HEATING COOKER

• US 20160258631A1
• Filed: 11/06/2014
• Published: 09/08/2016
• Est. Priority Date: 11/06/2013
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: AIHARA, Katsuyuki, NAGATA, Ryuuji, SHICHI, Kazuyoshi
• Granted Patent: US 9,863,643 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: C03C 10/0027 containing SiO2, Al2O3, Li2O as main constituents
• CPC Class Codes: C03C 17/3602 the metal being present as a layer
• CPC Class Codes: C03C 17/3684 the multilayer coating being used for decoration purposes
• CPC Class Codes: C03C 17/44 Lustring
• CPC Class Codes: F24C 15/10 Tops, e.g. hot plates; Rings cover lids or splash guards F24C15/12; spillage trays or grooves F24C15/14
• CPC Class Codes: F24C 15/102 electrically heated
• CPC Class Codes: F24C 15/106 electric circuits
• CPC Class Codes: F24C 7/082 on ranges, e.g. control panels, illumination
• CPC Class Codes: F24C 7/083 on tops, hot plates

Abstract

A heating cooker includes: a top plate on which a cooking container to be heated is placed; an outer case as a main body having an upper surface on which the top plate is placed; a heater heating the cooking container; and a light emitting device disposed in the outer case, for displaying the heating state. The top plate includes: a glass substrate having a transparent light-transmitting low-expansion crystallized glass made mainly of Li₂O—AL₂O₃—SiO₂ and having β-quartz solid solution, having a crystal size smaller than the wavelength of visible light; a design layer having a black-based color disposed on an undersurface of the glass substrate; a diffusion region disposed partially on an undersurface of the design layer, for diffusedly emitting light from the light emitting device; and a light-blocking layer disposed on the undersurface of the design layer other than the diffusion region, for blocking light from below.

Claims

1. A heating cooker comprising:

a top plate on which a cooking container to be heated is placed;

an outer case having an upper surface on which the top plate is placed and making up a main body;

a heater element heating the cooking container to be heated on the top plate; and

a light emitting device disposed in the outer case, for displaying e.g. the state of heating effected by the heater element,

wherein the top plate comprising;

a glass substrate in the form of a transparent light-transmitting low-expansion crystallized glass made mainly of Li2O—

AL2O3-SiO2 and having β

-quartz solid solution as a main crystal, whose crystal size is smaller than the wavelength of visible light;

a design layer having a black-based color disposed on an undersurface of the glass substrate;

a diffusion region disposed partially on an undersurface of the design layer, for diffusedly emitting light from the light emitting device, the diffusion region containing a pearl pigment comprised of an inorganic pigment coated with a metal oxide; and

a light-blocking layer disposed on the undersurface of the design layer at least at a portion other than the diffusion region, for blocking light from below, the light-blocking layer containing an inorganic pigment.

3. The heating cooker according to claim 1, wherein

the top plate has, in the glass substrate and the design layer, 60% or more of infrared transmissivity and 60% or less of visible light transmissivity, upward from the top plate.

5. The heating cooker according to claim 1, wherein

the top plate has, in the glass substrate and the design layer and the diffusion region or in the black-based glass substrate and the diffusion region, 35 cd/m2 or more of light transmission amount from the light emitting device.

6. The heating cooker according to claim 1, wherein

the diffusion layer contains an inorganic pigment adjusting color tone.

7. The heating cooker according to claim 1, wherein

the pearl pigment has a particle diameter in a range of 1 μ

m-500 μ

m, larger than wavelengths of visible light.

8. The heating cooker according to claim 1, wherein

the metal oxide that coats the inorganic pigment, of the pearl pigment has a particle diameter of 200 nm or less, smaller than wavelengths of visible light, the metal oxide having a coating thickness of 1 nm-500 nm.

2. A heating cooker comprising:

a top plate on which a cooking container to be heated is placed;

an outer case having an upper surface on which the top plate is placed and making up a main body;

a heater element heating the cooking container to be heated on the top plate; and

a light emitting device disposed in the outer case, for displaying e.g. the state of heating effected by the heater element,

wherein the top plate comprising;

a glass substrate in the form of a black-based colored low-expansion crystallized glass made mainly of Li₂O—

AL2O3-SiO2 and containing a black-based colorant as an additive and having (3-quartz solid solution as a main crystal;

a diffusion region disposed partially on an undersurface of the black-based glass substrate, for diffusedly emitting light from the light emitting device, the diffusion region containing a pearl pigment comprised of an inorganic pigment coated with a metal oxide; and

a light-blocking layer disposed on the undersurface of the black-based glass substrate at least at a portion other than the diffusion region, for blocking light from below, the light-blocking layer containing an inorganic pigment.

4. The heating cooker according to claim 2, wherein

the top plate has, in the black-based glass substrate, 60% or more of infrared transmissivity and 60% or less of visible light transmissivity, upward from the top plate.

9. The heating cooker according to claim 2, wherein

the top plate has, in the glass substrate and the design layer and the diffusion region or in the black-based glass substrate and the diffusion region, 35 cd/m2 or more of light transmission amount from the light emitting device.

10. The heating cooker according to claim 2, wherein

the diffusion layer contains an inorganic pigment adjusting color tone.

11. The heating cooker according to claim 2, wherein

the pearl pigment has a particle diameter in a range of 1 μ

m-500 μ

m, larger than wavelengths of visible light.

12. The heating cooker according to claim 2, wherein

the metal oxide that coats the inorganic pigment, of the pearl pigment has a particle diameter of 200 nm or less, smaller than wavelengths of visible light, the metal oxide having a coating thickness of 1 nm-500 nm.