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1. 发明专利

DE10355636A1 未知
公开(公告)号：DE10355636A1
公开(公告)日：2004-06-09
申请号：DE10355636
申请日：2003-11-28
申请人： PENTAX CORP
发明人： ENOMOTO TAKASHI
IPC分类号： G02B15/20 , G02B13/18 , G02B15/173
摘要： A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a negative fourth lens group. Zooming is performed by moving each of the positive first through the negative fourth lens groups along the optical axis. The zoom lens system satisfies the following conditions: 0.5

2. 发明专利

DE19734921B4 未知
公开(公告)号：DE19734921B4
公开(公告)日：2006-07-13
申请号：DE19734921
申请日：1997-08-12
申请人： PENTAX CORP
发明人： ENOMOTO TAKASHI , ITO TAKAYUKI
IPC分类号： G02B15/167 , G02B15/17 , G02B13/16
摘要： A zoom lens system of high zoom ratio includes a first positive lens group, a second negative lens group, a third negative lens group, and a fourth positive lens group, arranged in this order from the object side. The second and third lens groups are moved during zooming while the first and fourth lens groups are stationary during zooming. The lens system satisfies the condition 1

3. 发明专利

DE10103517B4 未知
公开(公告)号：DE10103517B4
公开(公告)日：2006-05-24
申请号：DE10103517
申请日：2001-01-26
申请人： PENTAX CORP
发明人： ENOMOTO TAKASHI , NOMURA HIROSHO , ITO TAKAYUKI , ISHII SHINICHIRO
IPC分类号： G02B15/16 , G02B7/10 , G02B15/163 , G02B15/20
摘要： In a short-focal-length side zooming range, a moveable sub-lens group of a zoom lens system is made stationary at one of the object-side and the image-side end. At the intermediate switching focal length, the moveable sub-lens group is moved to the other of the object-side and the image-side end. In a long-focal-length side zooming range, the moveable sub-lens group is made stationary at the other end, and the zoom lens system satisfies the following condition:whereinmNt designates the transverse magnification of the most image-plane side lens group of the zoom lens system when the moveable sub-lens group is at one end; andmNw designates the transverse magnification of the most image-plane side lens group of the zoom lens system when the moveable sub-lens group is at the other end

4. 发明专利

DE19651764B4 未知
公开(公告)号：DE19651764B4
公开(公告)日：2005-01-13
申请号：DE19651764
申请日：1996-12-12
申请人： PENTAX CORP
发明人： ENOMOTO TAKASHI , ITO TAKAYUKI
IPC分类号： G02B15/16 , G02B15/163 , G02B15/177 , G02B13/06
摘要： A super wide-angle zoom lens includes at least a negative first lens group and a positive second lens group, in this order from an object side. A zooming operation is carried out by relatively moving the lens groups. When a photographing area is defined by a rectangular area, a boundary of a circular image forming area formed by the zoom lens is at least partially disposed in the rectangular photographing area at the shortest focal length of the zoom lens.

5. 发明专利

DE19734919B4 未知
公开(公告)号：DE19734919B4
公开(公告)日：2005-02-10
申请号：DE19734919
申请日：1997-08-12
申请人： PENTAX CORP
发明人： ABE TETSUYA , ITO TAKAYUKI , ENOMOTO TAKASHI
IPC分类号： G02B13/18 , G02B15/167 , G02B15/17 , G02B13/16
摘要： A fast aspherical zoom lens system includes a positive first lens group, a negative second lens group, a negative third lens group, and a positive fourth lens group, arranged in this order from the object side. The lens system includes at least one aspherical surface. When the zooming operation is carried out, the second and third lens groups are moved. The aspherical surface is located at a position in which the following condition is satisfied: HASP/HMAX

6. 发明专利

DE10355635A1 未知
公开(公告)号：DE10355635A1
公开(公告)日：2004-06-09
申请号：DE10355635
申请日：2003-11-28
申请人： PENTAX CORP
发明人： ENOMOTO TAKASHI
IPC分类号： G02B7/10 , G02B15/173 , G02B15/20
摘要： A zoom lens system includes a positive first lens group, a negative second lens group, a positive third lens group, and a negative fourth lens group.Zooming is performed by moving each of the positive first through the negative fourth lens groups along the optical axis.The zoom lens system satisfies the following condition:whereinf23T designates the combined focal length of the negative second lens and the positive third lens groups at the long focal length extremity;f23W designates the combined focal length of the negative second lens and the positive third lens groups at the short focal length extremity;fT designates the focal length of the entire the zoom lens system at the long focal length extremity; andfW designates the focal length of the entire the zoom lens system at the short focal length extremity.

7. 发明专利

JP2006133755A Zoom lens system 审中-公开
标题翻译：变焦镜头系统
公开(公告)号：JP2006133755A
公开(公告)日：2006-05-25
申请号：JP2005291944
申请日：2005-10-05
申请人： Pentax Corp , ペンタックス株式会社
发明人： ENOMOTO TAKASHI
IPC分类号： G02B15/16 , G02B13/18
CPC分类号： G02B15/177
摘要： PROBLEM TO BE SOLVED: To obtain a zoom lens system where the number of lenses and optical performance is well-balanced and which is compact and obtains excellent optical performance though it has a zoom ratio (variable power ratio) being about 3 by adopting negative-leading type two groups which are negative and positive in order from an object side.
SOLUTION: In the zoom lens system, a first lens group comprises two lenses, that is, a negative lens 11 and a positive lens 12 in order from the object side, and a second lens group comprises three lenses, that is, a positive lens 21, a negative lens 22, and a positive lens 23 in order from the object side, and at least the object-side positive lens 21 and the negative lens 22 are cemented together. The zoom lens system satisfies following conditional expressions (1) and (2). (1) 1.5 2G /(f
T /f
W ) 2G (m
W -m
T )/(f
T /f
W ) 2G ; the focal length of the second lens group, f
W ; the focal length of an entire system at a short focal length extremity, f
T ; the focal length of the entire system at a long focal length extremity, m
W ; the lateral magnification of the second lens group at the short focal length extremity, and m
T ; the lateral magnification of the second lens group at the long focal length extremity.
COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：为了获得透镜数量和光学性能良好平衡并且紧凑并且获得优异的光学性能的变焦透镜系统，尽管其变焦比（可变功率比）大约为3，通过从物体侧依次采用负面和正面的负面领先的两组。解决方案：在变焦透镜系统中，第一透镜组从物体侧依次包括两个透镜，即负透镜11和正透镜12，第二透镜组包括三个透镜，即，正透镜21，负透镜22和正透镜23，并且至少物体侧正透镜21和负透镜22粘合在一起。变焦透镜系统满足以下条件式（1）和（2）。（1）1.5 2G /（f T / f W ）<3.0，（2） / SB>（m W -m SB ）/（f T / f SB> W SB）那个f 2G ; 第二透镜组的焦距f W ; 在短焦距末端的整个系统的焦距，f T ; 整个系统的焦距在长焦距端，m W ; 第二透镜组在短焦距端的横向放大率，m T ; 第二透镜组的横向放大倍率在长焦距处。版权所有（C）2006，JPO＆NCIPI

8. 发明专利

JP2005128191A Zoom lens system 审中-公开
标题翻译：变焦镜头系统
公开(公告)号：JP2005128191A
公开(公告)日：2005-05-19
申请号：JP2003362642
申请日：2003-10-23
申请人： Pentax Corp , ペンタックス株式会社
发明人： ENOMOTO TAKASHI
IPC分类号： G02B15/20 , G02B13/18 , G02B15/173
CPC分类号： G02B15/173
摘要： PROBLEM TO BE SOLVED: To increase zoom ratio and make a size small, in a zoom lens system of a four-group type in which positive, negative, positive, and negative powers are disposed in that order from the object side.
SOLUTION: The zoom lens system of the four-group type in which positive, negative, positive, and negative powers are disposed in that order from the object side satisfies the following conditional expressions (1) and (2): (1) 0.35 T23 /f
W23 )/log(f
T /f
W ) W -LD
T )/(f
T /f
W ) 23W (f
23T ) is the composited focal distance of a second lens group and a third lens group at a short (long) focal distant end, f
T (f
W ) is the focal distance of the whole system at the long (short) focal distance end, and LD
W (LD
T ) is a distance from the face of the first lens group nearest to a first lens group to the face of a fourth lens group nearest to the image side at the short (long) focal distance end.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：为了增加变焦比并使尺寸变小，在其中正，负，正和负功率从物体侧按顺序布置的四组类型的变焦透镜系统中。解决方案：从物体侧按顺序设置正，负，正，负功率的四组类型的变焦透镜系统满足以下条件表达式（1）和（2）：（1 ）0.35 W23 ）/ log（f SB）/ f W W -LD SB ）/（f T / f 0.7，其中f 23W（f SB> 23T）是第二透镜组和第三透镜组在短（远）焦距远端的合成焦距，f < SB> T （f W ）是整个系统在长（短）焦距端处的焦距，LD W （LD T ）是距离第一透镜组的最靠近第一透镜组的面的距离在短（长）焦距端处最靠近像侧的第四透镜组的面的距离。版权所有（C）2005，JPO＆NCIPI

9. 发明专利

JP2004184526A Zoom lens system 审中-公开
公开(公告)号：JP2004184526A
公开(公告)日：2004-07-02
申请号：JP2002348571
申请日：2002-11-29
申请人： Pentax Corp , ペンタックス株式会社
发明人： ENOMOTO TAKASHI
IPC分类号： G02B15/20 , G02B13/18 , G02B15/173
CPC分类号： G02B15/173
摘要： PROBLEM TO BE SOLVED: To provide a zoom lens system most suitable for a small-sized collapsible lens shutter camera having 4.5 or more of a zoom ratio and 35° or larger of a semi-field angle at a wide end.
SOLUTION: The zoom lens system is composed of a first positive lens group, a second negative lens group, a third positive lens group, and a fourth negative lens group in order from a matter side, and zoomed by moving each group in an optical axis direction, and composed to satisfy the following conditional equations (1) and (2). The following condition equation (1) is expressed as follows: 0.5 12T -D
12W )/f
W 1G /ΔX
4G 12T is an axial space interval of the first lens group and the second lens group at a tele-end. D
12W is an axial space interval of the first lens group and the second lens group at the wide-end. f
W is a focal length of the whole system at the wide-end. ΔX
1G is a moved amount of the first lens group from the wide-end to the tele-end. ΔX
4G is a moved amount of the fourth lens group from the wide-end to the tele-end.
COPYRIGHT: (C)2004,JPO&NCIPI

10. 发明专利

JP2004078165A Zoom lens system 审中-公开
公开(公告)号：JP2004078165A
公开(公告)日：2004-03-11
申请号：JP2003165275
申请日：2003-06-10
申请人： Pentax Corp , ペンタックス株式会社
发明人： ENOMOTO TAKASHI
IPC分类号： G02B15/16 , G02B13/18
摘要： PROBLEM TO BE SOLVED: To obtain a small-sized zoom lens system for a compact camera which has an about ×3.5 zoom ratio with two-group constitution.
SOLUTION: The zoom system comprises a 1st positive lens group and a 2nd negative lens group in this order from the object side, and satisfies a conditional expression (1): 4.5 T /F
1G T is the focal length at the long-focal-length end and f
1G is the focal length of the 1st lens group.
COPYRIGHT: (C)2004,JPO

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