公开(公告)号：US5715097A

公开(公告)日：1998-02-03

申请号：US652794

申请日：1996-05-23

申请人： Atsushi Shibayama ,  Takanori Fujita ,  Masatoshi Suzuki

发明人： Atsushi Shibayama ,  Takanori Fujita ,  Masatoshi Suzuki

IPC分类号： G02B13/18 ,  G02B15/16 ,  G02B15/177 ,  G02B15/20 ,  G02B27/64 ,  G02B15/14 ,  G02B15/22

CPC分类号： G02B15/177 ,  G02B27/646

摘要： A zoom lens structured so that a substantially constant amount of movement of a focusing lens group is required for focusing on objects at the same distance regardless of the zoom position even when an inner focusing method is implemented. The zoom lens includes in order from an object side, a first lens group which has a negative refractive power and a second lens group which has a positive refractive power, wherein zooming is executed by changing a distance between the first lens group and the second lens group, wherein the second lens group includes, in order from the object side, a front group which has a positive refractive power and a rear group which has a positive refractive power, and wherein focusing from an object at a far distance to an object at a close distance is executed by moving the front group towards an image side.

摘要翻译： 变焦透镜被构造成使得即使实现内部聚焦方法，聚焦透镜组的运动也需要大致恒定的聚焦在相同距离的物体上而与变焦位置无关。 变焦透镜从物体侧依次包括具有负折光力的第一透镜组和具有正折光力的第二透镜组，其中通过改变第一透镜组和第二透镜之间的距离来执行变焦 组，其中所述第二透镜组从物体侧依次包括具有正折射光焦度的正面组和具有正折射光焦度的后组，并且其中从远距离的物体聚焦到物体 通过将前组移动到图像侧来执行近距离。

公开(公告)号：US5585970A

公开(公告)日：1996-12-17

申请号：US418768

申请日：1995-04-07

申请人： Atsushi Shibayama

发明人： Atsushi Shibayama

IPC分类号： G02B15/177 ,  G02B15/14 ,  G02B3/02

CPC分类号： G02B15/177

摘要： A zoom lens with a high zoom ratio has, in the following order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power, and attains zooming from the wide-angle end to the telephoto end by reducing the air gap between the first and second lens units, extending the air gap between the second and third lens units, and reducing the air gap between the third and fourth lens units.

摘要翻译： 具有高变焦比的变焦透镜从物体侧起依次具有具有负屈光力的第一透镜单元，具有正折光力的第二透镜单元，具有负折光力的第三透镜单元，以及 具有正折射力的第四透镜单元，并且通过减小第一和第二透镜单元之间的气隙，延伸第二和第三透镜单元之间的气隙并且减小了从广角端到望远端的变焦 第三和第四透镜单元之间的气隙。

公开(公告)号：US5557470A

公开(公告)日：1996-09-17

申请号：US243409

申请日：1994-05-16

申请人： Atsushi Shibayama

发明人： Atsushi Shibayama

IPC分类号： G02B13/18 ,  G02B15/173 ,  G02B15/20 ,  G02B15/14

CPC分类号： G02B15/173

摘要： A zoom lens system includes a first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a positive refracting power and a fourth lens group having a positive refracting power. These lens groups are arranged in this order as viewed from an object. During zooming operation from the wide angle end to the telephoto end of the zoom lens system, the air space between the first and second lens groups increases and the air space between the third and fourth lens groups decreases. A focal length equal to the diagonal line of the effective image plane of the zoom lens system is included in the zooming range of the zoom lens system. The zoom lens system is formed so as to satisfy various conditions for making the zoom lens system small and giving a high zoom ratio.

摘要翻译： 变焦透镜系统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，具有正折射率的第三透镜组和具有正折射光焦度的第四透镜组。 这些透镜组按照从物体观察的顺序排列。 在从变焦透镜系统的广角端到远摄端的变焦操作期间，第一和第二透镜组之间的空气间隙增加，并且第三和第四透镜组之间的空气空间减小。 与变焦透镜系统的有效像面的对角线相等的焦距被包括在变焦透镜系统的变焦范围内。 变焦透镜系统形成为满足使变焦透镜系统变小并且具有高变焦比的各种条件。

公开(公告)号：US5422699A

公开(公告)日：1995-06-06

申请号：US257443

申请日：1994-06-08

申请人： Shigemasa Sato ,  Masaru Muramatsu ,  Sueyuki Oishi ,  Atsushi Shibayama

发明人： Shigemasa Sato ,  Masaru Muramatsu ,  Sueyuki Oishi ,  Atsushi Shibayama

IPC分类号： G02B7/09 ,  G02B7/10 ,  G02B7/28 ,  G03B13/36

CPC分类号： G02B7/282

摘要： This camera includes a control circuit 12 which calculates a movement amount for a focusing lens group Z.sub.1 of a zoom lens 11 based upon the photographic distance R as measured by a distance measurement device 13 and the focal length of the zoom lens 11 as detected by a focal length detection device 15, and a lens driving device 18 which then moves the focusing lens group Z.sub.1 according to this projection amount calculated by the control circuit 12. Thereby it is possible to compensate for focus deviation when zooming.

摘要翻译： 该照相机包括控制电路12，该控制电路12基于由距离测量装置13测量的照相距离R和变焦透镜11的焦距，由变焦镜头11检测到的焦距来计算变焦镜头11的聚焦透镜组Z1的移动量 焦距检测装置15和透镜驱动装置18，然后根据由控制电路12计算的该投影量移动聚焦透镜组Z1。由此，可以在变焦时补偿聚焦偏差。

公开(公告)号：US5353163A

公开(公告)日：1994-10-04

申请号：US912718

申请日：1992-07-13

申请人： Atsushi Shibayama ,  Masahiro Nakatsuji

发明人： Atsushi Shibayama ,  Masahiro Nakatsuji

IPC分类号： G02B15/16 ,  G02B15/14

CPC分类号： G02B15/161

摘要： A wide-angle zoom lens has a first lens group having a positive refracting power and a second lens group having a negative refracting power, which are moved relative to each other along the optical axis so as to attain zooming. The first lens group is constituted in turn from the object side by a front group having a negative refracting power and a rear group having a positive refracting power. The front group has at least one negative lens. The rear group has at least two positive lenses. The zoom lens is constituted to satisfy the following conditions:0.75

摘要翻译： 广角变焦透镜具有正折射率的第一透镜组和具有负折射率的第二透镜组，其相对于彼此沿着光轴移动以获得变焦。 第一透镜组由物体侧依次由具有负折射力的前面组和具有正折射力的后组构成。 前组至少有一个负透镜。 后组至少有两个正透镜。 变焦透镜被构成为满足以下条件：0.75 <| fF / fW | <4，fF <0 0.1

公开(公告)号：US4911539A

公开(公告)日：1990-03-27

申请号：US286656

申请日：1988-12-19

申请人： Teruyoshi Tsunashima ,  Kiyoshi Hayashi ,  Atsushi Shibayama

发明人： Teruyoshi Tsunashima ,  Kiyoshi Hayashi ,  Atsushi Shibayama

IPC分类号： G02B15/16

CPC分类号： G02B15/161

摘要： A zoom lens comprises a first lens group having a positive refractive power and a second lens group having a negative refractive power sequentially from an object to be photographed. The first lens group comprises an aperture, a front group including at least two lens components having a positive refractive power, and a lens component which has a negative refractive power and an object-side lens surface of which has a concave surface directed toward an object side, and a rear group located nearer to an image than the aperture and including at least one lens component having a positive refractive power. The front group is located nearer to the object than the aperture and has a positive refractive power as a whole. The second lens group comprises at least one lens component having a positive refractive power and at least two lens components having a negative refractive power. A relative distance between the first and second lens groups is changed to perform zooming.

摘要翻译： 变焦透镜包括具有正折光力的第一透镜组和从被拍摄对象顺序地具有负折射光焦度的第二透镜组。 第一透镜组包括孔，包括具有正折光力的至少两个透镜部件的前组，以及具有负屈光力的透镜部件，其物侧透镜表面具有朝向物体的凹面 并且包括至少一个具有正折射光焦度的透镜部件。 前组比光圈更靠近物体，整体具有正的屈光力。 第二透镜组包括具有正折光力的至少一个透镜部件和具有负屈光力的至少两个透镜部件。 改变第一和第二透镜组之间的相对距离以执行变焦。