Abstract: A focal length adjustment mechanism, adapted for adjusting a focal length adjustment device located in a housing of a projector. The focal length adjustment mechanism includes a knob and a first stroke adjustment member. The first stroke adjustment member is located in the housing and includes a first end and a second end opposite to each other and a first pivot located between the first end and the second end. The first end is connected to the focal length adjustment device. The knob is connected to the second end. The knob rotates to drive the first stroke adjustment member to rotate around the first pivot. A distance between the first pivot and the first end is less than a distance between the first pivot and the second end, such that a movement path of the first end is less than a movement path of the second end.

Abstract: A light sensor includes an optoelectronic device and a light guide element. The light guide element has a first light incident surface and a light exit surface, so as to allow an incident light to enter the light guide element from the first light incident surface and then exit to the optoelectronic device from the light exit surface; wherein at least one of the light incident surface and the light exit surface has a single curved surface.

Abstract: An calibration kit includes a base, a combination of calibration parts, and a manipulation part. The combination of calibration parts is disposed on the base and includes a first calibration part and a second calibration part. The first calibration part has a first calibration surface. The second calibration part has a second calibration surface. The first calibration part and the second calibration part are relatively movable in a movement direction and are movable relative to the base. The manipulation part is movably or rotatably disposed on the base. The manipulation part is configured to be operable to drive the first calibration part and the second calibration part to move in the movement direction relative to the base, so that the combination of calibration parts forms a three-dimensional calibration surface configuration through the first calibration surface and the second calibration surface.

Abstract: A projector includes a casing, a lens, a bracket, a support member, a first spacer and a first fixing member. The lens is connected to the casing. The bracket is connected to the casing and has a through hole formed thereon. The support member is inserted into the through hole and abuts against the lens. The first spacer is disposed on the support member and has a first curved surface and the first curved surface faces the through hole. The first fixing member is disposed on the support member and pushes the first spacer towards the bracket, such that the first curved surface contacts a periphery of the through hole.

Abstract: An electronic device includes a casing, a circuit board, an electronic component and a fixing member. The casing includes a fixing pillar and at least one rib. The rib is connected to a periphery of the fixing pillar. The circuit board includes a through hole. The fixing pillar is disposed in the through hole. The circuit board abuts against a second top surface of the rib. A thickness of the circuit board is smaller than a height between a first top surface of the fixing pillar and the second top surface of the rib. The electronic component includes a first metal member. A first ground end of the first metal member is disposed on the first top surface of the fixing pillar. A gap exists between the first ground end and the circuit board. The fixing member fixes the first ground end to the fixing pillar.

Abstract: A speaker module includes a bracket, a plurality of first cushion members, a speaker and a plurality of second cushion members. The bracket includes a plurality of first pillars. Each of the first cushion members is disposed on one of the first pillars. The speaker is connected to the first cushion members. The second cushion members are connected to a periphery of the bracket.

Abstract: A projector includes a casing, a lens, a bracket, a support member, a first spacer and a first fixing member. The lens is connected to the casing. The bracket is connected to the casing and has a through hole formed thereon. The support member is inserted into the through hole and abuts against the lens. The first spacer is disposed on the support member and has a first curved surface and the first curved surface faces the through hole. The first fixing member is disposed on the support member and pushes the first spacer towards the bracket, such that the first curved surface contacts a periphery of the through hole.

Abstract: A speaker module includes a bracket, a plurality of first cushion members, a speaker and a plurality of second cushion members. The bracket includes a plurality of first pillars. Each of the first cushion members is disposed on one of the first pillars. The speaker is connected to the first cushion members. The second cushion members are connected to a periphery of the bracket.

Abstract: A projector being operated at a working surface is provided. The projector includes a casing, a light source module and a transparent blocking member. The casing has a first surface and a second surface. The first surface is adjacent to the working surface and opposite to the second surface. The second surface has an opening. The light source module corresponding to the opening is disposed in the casing. The light source module can be assembled and disassembled through the opening. The transparent blocking member is disposed on the second surface and covers the opening.

Abstract: An optical sensing apparatus with anti-dust structure, for sensing a rotation device which has a rotation surface rotating along a rotation direction, includes a base, an optical sensor, and a stop block. The stop block is located beside the optical sensor and disposed with the optical sensor on the base in accordance with the order of the rotation direction. A distance between a stagnation surface of the stop block and the rotation surface is shorter than a distance between a sensing surface of the optical apparatus and the rotation surface. When an air flow passes between the stagnation surface and the rotation surface, dust within the air flow could be partially deposited on the stagnation surface so as to reduce the deposition amount of the dust on the sensing surface. A filter apparatus with the optical sensing apparatus and a projector with the filter apparatus are also disclosed.

Abstract: The invention discloses a cover and an electronic apparatus with the cover. The cover is used for covering an opening of a casing of the electronic apparatus. The cover of the invention includes a covering body and a catching structure. Therein the covering body has an inner surface. When the opening is covered with the cover, the inner surface is toward the interior of the casing. The catching structure is formed on the inner surface for catching an object falling on the inner surface. The catching structure could be an adhesive layer or include a protrusive structure. If the catching structure is an adhesive layer, the object falling on the inner surface adheres to the adhesive layer. If the catching structure includes the protrusive structure, the object is confined by the protrusive structure.

Abstract: An optical sensing apparatus with anti-dust structure, for sensing a rotation device which has a rotation surface rotating along a rotation direction, includes a base, an optical sensor, and a stop block. The stop block is located beside the optical sensor and disposed with the optical sensor on the base in accordance with the order of the rotation direction. A distance between a stagnation surface of the stop block and the rotation surface is shorter than a distance between a sensing surface of the optical apparatus and the rotation surface. When an air flow passes between the stagnation surface and the rotation surface, dust within the air flow could be partially deposited on the stagnation surface so as to reduce the deposition amount of the dust on the sensing surface. A filter apparatus with the optical sensing apparatus and a projector with the filter apparatus are also disclosed.

Abstract: The invention discloses a method for igniting a lamp of a projector. The method includes steps of: (a) sensing a first temperature difference in response to power-off of the projector; (b) in response to power-on of the projector, detecting an aftercooling time and judging whether it is smaller than a predetermined cooling time, if YES, perform step (c); otherwise, perform step (g); (c) sensing a second temperature difference; (d) judging whether a ratio of the second temperature difference to the first temperature difference is larger than a threshold, if YES, perform step (e); otherwise, perform step (g); (e) calculating a re-cooling time; (f) controlling a fan to operate for the re-cooling time to cool the lamp down; and (g) igniting the lamp.

Abstract: A method for controlling a cooling device within a projecting system is provided. The cooling device cools the projecting system with a predetermined period after the illumination device of the projecting system is turned off. Then, after the projecting system is restarted, it is detected that whether the illumination device is lighted or not. As the illuminating device is not lighted, the predetermined period is extended.

Abstract: The invention discloses a cover and an electronic apparatus with the cover. The cover is used for covering an opening of a casing of the electronic apparatus. The cover of the invention includes a covering body and a catching structure. Therein the covering body has an inner surface. When the opening is covered with the cover, the inner surface is toward the interior of the casing. The catching structure is formed on the inner surface for catching an object falling on the inner surface. The catching structure could be an adhesive layer or include a protrusive structure. If the catching structure is an adhesive layer, the object falling on the inner surface adheres to the adhesive layer. If the catching structure includes the protrusive structure, the object is confined by the protrusive structure.

Abstract: A projector being operated at a working surface is provided. The projector includes a casing, a light source module and a transparent blocking member. The casing has a first surface and a second surface. The first surface is adjacent to the working surface and opposite to the second surface. The second surface has an opening. The light source module corresponding to the opening is disposed in the casing. The light source module can be assembled and disassembled through the opening. The transparent blocking member is disposed on the second surface and covers the opening.

Abstract: An air guiding structure is applied in a projecting device. The projecting device at least includes an optical element. The air guiding structure includes a first side wall and a second side wall. The first side wall having a first opening is disposed near a side of the optical element. The second side wall having a second opening is disposed near the other side of the optical element. Furthermore, the first side wall and the second side wall are connected to each other. The air is guided into the first opening, circulated through the optical element and is vented out via the second opening.

Abstract: A projecting system including a light source module, a flow-conducting member, and a blower is provided. The flow-conducting member includes a hollow body, and at least one part of the light source module is disposed in the body. The body has an inlet and an outlet. The blower is adjacent to the inlet and used for blowing a flow toward the inlet along a first direction. The flow will leave the outlet along a second direction different from the first direction. Utilizing the flow-conducting method and disposition for fans/blowers according to the invention, even if plural light sources are disposed adjacent to each other, the heat generated by the light sources can be effectively dissipated.

Abstract: The invention discloses a method for igniting a lamp of a projector. The method includes steps of: (a) sensing a first temperature difference in response to power-off of the projector; (b) in response to power-on of the projector, detecting an aftercooling time and judging whether it is smaller than a predetermined cooling time, if YES, perform step (c); otherwise, perform step (g); (c) sensing a second temperature difference; (d) judging whether a ratio of the second temperature difference to the first temperature difference is larger than a threshold, if YES, perform step (e); otherwise, perform step (g); (e) calculating a re-cooling time; (f) controlling a fan to operate for the re-cooling time to cool the lamp down; and (g) igniting the lamp.

Abstract: An electronic device includes a housing comprising a vent, and a filter installed nearby the vent. The filter includes a first filter section made of a first material, and a second filter section made of a second material. The first material has better uniformity than the second material. The electronic device further includes a light emitter for emitting a light signal to the first filter section, a light receiver for receiving the light signal emitted from the light emitter, and a control unit electrically connected to the light receiver for operating the electronic device according to a receiving result of the light signal received by the light receiver.