JPH058663Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a coaxial rotary transformer used in a magnetic recording/reproducing device, etc., and particularly relates to an improvement in the structure of a lead connection terminal holding portion.

[Technical background of the invention and its problems] A coaxial rotary transformer has a cylindrical outer core,
It has a cylindrical inner core that is rotatably inserted into the outer core, and coils are inserted into fitting grooves formed on the inner and outer circumferential surfaces of each core, the number of stages corresponding to the channel used. The terminals of the coils for each channel are guided to the ends of each core, and the leads are connected to each terminal via a lead connection terminal holder attached thereto.

However, in recent years, this type of rotary transformer has become multi-channel, and many 4-channel, 6-channel, etc. transformers have appeared. Therefore, the number of lead connection terminals increases,
This has led to an increase in the size of the device, making lead extraction and terminal connections more complicated and difficult, leading to lower work efficiency and higher prices.

[Purpose of the invention] The present invention was developed in view of the above circumstances, and can contribute to the miniaturization of equipment, improve work efficiency,
It is an object of the present invention to provide a rotary transformer equipped with a lead connection terminal holding portion that can achieve low cost.

[Summary of the invention] In order to achieve the above object, the present invention has a cylindrical outer core having a plurality of stages of coils fitted onto the inner peripheral surface thereof, and a cylindrical outer core having a size to be inserted into the outer core. In a coaxial rotary transformer, a plurality of stages of coils are fitted and arranged on the outer peripheral surface of an inner core, and a holding member that holds the lead connection terminal of each coil is attached to the end of each core. The outer peripheral surface of the inner core has a plurality of coil extraction grooves along the axial direction provided at predetermined intervals in the circumferential direction, and the outer peripheral surface of the inner core has a plurality of coil extraction grooves provided at predetermined intervals in the circumferential direction. It has a plurality of coil extraction grooves smaller than the total number of the coils along the provided axial direction, and each terminal holding member attached to the outer core and the inner core protrudes from a position corresponding to the coil extraction groove and has a plurality of terminals. has a plurality of protruding legs smaller than the total number of the implanted coils and a lead guide groove for guiding the pulled-out leads to each terminal of the protruding legs, and the leads are arranged between adjacent protruding legs. It is characterized by having a lead guide groove for guiding.

[Example of idea] The present invention will be specifically explained below using examples.

FIG. 1 is a perspective view of a device mainly composed of an outer core used in a coaxial rotary transformer according to an embodiment of the present invention, and FIG. 2 is a perspective view of a device mainly composed of an inner core.

In FIG. 1, reference numeral 1 denotes a cylindrical outer core made of ferrite or the like, which has coil grooves 1B formed in a plurality of stages (six stages in the figure) at predetermined intervals in the axial direction on the inner circumferential surface, and It has a plurality of (four in the figure) coil extraction grooves 1A along the axial direction formed at predetermined intervals on the outer peripheral surface. Coils 2 are fitted into the coil grooves 1B for each channel. 3 is a lead connection terminal holding section provided at the bottom of the outer core 1, and includes a main body 31 consisting of an upper ring 31A and a lower ring 31B, and is arranged at predetermined intervals in the circumferential direction of this ring. It has a plurality of (four in the figure) protruding legs 32 that are connected and supported and protrude outward from the connecting part, and a plurality (three in the figure) of the protruding legs 32 are provided on the bottom surface of the protruding legs 32. Terminal 7 is implanted. Furthermore, a lead guide groove 33 is formed in one surface of each protruding leg portion 32 along the axial direction. Furthermore, a lead guide groove 34 is provided along the circumferential direction between the lower ring 31B of the lead connection terminal holding portion main body 31 and the bottom of the outer core 1.
is formed. Another lead guide groove 34 is formed on the opposite surface.

In Fig. 2, numeral 4 indicates a cylindrical inner core made of ferrite or the like, and a plurality of cores (four in the figure) are formed along the axial direction at predetermined intervals on the outer circumferential surface.
It has a coil extraction groove 4A and a ring-shaped coil groove 4B formed in multiple stages (six stages in the figure) along the axial direction. The diameter of the inner core 4 is large enough to be inserted into the outer core 1.
Reference numeral 5 denotes a plurality of coils (six channels in the figure) which are fitted into each channel in the coil groove 4B. Reference numeral 6 denotes a lead connection terminal holder provided at the bottom of the inner core 4, which includes a ring-shaped main body 61 having a stepped portion, and a plurality of lead connection terminal holding parts formed at the bottom of the main body 61 at predetermined intervals in the circumferential direction and protruding downward. (four in the figure) protruding leg parts 62, and each coil extraction groove 4A of the inner core 4 and the protruding leg part 6
It has a lead guide groove 63 formed over 2. A plurality of (three in the figure) terminals 8 are implanted on the bottom surface of each protruding leg portion 62, respectively.

Next, with reference to FIGS. 3 and 4, the specific structure of each lead connection terminal holding portion and the manner in which the leads are pulled out will be described.

FIG. 3 is a bottom view of the lead connection terminal holding portion 3 provided on the outer core 1. In the same figure, 31B
is the lower ring, and four protruding legs 32A to 32D are arranged at predetermined intervals along the circumferential surface of this ring.
A guide groove 33 is formed in each leg, and terminals 7 arranged on three sides are implanted in the bottom of the leg. In addition, 34A and 34B are the lower ring 31
This is a guide groove provided between B and the outer core. In such a structure, lead extraction from the coil for each channel is performed as follows. That is, from each coil extraction groove 1A provided on the outer peripheral surface of the outer core, both terminal leads L of each coil are connected.
11, L12 (1 channel), L21, L22
(2 channels), L31, L32 (3 channels), L41, L42 (4 channels), L51,
L52 (5th channel), L61, L62 (6th channel) are pulled out to the bottom, and the first leg 32
At A, the leads L11 and L12 for one channel are pulled out from the circumferential surface of the leg part through the guide groove 33 and connected to the terminal 7, and the adjacent coil lead-out groove 1
One lead L51 for channel 5 is pulled out from A along the guide groove 34A and connected to the terminal 7 via the guide groove 33 of the leg portion 32A. Next, the leg portion 32B has a 2-channel lead L2.
1, L22 is guided from the coil extraction groove 1A along the leg peripheral surface and connected to the terminal 7 via the guide groove 33, and one lead L6 for 6 channels is connected to the terminal 7 through the guide groove 33.
1 is similarly connected to the remaining terminal 7 via the coil extraction groove 1A, the leg peripheral surface, and the guide groove 33. In addition, three-channel leads L31 and L32 are pulled out from the protruding leg portion 32C via the coil extraction groove 1A, the peripheral surface of the leg portion, and the guide groove 33, and are connected to the terminal 7, and correspond to the protruding leg portion 32B. The other lead L62 for six channels, which is drawn out through the coil extraction groove 1A and the guide groove 34B, is similarly drawn out through the circumferential surface of the leg portion 32C and the guide groove 33, and is connected to the terminal 7. 4 channel leads L41 and L42 pulled out from the coil extraction groove 1A are connected to the terminal 7 via the leg peripheral surface and the guide groove 33 to the last protruding leg part 32D, and the 5 channel leads L41 and L42 pulled out in the same manner are connected to the terminal 7 through the leg peripheral surface and the guide groove 33. The other lead L52 for the channel is connected to the terminal 7 of the same leg 32D.

FIG. 4 is a bottom view of the lead connection terminal holding part 6 provided at the bottom of the inner core 4, and 61 is a ring-shaped main body, and four protruding legs are arranged at predetermined intervals along the circumferential surface of the ring part. A guide groove 63 is formed in each leg, and three terminals 8 are implanted in the bottom of each leg. Then, each coil terminal lead led from each coil lead-out groove 4A provided on the circumferential surface of the inner core 4 is pulled out to the bottom surface for each channel, and connected to each terminal in substantially the same manner as in the case of FIG. 3 described above. Connected. That is, the leads L11 and L12 for the 1st channel and one lead L51 for the 5th channel led from the adjacent leg 62D along the stepped part of the main body are connected to the first leg 62A, and the leads L51 for the 5th channel are connected to the first leg 62A. Leg 6
Leads L21 and L22 for the 2nd channel and one lead L61 for the 6th channel are connected to the 2B, and leads L31 and L32 for the 3rd channel are connected to the third leg 62C. The other lead L62 for 6 channels led from the section 62B is connected to the fourth leg section 62.
Leads L41 and L42 for the 4th channel and the other lead L52 for the 5th channel are connected to D.

In this way, the terminal leads from each coil are pulled out in order and are reliably connected to each terminal.

The outer member and inner member obtained as described above are assembled as a coaxial rotary transformer by inserting the inner core 4 shown in FIG. 2 upside down into the outer core shown in FIG. 1, put into use.

According to this embodiment, although it has a 6-channel configuration, the four protruding legs are used to connect the leads of four channels, and the adjacent channels are used to connect the leads of the remaining two channels. Therefore, the number of terminal holding parts and the number of terminals can be minimized.

The present invention is not limited to the above embodiments. In the above embodiment, each core is shown as an integral cylindrical core, but each core may be constructed by laminating a plurality of ring-shaped cores.

[Effects of the invention] According to the invention described in detail above, the lead connection terminal holding member that allows reliable and easy lead extraction and connection is provided, so even if the number of channels increases, the assembly work becomes easy. Therefore, we can provide a rotating transformer that can improve work efficiency and reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of an outer member mainly composed of an outer core, FIG. 2 is a perspective view of an embodiment of an inner member mainly composed of an inner core, and FIGS. 3 and 4 respectively show each of the above-mentioned members. FIG. 3 is a bottom view showing the structure of a lead connection terminal holding member attached to the. 1... Outer core, 2, 5... Coil, 3, 6...
...Lead connection terminal holding member, 4...Inner core,
7, 8...terminal, 32, 32A to 32D, 62,
62A to 62D...Protruding leg portion, 33, 63, 3
4, 34A, 34B...Guide groove.

Claims (1)

[Claims for Utility Model Registration] (1) An outer periphery of a cylindrical inner core having a size that allows it to be inserted into the outer core, in which multiple stages of coils are fitted onto the inner peripheral surface of the cylindrical outer core. In a coaxial rotary transformer in which multiple stages of coils are fitted and arranged on a surface, and a holding member that holds the lead connection terminals of each coil is attached to the end of each core, the inner peripheral surface of the outer core has a circular shape. having a plurality of coil extraction grooves smaller than the total number of the coils along the axial direction provided at predetermined intervals in the circumferential direction,
The inner core has a plurality of coil extraction grooves provided at predetermined intervals in the circumferential direction and smaller than the total number of the coils along the axial direction on the outer peripheral surface of the inner core, and each terminal attached to the outer core and the inner core. The holding member protrudes from a position corresponding to the coil extraction groove, and includes a plurality of protruding legs smaller than the total number of the coils in which a plurality of terminals are implanted, and a lead guide that guides the pulled-out lead to each terminal of the protruding leg. A coaxial rotary transformer characterized by having a groove and a lead guide groove for guiding a lead between adjacent protruding leg parts. (2) The number of stages of coils fitted and arranged in each core is 6, the number of coil extraction grooves along the axial direction of each core is 4, and the number of protruding legs of the terminal holding member is 4.
The coaxial rotary transformer according to claim 1, wherein the number of terminals implanted in each projecting leg is three.