JP2019200941A - Luminaire - Google Patents

Abstract

To acquire a luminaire capable of changing a light distribution angle in a wide range.SOLUTION: A luminaire includes a light source unit and a control part. The light source unit includes: a light source module including a central light source and a peripheral light source provided around the central light source; a dimmer film which is provided in the light emission direction of the light source module and in which the state is switched between a transmission state and a diffusion state by a voltage being applied; and a lens provided in the light emission direction of the light source module. The control part adjusts a current ratio of the current flowing in the peripheral light source with respect to the current flowing in the central light source, and switches the state of the dimmer film between the transmission state and the diffusion state.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device.

  Patent Document 1 discloses a lighting device having a one-core lens and a module substrate on which an LED (Light Emitting Diode) is mounted. A first LED is arranged at the center of the module substrate, and a second LED is arranged around the first LED. By arranging in this way, the light emitted from the first LED can be made light with high directivity, and the light emitted from the second LED can be made light with low directivity. In Patent Document 1, the light distribution is controlled by controlling the current supplied to each light source group having different directivity of emitted light.

Japanese Patent Laying-Open No. 2015-82474

  In general, in a lighting fixture such as a spotlight or a downlight, the light distribution may be fixed. In such a luminaire, in order to freely change the light distribution, the light distribution angle may be controlled by adjusting the distance between the light source and the lens manually or electrically.

  In the manual adjustment method, a person goes up to a high place to adjust the position of the lens, which is difficult to work and may be troublesome. In addition, when the lens position is adjusted by a motor, there is a possibility that the apparatus becomes large because the motor is installed. In addition, a motor and a circuit for driving the motor are required, which may increase costs.

  On the other hand, Patent Document 1 proposes to adjust the light distribution electrically. In this case, a motor or the like is not necessary, and light distribution can be adjusted while suppressing space. However, Patent Document 1 does not clearly indicate the fluctuation range of the light distribution angle. Moreover, there is a possibility that the range of the light distribution angle that can be adjusted is narrowed only by controlling the current supplied for each light source group. In conventional products, the range of the light distribution angle that can be adjusted is often about 15 to 30 °, for example.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an illumination device capable of changing a light distribution angle in a wide range.

  An illumination device according to the present invention includes a light source unit and a control unit, and the light source unit includes a central light source, a peripheral light source provided around the central light source, and the light source module. A light control film that is switched between a transmission state and a diffusion state when a voltage is applied, and a lens provided in the light emission direction of the light source module. The control unit adjusts a current ratio of a current flowing through the peripheral light source to a current flowing through the central light source, and switches the state of the light control film between the transmission state and the diffusion state.

  In the illumination device according to the present invention, the light distribution angle is adjusted by controlling the current ratio of the current flowing through the peripheral light source to the current flowing through the central light source and the state of the light control film. Thereby, a light distribution angle can be changed in a wide range.

1 is an exploded perspective view of a lighting device according to Embodiment 1. FIG. 3 is a plan view of the light source module according to Embodiment 1. FIG. 1 is a circuit block diagram of a lighting device according to Embodiment 1. FIG. It is sectional drawing which shows the locus | trajectory of the light ray when the light control film is a permeation | transmission state in the illuminating device which concerns on Embodiment 1. FIG. It is sectional drawing which shows the locus | trajectory of the light ray when the light control film is a diffusion state in the illuminating device which concerns on Embodiment 1. FIG. It is an average light distribution when the light control film which concerns on Embodiment 1 is made into a permeation | transmission state, and only a center light source is turned on. It is an average light distribution when the light control film which concerns on Embodiment 1 is made into a permeation | transmission state, and a center light source and a peripheral light source are turned on. It is a light distribution when a light control film according to Embodiment 1 is in a diffusion state and a central light source and a peripheral light source are turned on. It is an illuminance distribution at the time of making the light control film which concerns on Embodiment 1 into a permeation | transmission state, and lighting only a center light source. It is an illuminance distribution at the time of making the light control film which concerns on Embodiment 1 into a permeation | transmission state, and turning on a center light source and a peripheral light source. It is illuminance distribution at the time of making the light control film which concerns on Embodiment 1 into a diffused state, and turning on a center light source and a peripheral light source. 6 is an exploded perspective view of a lighting device according to Embodiment 2. FIG. It is an average light distribution when the light control film which concerns on Embodiment 2 is made into a diffused state, and only a center light source is turned on. It is an average light distribution when the light control film which concerns on Embodiment 2 is made into a diffused state, and only a peripheral light source is lighted. 6 is a plan view of a light source module according to Embodiment 3. FIG. It is an illuminance distribution at the time of making the light control film which concerns on Embodiment 3 into a permeation | transmission state, and turning on a center light source and a peripheral light source. 6 is a plan view of a light source module according to Embodiment 4. FIG. It is an average light distribution when a light control film according to Embodiment 4 is in a diffusion state and a central light source and a peripheral light source are turned on. It is illumination intensity distribution at the time of making the light control film which concerns on Embodiment 4 into a diffused state, and turning on a center light source and a peripheral light source. It is an illuminance distribution at the time of making the light control film which concerns on Embodiment 4 into a permeation | transmission state, and turning on a center light source and a peripheral light source. FIG. 10 is an exploded perspective view of a lighting device according to Embodiment 5. It is an illuminance distribution at the time of making the light control film which concerns on Embodiment 5 into a permeation | transmission state, making a light control film with an opening into a diffused state, and turning on a center light source and a peripheral light source.

  An illumination device according to an embodiment of the present invention will be described with reference to the drawings. The same or corresponding components are denoted by the same reference numerals, and repeated description may be omitted.

Embodiment 1 FIG.
FIG. 1 is an exploded perspective view of lighting apparatus 100 according to Embodiment 1. FIG. The illumination device 100 includes a light source unit 10 and a housing 4. The light source unit 10 includes a lens 1, a light control film 2, and a light source module 3. The housing 4 houses the light source unit 10. The illumination device 100 is used as, for example, a spotlight or a downlight.

  The lens 1 is provided in the light emitting direction of the light source module 3 and controls the light distribution. The lens 1 is rotationally symmetric. The lens 1 is also called a one-core lens. The structure of the lens 1 is not limited to that shown in FIG.

  The light control film 2 is provided in the light emission direction of the light source module 3. In the present embodiment, the light control film 2 is provided between the lens 1 and the light source module 3. The state of the light control film 2 is switched between a transmission state and a diffusion state by applying a voltage.

  The light control film 2 is a liquid crystal drive, for example. The light control film 2 becomes transparent when an AC voltage is applied, and becomes cloudy when the AC voltage is turned off. The state where the light control film 2 is clouded is a diffusion state. Moreover, the density of the white turbidity of the light control film 2 can be adjusted with the magnitude | size of the voltage to apply. The light control film 2 may become cloudy when a voltage is applied, and may be transparent when the AC voltage is turned off. Not only this but the light control film 2 should just switch the state which permeate | transmits light, and the state to which it diffuses according to a voltage.

  A plurality of light sources are arranged in the light source module 3. Center points of the plurality of light sources are provided on the central axis of the lens 1. The plurality of light sources are, for example, LEDs. The plurality of light sources may be LEDs for surface mounting or LEDs called CSP (Chip Scale Package). The CSP can pass a larger current than the LED for surface mounting.

  FIG. 2 is a plan view of the light source module 3 according to the first embodiment. The light source module 3 includes a substrate 33, a central light source 31 and a peripheral light source 32 mounted on the substrate 33. Each of the central light source 31 and the peripheral light source 32 has a plurality of light sources. The peripheral light source 32 is provided around the central light source 31. A light source group surrounded by an inner dotted circle among the dotted circles depicted in FIG. A light source group within a range between two dotted circles is referred to as a peripheral light source 32.

  The surface of the substrate 33 is coated with a reflective agent called a resist. The light source module 3 is in close contact with the housing 4 by screws or the like. Thereby, the heat generated in the light source module 3 can be released to the housing 4.

  The central light source 31 is provided in the central part of the substrate 33. The central light source 31 is provided so that the central axis overlaps the optical axis of the lens. The central light source 31 is formed from a plurality of light sources densely arranged in a disk shape. By using CSP as the light source, the light source can be reduced in size, and the diameter of the central light source 31 can be reduced. For this reason, it is advantageous for producing a narrow-angle light distribution.

  The peripheral light source 32 is provided in an annular shape. The lighting device 100 is designed so that the light distribution angle is 30 ° or more. For this reason, the peripheral light source 32 has a double annular shape. Here, the light distribution angle is an angle between two directions at which the luminous intensity is ½ of the maximum luminous intensity of the light emitted from the lighting device 100. In the illumination field, this light distribution angle is called a 1/2 beam angle. That is, the light distribution angle is the sum of the positive angle at which the light emitted from the lighting device 100 is ½ of the maximum luminous intensity and the absolute value of the negative angle. In order to obtain a wide light distribution angle with a light distribution angle of 30 ° or more, an outer annular light source among the peripheral light sources 32 is required. Further, in order to obtain a light distribution with a Gaussian distribution at a light distribution angle of 30 ° or less, an inner annular light source among the peripheral light sources 32 is also required.

  The peripheral light source 32 includes a plurality of first light sources 32a surrounding the central light source 31 in an annular shape and a plurality of second light sources 32b surrounding the plurality of first light sources 32a in an annular shape. Nine first light sources 32a are provided, and 16 second light sources 32b are provided. As shown in FIG. 2, the plurality of first light sources 32a are provided at positions shifted from the plurality of second light sources 32b in the radial direction of the ring formed by the first light sources 32a. In the peripheral light source 32, every other light source may be arranged in the circumferential direction of the inner ring and the outer ring. Further, the number of the first light sources 32a and the second light sources 32b may be other than the number described above.

  With such an arrangement of the peripheral light sources 32, a smooth light distribution can be obtained when the same current is supplied to the plurality of first light sources 32a and the plurality of second light sources 32b. Moreover, as will be described later, it is possible to obtain illumination light in which the light control film 2 forms moderate illuminance unevenness in the transmissive state and the light control film 2 suppresses illuminance unevenness in the diffused state. In addition, the number of used light sources is halved and the cost can be reduced as compared with the case where the light sources are arranged closely.

  The radius of the inner ring of the peripheral light source 32 may be 1.2 to 1.6 times the outermost peripheral radius of the central light source 31 drawn by the inner dotted line. Further, the radius of the annular ring outside the peripheral light source 32 may be 1.6 to 2.2 times the outermost peripheral radius of the central light source 31. In the present embodiment, the opening radius on the light incident surface side of the lens 1 is about three times the outermost radius of the central light source 31. Further, the radius of the outer ring of the peripheral light source 32 is smaller than the opening radius of the lens 1 on the light incident surface side.

  FIG. 3 is a circuit block diagram of lighting apparatus 100 according to Embodiment 1. The lighting device 100 includes a DC power supply unit 30 that supplies DC power to the central light source 31 and the peripheral light source 32. The DC power supply unit 30 supplies direct current to the central light source 31 and the peripheral light source 32 individually, and turns on the central light source 31 and the peripheral light source 32 individually. Further, the AC power supply unit 20 applies an alternating voltage to the light control film 2 and adjusts the applied voltage to switch between the transmission state and the diffusion state.

  The lighting device 100 includes a control unit 40. The control unit 40 controls the DC power supply unit 30 and adjusts the current flowing through the central light source 31 and the peripheral light source 32. The controller 40 adjusts the ratio of the current flowing through the peripheral light source 32 to the current flowing through the central light source 31. Moreover, the control part 40 controls the AC power supply part 20, and switches the state of the light control film 2 between a permeation | transmission state and a spreading | diffusion state.

  FIG. 4 is a cross-sectional view showing the locus of light rays when the light control film 2 is in the transmissive state in the illumination device 100 according to the first embodiment. FIG. 5 is a cross-sectional view showing the locus of light rays when the light control film 2 is in the diffusing state in the illumination device 100 according to the first embodiment. The function of the light control film 2 is demonstrated using FIG.

  In the present embodiment, the lens 1 is designed to have a narrow angle light distribution. For this reason, when the light control film 2 is in a transmissive state, the light emitted from the center of the lens 1 is emitted almost vertically from the light exit surface of the lens 1 as shown in FIG. On the other hand, when the light control film 2 is in the diffusion state, the light emitted from the light source module 3 is diffused by the light control film 2. Therefore, as shown in FIG. 5, the light is deflected and emitted as light diffused from the light exit surface of the lens 1.

  FIG. 6 shows an average light distribution when the light control film 2 according to Embodiment 1 is in a transmissive state and only the central light source 31 is turned on. Since the lens shape is designed to have a narrow angle, radiated light with a light distribution angle = 13 ° can be obtained. Here, the average light distribution is a light distribution obtained by averaging light rays having the same light distribution angle around the optical axis.

  FIG. 7 shows an average light distribution when the light control film 2 according to Embodiment 1 is in a transmissive state and the central light source 31 and the peripheral light source 32 are turned on. The peripheral light source 32 is at a position out of the focus of the lens 1. For this reason, the light radiated from the peripheral light source 32 is emitted more widely than the light radiated from the central light source 31. For this reason, by turning on the central light source 31 and the peripheral light source 32, radiated light having a light distribution angle of 32 ° can be obtained.

  FIG. 8 shows a light distribution when the light control film 2 according to Embodiment 1 is in a diffusing state and the central light source 31 and the peripheral light source 32 are turned on. As described with reference to FIGS. 4 and 5, the light is scattered by the light control film 2. For this reason, the light distribution angle further expands from the state of FIG. 7 to 34 °.

  FIG. 9 is an illuminance distribution when the light control film 2 according to Embodiment 1 is in a transmissive state and only the central light source 31 is turned on. At this time, rotationally symmetric illumination light having the narrowest light distribution corresponding to the average light distribution shown in FIG. 6 is obtained.

  FIG. 10 is an illuminance distribution when the light control film 2 according to Embodiment 1 is in a transmissive state and the central light source 31 and the peripheral light source 32 are turned on. As shown in FIG. 2, the peripheral light sources 32 are arranged in a double annular shape with a gap. For this reason, brightness unevenness occurs in the outer peripheral portion of the irradiated surface, reflecting the light and darkness of the light source.

  FIG. 11 is an illuminance distribution when the light control film 2 according to Embodiment 1 is in a diffusing state and the central light source 31 and the peripheral light source 32 are turned on. As the light is diffused by the light control film 2, uneven illuminance as shown in FIG. 10 is suppressed, and a smooth illuminance distribution can be obtained.

  Next, the operation of the lighting device 100 having such characteristics will be described. In the case of narrow-angle light distribution, the control unit 40 puts the light control film 2 in a transmissive state with the central light source 31 turned on and the peripheral light source 32 turned off. Thereby, a narrow-angle light distribution with a light distribution angle = 13 ° is obtained. In addition, the control unit 40 adjusts the brightness of the lighting device 100 by adjusting the current flowing through the central light source 31.

  When changing the light distribution angle from 13 ° to 32 °, the control unit 40 maintains the light control film 2 in a transmissive state, and increases the current ratio of the current flowing through the peripheral light source 32 to the current flowing through the central light source 31. Here, the greater the current ratio, the greater the light distribution angle. That is, the control unit 40 determines the light distribution angle based on the current ratio. Thereby, the light distribution angle can be changed from the first light distribution angle = 13 ° to the second light distribution angle = 32 °, which is larger than the first light distribution angle. Further, the control unit 40 adjusts the brightness of the lighting device 100 by changing the value of the current flowing through the central light source 31 and the peripheral light source 32 while keeping the current ratio constant.

  When changing the light distribution angle from 32 ° to 34 °, the control unit 40 maintains the current ratio and lowers the voltage applied to the light control film 2. Thereby, the light control film 2 switches from a permeation | transmission state to a diffusion state. As the applied voltage decreases, the light distribution angle increases. When the applied voltage = 0V, the light distribution angle reaches 34 °. That is, the light distribution angle can be changed from the second light distribution angle = 32 ° to the third light distribution angle = 34 °, which is larger than the second light distribution angle. Further, the control unit 40 adjusts the brightness of the lighting device 100 by changing the value of the current flowing through the central light source 31 and the peripheral light source 32 while keeping the current ratio constant.

  In this way, the lighting device 100 can be set to a target light distribution angle and brightness. In the present embodiment, the light distribution angle can be changed in a wide range by controlling the current ratio and the state of the light control film. Further, the light distribution angle can be continuously changed.

  In this Embodiment, the control part 40 maintains the light control film 2 in a permeation | transmission state or a spreading | diffusion state, and changes an electric current ratio. Moreover, the control part 40 switches the state of the light control film 2 between a permeation | transmission state and a spreading | diffusion state in the state which maintained the electric current ratio of the central light source 31 and the peripheral light source 32. FIG. Thereby, it is not necessary to control the state of the light control film 2 and a current ratio simultaneously, and control can be performed easily. However, the state of the light control film 2 may be changed while changing the current ratio.

  Further, when the light distribution angle is increased, the light control film 2 is switched from the transmission state to the diffusion state with only the central light source 31 turned on, and then the light control film 2 is maintained in the diffusion state to maintain the current. The ratio may be increased.

  When the illumination device 100 is used as a normal variable light distribution illumination device, the light control film 2 may be in a transmissive state only in the case of narrow-angle light distribution in which only the central light source 31 is turned on. At this time, narrow-angle light distribution can be obtained by not diffusing light. In the case of wide-angle light distribution that turns on the peripheral light source 32, unevenness in illuminance can be suppressed by diffusing the light.

  Further, at the light distribution angle obtained by turning on the peripheral light source 32, a voltage may be applied to the light control film 2 to make it transparent. That is, the control unit 40 may cause the light emitted from the light source unit 10 to have uneven illuminance by turning on the central light source 31 and the peripheral light source 32 while maintaining the light control film 2 in a transmissive state. At this time, it is possible to create an illumination distribution having a pattern depending on the arrangement of the light sources. This pattern can be used for space production. For example, as shown in FIG. 10, the lighting device 100 can produce an effect such as a sunbeams.

  Further, the control unit 40 may periodically change the current flowing to the peripheral light source 32. At this time, it is possible to produce an effect that makes the light of the lighting device 100 feel a natural light fluctuation. Furthermore, the control unit 40 may periodically vary the voltage applied to the light control film 2. Thereby, the illumination nonuniformity of the outer peripheral part of an irradiation surface fluctuates. At this time, the lighting device 100 can produce an effect that makes the user feel the change between sunny and cloudy weather indicated by direct sunlight.

  As a modification of the present embodiment, the peripheral light source 32 is not limited to a double annular shape, and may be a single or more annular shape according to a target light distribution angle. Not only this but the light source module 3 should just have the central light source 31 and the peripheral light source 32 provided in the circumference | surroundings of the central light source 31. FIG. For example, the peripheral light sources 32 may be arranged around the central light source 31 so as to form a polygon. The lens 1 may not be rotationally symmetric.

  These modifications can be applied as appropriate to the illumination devices according to the following embodiments. In addition, since there are many common points with Embodiment 1 about the illuminating device which concerns on the following embodiment, it demonstrates centering around difference with Embodiment 1. FIG.

Embodiment 2. FIG.
FIG. 12 is an exploded perspective view of lighting apparatus 200 according to Embodiment 2. FIG. The lighting device 200 includes a light source unit 210. The light source unit 210 includes a light control film 202. In the present embodiment, the light control film 202 is provided on the light exit surface side of the lens 1. The shape of the light control film 202 is set in accordance with the shape of the light exit surface of the lens 1. The light control film 202 is circular, for example. Other structures are the same as those in the first embodiment.

  Next, the light distribution angle obtained in this embodiment will be described. The light distribution angle when the light control film 202 is in a transmissive state and only the central light source 31 is turned on is 13 ° as in the first embodiment. FIG. 13 shows an average light distribution when the light control film 202 according to Embodiment 2 is in a diffusing state and only the central light source 31 is turned on. As the light is diffused by the light control film 202, the light distribution angle is expanded from 13 ° to 36 °.

  FIG. 14 shows an average light distribution when the light control film 202 according to the second embodiment is in a diffusing state and only the peripheral light source 32 is turned on. In lighting device 100 according to Embodiment 1, when only peripheral light source 32 is turned on, the brightness of the central portion decreases. On the other hand, in the present embodiment, a light distribution with a substantially flat luminous intensity at the center can be obtained. At this time, the light distribution angle is 56 °.

  Next, the light distribution control operation of the illumination device 200 will be described. First, in the case of narrow-angle light distribution, a voltage is applied to the light control film 202 so as to be transmissive, and only the central light source 31 is turned on. Next, when changing the light distribution angle from 13 ° to 36 °, the voltage applied to the light control film 202 is lowered. Thereby, the light distribution angle is widened, and when the applied voltage = 0V, the light distribution angle reaches 36 °. Further, the brightness of the lighting device 200 is adjusted by adjusting the current passed through the central light source 31.

  When changing the light distribution angle in the range of 32 ° to 56 °, the peripheral light source 32 is turned on together with the central light source 31. The control unit 40 determines the light distribution angle by changing the current ratio between the central light source 31 and the peripheral light source 32. Further, the control unit 40 adjusts the brightness of the lighting device 200 by changing the current values of the central light source 31 and the peripheral light source 32 while keeping the current ratio constant. At the light distribution angle = 56 °, the control unit 40 puts the light control film 202 in the diffusing state with the central light source 31 turned off and the peripheral light source 32 turned on.

  In the present embodiment, the control unit 40 maintains the current ratio and switches the light control film 202 from the transmission state to the diffusion state, thereby changing the light distribution angle from the fourth light distribution angle = 13 ° to the fourth light distribution angle. Larger than the fifth light distribution angle = 36 °. Further, the control unit 40 maintains the light control film 202 in the diffusion state and increases the current ratio, so that the light distribution angle is larger than the fifth light distribution angle from the fifth light distribution angle = the sixth light distribution angle = Change to 56 °.

  In the present embodiment, the light control film 202 is disposed at a position farther from the light source module 3 than in the first embodiment. For this reason, the effect of diffusion by the light control film 202 can be improved. Therefore, the light distribution angle can be changed in a wider range than in the first embodiment. Further, the light control film 202 is set in a diffused state in a wide-angle region where unevenness is likely to occur in the light emitted from the light source module 3. For this reason, the illumination nonuniformity of the light radiate | emitted from the illuminating device 200 can be suppressed.

  Moreover, in this Embodiment, since the effect of suppression of the illumination intensity nonuniformity by the light control film 202 can be improved, even if it turns on only the peripheral light source 32, it can prevent that the brightness of a center part falls. Thereby, a wide light distribution angle of 56 ° can be obtained in the present embodiment.

  Similarly to the first embodiment, the light control film 202 may be in a transmissive state at the light distribution angle on the wide angle side. Thereby, it is also possible to obtain an illuminance distribution such as a sunlight leaking through the periphery with uneven illuminance.

Embodiment 3 FIG.
FIG. 15 is a plan view of the light source module 303 according to the third embodiment. The light source module 303 is different from the second embodiment in the arrangement of light sources in the peripheral light source 332. The peripheral light source 332 includes a plurality of first light sources 32a surrounding the central light source 31 in an annular shape and a plurality of second light sources 32b surrounding the plurality of first light sources 32a in an annular shape. The plurality of first light sources 32a are aligned with the plurality of second light sources 32b in the radial direction of the ring formed by the plurality of first light sources 32a, respectively. Other structures are the same as those in the second embodiment.

  Even when the light source module 303 is used, the light distribution angle from 13 ° to 56 ° can be obtained similarly to the second embodiment because the light control film 202 disposed on the light exit surface side of the lens 1 has a high diffusion effect. . Further, the control unit 40 keeps the light control film 202 in a transmissive state and turns on the central light source 31 and the peripheral light source 332. Thereby, radial illuminance unevenness occurs in the light emitted from the light source unit 10.

  FIG. 16 is an illuminance distribution when the light control film 202 according to Embodiment 3 is in a transmissive state and the central light source 31 and the peripheral light source 332 are turned on. In the present embodiment, light sources are arranged in the radial direction in the peripheral light source 332, so that an illuminance distribution like a margaret petal is obtained.

  A plurality of light source modules having different light source arrangements may be used in combination. This makes it possible to create a special lighting space consisting of multiple types of patterns.

Embodiment 4 FIG.
FIG. 17 is a plan view of the light source module 403 according to the fourth embodiment. The light source module 403 includes a peripheral light source 432. The peripheral light source 432 is provided in a triple annular shape. The peripheral light source 432 includes a double annular peripheral light source 32 and an outermost peripheral light source 434 surrounding the peripheral light source 32.

  Moreover, the DC power supply unit 30 according to the first to third embodiments includes two systems of a central light source 31 and a peripheral light source 32 as power supply circuits that supply power to the light source module. On the other hand, in the present embodiment, three systems of a central light source 31, a peripheral light source 32, and an outermost peripheral light source 434 are provided as power supply circuits that supply power to the light source module 403. Other configurations are the same as those in the second embodiment.

  FIG. 18 shows an average light distribution when the light control film 202 according to Embodiment 4 is in a diffusing state and the central light source 31 and the peripheral light source 432 are turned on. FIG. 18 shows an average light distribution when the current ratio of the central light source 31, the peripheral light source 32, and the outermost peripheral light source 434 is 30: 1: 100. At this time, the light distribution angle is 92 °.

  FIG. 19 is an illuminance distribution when the light control film 202 according to the fourth embodiment is in a diffusing state and the central light source 31 and the peripheral light source 432 are turned on. FIG. 19 is an illuminance distribution corresponding to the average light distribution shown in FIG.

  Next, an operation of controlling the light distribution from the narrow angle light distribution to the wide angle light distribution of the lighting device using the light source module 403 will be described. In the case of narrow-angle light distribution, the control unit 40 applies a maximum voltage to the light control film 202 so as to transmit light, and turns on only the central light source 31. Thereby, a light distribution angle = 13 ° is obtained. In addition, the brightness of the lighting device is adjusted by adjusting the current passed through the central light source 31.

  When changing the light distribution angle in the range of 13 ° to 36 °, the control unit 40 decreases the voltage applied to the light control film 202 to widen the light distribution angle. When the applied voltage is 0 V, the light distribution angle is 36 °. In addition, the brightness of the lighting device is adjusted by adjusting the current passed through the central light source 31.

  When changing the light distribution angle in the range of 36 ° to 56 °, the peripheral light source 32 is turned on in addition to the central light source 31. The controller 40 controls the current ratio of the peripheral light source 32 to the central light source 31 to determine the light distribution angle. In addition, the control unit 40 adjusts the brightness of the lighting device by changing the current values of the central light source 31 and the peripheral light source 32 while keeping the current ratio constant.

  When the light distribution angle is changed in the range of 56 ° to 92 °, the light control film 202 is set in the diffusion state, and the outermost peripheral light source 434 is turned on in addition to the central light source 31 and the peripheral light source 32. The control unit 40 determines the light distribution angle based on the current ratio of the central light source 31, the peripheral light source 32, and the outermost peripheral light source 434. Further, the control unit 40 adjusts the brightness of the lighting device by keeping the current ratio constant and changing the current values of the central light source 31, the peripheral light source 32, and the outermost peripheral light source 434.

  Thus, in this Embodiment, a light distribution angle can be continuously fluctuated in the range of 13 degrees-90 degrees.

  Alternatively, the light control film 202 may be in a transmissive state, and the central light source 31, the peripheral light source 32, and the outermost peripheral light source 434 may be turned on. FIG. 20 is an illuminance distribution when the light control film 202 according to the fourth embodiment is in a transmissive state and the central light source 31 and the peripheral light source 432 are turned on. FIG. 20 is an illuminance distribution when the light control film 2 is in a transmissive state and the ratio of the current values of the central light source 31, the peripheral light source 32, and the outermost peripheral light source 434 is 30: 1: 100. At this time, an illuminance distribution like a gerbera petal is obtained. In this way, a special illumination space can be created by combining a plurality of light source groups having different light source arrangements.

  In the present embodiment, the peripheral light source 432 has a triple annular shape, but the peripheral light source 432 may be provided in four or more layers.

Embodiment 5. FIG.
FIG. 21 is an exploded perspective view of lighting apparatus 500 according to Embodiment 5. The illumination device 500 includes a light source unit 510. The light source unit 510 includes a light control film 505 with an opening. Other structures are the same as those in the fourth embodiment. The light control film 505 with an opening is provided in the light emission direction of the light source module 403. In the present embodiment, the light control film 505 with an opening is provided between the light control film 202 and the lens 1.

  As with the light control film 202, the state of the light control film 505 with an opening is switched between a transmission state and a diffusion state when a voltage is applied. The light control film 505 with an opening further has an opening 505 a that transmits light from the light source module 403. In the opening 505a, the liquid crystal layer at the center is cut out in a cross shape. In the opening 505a, the lower base material is exposed from the liquid crystal layer. In the opening 505a, a transmission state in which the light from the light source module 403 is transmitted is maintained regardless of whether or not a voltage is applied to the light control film 505 with the opening.

  In the present embodiment, the control unit 40 keeps the light control film 202 in a transmissive state, maintains the light control film 505 with an opening in a diffused state, and turns on the central light source 31 and the peripheral light source 432. Thereby, illuminance unevenness occurs in the light emitted from the light source unit 510.

  FIG. 22 shows the illuminance distribution when the light control film 202 according to the fifth embodiment is in the transmissive state, the light control film with aperture 505 is in the diffused state, and the central light source 31 and the peripheral light source 432 are turned on. Here, the current ratio of the central light source 31, the peripheral light source 32, and the outermost peripheral light source 434 is set to 30: 1: 100.

  As shown in FIG. 22, the present embodiment can create an illuminance distribution different from that of the fourth embodiment. In the present embodiment, for example, an illuminance distribution in which dot patterns are scattered around the cross pattern is obtained.

  The light control film 505 with an opening may be provided between the lens 1 and the light source module 403. Also in this case, the same illuminance distribution as in FIG. 21 is obtained. Further, the opening 505a is not limited to the cross shape, and may have a different shape according to the target illuminance distribution.

  The technical features described in each embodiment may be used in appropriate combination.

  1 lens, 2, 202 light control film, 3, 303, 403 light source module, 31 central light source, 32, 332, 432 peripheral light source, 33 substrate, 434 outermost peripheral light source, 4 housing, 505 light control film with aperture, 10 210, 510 Light source unit, 20 AC power supply unit, 30 DC power supply unit, 40 control unit, 50 dimmer, 100, 200, 500 Illumination device

Claims (13)

A light source unit;
A control unit;
With
The light source unit is
A light source module comprising: a central light source; and a peripheral light source provided around the central light source;
A light control film that is provided in the light emitting direction of the light source module and that switches between a transmission state and a diffusion state by applying a voltage,
A lens provided in the light emitting direction of the light source module;
With
The control unit adjusts a current ratio of a current flowing through the peripheral light source to a current flowing through the central light source, and switches the state of the light control film between the transmission state and the diffusion state. apparatus.   The lighting device according to claim 1, wherein the control unit changes the current ratio while maintaining the light control film in the transmission state or the diffusion state.   The lighting device according to claim 1, wherein the controller switches the state of the light control film between the transmission state and the diffusion state while maintaining the current ratio.   The control unit maintains the light control film in the transmissive state and increases the current ratio, thereby increasing the light distribution angle of the light source unit from the first light distribution angle to the second light distribution angle. The light distribution angle is changed from the second light distribution angle to the second light distribution angle by changing the light distribution angle and switching the light control film from the transmission state to the diffusion state while maintaining the current ratio. The illumination device according to any one of claims 1 to 3, wherein the lighting device is changed to a third light distribution angle that is larger than the first light distribution angle. The lens is rotationally symmetric;
The central light source is provided so that the central axis overlaps the optical axis of the lens,
The lighting device according to claim 1, wherein the peripheral light source is provided in an annular shape. Each of the central light source and the peripheral light source has a plurality of light sources,
The control unit causes the light emitted from the light source unit to generate illuminance unevenness by maintaining the light control film in the transmissive state and turning on the central light source and the peripheral light source. The lighting device according to any one of claims 1 to 5. The peripheral light source has a plurality of first light sources surrounding the central light source in an annular shape, and a plurality of second light sources surrounding the plurality of first light sources in an annular shape,
The plurality of first light sources are respectively aligned with the plurality of second light sources in a radial direction of an annulus formed by the plurality of first light sources,
The control unit generates radial illuminance unevenness in light emitted from the light source unit by turning on the central light source and the peripheral light source while maintaining the light control film in the transmissive state. The lighting device according to any one of claims 1 to 6.   The illumination device according to any one of claims 1 to 7, wherein the peripheral light source is provided in an annular shape having a radius smaller than an opening radius on the light incident surface side of the lens. A light control film with an opening provided in the light emitting direction of the light source module, the state being switched between a transmission state and a diffusion state by applying a voltage, and having an opening for transmitting light from the light source module With
The control unit emits light from the light source unit by maintaining the light control film in the transmissive state, maintaining the light control film with openings in a diffused state, and turning on the central light source and the peripheral light source. The illumination device according to any one of claims 1 to 8, wherein illuminance unevenness is generated in the light. The light control film is provided on the light exit surface side of the lens,
The lighting device according to claim 9, wherein the light control film with an opening is provided between the light control film and the lens. The light control film is provided on the light exit surface side of the lens,
The lighting device according to claim 9, wherein the light control film with an opening is provided between the lens and the light source module.   The lighting device according to any one of claims 1 to 9, wherein the light control film is provided between the lens and the light source module.   The lighting device according to any one of claims 1 to 11, wherein the light control film is provided on a light exit surface side of the lens.

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