JP2017068903A - LED module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED module which can obtain pseudo filament emission.SOLUTION: An LED module 1 comprises an LED 3 or a light source, and a light guide body 4 for guiding light incident from the LED 3. The light guide body 4 is constituted of a light guide part 4A for guiding the light from the LED 3 incident from an incident face at one end to the other end while reflecting and refracting it, and a pseudo filament part 4B formed at the other end of the light guide part 4A. The pseudo filament part 4B is constituted of a long column body in a direction orthogonal to a light axis of the LED 3, and a plurality of grooves 4a along a longitudinal direction are formed in a circumferential direction at an external peripheral face of the column body. Longitudinal both end faces 4b of the pseudo filament part 4B of the light guide body 4 are formed into recessed shapes or protrusive shapes, and grooves 4c which intersect with the longitudinal direction are formed at a plurality of longitudinal points of the pseudo filament part 4B over the whole periphery.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an LED module that realizes pseudo filament light emission by irradiating light with strong directivity emitted from an LED in all directions on the circumference.

  For example, an incandescent light source module 101 is shown in FIG. 6, and the incandescent light source module 101 has a tungsten wire wound in a coil shape around the ends of a pair of left and right lead frames 103 erected on a glass stem 102. It is configured by laying a rotating filament 104. The incandescent lamp is configured by sealing the light source module 101 with a glass bulb (not shown).

  In such a light source module 101, when a current is supplied from a power source (not shown) to the filament 104 via the lead frame 103, the filament 104 emits light, and the light is emitted in all directions on the circumference. .

  By the way, in recent years, LEDs (light emitting diodes) having advantages such as high luminous efficiency, long life, and power saving are being used as light sources, and LED bulbs using LEDs instead of conventional filaments have been used. Although it has appeared, the light emitted from the LED has a strong directivity, and thus there is a problem that light cannot be irradiated in all directions on the circumference like an incandescent bulb using a filament.

  As an LED module using an LED as a light source, Patent Document 1 proposes an LED module shown in FIG.

  That is, FIG. 7 is a partial cross-sectional perspective view of the LED module proposed in Patent Document 1, and the illustrated LED module 201 includes an LED (not shown) mounted on a circuit board 202 as a light source. A light guide (optical waveguide) 203 is erected above 202. A cylindrical light emitter 204 is formed at the upper end of the light guide 203, and the periphery of the light guide 203 is covered with a shroud 205 that does not transmit light.

  In such an LED module 201, light emitted upward from the LED is guided upward to the light emitter 204 through the light guide 203, and emitted from the outer peripheral surface of the light emitter 204 to the outside. Therefore, the entire light emitter 204 emits light.

  However, even in the LED module 201 shown in FIG. 7 proposed in Patent Document 1, the light emitted from the light emitter 204 cannot be irradiated in all directions on the circumference, and pseudo-filament light emission is realized. There is a problem that can not be.

  Therefore, the present applicant has previously proposed the LED module shown in FIG. 8 (see Patent Document 2).

  That is, FIG. 8 is a perspective view of the main part of the light guide body of the LED module proposed in Patent Document 2, and the LED module includes an LED (not shown) and a light guide body that stands vertically above the LED. 304 is comprised. Here, the light guide 304 includes a flat trapezoidal plate-shaped light guide 304A, and a columnar pseudo-light integrally formed in the lateral direction (width direction of the light guide 304A) on the upper end of the light guide 304A. It consists of a filament part 304B.

  More specifically, the lower surface (not shown) of the light guide 304 facing the LED of the light guide 304A constitutes an incident surface, and the pseudo filament 304B is in the lateral direction perpendicular to the vertical optical axis of the LED. It is formed along (the width direction of the light guide portion 304A), and a plurality (seven in the illustrated example) of grooves 304a having a circular cross section along the longitudinal direction are formed on the outer peripheral surface thereof.

  In the LED module including the light guide 304 described above, when a current is supplied to the LED from a power source (not shown), the LED is activated to emit light, and light directed upward is emitted from the light guide unit of the light guide 304. The light enters the light guide 304A from the incident surface which is the lower end surface of 304A. Then, the light incident on the light guide 304A of the light guide 304 proceeds upward toward the pseudo filament 304B while repeating reflection and refraction in the light guide 304A, and the outer periphery of the cylindrical pseudo filament 304B. The light is refracted and emitted by a plurality (seven) of grooves 304a formed on the surface.

JP 2006-012824 A Japanese Patent Application No. 2015-047991

  However, in the LED module provided with the light guide 304 shown in FIG. 8 proposed in Patent Document 2, the light emitted from the pseudo filament portion 304B of the light guide 304 is viewed from the side (in the direction of the arrow X in FIG. 8). Then, as shown in FIG. 9 (a), the light is emitted in all directions on the circumference, but in the front view (in the Y direction of the arrow in FIG. 8), as shown in FIG. Was not emitted. For this reason, there is a problem that light cannot be emitted from the pseudo filament portion 304B of the light guide 304 in all directions on the circumference, and complete pseudo filament light emission cannot be realized.

  The present invention has been made in view of the above problems, and an object thereof is to provide an LED module capable of realizing pseudofilament light emission.

  In order to achieve the above object, the invention according to claim 1 includes an LED that is a light source and a light guide that guides light incident from the LED, and the LED that enters the light guide from an incident surface at one end. A light guide part that guides light from the other end while reflecting and refracting light, and a pseudo filament part formed at the other end of the light guide part, and the pseudo filament part is orthogonal to the optical axis of the LED In the LED module comprising a plurality of grooves extending along the longitudinal direction on the outer peripheral surface of the column body, both end surfaces in the longitudinal direction of the pseudo filament portion of the light guide are formed on the outer peripheral surface of the column body. An LED module having a concave shape or a convex shape, and grooves that are orthogonal to the longitudinal direction are formed at a plurality of locations in the longitudinal direction of the pseudo filament portion over the entire circumference.

  According to a second aspect of the present invention, in the first aspect of the invention, the outer peripheral surface of the light guide portion of the light guide is subjected to a reflection process.

  According to a third aspect of the present invention, in the first aspect of the present invention, between the thickness y of one end on the incident surface side of the light guide portion of the light guide and the thickness x of the other end on the pseudo filament portion side. , Y ≦ 1.2x is established.

  According to the first aspect of the present invention, the light emitted from the LED is guided to the pseudo filament part while repeating reflection and refraction inside the light guide part of the light guide, and is formed on the outer peripheral surface of the columnar pseudo filament. Refracted by the plurality of grooves formed, and also refracted by the concave or convex shape on both ends in the longitudinal direction of the pseudofilament part and grooves formed at a plurality of locations in the longitudinal direction. The light is emitted in all directions. For this reason, pseudo filament light emission similar to the light emission of the filament used in the incandescent bulb is realized, and the pseudo filament portion of the light guide functions as an alternative light source for the filament.

  According to the second aspect of the present invention, since the outer peripheral surface of the light guide part of the light guide is subjected to the reflection treatment, the light guided inside the light guide part of the light guide does not leak outside the light guide part, and the LED The light from is used effectively.

  According to the third aspect of the present invention, y ≦ 1.2x is satisfied between the thickness y of one end on the incident surface side of the light guide portion of the light guide and the thickness x of the other end on the pseudo filament portion side. When the relationship is established, the light guided in the light guide part of the light guide is not totally reflected on the outer peripheral surface of the light guide part and leaks to the outside, so that the light from the LED is effectively used. In this case, since it is not necessary to perform a reflection process on the outer peripheral surface of the light guide unit, the cost of the LED module can be reduced.

It is a disassembled perspective view of an LED bulb provided with the LED module which concerns on this invention. It is a perspective view of the LED module which concerns on this invention. FIG. 3 is an enlarged detail view of a part A in FIG. 2. It is the A section enlarged front view of FIG. (A) is a light ray diagram of the LED module according to the present invention as viewed from the side (viewed in the direction of arrow X in FIG. 3), and (b) is a view of the LED module from the front (viewed in the direction of arrow Y in FIG. 3). FIG. It is a front view which shows the structure of the incandescent lamp using a filament. It is a fragmentary sectional perspective view of the LED module proposed in patent documents 1. It is a perspective view of the principal part of the light guide body of the LED module proposed in patent document 2. FIG. (A) is a ray diagram of the LED module proposed in Patent Document 2 as seen from the side (viewed in the direction of arrow X in FIG. 8), and (b) is a view of the LED module from the front (viewed in arrow Y in FIG. 8). (Directional view) FIG.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is an exploded perspective view of an LED bulb including the LED module according to the present invention, FIG. 2 is a perspective view of the LED module according to the present invention, FIG. 3 is an enlarged detail view of part A in FIG. 2, and FIG. FIG.

  The LED module 1 according to the present invention is used in, for example, the LED bulb 10 shown in FIG. 1. The illustrated LED bulb 10 covers the LED module 1 with a glass bulb 11 and the opening end of the bulb 11 is a base. 12 is sealed.

  As shown in FIG. 2, the LED module 1 includes an LED 3 mounted on a substrate 2 and a light guide 4 that stands vertically above the LED 3. Here, LED3 is mounted on the board | substrate 2 so that the light emission direction may become upward. The light guide 4 includes a flat trapezoidal plate-shaped light guide portion 4A made of transparent resin such as polycarbonate or acrylic having light guide properties, and a lateral direction (width of the light guide portion 4A) at the upper end of the light guide portion 4A. The columnar pseudo filament portion 4B is integrally formed in the direction).

  More specifically, the lower surface of the light guide 4 facing the LED 3 of the light guide 4A constitutes an incident surface. In this embodiment, the thickness y of the lower end of the light guide 4A on the incident surface side is The thickness x of the upper end of the light guide 4A on the pseudo filament 4B side is set to be thicker (y> x). Then, the outer peripheral surface of the light guide unit 4 is subjected to a reflection process such as aluminum vapor deposition. In the present embodiment, the upper end thickness x of the light guide 4A is set to 0.5 mm, and the lower end thickness y is set to 0.6 mm (y ≦ 1.2x is satisfied).

  Further, the columnar pseudo filament portion 4B of the light guide 4 is formed along a lateral direction (width direction of the light guide portion 4A) perpendicular to the vertical optical axis of the LED 3, and is shown in detail in FIG. Thus, a plurality (11 in the illustrated example) of grooves 4a having a regular triangular cross section along the longitudinal direction are formed on the outer peripheral surface. In the present embodiment, the outer diameter of the pseudo filament portion 4B is set to 1.0 mm, and a total of 11 sides of 7 pieces are provided in the upper half of the outer periphery of the pseudo filament portion 4B and four at the lower end. A groove 4a having an equilateral triangular shape of 11 mm is formed.

  In the present embodiment, as shown in FIGS. 3 and 4, both longitudinal end surfaces 4b of the pseudo filament portion 4B of the light guide 4 are formed into a hemispherical concave shape having a depth of 1.0 mm. In addition, grooves 4c having a regular triangular cross section orthogonal to the longitudinal direction are formed over the entire circumference at a plurality of longitudinal locations (four locations in the illustrated example) of the pseudo filament portion 4B. In the present embodiment, each of the four grooves 4c has a cross-sectional shape of a regular triangle having a side of 0.35 mm, but the number and the cross-sectional shape of the grooves 4c are arbitrary.

  In the LED bulb 10 shown in FIG. 1 having the LED module 1 configured as described above, when current is supplied to the LED 3 from the power source (not shown) through the base 12 and the substrate 2, the LED 3 is activated to emit light. The light traveling upward is incident on the inside of the light guide 4A from the incident surface which is the lower end surface of the light guide 4A of the light guide 4. Then, the light incident on the light guide 4A of the light guide 4 proceeds upward toward the pseudo filament 4B while repeating reflection and refraction in the light guide 4A, and the outer periphery of the cylindrical pseudo filament 4B. In addition to being refracted by a plurality (11) of grooves 4a formed on the surface, it is also refracted by the shape of both end faces 4b in the longitudinal direction of the pseudo filament portion 4B and grooves 4c formed at a plurality of places (4 places) in the longitudinal direction. The light is emitted in all directions on the circumference including the lateral direction and the downward direction.

  Here, a light ray diagram of the LED module 1 according to the present invention viewed from the side (viewed in the direction X of the arrow in FIG. 3) and a light ray diagram of the LED module viewed from the front (viewed in the direction of the arrow Y in FIG. 3). As shown in FIGS. 5A and 5B, as shown in the figure, the light emitted from the LED 3 is emitted in all directions on the circumference including the lateral direction and the downward direction. For this reason, pseudo filament light emission similar to the light emission of the filament used in the incandescent bulb is realized, the pseudo filament portion 4B of the light guide 4 functions as an alternative light source of the filament, and the LED bulb 10 is a conventional incandescent bulb. Could be used as an alternative to

  And in this Embodiment, since the outer peripheral surface of the light guide part 4A of the light guide 4 was subjected to the reflection process, the light guided inside the light guide part 4A of the light guide 4 leaks out of the light guide part 4A. The effect that the light from LED3 is utilized effectively is obtained.

By the way, when the reflection process is performed on the outer peripheral surface of the light guide portion 4A of the light guide body 4, the cost is increased, but the thickness y of the lower end on the incident surface side of the light guide portion 4A of the light guide body 4 and the pseudofilament Between the thickness x of the upper end on the part 4B side,
y ≦ 1.2x
If this relationship is established, the light guided in the light guide 4A of the light guide 4 is not totally reflected on the outer peripheral surface of the light guide 4A and leaks to the outside. For this reason, although the light from LED3 is used effectively, in this case, since it is not necessary to perform a reflection process to the outer peripheral surface of the light guide part 4B, the cost reduction of the LED module 1 can be aimed at.

  Here, when an example of the combination of the thickness x at the upper end and the thickness y at the lower end of the light guide 4A of the light guide 4 is shown, (x, y) = (0.5, 0.6), ( 0.5, 0.5), (0.5, 0.4), and (0.5, 0.2) (all units are mm).

  By the way, in the above embodiment, although the pseudo filament part 4B of the light guide 4 was comprised with the cylinder, you may comprise, for example with a hexagonal column and another polygonal column. In the above embodiment, eleven grooves 4a having a regular equilateral triangle are formed on the outer peripheral surface of the pseudo filament portion 4B. However, the number and the cross-sectional shape of the grooves 4a are arbitrary. Further, in the above embodiment, the longitudinal end surfaces 4b of the pseudo filament portion 4B of the light guide 4 are formed in a hemispherical concave shape, but a conical concave shape, or a hemispherical shape or a conical convex shape. It is good also as a shape.

  The LED module according to the present invention can be used for arbitrary devices such as vehicle lamps such as stop lamps, tail lamps, and turn signal lamps, household lighting fixtures, outdoor lighting fixtures, and decorative lighting fixtures.

1 LED module 2 Substrate 3 LED
4 Light Guide 4A Light Guide 4D Light Guide 4B Pseudo Filament 4a Pseudo Filament Groove 4b Longitudinal End Face of Pseudo Filament 4c Pseudo Filament Groove 10 LED Light Bulb 11 Valve 12 Base

Claims (3)

An LED as a light source and a light guide that guides light incident from the LED are provided, and the light guide is guided to the other end while reflecting and refracting light from the LED incident from one incident surface. It comprises a light part and a pseudo filament part formed at the other end of the light guide part, and the pseudo filament part is constituted by a column that is long in a direction perpendicular to the optical axis of the LED, and the outer periphery of the column In the LED module formed by forming a plurality of grooves along the longitudinal direction in the circumferential direction on the surface,
The both ends in the longitudinal direction of the pseudo filament portion of the light guide are concave or convex, and grooves perpendicular to the longitudinal direction are formed over the entire circumference at a plurality of locations in the longitudinal direction of the pseudo filament portion. LED module.   The LED module according to claim 1, wherein the outer peripheral surface of the light guide portion of the light guide is subjected to a reflection process. A relationship of y ≦ 1.2x is established between the thickness y of one end on the incident surface side of the light guide portion of the light guide and the thickness x of the other end on the pseudo filament portion side. The LED module according to claim 1.

Images