Optical pickup and optical disk drive apparatus
An optical pickup includes an objective lens, a protection member for protecting the objective lens, and a lens holding member configured to hold these members. The optical pickup records and/or reproduces an information signal on and/or from an optical recording medium by condensing laser light through the objective lens. The protection member includes a bearing surface to contact a surface of an edge portion of the objective lens not facing the optical recording medium, an aperture to control a diameter of laser light to be incident on the objective lens, and a protection portion protruding toward the optical recording medium with respect to the objective lens. The bearing surface, the aperture, and the protection portion are integrally formed with one another.
1. An optical pickup comprising:
(1) an objective lens; and
(2) a lens holding member configured to hold the objective lens and a protection member for protecting the objective lens,
wherein the lens holding member comprises:
(a) a first fitting portion configured to fit to an edge portion of the objective lens;
(b) a first bearing surface configured to contact a surface of the edge portion of the objective lens not facing an optical recording medium; and
(c) a bonding recess configured to bond the objective lens,
wherein the protection member includes the following elements (i) to (v), which are integrally formed with one another:
(i) a second fitting portion configured to fit to the edge portion of the objective lens;
(ii) a second bearing surface configured to contact the surface of the edge portion of the objective lens not facing the optical recording medium;
(iii) an aperture configured to control a diameter of laser light to be incident on the objective lens;
(iv) a protection portion protruding toward the optical recording medium with respect to the objective lens; and
(v) a cut portion provided such that the cut portion faces the bonding recess and the edge portion of the objective lens that is exposed to the lens holding member from the protection member, and
wherein, in the cut portion, the edge portion of the objective lens fits to the first fitting portion of the lens holding member, the surface of the edge portion of the objective lens not facing the optical recording medium contacts the first bearing surface, and adhesive is filled in the bonding recess.
2. An optical disk drive apparatus configured to effect at least one of reproducing of an information signal from and recording of an information signal on an optical recording medium with laser light, said optical disk drive apparatus comprising:
a spindle motor configured to rotate the optical recording medium; and
the optical pickup according to claim 1 , the optical pickup irradiating the optical recording medium with the laser light.
3. An optical pickup comprising:
an objective lens;
a protection member for the objective lens; and
a lens holding member configured to hold the objective lens and the protection member,
wherein the optical pickup records an information signal on and reproduces an information signal from an optical recording medium by condensing laser light through the objective lens,
wherein the lens holding member includes a first fitting portion configured to be fitted to an edge portion of the objective lens, a first bearing surface configured to contact a surface of the edge portion of the objective lens not facing the optical recording medium, and a bonding recess configured to bond the objective lens,
wherein the protection member includes a second fitting portion configured to be fitted to the edge portion of the objective lens, a second bearing surface configured to contact the surface of the edge portion of the objective lens not facing the optical recording medium, an aperture configured to control a diameter of the laser light to be incident on the objective lens, a protection portion protruding toward the optical recording medium with respect to the objective lens, and a cut portion provided at a position facing the bonding recess to allow the edge portion of the objective lens to be exposed to the lens holding member from the protection member, in which the second fitting portion, the second bearing surface, the aperture, the protection portion, and the cut portion are integrally formed with one another, and wherein, in the cut portion, the edge portion of the objective lens is fitted to the first fitting portion of the lens holding member, the surface of the edge portion of the objective lens not facing the optical recording medium contacts the first bearing surface, and an adhesive is filled in the bonding recess.
4. An optical disk drive apparatus configured to rotationally drive an optical recording medium, to condense laser light onto the optical recording medium, and to effect reproducing of an information signal from and recording of an information signal on the optical recording medium with reflection light of the laser light, the optical disk drive apparatus comprising the optical pickup according to claim 3 .