JP2003162917A - Planar light emitting device and guide lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a planar light emitting device 13 having a reflector 46 movable toward the front face of a light guide plate 36 at the replacement of a light source, prevented the leakage of light from between the reflector 46 and the light guide plate 36 and enhanced the efficiency of light incidence on the light guide plate 36. <P>SOLUTION: The light source 45 and the reflector 46 are placed on the plane of incidence 37 of the light guide plate 36. The light from the light source 45 enters the plane of incidence 37 and exits from the front face 36b crossing the plane of incidence 37 of the light guide plate 36. The light source 45 and the reflector 46 are held with a light source holder 44 which is attached and removed from the side of the front face of the light guide plate 36. The reflector 46 is cut out to have an opening directed to the plane of incidence of the light guide plate 36. An end part of the opening on the front face side 48 is longer than the other on the back face side 49 and the elongated part is overlaid on the front face of the light guide plate 36. These prevent the leakage from between the end part of the opening 48 of the reflector 46 and the light guide plate 36, enhance the efficiency of light incidence into the plate 36, improve its luminous efficiency and allow the reflector 46 to move toward the front face of the light guide plate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface emitting device and a guide light using a light guide plate.

[0002]

2. Description of the Related Art Heretofore, as a surface emitting device using a light guide plate, there has been known a structure utilizing a guide light as described in, for example, Japanese Patent Laid-Open No. 2000-149626. This guide light has an instrument main body having a built-in lighting means, and a surface emitting device is attached to at least the front surface of the instrument main body.

The surface emitting device has a light guide plate, and has a light source and a light source along a light entrance surface on one side of the light guide plate, and has a substantially U-shaped cross section that opens toward the light entrance surface of the light guide plate. A reflection plate is arranged, and a display panel showing a pattern of inductive display is arranged on the light emitting surface of the surface of the light guide plate. Then, the direct light from the light source and the reflected light obtained by reflecting the light from the light source on the reflector enter the inside from the light entrance surface of the light guide plate and exit from the surface of the light guide plate to illuminate the guide display of the display panel.

Further, the light source and the reflector are held by a light source holder, and this light source holder is detachably attached to the surface emitting device or the main body of the apparatus in order to enable replacement of the light source. The structure for attaching and detaching the light source holder includes a structure for attaching and detaching from the direction parallel to the surface of the light guide plate, and a structure for attaching and detaching from the surface side of the light guide plate in a direction substantially vertical to the surface of the light guide plate. In the structure where the light source holder is attached / detached in the direction parallel to the surface of the light guide plate, it is not possible to remove only the light source holder after installing the guide light on the ceiling, and it is necessary to remove other parts such as the light guide plate. However, in the structure in which the light source holder is attached / detached from the front surface side of the light guide plate, only the light source holder can be attached / detached even after the guide lamp is installed on the ceiling, and the light source can be easily replaced.

The opening end on the front surface side of the reflector located on the front surface side of the light guide plate and the opening end on the back surface side of the reflector located on the back surface side of the light guide plate are formed to have the same length. Of the light guide plate, that is, there is a gap between each of the light entrance faces of the light guide plate. In particular, in the structure in which the light source holder is attached and detached from the front surface side of the light guide plate, in order to allow movement of the reflector plate when attaching and detaching the light source holder, a gap between both opening ends of the reflector and the light entrance surface of the light guide plate is allowed. Each needs a gap.

[0006]

However, in the conventional structure, the opening end on the front surface side and the opening end on the back surface side of the reflector are formed to have the same length, and the opening end portion of the light guide plate with respect to the light entrance surface is formed. Since they are arranged so that they face each other, that is, there is a gap between each of the light-entering surfaces of the light guide plate, light leakage occurs from these gaps, the efficiency of light incidence on the light guide plate is reduced, and the light emission of the light guide plate is reduced. There is a problem of reduced efficiency.

Light leakage from the gap between the light guide plate and the opening end on the surface side of the reflector causes light leakage to the outside.
Due to light leakage from the gap between the light guide plate and the opening end on the back surface side of the reflector, there is a problem that the wiring inside the instrument body is irradiated with light and deteriorates.

The present invention has been made in view of the above circumstances, and permits the movement of the reflector when the light source holder is attached and detached from the surface side of the light guide plate when the light source is replaced, and then the reflector and the light guide plate. It is an object of the present invention to provide a surface light emitting device and a guide light that prevent light from leaking between them, increase the efficiency of light incident on the light guide plate, and improve the light emission efficiency of the light guide plate.

[0009]

A surface emitting device according to claim 1, wherein the light guide plate has a light entrance surface and a light exit surface on a surface side intersecting the light entrance surface; A light source for irradiating the light source; the light source is included and is provided in a cross-sectional shape that opens toward the light-entering surface of the light guide plate, and the opening end on the front surface side located on the front surface side of the light guide plate is on the back surface side A reflector provided longer than the opening end on the rear surface side; a light source holder that holds the light source and the reflector and is attached / detached from the front surface side of the light guide plate.

Further, in this structure, since the opening end on the front surface side of the reflector is provided longer than the opening end on the back surface side, when the light source holder is attached and detached from the front surface side of the light guide plate, While permitting movement, light leakage is prevented from occurring between the light guide plate and the opening end on the front surface side of the reflector, the efficiency of light incidence on the light guide plate is increased, and the light emission efficiency of the light guide plate is improved. .

The surface emitting device according to claim 2 has a light guide plate having a light entrance surface and having a light exit surface on the surface side crossing the light entrance surface; and a light source for irradiating the light entrance surface of the light guide plate with light. The light source is included and provided in a cross-sectional shape that opens toward the light entrance surface of the light guide plate, and the opening end on the surface side located on the surface side of the light guide plate is provided at a position overlapping the surface side of the light guide plate. And a light source holder that holds the light source and the reflector and is attached / detached from the front surface side of the light guide plate.

Further, in this structure, since the opening end portion on the front surface side of the reflector is provided at a position overlapping with the front surface side of the light guide plate,
When the light source is replaced, the reflector is allowed to move when attaching or detaching the light source holder from the front side of the light guide plate, and light leakage is prevented between the opening end on the front side of the reflector and the light guide plate. The efficiency of light incident on the light plate is increased, and the light emission efficiency of the light guide plate is improved.

According to another aspect of the surface emitting device of the present invention, the light guide plate has a light entrance surface and has a light exit surface on the surface side intersecting the light entrance surface; and a light source for irradiating the light entrance surface of the light guide plate with light. The light source is included and is provided in a cross-sectional shape that opens toward the light entrance surface of the light guide plate, and the front surface side opening end located on the front surface side of the light guide plate is located on the back surface side of the light guide plate. A reflector provided at a position that is longer than the end portion and overlaps the surface side of the light guide plate; a light source holder that holds the light source and the reflector and is attached / detached from the surface side of the light guide plate.

Further, in this structure, since the opening end on the front surface side of the reflector is provided at a position longer than the opening end on the back surface and overlapping the front surface side of the light guide plate, the light source holder is replaced with the light source holder surface when replacing the light source. Allowing the reflector to move when it is attached or detached from the side, prevents light from leaking between the light guide plate and the opening end on the front side of the reflector, and increases the efficiency of light incidence on the light guide plate. The luminous efficiency of the light guide plate is improved.

A surface emitting device according to a fourth aspect is the surface emitting device according to any one of the first to third aspects, in which the opening end on the back side of the reflector is shorter than the opening end on the front side of the reflector. A light shield is provided at a position that does not overlap the front and back surfaces of the light plate, and shields light between the opening end on the back surface side of the reflector and the back surface of the light guide plate.

Further, in this structure, the opening end portion on the back surface side of the reflector is provided at a position shorter than the opening end portion on the front surface side of the reflector so as not to overlap in the front and back direction of the light guide plate, and the back surface of the reflector is shielded by the light shield. Since the light is blocked between the opening end on the side of the light guide plate and the back side of the light guide plate, the light source holder is allowed to move when the light source holder is attached to and detached from the front side of the light guide plate when the light source is replaced. Light leakage from between the opening end and the light guide plate is prevented,
The incidence efficiency of light on the light guide plate is increased, and the light emission efficiency of the light guide plate is improved.

An induction lamp according to a fifth aspect comprises the surface emitting device according to any one of the first to fourth aspects, in which an induction display section is provided on the surface of the light guide plate; and a lighting means for turning on the light source. It is what

Further, in this structure, since the surface light emitting device according to any one of claims 1 to 4 having the guide display portion provided on the surface of the light guide plate is provided, the light emitting efficiency of the light guide plate is high.
The visibility of the guide display section is improved.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a surface emitting device for an induction lamp, and FIG.
FIG. 3 is a perspective view of a part of the surface emitting device of the guide light, and FIG. 3 is a perspective view of the guide light in an exploded state.

As shown in FIG. 3, the guide light 11 is a device body.
12 and surface emitting devices 13 attached to both sides of the instrument body 12.

The instrument body 12 is made of synthetic resin and has a rectangular frame portion 16. An opening 17 is formed on one surface of the frame portion 16, and the other surface of the frame portion 16 is closed by a back plate 18. , Storage compartment inside
19 are formed.

An electric wire insertion hole for ceiling mounting is provided on the upper side of the frame portion 16.
20 is formed by a knockout structure and a plurality of mounting holes 21 are formed, and the back plate 18 has wire insertion holes for wall mounting.
22 is formed by a knockout structure, and a plurality of mounting holes 23 are formed.

Mounting portions 25 having mounting grooves 24 at different height positions are formed on both sides of the frame portion 16 on the side of the opening 17 and similar mountings (not shown) on both sides of the frame portion 16 on the rear plate 18 side. A mounting portion having a groove is formed.

In the central portion of the housing portion 19 of the frame portion 16, a lighting unit as a lighting means in which an inverter circuit and the like are stored.
26 is attached, a terminal block 27 is attached to the upper side of the lighting unit 26, and a battery 28 is attached to the lower side of the lighting unit 26. Lighting unit 26 and terminal block 27
Is electrically connected by a wiring cord 29, and a wiring cord having a connector 30 at the tip from the lighting unit 26.
Two lines of 31 are pulled out.

Further, as shown in FIGS. 1 to 3, the surface emitting device 13 includes an opening 17 on both sides of the instrument body 12 and a back plate.
The surface emitting portion 34 is formed in a quadrangular shape having substantially the same size as that of 18, and has a quadrangular plate shape, and a light source portion 35 disposed above the surface emitting portion 34.

The surface emitting portion 34 has a light guide plate 36 made of, for example, acrylic resin and formed in a rectangular plate shape, and an end face of one side 36a of the light guide plate 36 is an incident surface 37 on which light is incident. The surface 36b is formed and is formed on the light emitting surface 38 that emits the light that is incident inside. A display panel 40 as a guide display unit on which a pictogram 39 is displayed is attached to the front surface 36b side of the light guide plate 36, and light incident on the light guide plate 36 is reflected toward the light exit surface 38 on the back surface 36c side. No reflection means is provided. On both sides of the back surface of the light guide plate 36,
A mounting portion 41 is provided so as to project in correspondence with the position of each mounting portion 25 of the instrument body 12, and the mounting groove 24 of the mounting portion 25 is formed on the outer surface of the mounting portion 41.
An engaging claw 42 is provided so as to be detachably engaged with the mounting portion 25 in a state of being inserted into the.

The light source section 35 has a case 43 which is arranged above the light guide plate 36 and holds the light guide plate 36. A light source holder 44 constituting the surface side of the case 43 has a light guide plate with respect to the case 43.
The surface 36b of the light guide plate 36 is in a direction substantially vertical to the surface 36b of the light guide plate 36.
It is provided to be removable from the side.

Inside the light source holder 44, the light entrance surface 37 of the light guide plate 36 is provided.
A straight tube-shaped light source 45 such as a cold cathode discharge lamp, which is arranged opposite to the light source 45, is held, and the light source 45 is included to direct the light from the light source 45 toward the light incident surface 37 of the light guide plate 36. A reflector 46 for reflecting is held.

A lamp socket (not shown) is connected to both ends of the light source 45, and a socket 47 is connected to the lamp socket via a cord (not shown). The socket 47 is attached so as to face the back side of the case 43. The connector 30 on the main body 12 side is detachably connected.

The reflector 46 is a curved surface portion 46 facing the light source 45.
a and the surface 36b of the light guide plate 36 from both ends of this curved surface portion 46a
And a linear portion 46b, 46c extending parallel to the back surface 36c and having a substantially U-shaped cross-section that opens toward the light entrance surface 37 of the light guide plate 36, and the length of the light source 45 in the axial direction. Is formed so as to include the entire length region of the light source 45 excluding the lamp socket portions at both ends of the light source 45.

An opening end 48 on the front surface side of the reflector 46, which is an end of one linear portion 46b located on the front surface 36b side of the light guide plate 36.
Is extended to be longer than the opening end 49 on the back surface side of the reflector 46 which is the end of the other linear portion 46c located on the back surface 36c side of the light guide plate 36, and at a position overlapping the front surface 36b side of the light guide plate 36. Will be placed. The opening end 49 on the back surface side is shorter than the opening end portion 48 on the front surface side, and is arranged at a position where there is a gap without overlapping the front and back surfaces of the light guide plate 36.

The case 43 is provided with a light shield 50 that shields light leaking from the gap between the opening end 49 on the back surface side of the reflector 46 and the back surface 36c of the light guide plate 36. This shader 50
Is formed in a substantially L-shaped cross section having a protruding portion 51 protruding in a substantially vertical direction on the upper end side of the back surface 36c of the light guide plate and a rising portion 52 raised from the tip of the protruding portion 51. The opening end 49 on the back surface side of the reflector 46 is arranged so as to overlap the front surface side.

Next, the usage of this embodiment will be described.

When mounting the instrument body 12 on the ceiling surface, the electric wire insertion hole 20 is opened, the power wire drawn from the ceiling surface is passed through the electric wire insertion hole 20, and each mounting screw is inserted through each mounting hole 21. The device body 12 is fixed to the terminal block 27 by screwing it to the terminal block 27.

When the instrument body 12 is mounted on the wall,
Open the electric wire insertion hole 22, pass the power supply wire drawn from the wall through the electric wire insertion hole 22, screw each mounting screw to the wall through each mounting hole 23 to fix the instrument main body 12, and connect the power supply wire to the terminal block. 27
Connect to.

Even when the instrument body 12 is attached to the ceiling surface, in the case of single-sided display or when attached to the wall surface, the instrument body 12
Attach the surface emitting device 13 to the opening 17 side of the 12
When the is installed on the ceiling surface and the display is double-sided,
Surface emitting devices 13 are attached to both sides of the opening 17 side and the back plate 18 side of 12 respectively.

To attach the surface emitting device 13 to the instrument body 12, the socket 30 of the surface emitting device 13 is connected to the connector 30 on the instrument body 12 side, and each mounting portion 41 of the surface emitting device 13 is attached to the instrument body 12.
It is inserted and locked in each mounting part 25.

By turning on the light source 45,
Direct light from the light source 45 and light reflected from the light source by the reflector 46 enter the inside of the light guide plate 36 from the light entrance surface 37 of the light guide plate 36 and exit from the light exit surface 38 of the surface of the light guide plate 36. Then, the display panel 40 is illuminated and the pictogram 39 is caused to emit light.

At this time, the opening end 48 on the surface side of the reflector 46 is formed.
Is provided at a position that is longer than the opening end 49 on the back surface side and overlaps with the surface 36b side of the light guide plate 36, so that light leakage from between the opening end 48 on the surface side of the reflector 46 and the light guide plate 36 is prevented. It is possible to prevent the light from leaking to the outside, improve the efficiency of light incident on the light guide plate 36, and improve the light emission efficiency of the light guide plate 36.

Further, the opening end portion 49 on the back surface side of the reflector 46 is provided at a position shorter than the opening end portion 48 on the front surface side of the reflector 46 so as not to overlap in the front and back direction of the light guide plate 36, and the light shielding member 50 serves as a reflector. Since light is shielded between the opening end portion 49 on the back surface side of 46 and the back surface 36c of the light guide plate 36, light leakage from between the opening end portion 49 on the back surface side of the reflector 46 and the light guide plate 36 is prevented, It is possible to prevent deterioration of the wiring cords 29, 31 and the like in the device body 12 due to light leakage,
It is possible to increase the efficiency of light incident on the light guide plate 36 and improve the light emission efficiency of the light guide plate 36.

When the light source is replaced, the light source holder 44 is removed while moving it in a substantially vertical direction with respect to the surface 36b of the light guide plate 36, so that the light source 45 and the reflector 46 are removed together with the light source holder 44.

The old light source 45 is removed from the removed light source holder 44 and a new light source 45 is mounted, and this light source holder 44 is mounted on the surface 36b of the light guide plate 36 while moving in a substantially vertical direction.

At this time, the opening end 48 on the surface side of the reflector 46 is formed.
Is at a position overlapping the surface 36b side of the light guide plate 36,
Since the opening end 49 on the back surface side of the reflector 46 is located at a position where it does not overlap in the front and back surface directions of the light guide plate 36, the light source holder 44 is fixed to the light guide plate 36.
It is possible to allow movement of the reflector 46 when removing and attaching from the surface 36b side of the.

As described above, the opening end portion on the front surface side of the reflector 46
The light source holder 44 is provided at the time of replacing the light source because the 48 is provided at a position longer than the opening end 49 on the back surface side and overlapping with the front surface 36b side of the light guide plate 36.
Allowing the movement of the reflector 46 when attaching and detaching from the surface 36b side of the light guide plate 36, and preventing light leakage from between the opening end 48 on the surface side of the reflector 46 and the light guide plate 36, It is possible to increase the efficiency of light incident on the light guide plate 36 and improve the light emission efficiency of the light guide plate 36.

Further, the opening end portion 49 on the back surface side of the reflector 46 is provided at a position shorter than the opening end portion 48 on the front surface side of the reflector 46 and at a position not overlapping in the front and back direction of the light guide plate 36, and the light shielding member 50 serves as a reflector. Since light is shielded between the opening end portion 49 on the rear surface side of 46 and the rear surface 36c of the light guide plate 36, the light source holder 44 is attached to the front surface 36 of the light guide plate 36 when replacing the light source.
Allowing the movement of the reflector 46 when attaching and detaching from the b side, preventing light leakage between the light guide plate 36 and the opening end 49 on the rear surface side of the reflector 46, and preventing light from entering the light guide plate 36. It is possible to increase the incident efficiency of the light and improve the luminous efficiency of the light guide plate 36.

Therefore, as the guide light 11, the light guide plate 36
The luminous efficiency is high, and the visibility of the pictogram 39 of the display panel 40 can be improved.

The surface emitting device 13 is a guide light for displaying other guide displays by replacing the display panel 40.
11 or can be applied not only to the guide light 11 but also to a display device or a lighting device such as a display light for displaying a pattern, characters, etc., and the same effects can be obtained.

[0049]

According to the surface emitting device of the first aspect of the present invention, since the opening end on the front surface side of the reflector is provided longer than the opening end on the back surface side, the light source holder is placed on the front surface side of the light guide plate when the light source is replaced. Allowing the reflector to move when attaching or detaching from the light guide, preventing light from leaking between the light guide plate and the open end on the front side of the reflector, and increasing the efficiency of light incidence on the light guide plate. The luminous efficiency of the light plate can be improved.

According to the surface emitting device of the second aspect, since the opening end portion on the front surface side of the reflector is provided at a position overlapping with the front surface side of the light guide plate, the light source holder is moved from the front surface side of the light guide plate when the light source is replaced. Allowing the reflector to move when attaching and detaching, preventing light leakage between the light guide plate and the opening end on the front side of the reflector, and increasing the efficiency of light incidence on the light guide plate. The luminous efficiency of can be improved.

According to the surface emitting device of the third aspect, since the opening end on the front side of the reflector is provided at a position overlapping the front side of the light guide plate longer than the opening end on the back side, the light source is replaced when the light source is replaced. Allowing the movement of the reflector when attaching and detaching the holder from the front side of the light guide plate, prevents light leakage between the opening end on the front side of the reflector and the light guide plate, and It is possible to increase the incident efficiency of light and improve the light emission efficiency of the light guide plate.

According to the surface emitting device of the fourth aspect, in addition to the effect of the surface emitting device according to any one of the first to third aspects, the opening end portion on the back surface side of the reflector is provided on the front surface side of the reflector. It is provided at a position shorter than the opening end so that it does not overlap in the front and back directions of the light guide plate, and the light shield blocks the space between the opening end on the back surface side of the reflector and the back surface of the light guide plate. Allows movement of the reflector when attaching and detaching from the front side of the light plate, prevents light leakage between the light guide plate and the opening end on the back side of the reflector, and improves the efficiency of light incidence on the light guide plate. And the luminous efficiency of the light guide plate can be improved.

According to the fifth aspect of the present invention, since the guide light is provided with the surface light emitting device according to any one of the first to fourth aspects, the surface of the light guide plate is provided with the guide display portion. It is high, and the visibility of the guide display section can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a surface emitting device for a guide light showing an embodiment of the present invention.

FIG. 2 is a perspective view of a part of the surface light emitting device of the above guide light.

FIG. 3 is a perspective view of the guide light in the disassembled state.

[Explanation of symbols]

11 guide light 13 surface emitting device 26 Lighting unit as lighting means 36 Light guide plate 37 Light incident surface 38 Light emitting surface 40 Display panel as guide display 44 Light source holder 45 light source 46 reflector 48,49 Open end 50 light shield

Claims (5)

[Claims] 1. A light guide plate having a light entrance surface and having a light exit surface on the surface side crossing the light entrance surface; a light source for irradiating the light entrance surface of the light guide plate with light; Reflection that is provided in a cross-sectional shape that opens toward the light entrance surface, and that the opening end on the front side located on the front side of the light guide plate is longer than the opening end on the back side located on the back side of the light guide plate. A surface emitting device comprising: a body; and a light source holder that holds a light source and a reflector and is attached and detached from the front surface side of the light guide plate. 2. A light guide plate having a light entrance surface and having a light exit surface on the surface side crossing the light entrance surface; a light source for irradiating the light entrance surface of the light guide plate with light; A reflector provided in a cross-sectional shape that opens toward the light incident surface, and provided at a position where an opening end portion on the front surface side of the light guide plate overlaps the front surface side of the light guide plate; a light source and a reflector And a light source holder that is attached to and detached from the front surface side of the light guide plate. 3. A light guide plate having a light entrance surface and having a light exit surface on the surface side crossing the light entrance surface; a light source for irradiating the light entrance surface of the light guide plate with light; The surface of the light guide plate is provided in a cross-sectional shape that opens toward the light entrance surface, and the opening end on the front surface side of the light guide plate is longer than the opening end on the back surface side of the light guide plate. And a light source holder that holds the light source and the reflector and is attached / detached from the front surface side of the light guide plate;
A surface-emitting device comprising: 4. The opening end on the rear surface side of the reflector is provided at a position shorter than the opening end on the front surface side of the reflector and does not overlap with the front and back surfaces of the light guide plate. 4. The surface emitting device according to claim 1, further comprising a light shield that shields the light from the back surface of the light plate. 5. The surface emitting device according to claim 1, further comprising an inductive display portion provided on the surface of the light guide plate; and a lighting means for lighting a light source. Guide light.