Driving signal for coarse servo employing sampled offset signal

Claim 1

A system for generating a coarse actuator drive signal in an optical information storage device, comprising: a recording medium having intermittently spaced means for providing light, wherein said light is used to determine the position of a fine assembly relative to a coarse assembly; a fine assembly having an optical pathway for receiving light provided by said intermittently spaced means; a coarse assembly operatively connected to said fine assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; an optical detector connected to said coarse assembly for receiving light from said optical pathway and producing information relating to the position of said fine assembly relative to said coarse assembly, said optical detector having a first element for receiving light from said optical pathway and generating a first component of said information, said first component being representative of the light incident on said first element, and a second element for receiving light from said optical pathway and generating a second component of said information, said second component being representative of the light incident on said second element, wherein the light incident on said first and second elements provides information regarding the position of said fine assembly relative to said coarse assembly; means for processing said information and for generating a coarse actuator drive signal for use in positioning said coarse assembly relative to said fine assembly, said means for processing having means for taking the difference between said first component and said second component thereby producing a first signal and means for sampling said first signal according to said intermittent spacing to generate said coarse actuator drive signal; and a coarse actuator, responsive to said coarse actuator drive signal, for positioning said coarse assembly relative to said fine assembly.

Claim 2

A system for generating a coarse actuator drive signal in an optical information storage device, comprising: a recording medium having intermittently spaced means for providing light, wherein said light is used to determine the position of a fine assembly relative to a coarse assembly; a fine assembly having an optical pathway for receiving light provided by said intermittently spaced means; a coarse assembly operatively connected to said fine assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; an optical detector connected to said coarse assembly for receiving light from said optical pathway and producing information relating to the position of said fine assembly relative to said coarse assembly, said optical detector having a first element for receiving light from said optical pathway and generating a first component of said information, said first component being representative of the light incident on said first element, and a second element for receiving light from said optical pathway and generating a second component of said information, said second component being representative of the light incident on said second element, wherein the light incident on said first and second elements provides information regarding the position of said fine assembly relative to said coarse assembly; means for processing said information and for generating a coarse actuator drive signal for use in positioning said coarse assembly relative to said fine assembly, said means for processing having means for taking the difference between said first component and said second component thereby producing a first signal and means for sampling said first signal according to said intermittent spacing to generate said coarse actuator drive signal; and a coarse actuator, responsive to said coarse actuator drive signal, for positioning said coarse assembly relative to said fine assembly.

Claim 5

A system for generating a coarse actuator drive signal in an optical information storage device, comprising: a recording medium having mirror areas for reflecting light incident thereon, said mirror areas having intermittent spacing on said recording means; a fine assembly having an optical pathway for receiving light reflected by said mirror area; a coarse assembly operatively connected to said fine assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; a coarse actuator for moving said coarse assembly; an optical detector connected to said coarse assembly for receiving light from said optical pathway and producing information relating to the position of said fine assembly relative to said coarse assembly, said optical detector having a first element for receiving light from said optical pathway and generating a first component of said information, said first component being representative of the light incident on said first element, and having a second element for receiving light from said optical pathway and generating a second component of said information, said second component being representative of the light incident on said second element; and means for processing said information and for generating a coarse actuator drive signal thereby causing said coarse actuator to position said coarse assembly relative to said fine assembly, said means for processing having means for subtracting said first component from said second component thereby producing a first signal, said first signal being representative of the position of said fine assembly relative to said coarse assembly and means for sampling said first signal according to said intermittent spacing to generate said coarse actuator drive signal.

Claim 6

A system for generating a coarse actuator drive signal in an optical information storage device, comprising: a recording medium having mirror areas for reflecting light incident thereon, said mirror areas having intermittent spacing on said recording means; a fine assembly having an optical pathway for receiving light reflected by said mirror area; a coarse assembly operatively connected to said fine assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; a coarse actuator for moving said coarse assembly; an optical detector connected to said coarse assembly for receiving light from said optical pathway and producing information relating to the position of said fine assembly relative to said coarse assembly, said optical detector having a first element for receiving light from said optical pathway and generating a first component of said information, said first component being representative of the light incident on said first element, and having a second element for receiving light from said optical pathway and generating a second component of said information, said second component being representative of the light incident on said second element; and means for processing said information and for generating a coarse actuator drive signal thereby causing said coarse actuator to position said coarse assembly relative to said fine assembly, said means for processing having means for subtracting said first component from said second component thereby producing a first signal, said first signal being representative of the position of said fine assembly relative to said coarse assembly and means for sampling said first signal according to said intermittent spacing to generate said coarse actuator drive signal.

Claim 7

A system for generating a coarse actuator drive signal in an optical information storage device, comprising: a recording medium having mirror areas for reflecting light incident thereon, said mirror areas having intermittent spacing on said recording medium; a fine assembly having an optical pathway for receiving light reflected by said mirror areas; a coarse assembly operatively connected to said fine assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; a coarse actuator for moving said coarse assembly; an optical detector connected to said coarse assembly for receiving light from said optical pathway and producing information relating to the position of said fine assembly relative to said coarse assembly, said optical detector having a first element for receiving light from said optical pathway and generating a first component of said information, said first component being representative of the light incident on said first element, and having a second element for receiving light from said optical pathway and generating a second component of said information, said second component being representative of the light incident on said second element; means for processing said information and for generating a coarse actuator drive signal thereby causing said coarse actuator to position said coarse assembly relative to said fine assembly, said means for processing having means for subtracting said first component from said second component thereby producing a first signal, said first signal being representative of the position of said fine assembly relative to said coarse assembly; means for sampling said first signal according to said intermittent spacing to generate a second signal; means for high-pass filtering said second signal to eliminate a first low frequency information in said second signal and thereby producing a third signal; means for providing a second low frequency signal; and means for adding said second low frequency signal to said third signal thereby replacing said first low frequency information eliminated by said high-pass filtering and producing said coarse actuator drive signal.

Claim 8

A system for generating a coarse actuator drive signal in an optical information storage device, comprising: a recording medium having mirror areas for reflecting light incident thereon, said mirror areas having intermittent spacing on said recording medium; a fine assembly having an optical pathway for receiving light reflected by said mirror areas; a coarse assembly operatively connected to said fine assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; a coarse actuator for moving said coarse assembly; an optical detector connected to said coarse assembly for receiving light from said optical pathway and producing information relating to the position of said fine assembly relative to said coarse assembly, said optical detector having a first element for receiving light from said optical pathway and generating a first component of said information, said first component being representative of the light incident on said first element, and having a second element for receiving light from said optical pathway and generating a second component of said information, said second component being representative of the light incident on said second element; means for processing said information and for generating a coarse actuator drive signal thereby causing said coarse actuator to position said coarse assembly relative to said fine assembly, said means for processing having means for subtracting said first component from said second component thereby producing a first signal, said first signal being representative of the position of said fine assembly relative to said coarse assembly; means for sampling said first signal according to said intermittent spacing to generate a second signal; means for high-pass filtering said second signal to eliminate a first low frequency information in said second signal and thereby producing a third signal; means for providing a second low frequency signal; and means for adding said second low frequency signal to said third signal thereby replacing said first low frequency information eliminated by said high-pass filtering and producing said coarse actuator drive signal.

Claim 11

A system for generating a coarse actuator drive signal in an optical information storage device, comprising: a recording medium having a first area, responsive to incident light, for providing first light and a second area, responsive to incident light, for providing second light; a fine assembly having an optical pathway for receiving said first light and said second light produced by said first area and said second area; a coarse assembly operatively connected to said fine assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; an optical detector connected to said coarse assembly for receiving light from said optical pathway and producing information relating to the position of said fine assembly relative to said coarse assembly, said optical detector having a first element for receiving light from said optical pathway and generating a first component of said information, said first component being representative of the light incident on said first element, and a second element for receiving light from said optical pathway and generating a second component of said information, said second component being representative of the light incident on said second element, wherein the light incident on said first and second elements and produced by said first area provides information on the position of said fine assembly relative to said coarse assembly and undesirable information, wherein the light incident on said first and second elements and produced by said second area provides information for at least partially eliminating said undesirable information; means for processing said information produced by said first and second areas and for generating a coarse actuator drive signal wherein said means for processing uses said information produced by said second area for at least partially eliminating said undesirable information from the information produced by said first area; and a coarse actuator, responsive to said coarse actuator drive signal, for positioning said coarse assembly relative to said fine assembly.

Claim 12

A system for generating a coarse actuator drive signal in an optical information storage device, comprising: a recording medium having a first area, responsive to incident light, for providing first light and a second area, responsive to incident light, for providing second light; a fine assembly having an optical pathway for receiving said first light and said second light produced by said first area and said second area; a coarse assembly operatively connected to said fine assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; an optical detector connected to said coarse assembly for receiving light from said optical pathway and producing information relating to the position of said fine assembly relative to said coarse assembly, said optical detector having a first element for receiving light from said optical pathway and generating a first component of said information, said first component being representative of the light incident on said first element, and a second element for receiving light from said optical pathway and generating a second component of said information, said second component being representative of the light incident on said second element, wherein the light incident on said first and second elements and produced by said first area provides information on the position of said fine assembly relative to said coarse assembly and undesirable information, wherein the light incident on said first and second elements and produced by said second area provides information for at least partially eliminating said undesirable information; means for processing said information produced by said first and second areas and for generating a coarse actuator drive signal wherein said means for processing uses said information produced by said second area for at least partially eliminating said undesirable information from the information produced by said first area; and a coarse actuator, responsive to said coarse actuator drive signal, for positioning said coarse assembly relative to said fine assembly.

Claim 15

A system for generating a coarse actuator drive signal in an optical information storage device, comprising: a recording medium having a first area for reflecting light incident thereon and a second area for reflecting light incident thereon; a fine assembly having an optical pathway for receiving light reflected by said first area and said second area; a coarse assembly operatively connected to said fine assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; a coarse actuator for moving said coarse assembly; an optical detector connected to said coarse assembly for receiving light from said optical pathway and producing information relating to the position of said fine assembly relative to said coarse assembly, said optical detector having a first element for receiving light from said optical pathway and generating a first component of said information said first component being representative of the light incident on said first element, and having a second element for receiving light from said optical pathway and generating a second component of said information, said second component being representative of the light incident on said second element; means for processing said information and for generating a coarse actuator drive signal thereby causing said coarse actuator to position said coarse assembly relative to said fine assembly, said means for processing having means for producing a first signal from said first component and said second component as a result of light being reflected from said first area, said first signal having a first part and a second part; means for producing a second signal from said first component and said second component as a result of light being reflected from said second area, said second signal having a third part being substantially similar to said second part; and means for subtracting said second signal from said first signal thereby producing a coarse actuator drive signal having substantially said first part.

Claim 16

A system for generating a coarse actuator drive signal in an optical information storage device, comprising: a recording medium having a first area for reflecting light incident thereon and a second area for reflecting light incident thereon; a fine assembly having an optical pathway for receiving light reflected by said first area and said second area; a coarse assembly operatively connected to said fine assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; a coarse actuator for moving said coarse assembly; an optical detector connected to said coarse assembly for receiving light from said optical pathway and producing information relating to the position of said fine assembly relative to said coarse assembly, said optical detector having a first element for receiving light from said optical pathway and generating a first component of said information said first component being representative of the light incident on said first element, and having a second element for receiving light from said optical pathway and generating a second component of said information, said second component being representative of the light incident on said second element; means for processing said information and for generating a coarse actuator drive signal thereby causing said coarse actuator to position said coarse assembly relative to said fine assembly, said means for processing having means for producing a first signal from said first component and said second component as a result of light being reflected from said first area, said first signal having a first part and a second part; means for producing a second signal from said first component and said second component as a result of light being reflected from said second area, said second signal having a third part being substantially similar to said second part; and means for subtracting said second signal from said first signal thereby producing a coarse actuator drive signal having substantially said first part.

Claim 21

A method for generating a coarse actuator drive signal in an optical information storage device, comprising: projecting light onto and thereby producing light from intermittently spaced means residing on a recording medium; receiving light produced from said intermittently spaced means using a fine assembly, with said fine assembly operatively connected to a coarse assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; directing said light produced from said intermittently spaced means and received by said fine assembly to an optical detector connected to said coarse assembly, said optical detector producing information relating to the position of said fine assembly relative to said coarse assembly; generating a first component of said information using a first element of said optical detector, said first component being representative of the light incident on said first element; generating a second component of said information using a second element of said optical detector, said second component being representative of the light incident on said second element; processing said information to generate a coarse actuator drive signal, said step of processing including taking the difference between said first component and said second component thereby producing a first signal and further sampling said first signal using said intermittently spaced means to generate a coarse actuator drive signal; and applying said coarse actuator drive to a coarse actuator to position said coarse assembly relative to said fine assembly.

Claim 22

A method for generating a coarse actuator drive signal in an optical information storage device, comprising: projecting light onto and thereby producing light from intermittently spaced means residing on a recording medium; receiving light produced from said intermittently spaced means using a fine assembly, with said fine assembly operatively connected to a coarse assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; directing said light produced from said intermittently spaced means and received by said fine assembly to an optical detector connected to said coarse assembly, said optical detector producing information relating to the position of said fine assembly relative to said coarse assembly; generating a first component of said information using a first element of said optical detector, said first component being representative of the light incident on said first element; generating a second component of said information using a second element of said optical detector, said second component being representative of the light incident on said second element; processing said information to generate a coarse actuator drive signal, said step of processing including taking the difference between said first component and said second component thereby producing a first signal and further sampling said first signal using said intermittently spaced means to generate a coarse actuator drive signal; and applying said coarse actuator drive to a coarse actuator to position said coarse assembly relative to said fine assembly.

Claim 28

A method for generating a coarse actuator drive signal in an optical information storage device, comprising: projecting light onto and thereby producing light from a first area and a second area residing on a recording medium; receiving light produced from said first area and said second area using said fine assembly, with said fine assembly operatively connected to a coarse assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; directing said light produced from said first area and said second area and received by said fine assembly to an optical detector connected to said coarse assembly, said optical detector producing information relating to the position of said fine assembly relative to said coarse assembly; generating a first component of said information using a first element of said optical detector, said first component being representative of the light incident on said first element; generating a second component of said information using a second element of said optical detector, said second component being representative of the light incident on said second element, wherein the light incident on said first and second elements and produced from said first area provides information on the position of said fine assembly relative to said coarse assembly and undesirable information, wherein the light incident on said first and second elements and produced from said second area provides information for at least partially eliminating said undesirable information; processing said information to generate a coarse actuator drive signal, said step of processing including using the information produced from said second area for at least partially eliminating said undesirable information produced from said first area; and applying said coarse actuator drive signal to a coarse actuator to position said coarse assembly relative to said fine assembly.

Claim 29

A method for generating a coarse actuator drive signal in an optical information storage device, comprising: projecting light onto and thereby producing light from a first area and a second area residing on a recording medium; receiving light produced from said first area and said second area using said fine assembly, with said fine assembly operatively connected to a coarse assembly, said coarse assembly movable relative to said fine assembly and said fine assembly movable relative to said coarse assembly; directing said light produced from said first area and said second area and received by said fine assembly to an optical detector connected to said coarse assembly, said optical detector producing information relating to the position of said fine assembly relative to said coarse assembly; generating a first component of said information using a first element of said optical detector, said first component being representative of the light incident on said first element; generating a second component of said information using a second element of said optical detector, said second component being representative of the light incident on said second element, wherein the light incident on said first and second elements and produced from said first area provides information on the position of said fine assembly relative to said coarse assembly and undesirable information, wherein the light incident on said first and second elements and produced from said second area provides information for at least partially eliminating said undesirable information; processing said information to generate a coarse actuator drive signal, said step of processing including using the information produced from said second area for at least partially eliminating said undesirable information produced from said first area; and applying said coarse actuator drive signal to a coarse actuator to position said coarse assembly relative to said fine assembly.