Abstract: A stepwise variable zoom lens system for creating an image of a scene on an image sensor includes a first lens unit which has a positive refracting power, an aperture, a second lens unit which has a positive refracting power, and a third lens unit which has a negative refracting power. Each of the first, the second and the third lens units is constructed from a single block. The third lens unit is fixed. The first and the second lens units are selectively positioned in a first position and a second position, and the position is changed from one to the other by moving the first and the second lens units in opposite direction.

Abstract: A zoom mechanism of imaging lens module is disclosed which includes a first lens carrier defining an optical axis, a second lens carrier, a spring connecting with the two lens carriers, a guiding means, a rotary cylinder for holding the two lens carriers and a stationary cylinder for holding the rotary cylinder. The rotary cylinder defines two cam rims, each cam rim has a stem, a beginning rim, an end rim, a guiding rim connecting with the beginning rim and the end rim, wherein the beginning rim and the end rim are formed perpendicular to the optical axis and arranged to space a certain distance therebetween in circumferential direction and axial direction respectively. The spring and the rotary cylinder push the two cam rims to move along the guiding means. The stationary cylinder defines a leading slot which extends in circumferential direction and radial direction for the stem passing through.

Abstract: A stepwise variable zoom lens system according to the present invention has, in order from an object side, a first lens group of negative refracting power, a second lens group of positive refracting power, and a third lens group of positive refracting power. The first and third lens groups are constructed from a single block. The second lens group includes a positive first lens unit and a negative second lens unit which is also constructed from a single block. The first and third lens groups are fixed, and the second lens group is movable to be selectively disposed in several discrete positions. The focal lengths of the lens groups satisfy the following relations: f 2 · ( 1 + z ) > - f 1 f 2 · ( 1 + 1 z ) > f 3 · f b f 3 - f b wherein f1, f2 and f3 denote the focal lengths of the first, second and third lens groups respectively, fb denotes the back focal length of the stepwise variable zoom lens system, and z denotes the zoom ratio.

Abstract: A zoom lens barrel includes a first stationary cylinder defining an optical axis. The first stationary cylinder has a tubular wall surrounding a passage. A guiding and positioning slot is defined in the tubular wall along the optical axis with a plurality of anchor points and block points alternately arranged on edges thereof. A first lens carrier is held in the passage and has a driving pole. A second lens carrier surrounds the tubular wall and has a retainer and a first guiding slot. A second stationary cylinder surrounds the second lens carrier and has a stopper and a second guiding slot. The driving pole passes through the guiding and positioning slot, the first and the second guiding slot and is positioned in one of the anchor points. The spring is retained between the first stationary cylinder and the second lens carrier to push the second lens carrier moving with the first lens carrier till the retainer is blocked by the stopper.

Abstract: A zoom lens system comprises a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power. The first lens group includes a first lens unit having negative refractive power, which includes a negative lens and a negative lens having at least one aspherical surface, and a second lens unit including a positive lens. The second lens group includes an aperture element, a first lens unit having positive refractive power, which has a positive lens, a second lens unit having positive refractive power, which has a cemented positive lens including a positive lens and a negative lens, and a third lens unit having negative refractive power, which has a negative lens having at least one aspherical surface. The third lens group includes a positive lens plating with a multi-layer coating in the surface facing to the object side in order to cut off infrared rays and decrease the influence of infrared rays on image.

Abstract: A zoom lens control mechanism includes a lens barrel with a lens group arranged in advance therein, a lens barrel support portion for the lens barrel seated on, a guiding device and a driving device. The lens barrel has three cylinders with the same center, and each of the cylinders has a post disposed at the bottom edge thereof and arranged with the imaginary center of the cylinders on the same line. Each of the cylinders except the innermost cylinder further has an elongated slot extended along the outer surface thereof. The guiding device is received in the two elongated slots and fixed on the innermost cylinder for leading the cylinders of the lens barrel moving relatively along the optical axis in the range of the allowable deviation. The lens barrel support portion includes three protruding cylinders which have the same center thereof for mating with the corresponding cylinders of the lens barrel.

Abstract: A modular electronic image-capturing system comprises at least two detachable and interchangeable image-forming modules and an electronic image-capturing module. The image-forming modules include a film-scanning module with the lens designed for short conjugate distances and an image-forming lens designed for long conjugate distances for general photography. The film-scanning module has an illumination device for illuminating transparent film. The film-scanning module also includes a film carrier which accepts and places at least one piece of photographic films in correct location. The modular electronic image-capturing system further includes the control circuits and connecting interface in order to manipulate the image-forming modules.

Abstract: This invention discloses a shutter and lens apparatus including a lens housing for receiving a multi-function support. The multi-function support includes a lens seat fitting with a lens and two solenoid valves attached on its bottom. A shutter slice and a diaphragm are mounted on the top surface of multi-function support, and pivot around a shaft projected thereon. Two movable rods of the solenoid valves are coupled with the shutter slice and diaphragm to drive them passing a light path, an axis through the lens, for controlling time and quantities of light projected through the lens. A housing cover encases the lens, the multi-function support, and a spring into the lens housing.

Abstract: A retrofocus-type lens system comprises, in order of the object side, three lens units wherein the first lens unit serves as the front lens group of negative refractive power and the second lens unit in combination with the third lens unit serves as the rear lens group of positive refractive power. The first lens unit has meniscus lens elements with concave surfaces on the object side. A stop is placed between the front lens group including the meniscus lens elements and the rear lens group including both the second and the third lens units. The lens element on the image side of the first lens unit of the front lens group is of negative power, and the lens element on the image side of the third lens unit is a negative biconcave lens.

Abstract: A retrofocus-type lens system comprises, in order of the object side, three lens units wherein the first lens unit serves as the front lens group of negative refractive power and the second lens unit in combination with the third lens unit serves as the rear lens group of positive refractive power. The first lens unit has meniscus lens elements with concave surfaces on the object side. A stop is placed between the front lens group including the meniscus lens elements and the rear lens group including both the second and the third lens units. The lens element on the image side of the first lens unit of the front lens group is of negative power, and the lens element on the image side of the third lens unit is a negative biconcave lens.

Abstract: This invention relates to a method for aligning an image sensor, comprising the steps of providing a circuit substrate and an image sensor, providing a device for aligning the image sensor with the circuit substrate, and assembling the circuit substrate, the image sensor and the device so as to maintain the preciseness and consistency of the assembly of the image sensor and the circuit substrate. Furthermore, a device for aligning an image sensor comprises a frame having a receptacle and an opening at the center thereof. The image sensor is received within the receptacle. The peripheral dimension of the image sensor is smaller than that of the opening so that the image sensor is confined in the opening. The alignment device insures the desired assembly of the image sensor and the circuit substrate.