Vehicle light

A technology for lamps and vehicles, which is applied in the direction of headlights, vehicle parts, optical elements used to change the spectral characteristics of emitted light, etc., to achieve the effect of simple structure

Pending Publication Date: 2022-01-28
ICHIKOH IND LTD
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AI-Extracted Technical Summary

Problems solved by technology

Therefore, since the distance from the installation position of the vehicle to the road surface changes according to the position in...
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Method used

Vehicle lamp (10) is equipped with: condenser lens (12), and it carries out condensing to the light that emits from light source (21); an illumination slit (25) through which the condensed light is partially transmitted; and a projection lens (14) which projects light passing through the filter (13) to form an illumination pattern (Pi). Moreover, in the vehicular lamp 10, the condenser lens 12 is on the filter 13, and makes the farthest position of the irradiation slit 25 the brightest and the darkest at the nearest position of the irradiation slit 25 in the up-down direction, and the width The direction diffuses the light emitted from the light source 21 more than the vertical direction. Therefore, the vehicular lamp 10 can moderate a sudden change in brightness caused by a change in the distance from the projection lens 14 to the projection surface by setting the brightness in the filter 13 . Thus, even when the vehicular lighting device 10 is installed with the optical axis La inclined relative to the road surface 2, it is possible to set the luminance on the filter 13 by the condensing lens 12 so that the light in the irradiation pattern Pi The luminance distribution becomes a desired distribution. Furthermore, the vehicular lamp 10 makes the irradiation pattern Pi have a desired luminance distribution by the condenser lens 12 composed of the single incident surface 12a and the exit surface 12b and the projection lens 14 composed of the single exit surface 27b and the incident surface 27a, Therefore, it is possible to have a simple structure.
[0054] In particular, in the vehicle lamp 10 of the first embodiment, since the light source 21 is set as monochromatic light, the influence of chromatic aberration in the projection lens 14 can be significantly suppressed. Therefore, the projection lens 14 can form the irradiation pattern Pi with a sharp outline and suppressed blurring.
[0062] In addition, the illumination pattern Pi of the vehicle lamp 10 has a plurality of arrayed illumination patterns Di, and the illumination slit 25 has slit portions 26 respectively corresponding to the illumination patterns Di. Therefore, by setting the luminance of each slit portion 26 using the condensing lens 12 in the vehicular lamp 10 , each i...
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Abstract

The present invention provides a vehicle light with which a brightness distribution can be set as desired in accordance with an illumination pattern while maintaining a simple configuration. A vehicle light (10) comprises a condensing lens (12) that condenses light emitted from a light source (21), a filter (13) in which illumination slits (25) are provided, and a projection lens (14) that projects light that has passed through the filter (13) and forms an illumination pattern (Pi). The illumination slits (25) have a farthest location corresponding to a farthest part projected at a most separated position in the illumination pattern (Pi), and a nearest location corresponding to a nearest part projected at a nearest position in the illumination pattern (Pi). The condensing lens (12) condenses light such that, above the filter (13), the farthest location of the illumination slits (25) is the brightest in the vertical direction, and the nearest location of the illumination slits (25) is the darkest, and diffuses light emitted from the light source (21) more in an optical axis direction and a width direction, which is orthogonal to the vertical direction, than in the vertical direction.

Application Domain

Vehicle headlampsOptical signalling +2

Technology Topic

Condensing lensLight filter +3

Image

  • Vehicle light
  • Vehicle light
  • Vehicle light

Examples

  • Experimental program(1)

Example Embodiment

[0028] Example 1
[0029] use Figure 1 to Figure 12 , the vehicle lamp 10 of Example 1 which is one embodiment of the vehicle lamp according to the present disclosure will be described. like figure 1 As shown, the vehicle lamp 10 of the first embodiment is used as a lamp for a vehicle 1 such as an automobile, and forms an irradiation pattern Pi on a road surface 2 around the vehicle 1 unlike a headlight provided on the vehicle 1 . Here, the periphery of the vehicle 1 must include an approach area closer to the vehicle 1 than the headlight area illuminated by the headlights provided on the vehicle 1 , and may partially include the headlight area. In Embodiment 1, the vehicle lamp 10 is arranged in the lamp houses on the left and right sides of the vehicle front. The lamp chamber is formed by covering the open front end of the lamp housing with an outer lens. In the lamp house, the vehicle lamp 10 is installed with the optical axis La inclined relative to the road surface 2 . This is because the lamp house is installed at a position higher than the road surface 2 . In the following description, in the vehicular lamp 10, the direction in which the optical axis La, which is the direction in which light is emitted, extends is the optical axis direction (referred to as Z in the drawings), and the optical axis direction is the direction along the horizontal plane. The vertical direction in the state is the up-down direction (Y in the drawing), and the direction (horizontal direction) perpendicular to the optical axis direction and the up-down direction is the width direction (X in the drawing) ( refer to figure 2 Wait).
[0030] like figure 2 As shown, the vehicle lamp 10 houses a light source unit 11, a condenser lens 12, a filter 13, and a projection lens 14 in a housing 15, and a heat dissipation member 16 is mounted on the housing 15 to form a projection-type road surface projection. unit. The housing 15 is composed of a lower member 15a and an upper member 15b, and the upper member 15b is fitted in a state where the above-mentioned members (11 to 14) are provided on the lower member 15a. In the housing 15, there are provided a condenser lens groove 15c for the condenser lens 12 to be embedded, a filter groove 15d for the optical filter 13 to be embedded, and a projection lens groove 15e for the projection lens 14 to be embedded (only shown below). side part 15a side).
[0031] The light source 21 of the light source unit 11 is mounted on a substrate 22 . The light source 21 is constituted by a light-emitting element such as an LED (Light Emitting Diode), and the emission optical axis is provided so as to coincide with the optical axis La. In Example 1, the light source 21 emits brown (amber) monochromatic light with a Lambertian distribution centered on the optical axis La (there is one peak in the graph in which the vertical axis represents light intensity and the horizontal axis represents wavelength). . In addition, the light source 21 is not limited to the structure of the first embodiment as long as the color (wavelength band) of the emitted light, the shape of the distribution, the number of colors (the number of peaks in the above-mentioned graph) and the like are appropriately set.
[0032] The board 22 appropriately supplies electric power from the lighting control circuit to turn on the light source 21 . The substrate 22 is housed in the rear end portion (the end portion on the side opposite to the projection lens groove 15e in the optical axis direction) of the housing 15 in a state of being attached to the installation surface of the heat dissipation member 16 (light source installation portion 16a).
[0033] The condensing lens 12 condenses the light emitted from the light source 21 and condenses the light on the filter 13 . The condenser lens 12 is formed by a biconvex lens in Embodiment 1, and the incident surface 12a and the outgoing surface 12b (refer to Figure 4 etc.) are free-form surfaces. The optical setting in the condensing lens 12 will be described later. In the condenser lens 12, mounting flange portions 12c are provided at both ends in the width direction. Each mounting flange portion 12 c can be fitted into the condenser lens groove 15 c of the housing 15 . The condenser lens 12 has a lens axis extending in the optical axis direction. The lens axis is an optical axis passing through a position where the thickness in the direction of the optical axis is the largest in the condenser lens 12 . When the mounting flange portion 12c is fitted into the condenser lens groove 15c, the extending direction of the lens axis of the condenser lens 12 coincides with the optical axis La. Incident surface 12a and exit surface 12b may be convex or concave as long as condenser lens 12 is a convex lens and satisfies optical settings described later, and are not limited to the configuration of Example 1.
[0034] The filter 13 transmits the light from the light source 21 condensed by the condensing lens 12 to form the irradiation pattern Pi. like figure 1 , etc., the irradiation pattern Pi has four irradiation patterns Di arranged at substantially equal intervals in the direction away from the vehicle 1 . The irradiation patterns Di are formed in a V-shape that is widely opened, and are formed in substantially equal sizes to each other. Here, when each of the illumination patterns Di is represented separately, the illumination pattern farthest from the vehicle 1 is referred to as the first illumination pattern Di1, and as it approaches the vehicle 1 sequentially from there, it is referred to as the second illumination pattern Di2 and the third illumination pattern Di2. Di3, the fourth radiation pattern Di4. Therefore, in the irradiation pattern Pi, the first irradiation pattern Di1 is the farthest part, and the fourth irradiation pattern Di4 is the closest part. By arranging the four irradiation patterns Di so that the vertices of the V-shape are substantially on a straight line, the irradiation pattern Pi can be made to look like an arrow pointing to a predetermined direction from the vehicle 1 . In Embodiment 1, the vehicle lamps 10 are installed on the left and right front ends of the vehicle 1, respectively, and illuminate the surrounding road surface 2 in such a manner as to point obliquely toward the front side in the front-rear direction of the vehicle 1 and outward in the width direction. Pattern Pi. This irradiation pattern Pi can inform the surroundings of the direction in which the vehicle 1 is traveling, and is formed in conjunction with the turn signal in the first embodiment.
[0035] like image 3 As shown, the filter portion 23 of the filter 13 is disposed on the filter frame portion 24 . The filter frame portion 24 is formed in a frame shape surrounding the filter portion 23, and can be fitted into the filter groove 15d of the housing 15 (see figure 1 )middle.
[0036]The filter unit 23 is basically formed of a plate-shaped film member that prevents transmission of light, and is provided with an irradiation slit 25 . The irradiation slit 25 partially transmits the light from the light source 21 condensed by the condensing lens 12 to form the shape of the irradiation pattern Pi. The irradiation slit 25 corresponds to the irradiation pattern Pi, and is composed of four slit portions 26 in the first embodiment. The four slits 26 correspond one-to-one to the four irradiation patterns Di, are formed in a V-shape that is widely opened like each irradiation pattern Di, and are different in size from each irradiation pattern Di, and set to different intervals. Specifically, in the vehicle lamp 10, the optical axis La is set to be inclined relative to the road surface 2, so that the distances from the optical filter 13 and the projection lens 14 to the road surface 2 are different. , each slit portion 26 (as each irradiation pattern Di of the light transmitted therethrough) has a size and interval corresponding to the distance. Therefore, the size and interval of each slit portion 26 are set according to the distance from the road surface 2 so that each slit portion 26 (each irradiation pattern Di) on the road surface 2 has approximately the same size and approximately equal intervals.
[0037] In addition, with respect to the positional relationship of each irradiation pattern Di of the irradiation pattern Pi, each slit portion 26 has a positional relationship to be rotated around the optical axis La. Specifically, since the vehicle lighting device 10 inverts the projection lens 14 to project the filter 13 (irradiation slit 25 ) onto the road surface 2 , so that each illumination pattern Di has a collimated positional relationship on the road surface 2 , for each The irradiation pattern Di rotates the positional relationship of the object around the optical axis La to provide each slit portion 26 . Therefore, the first slit portion 261 on the lowermost side in the vertical direction of each slit portion 26 is the farthest portion corresponding to the first irradiation pattern Di1 (the farthest portion) of the irradiation pattern Pi. And, in each slit portion 26, the second slit portion 262 on it corresponds to the second irradiation pattern Di2, the third slit portion 263 on it corresponds to the third irradiation pattern Di3, and the fourth slit on the uppermost side corresponds to the second irradiation pattern Di2. The portion 264 is the closest portion corresponding to the fourth irradiation pattern Di4 (nearest portion) of the irradiation pattern Pi. In the optical filter 13 of Example 1, in the vertical direction, the third slit portion 263 is provided so as to straddle the optical axis La, and the fourth slit portion 264 is provided thereon, and the third slit portion 263 A second slit portion 262 and a first slit portion 261 are provided below.
[0038] Here, if figure 1 As shown, the vehicle lamp 10 forms the irradiation pattern Pi symmetrically with respect to a plane perpendicular to the width direction of the vehicle 1 on the left and right sides of the vehicle 1 . Therefore, if image 3 As shown, the vehicular lamp 10 is provided with two filters 13R for the right side when installed in the front right of the vehicle 1 and two filters 13L for the left side when installed in the front left of the vehicle 1 . The two optical filters 13R and 13L have a structure equal to each other except that the irradiation slits 25 (the respective slit portions 26 ) are provided symmetrically with respect to the plane perpendicular to the width direction. This filter 13 (light transmitted through each slit portion 26 of the illumination slit 25 ) is projected onto the road surface 2 through the projection lens 14 .
[0039] like figure 2 As shown, the projection lens 14 includes a lens body portion 27 that is a circular convex lens when viewed in the optical axis direction, and a flange portion 28 surrounding the periphery thereof. In Example 1, the incident surface 27 a and the outgoing surface 27 b of the lens main body 27 are formed as convex free-form surfaces. The optical setting in the lens body portion 27 of the projection lens 14 will be described later. The projection lens 14 has a lens axis extending in the optical axis direction. The lens axis is an optical axis passing through a position where the thickness in the optical axis direction is the largest in the lens body portion 27 . In addition, the incident surface 27a and the outgoing surface 27b may be convex or concave as long as the lens body 27 is a convex lens and satisfies optical settings described later, and are not limited to the structure of the first embodiment.
[0040] The flange portion 28 protrudes from the lens body portion 27 in a radial direction centered on the optical axis La, and extends over the entire circumference in the circumferential direction centered on the optical axis La. The flange portion 28 can be fitted into the projection lens groove 15 e of the casing 15 . When the flange portion 28 is fitted into the projection lens groove 15e, the extending direction of the lens axis of the projection lens 14 coincides with the optical axis La.
[0041] The heat dissipation member 16 is a heat dissipation member that dissipates heat generated by the light source 21 to the outside, and is formed of thermally conductive aluminum die-casting or resin. This heat radiation member 16 has a light source installation part 16a in which the light source part 11 (its board|substrate 22) is provided, and several heat radiation fins 16b. The heat dissipation member 16 radiates heat generated by the light source unit 11 provided in the light source installation portion 16a to the outside from each heat dissipation fin 16b.
[0042] refer to figure 2 , the vehicle lamp 10 is assembled as follows. First, the light source 21 is mounted on the substrate 22 to assemble the light source unit 11 , and the light source unit 11 is fixed to the light source installation portion 16 a of the heat dissipation member 16 . After that, in the lower part 15a of the housing 15, the condenser lens 12 is inserted into the condenser lens groove 15c, the filter 13 is inserted into the filter groove 15d, and the projection lens 14 is inserted into the projection lens groove 15e. middle. In addition, in a state where the emission optical axis of the light source 21 is aligned with the optical axis La, the substrate 22 is housed in the rear end portion of the lower member 15a of the case 15, and the heat dissipation member 16 is fixed to the rear end of the lower member 15a. The light source setting part 16a. Thereafter, the upper member 15b is fitted to the upper side of the lower member 15a, the light source unit 11, the condenser lens 12, the filter 13, and the projection lens 14 are accommodated in the case 15, and the heat dissipation member 16 is attached. Thus, on the optical axis La of the light source 21 of the light source unit 11, the condensing lens 12, the filter 13, and the projection lens 14 are arranged in the order from the light source 21 side, arranged in a predetermined positional relationship, and in the light source unit 11, the heat dissipation member 16 is fixed, and the vehicle lamp 10 is assembled.
[0043] This vehicular lamp 10 is installed in a lamp house in a state in which the optical axis La faces obliquely front outside the vehicle 1 and is inclined with respect to the road surface 2 around the vehicle 1 (see figure 1 ). The vehicle lamp 10 supplies electric power from the lighting control circuit to the light source 21 from the substrate 22 , whereby the light source 21 can be properly turned on and off. The light from the light source 21 is condensed by the condensing lens 12 to irradiate the filter 13, and after being transmitted through the irradiation slit 25 (each slit portion 26), it is projected by the projection lens 14, thereby forming a spot on the road surface 2. Four irradiation patterns Pi of the irradiation patterns Di are arranged approximately on a straight line.
[0044] Next, use Figure 4 to Figure 7 The optical setting of the condenser lens 12 will be described. in the Figure 7 Among them, the darker the color, the brighter it is, and the darker it is, the lighter it is. First, the condensing lens 12 basically condenses the light from the light source 21 to illuminate the set range Sr in the filter 13 (refer to image 3 )Inside. In Example 1, the setting range Sr is set to the range where both the right side filter 13R and the left side filter 13L are provided with the irradiation slits 25 (the respective slit portions 26 ), that is, The range of the irradiation slit 25 covering the left and right filters 13R, 13L. The setting range Sr is set to an approximately elliptical shape centered on the optical axis La (see Figure 7 ), and the condensing lens 12 is also set in a substantially elliptical shape centered on the optical axis La corresponding to the setting range Sr. In addition, the setting range Sr only needs to be set in a shape corresponding to the shape of the irradiation slit 25, and the condenser lens 12 also needs to be set in a shape corresponding to the setting range Sr, and is not limited to Embodiment 1. Structure. Hereinafter, a direction perpendicular to the optical axis La is referred to as a radial direction.
[0045] like Figure 4 As shown, the condenser lens 12 makes the light from the light source 21 pass through the vicinity of the optical axis La in the radial direction between the exit surface 12b and the filter 13 in the cross section including the optical axis direction and the width direction. The light beams are diffused, and the light beams passing through positions away from the optical axis La in the radial direction are parallelized. That is, the condensing lens 12 diffuses light near the optical axis La having a Lambertian distribution and has a high light intensity, and condenses the light as it goes outward from the vicinity of the optical axis La. Therefore, the condensing lens 12 diffuses the light from the light source 21 substantially uniformly so as to have a substantially equal light quantity distribution within the setting range Sr of the filter 13 in the cross section, that is, the width direction.
[0046] like Figure 5 and Image 6 As shown, the condensing lens 12 is a free-form surface composed of an upper lens portion 31 and a lower lens portion 32 in the vertical direction centered on the optical axis La. like Figure 5 As shown, the upper lens portion 31 condenses the light from the light source 21 so as to intersect the optical axis La in a longitudinal section including the optical axis direction and the vertical direction. The upper lens unit 31 makes at least light beams near the optical axis La out of the light from the light source 21 intersect the optical axis La between the filter 13 and the projection lens 14 closer to the filter 13 than other light beams. Furthermore, the upper lens unit 31 makes most of the light beams, except the light beams near the optical axis La, intersect the optical axis La after passing through the projection lens 14 . In addition, the upper lens unit 31 only needs to make at least light beams near the optical axis La intersect the optical axis La on the side closer to the filter 13 than other light beams between the filter 13 and the projection lens 14. The beam of light may also intersect the optical axis La before or after the projection lens 14 . As a result, the upper lens portion 31 uniformly diffuses the light from the light source 21 that has passed through itself in the vertical direction at a position above the optical axis La in the set range Sr, and the closer to the optical axis in the radial direction. La gathers more light. In addition, in Figure 5 In , although it can be seen that more light beams are collected on the upper side, this is because the light beams from the light source 21 are described according to the shape of the condenser lens 12. In fact, the closer to the optical axis La, the more light beams are collected by the above-mentioned settings. more light.
[0047] like Image 6 As shown, in the above-mentioned longitudinal section, the lower lens portion 32 condenses the light from the light source 21 so as to intersect the optical axis La. The lower lens portion 32 makes the light beam from the light source 21 that has passed through the position farthest from the optical axis La in the radial direction be between the filter 13 and the projection lens 14 on the side closest to the filter 13 and the optical axis La. intersect. That is, the lower lens portion 32 intersects the light beam passing through the position furthest from the optical axis La among the light from the light source 21 to intersect the optical axis La at the front, and the closer the light beam to the optical axis La is, the farther the light beam is from the filter 13. The position intersects the optical axis La. Further, the lower lens unit 32 makes most of the light beams including the light beams near the optical axis La intersect the optical axis La between the filter 13 and the projection lens 14 . In addition, as long as the lower lens unit 32 makes at least the light beam passing through the position farthest from the optical axis La intersect the optical axis La between the filter 13 and the projection lens 14, other light beams may also be projected. The front or back of the lens 14 may intersect the optical axis La. As a result, the lower lens portion 32 uniformly diffuses the light from the light source 21 that has passed through itself in the vertical direction at a position below the optical axis La in the set range Sr, and further away from the optical axis La in the radial direction. The more light is gathered.
[0048] The condensing lens 12 is set by setting the above-mentioned optical properties, such as Figure 7 As shown, the light from the light source 21 that has passed through itself is irradiated with the filter 13 (in the illustrated example, the filter 13L for the left side) within the set range Sr. In this setting range Sr, by setting the condenser lens 12 (the upper lens portion 31 and the lower lens portion 32 thereof) in the vertical direction, the first slit at the farthest position in the vertical direction The portion 261 is the brightest, and the fourth slit portion 264 at the closest position is the darkest, and the brightness gradually changes in the order of the first to fourth slit portions 261 , 262 , 263 , and 264 . That is, in the up-down direction of the condensing lens 12, the position where the first slit portion 261 is provided as the farthest position is made the brightest (as a peak), and gradually becomes darker as it moves away from this position. The light irradiation setting range Sr. Therefore, by condensing the light from the light source 21, the condensing lens 12 separates the optical axis so that the farthest position is brightest and the closest position is darkest in the longitudinal section of the filter 13, that is, in the vertical direction. La gradually changes the brightness.
[0049]In addition, in the setting range Sr, the luminance in the width direction is substantially uniform at each position in the vertical direction of each slit portion 26 by setting the cross section (width direction) of the condenser lens 12 . That is, the condensing lens 12 spreads in the width direction so that there is no brightness difference compared with the vertical direction, and irradiates the set range Sr with light from the light source 21 . Furthermore, since the setting range Sr is set as described above, even when either of the left and right filter parts 13R, 13L is used, the irradiation slit 25 (each slit part 26 ) can be illuminated with the same beam distribution. Irradiate. Light having such a light beam distribution transmitted through the optical filter 13 , that is, each slit portion 26 is projected onto the road surface 2 through the projection lens 14 .
[0050] Next, use Figure 8 The optical setting of the projection lens 14 will be described. exist Figure 8 Among them, (a) shows the case of shooting from a radial position of 6 mm, (b) shows the case of shooting from a radial position of 4 mm, and (c) shows the case of shooting from a radial position of 2 mm. like Figure 8 As shown, the lens body portion 27 (projection lens 14) is set with a focal plane Fp. The focal plane Fp is a position in the direction of the optical axis on which the optical filter 13 is provided (a surface indicated by reference numeral 13 ), and a radial position separated from the optical axis La in the radial direction by a predetermined distance from the optical axis La. The surface where the point where the parallel light of d is concentrated. The radial position d is a position in all the radial directions up, down, left, and right with respect to the optical axis La, and the lens body portion 27 is set in the same manner in any direction perpendicular to the optical axis La. The lens body portion 27 is set such that the radius of curvature r of the focal plane Fp decreases as the radial position d increases, that is, the curvature of the focal plane Fp increases. Moreover, the lens body portion 27 is located on the opposite side to the optical filter 13 with respect to the focal plane Fp regardless of the radial position d. Figure 8 The central focal plane Fp left side) sets the center of curvature Cc (described at the top and the middle), and the focal plane Fp is convex toward the projection lens 14 side. That is, even if the radial position d of the lens main body portion 27 changes, the convex direction of the focal plane Fp does not reverse.
[0051] As an example, the lens body portion 27 of the first embodiment sets the focal plane Fp as follows. like Figure 8 As shown at the top of , for parallel light emitted from the radial position d of 6 mm and the optical axis La, the lens body 27 sets the radius of curvature r of the focal plane Fp to about 7 mm. Additionally, if Figure 8 As shown in the middle of , for the parallel light emitted from the radial position d of 4 mm and the optical axis La, the lens body 27 sets the radius of curvature r of the focal plane Fp to about 14 mm. and, if Figure 8 As shown at the bottom of , for the parallel light emitted from the radial position d of 2 mm and the optical axis La, the lens main body 27 sets the radius of curvature r of the focal plane Fp to about 128 mm. In addition, the lens main body 27 may be configured so that the radius of curvature r of the focal plane Fp decreases as the radial position d increases, and the value of the radius of curvature r with respect to the radial position d may be appropriately set, and It is not limited to the structure of Example 1. In particular, the lens body portion 27 sets the above-mentioned focal plane Fp (radial direction) at a position (outside the paraxial region) where the radial position d is larger than the paraxial region (the radial position d is smaller than 2 mm in Embodiment 1). The relationship between position d and radius of curvature r). Thereby, compared with the case of setting on the entire surface including the paraxial region, the lens main body 27 can sharpen the outline of the irradiation pattern Pi with little change, suppress blurring, and perform efficient optical setting.
[0052] This projection lens 14 projects through the irradiation slit 25 (each slit portion 26) of the optical filter 13 of the above-mentioned beam distribution, as Figure 9 and Figure 10 As shown, an irradiation pattern Pi is formed. Figure 9 represents the irradiation pattern Pi formed on the screen arranged perpendicular to the optical axis La, Figure 10 Indicates the irradiation pattern Pi formed on the road surface 2 inclined with respect to the optical axis La. The illumination pattern Pi is well-defined on the screen and blurring is suppressed. This is because the influence of field curvature of the projection lens 14 can be reduced by setting the projection lens 14 (lens body portion 27 ) as described above.
[0053] In addition, the outline of the irradiation pattern Pi is also sharp on the road surface 2, and blurring is prevented. This is because, by setting the projection lens 14 (lens body 27 ) as described above, the influence of the distance change from the road surface 2 due to the inclination of the road surface 2 with respect to the optical axis La can be reduced.
[0054] In particular, in the vehicle lamp 10 of the first embodiment, since the light source 21 is monochromatic light, the influence of chromatic aberration in the projection lens 14 can be significantly suppressed. Therefore, the projection lens 14 can form the irradiation pattern Pi with a sharp outline and suppressed blurring.
[0055] The irradiation pattern Pi is on the road surface 2, and each irradiation pattern Di is Figure 11 The brightness value shown. Figure 11 Indicates the luminance value near the apex of the V-shape in each irradiation pattern Di. In addition, in Figure 11 In , it is generally known that the feeling of brightness is proportional to the logarithm of the brightness, so the brightness value on the vertical axis is set as the logarithm. like Figure 11 As shown, the illumination pattern Pi is set to make the first illumination pattern Di1 farthest from the vehicle 1 the darkest, and make the fourth illumination pattern Di4 the closest to the vehicle 1 the brightest, and the change in brightness is relative to the distance from the vehicle 1 The degree of change is logarithmic linear. That is, in the irradiation pattern Pi, the irradiation patterns Di are arranged at equal intervals, and the luminance is linear in the order of the first irradiation pattern Di1, the second irradiation pattern Di2, the third irradiation pattern Di3, and the fourth irradiation pattern Di4. get bigger.
[0056] In order to demonstrate the effect, a vehicle lamp of a comparative example is used. The vehicular lamp of this comparative example has the same structure as the vehicular lamp 10, and the setting range Sr of the filter 13, that is, each slit portion is irradiated with the same brightness by the light from the light source 21 passing through the condenser lens 12. 26. Regarding the vehicular lamp of the comparative example, when projected onto the road surface 2, the third illumination pattern Di3, the second illumination pattern Di2, and the first illumination pattern Di1 become darker in order from the fourth illumination pattern Di4 at the closest position. It is the same as the vehicle lighting device 10 of the first embodiment, but the change is not linear, but becomes darker rapidly when approaching the farthest position (first irradiation pattern Di1). This is because, in the irradiation pattern Pi projected by the projection lens 14 , the luminance changes in proportion to the square of the distance from the projection lens 14 to the projection surface (the road surface 2 in this example). Therefore, in the vehicular lamp of the comparative example, the visibility at the farthest position (first illumination pattern Di1 ) deteriorates, and the sudden change in luminance gives a sense of discomfort to the viewer.
[0057] On the other hand, in the vehicle lamp 10 of the first embodiment, the setting range Sr of the filter 13 is set according to the first to fourth slits so that the first slit 261 is the brightest and the fourth slit 264 is the darkest. The order of the slits 261 , 262 , 263 , and 264 gradually changes brightness, and the filter 13 is irradiated with light from the light source 21 . That is, contrary to the brightness of each illumination pattern Di of the illumination pattern Pi, the vehicle lamp 10 makes the first slit portion 261 corresponding to the first illumination pattern Di1 at the furthest position the brightest, and makes the fourth illumination pattern Di1 at the closest position the brightest. The fourth slit portion 264 corresponding to Di4 is the darkest. Therefore, the vehicular lamp 10 can alleviate the sudden change in the brightness caused by the change in the distance projected on the road surface 2 through the projection lens 14 by setting the brightness in the filter 13, and can make the brightness of each irradiation pattern Di The change is linear. Therefore, the vehicle lamp 10 can ensure the visibility at the farthest position (the first illumination pattern Di1 ), and can suppress the uncomfortable feeling given to the viewer due to the linear change in luminance.
[0058] Next, use Figure 12 The operation of the vehicle lamp 10 will be described. The vehicular lamp 10 is linked with the turn signals, and when any one of the left and right turn signals is turned on, the light source 21 provided on the side to be turned on is turned on to form an illumination pattern Pi on the road surface 2 . For example, in Figure 12 In the illustrated example, a scene in which the vehicle 1 coming out of an alley with poor visibility is about to turn left is shown. In the vehicle 1 , the vehicle lamp 10 installed on the left front forms an illumination pattern Pi on the road surface 2 by blinking the left turn signal lamp. Therefore, a positive observation Figure 12 On the other hand, even if the driver of the vehicle 1A approaching from the right cannot visually recognize the vehicle 1 , he can visually recognize the irradiation pattern Pi formed on the road surface 2 .
[0059] In addition, since the left and right vehicular lamps 10 of the vehicle 1 are linked with the turn signals, when the hazard lights are turned on, the left and right vehicular lamps 10 simultaneously form the irradiation pattern Pi on the road surface 2 (see figure 1 ). Therefore, compared with the case where only the left and right turn signals are blinked, the vehicle lighting device 10 can allow people around the vehicle 1 to more reliably recognize that the hazard lamps are turned on.
[0060] The vehicle lamp 10 of the first embodiment can obtain the following effects.
[0061] The vehicle lamp (10) is equipped with: a condenser lens (12), which condenses the light emitted from the light source (21); an illumination slit (25) through which light is partially transmitted; and a projection lens (14) that projects light passing through the filter (13) to form an illumination pattern (Pi). Moreover, in the vehicular lamp 10, the condenser lens 12 is on the filter 13, and makes the farthest position of the irradiation slit 25 the brightest and the darkest at the nearest position of the irradiation slit 25 in the up-down direction, and the width The direction diffuses the light emitted from the light source 21 more than the vertical direction. Therefore, the vehicular lamp 10 can moderate a sudden change in brightness caused by a change in the distance from the projection lens 14 to the projection surface by setting the brightness in the filter 13 . Thus, even when the vehicular lighting device 10 is installed with the optical axis La inclined relative to the road surface 2, it is possible to set the luminance on the filter 13 by the condensing lens 12 so that the light in the irradiation pattern Pi The luminance distribution becomes a desired distribution. Furthermore, the vehicular lamp 10 makes the irradiation pattern Pi have a desired luminance distribution by the condenser lens 12 composed of the single incident surface 12a and the exit surface 12b and the projection lens 14 composed of the single exit surface 27b and the incident surface 27a, Therefore, it is possible to have a simple structure.
[0062] In addition, the irradiation pattern Pi of the vehicle lamp 10 has a plurality of arranged irradiation patterns Di, and the irradiation slit 25 has slit portions 26 respectively corresponding to the irradiation patterns Di. Therefore, by setting the luminance of each slit portion 26 using the condensing lens 12 in the vehicular lamp 10 , each illumination pattern Di can be set to a desired luminance, and the visibility of the illumination pattern Pi can be improved.
[0063] Further, the condensing lens 12 of the vehicle lamp 10 diffuses the light from the light source 21 within a set range Sr in which the slit 26 is formed on the filter 13 in the width direction. Therefore, in the vehicle lighting device 10, as long as it is within the set range Sr, for example, a light emitting slit 25 (each slit portion 26) provided in a plane-symmetrical manner with a plane perpendicular to the width direction of the first embodiment is used. Like the left and right filters 13, even if the position of each slit portion 26 is changed, the same beam distribution can be obtained. As a result, the vehicle lamp 10 has a simple structure and can improve versatility.
[0064]In the irradiation slit 25 of the vehicle lamp 10 , the closest position is the upper side and the farthest position is the lower side, and the plurality of slit portions 26 are arranged in the vertical direction. In addition, in the vehicle lamp 10, the slit portion 26 becomes smaller from the closest position to the farthest position, and the number of positions located on the lower side of the optical axis La is smaller than the number of positions located on the upper side of the optical axis La. many. Further, the vehicle lighting device 10 is constituted by an upper lens portion 31 and a lower lens portion 32 in the vertical direction. In addition, in the vehicle lamp 10, the upper lens portion 31 makes at least the light beam in the vicinity of the optical axis La intersect the optical axis La between the slit portion 26 and the projection lens 14, and the lower lens portion 32 makes the light beam passing through the farthest The light flux at the position of the optical axis La intersects the optical axis La on the side closest to the slit portion 26 between the slit portion 26 and the projection lens 14 . Therefore, even when the optical axis La is installed at an inclination with respect to the road surface 2 , the vehicular lighting device 10 can set the plurality of illumination patterns Di to have the same size and have desired luminance. In addition, since the vehicular lighting device 10 has more slits 26 on the lower side of the farthest position than on the upper side of the closest position, all the slits 26 can be included in a radially equal range from the optical axis La. The slit 26 can efficiently use the light from the light source 21 .
[0065] In the projection lens 14 of the vehicular lamp 10 , the radius of curvature of the focal plane Fp with respect to the parallel light from the filter 13 decreases radially away from the vicinity of the optical axis La. Therefore, even when the optical axis La of the vehicular lamp 10 is installed so as to be inclined with respect to the road surface 2, the influence of field curvature of the projection lens 14 can be reduced, and the filter 13 (irradiation slit 25 (each slit portion) 26)) is projected onto the road surface 2 to form an illumination pattern Pi on the road surface 2 with sharp outlines and suppressed blurring.
[0066] The focal plane Fp of the vehicle lamp 10 has a center of curvature Cc set on the side opposite to the optical filter 13 regardless of the distance in the radial direction from the optical axis La. Therefore, even when the optical axis La is provided inclined with respect to the road surface 2 , the vehicular lighting device 10 can form an illumination pattern Pi on the road surface 2 with a sharper outline and further suppressed blurring.
[0067] Therefore, the vehicular lamp 10 according to the first embodiment of the vehicular lamp according to the present disclosure can have a simple structure and can make the luminance distribution in the irradiation pattern Pi a desired distribution.

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