Nippon Kogaku K.k.

Musashi Seimitsu Kogyo Kabushiki Kaisha

Oiles Industries Co., Ltd.

Kenji Yamada

Hideo Mizutani

Kazuo Morohashi

Akira Nemoto

Tsunemi Gonda

Eiji Satoh

Kiyoharu Mitani

Masayuki Kohama

Kunihiko Yokoya

Apparatus for measuring curvature of an object automatically is so composed to guide two radiation beams reflected by the object to a linear image sensor, and determine the curvature of the object from the signals obtained from the linear image sensor, in response to the distance of two radiation beams on the sensor. The apparatus is further provided with an image rotator between means for generating two radiation beams and the object.

Apparatus for measuring curvature

An eye-examining apparatus comprises a first positive lens unit, a negative lens unit, a second positive lens unit, a third positive lens unit and a target mark arranged in the named order from the side of the examined eye. The third positive lens unit is mounted movably along the optical axis. Between the first and second positive lens units there is interposed on astigmatic system rotatable about the optical axis. The negative lens unit, the second positive lens unit and the third positive lens unit are so arranged as to form an image of the mark at a position near the focal point on the target mark side of the first lens unit. The focal point on the examined eye of the composite system composed of the negative lens unit, the second positive lens unit and the third positive lens unit is approximately coincident with the position conjugate with the pupil of the examined eye relative to the first positive lens unit. The diopter of the apparatus is changed by moving the third positive lens unit and the change of the axis and degree of astigmatism are achieved by rotating the astigmatism system.

Apparatus for eye examination

An apparatus which comprises a collimating lens, light source means for selectively forming light sources in two positions on the optical axis of the collimating lens, means for defining the position of the lens to be inspected opposite to the light source with respect to the collimating lens, a mask plate having translucent or opaque areas symmetrical to the optical axis, a relay lens for placing the mask plate at a position conjugate with the lens position, an imaging lens positioned opposite to the mask plate with respect to the relay lens, and photoelectric converting means for producing image signals corresponding to the positions, in a plane perpendicular to the optical axis, of the image of the translucent or opaque areas of the mask plate formed by the imaging lens.

Apparatus for measuring optical characteristics of optical systems

In an apparatus for measuring the optical characteristics of an optical system to be examined a light source determines a reference optical axis and generates a light beam that is passed through the optical system to be examined along the reference optical axis. A mask partly transmits the light beam therethrough and has a pattern comprising at least one straight line disposed off the reference optical axis in the light beam, the straight line of the pattern extending in a predetermined direction in a plane substantially orthogonal to the reference optical axis. A photosensitive detector receives the light beam passed through the optical system to be examined and the mask. The detector is fixedly disposed relative to the mask and has a substantial length in a direction substantially orthogonal to the reference optical axis and the straight line of the pattern. The detector produces an electrical signal indicative of the position of the pattern of the mask projected onto the detector in the direction of the length of the detector. A rotator provides relative rotation about the reference optical axis between the light beam passed through the optical system to be examined and the mask. A signal processor processes the electrical signal and finds the refractive characteristic of the optical system to be examined. -

Apparatus for measuring the optical characteristics of an optical system

A variable magnification observation optical device comprises an objective lens, an eyepiece disposed rearwardly of the objective lens, a magnification changing lens disposed between the objective lens and the eyepiece, a support member for supporting the magnification changing lens so that the principal point thereof can be changed from one to the other of the objective lens side position and the eyepiece side position relative to an object image formed between the objective lens and the eyepiece by the objective lens, the support member having a field stop for at least one of a state in which the principal point of the magnification changing lens is positioned on the objective lens side and a state in which the principal point of the magnification changing lens is positioned on the eyepiece side, and change-over means for moving the support member to change the principal point of the magnification changing lens from said one position to said other position, thereby changing over the magnification of the optical device.

Variable magnification observation optical device

An imaging optical system for photographing an object or an object image at a short distance includes, in succession from the object side, a first positive lens, a second positive lens disposed with a great air space from the first positive lens, a negative lens, and a third positive lens.

Imaging optical system

The ball joint for the suspension system of automobiles, in which as a load-supporting seat, a multi-layer material provided with the synthetic resin layer having self-lubricating ability and abrasion resistance is used on the surface of the back metal, while as an opposite seat to a ball stud, synthetic resin having self-lubricating ability and wear resistance is used, and constituted so as to keep securely load support applied on the ball head by both seats.

Growing community of inventors

Narashino, Japan

Kenji Yamada