Inventor

Yasuyuki Tejima

Inventor

Tokyo, JP

Overview

37→

Patents

1979–2011

Patent span

Physics

Primary field (CPC G)

Patents· 37 as inventor

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

G02Bprimary

G02BOptical elements, systems or apparatus46%

G03BApparatus or arrangements for taking photographs or for projecting or viewing them18%

H04NPictorial communication, e.g. television16%

G01CMeasuring distances, levels or bearings5%

F21VFunctional features or details of lighting devices or systems thereof4%

G02CSpectacles4%

B24BMachines, devices, or processes for grinding or polishing2%

F21SNon-portable lighting devices2%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein2%

G03FPhotomechanical production of textured or patterned surfaces, e.g. for printing, for processing of semiconductor devices2%

PatentTitleYear

8,002,416'Distance measuring device and projector including same distance measuring device'2011 7,944,621'Zoom lens system and a projector with the zoom lens system'2011 7,672,065'Lens system and projector utilizing the same'2010 7,623,304'Lens system and projector using the same'2009 7,619,831'Zoom lens and projector unit'2009 7,619,833'Lens system and projector utilizing the same'2009 7,548,379'Zoom lens and projector using zoom lens'2009 7,548,378'Zoom lens and projector using zoom lens'2009 7,545,581'Zoom lens and projector unit'2009 7,529,034'Zoom lens and projector using zoom lens'2009 7,495,841'Zoom lens and projector using zoom lens'2009 7,495,842'Zoom lens and projector unit'2009 7,486,450'Lens system and projector utilizing the same'2009 7,423,812'Zoom lens and projector employing zoom lens'2008 7,394,599'Zoom lens and projector with zoom lens'2008 6,837,580'Progressive power lens'2005 5,651,598'Projector'1997 5,645,334'Projector and focusing method therein'1997 5,600,488'Projection lens assembly and projector'1997 5,442,413'Pupil conjugate-coupling device in projecting optical system'1995 5,353,072'Aspherical spectacle lens'1994 5,305,029'Projector'1994 5,283,599'Apparatus for combining and projecting images'1994 5,274,406'Image projecting device'1993 5,272,570'Illuminating reflection apparatus'1993 5,217,299'Reflection type lighting apparatus'1993 5,038,162'Still camera'1991 5,005,968'Contrast decreasing apparatus in image forming optical system'1991 4,998,191'Illuminating optical device'1991 4,981,352'Projection display device'1991 4,949,115'Automatic focusing projector'1990 4,936,657'Projection type liquid-crystal video display device using a fresnel lens'1990 4,918,476'Still camera'1990 4,905,034'Automatic focusing projector'1990 4,870,442'Auxiliary light projecting apparatus for a focus detecting system'1989 4,771,308'Auxiliary light projecting apparatus for a focus detecting system'1988 4,132,036'Adjusting structure in an aspheric lens grinding apparatus'1979

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1979–1997Patents assigned to ASAHI OPTICAL CO LTD (21)· patent assignee history

1979–2011Based in Tokyo, JP· patent location history

1990–2011Patents assigned to CASIO COMPUTER CO LTD (19)· patent assignee history

2005Patents assigned to PENTAX CORP (1)· patent assignee history

2005Patents assigned to PENTAX SALES CO LTD (1)· patent assignee history

2008Based in Tokorozawa, JP· patent location history

2009Based in Itabashi-ku, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
ASAHI OPTICAL CO LTD	21	1979–1997
CASIO COMPUTER CO LTD	19	1990–2011
PENTAX CORP	1	2005
PENTAX SALES CO LTD	1	2005

Locations

Location	Patents	Span
Tokyo, JP	33	1979–2011
Itabashi-ku, JP	3	2009
Tokorozawa, JP	1	2008