Inventor
Keiji Ohsawa
Inventor
Tokyo, JP
Overview
Patents· 17 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G02Bprimary
G02BOptical elements, systems or apparatus67%
G03BApparatus or arrangements for taking photographs or for projecting or viewing them33%
PatentTitleYear
5,612,762'Focus detection device for a camera'19975,576,896'Structure for attaching a lens to prevent distortion from changes in the ambient conditions'19965,572,013'Focus detection apparatus with a light shielding member'19965,561,492'Camera system using remote control unit'19965,546,157'Focus state detection device'19965,530,513'Focus detecting device and method of operation'19965,506,399'Focus detection device'19965,500,708'Focus detection device having infrared filter'19965,500,519'Focus detection device and method of adjusting focus detection device comprising independent pupil adjustment of moveable field lenses'19965,499,074'Autofocus camera'19965,393,969'Device for detecting focus at different areas of an image field'19955,361,119'Focus state display device for camera'19945,122,827'Camera provided with an attitude detecting device'19924,972,222'Exposure controlling apparatus for camera'19904,833,494'Single lens reflex camera having replaceable view finder'19894,775,229'Fresnel lens in a finder optical system'19884,437,747'Device for mounting an electronic flash unit'1984Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1984–1988Patents assigned to NIPPON KOGAKU KK (2)· patent assignee history
1984–1997Based in Yokohama, JP· patent location history
1989–1997Patents assigned to NIKON CORP (15)· patent assignee history
1995–1996Based in Tokyo, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| NIKON CORP | 15 | 1989–1997 |
| NIPPON KOGAKU KK | 2 | 1984–1988 |
Locations
| Location | Patents | Span |
|---|---|---|
| Tokyo, JP | 9 | 1995–1996 |
| Yokohama, JP | 8 | 1984–1997 |