JP5505096B2 - Light source device - Google Patents

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JP5505096B2
JP5505096B2 JP2010126493A JP2010126493A JP5505096B2 JP 5505096 B2 JP5505096 B2 JP 5505096B2 JP 2010126493 A JP2010126493 A JP 2010126493A JP 2010126493 A JP2010126493 A JP 2010126493A JP 5505096 B2 JP5505096 B2 JP 5505096B2
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正樹 井上
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Ushio Denki KK
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Description

本発明は、ファクシミリ、複写機、スキャナなどの機器に使用される原稿読取用の光源装置に関する。   The present invention relates to a light source device for reading a document used in devices such as a facsimile, a copying machine, and a scanner.

ファクシミリ、複写機、スキャナなどの機器は、原稿面からの反射光によって原稿面の文字・画像情報を読み取る原稿読取装置を有し、この原稿読取装置には、原稿面を照明する光源装置が搭載されている。
このような光源装置としては、棒状の導光体の一端面に、発光ダイオードが配置されてなるものが知られている（特許文献１参照。）。 Equipment such as facsimiles, copiers, and scanners have a document reading device that reads text and image information on the document surface by reflected light from the document surface, and this document reading device is equipped with a light source device that illuminates the document surface. Has been.
As such a light source device, one in which a light emitting diode is arranged on one end face of a rod-shaped light guide is known (see Patent Document 1).

図７は、従来の光源装置の一例における要部の構成を示す説明用断面図である。この光源装置は、例えばアクリル樹脂などの透光性樹脂よりなる棒状の導光体７０を有し、この導光体７０には、その長手方向に垂直な断面における外周輪郭が円弧状の光出射面７１が、当該導光体７０の長手方向に沿って形成され、この光出射面７１に対向する周面には、微小プリズム群７２が形成されている。
導光体７０の一端には、発光ダイオード８５が当該導光体７０の一端面７５に対向するよう配置されている。具体的には、表面に配線（図示省略）が形成された給電配線板８０が、導光体７０の一端面７５に対向するよう配置され、この給電配線板８０の表面上に、静電気保護用のダイオード素子８１を介して発光ダイオード８５が配置されている。ダイオード素子８１は、導電性接着材８２およびワイヤー配線８３によって給電配線板８０に電気的に接続され、一方、発光ダイオード８５は、マイクロバンプ８６によってダイオード素子８１に電気的に接続されている。そして、ダイオード素子８１および発光ダイオード８５の全体を覆うよう、透光性樹脂よりなる半球状の封止体８７が設けられている。
また、給電配線板８０の表面上には、給電配線板８０から導光体７０に向かうに従って拡径する光反射面９１を内周面に有する筒状の光反射部材９０が、当該光反射面９１が発光ダイオード８５と導光体７０との間の光路を包囲するよう配置されている。この光反射部材９０は、給電配線板８０の表面に形成された配線に接触しても配線間に短絡が生じないよう、白色に着色された電気的絶縁性を有する樹脂材料によって構成されている。 FIG. 7 is an explanatory cross-sectional view showing a configuration of a main part in an example of a conventional light source device. This light source device has a rod-shaped light guide 70 made of a translucent resin such as acrylic resin, and the light guide 70 emits light whose outer peripheral contour in a cross section perpendicular to the longitudinal direction is an arc. A surface 71 is formed along the longitudinal direction of the light guide 70, and a small prism group 72 is formed on the peripheral surface facing the light emitting surface 71.
A light emitting diode 85 is disposed at one end of the light guide 70 so as to face the one end surface 75 of the light guide 70. Specifically, a power supply wiring board 80 having a wiring (not shown) formed on the surface thereof is disposed so as to face one end surface 75 of the light guide 70, and the electrostatic protection is provided on the surface of the power supply wiring board 80. A light emitting diode 85 is arranged through the diode element 81. The diode element 81 is electrically connected to the power supply wiring board 80 by the conductive adhesive 82 and the wire wiring 83, while the light emitting diode 85 is electrically connected to the diode element 81 by the micro bump 86. A hemispherical sealing body 87 made of a translucent resin is provided so as to cover the entire diode element 81 and the light emitting diode 85.
Further, on the surface of the power supply wiring board 80, a cylindrical light reflection member 90 having a light reflection surface 91 whose diameter increases from the power supply wiring board 80 toward the light guide 70 on the inner peripheral surface is the light reflection surface. 91 is arranged so as to surround the optical path between the light emitting diode 85 and the light guide 70. The light reflecting member 90 is made of a resin material having electrical insulation that is colored in white so that a short circuit does not occur between the wirings even if the light reflecting member 90 contacts the wirings formed on the surface of the power supply wiring board 80. .

このような光源装置においては、発光ダイオード８５から放射された光が、発光ダイオード８５と導光体７０との間の光路を介して直接または光反射部材９０の光反射面９１に反射されながら、導光体７０の一端面７５から当該導光体７０内に入射され、この入射光は、導光体７０によってその周面に反射されながら当該導光体７０の長手方向に導かれると共に、微小プリズム群７２によって光出射面７１に向かって反射され、この反射光が導光体７０の光出射面７１から出射され、例えば原稿台上に載置された原稿の原稿面に照射される。   In such a light source device, the light emitted from the light emitting diode 85 is reflected directly or through the light reflecting surface 91 of the light reflecting member 90 via the optical path between the light emitting diode 85 and the light guide 70. The light enters the light guide 70 from one end surface 75 of the light guide 70, and the incident light is guided in the longitudinal direction of the light guide 70 while being reflected by the light guide 70 on the peripheral surface thereof. The reflected light is reflected by the prism group 72 toward the light emitting surface 71, and the reflected light is emitted from the light emitting surface 71 of the light guide 70, and is applied to, for example, the document surface of the document placed on the document table.

而して、原稿読取装置に搭載される光源装置としては、原稿面においてより高い照度が得られることが求められており、このような光源装置の高照度化を達成するためには、導光体の一端面に入射される光の光量を増加させること、具体的には、出力の高い発光ダイオードを用いること、或いは複数の発光ダイオードを用いることなどが必要である。   Thus, a light source device mounted on a document reading device is required to have higher illuminance on the document surface. In order to achieve such a light source device with higher illuminance, a light guide device is required. It is necessary to increase the amount of light incident on one end surface of the body, specifically, to use a light-emitting diode with high output or to use a plurality of light-emitting diodes.

特開平１１−８４１３７号公報Japanese Patent Laid-Open No. 11-84137

しかしながら、上記の光源装置においては、導光体７０の一端面に入射される光の光量を増加させた場合には、発光ダイオード８５と導光体７０との光路を包囲する光反射部材９０を構成する樹脂は放熱性が低いものであるため、導光体７０の一端部が相当に高い温度に加熱される結果、当該導光体７０の一端部に熱変形が生じるおそれがある、という問題がある。
また、光反射部材９０を放熱性の高い金属により構成する場合には、給電配線板８０の表面に形成された配線間に短絡が生じるおそれがある。 However, in the above light source device, when the amount of light incident on one end surface of the light guide 70 is increased, the light reflecting member 90 that surrounds the optical path between the light emitting diode 85 and the light guide 70 is provided. Since the constituent resin has a low heat dissipation property, one end portion of the light guide body 70 is heated to a considerably high temperature, and as a result, the one end portion of the light guide body 70 may be thermally deformed. There is.
Further, when the light reflecting member 90 is made of a metal having high heat dissipation, there is a possibility that a short circuit may occur between the wirings formed on the surface of the power supply wiring board 80.

本発明は、以上のような事情に基づいてなされたものであって、その目的は、導光体の一端面に入射される光の光量を増加させた場合にも、当該導光体の一端部が高い温度に加熱されることを抑制することができ、しかも、光反射部材を介して給電配線板の表面に形成された配線間に短絡が生じることがない光源装置を提供することにある。   The present invention has been made based on the circumstances as described above, and the object thereof is one end of the light guide even when the amount of light incident on one end surface of the light guide is increased. An object of the present invention is to provide a light source device that can suppress the heating of the part to a high temperature and that does not cause a short circuit between the wirings formed on the surface of the power supply wiring board via the light reflecting member. .

本発明の光源装置は、棒状の導光体と、
回路基板、この回路基板の表面上に配置された発光ダイオードおよびこの発光ダイオードを覆うよう設けられた透光性の封止体よりなり、前記導光体の一端面に対向するよう配置されたＬＥＤ実装体と、
このＬＥＤ実装体における回路基板の裏面に配置され、当該ＬＥＤ実装体に電気的に接続された、表面に配線を有する給電配線板と、
この給電配線板に接近して位置する基端から先端に向かうに従って拡径する光反射面が内周面に形成された筒状の光反射面形成部、およびこの光反射面形成部の先端に連続して一体に形成された、導光体の長手方向に伸びる筒状の導光体受容部を有し、当該導光体受容部に導光体の一端部が挿入され、前記光反射面が前記ＬＥＤ実装体と前記導光体との間の光路を包囲するよう配置された金属製の光反射部材とを具えてなり、
前記光反射部材は、それぞれ前記光反射面形成部の基端面から前記給電配線板に向かって突出して当該給電配線板の表面における非配線領域に対接する複数の突出脚部を有し、当該光反射面形成部の基端面が前記回路基板の表面から離隔するよう配置されていることを特徴とする。 The light source device of the present invention includes a rod-shaped light guide,
An LED which is composed of a circuit board, a light emitting diode disposed on the surface of the circuit board, and a light-transmitting sealing body provided so as to cover the light emitting diode, and is disposed so as to face one end surface of the light guide body An implementation,
A power supply wiring board disposed on the back surface of the circuit board in this LED mounting body and electrically connected to the LED mounting body, and having wiring on the surface,
A cylindrical light reflecting surface forming portion having an inner peripheral surface formed with a light reflecting surface whose diameter increases toward the tip from the proximal end positioned close to the power supply wiring board , and the tip of the light reflecting surface forming portion. A cylindrical light guide receiving portion that extends continuously in the longitudinal direction of the light guide, and one end of the light guide is inserted into the light guide receiving portion, and the light reflecting surface Comprising a metal light reflecting member arranged so as to surround an optical path between the LED mounting body and the light guide body,
The light reflecting member has a plurality of projecting leg portions that project from the base end face of the light reflecting surface forming portion toward the power supply wiring board and come into contact with non-wiring regions on the surface of the power supply wiring board. The base end surface of the reflection surface forming portion is disposed so as to be separated from the surface of the circuit board.

本発明の光源装置においては、前記給電配線板の表面と前記光反射面形成部の基端面との間の間隙に向かう光を遮蔽する遮光体が設けられていることが好ましい。
また、前記回路基板と前記光反射面形成部との間には、前記封止体の周囲を取り囲み、当該回路基板に接近して位置する裏面から当該光反射面形成部に接近して位置する表面に向かうに従って拡径する光反射面を有する電気絶縁性材料よりなる絶縁性光反射部材が設けられていることが好ましい。
また、前記給電配線板は、金属板上に絶縁層を介して配線が形成されてなるものであることが好ましい。 In the light source device of the present invention, it is preferable that a light-shielding body that shields light traveling toward a gap between the surface of the power supply wiring board and the base end surface of the light reflecting surface forming portion is provided.
Further, between the circuit board and the light reflecting surface forming portion, the periphery of the sealing body is surrounded, and the back surface located close to the circuit substrate is located close to the light reflecting surface forming portion. It is preferable that an insulating light reflecting member made of an electrically insulating material having a light reflecting surface whose diameter increases toward the surface is provided.
Moreover, it is preferable that the said electric power feeding wiring board is formed by wiring on a metal plate through an insulating layer.

本発明の光源装置によれば、光反射部材が放熱性の高い金属により構成されているため、導光体の一端面に入射される光の光量を増加させた場合にも、導光体の一端部が高い温度に加熱されることが抑制されるので、当該導光体の一端部に熱変形が生じることを防止することができる。しかも、光反射部材は、その光反射面形成部の基端面から給電配線板に向かって突出して当該給電配線板の表面における非配線領域に対接する複数の突出脚部を有し、これにより、光反射面形成部の基端面が回路基板の表面から離隔した状態とされているため、光反射部材を介して給電配線板の表面に形成された配線間およびＬＥＤ実装体における回路基板の表面に形成された配線間に短絡が生じることがない。
また、給電配線板の表面と光反射部材における光反射面形成部の基端面との間の間隙に向かう光を遮蔽する遮光体が設けられた構成によれば、光反射面形成部と給電配線板の表面との間から光が放出されることによる迷光の発生を防止することができる。
また、ＬＥＤ実装体における回路基板と光反射部材における光反射面形成部との間に、当該ＬＥＤ実装体における封止体の周囲を取り囲み、当該回路基板に接近して位置する裏面から当該光反射面形成部に接近して位置する表面に向かうに従って拡径する光反射面を有する絶縁性光反射部材が設けられた構成によれば、給電配線板の表面と光反射部材における光反射面形成部の基端面との間の間隙に向かう光が絶縁性光反射部材によって反射されて導光体の一端面に入射されるので、高い光の利用率が得られる。 According to the light source device of the present invention, since the light reflecting member is made of a metal with high heat dissipation, even when the amount of light incident on one end surface of the light guide is increased, Since it is suppressed that one end part is heated to high temperature, it can prevent that a heat deformation arises in the one end part of the said light guide. Moreover, the light reflecting member has a plurality of projecting leg portions that protrude from the base end surface of the light reflecting surface forming portion toward the power supply wiring board and come into contact with the non-wiring region on the surface of the power supply wiring board. Since the base end face of the light reflecting surface forming part is separated from the surface of the circuit board, between the wires formed on the surface of the power supply wiring board via the light reflecting member and on the surface of the circuit board in the LED mounting body There is no short circuit between the formed wires.
In addition, according to the configuration in which the light shielding body that shields the light toward the gap between the surface of the power supply wiring board and the base end surface of the light reflection surface forming portion in the light reflecting member is provided, the light reflection surface forming portion and the power supply wiring are provided. Generation of stray light due to light being emitted from between the surfaces of the plates can be prevented.
Further, between the circuit board in the LED mounting body and the light reflecting surface forming portion in the light reflecting member, the light reflecting surface is surrounded from the sealing body in the LED mounting body and is located close to the circuit board. According to the configuration in which the insulating light reflecting member having the light reflecting surface whose diameter is increased toward the surface located close to the surface forming portion, the surface of the power supply wiring board and the light reflecting surface forming portion in the light reflecting member are provided. Since the light which goes to the gap between the base end face is reflected by the insulating light reflecting member and is incident on the one end face of the light guide, a high light utilization rate can be obtained.

本発明の第１の実施の形態に係る光源装置における要部の構成を示す説明用断面図である。It is sectional drawing for description which shows the structure of the principal part in the light source device which concerns on the 1st Embodiment of this invention. 図１に示す光源装置における光反射部材を示す説明図であり、（ａ）は平面図、（ｂ）は側面図である。It is explanatory drawing which shows the light reflection member in the light source device shown in FIG. 1, (a) is a top view, (b) is a side view. 本発明の第２の実施の形態に係る光源装置における要部の構成を示す説明用断面図である。It is sectional drawing for description which shows the structure of the principal part in the light source device which concerns on the 2nd Embodiment of this invention. 本発明の第３の実施の形態に係る光源装置における要部の構成を示す説明用断面図である。It is sectional drawing for description which shows the structure of the principal part in the light source device which concerns on the 3rd Embodiment of this invention. 図４に示す光源装置の一部を拡大して示す説明用断面図である。It is sectional drawing for description which expands and shows a part of light source device shown in FIG. 光反射部材における突出脚部の変形例を示す説明図である。It is explanatory drawing which shows the modification of the protrusion leg part in a light reflection member. 従来の光源装置の一例における要部の構成を示す説明用断面図である。It is sectional drawing for description which shows the structure of the principal part in an example of the conventional light source device.

以下、本発明の光源装置の実施の形態について説明する。
図１は、本発明の第１の実施の形態に係る光源装置における要部の構成を示す説明用断面図である。この光源装置は、例えばアクリル樹脂などの透光性樹脂よりなる棒状の導光体１０を有する。この導光体１０には、その長手方向に垂直な断面における外周輪郭が円弧状の光出射面１１が、当該導光体１０の長手方向に沿って形成され、この光出射面１１に対向する周面には、微小プリズム群１２が形成されている。
また、導光体１０は、当該導光体１０の長手方向に沿って伸びる、例えばアルミニウムなどの剛性を有する金属よりなる基台３０に、直接または適宜の支持体を介して支持されている。 Hereinafter, embodiments of the light source device of the present invention will be described.
FIG. 1 is an explanatory cross-sectional view showing a configuration of a main part of the light source device according to the first embodiment of the present invention. The light source device has a rod-shaped light guide 10 made of a light-transmitting resin such as acrylic resin. In the light guide 10, a light emitting surface 11 having an arcuate outer peripheral contour in a cross section perpendicular to the longitudinal direction is formed along the longitudinal direction of the light guide 10 and faces the light emitting surface 11. A small prism group 12 is formed on the peripheral surface.
The light guide 10 is supported on a base 30 made of a metal having rigidity such as aluminum extending along the longitudinal direction of the light guide 10 directly or via an appropriate support.

導光体１０の一端には、ＬＥＤ実装体１５が当該導光体１０の一端面１３に対向するよう配置されている。このＬＥＤ実装体１５は、導光体１０の一端面１３に対向するよう配置された回路基板１６を有し、この回路基板１６の表面上には、発光ダイオード１７が当該回路基板１６に電気的に接続された状態で配置され、この発光ダイオード１７を覆うよう、例えばシリコーン樹脂などの透光性を有する耐熱性樹脂よりなる半球状の封止体１８が設けられている。   At one end of the light guide 10, the LED mounting body 15 is disposed so as to face the one end surface 13 of the light guide 10. The LED mounting body 15 includes a circuit board 16 disposed so as to face the one end surface 13 of the light guide 10, and a light emitting diode 17 is electrically connected to the circuit board 16 on the surface of the circuit board 16. A hemispherical sealing body 18 made of a heat-resistant resin having translucency such as silicone resin is provided so as to cover the light emitting diode 17.

ＬＥＤ実装体１５における回路基板１６の裏面には、当該ＬＥＤ実装体１５に電気的に接続された、表面に配線（図示省略）を有する給電配線板２５が設けられている。この給電配線板２５は、銅などよりなる金属板上に、レジストなどの樹脂よりなる絶縁層を介して配線が形成されて構成され、 当該給電配線板２５には、発光ダイオード１７に電気を供給する電源（図示省略）が接続されている。   On the back surface of the circuit board 16 in the LED mounting body 15, a power supply wiring board 25 that is electrically connected to the LED mounting body 15 and has wiring (not shown) on the front surface is provided. The power supply wiring board 25 is configured by forming a wiring on a metal plate made of copper or the like via an insulating layer made of a resin such as a resist. The power supply wiring board 25 supplies electricity to the light emitting diode 17. A power supply (not shown) is connected.

この例の光源装置は、導光体１０の長手方向に垂直な底板３６およびこの底板３６の周縁に連続して導光体１０の長手方向に沿って伸びる側板３７を有する、例えばアルミウニムなどの金属よりなる断面がＬ字状の支持部材３５を有し、この支持部材３５における底板３６の表面に、給電配線板２５が配置されて固定され、一方、支持部材３５における側板３７は基台３０に固定されている。
また、支持部材３５における底板３６の裏面には、放熱器３８が設けられている。 The light source device of this example includes a bottom plate 36 perpendicular to the longitudinal direction of the light guide 10 and a side plate 37 extending along the longitudinal direction of the light guide 10 continuously to the periphery of the bottom plate 36, for example, a metal such as aluminum urine. The support member 35 having an L-shaped cross section is formed, and the power supply wiring board 25 is disposed and fixed on the surface of the bottom plate 36 of the support member 35, while the side plate 37 of the support member 35 is attached to the base 30. It is fixed.
Further, a radiator 38 is provided on the back surface of the bottom plate 36 in the support member 35.

導光体１０と給電配線板２５との間には、金属製の光反射部材２０が設けられている。具体的に説明すると、この光反射部材２０は、図２にも示すように、給電配線板２５に接近して位置する基端から先端に向かうに従って拡径するテーパ状の光反射面２２が内周面に形成された、導光体１０の長手方向に伸びる外周輪郭が矩形の筒状の光反射面形成部２１と、この光反射面形成部２１の先端に連続して一体に形成された、導光体１０の長手方向に伸びる筒状の導光体受容部２３とを有し、当該導光体受容部２３に導光体１０の一端部が挿入されて受容されることにより、当該光反射部材２０は、光反射面２２がＬＥＤ実装体１５と導光体１０との間の光路を包囲するよう配置されている。
そして、光反射部材２０には、それぞれ光反射面形成部２１の基端面から給電配線板２５に向かって突出して当該給電配線板２５の表面における非配線領域に対接する複数の突出脚部２４が互いに離間して形成されている。図示の例では、光反射面形成部２１の基端面における四隅に合計で４つの突出脚部２４が形成されている。
また、光反射部材２０は、給電配線板２５または基台３０に例えばネジ等によって固定されている。 A metal light reflecting member 20 is provided between the light guide 10 and the power supply wiring board 25. Specifically, as shown in FIG. 2, the light reflecting member 20 has a tapered light reflecting surface 22 whose diameter increases from the proximal end located close to the power supply wiring board 25 toward the distal end. The outer peripheral contour formed on the peripheral surface and extending in the longitudinal direction of the light guide 10 was formed integrally with the rectangular cylindrical light reflecting surface forming portion 21 and the tip of the light reflecting surface forming portion 21 continuously. And a cylindrical light guide receiving part 23 extending in the longitudinal direction of the light guide 10, and one end of the light guide 10 is inserted into the light guide receiving part 23 and received, The light reflecting member 20 is disposed so that the light reflecting surface 22 surrounds the optical path between the LED mounting body 15 and the light guide body 10.
The light reflecting member 20 has a plurality of projecting leg portions 24 that protrude from the base end face of the light reflecting surface forming portion 21 toward the power supply wiring board 25 and come into contact with non-wiring regions on the surface of the power supply wiring board 25. They are formed apart from each other. In the illustrated example, a total of four projecting leg portions 24 are formed at the four corners of the base end surface of the light reflecting surface forming portion 21.
The light reflecting member 20 is fixed to the power supply wiring board 25 or the base 30 with, for example, screws.

光反射部材２０は、例えばアルミニウムによって形成され、光反射面２２すなわち光反射面形成部２１の内周面には、鏡面加工が施されている。
突出脚部２４の突出高さは、ＬＥＤ実装体１５における回路基板１６の厚みより大きいものとされ、これにより、光反射面形成部２１の基端面がＬＥＤ実装体１５における回路基板１６の表面から離隔した状態とされている。突出脚部２４の突出高さがＬＥＤ実装体１５における回路基板１６の厚みより大きいものであることにより、光源装置の製造時において、光反射部材２０を位置合わせして給電配線板２５または基台３０に固定する際に、光反射面形成部２１の基端面がＬＥＤ実装体１５における回路基板１６の表面に接触して当該回路基板１６の配線が損傷することを防止することができる。
突出脚部２４の突出高さは、具体的には０．８〜１．１ｍｍであることが好ましい。
また、光反射部材２０における光反射面形成部２１の基端面が位置される平面レベルと回路基板１６の表面が位置される平面レベルとの間の離間距離は、０．１２〜０．４２ｍｍであることが好ましい。 The light reflecting member 20 is made of, for example, aluminum, and the light reflecting surface 22, that is, the inner peripheral surface of the light reflecting surface forming portion 21 is mirror-finished.
The protruding height of the protruding leg portion 24 is greater than the thickness of the circuit board 16 in the LED mounting body 15, whereby the base end face of the light reflecting surface forming portion 21 is separated from the surface of the circuit board 16 in the LED mounting body 15. It is in a separated state. Since the protruding height of the protruding leg 24 is larger than the thickness of the circuit board 16 in the LED mounting body 15, the light reflecting member 20 is aligned and the power supply wiring board 25 or the base when manufacturing the light source device. When fixing to 30, it is possible to prevent the base end surface of the light reflecting surface forming portion 21 from contacting the surface of the circuit board 16 in the LED mounting body 15 and damaging the wiring of the circuit board 16.
Specifically, the protruding height of the protruding leg 24 is preferably 0.8 to 1.1 mm.
Further, the separation distance between the plane level where the base end face of the light reflecting surface forming portion 21 in the light reflecting member 20 is located and the plane level where the surface of the circuit board 16 is located is 0.12 to 0.42 mm. Preferably there is.

光源装置の各部材の寸法の一例を挙げると、導光体１０は、全長が３４０ｍｍ、最大径が６．０ｍｍ、ＬＥＤ実装体１５は、回路基板１６の寸法が３．０ｍｍ×３．０ｍｍ×０．６８ｍｍ、封止体１８の径が４．８ｍｍ、光反射部材２０は、光反射面形成部２１の長さが２．２ｍｍ、光反射面形成部２１の基端の内径が５．２ｍｍ、光反射面形成部２１の先端の内径が３．２ｍｍ、光反射面形成部２１の外周の寸法が１０ｍｍ×１０ｍｍ、導光体受容部２３の長さが２．８ｍｍ、導光体受容部２３の内径が５．２ｍｍ、突出脚部２４の各々の突出高さが０．９ｍｍ、突出脚部２４の各々の縦横の寸法が１．５ｍｍ×１．５ｍｍ、給電配線板２５の寸法が１３ｍｍ×３０ｍｍ×１．０ｍｍである。   As an example of the dimensions of each member of the light source device, the light guide 10 has a total length of 340 mm, the maximum diameter is 6.0 mm, and the LED mounting body 15 has a circuit board 16 with a dimension of 3.0 mm × 3.0 mm × 0.68 mm, the diameter of the sealing body 18 is 4.8 mm, the light reflecting member 20 has a length of the light reflecting surface forming portion 21 of 2.2 mm, and an inner diameter of the base end of the light reflecting surface forming portion 21 is 5.2 mm. The inner diameter of the tip of the light reflecting surface forming part 21 is 3.2 mm, the outer circumference of the light reflecting surface forming part 21 is 10 mm × 10 mm, the length of the light guide receiving part 23 is 2.8 mm, and the light guide receiving part 23 has an inner diameter of 5.2 mm, each projecting leg 24 has a projecting height of 0.9 mm, each projecting leg 24 has a vertical and horizontal dimension of 1.5 mm × 1.5 mm, and a power supply wiring board 25 has a dimension of 13 mm. X30 mm x 1.0 mm.

上記の光源装置においては、ＬＥＤ実装体１５における発光ダイオード１７から放射された光が、封止体１７および当該ＬＥＤ実装体１５と導光体１０との間の光路を介して直接または光反射部材２０の光反射面２２に反射されながら、導光体１０の一端面１３から当該導光体１０内に入射され、この入射光は、導光体１０によってその周面に反射されながら当該導光体１０の長手方向に導かれると共に、微小プリズム群１２によって光出射面１１に向かって反射され、この反射光が導光体１０の光出射面１１から出射され、例えば原稿台上に載置された原稿の原稿面に照射される。このとき、導光体１０の一端部は、ＬＥＤ実装体１５からの光および熱を受けることによって加熱される。   In the light source device described above, the light emitted from the light emitting diode 17 in the LED mounting body 15 is directly or light reflecting member via the sealing body 17 and the optical path between the LED mounting body 15 and the light guide body 10. The light is incident on the light guide 10 from one end surface 13 of the light guide 10 while being reflected by the light reflecting surface 22, and the incident light is reflected on the peripheral surface by the light guide 10. In addition to being guided in the longitudinal direction of the body 10, it is reflected toward the light exit surface 11 by the small prism group 12, and this reflected light is emitted from the light exit surface 11 of the light guide 10 and placed on, for example, a document table. The original surface of the original is irradiated. At this time, one end portion of the light guide 10 is heated by receiving light and heat from the LED mounting body 15.

而して、本発明の光源装置によれば、ＬＥＤ実装体１５と導光体１０との間の光路を包囲する光反射面形成部２１を有する光反射部材２０が放熱性の高い金属により構成されているため、導光体１０の一端面１３に入射される光の光量を増加させた場合にも、導光体１０の一端部が高い温度に加熱されることが抑制されるので、当該導光体１０の一端部に熱変形が生じることを防止することができる。しかも、光反射部材２０は、その光反射面形成部２１の基端面から給電配線板２５に向かって突出して当該給電配線板２５の表面における非配線領域に対接する複数の突出脚部２４を有し、これにより、光反射面形成部２１の基端面が給電配線板２５の表面から離隔した状態とされているため、光反射部材２０を介して給電配線板２５の表面に形成された配線間およびＬＥＤ実装体１５における回路基板１６の表面に短絡が生じることがない。   Thus, according to the light source device of the present invention, the light reflecting member 20 having the light reflecting surface forming portion 21 that surrounds the optical path between the LED mounting body 15 and the light guide 10 is made of a metal with high heat dissipation. Therefore, even when the amount of light incident on the one end surface 13 of the light guide 10 is increased, the one end of the light guide 10 is suppressed from being heated to a high temperature. It is possible to prevent thermal deformation from occurring at one end of the light guide 10. In addition, the light reflecting member 20 has a plurality of projecting leg portions 24 that protrude from the base end face of the light reflecting surface forming portion 21 toward the power supply wiring board 25 and come into contact with non-wiring regions on the surface of the power supply wiring board 25. As a result, the base end surface of the light reflecting surface forming portion 21 is separated from the surface of the power supply wiring board 25, so that the wiring between the wires formed on the surface of the power supply wiring board 25 via the light reflecting member 20. And a short circuit does not arise in the surface of the circuit board 16 in the LED mounting body 15. FIG.

図３は、本発明の第２の実施の形態に係る光源装置における要部の構成を示す説明用断面図である。この光源装置は、ＬＥＤ実装体１５における回路基板１６と光反射部材２０における光反射面形成部２１との間に、給電配線板２５の表面と光反射部材２０における光反射面形成部２１の基端面との間の間隙に向かう光を遮蔽する遮光体４０が設けられていることを除き、第１の実施の形態に係る光源装置と同様の構成である。
遮光体４０は、ＬＥＤ実装体１５における封止体１８の径より僅かに小さい径の貫通孔４１を有する、電気絶縁性を有する着色された耐熱性樹脂材料により形成された板状体よりなり、光反射面形成部２１の基端面が位置される平面レベルと回路基板１６の表面が位置される平面レベルとの間の距離より小さい厚みを有するものであり、当該遮光体４０の貫通孔４１に封止体１８が挿通されることにより、当該遮光体４０は、貫通孔４１の内周面が封止体１８の周囲を取り囲むよう配置されている。
遮光体４０を構成する耐熱性樹脂材料としては、ポリカーボネート、ポリエーテルエーテルケトンなどを用いることができる。
また、遮光体４０の色は、遮光性が発現されるものであれば特に限定されない。 FIG. 3 is an explanatory cross-sectional view showing the configuration of the main part of the light source device according to the second embodiment of the present invention. In this light source device, the surface of the power supply wiring board 25 and the base of the light reflecting surface forming portion 21 in the light reflecting member 20 are provided between the circuit board 16 in the LED mounting body 15 and the light reflecting surface forming portion 21 in the light reflecting member 20. The configuration is the same as that of the light source device according to the first embodiment, except that a light blocking body 40 that blocks light traveling toward the gap between the end surface and the end surface is provided.
The light shielding body 40 has a through-hole 41 having a diameter slightly smaller than the diameter of the sealing body 18 in the LED mounting body 15 and is formed of a plate-like body formed of a colored heat-resistant resin material having electrical insulation, The light reflecting surface forming portion 21 has a thickness smaller than the distance between the plane level where the base end face is located and the plane level where the surface of the circuit board 16 is located. By inserting the sealing body 18, the light shielding body 40 is arranged so that the inner peripheral surface of the through hole 41 surrounds the periphery of the sealing body 18.
As the heat resistant resin material constituting the light shielding body 40, polycarbonate, polyether ether ketone, or the like can be used.
Further, the color of the light shielding body 40 is not particularly limited as long as the light shielding property is exhibited.

このような光源装置によれば、第１の実施の形態に係る光源装置と同様の効果が得られると共に、遮光体４０によって、ＬＥＤ実装体１５からの光が、光反射部材２０における光反射面形成部２１の基端面と給電配線板２５の表面との間の間隙から放出されることを防止することができ、これにより、光反射面形成部２１の基端面と給電配線板２５の表面との間の間隙から光が放出されることによる迷光の発生を防止することができる。   According to such a light source device, the same effect as that of the light source device according to the first embodiment can be obtained, and light from the LED mounting body 15 can be reflected by the light shielding member 20 on the light reflecting surface of the light reflecting member 20. It can be prevented from being emitted from the gap between the base end face of the forming portion 21 and the surface of the power supply wiring board 25, and thereby the base end face of the light reflecting surface forming portion 21 and the surface of the power supply wiring board 25 can be prevented. Generation of stray light due to light being emitted from the gap between them can be prevented.

図４は、本発明の第３の実施の形態に係る光源装置における要部の構成を示す説明用断面図である。この光源装置は、ＬＥＤ実装体１５における回路基板１６と光反射部材２０における光反射面形成部２１との間に、当該ＬＥＤ実装体１５における封止体１８の周囲を取り囲む光反射面４６を有する電気絶縁性材料よりなる絶縁性光反射部材４５が設けられていることを除き、第１の実施の形態に係る光源装置と同様の構成である。
具体的に説明すると、絶縁性光反射部材４５は、厚み方向に貫通する貫通孔４７を有する、可視光線の光反射率が高い色例えば白色に着色された耐熱性樹脂材料により形成された板状体よりなり、当該貫通孔４７の内周面に光反射面４６が形成されている。絶縁性光反射部材４５における内周面である光反射面４６は、図５にも拡大して示すように、回路基板１６に接近して位置する裏面から光反射面形成部２１に接近して位置する表面に向かうに従って拡径するテーパ状に形成されている。 FIG. 4 is an explanatory cross-sectional view showing the configuration of the main part of the light source device according to the third embodiment of the present invention. This light source device has a light reflecting surface 46 that surrounds the periphery of the sealing body 18 in the LED mounting body 15 between the circuit board 16 in the LED mounting body 15 and the light reflecting surface forming portion 21 in the light reflecting member 20. The configuration is the same as that of the light source device according to the first embodiment except that an insulating light reflecting member 45 made of an electrically insulating material is provided.
More specifically, the insulating light reflecting member 45 has a through hole 47 penetrating in the thickness direction, and is formed of a heat-resistant resin material colored in a color having a high visible light reflectance such as white. The light reflecting surface 46 is formed on the inner peripheral surface of the through hole 47. The light reflecting surface 46, which is the inner peripheral surface of the insulating light reflecting member 45, approaches the light reflecting surface forming portion 21 from the back surface close to the circuit board 16, as shown in FIG. It is formed in a tapered shape whose diameter is increased toward the surface where it is located.

ここで、導光体１０の長手方向に沿った断面において、導光体１０の長手方向と光反射部材２０の光反射面２２とのなす角が、導光体１０の長手方向と絶縁性光反射部材４５の光反射面４６とのなす角より小さくなるよう構成されていることが好ましい。このような構成によれば、光反射部材２０の光反射面２２および絶縁性光反射部材４５の光反射面４６によって、高い集光機能が得られるため、導光体１０の一端面１３に対する光の入射を好適に行うことができ、これにより、一層高い光の利用率が得られる。   Here, in the cross section along the longitudinal direction of the light guide 10, the angle formed by the longitudinal direction of the light guide 10 and the light reflecting surface 22 of the light reflecting member 20 is the same as the longitudinal direction of the light guide 10 and the insulating light. It is preferably configured to be smaller than an angle formed by the light reflecting surface 46 of the reflecting member 45. According to such a configuration, a high light collecting function is obtained by the light reflecting surface 22 of the light reflecting member 20 and the light reflecting surface 46 of the insulating light reflecting member 45. Can be suitably performed, and thereby a higher light utilization rate can be obtained.

また、絶縁性光反射部材４５は、光反射部材２０における光反射面形成部２１の基端面が位置される平面レベルと回路基板１６の表面が位置される平面レベルとの間の距離より小さい厚みを有すると共に、当該絶縁性光反射部材４５の裏面の開口径がＬＥＤ実装体１５における封止体１８の径より僅かに小さいものとされており、表面が光反射面形成部２１の基端面に接し、かつ、裏面がＬＥＤ実装体１５における回路基板１６の表面から間隙Ｓを介して離間した状態で配置されている。このような構成によれば、絶縁性光反射部材４５がＬＥＤ実装体１５における回路基板１６の表面に接触することがないため、当該光源装置の製造時において、当該回路基板１６の配線が損傷することを防止することができる。
絶縁性光反射部材４５を構成する耐熱性樹脂材料としては、ポリカーボネート、ポリエーテルエーテルケトンなどを用いることができる。 The insulating light reflecting member 45 has a thickness smaller than the distance between the plane level where the base end face of the light reflecting surface forming portion 21 of the light reflecting member 20 is located and the plane level where the surface of the circuit board 16 is located. And the opening diameter of the back surface of the insulating light reflecting member 45 is slightly smaller than the diameter of the sealing body 18 in the LED mounting body 15, and the surface is on the base end face of the light reflecting surface forming portion 21. They are in contact with each other and the back surface is separated from the surface of the circuit board 16 in the LED mounting body 15 via the gap S. According to such a configuration, since the insulating light reflecting member 45 does not come into contact with the surface of the circuit board 16 in the LED mounting body 15, the wiring of the circuit board 16 is damaged during the manufacture of the light source device. This can be prevented.
As the heat resistant resin material constituting the insulating light reflecting member 45, polycarbonate, polyether ether ketone, or the like can be used.

このような光源装置によれば、第１の実施の形態および第２の実施の形態に係る光源装置と同様の効果が得られると共に、給電配線板２５の表面と光反射部材２０における光反射面形成部２１の基端面との間の間隙に向かう光が絶縁性光反射部材４５によって反射されて導光体１０の一端面１３に入射されるので、高い光の利用率が得られる。   According to such a light source device, the same effects as the light source devices according to the first and second embodiments can be obtained, and the surface of the power supply wiring board 25 and the light reflecting surface of the light reflecting member 20 can be obtained. Since the light which goes to the gap | interval between the base end surfaces of the formation part 21 is reflected by the insulating light reflection member 45 and enters into the one end surface 13 of the light guide 10, a high light utilization rate can be obtained.

以上、本発明の光源装置を３つの実施の形態を例を挙げて説明したが、本発明は、これらの実施の形態に限定されず種々の変更を加えることが可能である。
例えば、給電配線板２５上には、複数のＬＥＤ実装体１５が配置されていてもよく、また、ＬＥＤ実装体１５には、回路基板１６上に複数の発光ダイオード１７が配置されていてもよい。
また、第１の実施の形態乃至第３の実施の形態に係る光源装置の各々においては、光反射部材２０における光反射面２２は、光反射面形成部２１の軸方向に沿った断面において、光反射面形成部２１の基端から先端までの線が直線状とれさているが、光反射面形成部２１の基端から先端までの線が放物線状のもの、すなわち、光反射面が放物面鏡よりなるものであってもよい。
また、突出脚部２４は、光反射面形成部２１の基端面が給電配線板２５の表面から離間した状態で配置される構成であれば、図２に示すものに限定されず、例えば図６に示すように、光反射面形成部２１の基端面における一側縁およびこれに対向する他側縁の各々に沿って形成された２つの突出脚部２４を有する構成であってもよい。
また、第３の実施の形態に係る光源装置においては、絶縁性光反射部材４５における光反射面４６は、当該絶縁性光反射部材４５の表面に垂直な断面において、絶縁性光反射部材４５の裏面から表面までの線が直線状とれさているが、絶縁性光反射部材４５の裏面から表面までの線が放物線状のもの、すなわち、光反射面４６が放物面鏡よりなるものであってもよい。 The light source device of the present invention has been described with reference to three embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made.
For example, a plurality of LED mounting bodies 15 may be disposed on the power supply wiring board 25, and a plurality of light emitting diodes 17 may be disposed on the circuit board 16 in the LED mounting body 15. .
In each of the light source devices according to the first to third embodiments, the light reflecting surface 22 of the light reflecting member 20 is a cross section along the axial direction of the light reflecting surface forming portion 21. The line from the proximal end to the distal end of the light reflecting surface forming portion 21 is straight, but the line from the proximal end to the distal end of the light reflecting surface forming portion 21 is parabolic, that is, the light reflecting surface is parabolic. It may consist of a plane mirror.
Further, the projecting leg portion 24 is not limited to the one shown in FIG. 2 as long as the base end surface of the light reflecting surface forming portion 21 is arranged away from the surface of the power supply wiring board 25. For example, FIG. As shown in FIG. 3, the light reflecting surface forming part 21 may have a configuration having two protruding legs 24 formed along one side edge of the base end face and the other side edge opposite to the one side edge.
Further, in the light source device according to the third embodiment, the light reflecting surface 46 of the insulating light reflecting member 45 has a cross section perpendicular to the surface of the insulating light reflecting member 45 in the insulating light reflecting member 45. The line from the back surface to the front surface is straight, but the line from the back surface to the front surface of the insulating light reflecting member 45 is parabolic, that is, the light reflecting surface 46 is a parabolic mirror. Also good.

１０ 導光体
１１ 光出射面
１２ 微小プリズム群
１３ 一端面
１５ ＬＥＤ実装体
１６ 回路基板
１７ 発光ダイオード
１８ 封止体
２０ 光反射部材
２１ 光反射面形成部
２２ 光反射面
２３ 導光体受容部
２４ 突出脚部
２５ 給電配線板
３０ 基台
３５ 支持部材
３６ 底板
３７ 側板
３８ 放熱器
４０ 遮光体
４１ 貫通孔
４５ 絶縁性光反射部材
４６ 光反射面
４７ 貫通孔
７０ 導光体
７１ 光出射面
７２ 微小プリズム群
７５ 一端面
８０ 給電配線板
８１ ダイオード素子
８２ 導電性接着材
８３ ワイヤー配線
８５ 発光ダイオード
８６ マイクロバンプ
８７ 封止体
９０ 光反射部材
９１ 光反射面
Ｓ 間隙 DESCRIPTION OF SYMBOLS 10 Light guide 11 Light emission surface 12 Micro prism group 13 One end surface 15 LED mounting body 16 Circuit board 17 Light emitting diode 18 Sealing body 20 Light reflection member 21 Light reflection surface formation part 22 Light reflection surface 23 Light guide body acceptance part 24 Projection leg 25 Power supply wiring board 30 Base 35 Support member 36 Bottom plate 37 Side plate 38 Radiator 40 Light shield 41 Through hole 45 Insulating light reflecting member 46 Light reflecting surface 47 Through hole 70 Light guide 71 Light emitting surface 72 Micro prism Group 75 One end face 80 Power supply wiring board 81 Diode element 82 Conductive adhesive 83 Wire wiring 85 Light emitting diode 86 Micro bump 87 Sealing body 90 Light reflecting member 91 Light reflecting surface S Gap

Claims (4)

棒状の導光体と、
回路基板、この回路基板の表面上に配置された発光ダイオードおよびこの発光ダイオードを覆うよう設けられた透光性の封止体よりなり、前記導光体の一端面に対向するよう配置されたＬＥＤ実装体と、
このＬＥＤ実装体における回路基板の裏面に配置され、当該ＬＥＤ実装体に電気的に接続された、表面に配線を有する給電配線板と、
この給電配線板に接近して位置する基端から先端に向かうに従って拡径する光反射面が内周面に形成された筒状の光反射面形成部、およびこの光反射面形成部の先端に連続して一体に形成された、導光体の長手方向に伸びる筒状の導光体受容部を有し、当該導光体受容部に導光体の一端部が挿入され、前記光反射面が前記ＬＥＤ実装体と前記導光体との間の光路を包囲するよう配置された金属製の光反射部材とを具えてなり、
前記光反射部材は、それぞれ前記光反射面形成部の基端面から前記給電配線板に向かって突出して当該給電配線板の表面における非配線領域に対接する複数の突出脚部を有し、当該光反射面形成部の基端面が前記回路基板の表面から離隔するよう配置されていることを特徴とする光源装置。 A rod-shaped light guide,
An LED which is composed of a circuit board, a light emitting diode disposed on the surface of the circuit board, and a light-transmitting sealing body provided so as to cover the light emitting diode, and is disposed so as to face one end surface of the light guide body An implementation,
A power supply wiring board disposed on the back surface of the circuit board in this LED mounting body and electrically connected to the LED mounting body, and having wiring on the surface,
A cylindrical light reflecting surface forming portion having an inner peripheral surface formed with a light reflecting surface whose diameter increases toward the tip from the proximal end positioned close to the power supply wiring board , and the tip of the light reflecting surface forming portion. A cylindrical light guide receiving portion that extends continuously in the longitudinal direction of the light guide, and one end of the light guide is inserted into the light guide receiving portion, and the light reflecting surface Comprising a metal light reflecting member arranged so as to surround an optical path between the LED mounting body and the light guide body,
The light reflecting member has a plurality of projecting leg portions that project from the base end face of the light reflecting surface forming portion toward the power supply wiring board and come into contact with non-wiring regions on the surface of the power supply wiring board. A light source device, characterized in that a base end surface of a reflection surface forming portion is disposed so as to be separated from a surface of the circuit board. 前記給電配線板の表面と前記光反射面形成部の基端面との間の間隙に向かう光を遮蔽する遮光体が設けられていることを特徴とする請求項１に記載の光源装置。   2. The light source device according to claim 1, further comprising: a light shielding unit that shields light traveling toward a gap between a surface of the power supply wiring board and a base end surface of the light reflection surface forming unit. 前記回路基板と前記光反射面形成部との間には、前記封止体の周囲を取り囲み、当該回路基板に接近して位置する裏面から当該光反射面形成部に接近して位置する表面に向かうに従って拡径する光反射面を有する電気絶縁性材料よりなる絶縁性光反射部材が設けられていることを特徴とする請求項１に記載の光源装置。   Between the circuit board and the light reflecting surface forming portion, the surface surrounding the sealing body is located near the light reflecting surface forming portion from the back surface located close to the circuit substrate. The light source device according to claim 1, wherein an insulating light reflecting member made of an electrically insulating material having a light reflecting surface that expands in diameter as it goes is provided. 前記給電配線板は、金属板上に絶縁層を介して配線が形成されてなるものであることを特徴とする請求項１乃至請求項３のいずれかに記載の光源装置。
The light source device according to any one of claims 1 to 3, wherein the power supply wiring board is formed by wiring on a metal plate via an insulating layer.
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