JP2014235976A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular signal lamp device that has a light-emitting surface making plane emission excellent in uniformity and in which minute light-emitting points are scattered in the light-emitting surface.SOLUTION: A vehicular signal lamp device 1 includes a lamp housing 2, a lens cover 3, a light source unit 5, and a lens unit 6 that is provided between the light source unit 5 and the lens cover. The lens unit 6 is made of two inner lenses 61 and 62 comprising a cylindrical prism array 8 orthogonal to both surfaces. The cylindrical prism array 8 is made of a polyhedral prism lens element.

Description

  The present invention relates to a vehicular lamp that is attached to a vehicle body such as a motorcycle or an automobile, such as a rear combination lamp, a lid lamp, a high-mount stop lamp, a door mirror, or the like provided at the rear of the vehicle. The present invention relates to a vehicular signal lamp such as a side turn lamp provided, a position lamp provided in front of the vehicle, and an indoor lamp provided in the vehicle.

  As a conventional vehicular lamp, a vehicular lamp using an LED (light emitting diode) as a light source has been put into practical use. When an LED is used as a light source, the irradiation angle of the LED light source is generally narrower than that when an incandescent light source bulb is used as a light source, and a plurality of LEDs are often used. When many LEDs are used, when the light emitting surface (design surface) of the vehicular lamp is observed from the front in the irradiation direction, a portion corresponding to each of the LED light sources is observed brightly, and a phenomenon called spotlight is observed.

  Moreover, using many LEDs as a light source causes problems such as an increase in cost and a decrease in performance due to a temperature rise. Therefore, a vehicular lamp has also been proposed in which the total number of LEDs used as the light source is reduced so that the number of LEDs used is larger than the actual number of LEDs used (Patent Document 1).

  FIGS. 13 and 14 show the vehicular lamp described in Patent Document 1, and FIG. 15 shows the light emission state on the lens surface. The vehicular lamp 91 forms an inner lens 94 provided with a linear polyhedral prism cut 95 in which polyhedral prisms formed by combining a plurality of different refraction angles in a cross section orthogonal to the columns of the LEDs 92 are arranged in parallel along the column direction. The lens 94 is a vehicular lamp 1 arranged so as to cover at least a portion other than the front portion of the row of the LEDs 92, so that the linear polyhedral prism cut 95 causes the direction perpendicular to the row direction (X) of the LEDs 92. In (Y), it is viewed as if the LED 92 is arranged.

JP-A-6-187810

  When the vehicular lamp 1 disclosed in Patent Document 1 is viewed, the number and size of the LEDs 92 actually used on the light emitting surface that is emitted through the inner lens 94 provided with the linear polyhedral prism cuts 95 are set. A bright light emission point A1 observed on the front surface of each corresponding LED and the same light emission point as that of the light emission point are observed, but a pseudo light emission point A2 that approximates the light emission point is observed even at a position where no LED is actually provided. Is done. The light emission point A1 and the pseudo light emission point A2 that are observed at this time are pseudo light emission points that are almost equal to or larger than the LED 92 actually used, in other words, the light emission point corresponding to the light source image. It is only what is observed in large numbers.

That is, on the entire light emitting surface, bright light emitting points A1 and pseudo light emitting points A2 are aligned, and dark non-light emitting point regions are repeatedly present between these light emitting points. Therefore, unevenness in brightness occurs between the light emitting point non-light emitting region and the uniformity of the entire light emitting surface is poor.
Moreover, the bright light emission point corresponding to the LED row | line | column which provided LED is located in the center row | line | column of a light emission surface, and is observed as a light emission point different from a dark pseudo light emission point compared with the light emission point of a center row | line. Therefore, it is possible to estimate the LED array that is transmitted through the inner lens.

  Therefore, when the light emitting surface of the vehicular lamp, that is, the design surface, is viewed, it is recognized as a design surface with uneven brightness, and gives the viewer the impression of an aggregate of point light emission.

Accordingly, an object of the present invention is to provide a vehicular lamp having a light emitting surface in which minute light emitting points are scattered in the surface light emission as a background of surface light emission, preferably surface light emission with less brightness unevenness. To do.

In order to solve the above problems, a vehicular lamp according to the present invention includes:
A lamp housing attached to the vehicle body; a lens cover covering a front surface of the lamp housing; at least one light source unit provided in a lamp chamber surrounded by the lamp housing and the lens cover; and between the light source unit and the lens cover An inner lens unit provided in the
The inner lens unit includes a first inner lens and a second inner lens,
The first inner lens includes a light source unit side surface that is an incident surface on which light emitted from the light source unit side is incident, and a second inner lens side that is a surface opposite to the light source unit side surface and serves as an emission surface. With a surface,
On the light source unit side surface, a plurality of cylindrical prism rows are formed in a regular manner extending in the first direction,
On the second inner lens side surface, cylindrical prism rows are formed in a regular line extending in a second direction intersecting the first direction,
The second inner lens is a first inner lens side surface serving as an incident surface on which light emitted from the first inner lens is incident, and a surface opposite to the first inner lens side surface and serving as an emission surface. It has an outer lens side surface,
On the first inner lens side surface, a plurality of cylindrical prism rows are regularly arranged extending in a third direction intersecting the second direction,
On the outer lens side surface, cylindrical prism rows are formed in a regular manner extending in a fourth direction intersecting the third direction,
The cylindrical prism array is a prism lens element having a cylindrical refracting surface or a polyhedral prism lens element having a polyhedral refracting surface having a polygonal cross section having five or more polygonal cross sections that can be approximated to a cylindrical shape. Is a row of prisms,
The cylindrical prism row formed on each surface of the light source unit side surface, the second inner lens side surface, the first inner lens side surface, and the outer lens side surface is at least one of the four surfaces. Cylindrical prism rows formed on three surfaces are the polyhedral prism lens elements,
The first inner lens and the second inner lens are characterized by being separated from a longest pitch among the cylindrical prism array lenses formed on the three surfaces.

According to the invention described above, it is possible to obtain a surface-emitting light-emitting surface excellent in uniformity with little brightness unevenness, and minute light-emitting points can be scattered in the light-emitting surface. As a result, a new-looking vehicle lamp can be provided.

FIG. 1 is a schematic horizontal sectional view of the vehicular lamp according to the first embodiment. FIG. 2 is an enlarged horizontal sectional view of the light source unit 5 of FIG. 3 is an enlarged schematic perspective view showing an example of a cylindrical prism array formed on one surface of the inner lens of FIG. FIG. 4 is a simplified perspective view for explaining the relationship between the lens unit and the light source unit of FIG. FIG. 5 is a schematic view showing a light emission state when the prism direction shown in FIG. 4 is used. FIG. 6 is a schematic cross-sectional view for explaining the principle of the vehicular lamp of FIG. FIG. 7 is a perspective view schematically showing the relationship between the lens unit and the light source unit in the vehicular lamp according to the second embodiment. FIG. 8 is a schematic diagram showing a light emission state when the prism direction shown in FIG. 7 is used. FIG. 9 is a cross-sectional view schematically showing the principle of the main part of the vehicular lamp according to the third embodiment. FIG. 10 is a perspective view schematically illustrating the relationship between the lens unit and the light source unit in the vehicular lamp according to the fourth embodiment. FIG. 11 is a perspective view schematically showing a vehicular lamp according to the fifth embodiment. . FIG. 12 is a front view showing an example of an array state of lighting of the vehicular lamp of FIG. It is sectional drawing which shows the vehicle lamp of patent document 1. It is a perspective view which expands and shows the part of the linear polyhedral prism cut of the vehicle lamp of patent document 1. FIG. It is explanatory drawing which shows the light emission surface of the vehicle lamp of patent document 1. FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings for a rear combination lamp as an example of a vehicular lamp.
In this specification, the “light source unit” refers to a light source for exhibiting the function of a vehicle signal lamp, a reflector that reflects light emitted from the light source, a lens element that refracts light emitted from the light source, and the like. An optical system is included. “Vehicle body” refers to a structure that forms the skeleton of a vehicle excluding an engine and electrical components.
Unless otherwise specified, “front” refers to the vehicle traveling direction, and “rear” refers to the direction opposite to the vehicle traveling direction. In the case of a headlamp, light is emitted toward the front side of the vehicle, and in the case of a back lamp, the light is emitted toward the rear side of the vehicle. Similarly, the right side, the left side, the upper side, and the lower side are also based on the vehicle traveling direction. For example, in the case of a headlamp, this is equivalent to a case where the driver of the automobile is in a driving posture in the direction of travel. “Lamp front” refers to a state seen from the main irradiation direction side of the vehicular lamp.

  FIG. 1 is a schematic horizontal sectional view of a rear combination lamp provided at a corner at the rear of the vehicle (right rear corner). Reference numeral 1 denotes a rear combination lamp which is a vehicular lamp. The rear combination lamp 1 is covered with a transparent lens cover 3 on the front surface (rear side of the vehicle) of the lamp housing 2, and a light source unit 5 is placed in a lamp chamber 4 surrounded by the lamp housing 2 and the lens cover 3. Has been placed. The light source unit 5 is a light source unit that functions as a tail / stop lamp. Another function, for example, a light source unit (not shown) of a turn lamp is installed in the light chamber 4 on the side surface of the vehicle of the light source unit 5. An inner lens unit 6 is provided in front of the light source unit 5 in the irradiation direction, that is, on the vehicle rear side.

  FIG. 2 is an enlarged horizontal sectional view of the light source unit 5 of FIG. The light source unit 5 includes a resinous concave reflector 53 having an inner surface provided with a reflective film such as aluminum, and a light source portion 54 provided at the bottom of the reflector 53. A plurality of LED light sources 50 are mounted on the light source unit 54 via a mounting board (not shown). The mounting board is provided with electrical wiring for connecting an LED light source and a power source (not shown), and the electrical wiring extends through a hole provided in the reflector 53 to the rear side of the reflector 53. The inner surface of the reflector 53, particularly the region that reflects the irradiation light from the LED light source 50, is a reflecting surface in which individual reflecting surfaces divided into a number of regions are gathered, and the reflected light from each individual reflecting surface is the lens unit 6 described later. Designed to head towards.

  The LED light source 50 includes two rows of LED light sources, a first row of LED light sources 51 and a second row of LED light sources 52. In the present embodiment, a plurality of first rows of LED light sources 51 are aligned on a mounting board (not shown) extending in the direction perpendicular to the paper surface in FIG. 1 and FIG. The LED light sources 52 are installed in two rows aligned. The LED light sources 51 and 52 in the first row and the second row are both surface-mounted LEDs that emit red light. When functioning as a tail lamp, the LED light source 51 in the first row is lit and when functioning as a stop lamp. Both the LED light source 51 in the first row and the LED light source 52 in the second row are lit, and the rear of the vehicle is illuminated brighter in the case of the stop lamp than the tail lamp.

  The lens unit 6 includes a first inner lens 61 and a second inner lens 62 disposed in front of the LED light source 50 in the irradiation direction. Prism elements are formed on the respective surfaces of the first inner lens 61 on the LED light source 50 side and the second inner lens 62 on the lens cover 3 side. The prism element includes a cylindrical prism array 8 in which a large number of cylindrical prisms 7 are arranged.

  The cylindrical prism 7 is a cylindrical lens or a toric lens prism having a cylindrical refracting surface. A cylindrical lens can collect and diverge light in only one direction, and a toric lens is a cylindrical lens with a refracting surface that is bent both in the axial direction of the cylindrical refracting surface. Arbitrarily refers to a lens that can collect and diverge light. Further, in this specification, the cylindrical prism 7 is not limited to a cylindrical refracting surface in a strict sense, but includes a prism having a polyhedral prism lens element PPL that can be approximated to a cylindrical refracting surface. Therefore, the cylindrical prism 7 includes the linear polyhedral prism cut 95 described in Patent Document 1. In order to obtain uniform light emission with a small number of inner lens lens units, the number of polyhedrons is preferably at least 5 or more.

  FIG. 3 is an enlarged view of an example of the cylindrical prism row 8 formed on one surface, and is a plane in a cross section along the axial direction D and a polygon in a cross section perpendicular to the axial direction D. The polyhedral prism lens elements PPL having the following structure are continuously arranged at a constant pitch p.

  The first inner lens 61 is formed of a translucent material such as acrylic or polycarbonate, and is formed into a red transparent plate shape. On both surfaces of the light source unit side surface 63 that is an incident surface on which light emitted from the translucent light source unit 5 is incident and the second inner lens side surface 64 that is the opposite surface and is an emission surface, Cylindrical prisms 7 are integrally formed side by side in a predetermined direction.

The second inner lens 62 is also formed of a translucent material such as acrylic or polycarbonate, and is formed into a red transparent plate shape. A first inner lens side surface 64 that is an incident surface on which light emitted from the translucent light source unit 5 enters through the first inner lens 61 and an outer lens side that is the opposite surface and serves as an emission surface On both surfaces of the surface 66, cylindrical prisms 7 are integrally formed side by side in a predetermined direction.
The space between the first inner lens 61 and the second inner lens 62 is an air layer, and the distance between them is longer than the pitch p of the cylindrical prism 7 and parallel to the first inner lens 61. It is arranged.

  FIG. 4 is a simplified illustration for explaining the relationship between the lens unit 6 and the light source unit 5. The direction of the cylindrical prism row 8 formed on each surface, that is, the axial direction of each cylindrical prism 7 is indicated by an arrow. The arrow indicated by the dotted line is the prism direction on the surface on the light source unit 5 side, and the arrow indicated by the solid line is the prism direction on the surface on the emission surface side.

  In the first inner lens 61, the prism direction D 1 of the cylindrical prism row 8 provided on the light source unit side surface 63 is a vertical direction, and the prism direction D 2 of the cylindrical prism row 8 provided on the second inner lens side surface 64. Is a horizontal direction perpendicular to the prism direction D1.

  In the second inner lens 62, the prism direction D 3 of the cylindrical prism row 8 provided on the first inner lens side surface 64 is a vertical direction, and the prism direction D 4 of the cylindrical prism row 8 provided on the outer lens side surface 66. Is a horizontal direction perpendicular to the prism direction D3.

  FIG. 5 is a schematic view showing a light emitting state of the light emitting surface of the lens unit 6 when the prism direction shown in FIG. 4 is used, that is, a state in which the second inner lens 62 is observed. FIG. 6 is a schematic cross-sectional view for explaining the principle of the vehicular lamp 1. Symbol CL is the optical axis (center axis) of the light source unit.

  In the present embodiment, cylindrical prisms 7 formed on the respective surfaces are used as follows. The pitch p is 0.5 mm, the radius of the cylindrical cross section approximated to the cylindrical prism is 0.5 mm, and the number of polyhedrons is 10 planes (a surface obtained by dividing the surface of the half cylinder). In addition, the first inner lens 61 and the second inner lens 62 were disposed with a distance of 10 mm.

  The light L0 emitted from the light source unit 5 passes through the prisms on both sides formed on the first inner lens 61, so that a large number of light sources are vertically and horizontally even though it is the light of one light source (LED). The light is emitted so that it can be seen. A light emitting point observed by the first inner lens 61 is denoted by reference numeral A61. Light emitted from the non-emission point region S61 other than the emission point A61 is emitted while diffusing. In the schematic diagram shown in FIG. 6, the light beam L1 corresponds to the light emission point A61, and the light beam L2 corresponds to light in the non-light emission point region S61.

  The light emitted from the light source unit 5 and passing through the first inner lens 61 passes through the double-sided prisms formed on the second inner lens 62. At this time, the light emitted from the respective light emitting points A61 is incident on the cylindrical prism row 8 on the first inner lens side surface 65. At this time, in the prism direction D3, it is a flat incident surface, and in the direction orthogonal to the prism direction D3, it is an incident surface of a refracting surface that condenses and diffuses. Thereafter, the light enters the cylindrical prism row 8 on the outer lens side surface 66. At this time, in the prism direction D4, the light exit surface is a flat surface, and in the direction orthogonal to the prism direction D4, the light exit surface is a refractive surface that condenses and diffuses. By passing through the second inner lens 62, the light from the multiple light emitting points A 61 of the first inner lens 61 and the diffused light from the non-light emitting point region S 61 are more uniform than the exit surface of the first inner lens 61. Becomes the light emitting surface 9 of the non-light emitting point region S62 improved. As a result, almost the entire light emitting surface 9 emits as a non-light emitting point region S62 that diffuses and emits light. In the schematic diagram shown in FIG. 6, the light beam L3 corresponds to the light emission point A62, and the light beams L4 and L5 correspond to light in the non-light emission point region S62.

  Further, on the light emitting surface 9, small light emitting points A62 that are smaller than the light emitting point A61 are scattered in the uniform non-light emitting point region S62 and observed. When the minute light emission points A62 are arranged as shown in FIG. 4, a relatively large number of minute light emission points A62 are distributed in the upper region of the light emitting surface 9. This is because flat surfaces are formed on both surfaces of the second inner lens 62 and the arrangement shown in FIG. 4 is adopted. In FIG. 5, the light emission point A62 is shown large for easy understanding. However, the light emission point A62 is smaller than the emission surface of the LED used for the light source, specifically, all the light emission points are 0. Small luminescent spots with a size of about 5 mm or less were scattered and observed.

(Second Embodiment)
7 and 8 show a vehicular lamp according to the second embodiment. FIG. 7 is a perspective view schematically showing the relationship between the lens unit and the light source unit in the vehicular lamp, and FIG. 8 is a schematic diagram showing a light emission state when the prism direction shown in FIG. 7 is used. It is. In the second embodiment, only the directions of the prism direction D3 and the prism direction D4 of the second inner lens 62 in the lens unit 6 of the first embodiment are different.

  In the second inner lens 62, the prism direction D 3 of the cylindrical prism array 8 provided on the first inner lens side surface 64 corresponds to the prism direction 8 of the cylindrical prism array 8 provided on the second inner lens side surface 64 of the first inner lens 61. The direction is inclined 45 degrees with respect to the prism direction D2. The prism direction D4 of the cylindrical prism row 8 provided on the outer lens side surface 66 is an oblique direction inclined by 45 degrees on the opposite side orthogonal to the prism direction D3.

  Also in the second embodiment, the light emitted from the light source unit 5 and passing through the first inner lens 61 passes through the double-sided prisms formed on the second inner lens 62. At this time, the light emitted from the respective light emitting points A61 is incident on the cylindrical prism row 8 on the first inner lens side surface 65. At this time, in the prism direction D3, it is a flat incident surface, and in the direction orthogonal to the prism direction D3, it is an incident surface of a refracting surface that condenses and diffuses. The light enters the cylindrical prism row 8 on the outer lens side surface 66. At this time, in the prism direction D4, the light exit surface is a flat surface, and in the direction orthogonal to the prism direction D4, the light exit surface is a refractive surface that condenses and diffuses. By passing through the second inner lens 62, the light from the multiple light emitting points A 61 of the first inner lens 61 and the diffused light from the non-light emitting point region S 61 are more uniform than the exit surface of the first inner lens 61. Becomes the light emitting surface 9 of the non-light emitting point region S62 improved. As a result, almost the entire light emitting surface 9 emits as a non-light emitting point region S62 that diffuses and emits light.

Further, on the light emitting surface 9, small light emitting points A62 which are smaller than the light emitting point A61 are observed in the uniform non-light emitting point region S62.
Here, in the second embodiment, since the arrangement as shown in FIG. 7, a relatively large number of minute light emission points A62 are distributed in the region above the light emitting surface 9 in the arrangement shown in FIG. 4. Compared with the light emitting surface, the distribution of the minute light emitting points A62 is observed as a light emitting surface having the distribution shown in FIG.

(Third embodiment)
FIG. 9 is a cross-sectional view schematically showing the principle of the main part of the vehicle lamp according to the third embodiment. In the third embodiment, only the thick light guide 10 is disposed between the lens unit 6 and the lens cover 3 of the second embodiment. Is different.

  The light guide 10 is a trapezoidal light-transmitting member having a solid section between the incident surface 10a facing the outer lens side surface 66 of the second inner lens 62 and the exit surface 10b opposite to the incident surface 10a. Consists of. The side surface 10c is formed as a smooth surface substantially parallel to the optical axis CL. Most of the light that has entered the light guide 10 from the incident surface 10a is internally reflected by the side surface 10c and then exits from the exit surface 10b. The exit surface 10b has a smaller area than the entrance surface 10a. The diffused light emitted from the second inner lens 62 is reflected by the side surface 10c at the interface with the air layer to the emission surface having the width a in the height direction of the emission surface 10b of the light guide plate 10. Can be converted. In addition, the sense of depth can be enhanced by the thick side surface 10c of the light guide.

  In the schematic diagram shown in FIG. 9, the light beam L1 corresponds to the light emission point A61 of the first inner lens, the light beam L2 corresponds to the light in the non-light emission point region S61 of the first inner lens, and the light beam L3 corresponds to the light emission of the second inner lens. For the point A62, the light beams L4 to L6 correspond to the light in the non-light emitting point region S62 of the second inner lens. Light rays L3 to L6 are light rays that have entered the light guide 10 from the incident surface 10a, and light rays L5 and L6 are emitted after being internally reflected by the side surface 10c of the light guide 10. In addition, on the light exit surface 10b of the light guide, small light emitting points A62 that are smaller than the light emitting point A61 are scattered in the uniform non-light emitting point region S62 and observed. The point that minute light emitting points are scattered in the light emitting surface (non-light emitting point region) with improved uniformity is the same as in the second embodiment.

(Fourth embodiment)
In the vehicular lamp 1 according to the second embodiment, a second inner lens in which the lens unit 6 is provided with a cylindrical prism only on one side instead of the second inner lens 62 provided with a cylindrical prism on both sides. Was used. Specifically, as shown in FIG. 10, the cylindrical prism row 8 is formed only on the first inner lens side surface 64, and the prism direction D3 of the first inner lens 61 is the same as in the second embodiment. The direction was inclined 45 degrees with respect to the prism direction D2 of the cylindrical prism row 8 provided on the second inner lens side surface 64. The outer lens side surface 66 is a flat surface without providing a cylindrical prism.

  Also in the fourth embodiment, the light emitting surface 9 is emitted as a non-light emitting point region where almost the entire surface is uniformly diffused with little brightness unevenness. Further, the light emitting surface 9 was observed to be scattered with minute light emitting points in a uniform non-light emitting point region. However, the minute light emission points are observed more widely than in the second embodiment.

(Fifth embodiment)
FIG. 11 is a perspective view schematically showing the vehicular lamp 20 according to the fifth embodiment, and FIG. 12 is a front view showing a lighting arrangement state of the vehicular lamp of FIG.

  In the vehicular lamp 20 of the fifth embodiment, three light source units 21, 22, and 23 are provided in the lamp housing 2. Three lens units 24, 25, and 26 are arranged in parallel in front of the light source units 21, 22, and 23 in the irradiation direction, corresponding to the respective light source units. Regarding the positional relationship between the light source unit 21 and the lens unit 24, the positional relationship between the light source unit 22 and the lens unit 25, and the positional relationship between the light source unit 23 and the lens unit 26, the light source in the vehicular lamp 1 according to the first embodiment. Since the positional relationship between the unit 5 and the lens unit 6 is the same, the description thereof is omitted here.

  The light source unit 21 uses two rows of LED light sources that use red LEDs (not shown) as light sources, and the light source unit 22 uses one row that uses red LEDs (not shown) as light sources, LED light sources, and amber light emission. Two rows of LED light sources composed of a single row of LEDs are used. The light source unit 23 uses two rows of LED light sources using amber light emitting LEDs (not shown) as light sources.

  Each of the second inner lenses in the lens units 24, 25, and 26, that is, the inner lens on the exit surface side, is formed of a clear acrylic resin. The first inner lens in the lens unit 24, that is, the inner lens on the light source unit 21 side, is formed of a red light-transmitting acrylic resin. The first inner lenses in the lens units 25 and 26, that is, the inner lenses on the light source units 22 and 23 side, are formed of an amber color translucent acrylic resin. The first amber color translucent inner lens of the light source unit 22 has a spectral transmittance capable of transmitting light of any emission wavelength of the red LED and the amber color emitted by the amber LED installed in the light source unit 22. ing.

  When the tail lamp is lit, only the light source unit 21 is lit to emit red light. When it is turned on as a stop lamp, the red LEDs of the light source unit 21 and the light source unit 23 are turned on. As a result, as shown in FIG. 12A, the left and center light emitting surfaces, that is, the light emitting surface 9 (24) and the light emitting surface 9 (25) emit light. When it is turned on as a turn lamp, the amber LED of the light source unit 23 and the light source unit 22 is turned on. As a result, as shown in FIG. 12B, the right and center light emitting surfaces of the paper, that is, the light emitting surface 9 (25) and the light emitting surface 9 (26) are turned on.

  The light source unit 22 is electrically connected to a lighting control device (not shown) that enables lighting control by selecting either a red light emitting LED row or an amber light emitting LED row. Further, the lighting control device is controlled so that red light emitted by the stop lamp is turned on with priority over amber light emission.

  A cylindrical prism is formed on each inner lens of the lens units 25, 26, and 27, as in the first embodiment. Therefore, on the light emitting surfaces of the front surfaces of the respective lens units, minute light emitting points are observed scattered in the surface light emission of the uniform non-light emitting point region when lit. Since the lens unit 25 of the light source unit 22 emits light with uniform diffuse light emission and minute light emission point, the light emission by the red light emission LED row or the light emission by the amber color LED row is turned on. , The surface emission of the uniform non-light emitting point region of each corresponding color is performed. Further, when not lit, the entire surfaces of the three lens units are formed of the same clear material, which gives a unified impression to the observer. Each second inner lens in the lens units 25, 26, and 27, that is, the inner lens on the exit surface side, is provided for each lens unit. However, as shown in FIG. ), An inner lens made of the same member in which the light emitting surface 9 (25) and the light emitting surface 9 (26) are integrated.

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. For example, in order to simplify the description in the present embodiment, the lens unit has been described using an inner lens composed of two plate-like members. Technically, a separate inner lens may be added. However. Considering the cost, it is preferable to use two inner lenses each having a cylindrical prism formed on both sides. In general, the outer shape of the exit surface side of the vehicular lamp is formed as a bent surface. The inner lens constituting the lens unit may also be formed as a bent surface corresponding to the outer shape. The cylindrical prism formed on the bent surface may be formed along the bent surface in a toric lens shape whose central axis is bent instead of the linear lens shape of the linear axis.

  According to the vehicular lamp according to the present invention, it is possible to provide a vehicular lamp capable of simultaneously obtaining a light emitting surface of diffuse surface emission excellent in uniformity and light emitting points scattered in the light emitting surface. Become. Therefore, the present invention can be applied not only to a stop lamp, a direction indicator lamp, a reverse lamp, an illumination lamp, and a high-mount stop lamp provided at the rear of the vehicle, but also to various vehicle signal lamps.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Lamp housing 3 Lens cover 4 Lamp chamber 5 Light source unit 6 Lens unit 7 Cylindrical prism 8 Cylindrical prism row 9 Light emission surface 10 Light guide 20 Vehicle lamp 21, 22, 23 Light source unit 24,25, 26 lens unit 50 LED light source 51 first row LED light source 52 second row LED light source 53 reflector 54 light source section 61 first inner lens 62 second inner lens 63 light source unit side surface 64 second inner lens side surface 65 first Inner lens side surface 66 Outer lens side surface 82 First light emitting surface 83 Second light emitting surface 91 Vehicular lamp 92 LED
94 Inner lens 95 Linear polyhedral prism cut A1 Light emission point A2 Pseudo light emission point A61, A62 Light emission point S61, S62 Non-light emission point region D1, D2, D3, D4 Prism direction p pitch PPL Polyhedral prism lens element L0 to L6 Ray

Claims (3)

A lamp housing attached to the vehicle body; a lens cover covering a front surface of the lamp housing; at least one light source unit provided in a lamp chamber surrounded by the lamp housing and the lens cover; and between the light source unit and the lens cover An inner lens unit provided in the
The inner lens unit includes a first inner lens and a second inner lens,
The first inner lens includes a light source unit side surface that is an incident surface on which light emitted from the light source unit side is incident, and a second inner lens side that is a surface opposite to the light source unit side surface and serves as an emission surface. With a surface,
On the light source unit side surface, a plurality of cylindrical prism rows are formed in a regular manner extending in the first direction,
On the second inner lens side surface, cylindrical prism rows are formed in a regular line extending in a second direction intersecting the first direction,
The second inner lens is a first inner lens side surface serving as an incident surface on which light emitted from the first inner lens is incident, and a surface opposite to the first inner lens side surface and serving as an emission surface. It has an outer lens side surface,
On the first inner lens side surface, a plurality of cylindrical prism rows are regularly arranged extending in a third direction intersecting the second direction,
On the outer lens side surface, cylindrical prism rows are formed in a regular manner extending in a fourth direction intersecting the third direction,
The cylindrical prism array is a prism lens element having a cylindrical refracting surface or a polyhedral prism lens element having a polyhedral refracting surface having a polygonal cross section having five or more polygonal cross sections that can be approximated to a cylindrical shape. Is a row of prisms,
The cylindrical prism row formed on each surface of the light source unit side surface, the second inner lens side surface, the first inner lens side surface, and the outer lens side surface is at least one of the four surfaces. Cylindrical prism rows formed on three surfaces are the polyhedral prism lens elements,
The first inner lens and the second inner lens are separated from the longest pitch among the cylindrical prism array lenses formed on the three surfaces.
A vehicular lamp characterized by the above.
The light source unit includes a plurality of LED light sources including an LED light source of a first emission color and an LED light source of a second emission color;
Furthermore, it comprises a lighting control device for the LED light source that switches between at least irradiation light with the first emission color and irradiation light with the second emission color,
Irradiating the first emission color and the second emission color from the same first emission surface through the inner lens unit,
The vehicular lamp according to claim 1.
Having a second light emitting surface and a third light emitting surface side by side with the first light emitting surface;
The light emitted from the second light emitting surface irradiates the first emission color through the inner lens unit,
3. The vehicular lamp according to claim 2, wherein the light emitted from the third light emitting surface emits the second light emission color through the inner lens unit. 4.

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