Optical pickup with two light sources and intensity monitoring method therefor

Abstract

Here are a compatible optical pickup, including first and second light sources for emitting lights with different wavelengths and first and second photodetectors for detecting an information signal and / or an error signal, and a method of detecting the amount of output light using the compatible optical pickup. The first photodetector monitors the amount of light output from the second light source, and the second photodetector monitors the amount of light output from the first light source. Since the first and second photodetectors are used to detect a signal for use in monitoring the amount of light output from each of the second and first light sources, no extra front photodetectors are required. Thus, the number of optical component parts included in the optical pickup can be reduced, thereby lowering the manufacturing costs for the optical pickup. Also, there is no need to secure a space in a base where a front photodetector is to be installed, so the base is simplified. Thus, inferior moldings are reduced, and the durability of a mold can be prolonged.

Description

technical field [0001] The invention relates to a compatible optical pickup and a method for detecting light output in the pickup. Background technique [0002] Recently, optical pickups have become more complex, requiring many components to meet needs such as compatible use of different types of optical discs, multiplier, etc. [0003] However, considering the space limitation of the optical pickup and the rapid spread of portable terminals (such as notebook computers, etc.), the new optical pickup must be compact and slim. In order to achieve this goal, it is necessary to reduce the number of components of the optical pickup. [0004] Simplifying the size and quantity of the components included in the optical pickup is very important for reducing the manufacturing cost of the optical pickup and simplifying the base surface design. [0005] A typical optical pickup includes a separate front photodetector to detect the light output from the light source. Generally, the fr...

AI Technical Summary

Problems solved by technology

[0006] A typical optical pickup including a separate front photodetector suffers from the following problems: Firstly, the optical pickup is expensive to manufacture due to multiple components

Secondly, since the base surface must have a space for installing the front photodetector, the structure of the base surface becomes complicated, so that in the process of injection molding the base surface, the flow of the liquid material constituting the base surface is poor.

As a result, poor quality casting molds often occur and lead to a shortened service life of molds used in injection molding substrates

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