CN103515369A

CN103515369A - LED module substrate

Info

Publication number: CN103515369A
Application number: CN201310467056.3A
Authority: CN
Inventors: 王向展; 黄建国; 邹淅; 于奇; 欧文; 张衡明
Original assignee: University of Electronic Science and Technology of China
Current assignee: University of Electronic Science and Technology of China
Priority date: 2013-10-09
Filing date: 2013-10-09
Publication date: 2014-01-15
Anticipated expiration: 2033-10-09
Also published as: CN103515369B

Abstract

The invention provides a novel LED module substrate. The problems that an existing LED module is low in light-emitting efficiency, and substrate materials are high in price and high in weight are solved. The LED module substrate comprises a substrate body and LED chips arranged on the substrate. The LED module substrate is characterized in that concave grooves are formed in the center positions of blank places between the LED chips arranged on the substrate body. Preferably, the concave grooves are of a cup structure, and the lower surface of the structure is smaller than the upper surface of the structure, the structure is in a reversed cone shape or a reversed square pyramid shape, and the cross section is correspondingly in a circular shape or a square shape. According to the substrate, the concave grooves are formed in the center positions of the blank places between the LED chips, used materials of the substrate are effectively saved, production cost is lowered, the weight of the substrate is lowered, difficulty in an LED module assembling process is lowered, and meanwhile the concave grooves in the substrate are of the cup structure in which the lower surface is smaller than the upper surface, a reflecting cup is formed, LED module condensation effect can be enhanced, and light outgoing efficiency can be improved.

Description

A kind of LED module group substrates

Technical field

The present invention relates to the heat radiation of LED module and lighting technical field, particularly a kind of LED module group substrates.

Background technology

LED is a kind of novel semiconductor light-emitting light source, and LED has the particular advantages such as long service life, power consumption is few, the response time is fast.Along with the continuous maturation of LED manufacturing technology, the application of LED progressively enters into lighting field by original demonstration field, also more and more extensive in the application of lighting field.

Although LED has many merits, in the popularization and use of LED illumination, still there are a lot of obstacles, especially LED heat radiation and light extraction efficiency problem.Along with to the improving constantly of LED brightness requirement, driving LED just needs more electric energy.Yet the luminous efficiency of LED is still very low, the conversion efficiency of light only has 20%～30%, and wherein most of electric energy is converted to heat energy, thereby causes the temperature of LED chip to raise, and reduces useful life and the reliability of LED.For great power LED module, heat dissipation problem is particularly outstanding.In order to improve the radiating effect of great power LED module, the substrate of module generally select the material that thermal conductivity is higher (as aluminium, copper, diamonds etc.), but these material prices are more expensive, and weight is larger, in large-scale production, the problem that exists assembling difficulty and cost to raise.And because the lighting angle of LED chip is larger, easily in the packaging silicon rubber being covered on chip, there is total reflection, cause that spotlight effect is poor, light extraction efficiency declines.Consider above Liang Ge aspect, be therefore necessary to improve the structure of substrate.

Summary of the invention

The present invention is directed to the problems such as existing LED module luminous efficiency is low, baseplate material price is high, weight is large a kind of new LED module group substrates is provided, Baltimore groove is offered in this substrate blank space center between LED chip, save base board using material, alleviated substrate weight, Baltimore groove on substrate forms reflector simultaneously, strengthens LED module spotlight effect, improves light extraction efficiency.

A module group substrates, comprises substrate and is arranged on the LED chip on substrate, it is characterized in that, between the LED chip arranging on substrate, the center of blank space offers Baltimore groove.

Preferably, Baltimore groove is the cup-like structure that bottom surface is less than opening, is turbination or square taper, and it is circular or square that cross section should be mutually.When described LED chip is the straight rectangular arranged form of transverse and longitudinal, Baltimore groove is opened in the home position of adjacent every 4 LEDs tetragonal circumscribed circles that chip surrounds; When described LED chip is interlacing or during every the staggered rectangular in form of row, described Baltimore groove is opened in the home position of adjacent every 3 LEDs leg-of-mutton circumscribed circles that chip surrounds; When described LED chip is the form of circle arrangement, described Baltimore groove is opened in the position of intersecting point apart from the perpendicular bisector of air line distance between the equidistant circle of inside and outside two circle LED two LED chips adjacent with inner ring.

Preferably, 1/2 of the thickness that the Baltimore groove degree of depth is substrate; Inwall angle of inclination is 120 °～130 °; When described LED chip is the straight rectangular arranged form of transverse and longitudinal or interlacing or during every the staggered rectangular in form of row, it is circular or square that described Baltimore groove opening should be mutually, its diameter or the length of side are 3/4 of adjacent two row/column LED chip rectilineal intervals; When described LED chip is the form that circle arranges, it is circular or square that described Baltimore groove opening should be mutually, its diameter or the length of side be the difference of two adjacent rings LED radius of a circle deduct get after a LED chip length its 3/4.

Preferably, described Baltimore groove bottom surface and sidewall carry out polishing or silver-plated processing.

The invention provides a kind of LED module group substrates, Baltimore groove is offered in this substrate blank space center between LED chip, has effectively saved base board using material, has reduced production cost; Alleviate substrate weight, also reduced the difficulty in LED module assembling process; Simultaneously the Baltimore groove on substrate is the cup-like structure that lower surface is less than upper surface (Baltimore groove is turbination or square taper, be accordingly the radius of Baltimore groove bottom surface or radius or the length of side that the length of side is less than opening), form reflector, can strengthen LED module spotlight effect, improve light extraction efficiency.And the heat producing due to LED chip reduces with the increase of lateral separation gradually in its distribution on substrate around, finally tends towards stability; According to the known place large apart from chip lateral separation of the computational methods of thermal resistance, its thermal resistance is larger, less to the heat radiation contribution of substrate; Therefore for LED modular structure, on substrate, between LED chip, to offer Baltimore groove minimum on the heat dispersion impact of substrate in blank space center, by emulation experiment, relatively shows that LED chip maximum temperature in whole module, mean temperature excursion are no more than 1 ℃.

Accompanying drawing explanation

Fig. 1,3,4 arranges the schematic diagram of Baltimore groove for LED module group substrates of the present invention for the different spread patterns of LED chip on substrate.

Fig. 2 is the generalized section of the A-A ' of LED module group substrates shown in Fig. 1 line.

Fig. 5 is the schematic diagram of a Baltimore groove structure on LED module group substrates shown in Fig. 1.

Fig. 6 be shown in Fig. 1 on LED module group substrates Baltimore groove structure along the generalized section figure of B-B ' line.

Fig. 7 is the structure cutaway view that the present invention is applied to great power LED module; Wherein, 1 is packaging silicon rubber, and 2 is LED chip, and 3 is elargol, and 4 is Baltimore groove, and 5 is copper base, and 6 is bonding agent, and 7 is radiator.

Embodiment

By LED module group substrates of the present invention, for great power LED module, its structure as shown in Figure 7.Great power LED module is comprised of packaging silicon rubber 1, LED chip 2, elargol 3, LED module group substrates 5, bonding agent 6 and radiator 7, wherein LED module group substrates material adopts copper base, LED chip is bonded on LED module group substrates by elargol, packaging silicon rubber covers the upper surface of LED chip and LED module group substrates, and fill set Baltimore groove on substrate, LED module group substrates lower surface is fixed on fin slices radiator by bonding agent.

In great power LED module, there is different arrangements in the LED chip being arranged on substrate.

Preferred described Baltimore groove is the cup-like structure that bottom surface is less than opening, is turbination or square taper, and it is circular or square that cross section should be mutually.

Further polishing or silver-plated processing are carried out in Baltimore groove bottom surface and sidewall, strengthen Baltimore groove reflecting effect, improve LED module light extraction efficiency.

For LED chip, be the straight rectangular arranged form of transverse and longitudinal, as shown in Figure 1, with adjacent every 4 LEDs chip Wei Yige unit, Yi Gai unit surrounds the home position of tetragonal circumscribed circle and in substrate, offers Baltimore groove, Baltimore groove is the cup-like structure that bottom surface is less than opening, be turbination, it is circular that cross section should be mutually.For a Baltimore groove unit, as shown in Figure 5, profile as shown in Figure 6, preferred for vertical view, and setting Baltimore groove opening diameter D is 3/4 of adjacent two LED chip rectilineal intervals, and depth H is substrate thickness 1/2, and Baltimore groove inwall tilt angle alpha is 120 °.

For interlacing or every the staggered rectangular in form of row, as shown in Figure 3, Baltimore groove is set in the home position of adjacent every 3 LEDs leg-of-mutton circumscribed circles that chip surrounds.

The form of arranging for circle, as shown in Figure 4, arranges the position of intersecting point of Baltimore groove perpendicular bisector of air line distance between the equidistant circle of the inside and outside two circle LED of distance two LED chips adjacent with inner ring.

Claims

1. a LED module group substrates, comprises substrate and is arranged on the LED chip on substrate, and it is characterized in that, between the LED chip arranging on substrate, the center of blank space offers Baltimore groove.

2. by a kind of LED module group substrates claimed in claim 1, it is characterized in that described Baltimore groove is the cup-like structure that bottom surface is less than opening, be turbination or square taper, it is circular or square that cross section should be mutually.

3. by a kind of LED module group substrates claimed in claim 1, it is characterized in that described LED chip is the straight rectangular arranged form of transverse and longitudinal, Baltimore groove is opened in the home position of adjacent every 4 LEDs tetragonal circumscribed circles that chip surrounds.

4. by a kind of LED module group substrates claimed in claim 1, it is characterized in that described LED chip is interlacing or every the staggered rectangular in form of row, Baltimore groove is opened in the home position of adjacent every 3 LEDs leg-of-mutton circumscribed circles that chip surrounds.

5. by a kind of LED module group substrates claimed in claim 1, it is characterized in that described LED chip is the form that circle is arranged, Baltimore groove is opened in the position of intersecting point apart from the perpendicular bisector of air line distance between the equidistant circle of inside and outside two circle LED two LED chips adjacent with inner ring.

6. by a kind of LED module group substrates claimed in claim 1, it is characterized in that 1/2 of thickness that the described Baltimore groove degree of depth is substrate.

7. by a kind of LED module group substrates claimed in claim 1, it is characterized in that described Baltimore groove inwall angle of inclination is 120 °～130 °.

8. by a kind of LED module group substrates described in claim 3,4, it is characterized in that described Baltimore groove opening should be circular or square mutually, its diameter or the length of side are 3/4 of adjacent two row/column LED chip rectilineal intervals.

9. by a kind of LED module group substrates claimed in claim 5, it is characterized in that described Baltimore groove opening should be circular or square mutually, its diameter or the length of side be the difference of two adjacent rings LED radius of a circle deduct get after a LED chip length its 3/4.

10. by a kind of LED module group substrates claimed in claim 1, it is characterized in that described Baltimore groove bottom surface and sidewall carry out polishing or silver-plated processing.