JP2015176798A - LED bulb - Google Patents

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JP2015176798A
JP2015176798A JP2014053283A JP2014053283A JP2015176798A JP 2015176798 A JP2015176798 A JP 2015176798A JP 2014053283 A JP2014053283 A JP 2014053283A JP 2014053283 A JP2014053283 A JP 2014053283A JP 2015176798 A JP2015176798 A JP 2015176798A
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lens
led
light
globe
light source
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JP6276617B2 (en
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萱沼 安昭
Yasuaki Kayanuma
安昭 萱沼
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シチズンホールディングス株式会社
Citizen Holdings Co Ltd
シチズン電子株式会社
Citizen Electronics Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an LED bulb in which uniformity of luminance on a globe surface is not damaged even when a size of a lens for light distribution enlargement installed inside the globe is increased according to the size increase of an LED light source.SOLUTION: In an LED bulb 20, an annular lens 26 is arranged above an LED light source 25. In the lens 26, a cross section 26a has a substantially triangular portion, and its apex faces downward. Light L1 reflected on an upper surface of the lens 26 heads in a base 24 direction and contributes to the enlargement of light distribution. Light L2 which starts from an end part of the LED light source 25 and travels obliquely upward along a side surface 26b on the outside of the lens 26 makes a shadow of the lens 26 inconspicuous on a surface of a globe 23, and contributes to luminance uniformity of the globe 23 surface.

Description

本発明はグローブ内の空間にLEDとレンズを配し広配光化したLED電球に関する。   The present invention relates to an LED bulb that has an LED and a lens arranged in a space in a globe and has a wide light distribution.
LEDを光源とする電球型の照明装置(以下LED電球と呼ぶ)が普及している。LED電球では、LEDの指向性が強いため、単にLEDをグローブ内に配置しただけでは口金方向に配光分布のない偏った照明装置になってしまう。そこで白熱電球に似た広い配光分布を実現するため様々な手法が提案されている。例えば、LEDを透明基板に実装し、この基板をグローブの中心に配置し、LED裏面から発し透明基板を透過する光線により口金方向に配光分布を持たせたり、グローブ内の空間に多数のLEDを立体的に配置し、様々な方向に配光分布を持たせたり、グローブ内に反射レンズを設け、LEDの発光の一部を口金方向に反射させたりしている。   2. Description of the Related Art A light bulb type lighting device using an LED as a light source (hereinafter referred to as an LED light bulb) has become widespread. In the LED light bulb, the directivity of the LED is strong, so that simply placing the LED in the globe results in a biased illumination device having no light distribution in the base direction. Therefore, various methods have been proposed to realize a wide light distribution similar to incandescent bulbs. For example, an LED is mounted on a transparent substrate, this substrate is placed at the center of the globe, and a light distribution from the back of the LED and transmitted through the transparent substrate has a light distribution in the direction of the base, or a large number of LEDs in the space inside the globe. Are arranged in a three-dimensional manner to give a light distribution in various directions, and a reflection lens is provided in the globe to reflect part of the light emission of the LED in the direction of the base.
グローブ内に反射レンズを設けたLED電球の例として、特許文献1の図6を図5に再掲示し、その構造と作用を説明する。図5はグローブカバー11(グローブ)内の部材の配置を示す模式図である。図5に示す照明装置(電球型LED)では、グローブカバー11内の空間に配光レンズ12(レンズ)、LEDモジュール14(LED光源)、放熱シート部材15、及び保持部材22が配置されている。配光レンズ12は上部に光配光面122と底部に光入射面121を備えている。保持部材22は、突状部31、実装部32及び周縁部33を有し、上側を反射部材13で覆われている。実装部32上には、反射部材13に加え、放熱シート部材15、LEDモジュール14及び配光レンズ12が積層している。   As an example of an LED bulb provided with a reflection lens in the globe, FIG. 6 of Patent Document 1 is shown again in FIG. 5, and its structure and operation will be described. FIG. 5 is a schematic diagram showing the arrangement of members in the globe cover 11 (glove). In the illuminating device (bulb-type LED) shown in FIG. 5, the light distribution lens 12 (lens), the LED module 14 (LED light source), the heat radiation sheet member 15, and the holding member 22 are disposed in the space inside the globe cover 11. . The light distribution lens 12 includes a light distribution surface 122 at the top and a light incident surface 121 at the bottom. The holding member 22 has a protruding portion 31, a mounting portion 32, and a peripheral portion 33, and the upper side is covered with the reflecting member 13. On the mounting portion 32, in addition to the reflecting member 13, the heat radiating sheet member 15, the LED module 14, and the light distribution lens 12 are stacked.
図5において光A(光線)は配光レンズ12を通過し上方に向う。光B、Cは光配光面122で反射し口金方向に向う。このとき光配光面122を透過する光B´、C´も存在する。またグローブカバー11に対して、屈折する光E、透過する光D、反射する光Fがある。さらに反射部材13に対し反射する光G、Hもある。   In FIG. 5, the light A (light beam) passes through the light distribution lens 12 and goes upward. Lights B and C are reflected by the light distribution surface 122 and directed toward the base. At this time, there are also light B ′ and C ′ that pass through the light distribution surface 122. In addition, the globe cover 11 includes light E to be refracted, light D to be transmitted, and light F to be reflected. Furthermore, there are also light G and H reflected to the reflecting member 13.
特開2013−239467号公報 (図6)JP2013-239467A (FIG. 6)
特許文献1の段落0087の記載によれば、発光点(光配光面122等)がグローブカバー11に近づくとグローブカバー11に縞状の模様が映し出され非常に目障りなものとなるため、図5に示したLED電球(照明装置)では配光レンズ12とグローブカバー11とが必要以上に近づかないようにしている。しかしながらLED電球を明るくするためLED光源が大きくなれば配光分布を広げるためのレンズも大型化せざるを得ない。このとき特許文献1に示されたようなレンズ(配光レンズ12)ではグローブ表面の輝度分布が不均一になり縞状の模様が目立ってしまう。   According to the description in paragraph 0087 of Patent Document 1, when a light emitting point (light distribution surface 122 or the like) approaches the globe cover 11, a striped pattern is projected on the globe cover 11 and becomes very annoying. In the LED light bulb (illumination device) shown in FIG. 5, the light distribution lens 12 and the globe cover 11 are kept away from each other more than necessary. However, if the LED light source becomes larger in order to brighten the LED bulb, the lens for widening the light distribution must be enlarged. At this time, in the lens (light distribution lens 12) as shown in Patent Document 1, the luminance distribution on the surface of the globe is non-uniform, and the striped pattern becomes conspicuous.
そこで本発明は、上記課題に鑑みて為されたものであり、LED光源の大型化にともないグローブ内に設置した配光分布拡大用のレンズが大型化してもグローブ表面の輝度の均一性が損なわれないLED電球を提供することを目的とする。   Therefore, the present invention has been made in view of the above problems, and even if the lens for expanding the light distribution distribution installed in the globe is increased with the increase in the size of the LED light source, the luminance uniformity on the surface of the globe is impaired. The object is to provide an LED bulb that does not.
上記目的を達成するため本発明のLED電球は、上部にグローブと、下部に口金を固定保持する筐体とを備え、前記グローブ内の空間にLED光源とレンズが配置されたLED電球において、
前記レンズが円環状であって、その断面が下を向いた三角形状の部分を有し、
前記LED光源と前記レンズとが中心軸を共有し、前記LED光源の上部に前記レンズが配置され、
前記レンズの外側の側面を前記口金方向に延長したとき、その延長部が前記LED光源の発光領域と交差する
ことを特徴とする。
In order to achieve the above object, an LED bulb of the present invention comprises a globe at the top and a housing for fixing and holding the base at the bottom, and an LED bulb in which an LED light source and a lens are arranged in the space in the globe.
The lens has an annular shape, and has a triangular portion whose cross section faces downward;
The LED light source and the lens share a central axis, and the lens is disposed on the LED light source,
When the outer side surface of the lens is extended in the base direction, the extended portion intersects the light emitting region of the LED light source.
本発明のLED電球では、LED光源の上部に、中央部が開口した円環状のレンズが配置されている。このレンズは断面が略三角形でその頂点が下を向いている。LED光源を発しレンズ上面で反射した光線は口金方向に向う。レンズ上面を透過した光線及びレンズの開口を通った光線は斜め上方から上方にかけて進行する。LED光源の端部を発しレンズの下方を進行する光線の一部は、レンズの外側の側面に沿って進み、グローブの影を目立たなくする。   In the LED light bulb of the present invention, an annular lens having an opening at the center is disposed above the LED light source. This lens has a substantially triangular cross section and its apex faces downward. A light beam emitted from the LED light source and reflected from the upper surface of the lens is directed toward the base. The light beam that has passed through the upper surface of the lens and the light beam that has passed through the opening of the lens travel from diagonally upward to upward. Some of the light rays originating from the end of the LED light source and traveling below the lens travel along the outer side of the lens, making the shadow of the globe inconspicuous.
前記LED光源の発光領域が円形であると良い。   The light emitting area of the LED light source is preferably circular.
前記レンズの開口は上部が前記LED光源の発光領域より小さく、下部が前記発光領域より大きくても良い。   The upper portion of the lens opening may be smaller than the light emitting region of the LED light source and the lower portion may be larger than the light emitting region.
前記グローブは拡散性を有していると良い。     The globe preferably has diffusibility.
以上のように本発明のLED電球は、レンズにより配光分布を広げようとするとき、レンズの外側の側面に沿って斜め上方に進みグローブの影を目立たなくする光線が存在するため、LED光源の大型化にともないグローブ内に設置した配光分布拡大用のレンズが大型化しても、グローブ表面の輝度の均一性が損なわれない。   As described above, the LED light bulb according to the present invention has a light beam that goes obliquely upward along the outer side surface of the lens and makes the shadow of the globe inconspicuous when trying to broaden the light distribution by the lens. Even if the lens for expanding the light distribution installed in the globe is increased with the increase in size, the brightness uniformity on the surface of the globe is not impaired.
本発明の実施形態として示すLED電球の説明図である。It is explanatory drawing of the LED bulb shown as embodiment of this invention. 図1に示すLED電球の要部断面図である。It is principal part sectional drawing of the LED bulb shown in FIG. 図1に示すLED電球の要部断面図である。It is principal part sectional drawing of the LED bulb shown in FIG. 図1に示すLED光源とレンズ側面との関係の説明図である。It is explanatory drawing of the relationship between the LED light source shown in FIG. 1, and a lens side surface. 従来のLED電球におけるグローブ内の部材配置を示す模式図である。It is a schematic diagram which shows the member arrangement | positioning in the globe in the conventional LED bulb.
以下、添付図1〜4を参照しながら本発明の好適な実施形態について詳細に説明する。なお図面の説明において、同一または相当要素には同一の符号を付し、重複する説明は省略する。また説明のため部材の縮尺は適宜変更している。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted. For the sake of explanation, the scale of the members is changed as appropriate.
まず図1により本発明の実施形態として示すLED電球20の外観について説明する。図1(a)はLED電球20の正面図であり、図1(b)は中心軸を含むようにLED電球20に含まれるレンズを切断し、斜め上方から眺めた斜視図である。   First, the external appearance of the LED bulb 20 shown as an embodiment of the present invention will be described with reference to FIG. FIG. 1A is a front view of the LED bulb 20, and FIG. 1B is a perspective view of the lens included in the LED bulb 20 cut so as to include the central axis and viewed obliquely from above.
図1(a)に示したようにLED電球20の筐体21は、上部にグローブ23が固定保持され、下部に口金24が固定保持されている。グローブ23の内側に設けられた空間には、LED光源25とレンズ26とが配置されている。レンズ26は下部に支持部26dがあり、支持部26dが透明であるため支持部26dにとり囲まれたLED光源25も観
察される。なお図1(a)ではLED電球20を簡略化して描いているので、実際にはLED光源25の発光領域25aが支持部26dに囲まれている(図2参照)。またグローブ23の内部が透視できるように透明であるように描いているが、LED光源25の発光が直接的に感知されないようにするにはグローブ23が拡散性を有していると良い。
As shown in FIG. 1A, the housing 21 of the LED bulb 20 has a globe 23 fixedly held at the upper part and a base 24 fixedly held at the lower part. An LED light source 25 and a lens 26 are arranged in a space provided inside the globe 23. The lens 26 has a support portion 26d at the bottom, and since the support portion 26d is transparent, the LED light source 25 surrounded by the support portion 26d is also observed. In FIG. 1 (a), the LED bulb 20 is illustrated in a simplified manner, so that the light emitting region 25a of the LED light source 25 is actually surrounded by the support portion 26d (see FIG. 2). The globe 23 is drawn so as to be transparent so that the inside of the globe 23 can be seen through, but the globe 23 is preferably diffusible so that the light emission of the LED light source 25 is not directly detected.
図1(b)に示すようにレンズ26は円環状であり、その断面には頂点が下側を向いた略三角形をした部分があり、その下側の頂点付近に円筒状の支持部26dが接続している。レンズ26の上面は平面であり、外側の側面26bと内側の側面26cがある。   As shown in FIG. 1B, the lens 26 has an annular shape, and its cross section has a substantially triangular portion with its apex facing downward, and a cylindrical support portion 26d is located near the lower apex. Connected. The upper surface of the lens 26 is a flat surface, and has an outer side surface 26b and an inner side surface 26c.
LED光源25は配光分布が軸対象になるよう円形の発光領域25a(図2参照)を有する。LED光源25は、表面を絶縁処理した金属や白色のセラミックからなる矩形の実装基板25b(図2参照)上に円形のダム材を形成し、その内部に多数のLEDダイを配置し、蛍光樹脂でLEDダイを被覆したものであり、筐体21の上面に配置される。なおLED電球の発光領域は円形以外に正方形や正多角形など対称性の高いものであっても良いが、LED電球20のように発光領域25aが円形である場合がもっとも好ましい。   The LED light source 25 has a circular light emitting region 25a (see FIG. 2) so that the light distribution is an axis target. The LED light source 25 is formed by forming a circular dam material on a rectangular mounting substrate 25b (see FIG. 2) made of a metal or white ceramic whose surface is insulated, and a plurality of LED dies are disposed therein, and a fluorescent resin The LED die is covered with and disposed on the upper surface of the housing 21. The light emitting region of the LED bulb may be a highly symmetric one such as a square or a regular polygon other than a circle, but the case where the light emitting region 25a is circular like the LED bulb 20 is most preferable.
レンズ26は、透明な樹脂からなり、前述のように中央部が開口した円環である。断面が三角形となる部分がレンズ26の主要部であり、この主要部はLED光源25の上部に所定の間隔をあけて配置されている。またレンズ26とLED光源25は中心軸を共通にしている。なお レンズ26の支持部26dは中空の円筒形であるが、複数の柱状体からなるものであっても良い。   The lens 26 is made of a transparent resin and is a ring with an opening at the center as described above. A portion having a triangular cross section is a main portion of the lens 26, and this main portion is disposed above the LED light source 25 at a predetermined interval. The lens 26 and the LED light source 25 have a common central axis. The support portion 26d of the lens 26 has a hollow cylindrical shape, but may be composed of a plurality of columnar bodies.
次に図2によりLED電球20の構造をさらに詳しく説明する。図2は図1に示したLED電球20の要部について光軸(中心軸)を含むようにして描いた断面図である。なお支持部26d(図1参照)は図示していない。前述のようにLED光源25では実装基板25b上に発光領域25aが形成されており、LED光源25は筐体21上に配置されている。レンズ26の断面26aは上部が水平な不等辺三角形であり、図中の内側の側面26cが外側の側面26bより短い。   Next, the structure of the LED bulb 20 will be described in more detail with reference to FIG. FIG. 2 is a cross-sectional view illustrating the main part of the LED bulb 20 shown in FIG. 1 so as to include the optical axis (center axis). The support portion 26d (see FIG. 1) is not shown. As described above, in the LED light source 25, the light emitting region 25a is formed on the mounting substrate 25b, and the LED light source 25 is disposed on the housing 21. The cross-section 26a of the lens 26 is an unequal triangular shape with a horizontal top, and the inner side surface 26c in the figure is shorter than the outer side surface 26b.
図2に示すようにLED電球20において、レンズ26の開口は上部が実装基板25b上に設けられたLED光源25の発光領域25aよりも小さく、下部が発光領域25aよりも大きい。発光領域25aがレンズ26の開口より大きくても小さくても本発明の効果は得られるが、開口の上部が発光領域25aより大きいとレンズ26に入射する光線が減るため配光分布の均一性が低下し、開口の下部が発光領域25aより小さい場合は発光領域25aの周辺部の発光のうち上方に向おうとする光線がレンズ26の外側の側面26bに当たるためグローブ23の頂部方向の輝度向上に寄与しにくくなる。これに対しLED電球20のようにレンズ26の開口の上部がLED光源25の発光領域25aより小さく、下部が発光領域25aより大きければ、配光分布が良好な状態でグローブ23の頂部方向を明るくできる。   As shown in FIG. 2, in the LED bulb 20, the opening of the lens 26 is smaller at the upper part than the light emitting area 25a of the LED light source 25 provided on the mounting substrate 25b, and the lower part is larger than the light emitting area 25a. The effect of the present invention can be obtained regardless of whether the light emitting area 25a is larger or smaller than the opening of the lens 26. However, if the upper part of the opening is larger than the light emitting area 25a, the amount of light incident on the lens 26 is reduced, and the uniformity of the light distribution is obtained. If the lower portion of the opening is smaller than the light emitting region 25a, the light beam going upward from the light emitted from the periphery of the light emitting region 25a hits the side surface 26b on the outer side of the lens 26, which contributes to the luminance improvement in the top direction of the globe 23. It becomes difficult to do. On the other hand, if the upper part of the opening of the lens 26 is smaller than the light emitting area 25a of the LED light source 25 and the lower part is larger than the light emitting area 25a as in the LED bulb 20, the top direction of the globe 23 is brightened with a good light distribution. it can.
次に図3によりLED電球20の発光特性をさらに詳しく説明する。図3は図2に示したLED電球20の断面図に代表的な光線を書き加えたものである。図3に示すように光線L1は、LED光源25の周辺部から斜め上方に発し、レンズ26の内側の側面26cからレンズ26に入射し、レンズ26の上面で反射し、外側の側面26bから出射し、口金24(図1参照)方向に向う。光線L2は、レンズ26の外側の斜面に沿って斜め上方に向う。光線L3はレンズ26の内側の側面26cからレンズ26に入射し、レンズ26の上面から出射し斜め上方に向う。光線L4及び光線L5はレンズ26の開口を抜け、斜め上方及び上方に向う。   Next, the light emission characteristics of the LED bulb 20 will be described in more detail with reference to FIG. FIG. 3 is a cross-sectional view of the LED bulb 20 shown in FIG. As shown in FIG. 3, the light beam L1 is emitted obliquely upward from the periphery of the LED light source 25, is incident on the lens 26 from the inner side surface 26c of the lens 26, is reflected on the upper surface of the lens 26, and is emitted from the outer side surface 26b. And toward the base 24 (see FIG. 1). The light beam L2 is directed obliquely upward along the outer slope of the lens 26. The light ray L3 is incident on the lens 26 from the inner side surface 26c of the lens 26, is emitted from the upper surface of the lens 26, and is directed obliquely upward. The light beam L4 and the light beam L5 pass through the opening of the lens 26 and are directed obliquely upward and upward.
以上のようにレンズ26により進路を変えられた光線L1、L3等でLED電球20は
広い配光分布を獲得できる。このときレンズ26の外側の側面26bに沿って進む光線L2により、グローブ23上でレンズ26の影が発生しやすい方向にも配光成分が振り分けられるため、レンズ26の影が目立たなくなり、グローブ23の表面輝度の均一性が向上する。また光線L2は、レンズ26の外側の側面26bと略平行なので、レンズ26のサイズの影響を受けにく、LED光源25の発光領域25a及びレンズ26が大型化してもレンズ26の影が目立ちにくい状態を維持できる。
As described above, the LED bulb 20 can acquire a wide light distribution by the light beams L1, L3, and the like whose course has been changed by the lens 26. At this time, the light distribution component is also distributed in the direction in which the shadow of the lens 26 is likely to be generated on the globe 23 by the light ray L2 traveling along the outer side surface 26b of the lens 26, so that the shadow of the lens 26 becomes inconspicuous. The uniformity of the surface brightness is improved. Further, since the light ray L2 is substantially parallel to the outer side surface 26b of the lens 26, it is not easily affected by the size of the lens 26, and even if the light emitting area 25a of the LED light source 25 and the lens 26 are enlarged, the shadow of the lens 26 is not noticeable. The state can be maintained.
次に図4によりレンズ26の外側の側面26bの角度設定について説明する。図4(a)は側面26bとLED光源25(図2参照)の発光領域25aの関係を説明するための斜視図であり、図4(b)は側面26bと発光領域25aの関係を説明するための断面図である。   Next, the angle setting of the outer side surface 26b of the lens 26 will be described with reference to FIG. 4A is a perspective view for explaining the relationship between the side surface 26b and the light emitting region 25a of the LED light source 25 (see FIG. 2), and FIG. 4B illustrates the relationship between the side surface 26b and the light emitting region 25a. FIG.
図4(a)に示すように側面26bはコーン状になり、側面26bを口金24(図1参照)方向に延長すると、その延長部26eがLED光源25(図2参照)の発光領域25aと交差している。このようにすると図4(b)に示すように、延長部26eと発光領域25aの交差部から出射する光線L2は、側面26bの下面に沿って進みLED電球20(図2等参照)の斜め上方に向う。   As shown in FIG. 4A, the side surface 26b has a cone shape, and when the side surface 26b is extended in the direction of the base 24 (see FIG. 1), the extended portion 26e becomes the light emitting region 25a of the LED light source 25 (see FIG. 2). Crossed. If it does in this way, as shown in FIG.4 (b), the light ray L2 radiate | emitted from the cross | intersection part of the extension part 26e and the light emission area | region 25a will advance along the lower surface of the side surface 26b, and the diagonal of LED bulb 20 (refer FIG. 2 etc.). Head up.
なお本実施形態は電球型の照明装置であったが、LED光源やレンズ等を直線状(又は帯状)にし図2等の断面が同等となるようにすれば、直管型蛍光灯のような管状光源でも、天井方向に配光分布を有しながら、カバーに対してレンズの影を目立たなくさせることができる。   Although the present embodiment is a light bulb type lighting device, if the LED light source, the lens, etc. are linear (or belt-shaped) and the cross-sections of FIG. Even with a tubular light source, the shadow of the lens can be made inconspicuous with respect to the cover while having a light distribution in the ceiling direction.
20…LED電球、
21…筐体、
23…グローブ、
24…口金、
25…LED光源、
25a…発光領域、
25b…実装基板、
26…レンズ
26a…断面、
26b、26c…側面、
26d…支持部、
26e…延長部、
L1〜5…光線。
20 ... LED bulb,
21 ... Case,
23 ... Glove,
24 ...
25 ... LED light source,
25a ... light emitting area,
25b ... mounting board,
26 ... Lens 26a ... Cross section,
26b, 26c ... side face,
26d ... support part,
26e ... extension,
L1-5. Light rays.

Claims (4)

  1. 上部にグローブと、下部に口金を固定保持する筐体とを備え、前記グローブ内の空間にLED光源とレンズが配置されたLED電球において、
    前記レンズが円環状であって、その断面が下を向いた三角形状の部分を有し、
    前記LED光源と前記レンズとが中心軸を共有し、前記LED光源の上部に前記レンズが配置され、
    前記レンズの外側の側面を前記口金方向に延長したとき、その延長部が前記LED光源の発光領域と交差する
    ことを特徴とするLED電球。
    In an LED bulb comprising a globe at the top and a housing for fixing and holding the base at the bottom, and an LED light source and a lens arranged in the space inside the globe,
    The lens has an annular shape, and has a triangular portion whose cross section faces downward;
    The LED light source and the lens share a central axis, and the lens is disposed on the LED light source,
    An LED bulb characterized in that when the outer side surface of the lens is extended in the direction of the base, the extended portion intersects the light emitting region of the LED light source.
  2. 前記LED光源の発光領域が円形であることを特徴とする請求項1に記載のLED電球。   The LED bulb according to claim 1, wherein a light emitting region of the LED light source is circular.
  3. 前記レンズの開口は上部が前記LED光源の発光領域より小さく、下部が前記発光領域より大きいことを特徴とする請求項1又は2に記載のLED電球。   The LED bulb according to claim 1 or 2, wherein the opening of the lens has an upper portion smaller than a light emitting region of the LED light source and a lower portion larger than the light emitting region.
  4. 前記グローブは拡散性を有していることを特徴とする請求項1から3のいずれか一項に記載のLED電球。   The LED bulb according to any one of claims 1 to 3, wherein the globe has diffusibility.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010157459A (en) * 2008-12-31 2010-07-15 Keiji Iimura Led lamp, and bulb-type led lamp
US20120081894A1 (en) * 2010-09-30 2012-04-05 Altair Engineering, Inc. Incandescent led replacement lamp
JP2014002949A (en) * 2012-06-19 2014-01-09 Toshiba Corp Luminaire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010157459A (en) * 2008-12-31 2010-07-15 Keiji Iimura Led lamp, and bulb-type led lamp
US20120081894A1 (en) * 2010-09-30 2012-04-05 Altair Engineering, Inc. Incandescent led replacement lamp
JP2014002949A (en) * 2012-06-19 2014-01-09 Toshiba Corp Luminaire

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