Variable-focus lens with 1-kHz bandwidth

Hiromasa Oku, Koichi Hashimoto, Masatoshi Ishikawa

Research output: Contribution to journalArticlepeer-review

93 Citations (Scopus)


This paper proposes a variable-focus lens with 1-kHz bandwidth. The lens transforms its shape rapidly using the liquid pressure generated by a piezo stack actuator. This mechanism also includes a built-in motion amplifier with high bandwidth to compensate for the short working range of the piezo stack actuator. Prototypes have been developed to validate the proposed design. A 1-kHz bandwidth of the lenses was confirmed by measuring the frequency responses. Refractive power ranging from -1/167 to 1/129 mm-1 and a maximum resolution of 12.3 cycles/mm were attained.

Original languageEnglish
Pages (from-to)2138-2149
Number of pages12
JournalOptics Express
Issue number10
Publication statusPublished - 2004 May


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