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1. 发明专利

DE19929315B4 未知
公开(公告)号：DE19929315B4
公开(公告)日：2008-06-19
申请号：DE19929315
申请日：1999-06-25
申请人： PENTAX CORP
发明人： OZAKI HIROYASU , ITO TAKAYUKI
IPC分类号： G02B15/177 , G02B15/14 , G02B15/16
摘要： A step zoom lens includes a first movable lens group of negative power, a diaphragm which is immovable during zooming, and a second lens group of positive power. A fundamental zooming path along which the first lens group is moved to vary a focal length without causing an image shift is defined so that the distance of the first lens group from the diaphragm is reduced and is thereafter increased, upon zooming from a wide angle extremity to a telephoto extremity, and a fundamental zooming path along which the second lens group is moved is defined so that the distance of the second lens group from the diaphragm is linearly varied. The discrete stop positions of the first and second lens groups are determined to be different from a focal length position at which the distance between the first lens group and the diaphragm on the fundamental zooming path thereof is minimum or the vicinity thereof.

2. 发明专利

DE19856119B4 未知
公开(公告)号：DE19856119B4
公开(公告)日：2008-04-03
申请号：DE19856119
申请日：1998-12-04
申请人： PENTAX CORP
发明人： MURATA MASAYUKI , ITO TAKAYUKI
IPC分类号： G02B13/00 , G02B5/00 , G02B7/08 , G02B13/24
摘要： A macro lens system includes a positive first lens group, an aperture and a negative second lens group arranged in the order from an object side. The driving mechanism drives the lens groups and the aperture to move independently along an optical axis for focusing. When the lens groups are moved toward the object side, the aperture is also moved to the object side. The moving amount of the aperture is determined to control increasing of an effective F-number. The moving amount of the aperture is smaller than that of the first lens group and is larger than that of the second lens group.

3. 发明专利

DE19652058B4 未知
公开(公告)号：DE19652058B4
公开(公告)日：2006-07-13
申请号：DE19652058
申请日：1996-12-13
申请人： PENTAX CORP
发明人： ITO TAKAYUKI
IPC分类号： G02B13/18 , G02B15/177 , G02B15/16

4. 发明专利

DE10122708B4 未知
公开(公告)号：DE10122708B4
公开(公告)日：2006-03-16
申请号：DE10122708
申请日：2001-05-10
申请人： PENTAX CORP
发明人： ISHII SHINICHIRO , ITO TAKAYUKI
IPC分类号： G02B25/00 , G02B15/14 , G02B15/177 , G02B15/20
摘要： Eyepiece variable focal length optics comprise, in order from the objective optics, a negative lens group, a positive lens group, a positive lens group and a positive lens group; during variable focal length from longest focal length side to shortest focal length side, the first lens group moves monotonically toward the objective optics, the second lens group moves monotonically toward the eye, and the third lens group moves toward the eye in such a way that the distance from the second lens group is first increased and then decreased; the fourth lens group is stationary. The eyepiece variable focal length optics further satisfies the following condition (1):whereL23 (max): a maximum value of the axial air gap between the second and third lens groups during variable focal length;L23: the axial air gap between the second and third lens groups at longest focal length state;f(h): the shortest focal distance of the overall eyepiece variable focal length optics.

5. 发明专利

DE4440398B4 未知
公开(公告)号：DE4440398B4
公开(公告)日：2006-01-19
申请号：DE4440398
申请日：1994-11-11
申请人： PENTAX CORP
发明人： ITO TAKAYUKI
IPC分类号： G02B13/18 , G02B15/167 , G02B15/20
摘要： A zoom lens system includes at least three lens groups including a positive first lens group, a positive second lens group, and a negative third lens group, in this order from an object side. The first, second and third lens groups are all moved toward the object side during zooming from a wide angle extremity to a telephoto extremity so that a distance between the first and second lens groups increases and a distance between the second and third lens groups decreases. The zoom lens system satisfies the formulae:0.7

6. 发明专利

DE4335283B4 未知
公开(公告)号：DE4335283B4
公开(公告)日：2006-01-05
申请号：DE4335283
申请日：1993-10-15
申请人： PENTAX CORP
发明人： YOONEYAMA SHUJI , ITO TAKAYUKI
IPC分类号： G02B15/163 , G02B15/20
摘要： The improved zoom lens system comprises, in order from the object side, a positive first lens group, a positive second lens group and a negative third lens group, the third lens group having a biaspheric positive lens element on the side the closest to the object that has a convex surface directed towards the image and the third lens group further including at least one negative lens element that has a concave surface directed towards the object, and the system is further characterized in that all lens groups are moved towards the object during a zoom from the wide-angle end to the narrow-angle end, and the following conditions are satisfied: (a) 0

7. 发明专利

DE4244162B4 未知
公开(公告)号：DE4244162B4
公开(公告)日：2005-08-04
申请号：DE4244162
申请日：1992-12-24
申请人： PENTAX CORP
发明人： ITO TAKAYUKI
IPC分类号： G02B15/173 , G02B15/16 , H04N5/225 , G02B15/20
摘要： A zoom lens system having in order from the object side, a first positive lens group, a second negative lens group and a third positive lens group. At least the second lens group and the third lens group are movable along an optical axis for changing magnification. This lens system further satisfies the following conditions: (a) 0

8. 发明专利

DE4224394B4 未知
公开(公告)号：DE4224394B4
公开(公告)日：2005-08-04
申请号：DE4224394
申请日：1992-07-23
申请人： PENTAX CORP , PENTAX PREC CO
发明人： ITO TAKAYUKI , SUGANO YASUYUKI
IPC分类号： G02B15/17
摘要： A zoom lens system includes, in order from the object side, a first lens unit that remains fixed during zooming and which has a positive power, a second lens unit that has a zooming capability, that moves during zooming and that has a negative power, a third lens unit that has a capability of compensating for the position of the focal point, that moves during zooming and that has a negative power, and a fourth lens unit that has an imaging capability, that remains fixed during zooming and that has a positive power, said fourth lens unit comprising a first sub-unit that comprises, in order from the object side, a positive lens element, a positive lens element and a negative lens element and that has a positive overall power, and a second sub-unit that comprises, in order from the object side, a positive lens element, a negative lens element and a positive lens element and that has a positive overall power. The zoom lens system satisfies the specified conditions.

9. 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.

10. 发明专利

DE10142603B4 未知
公开(公告)号：DE10142603B4
公开(公告)日：2007-04-12
申请号：DE10142603
申请日：2001-08-31
申请人： PENTAX CORP
发明人： MURATA MASAYUKI , ITO TAKAYUKI
IPC分类号： G02B13/04 , G02B9/00 , G02B13/06 , G02B13/18 , G02B15/16 , G02B15/177
摘要： A wide-angle lens system includes a negative first lens group, and a positive second lens group, in this order from the object. The second lens group includes a positive 2F sub-lens group and a positive 2R sub-lens, in this order from the object. Upon focusing from infinity to a closer object distance, an Fa lens group constituted by the first lens group and the positive 2F sub-lens group which are arranged to move integrally, and an Fb lens group constituted by the positive 2R sub-lens group are independently moved from the image side toward the object side so that the distance between the Fa lens group and the Fb lens group are made shorter. Furthermore, the a wide-angle lens system satisfies the following conditions:

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