Abstract: A telephoto lens assembly comprises sequentially from an object side to an image side along an optical axis a first lens, a second lens, a stop, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative refractive power and includes a convex surface facing the object side. The second lens has negative refractive power and includes a convex surface facing the image side. The third lens has positive refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth lens has positive refractive power. The fourth lens and the fifth lens are cemented.

Abstract: A prism module includes a first prism including a first surface, a second surface and a third surface, a roof prism including a roof surface and a fourth surface, a second prism including a fifth surface, a sixth surface and a seventh surface, and a third prism including a light access surface, a first reflecting surface and a second reflecting surface. A light source is disposed above the second prism and adjacent to the first and the roof prisms. A light beam emitted by the light source enters and is reflected by the third prism, enters the second prism through the seventh surface, passes through the sixth surface, enters the first prism through the third surface, and is reflected by the second surface to leave the prism module. The light beam leaving the prism module is parallel to a baseline passing through the first, the second and the fourth surfaces.

Abstract: A range finder includes a laser transmitter, a laser receiver, a large-aperture objective lens unit, an image sensing device, a display device and a microphone. The laser transmitter is configured to emit a laser beam to a measured object. The laser receiver is configured to receive a reflected laser beam reflected by the measured object. The objective lens unit is configured to allow visible light reflected by the measured object to pass therethrough, includes an objective lens and a focusing lens and has a length defined by the objective lens and the focusing lens. The image sensing device is configured to receive the visible light passing through the objective lens and generate an image signal. The length is constant when the objective lens unit is moved with respect to the image sensing device for focusing operation.

Abstract: A camera device is packaged inside an external shell of an electronic apparatus. The external shell has an opening. The camera device has a transparent plate, a part of which is adjacent to the opening of the external shell. The transparent plate forms an accommodating space for accommodating other components of the camera device. Thus, the dust can be prevented from falling into a shutter blade room of the camera device. The camera device also includes a shutter blade, a driver, and a plate. The plate has an aperture, and the aperture of the camera device is defined thereby. The aperture of the plate is completely pervious to light when the shutter blade is at a first position, and the aperture of the plate is partially pervious to light when the shutter blade is at a second position, thereby changing the aperture of the camera device.

Abstract: A sight includes an inner lens barrel, a compensating device and a converting unit. The inner lens barrel includes a plurality of lenses constituting an optical axis. The compensating device includes a base, an adjusting unit and an adjusting cap. The adjusting unit is disposed on the base, is penetrated through the base and is placed against the inner lens barrel. The adjusting cap is connected to the adjusting unit, wherein the adjusting cap is rotated for axially moving the adjusting unit, and the inner lens barrel is pushed by the adjusting unit so that the optical axis is shifted. The converting unit is configured to convert shift amount of the optical axis to an electric signal corresponding to number of rotation of the adjusting cap and output the electric signal.

Abstract: A magnification apparatus includes a main body, an inner sleeve, an outer sleeve, an adjusting ring and a locating element. The inner sleeve is disposed within the main body. The outer sleeve includes a locating hole, wherein the outer sleeve is rotatably disposed around the inner sleeve. The adjusting ring is rotatably disposed around the main body to rotate the outer sleeve relative to the main body and the inner sleeve. The locating element includes a fixing element, an elastic element and a locating sleeve, wherein the locating sleeve is placed to penetrate through the main body and the locating hole and against an outer surface of the inner sleeve, the fixing element is disposed on the adjusting ring, and the elastic element includes a first end placed against the fixing element and a second end placed against an interior of the locating sleeve.

Abstract: A camera device includes a plurality of lenses and an annular body. The annular body is disposed between the object side and the plurality of lenses, between the plurality of lenses, or between the plurality of lenses and the image side. The annular body includes an annular main body, an outer circumferential portion, and an inner circumferential portion, wherein the annular main body connects to the outer circumferential portion and the inner circumferential portion, the annular main body is disposed between the outer circumferential portion and the inner circumferential portion, and the inner circumferential portion is non-circular and surrounds the optical axis to form a hole. The camera device satisfies: Dx>Dy, 1<Dx/Dy<28, where Dx is a maximum dimension of the hole through which the optical axis passes, and Dy is a minimum dimension of the hole through which the optical axis passes.

Abstract: A lens assembly includes a first lens, a second lens, a third lens, and a fourth lens, wherein the first lens, the second lens, the third lens, and the fourth lens are arranged in order from an object side to an image side along an optical axis. The first lens is with positive refractive power. The second lens is with negative refractive power. The third lens is with refractive power. The fourth lens is with negative refractive power. The lens assembly satisfies: 0.2<D4/TTL<0.6, wherein D4 is an effective diameter of the fourth lens and TTL is an interval from an object side surface of the first lens to an image plane along the optical axis.

Abstract: A compensating mechanism includes a base, an adjusting unit, an adjusting cap and a stop unit. The adjusting unit is disposed on the base. The adjusting cap is configured to move the adjusting unit with respect to the base so as to form a first circumferential movement range. The stop unit includes a sliding element and a limiting element, wherein the limiting element includes a movement region, and the adjusting cap is configured to move the sliding element along the movement region so as to form a second circumferential movement range. A sum of a first central angle corresponding to the first circumferential movement range and a second central angle corresponding to the second circumferential movement range is a fixed value. The invention also provides a sight, wherein the sight includes a main body, an objective unit, an ocular unit, an inner lens barrel and the compensating mechanism.

Abstract: A sight includes a main body, an erecting unit, and a first adjusting element. The erecting unit includes a second magnetically attractable element and movably disposed within the main body. The first adjusting element includes a first magnetically attractable element and is movably disposed on the main body. The first adjusting element extends into the main body and against the erecting unit. The first magnetically attractable element attracts the second magnetically attractable element so that the first adjusting element contacts the erecting unit. The first adjusting element is rotatable to move the erecting unit in a first direction.

Abstract: A backlight module includes a housing, a lighting curtain, a light source, and a diffusion plate. The housing includes a base plate and a side wall inclined relative to the base. The lighting curtain is disposed in the housing, and includes a central portion separated from the base plate, and an edge portion inclined relative to the central portion. The edge portion is connected to the side wall. The light source is disposed on the base plate, and located under the central portion. The diffusion plate is located on the lighting curtain, and separated from the central portion. The edge of the diffusion plate is connected to the side wall.

Abstract: A lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in order from an object side to an image side along an optical axis. The first lens includes a convex surface facing the image side. The second lens includes a concave surface facing the object side. The third lens is a biconvex lens with positive refractive power. The fourth lens is with negative refractive power and includes a concave surface facing the object side. The fifth lens is with positive refractive power and includes a convex surface facing the image side. The lens assembly satisfies: ?20?f1/f?2, wherein f1 is an effective focal length of the first lens and f is an effective focal length of the lens assembly.

Abstract: A lens assembly comprises sequentially from an object side to an image side along an optical axis a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens is a meniscus lens with negative refractive power. The second lens is a meniscus lens with negative refractive power. The third lens is a biconvex lens with positive refractive power. The fourth lens is a biconvex lens with positive refractive power. The fifth lens is a biconcave lens with negative refractive power. The sixth lens is a biconvex lens with positive refractive power.

Abstract: A wide-angle lens assembly comprises sequentially from an object side to an image side along an optical axis a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens is with negative refractive power and includes a concave surface facing the image side. The second lens includes a concave surface facing the object side. The third lens includes a convex surface facing the image side. The fourth lens includes a convex surface facing the object side. The fifth lens includes a concave surface facing the image side. The sixth lens is a biconvex lens with positive refractive power. The second lens and the third lens are cemented to form a first cemented lens with positive refractive power. The fourth lens and the fifth lens are cemented to form a second cemented lens with positive refractive power.

Abstract: In an adjusting knob mechanism, a base includes a first supporting portion and a second supporting portion. A first clicking gear includes a plurality of first indentations and disposed on the first supporting portion. A second clicking gear includes a plurality of second indentations and disposed on the second supporting portion. A limiting element is disposed on the base. A movable element is disposed within the limiting element and configured to move in an axial direction of the base relative to the limiting element. A connecting mechanism extends into the limiting element. An adjusting cover is connected to the movable element by the connecting mechanism, so as to move the movable element in the axial direction of the base relative to the limiting element and the second clicking gear. The adjusting cover is configured to rotate the limiting element and the movable element through the connecting mechanism.

Abstract: A bi-reticle sight includes a main body, a first reticle, a second reticle and a sensor. The first reticle is configured to move along with the main body. The second reticle is configured to move relative to the first reticle. The sensor is configured to detect the main body to determine whether the main body is in a standard attitude. Wherein the first reticle coincides with the second reticle when the main body is in the standard attitude, the second reticle is moved relative to the first reticle to a position corresponding to the standard attitude when the main body is not in the standard attitude.

Abstract: A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is a meniscus lens with negative refractive power and includes a convex surface facing the object side. The second lens is with negative refractive power and includes a concave surface facing the object side. The third lens is with positive refractive power and includes a convex surface facing the image side. The fourth lens is with positive refractive power. The fifth lens is with positive refractive power. The sixth lens is with negative refractive power. The seventh lens is with refractive power.

Abstract: A projection lens assembly includes a first lens group, a second lens group, a third lens group and a fourth lens group, all of which are arranged in order from a projection side to an image source side along an optical axis. The first lens group is with negative refractive power. The second lens group is with positive refractive power and includes a projection side surface and an image source side surface, wherein both of the projection side surface and the image source side surface are convex surfaces. The third lens group includes a convex surface facing the projection side. The fourth lens group is with positive refractive power and includes a convex surface facing the image source side. The projection lens assembly satisfies: 1.4<F<3.5, wherein F is an F-number of the projection lens assembly.

Abstract: An image stitching method for use in an image processing apparatus is provided. The method includes the steps of: receiving a first video file and a second video file from an image capturing unit, wherein the first video file includes at least one first image and a first audio track, and the second video file includes at least one second image and a second audio track; calculating delay time between a first acoustic feature of the first audio track and a second acoustic feature of the second audio track to synchronize the first image and the second image; converting the first image and the second image into a first adjusted image and a second adjusted image; and performing an image stitching process on the first adjusted image and the second adjusted image to generate a stitched image.