JPH024081B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a thin surface light emitting body used in a backplane of a liquid crystal display (LCD) and the like.

[Prior art]

Conventionally, as this type of surface light emitter, there have been those shown in FIGS. 1 and 2. In Fig. 1, 1 is a light emitting body with a light emitting surface 2 on the front surface, 3 is a diffusing agent filled to cover a plurality of light sources (chip LEDs) 4 provided at the innermost part of the light emitter 1, and 5 is a print. A substrate 6 is a diffusion sheet that prevents the diffusion agent 3 from spilling out, and this diffusion sheet 6 becomes the light emitting surface 2.
Reference numeral 7 denotes a reflective surface for smoothly guiding the light from the light source 4 provided at the bottom of the light emitter 1 to the light emitting surface 2. Further, in FIG. 2, reference numeral 8 denotes a light shielding plate provided corresponding to each light source 4 to prevent the light from the light source 4 from directly reaching the light emitting surface 2. The other details are the same as in FIG.

Next, the effect will be explained. In Figure 1,
Light emitted from a light source 4 placed at the bottom of the light emitter 1 is diffused by the diffusing agent 3 filled in the light emitter 1, reflected by the reflective surface 7, and emitted from the light emitting surface 2 to the outside. Furthermore, a diffusion sheet 6 is provided in front of the light emitter 1.
By providing this, the light is further diffused. However, due to the thin shape, the distance from the light source 4 to the diffusion sheet 6 does not sufficiently diffuse the light, and the stripes 9 of the light source are reflected directly on the light emitting surface 2. In FIG. 2, the light emitted from the light source 4 placed at the bottom of the light emitter 1' is
A plurality of light shielding plates 8 are provided so that the light does not directly reach the light emitting surface 2, and the light travels along a reflecting surface formed by a curved slope. Thereby, a distance for light to pass through the diffusing agent 3 can be ensured even though it is a thin light emitter. However, even in this structure, the plurality of light shielding plates 8 do not have a sufficient effect, and the light goes around the light shielding plates 8 due to the diffraction phenomenon, forming stripes 9' on the light emitting surface 2.

Conventional surface light emitters are constructed as described above, so in the case of Fig. 1, there is no problem if there is a sufficient distance from the light source 4 to the light emitting surface 4, but if the light emitter is made thin and the distance is sufficient. If it cannot be removed, use diffusing agent 3.
Light is emitted from the light emitting surface 2 without being able to obtain sufficient effects. Therefore, the light source 4 is directly visible from the outside, and a uniform light emitting surface 2 cannot be obtained. What was done to improve this problem is shown in FIG. 2. In the case of FIG. However, since the size of each light shielding plate 8 is smaller than the light source 4, the direction of the light is not sufficiently determined.
There was a problem in that light went around the light shielding plate 8, creating arc-shaped light stripes around the light source 4 around the light shielding plate 8, making it impossible to obtain a uniform light emitting surface.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it prevents light from directly reaching the light emitting surface and secures a sufficient passage distance for the light diffusing agent to diffuse the light sufficiently. It is an object of the present invention to provide a thin surface light emitter that can provide more uniform surface light emission.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Components that are the same or equivalent to those in FIG. 1 or FIG. 2 are given the same reference numerals, and redundant explanation will be omitted. In FIG. 3, reference numeral 8' indicates a light shielding plate provided in a series along the longitudinal direction in front of the light source 4, and 10 indicates a series of recesses in the longitudinal direction in which a plurality of light sources 4 are provided.

A plurality of light sources 4 are placed in a series of recesses 10 provided in the longitudinal direction at the back corner of the bottom of the light emitting body 1', and the direction of the light path is determined by the recesses 10 and the light shielding plate 8'. By attaching the light, the light travels from the bottom to the top while being reflected along the reflective surface 7'.
The light travels to the light emitting surface 2 while being refracted and reflected within the diffusing agent 3. In this way, the light source 4 is provided in a series of recesses 10 in the longitudinal direction, and a series of light shielding plates 8' are formed in the longitudinal direction in front of the recesses 10, so that light is emitted in a short distance direction. The light travels in a long-distance direction, and by passing through the diffusing agent 3, the light is sufficiently diffused. Furthermore, the light that goes around the plurality of light shielding plates in the conventional example shown in FIG. , more uniform brightness can be obtained on the light emitting surface.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a light-emitting body whose light-emitting surface is formed of a diffusion sheet and filled with a diffusing agent, a recessed portion formed in a series in the longitudinal direction inside the light-emitting body, and A plurality of light sources placed in the recess, and a plurality of light sources arranged in a series in the longitudinal direction near the recess in front of the light emitting surface of the light source so as not to lead light from the light sources to the light emitting surface through the shortest distance. Since the configuration includes a light shielding plate and a reflective surface formed of a curved surface that is provided behind the light source and reflects light, there is an effect that substantially uniform brightness can be obtained on the light emitting surface.

[Brief explanation of drawings]

1 and 2 are a front view a and a side sectional view b showing a conventional surface light emitter, and FIG. 3 is a front view and a sectional view showing a surface light emitter according to the present invention. In the figure, 1 is a light emitter, 2 is a light emitting surface, 3 is a diffusing agent, 4 is a light source, 5 is a printed circuit board, 6 is a diffusion sheet, 7 is a reflective surface, 8 is a light shielding plate, 9 is a light stripe,
10 is a recessed portion. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

[Claims]

1 At least the outermost strand of the stranded wire is made up of segment wires, and by mixing and twisting the wires with larger and smaller bulks in the radial direction of the wire, symmetrical pairs are formed on the outer peripheral surface of the stranded wire. A low wind noise electric wire having a step surface formed in a spiral shape is configured such that a joint of the strands forming the high step surface is located approximately in the center of the circumferential width of the high step surface. Low AN type low wind noise electric wire.

Claims (1)

[Claims] 1. A light-emitting body whose light-emitting surface is formed of a diffusion sheet and filled with a diffusing agent, a recess formed in a series in the longitudinal direction inside the light-emitting body, and a plurality of recesses placed in the recess. a light source, a light blocking plate connected in a series in the longitudinal direction near the recessed portion in front of the light emitting surface of the light source so as not to lead light from the light source to the light emitting surface in the shortest distance; and behind the light source A thin surface light emitting body comprising a reflective surface formed of a curved surface that reflects light.