JP3392957B2 - Film compatible camera with magnetic recording layer - Google Patents

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, a film in which a magnetic recording layer is coated on a silver salt film (see, eg, FIG. 6) and a camera using the film have been announced. This type of film (hereinafter "new film")
Is a conventional photosensitive layer (emulsion layer) that exposes (shoots) a subject image by exposure, and the magnetic recording layer has, for example, the date, hour, minute, second, shutter speed, aperture value, camera Data such as the type of is recorded.

Data recording on the magnetic recording layer is performed by a magnetic head as in a conventional magnetic tape device. Therefore, the magnetic head is in sliding contact with the magnetic recording layer or the base film. Therefore, there is a possibility that polishing powder, dust, and the like of the magnetic recording member may be attached to the magnetic head to cause contact failure, resulting in recording failure. If the user does not notice the dirt on the magnetic head, there arises a problem that predetermined data has not been recorded. In addition, cleaning the magnetic head requires wiping with a head cleaning liquid such as anhydrous alcohol, which is troublesome. Moreover, in order to enable cleaning, the head surface of the magnetic head must be in a position visible to the user, and the head surface must be in sliding contact with a cleaning tool such as a cotton swab. There was a problem that was limited.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a film-compatible camera having a magnetic recording layer, which can automatically clean the magnetic head.

[0005]

SUMMARY OF THE INVENTION The present invention which achieves this object is a camera in which a film having a magnetic recording layer is loaded, wherein a magnetic head for recording data on the magnetic recording layer is opposed to a spool for winding the film. The present invention is characterized in that a head cleaning member is provided on the surface of the spool which is disposed at a position and can contact the magnetic head.

[0006]

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 external appearance of a camera to which the present invention is applied, with a back cover opened, FIG. 4 is a block diagram showing the main circuit configuration of the same embodiment, and FIG. 6 is a magnetic recording layer used in this camera. It is a top view which shows an example of the film which has a (magnetic recording track).

An opening 13 for loading a film is formed on the rear 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, there is projected a rewinding fork 23 which engages with the spool shaft of the loaded cartridge 71 to rotate it. 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).

The opening 13 of the camera body 11 is opened through a hinge 29 provided at one side edge of the opening 13.
A back cover 31 for opening and closing is attached. When the opening 13 is closed, a pressure plate 33 for maintaining the flatness of the film F in the photographing area located in the aperture frame 15 is attached to the back cover 31 via a spring (not shown), A roller 35 that presses against the spool 25 is mounted via a film pressing spring 37. Further back cover 3
1, projecting from an opening 33a formed in the pressure plate 33,
An idle roller 39, which comes into pressure contact with a roller 49 attached to the camera body 11 with the back cover 31 closed, is attached (see FIG. 2). When the film F is loaded, the idle roller 39 presses the perforation portion of the film F together with the roller 49 so that the roller 49 rotates without slipping in association with the traveling of the film F.

In FIG. 1, reference numeral 41 is an ISO sensitivity window shown on the surface of the cartridge 71 loaded in the cartridge loading chamber 17, and an information window for allowing the display of the number of shootable images to be visually recognized. 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 (the 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. The film running detection roller 49 is exposed through 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 plate 51 is fixed to one end of the rotation shaft. This encoder plate 51 is a slit disc having a large number of slits formed in the circumferential direction at regular intervals and extending in the radial direction, and when the encoder plate 51 rotates, these slits cause the transmission type photo interrupter 5 to move.
The light path is opened / blocked by passing through the light projecting / receiving light path 3. Then, the output of the photo interrupter 53 changes to output a pulse signal. The photo interrupter 53 is driven to be turned on 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 idle roller 39 when the back cover 31 is closed. . And film F
When the sheet travels, the film traveling detection roller 49 rotates, and the photo interrupter 53 outputs a pulse signal in synchronization with the rotation of the encoder plate 51 that rotates integrally with the film traveling detection roller 49. The control circuit 81 detects and counts this pulse signal to detect the presence / absence of the film F, the traveling speed and the traveling amount, and control the rotation speed and stop of the film motor 83. In this embodiment, since the predetermined data is recorded on the magnetic recording layer R by the magnetic head 61 when the film is wound,
The control circuit 81 detects the output interval of the pulse signal and keeps the film winding speed constant.

In the spool chamber 19, a roller 55 for causing the leading end portion (leader portion) of the film F to be wound around the spool 25 at the time of automatic loading, and thereafter preventing the film F from loosening is provided with a roller 55 for holding the spool. It is provided through. The roller 55 is rotatably supported by one end of a spool pressing spring 57, and the other end of the spool pressing spring 57 is fixed to the inner wall (block 21) of the spool chamber 19.

The structure which is a feature of the present invention will be described in detail with reference to FIGS. 2 and 3. On the outer peripheral surface of the spool 25, a head cleaning layer 27 having a width equal to or slightly wider than the width of the magnetic head 61 is formed at a portion facing the magnetic head 61.

The spool chamber 19 has a spool 25.
Head platform 67 and plunger shaft 65 at a position hidden by
The magnetic head 61 is attached via the. The plunger shaft 65 is axially supported by a head base 67 so as to be slidable in the axial direction, and is always biased in a protruding direction by a spring (not shown). That is, the magnetic head 61 is
5 is always elastically urged toward the head cleaning layer 27, contacts the head cleaning layer 27 when the film F is not wound on the spool 25, and contacts the magnetic recording layer R when the film F is wound. Further, even if the film F is wound up on the spool 25 and the outer diameter is changed, the film F is supported so as to come into contact with the magnetic recording layer R with a substantially constant contact pressure. The head cleaning layer 27 also functions as a head pad.

Therefore, the magnetic head 61 (the surface having the recording gap) contacts the head cleaning layer 27 when the film F is not wound around the spool 25. Therefore, when the spool 25 rotates in this state, the magnetic head 61 and the head cleaning are cleaned. The magnetic head 61 is cleaned by sliding contact with the layer 27. On the other hand, when the film F is wound around the spool 25, the magnetic head 61 comes into contact with the magnetic recording layer R, and comes into sliding contact when the spool 25 rotates. At the time of this sliding contact operation, predetermined data is recorded on the magnetic recording layer R by the magnetic head 61. At that time, the control circuit 81
Detects the output interval of the pulse signal and keeps the film winding speed constant.

Further, a reflection type photo interrupter 63 for detecting the presence or absence of perforation is fixed to the tip of the plunger shaft 65 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.

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

The main operation of the camera of this embodiment having this structure is as follows. When the film F is loaded and the back lid 31 is closed, the autoloading operation is started, the spool 25 is rotationally driven by the film motor 83, the film F is wound up to the first frame, and the film F is cued. At this time, since the magnetic head 61 is in contact with the head cleaning layer 27 until the film F reaches the magnetic head 61, cleaning is performed before the start of photographing.

Thereafter, each time exposure is performed, the film F
Is wound up, and predetermined data is written in the magnetic recording layer R via the magnetic head 61 at the time of winding. The operation other than the data writing is the same as that of the conventional silver halide film camera.

When a predetermined number of images have been taken and the predetermined number of images have been taken, the film motor 83 rotates in the rewinding direction and the film F is rewound into the cartridge 71.
Then, when the film F separates from the film detection roller 49, this is detected via the photo interrupter 53,
After a predetermined time has elapsed, the film motor 83 is stopped. The cartridge 71 is taken out from the camera, and the back cover 31
When is closed, the film motor starts and spool 2
5 rotates for a predetermined time. By the rotation of the spool 25, the magnetic head 61 (gap surface 61a) is brought into sliding contact with the head cleaning layer 27 and cleaned. By this cleaning, the gap surface 61a of the magnetic head 61 is
Is always kept clean.

Since the photographing screen and the magnetic recording position are apart from each other in the camera of this embodiment, if the recording is performed in synchronization with the film winding for the exposed screen after the exposure, the photographing screen and the data recording position thereof are It shifts. Therefore, a data memory for storing write data at the time of shooting is provided, and the data at the time of shooting is stored in the data memory. Then, when the shooting screen passes through the magnetic head 61, the data stored in the data memory may be written.

In the second embodiment shown in FIG. 5, the magnetic head 61 is mounted on the spool 25 during film loading.
From the roller 55a and the spool pressing spring 57.
The film F is configured to be reliably wound around the spool 25 by a. The head base 67 is mounted on a seat receiving portion 19a protruding from the block 21 to the outside (inside the camera body) of the spool chamber 19, and the magnetic head 61 is spooled from an opening 19b formed in the film winding chamber 19. Room 1
9 is protruding. The head base 67 includes an electromagnetic coil (not shown). While the electromagnetic coil is energized, the plunger shaft 65 is pulled into the head base 67 against the spring force, that is, the magnetic head 61 is separated from the spool 25, A space is formed between the magnetic head 61 and the spool 25.

In the second embodiment, the electromagnetic coil is energized during the automatic loading to move the magnetic head 61 to the spool chamber 1.
9 is pulled out, so that the leader portion of the film is prevented from coming into contact with the side surface of the magnetic head 61. When the auto-loading is completed, the energization of the electromagnetic coil is cut off, so that the magnetic head 61 projects due to the spring force and comes into contact with the magnetic recording layer R.

As described above, aluminum oxide is used for the head cleaning layer 27 in the present embodiment, but in the present invention, other than this, silicon carbide, fine particles of chromium oxide, etc. can be used.

[0026]

As is apparent from the above description, the present invention is
In a film compatible camera having a magnetic recording layer, the magnetic head is provided so as to face the spool, and the head cleaning member is provided on the surface of the spool that comes into contact with the magnetic head. Therefore, the magnetic head has the film wound on the spool. When it is not present, the head is contacted with the head cleaning member, and the head is cleaned when the spool rotates in this state. Therefore, the magnetic head is always kept in a clean state and no recording failure occurs.

[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 vertical cross-sectional view of a main part of another embodiment.

FIG. 6 is a plan view showing an outline of a film having a magnetic recording layer.

[Explanation of symbols]

11 camera body 13 openings 17 Patrone loading room 19 spool room 25 spools 27 Head cleaning layer 31 case back 51 encoder plate 53 Photo interrupter 61 magnetic head 63 Photo interrupter 65 Plunger shaft 67 head stand 81 Control circuit 83 film motor

Claims (3)

(57) [Claims] 1. A camera in which a film having a magnetic recording layer is loaded, wherein a magnetic head for recording data on the magnetic recording layer is arranged at a position facing a spool for winding the film, and a surface of the spool. A film-compatible camera having a magnetic recording layer, characterized in that a head cleaning member capable of contacting the magnetic head is provided. 2. The magnetic head according to claim 1,
A film-compatible camera having a magnetic recording layer, which is supported by a supporting member so as to be movable toward and away from the spool, and is constantly urged toward the spool by a spring member. 3. The magnetic recording layer according to claim 2, wherein the support member includes an electromagnetic member that moves the magnetic head away from the spool against the biasing force of the spring member. Film compatible camera.