JP2011198659A - Led lamp and vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lamp capable of increasing proportion of light to proceed in a desired direction, and a vehicular lighting fixture to have it.SOLUTION: In an LED lamp 100 equipped with a light guide lens 2 to guide the light from an LED light source 1, an incident face 2a, an inside reflecting face 2b, an outside reflecting face 2c, and an emitting face 2d are installed at the light guide lens 2. The inside reflecting face 2b is formed by rotating a quarter arc 2b1 around the center axial line 2' arranged so that a tangent line to pass through the end point 2b1a becomes parallel with the center axial line 2', so that the tangent line to pass through the end point 2b1b becomes perpendicular to the center axial line 2', and so that the end point 2b1a is positioned closer to the center axial line 2' than the end point 2b1b. The outside reflecting face 2c is formed by rotating a quarter arc 2c1 around the center axial line 2' arranged so that the tangent line to pass through the end point 2c1a becomes parallel with the center axial line 2', so that the tangent line to pass through the end point 2c1b becomes perpendicular to the center axial line 2', and so that the end point 2c1a is positioned closer to the center axial line 1' than the end point 2c1b.

Description

  The present invention relates to an LED lamp including an LED light source and a light guide lens that guides light from the LED light source, and a vehicular lamp having the LED lamp.

  In particular, the present invention relates to an LED lamp capable of increasing the proportion of light traveling in a desired direction and a vehicular lamp having the LED lamp.

  2. Description of the Related Art Conventionally, an LED lamp including an LED light source and a light guide lens that guides light from the LED light source is known. Examples of this type of LED lamp include those described in FIG. 1 and FIG. 4 of Patent Document 1 (Japanese Patent Laid-Open No. 2002-100217). In the LED lamp described in FIG. 1 and FIG. 4 of Patent Document 1, light from an LED light source is guided by a reflector having a hollow cylindrical reflecting surface, and is incident through an incident surface of a light guide lens. The light is reflected by the rotating hyperbolic reflecting surface of the light guide lens and emitted through the light exit surface of the light guide lens. Specifically, in the LED lamp described in FIG. 1 and FIG. 4 of Patent Document 1, the light transmitted through the focal point f1 of the rotating hyperbolic reflecting surface of the light guide lens out of the light from the LED light source is guided. The optical path of the reflected light from the rotating hyperbolic reflecting surface of the light guide lens matches the optical path of the emitted light from the focal point f2 of the rotating hyperbolic reflecting surface of the light guide lens. It is configured as follows.

JP 2002-100217 A

  By the way, in the LED lamp described in FIG. 1 and FIG. 4 of patent document 1, it is hollow so that most of the light from an LED light source may be condensed on the focus f1 of the rotation hyperbolic reflection surface of a light guide lens. A reflector having a cylindrical reflecting surface is not configured. Therefore, in the LED lamp described in FIG. 1 and FIG. 4 of Patent Document 1, only a part of the light from the LED light source is condensed at the focal point f1 of the rotating hyperbolic reflecting surface of the light guide lens. The light traveling in a desired direction (specifically, the light traveling on the optical path that coincides with the optical path of the radiated light from the focal point f2 of the rotating hyperbolic reflecting surface of the light guide lens) is transmitted through the exit surface of the light guide lens. And exit. That is, in the LED lamp described in FIG. 1 and FIG. 4 of Patent Document 1, the ratio of light traveling in a desired direction cannot be sufficiently increased.

  Specifically, the LED lamp described in FIGS. 1 and 4 of Patent Document 1 is configured such that light from the LED light source is reflected only once by the rotating hyperbolic reflecting surface of the light guide lens. Therefore, in the LED lamp described in FIGS. 1 and 4 of Patent Document 1, light from the LED light source that has not been condensed at the focal point f1 of the rotational hyperbolic reflection surface of the light guide lens is rotated by the rotational twin of the light guide lens. When reflected by the curved reflecting surface, the optical path of the reflected light from the rotating hyperbolic reflecting surface of the light guide lens is greatly deviated from the optical path of the light traveling in a desired direction.

  In view of the above problems, an object of the present invention is to provide an LED lamp capable of increasing the proportion of light traveling in a desired direction and a vehicular lamp having the LED lamp.

According to the invention described in claim 1, the LED light source (1; 1a, 1b, 1c) and the light guide lens (2) for guiding light from the LED light source (1; 1a, 1b, 1c) are provided. Equipped,
An incident surface (2a), an inner reflection surface (2b), an outer reflection surface (2c), and an emission surface (2d) are provided on the light guide lens (2),
A tangent line (L2b1a) passing through one end point (2b1a) is parallel to the central axis (2 ′) of the light guide lens (2), and a tangent line (L2b1b) passing through the other end point (2b1b) is the light guide lens (2). So that one end point (2b1a) is positioned closer to the central axis (2 ') of the light guide lens (2) than the other end point (2b1b). The inner arc surface (2b) is formed by rotating the quarter arc (2b1) arranged at the center of the central axis (2 ′) of the light guide lens (2),
A tangent line (L2c1a) passing through one end point (2c1a) is parallel to the central axis (2 ′) of the light guide lens (2), and a tangent line (L2c1b) passing through the other end point (2c1b) is the light guide lens (2). So that one end point (2c1a) is positioned closer to the center axis (2 ') of the light guide lens (2) than the other end point (2c1b). The outer arc surface (2c) is formed by rotating the quarter arc (2c1) arranged on the center axis (2 ′) of the light guide lens (2),
The center point (C2c1) of the quarter arc (2c1) of the outer reflective surface (2c) is made more incident than the center point (C2b1) of the quarter arc (2b1) of the inner reflective surface (2b) ( 2a) on the side away from the central axis (2 ′) of the light guide lens (2),
The light from the LED light source (1; 1a, 1b, 1c) incident through the incident surface (2a) of the light guide lens (2) is divided into four minutes on the inner reflection surface (2b) of the light guide lens (2). Is transmitted between one end point (2b1a) of one arc (2b1) and one end point (2c1a) of a quarter arc (2c1) of the outer reflective surface (2c) of the light guide lens (2). The other end point (2b1b) of the quarter arc (2b1) of the inner reflection surface (2b) of the light guide lens (2) is reflected a plurality of times by the inner reflection surface (2b) of the light guide lens (2). The light is transmitted through the quarter end (2c1b) of the quarter arc (2c1) of the outer reflective surface (2c) of the light guide lens (2), and the light exiting surface (2d) of the light guide lens (2) is transmitted. There is provided an LED lamp (100) characterized in that it emits through.

  According to the second aspect of the present invention, the light from the LED light source (1; 1a, 1b, 1c) incident through the incident surface (2a) of the light guide lens (2) is totally reflected to guide the light. One end point (2b1a) of a quarter arc (2b1) of the inner reflective surface (2b) of the lens (2) and a quarter arc (2c1) of the outer reflective surface (2c) of the light guide lens (2) The guide reflecting surface (2e) for guiding light between the one end point (2c1a) and the one end point (2c1a) of the quarter arc (2c1) of the outer reflecting surface (2c) and the incident surface (2a) The LED lamp (100) according to claim 1, wherein the LED lamp (100) is disposed between the outer edge (2a1) of the LED.

  According to the invention described in claim 3, the pseudo focal point (100a) of the light emitted through the exit surface (2d) of the light guide lens (2) of the LED lamp (100) according to claim 1 or 2 is provided. A vehicular lamp (200) is provided that is disposed on or near the focal point (200a1) of a parabolic reflecting surface (201a) of a reflector (201).

  In the LED lamp (100) according to claim 1, an LED light source (1; 1a, 1b, 1c) and a light guide lens (2) for guiding light from the LED light source (1; 1a, 1b, 1c). And are provided. In addition, an incident surface (2a), an inner reflection surface (2b), an outer reflection surface (2c), and an emission surface (2d) are provided on the light guide lens (2).

  Specifically, in the LED lamp (100) according to claim 1, the tangent (L2b1a) passing through one end point (2b1a) is parallel to the central axis (2 ′) of the light guide lens (2), and the other The tangent line (L2b1b) passing through the end point (2b1b) is perpendicular to the central axis (2 ′) of the light guide lens (2), and one end point (2b1a) is more guided than the other end point (2b1b). A quarter arc (2b1) arranged so as to be located near the central axis (2 ′) of the lens (2) is rotated around the central axis (2 ′) of the light guide lens (2). Thus, the inner reflection surface (2b) is formed.

  In the LED lamp (100) according to claim 1, the tangent line (L2c1a) passing through one end point (2c1a) is parallel to the central axis (2 ′) of the light guide lens (2), and the other end point ( 2c1b) so that the tangent (L2c1b) passing through the light guide lens (2) is perpendicular to the central axis (2 ′) of the light guide lens (2), and one end point (2c1a) is more than the other end point (2c1b). 2) The quarter arc (2c1) arranged so as to be located near the central axis (2 ′) of 2) is rotated outside by rotating around the central axis (2 ′) of the light guide lens (2). A reflective surface (2c) is formed.

  Furthermore, in the LED lamp (100) according to claim 1, the center point (C2c1) of the quarter arc (2c1) of the outer reflective surface (2c) is a quarter arc of the inner reflective surface (2b). It is arranged on the side farther from the incident surface (2a) than the center point (C2b1) of (2b1) and closer to the central axis (2 ′) of the light guide lens (2).

  Furthermore, in the LED lamp (100) according to claim 1, the light from the LED light source (1; 1a, 1b, 1c) incident through the incident surface (2a) of the light guide lens (2) is guided. One end point (2b1a) of a quarter arc (2b1) of the inner reflection surface (2b) of the optical lens (2) and a quarter arc (2c1) of the outer reflection surface (2c) of the light guide lens (2). ) To one end point (2c1a). Next, one end point (2b1a) of a quarter arc (2b1) of the inner reflective surface (2b) of the light guide lens (2) and a quarter of the outer reflective surface (2c) of the light guide lens (2). The light transmitted between one end point (2c1a) of the arc (2c1) is reflected a plurality of times by the inner reflection surface (2b) of the light guide lens (2). In other words, one end point (2b1a) of the quarter arc (2b1) of the inner reflection surface (2b) of the light guide lens (2) and a quarter of the outer reflection surface (2c) of the light guide lens (2). The light transmitted between one end point (2c1a) of the arc (2c1) is guided to the outer reflection surface (2b) and the outer side of the light guide lens (2) as if it were guided by an optical fiber. Light is guided in the curved light guide path between the reflecting surface (2c). As a result, the other end point (2b1b) of the quarter arc (2b1) of the inner reflection surface (2b) of the light guide lens (2) and the fourth of the outer reflection surface (2c) of the light guide lens (2). Most of the light transmitted between the other end point (2c1b) of one arc (2c1) becomes light traveling in a desired direction. Next, the other end point (2b1b) of the quarter arc (2b1) of the inner reflection surface (2b) of the light guide lens (2) and the quarter of the outer reflection surface (2c) of the light guide lens (2). The light transmitted between the other end point (2c1b) of the arc (2c1) is emitted through the emission surface (2d) of the light guide lens (2).

  That is, according to the LED lamp (100) according to claim 1, most of the light transmitted between the inner reflection surface (2b) and the outer reflection surface (2c) of the light guide lens (2), Light that travels in a desired direction can be obtained by a light guide action similar to that of an optical fiber.

  Therefore, according to the LED lamp (100) of the first aspect, only the light that can be transmitted through the focal point of the rotating hyperbolic reflecting surface among the light from the LED light source can be made to travel in a desired direction. Compared with the LED lamp described in FIG. 4 of Patent Document 1, it is possible to increase the proportion of light traveling in a desired direction.

  In the LED lamp (100) according to claim 2, the light from the LED light source (1; 1a, 1b, 1c) incident through the incident surface (2a) of the light guide lens (2) is totally reflected. One end point (2b1a) of a quarter arc (2b1) of the inner reflection surface (2b) of the light guide lens (2) and a quarter arc of the outer reflection surface (2c) of the light guide lens (2) ( 2c1) has a guide reflecting surface (2e) for guiding light between one end point (2c1a) and one end point (2c1a) of a quarter arc (2c1) of the outer reflecting surface (2c). It arrange | positions between the outer edge parts (2a1) of (2a).

  Therefore, according to the LED lamp (100) of the second aspect, the light is incident through the incident surface (2a) of the light guide lens (2), and the outer reflective surface (of the surface of the light guide lens (2) ( 2c) from the LED light source (1; 1a, 1b, 1c) reaching the portion between one end point (2c1a) of the quarter arc (2c1) and the outer edge (2a1) of the incident surface (2a). Is one quarter end (2b1a) of the quarter arc (2b1) of the inner reflection surface (2b) of the light guide lens (2) and four minutes of the outer reflection surface (2c) of the light guide lens (2). The effective utilization rate of the light from the LED light source (1; 1a, 1b, 1c) can be improved as compared with the case where light is not guided between one end point (2c1a) of one arc (2c1).

  In the vehicular lamp (200) according to claim 3, the pseudo focal point of the light emitted through the exit surface (2d) of the light guide lens (2) of the LED lamp (100) according to claim 1 or 2 ( 100a) is arranged on or near the focal point (200a1) of the parabolic reflecting surface (201a) of the reflector (201).

  Therefore, according to the vehicular lamp (200) according to claim 3, the filament of the light bulb type lamp is disposed on or near the focal point (200a1) of the parabolic reflection surface (201a) of the reflector (201). It is possible to realize the same light distribution characteristics as in the case of

It is a fragmentary sectional top view of LED lamp 100 of a 1st embodiment. It is the figure which showed the light guide lens 2 etc. which comprise some LED lamps 100 of 1st Embodiment. It is the figure which showed the example which applied the LED lamp 100 of 1st Embodiment to the vehicle lamp 200. FIG. It is a fragmentary sectional top view of LED lamp 100 of a 3rd embodiment. It is the figure which showed the light guide lens 2 etc. which comprise some LED lamps 100 of 3rd Embodiment. It is a front view of the LED lamp 100 of 4th Embodiment. It is a fragmentary sectional view along the AA line of FIG. It is a fragmentary sectional view along the BB line of FIG. It is the figure which showed the lights L20a, L21a, L22a, L23a, and L24a from the LED light source 1a which advance in the cross section shown in FIG.

  FIG. 1 is a partial cross-sectional plan view of an LED lamp 100 according to the first embodiment. Specifically, the plan view portion in FIG. 1 shows the base 5 of the LED lamp 100, and the cross-sectional portion in FIG. 1 shows the LED lamp 100 including the central axis 2 ′ of the light guide lens 2. A schematic horizontal section is shown. FIG. 2 is a view showing the light guide lens 2 and the like constituting a part of the LED lamp 100 of the first embodiment. Specifically, FIG. 2A is a schematic horizontal sectional view of the light guide lens 2 including the central axis 2 ′ of the light guide lens 2. FIG. 2B is a diagram showing the light L0, L1, L2, and L3 from the LED light source 1 traveling in the horizontal section shown in FIG.

  In the LED lamp 100 of the first embodiment, as shown in FIG. 1, an LED light source 1, a light guide lens 2 that guides light from the LED light source 1, a substrate 3 on which the LED light source 1 is mounted, A housing 4 that supports the light guide lens 2 and the substrate 3 and a base 5 that supplies power to the LED light source 1 are provided. In the LED lamp 100 of the first embodiment, the base 5 is provided to supply power to the LED light source 1, but in the LED lamp 100 of the second embodiment, power is supplied to the LED light source 1 instead. Therefore, it is also possible to provide a wedge base portion.

  Further, in the LED lamp 100 of the first embodiment, as shown in FIG. 2A, an incident surface 2a on which light from the LED light source 1 is incident and an inner reflection surface that guides light from the LED light source 1 The light guide lens 2 is provided with 2b and the outer reflection surface 2c, and emission surfaces 2d and 2h from which light guided by the light guide lens 2 is emitted.

  Specifically, in the LED lamp 100 of the first embodiment, as shown in FIG. 2A, the tangent line L2b1a passing through one end point 2b1a is parallel to the central axis 2 ′ of the light guide lens 2, and the other The tangent line L2b1b passing through the end point 2b1b is perpendicular to the central axis 2 ′ of the light guide lens 2, and one end point 2b1a is located closer to the central axis 2 ′ of the light guide lens 2 than the other end point 2b1b. The inner reflection surface 2b is formed by rotating the quarter arc 2b1 arranged in this manner around the central axis 2 ′ of the light guide lens 2.

  Furthermore, in the LED lamp 100 of the first embodiment, as shown in FIG. 2A, the tangent line L2c1a passing through one end point 2c1a is parallel to the central axis 2 ′ of the light guide lens 2, and the other end point 2c1b. So that the tangent line L2c1b passing through is perpendicular to the central axis 2 ′ of the light guide lens 2, and one end point 2c1a is located closer to the central axis 2 ′ of the light guide lens 2 than the other end point 2c1b. The outer reflection surface 2c is formed by rotating the arranged quarter arc 2c1 around the central axis 2 ′ of the light guide lens 2.

  In the LED lamp 100 of the first embodiment, as shown in FIG. 2A, the center point C2c1 of the quarter arc 2c1 of the outer reflective surface 2c is a quarter arc of the inner reflective surface 2b. It is arranged on the side farther from the incident surface 2a than the center point C2b1 of 2b1 (the lower side in FIG. 2A) and closer to the central axis 2 ′ of the light guide lens 2.

  Furthermore, in the LED lamp 100 of the first embodiment, as shown in FIG. 2A, the arc light source is rotated around the central axis 2 ′ of the light guide lens 2 to thereby turn the LED light source 1 side (FIG. 2). A convex incident surface 2a is formed so as to protrude in (A) and the upper side of FIG. 2 (B). Further, a straight line 2e2 parallel to the central axis 2 'of the light guide lens 2 connecting the outer edge 2a1 of the incident surface 2a and one end point 2c1a of the quarter arc 2c1 of the outer reflective surface 2c is provided on the light guide lens 2. The guide reflecting surface 2e is formed by rotating around the central axis 2 ′. Further, a straight line or a curve connecting one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b and the central axis 2 ′ of the light guide lens 2 is rotated around the central axis 2 ′ of the light guide lens 2. Thus, an emission surface 2h is formed.

  Further, in the LED lamp 100 of the first embodiment, as shown in FIG. 2A, a conical surface having the central axis 2 ′ of the light guide lens 2 as the center, the inner reflecting surface 2b and the outer reflecting surface. An exit surface 2d is formed by a part of a conical surface that is tapered on the side opposite to the entrance surface 2a (the lower side in FIG. 2A) across 2c. Further, a straight line perpendicular to the central axis 2 ′ of the light guide lens 2 connecting the exit surface 2d and the other end 2b1b of the quarter arc 2b1 of the inner reflection surface 2b is defined as the central axis 2 ′ of the light guide lens 2. The guide reflecting surface 2f is formed by rotating it to the center. Also, a straight line perpendicular to the central axis 2 ′ of the light guide lens 2 connecting the exit surface 2d and the other end 2c1b of the quarter arc 2c1 of the outer reflective surface 2c is defined as the central axis 2 ′ of the light guide lens 2. The guide reflecting surface 2g is formed by rotating it to the center.

  Specifically, in the LED lamp 100 of the first embodiment, as shown in FIG. 2B, the light L0 emitted from the LED light source 1 onto the central axis 2 ′ of the light guide lens 2 is converted into the light guide lens. 2 is transmitted through the light incident surface 2 a and becomes light L 0 traveling on the central axis 2 ′ of the light guide lens 2 and enters the light incident surface 2 a of the light guide lens 2. Next, the light L 0 from the incident surface 2 a of the light guide lens 2 travels on the central axis 2 ′ of the light guide lens 2, is transmitted through the exit surface 2 h of the light guide lens 2, and the central axis 2 of the light guide lens 2. The light L0 forms a small angle with '(in the example shown in FIG. 2B, the light L0 travels on the central axis 2' of the light guide lens 2 in detail), and is emitted from the light guide lens 2. The light exits from the surface 2h.

  Furthermore, in the LED lamp 100 of the first embodiment, as shown in FIG. 2B, the light emitted from the LED light source 1 at an angle larger than the central axis 2 ′ of the light guide lens 2 and the light L0. L1 is refracted by the incident surface 2a of the light guide lens 2, becomes light L1 substantially parallel to the central axis 2 ′ of the light guide lens 2, and enters from the incident surface 2a of the light guide lens 2, and then guides the light. The light is transmitted between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The light is reflected four times by the inner reflection surface 2 b of the light guide lens 2. That is, the light passes through between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The squeezed light L1 is guided through the curved light guide path between the inner reflection surface 2b and the outer reflection surface 2c of the light guide lens 2 as if it were guided by an optical fiber. As a result, between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The transmitted light L1 becomes light L1 that travels in a desired direction, such as light that travels away from the central axis 2 ′ of the light guide lens 2, for example. Next, the light passes through between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The damped light L1 is refracted by the exit surface 2d of the light guide lens 2 and is away from the central axis 2 ′ of the light guide lens 2 and on the LED light source 1 side (upper side in FIG. 2B). Is emitted from the light exit surface 2 d of the light guide lens 2.

  In the LED lamp 100 of the first embodiment, as shown in FIG. 2B, the light emitted from the LED light source 1 at an angle larger than the central axis 2 ′ of the light guide lens 2 and the light L1. L2 is refracted by the incident surface 2a of the light guide lens 2, becomes light L2 substantially parallel to the central axis 2 'of the light guide lens 2, and enters from the incident surface 2a of the light guide lens 2, and then guides the light. The light is transmitted between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The light is reflected twice by the inner reflection surface 2 b of the light guide lens 2. That is, the light passes through between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The squeezed light L2 is guided through the curved light guide path between the inner reflection surface 2b and the outer reflection surface 2c of the light guide lens 2 as if it were guided by an optical fiber. As a result, between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The transmitted light L2 becomes light L2 that travels in a desired direction, such as light that travels away from the central axis 2 ′ of the light guide lens 2, for example. Next, the light passes through between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The damped light L2 is refracted by the exit surface 2d of the light guide lens 2 and is away from the central axis 2 ′ of the light guide lens 2 and on the LED light source 1 side (upper side in FIG. 2B). The light L <b> 2 that travels to the light is emitted from the light exit surface 2 d of the light guide lens 2.

  Furthermore, in the LED lamp 100 of the first embodiment, as shown in FIG. 2B, the light emitted from the LED light source 1 at an angle larger than the central axis 2 ′ of the light guide lens 2 and the light L2. L3 is refracted by the incident surface 2a of the light guide lens 2, becomes light L3 substantially parallel to the central axis 2 ′ of the light guide lens 2, and enters from the incident surface 2a of the light guide lens 2, and then guides the light. The light is transmitted between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The light is reflected twice by the inner reflection surface 2 b of the light guide lens 2. That is, the light passes through between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The squeezed light L3 is guided through the curved light guide path between the inner reflection surface 2b and the outer reflection surface 2c of the light guide lens 2 as if it were guided by an optical fiber. As a result, between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The transmitted light L3 becomes light L3 that travels in a desired direction, such as light that travels away from the central axis 2 ′ of the light guide lens 2, for example. Next, the light passes through between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The damped light L3 is refracted by the exit surface 2d of the light guide lens 2 and is away from the central axis 2 ′ of the light guide lens 2 and on the LED light source 1 side (upper side in FIG. 2B). The light L <b> 3 that travels to the light is emitted from the light exit surface 2 d of the light guide lens 2.

  As a result, in the LED lamp 100 of the first embodiment, as shown in FIG. 2B, most of the light L1, L2, L3 emitted from the emission surface 2d of the light guide lens 2 is, for example, the light guide lens. The light travels in a desired direction, such as the light traveling on the side of the LED light source 1 (the upper side in FIG. 2B), which is away from the central axis 2 ′ of FIG.

  That is, according to the LED lamp 100 of the first embodiment, as shown in FIG. 2B, most of the light transmitted between the inner reflection surface 2b and the outer reflection surface 2c of the light guide lens 2 is transmitted. L1, L2, and L3 can be changed to light L1, L2, and L3 that travel in a desired direction by the same light guide action as that of the optical fiber. Therefore, according to the LED lamp 100 of the first embodiment, among the light from the LED light source, only the light that can be transmitted through the focal point of the rotating hyperbolic reflecting surface can be converted into light that travels in a desired direction. The ratio of light traveling in a desired direction can be increased as compared with the LED lamp described in FIG.

  FIG. 3 is a view showing an example in which the LED lamp 100 according to the first embodiment is applied to a vehicular lamp 200. Specifically, FIG. 3 is a schematic horizontal sectional view of a vehicular lamp 200 to which the LED lamp 100 of the first embodiment is applied. In the vehicular lamp 200 shown in FIG. 3, the pseudo focus 100 a of the light emitted through the emission surface 2 d of the light guide lens 2 of the LED lamp 100 of the first embodiment shown in FIG. It is disposed on or near the focal point 200a1 of the reflecting surface 201a.

  Specifically, the present inventor, in earnest research, has a filament of a bulb-type lamp on or near the focal point 200a1 (see FIG. 3) of the parabolic reflecting surface 201a (see FIG. 3) of the reflector 201 (see FIG. 3). Was changed, and the light-emitting characteristics were examined by replacing the vehicular lamp 200 with the LED lamp 100 of the first embodiment. As a result, the vehicle lamp 200 to which the LED lamp 100 of the first embodiment was applied could also satisfy the stop lamp light distribution standard.

  Furthermore, the present inventor has arranged a bulb-type lamp filament on or near the focal point 200a1 (see FIG. 3) of the parabolic reflecting surface 201a (see FIG. 3) of the reflector 201 (see FIG. 3). Then, the vehicle lamp 200 satisfying the light distribution standard of the tail lamp was changed to replace the light bulb type lamp with the LED lamp 100 of the first embodiment, and the light distribution characteristics were examined. As a result, even the vehicular lamp 200 to which the LED lamp 100 of the first embodiment was applied was able to satisfy the light distribution standard of the tail lamp.

  Hereinafter, a third embodiment of the LED lamp of the present invention will be described. The LED lamp of the third embodiment is configured in substantially the same manner as the LED lamp 100 of the first embodiment described above, except for the points described below. Therefore, according to the LED lamp of the third embodiment, substantially the same effects as those of the LED lamp 100 of the first embodiment described above can be obtained except for the points described below.

  FIG. 4 is a partial cross-sectional plan view of the LED lamp 100 of the third embodiment. Specifically, the plan view portion in FIG. 4 shows the base 5 of the LED lamp 100, and the cross-sectional portion in FIG. 4 shows the LED lamp 100 including the central axis 2 ′ of the light guide lens 2. A schematic horizontal section is shown. FIG. 5 is a view showing the light guide lens 2 and the like constituting a part of the LED lamp 100 of the third embodiment. Specifically, FIG. 5 is a diagram showing light L10, L11, L12, and L13 from the LED light source 1 traveling in a schematic horizontal section of the light guide lens 2 including the central axis 2 ′ of the light guide lens 2. .

  In the LED lamp 100 of the first embodiment, as shown in FIG. 2 (A), by rotating the arc around the central axis 2 ′ of the light guide lens 2, the LED light source 1 side (FIG. 2 (A) ), A convex incident surface 2a protruding to the upper side) is formed. In the LED lamp 100 of the third embodiment, instead, as shown in FIG. 4, the central axis 2 ′ of the light guide lens 2 is formed. The incident surface 2a is formed by a plane perpendicular to the surface.

  Further, in the LED lamp 100 of the first embodiment, as shown in FIG. 2B, the light L1, L2, L3 from the LED light source 1 that forms an angle with the central axis 2 ′ of the light guide lens 2 is guided. The light L1, L2, L3 from the LED light source 1 is refracted by the incident surface 2a of the light guide lens 2 so as to be light L1, L2, L3 substantially parallel to the central axis 2 ′ of the lens 2. In the LED lamp 100 of the embodiment, instead, as shown in FIG. 5, the light L11, L12, L13 from the LED light source 1 that forms an angle with the central axis 2 ′ of the light guide lens 2 is centered on the light guide lens 2. A light guide lens 6 is provided for making light L11, L12, L13 substantially parallel to the axis 2 ′.

  Further, in the LED lamp 100 of the first embodiment, as shown in FIG. 2A, the outer edge 2a1 of the incident surface 2a and one end point 2c1a of the quarter arc 2c1 of the outer reflecting surface 2c are connected. The guide reflecting surface 2e is formed by rotating a straight line 2e2 parallel to the central axis 2 'of the light guide lens 2 around the central axis 2' of the light guide lens 2, but the LED of the third embodiment In the lamp 100, instead, as shown in FIG. 4, a curved line 2e1 connecting the outer edge 2a1 of the incident surface 2a and one end point 2c1a of the quarter arc 2c1 of the outer reflecting surface 2c is provided on the light guide lens 2. The guide reflecting surface 2e is formed by rotating around the central axis 2 ′.

  Specifically, in the LED lamp 100 of the third embodiment, as shown in FIG. 5, the light L <b> 10 irradiated from the LED light source 1 onto the central axis 2 ′ of the light guide lens 2 passes through the light guide lens 6. The light L10 is transmitted and travels on the central axis 2 ′ of the light guide lens 2, and enters the light incident surface 2a of the light guide lens 2. Next, the light L10 from the incident surface 2a of the light guide lens 2 travels on the central axis 2 ′ of the light guide lens 2 and is transmitted through the exit surface 2h of the light guide lens 2, so that the central axis 2 of the light guide lens 2 is transmitted. From the exit surface 2h of the light guide lens 2 (in the example shown in FIG. 5, it is the light L10 traveling on the central axis 2 ′ of the light guide lens 2). Exit.

  Furthermore, in the LED lamp 100 of the third embodiment, as shown in FIG. 5, the light L11 emitted from the LED light source 1 at an angle larger than the central axis 2 ′ of the light guide lens 2 and the light L10, The light L1 is transmitted through the light guide lens 6 and becomes parallel to the central axis 2 ′ of the light guide lens 2 and enters the light incident surface 2a of the light guide lens 2. Next, the light is reflected on the inner reflection surface 2b of the light guide lens 2. The light is transmitted between one end point 2b1a of the quarter arc 2b1 and one end point 2c1a of the quarter arc 2c1 of the outer reflective surface 2c of the light guide lens 2, and then the inner reflection of the light guide lens 2 Reflected four times by the surface 2b. That is, the light passes through between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The squeezed light L11 is guided through the curved light guide path between the inner reflective surface 2b and the outer reflective surface 2c of the light guide lens 2 as if it were guided by an optical fiber. As a result, between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The transmitted light L11 becomes light L11 that travels in a desired direction, such as light that travels away from the central axis 2 ′ of the light guide lens 2, for example. Next, the light passes through between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The light L11 thus damped is refracted by the light exit surface 2d of the light guide lens 2 and travels away from the central axis 2 ′ of the light guide lens 2 toward the LED light source 1 (upper side in FIG. 5). L11 is emitted from the exit surface 2d of the light guide lens 2.

  Further, in the LED lamp 100 of the third embodiment, as shown in FIG. 5, the light L12 emitted from the LED light source 1 at an angle larger than the central axis 2 ′ of the light guide lens 2 and the light L11, The light L is transmitted through the light guide lens 6 and becomes parallel to the central axis 2 ′ of the light guide lens 2 and enters the light incident surface 2 a of the light guide lens 2. The light is transmitted between one end point 2b1a of the quarter arc 2b1 and one end point 2c1a of the quarter arc 2c1 of the outer reflective surface 2c of the light guide lens 2, and then the inner reflection of the light guide lens 2 Reflected twice by the surface 2b. That is, the light passes through between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The squeezed light L12 is guided through the curved light guide path between the inner reflection surface 2b and the outer reflection surface 2c of the light guide lens 2 as if it were guided by an optical fiber. As a result, between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The transmitted light L12 becomes light L12 that travels in a desired direction, such as light that travels away from the central axis 2 ′ of the light guide lens 2, for example. Next, the light passes through between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The light L12 thus refracted is refracted by the light exit surface 2d of the light guide lens 2 and travels to the LED light source 1 side (upper side in FIG. 5) on the side away from the central axis 2 ′ of the light guide lens 2. It becomes L12 and is emitted from the exit surface 2d of the light guide lens 2.

  Furthermore, in the LED lamp 100 of the third embodiment, as shown in FIG. 5, the light L13 emitted from the LED light source 1 at an angle larger than the central axis 2 ′ of the light guide lens 2 and the light L12, The light is transmitted through the light guide lens 6 and becomes light L12 parallel to the central axis 2 ′ of the light guide lens 2 and enters from the incident surface 2a of the light guide lens 2. Then, the light is reflected by the guide reflection surface 2e of the light guide lens 2. Reflected and then one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2 The light is allowed to pass through, and then reflected twice by the inner reflection surface 2 b of the light guide lens 2. That is, the light passes through between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The squeezed light L13 is guided through the curved light guide path between the inner reflection surface 2b and the outer reflection surface 2c of the light guide lens 2 as if it were guided by an optical fiber. As a result, between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The transmitted light L13 becomes light L13 that travels in a desired direction, such as light that travels away from the central axis 2 ′ of the light guide lens 2. Next, the light passes through between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The light L13 thus refracted is refracted by the light exit surface 2d of the light guide lens 2 and travels away from the central axis 2 ′ of the light guide lens 2 toward the LED light source 1 (upper side in FIG. 5). L13 is emitted from the exit surface 2d of the light guide lens 2.

  As a result, in the LED lamp 100 of the third embodiment, most of the light L11, L12, L13 emitted from the emission surface 2d of the light guide lens 2 is, for example, the center of the light guide lens 2 as shown in FIG. The light travels in a desired direction, such as light traveling away from the axis 2 ′ and traveling toward the LED light source 1 (upper side in FIG. 5).

  That is, according to the LED lamp 100 of the third embodiment, as shown in FIG. 5, most of the light L11 and L12 that can be transmitted between the inner reflecting surface 2b and the outer reflecting surface 2c of the light guide lens 2. , L13 can be changed to light L11, L12, L13 traveling in a desired direction by the same light guide action as that of the optical fiber. Therefore, according to the LED lamp 100 of the third embodiment, among the light from the LED light source, only the light that can be transmitted through the focal point of the rotating hyperbolic reflecting surface can be converted into light that travels in a desired direction. The ratio of light traveling in a desired direction can be increased as compared with the LED lamp described in FIG.

  Further, in the LED lamp 100 of the third embodiment, as shown in FIG. 5, the light L13 from the LED light source 1 incident through the incident surface 2a of the light guide lens 2 is totally reflected, and the light guide lens 2 is reflected. Guide reflection for guiding light between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the lens and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2 The surface 2e is disposed between one end point 2c1a of the quarter arc 2c1 of the outer reflecting surface 2c and the outer edge 2a1 of the incident surface 2a. Therefore, according to the LED lamp 100 of the third embodiment, the incident light is incident through the incident surface 2a of the light guide lens 2, and of the surface of the light guide lens 2, the quarter arc 2c1 of the outer reflective surface 2c. The light L13 from the LED light source 1 that has reached the portion between the one end point 2c1a and the outer edge 2a1 of the incident surface 2a is one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2. And the effective utilization rate of the light from the LED light source 1 can be improved as compared with the case where the light is not guided between the one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2.

  Hereinafter, a fourth embodiment of the LED lamp of the present invention will be described. The LED lamp of the fourth embodiment is configured in substantially the same manner as the LED lamp 100 of the first embodiment described above, except for the points described below. Therefore, according to the LED lamp of the fourth embodiment, substantially the same effects as those of the LED lamp 100 of the first embodiment described above can be obtained except for the points described below.

  FIG. 6 is a front view of the LED lamp 100 of the fourth embodiment. 7 is a partial cross-sectional view taken along line AA in FIG. 6, and FIG. 8 is a partial cross-sectional view taken along line BB in FIG. FIG. 9 is a diagram showing light L20a, L21a, L22a, L23a, and L24a from the LED light source 1a traveling in the cross section shown in FIG.

  In the LED lamp 100 of the first embodiment, as shown in FIG. 1, one LED light source 1 is provided, but in the LED lamp 100 of the fourth embodiment, instead, FIGS. 7 and 8. As shown, three LED light sources 1a, 1b, and 1c are provided. Specifically, in the LED lamp 100 of the fourth embodiment, three LED light sources 1a, 1b, and 1c are arranged at 120 ° intervals on the same circle with the central axis 2 ′ of the light guide lens 2 as the center. Yes.

  Further, in the LED lamp 100 of the first embodiment, as shown in FIG. 2A, by rotating the arc around the central axis 2 ′ of the light guide lens 2, the LED light source 1 side (FIG. 2). Although the convex incident surface 2a which protrudes (upper side of (A)) is formed, in the LED lamp 100 of 4th Embodiment, as shown to FIG. 7 and FIG. The incident surface 2a is formed by a conical surface having a vertex on the LED light source 1a, 1b, 1c side (upper side in FIGS. 7 and 8) obtained by rotating a straight line around the central axis 2 ′.

  Further, in the LED lamp 100 of the first embodiment, as shown in FIG. 2B, the light L1, L2, L3 from the LED light source 1 that forms an angle with the central axis 2 ′ of the light guide lens 2 is guided. The light L1, L2, L3 from the LED light source 1 is refracted by the incident surface 2a of the light guide lens 2 so that the light L1, L2, L3 is substantially parallel to the central axis 2 ′ of the lens 2; In the LED lamp 100 of the embodiment, instead, as shown in FIG. 9, the light L20a, L21a, L22a, L23a, L24a from the LED light source 1a is light L20a substantially parallel to the central axis 2 ′ of the light guide lens 2. , L21a, L22a, L23a, and L24a are provided with a light guide lens 6 having a light guide portion 6a. Furthermore, the light guide 6b (see FIG. 7) for turning light (not shown) from the LED light source 1b (see FIG. 7) into light (not shown) substantially parallel to the central axis 2 ′ of the light guide lens 2 ) Is provided on the light guide lens 6 (see FIG. 7). Further, a light guide 6c (see FIG. 8) for converting light (not shown) from the LED light source 1c (see FIG. 8) into light (not shown) substantially parallel to the central axis 2 ′ of the light guide lens 2. ) Is provided on the light guide lens 6 (see FIG. 8). That is, in the LED lamp 100 of the fourth embodiment, the light guide 6a, the light guide 6b, and the light guide 6c of the light guide lens 6 are rotated by 120 ° about the central axis 2 ′ of the light guide lens 2. It is formed symmetrically.

  Further, in the LED lamp 100 of the first embodiment, as shown in FIG. 2A, the outer edge 2a1 of the incident surface 2a and one end point 2c1a of the quarter arc 2c1 of the outer reflecting surface 2c are connected. The guide reflecting surface 2e is formed by rotating a straight line 2e2 parallel to the central axis 2 'of the light guide lens 2 around the central axis 2' of the light guide lens 2, but the LED of the fourth embodiment In the lamp 100, instead, as shown in FIGS. 7 and 8, a straight line and a curve 2e1 connecting the outer edge portion 2a1 of the incident surface 2a and one end point 2c1a of the quarter arc 2c1 of the outer reflecting surface 2c, A guide reflection surface 2e is formed by rotating the light guide lens 2 around the central axis 2 ′.

  Specifically, in the LED lamp 100 of the fourth embodiment, as shown in FIG. 9, the light L20a emitted from the LED light source 1a is transmitted through the light guide lens 6, and the central axis 2 of the light guide lens 2 is obtained. It becomes the light L20a parallel to 'and enters the incident surface 2a of the light guide lens 2. Next, the light L20a refracted by the incident surface 2a of the light guide lens 2 is transmitted through the exit surface 2h of the light guide lens 2, and becomes light L20a having a small angle with the central axis 2 ′ of the light guide lens 2. In detail, in the example shown in FIG. 9, the light is emitted from the emission surface 2 h of the light guide lens 2 as light L20 a parallel to the central axis 2 ′ of the light guide lens 2.

  Furthermore, in the LED lamp 100 of the fourth embodiment, as shown in FIG. 9, the light L <b> 21 a emitted from the LED light source 1 a is transmitted through the light guide lens 6 and is centered on the central axis 2 ′ of the light guide lens 2. The parallel light L21a is incident on the incident surface 2a of the light guide lens 2, and then refracted by the incident surface 2a of the light guide lens 2, and a quarter arc 2b1 of the inner reflective surface 2b of the light guide lens 2 is obtained. Is transmitted between the one end point 2b1a of the light guide lens 2 and the one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2, and then reflected six times by the inner reflection surface 2b of the light guide lens 2. Is done. That is, the light passes through between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The squeezed light L21a is guided through the curved light guide path between the inner reflective surface 2b and the outer reflective surface 2c of the light guide lens 2 as if guided by an optical fiber. As a result, between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The transmitted light L21a becomes light L21a that travels in a desired direction, such as light that travels away from the central axis 2 ′ of the light guide lens 2. Next, the light passes through between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The damped light L21a is reflected by the guide reflecting surface 2f of the light guide lens 2, is refracted by the exit surface 2d of the light guide lens 2, and is away from the central axis 2 ′ of the light guide lens 2, The light L21a traveling toward the light source 1a (upper side in FIG. 9) exits from the exit surface 2d of the light guide lens 2.

  Further, in the LED lamp 100 of the fourth embodiment, as shown in FIG. 9, the light L22a emitted from the LED light source 1a is transmitted through the light guide lens 6 and is centered on the central axis 2 ′ of the light guide lens 2. It becomes parallel light L22a and enters the incident surface 2a of the light guide lens 2, and is then refracted by the incident surface 2a of the light guide lens 2, and a quarter arc 2b1 of the inner reflective surface 2b of the light guide lens 2 Between the one end point 2b1a of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflective surface 2c of the light guide lens 2, and then reflected twice by the inner reflective surface 2b of the light guide lens 2 Is done. That is, the light passes through between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The squeezed light L22a is guided through the curved light guide path between the inner reflective surface 2b and the outer reflective surface 2c of the light guide lens 2 as if guided by an optical fiber. As a result, between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The transmitted light L22a becomes light L22a that travels in a desired direction, such as light that travels away from the central axis 2 ′ of the light guide lens 2. Next, the light passes through between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The damped light L22a is reflected by the guide reflecting surface 2f of the light guide lens 2, is refracted by the exit surface 2d of the light guide lens 2, and is on the side away from the central axis 2 ′ of the light guide lens 2. The light L22a traveling toward the light source 1a (upper side in FIG. 9) is emitted from the exit surface 2d of the light guide lens 2.

  Furthermore, in the LED lamp 100 of the fourth embodiment, as shown in FIG. 9, the light L23a emitted from the LED light source 1a is transmitted through the light guide lens 6, and is centered on the central axis 2 ′ of the light guide lens 2. It becomes parallel light L23a, enters the incident surface 2a of the light guide lens 2, and is then refracted by the incident surface 2a of the light guide lens 2, and a quarter arc 2b1 of the inner reflective surface 2b of the light guide lens 2 Between the one end point 2b1a of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflective surface 2c of the light guide lens 2, and then reflected twice by the inner reflective surface 2b of the light guide lens 2 Is done. That is, the light passes through between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The squeezed light L23a is guided through the curved light guide path between the inner reflective surface 2b and the outer reflective surface 2c of the light guide lens 2 as if guided by an optical fiber. As a result, between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The transmitted light L23a becomes light L23a that travels in a desired direction, such as light that travels away from the central axis 2 ′ of the light guide lens 2. Next, the light passes through between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The light L23a thus refracted is refracted by the exit surface 2d of the light guide lens 2 and travels to the LED light source 1a side (upper side in FIG. 9) on the side away from the central axis 2 ′ of the light guide lens 2. L23a is emitted from the light exit surface 2d of the light guide lens 2.

  Further, in the LED lamp 100 of the fourth embodiment, as shown in FIG. 9, the light L24a emitted from the LED light source 1a is transmitted through the light guide lens 6 and is centered on the central axis 2 ′ of the light guide lens 2. It becomes parallel light L24a and enters the incident surface 2a of the light guide lens 2, and then is refracted by the incident surface 2a of the light guide lens 2, and then reflected by the guide reflecting surface 2e of the light guide lens 2, and then The light is transmitted between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. Then, the light is reflected seven times by the inner reflection surface 2b and the outer reflection surface 2c of the light guide lens 2. That is, the light passes through between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The caulked light L24a is guided through the curved light guide path between the inner reflecting surface 2b and the outer reflecting surface 2c of the light guide lens 2 as if it were guided by an optical fiber. As a result, between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The transmitted light L24a becomes light L24a that travels in a desired direction, such as light that travels away from the central axis 2 ′ of the light guide lens 2, for example. Next, the light passes through between the other end point 2b1b of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2 and the other end point 2c1b of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2. The damped light L24a is refracted by the exit surface 2d of the light guide lens 2 and is away from the central axis 2 ′ of the light guide lens 2 and on the opposite side of the LED light source 1a (lower side in FIG. 9). The light L24a travels and exits from the exit surface 2d of the light guide lens 2.

  As a result, in the LED lamp 100 of the fourth embodiment, as shown in FIG. 9, most of the light L21a, L22a, L23a emitted from the emission surface 2d of the light guide lens 2 is, for example, the center of the light guide lens 2. The light travels in a desired direction, such as light traveling away from the axis 2 ′ and traveling toward the LED light source 1a (upper side in FIG. 9).

  That is, according to the LED lamp 100 of the fourth embodiment, as shown in FIG. 9, most of the light L21a and L22a that are transmitted between the inner reflecting surface 2b and the outer reflecting surface 2c of the light guide lens 2 are used. , L23a can be changed to light L21a, L22a, L23a traveling in a desired direction by the same light guide action as that of the optical fiber. Therefore, according to the LED lamp 100 of the fourth embodiment, among the light from the LED light source, only the light that can be transmitted through the focal point of the rotating hyperbolic reflecting surface can be converted into light that travels in a desired direction. The ratio of light traveling in a desired direction can be increased as compared with the LED lamp described in FIG.

  Furthermore, in the LED lamp 100 of the fourth embodiment, as shown in FIG. 9, the light L24a from the LED light source 1a incident through the incident surface 2a of the light guide lens 2 is totally reflected, and the light guide lens 2 is reflected. Guide reflection for guiding light between one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the lens and one end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2 The surface 2e is disposed between one end point 2c1a of the quarter arc 2c1 of the outer reflecting surface 2c and the outer edge 2a1 of the incident surface 2a. Therefore, according to the LED lamp 100 of the fourth embodiment, the incident light is incident through the incident surface 2a of the light guide lens 2, and of the surface of the light guide lens 2, the quarter arc 2c1 of the outer reflective surface 2c. The light L24a from the LED light source 1a that has reached the portion between the one end point 2c1a and the outer edge 2a1 of the incident surface 2a is one end point 2b1a of the quarter arc 2b1 of the inner reflection surface 2b of the light guide lens 2. The effective utilization rate of the light from the LED light source 1a can be improved as compared with the case where the light is not guided between the end point 2c1a of the quarter arc 2c1 of the outer reflection surface 2c of the light guide lens 2.

  In the fifth embodiment, the above-described first to fourth embodiments can be appropriately combined.

  The LED lamp of the present invention can be applied to any vehicle lamp such as a stop lamp and a tail lamp, a general lighting device, and a street lamp.

1, 1a, 1b, 1c LED light source 2 Light guide lens 2 ′ Center axis 2a Incident surface 2b Inner reflecting surface 2b1 Quarter arc 2b1a, 2b1b End point 2c Outer reflecting surface 2c1 Quarter arc 2c1a, 2c1b End point 2d Outgoing Surface 100 LED lamp L2b1a, L2b1b Tangent line L2c1a, L2c1b Tangent line C2b1, C2c1 Center point

Claims (3)

An LED light source (1; 1a, 1b, 1c) and a light guide lens (2) for guiding light from the LED light source (1; 1a, 1b, 1c);
An incident surface (2a), an inner reflection surface (2b), an outer reflection surface (2c), and an emission surface (2d) are provided on the light guide lens (2),
A tangent line (L2b1a) passing through one end point (2b1a) is parallel to the central axis (2 ′) of the light guide lens (2), and a tangent line (L2b1b) passing through the other end point (2b1b) is the light guide lens (2). So that one end point (2b1a) is positioned closer to the central axis (2 ') of the light guide lens (2) than the other end point (2b1b). The inner arc surface (2b) is formed by rotating the quarter arc (2b1) arranged at the center of the central axis (2 ′) of the light guide lens (2),
A tangent line (L2c1a) passing through one end point (2c1a) is parallel to the central axis (2 ′) of the light guide lens (2), and a tangent line (L2c1b) passing through the other end point (2c1b) is the light guide lens (2). So that one end point (2c1a) is positioned closer to the center axis (2 ') of the light guide lens (2) than the other end point (2c1b). The outer arc surface (2c) is formed by rotating the quarter arc (2c1) arranged on the center axis (2 ′) of the light guide lens (2),
The center point (C2c1) of the quarter arc (2c1) of the outer reflective surface (2c) is made more incident than the center point (C2b1) of the quarter arc (2b1) of the inner reflective surface (2b) ( 2a) on the side away from the central axis (2 ′) of the light guide lens (2),
The light from the LED light source (1; 1a, 1b, 1c) incident through the incident surface (2a) of the light guide lens (2) is divided into four minutes on the inner reflection surface (2b) of the light guide lens (2). Is transmitted between one end point (2b1a) of one arc (2b1) and one end point (2c1a) of a quarter arc (2c1) of the outer reflective surface (2c) of the light guide lens (2). The other end point (2b1b) of the quarter arc (2b1) of the inner reflection surface (2b) of the light guide lens (2) is reflected a plurality of times by the inner reflection surface (2b) of the light guide lens (2). The light is transmitted through the quarter end (2c1b) of the quarter arc (2c1) of the outer reflective surface (2c) of the light guide lens (2), and the light exiting surface (2d) of the light guide lens (2) is transmitted. LED lamp (100) characterized by emitting through the LED.   The light from the LED light source (1; 1a, 1b, 1c) incident through the incident surface (2a) of the light guide lens (2) is totally reflected, and the inner reflective surface (2b) of the light guide lens (2). Between one end point (2b1a) of the ¼ arc (2b1) and one end point (2c1a) of the ¼ arc (2c1) of the outer reflective surface (2c) of the light guide lens (2). A guide reflecting surface (2e) for guiding light is placed between one end point (2c1a) of a quarter arc (2c1) of the outer reflecting surface (2c) and the outer edge (2a1) of the incident surface (2a). LED lamp (100) according to claim 1, characterized in that it is arranged.   The parabolic reflection surface of the reflector (201) is used as a pseudo focal point (100a) of light emitted through the emission surface (2d) of the light guide lens (2) of the LED lamp (100) according to claim 1 or 2. A vehicular lamp (200), which is disposed on or near the focal point (200a1) of (201a).

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