An integrated system and method for reading image data. An optical scanner/image reader (15) is provided for reading images and decoding optical information or code, including one (28) and two dimensional (27) symbologies at variable depth of field, including memory (212) and image processing (210) for high speed applications.

Optical scanner and image reader for reading images and decoding optical information including one and two dimensional symbologies at variable depth of field

According to a fluorescent endoscope apparatus for detecting an autofluorescent-light image emitted from a living body upon irradiation thereof by stimulating light, when the endoscope insertion portion is inserted into or removed from a patients body, stimulating light is prevented from entering the eyes of the patient or the operator, ensuring for their safety. When the endoscope insertion portion is outside the body of a patient, the flicker occurring due to the fluorescent or other light illuminating the diagnosis room, which would be detected together with the autofluorescent-light image by a fluorescent-image use camera or with the normal image by a normal-image use camera, is detected by a flicker detector. The flicker detector outputs a detection signal to the stimulating light emission prevention controller, which turns off the power source to the stimulating light laser source by use of a controller computer and thereby prevents the emission of stimulating light.

Fluorescent endoscope apparatus

The wide angle lens system described herein allows projection devices (e.g., rear projection display devices) to be more compact than would otherwise be possible. The lens system includes a wide angle lens stage and a relay lens stage. When operating as a projection device, the relay lens stage projects a distorted intermediate image to the wide angle lens stage, which projects the image for display. The distortion cause by the relay lens stage compensates (i.e., is approximately equal and opposite) for the distortion caused by the wide angle stage. The distortion can be the image shape and/or the focal plane. When operating as a taking device, the wide angle stage provides a distorted image to the relay lens stage, which compensates for the distortion and provide a less distorted, or even non-distorted image, for capture.

Wide angle lens system having a distorted intermediate image

An image forming lens consists of from an object side to an image side in the following order: a first group with a positive refractive power; an aperture stop; and a second group with a positive refractive power, wherein the second group includes, from the object side to the image side in the following order, a biconvex lens, a biconcave lens, a negative meniscus lens a convex surface of which faces the image side, a biconvex lens, and a positive meniscus lens a convex surface of which faces the image side.

Image-forming lens, and camera device and portable information terminal device with the image-forming lens

A zoom lens assembly for a miniature camera, such as those used in cellular telephones and other personal electronic devices, is disclosed. One or more lenses of the zoom lens assembly are moved in and/or out of the optical path of the zoom lens assembly to change the magnification of the lens. Since the magnification does not necessarily require movement of lenses along the optical path of the camera, the length of the zoom lens assembly, and consequently of the camera as well, is substantially reduced.

Zoom lens assembly

An inverse telescopic wide angle lens comprises a diaphragm; a front lens group of an integral positive or negative refractive power, positioned in the object side in front of the diaphragm and having a first lens group of a negative refractive power including a negative lens of which an image-side air-contacting surface is formed as an aspherical surface concave to the image side, and a second lens group of a positive refractive power positioned between the first lens group and the diaphragm; and a rear lens group of an integral positive refractive power, positioned behind the diaphragm and having plural lenses. The negative lens in the first lens group is so constructed that the absolute value of the refractive power of the concave surface on the optical axis is larger than that of the refractive power of the surface at the object side on the optical axis, that the curvature of the concave surface decreases monotonously with the distance from the optical axis, and that the form of the concave surface of the negative lens at the image side satisfies a particular condition. The effective diameter of the lens closest to the object in the first lens group is so constructed as to satisfy a particular condition.

Inverse telescopic wide angle lens

A microscope whose enlargement magnification is changeable includes a plurality of interchangeable first objective lenses of different focal lengths for changing a divergent light flux from an object on a stage into a parallel light flux, a first interchanging device for moving the first objective lenses and interchangeably installing them on a predetermined optic axis, a plurality of interchangeable second objective lenses of different focal lengths for condensing the parallel light flux from the first objective lenses and forming an enlarged image of the object at a predetermined position, an eyepiece for observing therethrough the enlarged image of the object formed by the second objective lenses, a prism for directing the light flux from the second objective lenses to the eyepiece, and a second interchanging device provided between the first interchanging device and the prism for moving the second objective lenses and interchangeably installing them on the predetermined optic axis.

Microscope whose enlargement magnification is changeable

This invention provides a reflecting-refracting, i.e. catadioptric, telephoto lens of F/7 and having an angle of field of 5*. The lens system comprises a positive meniscus lens having a convex surface directing toward an object, a main reflecting mirror of concave back surface having a refracting surface and a reflecting surface, an additional mirror of convex back surface placed near to said positive meniscus and having a refracting surface and a reflecting surface, and a concave lens cemented to said reflecting mirror through a positive lens placed therebetween and having a concave surface directing toward the object. The central portion of the main reflecting mirror is not reflecting; it allows the passage of light. The composite focal length of the negative lens, positive lens and the main mirror is negative when the light rays pass therethrough and the assembled length of the system is less than 1/3.5 of the focal length of the whole system.

Catadioptric telephoto objective lens system

An imaging optical system has a first objective lens movable along the optical axis thereof for focus adjustment and for forming the image of an object at infinity, and a second objective lens for forming the image again at a predetermined position at a predetermined magnification The second objective lens comprises, in succession from the object side, a positive single lens, a negative single lens and a positive single lens disposed with an air space therebetween, and satisfies the following conditions: 005f<Σd<014f 01f<|rsubM |<035f 001f<D<011f where f is the focal length of the second objective lens, Σd is the assembly length of the second objective lens, r M is the radius of curvature of that surface of the lenses constituting the second objective lens which has the greatest positive power, and D is the total of the air spaces between the two positive single lenses and middle negative single lens of the second objective lens

Imaging optical system

PURPOSE:To keep the flatness of an image plane, to prevent the fluctuation of the curvature of field and to excellently hold the compensation of aberrations by satisfying a specified condition in reference to the respective lens groups in the type of an eyepiece lens forming once an image between a first lens group and a second lens group. CONSTITUTION:This eyepiece lens forms once an image between a first lens group G1 and a second lens group G2. By representing the focal distance of the first lens group G1 by f1, the focal distance of a third lens group G3 by f3, the focal distance of the whole system of the eyepiece lens by (f), the radius of curvature of the surface on the entrance side of the meniscus lens whose convex surface faces the entrance side of the first lens group G1 by R1, a number of positive lenses composing the third lens group G3 by (m) and the focal distance of the (i)th positive lens from the entrance side among the lenses composing the third lens group G3 by f3i, the conditions: 0.5<f3/f<1.5, 0.5<f3i/(m.f)<1.5, 1.2<R1/f<5.0, -0.25<f/f1<0.25 are satisfied.

Yoshiyuki Shimizu

Papers

Inverse telescopic wide angle lens

Microscope whose enlargement magnification is changeable

Catadioptric telephoto objective lens system

Imaging optical system

Super-wide visual field eyepiece lens