JPH02263305A - Rotary head device - Google Patents

Abstract

PURPOSE:To eliminate the adverse influence to a rotary upper drum attached with a magnetic head in a compact, light-weight and simple constitution by using a rotary shaft connected directly to the rotary upper drum, a fixing member which attaches the rotor of a motor to the rotary shaft, and a tacky member which is put between the rotor and the fixing member. CONSTITUTION:A rotary shaft 13 is connected directly to a rotary upper drum 11 attached with a magnetic head. A fixing member 15 is used to attach a rotor 14 to the shaft 13 and a tacky member 16 is put between the member 15 and the rotor 14. The is, the member 16 is used to prevent such an inconvenient case where the shaft 13 connecting directly the drum 11 and the rotor 14 produces the twist resonance and gives the adverse influence to the drum 11. In this case, the elasticity and the cohesive power of the member 16 prevent effectively the twist resonance and surely attenuate the twist resonance in a short time. As a result, the attachment of a flywheel, etc., is omitted to attain a compact, light-weight and simple constitution of a rotary head device together with an inexpensive price.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is characterized in that a rotating upper drum to which a magnetic head is attached and a rotating shaft directly connected to the rotor cause torsional resonance, which adversely affects the rotating upper drum to which a magnetic head is attached. The present invention relates to a rotating head device that eliminates the effects of

Conventional technology In recent years, rotating head devices have become smaller, lighter, and less expensive. Since it is extremely difficult to reduce the size, weight, and cost of a rotating head device that has a mechanism that prevents it from adversely affecting the attached rotating upper drum, torsional resonance with a simple configuration is used. Measures are required.

An example of the above-mentioned conventional rotary head device will be described below with reference to the drawings. For example, FIG. 3 shows the configuration described in Japanese Utility Model Publication No. 6327292. In the figure, 1 is a rotating upper drum to which a magnetic head is attached, 2 is a fixed lower drum, 3 is a rotating shaft held by a bearing on the fixed lower tram 2, and 4 is a rotor, which is directly connected to the rotating shaft 3. ing.

5 is a stator. Reference numeral 6 denotes a fixture, and the fixture 6 is fixed to the lower side of the rotor 4 so as to directly connect the viscoelastic body 7 and the flywheel 8 to the rotating shaft 3.

The operation of the rotary head device configured as described above will be explained below. An auxiliary vibration system is attached to the main vibration system of the motor, which is composed of a viscoelastic body and a flywheel, and has a natural frequency that is approximately equal to the main frequency. The viscoelastic torsional resonance of the vibration system can be canceled out. Therefore, it is possible to effectively prevent the rotating shaft from causing torsional resonance and adversely affecting the rotating upper drum to which the magnetic head is attached.

Problems to be Solved by the Invention However, with the above configuration, it is difficult to reduce the size, weight,
In order to reduce the price, it was necessary to attach a flywheel and the like to the outside of the rotor, which made the configuration complicated, making it difficult to achieve reductions in size, weight, and price.

In view of the above-mentioned problems, the present invention provides a rotary head device that is small, lightweight, and extremely simple in structure, and yet eliminates any adverse effects on a rotating upper drum to which a magnetic head is attached.

Means for Solving the Problems In order to solve the above problems, the rotating head device of the present invention includes a rotating shaft directly connected to a rotating upper drum to which a magnetic head is attached, and a fixing member for attaching the rotor to the rotating shaft. and an adhesive member interposed between the fixing member and the rotor.

Effect of the Invention With the above-described configuration, the present invention eliminates the possibility that the rotating shaft directly connecting the rotor and the rotating upper drum to which the magnetic head is attached causes torsional resonance, which adversely affects the rotating upper drum to which the magnetic head is attached. By using the adhesive member for this purpose, the elasticity and cohesive force characteristic of the adhesive member work effectively on torsional resonance, and the torsional resonance can be damped reliably in a short period of time.

EXAMPLE Hereinafter, a rotary head device according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall configuration of a rotary head device in a first embodiment of the present invention.

In FIG. 1, 11 is a rotating upper drum to which a magnetic head is attached, 12 is a fixed lower drum, 13 degrees is a rotating shaft that transmits the rotation of the motor to the rotating upper drum 11, 14 is a rotor, and 15 is a fixed member. be.

Fixed member 16? i. It is fixed to the rotating shaft 13 with a screw.

An adhesive member 16+ is pasted on the rotor 14 in advance, and the rotor 14 is screwed to the fixing member 15 from the axial direction.

A method for attaching the rotary head device constructed as above will be explained with reference to FIG. 2.

Figure 2 shows the installation of the rotor.

In the figure, a fixing member 16 is directly connected to the rotating shaft 13.

The adhesive layer 16b side is attached to the rotor 14 with an adhesive member 16, and the rotor 14 is fixed to the fixing member 15 with screws 17.

In the adhesive member 16 used in this example, the base layer 16& is made of vinyl chloride, and the adhesive layer 16b is an elastomer of acrylic resin having elasticity and cohesive force.

The thickness of the adhesive member 16 is 0.12ffim, and the base layer
6a is 0.1 mrtt, and the adhesive layer 16b is 0.02 mrtt.The thicker the adhesive layer 16b is, the more the vibration of the rotor 14 tends to increase. ~0.06mytt is a suitable drawing.

As described above, according to this embodiment, the rotating head device includes a rotating upper drum to which a magnetic head is attached and a motor for driving the rotating upper drum, and a rotating shaft directly connected to the rotating upper drum. By providing a fixing member for attaching the rotor of the motor to the rotating shaft, and an adhesive member interposed between the fixing member and the rotor,
This effectively acts on the torsional resonance of the rotary head device and can reliably dampen it in a short period of time, and the distorted effect can be achieved with a simple configuration.

In the first embodiment, the base layer 1st is used, but only the adhesive layer 16b may be used. Further, although the adhesive member 16 is pasted on the rotor 14 side, it may be pasted on the fixing member 16 side.

Effects of the Invention As described above, the present invention provides a rotating shaft directly connected to the rotation/transmission drum, a fixing member for attaching the rotor of the motor to the rotating shaft, and an adhesive member interposed between the fixing member and the rotor. By providing this, the following excellent effects are exhibited.

(1) When installing an adhesive member and an elastic member with the same specifications, frequency analysis of time-axis deflection and comparison shows that the degree of effectiveness of the elastic member differs depending on the elastic modulus and thickness, but an improvement of only 1 to 3 dB can be seen. However, the adhesive member can provide an effect of 10 to 2 QdB.

(2) Even when irregular vibrations are applied from the outside, torsional resonance is attenuated regardless of whether it is in the radial or thrust direction, and the attenuation speed is about three times faster.

(3) The same effect can be obtained even if the rotation, number, and moment of inertia of the rotating upper drum/rotor change without changing the specifications of the adhesive member.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the overall structure of a rotary head device according to an embodiment of the present invention, FIG. 2 is a view of the rotor shown in FIG. 1, and FIG. 3 is a sectional view of a conventional example. 11... Rotating upper drum, 12... Fixed lower drum, 13... Rotating shaft, 14... Captor, 16...
... Fixed member, 16 ... Adhesive member, 16a...
-Pace layer, 16b...adhesive layer. Name of agent: Patent attorney Shigetaka Awano and 1 other person11
- Rotation and drum I? - Fixed lower drum 13 - Rotating shaft 14 - Loader I5 - Fixed member 16 - Viscous member Fig. 2/6a --- Base 1 t6b - Viscous sj

Claims (1)

[Claims] A rotating head device comprising a rotating upper drum to which a magnetic head is attached, and a motor for driving the rotating upper drum, the rotating shaft being directly connected to the rotating upper drum, and a rotor of the motor being attached to the rotating shaft. A rotating head device comprising: a fixing member; and an adhesive member interposed between the fixing member and the rotor.