U.S. Philips Corporation

Koninklijke Philips Corporation N.v.

Joannes Gregorius Bremer

Adrianus Petrus Johanna Maria Rommers

Paraskevas Dunias

Gillian Antoinette Mimnagh-Kelleher

Wilhelmus Lambertus Marinus Cornelius Verhoeven

Josephus J Braat

Klaas Compaan

Hendrik Renes

Johannes W Bosch

An activity monitor is provided that reduces the amount of power consumed during a monitoring operation.

Activity monitoring

An activity monitor is provided that can be cheaper and require lower power than existing activity monitors. A single output channel from a plurality of motion sensors is provided and monitored intermittently.

A measuring device for determining the displacement of a movable object includes a graduation element which is mechanically connected to the object whose displacement is to be determined. The graduation element comprises at least a track which is formed by a plurality of successive grating strips located transversely to the direction of movement of the object. The measuring device also includes a radiation source, a detector and a reflective optical system which comprises at least a beam collimating element. The reflective optical system guides the radiation from the radiation source to the graduation element and changes it to an elongate radiation beam which is parallel on average in the cross-section perpendicular to the grating strips.

Measuring device for determining the displacement of a movable object

The measuring device (1) comprises a scale graduation element (3) provided with a number of tracks (9, 13), a pick-up device (5) which comprises a number of sensing elements (4, 6) provided with sensors, which number corresponds to the number of tracks (9, 13), and also comprises a signal processing system (7). The tracks (9, 13) include an incremental track (9) and an absolute track (13). Both tracks are formed as a succession of strip-shaped parts (11, 15), each of which has a property which can be detected by the sensors of the sensing elements (4, 6). This property is dependent on the location on the scale graduation element (3). This property is preferably bivalent. In the signal processing system (7) signals originating from the sensing element (4) associated with the incremental track (9) and signals originating from the sensing element (6) associated with the absolute track (13) are combined. On the absolute track (13) the property is distributed in a pseudo-random fashion between the strip-shaped parts (15) so that the combination of signals for a pitch (17) of the incremental track (9) produces a specific value for each pitch (17). Consequently, the measurement value produced by the signal processing system (7) is absolute.

Measuring device for determining an absolute position of a movable

An optical measuring system for determining angular displacements of an object, including a radial grating connected to the object. Optical elements including two straight-line-generatrix surfaces focus the grating image as a parallel grating image onto a linear array radiation-sensitive detection system. The linear array may be photodiodes functioning as a grating-like element.

Shaft encoder with an optical system comprising two

A device is described for determining the linear displacement of a machine tool component with the aid of a grating which is mechanically connected to the component, which grating is disposed in the light path between a light source and a light-sensitive element which converts the incident light into an electric signal. The light-sensitive element is a multiple photo-cell which consists of a row of line-shaped photo-diodes which by means of an electrical switch are consecutively connected to an electronic circuit which processes the signal which is produced in the photo-diodes.

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Eindhoven, Netherlands

Joannes Gregorius Bremer