JP2010103026A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire properly determining the lifetime thereof regardless of cause of deterioration. <P>SOLUTION: The luminaire includes: a body 2 for lighting a lamp 1; a transparent cover 3 for covering the lamp 1; an illuminance sensor 4 for measuring a transmittance of the cover 3; a lifetime determination circuit 7 for determining the lifetime of the cover 3 on the basis of a measurement result of the illuminance sensor 4; and a lifetime warning notification device 5 for notifying based on a determination result of the lifetime determination circuit 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a luminaire that can determine the life of a cover.

  In general, in a lighting fixture, a cover, an electronic component, or the like deteriorates with time, and when it reaches the end of its life, it cannot sufficiently function as a lighting fixture. For this reason, the technique for determining the lifetime of a lighting fixture and notifying a user is proposed.

  As such, for example, “the amount of light from the lamp, which is an integrated value of the intensity of light received by the detection means, having a fixture main body that holds and lights the lamp and a detection means that detects the light output of the lamp. And a notification unit for notifying that the instrument body is at the end of its life when the amount of light obtained by the light amount measurement unit reaches a predetermined value (for example, see Patent Document 1).

JP 2006-236716 A (page 3, FIG. 1)

  According to the technique disclosed in Patent Document 1, deterioration due to light can be determined. However, since the deterioration of the luminaire is caused not only by light but also by, for example, temperature, humidity, etc., the degree of deterioration greatly depends on environmental factors in which the luminaire is installed. Therefore, the life of the lighting fixture cannot be accurately determined only by the light received by the fixture body.

  The present invention has been made to solve the above-described problems, and provides a luminaire that can accurately determine the life regardless of the cause of deterioration.

  In the luminaire according to the present invention, a main body having a lighting circuit for lighting a lamp, a transmissive cover covering the lamp, a transmittance measuring means for measuring the transmittance of the cover, and the transmittance measurement A life determination unit that determines the life of the cover based on a measurement result of the unit, and a notification unit that performs notification based on the determination result of the life determination unit.

  The lighting fixture according to the present invention determines the life of the cover by measuring the transmittance of the cover. For this reason, the lifetime of the cover can be accurately determined regardless of the cause of deterioration.

Embodiment 1 FIG.
1 is a side view including a partially cutaway view of a lighting fixture 100 according to Embodiment 1 of the present invention, and FIG. 2 is a top view of the cover 3 shown in FIG. This is indicated by an imaginary line (two-dot chain line). In FIG. 2, the broken portion in FIG. 1 is schematically indicated by a line AA. FIG. 3 is a functional block diagram of the lighting fixture 100. In the first embodiment, a lighting apparatus 100 that is directly attached to the ceiling 1000 will be described as an example.

  1 to 3, the lamp 1 is attached to the lighting fixture 100, and the lighting fixture 100 includes a main body 2 having a lighting circuit 8 for lighting the lamp 1 and a cover 3 installed so as to cover the lamp 1. , An illuminance sensor 4 installed in the vicinity of the main body 2, a life warning notification device 5, and a life determination circuit 7 built in the main body 2. The illuminance sensor 4 is provided with a light receiving element 41 and a light receiving element 42 for receiving light emitted from the lamp 1.

  The lamp 1 is a lamp such as a fluorescent lamp, and is detachably attached to the main body 2. Further, as shown in FIG. 3, the lamp 1 is connected to an AC power source 20 through a lighting circuit 8 and is controlled by the lighting circuit 8 to perform a lighting operation.

  The main body 2 has a cylindrical outer shell, and holds the lamp 1 by a holder (not shown) provided therein. The lamp 1 and the main body 2 are electrically connected, and the lamp 1 is turned on by energizing the lamp 1 by the lighting circuit 8 built in the main body 2.

  The cover 3 is formed in a substantially circular dome shape. An opening 31 is opened at a substantially central position on the upper surface, and the periphery of the opening 31 is closed by a flange 32. The opening 31 has substantially the same shape as the cylindrical outer periphery of the main body 2. The cover 3 configured as described above is fixed to the main body 2 by a fixing tool (not shown) while fitting the lower portion of the main body 2 into the opening 31. When the cover 3 is attached to the main body 2, the lamp 1 is housed inside the cover 3. The cover 3 is made of milky white transparent resin. In the first embodiment and the following description, “milky white” does not limit the color of the cover 3 and defines that it is not significantly colored so as not to change the color of the light of the lamp 1. Is.

  In addition, in the collar portion 32 of the cover 3, the daylighting portion 6 is opened directly below the light receiving element 42 of the illuminance sensor 4. The daylighting unit 6 is formed in a size and shape that allows the light emitted by the lamp 1 (hereinafter sometimes referred to as lamp light) to pass through the daylighting unit 6 and be received by the light receiving element 42. In the first embodiment, the daylighting unit 6 is formed in a substantially circular shape. Since the daylighting unit 6 is in a state where the hole is opened and opened, the lamp light is not shielded, and it can be said that the transmittance of the lamp light is higher than other portions of the cover 3.

  The illuminance sensor 4 includes a light receiving element 41, a light receiving element 42, and a calculation unit 43. The transmittance measuring means of the present invention corresponds to the illuminance sensor 4, the first light receiving element corresponds to the light receiving element 41, and the second light receiving element corresponds to the light receiving element 42.

The light receiving element 41 receives the lamp light through the cover 3. That is, the light received by the light receiving element 41 is lamp light transmitted through the cover 3.
The light receiving element 42 is disposed directly above the daylighting unit 6 and receives the lamp light. Since the daylighting section 6 is open between the light receiving element 42 and the lamp 1 and there is no shielding object, the light receiving element 42 receives the lamp light as it is.
In addition, the light receiving element 41 and the light receiving element 42 output a signal corresponding to the illuminance of the received light to the calculation unit 43.

  The computing unit 43 calculates the transmittance of the cover 3 by acquiring the output signals of the light receiving element 41 and the light receiving element 42 and obtaining the ratio of the output value of the light receiving element 41 to the output value of the light receiving element 42. Then, the calculated transmittance is output to the life determination circuit 7.

As shown in FIG. 3, the life determination circuit 7 is connected to the illuminance sensor 4 and to the lighting circuit 8, the AC power supply 20, and the life warning notification device 5.
The life determination circuit 7 acquires the transmittance of the cover 3 measured by the illuminance sensor 4, and determines that the cover 3 has reached the life when the transmittance reaches a predetermined threshold. And when it determines with the cover 3 having reached the lifetime, the signal which instruct | indicates warning notification with respect to the lifetime warning notification apparatus 5 is output. In the first embodiment, the case where the life determination circuit 7 is built in the main body 2 will be described as an example. However, the mounting form is not limited, and it may be built in the illuminance sensor 4.

  The life warning notification device 5 is a notification device for notifying that the cover 3 has reached the end of its life in accordance with an instruction from the life determination circuit 7. The life warning notification device 5 may be either a visual notification device such as a pilot lamp or an audible notification device such as a buzzer, and has both a visual notification device and an audible notification device. It may be. When a visual notification device is used, notification can be performed by blinking or turning on the pilot lamp. Further, when an auditory notification device is used, notification can be performed by issuing a buzzer sound or a voice message. In addition, the alerting | reporting method is not restricted to these, A suitable thing can be used according to an installation environment or a user.

In the luminaire 100 configured as described above, when the usage period becomes longer, the cover 3 that was initially milky white deteriorates and turns yellow due to various factors such as light of the lamp 1, external light, temperature, and humidity. . When the cover 3 deteriorates and turns yellow, the transmittance of the lamp light in the cover 3 decreases.
Therefore, the output value of the light receiving element 42 that receives the lamp light through the cover 3 is small. On the other hand, since the light receiving element 41 receives the lamp light without passing through the cover 3, the output value does not change depending on the deterioration of the cover 3. The life determination circuit 7 calculates the transmittance of the cover 3 based on the output value of the light receiving element 42 and the output value of the light receiving element 41, and when the transmittance is reduced to a predetermined threshold value, the cover 3 has reached the life. It determines with a thing and controls the lifetime warning alerting | reporting apparatus 5, and alert | reports a warning.

  As described above, according to the lighting apparatus 100 according to the first embodiment, the transmittance in the cover 3 is calculated based on the illuminance of the lamp light received through the cover 3 and the lamp light received through the cover 3. The life of the cover 3 is determined. Therefore, the degree of yellowing due to the deterioration of the cover 3 can be directly detected, and the life of the cover 3 can be accurately determined regardless of the cause of the deterioration of the cover 3. Note that the illuminance of the lamp 1 gradually decreases as the lighting time increases, but even when the illuminance of the lamp 1 decreases, the life of the cover 3 can be appropriately determined.

  Further, when it is determined that the cover 3 has reached the end of its life, the life warning notification device 5 notifies the user. For this reason, the life of the cover 3 can be communicated to the user, and inspection and replacement of the cover 3 can be promoted. When the transmittance of the cover 3 decreases and the lifetime is reached, the interior of the room cannot be sufficiently irradiated even if the lamp 1 is turned on, and the original function of the lighting fixture cannot be exhibited. However, by notifying the user of the lifetime, it is possible to prevent the user from using the lighting apparatus 100 in a state where the transmittance of the cover 3 is reduced and the lamp light is not sufficiently supplied.

  Normally, when the cover 3 is further deteriorated, other components such as resin parts used for peripheral parts such as sockets of the lighting circuit 8 provided in the main body 2, electric parts, electric wires, etc. Deterioration of elements also progresses. Therefore, the lifetimes of the other components can be estimated at the same time based on the degree of deterioration of the cover 3.

Embodiment 2. FIG.
FIG. 4 is a side view including a partially cutaway view of the luminaire 200 according to Embodiment 2 of the present invention, and shows only the vicinity of the daylighting section 6. The second embodiment will be described with a focus mainly on differences from the first embodiment described above, and the same components are denoted by the same reference numerals.

  In FIG. 4, a transparent plate 61 is fitted in the daylighting unit 6, and the opening of the daylighting unit 6 is closed by the transparent plate 61. The transparent plate 61 is transparent and is made of a material such as glass or a specific resin that does not yellow or hardly yellow over time. In the present invention, “transparent” of the “transparent member” includes not only the state of being completely transparent without being turbid but also the state of not impairing the transmittance of the lamp light.

  In the lighting fixture 200 configured as described above, the light receiving element 41 receives lamp light through the cover 3, and the light receiving element 42 receives lamp light through the transparent plate 61. Here, since the transparent plate 61 is configured so as not to impair the transmittance of the lamp light, the illuminance of the light received by the light receiving element 42 is substantially the same as the illuminance of the lamp light. The light receiving element 41 and the light receiving element 42 output a signal corresponding to the received illuminance, and the life determination circuit 7 calculates the transmittance of the cover 3 based on the output values of both. Further, when the transmittance of the cover 3 reaches a predetermined threshold value, it is determined that the cover 3 has reached the end of life, and the life warning notification device 5 is controlled to perform warning notification.

  As described above, according to the lighting apparatus 200 according to the second embodiment, the transmittance of the cover 3 is calculated based on the illuminance of the lamp light received through the cover 3 and the lamp light received through the transparent plate 61. The life of the cover 3 is determined. Therefore, the same effect as in the first embodiment can be obtained. Moreover, since the lighting part 6 is obstruct | occluded by the transparent plate 61, it can prevent that an insect penetrate | invades into the inside of the cover 3 through the lighting part 6, and can prevent giving a user discomfort. it can.

  In the second embodiment, the case where the daylighting unit 6 is closed with the transparent plate 61 has been described as an example. However, instead of the transparent plate 61, a thin plate made of the same material as the cover 3 may be used. Alternatively, the thin plate portion may be formed by cutting a part of the thickness of the cover 3. Even if the material is the same as that of the cover 3, the transmittance of the lamp light increases if it is made thin. Therefore, the transmittance of the cover 3 is calculated based on the illuminance of the lamp light transmitted through the thin plate and the lamp light transmitted through the cover 3. be able to. Even if it does in this way, while being able to acquire the effect similar to this Embodiment 2, the design of the cover 3 is not impaired.

Embodiment 3 FIG.
FIG. 5 is a cross-sectional view of the lighting fixture 300 according to Embodiment 3 of the present invention, and FIG. 6 is a top view of the cover 3 shown in FIG. ). In addition, in FIG. 6, the cross-sectional location of FIG. 5 is represented by the BB line. In the third embodiment, differences from the first and second embodiments will be mainly described, and the same reference numerals are given to the same components.

  5 and 6, the collar portion 32 of the cover 3 is formed with a daylighting portion 6A that opens in a donut shape along the circumferential direction of the cover 3, and a donut-shaped transparent plate 61A is fitted into the daylighting portion 6A. It is. Therefore, the opening of the daylighting unit 6A is closed by the transparent plate 61A. The transparent plate 61A is transparent and is made of a material such as glass or a specific resin that does not yellow or hardly yellow over time. In FIG. 5, the transparent plate 61 </ b> A is shaded for explanation.

  The illuminance sensor 4A has the same function as the illuminance sensor 4 described in the first embodiment and the second embodiment described above, but the arrangement of the light receiving elements 41 and the light receiving elements 42 is different. Specifically, the light receiving element 41 is disposed on the outer side and the light receiving element 42 is disposed on the inner side with respect to the center position of the cover 3. The light receiving element 41 is arranged on a vertical line at a position where a part of the lamp 1 and a part of the cover 3 overlap each other, and can receive the lamp light through the cover 3. The light receiving element 42 is disposed on a vertical line where a part of the lamp 1 and the daylighting unit 6A overlap, and can receive the lamp light through the daylighting unit 6A. Further, the distance from the center position of the cover 3 to the light receiving element 42 is substantially the same as the distance from the center position of the cover 3 to the daylighting unit 6A.

  In the luminaire 300 configured as described above, the light receiving element 41 receives the lamp light through the cover 3 and the light receiving element 42 receives the lamp light through the transparent plate 61A, as in the second embodiment. . The light receiving element 41 and the light receiving element 42 output a signal corresponding to the received illuminance, and the life determination circuit 7 calculates the transmittance of the cover 3 based on the output values of both. Further, when the transmittance of the cover 3 reaches a predetermined threshold value, it is determined that the cover 3 has deteriorated, and the life warning notification device 5 is controlled to perform warning notification.

  Here, in order to accurately determine the life of the cover 3, the light receiving element 41 is disposed at a position where the lamp light transmitted through the cover 3 can be received, and the light transmitted through the daylighting unit 6A is received at a position where the light can be received. The element 42 needs to be arranged. However, the positional relationship in the circumferential direction between the cover 3 and the main body 2 is not necessarily determined uniquely. For example, there is a type that can rotate the cover 3 in the circumferential direction with the cover 3 attached to the main body 2.

  Even in such a case, according to the luminaire 300 according to the third embodiment, the daylighting unit 6A is formed along the circumferential direction of the cover 3, so that the positional relationship between the main body 2 and the cover 3 is maintained. Regardless, the daylighting portion 6A is positioned directly below the light receiving element 42, and the cover 3 is positioned directly below the light receiving element 41. That is, even if the cover 3 is rotated in the circumferential direction with respect to the main body 2, the light receiving element 41 is always positioned directly above the cover 3, and the light receiving element 42 is positioned directly above the daylighting portion 6A. can do.

  As described above, according to the lighting fixture 300 according to the third embodiment, the daylighting unit 6A is provided in a donut shape along the circumferential direction of the cover 3, and the distance from the center position of the cover 3 to the daylighting unit 6A is substantially the same. The light receiving element 42 is provided at the same distance. For this reason, even if the positional relationship between the cover 3 and the main body 2 is not fixed, such as a type in which the cover 3 is rotated and attached to the main body 2, the light receiving element 42 is directly above the daylighting portion 6A. Will be located. Therefore, since the light receiving element 42 can receive the lamp light transmitted through the daylighting unit 6A, the illuminance sensor 4 can accurately determine the life of the cover 3, and effects similar to those of the second embodiment described above. Can be obtained.

  Furthermore, when attaching the cover 3 to the main body 2, it is not necessary to align the light receiving element 42 and the daylighting unit 6 </ b> A, so that the attaching operation can be easily performed. Usually, since the lighting fixture 300 is attached to a high position such as a ceiling surface and the cover 3 is large, alignment at the time of attachment is often difficult. Even in such a case, according to the luminaire 300 according to the third embodiment, it is easy to attach the cover 3 to the main body 2.

  In addition, in this Embodiment 3, although the example in the case of providing the lighting part 6A in donut shape was demonstrated, the shape of the lighting part 6A is not restricted to this. For example, a fan shape that curves along the circumferential direction of the cover 3 may be used. Even if it does in this way, when attaching to the main body 2 to the cover 3, it is only necessary to roughly align, so the attaching operation can be easily performed.

Embodiment 4 FIG.
FIG. 7 is a side view including a partially cutaway view of a lighting fixture 400 according to Embodiment 4 of the present invention. The fourth embodiment will be described with a focus on differences from the first embodiment described above, and the same components are denoted by the same reference numerals.

  In FIG. 7, a rail 10 having a predetermined length is provided on the side surface of the main body 2 along the circumferential direction of the cover 3. Further, in the illuminance sensor 4, a sliding body (not shown) that is fitted to the rail 10 and is slidable on the side surface that is attached to the main body 2, and fixing for fixing the sliding body to the rail 10. A tool (not shown) is provided. The illuminance sensor 4 can be moved in the circumferential direction of the cover 3 on the side surface of the main body 2 by the sliding body and the rail 10 and can be fixed at an arbitrary position on the rail 10.

  In the lighting fixture 400 configured as described above, the illuminance sensor 4 can be moved and fixed so that the light receiving element 42 is positioned directly above the daylighting unit 6. Therefore, even if the positional relationship between the cover 3 and the main body 2 is not fixed as in the case where the cover 3 is rotated and attached to the main body 2, the light receiving element 42 is illuminated by moving the illuminance sensor 4. Arranged just above the part 6. For this reason, since the light receiving element 42 can receive the lamp light that has passed through the daylighting unit 6, the illuminance sensor 4 can accurately determine the life of the cover 3. Then, similarly to the above-described third embodiment, the cover 3 can be easily attached to the main body 2.

Embodiment 5 FIG.
In the first embodiment, the lifetime of the cover is determined using the illuminance sensor. In the fifth embodiment, an example in which the life of a cover is determined using a chromaticity sensor will be described.

  8 is a side view including a partially cutaway view of a lighting fixture 500 according to Embodiment 5 of the present invention, and FIG. 9 is a top view of the cover 3A shown in FIG. Is indicated by an imaginary line (two-dot chain line). In addition, in FIG. 9, the fracture | rupture location of FIG. 8 is represented with the outline CC line. The fifth embodiment will be described with a focus on differences from the first embodiment described above, and the same components are denoted by the same reference numerals.

  8 and 9, the lighting fixture 500 includes a cover 3 </ b> A, and a chromaticity sensor 9 is attached in the vicinity of the main body 2.

  The cover 3A is made of milky white transparent resin and is formed in a substantially circular dome shape. An opening 31A is opened at a substantially central position on the upper surface of the cover 3A, and the periphery of the opening 31A is closed by a flange 32A. The opening 31 </ b> A has substantially the same shape as the cylindrical outer periphery of the main body 2. Unlike the first embodiment, the cover 3A is not provided with a daylighting unit. The cover 3A configured as described above is fixed to the main body 2 by a fixing tool (not shown) while fitting the lower portion of the main body 2 into the opening 31A. When the cover 3A is attached to the main body 2, the lamp 1 is housed inside the cover 3A.

  The chromaticity sensor 9 is a reflective photoelectric sensor including a light emitting element 91, a light receiving element 92, and a calculation unit 93. The main body 2 includes a life determination circuit 12 connected to the chromaticity sensor 9. The light emitting element 91 emits signal light P, and the light receiving element 92 receives the reflected light Q reflected from the cover 3A. The signal light P emitted from the light emitting element 91 is light of a specific color (for example, red, blue, green, or a combination thereof) that is easily reflected by the cover 3A, and may be appropriately determined according to the color of the cover 3A. it can. The light receiving element 92 outputs a signal corresponding to the amount of received reflected light Q to the calculating unit 93. The calculation unit 93 calculates the chromaticity of the cover 3 </ b> A based on the output signal of the light receiving element 92. Then, the calculated chromaticity is output to the life determination circuit 12.

  The life determination circuit 12 stores the chromaticity of the reflected light Q when the cover 3A is not deteriorated as a reference value, and the life determination circuit 12 determines the chromaticity of the cover 3A measured by the chromaticity sensor 9. A reference value stored in advance is compared, and when the difference between the two exceeds a predetermined threshold, it is determined that the cover 3A has reached the end of its life due to yellowing due to deterioration.

  In the luminaire 500 configured as described above, when the usage period becomes longer, the cover 3A that was initially milky white deteriorates and turns yellow due to various factors such as light of the lamp 1, external light, temperature, and humidity. . When the cover 3A deteriorates and turns yellow, the color of the reflected light Q received by the light receiving element 92 changes and the output value of the light receiving element 92 also changes. Therefore, the life determination circuit 12 determines the chromaticity and reference value of the cover 3A. Can be determined that a color change has occurred in the cover 3A. The life determination circuit 12 determines that the cover 3A has reached the life when the difference between the output value of the cover 3A and the reference value exceeds a predetermined threshold, and controls the life warning notification device 5 to control the life warning notification device 5. Warning notification.

  As described above, according to the lighting fixture 500 according to the fifth embodiment, the color change of the cover 3A is detected using the chromaticity sensor 9, and the life of the cover 3A is determined. For this reason, it is possible to accurately determine the deterioration of the cover 3A regardless of the cause of the deterioration of the cover 3A. Further, when it is determined that the cover 3 </ b> A has deteriorated, the life warning notification device 5 performs notification. For this reason, it is possible to notify the user of the deterioration of the cover 3A, and it is possible to prompt inspection and replacement of the cover 3A. Therefore, it is possible to prevent the user from using the lighting apparatus 100 in a state where the transmittance of the cover 3A is lowered and the lamp light is not sufficiently supplied.

  In addition, the chromaticity sensor described in the fifth embodiment and the illuminance sensor described in the first to third embodiments may be used together to determine the life of the cover. That is, the color of the cover is determined by the chromaticity sensor, the transparency of the cover is determined by the illuminance sensor, and the life of the cover is determined by both determination results. By doing in this way, the lifetime of a cover can be determined more correctly.

  In the fifth embodiment, the case where the chromaticity sensor 9 is a reflective photoelectric sensor has been described as an example. However, the configuration of the chromaticity sensor 9 is not limited to this, and the chromaticity of the cover 3 can be measured. Anything is acceptable. For example, a transmissive photoelectric sensor can be used, and the same effect can be obtained.

Embodiment 6 FIG.
FIG. 10 is a functional block diagram of a lighting fixture 600 according to Embodiment 6 of the present invention. 10 has substantially the same configuration as that of FIG. 3 described in the first embodiment, except that the operation time measurement circuit 11 is provided and the life determination circuit 7 is connected to the operation time measurement circuit 11. Is different. Hereinafter, a description will be given focusing on differences from the first embodiment.

  The operation time measurement circuit 11 is connected to the lighting circuit 8 and the life determination circuit 7 and is connected to the AC power supply 20. The operation time measuring circuit 11 measures the accumulated operation time of the lamp 1 by detecting a signal when the lighting circuit 8 lights the lamp 1. The lamp 1 needs to be replaced when the illuminance decreases with the passage of time and the lifetime (for example, 6000 hours) elapses, but the operation time measuring circuit 11 continues regardless of whether the lamp 1 has been replaced or not. Count the accumulated operating time. Then, when the accumulated operation time exceeds a predetermined time (for example, 40000 hours) stored in advance, energization to the life determination circuit 7 and the illuminance sensor 4 is started.

In the lighting fixture 600 configured as described above, when the lamp 1 is turned on, the operation time measuring circuit 11 measures the accumulated operation time of the lamp 1. When the accumulated operation time has not reached the predetermined time, the life determination circuit 7 and the illuminance sensor 4 are not energized, and the life determination circuit 7 and the illuminance sensor 4 do not operate.
When the accumulated operation time reaches a predetermined time, the operation time measurement circuit 11 starts energizing the life determination circuit 7 and the illuminance sensor 4. Since the light receiving element 41 and the light receiving element 42 receive the lamp light and output a signal corresponding to the received lamp light, the life determination circuit 7 determines the life of the cover 3 based on the output value. The life determination operation and the warning notification operation when the life is reached are the same as those described in the first embodiment.

  As described above, according to the lighting fixture 600 according to the sixth embodiment, the life of the cover 3 is not determined until the cumulative operation time of the lamp 1 reaches a predetermined time, and the cumulative operation time exceeds the predetermined time. In addition, the life of the cover 3 is determined. For this reason, the operation time of the illuminance sensor 4 and the life determination circuit 7 can be shortened, and the power consumption can be reduced. In addition, the same effect as described in the first embodiment can be obtained.

  Further, the sixth embodiment can be combined with any of the above-described second to fifth embodiments, and the same effect can be obtained.

  In the above description, the life warning notification device is provided to warn about the life of the cover, but the warning notification may be performed by the light of the lamp. For example, when the cover reaches the end of its life, the user can be alerted by flashing the lamp several times first when turning on the lamp. If it does in this way, it can be set as a simple structure which does not need a separate lifetime warning information apparatus, and can obtain the same effect as the above.

  Further, in the above description, the lighting fixture having a cover formed in a substantially circular dome shape, which is directly attached to the ceiling surface or the like, has been described as an example, but the shape of the cover and the method of attaching the lighting fixture are described here. It is not limited. The present invention can also be applied to, for example, a hanging type lighting fixture or a lighting fixture having a cover having a square shape or other various shapes, and similar effects can be obtained.

It is a side view including the partially broken view of the lighting fixture which shows Embodiment 1 of this invention. It is a top view of the cover which shows Embodiment 1 of this invention. It is a functional block diagram of the lighting fixture which shows Embodiment 1 of this invention. It is a side view including the partially broken view of the lighting fixture which shows Embodiment 2 of this invention. It is sectional drawing of the lighting fixture which shows Embodiment 3 of this invention. It is a top view of the cover which shows Embodiment 3 of this invention. It is a side view including the partially broken view of the lighting fixture which shows Embodiment 4 of this invention. It is a side view including the partially broken view of the lighting fixture which shows Embodiment 5 of this Embodiment. It is a top view of the cover which shows Embodiment 5 of this Embodiment. It is a functional block diagram of the lighting fixture which shows Embodiment 6 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Lamp, 2 Main body, 3 Cover, 4 Illuminance sensor, 5 Life warning notification apparatus, 6 Daylighting part, 7 Life judgment circuit, 8 Lighting circuit, 41 Light receiving element, 42 Light receiving element, 43 Calculation part, 100 Lighting fixture.

Claims (11)

A main body with a lighting circuit for lighting the lamp;
A transparent cover covering the lamp;
A transmittance measuring means for measuring the transmittance of the cover;
Life determination means for determining the life of the cover based on the measurement result of the transmittance measurement means;
An illuminating device comprising: an informing unit that performs an informing based on a determination result of the lifetime determining unit. The cover includes a daylighting portion formed so that light transmittance is higher than other parts,
The transmittance measuring means includes
First light receiving means for receiving light emitted from the lamp through the cover and outputting a signal corresponding to the illuminance;
Second light receiving means for receiving light emitted from the lamp through the daylighting unit and outputting a signal corresponding to the illuminance;
The lighting apparatus according to claim 1, further comprising a calculation unit that calculates the transmittance of the cover based on outputs of the first light receiving unit and the second light receiving unit. The lighting device according to claim 2, wherein the daylighting unit is an opening provided in the cover. The lighting apparatus according to claim 3, further comprising a transparent member that closes the opening. The lighting device according to claim 2, wherein the daylighting unit is a thin plate unit in which the thickness of the cover is reduced. The lighting device according to any one of claims 2 to 5, wherein the daylighting portion is provided with a predetermined length in a circumferential direction of the cover. The lighting device according to any one of claims 1 to 6, wherein the transmittance measuring means is provided so as to be movable in a circumferential direction of the cover. Comprising a time measuring means for measuring the cumulative operation time of the lamp,
The lighting apparatus according to any one of claims 1 to 7, wherein the transmittance measuring unit and the life determining unit start to operate after the time measuring unit measures a predetermined time. A main body for lighting the lamp,
A transparent cover covering the lamp;
Chromaticity measuring means for measuring the chromaticity of the cover;
Life determination means for determining the life of the cover based on the measurement result of the chromaticity measurement means;
An illuminating device comprising: an informing unit that performs an informing based on a determination result of the lifetime determining unit. The chromaticity measuring means includes
A light emitting means for emitting signal light to the cover;
A light receiving means for receiving the signal light reflected or transmitted through the cover and outputting a signal corresponding to the received light amount;
The lighting apparatus according to claim 8, further comprising: an arithmetic unit that calculates chromaticity of the cover based on an output of the light receiving unit. Comprising a time measuring means for measuring the cumulative operation time of the lamp,
The lighting device according to claim 9 or 10, wherein the chromaticity measuring unit and the life determining unit start to operate after the time measuring unit times a predetermined time.

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