Magnetic recording and reproducing apparatus with a rotary...

Details Magnetic recording and reproducing apparatus with a rotary... Magnetic recording and reproducing apparatus with a rotary...

1999-03-19

2001-03-20

Miller, Brian E. (Department: 2754)

Dynamic magnetic information storage or retrieval

Head mounting

For moving head during transducing

C360S271800

Reexamination Certificate

active

06205006

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of magnetic recording and reproducing apparatuses such as video tape recorders which transport a magnetic tape around a rotary head cylinder unit, to which a magnetic head is attached, to bring the magnetic head and magnetic tape into contact for recording and reproducing signals.
2. Description of the Related Art
Magnetic recording and reproducing apparatuses such as videocassette tape recorders are becoming increasingly smaller and thinner.
A conventional magnetic recording and reproducing apparatus is described below.
FIG. 18
is a schematic top view of a conventional magnetic recording and reproducing apparatus in a position for recording signals onto a magnetic tape or playing back signals from a magnetic tape. A magnetic tape
2
is housed in a cassette
1
, and is wound on reels
3
and
4
provided in the cassette
1
. Signals are recorded on and reproduced from the magnetic tape
2
by slipping the magnetic tape
2
around a portion of a rotary head cylinder unit
5
(hereafter referred to as “cylinder unit”) to which a magnetic head (not illustrated) is attached. The cylinder unit
5
is fixed onto a chassis
6
. Tape guide posts
7
,
8
,
9
,
10
,
11
,
12
,
13
,
14
, and
15
are provided for leading the magnetic tape
2
out from the cassette
1
and guiding it to a predetermined position for recording and reproducing signals.
Next, how the cylinder unit
5
is fixed onto the chassis
6
is described.
FIG. 19
is a sectional view of the cylinder unit
5
of the conventional magnetic recording and reproducing apparatus fixed onto the chassis
6
.
FIG. 20
is a plan view taken in the direction of Line D of FIG.
19
. There are three set screws
190
which are engaging members for fixing the cylinder unit
5
to the chassis
6
. There are three compression springs
191
corresponding to the set screws
190
, respectively. The compression springs
191
are fixed at a constant load to avoid distortion of the cylinder unit
5
. The cylinder unit
5
is attached to the chassis
6
by the set screws
190
through the compression springs
191
.
With the above conventional configuration, however, a large height space is required for the set screws
190
and compression springs
191
in order to fix the cylinder unit
5
onto the chassis
6
at a constant load to prevent distortion. This presents a barrier to reducing the size of the magnetic recording and reproducing apparatus.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a thin magnetic recording and reproducing apparatus without allowing distortion of the cylinder unit. In the present invention, the cylinder unit is fixed onto the chassis with a constant load, but requires only a small amount of space for attaching the cylinder unit onto the chassis.
A magnetic recording and reproducing apparatus of the present invention comprises a set screw having an external thread; a rotary head cylinder unit having an internal thread which screws onto the external thread of the set screw; a chassis on which the rotary head cylinder unit is mounted, with a hole to allow the passage of the set screw; and a leaf spring whose pressure on the chassis increases as the external thread of the set screw is screwed and tightened to the internal thread of the rotary head cylinder unit. This configuration allows the height of the set screw used for fixing the rotary head cylinder unit onto the chassis to be reduced, which permits the rotary head cylinder unit to be secured to the chassis with a constant load using a smaller space than that required in the prior art apparatuses. This allows the mechanism to be constructed so as to have a thinner profile.


REFERENCES:
patent: 1578161 (1926-03-01), Monroe
patent: 1793116 (1931-02-01), Monroe
patent: 2423918 (1947-07-01), Wohlhieter
patent: 3943569 (1976-03-01), Bettini et al.
patent: 5021908 (1991-06-01), Morimoto et al.
patent: 5459625 (1995-10-01), Ohshima et al.
patent: 5831796 (1998-11-01), Nishida
patent: 5883751 (1999-03-01), Choy
patent: 619160 (1935-10-01), None
patent: 6-150473 (1994-05-01), None

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