JP2010072509A - Reflecting mirror and light bulb with reflecting mirror - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reflecting mirror 13 capable of improving light utilization factor. <P>SOLUTION: A rotary body-like reflecting mirror body 31 having a diameter increasing from one end side to the other end side around the center axis is provided. A reflective surface 35 is provided to the inner surface of the reflecting mirror body 31. Planar facets 51 divided into a plurality of pieces are formed on the reflective surface 35 in the circumferential direction and a curved reflective surface part 52 is formed between the adjacent facets 51 to be continued to the facets 51. The light utilization factor is improved by eliminating edges from the reflective surface 35 and controlling the light also by the curved reflective surface part 52 in addition to the facets 51. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reflecting mirror that reflects light in combination with a lamp, and a light bulb with a reflecting mirror using the reflecting mirror.

  2. Description of the Related Art Conventionally, a light bulb with a reflecting mirror is composed of a reflecting mirror, a lamp such as a halogen lamp disposed in the reflecting mirror, and a base provided at an end of the reflecting mirror.

  The reflecting mirror is a rotating body whose diameter increases from one end side to the other end side about the lamp axis, and includes a substantially bowl-shaped reflecting mirror body, and a reflecting surface facing the lamp on the inner surface of the reflecting mirror body Is formed.

In the case of a halogen lamp, since the filament coil is spiral, unevenness in brightness and darkness is likely to occur on the irradiated surface, and for the purpose of suppressing this, the reflecting surface of the reflector is a facet that is a small reflecting surface divided into a plurality of parts. Is formed into a polyhedron (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 62-64001 (page 2-3, Fig. 1-4)

  In the conventional reflector, the boundary between facets is formed at the edge. However, the edge portion does not contribute to the light control, and becomes a resistance when the reflecting mirror body is detached from the mold at the time of manufacturing, which may cause distortion in the reflecting mirror body. Furthermore, when a dichroic film is deposited on the reflecting surface of the reflecting mirror, a dichroic film having a uniform thickness is formed because the entry angle of the evaporated film material flying from the evaporation source greatly changes in the boundary region of the edge. It becomes difficult. Thus, the boundary between the facets is an edge, which is a factor of reducing the light utilization rate comprehensively.

  This invention is made | formed in view of such a point, and it aims at providing the reflecting mirror which can improve a light utilization rate, and a light bulb with a reflecting mirror.

  The reflecting mirror according to claim 1 is a rotating mirror-shaped reflecting mirror main body whose diameter increases from one end side to the other end side with the central axis as a center; and is formed on the inner surface of the reflecting mirror main body, And a reflecting surface in which a curved reflecting surface portion having a curved surface continuous with these facets is formed between adjacent facets. .

  The reflector body is formed of, for example, glass, metal material, synthetic resin such as polyetherimide, and has a substantially bowl shape that opens from one end side to the other end side. It may be attached. A light source can be inserted and arranged from the top side which is one end side of the reflecting mirror body.

  The facet is divided into a predetermined number of divisions according to the use of the reflecting mirror. The curved reflecting surface portion may be, for example, an arc or an elliptical curved surface, or may be a so-called free surface curved surface whose curvature is not constant. The curved reflecting surface portion is continuous with the adjacent facets, so that there is no edge and the reflecting surface changes continuously.

  An infrared transmission visible light reflection film or the like may be formed on the reflection surface.

  The reflecting mirror according to claim 2 is the reflecting mirror according to claim 1, wherein the facet is concave in the outer diameter direction between the one end portions of the adjacent facets, and is convex in the central direction between the other end portions. The curved reflection surface portion is formed so that a concave curved surface reflection surface portion is formed between one end portion of the concave facet, and a convex curved surface shape is formed between the other end portions of the convex facet. An inner diameter at which a virtual intersection extending from the outer diameter side where the imaginary line extending one end of the concave facet intersects and a virtual line extending from the other end of the convex facet intersect is formed. The distance in the radial direction from the virtual intersection on the side is D, the distance between the virtual intersection on the inner diameter side and the concave curved curved reflecting surface portion is d1, and the virtual intersection on the outer diameter side and the convex curved curved reflecting surface portion When the distance is d2, it has the following relationship: 0.9 <d1 / D <1 0 .9 <d2 / D <1 d1> d2.

  If d1 / D and d2 / D are less than 0.9, the facet length is shortened, making the required light distribution design difficult, while if d1 / D and d2 / D are greater than 1, Since an edge of the boundary appears clearly, it is preferable that 0.9 <d1 / D <1 0.9 <d2 / D <1.

  An edge having a convex shape between adjacent facets has a greater influence on light extraction efficiency than an edge having a concave shape. Therefore, d1> d2 so that the curved curved reflecting surface does not become an edge. It is preferable that the relationship is

  The shape of the facets divided into a plurality of concave and convex shapes may be, for example, a curved surface of an arc or an ellipse, or may be a so-called free surface whose curvature is not constant.

  The reflecting mirror according to claim 3 is the reflecting mirror according to claim 1 or 2, wherein the reflecting surface is formed with a plurality of planar facets divided in the axial direction between adjacent facets. A curved reflecting surface portion continuous with these facets is formed.

  The facet is divided into a predetermined number of divisions according to the use of the reflecting mirror. Further, the curved reflecting surface portion may be, for example, a circular or elliptical curved surface, or a so-called free surface curved surface having a constant curvature. The curved reflecting surface portion is continuous with the adjacent facets, so that there is no edge and the reflecting surface changes continuously.

  A reflecting mirror according to claim 4 is the reflecting mirror according to any one of claims 1 to 3; the reflecting mirror according to any one of claims 1 to 3; a lamp disposed in the reflecting mirror; And a base provided on one end side.

  For example, a halogen lamp is used as the lamp. The filament coil of this halogen lamp has a spiral shape and is disposed along the central axis of the reflecting mirror.

  As the base, for example, an E11 mountable socket can be used.

  According to the reflecting mirror of claim 1, on the reflecting surface of the inner surface of the reflecting mirror main body, a planar facet divided into a plurality of parts in the circumferential direction is formed, and these facets are arranged between adjacent facets. Since the continuous curved reflecting surface portion is formed, the edges can be eliminated, and the light can be controlled by the curved reflecting surface portion in addition to the facet, and the light utilization rate can be improved.

  According to the reflecting mirror described in claim 2, in addition to the effect of the reflecting mirror described in claim 1, the relationship between the facet and the curved reflecting surface portion can be defined within a designable range so as to improve the light utilization rate. .

  According to the reflecting mirror described in claim 3, in addition to the effect of the reflecting mirror described in claim 1 or 2, the reflecting surface of the inner surface of the reflecting mirror main body has a planar facet divided into a plurality in the axial direction. In addition to forming a curved reflection surface portion that is continuous with these facets between adjacent facets, edges can be eliminated, and light can be controlled by the curved reflection surface portion in addition to the facets, thereby improving the light utilization rate. .

  According to the light bulb with a reflector according to claim 4, the light utilization rate of the reflector can be improved, and a highly efficient light bulb with a reflector can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 3 show a first embodiment, in which FIG. 1 is a partial cross-sectional view in the circumferential direction of the reflector, FIG. 2 is a partial cross-sectional view in the axial direction of the reflector, and FIG. It is sectional drawing of a light bulb with a mirror.

  As shown in FIG. 3, reference numeral 11 denotes a light bulb with a reflecting mirror. The light bulb 11 with a reflecting mirror includes a halogen lamp 12 as a lamp, a reflecting mirror 13 in which the halogen lamp 12 is disposed inside, and one end of the reflecting mirror 13. A base 14 is provided.

  The halogen lamp 12 is formed of, for example, quartz glass in a cylindrical shape and includes a bulb 21. A sealing portion 22 is formed at one end of the bulb 21, and an exhaust chip off portion 23 is formed at the other end. And an inert gas is enclosed.

  Inside the bulb 21, for example, a filament coil 24 having a double coil structure in which two coils are wound is disposed along the central axis of the halogen lamp 12. Both ends of the filament coil 24 are connected to and supported by a pair of internal lead wires 25. These internal lead wires 25 are connected to the sealing portion 22 of the valve 21 together with a pair of external metal wires 26 via a pair of sealing metal foils 26. It is sealed and fixed.

  In addition, the reflecting mirror 13 is integrally formed with a reflecting mirror main body 31 made of glass, for example, and a cylindrical base 32 into which the halogen lamp 12 is inserted is formed on one end side with respect to the central axis x. Thus, a substantially bowl-shaped reflecting mirror portion 33 is formed which has a rotating body shape whose diameter increases from the base portion 32 toward the other end and opens. A translucent front cover may be attached to the opening 34 on the other end side of the reflecting mirror portion 33. On the inner surface of the reflecting mirror portion 33, a reflecting surface 35 for reflecting the light of the halogen lamp 12 toward the opening 34 is formed. The reflection surface 35 is formed with an infrared transmission visible light reflection film, and is configured as a dichroic mirror.

  The base 14 is of E11 type and is provided at a support portion 41 made of porcelain fixed to the outer periphery of the base 32 of the reflecting mirror 13, a shell 42 fixed by caulking to the support portion 41, and one end of the support portion. Eyelet 43. Each external lead-in wire 27 of the halogen lamp 12 is connected to the shell 42 and the eyelet 43, respectively.

  Next, as shown in FIG. 1, the reflecting surface 35 of the reflecting mirror 13 is formed with a plurality of planar (straight) facets 51 divided in the circumferential direction and adjacent facets 51. Between these facets 51, curved curved reflecting surface portions 52 that are continuous with the facets 51 are formed, and as shown in FIG. 2, planar (straight) facets 51 that are divided into a plurality of portions in the axial direction are formed. In addition, a curved reflecting surface portion 53 that is continuous with the facets 51 is formed between the adjacent facets 51.

  As shown in FIG. 1, in the circumferential direction of the reflecting surface 35 of the reflecting mirror 13, the facets 51 are surfaces perpendicular to the central axis x and are formed with a predetermined width a and are equally spaced in the circumferential direction. It is formed every time. The curved reflecting surface portion 52 has a predetermined width b and connects the end portions of the adjacent facets 51 with a continuous curved surface. The curved reflecting surface portion 52 may be an arc or an elliptical curved surface, and the curvature is not constant. It may be a curved surface with a free surface. Therefore, in the circumferential direction of the reflecting surface 35 of the reflecting mirror 13, the curved reflecting surface portion 52 is continuous with the adjacent facet 51, so that the reflecting surface 35 is continuously changed without an edge.

  As shown in FIG. 2, in the axial direction of the reflecting surface 35 of the reflecting mirror 13, the facet 51 is a surface perpendicular to the central axis x and is formed with a predetermined width c and at equal intervals in the axial direction or It is formed at different intervals. The curved reflecting surface portion 53 has a predetermined width d and connects the end portions of the adjacent facets 51 with a continuous curved surface. The curved reflecting surface portion 53 may be an arc or an elliptical curved surface, and the curvature is not constant. It may be a curved surface with a free surface. Therefore, in the axial direction of the reflecting surface 35 of the reflecting mirror 13, the curved reflecting surface portion 53 is continuous with the adjacent facet 51, so that the reflecting surface 35 is continuously changed without an edge.

  Each type of reflecting mirror 13 has a light distribution of narrow angle, medium angle, and wide angle, the opening diameter of the reflecting mirror 13 is 50 mm, and the coil length of the filament coil 24 of the halogen lamp 12 is 6.2 mm and 5.5 mm. In some cases, the number of divisions of the facets 51 in the circumferential direction is preferably 36, and the number of divisions of the facets 51 in the axial direction is preferably 19 or 20.

  Thus, the reflecting mirror 13 forms a planar facet 51 that is divided into a plurality of parts in the circumferential direction of the reflecting surface 35, and a curved reflecting surface portion that is continuous between these facets 51 between adjacent facets 51. Since 52 is formed, the edge is eliminated, and the light from the halogen lamp 12 can be controlled not only by the facet 51 but also by the curved reflecting surface portion 52, and the light utilization rate can be improved. Further, in the axial direction of the reflecting surface 35, a planar facet 51 divided into a plurality of parts is formed, and a curved reflecting surface part 53 continuous to these facets 51 is formed between the adjacent facets 51. In addition, the light can be controlled by the curved reflecting surface portion 53 in addition to the facet 51, and the light utilization rate can be improved.

  Therefore, by eliminating the edge from the reflecting surface 35 of the reflecting mirror 13, there is no part that does not contribute to the light control, and when the reflecting mirror body 31 is detached from the mold during manufacturing, the reflecting mirror body 31 is distorted. In addition, when a dichroic film is deposited on the reflecting surface 35 of the reflecting mirror 13, the entry angle of the evaporated film material flying from the evaporation source may change greatly in the boundary region like an edge. Therefore, a dichroic film having a uniform thickness can be formed. Thus, since the boundary between the facets 51 has no edge and is formed by a continuous curved surface, the light utilization rate can be improved comprehensively.

  Next, FIG. 4 shows a second embodiment, and FIG. 4 is a sectional view of a part of the reflecting mirror in the circumferential direction.

  As shown in FIG. 4, in the circumferential direction of the reflecting surface 35 of the reflecting mirror 13, the facet 51 is concave in the outer diameter direction between one end portions of adjacent facets 51, and the center direction is between the other end portions. It is formed to be convex.

  A virtual intersection P1 where a virtual line extending from one end of each concave facet 51 intersects is arranged on the same circumference around the central axis x, and the other of the convex facets 51 Virtual intersections P2 at which the virtual lines extending from the ends meet are arranged on the same circumference centered on the central axis x.

  When the angle formed by the adjacent facets 51 is θ, it is preferable that the angle is in the range of 0.5 ° <θ <30 °.

  In addition, the curved reflecting surface portion 52 is formed with a concave curved curved reflecting surface portion 52a continuous with the facets 51 between one end portions of the concave facets 51, and the other end of the convex facets 51. Convex-curved curved reflecting surface portions 52b that are continuous with these facets 51 are formed between the portions.

A virtual intersection P1 on the outer diameter side where a virtual line extending one end of the facet 51 that is concave intersects and a virtual intersection P2 on the inner diameter side where a virtual line extending the other end of the convex facet 51 intersects , D1 is the distance between the inner diameter side virtual intersection P2 and the concave curved curved reflection surface 52a, and the distance between the outer diameter virtual intersection P1 and the convex curved reflection surface 52b is D1. Where d2 is 0.9 <d1 / D <1
0.9 <d2 / D <1
d1> d2

  If d1 / D and d2 / D are smaller than 0.9, the length of the facet 51 is shortened and the required light distribution design becomes difficult. On the other hand, if d1 / D and d2 / D are larger than 1. Since the boundary edge of the facet 51 appears clearly, it is preferable that 0.9 <d1 / D <1 0.9 <d2 / D <1.

  An edge having a convex shape between adjacent facets 51 has a greater influence on light extraction efficiency than an edge having a concave shape, so that the curved curved reflecting surface 52a does not become an edge. It is preferable that the relationship is> d2.

  With such a relationship, the relationship between the facet 51 of the reflecting mirror 13 and the curved reflecting surface portions 52a and 52b can be defined within a designable range so that the light utilization rate can be improved.

It is sectional drawing of a part of the circumferential direction of the reflective mirror which shows the 1st Embodiment of this invention. It is sectional drawing of a part of axial direction of a reflective mirror same as the above. It is sectional drawing of a light bulb with a reflective mirror same as the above. It is sectional drawing of a part of the circumferential direction of the reflective mirror which shows the 2nd Embodiment of this invention.

Explanation of symbols

11 Light bulb with reflector
12 Halogen lamp as lamp
13 Reflector
14 base
31 Reflector body
35 Reflective surface
51 Facet
52 Curved reflective surface
53 Curved reflective surface x Central axis

Claims (4)

A rotating mirror-shaped reflecting mirror main body whose diameter increases from one end side toward the other end side around the central axis;
Formed on the inner surface of the reflecting mirror body and formed into a plurality of planar facets divided in the circumferential direction, and a curved curved reflecting surface portion continuous to these facets is formed between adjacent facets. A reflective surface being made;
A reflecting mirror characterized by comprising: The facet is formed such that the gap between one end of adjacent facets is concave in the outer diameter direction, and the gap between the other end is convex in the center direction.
The curved reflecting surface portion has a concave curved curved reflecting surface portion formed between one end of a concave facet, and a convex curved reflecting surface portion is formed between the other end of the convex facet. Formed,
A radial intersection between an imaginary line on the outer diameter side where an imaginary line extending one end of the concave facet intersects an imaginary line on the inner diameter side where an imaginary line extending the other end of the convex facet intersects When the distance is D, the distance between the virtual intersection on the inner diameter side and the concave curved curved reflection surface portion is d1, and the distance between the virtual intersection on the outer diameter side and the convex curved reflection surface portion is d2, the following: 0.9 <d1 / D <1 with relationship
0.9 <d2 / D <1
d1> d2
The reflecting mirror according to claim 1. The reflecting surface is formed with a plurality of planar facets divided in the axial direction, and a curved reflecting surface portion continuous to these facets is formed between adjacent facets. Item 3. A reflecting mirror according to item 1 or 2. A reflecting mirror according to any one of claims 1 to 3;
A lamp arranged in the reflector;
A base provided at one end of the reflector;
A light bulb with a reflector, comprising:

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