摘要:
A zoom lens system has a first lens unit and a second lens unit from the object side. The first lens unit has a negative optical power. The second lens unit has a positive optical power. The second lens unit is arranged on the image side of the first lens unit. An air space between the first and second units is variable for zooming. The second lens unit has a doublet lens element composed of a positive lens element and a negative lens element cemented together.
摘要:
A lens holding structure in a lens block forming all or part of an optical system, the lens holding structure capable of attaining a compact lens block of inexpensive and simple construction by using a holding barrel having an outer diameter smaller than an outer diameter of the largest lens element to be included in the lens block. The largest lens element is fixed to another lens element to be included in the lens block or the holding barrel by a face thereof having a predetermined angle with respect to an optical axis of the lens block.
摘要:
A zoom lens system is provided with, from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power. Zooming from a shortest focal length condition to a longest focal length condition is performed by moving all of the lens units while reducing the distance between the first and second lens units and the distance between the second and third lens units. The second lens unit includes three lens elements of a positive lens element, a negative lens element and a positive lens element from the object side.
摘要:
A compact zoom lens system comprises a front negative lens component and a rear positive lens component with a variable air space between the front and the rear lens components. The front negative lens component consists of two lens elements and the rear lens component consists of two or three lens elements. A plurality of aspherical surfaces are employed for the compact zoom lens system. Furthermore, some zoom lens system includes an additional negative lens component having a weak refractive power behind the rear lens component.
摘要:
A compact zoom lens system comprises from the object side: a first lens component of a positive refractive power; a second lens component of a negative refractive power with a variable air space between the first and second lens components; and a third lens component of a positive refractive power with a variable air space between the second and third lens components. A plurality of aspherical surfaces are employed for the realization of a compact and low-cost zoom lens system. Furthermore, a focusing operation is carried out by both of the first and second lens components or third lens component.
摘要:
A variable magnification optical system of the present invention for forming an optical image of an object on a light-receiving surface of an image sensor with variable magnification includes: from the object side, at least a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fourth lens unit having a positive optical power. The variable magnification is performed by movement of at least the first lens unit and the third lens unit. A bending optical element for bending an optical axis is provided between the second lens unit and the third lens unit. Moreover, prescribed conditional formulae are fulfilled.
摘要:
An object of the present invention is to provide a compact size variable power optical system capable of producing a high quality image. The variable power optical system comprises a plurality of lens groups for forming an optical image on an image surface of an image pickup device. Among the plurality of lens groups, the first lens group, which is disposed in the most subject side has a negative refraction power, includes at least a lens having a negative refraction power and a reflective optical element for bending the optical axis. When varying the variable power, the axial distance between the first lens group and the image surface varies. When Nd denotes the refraction power of the lens having negative refraction power at d-line, the refraction power satisfies the conditional formula Nd>1.81.
摘要:
An image taking optical system including a main optical system for forming an object image; and an image splitting unit for dividing an image without re-forming the image formed by the main optical system. The image splitting unit includes sequentially from the object side a performance correcting optical system and an image splitting unit, and satisfies the following conditional equation: −0.25
摘要:
An optical system includes a first optical element formed of a noncrystalline polyester resin having a copolymer ratio of 9,9-bis [4(2-hydroxyethoxy) phenyl]fluorene in a range of 35 molar percent to 45 molar percent when the dicarboxylic acid component is 100 molar percent, and a second optical element formed of material incorporating an ultraviolet light absorption agent and disposed at least either anteriorly or posteriorly to the first optical element.
摘要:
A zoom lens system of the present invention comprises, from the object side, a first positive lens unit, a second negative lens unit, a third positive lens unit, a fourth positive lens unit and a fifth negative lens unit, wherein all of the lens units move toward the object during zooming from the shortest focal length condition toward the longest focal length condition, and said zoom lens system meets the following conditions.-0.30