Computer shake head lamp is a high-tech product, which integrates the electronic, mechanical and optical. Qualified computer shaking head lamp, must be stable and reliable, good light effect, accurate positioning, good heat dissipation, light body and material structure in line with ergonomic requirements.
Computer shake head lamp from the use of power can be divided into 575W, 1200W, 250W and other varieties. Where 1200W is the main type of professional performance venues. In this paper, we focus on the structural principle of 1200W head lamp. To sum up, the head of the computer is composed of optical, mechanical, electrical and program control three major systems. The three systems are interrelated and organic combination, which meet the needs of light, color, speed, direction, effect, heat dissipation, noise, positioning and other factors.
One, optical system
Optical system design of the main consideration of the utilization rate of light flux. Specific performance indicators include the intensity of light, uniformity, saturation, spot size. There are two factors affecting the above indicators, one is the light source, the two is the optical system structure, material selection. At present, the domestic and foreign manufacturers, users are basically recommended OSRAM or 1200W PHILIPS short arc double ended metal gas discharge lamp. Its features are compact, high brightness, high color temperature, color and a light source in the dimming process, can maintain a relatively stable temperature. Disadvantage is that the stratification of the lamp tube filler, filler in the imaging of arc appears ribbon, or in the arc tube condensation and formation of the shadow effect, in the structure design of optical control in minimum range. In the optical structure, a parabolic reflector is used to obtain a uniform beam, which can be used to gather the divergent or narrow beams, and a reflective mirror with a scale or a surface texture should be selected. The reflector system made of specular reflection is better than that of the system. When a light source is required to obtain a few beams, a prism or a lens combination of refraction system is used. At present, the optical design of the 1200W head lamp of the domestic and foreign, all the way of the combination of the lens, by the non spherical (that is, the parabolic) quartz lens and so on.
The most important feature of a parabolic lens is placed in the focal point of a point light source, will be a parallel beam. In the design of the optical path, the relationship between the intensity distribution curve, the shape and the size of the light source, the size of the aperture size and the shape of the light source are also considered.
Two, mechanical system
The mechanical system is very wide, including material, structure, mechanical properties, shell requirements, cooling requirements, etc.. Material selection of lamps and lanterns are mainly considered: the functional requirements of the lamp, the difficulty degree and the economy of manufacturing. At present, the international and domestic 1200W head lamps of the material mainly steel, plastic, aluminum alloy. In consideration of the overall function of the lamp, the structural model of the lamp is designed, which is divided into different parts and different materials. Such as Aceda-spot1200III1200W shaking his head lights, light body shell with plastic parts, lamp body support frame, a base, a side plate, an end plate adopts aluminum alloy casting, stamping parts, car parts.
The structure of the lamp determines its mechanical properties, heat dissipation, strength, noise, weight, and other factors. International and domestic 1200W head lamps are used to support the structure, the lamp body level of 540 degrees, vertical rotation of 255 degrees, the base part of the need to do to strengthen the processing, to meet the need to shake the head lamp hanging upside down.
The mechanical performance of the lamp body is mainly reflected in the mechanical strength of the lamp body parts, so that the lamp body is not deformed, wear resistance, corrosion resistance, anti – corrosion, anti – corrosion, anti – corrosion, anti – vibration, and anti – static and moisture proof requirements. According to the degree of dust and water, the extent of the different classification of different protection levels of the housing requirements: for example, the use of computer lights for the protection requirements of the level is usually IP20, outdoor computer lights of the protection requirements of IP44.
The mechanical structure of 1200W high power computer lamp, heat dissipation is very important, cooling system, such as defects, usually caused by electrical parameters drift, color, film rupture, the emergence of patches, resulting in death, loss, control, and other serious consequences.
Three, electrical and program control part
1, computer shake head lamp of electrical characteristics and circuit design
Former world wide professional 1200W shook his head computer lights, the vast majority of the use of rare gas discharge light source. The starting and stable operation of the gas discharge bubble depends on the design of the circuit type, the power supply and the ballast and other electrical components. Rare gas discharge lamp to start, generally do not need to stable time, in order to ensure the stabilization and in the AC cycle, circuit to maintain the difference between the instantaneous voltage of the voltage and lighting should be sufficiently large.
The starting of the light source, the stability, the extinction, and the start of the light source should be designed according to the characteristics of the light source. The starting voltage of the rare gas discharge bubble is very high, which requires the use of transformer, starting device, half resonance circuit, etc., to improve the instantaneous starting voltage. The stability of the light source is determined by the matching of the ballast and the circuit parameters. The basic function of the ballast is to prevent the current from being out of control and to work under the normal electrical characteristics of the light source. At present, the production enterprises usually adopt two kinds of ballast, one is the inductive rectifier, one is the electronic rectifier. The advantages of the inductive rectifier are good stability, the disadvantage is the weight, the intensity of the lamp body, handling, loading and unloading have higher requirements; electronic rectifier is essentially a power conversion circuit, the input current frequency, waveform and amplitude changes. Its advantage is light weight, convenient loading and unloading, handling; the disadvantage is the structure design requirements, high maintenance costs.