JPH0117045Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a high light output enclosed lighting fixture.

[Conventional technology]

Conventionally, there have been closed type lighting fixtures as shown in Figure 1. Reference numeral 1 is the appliance body, 2 is a cover, 3 and 3' are lamps, and 4 is a lighting device (ballast).

[The problem that the idea aims to solve]

In order to meet the demands for increasing the light output of enclosed lighting fixtures and reducing the number of fixtures, it is conceivable to increase the output of lighting fixtures.

However, even if the output of conventional sealed lighting equipment is increased, the luminous efficiency decreases significantly due to the temperature increase due to the significant increase in lamp power consumption, and the increase in output is almost canceled out by the decrease in luminous efficiency. As a result, it was discovered that there is a fundamental problem that does not exist in lighting equipment that outputs ordinary light output, that is, it is practically impossible to realize a closed-type lighting equipment that outputs high light output.

Therefore, an object of this invention is to provide a high light output enclosed lighting fixture that can relatively efficiently achieve high light output.

[Means for Solving the Problems] The high light output sealed lighting fixture of this invention has a light output type high frequency lighting device with increased lamp power consumption so as to output a light output higher than the rated light output of the lamp. be.

Here, the rated light output or more is 1.21 times the rated value or more, that is, 1.1 (lamp variation) x 1.1 (lighting device variation) or more, taking into account the variations in lamps and lighting devices (ballasts) that are usually referred to in JIS etc. shall refer to.

[Effect]

According to the configuration of this invention, the high-output high-frequency lighting device increases the lamp power consumption so as to output a light output higher than the rated light output of the lamp, although there is an overall decrease in efficiency due to the increase in lamp power. Since the degree of the decrease is small, it is possible to relatively efficiently realize a high light output sealed lighting fixture. Further, the degree of decrease in the luminous efficiency of the lamp relative to the ballast lighting device due to the rise in temperature within the lamp chamber caused by the sealed state of the lamp can be suppressed more effectively than in the case of normal light output.

〔Example〕

An embodiment of this invention will be explained based on FIGS. 2 to 4. In other words, this high light output sealed lighting fixture is one that has a high output type high frequency lighting device with increased lamp power consumption so as to output a light output higher than the rated light output of the lamp, that is, the high frequency lighting device is a high output type. This is what I did. The rated light output must take into account the variations in lamps and lighting devices (ballasts) that are usually referred to in JIS etc., and the range is 1.1 (lamp variations) x 1.1 (lighting device variations) = 1.21 times the range. Therefore, the rated optical output or more is 1.21 times or more of the rated light output.

More specifically, the luminous efficiency of a discharge lamp generally varies greatly depending on the ambient temperature of the lamp. Therefore, in general, fluorescent lamps are designed for exposed-lamp lighting equipment, so that the luminous efficiency is highest when the lamp ambient temperature is 20 to 25°C and the lamp consumes its rated power consumption. designed and manufactured.

Therefore, when such a fluorescent lamp is used in a closed-type lighting fixture covered with a cover 2 or the like as shown in Figure 1, heat from the lamp corresponding to the lamp's power consumption is trapped inside the lamp chamber, causing the lamp to burn out. It increases the room temperature (lamp ambient temperature), which significantly reduces the luminous efficiency of the lamp.

That is, FIG. 3 is a characteristic diagram of lamp luminous efficiency with respect to ambient temperature, and _Q1 is a luminous efficiency characteristic of a conventional ballast lighting device. Ta is the ambient temperature in the case of an exposed type fixture, Tb is the ambient temperature when applied to a closed type lighting fixture, and it can be seen that the lamp luminous efficiency of the closed type lighting fixture decreases significantly from η ₁ to η ₂ . Note that Tb−Ta, that is, the temperature rise ΔT ₁ is
As shown in FIG. 2, when a lamp with rated power consumption W ₁ of an enclosed lighting fixture is lit, aW ₁ =ΔT ₁ in proportion to the indoor power W ₁ of the lamp.
a is a constant determined by the instrument structure, shape, dimensions, material, etc.

On the other hand, when a high-frequency lighting device is used, a decrease in luminous efficiency can be suppressed. In other words, in Figure 3, _Q2 is the luminous efficiency characteristic of the high-frequency lighting device, which has higher luminous efficiency than the luminous efficiency characteristic _Q1 of the ballast lighting device, and the consumption required to obtain the same light output. Power W ₂ may be less than the ballast lighting device. As a result, the peak of the luminous efficiency characteristic Q ₂ shifts to the higher ambient temperature side. When such a high-frequency lighting device is applied to an enclosed lighting fixture, the temperature Tc becomes a temperature rise ΔT ₂ =aW ₂ as shown in Fig. 2, but W ₂ <W ₁
Therefore, ΔT ₂ < ΔT ₁ , and therefore Tc <
It becomes Tb. Furthermore, since the peak of the lamp luminous efficiency characteristic Q ₂ is shifted to the higher temperature side than the peak of the lamp luminous efficiency characteristic Q ₁ , η ₁ −η ₂ >η ₃ −η ₄ .
It can be seen that the reduction in lamp luminous efficiency is suppressed to a small extent by these factors.

Now, in the case of a high-output high-frequency lighting device in which the lamp power consumption is increased to output a light output higher than the lamp's rated light output, although there is an overall decrease in efficiency as the lamp power increases, as shown below. In addition, since the degree of the decrease is small, it is possible to relatively efficiently realize a high light output enclosed lighting fixture. Furthermore, the degree of decrease in the luminous efficiency of the lamp relative to the ballast lighting device due to the rise in temperature within the lamp chamber caused by the sealed state of the lamp can be suppressed more effectively than in the case of normal light output.

FIG. 4 shows luminous efficiency characteristics when a high-output lighting device is used. That is, Q ₁ ' is the case where the ballast lighting device is of a high output type, and Q ₂ ' is the case of this embodiment where the high frequency lighting device is of the high output type. In both cases where the conventional example is made into a high output type and in the case of this example, the peak of the lamp luminous efficiency characteristic shifts to the lower side of the ambient temperature. However, the degree of this is greater when a ballast lighting device is used. The reason for this is that in the conventional example, it is necessary to further increase the lamp power by the difference in efficiency caused by the transition, but in this example, the luminous efficiency at the ambient temperature Ta is improved, so the lamp power at lower ambient temperatures is This is because there will be fewer problems caused by the transition. As a result, the decrease in luminous efficiency when applied to enclosed lighting fixtures is η ₁ ′−η ₂ ′＞η ₃ ′−
η ₄ ', and it can be seen that this embodiment can be kept even smaller than the conventional example.

In addition, the degree of decrease in luminous efficiency of a sealed lighting fixture with high output using a high-frequency lighting device compared to that of a ballast lighting device is {(η ₁ ′−η ₂ ′)−(η ₃ ′−η ₄ ′)},
Degree of decrease in case of normal optical output {(η ₁ −η ₂ )−(η ₃ −η ₄ )}
Compared to (η ₁ −η ₂ )−(η ₃ −η ₄ )<(η ₁ ′−η ₂ ′
)−(η ₃ ′−
η ₄ ′), and the luminous efficiency itself also becomes η ₄ ′ >>
η ₂ ′. In other words, it is possible to more effectively suppress the degree of decrease in the luminous efficiency of the lamp relative to the ballast lighting device due to the rise in temperature inside the lamp chamber caused by the sealed state of the lamp, compared to the case of normal light output. It can be seen that a high light output sealed lighting fixture can be realized.

Note that although a lamp covered with a cover or the like is used as an example of a closed lighting fixture, it is not limited to fixtures with such a structure.
A similar effect can also be expected in appliances in which the heat emitted from the lamp is difficult to dissipate (for example, appliances in which the lamp is housed, and the dissipation of lamp heat due to convection is small).

[Effect of idea]

According to the high light output sealed lighting device of this invention,
Although there is an overall decrease in efficiency due to the increase in lamp power due to the high-output high-frequency lighting device that increases the lamp power consumption to output light output that exceeds the rated light output of the lamp, the degree of decrease is small, so it is better to compare This makes it possible to realize a high light output sealed lighting fixture with high efficiency. Further, there is an effect that the degree of decrease in the luminous efficiency of the lamp relative to the ballast lighting device due to the temperature rise in the lamp chamber caused by the sealed state of the lamp can be suppressed more effectively than in the case of normal light output.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional view of a conventional recessed lighting fixture, Figure 2 is a diagram of the relationship between lamp power consumption and rise in ambient temperature, and Figure 3 is a diagram of lamp luminous efficiency characteristics versus ambient temperature in a closed type lighting fixture. , FIG. 4 is a lamp luminous efficiency characteristic diagram with respect to ambient temperature in an embodiment of this invention.

Claims (1)

[Scope of utility model registration request] A high light output sealed lighting fixture having a high output high frequency lighting device with increased lamp power consumption so as to output a light output greater than the rated light output of the lamp.