CN1252165A

CN1252165A - Cathode-ray tube having shrink fit band

Info

Publication number: CN1252165A
Application number: CN98804049A
Authority: CN
Inventors: H·R·斯旺克
Original assignee: Thomson Consumer Electronics Inc
Current assignee: Technicolor USA Inc
Priority date: 1997-04-10
Filing date: 1998-03-31
Publication date: 2000-05-03
Anticipated expiration: 2018-03-31
Also published as: MY126507A; CN1146953C; KR20010006098A; AU6789698A; KR100496483B1; TW525832U; JP2001519084A; WO1998045870A1

Abstract

A shrinkfit band (18) for a CRT (10) comprises a strip of metal having two ends (20, 22). At least one end (20) of the band is in contact with the CRT. The ends (20, 22) are joined by at least one connective joint (24) to form a loop. The loop is disposed around the CRT. The band is improved over prior bands by spacing an inside tail end (27) of the band a sufficient distance (d3) away from the connective joints to prevent an inward curl of the inside tail end (27).

Description

The cathode ray tube of being furnished with the shrink-fit band

The present invention relates generally to be furnished with the cathode ray tube (CRT) of explosion-proof band, particularly be furnished with this class cathode ray tube of shrink-fit band.

Background of invention

With metal tape preferably steel band form and have the ring that coils identical configuration with protected screen, make the explosion-proof band of shrink-fit type thus.By for example welding or crimping, link together at the two ends of an end of being with band.In some cases, be connected to form to encircle and make this band by connect end that two strip metals form ring or the metallic interconnect by will be short and metal tape in both sides.The periphery of ring is slightly less than the periphery of screen dish.This ring is heated to enough temperature, allows this ring to slip into screen dish side periphery so that this ring is expanded to.Along with the cooling of band, this encircles contraction, and surrounds the screen dish tightly, thereby the screen dish is exerted pressure.In order to save the cost of material and reduction shrink-fit band, the end of band generally extends to apart from guaranteeing that the distance of the tie point that the end links together is not more than 12.7mm (0.5 inch).Because the strap end portion of the side wall glass of close screen dish is only extended about 12.7mm from tie point, so the reaction force that acts on the tie point often makes the inner tail of band rotate, this inner tail contacts with the side wall glass of screen dish, cause the inner tail of band inwardly to curl, the mold pressing matched line of touch screen dish (mold match line) produces the tangible high pressure zone that extends to the afterbody that is parallel to strap end portion from last tie point.This high pressure zone produces high pressure " line ", makes the inner tail contact glass of band, often causes scuffing, or other glass damage, has increased the probability of cathode ray tube fault.The mold pressing matched line is the formed convex seam of two parts that connects screen dish mould.Unless damage field is ground away, otherwise the screen dish of damage can not re-use after reparation by this way.

Disclosure of an invention

The shrink-fit band that is used for CRT comprises the metal tape with two ends, and at least one end of this band contacts with CRT.Connect these ends to form ring by at least one tie point.This ring is around the CRT configuration.Inner tail by making band and tie point separate is enough to the distance that prevents that inner tail from inwardly curling, has improved band of the present invention.

Brief description of drawings

Below, illustrate in greater detail the present invention with reference to accompanying drawing, wherein:

Fig. 1 is the perspective view of CRT and shrink-fit band of the present invention;

Fig. 2 is the front view of the closing section side of shrink-fit band of the present invention;

Fig. 3 is the end view of closing section, and a plurality of tie points of novel band made in accordance with the present invention are shown;

Fig. 4 is the figure of inner surface of the novel band of Fig. 3, the tie point of expression closing section with respect to the fixing pressurization figure that is produced of the inner tail of band and with the overlapping protective tapes of the inner surface of this band on the action effect that produces;

Fig. 5 is the end view of prior art band, the tie point of expression closing section approach with inner tail caused curls;

Fig. 6 is the figure of the inner surface of prior art band shown in Figure 5, the expression tie point with respect to the fixing pressurization figure that is caused of magnetic tape trailer portion and with the overlapping protective tapes of the inner surface of prior art band on the curling effect that produces;

Fig. 7 is the end view of second embodiment of novel band, is illustrated in the connecting plate (plate) that extends between two ends of band; With

Fig. 8 is the figure of the inner surface of novel band shown in Figure 7 and connecting plate, expression pressurization figure.

DETAILED DESCRIPTION OF THE PREFERRED

With reference to Fig. 1-4, CRT 10 comprises the vacuum casting 12 with screen dish 14, and screen dish 14 is connected with cone 16 by unshowned glass capsulation part.By in 300 ℃ to 500 ℃ scopes the heating under the state of cooling undersized make its expansion in the shrink-fit band 18 that screen coils 14 peripheries, make then its cooling, thereby with this band be fixed on screen dish sidewall 19 around.The tension force with 18 that is cooled is exerted pressure to the sidewall of screen dish.By making the tension force minimum in screen dish bight, this reallocation of power reduces the quick-fried possibility that contracts of cathode ray tube.The first end 20 and the second end 22 that will have at least one steel band of a plurality of tie points 24 link together, and form closing section 26, are with 18 thereby form.Tie point 24 can form by welding or crimping (crimping).As shown in Figure 3 and Figure 4, tie point 24 is crimped.In crimping, roll or push this band, mechanically end that interlocking should band forms at least one tie point 24, is preferably formed as a plurality of tie points that are arranged in rows, thereby constitutes ring.In the U.S. Patent No. 4459735 of the Sawdon of on July 17th, 1984 issue, disclosed crimping in detail.Also can form the tie point 24 of welding by row, the about four points of connection of wherein every row.

With reference to Fig. 2, the width W with 18 is 47.62mm, and thickness is in 2.18 to 2.38mm scope.For example, 18 openings of being with near an edge 30 form a plurality of otch 28.The fillet 32 bridge joint otch 28 of band.Bar 32 is formed on the outside with 18 planes, so that the support of unshowned anti-magnetized coil being installed clip to be provided.A plurality of fixedly hangers 34 are fixed in each bight to be with.The otch 28 adjacent with the bight also comprises the groove 36 that is communicated with otch 28, and provides the tension force of guaranteeing on the closing section 26 to be no more than the device of design margin.This feature with 18 has more fully been described in the U.S. Patent No. 5181123 of the Swank of on January 19th, 1993 issue.

As shown in Figure 5 and Figure 6, in the prior art, shrink-fit band 118 has closing section 126, closing section 126 comprise with upper end 122 overlapping contact end 120.From adjacent tie point 124 to the contact end 120 inner tail 127 apart from d ₁Be not more than 12.7mm (0.5 inch).Also is 12.7mm from adjacent tie point 124 outside afterbody 129 of 122 to the upper end apart from d2.When being installed in this band on the not shown CRT, tension force T is applied to on 118 the tie point 124.These power cause around the rotation of tie point 124, but the effect of this rotation is the most obvious on the inner tail 127 of band.As shown in Figure 5 and Figure 6, thus contact end 120 towards the inside crimp extension inner tail of the sidewall of unshowned CRT 127 cut off be configured in 118 and CRT between cord belt 40.Pressurization figure (pressure pattern) 142 is pressed into is with 40, and expression bear maximum pressure with 118 zone.In some cases, curlingly be enough to cut off adhesive tape 40, scratch or the glass of damage CRT10 sidewall by what form with 118 inner tail 127.

In Fig. 3 and a preferred embodiment shown in Figure 4, form like this and of the present inventionly be with 18 so that the inner tail 27 from adjacent tie point 24 to this band first end 20 apart from d ₃Be at least 19mm (0.75 inch).From with the outside afterbody 29 of 18 the second end 22 to nearest tie point 24 apart from d ₂It is constant to remain on 12.7mm.Be configured in 18 and CRT between cord belt 40 show the pressurization figure 42 that its shapes are identical with the figure 142 of pressurizeing; But the difference of this pressurization figure 42 is that the maximum pressure zone enlarges at nearest tie point 24 with between with 18 inner tail 27 basically.Between nearest tie point 24 and inner tail 27, enlarge apart from d ₃Eliminated the turning effect that causes by tension force T, and prevented that inner tail 27 is inwardly curling towards the sidewall of CRT.By test strip 18 and adhesive tape 40, can easily judge the elimination of on inner tail 27, curling.

Fig. 7 and Fig. 8 represent the second embodiment of the present invention.In the present embodiment, shrink-fit band 218 comprises having by bonding ribbon 223 and links together with the first end 220 that constitutes closing section 226 and first metal tape of the second end 222 that bonding ribbon 223 is connected on each

end

220 and 222 by a plurality of tie points 224.Shrink-fit band 218 is configured in around the sidewall of unshowned CRT, and the inner tail 229 of the inner tail 227 of first end 220 and the second end 222 contacts with the sidewall of CRT respectively.

Inner tail

227 and 229 and a plurality of tie point 224 in nearest tie point be separated by 19mm at least apart from d ₃, this distance is enough to prevent each inner tail inwardly curling towards the CRT sidewall.The distance of the expansion between nearest tie point 224 and

inner tail

227 and 229 has been eliminated the turning effect that is caused by tension force T, prevents

inner tail

227 and 229 inwardly curling towards the CRT sidewall.Be configured in 218 and CRT between cord belt 40 show a pair of pressurization figures 242 and 244, the shape of this figure is mutually the same basically, and identical with pressurization figure shown in Figure 4.Inspection is with 218 and adhesive tape 40, and adhesive tape 40 shows not by the vestiges of

inner tail

227 and 229 cuttings, thereby can easily judge to curl and eliminate.

Claims

1. a shrink-fit band that is used for CRT (10) comprises having two ends (20,22; 220,222) metal tape, described two ends are by at least one tie point (24; 224) link together so that form, in one of them described end (20 of described band around the ring of described CRT configuration; 220,222) inner tail (27 that contacts with described CRT is arranged; 227,229); It is characterized in that described inner tail (27; 227,229) with described tie point (24; 224) standoff distance (d3), this distance are enough to prevent described inner tail inwardly curling towards described CRT (10).

2. shrink-fit band (18 as claimed in claim 1; 218), it is characterized in that the described inner tail (27 of described band; 227,229) with described tie point (26; 226) 19mm of being separated by at least.

3. shrink-fit band (18) that is used for CRT (10), the metal tape that comprises have first end (20) and the second end (22) overlapping with described first end, described first end and the second end link together by a plurality of tie points (24), to form closing section (26), described band be configured in described CRT screen dish (12) sidewall (19) on every side, and the described first end of described band is adjacent with described sidewall; It is characterized in that, the nearest tie point standoff distance (d3) of the inner tail (27) of the described first end (20) of described band and described tie point (24), this distance are enough to prevent described inner tail inwardly curling towards the described sidewall (19) of described CRT (10).

4. shrink-fit band as claimed in claim 3 (18) is characterized in that, the described inner tail (27) of the described first end (20) of described band and nearest tie point (24) 19mm of being separated by at least.

5. shrink-fit band (218) that is used for CRT (10), the metal tape that comprises have first end (220) and the second end (222), wherein first end (220) and the second end (222) are joined together to form closing section (226) by bonding ribbon (223), and by a plurality of tie points (224) bonding ribbon (223) is connected on described first and second ends, the sidewall (19) that described band is configured in described CRT on every side and described first and second ends of described first band contact with described CRT; It is characterized in that, described first and second ends (220 of described first metal tape, 222) has separately inner tail (227,229), inner tail (227,229) with described a plurality of tie points (224) in nearest tie point standoff distance (d3), this distance is enough to prevent described inner tail (227,229) inwardly curling towards the described sidewall (19) of described CRT (10).

6. shrink-fit band as claimed in claim 5 (218) is characterized in that, the described inner tail (227,229) of described first and second ends (220,222) of described first band and nearest tie point (224) 19mm of being separated by at least.