Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
160 words
A tracking servo device for controlling a relative position in the radial direction of a disc-shaped recording medium between an information reading point of a pick-up and a recording track on said medium in response to a tracking error signal produced in accordance with an offset of said relative position, said tracking servo device comprising: means for detecting when said tracking error signal exceeds a reference level; means for producing first and second error signals, said first and second error signals following in waveshape said tracking error signal and being respectively in-phase with and 180° out of phase with said tracking error signal; means for alternately selecting one of said first and second error signals; and means for controlling said selecting means in response to an output of said detector means in a jumping operation, whereby a jumping operation over said recording track by said information reading point is controlled in response to an output signal of said selecting means.
Claim 2
Dependent Claim
160 words
A tracking servo device for controlling a relative position in the radial direction of a disc-shaped recording medium between an information reading point of a pick-up and a recording track on said medium in response to a tracking error signal produced in accordance with an offset of said relative position, said tracking servo device comprising: means for detecting when said tracking error signal exceeds a reference level; means for producing first and second error signals, said first and second error signals following in waveshape said tracking error signal and being respectively in-phase with and 180° out of phase with said tracking error signal; means for alternately selecting one of said first and second error signals; and means for controlling said selecting means in response to an output of said detector means in a jumping operation, whereby a jumping operation over said recording track by said information reading point is controlled in response to an output signal of said selecting means.
Claim 3
Dependent Claim
53 words
The tracking servo device of claim 1, wherein said means for producing said first and second error signals comprises a first operational amplifier to an inverting input terminal of which said tracking error signal is applied, and a second operational amplifier to a noninverting input of which said tracking error signal is applied.
Claim 4
Dependent Claim
18 words
The tracking servo device of claim 2, further comprising level clamping means coupled to said second operational amplifier.
Claim 5
Dependent Claim
32 words
The tracking servo device of claim 3, wherein said level clamping means comprises a pair of back-to-back coupled diodes coupled between an output of said second operational amplifier and said selecting means.
Claim 6
Dependent Claim
37 words
The tracking servo device of claim 1, wherein said selecting means comprises a switch having input terminals receiving said first and second error signals, and a control input coupled to receive an output of said controlling means.
Claim 7
Dependent Claim
20 words
The tracking servo device of claim 1, further comprising means for producing a trigger pulse for setting an initial direction.