WO2008015887A1 - Illuminating apparatus and imaging apparatus - Google Patents

Illuminating apparatus and imaging apparatus Download PDF

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Publication number
WO2008015887A1
WO2008015887A1 PCT/JP2007/063780 JP2007063780W WO2008015887A1 WO 2008015887 A1 WO2008015887 A1 WO 2008015887A1 JP 2007063780 W JP2007063780 W JP 2007063780W WO 2008015887 A1 WO2008015887 A1 WO 2008015887A1
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WO
WIPO (PCT)
Prior art keywords
led
condenser lens
light
aspherical
lens
Prior art date
Application number
PCT/JP2007/063780
Other languages
French (fr)
Japanese (ja)
Inventor
Toyohiko Mizota
Masashi Matono
Original Assignee
Yoshikawa Kasei Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yoshikawa Kasei Co., Ltd. filed Critical Yoshikawa Kasei Co., Ltd.
Publication of WO2008015887A1 publication Critical patent/WO2008015887A1/en

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G03B15/02—Illuminating scene
    • G03B15/03—Combinations of cameras with lighting apparatus; Flash units
    • G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F21V5/048—Refractors for light sources of lens shape the lens being a simple lens adapted to cooperate with a point-like source for emitting mainly in one direction and having an axis coincident with the main light transmission direction, e.g. convergent or divergent lenses, plano-concave or plano-convex lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units
    • G03B2215/0564—Combinations of cameras with electronic flash units characterised by the type of light source
    • G03B2215/0567—Solid-state light source, e.g. LED, laser
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2215/00—Special procedures for taking photographs; Apparatus therefor
    • G03B2215/05—Combinations of cameras with electronic flash units
    • G03B2215/0589—Diffusors, filters or refraction means
    • G03B2215/0592—Diffusors, filters or refraction means installed in front of light emitter
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements

Definitions

  • Illumination device and imaging device are Illumination device and imaging device
  • the present invention relates to a lighting device using an LED (Light Emitting Diode) and an imaging device technology using the lighting device.
  • LED Light Emitting Diode
  • Patent Document 1 discloses a technique for reducing color unevenness.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2003-16808
  • Patent Document 2 As a technique for preventing the occurrence of color unevenness, as shown in Patent Document 2, it is common to use a light diffusion sheet.
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2004-45471
  • the color of irradiation light as a lighting device can be realized by only a single LED V. This is because the structure is simple and the cost can be reduced.
  • the technique described in Patent Document 1 is based on the premise that a plurality of LEDs are used, and is not suitable as a technique for suppressing the occurrence of color unevenness in a lighting device composed of only a single LED. It cannot be used for lighting devices that use a single LED.
  • the technique described in Patent Document 2 has an insufficient aspect of a technique using a light diffusion sheet as a technique for eliminating the uneven illumination of the LED and not reducing the illuminance.
  • the problem to be solved by the present invention is to provide a lighting device capable of realizing a desired color of irradiation light with only a single LED, and suppressing color unevenness without reducing illuminance, and an imaging apparatus using the same. It is to provide.
  • the object of the invention according to claim 1 to claim 3 is that the desired color of the irradiation light can be realized by only a single LED, and the color unevenness can be suppressed without reducing the illuminance. It is to provide lighting equipment.
  • the object of the invention described in claim 4 is to provide an imaging device using an illuminating device that can realize a desired color of irradiating light with only a single LED and can suppress uneven color without reducing illuminance. It is to provide.
  • the invention according to claim 1 relates to an illuminating device that irradiates a light beam emitted from an LED by collecting the light beam with two condenser lenses.
  • the base substrate (50) to which the power supply member is fixed the LED (ll) mounted on the base substrate (50), and the first aspherical surface disposed on the opposite side of the LED (ll).
  • the first condenser lens (40) is characterized by containing 0.01 to 1% by weight of a light diffusing agent with respect to the synthetic resin raw material.
  • LED is not limited to a blue light emitting diode.
  • it includes a composite LED with RGB in one package.
  • the “light diffusing agent” known ones are employed. 0.0.01% by weight or less It is unreasonable because it cannot mix colors. On the other hand, if it is 1.0% by weight or more, the illuminance decreases, which is unreasonable.
  • the first condenser lens (20) has a light diffusing action, the light diffusing sheet necessary in the prior art can be omitted. This simplifies the structure and assembly process of the lighting device.
  • the “light diffusion sheet” has a performance of diffusing to a predetermined angle (for example, 60 degrees) when parallel light is incident.
  • the material is polycarbonate, for example.
  • the invention according to claim 2 also relates to an illuminating device that irradiates a light beam emitted from an LED by condensing the light beam by two condensing lenses.
  • the base substrate (50) to which the power supply member is fixed the LED (ll) mounted on the base substrate (50), and the first aspherical surface disposed on the opposite side of the LED (ll).
  • a condenser lens (20), and an aspherical second condenser lens (40) disposed on the opposite side of the LED (ll) with respect to the first condenser lens (20) The second condenser lens (40) is characterized in that the light diffusing agent is contained in an amount of 0.01 to 1% by weight with respect to the synthetic resin raw material.
  • the second condenser lens (40) since the second condenser lens (40) has a light diffusing action, a light diffusing sheet that is necessary in the prior art can be omitted. This simplifies the structure and assembly process of the lighting device.
  • One of the first condenser lens (20) and the second condenser lens (40) is characterized in that a condenser lens containing no light diffusing agent is colored.
  • the invention according to claim 4 relates to an imaging device that employs the LED lighting device according to claims 1 to 3.
  • Examples of the "imaging device” include a digital camera and a mobile phone with a camera function.
  • the imaging device can use an illumination device with little color unevenness as auxiliary light, it contributes to improving the quality of a captured image.
  • an LED lighting device that can realize a desired color of irradiation light with only a single LED and can suppress color unevenness without reducing illuminance. could be provided.
  • an imaging device using an illumination device that can realize a desired color of irradiation light with only a single LED and can suppress uneven color without reducing illuminance. Delivered with power S.
  • FIG. 1 is a side sectional view showing a lighting device according to a first embodiment.
  • FIG. 2 is a side sectional view showing a lighting device according to a second embodiment.
  • Lens holder 70 A Lens holder
  • FIG. 1 is a side sectional view showing the lighting apparatus according to the first embodiment.
  • FIG. 2 is a side sectional view showing the lighting apparatus according to the second embodiment.
  • the illuminating device 10 condenses the incident light beam from the LED 11 (light source) by a plurality of condensing lenses 20 and 40 having different shapes, and is irradiated as an emitted light beam having a different light distribution. It is an illuminating device for irradiating a body (located in the upper part in the figure).
  • a cylindrical inner sleeve 80 having an inner diameter dimension of the lens holder 70 as an outer dimension is interposed between the first condenser lens 20 and the second condenser lens 40. Further, a ring-shaped outer sleeve 90 having an inner diameter dimension of the lens holder 70 as an outer dimension is fixed to the anti-first condenser lens 20 side of the second condenser lens 40.
  • the first condenser lens 20 contains 0.01 to 1% by weight of a light diffusing agent with respect to the synthetic resin raw material.
  • the second condenser lens 40 is colored.
  • a coloring method a dye that enables desired coloring to the synthetic resin is used. The reason for coloring is that light different from the color emitted by the LED 11 may be desired.
  • the condensing lens that does not contain a light diffusing agent can meet the demand. In the case of white, it is not colored. [0029] According to the embodiment as described above, the irradiation unevenness can be eliminated without reducing the illuminance. In addition, since the first condensing lens 20 has a light diffusing action, a light diffusing sheet that is necessary in the prior art can be omitted. This simplifies the structure of the lighting device and the assembly process.
  • a light diffusing agent may be contained in the synthetic resin raw material that is the material of the second condenser lens 40. Even in that case, the irradiation unevenness can be eliminated without reducing the illuminance.
  • the first condenser lens 20 is colored.
  • the base substrate 50 is made of a metal material such as metal. For this reason, the heat is stored in the interior of the LED 11, and the heat dissipation efficiency is such that the heat is efficiently dissipated to the outside.
  • the LED11 adopts 1W noise power LED.
  • the LED11 has a rectangular parallelepiped shape that is 2.8mm long, 3.4mm wide, and 1.15mm high. Further, light beams having substantially the same light distribution angle (for example, directivity (full width at half maximum) standard value of about 120 °) are emitted toward the first condenser lens 20 side.
  • the installation location is arranged at the center of the upper surface 51 of the base substrate 50.
  • the LED 11 in the present embodiment employs a white LED, and is formed as an LED capable of realizing white light with a blue LED chip (not shown) and a yellow phosphor. For this reason, the irradiated light is white light.
  • the condensing lenses 20 and 40 are held by a ring-shaped inner sleeve 80 and an outer sleeve 90 inside a cylindrical lens holder 70.
  • the lens holder 70, the inner sleeve 80, and the outer sleeve 90 are each formed of a metal material such as aluminum. For this reason, it is a material that promotes heat dissipation so that the heat stored inside by LED11 can be efficiently dissipated to the outside. [0034] (Condenser lens)
  • the first condenser lens 20 has a flat surface on the LED 11 side and a convex surface on the anti-LED 11 side. This convex surface has an aspherical shape, and effectively condenses the light flux from the LED.
  • the second condenser lens 40 has a surface on the first condenser lens 20 side and an anti-first condenser lens 20 side. The surface is also convex. Both the convex surface on the first condensing lens 20 side and the convex surface on the anti-first condensing lens 20 side are aspherical and effectively collect the light flux from the LED.
  • the second embodiment employs the light diffusion sheet 30 without mixing a light diffusing agent in the production of the first condenser lens 20A and the second condenser lens 40A.
  • the light diffusion sheet 30 in the present embodiment uses a sheet that diffuses and emits at about 60 ° when an incident light beam from the LED 11A is incident as parallel light.
  • the height of the light diffusion sheet was about 0.25 mm, the diameter was 8.4 mm, and the circumference was 26.39 mm.
  • the distance from the LED 11A to the light diffusion sheet 30 is 0.95 mm.
  • the distance from the upper surface of the light diffusion sheet 30 to the bottom of the inner lens 20A is 0.68 mm.
  • the distance from the top of the first condenser lens 20A to the bottom of the second condenser lens 40A is 0.1 mm.
  • Examples of the material of the first condenser lens 20A and the second condenser lens 40A include translucent resins such as acrylic, COP (cycloolefin polymer), and COC (cycloolefin copolymer). A heat resistant resin or the like can be used.
  • Either or both of the first condenser lens 20A and the second condenser lens 40A contain a colorant to produce a desired light color.
  • Each lens contains a light diffusing agent, so it can be colored freely.
  • the spot of the light irradiated to the irradiated object and the edge thereof become very “clear” spot light.
  • the light distribution can be uniformly controlled by the diffusion sheet 30, uneven color and uneven illumination are reduced.
  • LED11 and LED11A in this embodiment have shown the example which employ
  • the present invention does not include ultraviolet rays, the present invention is most suitable as illumination in an object that dislikes ultraviolet light (for example, exhibits in museums and museums), hospitals, and the like.
  • the present invention is also suitable for illuminating fine arts and products.
  • the boundary between the illumination surface and the non-illumination surface (edge) enables clear illumination, it is also suitable for reading lamps where diffuse light to the surroundings becomes a problem.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Led Device Packages (AREA)
  • Stroboscope Apparatuses (AREA)

Abstract

Provided is an LED illuminating apparatus which can suppress color nonuniformity with a simple structure. The LED illuminating apparatus is provided with a base substrate (50) whereupon a power supply member is fixed; an LED (11) mounted on the base substrate (50); an aspherical first light collecting lens (20) arranged on a side opposite to the LED (11); and an aspherical second light collecting lens (40) arranged on the first light collecting lens (20) on a side opposite to the LED (11). The first light collecting lens (40) contains a light diffusing agent of 0.01-1wt% to a synthetic resin material which is a material for the first light collecting lens.

Description

明 細 書  Specification
照明装置および撮像装置  Illumination device and imaging device
技術分野  Technical field
[0001] 本発明は、 LED (Light Emitting Diode)を用いた照明装置およびその照明装置を 用いた撮像装置の技術に関する。  The present invention relates to a lighting device using an LED (Light Emitting Diode) and an imaging device technology using the lighting device.
背景技術  Background art
[0002] 白熱灯や蛍光灯に比べ省電力でランニングコストが安い、また、蛍光灯のように水 銀などの有害物質を使用していないなどの観点から、照明用途として LEDに対する 期待が大きい。  [0002] There are high expectations for LEDs as lighting applications from the viewpoints of low power consumption and low running costs compared to incandescent and fluorescent lamps, and that no harmful substances such as mercury are used like fluorescent lamps.
しかし、 LEDを照明装置に用いる場合、高照度の実現は可能であるものの、照射 面に色むらが発生するという問題があった。  However, when LEDs are used in lighting devices, although high illuminance is possible, there is a problem that uneven color occurs on the irradiated surface.
[0003] 上記の問題に対し、特許文献 1では、色むらを低減させるための技術が開示されて いる。 [0003] With respect to the above problem, Patent Document 1 discloses a technique for reducing color unevenness.
すなわち、 LEDからの放射光全てがレンズ部の所定部分に集中的に集光されてか ら外部に放射されるために、レンズ部内で十分に混色させることができるので、色む らの発生を防止できると!/、う技術である。  In other words, since all of the emitted light from the LED is concentrated on a predetermined part of the lens and then emitted to the outside, it can be mixed well within the lens, thereby preventing color unevenness. It can be prevented!
[0004] 特許文献 1：特開 2003— 16808号公報 [0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-16808
[0005] 一方、色むらの発生を防止する技術としては、特許文献 2に示すように、光拡散シ ートを用いることが一般的である。  On the other hand, as a technique for preventing the occurrence of color unevenness, as shown in Patent Document 2, it is common to use a light diffusion sheet.
[0006] 特許文献 2：特開 2004— 45471号公報 [0006] Patent Document 2: Japanese Patent Application Laid-Open No. 2004-45471
発明の開示  Disclosure of the invention
発明が解決しょうとする課題  Problems to be solved by the invention
[0007] さて、照明装置としての照射光の色は、単一の LEDのみで実現できるものが好まし V、。構造がシンプルでコストも抑えられるからである。 [0007] Now, it is preferable that the color of irradiation light as a lighting device can be realized by only a single LED V. This is because the structure is simple and the cost can be reduced.
しかし、特許文献 1に記載された技術は複数の LEDを使用することを前提としてお り、単一の LEDのみで構成する照明装置の色むらの発生を抑える技術としては向い ておらず、単一の LEDにて構成しょうという照明装置には採用できない。 [0008] また、特許文献 2に記載された技術は、 LEDの照射むらを消しつつ、照度を落とさ ないための技術としては、光拡散シートを用いる技術では不十分な面もあった。 However, the technique described in Patent Document 1 is based on the premise that a plurality of LEDs are used, and is not suitable as a technique for suppressing the occurrence of color unevenness in a lighting device composed of only a single LED. It cannot be used for lighting devices that use a single LED. [0008] Further, the technique described in Patent Document 2 has an insufficient aspect of a technique using a light diffusion sheet as a technique for eliminating the uneven illumination of the LED and not reducing the illuminance.
[0009] 以上から明らかなように、所望される照射光の色を単一の LEDのみで実現でき、照 度を落とさずに色むらが抑制可能な照明器具およびそれを用いた撮像装置は実現 していなかった。  [0009] As is apparent from the above, a luminaire that can achieve the desired color of illumination light with only a single LED and that can suppress color unevenness without reducing illumination, and an imaging device using the same are realized. I did not.
本発明が解決しょうとする課題は、所望される照射光の色を単一の LEDのみで実 現でき、照度を落とさずに色むらが抑制可能な照明器具およびそれを用いた撮像装 置を提供することにある。  The problem to be solved by the present invention is to provide a lighting device capable of realizing a desired color of irradiation light with only a single LED, and suppressing color unevenness without reducing illuminance, and an imaging apparatus using the same. It is to provide.
[0010] ここで、請求項 1から請求項 3に記載の発明の目的は、所望される照射光の色を単 一の LEDのみで実現でき、照度を落とさずに色むらが抑制可能な LED照明装置を 提供することである。 [0010] Here, the object of the invention according to claim 1 to claim 3 is that the desired color of the irradiation light can be realized by only a single LED, and the color unevenness can be suppressed without reducing the illuminance. It is to provide lighting equipment.
また、請求項 4に記載の発明の目的は、所望される照射光の色を単一の LEDのみ で実現でき、照度を落とさずに色むらが抑制可能な照明装置を用いた撮像装置を提 供することである。  Further, the object of the invention described in claim 4 is to provide an imaging device using an illuminating device that can realize a desired color of irradiating light with only a single LED and can suppress uneven color without reducing illuminance. It is to provide.
課題を解決するための手段  Means for solving the problem
[0011] (請求項 1) [0011] (Claim 1)
請求項 1記載の発明は、 LEDから発せられた光束を二枚の集光レンズによって集 光させて照射させる照明装置に係る。  The invention according to claim 1 relates to an illuminating device that irradiates a light beam emitted from an LED by collecting the light beam with two condenser lenses.
すなわち、電源供給部材を固定したベース基板 (50)と、 そのベース基板 (50)に実 装される LED(l l)と、 その LED(l l)とは反対側に配置した非球面形状の第一集光 レンズ (20)と、 その第一集光レンズ (20)に対して前記 LED(l l)とは反対側に配置し た非球面形状の第二集光レンズ (40)とを備え、 前記の第一集光レンズ (40)は、その 材質である合成樹脂原料に対して光拡散剤を 0. 01乃至 1重量％を含有させたこと を特徴とする。  That is, the base substrate (50) to which the power supply member is fixed, the LED (ll) mounted on the base substrate (50), and the first aspherical surface disposed on the opposite side of the LED (ll). A condenser lens (20), and an aspherical second condenser lens (40) disposed on the opposite side of the LED (ll) with respect to the first condenser lens (20), The first condenser lens (40) is characterized by containing 0.01 to 1% by weight of a light diffusing agent with respect to the synthetic resin raw material.
[0012] (用語説明） [0012] (Glossary)
「LED」は、青色発光ダイオードに限らない。例えば、 RGBをワンパッケージ化した 複合 LEDも含む。  “LED” is not limited to a blue light emitting diode. For example, it includes a composite LED with RGB in one package.
「光拡散剤」としては、既知のものが採用される。 0. 01重量％以下とすると、十分に 混色出来ないので不合理である。また、 1. 0重量％以上とすると、照度が落ちてしま うので不合理である。 As the “light diffusing agent”, known ones are employed. 0.0.01% by weight or less It is unreasonable because it cannot mix colors. On the other hand, if it is 1.0% by weight or more, the illuminance decreases, which is unreasonable.
[0013] (作用）  [0013] (Function)
上記のような構造により、照度を落とさずに、照射むらを消すことができる。 また、第一集光レンズ (20)に光拡散作用を担わせたので、従来技術では必要であ つた光拡散シートを省略することができる。このため、照明装置の構造、組み立てェ 程などが単純化される。  With the above-described structure, it is possible to eliminate the irradiation unevenness without reducing the illuminance. In addition, since the first condenser lens (20) has a light diffusing action, the light diffusing sheet necessary in the prior art can be omitted. This simplifies the structure and assembly process of the lighting device.
なおここで、「光拡散シート」とは、平行光が入射した場合に所定角度（例えば 60度 )へ拡散するという性能を有する。材質は、例えばポリカーボネートである。  Here, the “light diffusion sheet” has a performance of diffusing to a predetermined angle (for example, 60 degrees) when parallel light is incident. The material is polycarbonate, for example.
[0014] (請求項 2) [0014] (Claim 2)
請求項 2に記載の発明もまた、 LEDから発せられた光束を二枚の集光レンズによつ て集光させて照射させる照明装置に係る。  The invention according to claim 2 also relates to an illuminating device that irradiates a light beam emitted from an LED by condensing the light beam by two condensing lenses.
すなわち、電源供給部材を固定したベース基板 (50)と、 そのベース基板 (50)に実 装される LED(l l)と、 その LED(l l)とは反対側に配置した非球面形状の第一集光 レンズ (20)と、 その第一集光レンズ (20)に対して前記 LED(l l)とは反対側に配置し た非球面形状の第二集光レンズ (40)とを備え、 前記の第二集光レンズ (40)は、その 材質である合成樹脂原料に対して光拡散剤を 0. 01乃至 1重量％を含有させたこと を特徴とする。  That is, the base substrate (50) to which the power supply member is fixed, the LED (ll) mounted on the base substrate (50), and the first aspherical surface disposed on the opposite side of the LED (ll). A condenser lens (20), and an aspherical second condenser lens (40) disposed on the opposite side of the LED (ll) with respect to the first condenser lens (20), The second condenser lens (40) is characterized in that the light diffusing agent is contained in an amount of 0.01 to 1% by weight with respect to the synthetic resin raw material.
[0015] 上記のような構造によっても、照度を落とさずに、照射むらを消すことができる。  [0015] Even with the above-described structure, it is possible to eliminate uneven irradiation without reducing the illuminance.
また、第二集光レンズ (40)に光拡散作用を担わせたので、従来技術では必要であ つた光拡散シートを省略することができる。このため、照明装置の構造、組み立てェ 程などが単純化される。  In addition, since the second condenser lens (40) has a light diffusing action, a light diffusing sheet that is necessary in the prior art can be omitted. This simplifies the structure and assembly process of the lighting device.
[0016] (請求項 3) [0016] (Claim 3)
請求項 3に記載の発明は、請求項 1または請求項 2のいずれかに記載の LED照明 装置を限定したものであり、  The invention described in claim 3 limits the LED lighting device according to either claim 1 or claim 2,
前記第一集光レンズ (20)および前記第二集光レンズ (40)のいずれか一方のうち、光 拡散剤を含有しない集光レンズに着色を施したことを特徴とする。  One of the first condenser lens (20) and the second condenser lens (40) is characterized in that a condenser lens containing no light diffusing agent is colored.
集光レンズへの着色方法としては、合成樹脂に染料を混入させるなどの従来技術 が採用される。 Conventional methods for coloring condensing lenses, such as mixing dyes into synthetic resins Is adopted.
[0017] LED(l l)が発光する色とは別の光が要望される場合がある。このような場合、光拡 散剤を含有しなレ、集光レンズに着色することで、その要望に応えることができる。  [0017] In some cases, light different from the color emitted by the LED (l l) is desired. In such a case, it is possible to meet the demand by coloring the condensing lens without containing a light diffusing agent.
[0018] (請求項 4)  [0018] (Claim 4)
請求項 4に記載の発明は、請求項 1から請求項 3に記載の LED照明装置を採用し た撮像装置に係る。  The invention according to claim 4 relates to an imaging device that employs the LED lighting device according to claims 1 to 3.
[0019] 「撮像装置」としては、例えば、デジタルカメラ、カメラ機能付き携帯電話などが挙げ られる。  [0019] Examples of the "imaging device" include a digital camera and a mobile phone with a camera function.
本請求項に係る撮像装置は、色むらが少ない照明装置を補助光として使えるので 、撮影する画像の品質向上に貢献する。  Since the imaging device according to the present invention can use an illumination device with little color unevenness as auxiliary light, it contributes to improving the quality of a captured image.
発明の効果  The invention's effect
[0020] 請求項 1から請求項 3に記載の発明によれば、所望される照射光の色を単一の LE Dのみで実現でき、照度を落とさずに色むらが抑制可能な LED照明装置を提供する ことができた。  [0020] According to the invention described in claim 1 to claim 3, an LED lighting device that can realize a desired color of irradiation light with only a single LED and can suppress color unevenness without reducing illuminance. Could be provided.
また、請求項 4に記載の発明によれば、所望される照射光の色を単一の LEDのみ で実現でき、照度を落とさずに色むらが抑制可能な照明装置を用いた撮像装置を提 供すること力 Sでさた。  Further, according to the invention described in claim 4, there is provided an imaging device using an illumination device that can realize a desired color of irradiation light with only a single LED and can suppress uneven color without reducing illuminance. Delivered with power S.
図面の簡単な説明  Brief Description of Drawings
[0021] [図 1]第一の実施形態に係る照明装置を示す側断面図である。  FIG. 1 is a side sectional view showing a lighting device according to a first embodiment.
[図 2]第二の実施形態に係る照明装置を示す側断面図である。  FIG. 2 is a side sectional view showing a lighting device according to a second embodiment.
符号の説明  Explanation of symbols
[0022] 10 照明装置 10A 照明装置 [0022] 10 lighting device 10A lighting device
11 LED 11A LED  11 LED 11A LED
20 第一集光レンズ 20A 第一集光レンズ  20 First condenser lens 20A First condenser lens
30 光拡散シート  30 Light diffusion sheet
40 第二集光レンズ 40A 第二集光レンズ  40 Second condenser lens 40A Second condenser lens
50 ベース基板 50A ベース基盤 60 LEDホルダ 50 base board 50A base board 60 LED holder
70 レンズホルダ 70 A レンズホルダ  70 Lens holder 70 A Lens holder
80 内スリーブ 80A 内スリ  80 Inner sleeve 80A Inner sleeve
90 外スリーブ 90A 外スリーブ  90 outer sleeve 90A outer sleeve
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0023] 以下、本発明を実施の形態及び図面に基づいて、更に詳しく説明する。ここで使用 する図面は、図 1および図 2である。図 1は、第一の実施形態に係る照明装置を示す 側断面図である。図 2は、第二の実施形態に係る照明装置を示す側断面図である。  Hereinafter, the present invention will be described in more detail based on the embodiments and the drawings. The drawings used here are Figs. 1 and 2. FIG. 1 is a side sectional view showing the lighting apparatus according to the first embodiment. FIG. 2 is a side sectional view showing the lighting apparatus according to the second embodiment.
[0024] (全体構成） [0024] (Overall configuration)
図 1に示すように、照明装置 10は、 LED11 (光源)からの入射光束を、形状の異な る複数の集光レンズ 20、 40によって集光させて、配光の異なる出射光束として被照 射体（図中では上方に位置する）に照射する照明装置である。  As shown in FIG. 1, the illuminating device 10 condenses the incident light beam from the LED 11 (light source) by a plurality of condensing lenses 20 and 40 having different shapes, and is irradiated as an emitted light beam having a different light distribution. It is an illuminating device for irradiating a body (located in the upper part in the figure).
[0025] 照明装置 10は、 LED11を発光させるためのコネクタ（=電源供給部材、図示を省 略）が載置されたベース基板 50と、そのベース基板 50に固定された円筒状のレンズ ホノレダー 70と、そのレンズホルダー 70における前記 LED11寄りに位置して固定さ れる第一集光レンズ 20と、その第一集光レンズ 20における反 LED11側に位置して 固定される第二集光レンズ 40とを備えて!/、る。  The lighting device 10 includes a base substrate 50 on which a connector (= power supply member, not shown) for causing the LED 11 to emit light is mounted, and a cylindrical lens hono-redder 70 fixed to the base substrate 50. A first condenser lens 20 that is fixed near the LED 11 in the lens holder 70, and a second condenser lens 40 that is fixed on the opposite side of the LED 11 in the first condenser lens 20 With /!
[0026] 前記の第一集光レンズ 20および第二集光レンズ 40の間には、前記レンズホルダ 一 70の内径寸法を外形寸法とする円筒形の内スリーブ 80を介在させている。また、 前記第二集光レンズ 40における反第一集光レンズ 20側には、前記レンズホルダー 7 0の内径寸法を外形寸法とするリング状の外スリーブ 90を固定している。  [0026] Between the first condenser lens 20 and the second condenser lens 40, a cylindrical inner sleeve 80 having an inner diameter dimension of the lens holder 70 as an outer dimension is interposed. Further, a ring-shaped outer sleeve 90 having an inner diameter dimension of the lens holder 70 as an outer dimension is fixed to the anti-first condenser lens 20 side of the second condenser lens 40.
[0027] 前記の第一集光レンズ 20は、その材質である合成樹脂原料に対して光拡散剤を 0 . 01乃至 1重量％を含有させている。  [0027] The first condenser lens 20 contains 0.01 to 1% by weight of a light diffusing agent with respect to the synthetic resin raw material.
[0028] 一方、第二集光レンズ 40には、着色を施す。着色方法としては、合成樹脂に所望 の着色が可能となる染料を用いる。着色する理由は、前記 LED11が発光する色とは 別の光が要望される場合があるからである。 On the other hand, the second condenser lens 40 is colored. As a coloring method, a dye that enables desired coloring to the synthetic resin is used. The reason for coloring is that light different from the color emitted by the LED 11 may be desired.
このような場合、光拡散剤を含有しない集光レンズに着色することで、その要望に 応えること力 Sできる。なお、白色の場合には、着色しない。 [0029] 上記のような実施形態により、照度を落とさずに、照射むらを消すことができた。 また、第一集光レンズ 20に光拡散作用を担わせたので、従来技術では必要であつ た光拡散シートを省略することができる。このため、照明装置の構造、組み立て工程 などが単純化される。 In such a case, coloring the condensing lens that does not contain a light diffusing agent can meet the demand. In the case of white, it is not colored. [0029] According to the embodiment as described above, the irradiation unevenness can be eliminated without reducing the illuminance. In addition, since the first condensing lens 20 has a light diffusing action, a light diffusing sheet that is necessary in the prior art can be omitted. This simplifies the structure of the lighting device and the assembly process.
[0030] (バリエーション） [0030] (Variation)
前記の第一集光レンズ 20の代わりに第二集光レンズ 40の材質である合成樹脂原 料に対して光拡散剤を 0. 01乃至 1重量％を含有させることもできる。その場合でも、 照度を落とさずに、照射むらを消すことができる。  Instead of the first condenser lens 20, 0.01 to 1% by weight of a light diffusing agent may be contained in the synthetic resin raw material that is the material of the second condenser lens 40. Even in that case, the irradiation unevenness can be eliminated without reducing the illuminance.
なお、その場合に前記 LED11が発光する色とは別の光が要望されるのであれば、 第一集光レンズ 20に着色する。  In this case, if light different from the color emitted by the LED 11 is desired, the first condenser lens 20 is colored.
[0031] (ベース基板） [0031] (Base substrate)
前記のベース基板 50の材質としては、メタル等の金属製材質によって形成されて いる。このため、 LED11によって内部に蓄熱された熱力 効率よく外部に放熱される ような放熱促進効果が図られる材質となっている。  The base substrate 50 is made of a metal material such as metal. For this reason, the heat is stored in the interior of the LED 11, and the heat dissipation efficiency is such that the heat is efficiently dissipated to the outside.
[0032] (LED) [0032] (LED)
LED11は、 1Wノヽィパワー LEDを採用する。その LED11は縦 2.8mm、横 3.4mm、 高さ 1.15mmの直方体状の外形をなしている。また、第一集光レンズ 20側に向かって 、ほぼ同一の配光角度 (例えば、指向特性（半値全角）標準値 120° 程度）の光束を 発する。設置箇所は、ベース基板 50の上面 51の中央部に配設されている。  LED11 adopts 1W noise power LED. The LED11 has a rectangular parallelepiped shape that is 2.8mm long, 3.4mm wide, and 1.15mm high. Further, light beams having substantially the same light distribution angle (for example, directivity (full width at half maximum) standard value of about 120 °) are emitted toward the first condenser lens 20 side. The installation location is arranged at the center of the upper surface 51 of the base substrate 50.
なお、本実施形態における LED11は、白色 LEDを採用しており、図示しない青色 LEDチップと黄色の蛍光体で白色光を実現可能な LEDとして形成されている。この ため、照射される光は、白色光となっている。  The LED 11 in the present embodiment employs a white LED, and is formed as an LED capable of realizing white light with a blue LED chip (not shown) and a yellow phosphor. For this reason, the irradiated light is white light.
[0033] (レンズホルダー.内スリーブ.外スリーブ） [0033] (Lens holder. Inner sleeve. Outer sleeve)
円筒状に形成されたレンズホルダー 70の内部に、リング状の内スリーブ 80および 外スリーブ 90によって各集光レンズ 20, 40が保持されている。  The condensing lenses 20 and 40 are held by a ring-shaped inner sleeve 80 and an outer sleeve 90 inside a cylindrical lens holder 70.
レンズホルダー 70、内スリーブ 80および外スリーブ 90は、それぞれアルミニウム等 の金属製材質によって形成されている。このため、 LED11によって内部に蓄熱され た熱が、効率よく外部に放熱されるような放熱促進効果が図られる材質となっている [0034] (集光レンズ） The lens holder 70, the inner sleeve 80, and the outer sleeve 90 are each formed of a metal material such as aluminum. For this reason, it is a material that promotes heat dissipation so that the heat stored inside by LED11 can be efficiently dissipated to the outside. [0034] (Condenser lens)
第一集光レンズ 20は、 LED11側の面をフラットとし、反 LED11側の面を凸型に形 成している。この凸型面は、非球面形状であり、 LEDからの光束を有効的に集光す 第二集光レンズ 40は、第一集光レンズ 20側の面も、反第一集光レンズ 20側の面も 凸型に形成している。第一集光レンズ 20側の凸面も、反第一集光レンズ 20側の凸 面も非球面形状であり、 LEDからの光束を有効的に集光する。  The first condenser lens 20 has a flat surface on the LED 11 side and a convex surface on the anti-LED 11 side. This convex surface has an aspherical shape, and effectively condenses the light flux from the LED. The second condenser lens 40 has a surface on the first condenser lens 20 side and an anti-first condenser lens 20 side. The surface is also convex. Both the convex surface on the first condensing lens 20 side and the convex surface on the anti-first condensing lens 20 side are aspherical and effectively collect the light flux from the LED.
このように形成された集光レンズ 20, 40により、第二集光レンズ 40から出射される 光束の出射角度が調節されるので、被照射体に丸い綺麗な照射が実現される。  Since the emission angles of the light beams emitted from the second condenser lens 40 are adjusted by the thus formed condenser lenses 20 and 40, a round and beautiful irradiation is realized on the irradiated object.
[0035] (第二の実施形態） [0035] (Second Embodiment)
続いて、第二の実施形態について説明する。第二の実施形態は、第一の実施形態 と異なり、第一集光レンズ 20Aおよび第二集光レンズ 40Aの製造において光拡散剤 を混入せず、光拡散シート 30を採用している。本実施形態における光拡散シート 30 は、 LED11Aからの入射光束が平行光で入射された場合に、約 60° で拡散して出 射するものを使用している。また、光拡散シートの高さ約 0.25mm、直径 φ 8.4mm、円 周 26.39mm、とした。  Next, the second embodiment will be described. Unlike the first embodiment, the second embodiment employs the light diffusion sheet 30 without mixing a light diffusing agent in the production of the first condenser lens 20A and the second condenser lens 40A. The light diffusion sheet 30 in the present embodiment uses a sheet that diffuses and emits at about 60 ° when an incident light beam from the LED 11A is incident as parallel light. The height of the light diffusion sheet was about 0.25 mm, the diameter was 8.4 mm, and the circumference was 26.39 mm.
LED11Aから前記の光拡散シート 30までの距離は、 0.95mmである。また、光拡散 シート 30上面から内側レンズ 20A底部までの距離は、 0.68mmである。また、第一集 光レンズ 20Aの天頂部から第二集光レンズ 40Aの底部までの距離は、 0.1mmである  The distance from the LED 11A to the light diffusion sheet 30 is 0.95 mm. The distance from the upper surface of the light diffusion sheet 30 to the bottom of the inner lens 20A is 0.68 mm. The distance from the top of the first condenser lens 20A to the bottom of the second condenser lens 40A is 0.1 mm.
[0036] (集光レンズ） [0036] (Condenser lens)
第一集光レンズ 20Aおよび第二集光レンズ 40Aの材質としては、例えば、アクリル 等の透光樹脂や、 COP (シクロォレフィンポリマー）、 COC (シクロォレフィンコポリマ 一）等の透光性を有する耐熱樹脂などを用いることができる。  Examples of the material of the first condenser lens 20A and the second condenser lens 40A include translucent resins such as acrylic, COP (cycloolefin polymer), and COC (cycloolefin copolymer). A heat resistant resin or the like can be used.
第一集光レンズ 20Aおよび第二集光レンズ 40Aの!/、ずれかまたは双方には、所望 される光の色を出すために、着色剤を含有している。いずれのレンズにも光拡散剤を 含有してレ、な!/、ので、着色が自由に行える。 [0037] (効果） Either or both of the first condenser lens 20A and the second condenser lens 40A contain a colorant to produce a desired light color. Each lens contains a light diffusing agent, so it can be colored freely. [0037] (Effect)
本実施形態によれば、被照射体に照射された光のスポットおよびそのエッジが非常 に「くっきり」したスポット光となる。また、拡散シート 30によって均一な配光制御が可 能となるので、色むらおよび照度むらを低減させることになる。  According to the present embodiment, the spot of the light irradiated to the irradiated object and the edge thereof become very “clear” spot light. In addition, since the light distribution can be uniformly controlled by the diffusion sheet 30, uneven color and uneven illumination are reduced.
したがって、各集光レンズ 20A、 40Aから光束が拡散される際に発生する色むら問 題と、その色むら問題を解決した際に生じる機器の大型化問題とを同時に解決する ことができる。このため、携帯電話やデジタルカメラなどの撮影用補助灯としての照明 装置を装着する際でも、小型化に対する要望に応えることができる。  Therefore, it is possible to simultaneously solve the problem of color unevenness that occurs when the light flux is diffused from each of the condensing lenses 20A and 40A and the problem of enlargement of equipment that occurs when the color unevenness problem is solved. For this reason, even when a lighting device as an auxiliary light for photographing such as a mobile phone or a digital camera is mounted, the demand for downsizing can be met.
[0038] なお、上述した各部品サイズおよび各部品間の設置距離は、あくまで一例であり、 上記に限定されることはなレ、。 Note that the above-described component sizes and the installation distances between the components are merely examples, and are not limited to the above.
また、本実施形態における LED11及び LED11Aは、 1Wノヽィパワー LEDを採用 した例を示しているが、これに限定されることはない。例えば、 3W、 5Wまたはそれ以 上としても良く、消費電力が他のワット数になっても応用可能である。  Moreover, although LED11 and LED11A in this embodiment have shown the example which employ | adopted 1W noise power LED, it is not limited to this. For example, it may be 3W, 5W or more, and can be applied even when the power consumption is other wattage.
産業上の利用可能性  Industrial applicability
[0039] 本願発明は、紫外線を含まないので、紫外光を嫌うような被照明品（例えば、博物 館や美術館の展示品）、病院などにおける照明として最適である。また、色むらや照 度むらが極めて少ないので、美術品や商品を綺麗に照らすことにも適している。 また、照明面と非照明面との境目（エッジ）が明確な照明を可能としているので、周 囲への散光が問題となるような読書灯にも適している。 [0039] Since the present invention does not include ultraviolet rays, the present invention is most suitable as illumination in an object that dislikes ultraviolet light (for example, exhibits in museums and museums), hospitals, and the like. In addition, since there is very little unevenness in color and brightness, it is also suitable for illuminating fine arts and products. In addition, since the boundary between the illumination surface and the non-illumination surface (edge) enables clear illumination, it is also suitable for reading lamps where diffuse light to the surroundings becomes a problem.
また、小型軽量であるため、カメラ付きの携帯電話、デジタルカメラなどの撮影用の 補助灯にも用いることができる技術である。  In addition, because of its small size and light weight, it is a technology that can also be used for auxiliary lighting for photography such as mobile phones with cameras and digital cameras.

Claims

請求の範囲 The scope of the claims
[1] LEDから発せられた光束を二枚の集光レンズによって集光させて照射させる照明 装置であって、  [1] An illuminating device that condenses and irradiates a light beam emitted from an LED by two condensing lenses,
電源供給部材を固定したベース基板と、  A base substrate to which a power supply member is fixed;
そのベース基板に実装される LEDと、  LEDs mounted on the base board,
その LEDとは反対側に配置した非球面形状の第一集光レンズと、  An aspherical first condenser lens disposed on the opposite side of the LED;
その第一集光レンズに対して前記 LEDとは反対側に配置した非球面形状の第二 集光レンズとを備え、  An aspherical second condenser lens disposed on the opposite side of the LED with respect to the first condenser lens,
前記の第一集光レンズは、その材質である合成樹脂原料に対して光拡散剤を 0. 0 1乃至 1重量％を含有させたことを特徴とする LED照明装置。  Said 1st condensing lens is a LED illuminating device characterized by including 0.01 to 1 weight% of light diffusing agents with respect to the synthetic resin raw material which is the material.
[2] LEDから発せられた光束を二枚の集光レンズによって集光させて照射させる照明 装置であって、 [2] An illuminating device that irradiates the light beam emitted from the LED by condensing it with two condenser lenses,
電源供給部材を固定したベース基板と、  A base substrate to which a power supply member is fixed;
そのベース基板に実装される LEDと、  LEDs mounted on the base board,
その LEDとは反対側に配置した非球面形状の第一集光レンズと、  An aspherical first condenser lens disposed on the opposite side of the LED;
その第一集光レンズに対して前記 LEDとは反対側に配置した非球面形状の第二 集光レンズとを備え、  An aspherical second condenser lens disposed on the opposite side of the LED with respect to the first condenser lens,
前記の第二集光レンズは、その材質である合成樹脂原料に対して光拡散剤を 0. 0 The second condensing lens has a light diffusing agent of 0.0% with respect to the synthetic resin raw material.
1乃至 1重量％を含有させたことを特徴とする LED照明装置。 LED lighting device characterized by containing 1 to 1% by weight.
[3] 前記第一集光レンズおよび前記第二集光レンズのいずれか一方のうち、光拡散剤 を含有しない集光レンズに着色したことを特徴とする請求項 1または請求項 2のいず れかに記載の LED照明装置。 [3] Either one of the first condenser lens and the second condenser lens, wherein the condenser lens containing no light diffusing agent is colored. The LED lighting device as described above.
[4] 請求項 1、または請求項 2、または請求項 3の LED照明装置を照明装置として用いた 撮像装置。 [4] An imaging device using the LED illumination device according to claim 1, 2 or 3 as an illumination device.
PCT/JP2007/063780 2006-07-31 2007-07-11 Illuminating apparatus and imaging apparatus WO2008015887A1 (en)

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GB2517432A (en) * 2013-08-19 2015-02-25 Jitendra Makvana A light diffuser
WO2017153539A1 (en) * 2016-03-10 2017-09-14 Osram Opto Semiconductors Gmbh Projection optical unit, optoelectronic semiconductor chip, optoelectronic illumination system, camera, terminal

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KR100996912B1 (en) * 2010-02-19 2010-11-29 제디아 주식회사 A lighting for light emittig diode with multi-color
CN103244871B (en) * 2013-04-28 2015-07-01 京东方科技集团股份有限公司 Direct type backlight module and liquid crystal display device

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JP2010239021A (en) * 2009-03-31 2010-10-21 Koha Co Ltd Light source module
US9166127B2 (en) 2009-03-31 2015-10-20 Koha Co., Ltd. Light source module
JP2013140804A (en) * 2011-10-11 2013-07-18 Posco Led Co Ltd Optical semiconductor lighting device
GB2517432A (en) * 2013-08-19 2015-02-25 Jitendra Makvana A light diffuser
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