An optical device with switchable multiple lenses can be mounted on an electronic device through a connecting module, and provides finely-adjusted alignment with an image capturing lens in any position, and provides a zoom or wide-angle lens for the user to change the focal length and view field of the image. A light-filling/polarizing regulation module to fill light and eliminate unnecessary reflected light to avoid marginal diminishing effect of the image. The optical device includes a viewing device, a connecting module and a light-filling/polarizing regulation module, wherein the viewing device includes a lens module located in the housing and having at least two lenses through which an image captured by the image capturing lens is magnified. At least two lenses has the same lens power, or at least two lenses of different magnifications can be used with the switchable lens seat to obtain the effects of switching different lenses.

A photography auxiliary device for a mobile communication unit, including: a bottom plate (1), a lens hole (11) arranged on the bottom plate (1), a shaft (7), walls surrounding the base plate (1), a gear (6) rotatably connected to the shaft (7), and a first rack (4) and a second rack (5) at opposite ends of the gear (6); the wall includes a first side wall (2) and a second side wall (3), the first side wall (2) is provided with a groove (21), the second side wall (3) is provided with a through hole (31); an end portion of the first rack (4) is provided with a shutter button (41) located in the through hole (31); an end portion of the second rack (5) is provided with an elbow (51) located in the groove (21); the second rack (5) is arranged in parallel with the first rack (4). When the shutter button (41) is pressed, the elbow (51) moves upward together with the second rack (5) and presses the volume button for driving the photography.

Disclosed are an adaptor lens for increasing a magnification of a scope and a sight comprising the same. The adaptor lens for increasing a magnification of a scope of the present invention comprises: an adapter lens body detachably coupled to a sight main body having an objective lens group; a convex lens part provided in the adapter lens body so as to be disposed in front of the objective lens group; and a concave lens part provided in the adapter lens body and disposed between the convex lens part and the objective lens group.

Disclosed are an adaptor lens for increasing a magnification of a scope and a sight comprising the same. The adaptor lens for increasing a magnification of a scope of the present invention comprises: an adapter lens body detachably coupled to a sight main body having an objective lens group; a convex lens part provided in the adapter lens body so as to be disposed in front of the objective lens group; and a concave lens part provided in the adapter lens body and disposed between the convex lens part and the objective lens group.

An apparatus and a method for powder bed fusion additive manufacturing involve a multiple-chamber design achieving a high efficiency and throughput. The multiple-chamber design features concurrent printing of one or more print jobs inside one or more build chambers, side removals of printed objects from build chambers allowing quick exchanges of powdered materials, and capabilities of elevated process temperature controls of build chambers and post processing heat treatments of printed objects. The multiple-chamber design also includes a height-adjustable optical assembly in combination with a fixed build platform method suitable for large and heavy printed objects. A side removal mechanism of the build chambers of the apparatus improves handling and efficiency for printing large and heavy objects. Use of a wide range of sensors in the apparatus and by the method allows various feedback to improve quality, manufacturing throughput, and energy efficiency.

An apparatus and a method for powder bed fusion additive manufacturing involve a multiple-chamber design achieving a high efficiency and throughput. The multiple-chamber design features concurrent printing of one or more print jobs inside one or more build chambers, side removals of printed objects from build chambers allowing quick exchanges of powdered materials, and capabilities of elevated process temperature controls of build chambers and post processing heat treatments of printed objects. The multiple-chamber design also includes a height-adjustable optical assembly in combination with a fixed build platform method suitable for large and heavy printed objects. A side removal mechanism of the build chambers of the apparatus improves handling and efficiency for printing large and heavy objects. Use of a wide range of sensors in the apparatus and by the method allows various feedback to improve quality, manufacturing throughput, and energy efficiency.

A converter lens according to an exemplary embodiment of the present invention is a converter lens that has a negative refractive power and increases a focal length of an entire system. The converter lens includes a front group having a positive refractive power and a rear group having a negative refractive power, and the front group is a lens unit having a combined refractive power having a maximum positive refractive power in a case where the combined refractive power is obtained by combining a refractive power of each lens in order from the lens closest to an object toward an image side. At this time, a focal length of the front group, a focal length of the converter lens, and a lateral magnification of the converter lens when the converter lens is disposed on an image side of a master lens are determined as appropriate.

The present disclosure provides a projection apparatus. The projection apparatus includes: a light supply device, including an LED lamp and a collimator fly-eye lens, wherein lamp bodies of the LED lamp are arrayed and the LED lamp is capable of simultaneously emitting red, green, and blue light rays, and the collimator fly-eye lens is capable of collimating the light ray emitted by each of the lamp bodies; an optical path conversion device, configured to convert a direction of the light rays emitted by the light supply device; a DMD device, configured to process the light rays from the optical path conversion device and feed the processed light rays to the optical path conversion device; and a projection lens device; wherein the light rays transmitted by the optical path conversion device to the projection lens device to achieve image projection.

An external lens structure includes a lens assembly and a lens mount. The lens assembly includes a mirror chamber and a support seat disposed at a bottom of the mirror chamber. The lens assembly and the lens mount are two separate components, and the support base is rotatably connected with the lens mount, where the support seat is rotated relative to the lens mount. The lens assembly and the lens mount may be fixedly connected with the mounting body, and the lens assembly may be relatively rotated relative to the mounting body to ensure that the direction of the lens assembly may be rotated to the correct direction at all times to adapt to different models of mobile phones.

One example zoom lens group is disposed on an object side of an imaging lens group along a direction of an optical axis. The example zoom lens group includes an optical element and a drive element, and the drive element drives the optical element to move along a first direction, causing the optical element to cut into or move out of an optical path to implement zoom. The first direction is set at an included angle with the optical axis, and when the optical element cuts into the optical path, the optical element enlarges a field of view.