CPC F21S 8/026 (2013.01) [F21V 21/26 (2013.01); F21V 23/0457 (2013.01); F21Y 2115/10 (2016.08)] | 8 Claims |
1. A ceiling-mounted type lighting device, comprising:
a light-receiving unit containing four optical sensors arranged crosswise and a light-shielding body through which four through-holes are cut as positions that are respectively opposite to light-receiving surfaces of the optical sensors; and
a tilt adjustment mechanism containing a first movable body and a second movable body which are mounted on first and second rotation shafts arranged on a same plane to cross at right angles,
wherein the light-shielding body is arranged so as to be opposite to the optical sensors with a clearance between the light-shielding body and the optical sensors,
wherein a single tilt adjustment light emitted from a light emitter passes through the through-holes to form four spotted tilt adjustment lights which are respectively concentrated on the sensors,
wherein the tilt adjustment mechanism is mounted in a housing constituting the ceiling-mounted type lighting device, and
wherein the light-receiving unit and a lighting lamp illuminating a side of the light emitter are mounted on a rotational center axis of the second movable body, and a tilt of the light-receiving unit is adjusted according to amounts of the four spotted tilt adjustment lights formed on the optical sensors.
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