducing on the upper surface of the disc and supported via an elastic member; A second carriage, which is provided with a second head for recording / reproducing on the lower surface of the disk and is supported via an elastic member, constitutes a first carriage when the disk is moved from the insertion / removal position to the recording / reproduction position. In a recording / reproducing apparatus having a mechanism in which both the first carriage and the second carriage rotate in the direction of clamping the disc, one force is applied to clamp the disc between the first carriage and the second carriage. It is configured to be shared only by the biasing member, and the rotation fulcrum position of the first carriage is arranged closer to the disk center than the rotation fulcrum position of the second carriage, or the biasing force of the second carriage is set. The force point position received from the member is arranged closer to the disk center side than the force point position of the first carriage.

Alternatively, the force for holding the disk between the first carriage and the second carriage is shared by only one urging member, and the rotation fulcrum position of the first carriage is the rotation fulcrum of the second carriage. It is arranged closer to the disc center than the dynamic fulcrum position, and the force point position received from the urging member of the second carriage is arranged closer to the disc center side than the force point position of the first carriage. To do.

[0010]

According to the above-mentioned structure of the present invention, only one urging member for the upper carriage and the lower carriage for holding the disk is provided and shared between the both, and the rotation fulcrum position of the upper carriage is further lowered. Generated by shifting the carriage to the center of the disc from the pivot point, or by making the pivot points the same and shifting the force point position from the biasing member of the lower carriage to the disc center side from the force point of the upper carriage. The difference in the rotational moment forces of the upper and lower carriages causes one end of the lower carriage to abut on the rotation stopping member, and stabilizes the lower head height position.

[0011]

1 and 2 show a suitable embodiment of a disk recording / reproducing apparatus of the present invention. FIG. 1 is a side view of essential parts showing a disk cartridge mounted state of a disk recording / reproducing apparatus of the present invention, and FIG. 2 is a side view of a main part showing a disk cartridge inserting / removing state of the disk recording / reproducing apparatus of the present invention. The operating relationship is shown to separate the head from the disk. FIG. 3 is a side view of the essential parts showing a disk cartridge mounted state as another embodiment of the disk recording / reproducing apparatus of the present invention.

First, a description will be given with reference to FIGS. A disk 20a for recording and reproducing information shown in FIG. 1 is contained in a disk cartridge 20, and an upper head 1 for recording and reproducing information on the upper surface of the disk 20a is adhered to an upper carriage 3 and further the upper carriage 3 And is fixed to the carriage holder 8 with screws 7 via the upper suspension 5 which is an elastic member, and one end of the upper carriage 3 is in contact with the contact portion 8a of the carriage holder 8. Similarly, the lower head 2 for recording / reproducing on the lower surface of the disk 20a is adhered to the lower carriage 4 and further coupled to the lower carriage 4, and is screwed to the carriage holder 8 via the lower suspension 6 which is an elastic member. , And one end of the lower carriage 4 is in contact with the contact portion 8b of the carriage holder 8. Since the upper and lower heads clamp the disk 20a with a predetermined load, a head load spring 21 is provided between the upper carriage 3 and the lower carriage 4 as a biasing means, and the upper carriage 3 uses the contact portion 8a as a rotation fulcrum position. , A moment force is generated in the rotation direction 15, and a moment force is generated in the rotation direction 16 by the lower carriage 4 with the contact portion 8b as a rotation fulcrum position to secure a stable clamping force with the disk 20. . However, in this case, since the heights of the upper and lower heads are determined at the position where the upper and lower moment forces obtained from the head load spring 21 are balanced in the sandwiched state, the head height position is not stable due to variations and the like. , Disk 20
A problem occurs in the contact state with a. Therefore, the rotation fulcrum position where the upper carriage 3 is in contact with the carriage holder 8 is located closer to the rotation center side of the disk than the rotation fulcrum position where the lower carriage 4 is in contact with the carriage holder 8. Therefore, the moment force of the lower carriage 4 in the rotation direction 16 becomes larger than the moment force of the upper carriage 3 in the rotation direction 15. This difference in moment force is received by the positioning portion 12 formed on the lower carriage 4 coming into contact with the stopper 11 provided on the carriage holder 8, and the head stands still at the recording / reproducing position. As a result, the lower head height can be stabilized, and good recording / reproducing can be realized.

In the state of the disk loading / unloading position, as shown in FIG. 2, the upper carriage 3 is rotated in the direction opposite to the urging direction of the head load spring 21 by a mechanism (not shown).
3 pushes up the pressing portion 9 provided on the upper carriage 3, and the lower carriage 4 similarly moves to the head load spring 21.
By a mechanism (not shown) in the direction opposite to the urging direction of the disk cartridge 20, the pressing portion 10 arranged on the lower carriage 4 is pushed down in the rotation direction 14, and the disk cartridge 20 and the upper and lower heads 1, 2.
The two carriages rotate in opposite directions so as to secure a gap between them, and are stopped by a stationary mechanism (not shown). In this state, the insertion / extraction operation of the disc cartridge 20 is performed.

Next, another embodiment of the present invention will be described with reference to FIG. The upper and lower heads 1 and 2 are fixed to the upper and lower carriages 3 and 4 in the same manner as described above, and similarly, the carriage holder 8 is interposed via the upper and lower suspensions 5 and 6.
It is fixed to. The rotation fulcrums of the upper and lower carriages are similarly provided on the contact portions 22 and 23 with the carriage holder 8, respectively. In the above-described embodiment, the difference between the moment forces is generated by vertically shifting the fulcrum position of the rotational moment force. In this case, the fulcrum positions are the same vertically and the force point position of the head load spring 21 is set to the upper position. The power point 25 of the carriage 4 is lower than the power point 24 of the carriage 3.
The moment force in the rotation direction 16 is larger than that in the rotation direction 15 by displacing the one toward the disk center side. As a result, the upper and lower carriages rotate in the rotation direction 16, and the lower carriage positioning portion 12 abuts on the stopper 11 also provided on the carriage holder 8 to ensure the stability of the head height position.

Further, when the method of vertically shifting the fulcrum position of the embodiment described in FIG. 2 and the method of vertically shifting the power point position of the embodiment described in FIG. The head height can be increased and a more stable head height can be secured.

[0016]

As described above, according to the present invention, one urging member exerts a force for holding the disk between the first carriage having the upper head and the second carriage having the lower head. By sharing the above, the structure is simplified and the parts cost and the assembly cost are significantly reduced. Further, since the space above the upper carriage and the space below the lower carriage are not required as compared with the conventional case, it is possible to realize a thinner disc recording / reproducing apparatus.

Since the rotation fulcrum position of the first carriage is located closer to the center of the disk than the rotation fulcrum position of the second carriage, a rotation moment force is generated in one direction to lower the head position. It is possible to secure stable quality with a structure that can stabilize.

Since the force point position received from the urging member of the second carriage is located closer to the center of the disk than the force point position of the first carriage, a rotational moment force is generated in one direction to lower the head. It is a structure that can stabilize the position, and it is possible to secure stable quality. Further, since the rotation fulcrum positions are vertically aligned, the distances of the first and second carriages from the head can be shortened, and the depth dimension of the disk recording / reproducing apparatus can be further shortened.

The rotation fulcrum position of the first carriage is located closer to the center of the disk than the rotation fulcrum position of the second carriage, and the force point position received from the biasing member of the second carriage is By being located closer to the center of the disc than the power point position of the first carriage, it is possible to generate a rotation moment force that is much stronger than that of the above method, and the weight of the first carriage and the second carriage is reduced. When it is relatively large or when the position of the center of gravity of both is closer to the point of action, it is possible to further improve vibration resistance and shock resistance, and both low cost and high quality are realized. The practical effect of the present invention is extremely large.

[Brief description of drawings]

FIG. 1 is a side view of essential parts showing a disc cartridge mounting state of a disc recording / reproducing apparatus of the present invention.

FIG. 2 is a side view of essential parts showing a disc cartridge insertion / extraction state of the disc recording / reproducing apparatus of the present invention.

FIG. 3 is a side view of an essential part of a disk showing another embodiment of the disk recording / reproducing apparatus of the present invention and showing a mounted state of the disk cartridge.

FIG. 4 is a side view of essential parts showing a mounted state of a disc cartridge of a conventional disc recording / reproducing apparatus.

FIG. 5 is a side view of essential parts showing a state in which a disc cartridge of the conventional disc recording / reproducing device is inserted / removed.

[Explanation of symbols]

 3 Upper carriage 4 Lower carriage 20 Disc cartridge 20a Disc 21 Head load spring

Claims (4)

[Claims] 1. Recording and reproduction of information on a disc which is rotated by a rotation drive device and has a plurality of recording tracks concentrically from the center of rotation and is housed in a hard case and capable of being inserted and removed. A first carriage equipped with two heads and carrying a first head for recording / reproducing on the upper surface of the disk and supported by an elastic member, and a second head for recording / reproducing on the lower surface of the disk. A direction in which a second carriage, which is mounted and supported via an elastic member, is configured so that both the first carriage and the second carriage hold the disk when the disk is moved from the insertion / removal position to the recording / reproducing position. In a recording / reproducing apparatus having a mechanism for rotating the disc, a force for holding the disc between the first carriage and the second carriage is shared by one urging member. Recording / playback device. 2. The disk recording / reproducing apparatus according to claim 1, wherein the rotation fulcrum position of the first carriage is located closer to the disk center than the rotation fulcrum position of the second carriage. 3. The disc recording / reproducing apparatus according to claim 1, wherein the force point position received from the urging member of the second carriage is located closer to the disc center side than the force point position of the first carriage. . 4. The rotation fulcrum position of the first carriage is located closer to the disk center than the rotation fulcrum position of the second carriage, and the force point position received from the urging member of the second carriage is 2. The disc recording / reproducing apparatus according to claim 1, wherein the disc recording / reproducing device is arranged closer to the center of the disc than the power point position of the first carriage.