Abstract: A multi-source shadowless operating lamp is disclosed, which includes a central base, a link element received in the central base, and a plurality of spotlights mounted on a peripheral of the central base and spaced a distance apart from each other. A light field is defined below the central base and extends perpendicular to the central base. Each spotlight defines a light focus spot through the light field. The focus spots exactly pass the same height in the light field. Each spotlight includes a lamp shell connecting with the central base, a dissipation substrate accommodated in the lamp shell, and a plurality of LED sets. The LED sets at different positions respectively cast light to the focus spot of the spotlight. An angle between the dissipation substrate and the light shell is adjustable to change position of the focus spot of the spotlight relative to the light field.

Abstract: An operating lamp includes a center optical system, and a plurality of side optical systems. Each of the optical systems includes a plurality of light sources. Each of the light sources includes a condensing lens and an LED. When the positions of the condensing lens with respect to the LEDs are adjusted, the operating lamp is still able to generate a light field of a substantial Gaussian distribution. Thus the light intensity corresponding to the center of the operating lamp can still be optimized even when the light field is increased or decreased.

Abstract: A rotary valve assembly has a valve body, a rotor and a plurality of guidance check valves. The valve body includes a valve seat longitudinally defining a bore through a center thereof. A plurality of valve oil passages and a main oil passage are respectively distributed radially around the bore. The rotor is movably received in the bore of the valve body. A plurality of guidance check valves is mounted in the valve oil passages. The rotor rotates to switch to a predetermined valve position by manual operation or electric power, where a predetermined oil supply path is precisely formed to supply oil to a predetermined valve communicating with a valve oil passage.