JP2501511Y2 - Rotating head drum device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head drum device, and more particularly to a rotary head drum device having a structure in which a fixed drum is mounted and fixed on a drum base.

2. Description of the Related Art For example, in a video tape recorder (VTR) and a digital audio tape recorder (DAT), a rotary head drum composed of a fixed drum and a rotary drum is internally provided. In addition, it is necessary to wind and attach a magnetic tape to the rotary head drum in a helical shape, so that the rotary head drum is mounted in an inclined state with respect to the main chassis. Therefore, the rotary head drum is attached to the main chassis in an inclined state by using the drum base.

FIG. 3 shows a conventional example of a rotary head drum device including a rotary head drum and a drum base. In the figure, 1 is a rotary drum, 2 is a fixed drum, 3 is a drum base, and 4 is a main chassis. Focusing particularly on the mounting structure of the fixed drum 2 and the drum base 3, the contact surface 2a of the fixed drum 2 that contacts the mounting surface 3a formed on the drum base 3 is conventionally formed on the bottom surface of the fixed drum 2. , Was selected at a position lower than the lower end of the tape running surface (the area indicated by A in the figure).

In the figure, 5 is a magnetic head, 6 is a rotary transformer, and 7 is a drum motor.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the conventional rotary head drum device described above, however, since the contact surface 2a is formed on the bottom surface of the fixed drum 2, the fixed drum 2 is positioned above the drum base 3, and the rotary drum 2 rotates. The height dimension of the head drum device becomes large, which causes a problem that the magnetic recording / reproducing device (VTR, DAT, etc.) to which the rotary head drum device is attached cannot be thinned.

Further, since the contact surface 2a is located lower than the lower end of the tape running surface A, the tape running position is inevitably located above the main chassis 4. As is well known, in order to reduce the thickness of the magnetic recording / reproducing apparatus, it is desirable that the tape running position is close to the main chassis 4, and this also causes a problem that the magnetic recording / reproducing apparatus cannot be reduced in thickness.

The present invention has been made in view of the above points, and an object of the present invention is to provide a rotary head drum device capable of reducing the thickness of the device and making the tape running position closer to the main chassis. To do.

Means for Solving the Problems In order to solve the above problems, the present invention has a drum base fixed on a chassis and an abutment surface abutting an attachment surface formed on the drum base. A rotary head drum device comprising: a fixed drum, the surface of which is mounted and fixed on a mounting surface on a drum base; and a rotary drum which supports a magnetic head and is rotatably provided on the fixed drum. It is characterized in that the contact surface is provided above the bottom surface of the fixed drum and above the lower end of the running surface of the tape wound around the fixed drum, and inside the fixed drum.

In the rotary head drum device configured as described above, the drum base mounting surface is located inside the fixed drum, and the upper part of the drum base overlaps with the fixed drum when viewed in the height direction. The rotary head drum device can be made thinner by the height of the part, and the tape running position can be brought closer to the chassis.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a rotary head drum device 8 according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of (hereinafter, simply referred to as a device).

The device 8 is roughly composed of a rotating drum 9, a fixed drum 10, and a drum base 11, and is a magnetic recording / reproducing device (VT
R, DAT, etc.) is fixed on the chassis 12.

The rotary drum 9 supports a plurality (for example, four) of magnetic heads 13 and is mounted on the fixed drum 10 in a rotatable structure. Shaft 14 that supports this rotating drum 9
Is an output shaft of a drum motor 15 disposed below the fixed drum 10, and is driven by the drum motor 15 to rotate the rotary drum 10. A printed circuit board 16 is arranged above the rotary drum 9, and a rotor core 17a of a rotary transformer 17 is arranged inside the printed circuit board 16.

The fixed drum 10 is mounted and fixed on the drum base 11, and the stator core 17b of the rotary transformer 17 is arranged at a position facing the rotor core 17a.
Bearings 18a and 18b are provided at positions facing the shaft 14. Further, the drum motor 15 described above is disposed below the fixed drum 10.

Here, paying attention to the positions where the rotary transformer 17, bearings 18a and 18b, and the drum motor 15 are disposed, both the rotary transformer 17 and the bearing 18a are disposed above the magnetic head 13, and one of the drum motor 15 is disposed. The part is structured to be housed inside the fixed drum 10. This is because the diameter of the rotary transformer 17 is small and the magnetic head 13
Because it can be arranged inside the. Therefore, the rotary transformer 17, the bearings 18a, 1 installed inside the device 8
The 8b and the drum motor 15 can be disposed at the upper position as a whole, and the rotary head drum (rotary head cylinder) including the rotary drum 9 and the fixed drum 10 can be thinned.

The drum base 11 is fixed on the chassis 2 and
The fixed drum 10 is placed and fixed on the upper part thereof. The rotary head drum needs to be attached to the chassis 12 at an angle in order to allow the magnetic tape to travel helically, and a drum base 11 is provided for this purpose.

Next, the contact surface 10a, which is the main part of the present invention, will be described. The contact surface 10a is formed on the lower portion of the fixed drum 10 and is a portion that contacts the mounting surface 11a formed on the drum base 11. The contact surface 10a is placed on the mounting surface 11a, and is fixed by, for example, a screw 19 to fix the fixed drum 10
Is mounted on the drum base 11. The contact surface 10a is formed at a position higher than the bottom surface 10b of the fixed drum 10 and higher than the lower end of the tape running surface, and is located inside the fixed drum 10.

With the above configuration, a part of the upper portion of the drum base 11 enters the fixed drum 10 and is in a housed state. Therefore, the device 8 can be thinned by the dimension of the portion where the drum base 11 overlaps with the fixed drum 10 in the height direction (indicated by the arrow L in the drawing). Also, because the upper part of the drum base 11 enters the inside of the fixed drum 10,
It is possible to set the lower end of the tape running surface (the area indicated by A in the figure) lower than the contact surface 10a and in a position very close to the bottom surface 10b, and the tape running position can be brought close to the chassis 12 The magnetic recording / reproducing device to which 8 is attached can be further thinned.

FIG. 2 is a rotary head drum device which is a modified example of the present invention.
20 (hereinafter, simply referred to as a device). The device 20 shown in the figure is a small-diameter drum (for DAT, for example), and it is difficult to further reduce the diameter of the rotary transformer 21. Therefore, the rotary transformer 21, bearings 22a, 22b
The drum motor 23 and the drum motor 23 are arranged at the same positions as in the conventional case. In this device 20, an annular recess is formed on the bottom surface of the fixed drum 24, and this recess serves as the contact surface 24a. Therefore, the contact surface 24a with which the drum base 25 (shown by the alternate long and short dash line in the figure) contacts is located at a position higher than the bottom surface 24b of the fixed drum 24. The traveling position can be brought closer to the chassis 12.

The diameter of the drum base does not necessarily have to be smaller than the diameter of the fixed drum. As shown in FIG. 2, if the position is outside the tape traveling range A, the diameter of the drum is larger than that of the fixed drum 24. Also good as base 25. However, in this case, although the device can be made thinner than the conventional device, the tape traveling position is limited by the drum base 25, and therefore the device 8 shown in FIG. 1 is a desirable configuration for making the device thinner.

As described above, according to the present invention, the contact surface is provided above the bottom surface of the fixed drum and above the lower end of the running surface of the tape wound around the fixed drum and inside the fixed drum. As a result, a part of the upper part of the drum base is in a state of being housed in the fixed drum, so that it is possible to reduce the thickness of the device by a size in which the fixed drum and the drum base overlap each other when viewed in the height direction. Moreover, since the lower end of the tape running surface can be located at a position lower than the contact surface of the fixed drum and very close to the bottom surface of the fixed drum, the running position of the tape can be brought close to the chassis, and the magnetic device can be attached. It has features such that the recording / reproducing device can be made thinner.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an apparatus according to an embodiment of the present invention,
FIG. 1 is a vertical sectional view of a device which is a modification of the device shown in FIG.
FIG. 3 is a diagram showing an example of a conventional device. 8,20 …… Rotary head drum device, 9 …… Rotary drum, 1
0,24 …… Fixed drum, 11,25 …… Drum base, 12 ……
Chassis, 13 ... magnetic head, 15,23 ... drum motor, 17,21 ... rotary transformer, 10a, 24a ... contact surface,
10b, 24b …… Bottom surface, 11a, 25a …… Mounting surface.

Claims (1)

(57) [Scope of utility model registration request] 1. A drum base fixed on a chassis, and a contact surface for contacting a mounting surface formed on the drum base, the contact surface being mounted and fixed on the mounting surface. In a rotary head drum device comprising a fixed drum mounted on a drum base and a rotary drum supporting a magnetic head and rotatably provided on the fixed drum, the contact surface is located above the bottom surface of the fixed drum. And a rotary head drum device provided at a position above the lower end of the running surface of the tape wound around the fixed drum and inside the fixed drum.