|
| Lo-D HT-660 |
|
| 67,000yen(around the 1979 time) |
The Quartz nowait lock and the full auto player
system which carries an electronic return.
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.
In
HT-660, the crystal control (Quartz nowait-lock PLL servo) hardly influenced by
the voltage fluctuation, or temporality and a temperature change was poured on
this uni-torque motor, and the high-precision rotation is realized.
Moreover, a startup property reaches a constant-speed in 1/2 rotation.
The electronic braking system which can perform a record switching and a
velocity switching quickly is built in. This is shortening this stop time for
about 25 seconds in no equipping DD till about 3 seconds.
By adoption of
2 motor system which became independent about the motor for a turntable
rotation, and the motor for an arm drive, a cross interferencee is lost, and it
considers so that a basic performance may not be spoiled.
The
photoelectron type Ohtori turn detection organization is carried.
Unlike the conventional mechanical return detection scheme, a return is
possible by no contacting in the combination of the light source (light
emitting diode), a shutter, and a photosensor (Cds).
It is possible to carry the arm height adjustment mechanism, to adjust the degree of level of an arm
correctly, and to rectify a vertical tracking angle error.
A thing 330mm
in diameter is adopted as a turntable.
The front operation soft push
switch which can perform an easy operation with a book jacket closed is adopted.
|
.JPG) |
.JPG) |
| Form |
Quartz nowait-lock DD full auto player
system |
| <Phone motor part>
|
| Drive system |
Quartz nowait-lock DD full auto
|
| Motor |
Flat form non-commutator DC servo motor
(uni-torque motor) |
| Turntable |
330mmphi aluminum die casting
|
| Constant-speed speed |
33 1 / 3 or 45rpm |
| Wow and flutter |
0.025%(WRMS) |
| SN ratio |
75dB(DIN-B) |
| Load characteristics |
0% |
| Rotational frequency deflection |
Less than 0.003% |
| <Tone arm part>
|
| Tone arm |
Stylus-force Direct-reading type static
balance type pipe arm |
| 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 |
| Arm height adjustable range |
3mm |
| <Cartridge part>
|
| Cartridge |
VM form (VFS-261) |
| Frequency characteristic |
20Hz - 20kHz |
| Output voltage |
3mV (1kHz, 50 mm/s) |
| Channel balance |
1dB |
| Stylus force |
2g |
| The needle used |
0.7mil diamond stylus (DS-ST26)
|
| <Cabinet part>
|
| Cabinet |
The product made from aluminum die casting
|
| Insulator |
Air suspension |
| <Synthesis>
|
| Supply voltage |
AC100V, 50Hz/60Hz |
| Power consumption |
5.5W |
| Dimensions |
Width 454x height 140x depth of 391mm
|
| Weight |
9kg |
|
|
|