JP2004013937A5 - - Google Patents

Claims (9)

A recording medium comprising a disc-shaped substrate and a signal recording layer formed on the main surface portion of the substrate,
In the signal recording layer, the first information signal is read out by a light beam incident substantially perpendicularly to the main surface portion of the substrate.
A recording medium, wherein a second information signal different from the first information signal is read by a light beam incident substantially parallel to the main surface of the substrate. In the signal recording layer, a light reflecting member inclined with respect to the main surface portion of the base is embedded at a position corresponding to the second information signal, and is incident substantially parallel to the main surface of the base. The recording medium according to claim 1, wherein the light beam reflected by the light reflecting member is emitted in a direction substantially perpendicular to the main surface portion of the substrate.   In the signal recording layer, a plurality of light reflecting members inclined with respect to the main surface portion of the base are embedded, and the second information is the side on which light reflected by these light reflecting members is emitted. A light shielding member is disposed at a position corresponding to the signal, and a light beam incident substantially parallel to the main surface of the substrate is reflected by the light reflecting member, and light is reflected at a position not shielded by the light shielding member. 2. The recording medium according to claim 1, wherein the member is emitted in a direction substantially perpendicular to a main surface portion of the substrate. A reproducing apparatus in which a recording medium including a disk-shaped substrate and a signal recording layer formed on a main surface portion of the substrate is mounted and an information signal is read from the recording medium,
A first reading means for causing a light beam to enter the signal recording layer substantially perpendicularly to the main surface portion of the substrate and reading a first information signal by a reflected light beam from the signal recording layer of the light beam;
Reading a second information signal different from the first information signal by causing a light beam to enter the main surface portion of the base body substantially in parallel and transmitting through at least one of the base body or the signal recording layer. And a second reading means for performing the above. In the recording medium to be mounted, a light reflecting member inclined with respect to the main surface portion of the base is embedded at a position corresponding to the second information signal of the signal recording layer. The light beam that is incident substantially in parallel is reflected by the light reflecting member, and is emitted through the signal recording layer in a direction substantially perpendicular to the main surface portion of the substrate.
The second reading means detects a light beam that is incident substantially parallel to the main surface portion of the substrate, is reflected by the light reflecting member, and is emitted in a direction substantially perpendicular to the main surface portion of the substrate. The playback apparatus according to claim 4.   6. The reproducing apparatus according to claim 5, wherein the second reading means causes a substantially parallel light beam to be incident on the main surface portion of the substrate from an outer peripheral edge portion of the signal recording layer.   The second reading means is substantially parallel to the main surface portion of the base from the inner peripheral edge of the signal recording layer formed at the center of the base and facing the inner peripheral edge of the through hole for supporting the base. 6. A reproducing apparatus according to claim 5, wherein a light beam is incident.   The second reading means is formed at the outer peripheral edge of the signal recording layer or the central part of the substrate that serves as an incident end of the light beam incident substantially parallel to the main surface of the substrate to the signal recording layer. A light beam substantially parallel to the main surface portion of the substrate is made incident on the signal recording layer via the light collecting means disposed on the inner periphery of the signal recording layer facing the inner periphery of the through hole. 6. A reproducing apparatus according to claim 5, wherein   The recording medium to be mounted is a side where a plurality of light reflecting members inclined with respect to the main surface portion of the substrate are embedded in the signal recording layer, and the light reflected by these light reflecting members is emitted from the recording medium. A light shielding member is disposed at a position corresponding to the second information signal, and a light beam that is incident on the main surface portion of the base body substantially in parallel is reflected by the light reflecting member and is not shielded by the light shielding member. The reflecting member emits light in a direction substantially perpendicular to the main surface portion of the substrate, and the second reading means is incident on the main surface portion of the substrate substantially in parallel and reflected by the light reflecting member. 5. A reproducing apparatus according to claim 4, wherein a light beam emitted in a direction substantially perpendicular to the main surface portion of the substrate is detected.