|150,000yen(around the 1980 time)
The high precision player system which realized the
extraordinary stability by pursuit of the high precision, and gazed at the true
nature of pre Ya to the extreme.
In the actuator, the nakedness property
of the rotation before applying a servo itself was improved, and the
extraordinary rotation precision is realized by developing and carrying SH and a
rotor (Stable Hanging Rotor) scheme to it.
The unique structure which moved
the supporting point of the rotor which suited the motor bottom until now to
immediately under the turntable is used for SH and a rotor scheme, and it has
succeeded in coinciding the centroid and the supporting point of a turntable
mostly by this.
The motor shaft was fixed, the ball bearing was prepared on
it, the structure contrary to the former of rotating a rotor has realized, and
this has canceled carrying out an unstable reverse cone motion by congruential
of the supporting point.
Moreover, in the motor, the high torque DC servo
motor of 2 kg-cm which carries out the constant-speed rotation of the turntable
of 31cm [ in diameter ] and inertial-mass 480 kg-cm2 within 1/3
rotation (about 1 second) is carried, and the outstanding stability is realized
Different low voltage casting from the conventional turntable
process is used for a turntable in order to acquire the rotation stabilized more and the outstanding acoustic feature.
This poured in the metals slowly into the model molded very precisely, it is a handmade process which carries out a natural air cooling over many hours, and since there are few air bubbles etc. and the interior is kept uniform, it has realized the dynamic balance which is a high-density and was superior to the conventional scheme.
Moreover, in order
to carry out the deadning of a turntable's own vibration, the special vibration
proof agent was given to the rear view, and the resonance which has an ill
effect on a tone quality is prevented.
Pioneer has adopted as the
magnetic pole change (switching) organization of a motor the uncontacted change
scheme by the hall device which developed the process uniquely.
the high SN ratio is realized by making an actuator into SH and a rotor scheme
by banishing the detailed noise generated between the motor shaft and the
bearing until now, and also performing a special vibration proof manipulation to
the interior of a phone motor unit.
The 1kg heavy weight class arm base
which started brass Naked material one by one by handmade is adopted as the arm
base. Furthermore, eight metals wings have adopted the chocking joint scheme
which wraps the whole arm axis surface equally and binds it tight as the
supporting part which fixes an arm axis.
Thereby, unlike the general type of
mounting which carries out the screw stop of a Tip of the Day or several places,
ガタ was banished and the occurrence of the partial vibration is prevented.
Moreover, the chocking joint scheme is adopted also as the applied part of a
head shell, and tone-quality investigation by thorough absent-resonance-izing is
In order to realize a high sensitivity, controlling the low-pass vibration
generated by the decentration which the record marketed has, or curvature,
the newly developed level variable oil braking scheme is adopted.
Silicon oil is poured into the oil cup prepared in the arm bearing part,
and this serves as a scheme with which the amount of braking for which
it is a structure to which a dumping is applied and was perpendicularly
and horizontally suitable, respectively by calming the braking fin of the
shape of a ring which cut the leading end into 45 degrees is applied at
a Tip of the Day. While reducing Q of a low-pass vibration by this, flat-ization
of a mechanical impedance is realized.
The amount of braking also serves as a
design which becomes large, and proper use with MC type to broad hi-compliance
man-month type with thereby comparatively much low compliance type is possible
for it as the tick mark of a level adjustment ring becomes large to a
freelancer, and 1-5 in the location of 0. Moreover, the hericoid type which
performed the high-precision wrapping manipulation was adopted as the level
adjustment ring, and the partial vibration is prevented.
The main wait
was brought close to an arm axis, the mass centralization system which reduced
the equivalent mass of the needle point is adopted as a tone arm part, and the
basic performance before applying oil braking is also raising it by making the
moment of inertia of a tone arm reduce.
Moreover, full use of the high
precision processing technology of Pioneer which is proud of micra order was
made in the bearing part of the tone arm, and the stability support which stores
the pivot in a pivot holder and is supported by a spring is adopted as it.
The tone arm serves as a long type design of 282mm of effective lengths who
use a high-rigidity aluminum pipe, and has equipped standardly the head shell
made from a carbon fiber of a low-mass and a high rigidity.
heavy weight class cabinet is adopted as a cabinet. This cabinet serves as a
firm design which carried out the four-layers laminating of the large
needle-leaf tree solid board of a high rigidity, increased specific gravity, and
an internal loss chosen after the trial production and the study with various
Furthermore, the centroid of a player system and the supporting
point of the insulator were made into the almost same height, and the insulator
of the newly developed low centroid structure supported by a spring is adopted
as an insulator.
In order to suppress the transmit loss in the lead
wire, the output codes, and those contacts of a tone arm to the minimum, the
oxygen-free-high-conductivity-copper line of low capacity and the terminal of
gilding are adopted.
The start stop button of a pure electronic formula
The smoked degree acrylics hood of the 5mm thickness
completed by handcrafts is equipped standardly.
The turntable sheet
excellent in the acoustic feature is adopted.
||Cartridgeless player system
|<Phone motor part>
||Quartz PLL DC servo hall motor
||SH and a rotor scheme
|Turntable inertial mass
||480kg-cm2 (turntable sheet
||33 1 / 3 or 45rpm
|Rotational frequency change
||The electronic formula by a short stroke
||0.009% or less (WRMS/FG Direct-reading
0.018% or less (WRMS/Japanese Industrial Standard)
||78dB or more (DIN-B)
68dB or more
(Japanese Industrial Standard)
||0% (less than 300g of stylus forces)
||Less than 1/3 rotation
|Velocity detection scheme
||Perimeter integrator type FG
|Rotational frequency deflection
||0.002% or less
||Time drift : 0.00008%/h
drift : 0.00003%/degree C
||Pure electronic formula
|<Tone arm part>
||Good transformation oil braking scheme
static balance S character type pipe arm
||+ 1.8 degrees-1.1 degrees
||1g (0.1g tick mark) of wait 1 rotations
|Conformity cartridge self-weight
||4g-24g (at the time of an attached shell
|Height adjustable range
||7.6g of carbon fiber head shell self-weights
|An attached organization
||Quartz locking-in Decatur
|The semiconductor used etc.
||Quartz crystal: One
||Width 550x height 214x depth of 440mm