JPH0628725Y2 - Lens for LED lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a lens of an LED (light emitting diode) lamp used in a vehicle lamp, a display device, or the like.

[Conventional technology]

A conventional LED lamp has, for example, a dome-shaped contour as shown in FIG. 4, and an LED 2 is inserted into a cap 1 provided with an LED mounting hole 1A at its central axis portion to effectively emit light rays. I try to use it. That is, LED
The light emitted from the side surface of 2 is reflected by the side surface of the cap 1 to be a parallel light beam, which travels forward.

[Problems to be solved by the invention]

However, in such a structure, the light emitted from the insertion hole 1A portion on the front surface of the LED 2 is not parallel to the reference axis and spreads radially or is reflected on the front surface and reflected from the side surface of the cap 1. It goes out and becomes an ineffective ray ₁ .

[Means for solving problems]

In the present invention, the central part of the bottom cut surface of the parabolic rotating body is the LED.
It has a mounting position for the chip, and has a substantially hemispherical recess centered at the LED chip mounting position on the cut surface, while a convex part for the first-order refraction is formed on the front face, with the front being convex. It has a ring-shaped groove as described above, and the front surface outside the groove is formed of a transparent resin in a planar shape.

〔Example〕

FIG. 1 and FIG. 2 show an embodiment of the present invention, which is a bottom (origin side) cut surface 11 of a parabolic rotator-shaped lens body 10.
Is the mounting surface of the LED chip, and its center is the chip position.
12 The bottom cut surface of the main body 10 is a surface including the focus position, and a substantially hemispherical recess 13 centered on the chip position 12 is provided on the cut surface. Also, the cut surface has a mini mold L
Convex portion 14 for positioning when mounting ED, etc.
Are integrally molded.

On the other hand, on the front surface (upper surface in FIG. 1) of the main body 10, a ring-shaped groove 16 is formed so that a convex portion 15 for the first-order refraction having a convex front is formed at the center thereof. . In that case, the tip of the convex portion 15 is made to slightly project from the outer peripheral portion of the groove 16.

The lens having the above shape is obtained by molding a transparent resin such as an epoxy resin.

With such a shape, as shown in FIG. 1, the light rays radially emitted from the chip position 12 are incident on the lens body 10 on the outside, and then are reflected by the side surfaces to become substantially parallel light rays forward. After proceeding, the central part enters the lens,
The light is refracted at the convex portion 15 to become a substantially parallel light beam, which goes out to the front. That is, almost all emitted light rays are effective light rays.

FIG. 3 shows an LED lamp in which the lens of the above-mentioned embodiment is combined with the mini-mold LED 20, the epoxy resin 21 having the same refractive index as the lens 10 is poured into the concave portion 13 of the lens 10, and the mini-mold LED 20 is attached to the mounting surface 11. It is integrated by performing a heat curing process.

With such a structure, an efficient single LED lamp can be obtained.

[Effect of device]

As described above, according to the present invention, of the light emitted radially,
The outer peripheral part was shaped so as to be a parallel ray traveling forward due to the reflection on the paraboloid of revolution, and the central part was formed by parallel refraction by first order refraction. Becomes Therefore, when it is used as a light source of a lighting device, it is advantageous that the number of LED lamps can be small and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of an LED lamp lens according to the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is a sectional view of an LED lamp in which the lens of the embodiment and a mini-mold LED are combined. 4 and 5 are cross-sectional views showing an example of a conventional LED lamp. 10 …… Lens body, 11 …… Bottom cut surface (mounting surface), 12 …… Chip position, 13 …… Concave, 15 …… Convex section for primary refraction, 16 …… Groove, 20 …… Mini mold LED, 21 ... Epoxy resin.

Claims (1)

[Scope of utility model registration request] 1. A central part of a bottom cut surface of a parabolic rotating body is LE.
While it has a D-chip mounting position and has a substantially hemispherical recess centered on the LED chip mounting position on the cut surface,
The front surface has a ring-shaped groove in the center thereof so that a convex portion for the first-order refraction having a forward convex shape is formed, and the front surface outside the groove is molded in a flat shape with a transparent resin. A lens for an LED lamp, which is characterized in that