Electrical device including a functional element in a cavity
First Claim
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1. An electrical device comprising:
- a substrate including a functional element;
an insulating first film configured to form a cavity containing the functional element, together with the substrate, and to include a plurality of through-holes, the cavity including a space between the insulating first film and the functional element;
an insulating second film configured to cover the plurality of the through-holes, the second film being formed on the first film and having a gas permeability higher than that of the first film;
an insulating third film configured to form at least on the second film, the third film having a gas permeability lower than that of the second film, the insulating third film being in contact with the insulating second film; and
an insulating fourth film configured to form on the third film, the fourth film having an elasticity higher than that of the third film.
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Abstract
A substrate includes a functional element. An insulating first film forms a cavity which stores the functional element, together with the substrate, and includes a plurality of through-holes. An insulating second film covers the plurality of through-holes, is formed on the first film, and has a gas permeability which is higher than that of the first film. An insulating third film is formed on the second film and has a gas permeability which is lower than the second film. An insulating fourth film is formed on the third film and has an elasticity which is larger than the third film.
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Citations
26 Claims
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1. An electrical device comprising:
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a substrate including a functional element; an insulating first film configured to form a cavity containing the functional element, together with the substrate, and to include a plurality of through-holes, the cavity including a space between the insulating first film and the functional element; an insulating second film configured to cover the plurality of the through-holes, the second film being formed on the first film and having a gas permeability higher than that of the first film; an insulating third film configured to form at least on the second film, the third film having a gas permeability lower than that of the second film, the insulating third film being in contact with the insulating second film; and an insulating fourth film configured to form on the third film, the fourth film having an elasticity higher than that of the third film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 21, 22)
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13. An electrical device comprising:
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a substrate including a functional element; an insulating first film configured to form on the substrate, the insulating first film forming a cavity containing the functional element and including a plurality of through-holes, the cavity including a space between the insulating first film and the functional element; an insulating second film configured to form in the through-holes, the second film covering each of the plurality of the through-holes and having a gas permeability higher than that of the first film; an insulating third film configured to form on the first and the second films, the third film having a gas permeability lower than that of the second film, the insulating third film being in contact with the insulating second film; and an insulating fourth film configured to form on the third film, the fourth film having an elasticity higher than that of the third film. - View Dependent Claims (14, 15, 16, 17, 23, 24)
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18. A method of an electrical device comprising:
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forming an insulating first film having a plurality of through-holes on a substrate with a functional element, the first film forming a cavity which contains the functional element, together with the substrate, the cavity including a space between the insulating first film and the functional element; forming an insulating second film on the first film to cover the plurality of the through-holes, the second film having a gas permeability higher than that of the first film; discharging water vapor in the cavity to outside of the second film after formation of the second film; forming an insulating third film on the second film after discharging the water vapor, the third film having a gas permeability lower than that of the second film, the insulating third film being in contact with the insulating second film; and forming an insulating fourth film on the third film, the fourth film having an elasticity higher than that of the third film. - View Dependent Claims (19, 20, 25, 26)
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Specification