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'''Hiro Moriyasu''' was an engineer who joined Tektronix in 1959 for a career spanning more than 25 years.  
[[File:Hiro_Moriyasu.jpg|thumb|200px|right]]
{{Person
|Names=Hiro Moriyasu
|Birth date=1935
|Birth place=Kure, Hiroshima, Japan
|Death date=17 July 2005
|Death place=Portland, OR
|Countries=Japan;USA
|Affiliations=Tektronix;Electro Scientific, Inc.; Zeelan Technology; Acumar Technology
|Wikidata id=
}} was an engineer who joined Tektronix in June 1956.


He pioneered the digital oscilloscope and other advanced computer technologies, and held more than 20 U.S. patents.  
He pioneered the digital oscilloscope and other advanced computer technologies, and held more than 20 U.S. patents.  
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In the early 1970s, Hiro became the general manager of a new division of Tektronix focused on scientific graphic computing.
In the early 1970s, Hiro became the general manager of a new division of Tektronix focused on scientific graphic computing.


Upon leaving Tektronix, Hiro spent two years at Electro Scientific, Inc., co-founded  
Upon leaving Tektronix in June 1986, Hiro spent two years at Electro Scientific, Inc., co-founded Zeelan Technology in 1990 (acquired by Mentor in 1996) and founded of Acumar Technology in 1998 (acquired by Lafayette Instruments in 2006).
Zeelan Technology in 1990 (acquired by Mentor in 1996) and founded of Acumar Technology  
in 1998 (acquired by Lafayette Instruments in 2006).


Moriyasu was born in [https://en.wikipedia.org/wiki/Kure,_Hiroshima Kure, Hiroshima, Japan].  He came to the United States in 1953 as an electrical engineering student at Oregon State University.  He died in Portland, Oregon on 17 July 2005, aged 70.
Moriyasu was born in [https://en.wikipedia.org/wiki/Kure,_Hiroshima Kure, Hiroshima, Japan].  He came to the United States in 1953 as an electrical engineering student at Oregon State University.   
He died in Portland, Oregon on 17 July 2005, aged 70.
 
==Links==
* [https://vintagetek.org/hiro-moriyasu/ Hiro Moriyasu] @ vintagetek.org
* [https://vintagetek.org/wp-content/uploads/2017/12/InventorsBanquet_TW_05111984.pdf Tek inventors recognized at banquet] (1984)
* [http://www.spokesman.com/stories/2005/jul/24/digital-oscilloscope-inventor-moriyasu-dies/ Digital oscilloscope inventor Moriyasu dies] (AP, 2005)
* [http://engineering.oregonstate.edu/hiro-moriyasu-2006-engineering-hall-fame Hiro Moriyasu: Engineering Hall of Fame] (2006)
* [[Barrie Gilbert]], [https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4785651 ''The Gears of Genius''] in IEEE SCCS News (2007)


==Products==
==Products==
* Key designer of [[4051]] computer
* Key designer of [[4051]] computer
* Key designer of [[P7001]] digitizer
* Likely designer of [[X381]] plug-in (history uncertain)
* ... ''please add''
* ... ''please add''


==Patents==
<gallery>
* [https://patents.google.com/patent/US3325742A US3325742A: Hybrid amplifier circuit] (filed 1963-08-06, granted 1967-06-13)
Hiro_Moriyasu.jpg
* [https://patents.google.com/patent/US3441863A US3441863A: Drift compensated direct coupled amplifier circuit having adjustable d.c. output voltage level] (filed 1965-08-02, granted 1969-04-29)
Hiro_Moriyasu_1970.jpg
* [https://patents.google.com/patent/US3439282A US3439282A: Time base generator with automatic rate control] (filed 1965-08-20, granted 1969-04-15)
</gallery>
* [https://patents.google.com/patent/US3473044A US3473044A: Monostable comparator circuit] (filed 1965-12-13, granted 1969-10-14)
* [https://patents.google.com/patent/US3408580A US3408580A: Oscilloscope device exhibiting reduced jitter] (filed 1966-03-17, granted 1968-10-29)
* [https://patents.google.com/patent/US4225940 US4225940: Oscilloscope system for acquiring, processing, and displaying information] (filed 1978-10-02, granted 1980-09-30) (Tektronix, with [[Jack Gilmore]], [[Willem Velsink]], [[Luis Navarro]])
* [https://patents.google.com/patent/US5444459 US5444459: Signal acquisition system utilizing ultra-wide time range time base] (filed 1993-06-22, granted 1995-08-22) (Zeelan Technology)
* [https://patents.google.com/patent/US5349539 US5349539: Behavioral model parameter extractor] (filed 1991-10-28, granted 1994-09-20) (Zeelan Technology)
* [https://patents.google.com/patent/US5243343 US5243343: Signal acquisition system utilizing ultra-wide time range time base] filed 1990-12-03, granted 1993-09-07) (Zeelan Technology)
* [https://patents.google.com/patent/US5034698 US5034698: Dual-path wideband and precision data acquisition system] filed 1990-01-22, granted 1991-07-23)
* ... ''please add''


==Links==
{{Documents|Author=Hiro Moriyasu}}
* [http://vintagetek.org/wp-content/uploads/2017/12/InventorsBanquet_TW_05111984.pdf Tek inventors recognized at banquet (1984)]
{{Designer|Hiro Moriyasu}}
* [http://www.spokesman.com/stories/2005/jul/24/digital-oscilloscope-inventor-moriyasu-dies/ Digital oscilloscope inventor Moriyasu dies (AP, 2005)]
{{Patents|Hiro Moriyasu}}
* [http://engineering.oregonstate.edu/hiro-moriyasu-2006-engineering-hall-fame Hiro Moriyasu : Engineering Hall of Fame - 2006]
* [https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4785651 [[Barrie Gilbert]], ''The Gears of Genius'', in IEEE SCCS News, 2007]


[[Category:Tektronix people]]
[[Category:Tektronix people]]
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