JP2010064684A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting system configured to be thin and compact by reducing a space for each light source while having a first illumination part to be a main illumination part and a second illumination part to be a sub-illumination as a spot lump, and having a good appearance without unevenness when turned on. <P>SOLUTION: The lighting system 30 includes a flat type discharging tube 10 stored in a housing 51 having an opening part, a globe 54 closing the opening part and having a translucent lens 55 opposing to the side of a light emitting surface 12a1 serving as a surface of the flat type discharging tube 10, LEDs 58, 58 disposed on the reverse surface 12b1 side of the flat type discharging tube 10, and a circuit unit 59 provided in the inside 52 of the housing 51 and connected to the flat type discharging tube 10 and the LEDs 58, 58 through an electric wire. Light irradiated from the LED 58 is transmitted through a non-emitting region of the flat type discharging tube 10 and is irradiated to the outside via the lens. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lighting device, and more particularly to a lighting device for a vehicle such as a passenger car, a one-box car, a bus, and a truck.

  Conventionally, bulbs, small fluorescent lamps, and room lamps equipped with cold-cathode tubes have been used as lighting devices for automobile interiors. In addition to this, they are used for spot illumination of specific areas. Lamps (hereinafter referred to as “spot lamps”) are being used. The spot lamp is used, for example, to provide light when referring to a map or the like by illuminating the hand of a driver or a passenger. While room lamps are required to illuminate a relatively wide area, spot lamps are required to illuminate only a limited area.

  Thus, since the required illumination range differs between the room lamp and the spot lamp, for example, as disclosed in Patent Document 1, two types of illumination light having different illumination ranges can be obtained by one light source. A vehicle lighting device has been proposed. In this illuminating device, the light from the light source is condensed by a lens in the first state to obtain spotlight-like illumination light, and in the second state, the light from the light source is used by using a reflecting mirror. Indirect illumination light is obtained by guiding it to a light guide plate installed behind.

  As another conventional example, a room lamp light source and a spot lamp light source are prepared, and the illumination range of each lamp is individually controlled by using a lens. That is, for example, as shown in FIG. 8, a first illumination unit (illumination unit irradiated with light from a portion corresponding to 55 a of the lens 55) serving as a main illumination unit for widely illuminating the inside of the vehicle, Like a spot lamp, it is formed from a second illuminating unit (illuminating unit irradiated with light from a portion corresponding to 55b of the lens 55) as sub-illumination for confirming characters such as books and maps. ing.

  A light bulb 57 that emits relatively light light such as a so-called bulb color is used as the light source of the first illumination unit, and high-intensity LEDs 58 and 58 are used as the light source of the second illumination unit. These light sources are installed in a case 56 of the lighting device 50, and the upper side of each light source is covered with a translucent lens 55 installed so as to cover the case. FIG. 8A is a plan view of the lighting device, and FIG. 8B is a cross-sectional view taken along the line AA. Also, the wiring connected to each light source is omitted, and a lighting device that constitutes a power supply board for lighting the lamp is separated from the lighting device.

Japanese Patent Laid-Open No. 06-278530

  As described above, when a lighting device is configured by using different light sources with a room lamp and a spot lamp, it is necessary to secure a space for each light source, resulting in an increase in the size of the lighting device. End up. Further, as the number of light sources increases, the configuration of the entire apparatus becomes complicated. Furthermore, since wiring for each light source is required, the number of wirings when installing the lighting device increases, and workability at the time of installing the lighting device is reduced.

  In particular, in the illuminating device shown in FIG. 8, the light emitted from the light bulb 57 is bright inside the circle 55a1 shown in FIG. 8A and gradually darkens toward the outside. Similarly, the inside of the circles 55b1 and 55b1 is bright and gradually darkens toward the outside. Since the light source 58 is illumination as a spotlight, the outside of the circles 55b1 and 55b1 is darker than the outside of the circle 55a1. In other words, although the room lamp and the spot lamp are integrally configured as the lighting device, when viewed from the plane side of the lighting device, unevenness in brightness was seen at the time of lighting, and it was never good-looking. .

  In order to solve this problem, the distances H0, H1, and H1 between the lens 55 (55a, 55b, and 55b) and the light sources 57, 58, and 58 are increased as much as possible. It is possible to enlarge the portion (the portion of light emitted from the circles 55a1, 55b1, and 55b1). However, as a side effect, the height H of the lighting device is increased, and as a result, the lighting device is increased in size (thickness is increased).

  In addition, the light emitted from the light bulb 57 has a light bulb color, and the color is different from the daylight color emitted from the high-intensity LED 58, which is one factor that deteriorates the appearance. Therefore, it was considered to replace the light bulb 57 with a light source that emits daylight color light, but there were problems such as an increase in the space for storage and an increase in cost, and the design could not be changed easily.

  On the other hand, in the illumination device disclosed in Patent Document 1, although two types of illumination light can be obtained with one light source, indirect light is used as light with a wide illumination range, and therefore, for example, it is required for a vehicle room lamp. Such a sufficient illuminance cannot be obtained. In addition, since it is necessary to secure a space for the light guide plate behind the light source, the downsizing of the apparatus is limited particularly in the depth direction. Therefore, it is not suitable as a lighting device in a place where it is difficult to ensure a sufficient length in the depth direction, such as the ceiling of a vehicle.

  Therefore, the present invention provides a first illumination unit that is a main illumination unit for widely illuminating the interior of the vehicle, and a second illumination that is a sub-illumination for confirming characters such as books and maps like a spot lamp. It is an object of the present invention to provide an illuminating device that has a thin and compact structure by reducing the space for each light source and having a uniform appearance even when lit.

Of the present invention, the lighting device according to claim 1 is:
A plate-type light source housed in a housing having an opening;
A glove having a translucent lens that closes the opening and faces the light-emitting surface that is the surface of the plate-type light source body;
A point light source disposed on the back side of the plate-type light source;
A circuit unit provided inside or outside the housing and connected to the plate light source body and the point light source body via an electric wire,
A part of the plate-type light source body where the point light source body faces the plate-type light source body has a light-transmitting region in which light emitted from the point light source body is transmitted from the back side to the front side of the plate-like light source body. It is characterized by having.

  Here, the “plate-type light source body” refers to a light source body that is a plate-like light source body and can irradiate uniform light from the entire surface excluding the peripheral edge. Further, the “point light source body” refers to a light source that can illuminate an object spotwise with irradiation light having strong directivity.

  According to the present invention, the point light source body is disposed on the back side of the plate-type light source body housed in the housing, and the light emitted from the point light source body is turned on by turning on these light sources by the circuit unit. Since this illumination device is viewed from the lens side through a part of the mold light source body, when it is viewed from the lens side, the part illuminated from the plate light source body that is the main illumination, and the sub-illumination Since the spatial distinction from the portion irradiated from the point light source body is not clearly seen, and the light as the main illumination is uniformly irradiated by the plate-type light source body, the appearance is uniform. It becomes a lighting device. The plate-like light source body is provided with a light-transmitting region at a portion facing the point light source body so that light emitted from the point light source body is transmitted from the back side to the front side of the plate-like light source body. become.

  In addition, when the circuit unit is provided inside the lighting device, the wiring connecting the light source and the circuit unit does not appear outside the lighting device. It is not necessary to provide a space for mounting the circuit unit.

In addition to the illumination device according to claim 1, the illumination device according to claim 2
The translucent region is a non-light emitting region in the plate-type light source body.

 Here, the “non-light-emitting region” refers to a region that does not emit light by itself in a plate-type light source as a light source. That is, it means that the light from the point light source body passes and the plate-like light source band itself does not emit light.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to irradiate the light irradiated from a point light source body outside via the part of the non-light-emitting area | region in a plate-type light source body. As described above, this portion does not have a light emitting function as a plate-type light source body. Accordingly, when both the plate-type light source body and the point light source body are turned on at the same time, the light emitted from the plate-type light source body does not leak into this non-light-emitting area, so that the light emitted from the point light source body does not intersect. Therefore, the function as a point light source body with strong directivity is exhibited predominately. In addition, when both the plate-type light source body and the point light source body are turned on at the same time, when viewed from the lens side of the illuminating device, it looks as if light is uniformly emitted from the entire lens, which is very attractive. . Further, when only the point light source body is turned off and only the plate type light source body is turned on, only the part of the light-transmitting non-light emitting area in the plate type light source body is darkened. However, since the periphery of the part of the non-light emitting area is surrounded by the light emitting area, the object illuminated by the plate-type light source body as the main illumination is not illuminated by the presence of the non-light emitting area. There is virtually no problem.

  In a conventional lighting device that uses both a spotlight and a room lamp, the irradiation area that functions as a spotlight and the irradiation area that functions as a room lamp are structurally clearly defined. Thus, there is a problem that it is difficult to cover the area that can be illuminated by the room lamp.

Moreover, in addition to the illuminating device of Claim 2, the illuminating device of Claim 3 is
The plate-type light source body forms a discharge space by sealing the periphery of a pair of facing dielectric plates, and a phosphor film is provided on one of the inner surfaces of the pair of dielectric plates that form the discharge space. A flat discharge tube formed and sealed with a discharge gas in the discharge space,
The discharge space does not exist in a portion having the non-light emitting region in the flat discharge tube.

  According to the present invention, when the flat discharge tube is used as a plate-type light source body, as a means for forming the non-light emitting region, the portion is not discharged, that is, the discharge space is not formed. Can be mentioned. With such a configuration, a light-transmitting non-light-emitting region can be easily formed.

In addition to the illumination device according to claim 3, the illumination device according to claim 4 includes:
The non-light-emitting region in which the discharge space does not exist is configured by a dielectric rib formed between a pair of dielectric plates forming the flat discharge tube.

In addition to the lighting device according to claim 3, the lighting device according to claim 5
The non-light-emitting region in which the discharge space does not exist is formed by a recess that penetrates the discharge space of the flat discharge tube.

Moreover, in addition to the lighting device according to claim 3, the lighting device according to claim 6,
The non-light-emitting region where the discharge space does not exist is constituted by a through-hole penetrating from the front surface side to the back surface side of the flat discharge tube.

  According to the fourth to sixth aspects of the present invention, it is possible to easily form the non-light emitting region by not forming the discharge space. Further, the light emitted from the point light source body can suppress the attenuation of the light caused by passing through the flat discharge tube as much as possible. Therefore, an energy saving effect can be expected.

Moreover, in addition to the illuminating device of Claim 1 or Claim 2, the illuminating device of Claim 7 WHEREIN:
The plate-type light source body forms a discharge space by sealing the periphery of a pair of facing dielectric plates, and a phosphor film is provided on one of the inner surfaces of the pair of dielectric plates that form the discharge space. A flat discharge tube formed and sealed with a discharge gas in the discharge space,
The phosphor film is not present on the inner surface of the dielectric plate on the back surface side that forms the discharge space in the light-transmitting region of the flat discharge tube.

  According to the present invention, by omitting the phosphor film formed on the inner surface of the dielectric plate on the back surface side that forms the discharge space in the translucent region, visible light excited and emitted by the phosphor film is not generated. In addition, it is possible to prevent the light emitted from the point light source body from being attenuated by the phosphor film.

Moreover, in addition to the illuminating device in any one of Claims 1-7, the illuminating device of Claim 8 is
The plate-type light source body forms a discharge space by sealing the periphery of a pair of facing dielectric plates, and a phosphor film is provided on one of the inner surfaces of the pair of dielectric plates that form the discharge space. A flat discharge tube formed and sealed with a discharge gas in the discharge space,
In the translucent region of the flat discharge tube, there is no thin film electrode on either the outer surface or the inner surface of the pair of facing dielectric plates, and in the region where the flat discharge tube emits light, A thin film electrode is present on the outer or inner surface of the dielectric plate facing each other.

  According to the present invention, since any one thin-film electrode does not exist in the flat discharge tube portion in the translucent region, no discharge phenomenon occurs in this region. Therefore, since light is not irradiated, it becomes possible to transmit the light with strong directivity irradiated from a point light source.

  According to the illuminating device of the above invention, it becomes the 1st illumination part used as the main illumination part for illuminating the inside of a vehicle widely, and subillumination for confirming characters, such as a book and a map like a spot lamp. It is possible to provide a lighting device that has a second lighting unit and has a thin and compact structure by reducing the space for each light source and having a uniform appearance even when it is turned on.

(First embodiment)
1A and 1B show a lighting device according to a first embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA in the plan view.

<Overall configuration>
As shown in FIG. 1, the illuminating device of the present embodiment includes a flat discharge tube 10 as a plate-type light source body housed in a housing 51 having an opening (corresponding to the upper side of 52, 53, 53). The globe 54 having a translucent lens 55 (55a, 55b, 55b) facing the light emitting surface 12a1 which is the surface of the flat discharge tube 10 and closing the opening, and the flat discharge tube 10 LED 58, 58 as a point light source disposed on the back surface 12b1 side, and a circuit unit 59 provided in the interior 52 of the housing 51 and connected to the flat discharge tube 10 and the LEDs 58, 58 via electric wires. Has been. In addition, description of drawing is abbreviate | omitted about the wiring which connects each light source 10,58,58.

  The housing 51 has an opening partitioned into three spaces by walls 51 a and 51 a, LEDs 58 and 58 are disposed in the accommodation chambers 53 and 53, and a circuit unit 59 is disposed in the accommodation chamber 59. The flat discharge tube 10 is fixed so as to cover the opening of the housing 51 so as to oppose the upper sides of the storage chambers 53, 53, and 59.

  The flat discharge tube 10 (thickness 3 to 4 mm) forms a discharge space 16 by sealing the periphery of the glass substrates 12a and 12b as a pair of facing dielectric plates with a sealing member 13. 16 is filled with xenon gas as a discharge gas. Thin film electrodes 14a and 14b are provided on the outer surfaces 12a1 and 12b1 of the pair of glass substrates 12a and 12b. The thin film electrode 14a is transparent, but the thin film electrode 14b is not necessarily transparent. The thin film electrodes 14a and 14b may be plate electrodes, and include such thin electrodes. Further, phosphor films 15a and 15b are provided on the inner surfaces (in the discharge space 16) of the glass substrates 12a and 12b. Usually, in such a flat discharge tube, the thickness of the phosphor film 15a formed on the inner surface of the glass substrate 12a on the side that becomes the light emitting surface (front surface) is reduced, and the side opposite to the light emitting surface (back surface). The phosphor film 15b formed on the inner surface of the glass substrate 12b on the side to be formed is formed thick. The reason for this is to make it easy to transmit light due to the light emission phenomenon generated in the discharge space to the front surface side and to transmit the light to the back surface side. Note that either one of the phosphor films 15a and 15b can be omitted, but from the viewpoint described above, the phosphor film 15a is preferably omitted.

  When a high voltage is applied to the pair of thin film electrodes 14a and 14b, a discharge occurs in the discharge space 16, thereby exciting the xenon gas, and light is emitted from the light emitting surface 12a1 to the glass by the action of the phosphor films 15a and 15b. Irradiation to the outside through the substrate 12a and the thin film electrode 14a. The discharge gas is not limited to xenon gas, and other types of discharge gas may be used.

  In a part of the flat discharge tube 10 facing the LED 58, a discharge space is not provided only in a part corresponding to the part. That is, transparent ribs 12c and 12c having a height corresponding to the discharge distance d and a substantially circular cross section are provided. The rib 12c is made of transparent glass and is formed integrally with the glass substrate 12b. Since the upper surface of the rib 12c is in contact with and in close contact with the phosphor film 15a formed on the inner surface of the glass substrate 12a, only the rib 12c is a region where no discharge gas exists. Therefore, even if the flat discharge tube 10 is turned on, the portion where the rib 12c exists is not irradiated with light toward the surface, and becomes a non-light emitting region. When the LEDs 58 and 58 are turned on, the light emitted from the LEDs 58 and 58 is planarly discharged through a pair of translucent glass substrates 12a and 12b as dielectric plates and a rib 12c as a non-light emitting region. Irradiates the surface side of the tube 10. When the phosphor film 15a is omitted, the rib 12c is in direct contact with and in close contact with the inner surface of the glass substrate 12a. The fluorescent screen 15a can be omitted only in the portion where the upper surface of the rib 12c is in contact with the inner surface of the glass substrate 12a. In this way, the rib 12c is formed between the glass substrates 12a and 12b as a pair of dielectric flat plates, thereby forming a non-light emitting region. In the present embodiment, a portion (non-light emitting region) in which light can be transmitted which is a portion facing the LED 58 in the flat discharge tube 10 corresponds to a “translucent region” in the present invention.

  The globe 54 is covered from above so as to cover the flat discharge tube 10 disposed in the opening of the housing 51, and is connected and fixed to the peripheral portion of the housing 51. The globe 54 is provided with a translucent lens 55 so as to face the light emitting surface 12 a 1 of the flat discharge tube 10. Light irradiated from the LED 58 and the flat discharge tube 10 is irradiated to the outside through the lens 55. The lens 55 includes a lens portion 55 a that transmits light emitted from the light emitting surface 12 a 1 of the flat discharge tube 10 and lens portions 55 b and 55 b that transmit light emitted from the LED 58. The lens portion 55b is substantially circular and has an inner diameter corresponding to the irradiation angle of the light emitted from the LED 58. The lens portion 55a surrounds the lens portion 55b. The lens portion 55b need not be limited to a circle.

  A lens cut is applied to the inner surface of the lens portion 55a. Ribs (not shown) for supporting the glass substrates 12a and 12b are provided at various locations in the discharge space 16 of the flat discharge tube 10. When the flat discharge tube 10 is turned on, only this rib portion appears dark. As a countermeasure against this, a lens cut is provided on the inner surface of the lens portion 55a so that the shaded portion of the rib does not appear on the outer surface.

<Action and function>
Next, a comparison between the lighting device 30 of the present embodiment and the conventional lighting device 50 shown in FIG. FIG. 2 schematically shows a state where the illumination device 30 of the present embodiment illuminates the object 100. FIG. 9 schematically shows a state where the conventional illumination device 50 shown in FIG. 8 illuminates the object 100.

  FIG. 9 shows the light irradiation state when the conventional lighting device 50 is mounted indoors or on the ceiling of a vehicle or the like. Therefore, the irradiation surface (the surface corresponding to the plan view of FIG. 7A) faces downward. FIG. 9A shows a case where both light sources of the light bulb 57 serving as the main illumination and the LED 58 serving as the secondary illumination are turned on. When the object 100 is irradiated at a predetermined distance from the lower surface of the lighting device 50, the main strong light emitted from the light bulb 57 illuminates the area of the width B1, and the strong light emitted from the LEDs 28 and 58 is Illuminate the area of B2 and B2. Note that weak light as main illumination emitted from a portion other than the circle of the lens 55a illuminates a wide area such as a width B1 '.

  FIG. 9B shows a case where only the LED 58 serving as the sub-illumination is turned on. In this case, since it has a function as a spotlight, the area of width B2 and B2 is illuminated brightly. FIG. 9C shows a case where only the light bulb 57 serving as the main illumination is turned on. In this case, the region with the width B1 is irradiated with strong light, and the region with the width B1 'is irradiated with weak light. Therefore, in the case of FIGS. 9B and 9C, the brightness of the surface that illuminates the object 100 varies depending on the location, and as a result, the function of irradiating a wide space with constant brightness is lacking. You can see that On the other hand, as shown in FIG. 9B, even when the LED 58 is turned on, the area B2 is irradiated with strong light, but does not block the light leaking to the surrounding area, so the surrounding area is covered with a dim light. It was never a good light distribution.

  FIG. 2 shows a light irradiation state when the lighting device 30 of the present embodiment is mounted indoors or on the ceiling of a vehicle or the like. Therefore, the irradiation surface (the surface corresponding to the plan view of FIG. 2A) faces downward. FIG. 2A shows a case where both the light source of the flat discharge tube 10 as the main illumination and the LED 58 as the sub illumination are turned on. When the object 100 is irradiated at a predetermined distance from the lower surface of the illuminating device 30, the main strong light emitted from the flat discharge tube 10 illuminates the area of the width B4 and the strong light emitted from the LEDs 58 and 58. Illuminates only the region of width B3, B3.

  FIG. 2B shows a case where only the LEDs 58 and 58 serving as sub-illuminations are turned on. In this case, since it has a function as a spotlight, only the area of width B3, B3 is brightly illuminated, and light leakage to the peripheral part is distributed by the non-light emitting area in the flat discharge tube 10 and the lens 55b. It hardly occurs because the light is limited. Therefore, when viewed from the outside, clear and ideal partial irradiation as spot illumination is realized.

  FIG. 2C shows a case where only the flat discharge tube 10 serving as the main illumination is turned on. In this case, the light irradiated from the lens 55a surrounds the periphery of the lenses 55b and 55b, and the irradiation angle α of the light irradiated from the flat discharge tube 10 is the irradiation of the light irradiated from the LED 58. Since it is much larger than the angle β (see arrow 92), except for the areas such as the shaded portions 91 and 91 in FIG. 2C, the object 100 that is directly below the circular portions of the lenses 55b and 55b. Brightly illuminate the part. Therefore, according to the irradiation of light from the flat discharge tube 10, it is possible to irradiate a region having a wide width B4 with uniform brightness as the main illumination.

<Operations and effects grasped from the first embodiment>
The actions and effects grasped from the first embodiment are listed below.
(1) An LED 58 as a point light source is arranged on the back side of the flat discharge tube 10 as a plate type light source housed in the housing 51, and these light sources are turned on by the circuit unit 59. For this reason, the light emitted from the LED 58 is emitted to the surface side through a part of the flat discharge tube 10 via the circular lens 55b, so that the illumination device 30 is viewed from the lens side. Is a spatial distinction between a portion irradiated from the flat discharge tube 10 as the main illumination and a portion irradiated from the point light source body as the sub-illumination even when only the flat discharge tube 10 is lit. Is not clearly seen, and the plate-type light source is uniformly irradiated with the light that is the main illumination, so that the illumination device has a uniform appearance (see FIG. 2C).

(2) Since the flat discharge tube 10 is used as the main illumination power source and disposed above the opening of the housing 51, the circuit unit 59 can be disposed in the space 52 where the conventional light bulb 57 is disposed. . Therefore, since the wiring connecting the light source and the circuit unit does not appear outside the lighting device, workability at the time of installing the lighting device is improved, and a space for attaching the circuit unit to the external space may not be provided.

(3) The flat discharge tube 10 is used as the main illumination power source, and is disposed above the opening of the housing 51. The thickness of the flat discharge tube 10 is 3 to 4 mm, which is very thin. Further, uniform light is emitted from the light emitting surface 12a1 over a wide range, so that it is not necessary to increase the distance between the lens and the light source as in the prior art. . Therefore, the thickness H ′ of the lighting device is smaller (see FIG. 1) than the thickness H (see FIG. 8) of the conventional lighting device.

(4) A translucent rib 12c formed integrally with the glass substrate 12b is provided in a portion of the discharge space 16 of the flat discharge tube 10 facing the LED 58 as the sub-illumination. As a result, the discharge phenomenon is prevented from occurring in this portion, and only the light emitted from the LED 58 is transmitted. With such a configuration, a light-transmitting non-light-emitting region can be easily formed.

(Second Embodiment)
FIG. 3A shows a lighting device according to the second embodiment of the present invention. In this figure, since the internal structure shown in this cross-sectional view is symmetrical, only a partial cross-sectional view (left side) is shown. In the present embodiment, thin film electrodes 14a and 14b are formed on the outer surfaces of the pair of glass substrates 12a and 12b in a portion that becomes a non-light emitting region of the flat discharge tube 10, that is, a portion where ribs exist inside the discharge space 16. Was not provided. Thereby, the transmittance of light in the non-light emitting region is increased, and attenuation of light emitted from the LED 58 can be reduced. One of the thin film electrodes 14a and 14b may be omitted. Further, as shown in FIG. 3B, the phosphor film 15a may be omitted.

(Third embodiment)
FIG. 4 shows a lighting device according to a third embodiment of the present invention. In this figure, since the internal structure shown in this cross-sectional view is symmetrical, only a partial cross-sectional view (left side) is shown. In the present embodiment, as shown in FIG. 4A, a concave portion 12f is provided by molding on the outer surface side of one glass substrate 12b, and the height of the convex portion 12g on the inner surface side is set to the discharge space distance of the discharge space 16. And almost the same. And the area | region which does not produce a discharge phenomenon is formed by making this convex part upper surface contact | abut to the inner surface of the other glass substrate. With such a configuration, a light-transmitting non-light-emitting region can be easily formed. In addition, you may make it provide a convex part in the inner surface side in the glass substrate 12a. Further, when the concavo-convex portion is provided on the glass substrate 12b, the tip of the LED 58 can be disposed close to the concave portion (see FIG. 4B), and the thickness H of the lighting device is accordingly increased. '' Becomes smaller (H '>H'').

(Fourth embodiment)
FIG. 5 shows a lighting device according to a fourth embodiment of the present invention. In this figure, since the internal structure shown in this cross-sectional view is symmetrical, only a partial cross-sectional view (left side) is shown. In this embodiment, a hole is formed in one of the pair of glass substrates 12a and 12b, and a part of the resulting discharge space 16 is sealed by the sealing member 13a. By adopting such a configuration, a non-light emitting region is formed in a part of the flat discharge tube 10 so that light emitted from the LED 58 is transmitted. FIG. 6A shows the case where the hole 12d is formed only in the glass substrate 12b, but the hole may be formed only in the glass substrate 12a. FIG. 6B shows a case where the holes 12d and 12e are formed in both the pair of glass substrates 12a and 12b.

(Fifth embodiment)
FIG. 6A shows a lighting device according to a fifth embodiment of the present invention. In this figure, since the internal structure shown in this cross-sectional view is symmetrical, only a partial cross-sectional view (left side) is shown. The phosphor film 15b formed on the inner surface of the glass substrate 12b on the back surface side (opposite the light emitting surface) of the normal flat discharge tube 10 is thickened. This is to prevent the light irradiated from the discharge space from being transmitted to the back side, but at the same time, the light from the LED 58 is not easily passed. In the present embodiment, as a means for realizing a portion that becomes a light transmitting region of the flat discharge tube 10, the phosphor film 15 b is not provided in the discharge space 16 corresponding to the portion. In this case, although a discharge phenomenon occurs in this region, a light emission phenomenon due to the phosphor film 15b does not occur. Therefore, light emitted from the LED 58 passes through the flat discharge tube 10 via the thin phosphor film 15a. To Penetrate.

  The light that is excited and emitted by the phosphor film 15 a is transmitted to the surface side of the flat discharge tube 10. For this reason, when the light emitted from the LED 58 passes through the flat discharge tube 10, it does not intersect with the light emitted by the phosphor film 15 a, but after passing through the flat discharge tube 10. Crosses with light excited and emitted by the phosphor film 15a. However, the light excited and emitted by the phosphor film 15a does not interfere with the light emitted from the LED 58 because the phosphor film 15a is thin and the light emission is weak. As shown in FIG. 6B, the phosphor film 15a may be omitted in this portion. By doing so, no light that is excited and emitted by the phosphor film 15a is generated, so that it does not intersect with the light emitted from the LED 58.

(Sixth embodiment)
FIG. 7 shows a lighting device according to a sixth embodiment of the present invention. In this figure, since the internal structure shown in this sectional view is symmetrical, only a partial sectional view (left side) is shown. In the present embodiment, as means for realizing a portion that becomes a light-transmitting region of the flat discharge tube 10, the phosphor films 15 a and 15 b are not provided in the discharge space 16 corresponding to the portion, and a pair The thin film electrodes 14a and 14b were not provided on the outer surfaces of the glass substrates 12a and 12b. As a result, the discharge phenomenon and the light emission phenomenon due to the phosphor film do not occur in this region, and as a result, the light-transmitting region can be easily formed. In such a light-transmitting region, no light is emitted by a direct discharge phenomenon, but there is light emitted from the periphery of the light-transmitting region, so that a faint dim light leaks. For this reason, the flat discharge tube 10 is not a complete non-light emitting region.

(Application examples)
By the way, this invention is not limited to the said embodiment, Various implementation is possible in the range which does not change the summary of this invention.
The flat discharge tube 10 serving as the main illumination used in the above embodiment has a structure having thin film electrodes on the outer surfaces of a pair of glass substrates, but is not limited to this, and at least one thin film electrode has It may be arranged on the inner surface of the glass substrate. Moreover, when arrange | positioning a pair of thin film electrode on the inner surface of both glass substrates, it is necessary to form a dielectric film on the upper surface of at least any one thin film electrode.

  -In the said embodiment, although LED58 is arrange | positioned 1 each at the both ends of the illuminating device 30, it is not limited to this. A plurality of LEDs may be used, or a single LED may be used. For example, the LED may be arranged at the center of the lighting device 30.

  In the embodiment, the light irradiation direction of the LED 58 and the light irradiation direction of the flat discharge tube 10 are perpendicular to the installation surface of the lighting device 30, but the present invention is not limited to this. The arrangement of the LEDs 58 may be inclined to change the irradiation direction as spot illumination, or the direction may be changed without being fixed.

  -In the said embodiment, point light source bodies other than LED may be used, for example, a light bulb with strong directivity may be sufficient.

  In the embodiment, an opaque member for preventing light from being transmitted to the back surface side may be provided on the back surface side corresponding to a region other than the light transmitting region of the flat discharge tube 10. In addition, you may make it provide a reflection member in the surface side affixed on a planar discharge tube in this member. Further, the thin film electrode 14b may be an opaque electrode and may not be formed in a portion corresponding to the light transmitting region.

  ・ The point light source is often an LED that emits daylight color, but if a flat discharge tube is used as a plate-type light source, the phosphor type should be the same daylight color as the LED. As a result, even when both light sources are turned on, the lighting state is uniform and looks good.

  -The "plate-type light source body" in this invention is not limited to the planar discharge tube applied in the said embodiment. For example, it is also possible to use an electron emission type flat light emitting panel using an electron emission source such as nano silicon or nano carbon. It is also possible to use a light emitting panel using organic EL.

It is an illuminating device in 1st Embodiment, Comprising: (a) is a top view, (b) is AA sectional drawing of (a). It is a schematic diagram which shows the light distribution state of the light of the illuminating device in 1st Embodiment, (a) when both a main light source and a sublight source are lighted, (b) is when only a sublight source is lighted, ( c) is an explanatory diagram when only the main light source is turned on. It is a partial cross section figure of the illuminating device in 2nd Embodiment. It is a partial cross section figure of the illuminating device in 3rd Embodiment. It is a partial cross section figure of the illuminating device in 4th Embodiment. It is a partial cross section figure of the illuminating device in 5th Embodiment. It is a partial cross section figure of the illuminating device in 6th Embodiment. It is the conventional illuminating device, Comprising: (a) is a top view, (b) is AA sectional drawing of (a). It is a schematic diagram which shows the light distribution state of the conventional illuminating device shown in FIG. 8, (a) when both a main light source and a sub-light source are lighted, (b) is when only a sub-light source is lighted, c) is an explanatory diagram when only the main light source is turned on.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Planar discharge tube as a plate-type light source body, 58 ... LED as a point light source body, 30 ... Illuminating device, 51 ... Housing, 55 ... Lens, 54 ... Globe, 12c ... Rib which forms a non-light-emitting region .

Claims (8)

A plate-type light source housed in a housing having an opening;
A glove having a translucent lens that closes the opening and faces the light-emitting surface that is the surface of the plate-type light source body;
A point light source disposed on the back side of the plate-type light source;
A circuit unit provided inside or outside the housing and connected to the plate light source body and the point light source body via an electric wire,
A part of the plate-type light source body where the point light source body faces the plate-type light source body has a light-transmitting region in which light emitted from the point light source body is transmitted from the back side to the front side of the plate-like light source body. Have
A lighting device characterized by that.   The lighting device according to claim 1, wherein the light-transmitting region is a non-light-emitting region in the plate-type light source body. The plate-type light source body forms a discharge space by sealing the periphery of a pair of facing dielectric plates, and a phosphor film is provided on one of the inner surfaces of the pair of dielectric plates that form the discharge space. A flat discharge tube formed and sealed with a discharge gas in the discharge space,
The lighting device according to claim 2, wherein a portion having the non-light emitting region in the flat discharge tube includes a region where the discharge space does not exist. The non-light-emitting region where the discharge space does not exist is constituted by a dielectric rib formed between a pair of dielectric flat plates forming the planar discharge tube.
The lighting device according to claim 3. The non-light-emitting region where the discharge space does not exist is constituted by a recess penetrating the discharge space of the planar discharge tube;
The lighting device according to claim 3. The non-light-emitting region where the discharge space does not exist is constituted by a through-hole penetrating from the front surface side to the back surface side of the flat discharge tube;
The lighting device according to claim 3. The plate-type light source body forms a discharge space by sealing the periphery of a pair of facing dielectric plates, and a phosphor film is provided on one of the inner surfaces of the pair of dielectric plates that form the discharge space. A flat discharge tube formed and sealed with a discharge gas in the discharge space,
3. The illumination according to claim 1, wherein a phosphor film does not exist on the inner surface of the dielectric plate on the back surface side that forms a discharge space in the light-transmitting region of the planar discharge tube. apparatus. The plate-type light source body forms a discharge space by sealing the periphery of a pair of facing dielectric plates, and a phosphor film is provided on one of the inner surfaces of the pair of dielectric plates that form the discharge space. A flat discharge tube formed and sealed with a discharge gas in the discharge space,
In the translucent region of the flat discharge tube, there is no thin film electrode on either the outer surface or the inner surface of the pair of facing dielectric plates, and in the region where the flat discharge tube emits light, The illuminating device according to any one of claims 1 to 7, wherein a thin film electrode is present on an outer surface or an inner surface of the dielectric flat plate facing each other.

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