KR20220168797A - indoor lighting fixtures - Google Patents

Abstract

The present invention provides an indoor lighting lamp. The indoor lighting lamp comprises: a light source unit which generates light when power is applied; a light guide plate which receives light emitted from the light source unit and converts the incident light into a surface light source; a reflection unit which is disposed on a lower portion of the light guide plate and reflects the light toward the light guide plate; and a buffer unit which is located between one surface of the light source unit and one surface of the light guide plate, has one surface attached to the one surface of the light guide plate, and transmits light emitted from the light source unit to the light guide plate while preventing heat generated from the light source unit from being transferred to the light guide plate. The other surface of the buffer unit is provided with a light collecting pattern having a prism structure which converges an angle of light emitted from the light source unit and incident on the buffer unit. Therefore, the buffer unit formed of a silicon material and having a low heat transfer rate and a high light transmittance is located between the light source unit and the light guide plate so as to reduce a defect rate caused by to expansion of the light guide plate by heat from the light source unit and improve the concentrating efficiency of the light incident on the light guide plate by the light collection pattern provided on the one side of the buffer unit.

Description

Indoor lighting fixtures}

The present invention relates to an indoor lighting luminaire, and more particularly, to an indoor lighting luminaire capable of improving the light collection efficiency of light entering the light guide plate while preventing the light guide plate from being deformed by heat generated from a light source unit.

Referring to the prior art described in Korean Patent Registration No. 10-0809224, flat displays are generally classified into a light emitting type and a light receiving type. An example of a light-receiving flat panel display is a liquid crystal display. Such a liquid crystal display does not emit light itself to form an image, but forms an image by incident light from the outside, so that an image cannot be displayed in a dark place. can't observe

Therefore, a back light unit is installed on the rear surface of the liquid crystal display to emit light. Such a backlight unit is used in a surface light source device such as an illuminated signboard in addition to a light-receiving display such as a liquid crystal display device.

The backlight unit is a direct light type in which a plurality of lamps installed directly below the liquid crystal display directly radiate light to the liquid crystal panel according to the arrangement of the light source, and a light guide panel (LGP). It is classified as an edge light type in which a lamp installed at the edge irradiates light and transmits it to the liquid crystal panel.

The edge emission type backlight unit uses a line light source and a point light source as light sources. As a representative line light source, there is a cold cathode fluorescent lamp (CCFL) in which electrodes at both ends are installed in a tube, and a light emitting diode as a point light source. (LED: light emitting diode).

Here, the CCFL has the advantage of being able to emit strong white light, obtaining high brightness and high uniformity, and being able to design a large area, but has a disadvantage in that it is operated by a high-frequency AC signal and has a narrow operating temperature range. The LED is inferior to CCFL in terms of brightness and uniformity, but is operated by a DC signal, has a long lifespan, and has a wide operating temperature range. In addition, it has the advantage that thinning is possible.

In addition, the light guide plate used in the edge emission type backlight unit converts light incident from a line light source or a point light source through the edge into surface light and emits light in a vertical direction. In order to do this, a scattering pattern or a hologram pattern is formed by a printing method or a mechanical processing method.

1 is a configuration diagram showing a general backlight unit according to the prior art. As shown in FIG. 1, a conventional edge emission type backlight unit 1 includes a light source 10 provided on a substrate 12 as a line light source or a point light source, and disposed on one side thereof to convert light into surface light, not shown. It is composed of a light guide plate 20 for emitting light toward the liquid crystal panel and a reflection member 30 disposed below the light guide plate 20 and reflecting the light emitted from the light source.

A concave or convex pattern 25 is provided on the lower surface of the light guide plate 20 facing the reflective member 30 to convert light into surface light.

On the top of the light guide plate 20, a diffusion sheet for diffusing light reflected by the reflective member 30, refracted by the light guide plate 20, and emitted toward the liquid crystal panel (not shown) in various directions or passes through the diffusion sheet. It is configured with an optical sheet 40 such as a prism sheet that serves to collect one light into a front viewing angle.

Conventionally, in order to prevent contraction and expansion of the light guide plate 20 by heat generated from the light source 10, it is common to design the light guide plate 20 to have a tolerance between the light source 10 and the light guide plate 20. As the width between (20) widens, the light efficiency decreases and a loss rate occurs due to scattering of light emitted from the light source 10.

In order to prevent this, when the width between the light source 10 and the light guide plate 20 is narrowed, a product defect occurs due to a bending phenomenon caused by the expansion of the light guide plate 20.

The present invention has been created to solve the above problems, by placing a buffer unit between one side of the light source unit and the light guide plate to prevent heat generated in the light source unit from being transferred to the light guide plate, and after being emitted from the light source unit by the buffer unit, the light guide plate It is an object of the present invention to provide an indoor lighting luminaire capable of improving light efficiency by reducing light loss rate incident thereto.

In order to achieve the above object, the present invention is a light source unit for generating light when power is applied; a light guide plate receiving the light emitted from the light source unit and converting the received light into a surface light source; a reflector disposed under the light guide plate to reflect light toward the light guide plate; and located between the light source unit and one side of the light guide plate, one side being in close contact with one side of the light guide plate, and preventing heat generated from the light source unit from being transferred to the light guide plate, while transmitting light emitted from the light source unit to the light guide plate. An indoor lighting luminaire characterized in that a light condensing pattern having a prism structure condensing the angle of the light emitted from the light source unit and entering the buffer unit is provided on the other side of the buffer unit.

In the indoor lighting luminaire according to the present invention, a plurality of insertion grooves into which the LEDs of the light source unit are inserted may be spaced apart from each other on the other side of the buffer unit, and the light collecting pattern may be provided on a light incident surface in each insertion groove. there is.

The buffer unit may have a silicon material having low heat transfer rate and high light transmittance, and when the LEDs of the light source unit are inserted into the plurality of insertion grooves, the LEDs of the light source unit may be sealed by the insertion grooves.

The light collecting pattern includes a first light collecting pattern in which a plurality of first prisms having a right triangle shape are disposed at equal intervals at one end of the light incident surface, and a plurality of second prisms having a right triangle shape at the other end of the light incident surface. Second light collecting patterns disposed at equal intervals may be included, and the first prism and the second prism may have corresponding shapes based on the central portion of the light incident surface.

The first prism and the second prism may be provided to protrude outward from the light incident surface, and the first prism and the second prism extend from a central portion of the light incident surface toward a circumferential surface of the insertion groove. It may be provided on the light incident surface so that the inclined surfaces of the prism and the second prism are located.

In the indoor lighting luminaire according to the present invention, a buffer part made of silicon having a low heat transfer rate and high light transmittance is placed between the light source part and the light guide plate to reduce the defect rate due to the expansion of the light guide plate due to the heat of the light source part, and the light collecting provided on one side of the buffer part. The light condensing efficiency of the light entering the light guide plate can be improved by the pattern.

1 is a configuration diagram showing a general backlight unit according to the prior art.
2 is a cross-sectional view schematically showing the configuration of an indoor lighting luminaire according to an embodiment of the present invention.
3 is an exploded perspective view of the indoor lighting luminaire shown in FIG. 2;
FIG. 4 is an enlarged view of a main part shown in FIG. 2 .
FIG. 5 is a perspective view schematically illustrating a state in which a light collecting pattern is provided on a seating surface of the insertion groove shown in FIG. 4 .

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to the usual or dictionary meaning, and the inventor appropriately uses the concept of the term in order to explain his/her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

2 to 5, an indoor lighting luminaire 100 according to an embodiment of the present invention includes a light source unit 110, a light guide plate 120, a reflector 130, and a buffer unit 140. , One side of the buffer unit 140 is in close contact with one side of the light guide plate 120, and the other side of the buffer unit 140 is a source of light emitted from the light source unit 110 and received into the buffer unit 130. It is preferable to have a condensing pattern 144 condensing angles.

2 and 3, the light source unit 110 is a light emitting means for generating light when power is applied, and the light source unit 110 includes a plurality of LEDs 112 and a plurality of LEDs 112 at regular intervals. It includes a PCB 114 mounted spaced apart from each other.

Since the plurality of LEDs 112 and the PCB 114 on which the plurality of LEDs 112 are mounted are general, a detailed description thereof will be omitted, and the PCB 114 is a metal PCB having excellent thermal conductivity. is preferably used.

The light emitted from the LED 112 of the light source unit 110 is received by the light guide plate 120, and the light guide plate 120 serves to convert the received light into a surface light source. The light guide plate 120 is a hexahedral structure made of a transparent material such as PMMA to pass light by being disposed on one side of the LED 112 that provides light when power is applied. A refraction pattern 122 is provided to convert the light incident from the light incident vertical surface 120a into a surface light source and output the light to the light exit upper surface 120b.

The refraction pattern 122 forms a scattering pattern or a hologram pattern by a printing method or a mechanical processing method so that light received from the light source unit 110 can be converted into surface light.

Here, the refraction pattern 122 is illustrated as being recessed in the lower surface 120c of the light guide plate 120, but is not limited thereto and may protrude.

A reflector 130 is disposed under the light guide plate 120, and the reflector 130 transmits light incident to the lower surface 120c of the light guide plate 120 to the upper light output surface 120b of the light guide plate 120. It is preferable to provide a reflective sheet or reflective plate having a reflective layer having a high light reflectance so as to be reflected toward the side.

A buffer unit 140 is positioned between the light source unit 110 and one side surface of the light guide plate 120, one side surface of the buffer unit 140 is in close contact with one side surface of the light guide plate 120, and the buffer unit ( 140 serves to transfer the light emitted from the light source unit 110 to the light guide plate 120 while preventing heat generated from the light source unit 110 from being transferred to the light guide plate 120 .

Referring to FIGS. 2 and 4 , a plurality of insertion grooves 142 are spaced apart so as to be inserted into the buffer part 140 on the other side surface of the buffer part 140, one side of which is in close contact with the light guide plate 120. The LED 114 of the light source unit 110 is inserted into each insertion groove 142.

When the LEDs 114 of the light source unit 110 are inserted into the insertion grooves 142, the other side of the buffer unit 140 is in close contact with the PCB 112 of the light source unit 110, and the LEDs 114 is sealed in the insertion groove 142 and the light emitted from the LED 114 is received into the buffer unit 140 to prevent loss of the emitted light. The buffer part 140 preferably has a silicon material having a low heat transfer rate and a high light transmittance. Since the butter part 140 has a silicon material, the heat generated from the light source part 110 passes through the light guide plate 120. The light emitted from the light source unit 110 is transmitted to the light guide plate 120 without loss.

Referring to FIGS. 4 and 5 , a light collecting pattern 144 is provided on the other side of the buffer unit 140 . The light collecting pattern 144 serves to collect the angle of the light emitted from the light source unit 110 and enters the buffer unit 140. The light collecting pattern 144 has a prism structure and is inserted into the insertion groove 142. It is preferable to be provided on the light incident surface (142a) within.

The light collecting pattern 144 includes a first light collecting pattern 144a and a second light collecting pattern 144b. The first light collecting pattern 144a is disposed at one end of the light incident surface 142a, and a plurality of first prisms P1 having a rectangular shape are spaced apart at equal intervals to one side of the light incident surface 142a. The first light collecting pattern 144a is formed at the end.

The second light-collecting pattern 144b is disposed at the other end of the light-incident surface 142a, and a plurality of second prisms P2 having a rectangular shape are spaced apart at equal intervals to form a second light-incident surface 142a. The second light collecting pattern 144b is formed at a side end, and a plurality of first prisms P1 forming the first light collecting pattern 144a and a plurality of second prisms forming the second light collecting pattern 144b (P2) preferably has a shape corresponding to the central portion of the light incident surface 142a.

The first prism P1 and the second prism P2 are provided to protrude outward from the light incident surface 142a, and the first prism P1 and the second prism P2 are provided to protrude outward from the light incident surface 142a. It is provided on the light incident surface 142a so that an inclined surface is located in the circumferential direction of the insertion groove 142 from the central portion of the light surface 142a.

The first prism P1 and the second prism P2 protrude from the light incident surface 142a so that the inclined surfaces of the first prism P1 and the second prism P2 are positioned in the circumferential direction. As a result, the light emitted from the LED 114 located in the insertion groove 142 is condensed to the central portion of the light incident surface 142a by the first and second condensing patterns 144a and 144b.

Therefore, a buffer unit 140 having a silicon material having a low heat transfer rate and a high light transmittance is placed between the light source unit 110 and the light guide plate 120 so that the light guide plate 120 expands due to the heat of the light source unit 110. The defect rate can be reduced, and the light collecting efficiency of the light incident to the light guide plate 120 can be improved by the light collecting pattern 144 provided on one surface of the buffer unit 140 .

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: indoor lighting luminaire 110: light source unit
112: PCB 114: LED
120: light guide plate 130: reflector
140: buffer part 142: insertion groove
144: condensing pattern

Claims (6)

a light source unit generating light when power is applied;
a light guide plate receiving the light emitted from the light source unit and converting the received light into a surface light source;
a reflector disposed under the light guide plate to reflect light toward the light guide plate; and
It is located between the light source unit and one side of the light guide plate, and one side is in close contact with one side of the light guide plate, and transfers the light emitted from the light source unit to the light guide plate while preventing heat generated from the light source unit from being transferred to the light guide plate. Including a buffer to do,
An indoor lighting luminaire according to claim 1 , wherein a condensing pattern having a prism structure for condensing an angle of light emitted from the light source unit and received into the buffer unit is provided on the other side surface of the buffer unit.
The method of claim 1,
A plurality of insertion grooves into which LEDs of the light source unit are inserted are spaced apart from each other on the other side of the buffer unit,
The indoor lighting luminaire according to claim 1 , wherein the light collecting pattern is provided on a light incident surface in each insertion groove.
The method of claim 2,
The buffer part has a low heat transfer rate and a high light transmittance indoor lighting luminaire, characterized in that it has a silicon material.
The method of claim 2,
When the LEDs of the light source unit are inserted into the plurality of insertion grooves, the LEDs of the light source unit are sealed by the insertion grooves.
The method of claim 2,
The light collection pattern,
A first condensing pattern in which a plurality of first prisms having a right triangle shape are arranged at equal intervals at one end of the light incident surface;
A second light collecting pattern in which a plurality of second prisms having a right triangle shape are arranged at equal intervals at the other end of the light incident surface;
The indoor lighting luminaire of claim 1, wherein the first prism and the second prism have corresponding shapes based on a central portion of the light incident surface.
The method of claim 5,
The first prism and the second prism are provided to protrude outward from the light incident surface,
wherein the first prism and the second prism are provided on the light incident surface such that inclined surfaces of the first prism and the second prism are positioned in a direction from a central portion to a circumferential surface of the insertion groove. .

Images