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US 2013/0329296 A1Published application
Device for growing sapphire ingot at high speed and sapphire cover glass having excellent optical properties
AssigneeHon Hai Precision Industry Co., Ltd.
InventorsGa-Lane CHEN, Chung-Pei WANG
Life of this patent
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Abstract
A device grows sapphire ingots by dipping a sapphire seed into molten aluminum oxide and lifting and spinning the sapphire seed from the molten aluminum oxide to cause the molten aluminum oxide adhering to the sapphire. Meanwhile, the device controls temperature such that the molten aluminum oxide is crystallized on the sapphire seed which is gradually cooled down to a room temperature. The device also includes a housing and air controller for providing desire air conditions for growing the sapphire ingot.
Claims20
A device, comprising:
- a crucible;
- an aluminum oxide material received in the crucible;
- a heater;
- a temperature controller configured for controlling the heater to heat the crucible such that the aluminum oxide material is molten into a liquid and a temperature above the liquid is smaller than a melting point of the aluminum oxide material and gradually decreases from the liquid to a top of the crucible;
- a heat preservation shell enclosing the crucible and configured for keeping a temperature filed within the crucible unchanged;
- a sapphire seed assembly comprising a sapphire seed;
- a driver configured for driving the sapphire seed assembly to move such that the sapphire seed dips into the liquid, and lifts out of the liquid and the crucible, and spins at predetermined speeds to cause that the liquid adheres to the sapphire seed, and is shaped cylinder-like, and is crystallized as the sapphire seed ascends and the temperature gradually decreases to form a sapphire ingot;
- a post-heating device configured for heating the sapphire ingot out of the crucible such that the sapphire ingot is gradually cooled down to a room temperature;
- a housing encloses the heat preservation shell and configured for providing air conditions and electromagnetic interference shielding for growing the sapphire ingot;
- and
- an air controller configured for vacuumizing the housing and introducing desire gases into the housing to control the air conditions within the housing.
8 more elements
A cover glass, comprising:
- a substrate;
- and
- an anti-reflection film coated on the substrate;
- wherein the substrate is made of the sapphire ingot, the anti-reflection film comprises a plurality of high refractive layers and a plurality of low refractive layers alternately stacked on the substrate, a structure of the anti-reflection layer is represented by (xHyL)n, which indicates that the anti-reflection film has “n” repetitions of (xHyL), wherein n is a positive inter and satisfies the condition:
- 4≦n≦8, each repetition of (xHyL) has the high refractive layer xH of an optical thickness “xλ/4” and the low index layer yL of an optical thickness “yλ/4”, wherein x and y satisfy the conditions:
- 1<x<2 and 1<y<2, and λ is a central working wavelength of the anti-reflection film, and a first one the high refractive layers is in contact with the substrate and a first one of the low refractive layers is in contact with the first high refractive layer.
3 more elements
Dependencies are inferred from the claim text.