Connecting device for use in a head drum assembly

Details Connecting device for use in a head drum assembly Connecting device for use in a head drum assembly

1999-04-30

2001-10-02

Cao, Allen (Department: 2652)

Dynamic magnetic information storage or retrieval

Head mounting

For moving head during transducing

C360S130320

Reexamination Certificate

active

06297935

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a head drum assembly for use in a tape recorder; and, more particularly, to a connecting device capable of easily connecting a rotary transformer to a video head in a head drum assembly.
BACKGROUND OF THE INVENTION
A tape recorder, such as a video cassette recorder or a video camera, includes a head drum assembly containing a video head which is used to either record or play back the video portion on or off a magnetic tape, an upper drum, a lower drum and a pair of transformers. The head drum assembly is assembled through a series of delicate and time-consuming assembling operations. A locating operation of the video head onto the upper drum and a gap adjustment operation between the transformers and a connecting operation between the video head and a rotary transformer are examples of such particular operations. These operations take a large portion of the total time required in assembling the head drum assembly. In order to reduce the total assembling time of the head drum assembly, various structural modifications have been proposed. One of the prior art head drum assemblies consists of an upper drum and a lower drum which are positioned around an upper portion and a lower portion of a shaft, respectively. The upper drum has a center hole into which a flange is closely fitted. The upper drum also has at least two video heads fastened to a lower surface thereof. The video head has coils wound therearound.
The flange is provided with a rotor transformer fixed on a lower surface thereof. The rotor transformer has a plurality of channels where coils are positioned in a coaxial relationship, respectively.
On the other hand, the coils of the video head and the coils of the rotor transformer are connected with each other by soldering.
However, this type of prior art head drum assembly has a shortcoming in that it is not easy to assemble, due mainly to the way the video head is connected to the rotor transformer, i.e., by soldering. It is difficult to connect the video head and the rotor transformer by using an automated soldering device, since it is too thin or too weak for the coil of the two members to endure thermal energy emitted therefrom.
SUMMARY OF THE INVENTION
It is, therefore, a primary object of the invention to provide a connecting device mounted within a head drum assembly capable of facilitating an easy electrical connection between a video head and a rotor transformer.
Another object of the present invention is to provide a connecting device capable of maintaining a good electrical connecting condition between the video head and the rotor transformer.
Another object of the present invention is to provide a connecting device having a compatibility both with a two-head type head drum assembly and a multi-head type head drum assembly.
The above and other objects of the invention are accomplished by providing a head drum assembly for use in a tape recorder including a holder of a general circular shape having a center hole through which a flange is fitted, a plurality of bosses on top thereof. Each of the bosses is provided with an assembling hole. The head drum assembly further includes a plurality of connectors. Each of the connectors has a body provided with a pair of posts insertable into the assembling hole for allowing the body to be maintained on the holder, a terminal plate for elastically contacting the video head and for elastically contacting the lower transformer. The terminal plate is integrally formed with the body.
As a modification of the present invention, there is provided a head drum assembly comprising: a flange closely fitted into the center hole of the upper drum and having a through hole through which an upper portion of the shaft is mounted and a pair of center protuberances, each of the center protuberances having a pair of edge protuberances formed on both sides thereof; a holder having a first semi circular member and a second semi circular member, each of the semi circular members having a pair of retainers engaging with the pair of edge protuberances, respectively, and a plurality of bosses o n top thereof, each of the bosses provided with an assembling hole; and a plurality of connectors, each of the connectors having a body provided with a p air of posts insertable into the assembling hole for allowing the body to be maintained on the holder, a terminal plate for elastically contacting the video head and for elastically contacting the lower transformer, the terminal plate being integrally formed with the body.


REFERENCES:
patent: 5999381 (1999-12-01), Hong et al.
patent: 0599641 (1994-06-01), None
Search Report under Section 17(5).

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