Track access device and tracking control device

Claim 2

A track access device for moving a conversion means for reproducing signals from a recording signals in an information recording medium having tracks wherein information is to be recorded or has been recorded and composed of a first area wherein information is in advance recorded on the track by the presence of pits of rugged structure and a second area wherein information is optically recorded or reproduced on the recording material film on the track from a track where said conversion means is located to another desired track, which comprises: a detection means for detecting the positional relationship on said information recording medium between said conversion means and a track; and an amplification means capable of switching the amplification ratio of amplifying the output of said detection means, said track access device being arranged to switch the amplification ratio of said amplification means at the time point when said conversion means has crossed the boundary between said first area and said second area.

Claim 3

The track access device as claimed in Claim 1, wherein the amplification ratio of said amplification means is changed over in two steps.

Claim 4

The track access device as claimed in Claim 2, wherein the amplification ratio of said amplification means is set so that the amplification ratio when said conversion means is located in the first area is higher than the amplification ratio when said conversion means is located in the second area.

Claim 5

The track access device as claimed in Claim 3, wherein the amplification ratio of said amplification means is arranged so that the output of said detection means generated when said conversion means has crossed a track in the first area becomes approximately equal to the output of said detection means generated when said conversion means has crossed a track in the second area.

Claim 6

The track access device as claimed in Claim 1, wherein a track crossing detection means for detecting that the conversion means has crossed a track or a middle point between adjacent tracks and a counting means for counting the outputs of said track crossing means are provided, and by the reaching a predetermined value of the count value of said counting means, it is detected that said conversion means has crossed the boundary between the first area and the second area.

Claim 7

The track access device as claimed in Claim 5, wherein said track crossing detection means detects that said conversion means has crossed a track or a middle point between tracks based on the signal outputted by the amplification means.

Claim 8

A track access device for moving a conversion device for reproducing signals from or recording signals on an information recording medium having tracks wherein information is to be recorded or has been recorded and composed of a first area wherein information is in advance recorded on tracks by the presence or non-presence of pits of rugged structure and a second area wherein information is optically reproduced or recorded on the film of recording material on the track from a track where said conversion means is located to another desired track, which comprises: a detection means for detecting the positional relationship on said information recording medium between said conversion means and a track; and a binary means capable of switching the hysteresis amount when digitalizing the output of said detection means,said track access device being arranged to switch the hysteresis amount of said binary means at the time point when said conversion means has crossed the boundary between said first area and said second area.

Claim 9

A track access device for moving a conversion device for reproducing signals from or recording signals on an information recording medium having tracks wherein information is to be recorded or has been recorded and composed of a first area wherein information is in advance recorded on tracks by the presence or non-presence of pits of rugged structure and a second area wherein information is optically reproduced or recorded on the film of recording material on the track from a track where said conversion means is located to another desired track, which comprises: a detection means for detecting the positional relationship on said information recording medium between said conversion means and a track; and a binary means capable of switching the hysteresis amount when digitalizing the output of said detection means,said track access device being arranged to switch the hysteresis amount of said binary means at the time point when said conversion means has crossed the boundary between said first area and said second area.

Claim 10

The track access device as claimed in Claim 7, wherein the hysteresis amount of said binary means is changed over in two steps.

Claim 11

The track access device as claimed in Claim 8, wherein the hysteresis amount of said binary means is set so that the hysteresis amount when the conversion means is located in the first area is larger than the hysteresis amount when said conversion means is located in the second area.

Claim 12

The track access device as claimed in Claim 7, wherein a track crossing detection means for detecting that the conversion means has crossed a track or a middle point between tracks and a counting means for counting the outputs of said track crossing detection means are provided, and by the reaching a predetermined value of the count value of said counting means, it is detected that said conversion means has crossed the boundary between said first area and said second area.

Claim 13

The track access device as claimed in Claim 10, wherein said track crossing detection means detects that the conversion means has crossed a track or a middle point between adjacent tracks based on the signal outputted by the binary means.

Claim 14

A track access device including a conversion means for reproducing signals from or recording signals on an information recording medium having tracks where information is to be recorded or has been recorded and composed of a first area wherein information is in advance recorded on tracks by the presence or non-presence of pits of rugged structure and a second area wherein information is optically reproduced or recorded on a film of recording material on a track, and an reference velocity generating means capable of presenting two different target velocity schedules for the first and second areas, respectively, and moving said conversion means from a track wherein said conversion means is located to another desired track at a velocity approximately equal to the target velocity outputted by said reference velocity generating means which is so arranged that the target velocity outputted by said reference velocity generating means is changed over at the time point when said conversion means has crossed the boundary between said first area and said second area.

Claim 15

A track access device including a conversion means for reproducing signals from or recording signals on an information recording medium having tracks where information is to be recorded or has been recorded and composed of a first area wherein information is in advance recorded on tracks by the presence or non-presence of pits of rugged structure and a second area wherein information is optically reproduced or recorded on a film of recording material on a track, and an reference velocity generating means capable of presenting two different target velocity schedules for the first and second areas, respectively, and moving said conversion means from a track wherein said conversion means is located to another desired track at a velocity approximately equal to the target velocity outputted by said reference velocity generating means which is so arranged that the target velocity outputted by said reference velocity generating means is changed over at the time point when said conversion means has crossed the boundary between said first area and said second area.

Claim 16

The track access device as claimed in Claim 12, wherein the target velocity outputted by said reference velocity generating means is changed over in two steps.

Claim 17

The track access device as claimed in Claim 13, wherein the target velocity outputted by said reference velocity generating means is set so that the target velocity generated when said conversion means is located in the first area is smaller than the target velocity generated when said conversion means is located in the second area.

Claim 18

The track access device as claimed in Claim 12, wherein a track crossing detection device for detecting that the conversion means has crossed a track or a middle point between tracks, and a counting means for counting the outputs of said track crossing detection means are provided, and by the reaching a predetermined value of the count of said counting means, it is detected that said conversion means has crossed the boundary between the first area and the second area.

Claim 19

A track access device for moving a conversion means for reproducing signals from or recording signals on an information recording medium having tracks wherein information is to be recorded or has been recorded and composed of a first area wherein information has been recorded in advance by the existence or non-existence of pits of rugged structure and a second area wherein information is optically reproduced or recorded on a film of recording material made on the track from a track where said conversion means is located to another desired track, which comprises a detection means for detecting the positional relationship on said information recording medium between said conversion means and a track;and an offset adding means capable of switching the offset amount to be added to the output of said detection means, said track access device being arranged to switch the offset amount to be added by said offset adding means at the time point when said conversion means has crossed the boundary between said first area and said second area.

Claim 20

A track access device for moving a conversion means for reproducing signals from or recording signals on an information recording medium having tracks wherein information is to be recorded or has been recorded and composed of a first area wherein information has been recorded in advance by the existence or non-existence of pits of rugged structure and a second area wherein information is optically reproduced or recorded on a film of recording material made on the track from a track where said conversion means is located to another desired track, which comprises a detection means for detecting the positional relationship on said information recording medium between said conversion means and a track;and an offset adding means capable of switching the offset amount to be added to the output of said detection means, said track access device being arranged to switch the offset amount to be added by said offset adding means at the time point when said conversion means has crossed the boundary between said first area and said second area.

Claim 21

The track access device as claimed in Claim 16, wherein the offset amount added by said offset adding means is changed over in two steps.

Claim 22

The track access device as claimed in Claim 17, wherein the offset amount to be added by the offset adding means is set so as to be equal to a mount approximately equal to cancel the offset generated in the output of the detection means when said conversion means is located in the first area.

Claim 23

The track access device as claimed in Claim 18, wherein a track crossing detection means for detecting that the conversion means has crossed a track or a middle point between adjacent tracks and a counting means for counting the outputs of said track crossing detection means are provided, and by the reaching a predetermined value of the count of said counting means, it is detected that said conversion means has crossed the boundary between the first area and the second area.

Claim 24

The track access device as claimed in Claim 19, wherein said track crossing detection means is arranged to detect that said conversion means has crossed a track or a middle point between adjacent tracks based on the signal outputted by the offset adding means.

Claim 25

A track access device including a conversion means for signal reproducing from or signal recording on an information recording medium having tracks wherein information is to be recorded or has been recorded and composed of a first area wherein information has been recorded in advance by the existence or non-existence of pits of rugged structure and a second area wherein information is optically recorded or reproduced on the film of recording material formed on the track, and moving said conversion means from a track wherein said conversion means is located from another desired track, which comprises a track crossing detection means for detecting that said conversion means has crossed a track or a middle point between two adjacent tracks; and a counting means for counting the outputs of said track crossing detection means, said track access device being arranged to detect that said conversion means has crossed the boundary between said first area and said second area based on the reaching a predetermined value of the count of said counting means.

Claim 26

A track access device including a conversion means for signal reproducing from or signal recording on an information recording medium having tracks wherein information is to be recorded or has been recorded and composed of a first area wherein information has been recorded in advance by the existence or non-existence of pits of rugged structure and a second area wherein information is optically recorded or reproduced on the film of recording material formed on the track, and moving said conversion means from a track wherein said conversion means is located from another desired track, which comprises a track crossing detection means for detecting that said conversion means has crossed a track or a middle point between two adjacent tracks; and a counting means for counting the outputs of said track crossing detection means, said track access device being arranged to detect that said conversion means has crossed the boundary between said first area and said second area based on the reaching a predetermined value of the count of said counting means.

Claim 27

A tracking control device comprising: a conversion means for reproducing signals from or recording signals on an information recording medium having tracks wherein information is to be recorded or has been recorded and composed of a first area wherein information has been in advance recorded by the existence or non-existence of pits of rugged structure and a second area wherein information is optically recorded or reproduced on the film of recording material formed on the track; a transfer means for moving said conversion means in a direction approximately parallel to said information recording medium and normal to each track; a detection means for detecting the positional relationship on said information recording medium between said conversion means and a track; and an amplification means capable of switching the amplification ratio of amplifying the output of said detection means; and controlling so that said conversion means become positioned approximately at a predetermined track by driving said transfer means in accordance with the output of said amplification means, which is characterized in that in the track access for moving said conversion means from the track wherein said conversion means is located to another desired track, the amplification ratio of said amplification means is changed over at the time point when said conversion means has crossed the boundary between said first area and said second area.

Claim 28

A tracking control device comprising: a conversion means for reproducing signals from or recording signals on an information recording medium having tracks wherein information is to be recorded or has been recorded and composed of a first area wherein information has been in advance recorded by the existence or non-existence of pits of rugged structure and a second area wherein information is optically recorded or reproduced on the film of recording material formed on the track; a transfer means for moving said conversion means in a direction approximately parallel to said information recording medium and normal to each track; a detection means for detecting the positional relationship on said information recording medium between said conversion means and a track; and an amplification means capable of switching the amplification ratio of amplifying the output of said detection means; and controlling so that said conversion means become positioned approximately at a predetermined track by driving said transfer means in accordance with the output of said amplification means, which is characterized in that in the track access for moving said conversion means from the track wherein said conversion means is located to another desired track, the amplification ratio of said amplification means is changed over at the time point when said conversion means has crossed the boundary between said first area and said second area.

Claim 29

The tracking control device as claimed in Claim 22, wherein the amplification ratio of said amplification means is changed over in two steps.

Claim 30

The tracking control device as claimed in Claim 23, wherein the amplification ratio of said amplification means is set so that the amplification ratio when said conversion means is located in the first area is higher than that when said conversion means is located in the second area.

Claim 31

The tracking control device as claimed in Claim 24, wherein the amplification ratio of said amplification means is set so that the output of said detection means generated when said conversion means has crossed a track in the first area becomes approximately equal to the output of said detection means generated which said conversion means has crossed a track in the second area.

Claim 32

The tracking control device as claimed in Claim 22, wherein a track crossing detection means for detecting that the conversion means has crossed a track or a middle point between adjacent tracks, and a counting means for counting the outputs of said track crossing detection means are provided, and by the reaching a predetermined value of the count of said counting means, it is detected that said conversion means has crossed the boundary of the first and second areas.

Claim 33

A tracking control device comprising: a conversion means for reproducing signals from or recording signals on an information recording medium having tracks wherein information is to be recorded or has been recorded and comprised of a first area wherein information has been in advance recorded by the existence or non-existence of pits of rugged structure and a second area wherein information is optically recorded or reproduced on the film of recording material formed on the track; a transfer means for moving said conversion means in a direction approximately parallel to said information recording medium and normal to each track thereof; a detection means for detecting the positional relationship on said information recording medium between said conversion means and a track; and an offset adding means capable of switching the offset amount to be added to the output of said detection means, and controlling so that said conversion means become positioned approximately on the predetermined track by driving said transfer means in accordance with the output of said offset adding means, which is characterized in that in the track access for moving said conversion means from the track wherein said conversion means is located to another desired track, the offset amount to be added by said offset adding means is changed over at the time point when said conversion means has crossed the boundary between said first and second areas.

Claim 34

A tracking control device comprising: a conversion means for reproducing signals from or recording signals on an information recording medium having tracks wherein information is to be recorded or has been recorded and comprised of a first area wherein information has been in advance recorded by the existence or non-existence of pits of rugged structure and a second area wherein information is optically recorded or reproduced on the film of recording material formed on the track; a transfer means for moving said conversion means in a direction approximately parallel to said information recording medium and normal to each track thereof; a detection means for detecting the positional relationship on said information recording medium between said conversion means and a track; and an offset adding means capable of switching the offset amount to be added to the output of said detection means, and controlling so that said conversion means become positioned approximately on the predetermined track by driving said transfer means in accordance with the output of said offset adding means, which is characterized in that in the track access for moving said conversion means from the track wherein said conversion means is located to another desired track, the offset amount to be added by said offset adding means is changed over at the time point when said conversion means has crossed the boundary between said first and second areas.

Claim 35

The tracking control device as claimed in Claim 27, wherein the offset amount added by said offset adding means is changed over in two steps.

Claim 36

The tracking control device as claimed in Claim 28, wherein the offset amount to be added by said offset adding means is set so as to approximately cancel the offset generated in the output of the detection means when said conversion means is located in the first area.

Claim 37

The tracking control device as claimed in Claim 29, wherein a track crossing detection means for detecting that the conversion means has crossed a track or a middle point between adjacent tracks, and a counting means for counting the outputs of said track crossing detection means are provided, and by the reaching a predetermined value of the count of said counting means, it is detected that said conversion means has crossed the boundary between said first and second areas.

Claim 38

The tracking control device as claimed in Claim 30, wherein said track crossing detection means detects that said conversion means has crossed a track or a middle point of adjacent two tracks based on the output signal of said offset adding means.

Claim 39

In a data recording/reproducing device having a pickup means for recording/reproducing information in tracks formed on a recording medium having first and second areas, a track access device for moving said pickup means from a starting track at which the pickup means is presently located to a target track comprising: means for moving said pickup means in a direction crossing said tracks; means for generating an analog signal representing the crossing of said tracks by said pickup means; position detecting means for detecting the position of said pickup means in either one of said first and second areas; amplifier means for amplifying said analog signal at a first amplification ratio when said position detecting means detects that said pickup means is in said first area, and at a second amplification ratio when said pickup means is detected as in said second area.

Claim 40

In a data recording/reproducing device having a pickup means for recording/reproducing information in tracks formed on a recording medium having first and second areas, a track access device for moving said pickup means from a starting track at which the pickup means is presently located to a target track comprising: means for moving said pickup means in a direction crossing said tracks; means for generating an analog signal representing the crossing of said tracks by said pickup means; position detecting means for detecting the position of said pickup means in either one of said first and second areas; amplifier means for amplifying said analog signal at a first amplification ratio when said position detecting means detects that said pickup means is in said first area, and at a second amplification ratio when said pickup means is detected as in said second area.

Claim 41

A track access device as claimed in Claim 32, wherein said first area has tracks formed by plane surface, and said second area has tracks formed by uneven surface, and wherein said second amplification ratio is greater than said first amplification ratio.

Claim 42

A track access device as claimed in Claim 33, wherein said position detecting means comprises: counter means for counting the number of tracks crossed by said moving means; first setting mean for setting a boundary track data indicative of the location of a boundary track located adjacent the boundary between said first and second areas; and first access detecting means for detecting the access of said pickup means to said boundary track as said counter counts tracks until in commensurate with said boundary track data.

Claim 43

A track access device as claimed in Claim 34, wherein said position detecting means further comprises: second setting means for setting a target track data indicative of the location of said target track; and second access detecting means for detecting the access of said pickup means to said target track as said counter counts tracks until in commensurate with said target track data.

Claim 44

In a data recording/reproducing device having a pickup means for recording/reproducing information in tracks formed on a recording medium having first and second areas, a track access device for moving said pickup means from a starting track at which the pickup means is presently located to a target track comprising: means for moving said pickup means in a direction crossing said tracks; means for generating an analog signal representing the crossing of said tracks by said pickup means; position detecting means for detecting the position of said pickup means in either one of said first and second areas; reference velocity setting means for setting reference velocity of said pickup means, said reference velocity including a first reference velocity which is set when said position detecting means detects that said pickup means is in said first area, and a second reference velocity which is set when said pickup means is detected as in said second area.

Claim 45

In a data recording/reproducing device having a pickup means for recording/reproducing information in tracks formed on a recording medium having first and second areas, a track access device for moving said pickup means from a starting track at which the pickup means is presently located to a target track comprising: means for moving said pickup means in a direction crossing said tracks; means for generating an analog signal representing the crossing of said tracks by said pickup means; position detecting means for detecting the position of said pickup means in either one of said first and second areas; reference velocity setting means for setting reference velocity of said pickup means, said reference velocity including a first reference velocity which is set when said position detecting means detects that said pickup means is in said first area, and a second reference velocity which is set when said pickup means is detected as in said second area.

Claim 46

A track access device as claimed in Claim 36, wherein each of said first and second reference velocities varies to be small as the pickup means moves towards said target track.

Claim 47

A track access device as claimed in Claim 36, wherein said first reference velocity is greater than said second reference velocity .

Claim 48

In a data recording/reproducing device having a pickup means for recording/reproducing information in tracks formed on a recording medium having first and second areas, a track access device for moving said pickup means from a starting track at which the pickup means is presently located to a target track comprising: means for moving said pickup means in a direction crossing said tracks; means for generating an analog signal representing the crossing of said tracks by said pickup means; position detecting means for detecting the position of said pickup means in either one of said first and second areas; binary circuit means having a hysteresis comparator for changing said analog signal to a digital signal with a small hysteresis amount when said position detecting means detects that said pickup means is in said first area, and with a high hysteresis amount when said pickup means is detected as in said second area.

Claim 49

In a data recording/reproducing device having a pickup means for recording/reproducing information in tracks formed on a recording medium having first and second areas, a track access device for moving said pickup means from a starting track at which the pickup means is presently located to a target track comprising: means for moving said pickup means in a direction crossing said tracks; means for generating an analog signal representing the crossing of said tracks by said pickup means; position detecting means for detecting the position of said pickup means in either one of said first and second areas; binary circuit means having a hysteresis comparator for changing said analog signal to a digital signal with a small hysteresis amount when said position detecting means detects that said pickup means is in said first area, and with a high hysteresis amount when said pickup means is detected as in said second area.

Claim 50

In a data recording/reproducing device having a pickup means for recording/reproducing information in tracks formed on a recording medium having first and second areas, a track access device for moving said pickup means from a starting track at which the pickup means is presently located to a target track comprising: means for moving said pickup means in a direction crossing said tracks; means for generating an analog signal representing the crossing of said tracks by said pickup means; position detecting means for detecting the position of said pickup means in either one of said first and second areas; offset adding means for adding a predetermined amount to said analog signal when said position detecting means detects that said pickup means is in said second area to counterbalance an offset amount observed in said analog signal.

Claim 51

In a data recording/reproducing device having a pickup means for recording/reproducing information in tracks formed on a recording medium having first and second areas, a track access device for moving said pickup means from a starting track at which the pickup means is presently located to a target track comprising: means for moving said pickup means in a direction crossing said tracks; means for generating an analog signal representing the crossing of said tracks by said pickup means; position detecting means for detecting the position of said pickup means in either one of said first and second areas; offset adding means for adding a predetermined amount to said analog signal when said position detecting means detects that said pickup means is in said second area to counterbalance an offset amount observed in said analog signal.