JPH06289480A - Camera provided with magnetic head - Google Patents

Abstract

PURPOSE:To allow a head gap to be excellently in contact with a film magnetic surface by providing a specific curved surface guide in the vicinity of an aperture and projecting the gap of a magnetic head disposed on the side of the rear cover into the curved surface guide. CONSTITUTION:The magnetic head 11 is supported by pins 13 and 14 inserted from the hole of the side surface of the upper guide 12 provided in the vicinity of a pressing plate, independently of the pressing plate attached to the rear cover of a camera main body and confronted with the end part of a film F. The lower guide 15 provided on the camera main body is brought into close-contact with the upper guide 12 at both ends, and in the traveling part of the film, a film guiding part composed of the curved surface bent so as to describe an arc is formed on the photographic lens side of the camera main body. Moreover, the magnetic head 11 has the formation of the curved surface almost similar to the guiding curved surface of the upper guide 12 and is slightly projected from the guiding curved surface and surely brought into contact with the film F in the gap part of the top end of the head. Moreover, the magnetic head 11 is turned at a right angle against the traveling direction of the film F by using the pins 13 and 14 as a supporting point and can follow up the curl of the film F.

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 built-in magnetic head for recording or reproducing at least various information used for photographing on a magnetic layer of a film coated with a transparent magnetic layer.

[0002]

2. Description of the Related Art Recently, in a magnetic layer of a film coated with a transparent magnetic layer, various information used for photographing such as shutter speed, aperture value, photographing distance, presence / absence of flash photography, presence / absence of backlight, date and time, etc. There has been proposed a camera having a built-in magnetic head that performs either recording or reproducing. For example, there are published Japanese Patent Publication No. 4-504316, Japanese Patent Publication No. 3-202830, and Japanese Utility Model Publication No. 4-89934.

In Japanese Patent Laid-Open No. 4-504316, a head is fixed to a film platen (press plate), a guide surface is provided on at least one of the platens, and the platen is engaged with the edge of the film to make the platen perpendicular to the longitudinal direction of the film. The platen is biased and engaged with the film, and the platen is held by three slide recesses so that the platen can move in parallel.

Japanese Patent Laid-Open No. 3-202830 discloses that a head is fixed to a pressure plate and guide portions are provided at both ends of the pressure plate so that the pressure plate can move vertically to the film traveling direction and is parallel to the film surface. It is rotatable.

In Japanese Utility Model Laid-Open No. 4-89934, the head is rotatably fixed to a pressure plate, exposed to the film side through a hole of the pressure plate, and a roller is provided on the facing surface of the head.

[0006]

As described above, in all the prior arts, the head is fixed to the pressure plate (platen) so that the flat gap of the head contacts the flat running portion of the film. The magnetic surface should keep perfect contact. Even if they are separated, good recording or reproduction cannot be performed unless the gap is kept below 0.5 mμ. The film has curl, lateral curl, and the like, and in order to bring the head gap and the magnetic surface into good contact with each other, it is necessary to apply a large pressure of 100 g or more, which makes the film take-up heavy. Further, it becomes difficult to keep the accuracy of the head gap and the angle of the film surface facing each other accurately. In addition, there is not much space on the back of the film, and housing the head makes the entire camera larger.

[0007]

In the camera with a magnetic head for recording or reproducing at least photographing information on a film coated with a magnetic layer in the present invention, the film is focused on a photographing lens. A guide member having a curved guide portion that travels in an arc toward the photographing lens from the surface is provided near the aperture, and the gap of the magnetic head disposed on the case back side of the guide member is projected into the curved guide portion. This is achieved by a camera with a magnetic head.

[0008]

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

FIG. 1 is a perspective view of a camera with a magnetic head as viewed from the rear, and FIG. 2 is a partially enlarged view of a film guide portion. Reference numeral 1 is a camera body, and 1a is an aperture forming a photographing image frame. F is a film coated with a transparent magnetic layer and is stored in the cartridge P before photographing. The cartridge P is stored in the cartridge chamber 1b of the main body 1, and the film F pulled out from the cartridge P passes through the aperture 1a and is wound on the reel 2. A pressure plate 3 is attached to a back cover (not shown) and has an aperture.
At 1a, the film F is pressed by a pressure plate spring (not shown) with a predetermined gap through which the film F passes. Reference numeral 11 denotes a magnetic head, which records or reproduces at least photographing information on the magnetic layer of the film F. The magnetic head 11 is independent of the pressure plate 3 and is provided with an upper guide 12 near the pressure plate 3.
Is held by pins 13 and 14 inserted through holes 12b provided in the side surface of the upper guide 12, and faces the end portion of the film F. Reference numeral 15 denotes a lower guide provided on the camera body 1, which is depicted as being integrated with the body 1 in the figure, but a separate component from the body 1 may be assembled. When the upper guide 12 is attached to the lower guide 15, the upper guide 12 and the lower guide 15 are in close contact with each other at both ends, and in the film traveling portion, as shown in FIG. The film guide portion is formed. Further, the magnetic head 11 forms a curved surface substantially similar to the guide curved surface of the upper guide 12 and projects slightly from this guide curved surface, so that the gap portion at the tip of the head always contacts the film F with certainty.

With this structure, the film F exposed by the aperture 1a is wound around the curved surface of the head gap portion while the curved guide portion is in contact with the magnetic head 11 by the upper guide 12 and the lower guide 15. It runs and is wound up by the reel 2. Further, since the magnetic head 11 can rotate about the pin 13 as a fulcrum at right angles to the film traveling direction, it can follow the curl of the film. The magnetic heads 11 may be provided one at each end of the film in order to balance the film F. However, in order to avoid cost increase, one of the magnetic heads has a shape similar to that of the magnetic head or an upper head. A protrusion similar to the magnetic head provided on the guide 12 may be used.

The attitude of the magnetic head 11 does not necessarily need to be at right angles to the surface of the aperture 1a. As shown in FIG. 3, the guide portion is arranged obliquely due to the configuration of the reel chamber, and the magnetic heads are also arranged obliquely. You may.

As described above, the contact between the magnetic surface of the film and the head gap is not directly pressed by a rubber roller or the like, but a contact pressure is obtained by bending elasticity of the film and tension at the time of winding the film. The film draws an arc to form a wave surface, and the back tension can be obtained from the film passing through the head gap due to the friction with the guide portion, but when the back tension is insufficient, the film feeding side In the mechanism such as the motor or its connecting belt, which becomes the driving force when the film is rewound by being coupled to the reel, the appropriate back tension force is applied by applying the friction torque in the motor or the current that slightly gives the reverse driving force. Can be obtained. In the above description and figures, we explained a camera in which the film is taken out from the cartridge and the information is magnetically recorded. However, there are cameras that return to the cartridge, and in this case, the arrangement of the cartridge and the take-up reel may be reversed.

Further, at the time of photographing, the data can be temporarily stored in the memory in the camera and collectively recorded on the film magnetic layer when the cartridge is rewound, but there is an advantage that continuous running can be performed at the time of data recording. There is no particular difference from the above description and it is easily understood by those skilled in the art, and the description thereof is omitted.

Further, although the upper guide 12 in FIG. 1 is described as an independent component, it may be integrated with the pressure plate 3 or integrated with the lower guide 15.

[0015]

As described above, the camera with the magnetic head of the present invention has the following effects.

Since the film travels around the curved surface of the head gap portion, curling and curling of the film in this portion are reduced, and in combination with the rolling property of the head (rotation at a right angle to the film traveling direction), Good contact with the magnetic surface of the film is possible, and reliable magnetic recording and reproduction are possible.

By the above-mentioned curved winding traveling, the tolerance of the mounting position of the head gap and the angle accuracy can be increased.

It is possible to secure a space for mounting the head in contact with the film magnetic surface (back surface of the emulsion surface) running in the small camera in the thickness direction of the camera. A fixed space is always secured in the curved surface guide portion including the head, and it is easy to pass the leading edge of the film when loading the film.

It is not necessary to retract the head-facing pad or the roller during loading or photographing.

[Brief description of drawings]

FIG. 1 is a perspective view of a camera with a magnetic head as viewed from the rear.

FIG. 2 is a partially enlarged view of a film guide portion.

FIG. 3 is an example in which the magnetic head is tilted.

[Explanation of symbols]

 1 Camera body 3 Pressure plate 11 Magnetic head 12 Upper guide 15 Lower guide

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taketoshi Oh, 2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica Stock Company

Claims (6)

[Claims] 1. A camera with a magnetic head for recording or reproducing at least photographing information on a film coated with a magnetic layer, the film being run from the focus surface of the photographing lens toward the photographing lens side. A guide member having a curved guide portion to be provided is provided near the aperture,
A camera with a magnetic head, wherein a gap of the magnetic head disposed on the case back side of the guide member is projected into the curved surface guide portion. 2. A camera with a magnetic head according to claim 1, wherein the magnetic head is rotatably mounted on the guide member in a direction perpendicular to a traveling direction of the film. 3. The magnetic head according to claim 1, wherein the magnetic head is arranged on one end surface of the film, and a dummy head having a shape substantially the same as the magnetic head is arranged on the other end surface. Camera with head. 4. The magnetic head has a curved surface in the vicinity of the gap, which is similar to the shape of the back cover side of the guide member, and the film is wound around the curved surface and runs in contact with a wide area near the gap. A camera with a magnetic head according to claim 1. 5. A camera with a magnetic head according to claim 1, wherein a friction mechanism for applying a back tension to the film when recording or reproducing while winding the film is provided on the film feeding side. 6. The camera with a magnetic head according to claim 1, wherein the magnetic head is mounted so as to be inclined in a winding direction of the film.