Optical pickup
AssigneeFunai Electric Co., Ltd.
InventorMio Koga
Life of this patent
Estimating the term…
Abstract
In an optical pickup projecting a laser beam from a laser diode onto a disk through a half mirror, a collimator lens and an objective lens and receiving the laser beam reflected by the disk in a photodiode through the half mirror thereby reading information recorded in the disk, a portion of a metal board body having a pattern of a printed board corresponding to a connector pin fed with a high-frequency signal is notched to cause no electrostatic capacitance between the metal board body and the printed board thereby preventing a read signal from the photodiode from a jitter. Thus obtained is a high-performance and low-priced optical pickup causing no reading error.
Claims4
An optical pickup having a photodiode arranged in an opening formed on an end of a light transmission hole provided with a half mirror in a pickup body of synthetic resin, a collimator lens and an objective lens arranged in an opening formed on another end of said light transmission hole, a laser diode stored in said light transmission hole on a position opposed to said half mirror and a printed board, connecting said photodiode and said laser diode to a connector through cables, provided on the outer peripheral surface of said pickup body, for the purpose of projecting a laser beam from said laser diode onto a disk through said half mirror, said collimator lens and said objective lens and receiving said laser beam reflected by said disk in said photodiode through said half mirror thereby reading information recorded in said disk, wherein
- a board body of said printed board consists of a metal plate, a metal plate portion of said printed board corresponding to a connector pin portion fed with a high-frequency signal is notched, and an extension integrally provided on a metal support substrate for said laser diode is inserted in a concave groove formed on the outer peripheral surface of said pickup body for fixing said board body to said pickup body thereby bringing said board body into close contact with said extension and the outer peripheral surface of said pickup body.
An optical pickup having a photodiode arranged in an opening formed on an end of a light transmission hole provided with a half mirror in a pickup body of synthetic resin, a collimator lens and an objective lens arranged in an opening formed on another end of said light transmission hole, a laser diode stored in said light transmission hole on a position opposed to said half mirror and a printed board, connecting said photodiode and said laser diode to a connector through cables, provided on the outer peripheral surface of said pickup body, for the purpose of projecting a laser beam from said laser diode onto a disk through said half mirror, said collimator lens and said objective lens and receiving said laser beam reflected by said disk in said photodiode through said half mirror thereby reading information recorded in said disk, wherein
- a board body of said printed board consists of a metal plate and a metal plate portion of said printed board corresponding to a connector pin portion fed with a high-frequency signal is notched.
Dependencies are inferred from the claim text.