Goldstar, Co., Ltd.

Samsung Electro-Mechanics Co., Ltd.

Kolen Co., Ltd.

Yong Gyu Yoon

Jung Seok Lee

Jae Hyuk Lee

Jong Jin Lee

Jae Ho Baik

Chan Goo Kang

Myung Jin Lee

A photographic lens optical system includes first to fifth lenses sequentially arranged in a direction away from an object. The first lens may have a negative refractive power, the second lens may have a positive or negative refractive power, the third lens may have a positive refractive power, the fifth lens may have a negative refractive power, and the fifth lens may have a positive refractive power. The first and fifth lenses may be spherical lenses. The fifth lens may be a biconvex lens. The second to fourth lenses may be aspherical lenses. An aperture stop may be between the second and third lenses. The photographic lens optical system may satisfy the inequality &#x2212;2.3&#x3c;f/f&#x3c;&#x2212;1.3, wherein fis the focal length of the first lens group including the first and second lenses, and f is the focal length of the photographic lens optical system.

Photographic lens optical system

Disclosed herein is an image photographing device capable of being auto-focused while moving a lens barrel in an optical axis direction. The image photographing device includes: a lens barrel having at least one lens; a housing receiving the lens barrel therein so that the lens barrel moves in an optical axis direction; and an impact reducing unit elastically supporting the lens barrel in the case in which the lens barrel deviates from a set movement range, thereby primarily damping the lens barrel before the lens barrel deviates from the movement range to collide with other components positioned at an outer side of the lens barrel.

Image photographing device

This invention relates to a magnetron for generating a microwave, in which an upper end shield and a lower end shield for supporting respectively top end and bottom end of a filament, which is a cathode portion, are included, the upper end shield being made in a flange shape having a flat portion of a diameter bigger than an outer diameter of the filament, and a getter for absorbing a generating gas within a vacuum bulb body is mounted on top surface of the upper end shield, and the getter includes a flat portion mounted to the flat portion of the upper end shield and an inclined portion extended downwardly from the end edge of the flat portion so that the electrons generated from the cathode collides and is absorbed.

Inclined getter structure for a magnetron

A condenser unit for magnetron comprising a condenser and a mounting plate. The mounting plate is adapted to fixedly mount the condenser to the upper filter box and provided with an elastic periphery member formed as outwardly extending from the periphery of the mounting plate in order to be inclined upwardly at an angle on the basis of plane of the mounting plate. The elastic periphery member comprises a plurality of slender pieces and slits in order to completely elastically cover a gap which is formed between the mounting plate of the condenser unit and the upper filter box. The elastic periphery member and each slit are formed as having a predetermined height and a predetermined width which are fixed as being relatively smaller than or the same with one fourth of crest value and one fourth of wave length of the fifth higher harmonic, respectively. The inclined angle of the periphery member is ranged from about 30.degree.-about 70.degree..

Growing community of inventors

Seoul, South Korea

Yong Gyu Yoon