JP3772360B2 - Disc recording / playback device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a mechanism structure of a disk recording / reproducing apparatus, and more particularly to a mechanism structure for separating a head from a disk.
[0002]
[Prior art]
As a typical example of a conventional disk recording / reproducing apparatus, a structure as disclosed in Japanese Patent Application Laid-Open No. 62-42156 is known. FIG. 4 and FIG.
4 is a side view of the main part of the conventional disk recording / reproducing apparatus when the disk is in the loading position, and FIG. 5 is a side view of the main part of the conventional disk recording / reproducing apparatus when the disk is in the insertion / extraction position. The operational relationship of separating from the disk is illustrated.
[0003]
This will be described with reference to FIGS.
[0004]
The disk 50a on which information is recorded and reproduced as shown in FIG. 4 is enclosed in a disk cartridge 50, and an upper head 52 for recording and reproducing on the upper surface of the disk 50a is fixed to an upper carriage 56, and an upper head load spring. 54 is biased in the rotation direction 70a. Similarly, the lower head 53 that performs recording / reproduction on the lower surface of the disk 50a is fixed to the lower carriage 57 and is urged in the rotational direction 70b by the lower head load spring 55 with a stronger urging force than the upper head load spring 54. The lower carriage 57 is in contact with a stopper 59 for stopping the rotation, and the upper head 52 and the lower head 53 hold the disk 50a while maintaining the head height, and information is recorded and reproduced.
[0005]
In the state of the disk insertion / extraction position, as shown in FIG. 5, the upper carriage 56 is rotated in the rotation direction 71a by the moving means (not shown) in the direction opposite to the urging direction of the upper head load spring 54, and is further lowered. Similarly, the carriage 57 is also rotated in a rotation direction 71b by a moving means (not shown) in a direction opposite to the urging direction of the lower head load spring 55, and is separated so as to secure a gap between the disk cartridge 50 and the head. Met.
[0006]
[Problems to be solved by the invention]
In recent years, portable computers, which have gained widespread popularity, need to make information storage devices such as disk recording / playback devices built into the computer thinner, smaller, and lighter than ever because of the need for lighter and smaller devices. It has become. As described above, in the conventional technique, the biasing member necessary for sandwiching the disk is required both in the upper and lower directions, and it is necessary to reduce the height of the biasing member in order to realize a reduction in thickness. In addition, there is a problem in terms of cost because the upper and lower sides need to constitute the same mechanism.
[0007]
Accordingly, the present invention solves the above-described problems, and an object of the present invention is to provide a more inexpensive disk recording / reproducing apparatus by realizing a lighter, smaller and thinner disk recording / reproducing apparatus. is there.
[0008]
[Means for Solving the Problems]
The disc recording / reproducing apparatus of the present invention is rotated by a rotary drive device, has a plurality of recording tracks concentrically from the rotation center, and is stored in a hard case so that information can be inserted into a disc that can be inserted and removed. A first carriage having two heads for recording / reproducing, having a first head for recording / reproducing on the upper surface of the disk and supported via an elastic member, and a second for recording / reproducing on the lower surface of the disk In a disk recording / reproducing apparatus comprising a second carriage mounted with an elastic member and supported by an elastic member, both the first carriage and the second carriage are moved when moving from the disk insertion / extraction position to the recording / reproducing position. Has a mechanism that rotates in the direction to clamp the disk, and the first carriage and the second carriage share the disk clamping force by a single biasing member, and Moment force in the rotational direction generated in the second carriage by member by the biasing member to be greater than the moment force in the rotational direction generated in the first carriage, said first carriage A rotation fulcrum position is disposed closer to the center of the disc than a rotation fulcrum position of the second carriage, and a rotation fulcrum position of the second carriage and a force point position received from an urging member of the second carriage; Is made longer than the distance between the rotation fulcrum position of the first carriage and the force point position of the first carriage , and the second carriage abuts against the stopper at the recording / reproducing position of the disc. It is characterized by being positioned in the rotational direction.
[0009]
Also, the disc recording / reproducing apparatus of the present invention is a disc that is rotated by a rotary drive device, has a plurality of recording tracks concentrically from the center of rotation, and is housed in a hard case so that it can be inserted and removed. A first carriage having two heads for recording / reproducing information and having a first head for recording / reproducing on the upper surface of the disk and supported via an elastic member, and recording / reproducing on the lower surface of the disk In a disk recording / reproducing apparatus comprising a second carriage mounted with a second head that is supported via an elastic member, the first carriage and the first carriage when moving from the disk insertion / extraction position to the recording / reproduction position A mechanism is provided in which both of the second carriages rotate in a direction to sandwich the disk, and the first carriage and the second carriage sandwich the disk. And the moment force in the rotational direction generated in the second carriage by the biasing member is the same as that in the rotational direction generated in the first carriage by the biasing member. The moment force is greater than the moment force, and at the recording / reproducing position of the disc, the second carriage is positioned in the rotational direction by contacting the stopper, and the force point position received from the biasing member of the second carriage is It is characterized in that it is arranged closer to the center of the disc than the position of the power point of one carriage.
[0010]
[Action]
According to the above configuration of the present invention, only the upper carriage and lower carriage urging members for clamping the disk are provided and shared between them, and the rotation fulcrum position of the upper carriage is set to the rotation of the lower carriage. The vertical movement generated by shifting to the disk center side from the moving fulcrum position or by shifting the force point position from the biasing member of the lower carriage to the disk center side from the force point position of the upper carriage with the same rotation fulcrum position. The difference in the turning moment force of the carriage brings one end of the lower carriage into contact with the turning stop member and stabilizes the lower head height position.
[0011]
【Example】
1 and 2 show a suitable embodiment of the disk recording / reproducing apparatus of the present invention.
FIG. 1 is a side view showing a main part of a disc recording / reproducing apparatus according to the present invention in a state where a disk cartridge is mounted. FIG. 2 is a plan side view showing a main part of the disc recording / reproducing apparatus according to the present invention. The operational relationship for separating the head from the disk is shown.
FIG. 3 is a side view showing the main part of a disc recording / reproducing apparatus according to another embodiment of the present invention, showing a disc cartridge mounted state.
[0012]
First, it demonstrates based on FIG. 1, FIG.
The disk 20a on which information is recorded and reproduced as shown in FIG. 1 is enclosed in a disk cartridge 20, and the upper head 1 for recording and reproducing on the upper surface of the disk 20a is adhered to the 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 8 a of the carriage holder 8. Similarly, the lower head 2 that performs recording / reproduction on the lower surface of the disk 20a is bonded to the lower carriage 4, and further coupled to the lower carriage 4, and the screw 7 is attached to the carriage holder 8 via the lower suspension 6 that is an elastic member. The one end of the lower carriage 4 is in contact with the contact portion 8 b of the carriage holder 8.
Since the upper and lower heads hold the disk 20a with a predetermined load, a head load spring 21 is provided as an urging means between the upper carriage 3 and the lower carriage 4, and the upper carriage 3 uses the contact portion 8a as a rotation fulcrum position. The lower carriage 4 generates a moment force in the rotation direction 16 with the abutting portion 8b as a rotation fulcrum position, and secures a stable clamping force with the disk 20. . However, in this case, the height of the upper and lower heads is determined at a position where the upper and lower moment forces obtained from the head load spring 21 are balanced, so that the head height position is not stabilized due to variations or the like. A problem occurs in the contact state with the disk 20a. Therefore, the rotation fulcrum position where the upper carriage 3 is in contact with the carriage holder 8 is configured to be positioned closer to the center of rotation of the disc than the rotation fulcrum position where the lower carriage 4 is in contact with the carriage holder 8. Yes, the moment force in the rotation direction 16 of the lower carriage 4 is larger than the moment force in the rotation direction 15 of the upper carriage 3. This difference in moment force is received when the positioning portion 12 formed on the lower carriage 4 comes into contact with the stopper 11 provided on the carriage holder 8, and the head stops at the recording / reproducing position. As a result, the lower head height can be stabilized, and good recording and reproduction can be realized.
[0013]
In the state of the disk insertion / extraction position, as shown in FIG. 2, the upper carriage 3 is arranged in the direction of rotation opposite to the urging direction of the head load spring 21 by a mechanism (not shown) and is arranged on the upper carriage 3 in the rotation direction 13. 9 is pushed up, and the lower carriage 4 is similarly pushed in a direction opposite to the biasing direction of the head load spring 21 by a mechanism (not shown) to push down the pressing portion 10 disposed on the lower carriage 4 in the rotating direction 14. Both carriages rotate in opposite directions so as to secure a gap between the cartridge 20 and the upper and lower heads 1 and 2 and are stopped by a stationary mechanism (not shown). In this state, the disk cartridge 20 is inserted and removed.
[0014]
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 as described above, and are similarly fixed to the carriage holder 8 via the upper and lower suspensions 5 and 6. The pivot points of the upper and lower carriages are similarly provided at the contact portions 22 and 23 with the carriage holder 8, respectively. In the above-described embodiment, the moment force difference is generated by shifting the fulcrum position of the rotational moment force up and down. In this case, the fulcrum position is the same in the vertical direction and the force point position of the head load spring 21 is increased. By shifting the force point 25 of the lower carriage 4 toward the center of the disk with respect to the force point 24 of the carriage 3, a moment force in the rotation direction 16 is generated larger than that in the rotation direction 15. As a result, the upper and lower carriages rotate in the rotation direction 16, and similarly, the lower carriage positioning portion 12 abuts against the stopper 11 disposed on the carriage holder 8 to ensure the stability of the head height position.
[0015]
Further, when the two methods of shifting the fulcrum position of the embodiment described in FIG. 2 up and down and the method of shifting the force point position of the embodiment described in FIG. 3 simultaneously are configured, the rotational moment force is further increased. Thus, a more stable head height can be ensured.
[0016]
【The invention's effect】
As described above, according to the present invention, the first carriage mounted with the upper head and the second carriage mounted with the lower head are realized by sharing the force for clamping the disk with one urging member. As a result, the structure is simplified, and the cost of parts and assembly are greatly reduced. Further, since the space above the upper carriage and the lower part of the lower carriage is not required, it is possible to reduce the thickness of the disk recording / reproducing apparatus.
[0017]
Since the pivot point of the first carriage is located closer to the center of the disc than the pivot point of the second carriage, the moment of rotation is generated in one direction to stabilize the lower head position. It is possible to ensure stable quality.
[0018]
The position of the force point received from the urging member of the second carriage is located closer to the center of the disk than the position of the force point of the first carriage, so that a rotational moment force is generated in one direction to stabilize the lower head position. It is possible to secure stable quality. Further, since the rotation fulcrum positions coincide with each other vertically, the distance from the heads of the first and second carriages can be shortened, and the depth dimension of the disk recording / reproducing apparatus can be further shortened.
[0019]
The pivot point position of the first carriage is disposed closer to the disc center than the pivot point position of the second carriage, and the force point position received from the biasing member of the second carriage is the first carriage point. By being arranged closer to the center of the disk than the position of the power point, it is possible to generate a rotational moment force that is much stronger than that of the above method, and the weight of the first carriage and the second carriage is relatively large. In the case where the center of gravity of both of them is located closer to the point of action, it is possible to further improve the vibration resistance and impact resistance performance, etc. The practical effect of is extremely large.
[Brief description of the drawings]
FIG. 1 is a side view of an essential part showing a disk cartridge mounted state of a disk recording / reproducing apparatus of the present invention.
FIG. 2 is a side view of the main part showing a disk cartridge insertion / extraction state of the disk recording / reproducing apparatus of the present invention.
FIG. 3 is a side view of a main part of a disc showing another embodiment of the disc recording / reproducing apparatus of the present invention and showing a disc cartridge mounted state;
FIG. 4 is a side view of a main part showing a disk cartridge mounted state of a conventional disk recording / reproducing apparatus.
FIG. 5 is a side view of a main part showing a disk cartridge insertion / extraction state of a conventional disk recording / reproducing apparatus.
[Explanation of symbols]
3 Upper carriage 4 Lower carriage 20 Disc cartridge 20a Disc 21 Head load spring

Claims (2)

Two heads that are rotated by a rotary drive device, have a plurality of recording tracks concentrically from the center of rotation, are housed in a hard case, and record and reproduce information on a disc that can be inserted and removed. The first head for recording / reproducing on the upper surface of the disk is mounted and supported by an elastic member, and the second head for recording / reproducing on the lower surface of the disk is mounted and elastic. In a disk recording / reproducing apparatus that constitutes a second carriage supported via a member,
A mechanism for rotating both the first carriage and the second carriage in a direction to sandwich the disk when the disk is moved from the insertion / extraction position to the recording / reproducing position;
The force for sandwiching the disk between the first carriage and the second carriage is shared by one urging member,
As moment force in the rotational direction generated in the second carriage by the biasing member is greater than the moment force in the rotational direction generated in the first carriage by the biasing member, the first The rotation fulcrum position of the carriage is disposed closer to the center of the disk than the rotation fulcrum position of the second carriage, and is received from the rotation fulcrum position of the second carriage and the biasing member of the second carriage. The distance from the force point position is configured to be longer than the distance between the rotation fulcrum position of the first carriage and the force point position of the first carriage ,
2. A disc recording / reproducing apparatus, wherein the second carriage is positioned in a rotational direction by contacting a stopper at a recording / reproducing position of the disc. Two heads that are rotated by a rotary drive device, have a plurality of recording tracks concentrically from the center of rotation, are stored in a hard case, and record and reproduce information on a disc that can be inserted and removed. The first head for recording / reproducing on the upper surface of the disk is mounted and supported by an elastic member, and the second head for recording / reproducing on the lower surface of the disk is mounted and elastic. In a disk recording / reproducing apparatus that constitutes a second carriage supported via a member,
  A mechanism for rotating both the first carriage and the second carriage in a direction to sandwich the disk when the disk is moved from the insertion / extraction position to the recording / reproducing position;
  The force for sandwiching the disk between the first carriage and the second carriage is shared by one urging member,
The moment force in the rotational direction generated in the second carriage by the biasing member is greater than the moment force in the rotational direction generated in the first carriage by the biasing member,
At the recording / reproducing position of the disc, the second carriage is positioned in the rotational direction by contacting the stopper,
A disk recording / reproducing apparatus, wherein the position of a force point received from the biasing member of the second carriage is arranged closer to the center of the disk than the position of the force point of the first carriage.

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