|
| Lo-D HT-464 |
|
| 39,800yen(around the 1979 time) |
HT-860, the DD full auto player developed from the
same design concept as HT-660 and the highly efficient player of the continuing
Lo-D.
The uni-torque motor by a technology original with a Lo-D is
carried in the motor.
A uni-torque motor is a motor which asked for perfect
circular motion from the principle,A rotor magnet of a doughnut form by which
the magnetizing was carried out, and 2 sets of star-shaped flat coils shifted
22^5 degrees are consisted of by eight poles, and the amount of torque generated
from these two coils and magnets becomes fixed very always about which moment.
This principle can be expressed with the easy numeric expression
"sin2theta+cos2theta=1." In the uni-torque motor, further,
the simple structure of a brushless and a slotless & coreless is adopted, and the endurance is also improving sharply.
The exclusive DC motor is
adopted as an arm drive, and the full auto organization in which the influence
which it has on a turntable was suppressed is carried.
It is designed so
that this full auto organization may not interfere at the time of a manual
operation.
The high-electron type Ohtori turn detection organization
which can carry out a return detection by no contacting by the light source
(light emitting diode), a shutter, and a photosensor (Cds) is adopted.
The gimbal support scheme tone arm is adopted.
The head shell
containing a glass fiber is adopted as a head shell.
|
| Form |
DD full auto player system |
| <Phone motor part>
|
| Drive system |
DD full auto |
| Motor |
Flat form non-commutator DC servo motor
(uni-torque motor) |
| Turntable |
310mmphi aluminum die casting
|
| constant-speed |
33 1 / 3 or 45rpm |
| Speed switching |
Electronic control scheme |
| Speed adjustable range |
33 1/3rpm : ±3%
45rpm : ±4%
(Both
speed common coordination) |
| Wow and flutter |
0.03%(WRMS) |
| SN ratio |
77dB(DIN-B) |
| <Tone arm part>
|
| Tone arm |
Stylus-force Direct-reading type static
balance type pipe arm
Head shell exchange system |
| Arm effective length |
220mm |
| Overhang |
15mm |
| Tracking error |
2 degrees |
| Stylus-force adjustable range |
0-3g / 1 rotation (being a 0.1g step Direct
reading) |
| Application cartridge weight |
4g-10g |
| <Cartridge part>
|
| Cartridge |
man-month type (MT-24) |
| Frequency characteristic |
10Hz - 25kHz |
| Output voltage |
3mV (1kHz is level 50 cm/s)
|
| Channel balance |
1dB |
| Crosstalk |
25dB |
| Stylus force |
2g |
| The needle used |
0.5mil diamond stylus (DS-ST24)
|
| <Synthesis>
|
| Supply voltage |
AC100V, 50Hz/60Hz |
| Power consumption |
5.5W |
| Dimensions |
Width 435x height 128x depth of 375mm
|
| Weight |
5.5kg |
|
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