JP2793022B2 - Rotary head drum tape guide device - Google Patents

Description

The present invention relates to a rotary head drum tape guide device used in a magnetic recording / reproducing device capable of performing simultaneous monitor reproduction at the time of recording in a VTR, DAT, or the like.

(B) Conventional technology In recent years, with miniaturization of magnetic recording / reproducing devices such as VTRs and DATs or multiplication of magnetic heads, importance has been placed on crosstalk between channels of a rotary transformer. On the other hand, the need for simultaneous monitoring (recording and reproducing at the same time) has arisen in VTR and DAT data recorders.

FIG. 2 shows a conventional example of a cylinder for an 8 mm VTR. In the figure, reference numeral (31) denotes a rotary cylinder to which a magnetic head (32) is attached and a rotary shaft (33) is screwed and fixed to a press-fitted disk (34). (3
5) is a fixed cylinder, in which a pair of upper and lower bearings (36), (37) and a bearing with a shaft composed of a preload spring (38) and the rotating shaft (33) are attached to the bearing housing to rotate the bearing. The cylinder (31) is rotatable.

(39) is a rotary rotary transformer fixed to a disk (34), (40) is a fixed rotary transformer fixed to a fixed cylinder (35), and (41) is a motor housing mounted on the rotary shaft (33). Be worn.

In this case, the winding for recording and the winding for reproduction are arranged on the same rotary transformer, and the rotary transformer itself is enlarged.

Further, as shown in FIG. 3, there is another type in which separate rotary transformers (43) and (44) are further disposed on the upper surface of the rotary cylinder (31) via a spacer (42). In this case, a column (45), a mounting plate (46), a spacer (47), etc. are required to attach the additional rotary transformers (43) and (44), and the method of supporting the rotary transformer is unstable. In addition, there is a disadvantage that the device itself becomes large.
For example, JP-A-60-117401 (G11B 5/02) No. 1
See FIG. 2 and FIG.

(C) Problems to be Solved by the Invention As described above, in the case where the rotary transformer is arranged at two locations corresponding to the multi-channel, the method of fixing the rotary transformer becomes unstable.

When the cylinder is reduced in size and the mechanism itself is reduced, it is difficult to fix a column or the like around the cylinder.

Adjustment of the gap of the rotary transformer becomes complicated.

There is a problem.

(D) Means for Solving the Problems In order to solve the above-mentioned problems, a rotary head drum tape guide device of the present invention includes a rotary head drum having a rotary magnetic head and a bearing housing, and has a tape guide surface on the outer periphery. In the conventional structure in which a first rotary transformer for signal transmission is disposed between cylinder tape guides having the same structure, a driven shaft press-fitted into the rotary head drum is lengthened to protrude from the upper surface of the rotary head drum. One of the second rotary transformers is disposed on the upper surface of the drum via a spacer, and a pair of second bearings attached to a holder are fixed to the protruding portion of the driven shaft, and the second rotary transformer is fixed to the holder. A configuration is adopted in which the other rotary transformer is disposed to face the second rotary transformer.

(E) Action The holder is rotatably attached to the driven shaft fixed to the rotary head drum via the second bearing via the second bearing, and the second rotary transformer is fixed to the holder. Can be installed stably. Further, since one of the second rotary transformers is mounted via the spacer, the gap of the rotary transformer can be easily adjusted by changing the thickness of the spacer.

(F) Embodiment A rotary head drum tape guide device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross-sectional view of the present invention.
(1) is a cylinder tape guide (hereinafter referred to as a lower cylinder) having a bearing housing portion (1a) at the center and a tape guide surface (1b) at the outer periphery.

(2) a disk (3) is fixed substantially at the center of the driven shaft, and a pair of bearings (4) and (5) are attached by holding a preload spring (6); Is held rotatably.

(7) is a rotary head drum (hereinafter referred to as an upper cylinder) in which a plurality of magnetic heads (8) are screwed and fixed to the disk (3). (9) and (1
Reference numeral 0) denotes a pair of first rotary transformers which are fixed to the lower cylinder (1) and the disk (3), respectively. (1
1) is a spacer which is fixed to the upper surface of the upper cylinder (7) and rotates together with the upper cylinder (7). (12),
(13) is a holder (14) attached to the driven shaft (2).
Are preloaded by a pair of second bearings held by the preload boss (15).

(16) and (17) are second rotary transformers which are fixed to the spacer (11) and the holder (14), respectively, and transmit signals. (18) is a lead wire for electrically connecting the magnetic head (8) and the winding of the rotary transformer (16), and (19) is a lead connected from the winding of the rotary transformer (17) to a predetermined signal path. Numerals (20) indicating the respective lines are lead wires for transmitting signals from the windings of the first rotary transformer (9).

A motor housing (21) is attached to the lower cylinder (1) and drives the driven shaft (2) to rotate, but the details are omitted.

In the above-described configuration, the rotary transformer is divided into two parts, and the second rotary transformer (17) is connected to the lead wire (1).
9) By electrically connecting the rotary transformer (17) and the holder (14) to a predetermined location on the chassis (not shown) side, the rotary transformer (17) and the holder (14) are temporarily fixed. Load fluctuation due to the co-rotation of the holder (14) is prevented.

By dividing the rotary transformer into two parts, it is possible to sufficiently cope with a multi-channel magnetic head. In order to reduce interference and crosstalk, for example, a video signal is sent to the first rotary transformer, and an audio signal is sent to the second rotary transformer. It can be arranged separately on the rotary transformer side. Alternatively, they may be separately provided for power transmission and signal transmission.

(G) Effects of the Invention Since the present invention is configured as described above, the following effects can be obtained.

The driven shaft is protruded from the upper cylinder upper surface, a pair of bearings is attached to the protruding portion, and the pair of bearings is held by the holder, and the rotary transformer is fixed to the holder. Installation is stable.

Since one of the second rotary transformers is fixed to the upper surface of the upper cylinder via the spacer, the gap between the rotary transformers can be easily adjusted.

One of the rotary transformers is temporarily fixed by electrically connecting the winding of the second rotary transformer to a predetermined portion of the printed circuit board fixed to the chassis or the like by a lead wire. Signal transmission corresponding to a multi-head configuration can be performed without adversely affecting load fluctuation at the time.

Further, the cylinder structure can be reduced in size and space.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is a sectional view of a conventional example, and FIG. 3 is a side view of another conventional example. (1) Cylinder tape guide, (2) Driven shaft, (4), (5) Bearing, (7) Rotating head drum, (9), (10) Rotary transformer , (11)…
... Spacer, (12), (13) ... Bearing, (14) ... Holder, (16), (17) ... Rotary transformer, (18),
(19) ... Lead wire.

Claims (2)

(57) [Claims] 1. A rotating head drum having a rotating magnetic head and a driven shaft protruding and fixed vertically, and a bearing housing having a pair of upper and lower first bearings for supporting the driven shaft are provided on the outer periphery. A rotary tape drum guiding device having a pair of first rotary transformers disposed between the cylindrical tape guide and the rotary head drum, wherein a spacer is provided on an upper surface of the rotary head drum; One of the second rotary transformers is disposed via the first shaft, and a pair of second bearings is mounted on the drive shaft via a holder, and the second shaft is mounted on the holder so as to face one of the second rotary transformers. A rotary head drum tape guiding device, wherein the other of the two rotary transformers is provided. 2. The electrical connection between the rotary magnetic head and one winding of the second rotary transformer, and the other winding of the second rotary transformer is electrically connected to a predetermined fixed point. 2. A rotary head drum tape guiding device according to claim 1, wherein said rotating head drum tape guiding device is connected.