摘要:
An optical system focuses an object upon an image surface of a solid-state image device. The optical system has a master optical system and a condenser lens. The master optical system and the condenser lens both have positive optical power. The focusing optical system fulfills the following conditions: ##EQU1## where a represents the distance between the exit pupil of the master optical system and the image surface;b represents the distance between the exit pupil of the entire optical system and the image surface; andY' represents the maximum image height.
摘要:
A zoom lens system is provided with, from the object side, a first lens unit having a negative optical power, a second lens unit having a positive optical power, a third lens unit having a negative optical power, and a condenser lens unit having a positive optical power. In this zoom lens system, zooming is performed by varying the distances between the first, the second, the third lens unit, and the condenser lens unit. Additionally, this zoom lens system fulfills the condition below:-1.5
摘要:
A zoom lens system has four or five lens units with the optical powers being +/-/+/- or +/-/+/+/-, respectively, from the object side. The image side lens unit has a negative optical power and is movable, along with at least one other lens unit, in a zooming operation. The zoom lens system satisfies the following conditions: 0.6
摘要:
A zoom lens system for use in a compact lens shutter camera has excellent optical properties at a high zoom ratio of 4-5 across the entire zoom range with a small number of lenses. The zoom lens system has, from the object side to the image side, a positive first lens unit, a negative second lens unit, a positive third lens unit and a negative fourth lens unit, wherein the air spaces between each lens unit vary during a zooming operation. The zoom lens system fulfills predetermined conditions related to the back focal distance, the shifting amount of the second and third lens units during zooming and the thickness of the third lens unit.
摘要:
A taking lens apparatus includes a zoom lens system that is composed of a plurality of lens units and that achieves zooming by varying the distances between the lens units and an image sensor that converts the optical image formed by the zoom lens system into an electrical signal. The zoom lens system has, from the object side,: a first lens unit having a negative optical power, a second lens unit disposed on the image side of the first lens unit and having a negative optical power, a third lens unit disposed on the image side of the second lens unit and having a positive optical power, a fourth lens unit disposed on the image side of the third lens unit and having a positive optical power, and a fifth lens unit disposed on the image side of the fourth lens unit and having a positive optical power. During zooming, the first lens unit remains stationary relative to the image sensor, and the second and third lens units move.
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 positive refractive power, and a third lens component of a negative refractive power. The first lens component has at least one aspherical surface. There are variable air spaces between the first and second lens components and between the second and third lens components.
摘要:
A zoom lens system has, from the object side, a first lens unit having a optical power, a second lens unit having a negative optical power a third lens unit having a positive optical power, and a succeeding lens unit. The first and the third lens units monotonically move toward the object side during zooming from the shortest focal length condition to the longest focal length condition. A number of predetermined conditions are disclosed which can be satisfied to ensure a high quality, compact zoom lens for a digital camera.
摘要:
The object of the present invention is to provide a taking lens system that has an exit pupil located at or close to infinity and has a short total length. In order to achieve said object, the present invention comprises, from the object side, a main optical system comprising a first lens unit having a negative refractive power and a second lens unit having a positive refractive power, and a condenser lens that is located between said main optical system and the image plane and has a positive refractive power.
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 zoom lens system has at least three lens units of, from the most object side, a first lens unit having a negative optical power, a second lens unit having a positive optical power and a third lens unit, wherein the distances between the lens units are varied by moving all of the lens units during zooming. The zoom lens system satisfies the predetermined mathematical condition.