JP4737066B2 - Lighting device and control method thereof - Google Patents

Description

  The present invention relates to an illuminating device using a semiconductor light emitting element as a light source and a control method therefor, and particularly to an application to a vehicle headlamp device.

  In recent years, it has become possible to increase the brightness of LEDs (light-emitting diodes), which are white semiconductor light-emitting elements, and it has begun to be proposed to be applied to vehicle headlamp devices that require high illuminance.

  However, although the LED has a long life and high efficiency, when the light quantity of the LED is increased, the amount of heat generation inevitably increases, and not only the LED element temperature but also the temperature of the components around the LED significantly increases.

  In particular, an LED is a current-driven semiconductor light-emitting element, and emits light at a voltage of 4 V or less at most. Therefore, even with an input of several watts, an ampere-order current is required, and heat generation from wiring and the like must be considered. There is also the problem of having to.

  Therefore, in order to maintain high luminance, some measures against the LED temperature rise are required. If this countermeasure is insufficient, not only the original life of the LED is reduced, but there is a risk of damaging components such as resin around the LED. On the other hand, when the heat resistance of peripheral parts such as resin parts is increased, the material cost of the lighting device increases.

  In order to avoid the above problem, it is necessary to further improve the efficiency of the LED, efficiently discharge the heat generated by the lighting of the LED, and not accumulate the heat inside the headlamp unit.

  A conventional vehicle headlamp unit will be described below with reference to FIG. FIG. 6 is a schematic cross-sectional view illustrating the configuration of a conventional vehicle headlamp unit.

  As shown in FIG. 6, the vehicle headlamp unit includes an LED 606 that is two semiconductor light emitting elements disposed on a lens 601 provided in a housing 602 and a heat sink 605 housed in the housing 602. 607, a reflector 604, a light shielding plate 603, and a radiation fin 609 are provided. In addition, a light shielding plate 603 called a shade limits irradiation light that is an obstacle to an oncoming vehicle, and the housing 602 prevents entry of water or the like from the outside. The light emitted from the LEDs 606 and 607 is reflected by the reflector 604, travels along, for example, the optical path 608, is refracted by the lens 601, and irradiates the front as substantially parallel light.

  Here, the heat sink 605 is formed of a material having good heat conduction, and is configured to release the heat generated by the LEDs 606 and 607 to the outside through the radiation fins 609 connected to the heat sink 605.

  As a specific configuration, the LED is arranged at the focal point of the optical system, and the casing, the reflector, the lens, and the like are integrated, and the rotation is controlled to change the emitted light having the light distribution pattern in the left-right direction. A vehicular headlamp apparatus having a configuration to do so is disclosed (see, for example, Patent Document 1).

  In addition, a vehicle headlamp device is disclosed in which a plurality of LEDs are provided, each of which has a heat dissipating fin and a lens, thereby dispersing current and generated heat (for example, Patent Document 2). reference). Patent Document 2 aims to suppress an increase in the temperature of an LED and suppress a decrease in luminous flux of a light source and a change in emitted color. Among them, if the light source is dispersed by a plurality of LEDs and irradiated to the outside as parallel light beams by the lens placed in front of each LED, the amount of heat generated by each LED is maintained while maintaining the overall high brightness. It can be reduced.

  However, with the above configuration, each LED can be controlled at a low temperature at the beginning of lighting, but the total amount of heat generated from all the LEDs accumulates in the headlamp unit as the lighting time elapses. Therefore, for example, unless ventilation is performed by a fan or the like, there is a problem that the temperature of the headlamp unit rises and the lifespan of the housing and the LED is reduced.

  Also, in the vehicle headlamp device, in order to protect the LED and the housing from damage due to high temperature, when the housing temperature rises above a certain level, a warning or other information is given to the driver to take some measures Can be considered. However, for that purpose, additional parts such as a temperature sensor are required, and there is a problem that the cost increases.

  Therefore, in order to solve the above problem, in a plurality of unitized LEDs, a predetermined operation characteristic is compared with a reference characteristic for one of the LEDs, and a drive current is controlled based on the comparison result. Is disclosed (for example, see Patent Document 3).

However, when a plurality of LEDs are used, the temperature rise varies depending on the installation location of each LED, and therefore individual measurement and control for each LED is required. On the other hand, when the temperature rises greatly different in individual LEDs, a significant difference in life for each LED occurs, which may cause deterioration in maintainability and local damage of the device itself.
JP 2006-179246 A JP 2004-31224 A JP 2005-324656 A

  However, in the conventional vehicle headlamp device, in order to obtain a high luminance, it is necessary to configure with a plurality of LEDs. Therefore, as shown in Patent Document 2, an individual reflector is used for each LED, or an LED is used. A large reflector is required in which the light irradiated from the whole becomes approximately parallel light. For this reason, there is a problem that the headlamp unit itself is increased in size, and the increase in size limits the design of the vehicle and impairs functionality.

  In addition, if a plurality of LEDs are simultaneously driven for a long time, the temperature of the headlamp unit rises, not only reducing the life of the LEDs, but also causing the deformation and deterioration of the resin constituting the headlamp unit. It was. In particular, in an environment with a high ambient temperature, there was a concern about safety such as ignition in the worst case.

  The present invention has been made in order to solve the above-mentioned problems, and in consideration of the trend and design of the recent vehicle structure, achieves small size and high brightness and suppresses the temperature rise of the headlamp unit. An object is to provide a highly reliable lighting device.

  In order to achieve the above-described object, an illumination device of the present invention includes at least a semiconductor light emitting element and a reflector that reflects light emitted from the semiconductor light emitting element, and the reflection curved surface of the reflector has a reflection curved surface. It consists of a plurality of reflector pieces that can be varied. Further, the semiconductor light emitting element is disposed in the vicinity of the focal point of the reflection curved surface, and the lens is disposed in front of the reflection curved surface.

  Accordingly, it is possible to realize an illuminating device in which the focal position can be changed and the direction, position, spread, etc. of the light irradiated forward can be arbitrarily changed. Conventionally, it has been difficult to illuminate obliquely forward. However, by changing the reflector piece, it is possible to change the condensing position and easily illuminate obliquely forward. In particular, when used as a headlight for automobiles or motorcycles that require strong illumination, illumination can be performed in the front, rear, left, right, etc., and its spread and intensity can be changed freely, increasing the safety. A device is obtained.

  The lighting device of the present invention includes at least a plurality of semiconductor light emitting elements, and a reflector that drives the plurality of semiconductor light emitting elements in a time-sharing manner and reflects light emitted from each semiconductor light emitting element. The reflection curved surface is composed of a plurality of reflector pieces that can change the reflection curved surface, and the reflector pieces are varied in synchronism with the light emitted from the semiconductor light emitting element driven in a time-sharing manner to be condensed near the focal point and reflected. It has the structure which irradiates light ahead through the lens arrange | positioned ahead of a curved surface.

  Thereby, the light emission time of each semiconductor light emitting element can be shortened. As a result, an increase in the temperature of each semiconductor light emitting element can be suppressed, and the life of the semiconductor light emitting element can be improved and deterioration of the resin component of the lighting device can be prevented.

  Further, the semiconductor light emitting element is disposed on the base, and the base is connected to a heat radiator provided outside the reflector. The thermally conductive base is provided with a plurality of semiconductor light emitting elements individually. As a result, heat generated by the semiconductor light emitting element is efficiently radiated to the outside.

  Further, the reflector piece is varied by expansion and contraction of a plurality of piezoelectric bodies provided on the reflector piece. Further, the reflector piece is varied by electrostatic force or electromagnetic force. Accordingly, it is possible to configure a reflector capable of forming an arbitrary reflection curved surface freely and at high speed corresponding to the semiconductor light emitting element.

  Further, the control method of the lighting device of the present invention is a control method of a lighting device comprising at least a semiconductor light emitting element and a reflector having a plurality of reflector pieces that reflect light emitted from the semiconductor light emitting element, The reflector piece is variably controlled so as to form a reflection curved surface of the reflector, and light path control is performed by reflecting light emitted from the semiconductor light emitting element in a predetermined direction. Further, the optical path control is performed by arranging the semiconductor light emitting element near the focal point of the reflection curved surface.

  By these, it is possible to arbitrarily control the change of the focal position and the direction, position, spread, etc. of the light irradiated forward.

  Further, a plurality of semiconductor light emitting elements are arranged, and the plurality of semiconductor light emitting elements are driven in a time division manner, and the reflector piece is varied in synchronization with the light emitted from the semiconductor light emitting elements driven in the time division manner. You may control.

  As a result, it is possible to perform a control that can shorten the light emission time of each semiconductor light emitting element and suppress the temperature rise of the semiconductor light emitting element. In addition, since driving with a larger current than that in continuous operation can be realized by time-division driving, a high-luminance lighting device can be realized.

  Further, when input values applied to a plurality of semiconductor light emitting elements driven in a time division manner are individually measured when the semiconductor light emitting elements are turned on and change from predetermined voltage values and current values, The input value may be individually varied and controlled so as to have a predetermined voltage value and current value.

  Thereby, while being able to stabilize the light quantity of a some semiconductor light-emitting element, the illuminating device which was long-lived and excellent in reliability is realizable.

  ADVANTAGE OF THE INVENTION According to this invention, a small and highly safe illuminating device is realizable with the lifetime improvement of the several semiconductor light-emitting element and the whole illuminating device. Furthermore, when used as a headlamp for a vehicle such as an automobile, the design of the automobile can be improved and the degree of design freedom can be greatly increased.

  The illuminating device of the present invention is configured by a reflector piece in which a semiconductor light emitting element is disposed in the vicinity of a focal point of a reflection curved surface and the reflection curved surface is movable.

  In particular, when a plurality of semiconductor light emitting elements are used, the plurality of reflector pieces are moved and controlled in synchronization with lighting and non-lighting time division driving of each semiconductor light emitting element. Thereby, the light irradiated from each semiconductor light emitting element is configured to irradiate the front from the lens placed in the front as approximately parallel light rays.

  Hereinafter, specific embodiments will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a lighting apparatus according to a first embodiment of the present invention. FIG. 1A is an overall configuration diagram in which a housing covering the whole is removed, and FIG. 1B is a configuration diagram showing a light source unit of the illumination device according to the first embodiment of the present invention.

  As shown in FIG. 1A, the lighting device of the present invention includes a reflector 104 that includes at least a semiconductor light emitting element (not shown) provided in a housing (not shown) and a plurality of reflector pieces 103. Each of the reflector pieces 103 includes a driving device 105, a radiator 106, and a lens 101. Further, as shown in FIG. 1B, the semiconductor light emitting element 107 is connected to a radiator 106 such as a radiating fin, and is configured to release heat to the outside.

  Then, for example, light emitted from a semiconductor light emitting element (hereinafter sometimes referred to as “LED”) 107 such as an LED (light emitting diode) is reflected by a reflector 104 including a plurality of reflector pieces 103, and the focal point 102. After being refracted by the lens 101, the light is approximately irradiated as parallel light.

  Here, one end of a driving device 105 (only one portion is shown) connected to each reflector piece 103 and made of, for example, a piezoelectric element is fixed to a housing (not shown). Note that the driving device 105 is configured by combining, for example, four piezoelectric elements, and by applying a voltage to both ends of each piezoelectric element, the reflector piece 103 can be tilted and moved. It has become. For example, when a voltage is applied to one of the piezoelectric elements, the piezoelectric element expands and contracts, and the reflector piece 103 tilts in that direction. That is, the drive device 105 is attached to all the reflector pieces 103, and by changing the reflector pieces 103, a reflection curved surface such as an ellipsoidal curved surface is formed in the entire reflector 104. The reflective curved surface is not limited to the ellipsoidal curved surface described above, and may be configured as a complex curved surface by combining a parabolic curved surface, an ellipsoidal curved surface, a parabolic curved surface, or the like.

  Further, the LED 107 is disposed so as to be positioned in the vicinity of one focal point of the reflection curved surface, and the focal point 102 is another focal point of the reflector 104. Therefore, the light emitted from the LED 107 is reflected inside the reflector piece 103 and collected near the focal point 102.

  At this time, by driving the reflector piece 103 with the driving device 105, the shape of the reflection curved surface can be arbitrarily changed, so that the position of the focal point 102 can be moved back and forth and right and left. As a result, the light passing through the focal point 102 can freely change the irradiation direction, the irradiation area, and the like after passing through the lens 101.

  Although not shown in FIG. 1, when the piezoelectric element is greatly expanded and contracted, depending on the inclination angle, a large stress is generated on the joint surface between the piezoelectric element and the housing wall or the reflector piece 103, and adhesion peeling, etc. Will occur. Therefore, for example, it is preferable that an electrically insulating rubber having a relatively high hardness is interposed between the piezoelectric element and the housing wall.

  According to the present embodiment, by changing the reflector piece 103, it is possible to realize an illuminating device that can change the condensing position and easily change the irradiation direction and irradiation area. Thereby, a very small and varied illumination is possible.

(Second Embodiment)
Below, the illuminating device concerning the 2nd Embodiment of this invention is demonstrated in detail using FIG. FIG. 2 is a cross-sectional structure and operation explanatory diagram of the illumination device according to the second embodiment of the present invention. In the drawing, a curve that penetrates the housing wall 203 and is drawn in the lower half is an auxiliary line for explanation.

  As shown in FIG. 2, the lighting device according to the second embodiment has a plurality of reflector pieces 204 arranged inside a housing wall 203 and is attached to, for example, a base 215 and emits white light. , 207, 208, and three reflection curved surfaces 209, 210, 211 having a focal point in the vicinity of, for example, an ellipsoidal curved surface are formed approximately to constitute a reflector. Here, light shielding plates 212 and 216 are provided on the housing wall 203 as necessary to reduce scattered light components of the semiconductor light emitting element and direct light to the oncoming vehicle. As in the first embodiment, the reflection curved surface is not limited to the ellipsoidal curved surface described above, and may be configured as a compound curved surface by combining a parabolic curved surface, an ellipsoidal curved surface, a parabolic curved surface, or the like. .

  The reflection curved surfaces 209, 210, and 211 are formed by driving the reflector piece 204 in synchronization with the lighting of the LEDs 206, 207, and 208 so that the positions of the LEDs 206, 207, and 208 are in the vicinity of the focus. Has a focal point 202. Further, a lens 201 is provided in front of the common focal point 202, and the light from each LED is irradiated in the forward direction as approximately parallel light. Here, each reflector piece 204 is formed in, for example, a triangular shape, and includes a piezoelectric element 205 in the vicinity of the corner, and is connected to the housing wall 203 via the piezoelectric element 205.

  In other words, the illumination device according to the second embodiment applies a voltage to the piezoelectric element 205 to change the reflector piece 204 to perform parallel movement or tilt movement, and the positions of the LEDs 206, 207, and 208 are in the vicinity of the focal point. Reflective curved surfaces 209, 210, and 211 are formed so that

  Thereby, also in the illuminating device which has a big light source comprised by several LED, the light of several LED can be irradiated to the same direction fundamentally with one pseudo reflector. As a result, even if a large light source composed of a plurality of LEDs is used, the light source can be reduced equivalently, and thus a small and high-luminance illumination device can be realized.

  Below, the control method of the illuminating device concerning the 2nd Embodiment of this invention is demonstrated. FIG. 3 is a timing chart for driving a plurality of LEDs of the lighting apparatus according to the second embodiment of the present invention.

  3A to 3C show waveforms of input values (for example, current values and voltage values) of the LEDs 206, 207, and 208, and indicate periods in which the rising portions 301, 302, and 303 are lit. 3D to 3F show timings at which the plurality of reflector pieces 204 are driven in response to the light emission of the LEDs 206, 207, and 208. FIG. That is, the reflector composed of the plurality of reflector pieces 204 has three operation pattern waveforms determined in advance so as to form an approximate reflection curved surface in which the position of each LED is close to the focal point when each LED is turned on. Yes. Then, according to the operation pattern waveform, each piezoelectric element 205 is driven by a predetermined applied voltage to form a reflection curved surface.

  First, as shown in FIG. 3A, when the LED 206 is lit during the period of the rising portion 301, the operation pattern waveform shown in FIG. 3D is applied to each piezoelectric element of the plurality of reflector pieces 204 constituting the reflector. At 304, power (predetermined voltage and current) is supplied. With this electric power, each piezoelectric element 205 performs an expansion / contraction operation, the positions and inclinations of all the reflector pieces 204 are controlled, and a reflection curved surface is formed in which the positions of the LEDs 206 are close to the focal point.

  Next, when the LED 207 is turned on, the electric power of the operation pattern waveform 305 shown in FIG. 3E is supplied to the plurality of reflector pieces 204 to each piezoelectric element 205, and the position of the LED 207 is set to the vicinity of the focus by the expansion / contraction operation. A reflection curved surface is formed.

  Next, when the LED 208 is turned on, the electric power of the operation pattern waveform 306 shown in FIG. 3F is supplied to the plurality of reflector pieces 204 to each piezoelectric element 205, and the position of the LED 208 is set to the vicinity of the focus by the expansion / contraction operation. A reflection curved surface is formed.

  Then, by repeating the operation of each reflector piece 204, a plurality of LEDs are sequentially turned on and operate so as to be lit in a pseudo continuous manner.

  In the above description, the case of three LEDs has been described as an example, but the present invention is not limited to this. Moreover, although demonstrated by the example which provided LED on the straight line, it is not restricted to this. For example, the reflector pieces may be driven in synchronism with lighting so that they are two-dimensionally arranged on a plane and the vicinity of the position becomes a focal point.

  Below, the operation | movement of the reflector piece driven corresponding to lighting of LED is demonstrated using FIG. In FIG. 2, the operation of each reflector is shown at an arbitrary scale so that it can be easily understood. However, in reality, a reflector that forms a reflection curved surface in a pseudo manner is much larger than each LED. The amount of movement and inclination of the reflector piece is small.

  First, FIG. 2 shows a state in which the LED 208 is lit, and in the plurality of reflector pieces 204 and 204a, the position of the LED 208 is near the focal point of the reflection curved surface 211. As a result, the light emitted from the LED 208 is reflected by the reflector pieces 204 and 204 a, passes through the common focal point 202 along the optical path 214, and then is emitted to the outside as approximately parallel light by the lens 201. Will be.

  Next, when the LED 206 is turned on, the reflectors 204 and 204a are moved from the position of the reflector pieces 204 and 204a by the power (voltage and current) applied to the piezoelectric element 205 in synchronization with the operation pattern waveform 304 shown in FIG. It moves to the position of the piece 204b. In the drawing, in order to avoid complication, only one of the reflector pieces 204b is shown in a moving state, but in reality, each reflector piece moves along a one-dot chain line.

  At this time, the LED 208 is turned off and the LED 206 is turned on. As a result, the light emitted from the LED 206 is reflected by the reflector piece 204b, passes through the common focal point 202 along the optical path 213, and is then irradiated to the outside as approximately parallel light by the lens 201.

  As described above, even when a plurality of LEDs are installed, by changing the position of the reflector piece corresponding to the LED to be lit, the irradiation light is passed through the vicinity of the same common focus 202, Stable external illumination can be performed.

  In the present embodiment, the case where each LED operates in a stable state has been described as an example, but the present invention is not limited to this. For example, when the outside air temperature is high, it is possible that any one of the white LEDs reaches a temperature higher than the limit. In that case, a sensor circuit that detects an input value (current value or voltage value) when each white LED is turned on may be provided. As a result, if the preset current value or voltage value is different from the detected current value or voltage value, for example, it is large, as shown in FIG. The power and the like are controlled so as to be lowered from the rising portion 303. Thereby, for example, the heat generation of the LED operating at a high temperature can be reduced, the deterioration of the characteristics of the LED can be prevented, and a stable long-life lighting device can be obtained.

  Below, the light source unit which comprises the illuminating device concerning the 2nd Embodiment of this invention is demonstrated using FIG.

  FIG. 4A is a perspective view showing a light source unit constituting an illumination apparatus according to the second embodiment of the present invention, and FIG. 4B is a perspective view showing another example of the light source unit. FIG. 4 specifically shows the structure of the light source unit to which the three LEDs 206, 207, 208 shown in FIG. 2 are attached.

  FIG. 4A shows a light source unit 401 in the case of driving an LED with high output. That is, the light source unit 401 is provided with heat radiators 403, 404, and 405 including heat radiation fins corresponding to the respective LEDs 206, 207, and 208 at the tip of the base 215 to improve the heat radiation efficiency. Specifically, in consideration of heat transfer, the cross-sectional area of the base 215 made of, for example, copper is increased. This increases the distance between the LEDs, so that the amount of movement of the reflector piece 204 for forming the reflection curved surface increases with the lighting of the LEDs.

  FIG. 4B shows the light source unit 402 when a relatively low-power LED is driven. That is, since the light source unit 402 has a small output from the white LEDs 206, 207, and 208 and generates a small amount of heat, the cross-sectional areas of the radiators 406, 407, and 408 including the base 215 and the radiation fins can be reduced. Accordingly, the distance between the LEDs can be shortened, and the amount of movement of the reflector piece 204 can be reduced. Therefore, there is an advantage that the input value to the piezoelectric element 205 can be reduced. Furthermore, the lighting device itself can be reduced in size.

  According to the present embodiment, the same effects as those of the first embodiment can be obtained, and by driving a plurality of LEDs in a time-sharing manner, the driving time and the heat generation amount of each LED can be reduced and reliable. It is possible to realize a lighting device with excellent performance. Moreover, since it is not necessary to provide reflectors individually for a plurality of LEDs, a small and high-luminance lighting device can be realized.

  In addition, a light source unit that individually discharges heat generated from each LED and an input value of each LED are detected and controlled, thereby suppressing an increase in the temperature of each LED and suppressing an increase in the temperature of components. As a result, a longer-life lighting device can be obtained. As a result, the resin material used in the lighting device can be selected from many types of resin materials that are not suitable for high temperature use, so that the cost can be reduced.

(Third embodiment)
FIG. 5 is a schematic configuration diagram of an illumination apparatus according to the third embodiment of the present invention. FIG. 5A is an overall configuration diagram in which the casing covering the entire surface is removed, FIG. 5B is a configuration diagram of a light source unit on which the semiconductor light emitting element shown in FIG. 5A is mounted, and FIG. It is a block diagram which shows the drive device which drives a reflector piece.

  As shown in FIG. 5 (a), the lighting device of the present invention is a bullet-shaped type comprising at least a semiconductor light emitting element (not shown) provided in a housing (not shown) and a plurality of reflector pieces 503. Reflector 504, a driving device (not shown) provided on each reflector piece 503, a radiator 506, and a lens 501. Also, as shown in FIG. 5B, for example, six LEDs 507 are installed, two in the upper and lower pairs, and three pairs are arranged in a reflective curved surface such as an ellipsoidal curved surface, for example, in the axial direction. For example, it is connected to a heat radiator 506 such as a heat radiating fin, and is configured to release heat to the outside. The paired LEDs 507 are controlled so that both are lit simultaneously, and the irradiated light is reflected by each reflector piece 503, passes through a common focal point 502 by the optical path 512, and is irradiated from the lens 501 to the outside. The

  Here, the bullet-type reflector 504 has a structure in which an ellipsoid is cut in the middle. Further, the reflector 504 has a reflection curved surface approximately formed by a plurality of reflector pieces 503.

  The reflective curved surface is not limited to the ellipsoidal curved surface described above, and may be configured as a complex curved surface by combining a parabolic curved surface, an ellipsoidal curved surface, a parabolic curved surface, or the like. In the above description, three pairs are arranged in the axial direction of the ellipsoid, but the present invention is not limited to this. For example, as long as the focal point can be formed with a reflection curved surface in the vicinity of the position of each LED, it may be arranged at an arbitrary position.

  Similarly to the second embodiment, the plurality of reflector pieces 503 of the reflector 504 are driven by the driving device corresponding to the three operation pattern waveforms in synchronization with the lighting of the three pairs of LEDs. . Thereby, each reflective curved surface is formed so that the position of the pair of each LED may be in the vicinity of the focus by the plurality of reflector pieces 503 moving in parallel or tilting.

  Below, the drive device of the reflector piece of the illuminating device concerning the 3rd Embodiment of this invention is demonstrated using FIG.5 (c).

  As shown in FIG. 5C, the driving device 505 includes a reflector piece 503 having four electrodes 510 provided at, for example, four corners on the back side having a metal mirror surface, and an outer peripheral surface of the reflector 504. And a holding plate 508 in which an electrode 511 is formed at a position facing the electrode 510. The holding plate 508 is bonded and fixed to a housing (not shown), and the holding plate 508 and the reflector piece 503 are connected by a spring 509 provided near the center thereof.

  With this configuration, the driving device 505 is driven by electrostatic force generated by a voltage applied between the opposing electrodes. For example, when the same polarity voltage is applied between the opposing electrodes, the paired electrodes 510 and 511 repel each other, and the reflector piece 503 operates away from the holding plate 508. Works to approach. At this time, if individual voltages are applied between the four opposing electrodes, the shape can be changed to an arbitrary shape such as inclination or parallel movement.

  Through the above operation, the reflector 504 can form a reflection curved surface with the positions of the three pairs of LEDs 507 as focal points, and collects light in the vicinity of the same common focal point 502 regardless of the time-division lighting of the LEDs 507. Can do.

  In the present embodiment, an example in which electrostatic force is used as the driving device has been described. However, the present invention is not limited to this. Needless to say, a magnetic force such as an electromagnet can be used. Moreover, you may drive a several reflector piece with the drive device using the piezoelectric material element demonstrated in 1st Embodiment.

  According to the present embodiment, the light quantity and the luminance can be greatly increased by the configuration of the LEDs 507 provided in pairs in the vertical direction using the reflectors 504 having the reflective curved surfaces provided in the vertical direction.

  Moreover, since the reflector piece is driven using electrostatic force or magnetic force, the amount of movement of the reflector piece can be increased. Therefore, the number of semiconductor light-emitting elements to be mounted can be greatly increased, and thus a long-life and highly reliable lighting device in which the driving time and heat generation amount of each LED are further reduced can be realized by time-division driving. In addition, since each LED is cooled during the non-lighting time, the lighted LED can be driven with a current value close to the limit, and an illumination device with higher brightness can be obtained.

  Further, even if a large light source composed of a plurality of LEDs is used, it is not necessary to provide a reflector corresponding to each LED, so that a compact and high-luminance illumination device with a small light source can be realized.

  In each of the above embodiments, the LED is described in the vicinity of the focal point of the reflection curved surface of the reflector. However, the present invention is not limited to this. For example, it is good also as a structure which arrange | positions in the center of the rear part of the reflective curved surface of a reflector like a prior art example, reflects with a reflector, and irradiates light ahead. Thereby, an easily adjustable illumination device can be realized.

  The present invention is not only a headlight for vehicles such as automobiles and two-wheeled vehicles using semiconductor light-emitting elements, but also a small and high-capacity light whose intensity, direction, distance, etc. can be freely changed by an illumination unit placed at a fixed position. It is useful as a luminance lighting device.

(A) Whole block diagram which removed the housing | casing of the illuminating device concerning the 1st Embodiment of this invention (b) The block diagram which shows the light source unit of the illuminating device concerning the 1st Embodiment of this invention. Sectional structure and operation explanatory drawing of the illuminating device concerning the 2nd Embodiment of this invention. Timing chart for driving a plurality of LEDs of the illumination device according to the second embodiment of the present invention (A) The perspective view which shows the light source unit which comprises the illuminating device concerning the 2nd Embodiment of this invention (b) Another example of the light source unit which comprises the illuminating device concerning the 2nd Embodiment of this invention A perspective view showing Schematic block diagram of the illuminating device concerning the 3rd Embodiment of this invention. Schematic sectional view for explaining the configuration of a conventional vehicle headlamp unit

Explanation of symbols

101, 201, 501 Lens 102, 202, 502 Focus 103, 204, 204a, 204b, 503 Reflector piece 104, 504 Reflector 105, 505 Driving device 106, 403, 404, 405, 406, 407, 408, 506 Radiator 107 , 206, 207, 208, 507 Semiconductor light emitting element 203 Housing wall 205 Piezoelectric element 209, 210, 211 Reflection curved surface 212, 216 Light shielding plate 213, 214, 512 Optical path 215, 515 Base 301, 302, 303, 307 304,305,306 Operation pattern waveform 401,402 Light source unit 508 Holding plate 509 Spring 510,511 Electrode

Claims (7)

A plurality of semiconductor light emitting elements;
A reflector that drives the plurality of semiconductor light emitting elements in a time-sharing manner and reflects light emitted from each of the semiconductor light emitting elements;
Comprising at least
The reflection curved surface of the reflector is composed of a plurality of reflector pieces that can change the reflection curved surface, and the reflector piece is varied in synchronization with light emitted from the semiconductor light emitting element driven in a time division manner to be in the vicinity of the focal point. An illuminating device characterized by condensing and irradiating the light forward through a lens disposed in front of the reflection curved surface. The lighting device according to claim 1, wherein the semiconductor light emitting element is disposed on a base, and the base is connected to a heat radiator provided outside the reflector. The lighting device according to claim 2 , wherein the plurality of semiconductor light emitting elements are individually provided on the base. The reflector piece, the lighting device according to any one of claims 1 to 3, characterized in that it is varied by expansion and contraction of the plurality of piezoelectric body provided on the reflector piece. The lighting device according to any one of claims 1 to 4 , wherein the reflector piece is variable by an electrostatic force or an electromagnetic force. A semiconductor light emitting element, and a reflector having a plurality of reflector pieces for reflecting light emitted from the semiconductor light emitting element;
A control method of a lighting device comprising at least
A plurality of the semiconductor light emitting elements are arranged, the plurality of semiconductor light emitting elements are driven in a time division manner, and the reflector piece is synchronized with light emitted from the semiconductor light emitting elements driven in a time division manner. And variably controlled to form a reflection curved surface of the reflector,
An illumination device control method, comprising: performing optical path control by reflecting the light emitted from the semiconductor light emitting element in a predetermined direction . When the input values applied to the plurality of semiconductor light emitting elements that are driven in time division are individually measured when the semiconductor light emitting elements are turned on and change from predetermined voltage values and current values, the semiconductor light emitting elements 7. The method of controlling the lighting device according to claim 6 , wherein the input value is individually varied and controlled so as to be the predetermined voltage value and current value.

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