JPH11176014A - Optical pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical pickup capable of preventing a disk recording surface from being damaged and fixing an objective lens, without any adhering work only by fitting one holding member to a lens holder. SOLUTION: This optical pickup is provided with an objective lens 14 for irradiating an optical disk with a laser light and receiving a reflected light from the optical disk, a cylindrical part 17 formed around the objective lens 14, an annular damage preventing part 31 for covering the disk opposite face 18 of the cylindrical part 17, a plurality of leg parts 32 extended from this damage preventing part 31 in an axial direction, a holding member 30 having a catch part 33 integrally formed in the tip of the leg part 32, and a lens holder having a through-hole for fitting the catch part 33 of the holding member 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical pickup in which a surface of an objective lens facing an optical disk is protected against disk damage.

[0002]

2. Description of the Related Art A CD drive for driving an optical disk such as a compact disk (CD) uses an optical pickup for reading information on the CD. FIG. 4 is a configuration diagram of a general optical pickup 10, in which 11 is a photodiode, 12 is a beam splitter, 13 is a rising mirror, and 14 is an objective lens.

The laser beam for reading generated by the photodiode 11 passes through a beam splitter 12, is changed in direction by a mirror 13, and is incident on an objective lens 14. The light incident on the objective lens 14 is focused on the CD 20 and is irradiated on the CD 20 surface. The reflected light from the CD 20 re-enters the objective lens 14 and the mirror 13
Through the light receiving system (not shown).

The optical pickup 10 is designed to read information from the CD 20 in a non-contact manner.
As the thickness of the D drive is reduced, the distance between the CD 20 and the optical pickup 10 cannot be sufficiently secured, and the CD 20 and the objective lens 14 may come into contact with each other due to external vibration or the like.

In such a case, in order to protect the recording surface of the CD 20 from mechanical damage, conventionally, as shown in FIG. 3, the C of a cylindrical portion 17 formed around the objective lens 14 is used.
The damage prevention material 15 is bonded to the D facing surface 18. As the damage prevention material 15, for example, a nylon sheet is used,
This is adhered to the CD facing surface 18 of the cylindrical portion 17 with a double-sided adhesive or an ultraviolet curing (UV) resin.

[0006]

In a conventional optical pickup, a damage preventing material 15 is adhered to a CD facing surface 18 of a cylindrical portion 17 of an objective lens 14, and the objective lens 14 itself is a lens as shown in FIG. It is bonded to the holder 16 with UV resin. Therefore, two bonding steps are required for one objective lens 14, and there is a disadvantage that the working efficiency is poor. This is a problem to be solved by the present invention.

The present invention provides an optical pickup capable of preventing damage to a recording surface of a disk and fixing an objective lens by only fitting one holding member to a lens holder without requiring any bonding work. It is intended to be.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an objective lens for irradiating an optical disk with laser light and receiving reflected light from the optical disk, and a cylindrical portion formed around the objective lens. An annular damage prevention portion covering the disk facing surface of the cylindrical portion, a plurality of legs extending in the axial direction from the damage prevention portion, and a holding member integrally formed with a claw formed at the tip of the leg. This can be achieved by an optical pickup including a lens holder having a fitting portion with which the claw portion of the holding member fits.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. FIG. 1 is an assembled perspective view showing an embodiment of the present invention, and FIG. 2 is a sectional view of an assembled state. In the figure, numeral 14 irradiates the optical disk with laser light,
An objective lens 17 receives the reflected light from the optical disk, 17 is a cylindrical portion formed around the objective lens 14, and 30 is a holding member of the present invention for fixing the objective lens 14 to the lens holder 16.

The holding member 30 has an annular damage preventing portion 31 covering the disk facing surface 18 of the cylindrical portion 17, a plurality of legs 32 extending from the damage preventing portion 31 in the axial direction, and a plurality of legs 32. The claw portion 33 formed at the tip is formed integrally with, for example, a nylon material. The lens holder 16 of the present invention has a through hole 34 into which the claw 33 of the holding member 30 is fitted.

When the holding member 30 having the above structure is used, as shown in FIG. 2, when the objective lens 14 is housed in the holding member 30 and fitted into the lens holder 16, the objective lens 14
Is fixed to the lens holder 16 without the need for a bonding operation. At the same time, the damage preventing portion 31 of the holding member 30 covers the disk facing surface 18 of the cylindrical portion 17, so that the bonding work of this portion can be omitted.

[0012]

As described above, according to the present invention, measures for preventing damage to the disk recording surface and fixing the objective lens can be achieved by merely fitting one holding member to the lens holder without requiring any bonding work. An optical pickup that can perform the operation can be provided.

[Brief description of the drawings]

FIG. 1 is an assembled perspective view showing one embodiment of the present invention.

FIG. 2 is a sectional view of the assembled state of FIG.

FIG. 3 is an enlarged sectional view of a CD facing surface of a conventional objective lens.

FIG. 4 is a partial cross-sectional view of a general optical pickup.

[Explanation of symbols]

 Reference Signs List 14 Objective lens 16 Lens holder 17 Cylindrical part 18 Disk facing surface 20 Optical disk (CD) 30 Holding member 31 Damage prevention part 32 Leg part 33 Claw part 34 Through hole

Claims (1)

[Claims] 1. An objective lens for irradiating a laser beam to an optical disk and receiving reflected light from the optical disk, a cylindrical portion formed around the objective lens, and a surface of the cylindrical portion facing the disk. An annular damage prevention portion, a plurality of legs extending in the axial direction from the damage prevention portion, a holding member integrally formed with a claw formed at the tip of the leg, and the claw of the holding member are fitted. An optical pickup comprising: a lens holder having a fitting portion.