JP2006190723A - Optical source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical source device where a degree of freedom on condensing and diffusion by reducing loss of outgoing light from a light emitting element. <P>SOLUTION: The optical source device is provided with a circuit board 1 having an electrode wiring pattern 2 and an outer connection electrode terminal 3 connected to the electrode wiring pattern 2 on a surface, a plurality of blue light emitting diodes 4b which are electrically connected and mounted onto the electrode wiring pattern 2 of the circuit board 1, a YAG phosphor film 5 formed on the blue light emitting diodes 4b, and a lens 6 which is installed on the YAG phosphor film 5 through an air layer 8 and has an inner lens face 6i and an outer lens face 6o which are bonded onto the circuit board 1. Thus, a white color can be obtained by maximum lens effect with two-face property of the lens caused by refractive power of the air layer 8 and the lens 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a light source device, and more particularly to a light source device suitable for application to illumination means for projecting light emitted from an organic light emitting element onto a subject, and particularly suitable as a flash light source for a camera mounted on a mobile phone or the like. The present invention relates to a light source device.

  In recent years, in this type of light source device, for example, a light emitting element is mounted on a circuit board as means for converting an electrical signal into an optical signal, and a hemispherical lens unit is provided so as to cover the entire surface of the light emitting element on the circuit board. There has been proposed an optical element module structure configured by sealing with a light-transmitting sealing resin.

In addition, regarding this type of prior art, for example, the following Patent Document 1 can be cited.
JP 2004-186514 A

  However, in the light source device configured as described above, since the lens is formed of the sealing resin on the light emitting element, there is no air layer between the light emitting element and the lens, and therefore the lens having only the outer lens. Only an effect can be obtained. That is, since only the effect of the lens 1 surface can be obtained, the emitted light reaching the illumination surface cannot be sufficiently controlled, and the light emitted from the light emitting element is lost. In other words, the illuminance on the illumination surface decreases. Moreover, the subject that the illumination intensity dispersion | variation in each point in an illumination surface generate | occur | produced occurred. Furthermore, there has been a problem that the degree of freedom of light diffusibility and light condensing with respect to the light emitting surface is reduced.

  In the light source device configured as described above, since the lens is mounted from above after the light emitting element is packaged on the circuit board, the number of parts and the number of assembly steps are improved, and the production cost is increased. There was a problem.

  Accordingly, the present invention has been made to solve the above-described conventional problems, and its purpose is to improve the degree of freedom of light collection and diffusion by reducing the loss of light emitted from the light emitting element. It is in providing the light source device which can be performed.

  Another object of the present invention is to provide a light source device capable of improving lens performance and reducing assembly man-hours by improving the lens effect.

  In order to achieve such an object, a light source device according to the present invention comprises an insulating substrate having an electrode wiring pattern and an external connection electrode terminal connected to the electrode wiring pattern on the surface, and an electrode wiring pattern of the insulating substrate. Multi-color organic light-emitting elements that are electrically connected and mounted thereon, and an inner lens surface and an outer surface that are installed through an air layer for these organic light-emitting elements and bonded onto an insulating substrate By constituting from a lens having a lens surface, the maximum lens effect due to the dihedrality of the lens resulting from the refractive index of the air layer and the lens can be obtained, so that the problems of the background art can be solved.

  In addition, another light source device according to the present invention includes an insulating substrate having an electrode wiring pattern and an external connection electrode terminal connected to the electrode wiring pattern on the surface, and an electrode on the electrode wiring pattern of the insulating substrate. A plurality of organic light emitting elements that are connected and mounted, and at least one lens having an inner lens surface and an outer lens surface that are installed on the insulating substrate via an air layer with respect to the organic light emitting element; By constructing this lens from a lens support that supports and fixes the insulating substrate on the insulating substrate, the maximum lens effect due to the lens dihedrality caused by the refractive index of the air layer and the lens can be obtained. The problem can be solved.

  In addition, another light source device according to the present invention is electrically connected to an insulating substrate having an electrode wiring pattern and an electrode terminal for external connection connected to the electrode wiring pattern on the surface, and the electrode wiring pattern of the insulating substrate. At least one blue light emitting element mounted in this manner, a phosphor coated on the outer peripheral surface of the blue light emitting element, and installed on the blue light emitting element through an air layer and bonded onto an insulating substrate By comprising the lens having the inner lens surface and the outer lens surface, the emitted light emitted from the blue light-emitting element can be fully utilized, so the degree of freedom of light condensing and diffusing can be greatly improved. The problem of the background art can be solved.

  In addition, another light source device according to the present invention includes an insulating substrate having an electrode wiring pattern and an external connection electrode terminal connected to the electrode wiring pattern on the surface, and an electrode on the electrode wiring pattern of the insulating substrate. At least one blue light emitting element connected and mounted, a phosphor coated on the outer peripheral surface of the blue light emitting element, and an inner lens surface installed on the insulating substrate with respect to the blue light emitting element via an air layer And at least one lens having an outer lens surface and a lens support that supports and fixes the lens on an insulating substrate, the emitted light emitted from the blue light emitting element can be fully utilized. Since the freedom degree of light nature and diffusibility can be improved greatly, the subject of background art can be solved.

  It should be noted that the present invention is not limited to the above-described configurations and the configurations described in the embodiments described below, and it goes without saying that various modifications can be made without departing from the technical idea of the present invention. Yes.

  According to the light source device of the present invention, the lens is disposed between the organic light emitting element and the lens having the inner lens surface and the outer lens surface via the air layer, thereby causing the lens due to the refractive power of the air layer and the lens. Since the maximum lens effect due to the duality is obtained, the lens performance can be improved and the assembly man-hour reduction effect can be obtained at the same time.

  Further, according to the light source device of the present invention, since both lens surfaces can have a lens effect from the air layer, it becomes possible to extract the light emitted from the organic light emitting element to the maximum, and the loss of the light emitted. And the degree of freedom of light condensing and diffusing properties can be greatly improved, and light outside the effective area of the lens can be condensed and diffused at the same time.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings of the examples.

  1A and 1B are diagrams for explaining the configuration of a light source device according to a first embodiment of the present invention. FIG. 1A is a plan view seen from above, and FIG. 1B is a main part of FIG. Cross-sectional views are shown respectively. In FIG. 1, reference numeral 1 denotes a circuit board made of, for example, a glass epoxy resin material as an insulating substrate. On the surface of the circuit board 1, as shown in the plan view of the main part in FIG. As a conductive member, a plurality of sets of electrode wiring patterns 2 made of, for example, a metallic thick film such as gold or a thin film, and a common electrode pattern (not shown) are formed with a predetermined interval, and each end is provided with each of them. External connection electrode terminals 3 electrically connected to the electrode wiring pattern 2 and the common electrode pattern are integrally formed of the same metal film. The circuit board 1 may be a ceramic substrate instead of the glass epoxy substrate.

  In addition, on the plurality of sets of electrode wiring patterns 2 and common electrode patterns formed in the central portion on the circuit board 1, blue light emitting diodes 4b as three organic light emitting elements are electrically connected to the electrode terminals, respectively. Has been implemented. Further, on the circuit board 1 on which these blue light emitting diodes 4b are mounted, a phosphor paste containing a YAG phosphor in an organic solvent is screen-printed as shown in a cross-sectional view of the main part in FIG. Alternatively, the YAG phosphor film 5 is formed by coating by means such as a dropping method so as to cover the entire surface of the blue light emitting diode 4b.

  Further, on the circuit board 1 on which the phosphor film 5 is formed, the lens 6 having the inner lens surface 6i and the outer lens surface 6o covering the three blue light emitting diodes 4b has an epoxy resin-based peripheral edge. They are joined and fixed by a sealant 7. Therefore, an air layer 8 is formed between the phosphor film 5 and the inner lens surface 6 i of the lens 6. The lens 6 is formed of a molded body of a thermosetting resin material having translucency and heat resistance. The lens 6 may have an inner lens surface 6i and an outer lens surface 6o that are spherical or aspherical.

  The light source device configured as described above is driven by driving three blue light emitting diodes 4b connected in parallel between the power supply line 9 and the drive circuit 10 as shown in the block diagram of the main part in FIG. By the control of 10, the three blue light emitting diodes 4b are turned on and used at the same time.

  In such a configuration, the emitted light emitted from the three blue light emitting diodes 4b passes through the YAG phosphor film 5 and is emitted into the air layer 8 as white light. The white light is refracted by the inner lens surface 6i of the lens 6 and is incident on the inside of the lens 6, and is transmitted through the inside while propagating light. The white light transmitted through the inside is re-refracted by the outer lens 6o with a different refractive index and projected as a substantially cylindrical white light beam 12 toward the illumination surface 11 as shown in a perspective view of the main part in FIG.

  According to such a configuration, the air layer 8 is formed between the three blue light emitting diodes 4b and the lens 6, so that the lens 6 having the air layer 8, the inner lens surface 6i, and the outer lens surface 6o. The maximum lens effect due to the dihedral nature of the lens 6 can be obtained due to the difference in refractive index between the blue light-emitting diode and the light-emitting diode 4b. Therefore, a highly efficient white light beam 12 is applied to the illumination surface 11.

  In addition, according to such a configuration, the air layer 8 is formed between the three blue light emitting diodes 4b and the lens 6, thereby having the air layer 8, the inner lens surface 6i, and the outer lens surface 6o. Due to the difference in refractive index with the lens 6, the degree of freedom of light condensing and diffusing properties can be improved. Further, the light outside the lens effective light emitted from the blue light emitting diode 4b using the outside of the lens effective area of the lens 6 (the peripheral edge of the lens 6) can also be condensed and diffused.

  Furthermore, according to such a configuration, the lens 6 is formed from a thermosetting resin material having heat resistance, and the circuit board 1 is formed from a glass epoxy resin substrate or ceramic substrate having heat resistance. Since each component can be mounted by the component mounting apparatus performed in the atmosphere, the mounting cost and the assembly cost can be reduced.

  5A and 5B are diagrams for explaining the configuration of the light source device according to the second embodiment of the present invention. FIG. 5A is a plan view seen from above, and FIG. 5B is a main part of FIG. Cross-sectional views are respectively shown, and the same reference numerals are given to substantially the same parts as those in the above-described drawings, and the description thereof is omitted. 5 differs from FIG. 1 in that a plurality of sets of electrode wiring patterns 2 and a common electrode pattern formed on the surface of the circuit board 1 at equal intervals are formed as organic light emitting elements that emit multiple colors. A red light emitting diode 4r, a green light emitting diode 4g, and a blue light emitting diode 4b are respectively mounted with their electrode terminals electrically connected. In this configuration, a phosphor film is not formed on the red light emitting diode 4r, the green light emitting diode 4g, and the blue light emitting diode 4b.

  In the light source device configured as described above, a red light emitting diode 4r, a green light emitting diode 4g, and a blue light emitting diode 4b are connected in parallel between the power supply line 9 and the drive circuit 10 as shown in the block diagram of the main part in FIG. The drive circuit 10 controls the current values so that the light emitting diodes have substantially the same light emission luminance, and the red light emitting diode 4r, the green light emitting diode 4g, and the blue light emitting diode 4b are turned on simultaneously. Used.

  In such a configuration, each color light emitted from the red light emitting diode 4r, the green light emitting diode 4g, and the blue light emitting diode 4b is emitted into the air layer 8, and is mixed in the air layer 8 to become white light. The white light is refracted by the inner lens surface 6i of the lens 6 and is incident on the inside of the lens 6, and is transmitted through the inside while propagating light. The white light transmitted through the inside is re-refracted by the outer lens 6o with a different refractive index and projected as a substantially cylindrical white light beam 12 toward the illumination surface 11 as shown in a perspective view of the main part in FIG.

  Even in such a configuration, the air layer 8 is formed between the three-color light emitting diodes 4r, 4g, 4b and the lens 6, so that the air layer 8, the inner lens surface 6i, and the outer lens 8 are formed in the same manner as described above. Because of the difference in refractive index with the lens 6 having the lens surface 6o, the maximum lens effect due to the duality of the lens 6 can be provided, so that the loss of light amount from each color scheme is reduced and the light emission amount is maximized. Therefore, a highly efficient white light beam 12 is applied to the illumination surface 11.

  Also in such a configuration, the air layer 8 is formed between the three-color light emitting diodes 4r, 4g, 4b and the lens 6 in the same manner as described above, so that the air layer 8 and the inner lens surface 6i are formed. And the difference in refractive index with the lens 6 having the outer lens surface 6o can improve the light condensing and diffusing degrees of freedom. In addition, light outside the lens effective area emitted from the three-color light emitting diodes 4r, 4g, and 4b using the area outside the lens effective area of the lens 6 (periphery of the lens 6) can be condensed and diffused.

  In the second embodiment, the case where the red light emitting diode 4r, the green light emitting diode 4g, and the blue light emitting diode 4b are mounted on the circuit board 1 has been described. However, the present invention is not limited to this. In addition to the three-color light emitting diodes 4r, 4g, 4b, white light emitting diodes may be mounted on the same surface. As a result, the amount of white light emitted from the lens 6 to the outside can be increased.

  FIG. 7 is a cross-sectional view of the main part for explaining the configuration of the light source device according to the third embodiment of the present invention. In FIG. In FIG. 7, the difference from FIG. 1 is between the circuit board 1 on which the phosphor film 5 is formed so as to cover the plurality of blue light emitting diodes 4b and the lens 6A having the inner lens surface 6i and the outer lens surface 6o. The holder 13 having a spherical surface 13 a on the inner wall surface is joined and fixedly arranged by the sealing material 7.

  Also in this case, an air layer 8 is formed between the phosphor film 5 and the inner lens surface 6i of the lens 6A, and the inner lens surface 6i and the outer lens surface 6o of the lens 6A have a lens effect. This lens 6A is also formed of a molded body of a thermosetting resin material having translucency and heat resistance. The holder 13 is formed of a molded body of, for example, an epoxy thermosetting resin material having high light reflectivity and heat resistance on the spherical surface 13a of the inner wall surface. The spherical surface 13a formed on the inner wall surface of the holder 13 may be formed in an aspherical shape.

  In such a configuration, the holder 13 having the inner wall surface formed with the spherical surface 13a is interposed between the circuit board 1 and the lens 6A, thereby reducing the loss of light quantity from the plurality of blue light emitting diodes 4b. Since the light emitted from the blue light emitting diode 4b can be extracted to the maximum and the light outside the effective range of the lens 6A can be further condensed, the performance of the light source device can be improved.

  Further, in such a configuration, since the lens 6A and the holder 13 are formed of a heat-resistant resin material, mounting and reflow can be performed by the mounter, so that mounting cost and assembly cost can be reduced, and productivity can be reduced. Can be improved.

  FIG. 8 is a cross-sectional view of an essential part for explaining the configuration of the light source device according to Embodiment 4 of the present invention. The same reference numerals are given to the same parts as those in FIG. 8 differs from FIG. 1 in that an inner lens surface 6i and an outer lens surface 6o are provided on the circuit board 1 on which the phosphor film 5 is formed so as to cover the blue light emitting diode 4b, and at the outer peripheral edge portion. An inner lens 6B having a concave engagement groove 6k is joined and fixed by a sealing material 7, and further has an inner lens surface 6i and an outer lens surface 6o above the inner lens 6B. An outer lens 6C having a convex engaging claw 61 is disposed, and the outer lens 6C is mounted with the engaging claw 61 being fitted into the engaging groove 6k of the inner lens 6B.

  Accordingly, the first air layer 8a is formed between the circuit board 1 on which the phosphor film 5 is formed so as to cover the plurality of blue light emitting diodes 4b and the inner lens 6B having the inner lens surface 6i and the outer lens surface 6o. The second air layer 8b is formed between the inner lens 6B and the outer lens 6C. Since the inner lens 6B is formed of a translucent heat-resistant resin material, it can be mounted and reflowed by a mounter, so that the mounting cost and assembly cost can be reduced and the productivity can be improved. Can do.

  In such a configuration, the inner lens 6B and the outer lens 6C are placed on the circuit board 1 on which the plurality of blue light emitting diodes 4b are disposed via the first air layer 8a and the second air layer 8b, respectively. By laminating and mounting, the inner lens 6B and the outer lens 6C can have a four-surface lens effect, so that improvement of optical characteristics such as chromatic aberration, which was difficult to improve with a single lens, is intended. In addition, the degree of freedom of diffusion and condensing can be further improved as compared with a single lens. Further, the outer lens 6C can be removed depending on the situation by forming the convex engagement claws 61 on the outer peripheral edge thereof.

  In each of the above-described embodiments, a wire is used as means for electrically connecting the electrode terminals of the respective color light emitting diodes 4r, 4g, 4b between each electrode wiring pattern 2 on the circuit board 1 and a common electrode pattern (not shown). Any method such as a bonding method or a flip-chip method can be used.

  In each of the above-described embodiments, the case where the phosphor film 5 is formed on the plurality of blue light emitting diodes 4b has been described. However, the present invention is not limited to this, and the blue light emitting diode 4b is not limited thereto. Of course, it is possible to use a blue light emitting diode having a phosphor film deposited on the surface thereof. In this case, it is not necessary to form the phosphor film 5 as shown in FIG. Needless to say.

  It is a figure which shows the structure of Example 1 of the light source device by this invention.   It is a figure which shows the structure on the circuit board of the light source device shown in FIG.   It is a block diagram which shows the drive circuit of the light source device by Example 1 of this invention.   It is a figure which shows the light beam by the light source device by this invention.   It is a figure which shows the structure of Example 2 of the light source device by this invention.   It is a block diagram which shows the drive circuit of the light source device by Example 2 of this invention.   It is principal part sectional drawing which shows the structure by Example 3 of the light source device by this invention.   It is principal part sectional drawing which shows the structure by Example 4 of the light source device by this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Circuit board, 2 ... Electrode wiring pattern, 3 ... External connection electrode terminal, 4r ... Red light emitting diode, 4g ... Green light emitting diode, 4b ... Blue light emitting diode, 5 ... phosphor film, 6 ... lens, 6A ... lens, 6B ... lens, 6C ... lens, 6i ... inner lens surface, 6o ... outer lens surface, 7 ... Sealing agent, 8 ... air layer, 9 ... power line, 10 ... drive circuit, 11 ... illumination surface, 12 ... luminous flux, 13 ... holder, 13a ... spherical surface .

Claims (10)

An insulating substrate having an electrode wiring pattern on the surface and an electrode terminal for external connection connected to the electrode wiring pattern;
An organic light-emitting element that emits multiple colors and is electrically connected and mounted on the electrode wiring pattern of the insulating substrate;
A lens having an inner lens surface and an outer lens surface that are installed on the organic light emitting element via an air layer and fixed on the insulating substrate;
A light source device comprising: An insulating substrate having an electrode wiring pattern on the surface and an electrode terminal for external connection connected to the electrode wiring pattern;
An organic light-emitting element that emits multiple colors and is electrically connected and mounted on the electrode wiring pattern of the insulating substrate;
At least one lens having an inner lens surface and an outer lens surface installed on the insulating substrate via an air layer with respect to the organic light emitting element;
A lens support for supporting and fixing the lens on the insulating substrate;
A light source device comprising:   The light source device according to claim 1, wherein the organic light emitting element is a red light emitting element, a green light emitting element, a blue light emitting element, or a white light emitting element. An insulating substrate having an electrode wiring pattern on the surface and an electrode terminal for external connection connected to the electrode wiring pattern;
At least one blue light-emitting element mounted in an electrically connected manner on the electrode wiring pattern of the insulating substrate;
A phosphor coated on the outer peripheral surface of the blue light emitting element;
At least one lens having an inner lens surface and an outer lens surface installed on the insulating substrate via an air layer with respect to the blue light emitting element;
A light source device comprising: An insulating substrate having an electrode wiring pattern on the surface and an electrode terminal for external connection connected to the electrode wiring pattern;
At least one blue light-emitting element mounted in an electrically connected manner on the electrode wiring pattern of the insulating substrate;
A phosphor coated on the outer peripheral surface of the blue light emitting element;
At least one lens having an inner lens surface and an outer lens surface installed on the insulating substrate via an air layer with respect to the blue light emitting element;
A lens support for supporting and fixing the lens on the insulating substrate;
A light source device comprising:   The light source device according to claim 4, wherein the phosphor is a YAG phosphor.   The light source device according to claim 1, wherein the lens is an aspheric lens.   The light source device according to claim 1, wherein the lens is a spherical lens.   The light source device according to claim 7 or 8, wherein the lens is formed of a molded body of a heat-resistant resin material.   The light source device according to claim 1, wherein the lens is supported and fixed to the insulating substrate via a sealant.

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