U.S. Philips Corporation

Cornelis M Beijersbergen Van Henegouwen

Robertus J Verhoeven

Cornelis Ouwerkerk

Cornelius Antonius Hezemans

Johannes C Muller

Johannes M Hensing

Karel G Koken

Johannes T Van De Veerdonk

Petrus J Blankers

Wilhelmus J Rath

Pieter A Schoneveld

Gerardus I Elders

Leo G Metzemaekers

Cornelius Ouwerkerk

An apparatus having a frame (1) carrying a turntable (3) for supporting the information carrier, which turntable is rotatable about an axis of rotation (3A), a slide (9), which is movable between two end positions, with a scanning unit, guide spindles (5, 7) and a linear motor unit (17, 19) for the slide, and an electrically energizable clamping unit (21). In the non-energized condition the clamping unit clamps the slide in any arbitrary stationary position of the slide along its path and in the energized condition it does not clamp the slide. During operation of the device a control unit at least substantially simultaneously turns on a first energizing current to the motor drive unit and a second energizing current to the clamping unit at the beginning of a displacement of the slide and at least substantially simultaneously turns off the first energizing current and the second energizing current at the end of the displacement.

Looking slide drive for a disc scanner

A cassette accommodates an information disc (1) which is rotatable inside a housing (2) and which can be read by means of a pick-up which is movable over the disc surface through an aperture (6) in a main wall (3). To enable the information disc to be exchanged rapidly and conveniently, the disc receiving space in the housing is readily accessible in that a shutter (16), which includes at least one of the transverse walls (4, 5, 17) of the housing, can be moved to an open position.

Cassette with removable disc

A disc cassette (1) has an outer case (4) with a front opening which is closed by a shutter (8) and latched in the case by a movable latching device. The apparatus has a device to release the shutter of an inserted disc cassette and with the aid of a withdrawal mechanism withdraws the shutter from the case when the case is withdrawn from the apparatus. The movable latching device for latching the shutter (8) in the case (4) comprises a movable part (14) of the case, and the release device of the apparatus comprises an insertion element (18A, 18B) which penetrates between the shutter and the case when the loaded disc cassette is inserted, thereby moving the movable part of the case to a free position in which the shutter is no longer latched in the case.

Combination disc cassette and apparatus for removing disc therefrom

A cassette contains an information disc arranged to be rotatable in the space inside the cassette and has an opening in a main wall of the housing to provide access to the disc surface for a pick-up. In order to minimize the area of the opening, while maintaining a wide field of use for the cassette, the opening is arranged asymmetrically relative to a radius of the disc.

Cassette having an information disc

A helical scan head drum assembly includes upper and lower drums having an aligned guide surface. The upper and lower drums can be easily separated from each other to install or replace a head support between the drums, and reassembled without loss of alignment of the circumferential guide surface. Each drum has three positioning elements formed in a wall portion, arranged such that the positioning elements of the two drums engage each other pairwise to form a statically defined alignment of the two drums. The fixing element presses the two drums together at the location of the positioning elements to fix them in place.

Helical scan type apparatus with readily aligned scanning unit

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Eindhoven, Netherlands

Cornelis M Beijersbergen Van Henegouwen