WO2013027852A1 - Lighting device - Google Patents

Lighting device Download PDF

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Publication number
WO2013027852A1
WO2013027852A1 PCT/JP2012/071740 JP2012071740W WO2013027852A1 WO 2013027852 A1 WO2013027852 A1 WO 2013027852A1 JP 2012071740 W JP2012071740 W JP 2012071740W WO 2013027852 A1 WO2013027852 A1 WO 2013027852A1
Authority
WO
WIPO (PCT)
Prior art keywords
lens
lighting
mounting member
condensing lens
lighting device
Prior art date
Application number
PCT/JP2012/071740
Other languages
French (fr)
Inventor
Takayuki Ikeda
Original Assignee
Yazaki Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yazaki Corporation filed Critical Yazaki Corporation
Publication of WO2013027852A1 publication Critical patent/WO2013027852A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V17/00—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages
    • F21V17/02—Fastening of component parts of lighting devices, e.g. shades, globes, refractors, reflectors, filters, screens, grids or protective cages with provision for adjustment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/70—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose
    • B60Q3/74—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose for overall compartment lighting; for overall compartment lighting in combination with specific lighting, e.g. room lamps with reading lamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/70—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose
    • B60Q3/76—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by the purpose for spotlighting, e.g. reading lamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/80—Circuits; Control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/02—Controlling the distribution of the light emitted by adjustment of elements by movement of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V14/00—Controlling the distribution of the light emitted by adjustment of elements
    • F21V14/06—Controlling the distribution of the light emitted by adjustment of elements by movement of refractors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/02—Fastening of light sources or lamp holders with provision for adjustment, e.g. for focusing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a lighting device in which a light emitted from a light source is incident from an incident surface of a condensing lens and in which a light that is condensed through a condensing lens is emitted from an emitting surface of the condensing lens.
  • a lighting device in which a light emitted from a light source is incident from an incident surface of a condensing lens and in which a light that is condensed through a condensing lens is emitted from an emitting surface of the condensing lens.
  • a lighting device it is possible to generate a predetermined lighting area at a target lighting position by appropriately setting a distance between an emitting surface of the light source and the incident surface of the condensing lens.
  • a vehicle interior lighting lamp that is capable of changing a light distribution characteristic depending on a model of car is proposed.
  • a spacer is provided between a circuit board mounted with a light source and a condensing lens so that it is possible to control a distance between an emitting surface of the light source and an incident surface of the condensing lens. For this reason, even when the distance between the vehicle interior lighting lamp and the position of the driver's hand varies according to a model of car, the position of the driver's hand is illuminated by light of the predetermined lighting area according to a model of car.
  • a lighting device having a spacer of different thickness must be provided according to a distance between the vehicle interior lighting lamp and the target lighting position. As a result, there is possibility in that the number of lighting devices to be mounted is increased.
  • the present invention has been made in view of the above circumstances. It is an object to provide a lighting device that is capable of making it possible to reduce the number of lighting devices to be mounted.
  • a first aspect of this invention is provided with a lighting device comprising a light source including an emitting surface emitting a light, a condensing lens including an incident surface on which the light that is emitted from the light source is incident and an emitting surface emitting a light that is condensed through the condensing lens, and a lens moving mechanism moves the condensing lens so as to change a distance between the incident surface of the condensing lens and the emitting surface of the light source.
  • the lens moving mechanism has a lens gear that is provided on a side of the condensing lens, and a driving gear rotating while being meshed with the lens gear under a state that a relative position between a center axis of the driving gear and the light source is remained constant.
  • the lens moving mechanism has a lens driving motor for rotating the driving gear
  • the lighting device has a motor control unit for controlling driving of the lens drive motor
  • the lighting device comprises a mounting member to which the light source and the lens moving mechanism are to be mounted, and a mounting member moving mechanism that moves the mounting member in a plane that is perpendicular to a moving direction of the condensing lens.
  • the lighting device has the lens moving mechanism moving the condensing lens so as to change a distance between the incident surface of the condensing lens and the emitting surface of the light source. Therefore, a target lighting position and a lighting area can be adjusted by one lighting device. As a result, the number of lighting devices to be mounted can be reduced.
  • the lens moving mechanism has a lens gear that is provided on a side of the condensing lens, and a driving gear rotating while being meshed with the lens gear under a state that a relative position between a center axis of the driving gear and the light source is remained constant. Therefore, the distance between the incident surface of the condensing lens and the emitting surface of the light source can be changed by a simple configuration using the gears.
  • the lens moving mechanism has a lens driving motor for rotating the driving gear
  • the lighting device has a motor control unit for controlling driving of the lens drive motor. Accordingly, the target lighting position and the lighting area can be automatically changed.
  • the lighting device comprises a mounting member to which the light source and the lens moving mechanism are to be mounted, and a mounting member moving mechanism that moves the mounting member in a plane that is perpendicular to a moving direction of the condensing lens.
  • the target lighting position can be changed in a front-back direction as well as in a horizontal direction.
  • Fig. 1 shows a schematic diagram of a lighting device of a first embodiment of the present invention
  • Fig. 2 shows an exploded perspective view of a lighting unit of the lighting device shown in Fig. 1 ;
  • Fig. 3 shows a diagram for explaining a change in light distribution characteristic that will be induced by occurrence of a change in distance between an emitting surface of an LED and an incident surface of a condensing lens
  • Fig. 4 shows a flowchart showing procedures by which a motor control unit controls a lens driving motor and a mounting member driving motor according to a lighting mode
  • Fig. 5 shows a schematic diagram of a lighting device of a modification of the first embodiment of the present invention
  • Fig. 6 shows a schematic diagram of a lighting device of a second embodiment of the present invention.
  • Fig. 1 shows a schematic diagram of a lighting device 1 of a first embodiment of the present invention.
  • Fig. 2 shows an exploded perspective view of a lighting unit 10 of the lighting device 1 shown in Fig. 1.
  • Fig. 3 shows a diagram for explaining a change in light distribution characteristic that will be induced by occurrence of a change in distance between an incident surface
  • directions of arrows that intersect at right angels in the drawings are taken as a vertical direction, a front-back direction, and a horizontal direction, respectively.
  • the lighting device 1 of the first embodiment of the present invention is; for instance, a so-called vehicle interior lighting device to be mounted on an indoor ceiling of a vehicle.
  • the vehicle interior lighting device is configured such that a light emitted from an emitting surface 21a of an LED (Light Emitting Diode) 21 that is served as a light source is incident from the incident surface 23a of the condensing lens 23 and a light that is condensed through the condensing lens 23 is emitted from an emitting surface 23b of the condensing lens 23.
  • LED Light Emitting Diode
  • the lighting device 1 comprises the lighting unit 10, a motor control unit 70, and an operation input unit 80.
  • the lighting unit 10 comprises a lighting function unit 20, a moving mechanism 30, and a bezel 60.
  • the lighting function unit 20 includes the LED 21 that is served as the light source, a circuit board 22 mounted with the LED 21 , and the condensing lens 23 for condensing light that is emitted from the LED 21.
  • the circuit board 22 is configured from a so-called printed wiring board, and a conductor pattern, like a power circuit for feeding electric power to the LED 21 , is formed on the circuit board 22.
  • the circuit board 22 is connected to a signal line or an electrical wire, like a feeder line, via an un-illustrated terminal formed on the board.
  • the light emitting surface 21a is provided on a surface of a box-shaped package, and an un-illustrated power input terminal is connected to an un-illustrated power circuit of the circuit board 22.
  • the LED 21 is lighted up upon being supplied with electric power via the power circuit.
  • the condensing lens 23 is a hemispherical lens made from polycarbonate, or the like. When the light is incident from the incident surface 23a, the condensed light is emitted from the hemispherical emitting surface 23b.
  • traveling directions of light is expressed by symbols L1 and L2, when the incident surface 23a of the condensing lens 23 is situated at positions P1 and P2, respectively.
  • Light that is emitted from the emitting surface 21a of the LED 21 is incident from the incident surface 23a of the condensing lens 23.
  • the incident light is inflected according to Snell's theorem until the light is emitted from the emitting surface 23b of the condensing lens 23.
  • the moving mechanism 30 comprises a mounting member 31 , a lens moving mechanism 40, and a mounting member moving mechanism 50.
  • the mounting member 31 is a table on which the circuit board 22 to be mounted with the LED 21 and the lens moving mechanism 40 are provided. Specifically, the mounting member 31 is a table on which the LED 21 served as the light source and the lens driving mechanism are to be mounted.
  • the mounting member 31 is made of a plate-like member having a substantially C-shaped form when viewed from above.
  • a driving motor to be described later is attached to one end 31a of the mounting member 31 , and a mounting member gear 51 that is a rack is attached to anther end 31 b of the mounting member 31.
  • An arm 31c is provided between the one end 31a and the other end 31b.
  • the lens moving mechanism 40 moves the condensing lens 23 so as to changes a distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21.
  • the lens moving mechanism 40 comprises a lens gear 41 that is a gear provided on a side 23c of the condensing lens 23, an driving gear 42 that is rotated while being engaged with the lens gear 41 under a state that a relative position between a center axis of the driving gear 42 and the LED 21 is remained constant, thereby moving the condensing lens 23, and a lens driving motor 43 that rotates the driving gear 42.
  • the lens gear 41 is a rack for linear movements.
  • the driving gear 42 is connected to a motor shaft of the lens driving motor 43 and vertically moves the condensing lens 23 by the lens gear 41 when the driving gear 42 is rotated by the lens driving motor 43.
  • the condensing lens 23 When the condensing lens 23 is moved upward by the lens moving mechanism 40, the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 becomes shorter as shown in Fig. 3, the lighting area of the light emitted from the emitting surface 23b of the condensing lens 23 becomes broadened.
  • the condensing lens 23 when the condensing lens 23 is moved downward, the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 becomes greater, so that the lighting area of the light emitted from the emitting surface 23b of the condensing lens 23 becomes narrower.
  • the mounting member moving mechanism 50 moves the mounting member 31 within a plane that is perpendicular to a moving direction of the condensing lens 23.
  • the mounting member moving mechanism 50 moves the mounting member 31 in a front-back direction that is perpendicular to the vertical direction that is the moving direction of the condensing lens 23.
  • the mounting member moving mechanism 50 is a rack mounted on the mounting member 31.
  • the mounting member moving mechanism 50 comprises the mounting member gear 51 , a transmission gear 52 to mesh with the mounting member gear 51 , a mounting member driving gear 53 that rotates the mounting member gear 51 when the mounting member driving gear 53 is meshed with the transmission gear 52, and a mounting member driving motor 54 for rotating the mounting member driving gear 53.
  • the mounting member moving mechanism 50 When the mounting member moving mechanism 50 is actuated by the mounting member moving motor 54, the mounting member driving gear 53 is rotated, whereupon the mounting member 31 is moved in a front-back direction by the transmission gear 52.
  • the mounting member 31 , the lens moving mechanism 40, and the mounting member moving mechanism 50 are assembled into a frame 90 formed so as to retain them at respective predetermined fixed positions or within respective moving ranges.
  • the mounting member 31 , the lens moving mechanism 40, and the mounting member moving mechanism 50 are retained and fixed within the bezel 60 by the frame 90.
  • the bezel 60 retains therein the lighting function unit 20 and the moving mechanism 30 and is mounted to an indoor ceiling of a vehicle.
  • the bezel 60 has a window 61 that is formed in an indoor surface 60a and is made of an optically transparent member. The light emitted from the condensing lens 23 pass toward an interior through the windows 61.
  • the motor control unit 70 is now described.
  • the motor control unit 70 is embodied from a CPU or the like.
  • the motor control unit 70 is electrically connected to the lens driving motor 43, the mounting member driving motor 54, and the operation input unit 80. On the basis of a signal output from the operation input unit 80, the motor control unit 70 controls driving of the lens driving motor 43 and the mounting member driving motor 54.
  • the operation input unit 80 is now described.
  • the operation input unit 80 is embodied from a switch mechanism that enables pressing operation and outputs lighting mode selection information to the motor control unit 70.
  • the lighting mode includes; for instance, a handy lighting mode for lighting driver's hands, a handy spot lighting mode for lighting the hands in a lighting area that is narrower than a lighting area achieved in the hand lighting mode, and a foot lighting mode for lighting a driver's foot.
  • the hand lighting mode and the hand spot lighting mode are lighting modes for controlling a width of the lighting area achieved at the driver's hand that is the target lighting position.
  • the condensing lens 23 is moved further downward in the hand spot lighting mode than in the hand lighting mode.
  • the lighting device 1 thereby lights the driver's hand with light in an area that is narrower than the lighting area achieved in the hand lighting mode.
  • the target lighting position is a driver's foot.
  • the mounting member 31 is moved in a front-back direction to a position where the foot is easily lighted, and the condensing lens 23 is moved further downward than in the hand lighting mode.
  • the lighting device 1 lights the driver's foot in the hand lighting mode within the area equal to the lighting area.
  • the lighting device 1 automatically controls driving of the lens driving motor 43 and the mounting member driving motor 54, whereby the target lighting position and the lighting area are automatically controlled according to the lighting mode.
  • FIG. 4 is a flowchart showing procedures by which the motor control unit 70 controls the lens driving motor 43 and the mounting member driving motor 54 according to the lighting mode.
  • the motor control unit 70 determines whether or not lighting mode selection information has been output from the operation input unit 80 (step S101). When the lighting mode selection information has been output from the operation input unit 80 (Yes in step S101), the motor control unit 70 generates a drive control signal conforming to a selected lighting mode for the lens driving motor 43 and the mounting member driving motor 54 (step S102).
  • the motor control unit 70 outputs the generated drive control signal to the lens driving motor 43 and the mounting member driving motor 54 (step S103).
  • the lens driving motor 43 and the. mounting member driving motor 54 are thereby actuated in conformance with the selected lighting mode, whereupon the condensing lens 23 is vertically moved and whereupon the mounting member 31 is moved front and back.
  • step S101 a processing is transferred to step S101 by the motor control unit 70 so that the above-mentioned processing is repeated.
  • step S101 when the lighting mode selection information is not output from the operation input unit 80 in step S101 (No in step S101), the motor control unit 70 repeats determination processing pertaining to step S101.
  • the lighting device 1 of the embodiment of the present invention has the lens moving mechanism 40 that changes the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 by moving the condensing lens 23. Accordingly, by only one lighting device 1 , it is possible to change the target lighting position and the lighting area. As a result, the number of lighting devices to be mounted can be reduced.
  • the lens moving mechanism 40 comprises the lens gear 41 that is a gear provided on the side 23c of the condensing lens 23 and the driving gear 42 rotating while meshing with the lens gear 41 under a state under a state that a relative position between a center axis of the driving gear 42 and the LED 21 is remained constant. Accordingly, the lighting device 1 of the embodiment of the present invention can change the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 by a simple configuration using the gears.
  • the lens moving mechanism 40 comprises a lens driving motor 43 for rotating the driving gear 42, and the lighting device 1 has a motor control unit for controlling driving of the lens drive motor 43. Accordingly, the target lighting position and the lighting area can be automatically changed.
  • the lighting device 1 of the embodiment of the present invention additionally has the mounting member 31 to which the LED 21 and the lens moving mechanism 40 are to be mounted d and the mounting member moving mechanism 50 that moves the mounting member 31 in a front-back direction within the direction that is perpendicular to the moving direction of the condensing lens 23. Accordingly, the target lighting position can be changed in the front-back direction as well as in the vertical direction.
  • FIG. 5 is a schematic diagram of the lighting device 2 of the modification of the first embodiment of the present invention.
  • the lighting device 2 of the modification differs from the lighting device 1 of the first embodiment in that the motor control unit 70 is connected to a vehicle information output unit 81 that outputs information about respective units of the vehicle.
  • the modification is analogous to the embodiment in terms of the other structural configuration. Component parts that are identical with their counterparts in the embodiment are assigned the same reference numerals.
  • the motor control unit 70 controls the lens driving motor 43 and the mounting member driving motor 54 so as to affect lighting in conformance with vehicle information output from the vehicle information output unit 81.
  • the vehicle information output from the vehicle information output unit 81 includes; for instance, seat belt-buckle status information showing whether or not a seat belt is buckled.
  • the motor control unit 70 controls for instance, the lens driving motor 43 and the mounting member driving motor 54 so as to light a position of a coupling unit of the seat belt with spot light.
  • the lighting device 2 of the modification can yield the same advantage as that yielded by the lighting device 1 of the first embodiment.
  • FIG. 6 shows a schematic diagram of the lighting device 3 of the second embodiment of the present invention.
  • the lighting device 3 of the second embodiment of the present invention differs from the lighting device 1 of the first embodiment in that the target lighting position and the lighting area can be changed by manual operation in conformance with the lighting mode.
  • the present embodiment is analogous to the first embodiment in terms of the other structure, and component parts that are identical with their counterparts of the first embodiment are assigned the same reference numerals.
  • the lighting device 3 has a lens manual operation unit 210 connected to the driving gear 42 and a mounting member manual operation unit 220 connected to the mounting member driving gear 53.
  • the lens manual operation unit 210 is connected to a shaft center of the driving gear 42 and has a lens knob operation unit 210a that is an operation unit for manually rotating the driving gear 42.
  • the lens knob operation unit 210a projects from the bezel 60 and rotates the driving gear 42 when manually turned, thereby vertically moving the condensing lens 23.
  • the mounting member manual operation unit 220 is connected to a shaft center of the mounting member driving gear 53 and has the mounting member knob operation unit 210a that is an operation unit for manually rotating the mounting member driving gear 53.
  • the mounting member knob operation unit 210a projects from the bezel 60 and rotates the mounting member driving gear 53 when manually turned, thereby moving the mounting member 31 back and forth.
  • the lighting device 3 of the second embodiment of the present invention has the lens moving mechanism 40 that changes the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 by movement of the condensing lens 23 in the same fashion as does the lighting device 1 of the first embodiment. Accordingly, one lighting device 1 can change the target lighting position and the lighting area. As a consequence, the number of lighting devices to be mounted can be reduced.
  • the lens moving mechanism 40 has the lens gear 41 that is a gear provided on the side 23c of the condensing lens 23 and the driving gear 42 rotating while being meshed with the lens gear 41 under a state that a relative position between the LED 21 and a center axis of the driving gear 42 is remained constant, so as to move the condensing lens 23. Therefore, like the lighting device 1 of the first embodiment, the lighting device 3 of the second embodiment of the present invention can change the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 by means of a simple configuration using gears.
  • the lighting device 3 of the second embodiment of the present invention additionally has the mounting member 31 to which the LED 21 and the lens moving mechanism 40 are to be mounted and the mounting member moving mechanism 50 that moves the mounting member 31 in the front-back direction within the plane perpendicular to the moving direction of the condensing lens 23.
  • the target lighting position can be moved in the front-back direction as well as in the vertical direction.
  • the lighting device 3 of the second embodiment of the present invention is not equipped with any drive unit, like a motor, so that the lighting device can be simply configured.
  • the lighting devices 1 , 2, and 3 of the first and second embodiments of the present invention have been described as the vehicle interior lighting devices. However, the lighting devices are not thus restricted. For instance, the lighting devices can also be used for a desktop lighting device.
  • the mounting members 31 can move back and forth.
  • the mounting member is not thus limited.
  • the position of the mounting member 31 can be fixed, and only the condensing lens 23 can be moved.
  • the mounting member 31 can also be moved horizontally within the plane perpendicular to the moving direction of the condensing lens 23.
  • the mounting member 31 can also be moved in the front-back direction and in the horizontal direction within the plane perpendicular to the moving direction of the condensing lens 23.
  • the moving mechanisms are not thus restricted. Specifically, another mechanism can also be used, so long as the mechanism can move the condensing lens 23 and the mounting member 31.
  • the exemplified the lighting devices 1 , 2, and 3 of the first and second embodiments of the present invention are mounted on the ceiling, and the exemplified condensing lens 23 is vertically moved by means of the lens moving mechanism 40.
  • the lighting devices and the condensing lens are not thus restricted.
  • the essential requirement is that the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 can be changed by movement of the condensing lens 23.
  • the lighting device can also be mounted on a side door of a vehicle; light can also be emitted sideways from the LED 21 ; and the condensing lens 23 can also be moved sideways.
  • the exemplified lighting devices 1 , 2, and 3 of the first and second embodiments of the present invention use the LED 21 as the light source, they are not thus restricted.
  • an incandescent bulb can also be used.
  • the present invention it is possible to provide a lighting device that enables a cutback in the number of lighting devices to be mounted.

Abstract

A lighting device (1), comprises a light source (21) including an emitting surface (21a) emitting a light, a condensing lens (23) including an incident surface (23a) on which the light that is emitted from the light source (21) is incident and an emitting surface (23b) emitting a light that is condensed through the condensing lens (23), and a lens moving mechanism (40) moves the condensing lens (23) so as to change a distance between the incident surface (23a) of the condensing lens (23) and the emitting surface (21a) of the light source (21).

Description

DESCRIPTION
LIGHTING DEVICE
Technical Field
The present invention relates to a lighting device in which a light emitted from a light source is incident from an incident surface of a condensing lens and in which a light that is condensed through a condensing lens is emitted from an emitting surface of the condensing lens. Background Art
As a conventional light device, there is provided with a lighting device in which a light emitted from a light source is incident from an incident surface of a condensing lens and in which a light that is condensed through a condensing lens is emitted from an emitting surface of the condensing lens. In such a lighting device, it is possible to generate a predetermined lighting area at a target lighting position by appropriately setting a distance between an emitting surface of the light source and the incident surface of the condensing lens. For instance, in PTL 1 , a vehicle interior lighting lamp that is capable of changing a light distribution characteristic depending on a model of car is proposed.
In the vehicle interior lighting lamp described in PTL 1 , in order to generate a predetermined lighting area according to a distance from the vehicle interior lighting lamp to a target lighting position; for instance, a distance from the vehicle interior lighting lamp to a position of a driver's hand, a spacer is provided between a circuit board mounted with a light source and a condensing lens so that it is possible to control a distance between an emitting surface of the light source and an incident surface of the condensing lens. For this reason, even when the distance between the vehicle interior lighting lamp and the position of the driver's hand varies according to a model of car, the position of the driver's hand is illuminated by light of the predetermined lighting area according to a model of car. Citation List
Patent Literature
[PTL 1] JP-A-2006-147347
Summary of Invention
Technical Problem
However, in the vehicle interior lighting lamp described in PTL 1 , a lighting device having a spacer of different thickness must be provided according to a distance between the vehicle interior lighting lamp and the target lighting position. As a result, there is possibility in that the number of lighting devices to be mounted is increased.
Solution to Problem
The present invention has been made in view of the above circumstances. It is an object to provide a lighting device that is capable of making it possible to reduce the number of lighting devices to be mounted.
In order to achieve the object, a first aspect of this invention is provided with a lighting device comprising a light source including an emitting surface emitting a light, a condensing lens including an incident surface on which the light that is emitted from the light source is incident and an emitting surface emitting a light that is condensed through the condensing lens, and a lens moving mechanism moves the condensing lens so as to change a distance between the incident surface of the condensing lens and the emitting surface of the light source.
In a second aspect of this invention according to the first aspect of the invention, the lens moving mechanism has a lens gear that is provided on a side of the condensing lens, and a driving gear rotating while being meshed with the lens gear under a state that a relative position between a center axis of the driving gear and the light source is remained constant.
In a third aspect of this invention according to the first aspect or the second aspect of the invention, the lens moving mechanism has a lens driving motor for rotating the driving gear, and the lighting device has a motor control unit for controlling driving of the lens drive motor.
In a fourth aspect of this invention according to any one of the first aspect to the third aspect of the invention, the lighting device comprises a mounting member to which the light source and the lens moving mechanism are to be mounted, and a mounting member moving mechanism that moves the mounting member in a plane that is perpendicular to a moving direction of the condensing lens.
Advantages Effects of Invention
According to the first aspect of the invention, the lighting device has the lens moving mechanism moving the condensing lens so as to change a distance between the incident surface of the condensing lens and the emitting surface of the light source. Therefore, a target lighting position and a lighting area can be adjusted by one lighting device. As a result, the number of lighting devices to be mounted can be reduced.
According to the second aspect of the invention, the lens moving mechanism has a lens gear that is provided on a side of the condensing lens, and a driving gear rotating while being meshed with the lens gear under a state that a relative position between a center axis of the driving gear and the light source is remained constant. Therefore, the distance between the incident surface of the condensing lens and the emitting surface of the light source can be changed by a simple configuration using the gears.
According to the third aspect of the invention, the lens moving mechanism has a lens driving motor for rotating the driving gear, and the lighting device has a motor control unit for controlling driving of the lens drive motor. Accordingly, the target lighting position and the lighting area can be automatically changed.
According to the fourth aspect of the invention, the lighting device comprises a mounting member to which the light source and the lens moving mechanism are to be mounted, and a mounting member moving mechanism that moves the mounting member in a plane that is perpendicular to a moving direction of the condensing lens. Hence, the target lighting position can be changed in a front-back direction as well as in a horizontal direction.
Brief Description of Drawings
Fig. 1 shows a schematic diagram of a lighting device of a first embodiment of the present invention;
Fig. 2 shows an exploded perspective view of a lighting unit of the lighting device shown in Fig. 1 ;
Fig. 3 shows a diagram for explaining a change in light distribution characteristic that will be induced by occurrence of a change in distance between an emitting surface of an LED and an incident surface of a condensing lens;
Fig. 4 shows a flowchart showing procedures by which a motor control unit controls a lens driving motor and a mounting member driving motor according to a lighting mode;
Fig. 5 shows a schematic diagram of a lighting device of a modification of the first embodiment of the present invention; and Fig. 6 shows a schematic diagram of a lighting device of a second embodiment of the present invention.
Description of the Embodiments
Preferred embodiments of a lighting device of the present invention are hereunder described in detail by reference to the drawings.
(First Embodiment)
Fig. 1 shows a schematic diagram of a lighting device 1 of a first embodiment of the present invention. Fig. 2 shows an exploded perspective view of a lighting unit 10 of the lighting device 1 shown in Fig. 1. Fig. 3 shows a diagram for explaining a change in light distribution characteristic that will be induced by occurrence of a change in distance between an incident surface
23a of a condensing lens 23 and a light source 21.
For sake of simplicity, directions of arrows that intersect at right angels in the drawings are taken as a vertical direction, a front-back direction, and a horizontal direction, respectively.
The lighting device 1 of the first embodiment of the present invention is; for instance, a so-called vehicle interior lighting device to be mounted on an indoor ceiling of a vehicle. The vehicle interior lighting device is configured such that a light emitted from an emitting surface 21a of an LED (Light Emitting Diode) 21 that is served as a light source is incident from the incident surface 23a of the condensing lens 23 and a light that is condensed through the condensing lens 23 is emitted from an emitting surface 23b of the condensing lens 23.
As shown in Fig. 1 , the lighting device 1 comprises the lighting unit 10, a motor control unit 70, and an operation input unit 80.
First, the lighting unit 10 is described.
The lighting unit 10 comprises a lighting function unit 20, a moving mechanism 30, and a bezel 60.
The lighting function unit 20 includes the LED 21 that is served as the light source, a circuit board 22 mounted with the LED 21 , and the condensing lens 23 for condensing light that is emitted from the LED 21.
The circuit board 22 is configured from a so-called printed wiring board, and a conductor pattern, like a power circuit for feeding electric power to the LED 21 , is formed on the circuit board 22. The circuit board 22 is connected to a signal line or an electrical wire, like a feeder line, via an un-illustrated terminal formed on the board.
In the LED 21 , the light emitting surface 21a is provided on a surface of a box-shaped package, and an un-illustrated power input terminal is connected to an un-illustrated power circuit of the circuit board 22. The LED 21 is lighted up upon being supplied with electric power via the power circuit.
The condensing lens 23 is a hemispherical lens made from polycarbonate, or the like. When the light is incident from the incident surface 23a, the condensed light is emitted from the hemispherical emitting surface 23b.
By reference to Fig. 3, explanations are now given to a change in light distribution characteristic resulting from occurrence of a change in distance between the emitting surface 21a of the LED 21 and the incident surface 23a of the condensing lens 23.
In Fig. 3, traveling directions of light is expressed by symbols L1 and L2, when the incident surface 23a of the condensing lens 23 is situated at positions P1 and P2, respectively.
Light that is emitted from the emitting surface 21a of the LED 21 is incident from the incident surface 23a of the condensing lens 23. The incident light is inflected according to Snell's theorem until the light is emitted from the emitting surface 23b of the condensing lens 23.
For this reason, when the condensing lens 23 is moved away from the
LED 21 ; more specifically, when the condensing lens 23 is moved downward so that the incident surface 23a of the condensing lens 23 is moved from the position P1 to the position P2, a lighting area of the light emitted from the emitting surface 21a of the LED 21 at a target lighting position P is changed from a lighting area Ar1 to another lighting area Ar2. Specifically, when the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 becomes greater, a change occurs in the predetermined target lighting position P such that the lighting area becomes narrower. The moving mechanism 30 is now described.
As shown in Fig. 1 or Fig. 2, the moving mechanism 30 comprises a mounting member 31 , a lens moving mechanism 40, and a mounting member moving mechanism 50.
The mounting member 31 is a table on which the circuit board 22 to be mounted with the LED 21 and the lens moving mechanism 40 are provided. Specifically, the mounting member 31 is a table on which the LED 21 served as the light source and the lens driving mechanism are to be mounted.
The mounting member 31 is made of a plate-like member having a substantially C-shaped form when viewed from above. A driving motor to be described later is attached to one end 31a of the mounting member 31 , and a mounting member gear 51 that is a rack is attached to anther end 31 b of the mounting member 31. An arm 31c is provided between the one end 31a and the other end 31b.
The lens moving mechanism 40 moves the condensing lens 23 so as to changes a distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21.
The lens moving mechanism 40 comprises a lens gear 41 that is a gear provided on a side 23c of the condensing lens 23, an driving gear 42 that is rotated while being engaged with the lens gear 41 under a state that a relative position between a center axis of the driving gear 42 and the LED 21 is remained constant, thereby moving the condensing lens 23, and a lens driving motor 43 that rotates the driving gear 42.
The lens gear 41 is a rack for linear movements.
The driving gear 42 is connected to a motor shaft of the lens driving motor 43 and vertically moves the condensing lens 23 by the lens gear 41 when the driving gear 42 is rotated by the lens driving motor 43.
When the condensing lens 23 is moved upward by the lens moving mechanism 40, the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 becomes shorter as shown in Fig. 3, the lighting area of the light emitted from the emitting surface 23b of the condensing lens 23 becomes broadened.
In the meantime, when the condensing lens 23 is moved downward, the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 becomes greater, so that the lighting area of the light emitted from the emitting surface 23b of the condensing lens 23 becomes narrower.
The mounting member moving mechanism 50 moves the mounting member 31 within a plane that is perpendicular to a moving direction of the condensing lens 23. In the first embodiment, the mounting member moving mechanism 50 moves the mounting member 31 in a front-back direction that is perpendicular to the vertical direction that is the moving direction of the condensing lens 23.
The mounting member moving mechanism 50 is a rack mounted on the mounting member 31. The mounting member moving mechanism 50 comprises the mounting member gear 51 , a transmission gear 52 to mesh with the mounting member gear 51 , a mounting member driving gear 53 that rotates the mounting member gear 51 when the mounting member driving gear 53 is meshed with the transmission gear 52, and a mounting member driving motor 54 for rotating the mounting member driving gear 53.
When the mounting member moving mechanism 50 is actuated by the mounting member moving motor 54, the mounting member driving gear 53 is rotated, whereupon the mounting member 31 is moved in a front-back direction by the transmission gear 52. The mounting member 31 , the lens moving mechanism 40, and the mounting member moving mechanism 50 are assembled into a frame 90 formed so as to retain them at respective predetermined fixed positions or within respective moving ranges. The mounting member 31 , the lens moving mechanism 40, and the mounting member moving mechanism 50 are retained and fixed within the bezel 60 by the frame 90.
The bezel 60 retains therein the lighting function unit 20 and the moving mechanism 30 and is mounted to an indoor ceiling of a vehicle. The bezel 60 has a window 61 that is formed in an indoor surface 60a and is made of an optically transparent member. The light emitted from the condensing lens 23 pass toward an interior through the windows 61.
The motor control unit 70 is now described.
The motor control unit 70 is embodied from a CPU or the like. The motor control unit 70 is electrically connected to the lens driving motor 43, the mounting member driving motor 54, and the operation input unit 80. On the basis of a signal output from the operation input unit 80, the motor control unit 70 controls driving of the lens driving motor 43 and the mounting member driving motor 54.
The operation input unit 80 is now described.
The operation input unit 80 is embodied from a switch mechanism that enables pressing operation and outputs lighting mode selection information to the motor control unit 70.
The lighting mode includes; for instance, a handy lighting mode for lighting driver's hands, a handy spot lighting mode for lighting the hands in a lighting area that is narrower than a lighting area achieved in the hand lighting mode, and a foot lighting mode for lighting a driver's foot.
More specifically, the hand lighting mode and the hand spot lighting mode are lighting modes for controlling a width of the lighting area achieved at the driver's hand that is the target lighting position. The condensing lens 23 is moved further downward in the hand spot lighting mode than in the hand lighting mode. The lighting device 1 thereby lights the driver's hand with light in an area that is narrower than the lighting area achieved in the hand lighting mode.
In the foot lighting mode, the target lighting position is a driver's foot. In the foot lighting mode, the mounting member 31 is moved in a front-back direction to a position where the foot is easily lighted, and the condensing lens 23 is moved further downward than in the hand lighting mode. As a result, the lighting device 1 lights the driver's foot in the hand lighting mode within the area equal to the lighting area.
According to the lighting mode selected by input operation performed by the operation input unit 80, the lighting device 1 automatically controls driving of the lens driving motor 43 and the mounting member driving motor 54, whereby the target lighting position and the lighting area are automatically controlled according to the lighting mode.
By reference to Fig. 4, there are explained procedures pertaining to control of the lens driving motor 43 and the mounting member driving motor 54 that complies with the lighting mode and that the motor control unit 70 performs. Fig. 4 is a flowchart showing procedures by which the motor control unit 70 controls the lens driving motor 43 and the mounting member driving motor 54 according to the lighting mode.
For instance, when a power supply to the lighting device 1 is triggered by driver's key operation, or the like, the motor control unit 70 determines whether or not lighting mode selection information has been output from the operation input unit 80 (step S101). When the lighting mode selection information has been output from the operation input unit 80 (Yes in step S101), the motor control unit 70 generates a drive control signal conforming to a selected lighting mode for the lens driving motor 43 and the mounting member driving motor 54 (step S102).
Subsequently, the motor control unit 70 outputs the generated drive control signal to the lens driving motor 43 and the mounting member driving motor 54 (step S103). The lens driving motor 43 and the. mounting member driving motor 54 are thereby actuated in conformance with the selected lighting mode, whereupon the condensing lens 23 is vertically moved and whereupon the mounting member 31 is moved front and back.
Subsequently, a processing is transferred to step S101 by the motor control unit 70 so that the above-mentioned processing is repeated.
In the meantime, when the lighting mode selection information is not output from the operation input unit 80 in step S101 (No in step S101), the motor control unit 70 repeats determination processing pertaining to step S101.
The lighting device 1 of the embodiment of the present invention has the lens moving mechanism 40 that changes the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 by moving the condensing lens 23. Accordingly, by only one lighting device 1 , it is possible to change the target lighting position and the lighting area. As a result, the number of lighting devices to be mounted can be reduced. The lens moving mechanism 40 comprises the lens gear 41 that is a gear provided on the side 23c of the condensing lens 23 and the driving gear 42 rotating while meshing with the lens gear 41 under a state under a state that a relative position between a center axis of the driving gear 42 and the LED 21 is remained constant. Accordingly, the lighting device 1 of the embodiment of the present invention can change the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 by a simple configuration using the gears.
The lens moving mechanism 40 comprises a lens driving motor 43 for rotating the driving gear 42, and the lighting device 1 has a motor control unit for controlling driving of the lens drive motor 43. Accordingly, the target lighting position and the lighting area can be automatically changed.
The lighting device 1 of the embodiment of the present invention additionally has the mounting member 31 to which the LED 21 and the lens moving mechanism 40 are to be mounted d and the mounting member moving mechanism 50 that moves the mounting member 31 in a front-back direction within the direction that is perpendicular to the moving direction of the condensing lens 23. Accordingly, the target lighting position can be changed in the front-back direction as well as in the vertical direction.
(First Modification)
A lighting device 2 of a modification of the first embodiment of the present invention is now described by reference to Fig. 5. Fig. 5 is a schematic diagram of the lighting device 2 of the modification of the first embodiment of the present invention.
The lighting device 2 of the modification differs from the lighting device 1 of the first embodiment in that the motor control unit 70 is connected to a vehicle information output unit 81 that outputs information about respective units of the vehicle.
The modification is analogous to the embodiment in terms of the other structural configuration. Component parts that are identical with their counterparts in the embodiment are assigned the same reference numerals.
The motor control unit 70 controls the lens driving motor 43 and the mounting member driving motor 54 so as to affect lighting in conformance with vehicle information output from the vehicle information output unit 81.
The vehicle information output from the vehicle information output unit 81 includes; for instance, seat belt-buckle status information showing whether or not a seat belt is buckled. When information showing that the seat belt is unbuckled is output from the vehicle information output unit 81 , the motor control unit 70 controls for instance, the lens driving motor 43 and the mounting member driving motor 54 so as to light a position of a coupling unit of the seat belt with spot light.
The lighting device 2 of the modification can yield the same advantage as that yielded by the lighting device 1 of the first embodiment.
(Second Embodiment)
A lighting device 3 of a second embodiment of the present invention is now described by reference to Fig. 6. Fig. 6 shows a schematic diagram of the lighting device 3 of the second embodiment of the present invention.
The lighting device 3 of the second embodiment of the present invention differs from the lighting device 1 of the first embodiment in that the target lighting position and the lighting area can be changed by manual operation in conformance with the lighting mode.
The present embodiment is analogous to the first embodiment in terms of the other structure, and component parts that are identical with their counterparts of the first embodiment are assigned the same reference numerals.
The lighting device 3 has a lens manual operation unit 210 connected to the driving gear 42 and a mounting member manual operation unit 220 connected to the mounting member driving gear 53.
The lens manual operation unit 210 is connected to a shaft center of the driving gear 42 and has a lens knob operation unit 210a that is an operation unit for manually rotating the driving gear 42. The lens knob operation unit 210a projects from the bezel 60 and rotates the driving gear 42 when manually turned, thereby vertically moving the condensing lens 23.
The mounting member manual operation unit 220 is connected to a shaft center of the mounting member driving gear 53 and has the mounting member knob operation unit 210a that is an operation unit for manually rotating the mounting member driving gear 53. The mounting member knob operation unit 210a projects from the bezel 60 and rotates the mounting member driving gear 53 when manually turned, thereby moving the mounting member 31 back and forth.
The lighting device 3 of the second embodiment of the present invention has the lens moving mechanism 40 that changes the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 by movement of the condensing lens 23 in the same fashion as does the lighting device 1 of the first embodiment. Accordingly, one lighting device 1 can change the target lighting position and the lighting area. As a consequence, the number of lighting devices to be mounted can be reduced. Further, the lens moving mechanism 40 has the lens gear 41 that is a gear provided on the side 23c of the condensing lens 23 and the driving gear 42 rotating while being meshed with the lens gear 41 under a state that a relative position between the LED 21 and a center axis of the driving gear 42 is remained constant, so as to move the condensing lens 23. Therefore, like the lighting device 1 of the first embodiment, the lighting device 3 of the second embodiment of the present invention can change the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 by means of a simple configuration using gears.
Like the lighting device 1 of the first embodiment, the lighting device 3 of the second embodiment of the present invention additionally has the mounting member 31 to which the LED 21 and the lens moving mechanism 40 are to be mounted and the mounting member moving mechanism 50 that moves the mounting member 31 in the front-back direction within the plane perpendicular to the moving direction of the condensing lens 23. Hence, the target lighting position can be moved in the front-back direction as well as in the vertical direction. The lighting device 3 of the second embodiment of the present invention is not equipped with any drive unit, like a motor, so that the lighting device can be simply configured.
The lighting devices 1 , 2, and 3 of the first and second embodiments of the present invention have been described as the vehicle interior lighting devices. However, the lighting devices are not thus restricted. For instance, the lighting devices can also be used for a desktop lighting device.
Further, in the exemplified lighting devices 1 , 2, and 3 of the embodiments of the present invention, the mounting members 31 can move back and forth. However, the mounting member is not thus limited. The position of the mounting member 31 can be fixed, and only the condensing lens 23 can be moved. Alternatively, the mounting member 31 can also be moved horizontally within the plane perpendicular to the moving direction of the condensing lens 23. Further alternatively, the mounting member 31 can also be moved in the front-back direction and in the horizontal direction within the plane perpendicular to the moving direction of the condensing lens 23. In relation to the configuration of the moving mechanisms, like the types and number of gears, used in the lighting devices 1 , 2, and 3 of the embodiments of the present invention, the moving mechanisms are not thus restricted. Specifically, another mechanism can also be used, so long as the mechanism can move the condensing lens 23 and the mounting member 31.
The exemplified the lighting devices 1 , 2, and 3 of the first and second embodiments of the present invention are mounted on the ceiling, and the exemplified condensing lens 23 is vertically moved by means of the lens moving mechanism 40. However, the lighting devices and the condensing lens are not thus restricted. Specifically, the essential requirement is that the distance between the incident surface 23a of the condensing lens 23 and the emitting surface 21a of the LED 21 can be changed by movement of the condensing lens 23. For instance, the lighting device can also be mounted on a side door of a vehicle; light can also be emitted sideways from the LED 21 ; and the condensing lens 23 can also be moved sideways.
Although the exemplified lighting devices 1 , 2, and 3 of the first and second embodiments of the present invention use the LED 21 as the light source, they are not thus restricted. For instance, an incandescent bulb can also be used.
Although the inventions conceived by the inventors have been specifically described on the basis of the embodiments of the inventions, the present inventions are not restricted to the embodiments and are susceptible to various alterations without departing the gist of the invention.
Industrial applicability
According to the present invention, it is possible to provide a lighting device that enables a cutback in the number of lighting devices to be mounted.
The present application is based on Japanese Patent Application No. 2011-181317 filed on August 23, 2011 , the contents of which are incorporated herein for reference.
Reference Signs List
1 , 2, 3 LIGHTING DEVICE
10 LIGHTING UNIT
20 LIGHTING FUNCTION UNIT 21 LED
21a EMITTING SURFACE
22 CIRCUIT BOARD
23 CONDENSING LENS
23a INCIDENT SURFACE
23b EMITTING SURFACE
23c SIDE
30 MOVING MECHANISM
31 MOUNTING MEMBER
31a, 31 b END
31cARM
40 LENS MOVING MECHANISM UNIT
41 LENS MOVING MECHANISM
42 DRIVING GEAR
43 LENS DRIVING MOTOR
50 MOUNTING MEMBER MOVING MECHANISM
51 MOUNTING MEMBER GEAR
52 TRANSMISSION GEAR
53 MOUNTING MEMBER DRIVING GEAR 54 MOUNTING MEMBER DRIVE MOTOR
60 BEZEL
60a INDOOR SURFACE
61 WINDOW
70 MOTOR CONTROL UNIT 80 OPERATION INPUT UNIT
81 VEHICLE INFORMATION OUTPUT UNIT
90 FRAME
210 MANUAL LENS OPERATION UNIT
210a LENS KNOB OPERATION UNIT
220 MANUAL MOUNTING MEMBER OPERATION UNIT AM , Ar2 LIGHTING AREA

Claims

1. A lighting device, comprising:
a light source including an emitting surface emitting a light;
a condensing lens including an incident surface on which the light that is emitted from the light source is incident and an emitting surface emitting a light that is condensed through the condensing lens; and
a lens moving mechanism moves the condensing lens so as to change a distance between the incident surface of the condensing lens and the emitting surface of the light source.
2. The lighting device according to claim 1 , wherein the lens moving mechanism has a lens gear that is provided on a side of the condensing lens, and a driving gear rotating while being meshed with the lens gear under a state that a relative position between a center axis of the driving gear and the light source is remained constant.
3. The lighting device according to claim 2, wherein the lens moving mechanism has a lens driving motor for rotating the driving gear, and the lighting device has a motor control unit for controlling driving of the lens drive motor.
4. The lighting device according to any one of claims 1 to 3, further comprising: a mounting member to which the light source and the lens moving mechanism are to be mounted; and
a mounting member moving mechanism that moves the mounting member within a plane that is perpendicular to a moving direction of the condensing lens.
PCT/JP2012/071740 2011-08-23 2012-08-22 Lighting device WO2013027852A1 (en)

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