JP2014099355A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device which suppresses an adverse effect in a light distribution characteristic caused by wiring in the long-size lighting device.SOLUTION: When a combination substrate 131 is viewed in a flat plane, the shortest distance between a connection terminal 133a and a connection terminal 133b is set as L0, the shortest distance between a boundary line of the upper surface of the combination substrate 131 and the inner circumferential surface of a first cover 140, and the connection terminal 133a is set as L1, and the shortest distance between a boundary line of the upper surface of the combination substrate 131 and the inner circumferential surface of the first cover 140, and the connection terminal 133b is set as L2. In such a case, the length of a wiring 134 is L0 or more and is (L0+L1+L2) or less.

Description

  The present invention relates to a long lighting device.

In recent years, a long illuminating device in which LEDs (Light Emitting Diodes) are arranged in a row has been proposed. FIG. 14 is an exploded perspective view showing the structure of the illumination device described in Patent Document 1.
The lighting device 900 includes a housing 910, a light emitting module 930, and a translucent cover 940. The light emitting module 930 includes a long rectangular substrate 931 and a linear light source 932 provided on the substrate 931 along the longitudinal direction of the substrate 931. The linear light source 932 includes LEDs 935 arranged in a row. The four light emitting modules 930 are arranged in a row in the longitudinal direction of the housing 910. The translucent cover 940 has a long semi-cylindrical shape and covers the four light emitting modules 930 in common.

JP 2011-150816 A

  By the way, when using several light emitting modules like patent document 1, it is possible to electrically connect adjacent light emitting modules using wiring. That is, connection terminals are provided on the substrates of the light emitting modules, the light emitting modules are arranged in a row in the housing, and then these connection terminals are connected by wiring. In such a case, it is considered that the length of the wiring is set to a length with allowance in consideration of ease of assembly. However, if the length of the wiring is set without taking any consideration into consideration, the surplus wiring will rise from the substrate and become a shadow of the emitted light from the linear light source, which adversely affects the light distribution characteristics. In particular, in the case of a long illuminating device, the width of the translucent cover in the short direction is narrow, so that the space for bypassing the excess wiring inside the translucent cover is limited. The problem becomes noticeable.

  Therefore, the present invention provides a technique for suppressing an adverse effect on light distribution characteristics caused by wiring connecting adjacent substrates in a long lighting device.

  In order to solve the above problems, an illumination device according to the present invention includes a combination board, a first linear light source, a second linear light source, a first connection terminal, a second connection terminal, wiring, And a light cover. The combination substrate includes first and second substrates having a long rectangular shape, and is arranged in a state where the short side of the first substrate and the short side of the second substrate are abutted. The first linear light source is provided on the first substrate along the longitudinal direction of the first substrate. The second linear light source is provided on the second substrate along the longitudinal direction of the second substrate. The first connection terminal is provided beside the first linear light source on the first substrate and is electrically connected to the first linear light source. The second connection terminal is provided on the second substrate at a position facing the first connection terminal across the short side of the second substrate, and is electrically connected to the second linear light source. The wiring electrically connects the first connection terminal and the second connection terminal. The translucent cover has a long semi-cylindrical shape that covers the first and second linear light sources, the first and second connection terminals, and the wiring in common. The translucent cover is disposed so that the longitudinal direction of the translucent cover is along the longitudinal direction of the combined substrate, with the opening of the translucent cover facing the combined substrate. Moreover, the opening width of the translucent cover in the short direction is the same as or smaller than the width of the combined substrate in the short direction. Here, when the combination substrate is viewed in plan, the shortest distance between the first connection terminal and the second connection terminal is L0, and the boundary line between the upper surface of the combination substrate and the inner peripheral surface of the translucent cover and the first L1 is the shortest distance between the connection terminals and L2 is the shortest distance between the boundary line between the upper surface of the combination substrate and the inner peripheral surface of the translucent cover and the second connection terminal. In this case, the length of the wiring is not less than L0 and not more than (L0 + L1 + L2).

The length L0 is the minimum length that can connect the first connection terminal and the second connection terminal. The length (L0 + L1 + L2) is the maximum length when the wiring connecting the first connection terminal and the second connection terminal is detoured in a direction away from the linear light source in a state of being along the upper surface of the combination substrate. That's it.
Since the length of the wiring is L0 or more, the first connecting terminal and the second connecting terminal can be connected using this wiring. Further, since the length of the wiring is (L0 + L1 + L2) or less, it is possible to ensure a state in which the wiring is along the upper surface of the combination substrate. Therefore, it is possible to suppress an adverse effect on the light distribution characteristics due to the wiring connecting adjacent substrates.

The disassembled perspective view of the elongate illuminating device which concerns on embodiment of this invention. Sectional drawing in the longitudinal direction center part of the illuminating device shown in FIG. Partial enlarged view of FIG. Perspective view of the connection part of the light emitting module Top view of the same part as FIG. Top view for explaining the dimensional relationship of the connection part of the light emitting module Side view of the light emitting module in the case of FIG. Top view for explaining the dimensional relationship of the connection part of the light emitting module Side view of the light emitting module in the case of FIG. Top view for explaining the dimensional relationship of the connection part of the light emitting module Side view of the light emitting module in the case of FIG. Top view for explaining the dimensional relationship of the connection part of the light emitting module The side view of the light emitting module in the case of FIG. The exploded perspective view which shows the structure of the illuminating device described in patent document 1

DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described in detail with reference to the drawings.
<1> Schematic Configuration FIG. 1 is an exploded perspective view of a long lighting device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the central portion in the longitudinal direction of the lighting device, and FIG. 3 is an enlarged view of a portion A in FIG.
The lighting device 100 includes a housing 110, a base 120, light emitting modules 130a and 130b, a first cover 140, and a second cover 150.

  The casing 110 is a long container having an upper surface opened and is made of a metal material or a resin material. A lighting unit (not shown), a heat transfer plate 111 and a support plate 112 are accommodated in the housing 110. The lighting unit converts AC power from a commercial power source into DC power for lighting the light emitting module. The heat transfer plate 111 covers the upper surface side of the lighting unit, and efficiently transfers the heat radiated from the lighting unit to the housing 110. The heat transfer plate 111 has a screw hole 111 a for screwing the base 120. The support plates 112 are provided at both ends in the longitudinal direction in the housing 110 and have screw holes 112 a for screwing the second cover 150.

  The base 120 has a long rectangular main surface portion 121 and leg portions 122 provided on both sides of the main surface portion 121 in the short direction. The base 120 can be formed, for example, by bending both sides in the short direction of a long rectangular metal plate. The main surface 121 has a screw hole 121a for screwing the light emitting modules 130a and 130b and a screw hole 121b for screwing the first cover 140. The leg portion 122 has an insertion hole 122a for inserting a screw when the base 120 is screwed to the support plate 112.

  The light emitting module 130a includes a substrate 131a, a linear light source 132a, and a connection terminal 133a. The substrate 131a has a long rectangular shape. For example, a ceramic substrate, a glass epoxy substrate, or a metal substrate on which an insulating film such as ceramics or resin is formed can be used. The linear light source 132a is provided on the substrate 131a along the longitudinal direction of the substrate 131a. The linear light source 132a includes 20 LEDs 135a in the present embodiment. The LEDs 135a are arranged in a row apart from each other, and are electrically connected in series using a wiring pattern (not shown) provided on the substrate 131a. As the LED 135a, for example, a white LED can be used. As the white LED, for example, a combination of a blue LED and a yellow phosphor, a combination of a blue LED, a green phosphor, and a red phosphor can be used. The connection terminal 133a is provided beside the linear light source 132a on the substrate 131a, and is electrically connected to the linear light source 132a using a wiring pattern (not shown) provided on the substrate 131a.

  The light emitting module 130b includes a substrate 131b, a linear light source 132b, and a connection terminal 133b. Since each structure of the light emitting module 130b is the same as each structure of the light emitting module 130b, description thereof is omitted. The light emitting modules 130a and 130b are arranged on the base 120 in a state where the short side of the substrate 131a and the short side of the substrate 131b are abutted. Hereinafter, a set of the substrate 131a and the substrate 131b may be referred to as a “combination substrate 131”. In a state where the light emitting modules 130a and 130b are arranged on the base 120, the connection terminal 133b is in a position facing the connection terminal 133a across the short side of the substrate 131b. The connection terminal 133a and the connection terminal 133b are electrically connected through the wiring 134.

  The first cover 140 is a cover that covers the linear light sources 132a and 132b, the connection terminals 133a and 133b, and the wiring 134 in common, and is made of a translucent material such as resin or glass. The first cover 140 has a long half-cylinder part 141 whose bottom surface side is open, and a flange part 142 provided on the bottom surface side of the half-cylinder part 141. The half-cylinder part 141 has a shape obtained by dividing a long cylinder in the longitudinal direction. The linear light sources 132a and 132b, the connection terminals 133a and 133b, and the wiring 134 can be accommodated in the space inside the half cylinder portion 141. The flange portion 142 has an insertion hole 143 for inserting a screw when the first cover 140 is screwed to the base 120. In FIG. 1, a screw is inserted into the insertion hole 143. The first cover 140 is disposed on the base 120 so that the longitudinal direction of the semi-cylindrical portion 141 is along the longitudinal direction of the combination substrate 131 with the opening of the semi-cylindrical portion 141 facing the combination substrate 131, and the flange portion 142. The base 120 is screwed using a screw inserted into the insertion hole 143. A packing 161 is sandwiched between the lower surface of the flange portion 142 and the upper surface of the base 120. As shown in FIG. 2, a groove 144 for positioning the packing 161 is provided on the lower surface of the flange portion 142. The depth of the groove 144 is smaller than the diameter of the packing 161. By providing the packing 161, it is possible to suppress moisture and the like from entering the internal space formed by the first cover 140 and the base 120. Further, as shown in FIG. 3, the opening width W <b> 2 in the short direction of the semi-cylindrical portion 141 is smaller than the width W <b> 1 in the short direction of the combination substrate 131. Therefore, both sides of the upper surface of the combination substrate 131 in the short direction come into contact with the lower surface of the first cover 140. Specifically, notches 145 are provided on both sides of the opening on the lower surface of the flange portion 142. The depth of the notch 145 is the same as or smaller than the thickness of the combination substrate 131. Thereby, when the first cover 140 is screwed to the base 120, the lower surface of the flange portion 142 presses the upper surface of the combination substrate 131 toward the base 120. Therefore, the lower surface of the combination substrate 131 can be brought into close contact with the upper surface of the base 120, and the thermal contact between the combination substrate 131 and the base 120 can be improved.

  The half cylinder portion 141 may be provided with an optical function for optically controlling the light emitted from the linear light sources 132a and 132b. Optical functions include, for example, a lens function for controlling light distribution, a light diffusion function for suppressing luminance unevenness, a light wavelength conversion function for converting the wavelength of emitted light, and a reduction in a specific wavelength component of emitted light. Such as a filter function. Further, these functions may be combined.

  The second cover 150 is a cover that closes the opening on the upper surface side of the housing 110, and is made of a translucent material such as resin or glass. The second cover 150 includes a long half-cylinder part 151 having an open lower surface side, and a flange part 152 provided on the lower surface side of the half-cylinder part. The half cylinder portion 151 has a shape obtained by dividing a long rectangular tube in the longitudinal direction. Similarly to the half tube portion 141, the half tube portion 151 may be provided with an optical function. The flange portion 152 has an insertion hole 153 for inserting a screw when the second cover 150 is screwed to the housing 110. In FIG. 1, a screw is inserted into the insertion hole 153. A packing 162 is sandwiched between the lower surface of the flange portion 152 and the upper surface of the base 120. As shown in FIG. 2, a groove 154 for accommodating the packing 162 is provided on the lower surface of the flange portion 152. By providing the packing 162, it is possible to suppress moisture and the like from entering the internal space formed by the second cover 150 and the housing 110.

<2> Structure of Wiring and Connection Terminal FIG. 4 is a perspective view of a connection portion of the light emitting module, and FIG. 5 is a top view of the same portion as FIG. The wiring 134 includes connectors 134a and 134b and a covered wire 134c. The covered wire 134c is obtained by coating the outer peripheral surface of a metal wire with an insulating film. Connectors 134a and 134b are connected to both ends of the covered wire 134c, respectively. The connection terminals 133a and 133b are connector receiving portions adapted to the connectors 134a and 134b, respectively. The connection terminals 133a and 133b are provided with receptacles 136a and 136b for receiving the connectors 134a and 134b, respectively. The connectors 134a and 134b are inserted into the receptacles 136a and 136b of the connection terminals 133a and 133b, respectively, so that the connection terminal 133a and the connection terminal 133b are electrically connected through the wiring 134. By using the connector in this way, the assembly process can be simplified compared to the case of soldering. The connection terminals 133a and 133b are arranged such that the receiving ports 136a and 136b face each other in a state where the light emitting modules 130a and 130b are fixed to the base 120. Therefore, the direction of insertion of the connector 134a into the connection terminal 133a is opposite to the direction of insertion of the connector 134b into the connection terminal 133b. Thus, the length of the wiring 134 can be shortened by making the receiving openings 136a and 136b face each other. In FIG. 5, broken lines 131 c and 131 d indicate boundary lines between the upper surface of the combination substrate 131 and the inner peripheral surface of the first cover 140, respectively. In other words, there is a space between the semi-cylindrical portion 141 of the first cover 140 and the combination substrate 131 on the inner side between the boundary lines 131c and 131d. On the other hand, outside of the boundary lines 131c and 131d, the lower surface of the flange portion 142 of the first cover 140 and the upper surface of the combination substrate 131 are in contact.

<3> Length of Wiring FIG. 6 is a top view for explaining the dimensional relationship of the connection portion of the light emitting module. L0 is the shortest distance between the connection terminal 133a and the connection terminal 133b. L1 is the shortest distance between the connection line 133a and the boundary line 131c between the upper surface of the combination substrate 131 and the inner peripheral surface of the first cover 140. L2 is the shortest distance between the connection line 133b and the boundary line 131c between the upper surface of the combination substrate 131 and the inner peripheral surface of the first cover 140. In the present embodiment, the length of the wiring 134 is set within the range of L0 or more and (L0 + L1 + L2) or less. L0 is the minimum length with which the connection terminal 133a and the connection terminal 133b can be connected by the wiring 134. In addition, (L0 + L1 + L2) is the maximum when the wiring 134 that connects the connection terminal 133a and the connection terminal 133b is detoured in a direction away from the linear light sources 132a and 132b along the upper surface of the combination substrate 131. Length. Since the length of the wiring 134 is L0 or more, the connection terminal 133a and the connection terminal 133b can be connected using the wiring 134. In addition, since the length of the wiring 134 is equal to or shorter than (L0 + L1 + L2), it is possible to ensure a state where the wiring 134 is along the upper surface of the combination substrate 131. Within this range, the wiring 134 can be along the upper surface of the combination substrate 131, so that it is possible to prevent the wiring 134 from adversely affecting the light distribution characteristics. Hereinafter, it demonstrates in detail using FIGS. 6-13.

  In FIG. 6, the length of the wiring 134 is L0. Since the length of the wiring 134 and the shortest distance between the connection terminals 133a and 133b are the same, there is no surplus in the wiring 134 in a state where the wiring 134 is connected to the connection terminals 133a and 133b. At this time, the wiring 134 is along the upper surface of the combination substrate 131 (see the side view of FIG. 7). By having the wiring 134 along the upper surface of the combination substrate 131 in this way, it is possible to suppress an adverse effect on the light distribution characteristics as compared with the case where the wiring 134 is lifted from the upper surface of the combination substrate 131.

  In FIG. 8, the length of the wiring 134 is (L0 + L1 + L2). In this example, when the wiring 134 is connected to the connection terminals 133a and 133b, a surplus is generated in the wiring 134 by the length of (L1 + L2). However, by detouring the wiring 134 in a direction away from the linear light sources 132a and 132b, a state in which the wiring 134 is along the upper surface of the combination substrate 131 can be secured (see the side view of FIG. 9). Therefore, similarly to the example of FIG. 6, it is possible to make it difficult to adversely affect the light distribution characteristics as compared with the case where the wiring 134 is lifted from the upper surface of the combination substrate 131. In addition, by detouring the wiring 134 in the direction away from the linear light sources 132a and 132b as in the example of FIG. 8, it is possible to suppress adverse effects on the light distribution characteristics due to the height (diameter) of the wiring 134 itself. can do.

  In FIG. 10, the length of the wiring 134 is longer than L0 and shorter than (L0 + L1 + L2), and is a length that allows the wiring 134 to pass through the point P. Point P is an intersection of the short side of each of the substrates 131a and 131b and the boundary line 131c. In this example, the wiring 134 is bent in a natural shape while the wiring 134 is kept along the upper surface of the combination substrate 131 (see the side view of FIG. 11) and the wiring 134 is detoured to some extent. it can. Therefore, it is possible to suppress an adverse effect on the light distribution characteristics, and it is possible to prevent the characteristic deterioration due to the bending of the wiring 134. When L1 and L2 have the same length, the wiring 134 can pass through the point P if the length of the wiring 134 is not less than √ (L0 ^ 2 + (2 × L1) ^ 2).

  In FIG. 12, the length of the wiring 134 is longer than (L0 + L1 + L2). In this example, a surplus longer than (L1 + L2) is generated in the wiring 134 in a state where the wiring 134 is connected to the connection terminals 133a and 133b. In this case, since the surplus portion of the wiring 134 is too long, it is difficult to ensure that the wiring 134 is along the upper surface of the combination substrate 131. As a result, the wiring 134 floats from the upper surface of the combination substrate 131 (see the side view arrow in FIG. 13), and the light distribution characteristics are adversely affected.

  As described above, when the length of the wiring 134 is set to L0 or more and (L0 + L1 + L2) or less, the wiring 134 has an adverse effect on the light distribution characteristics while connecting the connection terminal 133a and the connection terminal 133b using the wiring 134. Is suppressed. Further, if the length of the wiring 134 is set to √ (L0 ^ 2 + (2 × L1) ^ 2) or more, the adverse effect on the light distribution characteristics due to the height (diameter) of the wiring 134 itself can be suppressed. can do.

<4> Positional Relationship of Connection Terminals Next, returning to FIGS. 4 and 5, the positional relationship of the connection terminals will be described. Each of the connection terminals 133a and 133b is a connector receiving portion and has a certain height. Therefore, there is a possibility that the light distribution characteristics may be adversely affected due to the height of the connection terminals 133a and 133b themselves. In particular, the problem becomes significant when the height of the connector receiving portion is higher than the height of the LEDs 135a and 135b. Therefore, in the present embodiment, the connection terminal 133a is positioned so as not to overlap any LED 135a in the short direction of the substrate 131a. Similarly, the connection terminal 133b is any LED 135b in the short direction of the substrate 131b. It is located so as not to overlap. Thereby, compared with the case where connection terminal 133a, 133b overlaps LED135a, 135b in a transversal direction, it can suppress that a bad influence arises in the light distribution characteristic resulting from the height of connection terminal 133a, 133b itself. .

<5> Dimensional Relationship of Light Emitting Module Next, returning to FIG. 6, a specific dimensional relationship of the light emitting module will be described. Note that the following dimensions are merely examples, and the present embodiment is not limited to these dimensions.
The width W1 in the short direction of the combination substrate 131 is 24.5 mm or more and 25.5 mm or less, and 25.0 mm in the present embodiment. The opening width W2 of the first cover 140 is 22.8 mm or more and 23.2 mm or less, and 23.0 mm in this embodiment. The shortest distance L0 between the connection terminals 133a and 133b is 44.3 mm or more and 44.9 mm or less, and is 44.6 mm in this embodiment. The shortest distance L1 between the boundary line 131c between the upper surface of the combination substrate 131 and the inner peripheral surface of the first cover 140 and the connection terminal 133a is 3.9 mm or more and 4.5 mm or less, and in this embodiment, 4.2 mm. It is. The shortest distance L2 between the boundary line 131c between the upper surface of the combination substrate 131 and the inner peripheral surface of the first cover 140 and the connection terminal 133b is 3.9 mm or more and 4.5 mm or less, and in this embodiment, 4.2 mm. It is. The shortest distance L3 between the connection terminal 133a and the linear light source 132a is not less than 5.4 mm and not more than 6.0 mm, and is 5.7 mm in this embodiment. The shortest distance L4 between the connection terminal 133b and the linear light source 132b is 5.4 mm or more and 6.0 mm or less, and is 5.7 mm in this embodiment. The chip dimension W3 of the LEDs 135a and 135b is not less than 2.8 mm and not more than 3.2 mm, and is 3.0 mm in this embodiment. The arrangement pitch L5 of the LEDs 135a and 135b is 11.8 mm or more and 12.2 mm or less, and 12.0 mm in this embodiment. The length L6 in the longitudinal direction of the connection terminals 133a and 133b is not less than 5.2 mm and not more than 5.6 mm, and in this embodiment is 5.4 mm. The length L7 of the portion where the connectors 134a and 134b protrude from the connection terminals 133a and 133b in a state where the connectors 134a and 134b are connected to the connection terminals 133a and 133b is 3.0 mm or more and 3.4 mm or less. Then, it is 3.2 mm.

<6> Modifications Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment. For example, there are the following modifications.
(1) Form of connection terminal and wiring In the embodiment, the wiring is connected using the connector, but the present invention is not limited to this. For example, the wiring may be connected using soldering. In this case, the connection terminal is not a connector receiving portion but a land for soldering. Further, the structures of the connector and the connector receiving portion are not limited to those shown in the embodiment, and any form is applicable.

(2) Shape of the first cover In the embodiment, the shape of the half cylinder portion of the first cover is such a shape that the cylinder is divided in half, but the present invention is not limited to this. For example, a shape in which a square tube is divided in half may be used.
In the embodiment, the combination substrate is pressed by the first cover by making the opening width on the lower surface side of the first cover smaller than the width of the combination substrate in the short direction. However, the present invention is not limited to this, and the opening width on the lower surface side of the first cover may be the same as the width in the short direction of the combination substrate.

(3) Multiple Cover In the embodiment, the multiple cover of the first cover and the second cover is used, but the present invention is not limited to this. At least the first cover may be provided, and the second cover may be provided as necessary.
(4) Quantity of light emitting modules In the embodiment, the number of light emitting modules is two, but the present invention is not limited to this. Three or more may be sufficient.

(5) Linear light source In the embodiment, the linear light source is configured by arranging a plurality of LEDs in a line, but the present invention is not limited to this. For example, the linear light source may be composed of a cold cathode lamp or the like.
(6) Quantity of wiring In the embodiment, the wiring is provided only on one side of the combination board in the short direction, but the present invention is not limited to this. For example, wirings may be provided in both the short sides of the combination board.

DESCRIPTION OF SYMBOLS 100 Illumination device 110 Housing | casing 111 Heat-transfer plate 111a Screw hole 112 Support plate 112a Screw hole 120 Base 121 Main surface part 121a Screw hole 121b Screw hole 122 Leg part 122a Insertion hole 130a, 130b Light emitting module 131 Combination board 131a, 131b Board 132a , 132b Linear light source 133a, 133b Connection terminal 134 Wiring 134a, 134b Connector 134c Covered wire 135a, 135b LED
136a, 136b Receiving port 140 First cover 141 Half cylinder part 142 Flange part 143 Insertion hole 144 Groove 150 Second cover 151 Half cylinder part 152 Flange part 153 Insertion hole 161 Packing 162 Packing

Claims (5)

A combination board including a long rectangular first and second substrates and arranged in a state in which a short side of the first substrate and a short side of the second substrate are abutted;
A first linear light source provided on the first substrate along the longitudinal direction of the first substrate;
A second linear light source provided on the second substrate along the longitudinal direction of the second substrate;
A first connection terminal provided on a side of the first linear light source on the first substrate and electrically connected to the first linear light source;
A second connection terminal provided on the second substrate at a position facing the first connection terminal across the short side of the second substrate and electrically connected to the second linear light source; ,
Wiring for electrically connecting the first connection terminal and the second connection terminal;
A long semi-cylindrical translucent cover that covers the first and second linear light sources, the first and second connection terminals, and the wiring in common,
The translucent cover is arranged such that the longitudinal direction of the translucent cover is along the longitudinal direction of the combination substrate, with the opening of the translucent cover facing the combination substrate.
An opening width in the short direction of the translucent cover is equal to or smaller than a width in the short direction of the combination substrate,
In a plan view of the combination substrate,
The shortest distance between the first connection terminal and the second connection terminal is L0,
L1 is the shortest distance between the boundary line between the upper surface of the combination substrate and the inner peripheral surface of the translucent cover and the first connection terminal;
When the shortest distance between the boundary line between the upper surface of the combination substrate and the inner peripheral surface of the translucent cover and the second connection terminal is L2,
The length of the said wiring is L0 or more and is (L0 + L1 + L2) or less. The illuminating device characterized by the above-mentioned. L1 and L2 are the same,
The lighting device according to claim 1, wherein a length of the wiring is not less than √ (L0 ^ 2 + (2 × L1) ^ 2). The wiring includes a covered wire and connectors provided at both ends of the covered wire,
The first connection terminal is a first connector receiving portion that fits into one connector of the wiring,
The lighting device according to claim 1, wherein the second connection terminal is a second connector receiving portion adapted to the other connector of the wiring. The receiving port of the first connector receiving part and the receiving port of the second connector receiving part are opposed to each other;
The direction of insertion of the one connector of the wiring into the first connector receiving portion and the direction of insertion of the other connector of the wiring into the second connector receiving portion are opposite directions. Item 3. The lighting device according to Item 2. Each of the first and second linear light sources is arranged in a row with a plurality of light emitting elements spaced apart from each other,
2. The lighting device according to claim 1, wherein the first and second connection terminals are positioned so as not to overlap any light emitting element in a short direction of the first and second substrates, respectively. .

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