Phonograph record detecting arrangement
First Claim
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1. Apparatus for use in detecting the presence of a disc record on a turntable, including means comprising a source of energy and means for detecting the energy from said source, the arrangement being such that at least a part of a path for the energy set up between the source means and the detector means is in a region adjacent the surface of the turntable on which the the record rests, and that the path is modified by the presence of a disc record on the turntable.
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Abstract
The presence and size of a recorded disc on a turntable is detected and indicated by the interruption of a beam or beams of energy which passes in the plane of the disc, through a hole or holes in a turntable, or beneath the turntable.
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Citations
12 Claims
- 1. Apparatus for use in detecting the presence of a disc record on a turntable, including means comprising a source of energy and means for detecting the energy from said source, the arrangement being such that at least a part of a path for the energy set up between the source means and the detector means is in a region adjacent the surface of the turntable on which the the record rests, and that the path is modified by the presence of a disc record on the turntable.
- 2. Apparatus for use in detecting the presence of a disc record on a turntable, including a source of energy and a detector of the energy, the arrangement being such that a path for the energy is set up between the source and the detector, the path being modified by the presence of a disc record on the turntable, said path having a straight portion lying in the plane of a disc on the turntable.
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6. Apparatus for use in detecting the presence of a disc record on a turntable, including a source of energy and a detector of the energy, the arrangement being such that a path for the energy is set up between the source and the detector, that the path is modified by the presence of a disc record on the turntable, wherein the turntable defines a hole so arranged that the association of energy intercepting means with the hole can be used to modify the said energy path according to whether or not a disc is present on the turntable, said source and the detector both being located on the side of the plane in which the turntable lies opposite to that on which a record is located and a disc record, when present on the turntable, provides the energy intercepting means and causes a reflectivity to be presented to energy from the source passing through the hole which is different from that presented by the turntable.
- 8. Apparatus for use in detecting the presence of a disc record on a turntable, including a source of energy and a detector of the energy, the arrangement being such that a path for the energy is set up between the source and the detector, the path being modified by the presence of a disc record on the turntable, the turntable defining a hole so arranged that the association of energy intercepting means with the hole can be used to modify the said energy path according to whether or not a disc is present on the turntable, said turntable defining a plurality of the said holes, each at a different distance from the centre of the turntable, a respective associated means is provided in each hole for use in detecting a different size of disc record, and an insert having an energy reflecting wall in a hole.
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9. Apparatus for use in detecting the presence of a disc record on a turntable, including a source of energy and a detector of the energy, the arrangement being such that a path for the energy is set up between the source and the detector, the path being modified by the presence of a disc record on the turntable, the turntable defining a hole so arranged that the association of energy intercepting means with the hole can be used to modify the said energy path according to whether or not a disc is present on the turntable, said hole defined by the turntable being a radially extending slot in the surface of the turntable, including detector means to detect the length of the said slot which is covered when a disc record is present on the turntable, thereby to enable a measure of the diameter of the record to be provided.
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10. Apparatus for use in detecting the presence of a disc record on a turntable, including a source of energy and a detector of the energy, the arrangement being such that a path for the energy is set up between the source and the detector, the path being modified by the presence of a disc record on the turntable, and means for labelling the energy from the source whereby stray or ambient energy of the same type can be discriminated against.
Specification