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    Focal length transitional method, auxiliary lens for transiting focal lengths, and lens system and finder having focal length transitional function
    6.
    发明授权
    Focal length transitional method, auxiliary lens for transiting focal lengths, and lens system and finder having focal length transitional function 失效
    焦距过渡方法，用于过渡焦距的辅助透镜，以及具有焦距过渡功能的透镜系统和取景器

    公开(公告)号：US5408361A

    公开(公告)日：1995-04-18

    申请号：US972325

    申请日：1992-11-05

    申请人： Noriyuki Iwata

    发明人： Noriyuki Iwata

    IPC分类号： G02B15/02 ,  G02B13/02

    CPC分类号： G02B15/02

    摘要： A varifocal lens system is constructed by two or more lens groups and has a function for changing a focal length of the lens system by changing a distance between the lens groups while the position of an image face is constantly held. An auxiliary lens constructed by two lens groups having negative and positive refracting powers is inserted into an increased clearance between lens groups in a shortest focal length state such that a lens group having the negative refracting power is located on an object side. The focal length of the lens system is transited to the side of a focal length shorter than the shortest focal length without changing the position of the image face by the insertion of the auxiliary lens. The auxiliary lens can be constructed by a single lens group having negative refracting power. In accordance with the above structure, focal lengths of the varifocal lens system can be transited to each other without increasing an entire length of the varifocal lens system.

    摘要翻译： 变焦透镜系统由两个或更多个透镜组构成，并且具有通过改变透镜组之间的距离来改变透镜系统的焦距的功能，同时保持图像面的位置。 由具有负折射力和正折射率的两个透镜组构成的辅助透镜以最短焦距状态插入到透镜组之间的增大的间隙中，使得具有负折射光焦度的透镜组位于物体侧。 透镜系统的焦距被转换到短于最短焦距的焦距侧，而不通过插入辅助透镜来改​​变图像面的位置。 辅助透镜可以由具有负折射力的单个透镜组构成。 根据上述结构，变焦透镜系统的焦距可以相互转换，而不增加变焦透镜系统的整个长度。

    Spark-ignition gasoline engine
    8.
    发明授权
    Spark-ignition gasoline engine 有权
    火花点火汽油机

    公开(公告)号：US07784443B2

    公开(公告)日：2010-08-31

    申请号：US12362645

    申请日：2009-01-30

    申请人： Mitsuo Hitomi ,  Noriyuki Iwata ,  Masahisa Yamakawa ,  Toshiaki Nishimoto ,  Takashi Yohso ,  Takayoshi Hayashi

    发明人： Mitsuo Hitomi ,  Noriyuki Iwata ,  Masahisa Yamakawa ,  Toshiaki Nishimoto ,  Takashi Yohso ,  Takayoshi Hayashi

    IPC分类号： F02P5/15 ,  F02B75/10

    CPC分类号： F02P5/151 ,  F02D13/0223 ,  F02D13/0269 ,  F02D15/04 ,  F02D37/02 ,  F02D41/0002 ,  F02D41/3029 ,  F02D41/402 ,  F02D2041/001 ,  F02P5/1512 ,  Y02T10/142 ,  Y02T10/42 ,  Y02T10/44 ,  Y02T10/46

    摘要： A spark-ignition gasoline engine having at least a spark plug, the engine including an engine body having a geometrical compression ratio set at 14 or more, and an intake valve and an exhaust valve provided, respectively, in intake and exhaust ports connected to each of a plurality of cylinders of the engine body. The intake and exhaust valves are adapted to open and close corresponding respective ones of the intake and exhaust ports. The engine further includes an operation-state detector adapted to detect an operation state of the engine body and a control system adapted, based on detection of the operation-state detector, to perform at least an adjustment control of an ignition timing of the spark plug, the control system being operable, when an engine operation zone is a high-load operation zone including a wide open throttle region within at least a low speed range, to retard the ignition timing to a point within a predetermined stroke range just after a top dead center of a compression stroke.

    摘要翻译： 具有至少火花塞的火花点火汽油机，所述发动机包括具有设定在14以上的几何压缩比的发动机主体，以及分别设置在连接到每个的进气和排气口的进气门和排气门 的发动机主体的多个气缸。 进气门和排气门适于打开和关闭相应的进气口和排气口。 发动机还包括适于检测发动机主体的运行状态的操作状态检测器和控制系统，该控制系统基于操作状态检测器的检测，至少对火花塞的点火正时进行调节控制 所述控制系统可操作，当发动机操作区域是包括至少低速范围内的大开度节流区域的高负载运行区域时，将点火正时延迟到正好在顶部之后的预定行程范围内的点 压缩冲程的死点。