Vehicle lighting fixture

Abstract

To provide a vehicle lighting fixture that improves a reduction in visibility on a long wavelength side of light caused by the Purkinje phenomenon.SOLUTION: Light emission control means 6 includes a white light control part 611 that controls a color temperature of white light by increasing a spectral power on a long wavelength side within a sensitivity range of an occupant's relative luminosity when the Purkinje phenomenon occurs. Purkinje detection means 67 detects a wavelength of a color that the occupant can distinguish, detects the occupant's relative luminosity based on this wavelength, and outputs it as relative luminosity information. The light emission control means 6 includes a storage part 612 that stores the detected relative luminosity information. When the Purkinje phenomenon occurs, the W (white light) control part 611 controls a light emission of a light source (main light source 41) of a lamp unit 1 based on the relative luminosity information stored in the storage part 612.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a vehicle lamp, and more particularly to a vehicle lamp suitable for use as a headlamp of an automobile. [Background technology]

[0002] Proposed headlamps solve the problems associated with the so-called Purkinje phenomenon, a phenomenon in which visibility changes due to changes in the external environment in vehicles such as automobiles. The Purkinje phenomenon is a phenomenon in which the relative luminosity of the human eye shifts to the short wavelength side (blue light side) at twilight, night, etc. Patent Document 1 proposes a technology that reduces glare caused by the short wavelength spectral component (blue light component) of the headlamp illumination light based on detected external environmental information when the Purkinje phenomenon occurs. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7170950 Summary of the Invention [Problem to be solved by the invention]

[0004] The Purkinje phenomenon reduces the relative luminosity on the long wavelength side, so the visibility of red road signs is reduced. In particular, red road signs are often regulatory signs, and are important for ensuring safe traffic. The technology of Patent Document 1 weakens the spectral components on the short wavelength side to suppress the glare caused by the Purkinje phenomenon, but does not take into consideration the visibility on the long wavelength side. Therefore, the issue of reduced visibility of red road signs remains.

[0005] In addition, the control in the cited document 1 is performed uniquely based on the external environment. That is, the control is performed based on a person with a standard relative luminosity. Therefore, there is a problem that such unique control is not necessarily suitable for people with different relative luminosity, for example, young people and elderly people, who have different relative luminosity when the Purkinje phenomenon occurs.

[0006] An object of the present invention is to provide a vehicle lamp that improves the decrease in visibility due to the Purkinje phenomenon, particularly the decrease in visibility on the long wavelength side of light. [Means for solving the problem]

[0007] The present invention is a vehicle lamp having a light source capable of correcting the color temperature of emitted light, characterized in that it includes a light emission control means for controlling to increase the spectral power on the long wavelength side within the sensitivity range of the relative luminosity of an occupant when the Purkinje phenomenon occurs. For example, it includes a detection means for detecting the wavelength of a color that the occupant can distinguish when the Purkinje phenomenon occurs, detecting the relative luminosity of the occupant based on this wavelength, and outputting the detected relative luminosity information. The light emission control means also includes a storage means for storing the detected relative luminosity information, and controls light emission based on the relative luminosity information stored in the storage means when the Purkinje phenomenon occurs.

[0008] Furthermore, an occupant recognition means is provided for recognizing occupants, and the memory means stores the recognized occupants in association with the individual relative visibility information of each occupant, and when an occupant is recognized by the occupant recognition means, the light emission control means controls the light emission based on the individual relative visibility information linked to the recognized occupant.

[0009] In the present invention, it is preferable that the light emission control means obtains a deviation, which is a deviation amount in the wavelength direction between standard relative luminosity information standardized based on a predetermined number or more of relative luminosity information and the individual relative luminosity information of each detected occupant, and performs control to vary the amount of spectral power to be increased according to the value of this deviation. In this case, it is preferable to reduce the increase value of the spectral power on the long wavelength side when the individual relative luminosity information is deviated to the long wavelength side from the standard relative luminosity information, and to increase the increase value of the spectral power on the long wavelength side when the individual relative luminosity information is deviated to the short wavelength side. Effect of the Invention

[0010] According to the present invention, when the Purkinje phenomenon occurs, the spectral power on the long wavelength side within the sensitivity range of the relative luminosity of the occupant is increased to correct the color temperature of the emitted light, thereby improving the decrease in visibility on the long wavelength side caused by the Purkinje phenomenon and improving visibility. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic perspective view of an automobile equipped with a vehicle lamp (front lamp) according to the present invention. [Diagram 2] FIG. 2 is an enlarged longitudinal sectional view of the front lamp taken along line AA in FIG. 1; [Diagram 3] FIG. 2 is a schematic exploded perspective view of a front lamp. [Figure 4] FIG. 2 is a vertical cross-sectional view of a main portion of the high beam lamp unit. [Diagram 5] FIG. 2 is an exploded perspective view of a portion of the high beam lamp unit. [Figure 6] Block diagram of the front lamp electrical system. [Figure 7] Conceptual diagram of a P detection device. [Figure 8] (a) is a graph showing the relative luminous efficiency characteristics, and (b) is a graph showing the spectral characteristics of white light. [Figure 9] 5A and 5B are schematic characteristic diagrams for explaining visibility, in which (a) is in normal operation, (b) is during the Purkinje phenomenon, and (c) is an embodiment. [Figure 10] Schematic characteristic diagram explaining individual differences in the Purkinje phenomenon. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an automobile CAR equipped with a vehicle lamp of the present invention, seen from the front. This vehicle lamp is configured as a front lamp FL of an automobile, and is configured as a modular lamp configured from an area corresponding to the automobile's front grille to an area extending in the left-right direction along the front edge of the automobile's front hood. The former area corresponding to the front grille is configured as a high beam lamp HiL that also serves as a display device (display) DP and irradiates light with a high beam distribution. The latter area is configured as a clearance lamp CL that also serves as a daytime running lamp, and a low beam lamp LoL that irradiates light with a low beam distribution.

[0013] Fig. 2 is a vertical cross-sectional view taken along line AA in Fig. 1, and Fig. 3 is a schematic perspective view of the main parts of the front lamp FL exploded. As described above, the front lamp FL is formed from the central region corresponding to the front grille to the upper side region along the front hood, and is provided with a lamp housing 100 composed of a lamp body 101 fixed and supported on the front part of the body of the automobile CAR, and a light-transmitting outer lens 102 fixed to the lamp body 101 so as to cover the front side of the lamp body 101.

[0014] A clearance lamp unit 2 extending along the vehicle width direction is disposed in the upper side region of the lamp housing 100. The clearance lamp unit 2 includes a long and narrow light guide (light guide) 21 extending in the vehicle width direction, and a plurality of white LEDs 22 emitting white light as a light source disposed adjacent to the light guide 21. When the white LEDs 22 emit light, the white light emitted from the white LEDs 22 is guided in the extension direction within the light guide 21, and while being further guided, is emitted from the side surface of the light guide 21 facing forward. Thus, the clearance lamp unit 2 functions as a clearance lamp CL having a linear lamp light emitting surface extending in the left-right direction along the front edge of the front hood, or as a daytime running lamp.

[0015] Further, low beam lamp units 3 are disposed in the left and right regions of the upper side of the lamp housing 100, that is, on the lower side of each of the left and right ends of the light guide 21. Although the low beam lamp units 3 can be of an existing lamp configuration, it is preferable that the lamp configuration has a small vertical dimension. For example, although not shown, the low beam lamp is configured as a projector-type lamp having a white LED as a light source, a reflector that reflects the white light emitted from the white LED in a concentrated state, and an irradiation lens that irradiates the white light reflected and concentrated by the reflector. In addition, a shade is disposed between the reflector and the projection lens to block a part of the irradiated light, thereby functioning as a low beam lamp LoL that irradiates light with a low beam distribution having a required cutoff line.

[0016] Meanwhile, a high beam lamp unit 1 that functions as a high beam lamp HiL that also serves as a display device DP is disposed in the central region within the lamp housing 100. As shown in schematic diagrams in Figures 2 and 3, this high beam lamp unit 1 includes a light source board 4 on which a light source is mounted, and an irradiation optical system 5 that controls the light emitted by the light source and irradiates the light with a required light distribution or light pattern. The light source board 4 and the irradiation optical system 5 are integrally assembled to constitute the high beam lamp unit 1.

[0017] Fig. 4 is a cross-sectional view of the main part of the high beam lamp unit 1, and Fig. 5 is an exploded perspective view of a part thereof. The light source board 4 is composed of a flat wired circuit board, and is installed in a substantially vertical direction within the lamp housing 100. On the front surface of the light source board 4, i.e., the elevation surface facing the front of the automobile, a number of light-emitting elements are mounted as light sources, here a main LED (light-emitting diode) 41 and a sub-LED 42, arranged in a regular matrix. The light emission of each of these LEDs 41, 42 is selectively controlled by a light emission control device 6 that is configured to include electronic components mounted on the light source board 4.

[0018] The main LED 41 and the sub LED 42A are composed of full-color LEDs. This full-color LED 42A is an integrated package of LED chips that emit red, green, and blue light, which are not shown in the figure, and by controlling the light emission brightness of each LED chip, it is possible to emit light of various hues as well as any color light that is a mixture of these lights, that is, white light. In the case of white light, it is possible to control the color temperature of the white light by changing the light emission intensity of the LED chips of each color.

[0019] On the other hand, the irradiation optical system 5 is composed of an inner lens 50. This inner lens 50 is formed based on a translucent resin plate having approximately the same vertical and horizontal dimensions as the light source substrate 4 and is provided with a plurality of lenses, of which a main lens 51 and a secondary lens 52 are integrally formed.

[0020] The main lens 51 is formed as a convex lens having a required focal length, and is disposed at a position facing the light emitting surface of the main LED 41 mounted on the light source substrate 4. The optical axis Lx1 of this main lens 51 is perpendicular to the light emitting surface of the main LED 41, and its focal point approximately coincides with the center position of the light emitting surface of the main LED 41. A concave spherical light entrance portion 51i is formed in a portion of this main lens 51 facing the main LED 41, and the light of the main LED 41 incident on this light entrance portion 51i is emitted from a light exit portion 51o on the front side of the main lens 51 as a nearly parallel light flux (light beam).

[0021] The secondary lens 52 is a convex lens with a focal length somewhat longer than that of the primary lens 51, and is disposed between the primary lenses 51, i.e., in a portion facing the secondary LED 42. The optical axis Lx2 of the secondary lens 52 is perpendicular to the light emitting surface of the secondary LED 42 and is positioned approximately in the center of the light emitting surface. In this secondary lens 52, the light of the secondary LED 42 incident on the concave spherical light entrance portion 52i is emitted from the light exit surface 52o as a somewhat diverged light flux.

[0022] Therefore, when the high beam lamp unit functions as a high beam lamp, white light is emitted from the main LED and is emitted from the main lens as a nearly parallel light beam. This allows light to be irradiated with a high beam distribution. Also, when the high beam lamp unit functions as a display device, light of any color emitted from the sub LED 42 is emitted in a divergent state by the sub lens 52. This allows the required pattern to be displayed by the light from each sub LED. At this time, the spread angle of the light emitted from the outer lens 102 becomes large, ensuring the wide angle of view required for a display device.

[0023] 6 is a block diagram of the electrical system of the front lamp FL described above. Each light source of the clearance lamp unit 2, the low beam lamp unit 3, and the high beam lamp unit 1 is electrically connected to a light emission control device 6, and the light emission of each light source is controlled by this light emission control device 6. The light emission control device 6 is equipped with a Hi (high beam lamp) control unit 61, a CL (clearance lamp) control unit 62, and a Lo (low beam lamp) control unit 63, and these control units 61 to 63 control the light emission of the corresponding lamp units 1, 2, and 3. Here, the Hi control unit 61 is connected to the main LED 41 of the high beam lamp unit 1, and the light emission of the main LED 41 is controlled by this Hi control unit 61.

[0024] The Hi control unit 61 also includes a W (white light) control unit 611 capable of varying and controlling the spectral characteristics of the white light emitted from the main LED 41, and a storage unit 612 for storing required information. The W control unit 611 can vary the luminous intensity ratio of the emitted luminous intensity when each of the red, green, and blue LED chips of the main LED 41 emits light, thereby controlling the color temperature of the white light emitted from the main LED 41. For example, the control is performed to produce bluish white light, yellowish white light, reddish white light, or the like. This control can be performed while keeping the total amount of emitted white light constant, or within a predetermined range of light amount.

[0025] The light emission control device 6 further includes a DP (display) control section 64. The sub-LEDs 42 of the high beam lamp unit 1 are connected to this DP control section 64, and the light emission of each of them is controlled. When a predetermined signal is input from the outside, the DP control section 64 selectively controls the light emission of the sub-LEDs 42 in response to the signal, thereby synthesizing the colored lights emitted from the sub-LEDs 42 that have selectively emitted light, controlling the light emission color of the corresponding pixel, and forming a display pattern such as a picture composed of a plurality of pixels. This control of the light emission color is performed by controlling the light emission color of each of the red, green, and blue LED chips, as in the case of the main LED 41.

[0026] Each of the control units 61 to 64 is connected to an interface unit 60, which is connected to a switch 65 operated by a passenger to control the on / off of each of the lamp units 1, 2, and 3. Also connected to the interface unit 60 are various sensors 66 for detecting the external environment of the vehicle, which include an illuminance sensor for detecting the brightness outside the vehicle. This illuminance sensor can be said to be a sensor that detects a situation in which the pre-energetic phenomenon occurs by detecting twilight or nighttime.

[0027] Furthermore, a P (Purkinje) detector 67 is connected to detect the relative visibility of a passenger driving the automobile, particularly the relative visibility under normal conditions and the relative visibility when the pre-enk phenomenon occurs. This P detector 67 is configured by utilizing a display device mounted on the dashboard of the automobile CAR, such as the display of a car navigation device, as will be described later with reference to Fig. 7. An imaging device for imaging a passenger seated in the driver's seat of the automobile may also be connected to the light emission control device 6, and an example in which a camera 68 is connected is shown here.

[0028] In the front lamp FL configured as described above, the light emission of the clearance lamp unit 2 and the low beam lamp unit 3 is controlled by the occupant operating the switch 65. By controlling the light emission of these lamp units 2, 3, they function as clearance lamps CL or as low beam lamps LoL that provide illumination with a low beam light distribution, but a detailed description thereof will be omitted here.

[0029] Also, the light emission of the high beam lamp unit 1 is controlled by operating the switch 65, and the high beam lamp unit 1 functions as a high beam lamp HiL or as a display device DP. When the switch 65 is controlled as a high beam lamp, the Hi control unit 61 causes only the main LED 41 to emit light. The white light emitted from the main LED 41 is emitted as a nearly parallel light beam by the main lens 51, passes through the outer lens 102, and is irradiated toward the front of the automobile CAR. This light additionally illuminates the upper area of ​​the low beam distribution, and illumination with high beam distribution is performed. Furthermore, road signs are illuminated by this illumination with high beam distribution, allowing the occupants to visually recognize the road signs.

[0030] In the embodiment, the high beam lamp unit 1 has a lamp light emitting surface wider than that of a general high beam lamp provided conventionally, and a large number of main LEDs 41 are arranged. Therefore, in order to satisfy the brightness required for a high beam lamp, the brightness of each main LED 41, that is, the luminous intensity per unit area, can be reduced. As a result, when the high beam lamp unit 1 functions as a high beam lamp HiL, the lamp light emitting surface is less likely to be glare when observed from the outside.

[0031] When the switch 65 is controlled as the display device DP, the DP control unit 64 causes only the sub-LED 42 to emit light. Each of the white, red, green and blue lights emitted from the sub-LED 42 is emitted as a luminous flux that is somewhat diverged by the sub-lens 52, passes through the outer lens 102 and is irradiated toward the front of the automobile CAR. By controlling the emission color of each of the sub-LEDs 42 arranged in a matrix, a light pattern such as a required picture or character is displayed on the front of the high beam lamp unit 1, and the display can be visually recognized by people outside.

[0032] If the Purkinje phenomenon occurs at twilight or night when the high beam lamp unit 1 functions as a high beam lamp HiL, the luminosity of the occupants shifts to the short wavelength side, resulting in reduced visibility of red road signs. That is, the luminosity of humans has a characteristic of peaking at a desired wavelength and gradually decreasing toward the long and short wavelength sides, as shown by the solid line R1 in FIG. 8(a). When the Purkinje phenomenon occurs, this luminosity shifts to the short wavelength side, as shown by the dashed line R2. The amount of this shift varies slightly from person to person.

[0033] The spectral characteristics of the white light from a typical automobile headlamp that uses an LED as the light source are W1, which has peaks in the blue region and in the yellow to red region, as shown in the schematic diagram of Fig. 8(b). Therefore, when viewing with the white light from the headlamp when the Purkinje phenomenon is not occurring, as shown in Fig. 9(a), the white light W1 is viewed with a relative luminous efficiency R1, and the region A1, which mainly ranges from yellow to red, can be viewed as dotted in the figure. Therefore, it is possible to view the blue to red region.

[0034] When the Purkinje phenomenon occurs, as shown in Figure 9(b), white light W1 is perceived with relative luminosity R2, and the area A2, which ranges from blue to yellow, is perceived as dotted in the figure. In other words, the visibility of the blue area increases, but the visibility of the red area decreases. Therefore, the Purkinje phenomenon increases the visibility of blue road signs, but decreases the visibility of red road signs. Red road signs are often regulatory signs, which is undesirable from the perspective of traffic safety.

[0035] In this embodiment, the relative luminosity R1 of the occupant when the Purkinje phenomenon does not occur and the relative luminosity R2 when the Purkinje phenomenon occurs are detected by a simple method. The P detection device 67 connected to the light emission control device 6 displays a band-shaped color chart CC, the color of which changes from blue to red according to the change in wavelength, on the screen of the display device, as shown in the conceptual diagram of Fig. 7, for example. Here, the color chart CC is displayed on the touch panel type display screen of the car navigation system NAV.

[0036] Then, during normal times when the Purkinje phenomenon does not occur, the wavelength λn at the discrimination limit level L (see FIG. 8(a)) at which it becomes impossible to accurately discriminate the hue of a color on the long wavelength side is detected, and this is taken as the Pn wavelength information. In this example, on the display screen, a portion of the discrimination limit color at which it becomes difficult to discriminate colors on the color chart CC is touched. In the same manner, the wavelength λp at the discrimination limit level L when the Purkinje phenomenon occurs is detected, and this is taken as the Pp wavelength information.

[0037] The Pn wavelength information and Pp wavelength information, i.e., the wavelengths of the discrimination threshold colors, are stored in the storage unit 612. The W control unit 611 then compares the Pn wavelength information and Pp wavelength information stored in the storage unit 612 with the relative luminous efficiency R1, R2 shown in FIG. 8(a). Since the relative luminous efficiency generally has a characteristic close to a normal distribution, for example, if the wavelengths λn, λp at which the sensitivity on the long wavelength side drops to the discrimination threshold level L in the characteristics of the relative luminous efficiency correspond to the wavelengths of the discrimination threshold colors, the wavelength characteristic of the relative luminous efficiency can be detected. Therefore, the relative luminous efficiency R1 when the Purkinje phenomenon does not occur can be detected from the Pn wavelength information, and the relative luminous efficiency R2 when the Purkinje phenomenon occurs can be detected from the Pp wavelength information.

[0038] In addition, in the embodiment, when the brightness of the outside becomes lower than a predetermined value based on the output of an illuminance sensor that detects the brightness outside the vehicle among the various sensors 66, that is, when the Purkinje phenomenon occurs, the W control unit 611 of the light emission control device 6 controls the light emission of the main LED 41. That is, when the main LED 41 emits light, the light emission intensity of each of the red and green LED chips is relatively higher than the light emission intensity (also called spectral power) of the blue LED chip. In this case, the light emission intensity of the blue LED chip may be lowered. As a result, as shown in FIG. 9(c), the color temperature of the white light emitted by the main LED 41 is controlled to have a spectral characteristic W2 in which the luminance of the green to red region, especially the yellow region, is increased. It goes without saying that this color temperature is within the range specified by regulations.

[0039] In this way, when the color temperature of the white light of the high beam lamp unit 1 by the main LED 41 is adjusted, even if the relative luminous efficiency is shifted to the short wavelength side by the Purkinje phenomenon to the relative luminous efficiency R2, the spectral components on the long wavelength side within the wavelength range of this relative luminous efficiency R2 are enhanced. That is, the area A3 shown by dotted lines in Fig. 9(c) becomes visible, and the visibility on the long wavelength side of the combined area A2 and area A3 is enhanced. Therefore, the visibility of the area from yellow to red is enhanced, and the visibility of red road signs is improved.

[0040] Incidentally, the technology of Patent Document 1 reduces the light on the short wavelength side during the Purkinje phenomenon, so it is effective in suppressing glare caused by light on the short wavelength side, but since the luminous intensity of the light on the long wavelength side is not particularly increased, it is difficult to improve the visibility on the long wavelength side. In contrast, the embodiment increases the luminous intensity of the light on the long wavelength side, so even if the relative luminous efficiency shifts to the short wavelength side due to the Purkinje phenomenon, the decrease in visibility on the long wavelength side is suppressed, and visibility is improved compared to the case where no countermeasure is taken.

[0041] However, as described above, since the Purkinje phenomenon varies from person to person, it is difficult to provide suitable control for all people by simply adjusting the color temperature of white light. In this embodiment, the above-mentioned simple relative luminosity detection is performed for each passenger, thereby eliminating individual differences when the Purkinje phenomenon occurs.

[0042] The W control unit 611 detects the relative luminosity R2 when the Purkinje phenomenon occurs for a large number of people greater than a predetermined number in advance, takes an average of the detected relative luminosity, and sets the averaged average relative luminosity as the standard relative luminosity information R2o shown by the solid line as shown in FIG. 10. The control of the color temperature of the main LED 41 for the Purkinje phenomenon described above is performed using this standard relative luminosity information R2o. Then, the relative luminosity is detected for each passenger, and the detected individual relative luminosity is set as the individual relative luminosity information. FIG. 10 shows two individual relative luminosity information R2a (one-dot chain line) and individual relative luminosity R2b (two-dot chain line). Then, the individual relative luminosity information R2a and R2b are compared with the standard relative luminosity information R2o to calculate the difference between the two relative luminosities, that is, the deviations Δλa and Δλb of the wavelengths of light. These deviations Δλa and Δλb are stored in the memory unit 612.

[0043] When the W control unit 611 controls the main LED 41 when the Purkinje phenomenon occurs, the W control unit 611 adjusts the increase amount of the spectral power in the wavelength region on the long wavelength side according to the deviations Δλa and Δλb stored in the storage unit 612. For example, when the individual relative luminosity information R2b is shifted to the long wavelength side from the standard relative luminosity information R2o, the decrease in visibility on the long wavelength side is small, so the amount of spectral power in the wavelength region on the long wavelength side is increased by a spectral power smaller than the standard. Conversely, when the individual relative luminosity information R2a is shifted to the short wavelength side from the standard relative luminosity information R2o, the decrease in visibility on the long wavelength side is significant, so the amount of spectral power in the wavelength region on the long wavelength side is increased by a spectral power larger than the standard. In this case, the magnitude value of the spectral pattern may be controlled in a required relationship according to the absolute value of the deviation, for example, proportionally.

[0044] As a result, even if there are different deviations in the relative luminosity of multiple occupants, the color temperature of the main LED 41 can be controlled in response to each deviation, thereby enabling light emission control that eliminates the deviation for each occupant. Therefore, it is possible to improve the visibility in the long wavelength region associated with the Purkinje phenomenon equally for all occupants.

[0045] In the case where a plurality of different occupants drive the same vehicle, a camera 68 may be connected to the light emission control device 6 as shown in Fig. 6. This camera 68 is configured as an occupant recognition device, and is disposed in a position in front of the driver's seat of the vehicle, and is configured as a device for identifying the occupant by analyzing the iris of the occupant captured by the camera. Then, when the W control unit 611 detects individual relative luminosity information for each different occupant, the detected individual relative luminosity information is linked to the occupant recognized by the occupant recognition device 68 and stored in the storage unit 612.

[0046] When an occupant sits in the driver's seat, the occupant recognition device 68 identifies the occupant from the occupant's iris captured by the camera. Then, the occupant and the individual relative luminosity information linked to the occupant stored in the memory unit 612 are searched for, and the W control unit 611 controls the light emission of the main LED 41 based on the searched individual relative luminosity information. As a result, when the occupant drives during twilight or nighttime when the Purkinje phenomenon occurs, the light emission of the high beam lamp unit 1 is controlled based on the stored individual relative luminosity information of the occupant, improving visibility on the long wavelength side.

[0047] In the present invention, the P detection device 67 for detecting the relative luminosity of an occupant may be configured as a portable terminal wirelessly connected to the interface unit 60, and may be configured so that the occupant operates the portable terminal to obtain P detection information and detect the relative luminosity under normal conditions and during the Purkinje phenomenon.

[0048] In the present invention, even when the high beam lamp unit 1 of the embodiment is functioning as a display device DP, the light emission of the sub-LED 42 can be controlled and a road sign can be illuminated by the light emitted from the display device DP. Even in this case, the visibility on the long wavelength side can be improved by making the sub-LED 42 emit white light and controlling the color temperature of the white light.

[0049] The present invention is not limited to a light source being an LED, as long as the lamp is capable of controlling the color temperature of the emitted light. Furthermore, the lamp to which the present invention is applied is not limited to a high beam lamp, but may be a low beam lamp or a fog lamp. [Explanation of symbols]

[0050] 1 High beam lamp unit 2 Clearance lamp unit 3 Low beam lamp unit 4 Light source board 5 Irradiation optical system 6 Light Emitting Control Device 41 Main light source (main LED) 42 Sub-light source (sub-LED) 50 Inner lens (irradiation optical system) 51 Primary Lens 52 Secondary Lens 61 High beam control unit 62 Clearance control section 63 Low beam control unit 64 Display control section 65 Switch 66 Various Sensors 67 Purkinje detector 68 Occupant Identification Unit 611 White light control unit 612 Storage section 100 Lamp housing 101 Lamp body 102 Outer Lens

Claims

1. A vehicle lamp having a light source capable of correcting the color temperature of emitted light, characterized in that the vehicle lamp further comprises an emission control means for controlling the light source to increase the spectral power on the long wavelength side within the sensitivity range of the relative luminous efficiency of an occupant when the Purkinje phenomenon occurs.

2. 2. The vehicular lamp according to claim 1, further comprising a detection means for detecting a wavelength of a color that can be discerned by an occupant when the Purkinje phenomenon occurs, detecting a relative luminosity of the occupant based on the wavelength, and outputting the detected relative luminosity information.

3. 3. The vehicular lamp according to claim 2, wherein the light emission control means includes a storage means for storing the detected relative luminosity information, and when the Purkinje phenomenon occurs, the light emission control means controls the light emission based on the relative luminosity information stored in the storage means.

4. 4. The vehicle lamp according to claim 3, further comprising an occupant recognition means for recognizing an occupant, wherein the memory means stores a plurality of recognized occupants in association with individual relative visibility information of each occupant, and when an occupant is recognized by the occupant recognition means, the light emission control means controls the light emission based on the individual relative visibility information associated with the recognized occupant.

5. 5. The vehicular lamp according to claim 4, wherein the light emission control means determines a deviation, which is a shift in the wavelength direction between standard relative luminosity information standardized based on a predetermined number or more of relative luminosity information and the individual relative luminosity information of each detected occupant, and performs control to change the amount of spectral power to be increased according to the value of the deviation.

6. 6. The vehicular lamp according to claim 5, wherein when the individual relative luminosity information is shifted to the long wavelength side relative to the standard relative luminosity information, the increase value of the spectral power on the long wavelength side is reduced, and when the individual relative luminosity information is shifted to the short wavelength side, the increase value of the spectral power on the long wavelength side is increased.

7. 7. The vehicular lamp according to claim 6, wherein the increase in the spectral power is proportional to an absolute value of the deviation.

8. 8. The vehicle lamp according to claim 1, wherein the light source includes a plurality of light-emitting elements that emit light of different colors, and the light emission control means controls the emission luminosity of the plurality of light-emitting elements to emit white light of different color temperatures.

9. 9. The vehicle lamp according to claim 8, which is applied to a headlamp of an automobile.

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