JP5152666B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp that is suitable for forming a light distribution pattern that satisfies a predetermined light distribution standard (for example, a light distribution standard for a fog lamp).

  2. Description of the Related Art Conventionally, a vehicular lamp is known in which light emitted from a light source is reflected by a plurality of lattice cuts formed on a reflector and diffused vertically and horizontally to form a predetermined light distribution pattern (see, for example, Patent Document 1).

  FIG. 6 is a perspective view for explaining the configuration of the vehicular lamp described in Patent Document 1. FIG. FIG. 7 is an example of a light distribution pattern for fog lamps formed on a vertical screen arranged at a predetermined position by the grid cut 221 having the arrangement shown in FIG. In FIG. 7, contour lines representing the light intensity distribution are drawn every 10 cd.

  As shown in FIG. 6, the vehicular lamp described in Patent Document 1 includes a light source 210, a reflector 220 in which a plurality of lattice cuts 221 (rectangular reflective surfaces partitioned in a lattice shape) are formed, an outer lens 230, An inner lens 240 having a polygonal prism is provided.

In the vehicle reflector 220 described in Patent Document 1, light emitted from the light source 210 is reflected by a plurality of lattice cuts 221, passes through the inner lens 240 and the outer lens 230, and is diffused in the vertical and horizontal directions. The predetermined light distribution pattern shown in FIG.
JP 2003-319304 A

  However, in the vehicular lamp described in Patent Document 1, since the reflecting surface of the reflector is a rectangular reflecting surface partitioned in a lattice shape, the predetermined light distribution pattern is rectangular as shown in FIG. . For this reason, in the vehicular lamp described in Patent Document 1, the light spreads to a range other than the range where a constant light intensity is required depending on the light distribution standard (for example, in the case of the light distribution standard for fog lamps, 7), the light spreads in the range indicated by the four triangles A2 ′ outside the rhombus A1 ′ shown in FIG.

  The present invention has been made in view of such circumstances, and the light spreads to a range other than the range where a certain light intensity is required by a predetermined light distribution standard (for example, in the case of a light distribution standard for fog lamps, The vehicle lamp capable of preventing or reducing the spread of light in the range indicated by the four triangles A2 ′ outside the rhombus A1 ′ shown in FIG. 7 and the deterioration of the luminous flux utilization rate (increasing loss). The purpose is to provide.

  In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a vehicular lamp including a light source and a reflecting surface that reflects light emitted from the light source and forms a predetermined light distribution pattern. The surface includes a plurality of cross-reflective surfaces, and each of the plurality of cross-reflective surfaces reflects light emitted from the light source and diffuses it vertically and horizontally to form a predetermined light distribution pattern. It is formed in the curved surface shape in which a curve appears on the surface.

  According to the first aspect of the present invention, since a plurality of cross-reflecting surfaces formed in a curved shape in which a curved line appears in a longitudinal section and a transverse section are used instead of a rectangular lattice cut, according to a predetermined light distribution standard. It is possible to prevent or reduce the spread of light to a range other than the range where a constant luminous intensity is required. For this reason, according to the first aspect of the present invention, it is possible to prevent or reduce the deterioration of the luminous flux utilization factor (the loss increases).

  In addition, since the conventional vehicle lamp uses a grid cut which is a rectangular reflecting surface partitioned into a grid, the light distribution is likely to gather at the center (see FIG. 7), on the HH line, V- There has been a problem that it is difficult to adjust the light intensity at the end on the V-line to the target light intensity.

  However, according to the first aspect of the present invention, since a plurality of cross-reflecting surfaces formed in curved shapes in which curved lines appear in the longitudinal section and the transverse section are used instead of the rectangular lattice cut, the conventional vehicle Compared with the lamp, the light distribution is less likely to collect at the center, and the light intensity at the ends on the HH line and the VV line can be easily adjusted to the target light intensity.

  According to a second aspect of the present invention, in the first aspect of the invention, the plurality of cross-reflective surfaces are arranged in rectangular spaces at the four corners of the cross-reflective surface, above, below, and on the left of the other adjacent cross-reflective surfaces. Or it arrange | positions in the state which located the right part.

  According to the second aspect of the present invention, the plurality of cross-reflecting surfaces are positioned in the rectangular space at the four corners of the cross-reflecting surface such that the upper, lower, left, or right portions of the other adjacent cross-reflecting surfaces are positioned. (That is, the cross-reflecting surfaces are combined and arranged without a gap), so that the efficiency of light distribution can be improved while reducing the lamp size (from the bulb center to the reflecting surface). Can be reduced to about 3/5 compared to conventional vehicle lamps having the same distance).

  Further, according to the invention described in claim 2, it is possible to provide a vehicular lamp having a new appearance in which a plurality of cross reflecting surfaces are combined without gaps.

  The invention according to claim 3 is the invention according to claim 1, wherein the plurality of cross-reflective surfaces are an upper portion, a lower portion, a left portion or a right portion of the cross-reflective surface and a lower portion of another adjacent cross-reflective surface. The upper part, the right part or the left part are arranged adjacent to each other.

  According to the third aspect of the present invention, it is possible to provide a vehicular lamp having a new appearance in which a plurality of cross-reflecting surfaces are combined.

  According to the present invention, the light spreads to a range other than the range where a certain luminous intensity is required by the predetermined light distribution standard (for example, in the case of the light distribution standard for fog lamps, the four outside the rhombus A1 ′ shown in FIG. 7). It is possible to prevent or reduce the spread of light in the range indicated by the two triangles A2 ′) and the deterioration of the luminous flux utilization rate (the loss increases).

  Hereinafter, a vehicular lamp that is an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of the vehicular lamp of the present embodiment cut along a horizontal cross section.

  A vehicular lamp 100 according to the present embodiment is applied to, for example, a rear fog lamp provided in a rear part of a vehicle such as an automobile. As shown in FIG. 1, a light source 10, a reflecting surface 20 formed on a reflector, a cover A lens 30 and the like are provided.

  The light source 10 is a light source such as an incandescent bulb or LED. When the light source 10 is an incandescent light bulb, as shown in FIG. The reflecting surface 20 is a reflecting surface (such as a rotating paraboloid surface or a flat surface) for reflecting light emitted from the light source 10 and forming a light distribution pattern for fog lamps. As shown in FIG. A cross-shaped cross-reflecting surface 21 is included.

  In order to form a light distribution pattern that meets the light distribution standard for fog lamps required by laws and regulations, the cross-reflecting surface 21 has a curved surface shape in which curved lines appear in the longitudinal section and the transverse section (FIG. 3 shows a predetermined curvature in the longitudinal section and the transverse section). Of the curved surface in which the arcs C1 and C2 appear. This curved surface shape can be determined, for example, by performing a simulation using an existing program. The cross-shaped reflective surface 21 formed in this way corresponds to a cross-shaped reflective surface by cutting out four corners of a rectangular-shaped reflective surface partitioned into a lattice shape described in JP-A-2003-319304. .

  As shown in FIG. 2A or 4, the cross-reflecting surface 21 has an upper space 21 </ b> T, a lower portion 21 </ b> Lo, a left-hand portion 21 </ b> L, or a right side in the rectangular space at the four corners of the cross-reflecting surface 21. It arrange | positions in the state which located the part 21R.

  As described above, the plurality of cross-reflecting surfaces 21 are positioned in the rectangular space at the four corners of the cross-reflecting surface 21 such that the upper portion 21T, the lower portion 21Lo, the left portion 21L, or the right portion 21R of the other adjacent cross-reflecting surfaces 21 are positioned. (That is, since the cross-reflecting surfaces 21 are combined and arranged without a gap), it is possible to increase the efficiency of light distribution while reducing the lamp size (from the bulb center to the reflecting surface). Can be downsized to about 3/5 compared to conventional vehicle lamps that have the same distance to each other). Note that the number and size of the cross-reflecting surfaces 21 can be set to an appropriate number and size in consideration of the light distribution standard and appearance of the fog lamp.

  When the arrangement of the cross-reflecting surface 21 is shown in FIG. 2A, the irradiation light from the light source 10 is reflected by the plurality of cross-reflecting surfaces 21, passes through the cover lens 30, is diffused vertically and horizontally, and is shown in FIG. ), A light distribution pattern satisfying the light distribution standard for fog lamps required by law is formed.

  FIG. 2B is an example of a light distribution pattern for fog lamps formed on a vertical screen arranged at a predetermined position by the cross-reflecting surface 21 arranged as shown in FIG. In FIG. 2B, contour lines representing the light intensity distribution are drawn every 10 cd.

  Referring to FIG. 2B, as compared with FIG. 7, the light does not spread outside the range of the rhombus A1, which requires a constant light intensity according to the light distribution standard for fog lamps, and the light distribution is less likely to gather at the center. It can be seen that the light intensity at the ends on the HH line and the VV line can be easily adjusted to the target light intensity.

  As described above, according to the vehicular lamp 100 of the present embodiment, a plurality of crosses formed in a curved shape in which arcs C1 and C2 having a predetermined curvature appear in the vertical and horizontal cross-sections instead of the rectangular lattice cut. Since the reflecting surface 21 is used, it is possible to prevent or reduce the light from spreading outside the rhombus A1, which requires a certain luminous intensity according to the light distribution standard for fog lamps. For this reason, according to the vehicular lamp 100 of the present embodiment, it is possible to prevent or reduce the deterioration of the luminous flux utilization rate (the loss increases). That is, according to the vehicular lamp 100 of the present embodiment, by using the plurality of cross-reflecting surfaces 21 arranged in FIG. 2A, a light distribution pattern more suitable for the light distribution standard for fog lamps (FIG. 2B). ))) Can be formed.

  Further, according to the vehicular lamp 100 of the present embodiment, the plurality of cross-reflecting surfaces 21 formed in a curved shape in which arcs C1 and C2 having a predetermined curvature appear in the vertical and horizontal cross-sections, instead of the rectangular grid cut. Since it is used, the light distribution is less likely to collect at the center than the conventional vehicle lamp (see FIG. 2B), and the light intensity at the ends on the HH line and the VV line can be easily set to the target light intensity. It becomes possible to adjust.

  Moreover, according to the vehicular lamp 100 of the present embodiment, it is possible to provide the vehicular lamp 100 having a new appearance in which a plurality of cross-reflecting surfaces 21 are combined without gaps.

  Next, a modified example will be described.

  In the above embodiment, as shown in FIG. 2A, the cross-reflecting surface 21 is arranged in the rectangular space at the four corners of the cross-reflecting surface 21 so that the upper part 21T, the lower part 21Lo, and the left part 21L Alternatively, the right portion 21R is disposed in the positioned state, but the present invention is not limited to this.

  For example, as shown in FIG. 5A, the cross-reflection surface 21 includes an upper portion 21T, a lower portion 21Lo, a left portion 21L or a right portion 21R of the cross-reflection surface 21, and a lower portion 21Lo and an upper portion of another adjacent cross-reflection surface. 21T, the right part 21R, or the left part 21L may be arranged adjacent to each other.

  5A, the irradiation light from the light source 10 is reflected by the plurality of cross reflection surfaces 21, passes through the cover lens 30, is diffused vertically and horizontally, and is diffused in FIG. 5B. ), A light distribution pattern satisfying the light distribution standard for fog lamps required by law is formed.

  FIG. 5B is an example of a light distribution pattern for fog lamps formed on a vertical screen arranged at a predetermined position by the cross-reflecting surface 21 arranged as shown in FIG. In FIG. 5B, contour lines representing the light intensity distribution are drawn every 20 cd.

  Referring to FIG. 5B, as compared with FIG. 7, the light does not spread outside the range of the rhombus A2, which requires a constant light intensity according to the light distribution standard for fog lamps, and the light distribution is less likely to gather at the center. It can be seen that the light intensity at the ends on the HH line and the VV line can be easily adjusted to the target light intensity.

  As described above, according to the present modification, a plurality of cross-reflecting surfaces 21 formed in a curved shape in which arcs C1 and C2 having predetermined curvatures appear in the longitudinal and transverse sections are used instead of the rectangular lattice cut. Therefore, it is possible to prevent or reduce the spread of light beyond the rhombus A2, which requires a constant luminous intensity according to the light distribution standard for fog lamps. For this reason, according to this modification, it becomes possible to prevent or reduce the deterioration of the luminous flux utilization factor (the loss increases). That is, according to this modification, a light distribution pattern (see FIG. 5B) more suitable for the fog lamp light distribution standard is formed by using the plurality of cross-reflecting surfaces 21 arranged in FIG. It becomes possible to do.

  In addition, according to the present modification, instead of the rectangular lattice cut, a plurality of cross-reflecting surfaces 21 formed in a curved shape in which arcs C1 and C2 having a predetermined curvature appear in the longitudinal section and the transverse section are used. Compared to conventional vehicle lamps, the light distribution is less likely to collect at the center (see FIG. 5B), and the light intensity at the ends on the HH line and the VV line can be easily adjusted to the target light intensity. It becomes.

  In addition, although the said embodiment and the modification demonstrated the example which formed the cross reflective surface 20 in the reflective surface 20 of a reflector, this invention is not limited to this. For example, a cross-shaped cross cut may be formed on the cover lens 30.

  Moreover, according to this modification, it is possible to provide a vehicular lamp 100 having a new appearance in which a plurality of cross reflecting surfaces 21 are combined.

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

It is sectional drawing which cut | disconnected the vehicle lamp of this embodiment in the horizontal cross section. (A) It is an example of arrangement | positioning of the cross reflective surface 21, (b) It is an example of the light distribution pattern for fog lamps formed on the vertical screen arrange | positioned in the predetermined position. 4 is a diagram for explaining a curved surface shape of a cross-reflecting surface 21. FIG. It is the example of arrangement | positioning (modification) of the cross reflective surface 21. (A) It is the example of arrangement | positioning (modification) of the cross reflective surface 21, (b) It is an example of the light distribution pattern for fog lamps formed on the vertical screen arrange | positioned in the predetermined position. It is a perspective view for demonstrating the structure of the vehicle lamp described in patent document 1. FIG. It is an example of the light distribution pattern for fog lamps formed on the vertical screen arranged at a predetermined position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Vehicle lamp, 10 ... Light source, 20 ... Reflecting surface, 21 ... Cross reflecting surface, 21L ... Left part, 21Lo ... Lower part, 21R ... Right part, 21T ... Upper part, 30 ... Cover lens

Claims (3)

In a vehicular lamp including a light source and a reflecting surface for reflecting light emitted from the light source and forming a predetermined light distribution pattern,
The reflective surface includes a plurality of cross reflective surfaces,
Each of the plurality of cross-reflecting surfaces is formed in a curved surface shape in which a curved line appears in a longitudinal section and a transverse section in order to reflect light emitted from the light source and diffuse the light in the vertical and horizontal directions to form a predetermined light distribution pattern. A vehicular lamp characterized by comprising:   The plurality of cross-reflective surfaces are arranged in a rectangular space at the four corners of the cross-reflective surface with the upper, lower, left, or right portions of other adjacent cross-reflective surfaces positioned. The vehicular lamp according to claim 1.   The plurality of cross-reflective surfaces are arranged such that the upper, lower, left or right part of the cross-reflective surface is adjacent to the lower, upper, right or left part of another adjacent cross-reflective surface. The vehicular lamp according to claim 1, wherein the vehicular lamp is provided.