JPH067447Y2 - Position adjustment mechanism for magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a mechanism for adjusting a fixed position of a magnetic head used in a magnetic recording / reproducing apparatus such as a video tape recorder (VTR), and particularly to azimuth adjustment and tilt. The present invention relates to a magnetic head position adjusting mechanism effective for angle adjustment.

<Outline of Invention> Generally, in a magnetic recording / reproducing apparatus such as a VTR, four types of adjustment are performed in a magnetic head in order to ensure compatibility between individual apparatuses. That is, the height of the magnetic head from the reference surface is adjusted, the azimuth adjustment is performed to adjust the tilt angle of the magnetic head to the left and right, the tilt angle adjustment is adjusted to adjust the tilt angle of the magnetic head to the front and back, and the gear head is moved from a predetermined position. It is an X position adjustment for adjusting the distance to the position.

The present invention provides a low-rigidity thin-walled portion between the magnetic head mounting portion and the other end, and the thin-walled portion of the magnetic head mounting plate that is doubly bent at the thin-walled portion, the magnetic head mounting portion, and the like. By using three screws provided between the end and the fulcrum as a fulcrum, the magnetic head mounting portion is turned in a seesaw shape in two directions with respect to the other end, and the azimuth adjustment and tilt angle during the above-mentioned four types of adjustment are adjusted. It is an adjustment.

<Prior Art> A conventional magnetic head position adjusting mechanism, for example, a typical magnetic head position adjusting mechanism used in a VTR or the like will be described with reference to FIGS. 4 to 6.

In a conventional magnetic head position adjusting mechanism, a substrate 2 having a magnetic head 1 provided on an upper surface thereof is magnetically driven by a tilt angle adjusting screw 3, an azimuth adjusting screw 4, a magnetic head (AC head) screw 5, a spring 6 and a pin 7. The head 1 is supported in the front-rear direction and the left-right direction and is fixed to the substrate mounting arm 8. The board 2 and the board mounting arm 8 are elastically held by the AC head screw 5 and the spring 6. Further, the board mounting arm 8 is urged by a spring 12 so as to come into contact with an X position adjusting nut 14 having a tapered shape screwed upward and onto a shaft 13 having a thread. Further, it is provided on the chassis 9 and the cylindrical guide portion 8a of the board mounting arm 8 and the spring 1
A nut 11 is screwed onto the upper portion of the shaft 10 with a screw penetrating through 2 and 2.

Then, by appropriately rotating the tilt angle adjusting screw 3, the azimuth adjusting screw 4, the nut 11, and the X position adjusting nut 14, the magnetic head 1 mounted on the substrate 2 and further on the substrate 2 is C ₁ −. C _{2 direction,} B 1 -B _{2 direction} is rotated or moved to a 1 -A ₂ direction and _D 1 -D ₂ direction, the required of the magnetic head 4 kinds of adjustments had been made.

<Problems to be Solved by the Invention> In the structure described above, the board 2 is assembled when the pin 7, the AC head screw 5, the spring 6, the tilt angle adjusting screw, and the azimuth adjusting screw that elastically sandwich the board 2 and the board mounting arm 8 are assembled.
Since the above-mentioned parts must be attached one after another while holding the board mounting arm, workability is poor, and many parts are required for azimuth adjustment and tilt angle adjustment. Also, pin 7
There was some misalignment due to rattling.

Therefore, there is a problem that productivity is lowered, the number of parts is increased, and performance is lowered.

<Means for Solving Problems> The present invention focuses on the problems as described above, and connects the part constituted by the conventional board 2, the board mounting arm 8 and the pin 7 to the board part, the arm part and them. Replaced with a sheet of metal consisting of a low-rigidity thin-walled part, double-fold this with a low-rigidity thin-walled part, and use the deformation of the thin-walled bent part to substitute the role of the conventional pin 7 as a fulcrum. The other parts have the same structure as the conventional one, so as to improve the assembling workability of the position adjusting mechanism of the magnetic head, reduce the number of parts, and improve the performance.

<Operation> As described above, since the basic portion of the tilt adjusting portion of the magnetic head, which has conventionally been composed of two metal plates and pins, is composed of one metal plate, the assembly function of the same adjusting mechanism is improved. The performance can be improved by reducing the number of partial points and eliminating rattling of the pin section.

<Embodiment> An embodiment of the magnetic head position adjusting mechanism of the present invention will be described below with reference to FIGS. 1, 2, and 3.

FIG. 1 is a top view, FIG. 2 is a front view, and FIG. 3 is a side view.

Incidentally, the same parts as those in the conventional example shown in FIGS. 4, 5, and 6 are designated by the same reference numerals, and the description thereof will be omitted.

In FIGS. 1 to 3, the magnetic head mounting plate 15 is a sheet metal including a magnetic head mounting portion 15a, an arm portion 15b, and a low-rigidity bent portion 15c that connects them, and the magnetic head mounting plate is in the same portion. It is double-folded and bent. Further, the cylindrical guide portion 8a is fixed to the arm portion 15b.

The low-rigidity bent portion 15c serves as a fulcrum by plastic deformation when adjusting the tilt in the tilt angle direction of C ₁ -C ₂ by the tilt angle adjusting screw 3 of the magnetic head mounting portion with respect to the arm portion 15b. When adjusting the inclination of _1- B _{2 in} the azimuth direction, it becomes a pair with the tilt angle adjusting screw 4 and similarly serves as a fulcrum by its plastic deformation. Spring 6 is low bending rigidity portion 15c overcomes the elastic force, low rigidity the inclination of the magnetic head attachment portion 15a with respect to the arm portion 15b to _C 1 -C _two directions _{C 2} direction and _B 1 -B ₂ direction _{B 1} direction It is an elastic body that gives a biasing force sufficient for plastically deforming the bent portion 15c to the magnetic head mounting portion 15a together with the AC head screw 5.

The other members are related to the X position adjusting mechanism and the height adjusting mechanism, and have the same structure as the conventional one.

The position adjusting mechanism of the magnetic head configured as described above is adjusted as follows.

First, when the tilt angle adjusting screw 3 is turned, the magnetic head mounting portion 15a is moved to the low rigidity bending portion 15 with respect to the arm portion 15b.
Since the amount of plastic deformation of c changes, the amount of inclination in the C ₁ -C ₂ direction also changes. Further, when the azimuth adjusting screw 4 is turned, the magnetic head mounting portion 15a changes the tilt amount in the B ₁ -B ₂ direction with respect to the arm portion 15b with the low rigidity bending portion 15c that plastically deforms and the tilt angle adjusting screw as a fulcrum. . Thus the magnetic head 1 mounted on the magnetic head mounting portions 15a _C 1 -C ₂ direction and _B 1 -B ₂ direction tilt amount can be adjusted.

In addition, the spring 12 is adjusted in the same manner as the conventional method.
The magnetic head 1 can be moved by moving the magnetic head 1 in the A ₁ -A ₂ direction by rotating the nut 11 screwed on the upper part of the shaft 10 with the magnetic head mounting plate and the cylindrical guide portion 8 a being pushed up by. .

Further, the lower plate 15d of the magnetic head mounting plate 15 is contacted by the biasing force of the X-position adjusting spring 12 in the screw direction. This is done by rotating the magnetic head 1 in the D ₁ -D ₂ direction by turning the conical X-position adjusting nut 14.

<Advantages of the Invention> As described above, the position adjusting mechanism of the magnetic head of the present invention fixes the magnetic head to the double-folded magnetic head mounting plate, and adjusts the low-rigidity bending portion to azimuth adjustment and tilt. Since it is used as a fulcrum for angle adjustment, it is not necessary to assemble the same mechanism by holding and holding a pin serving as a fulcrum on two metal plates when assembling the mechanism.

Therefore, not only the number of parts can be reduced but also the assembling work can be simplified. In addition, since one fulcrum has an integrated structure with the magnetic head mounting plate, there is no rattling and the performance can be improved.

[Brief description of drawings]

1 is a top view showing an embodiment of a magnetic head position adjusting mechanism of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a side view of FIG. 1, and FIG. FIG. 5 is a front view of the head position adjusting mechanism, FIG. 5 is a front view of FIG. 4, and FIG. 6 is a side view of FIG. In the drawing, 1 is a magnetic head, 2 is a substrate, 3 is a tilt angle adjusting screw, 4 is an azimuth adjusting screw, 5 is an AC head screw, 6
Is a spring, 7 is a pin, 8 is a board mounting arm, 8a is a cylindrical guide portion, 9 is a chassis, 9a is a spring hook, 10 is a shaft, 11 is a nut, 12 is a spring, 13 is a shaft, and 14 is an X position adjusting nut. , 15 is a magnetic head mounting plate, 15a is a magnetic head mounting portion, 15b is an arm portion,
15c shows a low-rigidity bending part.

Claims (1)

[Scope of utility model registration request] 1. A position adjusting mechanism for a magnetic head, which supports the tilt angle of the magnetic head in the front-rear direction and in the left-right direction, between a magnetic head mounting portion and a base portion which serves as a reference for adjusting the attitude of the magnetic head. Position of the magnetic head characterized by providing a low-rigidity thin-walled part and using the low-rigidity thin-walled part of the magnetic head mounting plate bent in a U-shape at the same part as a fulcrum for adjusting the tilt angle of the magnetic head Adjustment mechanism.