KR100551340B1 - Head drum structure of video cassette recorder - Google Patents

Abstract

According to the present invention, the upper drum 7 to which the magnetic recording medium is in contact, the magnetic head 20 mounted on the upper drum 7 to pick up a signal from the magnetic recording medium, and the signal from the magnetic head 20 are contactless. In the VCR head drum assembly comprising a rotary transformer applied to the rotary transformer and a lower drum (3) on which the rotary transformer is supported, the main PCB (60) from the coil pattern portion (10a) and the coil pattern portion (10a) provided in the rotary transformer It characterized in that it comprises a flexible PCB (10) is formed integrally with the cable (10b) leading to the terminal and the terminal portion (10c) connected to the main PCB (60). Accordingly, the present invention is fixed by eliminating the process of winding the coil on the trans stator, the process of soldering, etc. to be connected to the cable for connecting to the main PCB, and the separate process of coupling the terminal to the connector to the main PCB. Simplified and cost-saving, the use of integral parts more reliably prevents disconnection of coils and short circuits of connections, which enhances durability and maintainability. Mutual noise interference is reduced on the signal.

Description

HERC DRUM STRUCTURE OF VIDEO CASSETTE RECORDER

1A is a cross-sectional view illustrating a conventional VCR head drum assembly;

1B is an exploded perspective view showing a conventional VCR head drum assembly;

2A is a partial cross-sectional view of a VCR head drum assembly in accordance with a preferred embodiment of the present invention;

Figure 2b is a plan view of a flexible PCB according to a preferred embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

1: lower drum 2: shaft

3: trans stator 4, 9: coil

8: trans rotor 10: flexible PCB

20: magnetic head 40: motor stator

50: motor rotor 60: main PCB

The present invention relates to a flexible PCB mounted on a video cassette recorder (VCR) head drum assembly. More particularly, the present invention relates to a flexible PCB in which a coil is formed in a predetermined pattern, a cable, and a terminal. And a cutout and a through hole in the head, a connection between the drum head and the main PCB can be formed with a simpler structure, and the cable and the terminal portion can protrude from the coil pattern portion in a short length so that the main PCB can be located at a corresponding position. A VCR head drum assembly in which a flexible PCB can be directly connected to the main PCB by placing a connector of the present invention.

The VCR records a signal on the main base, a traveling system installed on the main base to take out the tape from the cassette and moves along a predetermined path, and records a signal on the moving tape which is disposed at a suitable location of the traveling system, and signals from the tape. It has a head drum assembly to play it.

In particular, since the head drum assembly includes a video magnetic head that directly records and reproduces a video signal, the head drum assembly must maintain a very high level of reliability and stability, and should be free from vibration and noise even after repeated use for a long time. .

In particular, in the head drum assembly, since the media and the magnetic head are in physical contact with each other due to the reproduction characteristics of the magnetic recording medium such as video tape, the signal is likely to be generated, and the picked-up signal supports the magnetic head. In this process, minimizing vibration and mutual interference noise is an important factor in determining the quality of reproduction because it is transmitted to the main PCB through the magnetic head base embedded with the PCB and in a non-contact signal transmission method.

As a means for implementing the non-contact signal transmission, the head drum assembly is provided with a rotary transformer for transmitting and receiving a signal input or output to the video magnetic head in a non-contact manner, the rotary transformer is a rotor that rotates with the video magnetic head; It consists of a stator corresponding to this rotor to maintain a steady state.

The stator communicates with the main PCB including a preamp installed on the main base in a wired manner, and a flexible PCB is used as the wired signal transmission means.

1A is a cross-sectional view showing a conventional VCR head drum assembly, and FIG. 1B is an exploded perspective view showing a conventional VCR head drum assembly.

As shown, the conventional head drum assembly has a large rotatable shaft 2 and an upper drum 7 rotatably mounted about the shaft 2 and having a magnetic head 20 for picking up a signal from the medium. And a lower transformer 1 fixedly installed, and a rotary transformer composed of a transformer rotor 8 and a transformer stator 3 which are installed between the upper drum 7 and the lower drum 1 and transmit signals in a non-contact manner. And a PCB flat cable 10 connected to the trans stator 3 to transmit a signal to the main PCB 60.

In the above-described axial fixed head drum assembly of the general VCR, the lower drum 1 is provided with a predetermined recessed portion 1a at the bottom, and the shaft 2 is press-fitted and fixed at the center thereof, and the transformer is pressed against the bottom. The stator 3 is installed.

The trans stator 3 has a plurality of concentric channels 3a formed on the upper surface thereof, and a stator coil 4 is wound around each of the channels 3a, and finely spaced apart from the upper surface of the trans stator 3 so as to form a trans rotor ( 8) is provided, the transformer rotor 8 is provided with a plurality of concentric channels 8a formed opposite to the stator coil 4, and the rotor coil 9 is wound around each of the rotor channels 8a.

The stator coil 9 is in contact with the connecting portion 11 formed at one end of the flexible flat cable 10, the terminal portion 12 formed at the other end of the flexible flat cable 10 is a socket ( 62 is inserted and connected.

The trans rotor 8 is installed in the upper drum 7 which forms the cylindrical drum body with the lower drum 1, and the upper drum 7 has a through hole through which the shaft 2 is rotatably inserted, and the shaft 2 ) And through-holes are provided with bearings 6 on the upper and lower sides at positions corresponding to each other.

The upper drum 7 here comprises a magnetic head 20 and a magnetic head base 23 mounted with a PCB (not shown) to which the coil 9 wound on the magnetic head 20 is soldered and connected. A through hole is formed in the head base 23 so that the coil 9 passing through the through hole is connected to the coil 9 wound on the transformer rotor 8.

And a drum motor is installed at the upper end of the shaft (2) and the lower drum (7), the drum motor includes a motor stator 45 and a motor rotor 50, the motor stator 40 is a shaft (2) The boss 42 is coupled to the upper end of the () and the set screw 41 is fastened in the radial direction, the back yoke 43 is fixed to the lower end of the boss 42, and is mounted on the lower surface of the back yoke 43 The motor stator coil 44 is included, and the motor rotor 50 is fixed to the plate 52 fastened to the upper surface of the upper drum 7 by a plurality of fixing screws 5 and to the upper surface of the plate 52. The motor magnet 53 is included.

Operation of a conventional VCR head drum assembly having such a configuration is as follows.

When a video cassette tape (not shown), which is a magnetic storage medium, is inserted and the tape is placed in contact with the head drum assembly by a traveling system (not shown), the upper end of the shaft 2 and the upper end of the upper drum 7 are provided. The upper drum 7 is rotated by the electromagnetic action of the drum motor, and the analog data stored in the contacted magnetic tape is picked up as a data signal by the magnetic head 20 provided in the upper drum 7.

The signal input from the magnetic head 20 is transmitted by a coil 9 which is soldered to the PCB mounted on the magnetic head base 23 and protrudes through the through hole, and the transformer rotor 8 on which the coil 9 is wound. Is reached, the signal is applied to the trans stator 3 in a non-contact manner while the trans rotor 9 is rotated about the stator rotor 3 which is spaced apart slightly.

The signal applied to the trans stator 3 is transmitted to the preamplifier and the main PCB 60 through the flexible flat cable 10 connected to the trans stator 3.

However, the structure of the head drum assembly as described above causes considerable interference noise due to the overlap of the coils wound on the trans stator, and the length of the flexible PCB cable, and the process of winding the coils on the trans stator and the flexible PCB caves. The process of connecting with solder or the like is added to increase the difficulty and cost of manufacturing, and there is a problem of low maintenance and repairability due to the high risk of disconnection in exposed coils and connections.

The present invention is to solve the above-mentioned conventional problems, the present invention is to reduce the coral interference noise generated during the application process of the non-contact signal and the signal transmission to the main PCB, the difficulty of the manufacturing process by changing to a simpler structure And a VCR head drum assembly which aims at cost reduction.

The present invention for realizing the above object comprises an upper drum to which a magnetic recording medium is in contact, a magnetic head mounted on the upper drum to pick up a signal from the magnetic recording medium, and a rotary to which a signal from the magnetic head is applied in a non-contact manner. In a VCR head drum assembly comprising a transformer and a lower drum on which a rotary transformer is supported, a coil pattern portion provided in a rotary transformer and a cable from a coil pattern portion to a main PCB and a terminal portion connected to the main PCB are integrally formed. Characterized in that it comprises a PCB.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

2A is a partial cross-sectional view of a VCR head drum assembly in accordance with a preferred embodiment of the present invention, and FIG. 2B is a plan view of a flexible PCB in accordance with a preferred embodiment of the present invention.

As shown, the VCR head drum assembly according to the invention comprises an upper drum 7, a magnetic head 20 mounted on the upper drum 7 and picking up a signal from the medium, and a signal from the magnetic head 20. Cable connected to the main PCB 60 from the rotary transformer, the lower drum 3 on which the rotary transformer is supported, and the coil pattern portion 10a and coil pattern portion 10a provided in the rotary transformer. 10b) and the terminal portion 10c connected to the main PCB 60 includes a flexible PCB 10 formed integrally.

According to a preferred embodiment of the present invention, the upper drum 7 is rotatably installed on the shaft 2, the magnetic head 20 is installed, and a rotary transformer is installed at the lower end.

The magnetic head 20 is composed of a head chip 22 for picking up a signal and a head base 23 on which the head chip 22 is supported and fixed, and on which the PCB is mounted. Connected to each other by means of which the coils 9 are connected to the rotary transformers located below, the upper transformer rotors 8 of the components of the rotary transformers are formed with a plurality of channels 8a and the coils 9 are wound. do.

A transformer stator 3 is disposed below the rotary transformer, and a coil pattern portion 10a in which the coil 4 forms a pattern, a cable 10b as an extension portion, a main PCB 60, and an upper surface of the transformer stator. The flexible PCB 10 in which the terminal part 10c to be connected is integrally formed is provided.

The trans stator 3 is seated on the lower drum 1, and a portion of the lower drum 1 is cut or formed so that the terminal portion 10c of the flexible PCB 10 may protrude. 10c is inserted into and connected to the connector 62 of the main PCB 60, the terminal portion 10c may be formed of a socket-type connector 15 to enhance assembly.

The operation of the VCR head drum assembly having such a structure is performed as follows.

When electric power is applied to the head drum, signals are picked up by the magnetic head 20 which contacts the magnetic recording medium (not shown) while the upper drum 7 rotates in accordance with the relative rotation of the motor drums 40 and 50. .

The picked-up signal is transmitted to the rotary transformer, and the signal transmitted to the transformer rotor 9, which is an upper component of the rotary transformer, is applied to the lower component transformer stator 3 in a non-contact manner.

Here, the trans rotor 8 has a magnetic flux strengthened by the coil (9) connected to the head and wound on the lower side, the coil is finely spaced in the upper side of the opposing trans stator (3) in a predetermined pattern Arranged coil pattern portions 10c are disposed, and signals are applied by relative rotation with each other.

The applied signal is transmitted through the cable 10b extending from the coil pattern portion 10a, and the terminal portion 10c formed at the end of the cable 10b is finally connected to the connector 62 of the main PCB 60. It is processed by the main processor 60.

At this time, since the terminal portion 10c is formed of a socket-type connector 15, the terminal portion 10c can be simply assembled to the main PCB 60.

As described above, according to the preferred embodiment of the present invention, the coil pattern portion 10a, the cable 10b, and the flexible PCB 10, in which the coil portion 10c and the terminal portion 10c are integrally formed, are used. And a cutout and a through hole in the head, a connection between the drum head and the main PCB 60 can be formed in a simpler structure, and the cable 10b and the terminal portion 10c are shorter from the coil pattern portion 10a. The flexible PCB 10 can be directly connected to the main PCB 60 by arranging the connector 62 of the main PCB at the corresponding position because it can protrude.

As described above, the VCR head drum assembly according to the present invention includes a process in which a coil is wound on a trans stator, a process in which solder is connected to a cable for connection with a main PCB, and a terminal connected to a connector in a main PCB. By eliminating the separate process, the fixing is simplified and the cost is reduced, and the integrated parts are used to more stably prevent disconnection of the coil and short circuit of the connection part, which enhances durability and maintainability. Because of the reduction, mutual noise interference is reduced on the signal to the main PCB.

What has been described above is just one embodiment for implementing the VCR head drum assembly according to the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, the gist of the present invention Without departing from the technical spirit of the present invention to the extent that any person of ordinary skill in the art to which the present invention pertains various modifications can be made.

Claims (3)

An upper drum to which a magnetic recording medium is in contact, a magnetic head mounted on the upper drum to pick up a signal from the magnetic recording medium, a rotary transformer to which a signal from the magnetic head is applied in a non-contact manner, and the rotary transformer being supported A VCR head drum assembly comprising a lower drum, Flexible PCB in which the coil pattern portion installed in the rotary transformer and the cable from the coil pattern portion to the main PCB and the terminal portion connected to the main PCB are integrally formed. VCR head drum assembly comprising a. The method of claim 1, A cutout or through hole is formed in the lower drum, and the terminal portion of the flexible PCB is directly connected to the terminal portion of the main PCB disposed at a corresponding position through the cutout or through hole of the lower drum. VCR head drum assembly, characterized in that. The method of claim 1, The terminal portion of the flexible PCB and the terminal portion of the main PCB is connected to each other by a socket type connector VCR head drum assembly, characterized in that.

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