Abstract: The invention relates to a zoom lens that enables an optical path to be easily bent by a reflecting optical element, has a wide-angle design and high optical performance as represented by a high zoom ratio of about 3.4, is extremely slimmed down in the depth direction, and costs less. The zoom lens comprises a positive first lens group G1, a negative second lens group G2, a positive third lens group G3, a positive fourth lens group G4 and a negative fifth lens group G5. Upon zooming from the wide-angle end to the telephoto end, the first lens group G1 remains substantially fixed with respect to an image plane I, and at least the second G2 and the fourth lens group G4 move. The first lens group G1 includes a reflecting optical element for bending the optical path involved, and a portion of the first lens group G1 on an object side with respect to the reflecting surface has negative refracting power. The zoom lens satisfies condition (1) with respect to the focal length of the fifth lens group G5.

Abstract: An image pickup apparatus having an optical path reflecting zoom lens system includes a zoom lens system, and an image pickup element which is disposed at an image side of the zoom lens system. The zoom lens system includes in order from an object side thereof a first lens unit G1 having a positive refracting power, which includes a reflecting optical member having a reflecting surface which reflects an optical path, a second lens unit G2 having a negative refracting power, a third lens unit G3 having a positive refracting power, a fourth lens unit G4 having a positive refracting power, and an aperture stop S which is disposed between the second lens unit G2 and the fourth lens unit G4. The first lens unit G1 has a position fixed with respect to a position of the image pickup element. At least the second lens unit G2 and the fourth lens unit G4 move and the zooming is carried out from a wide angle end to a telephoto end by changing a distance between each of lens units.

Abstract: A zoom lens system comprises, in order from an object side, a positive first lens unit including a reflective optical element, a negative second lens unit, a positive third lens unit and a positive fourth lens unit, or a positive first lens unit, a negative second lens unit, a positive third lens unit, a negative fourth lens unit and a positive fifth lens unit. During zooming from a wide-angle end toward a telephoto end, the first lens unit is fixed, at least the second and third lens units move, and a space between the lens units changes. The second lens unit is positioned closer to an image-surface side in the telephoto end than in the wide-angle end, and the third lens unit is positioned closer to the object side in the telephoto end than in the wide-angle end. An image taking apparatus including the zoom lens system is also disclosed.

Abstract: There is disclosed a zoom lens system including, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power and a fourth lens unit having a positive refractive power, and further including an aperture stop S disposed between the second lens unit and the third lens unit, during zooming from a wide-angle end to a telephoto end, a space between the lens units is changed, the first lens unit includes a single lens having a negative refractive power, a reflective optical element having a reflective surface which reflects an optical path and a sub unit having a positive refractive power, and the zoom lens system satisfies predetermined conditions.

Abstract: An electronic imaging apparatus includes a zoom optical system having, in order from the object side, a first lens unit with positive power, a second lens unit with negative power, and an aperture stop, in which the first lens unit is composed of a single positive power unit and the second lens unit has a single negative lens element located at the most object-side position, both surfaces of which are concave, and a positive lens component located at the most image-side position; an electronic image sensor located on the image side of the zoom optical system; and an image processing section electrically processing image data obtained by the electronic image sensor to change the form thereof.

Abstract: The present invention relates to a low-cost zoom lens which has high optical performance specifications such as a wide angle of view and a high zoom ratio of as high as 5, is extremely small in depth and ensures that the optical path of the optical system can easily be bent by a reflecting optical element. A zoom lens includes a first lens group G1 with a positive power, a second lens group G2 with a negative power, a third lens group G3 with a positive power, a fourth lens group G4 with a positive power, a fifth lens group G5 with a negative power, and a sixth lens group G6 with a positive power, wherein upon zooming from a wide-angle end to telephoto end, the first lens group G1 remains fixed relative to an image surface I and at least second and fourth lens groups G2 and G4 move, the first lens group G1 includes, in order from the object side, a negative lens, a reflecting optical element P for bending an optical path, and a positive lens, and conditional expression (1) is satisfied.

Abstract: A zoom lens system comprises, in order from an object side, a positive first lens unit including a reflective optical element, a negative second lens unit, a positive third lens unit and a positive fourth lens unit, or a positive first lens unit, a negative second lens unit, a positive third lens unit, a negative fourth lens unit and a positive fifth lens unit. During zooming from a wide-angle end toward a telephoto end, the first lens unit is fixed, at least the second and third lens units move, and a space between the lens units changes. The second lens unit is positioned closer to an image-surface side in the telephoto end than in the wide-angle end, and the third lens unit is positioned closer to the object side in the telephoto end than in the wide-angle end. An image taking apparatus including the zoom lens system is also disclosed.

Abstract: An electronic image pickup apparatus comprising a zoom lens system and an image pickup device disposed on an image side of the zoom lens system and which converts an image formed by the zoom lens system into an electric signal, the zoom lens system having, in order from an object side, a negative first lens unit, a positive second lens unit, a negative third lens unit, and a positive fourth lens unit, the first lens unit having, in order from the object side, a negative lens and a reflective optical element which reflects an optical path, and during zooming from a wide-angle end to a telephoto end, each space between the lens units which are adjacent with each other being changed, the first lens unit being arranged in a fixed position to the image pickup device, and at least the second lens unit and the third lens unit being moved.

Abstract: There is disclosed an electronic image pickup apparatus including an aperture stop disposed on an optical path reflected by a reflective surface of a first lens unit and having a non-circular aperture in a state in which an area of an aperture of the aperture stop is maximized, and a lens arranged closest to an image side on an optical path extending from the reflective surface to an image surface and having a non-circular shape, each of the shape of the non-circular aperture of the aperture stop and the outer shape of the lens is formed such that a length of the aperture which in a direction along an incident optical axis which enters the first lens unit is smaller than that of which in a direction vertical to the incident optical axis which enters the first lens unit and a reflected optical axis reflected by the reflective surface.

Abstract: There is disclosed a zoom lens system including, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power and a fourth lens unit having a positive refractive power, and further including an aperture stop S disposed between the second lens unit and the third lens unit, during zooming from a wide-angle end to a telephoto end, a space between the lens units is changed, the first lens unit includes a single lens having a negative refractive power, a reflective optical element having a reflective surface which reflects an optical path and a sub unit having a positive refractive power, and the zoom lens system satisfies predetermined conditions.

Abstract: An electronic imaging apparatus includes a zoom optical system having, in order from the object side, a first lens unit with negative power and a second lens unit with positive power, in which lens components having refracting power in the first lens unit are only a single biconcave negative lens element located at the most object-side position and a positive lens component located at the most image-side position; an electronic image sensor placed on the image side of the zoom optical system; and an image processing section electrically processing image data obtained by the electronic image sensor to change the shape thereof. The zoom lens system satisfies the following conditions in focusing of a nearly infinite object point: 0.85<|y07/(fw·tan ?07w)|<0.97 0.75<|y10/(fw·tan ?10w)|<0.

Abstract: A zoom lens system comprises, in order from an object side, a positive first lens unit including a reflective optical element, a negative second lens unit, a positive third lens unit and a positive fourth lens unit, or a positive first lens unit, a negative second lens unit, a positive third lens unit, a negative fourth lens unit and a positive fifth lens unit. During zooming from a wide-angle end toward a telephoto end, the first lens unit is fixed, at least the second and third lens units move, and a space between the lens units changes. The second lens unit is positioned closer to an image-surface side in the telephoto end than in the wide-angle end, and the third lens unit is positioned closer to the object side in the telephoto end than in the wide-angle end. An image taking apparatus including the zoom lens system is also disclosed.

Abstract: An electronic imaging apparatus includes a zoom optical system having, in order from the object side, a first lens unit with negative power and a second lens unit with positive power, in which lens components having refracting power in the first lens unit are only a single biconcave negative lens element located at the most object-side position and a positive lens component located at the most image-side position; an electronic image sensor placed on the image side of the zoom optical system; and an image processing section electrically processing image data obtained by the electronic image sensor to change the shape thereof. The zoom lens system satisfies the following conditions in focusing of a nearly infinite object point: 0.85<|y07/(fw·tan ?07w)|<0.97 0.75<|y10/(fw·tan ?10w)|<0.

Abstract: A zoom lens in which when the magnification is changed in the range from a wide-angle position to a telephoto position in infinite object point focusing, spacing between a first lens unit, with negative refractive power as a whole, having a negative lens and a positive lens, and a second lens unit, with positive refractive power as whole, having a positive lens and a cemented lens component constructed with a positive lens and a negative lens, is narrowed and spacing between the second lens unit and a third lens unit, a single positive lens component, is widened, and the zoom lens satisfies the following condition: 2.1<|?2T|<2.8 where ?2T is the magnification of the whole of the second lens unit at the telephoto position in the infinite object point focusing.

Abstract: An electronic imaging apparatus includes a zoom optical system having, in order from the object side, a first lens unit with positive power, a second lens unit with negative power, and an aperture stop, in which the first lens unit is composed of a single positive power unit and the second lens unit has a single negative lens element located at the most object-side position, both surfaces of which are concave, and a positive lens component located at the most image-side position; an electronic image sensor located on the image side of the zoom optical system; and an image processing section electrically processing image data obtained by the electronic image sensor to change the form thereof.

Abstract: A zoom lens includes, in order from the object side toward the image side, a first lens unit with negative refracting power as a whole, having a negative lens and a positive lens; a second lens unit with positive refracting power as a whole, having a positive lens and a cemented lens component constructed with a positive lens and a negative lens; and a third lens unit having a single positive lens component. The image-side surface of the negative lens of the first lens unit is configured as a concave surface so that the absolute value of power of the concave surface is larger than that of power of the object-side surface of the negative lens. The first lens unit has at least one aspherical surface, and the second lens unit is constructed so that at least two surfaces, excluding a cemented surface between the positive lens and the negative lens constituting the cemented lens component, are aspherical.

Abstract: An observation optical system of the present invention comprises an image erect optical system and an eyepiece optical system for observing an object image. The eyepiece optical system comprises a positive single lens having double convex surfaces and a negative meniscus lens having a concave surface directed toward eye point side, and the following condition is satisfied: 0<S<0.3 0.05<d1/f<0.15 where S=(r1?r2)/(r1+r2), r1 is a curvature radius of the object image side surface of the negative meniscus lens, r2 is a curvature radius of the eye point side surface of the negative meniscus lens, d1 is a distance of air space between the positive single lens and the negative meniscus lens, which represents a distance of air space when diopter of the observation optical system is adjusted to be ?0.8 (m?1) if the air space is changed, and f is a focal length of the eyepiece optical system.

Abstract: The invention relates to an image-formation lens system well balanced among cost reductions, size reductions and performance improvements and an imaging system incorporating that lens system. The image-formation lens system in the imaging system is a zoom lens system that comprises at least three lens groups including a first lens group G1 of positive power, a second lens group G2 of positive power and a third lens group G3 of negative power, wherein zooming is carried out by varying the spacing between adjacent lens groups. The zoom lens system comprises a total of up to 8 lenses, and satisfies the following conditions: 0.07<?g/IH<0.23 ??(1) 1.

Abstract: The invention relates to an image-formation lens system well balanced among cost reductions, size reductions and performance improvements and an imaging system incorporating that lens system. The image-formation lens system in the imaging system is a zoom lens system that comprises at least three lens groups including a first lens group G1 of positive power, a second lens group G2 of positive power and a third lens group G3 of negative power, wherein zooming is carried out by varying the spacing between adjacent lens groups. The zoom lens system comprises a total of up to 8 lenses, and satisfies the following conditions: 0.07<?g/IH<0.23??(1) 1.

Abstract: The invention relates to an image-formation lens system well balanced among cost reductions, size reductions and performance improvements and an imaging system incorporating that lens system. The image-formation lens system in the imaging system is a zoom lens system that comprises at least three lens groups including a first lens group G1 of positive power, a second lens group G2 of positive power and a third lens group G3 of negative power, wherein zooming is carried out by varying the spacing between adjacent lens groups. The zoom lens system comprises a total of up to 8 lenses, and satisfies the following conditions: 0.07<?g/IH<0.23??(1) 1.