Electronic apparatus

Details Electronic apparatus Electronic apparatus

1999-05-13

2001-09-25

Ometz, David L. (Department: 2652)

Dynamic information storage or retrieval

With particular cabinet structure

C381S336000

Reexamination Certificate

active

06295263

ABSTRACT:

TECHNICAL FIELD
The present invention relates to an electronic apparatus for use in recording and/or playing back audio or video signals and more particularly, to an electronic apparatus in which excessive vibration caused by resonance on its circuit board which constitutes a signal processor and is mounted in a housing of the apparatus can be prevented.
BACKGROUND ART
A disk playback apparatus using a disk recording medium has been known as such an electronic apparatus for recording and/or playing back an audio signal and a video signal.
As shown in
FIGS. 1 and 2
, such a known disk playback apparatus
100
has a housing
101
serving as a main body thereof The housing
101
has a rectangular block shape comprising a top panel
102
forming the top side thereof, a bottom panel
103
forming the bottom side thereof, a front panel
104
forming the front side thereof, a back panel
105
forming the back side thereof, and two, left and right, side panels
106
and
107
forming the left and right sides thereof More particularly, the housing
101
is shaped by assembling with any two opposite sides arranged parallel to each other; the top panel
102
and the bottom panel
103
, the front panel
104
and the back panel
105
, and the left panel
106
and the right panel
107
.
A support leg
108
made of a vibration absorbing material such as rubber is mounted to each corner of the bottom panel
103
of the housing
101
. The housing
101
is placed with its support legs
108
directly on a platform
109
such as a table or a bed.
A first circuit board
111
and a second circuit board
112
serving as a playback unit and a signal processor of the disk playback apparatus
100
are installed in the housing
101
. The circuit boards
111
and
112
are shaped of a flat sheet-like form which is made of a synthetic resin material having a degree of rigidity and located in the housing
101
so as to extend in parallel to both the top panel
102
and the bottom panel
103
.
Also, a disk rotating mechanism
113
for rotating the recording medium or an optical disk
99
of the disk playback apparatus
100
is mounted in the housing
101
. The disk rotating mechanism
113
has a spindle motor
114
and a disk table
116
mounted to the distal end of a spindle
115
of the spindle motor
114
, as shown in FIG.
1
. The disk rotating mechanism
113
is secured with its spindle motor
114
fixedly joined to a base
117
in the housing
101
. In particular, the spindle motor
114
is anchored to the base
117
so that its spindle
115
extends vertical to the top panel
102
and the bottom panel
103
which are arranged parallel to each other. The disk table
116
on which the optical disk
99
is loaded is mounted to the distal end of the spindle
115
so that its optical disk
99
loading surface is vertical to the spindle
115
and it can rotate together with the optical disk
99
.
Since the loading surface of the disk table
116
extends vertical to the spindle
115
, the optical disk
99
when loaded on the disk table
116
is supported at its main side parallel to the top panel
102
and the bottom panel
103
.
As not shown, a loudspeaker unit for playing back the audio signal read out from the optical disk
99
to emit acoustic sound is also installed in the housing
101
.
The disk playback apparatus
100
having the foregoing arrangement is placed with its support legs
108
, mounted to the bottom panel
103
of the housing
101
, directly on the platform
109
and during the playback action, its housing
101
receives external acoustic power or vibration from the platform
109
or the ambient space. The vibration received from the platform
109
may be attenuated by the support legs
108
made of the vibration absorbing material and prevented from direct propagation to the housing
101
itself and the inside of the housing
101
. However, the external acoustic power or vibration from the ambient space is directly transmitted to the housing
101
of the apparatus and produces a significant of vibration on the housing
101
.
Also, the disk rotating mechanism
113
in the disk playback apparatus
100
generates vibration when it starts driving. The vibration from the disk rotating mechanism
113
is transmitted via the base
117
to and vibrates the first circuit board
111
and the second circuit board
112
. Moreover, the sound emitted from the loudspeaker unit propagates to and vibrates the first circuit board
111
and the second circuit board
112
.
In the conventional disk playback apparatus
100
as an electronic apparatus, the top panel
102
and the bottom panel
103
of the housing
101
facing each other extend parallel to each other while the first
111
and the second circuit board
112
in the housing
101
are arranged parallel to both the top panel
102
and the bottom panel
103
. This causes the vibration generated on the top panel
102
, the bottom panel
103
, and the two circuit boards
111
and
112
to repeat reflection between the top panel
102
and the first circuit board
111
, between the bottom panel
103
and the second circuit board
112
, and between the first circuit board
111
and the second circuit board
112
, as denoted by the arrow in
FIG. 1
, thus creating unwanted resonance between the top panel
102
and each of the two circuit boards
111
and
112
and between the bottom panel
103
and each of the two circuit boards
111
and
112
. The resonance will then trigger excessive vibration on the top panel
102
, the bottom panel
103
, and the first circuit board
111
and the second circuit board
112
of which the amplitude is greater than that of the original vibration generated in the housing
101
or of the external vibration introduced to the housing
101
.
The support legs
108
of the disk playback apparatus
100
are identical in height. While the disk playback apparatus
100
is placed with its support legs
108
directly on the platform
109
, its bottom panel
103
becomes parallel to the platform
109
. This causes the vibration derived from the bottom panel
103
or the platform
109
to repeat reflection between the bottom panel
103
and the platform
109
, as denoted by the arrow in
FIG. 1
, hence creating a significant resonance between the bottom panel
103
and the platform
109
. Accordingly, the resonance will trigger excessive vibration on the bottom panel
103
of which the amplitude is greater than that of the external vibration introduced to the bottom panel
103
. The excessive vibration on the bottom panel
103
repeats reflection between the first circuit board
111
and the second circuit board
112
and produces greater resonance which then vibrates the two circuit boards
111
and
112
to a higher amplitude.
The excessive vibration on the two circuit boards
111
and
112
and thus electronic components of the circuit boards
111
and
112
impairs the action of the signal processor unit on the circuit boards
111
and
112
. Particularly in the disk playback apparatus as an electronic apparatus, the audio or video signal read out from an optical disk may be added with unwanted noise components caused by the vibration and its properties will be declined in the playback.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide an electronic apparatus capable of recording and/or playing back audio signals and video signals while preventing the declination of the recording and/or playback properties of the signals.
It is another object of the present invention to provide a novel electronic apparatus which receives no effect of the vibration introduced from outside.
It is a further object of the present invention to provide an electronic apparatus which is improved in selecting the materials of a housing and circuit boards without limitations in order to avoid the effect of vibration introduced from outside and can thus be decreased in the cost of production.
For achievement of the object of the present invention, an electronic apparatus is provided for use in recording and/or playing back audi

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