JP2006294352A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire capable of improving uniformity of luminance of a translucent panel without luminance unevenness on the translucent panel. <P>SOLUTION: The luminaire 1 comprises an apparatus main body 2, a straight tube type fluorescent lamp as a lamp held on the apparatus main body 2, a translucent panel 4 for transmitting light by covering the straight tube type fluorescent lamp 3, a diffusion cover 5 installed by corresponding to a front surface of the straight tube type fluorescent lamp 3 between the straight tube type fluorescent lamp 3 and the translucent panel 4 for diffusing light directly from the straight tube type fluorescent lamp 3. The diffusion cover 5 is fixed on the apparatus main body 2 in a predetermined mounting position so as to uniform light from the straight tube type fluorescent lamp 3 and emit the light from the translucent panel 4 by engaging a projection part 52 provided on the diffusion cover 5 with a hole for fixation 23 provided on the apparatus main body 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lighting fixture.

  Conventionally, lighting fixtures used as lighting in a living room, lighting fixtures used as signs, signboards, etc., are the fixture body, a plurality of straight tubular lamps held by the fixture body, and the lamp covering the lamp. And a milky white translucent panel that transmits the light. In such a luminaire, if the distance from the lamp to the translucent panel is too short with respect to the distance between the lamps, or the distance between the lamps is too wide with respect to the distance from the lamp to the translucent panel, A lamp image appears on the light panel, resulting in uneven brightness on the light-transmitting panel.

  Therefore, in order to prevent uneven brightness in the translucent panel without increasing the number of lamps, there is known a luminaire provided with a diffusion cover for diffusing light from the lamp between the lamp and the translucent panel. (For example, refer to Patent Document 1).

  The lighting fixture described in Patent Document 1 limits the light emitted to the front of the lamp with a diffusion cover, thereby leveling the light emitted from the lamp to the translucent panel, and thereby from the lamp to the translucent panel. Therefore, even if the distance is shortened, luminance unevenness does not occur in the translucent panel.

In addition, the diffusion cover described in Patent Document 1 is obtained by printing black ink on a half-cylindrical elastic transparent plate attached to the peripheral surface of the lamp in the form of a dotted line, and by pressing it on the front side of the lamp, It is elastically deformed and is applied to the entire lamp in the longitudinal direction. The black ink of the diffusion cover is the densest in the central part in the circumferential direction, and becomes rougher as it reaches both side edges in the circumferential direction. The central part in the circumferential direction of the diffusion cover faces the front of the translucent panel. It is attached to the lamp so that it is in the correct posture. The light from the lamp is shielded by the black ink of the diffusion cover, and the light emitted in front of the lamp is limited, whereby the light emitted from the lamp to the translucent panel is homogenized.
JP-A-10-64318

  However, in the luminaire described in Patent Document 1 described above, since the diffusion cover is elastically deformed and attached to the lamp, the mounting posture is not uniquely determined. For this reason, the diffusion cover is mounted in a position that deviates from a predetermined mounting position (position in which the central portion in the circumferential direction faces the front of the translucent panel). It may deviate from the predetermined mounting orientation due to the cause. Since the black ink of the diffuser cover is the densest in the central part in the circumferential direction, if the diffuser cover deviates from the predetermined mounting posture in this way, the light irradiated from the lamp to the translucent panel is homogenized. Therefore, uneven brightness occurs in the translucent panel. Further, since the diffusion cover is attached to the entire lamp in the longitudinal direction, the heat dissipation effect is poor and the lamp output may be reduced.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lighting fixture that can increase the luminance uniformity of the light-transmitting panel without causing uneven brightness in the light-transmitting panel. To do.

  In order to achieve the above object, a first aspect of the present invention provides a lighting fixture including a fixture main body and a translucent panel that covers a lamp held by the fixture main body and transmits light, between the lamp and the translucent panel. The diffuser cover is installed corresponding to the front of the lamp and diffuses the direct light from the lamp, and the diffuser cover is provided on the fixture body so that the light from the lamp is emitted from the translucent panel in a uniform manner. It is fixed with the mounting posture.

  According to a second aspect of the present invention, in the lighting fixture according to the first aspect, the diffusion cover is fixed to the fixture body via a fixing bracket provided on the fixture body.

  According to a third aspect of the present invention, in the lighting fixture according to the first aspect, the diffusion cover is fixed to the fixture main body by engaging a protrusion provided in the diffusion cover with a fixing hole provided in the fixture main body. Is.

  According to a fourth aspect of the present invention, in the lighting apparatus according to any one of the first to third aspects, the diffusion cover has a horseshoe shape in cross section and a shape that opens the end of the lamp. is there.

  According to the first aspect of the present invention, the light emitted from the lamp to the light transmissive panel is homogenized by the diffusion cover between the lamp and the light transmissive panel. Therefore, even if the distance from the lamp to the light transmissive panel is shortened, luminance uniformity of the light transmissive panel can be increased without causing luminance unevenness in the light transmissive panel, thereby reducing the thickness of the lighting fixture. And energy efficiency can be improved. Further, in the configuration having a plurality of lamps, even if the number of lamps is reduced and the interval between the lamps is widened, the luminance uniformity of the translucent panel is increased without causing uneven luminance in the translucent panel. Can save energy.

  In addition, since the diffusion cover is fixed to the instrument body in a predetermined mounting posture, the diffusion cover is not mounted in a posture deviating from the predetermined mounting posture, and the diffusion cover that has already been mounted. Will not deviate from the predetermined mounting position due to maintenance or vibration. For this reason, the light irradiated from the lamp to the translucent panel can be more reliably leveled, and the luminance uniformity of the translucent panel can be further increased.

  According to the second aspect of the present invention, since the diffusion cover is fixed to the instrument main body via the fixing bracket provided on the instrument main body, the diffusion cover can be easily attached and detached.

  According to the invention of claim 3, since the diffusion cover is fixed to the instrument body by engaging the protrusion of the diffusion cover with the fixing hole of the instrument body, the diffusion cover can be easily attached and detached.

  According to the invention of claim 4, since the end portion of the lamp is opened from the diffusion cover, the heat dissipation effect is high, and the reduction of the lamp output can be prevented. In addition, since the diffusion cover has a shape in which the end portions of the lamps are opened, even in a configuration in which the ends of the plurality of lamps are overlapped to connect the plurality of lamps in the longitudinal direction, a diffusion cover is provided for each lamp. It is possible.

  Hereinafter, a lighting apparatus according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2 show the configuration of a lighting fixture. The lighting fixture 1 is a fixture that is attached to an indoor ceiling or wall surface and used as indoor lighting, or is installed outdoors and used as a sign or a signboard. The lighting fixture 1 is held by the fixture body 2 and the fixture body 2. A straight tube fluorescent lamp 3, a translucent panel 4 that transmits light from the straight tube fluorescent lamp 3, and a diffusion cover 5 that equalizes the luminance of the translucent panel 4. . The luminaire 1 emits light from the straight tube fluorescent lamp 3, diffuses the light with the diffusion cover 5, and emits the light from the translucent panel 4.

  The instrument main body 2 includes a fluorescent lamp socket 21 for connecting and holding the straight tube fluorescent lamp 3, a fluorescent lamp back reflector 22 for reflecting light emitted from the straight tube fluorescent lamp 3, and a diffusion cover 5. And a fixing hole 23 for fixing to. The fluorescent lamp socket 21 is provided so as to protrude from the front surface of the instrument body 2. The fluorescent lamp back reflector 22 is installed between the fluorescent lamp sockets 21 on the front surface of the fixture body 2 (that is, the back side of the straight tube fluorescent lamp 3), and the central portion projects along the direction in which the fluorescent lamp sockets 21 are arranged. It has a mountain shape. The fixing holes 23 are formed at a plurality of locations on the front surface of the instrument body 2.

  The straight tube fluorescent lamp 3 is detachably connected to and held by the fluorescent lamp socket 21 of the fixture body 2, and is disposed in front of the fluorescent lamp back reflector 22 on the front side of the fixture body 2. The translucent panel 4 is made of, for example, a milky white translucent resin, and is detachably attached to the instrument body 2 so as to cover the straight tube fluorescent lamp 3.

  The diffusion cover 5 is installed between the straight tube fluorescent lamp 3 and the translucent panel 4, and the light from the straight tube fluorescent lamp 3 (that is, the direct light from the straight tube fluorescent lamp 3 and the reflection plate 3). Diffused light). The diffusion cover 5 is made of transparent acrylic, and has a light diffusion part 51 that diffuses light and a protrusion 52 that fixes the diffusion cover 5 to the instrument body 2. Further, the diffusion cover 5 has a shape covering the straight tube fluorescent lamp 3, its length is shorter than that of the straight tube fluorescent lamp 3, and its cross-sectional shape is a horseshoe shape.

  The light diffusing portion 51 is formed by, for example, black dot printing for diffusing light, and the dot printing is the largest in the circumferential central portion of the diffusion cover 5, and both side edges in the circumferential direction. The dots are getting smaller as they go to. Therefore, the diffusion cover 5 has the highest light diffusivity at the central portion in the circumferential direction, and the light diffusivity decreases as it reaches both side edges in the circumferential direction. The protrusions 52 are provided at a plurality of locations on both edges in the circumferential direction of the diffusion cover 5.

  In the diffusion cover 5 having such a configuration, the protrusion 52 is engaged with the fixing hole 23 of the instrument body 2 so that a predetermined mounting posture (a portion having the highest light diffusion degree (a central portion in the circumferential direction) is transparent. It is fixed to the instrument main body 2 in a posture facing the front of the optical panel 4. In a state where the diffusion cover 5 is fixed to the instrument body 2 in a predetermined mounting posture, a gap is formed between the straight tube fluorescent lamp 3 and the diffusion cover 5, and both ends of the straight tube fluorescent lamp 3 are located at the diffusion cover 5. Is released from. Further, as described above, the light diffusivity of the diffusion cover 5 is highest at the central portion in the circumferential direction and becomes lower as it reaches both side edges in the circumferential direction. In the state fixed to the light, the light from the straight tube fluorescent lamp 3 is leveled by the diffusion cover 5 and emitted from the translucent panel 4.

  FIG. 3 shows a structure for attaching the diffusion cover 5 to the instrument body 2. The diffusion cover 5 is attached to the instrument body 2 in the following manner with the translucent panel 4 removed and the straight tube fluorescent lamp 3 attached. First, the vicinity of the protrusion 52 of the diffusion cover 5 is picked by hand from both outer sides of the diffusion cover 5, and the protrusion 52 is used for fixing the instrument body 2 with the protrusion 52 slightly displaced to the inner side of the diffusion cover 5. Insert into hole 23. Then, with the protrusion 52 inserted into the fixing hole 23, the hand holding the diffusion cover 5 is released. Thereby, the protrusion 52 of the diffusion cover 5 returns from the displaced state to the original state, is engaged with the instrument body 2, and the diffusion cover 5 is fixed to the instrument body 2 in a predetermined mounting posture.

  The diffusion cover 5 fixed to the instrument body 2 in this way is maintained in its mounting posture thereafter. Further, the diffusion cover 5 is removed by gripping the vicinity of the protrusion 52 of the translucent cover 5 fixed to the instrument body 2 from both sides by hand, and slightly shifting the protrusion 52 to the inside of the diffusion cover 5; This is done by extracting the protrusion 52 from the fixing hole 23 of the instrument body 2.

  According to the lighting fixture 1 having such a configuration, the light-transmitting panel 4 is irradiated from the straight-tube fluorescent lamp 3 by the diffusion cover 5 installed between the straight-tube fluorescent lamp 3 and the translucent panel 4. Light is homogenized. Therefore, luminance unevenness does not occur in the translucent panel 4, and the uniformity of the luminance of the translucent panel 4 can be increased.

  Moreover, since the diffusion cover 5 is fixed to the instrument main body 2 in a predetermined mounting posture by engaging the projection 52 of the diffusion cover 5 with the fixing hole 23 of the instrument main body 2, the diffusion cover 5 is predetermined. The diffusion cover 5 that is already attached is not displaced from the predetermined attachment posture during maintenance or due to vibration or the like. Therefore, the light diffusing portion 51 of the diffusing cover 5 and the translucent panel 4 do not deviate from a predetermined positional relationship, and the light irradiated to the translucent panel 4 from the straight tube fluorescent lamp 3 is more reliably homogenized. And the brightness uniformity of the translucent panel 4 can be further increased.

  Further, the diffusion cover 5 can be attached to the instrument body 2 simply by picking the diffusion cover 5 by hand and inserting the protrusion 52 into the fixing hole 23, and at the same time holding the diffusion cover 5 by hand to fix the protrusion 52 to the fixing hole 23. Since the diffusion cover 5 can be removed from the instrument body 2 simply by removing it from the instrument body, a tool is not required to attach and remove the diffusion cover 5, and the diffusion cover 5 can be easily attached and removed.

  Furthermore, since both ends of the straight tube fluorescent lamp 3 are opened from the diffusion cover 5, the heat radiation effect can be enhanced to prevent a decrease in lamp output, and from the dark portions at both ends of the straight tube fluorescent lamp 3. The luminance uniformity of the translucent panel 4 can be further increased without the emitted light being diffused. Further, the light emitted to the back side of the straight tube fluorescent lamp 3 is reflected to the light transmissive panel 4 side by the fluorescent lamp back reflector 22, whereby the luminance of the light transmissive panel 4 can be improved.

  FIG. 4 shows another mounting structure of the diffusion cover 5. The diffusion cover 5 is formed with an engagement hole 53 in place of the protrusion 52 in the configuration of FIGS. 1 to 3, and the instrument body 2 is formed in the fixing hole 23 in the configuration of FIGS. Instead, a fixing bracket 24 is provided. The fixing bracket 24 is elastic and has an engagement protrusion 24 a that is engaged with the engagement hole 53 of the diffusion cover 5. Other configurations of the diffusion cover 5 and the instrument body 2 are the same as the configurations of FIGS. 1 to 3.

  The diffusion cover 5 is engaged with the engagement protrusion 53a of the fixing bracket 24 in the engagement hole 53, so that a predetermined mounting posture (the central portion in the circumferential direction is the same as in the configuration of FIGS. 1 to 3). It is fixed to the instrument body 2 in a posture facing the front of the translucent panel 4.

  The diffusion cover 5 is attached to the instrument body 2 as follows. First, the gap between the fixing brackets 24 is slightly widened by hand, and the diffusion cover 5 is inserted between the fixing brackets 24. Then, release the hand that has widened the interval between the fixing brackets 24 and adjust the position of the diffusion cover 5 while being inserted between the fixing brackets 24, and the engagement holes 53 of the diffusion cover 5 and the fixing bracket 24 are adjusted. Are aligned with the engaging protrusion 24a. As a result, the fixing bracket 24 that has been spread out returns to its original state, and the engagement protrusion 24 a of the fixing bracket 24 is engaged with the engagement hole 53 of the diffusion cover 5. Is fixed to the instrument body 2 in a predetermined mounting posture. Further, the diffusion cover 5 is removed by slightly expanding the distance between the fixing brackets 24 by hand and removing the diffusion cover 5.

  According to such a mounting structure of the diffusion cover 5, the diffusion cover 5 is fixed to the instrument body 2 in a predetermined mounting posture by engaging the fixing bracket 24 of the instrument body 2 with the engagement hole 53 of the diffusion cover 5. 1 to 3, the diffusion cover 5 is not attached in a posture deviating from a predetermined attachment posture, and the already attached diffusion cover 5 is maintained. There is no deviation from the predetermined mounting posture due to time or vibration. Therefore, similarly to the configuration of FIGS. 1 to 3, the luminance uniformity of the translucent panel 4 (see FIGS. 1 and 2) can be further increased.

  Also, according to the mounting structure of the diffusion cover 5, as in the configuration of FIGS. 1 to 3, no tool is required for mounting and removing the diffusion cover 5, and it is easy to mount and remove the diffusion cover 5. is there. In addition, when the brightness unevenness of the translucent panel 4 is worrisome with the existing lighting fixture which is not equipped with the diffusion cover 5, the fixing metal fitting 24 is attached to the fixture main body of the existing lighting fixture with an iron plate screw etc. 5 may be attached.

  FIG. 5 shows an application example of the lighting fixture 1. This luminaire 1 is an optical panel unit that uses two straight tube fluorescent lamps 3 and has a translucent panel 4 having a length L of 630 mm and an appliance thickness T of 80 mm. The two straight tube fluorescent lamps 3 are arranged in parallel in two rows, and the interval (lamp pitch) S between them is 275 mm. The two straight tube fluorescent lamps 3 are FHF16w lamps. A fluorescent lamp back reflector 22 is installed on the back side of each straight tube fluorescent lamp 3, and a fluorescent lamp reflector 27 is installed between the two straight tube fluorescent lamps 3.

  The translucent cover 5 is installed for each straight tube fluorescent lamp 3 corresponding to the front surface of each straight tube fluorescent lamp 3. Each translucent cover 5 has the same configuration as that shown in FIGS. 1 to 3, and, similarly to the configuration shown in FIGS. 1 to 3, by engaging the projection 52 of the diffusion cover 5 with the instrument body 2, It is fixed to the instrument main body 2 in a predetermined mounting posture (a posture in which the portion having the highest light diffusivity faces the front of the translucent panel 4).

  FIG. 6 shows another application example of the luminaire 1. This lighting fixture 1 is a sign board using three straight tube fluorescent lamps 3, a translucent panel 4 having a length L of 1100 mm, a translucent panel 4 having a width W of 659 mm, and an instrument thickness T of 100 mm. is there. The three straight tube fluorescent lamps 3 are arranged in parallel in three rows, and each of the straight tube fluorescent lamps 3 is held obliquely by the instrument body 2. A fluorescent lamp back reflecting plate 22 is installed on the back side of each straight tube fluorescent lamp 3, and a fluorescent lamp reflecting plate 27 is installed between the straight tube fluorescent lamps 3.

  The translucent cover 5 is installed for each straight tube fluorescent lamp 3 corresponding to the front surface of each straight tube fluorescent lamp 3. Each translucent cover 5 has the same configuration as that shown in FIGS. 1 to 3, and, similarly to the configuration shown in FIGS. 1 to 3, by engaging the projection 52 of the diffusion cover 5 with the instrument body 2, It is fixed to the instrument main body 2 in a predetermined mounting posture (a posture in which the portion having the highest light diffusivity faces the front of the translucent panel 4).

  FIG. 7 shows still another application example of the luminaire 1. This luminaire 1 is a signboard using a large number of straight tube fluorescent lamps 3. A number of straight tube fluorescent lamps 3 are arranged in parallel in the vertical and horizontal directions. Each of the straight tube fluorescent lamps 3 is held obliquely by the instrument main body 2 and is connected in the longitudinal direction of the straight tube fluorescent lamp 3 with the ends overlapped. Between each of the straight tube fluorescent lamps 3, a reflector 27 between fluorescent lamps is installed.

  The translucent cover 5 is installed for each straight tube fluorescent lamp 3 corresponding to the front surface of each straight tube fluorescent lamp 3. Each translucent cover 5 has the same configuration as that shown in FIGS. 1 to 3, and, similar to the configuration shown in FIGS. 1 to 3, the translucent cover 5 is attached to the instrument body 2 with both ends of the straight tube fluorescent lamp 3 being opened. Fixed. Since the diffusion cover 5 is fixed to the instrument body 2 with both ends of the straight tube fluorescent lamp 3 open, the end portions of the straight tube fluorescent lamp 3 are overlapped with each other in this manner. Also in the structure which connects 3 in a longitudinal direction, it is possible to provide a diffusion cover 5 for each straight tube fluorescent lamp 3.

  FIG. 8 shows still another application example of the lighting fixture 1. This luminaire 1 is a signboard using a plurality of straight tube fluorescent lamps 3, a translucent panel 4 having a length of 1250 mm, a translucent panel 4 having a width W of 870 mm, and an instrument thickness T of 70 mm. . The plurality of straight tube fluorescent lamps 3 are arranged in parallel, the interval (lamp pitch) S thereof is 275 mm, and the distance D from the straight tube fluorescent lamp 3 to the translucent panel 4 is 26 mm. A fluorescent lamp back reflector 22 is installed on the back side of each straight tube fluorescent lamp 3, and a fluorescent lamp reflector 27 is installed between the two straight tube fluorescent lamps 3.

  The translucent cover 5 is installed for each straight tube fluorescent lamp 3 corresponding to the front surface of each straight tube fluorescent lamp 3. Each of the translucent covers 5 has the same configuration as that shown in FIG. 4. Like the configuration shown in FIG. 4, a predetermined mounting posture (the portion having the highest light diffusivity is a translucent panel) via the fixing bracket 24. 4) and fixed to the instrument body 2.

  FIGS. 9A and 9B show luminance distribution images of the translucent panel 4 in a configuration without the diffusion cover 5, and FIGS. 9C and 9D show the transmission in the configuration of the present invention having the diffusion cover 5. The brightness distribution image of the light panel 4 is shown. 9A, 9B, 9C, and 9D, the color shading corresponds to the brightness of the translucent panel 4, and the lighter the color, the higher the brightness, and the darker the color, the lower the brightness. ing.

  In the configuration without the diffusion cover 5, the interval S between the straight tube fluorescent lamps 3 does not satisfy the relationship of S ≦ 1.5D with respect to the distance D from the straight tube fluorescent lamp 3 to the translucent panel 4. (That is, if the distance S between the straight tube fluorescent lamps 3 is excessively widened or the distance D from the straight tube fluorescent lamps 3 to the translucent panel 4 is too short, exceeding the relationship of S ≦ 1.5D) The luminance distribution of the translucent panel 4 is as shown in FIGS. FIG. 9A shows the case without the fluorescent lamp back reflection 22, and FIG. 9B shows the case with the fluorescent lamp back reflection plate 22.

  In the case where there is no fluorescent lamp back reflection 22 shown in FIG. 9A, the luminance of the areas 41a, 41b, 41c is highest corresponding to the front surface of the straight tube fluorescent lamp 3, and the areas 41a, 41b, 41c The brightness difference with the surrounding area 42 becomes large, and the image of the straight tube fluorescent lamp 3 appears. 9B, the luminance of the regions 43a, 43b, and 43c is highest corresponding to the front surface of the straight tube fluorescent lamp 3, and the regions 43a and 43b are also provided. , 43c and their peripheral area 44 become large, and the image of the straight tube fluorescent lamp 3 appears.

  As described above, in the configuration without the diffusion cover 5, the image of the straight tube fluorescent lamp 3 is formed on the translucent panel 4 in the case where the fluorescent lamp back reflection 22 is not provided and in the case where the fluorescent lamp back reflector 22 is provided. 41 emerges, resulting in uneven brightness in the translucent panel 4. Therefore, in the configuration not including the diffusion cover 5, if importance is attached to the uniformity of the luminance distribution of the translucent panel 4, the interval S between the straight tube fluorescent lamps 3 is reduced so as to satisfy the relationship of S? 1.5D (that is, Either increase the number of straight tube fluorescent lamps 3 or increase the distance D from the straight tube fluorescent lamp 3 to the translucent panel 4 so that the relationship of S? 1.5D is satisfied (that is, the luminaire is thickened). )Must.

  On the other hand, in the configuration of the present invention including the diffusion cover 5, the distance S between the straight tube fluorescent lamp 3 and the distance D from the straight tube fluorescent lamp 3 to the light transmitting panel 4 does not include the diffusion cover 5. 9 (that is, even if the relationship of S ≦ 1.5D is not satisfied), the luminance distribution of the translucent panel 4 is as shown in FIGS. FIG. 9C shows the case without the fluorescent lamp back reflection 22, and FIG. 9D shows the case with the fluorescent lamp back reflection plate 22.

  In the case where there is no fluorescent lamp back reflection 22 shown in FIG. 9C, the luminance of the region 45 near the center of the translucent panel 4 is highest, but the regions 46 a and 46 b corresponding to the front surface of the straight tube fluorescent lamp 3. , 46c and the peripheral region 47 are almost eliminated, and the image of the straight tube fluorescent lamp 3 does not appear. In addition, in the case where the fluorescent lamp back reflector 22 is provided as shown in FIG. 9D, the luminance of the regions 48a, 48b, 48c is highest corresponding to the front surface of the straight tube fluorescent lamp 3, but the regions 48a, 48b. , 48c and the peripheral area 49 thereof become small, and the image of the straight tube fluorescent lamp 3 does not appear.

  As described above, in the configuration of the present invention provided with the diffusion cover 5, the straight tube fluorescent lamp 3 is attached to the translucent panel 4 in the case where there is no fluorescent lamp back reflection 22 and in the case where the fluorescent lamp back reflector 22 is provided. The image does not appear and brightness unevenness does not occur in the translucent panel 4. Therefore, in the configuration of the present invention including the diffusion cover 5, even if the interval S between the straight tube fluorescent lamps 3 is increased beyond the relationship of S? 1.5D (that is, the number of the straight tube fluorescent lamps 3 is reduced). Even if the distance D from the straight tube fluorescent lamp 3 to the translucent panel 4 is shortened beyond the relationship of S? 1.5D (that is, the lighting fixture is made thin), the translucent panel The uniformity of the luminance distribution of 4 can be increased.

  In addition, this invention is not restricted to the structure of the said embodiment, A various deformation | transformation is possible. For example, the structure for fixing the diffusion cover 5 to the instrument body 2 is not limited to the structure of the above-described embodiment, and the installation posture of the diffusion cover 5 is uniquely a predetermined installation posture (the portion with the highest light diffusion degree is the translucent panel). 4), and the diffusion cover 5 may have any fixing structure as long as the diffusion cover 5 does not deviate from a predetermined mounting posture. Further, the diffusion cover 5 is not limited to a horseshoe shape covering the straight tube fluorescent lamp 3, and may have any shape as long as it is a shape interposed between the straight tube fluorescent lamp 3 and the translucent panel 4. May be. Further, the light diffusion portion 51 of the diffusion cover 5 is not limited to the one formed with black dot printing, and has a function of diffusing light, such as one formed with fine irregularities. It only has to be.

The perspective view which fractured | ruptured partially which shows the structure of the lighting fixture which concerns on one Embodiment of this invention. Sectional drawing which shows the structure of the lighting fixture. Sectional drawing which shows the attachment structure of the diffusion cover of the lighting fixture. Sectional drawing which shows another attachment structure of the diffusion cover of the same lighting fixture. The perspective view which fractured | ruptured partially which shows the application example of the lighting fixture. (A) is the partially broken front view which shows another application example of the lighting fixture, (b) is the same sectional side view. The partially broken front view which shows another application example of the lighting fixture. The sectional side view which shows another application example of the same lighting fixture. (A) is an image figure which shows the luminance distribution of the translucent panel in the case without a fluorescent lamp back reflector in the structure which does not have a diffusion cover, (b) is the luminance distribution of the translucent panel with the same fluorescent lamp back reflector. (C) is an image diagram showing the luminance distribution of the translucent panel when there is no fluorescent lamp back reflector in the configuration of the present invention having a diffusion cover, and (d) is the case with the same fluorescent lamp back reflector. The image figure which shows the luminance distribution of a translucent panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Appliance main body 3 Straight tube | pipe type fluorescent lamp 4 Translucent panel 5 Diffusion cover 21 Fluorescent lamp socket 22 Fluorescent lamp back reflector 23 Fixing hole 24 Fixing bracket 24a Engaging protrusion 27 Reflector between fluorescent lamps 51 Light Diffusion part 52 Projection part 53 Engagement hole

Claims (4)

In a lighting fixture comprising a fixture body and a translucent panel that covers a lamp held by the fixture body and transmits light,
A diffusion cover is provided between the lamp and the translucent panel so as to correspond to the front surface of the lamp and diffuses direct light from the lamp,
The diffusing cover is fixed to the fixture body in a predetermined mounting posture so that light from the lamp is emitted from the translucent panel in a uniform manner.   The lighting device according to claim 1, wherein the diffusion cover is fixed to the fixture body via a fixing bracket provided on the fixture body.   The lighting device according to claim 1, wherein the diffusion cover is fixed to the fixture body by engaging a protrusion provided on the diffusion cover with a fixing hole provided in the fixture body. . The lighting device according to any one of claims 1 to 3, wherein the diffusion cover has a horseshoe shape in cross-section and a shape that opens an end of the lamp.

Images