U.S. Philips Corporation

Koninklijke Philips Corporation N.V.

Jelm Franse

Robert C Boereboom

Anthonie Hendrik Bergman

Bernd Ackermann

Peter Hubertus Franciscus Deurenberg

Johannes C Muller

Hubertus Maria Rene Cortenraad

Leonardus P Tielemans

Ekkehard Bolte

Ping-Shih Wang

Anton Hammers

Carel J Thijsse

Klaus Stips

Ronny Verzijl

A lighting arrangement provides light of a desired color. The arrangement includes light sources that each emit light of a respective color that, when mixed, is perceivable as the desired color. A light detector is configured to receive light reflected by a color reference surface having a specific reference color. A controller is configured to analyzes a signal from the light detector and recognizes the color of the received light as the color of the reference surface. The controller controls the light sources such that the desired color corresponds to the color of the color reference surface.

Lighting system for color control

A dynamic groove bearing (9, 83, 95) with an inner bearing pan (15) and an outer bearing part (17) which is rotatable about the inner bearing part (15). The bearing parts (15, 17) are provided with cooperating bearing surfaces (23, 35) between which a bearing gap (45) is present filled with a liquid lubricant (75). The bearing surface (35) of at least one of the bearing pans (17) is provided with a pattern of grooves (51, 53). The outer bearing part (17) has an annular barrier (69, 87, 99) which is raised with respect to the bearing surface (35) of the outer bearing part (17) and which bounds the bearing gap (45). The barrier (69, 87, 99) prevents leakage of the liquid lubricant (75) from the dynamic groove bearing (9, 83, 95) at comparatively high rotation speeds of the dynamic groove bearing (9, 83, 95). The dynamic groove bearing (9, 83, 95) can be used in an electric motor (1, 81, 93) of a data storage unit (113) in which an information disc (115), for example a hard disk of a computer, can be rotated relative to a scanning unit (121) with a magnetic head (123) by the electric motor (1, 81, 93).

Dynamic groove bearing with a lubricant barrier

An improved spindle motor, particularly for a hard-disc drive, having a stator in the form of a cylindrical coil carried by a mounting plate and a permanent magnet rotor carried on a rotatable hub. At its outer circumference the rotor generates a field perpendicular to the axis of rotation. A bell-shaped portion of the hub surrounds the coil. The hub is supported on the motor shaft by axial and radial hydrodynamic bearings. A soft-iron sleeve-shaped yoke externally surrounds the coil configuration. This permits the coil to be free of soft-magnetic parts, thereby reducing its inductance and improving the dynamic drive characteristics of the motor. The coil is preferably formed by curved foil windings, so there are no winding slots. This avoids the production of detent torques.

Electric motor having a stator and a rotor

A support device (1) with a first bearing part (33) and a second bearing part (51). The first bearing part (33) is in a housing (11), while the second bearing part (51) is provided on a locking piece (53) fastened to the housing (11). Leakage along the locking piece (53) of a fluid present between the bearing parts (33, 51) is prevented by the use of a sealing element (59). The sealing element (59) is provided under pretension between the locking piece (53) and a pressure member (61, 87) fastened to the housing (11), the locking piece (53) bearing on the housing (11) under the influence of the pretension of the sealing element (59). Since the locking piece (53) bears on the housing (11) under the influence of the pretension of the sealing element (59), the locking piece (53) is fixed in an accurate position relative to the housing (11 ). An accurately defined mutual position of the first and the second bearing part (33, 51) is achieved in this manner.

Support device with a uniformly sealing locking-piece, and data storage

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Eindhoven, Netherlands

Jelm Franse