JPH10177213A - Magnetic head supporting device for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic head supporting device for a camera capable of saving a space with a small number of parts. SOLUTION: A head holding plate 6 is arranged between a pressure plate 10 for guiding a film surface and a head pressing plate 26 installed behind, and a magnetic head 2 and guide pins 8A and 8B installed on the head holding plate 6 are made to project toward the film 4 out of the opening part 12, etc., of the pressure plate 10. The head holding plate 6 is held by the head pressing plate 26 with an edge follower structure by a film edge 4a by using guide rail parts 28A and 28B and control pieces 30A and 30B, etc. The head pressing plate 26 is energized forward by leaf springs 36, 38 and 40 so as to bring the magnetic head 2 into press contact with the film 4. The head holding plate 6 is energized by torsion springs 48 and 50 in a direction of bringing the guide pins 8A and 8B into contact with the film edge 4a so that the magnetic head 2 may be shifted following the film edge 4a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head support device for a camera which locates a magnetic head with reference to a film edge and records or reproduces information on a film by the magnetic head.

[0002]

2. Description of the Related Art Conventionally, there has been provided a camera which records information on a film by using a magnetic head and which supports the magnetic head in a so-called edge follower structure.
That is, in this camera, a highly accurate recording track is formed on the film surface by positioning the magnetic head with reference to the film edge. The following is known as a supporting device for supporting such a magnetic head with an edge follower structure.
First, a dedicated master plate for supporting the magnetic head is provided,
A support shaft parallel to the film edge is disposed on the master plate, and a movable plate is mounted on the support shaft so as to be swingable in a direction in which the magnetic head and the film come and go. And on this movable plate,
Attach a head holding plate provided with a magnetic head and guide pins. Here, by using a structure including a fixed clearance between the support shaft and the movable plate and between the movable plate and the head holding plate, the magnetic head is supported by an edge follower structure that can be displaced by following the film edge via a guide pin. Is done.

Further, a leaf spring for urging the movable plate in the forward direction of the magnetic head is provided on the master plate, and a pressure plate for guiding the film surface is disposed on the front surface of the head holding plate. The pressure plate has an opening for projecting the magnetic head toward the film, and is formed in a shape for projecting a guide pin of the head holding plate toward the film. As a result, the guide pins protruding from the front surface of the pressure plate abut against the film edge and are guided, whereby the head holding plate and the magnetic head are positioned with respect to the film edge, and information is recorded and reproduced at a predetermined position on the film. Is performed.

[0004]

However, in the above-described magnetic head support device, a support shaft is provided on a master plate dedicated to the magnetic head, a movable plate is provided on the support shaft, and a head holding plate is arranged. Since the pressure plate is provided, there is a problem that the structure is complicated. In particular, since the support shaft provided on the master plate in the film edge direction needs to include a certain clearance and stably hold the movable plate, the support shaft needs to be longer than a certain length and the plane space becomes large. There is. Further, since the master plate, the support shaft, the movable plate, the head holding plate, and the pressure plate are arranged, the mounting structure is complicated, and the number of parts is increased, so that miniaturization is difficult. In addition, since the master plate and the movable plate do not have a simple planar shape, there is a problem that the processing surface is complicated. SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head support device for a camera capable of reducing the space with a small number of components.

[0005]

In order to achieve the above object, the present invention provides a method for positioning a magnetic head on the basis of a film edge and recording or reproducing information on or from a magnetic surface of the film by the magnetic head. A magnetic head supporting device for a camera that performs at least one of the following: a pressure plate supported by a camera body and having a guide surface for guiding a film surface on a front surface side; and a head disposed on a rear surface side of the pressure plate and holding a magnetic head. A holding plate, a pad arranged on the front side of the pressure plate, and a rear surface side of the head holding plate, which can be linearly moved by the pressure plate in a direction of coming into contact with and separating from the pressure plate, and a running direction of the film and the film. A head holding plate supported in a state where the position is regulated in the width direction of the head, and a plurality of guide pins guided by a film edge are provided on the head holding plate. There is projected, the said head holding plate, and the pressing part for pressing the guide surface of the head holding plate,
A plurality of positioning portions are provided to support the head holding plate linearly movable in the width direction of the film and immovably in the running direction of the film, and the pressure plate has an opening for allowing the magnetic head to face the guide surface. An insertion portion is provided for projecting each guide pin of the head holding plate toward the guide surface side, and further, the head is pressed through the pressing portion of the head holding plate by urging the head holding plate in the pressure plate direction. First spring means for pressing a holding plate to press the magnetic head against the film surface on the pad; and urging the head holding plate in a direction in which the guide pin comes into contact with a film edge, thereby forming a guide pin. And a second spring means for displacing the film following the film edge.

Further, the present invention is characterized in that the head holding plate is supported by the plurality of positioning portions so as to be rotatable around an imaginary axis extending in a direction of coming and coming from the pressure plate. I do. Also, the present invention provides a head holding plate with respect to the pressure plate, wherein a virtual axis extending in a film running direction, a virtual axis extending in a film width direction, and a direction in which the head pressing plate comes into contact with and separates from the pressure plate. It is characterized in that it is supported so as not to be rotatable around the extending virtual axis. Further, according to the present invention, the guide pin includes a first guide pin and a second guide pin, and the head holding plate includes a magnetic head and the first guide pin.
A main body portion provided with the guide pin, and an extension portion extending from the main body portion in the running direction of the film and provided with a second guide pin. Further, according to the present invention, among the insertion portions of the pressure plate, an insertion portion corresponding to the first guide pin is formed continuously with an opening where the magnetic head is arranged, and the second guide pin Is formed in an independent hole shape.

[0007] Further, according to the present invention, the head holding plate includes:
An engaging claw is provided on both sides of the main body of the head holding plate in the film edge direction to engage and hold the head holding plate with a certain gap in the running direction of the film. Further, according to the present invention, the pressing portion of the head pressing plate is provided at a position located on both sides of the magnetic head in the film edge direction, and is formed to extend in a guide rail shape in the width direction of the film. It is characterized by being. Further, in the present invention, the guide rail-shaped pressing portion,
The rail surface is inclined corresponding to the curl of a portion of the film forming a recording track. Further, the present invention is characterized in that the positioning portion of the head holding plate is formed in a projecting shape to be locked to both edges of the head holding plate in the running direction of the film. Further, in the present invention, the first spring means is constituted by a plurality of leaf springs, and the base end side of each leaf spring is fixed to the pressure plate, and the distal ends of these leaf springs are provided on the rear surface of the head holding plate. It is characterized by being pressed.

Further, according to the present invention, the second spring means includes:
One of the torsion coil springs is locked to the pressure plate side, and the other end is locked to the head holding plate. Further, in the present invention, the first spring means is constituted by a plurality of leaf springs, and the base end side of each leaf spring is fixed to the pressure plate, and the distal ends of these leaf springs are provided on the rear surface of the head holding plate. The mounting member which is pressed and fixed to the leaf spring of the first spring means is a screw which is screwed into a screw hole formed in the pressure plate, and a torsion coil of the second spring means is attached to a shaft portion of the screw. A spring is mounted. Further, in the invention, it is preferable that the pressure plate locks a screw hole into which the screw of the attachment member is screwed, a housing recess for housing the torsion coil spring of the second spring means, and one end of the torsion coil spring. And a block portion having a receiving surface for receiving a base end portion of the leaf spring of the first spring means. Further, the present invention is characterized in that stopper means is provided between the head holding plate and the pressure plate, or between the head holding plate and the head pressing plate, for regulating a limit position of the head holding plate in the film edge direction. I do. Further, the present invention is characterized in that the stopper means is constituted by the guide pin and an insertion portion.

The present invention also relates to a magnetic head support device for a camera, which locates a magnetic head with reference to a film edge and performs at least one of recording and reproducing of information on a magnetic surface of the film by the magnetic head. hand,
A pressure plate supported by the camera body and having a guide surface for guiding the film surface on the front side, a head holding plate disposed on the rear side of the pressure plate and holding a magnetic head, and a pad disposed on the front side of the pressure plate; A head holding plate disposed on the rear surface side of the head holding plate, a plurality of guide pins guided by a film edge are provided on the head holding plate, and the magnetic head is provided on the pressure plate. An opening portion facing the pad side and an insertion portion for projecting the guide pin to the front side of the pressure plate are provided, and the head holding plate can be linearly moved by the pressure plate in a direction in which the head pressing plate comes into contact with and separate from the pressure plate, and a film is provided. The head holding plate is linearly movable in the width direction of the film by the head holding plate, and the running of the film is restricted. Immovably supported in the direction, further,
First spring means for pressing the head holding plate to press the magnetic head against the film surface on the pad by urging the head holding plate in the direction of the pressure plate; and And a second spring means for urging in a direction abutting on the film edge. Further, according to the present invention, the head holding plate is supported by the head holding plate so as to be linearly movable in the width direction of the film and immovable in the running direction of the film, and further extends in a direction in which the head holding plate comes into contact with and separates from the pressure plate. And is rotatably supported around a virtual axis. Also, the present invention provides a head holding plate with respect to the pressure plate, wherein a virtual axis extending in a film running direction, a virtual axis extending in a film width direction, and a direction in which the head pressing plate comes into contact with and separates from the pressure plate. It is characterized in that it is supported so as not to be rotatable around the extending virtual axis.

The present invention also relates to a magnetic head support device for a camera, which locates a magnetic head with reference to a film edge and performs at least one of recording and reproducing of information on a magnetic surface of the film by the magnetic head. hand,
A pressure plate supported by the camera body and having a guide surface for guiding the film surface on the front side, a magnetic head disposed on the rear surface side of the pressure plate and facing the guide surface from an opening of the pressure plate, and a film edge inserted through the pressure plate. A head holding plate provided with a guide pin that abuts on the pressure plate, and a pad disposed on the front side of the pressure plate. It is supported and supported in a state where the position is regulated in the running direction of the film, and is further urged in a direction in which the magnetic head is pressed against the film surface on the pad and in a direction in which the guide pin comes into contact with the film edge. It is characterized by the following.

[0011]

Next, an embodiment of a magnetic head supporting device for a camera according to the present invention will be described. FIG.
FIG. 1 is an exploded perspective view showing an example of a magnetic head supporting device of a camera according to the present invention. FIG. 2 is a front view showing a state where a head holding plate and a head holding plate of the magnetic head supporting device shown in FIG. 3 is a rear view showing an assembled state of the magnetic head supporting device shown in FIG. 1, and FIG. 4 is a sectional view taken along line AA of FIG.

First, a camera equipped with the magnetic head support device of the present embodiment magnetically records various data at the time of imaging with a magnetic head on a film having a magnetic surface, reads this information at the time of printing, and processes the information based on the data. The recording track by the magnetic head is formed near an edge portion that does not conflict with the imaging area of the film. The magnetic head mounted on this camera is a two-track type magnetic head provided with two head caps, and records and reproduces information using the two head caps. The magnetic head supporting apparatus of this embodiment supports the magnetic head in an edge follower structure in order to perform recording on the film while positioning the magnetic head with reference to the film edge.

In the following description, the running direction of the film 4 shown in FIG. 1, that is, the direction of the film edge 4a is defined as the X-axis direction (left-right direction), and the width direction of the film 4 is defined as the Y-axis direction (vertical direction). And The magnetic head 2
The direction in which the film 4 comes into contact with and separates from the Z axis direction (front-back direction)
And The X axis is defined as a roll direction, the Y axis is defined as a pitch direction, and the Z axis is defined as an azimuth direction. In order to properly hold the magnetic head 2, the following conditions are required in each direction. First, in the X-axis direction, if the magnetic head 2 is displaced in the X-axis direction during data writing, the write pulse width changes and the signal becomes unstable. Therefore, the displacement in this direction should be as small as possible. . In the Y-axis direction,
Since the distance of the data writing track from the film edge 4a is defined by the position in the Y-axis direction, the position in the Y-axis direction must always be the same with respect to the film edge 4a. Also, in the Z-axis direction, the magnetic head 2 must always be in contact with the film while writing data, and a biasing force in the Z-axis + direction is applied to the magnetic head 2 so that the magnetic head 2 is always pressed against the film 4. There is a need to.

Further, as for the roll direction, it is necessary to guide the magnetic head 2 in a direction corresponding to the curl of the film to secure a good head touch. In the pitch direction, if the magnetic head 2 rotates in pitch during data writing, the pulse width becomes unstable. The magnetic writing portion (the center of the magnetic head) of the head 2 is
Move away from For this reason, it is necessary to regulate the rotation in the pitch direction. In addition, the azimuth of the present example is not simply the inclination of the head, but the angle of the magnetic flux transfer line with respect to a line drawn perpendicularly to the film width direction from the reference edge 4a of the film 4, that is, the film edge and the writing portion of the magnetic head This is the angle between the trajectories. This azimuth angle is
Must be less than a certain value.

Hereinafter, each element of the head support device of this embodiment will be described in order. In FIG. 1, a magnetic head 2
Is fixed to the front surface of the head holding plate 6. The head holding plate 6 has a substantially rectangular main body 6A on which the magnetic head 2 is arranged, and a film running direction (X) from the main body 6A.
The arm 6B extends in the (+) direction, and the projecting piece 6 protrudes from the opposite side (X-direction) of the arm 6B of the main body 6A.
C. The head holding plate 6 is provided with guide pins 8A and 8B on both sides of the magnetic head 2. Each guide pin 8A, 8B is
a, and guides the magnetic head 2 for positioning by following the position of the film edge 4a. The first guide pin 8 </ b> A is arranged on the main body 6 </ b> A of the head holding plate 6 at a position close to the magnetic head 2. Also,
The second guide pin 8B is arranged at the tip of the arm 6B. By arranging the guide pins 8A and 8B at positions separated from each other in this manner, stable followability to the film edge 4a is obtained.

A pressure plate 10 for guiding the film surface is provided on the front surface of the head holding plate 6. The pressure plate 10 is positioned and fixed with respect to the camera body, is formed in a flat plate shape, and has a guide surface for guiding the film surface of the film 4 on the front surface. An opening 12 for allowing the magnetic head 2 to face the film 4 is formed in the pressure plate 10, and an insertion portion 14A through which the guide pins 8A and 8B are inserted.
14B are formed. The opening 12 through which the magnetic head 2 is inserted is formed in a rectangular shape corresponding to the front surface shape of the magnetic head 2, and the opening 12 is formed around the magnetic head 2 so that the magnetic head 2 can swing within the opening 12. Are formed to have a certain gap therebetween. First guide pin 8A
The first insertion portion 14 </ b> A through which is inserted is formed continuously with the opening 12. Further, the second insertion portion 14B through which the second guide pin 8B is inserted is formed in an independent hole shape. Each of the insertion portions 14A, 14B is formed in such a size that the guide pins 8A, 8B can be displaced in a plane orthogonal to the longitudinal direction of the guide pins 8A, 8B. still,
In this embodiment, the guide pins 8A and 8B are inserted through the insertion portions 14A and 1A.
4B, the Y axis of the head holding plate 6
The limit position in the direction is restricted, so that the guide pins 8A, 8
B and the insertion portions 14A and 14B also serve as stopper means for regulating the limit position of the head holding plate 6 in the Y-axis direction. Further, on the rear surface of the pressure plate 10, there are provided block portions 16, 18, and 20 for attaching a leaf spring or the like described later. These block units 16, 18, and 20 will be described later.

A magnetic head 2 facing the opening 12 is provided with a film 4 at a position facing the opening 12 of the pressure plate 10.
And a pad 60 that is pressed into contact with the pad. The pad 60 is positioned and fixed with respect to the camera body, and runs with the film 4 sandwiched between the pad 60 and the magnetic head 2 to record and reproduce magnetic information. . The film 4 travels while being guided by a film rail or the like (not shown).

As shown in FIGS. 1 and 3, bosses 22 and 24 projecting rearward are formed on the rear surface of the pressure plate 10 on both upper and lower sides of the opening 12 as shown in FIGS. The boss portions 22 and 24 are for fitting and guiding a head holding plate 26 disposed behind the head holding plate 6 so as to be linearly movable in the Z-axis direction. That is, each boss portion 22, 24
Have an axis in the Z-axis direction, and the upper boss portion 22 is fitted into a hole 58A of a fitting cylinder portion 58 provided at the upper edge of the head holding plate 26, and the lower boss portion The part 24 is
The head holding plate 26 is fitted into a fitting groove 56 provided on the lower edge thereof. As a result, the head holding plate 26 is
Can be linearly moved in the Z-axis direction with respect to the pressure plate 10 while being interposed, and cannot be displaced in the rotation direction of the pitch, roll, and azimuth while the position is regulated in the X-axis direction and the Y-axis direction. Held in state.

On the front surface of the head holding plate 26, the guide rail portions 28A and 28B for guiding the magnetic head 2 against the film surface by pressing and guiding the head holding plate 6 from the rear surface side to the pressure plate 10 side. Is protruding. The guide rails 28A and 28B are each formed in a longitudinal shape along the Y-axis direction, and are disposed so as to be located on both left and right sides of the magnetic head 2. The back is pressed in a well-balanced manner. Since the film surface of the film 4 has a certain curl near the edge 4a, it is preferable that the magnetic head 2 be pressed against the curl. Therefore, in this example, the guide rail portions 28A, 28B
By providing an inclination of, for example, about 1 ° to 2 ° in a direction (roll direction) protruding toward the pressure plate 10 as it moves upward (Y axis + direction), good contact between the film surface and the magnetic head 2 is achieved. Get the status.

On the front surface of the head holding plate 26, a regulating piece 30A for regulating the position of the head holding plate 6 in the X-axis direction is provided.
30B (corresponding to the positioning part in the claims) is protruded. Each of the restricting pieces 30A and 30B is
Are arranged below the protruding piece 6C and the arm 6B, and contact the left and right sides of the main body 6A to regulate the position in the X-axis direction. Each of the restriction pieces 30A and 30B has a contact portion formed in an arc shape and is in contact with the head holding plate 6 in a state close to a point contact.
Although movement of the head holding plate 6 in the X-axis direction is restricted, linear movement of the head holding plate 6 in the Y-axis direction and displacement of the head holding plate 6 in the azimuth direction are possible, and the structure does not hinder the following operation of the head holding plate 6 by the film edge 4a. I have. That is, in this example,
By suppressing the movement of the magnetic head 2 in the X-axis direction as much as possible, the fluctuation of the recording pulse width by the magnetic head 2 is prevented, the follow-up properties in the Y-axis direction and the azimuth direction are secured, and a stable signal state and high-precision tracking are achieved. Is what you get.

The head holding plate 26 has four engagement claws 32A, 3
2B, 34A and 34B are provided. These assembling claws 32A, 32B, 34A, 34B are used to assemble the magnetic head support device, as shown in FIG.
The head holding plate 6 is engaged with and held by the head holding plate 26 to suppress unnecessary movement of the head holding plate 6, and the head holding plate 6 is brought into and out of contact with the pressure plate 10, the film running direction, and the film. They engage with a certain gap in the width direction. Engaging claw portions 32A, 32B, 34A,
The upper engaging claws 32A, 32B of the 34B are engaged with the upper part of the main body 6A of the head holding plate 6 in cooperation with the guide rails 28A, 28B, and the lower engaging claws 32A, 32B. The dowel portions 34A, 34B are connected to the guide rail portions 28A,
8B, and engages with the lower part of the main body 6A of the head holding plate 6.

The lower engaging claws 34A and 34B are elastically flexible, and are pressed by the head holding plate 6 against the head holding plate 26 so that the edges of the head holding plate 6 cause the claws to be formed. Is pressed, and the engaging claw portions 34A and 34B are bent in a direction (left-right direction) to spread each other, and are engaged with the edge of the head holding plate 6. Therefore, first, the head holding plate 6 is connected to the upper engaging claw portions 32A, 3A.
2B, and by engaging with the lower engaging claws 34A, 34B, the head holding plate 6
Can be assembled. The center of the head holding plate 26 is open, and has a structure in which, for example, wiring connection to the magnetic head 2 can be conducted from the back side.

Next, three leaf springs 36, 38 and 40 are provided behind the head holding plate 26. The two leaf springs 36 and 38 press the rear surface of the head holding plate 26 on the upper edge side.
Tips 36A, 38A extending in the center direction from the left and right sides of the
Are pressed against the head holding plate 26. The base ends 36B, 38B of the leaf springs 36, 38 are formed in a wide rectangular plate shape, and are fixed to the pressure plate 10 side by set screws 42, 44. That is, the set screws 4 are provided at the base ends 36B and 38B of the leaf springs 36 and 38, respectively.
Holes 36a and 38a through which the holes 2 and 44 pass are formed. Then, these base ends 36B and 38B are connected to the pressure plate 10 described above.
The set screws 42, 44 are screwed into the screw holes of the block portions 16, 18 through the holes 36a, 38a in a state of being abutted against the end surfaces of the block portions 16, 18, so that the base ends of the leaf springs 36, 38 are screwed. Blocks 36B and 38B are replaced with block 1
Tighten to 6 and 18. A hole 36b for stopping rotation is formed in the base end portion 36B of the leaf spring 36,
By fitting with the projection 16a of the block portion 16, the rotation of the leaf spring 36 is restricted. On the other hand, an engagement piece 38b for preventing rotation is formed at the base end portion 38B of the leaf spring 38, and the rotation of the leaf spring 38 is restricted by being fitted and clamped by the projections 18a and 18b of the block portion 18. Have been.

The leaf spring 40 presses the lower surface of the head holding plate 26 on the lower edge side.
The front end portion 40A extending from one side to the center portion of No. 6 comes into pressure contact with the head holding plate 26. This leaf spring 40
Also, a hole 40a through which a set screw 46 is formed is formed in the base end portion 40B. When the base end portion 40B is abutted against the end face of the block portion 20 of the pressure plate 10, the set screw 46a is formed.
Is screwed into the screw hole of the block portion 20 through the hole 40a, whereby the base end portion 40B of the leaf spring 40 is fastened and fixed to the block portion 20. Further, two holes 40b for stopping rotation are formed in the base end portion 40B of the leaf spring 40, and the rotation of the leaf spring 40 is regulated by fitting with the protrusions 20a, 20a of the block portion 20. I have.

The two block portions 16 and 18 provided on the upper side of the pressure plate 10 are formed with concave portions 16A and 18A for accommodating torsion springs (torsion coil springs) 48 and 50, respectively. These recesses 16A, 18A are provided so as to form a substantially cylindrical gap around the axes of the set screws 42, 44. When the shafts of the set screws 42, 44 are inserted, each of the torsion springs 48 and 50 are accommodated. Note that the housing recesses 16A and 18A are not completely on the container due to conditions such as a plane space, but have a shape in which the periphery is appropriately broken.
A part of 0 is exposed to the outside. The torsion springs 48 and 50 move the head holding plate 6 downward (in the Y-axis direction), that is, the guide pins 8A and 8B
Are biased in the direction in contact with the edge 4a of That is, one of the torsion springs 48 has one end 48a locked by a locking portion formed in the housing recess 16A of the block portion 16 and the other end 48b connected to the upper edge of the above-described protruding piece 6C of the head holding plate 6. Is engaged.

The other torsion spring 50 has one end 50a locked by a locking portion formed in the housing recess 18A of the block portion 18, and the other end 50b formed by the arm portion 6B of the head holding plate 6 described above. The upper edge is engaged. And by the spring force of these torsion springs 48 and 50,
When the head holding plate 6 is urged downward, each of the guide pins 8A and 8B can stably contact the edge 4a of the film 4, and a favorable edge follower state can be obtained. Thus, in this example, the leaf spring 36,
Since the recessed portions 16A and 18A of the torsion springs 48 and 50 are formed by utilizing the thick space provided by the block portions 16 and 18 for fixing the 38, the space efficiency for disposing the torsion springs 48 and 50 is reduced. It is possible to obtain a structure that protects a part of the torsion springs 48 and 50 from the outside and prevents the torsion springs 48 and 50 from coming off, and can maintain a stable operation state for a long time.

To assemble each member in the magnetic head supporting apparatus as described above, first, as shown in FIG. 2, the engaging claw portions 32A, 32 of the head holding plate 26 described above.
The head holding plate 6 is mounted on the head holding plate 26 by B, 34A and 34B. Thereby, the head holding plate 6
Is restricted from moving in the X-axis direction with respect to the head holding plate 26, and is held so as to be able to move in a certain direction in other directions. Next, the bosses 22 and 24 of the pressure plate 10 are assembled so as to be fitted into the holes 58A and the fitting grooves 56 of the fitting cylinder 58 of the head holding plate 26. In this state, the magnetic head 2 of the head holding plate 6 faces the opening 12 of the pressure plate 10 almost flush, and the guide pins 8A and 8B are inserted into the insertion portions 14A and 14A.
It projects forward of the pressure plate 10 from 14B. As a result, the head holding plate 26 can move linearly in the Z-axis direction with respect to the pressure plate 10 and is restricted in position in the X-axis direction and the Y-axis direction. It is held in a state where it cannot be displaced. Further, the position of the head holding plate 6 is regulated in the X-axis direction, and the head holding plate 6 is held so as to be linearly movable in the Y-axis and Z-axis directions and displaceable within a certain range in the azimuth rotation direction.

Next, the torsion springs 48, 50 are bridged between the pressure plate 10 and the head holding plate 6 while applying a constant torque, and are housed in the housing recesses 16A, 18A. , 40 are set on the respective block portions 16, 18, and 20 of the pressure plate 10, and are fastened and fixed with set screws 42, 44, and 46, respectively. As a result, the position of the head holding plate 6 is restricted in the X-axis direction, and in the other Y, Z-axis directions and the respective rotation directions of roll, pitch, and azimuth, the leaf springs 36, 38, 40 and the torsion spring 48, Due to the operation of 50, a state where a constant urging force is applied is maintained.

That is, in the Y-axis direction, the guide pins 8A, 8B are urged downward (in the Y-axis direction) by the torsion springs 48, 50 so that the guide pins 8A, 8B abut against the underlines of the insertion portions 14A, 14B. The leaf springs 36, 3
The magnetic head 2 is urged forward (Z axis + direction) by 8 and 40, and the magnetic head 2 is brought into contact with the pad 60. With respect to the roll direction, the magnetic head 2 is held in an inclined direction by the leaf springs 36, 38, 40, the guide rails 28A, 28B of the head holding plate 26, and the pad 60 so as to correspond to the curl of the film surface described above. . In the pitch direction, the magnetic head 2 is held parallel to the pressure plate 10 by the leaf springs 36, 38, 40, the guide rails 28A, 28B, and the pad 60. In the azimuth direction, an urging force due to the torque balance of the torsion springs 48 and 50 is applied.

When the film 4 is set in the magnetic head supporting apparatus having the above-described structure, the guide pins 8A and 8B abut against the film edge 4a to guide the head 4, and the head holding plate 6 is moved in the Y-axis direction. And azimuth direction. When the position of the film edge 4a changes due to the running of the film 4, the guide pins 8A and 8B are displaced to follow, and the positioning state of the head holding plate 6 in the Y-axis direction and the azimuth direction can be maintained. Therefore, the magnetic head 2 is positioned following the position of the film edge 4a, accurately tracks a predetermined position from the film edge 4a, and performs the recording and reproducing operations of magnetic information.

As described above, the magnetic head supporting apparatus of this embodiment holds the head holding plate 6 between the pressure plate 10 and the head holding plate 26 in a structure capable of displacing in the direction required for the edge follower operation. As an element for holding the head holding plate 6 in an edge follower structure, the head holding plate 6 can be constituted by a shaft element or a projection element in the thickness direction of the head holding plate 6, and a screw or a screw hole. And these elements are
Both can be collected in a plane space. That is, in a structure in which a support shaft parallel to the film edge is provided as in the above-described conventional example, a plane space for the support shaft is necessarily required to secure a stroke of the support shaft. On the other hand, in the magnetic head supporting device of this example, since there is no axial element in the plane direction, the plane space can be reduced, and the degree of freedom in design can be increased. Further, in the magnetic head supporting apparatus of the present embodiment, the head holding plate 26, the head holding plate 6, and the pressure plate 10, the number of parts is small, machining is easy, and mounting work is also easy.

[0032]

As described above, in the present invention, the position of the magnetic head is determined with reference to the film edge, and the magnetic head performs at least one of recording and reproducing information on the magnetic surface of the film. A magnetic head support device, comprising a pressure plate supported by a camera body and having a guide surface for guiding a film surface on a front side, and a magnetic head disposed on a rear surface side of the pressure plate and facing the guide surface from an opening of the pressure plate. A head holding plate provided with a guide pin that passes through the pressure plate and abuts on the film edge, and a pad disposed on the front side of the pressure plate. Supported in such a manner that the magnetic head can be moved linearly in the width direction of the film and the position thereof is regulated in the running direction of the film. The guide pin to the direction to be pressed against the beam plane is configured to be urged in contact with the direction to the film edge. Therefore, according to the present invention, it is possible to hold the head holding plate with a simple structure that enables displacement in the direction necessary for the edge follower operation, and to reduce the space with a small number of components. An apparatus can be provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an example of a magnetic head support device for a camera according to the present invention.

FIG. 2 is a front view showing a state in which a head holding plate and a head holding plate of the magnetic head supporting device shown in FIG. 1 are mounted.

FIG. 3 is a rear view showing an assembled state of the magnetic head support device shown in FIG. 1;

FIG. 4 is a sectional view taken along line AA of FIG. 3;

[Explanation of symbols]

 2 Magnetic head 4 Film 4a Film edge 6 Head holding plate 8A, 8B Guide pin 10 Pressure plate 12 Opening 14A, 14B Insertion part 26 Head holding plate 28A, 28B Guide rail part 30A, 30B Restriction piece 36, 38, 40 Plate spring 42 , 44,46 Set screw 48,50 Torsion spring 60 Pad

Claims (19)

[Claims] 1. A magnetic head supporting device for a camera, wherein a magnetic head is positioned with reference to a film edge, and at least one of recording and reproducing of information is performed on a magnetic surface of the film by the magnetic head. A pressure plate having a guide surface for guiding a film surface on the front side, a head holding plate disposed on the rear side of the pressure plate and holding a magnetic head, and a pad disposed on the front side of the pressure plate, A head holding plate disposed on the rear surface side of the head holding plate and supported by the pressure plate so as to be linearly movable in a direction of coming into contact with and separating from the pressure plate, and in a state where the position is regulated in the film running direction and the film width direction. A plurality of guide pins guided by a film edge are provided on the head holding plate, and a head holding plate is provided on the head holding plate. A pressing portion that presses and guides the rear surface, and a plurality of positioning portions that support the head holding plate so that the head holding plate can move linearly in the width direction of the film and cannot move in the running direction of the film. An opening portion facing the guide surface, and an insertion portion for projecting each guide pin of the head holding plate toward the guide surface side are provided.Furthermore, by urging the head holding plate in the direction of the pressure plate, First spring means for pressing the head holding plate via the pressing portion of the head holding plate to press the magnetic head against the film surface on the pad; and the guide pin for bringing the head holding plate into contact with the film edge And a second spring means for displacing the guide pin following the film edge by urging the guide pin in the direction, and a magnetic head supporting device for a camera. 2. The magnetic field of the camera according to claim 1, wherein the head holding plate is supported by the plurality of positioning portions so as to be rotatable around an imaginary axis extending in a direction in which the head holding plate approaches and separates from the pressure plate. Head support device. 3. The head pressing plate with respect to the pressure plate,
The virtual axis extending in the running direction of the film, the virtual axis extending in the width direction of the film, and the virtual axis extending in the direction approaching to and away from the pressure plate are each supported non-rotatably. Item 3. A magnetic head support device for a camera according to Item 1 or 2. 4. The guide pin includes a first guide pin and a second guide pin, and the head holding plate includes a main body provided with a magnetic head and the first guide pin, and a film running from the main body. The magnetic head support device for a camera according to claim 1, further comprising an extension portion extending in the direction and having a second guide pin. 5. An insertion portion of each of the insertion portions of the pressure plate corresponding to the first guide pin is formed continuously with an opening in which the magnetic head is arranged, and is formed in the second guide pin. 5. The magnetic head support device for a camera according to claim 4, wherein the corresponding insertion portions are formed as independent holes. 6. The head holding plate is provided with engaging claws at both sides of a main body portion of the head holding plate in a film edge direction for engaging and holding a predetermined gap in a running direction of the film. The magnetic head support device for a camera according to claim 4. 7. A pressing portion of the head pressing plate is provided at a position located on both sides of the magnetic head in the film edge direction, and is formed to extend in a guide rail shape in the width direction of the film. A magnetic head support device for a camera according to claim 1. 8. The magnetic head supporting device for a camera according to claim 7, wherein the guide rail-shaped pressing portion has a rail surface inclined corresponding to a curl of a portion forming a recording track of the film. 9. The head holding plate according to claim 1, wherein the positioning portion of the head holding plate is formed in a projecting shape to be engaged with both edges of the head holding plate in the running direction of the film. Camera magnetic head support device. 10. The first spring means is composed of a plurality of leaf springs, and a base end of each leaf spring is fixed to the pressure plate,
10. The magnetic head supporting device for a camera according to claim 1, wherein the distal ends of the leaf springs are pressed against a rear surface of the head holding plate. 11. The second spring means comprises a plurality of torsion coil springs, one end of each torsion coil spring is locked to the pressure plate side, and the other end is locked to the head holding plate. A magnetic head support device for a camera according to any one of claims 1 to 10. 12. The first spring means includes a plurality of leaf springs, and a base end of each leaf spring is fixed to the pressure plate,
The distal ends of these leaf springs are pressed against the rear surface of the head holding plate, and the mounting member for fixing the leaf spring of the first spring means is a screw that is screwed into a screw hole formed in the pressure plate. The magnetic head support device for a camera according to claim 11, wherein the torsion coil spring of the second spring means is mounted on the shaft portion of the camera. 13. The pressure plate locks a screw hole into which the screw of the mounting member is screwed, a receiving recess for receiving the torsion coil spring of the second spring means, and one end of the torsion coil spring. 13. The magnetic head support device for a camera according to claim 12, further comprising a block formed with a locking portion and a receiving surface for receiving a base end portion of the leaf spring of the first spring means. 14. A stopper means is provided between the head holding plate and the pressure plate or between the head holding plate and the head pressing plate to regulate a limit position of the head holding plate in the film edge direction. 10. The magnetic head support device for a camera according to claim 1. 15. The magnetic head support device for a camera according to claim 14, wherein said stopper means is constituted by said guide pin and an insertion portion. 16. A magnetic head supporting device for a camera, wherein a magnetic head is positioned with reference to a film edge, and at least one of recording and reproducing of information is performed on a magnetic surface of the film by the magnetic head. A pressure plate supported on the front side and having a guide surface for guiding a film surface, a head holding plate disposed on the rear side of the pressure plate and holding a magnetic head, and a pad disposed on the front side of the pressure plate; A head holding plate disposed on a rear surface side of the head holding plate; a plurality of guide pins guided by a film edge protruding from the head holding plate; And an insertion portion for projecting the guide pin toward the front side of the pressure plate, wherein the head holding plate is formed by the pressure plate by the pressure plate. Linearly movable in the direction of contact and separation, and supported in a state where the position is regulated in the film running direction and the film width direction, and the head holding plate is linearly movable in the film width direction by the head pressing plate and A first support for pressing the head holding plate by pressing the head holding plate toward the film surface by pressing the head holding plate by pressing the head holding plate by pressing the head holding plate against the film surface; And a second spring means for urging the head holding plate in a direction in which the guide pins come into contact with a film edge. 17. The head holding plate is supported by a head holding plate so as to be linearly movable in the width direction of the film and immovable in the running direction of the film, and further extends in a direction in which the head holding plate comes into contact with and separates from the pressure plate. 17. The magnetic head support device for a camera according to claim 16, wherein the magnetic head support device is rotatably supported around a virtual axis. 18. The head holding plate with respect to the pressure plate extends in a direction in which the virtual axis extends in a film running direction, a virtual axis extending in a film width direction, and a direction in which the virtual plate extends in a direction in which the pressure plate comes in contact with and separates from the pressure plate. 18. The magnetic head supporting device for a camera according to claim 16, wherein the magnetic head supporting device is supported so as not to be rotatable around existing virtual axes. 19. A magnetic head support device for a camera, which performs positioning of a magnetic head with reference to a film edge, and performs at least one of recording and reproduction of information on a magnetic surface of the film by the magnetic head, the camera body comprising: A pressure plate supported on the front surface side and having a guide surface for guiding the film surface; a magnetic head disposed on the rear surface side of the pressure plate and facing the guide surface from an opening of the pressure plate; A head holding plate provided with a guide pin that is in contact with the pad, and a pad disposed on the front side of the pressure plate. And the position of the magnetic head is regulated in the running direction of the film. Idopin is urged in contact with the direction on the film edges, the magnetic head supporting device for a camera, characterized in that.