Nonrecorded section detection in an automatic record
AssigneeSharp Kabushiki Kaisha
InventorHiromi Juso
Life of this patent
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Abstract
A nonrecorded section detection sensor is mounted on a sensor arm which is rotatable around a shaft, to which a drive mechanism is connected to scan the nonrecorded section detection sensor above a disc. A slit plate is fixed to the shaft to detect the rotation of the shaft, whereby the address of a nonrecorded section provided between two adjacent tracks recorded on the disc is detected. Another slit plate is fixed to a tonearm drive shaft to detect a current address of a pickup cartridge mounted on a tonearm. A control circuit functions to locate the pickup cartridge at a beginning position of a selected track through the use of information related to the addresses of the nonrecorded section and the pickup cartridge.
Claims14
An automatic record player comprising:
- a tonearm;
- a pickup cartridge mounted on a tonearm;
- a first drive mechanism for rotating said tonearm to place said pickup cartridge at a desired position;
- cartridge position detection means for detecting a current address of said pickup cartridge;
- a nonrecorded section detection sensor for detecting a nonrecorded section provided between two adjacent tracks recorded on a disc;
- a sensor arm for supporting said nonrecorded section detection sensor;
- a second drive mechanism for rotating said sensor arm to scan the disc surface by said nonrecorded section detection sensor;
- a nonrecorded section position information storing means for storing an address of said nonrecorded section detected by said nonrecorded section detection sensor;
- and
- adjusting means for adjusting the initial contents of said nonrecorded section position information storing means.
An automatic record player comprising:
- a tonearm;
- a pickup means mounted on the tonearm;
- a first drive means for rotating said tonearm to place said pickup means at a desired position;
- a nonrecorded section detection sensor for detecting a nonrecorded section provided between two adjacent tracks recorded on a disc;
- a sensor arm for supporting said nonrecorded section detection sensor, said sensor arm being separate from said tonearm;
- a second drive means for rotating said sensor arm to scan the disc surface by said nonrecorded section detection sensor, the rotation of said sensor arm being performed without regard to the rotation of said tonearm;
- a cartridge position detection means for detecting a current address of said pickup means and a nonrecorded section position information storing means for storing an address of said nonrecorded section detected by said nonrecorded section detection sensor, said cartridge position detection means comprising a first slit plate fixed to a shaft around which said toner arm is rotatable and means for detecting rotation of said first slit plate and wherein said nonrecorded section position information storing means comprises a second slit plate fixed to a shaft around which said sensor arm is rotatable and means for detecting rotation of said second slit plate;
- means for correlating information related to said current address of said pickup means to information related to said address of said nonrecorded section;
- and
- wherein said first slit plate includes slits formed therein at a uniform distance, and said second slit plate includes slits formed therein at non-uniform distances.
An automatic record player comprising:
- a tonearm;
- a pickup means mounted on the tonearm;
- a first drive means for rotating said tonearm to place said pickup means at a desired position;
- a nonrecorded section detection sensor for detecting a nonrecorded section provided between two adjacent tracks recorded on a disc;
- a sensor arm for supporting said nonrecorded section detection sensor, said sensor arm being separate from said tonearm;
- a sensor drive means for rotating said sensor arm to scan the disc surface by said nonrecorded section detection sensor, the rotation of said sensor arm being performed without regard to the rotation of said tonearm;
- means for correlating information related to the current address of said pickup means to information related to the address of said nonrecorded;
- and
- adjusting means for adjusting the initial contents of said nonrecorded section position information storing means.
Dependencies are inferred from the claim text.