JPS5826405A - Lighting apparatus with opal plate - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lighting fixture with a milky white plate that has high fixture efficiency and a thin fixture.

Conventional instruments with opalescent plates have a built-in general type 15Y rung as a lamp, and a white-painted reflector has been used as the instrument's reflector. This type of fixture has a luminance of around 3000 Cd/m'' on the milky white board surface, and has the characteristics of less glare than other general lighting equipment, and a nearly uniform brightness distribution on the milky white board surface. ing.

Although lighting fixtures with opalescent panels have these characteristics, the efficiency of the lighting fixtures is around 50%, which is extremely low compared to other lighting fixtures, such as open-bottom lighting fixtures and holder-shaped lighting fixtures. There was a problem.

Unfortunately, in order to equalize the brightness distribution on the milky white board surface, it is necessary to set a large distance between the lamp and the milky white board surface.
This increases the thickness of the lighting equipment, increases the weight of the lighting equipment, and increases the cost in terms of materials. There was a construction problem in that it was necessary to make the area wider.

In order to reduce the thickness of conventional lighting fixtures, it is necessary to shorten the distance between the lamp and the opalescent plate surface, and under this condition, the uniformity of brightness across the panel surface, which is a characteristic of luminaires with opalescent plates, can be maintained. Therefore, opalescent plates with high light diffusion and low diffuse transmittance have been used. Therefore, it is necessary to reduce the thickness of the lighting equipment and use a milky white plate with low diffused transmittance, which inevitably lowers the efficiency of the lighting equipment.

Non-inventive point 1. Conventional general expansion cover and white reflector are used for opalescent plate t1 lighting fixture. In contrast, I was able to pick up the lamp so that the J board was facing the other side.'' Compared to conventional lighting fixtures with opalescent plates that use general-purpose fluorescent lamps and white reflectors, the brightness distribution on the opalescent plate surface is almost the same. It has the same uniformity, z: ÷ J-1: efficiency = very high,
The present invention provides a lighting fixture that is made thinner.

The present invention will be explained in detail below.

In a lighting fixture with a milky white board, there are two methods for shortening the distance between the lamp and the milky white board surface while maintaining uniformity of brightness on the milky white board surface.

(b) Use a milky white plate with good diffusivity and low diffused transmittance.

(b) Use a reflective fluorescent lamp whose lamp brightness is low on the side facing the opalescent plate.

-1- Method (a): If the method described in (a) is used, the efficiency will decrease.

On the other hand, according to the method (b) above, if the reflective fluorescent rung has almost the same total tome as the general expansion 91r4 lamp, the opalescence using the conventional general fluorescent rung can be It is possible to create a thin luminaire with a luminaire efficiency that is approximately equal to or even higher than that of a board-mounted luminaire.

Furthermore, if a specular reflector is used in conjunction with the method described in (b), the light emitted from the opening of the reflective fluorescent lamp will be
The ball is fouled by the board and is irradiated onto the milky white board surface. The 117ζ light from the reflective fluorescent lamp directly reaches the opalescent plate surface, and the 117ζ light from the expansion light lamp reaches the opalescent plate surface. The specular reflector was designed to match the light distribution characteristics of the reflective fluorescent lamp so that the sum of the illuminance on the white plate surface was as uniform as possible at each position, making the fixture even thinner. Highly efficient lighting with a milky white plate 2) can be realized.

Fig. 1 shows the structure of the luminaire with an opalescent plate of the present invention for a two-lamp luminaire. In the figure, 1 is an opalescent plate, 2 is a reflective film part of a reflective fluorescent lamp, and 3 is an anti-expansion lamp. ) 1 part of the lamp, 4 is a specular anti-Ql plate, 5 is a white reflector, and 6 is the main body of the lighting fixture.

As an embodiment of the present invention, two lamps are installed in a row at an interval of 141711 with an aperture angle of 180 degrees and a tube diameter of 32 mm coated with a reflective film of fluoroapatite, one at the center of the lamp diameter and one on a milky white plate. s o with a distance of 46n+
The specular reflector of am ri's milky white plate lighting equipment will be explained.

As shown in Fig. 2, considering a cross section perpendicular to the lamp tube 111111, the direct light component from the lamp that is incident on each point (for example, a point at 1°) on the opalescent plate 9 is calculated by the boundary integral method. , a relative illuminance distribution on the opalescent plate surface as shown in FIG. 3 is obtained. The luminance of the tube wall of the reflection type fluorescent lamp used at this time was actually measured. If the luminance of the reflective film portion 7 is L (cd/m'), the luminance of the opening 8 is approximately 2 L (Cd/m'). /m').

FIG. 4 shows the relative illuminance that is insufficient to obtain the maximum relative illuminance Emax at all positions on the opalescent plate 9 based on FIG. 3.

6. G□ The present invention attempts to compensate for this deficiency by providing a mirror-surfaced q:j plate behind the lamp. In the case of this example,
Specular reflectors A, B, (z-in', B., C'
It was theoretically clarified that the relative illuminance shown in FIG. 4 is created on the surface of the opalescent plate by installing the . Figure 6 shows specular reflecting mirrors A. and B.

An enlarged view of C. is shown. In Fig. 5, the convex mirror reflecting part A (or in) with a radius of curvature of 6 crn compensates for the lack of illuminance on the opalescent plate in the middle of the instrument, and the convex mirror reflecting part B (or in) with a radius of curvature of 5 C'm B・) and plane mirror reflecting part C (or C・
) compensates for the lack of illumination on the opalescent plate at the end of the instrument. In the figure,
D' indicates the position of the reflective fluorescent lamp.

In addition, the white painted reflector other than the specular reflective part is a milky white plate.
Increase the average illuminance of 42. This is the relative illuminance distribution calculated based on the measured luminance data of the opalescent plate surface of a fixture with an opalescent plate using a general type fluorescent lamp shown in Figure 7 and illumination calculation using the boundary integral method, considering only direct radiation from the lamp. This can be seen from the fact that they almost match.

As explained in detail, the reflex expansion) 't clamp open 1-
By installing the lamp so that the first part and the specular reflector of the lighting fixture face each other, even if the current 71° white plate or a milky white plate with high diffuse transmittance is used, the brightness on the milky white plate surface can be reduced.
Is it possible to maintain a uniform rate of 1 metre, compared to the conventional method? 1.1'1 treatment (
= 1 It is possible to use white clay and make the device thinner and more efficient than other devices.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the opalescent plate A-1 illuminator of the present invention, Fig. 2 is a cross-sectional view near the center chair 1 of the lamp J-1, and Fig. 3 is a cross-sectional view orthogonal to the tube axis of the lamp. Figure 4 shows the relative value of the illumination IW distribution on the opalescent plate surface caused by 4 (direct radiation from the lamp). Right from the lamp, ]
) Figure 5 is a diagram showing the details of a specular reflector designed as an embodiment of the present invention, Figure 6 is a diagram showing the relative value of illuminance due to light other than vs. Enlarged view of
Figure 7 shows the conventional general expansion) Y: Actual brightness data of the milky white board surface when a lamp with a milky white board is turned on (dashed line in the figure) and the geometric position of this lamp and the milky white board In relation to this, it is a diagram showing a comparison with the relative value of the illuminance distribution (solid line in the diagram) theoretically calculated using the boundary integral method, considering only the direct light from the lamp. DESCRIPTION OF SYMBOLS 1... Opalescent plate, 2... Reflective film part of a reflective fluorescent lamp, 3... Opening part of a reflective fluorescent lamp,
4...Specular reflector, 6...White painted reflector, 6...Lighting equipment body. Name of agent: Patent attorney Toshio Nakao and 1 other person - Izu, G-Ku% - 0 Blasphemy 9 Tomoe Yasumi

Claims (1)

[Claims] A reflective fluorescent lamp and an opalescent plate are provided, a four-shape fluorescent lamp is attached so that the opening of the reflective fluorescent lamp and the reflective plate face each other, and the light emitted from the reflective fluorescent lamp and the reflective plate is A lighting fixture with an opalescent plate, characterized in that a specular reflector is installed in a part of the reflector plate to make the amount of light incident on the opalescent plate constant at the upper cauldron portion of the opalescent plate.