VARIABLE MAGNIFICATION OPTICAL SYSTEM AND IMAGE-CAPTURING DEVICE

WIPO Patent Application WO/2013/031214

A1

[Problem] To satisfactorily correct chromatic differences of magnification in a variable magnification optical system when an extender is inserted. [Solution] This variable magnification optical system comprises: a relay lens group (fifth lens group (G5)) comprising a relay front group (G5f) and a relay rear group (G5r) that are separated from one another by a predetermined air space, the relay lens group being fixed when the magnification is varied and having an image-forming effect; and an extender lens group (Ext) that is provided insertably/removably between the relay front group (G5f) and the relay rear group (G5r) and that extends the focal distance toward the telephoto side without changing the image-forming position. The extender lens group (Ext) comprises, in order from the object side: a first lens group (EG1) having a positive refractive power; and a second lens group (EG2) having a negative refractive power. The second lens group (EG2) is a cemented lens comprising, in order from the object side: a convex-meniscus lens (EL21); a biconcave lens (EL22); and a convex-meniscus lens (EL23).

WO/2018/075812	SYSTEMS AND METHODS FOR DETERMINING PHYSIOLOGICAL INFORMATION WITH A COMPUTING DEVICE
JP2000292695	ATTACHMENT LENS
JPS61111	[Title of the device] Macro lens

IKEDA SHINKICHI (JP)
SHIMADA YASUTAKA (JP)

PCT/JP2012/005444

March 07, 2013

August 29, 2012

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FUJIFILM CORP (JP)
IKEDA SHINKICHI (JP)
SHIMADA YASUTAKA (JP)

G02B15/10; G02B13/18; G02B15/167; G02B15/20

JP2011075646A	2011-04-14
JP3513264B2	2004-03-31
JPH08297244A	1996-11-12
JPS6317423A	1988-01-25
JPS6191613A	1986-05-09

YANAGIDA, Masashi et al. (JP)
Seiji Yanagida (JP)

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