JP6144166B2 - Vehicle lighting - Google Patents

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).

  The vehicular lamp described in Patent Document 1 is shown in FIGS. 9 and 10, and the light emission state on the lens surface is shown in FIG. 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 vehicle lamp 1 is arranged such that the lens 94 covers at least a portion other than the front portion of the row of the LEDs 92. The plurality of LEDs 92 are arranged in a line along the X axis in FIG. 11, and a plurality of linear polyhedral prism cuts 95 are also arranged along the X axis. By doing in this way, it can be seen that the LED 92 is arranged in the orthogonal direction (Y) with respect to the column direction (X) of the LED 92 by the linear polyhedral prism cut 95. In FIG. 11, A (1) and A (2) are light emission points, and light emission points A (2) aligned along the direction Y orthogonal to the light emission points (A1) on the column direction X appear. The LED 92 is viewed in the orthogonal direction Y.

  In addition, a vehicular lamp that can be viewed as a light source with a depth is proposed (Patent Document 2).

The vehicular lamp 96 having a large number of LEDs 98 described in Patent Document 2 includes an inner surface side LED 98a provided on the back side of the opening of the substrate covered with the reflecting surface 97 as shown in FIGS. An inner lens 99 provided with a half mirror having an appropriate outer shape covering the inner surface side LED 98a and an outer peripheral LED 98b for irradiating light to the outer surface of the inner lens 99 are provided. The inner lens 99 provided with the half mirror and the reflecting surface 97 are repeatedly reflected to be viewed as a three-dimensional appearance.

JP-A-6-187810 JP 2002-25310 A

  When the vehicular lamp 91 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 cut 95 is set. A bright light emission point A1 observed on the front surface of each corresponding LED, and a pseudo light emission point A2 that is observed in the same manner as the light emission point, but is actually similar to the light emission point even at a position where no LED is provided. Is observed.

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 it 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 viewing the light emitting surface of the vehicular lamp, that is, the design surface, it is recognized as a design surface with uneven brightness.

  When viewing the vehicular lamp 95 disclosed in Patent Document 2, the sense of depth is enhanced by using the inner lens 99 provided with a half mirror. However, in order to obtain more light emitting points, the number of inner surface side LEDs 98a had to be increased.

Accordingly, the present invention provides a vehicular lamp having a light emitting surface in which surface light emission, preferably surface light emission with less brightness unevenness, is provided, and minute light emitting points are scattered with a sense of depth in the surface light emission. The purpose is to do.

  In order to solve the above problems, the present invention provides an inner lens unit in which a plurality of cylindrical prism rows are formed so as to intersect each of both surfaces of an inner lens, and the cylindrical prism rows are provided with polyhedral prism lens rows. The main feature is that a semi-transparent mirror and a light guide member are provided between the inner lens and the lens cover.

The present invention includes a substrate provided with a first reflective surface and an LED light source facing the inner lens on the side opposite to the lens cover of the inner lens, and is sandwiched between the first reflective surface and the inner lens. The main feature is that a second reflecting surface is provided at a position around the space.

According to the above-described invention, a surface-emitting light-emitting surface excellent in uniformity with little brightness unevenness can be obtained, and small light-emitting points can be scattered in the light-emitting surface with a sense of depth. 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 tail / stop lamp 1a 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 diagram showing the light emission state of the exit surface of the semi-transparent mirror of the lens unit. FIG. 6 is a schematic longitudinal sectional view for explaining light rays from the light source to the semi-transmissive mirror. FIG. 7 is a schematic longitudinal sectional view showing the vehicular lamp according to the second embodiment. FIG. 8 is a sectional view schematically showing the principle of the main part of the vehicular lamp according to the third embodiment. 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. It is sectional drawing which shows the light emission surface of the vehicle lamp of patent document 2. FIG. It is a perspective view which shows the light emission surface of the vehicle lamp of patent document 2. 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.
Unless otherwise specified in the present specification, the “light source unit” refers to a light source for exhibiting the function of a vehicle signal lamp, or a lens element that reflects and / or refracts light emitted from the light source and the light source. This includes an optical system such as “Vehicle body” refers to a structure that forms the skeleton of a vehicle excluding an engine and electrical components. “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 rear combination 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 lamp chamber 4 on the side surface of the vehicle of the tail / stop lamp 1a. An inner lens unit 6 (hereinafter abbreviated as a lens unit) and a light guide member 10 are provided in front of the light source unit 5 in the irradiation direction, that is, on the rear side of the vehicle.

FIG. 2 is an enlarged horizontal sectional view of the tail / stop lamp 1a of FIG.
The light source unit 5 is attached to a light source attachment hole provided on the bottom surface of the concave portion of the concave reflector 21. The base 54 is positioned on the opening side of the light source mounting hole, and the socket 54a is mounted on the opposite side. A plurality of LED light sources 50 are mounted on the base 54. The base 54 is provided with electrical wiring for connecting an LED light source and a power source (not shown), and the electrical wiring is connected to an electrode terminal (not shown) of the socket 54a so that power can be supplied to the LED light source 50. The electric wiring is extended to the rear side of the reflector 21 through a hole provided in the reflector 21.

  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 row LED light sources 51 are aligned on a base (not shown) extending in the direction perpendicular to the paper surface in FIG. 1 and FIG. The 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.

  A first reflecting surface 55 is formed on the surface of the substrate 54 on which the LED light source 50 is mounted. The first reflecting surface 55 is formed on the LED light source mounting surface excluding the place where the LED light source 50 is mounted on the base 54. The first reflecting surface 55 is made of an insulating reflective resin in which a ceramic material having high reflection characteristics such as barium oxide or titanium oxide or a glass bead is dispersed and mixed in a resin, or a metal film having a high reflectance such as aluminum. It is possible to use a metal reflective film formed via A diffuse reflection surface made of an insulating reflective resin, particularly a coating film made of a white resin in which ceramic is dispersed and mixed, is preferable. This is because brightness unevenness can be further reduced by using a diffuse reflection surface. The LED light source 50 may be provided on the base 54 via a mounting board (not shown). In that case, it is preferable that the first reflection surface 55 is also formed on a mounting substrate (not shown) so as not to impair the reflection function of the first reflection surface 55.

  The reflector 21 is formed of a resin member provided with a reflective film such as aluminum on the inner surface, and has a concave shape in which a light source mounting hole for mounting the light source unit 5 is formed on the bottom surface of the concave portion. The light source unit 5 may be installed on the bottom surface of the reflector 21. The inner surface of the reflector 21, 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 reflecting surface on the bottom surface of the recess is referred to as a bottom surface reflecting surface 22, and the reflecting surface other than the bottom surface reflecting surface 22 is referred to as a side wall reflecting surface 23. The individual reflecting surfaces described above are formed on the side wall reflecting surface 23. A space 24a is formed between the light source unit 5 and the lens unit 6 at a predetermined distance. The side wall reflecting surface 23 corresponds to a second reflecting surface extending in a direction connecting the first reflecting surface and the first inner lens around a space sandwiched between the first reflecting surface and the first inner lens.

  The lens unit 6 includes a first inner lens 61 and a semi-transmissive mirror 62 disposed in front of the LED light source 50 in the irradiation direction. The first inner lens 61 is disposed on the LED light source 50 side. Prism elements are formed on the front and back surfaces of the first inner lens 61. 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 addition, a lens unit of an inner lens with a small number of polyhedrons is preferable. In order to obtain uniform light emission, at least five surfaces are preferable.

  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 made of a translucent material such as acrylic or polycarbonate, and is formed into a colorless and transparent plate shape. On both surfaces of the light source unit side surface 63 which is an incident surface on which light emitted from the translucent light source unit 5 is incident and the semi-transparent mirror side surface 64 which is the opposite surface and which is the output surface, are cylindrical. The prisms 7 are integrally formed side by side in a predetermined direction. In FIG. 2, the cylindrical prism formed on the light source unit side surface 63 extends in the direction parallel to the paper surface, and the cylindrical prism formed on the semi-transparent mirror side surface 64 extends in the direction normal to the paper surface.

  The semi-transmissive mirror 62 is formed by thinly reflecting a reflective material such as aluminum or silver on a sheet formed of a translucent resin material such as acrylic, PET (polyethylene terephthalate), or PP (polypropylene). Further, it is fixed to the lens cover 3 side so as to be in contact with the first inner lens 61 and / or with an interval. The first inner lens side surface 64 on which the light emitted from the light source unit 5 passes through the first inner lens 61 is an incident surface, and the opposite surface, that is, the lens cover side surface 66 is an output surface. Become. In addition, an air layer containing air between the cylindrical prisms is formed between the first inner lens 61 and the semi-transmissive mirror 62. In FIG. 2, the semi-transmissive mirror 62 is hatched with diagonal lines so as to be easily distinguished from the first inner lens 61.

  The light guide member 10 is a solid light guide formed of a light-transmitting material such as acrylic or polycarbonate. In addition, in the space 24 b between the semi-transmissive mirror 62 and the lens cover 3, the light guide member 10 is installed at a position closer to the lens cover 3 than the semi-transmissive mirror 62. It has a cubic shape including an incident surface 11 on which light that has passed through the semi-transmissive mirror 62 is incident, an exit surface 12 that is located on the lens cover side on the opposite surface, and a side surface 13. The side surface 13 corresponds to a total reflection surface extending in a direction connecting the exit surface of the lens cover 3 and the semi-transmissive mirror 64.

  FIG. 4 is a simplified illustration for explaining the relationship between the lens unit 6 and the light source unit 5.

  In FIG. 4, the direction of the cylindrical prism row 8 formed on each surface of the first inner lens 61, that is, the axial direction D 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 D1 of the cylindrical prism array 8 provided on the light source unit side surface 63 is a vertical direction, and the cylindrical prism array provided on the output surface side (semi-transmission mirror 62 side) surface 64. The prism direction D2 of 8 is a horizontal line direction orthogonal to the prism direction D1.

  FIG. 5 is a schematic view showing a light emission state of the exit surface of the semi-transmissive mirror of the lens unit 6, that is, a state where the semi-transmissive mirror 62 is observed. FIG. 6 is a schematic longitudinal sectional view for explaining light rays between the light source unit 5 and the semi-transmissive mirror 62 in the present embodiment. 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). Further, the first inner lens 61 and the semi-transmissive mirror 62 are arranged with a distance of about 3 mm.

  As shown in FIG. 6, the light L0 emitted from the light source unit 5 passes through the prisms on both sides formed on the first inner lens 61, and thus is the light of one light source (LED). Instead, the light emitting points are divided into small sizes, and light is scattered so that a large number of light sources can be seen side by side. The scattered light emitting points are indicated by reference numerals A61 and A62 in FIG. On the optical axis of the LED, there is a large light emission point A61 in the emission surface of the first inner lens 61, and a small light emission point A62 exists around the large light emission point A61. Light from these light emitting points is directed to the semi-transmissive mirror 62, a part thereof passes through the semi-transmissive mirror 62, and a part thereof is reflected. The emission points observed through the semi-transmissive mirror 62 are indicated by dotted lines in FIG. 5 and indicated by reference numerals S61, S62, and S63. The light emission points are roughly divided into a light emission point S62 through which a part of the light from the light emission point A62 passes, a light emission point S61 through which a part of the light from the light emission point A61 passes, and other light emission points S63. . The light emitting point S63 is a light emitting point by a light beam that has been reflected back by the semi-transmissive mirror 62 and returned. S64 is a light emitting surface that emits diffused light that is emitted as a background without becoming a bright spot due to diffuse reflection.

  When the light L0 emitted from the LED light source 50 passes through the first inner lens 61, the light emitting points are divided by the action of the prism rows formed on both surfaces, and L1, L4, L5, etc. are generated and emitted. The light beam with the symbol L1 becomes the light emission point A61, and travels toward the semi-transmission mirror 62, and indicates the light beam that has passed through the semi-transmission mirror 62, that is, the light emission point S61. Some of the divided light beams L4 are reflected by the side wall reflecting surface 23 of the reflector 21. The light L2 reflected by the surface of the semi-transmissive mirror 62 is reflected toward the light source unit 5 side. The reflected light L <b> 2 is reflected again by the first reflecting surface 55 formed on the surface of the light source unit 5. Further, the diffused light L <b> 3 irradiated from the light source unit 5 toward the side wall reflecting surface 23 is reflected by the side wall reflecting surface 23 and then passes through the first inner lens 61. The diffused light L3 is light with low illuminance emitted in a direction inclined from the emission optical axis of the LED. Light rays reflected by the semi-transmissive mirror 62 and having low illuminance, and light rays such as diffused light L3 are repeatedly reflected and refracted to generate diffused light. These diffused light becomes the outgoing light of S64.

  The light emitting points S61, S62, S63 and the diffused light emission S64 are incident on the inside from the incident surface 11 of the light guide member 10 disposed to face the semi-transmissive mirror 62. The light guided in the light guide member 10 is emitted from the emission surface 12. At this time, the light guide member 10 is formed with a thickness such that a part of the light guided and guided through the light guide member 10 is totally reflected by the side wall 13. Accordingly, the totally reflected light beam on the light guide member side wall 13 is also emitted from the emission surface 12. The light rays of the light emitting points S61, S62, and S63 that are totally reflected by the light guide member side wall 13 allow the light emitting points to be viewed even when viewed from an oblique direction, and enhances the sense of depth.

In the present embodiment, total reflection on the side wall 23 of the light guide member, partial reflection by the anti-transmission mirror 62, the first reflection surface 55 of the light source unit, and the side wall reflection surface (second reflection surface) 23 of the reflector. As a result, a part of the plurality of light emitting points formed by dividing the light of the single LED light source 50 is repeatedly reflected. When the reflected light beam is viewed as a bright spot, it is viewed as a light beam with a long sense of depth in the optical path. Therefore, a large number of bright spots are scattered with a sense of depth in the light emitting surface that diffuses and emits light as a whole.

(Second Embodiment)
FIG. 7 is a schematic longitudinal sectional view showing the vehicular lamp according to the second embodiment. In the second embodiment, the thickness (depth) of the light guide member 15 is increased to be substantially the same as the distance from the LED light source 50 to the first inner lens 61. Specifically, the depth from the entrance surface to the exit surface of the light guide member 15 and the length from the LED light source 50 to the first inner lens 61 are 600 mm. In addition, the thickness of the 1st inner lens 61 is less than 100 micrometers as thickness including the cylindrical prism formed in both surfaces, and the thickness of the anti-transmission mirror 62 is also less than 100 micrometers. Further, a side wall reflecting surface (second reflecting surface) 23 is formed by performing aluminum vapor deposition on the inner surface of the lamp housing 2. In addition, the code | symbol 17 in FIG. 7 is a fixing member which attaches the light guide member 15 grade | etc.,.

  By increasing the thickness (depth) of the light guide member 15, the total reflection component on the side surface 16 of the light guide member can be increased. Further, by making the thickness (depth) of the light guide member 15 and the distance from the LED light source 50 to the first inner lens 61 substantially the same, a depth sensation due to total reflection on the side surface 16 of the light guide member, and the LED The depth feeling between the light source 50 and the first inner lens 61 can be made equal even when the light is not lit. If an attempt is made to produce the light guide member by injection molding in order to increase the thickness of the light guide member, sink marks or the like are likely to occur, and the yield is likely to decrease. Also, the cooling time after injection into the mold increases. Therefore, the mass production efficiency is poor and the manufacturing cost increases. Therefore, practically, when the thickness (depth) of the light guide member 15 is 40 to 110%, preferably 50 to 70% with respect to the distance from the LED light source 50 to the first inner lens 61, it is visually recognized. It is possible to achieve an excellent balance between performance and mass production efficiency.

Also in the second embodiment, the light beam emitted from the light source unit 5 is observed as a light emitting surface that emits light with a sense of depth due to a plurality of light emitting points scattered while almost all of the light emitting surface diffuses and emits light. The

(Third embodiment)
FIG. 8 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 second inner lens 70 is disposed between the first inner lens 61 of the first embodiment and the semi-transmissive mirror 62 in the first embodiment. It is different from the form. Since other configurations are the same as those in the first embodiment, the same reference numerals are given, and description thereof is omitted here.

The second inner lens 70 is also formed of a light-transmitting material such as acrylic or polycarbonate, and is formed into a colorless and transparent plate shape. The first inner lens side surface 71 which is an incident surface on which light emitted from the translucent light source unit 5 passes through the first inner lens 61 and the lens cover side which is the opposite surface and becomes the emission surface On both surfaces of the surface 72, 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.

In the second inner lens 70, the prism direction D 3 of the cylindrical prism row 8 provided on the first inner lens side surface 71 is a vertical direction, and the prism direction D 4 of the cylindrical prism row 8 provided on the lens cover side surface 72. Is a horizontal direction perpendicular to the prism direction D3. That is, the second inner lens 70 is provided with the same lenses as the first inner lens 61 arranged in the same direction.
Cylindrical prisms 7 formed on the respective surfaces have a pitch p of 0.5 mm, a radius of a cylindrical cross section approximating that of the cylindrical prism is 0.5 mm, and the number of polyhedrons is 10 planes (a surface obtained by dividing the surface of a half cylinder into 10 parts). ). In addition, the first inner lens 61 and the second inner lens 62 were arranged with a distance of 10 mm.

  The light 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 arranged vertically and horizontally even though it is the light of one light source (LED). It is emitted so that it can be seen. The light emission point observed by the first inner lens 61 further passes through the second inner lens 70 and is further divided, and the light is emitted so that a large number of light sources can be seen side by side. As a result, when the exit surface (lens cover side surface 72) of the second inner lens 70 is viewed, observations are made with minute light emitting points that are smaller than the light emitting point A61 scattered in a uniform non-light emitting point region. Is done.

  According to the third embodiment, it is possible to have a larger number of finer light emission points than the vehicular lamp of the first embodiment. Moreover, the vehicular lamp with a feeling of depth can be obtained similarly to the vehicular lamp of the first embodiment.

(Modification of the third embodiment)
In the vehicular lamp 1 according to the third embodiment, the first inner lens 6 is provided only on one side instead of the cylindrical prisms provided on both sides of the first inner lens 61 and the second inner lens 70. A cylindrical prism is provided, and the surface on which the cylindrical prism is not provided is a flat surface. In this case as well, as in the third embodiment, the light emitting surface in which light emitting points with a depth sensation are scattered in the non-light emitting point region where light is uniformly diffused and emitted with almost no brightness unevenness. Can be obtained.
In addition, even when cylindrical prisms are provided on both surfaces of the first inner lens 61 and one surface of the second inner lens 70, and one surface of the second inner lens 70 is a flat surface provided with no cylindrical prism. It will be the same.

The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. For example, the outer shape of the exit surface side of the vehicular lamp is usually 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 1a Tail stop lamp 2 Lamp housing 3 Lens cover 4 Lamp chamber 5 Light source unit 6 Lens unit (inner lens unit)
7 Cylindrical prism 8 Cylindrical prism array 10 Light guide member 11 Light guide member incident surface 12 Light guide member exit surface 13 Light guide member side surface 15 Light guide member 16 Light guide member side surface 17 Fixed member 21 Reflector 22 Bottom reflection surface 23 Side wall Reflective surface (second reflective surface)
24a, 24b Space 50 LED light source 51 First row LED light source 52 Second row LED light source 54 Base (54... Light source section)
54a Socket 55 First reflection surface 61 First inner lens 62 Semi-transmission mirror 63 Light source unit side surface 64 Semi-transmission mirror 65 First inner lens side surface 66 Lens cover side surface 70 Second inner lens 71 First inner lens side surface 72 Lens cover side surface

91 Vehicle lamp 92 LED
94 Inner lens 95 Linear polyhedral prism cut 96 Vehicle lamp 97 Reflecting surface 98 LED
98a Internal LED
98b Outer peripheral LED
99 inner lens

A1, A2, Emission point A61, A62 Emission point S61, S62, S63 Emission point S64 Diffuse emission region D1, D2, D3, D4 Prism direction p Pitch PPL Polyhedral prism lens element L0-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 A vehicular lamp having an inner lens unit provided on the vehicle,
The inner lens unit includes a light source unit side surface that is an incident surface on which light emitted from the light source unit is incident, and a lens cover side surface that is a surface opposite to the light source unit surface and serves as an output surface. A first inner lens;
A semi-transmission mirror provided along the lens cover side surface of the first inner lens,
On the light source unit side surface, a plurality of cylindrical prism rows are formed in a regular manner extending in the first direction,
A cylindrical prism array is formed on the lens cover side surface so as to extend in a second direction intersecting the first direction and regularly arranged.
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,
Cylindrical prism rows formed on the light source unit side surface and the lens cover side surface, the cylindrical prism rows formed on the respective surfaces of the two surfaces are the polyhedral prism lens elements,
The light source unit has a substrate provided with a plurality of LED light sources and a first reflecting surface provided on the substrate surface,
The first reflective surface and the first inner lens are arranged to face each other, and the first reflective surface is disposed around a space sandwiched between the first reflective surface and the first inner lens. A second reflecting surface extending in a direction connecting the first inner lenses is formed;
Between the inner lens unit and the lens cover, a light guide member having a total reflection surface extending in a direction connecting the emission surface of the lens cover and the semi-transmissive mirror is provided.
A vehicular lamp characterized by the above.
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 A vehicular lamp having an inner lens unit provided on the vehicle,
The inner lens unit includes a light source unit side surface that is an incident surface on which light emitted from the light source unit is incident, and a lens cover side surface that is a surface opposite to the light source unit surface and serves as an output surface. A first inner lens;
A semi-transmission mirror provided along the lens cover side surface of the first inner lens,
On the light source unit side surface, a plurality of cylindrical prism rows are formed in a regular manner extending in the first direction,
A cylindrical prism array is formed on the lens cover side surface so as to extend in a second direction intersecting the first direction and regularly arranged.
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 light source unit has a substrate provided with a plurality of LED light sources and a first reflecting surface provided on the substrate surface,
The substrate reflecting surface and the first inner lens are disposed to face each other, and the space between the first reflecting surface and the first inner lens intersects with the first reflecting surface. A second reflecting surface extending in the direction is formed;
Between the inner lens unit and the lens cover, a light guide member having a total reflection surface extending in a direction connecting the emission surface of the lens cover and the semi-transmissive mirror is provided,
Further, the inner lens unit includes a second inner lens between the first inner lens and the semi-transmissive mirror,
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 a semi-transparent mirror side surface,
A plurality of cylindrical prism rows are formed on the first inner lens side surface in a regular manner extending in a third direction intersecting the second direction,
The cylindrical prism array is formed on the semi-transparent mirror side surface in a regular manner extending in a fourth direction intersecting the third direction,
Cylindrical prism arrays formed on the light source unit side surface and the outer lens side surface of the first inner lens and the first inner lens side surface and the semi-transparent mirror side surface of the second inner lens, respectively. , A cylindrical prism array formed on at least any three of the four surfaces is the polyhedral prism lens element;
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.
The vehicular lamp according to claim 1.
  3. The vehicular lamp according to claim 1, wherein the light guide member is a solid member having an incident surface disposed to face the exit surface of the semi-transmissive mirror.

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