JPH08160525A - Magnetic recording device for camera - Google Patents

Abstract

PURPOSE: To provide a magnetic recording device for a camera realizing smooth feeding film by softening frictional force between the magnetic recording layer of the film and a magnetic head at the time of film feeding operation, when magnetic recording operation is not required. CONSTITUTION: This magnetic recording device for the camera in which the film 3 having the magnetic recording layer is loaded to be used is provided with a magnetic recording means including the magnetic head 18 recording information on the magnetic recording layer, a photographing lens barrel 7 whose positional state is changed, a pressing means 20 pressing the film 3 to the magnetic head 18 from the surface on an opposite side to the magnetic recording layer surface of the film 3 so that the magnetic recording layer surface of the film 3 may press-contact with the magnetic head 18, and a releasing means releasing pressing the film 3 to the magnetic head 18 by the pressing means 20 interlocked with the lens barrel 7 in the case the lens barrel 7 is set in a specified positional state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording device for a camera, and more particularly to a magnetic recording device for a camera which loads and uses a film having a magnetic recording layer.

[0002]

2. Description of the Related Art Recently, for example, a film having a magnetic recording layer or the like provided on the film surface of a roll-shaped film housed in a film cartridge so that photographing information and the like can be magnetically recorded. Various proposals have been made. In a camera loaded with such a film, a magnetic head or the like for magnetically recording information on the magnetic recording layer of the film, or the magnetic head or the like with respect to the magnetic recording layer of the film is used. Therefore, a member such as a pressing means for making contact with each other becomes necessary.

The magnetic recording operation by the magnetic head or the like on the magnetic recording layer of the film is generally performed along with the film feeding operation. That is, various proposals have been made to bring the magnetic head or the like into contact with the magnetic recording layer on the film to perform magnetic recording by the magnetic head or the like when performing the film winding operation.

However, when the magnetic head or the like is constantly brought into contact with the film surface, for example, a film feeding operation without magnetic recording operation, that is,
When the film is rewound, the magnetic head and the like are in contact with the film surface, so that the film feeding speed is reduced due to the frictional force generated between the magnetic head and the film surface. There is a problem such as doing.

Therefore, various mechanisms have been proposed in which the magnetic head or the like is retracted from the magnetic recording layer on the film surface as necessary.

For example, a magnetic recording / reproducing apparatus for a camera disclosed in Japanese Patent Laid-Open No. 3-249632 is a magnetic head that is in contact with a magnetic recording layer in association with the collapsing operation of a taking lens barrel. Etc. are moved to the retracted position.

Further, in the information recording / reproducing apparatus for a camera disclosed in Japanese Patent Laid-Open No. 3-202829, the magnetic head is brought into contact with the magnetic recording layer of the film by an actuator composed of a plunger or the like, if necessary. It is the one.

[0008]

However, when high-density magnetic recording is performed by the magnetic head or the like as described above, it is generally necessary to adjust the azimuth angle of the magnetic head or the like with high accuracy. However, the above-mentioned JP-A-3-24
According to the means disclosed in Japanese Patent No. 9632 and Japanese Patent Application Laid-Open No. 3-202829, a desired azimuth angle is secured with high accuracy when the magnetic head or the like is pressed against the magnetic recording layer or retracted. Therefore, there is a problem that the structure becomes very complicated.

An object of the present invention is to reduce the frictional force generated by the contact between the magnetic recording layer of the film and the magnetic head when the film feeding operation is performed without the magnetic recording operation, thereby smoothing the film feeding. It is to provide a magnetic recording device for a camera that realizes transmission.

[0010]

A magnetic recording device for a camera according to the present invention is a magnetic recording device for a camera that uses a film having a magnetic recording layer, and a magnetic head including a magnetic head for recording information on the magnetic recording layer. The recording means, the taking lens barrel whose position changes, and the surface of the film opposite to the surface of the magnetic recording layer of the film so that the magnetic recording layer surface of the film is in pressure contact with the magnetic head. And a releasing means for interlocking with the taking lens barrel to release the pressing of the magnetic head by the pushing means when the taking lens barrel is brought into a specific position. Is characterized by.

Further, in a magnetic recording device of a camera in which a film having a magnetic recording layer is loaded and used, a magnetic head for recording information on the magnetic recording layer and a magnetic head sandwiching the film are arranged to face the magnetic head. A pad, a taking lens barrel having a movable portion, and a pressing force for pressing the pad against the film in association with the moving portion of the taking lens barrel so that the magnetic recording layer surface of the film is pressed against the magnetic head. When the mechanism and the taking lens barrel are placed in a specific position, the pad is operated by the movement of the movable part of the taking lens barrel, and the pressing of the film on the magnetic head by the pressing mechanism is released. And a release mechanism.

The photographing lens barrel has a retracted position separately from the photographing position, and the specific position state is the retracted position.

[0013]

With the pressing means, the film is pressed against the magnetic head from the surface opposite to the magnetic recording layer surface of the film so that the magnetic recording layer surface of the film is pressed against the magnetic head. Is in a specific position state, for example, when the lens barrel is set in the retracted position, the pressing means presses the magnetic head in conjunction with the taking lens barrel.
Release by release means.

Further, by the pressing mechanism, a pad arranged opposite to the magnetic head is sandwiched between the film and the movable portion of the taking lens barrel so that the magnetic recording layer surface of the film is pressed against the magnetic head. While holding down the shooting lens barrel to a specific position, for example,
In the retracted position, the pad is operated by the movement of the movable part of the taking lens barrel, and the release mechanism releases the pressing of the film against the magnetic head by the pressing mechanism.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. First, a film and a film cartridge applied to the camera of the present invention will be described below with reference to FIG.

In a normal state, the film 3 is wound and stored on a film cartridge shaft 2A which is rotatably supported in the film cartridge 2. Here, FIG.
In order to explain the structure of the film 3, the figure shows a state in which the tip of the film 3 is pulled out from the inside of the film cartridge 2.

As shown in FIG. 1, a leader portion 46 is provided at the leading end of the film 3 and no image recording is performed on the leader portion 46.

An exposure screen frame 41 for image recording is provided in the middle of the film 3, and at least one end portion in the width direction of the film 3 with respect to the exposure screen frame 41 is at least provided. A pair of perforations 4
3,44 are provided. On the base surface side (the surface opposite to the emulsion surface) of the other end of the film 3 in the width direction, it is possible to magnetically record shooting information and the like for each frame of the exposure screen frame 41. A magnetic recording layer 45 including, for example, a magnetic layer is provided.

FIG. 2 is a cross-sectional view showing a camera according to an embodiment of the present invention, and is a cross-sectional view of a main part when viewed from the top side of the camera. Note that, in FIG. 2, members that are not directly related to the present invention, such as exterior members of a camera, are omitted in order to avoid complication of the drawing.

As shown in FIG. 2, at one end of the camera body 1, a film 3 having a magnetic recording layer 45 provided on the base surface thereof is housed, as described above with reference to FIG. A film cartridge 2 is provided, and a film take-up spool 4 is rotatably provided at the other end of the camera body 1. The film 3 sent out from the film cartridge 2 by a film feeding mechanism (not shown) in the camera body 1 is the film provided on the camera body 1 and the rear side of the camera body 1. It passes through a film feed path 6 formed of a pressure plate 5 and is wound on the outer peripheral surface of the film winding spool 4.

Further, a photographing lens barrel 7 which is a zoom lens having a two-lens structure consisting of photographing lens groups 11 and 12 is disposed in the substantially central portion on the front side of the camera body 1.
In other words, the taking lens barrel 7 has a cylindrical cam ring 8
And a fixed frame 9 and the like, and is fixed to the front side of the camera body 1 by means of screws 10a, 10b and 10c in the through hole provided in the flange portion at the rear end of the fixed frame 9. There is.

In the taking lens barrel 7, the taking lens groups 11 and 12 are held by lens holding frames 13 and 14 which are movable parts, respectively.
The lens holding frames 13 and 14 have guide pins 30 and 3, respectively.
1 are planted respectively, and are fitted in the straight-moving grooves 15 provided in the fixed frame 9 and the cam grooves 16, 17 provided in the cam ring 8, respectively.
As a result, the lens holding frames 13 and 14 move in the optical axis direction as the cam ring 8 rotates. As a result, the photographing lens barrel 7 moves to the retracted position, which is a non-photographing position, apart from the photographing state position, which is a movement range for focusing, that is, the closest focus position or the infinity focus position. It is like this.

On the other hand, at one end of the film pressure plate 5,
The magnetic head 18 constituting the magnetic recording means for recording information on the magnetic recording layer 45 of the film 3 is screw 19
It is fixed by a, 19b and the like. The magnetic head 18 is arranged at a position where it abuts on the magnetic recording layer 45 on the film 3 passing through the film feeding path 6.

Further, at a position facing the magnetic head 18, a pad 20 which is a pressing means and constitutes a pressing mechanism is arranged so as to sandwich the film 3. The pad 20 presses the film 3 against the magnetic head 18 from the surface opposite to the magnetic recording layer 45 surface of the film 3 so that the magnetic recording layer 45 surface of the film 3 is pressed against the magnetic head 18. It is like this.

That is, the pad 20 is fixed to a pad base 21, and the pad base 21 is fixed to a pad drive lever 22 which is a pad drive means constituting a pressing mechanism and a releasing mechanism. The pad drive lever 22 is rotatably supported on a fixed member in the camera body 1 by a support shaft 25.

Further, one end of a biasing spring 27 is locked in the middle of one arm of the pad drive lever 22, and the other end of the biasing spring 27 is a fixing member of the camera body 1. Is locked to. As a result, the pad drive lever 22 is always urged in the clockwise direction in FIG. 2 by the urging force of the urging spring 27. It is adapted to be pressed against the head 18.

An arm portion 26 is provided at the other end of the pad drive lever 22 and the biasing spring 27 is provided.
The arm portion 26 comes into contact with the rear end surface 23 of the cam ring 8 by the pivotal movement of the pad drive lever 26 by the urging force of the pad drive lever 26, whereby the pivotal movement of the pad drive lever 22 is restricted. Has been done.

In this manner, the pressing mechanism for pressing the pad 20 against the magnetic recording layer 45 surface of the film 3 by the pad base 21, the pad drive lever 22, the arm 26, the biasing spring 27, or the like, or the pressing mechanism. A release mechanism is formed to release the pressing of the film 3 on the magnetic head 18 by.

FIG. 3 is a perspective view showing the external appearance of the essential parts of the taking lens barrel 7 and the pad drive lever 22 provided on the camera body 1 described with reference to FIG.

As shown in FIG. 3, the taking lens barrel 7 is used.
A gear portion 301 is provided on the outer peripheral surface of the flange portion of the rear end portion of the cam ring 8 that constitutes the gear portion 301. The gear portion 301 includes the two-stage gear 302 and the pinion gear 3
A lens barrel drive motor 304, which constitutes a lens barrel drive mechanism disposed in the vicinity of the taking lens barrel 7, is connected via 03 or the like. As a result, the cam ring 8
Are driven to rotate by the driving force of the lens barrel drive motor 304.

On the outer peripheral surface of the cam ring 8,
Code plate 3 including non-conducting surface 305a and conducting surface 305b
05 and two segment members 306a and 30b.
6 is provided, whereby a lens barrel position detection switch 61 for detecting the drive limit end of the cam ring 8 is formed.

A step portion 307 is provided on a part of the rear end surface 23 of the cam ring 8, and the step portion 307 is provided on the pad drive lever 22 as the cam ring 8 is rotationally driven. It is adapted to come into contact with the arm portion 26. As a result, when the photographing lens barrel 7 is brought to a specific position, it is a releasing mechanism and a releasing mechanism that releases the pressing of the pad 20 on the magnetic head 18 by interlocking with the photographing lens barrel 7. Are formed.

FIG. 4 is a block diagram showing an electric circuit in the camera of the above embodiment. Also in FIG. 4, constituent blocks not directly related to the present invention are omitted in order to avoid complication of the drawing.

As shown in FIG. 4, the lens barrel drive circuit 6 is included in the CPU 60 which is a control circuit for controlling the entire camera.
2, film winding circuit 63, film rewinding circuit 64
Are electrically connected to each other, the lens barrel drive circuit 62 drives the lens barrel drive motor 304, the film winding circuit 63 drives a film drive motor 66, and the film winding drive is performed. The rewinding circuits 64 drive the film rewinding motors 67, respectively.

A magnetic recording circuit 69 is electrically connected to the CPU 60, and the magnetic head 18 connected to the CPU 60 receives a signal from the magnetic recording circuit 69 and receives the film 3 film. A magnetic recording operation is performed on the upper magnetic recording layer 45.

The lens barrel position detection switch 61 is electrically connected to the CPU 60, whereby the position of the photographing lens barrel 7 is detected.

The operation of the magnetic recording apparatus for a camera of the above-described one embodiment constructed as above will be described below.

FIG. 5 is a developed view showing the outer peripheral surface of the cam ring 8 in a developed state, and FIGS. 6 and 7 are views showing the operation of the pad drive lever 22. FIG. FIG. 7 shows a state when the contact state between the pad drive lever 22 and the magnetic head 18 is released, and FIG. 7 shows a contact state when the pad drive lever 22 and the magnetic head 18 contact each other. .

As described above, the guide pins 30 and 31 provided on the lens holding frames 13 and 14 for holding the photographing lens groups 11 and 12 in the photographing lens barrel 7.
Is the straight groove 15 of the fixed frame 9 and the cam groove 1 of the cam ring 8.
The lens holding frames 13 and 14 move in the directions along the optical axis as the cam ring 8 is rotated by the lens barrel drive motor 304. It is like this.

At this time, the lens holding frames 13 and 14 are
5 is restricted within a range in which the guide pins 30 and 31 move between points A and B in FIG. 5, that is, between both ends of the cam grooves 16 and 17, respectively. Become.

Here, the point A is the photographing lens group 1
1 and 12 are the retracted positions in the non-photographing state, which are the most retracted positions toward the camera body 1 side, and the point B is the position where the taking lens groups 11 and 12 project most from the camera body 1. That is, it is the closest focus position in the shooting state. Then, in FIG. 5, a point C located in the middle of the points A and B, that is, the cam groove 1
At the bending points on 6 and 17, the photographing lens group 1 is used.
Reference numerals 1 and 12 are infinity in-focus positions in a state of being focused on infinity in the shooting state.

When the photographing lens barrel 7 is in the non-photographing state, that is, at the point A where the lens holding frames 13 and 14 are in the retracted position, the arm portion 26 of the pad driving lever 22 is in the cam ring. 8 is pressed by the step portion 307 on the rear end face 23. In this state, the step portion 307 presses the arm portion 26 of the pad drive lever 22, and at this time, as shown in FIG.
The pad drive lever 22 rotates about the support shaft 25 counterclockwise in FIG. 6 against the urging force of the urging spring 27. As a result, the pad 20 enters a release state in which the pressing operation of sandwiching the film 3 and pressing it toward the magnetic head 18 is released.

On the other hand, in FIG. 5, when the taking lens barrel 7 is in the taking state, that is, the lens holding frame 1
When 3 and 14 are between the point C which is the infinity position and the point B which is the closest position, the arm portion 26 is on the same plane on the rear end face 23 of the cam ring 8. In this state, as shown in FIG. 7, the pad drive lever 22 is moved by the urging force of the urging spring 27.
7 is urged clockwise in FIG. 7, and its rotational movement is restricted by the cam ring 8 and the arm portion 26 contacting each other. And at this time, the pad 2
0 is in a pressed state in which the film 3 is pressed against the magnetic head 18 side.

When the magnetic recording operation is performed on the magnetic recording layer 45 on the film 3 by the magnetic head 18, the CPU 60 transfers the film to the film winding circuit 63 as described with reference to FIG. By outputting a control signal to the film 3
Film feeding (winding operation) for one frame is performed.

At the same time, the CPU 60 outputs a signal corresponding to the recording information to the magnetic recording circuit 69. That is, in this camera, the magnetic recording operation performed on the magnetic recording layer 45 of each frame on the film 3 is performed when the film 3 is wound one frame at a time.

When the film rewinding operation is performed by the film rewinding circuit 64, first, the CPU 60 controls the lens barrel drive circuit 62 to retract the taking lens barrel 7. A signal is transmitted, and at this time, when the retracting operation of the taking lens barrel 7 is completed, this is detected by the lens barrel position detection switch 61. Then, the CPU 60 outputs a film rewinding control signal to the film rewinding circuit 64 to start the rewinding operation of the film 3.

As described above, according to the above-described embodiment, when it is not necessary to keep the magnetic head 18 in contact with the magnetic recording layer 45 of the film 3, that is, the film is fed without the magnetic recording operation. During the operation, that is, during the film rewinding operation, the photographing lens barrel 7 is retracted so that the pad 20 is retracted from the surface of the film 3 so that the magnetic head 18 and the film 3 are not moved. Since there is no friction between them, the film can be fed more smoothly.

In the above embodiment, the step portion 307 is provided on the rear end surface 23 of the cam ring 8 and the pad drive lever 22 driven by the step portion 307 operates the pad 20 to form a film. Although the mechanism for retracting the pad 20 is not limited to this, for example, when the lens holding frame 14 retracts to the retracted position, The same applies when the arm portion 26 of the pad drive lever 22 is pressed.

In the above-described embodiment, the pad 20 is retracted at the retracted position (point A) of the taking lens barrel 7, but the taking lens barrel 7 is at the closest position. The same effect can be obtained even if the pad 20 is retracted from the film surface at the point B and the infinity position C.

Further, by performing the retracting operation of the taking lens barrel 7 prior to the magnetic recording operation by the magnetic head 18 or the like, only at the retracting position (point A) of the taking lens barrel 7. The pads 20 may be pressed against each other.

[Supplementary Notes] (1) In a magnetic recording device of a camera in which a film having a magnetic recording layer on the side opposite to the emulsion side is loaded and used,
A magnetic recording means including a magnetic head for recording information on the magnetic recording layer, a taking lens barrel, and the film on the magnetic head such that the magnetic recording layer surface of the film is pressed against the magnetic head. A pressing means for pressing from the surface side, and a releasing means for releasing the pressing of the pressing means on the magnetic head by interlocking with the taking lens barrel when the taking lens barrel is moved to a specific position. The magnetic recording device of the camera equipped.

(2) In a magnetic recording device of a camera in which a film having a magnetic recording layer is loaded and used, a magnetic head for recording information on the magnetic recording layer and a magnetic head sandwiching the film are arranged so as to face the magnetic head. Pad, and a taking lens barrel having a movable part that moves according to the state,
Pad driving means for contacting or retracting the pad with respect to the film in association with the movement of the movable portion of the photographing lens barrel to press the magnetic recording layer surface of the film to the magnetic head. A magnetic recording device for a camera, wherein the pad drive means retracts the pad when the taking lens barrel is brought into a specific position.

(3) In the magnetic recording device for a camera described in Supplementary Note 1 or Supplementary Note 2, the photographing lens barrel has a retracted position separately from the photographing position, and the specific position state is the retracted position. The location of the camera's magnetic storage device.

(4) In the magnetic recording device for a camera described in Supplementary Note 1 or Supplementary Note 2, the taking lens barrel has a moving range for focusing, and the specific position state is the maximum. A magnetic recording device for a camera at a near focus position or an afocal position.

(5) In a camera in which a film having a magnetic recording layer on the side opposite to the emulsion surface is loaded and used, the camera has a magnetic recording means including a magnetic head for recording information on the magnetic recording layer and a retracted position. When the photographing lens barrel and the photographing lens barrel are moved to the retracted position, the magnetic recording layer of the film is pressed against the magnetic head,
A magnetic recording device for a camera, comprising: a pressing unit that presses the film against the magnetic head from the emulsion surface side of the film in conjunction with the taking lens barrel.

(6) In a magnetic recording device of a camera in which a film having a magnetic recording layer is loaded and used, a magnetic head for recording information on the magnetic recording layer and a magnetic head for sandwiching the film are arranged to face the magnetic head. And a movable lens and a taking lens barrel having a retracted position, and a part of the movable part of the taking lens barrel when the taking lens barrel is moved to the retracted position. A magnetic recording device for a camera, comprising: a pressing mechanism that presses the pad against the film and presses the magnetic recording layer surface of the film against the magnetic head.

(7) In a magnetic recording device of a camera in which a film having a magnetic recording layer is loaded and used, a magnetic head for recording information on the magnetic recording layer and a magnetic head sandwiching the film are arranged to face the magnetic head. Pad, and a taking lens barrel having a movable part that is moved and set to different positions depending on whether the shooting state or the non-shooting state, and the magnetic recording layer surface of the film is set on the magnetic head when the shooting state is set. Pressing means for pressing the pad against the film in conjunction with the movable part of the taking lens barrel so as to make pressure contact, and movement of the moving part of the taking lens barrel when the non-shooting state is set. And a releasing means for releasing the pressing of the film by the pressing means against the magnetic head by the pad.

(8) In the magnetic recording device for a camera as set forth in appendix 7, the taking lens barrel has a movable part that moves in the optical axis direction between a photographing state and a non-photographing state.

[0059]

As described above, according to the present invention, when the film feeding operation without the magnetic recording operation is performed, the frictional force generated by the contact between the magnetic recording layer of the film and the magnetic head is relaxed. Thus, it is possible to provide a magnetic recording device for a camera that realizes smooth film feeding.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a film and a film cartridge applied to a camera of the present invention.

FIG. 2 is a sectional view of a camera according to an embodiment of the present invention,
FIG. 3 is a lateral cross-sectional view of a main part when viewed from the top surface side of the camera.

FIG. 3 is an external perspective view of the main part of the camera body of FIG. 2 with the taking lens barrel and the pad drive lever taken out.

4 is a block diagram showing an electric circuit in the camera shown in FIG.

5 is a development view of the outer peripheral surface of the cam ring of the camera shown in FIG.

FIG. 6 is a view showing the operation of the pad drive lever of the camera of FIG. 2 and is a view showing a released state in which the contact state of the pad is released.

7 is a diagram showing the operation of the pad drive lever of the camera shown in FIG. 2 and is a diagram showing a contact state of the pads.

[Explanation of symbols]

1 ... Camera body 2 ... Film cartridge 3 ... Film 7 ... Shooting lens barrel 8 ... Cam ring 9 ... Fixed frame 18 ... Magnetic head (magnetic recording means) 20 ... Pad (pressing means, pressing) 21) Pad base 22 ... Pad drive lever (pressing mechanism, release mechanism, pad drive means) 26 ... Arm portion 27 ... Energizing spring 307 ... Step portion (release means)

Claims (3)

[Claims] 1. A magnetic recording device for a camera, which is loaded with a film having a magnetic recording layer and used, comprising: a magnetic recording means including a magnetic head for recording information on the magnetic recording layer; and a taking lens barrel whose position changes. A pressing means for pressing the film against the magnetic head from a surface opposite to the magnetic recording layer surface of the film so that the magnetic recording layer surface of the film is pressed against the magnetic head; A magnetic recording device for a camera, comprising: a releasing means for releasing the pressing of the magnetic head by the pressing means in conjunction with the taking lens barrel when the camera is brought into a position state. 2. A magnetic recording device for a camera, which is loaded with a film having a magnetic recording layer and used, wherein a magnetic head for recording information on the magnetic recording layer and a magnetic head sandwiching the film are arranged to face the magnetic head. A pad, a taking lens barrel having a movable part, and a pressing force for pressing the pad against the film in association with the moving part of the taking lens barrel so that the magnetic recording layer surface of the film comes into pressure contact with the magnetic head. When the mechanism and the taking lens barrel are placed in a specific position,
A magnetic recording device for a camera, comprising: a release mechanism that operates the pad by moving a movable part of the taking lens barrel to release the pressing of the film against the magnetic head by the pressing mechanism. 3. The camera according to claim 1, wherein the photographing lens barrel has a retracted position separately from the photographing position, and the specific position state is the retracted position. Magnetic recording device.