JPH023611Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention is based on a system in which rotation sensors in various control devices, detection devices, etc. transmit signals sensed by a rotating head of a video tape recorder, etc. to a stationary circuit part. Or, conversely, it relates to a rotary transformer that is widely used as a means for transmitting control or recording signals to rotating parts.

(Prior art) In a rotary transformer, improving signal interference between channels for signal transmission, that is, crosstalk, leads to improved characteristics of the rotary transformer as a whole. Various methods have been used to improve the crosstalk characteristics. It is being

For example, a so-called separate type rotary transformer is known in which a shot ring is inserted between each channel to improve the amount of crosstalk, or a so-called separate type rotary transformer in which ferrite cores having channel grooves are separated by an annular non-magnetic material.

A conventional separate rotary transformer is shown in FIG. 3 or 4. In the conventional example shown in FIG. 3, a ring-shaped ferrite core 3 having a winding 2 is bonded to the outer and inner peripheries of a ring-shaped non-magnetic material 1 having a rectangular cross section.

Further, in the embodiment shown in FIG. 4, a flat non-magnetic material 4 has a protruding part 5 for separating the cores, and a ring-shaped ferrite core with a winding 2 is provided on both sides of this protruding part. 3 are glued together.

(Problems to be solved by the invention) First, in the case of the conventional example shown in Fig. 3, the adhesion between the core and the non-magnetic material that is the separating member is the adhesion between the circumferential surfaces. However, it is extremely difficult to perform adhesive bonding work with high precision, and the adhesive strength is weak, making it impractical. In addition, in the case of the conventional example shown in FIG. 4, although the adhesive strength is sufficient, the parallelism of this separate rotary transformer cannot be set to a predetermined value simply by bonding the core. It is necessary to polish the core 3 and the non-magnetic material 4, and polishing the non-magnetic material 4 has been difficult.

As described above, it has been difficult to easily produce a separate rotary transformer with high precision and high strength.

Furthermore, by grounding the separation member, the crosstalk characteristics are further improved than by separating it, but in conventional separate type rotary transformers, it is not easy to ground the separation member.

(Means for Solving the Problems) In order to solve the above problems, the present invention uses a separating member having a T-shaped cross section and a non-magnetic material having a screw insertion hole in the axial direction. On the inner circumferential side of the separating member, a step is provided at the ridge between the outer circumference of the core and the surface on which the winding is applied, and on the outer circumferential side of the separating member, there is a step between the inner circumference of the core and the surface on which the winding is applied. A step is provided at the ridge of the cylinder, the step of the ridge of the core is supported by a radial protrusion of a separation member having a T-shaped cross section, and a screw is inserted into the screw insertion opening of the separation member. , which is screwed directly to the cylinder.

(Function) In the present invention, since the core is directly fixed to the cylinder by the separating member, there is no need to use an adhesive, and moreover, the core can be fixed with sufficient strength. Also,
By manufacturing the core, separation member, cylinder, etc. with high precision, it is possible to easily and accurately integrate the product.

(Embodiment) FIG. 1 is a plan view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG. 1. This embodiment is a two-channel rotary transformer, and an inner core 6 is provided with a channel coil 7, and a stepped portion 8 is provided on the ridge of the outer circumference of this core 6. A channel coil 10 is also provided on the outer core 9, and a stepped portion 11 is provided on the ridge portion of the inner circumferential portion. The separation member 13 that attaches and fixes the two cores 6 and 9 to the cylinder 12 has a T-shaped cross section and has through holes into which four screws are inserted. Further, the cylinder is provided with a screw hole at a position corresponding to the screw through hole of the separating member. And the core 6,
The step portions 8 and 11 on the outer periphery or inner edge of the separation member 9 are engaged with the radial protrusion of the separation member, and the separation member is attached to the cylinder and fixed with a screw 14.

(Effects of the invention) In the present invention, the core and separation member are screwed directly to the cylinder, and installation is extremely easy.In terms of accuracy, the core, separation member, and cylinder are made with high precision. The desired high precision can be achieved, and the strength can be sufficiently satisfied by adjusting the tightening condition of the screws.Also, the separation member can be grounded at the same time as it is installed and fixed, making it easy to reduce crosstalk characteristics. This is an extremely useful separate rotary transformer device that can be improved upon.

[Brief explanation of drawings]

FIG. 1 is a plan view of one embodiment of the present invention, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view of a conventional example. Figure 4 is
FIG. 3 is a cross-sectional view of another conventional example. 6,9... Core, 7,10... Coil, 8,1
1...Step part, 12...Cylinder, 13...Separation member, 14...Screw.

Claims (1)

[Scope of utility model registration request] A separate type rotary transformer has signal transmission windings on opposing surfaces of opposing disk-type ferrite cores, and the disk-type ferrite core is a separate type rotary transformer in which a plurality of ferrite cores are integrated via a non-magnetic separation member. In the device, the non-magnetic separating member has a cross section T
The core is ring-shaped and has a through hole into which a screw can be inserted in the axial direction, and is disposed on the inner peripheral side of the non-magnetic separation member, and the core has a stepped portion that engages with the non-magnetic separation member. on an outer peripheral ridge, and the core disposed on the outer peripheral side of the non-magnetic separation member has a step portion on an inner peripheral ridge that engages with the non-magnetic separation member,
Further, the cylinder is provided with a screw hole at a position corresponding to the through hole of the non-magnetic separation member, and the core and the non-magnetic separation member are arranged at predetermined positions of the cylinder and fixed with screws. Separate type rotary transformer device featuring: