JPH05109387A - Incandescent lamp-like color luminescent lamp - Google Patents

Abstract

PURPOSE:To improve the average color rendering index Ra and at the same time to shorten the time necessary to adjust the light color. CONSTITUTION:A phosphor layer, a first layer, is formed in the inner face of a glass tube and then a phosphor layer, a second layer, is formed on it. The luminescent peak wavelength of the first layer is 470-500nm and the layer consist of phosphors containing at least one of a bluish green-emitting bivalent europium-activated strontium-magnesium aluminate-based phosphor, antimony- activated calcium halophosphate-based phosphor, and a magnesium tungstate. The second layer consists of a mixture of two-component phosphors of cerium- terubium-activated green-emitting phosphor and trivalent europium-activated red-emitting phosphor. The ratios of the green-emitting phosphor and the red- emitting phosphor to the mixture of two-component phosphors are respectively limited within a specified range and the ratio of the weight of the phosphors in the second layer to the total weight of the phosphors is limited within a specified range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric bulb color fluorescent lamp having improved color rendering properties and improved light color management work efficiency.

[0002]

2. Description of the Related Art Conventionally, this type of fluorescent lamp has a straight tube shape,
In addition to general lighting such as round tube type, it is rapidly adopted for compact fluorescent lamps such as bulb-type fluorescent lamps and U-shaped fluorescent lamps, and its applications are expanding. The correlative color temperature of these fluorescent light bulb color lamps is 2700K to 31
The one of 50K is adopted.

This incandescent fluorescent lamp is (1) generally terbium or cerium-terbium activated green phosphor having an emission peak wavelength of 530 to 560 nm and trivalent europium activated yttrium oxide having an emission peak wavelength of 600 to 630 nm. A two-component phosphor mixture with the red phosphor of (2) the above-mentioned two-component phosphor mixture, further having an emission peak wavelength of 440 to 460 nm and a half value width of 30 to 70 nm. A one-layer coating structure coated with a three-component phosphor mixture to which a europium-activated blue phosphor is added, (3) An inexpensive and stable antimony / manganese-activated calcium halophosphate is deposited on the first layer There is known a two-layer coating structure in which the above-mentioned two-component or three-component phosphor mixture is applied to the second layer thereon.

[0004]

However, the above (1)-
The conventional light bulb color fluorescent lamp of (3) has an average color rendering index (hereinafter referred to as Ra) of 82 to 84.
In order to improve the above, it is necessary to add a blue-green phosphor having an emission peak in the range of 470 nm to 500 nm to the two-component or three-component phosphor mixture. Therefore, the types of phosphors in the phosphor mixture increase. In addition, the conventional light bulb color fluorescent lamp has a color temperature of 5000 K compared to the three-wavelength fluorescent lamp.
Since the mixing ratio of blue and blue-green phosphors is as small as 1/2 to 1/4, if the mixing ratio of blue and blue-green phosphors deviates from the desired light color, green and red with a large mixing ratio. Since the light color is adjusted by the phosphor, the amount of the phosphor mixture is inevitably increased. Further, in the fluorescent lamp of (3), although the amount of expensive rare earth phosphor used in the second layer can be reduced, the emission energy of the antimony-manganese activated calcium halophosphate phosphor having a color temperature of 7,000 K or less in the first layer is used. Therefore, there is a problem that Ra is lowered.

The present invention has been made in order to solve such a problem, and provides a light bulb color fluorescent lamp which improves Ra and shortens the time required for light color adjustment.

[0006]

The light bulb color fluorescent lamp of the present invention has a phosphor layer composed of a first layer and a second layer, which are sequentially formed on the inner surface of a glass tube, and the first layer emits light. Has a peak wavelength of 470-500 nm and emits blue-green light 2.
A europium-activated strontium-magnesium aluminate phosphor, an antimony-activated calcium halophosphate phosphor, and a phosphor containing at least one of magnesium tungstate phosphor,
The layer is composed of a two-component phosphor mixture of a terbium and cerium-terbium-activated green phosphor and a trivalent europium-activated red phosphor, and the proportion of the green phosphor G in the two-component phosphor mixture is g, When the ratio of the red phosphor R in the two-component phosphor mixture is r, there is a relationship of 0.33 ≦ g ≦ 0.38 0.67 ≧ r ≧ 0.62 g + r = 1. When the phosphor weight of the two layers is A and the total phosphor weight at that time is S, the ratio a of the phosphor weight A of the second layer to the total phosphor weight S is 0.48 ≧ a ≧ It has a relationship of 0.44.

[0007]

In the fluorescent lamp having the above structure, the desired light color can be adjusted by controlling and adjusting the amount of the fluorescent material deposited on the second layer.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

As a first layer on the inner surface of the glass tube, a divalent europium-activated strontium-magnesium aluminate phosphor having an emission peak wavelength of 470 to 500 nm and a half width at that time of 90 to 140 nm, and antimony activated. A blue-green phosphor composed of at least one of a calcium halophosphate phosphor (color temperature of 8000K or higher) and a calcium tungstate phosphor is adhered and formed, and a cerium / terbium activated phosphoric acid is formed as a second layer thereon. 2 of green phosphor made of lanthanum phosphor and red phosphor made of trivalent europium-activated yttrium oxide phosphor
The component-based phosphor mixture is formed by adhering the phosphor by changing the weight of the phosphor.
After that, a straight tube type 40 watt fluorescent lamp was produced by a usual method.

In Table 1, the correlation color temperature, the deviation from the black body locus (deviation amount: duv) and Ra when the ratio a of the phosphor weight A of the second layer to the total phosphor weight S was changed were measured. The results are shown. Further, Table 2 shows the results of measurement of the correlated color temperature, the deviation from the black body locus (deviation amount: duv) and Ra when the ratio of the G and R phosphors in the phosphor weight A of the second layer was changed. Show.

[0011]

[Table 1]

As can be seen from the results of Table 1, the correlated color temperature rises as the ratio a of the phosphor weight A of the second layer to the total phosphor weight S decreases. It can be seen that as the ratio a of Ra also decreases, the contribution of the emission energy of the blue-green phosphor of the first layer increases and Ra improves.
Then, when the ratio a is in the range of 0.44 to 0.48, Ra becomes 86 or more. This is a clear improvement over the conventional light bulb color fluorescent lamps of 82 to 84.

[0013]

[Table 2]

[0014]

[Table 3]

Further, from the results of Tables 2 and 3, the ratio a is kept constant and G and R relative to the weight of the phosphor of the second layer.
The ratio of the phosphor is 0.33 ≦ g ≦ 0.38, and 0.67
It can be seen that Ra is 86 or more in the range of ≧ r ≧ 0.62. Ra is 8 when g and r are out of the range.
It was found that the value was less than 6 and the value deviated from the chromaticity range of the compact fluorescent lamp of JIS in accordance with JIS. A typical spectral distribution at this time is shown in FIG.

As described above, the ratio a of the phosphor weight A of the second layer to the total phosphor weight S and the ratio of G and R phosphors to the phosphor weight A of the second layer are limited to By using the light emission energy of the fluorescent substance of the layer, it becomes possible to improve the Ra of the conventional fluorescent lamp of a light bulb color.

Further, since the phosphor mixture of the second layer is composed of two components, the light color can be adjusted only by controlling the weight of the phosphor of the second layer, and the working efficiency of the light color adjustment can be greatly improved. It was

In the above embodiment, the cerium / terbium-activated lanthanum phosphate phosphor was used as the G phosphor of the second layer. However, cerium / terbium-activated gadolinium borate phosphor and terbium-activated cerium aluminate phosphor are used. The same effect can be obtained by combining the magnesium phosphor and the trivalent europium-activated yttrium oxide phosphor.

[0019]

As described above, the present invention can provide a compact fluorescent lamp with improved color rendering properties and improved light color adjustment work efficiency.

[Brief description of drawings]

FIG. 1 is a typical spectral distribution diagram of a compact fluorescent lamp of the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toyoichi Amano 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electronics Industrial Co., Ltd.

Claims (1)

[Claims] 1. A first member, which is sequentially formed on the inner surface of a glass tube.
A phosphor layer consisting of a first layer and a second layer, the first layer having an emission peak wavelength of 470 to 500 nm, and emitting blue-green divalent europium-activated strontium-magnesium aluminate phosphor, antimony-activated A calcium halophosphate phosphor and a phosphor containing at least one of magnesium tungstate phosphor,
The second layer includes a terbium- and cerium-terbium-activated green phosphor and a trivalent europium-activated red phosphor.
When the ratio of the green phosphor G in the two-component phosphor mixture is g and the ratio of the red phosphor R in the two-component phosphor mixture is r, 0.33 ≦ g ≦ 0.38 0.67 ≧ r ≧ 0.62 g + r = 1, and when the weight of the phosphor of the second layer is A and the total weight of the phosphor at that time is S, the fluorescence A light bulb color fluorescent lamp characterized in that the ratio a of the phosphor weight A of the second layer to the total body weight S has a relationship of 0.48 ≧ a ≧ 0.44.