JPH0332037Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an incandescent light bulb.

When designing an incandescent light bulb, voltage, power consumption,
Important specifications include the length of the filament coil and color temperature. Of these, the power consumption naturally requires a low value, and once the use of the incandescent lamp is determined, the voltage and length of the filament coil are automatically determined, and these cannot be changed significantly. Since the color temperature depends on these specifications, even if a high color temperature is required, it is difficult to satisfy this requirement once other specifications are determined. One way to increase the color temperature is to increase the heat retention effect by making the pitch of the filament coil denser, but once the diameter and length of the strands and the length and diameter of the filament coil are determined, the pitch is determined. Put it away. Of course, it is possible to make the pitch denser by reducing the diameter of the filament coil, but the diameter of the filament coil determines the limit of the diameter of the filament coil, and it is difficult to form a small diameter filament coil with a thick wire. It is. Therefore, in order to make the pitch denser, it is necessary to change the specifications by shortening the length of the filament coil as much as possible, but if this is shortened, there is also the problem that the luminous efficiency decreases. For this reason, multi-turn coils have been developed in which 2 to 4 strands of wire are spirally wound in parallel, but this requires a lot of time and effort to manufacture because it is difficult to wind multiple strands of wire at equal intervals accurately. There are some issues that need to be addressed.

Therefore, the purpose of the present invention is to provide an incandescent light bulb that has a high color temperature and is easy to form a filament coil by spirally winding the wire. This is achieved by an incandescent light bulb equipped with a filament coil in which a wire is formed into an elliptical or rectangular shape and spirally wound so that the wide side of the flat wire faces in the radial direction.

The present invention will be specifically described below based on embodiments shown in the drawings.

Figure 1 is a front view of a halogen lamp with a voltage of 50V and a power consumption of 525W.The quartz glass envelope 1 has an outer diameter of about 6 mm and an inner diameter of about 4 mm, excluding the sealing parts 11 at both ends. The length of the envelope is approximately 270mm. A plurality of filament coils 2 are electrically contacted in a line within this envelope 1, and the sum of the lengths of the filament coils 2 is 150 mm.

Here, the cross-sectional shape of the wire for the filament coil 2 is not a conventional circular shape, but a rectangular shape with a long side to short side ratio of about 2:1, as shown in FIG.
It is not limited to a rectangular shape, and may be an elliptical shape, but in short, it is a flat shape, and it is spirally wound so that the flat wide side faces in the radial direction, that is, the wide side is parallel to the axis. There is. And the inner diameter MD of filament coil 2 is 0.8mm.
Pituchi PP is 135%, weight per 200mm of wire (mg)
MG is 430. If a coil with the same MG value and circular cross-sectional shape is used to wind a coil with the same coil length and inner diameter as in this example,
The PP is about 170%, and it can be seen that the pitch can be made quite dense with the present invention. As in this example, for a low-volt type incandescent light bulb with a voltage of 50 V, if the power consumption is constant, it is necessary to use a wire with a large diameter, which shortens the overall length of the filament coil 2, but this If you try to make it longer, it will be tight
It is necessary to increase PP. Therefore, the heat retention property is lowered and the color temperature is lowered, but the present invention is suitable for low-volt type incandescent light bulbs because the overall length of the filament coil 2 does not become so short even if the pitches are made dense.

When the halogen lamp with the above configuration is turned on, it rises very quickly and has a luminous efficiency of 7 m/m.
W. Color temperature was 2500°K. Incidentally, when a halogen lamp with the same voltage, power consumption, and filament coil length was lit using a conventional wire with a circular cross-sectional shape, the luminous efficiency was 5 m/W and the color temperature was 2300°K.

In this way, the present invention can make the pitch of the filament coil denser, so the voltage and power consumption can be reduced.
Compared to the conventional example in which the length of the filament coil is the same, the luminous efficiency is better and the color temperature can be increased. Further, since the wide side of the wire is oriented in the radial direction, it is easy to wind the wire in a spiral shape, and has the advantage that the inner diameter MD of the filament coil can be reduced.

As explained above, the present invention includes a filament coil in which a flat wire is formed so that the cross section is elliptical or rectangular and is spirally wound so that the flat wide side faces in the radial direction. Therefore, according to the present invention, it is possible to increase the color temperature, and it is possible to obtain an incandescent light bulb in which it is easy to form a filament coil by spirally winding the strands.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a sectional view of a filament coil. 1...Enclosed body, 2...Filament coil.

Claims (1)

[Scope of utility model registration request] An incandescent light bulb equipped with a filament coil in which a wire is formed into a flat shape so that the cross section is elliptical or rectangular, and is spirally wound so that the wide side of the flat wire faces in the radial direction.