JP5372614B2 - Interior lighting device - Google Patents

Description

  The present invention relates to an apparatus for illuminating the interior of a vehicle, and more particularly to an interior lighting apparatus in which a part of the apparatus is configured as a portable illumination device for convenience of the device.

  An interior lighting device for illuminating the interior of a vehicle is usually fixedly disposed on the inner ceiling of the interior of the vehicle. In recent years, in order to enhance the convenience of the indoor lighting device, a lighting device has been divided into a configuration, and the divided portion can be removed and used, for example, as a portable lighting device. For example, in Patent Document 1, a unit main body fixed in a vehicle interior and a sub-unit that can be attached to and detached from the unit main body constitute an indoor lighting device, and a so-called portable lighting device that is independent even if the sub-unit is removed, so-called What has been made available as a flashlight has been proposed.

JP-A-10-181445

  This interior lighting device illuminates the vehicle interior with light from the light irradiation surface provided on the subunit, and at the same time performs illumination on the same light irradiation surface when the subunit is removed. Increasing the light irradiation surface is effective for brightly illuminating the interior of the vehicle, but the subunit becomes larger and the portability becomes worse. Conversely, if the light irradiation surface is made smaller, the portability is improved, but it is difficult to illuminate the interior of the vehicle with the necessary brightness. In addition, since the light irradiation surface of the subunit is configured to irradiate diffused light so as to perform illumination suitable for indoor lighting, when the light is irradiated from the unit body and used as a flashlight, There is also a problem that it is difficult to illuminate an object brightly because of its low light collecting property.

  Further, as in Patent Document 1, an indoor lighting device is disposed on the inner ceiling of the vehicle interior so that the unit main body has a flat shape along the inner ceiling, and the sub-unit is also formed in a thin shape corresponding thereto. In this case, if the subunit is designed to illuminate downward in the passenger compartment when the subunit is mounted on the unit body, the light irradiation surface is arranged on one side in the longitudinal direction of the subunit. Become. For this reason, when the light irradiation surface of the subunit is increased, the width of the subunit is also increased, the retention property when the subunit is carried is lowered, and light is emitted in a direction perpendicular to the longitudinal direction of the subunit when it is lit. There is a problem in that it is irradiated and the usability of the subunits is deteriorated.

  An object of the present invention is to provide an indoor lighting device that realizes suitable indoor lighting and improves the retainability and usability of the removed portable lighting device.

The indoor lighting device of the present invention includes a base unit that is disposed indoors and emits illumination light toward the room, and a portable unit that is detachably supported by the base unit and includes a light source unit that emits light. The base unit includes a light guide, and the portable unit is mounted along the surface of the base unit and emits light in a direction along the surface. Is characterized in that the light emitted from the portable unit is incident and guided to emit illumination light in a direction substantially perpendicular to the surface of the base unit .

In this invention, it is preferable to set it as the following form.
(A) It is preferable that the portable unit emits condensed light and the light guide emits diffused light.
(B) The portable unit includes a built-in battery that can be charged.
(C) The portable unit has a lighting switch, and is supported in a state where the lighting switch is oriented in the same direction as the surface when mounted on the surface of the base unit.

  According to the indoor lighting device of the present invention, the light emitted from the portable unit as the portable lighting device attached to the base unit is incident on the base unit, and is emitted as illumination light toward the room in any desired form in the base unit. And perform lighting. Therefore, it is possible to configure a portable unit that is easy to use as a flashlight without being restricted by the configuration of the portable unit, in particular, the direction of light emitted from the portable unit and the light collecting property, while the base unit. From this, it is possible to realize suitable illumination with high illumination effect by enabling illumination by diffused light.

Further, according to the indoor lighting device of the present invention, it is possible to emit light from the base unit in a direction and state suitable for indoor lighting even when the portable unit is mounted on the base unit in an arbitrary posture. Further, by providing the base unit with the light guide, illumination light can be emitted over the region where the light guide is disposed. Furthermore, it is possible to emit light having a preferable light collecting property by using the portable unit as a flashlight, and the base unit can illuminate a wide area in the room by the diffused light from the light guide. In addition, even when the longitudinal direction of the portable unit is mounted along the surface of the base unit, light can be emitted toward the longitudinal direction of the portable unit, further enhancing the usability as a flashlight, and from the base unit. Can efficiently illuminate the interior of the room with light emitted in a direction substantially perpendicular to the surface.

The top view which looked up the indoor lighting apparatus of Embodiment 1 from the downward direction. FIG. 3 is an external perspective view of the indoor lighting device according to the first embodiment. FIG. 3 is a perspective view of a light guide of the indoor lighting device according to the first embodiment. The perspective view of a part of base body of the indoor illuminating device of Embodiment 1, and a portable unit The typical block diagram explaining the light emission direction of a portable unit and a light guide. FIG. 6 is an external perspective view of a main part of the portable unit according to the second embodiment. The top view and the BB line expanded sectional view which looked up the indoor lighting apparatus of Embodiment 3 from the downward direction. The conceptual top view which looked up the indoor lighting apparatus of the different form of Embodiment 4 from the downward direction.

(Embodiment 1)
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of an interior lighting device according to a first embodiment in which the present invention is disposed on the inner ceiling of a vehicle interior of a car, as viewed from below. FIG. 2 is an external perspective view thereof. The base unit 1 has a shallow dish shape that is almost rectangular in shape and is fixed to the inner ceiling of the passenger compartment that is not shown in the figure. It is comprised with the portable unit 2 which can be used as an electric lamp.

  The base unit 1 has a base body 11 in the shape of a flat shallow dish having a rectangular shape with rounded corners, and the base body 11 is directed to the inner ceiling of the vehicle interior with the longitudinal direction of the base body 11 directed in the longitudinal direction of the automobile. It is fixed. A concave groove 12 for supporting the portable unit 2 is formed along the longitudinal direction at a substantially central portion in the short side direction of the lower surface of the base body 11. In addition, a pair of reading lamps 3 on the driver's seat side and the passenger seat side are disposed on both sides of the concave groove portion 12 on the lower surface of the base body 11.

  These reading lamps 3 on the driver's seat side and the passenger's seat side have the same configuration and use an existing reading lamp, so that detailed explanation is omitted here, but the rectangular opening opened in the base body 11 is omitted. A rectangular panel 31 inserted into the window is used as a base, and an LED (light emitting diode) or miniature bulb is used as a light source, and a lamp 32 that performs spot illumination with a condenser lens, and the lamp 32 is manually operated to turn on the lamp 32. A turn-on switch 33a and a turn-off switch 33b that are turned off are provided. The lighting switch 33a and the extinguishing switch 33b may be constituted by one push type switch or a lever type switch so as to switch on / off of the lamp 32.

  The base unit 11 extends endlessly along the peripheral edge of the base body 11 so as to surround the pair of reading lamps 3 or the recessed groove portion 12, and here is extended in a rectangular frame shape, and is fixedly supported by the base body 11. The light guide 13 is provided. FIG. 3 is a perspective view of the light guide 13. The light guide 13 is formed of a transparent resin that transmits light therein, and a cross-sectional shape perpendicular to the extending direction along the rectangular frame shape is rectangular. In addition, a light guide part 131 projecting inward is formed in a part of the extending direction, here a part of the short side of the rectangular frame shape, and is disposed so as to face one end part of the concave groove part 12. . The light guide 131 is configured as a flat light incident surface facing the concave groove 12 and guides light emitted from the portable unit 2 into the light guide 13 as will be described later. Further, the light guide 13 is formed with a tapered recess 132 on the outer surface of the light guide 131 for internally reflecting the light incident from the light guide 13 toward both sides. Further, diffusion steps 133 are formed at a plurality of locations in the extending direction of the upper side surface of the light guide 13, and light guided through the light guide 13 is diffused in the diffusion step 133 as will be described later. The light is reflected and emitted from the lower surface of the light guide 13 toward the vehicle interior. Here, the diffusion step 133 is configured as a diffusion slit made of a wedge-shaped concave groove having a linear shape orthogonal to the longitudinal direction of the light guide 13. However, the concave groove having a dot shape or an arbitrary shape is used. It may be formed as. The number of the diffusion steps 133 increases as the optical path length from the light guide unit 131 becomes longer. Even if the light guided through the light guide 13 is gradually attenuated, the diffusion step 133 increases the light emitted from the light guide 13. The amount is arranged and formed so as to be uniform over the extending direction of the light guide 13.

  FIG. 4 shows a part of the concave groove portion 12 of the base body 11, and the concave groove portion 12 has a pair of power supply terminals 14 on the other end surface opposite to the light guide portion 131 of the light guide body 13. Is arranged. The power supply terminal 14 is composed of a conductive member urged by a spring means not shown in the drawing so that the tip protrudes inward of the concave groove portion 12 by a predetermined length. Is electrically connected to the in-vehicle battery. Further, a pair of engaging pieces 15 formed of elastic metal pieces are fixed to each surface facing the groove width direction on one end side of the concave groove portion 12 of the base body 11, and a portable unit as will be described later. 2 is elastically engaged with the engagement recess 27 provided in the second position.

As can be seen from FIG. 4, the portable unit 2 has a long and slender stick-shaped casing 21 that can be inserted into the groove 12 of the base body 11. A light source unit 22 is disposed at one end of the casing 21 so that light is emitted along the length direction of the casing 21 when the casing 21 is lit. The housing 21 includes a rechargeable battery, that is, a built-in battery 23 made of a secondary battery, and a lighting circuit 24 for controlling the lighting state of the light source unit 22 that is lighted by the built-in battery 23. . A pair of power receiving terminals 25 electrically connected to the built-in battery 23 is disposed on the other end surface of the housing 21. The built-in battery 23 is supplied with power through the power receiving terminals 25 and is charged by the power of the in-vehicle battery. It has come to be. The power receiving terminal 25 is somewhat recessed with respect to the other end surface of the housing 21, and the power supply terminal 14 provided on the base body 11 is temporarily buried when the portable unit 2 is inserted into the concave groove portion 12. Then, the power feeding terminal 14 and the power receiving terminal 25 are electrically connected while projecting and fitting with the elastic force toward the power receiving terminal 25. A latching groove for hooking a fingertip when the portable unit 2 is removed from the base unit 1 on a lower side of the casing 21 of the portable unit 2, that is, a surface directed downward when the portable unit 2 is attached to the base unit 1. 26 is formed. Further, a pair of engaging recesses 27 that are shallowly recessed are provided on both side surfaces of the housing 21, and the pair of engaging pieces 15 face each other when inserted into the groove 12. The engagement recess 27 is elastically engaged. Therefore, the variable unit 2 can be held in the groove 12 by the elastic clamping force by the engagement piece 15 and the fitting between the power supply terminal 14 and the power reception terminal 25.

The light source unit 22 of the portable unit 2 includes a white LED (light emitting diode) 221 that emits one or a plurality of white lights, and a translucent cover 222 that covers the LED 221. It is configured as a rectangular condenser lens 223. The LED 221 emits light by the power of the built-in battery 23, and the light emitted from the emitted LED 221 is condensed by the condenser lens 223 and emitted as spot light . On the lower surface of the casing 21 of the portable unit 2, a lighting switch 28a and a lighting switch 28b for switching the light source section 22 on and off are arranged side by side in the width direction. The lighting circuit 24 built in the unit 2 is controlled, and the light emission state of the LED 221 is switched. The casing 21 is provided with an automatic / manual switch 29 for switching the lighting state automatically or manually. As will be described later, the automatic / manual changeover switch 29 forcibly switches the light source unit 22 when the portable unit 2 is removed from the base unit 1 regardless of the state of the turn-on switch 28a and the turn-off switch 28b. Lights up.

  In the indoor lighting device of the first embodiment, the portable unit 2 is attached to the base unit 1 in a normal state. That is, as shown in FIG. 1, the portable unit 2 is in a state of being inserted into the groove 12 of the base body 11 of the base unit 1. In this state, in the portable unit 2, as shown in FIG. 4, the engaging recess 27 provided in the housing 21 engages with the engaging piece 15 of the base unit 1, and at the same time the power feeding terminal 14 becomes the power receiving terminal 25. Since they are fitted, they are held in the concave groove portion 12 without being dropped by the support in these. At this time, the power receiving terminal 25 of the portable unit 2 is electrically connected to the power supply terminal 14 of the base unit 1, and the built-in battery 23 is in a charged state by receiving power from the in-vehicle battery.

Then, as schematically shown in FIG. 5, when the lighting switch 28 a is turned on, the LED 221 emits light by receiving power from the built-in battery 23 or power from the vehicle battery under the control of the lighting circuit 24, and the condenser lens 223. The spot light condensed by the light is emitted from the light source unit 22 of the portable unit 2 in the lens optical axis direction A1 of the condenser lens 223, that is, in the direction along the longitudinal direction of the portable unit. This direction is a direction along the ceiling surface of the inner ceiling of the vehicle interior in which the interior lighting device is disposed, and light is emitted in a direction toward the rear of the automobile. The emitted light is incident on the light guide body 13 from the incident surface of the light guide portion 131 of the light guide body 13 disposed so as to face the light guide body 13. As shown in FIG. 1, the incident light is internally reflected by the tapered recess 132 and divided into left and right, and thereafter, the inner light of the light guide 13 is repeatedly reflected on the upper and lower surfaces and the left and right surfaces of the light guide 13. Light is guided from the left and right sides to the other end on the opposite side. Then, referring to FIG. 5 again, the light is reflected in the diffusion state in the diffusion step 133 provided in the light guide 13 in the middle of the light guide, and the reflected light enters the vehicle interior below the lower surface of the light guide 13. It is emitted in the directed direction A2, and irradiates the passenger compartment. Thereby, the interior lighting device is in a state where the light guide 13 at the peripheral edge of the base unit 1 emits light, and the interior of the vehicle is illuminated by the light emitted from the light guide 13. In this illumination, light is emitted from the entire region of the light guide 13 in the extending direction, and the emitted light is emitted as diffused light, so that it is possible to illuminate a wide range in the vehicle interior. It goes without saying that the operation of the turn-off switch 28b stops the light emission of the LED 221 and the light source unit 22 is turned off to stop the illumination.

  In the reading lamps 3 on both sides, the lamps 32 are turned on by turning on the respective lighting switches 33a. It goes without saying that spot light is emitted downward from the lit lamp 32 and illuminates the driver's seat and passenger's hand in the passenger seat.

When an automobile occupant hooks a fingertip on the retaining groove 26 of the portable unit 2 and pulls it downward, the engagement state between the engagement piece 15 and the engagement recess 27 is released, and the portable unit 2 is removed from the base unit 1. be able to. At this time, when the automatic / manual changeover switch 29 is switched to automatic, the light source unit 22 is turned on simultaneously with the removal of the portable unit 2 under the control of the lighting circuit 24. This is because the lighting circuit 24 includes means for detecting a state in which the electrical connection between the power supply terminal 14 and the power receiving terminal 25 is interrupted, and the LED 221 is configured to emit light when this detection is performed. . On the other hand, when the automatic / manual switch 29 is switched to manual, the light source unit 22 does not light even if the portable unit 2 is removed. At this time, the lighting switch 28a is turned on to turn on the light. In any of these cases, the light source unit 22 is turned on using the built-in battery 23 built in the portable unit 2 as a power source, so that the lighting is continued as long as the built-in battery 23 is charged. When the light source unit 22 is turned on, the light emitted from the LED 221 is emitted in the lens optical axis direction A1 through the condenser lens 223 and is emitted from one end of the casing 21 of the portable unit 2 in the longitudinal direction of the casing. Therefore, when the casing 21 of the portable unit 2 is held in a hand-held state, it can be used as a lamp that emits light in the direction of the thumb and illuminates the front as in the case of a normal flashlight. It will be a thing. Further, since the emitted light is condensed by the condenser lens 223 and emitted in the form of spot light, the object can be illuminated brighter than in the case of diffused light, and the functionality as a flashlight Is secured.

  When the illumination by the portable unit 2 becomes unnecessary, the light source unit 22 can be turned off by operating the turn-off switch 28b. Thereby, the power consumption of the internal battery 23 when the portable unit 2 is detached from the base unit 1 is suppressed. When the portable unit 2 is pushed into the recessed groove portion 12, the portable unit 2 is brought into the base unit 1 by fitting between the power feeding terminal 14 and the power receiving terminal 25 and engaging the engagement side 5 and the engagement concave portion 27. It can be installed and returned to its original state. At this time, when the automatic / manual changeover switch 29 is switched to automatic, when the portable unit 2 is inserted into the concave groove portion 12 of the base unit 1, the power supply terminal 14 and the power reception terminal 25 are again fitted and electrically connected. Therefore, the light source unit 22 is automatically turned off by the control of the lighting circuit 24 even if the turn-off switch 28b is not operated.

  Here, the portable unit 2 may be provided with a charge indicator lamp that indicates the state of charge of the built-in battery 23. For example, although illustration is omitted, when a small LED is provided in a part of the casing 21 of the portable unit 2 and the built-in battery 23 is lit when it is in a predetermined charging state, and charging is required Turn off the light. In particular, when the portable unit 2 is detached from the base unit 1 and used as a flashlight, the charge unit confirms the state of charge with the charge indicator lamp, so that the portable unit 1 is suddenly turned off due to insufficient charging of the built-in battery 23. It becomes possible to prevent the illumination from being impossible.

  Thus, in the interior lighting device of Embodiment 1, the light guide 13 that irradiates the light emitted from the portable unit 2 toward the vehicle interior is the direction A1 in which the light incident surface is along the inner ceiling surface, The light exit surface is a direction A2 perpendicular to the inner ceiling surface. As a result, the incident direction A1 and the exit direction A2 are substantially orthogonal to each other. Therefore, when the portable unit 2 is mounted on the base unit 1 so that the longitudinal direction of the casing 21 is along the inner ceiling surface, the light emitted from the light source unit 22 of the portable unit 2 is transferred to the portable unit 2. A configuration of emitting light in the longitudinal direction of the two casings 21 can be employed. Moreover, since the light guide 13 emits the incident spot light as diffused light, the portable unit 2 can be configured to emit the spot light. Therefore, while the interior lighting device can illuminate the vehicle interior over a wide range by irradiating diffuse light with the light guide 13, the portable unit 2 can be configured in the same form as a normal flashlight. Usability of the transport unit 2 can be improved.

(Embodiment 2)
FIG. 6 is a conceptual configuration diagram of the portable unit 2A of the second embodiment. Since the overall shape and configuration of the portable unit 2A are the same as those of the first embodiment, a configuration different from that of the first embodiment will be described. In the portable unit 2A according to the second embodiment, the light source unit 22 includes three LEDs 221r, 221g, and 221b that emit different color lights of R (red), G (green), and B (blue). Further, the three LEDs 221r, 221g, and 221b are selectively made to emit light by the dial switch 20 provided in the casing 21 of the portable unit 2 (switching positions of “R”, “G”, and “B” in the figure). Alternatively, it is configured such that three can emit light at the same time (switching position of “W” in the figure), and three can automatically emit light in order (switching position of “A” in the figure). . In this way, if the lighting switch 28a is turned on when the portable unit 2A is mounted on the base unit 1, the LED to emit light is selected and any one of red, green, and blue light is emitted. Alternatively, the light of the three LEDs is mixed to emit white color light, and the LEDs are sequentially emitted to change the color of the emitted light over time. Thereby, the color light incident on the light guide 13 of the base unit 1 is changed, and the color light emitted from the light guide 13 and illuminating the interior of the vehicle is changed to enhance the illumination effect. Further, when the portable unit 2 is detached from the base unit 1, it can be used as a flashlight that emits light of any color.

(Embodiment 3)
FIG. 7A shows a conceptual plan view of the third embodiment. Components equivalent to those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. In the third embodiment, the light guide 13 </ b> A is formed in a fan shape in a planar shape and disposed on a part of the surface of the base unit 1. FIG. 7B is an enlarged cross-sectional view taken along the line BB in FIG. 7A for explaining the configuration of the light guide 13A. The light is emitted from the portable unit 2 and incident on the light guide 13A. A concave reflecting mirror 134 that reflects light downward, and a plate-like diffusing lens 135 that has a diffusing step 136 that is disposed immediately below the concave reflecting mirror 134 and has a surface close to a hemispherical surface. Yes. In general, the light guide has a structure in which light is allowed to travel while being internally reflected inside the transparent body. In this sense, the light guide 13A of the third embodiment is exactly the light guide. However, the light guide according to the present invention is referred to as a light guide as including an optical member that causes light to travel inside as in the third embodiment.

As representatively shown by a part of the light rays in the figure, when the light emitted from the light source unit 22 of the portable unit 2 enters the light guide 13A, it travels through the light guide 13A, and the concave reflecting mirror. Reflected downward at 134. At this time, if the horizontal sectional shape of the incident surface 137 of the light guide 13A is formed in a concave lens shape, the incident light can be projected toward almost the entire surface of the concave reflecting mirror 134 while diffusing in a fan shape. The reflected light is transmitted through the diffusion lens 135 while being diffused in the diffusion step 136, and is emitted toward the vehicle interior. Thereby, the light emitted from the portable unit 2 along the surface of the base unit 1, that is, the surface of the inner ceiling of the vehicle interior, is emitted in a direction substantially perpendicular to the surface of the base unit 1 by the light guide 13A. Will be. Therefore, as in the first embodiment, it is possible to improve the usability of the portable unit 2 as a flashlight, while it is possible to effectively illuminate the vehicle interior with the diffused light emitted from the light guide 13A. become.

(Embodiment 4)
FIG. 8 is a schematic plan view of the fourth embodiment as a modification of the first embodiment. In FIG. 8A, a tapered reflector 137 is provided instead of the tapered recess 132 formed to face the light guide part 131 of the light guide 13, and light emitted from the light source part 22 of the portable unit 2 is disposed. The light is reflected left and right by the tapered reflector 137 and is incident on the light guide 13. By doing in this way, the light guide part 131 of the light guide 13 may be a shape obtained by cutting out a part in the circumferential direction of the light guide 13 having a rectangular frame shape, and it is necessary to integrally form the tapered recess 132. Thus, the mold structure when the light guide 13 is formed of a transparent resin can be simplified, and the light guide 13 can be easily manufactured. Further, the tapered reflector 137 has a higher reflection efficiency than the tapered recess, and can increase the efficiency of light guided to the light guide 13, and thus can increase the emission efficiency of diffused light and enhance the lighting effect in the vehicle interior.

  In FIG. 8B, a light guide 131 and a tapered recess 132 are formed on both sides of the light guide 13 in the longitudinal direction, and filters 138 a and 138 b of different colors are arranged on the incident surface of each light guide 131. ing. In addition, the portable unit 2 is configured so that it can be attached to the base unit while being inverted in the longitudinal direction. As the different color filters 138a and 138b, for example, an arbitrary color filter such as a red filter or a green filter can be selected or replaced with another color. By doing so, as indicated by an arrow in the figure, the light emitted from the light source unit 22 of the portable unit 2 is reversed by reversing the longitudinal direction of the portable unit 2 when mounted on the base unit 1. The light is transmitted through the different color filters 138 a or 138 b and colored, and is incident as different color light from different light guides 131 and guided through the light guide 13. Therefore, the color light diffused by the light guide 13 and emitted into the vehicle interior also becomes color light corresponding to the filter, and the illumination effect in the vehicle interior, particularly the illumination effect, is enhanced. In order to be able to reverse the mounting direction of the portable unit 2, it is necessary to appropriately change the support structure of the portable unit 2 in the base unit 1 and the structure for electrical connection, but detailed description is omitted here. .

  In the above embodiment, the example in which the indoor lighting device is disposed on the inner ceiling of the interior of the automobile is shown. However, the same applies to the indoor lighting device configured as a so-called foot lamp that illuminates the feet of the driver seat and the passenger seat. It is possible to apply. Alternatively, the present invention can be applied in the same manner as long as it is an indoor lighting device disposed on the inner wall of the vehicle interior, that is, the inner surface of the vehicle interior, the floor surface, or the like.

  The present invention is not limited to an interior lighting device for a vehicle, but can also be employed as an interior lighting device for a normal house.

DESCRIPTION OF SYMBOLS 1 Base unit 2, 2A Portable unit 3 Reading lamp 4 Rotating variable filter part 11 Base plate 12 Groove part 13 Light guide 14 Feeding terminal 15 Engagement piece 21 Case 22 Light source part 23 Built-in battery 24 Lighting circuit 25 Power receiving terminal 26 latching groove 27 engaging recess 28a lighting switch 28b extinguishing switch 29 automatic / manual switch

Claims (4)

Is arranged in the room, and a base unit which emits illuminating light toward the chamber, is removably supported on the base unit, is composed of a portable unit comprising a light source unit that emits light, the base unit is electrically The portable unit is mounted along the surface of the base unit and emits light in a direction along the surface, and the light guide is formed from the portable unit. An indoor lighting device configured to receive and guide emitted light and emit illumination light in a direction substantially perpendicular to the surface of the base unit . The indoor lighting device according to claim 1 , wherein the portable unit emits condensed light, and the light guide emits diffused light. The indoor lighting device according to claim 1, wherein the portable unit includes a built-in battery that can be charged . The portable unit has a light on / off switch, and when mounted on the surface of the base unit, the light on / off switch is supported in the same direction as the surface. 4. The room lighting device according to any one of 3 .

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