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    • 31. 发明授权
    • Zoom lens
    • 变焦镜头
    • US5000551A
    • 1991-03-19
    • US532792
    • 1990-06-04
    • Atsushi Shibayama
    • Atsushi Shibayama
    • G02B15/173
    • G02B15/173
    • A zoom lens comprises, in succession from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power, and is designed such that during the magnification change from the wide angle end to the telephoto end, the air space between the first lens group and the second lens group is enlarged, the air space between the second lens group and the third lens group is reduced and further, the air space between the third lens group and the fourth lens group is varied. The second lens group comprises, in succession from the object side, a negative meniscus lens having its convex surface facing the object side, a biconcave negative lens, and a cemented positive lens consisting of a biconvex positive lens and a biconcave negative lens cemented together, and is designed to satify the following conditions: ##EQU1##
    • 变焦透镜从物体侧依次包括具有正折光力的第一透镜组,具有负屈光力的第二透镜组,具有正折光力的第三透镜组,以及具有正折光力的第四透镜组 并且被设计成使得在从广角端到望远端的放大率变化期间,第一透镜组和第二透镜组之间的空气空间被扩大,第二透镜组和第三透镜之间的空气空间 组进一步减少,第三透镜​​组和第四透镜组之间的空气空间变化。 第二透镜组从物体侧依次包括其凸面朝向物体侧的负凹凸透镜,双凹面负透镜和由双凸正透镜和双凹面负透镜粘合在一起的胶结正透镜, 并设计为满足以下条件:0.44 <| f2 / fw| <0.51
    • 32. 发明申请
    • GREASE COMPOSITION AND BEARING
    • 润滑脂组合物和轴承
    • US20110046030A1
    • 2011-02-24
    • US12095888
    • 2006-12-05
    • Yutaka ImaiYuji OonukiAtsushi Shibayama
    • Yutaka ImaiYuji OonukiAtsushi Shibayama
    • C10M169/02
    • C10M169/02C10M105/38C10M2207/1285C10M2207/2835C10M2215/064C10M2215/223C10M2219/044C10N2210/02C10N2220/022C10N2220/13C10N2240/02C10N2250/10F16C33/6633
    • The present invention provides a grease composition which comprises a base oil and a thickening agent and in which the base oil comprises an ester oil represented by the following general formula (1) and composed of pentaerythritol and a fatty acid, the composition being characterized in that it comprises a pentaerythritol tetra-ester oil in which the fatty acid used for forming the ester, at least, comprises 2-ethyl hexanoic acid in an amount ranging from 51 to 55% by mass and caprylic acid and capric acid in a total amount ranging from 39 to 49% by mass wherein the content of caprylic acid is not less than 30% by mass and that of capric acid ranges from 5 to 10% by mass: C(CH2OCOR1)4, wherein R1 represents a linear and/or branched fatty acid residue having 6 to 12 carbon atoms as well as a bearing comprising the grease composition, filled therein. The grease composition of the present invention is suitably used in the rolling bearing under low temperature conditions and can show stable lubricating performance over a long period of time.
    • 本发明提供一种润滑脂组合物,其含有基础油和增稠剂,其中,所述基础油包含由以下通式(1)表示的由季戊四醇和脂肪酸组成的酯油,其特征在于, 它包括季戊四醇四酯油,其中用于形成酯的脂肪酸至少包含51至55质量%的2-乙基己酸,辛酸和癸酸的总量范围 39至49质量%,其中辛酸的含量不小于30质量%,癸酸的含量为5至10质量%:C(CH 2 OCOR 1)4,其中R 1表示直链和/或支链 具有6至12个碳原子的脂肪酸残基以及填充有润滑脂组合物的轴承。 本发明的润滑脂组合物在低温条件下适用于滚动轴承,能够长时间显示稳定的润滑性能。
    • 36. 发明授权
    • Wide converter lens
    • 宽转换镜头
    • US06504655B2
    • 2003-01-07
    • US09827907
    • 2001-04-09
    • Atsushi Shibayama
    • Atsushi Shibayama
    • G02B1502
    • G02B13/06
    • The object of the present invention is to provide a wide converter lens capable of obtaining an angle of view of about 80° or over and having small appearance of distortion. According to one aspect, a wide converter lens for using by attaching to an object side of a photographic lens includes, in order from the object side, a first positive lens having double convex surfaces, a negative lens unit including at least one negative lens, and a second positive lens having double convex surfaces. The following conditional expression is satisfied: −0.8
    • 本发明的目的是提供一种能够获得约80°或更大视角且具有较小变形外观的宽转换镜。 根据一个方面,用于通过附着到摄影镜头的物体侧使用的宽转换器透镜包括从物体侧开始具有双凸面的第一正透镜,包括至少一个负透镜的负透镜单元, 以及具有双凸面的第二正透镜。 满足以下条件表达式:其中r1表示第一正透镜的物体侧表面的曲率半径,r2表示第一正透镜的像侧表面的曲率半径。
    • 40. 发明授权
    • Zoom lens
    • 变焦镜头
    • US5717527A
    • 1998-02-10
    • US756770
    • 1996-11-26
    • Atsushi Shibayama
    • Atsushi Shibayama
    • G02B15/173G02B15/14
    • G02B15/173
    • A zoom lens comprises a first lens group having a positive refracting power, a second lens group having a negative refracting power, and a third lens group having a positive refracting power, disposed in the named order from the object side, wherein the first lens group has a 1-1 lens group having a negative refracting power and a 1-2 lens group having a positive refracting power, disposed in the named order from the object side, wherein zooming from a wide angle end to a telephoto end is effected by increasing a gap between the first lens group and the second lens group and reducing a gap between the second lens group the third lens group, while fixing the first lens group, wherein focusing from infinity to near is effected by moving the 1-1 lens group to the object side; and wherein the following condition is satisfied: 0.5
    • 变焦透镜包括具有正折射率的第一透镜组,具有负折射光焦度的第二透镜组和具有正折射率的第三透镜组,从物体侧按顺序设置,其中第一透镜组 具有正折射率的1-1透镜组和具有正折射率的1-2透镜组,从物体侧按照命名顺序设置,其中从广角端到望远端的变焦通过增加 第一透镜组和第二透镜组之间的间隙,并且通过将1-1透镜组移动到第一透镜组而将从第一透镜组到第二透镜组之间的间隙缩小到第二透镜组之间的间隙,同时固定第一透镜组,其中通过将1-1透镜组移动到 物体侧 并且其中满足以下条件:0.5