JPH05290818A - Lamp bulb inside refrigerator - Google Patents

Abstract

PURPOSE:To illuminate the refrigerator inside over a wide range and to exhibit stored goods clearly by setting wall-thickness dimension and neodymium oxide containing quantity at given values in a straight tubular glass outer tube for housing linkage lamp bulbs in which plural miniature lamp bulbes are connected in series. CONSTITUTION:In a lamp bulb for the refrigerator inside, linkage lamp bulbs 3, in which plural miniature lamp bulbes 2 are connected in series, are housed in a straight tubular transparent glass outer tube 1 including neodymium oxide, bases 4 are fixedly mounted on both ends of the glass outer tube 1, and both the end leads of the linkage lamp bulbs 3 are connected to respective bases 4. In such constitution, the wall thickness of the glass outer tube 1 is preferable within a range of 0.4-1.2mm from the absorption effect of yellow color light and luminous flux quantity, and the containing quantity of neodymium oxide is desired to be 3-7wt.% on the basis of all luminous flux and a mean color rendering evaluation number.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-compartment light bulb used for lighting in a refrigerator or the like.

[0002]

2. Description of the Related Art Conventionally, as a light bulb for a room of this kind, E
Equipped with 12 or E17 E-shaped mouthpiece, the outer diameter is 20-22
A small transparent bulb using a mm T-bulb is used.

[0003]

However, in such a conventional in-compartment light bulb, since the filament is formed compactly, it becomes a point light source-like illumination, and only a part of the refrigerator can be illuminated. Since transparent glass is used for the bulb, the emitted light becomes yellow light peculiar to the electric bulb, and there is a problem in that the colors of the items stored in the refrigerator cannot be seen clearly.

The present invention has been made to solve such a problem, and can illuminate a wide range of the inside of a refrigerator or the like, and can make the stored items in the inside look vivid, and further It is intended to provide an in-compartment light bulb capable of suppressing the temperature rise of the above.

[0005]

The in-compartment light bulb of the present invention comprises:
A straight bulb-shaped glass outer tube contains a connecting light bulb in which a plurality of small light bulbs are connected in series, and the glass outer tube has a wall thickness of 0.4 to 1.2 mm and neodymium oxide. Is contained in an amount of 3 to 7% by weight.

[0006]

With such a structure, the interior of the refrigerator or the like can be uniformly illuminated over a wide range, and the effect of neodymium oxide contained in the glass outer tube can make the items stored in the refrigerator look bright. Further, since the outer bulb of the glass accommodates a connecting light bulb in which a plurality of small light bulbs are connected in series, the heat generated from the heat generating portion in the outer bulb of the glass is not locally dispersed, and therefore the interior bulb The temperature rise can be suppressed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a light bulb for refrigerator according to an embodiment of the present invention. As shown in FIG. 1, a light bulb for a refrigerator according to an embodiment of the present invention stores a connecting light bulb 3 in which a plurality of small light bulbs 2 are connected in series in a straight glass transparent glass outer tube 1 containing neodymium oxide, The cap 4 is fixed to both ends of the glass outer tube 1, and the lead wires at both ends of the connecting bulb 3 are connected to each cap by soldering or the like.

The small light bulb 2 has a length of about 25 mm, and the introduction wire 6 crimped at both ends of the filament 5 is inserted into the glass tube so that the filament 5 is located on the axis of the cylindrical transparent glass tube 2a. Are vacuum-sealed at both ends. The connecting light bulb 3 is formed by connecting 10 lead wires at both ends of the small light bulb 2 in series, and the both lead wires are connected to the base 4 by the solder 7 as described above. ..

In such a structure, the inventor first
An experiment was conducted by changing the wall thickness of the glass outer tube. When the wall thickness of the glass outer tube was less than 0.4 mm, the absorption of yellow light was small, the effect of neodymium was insufficient, and the mechanical strength decreased. On the other hand, when it exceeds 1.2 mm, the luminous flux is remarkably reduced, and the price of the glass outer tube becomes expensive, and it is recognized that it is impossible in any case. Therefore, the thickness of the glass outer tube is preferably in the range of 0.4 mm to 1.2 mm.

Regarding the outer diameter of this glass outer tube,
Since the protrusion to the inside of the storage is large, the volume inside the storage is small, and the storage amount is small, which is an obstacle when storing the items.
It is preferably about 5 mm or less.

The inventor has found that the structure shown in FIG.
For the internal light bulb of, the outer diameter of the glass outer tube 1 is 10 mm,
A light bulb was manufactured using a glass outer tube having a wall thickness of 0.9 mm, a length of 340 mm, and various neodymium oxide contents as shown in Table 1.
When the total luminous flux and the average color rendering index Ra of each bulb were measured, the results shown in Table 1 were obtained. In addition, such an in-compartment light bulb was horizontally attached to the upper part near the front door in the refrigerator compartment, and the visibility of the items stored in the refrigerator (hereinafter referred to as stored items) was examined. It became as follows. In Table 1, ◯ marks indicate yes, and x marks indicate no.

[0013]

[Table 1]

As can be seen from Table 1, the total luminous flux of samples 5 and 6 is less than 110 lm, the total luminous flux is lowered and the brightness is insufficient.
The average color rendering index Ra was more than 80 at lm or more, but the absorption of yellow light (530 to 590 nm) was small, and the whiteness of the storage wall and the stored items did not appear vivid, that is, the visibility was poor. .. Samples 2, 3 and 4 all have a total luminous flux of 110 lm or more, have sufficient brightness, have an average color rendering index Ra of 80 or more, absorb yellow light well, and make the whiteness of the cabinet wall and the stored items vivid. I was allowed to show it. Therefore, in order to achieve the intended purpose of the present invention, it became clear that it is preferable to select the content of neodymium oxide within the range of 3 to 7% by weight.

A typical illuminance distribution of the interior light bulb of the present invention is shown as curve A in FIG. 2, and the illuminance distribution of the conventional interior light bulb is shown as curve B in FIG. As can be seen from the comparison between FIG. 2 and FIG. 3, in a relatively narrow refrigerator such as a refrigerator, the illuminance distribution of the irradiation surface illuminated at a short distance from the light source is The longer one is more uniform,
Shadows are also unlikely to occur.

A typical spectral distribution of the interior light bulb of the present invention is shown as a curve C in FIG. 3, and a spectral distribution of a conventional interior light bulb is shown as a curve D in FIG.

In general, neodymium glass absorbs yellow light (wavelength 570 to 590 nm) from the transmitted light and removes the yellowing peculiar to light bulbs to make the color of an object appear bright. Although it is said that it will be reduced by about 20%, the total light flux of the internal bulb according to the embodiment of the present invention is less than about 10%, and because the inner wall surface of the refrigerator is white, it is brighter than the conventional internal bulb. , You can make the stored items look vivid.

As described above, in the interior light bulb of the embodiment of the present invention, the connecting light bulb 3 in which the small light bulbs 2 are connected in series is housed in the glass outer tube 1 containing neodymium, and the bases 4 are fixed to both ends thereof. Thus, it is possible to uniformly illuminate the inside of the refrigerator over a wide range and to make the stored items look bright. In addition, since a connecting light bulb in which small light bulbs are connected in series is housed in the glass outer tube, the amount of heat generated by each small light bulb is small, and the amount of heat generated by the entire internal light bulb is also small. It is possible to suppress the temperature rise in the refrigerator due to.

In the above embodiment, the case where the bases are fixed to both ends of the glass outer tube containing neodymium has been described. However, in the present invention, one end of the lead wire of the connecting light bulb in which the small light bulbs are connected in series is provided in the glass outer tube. The same effect as described above can be obtained even if the glass outer tube is insulated and guided to the other end position of the lead-in wire and the base is attached to one end of the glass outer tube.

[0020]

As described above, according to the present invention, a connecting light bulb in which small light bulbs are connected in series is housed in a straight tubular transparent glass outer tube, and the transparent outer tube glass has a wall thickness of 0.
It has a size of 4 to 1.2 mm and contains neodymium oxide from 3 to
By containing 7% by weight, it is possible to uniformly illuminate the inside of the refrigerator over a wide range, and it is possible to make the colors of the items stored in the refrigerator look vivid, and to sufficiently suppress the temperature rise inside the refrigerator. It is possible to provide an in-compartment light bulb having an excellent effect of being able to.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an internal bulb according to an embodiment of the present invention.

[Figure 2] Illuminance distribution map of in-house light bulbs

[Fig. 3] Illuminance distribution map of a conventional in-house light bulb

FIG. 4 is a spectral distribution diagram of an in-compartment light bulb that is an embodiment of the present invention.

FIG. 5 is a spectral distribution map of a conventional in-house light bulb.

[Explanation of symbols]

 1 glass outer tube 2 small light bulb 3 connecting light bulb 4 base 5 filament 6 lead-in wire

Claims (1)

[Claims] 1. A straight tube-shaped glass outer tube containing a connecting light bulb in which a plurality of small light bulbs are connected in series, and the glass outer tube has a wall thickness of 0.4 to 1.2 mm. In addition, the interior light bulb is characterized by containing 3 to 7% by weight of neodymium oxide.