KR970008605B1 - Drum of tape recorder - Google Patents

Abstract

A drum of a tape recorder which can reduce the size of a tape recorder set is disclosed. In a drum of a tape recorder in which a head which makes contact with a tape and reads the signals of the tape is installed on a lower surface of an upper drum which is rotated by a drum motor, and which transfers the signals read by the head to an amplifier, the drum of a tape recorder comprises an amplifier which is installed on an upper surface of the upper drum and amplifies the signals of the tape read by the head; a signal transferring means which is installed at an upper portion of the upper drum so as to transfer the signals amplified by the amplifier; an intermediate medium means which is installed on an outer side of the signal transferring means and is fixed to a deck so as to transfer the signals generated in the signal transferring means to a main circuit board; a contacting member which is mounted to a tip end of the intermediate medium means and makes contact with an outer surface of the signal transferring means, thereby transferring the signals of the tape to a wafer; a driving means which is mounted in the interior of a lower drum to provide the upper drum with a rotational force; an oscillation sensor which is installed so as to be separated from the driving means and is protruded on one side of the fixing section of the deck.

Description

Drum of tape recorder

1 is a cross-sectional view showing a drum of a tape recorder according to the prior art.

2 is a plan view showing a transformer mounted on the tape recorder of FIG.

3 is a sectional view showing a drum of the tape recorder according to the present invention.

4 is an exploded perspective view showing the main part of FIG. 3 in an enlarged manner.

* Explanation of symbols for main parts of the drawings

10,50: drum 11,51: rotating shaft

12,52: Upper drum 13,53: Lower drum

14,54,84: Tightening screw 15,55: Head

16, 59: flange 17: rotor transformer

18: Stator transformer 19: Rotary transformer

19a: groove 19b: coil

20: wire 21,61: boss

22,62: bearing 23: flexible cable

30,70: drum motor 31: stator

32,73 coil 33,74 stator core

34,71: magnet 35,72: housing

36: support 37,85: deck

38, 75: main circuit board 53a: space part

53b: groove 56: preamplifier

57: circuit board 58: head pin

60: set screw 76: fixing part

77: phase oscillation sensor 78: frame

79: support 80: holder

80a: Circular projection 81: Fixing screw

82: slip ring 82a: conductor

83: bracket 86: bush

87 connector 88 wafer

The present invention relates to a drum of a tape recorder, and more particularly, to a signal transmitting means for transmitting a signal of a tape amplified by a pre-amp IC to a main circuit board, and a drum motor for rotating the drum at high speed. The present invention relates to a drum of a tape recorder, which improves the mounting method, reduces the number of assembly operations, and reduces the tape recorder set (SET).

In general, drums used in magnetic recording and reproducing apparatuses, such as a video tape recorder (VTR), a digital audio tape (DAT), and a camcorder, can record information on a tape or read recorded information.

As shown in FIGS. 1 and 2, a drum of a conventional tape recorder is in contact with a tape surface conveyed along a predetermined traveling path, and the drum 10 is configured to read a signal of the tape. It consists of an upper drum 12 which is press-fitted and rotated at high speed, and a lower drum 13 which is not rotated at a predetermined interval with the upper drum 12.

The head 15 is fixed to the bottom of the upper drum 12 by a fastening screw 14, and a flange 16 is fitted and fixed to the upper portion of the rotating shaft 11 at the center thereof. At one end, a rotor transformer 17 of a rotary transformer 19 made of a ferrite material is mounted. A wire 20 is connected to the head 15 and the rotary transformer 19, and grooves 19a are formed on the upper surface of the rotary transformer 19 by the number of channels of the tape, and the coils 19b are formed in the grooves 19a. ) Is wound.

The boss 21 is fixed to the lower end of the rotary shaft 11 penetrating the lower drum 13 so that the rotary shaft 11 is not detached, and a bearing 22 is inserted into the boss 21. A stator transformer 18 is provided on the upper side of the drum 13 so as to form a predetermined gap with the rotor transformer 17. The stator transformer 18 transmits a signal of a tape to an amplifier (not shown). The flexible cable 23 to be transmitted is connected.

In addition, the drum motor 30 installed in the lower direction of the lower drum 13 to rotate the rotary shaft 11 is fixed to the center of the drum 10, the stator 31 mounted at one end of the lower drum (13) And a stator core 33 on which the coil 32 fixed to the stator is wound, and a housing 35 having a magnet 34 attached thereto to surround the boss 21 fixed to the rotation shaft 11. do.

On the other hand, the drum 10 is inclined at a predetermined angle on the deck (37) by the support 36, the lower side of the deck 37, the main circuit board is maintained at a constant distance from the deck (37) 38) is installed.

In the drum of the conventional tape recorder configured as described above, when a current is applied to the coil 32 wound on the outer circumferential surface of the stator core 33, a magnetic field is induced in the stator core 33 to the inside of the stator core 33 and the housing 35. The rotational force by the interaction of the attached magnet 34 is transmitted to the rotary shaft 11 through the boss 21 and at the same time rotates the upper drum 12, which is press-fitted and fixed on the upper rotary shaft 11, at a high speed.

As such, the state in which the upper drum 12 is rotated at a high speed is an initial state of loading the tape by inserting the tape into the device body. Then, when the tape is transferred to the drum 10 by the drive mechanisms installed on the deck 37, the head 15 fixed to the bottom of the upper drum 12 at which the channel signals formed on the tape are rotated at high speed is read. .

The signal of the tape is transmitted to the rotor transformer 17 of the rotary transformer 19 via a wire 20 soldered to the head 15, and the magnetic force induced in the rotor transformer 17 is transferred to the rotor transformer 17. And magnetic induction in the stator transformer 18 installed to form a predetermined gap, and transmit a signal to the stator transformer 18 by interacting with each other.

The signal (video signal or Hi-Fi signal) transmitted to the stator transformer 18 is transmitted to the amplifier through the flexible cable 23 and amplified and then input to the main circuit board 38. You can record in reverse order.

However, the drum of the tape recorder as described above has a complicated problem of assembling a flexible cable and a rotary transformer that transmits a signal read from the tape to an amplifier, as well as a ferrite used as a material of the rotary transformer, which is fragile and expensive. By fixing the stator of the motor by a fastening screw at one end of the lower drum, the number of labors and the number of parts are increased, and the thickness of the tape recorder has been limited due to the constant distance between the deck and the main circuit board.

Accordingly, the present invention is to solve the above-mentioned conventional problems, an object of the present invention is a pre-amplifier for amplifying the signal of the tape, and a signal transmission means for transmitting the amplified signal to the main circuit board on the upper drum The cost of the drum is reduced by the installation, as well as the labor is reduced, and the preamplifier is installed close to the head to provide a drum of the tape recorder that can improve the image quality.

Another object of the present invention is to form a space portion inside the lower drum, and by inserting a drum motor for rotating the drum at a high speed in the space portion can minimize the distance between the deck and the main circuit board to enable a thinner tape recorder set. To provide a drum of a tape recorder.

A feature of the drum of the tape recorder according to the present invention for achieving the above object is that the head of the upper drum rotated by the drum motor is in contact with the surface of the tape to read the signal of the tape is fixedly installed, In a drum of a tape recorder for transmitting the signal entangled by the amplifier, a preamplifier installed on one side of a circuit board attached to the upper drum, amplifying a signal of the tape read from the head, and a signal amplified by the preamplifier Intermediate means for the signal transmission means is installed on top of the upper drum, and horizontally installed to the outside of the signal transmission means, and fixed on the deck to transmit the signal generated by the signal transmission means to the main circuit board And, it is mounted on the front end of the intermediate intermediary means, while contacting the outer peripheral surface of the signal transmission means A contact member for transmitting a signal to a wafer, driving means mounted on a space portion formed inside the lower drum to provide a rotational force of the upper drum, and spaced apart from the driving means at a predetermined distance, and the phase of the driving means It is composed of a phase oscillation sensor protruding to one side of the fixed portion on the deck for control.

EMBODIMENT OF THE INVENTION Hereinafter, one preferred embodiment of the drum of the tape recorder which concerns on this invention is described in detail with reference to an accompanying drawing.

3 and 4 are diagrams showing the drum of the tape recorder according to the present invention, in which the drum 50, which is inclined at an angle to read the signal of the tape, is rotated at a high speed by being press-fitted and fixed to the center thereof. It consists of an upper drum 52 and a lower drum 53 which is not rotated at a predetermined interval from the upper drum 52.

The head 55 is fixed to the bottom of the upper drum 52 by a fastening screw 54, and a circuit board 57 having a preamplifier 56 is attached to one side of the upper drum 52 by bonding or the like. At 57, a head pin 58 for transmitting a signal read from the head 55 is soldered.

The upper drum 52 In the center of the rotation shaft 51 is inserted into the flange (59) for interference fit is fixed.

In addition, a space portion 53a and a recess 53b are formed on the inner and lower outer circumferential surfaces of the lower drum 53, and a boss screwed by a set screw 60 on the lower end of the rotation shaft 51 passing through the lower drum 53. A bearing 61 is mounted to prevent separation of the rotating shaft 51 and a bearing 62 having a predetermined preload is interposed at upper and lower ends of the boss 61.

In the space portion 53a formed in the lower drum 53, a housing 72 having a magnet 71 attached to the outside and a stator core wound with a coil 73 to form a predetermined gap with the magnet 71. A drum motor 70 composed of 74 is inserted.

The stator core 74 is fixed by a fixing part 76 mounted on the main circuit board 75, and on one side of the fixing part 76, the phase oscillation sensor 77 having a predetermined distance from the magnet 71. ) Is installed.

On the other hand, the holder 80 is fixed to the upper portion of the upper drum 52, the signal transmission means is fitted to transmit the signal read from the head 55 to the circular projection (80a) formed in the upper portion of the holder 80 This signal transmission means is fixed to the holder by a fixing screw 81.

The signal transmission means is composed of a plurality of slip rings 82 having a conductor 82a attached to an outer circumferential surface thereof.

Outside the slip ring 82, a bracket 83, which is an intermediate medium, is fixedly installed on the deck 85 by the fastening screw 84 so as to transmit a signal read from the head 55 to the main circuit board 75. The tip of the bracket 83 is mounted with a bush 86 bent in a semicircle to contact the conductor 82a of the slip ring 82 to transmit a signal.

A wafer 88 is formed in the bracket 83 so that a connector 87 for transmitting a signal from the head 55 to the main circuit board 75 is fitted.

On the other hand, in order to fix the drum 50 inclined at a predetermined angle on the deck 85, the frame 78 is fitted in the groove 53b of the lower drum 53, the lower side of the frame 78 is fastened The support 79 is mounted to be coupled to the screw and fixed on the deck 85, and the main circuit board 75 is installed to be spaced a predetermined distance below the deck 85.

Referring to Figure 3 the operation of the drum of the tape recorder according to the present invention configured as described above is as follows.

First, the frame 78 is inserted into the groove 53b formed on the outer circumferential surface of the lower drum 53, and the drum 50 is seated on the upper portion of the support 79 mounted on the deck 85. The 50 is fixedly installed on the deck 85 at an inclined angle.

After fixing the drum 50 on the deck 85 as described above, if a current is applied to the drum motor 70 and the coil 73 inserted into the space portion 53a of the lower drum 53, the stator core 74 is applied. Magnetism is maintained, and by this magnetic force the rotational force by the interaction of the stator core 74 and the magnet 71 attached to the outside of the housing 72 is transmitted to the rotating shaft 51 through the boss 61, The upper drum 52 press-fitted on the upper part of the rotating shaft 51 is rotated at a high speed.

When the head 55 fixed by the fastening screw 54 on the bottom of the upper drum 52 reads the signal of the tape transferred to the drum 50 side, the signal is transmitted to the upper drum 52 through the head pin 58. It is delivered to the circuit board 57 attached to the upper surface. In addition, the signal transmitted through the head pin 58 enters the preamplifier 56 mounted on one side of the circuit board 57, and then passes through the amplification and channel conversion circuit to the circuit board 57.

In addition, the signal transmitted to the circuit board 57 is transmitted to the plurality of slip rings 82 fixed to the holder 80 on the upper part of the holder 80 by a fixing screw 81, and the bush which contacts the outer peripheral surface of the slip ring 82 ( 86 is transferred to the wafer 88. At this time, the bush 86 bent in a semicircular contact with the conductor 82a attached to the outer circumferential surface of the slip ring 82 to transmit a signal to the wafer 88.

In addition, the signal output to the wafer 88 transfers the signal read from the head 55 to the main circuit board 75 by the connector 87 connected to the wafer 88.

Meanwhile, the phase of the drum motor 70 is controlled by the phase oscillation sensor 77 magnetized on the main circuit board 75, and the wafer 88 is supplied with power for the operation of the preamplifier 56. It passes through the slip ring 82 to the preamplifier 56.

Although the signal transmitting means for transmitting the signal of the tape to the main circuit board in the present invention is installed on the upper drum, the signal transmitting means for transmitting the signal of the tape read from the head can be installed inside and below the drum.

As described above, according to the drum of the tape recorder according to the present invention, not only the cost is reduced when the drum is manufactured, but also the labor time is reduced and the preamplifier is installed close to the head to improve the image quality, and the drum is fixed between the deck and the main circuit board. The thickness of the tape recorder set can be reduced by minimizing the intervals between the two.

Claims (7)

In the drum of the tape recorder, the head of the upper drum rotated by the drum motor is fixed to the head of the tape and reads the signal of the tape. The drum of the tape recorder transmits the signal entangled by the head to the amplifier. A preamplifier installed on one side of an attached circuit board, a preamplifier for amplifying a signal of the tape read from the head, and a signal transmitting means installed on an upper drum to transmit a signal amplified by the preamplifier; Intermediate means mounted horizontally on the deck so as to transmit a signal generated by the signal transmission means to the main circuit board, and mounted to a distal end of the intermediate transmission means, and in contact with an outer circumferential surface of the signal transmission means. While the contact member for transmitting the signal of the tape to the wafer, and to give the rotational force of the upper drum Tape comprising a drive means mounted to the space formed in the interior of the drum, and a phase oscillation sensor is provided to be spaced apart from the drive means by a predetermined distance, and protruded to one side of the fixed portion on the deck for phase control of the drive means Drum of the recorder. The tape recorder of claim 1, wherein the signal transmitting means includes a holder fixed to the upper drum by a fastening screw, and a plurality of slip rings smaller than the number of channels of the drum head on the upper part of the tape recorder. drum. The drum according to claim 1, wherein the intermediate intermediary means comprises a wafer connected to a connector mounted on a main circuit board, and a bracket provided with the wafer horizontally outside the signal transmission means. The drum according to claim 1, wherein the contact member comprises a bush which is in surface contact with the outer circumferential surface of each of the signal transmission means to transfer a signal of the tape to the main circuit board. According to claim 1, The drive means, the housing is inserted into the space portion of the lower drum, the magnet attached to the outside of the housing, and the predetermined gap between the magnet is formed by the fixing portion of the main circuit board A drum of a tape recorder, wherein the drum is a drum motor including a stator core wound around a fixed coil. 3. The drum of claim 2, wherein the slip ring has an inner diameter equal to the outer diameter of the circular protrusion formed on the holder, and a conductor is attached to the outer circumferential surface so as to contact the contact member to transmit a signal. The drum of the tape recorder according to claim 3, wherein one end of the bush is bent in a semicircle so as to contact the outer circumferential surface of the slip ring.