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Browse by Category: Main > Electrical & Energy
Class Information
Number: 250/201.5
Name: Radiant energy > Photocells; circuits and apparatus > Photocell controls its own optical systems > Automatic focus control > Active autofocus > With optical storage medium; e.g., optical disc, etc.
Description: Subject matter in which the image is formed on the surface of an optical information storage or retrieval medium, e.g., an optical disc.










Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12

Patent Number Title Of Patent Date Issued
8495813 Method of making an energy-assisted magnetic recording apparatus Jul. 30, 2013
8455805 Two dimensional barcodes and mobile terminals Jun. 4, 2013
8393074 Method of manufacturing thermally-assisted magnetic recording head and alignment apparatus Mar. 12, 2013
8329106 Miniaturized apparatus for real-time monitoring Dec. 11, 2012
8269157 Optical imaging system Sep. 18, 2012
8270283 Transmedian storage and transfer device Sep. 18, 2012
8159908 Photo diode ic Apr. 17, 2012
8154808 Autofocus imaging apparatus Apr. 10, 2012
8111598 Optical disk apparatus and emission control method Feb. 7, 2012
7982169 Apparatus and method for detecting the focal position of an optical system and opthalmological treatment apparatus Jul. 19, 2011
7956312 Optical disc device Jun. 7, 2011
7915569 Method for calibrating focus level on a light scribe disc Mar. 29, 2011
7821652 System and method for focusing discrete points on an under-measured object Oct. 26, 2010
7755014 Optical pickup device Jul. 13, 2010
7750276 Optical information detecting method, optical head, and optical disc apparatus utilizing plural photodetectors Jul. 6, 2010
7718939 Optical pickup apparatus May. 18, 2010
7671312 Optical pickup system, optical system, and optical information recording medium Mar. 2, 2010
7636286 Front photo detector having no gain selection switch, optical pick-up including the front photo detector, and optical recording and/or playing apparatus including the front photo detector Dec. 22, 2009
7630152 Optical pickup device, and optical disc device Dec. 8, 2009
7622696 Optical head device, optical information recording/reproducing apparatus and operation method of optical information recording/reproducing apparatus Nov. 24, 2009
7595472 Optical head device Sep. 29, 2009
7592585 Optical pickup Sep. 22, 2009
7569801 Optical head, optical reproducing apparatus, and optical recording and reproducing apparatus Aug. 4, 2009
7550700 Light-receiving semiconductor device and optical pickup device Jun. 23, 2009
7547868 Optical near-field generating apparatus and method and information recording and reproducing apparatus Jun. 16, 2009
7541564 Optical pickup Jun. 2, 2009
7534981 Optical semiconductor device having a shield wire and optical pickup device having a shield wire May. 19, 2009
7531773 Auto-focus and zoom module having a lead screw with its rotation results in translation of an optics group May. 12, 2009
7531772 Apparatus for translational displacement of a lens in a laser focussing optical system May. 12, 2009
7514661 Focus calibration in an optical drive Apr. 7, 2009
7498550 Optical pickup apparatus which records and/or reproduces information using different types of optical information recording mediums Mar. 3, 2009
7482573 Optical head, optical reproduction apparatus and optical record and reproduction apparatus Jan. 27, 2009
7470879 Optical pickup, information processing apparatus and signal processing method Dec. 30, 2008
7435936 Light analyzer device and method for detecting objects utilizing the light analyzer device Oct. 14, 2008
7435934 Optical pickup apparatus which is compatible with multiple types of media Oct. 14, 2008
7432487 Device for correcting output of optical pickup Oct. 7, 2008
7423246 Analysis apparatus and analysis disc used for the same Sep. 9, 2008
7408143 Previous amplifier circuit, light-receiving amplifier circuit, and optical pickup apparatus having grounded emitter amplifier circuits each with a grounded emitter transistor Aug. 5, 2008
7405383 Optical pickup device having three light sources with a holographic element for directing diffraction light to photodetectors Jul. 29, 2008
7405386 Light receiving device for reading an optical medium with reducing influence of dark current and stray light performance Jul. 29, 2008
7394050 Method of vertical deviation disc detection Jul. 1, 2008
7394049 Optical disk apparatus and pickup unit Jul. 1, 2008
7378627 Semiconductor light receiving element and optical pick-up device having the semiconductor light receiving element May. 27, 2008
7358471 Optical head device Apr. 15, 2008
7358470 Optical pickup Apr. 15, 2008
7348529 Optical device and optical pickup device Mar. 25, 2008
7348548 Image forming apparatus and image forming method Mar. 25, 2008
7345266 Optical medium judging method for avoiding the collision of an objective lens with a disk Mar. 18, 2008
7319221 Light-receiving device, optical pickup, and optical disc apparatus Jan. 15, 2008
7301862 Optical disc drive having tilt controlled objective lens and optical disc Nov. 27, 2007

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