JP2010237250A5

JP2010237250A5 -

Info

Publication number: JP2010237250A5
Application number: JP2009081935A
Authority: JP
Filing date: 2009-03-30
Publication date: 2012-05-17

Description

図２において、２１ａ、２１ｂは１群１１に相当し、２２ａ、２２ｂは２群１２に相当し、２３ａ、２３ｂは３群１３に相当し、２４ａ、２４ｂは４群１４に相当する収差影響度をそれぞれ表している。グラフの上下への量は規定量レンズ群が偏芯した時の収差への影響度の値を示し、上下への方向は収差の出る方向を示し、各レンズ群間の上下方向の出方と量で収差を打ち消すことが出来ることを表している。 In FIG. 2, 21a, 21b corresponds to one group 11, 22a, 22b corresponds to two groups 12, 23a, 23b corresponds to three groups 13, 24a, 24b are aberration influence corresponding to four groups 14 Respectively. The amount of vertical movement in the graph indicates the value of the degree of influence on the aberration when the specified amount of the lens group is decentered. The vertical direction indicates the direction in which the aberration occurs. This shows that the aberration can be canceled by the amount.

図１（Ｂ）からすると、２群１２と４群１４は光軸0２に対して逆方向に偏芯している。そこで４群１４の持っている偏芯量の収差への影響度２４ｂと、２群１２の偏芯量の収差への収差影響度２２ｂとは互いに打ち消す方向に働いていることが分かる。そこで図１（Ｂ）で示す３群１３は２群１２と４群１４と打ち消し合った収差の残りの収差分を補正するように偏芯させる。本実施例では３群１３を２群１２と同じ方向に２群１２の偏芯量よりは少なく偏芯駆動制御させる。これによれば、収差を打ち消すことが出来る。
またここで、１群の収差影響度は大きいが、前述の様に１群前玉レンズ群（１群）はレンズ鏡筒１０１に偏芯無く取り付けられている為、収差の発生は無い。 From FIG. 1B, the second group 12 and the fourth group 14 are eccentric with respect to the optical axis 02 in the opposite direction. Accordingly, it can be seen that the degree of influence 24b of the eccentricity of the fourth group 14 on the aberration and the degree of aberration influence 22b of the eccentricity of the second group 12 on the aberration work in a direction to cancel each other. Therefore, the third group 13 shown in FIG. 1B is decentered so as to correct the remaining aberrations of the aberrations canceled out by the second group 12 and the fourth group 14. In this embodiment, the third group 13 is controlled to be eccentrically driven in the same direction as the second group 12 and less than the eccentric amount of the second group 12. According to this, aberration can be canceled.
Here, although the aberration influence of the first group is large, since the first front lens group (first group) is attached to the lens barrel 101 without decentering as described above, no aberration occurs.