JP2001284658A - Light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device which can highly efficiently make external radiation and can effectively prevent the occurrence of dark noise and, at the time of turning on and turning off a light source, the decline of contrast. SOLUTION: This light source device is constituted by mounting an LED which emits the light from a light emitting element by reflecting the light on its reflecting surface on a substrate and setting up a light shielding member on the substrate at a position facing the mounted side of the LED. The light shielding member has a through port and the light emitted from the light emitting element is reflected on the reflecting surface, converged into a focus at the through port, and radiated outward from the through port.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device. Further, the present invention relates to a light emitting device such as a display using the light source device.

[0002]

2. Description of the Related Art A display using an LED as a light source is conventionally known. LED, compared to incandescent bulb,
There are advantages such as small size and power saving, and high directivity light can be obtained. Examples of the type of LED used include a lens-type LED. Lens type L
In the ED, a lens effect is given to a transparent resin as a sealing member, and the directivity of light is enhanced by the lens effect. Further, a reflection type L different from the lens type LED is used.
ED is generally known. The reflection type LED is an LED having high external radiation efficiency because even light emitted in the lateral direction from the light emitting element can be used as external emission light by being reflected on the reflection surface. In the lens type LED,
The external radiation efficiency is greatly reduced as the light distribution characteristic with high directivity is increased. However, in the reflection type LED, the external radiation efficiency does not depend on the light distribution characteristic. As described above, the reflective LED has a characteristic that it can emit light with high luminance and a wide light distribution angle. From such characteristics, it is considered that the reflective LED is suitably used for a display or the like that is installed outdoors or the like and requires high visibility. 10 and 11 show a light source device 200 using a conventional reflective LED. FIG. 11 is a plan view of the light source device 200 as viewed from the external radiation side of light (from above in FIG. 10). In the light source device 200, the light from the light emitting element 110 is once reflected by the reflecting mirror 120 and then emitted from the radiation surface 140 to the outside. In the drawing, reference numeral 130 denotes a sealing member, reference numerals 400 and 410 denote leads, and reference numeral 210 denotes an LED.

[0003]

In a display installed outdoors or the like, when external light is taken in and reflected by the LED, even when the LED is turned off, apparently light (e.g., light emitted from the LED side) is emitted. (Dark noise) is observed, and as a result, there arises a problem that the contrast between when the LED is turned on and when the LED is turned off is reduced. Therefore, in order to suppress such dark noise and reduce the decrease in contrast,
A portion other than the light emitting surface of the LED is covered with a member such as black,
The capture of external light to the ED side is suppressed as much as possible. In the case of the light source device 200 described above, the light-shielding plate 300 prevents external light from being captured from a portion other than the light emitting surface 140. However, as shown in FIGS. 10 and 11, the emission surface 140 of the LED 210 is exposed to a large area with respect to external light, so that the dark noise still causes a significant decrease in the contrast between when the LED is turned on and when the LED is turned off. It remains as a problem. Such a problem occurs not only when a reflective LED is used but also when a lens LED is used.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a high external radiation efficiency, a small amount of dark noise, and an effective reduction in contrast between when the light source is turned on and when the light source is turned off. It is an object of the present invention to provide a light source device which can be prevented from occurring. The configuration is as follows. An LED that reflects and emits light from a light emitting element by a reflection surface, and a light blocking member that is installed in a light emission direction of the LED,
A light-shielding member having an optical opening having an opening area smaller than the area of the reflection surface as viewed in plan from the light emission direction, wherein the light emitted from the LED is collected, The light source device is externally radiated from the optical opening.

[0005] According to this configuration, the light-blocking member allows the LE.
Although external light is prevented from being taken into the D side, since the opening area of the optical opening provided in the light shielding member is small, external light taken into the LED side through the optical opening is reduced. it can. That is, external light can be effectively prevented from being taken into the LED side, and the light shielding effect is high. Further, since the light from the LED is condensed and then externally radiated from the optical opening of the light shielding member, the provision of the light shielding member does not lower the external radiation efficiency. That is, the light from the LED can be efficiently radiated to the outside while effectively preventing external light from being taken in. Therefore, it is possible to provide a light source device that emits light of high luminance and effectively prevents a decrease in contrast between when the LED is turned on and when the LED is turned off due to dark noise.

BEST MODE FOR CARRYING OUT THE INVENTION

[0006] The LED is provided with a light emitting element and a reflecting surface, and at least a part of the light from the light emitting element is emitted after being reflected by the reflecting surface once. The element structure of the light emitting element is not limited, and a known element can be arbitrarily selected and used. Further, the emission color of the light emitting element is appropriately selected according to the purpose. For example, the color is selected according to a desired emission color such as blue, red, and green. Further, a plurality of light emitting elements can be used. In that case, the same kind of light emitting elements may be combined, or a plurality of different kinds of light emitting elements may be combined. For example, red, the three primary colors of light,
Light emitting elements having green and blue light emission colors are combined. According to such a configuration, an LED capable of emitting an arbitrary color can be obtained. As the blue light emitting element, for example, an element made of a group III nitride compound semiconductor can be employed.

[0007] A light blocking member is provided in the light emission direction of the LED. The light-shielding member may be, for example, a plate-like member having a substantially circular shape, a substantially elliptical shape, a substantially rectangular shape in a plan view, and a shape obtained by arbitrarily combining these. The material of the light shielding member is not particularly limited as long as it is suitable for light shielding,
For example, a black colored resin or the like having a high light-shielding effect can be used. Further, it is not necessary that the entire light-shielding member is formed of a light-shielding material. For example, a black paint may be applied only to the outer surface (the side to which external light is irradiated) to have light-shielding properties. .

[0008] The light shielding member is provided with an optical opening.
The optical opening refers to a portion of the light shielding member that can transmit light, and is formed by, for example, providing a through hole in a part of the light shielding member. In this case, the through-hole can be filled with a transparent resin or the like. According to this configuration, it is possible to prevent dust, dust, water, and the like from entering the inside of the light source device through the through hole from outside. In the case where a black paint is applied to provide a light-shielding property as described above, an unpainted portion may be provided in a part, and this may be used as an optical opening. The optical opening has an opening area smaller than the area when the reflecting surface is viewed in a plan view from the light emission direction. That is, the optical aperture is smaller than the reflection surface. By making the optical aperture small,
The external light is effectively prevented from being taken into the LED. Further, the opening area of the optical opening can be substantially the same as the light collecting area of the light from the LED in the optical opening. According to this configuration, almost the entire amount of light can be emitted to the outside, and the light shielding effect of the shielding member can be maximized. The number of optical apertures is determined corresponding to the number of LEDs described above,
Preferably, as many optical apertures as LEDs are provided.
When a plurality of LEDs and a plurality of optical openings are provided, light from each LED is radiated to the outside through the corresponding optical opening. A plurality of optical openings may be provided for one LED, and light from one LED may be externally radiated through the plurality of optical openings. Various shapes can be adopted as the shape of the optical opening. For example, the shape is a circle, an ellipse, a rectangle, or the like in plan view.

The reflecting surface is disposed at a position where light from the light emitting element is reflected. For example, the light emitting element is arranged such that the light blocking member side is the back side, and the reflection surface is arranged on the light emitting surface side of the light emitting element. Further, the light-emitting element is arranged such that the light-shielding member side is the light-emitting surface side, and the reflection surface is arranged in the side direction of the light-emitting surface of the light-emitting element. In this case, it is assumed that the opening of the reflection surface is on the light shielding member side. It is assumed that the shape of the reflecting surface can be collected by, for example, reflecting light from the light emitting element. Further, when the light emitting element is sealed with a sealing member made of a light transmitting material such as epoxy resin or glass, and
The light from the light-emitting element travels through the sealing member after being reflected by the reflection surface, and is emitted after being refracted on the surface (light emission surface). A reflective surface is used in which the light emitted from the surface) is focused on one point with a focal point. In this case, the light emission surface of the sealing member can be made flat. In addition, a reflection surface having a shape such that light reflected by the reflection surface becomes parallel light can be employed. For example, a reflection surface having a substantially paraboloid of revolution with a light emitting element as a focal point is used. In this case, the light emitting surface of the sealing member has a telecentric shape. As a result, the LED has a telecentric optical system, and the parallel light emitted from the light emitting element and reflected by the reflection surface is focused to one point by the light emission surface of the sealing member.

The reflecting surface can be formed by molding a resin into a desired shape, or by pressing a metal plate. When a resin molded product is used, the surface is made light-reflective by performing metal deposition, plating, or the like on the surface, or by applying a metal or the like to the surface. In addition, it is preferable to use a metal plate made of a material having a high light reflectance, but it is also possible to perform a process for increasing the light reflection efficiency of the surface after press working.

As described above, the light emitted from the LED is collected by the reflecting surface or the reflecting surface and the light emitting surface of the sealing member. The collected light is collected at one point. In this case, it is preferable that there is an optical opening of the light shielding member at the light condensing position. According to such a configuration, the light from the LED can be concentrated in a narrow area of the optical opening, and can be externally radiated with a smaller optical opening. Further, since the optical opening can be formed smaller, external light taken into the LED side via the optical opening can be reduced. Further, the light emitted from the LED preferably has a focal point at the optical opening of the light blocking member. According to such a configuration,
This is because the light emitted from the LED can be externally radiated with a smaller optical opening, so that the generation of dark noise and a decrease in contrast due to the capture of external light can be more effectively prevented. Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings.

[0012]

FIG. 1A shows the configuration of a light source device 1 according to one embodiment of the present invention. FIG. 1B shows a light source device 1.
FIG. The light source device 1 includes an LED 10 and a mounting substrate 2
0, and a light-shielding plate 30, and a display,
It can be used as a light source such as a signal light. FIG. 3 shows the light source device 1 from the external radiation side of light (FIG. 1).
FIG. 4 is a plan view as viewed from above (in (a)). Hereinafter, the configuration of the light source device 1 will be described with reference to the drawings.
The LED 10 is a reflective LED, and includes a light emitting element 11,
It comprises a lead 41 on which the light emitting element 11 is mounted, a lead 40 electrically connected to the light emitting element 11 by a wire, a reflecting mirror 12, and a sealing member 13 made of a transparent resin. In this embodiment, a light emitting device made of a group III nitride-based compound semiconductor was used as the light emitting element 11 to provide a light source device for emitting blue light. Of course, a light-emitting element of an arbitrary color can be used, and a light source device of a desired color can be obtained. Furthermore, a light source device capable of emitting light of any color can be obtained by using RGB type LEDs in which light emitting elements of red, green, and blue light emitting colors are combined.

The reflecting mirror 12 is formed by pressing a metal plate into a desired shape. The shape of the reflecting mirror is
Is reflected by the reflecting mirror 12, refracted by the light emitting surface 14, and then condensed at one point (f1) (FIG. 1).
(B)). In addition, Ag or the like was deposited on the surface of the reflecting mirror in order to increase the reflectance.

The light shielding plate 30 is a black, plate-shaped member and has a light shielding function. Further, a through hole 31 for externally radiating light from the LED 10 is provided in a central portion of the light shielding plate 30.

The LED 10 is mounted on a general-purpose board. Further, the light shielding plate 30 is arranged so that the focal point f1 of the light emitted from the LED 10 is located at the position of the through-hole 31 (see FIG. 21B). The through-hole 31 has a minimum size under the condition that a margin is provided for the condensing diameter at the focal point f1 in consideration of mounting accuracy. In the case where dark noise reduction is prioritized over external radiation efficiency, the light shielding plate 30
Can be made smaller.

Next, with reference to FIG. 1B, the light emission mode in the light source device 1 will be described. In the light source device 1 of the present embodiment configured as described above, substantially the total amount of light emitted from the light emitting element 11 is reflected by the reflecting mirror 12 and reaches the light emitting surface 14 of the sealing resin 13, and the light emitting After being refracted by the surface 14, the light is condensed with the through hole 31 of the light shielding plate 30 as a focal point,
The light is externally radiated from the through-hole 31 in the same angle range α1 as the converging angle without being blocked by the light shielding plate 30. On the other hand, the outside light reaches the light shielding plate 30 provided with the through-hole 31,
Most of the light is absorbed by the portion other than the through-hole 31 occupying most of the area of the light shielding plate 30. On the other hand, a very small part of the external light enters the LED 10 through the through hole 31.
The amount of external light that enters the LED 10 through the through hole 31 is proportional to the area of the incident surface (that is, the area of the through hole 31). Since a very small through hole 31 is formed as compared with (see FIGS. 10 and 11), the amount of external light entering through this through hole 31 can be reduced. That is, the amount of external light incident on the LED side can be extremely small as compared with the conventional example. Most of the external light that has entered the LED 10 side through the through-hole 31 is absorbed by the surface of the light-shielding plate 30 on the LED 10 side or the like. Therefore, the reflectance of external light incident on the light source device 1 is extremely low. As described above, in the light source device 1, the light emitted from the light emitting element 11 is reflected by the reflecting mirror 12, is radiated with high efficiency, is condensed, and is radiated outside without being blocked by the light shielding plate 30. , A light source device with high external radiation efficiency and high brightness. Furthermore, a high light-shielding effect against external light can be obtained without impairing the high external radiation efficiency and high luminance characteristics. As a result, a light source device with high visibility at the time of lighting and extremely high darkness due to extremely low dark noise has a high contrast between when the LED is turned on and when the LED is turned off.

In the above description, the structure of the light shielding plate 30 is not limited to the above, and for example, the structure shown in FIG. 3 or FIG. 4 can be adopted. In the light-shielding plate 30a of FIG. 3, a light-shielding part 32 made of a black resin and a light-transmitting part 33 made of a light-transmitting resin are formed. Shield plate 30a
Can be formed by integrally molding a black resin and a light-transmitting resin. According to this configuration, LE
The light from D10 is radiated from the light transmitting part 33 to the outside. Further, in the light-shielding plate 30b of FIG. 4, black printing is performed except for a part of the surface of the plate-shaped glass 34, so that the light-transmitting portion 36 (non-printing portion) and the light-shielding portion (printing portion) 3
5 was formed. In such a configuration, light from the LED 10 is externally radiated from the light transmitting section 36. It is also possible to use a light-transmitting resin other than glass. According to the configuration shown in FIGS. 3 and 4, it is possible to prevent the entry of dust and dirt from the outside, and to obtain a waterproof effect.

In the light source device 1 described above, an outer lens may be provided on the external radiation side. The outer lens is provided to control light emitted from the light source device 1 and to have a desired directivity. For example, a lens made of a light-transmitting resin is attached to the external radiation side of the through hole 31 of the light shielding plate 30. Thereby, light emitted from the through-hole 31 to the outside can have desired directivity. Of course,
The outer lens does not need to be directly attached to the light-shielding plate 30, and may be installed at regular intervals.

By changing the shape of the reflecting mirror 12 and shortening the focal length, as shown in FIGS. 5A and 5B, the light distribution angle indicated by the angle α2 (see FIG. 5B) is obtained. The light source device can be wide. In this case, the distance between the LED 10 and the light shielding plate 30 becomes short. Conversely, if the focal length is made longer than in the case of FIG. 1, a light source device with a narrow light distribution angle can be obtained. In this case, the distance between the LED 10 and the light shielding plate 30 becomes longer. However, the condensing diameter at the focal position becomes larger as the focal length becomes longer.
Is desirably formed in a necessary and sufficient size according to the condensing diameter.

Next, the light source device 3 shown in FIG. 46 will be described. The same members as those of the light source device 1 are denoted by the same reference numerals, and description thereof will be omitted. LE of the light source device 3
In D60, a sealing member 63 having a light emitting surface 64 having a telecentric lens surface shape is used. Further, the reflecting mirror 62 has a paraboloid of revolution having the light emitting element 11 as a focal point. In the light source device 3 having such a configuration, the light from the light emitting element 11 is first reflected by the reflecting mirror 62 to become parallel light,
The light is directed toward the light emitting surface 64 of the sealing member 63 (see FIG. 6B). The light that has reached the light emitting surface 64 is condensed by the telecentric lens surface with the through-hole 31 of the light shielding plate 30 as the focal point and is emitted outside. As described above, in the light source device 3, the light emitted from the light emitting element 11 once travels in the sealing member 63 as parallel light, and is then collected by being emitted from the sealing member 63. Here, when traveling through the sealing member 63, the light emitting element 11 is
Although a part of the light from the light source is lost, in the configuration of this embodiment,
The optical path diameter at the lead height is substantially the diameter of the reflecting surface of the reflecting surface as viewed in plan from the light emitting side, and is the light source device 1 of the above embodiment.
As described above, the area of the leads 40 and 41 with respect to the area of the light passing through the plane at the height of the leads can be reduced, and the light loss due to the leads 40 and 41 can be reduced. be able to. Such a configuration of the present embodiment is particularly effective when the external radiation angle range β (see FIG. 4B) is designed to be large. . This is because the external radiation angle range β can be increased without changing the area ratio of the light passing through the plane at the lead height to the area of the lead. In the LED 60, a lens may be provided instead of the sealing member 63, and the light reflected by the reflecting mirror 62 may be condensed by the lens to form a telecentric optical system. At this time, the light emitting element 11 of the LED 60 may be sealed by the sealing member 63, or may not be sealed by the sealing member.

The light source device according to the present invention is not limited to the above-described embodiment, and may have a configuration shown in FIG. 7, for example. In the light source device 4 of FIG. 7, the light emitting element 71 is directly mounted on the substrate 20, and the reflecting members 72 and 73 having a reflecting surface are arranged around the light emitting element 71. The light source device 4 having such a configuration is inferior in external radiation efficiency as compared with the light-emitting devices 1 to 3 of the above embodiment, but can expect about 50% of the external radiation efficiency without depending on the directivity. It has the advantage of being easy. In the lens type LED, when the directivity is increased, the external radiation efficiency is reduced, and when the parallel light is derived, the external radiation efficiency is about 30%. If the light collection degree is further increased and applied to the present invention, , The external radiation efficiency is inferior. For this reason, if the light source device of the present invention is configured using a lens-type LED, even if dark noise can be reduced, the amount of external radiation and the brightness will be significantly reduced, so that the contrast between when lit and when turned off will be improved. I can't hope. Thus, the optimal LED structure for the present invention is of the reflective type.

In each of the above light source devices, the light source device is configured using one light shielding plate, one LED, and one substrate, but the light source device may be configured using a plurality of LEDs for one light shielding plate. it can. FIG. 8 shows an example of the light source device 5 using 16 RGB type LEDs (not shown) for one light shielding plate. FIG. 9 is a plan view of the light source device 5 observed from the external radiation side. In the light source device 5, the same number of through-holes 35 as the LEDs are provided, and light from each LED is condensed and then emitted from the corresponding through-hole 35 to the outside. When a plurality of LEDs are used, it is preferable to mount the plurality of LEDs on one board, but it is also possible to use a plurality of boards.

Using a plurality of the above light source devices 1 to 5,
A light-emitting device such as a display or a signal light can be formed. Of course, depending on the purpose of use, the light emitting device can be configured using one light source device. Light source device 5 in housing 1
FIG. 7 shows a full-color display 100 arranged and arranged in a matrix in FIG. As described above, in the light source device of the present invention, high brightness and external light are effectively prevented from being taken in, so that the display 100 having high brightness and high contrast can be obtained. When any one of the light source devices 1 to 3 of the above embodiments is used as the light source device, a display with particularly high luminance and high contrast can be configured. Such a display is suitable as a display that can be viewed over a long distance outdoors or the like. Further, since the light source device 4 of the above embodiment is easy to manufacture,
This is particularly effective for a display or the like using a large number of light source devices, and has an advantage that a dot pitch can be reduced when a display is configured.

In the light source device of the above embodiment, a part of the light from the light emitting element is excited by the light of the emission wavelength to irradiate a fluorescent material which emits fluorescence to convert the wavelength, and this light and the fluorescent material are irradiated. It can be mixed with emitted light without being emitted. For example, by coating or sealing the light-emitting element with a light-transmitting resin containing a phosphor, the phosphor can be arranged at a position where light from the light-emitting element is irradiated. In this case, for example,
A light emitting element having a light emission wavelength in the range of 380 nm to 500 nm is employed. Preferably, the emission wavelength is 4
A light-emitting element with a wavelength of 20 nm to 490 nm is used. More preferably, a light-emitting element having a light emission wavelength of 450 nm to 475 nm is used. As a device satisfying such a condition, a light emitting device including the above-described group III nitride-based compound semiconductor can be given. As the phosphor, the following can be suitably used. That is, ZnS: Cu, Au, A
1, ZnS: Cu, Al, ZnS: Cu, ZnS: M
_{n, ZnS: Eu, YVO 4} : Eu, YVO 4: Ce,
One or more phosphors selected from Y ₂ O ₂ S: Eu and Y ₂ O ₂ S: Ce are used. Where Zn
S: Cu, Au, Al refers to Zn,
It is a ZnS-based photoluminescent phosphor activated with Au and Al. ZnS: Cu, Al, ZnS: Cu,
ZnS: Mn and ZnS: Eu are photoluminescent phosphors similarly activated by Cu and Al, Cu, Mn, and Eu, respectively, using ZnS as a host. Similarly, Y
VO ₄ : Eu and YVO ₄ : Ce are phosphors activated by Eu and Ce, respectively, using YVO ₄ as a matrix, and Y ₂
O ₂ S: Eu and Y ₂ O ₂ S: Ce are phosphors activated by Eu and Ce, respectively, using Y ₂ O ₂ as a host. These phosphors have an absorption spectrum for blue to green light, emit light having a wavelength longer than the excitation wavelength, and are used in combination with a light emitting element in the above wavelength range to produce a white light. Light emission is obtained.

Among the above phosphors, ZnS: Eu, YV
O ₄ : Ce and Y ₂ O ₂ S: Ce have longer emission wavelengths for blue to green excitation light than other phosphors, that is, the emission colors from these phosphors are more reddish. Therefore, as a result, the light obtained by mixing the light emitted from these phosphors and the light from the light emitting element has a color closer to white. As described above, in order to obtain a light emission color closer to white, ZnS: Eu, YVO ₄ : Ce and Y ₂
It is preferable to select one or two or more selected from O ₂ S: Ce as the phosphor.

The present invention is not at all limited to the description of the above-described embodiments and examples. Various modifications are included in the present invention without departing from the scope of the claims and within the scope of those skilled in the art.

[Brief description of the drawings]

FIG. 1A is a diagram showing a light source device 1 according to one embodiment of the present invention. FIG. 1B is an optical path diagram of the light source device 1.

FIG. 2 is a view of the light source device 1 as viewed from an external radiation side.

FIG. 3 is a diagram showing a configuration in the case of using a light shielding plate 30a having a different configuration.

FIG. 4 is a diagram showing a configuration in the case of using a light shielding plate 30b having a different configuration.

FIG. 5A is a diagram illustrating a light source device 2 including a reflecting mirror 22 having a different configuration. FIG. 5 (b)
FIG. 3 is an optical path diagram of the light source device 2.

FIG. 6A is a diagram showing a light source device 3 according to another embodiment of the present invention. FIG. 6B is an optical path diagram of the light source device 3.

FIG. 7 is a light source device 4 according to another embodiment of the present invention.
FIG.

FIG. 8 is a diagram illustrating a light source device 5 configured to use a plurality of LEDs for one light shielding plate 33.

FIG. 9 is a partially enlarged view of a full-color display 100 configured by arranging the light source devices 5 in a matrix.

FIG. 10 is a diagram showing a light source device 200 using a conventional reflective LED 210.

FIG. 11 is a view of the light source device 200 as viewed from an external radiation side.

[Explanation of symbols]

 1 2 3 4 5 Light source device 10 LED 11 Light emitting element 12 22 62 Reflecting mirror 13 63 Sealing member 14 64 Light emitting surface 20 Substrate 30 30a 30b 33 Light shield plate 31 35 Through hole 33 36 Light transmitting portion 40 41 Lead 100 Display device α1 α2 β External radiation angle

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takemasa Yasukawa No. 1, Nagahata Ochiai, Kasuga-cho, Nishikasugai-gun, Aichi F-term (reference) 5F041 AA04 AA06 AA14 CB36 DA43 DA55 DA57 DB08 EE23 EE24 FF06 FF11

Claims (12)

[Claims] 1. An LED that reflects light emitted from a light emitting element by a reflection surface and emits the light, and a light-blocking member provided in a light emission direction of the LED, wherein the light-shielding member is provided in a plan view from the light emission direction. A light-shielding member having an optical opening having an opening area smaller than the area, and the light emitted from the LED is condensed and then externally radiated from the optical opening of the light-shielding member. A light source device characterized by the above-mentioned. 2. The light source device according to claim 1, wherein the light emitted from the LED is condensed at one point, and the optical opening of the light shielding member is located at the condensing position. 3. The opening area of the optical opening is:
The light source device according to claim 1, wherein the light emission area of the light emitted from the LED is substantially the same as the light collection area in the optical opening. 4. The LED according to claim 1, wherein the light-emitting element is provided with the light-shielding member side as a back side and the light-emitting element is provided with the reflection surface arranged to face a light-emitting surface side of the light-emitting element. The light source device according to claim 1. 5. The reflection surface of the LED, wherein the light-emitting element is disposed such that the light-shielding member side is a light-emitting surface side, and the light-emitting element has an opening on the light-shielding member side in a lateral direction of the light-emitting surface of the light-emitting element. The light source device according to any one of claims 1 to 3, further comprising: 6. The light source device according to claim 1, wherein the light emitted from the LED has a focal point at the optical opening of the light blocking member. 7. The LED further includes a sealing member for sealing the light emitting element, and a light emitting surface emitted from the light emitting element and reflected by the reflecting surface is emitted from the sealing member. Has a flat shape, and the reflection surface reflects light from the light emitting element to the reflection surface and is refracted by the light emission surface of the sealing member.
The light source device according to claim 6, wherein the light source device has a shape having a focal point for condensing light at one point. 8. The LED according to claim 1, wherein the reflecting surface has a substantially paraboloid of revolution with the light-emitting element as a focal point, and a light-emitting element which collects light emitted from the light-emitting element and reflected by the reflecting surface. The light source device according to claim 6, further comprising an optical system. 9. A plurality of said LEDs are provided, and said light shielding member is provided with a plurality of optical openings respectively corresponding to said plurality of LEDs, and light from each of said plurality of LEDs is The light source device according to any one of claims 1 to 8, wherein light is externally radiated from the optical openings corresponding to the respective LEDs. 10. A light-emitting device using one or more light source devices according to claim 1. 11. A light-emitting device comprising a plurality of light source devices according to claim 1 arranged in a matrix. 12. The light emitting device according to claim 10, wherein the light emitting device is a signal light or a display.