Composite optical unit

Abstract

An object of the present invention is to provide a compound optical unit which can be used in an optical pickup. The present invention has a casing installed on the optical pick-up device, and a semiconductor laser, a light receiving component, and a composite optical component are installed and fixed in the casing, and the semiconductor laser has a laser diode that emits a short-wavelength laser for DVD and a laser that emits a long-wavelength laser for CD. The diode is provided with an incident surface on which the light emitted from the semiconductor laser enters and an output surface on which it exits, in the composite optical component.

Description

technical field [0001] The present invention relates to a composite optical unit as a suitable light-receiving and emitting-integrated optical element used in an optical device such as an optical pickup that irradiates a light beam onto an optical disc to receive return light from the optical disc for recording or reproducing the optical disc. Background technique [0002] As the composite optical unit, there is an example of a composite optical unit that is a light-receiving and emitting-integrated optical element that irradiates laser light onto or receives laser light from the optical disc for recording or reproducing the optical disc. [0003] In order to record information on optical discs such as CD (CD), CD-R (CD-R), DVD (Digital Versatile Disc or Digital Video Disc) or reproduce information on the information recording surface of the optical disc, an optical pickup is used. The optical unit is loaded in the picker. [0004] In recent years, DVD devices for recording...

AI Technical Summary

Problems solved by technology

But, in this case, adjust optical member 5 so that the diffracted light corresponding to the respective light-receiving positions of the light-receiving elements for CD and DVD is received, because the distance deviation between the light-receiving elements for CD and DVD takes place, and become very difficult

[0020] On the basis of forming each light-receiving element to minimize the distance deviation between the above-mentioned light-receiving elements, by precisely adjusting the installation position of the optical unit 4, an optical unit suitable for two wavelengths can be formed. Even so, due to the addition of Light-receiving elements, but due to the increase in the number of parts, the structure becomes complicated and the cost of parts increases

The optical unit is very expensive due to the high cost of the formation process of the light receiving element and the high cost of the process cost due to the more precise adjustment process of the optical unit 4, which is an unrealistic method.

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