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: 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: An image forming apparatus includes a light source, an optical component, and a light-shielding device disposed between the light source and the optical component. The light-shielding device includes a first component and a second component. The first component includes a circular element and a frame. The first component has an aperture for allowing light emitted from the light source incident onto the optical component. At least one opening is formed in the frame. The second component is coupled to the first component and covers the opening.

Abstract: A velocity-profile modifying device is located between a heat component and an air pouring apparatus. The air pouring apparatus pours the air into the heat component via an air moving track. The velocity-profile modifying device is set at the air moving track and is used for modifying a first velocity-profile of airflow by the air pouring apparatus to a second velocity-profile and further for making the air distribute evenly toward the heat component. By providing the velocity profile modifying device, a better distribution of the airflow toward the heat component and a stable temperature status of the heat component can be achieved.

Abstract: The invention discloses an apparatus for actuating an object movably mounted on a slide rail. The apparatus includes a processing unit, a controlling unit, a driving unit, and a motor. The processing unit is used for receiving an input signal and outputting a command signal in response to the input signal. The controlling unit is coupled to the processing unit and used for selectively outputting three kinds of enabling signals. The driving unit is coupled to the controlling unit and used for selectively outputting three kinds of driving signals each of which has a respective duty cycle. The motor is coupled to the driving unit and operatively connected to the object. The motor is used for actuating the object moving along the slide rail in accordance with different driving signal. Accordingly, when the object is reversed from the original moving direction, the apparatus of the invention can also function well.

Abstract: A cooling module of a projector is provided. The cooling module is disposed in a housing. The projector includes several heat generating components and the housing has a first side and a second side. The cooling module includes a first cooling path, a second cooling path and a first fan. The second cooling path is adjacent to the first cooling path. Between the first cooling path and the second cooling path are several heat generating components. The first fan is disposed on the second side of the housing. The first fan leads part of the heat generated by the heat generating components to flow along the first cooling path and leads another part of the heat generated by the heat generating components to flow along the second cooling path.

Abstract: A projection optical system includes an illumination system, a first adjusting device for adjusting an aperture size of the illumination system, a projection lens, a second adjusting device for adjusting an aperture size of the projection lens, and a controller. According to a look-up table or a predetermined calculation equation, the controller is used for controlling the second adjusting device and the first adjusting device to synchronously adjust the aperture size of the projection lens and the aperture size of the illumination system.

Abstract: A layout structure of a printed circuit board includes a thermal device, a temperature sensing device and an opening. The temperature sensing device is for sensing the environmental temperature of the printed circuit board. The opening is located between the temperature sensing device and the thermal device for reducing the extent of heat propagated from the thermal device to the temperature sensing device.

Abstract: A motor vibration damping device includes several dampers and a connecting part. Each damper is disposed in a fixing hole of a mechanic fixing piece for reducing motor vibration energy transmitted to the mechanic fixing piece and the connecting part connects the dampers.

Abstract: A velocity-profile modifying device is located between a heat component and an air pouring apparatus. The air pouring apparatus pours the air into the heat component via an air moving track. The velocity-profile modifying device is set at the air moving track and is used for modifying a first velocity-profile of airflow by the air pouring apparatus to a second velocity-profile and further for making the air distribute evenly toward the heat component. By providing the velocity profile modifying device, a better distribution of the airflow toward the heat component and a stable temperature status of the heat component can be achieved.