Jun Hirakawa

Mr. Jun Hirakawa (平川純) is a Japanese lens designer best known for creating the Pentax FA 43mm Limited and FA 77mm Limited lenses during his time at Pentax.[1]

Hirakawa said at the time that he regretted his "early retirement" from Pentax in 2010, around the time that Hoya acquired the company, and was subsequently hired by Tamron.[2]

List of credited lens designs

Hirakawa is credited with designing:

gollark: It says "EdDSA-like digital signatures", which implies that it may not actually be something available outside of CC.
gollark: It would be neat if they were cryptographically signed too, but it turns out I have no idea what actual algorithm the potatOS ECC library is implementing, oops.
gollark: So, progress on the potatoupdates™ system, I now have a script generating manifest files which are deterministically generated from the exact contents of a PotatOS version™.
gollark: > multiprocessing.pool objects have internal resources that need to be properly managed (like any other resource) by using the pool as a context manager or by calling close() and terminate() manually. Failure to do this can lead to the process hanging on finalization.> Note that is not correct to rely on the garbage colletor to destroy the pool as CPython does not assure that the finalizer of the pool will be called (see object.__del__() for more information).Great abstraction there, Python. Really great.
gollark: No, I mean I was reading from underneath the line it highlighted, which was the POST documentation.

References
  1. RiceHigh (6 October 2010). "The Very Different Fates of Two ex-AOC Top Optical Engineers". RiceHigh's Pentax Blog. Retrieved 8 November 2017.
  2. RiceHigh (8 July 2013). "News: Mr. Jun Hirakawa Now Works for Tamron and Mr. Blurry Cameraphone has Left Pentax China". RiceHigh's Pentax Blog. Retrieved 8 November 2017.
  3. US patent 7317581B2, Ito, Takayuki & Hirakawa, Jun, "Fisheye lens system and a fisheye zoom lens system", published 2008-01-08, issued 2008-01-08, assigned to Pentax Corp
  4. US patent 7116499B2, Hirakawa, Jun, "Wide-angle lens system", issued 2006-10-03, assigned to Pentax Corp
  5. https://www.pentaxforums.com/lensreviews/SMC-Pentax-DA-40mm-F2.8-Limited-Pancake-Lens.html
  6. US patent 5724193A, Hirakawa, Jun, "Super wide angle zoom lens", published 1998-03-03, issued 1998-03-03, assigned to Pentax Corp
  7. US patent 5546232A, Hirakawa, Jun, "Two-group zoom lens", issued 1996-08-13, assigned to Pentax Corp
  8. US patent 4904070A, Hirakawa, Jun, "Telephoto lens system", issued 1990-02-27, assigned to Pentax Corp
  9. US patent 5264965A, Hirakawa, Jun, "Zoom lens", issued 1993-11-23, assigned to Pentax Corp
  10. US patent 5233474A, Hirakawa, Jun, "Wide-angle lens system", issued 1993-08-03, assigned to Pentax Corp
  11. US patent 5822132A, Hirakawa, Jun, "Soft focus lens", issued 1998-10-13, assigned to Pentax Corp
  12. http://gw.org.za/images/Lens%20Technical%20and%20Trial%20Use%20Reports.%20SMC%20Pentax%20FA77mm%20and%20FA43mm.%20Hirakawa%20Jun%20and%20Adachi%20Masamitsu,%202000.pdf
  13. US patent 5061053A, Hirakawa, Jun, "Telephoto zoom lens system", issued 1991-10-29, assigned to Pentax Corp
  14. https://www.instagram.com/p/BXiYaBsg8p7/
  15. US patent 5546232A, Hirakawa, Jun, "Wide-angle lens system of a retrofocus type", issued 1990-06-19, assigned to Pentax Corp
  16. US patent 4934797A, Hirakawa, Jun, "Inner focus type telephoto zoom lens", issued 1996-11-05, assigned to Pentax Corp
  17. US patent 5172274A, Hirakawa, Jun, "Large aperture, medium telephoto lens system", issued 1992-12-15, assigned to Pentax Corp
  18. JP patent 5722730B2, 純 平川, "The camera shake correction zoom lens", issued 2015-05-27, assigned to 株式会社タムロン
  19. RiceHigh (16 August 2011). "RiceHigh's Pentax Blog: Some "Lost Stories" About the Three FA Limited Lenses". Ricehigh.blogspot.com. Retrieved 30 March 2018.
  20. US patent 4747676A, Hirakawa, Jun, "Wide-angle seven-element lens system", issued 1988-05-31, assigned to Pentax Corp
  21. US patent 4836663A, Hirakawa, Jun, "Telephoto zoom lens system", issued 1989-06-06, assigned to Pentax Corp
  22. US patent 5448412A, Maruyama, Koichi & Hirakawa, Jun, "Telephoto zoom lens system", issued 1995-09-05, assigned to Pentax Corp


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