WO2011004642A1

WO2011004642A1 - Lens, light emitting element package, light emitting module, illumination device, display device, and television receiver device

Info

Publication number: WO2011004642A1
Application number: PCT/JP2010/055057
Authority: WO
Inventors: 敬治清水
Original assignee: シャープ株式会社
Priority date: 2009-07-06
Filing date: 2010-03-24
Publication date: 2011-01-13

Abstract

A lens includes an exit surface for allowing transmission light to be emitted and a light receiving surface being at least part of the back surface of the exit surface and receiving light becoming the source of the transmission light. The lens includes at least one of the exit surface satisfying the following condition (1) and the light receiving surface satisfying the following condition (2): (1) The edge of the exit surface is ring-like, and one arbitrary point inside the ring is chosen as a reference point. The exit surface includes a non-spherical surface formed by an aggregate of a plurality of points spaced apart from the reference point by different arbitrary distances (however, the ring-like edge of the exit surface includes at least three inflection points). (2) The edge of the light receiving surface is ring-like, and one arbitrary point inside the ring is chosen as a reference point. The light receiving surface includes a non-spherical surface formed by an aggregate of a plurality of points spaced apart from the reference point by different arbitrary distances (however, the ring-like edge of the light receiving surface includes at least three inflection points).

Description

Lens, light emitting element package, light emitting module, illumination device, display device, and television receiver

The present invention relates to a lens, a light emitting element package, a light emitting module, a lighting device, a display device, and a television receiver.

In a liquid crystal display device (display device) equipped with a non-light emitting liquid crystal display panel (display panel), a backlight unit (illumination device) for supplying light is usually mounted on the liquid crystal display panel. There are various types of light sources in the backlight unit. For example, in the case of the liquid crystal display device 169 of Patent Document 1 as shown in FIG. 15, the light source mounted on the backlight unit 149 is an LED (Light Emitting Diode).

And in this backlight unit 149, the lens 110 which diffuses the light from LED chip cp mounted in the mounting board | substrate 120 is attached (refer the perspective view of FIG. 16, and sectional drawing of FIG. 17).

JP 2006-114863 A

By the way, as shown in FIG. 15, when the lenses 110 are arranged in a row on the mounting substrate 120, and the mounting substrates 120 are arranged parallel to each other in the row direction of the lens 10, the lens 110 becomes a matrix arrangement. In such a case, when the illuminance from the front surface of the mounting substrate 120 is photographed, an image as shown in FIG. 18 is usually obtained. In this image, a matrix-like light amount unevenness reflecting the arrangement of the lenses 110 appears so as to be emphasized by a white dotted line (note that only a part of the light amount unevenness is emphasized and shown for convenience).

This is because the light from the lens 110 has regularity centering on the light emitting chip CP as shown in FIGS. More specifically, the transmitted light from the lens 110 is light that generates a radial luminance distribution centered on the lens 110 (light that generates a rotationally symmetric and line-symmetric luminance distribution; see broken line).

Therefore, when such lenses 110 are arranged in a matrix, the transmitted light from the plurality of lenses 110 regularly intersect, resulting in matrix-like light amount unevenness (interference unevenness). The light that does not generate a radial (circular) luminance distribution centered on is assumed to be light that proceeds non-radially}.

The present invention has been made to solve the above problems. And the objective is to provide the lens etc. which do not include the light quantity nonuniformity (for example, interference nonuniformity) in the light from illuminating devices like a backlight unit.

The lens includes an emission surface that emits transmitted light and a light receiving surface that is at least part of the back surface of the emission surface and receives light that is a basis of the transmitted light. This lens includes at least one of the following (1) emitting surface and (2) light receiving surface.

(1) The edge on the exit surface is annular, and an arbitrary point inside the ring is used as a reference point. The exit surface is an aspheric surface formed by a set of a plurality of points separated from the reference point by an arbitrary distance. (However, the edge on the exit surface is an annular shape including at least three inflection points).

(2) The edge of the light-receiving surface is annular, and an arbitrary point inside the ring is used as a reference point. The light-receiving surface is an aspheric surface formed by a set of a plurality of points separated from the reference point by arbitrary different distances. (However, the edge on the light-receiving surface is an annular shape including at least three inflection points).

When such an aspheric surface is included in the lens, the transmitted light from the lens travels in a non-radial manner due to the influence of the aspheric surface. Then, for example, if the illuminating device arranges a plurality of light emitting elements that supply light to the light receiving surface of such a lens and generates planar light, excessive light is collected at a specific portion in the surface. , The light does not collect excessively in a specific part of the surface. Therefore, the light amount unevenness is not included in the planar light from the illumination device.

In particular, even when the lenses are regularly arranged, when the planar light is formed by non-radial light from all the lenses, the planar light has a light amount unevenness (for example, due to the regular arrangement of the lenses) , Interference unevenness) is not included. Therefore, in other words, the above lens can be said to be a suitable lens for preventing unevenness in the amount of light from being included in the planar light from the illumination device.

In addition, it is desirable that at least one of the edge of the emission surface and the edge of the light receiving surface of the lens is an annular shape that is at least one of non-rotation symmetric and non-linear symmetry.

In this case, the light from the lens is not light that produces a radial luminance distribution centered on the lens, but a luminance distribution that is at least one of non-rotationally symmetric and non-linearly symmetric about the lens. (That is, light having no regularity is emitted from the lens).

Note that the light receiving surface may be the entire back surface of the exit surface of the lens or the inner surface of a depression formed on the back surface of the exit surface. In short, it is only necessary that the light-receiving surface of the lens can receive light.

Further, it is sufficient that the lens has a diffusibility for diffusing transmitted light. If it has become like this, for example, when a plurality of lenses are arranged in an illuminating device, the light from these lenses will mix with a high degree and become planar light. Then, due to the non-radial light from the lens, the effect of not including unevenness in the amount of light in the planar light of the lighting device appears significantly.

Note that a light-emitting module including the lens as described above, a light-emitting element that supplies light to the light-receiving surface of the lens, and a mounting substrate on which the light-emitting element and the lens are attached can be said to be the present invention. Further, a light-emitting element package in which the above-described lens and a light-emitting element that supplies light to the light-receiving surface of the lens are in close contact can be said to be the present invention, and further includes a mounting substrate on which the light-emitting element package is attached. The light emitting module can also be said to be the present invention. In particular, a light emitting module in which a plurality of sets of lenses and light emitting elements are regularly arranged is desirable.

Moreover, it can be said that the present invention also includes a lighting device including one or a plurality of such light emitting modules. Of course, a display device including such a lighting device and a display panel (for example, a liquid crystal display panel) that receives light from the lighting device can also be said to be the present invention. TV receiver is an example).

¡According to the lens of the present invention, the transmitted light from itself advances non-radially without regularity. Therefore, in the planar light of an illumination device equipped with a plurality of such lenses, even if the light from the lenses is mixed, interference unevenness is hardly caused.

FIG. 14 is a partial perspective view of the LED module (Example 1) shown in FIG. 13. These are the front views of the LED module of Example 1. FIG. FIG. 3 is a cross-sectional view of the LED module of Example 1 (note that the cross-sectional direction of the cross-sectional view is the direction of arrows A1-A1 ′ in FIGS. 1 and 2A). These are the rear views of the LED module of Example 1. FIG. These are the front views of the lens in the LED module of Example 1. FIG. FIG. 3 is a cross-sectional view of a lens in the LED module of Example 1 (note that the cross-sectional direction of the cross-sectional view is the direction of arrow B1-B1 ′ in FIG. 3A). These are the rear views of the lens in the LED module of Example 1. FIG. These are the front views of the mounting substrate in the LED module of Example 1. FIG. FIG. 4 is a cross-sectional view of the mounting substrate in the LED module of Example 1 (note that the cross-sectional direction of the cross-sectional view is the direction of arrow C1-C1 ′ in FIG. 4A). These are the front views of the LED module of Example 2. FIG. FIG. 5 is a cross-sectional view of the LED module of Example 2 (note that the cross-sectional direction of the cross-sectional view is the direction of arrow A2-A2 ′ in FIG. 5A). These are the rear views of the LED module of Example 2. FIG. These are the front views of the lens in the LED module of Example 2. FIG. FIG. 6 is a cross-sectional view of a lens in the LED module of Example 2 (note that the cross-sectional direction of the cross-sectional view is the direction of arrow B2-B2 ′ in FIG. 6A). These are the rear views of the lens in the LED module of Example 2. FIG. These are the front views of the LED module of Example 3. FIG. FIG. 6 is a cross-sectional view of the LED module of Example 3 (note that the cross-sectional direction of the cross-sectional view is the direction of arrow A3-A3 ′ in FIG. 7A). These are the rear views of the LED module of Example 3. FIG. These are the front views of the lens in the LED module of Example 3. FIG. FIG. 8 is a cross-sectional view of a lens in the LED module of Example 3 (note that the cross-sectional direction of the cross-sectional view is the direction of arrow B3-B3 ′ in FIG. 8A). These are the rear views of the lens in the LED module of Example 3. FIG. These are the front views of the lens in the LED module of Example 4. FIG. FIG. 9 is a cross-sectional view of a lens in the LED module of Example 4 (note that the cross-sectional direction of the cross-sectional view is the direction of arrow B4-B4 ′ in FIG. 9A). These are the rear views of the lens in the LED module of Example 4. FIG. These are the front views of the lens in the LED module of Example 5. FIG. FIG. 10 is a cross-sectional view of a lens in the LED module of Example 5 (note that the cross-sectional direction of the cross-sectional view is the direction of arrow B5-B5 ′ in FIG. 10A). These are the rear views of the lens in the LED module of Example 5. FIG. These are sectional drawings of an LED module. These are sectional drawings of an LED module. FIG. 3 is an exploded perspective view of a liquid crystal display device. These are the exploded perspective views of the liquid crystal television which mounts a liquid crystal display device. FIG. 6 is an exploded perspective view of a conventional liquid crystal display device. FIG. 3 is a perspective view of a conventional lens. These are sectional drawings of the conventional lens. These are images which show the illumination distribution of the planar light from the conventional backlight unit.

[Embodiment 1]
The following describes one embodiment with reference to the drawings. For convenience, hatching, member codes, and the like may be omitted, but in such a case, other drawings are referred to. Moreover, even if it is a figure other than sectional drawing, hatching may be attached | subjected for convenience.

FIG. 14 shows a liquid crystal television 89 equipped with a liquid crystal display device (display device) 69. Note that such a liquid crystal television 89 can be said to be a television receiver because it receives a television broadcast signal and projects an image. FIG. 13 is an exploded perspective view showing the liquid crystal display device. As shown in this figure, a liquid crystal display device 69 includes a liquid crystal display panel 59, a backlight unit (illumination device) 49 that supplies light to the liquid crystal display panel 59, and a housing HG (front housing HG1) that sandwiches them. -Back housing HG2).

In the liquid crystal display panel 59, an active matrix substrate 51 including a switching element such as a TFT (Thin Film Transistor) and a counter substrate 52 facing the active matrix substrate 51 are bonded together with a sealant (not shown). Then, liquid crystal (not shown) is injected into the gap between the

substrates

51 and 52.

A polarizing film 53 is attached to the light receiving surface side of the active matrix substrate 51 and the emission side of the counter substrate 52. The liquid crystal display panel 59 as described above displays an image using the change in transmittance caused by the inclination of the liquid crystal molecules.

Next, the backlight unit 49 positioned immediately below the liquid crystal display panel 59 will be described. The backlight unit 49 includes an LED module (light emitting module) MJ, a backlight chassis 41, a large reflective sheet 42, a diffusion plate 43, a prism sheet 44, and a microlens sheet 45.

As shown in FIG. 1 which is a partial perspective view of FIG. 13, the LED module MJ includes a mounting substrate 20, an LED (Light Emitting Diode) 30, and a lens 10 (note that the LED 30 and the lens 10 covering the LED 30 are Is also referred to as LED set ST).

The mounting substrate 20 is a plate-like and rectangular substrate, and a plurality of electrodes (not shown) are arranged on the mounting surface 20U. Note that a resist film (not shown) serving as a protective film is formed on the mounting surface 20U of the mounting substrate 20. The resist film is not particularly limited, but is desirably white having reflectivity. This is because even if light is incident on the resist film, the light is reflected by the resist film and tends to go outside, thereby eliminating the cause of unevenness in the amount of light due to light absorption by the mounting substrate 20.

The LED 30 is a light emitting element (light source), and emits light by current through the electrodes of the mounting substrate 20. And there are many kinds of LED30, and the following LED30 is mentioned. For example, the LED 30 includes an LED chip that emits blue light (light emitting chip) and a phosphor that receives light from the LED chip and emits yellow light in a fluorescent manner (note that the number of LED chips is Not particularly limited). Such an LED 30 generates white light from light from a blue light emitting LED chip and light emitted from a fluorescent light.

However, the phosphor incorporated in the LED 30 is not limited to a phosphor that emits yellow light. For example, the LED 30 includes a blue light emitting LED chip and a fluorescent material that receives light from the LED chip and emits green light and red light, and emits blue light and fluorescent light emitted from the LED chip ( White light may be generated with green light and red light.

Further, the LED chip incorporated in the LED 30 is not limited to the one emitting blue light. For example, the LED 30 may include a red LED chip that emits red light, a blue LED chip that emits blue light, and a phosphor that emits green light by receiving light from the blue LED chip. This is because with such an LED 30, white light can be generated from red light from the red LED chip, blue light from the blue LED chip, and green light that emits fluorescence.

Alternatively, the LED 30 may not include any phosphor. For example, the LED 30 may include a red LED chip that emits red light, a green LED chip that emits green light, and a blue LED chip that emits blue light, and generates white light using light from all the LED chips.

In the backlight unit 49 shown in FIG. 13, a relatively short mounting board 20 in which five LEDs 30 are mounted in a row on one mounting board 20, and eight LEDs 30 on one mounting board 20. A relatively long mounting board 20 mounted in a row is mounted.

In particular, the two types of mounting boards 20 are arranged so that a row of five LEDs 30 and a row of eight LEDs 30 are arranged as a row of 13 LEDs 30, and further, with respect to the direction in which the 13 LEDs 30 are arranged, Two types of mounting boards 20 are also arranged in a direction intersecting (orthogonal, etc.). As a result, the LEDs 30 are arranged in a matrix, and as a result, the light from the plurality of LEDs 30 is mixed to form planar light (for convenience, the direction in which different types of mounting boards 20 are arranged is the X direction, and the same type of mounting boards 20 are arranged. The direction is the Y direction, and the direction intersecting the X direction and the Y direction is the Z direction).

The thirteen LEDs 30 arranged in the X direction are electrically connected in series, and the thirteen LEDs 30 connected in series are connected to another thirteen LEDs 30 connected in series along the Y direction. Electrically connected in parallel. The LEDs 30 arranged in a matrix are driven in parallel.

The lens 10 receives light from the LED 30 and transmits (emits) the light. More specifically, the lens 10 has an accommodation recess DH (see FIG. 3B described later) that can accommodate the LED 30 on the back surface 10B side of the lens surface (emission surface) 10S that emits transmitted light, and the accommodation recess DH and the LED 30. The LED 30 is covered while adjusting the position. Then, the LED 30 is embedded in the lens 10, and the light from the LED 30 is reliably supplied into the lens 10. And most of the supplied light is emitted to the outside through the lens surface 10S.

In addition, although the material used as the lens 10 is not specifically limited, For example, an acrylic resin is mentioned (The acrylic resin whose refractive index nd is 1.49 or more and 1.50 or less is mentioned). Further, since the lens surface 10S of the lens 10 has a curved surface that allows light to diffuse and transmit, the lens 10 can be said to be a diffusing lens.

As shown in FIG. 13, the backlight chassis 41 is, for example, a box-shaped member, and houses the plurality of LED modules MJ by spreading the LED modules MJ on the bottom surface 41B. The bottom surface 41B of the backlight chassis 41 and the mounting substrate 20 of the LED module MJ are connected, for example, via rivets (not shown).

Support pins for supporting the diffusion plate 43, the prism sheet 44, and the microlens sheet 45 may be attached to the bottom surface 41B of the backlight chassis 41. Then, the diffusion plate 43, the prism sheet 44, and the microlens sheet 45 may be stacked and supported in this order).

The large reflective sheet 42 is an optical sheet having a reflective surface 42U, and covers the plurality of LED modules MJ arranged in a matrix with the back surface of the reflective surface 42U facing. However, the large-format reflection sheet 42 includes a through hole 42H that matches the position of the lens 10 of the LED module MJ, and exposes the lens 10 from the reflection surface 42U (note that the above-described rivets and support pins are not exposed). There should be holes).

Then, even if a part of the light emitted from the lens 10 travels toward the bottom surface 41B side of the backlight chassis 41, the light is reflected by the reflective surface 42U of the large reflective sheet 42 and travels away from the bottom surface 41B. To do. Accordingly, the presence of the large reflective sheet 42 causes the light from the LED 30 to travel toward the diffusion plate 43 facing the reflective surface 42U without loss.

The diffusion plate 43 is an optical sheet that overlaps the large reflective sheet 42, and diffuses the light emitted from the LED module MJ and the reflected light from the large reflective sheet 42U. That is, the diffusing plate 43 diffuses the planar light formed by the plurality of LED modules MJ and spreads the light over the entire liquid crystal display panel 59.

The prism sheet 44 is an optical sheet that overlaps the diffusion plate 43. The prism sheet 44 arranges, for example, triangular prisms extending in one direction (linear) in a direction intersecting with one direction in the sheet surface. Thereby, the prism sheet 44 deflects the radiation characteristic of the light from the diffusion plate 43. In addition, it is preferable that the prisms extend along the Y direction where the number of LEDs 30 is small and are arranged along the X direction where the number of LEDs 30 is large.

The microlens sheet 45 is an optical sheet that overlaps the prism sheet 44. The microlens sheet 45 disperses the fine particles that refract and scatter light inside. As a result, the microlens sheet 45 suppresses the light / dark difference (light intensity unevenness) without locally condensing the light from the prism sheet 44.

The backlight unit 49 as described above passes the planar light formed by the plurality of LED modules MJ through the plurality of optical sheets 43 to 45 and supplies the light to the liquid crystal display panel 59. Thereby, the non-light-emitting liquid crystal display panel 59 receives the light (backlight light) from the backlight unit 49 and improves the display function.

Here, the lens 10 in the LED module MJ will be described in detail with reference to FIGS. 2A to 4B in addition to FIG. 1 is a partial perspective view of the LED module MJ, and FIGS. 2A to 2C are a front view, a cross-sectional view, and a rear view of the LED module MJ (note that the cross-sectional direction of the cross-sectional view is the same as that of FIGS. 1 and 2A). (A1-A1 ′ direction of arrow) 3A to 3C are a front view, a cross-sectional view, and a rear view of the lens 10 (note that the cross-sectional direction of the cross-sectional view is the direction of the arrow B1-B1 ′ in FIG. 3A), FIG. 4A and FIG. FIG. 4 is a front view and a cross-sectional view of the mounting substrate (note that the cross-sectional direction of the cross-sectional view is the direction of arrow C1-C1 ′ in FIG. 4A). In addition, let LED module MJ shown by FIG. 1 etc. be Example 1 (EX1).

First, a method of attaching the lens 10 (in other words, a coupling mechanism between the lens 10 and the mounting substrate 20) will be described. The lens 10 also includes pins 11 (11A and 11B) protruding from the back surface 10B. These pins 11 A and 11 B are engaged with openings 21 (21 A and 21 B) formed in the mounting board 20 as shown in FIGS. 4A and 4B, whereby the lens 10 is attached to the mounting board 20.

More specifically, the

pins

11A and 11B are formed on the back surface 10B of the lens 10 so as to sandwich the accommodation recess DH. Specifically, the pin 11A is located on one end side in the elliptical long axis direction, and the pin 11B is located on the other end side in the elliptical long axis direction (note that the pin 11A and the pin 11B are dots). A symmetric relationship). These

pins

11A and 11B are a rectangular columnar shaft portion 12 (12A and 12B) extending so as to be separated from the back surface 10B of the lens 10, and a flexible portion formed near the tip of the shaft portion 12. (The locking piece 13 is a flexible piece protruding from the side wall of the shaft portion 12 in the vicinity of the tip of the shaft portion 12).

On the other hand, as shown in FIGS. 4A and 4B, the mounting board 20 has openings having a slightly similar shape to the shape of the

shafts

12A and 12B around the

shafts

12A and 11B (around the square shaft). 21A and 21B are formed so as to sandwich the LED 30. And pin 11A * 11B is inserted in these opening 21A * 21B. The

shaft portions

12A and 12B of the

pins

11A and 11B are slightly longer than the thickness of the mounting substrate 20, and the

openings

21A and 21B penetrate the mounting substrate 20. Therefore, when the

pins

11A and 11B are inserted into the

openings

21A and 21B, the tips of the

shaft portions

12A and 12B protrude from the back surface 20B of the mounting surface 20U.

In addition, in the process in which the

shaft portions

12A and 12B of the

pins

11A and 11B enter the

openings

21A and 21B, the locking

pieces

13A and 13B are pressed against the inner walls of the

openings

21A and 21B. Deforms to fit in 21A and 21B. However, when the tip ends of the

shaft portions

12A and 12B protrude from the back surface 20B of the mounting surface 20U, the locking

pieces

13A and 13B are not pressed against the inner walls of the

openings

21A and 21B, and thus are restored to their original shapes. Thereby, as shown in FIG. 2B, the locking pieces 13 A and 13 B are caught by the edges of the openings 21 A and 21 B, and the lens 10 is attached to the mounting substrate 20.

Next, the shape of the lens 10 will be described. The lens 10 has a curved lens surface (outgoing surface) 10S that transmits the light of the LED 30, and further in front view (specifically, when the XY plane direction defined by the X direction and the Y direction is viewed from the front), The lens surface 10S is elliptical. Further, like the lens surface 10S, the back surface 10B of the lens surface 10S is an ellipse when viewed from the front, but is flat and faces the mounting surface 20U of the mounting substrate 20.

In short, the outer edge 10E of the lens 10 is a rotationally symmetric and line-symmetric ellipse, the lens surface 10S is a curved surface, and the back surface 10B of the lens 10 is a plane. The lens surface 10S is an aspherical surface formed by a set of a plurality of points separated from the reference point by an arbitrary point at the center point of the ellipse inside the outer edge 10E of the lens 10. Including. However, the plurality of points forming the lens surface 10S have rotational symmetry with respect to the center point of the ellipse (also referred to as the central axis). As a result, the lens surface 10S has at least one of rotational symmetry and line symmetry. (In short, the lens surface 10S is not a free-form surface).

And this lens 10 contains the accommodation hollow DH which accommodates LED30 in the back surface 10B. As shown in FIG. 3C, the edge DHe of the housing dent DH serving as the entrance of the housing dent DH is located on the back surface 10B and has an irregular shape having a plurality of inflection points although it is annular. As the regular shape, for example, at least one of non-rotational symmetry and non-axisymmetric shape is given as an example).

And the inner surface DHn of the housing recess DH that receives the light of the LED 30 is designed as follows. First, an arbitrary point is set as a reference point inside the edge DHe of the annular housing recess DH. Then, an aspheric surface formed by a set of a plurality of points separated from the reference point by an arbitrary different distance is included in the inner surface DHn of the housing recess DH. In particular, at least some of the plurality of points forming the inner surface DHn do not have rotational symmetry based on a reference point (also referred to as a reference axis), and as a result, the inner surface DHn has non-rotational symmetry and non-linearity. It becomes at least one shape of symmetry.

With such a lens 10, the light incident from the inner surface DHn of the housing recess DH is affected by the aspherical surface (for example, a free-form surface) of the inner surface DHn, travels non-regularly, and then proceeds non-radially. The light emitted from the lens surface 10S (note that light that does not generate a radial (perfect circular) luminance distribution centered on the lens 10 is assumed to be non-radial light). Therefore, the transmitted light from such a lens 10 has no regularity (for example, light that generates a luminance distribution having a non-rotationally symmetric or axisymmetric shape around the lens 10 has no regularity. Light).

Then, when a plurality of LED sets ST including the lens 10 are arranged in the backlight unit 49, the light is excessively collected at a specific portion in the surface by the planar light (backlight light). , The light does not collect excessively in a specific part of the surface. Therefore, the light quantity unevenness is not included in the planar light (backlight light) from the backlight unit 49.

In particular, even if there is regularity in the arrangement of the LED sets ST, the transmitted light (diffused light) from each lens 10 proceeds non-radially, so that LED sets that emit similar diffused light have a matrix arrangement. Thus, the light interference unevenness (an example of the light amount unevenness) that occurs when the light is regularly arranged is not included in the planar light. Therefore, in other words, the lens 10 can be said to be a lens suitable for preventing the surface light from the backlight unit 49 from including light amount unevenness (interference unevenness or the like).

[Embodiment 2]
A second embodiment will be described. In addition, about the member which has the same function as the member used in Embodiment 1, the same code | symbol is attached and the description is abbreviate | omitted.

In the LED module MJ of Example 1 in Embodiment 1, the light emitted from the lens 10 has traveled irregularly because the inner surface DHn of the housing recess DH of the lens 10 includes an aspherical surface. However, in order to cause the transmitted light from the lens 10 to travel irregularly in this way, the inner surface DHn of the housing recess DH containing an aspherical surface is not always essential. For example, the LED module MJ of Example 2 (EX2) as shown in FIGS. 5A to 6C may be used.

5A to 5C are a front view, a cross-sectional view, and a rear view of the LED module MJ (note that the cross-sectional direction of the cross-sectional view is the direction of arrow A2-A2 'in FIG. 5A). 6A to 6C are a front view, a cross-sectional view, and a rear view of the lens 10 (note that the cross-sectional direction of the cross-sectional view is the direction of the arrow B2-B2 'in FIG. 6A).

The difference between the lens 10 of the LED module MJ of the second embodiment and the lens 10 of the LED module MJ of the first embodiment is the housing recess DH and the lens surface 10S. First, the accommodation recess DH will be described. In the LED module MJ of Example 2, the inner surface DHn of the housing recess DH is a hemispherical surface.

More specifically, as shown in FIG. 6C, the edge DHe of the housing recess DH is located on the back surface 10B, and has a regular shape, for example, a perfect circle shape, having rotational symmetry and line symmetry. The inner surface DHn of the housing recess DH is formed by a set of points that are equidistant from the center of the perfect circular edge DHe. For example, the inner surface DHn of the accommodation recess DH has a hemispherical shape having rotational symmetry and line symmetry.

Next, the lens surface 10S will be described. In the LED module MJ of Example 2, the lens surface 10S is aspheric. Specifically, as shown in FIG. 6C, the outer edge 10E of the lens 10 has an irregular shape having a plurality of inflection points although it is annular. An arbitrary point is set as a reference point inside the outer edge 10 E of the annular lens 10. The lens surface 10S includes an aspheric surface formed by a set of a plurality of points separated from the reference point by arbitrary different distances. In particular, at least some of the plurality of points forming the lens surface 10S do not have rotational symmetry based on the reference point, and as a result, the lens surface 10S has at least one of non-rotational symmetry and non-linear symmetry. It becomes the shape.

In the case of the LED module MJ of Example 2 as described above, light incident from the inner surface DHn of the housing recess DH is affected by the shape of the hemispherical surface of the inner surface DHn, and the inside of the lens 10 has regularity. proceed. However, the surface shape of the lens surface 10S does not have regularity. Therefore, the transmitted light from such a lens 10 has no regularity.

Then, similarly to the first embodiment, even if the lenses 10 covering the LEDs 30 are arranged in a matrix in the backlight unit 49 of the second embodiment, the uneven light quantity due to the arrangement is not included in the planar light. (Of course, the light amount unevenness other than the interference unevenness is not easily included in the planar light).

[Embodiment 3]
A third embodiment will be described. Note that members having the same functions as those used in

Embodiments

1 and 2 are denoted by the same reference numerals and description thereof is omitted.

In the first embodiment, the backlight unit 49 has a surface from the backlight unit 49 by mounting the LED module MJ to which the lens 10 having the inner surface DHn of the housing recess DH made aspherical (for example, a free curved surface) is mounted. Do not include unevenness in the amount of light. On the other hand, in the second embodiment, the backlight unit 49 has a planar shape from the backlight unit 49 by mounting the LED module MJ to which the lens 10 having the lens surface 10S aspherical (for example, a free-form surface) is mounted. Do not include unevenness in the amount of light.

That is, in the first and second embodiments, the lens surface 10S of the lens 10 or the inner surface DHn of the housing recess DH has an irregular shape, so that the transmitted light from the lens 10 travels in a non-radial manner without regularity. Was. However, the lens 10 that causes the transmitted light to travel in a non-radial manner without regularity is not limited thereto.

For example, the lens 10 included in the LED module MJ of Example 3 (EX3) as shown in FIGS. 7A to 8C may be used.

7A to 7C are a front view, a cross-sectional view, and a rear view of the LED module MJ (note that the cross-sectional direction of the cross-sectional view is the direction of arrow A3-A3 ′ in FIG. 7A). 8A to 8C are a front view, a cross-sectional view, and a rear view of the lens 10 (note that the cross-sectional direction of the cross-sectional view is the direction of the arrow B3-B3 'in FIG. 8A).

As shown in these drawings, in the LED module MJ of Example 3, the lens 10 is as follows. That is, the inner surface DHn of the housing recess DH in the lens 10 is set at an arbitrary point different from the reference point at an arbitrary point inside the edge DHe of the annular housing recess DH, as in the first embodiment. It includes an aspherical surface formed by a set of a plurality of distant points (in addition, the inner surface DHn has a shape of at least one of non-rotational symmetry and non-linear symmetry).

Similarly to the second embodiment, the lens surface 10S of the lens 10 has an arbitrary point as a reference point inside the outer edge 10E of the annular lens 10, and a plurality of points separated from the reference point by different arbitrary distances. It includes an aspheric surface formed by a set of points (note that the lens surface 10S has at least one of non-rotationally symmetric and non-axisymmetric shapes).

In the case of the LED module MJ of Example 3 as described above, light incident from the inner surface DHn of the housing recess DH is influenced by the shape of the aspheric surface of the inner surface DHn and travels in a non-radial manner without regularity. In addition, under the influence of the aspherical surface of the lens surface 10S, it proceeds more non-radially without regularity. Therefore, the transmitted light from such a lens 10 does not have regularity. Then, similarly to the first and second embodiments, even if the LED set ST is arranged in a matrix in the backlight unit 49 of the third embodiment, the light amount unevenness due to the arrangement is not included in the planar light. .

[Embodiment 4]
A fourth embodiment will be described. Note that members having the same functions as those used in the first to third embodiments are denoted by the same reference numerals and description thereof is omitted.

In Embodiments 1 to 3 (Examples 1 to 3), at least one of the outer edge 10E of the lens surface 10S of the lens 10 and the edge DHe of the housing recess DH is an annular shape having at least one of non-rotation symmetric and non-linear symmetry. Met.

However, the present invention is not limited to this. For example, a housing recess DH in the lens 10 such as a lens 10 shown in FIGS. 9A to 9C (an LED module MJ including the lens 10 is referred to as Example 4). The edge DHe may be rotationally symmetric and line symmetric. Further, as in the lens 10 shown in FIGS. 10A to 10C (the LED module MJ including the lens 10 is referred to as Example 5), the edge DHe of the housing recess DH in the lens 10 is axisymmetric. ("LA" in FIGS. 10A and 10C means an axis of line symmetry).

However, the edge DHe of the housing depression DH is a ring including a plurality of inflection points, for example, at least three inflection points. This is because if the ring has such an inflection point, the inner surface DHn of the housing recess DH is easily formed on an aspherical surface.

In addition, in such a lens 10, light passing through the inner surface DHn of the lens 10 has a regularity, but travels in a non-radial manner compared to light passing through a spherical inner surface (the inner surface of the lens 10). In the light passing through DHn, the number of directions in the traveling direction of light increases, for example, compared with the number of directions in the traveling direction of light in the light passing through the spherical inner surface.

Then, the LED module MJ including such a lens 10 (for example, the LED module MJ of the fourth and fifth embodiments) is, for example, compared with an LED module including a lens having a lens surface and a lens whose inner surface of the housing recess is a spherical surface. Advancing light in a non-radial manner. Therefore, for example, even in the backlight unit 49 in which the LED module MJ according to the fourth and fifth embodiments is mounted, even if the LED set ST is arranged in a matrix, unevenness in the amount of light caused by the arrangement is not planar. It becomes hard to be included in light.

Note that the outer edge 10E of the lens 10 may be annular including a plurality of inflection points (for example, at least three or more inflection points) in order to increase the number of directions in the light traveling direction. This is because the lens surface 10S is likely to be formed into an aspherical surface when it is an annular shape having such an inflection point.

Moreover, in such a lens 10, the light passing through the lens surface 10 S travels in a non-radial manner (passes through the lens surface 10 S), for example, compared to light passing through a spherical lens surface, although there is regularity. The number of directions in the traveling direction of light increases in comparison with the number of directions in the traveling direction of light, for example, in light passing through a spherical lens surface). Then, the LED module MJ including such a lens 10 has the same effect as the LED module MJ of the fourth and fifth embodiments. That is, even in the backlight unit 49 on which the LED module MJ is mounted, even if the LED sets ST are arranged in a matrix, the light amount unevenness due to the arrangement is not easily included in the planar light.

Of course, in the LED module MJ, the edge DHe of the housing recess DH may be an annulus including a plurality of inflection points, and the outer edge 10E of the lens 10 may be an annulus including a plurality of inflection points. In the case of such an LED module MJ, light incident from the inner surface DHn of the housing recess DH travels non-radially due to the influence of the shape of the aspheric surface of the inner surface DHn, and further the aspheric surface of the lens surface 10S. Advancing in a non-radial manner. That is, the backlight chassis 49 in which such an LED module is mounted has the same effect as described above.

[Other embodiments]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the LED module MJ described above, the LED 30 is housed in the housing recess DH of the lens 10, but is not limited thereto. For example, as shown in FIG. 11, the entire back surface 10B of the lens 10 may be a flat surface, and the LED 30 may be disposed immediately below the flat surface (in short, the LED 30 is housed in the housing recess DH of the lens 10). Not required).

In this case, the light from the LED 30 is incident on the back surface 10B, and the light is emitted from the lens surface 10S (in short, the entire area of the back surface 10B of the lens 10 is the light receiving surface). Then, if the lens surface 10S is an aspheric surface as in the second embodiment, the transmitted light from the lens 10 travels in various directions without regularity. That is, even if the lens 10 having an aspherical lens surface 10S without the housing dent DH covers the LED 30, the amount of light unevenness caused by the matrix arrangement of the LED set ST is added to the planar light from the backlight unit 49. Is not included.

That is, there are a case where the light from the LED 30 is received by the lens 10 in the housing recess DH which is a part of the back surface 10B and a case where the light is received by the flat back surface 10B having no housing recess DH. In short, a surface capable of receiving light in the lens 10 is a light receiving surface, and at least a part of the back surface 10B of the lens 10 is a light receiving surface.

In addition, in FIG. 11, although LED30 which has the planar light emission surface 30T and the back surface 10B of the lens 10 are closely_contact | adhered, there may be a case where it does not contact | adhere. 12, the size of the lens 10 may be a lens 10 having a back surface 10B having a smaller area than the light emitting surface 30T of the LED 30 (of course, the small lens 10 as shown in FIG. 12). LED 30 equipped with the LED set ST). 11 and 12, the LED 30 and the lens 10 that are in close contact may be referred to as an LED package (light emitting element package).

In consideration of the above, the lens 10 includes the following lens surfaces 10S and (2) (the light receiving surface is, for example, the inner surface DHn of the housing recess DH and the entire back surface 10B of the lens 10). At least one of them may be included.

(1) When the outer edge 10E on the lens surface 10S is annular and an arbitrary point inside the ring is a reference point, the lens surface 10S is formed by a set of a plurality of points separated by an arbitrary distance from the reference point. It is aspherical (however, the outer edge 10E on the lens surface 10S is an annulus including at least three inflection points).

(2) If the edge of the light receiving surface of the lens 10 is annular and an arbitrary point inside the ring is a reference point, the light receiving surface is formed by a set of a plurality of points separated by an arbitrary distance from the reference point. It is aspherical (however, the edge of the light receiving surface of the lens 10 is a ring including at least three inflection points).

In short, if at least one of the lens surface 10S of (1) and the light receiving surface of (2) is included in the lens 10, light from the lens 10 proceeds non-radially. Therefore, even if the LED set ST using such a lens 10 is arranged in a matrix, the light amount unevenness caused by the arrangement is not included in the planar light.

In addition, when a part of one place protrudes or becomes depressed at the annular outer edge 10E of the lens surface 10S of the lens 10, an inflection point is generated, and the number of the inflection points is three. Similarly, when a part of a certain portion protrudes or is depressed at the annular edge of the light receiving surface of the lens 10 (the outer edge 10E of the back surface 10B of the lens 10 or the edge DHe of the housing recess DH), an inflection point is obtained. And the number of inflection points is three.

Therefore, it is desirable that at least one of the annular outer edge 10E of the lens surface 10S of the lens 10 and the annular edge of the light receiving surface of the lens 10 is an annular shape including at least three or more inflection points (however, However, the present invention is not limited to this, and at least one inflection point may be included).

Further, in the lens 10, it is desirable that at least one of the outer edge 10E of the lens surface 10S and the edge of the light receiving surface is an annular shape in which at least one of non-rotational symmetry and non-linear symmetry is obtained.

This is because, in this case, the light from the lens 10 is not light that generates a radial luminance distribution centered on the lens 10, but is at least one of non-rotationally symmetric and non-linearly symmetric about the lens 10. The light produces a shaped luminance distribution. That is, light with no regularity is reliably emitted from the lens 10.

Further, it is desirable that the lens 10 has a diffusibility for diffusing transmitted light. If it becomes like this, the light of several LED30 will be mixed with a high degree and will become planar light. Therefore, due to the fact that the light from the lens 10 is not regular, the effect of not including unevenness in the amount of light in the planar light of the backlight unit 49 appears significantly.

In FIG. 13, the LED sets ST are arranged in a row on one mounting substrate 20, but the present invention is not limited to this, and for example, the LED sets ST may be arranged in a plurality of rows. LED sets ST may be arranged in a matrix on a single mounting board 10).

Further, the LED sets ST are regularly arranged in a matrix, but the present invention is not limited to this, and may be irregularly arranged {particularly in FIGS. 9A to 9C and 10A to 10C. Useful in LED module MJ (Example 4 and Example 5) including the lens 10 as shown}. In such a case, the surface light from the backlight unit 49 surely collects excessive light at a specific part in the surface, or does not collect excessive light at a specific part in the surface. I do not. Therefore, the planar light from the backlight unit 49 does not further include unevenness in the amount of light.

Further, the plurality of lenses 10 of the LED set ST mounted in the backlight unit 49 may include only the same type of lens surface 10S and light receiving surface. With such a configuration, the cost required for the lens 10 can be suppressed, and the cost of the LED module MJ, the backlight unit 49, and the liquid crystal display device 69 (mainly, various devices on which the lens 10 is mounted) can be reduced. However, it is not limited to this.

That is, in order to further prevent unevenness in the amount of light in the planar light from the backlight unit 49, a plurality of types of lenses 10 (for example, the surface shape of the lens surface 10S) having different diffusion directions of transmitted light are used. Different types of lenses 10) may be mounted on the backlight unit 49.

In the above description, the LED 30 that is a light-emitting element is used as the light source. However, the present invention is not limited to this. For example, it may be a light emitting element formed of a self-luminous material such as organic EL (Electro-Luminescence) or inorganic EL.

10 lens 10S lens surface (outgoing surface)
10B Rear side of lens (light receiving surface)
10E Outer edge of lens (edge of light receiving surface)
DH Housing recess DHn Inner recess inner surface (light receiving surface)
Edge of DHe housing recess (edge of light receiving surface)
11 pin 12 pin shaft portion 13 pin locking piece 20 mounting substrate 20U mounting surface 20B back surface of mounting surface 21 hole 30 LED (light emitting element)
30T LED light exit surface ST LED set (set)
MJ LED module (light emitting module)
41 Backlight chassis 41B Bottom surface of backlight chassis 42 Reflective sheet 43 Diffuser plate 44 Prism sheet 45 Microlens sheet 49 Backlight unit (lighting device)
59 Liquid crystal display panel (display panel)
69 Liquid crystal display device (display device)
89 LCD TV (TV receiver)

Claims

An exit surface for emitting transmitted light;
A light-receiving surface that is at least a part of the back surface of the emission surface and receives the light that is the basis of the transmitted light;
In the lens including
A lens including at least one of the following exit surface (1) and light-receiving surface (2).
(1) The edge of the exit surface is annular, and an arbitrary point inside the ring is used as a reference point, and the exit surface is formed by a set of a plurality of points separated by an arbitrary distance from the reference point. It includes an aspherical surface (however, the edge on the exit surface is an annulus including at least three inflection points).
(2) The edge of the light receiving surface is annular, and an arbitrary point inside the ring is used as a reference point, and the light receiving surface is formed by a set of a plurality of points separated by an arbitrary distance from the reference point. It includes an aspherical surface (however, the edge on the light receiving surface is a ring including at least three inflection points).
2. The lens according to claim 1, wherein at least one of an edge of the emission surface and an edge of the light receiving surface is an annular shape having at least one of non-rotational symmetry and non-linear symmetry.
3. The lens according to claim 1, wherein the light receiving surface is the entire back surface of the exit surface or the inner surface of a recess formed on the back surface of the exit surface.
The lens according to any one of claims 1 to 3, wherein the lens has diffusibility for diffusing the transmitted light.
A lens according to any one of claims 1 to 4,
A light emitting element for supplying light to the light receiving surface of the lens;
A mounting substrate to which the light emitting element and the lens are attached;
Including light emitting module.
A lens according to any one of claims 1 to 4,
A light emitting element for supplying light to the light receiving surface of the lens;
A light emitting device package that is closely attached.
A light emitting module including a mounting substrate on which the light emitting element package according to claim 6 is attached.
The light emitting module according to claim 5 or 7, wherein a plurality of sets of the lens and the light emitting element are regularly arranged.
A lighting device including one or a plurality of light emitting modules according to any one of claims 5, 7, and 8.
The lighting device according to claim 9;
A display panel that receives light from the lighting device;
Display device.
The display device according to claim 10, wherein the display panel is a liquid crystal display panel.
A television receiver equipped with the display device according to claim 10 or 11.