KR20010000708U - video cassette recorder head using two printed circuit board - Google Patents

Abstract

The present invention relates to a VCR (VTR) device, in particular, the recording / replaying signal or the recording / reproduction current from the head core 13 to the PCB 15 of the head base 12 through the coil 14 during recording / playback In the heading VCR head 11, the recording / reproducing VCR head 11 has two independent signals from two head cores 13, each having two different signals attached to the recording / reproducing VCR head 11, respectively. High-density recording / reproducing VCR head, characterized by having a PCB (15) for dividing the existing PCB into two to be able to go out / out, to prevent the interference of the signal, accurate information storage, it is possible to clean during recording, playback The purpose is to provide an effect of recording / reproducing a video signal capable of obtaining clear and sharp image quality.

Description

Video cassette recorder head using two printed circuit boards

The present invention relates to a VCR head having two PCBs in the head base. In particular, in the case of a high-density VCR head, the recording / reproducing signal flows in and out of the two head cores simultaneously during recording / reproducing, thereby causing mutual interference. Noise is generated, which is related to a VCR head that has two PCBs attached to remove the noise.

General magnetic recording and reproduction such as a VCR (VTR) or an audio tape recorder is caused by sliding between a gap portion of a magnetic head and a recording medium such as a magnetic tape or a magnetic disk. Since the frequency of the recording signal is related to the magnetic head, the material and structure of the magnetic tape, and the like, it is preferable to operate in a combination matching each condition.

Currently used for general magnetic recording is a ring-shaped magnetic head. The coil is wound around an annular core with a narrow gap in part. It is preferable to generate magnetic force lines inside the core by the recording current applied to the coil at the time of recording, to introduce them to the tip of the gap where they are tightened, and generate a concentrated leakage magnetic field. Therefore, it is made of soft magnetic material such as permallow and ferrite with high permeability, and it is considered to reduce the loss of the maximum force in the shape and the position of the coil. The size of the shape ranges from large to 10 mm 2, thickness of several mm to small size in the audio head, but the video head is generally small, 2 to 3 mm 2 and thickness of 10 mm. The gap length is about 0.3 to 1 micron in the audio head. In addition, a ferrite material with a high resistivity is used for a video head that records signals of several MHVs because current is generated in the core in response to changes in magnetic flux, thereby lowering high-frequency permeability. In the case of the permaloid material widely used in audio heads and the like, a thin plate having a thickness of about 0.1 mm is laminated and used as a structure in which eddy currents are less likely to flow. Since the miniaturization of the core is related to the shortening of the data, it is preferable to reduce the Rc and to make the gap tip joining type so that the leakage magnetic field is concentrated at the tip. However, when the gap length is minimized, Rg is reduced to adversely affect the following.

In the proxy, leakage flux decreases, which reduces recording efficiency.

When magnetic saturation occurs in the core due to the increase of the recording current, such as when recording on home magnetic tape, the magnetic field distribution near the gap is widened, which adversely affects the target short wavelength recording.

During regeneration, the output decreases because the magnetic flux Φ c that links with the coil is proportional to Rg / (Rc + Rg).

However, Rc: magnetic resistance of the core, Rg: magnetic resistance of the gap, Rd: leakage magnetic resistance, Qc: magnetic flux in the core, 0g: magnetic flux in the cap, Qd: leakage magnetic flux, Rt: magnetic resistance in the tape.

In addition, "gap loss" occurs during regeneration. This loss is better if the recording wavelength is shorter the gap length, the conditions contrary to the adverse effects described above. Therefore, the dimension of the head is determined to an appropriate value in consideration of both conditions.

In general, a VCR (VTR) is a device for recording a video signal and an audio signal on a magnetizable video tape and reproducing the video signal if necessary to view it through a display means such as a CRT or a TV. The configuration of is as shown in FIG.

Referring to the configuration shown in FIG. 1, the color video signal received will be briefly described through fixing at the time of recording / reproducing.

First, in the case of recording, the color image signal input through the low pass filter (LPF) 21 and the high pass filter (HPF) 22 is separated into a luminance signal and a carrier color signal, and the separated luminance signal is FM-modulated. Amplified. In addition, the separated carrier color signal has a frequency characteristic of 3.58 MHz, which is converted to a low frequency band of 767 kHz (exactly 767.0473 kHz) and amplified to a predetermined size. Thereafter, the luminance signal modulated by the FM in the mixing circuit is superimposed on the low level signal state and recorded on the tape through the video head 11.

On the other hand, during playback, the information recorded on the tape is accessed through the video head, and the weak signal is amplified to a predetermined size through the amplifier. The amplified signal is separated into an FM modulated luminance signal and a carrier color signal converted into a low frequency band through a low pass filter (LPF) 23 and a high pass filter (HPF) 24. Thereafter, the FM modulated luminance signal is restored to the original luminance signal through the FM demodulation circuit, and the carrier color signal converted to the low frequency band is inversely converted from the low frequency band of 767 kHz to the original 3.58 MHz frequency band. At the same time, the time-base variation (i.e., jitter component) of the signal generated during reproduction is eliminated. Thereafter, the luminance signal and the carrier color signal are mixed through the mixing circuit to be restored to the original video signal.

In general, the video head 101 is mounted to the rotating drum device while being supported by the head base 102. The conventional head base 102 has a mounting hole in a rotating drum device at the center thereof, and is configured to support the video head 101 element at the front end of the drum mounting reference plane side, and to arrange the terminal plate on the rear side. However, when designing the video head 101, a separate structure is required depending on the magnitude of the drum diameter of the rotating drum device as a target. In general, as shown in FIG. 2, when the VCR head 101 records / reproduces, a recording / reproducing signal is transmitted to the PCB 105 through the coil 104 and the current transmitted to the coil 104 is transferred to the head core 103. The magnetic flux is leaked and the leaked magnetic flux is recorded on the tape. In the conventional VCR head 101, recording / reproducing current flows into one head core 103 during recording / reproducing. In this case, when one PCB 105 is used, a problem may occur in which mutual interference of precise signals may occur.

An object of the present invention for solving the above problems is to provide a high density VCR head having two PCBs in the head base, so that the recording signal flows into two head cores at the same time when recording, so that only one PCB is provided. Compared to less interference occurs to provide a device for removing noise.

1 is a diagram illustrating a partial configuration of a general VCR for explaining a process of recording and reproducing a conventional video signal.

Figure 2 is a conventional VCR head portion configuration diagram.

3 is a schematic overall block diagram of a VCR of the present invention;

4 is a conceptual diagram showing a principle of connection and driving of a head and a video tape when there are two heads of the present invention.

5 is an exemplary diagram for explaining a recording pattern in which data is stored in a video tape of the present invention.

Figure 6 is a VCR head portion configuration diagram of the present invention.

7 is an enlarged view of the head core portion of the present invention.

* Explanation of symbols for the main parts of the drawings *

11, 101: VCR (VTR) head 12, 102: head base

13, 103: head core 14, 104: coil

15, 105: PCB 16, 106: Record signal input terminal

In order to achieve the above object, a feature of the present invention is a VCR head in which a recording / reproducing signal or recording / reproducing current from a head core is directed to a PCB of a head base through a coil when recording / reproducing. High-density recording / reproducing, characterized in that the PCB to divide the existing PCB into two so that two different signals can enter / exit each of the two head cores attached to the recording / playback VCR head To provide a VCR head.

The overall configuration of the image recording / reproducing apparatus to which the image signal recording / reproducing technique is applied is as shown in FIG.

The image recording / reproducing apparatus (hereinafter, referred to as a VCR) shown in FIG. 3 includes a microcomputer 600 which generally controls the operation of the VCR by manipulation of the keypad 900C or the recocon 900B, and the microcomputer 600. A tuner 100 for receiving a broadcast signal of a channel selected by the tuner voltage output from the antenna ANT, an IF detector 200 for detecting an intermediate frequency from the broadcast signal received by the tuner 100, The recording unit 300 operates according to the operation control signal output to the microcomputer 600 and records the signal output from the IF detector 200 through the head H on the video tape (cassette) that is seated in the video technology. ) And a signal recorded on a video tape (cassette) seated on the video technology, which is operated according to an operation control signal output from the microcomputer 600 (generally recoil with respect to the recording unit 300). Access via (H) An output unit 400 for outputting, an OSD generator 700 for outputting a corresponding character image so as to receive text information output from the microcomputer 600, and output the image as an image; and the playback unit 400 It is composed of a large signal processing unit 800 for processing the output signal and the data output from the OSD generating unit 700 to transmit to the TV or CRT side.

A process of recording a television broadcast in a VCR will be described with reference to FIGS. 3 and 4.

4 is a conceptual diagram illustrating a connection principle and a driving principle of the head and the video tape when there are two heads. FIG. 5 is an exemplary diagram for describing a recording pattern in which data is stored on the video tape.

As shown in FIG. 4, the video tape rotates along the inclination angle of the inclined head, and one field of image data is stored in one track as shown in FIG.

Therefore, the present invention, as shown in Figs. 6 and 7, two different signals from the high-density recording VCR head 11 enters one PCB 14 through the coil 14, thereby precisely interfering with each other. In order to prevent the PCB from being separated into two, one PCB (15) to separate the existing PCB (15) into two so that each of the head core (13) can enter a separate signal, clean signal is eliminated Each head core 13 is delivered.

VCR head for recording / reproducing in the VCR head 11 in which recording / reproducing signal or recording / reproducing current from the head core 13 through the coil 14 is directed to the PCB 15 of the head base 12 during recording / reproducing. 11 is a PCB in which two different signals are divided into two PCBs so that independent signals can enter and exit each of the two head cores 13 attached to the recording / reproducing VCR head 11. 15) to remove the interference between each other so that a clean signal is transmitted to each head core (13).

The present invention, which operates as described above, enables accurate information storage by preventing interference of signals entering two head cores, and has an effect of reproducing a video signal capable of obtaining clean and clear image quality during recording and playback.

Although the present invention has been shown and described with respect to particular embodiments, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the accompanying Utility Model Claims. Anyone who owns it can easily find out.

Claims (1)

In the VCR head 11 in which the recording / reproducing signal or the recording / reproducing current from the head core 13 is directed to the PCB 15 of the head base 12 through the coil 14 at the time of recording / reproducing, The recording / reproducing VCR head 11 uses an existing PCB so that two different signals can enter / exit respectively from two head cores 13 attached to the recording / reproducing VCR head 11. A high density recording / reproducing VCR head comprising a PCB 15 for dividing into pieces.