JPH03202830A - Camera used with film provided with magnetic storing part - Google Patents

Abstract

PURPOSE:To accurately write and read out information by making it possible to vertically move a pressure plate to a film traveling direction and also making it possible to turn the pressure plate on a surface parallel with a film surface, and moving information while being rubbed in contact with the magnetic storing part when the film fixed to the pressure plate is fed. CONSTITUTION:In a camera main body 1, a film cartridge is housed in a cartridge room 2, and the cartridge is pulled out from the room 2 and taken up to a film spool 4 disposed on the opposite side of the room 2 through an aperture. The pressure plate 7 which interposes the film in a gap between the camera main body 1 and itself and is provided with guiding parts 7a, 7b, 7c... for controlling the position of both ends parts in a film width direction is disposed. When the film fixed to the pressure plate 7 is fed, the film is rubbed in contact with the magnetic storing part, so that the information is written or read out by the magnetic head 8. At this time, the pressure plate 7 can be vertically moved to the film traveling direction and can be turned on the surface parallel with the film surface 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a camera using a film with a magnetic storage section.

[Prior Art] In recent years, film having a magnetic storage area is used, and photographing information such as shutter speed, aperture value, date, title, etc. is written in this magnetic storage area using a magnetic head, and this information can be written as needed. A camera that reads photographic information has been proposed in US Pat. No. 4,864,332 and the like.

[Problem that the invention seeks to solve] However,
In the above-mentioned conventional example, for example, the magnetic storage section is arranged at a predetermined position parallel to the longitudinal direction of the film, and as the amount of information being written and read out increases, the magnetic head is placed at the predetermined position on the film. It is necessary to always position accurately. However, since the film travels while being undulated in the vertical direction of the screen while being fed, the following problems have occurred.

(1) Since a positional shift occurs between the magnetic storage section of the film and the magnetic head, accurate writing and reading of photographic information cannot be performed.

(2) The magnetic head must be brought into contact with the magnetic storage portion of the film as perpendicularly as possible, but the above-mentioned waviness of the film reduces the perpendicularity of the magnetic head to the running direction of the film.

[Means for Solving the Problems] The present invention includes at least a cartridge chamber for storing a film cartridge, and a chamber located on the opposite side of the cartridge chamber with an aperture therebetween, for winding a film with a magnetic storage section pulled out from the film cartridge. A camera body having a film spool to be taken, a pressure plate having a guide portion for sandwiching the film in the gap between the camera body and regulating the position of both ends in the width direction of the film, and a film feeder fixed to the pressure plate. It consists of a magnetic head that writes or reads information by slidingly contacting the magnetic storage section during feeding, and the pressure plate is movable perpendicular to the film running direction and rotatable on a plane parallel to the film surface. It is characterized by:

[Embodiment] Figures 1 to 6 show an embodiment of the present invention, in which Figure 1 is a rear view of the camera with the back cover omitted, and Figure 2 is a view taken along A-A in Figure 1. 3 is a sectional view taken along the line B-B in FIG. 1, and FIG. 4 is a plan view showing the positional relationship between the pressure plate and the film.
5 and 6 are plan views showing different operating states of the pressure plate when no film is loaded.

In FIG. 1, 1 is a camera body, 2 is a cartridge chamber for storing a film cartridge (not shown), and 3 is a film feeding fork that engages with a shaft (not shown) of the film cartridge. A film spool 4 for winding up a film is disposed on the opposite side of the cartridge chamber 2 and an aperture (not shown). 5
．． Reference numeral 6 denotes support shafts having both ends fixed to appropriate positions on the camera body 1. The support shafts 5.6 are parallel to each other and perpendicular to the film running direction. In addition,
The support shaft 5.6 in this embodiment has a cylindrical shape with a circular cross section as shown in FIG. In FIG. 2, the pressure plate 7
A pair of locking portions 7a and 7b are provided on the upper surface (the surface opposite to the surface that contacts the film). The locking part 7
A and 7b are composed 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 a cross-section having a cross-sectional shape, and project as a whole in the optical axis direction. Note that, as shown in FIG. 1, the locking portions 7a and 7b are arranged in an arc shape at symmetrical positions about the approximate center of the pressure plate 7 when viewed from above.

Here, the distance h(
(Fig. 2) is set slightly smaller than the distance 11 (Fig. 1) between the inner sides of the support shafts 5.6, and the support shafts 5.6 are connected to the vertical and horizontal parts of the locking parts 7a and 7b. It is located in a concave space sandwiched between pressure plates 7. Therefore, the pressure plate 7 is capable of sliding in the vertical direction in FIG. . Also, the locking portion 7a.

As shown in FIG. 2, the horizontal portion 7b sandwiches the support shaft 5.6 and regulates the longitudinal position of the pressure plate 7 in the optical axis direction.

As shown in FIG. 4, guide portions 7 c s 7 d 17 e s 7 f are provided at the four corners of the back side of the pressure plate 7. Furthermore, as shown in FIG. 3, a magnetic head 8 is embedded and fixed at a lower position on the back side of the pressure plate 7, and is configured such that the magnetic gap of the magnetic head 8 is perpendicular to the film running direction. . Reference numeral 9 indicates a film pulled out from a film cartridge (not shown) stored in the cartridge chamber 2.

The guide portions 7c, 7d, and further the guide portions 7e, 7
f are arranged in pairs and sandwich both ends of the film 9 in the width direction. That is, the pressure plate 7 against the film 9
The structure is such that the positional relationship between the two is always constant. A magnetic storage section (not shown) is formed on the surface of the film 9 on the pressure plate 7 side, and various information regarding photographing can be written or read by the magnetic head 8.

When the film 9 is not located between the guide portions 7c and 7d of the pressure plate 7 and further between the guide portions 7e and 7f, the upper and lower ends of the pressure plate 7 are bent as shown in FIG. 5 or 6. It is designed to rotate freely within a range until it comes into contact with the stoppers la and Ib of the camera body l. The maximum inclination angle of the pressure plate 7 at this time is indicated by angle β. As shown in FIG. 4, if the angle α is the inclination angle of the pressure plate 7 due to the waviness of the film 9 that occurs during film feeding, the angle β is naturally set to be larger than the angle α. Note that the guide portions 7c, 7d and the guide portions 7e, 7f have cartridge chambers 2 as shown in FIG.
Each has a tapered surface that spreads out to the side. Therefore, the film 9 pulled out from the unillustrated film cartridge housed in the cartridge chamber 2 is attached to the guide portion 7c.

7d and the space between guide portions 7e and 7f.

Next, the operation of the present invention having the above configuration will be explained. First, a back cover (not shown) pivotally attached to one end of the camera body 1 is opened, and a film cartridge (not shown) is loaded into the cartridge chamber 2. As shown in Japanese Patent Application No. 63-220049 filed by the present applicant, such a cartridge has a structure in which, when not in use, the entire film piece including the film league part is housed in the cartridge, and the cartridge is loaded into the camera body. A film is used in which the film is first sent out of the cartridge by the rotation of the shaft of the cartridge only after the back cover is closed.

Next, when the film feeding fork 3 is rotated clockwise in FIG. 2 by a motor (not shown), the shaft (not shown) of the film cartridge engaged with the fork 3 is rotated in the same direction. Accordingly, the film 9 is fed out of the cartridge and its leader portion enters the gap G (FIG. 2) between the pressure plate 7 and the camera body l. Further film 9
When moving to the right in Fig. 1, first the two guide parts 7
c and 7d regulate the position of both ends of the film 9 in the width direction, and when the film 9 further moves, the other two guide parts 7e and 7f regulate the position of both ends of the film 9 in the width direction. During this process, the film 9 passes the position of the magnetic head 8, so that the tip of the magnetic head 8 touches the film 9.
It slides into contact with a magnetic storage section (not shown) of the camera, and allows writing or reading of photographic information. Finally, the leader portion at the tip of the film 9 is wound around the film spool 4. Thereafter, the film 9 is wound up only by rotating the film spool 4 by a motor (not shown), which is similar to a known camera.

Note that even if the film 9 is undulated during film feeding, the pressure plate 7 can be moved perpendicular to the film travel 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 guide portions 7c, 7d, 7e provided on the pressure plate 7
, 7f sandwich both ends of the film 9 in the width direction, so that the magnetic head 8 can always be brought into perpendicular contact with the magnetic storage portion of the film 9.

FIG. 7 shows another embodiment of the present invention, in which a pair of guide portions 7g and 7h are provided at both upper and lower ends of the pressure plate 7 to slide against both ends of the film 9 in the width direction. The guide part 7
g and 7h may be in the form of ribs formed by drawing the pressure plate 7, or may be provided with separate members. In order to facilitate insertion of the film 9, a tapered surface extending toward the cartridge chamber 2 is formed at the right end of the guide portions 7g and 7h. Even in this configuration, the same effects as in the first embodiment can be obtained.

[Effects of the Invention] As explained above, according to the present invention, the pressure plate is provided with a guide portion that regulates the position of both ends in the film width direction, and furthermore, the pressure plate is movable perpendicularly to the film running direction and can be moved vertically to the film surface. Since it is rotatable on a parallel plane, the magnetic head provided on the pressure plate can maintain its relative position relative to the film in a predetermined state, and can continue to maintain perpendicularity to the running direction of the film. Ta. Therefore, even if the film undulates during feeding, there will be no misalignment between the magnetic storage part of the film and the magnetic head.
It is extremely practical as it allows accurate writing and reading of photographic information at all times.

2... Cartridge chamber 5.6...Support shaft 7a, 7b...locking part 7g17h...Guide part 9...Film G...Camera body 4... Film spool 7... Pressure plate 7c, 7d, 7e, 7f.

8...Magnetic head

[Brief explanation of drawings]

FIG. 1 is a rear view of the camera of the present invention, with the back cover omitted;
Figure 2 is a cross-sectional view taken along line A-A in Figure 1, and Figure 3 is B in Figure 1.
-B sectional view, FIG. 4 is a plan view showing the positional relationship between the pressure plate and the film, FIGS. 5 and 6 are plan views showing different operating states of the pressure plate when no film is loaded, and FIG. 7 is the invention of the present invention. FIG. 3 is a plan view showing the positional relationship between the pressure plate and the film in another example.

Claims (2)

[Claims] (1) A camera body having at least a cartridge chamber for storing a film cartridge, and a film spool located on the opposite side of the cartridge chamber across an aperture for winding a film with a magnetic storage section pulled out from the film cartridge; A pressure plate is provided with a guide portion that inserts the film into the gap between the film and the camera body and regulates the position of both ends of the film in the width direction. A film with a magnetic storage section, comprising a magnetic head for writing or reading, wherein the pressure plate is movable perpendicularly to the film running direction and rotatable on a plane parallel to the film surface. camera using. (2) The camera body is provided with two parallel support shafts that are perpendicular to the film running direction, and the pressure plate protrudes in the optical axis direction on the opposite side from the film contact surface, and is fixed to the support shafts and has a flat surface. 2. A camera using a film with a magnetic memory portion according to claim 1, further comprising a pair of locking portions formed in an arcuate shape at symmetrical positions with respect to a substantially central portion of the pressure plate as seen.