Olympus Optical Company, Ltd.

Ken-ichi Nakahashi

Shin-ichi Mihara

Masaki Matsubara

Youich Iba

Toshihiro Imai

Nobuo Yamashita

Masaki Imaizumi

Akio Taira

Youichi Iba

An endoscope provided with a light receiving device on the eyepiece side in respect of an image guide and with a driving means for moving an objective lens near an eyepiece, to make the whole endoscope slim and to make it simple in formation despite its being provided with an automatic focus detecting mechanism.

Automatic focus detecting mechanism for endoscopes

An in-focus detector for a binocular stereomicroscope having a pair of left- and right-hand observation optics includes a pair of beam splitters, each disposed intermediate the objective lens and the eyepieces of the respective observation optics. The first one of the beam splitters introduces the optical image of a mark into one of the observation optics, which then focuses it on an object being observed. The image is then reflected by the object and passes through the other observation optics to be reflected by the second beam splitter so as to be directed externally of the observation optics and focussed on a photoelectric transducer element, which is effective to detect an in-focus condition.

In-focus detector for a binocular stereomicroscope

An optical system for retinal cameras wherein the distance between an eye to be inspected and an inspector is made short to improve the operatability and to make it easy to handle the eye to be inspected.

Optical system for retinal cameras

A compactly designable optical system for ophthalmological instruments comprising an illumination system so adapted as to illuminate a fundus with rays having passed through a ring slit and been focused on the cornea of an eyeball to be examined, and an observation/photographing system so adapted as to permit observing and photographing an image of said eyeball with a small reflector mirror arranged in said illumination system so as to be inclined with regard to the optical axis thereof and a relay lens for focusing the rays which are reflected by the fundus, passing through said objective lens and reflected by said small reflector mirror.

Optical system for ophthalmological instruments

An objective for endoscopes comprising a first, second, third, fourth and fifth lens components in which the first lens component is a negative meniscus lens having a convex surface on the object side, the second lens component is a positive meniscus lens having a concave surface on the object side, the third lens component is a positive lens, the fourth lens component is a cemented lens consisting of a positive lens element and a negative lens element cemented to said positive lens element, and the fifth lens component is a positive lens, the objective for endoscopes having a very wide angle of view and well corrected aberrations.

Objective for endoscopes

An objective optical system for endoscopes comprising an objective and image guide for transmitting an image of an object formed by the objective, the objective comprising a first lens component consisting of a cover glass and plano-covex lens, which are cemented together by arranging a stop between them, and a second lens component which is a plano-convex lens arranged toward the object side, the objective optical system for endoscopes enabling to observe with a wide field angle.

Objective optical system for endoscopes

A focusing method for use in an optical system and a focusing apparatus used therefor employ an illumination unit. The method comprises effecting photometry of light reflected from an object which is to be observed and which is illuminated only by light from the illumination unit, and causing a movement of the optical system to focus it, the magnitude of the movement being determined by the amount of light measured by the photometric operation.

Focusing method and apparatus for use in an optical system

An optical system for endoscopes comprising an objective lens, a plural number of relay lenses for consecutively transferring the image formed with said objective lens and an eyepiece. In said optical system, the whole or portion of one of said relay lenses can be displaced along the optical axis to vary magnification level of said optical system.

Optical system for endoscopes

A plan achromat objective lens system designed for a magnification level on the order of 40.times. for use with microscopes comprising a first negative meniscus lens component, a second positive lens component, a third positive cemented doublet and a fourth positive cemented doublet, said objective lens system being so adapted as to correct various aberrations favorably with the small number of lens components.

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Hachiouji, Japan

Ken-ichi Nakahashi