JPH0548249Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a VTR head, and in particular to a VTR head that prevents the head from becoming out of alignment after assembly.

[Conventional technology and problems to be solved]

A conventional VTR head is constructed as shown in FIGS. 4 to 6.

That is, a rotary head 22 is provided inside the upper and lower rotary drums 20 and 21 whose circumferential surfaces are in contact with the tape, with the tip thereof located between the upper and lower rotary drums 20 and 21, and the coils 23 and 23 of this rotary head 22 Lead wire 2 from
4 and 24 are provided on the lower side of the upper rotary drum 20 via the upper surface of the rotary head 22, and are guided to an annular wire holding member 26, which has a similar structure although not shown. , facing the wire holding member attached to the lower rotary drum 21.

In the VTR head configured as described above, the lead wires 24, 24 of the coils 23, 23 are temporarily connected to the upper rotary drum 20.
After being guided into the inside of the wire, the wire 25 is connected to the end of the wire 25 of the wire holding member 26 via lead wires 27, 27.

The rotary head 22 used in the VTR head configured as described above and attached to the lower side of the upper rotary drum 20 has a bifurcated tip 3 with a constant interval 36.
3, 33, and the bifurcated tip portions 33, 3 of this head base 31.
The head base 31 of the rotary head 22 is attached with a screw 35 through a hole 37 provided therein, and the Distance 3 between bifurcated tips 33, 33
6 can be attached to the upper rotary drum 20 with an accuracy of μm.

Further, in order to adjust the height of the tape and the coils 23, 23 provided at the tips of the bifurcated tip portions 33, 33, the upper rotary drum 20 is provided with the bifurcated tip portions 33, 33 of the rotary head 22. Along with providing corresponding screw holes 39, 39 on the lower surface,
Screws 40, 40 are disposed in the screw holes 39, 39, respectively, and the coils 23, 23 provided at the bifurcated tips 33, 33 are adjusted according to the screwing positions of the screws 40, 40. It's becoming like that.

However, for conventional VTR heads configured as described above, there is a soldering process in which lead wires are soldered to conduct electricity between the VTR head and the coil. Using a resin with lower thermal conductivity than ceramics makes soldering easier, and the fact that it has no electrical conductivity and is not magnetized is an advantage of manufacturing with resin, but mechanical strength is Because they are inferior to metals and ceramics, there are dimensional changes during installation, and as mentioned above, the spacing between the bifurcated tips to which the coil is attached and the height of the coil in the vertical direction relative to the tape must be measured with precision in μm. The problem is that the installation work becomes extremely difficult, and furthermore, when adjusting the height of the coil, if the head base is made of resin, the strength of the head base is weak, so the screws may deteriorate over time. There is also a problem in that the accuracy may be compromised because of this.

This idea solves the problems of the conventional ones as mentioned above, and even when the head base is made of resin, the head base can become distorted or cracked, causing the spacing between the bifurcated tips to change. To provide a VTR head that can reliably prevent changes in the vertical height between the coil and the tape.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides upper and lower rotary drums around which the tape is wound, a head base that is provided between the upper and lower rotary drums and has a bifurcated tip, and a head base that is provided at the tip of each of the head bases. In a VTR head equipped with a rotary head having a coil for reading and writing information on and from a tape, when the head base is molded, a cylindrical portion and a rotary head provided approximately in the center of the cylindrical portion to form a flat plate shape are provided. and a flange whose distal end is forked and reaches halfway to the bifurcated distal end of the head base, and a flange provided on the lower surface of the bifurcated distal end of the flange and reaches the lower surface of the head base. A reinforcing member consisting of a hanging part is buried so that its cylindrical part is positioned in the vertical direction, and a screw to be screwed into the screw hole of the rotary drum is inserted into the cylindrical part of the reinforcing member to form a rotary head. is attached to the rotary drum, and on the other hand, push-up screws are screwed into the screw holes provided in the rotary drum at positions corresponding to the hanging parts of the reinforcing member, and the push-up screws press the lower surface of the hanging parts, thereby removing the tape. A means for adjusting the height of the coil relative to the height of the coil is adopted.

[Effect]

By adopting the above-mentioned means, this invention prevents the rotary head from being distorted or damaged due to the action of the cylindrical part of the reinforcing member even if a large tightening force is applied when it is attached with screws. Furthermore, even if the height of the coil relative to the tape is adjusted using both push-up screws, the adjustment can be made reliably by the action of the reinforcing member, and since it is the reinforcing member that comes into contact with the push-up screw, it will not change over time. It is also possible to reliably prevent the height of the coil from shifting.

〔Example〕

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

A VTR head according to this invention is shown in FIGS. 1 to 3, and like the conventional one, the rotary head 2 consists of a head base 3 and coils 4 for reading and writing information to and from the tape. However, the head base 3 is made of resin.

The head base 3 has bifurcated tip portions 7, 7 which are bifurcated and held at a constant interval 8, and during molding, the upper and lower ends of the head base 3 are attached to the upper and lower surfaces of the head base 3. Coming to
A cylindrical portion 9a having a hollow portion 5, and this cylindrical portion 9a
A flange part 9b is provided at approximately the center of the flange part 9b so as to spread outward, and the tip part is formed into a bifurcated shape and reaches halfway between the bifurcated tip parts 7, 7.
A reinforcing member 9 is embedded, which is provided on the lower surface of the bifurcated portion of b, and consists of hanging portions 9c, 9c exposed on the lower surface of the head base 3, as shown in detail in FIGS. 2 and 3. There is.

The rotary drum 1 to which the rotary head 2 configured as described above is attached has a screw hole 12 communicating with the hollow part 5 of the cylindrical part 9a of the reinforcing member 9, and a hanging part 9c of the reinforcing member 9. ,9
The rotary head 2 has screw holes 10, 10 corresponding to the exposed lower surface of the rotary head 2, and the coils 4, 4 are attached to the tips thereof. It is attached to the rotary drum 1 by screwing into the screw hole 12 of the rotary drum 1.

Furthermore, the screw holes 10, 1 of the rotary drum 1
Adjustment screws 11, 11 are screwed into the reinforcing member 9, respectively, and the tips of both adjustment screws 11, 11 are in contact with the lower surfaces of the hanging portions 9c, 9c of the reinforcing member 9.

The reinforcing member 9 is made of ceramics, metal, cemented carbide, or the like, which has high compressive strength, high Young's modulus, and high mechanical strength.

In a VTR head configured as above,
When attaching the rotary head 2 to the rotary drum 1 with the screws 6, the presence of the cylindrical portion 9a makes it difficult to attach the screws 6.
Even if the reinforcing member 9 is strongly tightened, this tightening force acts on the cylindrical portion 9a of the reinforcing member 9, so that the resin head base 3 will not be deformed, distorted, or damaged. The spacing 8 between 7 and 7 is maintained. Therefore, since the spacing before attachment is maintained, it is possible to attach with an accuracy of μm.

In addition, when the adjusting screws 11, 11 are operated to adjust the gap between the coils 4, 4 of the bifurcated tip portions 7, 7 and the tape, the adjusting screws 11, 1
Since the tip of 1 is not made of resin but comes into contact with the hanging portions 9c, 9c of the reinforcing member 9, which is made of metal or the like and has high strength, the adjustment screws 11, 11 do not dig in over time, and the bifurcated tip The parts 7, 7 can be held at a constant height, and the gap between the coils and the tape can be adjusted independently according to the amount of adjustment of the adjusting screws 11, 11. It is something.

[Effect of idea]

This invention has the above-mentioned structure, so that even when the rotary head is attached to the rotary drum, even if the tightening force is applied by the screw,
This allows the head base to maintain the delicate spacing between the bifurcated tips and keep the coil spacing constant without causing deformation, distortion, or damage. Since the adjustment screw does not dig into the head base during adjustment, it does not change over time and has excellent effects such as reliable adjustment.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the main parts of the VTR head according to this invention, Fig. 2 is a sectional view taken along line A-A' in Fig. 1,
Figure 3 is a schematic bottom view showing the rotary head of the VTR head based on this invention, and Figure 4 is a schematic bottom view of the rotary head of the VTR head based on this invention.
5 is a schematic diagram showing the main part of FIG. 4, and FIG. 6 is a sectional view taken along line B-B' in FIG. 5. 1, 20, 21... rotary drum, 2, 2
2... Rotary head, 3, 31... Head base, 4, 23... Coil, 5... Hollow part, 6,
35, 40... Screw, 7, 33... Tip, 8,
36... Spacing, 9... Reinforcing member, 9a... Cylindrical part, 9b... Flange part, 9c... Hanging part, 10, 12
...Screw hole, 11...Adjustment screw, 24, 27...
Lead wire, 25... wire, 26... wire holding member.

Claims (1)

[Scope of utility model registration request] Upper and lower rotary drums around which the tape is wound,
A VTR head is provided with a head base provided between the upper and lower rotary drums and having a bifurcated tip, and a rotary head provided at each tip of the head base and having a coil for reading and writing information on the tape. At the time of molding the head base, a cylindrical part and a cylindrical part provided approximately at the center of the cylindrical part, having a flat plate shape and a forked tip part, extend halfway up the bifurcated tip part of the head base. A reinforcing member consisting of a reaching flange and a hanging part provided on the lower surface of the bifurcated tip of the flange and reaching the lower surface of the head base,
Bury it so that the cylindrical part is positioned vertically,
A rotary head is attached to the rotary drum by inserting a screw to be screwed into the screw hole of the rotary drum into the cylindrical part of the reinforcing member, and a rotary head is provided at a position corresponding to the hanging part of the reinforcing member of the rotary drum. A VTR head characterized in that the height of the coil relative to the tape is adjusted by screwing push-up screws into the screw holes, and pressing the bottom surface of the hanging portion with the push-up screws.