JPS62120602A - Tape guide drum device - Google Patents

Abstract

PURPOSE:To reduce the size of a tape guide drum device as small as possible by fixing a main spindle on a lower cylinder pivotally through a disk, positioning a rotary transformer fixing side on the opposite side to the main spindle fixing side on the lower cylinder and arranging a fixing board oppositely to the rotary transformer rotation side. CONSTITUTION:A rotor 50 rotated by a stator 52 rotates an upper cylinder 42 together with disk 48. A signal outputted from a magnetic head 54 fitted to an upper cylinder 42 is transmitted under non-contact state to the rotary transformer fixing side 58 through the rotary transformer rotation side 56 to be rotated integrally with the upper cylinder 42. The fixing side 58 is fixed on the fixing board 60 and the fixing board 60 is fixed on the main spindle 44 fixed on the lower cylinder 40 through the disk 48, the upper cylinder 42 and the rotary transformer rotation side 56 so that the rotation side 56 is opposed to the fixing side 58 through a gap.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a tape guide drum device that can be used in a magnetic recording and reproducing device.

2. Description of the Related Art In recent years, tape guide drum devices have been required to be smaller and lighter as magnetic recording and reproducing devices have become smaller.

An example of the conventional tape guide drum device mentioned above will be described below with reference to the drawings.

FIG. 2 shows a cross section of a conventional tape guide drum device. In FIG. 2, 10 is a lower cylinder, 12 is an upper cylinder, 14 is a main shaft rotatably supported by a ball bearing 16 provided in the lower cylinder 10iC, and 18 is fixed to the main shaft 14, and 18 is a main shaft that supports the earth cylinder 12. The held disk, 2° is a rotor of a motor for rotationally driving the disk 18, 22 is a stator for driving the rotor 2o, 24 is a magnetic head fixed to the upper cylinder 12, and 26 is the magnetic head. 24 is a rotating side of a rotary transformer that transmits signals; 28 is a fixed side of the rotary transformer that is paired with the rotating side of the rotary transformer 26 and transmits signals without contact; 30 is a fixed side that holds the fixed side of the rotary lance 28; 32 is the lower cylinder 1
This is a support stand fixed to o and for supporting the fixed stand 30.

The operation of the conventional tape guide drum device configured as described above will be described below.

First, the rotor 2o is rotationally driven by the stator 22.
rotates the upper cylinder 12 together with the disk 18. A signal from the magnetic head 24 provided on the upper cylinder 12 is transmitted to the fixed side 28 of the rotary transformer in a non-contact manner through the rotating side 26 of the rotary transformer, which rotates together with the upper cylinder 12. The rotary transformer fixed side 28 is fixed to the fixed base 3o, and the fixed base 3o is fixed to the fixed base 3o.
° is by the support stand 32 fixed to the lower cylinder 10,
The fixed side 28 of the rotary transformer and the rotating side 26 of the rotary transformer face each other and are supported so as not to come into contact with each other.

Problems to be Solved by the Invention However, the above configuration requires a support stand 32 and requires an extremely large space because the upper cylinder 12 must be mounted in an over-parts manner. Furthermore, in order to accurately maintain the gap between the rotary transformer rotating side 26 and the rotary transformer fixed side 28, it is necessary to make the support base 32 robust.
It was also heavier. Furthermore, in order to fix the support stand 32 to the outer periphery of the lower cylinder 1o, the lower cylinder 1
The outer periphery of the tape guide drum was deformed, causing poor performance as a tape guide drum.

In view of the above-mentioned problems, the present invention has been developed to fix the main shaft, pass through the rotating part, and provide a fixed side of the rotary transformer at the tip, thereby eliminating the need for a support stand and realizing lighter weight, smaller size, and higher precision. The present invention provides a tape guide drum device.

Means for Solving the Problems In order to solve the above problems, the tape guide drum device of the present invention includes a magnetic head for recording and reproducing video signals, and a rotating head for transmitting the video signals from the magnetic head. a rotating means including a side rotary transformer and rotationally driven by a motor, a fixed shaft penetrating the center of rotation of the rotating means and bearing the fixed shaft, and holding and fixing the fixed shaft;
A rotating side transformer of the rotary transformer is provided with a fixed part including a fixed drum that guides the magnetic tape, and a rotating side transformer of the rotary transformer is provided on the opposite side of the rotating body from the side fixed to the fixed drum of the fixed shaft. It has a configuration in which a fixed side transformer is disposed opposite the section.

Function The present invention eliminates the need for a support stand due to the above-described configuration, thereby realizing weight reduction, size reduction, and high precision.

Embodiments Hereinafter, tape guide drum devices according to embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a sectional view of an embodiment of the present invention.

In FIG. 1, 40 is a lower cylinder, 42 is an upper cylinder, 44 is a main shaft fixed to the lower cylinder 4o, 48 is a disk rotatably supported on the fixed main shaft 44 by a hydrodynamic fluid bearing, and 50 is the main shaft fixed to the lower cylinder 4o. A rotor of a motor for rotationally driving the disk 48; 52 a stator for driving the rotor 5o; 54 a magnetic head fixed to the upper cylinder 42; 66 a rotor for transmitting signals from the magnetic head 54. The rotary transformer rotating side 68 is a fixed side of the rotary transformer that is paired with the rotary transformer rotating side 66 and transmits signals in a non-contact manner, and 6o is a fixed base that holds the rotary transformer fixed side 58.

The operation of the tape guide drum device of this embodiment constructed as described above will be described below with reference to FIG.

First, the rotor 50 is rotationally driven by the stator 62.
rotates the upper cylinder 42 together with the disk 48. A signal from a magnetic head 54 provided in the upper cylinder 42 is transmitted to the rotary transformer rotating side 56 through a rotary transformer rotating side 56 that rotates together with the upper cylinder 42 in a non-contact manner. The rotary transformer fixed side 58 is fixed to the fixed base 6o, and the fixed base 6o is fixed to the fixed base 6o.
° is a main shaft 44 fixed to the lower cylinder 4o, and the disk 48. Upper cylinder 42. Rotary transformer rotation side 5
The rotating side 66 of the rotary transformer and the fixed side 58 of the rotary transformer are fixed to face each other with a gap between them.

Effects of the Invention As described above, according to the present invention, the main shaft is fixed to the lower cylinder, and the rotary transformer fixed side is located on the opposite side of the main shaft fixed to the lower cylinder. However, since the fixed base is arranged so as to face the rotation side of the rotary transformer, the tape guide drum device can be extremely miniaturized.

Further, since a support stand is not required, the weight of the tape guide drum device can be reduced, and since nothing is attached to the outer periphery of the lower cylinder, the accuracy of the lower cylinder is not deteriorated.

In this embodiment, the rotary transformer rotating side 56 is fixed to the upper cylinder 42, but the rotary transformer rotating side 66 may be fixed to the disk 48. Also, the disk 48 is fixed to the upper cylinder 42 by a hydrodynamic bearing. Although the example is shown in which it is supported by the main shaft 44, it may be supported by a ball bearing.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional tape guide drum device. 40...Lower cylinder, 42...Upper cylinder, 44...Main shaft, 48...Disc, 6o...Rotor, 52... ... Stator, 64 ... Magnetic head, 56 ... Rotary transformer rotating side, 58 ... Rotary transformer fixed side, 60 ... Fixed base. Name of agent: Patent attorney Toshio Nakao and one other name
1 Figure 40-- Bottom/link 42-- Upper link. q-～-i glaze phrase-1-task-m-lobe 52-1-s data δ4--tomato head 66-m-rotawatofun entering difficulty soft defeat 56---roksotofunsu I! ] Hole hole 460-
-- LII white figure 2, ? /7

Claims (1)

[Claims] A rotating means that includes a magnetic head for recording and reproducing video signals and a rotating side rotary transformer for transmitting the video signal from the magnetic head, and that is rotationally driven by a motor, and that passes through the center of rotation of the rotating means. a fixed part including a fixed shaft that supports the fixed shaft and a fixed drum that holds and fixes the fixed shaft and guides the magnetic tape; A tape guide drum device comprising: a stationary transformer disposed opposite to a rotating transformer portion of the rotary transformer on the opposite side thereof.