JP2021012822A - Lighting device - Google Patents

Abstract

To provide a lighting device in which a receiving portion receiving a remote control signal from an operation remote controller is disposed on the opposite side to a light guiding plate across a reflection sheet, and which can prevent the generation of so-called black dot defects of an opening portion of the reflection sheet when the opening portion for receiving is formed on the reflection sheet.SOLUTION: One end in a longitudinal direction is located near an opening portion 4a of a reflection sheet 2. At an end portion on an opening portion 40a side of a transmission member 30 disposed while the other end in the longitudinal direction faces the receiving portion, a flange member 40 larger than an end portion area and the opening portion of the transmission member is provided, and the flange member 40 is disposed while blocking the opening portion 4a. The flange member 40 is formed in the same color or a similar color to the reflection sheet 4.SELECTED DRAWING: Figure 4

Description

The present invention relates to a lighting device of a type that illuminates by radiating light from a light source incident on a light guide plate as illumination light from the light guide plate.

A lighting device of a type that illuminates with the illumination light emitted from the light guide plate as described above has been conventionally known (for example, Patent Document 1), but recently, a light source such as an LED is provided on the peripheral side surface of the light guide plate. A lighting device has also been proposed in which the light from the light source is incident on the inside of the light guide plate while the reflection sheet is arranged on one side (for example, the upper surface side) in the thickness direction of the light guide plate. In this lighting device, the light incident on the inside of the light guide plate from the light source is reflected by the reflective sheet to the other surface side (for example, downward) in the thickness direction of the light guide plate and emitted to the other surface side of the light guide plate. Illuminate.

By the way, it is common to operate the lighting device by a remote controller, but in a lighting device in which a reflective sheet is arranged on one side in the thickness direction of the light guide plate, the side opposite to the light guide plate is sandwiched between the reflective sheets. A control board may be arranged on the control board, and a receiving unit that receives, for example, infrared light, which is a remote control signal from an operation remote controller, may be arranged on the control board. In this case, even if the user operates the remote controller to transmit the remote controller signal from the other side in the thickness direction of the light guide plate, the remote controller signal is reflected by the reflective sheet and does not reach the receiver, so that the position facing the receiver is reached. It is necessary to form an opening in the reflective sheet. However, since the reflective sheet and the receiving portion are separated from each other, simply forming an opening in the reflective sheet may not reach the receiving portion when the remote control signal is transmitted from an oblique direction with respect to the opening. ..

Therefore, it is conceivable that one end in the length direction is located near the opening and the other end faces the receiving portion, and a transmission member made of a light guide member is interposed. According to this transmission member, the remote control signal from the remote control can be received from one end on the opening side of the transmission member, transmitted to the other end, and guided from the other end to the receiving part. The range can be expanded.

In particular, in FIG. 18 of Patent Document 2, in order to guide the remote control signal to the receiving portion behind the heat radiating plate, an opening is formed in the heat radiating plate, and one end in the length direction protrudes from the opening. A lighting device is disclosed in which a light guide member is provided so that the end faces the receiving unit, and the remote control signal is guided to the receiving unit by the light guide member.

Japanese Patent No. 5449098 Japanese Patent No. 5331581

However, when an opening is formed in the reflective sheet and a transmission member is arranged, the transmission member is composed of a light guide member, so that the opening of the reflective sheet looks black when viewed from the illuminated side during operation of the lighting device. There is a problem that so-called blackout occurs.

Since the lighting device described in Patent Document 2 described above is not a type of lighting device that uses a light guide plate and a reflective sheet, it has not been possible to provide a solution to the problem of blackout.

The present invention has been made to solve such a problem, and a receiving unit for receiving a remote control signal from an operation remote controller is arranged on the opposite side of the light guide plate across the reflective sheet, and is also reflected. It is an object of the present invention to provide a lighting device capable of preventing the occurrence of so-called black spots in which the opening of the reflective sheet looks black when the opening for reception is formed in the sheet.

The above object is achieved by the following means.
(1) A light source, a light guide plate for incident light from the light source, a receiving unit arranged on one side in the thickness direction of the light guide plate and receiving a remote control signal from an operation remote control, the light guide plate and the above. Reflection that is arranged between the receiving portions and reflects the light from the light source incident on the light guide plate to the other surface side in the thickness direction of the light guide plate, and an opening is formed at a position facing the receiving portion. The sheet and one end in the length direction are located near the opening, the other end in the length direction faces the receiving part, and the remote control signal received on one end side in the length direction is received by the receiving part. A transmission member that leads to the light source, and a flange member that is provided at the end of the transmission member on the opening side and is made of a material that is larger than the end area of the transmission member and the opening and allows the remote control signal to pass through. The lighting device is characterized in that the flange member is formed in the same color as or similar to that of the reflective sheet, and is arranged in a state of closing the opening.
(2) The lighting device according to item 1 above, wherein the flange member has a thicker central portion than a peripheral end portion on a surface on the transmission member side.
(3) The lighting device according to item 1 or 2 above, wherein the flange member is arranged so as to be sandwiched between the reflective sheet and the light guide plate, and the transmission member is arranged so as to penetrate the opening.
(4) The lighting device according to any one of items 1 to 3 above, wherein the flange member is made of polycarbonate.
(5) The lighting device according to any one of items 1 to 4 above, wherein the transmission member is made of transparent acrylic.

According to the invention described in the preceding paragraph (1), an opening of a transmission member arranged so that one end in the length direction is located near the opening of the reflective sheet and the other end in the length direction faces the receiving portion. A flange member larger than the end area of the transmission member and the opening is provided at the side end, and the opening is closed by the flange member. Since the flange member is formed in the same color as or similar to that of the reflective sheet, it is possible to prevent the reflective sheet from appearing black at the opening when viewed from the illuminated side during illumination, and the appearance is improved and the commercial value is improved. Can be enhanced. Further, since the flange member is made of a material that allows the remote control signal to pass through, the incident of the remote control signal into the transmission member is not hindered, and the reception sensitivity is not lowered.

According to the invention described in the preceding paragraph (2), since the flange member is formed with a thicker central portion than the peripheral end portion on the surface on the transmission member side, the opening is black due to the central portion of the thick wall. In addition to being able to better prevent omission, it is possible to make a natural transition with the hue from the central part of the thick wall to the peripheral end of the thin wall blurred. Therefore, the flange member becomes inconspicuous, and the entire surface of the reflective sheet including the opening can be visually recognized in a more uniform color.

According to the invention described in the preceding paragraph (3), since the flange member is arranged so as to be sandwiched between the reflective sheet and the light guide plate, the flange member is supported by the reflective sheet and the light guide plate. Therefore, since the transmission member provided with the flange member is also supported by the reflective sheet and the light guide plate, the transmission member can stand on its own in a predetermined posture without the need for a separate fixing member for fixing the transmission member. This makes it easier to assemble the transmission member.

According to the invention described in the preceding paragraph (4), since the flange member is made of polycarbonate, it is possible to easily realize, for example, milky white, which is the same color as or similar to the reflective sheet, without hindering the incident of the remote control signal into the transmission member. The opening can be closed.

According to the invention described in the preceding paragraph (5), since the transmission member is made of transparent acrylic, the remote control signal received at the end on the opening side is efficiently transmitted to the end on the receiving part side and sent to the receiving part. Can be released.

(A) is a vertical sectional view of the lighting device according to the embodiment of the present invention, and (B) is an enlarged view of a portion surrounded by the chain line of (A). It is sectional drawing which shows the opening formed in the reflective sheet. (A) is a perspective view of a transmission member and a flange member, and (B) is a vertical sectional view of the transmission member and the flange member. It is an enlarged view of the attachment part of the transmission member and the flange member in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1A is a vertical sectional view of the lighting device 1 according to the embodiment of the present invention. The lighting device 1 includes a circular light guide plate 2 arranged horizontally, and includes a light emitting diode (LED) that irradiates a light beam toward the inside of the light guide plate 2 over the entire peripheral side surface of the light guide plate 2. The light source 3 is arranged. The light guide plate 2 is not limited, but is made of, for example, an acrylic plate or the like.

As shown in the enlarged view of FIG. 1B, reflective sheets 4 having substantially the same diameter as the light guide plate 2 are laminated on the upper surface (corresponding to one surface side in the thickness direction) of the light guide plate 2. In this specification, the word "sheet" is used to include a film. The reflective sheet 4 is made of, for example, white to milky white polyethylene terephthalate (PET) having high reflectance and the like, although not limited thereto. The reflective sheet 4 plays a role of reflecting the light from the light source 3 that is incident on the inside of the light guide plate 2 and diffused upward, downward on the illuminated side.

On the lower surface of the light guide plate 2 (corresponding to the other surface side in the thickness direction), for example, a diffusion sheet 5 made of a milky white acrylic sheet or the like is laminated. The light from the light guide plate 2 and the light reflected by the reflection sheet 4 are diffused by the diffusion sheet 5 to become soft light.

The light guide plate 2, the reflective sheet 4, and the diffusion sheet 5 are integrally sandwiched by the sandwiching member 6 at the peripheral end portions, fixed by screws, and attached to the frame member 7.

The upper part of the reflective sheet 4 is covered with a cover member 8 whose peripheral end is connected to the frame member 7, and a substrate accommodating portion 9 which opens downward is attached to the central portion of the upper surface of the cover member 8. The substrate 10 is accommodated in the substrate accommodating portion 9, and various circuits and control components such as a lighting circuit of a light source 3 and a power supply circuit are mounted on the substrate 10.

Further, a light receiving unit (corresponding to a receiving unit) 20 that receives infrared light, which is a remote control signal, is attached downward to the substrate 10. Although the light receiving portion 20 and the reflective sheet 4 are separated from each other, an opening 4a formed of a circular hole is formed in a portion of the reflective sheet 4 facing the light receiving portion 20 as shown in FIG. The upper surface of the light guide plate 2 located on the lower side is exposed.

Reference numeral 11 shown in FIG. 1A is an attachment portion for attaching the lighting fixture to the ceiling or the like, and is fixed to the upper surface of the substrate accommodating portion. Reference numeral 12 is a reinforcing member that connects the substrate accommodating portion 9 and the cover member 8.

A columnar transmission member 30 is interposed between the light receiving unit 20 and the reflective sheet 4. The lower end of the transmission member 30 is located near the opening 4a of the reflective sheet 4, and the upper end is arranged so as to face the light receiving portion 20 and face the light receiving portion 20. The remote controller received from the lower end of the transmission member 30. It plays a role of transmitting infrared light, which is a signal, to the upper end and emitting it from the upper end toward the light receiving unit 20. For this reason, the transmission member 30 is made of a light guide member, and is made of, for example, a transparent acrylic resin having a high light guide property, without limitation.

Further, as shown in FIGS. 3A and 3B, a flange member 40 is formed on the end surface of the transmission member 30 on the reflective sheet 4 side. In this embodiment, the flange member 40 is obtained by laminating two circular plate members 41, 42 having different diameters so that the plate material 42 having a large diameter is on the lower side and the plate material 41 having a small diameter on the upper side, and the flange member 40 is transmitted by an adhesive or the like. The member 30, the upper plate member 41, and the two plate members 41, 42 are joined to each other to be integrally formed with each other. The upper plate 41 has a diameter slightly larger than the opening 4a of the reflective sheet 4, the lower plate 42 has a larger diameter than the upper plate 41, and therefore the flange member 40 is on the transmission member 30 side. In terms of the surface, the central portion 40a is thickened by overlapping the two plate members 41 and 42, and the peripheral end portion 40b is composed of only the lower plate member 42 and is relatively thin. However, the thickness may be the same over the entire area of the flange member 40. Further, although two plates 41 and 42 having different diameters are laminated, one plate may be formed so that the wall thicknesses of the central portion and the peripheral end portion are different. Further, the transmission member 30 and the flange member 40 may be integrally molded with one material.

The flange member 40 serves to close the opening 4a of the reflective sheet 4 and prevent so-called black spots in which the reflective sheet 4 looks black in the opening 4a when viewed from the illuminated side during illumination. On the other hand, infrared light, which is a remote control signal, needs to pass through the flange member 40 and proceed to the transmission member 30 without being reflected by the flange member 40. For this reason, the flange member 40 is made of, for example, polycarbonate, which has good infrared light transmission, although is not limited. Further, in order to prevent so-called black spots, the flange member 40 is formed in the same color or an approximate color as the reflective sheet 4. In this embodiment, since the reflective sheet 4 is white to milky white, white to milky white polycarbonate is also used for the flange member 40.

As shown in detail in FIG. 4, the flange member 40 is arranged so as to be sandwiched between the reflective sheet 4 and the light guide plate 2, and the transmission member 30 joined to the upper surface of the flange member 40 in an upright state is , It extends vertically in a state of penetrating the opening 4a of the reflective sheet 4 from below to above. Since the flange member 40 is arranged so as to be sandwiched between the reflective sheet 4 and the light guide plate 2 in this way, the flange member 40 is supported by the reflective sheet 4 and the light guide plate 2. Therefore, since the transmission member 30 joined to the flange member 40 is also supported by the reflective sheet 4 and the light guide plate 2, the transmission member 30 does not require a separate fixing member for fixing the transmission member 30. Can stand on its own in a vertical posture, facilitating the assembly work of the transmission member 30.

In the mounted state of the flange member 40 and the transmission member 30, the peripheral portion of the opening 4a of the reflective sheet 4 covers the upper side of the flange member 40, and the opening 4a of the reflective sheet 4 is covered by the thick central portion 40a of the flange member 40. It is blocked.

When the user operates the remote controller to transmit a remote controller signal in order to turn on the illumination device 1, the light source 3 emits light and the illumination light is emitted downward from the light guide plate 2, and the lower region on the illuminated side is the illumination device. Illuminated by 1. Since the flange member 40 is formed to be white or milky white like the reflective sheet 4, when the user sees from below in the lighting state of the lighting device 1, the existing portion of the opening 4a is formed by the flange member 40 by the reflective sheet 4. The color is the same as or similar to that of the above, and the so-called blackout that the reflective sheet 4 looks black at the opening 4a does not occur.

In particular, since the flange member 40 has a thicker central portion 40a than the peripheral end portion 40b on the surface on the transmission member 30 side, the blackout of the opening 4a is more effective due to the thick central portion 40a. Is prevented. Moreover, the color from the central portion 40a of the thick wall to the peripheral end portion 40b of the thin wall is in a blurred state and the transition occurs naturally. For this reason, the portion of the opening 4a becomes less noticeable, and the entire surface of the reflective sheet 4 including the opening 4a can be visually recognized in a uniform color without giving a sense of discomfort to the user, and the lighting has a good appearance and high commercial value. It becomes the device 1.

Further, since the flange member 40 is made of a material that allows infrared light, which is a remote control signal, to pass through, the remote control signal is incident on the lower end of the transmission member 30 without being shielded by the flange member 40. The remote control signal incident from the lower end is transmitted to the upper end of the transmission member 30, emitted from the upper end to the light receiving unit 20, received by the light receiving unit 20, and the operation corresponding to the remote control signal is executed without any problem. To.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, the flange member 40 is arranged so as to be sandwiched between the reflective sheet 4 and the light guide plate 2, and the transmission member 30 penetrates the opening 4a from below and protrudes upward. The opening 4a may be closed by covering the reflective sheet 4 with the above.

1 Lighting device 2 Light guide plate 3 Light source 4 Reflection 4a Opening 5 Diffusion sheet 9 Board housing part 10 Board 20 Light receiving part (receiver)
30 Transmission member 40 Flange member 40a Central part 40b Peripheral end part 41, 42 Plate material

Claims (5)

Light source and
A light guide plate for incident light from the light source and
A receiving unit that is arranged on one side in the thickness direction of the light guide plate and receives a remote control signal from an operation remote controller.
It is arranged between the light guide plate and the receiving portion, reflects the light from the light source incident on the light guide plate to the other surface side in the thickness direction of the light guide plate, and has an opening at a position facing the receiving portion. With the reflective sheet on which
One end in the length direction is located near the opening, the other end in the length direction faces the receiving part, and the remote control signal received on the one end side in the length direction is guided to the receiving part. With the transmission member
A flange member provided at the end of the transmission member on the opening side, which is larger than the end area of the transmission member and the opening and is made of a material through which the remote control signal is passed.
With
A lighting device characterized in that the flange member is formed in the same color or an approximate color as the reflective sheet and is arranged in a state of closing the opening. The lighting device according to claim 1, wherein the flange member has a thicker central portion than a peripheral end portion on a surface on the transmission member side. The lighting device according to claim 1 or 2, wherein the flange member is arranged so as to be sandwiched between the reflection sheet and the light guide plate, and the transmission member is arranged so as to penetrate the opening. The lighting device according to any one of claims 1 to 3, wherein the flange member is made of polycarbonate. The lighting device according to any one of claims 1 to 4, wherein the transmission member is made of transparent acrylic.

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