G11B 7/139
Numerical aperture control means
G11B7/139 (Numerical aperture control means) appears on 305 US grants and 219 published applications in this corpus.
Search patents in G11B- Granted patents
- 305
- Published applications
- 219
- Assignees
- 81
- Inventors
- 407
- Latest grant
- 12 Apr 2016
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 7 | 0 |
| 1998 | 18 | 0 |
| 1999 | 23 | 0 |
| 2000 | 31 | 0 |
| 2001 | 22 | 10 |
| 2002 | 20 | 22 |
| 2003 | 19 | 21 |
| 2004 | 16 | 34 |
| 2005 | 15 | 39 |
| 2006 | 18 | 24 |
| 2007 | 24 | 12 |
| 2008 | 25 | 20 |
| 2009 | 15 | 12 |
| 2010 | 15 | 10 |
| 2011 | 13 | 3 |
| 2012 | 7 | 8 |
| 2013 | 7 | 2 |
| 2014 | 3 | 2 |
| 2015 | 1 | 0 |
| 2016 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Objective lens element12 Apr 2016US 9,310,536 B2Panasonic Intellectual Property Management Co., Ltd.
- Liquid crystal optical element, optical device, and aperture control method6 Jan 2015US 8,928,845 B2Citizen Holdings Co., Ltd.
- Optical information apparatus and gap control method thereof7 Oct 2014US 8,854,939 B2Panasonic Corporation
- Objective lens element24 Jun 2014US 8,760,989 B2Panasonic Corporation
- Blu-ray optical pick-up devices and methods25 Feb 2014US 8,659,983 B2Marvell World Trade Ltd.
- Objective lens element4 Sep 2014US 2014/0247493 A1Panasonic Corporation
- Optical information apparatus and gap control method thereof2 Jan 2014US 2014/0003222 A1Panasonic Corporation
- Objective lens element4 Jul 2013US 2013/0170042 A1Panasonic Corporation
- Blu-Ray Optical Pick-Up Devices And Methods24 Jan 2013US 2013/0021888 A1Marvell World Trade Ltd.
- Objective lens and optical pick-up device using the same19 Jul 2012US 2012/0182847 A1Sanyo Electric Co., Ltd.
Most cited
By later US patents
- Compound objective lens having two focal points144US 5,446,565 AMatsushita Electric Industrial Co., Ltd. · 1995
- Switchable optical element85US 7,508,566 B2Koninklijke Philips Electronics N. V. · 2009
- Optical head apparatus for different types of disks78US 5,696,750 ANEC Corporation · 1997
- Short wavelength optical disk head having a changeable aperture76US 5,281,797 AHitachi, Ltd. · 1994
- Reproduction device for optical disks73US 5,903,531 AKabushiki Kaisha Toshiba · 1999