An LED illumination unit uses a first reflector (204) comprising a reflecting surface (210) formed as a surface of revolution about a first revolution axis (212).
Each flexible leaflet (2) forms part of a surface of revolution having its axis of revolution substantially orthogonal to the direction of blood flow through the valve (1).
In one embodiment, the convex surface is a conical curve of spherical or parabolic surface of revolution, coated with a reflective optical coating.
Furthermore, the displacer is substantially symmetrical about any plane through its vertical axis and it has an outer surface which is a surface of revolution.
The inner surface (21) of the bush (8) is a surface of revolution with diameter just larger than the piston (3).
This is achieved by providing complementary surfaces of revolution (54, 56) about their overlapped bolt receiving apertures (30, 32).
According to the angle of the inclination to the axle of the motor, the diodes column, describes a revolution surface which can be cylindrical, conical or circular ring.
A reflector (146) for a flashlight includes at least a portion which comprises a surface of revolution of a curve.
The other housing typically has a pair of spaced notches (26) in the housing at a corresponding distance from and substantially parallel to the axis of its surface of revolution.
Devices are disclosed herein which may comprise an EUV reflective optic having a surface of revolution that defines a rotation axis and a circular periphery.
On the surface of revolution there are helical rail grooves which can be engaged with rollers (3-1, 3-2).
According to the invention, the OLED layer and at least one electrode layer are attached to the inner side of a dimensionally stable rotation surface serving as the carrier.
The casing (12) includes a first inclined surface of revolution (24) extending at an acute angle to an axis of the coupler.