JPS5848725Y2 - lighting equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to lighting equipment, such as street lights and security lights, in which light distribution is controlled by a globe attached to the lamp body.

Conventionally, this type of lighting equipment has a lamp 1 as shown in FIG.
The lower surface of the lamp body 2 equipped with the lamp is covered with a globe 3 having Fresnel lens-like irregularities 5 on the outer surface of the lamp body side, and the globe 3 is generally integrally molded.

If the light from the lamp 1 is to be condensed or irradiated outward as a parallel beam through the globe 3, the cross section of the globe 3 should be shaped like a convex lens with the light center of the lamp 1 as the focal point, or the globe 3 For example, as shown in FIG. 2, it is necessary to form Fresnel lens-shaped concavities and convexities 5 facing in opposite directions with respect to the optical axis.

However, in the former case where a convex lens is used, the thickness of the globe 3 becomes too thick, making it impossible to put it into practical use.

In addition, in the latter case, in which Fresnel lens-like unevenness 5 is formed on the outer surface of the globe 3, the unevenness 5 provided on the lower side of the optical axis (on the side opposite to the lamp body) during the molding process cannot be removed with a half-shaped mold. There was a problem.

Therefore, as shown in FIG. 3, it has usually been possible to form Fresnel lens-shaped irregularities 5 only on the lamp body 2 side of the optical axis.

Therefore, the conventional globe 3 has the disadvantage that it is not possible to effectively control the distribution of light beams to a desired irradiation surface.

This idea was made to improve the above-mentioned drawbacks, and by forming Fresnel lens-like irregularities on the outer surface of the globe on the lamp body side and the inner surface on the opposite side of the lamp body, with the optical axis of the lamp as the boundary, The object of the present invention is to provide a lighting fixture that is easy to process and provides light distribution characteristics that are favorable in terms of optical theory.

An embodiment of this invention will be described below with reference to FIG.

In the figure, 1 is a lamp, and 2 is a lamp body with an open bottom to which the lamp 1 is mounted, and these are formed in the same manner as the conventional lamp shown in FIG.

Reference numeral 3 denotes a globe whose lower surface is open and has a mounting portion 3a formed corresponding to the periphery of the open surface of the lamp body 1, and the side surface 3a is connected to this surface 3.
It is inclined so that an orthogonal axis 4 connecting it to the optical center 1a of the lamp 1 is formed approximately on the bisector of a.

5 is a Fresnel lens-shaped unevenness formed on the outer surface of the globe side surface 3a on the lamp body 2 side with the optical center 1a of the lamp 1 as the focal point, with the orthogonal axis 4 as the boundary; 6 is the orthogonal axis 4 as the boundary. The side opposite to the light body of the side surface 3a (open side of the globe 3)
This is a Fresnel lens-like unevenness formed on the inner surface of the lamp 1 with the optical center 1a of the lamp 1 as the focal point.

Irregularities 5 formed on the outer and inner surfaces of this glove 3,
6, the lens surface is a surface that is inclined in the direction of inclination of the glove side surface 3a at an angle smaller than that inclination.

In the lighting fixture equipped with the light distribution control type globe 3 formed as described above, the unevenness 5 and 6 formed on the inner and outer surfaces of the side surface 3a of the globe 3 are shaped so that they are point symmetrical to each other. Therefore, if the parting line of the mold placed when molding the glove 3 is provided on the open surface of the lower surface of the glove 3, each mold can be easily removed.

Furthermore, when the light beam from the lamp 1 is irradiated outward through the globe 3, it can be made parallel to the orthogonal axis 4 between the optical center 1a and the globe side surface 3a (Fig. 5), which is a preferable light distribution in terms of optical theory. characteristics can be obtained.

Furthermore, by using the Fresnel lens-shaped irregularities 5 and 6, the thickness of the glove 3 can be made thin enough for practical use.

As explained above, according to this invention, it is possible to provide a lighting fixture that is easy to mold and has light distribution characteristics that are favorable in terms of optical theory.

It is clear that the glove is not limited to a type with an open bottom, but may be a closed type.

[Brief explanation of drawings]

Figure 1 is a schematic perspective view showing the configuration of a lighting fixture that uses a globe to control light distribution, like conventional street lights and security lights. Figure 2 shows that although moldability is difficult, it is preferable in terms of optical theory. FIG. 3 is a sectional view showing the main parts of a conventional glove. FIG. 4 is a partially cutaway sectional view showing an embodiment of the present invention. FIG. FIG. 2 is an explanatory diagram showing a light distribution curve of a device using a glove according to the invention. 1...Lamp, 1a...Light center, 2.
...Light body, 3...Globe, 4...
...Orthogonal axis, 5, 6...Irregularities. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a lighting device having a light distribution control type globe that is attached to the aperture of a light body equipped with a lamp, the globe has an inclination such that the aperture side of the light body has a wide angle, and the outer surface of the light body on the aperture side and this A lighting device characterized in that a Fresnel lens-like unevenness is formed on the inner surface, avoiding the outer surface, with the lens surface being a surface that is inclined in the direction of inclination of each surface at an angle smaller than the inclination angle of the surface.