Dynamic magnetic information storage or retrieval – Recording on or reproducing from an element of diverse utility – Motion picture film
Reexamination Certificate
1997-10-29
2002-01-01
Sniezek, Andrew L. (Department: 2651)
Dynamic magnetic information storage or retrieval
Recording on or reproducing from an element of diverse utility
Motion picture film
C360S241300, C360S241100, C360S291000, C360S251000, C396S320000
Reexamination Certificate
active
06335839
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims priority of Japanese Patent Application No. 08-288643 filed Oct. 30, 1996, the contents being incorporated herein by reference.
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic head device in the form of a film image input device that reads images recorded on photographic film. More particularly, the present invention relates to a magnetic head device that can record magnetic information and convert the magnetic information into image signals. The present invention also relates to a camera that takes photographs and magnetically records photographic conditions onto photographic film.
In recent years, cameras designed to use film that have a magnetic recording section, in addition to an image recording section, have been known. Viewers that convert an image on photographic film into an electrical image signal to be displayed on a cathode ray tube (“CRT”) have also been known. These types of cameras and viewers read film information, such as film speed and number of photographed frames, that has been stored in the magnetic record section. These types of cameras also record photographic information, such as aperture and shutter speed, in the magnetic recording section.
FIG. 8
(prior art) is an elevated perspective view of a magnetic recording and playback head unit used in a conventional image input device. As illustrated in
FIG. 8
playback head
104
and recording head
105
are adjacently fixed to head base plate
113
. Head base plate
113
is energized by springs
118
a
and
118
b
to move along parallel guiding rods
114
a
and
114
b
in the direction of arrow C. A pin (not shown in
FIG. 8
) on head base plate
113
makes contact with an upper edge
103
E of film
103
in response to an energy imparting force from springs
118
a
and
118
b
. Pin enables playback head
104
and recording head
105
to maintain a specified distance from upper edge
103
E of film
103
. As a result, playback head
104
and recording head
105
respectively play back and record the information on magnetic recording section
108
of film
103
.
Guiding rods
114
a
and
114
b
are fixed to a base member
120
. Rotation shafts
123
a
and
123
b
(only
123
b
is shown in
FIG. 8
) protrude from base member
120
almost parallel to the moving direction of film
103
. Rotation shafts
123
a
and
123
b
are inserted into rotation guides
121
a
and
121
b
so that head base plate
113
rotates about rotation shafts
123
a
and
123
b
. Spring support section
115
is fixed to guiding rods
114
a
and
114
b
. Springs
116
a
and
116
b
, attached to spring support section
115
, energize head base plate
113
in a downward direction toward the film
3
. As a result, playback head
104
and recording head
105
are pressed against a pad (not shown in
FIG. 8
) by springs
116
a
and
116
b
with film
103
between the pad and heads
104
and
105
. The recording head
105
and playback head
104
maintain contact with film
103
specified distance from upper edge
103
E of film
3
, to enable information to be recorded and played back.
In order to maximize playback and recording quality, recording head
105
and playback head
104
should both contact film
3
. Typically, when manufacturing recording head
105
and playback head
104
, a manufacturing error of 100 to 200 &mgr;m exists. This manufacturing error is illustrated in FIG.
5
. In
FIG. 5
, playback head
4
is positioned on head base plate
13
adjacent to recording head
5
. Playback head
4
has a height d
1
from baseplate
13
. Likewise, recording head
5
has a height d
2
from baseplate
13
. As can be seen, height d
2
is greater than height d
1
. If heads
4
and
5
are energized against film
3
by merely applying energy directly towards film
3
, recording head
5
will make contact with film
3
while playback head
4
does not. As a result, consistency of playback and recording of information is diminished.
BRIEF SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a magnetic head device that improves consistency in recording and playing back magnetic information of a film.
It is a further object of the present invention to provide a camera that enables both a playback head and a recording head to make contact with a film when the recording head has a height that is not equal to a height of the playback head.
Objects of the invention are achieved by a magnetic head device to read and record information from a magnetic recording section of a film, including a recording head to record information from the magnetic recording section of the film; a playback head to read recorded information from the magnetic recording section of the film; a head base plate to position the recording head adjacent to the playback head; a first rotation shaft that extends in the moving direction of the film, a second rotation shaft that extends in a width direction of the film; and a support unit to rotatably support the head base plate about the first and second rotation shafts.
Further objects of the invention are achieved by a magnetic head device to read and record information from a magnetic recording section of a film, including a recording head to record information in the magnetic recording section of the film; a playback head to read information in the magnetic recording section of the film; a head base plate to position the recording head adjacent to the playback head; a first rotation shaft that extends in a width direction of the film; a pad base plate that rotates about the first rotation shaft; and a flexible pad positioned across adjacent from the recording head and the playback head by the new base plate, the film being positioned between the recording and playback heads and the flexible pad.
Even further objects of the invention are achieved by a magnetic head device to read and record information from a magnetic recording section of a film, including a recording head to record information in the magnetic recording section of the film; a playback head to read recorded information from the magnetic recording section of the film; a head base plate to position the recording head adjacent to the playback head; a first rotation shaft that extends in a moving direction of the film, a second rotation shaft that extends in a width direction of the film; a guide rod that extends in the width direction of the film to rotatably support the head base plate about the first and second rotation shafts; and a spring to impart energy toward the film to rotate the head base plate about the first and second rotation shafts.
REFERENCES:
patent: 4628386 (1986-12-01), Chabrolle
patent: 5018034 (1991-05-01), Tanaka et al.
patent: 5191198 (1993-03-01), Do
patent: 5703737 (1997-12-01), Katohno et al.
Nikon Corporation
Sniezek Andrew L.
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