JP2013025868A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a direct illumination type lighting device that can emit uniform light from an illumination cover while thinning of the device is attained.SOLUTION: The lighting device includes a diffusion member 30 which diffuses light emitted from LEDs 22 and is installed apart from the illumination cover in a light irradiation direction side of a light source module 20 where a plurality of light sources 22 are mounted so that the irradiation direction is approximately perpendicular to a mounting surface.

Description

  The present invention relates to a direct-lighting type lighting device that can irradiate uniform light from a lighting cover while reducing the thickness of the lighting device.

  LEDs (Light Emitting Diodes) are being adopted as light sources for lighting devices because they have advantages such as long life and low power consumption. Various lighting devices using LEDs as light sources are attracting attention as the next-generation energy-saving lighting that is kind to the earth.

  For example, Patent Literature 1 discloses an illumination device (ceiling light) including an LED as a light source. The illumination device of Patent Document 1 is a so-called direct-lighting illumination device in which a plurality of LEDs are installed in parallel to a mounting surface such as a ceiling. The direct-lighting illumination device is installed so that the irradiation direction of the LED is perpendicular to the mounting surface. For this reason, compared with the illuminating device which is installed so that the irradiation direction of the LED is parallel to the mounting surface and reflects the indoor (floor) side by the reflecting surface on the ceiling side, the direct-lighting illuminating device is There is little loss of light. Therefore, the direct-lighting type illumination device can illuminate the room brightly.

JP 2010-140797 A (published on June 24, 2010)

  However, the illuminating device of Patent Document 1 has a problem that it is difficult to simultaneously satisfy the reduction in thickness of the illuminating device and the uniform light irradiation from the translucent cover.

  The illuminating device of patent document 1 is equipped with the milky white translucent cover which covers LED normally. And the emitted light from LED accommodated inside the translucent cover is diffused by the translucent cover, and irradiates the room.

  However, if the distance between the LED and the translucent cover is too close, the light emitted from the LED is not sufficiently diffused by the translucent cover, and uniform irradiation from the translucent cover becomes difficult. Therefore, in order to irradiate uniform light from the translucent cover, the LED needs to be located at a certain distance from the translucent cover.

  Specifically, in order to irradiate uniform light from the translucent cover (to make the translucent cover emit light uniformly), the pitch of the LEDs (the interval between adjacent LEDs), the distance from the LED to the translucent cover, Must match. That is, in order to realize a thinner lighting device, it is necessary to reduce the pitch of the LEDs. For this reason, the thinner the lighting device, the greater the number of LEDs installed. As a result, the amount of heat generated when the LEDs are lit increases in proportion to the number of installations. For this reason, it is indispensable to dissipate heat generated in the LED, resulting in high costs. As described above, if the LED pitch is narrowed to reduce the thickness, another problem such as heat generation and high cost due to an increase in the number of LEDs will occur.

  On the other hand, in order to irradiate uniform light from the translucent cover after reducing the number of LEDs installed, the distance from the LED to the translucent cover is set so that the pitch of the LEDs is wide and the pitch is the same. Need to open. As a result, the lighting device can emit light uniformly, but the lighting device cannot be thinned.

  The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a direct-lighting illumination device that can illuminate uniform light from the illumination cover while reducing the thickness of the illumination device. Is to provide.

In order to solve the above problems, the lighting device of the present invention is a lighting device installed on a mounting surface.
A light source module on which a plurality of light sources are mounted such that the irradiation direction is substantially perpendicular to the mounting surface;
A lighting cover that transmits light from the light source module;
The light source module is provided with a diffusing member provided on the light emitting direction side of the light source module so as to be separated from the illumination cover and diffusing the light emitted from the light source module.

  The lighting device according to the present invention is a so-called direct-lighting type lighting device in which the irradiation direction of the light source mounted on the light source module is perpendicular to the mounting surface (installation surface) of the lighting device.

  According to said structure, the diffusion member is provided in the light emission direction side (namely, on an optical path) of a light source module. The diffusing member is provided apart from the illumination cover that transmits the light from the light source module. Thereby, the emitted light from the light source module is diffused by the diffusion member, and the diffused light reaches the illumination cover. Therefore, uniform light can be emitted from the lighting cover.

  In other words, according to the above configuration, even if the pitch of the light source in the light source module is set wide, the light from the light cover can be irradiated with uniform light without matching the distance from the light source module to the light cover. it can. Therefore, the distance from the light source module (light source) to the illumination cover can be set shorter than the pitch of the light sources.

  As described above, according to the above configuration, the light emitted from the light source module is diffused by the diffusion member before reaching the illumination cover. Therefore, in the direct illumination type illumination device, it is possible to irradiate uniform light from the illumination cover while reducing the thickness of the illumination device.

  In the present specification, the “substantially perpendicular direction” means a direction that can be regarded as substantially vertical in addition to a direction that is strictly perpendicular to the mounting surface.

In the lighting device of the present invention, comprising a chassis installed on the mounting surface,
The light source module is installed in the chassis,
The diffusion member may be provided on a light emission direction side of a light source provided on an outer edge portion of the chassis.

  In the lighting device according to the present invention, among the light source modules mounted on the chassis installed on the mounting surface of the lighting device, the light emitted from the light source mounted on the outer edge (end) of the chassis is the outer edge of the lighting cover. It is difficult to reach the part (end part). That is, the outer edge portion of the lighting cover tends to be dark.

  So, according to said structure, the diffusion member is provided in the light emission direction side of the light source provided in the outer edge part of the chassis. Thereby, the emitted light from the light source provided at the outer edge of the chassis is diffused by the diffusing member. As a result, the light diffused by the diffusing member reaches the outer edge of the lighting cover that tends to be dark. Therefore, uniform light can be more reliably irradiated from the illumination cover.

  In the illumination device of the present invention, it is preferable that the diffusing member is provided apart from the light source module.

  According to the above configuration, the diffusing member is provided apart from the light source module as well as the illumination cover. Thereby, the emitted light from the light source module is sufficiently diffused by the diffusing member and applied to the illumination cover. Therefore, more uniform light can be emitted from the lighting cover.

  In the illumination device of the present invention, the light source module may have a non-mounting region where the diffusing member is not mounted on the light emission direction side of the light source.

  According to said structure, the diffusion member is provided so that the non-mounting area | region where a diffusion member is not mounted may be formed in the light emission direction side of a light source module. That is, a non-mounting area where the diffusion member is not provided and a mounting area where the diffusion member is provided are formed on the light emission direction side of the light source. Thereby, in the non-mounting area, the light emitted from the light source reaches the illumination cover directly without being diffused by the diffusion member. Accordingly, it is possible to reduce the loss of the light emitted from the light source and the decrease in the amount of light reaching the illumination cover due to entering the diffusing member. On the other hand, in the mounting area, the light emitted from the light source is diffused by the diffusion member. Therefore, the diffusion effect of the light emitted from the light source module by the diffusing member can be obtained. Therefore, it is possible to irradiate uniform light from the illumination cover while reducing the loss of the emitted light and the decrease in the amount of light.

  If the area of the non-mounting region is large, it is possible to reduce the loss of light emitted from the light source module and the reduction in the amount of light. On the other hand, if the area of the mounting region is small, the diffusion effect of the emitted light of the light source module by the diffusion member can be enhanced.

  The illumination device of the present invention may include a reflecting member that reflects the light reflected by the diffusing member and makes the light incident on the diffusing member.

  According to said structure, even if the emitted light from a light source module is reflected by a diffusion member, a reflection member makes the light reflected by the diffusion member inject into a diffusion member. Therefore, it is possible to suppress a decrease in the amount of light reaching the illumination cover while reducing the loss of light emitted from the light source module.

  The lighting device of the present invention may include a spacer provided between the light source module and the diffusing member, and a first fixing member that fixes the diffusing member to the light source module via the spacer.

  According to the above configuration, since the spacer is provided between the light source module and the diffusion member, it is possible to prevent the diffusion member from being bent and to keep the distance between the light source module and the diffusion member constant. In addition, the diffusion member can be fixed to the light source module by the first fixing member while the diffusion member is supported by the spacer.

  The illumination device of the present invention may include a second fixing member that fixes the light source module to the chassis, and a third fixing member that fixes the diffusion member to the second fixing member.

  According to said structure, the 3rd fixing member which fixes a diffusion member is fixed to the 2nd fixing member which fixes a light beam module. For this reason, when the diffusion member is fixed, it is only necessary to align the fixing portion of the diffusion member with respect to the second fixing member. Therefore, the diffusion member can be easily fixed.

  The illuminating device of the present invention includes a fourth fixing member that fixes the diffusing member to the light source module, and the diffusing member has a flange that is recessed toward the light source module in a fixing portion by the fourth fixing member. It may be.

  According to said structure, a 4th fixing member fixes a diffusion member to a light source module in the position of the collar part formed in the diffusion member. Since the flange is a portion that is recessed toward the light source module in the diffusing member, a step is formed on the diffusing member. Therefore, the diffusion member can be fixed to the light source module without providing a spacer between the light source module and the diffusion member.

  ADVANTAGE OF THE INVENTION According to this invention, in a direct-lighting type illuminating device, there exists an effect that uniform light can be irradiated from an illumination cover, reducing an illuminating device thinly.

It is sectional drawing which shows the light source module and diffusion sheet which were provided in the illuminating device which concerns on one Embodiment of this invention, and its partial enlarged view, and is a figure which shows the cross section of a perpendicular direction with respect to the attachment surface of an illuminating device. It is a figure which shows the illuminating device which concerns on one Embodiment of this invention, (a) is sectional drawing, (b) is the top view seen from the light-projection surface side. It is a top view which shows the arrangement | positioning state of the light source module in the said illuminating device. It is a top view of the light source module and diffusion member in the said illuminating device. It is sectional drawing which shows the fixing method of the diffusion member in the said illuminating device. It is sectional drawing which shows another fixing method of the diffusion member in the said illuminating device. It is sectional drawing which shows another fixing method of the diffusion member in the said illuminating device.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 2A and 2B are diagrams showing the illumination device 1 according to the embodiment of the present invention, in which FIG. 2A is a cross-sectional view and FIG. 2B is a plan view seen from the light emitting surface side. The illuminating device 1 of this embodiment is a ceiling light attached to the attachment surface X of a ceiling. In the following description, for the sake of convenience, the indoor (floor) side will be described as “lower (lower side)” and the ceiling (mounting surface) side will be described as “upper (upper side)”.

  As shown in FIG. 2, the lighting device 1 includes a chassis 11 installed in parallel to the mounting surface X such as a ceiling, a lighting cover 12 attached to the outer edge of the chassis 11, and a central portion of the lighting cover 12. A center cover 13 that closes the formed opening 14, a projecting member 15 that projects from the center of the chassis 11 toward the room (floor), and a light source module 20 that is mounted on the chassis 11 are provided. In addition, FIG. 2 is described in a simplified manner, and a later-described diffusion sheet is omitted.

  In the lighting device 1, the outer shape (the shape in plan view) of the chassis 11 and the lighting cover 12 is a shape in which each side of the quadrangle and each corner are rounded. The outer shapes of the chassis 11 and the lighting cover 12 are not particularly limited, and various shapes and sizes such as a circle and a polygon are allowed according to the appearance and preference. An opening 14 is formed in the center of the chassis 11 and the lighting cover 12. A rosette 90 attached to the ceiling is inserted into the opening 14. Thereby, the illuminating device 1 is attached to the attachment surface X so that attachment or detachment is possible.

  The chassis 11 can be made of, for example, a material with high heat dissipation such as aluminum, iron, or resin. The light source module 20 is mounted on the chassis 11 so as to be parallel to the mounting surface X. Thereby, the heat generated when the light source module 20 is turned on can be efficiently radiated by the chassis 11. Further, if the chassis 11 is made of a material that reflects light, such as aluminum or iron, the chassis 11 also functions as a reflecting portion that reflects the emitted light from the light source module 20.

  The illumination cover 12 is provided so as to cover the chassis 11. For this reason, the projection member 15 and the light source module 20 mounted on the chassis 11 are accommodated in the interior of the illumination cover 12 to protect them. The illumination cover 12 transmits and diffuses the emitted light from the light source module 20. The lighting cover 12 is also referred to as a glove or shade provided in the lighting device 1. The illumination cover 12 can be formed from glass or a synthetic resin, for example. Since the LED 22 mounted on the light source module 20 generates a relatively large amount of heat when turned on, the illumination cover 12 is preferably formed from a heat resistant material. For example, milky white polycarbonate resin or acrylic is suitable as a constituent material of the lighting cover 12 because it is excellent in impact resistance, heat resistance, and light diffusibility.

  The protruding member 15 is fixed to the central portion of the chassis 11. The protruding member 15 is hollow and accommodates electronic components (not shown) such as a power supply circuit section of the light source module 20 inside. In the lighting device 1, the protruding member 15 protrudes from the center of the lower surface (surface facing the floor) of the chassis 11. As long as the protruding member 15 has a function capable of storing an electronic component or the like, various shapes and sizes are allowed. In addition, it is preferable that the protrusion member 15 is formed from a material with high heat dissipation. For example, the protruding member 15 can be made of aluminum, iron, resin, or the like. As a result, it is possible to efficiently dissipate heat generated from the electronic components (particularly the power supply circuit) installed inside the protruding member 15. Further, the surface of the protruding member 15 may be painted white or may be an uneven surface (a rough surface subjected to blasting). Thereby, the light which reached | attained the surface of the protrusion member 15 can be reflected.

  The light source module 20 is installed in the chassis 11 in parallel to the mounting surface. FIG. 3 is a plan view showing an arrangement state of the light source modules 20 in the lighting device 1, and shows an emission surface side of the light source modules 20. FIG. 3 shows a state where the illumination cover 12 and the center cover 13 in FIG. 2 are removed. Further, in FIG. 3, a diffusion member described later is also omitted.

  As shown in FIG. 3, the light source module 20 includes an LED substrate 21 and a plurality of LEDs 22 a and 22 b mounted on the LED substrate 21. The LEDs 22 a and 22 b emit light in a direction substantially perpendicular to the mounting surface of the LED substrate 21. In FIG. 3, the white LED 22 a and the light bulb color LED 22 b are mounted on the LED substrate 21. Thereby, the illuminating device 1 can illuminate white, a light bulb color, and those mixed colors. In the lighting device 1, four light source modules 20 are mounted in a square shape on the lower surface of the chassis 11 by fixing members such as screws 23.

  In FIG. 3, the white LEDs 22a and the bulb-colored LEDs 22b are provided at the same number and the same pitch, respectively. However, the LED mounted on the LED substrate 21 is not limited to this. That is, single color LEDs may be mounted on the LED substrate 21, or LEDs of different colors may be mounted at different pitches. Also, the number of LEDs can be arbitrarily set. In the following description, when the colors of the LEDs are not distinguished from each other, they are simply described as the LEDs 22.

  Here, based on FIG. 1, the characteristic structure of the illuminating device 1 is demonstrated. FIG. 1 is a cross-sectional view showing a light source module 20 and a diffusing member 30 provided in the illuminating device 1 and a partially enlarged view thereof, and is a diagram showing a cross section in a direction perpendicular to the mounting surface X of the illuminating device 1.

  The lighting device 1 according to the present embodiment is a so-called direct-lighting type lighting device in which the light source module 20 is provided in parallel to the mounting surface (installation surface) X of the lighting device 1. That is, the LED 22 is mounted on the light source module 20 so that the irradiation direction, that is, the optical axis of the LED 22 is substantially perpendicular to the mounting surface X of the lighting device 1. For this reason, it is difficult to satisfy the reduction in thickness of the lighting device 1 and the uniform irradiation from the lighting cover 12 at the same time, as described in [Problems to be solved by the invention] above.

  Therefore, the illumination device 1 includes a diffusion member 30 that is provided on the light emission direction side of the light source module 20 so as to be separated from the illumination cover 12 (not shown in FIG. 1) and diffuses the emitted light from the light source module 20. This is the biggest feature.

  That is, in the lighting device 1, the diffusing member 30 is provided on the optical path of the light source module 20. The diffusing member 30 is provided apart from the illumination cover 12 that houses the light source module 20 therein. Thereby, the emitted light from the light source module 20 (LED 22) is diffused by the diffusion member 30, and the diffused light reaches the illumination cover 12. Therefore, uniform light can be emitted from the illumination cover 12.

  That is, in the lighting device 1, even if the pitch of the LEDs 22 (LEDs 22a and 22b) in the light source module 20 is set wide, the distance from the light source module 20 to the lighting cover 12 is uniform from the lighting cover 12 without matching the pitch. Can be irradiated. Therefore, the distance from the light source module 20 to the illumination cover 12 can be set shorter than the pitch of the LEDs 22.

  As described above, in the lighting device 1, the light emitted from the light source module 20 is diffused by the diffusion member 30 before reaching the lighting cover 12. That is, the irradiation angle of the emitted light of the light source module 20 that has passed through the diffusing member 30 can be expanded. Therefore, in the direct-lighting illumination device 1, it is possible to irradiate uniform light from the illumination cover 12 while reducing the thickness of the illumination device 1. Depending on the type of the LED 22, the color may be different within the range of the emission angle of the LED 22. For example, there are cases where the emission angle is strong in the vicinity of the optical axis of the LED 22 and yellow as the emission angle increases with respect to the optical axis. Even in such a case, the emitted light of the LED 22 is mixed by the diffusing member 30, so that color spots on the light emitting surface of the illumination cover 12 can be prevented.

  The diffusing member 30 is not particularly limited as long as it has a function of diffusing emitted light from the light source module 20 (LED 22) in the light emitting direction (on the illumination cover 12 side). The diffusion member 30 can be made of, for example, polycarbonate, polyester, acrylic, PET (polyethylene terephthalate), or the like in which a diffusion material is dispersed.

  In FIG. 1, a diffusion sheet is illustrated as an example of the diffusion member 30. However, the shape of the diffusion member 30 is not limited to a sheet shape, and may be a plate-like member (diffusion plate).

  In the illuminating device 1, the position of the diffusing member 30 is not particularly limited as long as the diffusing member 30 is provided apart from the illumination cover 12 so as to diffuse the light emitted from the light source module 20.

  However, in the lighting device 1, out of the light source module 20 mounted on the chassis 11 installed on the mounting surface X of the lighting device 1, the emitted light from the LEDs 22 mounted on the outer edge (end) of the chassis 11 is It is difficult to reach the outer edge (end) of the illumination cover 12. As shown to (a) of FIG. 2, the outer edge part of the illumination cover 12 becomes dark easily, and the dark part D1 is easy to be formed.

  Therefore, the diffusing member 30 is preferably provided on the light emitting direction side of the LED 22 provided on the outer edge portion of the chassis 11. In other words, the diffusing member 30 is preferably provided so that light emitted from the LED 22 is diffused toward the dark portion D1 formed in the illumination cover 12. As described above, the diffusion member 30 is provided at least on the light emitting direction side of the LED 22 provided on the outer edge portion of the chassis 11, so that the emitted light from the LED 22 provided on the outer edge portion of the chassis 11 is transmitted by the diffusion member 30. Diffused. As a result, the light diffused by the diffusing member 30 reaches the outer edge portion (dark portion D1) of the illumination cover 12 that tends to be dark. Therefore, uniform light can be more reliably emitted from the illumination cover 12.

  Note that the diffusing member 30 is not necessarily provided on the entire surface of the light source module 20, and may be provided partially. That is, the light source module 20 may be provided with a non-mounting area where the diffusion member 30 is not mounted on the light emission direction side of the mounted LED 22. By providing the non-mounting region, it is possible to prevent the light from the LED 22 from being diffused and absorbed more than necessary, and to prevent the light amount emitted from the illumination cover 12 from being reduced.

  In the lighting device 1, if the distance between the light source module 20 or the diffusing member 30 and the lighting cover 12 is too close, the light source module 20 or the diffusing member 30 is reflected through the lighting cover 12. That is, the light from the LEDs 22 mounted on the light source module 20 appears in a dot shape on the illumination cover 12, and a uniform light emitting surface cannot be obtained. If the distance between the light source module 20 and the diffusing member 30 is too close, the diffusion effect of the light emitted from the light source module 20 by the diffusing member 30 is reduced. For this reason, it is preferable that the diffusion member 30 is provided apart from the light source module 20. That is, it is preferable that the diffusing member 30 is provided not only with the illumination cover 12 but also with the light source module 20. Thereby, the emitted light from the light source module 20 is sufficiently diffused by the diffusing member 30 and irradiated onto the illumination cover 12. Therefore, more uniform light can be emitted from the illumination cover 12. Further, it is possible to prevent the light source module 20 from being seen through the lighting cover 12, and a uniform light emitting surface can be obtained. Therefore, when the user looks at the lighting cover 12, the feeling of strangeness is eliminated.

  In the example of FIG. 1, the reflection member 40 is provided on the mounting surface of the LED 22 on the LED substrate 21 of the light source module 20. The reflecting member 40 is a diffusing member 30 that reflects the light reflected to the LED 22 side again and makes it incident on the diffusing member 30. If such a reflection member 40 is provided, even if the light emitted from the light source module 20 is reflected by the diffusion member 30, the reflection member 40 causes the light reflected by the diffusion member 30 to enter the diffusion member 30. . Therefore, it is possible to reduce the loss of the light emitted from the light source module 20 and the decrease in the amount of light reaching the illumination cover 12 due to entering the diffusing member 30.

  The reflecting member 40 can be set at an arbitrary position as long as the light reflected by the LED 22 is reflected again by the diffusing member 30 and can enter the diffusing member 30. That is, the reflecting member 40 is not limited to being installed on the LED 22 mounting surface of the LED substrate 21.

  The reflective member 40 may be a reflective sheet formed on the mounting surface of the LED 22 on the LED substrate 21, or a reflective layer in which a light reflective paint is applied to the mounting surface of the LED 22 on the LED substrate 21. Also good. That is, the reflection member 40 may be a reflection sheet provided as a separate body from the light source module 20, or may be a reflection layer provided (integrally) as a part of the light source module 20.

  On the other hand, FIG. 4 is a plan view of the light source module 20 and the diffusing member 30 in the lighting device 1. As described above, the diffusing member 30 is not necessarily provided on the entire surface of the light source module 20, and may be provided partially on a part of the light source module 20. That is, a non-mounting region where the diffusion member 30 is not mounted and a mounting region where the diffusion member 30 is mounted may be formed on the emission direction side of the light source module 20. For example, as shown in FIG. 4, the outer shape of the diffusing member 30 is substantially the same as the outer shape of the light source module 20. However, the opening 31 is formed in the diffusing member 30, and the LED 22 is not disposed in the opening 31 when the diffusing member 30 is disposed on the light emitting direction side of the light source module 20. Thereby, in the light emission direction of the light source module 20, a non-mounting region is formed in a region where the opening 31 is formed, and a mounting region is formed in other regions (regions where the opening 31 is not formed). As a result, in the non-mounting region (opening 31 portion), the light emitted from the LED 22 passes through the opening 31 without being diffused by the diffusing member 30 (without entering the diffusing member 30), and is directly illuminated. 12 is reached. Therefore, it is possible to reduce the loss of the light emitted from the LED 22 and the decrease in the amount of light reaching the illumination cover 12 due to entering the diffusing member 30. On the other hand, in the mounting region, the light emitted from the LED 22 is diffused by the diffusion member 30. Accordingly, the diffusion effect of the light emitted from the light source module 20 by the diffusing member 30 can be obtained. Therefore, by forming the non-mounting region and the mounting region, it is possible to irradiate uniform light from the illumination cover 12 while reducing the loss of light emitted from the LED 22 and the reduction in the amount of light.

  If the area of the non-mounting region (opening 31) is large, the loss of light emitted from the light source module 20 and the decrease in the amount of light can be reduced. On the other hand, if the area of the mounting region is small, the diffusion effect of the emitted light of the light source module by the diffusion member can be enhanced. Therefore, the area of the opening 31 formed in the diffusing member 30 may be determined according to the diffusion effect of the emitted light from the light source module 20 by the diffusing member 30.

  In FIG. 4, a non-mounting region is formed by the opening 31. However, the non-mounting region and the mounting region can be formed without forming the opening 31 in the diffusing member 30. For example, the opening 31 is not formed in the diffusing member 30, and the outer shape of the diffusing member 30 is made smaller than the outer shape of the light source module 20. Also in this case, the area where the light source module 20 is exposed is a non-mounting area, and the area where the diffusing member 30 is disposed is a mounting area. That is, it is possible to form the non-mounting region and the mounting region by installing the diffusion member 30 so that the light source module 20 is partially exposed.

  Further, the diffusion member 30 is partially provided only on the light emitting direction side of the LED 22 provided on the outer edge portion of the chassis 11, and the LED 22 of the light source module 20 located on the center side of the chassis 11 is set as the non-mounting region. Thus, it is possible to emit light from the outer edge portion of the illumination cover 12 that tends to be particularly dark using the minimum amount of the diffusing member 30 and reduce the loss of light from the LED 22 located on the center side of the chassis 11. can do. That is, it is possible to reduce the loss of light quantity of the lighting device 1 and obtain a uniform light emitting surface.

  On the other hand, in the mounting region of the light source module, not all the emitted light from the LED 22 is incident on the diffusing member 30, but a part of the emitted light is reflected by the diffusing member 30 toward the light source module 20. When the lighting device 1 includes the reflecting member 40, the light reflected by the diffusing member 30 is re-reflected by the reflecting member 40. As a result, when the light re-reflected by the reflecting member 40 goes to the non-mounting region, it passes through the opening 31 and directly reaches the illumination cover 12. On the other hand, when the light re-reflected by the light source module 20 goes to the mounting area, the light diffused by the diffusion member 30 reaches the lighting cover 12. Further, the light that is not incident on the diffusing member 30 and is reflected by the diffusing member 30 toward the light source module 20 side travels by repeating the same path. Therefore, it is possible to reduce the loss of the light emitted from the light source module 20 and the decrease in the amount of light reaching the illumination cover 12 due to entering the diffusing member 30.

  By the way, the diffusion member 30 is fixed to the light source module 20. The diffusion member 30 can be fixed by any method as long as the diffusion effect of the light emitted from the light source module 20 by the diffusion member 30 is not impaired. When the diffusing member 30 is made of a thin-film diffusing sheet, it is preferable to fix the diffusing sheet so that it does not bend more than necessary. Hereinafter, based on FIGS. 5-7, the fixing method of the diffusion member 30 is demonstrated. 5-7 is sectional drawing which shows the fixing method of the diffusion member 30 in the illuminating device 1. FIG.

  In the configuration of FIG. 5, a spacer 50 is provided for providing a certain distance between the LED 22 (light source module 20) and the diffusing member 30. Further, the diffusion member 30 is fixed by a screw (first fixing member) 61 through a spacer 50. Specifically, a fixing opening 23 is formed in the chassis 11, the LED substrate 21, and the reflecting member 40. The screw 61 passes through the opening 23 from the diffusion member 30. Accordingly, the LED substrate 21, the diffusing member 30, and the reflecting member 40 are fixed to the chassis 11 with one screw 61. Therefore, the work can be simplified and the number of parts can be reduced without requiring the work of fixing each separately. As described above, in the configuration of FIG. 5, since the spacer 50 is provided between the LED 22 (light source module 20) and the diffusion member 30, the deflection of the diffusion member 30 is prevented, and the distance between the LED 22 and the diffusion member 30. Can be kept constant. Further, the diffusion member 30 can be fixed to the LED substrate 21 (light source module 20) and the chassis 11 with the screws 61 while the diffusion member 30 is supported by the spacer 50.

  In the configuration of FIG. 6, a base screw (second fixing member) 62 for fixing the LED substrate 21 and the reflecting member 40 to the chassis 11 and a diffusion member set screw (third fixing member) 63 for fixing the diffusion member 30 are provided. Is provided. Specifically, the shaft portion 62 a of the base screw 62 passes through the opening 23. Thereby, the LED substrate 21, the diffusing member 30, and the reflecting member 40 are fixed to the chassis 11. The head 62 b of the base screw 62 is provided between the LED 22 (light source module 20) and the diffusing member 30. For this reason, the head 62b also functions as a spacer. For this reason, bending of the diffusing member 30 can be prevented and the distance between the LED 22 and the diffusing member 30 can be kept constant. it can. Further, a recess is formed in the head 62b, and the shaft 63a of the diffusion member set screw 63 is inserted into this recess. On the other hand, the head 63 b of the diffusion member set screw 63 is in contact with the lower surface (inner side surface) of the diffusion member 30. Thereby, the diffusing member 30 is fixed to the base screw 62. As described above, in the configuration of FIG. 6, the diffusion member set screw 63 that fixes the diffusion member 30 is fixed to the base screw 62 that fixes the LED substrate 21 (light source module 20) to the chassis 11. For this reason, when the diffusion member 30 is fixed, it is only necessary to align the fixing portion of the diffusion member 30 with respect to the base screw 62 (head 62b). Therefore, the diffusing member 30 can be easily fixed.

  In the configuration of FIG. 7, a screw (fourth fixing member) that fixes the diffusing member 30 to the LED substrate 21 is provided. Further, in the configuration of FIG. 7, the shape of the diffusing member 30 is different from the configurations of FIGS. 5 and 6. That is, in FIG. 5 and FIG. 6, the diffusion member 30 is flat, whereas in FIG. 7, the diffusion member 30 has a flange 30 a at a fixed portion. The collar part 30a is a part where the diffusing member 30 is recessed toward the LED substrate 21, and an opening through which the screw 64 passes is provided on the bottom surface of the collar part 30a. The screw 64 passes through the opening and the opening 23 provided on the bottom surface of the flange portion 30a from the diffusion member 30, and fixes the diffusion member 30 at the position of the flange portion 30a. Accordingly, the LED substrate 21, the diffusing member 30, and the reflecting member 40 are fixed to the chassis 11 by the screws 64. As described above, in the configuration of FIG. 7, the screw 64 fixes the diffusion member 30 and the reflection member 40 to the LED substrate 21 and the chassis 11 at the position of the flange portion 30 a formed on the diffusion member 30. The eaves part 30a is recessed toward the LED substrate 21 and is in contact with the reflecting member 40 formed on the LED substrate 21. Therefore, the flange portion 30a forms a step in the diffusing member 30 so that a certain distance can be provided without providing a spacer between the LED 22 (light source module 20) and the diffusing member 30, and the diffusing member 30 can be disposed on the LED substrate. 21 (light source module 20) and the chassis 11 can be fixed. Thereby, since it is not necessary to align the spacers, the fixing operation is facilitated. Furthermore, the number of parts can be reduced by the amount that the spacer is unnecessary. Moreover, since the screw 64 fixes the diffusion member 30 with the collar part 30a, the screw 64 does not protrude from the diffusion member 30 to the indoor side. Therefore, even when the LED 22 is provided in the vicinity of the opening 23, it is possible to reduce the light of the LED 22 from being shielded by the screw 64.

  In addition, in this embodiment, the illuminating device 1 provided with LED22 as a light source was demonstrated. However, the light source is not limited to the LED 22, and may be various light emitting elements such as a phosphor, an electroluminescence element, and a semiconductor light source. Moreover, what is necessary is just to set the color of a light source arbitrarily.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and the embodiments can be obtained by appropriately combining the technical means disclosed in the embodiments. The form is also included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Lighting apparatus 11 Chassis 12 Lighting cover 20 Light source module 22 LED (light source)
30 Diffusing member 30a ridge 40 reflecting member 50 spacer 61 screw (first fixing member)
62 Base screw (second fixing member)
63 Diffusion member set screw (third fixing member)
64 screws (fourth fixing member)
X Mounting surface

Claims (8)

In the lighting device installed on the mounting surface,
A light source module on which a plurality of light sources are mounted such that the irradiation direction is substantially perpendicular to the mounting surface;
A lighting cover that transmits light from the light source module;
An illuminating device comprising: a diffusion member provided on the light emission direction side of the light source module so as to be separated from the illumination cover and diffusing the emitted light from the light source module. Provided with a chassis installed on the mounting surface,
The light source module is installed in the chassis,
The lighting device according to claim 1, wherein the diffusion member is provided on a light emission direction side of a light source provided on an outer edge portion of the chassis.   The lighting device according to claim 1, wherein the diffusing member is provided apart from the light source module.   The lighting device according to claim 1, wherein the light source module has a non-mounting region where a diffusion member is not mounted on a light emission direction side of the light source.   The illumination apparatus according to claim 1, further comprising a reflection member that reflects light reflected by the diffusion member and makes the light incident on the diffusion member. A spacer provided between the light source module and the diffusion member;
The lighting device according to claim 1, further comprising: a first fixing member that fixes the diffusion member to the light source module via the spacer. A second fixing member for fixing the light source module to the chassis;
The lighting device according to claim 2, further comprising: a third fixing member that fixes the diffusion member to the second fixing member. A fourth fixing member for fixing the diffusion member to the light source module;
The lighting device according to any one of claims 1 to 5, wherein the diffusion member has a flange that is recessed toward the light source module at a fixing portion by the fourth fixing member.

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