Method for producing phosphor-encapsulating capillary tube, phosphor-encapsulating capillary tube, wavelength-converting member, and method for producing wavelength-converting member
AssigneeNippon Electric Glass Co., Ltd.
InventorsMasanori Wada, Sotohiro Nakajima, Tomoaki Kawamura
Life of this patent
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Abstract
Provided are a method for producing a phosphor-encapsulating capillary tube in which, when a phosphor is encapsulated thereinto, fluorescence from the phosphor is less likely to leak from an end of the capillary tube; and such a phosphor-encapsulating capillary tube. One end portion 10A of an elongate glass capillary tube 10 having an outer shape of a transverse cross-section elongated in a width direction thereof is heated until the one end portion 10A of the glass capillary tube 10 has been melted, integrated, and thus sealed.
Claims7
A phosphor-encapsulating capillary tube which is sealed at one end portion thereof and open at the other end portion thereof and into which a phosphor is to be injected through the other end portion thereof, the phosphor-encapsulating capillary tube comprising:
- a capillary tube body of a straight tube shape in which the outer shape of a transverse cross-section thereof is an elongate shape elongated in a width direction thereof and the thickness thereof is an approximately constant, the capillary tube body including flat plate side walls opposed to each other;
- and
- a sealing part sealing one end portion of the capillary tube body,
- wherein the sealing part is formed so that an outside diameter of the sealing part in the width direction gradually decreases toward a distal end thereof and an outside diameter of the sealing part in a thickness direction perpendicular to the width direction gradually increases and then gradually decreases toward the distal end thereof.
A wavelength-converting member comprising:
- a capillary tube sealed at both end portions;
- and
- a phosphor encapsulated in the capillary tube,
- wherein
- the capillary tube comprises:
- a capillary tube body of a straight tube shape in which the outer shape of a transverse cross-section thereof is an elongate shape elongated in a width direction thereof and the thickness thereof is an approximately constant, the capillary tube body including flat plate side walls opposed to each other;
- a first sealing part sealing one end portion of the capillary tube body;
- and
- a second sealing part sealing the other end portion of the capillary tube body, and
- at least one of the first and second sealing parts is formed so that an outside diameter thereof in the width direction gradually decreases toward a distal end thereof and an outside diameter thereof in a thickness direction perpendicular to the width direction gradually increases and then gradually decreases toward the distal end thereof.
Dependencies are inferred from the claim text.