JP3822566B2 - Device for separating a cathode ray tube from vibrations present in a housing - Google Patents

Description

[0001]
(Industrial application fields)
The present invention relates to a vibration and shock separation device for a cathode ray tube (CRT, CRT), and more particularly, to adapt a vibration isolation mounting module to a cathode ray tube (CRT) model. About that.
[0002]
(Background of the Invention)
The cathode ray tube (CRT) envelope is evacuated to a very low internal pressure, and therefore the stress produced by the atmospheric pressure acting on the surface of the cathode ray tube, and the impact force (impact force). ) May cause implosion (implosion). In the art, this problem has been addressed by providing the CRT with an explosion protection band that extends around the outer peripheral side wall of the faceplate panel. Such a band is used to apply pressure to the side walls of the CRT to redistribute some of the force on the faceplate panel and increase the impact resistance of the cathode ray tube. This is because glass under pressure is stronger than glass under tension, and the band causes pressure in the faceplate panel area where it is normally tensioned.
[0003]
A mounting lug is used to secure and support the cathode ray tube in the cabinet. The attachment lug may be integral with the explosion-proof band, may be attached to the explosion-proof band, or may be fitted between the band and the side wall of the cathode ray tube. Typically, the mounting lugs are located at the corners of the cathode ray tube and along the diagonal of the rectangular faceplate panel, although other mounting lug arrangements are known. The mounting lug extends out of the band and typically has a mounting aperture or slot to receive a screw for securing the cathode ray tube to the cabinet. After properly aligning the CRT in the cabinet, place the screws into the mounting lug holes and tighten to allow the CRT to be securely attached to the cabinet.
[0004]
The color CRT uses a shadow mask that hangs over the inner surface of the faceplate panel. This shadow mask may experience vibrations that match the mechanical resonance frequency and / or harmonic frequency / subharmonic frequency of the mask structure. These vibrations are mainly caused by sound propagated in the cabinet by speakers that are also attached to the cabinet and are in the cabinet. Such resonance of the mask frame structure will cause unwanted visual effects, such as microphonics, on the CRT screen. In the extreme case, the shadow mask structure vibrates hundreds of micrometers, shaking the color generating electron beam and the shadow mask shadow, and further undesirable visual effects such as color banding on the CRT. Color irregularities) and chromatic aberration. Therefore, it is desirable to minimize vibrations that are propagated from the cabinet to the CRT through the CRT mounting structure.
[0005]
It is well known in the art to use various types of vibration reduction / removal or prevention methods to protect the CRT from vibration. One such prior art approach is described in US Pat. No. 4,651,218, which uses elastic rubber grommets and is present in CRT mounting screws and cabinets. Vibration separate CRT and CRT mounting lugs from vibration.
[0006]
However, since the size and shape of the shadow mask differ depending on the size and shape of the viewing screen, for example, those having various aspect ratios (aspect ratios) such as 4 to 3 (4 × 3) and 16 to 9 (16 × 9) are available. Including CRTs with different screen sizes have different shadow mask resonances. It is desirable to provide CRT mounting hardware for each CRT model so that a specific model (type) of CRT can be mounted in various cabinets without particularly considering vibration design for the cabinet. In other words, it is desirable to design the mounting hardware for a CRT model regardless of the cabinet in which the CRT is mounted.
[0007]
(Summary of Invention)
Disclosed is a vibration isolator for attaching a CRT to a housing. The support member has two molded high compliance members attached to the opposite diametrically opposite sides of the support member, with the coaxial openings in the three members. The support member is fixed to the CRT. The opening receives an elongated securing member, such as a screw, for securing the module and CRT to the cabinet. Two pre-formed high compliance members, along with the support member, minimize vibration transfer from the housing to the CRT. In one embodiment, along with a predetermined screw tightening torque, the parameters of the high compliance member are selected to minimize the propagation of specific vibration frequencies.
[0008]
(Description of Preferred Embodiment)
A cathode ray tube (CRT) is typically attached to a cabinet or housing by four mounting lugs with openings, and fasteners are inserted into each opening. Typically, the mounting lugs are placed at the corners of the cathode ray tube and along the diagonal of the rectangular faceplate. Such a configuration is well known in the art.
[0009]
Referring now to FIG. 1, the explosion-proof band 12 is provided on the CRT 10 as described above, and the attachment lug 14 is fixed to the explosion-proof band 12. The attachment lug 14 is provided with an opening 16 for firmly receiving the columnar support member 18. Recesses 24 are provided on the opposite side surfaces 20 and 22 of the support member 18 facing each other, and elastic members 26a and 26b are disposed in the respective recesses 24, respectively. The support member 18 and the elastic members 26a and 26b each have a coaxial cylindrical opening 28, and a fixing screw 30 for holding the opening in the opening 28 passes therethrough to fix the CRT to the chassis / housing 32. To do. A washer 34 is disposed concentrically around the screw 30 between the screw head 36 and the member 26a. A second washer 37 is disposed concentrically around the screw 30 between and in contact with the member 26 b and the housing 32.
[0010]
The elastic members 26a and 26b are made of a polymer material such as synthetic rubber or synthetic plastic, or an elastomeric elastic member such as neoprene or PVC (polyvinyl chloride). The rigidity of the elastic members 26a and 26b is selected so as to have a predetermined dynamic rigidity that can weaken the vibration and dynamic impact G force when a compressive force is applied. As shown, the elastic members 26a, 26b are generally hemispherical and fit snugly into their corresponding recesses 24, but other shapes such as conical or cylindrical are used to achieve the desired reduction in vibration frequency. It is also included in the inventive idea that the two members 26a, 26b need not be the same shape, size, or dynamic stiffness. The screw 30 tightening torque, which determines the amount of compression of the members 26a, 26b, and the durometer stiffness, shape, and dimensions of the members 26a, 26b are selected to reduce harmful frequencies from the cabinet / housing 32 to the CRT 10. Tune the system to prevent propagation. Typical such frequencies are in the range of 80 Hz to 90 Hz for soft-tension true-flat CRTs and somewhat higher for conventional molded shadow mask CRTs.
[0011]
Each of the clearances 38 between the washers 34, 37 and the support member 18 and the housing / cabinet 32 allows the vibrational energy to pass through the elastic member before being transmitted to the cathode ray tube, This void is limited to provide impact resistance in the Z plane along the longitudinal axis of the CRT. Thus, the disclosed anti-vibration mounting device captures undesirable frequencies, disperses vibration energy, and provides significant impact protection.
[0012]
The support member 18 can be secured within the opening 16 of the mounting lug 14 in several ways. For example, there is a method of welding or press (pressure) fitting, and the size is adjusted so that the inner diameter of the opening 16 and the outer diameter of the support member 18 are exactly matched, and the support member 18 is once cooled, and then at ambient temperature. The support member 18 is fixed to the mounting lug 14 by thermal expansion of the support member 18, or a screw is cut to the outer diameter of the support member 18, and the pair of retaining nuts are connected to the axial length of the support member 18. There is a system (not shown) that allows the mounting lug 14 to be tightened on both sides of the mounting lug 14.
[0013]
Furthermore, the disclosed modules of the support member 18 and the elastic members 26a, 26b can be determined for a particular CRT characteristic by a predetermined tightening torque on the screw 30; Such modules can then be used in various cabinets / chassiss regardless of the vibration characteristics of the cabinet / chassis.
[Brief description of the drawings]
FIG. 1 is an exemplary side view, partly cut away, of a CRT mounting arrangement according to an aspect of the present invention.

Claims (11)

An apparatus for supporting and arranging a cathode ray tube with respect to a housing and separating the cathode ray tube from vibrations existing in the housing,
A module including a support member;
A pair of molded elastic means attached to opposite diametrically opposed sides of the support member;
Each of the pair of support members and molded elastic means has a coaxial opening to receive an elongated securing means for securing the module to the housing;
The apparatus further comprises means for fixing the cathode ray tube to the support member,
Shape of said resilient means, dimensions, and elastic parameters are selected singly or in combination to reduce the propagation from the housing of the vibration to the cathode ray tube, the device. The apparatus according to claim 1, wherein the shape, size, or elasticity parameter of the elastic means is selected alone or in combination for a given cathode ray tube model.   The apparatus according to claim 1, wherein a shape, dimension, or elasticity parameter of the elastic means is selected alone or in combination for a predetermined vibration frequency. Wherein the shape of the pairs of the shaped elastic means, the size or elastic parameters, are not identical to each other, according to claim 1. It said resilient means is in the form of substantially hemispherical, according to claim 1. An apparatus for supporting and arranging a cathode ray tube with respect to a housing and separating the cathode ray tube from vibrations in the housing,
A module including a support member;
A pair of molded elastic means attached to opposite diametrically opposed sides of the support member to reduce vibration propagation from the housing to the cathode ray tube ;
Each of the pair of support members and molded elastic means has a coaxial opening to receive an elongated securing means for securing the module to the housing;
Further comprising means for locking said cathode ray tube to said support member, said device.   The apparatus according to claim 6, wherein the shape, size, or elasticity parameter of the elastic means is selected alone or in combination to reduce the propagation of selective vibration frequencies from the housing to the cathode ray tube.   The apparatus of claim 6, wherein the elastic means is substantially hemispherical in shape. A vibration separating device for attaching a cathode ray tube to a housing, comprising: a support member for reducing propagation of vibration from the housing to the cathode ray tube ; two on opposite opposite sides of the support member; The vibration separating device to which an elastic member is attached and which has a coaxial opening in the support member and the elastic member.   A cathode ray tube having an acoustic separation device for attaching a cathode ray tube to a casing, comprising: a support member for reducing vibration propagation from the casing to the cathode ray tube; A cathode ray tube in which two elastic members are attached to a side surface and a coaxial opening is formed in the support member and the elastic member.   An image display device having a vibration separating device for attaching a cathode ray tube to a housing, comprising a support member for reducing the propagation of vibration from the housing to the cathode ray tube, and the opposite sides of the support member facing each other A video display device in which two elastic members are attached to the side surface of the support member and a coaxial opening is formed in the support member and the elastic member.

Images