【 Weak current college 】 computer head light internal structure and working principle

Computer head light is a set of electronic, mechanical, optical high-tech products. Qualified computer head light, must be reliable and accurate positioning of fine, light, heat, light and materials and structures in line with the machine
Engineering requirements.

Computer head light size from the use of power can be divided into 250W, 575W, 1200W, etc. Which 1200W professional venues-the main lights. This article focuses on 1200W head light of the principles of
。 In summary, shaking her computer lamp is made of optical, mechanical, electrical and process control three systems. Three systems are interlinked, organic combination, meet the light, color, speed, direction, effects, heat, noise
Sound, positioning elements.

First, the optical system

The main optical system design consider the light flux utilization. Specific performance indicators including light intensity, evenness, saturation, spot size. Impact of the above indicators of elements has two parts: one is a light source,
The second is the optical system structure, materials selection. At present, domestic and foreign manufacturers, users, basic recommended PHILIPS1200W short arc OSRAM or double-end metal gas discharge lamp. Its characteristic is a compact, high brightness, high color temperature
, The color of good and light source in the Dim, able to maintain a relatively stable color temperature. The disadvantage is that this kind of lamp in the filler of hierarchical, i.e. filling agents in arc Imaging in ribbons or arc tube condensation,
Form the shadow effect, optical structure design time control to the minimum. In optical structure, for uniform mixing beam, use parabolic reflectors to acquisition of divergent or narrow beam, should choose
Scale processing or surface texture of the reflector. Use the specular material reflector system better than the refraction system. When you need from one source to get several beams, may use the prism or lens combination of refraction of
Marketing. At present, domestic and foreign 1200W shake optical design of computerized light, use the lens combination, made up of non-spherical (parabolic) quartz lenses, etc.

The most important characteristics of the reflector lens focus position a point light source, will be a parallel beam of light. In the optical path design time, you need to take into account the intensity distribution curves, shapes and light source dimensions, reflection lens diameter
The size and shape of the light source link between.

Second, the mechanical system

A wide range of mechanical systems, including materials, structural, mechanical, shell, thermal requirements etc. Material selection luminaire key considerations are: meet the lamp functionality requirements, ease of manufacture and the
JI. At present, international and domestic 1200W head light material mainly in steel, plastic, aluminum alloy. In considering the overall functionality of your needs, design lamp structure model, divided into different parts, with no
The same material. If Aceda-spot1200III1200W head light, lamp body shell made of plastic parts, light body supporting frames, base, side plates, side plates made of aluminum alloy castings, stampings and car parts.

Lamp structure determines its mechanical, thermal, strength, noise, weight, and other elements. International and domestic 1200W head light use arms supporting structure, the lamp horizontal rotation up to 540 °, tilt up to
255 °, base shall be strengthened, meet head light hanging upside-down.

The mechanical properties of the lamp, mainly reflected in the lamp body parts of mechanical strength, so that the lamp in a continuous and effective work time, non-deformation, wear resistance, corrosion resistance, earthquake resistance, compression; lamp shell must be strictly
Waterproof, dustproof, anti-static, moisture requirements. According to the dustproof, waterproof varying levels of classification of the different shell protection grade: such as indoor use computer lamp protection rating IP20, outdoor typically
Computer lamp protection requirements levels usually IP44.

1200W power PC light mechanical structure, thermal requirements is essential, the thermal system if there are defects, often causing the electrical parameters of the drift, film, movies, plaque rupture, resulting in a panic, out-of-step
And who are not under the control of, and other serious consequences.

Third, some electrical and process control

1, computer head light electrical characteristics and circuit design

Former worldwide professional 1200W shaking the vast majority of computer lamp with rare gas discharge bulb light source. Gas discharge bulb start and stable jobs depends on the type of circuit design, power, ballasts
And other electrical components. Noble gas discharge bulb starts, generally do not need stable time, to ensure more stability in the whole of the AC cycle, circuit of sustaining voltage and the lamp difference between instantaneous voltage should be
Sufficiently large.

Light source startup, stability, off, restarting, according to the characteristics of the light source requires the design of the circuit. Noble gas discharge bulb of start voltage is very high, requiring the use of transformers, boot device and semi-resonance electric
Road to enhance instant start voltage. The stability of the light source after starting, depending on the ballast and the matching circuit parameters. The basic functionality of the ballast was to prevent runaway and the light of current in the electrical characteristics of its normal
The following work. Current production enterprises typically uses two types of ballasts, and one is an inductively rectifier, is electronic rectifier. Inductance rectifier advantages are stability, the disadvantage is that the intensity of the light body, removal,
Handling all have higher requirements; electronic rectifier essentially power conversion circuits, will enter the frequency of the supply current, wave and amplitude changes. Its advantages are light weight, easy handling, handling; disadvantage
Is the structural design requirements, maintenance cost is high.

Light source and restart, in conventional circuit design, because the gas discharge bulb produces high temperature while you work, so that the formation of gas bubble saturation vapour pressure resistance, the light source to immediately triggered it is very difficult to achieve, you must make light the gas
> Body pressure down to cold numbers, to trigger a reboot. At present, international and domestic production enterprise basic with conventional circuit design.

2. program control section

The current international and domestic PC lights widely used DMX data format to write the program file. The principle: DMX512 DMX data flow speed is 250K, that is, every BIT as standard 4 microseconds. DMX data format minutes
Into the following parts: 1) IDLE (idle) or NODMXsituation (): output when no DMX packet, it is a high level signal; 2) BREAK: DMX packet start is a micro-88
Seconds of the low level output forecast {header}; 3) MARKAFTERBREAK (MAB): MAB is after the BREAK, is a high level of 8 kHz or 2 pulses; 4) STARTCODE (SC) code: SC is the number of
According to the flow of channel data, it has the same format as the channel data, generally 11 pulse or 44 kHz; 5) MARKTIMEBETWEENFRAMES (MTBF): MTBF can be 0-1 seconds, less than 1 second
In the starting position of each channel are there before the MTBF, for high level; 6) CHANNELDATA (CD): channel data frame in a logical format after SC 1-512 or less than 512; 7) MARKTIMEBETWEEN
PACKETS (MTBP): in the valid data send finished sending high level.

Computer lamp effect produced by the different styling King, different color changes, different perspectives, horizontal, vertical light angle changes and speed, stroboscopic speed, Aperture, focal length, the size changes
Comprehensive performance changes. All of these properties work by indexes of stepping motor drive, the stepper motor electrical operation parameter to define programming, completes the PC light control.