Light source device and illumination device using the same

Abstract

A light source device (3) is provided with an LED (4) having strong directivity, a reflective hood (7) which has an interior reflecting surface for reflecting the illumination light from the light source, and a pair of first and second polarizing reflective plates (9A, 9B) for polarizing the illumination light from the LED (4) in a specific direction. The first and second polarizing reflective plates (9A, 9B) have a specific length and width, and a back surface formed from a high reflectance plate. The light source (4) is secured to the reflective hood (7). A specific interval is provided between the first and second polarizing reflective plates (9A, 9B) and the reflecting surface of the reflective hood, and a specific interval is provided between the two plates with the optical axis passing through the 0 DEG direction angle of the light source (4) in between. That is to say, the respective designated angles alfa of inclination are formed with respect to the optical axis so that the interval in the vicinity of the light source is large, and the interval further away is small.

Description

technical field [0001] The present invention relates to a light source device and a lighting device using the light source device. It is also an illumination device that can obtain uniform planar illumination light on a wide area. These devices can be used as lighting devices in a wide range of fields, such as backlights for liquid crystal panels, various display panels, electronic signboards, and interior lighting for automobiles, trains, and airplanes. Background technique [0002] Among the planar lighting devices, for example, the following lighting device is known: a direct lighting device, in which a diffuser plate composed of a plate-shaped body with a predetermined thickness and area is used, and the diffuser plate is directly below the diffuser plate. A light source such as a fluorescent lamp is arranged, and the light source is used to directly irradiate the diffuser plate to make the surface of the diffuser plate emit light, which is regarded as a backlight for a...

AI Technical Summary

Problems solved by technology

[0003] In these direct-type and edge-lit lighting devices, since the direct-type lighting device has a predetermined gap, that is, a predetermined distance between the light source and the diffuser, there may be a problem that if the distance is shortened, Then the shape of the light source is illuminated on the diffuser plate and becomes ugly, thereby reducing the lighting quality

In addition, if a lighting device with strong directivity of the light source is used, there may be a problem that the brightness of the diffuser plate directly above the light source becomes high, resulting in a brightness difference with other lighting areas, making it difficult to obtain uniform lighting. Light

As a method of making the luminance uniform, increasing the distance between the diffuser plate and the light source is also considered, but if this method is adopted, there is a concern that the whole becomes dark in proportion to the distance of the interval, and the desired brightness cannot be obtained. Illumination light is required, and thinning is not possible, etc.

Since direct lighting devices have such problems, it may be difficult to adopt such direct lighting devices depending on the application.

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