Electronic picture taking apparatus having a zoom lens system
First Claim
1. An electronic picture taking apparatus comprising a zoom lens system and an electronic image pickup device;
- said zoom lens system comprising at least four lens units, a foremost first lens unit on an object side of said zoom lens system having a negative refractive power, each of foremost three consecutive lens units having variable space on an image side thereof between an adjacent lens unit for performing a zooming operation, a rearmost lens unit of said zoom lens system consisting of a single positive lens element having an aspherical surface and being fixed during the zooming operation;
said zoom lens system including a movable aperture stop incorporated with a second lens unit disposed adjacent to said first lens unit; and
said electronic picture taking apparatus satisfying the condition1.5<
L2 /Y<
3.5wherein L2 is an amount of movement of said second lens unit in the direction of an optical axis thereof while performing the zooming operation from a wide angle end to a telephoto end, and Y is a length of a diagonal line of an effective image receiving area of said image pickup device.
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Accused Products
Abstract
An electronic picture taking apparatus comprises a zoom lens system and an image pickup device. The zoom lens system has a type of movement suitable for stable, high performance in the range from infinite to near distance and being thoroughly reduced the thickness. The zoom lens system comprises at least four lens units. A foremost first lens unit on the object side of said zoom lens system has a negative refractive power. Each of three consecutive lens units has variable space on the image side thereof between an adjacent lens unit for performing a zooming operation. A rearmost lens unit of the zoom lens system consists of a single positive lens element having an aspherical surface and being fixed during the zooming operation. The zoom lens system includes an aperture stop moving incorporated with the second lens unit which is adjacent to the first lens unit. The electronic picture taking apparatus satisfies the following condition:
1.5<L2/Y<3.5 (1)
wherein L2 is an amount of movement of the second lens unit in the direction of optical axis thereof while performing the zooming operation from a wide angle end to a telephoto end, and Y is a length of a diagonal line of an effective image receiving area of the image pickup device.
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Citations
70 Claims
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1. An electronic picture taking apparatus comprising a zoom lens system and an electronic image pickup device;
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said zoom lens system comprising at least four lens units, a foremost first lens unit on an object side of said zoom lens system having a negative refractive power, each of foremost three consecutive lens units having variable space on an image side thereof between an adjacent lens unit for performing a zooming operation, a rearmost lens unit of said zoom lens system consisting of a single positive lens element having an aspherical surface and being fixed during the zooming operation;
said zoom lens system including a movable aperture stop incorporated with a second lens unit disposed adjacent to said first lens unit; and
said electronic picture taking apparatus satisfying the condition 1.5<
L2 /Y<
3.5wherein L2 is an amount of movement of said second lens unit in the direction of an optical axis thereof while performing the zooming operation from a wide angle end to a telephoto end, and Y is a length of a diagonal line of an effective image receiving area of said image pickup device. - View Dependent Claims (5, 9, 13, 17, 37, 41, 45, 53)
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2. An electronic picture taking apparatus comprising a zoom lens system and an electronic image pickup device;
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said zoom lens system comprising a first negative lens unit, a second positive lens unit, a third positive lens unit, and a fourth positive lens unit in order from an object side;
a space between said second lens unit and third lens unit increasing during a zooming operation from a wide angle end to a telephoto end while focused on an infinite object;
focusing on the object nearer the zoom lens system being performed by moving said third lens unit toward the object side;
said fourth lens unit consisting of a single positive lens element having an aspherical surface; and
said zoom lens system satisfying the condition −
1.2<
exPW/exPT<
0wherein exPW and exPT designate a distance from an image plane to an exit pupil of said zoom lens system at the wide angle end and the telephoto end, respectively when said zoom lens system is focused on an infinite object. - View Dependent Claims (6, 10, 14, 18, 38, 42, 46, 54)
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3. An electronic picture taking apparatus comprising a zoom lens system and an electronic image pickup device;
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said zoom lens system comprising a first negative lens unit, a second positive lens unit, a third positive lens unit, and a fourth positive lens unit in the order from an object side;
a space between said second lens unit and said third lens unit increasing during a zooming operation from a wide angle end to a telephoto end while focused on an infinite object;
focusing on the object nearer the zoom lens system being performed by moving said third lens unit toward the object side;
said second lens unit consisting of, in order from the object side, a single lens element having an aspherical surface and a cemented lens component composed of a positive lens element and a negative lens element in this order from the object side;
said third lens unit consisting of a single positive lens element; and
said zoom lens system satisfying the condition −
1.5<
(R2C1+R2C2)(R2C2−
R2C3)/(R2C1−
R2C2)(R2C2+R2C3)<
−
0.3and 0.05<
t2N/t2<
0.3wherein R2C1, R2C2 and R2C3 are radii of curvature measured on an optical axis of said zoom lens system of a first surface, a second surface and a third surface of said cemented lens component in this order from the object side, respectively, t2N is a thickness of said negative lens element of said cemented lens component on the optical axis, and t2 is an entire thickness of said second lens unit on the optical axis. - View Dependent Claims (7, 11, 15, 19, 21, 22, 23, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 39, 43, 47, 55, 58, 59, 60, 65, 66)
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4. An electronic picture taking apparatus comprising a zoom lens system and an electronic image pickup device;
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said zoom lens system comprising a first negative lens unit, a second positive lens unit, a third positive lens unit, and a fourth positive lens unit in order from an object side;
a space between said second lens unit and third lens unit increasing during a zooming operation from a wide angle end to a telephoto end while focused on an infinite object, focusing on the object nearer the zoom lens system being performed by moving said third lens unit toward the object side, said second lens unit consisting of, in order from an object side, a lens component having an aspherical surface and a negative lens component, said third lens unit consisting of a single positive lens element, and said zoom lens system satisfying the condition 0.03<
t2NI/t2<
0.3wherein t2NI is a thickness along an optical axis of a negative lens element placed at a rearmost position in said second lens unit and t2 is an entire thickness of said second lens unit on the optical axis. - View Dependent Claims (8, 12, 16, 20, 24, 40, 44, 48, 49, 50, 51, 52, 56)
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57. An electronic picture taking apparatus comprising a picture taking optical system and an electronic image pickup device,
said picture taking optical system including a plurality of lens units, the last lens unit disposed rearmost on an image side of said picture taking optical system being a lens component having an aspherical surface and that is kept fixed during a focusing operation, and a lens unit that is movable during the focusing operation disposed just before said last lens unit.
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61. An electronic picture taking apparatus comprising a picture taking optical system and an image pickup device;
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said picture taking optical system comprising a first negative lens unit disposed foremost on an object side of said picture taking optical system and at least three lens units disposed on an image side of said first lens unit, each of three consecutive lens units from said first lens unit having a variable space on the image side thereof between adjacent lens units for performing a zooming operation, a rearmost lens unit of said picture taking optical system consisting of a single lens component having an aspherical surface and being fixed during both zooming and focusing, said picture taking optical system including an aperture stop moving incorporated with said second lens unit during zooming operation which is adjacent to said first lens unit. - View Dependent Claims (67)
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62. An electronic picture taking apparatus comprising a zoom lens system and an image pickup device;
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said zoom lens system consisting of, in order from an object side, a first negative lens unit, a second positive lens unit, a third positive lens unit, and a fourth positive lens unit, focusing on the object nearer the zoom lens system being performed by moving said third lens unit toward the object side, said fourth lens unit consisting of a single lens element having an aspherical surface and kept fixed during a zooming operation. - View Dependent Claims (68)
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63. An electronic picture taking apparatus comprising a zoom lens system and an image pickup device;
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said zoom lens system consisting of, in order from an object side, a first negative lens unit, a second positive lens unit, a third positive lens unit, and a fourth positive lens unit, focusing on the object nearer the zoom lens system being performed by moving said third lens unit toward the object side, said second lens unit consisting of a single lens element having an aspherical surface and a cemented lens component composed of, in order from the object side, a positive lens element and a negative lens element, said third lens unit consisting of a single positive lens element. - View Dependent Claims (69)
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64. An electronic picture taking apparatus comprising a zoom lens system and an image pickup device;
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said zoom lens system consisting of, in order from an 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 positive refractive power and a fourth lens unit having a positive refractive power, said second lens unit consisting of a positive lens component having an aspherical surface and a negative lens component, said third lens unit consisting of a positive lens element, wherein said third lens unit moves toward the object side when focusing in close range of the zoom lens system. - View Dependent Claims (70)
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Specification