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 fifth lens, and a sixth lens. The first lens has refractive power and includes a convex surface facing an object side. The second lens has positive refractive power. 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 and includes a convex surface facing the object side. The lens assembly satisfies the following condition: 0.2<|f5/f|<1.5; wherein f5 is an effective focal length of the fifth lens and f is an effective focal length of the lens assembly.

Abstract: A range finder includes a prism module and a prism adjusting mechanism. The prism module includes a fixing prism group and a movable prism group, wherein the fixing prism group is adjacent to the movable prism group. The prism adjusting mechanism includes a first adjusting group and a second adjusting group, wherein the first adjusting group includes a first adjusting member and a second adjusting member, and the second adjusting group includes a third adjusting member. The first adjusting member or the second adjusting member is rotated to axially move so that the movable prism group is rotated with respect to the fixing prism group about a first axis, the third adjusting member is rotated to axially move so that the movable prism group is rotated with respect to the fixing prism group about a second axis, and the first axis is perpendicular to the second axis.

Abstract: A docking device for connecting an electronic device includes a base and a connector. The connector has a body and a connecting port on the base. The body is provided on the base to be moved between a first position and a second position. The connecting port is hidden in the base when the body is moved to the first position, and the connecting is exposed to connect the electronic device when the body is moved to the second position. The docking device may be incorporated in a portable projector.

Abstract: An image contrast evaluation method is disclosed. First, focusing is performed based on the contrast value of an image rendered by a lens on optical sensors, wherein the calculation of the contrast value comprises: selecting an area of the image, calculating the absolute value of brightness difference between each neighboring pixel, and selecting a specific value there from as the contrast value of the image based on a distribution of the calculated absolute values of the brightness differences.

Abstract: An image sensor module including a base, an image sensing unit, a filter, and at least an exhaust unit is disclosed. The base has a first binding plate which is opposite to a second binding plate, and a space, wherein both of the first and the second binding plates are vertical to an optical axis. The image sensor unit and the filter respectively bind to the first and the second binding plates. The exhaust unit binding to the second plate has a first exhaust entrance connecting to the space, an exhaust outlet connecting to the outside, and an exhaust path connecting to the first exhaust entrance.

Abstract: A lens retraction mechanism slantways retracts a lens from a shooting position to a receiving space. The lens retraction mechanism includes a base body, which includes a substrate, a guide wall disposed on the substrate and the receiving space, a lens guiding frame moveable with respect to the base body in the direction of an optical axis of the lens group, a pair of guiding shafts having one end fixed to the guiding frame, and a lens holding frame that fixes a lens group and includes a pair of slippage portions moveable with respect to the guide wall. When the lens retracts, the guiding frame draws the guiding shaft to move towards the substrate in the direction of the optical axis, and the lens holding frame moves along the guide means and also along the guiding shaft, and finally falls into the receiving space. The lens retraction mechanism retracts the lens group stably and securely.

Abstract: A high precision molding device for insert-molding optical lens comprises a stationary sub-mould and a movable sub-mould for engaging with the stationary sub-mould thereby forming a mould cavity therebetween for molding an optical lens. The molded lens has a body and a protection ring extending outside from the body, and is separated from the stationary sub-mould together with the movable sub-mould. The movable sub-mould includes a mould base, a core fixed with the mould base and a pushing means for pushing the molded lens off the movable sub-mould. The pushing means is circumferentially positioned at the mould base. The upper and bottom surfaces of the protection ring of the molded lens form textures to be foggy.

Abstract: A stepping motor includes a rotor including a cylindrical permanent magnet, ring-shaped first and second yoke units that are arranged so as to be mutually stacked along an axis of the rotor, electrical connection members of resin material that include external connection terminals and are respectively secured to the first and second yoke units, and a pair of lid members that enclose the first and second yoke units from both sides thereof and support the rotor so as to be rotatable around the axis.

Abstract: A stepping motor includes a rotor having a cylindrical permanent magnet, ring-shaped first and second yoke units that are arranged so as to be mutually stacked along an axis of the rotor, and a pair of lid members that enclose the first and second yoke units and support the rotor so as to be rotatable around the axis. Each of the first and second yoke units includes a ring-shaped exciting coil, an outer yoke that includes an outer cylindrical section that accommodates therein the exciting coil, a back face section, and magnetic pole teeth, and an inner yoke that is combined with the outer yoke and includes a ring-shaped ring section formed around the axis, and magnetic pole teeth that are arranged at fixed intervals while alternating at equal intervals in a noncontacting state with respect to the magnetic pole teeth of the outer yoke. The first and second yoke units are stacked while the back face sections thereof are in a mutual surface contact state.

Abstract: A high power driver system has a predetermined number of driver modules for driving a high power device such as a laser-emitting device. Each driver module has a driver circuit and a corresponding feedback circuit. The driver circuits respectively generate driving currents, and then the driving currents are collected to drive the high power laser-emitting device or other high power devices. In addition, these feedback circuits of the driver modules receive the same detection signal that represents the output power of the high power laser-emitting device. Then, each feedback circuit responds to the same detection signal to generate a feedback signal, respectively, which makes the corresponding driver circuit carry out a feedback action for adjusting the driving currents.

Abstract: A driving device for a scanner includes an elongate guiding unit mounted in a base and disposed under an image sensor carriage that extends in a first direction, extending along a second direction transverse to the first direction, and having first and second side rail surfaces transverse to a top rail surface. A roller unit is mounted rotatably on a bottom side of the image sensor carriage, and includes a first roller rotatable about a first axis parallel to the first direction and disposed to roll along the top rail surface, and a second roller rotatable about a second axis transverse to the first and second directions and disposed to roll along the first side rail surface. A spring-loaded retaining unit is mounted on the image sensor carriage, and is disposed to contact rotatablely the second side rail surface. A driving unit drives the image sensor carriage to move in the second direction in the base.

Abstract: An adjusting apparatus for a telescopic system includes a base unit, a rotating unit, a resilient member, and an adjusting member. The base unit includes a top wall, a bottom wall, and a surrounding wall, among which an accommodating space is defined. The rotating unit is disposed on the base unit. The resilient member is disposed between and abuts against a positioning section of the rotating unit and one of the top and bottom walls of the base unit so as to bias the positioning section to press against the other of the top and bottom walls, and has at least two circumferentially spaced-apart first contacting portions contacting the positioning section. The adjusting member is mounted threadably on the positioning section. When the rotating unit is rotated, the adjusting member moves axially relative to the base unit.

Abstract: A clock down sensor mainly comprises a converter and a low-pass filter. The converter is used to convert an input signal from a PECL (Positive Emitter Coupling Logic) signal to a TTL (Transistor Transistor Logic) signal, the low pass filter is used to obtain a DC (Direct Current) level of the TTL signal. Thereby, the sensor can judge whether the clock signal is terminated according to the potential of the output signal in order to emit a warning so that a breakdown elimination inquiry can be done or automatic breakdown elimination can be processed earlier.

Abstract: A clock down sensor mainly comprises a converter and a low-pass filter. The converter is used to convert an input signal from a PECL (Positive Emitter Coupling Logic) signal to a TTL (Transistor Transistor Logic) signal, the low pass filter is used to obtain a DC (Direct Current) level of the TTL signal. Thereby, the sensor can judge whether the clock signal is terminated according to the potential of the output signal in order to emit a warning so that a breakdown elimination inquiry can be done or automatic breakdown elimination can be processed earlier.

Abstract: A binoculars for capturing images includes two optical systems and a image-capturing device installed in one optical system. The optical system having the image-capturing device includes a beam-splitting element, and the beam-splitting element divides a beam into two beams, wherein one beam is received by eye and another beam is received by the image-capturing device simultaneously. Consequently, the image-capturing device takes photos through the optical system of the binoculars.

Abstract: Laser range finder capable of lowering the noise/signal ratio of received laser radiation, composed of: a telescope; a laser transmitter; a transmission system; a receiving system; and a laser sensor, wherein the receiving area of the laser sensor is larger than the laser transmitter, and the focal length of the receiving system is longer than that of the transmission system, so that the image of the laser transmitter formed on the laser receiver is larger than the laser transmitter.

Abstract: Measuring method and device providing a traveling path of light beam. The traveling path includes a front portion between a target and a prism unit, a refraction portion entering the prism unit and extending inside the prism unit and a first and a second rear portions positioned outside the prism unit and corresponding to the front portion. A visible light beam and an invisible light beam at the same time travel along the front portion. The visible light beam comes from the surface of the target while the invisible light beam is a laser beam coming from a laser transmitter. The laser beam travels along the same path as the visible light beam to reach the surface of the target. Therefore, very long parts of the traveling paths of the visible light beam and the invisible light beam coincide with each other and are commonly directed to a specific portion of the target.