Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
127 words
An optical head for recording and/or reproducing information on and/or from an optical record medium, said optical head comprising a semiconductor laser diode for emitting a diverging laser beam, a collimator lens for converting the diverging laser beam emitted from a laser emitting point of the semiconductor laser diode into a parallel laser beam, a transmissive diffraction grating for dividing the parallel laser light beam emanating from the collimator lens into a plurality of laser beams, and an objective lens for projecting said plurality of laser beams onto the optical record medium, wherein said transmissive diffraction grating is arranged to be inclined with respect to a plane which is perpendicular to an optical axis of light from the semiconductor laser diode incident on the transmissive diffraction grating.
Claim 2
Dependent Claim
127 words
An optical head for recording and/or reproducing information on and/or from an optical record medium, said optical head comprising a semiconductor laser diode for emitting a diverging laser beam, a collimator lens for converting the diverging laser beam emitted from a laser emitting point of the semiconductor laser diode into a parallel laser beam, a transmissive diffraction grating for dividing the parallel laser light beam emanating from the collimator lens into a plurality of laser beams, and an objective lens for projecting said plurality of laser beams onto the optical record medium, wherein said transmissive diffraction grating is arranged to be inclined with respect to a plane which is perpendicular to an optical axis of light from the semiconductor laser diode incident on the transmissive diffraction grating.
Claim 3
Dependent Claim
42 words
An optical head according to claim 1, wherein said transmissive diffraction grating is inclined by such an angle that the laser beam reflected by the transmissive diffraction grating is not made incident upon the laser emitting point of the semiconductor laser diode.
Claim 4
Dependent Claim
45 words
An optical head according to claim 1, wherein said transmissive diffraction grating is inclined about an axis which situates in a plane of gratings of the transmissive diffraction grating and is perpendicular to a direction in which the gratings of the transmissive diffraction grating extend.
Claim 5
Dependent Claim
46 words
An optical head according to claim 1, wherein said transmissive diffraction grating is inclined about an axis which situates in a plane of gratings of the transmissive diffraction grating and is in parallel with a direction in which the gratings of the transmissive diffraction grating extend.
Claim 6
Dependent Claim
121 words
An optical head according to claim 1, wherein said semiconductor laser diode, collimator lens, transmissive diffraction grating and objective lens are arranged such that said plurality of laser beams emanating from the transmissive diffraction grating are made incident upon a first portion of the objective lens which is shifted from a center portion of the objective lens so that the plurality of laser beams are projected onto the optical record medium from directions which are inclined with respect to a direction perpendicular to a surface of the optical record medium and a plurality of laser beams reflected by the optical record medium are made incident upon a second portion of the objective lens which is diametrically opposed to said first portion.
Claim 7
Dependent Claim
51 words
An optical head according to claim 1, further comprising a beam shaping prism arranged between the collimator lens and the transmissive diffraction grating for converting the laser beam emanating from the collimator lens and having an elliptical cross sectional configuration into a laser beam having a substantially circular cross sectional configuration.
Claim 8
Dependent Claim
44 words
An optical head according to claim 6, wherein said beam shaping prism is arranged such that a direction in which the cross sectional configuration of the laser beam is changed is in parallel with an axis about which the transmissive diffraction grating is inclined.
Claim 9
Dependent Claim
40 words
An optical head according to claim 7, wherein said transmissive diffraction grating is arranged such that a direction in which gratings of the transmissive diffraction grating extend is perpendicular to said axis about which said transmissive diffraction grating is inclined.