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    • 3. 发明授权
    • Zoom lens system
    • 变焦镜头系统
    • US5543970A
    • 1996-08-06
    • US197006
    • 1994-02-15
    • Kazuyoshi HataYukio MaekawaKatsuhiro TakamotoManami Saka
    • Kazuyoshi HataYukio MaekawaKatsuhiro TakamotoManami Saka
    • G02B15/173G02B15/14G02B13/18
    • G02B15/173
    • A zoom lens system according to the present invention comprises, from the object side to the image side, a first lens unit with a positive refractive power including a negative high dispersion lens element and a positive lens element; a second lens unit with a negative refractive power consisting of two or three lens elements including a positive high dispersion lens element and a negative lens element, and having at least one aspherical surface; and a third lens unit with a positive refractive power consisting of five or less lens elements including a negative high dispersion lens element and one or two positive lens elements located on the object side of the negative high dispersion lens element, and having at least one aspherical surface. With the lens arrangement, a compact high-zoom-ratio zoom lens system having a high aberration correction performance is realized.
    • 根据本发明的变焦透镜系统包括从物体侧到像侧,具有包括负高分散透镜元件和正透镜元件的正折光力的第一透镜单元; 具有负折射力的第二透镜单元,由具有正高分散透镜元件和负透镜元件的两个或三个透镜元件组成,并具有至少一个非球面; 以及具有正折射光焦度的第三透镜单元,其由五个或更少的透镜元件组成,所述透镜元件包括负高分散透镜元件和位于负高分散透镜元件的物体侧上的一个或两个正透镜元件,并且具有至少一个非球面 表面。 利用透镜布置,实现了具有高像差校正性能的紧凑型高变焦比变焦透镜系统。
    • 5. 发明授权
    • Focus detecting device
    • 对焦检测装置
    • US4878079A
    • 1989-10-31
    • US226932
    • 1988-08-01
    • Masataka HamadaToshihiko KarasakiToru MatsuiYukio Maekawa
    • Masataka HamadaToshihiko KarasakiToru MatsuiYukio Maekawa
    • G02B7/34G02B7/28G02B7/38G03B13/36
    • G02B7/38
    • A focus detecting device capable of correcting an error, between an in-focus position of a photographic lens detected by a focus detecting means and an image field position affording the best image. Focus detection is made using plural focus detecting areas provided on and off the optical axis of the photographic lens, to obtain an in-focus position. Then, the thus-obtained in-focus position of the photographic lens is corrected using an appropriate correction value out of those preset and stored in a ROM in the lens according to whether the focus detecting area used in the focus detection is an axial or off-axial area, or according to the focal length of the photographic lens as well as the photographing mode. And the photographic lens is thereby set to the best image field position.
    • 一种能够校正由焦点检测装置检测到的摄影镜头的对焦位置和提供最佳图像的图像场位置之间的误差的焦点检测装置。 利用在摄影镜头的光轴上设置的多个焦点检测区域进行聚焦检测,以获得对焦位置。 然后,根据在焦点检测中使用的焦点检测区域是轴向还是关闭,利用预先设定的并存储在镜头中的ROM中的适当的校正值来校正由此获得的摄影镜头的对焦位置 同轴面积,或根据摄影镜头的焦距以及拍摄模式。 因此,摄影镜头被设置为最佳图像场位置。
    • 6. 发明授权
    • Silver halide photographic light-sensitive materials
    • 卤化银照相感光材料
    • US4847186A
    • 1989-07-11
    • US57718
    • 1987-06-01
    • Yasuo MukunokiYukio Maekawa
    • Yasuo MukunokiYukio Maekawa
    • C09K3/16G03C1/38G03C1/85G03C1/89
    • G03C1/89G03C1/385G03C1/85G03C1/895
    • A silver halide photographic light-sensitive material comprising a support and at least one silver halide emulsion layer, wherein at least one of said emulsion layers or another layers which constitutes said material contains a surface active agent represented by the following general formula: ##STR1## wherein Rf represents a saturated or unsaturated hydrocarbon group having 3 to 24 carbon atoms wherein all or a part of hydrogen atoms is substituted by a fluorine atom, R.sub.1 represents a substituted or unsubstituted saturated or unsaturated hydrocarbon group having 4 to 24 carbon atoms, A represents a trivalent bonding group, B represents a divalent group having an ether bond, D represents a hydrophilic group, and n represents an integer of 2 to 100.
    • 一种卤化银照相感光材料,其包含载体和至少一种卤化银乳剂层,其中构成所述材料的所述乳剂层或其它层中的至少一个含有由以下通式表示的表面活性剂: 其中Rf表示碳原子数为3〜24的饱和或不饱和烃基,其全部或部分氢原子被氟原子取代,R 1表示取代或未取代的碳原子数4〜24的饱和或不饱和烃基,A表示 三价键合基团,B表示具有醚键的二价基团,D表示亲水基团,n表示2〜100的整数。
    • 7. 发明授权
    • Bayonet mount arrangement
    • 刺刀安装
    • US4659203A
    • 1987-04-21
    • US645144
    • 1984-08-28
    • Masatake NiwaYukio Maekawa
    • Masatake NiwaYukio Maekawa
    • F16B21/04G02B7/14G03B17/14G02B7/02
    • G02B7/14G03B17/14
    • An interchangeable lens unit is detachably attachable to a camera main body through an improved bayonet arrangement which includes three sets of corresponding bayonet claws, one of the corresponding bayonet claws of each set being provided on a mount member of the lens unit and the other on a mount member of the camera main body. The bayonet claws of the three sets are formed, in mutual dimension and dispositions thereof, such that the corresponding bayonet claws of one of the sets engage one another at an upper peripheral part of the mount members immediately above the center of the mount members and the corresponding bayonet claws of the remaining two sets engage one another respectively at lateral side peripheral parts of the mount members diametrically opposite to one another with respect to the center of the mount members in the lateral direction, when the camera main body and the lens unit attached thereto are viewed from their front with the camera main body held in a normal erect state. The camera main body is provided with a spring member which can urge the bayonet claws on the mount member of the lens unit for ensuring contact between the mating mount surfaces of the mount members.
    • 可互换透镜单元通过改进的卡口装置可拆卸地附接到照相机主体,该卡口装置包括三组对应的卡口爪,每组的相应卡口爪中的一个设置在透镜单元的安装构件上,另一个在一个 摄像机主体的安装成员。 这三个组的卡口爪的相互尺寸和配置形成为使得这些组中的一个组件的相应卡口爪在安装构件的中心正上方的安装构件的上周边部分彼此接合,并且 当照相机主体和透镜单元附接时,剩余两组的相应卡口爪分别相对于安装构件的横向方向的中心彼此径向相对的安装构件的横向侧周边部分彼此接合 从相机主体保持正常的直立状态,从其前方观察。 相机主体设置有弹簧构件,其可以推动透镜单元的安装构件上的卡口爪,以确保安装构件的配合安装表面之间的接触。