Rohm Co., Ltd.

Kohei Mizuta

Masaru Igaki

Hideharu Osawa

Hirotaka Shimizu

Akio Yabugami

Hiroaki Tsujii

Saizo Suzuki

A lighting system includes a main power source, a power switch, a daylight white color light source driver, an incandescent color light source driver, a first light source unit, and a second light source unit. The power switch includes a first terminal connected to the main power source, a second terminal and a control terminal. The two drivers are connected to the second terminal of the power switch. The first light source unit is driven by the daylight white color light source driver. The second light source unit is driven by the incandescent color light source driver. A switch driving circuit for applying power-saving switch signals is connected to the control terminal of the power switch, and a signal processing circuit for outputting instruction signals is connected to the switch driving circuit.

Lighting system

A Light Emitting Diode (LED) illumination device having a pleasant appearance and capable of uniform illumination is provided. The LED illumination device () includes a support portion () having a first support surface () and a second support surface (), wherein the first support surface () faces downward, and the second support surface () faces downward, is located at a position higher than the first support surface (), and surrounds the first support surface (); a plurality of LED chips (), including a plurality of first LED chips () supported on the first support surface () and a plurality of second LED chips () supported on the second support surface (); and a mask (), located at a lower position with respect to the support portion (), penetrated by light from the LED chips (), and including a tilted portion () inclining downward toward the center.

LED illumination device

An LED lightbulb is configured to properly illuminate a broader region. The LED lightbulb includes a light emitting unit, a pedestal, a power source unit, a heat dissipator, a base, and a globe swelling toward one side in a first direction for enclosing the light emitting unit. The globe is configured to diffusingly transmit light from the light emitting unit. The light emitting unit provides a light amount not less than 50% of the maximum light amount in a region not exceeding &#xb1;60&#xb0; about the central axis extending in the first direction set as 0&#xb0;. The globe provides a light amount not less than 50% in a region exceeding &#xb1;125&#xb0; about the central axis set as 0&#xb0;.

LED lightbulb

The present invention provides an LED bulb, which includes a light source portion including at least one LED chip); a housing including a bottom portion supporting the light source portion and a sidewall portion surrounding the light source portion, and opening at one side of a first direction; a base disposed on the other side of the first direction relative to the housing; and a light guide body disposed in a space surrounded by the sidewall portion, and including an incident surface facing the light source portion, a light-emitting surface for making the light from the incident surface emit toward the one side of the first direction, and a peripheral side surface located between the incident surface and the light-emitting surface, wherein the cross-sectional area of the peripheral side surface becomes increasingly larger from a side of the incident surface toward a side of the light-emitting surface.

LED bulb

An LED lighting apparatus includes a support unit including a support surface facing an illumination side, a plurality of LED chips supported on the support surface, and a cover that covers the support surface and transmits light from the LED chips. The cover includes a periphery which, as viewed in plan, includes four first sides that are spaced apart from each other and four second sides each connecting ends of adjacent ones of the first sides. The first sides consisting of two pairs of parallel sides, and each of the first sides constituting one of the two pairs and each of the first sides constituting the other one of the two pairs form a right angle. Each of the first sides and each of the adjacent second sides form an obtuse angle.

Growing community of inventors

Kyoto, Japan

Kohei Mizuta