Dynamic magnetic information storage or retrieval – Head mounting – For moving head during transducing
Reexamination Certificate
2002-05-09
2004-01-13
Letscher, George J. (Department: 2652)
Dynamic magnetic information storage or retrieval
Head mounting
For moving head during transducing
Reexamination Certificate
active
06678124
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a magnetic recording and reproduction apparatus for performing recording and reproduction of signals to or from a magnetic tape which is wound around a rotation head cylinder of the magnetic recording and reproduction apparatus.
2. Description of the Related Art
FIG. 11
is a plan view of a conventional magnetic recording and reproduction apparatus
100
. As shown in.
FIG. 11
, the magnetic recording and reproduction apparatus
100
includes a substrate
1
and a rotation head cylinder
2
attached to a cylinder attachment section
3
of the substrate
1
.
FIG. 12
is a plan view of the substrate
1
. The substrate
1
has a first through-hole
4
having a diameter C
1
, a second through-hole
5
having a diameter C
2
, a first positioning pin
6
having a diameter D
1
and pressure-inserted into the substrate
1
, and a second positioning pin
7
having a diameter D
2
and pressure-inserted into the substrate
1
.
FIG. 13
is a bottom view of the rotation head cylinder
2
. The cylinder
2
has a first female screw
8
, a second female screw
9
, a first positioning hole
10
and a second positioning hole
11
. The first positioning hole
10
is circular and has a diameter E
1
. The second positioning hole is substantially slot-shaped and has a width E
2
.
FIG. 16
is a cross-sectional view of the conventional magnetic recording and reproduction apparatus
100
taken along line H—H in FIG.
11
. As shown in FIG.
16
, the rotation head cylinder
2
is attached to the substrate
1
via a first attaching screw
22
inserted Into the through-hole
4
of the substrate
1
and a second attaching screw
25
inserted into the through-hole
5
of the substrate
1
.
FIG. 14
is a side view of the first attaching screw
22
. The first attaching screw
22
includes a (first) cylindrical section
23
having a diameter A
1
and a (first) male screw
24
projecting from the first cylindrical section
23
.
FIG. 15
is a side view of the second attaching screw
25
. The second attaching screw
25
includes a (second) cylindrical section
26
having a diameter A
2
and a (second) male screw
27
protecting from the second cylindrical section
26
.
Returning to
FIG. 16
, the first attaching screw
22
is inserted into the through-hole
4
of the substrate
1
, so that the first male screw
24
is engaged with the first female screw
8
of the rotation head cylinder
2
. A coil spring
14
a
, interposed between a head of the first attaching screw
22
and the substrate
1
, loads the first attaching screw
22
in such a direction as to pressure-contact the rotation head cylinder
2
to the substrate
1
. Likewise, the second attaching screw
25
is inserted into the through-hole
5
of the substrate
1
, so that the second male screw
27
is engaged with the second female screw
9
of the rotation head cylinder
2
. A coil spring
14
b
, interposed between a head of the second attaching screw
25
and the substrate
1
, loads the second attaching screw
25
in such a direction as to pressure-contact the rotation cylinder
2
to the substrate
1
.
FIG. 17
is a cross-sectional view of the conventional magnetic recording and reproduction apparatus
100
taken along line I—I in FIG.
11
. The first positioning pin
6
is engaged with the first positioning hole
10
, and the second positioning pin
7
is engaged with the second positioning hole
11
. In general, relationships of the sizes of the pins, screws and holes are set as follows.
0.0002 mm<E
1
-D
1
<0.1 mm
0.0002 mm<E
2
-D
2
<0.1 mm
0.1 mm≦C
1
-A
1
0.1 mm≦C
2
-A
2
Therefore, the positioning precision of the rotation head cylinder
2
on the substrate
1
required for reliable operation of the conventional magnetic recording and reproduction apparatus is determined by the relationship in size between the first positioning pin
6
and the first positioning hole
10
, and the relationship in size between the second positioning pin
7
and the second positioning hole
11
. The first cylindrical section
23
and the first through-hole
4
have a gap therebetween, and the second cylindrical section
25
and the second through-hole
5
have a gap therebetween. Therefore, the first and second attaching screws
22
and
25
and the first and second through-holes
4
and
5
do not influence the positioning precision.
As described above, the conventional magnetic recording and reproduction apparatus
100
requires two positioning pins
6
and
7
in correspondence with two positioning holes
10
and
12
in order to provide a positioning precision of the rotation head cylinder
2
to the substrate
1
. Such an arrangement undesirably complicates the structure of the magnetic recording and reproduction apparatus. Furthermore, since a large number of elements are required to be precisely positioned relative to each other, there is a high possibility of imprecise positioning of the rotation head cylinder
2
.
SUMMARY OF THE INVENTION
According to one aspect of the invention, a magnetic recording and reproduction apparatus for recording and reproducing a signal to and from a magnetic tape includes a substrate having a first positioning engagement hole and a second positioning engagement hole; a rotation head cylinder provided on the substrate and having the magnetic tape wound therearound over a prescribed angle, the rotation head cylinder having a first female screw and a second female screw; a first attaching screw having a first cylindrical section for insertion into the first positioning engagement hole and engagement with the first female screw; and a second attaching screw having a second cylindrical section for insertion into the second positioning engagement hole and engagement with the second female screw. The first cylindrical section has a diameter A
1
, the first positioning engagement hole has a diameter B
1
, the second cylindrical section has a diameter A
2
, and the second positioning engagement hole has a width B
2
, and A
1
, A
2
, B
1
and B
2
fulfill the following relationships:
0.0002 mm<B
1
-A
1
<0.1 mm,
and
0.0002 mm<B
2
-A
2
<0.1 mm.
According to another aspect of the invention, a magnetic recording and reproduction apparatus for recording and reproducing a signal to and from a magnetic tape includes a substrate having a first positioning engagement hole and a second positioning engagement hole; a rotation head cylinder provided on the substrate and having the magnetic tape wound therearound over a prescribed angle, the rotation head cylinder having a first female screw and a second female screw; a first attaching screw having a first male screw for insertion into the first positioning engagement hole and engagement with the first female screw; and a second attaching screw having a second male screw for insertion into the second positioning engagement hole and engagement with the second female screw. The first male screw has a diameter A
1
, the first positioning engagement hole has a diameter B
1
, the male screw has a diameter A
2
, and the second positioning engagement hole has a width B
2
, and A
1
, A
2
, B
1
and B
2
fulfill the following relationships:
0.0002 mm<B
1
-A
1
<0.1 mm,
and
0.0002 mm<B
2
-A
2
<0.1 mm.
In one embodiment of the invention, one of the first and second positioning engagement holes is circular and the other of the first and second positioning engagement holes is substantially slot-shaped.
In one embodiment of the invention, the magnetic recording and reproduction apparatus further includes a third attaching screw for insertion into a third positioning engagement hole of the substrate.
In one embodiment of the invention, the third attaching screw has a clearance equal to or greater than 0.1 mm when inserted into the third positioning engagement hole.
In one embodiment of the invention, a first coil spring is provided between a head of the first attaching screw and the substrate and a second coil spring is provided between a head of the second attaching screw and the subst
Hirabayashi Koichiro
Konishi Akio
Letscher George J.
Renner Otto Boisselle & Sklar
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