JP2008117666A - Light-emitting device and backlight device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting device which can be arranged close to an irradiated object and can restrain leakage of light generated at the gap between the light-emitting device and the irradiated object to a minimum. <P>SOLUTION: The light-emitting device is provided with a light-emitting element to emit light, a package member which has a depression portion defined by an aperture and a bottom face and in which the light-emitting element is mounted on the bottom face, a sealing resin part which is filled in the depression portion so as to cover the light-emitting element and made of a translucent resin, and a lens member which is installed in the sealing resin part so that a part may be embedded in the sealing resin part and becomes an outgoing face of the light emitted from the light-emitting element. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light emitting device and a backlight device using the same, and more particularly to an edge light type light emitting device used in a backlight or a front light.

Conventionally, a backlight or a front light is used as a light source of various display devices. Among these, the backlight is comprised as a surface light source which illuminates the whole back surface of a transmissive liquid crystal display device, for example.
In applications where a thin display device is required, the light guide plate and the light emitting device are juxtaposed so that the end face of the light guide plate and the exit surface of the surface mount light emitting device (hereinafter referred to as light emitting device) face each other. An edge light type backlight is generally used.
And the light emitted from the LED chip accommodated in the light emitting device is made incident from the end face of the flat light guide plate, and the surface of the light guide plate is formed by a gradation pattern such as a dot shape provided on the inner surface of the light guide plate or the reflection plate. The light is emitted uniformly from the whole.

  Further, the front light is configured as an edge light type surface light source for illuminating the reflective liquid crystal display device, for example, and the light from the LED chip is made incident from the end surface of the flat light guide plate, so that the reflective liquid crystal display device or the like is made. Illumination is performed from the front side, and the reflected light is transmitted through the light guide plate and emitted toward the front of the display device.

By the way, in the above-described edge light type backlight and front light, a side view type light emitting device is often used as a light source.
As such a side view type light-emitting device, a device provided with a reflector (first conventional example) for efficiently making light incident on an end face of a light guide plate as shown in Patent Document 1, or Patent Document 2 A device (second conventional example) provided with a lens-shaped sealing resin portion for allowing light to efficiently enter the end face of a light guide plate as shown in the drawing is disclosed.

  The configuration of the light emitting device 101 according to the first conventional example will be described with reference to FIGS. 16 and 17. 16A and 16B are explanatory views showing the structure of the light emitting device according to the first conventional example. FIG. 16A is a cross section in the Y direction, FIG. 16B is a cross section in the X direction, and FIG. Each plane is shown from the direction. FIG. 17 is an explanatory view showing a state in which light emitted from the light emitting device according to the first conventional example enters the light guide plate, and FIG. 17A shows light emitted from the light emitting device on the end face of the light guide plate. FIG. 17B illustrates a state in which light is emitted from the light emitting device and is incident in the X direction (width direction) of the end face of the light guide plate.

As shown in each drawing of FIG. 16, a light emitting device 101 according to a first conventional example includes an LED chip (hereinafter referred to as a chip) 102 and a package member 103 in which a hollow portion 103 a that houses the chip 102 is formed. And a sealing resin portion 104 made of a translucent resin that fills the depression 103 a and seals the chip 102.
The depression 103a has a side wall 103d that is inclined so that the opening area gradually increases from the edge of the bottom surface 103c toward the edge of the opening 103b so that the light emitted from the chip 102 is emitted radially. Yes.

The chip 102 is placed on the bottom surface 103c of the recess 103a, and is electrically connected to the cathode electrode 106a and the anode electrode 106b by wires 107a and 107b, respectively.
The sealing resin portion 104 made of a translucent resin filled in the depression 103a forms a flat emission surface 104a.

As shown in each drawing of FIG. 17, when a driving voltage is applied to the light emitting device 101, the chip 102 (see FIG. 16) emits light, and this light is in the Y direction (thickness direction) of the end face of the light guide plate 100. Radially emitted in the X direction (width direction).
The light emitting device 101 according to the first conventional example has wide directional characteristics in which the full width at half maximum in the X direction and the Y direction are both 110 degrees to 120 degrees.
In particular, since the directional characteristics in the X direction are wide, when a plurality of light emitting devices 101 are arranged along the end face of the light guide plate 100 as shown in FIG. In this case, the emitted light sufficiently wraps around each other, so that the occurrence of luminance unevenness in the X direction of the light guide plate 100 is suppressed.

  The configuration of the light emitting device 201 according to the second conventional example will be described with reference to FIGS. 18A and 18B are explanatory views showing the structure of a light emitting device according to a second conventional example. FIG. 18A is a cross section in the Y direction, FIG. 18B is a cross section in the X direction, and FIG. Each plane is shown from the direction. FIG. 19 is an explanatory view showing a state in which light emitted from the light emitting device according to the second conventional example is incident on the light guide plate. FIG. 19A shows light emitted from the light emitting device of the light guide plate. FIG. 19B shows a state in which the light emitted from the light emitting device enters the X direction (width direction) of the end surface of the light guide plate.

  As shown in each drawing of FIG. 18, a light emitting device 201 according to a second conventional example includes an LED chip (hereinafter referred to as a chip) 202, a substrate 203 made of glass epoxy, and the like, and wraps around from the upper surface to the lower surface of the substrate 203. The cathode electrode 206a, the anode electrode 206b, and the sealing resin portion 204 made of a translucent resin molded so as to function as a lens by sealing the chip 202 are mainly configured.

The chip 202 is fixed on the cathode electrode 206a by an insulating adhesive or a conductive adhesive, and is electrically connected to the cathode electrode 206a and the anode electrode 206b by wires 207a and 207b, respectively.
The sealing resin portion 204 functioning as a lens is a rectangle extending with a predetermined width in the X direction in plan view as shown in FIG. 18C, but in the Y direction as shown in FIG. In the cross section, an upwardly convex curve Sr is exhibited, and as shown in FIG. 18C, an upwardly convex parabola Sh is exhibited in the X-direction cross section. Such a sealing resin portion 204 is formed by molding. The curve Sr is set so that the average curvature is larger than the average curvature of the parabola Sh.

As shown in FIG. 19A, when the driving voltage is applied to the light emitting device 201 and the chip 202 emits light, the light that has reached the curve Sr with a large curvature among the light emitted from the chip 202 is transmitted therethrough. At this time, the light is refracted greatly and is condensed inside the spontaneous light emission state of the chip 202, and efficiently enters the Y direction (thickness direction) of the end face of the light guide plate 100 without waste.
Further, as shown in FIG. 19B, among the light emitted from the chip 202, the light that has reached the parabola Sh is refracted when passing therethrough, and the optical path is upward from the spontaneous light emission state of the chip 202. It is changed and efficiently enters the X direction (width direction) of the end face of the light guide plate 100.
As described above, in the light emitting device 201 according to the second conventional example, the light path is changed so that the light emitted from the chip 202 is condensed to a narrow width in the Y direction and has a sufficient length in the X direction. Therefore, the incident efficiency with respect to the light guide plate 100 and the uniformity of luminance are excellent.

JP 2004-193537 A JP 2003-124522 A

  The light emitting device according to the first conventional example has wide directivity characteristics in both the X direction and the Y direction. A wide directional characteristic in the X direction can be said to have an advantageous effect on making light incident efficiently in the width direction of the light guide plate end face, but a wide directional characteristic also in the Y direction is relative to the thickness direction of the light guide plate end face. Therefore, many light components that are wasted in making light incident efficiently act disadvantageously.

On the other hand, in the light emitting device according to the second conventional example, the light emitted from the chip is condensed to a narrow width in the Y direction, and the optical path is changed so as to have a sufficient length in the X direction. Light can be incident on the light guide plate relatively efficiently.
However, since a complicated lens shape is required in which the average curvature of the curve represented by the Y-direction cross section is larger than the average curvature of the parabola represented by the X-direction cross section, such a complicated lens shape is mass-produced with high dimensional accuracy. Difficult to do.
For this reason, when arranging a plurality of light-emitting devices side by side along the end surface of the light guide plate, the light-emitting device is used to avoid occurrence of luminance unevenness due to interference (contact) between some light-emitting devices and the end surface of the light guide plate. The clearance must be set with a certain margin between the light exit surface and the end surface of the light guide plate, and light leaks from the gap formed by the clearance. This means that there is still room for improvement in terms of incident efficiency with respect to the light guide plate.

  The present invention has been made in view of the above circumstances, and the light emitting device can be disposed close to the object to be irradiated, and light leakage caused by the gap between the light emitting device and the object to be irradiated can be minimized. Provided is a light-emitting device that can be used.

  The present invention includes a light emitting element that emits light, a package member that has a recess defined by an opening and a bottom surface, and on which the light emitting element is mounted, and the recess is filled to cover the light emitting element. Provided is a first light emitting device comprising: a sealing resin portion made of a translucent resin; and a lens member that is provided so as to be partially embedded in the sealing resin portion and serves as an emission surface of light emitted from the light emitting element. Is.

  The present invention also includes a light emitting element that emits light, a substrate on which the light emitting element is mounted, a sealing resin portion made of a translucent resin molded on the substrate so as to cover the light emitting element, and a sealing resin portion A second light emitting device comprising: a reflecting member standing at least at a part of the periphery of the lens; and a lens member that is provided so as to be partially buried in the sealing resin portion and serves as an emission surface of light emitted from the light emitting element It is also what provides.

According to the first and second light emitting devices according to the present invention, the lens member that becomes the light emission surface of the light emitted from the light emitting element is provided so as to be partially embedded in the sealing resin portion that covers the light emitting element. The protrusion of the member is suppressed. For this reason, the light emitting device can be disposed close to the object to be irradiated, and light leakage caused by the gap between the light emitting device and the object to be irradiated can be minimized.
When the object to be irradiated is a light guide plate, the first and second light emitting devices according to the present invention are arranged close to the end surface of the light guide plate with the minimum necessary clearance, so that the light emitting device and the light guide plate are arranged. It is possible to minimize light leakage caused by a gap with the end face of the light source, and to increase the incident efficiency with respect to the light guide plate.

  A first light emitting device according to the present invention covers a light emitting element that emits light, a package member that has a recess defined by an opening and a bottom surface, and on which the light emitting element is mounted, and covers the light emitting element. A sealing resin portion made of a translucent resin filled in the hollow portion, and a lens member which is provided so as to be partially embedded in the sealing resin portion and serves as an emission surface of light emitted from the light emitting element. Features.

  A second light emitting device according to the present invention includes a light emitting element that emits light, a substrate on which the light emitting element is mounted, a sealing resin portion made of a translucent resin that is molded on the substrate so as to cover the light emitting element, A reflecting member standing on at least a part of the periphery of the sealing resin part; and a lens member that is provided so as to be partially embedded in the sealing resin part and serves as an emission surface of light emitted from the light emitting element. It is characterized by.

In the first and second light emitting devices according to the present invention, the light emitting element may be any element that emits light, and the form thereof is not particularly limited, and examples thereof include an LED chip.
Since the LED chip consumes little power and has a long life, it is suitable as the light emitting element of the first and second light emitting devices according to the present invention.
Examples of the LED chip include an infrared LED chip containing gallium arsenide, a red LED chip containing gallium / aluminum arsenic, an orange LED chip or yellow LED chip containing gallium arsenide phosphorus, and a yellow doped gallium phosphorus with nitrogen. A green LED chip, a blue or blue-violet LED chip containing a gallium nitride compound, and the like can be used.

In the first light emitting device according to the present invention, the package member may be any member as long as it has a recess defined by the opening and the bottom surface and functions as a housing of the light emitting device. It is not limited.
The package member may be formed of any metal such as aluminum and stainless steel having excellent heat dissipation, a resin material having excellent workability and cost, or ceramic.
When the package member is made of a resin material, for example, a heat-resistant resin such as a polyimide resin, a modified polyimide resin, a polyetherketone containing a reinforcing material, or a polyphenylene sulfide containing a reinforcing material is used as the resin material. it can.

  In the second light emitting device according to the present invention, the substrate is not particularly limited as long as the light emitting element can be mounted. For example, a glass epoxy resin substrate having excellent heat resistance is used. be able to.

  In the first and second light emitting devices according to the present invention, as the translucent resin covering the light emitting element, for example, a translucent resin having excellent weather resistance such as an epoxy resin, a silicon resin, or a polyimide resin can be used. .

  In the first and second light emitting devices according to the present invention, the lens member may be any member that refracts the light emitted from the light emitting element to give the desired directivity and emits it from the light emitting device. Although the form is not particularly limited, for example, a spherical, hemispherical or cylindrical shape that is easy to manufacture and excellent in dimensional accuracy can be used.

In the first light emitting device according to the present invention, the lens member is preferably arranged so as not to protrude from the opening of the recess.
In the second light emitting device according to the present invention, the lens member is preferably arranged so as not to protrude from the upper edge of the reflecting member.

According to these configurations, since the lens member does not protrude from the light emitting device at all, the light emitting device can be disposed as close as possible to the irradiated object such as a light guide plate, and the light emitting device and the irradiated object It is possible to further minimize light leakage from the gap caused by the clearance.
As a result, for example, when the first and second light emitting devices according to the present invention are used as the light source of the light guide plate, the light emitting device having the above configuration is arranged as close as possible to the end face of the light guide plate, thereby emitting light. Light emitted from the apparatus can be incident on the light guide plate more efficiently without waste, and the incident efficiency can be further improved.

In the first light emitting device according to the present invention, a holding portion for positioning and holding the lens member may be formed in a part of the recess.
According to such a configuration, since the holding portion for positioning and holding the lens member is formed in a part of the recess portion, the lens member can be easily positioned with respect to the package member, and the lens member with respect to the package member can be easily positioned. High positional accuracy can be secured. As a result, it is possible to provide a light emitting device having stable quality with little variation in directivity.

In the second light emitting device according to the present invention, the sealing resin portion and the lens member may be integrally formed of a translucent resin.
According to such a configuration, since the sealing resin portion and the lens member are integrally formed of the translucent resin, not only the manufacturing process is simplified, but also the boundary between the sealing resin portion and the lens member. Since there is no surface, Fresnel loss can be eliminated.
Furthermore, there is no possibility that the lens member is peeled off from the sealing resin portion, and the reliability of the light emitting device is improved.

In the first and second light emitting devices according to the present invention, the sealing resin portion may contain a phosphor.
According to such a configuration, the phosphor contained in the sealing resin portion is excited by the light emitted from the light emitting element, and emits light having a wavelength different from that of the light emitted from the light emitting element. Light of various colors can be emitted.

For example, when an LED chip that emits blue light is used as the light emitting element, and a phosphor that emits yellow light when excited by blue light is used as the phosphor, the blue light emitted from the LED chip and the phosphor are emitted from the phosphor. The yellow light is mixed, and white light can be emitted.
As a result, the light emitting device can emit white light controlled to have a desired directional characteristic. For example, when the irradiated object illuminated by the light emitting device is a light guide plate, the white light is efficiently guided. It becomes possible to make it enter into an optical plate, and it becomes more suitable as a light source of a light-guide plate.
The method for obtaining white light is not limited to the combination of the above-described LED chip that emits blue light and the phosphor that emits yellow light, but the LED chip that emits blue light and the fluorescence that emits red light. And a phosphor that emits green light, an LED chip that emits ultraviolet light, a phosphor that emits red light, a phosphor that emits green light, and a phosphor that emits blue light. It is also possible to combine them.

  As phosphors, as substrates, oxides of rare earth elements such as zinc, cadmium, magnesium, silicon, yttrium, inorganic phosphors such as sulfides, silicates, vanadates, or fluorescein, eosin, oils (minerals) Selected from organic fluorescent materials such as oil, silver, copper, manganese, chromium, eurobium, zinc, aluminum, lead, phosphorus, arsenic, gold, etc. as activators, sodium chloride, potassium chloride as fluxes , Selected from magnesium carbonate, barium chloride, and the like can be used.

In the above configuration in which the sealing resin portion contains a phosphor, the phosphor may be layered on the surface of the light emitting element.
According to such a configuration, since the phosphor is layered on the surface of the light emitting element, the excitation action of the phosphor is efficiently performed.
In addition, since the excitation action of the phosphor is performed near the surface of the light emitting element, the scattered light component that is difficult to control the directivity in the sealing resin portion is reduced, and the directivity control by the lens member can be easily performed. .
Of course, this configuration is more suitable when the irradiated object is a light guide plate, for example.

In the first and second light emitting devices according to the present invention, the sealing resin portion and the lens member may have substantially the same refractive index.
According to such a configuration, reflection due to a difference in refractive index hardly occurs at the boundary surface between the sealing resin portion and the lens member, and light amount loss due to Fresnel reflection and light amount loss due to light confinement are unlikely to occur. As a result, light can be efficiently emitted from the light emitting device.
As a result, for example, when the object to be irradiated is a light guide plate, light emitted from the light emitting element can be incident on the light guide plate more efficiently without waste, and the incident efficiency can be further improved. .

In the first and second light emitting devices according to the present invention, the lens member may be a cylindrical rod lens.
According to such a configuration, the light emitted from the light emitting element is emitted in a wide directivity angle without being refracted by the rod lens in the X direction (longitudinal direction of the rod lens), and in a narrow range in the Y direction. The beam is emitted with a narrowed directivity angle.
Thus, for example, when the first and second light emitting devices according to the present invention are arranged side by side on the end face of the light guide plate, light having a wide directivity angle is emitted in the X direction (width direction) of the end face of the light guide plate. While suppressing unevenness in brightness between devices, light with a sufficiently narrow directivity angle in the Y direction (thickness direction) of the light guide plate end face can be efficiently incident without waste.
In addition, since the rod lens as a lens member has a simple cylindrical shape, it can be easily mass-produced with high dimensional accuracy. By using a rod lens with excellent dimensional accuracy as a lens member, dimensional accuracy and directivity accuracy It is possible to provide a high-quality light-emitting device that is superior to the above.
The rod lens can be manufactured, for example, by a technique similar to that of an optical fiber using a glass material.

In the above configuration in which the lens member is a cylindrical rod lens, the rod lens is disposed so as to lie on the surface of the sealing resin portion, and has a diameter such that substantially the entire area of the surface of the sealing resin portion is occupied by the rod lens. You may have.
According to such a configuration, since almost the entire region of the surface of the sealing resin portion is occupied by the rod lens, most of the light emitted from the light emitting element can be incident on the rod lens. Thereby, most of the light emitted from the light emitting element can be emitted after being controlled to have a desired directivity characteristic.

In the first and second light emitting devices according to the present invention, the light emitting element may be a flip chip type light emitting element.
According to such a configuration, since a wire for electrically connecting the light emitting element is not necessary, the thickness of the sealing resin portion for sealing the light emitting element can be set thin, and as a result, the light emitting device Thinning can be achieved.

  From another point of view, the present invention provides a backlight device including a light emitting device as a light source, wherein the light emitting device comprises the first or second light emitting device according to the present invention described above. But there is.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

Embodiment 1
A light emitting device according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 is a perspective view of a light emitting device according to Embodiment 1 of the present invention, FIG. 2 is an explanatory view showing the structure of the light emitting device shown in FIG. 1, FIG. 2 (a) is a cross section in the Y direction, and FIG. ) Shows a cross section in the X direction, and FIG. 2C shows a plane viewed from the Z direction. FIG. 3 is an explanatory diagram illustrating a state in which light emitted from the light emitting device according to the first embodiment is incident on the light guide plate. FIG. 3A illustrates the light emitted from the light emitting device in the Y direction on the end surface of the light guide plate. FIG. 3B shows a state in which light emitted from the light emitting device is incident in the X direction (width direction) of the end face of the light guide plate.

  As shown in FIGS. 1 and 2, a light emitting device 1 according to Embodiment 1 of the present invention includes an LED chip (light emitting element) (hereinafter referred to as “chip”) 2 that emits blue light, and an opening. 3b, a bottom surface 3c, and a package member 3 having a recess 3a defined by a side wall 3d extending from the bottom surface 3c to the opening 3b and the chip 2 placed on the bottom surface 3c, and a recess so as to cover the chip 2 A sealing resin portion 4 made of a translucent resin filled in the portion 3a, and a cylindrical rod lens that is provided so as to be partially buried in the sealing resin portion 4 and serves as an emission surface of light emitted from the chip 2 (Lens member) 5 and mainly.

As shown in FIGS. 2A and 2B, the package member 3 is formed of a resin having excellent weather resistance such as polyimide resin, and the side wall 3d of the recess 3a has a bottom surface in both the X direction and the Y direction. Inclination is performed so that the opening area gradually increases from 3c to the opening 3b.
The inclined side wall 3d acts so that the light emitted from the chip 2 is incident on the entire area of the rod lens 5 in the longitudinal direction. The side wall 3d may be provided with reflectivity by making the package member 3 itself white, or the reflectance may be increased by forming a reflective layer such as a metal reflective film on the surface of the side wall 3d. It may be configured.

As shown in FIG. 1 and FIGS. 2B and 2C, a cathode electrode 6a and an anode electrode 6b for supplying power to the chip 2 are formed on the bottom surface 3c of the recess 3a. Has been.
The chip 2 is fixed on the cathode electrode 6a by an insulating adhesive (not shown), and the cathode and anode (not shown) are connected to the cathode electrode 6a and the anode electrode 6b by a metal such as aluminum, copper or gold. Are connected by wires 7a and 7b.

A sealing resin portion 4 made of a translucent resin such as silicon resin is formed in the hollow portion 3a up to the middle of the side wall 3d extending to the opening 3b so as to cover the chip 2 and the wires 7a and 7b. The rod lens 5 is locked to the inclined side wall 3d. In the sealing resin portion 4, phosphors 8 that are excited by blue light emitted from the chip 2 and emit yellow light are dispersed and mixed. Since the rod lens 5 is made of glass and has a simple shape such as a cylindrical shape, it can be easily mass-produced with high dimensional accuracy.
When a voltage is applied between the cathode electrode 6a and the anode electrode 6b, blue light is emitted from the chip 2. Part of the blue light emitted from the chip 2 excites the yellow phosphor 8 dispersed and mixed in the sealing resin portion 4, and the excited phosphor 8 emits yellow light.
As a result, the blue light emitted from the chip 2 is mixed with the blue light that has not acted on the excitation of the phosphor when it enters the rod lens 5 and the yellow light emitted from the excited phosphor. It becomes light.

As shown in FIGS. 2A and 2B, the opening 3b of the recess 3 has a width W1 that approximates the diameter R1 of the rod lens 5 and is slightly larger than the diameter R1 of the rod lens 5. The rod lens 5 has a length L2 that is slightly longer than the length L1 in the longitudinal direction.
The rod lens 5 is arranged so that its longitudinal direction is parallel to the length direction of the opening 3b, and its lower half in the diameter direction (direction perpendicular to the longitudinal direction) is buried in the sealing resin portion 4 and sealed. It is fixed to the package member 3 by the stop resin portion 4.
2, in the state where the lower half in the diameter direction of the rod lens 5 is disposed so as to be buried in the sealing resin portion 4, the opening 3b of the recess 3a is a rod. The lens 5 is substantially closed, and the edge of the opening 3b and the top of the rod lens 5 in the diameter direction are located at the same height.
That is, the inclination angle of the side wall 3d extending from the bottom surface 3c to the opening 3b is such that the top in the diameter direction of the rod lens 5 is located at the same height as the edge of the opening 3b and is buried in the sealing resin portion 4. The lower portion of the rod lens 5 is set so as not to contact the wires 7a and 7b.

  With such a configuration, as shown in FIGS. 1, 2 (a), and 2 (b), the rod lens 5 is accommodated in the recess 3 a and does not protrude from the package member 3 at all.

For this reason, as shown in each drawing of FIG. 3, the light emitting device 1 can be disposed close to the end surface of the light guide plate 100 with a minimum necessary clearance, and from the gap between the light guide plate 100 and the light emitting device 1 generated by the clearance. It is possible to minimize the light leakage that occurs.
Furthermore, since the cylindrical rod lens 5 is used, as shown in FIG. 3B, the X direction (width direction) of the light guide plate 100 is not directed to be refracted by the rod lens 5. Can emit white light with a corner, and can emit white light with a directional angle narrowed to a narrow range due to a large refraction effect in the Y direction (thickness direction) of the light guide plate 100 as shown in FIG. It is possible to control the directivity to be very excellent in terms of the incident efficiency with respect to the light guide plate 100.

  In addition, when mass-producing light emitting devices, it is important to stably ensure the dimensional accuracy and directivity accuracy of the light emitting device, but the light emitting device 1 according to Embodiment 1 of the present invention is as described above. Since the glass rod lens 5 capable of mass production with high dimensional accuracy is used, the dimensional accuracy and the accuracy of the directivity can be secured stably.

This is a great advantage when a backlight device is configured using the light-emitting device 1 that is mass-produced.
Although not shown, in the backlight device, a plurality of light emitting devices are mounted side by side on a flexible printed circuit board (FPC), and the light emitting surfaces of the plurality of light emitting devices mounted on the FPC face the end surface of the light guide plate. It is comprised by arranging in this way.
At this time, in the conventional light emitting device with a lens, in the plurality of light emitting devices, the lenses of some of the light emitting devices do not interfere with the end face of the light guide plate and cause uneven brightness. In consideration of an error in the dimensional accuracy of the lens, a clearance must be set between the FPC on which the light emitting device is mounted and the end face of the light guide plate with a certain margin. Light leakage from the gap generated by the clearance is not small. This has been an obstacle to improving the incidence efficiency.

However, in the light emitting device 1 according to Embodiment 1 of the present invention, the rod lens 5 does not protrude from the package member 3 as described above, and the dimensional accuracy is excellent. It can be arranged on the end face with a minimum required clearance, and light leakage from the gap caused by this clearance can be minimized.
Further, since the dimensional accuracy is excellent, the positioning accuracy to the FPC can be relaxed depending on the set clearance.

Embodiment 2
A light emitting device according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 4 is an explanatory view showing the structure of a light emitting device according to Embodiment 2 of the present invention. FIG. 4 (a) is a cross section in the Y direction, FIG. 4 (b) is a cross section in the X direction, and FIG. The planes viewed from the Z direction are shown. The same members as those used in the first embodiment will be described with the same reference numerals.

4, particularly FIG. 4B, the light emitting device 21 according to the second embodiment positions and holds the rod lens 5 on a part of the side wall 23 d extending in the Y direction of the recess 23. A holding portion 29 formed in a stepped shape is formed.
By forming the holding portion 29, the positioning of the rod lens 5 is facilitated, and the lower portion of the rod lens 5 can be reliably prevented from coming into contact with the wires 7a and 7b.

Further, the position of the top of the rod lens 5 in the diameter direction depends on the positional relationship between the length L1 of the rod lens 5 and the inclined side wall 3d as shown in FIG. Instead of being determined, it is determined by the height of the holding portion 29 formed on the side wall 23d as shown in FIG.
For this reason, even if the length L1 of the rod lens 5 slightly varies due to an error, the top of the rod lens 5 does not protrude from the edge of the opening 23b of the package member 23, and the edge of the opening 23b of the package member 23 The top of the rod lens 5 in the diameter direction can always be positioned at the same height.
Other configurations are the same as those of the light-emitting device 1 according to Embodiment 1 described above.

Embodiment 3
A light emitting device according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 5 is an explanatory view showing the structure of a light emitting device according to Embodiment 3 of the present invention. FIG. 5 (a) is a cross section in the Y direction, FIG. 5 (b) is a cross section in the X direction, and FIG. The planes viewed from the Z direction are shown. The same members as those used in the first embodiment will be described with the same reference numerals.

As shown in each drawing of FIG. 5, particularly FIG. 5C, in the light emitting device 31 according to the third embodiment, the holding portion 39 has a U-shaped cross section that follows the shape of the peripheral surface of the rod lens 5. The holding portion 39 extends in the X direction and penetrates from the inner wall to the outer wall of the side wall 33d.
The rod lens 5 has a U-shaped cross section and is positioned so as to fit into a holding portion 39 extending in the X direction.
For this reason, in the light emitting device 31 according to the third embodiment, the tolerance for the error variation of the length L1 of the rod lens 5 is further increased than that in the second embodiment.

The rod lens 5 can be obtained by cutting a long rod-like object into a predetermined length. However, in practice, it is quite difficult to accurately cut into a predetermined length, and the cut surface is in a rough state. It is difficult to obtain desired optical characteristics at both ends of the rod lens 5.
For this reason, it is preferable that the rod lens 5 is cut to a certain length and both ends thereof are held by the holding portions 39 that do not affect the optical characteristics, and the form according to the third embodiment is as described above. This is very useful when the rod lens 5 cut long is used for the reason.

  In the light emitting device 31 according to the third embodiment, since the holding portion 39 having a U-shaped cross section passes through from the inner wall to the outer wall of the side wall as described above, leakage of the translucent resin at the time of manufacture is prevented. In order to prevent this, it is preferable to temporarily close the outside of the side wall 33d on which the holding portion 39 is formed with a jig or the like. And it is preferable to form the sealing resin part 4 by inject | pouring translucent resin, mounting the rod lens 5 on the holding | maintenance part 39, and removing a jig | tool etc. after translucent resin hardens | cures.

  In addition, when the rod lens 5 is placed on the holding portion 39, a translucent resin remains between the surface of the holding portion 39 and the peripheral surface of the rod lens 5, and the rod lens depends on the thickness of the remaining translucent resin. The rod lens 5 is firmly pressed against the holding portion 39 so that the translucent resin is pushed out as much as possible so that the top in the diameter direction of 5 does not protrude from the edge of the opening 33b of the package member 33. It is preferable to make it.

Although not shown, leakage of the translucent resin may be prevented by making the holding portion 39 not penetrate the side wall 33d.
About another structure, it is the same as that of the light-emitting device 1 which concerns on the above-mentioned Embodiment 1. FIG.

Embodiment 4
A light-emitting device according to Embodiment 4 of the present invention will be described with reference to FIG. FIG. 6 is an explanatory view showing the structure of a light emitting device according to Embodiment 4 of the present invention. FIG. 6 (a) is a cross section in the Y direction, FIG. 6 (b) is a cross section in the X direction, and FIG. Each plane is shown from the direction. The same members as those used in the first embodiment will be described with the same reference numerals.

As shown in each drawing of FIG. 6, particularly FIG. 6A, the light emitting device 41 according to Embodiment 4 is formed so that the holding portion 49 has a rectangular cross section.
Therefore, similarly to the light emitting device 31 according to the above-described third embodiment (see FIG. 5), not only is the tolerance for the error variation of the length L1 of the rod lens 5 high, but the holding portion 49 has a rectangular cross section. Therefore, the formation of the holding portion 49 itself is easy.
Further, since the contact portion between the holding portion 49 and the rod lens 5 is only three linear portions on the peripheral surface of the rod lens 5, a translucent resin is formed at the contact portion between the holding portion 49 and the rod lens 5. There is also an advantage that it does not remain easily.

However, as in the third embodiment, it is preferable to inject a translucent resin that forms the sealing resin portion 4 while closing the outside of the side wall 43d where the holding portion 49 is formed with a jig or the like. Although not shown, the holding portion 49 may be configured not to penetrate the side wall 43d in order to prevent leakage of the translucent resin.
Other configurations are the same as those of the light-emitting device 1 according to Embodiment 1 described above.

Embodiment 5
A light-emitting device according to Embodiment 5 of the present invention will be described with reference to FIG. FIG. 7 is an explanatory view showing the structure of a light emitting device according to Embodiment 5 of the present invention. FIG. 7 (a) is a cross section in the Y direction, FIG. 7 (b) is a cross section in the X direction, and FIG. The planes viewed from the Z direction are shown. The same members as those used in the first embodiment will be described with the same reference numerals.

As shown in each drawing of FIG. 7, particularly FIG. 7A, the light emitting device 51 according to the fifth embodiment is formed so that the holding portion 59 has a V-shaped cross section.
For this reason, not only is the tolerance for the error variation of the length l1 of the rod lens 5 high as in the light emitting device 31 (see FIG. 5) according to the third embodiment described above, but also the error variation of the diameter r1 of the rod lens 5 is increased. The tolerance is also increased.
Further, similarly to the above-described fourth embodiment, there is an advantage that the translucent resin hardly remains at the contact portion between the holding portion 59 and the rod lens 5.

However, it is preferable to inject the translucent resin for forming the sealing resin portion 4 while closing the outside of the side wall 53d where the holding portion 59 is formed with a jig or the like in the same manner as in the third embodiment. In addition, although not shown, in order to prevent leakage of the translucent resin, the holding portion 59 may be configured not to penetrate the side wall 53d.
Other configurations are the same as those of the light-emitting device 1 according to Embodiment 1 described above.

Embodiment 6
A light-emitting device according to Embodiment 6 of the present invention will be described with reference to FIG. FIG. 8 is an explanatory view showing the structure of a light emitting device according to Embodiment 6 of the present invention. FIG. 8 (a) is a cross section in the Y direction, FIG. 8 (b) is a cross section in the X direction, and FIG. The planes viewed from the Z direction are shown. The same members as those used in Embodiment 1 will be described using the same reference numerals.

As shown in each drawing of FIG. 8, particularly FIG. 8B, in the light emitting device 61 according to the sixth embodiment, the chip 62 emitting a flip chip type blue light emitting element is used as the cathode electrode 66a and the anode electrode 66b. It is mounted so as to straddle both electrodes.
Therefore, the wires 7a and 7b for electrically connecting the tip 2, the cathode electrode 6a and the anode electrode 6b as shown in FIG. 2 are not necessary, and the distance between the tip 62 and the rod lens 5 is set small. Thus, the light emitting device 61 can be thinned.
Other configurations are the same as those of the light-emitting device 1 according to Embodiment 1 described above.

Embodiment 7
A light emitting device according to Embodiment 7 of the present invention will be described with reference to FIGS. 9 is a perspective view of a light-emitting device according to Embodiment 7 of the present invention, and FIG. 10 is an explanatory view showing the structure of the light-emitting device shown in FIG. 9, showing the structure of the light-emitting device according to Embodiment 7 of the present invention. FIG. 10A shows a cross section in the Y direction, FIG. 10B shows a cross section in the X direction, and FIG. 10C shows a plane viewed from the Z direction. The same members as those used in the first embodiment will be described with the same reference numerals.

  9 and 10, the light emitting device 71 according to the seventh embodiment covers a chip (light emitting element) 2 that emits blue light, a substrate 73 on which the chip 2 is mounted, and the chip 2. In this way, a sealing resin portion 74 made of a translucent resin molded on the substrate 73, a reflection sheet 75 (reflecting member) erected on opposite side surfaces of the sealing resin portion 74, and a sealing resin portion It is mainly comprised from the rod lens 5 which is provided so that one part may be buried in 74, and may become the output surface of the light emitted from the chip | tip 2. FIG.

As shown in FIGS. 10B and 10C, the substrate 73 has U-groove holding portions 79 formed at both ends in the X direction, and the rod lens 5 has a U-groove holding portion 79. The lower half in the diameter direction is buried in the sealing resin portion 74.
As shown in FIG. 10 (a), reflection sheets 75 are erected on both side surfaces extending in the X direction of the sealing resin portion 74, and the upper edge of the reflection sheet 75 and the top of the rod lens 5 have the same height. Is located.

The sealing resin portion 74 is molded in a state where the rod lens 5 is held by the holding portion 79.
That is, a mother substrate (not shown) in which a plurality of pairs of cathode electrodes 76a, anode electrodes 76b and a plurality of pairs of holding portions 79 corresponding to the plurality of light emitting devices 71 are formed is used. Each of the chips 2 is mounted, and a plurality of rod lenses 5 are positioned on the holding portion 79.
Thus, the mother substrate in which the plurality of chips 2 and the rod lens 5 are set is placed in a mold (not shown) surrounding the periphery, and the lower half in the diameter direction of the rod lens 5 is buried. A predetermined amount of translucent resin is poured, and after the translucent resin is cured, it is removed from the mold.
Thereafter, the mother substrate taken out from the mold is cut out for each light emitting device 71, and reflection sheets 75 are provided upright on both side surfaces extending in the X direction of the cut out sealing resin portion 74, respectively, as shown in FIGS. The light emitting device 71 in the state shown in each of the drawings is completed.

  The light emitting device 71 according to the seventh embodiment collects a large number of light emitting devices 71 by using a holding portion 79 corresponding to the plurality of light emitting devices 71 and a mother substrate on which the cathode electrode 76a and the anode electrode 76b are formed. Therefore, it is excellent in productivity and is advantageous from the viewpoint of manufacturing cost.

Of course, since the rod lens 5 is also used in the light emitting device 71 according to the seventh embodiment as in the first embodiment, the directivity characteristics excellent in the incident efficiency with respect to the light guide plate 100 (see FIG. 3) are obtained as in the first embodiment. It is done.
As a manufacturing method, a method for producing a plurality of light emitting devices 71 from a mother substrate at a time is described. However, the mother substrate is not necessarily used, and each light emitting device 71 is manufactured using a mold. It doesn't matter.
Further, when the light emitting device 71 according to the seventh embodiment is applied as a light source of a backlight device, one of the reflection sheets 75 is omitted and the light emitting device 71 is extended by extending the reflection sheet used in the backlight device. It may be configured to be used also as the reflective sheet.
In this case, the trouble of arranging the reflection sheet can be saved, and light leakage from the gap between the light emitting device and the light guide plate can be reliably eliminated.

Embodiment 8
A light-emitting device according to Embodiment 8 of the present invention will be described with reference to FIG. 11A and 11B are explanatory views showing the structure of the light emitting device according to the eighth embodiment. FIG. 11A is a cross section in the Y direction, FIG. 11B is a cross section in the X direction, and FIG. Each plane is shown. The same members as those used in the first embodiment will be described with the same reference numerals.

As shown in each drawing of FIG. 11, the light emitting device 81 according to the eighth embodiment is common to the light emitting device 71 according to the seventh embodiment in that the rod lens 5 is partially embedded in the sealing resin portion 84. However, the substrate 83 does not include the holding portion 79 (see FIG. 10) as in the seventh embodiment.
For this reason, the light emitting device 81 according to the eighth embodiment uses a mold capable of holding the rod lens 5 with a predetermined distance from the substrate 83, and a predetermined amount of translucent resin is used in the mold. It is made by pouring.
In the light emitting device 81 according to the eighth embodiment, since an ordinary plate-shaped substrate is used as the substrate 83, the cost associated with the substrate 83 is reduced as compared with the light emitting device 71 according to the seventh embodiment.
About another structure, it is the same as that of the light-emitting device 71 which concerns on the above-mentioned Embodiment 7. FIG.

Embodiment 9
A light emitting device according to Embodiment 9 of the present invention will be described with reference to FIG. 12A and 12B are explanatory views showing the structure of a light emitting device according to Embodiment 9 of the present invention. FIG. 12A is a cross section in the Y direction, FIG. 12B is a cross section in the X direction, and FIG. The planes viewed from the Z direction are shown. Note that the same members as those used in Embodiment 8 will be described with the same reference numerals.

As shown in each drawing of FIG. 12, the light emitting device 91 according to the ninth embodiment is formed by integrally molding the rod lens 5 and the sealing resin portion 84, which are separate members in the eighth embodiment, with a translucent resin. The sealing resin portion 94 is used. Of course, such a sealing resin portion 94 is formed by a mold.
In the light emitting device 91 according to the ninth embodiment, since the portion corresponding to the rod lens 5 (see FIG. 11) is integrally formed by the sealing resin portion 94, the rod lens 5 and the sealing resin as shown in FIG. There is no boundary with the portion 84, and Fresnel loss can be completely eliminated.
Other configurations are the same as those of the light-emitting device 81 according to Embodiment 8 described above.

  Here, the correlation between the diameter of the rod lens and the directivity will be described with reference to FIG. 13 is a graph showing the correlation between the diameter of the rod lens and the directivity, FIG. 13A is the directivity when the diameter of the rod lens is set to 0.2 mm, and FIG. 13B is the rod. Directivity characteristics when the lens diameter is set to 0.3 mm, and FIG. 13C shows directivity characteristics when the diameter of the rod lens is set to 0.4 mm.

In obtaining the correlation between the diameter of the rod lens and the directivity, in the light emitting device 1 according to Embodiment 1 described above, the width W1 of the opening 3b of the package member 3 is 0.42 mm and the length L2 is 2.0 mm. After setting the length L1 of the rod lens 5 to 1.6 mm, the diameter R1 of the rod lens 5 was changed to 0.2 mm, 0.3 mm, and 0.4 mm, and the directivity was measured. The refractive indexes of the rod lens 5 and the sealing resin part 4 were both set to 1.5.
In addition, in order to verify the influence of the rod lens 5 on the directivity, a light emitting device that differs only in that the rod lens 5 is not provided was manufactured as a comparative example, and the comparison with the directivity was also performed. The directivity characteristic of the light emitting device according to the comparative example is indicated by a broken line in each drawing of FIG.

As shown in FIG. 13 (c), when the diameter of the rod lens 5 is 0.4 mm, the light intensity is locally increased in a narrow range of −15 ° to 15 ° in the radiation direction in the Y direction. It can be seen that in the X direction, a natural light intensity having a radiation angle of approximately 0 ° in the range of −90 ° to 90 ° and a light intensity peak is obtained.
This is because the directivity angle is narrow with respect to the Y direction (thickness direction) of the end face of the light guide plate 100 (see FIG. 3) and the directivity angle is wide with respect to the X direction (width direction). It shows that ideal directivity characteristics are obtained to improve efficiency.

  Next, the correlation between the length of the rod lens and the directivity will be described with reference to FIG. FIG. 14 is a graph showing the correlation between the length of the rod lens and the directivity. FIG. 14A shows the directivity when the length of the rod lens is set to 1.6 mm, and FIG. Directivity when the length of the rod lens is set to 1.2 mm, FIG. 14C shows the directivity when the length of the rod lens is set to 0.8 mm, and FIG. 14D shows the length of the rod lens. The directivity characteristics when the height is set to 0.4 mm are shown.

In obtaining the correlation between the length of the rod lens and the directivity, in the light emitting device 1 according to Embodiment 1 described above, the width W1 of the opening 3b of the package member 3 is 0.42 mm, and the length L2 is 2.0 mm. After setting the diameter R1 of the rod lens 5 to 0.4 mm and changing the length L1 of the rod lens 5 to 1.6 mm, 1.2 mm, 0.8 mm, and 0.4 mm, the directivity characteristics are measured. did. The refractive indexes of the rod lens 5 and the sealing resin part 4 were both set to 1.5.
Moreover, the comparison with the light-emitting device which concerns on the comparative example which is not provided with a rod lens was also performed. The directivity characteristics of the light emitting device according to the comparative example are indicated by broken lines in each diagram of FIG.
As is apparent from each drawing of FIG. 14, it can be seen that even if the length L1 of the rod lens 5 is changed in the range of 1.6 to 0.4 mm, no significant change appears in the directivity.

  Finally, the correlation between the refractive index of the rod lens and the directivity will be described with reference to FIG. 15 is a graph showing the correlation between the refractive index of the rod lens and the directivity, and FIG. 15A shows the directivity when the refractive index of the rod lens is set to 1.4, and FIG. Indicates the directivity when the refractive index of the rod lens is set to 1.5, and FIG. 15C shows the directivity when the refractive index of the rod lens is set to 1.6.

In obtaining the correlation between the refractive index of the rod lens and the directivity, the width W1 of the opening 3b of the package member 3 of the light emitting device 1 according to the first embodiment is 0.42 mm, and the length L2 is 2.0 mm. The diameter R1 of the rod lens 5 is set to 0.4 mm, the length L1 is set to 1.6 mm, and the refractive index of the sealing resin portion 4 is set to 1.5. The directivity was measured while changing the values to 1.4, 1.5, and 1.6.
Moreover, the comparison with the light-emitting device which concerns on the comparative example which is not provided with a rod lens was also performed. The directivity of the light emitting device according to the comparative example is indicated by a broken line in each drawing of FIG.

As is apparent from each drawing of FIG. 15, even if the refractive index of the rod lens 5 is changed in the range of 1.6 to 1.4, the directivity characteristics do not particularly change, but FIG. As shown in the figure, when the refractive index of the rod lens 5 is 1.5, the light intensity is locally increased when the radiation angle in the Y direction is in the range of -15 ° to 15 °, and the Y direction and the X direction. In these directions, a favorable directivity characteristic with little local light intensity drop is obtained.
This indicates that when the refractive index of the rod lens 5 and the refractive index of the sealing resin portion 4 are equal, the Fresnel loss is suppressed, and the emission efficiency of the light emitted from the chip 2 becomes excellent.

In each of the light emitting devices according to the first to ninth embodiments described above, the phosphor is dispersed and mixed in the sealing resin portion, but of course, the phosphor may be layered on the surface of the chip. Good.
According to such a configuration, since the phosphor emits fluorescence on the surface of the chip, the scattered light component that is difficult to control the directivity is reduced, and the directivity of the rod lens is further controlled. It becomes easy.
In addition to the sixth embodiment, a normal chip having a cathode and an anode on the surface side is used. Of course, as in the sixth embodiment, the flip-chip type chip may be used to reduce the thickness of the light emitting device.

Also, the configuration for emitting white light from the light emitting device has been described as a configuration in which blue light emitted from the LED chip and yellow light emitted from the phosphor excited by the blue light are mixed, but red light is emitted by the blue light. It is also possible to use a phosphor that excites green and a phosphor that excites green light. Furthermore, it is good also as a structure which uses three types of fluorescent substance which emits ultraviolet light from a LED chip and excites red light, green light, and blue light, respectively.
Further, although only one LED chip is mounted in the above embodiment, a plurality of LED chips may be mounted in parallel or in series.

It is a perspective view of the light-emitting device concerning Embodiment 1 of this invention. It is explanatory drawing which shows the structure of the light-emitting device shown by FIG. It is explanatory drawing which shows a mode that the light radiate | emitted from the light-emitting device which concerns on Embodiment 1 injects into a light-guide plate. It is explanatory drawing which shows the structure of the light-emitting device which concerns on Embodiment 2 of this invention. It is explanatory drawing which shows the structure of the light-emitting device which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows the structure of the light-emitting device which concerns on Embodiment 4 of this invention. It is explanatory drawing which shows the structure of the light-emitting device which concerns on Embodiment 5 of this invention. It is explanatory drawing which shows the structure of the light-emitting device concerning Embodiment 6 of this invention. It is a perspective view of the light-emitting device concerning Embodiment 7 of this invention. It is explanatory drawing which shows the structure of the light-emitting device shown by FIG. It is explanatory drawing which shows the structure of the light-emitting device which concerns on Embodiment 8 of this invention. It is explanatory drawing which shows the structure of the light-emitting device based on Embodiment 9 of this invention. It is a graph which shows the correlation of the diameter of a rod lens, and directivity. It is a graph which shows the correlation of the length of a rod lens, and directivity. It is a graph which shows the correlation with the refractive index of a rod lens, and directivity. It is explanatory drawing which shows the structure of the light-emitting device which concerns on a 1st prior art example. It is explanatory drawing which shows a mode that the light emitted from the light-emitting device which concerns on a 1st prior art example injects into a light-guide plate. It is explanatory drawing which shows the structure of the light-emitting device which concerns on a 2nd prior art example. It is explanatory drawing which shows a mode that the light emitted from the light-emitting device which concerns on a 2nd prior art example injects into a light-guide plate.

Explanation of symbols

1, 21, 31, 41, 51, 61, 71, 81, 91 ... Light emitting device 2, 62 ... LED chip 3, 23, 33 ... Package member 3a, 23a ... Recess 3b, 23b, 33b ... opening 3c, ... bottom 3d, 23d, 33d, 43d, 53d ... side walls 4, 74, 84, 94 ... sealing resin part 5 ... rod lenses 6a, 66a 76a ... Electrode for cathode 6b, 66b, 76b ... Electrode for anode 7a, 7b ... Wire 8 ... Phosphor 29, 39, 49, 59, 79 ... Holding part 73, 83 .. substrate 75 .. reflective sheet 100 .. light guide plate L1 .. length of rod lens R1 .. diameter of rod lens W1 .. width of opening L2 .. length of opening

Claims (13)

  A light emitting element that emits light, a package member that has a recess defined by an opening and a bottom surface, and on which the light emitting element is mounted, and a translucent resin that fills the recess so as to cover the light emitting element And a lens member that is provided so as to be partially embedded in the sealing resin portion and serves as an emission surface of light emitted from the light emitting element.   The light emitting device according to claim 1, wherein the lens member is disposed so as not to protrude from the opening of the recess.   The light emitting device according to claim 1 or 2, wherein a holding portion for positioning and holding the lens member is formed in a part of the hollow portion.   A light emitting element that emits light, a substrate on which the light emitting element is mounted, a sealing resin portion made of a light-transmitting resin molded on the substrate so as to cover the light emitting element, and at least a part of the periphery of the sealing resin portion A light emitting device comprising: a reflective member standing on the surface; and a lens member that is provided so as to be partially embedded in the sealing resin portion and serves as an emission surface of light emitted from the light emitting element.   The light emitting device according to claim 4, wherein the lens member is disposed so as not to protrude from the upper edge of the reflecting member.   The light emitting device according to claim 4, wherein the sealing resin portion and the lens member are integrally formed of a translucent resin.   The light emitting device according to claim 1, wherein the sealing resin portion contains a phosphor.   The light emitting device according to claim 7, wherein the phosphor is layered on the surface of the light emitting element.   The light emitting device according to claim 1, wherein the sealing resin portion and the lens member have substantially the same refractive index.   The light-emitting device according to claim 1, wherein the lens member is a cylindrical rod lens.   The light-emitting device according to claim 10, wherein the rod lens is disposed so as to lie on the surface of the sealing resin portion, and has a diameter such that substantially the entire area of the surface of the sealing resin portion is occupied by the rod lens.   The light emitting device according to claim 1, wherein the light emitting element is a flip chip type light emitting element.   The backlight apparatus provided with the light-emitting device as a light source, Comprising: A light-emitting device consists of the light-emitting device as described in any one of Claims 1-12.

Images