JPH08114852A - Camera coping with film having magnetic recording layer - Google Patents

Abstract

PURPOSE: To provide a camera to which a magnetic head can be mounted without spoiling the compactness of the camera and which is suitable for film having a magnetic recording layer. CONSTITUTION: In this camera, the film F where the magnetic recording layer is formed is loaded; and the camera is provided with a spool 25 winding up the film F, a magnetic head 61 recording the specified data in the magnetic recording layer, and a film pressing spring 37 whose one end is fixed on a back cover, on whose other free end the magnetic head 61 is fixed, and which elastically presses the magnetic head 61 to the magnetic recording layer of the film F wound around the spool 25.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a camera which can use a silver salt film provided with a magnetic recording layer.

[0002]

2. Description of the Related Art In recent years, silver salt films have been
A film having a magnetic recording layer coated on the side opposite to the emulsion side (see, for example, FIG. 5) and a camera using this film have been published. With this type of new film, the subject image is exposed (photographed) to the emulsion layer as in the past.
However, in the magnetic recording layer, for example, data such as date, time, minute, second at the time of photographing, shutter speed, aperture value, focal length, lens or camera type, etc. are recorded. Data recording on the magnetic recording layer is similar to conventional magnetic tape recorders,
The film is made to run at a constant speed, and during this constant speed running, a magnetic head that is in sliding contact with the magnetic recording layer is used.

Further, if the data corresponding to the photographing screen is recorded in the magnetic recording layer, it becomes easy to associate the photographing screen with the magnetic recording data when reproducing the signal recorded in the magnetic recording layer. Therefore, it is conceivable to mount the magnetic head on the back cover so as to contact the magnetic recording layer of the film when the back cover is closed. However, in the configuration in which the magnetic head is attached to the back cover so as to correspond to the shooting screen, the depth of the back cover must be set to be equal to or greater than the depth of the magnetic head from the film surface at the shooting position. turn into.

Further, a pad or the like is required to stably press the film against the magnetic head. This pad must be placed on the opposite side of the magnetic head with the film in between. However, there is a lens barrel in front of the shooting screen. Therefore, a space for accommodating the pad is required between the lens barrel and the film surface, and therefore the lens barrel must be moved forward to secure this space.
There was also the problem of the lens protruding from the camera body.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above conventional problems, and provides a camera suitable for a film having a magnetic recording layer, which enables mounting of a magnetic head without impairing the compactness of the camera. The purpose is to do.

[0006]

SUMMARY OF THE INVENTION The present invention which achieves this object is a camera capable of loading a film having a magnetic recording layer formed thereon, and a back cover for opening and closing an opening of a camera body in which the film is loaded. A spool for winding up a film, provided in the opening, a magnetic head for recording predetermined data on the magnetic recording layer, one end fixed to the back cover, and the other magnetic head at the other free end. And a spring member that elastically presses the magnetic head against the magnetic recording layer of the film wound around the spool when the back cover is closed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a perspective view showing the outer appearance of an embodiment of a camera to which the present invention is applied, with a back cover opened, and FIG. 5 is a plan view showing an example of a film having a magnetic recording layer.

An opening 13 for loading a film is formed on the back surface of the camera body 11. An aperture frame 15 for restricting a photographing screen is provided in the opening 13, and a cartridge loading chamber 17 and a spool chamber 19 on both sides of the aperture frame 15.
Are integrally formed by the aperture block 21.

In the cartridge loading chamber 17, a rewinding fork 23 that engages with the spool shaft of the loaded cartridge 71 to rotate it is projected. Spool room 19
A spool 25 for winding the film is provided inside. Although not shown in detail, the rewinding fork 23 and the spool 25 are driven via the film motor 83, the reduction gear train and the clutch mechanism. When one of them is rotationally driven, the other is in a rotation free state.
In this embodiment, at the time of automatic loading and winding, the rewinding fork 23 is set in a rotation free state and the spool 25 is driven to rotate. When the film is rewound, the rewinding fork 23 is rotationally driven, and the spool 25 is brought into a rotation free state. The film motor 83 is drive-controlled by the control circuit 81 via the motor driver 82 (see FIG. 4).

In the spool chamber 19, the leading end portion (leader portion) of the film is spooled during automatic loading.
As a spool pressing member that guides the film so that it does not separate from 5 and slides between the spool 25 and the film F and that the film wound around the spool 25 does not loosen, a spool pressing roller 55 and a spool pressing roller are used. A spool pressing spring 57 that elastically supports 55 is mounted.

The opening 13 of the camera body 11 is opened through a hinge 29 provided at one side edge thereof.
A back cover 31 for opening and closing is attached. A pressure plate 33 that keeps the flatness of the film F in the photographing region located inside the aperture frame 15 when the opening 13 is closed is attached to the back cover 31 via a spring (not shown). Further, the back cover 31 is projected from an opening 33a formed in the pressure plate 33, and the camera body 1 is closed when the back cover 31 is closed.
Idle roller 3 which is in pressure contact with roller 49 mounted on 1.
9 is attached (see FIG. 2). Idle roller 39
When the film F is loaded,
The perforation portion of the film F is pinched with the roller 49 so that the roller 49 rotates without slipping in association with the traveling of the.

In FIG. 1, reference numeral 41 is an information window for allowing the ISO sensitivity and the number of shootable images to be visually recognized on the surface of the cartridge 71 loaded in the cartridge loading chamber 17, and reference numeral 43. A light-blocking moquette that is in close contact with the surface of the cartridge 71 and shields the information window 41 and the opening 13 from light is a lock pin 45 provided on the camera body 11 when the back cover 31 is closed (not shown). ) To lock the back cover 31 in a closed state.

Although only one is shown on both outer sides of the edge of the aperture frame 15 in the longitudinal direction (film traveling direction), an inner rail 16a and an outer rail 16b which extend parallel to the film traveling direction and guide the film traveling. Is provided. A film running detection roller 49 projects from a roller opening 16c formed between the rails 16a and 16b. Although not shown, the film running detection roller 49 is rotatably supported by a fixed member of the camera body 11, and an encoder 51 is fixed to one end of the rotation shaft. The encoder 51 is a slit disk having a large number of slits formed in the circumferential direction at regular intervals and extending in the radial direction. When the encoder 51 rotates, these slits cause the transmission type photointerrupter 53 to project. The light path is opened / blocked by passing through the received light path. This opening /
The output of the photo interrupter 53 changes due to the light blocking,
That is, a pulse signal is output. The control circuit 81 detects this pulse signal to detect the running of the film and the running amount. The photo interrupter 53 is operated by the driver 85.

The outer peripheral surface of the film running detection roller 49 is located between the upper surface of the inner rail 16a and the upper surface of the outer rail 16b, and presses the film F with the roller 39 when the back cover 31 is closed. When the film F runs, the film running detection roller 49 rotates, and the photo interrupter 53 outputs a pulse signal in conjunction with the rotation of the encoder plate 51 that rotates integrally with the film running detection roller 49.

The control circuit 81 includes a photo interrupter 53.
By detecting the pulse signal output by, the running speed of the film, the running amount, and the presence / absence of the film are detected, and the rotation speed and stop of the film motor 83 are controlled. In this embodiment,
Since the predetermined data relating to photographing is recorded on the magnetic recording layer R by the magnetic head 61 during film winding, the control circuit 81
Detects the output interval of the pulse signal output from the photo interrupter 53 and keeps the film winding speed constant.

The means for detecting the running of the film is not limited to this embodiment, and may be, for example, 16a, 16b.
It is also possible to apply the one that detects the edge of perforation by the reflection type photo interrupter provided between
In the illustrated embodiment, the running of the film can be detected at shorter intervals.

Next, regarding the constitution which is the feature of the present invention,
Further, a detailed description will be given with reference to FIGS. 2 and 3. A magnetic head 61 is attached to the back cover 31 via a film pressing spring 37 so as to come into contact with the magnetic recording layer R of the film F wound around the spool 25 when the back cover 31 is closed. One end of the film pressing spring 37 is a back cover 31.
The magnetic head 61 is fixed to the free end of the film pressing spring 37.

The gap surface 61a of the magnetic head 61 comes into contact with the spool 25, that is, the magnetic recording layer of the film F wound around the spool 25 at a predetermined pressure by the elastic force of the film pressing spring 37. At this time, the spool 25
Acts as a head pad, so that the film F and the magnetic head 61 maintain a good contact state. The number of shots increases, the number of windings of the film F increases, and the gap surface 6
Even if the contact radius with 1a becomes large, the magnetic head 61
The film pressing spring 37 bends to maintain a good contact with the magnetic recording layer.

The film pressing spring 37 and the magnetic head 61 guide the film F up to the spool 25 so that the film F runs stably, and the perforation of the film F catches the spool 25 during loading. It also has a function of guiding so as to fit into the projection 25a.

Further, a reflection type photo interrupter 63 for detecting the presence or absence of perforation is fixed to the free end of the film pressing spring 37 adjacent to the magnetic head 61. The output of the photo interrupter 63 is input to the control circuit 81, and the control circuit 81 detects the presence or absence of perforation by the signal, detects the start point and the end point of the photographing screen, and controls the start and stop of data recording.

In this embodiment, since the photographing screen and the magnetic recording position are apart from each other in the film running direction, if the recording is performed during film winding for the exposed screen after exposure, the photographing screen and the data recording position thereof. It shifts. Therefore, we provided a data memory to store the writing data at the time of shooting,
Write the data at the time of shooting to the data memory. Then, when the corresponding photographing screen passes through the magnetic head 61, the data is read from the data memory and written. At that time, the position of the corresponding photographing screen is changed to the photo interrupter 6
The start and stop of data recording are controlled by detecting the output of the data No. 3.

The magnetic head 61 is driven by a control circuit 81 via an amplifier 87 provided in the camera body 11, and the photo interrupter 63 is driven and controlled by a control circuit 81 via a driver 62. These controls are stored in the ROM in the control circuit 81 and are executed based on a predetermined program (algorithm).

Although the present invention has been described based on the illustrated embodiments, the shape of the magnetic head and the shape of the film pressing spring for holding the magnetic head are not limited to this. Although the film pressing spring is a leaf spring having a J-shaped cross section, it may have an arcuate cross section, a straight line shape, or a wider width. The material may be metal or synthetic resin.

[0024]

As is apparent from the above description, the present invention is
The magnetic head is attached to the free end of the film pressing spring member whose one end is fixed to the back cover, and elastically presses the magnetic head against the magnetic recording layer of the film wound around the spool. Therefore, a special space for accommodating the magnetic head is not required, and a head pad is not required, so that a compact camera can be provided.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a film-compatible camera having a magnetic recording layer to which the present invention is applied, with a back cover opened.

FIG. 2 is an enlarged perspective view showing a main part of the embodiment.

FIG. 3 is a vertical cross-sectional view of the main part of the embodiment.

FIG. 4 is a block diagram showing an outline of a circuit configuration of the embodiment.

FIG. 5 is a plan view showing an outline of a film having a magnetic recording layer.

[Explanation of symbols]

 11 Camera Body 13 Opening 17 Patrone Loading Room 19 Spool Room 25 Spool 31 Back Cover 37 Film Pressing Spring 61 Magnetic Head 63 Photointerrupter 81 Control Circuit 83 Film Motor

Claims (1)

[Claims] 1. A camera capable of loading a film having a magnetic recording layer formed thereon, the back cover opening and closing an opening of a camera body in which the film is loaded, and a film provided in the opening. And a magnetic head for recording predetermined data on the magnetic recording layer, one end of which is fixed to the back cover and the other free end of which the magnetic head is fixed to close the back cover. When
A film-compatible camera having a magnetic recording layer, comprising: a spring member that elastically presses the magnetic head against the magnetic recording layer of the film wound around the spool.