Objective lens for a pickup optical system
AssigneeFuji Photo Optical Co., Ltd.
InventorsYoshimitsu Nomura, Masaaki Fukuda, Takashi Ito, Kaneyoshi Yagi
Life of this patent
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Abstract
An objective lens for a pickup optical system for optically reading out information recorded in a recording medium , includes a first lens body and a second lens body integrally attached to a surface of the first lens body and having a micro Fresnel portion for focusing light to a predetermined position of the recording medium. When the objective lens is used for a pickup optical system, the micro Fresnel portion faces away from an accommodation region for accommodating the recording medium to prevent dust from attaching to the micro Fresnel portion.
Claims11
An objective lens for a pickup optical system for optically reading information recorded on a recording medium, comprising:
- a first lens body having first and second opposite sides, the first lens body to be arranged with its first side opposing an accommodation region for accommodating said recording medium;
- and
- a second lens body integrally attached to the second side of said first lens body and having a micro Fresnel portion for focusing incident light to a predetermined position of said recording medium.
A pickup optical system comprising:
- an accommodation region for receiving a recording medium;
- a light source;
- and
- an objective lens focusing light from the light source at said accommodation region and including a first lens body having first and second opposite sides, with said first side opposing said accommodation region, and a second lens body attached to said second side of said first lens body and having a micro Fresnel portion.
Dependencies are inferred from the claim text.