Lighting device and lighting apparatus provided with lighting device

Abstract

A lighting device (10) comprises cylinder-shaped convex lenses and groups of prisms each of which is comprised of a plurality of prisms, on a plane of incidence of an optical member (1), and groups of prisms (4a, 4b) each of which is comprised of a plurality of prisms having different shapes, on a plane of emergence (1a) of the optical member (1). The group of prisms (4a) formed on the plane of emergence (1a) is made so that light beams with strong intensities to be radiated in a normal direction with respect to a substrate face are deflected in directions greatly inclined with respect to the normal direction, through reflections within the prisms. Accordingly, a lighting device (10) the construction of which is simple and the luminous intensity distribution characteristic of which can be controlled is able to be offered.

Description

technical field [0001] The present invention relates to lighting equipment and lighting devices capable of controlling light distribution characteristics with a simple structure, in particular to lighting devices such as street lamps, security lights, and street lamps with high illuminance and wide light distribution characteristics, and lighting devices suitable for the above-mentioned lighting. Installation of lighting equipment. Background technique [0002] A plurality of lighting devices are installed outdoors for traffic safety, crime prevention, and the like. [0003] For example, in order to enable the driver to reliably grasp the state of the road and prevent the visibility from being hindered by the light from the lighting device while driving, the average brightness, uniformity of brightness, and glare of the illuminated road are stipulated for street lamps. evaluation value. [0004] In many cases, street lamps are usually used with an installation height of 7m...

AI Technical Summary

Problems solved by technology

[0013] In such a case, as in the lighting device described in Patent Document 1, there is a problem that if the light distribution is controlled using a reflector, light enters the reflector from various directions, so it is difficult to set the shape.

In addition, in order to avoid the above-mentioned problems, when the area of ​​the reflector and the prism is increased and the ratio of the area of ​​the light source is reduced, the problem of increasing the size of the lighting device will arise.

[0014] In addition, the lighting device described in Patent Document 2 reduces the size of the device by providing a reflector for each light source, but increases the number of components.

[0015] In addition, although the lighting device described in Patent Document 3 can widen the angle of light at the outer edge of the light source by using a concave lens, it cannot widen the angle of light at the central region of the light source.

Therefore, the lighting device of Patent Document 3 cannot sufficiently control the light distribution characteristics.

[0016] In addition, in lighting devices installed on roads, etc., it is important to control the light distribution on two surfaces parallel to the direction of travel of the road and the width direction, but the method of mounting the light source body becomes complicated, which becomes a problem that increases manufacturing costs. main reason

Images