Optical pickup

Details Optical pickup Optical pickup

2008-04-15

2008-04-15

Epps, Georgla (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S225000, C369S044130, C369S044230, C359S569000

Reexamination Certificate

active

11373379

ABSTRACT:
An optical pickup with a reflective coating device is provided, including a laser diode (LD), an optical element, and a photo detector integrated circuit (PDIC). The LD emits 1-3 lights with different wavelengths but the same polarization orientation. The beam transmits through the optical element set and focus on a recording media for data reading and writing. The beams are reflected by the recording media, through the optical element set, and detected by the PDIC for signal detection. The optical element set further includes a grating, a reflective coating device, and an objective lens. By using the reflective coating device to change the linear polarization orientation of the emitting light and the feedback light for 90° angle, the relative intensity noise caused by the feedback light in LD can be reduced.

REFERENCES:
patent: 5644563 (1997-07-01), Yang
patent: 7110180 (2006-09-01), Kawasaki et al.
patent: 2006/0013090 (2006-01-01), Yokoi

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