RU191979U1 - PCB FOR LIGHTING THE END SURFACE OF THE FIBER GUIDE - Google Patents

Abstract

The utility model relates to semiconductor lighting technology, namely, lighting devices based on an end-illuminated optical fiber, which can be used for general or local lighting. The technical result is to improve the heat sink and simplify the positioning of the LEDs relative to the end surface of the fiber. The printed circuit board for illuminating the end surface of the fiber contains a flexible base in the form of a strip along which the LEDs are linearly mounted, the edges of the board are folded so that the profile of the board with bent edges has a U-shape, on the inner surface of the horizontal section of which the LEDs are placed. The edge of the board can be equipped with transverse slots oriented between adjacent LEDs and dividing the edge of the board into separate elements moving in the transverse direction. 2 s.p. f-ly, 7 ill.

Description

Technical field

The utility model relates to semiconductor lighting technology, namely, lighting devices based on a fiber, which can be used for general or local lighting.

Known level

In the manufacture of printed circuit boards for illuminators with end lighting of optical fibers, especially complex (for example, cylindrical, etc.) shapes, it is necessary that the printed circuit board with LEDs repeats the relief of the end of the optical fiber.

With significant dimensions, and today the diameter of pipes made of polycarbonate or PMMA reaches 1 m, the manufacture of circuit boards is difficult because of the need to place LEDs mounted on a printed circuit board over the entire end surface, while the waste material of printed circuit boards increases, which increases the cost of the finished product, except of this, when creating powerful illuminators, the problem of overheating of LEDs arises, if the surface area of the printed circuit board is insufficient for cooling, and an additional cooling radiator is undesirable n, or uncomfortable place.

Known flat lighting device containing a planar fiber, in the frame of which there is a linear board with LEDs directed at the end of the planar fiber. In this case, the positioning of the LEDs relative to the end of the fiber is achieved using the framing elements of the planar fiber (KR 1020130015624 B1, IPC F21S 2/00, published 04.12.2013).

A disadvantage of the known solution is the indirect positioning of the LEDs relative to the end surface and the limited ability to remove heat from the LEDs that occurs due to the placement of the board in the closed volume of the holder, which limits the use of more powerful LEDs.

A double-sided printed circuit board is known, on the front side of which there are LEDs mounted on the sides of the printed circuit board using hard leads (US 20020149933 Al, F21V 33/00, published October 17, 2002).

As the closest analogue, the patent KR 1020130015624 was selected, which coincides with the claimed solution for most essential features.

The technical result is to improve the heat sink and simplify the positioning of the LEDs relative to the end surface of the fiber.

Utility Model Disclosure

The printed circuit board for illuminating the end surface of the fiber contains a flexible base in the form of a strip along which the LEDs are linearly mounted, the edges of the board are folded so that the profile of the board with curved edges has a U-shape, on the inner surface of the horizontal section of which the LEDs are placed.

The bent edges of the board can not only position the LEDs relative to the end surface of the fiber, but also fix the board on the surface of the fiber, as well as ensure the removal of excess heat from the LEDs. The dimensions of the foldable edge may vary depending on the power of the LEDs.

At least one of the edges of the board may be provided with transverse slots oriented between adjacent LEDs, but not crossing the board. Slots divide the edge of the board into separate laterally movable elements, each of which has the ability to bend, and all together reliably position the position of the board on the end surface of the fiber.

To expand the capabilities of the board may have oncoming transverse slots at both edges. In this embodiment, the slots cannot cross the LED line.

A flexible printed circuit board can have an aluminum or polyamide base, which allows, due to plastic deformation of the edges of the board, to fix its position on the end surface of the fiber.

The mounting surface of the printed circuit board can be equipped with SMT components whose height above the mounting surface is higher than the height of the LEDs, which eliminates damage to the LEDs when the board is installed on the end surface of the fiber.

The planar fiber can have an external end surface and / or an internal end surface formed by the wall of a through hole made in the planar fiber. LEDs are linearly mounted on the board and are located along the end surface of the fiber.

In the case of the use of optical fibers whose end surface has curvature, portions of the board adjacent to such an end surface are provided with transverse cuts that allow bending portions of the board to the surface of the fiber. For flat end surfaces, transverse cuts are not necessary.

A cylindrical fiber can have cylindrical diffeomorphic surfaces and have an end surface on its both bases. LEDs linearly mounted on a flexible board are located along the entire surface of the end face, while portions of the board adjacent to the LED placement area are provided with cuts and bent to the inner and / or outer cylindrical surface of the light guide.

Brief Description of the Drawings

In FIG. 1 shows a fragment of a board with cuts at an angle cp between portions of the board designed to be placed on concave, convex and linear end surfaces of the fiber,

in FIG. 2 is a three-dimensional image of a printed circuit board configured to be mounted on a convex end surface of a planar fiber, FIG. 3 is a three-dimensional image of a planar fiber with a configured configured board shown in figure 2,

in FIG. 4 shows a three-dimensional image of the board in the form in which it is located on the inner end surface of the planar fiber,

in FIG. 5 shows a three-dimensional image of the LED board shown in FIG. 4 and mounted on the inner concave end face of the planar fiber.

in FIG. 6 shows a three-dimensional image of a fiber with a board located on the end surface of a cylindrical fiber.

In fig. 7 shows a three-dimensional image of a fragment of a planar fiber with a LED board without cross sections installed along the flat end surface of a planar fiber.

In the drawings, device elements are indicated by the following positions:

1 - LEDs

2 - sections of the board configured for bending,

3 - the outer surface of the LED board,

4 - planar fiber

5 - the outer end surface of the planar fiber in the form of a ring,

6 - a cylindrical fiber,

Description of the utility model

All options are applicable when using metal flexible boards, while the larger the area of the printed circuit board is on the LED, the greater the power dissipated by the printed circuit board.

In modern products using LEDs, in order to achieve high efficiency, they use currents corresponding to 0.15 ... 0.18 W per 0.5 W LED, which means that 0.07 ... 0.09 W should be dissipated, and if you accept Since 10 cm ^{2 of} the board's area is enough for 1 W of the LED, then 1 cm ² for the LED is enough to dissipate the given power.

Sections 2 of the printed circuit board, which are bent to the surface of the fiber 4, 6, in addition to positioning the board 3 also perform the function of a radiator and a reflector.

A printed circuit board equipped with LEDs 1 mounted on its surface is bent so that the board acquires a U-shaped profile, and LEDs 1 are located in the depth of the U-shaped profile and illuminate the end surface of the fiber.

To exclude the contact of the fiber with the LEDs and to exclude the possibility of damage, an adjacent component is installed between adjacent LEDs, the height of which is greater than the height of the LEDs by 0.2 ... 0.8 mm.

Since it is possible for planar and cylindrical optical fibers to exit light through slots in the circuit board, a silicone or other opaque shell can be installed on top to reflect the light flux and protect the printed circuit board.

Claims (4)

1. A printed circuit board for lighting the end surface of the fiber, containing: a flexible base in the form of a strip along which the LEDs are linearly mounted, the edges of the board are bent so that the profile of the board with bent edges has a U-shape, on the inner surface of the horizontal section of which the LEDs are placed. 2. A printed circuit board according to claim 1, characterized in that the edge of the board is provided with transverse slots oriented between adjacent LEDs and dividing the edge of the board into separate transversally movable elements. 3. The printed circuit board according to claim 1, characterized in that the flexible printed circuit board has an aluminum or polyamide base, which allows, due to plastic deformation of the board sections adjacent to the LED placement area, to fix the position of the board on the end surface of the fiber.

Images