JPH04366459A - Tape guide drum device for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain a tape guide drum device for magnetic recording and reproducing devices which can incorporate a circuit without increasing its overall thickness and, at the same time, can be easily used in a shared state by rotary transformers of a plane and cylinder types without changing the design of its upper and lower drums and is reduced in size and weight so that the drum device can be easily assembled. CONSTITUTION:Since this tape guide drum device is constituted in such a way that a magnetic head 2 is mounted on the inner bottom surface 11b of a cup-like upper drum 11 with an opened top by protruding the front end section of the head 2 from an opening 14 and the rotating side 32 of a cylindrical rotary transformer 31 is incorporated in an upper drum 14 and, at the time, the head 2 is mounted on a lower drum by fixing the fixed side 33 of the transformer 31 to a fixing-side holder 34, a space A can be formed above the head 2. Because of this space A, the constitution of the rotary transformer 31 becomes easier and a signal circuit, etc., can be mounted in the space A. At the same time, the size and weight of the drum device can be reduced. In addition, functional members can be assembled after inserting them from the opening of the drum 11, this the drum device can be easily assembled.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape guide drum device for a magnetic recording/reproducing device that is compact and lightweight.

0002

2. Description of the Related Art In recent years, tape guide drum devices (hereinafter referred to as tape guide drum devices) for magnetic recording and reproducing devices are required to be smaller and lighter, have higher precision, lower cost, and higher productivity.

A conventional tape guide drum device will be described below with reference to FIG. In the figure, 1 is an upper drum, and a magnetic head 2 is attached to the surface facing the lower drum 3 by adhesive. The upper drum 1 is attached to a shaft 5 and rotatably supported by the lower drum 2 by a bearing 6. Reference numeral 7 denotes an electric motor, the rotor of which is fixed to the shaft 5 and the stator fixed to the drum 3, and drives the upper drum 1 to rotate. Reference numeral 8 denotes a rotating plane transformer, which is composed of a pair of fixed side 9 and rotating side 10, where the fixed side 9 is mounted on the lower drum 3 and the rotating side 10 is mounted on the upper drum 1 facing the fixed side 9 with a gap. ing.

0004

In such a conventional tape guide drum device, the space near the rotary plane transformer 8 surrounded by the upper drum 1 and the lower drum 3 on which the magnetic head 2 is mounted is small; It is difficult to incorporate circuits that convert or amplify signals from the magnetic head 2 into electrical, magnetic, optical signals, etc., and other circuits. It was necessary to make it larger. Further, the configuration of the rotary transformer 8 is significantly different between a planar type and a cylindrical type, and there is a problem in that a dedicated upper drum and lower drum must be designed respectively depending on the planar type and the cylindrical type.

[0005] The present invention solves the above problems, and allows a circuit to be installed inside the tape guide drum device without changing its overall thickness. The purpose of the present invention is to provide a tape guide drum device that is compact, lightweight, and easy to assemble, with excellent compatibility without changing the design of the drum and the lower drum.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a lower drum in which an electric motor is installed, and an upper drum which is rotatably supported by the lower drum and rotates with a magnetic tape wound thereon. and at least one magnetic head attached to the upper drum for recording and reproducing video signals, and at least one set of rotary transformers for transmitting the video signals of the magnetic head, and the upper drum is formed into a cup shape. the bottom surface of the upper drum is opposed to the lower drum, at least one opening is provided in the side surface of the bottom of the upper drum, and the magnetic head is attached to the inner bottom surface of the upper drum with its tip protruding from the opening. The rotating side of the rotating transformer is mounted in the upper drum, and the fixed side of the rotating transformer is mounted on the lower drum by a holding member with the fixed side facing the rotating side.

[0007]

[Function] As described above, the present invention has an upper drum formed into a cup shape with its bottom facing the lower drum, an opening provided in the side surface of the bottom of the upper drum, and the magnetic head with its tip end facing the lower drum. By protruding from the opening and attaching to the inner bottom surface of the upper drum, the rotating side of the rotating transformer is attached to the upper drum, and the fixed side of the rotating transformer is placed opposite the rotating side and attached to the lower drum using a holding member. , it is possible to create a spatial margin within the upper drum.

[0008] Furthermore, the upper drum and lower drum can be used in common for rotary transformers having different configurations, such as a flat type and a cylindrical type, without changing the design.

[0009]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIG.

In the figure, 11 is an upper drum, and 13 is a lower drum, which are made of, for example, an aluminum alloy that has relatively good corrosion resistance and good workability. The upper drum 11 is formed into a cup shape with an open top, and its bottom surface 11a faces the lower drum 13. One or more openings 14 are provided on the sides of the bottom. A magnetic head 2 is attached to the inner bottom surface 11b of the upper drum 11 by adhesive, and the tip of the magnetic head 2 protrudes from the opening 14 by approximately several micrometers.

Reference numeral 15 denotes a bearing member, which is composed of a ball bearing 16 and a shaft 17 that is fitted and fixed to the ball bearing 16. The upper end of the shaft 7 is fixed to the upper drum 11 by press fitting, and the outer surface of the ball bearing 16 It is fixed to the lower drum 13 by press fitting. Reference numeral 18 denotes an electric motor, which consists of a rotor 20 and a stator 19. The rotor 20 is attached to the upper drum 11, and the stator 19
The rotor 20 is attached to the upper drum 11, and the stator 19 is attached to the lower drum 13 to give the upper drum 11 a predetermined rotation.

Reference numeral 31 denotes a cylindrical rotary transformer, which consists of a fixed side 33 and a rotating side 32. The rotating side 32 is connected to the upper drum 11.
The fixed side 33 is disposed to face the rotating side 32 with a gap therebetween. This fixed side 33 is attached to a fixed side holder 34 on its inner peripheral surface. and,
The fixed side holder 34 is fastened to the outer peripheral surface of the lower drum 13 with screws 35.

In the tape guide drum device constructed as described above, since the magnetic head 2 is mounted on the inner bottom surface 11b of the upper drum 11 which is formed in a cup shape, there is no space above the magnetic head 2. A can be formed. This space A facilitates the configuration of the cylindrical rotary transformer 31 disposed on the inner surface of the upper drum 11, and improves space utilization efficiency, so that additional functional components such as signal processing circuits, etc. The tape guide drum device can be made smaller and lighter. Further, since the magnetic head 2 and the cylindrical rotary transformer 31 are arranged close to each other, electrical connection between the magnetic head 2 and the cylindrical rotary transformer 31 is facilitated. Furthermore, since the functional members can be inserted and assembled through the opening at the top of the cup-shaped upper drum 11, the assembly is also excellent in terms of ease of assembly.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIG. 2.

It should be noted that the same parts as those shown in the first embodiment are given the same reference numerals and their explanation will be omitted.

In the figure, the magnetic head 21 is formed of a head member 12 and a head holding member 22 that holds the head member 12. The head holding member 22 is attached to the inner bottom surface 11b of the upper drum 11 with a fastening member 37 such as a screw. It is fastened and installed. Head holding member 22 and upper drum 1
A head holding member 2 is located on the outer circumferential side in the radial direction of the fastening portion with 1.
A magnetic head position adjusting means 38 for forcibly displacing the magnetic head 2 in the axial direction B of the upper drum 11 is provided.

The magnetic head position adjusting means 38 has screw holes 40 and 40 provided in the bottom surface 11a of the upper drum 11.
It is formed by a hexagonal socket head screw 39 screwed into the hole. The hexagonal socket head screw 39 has a diameter D at the contact portion 22a between the head holding member 22 and the magnetic head position adjustment means 38, that is, the contact portion 22a between the hexagon socket head screw 39 and the magnetic head holding member 22. An adjustment hole 41 is provided which has a smaller diameter d.

The tape guide drum device constructed as described above is assembled and adjusted as follows.

The magnetic head 21 is attached to the bottom surface 11 of the upper drum 11.
After being attached to the upper drum 11 by the fastening member 37
The amount of protrusion of the magnetic head 21 from the opening 14 is adjusted to several micrometers, and the magnetic head 21 is finally mounted. Thereafter, the hexagon socket head screw 39 is rotated to advance and retreat in the direction of arrow C, thereby forcibly displacing the head holding member 22. Thereby, the position of the head member 12 is adjusted in the axial direction of the upper drum 11 as shown by arrow B.

Upper drum 1 assembled in this way
The first unit is mounted facing the lower drum 13. Then, the axial position of the head member 12 of the assembled magnetic head 21 is inspected, and if it is different from the specified position, the position of the head member 12 is adjusted again. Since the adjustment hole 41 with a diameter d is provided in the member 22, a hexagonal wrench can be inserted into the hexagonal hole 39a of the hexagonal socket head screw 39 through the adjustment hole 41, and even after assembly, the upper drum 11 can be adjusted. The axial position of the head member 12 can be readjusted from the upper opening.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIG.

It should be noted that the same parts as those shown in the second embodiment are given the same reference numerals and their explanations will be omitted.

In the figure, a magnetic head position adjusting means for forcibly displacing the head holding member 22 in the axial direction B of the upper drum 11 is provided on the radially outer peripheral side of the fastening portion between the head holding member 22 and the upper drum 11. 45 are provided.

The magnetic head adjusting means 45 is formed of a screw hole 47 provided in the head holding member 22 and a male screw 46 screwed into the screw hole 47.

In the tape guide drum device constructed as described above, the magnetic head 21 is attached to the upper drum 11 in the same manner as in the second embodiment. Thereafter, the male screw 46 is rotated to advance and retreat in the direction of arrow D, thereby forcibly displacing the head holding member 22. Thereby, the position of the head member 12 is adjusted in the axial direction of the upper drum 11 as shown by arrow B.

The unit of the upper drum 11 assembled in this way is mounted facing the lower drum 13.

Since the position of the head member 12 can be readjusted by rotating the male screw 46, the axial position of the head member 12 can be adjusted through the opening at the top of the drum 11 even after assembly. It is something that can be done.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described with reference to FIG.

It should be noted that the same parts as those shown in the first embodiment are given the same reference numerals and their explanations will be omitted.

Reference numeral 48 denotes a bearing member, which is composed of a ball bearing 49 and a shaft 50 fitted into the ball bearing 49. One end of the shaft 50 is fixed to the lower drum 13, and the other end extends into the upper drum 11. ing. The shaft 50 rotatably supports the upper drum 11 via a ball bearing 49. A fixed side holding member 52 to which the fixed side 32 of the cylindrical rotary transformer 31 is attached is fixed to the other end of the shaft 50, and the fixed side 32 is attached to the fixed side holding member 52.

With the above structure, the fixed side 32 of the cylindrical transformer 31 can be held within the upper drum 11 by the shaft 50 extending within the upper drum 11. The fixed side holding member 34 (see FIG. 1), which is inserted through the opening at the top of the upper drum 11 as shown, becomes unnecessary. Thereby, the tape guide drum device can be made smaller and lighter.

(Embodiment 5) Next, a fifth embodiment of the present invention will be described with reference to FIG.

It should be noted that the same parts as those shown in the first embodiment are given the same reference numerals and their explanation will be omitted.

Reference numeral 53 denotes a planar transformer, which is formed of a stationary side 54 and a rotating side 55 that face each other with a small gap.

The rotating side 55 is installed inside the upper drum 11 facing the magnetic head 2 mounted on the bottom surface 11a and the inner bottom surface 11b of the upper drum 11. The fixed side 54 is the rotating side 5
5 is attached to the fixed side holder 34 facing upwardly.

Reference numeral 58 indicates an electrical connection portion formed on the lower surface of the rotating side 55, and 59 indicates an electrical connection portion formed on the upper surface of the magnetic head 2. electrically connected. In addition, the elastic contactor 57
is attached to either of the electrical connection parts 58 and 59.

With the above configuration, when the rotating side 55 of the rotating transformer 53 is inserted into the upper drum 11 and installed, the electrical connection portion 58 of the rotating side 55 and the magnetic head 2 are connected.
Since the electrical connection portion 59 is electrically connected by the elastic contactor 57, the tape guide drum device can be easily assembled, and the number of assembly steps can be reduced and the configuration can be simplified.

[0038]

[Effects of the Invention] As is clear from the description of the above embodiments,
According to the present invention, a lower drum is equipped with an electric motor, an upper drum is rotatably supported by the lower drum and rotates with a magnetic tape wound thereon, and the upper drum is attached to the upper drum to record and reproduce video signals. the upper drum is formed into a cup shape with its bottom facing the lower drum, At least one opening is provided in the side surface of the bottom of the drum, the magnetic head is mounted on the inner bottom surface of the upper drum with its tip protruding from the opening, and the rotating side of the rotary transformer is installed in the upper drum. At the same time, the fixed side of the rotary transformer was mounted on the lower drum by the fixed side holding member with the fixed side facing the rotating side to form a tape guide drum device. Therefore, a space is formed in the upper drum, and a space is formed in the upper drum. Utilization efficiency is improved, and the device can be made smaller and lighter. Further, electrical connection between the magnetic head and the rotary transformer is facilitated, and furthermore, functional members can be inserted through the opening at the top of the upper drum for assembly.

As described above, according to the present invention, a circuit can be installed inside the device without changing the overall thickness of the device, and
We provide a tape guide drum device for magnetic recording and reproducing devices that is compact, lightweight, and easy to assemble, and is highly compatible with rotary transformers with different configurations, such as planar and cylindrical, without changing the design of the upper and lower drums. can do.

[Brief explanation of drawings]

FIG. 1 is a side sectional view of a first embodiment of a tape guide drum device of a magnetic recording and reproducing device of the present invention.

[Fig. 2] Side sectional view of the main parts of the second embodiment

[Fig. 3] Side sectional view of main parts of the third embodiment

[Fig. 4] Side sectional view of the fourth embodiment

[Fig. 5] Side sectional view of the fifth embodiment

[Fig. 6] Side sectional view of a tape guide drum device of a conventional magnetic recording and reproducing device.

[Explanation of symbols]

2,21 Magnetic head 11 Upper drum 12 Head member 13 Lower drum 14 Opening 17,50 axis 18 Electric motor 22 Head holding member 31 Cylindrical rotary transformer 32 Rotation side 33 Fixed side 34, 52 Fixed side holder 38, 45 Magnetic head position adjustment member 41 Adjustment hole 53 Planar rotary transformer 57 Elastic contact 58, 59 Electrical connection part

Claims (5)

[Claims] 1. A lower drum having an internal electric motor; an upper drum which is rotatably supported by the lower drum and rotates with a magnetic tape wound thereon; and an upper drum which is attached to the upper drum and records and reproduces video signals. The upper drum is provided with at least one magnetic head and at least one set of rotary transformers for transmitting video signals of the magnetic head, the upper drum is formed into a cup shape with a bottom surface facing the lower drum, and the upper drum At least one opening is provided in the side surface of the bottom of the magnetic head, and the magnetic head is mounted on the inner bottom surface of the upper drum with its tip protruding from the opening, and the rotating side of the rotary transformer is installed in the upper drum. A tape guide drum device of a magnetic recording and reproducing device, wherein the rotary transformer is mounted on the lower drum by a fixed side holder with the fixed side of the rotary transformer facing the rotating side. 2. The head holding member of a magnetic head formed of a head member and a head holding member that holds the head member is fastened to an upper drum, and the head holding member is attached to the outer peripheral side of the fastening portion in the radial direction. 2. A magnetic head position adjusting means for displacing the magnetic head in the axial direction of the upper drum, and an adjustment hole is provided in the head holding member at a contact portion between the head holding member and the magnetic head position adjusting means. tape guide drum device for magnetic recording and reproducing devices. 3. The head holding member of a magnetic head formed of a head member and a head holding member that holds the head member is fastened to an upper drum, and the head holding member is attached to the outer peripheral side of the fastening portion in the radial direction. 2. The tape guide drum device for a magnetic recording and reproducing apparatus according to claim 1, further comprising magnetic head position adjusting means for displacing the magnetic head in the axial direction of the upper drum. 4. The other end of a shaft whose one end is fixed to the lower drum and rotatably supports the upper drum is extended into the cup-shaped upper drum, and the other end of the shaft is used to hold the fixed side of the rotary transformer. 2. A tape guide drum device for a magnetic recording/reproducing apparatus according to claim 1, wherein said rotary transformer has a fixed member fixedly attached to said fixed side holding member. 5. The rotary transformer is formed of at least one set of flat plate transformers, and is installed inside the upper drum with the rotating side of the rotary transformer facing the bottom surface of the upper drum and the magnetic head. The magnetic head is mounted on a fixed side holder so as to face above the rotating side, electrical connecting portions are provided on the rotating side and the magnetic head, and the electrical connecting portions are electrically connected by elastic contacts. 2. A tape guide drum device for a magnetic recording and reproducing device according to item 1.