Dynamic information storage or retrieval – With particular cabinet structure – With mechanism to place disc on a turntable
Reexamination Certificate
2001-02-28
2002-11-12
Nguyen, Hoa T. (Department: 2652)
Dynamic information storage or retrieval
With particular cabinet structure
With mechanism to place disc on a turntable
Reexamination Certificate
active
06480453
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for driving an optical disc, in which information is recorded and/or reproduced on/from an optical disc by optical means, and more particularly, to an apparatus for driving an optical disc and a method thereof which employs a manual-type disc loading structure.
2. Description of the Related Art
Generally, an optical disc driving apparatus includes a deck base, loading/unloading means, a rotation means, and recording/reproducing means. The deck base forms a body of the optical disc driving apparatus. The loading/unloading means loads or unloads the optical disc onto/from the deck base. The rotation means rotates the optical disc loaded by the loading/unloading means. The recording/reproducing means records and/or reproduces information on/from the optical disc, while traveling in a radial direction of the optical disc which is rotated by the rotation means. Here, the optical disc may be loaded or unloaded while mounted on a tray. There are various types of optical disc driving apparatuses such as one having the optical disc received into a caddy or a cartridge to be inserted or withdrawn into/from the deck base, etc. A spindle motor is generally used as the rotation means, and a pickup unit is used as the recording/reproducing means.
FIG. 1
shows a conventional tray-type optical disc driving apparatus. As shown in
FIG. 1
, the optical disc driving apparatus includes a deck base
1
, a base plate
10
on which the spindle motor and pickup unit are mounted, a tray
20
on which an optical disc D is mounted, tray moving means
30
, base plate raising and lowering means
40
, and an upper cover
50
.
The deck base
1
is provided with a pair of sidewalls
2
and
3
, a rear wall
4
, and a front bottom
5
which has a predetermined width. A pair of holes
6
a
and
6
b
are defined at a rear portion of the sidewalls
2
and
3
.
The base plate
10
has a pair of hinge projections
11
a
and
11
b
formed at both rear ends thereof, respectively. The base plate
10
is movably mounted on the deck base
1
by the hinge projections
11
a
and
11
b
which are respectively inserted into the holes
6
a
and
6
b
of the deck base
1
. A spindle motor
12
and a pickup unit
13
are mounted on the base plate
10
. The spindle motor
12
has a turntable
12
a
onto which a disc D is positioned. The pickup unit
13
has an optical head
13
a
. The spindle motor
12
is attached on the base plate
10
and adjacent to a longitudinal opening
10
a
of the base plate
10
, and the pickup unit
13
is movably disposed at a pair of guiding shafts
14
a
and
14
b
which lie across the longitudinal opening
10
a
in parallel relation to each other. Additionally, a stepping motor
15
is installed at a side of the base plate
10
, and a lead screw
15
a
is installed at the stepping motor
15
in parallel relation to the guiding shafts
14
a
and
14
b
. The lead screw
15
a
is engaged with a guiding holder
13
b
which is formed at a side of the pickup unit
13
. Accordingly, when the stepping motor
15
is rotated in one direction and a reverse direction thereof, the pickup unit
13
is moved along the guiding shafts
14
a
and
14
b.
The tray
20
is disposed on an upper side of the deck base
1
and is capable of being inserted and withdrawn with respect to the deck base
1
. A receiving opening
20
a
is defined approximately at the middle portion of the tray
20
to receive the spindle motor
12
, and a longitudinal opening
20
b
is so designed as to intercommunicate with the receiving hole
20
a
and to expose the recordable surface of the optical disc D mounted on the tray
20
to the pickup unit
13
. Additionally, a rack gear
21
is disposed on a lower surface of the tray
20
in a lengthwise direction of the tray
20
, and an operation member
22
having a cam groove is disposed adjacent to the receiving opening
20
a.
The tray moving means
30
is provided on the bottom
5
of the deck base
1
, and the base plate raising and lowering means
40
is such constructed to operate together with the tray moving means
30
.
The tray moving means
30
is provided with the rack gear
21
disposed on the tray
20
, a pinion
31
, and a motor
32
which generates a driving force. The pinion
31
is rotatably disposed on the bottom of the deck base
1
by a shaft. The motor
32
is disposed on a lower surface of the bottom
5
of the deck base
1
and a driving shaft of the motor
32
protrudes upward through the bottom
5
of the deck base
1
. The driving force of the motor
32
is transmitted to the pinion
31
via gear train
33
. The gear train
33
has a first gear
33
a
fixed to the driving shaft of the motor
32
, a second gear
33
b
engaged with the first gear
33
a
, a third gear
33
c
integrally formed with the second gear
33
b
, a fourth gear
33
d
engaged with the third gear
33
c
, a fifth gear
33
e
integrally formed with the fourth gear
33
d
, and a sixth gear
33
f
integrally formed with the pinion
31
to be engaged with the fifth gear
33
e
. Here, when the motor
32
is rotated in the clockwise direction, the tray
20
is advanced so as to be inserted into the deck base
1
. When the motor
32
is rotated in the counterclockwise direction, the tray
20
is retracted so as to be withdrawn from the deck base
1
.
The base plate raising and lowering means
40
has a slide member
41
and a pivot lever
42
. The slide member
41
is disposed in an inner side of the bottom
5
of the deck base
1
so as to be moved in perpendicular relation to the direction which the tray
20
is moved toward. The pivot lever
42
is disposed on the bottom
5
of the deck base
1
by a shaft, while connected to an end of the slide member
41
.
A pair of cam grooves
41
a
and
41
b
are defined at a side surface of the slide member
41
. A pair of operation projections
16
a
and
16
b
are projected from the front surface of the base plate
10
while being spaced from each other at a predetermined distance. The operation projections
16
a
and
16
b
are inserted into the cam grooves
41
a
and
41
b
. Additionally, a rack
41
c
is formed at the other side of the slide member
41
. The rack
41
c
is selectively engaged with the sixth gear
33
f
of the gear train
33
. Accordingly, when the sixth gear
33
f
is rotated in one direction and the reverse direction thereof and is engaged with the rack
41
c
, the slide member
41
is moved. Initially, when the tray
20
is not inserted into the deck base
1
, the rack
41
c
is not engaged with the sixth gear
33
f
, but spaced therefrom by a predetermined distance.
Further, a projection
41
d
is formed on an upper portion of the slide member
41
. When the tray
20
is inserted into the deck base
1
, the projection
41
d
is inserted into the cam groove of the operation member
22
which is formed on the tray
20
. Due to the projection
41
d
being inserted into the cam groove of the operation member
22
, the slide member
41
is slightly moved when the tray
20
is inserted. Accordingly, the rack
41
c
of the slide member
41
is engaged with the sixth gear
33
f
, and as the sixth gear
33
f
is rotated, the slide member
41
is continuously moved. Due to the slide member
41
being moved, the operation projections
16
a
and
16
b
of the base plate
10
, which are positioned at a lower portion of the cam grooves
41
a
and
41
b
, are raised along the inclined surfaces of the cam grooves
41
a
and
41
b
to be positioned at the upper ends of the cam grooves
41
a
and
41
b
. By the rising motion of the base plate
10
, the optical disc D mounted on the tray
20
is put on the turntable
12
a
of the spindle motor
12
to be rotated by the turntable
12
a.
Meanwhile, the pivot lever
42
has a slider
43
which is inserted into a boss
41
e
of the slide member
41
. The slider
43
is accommodated at an opening of the pivot lever
42
. A spring
44
for elastically supporting the slider
43
is disposed in the opening. Due t
Samsung Electronics Co,. Ltd.
Staas & Halsey , LLP
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