Abstract: A compact zoom lens system is disclosed which comprises a first lens group having an overall positive refractive power and a second lens group having an overall negative refractive power. The magnification of the compact zoom lens system can be varied by varying the distance between the first lens group and the second lens group in accordance with the following condition:0.59<f.sub.I /f.sub.w <0.67where f.sub.w represents the focal length of the entire lens system, and f.sub.I represents the focal length of the first lens group.

Abstract: A compact lens system is disclosed which includes a first lens group and a second lens group. The first lens group, which has an overall positive refractive power, includes a first meniscus lens, convex toward an object, and having a positive refractive power. Also included is a second biconcave lens having a negative refractive power, and a third biconvex lens which is connected to the second lens and which has a positive refractive power. The first lens group further includes a fourth biconvex lens which has a positive refractive power. The second lens group has an overall negative refractive power, and includes: a fifth concave lens having a positive refractive power; a sixth concave lens having a negative refractive power; and a seventh lens having a negative refractive power. The magnification of the system can be changed by varying a distance between the first and the second lens group in accordance with the following condition:1.1<(f.sub.bT -f.sub.bW)/(L.sub.T -L.sub.W)<1.24where L.sub.

Abstract: An automatic inspection system for camera lenses and method thereof using a line charge coupled device (CCD) which can process a signal easily and perceive a focal distance of lenses exactly by focusing automatically using a modulation transfer function (MTF) method when designing lenses. The automatic inspection system for camera lenses using a line CCD comprises a light source, a chart, a collimator, camera lenses, a mirror, an image pickup part, a signal converter, and a control part.

Abstract: A wide-angle zoom lens system which can reduce variation in aberrations and obtain a sufficient back focus distance at the wide angle position by making the view angle wide at the wide angle position and making the whole length of the optical system short at the telephoto position.

Abstract: A wide-angle variable magnification viewfinder comprises from an object side: an objective lens group of a positive refractive power, including a fixed first lens unit of a negative refractive power, a movable second lens unit of a negative refractive power for compensating the change of a view angle, a movable third lens unit of a positive refractive power for changing the magnification of the optical system, a prism for erecting an image, a fixed fourth lens unit of a positive refractive power; and an eyepiece lens group of a positive refractive power; wherein the objective lens group forms an actual image of an object and the actual image can be observed through the eyepiece lens group; and wherein -1.20<L.sub.t /f.sub.1 <-0.75, 0.04<m2w.times.m2.sub.t <0.13; where f.sub.1 represents a focal length of the first lens unit of the objective lens group, L.sub.

Abstract: A super wide-angle variable magnification viewfinder includes an objective lens group of a positive refractive power. The objective lens group further includes a fixed first lens unit of a negative refractive power, a movable second lens unit of a negative refractive power for compensating the change of a view angle, a movable third lens unit of a positive refractive power for changing the magnification of the optical system, and a fixed fourth lens unit of a positive refractive power. Also included in the finder is a prism for erecting an image and an eyepiece lens group of a positive refractive power. The objective lens group forms an actual image of an object, and the actual image can be observed through the eyepiece lens group. The view finder satisfies the condition:1.75<L.sub.t /f.sub.T <1.87where f.sub.T is the focal length of the objective lens group at the telephoto position, and L.sub.t is the distance from a first lens surface of the objective lens group to a focus.

Abstract: Disclosed is a telephoto-type lens system of a head separated charge coupled device (CCD) camera, which includes a first lens group having a positive focal length, a second lens group having a negative focal length, and a third lens group. The first lens group has a first convex lens surface facing an object and an upper convex surface. The third lens group has a second lens with a negative focal length joined to a first lens with a positive focal length. An image angle greater than 29.degree. and high definition images can be achieved with the present invention.

Abstract: An advanced photo system (APS) camera includes a keyboard mounted on the inner surface of a rear cover hinged to the camera body. The camera also includes an LCD for displaying information entered on the keyboard, wherein the LCD is mounted at the rear of the camera body so as to be exposed when the rear cover is opened to provide user access to the keyboard. The information entered on the keyboard and displayed on the LCD is recorded on a magnetic track included on the photographic film advanced through the camera. The keyboard and the LCD may be separated from or remote from the APS camera, and the keyboard may be replaced with a plurality of input dials.

Abstract: An apparatus for inputting and outputting the optical image of a scene with means for compressing and expanding the electrical video signals of the optical image. Electrical video signals of the optical image are produced. A buffer memory temporarily stores the electrical video signals. A digital encoder encodes the electrical video signals to produce NTSC or PAL signals displayed on a television set, monitor, or color liquid crystal display (LCD). A compression/expansion circuit compresses or expands the electrical video signals to produce compressed or expanded image data. A memory card stores the compressed image data, and a microprocessor controls the operation of the apparatus. Thus, the electrical video signals are compressed or expanded to be permanently stored in the memory card as the image data or transferred to the digital encoder as recovered video signals.

Abstract: A flash control circuit for use with a system controller is disclosed. The circuit includes a booster unit for receiving a first voltage signal and for outputting a second voltage signal to a lamp. The booster unit boosts the first voltage signal and then charges the boosted first voltage signal. Also included is a voltage sensor for sensing the voltage of the second voltage signal and for transmitting a voltage indication signal to the system controller. An oscillator outputs the first voltage signal according to an oscillation control signal from the system controller, and a triggering unit generates a trigger pulse according to a lighting control signal output from the system controller. The circuit further includes an accidental lighting prevention unit coupled to the triggering unit.

Abstract: A camera flash control device and method thereof for preventing red-eye phenomenon which can prevent red-eye phenomenon by controlling the amount of light and a number of times the light is emitted from a flash according to a distance measured from an object to a camera with a built-in flash. The camera flash control device comprises a first photographic mode selector, an automatic distance measuring circuit, a zoom position sensor, a second photographic mode selector, a micro-controller and a flash.

Abstract: Described in this invention is a microscope that can examine a specimen of an anisotropic property regardless of the specimen being thin or thick, i.e., opaque or transparent. The video microscope includes a first light guide for a transmission method; a first polarizer for partially polarizing the light from the first light source, arranged beneath a stage on which a specimen is placed; a second light guide for reflection method; a second polarizer for partially polarizing the light from the second light source, provided in the second light guide; a lens assembly admitting the polarized light from the first or second polarizer and including an objective, an analyzer, and a compensating plate; a beam splitter for reflecting the polarized light from the second polarizer to an object provided in the lens assembly; a CCD mount in which CCD is provided, mounted on the lens assembly; and height and focus adjustment.

Abstract: A camera and method are disclosed which provide a photographer with a picture composition guide that may be viewed through the viewfinder. Standard composition points corresponding to golden section points are displayed for the photographer to see. LCD's or LED's are used to display the composition points, and an external display portion allows the photographer to check a display state of the standard composition points.

Abstract: A function display system of a camera including a switch block, an automatic distance measuring circuit, a brightness measuring circuit, a motor driving circuit, and a function display unit. The CPU causes the function display unit to display each camera function in serial order after a power switch is pressed, thereby informing the user of camera functions. When a user presses a flash function or photograph function switch for a predetermined interval, the CPU changes camera sub-functions. The CPU displays a sub-function arranged by a user and a special sub-function arranged by a camera for a longer interval, allowing the user to select the sub-functions more easily. As a result, the camera display system and method provides a camera having improved convenience and efficiency.

Abstract: An optical positioning device using astigmatic optical elements. A laser diode emits astigmatic, elliptically shaped light which is not corrected. A first lens condenses the light and transmits the light to an object to be positioned. The light reflected off of the object is monitored while the object is moved. Because of astigmatism, the first lens does not have a true focal point. There is a point, however, where the vertical and horizontal components of the transmitted light are equal. The first lens is positioned so that the desired position of the object corresponds to this equal point.

Abstract: A camera having a automatic focus system for focusing a lens on an object to be photographed which comprises a device for measuring a plurality of distances between the object and the camera. The camera determines an auto focus distance based on a selected one of the predetermined conditions each representing a relationship between each of a plurality of measured distances under a respective circumstance. The camera controls the movement of the lens at least partially based on the auto focus distance.