Abstract: A headphone device includes a container and a first electrical connector. The container includes a first loudspeaker disposed in the container, a second loudspeaker disposed in the container, and a first cross-feed loudspeaker disposed in the container. The first electrical connector is disposed on the container, and is electrically connected to the first loudspeaker, the second loudspeaker and the first cross-feed loudspeaker.

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 sequence from an object side to an image side along an optical axis. The first lens is with refractive power and includes a convex surface facing the object side. The second and third lenses are with refractive power. The fourth lens is with refractive power and includes a convex surface facing the image side. The fifth lens is with negative refractive power. The lens assembly satisfies: 0?f1/f2?6, (Vd1+Vd2)/2>40, Vd1?Vd3, Vd2?Vd3, Vd5?Vd3 wherein f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens and Vd1, Vd2, Vd3, Vd5 are Abbe numbers of the first, second, third, fifth lenses.

Abstract: A circuit layout of laser source driving circuit includes a laser element, a first layout layer, a second layout layer, a first trace and a second trace. The first layout layer includes a first transistor. The second layout layer includes a second transistor, a capacitor, a first resistor and a second resistor. The first trace includes a first conductive line connecting the first resistor and the capacitor and a second conductive line connecting the capacitor and the laser element. The second trace includes a third conductive line connecting the second resistor and the second transistor, a fourth conductive line connecting the second transistor and the first transistor and a fifth conductive line connecting the first transistor and the laser element. A total length of the first trace and the second trace ranges from 13 mm to 19 mm.

Abstract: A lens assembly includes 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 stop, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The first lens is a meniscus lens with refractive power. The second lens is a meniscus lens with refractive power. The third lens is a biconcave lens with negative refractive power. The fourth lens is a biconvex lens with positive refractive power. The fifth lens is a biconvex lens with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with negative refractive power. The eighth lens is with positive refractive power. The sixth lens and the seventh lens are cemented together.

Abstract: A sight includes a cylinder, a first lens, a first lens seat, and at least one first elastic member. The first lens is disposed in the cylinder. The first lens seat carrying the first lens is disposed in the cylinder. The first elastic member is disposed between an outer surface of the first lens seat and an inner periphery of the cylinder, wherein the first lens seat is tightly fitted with the cylinder and light enters the cylinder through the first lens.

Abstract: A projector includes a polarization changing mechanism and a polarized beam splitter. The polarization changing mechanism is movable. A first polarized beam is configured to pass or not pass through the polarization changing mechanism. The first polarized beam transforms into a second polarized beam when the first polarized beam passes through the polarization changing mechanism. The polarized beam splitter has a light splitting surface. The first polarized beam enters the polarized beam splitter and is guided by the light splitting surface to travel in a first direction, when the first polarized beam does not pass through the polarization changing mechanism. The second polarized beam enters the polarized beam splitter and is guided by the light splitting surface to travel in the first direction or a second direction, when the first polarized beam passes through the polarization changing mechanism and transforms into the second polarized beam.

Abstract: A panoramic lens assembly includes a first lens assembly which includes a first lens group, a first prism and a second lens group, all of which are arranged in order from a first object side to a first image side along a first optical axis. The first lens group is with negative refractive power and includes a first and a second lens. The first prism includes a first incident surface, a first reflective surface and a first exit surface. The second lens group is with positive refractive power and includes a third, a fourth, a fifth, a sixth and a seventh lens. The first lens assembly satisfies: 0.2?TTL1/?1m?0.4, wherein TTL1 is an interval in mm from an object surface of the first lens to a first image plane along the first optical axis and ?1m is a half maximum field of view in degree for the first lens assembly.

Abstract: An optical lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with positive refractive power and includes a convex surface facing the object side. The second lens is with refractive power. The third lens is with refractive power. The fourth lens is a meniscus lens with refractive power. The fifth lens is with positive refractive power. The sixth lens is with positive refractive power. The optical lens assembly satisfies: ?1.8?f4/f??1.3 wherein f4 is an effective focal length of the fourth lens and f is an effective focal length of the optical lens assembly.

Abstract: A lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens is with positive refractive power. The second lens is with negative refractive power. The third lens is with positive refractive power. The fourth lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side. The fifth lens includes a concave surface facing the image side. The first lens and the third lens are made of the same material and an Abbe number of the first lens is the same as an Abbe number of the third lens. An Abbe number of the first lens, an Abbe number of the third lens and an Abbe number of the fifth lens are greater than an Abbe number of the second lens.

Abstract: A pico projector includes a housing, a lens, a light engine, a control module and a central processing module. The housing includes a main body and a cover. The lens is disposed in the housing. The light engine is disposed in the housing and configured to produce light including image signals and project the light through the lens. The control module is configured to provide a control signal. The central processing module is disposed in the housing and configured to rotate or move the cover with respect to the main body according to the control signal so as to create an opening for enhancing heat dissipation of the interior of the housing.

Abstract: An active protection system for protecting an object includes a first lens, a second lens, a processing unit and an alarm unit. The first lens is configured to receive first light and generate a first image. The second lens is configured to receive second light and generate a second image. The processing unit is configured to obtain a characteristic value of the object from the second image, determine whether the characteristic value reaches a pre-set value, and judge whether the object is regulated in a predetermined period after the characteristic value reaches the pre-set value. The alarm unit is configured to raise an alarm under control of the processing unit if the object is not regulated in the predetermined period after the characteristic value reaches the pre-set value.

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

Abstract: A zoom lens, in sequence from an object side to an image side along an optical axis, comprises a first lens group; a second lens group; a stop; and a rear lens group and comprising a third lens group, a fourth lens group, and a fifth lens group; the fourth lens group further comprises an image correction lens which is able to shifted in a direction transverse to the optical axis of the zoom lens to stabilize the picked-up image when the zoom lens vibrates; furthermore, the zoom lens satisfies the following condition: (1??p)×?r>2, where ?p is a lateral magnification of the image correction lens when the zoom lens is at the telephoto end, and where ?r is a lateral magnification of the lenses in the rear lens group except for the lenses in front of the image correction lens when the zoom lens is at the telephoto end.

Abstract: A sight includes a main body including a focus lens system and an erecting lens system; a first adjusting member disposed in the main body and configured to move the focus lens system along the optical axis; a second adjusting member disposed in the main body and configured to move the erecting lens system in a first direction which is perpendicular to the optical axis; a focus adjusting module disposed in the main body and configured to drive the first adjusting member so as to move the focus lens system along the optical axis; and a first adjusting module detachably joined to the focus adjusting module and configured to drive the second adjusting member so as to move the erecting lens system in the first direction.

Abstract: A zoom lens has a four-group zoom configuration, in order from the object side to the image side, consisting of negative, positive, positive, and positive refractive power. The zoom lens carries out zooming from the wide-angle end to the telephoto end mainly by changing the distance between the third lens group and the fourth lens group. Also, the distance between the second lens group and the third lens group may be decreased in the zooming. Focusing is carried out mainly by moving the second lens group along the optical axis. Such a zoom lens is thin and small in size, and has a great imaging performance.

Abstract: The sight includes a main body, a regulating bolt movably joined to the main body, a securing bolt fixed to the regulating bolt, a regulating cover covering the regulating bolt and movable between a first position and a second position with respect to the regulating bolt, a first magnet disposed on the regulating cover, and a second magnet disposed on the regulating bolt and corresponding to the first magnet. The regulating cover is movable with respect to the regulating bolt when the regulating cover moves away from the second position. The regulating cover abuts the securing bolt and is rotatable with respect to the regulating bolt when the regulating cover moves to the first position. The regulating cover engages the regulating bolt when the regulating cover moves to the second position. The regulating cover is maintained in the second position through attraction of the first magnet and the second magnet.

Abstract: A sight includes an adjusting module, a collector ring, a first adjusting element, and an elastic element. The collector ring includes a connecting end connected to the adjusting module, a free end opposite to the connecting end, a periphery connecting the connecting end and the free end, and a notch formed on the periphery and connected to the free end. The first adjusting element includes a first end which abuts the periphery. The elastic element extends in a direction from the free end to the connecting end and abuts the periphery. The elastic element contacts the periphery in a position between the notch and the connecting end. The first end is configured to resist an elastic force exerted by the elastic element and move the collector ring.

Abstract: A prism assembly includes a first prism, a second prism, a roof prism and an optical multilayer film. The first prism includes a first, a second and a third surface. The second prism includes a fourth, a fifth and a sixth surface. The fifth surface faces the third surface. The roof prism includes a seventh, an eighth and a ridge surface. The seventh surface faces the second surface. The optical multilayer film is disposed between the fifth surface and the third surface. A first light beam and a second light beam entering the first prism are totally reflected from the second surface to the optical multilayer film which reflects the first light beam but allows the second light beam to pass through. The second light beam enters the second prism, is totally reflected on the sixth surface, and exits from the fourth surface of the second prism.

Abstract: A wide-angle lens, from an object side to an image side along an optical axis, includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens. The first, second and third lens are with negative refractive power. The fourth, fifth, sixth and seventh lens are with refractive power. The eighth lens is a biconvex lens with positive refractive power. The ninth lens is a biconvex lens with positive refractive power. The first lens, the second lens and the third lens satisfy: ?26<f1/f<f2/f<f3/f<?3 and ?1.64<f123/f<?1.6 wherein f1 and f2 are effective focal lengths of the first and second lenses, f3 and f are an effective focal lengths of the third lens and the wide-angle lens, and f123 is an effective focal length of the combination of the first lens, second lens and third lens.