JP3264355B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly to a position adjusting mechanism for an audio control head of a home video tape recorder (hereinafter referred to as a VTR).

[0002]

2. Description of the Related Art In a so-called magnetic recording / reproducing apparatus, such as a VTR, which draws out a magnetic tape and performs magnetic recording / reproducing, for example, a soft tape or a magnetic tape recorded by another device is reproduced. It is a well-known technology that the magnetic recording information recorded on the tape is read by a control signal with a voice control head attached so as to satisfy the positional accuracy of the specified standard, and the device is controlled by a well-known technology. In fact, the mounting position accuracy of the voice control head needs to be quite high.

[0003] For this reason, conventionally, the mounting of the voice control head has an extremely complicated structure in order to obtain a high mounting position accuracy. In other words, with the current processing technology, it is impossible to achieve the specified (highly accurate) voice control head mounting position accuracy only with the dimensional accuracy of the component parts. The fine adjustment structure is an extremely complicated structure in the past. An example of the prior art is Japanese Utility Model Publication No. 62-13225.

[0004]

In the above prior art, the number of constituent members is very large, and it takes a lot of time to assemble, and the voice control head position adjusting mechanism can obtain a simple and high positioning accuracy. Was desired.

[0005]

In order to achieve the above object, the present invention provides a first synthetic resin member having a voice control head mounted on a base, and an eccentric engaging with the first synthetic resin member. A second synthetic resin member having a cam shape, and a head position adjusting mechanism for adjusting the position of the audio control head in the magnetic tape transfer direction by rotating the second synthetic resin member.

[0006]

The first and second synthetic resin members provided on the base are integrally formed with the front synthetic resin member through an opening hole formed on the base at one end, and the back synthetic resin member is also integrated with the front synthetic resin member. It is molded, and the synthetic resin member on the back side prevents it from falling off from the base and makes the opening hole on the base circular, so that the other end side of the synthetic resin member can rotate around this opening hole This is used for adjusting the position of the voice control head. Also, the two synthetic resin members are molded at a position apart from each other, and after molding, one of the synthetic resin members is rotated from the molding position to a position substantially reversed from the molding position. The voice control head is configured to be rotatable and used for adjusting the position of the voice control head.

[0007]

An embodiment of the present invention will be described below. FIG. 6 shows a plan view of the magnetic recording / reproducing apparatus. FIG. 6 shows a magnetic tape 2 wound around a reel 3 in a cassette 1 with a magnetic tape guide 4.
The magnetic recording medium is read out by a magnetic tape guide 5, wound around a cylinder 8 rotating in the direction a, and magnetically recorded / reproduced by a rotary head 9. At this time, the magnetic tape 2 is transported in the direction b by the capstan 6 and the pinch roller 7, and the magnetic tape 2 is moved by the sound control head 40 disposed between the cylinder 8 and the capstan 6 as is well known. A control signal recorded on the magnetic tape 2 is read to control the rotation phase of the cylinder 8 and the transfer timing of the magnetic tape 2. The present invention relates to the adjustment of the position of the audio control head 40 with respect to the direction in which the magnetic tape 2 is transported, and will be described below.

FIG. 1 is a plan view of the head position adjusting mechanism of the present invention, FIG. 2 is a sectional view of the head position adjusting mechanism of the present invention, and FIG.
5 to 5 show the state of engagement of the synthetic resin member of the head position adjusting mechanism of the present invention. Openings 101 and 102 are provided in a base 100 made of a steel plate or the like. Base 100
One end of the first synthetic resin member 20 has an opening 1 on the front side.
01, the one end of the second synthetic resin member 21 is
2 are provided by an injection molding method so as to cover them. In addition, the locking portions 25 and 26 of the synthetic resin member on the back side of the base 100 are opened through the opening holes 101 and 102, respectively.
0 and 21 are integrally formed. These locking portions 25, 2
6 are larger than the inner diameters of the opening holes 101 and 102, respectively.
It does not drop from zero. The synthetic resin members 20 and 21 contract slightly when they are cooled and solidified after injection molding.
01 and 102 and the opening 10
A slight gap is formed between the first and second members 102 and 102 so that they can be turned (FIG. 2).

The first synthetic resin member 20 has a notch 24 at the end opposite to the opening 101. The second synthetic resin member 21 is formed at a position near and away from the notch 24 of the first synthetic resin member 20 during molding (FIG. 3). Here, by rotating the second synthetic resin member 21 in the direction of the arrow c with the opening hole 102 as a fulcrum (FIG. 4), the second synthetic resin member 21 is in a position substantially reversed from the molding position so that the first synthetic resin member 21 is in the first position. Notch 2 of synthetic resin member 20
4 and engage. The engagement portion of the second synthetic resin member 21 and the first
Is formed so as to have almost no gap with the notch 24 of the synthetic resin member 20, and the second synthetic resin member 21 and the first synthetic resin member 20 can rotate in conjunction with each other (FIG. 5). ).

[0010] It is very difficult to mold the second synthetic resin member 21 and the first synthetic resin member 20 from the beginning with almost no gap from the beginning due to the structure of the injection mold, so that the above-mentioned structure is adopted. Thereby, it is possible to easily mold.

The voice control head 40 is composed of three screws 50, a spring mounting screw 60, and a spring 70.
(FIGS. 1 and 2). At this time, screw 5
0 to the first synthetic resin member 2 (not shown).
0 are respectively in contact with the surface of the base 100 through three holes (not shown). When the first synthetic resin member 20 is rotated, the inner wall of the three holes causes the tip of the screw 50 to be closed. The mounting structure is such that the cylindrical portion is moved so that the position of the voice control head 40 with respect to the transfer direction of the magnetic tape 2 can be changed.

With the head position adjusting mechanism configured as described above, the fine adjustment of the position of the audio control head 40 with respect to the transport direction of the magnetic tape 2 can be performed by the synthetic resin member 21 engaged with the notch 24 of the synthetic resin member 20. Is slightly rotated by an adjusting tool or the like. After the adjustment, the position adjustment of the head is completed by tightening the fixing screw 80.

[0013]

By using the two synthetic resin members 20 and 21 formed on the base 100, it is possible to obtain a position adjusting mechanism of the voice control head 40 which has a simple structure and can obtain high positioning accuracy. done. Base 1
Since the synthetic resin members 20 and 21 molded at 00 are molded at the same time as other parts molded on the base 100 as is well known, the productivity is extremely good.

[Brief description of the drawings]

FIG. 1 is a plan view of a head position adjusting mechanism according to the present invention.

FIG. 2 is a sectional view of a head position adjusting mechanism according to the present invention.

FIG. 3 is a view showing a state in which a synthetic resin member is engaged in the head position adjusting mechanism of the present invention.

FIG. 4 is a view showing a state in which a synthetic resin member is engaged in the head position adjusting mechanism of the present invention.

FIG. 5 is a view showing a state of engagement of a synthetic resin member of the head position adjusting mechanism according to the present invention.

FIG. 6 is a plan view of a magnetic recording / reproducing apparatus.

[Explanation of symbols]

 Reference Signs List 1 cassette 2 magnetic tape 8 cylinder 9 rotary head 20 first synthetic resin member 21 second synthetic resin member 25 fixing part 26 fixing part 40 audio control head 80 fixing screw 100 base 101 opening hole 102 opening hole

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Riki Iwama 1410 Inada, Hitachinaka-shi, Ibaraki Hitachi, Ltd. Personal Media Equipment Division (56) References Hikaru 2-110018 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G11B 5/56 G11B 5/53 103

Claims (2)

(57) [Claims] A rotating cylinder mounted with a magnetic head for recording and reproducing by moving the magnetic tape in a state where the magnetic tape is rotatably supported on a base and pulled out from a cassette by a predetermined angle; Is a magnetic recording / reproducing apparatus provided with an audio control head for separately controlling an audio signal of a magnetic tape, wherein a first synthetic resin member on which the audio control head is mounted and a first synthetic resin member are provided. A second synthetic resin member having an eccentric cam shape, and a head position adjusting mechanism for adjusting the position of the audio control head in the magnetic tape transfer direction by rotating the second synthetic resin member. Magnetic recording and reproducing apparatus. 2. The synthetic resin member formed on the front side of the base and the synthetic resin member molded on the back side of the base are integrally formed with the first and second synthetic resin members through opening holes formed in the base. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the back side synthetic resin member is provided with a head position adjusting mechanism having a portion having a diameter larger than an opening hole formed in the base. .