JPH01251301A - Drum assembling body - Google Patents

Abstract

PURPOSE:To decrease the assembling man-hour by connecting one end of a head coil electrically with one end of the coil of a rotary transformer by using a rotary drum body. CONSTITUTION:The end of the head coil soldered on a head base 401 is electrically connected with a supporting body 14 through the head base 401 and a rotary drum 12, and the supporting body 14 is soldered on a pattern 248 formed on a wiring printed board 24 of the rotary transformer through a terminal plate 249. Since the rotary drum body formed out of conductive material is used as means to connect the end of the head coil with the end of the coil of the rotary transformer, soldering places are decreased to 9 places in total. In a general rotary head assembling body with 2 head chips 403, soldering is executed in 17 places and 7 places are decreased in comparison with conventional 24 places. Thus, the soldering connection places at the time of assembling can be decreased and the assembling man-hour can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to rotating head drum assemblies for video cheap lay coaters and the like.

In the prior art, for example, a rotary head drum assembly of a video cheap recorder was generally constructed as shown in FIG. This rotating head drum assembly includes a lower drum 10 fixed on a base, a drive motor 11 attached to the lower side of the lower drum 10, and a drive motor 11 attached rotatably to the upper side of the lower drum 10. , and a rotating drum 12 rotated by a drive motor 11.

A shaft 13 of a drive motor 11 is rotatably supported at the center of the lower drum 10. The shaft 13 projects above the lower drum 10 and has a circular support 14.
are fitted and supported. The support body 14 consists of a flange 141 and a tip 142, and the tip 142 is connected to the flange 141.
It has a smaller diameter. An opening 12 is provided in the center of the rotating drum 12.
1 is formed, and the shaft 13 and the tip end 142 of the support body 14 pass through this opening 121. The rotating drum 12 and the support body 14 constitute a rotating drum body. The rotating drum 12 is received by a flange 141 and has screw holes 122,1.
It is screwed and fixed to the support body 14 by a screw 144 that is screwed into the screw 43 .

A recess is formed on the upper surface of the rotating drum 12, and a printed circuit board 15 is attached thereto. Insertion holes 154, 155, 156, and 157 are formed in the solder land portions at both ends of the patterns 152 and 153 formed on the printed circuit board 15. The rotation and ram 12 corresponding to the insertion holes 154 to 157 have through holes penetrating through the lower surface thereof.

The upper part of the lower drum 10 is in the shape of a hollow cylindrical drum that is open upward, and a stator 22 of a rotary transformer is assembled and arranged in the inner space 21 of this drum body 20. A rotor 23 of a rotary transformer is disposed above the stator 22 and assembled to the lower surface of the support 14 . Coils (not shown) are mounted concentrically on the opposing surfaces of the stator 22 and rotor 23, respectively, and rotate while maintaining a constant gap. These coils are provided according to the number of video heads 40 to be described later, and in the illustrated example, there are two (two channels). A printed circuit board 24 is mounted on the upper surface of the rotor 23.
are arranged, and the printed circuit board 24 and the coil on the rotor 23 side are connected by a pair of coil terminal portions 25.2B.

A frame 30 fitted to the support body 14 is arranged above the printed circuit board 24. A terminal transformer 3L31 is integrally attached to the frame 30. The terminal transformer 31 stands vertically, and its upper end portion is inserted into the through hole of the rotating drum 12. The terminal transformer 31 is made of an insulating material such as synthetic resin, has a pair of conductors 32 and 33 inside, and has both ends protruding.

A conductor 32 protrudes downward from the terminal transformer 31.
33 is soldered to one end of the patterns 241 and 242 of the printed circuit board 24. On the other hand, terminal transformer 3
Conductors 32 and 33 protruding upward from 1 are inserted into insertion holes 156 and 157 of the printed circuit board 15 and soldered.

A plurality of video heads, which will be described later, are mounted on the lower surface of the rotating drum 12. The video head is printed circuit board 1
5 and is electrically connected to the terminal transformer 31.
Signals are transmitted to rotary transformers 23 and 22 via. The stator 22 of the rotary transformer is connected to a connection cable (
(not shown) are connected. A video circuit formed on the circuit board is connected to this connection cable.

Rotating drum 1 according to FIGS. 9, 10 and 11
2 is shown in detail, and a plurality of video heads 40140 . . . are attached to the lower surface of the rotating drum 12. The video head 40, 40... has a head chip located in a gap formed between the lower drum 10 and the rotating drum 12, and slightly protrudes from the gap to the drum circumferential surface to come into sliding contact with the magnetic tape. It has become. A helad base 401 is integrally attached to the head chip 400. A printed board 402 is attached to the head base 401. The head base 401.401 is fixed to the lower surface of the rotating head 12 with screws.

Both ends of the head coil 403 wound around the head chip 400 are connected by soldering to one ends 406 and 407 of patterns 404 and 405 provided on the printed board of the head base. The other ends 408, 409 of the patterns 404, 405 are soldered to one end of the head terminals 411, 412. The other end of the head terminal 41L412 is inserted into the insertion hole 154.155 of the pattern 152.153 on the printed circuit board 15 of the rotating drum 12 and soldered to the slotted ground portion. The conductor 32. of the terminal transformer is inserted into the insertion hole 156.157 at the other end of the pattern 152.153.
The upper end of No. 33 is inserted, and the solder connection is made at the No. 1 gland.

The lower ends of the conductors 32, 33 of the terminal transformer 31 are soldered to solder lands 243, 244 formed at one end of the pattern 241, 242 of the printed circuit board 24 attached to the rotor 23 of the rotary transformer. The other ends of the patterns 241 and 242 are soldered to connect coils (not shown) glued 25 and 26 provided on the other surface of the rotor 23.

An electrical circuit diagram showing the connection between the video head 40 and the rotary transformers 23, 22 of this prior art is shown in FIG.

Problems to be Solved by the Invention As described above, both ends of the coil 403 of one conventional head are soldered to one end 406, 407 of the pair of patterns 404, 405 of the printed board 402 of the head base (
2 places), the other end 408 of a pair of patterns 404 and 405
．． At 409, one end of the head terminal 41L412 is soldered (in two places), and the other end of the head terminal 411.412 is connected to the pattern 152.153 of the printed circuit board 15 of the rotating drum.
The insertion holes 154 and 155 are soldered (2 places),
Insertion hole 156.157 at the other end of pattern 152.153
The upper end of the conductor 32 of the terminal transformer 31 is soldered (in two places), and the lower end of the conductor 32 of the terminal transformer 31 and the printed circuit board 2 of the rotor 23 of the rotary transformer are soldered.
It is soldered to one end of pattern 241 and 242 of 4 (2
The other end of the rotor pattern 24L 242 is soldered to both ends of the coil of the rotor 23 (at two locations). In this case, a total of 12 locations are soldered. In a general rotary head drum assembly with two head chips 400, two
It will be soldered in 4 places.

According to the conventional connection method, there are many places to solder, and the number of patterns and terminals increases proportionally.
There are problems in that the number of assembly steps increases, the shape of the parts becomes complicated, the cost increases, and the reliability decreases.

Means for Solving the Problems In the present invention, in order to solve the above-mentioned conventional problems, one end of the head coil is formed of a conductive material such as metal. A rotating drum body was used to electrically connect one end of the coil of a rotary transformer.

The rotating drum body has a head on the outer periphery and is composed of an outer rotating drum made of a conductive material, and an inner support member made of a conductive material and connecting the rotating drum to a rotation center shaft. be done.

The other end of the head coil is electrically connected to the other end of the coil of the rotary transformer rotor using a conductive member coated with an insulating material and fixed to the rotating drum body.

A rotating drum body formed of a working electrically conductive material is utilized as a means for connecting one end of the head coil and one end of the coil of the rotary transrotor.

Since both the head and the rotary transformer are attached to the rotating drum body, if the rotating drum body can be used as a means to connect the head and the rotary transformer, it will be the shortest distance and the number of soldering points can be reduced. becomes.

Embodiment FIG. 1 is a perspective view showing a rotary drum assembly according to an embodiment of the present invention, with the rotary drum separated.

2 shows a top view of the rotating drum shown in FIG. 1, FIG. 3 shows a half-sectional side view of the rotating drum shown in FIG. 2, and FIG. 4 shows a bottom view of the rotating drum shown in FIG. Fifth
The figure is an enlarged plan view of the head used in Figure 3.4.
FIG. 6 shows a top view of the rotor of the rotary transformer used in FIG. 1.

FIG. 7 shows a circuit diagram of the head and rotary transformer of FIG. 1.

1 to 7 correspond to FIGS. 8 to 14 showing the conventional example, and in FIGS. 1 to 7, the same parts as in FIGS. 8 to 14 have the same reference numerals. , and the explanation will be omitted.

To explain the new point, the pattern formed on the top surface of the printed circuit board 24 attached to the top surface of the rotor 23 of the rotary transformer is pattern 242 and pattern 24.
It consists of 8. If the rotary transformer has two 2-channel coils as in the illustrated example, the pattern 248 is 2 channels.
One end of the coil of each channel is connected to each other.

That is, one end 245 of the rotary transformer coil concentrically wound around the lower surface of the rotor 23 is soldered to one end of the pattern 242, and the other end 246 is connected to the pattern 248. Therefore, when there are multiple coils, the pattern 248 commonly connects the other ends 246 and 246 of each coil. This pattern 248 is connected via a terminal plate 249 to the lower part of the support 14 closest to the rotor 23 out of the rotating drum 12 and the support 14 that constitute the rotating drum body. It is conceivable that the terminal plate 249 is formed on the support body 14 by screwing or the like. It is also conceivable to use a lead wire instead of the terminal plate 249, or to provide a land and directly solder it.

This terminal plate 249 is electrically connected to the pattern 248 by soldering or contacting the pattern 248.

The terminal transformer 3L31 corresponds to the head 40.40 and is formed using an insulating material on the support 14 and is attached thereto, as in the conventional case, but only one conductor 32 is inserted therein. It is new. The lower end of this conductor 32 is connected to the pattern 2 of the rotor's printed circuit board 24.
42 is connected to the other end 244 by soldering.

The upper end of the conductor 32 of the terminal transformer 3L31 is inserted into an insertion hole 156.15.8 formed at one end of the pattern 152 of the printed circuit board 15 attached to the rotating drum 12 and soldered.

The pattern 152 formed on the printed circuit board 15 of the rotating drum 12 is formed corresponding to the head 40140 as in the conventional case, but the pattern 152 is formed corresponding to the head 40140, but the pattern 152 is formed corresponding to the head 40140.
It is novel that there is only one conductor 32 in each of the conductors 32. Therefore, the pattern 152 corresponds to each head 40.
．． One pattern 152 is formed, and since there are two heads in the illustrated example, there are two patterns 152.

The tip 1 of the support 14 is inserted into the center opening 121 of the rotating drum 12.
42 are fitted, and when the rotating drum 12 and the support body 14 are closely fixed with the screws 144, the upper end of the conductor 32 of the terminal transformer 31.31 is inserted into the insertion hole 15E3.158 of the printed circuit board 15, One end of the pattern 152 is soldered on the top surface of the printed circuit board 15.

Insertion hole 15 formed at the other end of pattern 152.152
4.154, one end of the head terminal 411 is inserted and soldered as in the conventional case, but one end of this head terminal 4LL411 corresponds to each head 40.40. This is new.

The other end of the head terminal 411 is connected to the printed circuit board 5 of the head 40.
It is soldered to one end 408 of the pattern 404 formed in 02. Pattern 4 formed on printed circuit board 502
It is new that 04 is also one piece.

The other end 406 of the pattern 404 is connected to one end of the head coil 403 wound around the head chip 400 with soldering.

The other end of the head coil 403 is connected to the base 401 of the head 40
The soldering is new to the connection.

The head base 401 is fixed to the lower surface of the rotating drum 12 with screws, and is mechanically and electrically connected and fixed to the rotating drum 12.

In this way, one end of the coil 403 of the head 40 is soldered to one end 406 of the pattern 404 of the printed circuit board 502, and the other end is soldered to the head base 401 (in two places).Soldering to the head base 401 is as follows. If it is difficult to solder directly to the head base 401, a terminal plate may be attached to the head base 401 and soldered to the terminal plate. The other end 408 of the pattern 404 is soldered to one end of the head terminal 411, and the other end of the head terminal 411 is inserted into the insertion hole 154 of the printed circuit board 15 of the rotating drum and soldered to one end of the pattern 152 ( 2
location). The other end of pattern 152 is terminal transformer 3
1 conductor 32 is inserted and soldered, conductor 3
The lower end of 2 is soldered to one end 244 of a pattern 242 formed on the printed circuit board 24 of the rotor (at two locations).

At the other end of the pattern 242 is one end 2 of the coil of the rotor 23.
45 is soldered to the other end 246 of the coil of the rotor 23.
are soldered to one end of the pattern 248 (at two locations).

Head coil 40 soldered to head base 401
The other end of 3 is electrically connected to the support 14 via the head base 401 and the rotating drum 12, and the support 14 is soldered to a pattern 248 formed on the printed circuit board 24 of the rotary transformer via a terminal plate 249. be done (1 place)
.

Thus, according to the present invention, the number of soldering points is reduced to nine in total. In a general rotary head assembly with two head chips 403, soldering is performed at 17 locations, which is a reduction of 7 locations compared to the conventional 24 locations.

And the conductor 32 of the terminal transformer 31, spatula)'
Pattern 40 of printed circuit board 502 of i-ko 41L head
Only one piece of each of 4 is required, and the part shape becomes simple. For these reasons, the number of assembly steps is significantly reduced, and costs can be reduced.

Furthermore, the number of soldering points is reduced, the shape and structure are simplified, and reliability is significantly improved.

Head 40 and rotary transformer 23.22 according to the invention
A circuit diagram showing the electrical connection with can be expressed as shown in FIG.

Although the above embodiment shows the case where there are two heads 40, it goes without saying that the present invention can be applied by increasing or decreasing the number of head terminals 411, terminal transformers 31, etc. in accordance with the increase or decrease of the number of heads 40.

Effects of the Invention As described above, according to the present invention, in the means for electrically connecting both ends of the coil of the head connected to the rotating drum body to both ends of the coil of the rotor of the rotary transformer, one of the ends of the coil of the rotary drum body is Since the connections are made using the same method, the number of soldering points during assembly can be reduced, and the number of assembly steps can be reduced.

In addition, the number of terminals, printed circuit board patterns, etc. can be reduced, the shape and structure of the parts of the assembly can be simplified, and the number of assembly steps and costs can be reduced.

Furthermore, soldering can improve reliability by reducing the number of parts and simplifying parts.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a rotating drum assembly according to an embodiment of the present invention, showing the rotating drum in a separated state. Figure 2 is a top view of the rotating drum in Figure 1, Figure 3 is a half-sectional view of Figure 2, Figure 4 is a bottom view of Figure 2, and Figure 5 is an enlarged view of the head in Figures 3.4. 6 is a top view of the rotary transformer rotor used in FIG. 1, and FIG. 7 is a circuit diagram of the head and rotary transformer shown in FIG. 1. FIG. 8 is a perspective view of a rotary drum assembly in a conventional example.
The rotating drum is shown separated. 9 is a top view of the rotating drum in FIG. 8, FIG. 10 is a half-sectional side view of the rotating drum in FIG. 9,
Figure 11 is the bottom view of Figure 9, Figure 12 is the bottom view of Figure 10.11.
13 is a top view of the rotary transformer rotor used in FIG. 8, and FIG. 14 is a circuit diagram of the head and rotary transformer shown in FIG. 8. 40...Head, 403...Head coil, 14...Support, 12...Rotating drum, 10...Lower drum body, 22--Rotary transformer stator, 23--Rotary transformer rotor , 245.246...Both ends of the rotor coil, 31...
Insulating member (terminal transformer), 32.133...
- Conductive member, patent applicant: NEC Home Electronics Figure 7 Figure 14 Σ Hill 61 Figure 10 l Figure 11

Claims (4)

[Claims] (1) A rotating drum body having a head on its outer periphery and made of a conductive material, a lower drum body facing the rotating drum body, and a lower drum body arranged concentrically with the rotating drum body and rotating together with the rotating drum body. a rotary transformer rotor having a coil, a rotary transformer stator facing the rotary transformer rotor and fixed together with the lower drum body and having a coil facing the coil of the rotary transformer, both ends of the coil of the head and the A head drum assembly comprising a pair of electrical connection means for electrically connecting both ends of a coil of a rotary transformer rotor, one of the pair of electrical connection means using the rotating drum body. drum assembly. (2) The rotating drum body has a head on the outer periphery, an outer rotating drum made of a conductive material, and an inner rotating drum connected to a central drive shaft, and an inner rotating drum made of a conductive material. A rotating device according to claim 1, comprising a support body, wherein one end of the coil of the head is connected to the outer rotating drum, and one end of the coil of the rotary transrotor is connected to the inner support body. drum assembly. (3) The method according to claim (1) or (2), wherein the other of the pair of electrical connection means uses a conductive member coated with an insulating material and fixed to the rotating drum body. drum assembly. (4) A plurality of heads are assembled to the rotating drum body, and one end of the coil of each head connects the rotating drum body to zero.
The drum assembly according to claim 1 or 2, wherein the drum assembly is connected to one end of a coil of the rotary transformer rotor.