KR0132479B1 - Bearing for head drum of vcr - Google Patents

Bearing for head drum of vcr

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Publication number
KR0132479B1
KR0132479B1 KR1019940033130A KR19940033130A KR0132479B1 KR 0132479 B1 KR0132479 B1 KR 0132479B1 KR 1019940033130 A KR1019940033130 A KR 1019940033130A KR 19940033130 A KR19940033130 A KR 19940033130A KR 0132479 B1 KR0132479 B1 KR 0132479B1
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KR
South Korea
Prior art keywords
shaft
head drum
carbon film
dynamic pressure
bearing
Prior art date
Application number
KR1019940033130A
Other languages
Korean (ko)
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KR960025336A (en
Inventor
손태익
Original Assignee
이헌조
엘지전자주식회사
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Application filed by 이헌조, 엘지전자주식회사 filed Critical 이헌조
Priority to KR1019940033130A priority Critical patent/KR0132479B1/en
Publication of KR960025336A publication Critical patent/KR960025336A/en
Application granted granted Critical
Publication of KR0132479B1 publication Critical patent/KR0132479B1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/043—Sliding surface consisting mainly of ceramics, cermets or hard carbon, e.g. diamond like carbon [DLC]
    • 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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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sliding-Contact Bearings (AREA)

Abstract

Disclosed is a dynamic pressure bearing for a head drum of a video cassette recorder which rotates while making contact with a tape and records or reproduces an image signal and an sound signal onto/from the tape. According to the present invention, a carbon film(13) is formed at least one of an outer surface of a shaft(11) around which the head drum is fixedly installed and an inner surface of a sleeve(12) which is coupled with shaft(11) so as to guide the rotation of shaft(11). The frictional coefficient is reduced by the carbon film so that the life span extends and the start torque is reduced.DYNAMIC PRESSURE BEARING FOR A HEAD DRUM OF A VIDEO CASSETTE RECORDERDisclosed is a dynamic pressure bearing for a head drum of a video cassette recorder which rotates while making contact with a tape and records or reproduces an image signal and an sound signal onto/from the tape. According to the present invention, a carbon film(13) is formed at least one of an outer surface of a shaft(11) around which the head drum is fixedly installed and an inner surface of a sleeve(12) which is coupled with shaft(11) so as to guide the rotation of shaft(11). The frictional coefficient is reduced by the carbon film so that the life span extends and the start torque is reduced.

Description

비디오카세트 레코오더의 헤드드럼용 동압베어링Dynamic Bearings for Head Drums of Videocassette Recorders

제1도는 종래의 트러스트베어링을 나타낸 종단면도.1 is a longitudinal sectional view showing a conventional trust bearing.

a도는 피봇형태의 트러스트베어링을 나타낸 종단면도.a is a longitudinal sectional view showing a pivot bearing of a thrust bearing;

b도는 스타이럴 그루브형태의 트러스트베어링을 나타낸 종단면도.b is a longitudinal cross-sectional view showing a axial groove-type thrust bearing;

제2도는 본 발명의 동압베어링을 나타낸 종단면도.2 is a longitudinal sectional view showing a dynamic bearing of the present invention.

제3도는 다이아몬드상 카본박막을 형성하기 위한 이온 플레이팅장비의 구성도.3 is a block diagram of an ion plating apparatus for forming a diamond-like carbon thin film.

제4도는 본 발명의 동압베어링을 사용시 구동모터의 소비전력을 종래와 비교하여 나타낸 그래프.Figure 4 is a graph showing the power consumption of the drive motor compared with the conventional when using the dynamic pressure bearing of the present invention.

제5도는 동압베어링의 측에 발생되는 스크래치정도를 종래와 비교하여 나타낸 그래프5 is a graph showing the degree of scratches generated on the side of the dynamic bearing in comparison with the conventional art

제6도는 축의 회전속도변화율을 종래와 비교하여 나타낸 그래프.Figure 6 is a graph showing the rate of change of rotational speed of the shaft compared to the prior art.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

11 : 축 12 : 슬리브11: shaft 12: sleeve

13 : 다이아몬드상 카본필름13: diamond-like carbon film

본 발명은 비디오카세트레코오더(VCR)에서 테이프와 접속 회전하면서 테이프에 화상 및 음성신호를 기록하거나, 재생하는 헤드드럼의 회전시 헤드드럼의 회전을 가이드하는 동압베어링에 관한 것이다. 일반적으로 자기기록장치인 비디오카세트레코오더는 로딩된 테이프카세트로 부터 이동가이드에 의해 테이프를 인출하여 헤드드럼에 감은 상태로 테이프를 주행시키면서 상기 헤드드럼에 고정된 자기헤드에 의해 테이프에 화상 및 음성신호를 기록하거나, 재생하게 된다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic pressure bearing for guiding rotation of a head drum during rotation of a head drum for recording or reproducing image and audio signals on a tape while rotating rotation with a tape in a video cassette recorder (VCR). In general, a video cassette recorder, which is a magnetic recording device, draws a tape from a loaded tape cassette by a moving guide and moves the tape in a state in which it is wound on a head drum while the video and audio are recorded on the tape by a magnetic head fixed to the head drum. The signal is recorded or reproduced.

종래의 헤드드럼에 적용되는 동압베어링은 제1도와 같은 형태로써, 헤드드럼(도시는 생략함)의 회전시 축(1)이 동압에 의해 상측으로 부상하여 트러스트판(2)과 접속된 상태로 회전되므로 볼베어링에 비해, 동작시 소음 및 마모가 적으며 회전속도가 클수록 동압이 커지게 되므로 고속회전에 유리하게 된다.The dynamic pressure bearing applied to the conventional head drum is the same as that shown in FIG. 1, in which the shaft 1 rises upward due to dynamic pressure and is connected to the thrust plate 2 when the head drum (not shown) is rotated. As it rotates, noise and wear are less during operation, and the greater the rotation speed, the greater the dynamic pressure, which is advantageous for high speed rotation.

그러나 이러한 종래의 동압베어링은 축이 회전될 때 축의 정확한 중심에서 회전되지 못하고 유막압력의 변동에 따라 축의 중심이 변동되므로 축이 슬리브(3)의 일측면에 직접 당하 타서 붙는 경우가 발생되었음은 무론 축중심의 변동에 따라 테이프와의 접속력이 달라져 테이프의 수명을 저하시키게 된다.However, such a conventional dynamic bearing does not rotate at the exact center of the shaft when the shaft is rotated, and the center of the shaft is changed by the variation of the oil film pressure. Therefore, the shaft is directly attached to one side of the sleeve 3 to be attached. The change in the center of the shaft changes the connection force with the tape, which reduces the life of the tape.

또하나 축의 초기 정지시의 동압이 충분치 못하여 축과 슬리브가 직접 닿게 되므로 마모가 심해 수명을 단축시키게 되는데, 특히(a)와 같은 피봇타입의 경우에는 마모 및 마찰열이 더욱 심하게 발생된다.In addition, the dynamic pressure at the initial stop of the shaft is not enough to directly contact the shaft and the sleeve, the wear is severe to shorten the life, especially in the case of a pivot type such as (a) is more severe wear and friction heat is generated.

본 발명은 종래의 이와 같은 문제점을 해결하기 위해 안출한 것으로써, 헤드드럼의 회전시는 물론 초기 구동 및 정지시 축과 슬리브사이에서 발생되는 동압을 저감시켜 동압베어링의 수명이 연장되도록함과 동시에 축의 회전에 따른 부하를 출이도록 하는데 그 목적이 있다.The present invention has been made to solve such a problem in the prior art, while reducing the dynamic pressure generated between the shaft and the sleeve when the head drum is rotated as well as during the initial driving and stopping, so as to extend the life of the dynamic bearing. The purpose is to release the load according to the rotation of the shaft.

상기 목적을 달성하기 위한 본 발명의 형태에 따르면, 헤드드럼이 고정되는 축의 외면과 상기 축이 결합되어 축의 호전을 안내하는 슬리브의 내면중 어느 일면에 다이아몬드상 카본필름이 형성된 동압베어링이 제공된다.According to an aspect of the present invention for achieving the above object, there is provided a dynamic pressure bearing in which a diamond-like carbon film is formed on any one of the outer surface of the shaft to which the head drum is fixed and the inner surface of the sleeve to which the shaft is coupled to guide the improvement of the shaft.

이하, 본 발명을 일 실시예로 도시한 첨부된 도면 제2도 내지 제5도를 참고로 하여 더욱 상세히 설명하면 다음과 같다.Hereinafter, the present invention will be described in more detail with reference to FIGS. 2 through 5 of the accompanying drawings.

첨부도면 제2도는 본 발명의 동압베어링을 나타낸 종단면도이고 제3도는 다이아몬드상 카본박막을 형성하기 위한 이온 플레이팅장비의 구성도로써, 본 발명은 헤드드럼이 고정되는 축(11)의 외면이나, 상기 축이 삽입되어 회전시 안내하는 슬리브(12)의 내면중 어느 일면에 다이아몬드상 카본필름(DLC : Diamond Like Carbon)(13)을 형성한다.FIG. 2 is a longitudinal sectional view showing a dynamic bearing of the present invention, and FIG. 3 is a schematic view of an ion plating apparatus for forming a diamond-like carbon thin film. The present invention relates to an outer surface of a shaft 11 on which a head drum is fixed. In addition, the shaft is inserted to form a diamond-like carbon film (DLC: Diamond Like Carbon) 13 on any one of the inner surface of the sleeve 12 to guide when rotating.

상기 다이아몬드상 카본필름(13)을 형성하는 방법은 여러가지 방법이 알려쳐 있으나, 제3도에 도시한 바와 같은 이온 플레이팅장비를 이용하여 형성한다.Various methods are known for forming the diamond-like carbon film 13, but are formed using an ion plating apparatus as shown in FIG.

그러나 반드시 이에 국한 하는 것은 아니고 이온빔 증착법, rf-PACVD법, ECR방전을 이용한 합성법, 스퍼터링 합성법, 레이저 에이브레이션에 의한 합성법등을 이용하여 다이아몬드상 카본필름(13)을 형성할 수도 있다.However, the diamond-like carbon film 13 may be formed using, but not necessarily limited to, ion beam deposition, rf-PACVD, synthesis using ECR discharge, sputtering synthesis, synthesis by laser ablation, and the like.

상기 이온 플레이팅장비를 이용하여 다이아몬드상 카본필름(13)을 형성하는 과정은 플라즈마의 글로우방전(Glow Discharge)영역에서 생성된 이온들이 기판상에 형성되는 플라즈마쉴드에 의해 기판으로 가속되도록 하여 다이아몬드상 카본필름을 형성한다.The process of forming the diamond-like carbon film 13 by using the ion plating equipment causes the ions generated in the glow discharge region of the plasma to be accelerated to the substrate by a plasma shield formed on the substrate. A carbon film is formed.

이때 플라즈마발생 전원으로는 드물게 DC가 사용되기도 하지만, 합성되는 다이아몬드상 카본필름(13)이 절연체이므로 수십 KHz에서 수 KHz대의 고주파전원을 사용한다.At this time, DC is rarely used as a plasma generating power, but since the synthesized diamond-like carbon film 13 is an insulator, a high frequency power of several tens of KHz to several KHz is used.

또한 기판에서 형성되는 자기 바이어스(Self bias)를 이온의 가속에 이용하여 높은 에너지의 이온을 얻을 수 있는 정전결합(Capacitive coupling)을 많이 사용한다.In addition, the self bias formed in the substrate is used to accelerate the ions, and a lot of capacitive coupling is used to obtain high energy ions.

이와 같이 얻어지는 다이아몬드상 카본필름(13)은 코팅되는 물체의 재질에 구애받지 않고 비정질 준 안정상태로 표면이 수백 A미만의 평활도를 갖는다. 이에 따라 다이아몬드상 카본피름(13)은 다이아몬드와 유사한 경도 및 내마모성, 윤활성, 전기절연성, 화학적안정성을 갖는다.The diamond-like carbon film 13 thus obtained has a smoothness of less than several hundred A in an amorphous quasi-stable state regardless of the material of the object to be coated. Accordingly, the diamond-like carbon film 13 has hardness and wear resistance, lubricity, electrical insulation, and chemical stability similar to diamond.

상기 축(11)의 외면과 슬리브(12)의 내면중 어느 일면에 형성되는 다이아몬드상 카본필름(13)의 두께는 0.05μm 이상으로 하는 것이 바람직하다.The thickness of the diamond-like carbon film 13 formed on one of the outer surface of the shaft 11 and the inner surface of the sleeve 12 is preferably 0.05 μm or more.

이는 헤드드럼의 크기 및 회전조건에 따라 다소 차이가 있으나, 약 1,000시간 정도를 회전시켰을 때 0.05μm∼0.08μm정도 마모가 발생되므로 실용상 충분한 수명을 얻을 수 있도록 하기 위함이다.This is somewhat different depending on the size and rotational conditions of the head drum, but because the wear occurs about 0.05μ ~ 0.08μm when rotated about 1,000 hours to obtain a sufficient life in practical use.

본 발명이 적용된 동압베어링과 종래의 동압베어링을 축의 회전속도 : 1,800rpm, 모터의 구동전압 : 2.1V(일정)으로 실험하여 그 결과를 제4도 내지 제6도에 나타내었다.The dynamic pressure bearing to which the present invention was applied and the conventional dynamic pressure bearing were experimented with the rotational speed of the shaft at 1,800 rpm and the driving voltage of the motor at 2.1 V (constant), and the results are shown in FIGS. 4 to 6.

첨부도면 제4도는 본 발명의 동압베어링을 사용시 구동모터의 소비전력을 종래와 비교하여 나타낸 그래프로써, 모터의 소비전류는 축(11)을 회전시키는데 작용되는 부하와 비례한다.4 is a graph showing the power consumption of the drive motor in comparison with the prior art when using the dynamic pressure bearing of the present invention, wherein the current consumption of the motor is proportional to the load acting on rotating the shaft 11.

이러한 부하는 마모에 의한 것과, 동압발생의 조건(축과 슬리브의 표면조도등)에 의존하므로 본 발명의 동압베어링과 종래의 동압베어링을 적용하여 100시간 동작 시켰을 때 본 발명이 적용된 동압베어링의 사용에 따른 모터의 소비전력은 14mA인 반명, 종래 동압베어링의 사용에 따른 소비전력은 20mA이므로 결국 본 발명의 동압베어링을 사용할 헤드드럼의 구동시 작용되는 부하가 종래의 동압베어링을 사용하던 헤드드럼에 비해 훨씬 적음을 알 수 있다.Since the load depends on wear and conditions of dynamic pressure generation (surface roughness of shaft and sleeve, etc.), the use of the dynamic pressure bearing to which the present invention is applied when the dynamic pressure bearing of the present invention and the conventional dynamic bearing are operated for 100 hours. The power consumption of the motor is 14mA, but the power consumption according to the use of the conventional dynamic bearing is 20mA, so that the load acted upon driving the head drum to use the dynamic bearing of the present invention is applied to the head drum using the conventional dynamic bearing. It can be seen that much less.

제5도는 동압베어링의 축에 발생되는 스크래치정도를 종래와 비교하여 나타낸 그래프로써 스크래치(scratch)의 발생을 확실히 비교하기 위해 매 5시간마다 축(11)의 회전을 중단시킨 다음 다시 회전시키는 것을 반복하여 실험한 것이다.5 is a graph showing the degree of scratches generated on the shaft of the hydrodynamic bearing as compared with the conventional one, in which the rotation of the shaft 11 is stopped and then rotated again every 5 hours in order to reliably compare the occurrence of scratches. It was an experiment.

이는 축(11)이 초기 회전될 때와 정지시에는 동압발생이 것의 없는 상태이므로 축(11)의 외면과 슬리브(12)의 내면이 직접 접촉되어 스크래치를 유발하기 때문이다.This is because the outer surface of the shaft 11 and the inner surface of the sleeve 12 are in direct contact with each other and cause scratches when the shaft 11 is initially rotated and at the stop.

상기한 바와 같이 축(11)에 발생되는 스크래치를 비교하므로써 축의 내마모성을 알 수 있게 되는데, 본 발명의 동압베어링은 다이아몬드상 카본필름(13)에 의해 축(11)이 마모량이 거의 없으나, 종래의 동압베어링은 50∼80시간사이에서 축의 마모가 급격히 발생됨을 알 수 있다.As described above, it is possible to know abrasion resistance of the shaft by comparing the scratches generated on the shaft 11. In the dynamic pressure bearing of the present invention, the shaft 11 is hardly worn by the diamond-like carbon film 13, It can be seen that the dynamic pressure bearing suddenly wears off the shaft between 50 and 80 hours.

제6도는 축의 회전속도변화율을 종래와 비교하여 나타낸 그래프로써, 본 발명이 적용된 축(11)은 마모량과 마찰계수가 적어 회전속도 변화량이 거의 균일하여 축이 안정되게 회전됨을 알 수 있으나, 종래 축의 회전속도는 시간이 경과됨에 따라 축의 마모량이 증가되므로 매우 불안정한 상태에서 회전됨을 알 수 있다.Figure 6 is a graph showing the rotational speed change rate of the shaft compared to the prior art, the shaft 11 to which the present invention is applied has a small amount of wear and friction coefficient it can be seen that the rotational speed change is almost uniform, so that the shaft rotates stably, It can be seen that the rotation speed is rotated in a very unstable state because the wear amount of the shaft increases with time.

또한, 축(11)과 슬리브(12)사이의 마찰계수가 종래의 동압베어링은 0.03인데 반해, 본 발명이 적용된 동압베어링은 마찰저항의 저하로 인해 0.018정도로 낮아져 이둘 사이에서 작용되는 면암이 커지게 되고, 이에 따라 초기 회전과, 회전의 중단시 쉽게 슬립(Slip)이 발생되므로 내마모성이 양호해지게 됨은 물론 기동코크가 작아지게 된다.In addition, the conventional coefficient of friction between the shaft 11 and the sleeve 12 is 0.03, whereas the dynamic bearing of the present invention is lowered to about 0.018 due to a decrease in frictional resistance, thereby increasing the surface arm acting between the two. Accordingly, since the slip is easily generated during the initial rotation and the stop of the rotation, the wear resistance becomes good and the starting cock becomes smaller.

이상에서와 같이 본 발명은 축과 슬리브의 어느 일면에 다이아몬드상 카본필름이 형성되어 있어 마찰계수가 적어져 내마모성이 증대되므로 수명을 연장시킴은 물론 기동토크를 줄이게 되며, 면압의 상승으로 피로강도 및 강성이 향상되는 효과를 얻게 된다.As described above, according to the present invention, diamond-like carbon film is formed on one surface of the shaft and the sleeve, so that the friction coefficient decreases, thereby increasing the wear resistance, thereby prolonging the service life and reducing the starting torque. The effect of improving the rigidity is obtained.

Claims (1)

헤드드럼이 고정되는 축의 외면과, 사익 축이 결합되어 축의 회전을 안내하는 슬리브의 내면둥 어느 일면에 다이아몬드상 카본필름이 형성됨을 특징으로 하는 비디오카세트레코오더의 헤드드럼용 동압베어링.A dynamic pressure bearing for a head drum of a video cassette recorder, characterized in that a diamond-like carbon film is formed on one surface of an inner surface of a sleeve to which the head drum is fixed and the blade shaft is coupled to guide the rotation of the shaft.
KR1019940033130A 1994-12-07 1994-12-07 Bearing for head drum of vcr KR0132479B1 (en)

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KR1019940033130A KR0132479B1 (en) 1994-12-07 1994-12-07 Bearing for head drum of vcr

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KR1019940033130A KR0132479B1 (en) 1994-12-07 1994-12-07 Bearing for head drum of vcr

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KR0132479B1 true KR0132479B1 (en) 1998-04-18

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