Dynamic optical information storage or retrieval – Particular cabinet structure for optical media – Details of exterior front face
Reexamination Certificate
2001-09-21
2004-11-16
Chen, Tianjie (Department: 2652)
Dynamic optical information storage or retrieval
Particular cabinet structure for optical media
Details of exterior front face
Reexamination Certificate
active
06820274
ABSTRACT:
TECHNICAL FIELD
This invention relates to a recording and/or reproducing device which uses a magneto-optical disc as a recording medium, and particularly to a magneto-optical disc recording and/or reproducing device which enables miniaturization by realizing effective use of the space and realizes simplification of the mechanism.
BACKGROUND ART
As a magneto-optical disc recording/reproducing device which uses a magneto-optical disc as a recording medium, a device constituted as shown in
FIGS. 1 and 2
is conventionally used. In this recording/reproducing device, a rotational driving section
103
for rotationally driving a magneto-optical disc is provided substantially in a center portion of a flat plate-like base
102
arranged inside a device body
101
, as shown in FIG.
1
. In a portion of the base
102
which extends to one lateral edge from the portion where the rotational driving section
103
is provided, an optical pickup
104
is arranged so as to move away from the rotational driving section
103
.
A head attachment arm
105
is arranged on the upper side of a holder provided on the base
102
. A magnetic head
106
is attached at the distal end of the head attachment arm
105
. The head attachment arm
105
is connected with the optical pickup
104
via a connection member
107
so as to move synchronously with the movement of the optical pickup
104
.
On the surface of the side of the base
102
where the holder is provided, an ejection lever
108
for ejecting a disc cartridge held by the holder is provided. The ejection lever
108
is provided at a position on the opposite side to the portion where the optical pickup
104
is provided, with the rotational driving section
103
provided between them, as shown in FIG.
1
.
In the recording/reproducing device shown in
FIG. 1
, a battery housing section
110
for housing a battery
109
is provided inside the device body
101
. The battery housing section
110
is provided on the back side of the base
102
where the ejection lever
108
is arranged.
Meanwhile, if miniaturization of the magneto-optical disc recording/reproducing device is to be realized, the housing position of the battery
109
must be considered. For example, for realizing the miniaturization of the recording/reproducing device, it may be considered to arrange the battery housing section
110
at a position facing the optical pickup
104
so that the rotational driving section
103
provided between them, as shown in FIG.
3
. If the battery housing section
110
is arranged in this manner, the ejection lever
108
used in the device shown in
FIG. 1
cannot be arranged.
Thus, it may be considered to provide the ejection lever
108
on the side where the optical pickup
104
is arranged. If the ejection lever
108
is arranged in this manner, there is a risk that the ejection lever
108
may interfere with the connection member
107
. To avoid this interference, the connection member
107
must be allowed to escape toward the rear side of the base
102
and the device itself is increased in size for that space.
In the recording/reproducing device using a magneto-optical disc as a recording medium, the optical pickup and the magnetic head are arranged so that the magneto-optical disc is provided between them. The magnetic head is arranged to be in contact with or close to the surface of the magneto-optical disc that is opposite to the surface irradiated with a light beam emitted from the optical pickup.
The magnetic head used in the magneto-optical disc recording/reproducing device is moved to a position in contact with or close to the magneto-optical disc only at the time of recording, and is moved to a position away from the magneto-optical disc at the time of reproduction. This is to prevent the magnetic head and the magneto-optical disc from constantly contacting each other so as to protect the magnetic head and the magneto-optical disc.
Thus, in the magneto-optical disc recording/reproducing device, a head lift mechanism as shown in
FIG. 4
is provided for moving the magnetic head toward and away from the magneto-optical disc.
The magneto-optical disc recording/reproducing device having the head lift mechanism will now be described. This device has a holder
123
which holds a disc cartridge constituted by a rectangular cartridge body with a magneto-optical disc
121
housed therein and which is arranged movably between a first position for loading the disc cartridge at a disc loading position formed on a base
122
and a second position for carrying out loading and release of the disc cartridge, as shown in FIG.
4
.
A magnetic head unit
125
moving toward and away from the magneto-optical disc
121
housed in the disc cartridge is connected to an optical pickup, not shown, via a connection member
126
, and is supported to be movable synchronously with the optical pickup in the direction of an arrow X in
FIG. 4
, which is the radial direction of the magneto-optical disc
121
. The magnetic head unit
125
has ahead support arm
128
supporting a magnetic head
127
at the distal end, and an arm support plate
129
for regulating excessive displacement of the head support arm
128
. The head support arm
128
is formed by punching out an elastic thin metal plate such as phosphor bronze. A distal end portion
129
a
bent into an L-shape, of the arm support plate
129
, supports the lower surface on the distal end side of the head support arm
128
, and the proximal end portions of the arm support plate
129
and the head support arm
128
are fixed and supported on a U-shaped upper end portion of the connection member
126
.
The magnetic head
127
is raised and lowered by a head shift plate
130
. The head shift plate
130
is formed in a substantially rectangular plate shape and has its rear end portion supported in a vertically rotatable manner near a rear end portion of an aperture
123
a
provided in the holder
123
. On the head shift plate
130
, a driven piece
131
protruding from one lateral edge of the head shift plate
130
and a spring abutment piece
132
protruding the other lateral edge are provided. The head shift plate
130
is pressured and supported downward on the side of the holder
123
by a return spring
133
. The return spring
133
has its one end fixed to the top plate of the holder
123
and its other end pressures the spring abutment piece
132
of the head shift plate
130
from above, thus biasing the head shift plate
130
downward. The driven piece
131
of the head shift plate
130
is located above a cam piece
136
of a head lift lever
135
which is rotatably supported to the top plate of the holder
123
. The cam piece
136
has a lowering portion formed at the rear end and a rising portion formed at the front end, and the lowering portion and the rising portion are connected by a sloped portion.
FIG. 4
shows the state where the driven piece
131
is set on the lowering portion of the cam piece
136
in the magneto-optical disc recording/reproducing device. In the state shown in
FIG. 4
, the head shift plate
130
is rotated downward, the magnetic head unit
125
is rotated downward, and the magnetic head
127
is moved to a position in contact with or close to the magneto-optical disc
121
housed in the disc cartridge held by the holder
123
.
On the base
122
on which the holder
123
holding the disc cartridge inserted therein is rotatably supported, a lift control plate
137
is supported to be movable in the back-and-forth direction, that is, forward in the direction of an arrow Y and backward in the direction of an arrow Z in
FIG. 4. A
rack
138
is formed on the lift control plate
137
. The rack
138
is moved and operated in the back-and-forth direction via a connection gear mechanism
142
rotated by a driving motor
141
. A connection hole
143
is formed at the rear end portion of the lift control plate
137
. In the connection hole
143
, a connection piece
144
provided at the other end of the head lift lever
135
is inserted.
If the lift control plate
137
moves forward in th
Kurita Kazuhito
Minowa Satoru
Nakamura Tadami
Takamatsu Takashi
Tamura Kenichi
Chen Tianjie
Maioli Jay H.
Sony Corporation
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