A kind of cob light source and its preparation process

Abstract

The invention discloses a COB (Chip On Board) light source and a preparation process thereof. The COB light source is characterized by comprising a heat dissipation substrate (1), wherein a plurality of LED (Light Emitting Diode) chips (2) are arranged on the heat dissipation substrate (1), a circle of enclosure (3) is arranged outside the plurality of LED chips (2), and the enclosure (3) is connected with the upper surface of the heat dissipation substrate (1); an electrode (7) is arranged inside the enclosure (3); the LED chips (2) are connected with the electrode (7) by a gold thread (8); a hemispherical cured silica gel (6) is wrapped outside the LED chips (2); and a layer of fluorescent powder (5) is uniformly deposited outside the hemispherical cured silica gel (6). According to the COB light source and the preparation process thereof, the fluorescent powder around the LED chips is distributed uniformly, so the light distribution in each direction is uniform; the process is simple, the cost is low, the emission angle is large, the lighting effect is high, the color temperature consistency of the light source is good, and the product quality consistency is good.

Description

technical field [0001] The invention relates to a COB light source and a preparation process thereof, belonging to the technical field of light source production. Background technique [0002] Most of the conventional phosphor precipitation processes are simply achieved by standing at room temperature or accelerating precipitation in a centrifuge. The phosphor precipitation effect is as follows: figure 1 As shown, only the upper surface of the light source chip and the upper surface of the copper substrate are deposited with phosphor powder, but there is no phosphor powder on the side wall of the LED chip, resulting in serious uneven light distribution of the light source chip. If it is left standing at normal temperature, it will take a long time and the production will be inconvenient; if the investment of the centrifuge equipment is large; both effects are not ideal. Contents of the invention [0003] The technical problem to be solved by the present invention is to pr...

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Problems solved by technology

[0002] Most of the conventional phosphor precipitation processes are simply achieved by standing at room temperature or accelerating precipitation in a centrifuge. The phosphor precipitation effect is as follows: figure 1 As shown, only the upper surface of the light source chip and the upper surface of the copper substrate are deposited with phosphor powder, while the side wall of the LED chip has no phosphor powder, resulting in serious uneven light distribution of the light source chip

If it is left standing at room temperature, it will take a long time and the production is inconvenient; if the centrifuge equipment is used, the investment will be large; the effect of both is not ideal

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