JPH11194419A - Magnetic recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely make pressure of a pad face a magnetic head, to make the pad pressure constant and to enable the pad to excellently touch a magnetic head regardless of the backlash of the pad and the inclination of the magnetic head in a magnetic recorder built in a camera using a film having a magnetic recording layer. SOLUTION: Since the pressing surface 11a of a spring 11 and the surface to be pressed 10a of the pad 10 are made to abut on each other so that the respective cylindrical parts thereof are orthogonally crossed, the pressure of the spring 11 with respect to the pad 10 is not changed even when the pad 10 is deviated because the backlash is caused between the pad 10 and a member guiding it. Besides, since the pad 10 can be fluctuated, it is stably pressed in the direction of the magnetic head regardless of the inclination of the magnetic head or a magnetic recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording apparatus applied to a camera or the like for writing or reading information by using a film provided with a magnetic recording layer.

[0002]

2. Description of the Related Art Conventionally, there has been known a magnetic recording apparatus which is mounted on a camera or the like using a film (magnetic recording medium) having a magnetic recording layer and writes or reads information on or from this magnetic recording layer. This type of magnetic recording device includes a pad for pressing the magnetic recording medium against the magnetic head, and the pressing force of the pad is secured by pressing the back surface of the pad with an urging member such as a coil spring or a leaf spring ( For example, JP-A-8-339025, JP-A-7-39025
No. 5560). The above-mentioned Japanese Patent Application Laid-Open No. 7-5
As disclosed in Japanese Patent Application Laid-Open No. 560, in order to improve the contact state between a magnetic head and a magnetic recording medium (hereinafter referred to as "head touch"), a pad is swingable in the width direction of the magnetic recording medium. There has been known a device capable of obtaining a stable head touch in accordance with a mounting state of a magnetic head.

[0003]

However, in the above-described conventional magnetic recording apparatus in which the back surface of the pad is pressed by the urging member, the pad and a member (eg, a body) that guides the pad are loose. Depending on the way of pressing, the pressing direction of the pad may be shifted from the gap portion of the magnetic head, or the pressing force may change, and the head touch tends to be unstable. In the conventional configuration using a roller-shaped pad, if the biasing direction and the force of the pad are unstable, the gap between the magnetic head and the contact portion between the pads are displaced in the pitch direction, resulting in magnetic writing and reading. However, there is a problem that is likely to be defective.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and ensures that the pressing direction of the pad can be reliably adjusted to the gap of the magnetic head regardless of the size of the play of the pad and the inclination of the magnetic head. It is an object of the present invention to provide a magnetic recording apparatus which can be directed in the same direction and can keep the pressing force of the pad constant, and can obtain good head touch.

[0005]

According to the present invention, there is provided a magnetic recording apparatus having a magnetic head for writing or reading information to or from a magnetic recording medium. A biasing member for pressing the magnetic recording medium against the magnetic head according to the inclination of the magnetic head, and a biasing member for pressing the pad in the direction of the magnetic head; Both the surface and the pressed surface pressed by the urging member of the pad have an arc shape, and the pressed surface and the arc-shaped portions of the pressed surface are in contact with each other at right angles.

In the above configuration, since the arc-shaped portions of the pressing surface of the urging member and the pressed surface of the pad abut at right angles to each other, there is play between the pad and the member guiding the same. Therefore, even if the pad is shifted in the running direction of the magnetic recording medium, the pressing force on the pad by the biasing member does not change,
Moreover, the pad can swing in the roll direction and the pitch direction of the magnetic head, and is stably pressed and urged in the gap direction of the magnetic head by the urging member regardless of the inclination of the magnetic head or the magnetic recording medium. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A camera provided with a magnetic recording device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a camera provided with the magnetic recording device according to the first embodiment, FIG. 2A is a layout view of each component when the camera is viewed from the front, and FIG. FIG. 4 is a layout diagram of each component of the camera shown by. Body 1
A cartridge chamber 3 in which a film cartridge 2 is mainly mounted, a photographing frame 5 having an opening through which a film 4 is fed and an image is formed by exposure, and a take-up spool 6 for the film 4 are provided. It is composed of a spool chamber 7. The photographing frame 5 is provided at the center of the body 1,
The cartridge chamber 3 is disposed on the right side of the photographing image frame 5 and the spool chamber 7 is disposed on the left side in the drawing.

A magnetic head 9 for reading and writing magnetically to and from the pressure plate 8 and the film 4 is provided on the back side of the film 4 of the photographing frame 5, and the magnetic head 9 is provided on the exposed surface side of the film 4. And a spring 11 for urging the pad 10 are provided. Further, a photographing lens 12 is disposed in front of the photographing image frame 5 on the camera side. The spool chamber 7 is provided with a film roller 13 for holding down the film 4 when the film 4 is wound up. A cover case (indicated by a two-dot chain line) is put on the outer periphery of the main body 1.

The film 4 is provided with a perforation hole 4a at a position corresponding to each frame 14, and the perforation hole 4a is read by a photo sensor 15 provided on the camera side, whereby the frame of the film 4 is read. Confirmation of feed and positioning with respect to the image frame 5 are performed. A magnetic recording portion 4b (track) is provided on the rear side of the film 4, and the magnetic recording portion 4b is
b is pressed against and brought into close contact with the magnetic head 9 so that the magnetic head 9 reads and writes information from and to the magnetic recording section 4b.

FIG. 3 is a cross-sectional view of the vicinity of the magnetic head 9 of the camera according to the present embodiment, FIG. 4 is a cross-sectional view taken along line AA of FIG. 3, and FIG. FIG. 6 is a perspective view of the pad 10 as viewed from the surface facing the spring 11, and FIG. 7 is a diagram illustrating a state where the pressed surface 10 a of the pad 10 and the pressing surface 11 a of the spring 11 are in contact with each other. The magnetic head 9 is fixed to the pressure plate 8 and has a head gap 9a on the surface in contact with the film 4 for reading and writing information from and to the magnetic recording section 4b. The pad 10 is disposed at a position facing the magnetic head 9 with the film 4 interposed therebetween, and is configured to be swingable according to the inclination of the magnetic head 9. Further, a spring 11 fixed to the body 1 is provided on the back side of the pad 10.
Is arranged. The spring 11 has a leaf spring shape, and urges the pad 10 toward the magnetic head 9 by pressing the pressed surface 10a of the pad 10 with the pressing surface 11a.

The pressed surface 10a of the pad 10 has a shape in which a central axis is partially cut parallel to the central axis of a cylinder parallel to the running direction of the film 4.
The first pressing surface 11a has a shape in which a central axis of a cylinder perpendicular to the running direction of the film 4 is partially cut in parallel with the central axis. Therefore, the pressing surface 11a and the pressed surface 1
0a means that these cylindrical portions come into contact with each other in a state of being orthogonal to each other.

The structure of the pad 10 will be described in more detail. As shown in FIG.
In FIG. 0b, the left and right sides are shaped along the curling of the film 4 to facilitate the feeding of the film 4. The pad 10 has a pressing surface 10c for pressing the magnetic head 9 via the film 4, and the pressing surface 10c has a shape along the pad facing surface of the magnetic head 9. When the magnetic head 9 is tilted, the pressing surface 10 c is pressed in reverse by the pad facing surface of the magnetic head 9, and the pad 10 rotates according to the tilt of the magnetic head 9. As shown in FIG. 6, the cylindrical surface 10 a pressed by the spring 11 and the displacement of the pad 10 with respect to the spring 11 are minimized on the surface of the pad 10 facing the spring 11. Spring retaining pieces 10d and 10e for suppressing are provided.

With the above-described configuration, even when the relative displacement between the pad 10 and the spring 11 occurs, the urging force applied to the pad 10 by the spring 11 becomes constant, and the pad 10 Even if the spring 11 is tilted in accordance with the tilt of the head 9, the spring 11
Can be reliably pressed in the direction of the magnetic head 9. The pad 10 is attached to the spring 1 from the back side.
1, the frame 1 sandwiched between the magnetic head 9 and the spring 11 and formed integrally with the body 1.
The position is determined with respect to the magnetic head 9 by a.

Further, the magnitude and direction of the urging force applied by the spring 11 to the pad 10 when the relative displacement between the pad 10 and the spring 11 occurs will be described with reference to FIG. In FIG. 7, x represents a generating line including a contact point of the cylindrical pressed surface 10a, and y represents a cylindrical pressing surface 1a.
1 shows a bus including the contact point 1a. D1 is film 4
, D2 indicates the width direction of the film 4, and D3 indicates the front-back direction of the camera. Since the cylindrical portions of the pressed surface 10a and the pressed surface 11a are arranged in a direction orthogonal to each other, the pressed surface 10a and the pressed surface 11a always contact at one point. Then, even if play is generated between the pad 10 and the frame 1a for positioning the pad 10, and the pad 10 is displaced in the feeding direction (D1) of the film 4, the pad 10 and the pressing surface 11a on the pressed surface 10a side are displaced. Only moves in the feeding direction (D1) along the generatrix x, the position of the pressing surface 11a of the spring 11 does not move in the front-rear direction (D3) of the camera. Even when the pad 10 is displaced in the width direction (D2) of the film 4, the contact of the pressing surface 11a with the pressed surface 10a only moves in the width direction (D2) along the generatrix y, and the spring 11 Does not move in the front-rear direction (D3) of the camera. Therefore, in these cases, the pressing force applied by the pressing surface 11a of the spring 11 to the pressed surface 10a of the pad 10 becomes constant, and the direction of the pressing force applied by the spring 11 to the pad 10 does not change.

Even when the magnetic head 9 is tilted, the pad 10 can swing freely, and the pressed surface 1 of the pad 10
0a and the cylindrical portion of the pressing surface 11a of the spring 11 are in contact with each other in a state of being orthogonal to each other, so that the pressed surface 10a of the pad 10 is pressed by the pressing surface 11a of the spring 11, Pad 1 according to the inclination of
0 swings in the roll direction (the direction along the cylindrical circumference of the pressing surface 11a) and the pitch direction (the direction along the cylindrical circumference of the pressed surface 10a). It can be reliably pressed against the magnetic head gap 9a.

As described above, in the camera according to the first embodiment, the pad 10 and the frame 1 for positioning the pad 10 are used.
a between the pad 10 and the spring 11
The spring 1
Since the one pressing surface 11a does not move in the front-back direction D3 of the camera, the force of the spring 11 pressing against the pad 10 can be made constant. Even when the magnetic head 9 is tilted, the pad 10 is tilted in accordance with the tilt of the magnetic head 9 while the spring 11 keeps pressing the pad 10 in the direction of the magnetic head 9. The head can be reliably pressed against the magnetic head gap 9a to obtain a good head touch.

Next, a magnetic recording apparatus according to a second embodiment will be described with reference to FIGS. FIG. 8 is a cross-sectional view around the magnetic head 9 of the camera according to the second embodiment, and FIG. 9 is a cross-sectional view taken along line BB of FIG. In the first embodiment, a leaf spring-shaped spring 11 is used as the urging means of the pad 10, but in the second embodiment, the pad 1
The coil spring 20 is used as the zero urging means. Similar to the pressing surface 11a of the spring 11, the pressing surface 20a of the coil spring 20 has a shape in which the central axis is partially cut parallel to the central axis of a column perpendicular to the running direction of the film 4, and the pressing surface 20a and the pressed surface 10a of the pad 10 abut on each other in a state where these cylindrical portions are orthogonal to each other. Even with such a configuration, the pad 10
When the relative displacement between the coil spring 20 and the spring 20 occurs, the force of the coil spring 20 pressing against the pad 10 does not change, and the pressing force of the pad 10 against the magnetic head 9 can be kept constant. In addition, the direction of pressing by the pad 10 can be reliably directed to the direction of the magnetic head gap 9a, and a good head touch can be obtained.

The present invention is not limited to the above embodiment, and various modifications are possible. For example, in the above-described two embodiments, the pressed surface 10 a of the pad 10 has a shape in which the central axis is partially cut parallel to the central axis of a column parallel to the running direction of the film 4, and the pressing surface of the spring 11 is formed. 11a is a cylinder whose central axis is partly cut parallel to the central axis of a cylinder whose vertical axis is perpendicular to the running direction of the film 4, but the pressed surface 10a of the pad 10 has its central axis perpendicular to the running direction of the film 4. The cylinder may have a partially cut shape parallel to the center axis, and the pressing surface 11a of the spring 11 may have a shape in which the center axis is partially cut parallel to the center axis of a cylinder whose center axis is parallel to the running direction of the film 4. Good. Further, the present invention can be applied not only to a camera but also to various devices such as a video printer.

[0019]

As described above, according to the present invention, both the pressing surface of the biasing member and the pressed surface of the pad are formed in an arc shape, and the arc-shaped portions of these surfaces are brought into contact with each other at right angles. As a result, even if there is a backlash between the pad and the member that guides the pad and the relative displacement between the pad and the urging member occurs, the position of the pressing surface of the urging member does not move. Therefore, the pressing force of the urging member against the pad does not change, and the pressing force of the pad pressed by the urging member in the direction of the magnetic head can be made constant. Also,
Even when the magnetic head is tilted, the pad is tilted according to the tilt of the magnetic head, and the pad can be reliably biased in the direction of the magnetic head by the biasing member.
The pad can surely press the magnetic recording medium against the gap of the magnetic head, so that good head touch can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a camera provided with a magnetic recording device according to a first embodiment of the present invention.

FIG. 2A is a layout view of each part of the camera, and FIG.
FIG. 3 is an arrangement diagram of each part of the camera shown in relation to a film.

FIG. 3 is a transverse cross-sectional view of the vicinity of a magnetic head of the camera.

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

FIG. 5 is a perspective view of a pad viewed from a surface facing a magnetic head.

FIG. 6 is a perspective view of a pad viewed from a surface facing a spring.

FIG. 7 is a perspective view showing a state where a pressed surface of a pad and a pressing surface of a spring come into contact with each other.

FIG. 8 is a cross-sectional view around a magnetic head of a camera including a magnetic recording device according to a second embodiment of the present invention.

FIG. 9 is a sectional view taken along line BB of FIG. 8;

[Explanation of symbols]

 Reference Signs List 9 magnetic head 10 pad 10a pressed surface 11 spring (biasing means) 11a pressing surface 20 coil spring (biasing means) 20a pressing surface

Claims (1)

[Claims] 1. A magnetic recording apparatus comprising a magnetic head for writing or reading information to or from a magnetic recording medium, wherein the magnetic head is provided at a position facing the magnetic head, and the magnetic head is provided in accordance with a tilt of the magnetic head. A swingable pad for pressing a recording medium against a magnetic head, a biasing member for pressing the pad in the direction of the magnetic head, a pressing surface of the biasing member for pressing the pad, and the biasing member for the pad A magnetic recording apparatus, wherein both the pressed surface pressed by the pressing member and the pressed surface have an arc shape, and the pressed surface and the arc-shaped portions of the pressed surface abut on each other at right angles.