JPH0451417Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a fluorescent tube used in an illumination device that can provide a surface light source with particularly uniform brightness.

[Conventional technology]

A conventional surface light source illumination device, as shown in FIG. On the other hand, there is a diffuser plate 13 on the opposite side of the reflector plate.
is arranged.

Among such lighting devices, for example, in a lighting device using a single linear light source, the brightness on the diffuser plate is distributed as shown in Figure 13, with the brightness being highest in the center near the light source and the brightness at the periphery. The distribution gradually decreases as one goes to the top, and the distribution is not uniform over the entire diffuser plate. In particular, when the light source 12 and the diffuser plate 13 are placed close to each other in order to make the lighting device thinner, the brightness of the area directly above the light source becomes particularly high due to the light emitted upward from the light source and directly reaching the diffuser plate.

For this reason, many attempts have been made to reduce the light directed upward from the light source so that the brightness on the diffuser plate becomes uniform.

One of the lighting devices based on this idea is the conventional example described in Japanese Utility Model Application Publication No. 61-90106, which uses a linear light source in the upper part (closer to the diffuser plate) of the fluorescent tube. A device in which a large number of linear light shielding portions 10 of a constant width are provided intermittently as shown in FIG. 14 is known. In this lighting device, an attempt is made to obtain a lighting device with a relatively uniform luminance distribution by appropriately selecting the width of each light shielding portion, the number thereof, the interval between the light shielding portions, and the like. However, this lighting device generally has a luminance distribution as shown in FIG. 15. In other words, in this conventional example, part of the light directed upward from the light source is blocked by the light shielding part, reducing the amount of light that reaches the center of the diffuser plate, which is directly above the linear light source, and the brightness of this center decreases. However, the brightness of the adjacent portions on both sides is high, resulting in a brightness distribution with two peaks, which is undesirable.

FIG. 16 shows a light source for an illumination device of this type that is provided with such a light shielding portion. In a lighting device using this light source, the brightness on the diffuser plate is relatively uniform.

In such a lighting device, the fluorescent tube used therein must be positioned so that the linear light shielding section (light amount control section) provided on the tube is correctly positioned above. In other words, if this light shielding part is not positioned correctly above, the brightness distribution on the diffuser plate will be uneven. Further, the fluorescent tube is provided with a trigger coat, and this portion must be placed on the opposite side from the diffuser plate.

For this purpose, conventionally, the fluorescent tube was positioned in the following manner.

That is, as shown in FIG. 17, the 18th
As shown in the figure, the rubber socket 14, one of which is flat, is fitted and positioned using the flat part as a reference. This method causes rotation between the rubber socket and the tube, which causes misalignment, making adjustment difficult, and when misalignment occurs, it causes uneven brightness.

Another conventional positioning method is shown in FIG. 19, in which a metal socket 15 having a flat portion 15a as shown in FIG. 20 is attached.
In this conventional example, the lead terminal of the electrode is connected to the socket 15.
Since the socket 15 and the pipe 12 are connected and fixed, there is no positional deviation between the socket 15 and the pipe 12, and accurate positioning is possible. However, the cost is high, and the length l of the socket becomes large, so the parts at both ends of the fluorescent tube that are not related to illumination become large, and the entire device becomes large compared to the effective part of the light source, making it impossible to make it compact. .

[Problem that the invention attempts to solve]

This invention is used in a lighting device in which a light source such as a linear fluorescent tube is placed on a reflector, and a diffuser is placed on the opposite side of the linear light source from the reflector. The present invention provides a positioning fluorescent tube for an illumination device, which is a linear light source having a light amount control section and whose rotation direction is regulated so that the light amount control section and trigger coat can be accurately positioned.

[Means for solving problems]

The positioning light source for a lighting device of the present invention is a light source used in a lighting device in which a linear light source is placed above a reflector and a diffuser is placed on the opposite side of the linear light source from the reflector. Moreover, a light amount control means such as a large number of linear light shielding parts arranged at intervals is provided on the upper surface thereof, and a positioning part for regulating the rotational direction of the light source is provided on at least one end electrode part. This positioning portion allows the light amount control means to be positioned correctly when the light source is placed in the lighting device.

〔Example〕

Next, each embodiment of the present invention will be specifically described based on the drawings.

FIG. 1 is a perspective view showing a first embodiment of the present invention;
FIG. 2 is a sectional view taken along the - line in FIG. 1.
In these figures, 1 is a fluorescent tube, and 2 and 3 are end electrode portions of the fluorescent tube 1, each of which has a flat section 2a in cross section as shown in FIG. Note that 4 and 5 are lead wires, respectively.

FIG. 4 shows a surface light source device using the fluorescent tube of the above embodiment, in which the main body 20 is provided with a reflector 11 and the main body 20 is provided with a reflector 11.
The fluorescent tube 1 is held by a holding plate 14 having a tube positioning portion 14a formed in the same manner as shown in FIG. Here, the fluorescent tube 1 of the present invention
is held such that its ends 2 and 3 are positioned between positioning portions 14a of a holding plate 14, for example, as shown in FIG. With this, fluorescent tube 1
is held in a predetermined position by the surface light source device, and the rotation direction of both ends 2 and 3 is regulated by the positioning portion 14a. Therefore, the end 2 of the fluorescent tube 1,
If the positional relationship between the flat parts 2a, 2b, etc. provided in 3 and the linear light shielding part 6 and the orientation of the positioning part 14a are determined in a predetermined direction, the linear light shielding part 6 as shown in the figure can be positioned correctly. A fluorescent tube can be installed to do so. In other words, in this embodiment, the flat surfaces 2a and 2b at the ends of the fluorescent tube constitute positioning and rotation prevention parts.

In this first embodiment, the flat surface serving as the positioning and rotation preventing portion may be provided only at one end of the fluorescent tube, and the other may simply hold the fluorescent tube.
Further, this plane may be provided only on one side as shown in FIG.

The fluorescent tube of the above embodiment has a flat surface 2a that serves as a reference surface for positioning in the process of sealing the end portion during manufacturing.
Alternatively, it is only necessary to form 2b, so it can be manufactured easily.

6 to 9 respectively show the shape of the end of the fluorescent tube and the shape of the positioning portion of the holding plate for holding it in the second to fifth embodiments.

In the second embodiment shown in FIG. 6, a flat surface 2a serving as a positioning portion is formed on the lower side of the end portion 2 of the fluorescent tube. Correct positioning is achieved by this and the positioning portion 14a of the holding plate 14.

In the third embodiment shown in FIG. 7, two v-shaped surfaces 2b are provided at the end of the fluorescent tube, and positioning is performed by these and the v-shaped groove 14b of the holding plate 14.

Embodiment 4 shown in FIG. 8 has a recess 2c at the end of the fluorescent tube.
This and the protrusion 14c provided on the holding plate 14 are used for positioning.

Embodiment 5 shown in FIG. 9 has a hole 2d at the end of the fluorescent tube, and a pin 1 provided on the holding plate 14.
4d.

Furthermore, FIGS. 10 and 11 are views of the sixth and seventh embodiments, respectively, viewed from above.

In the sixth embodiment shown in FIG. 10, recesses 2e are provided on both sides of the fluorescent tube end 2, and the recesses 2e and pins 14e provided on the holding plate 14 are used for positioning.

In the seventh embodiment shown in FIG. 11, a surface 2f is formed on the end portion 2 to make the tip thinner, so that the end portion 2 has a v-shape when viewed from above. This is positioned by fitting into a positioning member 14f provided on the holding plate 14.

In all of these embodiments, the positioning portion is provided at the end of the fluorescent tube, and can be formed during the manufacture of the fluorescent tube.

In the above-mentioned embodiments, the case where the end of the fluorescent tube is cut out or formed into a concave shape as a positioning portion has been explained, but contrary to that, the end portion of the fluorescent tube is formed into a convex shape. Of course, you can.

[Effect of idea]

Since the fluorescent tube of the present invention has a direct positioning part at its end, it is possible to form a light-shielding part on the tube and position the trigger coat accurately, and when used as a light source for a surface light source device, the tube can be easily positioned. Positioning of the upper light shielding part is easy and accurate, and uneven brightness of the surface light source device does not occur. Further, since the positioning portion is provided directly on the tube, no special parts are required, and the method is particularly effective when used in a thin light source device that is low cost and space efficient.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the first embodiment of the present invention;
The figure is a sectional view taken along the line -- in Fig. 1, Fig. 3 is a view showing another cross-sectional shape of the end of the above embodiment, and Fig. 4 is a partially cutaway view of the light source device to which the fluorescent tube of the present invention is attached. FIG. 5 is a perspective view showing a part of the holding plate of the light source device, and FIGS.
Figures illustrating the end shape of the fluorescent tube of the sixth embodiment;
FIG. 12 is a sectional view of the lighting device, FIG. 13 is a diagram showing the luminance distribution of the lighting device, FIG. 14 is a diagram showing an example of a fluorescent tube provided with a light shielding part, and FIG. 15 is a diagram showing the fluorescent tube. Diagram 1 showing the luminance distribution of a lighting device using
Fig. 6 is a diagram of a fluorescent tube provided with another light shielding part, Fig. 17 is a diagram showing a conventional fluorescent tube, Fig. 18 is an end view of the socket of the conventional example, and Fig. 19 is a diagram of the fluorescent tube. Another conventional example is shown in FIG. 20, which is an end view of the conventional socket shown in FIG. 19. 1... Fluorescent tube, 2, 3... End electrode part, 6...
Light amount control means, 14...holding plate.

Claims (1)

[Scope of utility model registration request] A light amount control means for controlling the amount of emitted light is provided on the upper surface of the illumination device used in an illumination device in which a linear light source is arranged above a reflecting plate and a diffuser plate is arranged on the opposite side of the reflecting plate with respect to the linear light source. In the light source,
1. A positioning fluorescent tube for a lighting device, characterized in that a positioning portion for regulating the rotational direction of the light source is directly formed on at least one end electrode portion of the light source.