Integrated getter device suitable for flat displays
AssigneeSaes Getters S.P.A.
InventorsDaniele Martelli, Raffaello Lattuada, Claudio Boffito, Mario Borghi, Giuseppe Urso
Life of this patent
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Abstract
The invention relates to an integrated getter device essentially consisting of at least one evaporable getter device and at least one non-evaporable getter device, wherein the different getter devices circumscribe areas at least partially superimposed or coincident, lying on essentially parallel or coincident planes and preferably arranged in a coaxial way.
Claims14
An integrated getter device comprising at least one evaporable getter device and at least one non-evaporable getter device, wherein said at least two different getter devices circumscribe areas at least partially superimposed or coincident, lying on essentially parallel or coincident planes and arranged in a coaxial way, and wherein said at least two different getter devices are in thermal contact, said evaporable getter device consisting essentially of:
- i) a housing in the form of a hollow disk, having a toroidal groove, limited by an essentially cylindrical outer wall, provided with an inner circular border having centre C1 and radius R1;
- ii) an evaporable getter material inserted into said groove;
- iii) a deflector having a sole preferential direction, essentially concentric with said housing, wherein said deflector shows a notch essentially consisting of an arc of circle, having centre C2, different from C1, and radius R2 such that the ratio R2:R1, ranges from about 1 to about 3 which forms, with said inner circular border of said groove, a crescent-shaped slit.
The integrated getter device comprising:
- A. an annular evaporable getter device portion;
- B. an annular non-evaporable getter device portion coaxial with the annular evaporable device portion;
- C. a deflector carried by the annular evaporable getter device portion;
- wherein the deflector provides means for directing vapors of evaporable getter material in a unique preferential direction;
- wherein the two portions circumscribe superimposed areas in essentially coincident planes;
- wherein the evaporable better device portion comprises:
- i. a housing in the form of a hollow disk having a toroidal groove limited by an essentially cylindrical outer wall, provided with an inner cylindrical border having centre C1 and radius R1;
- ii. an evaporable getter material containing barium carried by the groove;
- iii. the deflector has a sole preferential direction, essentially concentric with the housing, wherein said deflector carries a notch of an arc of a circle having centre C2, different from C1, and a radius R2 such that the ratio R2:R1 is from about 1:1 to about 3:1 and which forms with said inner circular border of said groove, a crescent shaped slit.
An integrated getter device comprising:
- A. an annular evaporable getter device portion, including a barium releasing material of BaAl.sub.4 and Ni, capable of giving rise to an exothermic reaction whereby barium is evaporated;
- B. an annular non-evaporable getter device portion, and in thermal contact with said evaporable device portion, whereby heat generated by the exothermic reaction of BaAl.sub.4 plus Ni is transmitted to the non-evaporable getter material thereby activating it;
- C. a deflector carried by the annular evaporable getter device portion;
- wherein the deflector provides means for directing vapors of evaporable getter material in a unique preferential direction;
- wherein the two portions circumscribe superimposed areas in essentially coincident planes;
- wherein the evaporable getter device portion comprises:
- i. a housing in the form of a hollow disk having a toroidal groove limited by an essentially cylindrical outer wall, provided with an inner cylindrical border having centre C1 and radius R1;
- ii. an evaporable getter material containing barium carried by the groove;
- iii. the deflector has a sole preferential direction, essentially concentric with the housing, wherein said deflector carries a notch of an arc of a circle having centre C2, different from C1, an a radius R2 such that the ratio R2:R1 is from about 1:1 to about 3:1 and which forms with said inner circular border of said groove, a crescent shaped slit.
Dependencies are inferred from the claim text.