초록 ▼

A recording/reproducing apparatus for an optical recording medium which is used for recording and/or reproducing information on/from the optical recording medium by irradiating the optical recording medium with a laser light using two-group objective lenses comprising at least two lenses as the firs

A recording/reproducing apparatus for an optical recording medium which is used for recording and/or reproducing information on/from the optical recording medium by irradiating the optical recording medium with a laser light using two-group objective lenses comprising at least two lenses as the first and second lenses, is provided so as to comprise a light source emitting the laser light, the first lens for focusing the laser light emitted from the light source, the second lens arranged between the first lens and the optical recording medium, and a device for moving both the first and second lenses relative to each other to change the distance between them in the optical axis direction of the laser beam, so that the moving device moves the second lens to change the distance between the first and second lenses. Consequently, this invention can provide the recording/reproducing apparatus with a larger numerical aperture (NA) and reduce the influence of spherical aberration on the light beam to realize high density recording/reproducing of information signals.

대표청구항 ▼

[ What is claimed is:] [1.] A recording/reproducing apparatus for an optical recording medium, used for carrying out at least one of information recording and reproducing by irradiating said optical recording medium with a light beam, said apparatus comprising:a light source emitting a light beam;a

[ What is claimed is:] [1.] A recording/reproducing apparatus for an optical recording medium, used for carrying out at least one of information recording and reproducing by irradiating said optical recording medium with a light beam, said apparatus comprising:a light source emitting a light beam;a first lens for focusing the light beam emitted from said light source;a second lens arranged between said first lens and the optical recording medium;first moving means for moving said first and second lenses in an optical axis direction of the light beam; andsecond moving means for moving one of said first and second lenses in the optical axis direction of the light beam relative to the other lens.