JP2017117605A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture which has excellent visibility and an attention-calling property, which can be manufactured at low cost and which has a high grade feeling.SOLUTION: A lighting fixture includes a light source and a light guide body for propagating the light from the light source inside and for emitting it to the outside. The plurality of light sources are mounted on the light guide body, and a light source driving device for driving the plurality of light sources is provided. The light source driving device is constituted so as to drive the plurality of light sources individually so that a region in which intensity distribution of the light emitting to the outside from the light guide body becomes maximum changes in an emission region of the light guide body. The light guide body has a first surface for emitting light and a second surface opposing to the first surface. On the first surface and the second surface, it is preferable that a texture be formed for generating a moire pattern in the light emitting from the first surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lamp provided with a light source device that can be used as a linear or planar light source.

  For example, as a light source device that can be suitably used as a lighting fixture to be attached to a wall surface, or as a vehicular lamp in a moving body such as an automobile, light from a solid light source is incident on a light guide made of a transparent member, and the light is A configuration in which light is extracted from the light guide by scattering by the uneven shape formed on the surface of the light guide is already known. For example, in Patent Documents 1 and 2 below, the uneven shape formed on the light guide is made into a fine pattern so that the bright and dark patterns caused by the individual patterns are not visible, and the appearance and appearance of the light source device are visible. Techniques for improving the above are disclosed.

JP 2014-29819 A JP 2013-143307 A

  However, although the appearance of the light source device on the limited evaluation criteria is improved by adopting a configuration in which the bright and dark patterns caused by the individual fine patterns are not visible, the light emission distribution is uniform and planar, and static It will become something. Therefore, especially when considering use as a brake light or information indicator for vehicles, its visibility and ability to prompt attention (hereinafter referred to as “attention”) are poor, and sufficient performance is not necessarily required. Could not be said to be able to demonstrate.

  In particular, in recent years, in order to differentiate it from conventional products, rather than having a uniform and flat emission distribution, it has a high-class feeling that has excellent emission characteristics such as visibility and alertness. Lighting fixtures and lamps have been required.

  Therefore, the present invention has been achieved in view of the above-described problems in the prior art, and an object of the present invention is to provide a lamp that has high visibility and alertness and can be manufactured at low cost.

  As an embodiment for achieving the above object, according to the present invention, there is provided a lamp comprising a light source and a light guide that propagates light from the light source and emits the light to the outside. A plurality of the light sources are attached to the light guide, and further include a light source driving device for driving the plurality of light sources, and the light source driving device is externally provided from the light guide. There is provided a lamp configured to individually drive the plurality of light sources such that a region where the intensity distribution of emitted light is maximized changes in the emission region of the light guide. The light guide has a first surface that emits light and a second surface facing the first surface, and the first surface and the second surface include the first surface and the second surface. It is preferable to form a texture for generating a moire pattern in the light emitted from the first surface.

  According to the present invention, a lamp that has high visibility and alertness, can be manufactured at low cost, and has a high-class feeling, and further, a direction in which the traveling direction of the vehicle is displayed using the lamp. An excellent effect is obtained that it is possible to provide a vehicular lamp such as an indicator.

It is a figure which shows the fundamental structure of the lamp which concerns on one Example of this invention. It is a wave form diagram for demonstrating the light control by PWM of the lamp which concerns on one Example of this invention. It is a figure which shows about the relationship between the cycle number of ON period of PWM dimming in the said lamp / 100, and the brightness [%] of a light source. It is a block diagram which shows an example of the said lamp and its peripheral circuit. It is a figure which shows the waveform of each part for demonstrating the light emission operation | movement of the said lamp. It is a figure which shows the waveform of two solid light sources for demonstrating the light emission operation | movement of the said lamp. It is a perspective view which shows the more detailed structure of the light guide which is a main member of the said lamp. It is a perspective view which shows the detail of the whole structure of the said lamp. It is a figure which shows the detailed shape of the 1st texture of the light guide in the said lamp. It is a figure which shows the detailed shape of the 2nd texture of the light guide in the said lamp. It is sectional drawing which shows the shape of the 3rd texture of the light guide in the said lamp. It is a figure which shows an example of the character formed in the said texture. It is a figure which shows the external appearance shape of the lamp which concerns on one Example of this invention. It is a figure which shows the example which utilized the lamp | ramp used as the said Example especially as a lamp | ramp for vehicles (vehicle direction indicator). It is a figure which shows an example of the display operation at the time of utilizing the said lamp as a lamp for vehicles. It is a figure which shows an example of the whole structure containing the lamp of this invention at the time of utilizing as said lamp for vehicles. FIG. 16 is a block diagram showing further details of FIG. 15. It is a block diagram for demonstrating operation | movement centering on the lamp | ramp of this invention in said whole structure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Principle of the invention>
FIG. 1 shows a basic configuration of a lamp 10 according to an embodiment of the present invention. As is clear from the figure, a light guide body 11 formed into a rectangular plate shape as a whole is provided by a translucent resin member such as acrylic resin or polycarbonate, for example, in the vicinity of both ends in the longitudinal direction ( In this example, individual light sources 300-1 and 300-2 such as LEDs are attached as light emission sources to the opposite end surfaces, respectively. The two individual light sources 300-1 and 300-2, which are the light emission sources, supply driving light from a drive circuit 19 configured by, for example, transistors or FETs for supplying light emission power for light emission. Are configured to be supplied individually.

  According to the lamp having the above-described configuration, that is, as indicated by a solid line arrow in the drawing, in the lamp of the present invention, an individual light source 300-1 such as an LED that is a light source provided at both ends of the light guide 11 is used. , 300-2 are respectively guided to the inside of the light guide 11, propagated through the inside, and then emitted to the outside from the emission surface (the upper surface in the figure in this example).

  At this time, in order to drive the individual light sources 300-1 and 300-2, the drive current supplied from the drive circuit 19 is changed continuously and repeatedly. That is, if the drive current is controlled so that the region where the intensity distribution of the light from the light guide 11 is maximum changes in the emission region (emission surface) of the light guide, it is as if inside the light guide 11. An effect is obtained as if the embedded light emitters are sequentially moving in a predetermined direction.

  Next, the drive current supplied from the drive circuit 19 for driving the two individual light sources 300-1 and 300-2 will be described with reference to FIGS.

<Dimming control by PWM>
In this example, the two individual light sources 300-1 and 300-2 are driven by performing dimming control by so-called PWM (Pulse Width Modulation). For example, as shown in FIG. 2, by using a clock signal having a clock operating frequency = 10 kHz (0.1 msec) and performing ON / OFF control on the basis of 100 clock cycles, the brightness is set to 0 to 100%. Control with (resolution = 1%). Here, the light guide 11 as a whole is turned on every 0.1 msec × 100 cycles = 10 msec. However, since it cannot be detected by human vision, flickering and the like are not set. ing.

  Next, FIG. 3 shows a relationship between the number of cycles of the above-described PWM dimming period / 100 (duty ratio) and the brightness [%] of the light source. Note that the relationship between the number of cycles in the ON period / 100 and the brightness [%] of the light source is generally set so as to change linearly as indicated by a broken line in the figure. On the other hand, in this example, as shown by a solid line in FIG. 3, the logarithmic change curve is set. This is set in consideration of human visibility. Compared with the case where the change in the light amount is linearly changed with respect to the duty ratio (broken line in FIG. 3), rather, the logarithm. Changing along the curve (solid line in FIG. 3) is more preferable because the change in the amount of light looks more natural (or linear) to the human eye. Further, the PWM dimming described above will be described in more detail below.

  FIG. 4 shows, in addition to the two individual light sources 300-1 and 300-2 and the drive circuit 19, a control circuit composed of, for example, a microcomputer or an FPGA for controlling the lighting of the lamp. 25 is a circuit diagram showing the overall configuration including the external power supply 20. That is, the drive circuit 19 is supplied with the necessary power from the external power supply 20 and drives the individual light sources 300-1 and 300-2 based on the control signal (light quantity information) from the control circuit 25. Generate current. The control circuit 25 will be described in detail later.

  FIG. 5 shows an example of the operation of the drive circuit 19 in the case where the amount of light, which is the brightness of the light source, is continuously changed. Here, the light source 1 (corresponding to reference numeral 300-1 in FIG. 1) is shown. The lighting of the light source 2 (corresponding to the reference numeral 300-2 in FIG. 1) is controlled alternately. FIG. 5A shows a case where the brightness of the light source 1 is changed (reduced) from 85% to 80%. In FIG. 5B, the brightness of the light source 2 is changed from 10% to 15% ( (Increase) is shown respectively. Here, as described above, a case where the duty ratio with respect to the change in the light amount is changed along the logarithmic curve will be described.

  In FIG. 5 (A), the clock is shown at the top with the number of clock cycles (frequency: 10 kHz), and the light source 1 (and light source 2) is turned on / off based on 100 clocks. OFF is controlled. That is, as shown on the left side of the figure, since the brightness of the light source 1 before the change is 85%, the number of cycles in the ON period / 100 = 50 cycles, which is indicated by “light source 1 output signal” in the figure. As described above, the period of 50 cycles in 100 cycles is ON (50 cycle ON) (see the logarithmic change curve of the solid line in FIG. 3). At this time, as shown in the lower part of the figure, in the previous cycle (in this example, the previous cycle), the “light source 1 read signal” is in the ON state. A control signal (light quantity information) is read from the control circuit 25 configured by the microcomputer, FPGA, etc. (in this example, “85%”), and thereafter, the light quantity is controlled based on the read control signal (light quantity information). It has a configuration.

  Then, in the next 100 cycles, as shown in the center part of the figure, the brightness of the light source 1 after the change is 80%, so the period of 40 cycles in the 100 cycles is ON (40 cycle ON). (See the logarithmic change curve of the solid line in FIG. 3). At this time, similarly to the above, the control signal (light quantity information) = 80% from the control circuit 25 is read out at the 100th cycle of the immediately preceding cycle.

  FIG. 5B shows a state of dimming control of the light source 2, and in the same manner as described above, the brightness is set to 10% (ON “2 cycle in the period of two cycles out of 100 cycles). ON ”) is shown to change (rise) from 15% (ON“ 3 cycle ON ”in the period of 3 cycles out of 100 cycles).

  As is clear from the above description, according to the lamp composed of the light guide 11 having the above-described light control function, the light amount from the individual light sources 300-1 and 300-2 that are the light sources, Independently of each other, it is possible to control freely, and an effect is obtained as if the light emitters embedded therein are sequentially moving in a predetermined direction.

  Next, a more specific example of controlling the light emission amount from the individual light sources 300-1 and 300-2 that are the light sources will be described below.

  FIG. 6 shows a change in the amount of light of the light source 1 (corresponding to reference numeral 300-1 in FIG. 1) and the light source 2 (corresponding to reference numeral 300-2 in FIG. 1). In this example, the light amounts of the two light sources 1 and 2 are changed independently at a cycle of 1 second. According to this, as described above, the light guide 11 as a whole is turned on every 10 msec, so that the amount of light can be controlled in units of 1/10 msec = 100 [%]. In addition, the vertical axis | shaft of a figure has shown the brightness [%] of the light source, more specifically apparent brightness, and the horizontal axis has shown time.

  As is apparent from the figure, the light source 1 is first turned on, reaches the maximum brightness (100%) after 0.2 seconds, and then gradually decreases the light amount to zero (0.6) after 0.6 seconds. 0) Control to be%. On the other hand, with respect to the light source 2, light emission is started after 0.2 seconds, that is, when the light amount of the light source 1 becomes maximum, and the maximum brightness (100%) when 0.6 seconds are exceeded. Then, the amount of light is gradually reduced, and control is performed so that it becomes zero (0)% in the vicinity of 0.8 seconds.

  According to the control of the light amounts of the light source 1 and the light source 2 described above, the light guide 11 constituting the lamp 10 shown in FIG. It was confirmed that the effect of moving sequentially from left to right can be given. In this case, the rising angle when the light source 1 is turned on (“α1” in the figure) is set to be larger than the rising angle when the light source 2 is turned on (“α2” in the figure). It was found that the effect can be obtained reliably and is preferable.

  In the above-described configuration of the lamp 10 in principle, the light guide 11 has been described as being formed into a predetermined shape by a translucent resin member. It is preferable to form a pattern called texture, and the details will be described below.

<Texture structure>
FIG. 7 is a perspective view showing a more detailed structure of the light guide 11 which is a main member of the lamp 10 according to one embodiment of the present invention. In particular, FIG. 7A is a perspective view of the light guide 11 viewed from the front surface, and FIG. 7B is a perspective view of the light guide 11 viewed from the back surface. Show.

  As is clear from these figures, the light guide 11 has a light emitting portion 13 formed into a rectangular plate shape as a whole by a translucent resin member, as described above. At both ends in the longitudinal direction, substantially triangular light introducing portions 12a and 12b are formed, and light receiving portions (surfaces) 14a and 14b are formed at the tip portions. In addition, the light emitting unit 13 (corresponding to the light guide 11) that is a light emission surface includes an upper side surface 13a and a substantially parallel facing surface (lower side surface) 13b facing the upper side surface 13a. A texture 15 described in detail below is formed on the emission surface (upper side surface) 13a of the light emitting section 13 (see FIG. 7A), and the opposite surface (lower side surface) 13b (see FIG. 7B). )), And textures 16 and 17 described in detail below are formed. In FIG. 7B, characters 18a to 18d (in this example, “STOP”) displayed by the lamp are formed on the opposing surface (lower side surface) 13b of the light guide 11. .

  FIG. 8 shows a perspective view of the lamp 10 in a state where the light guide 11 described above is housed in a case and attached to a lid member. In particular, FIG. 8A shows the light guide 11. For example, the light source device 10 in a state of being housed in a case 21 formed of metal or resin, and FIG. 8B further illustrates the above lid member formed of, for example, metal or resin. Each of the lamps 10 with 22 attached is shown. Reference numerals 23a and 23b in the figure are not limited thereto, but indicate, for example, solid light sources including individual light emitting elements including a semiconductor laser, organic electroluminescence (organic EL), and the like. Reference numerals 24a and 24b denote substrates on which the solid-state light sources are respectively mounted.

  FIG. 9 shows the shape of the above-described (first) texture 15, and in particular, shows the overall shape of the texture 15 formed on the light emitting side of the light emitting unit 13.

The texture 15 formed on the emission surface (upper side surface) 13a side of the light emitting portion 13 is a shape bent at the center portion (in this example, the center portion is directed to the right side of the drawing) as is apparent from these drawings. Each texture 15 has, for example, a relative angle θ ₀ of about 5 with respect to a texture 16 (texture 16 formed on the facing surface (lower side surface) 13b side) described later. It is set to be degrees.

  FIG. 10 shows the shapes of the textures 16 and 17 formed on the light emitting portion back surface 13b. The texture 16 has a shape protruding along the direction perpendicular to the longitudinal direction of the light emitting portion 13b, and the texture 17 has a shape protruding along the longitudinal direction.

Here, the pitch P <b> 2 of the texture 16 is determined according to the following expression from the relationship with the period P <b> 0 of the moire desired to be generated by the interference with the pitch P <b> 1 of the texture 15.
| P1-P2 | = P1 ² / P0 (Formula 1)

  As described above, the (second) texture 16 having a slight pitch difference is provided on the opposing surface (lower side) 13b side with respect to the (first) texture 15 on the emission surface (upper side surface) 13a side. According to the above, it is possible to obtain a configuration that generates moire fringes (patterns), and in particular, it is possible to obtain synergistically with the effect obtained by the above-described dimming control by PWM. That is, by continuously changing only the light amounts of the two individual light sources, it is as if a large number of light emitters embedded in the back surface of the light guide 11 constituting the lamp 10 continuously in a predetermined direction. On the other hand, the same effect can be obtained if the lamps are sequentially turned on, so that it is possible to manufacture a high-quality, high-value-added lamp having a high-class feeling at a relatively low cost. .

  In the above example, the texture 15 is configured by a groove having a concave cross section, and the pitch P1 is set to about 1 mm. Note that the value of this pitch can be set as appropriate. However, when the pitch P1 is set to a value smaller than 1 mm, the processing accuracy becomes severe and the processing time becomes long, which is not preferable. If the value is too large, the visibility of each groove is improved (improves), and the texture 15 interferes with the visibility of moire fringes caused by interference with the texture 16 described later. After all, it is not preferable. Therefore, it is preferable to select a pitch at which the apparent angle at which the visibility is reduced is 1 minute (1/60 degrees) or less in the distance between the target person and the light source device assumed according to the purpose of use. .

  In addition to the texture 16 described above, it is also preferable to provide a (third) texture 17a or 17b having a function of reflecting outside light as shown in FIG. According to this, even when the solid light source is turned off, an effect that the visibility is ensured to some extent is obtained.

  Furthermore, the cross-sectional shape of the textures 16 and 17 described above may be, for example, a roof shape or a cylindrical shape instead of the convex shape. Furthermore, as shown in FIG. 12, characters or patterns 18 may be formed on a part of the back surface 13 b of the light emitting portion of the light guide 11. In addition, according to this, it becomes possible to display the said character or pattern on the surface of the light guide 11 in a floating manner.

  Subsequently, a more specific application example of the lamp described in detail above will be described with reference to FIG.

  First, FIG. 13 (A) shows an example of a form in the case where the lamp 10 according to the present invention is used by being attached to an indoor ceiling surface or wall surface or outdoors. Here, in particular, as an example of an indoor guidance lamp such as a public facility, an example is shown in which characters “EXIT” are displayed at a substantially central portion of the display surface in order to guide the direction of the exit.

  In this way, a part of the surface of the light guide 11 (in the above example, the back surface) is formed into a shape obtained by removing it into a concave shape, so that characters or patterns are recognized on a part of the light emitting portion surface 13a. It is configured to be able to. That is, by selectively removing a part of the texture in this way, moire is not generated in that part, and the recognizability of the display of characters or patterns is compared with the moire generation part outside the area. Improvement can be expected. Therefore, this structure is a suitable structure as an indicator lamp for alerting.

  In consideration of indoor use as described above, since the distance between the subject and the light source device is generally assumed to be 2 m or more, the pitch P1 of the texture 15 is set to 0.6 mm or less. Thus, the angle of 1 minute or less, which is the above-described condition, can be satisfied. In addition, when considering a lighting fixture that is an indicator lamp outdoors, it is assumed that the distance between the subject and the light source device is approximately 5 m or more, and the pitch P1 of the texture 15 is set to 1.5 mm or less. By doing so, the angle of 1 minute or less, which is the above condition, can be satisfied.

  Furthermore, according to the above-described two individual light sources and dimming control using PWM, it is as if many light emitters embedded in the back surface of the light guide 11 constituting the lamp 10 are continuously directed in a predetermined direction. (In this example, in the right direction in the figure), the effect of being sequentially lit is obtained. That is, it is possible to display while improving the visibility and the ability to call attention together with the warning of the presence of the exit and the direction in which it is present (in this example, the right direction). However, the present invention is not limited to this.

  That is, FIG. 13B shows an example in which the lamp 10 according to the present invention is used as a lamp for a vehicle including an automobile, in particular, as a vehicular direction indicator for attaching to the front and rear of the vehicle to indicate the traveling direction. The details will be described below with reference to the drawings.

<Vehicle direction indicator>
14A and 14B, a passenger car is shown as an example of the vehicle 30 on which the lamp 10 described above is mounted. As shown in these drawings, the main body of the host vehicle (passenger car) 30 is shown. A pair of left and right headlights (HL) 31 are provided in front of the vehicle body, and a pair of red left and right tail lamps 38 are provided behind the vehicle body, for example. In the present embodiment, the above-described lamp 10 is used as a vehicular direction indicator, in front of the vehicle, directly below the pair of headlights (HL) 31 and also behind it, below the pair of tail lamps 38, respectively. It is attached. In the figure, the front direction indicator lamp is indicated by reference numeral 10 and the rear direction indicator lamp is indicated by 10 '. Further, in the above, an example in which the lamp is mounted on the front and rear headlights and / or the lower part of the tail lamp of the vehicle 30 has been described. However, the present invention is not limited to these examples. It will be apparent to those skilled in the art that it can be used by being attached to the outer wall surface.

  As shown in FIG. 15, when the vehicle turns to the left, an observer from the front of the vehicle appears to turn the vehicle to the right, and therefore the moire pattern preferably appears to flow from left to right. In order to realize such an operation, as a vehicle forward direction indicator, the pitch of the texture formed on the first surface of the light guide is narrower than the pitch of the texture formed on the second surface. There is a need to. On the other hand, even when the vehicle turns to the left, it is preferable that the moiré pattern appears to flow from the right to the left because the vehicle appears to turn leftward for an observer from the rear of the vehicle. In order to realize such an operation, as a vehicle rear direction indicator, the pitch of the texture formed on the first surface of the light guide is wider than the pitch of the texture formed on the second surface. There is a need to.

  Next, FIG. 16 shows an example of the configuration of an electronic control unit (light distribution control ECU) mounted in the vehicle 30 described above. As is apparent from this figure, the light distribution control ECU 40 includes a CPU (central processing unit) 41, a RAM 42 and ROM 43 as storage means, and an input / output device (I / O unit) 44. And the information from the following various information acquisition parts and a communication part is input into the said light distribution control ECU40 via the said I / O unit 44, The direction indicator for vehicles which are the said lamps, ie, the front The drive of each part including direction indicator lamp 10 and back direction indicator lamp 10 'is controlled.

  Here, the information from the various information acquisition units includes, for example, a speed signal indicating the traveling speed of the host vehicle 30, a signal indicating the engine state (ON / OFF), gear information indicating the gear position, and surroundings. Hazard signal that informs the driver of the presence of a hazard, steering wheel steering angle signal that indicates the steering angle of the steering wheel, the presence or absence of a turn signal (or "winker"), and a turn signal signal that indicates whether the left or right is lit / flashing, Furthermore, lamp lighting information indicating lighting / flashing states of the various lamps is included.

  In addition, as information from the various information acquisition units, for example, information (illuminance signal, chromaticity signal, etc.) from an external light sensor that detects light (brightness) outside the vehicle is attached to the vehicle. Video information from the camera, signals from distance sensors that detect the distance between the vehicle traveling in the vicinity, such as in front of the host vehicle 30, and other objects, and also the situation outside the vehicle at night The signal from the infrared sensor is included.

  Furthermore, the information from the communication unit is, for example, information from a navigation device that performs GPS (Global Positioning System) signal, route guidance, etc., for determining the position of the host vehicle 30, The navigation information includes information on vehicle-to-vehicle communication performed between other vehicles and road-to-vehicle communication performed between roads and vehicles.

  FIG. 17 shows a more detailed configuration of the above-described light distribution control ECU 40 and its peripheral elements. That is, in the figure, a direction indicator sensor 51, a steering wheel angle sensor 52, a shift position sensor 53, a vehicle speed sensor 54, an accelerator operation sensor 55, a brake operation sensor 56, an illuminance sensor 57, a chromaticity sensor 58, an engine start sensor 59, a hazard A signal from the lamp sensor 60 is input to the light distribution control ECU 40. Further, a signal from the camera 61 is input to the light distribution control ECU 40 via the image processing unit 62, and signals from the GPS reception unit 63 and the map information output unit 64 are input to the light distribution control ECU 40 via the calculation unit 65. Have been entered. A control signal from the light distribution control ECU 40 and a signal from the projection signal output unit 110 (video signal to be projected onto a road surface or the like) are input to the projector 100 constituting the video projection device 500 via the control unit 120. Has been. Further, the light distribution control ECU 40 further turns on / off the headlight from the headlight sensor 66, signals indicating the brightness at the time of lighting, and the high light beam when the headlight is lit from the high / low sensor 67. / A signal indicating a low state is input. These sensors 51 to 60, 66, and 67 constitute a sensor unit. Further, the luminance of the headlight 31 is controlled from the light distribution control ECU 40 via a headlight control unit (HL control unit) 119.

  In addition, the light distribution control ECU 40, for example, based on signals from the direction indicator sensor 51, the steering wheel angle sensor 52, the accelerator operation sensor 55, the brake operation sensor 56, etc., via the direction instruction control unit 161, The operation of direction indicator lamps 10FL, 10FR, 10′RL, 10′RR, which will also be described, is controlled.

  FIG. 18 shows the configuration of the vehicle direction indicator lamp centered on the control unit which is the above-described light distribution control ECU 40. In this figure, the direction indicator lamp 10 mounted on the left front side of the vehicle is shown. Is the reference sign 10FL, the direction indicator lamp 10 attached to the right front is the reference numeral 10FR, and the direction indicator lamp 10 'attached to the left rear of the vehicle is the reference numeral 10'RL, and the direction indicator lamp 10 attached to the right rear is 'Is indicated by the reference numeral 10' RR, respectively.

  Note that the lamp 10 shown in FIG. 13 is configured to generate moire fringes (patterns) bent in a “>” shape toward the right due to the texture formed on the surface of the light guide (light emitting portion) 11. However, the lamp 10 indicates a direction indicator lamp 10FL, 10'RR that is mounted on the left front side of the vehicle or on the right rear side of the vehicle. The direction indicator lamps 10FR and 10′RL attached to the left rear are preferably configured to generate moire fringes (patterns) bent in a “<” shape toward the left instead of the above. Accordingly, it is necessary to reverse the waveform shown in FIG. 6, which will be apparent to those skilled in the art.

  Returning to FIG. 18 again, the control unit 40 which is a light distribution control ECU, for example, inputs from the various sensors described above, such as (1) steering wheel rotation, (2) blinker display, (3) brake, (4) accelerator, etc. Based on the signal, the direction indicator lamp 10 to be blinked is determined and a control command is generated. As a result, the direction indicator lamp 10 that needs to be lit is driven based on this control command. At that time, according to the direction indicator lamp 10 having the above-described configuration and dimming control, the function not only indicates the direction in which the host vehicle is to bend by blinking, but also the light emitter The effect as if moving sequentially in that direction is obtained. That is, for this reason, for example, a direction indicator lamp excellent in visibility and alertness for a driver of a pedestrian, an oncoming vehicle, or a succeeding vehicle can be obtained.

  When considering the use as a vehicular lamp such as the direction indicator lamp described above, the distance between the vehicles during normal travel needs to be at least about 10 m, so the pitch P1 of the texture 15 is 2.9 mm. By making it below (range of 0.1 mm to 2.9 mm), the angle of 1 minute or less which is the above condition can be satisfied. In addition, even if a pedestrian is assumed, since the distance between the subject and the car is assumed to be 5 m or more, the pitch P1 of the texture 15 is 1.5 mm or less (range of 0.1 mm to 1.5 mm). By satisfying the above condition, the above condition of an angle of 1 minute or less can be satisfied. Further, according to the experiments by the inventors, the texture formed on the first surface is the pitch of the texture formed on the first surface of the light guide, particularly as the vehicle direction indicator. The pitch of the texture formed on the first surface of the light guide is set to be smaller than the pitch of the texture formed on the first surface. It has been found that widening is preferable.

  In addition, in the above description, the light guide 11 constituting the lamp 10 has been described as being turned on every 10 msec as a whole, however, the present invention is not limited to this, and its application It is possible to appropriately set an appropriate value according to the above. In particular, when considering use as a vehicular lamp, it is conceivable that a drive recorder for confirming the situation outside the vehicle by a camera or the like will be widely used due to the development of automatic driving in the future. In such a case, depending on the relationship with the imaging timing of the camera, it may be difficult to project on the drive recorder. In that case, it is preferable to set the timing of the blinking so that the lighting of the lamp 10 is reliably reflected on the drive recorder.

  In the above, the lamp etc. which become various Example of this invention were described. However, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments are described in detail for the entire system in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment. For example, by changing the groove spacing or by adopting a non-parallel (non-parallel) configuration, the moire pitch can be changed within the same screen, or the moire movement speed can be changed with respect to visual field movement. Variations can be increased.

  DESCRIPTION OF SYMBOLS 10 ... Lamp, 11 ... Light guide, 300-1, 300-2 ... Solid light source, 15, 16, 17 ... Texture, 19 ... Drive circuit, 25 ... Control circuit, 21 ... Case, 40 ... Electronic control unit (arrangement) Light control ECU).

Claims (11)

A light source;
A light guide that propagates the light from the light source and emits the light to the outside,
A plurality of the light sources are attached to the light guide,
A light source driving device for driving the plurality of light sources;
The light source driving device individually drives the plurality of light sources so that a region in which an intensity distribution of light emitted from the light guide to the outside is maximum changes in an emission region of the light guide. It is composed of a lamp. The lamp according to claim 1,
The light guide has a first surface that emits light and a second surface facing the first surface;
A lamp having a texture for generating a moire pattern in light emitted from the first surface on the first surface and the second surface. The lamp according to claim 2,
The first texture formed on the first surface of the light guide and the second texture formed on the second surface have the moire pattern as the line-of-sight position moves with respect to the light guide. A lamp that is shaped to move. The lamp according to claim 2,
The second surface of the light guide includes a second texture and a third texture formed in a substantially perpendicular direction with respect to the second texture,
A part of the second texture or the third texture formed on the second surface is selectively removed, and the distribution of emitted light from the first surface according to the removed portion is A lamp that is different from the light distribution from other parts. The lamp according to claim 2,
A lamp, wherein a texture formed on the first surface of the light guide is 0.1 mm to 1.5 mm. The lamp according to claim 5,
The lamp | ramp which made the texture formed in the said 1st surface of the said light guide into 0.1 mm-0.6 mm, and attached the said lamp | ramp to the indoor ceiling surface or wall surface, or the outdoors. The lamp according to claim 5,
The vehicle has the pitch of the texture formed on the first surface of the light guide narrower than the pitch of the texture formed on the second surface, and uses the lamp as a forward direction indicator for the vehicle. A lamp attached to a part of the lamp. The lamp according to claim 5,
The vehicle has the pitch of the texture formed on the first surface of the light guide larger than the pitch of the texture formed on the second surface, and uses the lamp as a direction indicator for the rear of the vehicle. A lamp attached to a part of the lamp. The lamp according to claim 1,
The light source driving device is a lamp that individually drives the plurality of light sources by dimming control using PWM. The lamp according to claim 1,
The light source driving device drives two light sources individually, and drives the rising of the emission amount from one light source with a delay from the rising of the emission amount from the other light source. The lamp according to claim 1,
The light source driving device drives two light sources individually, and drives the rise of the light emission amount from one light source to be steeper than the rise of the light emission amount from the other light source.

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