JPH0629763Y2 - Rotating head cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a rotary head cylinder such as a VTR or R-DAT.

(B) Conventional Technology Conventionally, for example, a rotary head cylinder of a VTR is composed of a fixed cylinder and a rotary cylinder rotatably supported by the fixed cylinder via a rotary shaft. A rotary transformer rotor that constitutes a rotary transformer for transmission and reception is arranged on the rotary cylinder side, and a rotary transformer stator is arranged on the fixed cylinder side. Then, the winding end portion of the rotary transformer stator arranged on the fixed cylinder side is connected to a relay printed circuit board fixed on the fixed cylinder side, and signals are taken out through the relay printed circuit board. Here, as a method of fixing the relay printed circuit board to the fixed cylinder, as shown in FIG. 5, after once attaching the support member (3) to the lower surface of the fixed cylinder (2) on which the rotary transformer stator (1) is arranged, The relay printed circuit board (4) may be mounted on the support member (3), or the annular relay printed circuit board (4) may be directly mounted on the lower surface of the fixed cylinder (2) as shown in FIG. Alternatively, as shown in FIG. 7, the relay relay printed circuit board (4) is bonded and fixed to the rotary transformer stator (1) in advance, and the rotary transformer stator (1) is bonded and fixed to the fixed cylinder (2) for relaying. Fixed cylinder with printed circuit board (4)
Some have been designed to be attached to (2). Here, (5) is a winding end of the rotary transformer stator (1), and (6) is a lead wire connected to the head amplifier side. As a method of mounting such a relay printed circuit board, Japanese Patent Publication No. Sho 61-37681
There is also one such as Japanese Patent Publication (G11B5 / 02).

(C) Problems to be solved by the invention However, in the conventional mounting method, first, in the case of FIG. 5, the number of parts and the number of assembling steps increase due to the need for the additional supporting member (3), In the case of Fig. 6, a space for soldering the lead wire (6) to the relay printed circuit board (4) is required on the lower surface side of the fixed cylinder (2), and the installation space of the motor originally mounted at this position is reduced. However, there is a problem that the motor performance is hindered. Further, in the case of FIG. 7, it is necessary to make a large notch in the outer peripheral portion of the fixed cylinder (2), so that the strength of the fixed cylinder (2) is reduced and it becomes difficult to perform high-precision machining. Further, in such a rotary head cylinder, oscillation of a head amplifier (not shown) connected to the relay printed circuit board (4) via the lead wire (6),
In order to eliminate noise, it is necessary to ground the fixed cylinder (2) and the head amplifier. In FIG. 7, the ground lead wire (6) from the head amplifier is connected to the ground conductive pattern (7) of the relay printed circuit board (4). ), The conductive pattern (7) for grounding and the fixed cylinder (2) are connected to the fixed cylinder (2) so that the head of the screw (8) contacts the conductive pattern (7) for grounding. It was carried out by screwing on (the same applies to those in FIGS. 5 and 6).

(D) Means for Solving the Problems In order to solve the above problems, the present invention provides a rotary head including a fixed cylinder and a rotary cylinder rotatably supported by the fixed cylinder via a rotary shaft. In the cylinder, a mounting recess is formed by cutting out the vicinity of the side wall portion of the lower surface of the fixed cylinder, and one end side of the relay printed board is mounted in the mounting recess and the other end side is projected from the side wall portion of the fixed cylinder, On the upper surface of the protruding other end side, a signal conductive pattern to which the other end of the winding of the rotary transformer stator arranged in the fixed cylinder is connected is formed.

(E) Action In the rotary head cylinder of the present invention having the above-mentioned configuration, the relay printed circuit board can be arranged without increasing the number of parts, reducing the strength of the fixed cylinder, reducing the motor installation space, etc. Can be promoted.

(F) Embodiment One embodiment of the present invention will be described below with reference to the drawings.
It should be noted that the same parts as those of the related art are designated by the same reference numerals and the description thereof is omitted.

That is, according to the present invention, a mounting recess (9) is formed by cutting out the vicinity of the lower wall of the fixed cylinder (2), and the relay printed circuit board (4 ') is formed in the mounting recess (9). Screw on one end (10)
And the other end side is projected from the side wall of the fixed cylinder (2), and the winding end of the rotary transformer stator (1) arranged on the fixed cylinder (2) is provided on the upper surface of the protruding other end side. A signal conductive pattern (11) to which the portion (5) is connected is formed. Further, a grounding conductive pattern (11 ') is formed together with the signal conductive pattern (11) on the upper surface of the relay printed circuit board (4'), and the grounding conductive pattern (11 ') is attached when the relay printed circuit board (4') is mounted. Pattern (11 ')
Attach the cylinder to the bottom (9a) of the mounting recess (9).
It is designed to be electrically connected to (2).

Therefore, in the rotary head cylinder of the present invention having such a configuration,
The relay printed circuit board (4 ') does not project to the lower surface side of the fixed cylinder (2), and the appearance is the same as that attached to the side wall of the fixed cylinder (2). The position is regulated by the side surfaces (9a) (9c) (9d) of the place (9), so that it is stable. Incidentally, (12) is an insertion hole for taking out the winding end portion (5) of the rotary transformer stator (1),
Reference numeral (13) is a rotating shaft rotatably supported by the bearing (14).

(G) Effect of the Invention As described above, according to the rotary head cylinder of the present invention, the relay printed circuit board is installed without protruding to the lower surface side of the fixed cylinder, and the appearance is the same as that of the side wall of the fixed cylinder. At the same time, since the soldering process for the lead wire from the head amplifier and the soldering process for the winding end part from the rotary transformer stator is performed on the upper surface side of the relay printed circuit board, the motor mounted on the lower surface side of the fixed cylinder. The installation space is not reduced. Further, since the strength of the fixed cylinder can be properly maintained, it is extremely useful especially for promoting miniaturization of the rotary head cylinder.

[Brief description of drawings]

1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is an exploded perspective view thereof, FIG. 4 is a view showing a relay printed circuit board, FIG. 5, FIG. FIG. 7 and FIG. 7 are views showing different conventional examples. (1) …… Rotary transformer stator, (2) …… Fixed cylinder, (4 ′) …… Relay printed circuit board, (9) …… Mounting recess.

Claims (1)

[Scope of utility model registration request] 1. A rotary head cylinder comprising a fixed cylinder and a rotary cylinder rotatably supported by the fixed cylinder via a rotary shaft, wherein a mounting recess is formed by notching a side wall portion of a lower surface of the fixed cylinder. Then
One end side of the relay printed circuit board is mounted in this mounting recess and the other end side is projected from the side wall portion of the fixed cylinder, and the winding of the rotary transformer stator disposed on the fixed cylinder is provided on the upper surface of the projected other end side. A rotary head cylinder, characterized in that a conductive pattern for a signal to which an end portion is connected is formed, and a conductive pattern for a ground, which is brought into pressure contact with the fixed cylinder to be in an electrically connected state, is formed on a relay printed circuit board.