CN1475075A

CN1475075A - CRT vibration and shock isolating apparatus

Info

Publication number: CN1475075A
Application number: CNA018189814A
Authority: CN
Inventors: 约瑟夫・A・里德; 约瑟夫·A·里德
Original assignee: Thomson Licensing SAS
Current assignee: Thomson Licensing SAS
Priority date: 2000-11-21
Filing date: 2001-11-08
Publication date: 2004-02-11
Also published as: AU2002227267A1; KR20040020043A; WO2002043380A2; JP3822566B2; JP2004515126A; WO2002043380A3

Abstract

An vibration isolation apparatus for mounting a CRT to a housing includes a base member with two resilient members mounted at diametrically opposite sides of the base member. The base member and the resilient members each have coaxial apertures for accepting a screw for securement to the housing, for minimizing the passage of vibrations from the housing to the CRT so that overall vibration transfer is reduced.

Description

CRT vibration and shock isolating apparatus

Technical field

The present invention relates to a kind of cathode ray tube (CRT) vibration and shock isolating apparatus, more specifically, relate at CRT model customization vibration and isolate installed module.

Background technology

The CRT capsule is evacuated to very low internal pressure value, and correspondingly, owing to the stress that atmospheric pressure produced and the impulsive force that act on the tube-surface, capsule might implosion.In the prior art, solve the problems referred to above by the implosion boundary belt is provided for CRT, this implosion boundary belt extends around the peripheral side wall of fluorescence panel (faceplate panel).This band is used for exerting pressure to the sidewall of CRT, so that the part power on the distribution fluorescence panel, and the shock-resistant ability of raising pipe, this is because the glass intensity of pressurized is higher than the glass intensity that is stretched, and this band causes producing in the fluorescence panel zone pressure, otherwise this zone will be stretched.

Mounting lug is used for pipe is fixing and be bearing in the casing (cabinet), and this mounting lug and implosion boundary belt one or be attached on the implosion boundary belt perhaps are stuck in band and manage between the sidewall.Typically, mounting lug is positioned at the bight place of pipe, and along the diagonal alignment of rectangular faceplate panel, certainly, the layout type of other known mounting lugs is arranged also.This mounting lug stretches out from band, and has installing hole or the groove that pipe is fixed to the bolt of using on the casing in order to hold within it usually.In case CRT is correctly alignd in casing, the hole that screw is passed in the lug is also fastening, thereby CRT is fixed to casing.

Color CRT uses the shadow mask on the inner surface that is suspended on fluorescence panel.This shadow mask can be exposed to the vibration of coupling shade mask structure mechanical resonance and/or harmonics/time harmonics.These vibrations mainly are to be caused by the sound that the loud speaker by also being installed in the casing in the casing is propagated.The resonance of this shadow mask frame structure will cause undesirable visual effect occurring on the CRT image, as microphony.In a very extreme example, shade mask structure can be caused color to generate dead zone (shodow) vibration of electron beam and shadow mask by vibration hundreds of micron, further causes producing on CRT undesirable visual effect, for example, and color fringe, aberration.So, wish to make the vibration minimum that is sent to CRT from casing through the CRT mounting structure.

In the prior art, various vibration alleviation/eliminations of known use or guard method are with the influence of protecting CRTs not vibrated.U.S. Patent No. 4651218 discloses a kind of method of present technology, wherein, uses the elastic caoutchouc packing ring that CRT and CRT mounting lug are isolated with the vibration that appears in CRT construction bolt and the casing.

But, because the size and dimension of shadow mask changes along with the variation of screen size and shape, so the CRTs of different screen size comprises that those have different aspect ratios, for example, and 4 * 3,16 * 9, have different shadow mask resonance.Hope like this, can be installed in the CRT of specific model in the different casings for the CRTs of each class provides CRT that hardware is installed, and need not to consider the concrete VIBRATION DESIGN of casing.In other words, hope will be installed hardware designs and be become to can be used in each CRT model, and need not to consider to install the casing of CRT.

Summary of the invention

The invention provides and a kind of CRT is installed to vibration isolating device on the shell.Base element has the high flexibility element of two shapings at the complete opposite side place that is installed in base element, has coaxial hole in these three elements.This base element is fixed to CRT.Described pore volume is received a long and narrow fixture, and for example bolt is used for module and CRT are fixed to casing.The high flexibility element and the base element of two shapings combine, and the vibration propagation from the shell to CRT is minimized.In one embodiment, the parameter of high flexibility element is chosen to combine with predetermined screw-driving moment the propagation of certain vibration frequency is minimized.

Description of drawings

Accompanying drawing shows the end view according to the partly cut-away of the CRT mounting structure of each side of the present invention.

Embodiment

Usually, the securing member that inserts by each hole by means of four mounting lug utilizations with hole of cathode ray tube (CRT) is installed on casing or the shell.Usually, mounting lug is positioned at the bight place of pipe, and along the diagonal alignment of rectangular panel.This structure is known in the prior art.

With reference to accompanying drawing, CRT10 is provided with implosive band 12, and as mentioned above, this band has mounting lug fixed thereon 14.It is porose 16 that lug 14 is provided with, in order to hold cylindrical base element 18 regularly.The complete

opposite side

20,22 of base element 18 is provided with recess 24, and each recess has elastic component 26a, the 26b that is arranged in it.Base element 18 and each

element

26a and 26b have coaxial cylindrical hole 28, and set bolt 30 passes this hole CRT is fixed on frame/shell 32.Packing ring 34 is arranged between bolt head 36 and the element 26a around bolt 30 with one heart.Second packing ring 37 is arranged between element 26a and the shell 32 and contact with it around bolt 30 with one heart.

Element

26a and 26b are made by the elastomeric resilient material, for example, and neoprene, PVC.The hardness of

element

26a and 26b is chosen to have predetermined impact hardness (dynamic stiffness), and this hardness can be alleviated vibration and impact dynamic G power when pressurized.As shown in the figure,

element

26a and 26b are hemisphere, and be nested in tightly respectively in the corresponding recess 24, but, in design of the present invention, can use reducing of vibration frequency that other shapes obtain to wish, for example, conical, cylindrical etc., and these two element 26a need not be identical shape, size or impact hardness with 26b.The screw-down torque decision element 26a of screw 30 and the decrement of 26b, and the table meter hardness of

element

26a and 26b, shape and size are chosen to adjust this system and propagate into CRT10 with the frequency that prevents to be harmful to from casing/shell 32, for soft-tension flat-screen CRT model, typical correlated frequency (frequency ofinterest) at 80Hz in the scope of 90Hz, and can be higher for traditional shadow mask CRT.

Gap 38 between

packing ring

34,37 and base element 18, the shell/casing 32 guarantees that respectively vibrational energy must pass elastic component before contact tube, but this gap is limited to an impact impedance along the longitudinal axis of CRT in z-plane is provided.So disclosed vibration isolating device will limit undesirable frequency, disperse vibration energy and some surge protections will be provided.

Can base element 18 be fixed in the hole 16 of mounting lug 14 by several different methods, for example, welding, interference fit, the external diameter of the size in hole 16 and base element 18 closely cooperates, like this, when base element 18 is frozen, the thermal expansion of base element 18 will be locked at base element 18 on the lug 14 at ambient temperature, perhaps, the external diameter of base element 18 has screw thread, and the axial length of pair of locking nut along base element 18 is screwed on the base element 18, and at the fastening (not shown) in the both sides of lug 14.

In addition, this disclosed base element module 18 and

elastic component

26a and 26b can utilize the screw-down torque of bolt 30 to be determined at the characteristic of specific CRT, therefore, this module can be used for various casing/frames, and is not subjected to the influence of the vibration characteristics of casing/frame.

Claims

One kind be used for CRT supporting and navigate on the shell and will manage and shell in the isolated device of vibration that exists, comprising:

The module that comprises base element;

Shaped resilient device on a pair of complete opposite side that is installed in base element;

Base element and this all have coaxial aperture in the shaped resilient device each, in order to hold module are fixed on long and narrow fixture on the shell; And

Be used for CRT is fixed to device on the base element;

Can be separately or in conjunction with shape, size and the elastic parameter of selecting elastic device, so that reduce vibration from the transmission of shell to CRT.
2. device as claimed in claim 1, wherein, can be at concrete CRT model, shape, size or the elastic parameter of elastic device selected in independent or combination.
3. device as claimed in claim 1, wherein, can be at concrete vibration frequency, shape, size or the elastic parameter of elastic device selected in independent or combination.
4. device as claimed in claim 1, wherein, this shape to elastic device, size or elastic parameter can differ from one another.
5. device as claimed in claim 1, wherein, the shape of elastic device is a hemisphere.
One kind be used for CRT supporting and navigate on the shell and will manage and shell in the isolated device of vibration that exists, comprising:

The module that comprises base element;

On a pair of complete opposite side that is installed in base element, in order to reduce vibration from the shaped resilient device of shell to the propagation of CRT;

Base element and this all have coaxial aperture in the shaped resilient device each, in order to hold module are fixed on long and narrow fixture on the shell; And

Be used for CRT is fixed to device on the base element.
7. device as claimed in claim 6, wherein, can be separately or in conjunction with shape, size or the elastic parameter of selecting elastic device, so that reduce selected vibration frequency from the propagation of shell to CRT.
8. device as claimed in claim 6, wherein, the shape of elastic device is a hemisphere.
9. vibration isolating device, be used for CRT is installed in shell, this device comprises base element, and this base element has two elastic components that are installed in the complete opposite side place of base element, have coaxial aperture in base element and the elastic component, propagate to CRT from shell in order to reduce vibration.
10. CRT, it has in order to CRT is installed to the acoustics spacer assembly on the shell, this spacer assembly comprises base element, this base element has two elastic components that are installed in the complete opposite side place of base element, have coaxial aperture in base element and the elastic component, propagate to CRT from shell in order to reduce vibration.
11. video display apparatus, it has in order to CRR is installed to the acoustics spacer assembly on the shell, this spacer assembly comprises base element, this base element has two elastic components that are installed in the complete opposite side place of base element, have coaxial aperture in base element and the elastic component, propagate to CRR from shell in order to reduce vibration.