Dynamic information storage or retrieval – Dynamic mechanism subsystem – Having power driven transducer assembly
Reexamination Certificate
1997-12-31
2001-01-30
Letscher, George J. (Department: 2754)
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Having power driven transducer assembly
Reexamination Certificate
active
06181669
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus for adjusting a tilt of a disc, and more particularly to an apparatus for easily adjusting a tilt of a disc which is loaded on a turn table of a disk recording/reproducing device and rotated at high speed.
2. Description of the Related Art
In general, a disc is used as a recording medium for recording information on, and reproducing information therefrom and leg, spiral or concentric tracks which contain the information. The information recorded on the disc is reproduced using a pick-up feeding means including a motor and a plurality of gear trains which are driven and rotated by the motor, and an optical pick-up device which is linearly moved by the pick-up feeding means in a radial direction of the disc.
A guide device for guiding an optical pick-up device which is moved along the radial direction of a disc D (not shown) is shown in FIG.
1
. The guide device includes two guide shafts
12
and
12
′ which are fixed to a deck base
10
to be parallel with a horizontal axis of the optical pick-up device by bushes
14
. A pick-up base
16
on which the optical pick-up device is mounted, is movably coupled to guide shafts
12
and
12
′.
Supporting members
18
such as bosses and the like, protrude from on upper surface of the deck base
10
to support disc rotating means shown in
FIGS. 1 and 2
for rotating the disc D at a linear velocity. The disc rotaing means includes a turn table
20
on which a nonmagnetic portion of the disc D rests, and a spindle motor
22
rotating shaft. An upper portion of the rotating shaft is coupled to the turn table
20
.
The spindle motor
22
is fixed to a bracket
24
which contacts upper surface of supporting members
18
, and the bracket
24
is fixed to the supporting members
18
by three fixing screws
28
to be spaced apart and fastened to the deck base
10
. The bracket
24
is formed with two position setting holes
24
a
into which position setting pins
10
a
are respectively inserted.
The conventional disc rotating means constructed as above is fixed to the deck base
10
and operates as follows. First, the disc rotating means is mounted to the deck base
10
by which position setting pins
10
a
are inserted into the respective position setting holes
24
a
which protroded from the deck base
10
. Then, the bracket
24
is fixed to the deck base
10
by means of the coupling fixing screws
28
with supporting members
18
. The fixing screws
28
are arranged at a predetermined angle with respect to each other. At this time, the bracket
24
supports the spindle motor
22
and the turn table
20
coupled to the spindle motor
22
by contacting the upper portions the supporting members
18
.
After this, the disc D is loaded on the upper surface of the turn table
20
and is rotatiled at a high velocity by rotating the power of the spindle motor
22
. At the same time, a pick-up base
16
moves in a radial direction of the disc D along the guide shafts
12
,
12
′ which are fixed to be parallel with the horizontal shaft of the optical pick-up device so that the optical pick-up device records the information on recording pits and/or reproduces the information therefrom.
In the conventional disc rotating device, however, since the bracket on which the spindle motor is mounted is fixed to the upper portion of the supporting member using a plurality of fixing screws, the contact are of the supporting members is small so that the supporting members cannot properly horizontally support the bracket. As a result the disc on the turn table is undesirably tilted. Moreover, since there is no a tilt adjusting means for adjusting the radial and tangential tilt of tile disc, the laser beam emitted from the optical pick-up device cannot accurately be focused on the record pits on the disc.
SUMMARY OF THE INVENTION
The present invention has been made to overcome the above described problems of the related art. Accordingly, it is an object of the present invention to provide an apparatus for easily adjusting a radial and a tangential tilt of a turn table and a disc loaded on the turn table, the apparatus being capable of horizontally mounting a disc rotating device on a deck base by means of expanding a supporting area of a bracket.
To accomplish the above and the other objects of the present invention, the present invention provides an apparatus comprising a deck base having a loading ring, a bracket formed with a slot, the bracket including a spindle motor for rotating tile disc and a turn table on which the disc is loaded, a supporting part disposed between the loading ring and the bracket for horizontally supporting the disc and the turn table by supporting the bracket, and a tilt adjusting part rotatably mounted to the deck base for adjusting a tilt of the disc.
According to an embodiment of the present invention, the supporting part includes a contacting portion for contacting the loading rin and a placing portion on which the bracket is placed the contacting portion having a semispherical shape and being integrally formed with the placing portion.
Moreover, the tilt adjusting part includes a tilt cam rotatably mounted to the deck base for adjusting a first directional tilt of the disc, and in eccentric cam rotatably mounted to the deck base for adjusting a second directional tilt of the disc, the tilt cam having an inclined surface formed at upper end thereof an upper portion the eccentric cam penetrating through the slot and contacting the slot.
There are some advantages when the bracket is horizontally supported to the deck base by increasing a supporting area of the cams. The radial and tangential tilts generated by inclination of the turn table and the disc can be easily adjusted.
REFERENCES:
patent: 3927252 (1975-12-01), Polley
patent: 4506857 (1985-03-01), Hara et al.
patent: 5347507 (1994-09-01), Kuhn
patent: 6005836 (1999-12-01), Choi
patent: 2085635 (1982-04-01), None
patent: 10-134359 (1998-05-01), None
Letscher George J.
Samsung Electronics Co,. Ltd.
Staas & Halsey , LLP
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