The compact disk player which asks the first
generation who adopted the turntable scheme.
scheme into which it was made to develop from a disk stabilizer is adopted.
It is possible to support a disk all over a turntable from the bottom like an analog player by considering it as a pickup and the structure of installing a
spindle motor in the upper portion of a disk.
It is strong on the disk whose moment of inertia of a turntable improves
by about 3 times over the past and which has the influence of an extraneous
vibration or sound pressure, and curvature by this, and it is possible
to suppress an unnecessary oscillation of a disk.
8fs digital filter and the right-and-left independent bit stream digital
analog converter are carried in the D-A-conversion part.
This digital analog
converter does not have theoretically an occurrence of the nonlinear distortion
resulting from the error of an electrical resistor like a multiple bit scheme,
or gap of timing of operation, or zero cross distortion. By performing high
oversampling called 192fs based on a 3rd [ further ] noise shaper, the influence
of a noise shaper is suppressed low.
Moreover, by a 1-bit scheme, all the
operations are controlled with the system-clock, and the Jitter of a
system-clock affects a performance. In order to avoid the influence, it is made
to operate with the same low system-clock (16.93MHz) as the conventional
multiple bit scheme.
Moreover, attention is also paid to application and
vibration proof and magnetic-shield treatments, such as preparing the
independent oscillator circuit, have been performed.
In order to
transmit a music signal purely, the direct construction is adopted and
shortest-ization of a signal path is realized with arranging main circuitries in
a simple & straight along with the fluence of a signal.
center tray design which allotted the pickup mechanism in the center was begun,
digital one/servo, and the audio substrate were separated, and the interference
in each circuitry is prevented. Furthermore, an analog circuit substrate also
ties even an output-terminal with the shortest distance from an input, and is
considered as the symmetrical stream composition.
This has eliminated the
break-in of the noise by leading about of product-line material, and the
interference between circuitries.
The proprietary clean laser pickup is
adopted as a pickup, and the power loss of optical system is decreased by
reducing optical components, such as a collimator lens. Furthermore, the aberration in an optical path is reduced and the pickup of little distorted
signal is enabled.
Moreover, highly precise precision form is realizable by
having adopted the engineering plastic body as the body, dividing the pickup
body into about 1000 member, and conducting an intensity analysis.
Furthermore, I/V transducing head amplifier is built in the photodetector, and the transmit strong against a disturbance noise is enabled by amplifying for
about 200mV order.
Class-A operation FET buffer amplifier is adopted as
an audio circuitry, an Output load impedance is lowered and the influence of the
load intensity of the amplifier connected etc. is reduced.
Class-A operation, the variation of the power consumption at the time of an
operation was reduced, and the stable waveform transmission is realized.
When highly precise 4 splitting photodetector receives laser light, the
phase difference arises between a lead signal and a Yukinobu Ushiro number, and
disorder produces it to RF signal. In order to improve this, the Accu Focus
system is adopted, and RF signal with little reading error has been acquired by
delaying the signal of a lead and making it agree with the signal of the back
line by a delay circuit.
The brushless hall motor of starting torque 65
g-cm is carried in the spindle motor. Furthermore, the phi4.5mm very-thick shaft
and the rotation performance conjointly stabilized in a load variation strongly
Moreover, the silence linear motor servo mechanism in whom
a quiet and smooth operation is possible is employed as a pickup drive, and the
quick access is enabled.
In order to protect an optical mechanism from
an extraneous vibration, the lamisert Mechanism-base is adopted.
up two steel plates, is what carried out molding by the special resin, and also
is suppressing the improvement in a periodic-damping property, and the
occurrence of a magnetic distortion by giving a copper plating.
this Mechanism-base has mounted special rubber and a spring on a mechanism
chassis through the coaxial-ized coaxial suspension,the extraneous vibration
from a chassis is intercepted by mounting the turntable base through a coaxial
suspension similarly, and it being alike, respectively, and considering it as a
flow and a structure.
The newly developed multilayer structure honeycomb
chassis is adopted as a chassis.
Greatly, internal losses are the steel
plate excellent in the electromagnetic shielding, and the thing which piled up
cushion material, reduce an unnecessary oscillation according to the outstanding
vibration suppression effect based on the honeycomb chassis by BMC (Bulk Molding
Compound) of a high rigidity, and are also suppressing the reflection of the
sound from a floor low.
Furthermore, by k which installs the 5th insulator
in the chassis central part at an insulator, vibration proof and a weight
balance are maintained and the center mechanism is supported.
power transformer which made it become independent digital one/object for servo
circuitries, and for analog circuits is carried in the power-source part.
Furthermore, the by filer volume is adopted as the transformer for audio
circuitries, by raising the degree of balance of installation of an Output load
impedance or an inductance, the power source by the side of + and - is supplied
on the same requirements, and a transparent feeling and a low-pass feeling of a
drive are improved.
Moreover, the power circuit had employed 4 part 11
regulator, carried out the independent rectification of the four parts of a
servo/digital one, a servo drive, + of an audio, and -, and has eliminated the
The clean microcomputer which operates only when
the operation key is pressed is carried, and the scanning noise is canceled.
Digital one / analog out change-over switch is carried.
display-deviceoff switchpoint is carried in consideration of the scanning noise
occurrence at the time of display-device lighting.
||Compact disk player
||3 beam semiconductor laser scheme
||2Hz - 20kHz
|SN ratio (EIAJ)
||115dB or more
|Dynamic range (EIAJ)
||99dB or more
|Channel separation (EIAJ)
||110dB or more
|Wow and flutter (EIAJ)
||Below a limit of measurement (±0.001%W.PEAK)
||0.0017% or less
|The number of channels
||Two channels (stereo)
||Coaxial output: 0.5 Vp-p/75ohm
power: -15dBm--20dBm (wavelength of 660nm)
||Width 420x height 130x depth of 330mm