Robert Boschgmbh

Pierre Jeannin

Roland Cochard

Willy Buchs

Gerhard Meixner

Christian Lietar

Dieter Baas

Patrick Maillard

A coupling between the handle () and the machine housing () of a hand power tool having the greatest possible vibration damping is produced by the fact that the handle () is coupled with the machine housing () via two or more parallel levers () situated nearly perpendicular to the longitudinal axis () of the hand power tool, whereby the levers () are hinge-mounted on the machine housing () on the one hand and on the handle () on the other hand.

Hand tool machine comprising a vibration-dampened handle

A playback apparatus for a storage disc permits improved damping of vibration of the storage disc normal to the plane of the disc. The playback apparatus includes a first disc and a second disc, where the storage disc can be positioned between the first disc and the second disc. A predetermined distance is provided between the storage disc and the first disc within a predetermined area. The area and the distance are selected so that when there is vibration of the playback at apparatus approximately normal to the plane of the disc with an acceleration not exceeding a predetermined value, there results an amplitude of a resulting vibration of an outside edge of the storage disc in relation to a mid point of the storage disc which is below a predetermined value.

Playback apparatus for a storage disc

A method is proposed which serves to control the focusing of a light beam, aimed at a rotating recording medium (,) for reading data, of a scanner (,) onto the recording medium (,) and the guidance of the light beam along the data tracks of the recording medium (,), each by means of a respective control circuit. The scanner (,) and the recording medium (,) are mounted on a fundamental substrate (,) in at least one housing (,), and the at least one housing (,), together with the fundamental substrate (,), the scanner (,) and the recording medium (,), forms a coupled mechanical oscillator, which is vibrated as a function of a vibration spectrum (,); the scanner (,) is accelerated by the vibration and a relative motion of the recording medium (,) with respect to the scanner (,) is effected, and the amplitudes of the relative motion and the accelerations have a frequency response. The masses, spring constants and damping values of the scanner (,), the recording medium (,), the fundamental substrate (,), and the at least one housing (,) are selected such that the frequencies at which the amplitudes of the relative motion of the recording medium (,) relative to the scanner (,) and the accelerations acting on the scanner (,) are maximal are located in a frequency band of the respective control circuit in which an amplification is performed, and the maximum values of the amplitudes in that frequency band do not exceed a predetermined value.

Method of regulating the focusing and guiding of a light beam

The angular speed measuring device has two acceleration sensors mounted on a circular plate rotating about a first rotation axis and each sensor generates a signal depending on a Coriolis force produced when it rotates about two additional rotation axes. The rotation axes are orthogonal and the acceleration sensors are at least partially made of silicon and displaced by 180.degree. on the planar plate. An initial signal processing device is mounted directly on a circular planar plate on which the acceleration sensors are mounted. A light emitting diode is used to transmit the signals from the initial signal processing circuit to a signal processing circuit off the planar plate via a photodiode receiving device.

Angular speed measuring device

Compensation scale for measuring the weight or mass of an object

Small reference marks near two corners of a circuit chip in the form of optical gratings in which the grating lines of both reference marks are parallel are illuminated alternately by a laser beam which is projected in the location the reference marks would have if the chip is properly located. Detectors are arranged to pick up the first secondary maximum of each diffraction pattern when the chip is properly located on its carrier plate. Failure of the detectors to respond indicates a chip that must be removed. With a beam-splitting arrangement producing four closely bunched light spots, straddling each of the reference marks, and an appropriate number of detectors, directional error signals are obtainable by which mechanical correction movements can be controlled for automatic localization of the chip. The gratings may be produced at the same time as the integrated circuit as among the surface features of the chip or they may be impressed into the solder beads at the corners of the chip by which the chip is made fast to the carrier plate.

Growing community of inventors

Morges, Switzerland

Pierre Jeannin