JP7255783B2 - Optical unit and LED lighting equipment for street lighting using the optical unit - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies.

The present invention relates to an LED lighting fixture for street lights attached to a post or the like, and an optical unit used therein.

Street lights using LEDs (laser light emitting diodes) are designed to save power while illuminating a wide range of roadways. For example, in the LED lighting device of Patent Literature 1, an angle changing section is attached to a lighting unit in which a hemispherical lens is attached to an LED in a lighting fixture. The angle changing portion directs the illumination light in various angular directions.

JP 2008-258007 A

However, changing the angle of the lighting unit while checking the actual illuminated state is a laborious task. In addition, when the angles of a plurality of lighting units are changed so that bright areas and dark areas coexist, the glare becomes uncomfortable for pedestrians. There is also a problem that the amount of light emitted from the LED cannot be effectively used.

Accordingly, in order to solve the above problems, the present invention provides an optical unit capable of efficiently irradiating an effective luminous flux. Another object of the present invention is to provide an LED lighting fixture for street lighting using the optical member.

This embodiment is an optical unit that includes a transparent optical member made of a transparent material and a reflective optical member that is arranged over the transparent optical member and made of a reflective material. The transparent optical member of the optical unit includes a concave portion recessed to accommodate the LED, a first outer shell formed in a hemispherical shape with respect to the optical axis of the LED on the opposite side of the concave portion, and a hemispherical shape. a second outer shell formed at the first edge and formed higher than the first outer shell; Also, the reflecting optical member of the optical unit has a frame portion having an opening the size of the first shell portion in a plan view, and side walls rising from the frame portion and adjacent to side surfaces of the second shell portion. The light from the LED is guided in a predetermined direction by the transparent optical member and the reflective optical member.

In addition, the cross section of the transparent optical member of the embodiment has a thin thickness from the recess to the first outer shell in the direction of the first edge, and a recess in the direction of the second edge opposite to the first edge. It is preferable that the thickness from the part to the first outer shell part is formed thick. Moreover, it is preferable that the hemisphere includes an elliptical shape or a track shape in a plan view, and the longitudinal direction of the elliptical shape or the track shape is in contact with the first edge. Moreover, it is preferable that the diameter of the concave portion of the transparent optical member is the same as the width of the second outer shell.

Preferably, the reflecting optical member has a ceiling wall covering the roof surface of the second outer shell from the side walls. Side walls of the reflective optical member are preferably curved.

When the LEDs are arranged on the substrate in N (N is a natural number of 1 or more) rows and M (M is a natural number of 2 or more) columns, the transparent optical member is formed in N rows and M columns on one transparent flat plate. , the reflective optical members are preferably formed in N rows and M columns on a single reflecting flat plate.

This embodiment is an LED lighting fixture for street lighting that is fixed to an outdoor wall or pillar. The LED lighting fixture includes a substrate on which LEDs are arranged, an optical unit arranged over the substrate, and a waterproof cover that covers and waterproofs the optical unit. The optical unit has the second outer shell portion disposed on the side of the wall or the pillar.

The optical unit of the present invention can irradiate an efficient effective luminous flux. The same applies to LED lighting equipment using the optical unit.

1 is a perspective view of an LED lighting fixture for street lighting; FIG. 1 is a block diagram of an LED lighting fixture for street lighting; FIG. (a) is a cross-sectional view of the illumination unit cut in the Y-axis direction, and (b) is a cross-sectional view taken along line BB of (a). (a) is an enlarged cross-sectional view of the transparent optical member cut in the Y-axis direction, and (b) is an enlarged cross-sectional view of the transparent optical member cut in the X-axis direction. (a) is an overall plan view of the transparent optical member viewed from the -Z axis direction, (b) is an overall side view viewed from the +Y axis direction, and (c) is an overall side view viewed from the +X axis direction. It is an expansion perspective view of a reflective optical member. (a) is an overall plan view of the reflecting optical member viewed from the -Z axis direction, (b) is an overall side view viewed from the +Y axis direction, and (c) is an overall side view viewed from the +X axis direction.

An LED lighting fixture for street lighting according to an embodiment of the present invention will be described. In the following embodiments, LED lighting fixtures will be described as LED lighting fixtures for street lights arranged on public roads, highways, or the like. Each drawing used for explanation is schematically shown to the extent that these inventions can be understood, and the size, angle, thickness, etc. are exaggerated. In addition, in each drawing used for explanation, the same component may be denoted by the same number, and the explanation thereof may be omitted.

<Overview of LED lighting equipment>
The LED lighting fixture 100 for street lights is attached to an outdoor wall or a pillar and serves as a street light that illuminates a general road or the like. The LED lighting fixtures 100 are arranged, for example, at intervals of 40 to 60 m on a 6 m wide road. As shown in FIG. 1, an LED lighting fixture 100 for street lighting includes a lighting unit 10 arranged below the main body cover 95 (−Z axis side) and a control unit arranged below the main body cover 95. 20, a solar panel 30 (see FIG. 2) for photovoltaic power generation arranged on the upper side (+Z axis side) of the main body cover 95, a surveillance camera 50 arranged on the lower side of the main body cover 95, and a LoRa antenna. 60. The housing of the control unit 20 is provided with an angle adjuster 90 that changes the inclination of the body cover 95 with respect to the support. The main body cover 95 is made of aluminum alloy or the like so as to withstand wind and rain.

Further, the LED lighting fixture 100 for street lighting has a photoresistor CDS whose electric resistance decreases as the amount of light increases, and a human sensor HDS for detecting the approach and location of a person, etc., on the underside of the main body cover 95. ing. The LED lighting fixture 100 is fixed to a post (not shown) or a wall via an angle adjuster 90 provided on the housing of the control unit 20 . It is preferable that the column or the wall be constructed such that an electric wire for AC 100V (the external power supply AC in FIG. 2) can be inserted thereinto.

One lighting unit 10 has a power consumption of 15 W, for example, and employs, for example, an LED light control section 27 (see FIG. 2) capable of three-step light control. In FIG. 1, two lighting units 10 are arranged to provide illumination of 30 W, but depending on the installation area and application, the number of lighting units 10 may be one (15 W) or three or more (45 W, 60 W ...). You may The lighting unit 10 is configured to illuminate forward (+X-axis direction) and downward (-Z-axis direction) with reference to an angle adjusting portion 90 attached to a support. Even if the angle adjuster 90 described above is attached at 90 degrees to the support, most of the light emitted from the lighting unit 10 is directed forward (+X axis direction) with respect to the support, and the light is directed backward (- X-axis direction) does not reach much. Note that FIG. 1 illustrates the lighting unit 10 with the waterproof cover removed.

The monitoring camera 50 is, for example, a 10-megapixel digital camera having a wide-angle lens inside a hemispherical waterproof cover. The monitoring camera 50 regularly captures still images and moving images. Still images or moving images are acquired as digital data. In addition, the monitoring camera 50 may transmit images to the base station via the control unit 21 and the communication unit 29 (see FIG. 2), or store the images in an internal storage medium (not shown). good too. The street light LED lighting fixture 100 may be equipped with a crime prevention red light or an alarm buzzer that rotates based on the image of the surveillance camera 50 as crime prevention equipment.

The LoRa antenna 60 is an antenna used when communicating with a base station using LPWAN (Low Power Wide Area Network) technology. “LPWAN” is a technology that enables wide-area wireless communication with low power consumption, and LoRa communication is a type of transmission technology of the LPWAN technology. The LoRa antenna 60 can wirelessly transmit an image or the like captured by the surveillance camera 50 to the base station. Although LoRa communication is assumed in the present embodiment, the communication method is not limited to this, and may be wired communication.

Photoresistor CDS detects external brightness and outputs the signal. Although the photoresistor CDS is arranged on the front side (+X axis side) of the illumination unit 10 in FIG. 1, it may be arranged on the rear side (−X axis side).

The human sensor HDS uses ultrasonic waves and infrared rays to sense the approach and location of humans and the like. Although the human sensor HDS is arranged on the front side (+X axis side) of the lighting unit 10 in FIG. 1, it may be arranged on the rear side (−X axis side) of the lighting unit 10. The human sensor HDS may be attached to any position on the main body cover 95 as long as it is a position where it is easy to detect a person or the like.

A solar panel 30 (not shown) on the upper side (+Z-axis side) of the body cover 95 includes a solar cell module in which a plurality of cells are arranged in parallel on the panel surface. The solar cell module preferably adopts a double-sided solar cell module in which cells are provided on both sides of the panel, but the solar cell module may be a single-sided solar cell module in which cells are provided on one side of the panel.

<Overview of control unit>
Next, the control unit 20 will be explained using FIG. FIG. 2 is a block diagram of an LED lighting fixture for street lighting, and in FIG. The control unit 20 has a main control section 21, a solar charging circuit 23, an AC/DC charging circuit 25, an LED dimming section 27, a communication section 29, a battery BAT, and the like. In FIG. 2, double lines indicate power lines for supplying power, and solid lines indicate signal lines for transmitting and receiving signals such as commands or data. Note that the LED dimming section 27 may be provided on the circuit board of the illumination unit 10 instead of inside the control unit 20 .

The main control unit 21 receives signals from the photo-resistor CDS and the human sensor HDS, as indicated by solid signal lines. The main control unit 21 also transmits and receives signals or data to and from the solar charging circuit 23 , the AC/DC charging circuit 25 , the LED dimming unit 27 , the communication unit 29 and the monitoring camera 50 .

A lead battery, a lithium ion battery, a solid battery, or the like can be applied to the battery BAT, and the lithium ion battery is used in this embodiment. As indicated by the double line power line, the battery BAT is charged by the solar panel 30 or the external power supply AC and supplies power to the main control unit 21 and the like.
The solar charging circuit 23 charges the battery BAT so that the battery BAT is always fully charged during normal times when there is no power failure. Instead of always charging the battery BAT to full charge, when the amount of charge in the battery BAT becomes equal to or less than a certain value, the supply of electricity may be started and the battery may be charged to full charge. The solar charging circuit 23 receives a signal from the main control unit 21 and charges the battery with the power supplied from the solar panel 30 prior to the external power supply AC. When the output voltage generated by the solar panel 30 rises as the amount of solar radiation increases and the output voltage reaches the charging allowable voltage of the battery BAT, the solar charging circuit 23 disconnects the circuit of the battery BAT and charges the battery BAT. or the battery BAT is de-energized by shorting its circuit. On the other hand, the surveillance camera 50, the communication unit 29, etc. are in operation, and the voltage of the battery BAT gradually decreases due to these DC loads. 23 resumes charging the battery BAT.

The external power supply AC is a commercial power supply of AC 100V, and when the current obtained from the solar panel is small and the charging capacity of the battery BAT is small, the battery BAT is charged from the external power supply AC. In particular, when the capacity of the battery BAT is large, or when the capacity of the battery BAT is small and there is little problem, the AC/DC circuit 25 is unnecessary and the battery BAT does not need to be charged from the external power supply AC.

The AC/DC circuit 25 is a circuit that converts AC 100V to DC. The AC/DC circuit 25 also receives a signal from the main control unit 21 and charges the battery BAT when the amount of charge from the solar panel 30 is low and the capacity of the battery BAT is less than a predetermined value.

The photoresistor CDS sends an external brightness signal to the main controller 21 . Based on the signal, the main control unit 21 can send a signal to the LED light control unit 27 to automatically turn on the lighting unit 10 when the outside becomes dark and to automatically turn off the light when the outside becomes bright.

The human sensor HDS transmits to the main control unit 21 a signal indicating the approach of a human or the like. Based on the sensing signal, the main control section 21 can transmit a signal for adjusting the brightness of the lighting unit 10 to make it brighter to the LED dimming section 27 . In addition, the main control unit 21 can transmit a signal for increasing the number of captured still images or a signal for changing a still image to a moving image to the monitoring camera 50 according to the sensing signal.

The LED dimming section 27 can dim the brightness of the lighting unit 10 . Based on a signal from the main control unit 21, for example, it is possible to perform dimming in two steps, three steps, four steps, etc. according to the brightness of the outside, the time zone, or the remaining amount of the battery.

The monitoring camera 50 can image-compress captured still images or moving images in formats such as JPEG and MXcodec. The monitoring camera 50 can also store compressed image data in a storage device such as a memory. The monitoring camera 50 may also have an AI (artificial intelligence) function, and can detect whether or not luggage is left unattended. It should be noted that not all image compression and the like may be performed by the monitoring camera 50, but part or all of them may be performed by the main control unit 21. FIG. Further, in response to an instruction from a base station (not shown), the main control unit 21 may also transmit a signal to the monitoring camera 50 to change the still image shooting cycle or change from a still image to a moving image or vice versa. good.

The communication unit 29 communicates with a base station such as a cloud or on-premises server using the LoRa antenna 60 . Signals such as the illumination state of the lighting unit 10 can be transmitted, and images captured by the LED monitoring camera 50 can be wirelessly transmitted to the base station. The communication unit 29 can also receive a command signal or the like from the base station and transmit the command signal to the main control unit 21 .

<Configuration of lighting unit 10>
The lighting unit 10 will be described below with reference to FIG.

FIG. 3A is a cross-sectional view of the lighting unit 10 cut in the Y-axis direction passing through the LED element 125. FIG. FIG. 3B is a cross-sectional view taken along line BB of FIG. 3A, which is a cross-sectional view of the lighting unit 10 cut in the X-axis direction passing through the LED element 125. FIG. The illumination unit 10 is provided with a radiator plate 110, an LED substrate 120, a transparent optical member 130, a reflective optical member 140, and a waterproof cover 150 stacked in order from the +Z-axis side to the −Z-axis direction. In this embodiment, the transparent optical member 130 and the reflective optical member 140 constitute an optical unit. On the LED substrate 120, ten LEDs 125 sealed with a sealing resin or the like are mounted on LED mounting terminals 126. As shown in FIG. Regarding the shape of the LED mounting terminal 126 and the LED 125, as shown in FIG. Alternatively, it may have a shape that does not protrude in the −Z-axis direction.

The radiator plate 110 is made of die-cast aluminum or the like and has a plurality of fins. The LED substrate 120 has 10 LEDs 125 arranged in 5 rows×2 columns, for example. The transparent optical member 130 is preferably made of transparent glass or transparent plastic (polycarbonate, acrylic (PMMA), etc.). One transparent optical member 130 having ten lenses 131 is provided for ten LEDs 125 . However, one transparent optical member 130 consisting of only one lens 131 may be arranged for one LED 125 . The reflective optical member 140 may be an aluminum die-cast having a mirror surface, or may be a plastic resin plated with nickel or the like. One reflecting optical member 140 having ten reflecting mirrors 141 is provided for ten LEDs 125 . However, one reflective optical member 140 consisting of only one reflecting mirror 141 may be arranged for one LED 125 . The waterproof cover 150 is preferably made of transparent glass or transparent plastic (such as polycarbonate or acrylic (PMMA)). In particular, the waterproof cover 150 preferably seals the LED substrate 120 with rubber packing or an O-ring.

As shown in FIG. 3B, the LED substrate 120, the transparent optical member 130, and the reflective optical member 140 each have a hole HL, and are fastened with fastening portions SC such as screws after being positioned. . The transparent optical member 130 and the reflective optical member 140 emit radial light emitted from the LED element 125 centering on the −Z axis direction forward (+X axis direction) with respect to the −Z axis. Its forward tilt angle is about 5 to 40 degrees with respect to the -Z axis. In other words, the transparent optical member 130 and the reflective optical member 140, which are optical units, prevent the radial light emitted from the LED element 125 from being emitted backward (in the -X-axis direction) with respect to the -Z-axis.

<Overview of transparent optical member>
The transparent optical member 130 of this embodiment has ten lenses 131 . The transparent optical member 130 will be described in detail with reference to FIGS. 4 and 5. FIG. FIG. 4A is an enlarged sectional view of one lens 131 of the transparent optical member 130 cut in the Y-axis direction. (b) is an enlarged cross-sectional view of one lens 131 of the transparent optical member 130 cut in the X-axis direction.

As shown in FIG. 4(a), a first recess 132 and a second recess 133 for accommodating the LED 125 (FIG. 3) mounted on the LED substrate 120 in the lens 131 are formed hollow. . The first recessed portion 132 has a circular or elliptical shape when viewed from the Z-axis side, and the second recessed portion 133 has a circular, elliptical or rectangular shape when viewed from the Z-axis side. Since the second recessed portion 133 is recessed for the LED mounting terminals 126 protruding from the LED substrate 120 in the −Z-axis direction, the second recessed portions 133 may be omitted if the LED mounting terminals 126 do not protrude from the LED substrate 120 . .

In addition, the lens 131 has a first outer shell 136, and when viewed from the X-axis direction, the first outer shell 136 is an elliptical or track-shaped outer circumference that is half. That is, the first outer shell 136 has an outer circumference 136a with a short diameter and an outer circumference 136b with a long diameter. The first outer shell 136 having such an elliptical shape or an outer circumference obtained by halving a track shape makes it easier for the light emitted from the LED 125 to spread in the Y-axis direction. Since the LED lighting fixture 100 for street lighting is arranged on one side of a road width of 6 m, for example, it suffices to brightly illuminate about 6 m in the X-axis direction. Since the LED lighting fixtures 100 for street lighting are arranged at intervals of 40 to 60 m, it is preferable that one LED lighting fixture 100 can brightly illuminate 20 m or more in the direction in which the road extends (Y-axis direction). The lens 131 having the first contour 136 makes it easier to irradiate light in the Y-axis direction.

As shown in FIG. 4B, the first recessed portion 132 has different recess depths on the +X axis side and on the -X axis side. , the recess 132b is deep. A first outer shell 136 of the lens 131 is substantially circular when viewed from the -Y axis direction, and the first outer shell 136 is a hemisphere when viewed from an oblique direction. Therefore, the thickness D1 from the concave portion 132 of the lens 131 to the first outer shell portion 136 on the +X-axis side is large, and the thickness D2 from the concave portion 132 of the lens 131 to the first outer shell portion 136 on the −X-axis side is large. thin. This is to refract the light radially emitted from the LED 125 centering on the -Z-axis direction in the +X-axis direction as much as possible.

A second shell 138 is formed at the edge of the hemisphere in the −X-axis direction of the first shell 136 . The second shell 138 has a roof surface 138a, a first side surface 138b and a second side surface 138c. A third recess 134 is formed inside the second shell 138 . The third recessed portion 134 is formed to reflect light and to prevent "sink marks" or "warping" when the lens 131 is made of resin. Although the roof surface 138a is flat in the embodiment, it may be a curved surface bulging in the −Z-axis direction. As shown in FIG. 4( a ), the width of the second outer shell 138 is smaller than the width of the first outer shell 136 and substantially the same as the width of the first recess 132 . This is for suppressing glare, and if the width is wider than this, glare is more likely to occur.

The height H2 of the second outer shell 138 from the top surface of the flat plate 135 serving as the reference is higher than the height H1 of the first outer shell 136, and the height H2 of the second outer shell 138 is greater than the height H1 of the first outer shell 136. It is about 1.3 times to 1.7 times. This is to reflect the light emitted from the LED 125 in the -X-axis direction as much as possible in the +X-axis direction. The light emitted in the -X-axis direction includes light that is transmitted and refracted through the first recessed portion 132 and the first outer shell 136 and is irradiated to the first side face 138b. A portion of this light is reflected at the boundary between the air and the first side surface 138b. Further, there is light that is transmitted and refracted through the first recessed portion 132 or the second recessed portion 133 and is irradiated to the side surface of the third recessed portion 134 . Part of this light is reflected at the boundary between the second outer shell 138 and the air of the third recess 134 .

FIG. 5(a) is an overall plan view of one transparent optical member 130 having ten lenses 131, FIG. 5(b) is an overall side view seen from the +Y-axis direction, and FIG. It is the whole side view seen from the +X-axis direction. For positioning with respect to the LED substrate 120 (FIG. 3), the transparent optical member 130 has a notch 139 in a flat plate 135 common to the lens 131, and the LED on the bottom (+Z side) of the flat plate 135. It has a pin PN that goes into the substrate 130 . Thereby, the light emitted from each LED 125 is directed in the direction to be illuminated. A positioning hole PH for inserting the pin PN of the reflecting optical member 141 is formed in the top surface (−Z side) of the flat plate 135 of the transparent optical member 130 . Further, manufacturing the ten lenses 131 as one transparent optical member can reduce the manufacturing process and the manufacturing cost.
<Outline of reflective optical member>
The reflecting optical member 140 of this embodiment has ten reflecting mirrors 141 . The reflective optical member 140 will be described in detail with reference to FIGS. 6 and 7. FIG. FIG. 6 is an enlarged cross-sectional view of one reflecting mirror 141 of the reflecting optical member 140 viewed from a perspective direction.

As shown in FIG. 6, reflector 141 has a frame 144 with one circular or elliptical opening 142 in the frame. This opening 142 is formed in a size that allows the lens 131 to enter when the lens 131 is superimposed. The frame 144 is formed such that the thickness H3 on the +X-axis side is small and gradually increases on the -X-axis side. It is preferable to make the thickness H3 on the +X-axis side as small as possible. Around the opening 142 of the reflecting mirror 141, there is a side wall 143 curved in a circular or elliptical shape when viewed from the Z-axis direction. As can be understood from the thickness of the frame portion 144, the side wall 143a in the +X-axis direction is thin (low height), and the side wall 143b in the -X-axis direction is thick (high). A ceiling wall 146 is formed in the −Z-axis direction of the side wall 143b in the −X-axis direction. The ceiling wall 146 is formed with a width W1 in the X-axis direction from the side wall 143b in the −X-axis direction so as to cover the second outer shell 138 of the lens 131 (see also FIG. 7A). The ceiling wall 146 is formed at a height H4 from the bottom surface of the flat plate 145 (see also FIG. 7(b)). The height H4 of the ceiling wall 146 is higher than or substantially the same as the height H2 of the second shell 138 .

The side wall 143 and the ceiling wall 146 are finished to a mirror surface that reflects light. For example, if the reflecting optical member 140 is aluminum die-cast, it is preferable that at least the side wall 143 and the ceiling wall 146 are mirror-finished. If the reflecting optical member 140 is made of plastic resin plated with nickel, at least the side wall 143 and the ceiling wall 146 are preferably mirror-finished.

As described with reference to FIG. 4, part of the light emitted from the lens 131 in the -X-axis direction is reflected by the first side surface 138b of the second outer shell 138, or reflected by the third recess 134 inside the second outer shell 138. are reflected on the sides of The rest of the light that is not reflected passes through first side 138b and second side 138c. The side wall 143 and the ceiling wall 146 of the reflecting mirror 141 reflect the light passing through the second outer shell 138 in this way and direct it in the +X-axis direction.

7(a) is an overall plan view of one reflecting optical member 140 having ten reflecting mirrors 141, FIG. 7(b) is an overall side view seen from the +Y-axis direction, and FIG. 7(c). is an overall side view seen from the +X-axis direction. In order to show the positional relationship between the lens 131 and the reflecting mirror 141, the lens 131 is drawn with a dashed line at the lower left of FIG. 7(a).

For positioning relative to the transparent optical member 130 (FIG. 5), the reflective optical member 140 has a notch 149 in the flat plate 145 common to the reflectors 141, and the bottom surface of the flat plate 145 (+Z side) has a pin PN to be inserted into the positioning hole PH of the transparent optical member 130 . Thereby, the light emitted from each LED 125 is accurately reflected in the direction to be illuminated. Further, manufacturing the ten reflecting mirrors 141 as one reflecting optical member can reduce the manufacturing process and the manufacturing cost.

DESCRIPTION OF SYMBOLS 10... Lighting unit 20... Control unit 21... Main control part 23... Solar charge circuit 25... AC/DC charge circuit 27... LED light control part 29... Communication part 30... Solar panel 50... Surveillance camera 60 ... LoRa antenna 100 ... LED lighting device 110 ... radiator plate
120... LED board, 125... LED
DESCRIPTION OF SYMBOLS 130... Transparent optical member 131... Lens, 132... 1st recessed part, 133... 2nd recessed part, 134... 3rd recessed part,
135... Flat plate, 136... First outer shell (136a... Minor diameter outer shape, 136b... Longer diameter outer shape), 138... Second outer shell (138a... Roof surface, 138b... First side surface, 138c... Second side surface), 139... Notch 140 Reflective optical member 141 Reflector 142 Opening 143 Side wall 144 Frame 145 Flat plate 146 Ceiling wall 149 Notch 150 Waterproof cover

Claims (7)

An optical unit comprising a transparent optical member made of a transparent material and a reflective optical member made of a reflective material and arranged over the transparent optical member,
The transparent optical member is
a first recess recessed to accommodate the LED;
a first outer shell formed in a hemispherical shape with respect to the optical axis of the LED on the side opposite to the first recess;
a second outer shell formed at the first edge of the hemisphere and formed higher than the first outer shell;
a third recess formed in the second shell,
The reflective optical member is
a frame portion having an opening of the size of the first outer shell portion in plan view;
a sidewall rising from the frame and adjacent to a side surface of the second outer shell;
a ceiling wall covering the roof surface of the second outer shell from the side wall;
An optical unit in which the light from the LED is guided in a predetermined direction by the transparent optical member and the reflective optical member. The cross section of the transparent optical member has a thin thickness from the recess to the first outer portion in the direction of the first edge, and a thin thickness in the direction of the second edge opposite to the first edge. 2. The optical unit according to claim 1, wherein the thickness from the recessed portion to the first outer portion is formed thick. 3. The optical unit according to claim 1, wherein the hemisphere includes an elliptical shape or a track shape in plan view, and the longitudinal direction of the elliptical shape or track shape contacts the first edge. 3. The optical unit according to claim 1, wherein the diameter of the recessed portion is the same as the width of the second outer portion . 5. The optical unit according to any one of claims 1 to 4, wherein the side wall of the reflecting optical member is curved. When the LEDs are arranged on the substrate in N (N is a natural number of 1 or more) rows and M (M is a natural number of 2 or more) columns,
The transparent optical member is formed in N rows and M columns on one transparent flat plate,
6. The optical unit according to any one of claims 1 to 5, wherein the reflecting optical member is formed on a single reflecting flat plate in N rows and M columns. An LED lighting fixture for a street light fixed to an outdoor wall or pillar,
a substrate on which LEDs are arranged;
an optical unit according to any one of claims 1 to 6, arranged over the substrate;
a waterproof cover that covers and waterproofs the optical unit,
The optical unit is an LED lighting fixture for a street light, wherein the second outer shell part is arranged on the side of the wall or the pillar.

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