JPH0424606Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention relates to an incandescent light bulb with a reflector suitable for spot lighting. [Prior art and its problems] In lighting in stores, etc., the beam angle is reduced to provide spot-like illumination to make the illuminated object stand out and enhance the illumination effect. This spot lighting lamp uses an incandescent light bulb with a reflector, which is held by inserting the crimp-sealed part of the incandescent light bulb into the center hole formed at the top of the reflector, but the beam angle is small and the central luminous intensity is low. It is important that the size is large, and it is also required that there be no uneven light distribution that would cause shadows on the illuminated object. However, it is difficult for the conventional incandescent lamps with reflectors for spot lighting to balance these contradictory characteristics, and those with a small beam angle and high center brightness have poor light distribution and shadows. On the contrary, in order to improve the light distribution, the beam angle and central luminous intensity have to be greatly sacrificed. [Purpose of the invention] Therefore, the purpose of the invention is to provide an incandescent light bulb with a reflector that has characteristics such as beam angle, central luminous intensity, and light distribution that are harmonized and has the characteristics required for a spot lighting lamp. do. [Structure and operation of the invention] The incandescent light bulb with a reflector of the present invention includes an incandescent light bulb having a crimp seal at one end, and a crimp seal inserted into a center hole formed at the top to hold the incandescent bulb. An incandescent light bulb has a frosted stippled surface on the outer surface of the bulb, and a reflector has a parabolic reflecting surface made up of a combination of many tiny flat surfaces. It is characterized by The reflector used in an incandescent light bulb with a reflector is a dimpled mirror with many small spherical concave parts formed on the paraboloid, and the reflective surface is formed into a paraboloid shape by a combination of many small flat surfaces. Although there are multi-mirrors, the present invention uses multi-mirrors, so the beam angle is small and the central luminous intensity is large. In addition, since the outer surface of the incandescent bulb is frosted in a stippled manner, the beam of light is lower than that of a clear lamp that has frosting applied to the entire surface of the bulb or a clear lamp that is not frosted. Characteristics such as corner and center luminosity and light distribution are harmonized. Therefore, the incandescent light bulb with a reflector is capable of illuminating large luminous intensity with a small beam angle without uneven light distribution. [Example] The present invention will be specifically described below based on an example shown in the drawings. FIG. 1 shows an incandescent light bulb with a reflector used for spot lighting. Incandescent bulb 1 has a rating of 110V,
The bulb 11 is made of quartz glass and has a crimp sealing part 12 formed at one end. A pair of molybdenum foils 13 are embedded in this crimp sealing part 12, and one end is connected to the molybdenum foil 13.
The filament 15 is connected to the valve 1 by a pair of internal leads 14 welded to the valve 1 and extending into the valve 11.
a pair of external lead wires 16 held along the axis of 1 and also having one end welded to the molybdenum foil 13;
extends outward from the crimp sealing part 12. As shown in FIG. 2, frost portions 17 are formed on the outer surface of the bulb 11 in a stippled manner.
Here, the term "stippling" refers to a state in which minute portions 17 subjected to frosting and portions 18 not subjected to frosting are uniformly mixed. The area ratio of the frost portion 17 is preferably about 70% to 80%. The larger the area ratio, the closer the characteristics will be to a completely frosted lamp, but conversely, the smaller the area ratio, the closer it will be to a clear lamp. is preferably within the above range. Furthermore, even if the area ratio is the same, it is easier to harmonize each characteristic when the frost portions 17 are small and have a large number per unit area.
pcs/cm ² or more is preferable. Note that in FIG. 2, a large frost portion 17 is illustrated for convenience. Further, the stippled frost portion 17 is formed on the valve 1.
It can be easily formed by covering 1 with a wire mesh of a predetermined mesh and frosting the top. The reflecting mirror 2 is a part of a glass paraboloid whose front part is expanded, and its inner surface is formed into a parabolic shape by a combination of a large number of mirror-treated minute planes 21, and is a multi-mirror. It is called. Then, the crimp sealing part 12 of the incandescent light bulb 1 is inserted into the center hole 23 on the base end side 24 and fixed with an adhesive. This proximal end side 24 has a ceramic base 3.
is fixed, and a screw cap 31 is placed over the small diameter portion at the rear, and a contact 32 is fixed to the rear end surface, so that the ends of the external lead wires 16 of the incandescent light bulb 1 are connected to the screw caps 31, respectively. and electrically connected to the contact 32. Therefore, when the reflector 2 is rotated and the base 3 is attached to a socket (not shown), the filament 15 is energized and can be lit. Next, such an incandescent lamp with a reflector was actually turned on, and the center luminous intensity (CD), beam angle (°), color temperature (K), and presence or absence of uneven light distribution were investigated. The frost area ratio of the incandescent bulbs used was 75%, and the number of pieces was
110 pieces/ ^cm2 . As comparative examples, the types of reflective mirrors (multi-mirror and dimpled mirror) and the types of incandescent light bulbs (fully frosted and clear)
The following combinations were also lit and compared with the previous example. The ratings of the incandescent bulbs were 110V and 100W, the same as in the example, and both were lit at the rated power consumption. Furthermore, the room temperature was 25°C. Comparative Example 1 Multi-mirror + Clear Comparative Example 2 Dimpled Mirror + Clear Comparative Example 3 Multi-mirror + Full-Full Frost The results of these investigations are shown in Table 1. Three lights were turned on for each, and the average value was shown. The units of each characteristic are as described above.

[Effect of idea]

As explained above, the incandescent light bulb with a reflector of the present invention consists of a multi-mirror reflector and an incandescent light bulb with stippled frosting, so the beam angle, central luminous intensity, light distribution, etc. Characteristics are in harmony,
It can be an incandescent light bulb with a reflector suitable for spot lighting.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a front view of an incandescent light bulb. 1...Incandescent light bulb, 11...Bulb, 12...Crimp sealing part, 17...Frost part, 2...Reflector,
21...plane, 23...center hole.

Claims (1)

[Claims for Utility Model Registration] An incandescent lamp comprising an incandescent lamp having a crimp seal at one end, and a reflector that holds the incandescent lamp by inserting the crimp seal into a center hole formed at the top, The light bulb has a stippled frosted finish on the outer surface of the bulb, and the reflecting mirror has a reflecting surface formed in a parabolic shape by a combination of many minute planes. Incandescent light bulb.