Device for controlling recording track jump operations

Claim 2

A recording track jump controlling device for controlling the movement of a data detecting spot from one recording track to another recording track on a recording disk in response to a jump instruction signal and a preset value of the number of tracks to be traversed, comprising: a counter for storing the preset value; means for generating a track signal each time said data detecting spot traverses a recording track; means for decrementing said counter responsive to each of said track signals generated as said data detecting spot traverses said recording tracks in a first direction; means for detecting the reversal of the direction of the traverse of said recording tracks by the data detecting spot and for incrementing said counter responsive to each of said track signals generated as said data detecting spot traverses said recording tracks in the reverse direction; and means for producing data detecting spot positioning signals in accordance with the value stored in said counter .

Claim 3

A device according to claim 1, wherein said detecting and incrementing means comprises: a return detection circuit for setting said counter to an up count mode in response to the traverse of the data detecting spot in said reverse direction; and a quasi-signal count generation circuit for supplying a count signal to said counter in response to each track signal generated when said counter has been set to said up count mode by said return detection circuit .

Claim 4

A device according to claim 2, further including a judgement circuit connected to said counter for terminating the production of said data detecting spot positioning signals responsive to said counter storing a zero value.

Claim 5

A device according to claim 2, wherein said data detecting spot positioning means comprises a jump signal generating circuit for generating said positioning signals at a first frequency when the value stored in said counter is greater than a preselected value and for generating said positioning signals at a second frequency less than said first frequency when the value stored in said counter is less than or equal to said preselected value.

Claim 6

A device according to claim 4, further including a count content judging circuit for controlling said jump signal generating circuit to generate said positioning signals at said first frequency when the value stored in said counter is greater than said preselected value and at said second frequency when said value stored in said counter is less than or equal to said preselected value.

Claim 7

A device according to claim 2, wherein said data detecting spot positioning means comprises a jump signal generating circuit for generating said positioning signals at a decreasing rate as said data detecting spot is traversed closer to the another recording track.

Claim 8

A recording track jump controlling device for controlling the traverse in a first direction of a data detecting spot (T l ) from a present recording track (T ) to a target recording track on a recording disk ' including other recording tracks intermediate the present recording track and the target recording track, the device comprising; a counter for initially storing a value corresponding to the number of recording tracks that must be traversed to position the data detecting spot on the target recording track from the present recording track; means for generating a track signal each time said data detecting spot traverses a recording track during movement from the present recording track to the target recording track; means for decrementing said counter responsive to each of said track signals generated as said data detecting spot traverses said recording track in the first direction; means responsive to the value stored in said counter for determining if said data detecting spot has overshot the target track and for generating a traverse reversal signal in response thereto; a jump signal generator circuit for producing track jump signals in response to the value stored in said counter , said track jump signals having a first polarity when said data detecting spot is traversing said recording tracks in the first direction and a second polarity in response to said traverse reversal signal; and means responsive to said traverse reversal signal for incrementing the value stored in said counter responsive to the simultaneous occurrence of said track signal and said traverse reversal signal.

Claim 9

A recording track jump controlling device for controlling the traverse in a first direction of a data detecting spot (T l ) from a present recording track (T ) to a target recording track on a recording disk ' including other recording tracks intermediate the present recording track and the target recording track, the device comprising; a counter for initially storing a value corresponding to the number of recording tracks that must be traversed to position the data detecting spot on the target recording track from the present recording track; means for generating a track signal each time said data detecting spot traverses a recording track during movement from the present recording track to the target recording track; means for decrementing said counter responsive to each of said track signals generated as said data detecting spot traverses said recording track in the first direction; means responsive to the value stored in said counter for determining if said data detecting spot has overshot the target track and for generating a traverse reversal signal in response thereto; a jump signal generator circuit for producing track jump signals in response to the value stored in said counter , said track jump signals having a first polarity when said data detecting spot is traversing said recording tracks in the first direction and a second polarity in response to said traverse reversal signal; and means responsive to said traverse reversal signal for incrementing the value stored in said counter responsive to the simultaneous occurrence of said track signal and said traverse reversal signal.

Claim 10

A recording track jump controlling device as hereinbefore described with reference to the accompanying drawings.

Claim 11

A recording track jump controlling device as hereinbefore described with reference to the accompanying drawings.