US3573527A - Shadow mask supported by bimetallic spring comprising coplanar strips with different coefficients of expansion - Google Patents

Shadow mask supported by bimetallic spring comprising coplanar strips with different coefficients of expansion Download PDF

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Publication number
US3573527A
US3573527A US795969A US3573527DA US3573527A US 3573527 A US3573527 A US 3573527A US 795969 A US795969 A US 795969A US 3573527D A US3573527D A US 3573527DA US 3573527 A US3573527 A US 3573527A
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United States
Prior art keywords
strip
electrode
color
expansion
envelope
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Expired - Lifetime
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US795969A
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English (en)
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Gerardus Antonius Hafkenscheid
Gerardus Wilhelmus Plukker
Jan Willem Ruis
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65C—LABELLING OR TAGGING MACHINES, APPARATUS, OR PROCESSES
    • B65C5/00—Labelling fabrics or comparable materials or articles with deformable surface, e.g. paper, fabric rolls, stockings, shoes
    • B65C5/02—Labelling fabrics or comparable materials or articles with deformable surface, e.g. paper, fabric rolls, stockings, shoes using adhesives
    • B65C5/04—Thermo-activatable adhesives
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/073—Mounting arrangements associated with shadow masks

Definitions

  • Trifari ABSTRACT A color display tube in which the shadow mask is suspended by means of resilient strips which consist of strips of metals having different coefficients of expansion, the narrow sides of which are welded together, the welding seam extending along the longitudinal axis of the strip, and the strip upon heating being bent in its plane in such a manner that the mask is moved towards the display screen.
  • the invention relates to a resilient suspension member for securing a color-selection electrode, particularly a shadow mask, in the glass envelope of a cathode ray tube for display ing colored television images.
  • the invention particularly relates to such a suspension member which partly consists of a bimetal and is arranged in such a manner that the color-selection electrode upon heating acquires a component of movement in the direction towards the display screen.
  • a displacement of the color-selection electrode, particularly a shadow mask is necessary to ensure that the electron rays still strike the correct color elements of the screen even upon expansion of the color-selection electrode due to heating.
  • the bimetal part must thus always be arranged in such a manner that this flexure is transferred directly or indirectly onto the color-selection electrode along the longitudinal axis of the tube. Conversely, however, a displacement of the colorselection electrode along the axis of the tube due to a shock or impact will always be transferred onto the bimetal part in the direction of the smallest moment of resistance of said part. It has been found that the stretching limit of at least one of the metals of the bimetal part is often exceeded so that this part undergoes a permanent deformation. The result is that upon a heavy shock against the display tube or dropping from a small height the color-selection electrode may undergo a permanent displacement directed along the axis of the tube, so that the color display is greatly affected.
  • the mentioned drawbacks are substantially obviated if according to the invention in such a resilient suspension member consisting at least partly of a bimetal, at least the free resilient part of the suspension member consists of a strip which is formed in that the narrow sides of the two metal layers form ing the bimetal are connected together in such a manner that the connection seam extends at least through part of the length of the free part of the strip.
  • the strip is preferably entirely formed by two strips of different metals extending along the length, the narrow sides of which are connected together. The direction of flexure upon heating thus is no longer at right angles to the largest surface of the bimetal strip but parallel to this surface, thus in the direction of the largest moment of resistance of the strip.
  • the suspension spring itself therefore performs not only the function of suspending the color-selection electrode but also the function of one of the two components of the bimetal. This is possible because the largest surface of the layers of the bimetal consisting of different metals do not lie upon each other but are secured to each other on their sides. The resilience of the layers in the direction at right angles to their surface is therefore not adversely affected.
  • the flexure in the plane of the strip is effected without torsion of the strip occurring if the two layers of the bimetal connected together on their narrow sides are formed in such a manner that the connection seam is uninterrupted and extends through part, or preferably throughout the whole free length of the resilient strip formed by these layers. and that in addition this free part of the strip lies in a flat plane and is straight as viewed on the narrow side. Since the forces occurring in the metal layers are comparatively very large, it is necessary to ensure a very satisfactory connection of the sides of the layers throughout the length, since otherwise flexure or torsion of the strip may locally occur.
  • One layer preferably consists of invar, which has a very low thermal coefficient of expansion, the other of stainless steel which has a much higher thermal coeflicient of expansion.
  • the connection of the strip to the color-selection electrode must also be very rigid.
  • the strip has a projecting portion which can be bent around the edge of the supporting frame: of the color-selection electrode.
  • Two projecting tags which facilitate bending are preferably provided for this purpose.
  • FIG. l is a side view
  • FIG. 2 is a plan view
  • FIG. 3 is a cross section taken on the line ll-Il of FIG. I ofa resilient strip according to the invention.
  • FIG. 4 is a perspective elevational view of a suspension member secured to a corner of a shadow mask
  • FIG. 5 is a bottom view of FIG. 4'
  • FIG. 6 is a view of a mask having three resilient members; while FIGS. 7, it and 9 are further embodiments according to the invention.
  • the resilient suspension member is indicated by l, which consists of a layer 2 of stainless steel (chromium nickel steel) containing approximately 18 percent by weight of chromium and 8 percent by weight of nickel and having a thermal coefficient of expansion of approximately I70.I0, and a layer 3 of invar (64 percent by weight of Fe, 36 percent by weight of Ni) having a coefficient of expansion of approximately 0.
  • the narrow sides of the layers 2 and 3 are welded together at 6, the welding seam extending throughout the length of the resilient strip II.
  • the strip It is provided with an aperture 7 which fits around a projection in the wall of the envelope.
  • the wide end which is welded to the color-selection electrode is provided with two tags 4i and 5.
  • the member II can be provided around a corner of the supporting frame 9 and welded in position at the areas 11, said supporting frame having a reentrant flange It) and supporting a shadow mask a.
  • the tags 4 and 5 are bent around the edge of the frame 9 and welded to the lower side of the flange It). A very rigid connection between strip and frame is obtained in this manner.
  • the layer 2 Upon heating, the layer 2 expands to a greater extent than the layer 3 so that the hollow side of the spring of FIG. II is curved on the lower side as is shown by the broken line. Since the projection I2 (FIG. 5) has a fixed position in the envelope '13 which supports the spring and the aperture 7, the curvature of the spring will cause an upward movement of the wide end and of the frame 9 secured thereto and the mask 3 so that the mask h is moved towards the phosphor screen.
  • Three springs 1 arranged as shown in FIG. 6 will generally be used.
  • the resilient strip appears to bend in its largest plane. Since large forces occur in the welding seam of the metal layers 2 and 3, strict requirements are imposed on this welding seam. It has been found that the flexure as a result of an increased temperature is smaller in the embodiments of FIGS. 7, s and 9 than in those of FIGS. 1, 2 and 3. The latter embodiments are therefore not particularly suitable. It is necessary that the welding seam s is homogeneous and is not locally interrupted. The seam is preferably welded electronically since a very homogeneous seam without ripple can then be obtained.
  • the securement of the wide end of the strip 1 to the frame 9 must be very rigid, since otherwise distortion may occur at the welding areas in case of heavy shocks (drop tests).
  • the strip ll thus the bimetal itself, is extremely strong in this case in directions parallel to the axis of the tube.
  • the long sides of the bimetal strip need not be straight but may alternatively be bent, so that a slightly falciform strip is obtained.
  • the free part of the strip 1 must preferably lie entirely in a flat plane in order to obtain the curvation in the plane of the strip.
  • the thickness of the layers 2 and 3 in a shadow mask having a weight of 900 gm. is, for example, 1.2 mm. It was found from drop tests that the permanent displacement of the mask 8 after a shock of 60 g. may be approximately l to 20 a. In the known constructions this displacement is from 30 to 70 p.
  • a cathode ray tube comprising an evacuated envelope having a substantially rectangular window at one end thereof, a plurality of phosphor triads constituting a luminescent screen disposed on said window, a substantially rectangular color-selection electrode having apertures therein aligned with said phosphor triads, and at least three bimetallic springs positioned along the perimeter of said electrode for supporting said electrode with minimum transferring of impacts from said envelope to said envelope, each of said bimetallic springs comprising two flat coplanar metallic strips having different coefficients of expansion along abutting longitudinal edges in a coplanar arrangement with one end secured to said electrode and the other end connected to said envelope, said strip having the greater coefficient of expansion being nearer said display screen whereby said electrode is moved in a direction towards said screen parallel to surfaces of said strips and orthogonal to longitudinal edges of said spring upon an increase in temperature of said electrode.
  • a color-selection electrode provided with at least three suspension members as claimed in claim 1, wherein at least one of these members is bent around a comer of the colorselection electrode and is welded thereto.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Thermally Actuated Switches (AREA)
  • Dry Shavers And Clippers (AREA)
US795969A 1968-02-08 1969-02-03 Shadow mask supported by bimetallic spring comprising coplanar strips with different coefficients of expansion Expired - Lifetime US3573527A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL686801741A NL150614B (nl) 1968-02-08 1968-02-08 Kleurselectie-elektrodesamenstel voor een kleurentelevisieweergeefbuis, alsmede ophangorgaan voor een kleurentelevisieweergeefbuis voorzien van een dergelijk kleurselectie-elektrodesamenstel.

Publications (1)

Publication Number Publication Date
US3573527A true US3573527A (en) 1971-04-06

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ID=19802699

Family Applications (1)

Application Number Title Priority Date Filing Date
US795969A Expired - Lifetime US3573527A (en) 1968-02-08 1969-02-03 Shadow mask supported by bimetallic spring comprising coplanar strips with different coefficients of expansion

Country Status (14)

Country Link
US (1) US3573527A (no)
AT (1) AT283465B (no)
BE (1) BE728038A (no)
BR (1) BR6906153D0 (no)
CH (1) CH487499A (no)
DK (1) DK118415B (no)
ES (1) ES363340A1 (no)
FI (1) FI44822C (no)
FR (1) FR1597297A (no)
GB (1) GB1192725A (no)
NL (1) NL150614B (no)
NO (1) NO121856B (no)
SE (1) SE345342B (no)
YU (1) YU31643B (no)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700948A (en) * 1970-07-09 1972-10-24 Motorola Inc Edge-bonded bi-metallic strip extending from metal plate on shadow mask to stud via spring of substantially smaller cross-sectional area than strip
US3894260A (en) * 1973-12-12 1975-07-08 Zenith Radio Corp Color selection electrode suspension system with bimetal structures having orthogonal deflection components
US3896321A (en) * 1973-12-12 1975-07-22 Zenith Radio Corp System for suspending a color selection electrode in a color cathode ray tube
US3898508A (en) * 1968-12-19 1975-08-05 Zenith Radio Corp Temperature compensated shadow mask for a color cathode-ray tube
JPS50143468U (no) * 1974-05-11 1975-11-27
US4315189A (en) * 1979-02-14 1982-02-09 Toshiba Corporation Support structure for shadow mask of color cathode ray tube
US4792719A (en) * 1987-08-31 1988-12-20 Gte Products Corporation Edge-bonded bimetal compensator for shadow mask
US5066886A (en) * 1989-10-31 1991-11-19 Carpenter Technology Corporation Thermally responsive article, method of making same, and a device incorporataing said article
US5233266A (en) * 1991-03-28 1993-08-03 Videocolor, S.P.A. Color picture tube having improved shadow mask-frame assembly support

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4604072A (en) * 1984-07-03 1986-08-05 Rca Corporation Method for engaging support studs into shadow mask spring apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330980A (en) * 1965-07-16 1967-07-11 Rca Corp Shadow mask mounted with bi-metallic sections connected by expansible loop
US3449611A (en) * 1966-06-22 1969-06-10 Nat Video Corp Suspension system for color television tube mask
US3452234A (en) * 1967-09-15 1969-06-24 Motorola Inc Mounting for a shadow mask assembly in a color cathode ray tube
US3479546A (en) * 1968-06-11 1969-11-18 Buckbee Mears Co Self-supporting shadow mask for colored tv picture tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330980A (en) * 1965-07-16 1967-07-11 Rca Corp Shadow mask mounted with bi-metallic sections connected by expansible loop
US3449611A (en) * 1966-06-22 1969-06-10 Nat Video Corp Suspension system for color television tube mask
US3452234A (en) * 1967-09-15 1969-06-24 Motorola Inc Mounting for a shadow mask assembly in a color cathode ray tube
US3479546A (en) * 1968-06-11 1969-11-18 Buckbee Mears Co Self-supporting shadow mask for colored tv picture tubes

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898508A (en) * 1968-12-19 1975-08-05 Zenith Radio Corp Temperature compensated shadow mask for a color cathode-ray tube
US3700948A (en) * 1970-07-09 1972-10-24 Motorola Inc Edge-bonded bi-metallic strip extending from metal plate on shadow mask to stud via spring of substantially smaller cross-sectional area than strip
US3894260A (en) * 1973-12-12 1975-07-08 Zenith Radio Corp Color selection electrode suspension system with bimetal structures having orthogonal deflection components
US3896321A (en) * 1973-12-12 1975-07-22 Zenith Radio Corp System for suspending a color selection electrode in a color cathode ray tube
JPS50143468U (no) * 1974-05-11 1975-11-27
US4315189A (en) * 1979-02-14 1982-02-09 Toshiba Corporation Support structure for shadow mask of color cathode ray tube
US4792719A (en) * 1987-08-31 1988-12-20 Gte Products Corporation Edge-bonded bimetal compensator for shadow mask
US5066886A (en) * 1989-10-31 1991-11-19 Carpenter Technology Corporation Thermally responsive article, method of making same, and a device incorporataing said article
US5233266A (en) * 1991-03-28 1993-08-03 Videocolor, S.P.A. Color picture tube having improved shadow mask-frame assembly support

Also Published As

Publication number Publication date
FI44822C (fi) 1972-01-10
NO121856B (no) 1971-04-19
GB1192725A (en) 1970-05-20
DE1902538B2 (de) 1976-04-08
YU31643B (en) 1973-10-31
BR6906153D0 (pt) 1973-01-11
NL150614B (nl) 1976-08-16
DK118415B (da) 1970-08-17
SE345342B (no) 1972-05-23
AT283465B (de) 1970-08-10
ES363340A1 (es) 1971-02-16
DE1902538A1 (de) 1969-08-28
CH487499A (de) 1970-03-15
FI44822B (no) 1971-09-30
NL6801741A (no) 1969-08-12
BE728038A (no) 1969-08-06
YU27269A (en) 1973-02-28
FR1597297A (no) 1970-06-22

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