Sealing material
AssigneeFutaba Corporation
InventorsMasahiro Kato, Junichiro Kogure
Life of this patent
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Abstract
A sealing material for sealing an envelop of electron tube. The sealing material comprises 0.01˜2.0 wt % of fine particle selected from the group consisting of SiO2, Al2O3 and ZrO2 having a particle diameter of 0.001˜0.1 μm, P2O5—SnO type low melting glass and thermal expansion-controlling low melting ceramics.
Claims6
A sealing material for sealing an envelop of electron tube comprising:
- P2O5—SnO type low melting glass powder;
- thermal expansion-controlling ceramics having low expansion coefficient;
- and
- insulating oxide fine particles having a particle diameter of 0.001˜0.1 μm.
A method of preparing a sealing material for sealing an envelope of electron tube comprising the steps of:
- distributing substantially uniformly insulating oxide fine particles having a particle diameter of 0.001˜0.1 μm in a vehicle,
- putting P2O5—SnO type low melting glass powder and thermal expansion-controlling ceramics having low expansion coefficient into the vehicle, and
- kneading uniformly a mixture of the insulating oxide fine particles, P2O5—SnO type low melting glass powder and thermal expansion-controlling ceramics having low expansion coefficient.
A vacuum fluorescent display comprising an envelop sealed with a sealing material and maintained in high vacuum, said envelop containing an anode on which a phosphor layer is deposited and a cathode as a source of an electron which emits light by bombarding an electron ejected from the cathode to the phosphor layer of the anode, wherein the sealing material comprises P2O5—SnO type low melting glass powder, insulating oxide fine particles having a particle diameter of 0.001˜0.1 μm and thermal expansion-controlling ceramics having low expansion coefficient.
Dependencies are inferred from the claim text.