KR920000854Y1 - Resonance faulty removal device for vtr head drum - Google Patents
Resonance faulty removal device for vtr head drum Download PDFInfo
- Publication number
- KR920000854Y1 KR920000854Y1 KR2019880020297U KR880020297U KR920000854Y1 KR 920000854 Y1 KR920000854 Y1 KR 920000854Y1 KR 2019880020297 U KR2019880020297 U KR 2019880020297U KR 880020297 U KR880020297 U KR 880020297U KR 920000854 Y1 KR920000854 Y1 KR 920000854Y1
- Authority
- KR
- South Korea
- Prior art keywords
- drum
- head drum
- resonance
- head
- removal device
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/52—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with simultaneous movement of head and record carrier, e.g. rotation of head
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
- G11B15/60—Guiding record carrier
- G11B15/61—Guiding record carrier on drum, e.g. drum containing rotating heads
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
- G11B33/08—Insulation or absorption of undesired vibrations or sounds
Landscapes
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
내용 없음.No content.
Description
제1도는 본 고안의 측면도.1 is a side view of the present invention.
제2도는 본 고안의 평면도.2 is a plan view of the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for the main parts of the drawings
2 : 상부드럼 3 : 하부드럼2: upper drum 3: lower drum
4 : 헤드드럼 5 : 소프트브레이크4: Head drum 5: Soft brake
9 : 펠트층9: felt layer
본 고안은 VTR의 헤드드럼에 있어서 헤드드럼의 공진불량을 제거하기 위한 구조에 관한 것으로 특히, 헤드드럼 측면에 위치한 메인베이스 기둥에 소프트브레이크를 장착하여 상부드럼과 접촉케하므로서 헤드드럼의 비틀림 공진진동수를 변화시켜 고유의 진동수를 갖게 하는 공진제거 불량구조에 관한 것이다.The present invention relates to a structure for removing the resonance failure of the head drum in the head drum of the VTR. In particular, a soft brake is mounted on the main base column located on the side of the head drum to make contact with the upper drum. The present invention relates to a resonance cancellation failure structure in which a frequency is changed to have an inherent frequency.
일반적으로 헤드드럼은 샤프트에 관통되어 상측으로 비디오헤드가 부착회전되는 상부드럼계와 하측으로 모타의 회전자계가 있는 하부드럼계 그리고 예압보스로 구성되어 지는데, 이러한 헤드드럼은 각 부품의 치수형상, 재질의 비중 및 질량 분포상태등에 따라 헤드드럼의 고유 비틀림 진동수가 결정되며, 상부 드럼이 회전함에 따라 2개의 비디오 헤드가 테이프면에 고속으로 접촉주행하면서 주기적인 충동펄스를 받게 되는바, 이때 헤드드럼 고유의 비틀림 진동수가 충동펄스의 정수배가 되는 경우 헤드드럼의 공진현상이 발생하여 재생화면상에 지터(Jitter)등을 발생케하는 원인이 되었다.In general, the head drum is composed of an upper drum system through which the video head is attached and rotated upwards, a lower drum system with a motor magnetic field downward, and a preload boss. The specific torsional frequency of the head drum is determined according to the specific gravity and mass distribution of the material.As the upper drum rotates, the two video heads are subjected to periodic impulse pulses while contacting the tape surface at high speed. When the inherent torsional frequency becomes an integer multiple of the impulse pulse, resonance of the head drum occurs, which causes jitter and the like on the playback screen.
따라서, 종래에는 이러한 점을 고려하여 헤드드럼의 설계시 충동펄스의 정수배와 정수배의 중간에 고유비틀림 진동수가 위치하도록 설게를 하게되나, 물성치 등의 변화, 조립상태에 따라 주파수의 변동이 나타나게 되므로, 공진현상을 완벽하게 제거하기란 매우 어려웠다.Therefore, in the related art, in the design of the head drum, the inherent torsional frequency is located in the middle of the integral and constant multiples of the impulse pulse, but the frequency changes depending on the change in physical properties and assembly state. It was very difficult to completely eliminate the resonance.
또다른 방법으로는 공진현상이 나타나는 헤드드럼의 타측에 원판을 붙여 관성모멘트를 증가시킨다든가 하여 일정주파수 만큼 주파수를 이동시키게도 하였으나, 헤드드럼 충돌펄스의 주파수는 TV방식에 따라 다르고 또 재생시와 특수재생시 등 각 모드에 있어서도 다르기 때문에, 이 역시 완전한 해결이 어려운 문제점이 있었다.Another method is to increase the moment of inertia by attaching a disc on the other side of the head drum where resonance occurs, but to move the frequency by a certain frequency.However, the frequency of the head drum collision pulse varies depending on the TV system. Since there is a difference in each mode, such as during playback, this also has a problem that complete solution is difficult.
본 고안의 목적은 이러한 문제점을 해결하려는 것으로서, 소프트브레이크를 이용하여 헤드드럼의 비틀림 공진주파수를 낮추게 하되, 헤드드럼에 대한 브레이크의 위치를 임의로 조절하여 관성 모멘트에 의한 변화 또는 주파수 이동량의 변화를 적정값으로 조절가능케 한 VTR헤드드럼의 공진제거 불량구조를 제공하고자 하는 것으로, 첨부된 도면과 관련하여 상세히 설명하면 다음과 같다.The purpose of the present invention is to solve such a problem, by using a soft brake to lower the torsional resonant frequency of the head drum, and arbitrarily adjust the position of the brake relative to the head drum to adjust the change by the moment of inertia or the change in the frequency shift To provide a resonance cancellation failure structure of the VTR head drum that is adjustable by the value, it will be described in detail with reference to the accompanying drawings.
샤프트(1)에 관통되어 상부드럼(2)과 하부드럼(3)으로 분할형성되는 헤드드럼 (4)에 있어서 상부드럼(2)의 상면에 소프트브레이크(5)를 접촉케하고 소프트브레이크 (5)는 데크(도시안됨)상의 메인베이스 기둥(6)에 일측의 장공(7)을 통해서 나사(8)에 의해 체결되어 지며, 소프트브레이크(5)의 타측 즉, 상부드럼(2)의 상면과 접촉되는 부위는 펠트층(9)이 부착된다.In the head drum 4 penetrating the shaft 1 and divided into the upper drum 2 and the lower drum 3, the soft brake 5 is brought into contact with the upper surface of the upper drum 2 and the soft brake 5 ) Is fastened to the main base column 6 on the deck (not shown) by the screw 8 through the long hole 7 on one side, and the other side of the soft brake 5, that is, the upper surface of the upper drum (2) The felt layer 9 is attached to the site of contact.
미설명 부호(10)은 비디오헤드이다.Reference numeral 10 is a video head.
위와같이 구성된 본 고안은 상부드럼(2)에 취부된 2개의 비디오헤드(10)가 테이프와 고속으로 접촉주행시 일정한 시간 간격으로 주기적인 충격을 발생케 되는데, 이때 발생되는 것이 충돌펄스이며, 이러한 충돌펄스가 가진력으로 작용하는 비틀림진동 (Torsional bivration)을 소프트브레이크(5)로 조절하는데, 소프트브레이크(5)와 상부드럼(2)의 접촉면적은 제2도에서와 같이 소프트브레이트(5)의 장공(7)을 이동시켜 나사(8)로 메인베이스 기둥(6)에 체결하여 임의 조절이 가능하게 되므로, 상부드럼(2)의 상부면에 대한 소프트브레이크(5)의 펠트층(9)의 접촉량에 따라 각기 다른 브레이크력이 상부드럼(2)에 가해져서 드럼진동의 수정조절이 가능하게 된다.According to the present invention, the two video heads 10 mounted on the upper drum 2 generate periodic shocks at regular time intervals when the tape drives at high speed. The collision pulses are generated at this time. The torsional vibration, which acts as the excitation force of the pulse, is controlled by the soft brake 5, and the contact area between the soft brake 5 and the upper drum 2 is the long hole of the soft brake 5 as shown in FIG. (7) is moved to the main base column (6) with screws (8), so that arbitrary adjustment is possible, so that the felt layer (9) of the soft brake (5) to the upper surface of the upper drum (2) Different brake force is applied to the upper drum 2 according to the amount, so that the correction of the drum vibration is possible.
소프트브레이크(5)의 타측에 부착된 부드러운 펠트층(9)이 상부드럼(2)의 상부면에 접촉되므로, 상부드럼(2)의 표면에는 아무런 손상을 입히지 않게 된다.Since the soft felt layer 9 attached to the other side of the soft brake 5 is in contact with the upper surface of the upper drum 2, the surface of the upper drum 2 is not damaged.
이상과 같은 본 고안은 보다 간결한 방법에 의하여 헤드드럼의 비틀림 공진주파수를 적절한 값으로 조절하여, 헤드드럼이 고유 진동수를 갖게 하므로서 공진 불량을 제거시켜 헤드드럼의 기능을 향상되게 하며 이에 따른 제품의 품질 또한 향상되므로 소비자에게 신뢰성을 심어주는등 효과가 있다.The present invention as described above, by adjusting the torsional resonant frequency of the head drum to a proper value by a more concise method, the head drum has a natural frequency to eliminate the resonance failure to improve the function of the head drum and accordingly the product quality In addition, it is effective because it improves the reliability to consumers.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880020297U KR920000854Y1 (en) | 1988-12-09 | 1988-12-09 | Resonance faulty removal device for vtr head drum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019880020297U KR920000854Y1 (en) | 1988-12-09 | 1988-12-09 | Resonance faulty removal device for vtr head drum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR900013015U KR900013015U (en) | 1990-07-04 |
| KR920000854Y1 true KR920000854Y1 (en) | 1992-01-31 |
Family
ID=19281987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019880020297U KR920000854Y1 (en) | 1988-12-09 | 1988-12-09 | Resonance faulty removal device for vtr head drum |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR920000854Y1 (en) |
-
1988
- 1988-12-09 KR KR2019880020297U patent/KR920000854Y1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR900013015U (en) | 1990-07-04 |
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