JP3352545B2 - Pressure plate unit in camera using magnetically storable film and camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head for writing / reading information to / from a magnetic storage section provided on a film and a still camera provided with the magnetic head.

[0002]

2. Description of the Related Art In recent years, a camera system has been developed which uses a film having a magnetic storage unit so that camera-side information such as photographing conditions can be written to or read from the magnetic storage unit. The camera-side information includes a shutter speed, an aperture value, a date, a title, and the like. A magnetic head is used to write or read the information. As described above, since certain information can be recorded on a film as needed by a magnetic method, examples of effective and effective applications of such a system include, for example,
It is applicable to multimedia devices using the obtained photographic images, and is expected to be promising in the future.

FIG. 5 shows an example of a schematic structure of such a camera.
Reference numeral 1 denotes a lens barrel; 102, a film cartridge loaded in the camera body 100; 103, a film drawn from the film cartridge 102;
It is wound up in 05. 106 is a film 103
Guide rail portion 107 for guiding the vehicle 103 along a predetermined traveling path,
And a pressure plate 107 for supporting the magnetic head 1 described later for writing or reading information so as to be accessible to the film 103. The pressure plate 107 is a pressure plate spring 1
08, it is elastically supported by the camera body 100.

The magnetic head 1 is mounted on, for example, a corner of the pressure plate 107 as shown in FIGS. The magnetic head 1 is arranged at an end of the film 103 so as to correspond to a magnetic storage unit 103a provided along the longitudinal direction, and is slidably contacted by the pressure plate 107 with the magnetic storage unit 103a. . Then, shooting information can be written or read at a predetermined timing for each shooting frame of the running film 103.

When the magnetic head 1 is mounted on the pressure plate 107, for example, the magnetic head 1 is mounted in a mounting hole 2 formed in the pressure plate 107 as shown in the figure, and the head 1 a of the magnetic head 1 is exposed from the opening 3. The base 1b of the magnetic head 1 is fixed to the pressure plate 107 using screws 4 or the like. As is clear from the figure, in this example, the mounting hole 2 is formed to be slightly larger than the outer shape of the magnetic head 1. In this case, it is extremely important to position and fix the magnetic head 1 so that the magnetic storage unit 103a of the film 103 and the magnetic head 1 are in proper sliding contact with each other and conform to the flatness of the film 103. It is.

[0006]

6 and 7, the gaps Gx and Gy around the head 1a of the magnetic head 1 are considerably large. Has become something. The photographic information signal is electrically converted between the magnetic head 1 and the film 103. In particular, the azimuth of the magnetic head 1 significantly affects its conversion characteristics. For this purpose, position adjustment of the magnetic head 1 is performed.
Since x and Gy are large, the position adjustment work has to be considerably troublesome. Also, the magnetic head 1
It is also difficult to obtain high positioning accuracy.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to realize a magnetic head and a pressure plate unit thereof which enable easy and accurate positioning, and particularly facilitate azimuth adjustment.

[0008]

SUMMARY OF THE INVENTION A pressure plate unit according to the present invention is mounted on a camera using a film capable of magnetic storage, and writes or reads information on or from the magnetic storage unit by slidingly contacting the film having a magnetic storage unit. A pressure plate unit comprising a magnetic head mounted on a pressure plate, the magnetic head comprising: a base having a notch for adjusting azimuth; A head whose cylindrical side portion is cut perpendicularly to the base at a position symmetrical with respect to the center axis of the cylinder, and wherein the pressure plate has a cylindrical circumferential portion of the head of the magnetic head. The magnetic head has a notch portion corresponding to the notch portion at a position different from the opening portion, and a clearance portion for adjusting the azimuth with respect to the magnetic head. It is characterized in.

[0009]

The camera according to the present invention can write or read information to or from a magnetic storage unit provided on the film. The magnetic head is brought into sliding contact with the magnetic head so that information can be written to or read from the magnetic storage section of the film by the magnetic head.

[0011]

When the magnetic head is mounted on the pressure plate, the magnetic head is mounted in the mounting hole of the pressure plate and the fitting circumferential portion of the magnetic head is fitted into the opening of the pressure plate. The magnetic head is arranged at a predetermined position on the pressure plate, and is rotatable by a fixed angle, that is, an angle corresponding to the azimuth adjustment at the circumferential portion for fitting. In a pressure plate unit in which a magnetic head is mounted on a pressure plate, for example, a driver or the like is inserted into a cutout of each of the magnetic head and the pressure plate, so that the position of the magnetic head with respect to the pressure plate can be easily adjusted. When mounting the magnetic head on the pressure plate, the magnetic head is provided with a pair of notches at diagonal or point symmetric positions, so it can be easily mounted regardless of the direction or orientation of the magnetic head with respect to the pressure plate. can do.

In a camera having such a pressure plate unit, a magnetic head is slidably contacted with a film drawn from a film cartridge via the pressure plate unit. At the time of this sliding contact, information is written to the magnetic storage portion of the film, but the position adjustment of the magnetic head with respect to the pressure plate, that is, the azimuth adjustment of the magnetic head with respect to the film is easy, and the proper writing or reading of information is guaranteed. can do.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to FIGS.

As shown in FIGS. 1 and 2, the magnetic head 11 of this embodiment corresponds to the magnetic storage section 103a provided along the longitudinal direction at the end of the film 103 at the right corner of the pressure plate 107. Shall be arranged so that
This arrangement relationship and the basic configuration of the pressure plate 107 are the same as those in the conventional example, and the magnetic head 11 is brought into sliding contact with the magnetic storage section 103a by the pressure plate 107.

In FIG. 1 and FIG.
Is mounted in the mounting hole 12 formed in the pressure plate 107. In this case, the head 11 a of the magnetic head 11 is fitted into the opening 13, and the tip end side is exposed to the film 103. As shown in FIG. 3, the shape of the head 11a is basically a cylindrical shape with both sides cut off, and the circumference thereof is fitted to the opening 13 of the pressure plate 107. . Also, the magnetic head 11 that is loosely fitted in the mounting hole 12 of the pressure plate 107.
The base 11b is basically formed in a cylindrical shape concentric with the head 11a and has both sides cut off. The magnetic head 11 fits roughly into the mounting hole 12 on the base 11b side. The magnetic head 11 is fixed to the pressure plate 107 by screws 14,
A relief 15 for the screw 14 is formed in the base 11b (see FIG. 3).

Although the mounting hole 12 and the opening 13 of the pressure plate 107 particularly have a plan shape (FIG. 1) that basically matches the plan shape of the head 11a and the base 11b of the magnetic head 11, As shown in FIG. 1, the head 11a and the base 11b each have an opening 13 corresponding to a cutout portion (flat portion 11c) on both sides and a relief portion 16 formed by expanding a part of the mounting hole 12. ing. This escape part 16
Is inclined at the clearance angle θ with respect to the flat portion 11c, and a constant gap is set between the two. Also, in each flat portion 11c, the center portion and the magnetic head 11
A small gap G1 (a dimensional difference between the outer dimension of the magnetic head 11 and the opening 13) is set between the flat portion 11c and the flat portion 11c.

As shown in FIG. 3, the magnetic head 11 has a notch 17 for adjusting azimuth formed on the base 11b.
have. In this example, a pair of the notches 17 are provided on diagonal lines or at point-symmetric positions as shown in the figure. On the other hand, one notch 18 is formed in the pressure plate 107 corresponding to the notch 17. The notch 18 is formed through the pressure plate 107 as shown in FIG.

In the above case, in the present embodiment, the magnetic head 11
The difference between the diameter d1 (FIG. 3) of the circumference of the head 11a and the diameter D1 (FIG. 1) of the opening 13 is not more than 0.2 mm.
The dimensional difference between the diameter d2 of the circumferential portion of the base 11b and the diameter D2 of the mounting hole 12 is set to 0.2 mm or less. The minute gap G1 shown in FIG.
6 are set to 4 ° or less.

A pressure plate unit is constituted by the magnetic head 11 and the pressure plate 107 to which the magnetic head 11 is attached. The pressure plate unit is incorporated in the camera shown in FIG. 5 as described above, and the magnetic head 11 is slid into contact with the magnetic storage unit 103a by the pressure plate 107 to take a picture at a predetermined timing for each photographing frame of the running film 103. Information can be written or read.

When the magnetic head 11 is mounted on the pressure plate 107, the magnetic head 11 is mounted in the mounting hole 12 of the pressure plate 107 and the head 11a of the magnetic head 11 is fitted into the opening 13. At this time, the azimuth of the magnetic head 11 is aligned with the reference line of the pressure plate 107.
1 is rotatable by the clearance angle θ. Therefore,
Notches 17 of the magnetic head 11 and the pressure plate 107,
For example, as shown in FIG. 4, an appropriate tool 20 such as a screwdriver is inserted into 18 (see arrow B in FIG. 4). Then, by hooking the end of the tool 20 to the notch 17 and finely adjusting the position as shown by the arrow C in FIG. 1, the position (rotational position) of the magnetic head with respect to the pressure plate 107 and thus the film 103 can be easily and accurately adjusted. Can be adjusted.

The specific numerical examples and the like in the above-described embodiments show preferred examples of the present invention, and therefore are not limited only to the numerical values and the like. Also, in particular, the example in which the screw 14 is used to fix the magnetic head 11 to the pressure plate 107 has been described. However, the screw 14 may be fixed using an adhesive or the like.

[0022]

As described above, according to the present invention, in this type of camera, the magnetic head can be easily and accurately positioned with respect to the pressure plate, whereby the azimuth adjustment of the magnetic head can be performed easily and accurately. It can be done accurately. Therefore, there is an advantage that predetermined information can always be appropriately written or read to or from the magnetic storage unit of the film in the camera.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration of a main part of a pressure plate unit according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a pressure plate unit according to the embodiment of the present invention.

FIG. 3 is a plan view of a magnetic head according to the present invention.

FIG. 4 is a sectional view taken along line AA of FIG.

FIG. 5 is a diagram illustrating a configuration example of a camera that can write or read information on a magnetic storage unit of a film.

FIG. 6 is a diagram showing a configuration of a main part of a conventional pressure plate unit.

FIG. 7 is a sectional view of a main part of a conventional pressure plate unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Magnetic head 12 Mounting hole 13 Opening 14 Screw 15 Escape part 16 Escape part 17 Notch part 18 Notch part 100 Camera body 101 Lens barrel 102 Film cartridge 103 Film 104 Guide roller 105 Hoisting spool 106 Guide rail part 107 Pressure plate 108 Pressure plate Spring

Claims (2)

(57) [Claims] A magnetic head attached to a camera using a magnetically storable film and writing or reading information to or from the magnetic storage unit by slidingly contacting the film having the magnetic storage unit is attached to a pressure plate. A pressure plate unit, wherein the magnetic head has a base portion on which a notch portion for adjusting azimuth and a clearance portion for azimuth adjustment with respect to a fixing screw are formed; and a position on the base portion which is axially symmetric with respect to a cylindrical central axis. A head having a cylindrical side portion cut off perpendicular to the base portion, wherein the pressure plate has an opening that fits into a cylindrical circumference of the head of the magnetic head, and the opening A pressure plate unit, comprising: a notch portion corresponding to the notch portion of the magnetic head at a portion different from that of the magnetic head; and a relief portion for adjusting the azimuth with respect to the magnetic head. 2. A camera capable of writing or reading information to or from a magnetic storage unit provided on a film, comprising: a pressure plate unit according to claim 1; A camera, wherein the magnetic head is brought into sliding contact with the magnetic head so that information can be written to or read from a magnetic storage portion of the film by the magnetic head.