Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Reexamination Certificate
2001-04-05
2004-10-12
Neyzari, Ali (Department: 2655)
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
C369S075210
Reexamination Certificate
active
06804174
ABSTRACT:
TECHNICAL FIELD
This invention relates to a recording and/or reproducing apparatus for a magneto-optical disc. Specifically, this invention relates to a recording and/or reproducing apparatus for a magneto-optical disc, which is provided with a magnetic head for supplying external magnetic field to the magneto-optical disc.
BACKGROUND ART
In a recording apparatus for magneto-optical disc for carrying out recording of information with respect to the magneto-optical disc, there is required a magnetic head for supplying external magnetic field to the magneto-optical disc caused to be in contact with or become close to the surface of the opposite side of laser beam irradiation surface of the magneto-optical disc.
The magnetic head is spaced from the magneto-optical disc at the time except for the time of recording of the magneto-optical disc, and is caused to be in contact with or become close to the magneto-optical disc only at the time of recording. For this reason, it is necessary to move the magnetic head between the recording position caused to be in contact with or become close to the magneto-optical disc and the non-recording position spaced from the magneto-optical disc.
In the prior art, as mechanism for moving the magnetic head for the above-described object, there is provided a mechanism as shown in FIG.
1
.
At a top plate of holder (not shown) for holding disc cartridge adapted so that magneto-optical disc is rotatably accommodated within cartridge case which is a square flat casing and moved between fitting position at which this disc cartridge is fitted at a predetermined disc fitting portion and the eject position at which insertion/withdrawal of the disc cartridge is carried out, there is formed a large hole for facing the upper surface of the disc cartridge toward the upper portion.
As shown in
FIG. 1
, a magnetic head unit
101
is connected to optical pick-up (not shown) through a connection member
106
, and is adapted so that it is moved in left and right directions, i.e., in the direction indicated by arrow A in
FIG. 1
together with the optical pick-up.
The magnetic head unit
101
is provided at the front end side thereof with a head supporting arm
103
which supports a magnetic head
102
and an arm supporting plate
104
for regulating excessive displacement of this head supporting arm
103
.
The head supporting arm
103
is formed by punching thin metal plate having elasticity, e.g., phosphor bronze, etc. The arm supporting plate
104
is adapted so that a front end portion
105
bent L-shaped supports the lower surface of the front end side of the head supporting arm
103
, and bottom end portions of this arm supporting plate
104
and the head supporting arm
103
are both fixed and supported at the upper end portion of the channel-shaped connection member
106
.
The magnetic head
102
is upwardly and downwardly moved by a head shift plate
107
. The head shift plate
107
takes substantially square plate shape, wherein the back end portion is rotatably supported also in both upper and lower directions in the vicinity of the back end portion of the hole of the holder.
At the head shift plate
107
, a driven piece
108
is provided in a projected manner (hereinafter simply referred to as projected as occasion may demand) at one side edge and a spring contact piece
109
is projected at the other side edge.
A return spring
110
consisting of plate spring material is adapted so that one end is fixed at the top plate of the holder and the other end is caused to be in contact with the spring contact piece
109
of the head sift plate
107
from the upper side to downwardly bias the head shift plate
107
. The driven piece
108
of the head shift plate
107
is positioned at the upper side of a cam piece
112
of a head vertical movement lever
111
rotatably supported at the top plate of the holder. This cam piece
112
is adapted so that falling portion is formed at the back end portion and rising portion is formed at the front end portion and the portion between these falling and rising portions is connected by slating side portion. The state shown in
FIG. 1
indicates the state where the driven piece
108
is mounted on the falling portion of the cam piece
112
. In this state, the head shift plate
107
is rotated downwardly. As a result, there results the state where the magnetic head unit
101
is downwardly rotated and the magnetic head
102
is in contact with the magneto-optical disc
1
supported by the holder.
At chassis (not shown) on which the holder is supported, a vertical movement control plate
113
is movably supported in forward and backward directions, i.e., in the direction indicated by arrow B (forward direction) and in the direction indicated by arrow C (backward direction) in the figure. At the vertical movement control plate
113
, a rack
114
is formed, and this rack
114
is fed by a pinion
116
rotated by a motor
115
so that it is moved in forward and backward directions. At the vertical movement control plate
113
, a connection hole
117
is formed at the back end portion, and a connection piece
118
vertically provided at the other end portion of the head vertical movement lever
111
is inserted through the connection hole
117
.
Accordingly, when the vertical movement control plate
113
is moved in the forward direction, i.e., in the direction indicated by arrow B in
FIG. 1
, the head vertical movement lever
111
is rotated in counterclockwise direction, i.e., in the direction indicated by arrow D in FIG.
1
. In addition, when the vertical movement control plate
113
is moved in backward direction, i.e., in the direction indicated by arrow C in
FIG. 1
, the head vertical movement lever
111
is rotated in the clockwise direction, i.e., in the direction indicated by arrow E in FIG.
1
.
As described above, the state shown in
FIG. 1
is the state at the time of recording, and the vertical movement control plate
113
is placed in the state where it is moved in the direction indicated by arrow C. Thus, the head vertical movement lever
111
is rotated in the clockwise direction, i.e., in the direction indicated by arrow E and the magnetic head
102
is placed in the state where it is positioned lowermost with respect to the holder. In this state, the magnetic head
102
is in contact with the magneto-optical disc
1
.
When recording is completed, the vertical movement control plate
113
is moved in the forward direction, i.e., in the direction indicated by arrow B. Thus, the head vertical movement lever
111
is moved in counterclockwise direction, i.e., in the direction indicated by arrow D. As a result, the cam piece
112
is moved in the backward direction and the driven piece
108
of the head shift plate
107
is placed in the state positioned at rising portion of the cam piece
112
. Thus, the head shift plate
107
is rotated in the supper direction, and the arm supporting plate
104
and the head supporting arm
103
are lifted by this head shift plate
107
in such a manner that they are rotated in upper direction. As a result, the magnetic head
102
is spaced from the magneto-optical disc
1
.
In the above-described conventional recording apparatus for magneto-optical disc, the head vertical movement lever
111
is interposed between the vertical movement control plate
113
and the head shift plate
107
for the purpose of rotating the head shift plate
107
. Thus, the number of parts is large and the connecting portions become many. As a result, in the above-described configuration, there are the problems that there results increased cost, positional accuracy of the connecting portions is difficult to be ensured, transmission efficiency of force is poor and reliability is low. Further, in the recording apparatus for magneto-optical disc shown in
FIG. 1
, there was the problem that members for transmission of force such as vertical movement control plate
113
extending over substantially in forward and backward directions of chassis, connection piece
118
of head vertical movement lever
111
Kurita Kazuhito
Nakamura Tadami
Neyzari Ali
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
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