Abstract: A reproducing objective for video disks comprising a first, second, third and fourth lenses, the first lens being a plano-convex lens, the second lens being a plano-concave lens, the third lens being a positive lens, the fourth lens being a positive meniscus lens, the reproducing objective for video disks having high resolving power and long working distance.

Abstract: A visual acuity device measures the visual acuity of a patient's eye by directing a pulsating beam of light on the eye and detecting the resulting reflection. A primary pattern having a pattern formed by transparent and non-transparent portions is positioned in the optical path of the pulsating beam of light. A fixed pair of analyzer or secondary pattern is positioned in the optical path of the beam of light reflected from the patient'eye. One of these analyzer or secondary patterns has a pattern which substantially corresponds to the pattern of the primary fixation pattern and the other has a pattern which is the negative mirror image of the pattern of the first analyzer or secondary pattern. The beam of light reflected from the patient's eye is divided by a beam splitter so that each of the analyzer patterns receives the reflected image of the primary pattern from the patient's eye.

Abstract: An improved high speed fish eye lens system is provided capable of compensating for lateral chromatic aberration, field curvature and astigmatism while providing an aperture ratio of F/2.8. The fish eye lens system includes a first lens group of a negative refractive power having two negative meniscus single lenses convex to the object side. A second lens group of a positive refractive power includes a doublet, while a third lens group of a positive refractive power includes at least a positive meniscus single lens convex to the image side and a doublet.

Abstract: A retinal response recorder that is fully automatic, comprises a light stimulator, with means for a patient to position his head, such that his eye is on the horizontal axis of the stimulator. Means are provided for selecting any one of the selected number of light beams directed from the stimulator to the eye of the patient at selected angular positions above and below the horizontal and left to right of the vertical plane through the axis of the stimulator. Appropriate electrodes are positioned on the skin surface of the patient to record electro-muscular potentials generated by the retina of the eye. Means are provided for a prearranged program of selection of stimulator spots. If the eye sees the spot of light a retinal response potential is generated and/or a visually evoked response is generated.

Abstract: A microprocessor based instrument designed to retrofit into existing perimeters utilizing the mechanics and stimulus control aspects of the existing perimeter. The device includes an array board positioned adjacent the perimeter mechanical arm and includes a multiplicity of visual indicators spatially arranged in a composite pattern of testing locations required for one or more ophthalmic testing procedures. A processor is connected to the array board for sequentially actuating the visual indicators in accordance with the testing procedure whereby the operator guides a cursor attached to the perimeter mechanical arm to align with the actuated indicators and control the location of the perimeter test stimulus. The processor includes means for sensing the position of the cursor, silently presenting a light flash to the patient, and a memory which records the patient's responses.

Abstract: In a light measuring optical system for use in measurement of pulse waves in the artery at the eye fundus or oxygen saturation in the artery blood at the eye fundus, light for illuminating the eye fundus is converged on the surface of the cornea of the eye to be measured and enters the interior of the eye through a small area within the pupil. Light reflected at the surface of the cornea is converged and blocked at its converging position while the light reflected from the eye fundus is allowed to pass by the light blocking member and reach a photocell. Coupled with the photocell is an electric circuit which transmits AC component of photocell output when DC component of the same assumes its minimum value.

Abstract: A device for connecting a peripheral unit to an optical bus-line which comprises a substrate onto which are integrated a first optical waveguide for being inserted in the path of the bus-line, a second optical waveguide for being connected to the emitting circuit of the peripheral unit, a third optical waveguide for being connected to the receiving circuit of the peripheral unit, and three couplers for intercoupling these waveguides. A plurality of connections related to the peripheral unit are provided for controlling the couplers in order to control the emission or the reception of information on or from the bus-line.

Abstract: An achromat microscope objective with high magnification comprising a first, second, third and fourth lens components, the first lens component being a comparatively thick meniscus lens, the second lens component being a positive meniscus lens with comparatively small thickness, the third lens component being a cemented doublet, the fourth lens component being a cemented doublet, aberrations especially astigmatic difference and curvature of field of the microscope objective being corrected favorably.

Abstract: The present invention relates to a large aperture telephoto-lens consisting of a positive front lens group including a positive lens, a negative lens and a positive lens in sequence and a rear lens group arranged distant from the front group on the optical axis and including a fixed negative sub-group and a movable negative sub-group for focusing, whereby the following relations are satisfied. ##EQU1## Hereby, v.sub.1, v.sub.2, v.sub.3 are Abbe's numbers of the lenses constituting the front lens group; n.sub.1, n.sub.2, n.sub.3 are refractive indices of the lenses constituting the front lens group; R.sub.2 is the radius of curvature of the image side surface of the object side positive lens in the front lens group; R.sub.3 is the radius of curvature of the object side surface of the negative lens in the front lens group; and f is the focal length of the whole system when an object at the infinite distance is in focus.

Abstract: A wide-angle door viewer providing a large wide-angle outdoor view which can be zoomed and is readily perceptible without closely approaching the eyepiece, which comprises an optical lens barrel having relatively large diameter lenses in positions of reverse Galileo system, a mounting barrel for mounting the lens barrel to a door or the like, and a zoom barrel fitted slidably to the mounting barrel and having a relatively larger diameter eyepiece on which the large view is provided for direct but distanced observation.

Abstract: A device useful for the analysis and measurement of the constituents of solid or liquid media consists of a hermetically closed container containing chemical or biological reactants necessary for the analysis, in liquid, lyophilized or solid form. The container constitutes a hollow space formed in a perforatable material inert with respect to the participants in the reaction. It includes a non-removable rigid cover which is advantageously optically flat at least on its inner surface and optically transparent over at least its central portion. The device and method are applicable to any measurements and analyses, whether manual or automatic, of the constituents of liquid or solid media, notably test samples of biological media.

Abstract: The disclosure is of a device for connecting togetheer two optical devices, and is primarily intended for quick connection and disconnection of two optical devices such as an endoscope and a viewing tube or two lenses.

Abstract: Improvements in an optical system for a compact camera having an improved form of a zoom objective lens arranged substantially enclosed within the housing of the camera which is made compact by a twice folded optical path and a through-the-lens viewing system.

Abstract: The system of the present invention provides means for quick and accurate measurement of various wheel alignment parameters of motor vehicles by the use of reflected light beams. A laser source mounted near the front end of the vehicle provides a pair of light beams directed 180 degrees apart across the front end of the vehicle. Each of the beams is reflected along the side of the vehicle by a roof mirror set mounted near each front corner of the vehicle. The mirror sets each deflect a beam through a constant net angle of 90 degrees for a wide range of angles of incident light so that the laser source can be rotated to quickly provide parallel beams which are aligned substantially parallel to the sides of the vehicle. These mirror sets also provide stable beams and present small movements thereof from affecting the accuracy of the measurements being made.

Abstract: An ophthalmological instrument having optical elements providing an examination light beam path and an illumination light beam path. The optical elements include an objective for producing an inverted magnified flattened image of the fundus of the eye, and further elements for focusing this image at infinity and projecting it selectively either into an observation tube or into a camera or other documentation device where a record of the image may be made. The illumination beam path includes a source of light and means of projecting this light, via a perforated mirror, into the pupil of the patient.

Abstract: An ophthalmological instrument for stereoscopic examination of the fundus or retina of the eye of a patient, and documentation thereof, as by photographing it. The instrument provides an observation light beam path, and an illumination light beam path. In the observation beam path are various optical elements for producing an image of the fundus at appropriate places, and a beam splitter to split the beam into two parts for stereoscopic viewing. A movable deflector can be shifted to a position to deflect at least part of the beam to a camera or other documentation device.

Abstract: An eye fundus observing optical system which can perform the diopter correction of the inner focus type by the construction that a relay lens system for forming a second fundus image from a first fundus image formed by an objective lens is constituted by two first and second positive lenses, and the front focus of the first lens is coincident with the back focus of the objective lens, and the second lens is movable in the direction of the optic axis. Further, in accordance with the diopter of the eye to be examined, the second lens is moved in the direction of the optic axis.

Abstract: A riflescope is provided with an auxiliary optical system for forming an internal image of data or information disposed outside of the normal eyepiece field of view. A primary application of the system is to transfer an optical image of a target-range figure marked on an external adjustment knob for viewing at the periphery of the field of view without interference with or cluttering of the target image.

Abstract: The present invention relates to a Gauss type lens, comprising a first positive meniscus lens whose convex surface is directed to the object, a second positive meniscus lens whose convex surface is directed to the object, a third negative meniscus lens whose convex surface is directed to the object, a fourth negative meniscus lens whose concave surface is directed to the object, consisting of a negative and a positive lens cemented on each other, the fifth positive meniscus lens whose concave surface is directed to the object and the sixth positive lens and satisfying the following conditions.(1) 0.29f<r6<0.33f(2) 0.30f<.vertline.r7.vertline.<0.35f(3) 0.65f <r4<0.8f(4) 1.3<(r5/r4)<1.8(5) 0.14f<d3+d4+d5<0.18f(6) 0.13f<d7+d8<0.17fwhereby f is the focal length of the photographic lens, ri the radius of curvature of the i-th lens surface and di the i-th lens surface distance.

Abstract: A method and apparatus for measuring thermal diffusivity and molecular relaxation processes in a sample material utilizing two light beams, one being a pulsed laser light beam for forming a thermal lens in the sample material, and the other being a relatively low power probe light beam for measuring changes in the refractive index of the sample material during formation and dissipation of the thermal lens. More specifically, a sample material is irradiated by relatively high power, short pulses from a dye laser. Energy from the pulses is absorbed by the sample material, thereby forming a thermal lens in the area of absorption. The pulse repetition rate is chosen so that the thermal lens is substantially dissipated by the time the next pulse reaches the sample material. A probe light beam, which in a specific embodiment is a relatively low power, continuous wave (cw) laser beam, irradiates the thermal lens formed in the sample material.