JP5307568B2 - Light source for bulb-type lighting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bulb-shaped illumination light source allowing a user to easily recognize, without touching the casing, that the temperature of the casing is so high that the user may get burned by touching it. <P>SOLUTION: The bulb-shaped illumination light source 100 includes: a light-emitting module 150; a lighting unit 130 for lighting the emitting module 150; a housing 101 to which the light-emitting module 150 and the lighting unit 130 is attached; a thermally-deformable member 173 that is disposed within the housing 101, takes a first shape when the housing 101 is in a first temperature, and is deformed into a second shape when the housing is in a second temperature which is higher than the first temperature; and a temperature information display unit 170 that takes a first display mode when the thermally-deformable member 173 is in the first shape, shifts to a second display mode, when the thermally-deformable member 173 is deformed to the second shape, in response to the deformation, and is fitted to the housing 101 in such a state that it is visible from outside the housing 101 that the temperature information display unit has shifted into the second display mode. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a light source for bulb-shaped illumination, and more particularly, to a technology for applying a light emitting module such as an LED module and notifying a user when a casing becomes hot due to abnormal heat generation of the light emitting module or the like.

In the above-mentioned light source for bulb-shaped illumination, a heat sink is provided in the housing to optimally dissipate the heat emitted from the LED module or lighting unit. However, some LEDs short-circuit in the LED module and overcurrent flows. If abnormal heat generation occurs due to a partial failure of the lighting unit or the lighting unit, the housing may become abnormally hot. Therefore, for example, in the illumination light source according to Patent Document 1, when abnormal heat generation occurs, the external power supply and the lighting unit are electrically disconnected using a fuse or the like to prevent the casing from becoming abnormally high temperature. doing.
JP 2007-207508 A

However, the casing just before the fuse functions is quite hot if not abnormal, and it is dangerous to touch it carelessly. Also, the housing immediately after the fuse has functioned has not cooled down and is dangerous if touched carelessly. However, it is not easy to recognize such an abnormally high temperature state without touching the housing.
The present invention has been made in view of the above-described problems, and is a bulb-shaped illumination that can easily recognize that there is a dangerous temperature that may cause burns when the casing is touched without touching the casing. An object is to provide a light source.

A light source for light bulb-shaped illumination according to the present invention includes a light emitting module, a lighting unit for lighting the light emitting module, a casing to which the light emitting module and the lighting unit are attached, and the casing. In the case of the first temperature, the shape is the first shape, and when the second temperature is higher than the first temperature, the heat-deformable member deforms to the second shape, and the heat-deformable member has the first shape. In the case of the above, when the thermally deformable member is deformed to the second shape, the second display form is changed according to the deformation, and the first display form is changed to the second display form. And a temperature information display unit attached to the housing in a state visible from the outside of the housing, from the first display form of the temperature information display unit to the second display form The change is that the temperature of the housing is high. Display mode according to the be one that changes briefly also characterized viewable der Rukoto from the outside of the housing the rate of change.

  According to the above configuration, when the heat-deformable member has the first shape, the first display form is changed. When the heat-deformable member is changed to the second form, the second display form is changed according to the deformation. Because the temperature information display unit is attached to the housing in such a way that the change can be seen from the outside of the housing, it is a dangerous temperature that may cause burns when touching the housing. It can be easily recognized without touching the case. Moreover, the display form of the temperature information display unit is changed according to the deformation of the heat-deformable member due to the change in the temperature of the housing, and since it does not depend on electrical control, Even if an abnormality occurs, it can be recognized that the temperature is dangerous if the casing is touched. Furthermore, it can be realized at a relatively low cost using only simple members.

The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
[First Embodiment]
<Outline configuration>
FIG. 1 is a cross-sectional view illustrating a configuration of a light source for bulb-shaped illumination according to the first embodiment. 2 is a cross-sectional perspective view taken along line AA in FIG.

As shown in FIGS. 1 and 2, a light bulb shaped illumination light source (hereinafter simply referred to as illumination light source) 100 according to the first embodiment includes a case 110, a heat sink 120, a lighting unit 130, a base 140, a light emitting module 150, A globe 160 and a temperature information display unit 170 are provided.
The case 110 has a cylindrical shape, and a base 140 (for example, an E-type base) is attached to one end side, and a heat sink 120 is attached to the other end side so as to close the opening.

The heat sink 120 has a substantially columnar shape with a short height, and has a substantially rectangular opening 123 that penetrates from one circular surface 121 (outer surface 121) to the other circular surface 122 (inner surface 122). Have
The housing 101 of the illumination light source 100 includes a case 110 and a heat sink 120. The outer surface of the housing 101 includes an outer peripheral surface 111 of the case 110, and an outer surface 121 and a side peripheral surface 124 of the heat sink 120. It consists of The inside of the case 110 (the inside of the casing 101) can be viewed from the outside of the casing 101 through the window 123 of the heat sink 120.

The lighting unit 130 is housed inside the case 110 and is configured by a circuit board 131 and various electronic components 132 and has a function of supplying power supplied through the base 140 to the light emitting module 150. Note that the wiring for supplying power is not shown because it is not an essential part of the present invention.
The light emitting module 150 is mounted on the outer surface 121 of the heat sink 120 via a bonding material 153 and includes a mounting substrate 151 and a light emitting unit 152. The light emitting unit 152 emits light upon receiving power supply from the lighting unit 130. Specifically, the light emitting unit 152 is molded with a silicone resin containing a blue LED and a yellow phosphor material formed so as to contain the blue LED. It is composed of the body.

The globe 160 is fixed to the heat sink 120 so as to cover the light emitting module 150.
The temperature information display unit 170 is disposed in the case 110 and in the vicinity of the window 123 on the inner side surface 122 of the heat sink 120.
<Detailed configuration>
Next, the illumination light source 100 will be described in detail with a focus on the temperature information display unit 170 which is a main part. FIG. 3 is a perspective view showing the temperature information display unit. 4A and 4B are diagrams for explaining changes in the display form of the temperature information display unit. FIG. 4A shows the first display form, and FIG. 4B shows the second display form. FIG.

As shown in FIG. 3, the temperature information display unit 170 includes a warning member 171, a frame member 172, and a heat deformable member 173, and changes from the first display form to the second display according to the deformation of the heat deformable member 173. By changing the form, the user is visually warned that the temperature is dangerous if the outer surface of the housing 101 is touched.
The warning member 171 has a substantially square plate shape, and one main surface 174 is painted in red, for example, and serves as a warning surface.

  The frame member 172 is a member that slidably holds the warning member 171, and is parallel to the warning member 171 on the main surface side opposite to the one main surface 174 (hereinafter, warning surface 174) of the warning member 171. A plate-shaped pedestal 175 arranged, a pair of opposed long rails 176 and 177 provided on the outer peripheral edge of the pedestal 175 so as to surround three sides of the warning member 171, and the long rails 176 and 177. And a short rail 178 that connects one end of each. A pair of opposing side edge portions 179 and 180 of the warning member 171 are fitted in the rail grooves 181 and 182 of the long rails 176 and 177, and the warning member 171 slides along the rail grooves 181 and 182. . In the plate-like base 175, the main surface 183 on the warning member 171 side has a color different from the warning surface 174 of the warning member 171, for example, white.

As shown in FIG. 1, the temperature information display unit 170 is fixed to the inner side surface 122 in a state where the warning surface 174 of the warning member 171 is parallel to the inner side surface 122 of the heat sink 120. It slides along the rail grooves 181 and 182 of the pair of long rails 176 and 177 while keeping parallel to the inner surface 122 of the heat sink 120.
The heat-deformable member 173 is a long plate-like member bent into a “<” shape, and one end 184 thereof is fixed to a side surface 185 of the warning member 171 opposite to the short rail 178, The other end 186 is fixed to a columnar fixing portion 187 erected on the main surface 183 on the warning member 171 side of the plate-like base 175 of the frame member 172.

  The heat-deformable member 173 is positioned in the vicinity of the heat sink 120 because the temperature information display unit 170 is attached to the inner surface 122 of the heat sink 120. Therefore, the heat of the heat sink 120 is likely to propagate (it is easy to be affected by the heat sink 120 with respect to the temperature). The temperature of the member 173 also decreases. The heat-deformable member 173 is made of, for example, a NiTi-based bi-directional shape memory alloy. Therefore, when the casing 101 is at or below the first temperature, it is in the first shape, and at or above the second temperature. Is reversibly deformed into the second shape. When the heat deformable member 173 has the first shape, the temperature information display unit 170 is in the first display form, and when the heat deformable member 173 has the second shape, the temperature information display unit 170 has the second display. It is a form.

  More specifically, as shown in FIG. 4A, when the side peripheral surface 124 of the heat sink 120 is at the first temperature, the heat-deformable member 173 has a first angle α1 that has a small folding angle. Since the first distance L1 has a short distance between the end portions, the one end portion 184 of the heat-deformable member 173 is close to the fixing portion 187 of the frame member 172, and the warning member 171 is close to the fixing portion 187. 1 position. When the warning member 171 is in the first position, the temperature information display unit 170 is in the first display form, and in this state, the position of the warning member 171 coincides with the position of the window 123 indicated by a two-dot chain line. Therefore, the warning surface 174 cannot be visually recognized from the outside of the casing 101 (outside surface 121 side of the heat sink 120) through the window portion 123. In this case, since the main surface 183 on the warning member 171 side of the plate-like pedestal 175 can be seen from the window portion 123, the inside of the window portion 123 looks white, which is the color of the main surface 183.

  On the other hand, as shown in FIG. 4B, when the side peripheral surface 124 of the heat sink 120 is at the second temperature, the heat-deformable member 173 has a first angle α2 having a large folding angle and a distance between the end portions. Has a long second distance L 2, the one end 184 of the heat-deformable member 173 is away from the fixing portion 187 of the frame member 172, and the warning member 171 is in a second position far from the fixing portion 187. The When the warning member 171 is in the second position, the temperature information display unit 170 is in the second display form, and in this state, the position of the warning member 171 and the position of the window 123 indicated by a two-dot chain line coincide with each other. The warning surface 174 can be visually recognized from the outside of the casing 101 (the side of the outer surface 121 of the heat sink 120) through the window 123. In this case, the inside of the window 123 looks red, which is the color of the warning surface 174.

  As shown in FIG. 1, the light emitting module 150 side of the heat sink 120 is covered with a globe 160, but the globe 160 is formed of a translucent or transparent material, and the warning member 171 is shown in FIG. ), The warning surface 174 can be visually recognized from the outside of the globe 160. In order to make the warning surface 174 easier to see, a part of the globe 160 (a portion where the warning surface 174 can be seen through the window portion 123) is semi-transparent or transparent with high transparency, and the remaining portion is more than the above portion. Alternatively, a translucent structure with low transparency may be used. Alternatively, the globe 160 may be omitted, and in that case, the window 123 may be closed with a transparent or translucent member so that dust or the like does not enter the housing 101 through the window 123.

  In the above, the first temperature is, for example, a temperature that is safe even if the user touches the side peripheral surface 124 of the heat sink 120, and is, for example, about 85 ° C. or less. Thus, when the side peripheral surface 124 of the heat sink 120 is about 85 ° C. or less (when the heat sink 120 is about 85 ° C. or less), the heat-deformable member 173 disposed in the vicinity of the heat sink 120 is also about 85 ° C. or less. Therefore, the heat-deformable member 173 may be designed so as to have a first shape as shown in FIG.

  The second temperature is, for example, a dangerous temperature when the user touches the side peripheral surface 124 of the heat sink 120. For example, the first temperature is about 85 ° C., and the rise characteristic of the shape memory alloy is, for example, about In the case of 10 ° C., the second temperature may be about 95 ° C. or higher, for example. Thus, when the side peripheral surface 124 of the heat sink 120 is about 95 ° C. or higher (when the heat sink 120 is about 95 ° C. or higher), the heat-deformable member 173 disposed in the vicinity of the heat sink 120 is also about 95 ° C. or higher. Therefore, the heat-deformable member 173 may be designed so as to have a second shape as shown in FIG.

  Further, when the side peripheral surface 124 of the heat sink 120 is at a temperature between the first temperature and the second temperature, that is, in the above example, more than about 85 ° C. and less than about 95 ° C., The deformable member 173 is also higher than about 85 ° C. and lower than about 95 ° C. The heat-deformable member 173 has a folding angle between the first angle α1 and the second angle α2 in the temperature range, and the end-to-end distance is the first distance L1 and the second distance α2. And a distance between the first shape shown in FIG. 4 (a) and the second shape shown in FIG. 4 (b). Accordingly, only a part of the position of the warning member 171 and the position of the window portion 123 indicated by a two-dot chain line coincide with each other, and the outside of the casing 101 (from the outer surface 121 side of the heat sink 120) through the window portion 123. Only a part of the warning surface 174 is visible. In this case, both the red color which is the color of the warning surface 174 and the white color which is the color of the main surface 183 of the pedestal 175 on the warning member 171 side can be seen from the window portion 123.

  As the temperature of the heat-deformable member 173 increases, the folding angle increases and the end-to-end distance increases. Therefore, when the temperature of the side peripheral surface 124 of the heat sink 120 is higher than the first temperature and lower than the second temperature, the warning member 171 moves from the position shown in FIG. ) For a while, and the ratio of red (warning surface 174) to the entire window 123 increases.

  In the illumination light source 100 as described above, when an abnormal heat is generated in the illumination light source 100 due to an overcurrent flowing in the light emitting module 150 or a failure of the lighting unit 130, the outer surface of the housing 101 is abnormal. May become very hot. In such a case, touching the outer surface of the housing 101 in an attempt to remove the illumination light source 100 from the lamp may cause a burn or the like, which is dangerous. In particular, among the outer surfaces of the housing 101, the side peripheral surface 124 of the heat sink 120 is a portion that is highly likely to be touched by the user, and is also a portion that tends to be hot.

  However, the illumination light source 100 looks white in the window 123 when the first temperature is safe even if the side peripheral surface 124 of the heat sink 120 is touched, but the side peripheral surface 124 of the heat sink 120 is touched. When the dangerous second temperature is reached, the inside of the window 123 looks red. That is, when the temperature becomes dangerous when touched, the color in the window 123 that can be seen through the globe 160 changes from white to red. Therefore, if the inside of the window 123 is red, the user can see the color in the window 123 by explaining in the product manual that the outer surface of the housing 101 is hot and dangerous to touch. It is possible to easily determine whether or not the temperature is dangerous when the housing 101 is touched. That is, when the user touches the illumination light source 100, the user checks whether a red portion is visible through the globe 160. If the user can touch the housing 101 as safe if not visible, the red portion is visible. Then, it can be determined that the housing 101 should not be touched until it is no longer visible.

Since the heat variable member 173 is made of a bidirectional shape memory alloy, it is reversibly deformed into the first shape and the second shape. Accordingly, the warning member 171 also moves reversibly between the first position and the second position, and the temperature information display unit 170 also changes reversibly between the first display form and the second display form. That is, even if the side peripheral surface 124 of the heat sink 120 is at the second temperature and the heat variable member 173 has the second shape, the temperature of the side peripheral surface 124 of the heat sink 120 is subsequently lowered to the first temperature. For example, the shape of the heat variable member 173 returns to the first shape. Therefore, the warning member 171 also returns from the second position to the first position in accordance with the deformation of the heat-deformable member 173, and the inside of the window portion 123 also returns from red to white. Thus, since the warning member 171 reversibly moves in accordance with the reversible deformation of the heat-deformable member 173, the side peripheral surface 124 of the heat sink 120 once becomes the second temperature, and the warning member 171 becomes the second temperature. The function of the temperature information display unit 170 is not impaired even if it is moved to the position.
[Second Embodiment]
<Outline configuration>
FIG. 5 is a cross-sectional view showing a configuration of a light source for bulb-shaped illumination according to the second embodiment. 6 is a cross-sectional perspective view taken along line BB in FIG.

  As shown in FIGS. 5 and 6, the illumination light source 200 according to the second embodiment includes a case 110, a heat sink 220, a lighting unit 130, a base 140, a light emitting module 150, a globe 260, and a plurality of temperature information display units 270. Is provided. In addition, the same code | symbol as the light source 100 for illumination which concerns on 1st Embodiment is attached | subjected to the component which is common in the light source 100 for illumination which concerns on 1st Embodiment in the light source 200 for illumination which concerns on 2nd Embodiment. Description of the components is omitted.

  The heat sink 220 has a substantially cylindrical shape with a short height dimension, and is spaced from the circular surface 221 (outer surface 221) to the other at equal intervals along the circumferential direction on the outer peripheral edge of the outer surface 221 of the heat sink 220. The four windows 223 to 226 having a substantially arc shape in the opening shape penetrating to the circular surface 222 (inner surface 221). The light emitting module 150 is mounted at a substantially central position of the outer surface 221 of the heat sink 220.

  The housing 201 of the illumination light source 200 includes a case 110 and a heat sink 220, and the outer surface of the housing 201 includes an outer peripheral surface 111 of the case 110, an outer surface 221 and a side peripheral surface 127 of the heat sink 220. It consists of The inside of the case 110 (the inside of the casing 201) can be viewed from the outside of the casing 201 through the windows 223 to 226 of the heat sink 220.

The opening diameter of the globe 260 is slightly smaller than the outer side surface 221 of the heat sink 220, covers the light emitting module 150, and is fixed to the heat sink 220 so as not to cover the outer peripheral edge portion of the outer side surface 221 of the heat sink 220. That is, the window portions 223 to 226 of the heat sink 220 protrude outside the globe 260.
One temperature information display unit 270 is disposed inside the case 110 and in the vicinity of the four windows 223 to 236 on the inner surface 222 of the heat sink 220.
<Detailed configuration>
Next, the illumination light source 200 will be described in detail with a temperature information display unit 270 as a main part. FIG. 7 is a perspective view showing the temperature information display unit. 8A and 8B are diagrams for explaining changes in the display form of the temperature information display unit. FIG. 8A shows the first display form, and FIG. 8B shows the second display form. FIG.

As shown in FIG. 7, the temperature information display unit 270 includes a warning member 271, a holder member 272, and a heat deformable member 273, and changes from the first display form to the second display according to the deformation of the heat deformable member 273. By changing the shape, the user is visually warned that the temperature is dangerous if the outer surface of the housing 201 is touched.
The holder member 272 includes a plate-like pedestal 274, a rotation shaft 276 erected on one main surface 275 of the pedestal 274, and a long rectangular frame 277 provided on the main surface 275. A warning member 271 is rotatably supported on the rotation shaft 276, and a partition plate 278, a coil spring 279, a heat deformable member 273, and a rod-shaped member 280 are accommodated in the frame body 277. .

  The warning member 271 has a substantially semi-cylindrical shape, and is disposed such that the semicircular surface 281 is parallel to the base 274 of the holder member 272 and the flat side surface 282 is opposed to the frame body 277. The semicircular surface 281 of the warning member 271 has two regions 283 and 284 having different colors and / or patterns. For example, one region 283 is a warning surface 283 painted in red and the other region 284 is blue. It is a painted non-warning surface 284.

  The partition plate 278 is not fixed to the frame body 277 and bisects the internal space of the frame body 277 in the longitudinal direction (XY direction in FIG. 7), and is close to the warning member 271 in the bisected space. A coil spring 279 is disposed in the outer space, and a heat deformable member 273 is disposed in the space farther from the warning member 271. The coil spring 279 is arranged so as to bias the partition plate 278 in the X direction.

  The heat-deformable member 273 is a coil-shaped member made of a unidirectional shape memory alloy. When the side peripheral surface 227 of the heat sink 220 is at the first temperature, the partition plate 278 urged by the coil spring 279 is used. However, when the side peripheral surface 227 of the heat sink 220 reaches the second temperature, the partition that extends in the XY direction due to its shape memory characteristics and is biased by the coil spring 279 is formed. The plate 278 is pushed back in the Y direction to form the second shape. On the other hand, since the heat-deformable member 273 is made of a unidirectional shape memory alloy, the heat-deformable member 273 cannot be shrunk depending on the characteristics of the heat-deformable member 273. The coil spring 279 is pressed by the partition plate 278 by the action of the coil spring 279 and contracts to have a second shape. That is, due to the spring action of the coil spring 279 and the shape memory characteristic of the heat deformable member 273, the partition plate 278 moves reversibly in the XY direction, and the heat deformable member 273 has the first shape and the second shape. And reversibly deform.

  In this way, the heat-deformable member 273 cannot be deformed from the second shape to the first shape only by the function of the member itself (it cannot be reversibly deformed from the first shape to the second shape). However, it can change from the second shape to the first shape by combining with another member (in this embodiment, the coil spring 279) (reversibly deformable from the first shape to the second shape). ) Can be configured. In addition, if the heat-deformable member 273 is made of a bidirectional shape memory alloy and both ends thereof are fixed to the frame body 277 and the partition plate 278, reversible deformation is possible without the coil spring 279. is there.

  The rod-shaped member 280 is arranged along the XY direction so as to pass through the frame body 277 and the partition plate 278 and to pass through the coils of the coil spring 279 and the heat deformable member 273. Since the rod-shaped member 280 is not fixed to the frame body 277, it slides freely in the XY direction with respect to the frame body 277. However, since the partition plate 278 is fixed integrally with the partition plate 278, the partition plate 278 is fixed in the XY direction. If it moves to, it will move to XY direction in connection with it.

  When the rod-shaped member 280 moves in the Y direction, the end 285 of the rod-shaped member 280 on the warning member 271 side pushes the region 286 on the rod-shaped member 280 side with respect to the rotation shaft 276 on the flat side surface 282 of the warning member 271, so that the warning member 271 Rotate in V direction. On the other hand, when the rod-shaped member 280 moves in the X direction, the warning member 271 rotates in the W direction by the action of the torsion coil spring 287 attached to the warning member 271. The torsion coil spring 287 has a rotating shaft 276 that passes through the coil, and is fixed to a fixing portion 289 erected on one main surface 275 of the pedestal 274 at one end portion 288 side serving as a fixed end, and becomes a free end. The end portion 290 side is fitted in the groove 292 of the region 291 opposite to the region 286 across the rotation shaft 276 on the flat side surface 282 of the warning member 271 and is attached in a state where a load is applied in the direction of winding the coil. It has been.

  As shown in FIG. 5, the heat-deformable member 273 is positioned in the vicinity of the heat sink 220 because the temperature information display unit 270 is attached to the inner side surface 222 of the heat sink 220. Therefore, the heat of the heat sink 220 is easy to propagate, and when the temperature of the heat sink 220 rises, the temperature of the heat deformable member 273 also rises, and when the temperature of the heat sink 220 falls, the temperature of the heat deformable member 273 also falls. The heat-deformable member 273 is reversibly deformed into, for example, a first shape when the casing 201 is lower than the first temperature, and a second shape when the case 201 is higher than the second temperature. .

  More specifically, as shown in FIG. 8A, the heat-deformable member 273 has a contracted first shape when the side peripheral surface 227 of the heat sink 220 is at the first temperature. The partition plate 278 is closer to the X direction side in the frame body 277, the rod-shaped member 280 is also moved to the X direction side, and the warning member 271 is urged in the W direction by the action of the torsion coil spring 287 to be In the position. When the warning member 271 is in the first position, the temperature information display unit 270 is in the first display form. In this state, the non-warning surface 284 is present at the position of the window portion 223 indicated by a two-dot chain line, The non-warning surface 284 can be visually recognized from the outside of the housing 201 (the outer surface 221 side of the heat sink 220) via the portion 223, and the inside of the window portion 223 looks blue, which is the color of the non-warning surface 284. The same applies to the windows 224 to 226.

  On the other hand, as shown in FIG. 8B, the heat-deformable member 273 has an extended second shape when the side peripheral surface 227 of the heat sink 220 is at the second temperature. The rod-shaped member 280 is also moved to the Y-direction side in the body 277, and the warning member 271 is pushed by the end portion 285 of the rod-shaped member 280 and rotated in the V direction to the second position. exist. When the warning member 271 is in the second position, the temperature information display unit 270 is in the second display form. In this state, the warning surface 283 is present at the position of the window portion 223 indicated by a two-dot chain line, and the window portion The warning surface 283 can be visually recognized from the outside of the housing 201 (the outer surface 221 side of the heat sink 220) via the H.223, and the inside of the window portion 223 looks red as the color of the warning surface 283. The same applies to the windows 224 to 226.

5 and 6, since the light emitting module 150 side of the heat sink 220 is not covered with the globe 260, the inside of the housing 201 can be visually recognized from the window 223 even when the globe 260 is opaque. be able to.
In the illumination light source 200 according to the second embodiment as described above, when the user touches the casing 201, the user checks whether the windows 223 to 236 are blue or red. It can be determined that it is safe to touch, and if it is red, it can be determined that the housing 201 should not be touched until it turns blue.

In the second embodiment, the meanings of the first temperature and the second temperature are the same as those in the first embodiment. Then, when the side peripheral surface 227 of the heat sink 220 is at a temperature between the first temperature and the second temperature, the windows 223 to 236 have a blue color that is a color of the non-warning surface 284 and a warning surface 283. You can see the red color. As the temperature of the side peripheral surface 227 of the heat sink 220 approaches a dangerous temperature, the ratio of red (warning surface 283) to the entire window portions 223 to 236 increases.
[Modification]
Although the illumination light source according to the present invention has been specifically described above based on the embodiment, the content of the present invention is not limited to the above-described embodiment. For example, the following modifications can be considered.
<Temperature information display unit>
In the first embodiment, when the casing is at the first temperature, the inside of the window portion is white and changes to red when the second temperature is reached. In the second embodiment, the casing is the first temperature. When the temperature is 1, the inside of the window is blue and changes to red when the second temperature is reached. However, the present invention is not limited to the configuration in which the color changes by combining them, and the color changes in other combinations. It may be configured to do so. Furthermore, not only the color changes, but also a configuration in which a pattern (including characters, symbols, pictures, etc.) changes, or both a color and a pattern change may be used. Note that the changing color or pattern may be an inconspicuous color or pattern when the casing is at the first temperature, or a conspicuous color or pattern when the casing is at the second temperature. .

  Further, in the first embodiment, the window portion changes to a conspicuous color when it reaches a dangerous temperature (second temperature) when touched by the casing, but conversely, it stands out from the window portion when the dangerous temperature is reached. A configuration in which the color disappears may be used. For example, in the first embodiment, the main surface 183 on the warning member 171 side of the pedestal 175 is blue and the warning surface 174 is white, so that the case where the temperature information display unit 170 is in the first display form is a housing. The blue of the main surface 183 can be seen from the outside of the window 101 through the window 123, and when the second display form is reached, the blue portion is covered with the warning member 171 so that it appears white. A configuration may be adopted in which the housing 101 is recognized as having a dangerous temperature when is disappeared.

Further, the present invention is not limited to a configuration for recognizing that the housing is at a dangerous temperature due to a change in color or pattern, but may be a configuration for recognizing that the housing is at a dangerous temperature by a visual change. What is necessary is just like the light source 300 for illumination which concerns on the modification shown in FIG. 9, and the structure which makes it recognize that a housing | casing is dangerous temperature by a shape change, for example may be sufficient.
The light source 300 for bulb-shaped illumination includes a case 310, a heat sink 320, a lighting unit 130, a base (not shown), a light emitting module 150, and a temperature information display unit 370. The heat sink 320 is disposed in the opening so as to close the opening of the case 310, and has a columnar heat sink body 321 having a short height and a disk stacked on the circular surface of the heat sink body 321 on the lighting unit 130 side. A concave portion 323 is provided on the circular surface of the heat sink main body 321 on the lighting unit 130 side. The casing 301 includes a case 310 and a heat sink 320 (the outer surface of the casing 301 includes an outer peripheral surface of the case 310 and an outer surface of the heat sink 320). A window 302 is formed to allow the heat sink 320 to communicate with the recessed portion 323 of the heat sink 320. In addition, since the lighting unit 130 and the light emitting module 150 are the same as those in the first embodiment, description thereof is omitted.

  The temperature information display unit 370 includes a coiled heat-deformable member 371 that is reversibly deformed into a first shape and a second shape, a frame 372 in which the heat-deformable member 371 is stored, A rod-shaped member 373 that reversibly moves in accordance with the deformation of the sex member 371, and a warning member 374 that is fixed to one end of the rod-shaped member 373 and loosely inserted into the window 302 of the housing 301. The configurations of the heat-deformable member 371, the frame 372, and the rod-shaped member 373 are substantially the same as the configurations of the heat-deformable member 273, the frame 277, and the rod-shaped member 280 according to the second embodiment, and have the same functions. To demonstrate.

  In the light source for bulb-shaped illumination 300, when the temperature of the outer peripheral surface of the case 310 is the first temperature, as shown in FIG. 9A, the heat-deformable member 371 made of a bidirectional shape memory alloy is expanded. It is a 1st shape, the warning member 374 is settled in the window part 302 (it does not protrude from the outer surface of the housing | casing 301), and cannot be visually recognized from the outer side of the housing | casing 301. FIG. On the other hand, when the temperature of the outer surface of the case 310 becomes the second temperature, as shown in FIG. 9B, the heat-deformable member 371 is deformed into the contracted second shape, and the rod-shaped member is corresponding to the deformation. 373 moves to the warning member 374 side, and the warning member 374 moves in the same direction as the movement. Therefore, the end 375 of the warning member 374 opposite to the rod-shaped member 373 protrudes from the inside of the window 302 and protrudes from the outer surface of the case 310, and the surface of the end 375 as a warning surface is the housing 301. It will be visible from the outside.

In the case of the above configuration, the user can determine that the housing 301 is at a dangerous temperature if the end portion 375 protrudes from the outer surface of the housing 301. In this case, the surface of the end portion 375 of the warning member 374 may be colored so that the end portion 375 protruding from the outer surface of the case 310 can be easily recognized from the outside of the housing 301.
<Heat deformable member>
The heat-deformable member according to the first and second embodiments was configured to deform into the first and second shapes when the side peripheral surface of the heat sink was at the first and second temperatures, In the present invention, the part to be subjected to the first and second temperatures is not limited to the side peripheral surface of the heat sink, and is a part constituting the outer surface of the housing such as the outer peripheral surface of the case or the outer surface of the heat sink. Also good. Furthermore, instead of the outer surface of the housing, it may be a portion other than the inner surface or the surface of the housing.

Further, the heat-deformable member is not limited to a Ni—Ti-based shape memory alloy, and may be a Cu—Zn—Al-based or Fe—Mn—Si-based shape memory alloy, or the like. Any shape memory resin or bimetal can be used as long as it has a first shape when the housing is at the first temperature and deforms to the second shape when the housing is at the second temperature. A member made of a material other than the shape memory alloy may be used.
<Others>
The light source for the bulb-type illumination does not necessarily have the same external shape as the incandescent bulb, and is an illumination light source intended to replace the incandescent bulb, and has a lighting circuit and a base so that it can be applied to a lamp for the incandescent bulb. Any illumination light source may be used.

The light emitting module is not limited to the LED module, and may be a module including a solid light emitting element other than an LED, such as a semiconductor laser diode or an electroluminescent element. An arc tube having a layer and containing mercury or the like inside may also be used.
The base is not limited to a screw type base such as an E type (so-called Edison type), and may be a pin type base.

  The present invention can be widely used in general lighting.

Sectional drawing which shows the structure of the light source for bulb-shaped illumination which concerns on 1st Embodiment 1 is a cross-sectional perspective view taken along line AA in FIG. Perspective view showing temperature information display unit It is a figure for demonstrating the change of the display form of a temperature information display unit, FIG. 4 (a) is a figure which shows a 1st display form, FIG.4 (b) is a figure which shows a 2nd display form. Sectional drawing which shows the structure of the light source for bulb | ball-shaped illumination which concerns on 2nd Embodiment. BB sectional perspective view in FIG. Perspective view showing temperature information display unit It is a figure for demonstrating the change of the display form of a temperature information display unit, FIG. 8 (a) is a figure which shows a 1st display form, FIG.8 (b) is a figure which shows a 2nd display form. It is a figure for demonstrating the temperature information display unit of the light source for bulb-shaped illumination concerning a modification, Comprising: Fig.9 (a) is a figure which shows a 1st display form, FIG.9 (b) is a 2nd display form. Figure showing

100, 200, 300 Light source for bulb-type illumination 101, 201, 301 Case 110, 310 Case 120, 220, 320 Heat sink 123, 223-226, 302 Window 130 Lighting unit 140 Base 150 Light emitting module 170, 270, 370 Temperature Information display unit 171, 271, 374 Warning member 173, 273, 371 Thermally deformable member 174, 283 Warning surface 284 Non-warning surface

Claims (8)

A light emitting module;
A lighting unit for lighting the light emitting module;
A housing to which the light emitting module and the lighting unit are attached;
A heat-deformable member that is disposed within the housing and has a first shape when the housing is at a first temperature and deforms into a second shape when the second temperature is higher than the first temperature; ,
When the heat-deformable member is in the first shape, the first display form is changed. When the heat-deformable member is changed into the second shape, the second display form is changed in accordance with the deformation. and a temperature information display unit that changes to the second display mode is attached to the housing in a visible state from the outside of the housing from the display form,
The change from the first display form to the second display form of the temperature information display unit is such that the display form changes for a while as the temperature of the housing increases, and the rate of the change is also the above bulb-shaped lighting source, wherein viewable der Rukoto from the outside of the housing. The heat-deformable member is reversibly deformed into a first shape when the casing is at or below a first temperature, and into a second shape when at or above a second temperature,
The said temperature information display unit changes reversibly into the 1st display form and the 2nd display form according to a deformation | transformation of the said heat-deformable member, The light bulb-shaped illumination for Claim 1 characterized by the above-mentioned. light source.   The light source for bulb-type illumination according to claim 2, wherein the heat-deformable member is made of a bidirectional shape memory alloy. The temperature information display unit includes a warning member having a warning surface for warning that it is a dangerous temperature that may cause a burn when touching the housing;
When the temperature information display unit is in the first display form, the warning member is in a first position where the warning surface cannot be visually recognized from the outside of the housing, and the temperature information display unit is in the second display form. In this case, the light source for bulb-type illumination according to any one of claims 1 to 3, wherein the light source moves from the outside of the housing to a second position where the warning surface can be visually recognized.   The warning member further has a non-warning surface with a color and / or pattern different from the warning surface, and when in the first position, the non-warning surface is visually recognized from the outside of the housing. 5. The light bulb according to claim 4, wherein the warning surface cannot be visually recognized and is located at the second position, but the non-warning surface cannot be visually recognized from the outside of the housing, but the warning surface can be visually recognized. Light source for shaped lighting. The casing contains the lighting unit therein, a cap attached to one end side, a cylindrical case having an opening on the other end side, and the lighting unit arranged to close the opening of the case A heat sink on which the light emitting module is mounted on the opposite side;
The heat sink has a window portion penetrating from the light emitting module side to the lighting unit side,
The warning member is disposed on the lighting unit side of the heat sink, and the warning surface is not visible from the light emitting module side of the heat sink through the window at the first position, and the warning surface is not visible at the second position. The light source for bulb-shaped illumination according to claim 4 or 5, wherein the light source can be visually recognized from the light emitting module side of the heat sink through the window portion. The casing contains the lighting unit therein, a cap attached to one end side, and a cylindrical case having an opening on the other end side, and is disposed so as to close the opening of the case and is opposite to the lighting unit A heat sink on which the light emitting module is mounted,
The case has a window on the outer peripheral surface,
In the first position, the warning member is located on the inner side of the case from the outer peripheral surface of the case, and in the second position, the warning member protrudes from the outer peripheral surface of the case with the warning surface protruding from the window portion. The light source for bulb-type illumination according to claim 4, wherein the light source is also located outside the case.   The light source for a bulb-shaped illumination according to claim 6 or 7, wherein the heat-deformable member is disposed on the lighting unit side of the heat sink and in the vicinity of the heat sink.

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