Inventor

Tatsumaro Yamashita

Inventor

Miyagi, JP

Overview

52→

Patents

1986–2021

Patent span

Physics

Primary field (CPC G)

Patents· 52 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G11Bprimary

G11BInformation storage based on relative movement between record carrier and transducer40%

G02BOptical elements, systems or apparatus13%

H04NPictorial communication, e.g. television6%

B60RVehicles, vehicle fittings, or vehicle parts, not otherwise provided for4%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein4%

G06VImage or video recognition or understanding4%

B60KArrangement or mounting of propulsion units or of transmissions in vehicles2%

G01BMeasuring length, thickness or similar linear dimensions2%

G03BApparatus or arrangements for taking photographs or for projecting or viewing them2%

G06FElectric digital data processing2%

PatentTitleYear

11,043,789Light emitting device2021 11,018,471Method of producing light emitting device2021 10,041,787Object detection device2018 9,760,774'Line-of-sight detection apparatus'2017 9,599,463'Object detection device'2017 9,141,185'Input device'2015 8,570,188'Driver vision support system and vehicle including the system'2013 8,134,608'Imaging apparatus'2012 7,811,010'Camera apparatus with positioning tube and mounting base'2010 7,471,465'Optical apparatus'2008 7,423,824'Actuator, optical apparatus using actuator, and method of manufacturing actuator'2008 7,298,561'Optical device'2007 7,275,853'Illuminating device, light guide body and liquid crystal display device'2007 7,177,103'Optical lens adjusting device and adjusting method thereof'2007 7,040,796'Illumination device and liquid crystal display device'2006 7,025,482'Light guide member and illuminating device'2006 6,751,186'Optical disk cartridge'2004 6,734,929'Illumination device having a single light source and liquid crystal display device'2004 6,664,998'Compound optical device, compound optical unit including the compound optical device, and optical pickup apparatus including the compound optical unit'2003 6,628,593'Disk drive using plural optical heads, capable of identifying the types of media'2003 6,621,771'Disk drive with an objective lens disposed in an optical head moving along a transfer line not intersecting the center of rotation of a disk'2003 6,560,188'Compound optical unit mounted on optical device'2003 6,424,617'Optical disk cartridge'2002 6,418,114'Optical disk cartridge'2002 6,411,446'Device for securing optical element'2002 6,396,800'Optical disk cartridge'2002 6,392,986'Optical disk cartridge'2002 6,301,214'Disk device'2001 6,222,690'Tape speed sensor, control circuit using tape speed sensor and method of controlling tape speed sensor using control circuit'2001 6,130,744'Optical disk discriminating method, including memory storage, for automatic multiple-disk changer'2000 6,127,677'Optical encoder having optical conductor at the outer circumference of rotor'2000 6,052,351'Disk device'2000 6,009,069'Disk package capable of loading a disk package containing multiple disks of different types and locking mechanism dependent on individual disk type'1999 5,987,000'Disc package'1999 5,982,734'Disk package'1999 5,978,340'Compact switching means for driving a recording medium'1999 5,963,534'Driving device for a recording medium'1999 5,959,950'Disk drive capable of loading a disk package containing multiple disks of different types and locking mechanism dependent on individual disk type'1999 5,959,949'Disk package for storage of multiple disks of different types and locking mechanism dependent on individual disk type'1999 5,886,961'Optical disk device capable of accessing a plural different types of optical disks'1999 5,490,018'Data processing apparatus having a digital recording and reproducing system and an analog reproducing system'1996 5,349,479'Data transfer method of magnetic recording/reproducing apparatus'1994 5,345,345'Rotary head type magnetic recording/reproducing unit'1994 5,136,442'Cassette loading device of a tape player utilizing power from capstan motor'1992 5,063,466'Rotary head type magnetic recording and reproducing apparatus'1991 5,021,900'Tape guide driving device for rotating head type tape player'1991 5,018,036'Rotary head type magnetic recording and reproducing apparatus with dedicated recording and reproducing magnetic heads'1991 4,924,325'Head position controlling method'1990 4,709,287'Head height adjustment construction in magnetic recording and reproducing apparatus with rotary cylinder'1987 4,669,002'Multiple magnetic head rotary transducer drum for simultaneous recording and reproducing'1987 4,649,306'Direct drive motor having adjustable bearing for spindle'1987 4,623,944'Magnetic tape guide drum with grounding device'1986

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1986–2018Patents assigned to ALPS ELECTRIC CO LTD (50)· patent assignee history

1986–2018Based in Miyagi, JP· patent location history

1987–1994Based in Shibata, JP· patent location history

2004Based in Fukushima, JP· patent location history

2012–2013Patents assigned to YAMASHITA TATSUMARO (2)· patent assignee history

2012Patents assigned to KAMATA TOMOYA (1)· patent assignee history

2015Based in Tokyo, JP· patent location history

2021Patents assigned to NICHIA CORP (2)· patent assignee history

2021Based in Komatsushima, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
ALPS ELECTRIC CO LTD	50	1986–2018
NICHIA CORP	2	2021
YAMASHITA TATSUMAROself	2	2012–2013
KAMATA TOMOYA	1	2012

Locations

Location	Patents	Span
Miyagi, JP	39	1986–2018
Shibata, JP	7	1987–1994
Komatsushima, JP	2	2021
Tokyo, JP	1	2015
Fukushima, JP	1	2004