Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2001-11-28
2004-04-13
Edun, Muhammad (Department: 2655)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S047100, C369S047280, C369S124010
Reexamination Certificate
active
06721250
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a disk playback device for playing back information recorded on a disk such as a CD-ROM and, more particularly, to control over a rotation speed of a disk.
BACKGROUND ART
In recent years, the playback speed of the disk playback device such as a CD-ROM device has kept on increasing and, with this speeding-up, the disk rotation speed has also kept on increasing.
However, the increases in the disk rotation speed adversely cause vibrations or noises in the drive. More particularly, in media-exchangeable CD-ROM devices, DVD-ROM devices or the like, there are variations in mass eccentricities of media and the like, and accordingly excessive vibrations or noises sometimes occur depending on used media.
Thus, in recent years, it is common that when vibrations over a prescribed level occur, the maximum rotation speed of a disk is automatically reduced by a method in which a vibration sensor is mounted on a drive or vibrations are detected from a servo error signal or the like, thereby reducing the vibrations.
However, the vibrations and noises depend on users' senses, and the extents to which the users feel unpleasant differ according to the use environments, users' individual differences or the like. Further, there are certain variations in a vibration sensor mounted on a drive or a detection signal from a servo error signal for detecting vibrations, and the disk rotation speed is sometimes reduced though the user actually feels that the level is trivial.
Accordingly, as a device which arbitrarily reduces the disk rotation speed in accordance with an operation of a user who feels unpleasant, a disk playback device which can reduce the disk rotation speed by performing a prescribed operation to a disk ejection switch which is attached to the device is commercially available.
Hereinafter, this conventional disk playback device
61
which reduces the disk rotation speed using a disk ejection switch will be described with reference to FIG.
6
.
FIG. 6
is a diagram for explaining the conventional disk playback device.
In
FIG. 6
, reference numeral
61
denotes a disk playback device according to this prior art. Numeral
12
denotes a host computer which issues a data playback request or the like to the disk playback device
61
as well as receives data which has been played back by the disk playback device
61
.
Next, the structure of the disk playback device
61
will be described.
Numeral
101
denotes a disk on which various kinds of information data is recorded and which is exchangeably disposed. Numeral
102
denotes a disk motor for rotating the disk
101
. Numeral
103
denotes a disk motor driving means for driving the disk motor
102
at a predetermined rotation speed. Numeral
104
denotes a playback means for playing back the various kinds of information data which is recorded on the disk
101
. Numeral
105
denotes a volume control for adjusting an output level of an audio signal by a user operation. Numeral
106
denotes an audio output means for outputting audio data which has been played back by the playback means
104
as an audio signal. Numeral
107
denotes an interface means, which is connected with the host computer
12
, for receiving the data playback request or the like from the host computer
12
as well as outputting data such as a program which has been played back by the playback means
104
. Numeral
1003
denotes a disk ejection means for stopping the rotation of the disk
101
and ejecting the disk
101
from the disk playback device
61
. Numeral
1004
denotes a disk ejection switch for outputting a switch operation which has been performed by a user. Numeral
110
denotes a control means for controlling respective components of the disk playback device
61
. The control means
110
includes a switch operation analysis means
1001
for analyzing the switch operation of the disk ejection switch
1004
, which has been performed by the user, and outputting a disk ejection command or a disk rotation speed control command; and a rotation speed control means
1002
for controlling the rotation speed of the disk
101
on the basis of a signal outputted from the switch operation analysis means
1001
.
Next, control over the rotation speed of the disk
101
using the conventional disk playback device
61
will be described.
When a user operates the disk ejection switch
1004
, the switch operation analysis means
1001
included in the control means
110
analyzes the operation of the disk ejection switch
1004
by the user. When the normal operation (for example, operation such as pushing the disk ejection switch
1004
once) is performed, the switch operation analysis means
1001
outputs a disk ejection command to the disk ejection means
1003
, to stop the rotation of the disk
101
and eject the disk
101
outside of the device. On the other hand, when a specific operation (for example, operation such as continuing to press the disk ejection switch
1004
for a prescribed time or longer period) is performed, the switch operation analysis means
1001
outputs a command for reducing the rotation speed of the disk motor
102
to the rotation speed control means
1002
, to reduce the rotation speed of the disk
101
. To be more specific, when the user feels unpleasant due to vibrations or noises of the disk playback device
61
, which result from the mass eccentricity of the disk
101
or the like, the user performs a specific operation using the disk ejection switch
1004
to output a command for reducing the rotation speed of the disk
101
to the rotation speed control means
1002
. The rotation speed control means
1002
which has received the command for reducing the disk rotation speed controls the disk motor driving means
103
to reduce the rotation speed of the disk motor
102
, thereby reducing noises or vibrations.
However, in the above-mentioned conventional disk playback device, a specific operation that is not the normal operation for disk ejection is performed to the disk ejection switch
1004
to reduce the rotation speed of the disk. Accordingly, there is a high risk of erroneous operations of the disk ejection switch
1004
. Further, it is quite difficult to minutely set the degree of reducing the disk rotation speed, or restore the playback speed which has been once reduced to its previous speed. When this is to be realized, a complicated operation of the disk ejection switch
1004
by the user is further required, whereby the risk of erroneous operations of the switch is increased.
The present invention is made in view of the aforementioned problems and has for its object to provide a disk playback device which neither requires an additional component in the disk playback device nor affects a disk reading operation even when an erroneous operation is performed, and whose disk rotation speed can be arbitrarily changed by the user with a simple operation.
DISCLOSURE OF THE INVENTION
To attain the aforementioned object, a disk playback device according to an embodiment of the present invention comprises: a playback means for playing back data on a disk; an audio output means for outputting audio data as an audio signal to the outside when the audio data is played back by the playback means; an audio level manipulation means for manipulating an output level of the audio signal which is outputted by the audio output means; a detection means for detecting a set value of the audio level manipulation means; and a rotation speed control means for controlling a rotation speed of the disk which is played back by the playback means, and the rotation speed control means controls the rotation speed of the disk on the basis of the set value detected by the detection means.
According to the disk playback device of the present invention, the rotation speed is controlled on the basis of the set value in the audio level manipulation means, whereby the users can freely change the disk rotation speed with a simple operation. Further, the rotation speed of the disk is controlled using the audio level manip
Edun Muhammad
Wenderoth Lind & Ponack LLP
LandOfFree
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