JPS6141081B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a light projector with improved control of light distribution.

As shown in FIG. 1, a conventional floodlight has a transparent front cover 4 made of flat glass or the like, and a reflector 3 is centered on the axis 0-0' of the light source 2 and focused on the center of light of the light source 2. It is mainly composed of a paraboloid of revolution (the reason for "abbreviation" is that it also includes a reflecting mirror 3 composed of a surface that combines many mountain shapes and waveforms along the outer shape of the rotating body). The Lord was the Lord. Therefore, the direct light from light source 2 has a large spread as shown by the dotted line in Figure 1, and when used at a shallow irradiation angle as shown in Figure 2, for example, there is no need for illumination. While a considerable amount of direct radiation is often emitted into the sky, there is often a lack of brightness directly below, and direct lighting equipment has even been added to compensate for this.
As a countermeasure to this problem, in some countries in other countries, a rod-shaped light source 2 as shown in Fig. 3 is used for soccer stadiums, etc.
A rectangular projector is in practical use, which is used horizontally and is equipped with a light shielding plate 7 that blocks direct light from above. However, this light shielding plate 7 is fixed to the fixture and the range of light shielding is also fixed, and it does not have a light shielding property against the spread of light in the horizontal direction, so if there is a border in the left and right direction of the projector, the Not only is the light emitted outside was wasted, but in extreme cases it also has the disadvantage of causing light pollution.

The present invention aims to improve energy efficiency and improve the quality of lighting facilities by improving the conventional drawbacks and controlling light directed in unnecessary directions toward effective directions. An auxiliary reflector whose one end (base) is supported by adhesive or suction on a rotatable front cover, and whose light end is positioned on a straight line connecting the center of the light source and the edge of the reflector opening. It is characterized by having been established.

The present invention will be described below with reference to FIG. 4. Reference numeral 1 indicates a projector main body, and 2 a light source attached to this main body 1. Reference numeral 3 denotes a reflecting mirror, which is mainly shaped like a paraboloid of revolution that is centered on the axis 0-0' of the light source 2 and expanded along the front opening with the optical center 0 of the light source 2 as the focal point. Therefore, in this projector, the light reflected by the reflecting mirror 3 is maximized in the direction of the axis 0-0'.
The direction of maximum luminous intensity by this reflecting mirror 3 will be hereinafter referred to as the optical axis. Reference numeral 4 denotes a front cover rotatably provided at the opening of the reflecting mirror 3, which is made of transparent flat disk glass, and whose center is orthogonal to the axis 0-0'. Reference numeral 5 denotes an auxiliary reflecting mirror according to the present invention, and its reflecting surface 51 stands upright from the front cover 4, and its tip 52 is located in front of the optical center 0 of the light source 2, and is located between the optical center 0 and the opening edge of the reflecting mirror. 31, and its base 53 is adsorbed to the front cover 4.
It is attached using methods such as gluing.

In the above embodiment, an auxiliary reflector 5 is attached to a flat disk-shaped front cover 4, which receives direct light from the light source 2 that is about to be emitted directly outside the device without entering the reflector 3, and reflects it forward. Since the auxiliary reflector 5 can be moved by rotating the front cover 4 about the axis 0-0', there is a risk that part of the direct light will be emitted into the sky and be wasted. In some cases, the auxiliary reflector 5 is positioned at the top, and in the case of illumination in border areas, the auxiliary reflector 5 is positioned on the right or left, thereby capturing wasted direct light and distributing it in an effective direction. becomes possible.

Note that if both upward and lateral control is required, the shape of the auxiliary reflecting mirror 5 may be devised, or a plurality of auxiliary reflecting mirrors 5 may be provided.

Furthermore, as shown in FIG. 5, if the brightness at a close distance directly below is insufficient,
By changing the angle with respect to the mirror 5, it is possible to distribute the light captured by the auxiliary reflecting mirror 5 directly below and to provide sufficient illumination. It is convenient for a projector to be able to easily select from FIG. 4 or FIG. 5 depending on the location of use, and for this purpose, it is sufficient to adopt a structure in which the angle of the auxiliary reflector reflection surface 51 with respect to the optical axis can be changed.

Since the present invention is configured as described above, the auxiliary reflecting mirror can be placed at any position centered on the optical axis without blocking the light directed toward the reflecting mirror. Therefore, among the light emitted from the opening of the reflecting mirror, the light emitted outward in an undesired direction can be reflected and irradiated in a desired direction in addition to the reflected light from the reflecting mirror and the direct light from the light source. In other words, it is possible to distribute all the light emitted from the light source in an effective direction. In addition to this effect, since the auxiliary reflector can be directly supported on the conventionally used front cover, the auxiliary reflector can be supported without any special support device, and the auxiliary reflector can be supported with a simple structure. and rotation. Moreover, since the front cover is transparent, neither the direct light from the light source nor the reflected light from the reflector and auxiliary reflected light are blocked by the auxiliary reflector support member, which improves light usage efficiency. In other words, effects such as being able to increase equipment efficiency can be expected.

[Brief explanation of the drawing]

Figure 1 is a partial sectional view showing a conventional floodlight;
The figure is an explanatory diagram showing an example of its use, Figure 3 is a sectional view of the main part of another conventional example, Figure 4 is a partial sectional view of a floodlight showing an embodiment of the present invention, and Figure 5 is also an auxiliary reflector. It is a partial sectional view showing a state where the angle of the mirror is changed. In the figures, the same symbols indicate the same or equivalent parts,
2 is a light source, 3 is a reflecting mirror, 4 is a front cover, and 5 is an auxiliary reflecting mirror.

Claims (1)

[Claims] 1. A light source, a reflecting mirror in which this light source is disposed, and which reflects a portion of the light from the light source outward from a circular opening provided in the optical axis direction, and a reflecting mirror that covers the opening of this reflecting mirror. There is also a transparent front cover whose periphery is rotatably attached to the periphery of the opening of the reflecting mirror, a base supported by adhesive or suction to this front cover, and a tip that is connected to the light center of the light source and the reflecting mirror. A floodlight characterized by comprising an auxiliary reflecting mirror located on a straight line connecting the opening edge of the mirror.