# US 2014/0194270 A1 · Crystallized glass housing

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- Number: US 2014/0194270 A1
- Document ID: US20140194270A1
- Status: Published application
- Kind: A1
- Application number: 14/155,801
- Filed: 2014-01-15
- Published: 2014-07-10
- Earliest claimed: 2011-07-15
- Assignees: Asahi Glass Company, Limited
- Applicants: Asahi Glass Company, Limited
- Inventors: Makoto SHIRATORI; YUUICHI IIDA; Kazuhide KUNO
- Web page: https://patentgrep.com/patent/US20140194270A1

## CPC

- C03C 3/118: containing aluminium
- C03C 3/083: containing aluminium oxide or an iron compound
- C03C 3/097: containing phosphorus, niobium or tantalum
- C03C 4/0028: {for crystal glass, e.g. lead-free crystal glass}
- C03C 4/02: for coloured glass
- C03C 10/0027: {containing SiO2, Al2O3, Li2O as main constituents}
- C03C 10/16: Halogen containing crystalline phase
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS

## Abstract

To provide a crystallized glass housing excellent in properties suitable for a housing for an electronic device, such as shielding properties, high strength and production cost. A crystallized glass housing made of crystallized glass, said crystallized glass having a diffused transmittance of 15% or less in the entire light wavelength region of from 380 nm to 780 nm, as measured by using an integrated sphere.

## Claims

### Claim 1

A crystallized glass housing made of crystallized glass, said crystallized glass having a diffused transmittance of 15% or less in the entire light wavelength region of from 380 nm to 780 nm, as measured by using an integrated sphere.

### Claim 2 (depends on 1)

The crystallized glass housing according to claim 1, wherein the crystallized glass is white in appearance, and when reflected light of a C light source to the crystallized glass formed into a flat plate having a thickness of 2 mm is measured, the reflected light is within a range of an area surrounded by a straight line passing through a point A (x: 0.2500, y: 0.2500) and a point B (x: 0.4000, y: 0.3500), a straight line passing through the point B (x: 0.4000, y: 0.3500) and a point C (x: 0.4000, y: 0.4000), a straight line passing through the point C (x: 0.4000, y: 0.4000) and a point D (x: 0.2500, y: 0.3000), and a straight line passing through the point D (x: 0.2500, y: 0.3000) and the point A (x: 0.2500, y: 0.2500) in CIE chromaticity coordinates.

### Claim 3 (depends on 1)

The crystallized glass housing according to claim 1, wherein the crystallized glass contains, as a color component, at least one member selected from the group consisting of metal elements of Co, Mn, Fe, Ni, Cu, Cr, V, Bi, Er, Sn, Ce, Pr, Eu, Nd and Ag in an amount of from 0.1 to 10% as represented by mol percentage based on metal oxides.

### Claim 4 (depends on 3)

The crystallized glass housing according to claim 3, wherein, when transmitted light of a C light source to the crystallized glass formed into a flat plate having a thickness of 2 mm is measured, the transmitted light has x of from 0.3 to 0.4 and y of from 0.3 to 0.4 in CIE chromaticity coordinates, and when reflected light of a C light source to the crystallized glass formed into a flat plate having a thickness of 2 mm is measured, the reflected light has x and y outside the range of the x and y of the transmitted light in CIE chromaticity coordinates.

### Claim 5 (depends on 1)

The crystallized glass housing according to claim 1, wherein the crystallized glass has a crystallite diameter exceeding 1,000 Å, as calculated by Scherrer's formula in X-ray diffraction measurement.

### Claim 6 (depends on 1)

The crystallized glass housing according to claim 1, wherein the crystallized glass has a compressive stress layer formed on the surface by chemical tempering treatment.

### Claim 7 (depends on 1)

The crystallized glass housing according to claim 1, which is to accommodate an electronic device.

### Claim 8 (depends on 1)

An electronic device which is accommodated in the crystallized glass housing as defined in claim 1.