JP2001155317A - Video tape recorder rotating drum contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide easy manufacturing, high quality, light weight and low cost and also to reduce motor load for rotation. SOLUTION: The device is equipped with a contact 15 for which contact points 17, 18 are formed by bending both ends of a wire material for a spring curved in a U-shaped bend, and a holder 14 which has a groove 19 for inserting the contact 15 and which is formed with a wall for fixedly engaging with the Ushaped bend of the contact 15 in the groove 19. The contact points 17, 18 of the contact 15 are in press-contact with the terminal 23 of a magnetic head 13 and the terminal 24 of a rotary transformer-coil 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drum contact device used for a stationary or portable video tape recorder.

[0002]

FIG. 13 is an exploded perspective view showing an example of a conventional video tape recorder rotary drum contact device. The video tape recorder rotary drum device has a fixed drum portion and a rotary drum portion. The rotating drum unit includes a rotating drum 1, a magnetic head 2, a contact 3, a holder 4, a rotary transformer coil 5, a rotating shaft (not shown), a rotation driving motor, and the like.

The magnetic head 2 has a function of recording and reproducing signals on a magnetic tape (not shown) passing through the outer periphery of the rotary drum 1, and has two, three, and five signals for video and audio.
A plurality of, such as a plurality, are fixed to the lower surface side of the rotary drum 1, and the terminals 6 of each magnetic head 2 are electrically connected to the terminals of the rotary transformer coil 5 via the contacts 3.

As the contact 3, a metal plate as shown in an enlarged perspective view of FIG. 14 or a metal plate which has been subjected to surface treatment by plating or the like is used. As shown in FIG. 15, the contacts 3 are fixed by integral molding, bonding or the like, and two contacts 3 are required for one magnetic head 2. 13 to 1
The conventional contact 3 shown in FIG. 5 is obtained by integrally forming a metal plate bent in a U-shape with a holder 4 made of resin, and the contact 3a on the magnetic head side is connected to the terminal 6 of the magnetic head 2 (see FIG. 13).
The terminal of the rotary transformer coil 5 is wound around and connected to the contact 3b of the contact 3 on the rotary transformer side by soldering so as to make contact at a predetermined position.

The rotary transformer coil 5 is incorporated in the groove of the soft ferrite plate 7 and is fixed to the lower surface side of the holder 4, and is rotated so that the terminal 6 of the magnetic head 2 contacts the contact 3 a of the contact 3 at a predetermined position. Drum 1, holder 4
Is assembled to complete the video tape recorder rotating drum section.

FIG. 16 is an enlarged perspective view of another example of a conventional contact. The contact 8 is manufactured by mechanically bending a material obtained by stamping a thin metal plate with a press. The contact 8b on the magnetic head side is a contact on the rotary transformer side, and as shown in FIG.
And fixed in the groove 10. Since the stamped metal surface of the contact 8b on the rotary transformer side is in direct contact with the contact on the rotary transformer coil side, a method of adding a surface treatment such as plating after punching is generally used to improve the conductivity of the contact portion. Has been adopted.

[0007]

As described above, in the conventional contact, since a plate material is punched by a press, punching scum is generated, the material yield is low, and the cost is high.
There is also a problem that an expensive mold is required due to the complicated shape.

In addition, since surface treatment such as plating needs to be additionally performed after machining of contacts, a jig for plating is also required, and the number of steps is increased, so that the cost is increased. Even if it is applied, there is a quality problem that affects the conductivity due to variations in plating thickness, burrs, and irregularities because plating is performed on the pressed end face, which is a contact point.

Further, since the weight of the press-processed product cannot be reduced, the load on the motor of the rotating head rotating at a high speed is increased, and there is a problem that power saving is hindered. The present invention solves such a conventional problem, and provides a video tape recorder rotating drum contact device that is easy to manufacture, has good quality and is lightweight, is low in cost, and can reduce the motor load for rotation. It is intended for.

[0010]

According to a first aspect of the present invention, there is provided a contact having a U-shaped bent portion and a contact formed by bending both ends of a spring wire bent to form a contact, and a groove for inserting the contact. A holder having a wall for engaging and fixing a U-shaped bent portion of the contact in the groove, wherein the contact of the contact is pressed against a terminal of the magnetic head and a terminal of the rotary transformer coil. It relates to a contact device for a video tape recorder rotary drum, which uses a wire for a spring, so that there is no wasted material such as a pressed product, the cost is light and the motor load for rotating is light, and the spring for the holder is light. It is easy to fix the wires.

According to a second aspect of the present invention, there is provided a contact device for a rotary drum of a video tape recorder according to the first aspect, wherein a coiled winding portion is formed on the spring wire. With this elasticity, the pressure contact with the terminals of the magnetic head and the terminals of the rotary transformer coil and the fixation to the holder are ensured.

According to a third aspect of the present invention, there is provided the contact device for a rotary drum of a video tape recorder according to the first aspect, wherein the wire for the spring is subjected to a surface treatment by metal plating. Therefore, the quality of the contact can be improved without performing the additional plating surface treatment.

According to a fourth aspect of the present invention, the spring wire is a spring wire having a diameter of 0.5 mm or less or a side of 0.5 m.
4. A video tape recorder rotating drum contact device according to claim 1, wherein a spring wire having a square cross section of m or less is used.
The wire diameter is preferably as thin as possible for the purpose of weight reduction, but the upper limit is 0.5 mm in wire diameter in order to obtain the necessary clamping force for fixing to the holder and the necessary pressing force against the contact.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of an example of an embodiment of the present invention, in which a rotary transformer coil 11,
Rotary drum 12, magnetic head 13, resin molded holder 1
4. A contact 15 fixed to the holder 14 is provided.

FIG. 2 is an enlarged perspective view showing a contact 15 and a main part of the resin-molded holder 14. The contact 15 has a wire diameter of 0.3 which has been subjected to Au plating surface treatment in advance.
A spring wire made of a 5 mm phosphor phosphor bronze wire, the middle portion of which is bent to form a U-shaped bent portion 16, and both ends are bent downward to contact the magnetic head 13 (see FIG. 1). 17, the contact 18 on the rotary transformer coil 11 side is formed by a series of operations by a wire processing machine.

The holder 14 is provided with a groove 19 for inserting and fixing the above-mentioned contact 15 as shown in FIGS. 1 to 4, and an end in the groove 19 has a contact as shown in FIG. A wall 20 is formed to engage and secure the 15 U-shaped bends 16. A contact 15 is provided on the upper surface of the holder 14 at a position opposite to the groove 19 of the wall 20.
A concave guide 21 (see FIGS. 2 and 3) for regulating the position on the contact 17 side is provided.

When assembling the contact device for a rotary drum of a video tape recorder according to the present invention shown in FIG. 1, the contact 15 is inserted into the groove 19 of the holder 14 as shown in FIG. 16 engages the wall 20 of the groove 19. As a result, the U-shaped bent portion 16 strongly clamps the wall 20 by the spring force, the contact 15 is fixed in the groove 19 of the holder 14, and the contacts 17 and 18 are held in a state protruding from a predetermined position on the surface of the holder 14. Is done.

At a predetermined position on the lower surface side of the rotary drum 12 shown in FIG. 1, a magnetic head 13 is fixed with screws or the like, and a holder 14 to which the above-described contact 15 is fixed is mounted on the rotary drum 1.
2, the protruding portion on the upper surface of the holder 14 is inserted into the hole 22 of the rotating drum 12 so that the contact 15
And the holder 14 is fixed to the lower surface of the rotating drum 12 with screws or the like.

The rotary transformer coil 11 is approached from the upper side of the rotary drum 12, and the position is adjusted so that the terminal 24 of the rotary transformer coil 11 contacts the contact 18 of the contact 15.
1 is fixed to the upper surface side of the rotary drum 12 with screws or the like.

As a result, the magnetic head 13 and the rotary transformer coil 11 are connected via the contact 15, and the rotary drum portion of the stationary or portable video tape recorder is completed.

5 to 12 show various examples of the embodiment of the contact 15 of the present invention. FIG. 5 shows the contact 15 in which the contact 17 on the magnetic head 13 side is formed downward, and FIG. The contact 15 in which the contact 18 on the rotary transformer coil 11 side is formed downward, FIG.
8 shows a contact 15 in which both a contact 17 on the magnetic head 13 side and a contact 18 on the rotary transformer coil 11 are formed downward. FIG. 8 shows a coiled wire for a spring so as to be continuous with a U-shaped bent portion 16. The contact 15 is formed by forming a wound portion 25 of the contact member 15 and increasing the holding force of the holder 14 against the wall 20 (see FIG. 3) so that the holder 15 is securely fixed to the holder 14. A contact 15 in which a coil-shaped winding portion 25 is formed in a portion close to the contact 15 and the pressure contact force of the contact 18 against the terminal 24 of the rotary transformer coil 11 is increased, and FIG.
FIG. 11 shows a contact 15 formed by bending an end of a spring wire to form a coiled winding portion 25 to form a contact 18, and FIG.
The contact 15 uses a spring wire having a square cross section of not more than mm, and can be manufactured by a series of operations using a wire processing machine.

The spring wire used for the contact 15 of the present invention can be Cu, phosphor bronze, Be-Cu, other copper alloys, stainless steel, piano wire, high steel wire, or any other surface-treated material. is there.

[0023]

According to the first aspect of the present invention, since the spring wire is used for the contact, there is no waste of material such as a pressed product, no mold is required, and the volume and weight can be reduced. In addition, the motor load for rotating the rotating drum is reduced, and power consumption is reduced, and the contact can be fixed to the holder only by engaging the U-shaped bent portion of the contact with the wall of the groove. There is a great effect that the cost merit is shortened.

According to the second aspect of the present invention, the elasticity of the winding portion ensures the pressure contact with the terminals of the magnetic head and the terminals of the rotary transformer coil and the fixation to the holder, eliminating the need for laborious steps such as soldering and bonding. There is an effect.

The third aspect of the invention eliminates the need for an additional plating surface treatment in a subsequent step, and has the effect of improving the quality of the plated portion.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an example of an embodiment of the present invention.

FIG. 2 is an enlarged perspective view showing a main part of an example of the embodiment of the present invention.

FIG. 3 is a side view showing an example of a contact mounting state of the present invention in a partial cross section.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a side view showing another example of the embodiment of the contact of the present invention.

FIG. 6 is a side view showing still another example of the embodiment of the contact of the present invention.

FIG. 7 is a side view showing still another example of the embodiment of the contact of the present invention.

FIG. 8 is a side view showing still another example of the embodiment of the contact of the present invention.

FIG. 9 is a side view showing still another example of the embodiment of the contact of the present invention.

FIG. 10 is a side view showing still another example of the embodiment of the contact of the present invention.

FIG. 11 is a side view showing still another example of the embodiment of the contact of the present invention.

FIG. 12 is a perspective view showing still another example of the embodiment of the contact of the present invention.

FIG. 13 is an exploded perspective view showing an example of a conventional video tape recorder rotating drum contact device.

FIG. 14 is an enlarged perspective view of an example of a conventional contact.

FIG. 15 is a perspective view showing a fixed state of the contact in FIG. 14;

FIG. 16 is an enlarged perspective view of another example of a conventional contact.

FIG. 17 is a perspective view showing a fixed state of the contact of FIG. 16;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Rotary transformer coil 13 Magnetic head 14 Holder 15 Contact 16 U-shaped bent part 17, 18 Contact point 19 Groove 20 Wall 23, 24 Terminal 25 Winding part

Continued on the front page (72) Inventor Hitoshi Sato 3-2-22 Harumi, Chuo-ku, Tokyo Mitsubishi Steel Corporation Spring Business Division (72) Inventor Daigo Ito 3-22-22 Harumi, Chuo-ku, Tokyo Mitsubishi Steel Corporation F-term in the company spring division (reference) 5D036 AA14 AA17 CC04 CC97

Claims (4)

[Claims] A contact formed by bending both ends of a spring wire having a U-shaped bent portion to form a contact;
A holder having a groove for inserting the contact and having a wall formed therein for engaging and fixing a U-shaped bent portion of the contact, wherein the contact of the contact is a terminal of a magnetic head and a terminal of a rotary transformer coil. A contact device for a rotating drum of a video tape recorder, characterized in that the contact device is brought into pressure contact with the rotary drum. 2. The contact device for a rotary drum of a video tape recorder according to claim 1, wherein a coiled winding portion is formed on the spring wire. 3. The contact device for a rotary drum of a video tape recorder according to claim 1, wherein the spring wire is surface-treated by metal plating. 4. A spring wire having a wire diameter of φ0.5 mm or less or a rectangular cross-section spring having a side of 0.5 mm or less is used.
2. The contact device for a video tape recorder rotary drum according to item 1.