JPH0561809U - Rotating magnetic head device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent misalignment and tightening distortion during rotation of the rotating drum. [Structure] A rotary drum 16 is press-fitted and fixed directly to a rotary shaft 4 rotatably supported by a bearing 3 held by a fixed drum 2, and directly attached. Further, the disk 20 is press-fitted and fixed directly to the rotary shaft 4, and the head base 8 is mounted to the flange 20a of the disk 20 to fix the magnetic head 9 to the tip.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary magnetic head device applied to a VTR, DAT or the like.

[0002]

[Prior Art]

 As for the rotary magnetic head device applied to a small VTR, DAT, etc., naturally, a small one is desired. A structure shown in Japanese Utility Model Laid-Open No. 1-166313 is known as a rotary magnetic head device for this purpose.

FIG. 2 is a cross-sectional view showing the structure thereof, in which a bearing 3 held by a fixed drum 2 is rotatably supported by a rotating shaft 4. A stationary stator transformer 5 is attached to the upper surface of the stationary drum 2. A sleeve 7 is fixed to the upper part of the rotary shaft 4, a head base 8 is attached to the upper surface of a flange 7a of the sleeve 7 with a screw 6, and a magnetic head 9 is fixed to the tip of the head base 8. ..

A rotary-side rotary transformer 12 is attached to the lower surface of the flange 7a via a printed circuit board 11, and the rotary-side rotary transformer 12 faces the fixed-side stator transformer 5 with a slight gap.

The sleeve 7 is tightened by providing a ring 14 around the sleeve 7, and a rotary drum 16 is attached to the flange 7 a by a screw 15. The rotating drum 16 is provided with a hole 16a, and the adjusting screw 17 is screwed into the hole 16a, whereby the head base 8 is pressed and the inclination of the magnetic head 9 with respect to the rotating shaft 4 is adjusted. .. Reference numeral 18 is a thrust bearing, and 19 is a base.

[0006]

[Problems to be solved by the device]

 By the way, in the conventional rotary magnetic head device, the rotary drum 16 is fixed to the rotary shaft 4 via the screw 7 on the flange 7a of the sleeve 7, so that misalignment is likely to occur when the rotary drum 16 rotates. There is a problem. Further, since the rotary drum 16 is attached to the sleeve 7 by the screw 15, there is a problem that the sleeve 7 is tightened and distorted.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a rotary magnetic head device capable of preventing misalignment and tightening distortion of a rotary drum. is there.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention relates to a rotary magnetic head device in which a rotary drum is attached to a rotary shaft rotatably supported by a bearing held by a fixed drum. The present invention is characterized by including a transformer holding member, a head base fixed to the rotary side rotary transformer holding member and having a magnetic head fixed to the tip thereof, and a rotary drum fixed to the rotary shaft.

[0009]

[Action]

 Since the rotary drum is press-fitted and fixed and directly attached to the rotary shaft, there is almost no misalignment during rotation of the rotary drum. Also, since no sleeve is used, tightening distortion does not occur.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the rotary magnetic head device of the present invention. Reference numeral 2 is a rotating drum, and a rotating shaft 4 is rotatably supported by a bearing 3 which is an integral bearing held by the rotating drum. A fixed-side stator transformer 5 is attached to the upper surface of the fixed drum 2.

A disk 20 is press-fitted and fixed to the center of the rotary shaft 4, and a head base 8 is attached by screws 6 to the upper surface of a flange 20 a of the disk 20. A magnetic head 9 is fixed to the tip of the head base 8. A rotary side rotary transformer 12 is attached to the lower surface of the flange 20a via a printed circuit board 11, and the rotary side rotary transformer 12 faces the fixed side stator transformer 5 with a slight gap.

A rotary drum 16 is press-fitted and fixed to the upper portion of the rotary shaft 4. The rotary drum 16 is provided with a hole 16a, and the adjusting screw 17 is screwed into the hole 16a, whereby the head base 8 is pressed and the inclination of the magnetic head 9 with respect to the rotating shaft 4 is adjusted. ing. The rotary shaft 4 is connected to a motor 21, and the rotary drum 16 is rotated by the motor 21.

A lead wire (not shown) is drawn out from the fixed-side stator transformer 5 attached to the fixed drum 2 and connected to an external signal processing circuit. A lead wire (not shown) drawn from the magnetic head 9 is connected to the rotary rotary transformer 12 on the printed circuit board 11. When the rotating drum 16 is rotating, the rotary transformer 12 on the rotating side and the stator transformer 5 on the stationary side are magnetically coupled, and a signal is transmitted from an external signal processing circuit to the magnetic head 9, or a signal from the magnetic head 9 is an external signal. It is transmitted to the processing circuit.

According to the rotary magnetic head device having the structure of the present embodiment as described above, the magnetic drum 16 and the disk 20 serving as the rotary side rotary transformer holding member are simultaneously rotated by the rotation of the rotary shaft 4, but the magnetic drum 16 is rotated. Is fixed by press fitting and directly attached to the rotating shaft 4, and is not attached via the sleeve 7 as in the conventional case, so that misalignment hardly occurs during rotation. Further, since the sleeve 7 is not used, tightening distortion due to the sleeve does not occur.

[0015]

[Effect of the device]

 As described above, according to the present invention, since the rotary drum is directly attached to the rotary shaft by press-fitting and fixing without using the sleeve, misalignment during rotation of the rotary drum can be prevented or reduced. Furthermore, it is possible to prevent the occurrence of tightening distortion due to the sleeve.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a rotary magnetic head device of the present invention.

FIG. 2 is a cross-sectional view showing a conventional rotary magnetic head device.

[Explanation of symbols]

 2 fixed drum 3 bearing 4 rotating shaft 5 fixed side stator transformer 8 head base 9 magnetic head 11 printed circuit board 12 rotating side rotary transformer 16 rotating drum 20 disk 20a flange

Claims (1)

[Scope of utility model registration request] 1. A rotary magnetic head device in which a rotary drum is attached to a rotary shaft rotatably supported by a bearing held on a fixed drum, and a rotary side rotary transformer holding member fixed to the rotary shaft, A rotary magnetic head device comprising: a head base attached to a rotary-side rotary transformer holding member and having a magnetic head fixed to a tip thereof; and a rotary drum fixed to the rotary shaft.