Projector cooling principle and its maintenance should pay attention to the problems - projector cooling principle, the projector maintenance - office

Now Projector Has gradually entered the education, family and other aspects of social life, especially in the field of education and teaching. As the teaching of modern teaching equipment necessary one, especially projector LCD projector, is the major, secondary and primary media play an important role in teaching. As a multimedia classroom equipment managers must know to understand the related projector technology, principle and its maintenance should pay attention to some problems. LCD projectors for our school arising from the use projector lamp usage time is too short (800 hours, 2,000 hours normal) turnover and other issues, this article introduces the principles of this area and use the accumulated some experience.

One, the projector cooling principle LCD digital projectors use liquid crystal imaging technique, amplified through the optical system to achieve high-resolution large screen display. In the projector part of the structure of the optical imaging shows the core of the liquid crystal panel in which light bulb and its vicinity optical devices are easy to produce heat and heat damage to the main components. LCD projectors, projection imaging requirements of high intensity light output, but the device small, the heat concentration, 75% of the projector power is dissipated only in a fist-sized space. If the temperature is too high, the inner wall of the quartz light bulb in the high temperature loss occurs through the phenomenon, resulting in white spots. Because of their large block of light through the office, leading to abnormal temperature rise of local area, causing further loss through the region, so that the rapid decay of brightness, and is likely to lead to lamp explosion. The light bulb through the optical system, converged on the LCD panel, even after the UV / IR coating, cold-filtered infrared reflector and other measures, there is still a lot of power concentrated in the LCD panels, polarizers and other small area of the device. Core component of liquid crystal projectors, LCD panels the physical nature of their work that it does not allow the temperature is too high. Other optical components, once the temperature exceeds its tolerance level will also cause damage to optical components, such as liquid crystal in the vicinity of the polarizers will occur at higher temperature fade bias and so on.

Addition to other optical systems, projectors, switching power supply is also an important heat source. Switching power supply commitment to the projection part of the Electrical and Mechanical Road, electricity and a light bulb powered task. As the ratio of pulse width modulation using the method of step-down and regulation, stable power, the power switch and transformer are working at higher frequencies, switching losses generated by the temperature rise. As the supply small, therefore heat source. If the power supply temperature is too high will lead to dry electrolytic capacitor, the power switch burned.

As the projector itself is to produce a lot of energy, but also a lot of heat sensitive components. Therefore, in order to ensure the safe use of projectors, cooling and high temperature thermal protection for all projectors must be considered a design requirement. LCD projector in their internal fan group to the core of the projector and the main heat source for thermal power, etc., while in order to ensure the life of the projector, the projector's temperature sensor installed inside real-time monitoring the temperature inside the projector, and feedback to the processing circuit. Projector work, the role of the cooling fan, the internal in a thermal equilibrium. This state is associated with the outside temperature when the outside temperature exceeds a certain temperature (35-36 degrees most of), the internal temperature will be important parts of the standard exceed its rating. Important part has its own cooling temperature sensor, such as liquid crystal near the top of the bulb, the power of the radiator on the work of the region once the temperature reaches the critical point, the projector's internal protection program will start automatically turn off the projector. This is the projector's cooling system and high-temperature thermal protection of the basic working principle. This feature ensures maximum service life of the projector.

2, routine maintenance should be noted that some of the key issues Projector is a precision electronic products, which combines mechanical, LCD or DMD, electronic circuit technology, and therefore the use from the following aspects of attention (to LCD projector for example):

(1) mechanical aspects: prevent the strong collision, compression and vibration. Because of strong earthquakes can cause the displacement of liquid crystal film, when the three LCD showing effects of convergence, there is not overlap phenomenon RGB color, while the optical system lens, mirror deformation or damage will affect the image projection , and zoom in orbit would impact damage caused by the lens stuck, or even rupture of the lens can not be used.

(2) Optical system: Note use of the environment of dust and ventilation cooling.

We are using polysilicon LCD panels generally only 1.3 inches, or even only 0.9 inches, while the resolution reached 1024X768 or 800X600, means that each pixel is only 0.02mm, the dust particles enough to stop it.

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