JPH0525753U - LED lamp - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to prevent water droplets from adhering to the inner surface of the glass bulb by immediately removing even if water vapor is generated in the glass bulb. [Structure] A glass bulb contains a light emitting body of an LED and a hygroscopic agent and is hermetically sealed. During operation of the lamp, the LED luminous body generates heat, and a small amount of water contained in the LED luminous body and the printed circuit board becomes water vapor. The water vapor is adsorbed by the hygroscopic agent before becoming water drops and adhering to the uneven surface of the glass bulb, and therefore the light diffusion effect of the uneven surface is not lost.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention particularly relates to an improvement of a light bulb type LED lamp in which an inner surface of a glass bulb is frosted for a light diffusion effect.

[0002]

[Prior Art]

 Generally, in a light bulb type LED lamp, as shown in FIG. 2, two electrode wires 2 are drawn out from a glass stem 1, and a printed circuit board 3 such as an FRP is held and electrically connected to the electrode wires 2. Then, a plurality of LED light emitters 4 are mounted on the printed circuit board 3, the whole is sealed with a glass bulb 5, and a base 7 is fixed. In order to impart a diffusion effect to this light bulb type LED lamp, a fine uneven surface 6 is formed on the inner surface of the glass bulb 5 by frosting. Epoxy resin is usually used as the molding material for the printed circuit board 3 and the LED light emitter 4.

[0003]

[Problems to be solved by the device]

 However, since the epoxy resin contains a very small amount of water, a small LED bulb 4 in which a large number of LED luminous bodies 4 are housed in a small glass bulb 5 is used. Due to the heat generated by light emission, the water content of the epoxy resin is vaporized, and as shown in FIG. In the case of a clear light bulb in which the inner surface of the glass bulb 5 is not frosted, it is not so conspicuous, but in the case of the one having the uneven surface 6 as shown in FIG. 2, water droplets 8 adhere to the uneven surface 6. There was a problem that the unevenness disappeared, and the light diffusion effect could not be exhibited at all. An object of the present invention is to prevent water vapor from adhering to the inner surface of the glass bulb by immediately removing water vapor even if it is generated in the glass bulb.

[0004]

[Means for Solving the Problems]

 The present invention is an LED lamp characterized in that a hygroscopic agent is enclosed and sealed together with a light emitting body of an LED in a glass bulb.

[0005]

[Action]

 During operation of the lamp, the LED light emitter generates heat, and a small amount of water contained in the LED light emitter and the printed circuit board becomes water vapor and is generated. This water vapor is adsorbed by the hygroscopic agent before adhering to the uneven surface of the glass bulb as a water drop, and therefore the light diffusion effect of the uneven surface is not lost.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The basic structure of the light bulb type LED lamp is the same as that of FIG. 2, and two electrode wires 2 are drawn out from the glass stem 1, and the electrode board 2 is electrically connected while holding the printed circuit board 3 such as FRP. In order to connect, mount a plurality of LED light-emitting bodies 4 on this printed circuit board 3, seal the whole with a glass bulb 5 and fix a base 7, and to give a light diffusion effect to the lamp, A fine uneven surface 6 is formed on the inner surface of the glass bulb 5 by frosting. In such a structure, in the present invention, the hygroscopic agent 9 is incorporated inside the glass bulb 5. The moisture absorbent 9 is made of, for example, silica gel or zeolite, and is attached to the back surface of the electrode wire 2 or the printed circuit board 3 so as not to interfere with the light emission of the LED light emitter 4.

[0007]

[Effect of the device]

 Since the present invention has a structure in which a hygroscopic agent is housed and sealed in the glass bulb together with the LED luminous body, the LED luminous body generates heat during operation of the lamp, and is slightly contained in the LED luminous body or the printed board. Even if a large amount of water is generated as water vapor, this water vapor is adsorbed and removed by the hygroscopic agent before adhering to the cooling part of the glass bulb, and therefore the light diffusion effect in the case of a light bulb having an uneven surface is obtained. It will not be lost. In addition, it is possible to maintain long-term insulation of the printed circuit board and the electrode wire and improve reliability.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an LED lamp according to the present invention.

FIG. 2 is a sectional view of a conventional LED lamp.

[Explanation of symbols]

1 ... Glass stem, 2 ... Electrode wire, 3 ... Printed circuit board, 4
... LED light emitter, 5 ... glass bulb, 6 ... uneven surface, 7 ...
Base, 8 ... Water drop, 9 ... Hygroscopic agent.

Claims (3)

[Scope of utility model registration request] 1. An LED lamp characterized in that a hygroscopic agent is housed and sealed together with a light emitting body of an LED in a glass bulb. 2. The LED according to claim 1, wherein the plurality of LED luminous bodies are mounted on a printed circuit board in a glass bulb.
lamp. 3. The LED lamp according to claim 1, wherein an uneven surface for light diffusion is formed on the inner surface of the glass bulb.