The compact disk player of No. 2 by which
high-quality sound-ization was attained by the comprehensive technical
capabilities of Hitachi Lo-D.
Three spot schemes laser pickup servo is
In this servo, two sublaser spots for a tracking error detection
shifted a little to right and left other than the main laser spot which reads a
signal are arranged. When tracking is being carried out correctly, the reflected
light output of two sublaser spots is the same, but if it shifts even when it is
small, a difference will appear in the quantity of the reflected light from the
pit gathered at the sublaser spots 1 and 2, and an output will become
imbalanced. This detects a tracking error quickly.
The laser light which passed the cylindrical lens has adopted as the focal
error resulting from Hure of the upper and lower sides by the curvature
of a disk the "longwise ellipse -> complete-round -> oblong
ellipse" and the focal signal detector using the property of changing.
According to the form of the laser light included in a
detector, if it is a complete round and is an exact Focus and an ellipse, it is
judged as a focal error, and the error signal is outputted quickly.
The objective lens two-dimensional drive actuator original with a roadeo
to which an objective lens is moved quickly is carried to a tracking error-correction
signal and a focal error-correction signal.
It is an actuator similar to the voice
coil of the loudspeaker, and the tracking Focus with an exact submicron
precision is realized by carrying out the high-speed migration of the lens to a
correction fraction at the 2-way of the upper and lower sides and right and
The Lo-D has adopted LSI and IC which carried out the exclusive
design as all the circuitries, such as a data strobe circuitry which
distinguishes a digital signal, and a digital disposal circuit which carries out
the detection correction of the error and rearranges a signal as a format.
The brushless, the coreless, and the uni-torque motor of a slotless are
carried in the disk motor.
The audio peculiar part, a quality pure Focus
capacitor, the 11th low pass filter which selected every article carefully are adopted as an analog circuit.
An operation of random-memory song
selection, direct song selection, and one-touch song selection, an index search, a manual search, a song selection head-search pause, etc. is possible.
Moreover, the repeat function which can choose all songs / song selection /
1 music / zone is carried.
An output sound volume can be adjusted.
There was a wired remote control unit as an option.
||Compact disk player
|The number of channels
|Wow and flutter
||Below a limit of measurement (±0.001%W.Peak)
||60 minute / single sided (possible for a
maximum of 75 minutes)
|The number of quatizations
||A 16-bit linear / channel
|Transmit bit rate
||Objective lens drive system optical pickup
|Objective lens drive system
||Two-dimensional parallel drive
||Width 435x height 110x depth of 264mm
||Wired remote control unit returns-to-biases-800 (6,000yen)