JPS5819704Y2 - magnetic recording and reproducing device - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a magnetic recording/reproducing device which is practical for preventing vibration of an audio head in a magnetic recording/reproducing device and reducing wow.

A magnetic recording/reproducing device (hereinafter simply referred to as a VTR) with a rotating head
Unlike a normal tape recorder, the VTR requires a structure to support the audio head that is unique to VTRs.

Its typical structure will be explained with reference to FIGS. 1 and 2.

FIG. 1 is an assembled view of the vicinity of the audio head, and FIG. 2 is an exploded view thereof.

Note that the same numbers in the figures indicate the same things.

The head 1 (hereinafter referred to as the head) and the audio alcolend 2, which have a built-in audio head and control head, are fixed to a head mounting board 3 with screws 11 and 12, and the board 3 is fixed with screws 31 and 12, respectively. X mentioned later in 32
It is attached to the pupil adjustment board 4.

The screws 31 and 32 are set so that the gap of A/C head 1 is tape 1.
0 This is a screw for adjusting the inclination of A/C hand 1 so that it is perpendicular to the direction of movement.
This is for adjusting the degree of contact between the D head 1 and the tape 10.

Note that the screw 32 presses down the board 3 via a spring 36.

In a VTR, in order to maintain compatibility between each deck, the distance (X
value) must be kept constant.

The X-pupil adjustment board 4 is for this purpose, and the
It is attached to the substrate 5 through 2'.

Then, the board 5 is placed on the annular springs 66 and 76 arranged on the deck main board 8.

An annular spring holding member 6 whose portion is fitted into the spring 66, 76 up to the portion having the bosses 65', 15'.
5 and 75 are placed in between.

6.7 is a post fixed perpendicularly to the main body board 8, passing through the spring 66, 76 and the spring holding members 65, 75, and the board 5. Furthermore, the post 6 is used to regulate the running height of the tape 100. Limiter means 61°62.63 are installed.

Therefore, the board 5 is fitted with an adjustment nut 64 which is screwed into the upper end threaded part 6' of the post 6 equipped with a limiter means 61, 62, 63 for regulating the running height of the tape 100, and which is threaded into the upper end threaded part 1' of the post 7. By tightening the adjusting nut T4, the spring 66, 76 is substantially fixed.

Therefore, between the substrate 5 and the main substrate 8, there is a spring 6 which is an elastic body.
6.76, so A/
The overall height of C hand 1 is 64. The position can be adjusted by adjusting the tightening condition of γ4.

The limiter means 61 to 63 have an inner diameter slightly larger than the outer diameter of the post, and collars with different outer diameters are attached to the post 6, and the height of the tape can be adjusted by an adjustment pad 64. It seems to be adjusted.

As is clear from the above explanation, the height of A/C hand 1,
Limiter means 61 for regulating the height at which the tape 100 travels
- 63 are assembled in advance with mechanical precision so that they have an appropriate height relationship, and when the limiter means 61 - 63 are moved up and down with the tape height adjustment nut 64, the limiter means 61 - 6
3, the height of the A/C head 1 is also changed.

Since the limiter means 61 to 63 are essential in a VTR that requires precise tape running, the board 5 is usually mounted with springs 66 and γ6 interposed between it and the main board 8. be.

However, with the configuration shown in FIG. 1, the spring 66.7
6 and a mass system on the board 5 form a resonant system, which is excited by vibrations from a rotating body such as a motor attached to the deck, causing the A/C head 1 to vibrate at several hundred hertz, causing audio wah and wah components. It appears.

Wah component due to A/C hand 1 vibration is 0.1% RMS
However, to date, no effective countermeasures have been taken, although it has become an important issue to prevent vibrations in A/C hand 1 as a problem of reducing wow and flank.

The present invention proposes a practical and effective device for preventing A/C hand vibration without interfering with conventional adjustment functions.

As mentioned above, the vibration of the A/C hand 1 is caused by the spring 66, γ
6 and the mass system on the substrate 5.

Therefore, by some means, the vibration of the springs 66 and 76 is caused by the vibration of the substrate 5.
It is only necessary to prevent the mass from being transmitted to the spring 66, 76, or to prevent the mass on the substrate 5 from loading on the spring 66, 76.

The present invention focuses on this point, and the spring holding members 65, 7
5 and posts 6.7, resonance of the Q/C head 1 is prevented.

For example, by adjusting the tape running height using a limiter means,
/C After all adjustments such as head inclination adjustment are completed, the spring press members 65, 75 and the post 6.1 may be fixed by the fixing means provided on the spring press members 65, 75.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a side view showing an embodiment of the present invention, and γ1 is a cent screw provided on the boss 75' of the spring holding member γ5.

After each adjustment of the head supported on the board 5 is performed by the Nand 74 screwed into the head of the post γ, the cent screw 71 is tightened to the post 7, and the spring holding member 75 is tightened.
If the spring T6 and the post 7 are fixed, the mass system on the spring T6 and the substrate 5 will be in the same state as if they were separated without interacting with each other, and vibration with a high peak due to resonance will not occur.

Further, the spring holding member 75 can be fixed by another means, such as an adhesive, instead of being fixed by the center screw 7T.

Furthermore, as shown in FIG.
Vibration of A and 'C hands 1 can be prevented.

Although FIGS. 3 and 4 show only the fixing of the post 7 on one side, fixing of the spring presser member 65 and the post 6 shown in FIG. 2 can also be done in the same way.

Since the present invention has the above-mentioned configuration, it exhibits an excellent effect in reducing wow by preventing the vibration of the audio head by a simple means without impairing conventional functions.

[Brief explanation of the drawing]

Fig. 1 is a side view of the A/C head, Fig. 2 is an exploded view of the man/C head, Fig. 3 is a side view showing one embodiment of the invention, and Fig. 4 is another embodiment of the invention. FIG. 1... A/C head, 5... Board supporting A/℃ head, 6, 7... Post, 5...-
...Main board, 10...Tape, 64,7
4...Nan), 65°75...Spring holding member, 66.76...Spring, γ1...
・St screw.

Claims (1)

[Scope of utility model registration request] A substrate supporting an audio head placed on an annular elastic body disposed on the main body substrate with an annular elastic body holding member interposed therebetween is fixed perpendicularly to the main body substrate, and the elastic body and the elastic body holding member are fixed perpendicularly to the main body substrate. In a magnetic recording/reproducing device that is positioned by an adjusting nut screwed into an upper end screw portion of a post passing through a member and a substrate, the mass system on the substrate supporting the audio head and the elastic body mutually act as a vibration system. 1. A magnetic recording and reproducing apparatus characterized in that the elastic body press member is provided with a fixing means for fixing the elastic body press member and the post in order to prevent the post from being separated.