Samsung Electronics Co., Ltd.

Byeong-Ho Park

Chul-Woo Lee

Kun-Ho Cho

Dong-Ho Shin

Joong-Eon Seo

Seung-Tae Jung

Myong-Do Ro

In-Oh Hwang

Yoon-Gi Kim

Sung-ro Go

Yong-Jae Lee

Min Hwangbo

An optical data storage system writes or reads information with respect to an optical storage medium using an optical pickup including a solid immersion optical system or a solid immersion lens for generating a near-field and emitting a light beam. The optical storage medium includes a recording layer which is formed on a surface of an optical transmissive layer opposite to another surface of the optical transmissive layer which opposes the solid immersion optical system or solid immersion lens. The thickness of the optical transmissive layer is larger than one wavelength of the light beam. The interval between the surfaces of the solid immersion lens or solid immersion optical system and the optical transmissive layer is smaller than one wavelength of the light beam. Thus, the light beam reflected from the inside of an air gap and the inside of the optical storage medium between the air gap and the recording layer does not function as noise with respect to the light reflected from the recording layer. Also, since the thickness of a protective layer or a substrate which is an external surface of the optical storage medium can be thickened, information can be written or read with respect to the optical storage medium even when the optical storage medium has dust and/or damage.

Near-field optical storage medium and optical data storage system therefor

A servo controlling apparatus of an optical disk drive and a control method thereof are provided for achieving precise control by automatically controlling the gain of error signals caused by the difference in the amount of light irradiated during recording and reproducing, and then using the automatically gain-controlled signal. In a first control step, a focus error signal and a tracking error signal generated from a photodetecting portion via an operator are multiplied by a predetermined value in different multipliers, and then each obtained value is divided by an RF sum signal to control the value of error to within a predetermined target value. In a second control step, each multiplied focus error signal and tracking error signal are divided by a DC signal corresponding to the average level of the RF sum signal when the error value reaches the target value.

Servo controlling apparatus of optical disk drive and control method

A magnetooptical recording/reproducing apparatus including a light source for emitting light, an object lens for condensing the light onto a magnetooptical disk, a polarization beam splitter in an optical path between the light source and the object lens, a first holographic device for diffracting an ordinary beam from the light passing through the polarization beam splitter after being reflected from the magnetooptical disk and allowing an extraordinary beam to pass therethrough unaltered, a second holographic device for splitting the ordinary and extraordinary beams passed through the first holographic device into a plurality of beams, and a photodetector for detecting the beams passing through the first and second holographic devices.

Magnetooptical recording/reproducing apparatus

Growing community of inventors

Suwon, South Korea

Byeong-Ho Park