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Vacuum heat insulator comprising a laminated core made of a plurality of sheets of inorganic fibers having 10 μm or smaller in diameter and a certain composition including SiO2 as a main component, Al2O3, CaO, and MgO, a gas barrier enveloping member, and an absorbent. The vacuum heat insulator is c

Vacuum heat insulator comprising a laminated core made of a plurality of sheets of inorganic fibers having 10 μm or smaller in diameter and a certain composition including SiO2 as a main component, Al2O3, CaO, and MgO, a gas barrier enveloping member, and an absorbent. The vacuum heat insulator is characterized by having at least one groove formed therein after fabrication of the vacuum heat insulator. Further, the vacuum heat insulator is characterized by using inorganic fiber core of which a peak of distribution in fiber diameter lies between 1 μm or smaller and 0.1 μm or larger, and not containing binding material for binding the fiber material. Electronic apparatuses use the vacuum heat insulator. With use of the vacuum heat insulator, electronic and electric apparatuses superior in energy saving and not to present uncomfortable feeling to the user can be provided.

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1. A vacuum heat insulator comprising:a laminated core comprising a plurality of sheet-formed inorganic fibers; an enveloping member; and an absorbent, wherein said inorganic fibers include 50-65 wt % of SiO2, 10-20 wt % of Al2O3, 10-20 wt % of CaO, and 1-4 wt % of MgO, a fiber diameter of said inor

1. A vacuum heat insulator comprising:a laminated core comprising a plurality of sheet-formed inorganic fibers; an enveloping member; and an absorbent, wherein said inorganic fibers include 50-65 wt % of SiO2, 10-20 wt % of Al2O3, 10-20 wt % of CaO, and 1-4 wt % of MgO, a fiber diameter of said inorganic fibers is 1 μm or larger and 5 μm or smaller, and a bulk density of said inorganic fibers is 100 Kg/m3 or more and 300 Kg/M3 or less. 2. The vacuum heat insulator according to claim 1, wherein said sheet-formed inorganic fibers are provided with a cut-off portion formed therein, except for an uppermost sheet and a lowermost sheet, and said absorbent is disposed in said cut-off portion.3. The vacuum heat insulator according to claim 1 further comprising at least one groove formed therein.4. The vacuum heat insulator according to claim 3, wherein said groove is formed symmetrically with respect to a centerline of said vacuum heat insulator.5. The vacuum heat insulator according to claim 4, wherein said vacuum heat insulator is bent along said groove.6. The vacuum heat insulator according to claim 4, wherein a thickness of said core in an area of said groove is one-half or less than a thickness in other areas of said core.7. The vacuum heat insulator according to claim 4, wherein one face of said enveloping member comprises a laminate film with a metal foil laminated on a plastic film, and another face of said enveloping member comprises of a plastic film with deposited metal or deposited metal oxide, and said vacuum heat insulator is bent in a manner that said face comprising the deposited plastic film face to an outside.8. The vacuum heat insulator according to claim 3, wherein said vacuum heat insulator is bent along said groove.9. The vacuum heat insulator according to claim 3, wherein a thickness of said core in an area of said groove is one-half or less than a thickness in other areas of said core.10. The vacuum heat insulator according to claim 3, wherein one face of said enveloping member comprises a laminate film with a metal foil laminated on a plastic film, and another face of said enveloping member comprises of a plastic film with deposited metal or deposited metal oxide, and said vacuum heat insulator is bent in a manner that said face comprising the deposited plastic film face to an outside.11. A vacuum heat insulator comprising:inorganic fibers, said inorganic fibers including SiO2 as a main component, Al2O3, CaO, and MgO, a fiber diameter of said inorganic fibers having a peak value of distribution of 1 μm or smaller and 0.1 μm or larger; an enveloping member; and an absorbent, wherein a bulk density of said inorganic fibers is 15 Kg/m3 or more and 100 Kg/m3 or less, and a bulk density of said inorganic fibers after an compression is 100 Kg/m3 or more and 300 Kg/m3 or less. 12. The vacuum heat insulator according to claim 11, wherein said inorganic fibers include 50-65 wt % of SiO2, 10-20 wt % of Al2O3, 10-20 wt % of CaO, and 1-4 wt % of MgO.13. The vacuum heat insulator according to claim 11, wherein said inorganic fibers are formed into a sheet-form, and a plurality of said sheet-form inorganic fibers are laminated.14. A hot/cold preserving apparatus using vacuum heat insulator for heat insulation, said vacuum heat insulator comprising:a laminated core comprising a plurality of sheet-formed inorganic fibers; an enveloping member; and an absorbent, wherein said inorganic fibers include 50-65 wt % of SiO2, 10-20 wt % of Al2O3, 10-20 wt % of CaO, and 1-4 wt % of MgO, a fiber diameter of said inorganic fibers is 1 μm or larger and 5 μm or smaller, and a bulk density is 100 Kg/m3 or more and 300 Kg/m3 or less. 15. The hot/cold preserving apparatus according to claim 14, wherein said hot/cold preserving apparatus comprises a hot/cold preserving box comprising:an outer casing; an inner cabinet; a lid; and a said vacuum heat insulator disposed between said outer casing and said inner cabinet. 16. The hot/cold preserving apparatus according to claim 15, wherein said hot/cold preserving apparatus comprises a hot/cold preserving box having a recess in an inside of a cover containing a hollow space, wherein said recess is provided with one of a cold storage unit and a heat storage unit, and said vacuum heat insulator is disposed at a recess side of said hollow space in a manner that said vacuum heat insulator covers along said recess.17. The hot/cold preserving apparatus according to claim 14 wherein said hot/cold preserving apparatus comprises a water heater comprising:a hot-water reservoir; an outer casing; a lid; a heater; and said vacuum heat insulator. 18. The hot/cold preserving apparatus according to claim 17, wherein said vacuum heat insulator is disposed in a space in said lid, and said vacuum heat insulator is formed in a shape substantially a same shape of a lower portion of said lid.19. An electric apparatus including a vacuum heat insulator, said vacuum heat insulator comprising:a core comprising inorganic fibers including a main component of SiO2 and having a peak value of distribution in fiber diameter of 1 μm or smaller and 0.1 μm or larger, a bulk density of said inorganic fibers being 15 Kg/m3 or more and 100 Kg/m3 or less, and a bulk density of said inorganic fibers after an compression being 100 Kg/m3 or more and 300 Kg/m3 or less, and said core not containing a binding material for fixing fiber material; an absorbent; and an enveloping member. 20. The electric apparatus according to claim 19, wherein said inorganic fibers include 50-65 wt % of SiO2, 10-20 wt % of Al2O3, 10-20 wt % of CaO, and 1-4 wt % of MgO.21. The electric apparatus according to claim 20, wherein said electric apparatus is any one selected a group consisting of refrigerator, vending machine, electric water heater, microwave oven, and notebook type computer.22. The electric apparatus according to claim 19, wherein said core comprises a plurality of laminated sheet of said inorganic fibers formed into a sheet form.23. The electric apparatus according to claim 22, wherein said electric apparatus is any one selected a group consisting of refrigerator, vending machine, electric water heater, microwave oven, and notebook type computer.24. The electric apparatus according to claim 19, wherein said electric apparatus is any one selected a group consisting of refrigerator, vending machine, electric water heater, microwave oven, and notebook type computer.