摘要:
A non-flexible endoscope comprises a slender insert section which is capable of being inserted from a leading end thereof into cavities of living bodies, an objective lens system for forming a primary image within the insert section, and a relay lens system for transmitting said primary image so as to form a secondary image, wherein the insert section satisfies the following condition:0.3
摘要:
An endoscope comprising, in order from the object side, an objective optical system and image relaying optical systems disposed in a number of n, and using, in a (n-1)th or nth image relaying optical system, an optical system for producing positive distortion so as to cancel negative distortion produced by the objective optical system, thereby correcting distortion favorably in the endoscope as a whole.
摘要:
A relay lens system for an endoscope is provided and includes three axially aligned cylindrical lens pairs, each lens pair having two substantially rod-like lenses. Each rod-like lens includes a convexo-concave polymeric aspheric lens and a concavo-convex polymeric aspheric lens which are symmetrically placed and affixed about a glass rod with flat ends by means of plano-convex optical cement lens elements. The optical cement lens elements form lens-like elements which contribute to both the color and geometric aberration correction of the lens system. When inserted as a component of an endoscope or laparoscope, the distal end of the relay lens system is axially aligned with an objective lens and the proximal end is axially aligned with a viewing eyepiece. The image formed at the distal end of the endoscope by the objective lens is transmitted by the relay lens system, which inverts once and refocuses twice before forming a final upright image in front of the eyepiece for viewing or recording.
摘要:
Radial gradient index of refraction (GRIN) optical relays are described for overcorrecting axial chromatic aberration. In particular, a relay including a negative dispersion radial GRIN rod alone or in combination with simple homogeneous or GRIN lenses is described for adjusting axial chromatic and monochromatic aberrations, including spherical, coma, astigmatism, and distortion. The invention also describes remote viewing scopes, such as endoscopes and borescopes, which utilize GRIN relays for achromatic, and reduced or corrected monochromatic aberration imaging The use of segmented GRIN relays provides a degree of flexibility in remote viewing scopes.
摘要:
An optical system for an endoscope has, in order from its object side, an objective lens system having a first lens unit with a negative refractive power, a second lens unit with a positive refractive power and an aspherical surface therein, and relay lens systems arranged on the image side of the objective lens system. The optical system for an endoscope can correct aberrations, assure uniform brightness over the entire range of an image from its center to its peripheral areas, and permits reducing the diameter of the cover glass plate used therein.
摘要:
An image transmission optical system wherein a lens unit serving for relaying an image for a unit relaying distance consists of two bar shaped cemented lens components, and each of said lens components consists of a bar-shaped lens element and two lens elements which are cemented to both the end surfaces of the bar-shaped lens element respectively of said bar-shaped lens element and have a refractive index higher than that of the bar-shaped lens element. This image transmission optical system comprises a small number of air-contact surfaces and has favorably corrected aberrations.
摘要:
An endoscope is provided with an objective lens system, an ocular lens and an intermediate relay lens system. The relay lens system is a hybrid system using both plastic and glass elements. The plastic elements comprise an even plurality (N) of axially aligned lenses each having a length of the same order as its diameter. Intermediate said plastic lenses are a plurality (N minus 1) of axially aligned glass plano cylinder, the end faces of which are polished.
摘要:
An objective for an endoscope comprising a GRIN lens whose surface on the object side is arranged as a planar surface or convex surface and whose surface on the image side is arranged as a convex surface, the objective for an endoscope having an extremely small outer diameter and a wide field angle.
摘要:
An image transmission optical system for an endoscope comprising a first lens component which comprises a positive lens, a second lens component which comprises two meniscus lenses arranged that the concave surfaces thereof face each other, a third lens component having positive refractive power, a fourth lens component which comprises two meniscus lenses arranged that the concave surfaces thereof face each other, and a fifth lens component which comprises a positive lens, the image transmission optical system being arranged to be symmetrical in respect to the center of the third lens component and arranged that curvature of field is corrected favorably.
摘要:
A rod lens assembly for endoscopes and the like which includes an inner tube or barrel disposed in spaced or floating relation within a protective outer tube, the outer tube preferably including an inner layer of light-transmitting fibers and the inner tube containing a plurality of axially-spaced image-transmitting rod lenses. The wall portions of the barrel extending between the ends of adjacent lenses are provided with openings to allow precise positioning of the lenses during assembly and to provide zones of preferential flexure of the barrel when the entire assembly is flexed in normal use. In one embodiment, the cylindrical lenses are fixed in place by clamping forces exerted by the normally non-cylindrical walls of the barrel. The method for making such an assembly, including the steps of inserting, adjusting, securing, and cleaning the lenses, is also disclosed.