JPS5911363Y2 - display light bulb - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement in a display light bulb.

Conventionally, there are various types of indicator light bulbs, and one example, as shown in Figure 1A, is a light bulb b that is inserted and held in a translucent holder a that has a roughly hemispherical head. , this holder a is inserted into the hole of the mounting plate C to form a substantially hemispherical head a'
Some have a structure with a protruding front.

In this case, when the lead wire d of the light bulb b is energized, the light bulb b lights up and a beam of light is emitted to the outside from the head a' of the holder a, but there is a drawback that the skirt e of the head a' becomes dark.

This is thought to be because the position of the filament B' of the light bulb B is lower than the hem d. Some models have a higher position than part D, but if this is done, the shape of the head A' of holder A becomes taller, and the degree of protrusion from mounting plate C becomes large, which may be a problem when assembling it to a display device, etc. may occur.

There is also a method of scattering the light beam by mixing a diffusing agent into the holder, but this may cause problems because the direction of the emitted light beam is disrupted.

This invention was made in order to eliminate the conventional inconveniences as described above, and without causing the head of the holder to abnormally protrude from the mounting plate and without destroying the directivity of the emitted light beam.
To provide a display light bulb capable of brightly illuminating the bottom part of a holder head.

Hereinafter, this invention will be explained in detail with reference to the illustrated embodiment. Reference numeral 1 denotes a holder made of a transparent material such as rubber, synthetic resin, etc., and has a substantially hemispherical head 1a, and its inner surface is shaped to have a larger curvature than the tip of the light bulb 2, and a tapered surface 1b that slopes toward the light bulb 2 side is formed at the bottom at an angle θ.

In addition, the holder 1 has a belt-shaped circumferential surface 1C on the outer hem of the head 1a.
is provided, and the bottom of the head has a groove 1 in the part that touches the side wall.
d, while a plurality of vertically extending protrusions 1e are arranged side by side on the outer surface of the side wall, and a stepped portion 1f is provided at the lower part of the inner surface.

The light bulb 2 is inserted and held in the holder 1, and the bottom part is received by the stepped part 1f of the holder, so the light bulb 2
The lead wire 2a drawn out to the outside is protected by being covered with an insulating tube 3.

The display light bulb according to this invention is constructed as described above, and is used with the head 1a of the holder 1 protruding to the front by being inserted into the mounting plate 4 in the same manner as before. At this point, the light beam from the filament 2b of the light bulb 2 reaches the tapered surface 1.
b, is refracted in a direction close to perpendicular to the axis of the holder 1, and becomes a transmitted light beam 5 that passes through the band-shaped circumferential surface 1C and irradiates to the side, so that the bottom portion is dark. It is possible to prevent this from happening.

That is, by providing the tapered surface 1b with the inclination angle θ, the incident angle of the light ray can be changed and the light ray can be refracted toward the hem.

As a result, the irradiated light beam from the head 1a of the holder 1 is fully visible not only from the front side of the head but also from the side, and the range of display is expanded accordingly, which is extremely convenient.

In some cases, the tapered surface 1b may be provided with irregularities or a suitable force such as a Fresnel cut may be applied to diffuse the irradiated light beam at the hem.

According to this invention explained above, in the display light bulb,
The bottom part of the holder head, which used to be a dark area, can now be illuminated brightly, so the display function can be significantly improved, and there is no need to increase the amount of protrusion of the holder head from the mounting plate. , display devices and other various equipment
Assembling can be performed reliably, and since no diffusing agent is used in the holder, the directivity of the irradiated light is not impaired, and other excellent practical effects can be obtained.

[Brief explanation of drawings]

1A and 1B are a half-sectional view showing a conventional example, FIG. 2 is a half-sectional view showing an embodiment of this invention, and FIG. 3 is a bottom view thereof. 1...Holder, 1a...Head, 1b.
...Tapered surface, 2...Light bulb, 2a...
...Lead wire, 2b...Filament, 4.
...Mounting plate, 5...Light beam.

Claims (1)

[Scope of utility model registration request] A display light bulb in which a light bulb is inserted and held in a translucent holder having a substantially hemispherical head, and the holder is inserted into a hole in a mounting plate so that the head of the holder protrudes; A display light bulb characterized in that a band-shaped circumferential surface is provided on the outer hem of the part, and a tapered surface that slopes toward the light bulb at an appropriate angle is formed on the inner hem.