JP2000066297A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely write photographing data on film or to surely read out the photographing data from the film by a magnetic head. SOLUTION: Relating to this camera, the film 2 from a film cartridge 1 loaded in a camera main body 10 is supplied to a spool chamber 12 through an inner rail 14 and an outer rail 15, and then still photographing is performed, and the camera is provided with the magnetic head for recording and reproducing data on/from the film 2. In such a case, projection parts 18 displacing the film 2 in a direction where the film 2 comes in contact with the magnetic head 16 are respectively provided on the film contact surface of the lower side inner rail 14 on a side where the head 16 is disposed and the upper side inner rail 14 where the head 16 is not disposed. The projection part 18 is extended over a prescribed range in the longitudinal direction of the inner rail 14, and formed of a curved surface gently inclined so that a middle part in the extending direction may be high and both ends in the extending direction may be low.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a magnetic head for writing or reading photographic data such as shutter speed, aperture value, date and time on or from film.

[0002]

2. Description of the Related Art In recent cameras, a film is completely housed in a cartridge instead of a film containing a patrone whose film lead portion is largely drawn out of the patrone like a 135 film, and a film winding shaft of the cartridge is used. 2. Description of the Related Art Film cartridges that rotate to allow a film to be fed have been used. Also,
An APS camera using such a film cartridge writes photographic data such as shutter speed, aperture value, date and time on the film, or reads photographic data written on the film from the film for each photographic frame on the film. A magnetic head is mounted for the purpose.

Conventionally, a magnetic head in a camera of this type is disposed at an opposing position between an inner rail and an outer rail for guiding a film, which is close to a spool chamber side of the camera body, and is loaded in a cartridge chamber of the camera body. The film fed from the film cartridge is wound on the spool in the spool chamber through the pressure plate that presses from the back and the inner rail and the outer rail, and the magnetic head that comes into contact with this film captures the shutter speed, aperture value, date and time, etc. Data is written on the film, or photographing data written on the film is read from the film.

[0004]

However, in such a conventional camera, the height of the inner rail in a region facing the pressure plate of the camera body is constant, and the inner rail facing the spool chamber from a position outside the aperture region. Is inclined into the spool chamber, so that when tension is applied to the film wound on the spool, the film in the area facing the magnetic head is displaced away from the magnetic head, thereby causing the magnetic head to When the contact pressure of the film is reduced or the film is separated from the magnetic head, there is a problem that writing of photographing data to the film by the magnetic head or reading of photographing data from the film is inaccurate or impossible. In particular, when the distance from the center of the spool chamber to the magnetic head is shortened with the downsizing of the camera, there is a problem that the above-described disadvantage becomes remarkable.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to reliably write photographic data on a film or read photographic data from a film using a magnetic head. It is to provide a camera that can do it.

[0006]

In order to achieve the above object, the present invention provides a camera body, a cartridge chamber provided in the camera body and loaded with a film cartridge.
A spool chamber is provided in the camera main body at a position separated from the cartridge chamber, and is formed in a spool chamber for winding a film sent from a film cartridge in the cartridge chamber, and a camera main body from the cartridge chamber to the spool chamber. An aperture for setting an exposure area, a pair of film guide inner rails provided in parallel with each other on the camera body from the cartridge chamber to the spool chamber through the outside of the aperture, and the inner space from the cartridge chamber. A pair of film guide outer rails provided parallel to the camera main body between the inner rail and a predetermined distance from the inner rail passing through the outside of the rail to the spool chamber, and the inner rail near the spool chamber outside the aperture Between the inner rail and the outer rail. A magnetic head for recording and reproducing data on the film by contacting from the back surface of the film guided by the camera, wherein the inner rail of the pair of inner rails on the side on which the magnetic head is disposed is provided. And a displacing means for displacing the film in a direction in which the film comes into contact with the magnetic head.

[0007] The present invention is also characterized in that the displacement means is provided on each of the pair of inner rails.
The present invention is also characterized in that the displacement means is constituted by a convex portion formed at a position closer to the spool chamber side than a position where the magnetic head is provided. According to the present invention, the convex portion extends over a predetermined range in the longitudinal direction of the inner rail, a middle portion in the extending direction is high, and both ends in the extending direction are gently inclined so as to be low. It is characterized by being formed with a curved surface. The present invention is also characterized in that a pressure plate is provided so as to face the pair of inner rails and the pair of outer rails, and the convex portion faces the pressure plate.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the camera of the present invention will be described below with reference to FIGS. FIG. 1 is a rear view of a camera according to an embodiment of the present invention with a back cover removed, FIG. 2 is a cross-sectional view for illustrating a portion taken along line AA of FIG. 1, and FIG. It is an enlarged view of a part.

1 and 2, an APS type steel camera is provided at a camera body 10, one end of the camera body 10 in the left-right direction, a cartridge chamber 11 in which a film cartridge 1 is loaded, and a cartridge chamber 1.
A spool chamber 12 is provided at the other end of the camera main body 10 in the left-right direction, which is a location away from the spool 1, and winds up the film 2 sent from the film cartridge 1 in the cartridge chamber 11. An aperture 13 is formed in the camera body 10 between the cartridge chamber 11 and the spool chamber 12 to set an exposure area on the film 2 from a photographic optical system (not shown).

Further, a pair of parallel film guide inner rails 14 are provided on the camera body 10 from the cartridge chamber 11 to the spool chamber 12 through the upper and lower portions of the aperture 13 outside the aperture 13 to the spool chamber 12. . Further, the inner rail 14 is moved from the cartridge chamber 11 to the inner rail 14.
Camera body 10 between the outside of the camera and the spool chamber 12
A pair of film guide outer rails 15 are provided in parallel with each other at a predetermined distance from the inner rail 14. Further, the camera body 10 is provided with a pressure plate 17 that faces the pair of inner rails 14 and the pair of outer rails 15 and presses the film 2 guided by the inner rail 14 and the outer rail 15 from the back. . The magnetic head 16 contacts the back surface of the film 2 guided by the inner rail 14 and the outer rail 15 to record and reproduce photographing data on the film. Inner rail 14 and outer rail 15 near room 12
The pressure plate 17 is provided at a position between the pressure plates 17 so as to penetrate the pressure plate 17.

Of the pair of inner rails 14, the film 2 is attached to the film contact surface of the lower inner rail 14 where the magnetic head 16 is disposed and the upper inner rail 14 where the magnetic head 16 is not disposed. Protrusions (displacement means) 18 for displacing in the direction in which the contact portions 16 are brought into contact with each other are provided. Each of the projections 18 is formed at a position closer to the spool chamber 13 than the position where the magnetic head 16 is provided, and faces the pressure plate 17. In addition, the convex portion 18
As shown in FIG. 3, the intermediate rail 181 extends over a predetermined range in the longitudinal direction of the inner rail 14, and an intermediate portion 181 in the extending direction is high,
Both ends 182 and 183 in the extending direction are formed with curved surfaces that are gently inclined so as to be lower.
It has a structure that makes it easy to climb up. The height of the intermediate portion 181 of the projection 18 is set to a height at which the film can be displaced in a direction in which the film comes into contact with the magnetic head when a tension is applied to the film by winding. The width of the protrusion 18 in the width direction of the inner rail 14 is the same as the width of the inner rail 14. The projection 18 is formed integrally or with another structure when the inner rail 14 is formed on the camera body 10.

A spool 19 for winding the film 2 is provided on the center axis of the spool chamber 12. On the inner wall of the spool chamber 12, the winding start end of the film 2 introduced into the spool chamber 12 is indicated by a spool 19.
The bases of a plurality of spring members 20 which also serve as guides for guiding in the direction of contact with the outer peripheral surface of the spool are fixed to the ends of the spring members 20. 21 are attached respectively. In FIG. 1, reference numeral 22 denotes a cover that covers the camera body 10, and reference numeral 23 denotes a finder window.

In the camera of the present embodiment configured as described above, when the spool 19 performs a film winding operation each time a still image is taken, the film cartridge 1
The film 2 pulled out from the pressure plate 17 and the inner rail 14
And is introduced into the spool chamber 12 through the inside of a tunnel formed by the outer rail 15 and is sequentially wound around the spool 19. At this time, since the convex portion 18 is formed on the film contact surface of the inner rail 14 at a position close to the spool chamber 12 side, the film 2 rides on the convex portion 18,
When tension is applied to the film 2 by winding, the film 2 is displaced in a direction in which the film 2 comes into contact with the magnetic head 16. Thereby, the film 2 can be reliably brought into contact with the magnetic head 16. Therefore, according to the present embodiment,
Writing of photographing data to the film 2 by the magnetic head 16 or reading of photographing data from the film 2 can be performed reliably. In addition, by providing the protrusion 18 not only on the inner rail 14 on the side of the magnetic head 16 but also on the inner rail 14 on the side without the magnetic head 16,
It is possible to eliminate the imbalance of the tension in the width direction applied to the film 2 and to take up the film 2 stably.

The shape of the convex portion 18 in the present invention is not limited to the shape described in the above embodiment. In short, when the film 2 is tensioned by winding, the film 2 contacts the magnetic head 16. Any shape can be used as long as it can be displaced in the direction in which it is made to move.

[0015]

As is clear from the above description, according to the present invention, when tension is applied to the film by winding,
Since the film can be displaced in the direction in which the film comes into contact with the magnetic head, writing of the photographing data to the film or reading of the photographing data from the film by the magnetic head can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a rear view of a camera according to an embodiment of the present invention with a back cover removed.

FIG. 2 is an explanatory cross-sectional view of a portion along the line AA in FIG. 1;

FIG. 3 is an enlarged view of a main part of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film cartridge 2 Film 10 Camera main body 11 Cartridge chamber 12 Spool chamber 13 Aperture 14 Inner rail 15 Outer rail 16 Magnetic head 17 Pressure plate 18 Convex part (displacement means) 181 Intermediate part 182, 183 Both ends

Claims (5)

[Claims] A camera main body; a cartridge chamber provided in the camera main body and loaded with a film cartridge; and a camera main body provided at a location separated from the cartridge chamber and fed out of the film cartridge in the cartridge chamber. A spool chamber for winding a film to be wound, an aperture for setting an exposure area formed in the camera body from the cartridge chamber to the spool chamber, and a space from the cartridge chamber to the spool chamber through the outside of the aperture. A pair of film guide inner rails provided in parallel with each other on the camera body, and a camera body between the cartridge chamber and the outside of the inner rail to reach the spool chamber in parallel with a predetermined distance from the inner rail. A pair of film guide outer rails provided, and the aperture Recording / reproducing data on / from the film, which is disposed at a position located between the inner rail and the outer rail near the spool chamber on the outer side of the roller and comes into contact with the back surface of the film guided by the inner rail and the outer rail. A magnetic head that performs the following: a displacement that displaces the film on the film contact surface of the inner rail on the side on which the magnetic head is provided, of the pair of inner rails, in a direction in which the film comes into contact with the magnetic head. A camera provided with a means. 2. The camera according to claim 1, wherein said displacement means is provided on each of a pair of inner rails. 3. The device according to claim 1, wherein the displacement means is formed by a convex portion formed at a position closer to the spool chamber than a portion where the magnetic head is provided. camera. 4. The protruding portion extends over a predetermined range in the longitudinal direction of the inner rail, and is gently inclined such that an intermediate portion in the extending direction is high and both ends in the extending direction are low. The camera according to claim 3, wherein the camera is formed by a curved surface. 5. The camera according to claim 3, wherein a pressure plate is provided so as to face the pair of inner rails and the pair of outer rails, and the projection is opposed to the pressure plate.