JPS6347201B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceiling straight tube fluorescent lamp fixture suitable for illuminating a room with a relatively low ceiling height and a large area, such as an office.

Generally, lighting fixtures with wide illumination type light distribution characteristics are suitable for illuminating rooms with low ceilings and large areas, but in order to ensure sufficient vertical illuminance, lighting fixtures such as those shown in Figure 2 are suitable. It is called a battwing shape.
It is preferable to have a light distribution characteristic that provides stronger luminous intensity in diagonal left and right directions than in the direct downward direction. Although this type of idea has been advocated in the past, it has not been implemented in the form of specific lighting equipment other than for special purposes such as road lights, which mainly use point light sources. One of the reasons for this is that when trying to obtain a battwing-shaped light distribution with a fluorescent light fixture, it is necessary to tilt the reflective surface, which makes it difficult to block the fluorescent lamp in the front and tends to cause glare. .

The present invention aims to provide a ceiling straight tube fluorescent lamp fixture having a butt-wing type light distribution characteristic that solves the problem of glare. It also solves some problems associated with this implementation.

FIG. 1 shows an embodiment of the present invention, in which 1 is an instrument body, 2 is a diagonally downward reflecting plate with a substantially parabolic cross section, and this reflecting plate 2 is symmetrical with respect to the center line of the instrument body 1. Another reflecting plate 2 is arranged in parallel at the position. This pair of reflecting plates 2, 2
is arranged so that the center line of the parabola is inclined so that the upper side is closer to the outside of the instrument body and the lower side is closer to the inside of the instrument body. Although the central axis is not shown, it intersects directly below the instrument body, and the The reflected light is directed opposite to the centerline of the instrument body 1. As a result, the right reflector 2 creates a light distribution with a strong luminous intensity on the left side, and the left reflector 2 produces a light distribution with a strong luminous intensity on the right side of the fixture, and both obtain a butt-wing type light distribution. At this time, the opposing side edges 21, 21 of both the reflectors 2, 2 are bent in the vertical direction to form a vertical portion 3 at the center of the instrument body 1. This vertical part 3
Considering the possibility that the reflective plate 2 is tilted, the fluorescent lamp 4 can be seen directly when viewed from the opposite side, causing glare. It also serves as a light shielding plate.

Note that in order to reduce the height and width of the instrument body 1, it is preferable to bring the focus of the parabola constituting the reflector 2 as close to the reflector 2 as possible. For this reason, the fluorescent lamp 4 and the reflecting plate 2 come close to each other, making handling difficult. Therefore, a groove-shaped escape is made in the rear part of the fluorescent lamp 4, and this is used as the auxiliary reflecting plate 22. In the case of a parabola, the reflected light from the actual size part of the fluorescent lamp 4 is originally blocked by the fluorescent lamp 4 itself, so there is no problem in practice even if this part is not made up of a parabola. do not have.

Ideally, the elevation angle of the central axis of the parabola constituting the reflector plate 2 is set to about 60°, and the positional relationship between the fluorescent lamp 4 and the vertical portion 3 is determined so as to satisfy glare cut requirements. To this end, by spacing the lamps at least 2/3 of the width of the fixture body, predetermined characteristics can be obtained with dimensions almost similar to those of conventional fluorescent lamp fixtures.

The vertical portion 3 is also used for attaching the lighting duct 5. Reference numeral 9 denotes a spot light as an auxiliary illumination lamp suspended from an arbitrary position of the lighting duct 5. The lighting duct 5 is arranged between the opposing side edges 21, 21 of both the reflectors 2, 2 so as to be joined to each side edge 21, 21. One side of the reflector 2 on the side edge 21 side is larger than the other side leading to the frame of the instrument body 1, which makes the side edge 21 unstable.
1,21 Comrades highly rigid lighting duct 5
Since the two parts are connected via the two parts, vibration noise is less likely to occur.

As explained above, according to the present invention, a pair of reflecting plates forming a substantially parabolic shape are combined, and a vertical portion is formed at the center of the instrument body by the opposing side edges.
This vertical portion serves as a glare cut and restricts light directed directly below, making it easy to obtain a batting-shaped light distribution.

Additionally, a lighting duct was installed in the vertical section, making it convenient for hanging auxiliary lighting. on the other hand,
Since the side edges of one side (the larger side) of the reflector are connected via a highly rigid lighting duct, there is also the advantage that undesirable vibrations and noise of the reflector are less likely to occur.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing the device of the present invention;
FIG. 2 is a characteristic diagram showing a batting wing type light distribution. 1 is the appliance body, 2 is a reflector, 21 is a side edge, 4 is a straight tube fluorescent lamp, 5 is a lighting duct, 9
indicates an auxiliary illumination light.

Claims (1)

[Claims] 1 A pair of diagonally downward reflecting plates with a substantially parabolic cross section are arranged side by side in symmetrical positions with respect to the center line of the instrument body, and the central axes of both reflectors are aligned so that the upper side is closer to the outside of the instrument body and the lower side is closer to the inside of the instrument body. The opposing side edges of both reflecting plates are formed vertically, and a lighting duct connected to each side edge is placed between these side edges, and an auxiliary lighting lamp is suspended from the lighting duct. A straight tube fluorescent lamp fixture for ceilings.