JPH04114137A - Camera using film with magnetic storage part - Google Patents

Abstract

PURPOSE:To obtain this small-sized and inexpensive camera by providing magnetic heads which are integrally formed with a pressing plate so that the pressing plate and a magnetic gap part have the same plane. CONSTITUTION:The magnetic heads 2 is arranged inside the pressing plate 1 so that the film contact surface of the magnetic heads 2 are on the same plane as that of the pressing plate 1, and they are integrally formed. On the other hand, a shielding plate 3 is also integrally formed with the pressing plate 1, similarly, arranged between the magnetic heads 2a and 2b, and has functions for preventing mutual interference of the magnetic heads 2a and 2b. Thus, the magnetic heads 2 carrying out writing/reading into/from the magnetic storage part of the film can be integrally formed, thereby the small-sized and inexpensive camera is obtained.

Description

Detailed Description of the Invention (Field of Application of the Invention) The present invention relates to a film with a magnetic storage section that is equipped with a magnetic head that records and reproduces information such as shutter speed and aperture in a magnetic storage section of the film. This relates to improving the camera used.

(Background of the Invention) In recent years, films having a magnetic storage area are used, and shooting information such as shutter speed, aperture value, shooting date, title, etc. is written in this magnetic storage area using a magnetic head, and when necessary, A camera designed to read out this information has been proposed in US Pat. No. 4,864,332 and other publications.

However, in the above-mentioned conventional example, the magnetic head is constructed separately from the pressure equalizing plate which is fixed with screws or the like, and therefore the number of parts to be assembled increases and the shape becomes large. Furthermore, much time is required for assembly and adjustment.

In addition, there have been problems in that the film is damaged and the azimuth accuracy (perpendicularity between the magnetic gap and the longitudinal direction of the magnetic storage section) is deteriorated due to misalignment between the pressure plate and the magnetic head.

(Object of the Invention) An object of the present invention is to solve the above-mentioned problems and to provide a camera using a film with a magnetic storage unit that can be made small and inexpensive.

(Features of the Invention) In order to achieve the above object, the present invention provides a pressure plate made of a synthetic resin material that maintains the flatness of the film, a film contacting surface of the pressure plate, and a magnetic storage unit provided in the film for writing information. The present invention is characterized by comprising a magnetic head integrally molded with the pressure plate so that the pressure plate and the magnetic gap portion for reading are on the same plane, and the pressure plate and the magnetic head are integrally molded.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail based on illustrated embodiments.

1 and 2 show a first embodiment of the present invention, FIG. 1 is a perspective view showing a pressure plate and a magnetic head, and FIG.
The figure is a sectional view taken along the line AA in FIG.

In these figures, 1 is a pressure plate made of synthetic resin, 2
(2a, 2b) are magnetic heads, and 3 is a shield plate.

The magnetic head 2 is arranged in the pressure plate 1 so that its film contact surface is flush with the film contact surface of the pressure plate 1, and these are integrally molded. Also, shield plate 3
is similarly molded integrally with the pressure plate 1, and the magnetic head 2
a and 2b, these magnetic heads 2a and 2b
It has the function of preventing mutual interference.

In this way, by integrally forming a pressure plate with the magnetic head 2 that writes to and reads from the magnetic storage section (not shown) of the film, the device can be made smaller and less expensive.

3 and 4 show a second embodiment of the present invention, in which FIG. 3 is a perspective view showing a pressure plate and a magnetic head, and FIG. 4 is a perspective view showing a pressure plate and a magnetic head.
The figure is a sectional view taken along line BB in FIG.

The difference from the first embodiment described above is that metal plating 4 is applied around the pressure plate 1.

The shield plate 3 and metal plating 4 are connected to each other,
The magnetic heads 2a and 2b are shielded. This makes it possible to reduce external noise applied to the magnetic head, and to more accurately write information to or read information from the magnetic storage section of the film.

Furthermore, in cameras with a high frame rate, static electricity is generated when the film and the pressure plate made of synthetic resin rub against each other, which discharges and leaves marks called static marks on the film surface. With the above configuration, this can be prevented.

5 and 6 show a third embodiment of the present invention, FIG. 5 is a perspective view showing a pressure plate and a magnetic head, and FIG. 6 is a perspective view showing a pressure plate and a magnetic head.
The figure is a sectional view taken along the line CC in FIG.

Further, the same parts as in FIGS. 1 to 4 above are given the same reference numerals.

In this embodiment, small smooth protrusions 5 are provided on the surface of the pressure plate 1 to reduce the contact area between the pressure plate 1 and the film, and the heights of the protrusions 5 are all made to be the same. There is. Further, the protrusion 5 and the magnetic head 2 are integrally molded so as to have the same height as shown in FIG.

By configuring as described above, the contact area between the film and the pressure plate 1 is reduced, making it possible to lighten film feeding and to reduce the generation of static electricity.In addition, the film and the magnetic head 2 are brought into close contact with each other. can be done.

7 and 8 show a fourth embodiment of the present invention, FIG. 7 is a perspective view showing a pressure plate and a magnetic head, and FIG. 8 is a perspective view showing a pressure plate and a magnetic head.
The figure is a sectional view taken along the line DD in FIG.

Further, the same parts as in FIGS. 1 to 6 above are given the same reference numerals.

In this embodiment, a concave portion 6 is provided in the pressure plate 1 in order to obtain substantially the same effect as in the third embodiment.

According to each of the above embodiments, the film contact surface of the pressure plate 1 and the film contact surface of the magnetic head 2 (magnetic gap portion where information is written or read) are integrally molded so that they are on the same plane. In addition, even if the camera is dropped or some strong impact is applied to the camera, the azimuth between the magnetic head and the film (magnetic storage section) will not shift. It becomes possible to always write or read information with high accuracy.

Furthermore, by covering the surface of the pressure plate 1 with a conductive material, it is possible to prevent negative effects on the film surface due to static electricity (static marks, etc.), and furthermore, it is possible to remove external noise applied to the magnetic head 2. It becomes possible.

(Effects of the Invention) As explained above, according to the present invention, there is provided a pressure plate made of a synthetic resin material that maintains the flatness of the film, and information writing to the film contacting surface of the pressure plate and the magnetic storage section provided in the film. and a magnetic head integrally molded with the pressure plate so that the magnetic gap portion for reading is on the same plane, and since the pressure plate and the magnetic head are integrally molded, a compact and inexpensive camera is provided. It becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a pressure plate and magnetic head according to a first embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 3 is a perspective view of a pressure plate according to a second embodiment of the present invention. and a perspective view of the magnetic head, FIG. 4 is a sectional view taken along the line B-B in FIG. 3, FIG. 5 is a perspective view of the pressure plate and magnetic head according to the third embodiment of the present invention, and FIG. -C sectional view, FIG. 7 is a perspective view of a pressure plate and magnetic head according to a fourth embodiment of the present invention, and FIG. 8 is a sectional view taken along line DD in FIG. 7. ■...Press plate, 2...Magnetic head, 4.
...Metal plating, 5...Protrusion, 6...
...concavity.

Claims (1)

[Claims] (1) A pressure plate made of a synthetic resin material that maintains the flatness of the film, so that the film contacting surface of the pressure plate and the magnetic gap part where information is written and read from the magnetic storage section provided in the film are on the same plane. A camera using a film with a magnetic storage unit, which includes a magnetic head integrally molded with the pressure plate.