Optical information reproducing apparatus having circuit for adjusting reproducing power
AssigneeCanon Kabushiki Kaisha
InventorKoichiro Nishikawa
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Abstract
An optical information reproducing apparatus for reproducing information by irradiating a recording medium with a reproducing light beam includes a light source for generating the reproducing light beam, a reproducing circuit for reproducing a reproduction signal by using the light beam, and an adjusting circuit for adjusting the light beam power. The adjusting circuit adjusts the beam power to a value larger than the light beam power at which a value obtained by normalizing the reproduction signal with the beam power is maximized.
Claims6
An optical information reproducing apparatus for reproducing information by irradiating a recording medium with a reproducing light beam, comprising:
- a light source for generating the reproducing light beam;
- a reproducing circuit for reproducing a reproduction signal by using the light beam;
- and
- an adjusting circuit for adjusting the light beam power,
- wherein said adjusting circuit adjusts the light beam power to a value larger than the light beam power at which a value obtained by normalizing the reproduction signal with the light beam power is maximized, such that said adjusting circuit adjusts the light beam power to satisfy
- 1.1×Pm<Pr<1.6×Pm
- where Pr is a light beam power to be set, and Pm is a light beam at which the normalized value is maximized.
An optical information reproducing method of reproducing information by irradiating a recording medium with a reproducing light beam, comprising the steps of:
- reproducing a reproduction signal by using the light beam;
- and
- adjusting the light beam power to a value larger than the light beam power at which a value obtained by normalizing the reproduction signal with the beam power is maximized,
- wherein, in said step of adjusting, the light beam power is adjusted to satisfy
- 1.1×Pm<Pr<1.6×Pm
- where Pr is a light beam power to be set, and Pm is a light beam at which the normalized value is maximized.
Dependencies are inferred from the claim text.