G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1
G11B 7/00 (2006.01) G11B 7/0045 (2006.01)
Patent
CA 1301921
ABSTRACT OF THE DISCLOSURE A wavelength selective optical recording and reproducing device has a reference wavelength in a marker hole of a medium. The optical detector is adapted to detect light which is reflected from or transmitted through the marker hole. A phase detector detects the phase of an output of the optical detector by using a high frequency signal as a reference to obtain a signal indicative of the deviation of the wavelength of the output from a desired wavelength. A wavelength regulator is responsive to the wavelength deviation to control the wavelength of the light source to be the desired wavelength.
569537
Maeda Mitsuo
Okada Kazuo
Seya Masatomo
Yoshimura Motomu
Maeda Mitsuo
Mitsubishi Denki Kabushiki Kaisha
Okada Kazuo
Riches Mckenzie & Herbert Llp
Seya Masatomo
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