Photography – With data recording – Magnetically on film or film cassette
Reexamination Certificate
1999-01-27
2001-07-24
Gray, David M. (Department: 2851)
Photography
With data recording
Magnetically on film or film cassette
C396S440000
Reexamination Certificate
active
06266489
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a photo film support device and a magnetic head securing method for the same. More particularly, the present invention relates to a photo film support device and a magnetic head securing method for the same in which a magnetic head can be precisely secured to the photo film support device with great ease.
2. Description Related to the Prior Art
A known type of photo film has a magnetic recording layer, which consists of a coating applied to a surface reverse to photographic emulsion, and to which information is magnetically recordable. Predetermined photo film information is recorded to the magnetic recording layer, and includes frame numbers, photo film sensitivity, the number of available frames, product name and the like. In taking an exposure, those kinds of information are read and used for conditioning the exposure. Also information of a particular condition determined for each exposure is recorded to the magnetic recording layer.
A camera for use with the photo film having the magnetic recording layer is provided with a magnetic head for the purpose of magnetic recording and reading. The magnetic head is fixedly secured to a photo film support plate, which supports a back surface of the photo film positioned in an exposing station, and keeps the photo film flat. For the magnetic recording and reading with the magnetic recording layer in an exact manner, it is essential to stabilize pressure in contact of the magnetic head with the magnetic recording layer.
FIG. 18
is now referred to, and the magnetic head and its relevant structure in the camera are described. The camera has an exposure aperture which defines a region to be exposed on photo film
211
. There is a photo film support plate
213
or pressure plate disposed behind the exposure aperture. The photo film support plate
213
supports the photo film
211
in contact with a back surface of the photo film
211
positioned on the exposure aperture, to keep an imaging frame flat. A magnetic recording layer is formed by applying a coating of magnetic material to the back surface of the photo film
211
, which is opposed to the photo film support plate
213
. A magnetic head
215
is secured to the photo film support plate
213
, and contacts the magnetic recording layer of the photo film
211
to record information to and/or read information from a magnetic recording area.
In
FIG. 18
, the magnetic head
215
is positioned to protrude forward from a head base plate
216
. The photo film support plate
213
has an opening
217
through which the magnetic head
215
is disposed. The head base plate
216
is kept so positioned that the magnetic head
215
projects from the opening
217
at a predetermined projecting amount A experimentally obtained for the magnetic head
215
to give suitable pressure to the magnetic recording layer of the photo film
211
. When the head base plate
216
is positioned, adhesive agent
218
is applied to the head base plate
216
and the photo film support plate
213
to extend from the rear face of the head base plate
216
to the rear face of the photo film support plate
213
. The adhesive agent
218
is hardened and forms an adhesive layer in a certain spread area, to secure the head base plate
216
fixedly to the photo film support plate
213
. There are plural positions on the periphery of the head base plate
216
where the adhesive agent
218
is applied.
To pour the adhesive agent
218
, the head base plate
216
and the photo film support plate
213
are kept positioned with their rear directed upwards. The adhesive agent
218
is applied to overlapped portions between the head base plate
216
and the photo film support plate
213
. An example of the adhesive agent
218
is an ultraviolet cure type which has a characteristic which is ordinarily fluid and hardened in response to application of ultraviolet rays.
There is a problem in the method of pouring the adhesive agent
218
on the rear faces of the photo film support plate
213
and the head base plate
216
, in that the adhesive agent
218
flows to change an area where the adhesive agent
218
spreads. As the head base plate
216
itself has a relatively small area of the surface, the adhesive agent
218
comes to have an appearance giving a poor impression, because plural layers of the adhesive agent
218
overlap on one another when the adhesive agent
218
is spread on the rear of the head base plate
216
. Furthermore, the spread area of the adhesive agent
218
is likely to be larger than is sufficient. The used amount of the adhesive agent
218
is wastefully large. An amount of the adhesive agent
218
to be poured for one time may be predetermined to avoid the excessive use of the adhesive agent
218
. However another problem occurs in that the adhesive agent
218
is poured in an unacceptable position offset to the photo film support plate
213
. A spread area defined by the adhesive agent
218
on the head base plate
216
may become extremely small, to lower the strength of fixing the head base plate
216
to the photo film support plate
213
.
SUMMARY OF THE INVENTION
In view of the foregoing problems, an object of the present invention is to provide a photo film support device and a magnetic head securing method for the same in which a magnetic head can be reliably secured to the photo film support device with great ease.
Another object of the present invention is to provide a photo film support device and a magnetic head securing method for the same in which adhesive agent is prevented from overflowing rearwards from a head base plate.
An additional object of the present invention is to provide a photo film support device and a magnetic head securing method for the same in which an assembly machine for those can be simply constructed without extremely difficult adjustment.
Still another object of the present invention is to provide a photo film support device which consists of a plate of metal and which can be produced with great efficiency.
In order to achieve the above and other objects and advantages of this invention, a photo film support device is incorporated in a camera, for supporting a back of photo film, the photo film having a magnetic recording area. The photo film support device includes a photo film support plate. An opening is formed in the photo film support plate. A magnetic head is disposed to project forwards from inside the opening, for recording information to and/or reading information from the magnetic recording area. A head base plate is mounted on a rear face of the photo film support plate to cover the opening, for supporting the magnetic head. Adhesive agent is applied to at least one portion of the periphery of the head base plate, and hardened for securing the head base plate to the photo film support plate. At least one recess or at least one projection is disposed on a periphery of the head base plate and/or on a rear face of the head base plate in a vicinity of the periphery, the adhesive agent being disposed to extend from a front face of the head base plate to a surface of the recess or the projection, the recess or the projection enlarging a contact area between the adhesive agent and the head base plate.
In a preferred embodiment, the at least one portion of the periphery of the head base plate includes first and second edges opposite to each other, and the at least one recess or the at least one projection is located on the first and second edges.
The at least one recess is first and second recesses, formed in the head base plate by cutting a rear end of the first and second edges.
The head base plate further has first and second projection trains, respectively including plural projections, disposed on an inside of the first and second recesses to project toward the periphery.
In another preferred embodiment, the at least one projection is first and second projection trains, respectively including plural projections, disposed on the first and second edges to project from the head b
Kimura Soichiro
Sasaki Wataru
Takahashi Teruo
Fuji Photo Film Co. , Ltd.
Gray David M.
Sughrue Mion Zinn Macpeak & Seas, PLLC
LandOfFree
Photo film support device and magnetic head securing method... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photo film support device and magnetic head securing method..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photo film support device and magnetic head securing method... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2532000