JPS6247122Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to floodlights used in indoor and outdoor stadiums, sports fields, construction sites, etc., and particularly to floodlights for high-intensity discharge lamps that use horizontal lighting lamps such as metal halide lamps as the light source. It is related to.

As shown in FIG. 1, in a conventionally commonly used floodlight for a high-intensity discharge lamp, the arc tube 3 of the lamp 2 is located on the light emission axis line A of the reflector 1, and the light emission tube 3 of the lamp 2 is located on the center axis B.
is always formed on the light projection axis A line. Furthermore, in order to project a light beam from above onto a surface to be illuminated, and to improve the utilization rate on the surface to be illuminated, a normal projector must be designed at a mounting height such that a predetermined projection angle is formed. Therefore, when installing the projector at a predetermined mounting height, it is necessary to tilt the central axis B of the projector and the lamp serving as its light source downward with respect to the surface to be illuminated. In this case, the projection angle is most often around 30° when various installation conditions are averaged. On the other hand, recently, in order to improve the luminous intensity of floodlights for high-intensity discharge lamps such as those mentioned above, horizontal lighting lamps such as so-called metal halide lamps are often used in place of conventional incandescent bulbs and mercury lamps. It's summery. However, for example, in a lamp for horizontal lighting, the luminous flux ratio and power of the lamp change depending on the central axis of the lamp, that is, the inclination angle of the lamp's arc tube when the lamp is lit, as shown in the lighting test example shown in Figure 2. do. That is, in this lighting test example, a is 0 when the lamp is held horizontally.
If the angle of inclination is changed from this state to 90° in the vertical direction with the lamp turned on, then
On the other hand, b shows the case where the inclination angle of the lamp is changed from a vertically inclined state of 90° to a horizontal position, that is, 0°. According to the results of this lighting test example, when the luminous flux ratio at the central axis of the lamp, that is, the inclination angle of the arc tube is 0°, is 100%, the luminous flux ratio of horizontal lighting lamps is the lowest at around 30° inclination angle. , it was also observed that the power also changes accordingly. From this, when using a horizontal lighting lamp for a conventional shaped floodlight, the luminous efficiency of the lamp decreases the most at the most common luminous flux projection angle, that is, at an inclination angle of around 30 degrees between the lamp and the arc tube. There was found.

In view of the above-mentioned problems, the present invention aims to keep the arc tube of the lamp in a horizontal position as much as possible when using a horizontal lighting lamp such as a metal halide lamp as a light source for a floodlight, so that the lamp faces downward in the most efficient state. The purpose is to provide a projector that can obtain a projection angle of around 30 degrees.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 3 and 4, 11 is a reflecting mirror. This reflecting mirror 11 is supported by a support arm 12, and its mounting attitude can be adjusted in the vertical direction by tightening or loosening a screw 13 of the support portion. The projection axis A of the reflector 1 is located at the rear of the reflector 1.
A socket cylinder 14 that is inclined downward is attached. When a horizontal lighting lamp 16 is attached to this socket tube 14 through a socket 15 housed inside, the light center of the arc tube 17 of the lamp 16 is located at the focal point c of the reflecting mirror 11, and the The central axis B is relative to the projection axis A of the reflector 11.
It is configured to be tilted around 30 degrees. Reference numeral 18 denotes a rear reflector mounted on the side of the socket tube 14, and 19 denotes a hinge for rotatably attaching the socket tube 14 to the rear of the reflector 11. The lamp 16 can be replaced by rotating the socket cylinder 14 behind the reflecting mirror 11 and removing it from the socket 15 as appropriate.

Since the present invention is constructed as described above, the light emitting axis of the reflector is tilted approximately 30 degrees downward while keeping the luminous tube of the lamp for horizontal lighting as horizontal as possible, so that the illuminated surface can be efficiently illuminated. This allows horizontal lighting lamps to be used with the highest luminous efficiency.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing the structure of a conventional floodlight, Fig. 2 A and B are graphs showing test results of lighting test examples for horizontal lighting lamps, and Fig. 3 is the structure of a floodlight according to the present invention. Partially cutaway side view showing 4th
The figure is also a side view showing the state of use. 11... Reflector, 12... Support arm, 13... Screw, 1
4... Socket tube, 15... Socket, 16... Lamp for horizontal lighting, 17... Arc tube, 18... Rear reflector, 19... Hinge.

Claims (1)

[Scope of utility model registration request] A socket tube is attached to the rear of a reflector that is supported by a support arm and freely rotates in the vertical direction, and the center of light in the arc tube of the lamp attached to the socket tube is located at the focal point of the reflector. A projector characterized in that its central axis is inclined at an angle of about 30 degrees with respect to the projection axis of the reflector, and the base of the lamp is located below the projection axis of the reflector.