Illuminating device

Abstract

In an illuminating device, an optical part used for subjecting light form an LED to light distribution control is enabled to correspond to variation of a set tatami number, uneven illumination cannot be caused easily and therefore beautiful appearance can be realized. The illuminating device (1) is provided with a device main body (2), LED groups (3a-3c) formed by arranging a plurality of LEDs (3) into round rings, and the optical part (4) used for controlling light distribution of light emitting from the LEDs (3). The LED group (3a-3c) are arranged into concentric round rings with the device main body (2) central part as the center, the optical part (4) is provided with a tubular lens (4a) and a plurality of single lenses (4b), the tubular lens (4a) covers the LEDs (3) forming the LED groups (3a, 3b), the plurality of single lenses (4b) are used for respectively covering the LEDs (3) forming the LED group (3c) in an individual manner, and the single lenses are selectively arranged according to line units of the LED groups. According to the structure, the variation of the tatami number can be responded by changing the number of LEDs (3) in the LED groups covered by the tubular lens (4a), uneven illumination cannot be caused easily in the LED groups provided with the single lenses (4b) and therefore beautiful appearance can be realized.

Description

technical field [0001] The present invention relates to lighting fixtures using light emitting diodes (LEDs) as light sources. Background technique [0002] Light-emitting diodes (hereinafter referred to as LEDs) are capable of high-intensity light emission with low power consumption and have a long life, so they are attracting attention as light sources for lighting fixtures that replace incandescent lamps, fluorescent lamps, and the like. As a lighting fixture using LED as a light source, for example, a chandelier (ceiling light) mounted on a ceiling or the like is widespread. In such a chandelier, a plurality of LEDs are arranged in a ring shape instead of a conventional ring-shaped fluorescent lamp, and by appropriately controlling the lighting state of each LED, the brightness and irradiation range of illumination light can be varied. [0003] However, since the light emitted by the LED has a strong directivity, when the LED is used as a light source of a chandelier, t...

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Problems solved by technology

[0006] However, although the tubular lens used in the lighting fixture described in the above-mentioned Patent Document 1 can control the light distribution of the section in the radial direction from the center of the fixture to a large angle, it cannot control the cross-section in the direction perpendicular to the above-mentioned radial direction. light distribution

Therefore, for example, when the number of LEDs contained in one LED group is small and the arrangement intervals of the LEDs are wide, the light distribution of the light emitted in the direction along the ring may not be controlled to a large angle. Illumination unevenness occurs on the illuminated surface due to the light emitted from the tube lens

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