be charged to attract the parallel flexures, causing the case 12. As can be appreciated, the cartridge 46 is fixed
optics to move toward or away from the optical disk in position relative to the case 12 by the receiving chan
surface. Due to the adjustability of the parallel base nels 48 and 50. Thus, it is possible to reposition the
plates, it is possible to position the optics at a distance optical storage disk 44 within the cartridge 46 without
equal to their focal length from each surface of the 5 moving the cartridge 46, as will be subsequently de
optical storage disk. This allows the optics to be posi- scribed in greater detail.
tioned in the center of their adjustable travel and move- Referring to FIG. 3, a more detailed, partially cut
ment thereof is oltly required to compensate for disk away isometric view of the apparatus 10 is shown,
surface incongruities rather than for thickness varia- Within the storage case 12 is positioned an upper base
tions. 10 plate 14 and a lower base plate 16. The upper and lower
It is a technical advantage of the present invention base plates 14-16 are constructed essentially the same
that both sides of an optical storage disk may be read except that the lower base plate 16 is provided with a
simultaneously allowing on-line data to be doubled and disk drive motor 18 and a disk drive spindle 20 (FIG. 4).
data transfer time to be cut in half. It is a further techni- ^ md lower base lates 14_16 m each
cal advantage of the present invention that fixed focal 15 vided with a ^ of 22_M ^ 26_28> c.
length optics may be used while maintaining the ability tivd ^ 26 and 2g shown in FIG 5) Thg M
to focus on the surface of the optical disk. It is a still pivotally connect the upper and lower base plates
further technical advantage of the present invention 14_16 tQ a frame 19 within thfi case u Each base late
that a variety of optical disks may read on an inter- 14_16 is matched with a lea(J screw 3Q or 32> respec.
changeable basis. 20 dvely scfew 32 shown in FIG 5) Lgad screw 30
BRIEF DESCRIPTION OF THE DRAWINGS is provided with a follower nut 34 and lead screw 32 is
For a more complete understanding of the present provided with a follower nut 36, each of which are
invention and for further advantages thereof, reference driven by separate stepper motors 38 and 39 (follower
is now made to the following Detailed Description 25 nut 36 and motor 39 shown in FIG- 5)- ^ follower
taken in conjunction with the accompanying Drawings nuts ^ connected to their respective base plates
in which: 14-16 by yokes 40 and 42.
FIG. 1 is an isometric view of an optical disk reader As the stepper motors 38 and 39 turn the lead screws
constructed in accordance with the preferred embodi- 30-32, the follower nuts 34-36 travel therealong caus
ment of the present invention; 30 ing the appropriate yoke 40-42 to raise or lower the
FIG. 2 is an isometric view of an optical disk reader attached base plates 14-16. Thus when the cartridge 46 of the present invention with an optical disk cartridge is inserted into the reading apparatus 10 along the reinserted therein; ceiving channels 48 and 50, the upper and lower base
FIG. 3 is a partially cut away isometric view of the plates 14-16 are pivotally adjusted by their respective
optical disk reader and optical disk cartridge of the 35 motors 38 and 39. The base plates 14-16 are pivotally
present invention; adjusted until the disk 44 is the proper focal distance
FIG. 4 is a sectional view along the line 4—4 of FIG. from optics associated with each base plate 14-16, as
3; will be subsequently described in greater detail. The
FIG. 5 is a top plan view along the line 5—5 of FIG. motors 38 and 39 are geared to allow manual rotation of
4; 4Q the lead screws 30-32 should the need arise such as
FIG. 6 is a sectional view taken along the line 6—6 of during a loss of power. The motors 38 and 39 are also
FIG. 5; designed to remain engaged to act as a brake to prevent
FIG. 7 is a sectional view taken along the line 7—7 of unwanted movement of the base plates 14-16 once they
FIG. 6; are properly positioned.
FIG. 8 is an isometric view of both lead screw assem- 45 Referring to FIG. 4, a sectional view is shown of the
blies of the present invention; and apparatus 10 along the line 4-4 of FIG. 3. The frame 19
FIGS. 9, 10 and 11 are representations of the inter- is separated from the case 12 by shock mounts 21. The
relationship between the lead screws and the yokes in drive motor 18 depends downwardly from the lower
various operating positions. base plate 16. The spindle 20 protrudes through the
DETAILED DESCRIPTION OF THE 50 cartridge 46 into contact with the disk hub means 63
INVENTION (see FIG. 7) for rotational drive thereof. The hub means
In FIGS. 1-12, like items are identified by like and 63 mav 1x5 held bv ^ appropriate means, such as magcorresponding numerals for ease of reference. Referring netically, and torque may be applied thereto by a pin, first to FIG. 1, an isometric view of an optical storage not shown. A protrusion 23 depends downwardly from disk reading apparatus constructed in accordance with 55 the upper base plate 14 opposite the spindle 20 to prethe preferred embodiment of the present invention is vent damage to optics associated with each plate 14-16 generally identified by the reference numeral 10. The bV the disk **■ If the apparatus 10 were bumped hard reading apparatus 10 comprises a storage case 12 for enough to cause the disk 44 to momentarily move off containing the devices to simultaneously read both sides the spindle 20, the protrusion 23 would prevent excesof an optical storage disk 44 (See FIG. 7), as will be 60 sive wobble of the disk 44 by coming into contact with subsequently described in greater detail. The case 12 has a hub means 63 ^lG- V flxed thereto, an opening slot 13 for receiving an optical storage disk The hinge 22 is pinned to the frame 19 through a cartridge 46 within receiving channels 48 and 50. A bracket 25 while the hinge 26 is similarly pinned hinged door (not shown) may be provided for closing through a bracket 27. The yoke 40 is pivotally attached the opening slot !3 when the apparatus 10 is not in use. 65 to the upper base plate 14 through an extension bracket A power and control strap 15 extends from the case 12 29, as will be subsequently described in greater detail, for connection to other appropriate devices, not shown. The receiving channels 48 and 50 are secured to the
Referring to FIG. 2, the apparatus 10 is shown with frame 19 by means, not shown, to fix their position
an optical storage disk cartridge 46 inserted into the relative thereto.