摘要:
A vari-focal photographic lens system of rear lens group exchange type comprising a front lens group and a rear lens group and arranged to vary the focal length of the lens system as a whole by exchanging the rear lens group for another rear lens group having a different lens configuration, the vari-focal photographic lens system being arranged so compactly and arranged that the variation of aberrations is small.
摘要:
A varifocal lens system equipped with an auxiliary lens group comprising a master lens system consisting of a front lens group having positive refractive power and a rear lens group having negative refractive power, and an auxiliary lens group arranged in such a manner that it can be freely inserted and removed, for varying focal length, between said front and rear lens groups. Said varifocal lens system is equipped with a simple mechanism capable of varying focal length of said lens system in a very short time.
摘要:
A compact vari-focal photographic lens system comprising a master lens system and an auxiliary lens group wherein the master lens system comprises a front lens unit having positive refractive power and a rear lens unit having negative refractive power, the compact vari-focal photographic lens system being arranged to vary the focal length of the lens system as a whole by inserting and removing the auxiliary lens group to and from the image side of the master lens system and arranged that the overall length of the lens system is short, it is possible to vary the focal length without moving the stop mechanism, and aberrations are corrected satisfactorily favorably, the compact vari-focal photographic lens system being suitable for the use with popular cameras.
摘要:
A vari-focal photographic lens system of lens group exchange type comprising, in the order from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a third lens unit having negative refractive power, the vari-focal photographic lens system being arranged to vary the focal length thereof by exchanging the second lens unit for another second lens unit having different lens configuration.
摘要:
A finder optical system including an objective system, an image erecting system for erecting an object image formed by the objective system, and an eyepiece system for observing the object image. These systems are constructed of low-hygroscopic organic materials. Thus, the finder optical system can prevent transient variations of optical properties caused by hygroscopicity.
摘要:
A Gauss type lens system comprising a first, second, third and fourth lens components, the first lens component being a positive meniscus lens, the second lens component being a cemented doublet consisting of a positive lens and negative lens, the third lens component being a cemented doublet consisting of a negative lens and positive lens, the fourth lens component being a biconvex lens, the Gauss type lens system having the aperture ratio of 1.8 and field angle of 46.degree. and being made low in price by using high refractive-index high dispersion glass materials for many of lenses.
摘要:
A take-up equipment and a take-up method for a finish rolling mill for dividing a strip into a plurality of coiled products when taking up the strip on the exit side of the finish rolling mill are provided. A plurality of take-up machines (24, 26, K1, K2) are disposed at the downstream side of a hot finish rolling mill; a shearing machine (27, 2) is provided on the upstream side of a pinch roll (23, 4) of the take-up machines (24, K1) at the uppermost stream end; and a strip passing device (28, 6a) is provided between the shearing machine and the pinch roll at the uppermost stream to prevent a strip from rising. The strip passing devices are guiding devices for restricting the height of the rise of the strip or the airflow suction type strip passing devices for drawing in a strip under suction using airflow. The plurality of take-up machines are down coilers or carousel type reels having two winding drums (66a, 66b).
摘要:
A real image mode variable magnification finder optical system comprising an objective lens system including a rotatable prism, an image erecting optical system for erecting an image formed by the objective lens system and an eyepiece lens system having a positive refractive power. The prism is rotated 180.degree. for changing the finder optical system between a wide angle condition and a telephoto condition. This variable magnification finder optical system permits minimizing a space required for operating an optical member for changing a magnification thereof and composing the objective lens system compactly of a small number of component parts.
摘要:
A switching variable magnification finder includes an objective lens system having a positive refracting power, an image erecting optical system for erecting an image formed by the objective lens system, and an eyepiece system having a positive refracting power, in which an auxiliary lens system is removably disposed behind the objective lens system so that magnification is varied according to the insertion or removal of the auxiliary lens system. Thus, the switching variable magnification finder allows magnification to be changed without increasing the overall of the finder optical system and moving the objective lens system and its switching mechanism to be simplified.
摘要:
There is an indicating device constituted so as to be apt to indicate the data such as the magnification ratio of an objective lens, the value of NA, the data or the like in the visual field of a microscope and at the same time to record these data in photograph. This indicating device is provided with a display means (17) able to indicate various sorts of data informations through the data processor (16) and polarizing prisms (10, 11) arranged between the objective lens (9), display means (17), photographing lens (14) and eyepiece (13) to divide the light bundle from the objective lens (9) and the light bundle from the data display means (17) respectively and to make them advance to the eyepiece (13) and photographing lens (14), and the data informations displayed on the display means (17) are imaged on the image forming face (12) inside the eyepiece (13) and on the dry-plate (15). This indicating device may use, instead of the above mentioned polarizing prism, the optical fiber bundle (19) arranged between the data display means (17) and eyepiece barrel (22) to image the data information displayed on the display means (17) on the image forming face (12) inside the eyepiece (13).