Optical disc having pits of different depth formed therein, optical disc device for reproducing the same, and method of reproduction

(Cancelled, without prejudice)

(Cancelled, without prejudice)

(Cancelled, without prejudice)

An optical disc including a substrate having pits having at least two different depths formed therein, wherein

• the pits have their depths adjusted such that polarity of a signal representing difference in intensity distribution of a reflected light beam along a tangential direction of a pit string differ at a pit having a first depth from a pit having a second depth.

An optical disc including a substrate having pits having at least two different depths formed therein, wherein

• information is recorded in accordance with a polarity of a signal representing difference in intensity distribution of a reflected light beam along a tangential direction of a pit string, at said pits having at least two different depths.

An optical disc including a substrate having pits having at least two different depths formed therein, wherein

• information is recorded by a combination of a signal in accordance with quantity of reflected light beam from said pits having at least two different depths and a signal indicative of a difference in intensity distribution of the reflected light beam along a tangential direction of a pit string.

An optical disc including a substrate having pits having at least two different depths formed therein, wherein

• main information is recorded by a form of the pits, and additional information is recorded by the depth of a pit.

An optical disc reproducing device, comprising:

• a main information reproducing unit reproducing main information by a reflected light beam from a pit formed on a substrate of the optical disc;
• and
• an additional information reproducing unit reproducing additional information by detecting a depth of said pit.

(Cancelled, without prejudice)

(Cancelled, without prejudice)

(Cancelled, without prejudice)

(Cancelled, without prejudice)

(Cancelled, without prejudice)

(Cancelled, without prejudice)

(Cancelled, without prejudice)

(Cancelled, without prejudice)