Main parameters:

·Input voltage: 100-264VAC

·Rated power: 200W; 480W; 600W

·Maximum brightness: (DL-2410) > 300.000cd / ㎡; (DL-100) > 1100.000cd / ㎡

·Viewing range: fullscreen

·Screen size: 10 * 20cm (a); 10 * 30cm (b); 10 * 40cm (c)

·Dimming range: 5-100%

·Observable density: > 4.5D

·Surface temperature rise: < 18 ° C (continuous 24 hours under normal temperature)

·Control mode: Manual + foot switch

·Cooling mode: air cooling

·High uniformity: > 0.95

·Scattering coefficient: > 0.95

Development background:

The viewer is one of the important tools for film evaluation. According to the different requirements of users for film density, led viewing lamp will be put on the market with different specifications. However, with the needs of technical development, users have higher and higher requirements for the brightness and uniformity of the LED viewer. The requirements of International ISO-5580-1985 and national GB /T19802-2005 standards are as follows: (see the table below)

For the needs of some special users, the maximum screen area of LED film viewer should be 36cm * 43cm (14 * 17 inches), the film density > 4.0D, the screen output brightness must be greater than 100.000cd / m2 (100000 candelas), while for the LED film viewer with film density > 4.5D, the maximum screen area should reach 10cm * 40cm (4 * 16in), and the screen output brightness must be greater than 300.000cd/m2 (30 Wan candela) and users with higher requirements need to be LED viewer to observe the film blackness of more than 5.0D, In order to meet this requirement, the brightness output of LED viewer must reach 1,100,000 cd / ㎡ (1.1 million candelas). In order to make the LED viewer output such high brightness, and the screen area must be large enough, this is that there is no real test data in our domestic market to prove that its LED viewer can reach this level.

Improvement or innovation:

High brightness LED (light-emitting diode) is generally measured by luminous flux (lumen lm) for the unit of luminance output, which represents the sum of all the light emitted by the light-emitting body in unit time. According to the requirements of international and national standards, the screen brightness is measured by candela (light intensity cd / ㎡). The light intensity represents the luminous flux in the unit solid angle in a certain direction, plus / ㎡, it represents the luminous flux in the unit area of the unit solid angle.

According to the conversion formula of luminous flux and luminous intensity, if a LED viewer with a screen area of 10cm * 40cm and full-screen luminance output greater than 300.000cd/m2 (300000 candelas) is to be manufactured, there must be 48000 lumens (lm) luminance output LED (light-emitting diode) array. According to the data provided by the manufacturer of LED beads, the maximum luminance of a single 1W led bead is 100-140 (LM ）If the average value is 120 (lm), 400 unit 1W LED lamp beads are also needed, that is to say, the array needs 400W power consumption, and 400W LED lamp beads in this fixed area range, so the heat dissipation is a big problem. If the heat dissipation design is not ideal, it will seriously affect the service life of LED lamp beads and cause serious light failure, which is the design and manufacture of LED viewer As one of the key technologies, some products in the market do not fully master the key technology of heat dissipation and use temperature sensor switch as thermal protection. When the temperature of the LED viewer rises to a specific value, the viewer will automatically turn off. When the temperature of the viewer drops to a specific temperature, the viewer can start again. This design will shorten the LED (thermal power supply) The service life of photodiode, and seriously affect the use of users.

In order to minimize the brightness output loss of LED lamp beads, and the uniformity coefficient of the screen brightness is greater than 0.95, the uniformity of LED lamp beads array is another key technology. The research and selection of uniformity lamp plate materials, the accurate design of the distance between the lamp beads array, and the uniformity lamp plate are all related to the technical level of an efficient viewing lamp. When the brightness of the LED viewer is more than 300000 candela, its ultra-high brightness light passes through the film with high-density value. As long as a few seconds, its light will be absorbed and heated by the film, and the heat generated by the light will soon burn the film. This problem has been puzzling the design engineers of the viewer. However, engineers of Cassia intelligent technology have adopted innovative module junctions The structure design perfectly solves the design and manufacturing difficulties of all the above-led film viewers, and their design and manufacturing technologies have all obtained national patents. (Patent No.: ZL 2016 2 0651557.6; ZL 2016 2 0651584.3; ZL 2016 2 0651583.9; ZL 2016 2 0709826. X).

Typical applications:

Applicable to: aerospace, military enterprises, nuclear power industry, petrochemical pipeline, shipbuilding, pressure vessels, and other units that need radiographic testing.

Honorary users:

At present, the products are mainly for export. (British, French, German, American, Canadian)

R & D and manufacturer: Wenzhou Cassia Intelligent Technology Co., Ltd