JPH0486639A - Camera using film with magnetic memory - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a camera that uses a film with a magnetic storage section that is equipped with a magnetic head that writes information to or reads information from a magnetic storage section provided on the film. .

(Background of the Invention) In recent years, films equipped with a magnetic storage section are used, and photographic information such as shutter speed, aperture value, year, month, date, title, etc. is written in this magnetic storage section using a magnetic head, and when necessary. A camera that reads out photographing information of a lever has been proposed in US Pat. No. 4,864,332 and the like.

However, in the above conventional example, for example, the magnetic storage section is disposed at a predetermined position in the longitudinal direction of the film,
Coupled with the amount of information to be written and read, the magnetic head must always be accurately positioned at the predetermined position on the film.

However, since the film rolls up and down the screen while being fed, the following problems have occurred.

l) Since a positional shift occurs between the magnetic storage section of the film and the magnetic head, accurate writing or reading of photographic information is not possible.

2) The magnetic head needs to be brought into contact as perpendicularly as possible to the running direction of the magnetic storage portion of the film, but due to the aforementioned waviness of the film, the perpendicularity of the magnetic gap of the magnetic head to the running direction of the film is reduced. Resulting in.

In view of this point, several measures have been taken in the past.

For example, one example is one in which two guide portions are provided at both ends of the pressure plate.
This will be explained with reference to Figure 3.

As shown in FIG. 11, guide portions 1 are provided at both ends of the pressure plate 107.
07c and 107d, which are urged upward by a spring (not shown), and the lower end surface of the fed film comes into contact with the guide parts 107c and 107d, regulating the relative position of the magnetic head 108 and the magnetic storage part. Then, the magnetic head 10
8 and a magnetic storage section provided at a predetermined position on the film with high precision.

FIG. 12 is a plan view of the magnetic head 108 seen from the magnetic gap side. At the waist, 109a and 109b are screw holes for fixing to the pressure plate 107, 109c and 109d are positioning holes, and the mounting is to the plate 109. The magnetic head 08, which is fixed by welding or the like, is attached to the pressure plate 10 as shown in FIG.
7 with screws 110 and 111. 107.
e107f is a tapped hole for the screws 110 and 111, 1
07g and 107h are positioning dowels, and the dowels are 107g.
, 107h is installed through the positioning hole 109c of the plate 109,
109d, and position the magnetic head 1'08 with respect to the pressure plate 1077.

Here, the distance from the center of the magnetic gap of the magnetic head 108 to the positioning holes 109c and 109d is DI (first
2), and the distance between the positioning dowels 107g, 107h and the guide portions 107c, 107d is D2.

When attaching the plate 109 and the magnetic head 108, spot welding is performed while observing with a microscope or the like, so that Dl can be kept within an error of about 0.03 mm. Further, the dimensional accuracy of D2 is usually about ±0.03 mm. Therefore, the magnetic gap and the guide portions 107c, 1
07d, that is, the relative position between the magnetic head 108 and the magnetic storage portion of the film is about ±0.06 mm.

As a second measure, there is a method in which the magnetic head or mounting plate is provided with, for example, two film regulating portions, as shown in FIGS. 14 to 16.

FIG. 14 shows a case where dowels 208a and 208b that contact the end surface of the film are welded to the magnetic head 208.
FIG. 15 shows the case where the magnetic head 308 is formed with a rib 308b for contacting the film end surface, and FIG. 16 shows the case where the magnetic head 308 is provided with a dowel 409a that contacts the film end surface.
409b is formed.

In addition, in these figures, 208a, 308a, 40
8a is a magnetic gap, 209 and 309 are mounted on a plate, D3
is the distance from the magnetic gap 308a to the dowels 208b and 208c, and D4 is the distance from the magnetic gap 308a to the rib 308.
b, the distance D5 is from the magnetic gap 408a to the dowel 4
09a.

409b.

In these cases, the above D3. D4. For D5, spot welding is performed while observing with a microscope, etc., and the error is ±0.
It can be kept within about 0.3 mm.

In other words, the relative position between the magnetic heads 208 308 408 and the magnetic storage portion of the film is approximately ±0.03 mm.

However, the distance, ,L2. Because L3 is short, it is difficult to position the magnetic gap perpendicular to the film running direction. For example, taking FIG. 14 as an example, Ll
is about 5 mm, and if the mutual difference in the dimension D3 between the dowels 208b and 208c and the magnetic gap is ±(], 003 m,
A tilt of ±0.34° occurs.

(Object of the Invention) An object of the present invention is to solve the above-mentioned problems, and to provide a magnetic storage unit that can significantly improve the positional relationship and perpendicularity accuracy between the magnetic storage unit provided in the film and the magnetic head. An object of the present invention is to provide a camera using film.

(Features of the Invention) In order to achieve the above object, the present invention has a film that is sandwiched between the camera body and the camera body, so that the film can be moved in a direction perpendicular to the film running direction and can be rotated on a plane parallel to the film surface. The pressure plate has a guide part that comes into contact with one end surface in the width direction of the film, and a guide part that comes into contact with one end surface in the width direction of the film similarly to the guide part. a magnetic head fixed to the pressure plate that writes or reads information by slidingly contacting the provided magnetic storage unit; The film is sandwiched between the film and the camera body, and is movable in a direction perpendicular to the film running direction and rotatable on a plane parallel to the film surface. A pressure plate having a guide portion that contacts one end surface in the width direction of the film; a magnetic head mounting member having a guide portion that contacts one end surface in the width direction of the film similarly to the guide portion; The magnetic head is attached to the magnetic head fixed to the pressure plate through a member, and the respective guide portions are attached to one side in the width direction of the film. and an elastic member that biases the pressure plate in that direction so as to come into pressure contact with the end face, so that the elastic member allows the guide portion provided on the pressure plate and the guide portion provided on the magnetic head to be connected to the film. The film is pressed against one end surface in the width direction so that the film, the pressure plate, and the magnetic head each move integrally.

(Embodiment of the Invention) FIGS. 1 to 7 show an embodiment of the present invention. FIG. 1 is a rear view of the camera with the back cover omitted, and FIG. 2 is a rear view of the camera shown in FIG. A cross-sectional view, Figure 3 is a cross-sectional view taken along line B-B in Figure 1, and Figure 4.
The figure is a front view of the pressure plate and the magnetic head seen from the film surface side, Figure 5 is a perspective view of the pressure plate showing the magnetic head and the magnetic head mounting part, and Figure 6 is a rear view showing the state in which the magnetic head is attached to the pressure plate. , FIG. 7 is a rear view of the camera showing the positional relationship between the pressure plate and the film.

In these figures, 1 is a camera body, 2 is a cartridge chamber for storing the film cartridge 10 (see FIG. 7), 3 is a film feeding fork that engages with the shaft (not shown) of the film cartridge 10, Reference numeral 4 denotes a film spool for winding up the film 11 having a magnetic storage section (not shown); 5.6 denotes support shafts each having both ends fixed to appropriate positions on the camera body 1; the support shafts 5.6 are parallel to each other; and is arranged perpendicularly to the running direction of the film 11. The support shaft 5.6 in this embodiment has a cylindrical shape with a circular cross section as shown in FIG.

7 is a pressure plate, and its upper surface (the surface opposite to the surface that contacts the film 11) has a pair of locking portions 7a as shown in FIG.
7b is provided. The locking portions 7a and 7b consist of a vertical portion perpendicular to the pressure plate 7 and a horizontal portion bent outward at a right angle from the vertical portion, and have an abbreviated cross-sectional shape, and protrude as a whole in the optical axis direction. (See Figure 2). Note that, as shown in FIG.
They are arranged in an arc shape at symmetrical positions about the approximate center of the .

Here, the distance A2 between the outer vertical parts of the locking parts 7a and 7b
(See Figure 2) is the distance β between the inner sides of the support shaft 5.6.
1 (see Fig. 1), and the support shaft 5.6 is connected to the vertical and horizontal parts of the locking parts 7a and 7b and the pressure plate 7.
It is located in a concave space between.

Therefore, the pressure plate 7 is movable in the vertical direction in FIG. ing. Further, the horizontal portions of the locking portions 7a and 7b sandwich the support shaft 5.6, as shown in FIG. 2, and regulate the front and rear positions of the pressure plate 7 in the optical axis direction.

Further, as shown in FIG. 4, on the film surface side of the pressure plate 7, there are provided a guide portion 7C and a film introduction portion 7d, which have a tapered surface that widens toward the cartridge chamber 2 side and come into contact with the end surface of the film.

Further, a magnetic head 8 is fixed to a position below the pressure plate 7 via a plate 9 with screws or the like.

The magnetic head 8 is provided with a magnetic gap 8a and a dowel 8c, and the mounting plate 9 is provided with a dowel 7e of the pressure plate 7.
, 7f (see FIG. 6) to position the magnetic head 8 with respect to the pressure plate 7.
It has b.

12 and 13 are springs each having one end attached to the pressure plate 7 and the other end attached to the camera body 1, and biasing the pressure plate 7 upward in FIG.

When there is no film 11, the pressure plate 7 acts as a stopper la of the camera body 1, as shown in FIG.

It is in contact with 1b.

It should be noted that the film introducing portion 7d provided on the pressure plate 7 is slightly smaller than the straight line connecting the film contacting surface of the guide portion 7c and the dowel 8c of the magnetic head 8 as shown in FIG. It is formed downward as shown.

Film cartridge 9 stored in cartridge chamber 2
The film 11 pushed out first contacts the tapered surface of the guide portion 7c, pushes the pressure plate 7 downward against the urging force of the spring 12.13, and as it is further fed, the tapered surface of the film introducing portion 7d The dowel 8c of the next magnetic head 8 touches the film 11 and pushes the pressure plate 7 downward.
Helps it smoothly enter the lower end surface of the. When the film 11 is further fed, the spring 12.1
3, the lower end surface of the film and the guide portion 7 of the pressure plate 7
c and the dowel 8C of the magnetic head 8 are always in contact with each other, and even if the film 11 undulates or tilts up and down during running, the positional relationship of the pressure plate 7 and the magnetic head 8 with respect to the film 11 is maintained as shown in FIG. is constructed so that it always remains constant. As described above, a magnetic memory portion is formed on the surface of the film 11 on the pressure plate 7 side, and the film 11
While the image is being fed, the magnetic head 8 writes or reads various information related to photographing.

In the above configuration, the back cover (not shown) pivotally attached to one end of the camera body 1 is opened by the photographer, and the film cartridge 10 is loaded into the cartridge chamber 2. As shown in Japanese Patent Application No. 63-220049, such a film cartridge 1o is such that when not in use, the entire film piece including the film league portion is housed in the cartridge, and the cartridge 1o is placed inside the camera body 1. The film 11 is not pushed out of the cartridge 10 until it is loaded, the back cover is closed, and driving force is transmitted from the film feeding fork 3.

In the above-described state, when the film feeding fork 3 is rotated clockwise in FIG. 2 by a motor (not shown), the film cartridge 1 engaged with the fork 3 is rotated.
0 axis (not shown) rotates in the same direction. Therefore, the film 11 is pushed out of the cartridge lo, and its leader portion enters the gap G between the pressure plate 7 and the camera body 1 (see FIG. 2). As film 11 moves further to the right in FIG. 1, spring 12.
13 causes the guide portion 7c and the dowel 8c of the magnetic head 8 to come into contact with the lower end surface of the film 11.
The positions of the pressure plate 7 and the magnetic head 8 are regulated relative to each other.

During this process, the film 11 passes the position of the magnetic head 8, so the magnetic gap 8a of the magnetic head 8 comes into sliding contact with the magnetic storage section (not shown) of the film 11, making it possible to write or read photographic information. . Finally film 11
The league portion at the tip of is wound around the film spool 4. Thereafter, the film 11 is wound only by the rotation of the film spool 4 by a motor (not shown), which is similar to a known camera.

Note that even if undulation occurs in the film 11 during film feeding, the pressure plate 7 can be moved perpendicular to the film running direction with respect to the camera body 1 and can be rotated on a plane parallel to the film surface. Therefore, it is possible to accurately follow the undulations. At this time, the magnetic head 8 is integrated with the pressure plate 7, and the guide portion 7c provided on the pressure plate 7 and the dowel 8c of the magnetic head 8 are constantly in contact with the lower end surface of the film due to the springs 12 and 13, so that the film can run smoothly. The perpendicularity of the magnetic gap 8a with respect to the direction and the planar relative position with respect to the film 11 can be maintained with high precision.

Here, the point where the above effects can be obtained will be explained in further detail using FIG. 4.

In FIG. 4, D6 is from the magnetic gap 8a to the dowel 8c.
D7 is the distance from the magnetic gap 8a to the positioning holes 9a, 9b, D8 is the vertical distance from the positioning dowels 7e, 7f to the guide part 7C,
C4 is the distance in the left-right direction from the magnetic gap 8a to the dowel 8C, and f25 is the distance in the left-right direction from the magnetic gap 8a to the guide portion 7c. Also, the dimensional error of the distance D6 is ΔD6. Assuming that the dimensional error of D7 is ΔD7 and the dimensional error of D8 is ΔD8, in the eighth, the slope θ1 is, and as an example, ΔD6+ΔD7+ΔD8 is "±0.
03mmj, I24 to r3mmJ, fis to r43mm
If J, θ1=0.129'...
・・・・・・・・・■Also, tanθ1=0.0022
5, sin θ, =0.00225.1/cos θ,
= 1.0000025, so the distance M is (D6+△D6) cos θ1) sin θ1
→D6+ΔD6+β4xO, 00225. Therefore, the error D6-M is D6-M=ΔD6+I24xO,00225=0.
03+ 0.00675 = 0.03675 ・・・・・・・・・
...■, and the relative position between the magnetic gap 8a and the magnetic storage part of the film 11 is "±0.0367" as in the above ■.
5", and the conventional example shown in FIGS. 11 to 13 ("
It can be seen that the accuracy is better than that of ±0.06J). Furthermore, if β4 is set to rOJ, the error (D 6-M)
is ``±0.03J.

Also, from the above (■), since the slope θ1 is maximum "±0.129°", the conventional example shown in FIGS. 14 to 16 (±0.
．． 346), it can be seen that the verticality is maintained much better.

Figures 9 and 10 show other embodiments of the present invention; Figure 9 is a perspective view of the magnetic head and pressure plate, and Figure 10 is a back view of the magnetic head with the pressure plate attached. be.

In this embodiment, a dowel 24 is provided near the magnetic gap 22a, that is, a dowel 24 for abutting the magnetic gap 22a and the lower end surface of the film.
Attach the dowel 24 to the plate 2 while observing it with a microscope or the like while keeping the distance in the vertical direction of the drawing short (narrowing the interval).
3. Good accuracy due to welding etc. (shown when installed).

If this can be realized, effects similar to those of the embodiments described above can be obtained. Note that 21 is a pressure plate, and 25 and 26 are screws for mounting.

According to this embodiment, a magnetic head is fixed to a pressure plate, and the pressure plate is movable perpendicularly to the film running direction and rotatable on a plane parallel to the film surface, and furthermore, the pressure plate and the magnetic head are attached to each other. The guide section that regulates the position of the film (
Since these guide parts are pressed against the film end face by means of an elastic member (spring), the distance from the film end face to the magnetic head 8 can always be kept constant, and the magnetic head (magnetic gap) This makes it possible to accurately maintain perpendicularity between the film and the film running direction.

(Effects of the Invention) As described above, according to the present invention, the elastic member presses the guide portion provided on the pressure plate and the guide portion provided on the magnetic head against one end surface in the width direction of the film. Since the film, pressure plate, and magnetic head are made to move integrally, it is possible to greatly improve the accuracy of the positional relationship and perpendicularity between the magnetic storage section provided in the film and the magnetic head.

[Brief explanation of the drawing]

FIG. 1 is a rear view of a camera showing one embodiment of the present invention, and FIG.
The figure is a sectional view taken along line A-A shown in Figure 1, and Figure 3 is a cross-sectional view taken along line B-- shown in Figure 1.
B sectional view, FIG. 4 is a front view of the pressure plate and magnetic head seen from the film surface side in one embodiment of the present invention, FIG. 5 is a perspective view of the pressure plate of the magnetic head and the magnetic head mounting portion, and The figure is a rear view showing a state in which the magnetic head is attached to the pressure plate, FIG. 2 is a rear view of the camera showing the positional relationship between the pressure plate and the film, and FIG. 8 is for explaining the effect of an embodiment of the present invention. , FIG. 9 is a perspective view of the magnetic head and magnetic head mounting portion of the pressure plate in another embodiment of the present invention, FIG. 10 is a rear view showing the magnetic head mounted on the pressure plate, and FIG. 11 12 is a front view showing the relationship between a conventional pressure plate and a magnetic head, FIG. 12 is a front view showing the relationship between the magnetic head and the plate, and FIG. 13 is a front view showing how the magnetic head is attached to the pressure plate. FIGS. 14 to 16 are perspective views showing other examples of conventional mounting, showing the relationship between the plate, the magnetic head, and the member for contacting the lower end surface of the film. l... Camera body, 5.6... Support shaft, 7... Pressure plate, 7c... Guide member,
8... Magnetic head, 8a... Magnetic gap, 8c... Dowel, 9... Mounting plate, 11... Film, 12 .13...
spring. 21...Press plate, 22...
Magnetic head, 22a...Magnetic gap, 23.
...Mounting is done with a board, 24...dowels.

Claims (2)

[Claims] (1) Insert the film into the gap between the camera body and
A pressure plate that is movable in a direction perpendicular to the film running direction and rotatable on a plane parallel to the film surface, and has a guide portion that comes into contact with one end surface in the width direction of the film; a magnetic head fixed to the pressure plate, the magnetic head having a guide portion in contact with one end surface in the width direction, and writing or reading information by slidingly contacting a magnetic storage portion provided on the film during film feeding; A camera using a film with a magnetic memory section, comprising an elastic member that urges the pressure plate in that direction in order to press each guide section against one end surface in the width direction of the film. (2) Insert the film into the gap between the camera body and
A pressure plate that is movable in a direction perpendicular to the film running direction and rotatable on a plane parallel to the film surface, and has a guide portion that comes into contact with one end surface in the width direction of the film; A magnetic head mounting member having a guide portion that contacts one end surface in the width direction, and a magnetic head mounting member that writes or reads information by slidingly contacting a magnetic storage portion provided on the film during film feeding. a magnetic head that is fixed to the pressure plate; and an elastic member that biases the pressure plate in that direction in order to press the respective guide portions against one end surface in the width direction of the film. Camera used.