JP2011028991A - Light source device and display device having the same - Google Patents

Abstract

Provided are a light source device and a display device that can improve light reflectivity around a lens and can achieve uniform luminance.
A light emitting diode substrate 2 having a light emitting diode 1 mounted on one surface, a lens 4 attached to the one surface and diffusing light emitted from the light emitting diode 1, and the lens 4 disposed therein. And the reflection sheets 5 and 6 that reflect the light so as to face the one surface, and the through holes 51 and 61 of the reflection sheets 5 and 6 are large holes 51a and 61a. And two small holes 51b and 61b that are connected to the large holes 51a and 61a, and the two stacked so as to be relatively movable along the light emitting diode substrate 2.
[Selection] Figure 8

Description

  The present invention relates to a light source device including a circuit board on which a light emitting diode is mounted, and a display device including the light source device.

  In a display device such as a television, a light source device is disposed on the rear side of a display unit having a display surface for displaying an image on the front side.

  The light source device includes, for example, a light emitting diode, a hemispherical resin holder that diffuses light emitted from the light emitting diode, a wiring board on which a plurality of the resin holders are juxtaposed, and a groove that houses and supports the wiring board. A plurality of array bases that are spaced apart from each other, a case body that accommodates and supports the array bases, and a through-hole through which each resin holder is inserted, and is placed on the array base A reflection sheet (see, for example, Patent Document 1).

  The resin holder has a hemispherical shape, and the through hole of the reflection sheet has a larger diameter than the resin holder, and the comparison is made so that the resin holder can easily fit into the through hole between the peripheral surface of the resin holder and the through hole. A large annular gap is provided, and the surface of the wiring board is exposed from this gap. Since the surface of the wiring board has low light reflectivity, a white solder resist is applied to the surface of the wiring board to enhance the light reflectivity in the gap.

JP 2008-147147 A

  However, since the light reflectivity of the white solder resist applied to the surface of the wiring board is inferior to the light reflectivity of the reflection sheet as in Patent Document 1, the brightness around the resin holder is reflected by the reflection sheet. There is a problem that it is difficult to achieve uniform luminance.

  The present invention has been made in view of such circumstances, and a main object thereof is to provide a light source device and a display device that can improve the light reflectivity around the lens and can achieve uniform luminance. .

  A light source device according to the present invention includes a circuit board on which a light emitting diode is mounted on one surface, a lens attached to the one surface for diffusing light emitted from the light emitting diode, and a through hole in which the lens is disposed. A light source device having a hole and a reflection sheet that reflects the light facing the one surface, the reflection sheet being stacked in a plurality of layers so as to be relatively movable along the circuit board; Features.

  In the present invention, the reflective sheet can be easily stacked and disposed in the through hole corresponding to the lens, and by moving the reflective sheet relative to the circuit board, the lens peripheral surface and the through hole are arranged. The amount of the gap between them can be reduced at the periphery of the through hole of the reflection sheet, the light reflectivity around the lens can be increased, and the luminance can be made uniform.

In the light source device according to the present invention, it is preferable that the through hole of at least one of the reflection sheets has a large hole portion and a small hole portion connected to the large hole portion.
In this invention, the lens is fitted in the large hole portion of the through hole, the reflective sheet is laminated and disposed, and then the reflective sheet is relatively moved along the circuit board, whereby the lens peripheral surface and the through hole are arranged. It is possible to reduce the amount of the gap between the small holes in the reflection sheet, further improve the light reflectivity around the lens, and further achieve uniform luminance.

In the light source device according to the present invention, the lens has a positioning protrusion facing the circuit board, and the through hole of at least one of the reflection sheets is connected to the semicircular hole portion and the semicircular hole portion. It is preferable that the hole edge has a non-circular hole portion facing the peripheral surface of the positioning protrusion.
In this invention, since the translucent part of the lens can be separated from the circuit board by the positioning protrusion, the reflection sheet is laminated and disposed so that the translucent part fits into the semicircular hole part of the through hole. After that, by moving the reflection sheet along the circuit board, the non-circular hole part can be fitted into the space between the light transmitting part and the circuit board, and the gap between the lens peripheral surface and the through hole Can be eliminated by the non-circular hole portion of the reflection sheet, the light reflectivity around the lens can be further enhanced, and the luminance can be made more uniform.

Further, in the light source device according to the present invention, each of the reflection sheets has a substantially rectangular shape, and one reflection sheet has a first frame piece that is connected to two adjacent sides and has a substantially L-shape. The one reflection sheet is configured to have a second frame piece that is continuous with two sides corresponding to the two sides and that forms a square frame portion facing the first frame piece. preferable.
In this invention, since the rectangular frame portion can be formed by the first frame piece and the second frame piece by laminating the reflection sheets having a substantially rectangular shape, the light reflectivity by the reflection sheet is reduced by the frame. The reflection sheet can be further increased at the portion, and the reflection sheet can be relatively moved without being affected by the frame portion.

Further, in the light source device according to the present invention, each of the reflection sheets has a substantially rectangular shape, and one reflection sheet has a third frame piece that is connected to three sides and has a substantially U-shape. It is preferable that the reflection sheet has a fourth frame piece that is continuous with one side and that forms a square frame portion facing the third frame piece.
In this invention, since the rectangular frame portion can be formed by the third frame piece and the fourth frame piece by laminating the reflection sheets having a substantially rectangular shape, the light reflectivity by the reflection sheet is reduced by the frame. The reflection sheet can be further increased at the portion, and the reflection sheet can be relatively moved without being affected by the frame portion.

Moreover, it is preferable that the light source device according to the present invention includes a reflection frame that is arranged around the reflection sheet and reflects the light.
In this invention, since the reflective frame is arranged around the laminated reflective sheets, the light reflectivity by the reflective sheet can be further enhanced by the reflective frame, and the shape of the reflective frame is maintained. The reflection sheet can be relatively moved without being affected by the reflection frame.

The display device according to the present invention includes a display unit having a display surface on one side, and the above-described light source device arranged on the other side of the display unit so that the light-emitting diode faces the one side. It is characterized by.
In this invention, since the reflection sheet is laminated so as to be relatively movable along the circuit board, the reflection sheet can be arranged without being affected by a lens attached to one surface of the circuit board. In addition, the amount of gap around the lens can be reduced by the reflection sheet, the light reflectivity around the lens can be improved, and the luminance can be made uniform.

  According to the present invention, it is possible to easily stack and arrange the reflective sheets in the through holes corresponding to the lenses, and by relatively moving the reflective sheets along the circuit board, between the lens peripheral surface and the through holes. Can be reduced at the periphery of the through hole of the reflection sheet, the light reflectivity around the lens can be increased, and the luminance can be made uniform.

It is sectional drawing which expanded a part which shows the structure of a display apparatus provided with the light source device which concerns on this invention. It is a disassembled perspective view which shows the structure of the principal part of the light source device which concerns on this invention. It is a perspective view which shows the structure of the light emitting diode board | substrate with which the lens is attached. It is a top view which shows the structure of the light emitting diode board | substrate with which the lens is attached. It is a typical top view which shows the structure of the reflective sheet with which the light source device which concerns on this invention is provided. It is the decomposed | disassembled schematic top view which shows the structure of the reflective sheet with which the light source device which concerns on this invention is provided. It is the top view which expanded a part which shows the structure of the reflective sheet with which the light source device which concerns on this invention is provided. (a) is a top view which shows the relationship between one reflective sheet and a lens, (b) is a top view which shows the relationship between two reflective sheets and a lens. It is the expanded top view which shows the other structure of the principal part of the light source device which concerns on this invention. It is the expanded top view which shows the other structure of the principal part of the light source device which concerns on this invention. It is the expanded top view which shows the other structure of the principal part of the light source device which concerns on this invention. It is the decomposed | disassembled schematic top view which shows the other structure of the reflective sheet with which the light source device which concerns on this invention is provided. It is the decomposed | disassembled schematic top view which shows the other structure of the principal part of the light source device which concerns on this invention.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
Embodiment 1
FIG. 1 is a partially enlarged cross-sectional view showing the structure of a display device including a light source device, FIG. 2 is an exploded perspective view showing the structure of a main part, and FIG. 3 shows the structure of a light-emitting diode substrate to which a lens is attached. FIG. 4 is a perspective view and FIG. 4 is a plan view showing a configuration of a light emitting diode substrate to which a lens is attached.

  The illustrated light source device A is mounted on the rear side of the display unit 10 in a thin display device having a display unit 10 having a substantially rectangular parallelepiped and has a display surface on the front side, and is juxtaposed like a grid. A plurality of light emitting diodes 1 as light sources, and the light emitting diodes 1 are mounted on one surface 2a, and a plurality of light emitting diode substrates 2 juxtaposed in a plurality of rows and adjacent light emitting diode substrates 2 and 2 are connected to each other. A plurality of connectors 3, a plurality of lenses 4 attached to one surface 2 a of the light-emitting diode substrate 2, facing the top of the light-emitting diode 1, and diffusing light emitted by the light-emitting diode 1, First and second reflecting sheets 5 and 6 that have through holes 51 and 61 disposed inside, reflect the light diffused by the lens 4 facing the one surface 2a and one surface of the connector 3, and a light emitting diode. And a support case 7 for accommodating supporting side by side de substrate 2 in a plurality of rows.

  As shown in FIGS. 3 and 4, the light-emitting diode substrate 2 is formed in a strip shape having a circuit portion on one surface 2a. They are juxtaposed (see FIG. 2). As shown in FIGS. 3 and 4, a plurality of light emitting diodes 1 are mounted on one surface 2a of each light emitting diode substrate 2 so as to be separated from each other in the length direction, and connecting portions 21 are provided at both ends of the surface 2a in the length direction. , 22 are provided.

  In the light emitting diode substrates 2 juxtaposed in a plurality of rows so that one ends in the length direction are opposed to each other, the light emitting diode substrates 2 in each row are connected to each other by two connectors 21 and 21 through a connector 3. The connection portion 22 of the light emitting diode substrate 2 is connected to the power circuit board mounted on the rear surface of the support case 7 by the second connector, and the connection portion 22 of the other light emitting diode substrate 2 is mounted on the rear surface of the support case 7. Connected to the control circuit board by a third connector.

  As shown in FIG. 2, for example, 5 or 6 light emitting diodes 1 are mounted separately in the length direction of the light emitting diode substrate 2, and 5 or 6 lenses corresponding to each of the light emitting diodes 1. 4 is attached to one surface 2a with an adhesive.

  The lens 4 is spaced apart from the top of the light emitting diode 1 and has a translucent part 41 having a hemispherical recess for diffusing light emitted by the light emitting diode 1 in all directions, and one surface 2a of the translucent part 41. Projecting toward the light emitting diode substrate 2 and having three positioning projections 42 for determining the position of the translucent portion 41 with respect to the light emitting diode substrate 2, and the tip of the positioning projection 42 is attached to the one surface 2a with an adhesive. It is attached with. The positioning protrusion 42 makes the distance between the light transmitting portion 41 and the light emitting diode substrate 2 slightly longer than the thickness of the reflective sheets 5 and 6, and extends in the direction along the light emitting diode substrate 2 of the reflective sheets 5 and 6. Relative movement is possible.

  The support case 7 is formed by forming a metal plate, has a flat plate portion 71 having a substantially rectangular shape, and a frame portion 72 that is continuous with the periphery of the plate portion 71 and is open on the front side. The light emitting diode substrate 2 is accommodated and supported by 7a in the length direction and the width direction. The frame portion 72 is formed by bending frame pieces that are continuous with the four sides of the plate portion 71.

  A power supply for supplying a voltage to components mounted on a signal processing circuit board, a signal processing circuit board, a light emitting diode board 2 and the like that process a video signal displayed on the display surface of the display unit 10 on the rear surface of the plate unit 71 A plurality of circuit boards such as a circuit board, a control circuit board for driving and controlling the display unit 10, and a control circuit board for controlling a driver of the light emitting diode board 2 are mounted.

  5 is a schematic plan view showing the configuration of the reflective sheet, FIG. 6 is an exploded schematic plan view showing the configuration of the reflective sheet, FIG. 7 is a partially enlarged plan view showing the configuration of the reflective sheet, and FIG. (a) is a top view which shows the relationship between one reflective sheet and a lens, (b) is a top view which shows the relationship between two reflective sheets and a lens.

  The first and second reflection sheets 5 and 6 are made of a synthetic resin sheet material having a high reflectivity and a rectangular shape, and flat portions 52 and 62 having a rectangular shape smaller than the plate portion 71 of the support case 7; The first frame piece 53 and the second frame piece 63 are connected to the two sides of the flat parts 52 and 62 so as to be foldable at the folds. Corresponding through holes 51 and 61 and second through holes 54 and 64 corresponding to the connector 3 are provided. The first frame piece 53 and the second frame piece 63 are also provided at the end of the third side adjacent to one side of the flat portions 52 and 62. Further, flanges 55 and 65 are provided on the periphery of the first frame piece 53 and the second frame piece 63.

  The through holes 51, 61 are recessed outward from one side edge of the large hole portions 51 a, 61 a having a slightly larger diameter than the light transmitting portion 41 and the large hole portions 51 a, 61 a, and having a slightly smaller diameter than the light transmitting portion 41. It has holes 51b and 61b. The second through holes 54 and 64 are substantially rectangular, and the connector 3 is inserted therethrough.

  In the light source device A configured as described above, the light emitting diode substrate 2 in which the plurality of light emitting diodes 1 are mounted on one surface 2 a and the lens 4 facing the top of each of the light emitting diodes 1 is attached is the support case 7. A plurality of rows are juxtaposed on the one surface 7a of the plate portion 71 and attached to the plate portion 71 by means of detent such as a stopper, and then the first reflective sheet 5 is placed on the one surface 2a of the light emitting diode substrate 2 so as to face it. Then, the second reflection sheet 6 is placed on the first reflection sheet 5 so as to be opposed to the first reflection sheet 5 (see FIG. 8B).

  When the first reflection sheet 5 is placed, the translucent part 41 of the lens 4 is fitted into the large hole part 51a of each through hole 51 of the reflection sheet 5, and the flat part 52 is placed on the one surface 2a of the light emitting diode substrate 2. Placed. By moving the first reflective sheet 5 in one direction along the light emitting diode substrate 2 from this state, the small hole portions 51b of the respective through holes 51 fit into the space between the light transmitting portion 41 and the one surface 2a.

  When the second reflection sheet 6 is placed, the translucent part 41 of the lens 4 is fitted into the large hole part 61a of each through hole 61 of the reflection sheet 6, and the flat part 62 is placed on the one surface 2a of the light emitting diode substrate 2. Placed. By moving the second reflecting sheet 6 in the other direction along the light emitting diode substrate 2 from this state, the small hole portions 61b of the through holes 61 fit into the space between the light transmitting portion 41 and the one surface 2a.

  In this way, the small holes 51b and 61b of the through holes 51 and 61 are fitted in the space between the light transmitting part 41 and the one surface 2a of the lens 4, so that the circumferential surface of the light transmitting part 41 and the through holes 51 and 61 are large. The gap between the holes 51a and 61a can be reduced around the through holes 51 and 61 of the reflection sheets 5 and 6, and the light reflectivity around the lens 4 can be improved.

  In addition, since the first and second reflection sheets 5 and 6 are arranged in a stacked manner, the reflection sheets 5 and 6 have a case shape with the front side opened, so that the flat portions 52 and 62 are formed on the light emitting diode substrate 2. The first surface piece 2a and the plate portion 71 of the support case 7 are opposed to each other, the first frame piece 53 and the second frame piece 63 are opposed to the frame portion 72 of the support case 7, and the entire surface of the support case 7 is a reflective surface.

  As shown in FIG. 1, the display device including the light source device A includes a display unit 10 having a display surface for displaying a television image on the front side, a light source device A disposed on the rear side of the display unit 10, and a display unit. 10 and a cabinet 11 for concealing the rear side of the light source device A.

  The display unit 10 includes a display panel 12 having a display surface, and an optical sheet 13 disposed on the rear side of the display panel 12. The peripheral edge of the display panel 12 is held in front and back by a front holding frame body 14 and a rear holding frame body 15 to constitute a panel module, and the rear holding frame body 15 is formed on the peripheral edge portion of the support case 7. Installed.

  The optical sheet 13 is a laminate in which a relatively thick diffuser plate that diffuses light emitted from the light emitting diode 1 as a light source and a relatively thin synthetic resin sheet such as a reflective polarizing plate, a prism sheet, and a diffuser sheet are laminated. The peripheral part of the said diffusing plate is supported by the frame part 72. FIG.

  The cabinet 11 includes a cabinet front part 11a that conceals the front side of the peripheral part of the display unit 10, and a deep dish-shaped cabinet rear part 11b that conceals the peripheral part and the rear side of the light source device A. Is attached to the frame portion 72 by a male screw.

Embodiment 2
FIG. 9 is an enlarged plan view showing another configuration of the main part of the light source device. In this light source device, the through holes 51 and 61 in the reflection sheets 5 and 6 have a semicircular shape instead of the small holes 51b and 61b that are slightly recessed from the side edges of the large holes 51a and 61a. The through holes 51 and 61 have small holes 51c and 61c that are continuous with the large holes 51a and 61a and one side edge of the large holes 51a and 61a and are semicircular.

The large hole portions 51a and 61a have a larger diameter than the light transmitting portion 41, the small hole portions 51c and 61c have the same diameter as the light transmitting portion 41 or a smaller diameter than the light transmitting portion 41, and the light transmitting portion 41 passes through each of the light transmitting portions 41. When the reflection sheets 5 and 6 are relatively moved from the state of being fitted into the large holes 51a and 61a of the holes 51 and 61, the small holes of the through holes 51 and 61 are formed in the space between the light transmitting part 41 and the one surface 2a. 51c and 61c are configured to fit.
Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof and description of operations and effects are omitted.

Embodiment 3
10 and 11 are enlarged plan views showing another configuration of the main part of the light source device. In this light source device, the through holes 51 and 61 in the reflection sheets 5 and 6 are connected to the semicircular hole portions 51d and 61d having a diameter larger than that of the light transmitting portion 41 and the semicircular hole portions 51d and 61d, and the edge of the hole is formed. The shape is such that it has non-circular hole portions 51e, 61e facing the peripheral surface of the positioning projection 42.

The non-circular hole portions 51e and 61e are formed in a non-circular shape corresponding to the number of the positioning protrusions 42 and the circumferential position, and the non-circular hole portions 51e and 61e are transmitted through the space between the translucent portion 41 and the one surface 2a. It is comprised so that it can approach to the center side rather than the surrounding surface of the optical part 41. FIG. FIG. 10 shows a case where there are three positioning protrusions 42, and FIG. 11 shows a case where there are two positioning protrusions 42.
Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof and description of operations and effects are omitted.

Embodiment 4
FIG. 12 is an exploded schematic plan view showing another configuration of the reflection sheet provided in the light source device. Instead of the reflection sheets 5 and 6 having a rectangular flat parts 52 and 62, and a first frame piece 53 and a second frame piece 63 that are connected to two sides of the flat parts 52 and 62, Flat portions 52 and 62 having a rectangular shape smaller than the portion 71, a third frame piece 56 having a substantially U-shape that is connected to the three sides of the flat portion 52 so as to be foldable, and a flat portion 62. It is configured to have a fourth frame piece 66 for forming a square frame portion opposite to the third frame piece 56 so as to be able to be bent at one side.

  The flat portions 52 and 62 are provided with through holes 51 and 61 corresponding to the respective lenses 4 and second through holes 54 and 64 corresponding to the connector 3. The fourth frame piece 66 is also provided at the ends of two sides adjacent to one side of the flat portion 62. Further, flanges 55 and 65 are provided on the periphery of the third frame piece 56 and the fourth frame piece 66.

Even in this case, by arranging the reflective sheets 5 and 6 in a stacked manner, a square frame portion is formed by the third frame piece 56 and the fourth frame piece 66, and the lens 4 peripheral surface and the through hole 51 are formed. , 61 can be reduced.
Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof and description of operations and effects are omitted.

Embodiment 5
FIG. 13 is an exploded schematic plan view showing another configuration of the main part of the light source device. This light source device is composed of the flat portions 52 and 62 having a rectangular shape without the frame pieces, instead of the reflection sheets 5 and 6 having the frame pieces provided on the sides of the flat portions 52 and 62 having a rectangular shape. The reflection sheets 5 and 6 and a trapezoidal square cylinder shape are provided, and the reflection frame 8 is provided around the reflection sheets 5 and 6.

  The reflection sheets 5 and 6 are provided with through holes 51 and 61 corresponding to the lenses 4 and second through holes 54 and 64 corresponding to the connector 3.

  The reflection frame 8 is formed by forming a highly reflective synthetic resin sheet into a trapezoidal rectangular tube shape, or bending the three portions of the synthetic resin sheet having a band shape in an orthogonal shape, and double-sided tape at both ends. It couple | bonds by the coupling | bonding means. A flange 81 is provided on the periphery of the reflection frame 8.

Even in this case, since the reflective frame 8 is arranged around the laminated reflective sheets 5 and 6, the light reflectivity by the reflective sheets 5 and 6 can be further enhanced by the reflective frame 8, In addition, the amount of the gap between the peripheral surface of the lens 4 and the through holes 51 and 61 can be reduced.
Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof and description of operations and effects are omitted.

  In the embodiment described above, the two reflection sheets 5 and 6 are laminated so as to be relatively movable, but in addition, one reflection sheet 5 is arranged non-moving and the other reflection sheet is one. It is good also as a structure which carries out lamination | stacking arrangement | positioning of 6 so that movement is possible. Even in this case, the gap amount between the peripheral surface of the lens 4 and the through holes 51 and 61 can be reduced.

  In the embodiment described above, the reflection sheets 5 and 6 are arranged so as to be capable of relative movement in the length direction. However, the reflection sheets 5 and 6 may be arranged so as to be capable of relative movement in the width direction. Good.

  Moreover, in embodiment described above, it is set as the structure in which the reflection sheets 5 and 6 have the 1st frame piece 53, the 2nd frame piece 63, or the 3rd frame piece 56, the 4th frame piece 66, or Although the reflection frame body 8 is provided separately from the reflection sheets 5 and 6 including the flat portions 52 and 62, a configuration without a frame portion such as the reflection frame body 8 may be employed.

1 Light-emitting diode 2 Light-emitting diode substrate (circuit board)
4 Lens 42 Positioning projection 5, 6 Reflective sheet 51, 61 Through hole 51a, 61a Large hole part 51b, 61b Small hole part 51d, 61d Semi-circular hole part 51e, 61e Non-circular hole part 53 First frame piece 63 Second frame Piece 56 Third frame piece 66 Fourth frame piece 8 Reflecting frame 10 Display unit A Light source device

Claims (7)

  A circuit board having a light emitting diode mounted on one surface; a lens attached to the one surface for diffusing light emitted by the light emitting diode; and a through hole in which the lens is disposed. A light source device comprising: a reflection sheet that reflects the light opposite to the light source device, wherein a plurality of the reflection sheets are stacked so as to be relatively movable along the circuit board.   2. The light source device according to claim 1, wherein the through hole of at least one of the reflection sheets includes a large hole portion and a small hole portion connected to the large hole portion.   The lens has a positioning projection facing the circuit board, and the through hole of at least one of the reflection sheets is connected to a semicircular hole portion and the semicircular hole portion, and an edge of the hole is a circumference of the positioning projection. The light source device according to claim 1, further comprising a non-circular hole facing the surface.   Each of the reflection sheets has a substantially rectangular shape, and one reflection sheet has a first frame piece that is continuous with two adjacent sides and has a substantially L-shape, and the other reflection sheet is the two reflection sheets. 4. The light source device according to claim 1, further comprising: a second frame piece that is connected to two sides that face one side, and that forms a square frame portion facing the first frame piece. 5. .   Each of the reflection sheets has a substantially rectangular shape, and one reflection sheet has a third frame piece that is connected to three sides and has a substantially U-shape, and the other reflection sheet is on one side. 4. The light source device according to claim 1, wherein the light source device includes a fourth frame piece that is continuous and forms a square frame portion facing the third frame piece. 5.   The light source device according to any one of claims 1 to 3, further comprising a reflective frame body that is arranged around the reflection sheet and reflects the light.   A display unit having a display surface on one side, and the light source device according to claim 1, wherein the light emitting diode is disposed on the other side of the display unit so as to face the one side. A display device characterized by that.

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