NZ602789B - Lamp - Google Patents
Lamp Download PDFInfo
- Publication number
- NZ602789B NZ602789B NZ602789A NZ60278912A NZ602789B NZ 602789 B NZ602789 B NZ 602789B NZ 602789 A NZ602789 A NZ 602789A NZ 60278912 A NZ60278912 A NZ 60278912A NZ 602789 B NZ602789 B NZ 602789B
- Authority
- NZ
- New Zealand
- Prior art keywords
- heat radiation
- fins
- lamp
- cylindrical portion
- cylindrical
- Prior art date
Links
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Abstract
602789 A LED lamp (1) is disclosed including a board (16) mounted on a flat plate portion with light emitting elements (15) mounted to the board (16). A cylindrical portion (2) extends from the back surface of the flat plate portion and contains an electrical circuit board. A plurality of heat radiation fins (25) are arranged radially around the cylindrical portion (2) and extend along the cylindrical portion (2) so that a gap (S) is formed between the cylindrical portion (2) and the heat radiation fins (25). A joint portion (105) joins the end portions of at least two paired heat radiation fins to form an air flow path between the cylindrical portion (2) and the joint portion (105). diation fins (25) are arranged radially around the cylindrical portion (2) and extend along the cylindrical portion (2) so that a gap (S) is formed between the cylindrical portion (2) and the heat radiation fins (25). A joint portion (105) joins the end portions of at least two paired heat radiation fins to form an air flow path between the cylindrical portion (2) and the joint portion (105).
Description
PATENTS FORM 5 Our Ref: PO46486NZ
Dated: 4 March 2013
PATENTS ACT 1953
COMPLETE SPECIFICATION
Lamp
We, Iwasaki Electric Co., Ltd., incorporated in 116, Nihonbashi—bakurocho, u,
which we pray that a patent may
Tokyo, 103-0002, Japan, hereby declare the invention, for
to be particularly described
be d to us, and the method by which it is to be performed,
in and by the following statement:
0013E(6750930_1)2AZT
,.;.:,_W
1-; Field of the Invent1on
'The present 1nvent10n relates toa base type lamp uS1nq
ll1ghtemlttlng elements suchasLEDs(L1ght Em1tt1 y
organic2EL ro Lum1nescence) or the llkeasa.l1ghtsource”
2.; Descr1pt1on of the Related Art
v3e35
A base type LED lamp thatis avallable as an alternatlvegT’V
of an lc light bulbhas been popular in connect1on w1thf25519‘””
'(forexample,;17"
‘DJp—A201160754)
However, sufficient heat radiation performance can not be obtained by the
conventional heat radiation fins, and particularly the heat generated from the rical
portion cannot be efficiently radiated.
SUMMARY
A need exists to provide a lamp that can obtain high heat radiation performance.
According to a first aspect of the present disclosure, a lamp including a board
board
having light emitting elements mounted n, a flat plate n having the
flat
mounted thereon, and a cylindrical portion that extends from the back surface of the
electrical
plate portion, has a base provided to the terminal thereof and contains an
circuit board therein, comprises: a plurality of heat radiation fins that are ed radially
and configured
around the cylindrical portion on the back surface of the flat plate portion
between the rical
to extend along the cylindrical portion so that a gap is formed
end portions at a
n and each of the heat radiation fins; and a joint portion forjoining
air flow path
cylindrical portion side of at least two paired heat ion fins to form an
between the cylindrical portion and the joint portion.
between adjacent
The lamp may further comprise a distributing fin that is disposed
each of the adjacent pairs of heat
pairs of heat radiation fins to distribute an air stream to
radiation fins.
6975424_1
The lamp may further comprise a short heat radiation fin
Lthat is ed between the respective paired heat radiation
finsjoinedthroughthejointportionandconfiguredtobeshorter
than the heat radiation fins in the extension length from the
back surface of the flat plate portion.
The lamp may further se a plurality of annular heat
radiation fins that are arranged on the back surface of the flat
plate portion to surround the cylindrical portion and configured
in the extension
to be shorter than the short heat radiation fins
length from the back surface of the flat plate portion.
member that
The lamp may comprise a thermally conductive
of the electrical circuit
is provided between a heating part
board and the cylindrical portion to transfer heat of the heating
part to the cylindrical portion.
fins may'be molded
In the lamp, each of the heat radiation
on the back surface of the
flat plate portion integrally withy
the flat plate portion, and configured to be gradually thinner:
outer peripheral side;'
from the rical portion side to the
'In the lamp, a larger number of light emitting ts‘
outer side of the board that that at
may be provided at the they
center Side of the board
In the lamp, the heat radiation fins maybe configured
sothattheextenSionlengththereofalongthecylindricalportion
Side to thef’
is lly reduced from the rical portion
outer peripheral side.
In the lamp, the thickness of the heat radiation fins may,
be gradually reduced from the back surfaCe side “of the flat plate
portion to the base side.
The lamp may further comprise a gthe coverihg theLboardh
of the flat plate portion, wherein the flat plate portion is,L
configured in a tray~like shape having a side wall at the edge
the side wall,
thereof, an edge portion of the globe is fitted to
the fitting n n the edge portion of the globe
the side wall is sealed by a seal member, the seal member is
othhe
provided over the whole ery Of the outer surface
between thesideu
edge portion of the globe so as to be pressed
cf theglobe,
wall of the flat plate portion and the edge portion
thesealmember, anda guide and
a projection is provided below
hold groove for introducing the projection of the globe from L
side and guiding the projeCtion in a peripherAi“
an upper ehd
L ion to held the globe
the whole, -,L
In the lamp, a fit~ in grOOVe may be proszdedLovLer 7,
ery of the outer surface of the edge portion of the globe,é
fit-in groove so that;7
and the seal membeeray be fitted ih the
surface of theSidei
the sealxnember is pressedloetween the inner
wall of the flat plate portion an Lthefitin groove to seal€h9h
L thefittingportionbetweentheSidewalloftheflatp z:_vfl if";
rand the edgeportion of the globe
The lamp mayfurther comprise a reflection face for VW‘i~
is prOVided oh'
reflecting light cf the light emitting elements
the inner e of.the edge portion of the globe.
In the lamp, the cylindrical n may be configured
base side,
to be r fronlthe flat plate n side to the
a cylindrical member for linking the cylindrical portion to
the outer
socket to which the base is screwed may be mounted on
peripheral surface of the cylindrical portion, and a fitting
member when
structure portion to be fitted to the cylindrical
the cylindrical member is mounted may be provided to the outer
peripheral surface of the cylindrical portion.
In the lamp, the rical member may be a waterproof
packing that covers an area extending from the socket having
to prevent
the base mounted thereon to the cylindrical portion
water invasion between the base and the socket.
be provided
In the lamp, the fitting structure portion may
an upper
with a convex portion or a concave portion to which
is fitted over the whole
edge portion of the waterproof packing
periphery of the cylindrical portion.
In the lamp, over
a convex portion may be provided
wholeperipheryoftheinnerperipheralsurfaceofthecylindrical
member.
between
In the lamp, a connection member may be d
atleasttwoheatradiationfins,andau1anti~dropsupportmember
the connection member.
may be connected to
In the lamp, the heat radiation fins bridged by the
in parallel to
tion member may be provided substantially
each other, a hole pertion may be fermed in each of the
substantially parallel heat radiation fins so as to penetrate
through the heat ion fin, the connection member may be
configuredinarod—likeshape,andtherodélikeconnectionmember
the hole portions of the substantially
may be supported h
parallel heat radiation fins.
In the lamp, the connection member may be joined toa band
wound around the outer peripheral surface of a lamp holder for
supporting the lamp.
In the lamp, the lamp may be rotated to be screwed to
lamp holder, and the band mathave an adjusting pertion
and be allowed to be
adjusting censtriction force othhe band
of the holder:
rotatable on the outer peripheral surface lamp
by loosening the constriction force of the band.
be provided between
In the lamp, the connection member may
as to be nearer to their
- the flat plate portion and the base so
of the ightof w
base than the centereofgrayitproSition
L L
LLLL
the lamp.
In the lamp, the connection'member may beLprotided"toLbet
nearerfixathebasethantheheatradiationfinsofthecmdindrical L'.
r .-
~ 1 _,1
.V_~ .
Lportion
The lamp may further comprise a lead wireunitthav
to the base tosupply5;,L
connected through the cylindrical n
poWerto the plurality of light emitting elements, a. bagportion 1'
formed at the and an ng
tip othhe rical portion,
"1r.
portion that is formed on the outer periphery of the tip so as
to be d with the base, wherein the bag n of the tip
is projected to the outside of the fitting n, and the
ted bag portion is provided a through—hole unit through
which the lead wire unit penetrates.
In the lamp, the through-hole unit may have a pair of
through—holes, the lead wire unit has a pair of through holes,
the pair of lead wires
a pair of introducing portions for guiding
inner surface
to the pair of througheholes may be formed on the
be ted
of the bag portion, and the introducing portions may
fromeachotherbyapartitionwallforbisectingtheinnersurface.
In the lamp, the pair of introducing portions may
configured as conical concaves that are tapered to the
through—holes.
In the lamp, a groove portion in which one of the lead
the outside is
wires drawn through one of the hholes to
fittedmaybeformedontheouterperipheralsurfaceofthefitting:
portion, to that
and the bag portion may configured to project
outside of the groove portion.
heat
According to the lamp of the first aspect, the plural
flat plate:
radiation fins are provided to the back surface of the
portionon which the board having the light emitting elementsy’y
mounted thereon is mounted so that the heat radiation fins ares»
to extend
arranged radially around the cylindrical portion so as
from the back surface of the flat plate n alOng the
cylindricalportionandfernuagapbetweenthecylindricalportion
and each heat radiation fin, and the jOint portion For joiningl
end portions at the Cylindrical portion side of at leaSt two
heat radiation fins is provided to form the air flow path between
thecylindricalportionandthejointportion"Acdordinglyftfie-
outer peripheral Surface of the cylindrical portiOn can be.
airecooled by air passing through the air flow path, and the
electricalCircuitboardaccommodatedinthecylindricalportion
D F
can be cooled.
BRIEF DESCRIPTION OF THE DRAWINGS
deVice haVing anE
- Fig;1 is a diagram g anLED lamp
LED lamp accordingto anembodiment oF the tinvention,t
Figs. 2A to 2C are plan View, side View and bottom~Viewp
LWhich show an exterior ance construction of the LED lamp;
Fig3 is an exploded perspective ViewoF the LEDlamp5l.
Side,F
, when istaken from theupper
Fig 4 is a croSS~sectional View taken along a line IVIV
of Fig; 2C;‘
'Fig;y5 "‘
is a bottom View Showing the LED lamprr m Which
an'annuiar4watengaar~pa¢gingfigyartééhgd;x
I I
I I
Of Fig 5;
Fig. 7 isa Cros’s—sectional Viewtakenalong aline;VIIVII
of‘FigtISXQ
Fig. 8 is a partially-enlarged plan View of a fin having
atrapezoidalshapehavinganopenlowerbase unraV-shapehaving
a flat bottom);
Fig. 9 is a plan view of a housing when the housing is
viewed from a base plate side;
Fig. 10 is a crOSS*sectional View taken along a line X—X
of Fig. 9;
Fig. 11 is an enlarged View showing the al an
insulating cylinder portion;
an anti—drop ure of
Fig. 12 is a diagram g
the LED lamp; and
wherein
Figs. 13A and 13B are diagrams showing a band,
view showing
Fig. 13A is a plan View and Fig. 13B is a perspective
state that an anti—drop wire is secured;
Fig. 14 is onship
a diagram showing the onal
between the gravity center position of the deadweight the
LED lamp and a support hele, wherein the upper stage Fig.
shows
14 shows a setup state and the lower stage of Fig. 14 a
dropout state;
Fig. 15 is a diagram showing the positional relationship
the deadweight of an LED
between the gravity center positidn of
and a support hole, wherein
lamp having a reference Construction
the upper stage of Fig. 15 shows a setup state and the lower,
stage of Fig. 15 shoWs a dropout state;
Fig. 16 is a base plate;
a cross~sectional View showing
—lO-
Fig.17isanenlargedviewoftheengagementportionbetween
a globe and the base plate;
Fig. 18 is a diagram showing a nce uction of
a structure that the globe is threadably seCured to the base
plate; and
Fig. 19 is an enlarged View of a mount portion of the LED
lamp to an exposed socket.
DETAILED DESCRIPTION OF THE EMBODIMENT
An ment according to the present invention will be
described with reference to the drawings.
Inthefollowingembodiment, anLEDlamphav1ngLEDs(light
ng diedes) as light sourcesis.representatively<descr1bedf
as a lamp having a light emitting element as a light sourceli
but the present invention is not limited to this embodiment.
For example», the present invention may be d to alamp having
'another type light emitting element such as an organic EL éfif
L L *“ 1
othe like as a light Source.
95 hav1ngi
Fig. ‘1 is’a diagram ShowinganLED lamp device
an LED lamp 1 according to an embodiment of the presentinvention.
The LED lamp device 95 shown inFig 1 is an outdoor mount .
'type lighting deV1ce used foroutdoor billboard lighting etc"iTi
and it hasan LED lamp 1,a lamph lder60 inWthht
toW“
1-is mounted, an'dfan annular waterproofpacking red
V I”
the LED lamp 1
60 is a holder in which an ex1st1ng light:
i The lamp holder
-11....
bulb can be mounted, and the LED lamp 1 is configured to have
ntially the same shape and optical characteristic as the
ng light bulb, so that the LED lamp 1 can be mounted and
used in the lamp holder 60 in place of the existing light bulb.
Specifically, the lamp holder 60 has a 'cylindrical
holder housing 62, and an arm fixing unit 64 to which a support
arm (not shown) is secured to be freely turnable is provided
to the terminal n 62A of the holder housing
have
The tip 60E of the holder housing 62 is configured to
an opening whose diameter is set so that the tip 60 is fitted
bulb through
to the surface of'a glass bulb of an existing light
awaterproofpackingwithnospacetherebetweenwhentheexisting
light bulb is mounted in the holder housing 62. Accordingly,
invasion
when the light bulb is mounted in the holder housing 62,
into the holder
of water from the edge portion 66 of the opening
housing 62 is prevented. In Fig. l, a projection 68 provided
62 is
to the tip 608 of the holder housing a member for fixing
the LED
a guard member (not shown) which covers and protects
lamp 1 or an existing light bulb.
A socket 65 to which the base (metal cap) 3 of the existing
light bulb or the LED lamp 1 is d is provided in the holder
housing62. ZX powersupplywirewhichisledinfromtheexternal
is connected to the socket 65, power is supplied through the
socket 65 from the base 3 to the LED lanm>l or the existing light
bulb lamp 1.
.. 12..
The annular Waterproof packing 70 is formed of a rubber
1' moldedIneMber, and freely detaChablylnoUnted on the cylindrical
When
(barrel) portion 2 (described later) of the LED lamp 1.
1 is d on the lamp holder 60, the annular
the LED lamp
waterproof packing 70 blocks the opening of the lamp holder
and prevents invasion of water from the gap between the laMp
holder 60 and the LED lamp 1.
Itisunnecessarytoprovidetheannularwaterproofpacking
70 in a case where waterproof is ssary,
for example, in
such a case that the LED lamp 1 is mounted and used in the lamp
the outside
holder 60 installed indoors or a socket exposed to
because the annular waterproof packing
70 is o prevent.
invasion of Water into the lamp holder 60. HoweVer, invasion
60 can be prevented
of dust or the like into the lamp holder
70 when the LED lamp
by mounting the annular waterproof packing
1 is used indoors
‘ Next, the construction OftheLED lamp1 will bedescribed
Figs. 2wa>2Carediagramsshow1ngtheexteriorappearanceI
COnstruCtionv of the LED lamp l,'wherein Fig. 2A is .View,.
Fig 28 is a side View and Fig. 20 is a bottom View.g Fig. 3 isa
1 stakeniif
an exploded perspective View of theLED lamp
I“ SS
an upper Side, and Fig4is a “sectiona,
,\ from
f gures,a tate that
along a line IVIVof Fig2C In these
th e annuIar waterproof packing 70 is mounted on the LEDlampfi
l is shown.
i 13 _
The LED lamp 1 of this embodiment has a light emitting
portion 12, a cylindrical (barrel) portion 2 which extends
downwards so as to be vertical to the substantially center of
aloase
the back surface of the light emitting portion 12 and has
3 at the terminal side thereof, and plural heat radiation fins
provided to the back surface of the light ng portion
12, and the annular waterproof packing 70 bed above is
fitted in the rical portion 2.
The light emitting portion 12 emits light upwards from
and it has
the substantially whole upper surface 12A thereof,
plural LEDs (light emitting diodes) 15 as light sources, an LED
board 16 which is configured to be substantially circular
plan view and on which the LEDs 15 are mounted, a globe 22 and
abaseplatel3aseaflatplateportionwhichisintegrallyprovided
to the tip 2C of the cylindrical portion
to have
The base plate 13 is a member which is configured
shape in top View and be larger in diameter than
a disc-like
the cylindrical portion 2. The cylindrical n 2 extends
downwardssubstantiallyverticallyfromthesubstantiallycenter
13. As shown
portion of the back surface 13A of the base plate
intercommunicates with
in Fig. 3, an ion opening 14 which
the rical portion 2 is formed in the front surface of the
base plate 13, and an electrical circuit board 8 having a powerv
source (power conversion device) for turning 0n LEDs 15 and a
drivingcircuitnmuntedthereonisinsertedthroughtheinsertion
—14—.
opening and mounted in the cylindrical portion 2.
The base plate 13 and the cylindrical portion 2 are
integrally molded from the same material, that is,
thermally-conductive resin.by resinInolding using a1netal.mold.
The housing 35 of the LED lamp 1 is constructed by the base plate
13, the rical portion 2 and an insulating er portion
described later.
PluralLEDs15areannularlyarrangedsoastoformacircular
ringvdflxfliissubstantiallyconcentricixathecylindricalportion
2, and have outer—peripheral side light emitting portions
arrangedannularlyefl:theouterperipheralsidecflfthebaseplate
158 which
l3 and innereperipheral side light emitting portions
arearrangedannularlyefl:theinnerperipheralsideixbbelocated
side light emitting
on the inner side of the outer~peripheral
portions 15A. In this case, as an example, with respect to the
outerperipheral side light emitting portions 15A, thirty
are arranged to be spaCed frOm one another at equal;
elements
intervals, and with respect to the inner~peripheral side light
emittingportionslSB,fifteenelementsarearrangedtobeSpaced
from one another at equal intervals. When estimated per unit
area, the_ tion rate of the LED elements; of theC:
‘Outer—peripheralSidelightemittingportionslBAiSJergerthan1»s
that of the peripheral side light emitting portions 15B.;.h
That is, a larger number of LEDs 15 are mounted at the outer
portionoftheLEDbOard15(correspondingtOtheouterpsripheral
sidelightemittingportions15A)thanthatefizthecenterportion
of the LED board 15 (corresponding to the inner peripheral side
light emitting portions 15B), and the amount of heat generation
of the outerwperipheral side light ng portions 15A per
unit area is larger than that of the inner—peripheral side light
emitting portions 15B.
Forexample,LEDs15areformedbypackagingtheLEDelements.
In this embodiment, white~color LED is used as LED 15. It is
colors than
needless to say that LEDs of other light emission
white color may be used as LEDs 15.
As shown in Fig. 3, the LED board 16 is configured.to have
so that plural LEstlS are mounted
a substantially disc shape
and fixed
on the front surface as the upper surface thereof,
Ito the upper surface of the base plate 13 by plural screws 18.
is formed at the
A lead wire draw—out opening 17
16. A pair of lead
substantially center portion of the LED board
(Fig. 4) for power supply is drawn out from wires 21A and 21B
theelectricalcircuitboardESmountediJ1thecylindricalportion
2 through the lead-wire drawfout opening 17, and electrically
connected to a circuit pattern (not shown) formed on the upper
is
e of the LED board 16, whereby each LED supplied
with power h the circuit pattern and turned on.
As shown in Figs. 3 and 4, the base plate 13 is configured
in a tray—like shape so as to have a flat disc and a side wall
19 along the peripheral edge of the
flat disc, and the globe
22 covering the LED board 16 is fitted to the inner eral
surface of the side wall 19 and held by the base plate
13. An
22 and
0 ring 26 as a seal member is provided between the globe
the base plate 13, the O ring 26 is d between the globe
22 and the side wall 19 of the base plate 13 in connection with
the fitting between the globe 22 and the side wall 19 of the
baseplatel3andsealed,therebywaterproofingthelightemission
portion 12. The fixing structure of the globe 22 and the base
later.
plate 13 will be described in more detail
Asnotshowninthefigures,themodelnumber(brandnumber)
the globe
of the LED lamp 1 is provided to the inner surface of
22bypminting,stmmporthelike. Accordingly,themodelnumber
(brand number) is prevented from vanishing even when the LED
lamp 1 is exposed to weather, and also prevented fronlvanishing
due to friction.
The heat radiation fins 25 are radially provided around
from the back surface 13A
the cylindrical portion 2 when viewed
of the base plate 13. Each heat radiation fin 25 is provided
back surface 13A along the cylindrical
so as to extend from the
portMMIZ,andradiatesheatemittedfrmntheLEDboardl6nmunted
Each heat radiation fin 25 is formed
on the base plate 13.
integrallyvfiifiithecylindricalportionZixlaninjectionfiblding
process for the housing 35.
2 is integrally
The terminal 2A of the cylindrical n
providedwithaabarreltypeinsulatingcylinderportion10formed
-17....
ofaninsulatingmaterialtoinsulatethebase3andthecylindrical
portion2fromeachother,andthebase3isnwuntedontheterminal
shown
10A of the insulating cylinder portion 10 like a crown as
in Fig. 4. The electrical circuit board 8 is mounted from the
tipsideofthecylindricalportionZcmertheinsulatingcylinder
portion 10, and electrically connected to the base 3 through
theleadwiresZlAanleBattheterminalportionoftheinsulating
cylinder n 10 side.
The base 3 has a threaded cylindrical shell 5 which is
screwed into a socket 65 (for example, E39 or E26 (E39 in this
embodiment)typesocket)ofanexisting(established)lampholder
of the end portion
60, and an eyelet 7 provided to the apex portion
of the shell 5 through the insulating n 6, and the shell
and the eyelet 7 are configured in such a dimension that they
lnounted in.an existing socket. Accordingly, the LED lamp
1 can be mounted in an ng socket
on the ceiling or wall
surface or in the socket 65 of the lamp holder 60 in which an
existing light bulb is mounted and used, whereby the LED lamp
1 be used as an alternative for an existing light bulb.
Asdescribedabove,theshellESandthecylindricalportion
each other by the insulating
2 are electrically insulated from
er portion 10. Therefore, even when the cylindrical
portionZZisformedofaamaterialhavingelectriCalconductivity,
theinsulationbetweentheshellSofthebase3andthecylindrical
portion 2 can be kept excellent.
~18—y
When axnetal material such as aluminuntor the like is used
for the rical portion 2, it has high heat radiation
performance. However,thehousing35containingthecylindrical
portion 2 is heavy in weight, and thus there is a problem that
the strength is insufficient when an existing socket is used.
Therefore, according to this embodiment,
thermally~conductive resin is used as the material of the
cylindrical n 2, insulating resin is used as the material
oftheinsulatingcylinderportionlO,andtheinsulatingcylinder
portion 10 is molded integrally with the cylindrical n
2 by insert molding.
By forming the cylindrical portion 2 of
thermally—conductive resin, the weight of the LED lamp 1 can
bereducedmoregreatlyascomparedwiththecasewherethehousing
is formed of a metal material such as aluminum or the like.
Therefore, even when the LED lamp Lis mounted as an alternative
for an existing light bulb in an existing socket or an existing
lampholder60,neitheraworknoranemberisrequiredtoreinforce
the existing socket or the existing lamp holder 60 in order to
support the weight of the LED lamp 1, and they can be directly
usedxvithout dification;, Furthermore, the numberiof heat
ion fins 25 can be increased because the weight is d, .
so that the surface area increases and the heat radiationi
performancecankxaefficientlyenhanced. ‘Aresinmaterialhaving
high thermal conductivity which has a coefficient cf thermal
«19w
conductivity of 2W/mK or Inore is preferably used as the
thermally—conductive resin, and polycarbonate resinrnixedxwith
carbon fiber having high thermal conductivity (Raheama
(registered trademark) produced by Teijin Limited in this
embodiment) is preferably used.
The insulating cylinder portion 10 is formed ally
resin
with the cylindrical portion 2kn/the insertlnolding using
is firmly
material, whereby the insulating cylinder portion
joined to the cylindrical portion 2. However, there is a risk
that
a crevice occurs in the joint face (mating face) of
ginsulating cylinder portion 10 due to secular change and the
waterproof mance is lost.
Therefore, as shown in Fig. 4, a fitting concavo—convex
nZBisformedontheinnerperipheralsurfaceoftheterminal
2AofthecylindricalportionZ,andalsoafittingconcavo~mxwex
n 10B which is engagedly fitted to the fitting
concavo~convex n 2B is formed on the outer peripheral
surface in the neighborhood of the end of the g of the
insulatingcylinderportion10,therebyconstructimgaso—called
labyrinth—like fitting structure. Furthermore, the‘area<1fthe
strengtilis enhanced.
joint portion increases and thus the joint
Furthermore,
a flange lOC with which the terminal 2A of
cylindrical portion 2 comes into contact is formed below
insulating cylinder
fitting concave-convex portion 108 of the
into_
n 10, thereby preventing water invasion the
i 20 .
labyrinth—like fitting structure portion. Accordingly, even
when a(gap<3ccurs on the Inolding face at the joint portion
between the cylindrical portion 2 and the insulating cylinder
portion 10 due to a crack or the like caused by secular change,
thewaterproofperformancecanbenaintainedbyhelabyrinth-like
g structure portion and the flange 10C, and durability
which is commensurate with the lifetime of the LED 15 can be
obtained.
The shape of the joint face between the terminal 2A of
the cylindrical portion 2 and the opening end tion end)
of the insulating cylinder portion 10 is not limited to the
labyrinth—like shape, and any shape such as a wedge—like shape
as the waterproof performance
or the like may be adopted insofar
and the joint strength can be enhanced. Furthermore, the joint
between the cylindrical portion 2 and the insulating cylinder
portion 10 may be established by assembly using screwing or
like insofar as requirements for various kinds of performance
are satisfied.
t board
Next, the mount structure of the electrical
in the cylindrical portion 2 will be described.
AsshownixlFig.4,'theelectricalcircuitboard8Aisformed
so as to extend from the tip 20 of the cylindrical n 2
to the insulating cylinder portion 10, and configured to have
al shapes of the cylindrical
a shape which is fitted to the
n 2 and the insulating cylinder 10.
-21..
the diameter R of the upper portion of the
That is,
cylindrical portion 2 (Fig. 4) is set to be ntially equal
the electrical circuit
to the lateral width of the upper portion of
when the electrical circuit board 8 is
board 8. Therefore,
inserted in the cylindrical portion 2, the electrical circuit
116 (Fig. 9) formed on
board 8 is pinched by pinching portions
, whereby
the inner portion of the insulating cylinder n
in the cylindrical portion
the electrical t board 8 is fixed
2 is miniaturized
At this time, when the cylindrical portion
the upper portion thereof is reduced
so that the diameter R of
of the electrical
to the same level as the width of the upper portion
8 approaches to
circuit board 8, the electrical t board
the cylindrical portion 2, and thus the electrical insulation
2 and the electrical
performance between the cylindrical n
circuit board 8 is degraded. Therefore, an insulating sheet 28
2 so as to
is provided to be wound in the cylindrical portion
surround the electrical circuit board 8, and the whole inner
is d by the insulating
surface of the cylindrical portion 2
between the
sheet 28 to enhance the insulation performance
electrical circuit board 8 and the rical portion 2.
The insulating sheet 28 is formed of one belt—like sheet
and the ike
having flexibility and insulation properties,
in this embodiment)
sheet is rolled once or at plural times (twice
to make the belt-like sheet be cylindrical .
When the insulating
sheet28isinsertedintothecylindricalportionZ,theinsulating
sheet 28 unrolls and expands in the cylindrical portion 2. At
me,theinsulatingsheet28:hsmountedontheinnersurface
of the cylindrical portion 2 by the unrolling force so as to
cover the inner surface.
As bed above, the insulating sheet 28 is formed in
ion opening 14 of
a belt—like shape, inserted into the
the base plate 13 while rolled, and mounted in the cylindrical
portion2bytheunrollingoftheinsulatingsheet28. Therefore,
in the cylindrical
the ting sheet 28 can.be easilylnounted
portion2:Maastocmverthewholeinnersurfaceofthecylindrical
portion 2.
at the lower
Furthermore, a cut~out portion 28B is formed
(see Fig. 3) of the insulating sheet 28, and
edge portion 28A
positioned to a projecting portion 14A (see Fig. 9) provided
in the cylindrical portion 2, whereby both the end portions of
the insulating sheet 28 which other
are overlapped with each
when the insulating sheet 28 is rolled can be positioned.
Therefore,thecylindricalportingcanbefurtherminiaturized.
end portions
That is, when the overlapped ns of both the
into the cylindrical
of the insulating sheet 28 are inserted
portion2,underthestatethatitisunknownwheretheseoverlapped
portionsarelocated,itwouldbenecessarytoprovideacflearance
circuit board 8 and
between the edge portion of the electrical
thecylindricalportionZ:Uiconsiderationofthesheetthickness
-23..
corresponding to three rolls of the insulating sheet 28 (under
twice g) at the overlap position of both the end ns
of the insulating sheet 28. That is, in this case, the rolling
frequency of the insulating sheet 28 is equal to twice, but the
sheet thickness corresponding to three rolls of the insulating
sheet 28 must be considered.
However,whentheoverlapportionsofboththeendportions
oftheinsulatingsheet28arepositionedbytheprojectingportion
14A so as to avoid the positions between the edge n of
the electrical circuit board 8 and the cylindrical portion 2,
electrical
a clear may be provided between the edge portion of the
circuit board 8 and the cylindrical portion 2 in consideration
of the sheet ess corresponding to the rolling frequency
oftheinsultingsheet28. Thatis,inthiscase,whentherolling
sheet
frequency of the insulating sheet 28 is equal to twice, the
thickness corresponding to two rolls of the insulating sheet
28 may be considered. Accordingly, the clearance can be more
greatly reduced, and the cylindrical portion 2 can be further
miniaturized.
TheelectricalcircuitboardEBinsertedixlthecylindrical
portion 2 is fixed in the cylindrical portion 2 while the lower
end side thereof is pinched by the pinching portions 116 (Fig.
9) as described above. At this time, the upper end portion 80
of the electrical t boardi3is d downwardly through
a fixing bush 27 by the LED board 16 secured to the base plate
-24i
Specifically, whicklis provided
a heat generating part 8X
turn on LEDS 15 is mounted on the
to a power supply circuit to
electrical circuit board 8 as shown in Fig. 4, and for example
ametalheatsink29tmvinghighthermalconductivityispmovided
tctheheatgeneratingpart8x. InFigs.3and4,referencenumeral
for thinning. The surface
29B represents a recess portion 29B
the heat sink 29 is coated
the heat generating part 8X
of or
n filler to bring
with grease type thermallyeconductive
and the heat sink 29 into close
both the heat ting part 8X
contact with each other, whereby the heat generated from the
is transferred to the heat sink 29.
heat generating part 8X
The fixing bush 27 is provided between the heat sink 29
and the cylindrical portion 2, and contact tions 27A are
end of the fixing bush 27.
integrally ed to the upper
contactprojections27Acomeintocontactwiththebottomsurface
circuit
so that the electrical
of the LEDlooard l6‘tokxepressed,
boardESispressedthroughtheheatsink29andtheheatgenerating
part 8X.
The fixing bush 27 is an elastic member having relatively
and the fixing bush 27 is pressed
high thermal conductivity,
the heat sink 29 to thereby
against the cylindrical porticw12 by
member 29D by the heat sink
construct a thermal tive
from the heat
and the fixing bush 27. The heat generated
generating part 8X is transferred to the cylindrical portion
- 25 _
2 through the thermal conductive member 29d, and radiated to
the outside from the outer peripheral surface of the cylindrical
portion 2.
According to this embodiment, as shown in Figs. 3 and 4,
the heat sink 29 is configured to extend to the neighborhood
of the cylindrical portion 2, the fixing bush 27 formed in a
capwlike shape is d on the tip portion 29A of the heat
sink29,auxithefixingbush27 ispressedagainstthecylindrical
portion 2.
Accordingtothisconstruction,thethicknessofthefixing
bush 27 interposed between the heat sink 29 and the cylindrical
portion 2 is reduced, so that heat is easily erred from
the heat sink 29 to the rical portion 2.
Whenthefixingbush27isconfiguredtobethin,theelastic
force of the fixing bush 27 is reduced by the amount corresponding
to the reduction of the ess thereof, and sag occurs
8 the elastic circuit board 8 when the elastic circuit board
sink 29 when the
is pressed by the fixing bush 27 and the heat
elastic circuit board 8ijsfixed. Therefore, it is desired that
thefixingbush27:haconfiguredtohavesuchcushionperformance
that the sag can be suppressed.
Furthermore, when the amount of heat ed from the
surfaceoftheheatsink29totheatmospherearoundthecylindrical
portion 2 is large, the heat stays in the cylindrical portion
2, and thus affects the other circuit parts. Therefore, with
i26_
respect to the heat sink 29, a heat—radiation fin shape
(concavo~convex shape) is formed at only the tip n 29A
d by the fixing bush 27, and the cap—like shape of the
fixing bush 27 is formed so as to intrude into and come into
of the heat—radiation
contact with the concavo‘convex portion
fin shape, whereby heat is more easily transferred from the
heat~radiation fin shape of the tip portion 29A to the fixing
bush 27 than that from the peripheral surface.
sink 29 to
Accordingly, the heat radiation from the heat
2 can be suppressed, and
the ambient of the cylindrical portion
the generated heat can be efficiently transferred to
cylindrical n 2.
As described above, the inner surface of the cylindrical
sheet 28, and axnaterial
portion 2 is covered by the ting
havinghighthermalconductivityisusedfortheinsulatingsheet
from the fixing bush 27 to the
28, so that the heat transfer
sheet
cylindrical portion 2 is not disturbed by the insulating
ribedabove,theinsulatingsheet28hashighthermal
conductivity, and the fixing bush 27 as a thermallywconductive
thermally connecting the circuit parts of the
member for
sheet 28 is provided
electrical circuit board 8 and the insulating
of the electrical circuit board
between each of the circuit parts
8 and the insulating sheet 28, whereby both the tion
electrical circuit board 8 can be
the heat radiation for the
-27..
enhanced.
Furthermore, the above construction may be modified so
that the insulation sheet 28 is provided with a cut~out portion
by cutting out the insulation sheet 28 in a range which comes
into contact with the fixing bush 27, whereby the fixing bush
27 is brought into direct contact with the cylindrical portion
2 through the cut—out portion. In this case, heat is directly
transferred from the fixing bush 27 to the cylindrical portion
2 through no insulating sheet 28.
3,referencenumera1270representsasubstantially
ke insulating bush sing a rubber part formed of a
silicon al, and it is mounted on the upper end portion
BC of the electrical circuit board 8 and pressed against the
LED board 16 facing from the insertion opening 14. The voltage
enduranceperformancecanbeenhancedbyprovidingtheinsulating
bush 270 between the electrical circuit board 8 and the LED board
Fig. 5 is a bottom View of the LED lamp 1 under the state
that the annular waterproof packing 70 is detached frontthe LED
lamp 1, Fig. 6 is a cross—sectional view taken along a line VI~VI,
and Fig. 7 is a cross—sectional View taken along a line VII—VII.
As described above, the g 35 containing the
cylindricalportionjzandthebaseplate1K3isintegrallyprovided
with the plural heat radiation fins 25, y enhancing the
heat radiation performance.
“28-
Theheatradiationfins25areconfiguredlikethinplates,
andmanyheatradiationfins25areerectedsubstantiallyradially
around the axial line of the cylindrical portion 2 whew Viewed
ebacksurfacelBAcflfthebaseplate13. Finrootportions
fins 25 are joined
25E$as the root portions of the heat radiation
tothebacksurface13Aofthebaseplatel3,andtheheatradiation
fins 25, the cylindrical portion 2 and the base plate 13 are
resin described
integrally molded from the l conductive
mold. As described above,
above by resin molding using axnetal
fins 25 are integrally
the base plate 13 and the heat radiation
base plate 13
molded, whereby the heat ance between the
and each heat radiation fin 25 heat
can be suppressed and the
can be increased
transfer amount to the heat ion fins
to achieve high heat radiation performance.
rds fronlthe back
The heat radiation fins 25 extend
surface 13A of the base plate 13 along the cylindrical portion
radiation fin 25
2, but a gap 8 is provided between each heat
fins
and the cylindrical portion 2 so that the heat radiation
through.the gaps
are separated fronlthe cylindrical porticw12
fins 25 are paired,
S. Respective two adjacent heat radiation
2 side of
and both the end portions at the rical portion
are connected to each other
each pair of heat radiation fins
each fin 101 having
througtxa joint portion 105, thereby forming
lower base
a substantially trapezoidal shape whose is.opened
flat bottom) (hereinafter
(or a substantially V—shape having a
~«.29..
referred to as "open trapezoidal fin") in bottom View. Here,
the upper base of the trapezoidal shape and the flat bottom of
the V~shape correspond to the joint portion 105. These open
trapezoidal fins 101 are formed integrally with one another.
According to the open trapezoidal fins 101, an air flowing
path F is formed between the cylindrical portion 2 and each joint
portion 105 as shown in Fig. 5. Therefore, the outer peripheral
surface of the cylindrical portion 2 is air—cooled and the
electrical circuit board 8 mounted in the rical portion
2 is cooled.
ularly, the heat of the heat generating part 8X of
theelectricalcircuitboard8 istransferred1x>thecylindrical
through the fixing bush 27 and the heat sink 29
portion 2 as
described above. Therefore, the electrical circuit board 8 is
efficiently cooled e the cylindrical portion 2 is cooled
by air passing h the air flow paths F.
In this embodiment, the adjacent two heat radiation fins
oinedtoeachotherthroughthejointportionlOS. r,
three
enclportions at the cylindrical porticw12 side of adjacent
ormoreheatradiationfins25maybejoinedtooneanotherthrough
a joint portion 105.
As shown in Fig. 5, a distributing fin 103 is provided
trapezoidal fins 101 (each fin
between the adjacent open
corresponds to the pair of the heat radiation fins 25 joined,
so that
at both the ends thereof through the joint portion 105)
-30..
air g through the gap between these adjacent open
trapezoidal fins 101 to the cylindrical.portion.2ixsdistributed
101 concerned.
to each of the adjacent open trapezoidal fins
The distributing fins 103 extend from the back e 13A of
2 like the heat
the base plate 13 along the cylindrical portion
radiationfinsZS,anxiagapisprovidedbetweeneachdistributing
103 and the cylindrical portion 2 by fin a ting portion
91. The air stream passing through the gap between the open
trapezoidalfins101isdistributedtoeachoftheopentrapezoidal
fins101bythedistributingfin103,wherebyunevennessofcooling
the 2
on the outer eral surface of cylindrical portion
2 can be uniformly
can be suppressed, and the cylindrical portion
cooled.
AsshownixiFig.1,thedistributingfins103areconfigured
length from the base plate 13 along the
to have a shorter
cylindrical portion 2 (for example, a shorter vertical length
in the vertical direction in Fig. 1) than the heat ion
fins 25. Accordingly, air can flow over the distributing
oidal fins 101, so that the air
103 between the open
distribution of the distributing fins 103 can be uniformly
performed.
radiation fins 25 of the
The respective confronting heat
101 are arranged in parallel to
adjacent open trapezoidal fins
formed the
each other, and the distributing fin 103 is at
portion between the paired confronting heat
intermediate
i 31 1
ionfins25zuiparalleltotheseconfrontingheatradiation
fins 25.
As shown in Fig. 5, the back surface 13A of the base plate
13 is further provided with short heat radiation fins 102 each
located.between the respective heat radiation fins 25 which are
each
joined to each other by the joint portion 105 to constitute
oidal heat radiation fin 101. The short heat radiation
fins 102 are configured to have a shorter length from the back
surface 13A of the base plate 13 along the cylindrical portion
2(forexample,ashorterverticallengthintheverticaldirection
of Fig. 1) than the heat radiation fins 25, and also have
length the distribution fins 103. The heat radiation
same as
of the base plate 13 is assisted by each short radiation fin
mounted.
102, and LEDs 15 having higher output power can be
the short heat radiation fins 102 are formed to
Furthermore,
fins 25, and the end.portions
be shorter than the heat ion
1020 at the cylindrical portion 2 side of the short radiation
105 h gaps
fins 102 are separated from the joint portions
101 is not
Sa. ore, air flow in the open trapezoidal fins
disturbed, and; thus the cooling performance of the open
trapezoidal fins 101 which mainly carry out heat radiation
not disturbed.
In addition, as shown in Fig. 5, outside annular fins 106
and inside annular fins 107 are formed on the back surface 13A
of the base plate 13 fins which are
as annular heat radiation
i 32 ,
arranged so as to surrOund the cylindrical portion 2. These
outsideannularfinslO6andinsideannularfins107areconfigured
surface 13A of the base
to have a shorter length from the back
plate 13 along the cylindrical portion 2 than the short heat
inside
radiation fins 102. The outside annular fins 106 and the
air streanw in the open
annular fins 107 brings randonlnature to
fins 101,
trapezoidal fins 101 and between the open trapezoidal
thereby enhancing the g performance.
In addition, since the outside annular fins 106 and the
inside annular fins 107 are short, when the LED lamp 1 is used
12 are located
in a e that the light emitting ns
at lower positions than the base 3 (under so-called downward
trapped;
lighting), water or the like is prevented from being
annular fin 106, the inside
in a space surroundeclby the outside
fin 101.
annular fin 107 and the open oidal
The e annular fins 106 are formed just below
15A, the inside
outer-peripheral side light emitting portions
the inner—peripheral side
annular fins 107 are formed.just.below
and the outside and inside annular
light emitting portions 158,
outer peripheral side of
fins 106 and 107 are located at
can be
the joint portions 105. The heat generated from LEDs
the base plate 13 can be reinforced
efficiently radiated and
annular
annular fins 106 and'the inside
by arranging the outside
fins 107 just below LEDs 15.
fins 25,
In this embodiment, not only the heat radiation
but also the short heat ion fins 102, the buting
fins 103, the outside annular fins 106 and the inside annular
fins 107 which are shorter than the heat radiation fins
are
provided on the back surface 13A of the base plate 13 as described
above. At this time, the heat radiation performance could be
enhanced by lengthening the tive fins. If so, it causes
increase of the weight of the housing 35. Therefore, in this
embodiment,onlytheheatradiationfins250ftheopentrapezoidal
fins 101 which are
are in charge of most of heat radiation
lengthened, and the other fins are shortened, whereby ight
of the housing 35 is suppressed. However, as the fin length
back surface
increases, the moment applied to the fin roots on the
13A increases. ore, the heat radiation fins 25 are
configuredtobethickerthantheotherfinstoenhancethestrength
thereof.
Here, the surface of the housing 35 containing the base
is coated with coating
plate 13, the heat radiation fins 25, etc.
material or chemicals to enhance weather resistance or design
Conventional LED
performance after the resin molding thereof.
heat radiation fins
lamps are generally configured so that the
and also the
radially extend from the cylindrical portien 2,
at the base plate 13 side of the heat radiation ifgl
end portions
the base plate.7l
fins 25 are connected to the back surface 13A of
13. Therefore, there is~a problem that in thé above coatingr
into
process, the g material or the like hardly intrudes
_ 34 i
the corner portions of each joint portion between the baseIQlate
l3 and each of the cylindrical portion 2 and the heat radiation
fins 25, and also the coating material or the like droops in
front of the fins when the amount of the coating material or
the like is increased. ore, it is required in the coating
process to coat the coating material or the like little by little
ividingthecoatingprocessintopluralsteps. Therefore,
the coating frequency increases, which causes increase of the
cost.
On the other hand, in the LED lamp 1 of this embodiment,
the separating portion 91 for separating the heat radiation fin
and the cylindrical portion 2 from each other is provided
over the area from the fin root portion 25B as the root portion
(at the upper position in the vertical direction) of each heat
radiation fin 25 (as a joint portion to the base plate 13) to
the fin'tipJZSA (at the lower position in the vertical direction)
of the heat ion fin 25 to provide the gap S between each
heat radiation fin 25 and the cylindrical portion 2.
Accordingly,inthecwatingprocessofcmatingthehousing
, no pool of liquid occurs between each heat radiation fin
25andthecylindricalportionZ. Therefore,theamountofliquid
to be coated per once can be increased to reduce the coating
frequency, and the coating material can be easily and mly
coated on the g 35. Particularly, the coating material
goes around the rical portion 2 through the separating
“35’...
portions 91 by ng the g material through a spray
or the like, so that the coating material can be coated evenly
in a broad range by only one coating operation..
Furthermore, the weight of the g 35 can be reduced
by providing the separating portions 91, and the cost of the
material can be suppressed. Furthermore, rain water or the like
heat radiation fin
carxbe prevented from collecting between the
and the cylindrical portion 2 when the LED lamp
1 is used.
radiation fins
In addition, with respect to the short heat
102 provided in the open trapezoidal fins 101, the gap Se is
102 and the joint
providedloetween each short heat radiation fin
Accordingly, uneven (irregular) coating of the
portion 105.
the open trapezoidal
coating material can be also prevented from
fins 101.
As shown in Fig. l, the fins 101
open trapezoidal (the
heat radiation fins 25), the short heat ion fins 102 and
the distributing fins 103 are configured to be substantially
fan—shapedinsideviewsoastodrawanmderatearcinthedirection
from the back surface 13A of the base plate (Fig. 2) to the
edge n 66 of the opening of the holder housing 62,
fins 101 (the heat radiation
lengths of the open trapezoidal
102 and the<distributing 7
fins 25), the short heat radiation fins
of the cylindrical 31'
fins 103 which extend in the axial direction
pOrtion 2 (that is, the lengths thereof along the cylindricalu
inner peripheral side:
portion 2) are gradually reduced fronithe
(the cylindrical portion 2 side) to the outer peripheral side.
Asdescribedabove,theheatradiationfinsZS,etc.areconfigured
to be substantially fan~shaped in side View, whereby sense of
be enhanced
unity n the lamp holder 60 and the LED lamp 1 can
when the LED lamp 1 is mounted in the lamp holder 60, thereby
enhancing the design performance.
As shown in Fig. 6, the fin tips 101A of the open trapezoidal
fins 101 are formed horizontally (vertically to the axial line
ofthecylindricalportionZ),andtheuppersurfaceoftheannular
2 comes
waterproof packing 70 mounted on the cylindrical portion
into contact with the fin tips 101A.
As shown in Fig. 7, the base plate 13 is configured
be gradually thinner from the inner peripheral portion
connected to the cylindrical portion 2 to the outer peripheral
portion 130. Specifically, the fixing e 13D of the base
is fixed is formed to be vertical
plate 13 to which the LED board 16
the axial line of the cylindrical portion 2, and the back
radiation
surface 13A of the base plate 13 on which the heat
surface so that the
fins 25 are formed is configured as a taper
whole e thereof as
thickness thereof is smaller over the
side. The
the position thereof shifts to the outer peripheral
base plate 13 has lower heat ance to the heat radiation
the outer peripheral
fins 25 as the position thereof shifts to
portionl3Csidewhichissmallerinplatethickness. Furthermore,
theinnerperipheralportion13BofthebaseplatelBisconfigured
-37....
‘tx>bethicker,andthushashighrigidity. Therefore,thefixing
surface 13D can be prevented from warping and the flatness
the fixing surface 130 can be enhanced.
Fig. 8 is a partially enlarged plan view of the open
trapezoidal fin 101.
As shown in Fig. 8, the heat ion fin 25 constituting
the open trapezoidal fin 101 has a large ess portion 110
at which the plate ess of the fin root portion 258 is
substantially equal to the plate thickness of the joint portion
105,andasmallthicknessportion111atwhichtheplatethickness
of the fin root portion 25B is gradually smaller from the end
n of the large thickness portion 110 to the tip side of
the outer eral side of the heat radiation fin 25. The
boundaryportionllOA<Fig.8)betweenthelargethicknessportion
is located between the
110 and the small thickness portion 111
annular fin 106 and the inside annular fin 107.
outside
As described above, the fin root portions 258 of the heat
fin 101 are
radiation fin 25 constituting the open trapezoidal
outer
configured to be thinner in plate thickness toward the
fin 101 is lighter
peripheral side, so that the open trapezoidal
in weight toward the outer peripheral side; _
In this, ment, as, described";y’aboi‘xir'é; the open, .
trapezoidal: fins~ 101 Larer configuredfl t2} bef Substantially
fan-shaped in side View so as to draw a modérate aid, andithéflfilxvf
extension length of thé‘open trapezoidal fin 101 extending in
-38..
the axial direction of the rical portion 2 is gradually
reduced from the inner peripheral side to the outer peripheral
side. Therefore,whenexternalforceactsontheopentrapezoidal
fin lOl, bending moment applied to the fin root portion 25B of
the open trapezoidal fin 101 is smaller as the applied position
shifts to the outer peripheral side at which the length in the
axial direction of the open trapezoidal fin 101 is r.
Therefore, the plate thickness of the fin root portion 258 of
the heat radiation fin 25 constituting the open trapezoidal
is d to be smaller toward the outer peripheral side 101
in conformity with the bending .
Furthermore, in order to prevent occurrence of sink
(shrinkage)onthefixingsurface13Dintheresinmoldingprocess,
it may be considered that the thickness of the base plate 13
is larger than the plate thickness of the open trapezoidal
lOlatthefinrootportionZSB. Inthiscase,theheatresistance
from the base plate 13 to the open trapezoidal fin 101 increases.
However, in this embodiment, the base plate 13 is configured
13C side in
to be r toward the outer peripheral portion
conformity with the plat thickness of the fin root portion
the outer
of the heat radiation fin 25 which is smaller toward
peripheralside. Therefore,sinkcanbepreventedfromoccurring
on the fixing surface 13D in the resin molding process with
ing the heat radiation performance of the base plate
surface 13D, the
By preventing occurrence of sink of the fixing
-39..
ss of the fixing surface 13D is enhanced, and the
adhesiveness between the fixing surface 13D and the LED board
of the
16 is enhanced, so that the heat ion performance
base plate 13 can be enhanced. More specifically, when sink
25B of each open trapezoidal fin
occurs in the fin root portion
surface 13D and the LED
101, a gap occurs between the fixing
board 16 at this n. However, by preventing occurrence of
16 can be brought
sink, the fixing surface 13D and the LEDlaoard
into close contact with each other, so that the heat radiation
performance can be enhanced.
Furthermore, the base plate 13 and the open trapezoidal
fins101arecmnfiguredixabethinnertowardtheouterperipheral
and thus the weight of the housing can be reduced.
side,
Still furthermore, the base plate 13 and the open
toward the
trapezoidal fins 101 thinner
are configured to be
outer peripheral side, and the heat radiation mance at
Therefore,
the outer peripheral side is enhanced.
heat of the
outer—peripheral side light emitting portions 15A whose heat
generation amount is larger than that of the peripheral
side light emitting portions 158 can be efficiently radiated.
the open trapezoidal fins
Even when the base plate 13 and
die cast, sink can be suppressed
101 are manufactured by aluminum
by adopting the construction of this embodiment.
As shown in Figs. 6 to 8, the esses of the heat'
fins 101,
radiation fins 25 constituting the open trapezoidal
the short heat ion fins 25, the distributing fins 103,
the outside annular fins 106 and the inside annular fins 107
from the
are set to be gradually smaller in the axial direction
fin root portions 25B to the end of the base 3 side. ore,
the thickness of each fin acts as a releasing taper, and when
the housing 35 is molded by a metal mold, the housing 35 can
be easily separated fronlthe metal mold in the axial direction.
Furthermore, groove portions 115 are formed at both the
sides of the fin root portion 258 of each of the heat radiation
fins 25 constituting the open trapezoidal fins 101, the short
heat radiation fins 102, the distributing fins 103, the outside
annular fins 106 and the inside annular fins 107. The groove
portions 115 are formed over the whole length of each fin.
shrinkage range of the resin in the neighborhood of the fin root
ns 25B can be ed due to this groove portion 115,
13D can be suppressed
so that sink occurring on the fixing surface
13 can
and at the same time the surface area of the base plate
be increased.
As shown in Figs. 1 to 4, the annular waterproof packing
in side
70 is formed in a substantially truncated conical shape
view (a substantially trapezoidal shape in section) so as to
be continuous with arcs corresponding to the outer shapes of
the heat radiation fins 25, the contour shape ucted by
the heat radiation fins 25 and the annular waterproof packing
70 is set to be substantially equal to the contour shape of an
_ 41 _
existing glass bulb. Accordingly, even when the LED lamp 1 is
used in place of the existing light bulb, a trouble caused by
the difference in shape can be prevented.
fiber having high
Here, a resin material mixed with carbon
thermal conductivity (hereinafter referred to as “thermal
conductive fiber”) is used as the material of the cylindrical
portion 2. It is known that anisotropy occurs in thermal
conductivity in ance with orientation of the l
conductive fiber.
In this embodiment, the thermal conductive fiber is
oriented so as to increase the l conductivity from the
heat radiation
cylindrical portion 2 and the base plate 13 to the
radiation performance of
fins 25, y enhancing the heat
the cylindrical portion 2. The orientation of the thermal
of the resin injecting
conductive fiber is controlled on the basis
direction in a resin injection molding process.
Next,
21B at
a structure of passing lead wires 21A and
portion 10 will
the al 10A of the insulating rical
be described.
which is taken
Fig. 9 is of housing 35
a plan view the
from the base plate 13 side.
116 for
As shown in Fig. 9, a pair of pinching portions f_
pinching and supporting the edge portions of the electrical
circuit board 8 are provided on the inner peripheral surfade
oftheinsulatingcylinderportionll)soasixaprojecttherefrom.
-42..
The pinching portions 116 are arranged to be ly displaced
fromthecenteroftheinsulatingcylinderportionlOandconfront
each other, and the electrical circuit board 8 is supported to
be ly displaced from the center of the insulating cylinder
portion 10 so that the plate surface thereof is in parallel to
the axial line of the insulating er portion 10.
Fig. 10 is a cross—sectional view taken along a line XeX
of Fig. 9.
AsshowninFigs.4,9and10,theinsultingcylinderportion
is closed by a bag portion 120 formed at the terminal 10A.
Specifically, the bag portion 120 has a plate portion 121
provided of the
so as to close the terminal 10A at the inside
end face of the terminal 10A, and a pair of projecting portions
122A and 122B obtained by projecting a part of the plate portion
121 to the eyelet side 7. The projecting portions 122A_and 122B
a cylinder portion 123 formed at the end of
are surrounded by
the al 10A, and an inside portion of the cylinder portion
not formed
123 at which the projecting n 122A and 122B are
serves as a recess portion 124 which is inwardly concaved from
the end face 123A of the cylinder portion 123.
closer
The projecting portion 122A and 122B project to be
totheeyelet”?sidethantheendface123Acflfthecylinderportion
123, and they are formed to be d to the tips thereof.
end of the eyelet side 7 of the housing 35 corresponds to the
tips of the projecting portions 122A and 122B.
-43..
Wire holes 125A and 125B as through~holes penetrating
formed at the
through the projecting portions 122A and 122B are
and 122B, and the
tip portions of the projecting portions 122A
electrical circuit
lead wires 21A and 21B extending from the
and extend
board 8 pass through the wire holes 125A and 125B
to the base 3 side. The wire holes 125A and 125B are arranged
parallel
on the center line of the insulating cylinder portion
View. Large~diameter
to the electrical circuit board 8ij1plan
wire holes 125A and
portions 129 are formed at the ends of the
1258, and the lead wires 21A and 218 are easily bent at
largewdiameter portions 129.
The projecting portions 122A and 122B are formed at the
side of the bag n 120
inner surface so that the center
portion of the plate portion 121 remains, whereby a partition
wall 126 ting to the light emitting portion 12 side
formed by the plate portion 121 .
The inner space of the terminal
10A which is substantially cylindrical in section
substantiallybisectaflbythepartitionwall126. Thepartition
the center of the
wall 126 is disposed so as to pass through
insulatingcylinderportion10andbesubstantiallyperpendicular
to the plate surface of the ical Circuit board
As shown in Fig. 9p the led
lead wires 21A and 21B are
outfronpOSitionscorrespondingtoboththeSidesofthepartitionI
circuit board 8
wall 126 at the lower side of the electrical
127A and 127B fer g
A pair of introducing portiOns
-44....
the lead wires 21A and 21B to the wire holes 125A and 1258 are
formed at the inside of the projecting portions 122A and 122B.
The introducing portions 127A and 127B are formed in a conical
shape<funnel~shape) d to the wire holes 125A and 125B at
127B
the tip thereof, so that the introducing portions 127A and
can surely guide the lead wires 21A and 21B to the wire holes
125a and 125B. Furthermore, the inner space of the terminal 10A
issubstantiallybisectedbythepartitionwall126,andoccupied
by the ucing portions 127A and 1278. ore, the lead
wires 21A and 21B necessarily abut against the introducing
portions 127A and 127B, can
so that the lead wires 21A and 21B
be surely guided to the wire holes 125A and 1258.
In the ling process, the electrical circuit board
to the
8 is inserted through the insulating er portion.10
7 side along the pinching portions 116. In connection
eyelet
board
with the insertion of the electrical circuit 8, the lead
circuit
wires 21A and 21B at the lower portion of the electrical
board 8 come into contact with the introducing portions 127A
wall 126 and
and 127B which are partitioned by the partition
located below the lead wires 21A and 218, and surely led to the
wire holes 125A and 1258 while guided by the funnel~shaped
introducing portions 127A and 127B.
As shown in Fig. 4, the lead wire 21A drawn out from the
wire hole 125A is passed through the inside of the base
3 and
connected to the eyelet 7. The lead wire 2lB drawn out fronlthe
-45...
wire hole 1258 is bent to the outside at the terminal 10A of
the ting er 10, extends along the outer e of
to the
the insulating cylinder portion 10 and then is connected
shell 5.
As described above, the wire holes 125A and 1258 through
drawn out are
which the lead wires 21A and 218 are respectively
provided in front of the position at which the lead wire 218
is outwardly bent. Therefore, the lead wires 21A and 218 can
be prevented from intertangling with each other and thus
short—circuited to each other. Furthermore, by providing the
introducing portions 127A and 1278, the lead wires 21A and 218
and 1258.
can be simply passed through the wire holes 125A
1258 are formed
Therefore, 125A and
even when the wire holes
is substantially equal to that of
so that the diameter thereof
occurs therebetween,
the lead wires 21A and 218 and thus no gap
these lead wires 21A and 218 can simply passed h the
wire holes 125A and 1258.
terminal 10A of the
Fig. 11 is an enlarged view of the
ting cylinder portion 10.
A screw portion 33 (locking portion) which is engaged with
the inner peripheral Surface of the shell 5 to lock the base
of the terminal 10A
3 is formed on the-outer peripheral surfaCe
’. A wire grboVe‘ 34 ,
of the insulating Cylinder portiOn (grd‘ovél
portiOn) extending in the axial direction 0f the insulating”
cylinder portion 10 is formed on the outer peripheral surface
_ 46 _
of the terminal 10A, and the wire groove 34 is provided to be
engraved in a part of the screw portion 33. The lead wire 21B
whichbendsandextendsoutwardsfromtheinsideoftheinsulating
cylinderll)extendstx>thecylinderporthmuZsidewhileembedded
in the wire groove 34. That is, under the state that the shell
insulating cylinder 10, the lead wire 21
is secured to the
34 at the inside of the shell
passes through the wire groove
to the outer peripheral surface cf the shell 5
, and joined
of the shell 5. The end
in the neighborhood of the opening end
34 is d at the end face 123A of
34A of the wire groove
the cylinder portion 123, and the projecting portions 122A
1228 projects to the eyelet 7 side at the outside of the end
34A of the wire groove 34.
34 through which the lead
Furthermore, the wire groove
wire 218 passes links to the inside of the insulating cylinder
intercommunicate
, and the eyelet 7 and the cylinder portion 2
wire holes 125A and 125B in the
with each other h the
ting cylinder 10. Therefore, air can get into/out of the
34 and the wire holes
cylinder n.2 through the wire groove
125Aand125B,therebypreventingdewcondensationinthecylinder
portion 2.
When the base 3 is secured to the insulating cylinder 10,
insulating cylinder 10 and fixed to the insulating cylinder
is engaged with the screw portion
under the state that the shell 5
..47_
33 of the ting cylinder 10.
A pair of prepared holes 56 for swage of the base 3 are
provided in the side surface of the insulating er 10. The
shell 5 of the base 3 is swaged at the positions corresponding
to the prepared holes 56, y the shell 5 is deformed so
the ation
as to intrude into the prepared holes 56, whereby
amount of the shell 5 increases, and the th of the swaging
portions can be enhanced.
When the LED lamp 1 is installed in a downward ng
stateunderwhichtheLEDlamp1.lightsdownwards,thebagportion
120 constitutes the upper surface of the housing 35. In this
embodiment, the bag portion 120 projects to the upper
side of
under
the end face 123A of the insulating cylinder portion
125A and 125B the downward lighting state, and the wire holes
of the end face 123A. Therefore,
are located at the upper side
even when water invades into the upper surface portion of
the like, these
housing 35 due to dew condensation, rain water or
from the wire holes 125A
water can be prevented from invading
and 125B into the housing 35. Furthermore, when the invasion
amountofwaterislarge,thewaterispooledintherecessportion
124 of the upper surface portion. However, the wire holes 125A
that water
and 1258 are located above the end face 123A, so can‘
Wire holes 125A and 1258...
be prevented from invading into the
located at It
Furthermore, the wire holes 125A and 1258 are
higherpOSitionsthantflmeend34Acfifthewiregroove34 Therefore,e V
w48....
even when water invades along the wire groove 34 into the upper
surface portion of the g 35, the water can be prevented
frontinvading into the wire holes 125A and 125B. Therefore, air
can get into/out of the cylindrical portion 2 through the wire
groove 34, whereby water can be ted from the wire holes
125Aand125Bintothehousing35withpreventingdewcondensation
in the housing 35.
Next, there will be described an anti~drop structure for
the LED lamp 1 suitably used when the LED lamp 1 is installed
in a so~called downward lighting state under which the LED lamp
1 is set up at a high place and lights an illumination target
object such as an advertizing display or a wall e which
is disposed at the vertical lower side, an indoor or the like.
Fig. 12 is for
a diagram showing the anti—drop structure
the LED lamp 1.
As shown in Figs. 1 to 3, Fig. 5 and Fig. 12, the LED lamp
1 has a pair of metal pins 130 joined to the adjacent open
trapezoidal fins 101 (two pairs of adjacent open trapezoidal
fins 101 in this embodiment), and a pair of rop wires 131
joined to the pins 130. Each of the anti—drop wires 131 is
connected to a metal band 133 fixed to the lamp holder 60, whereby
theLEDlampl.isjoinedtothelampholder60throughtheanti~drop
wire 131 need as the
. Any rod—like or string—like member may be
anti~drop wire 131 insofar as it ons as a support member
for supporting the LED lamp 1.
~ 49 -'
As shown in Fig. 5, each pin 130 is bridged between the
pair of adjacent open trapezoidal fins 101 between which the
distributing fh1103 issandwiched. Specifically,each;fl11130
is bridged between the heat radiation fins 25 arranged
substantially in parallel so as to penetrate through the heat
ion fins 25 substantially dicularly to the surface
of the fin 25. As described above, the pins 130 are joined to
plural heat radiation fins 25, y the pins 130 are firmly
fixed.
Each of the heat radiation fins 25 through which the pins
130 penetrate is provided with a suppOrt hole 134 at the
ediate portion of a portion thereof which extends in the
radial direction of the base plate 13, and.both the end.portions
ofeachpin130areinsertedthroughthesupportholes134,whereby
the pins 130 is fixed to the heat radiation fins 25. Each pin
130 is fixed to the intermediate portion in the height direction'
ofeachheatradiatLMIfM125,andlocatedbelowthecflstributing'
fin 103.
Each pin 130 has a flange portion 130A.at one end thereof,
and the pin 130 is inserted through the support hole 134 of one ‘
eatradiationfins25tobetmidge bythepin13Oconc1rniwvl
while the portion130A thereo
radiation fin 25 concerned, and the other ” :5‘5i’
concerned is inserted through the support hole 134of theother55fvinlg
heat radiation fin 25and fitted in a fiXing ring130B Sothat -
_ 50 _
the pin 130 is fixed to the heat radiation fin 25 by the fixing
ring 130B.
Inthisembodiment,theheatradiationfins251x>bebridged
by the pins 130 are arranged substantially in parallel to each
other. Therefore, the support holes 134 can be easily formed
in the heat radiation fins 25 by a machine work or the like
forming through~holes penetrating through the heat radiation
fins 25 after the resin g process. The t holes 134
metal mold
may be formed by a boring ism provided to the
used for the resinxnolding of the housing 35. In this case, the
supportholes134<xu1beeasilyformedbecausetheheatradiation
fins 25 are arranged substantially in parallel.
rmore, the pair of pins 130 are provided so as to
confront each other through the cylindrical portion 2.
The antivdrop wire 131 is constructed by crooking both
the crooked
the ends of a wire in a ring~like shape and swaging
and has a pin joint
ends of the wire with swaging portions 131D,
portion 131A to be hooked to the pin 130 at one end thereof,
and a band joint portion 131B to be joined to the band
133 at
the other end thereof. The ring—shaped portion of the pin joint
130.
portion 131A has a hook 131C to be hooked to the pin
Figs. 13A and 13B show the band 133, wherein Fig. 13A is
and Fig. 13B is a ctive View
a plan View of the band 133,
showing the state that the anti—drop wire 131 is secured.
As shown in Fig. 13, the band 133 has aCZtype ring portion
”51..
135obtainmdbybendimgaband—likeplateannularly(likearing),
of the C type
an adjusting portion 136 ed to an open end
ring portion 135, and a pair of wire joint portions 137 formed
on the outer peripheral surface of the C type ring portion 135
so as to project outwards from the outer peripheral surface.
The adjusting portion 136 has a nut portion 136A formed
at one end of the C type ring portion 135, a hole portion 136B
C type ring n 135, and a formed at the other end of the
bolt 136C screwed to the nut portion 136A. The er of the
C type ring portion 135 of the band 133 can be changed by fastening
136B to the nut
the bolt 136C inserted through the hole portion
portion 136A, whereby the constriction force of the band
to the lamp holder 60 can be adjusted.
131B of the
A hole 137A to which the band joint n
the wire joint portion
antiedrop wire 131 is joined is formed in
around the wire joint
137, and the anti—drop wire 131 is le
portion 137. as to
The wire joint portions 137 are provided so
confronteachotherinconnectionwiththepins130. Enrthermore,
the wire joint portions 137 are arranged so that the antiedrop
wires 131 to the axial line of the
are substantially parallel
LEDlamp1.underthestatethattheantivdropWires131areJOined t
to the pins 130.
L Theband133iswoundandfixedaroundabandwmndingportimnI
6mjprov1dedcn1theouterperipheralsurface311theneighborhood
ofthetipGOBofthelampholder60 Astepportion6ODprOjecting
_ 52 _
outwards is formed at the tip 60B side of the band winding portion
60C. When the band 133 moves to slip out of the lamp holder 60,
the band 133 abuts against the step portion 60D, whereby the
band 133 is prevented from slipping out in the axial direction
of the lamp holder 60.
When the LED lamp 1 is secured to the lamp holder 60, the
hook 131C of each anti—drop wire 131 is joined to each pin 130
of the LED lamp 1 to connect the band 133 to the LED lamp 1.
Subsequently, the band 133 is kept under an expanded state, the
LED lamp 1 is inserted into the lamp holder 60 from the base
3 side while the lamp holder 60 is passed through the band 133,
and the band 133 is arily fixed to the band g portion
60C of the lamp holder 60. Under this state, the constriction
force of the band 133 is loosened by the adjusting portion 136,
and the diameter thereof is set so that the band 133 is rotatable
on the outer peripheral surface of the lamp holder 60, but it
does not detach from the lamp holder 60.
Subsequently, the base 3 of the LED lamp 1 is screwed to
the socket 65 by rotating the LED lamp 1. At this time, the band
133 rotates together with the LED lamp 1. As described above,
the LED lamp 1 is screwed to the lamp holder 60 under the state
that the LED lamp 1 is ted to the lamp holder 60- through
the anti-drop wires 131 and the band 133. Therefore, when the~
LED lamp 1 is secured to the lamp holder 60, the LED lamp 1 can'
be suppressed from ng off the lamp holder 60 .
Furthermore,
153..
when the LED lamp 1 is detached from the lamp holder 60, the
LED lamp 1 can be prevented from dropping by rotating the LED
lamp 1 while the band 133 is loosened.
After the LED lamp 1 is screwed to the socket 65, the band
133 is completely constricted by the adjusting portion 136,
whereby the band 133 is fixed to a predetermined position of
the band winding portion 60C of the lamp holder 60 . Accordingly,
the LED lamp 1 is fixed to the lamp holder 60 through the pair
of antiwdrop wires 131, thereby preventing the LED lamp 1 from
dropping off. That is, even when the engagement between the base
3 and the socket 65 is ed from any cause, the LED lamp
1 can be ted from dropping off because it is fixed to the
lamp holder 60 by the antiedrop wires 131.
Tension is applied to the anti—drop wires 131 by adjusting
the on at which the band 133 is fixed, whereby the r
waterproofpacking'fl)iscompressedbetweentjuaopentrapezoidala
fin 101 and the tip 60B of the lamp holder 60], Therefore, eVen‘
when Vibration acts, occurrence of a gap between the annular
waterproof packing 70 and the lamp holder 60 can be prevented,’
and the waterproof performance can be enhanced. ‘
Furthermore,the weight of theLED1'31
'the antidrop Wires 131 andthe socket
vacting on the socket 6r>¥5 reducedgj’
can be prevented_frombeing deformed or dama.. lfhlfind
or the like act’s;
-54...
Furthermore, the LED lamp 1 is supported by the anti-drop
wires 131 which confront each other h the cylindrical
portion 2. Therefore, even when the engagement between the base
3 and the socket 65 is released, the LED lamp 1 can be ted
from dropping out of the lamp holder 60. For example, when the
is supported
above construction is modified so that the LED lamp 1
the LED lamp
by only one antivdrop wire 131, the dropping of
1 can be prevented, but the rop wire 131 and the LED lamp
1 may turn around the pin 130, so that the LED lamp 1 drops out
of the lamp holder 60.
that
This ment has been described.on the assumption
wires 131 are provided. However, this
a pair of anti~drop
wire 131
embodiment may be modified so that only one anti—drop
in consideration of the weight of the LED lamp 1
is provided
to be imposed and the LED lamp
or an estimated load or the like
1 is supported by only one antivdrop wire 131.
Furthermore, in this embodiment, the pin 130 bridged
between two heat radiation fins 25 is provided as a connection
this
member. r, the present invention is not limited to
embodiment. Theconnectionmembermaybeconfiguredtobebridged
between two or more heat ion fins 25. For example, the
connectionmembermaybearing~shapedmemberwhichmakesacircuit
the support,
of the cylindrical portion 2 while paSSing thrcugh
holes 134 formed in all (twelve)heat radiation fins 25, and the
connection member.
anti—drop wire 131 may be connected to this
_ 55 _
In place of the rod—like pin 130, a string—like wire may be used
as the connection member.
rmore, the present invention is not limited to the
construction that the anti—drop wire 131 is secured to the lamp
holder 60 by using the band 133. For example, one end side of
around the lamp holder
a string—like anti—drop>wire 131 is wound
60 or the like to fix the one end side of the string—like antiwdrop
wire 131 to the lamp holder 60, and the other end f is
fixedtothepin130orthelikeoftheLEDlampl,therebypreventing
drop of the LED lamp 1.
Here, since the LED lamp 1 is heavier than a normal
incandescent light bulb or the like, the load imposed on the
socket 65 and the base 3 increases. Therefore, when the LED lamp
1 is used while d on a lamp holder 60 having an existing
socket 65 which is designed for an incandescent light bulb,
example, vibration is applied to the LED lamp 1 from vehicles,
etc. running on a road. When the effect of the vibratiOn
the socket
accumulatively applied to the socket 65 and the base 3,
65, the base 3, etc. are damaged, so that the LED lamp 1 may
drop out of the lamp holder 60 with high probability.
two antidropfelfl
In this embodiment, as describedabove, the
wires 131 extendlng from the lamp holder 60are connectedtqih5~'6
ore,event}.
the pins 130 of the LED lamp 1 at tWO pOS1tions ,
when the LED lamp i~
1 drops out of the socket 65, the drop of the
LED lamp 1 can be prevented,
...56_
However, as described above, the dead weight of the LED
lamp1.islargerthantheincandescentlightbulb,etc. Therefore,
in a case where the LED lamp 1 dropped out of the socket 65 greatly
swings when ded by the anti-drop wire 131, the LED lamp
alsillboard
1 may collide against an nation target such.as
so that the LED lamp
or the like and thus suffer a great impact,
1 is damaged by the impact.
according to this embodiment, in order to
Therefore,
suppress the swing width of the LED lamp 1 when LED lamp
ldropsout<1fthesocket65,thesupporthole3134forsupporting
3 than the
the pins 130 are ed to be nearer to the base
the LED lamp
center—ofwgravity position Gx of the dead weight of
emitting portion 12 and the bags 3.
1 between the light
relationship
Fig. 14 is a diagram showing the positional
between the center—of—gravity position Gx of the dead weight
of the LED lamp 1 and the support hole 134, wherein the upper
stage of Fig. 14 shows 1 is installed
a state that the LED lamp
and the lower stage of Fig. 14 shows a state that the LED lamp
1 drops out.
The center—of~gravity position Gx of the dead weight
correspondstothepositioncorrespondingtothecenterofgravity
of the eight of the LED lamp 1 .1 When there is any-”accessory
70 or the like“Which is
such as the annular waterproof packing
1 when the LED lamp 1 dropS"V
kept to be mounted 0n the LED lamp
out of the socket 65, the total weight centaining the weight
157..
of the accessory concerned is adopted as the dead weight of the
LED lamp 1.
When the LED lamp 1 is used under the downward lighting
state, as shown at the upper stage of Fig. 14, the LED lamp 1
is set up so that the base 3 is d in the socket 65 in such
a posture that the light emitting portion 12 of the LED lamp
1 faces a vertical lower side and the base 3 is located at a
vertically higher position than the light emitting portion 12.
When the base 3 drops out of the socket 65 under this setup
state as shown at the lower stage of Fig. 14, the support hole
134 is turned as a supporting point so that the —of—gravity
position Gx of the dead weight is located vertically just below
thesupporthole134ixnwhichtheantiedropwire131iscmnneCted.
In the LED lamp 1 of this embodiment, the support hole
134 is ed to be nearer to the base 3 than the
center—of~gravity position Gx of the dead weight, and the:
center—of—gravityposition(hcofthedeadweighthasbeenalreadv
134 Under
located at a vertically lower side of the support hole
the setup state. ore, the turn (swing) amount of the LED_
lamp 1 under the dropout state corresponds to the level of
displacement amount in the horizontal direction nthefr‘.'
center——Ofgravity pOSition Gx of the dead weightandthesupporti‘jlf’
ho is 134,_-so_ that the swing Width of the LEDlamp 1 caused by,_f}}f_r
the turning Can be suppressed to arelaWSS‘flhSh
Fig. 15 iS a diagramShOWlng thepositional relatio ShlpSL‘hih
”—58—
between the center—of—gravity on Gx of the dead weight
of the LED lamp 1, wherein the upper stage of Fig. 15 shows the
setup state of the LED lamp and the lower stage of Fig. 158 shows
the dropout state of the LED lamp. In the case of the LED lamp
1 in which the support hole 134 is disposed to be nearer to the
light emitting portion 12 than the centervof-gravity position
Gx of the dead weight of the LED lamp 1 as shown at the upper
socket stage of Fig. 15, when the base 3 drops out of the 65,
the LED lamp 1 greatly turns (swings) around the support hole
134 as a supporting point so that the center—of—gravity position
side of the
Gx of the dead weight located at a vertically upper
side of the
support hole 134 moves to the vertically just lower
supporthole134,andtheswingwidthoftheLEDlamplisrelatively
in connection with the turn (swing) of the LED
large lamp 1.
That is, as in the case of this ment,
the support
hole 134 is provided to be nearer to the base 3 than
center—of~gravity position Gx of the dead weight, Whereby the
turn (swing) amount of the LED lamp 1 when the base 3 drops out
of the socket 65 can be reduced. Therefore, the swing width of
the LED lamp 1 can be suppressed to a relatively small value.
As a result, even when the LED 1amp 1 is loosened and
temporarily drops out of thesocket 6E the p
1 can be
avoided frOm impinging t anilluminati aktar etsuch
Widthof the LED lamp.
a billboard or the like because the sw1ng 5116)
1 under the drop-out state is small Furthermore, even.when'the3'
-59..
LED lamp 1 impinges against the illumination target, the impact
at that time can be suppressed, and thus the LED lamp 1 can be
prevented from being damaged.
ribedabove,theimpactappliedixathesupporthole
134 is suppressed. Therefore, the housing 35 of the LED lamp
be formed of resin material which will be liable to be
1 may
lowerimlstrengththannmtalnaterialafterthenmldingprocess.
Accordingly, everlwhen the connection portion (the t hole
in this embodiment) of the anti—drop wire 131 is formed
integrally with the housing 35, the tion portion can be
prevented from being damaged while the weight of the housing
is d.
Furthermore, in this embodiment, in order to locate the
support hole 134 at base 3 side than
a position nearer to the
the dead weight when the
the center—of—gravity position Gx of
radiation fin 25, weight
support hole l34'is provided to the heat
balance is designed so that the center—ofsgravity poSitiOn
to the light emitting
of the dead weight is located to be nearer
portion 12 side than the support hole 134. Accordingly,
support holes 134 can beprovided to the heat radiation fins.‘
f;5"’
‘25,: tWe t holes134 can be prevented from intrudinginto?
the lamp holder60 when theLED lamp1 ismounted inth’
holder 60,andthe antidrop Wire 131 can VConnectedgnIf,g.
to the support hole 134
In this embodiment the support hole134prOVided to the7
_ 60 i
heat ion fin 25 is exemplified as the connection portion
of the anti—drop wire 131. However, the present invention is
not limited to the support hole 134, and any structure may be
adopted insofar as the anti—drop wire 131 is connectable to the
structure.
Any member such as a rod—like or string—like member may
be d as the rop wire 131 r as it may be a support
member whose one end is connected and fixed to a stable place
of 60 the like to support
a building, the lamp holder or
LED lamp 1.
Next, to the base plate
a structure for fixing the globe 22
13 will be described.
22 to the base
A screwing structure for fixing the globe
13 is generally
plate 13 by screwing the globe 22 in the base plate
with
used as the fixing structure of the globe 22. However,
respect to the screwing structure, the globe 22 rotates at any
number of times when the globe 22 is fixed to the base plate
and thus it has a problem that the rotation of the globe
in the Owring 26,
22 twists an Oering 26 and causes tion
so that the sealing performance is lowered.
Therefore, according to this embodiment, the¥fitting
structure between they
a progection an d a grOOve isadopted as
fiXingstructureoftheglobeZZinplaceofthescrewingstructurefl
thereby suppressing the distortion of the O— ring 26 caused by.
the fixing Of the globe 22.
-61..
Fig. 16 is a cross—sectional View of the base plate 13.
As shown in Figs. 16 and l, the base plate 13 is formed
in a tray-like shape having a side wall 19 at the edge thereof.
A step portion 200 of one step is formed on the whole periphery
of the inner peripheral surface (inner surface) of the side wall
19. The step portion 200 is formed by projecting a lower end
with the upper
19B side of the side wall 19 ly as compared
end 19A side of the side wall 19 so that the lower end 198 side
. Plural guide
is larger in thickness than the upper end 19A side
andholdgrooves201areformedonalower—stageperipheralsurface
end 19B side of the
200A as the peripheral surface of the lower
step portion 200.
As shown in Fig. 3, the edge portion 22A of the globe 22
extends ally in a substantially cylindrical shape, and
plural projections 202 projecting outwards are formed on the
outer peripheral surface (outer surface) of the edge n
the globe 22 is fixed to the base
22A. When plate 13, the
22 are fitted
projections 202 of the edge portion 22A of the globe
201 of the side wall 19
and held in the guide and hold grooves
of the base plate 13
More speCifically, as ShOWHJJlFlg 16, the guideanuiholdjy‘
groove201 has an introduCing (guide)groove 201A anda hold
groove 201B. The introducing groove201A.lSEigrOOVe lntC)Wthhivy L
from theupperfjw
the projection 202 oft he glObe 22 isintroduced
end 19A side, and it is ed by forming a vertical grooveIW
-62—
on the lowerwstage peripheral surface 200A of the step portion
200. rmore, the hold groove 201B is a transverse groove
which is continuous with the introducing groove 201A and extends
in the eral direction Xs while moderately sloped downwards.
When the projections 202 of the globe 22 are inserted into
the introducing grooves 201A of the guide and hold grooves 201
to be introduced into the guide and hold grooves 201 and then
the globe 22 is turned, the projections 202 are moderately guided
downwards along the hold grooves 201B, and the globe 22 is pushed
into the base plate 13 side.
As shown in Fig. 17, a flange 203 is formed above the
projection 202 at the edge portion 22A of the globe 22. When
the projections 202 of the globe 22 are guided into the guide
the flange
and hold grooves 201 and pushed into the base plate 13,
wall
203 abuts t the upper end 19A of the side 19, so that
into the base plate
it is ible to further push the globe 22
13.,
13 and the globe 22 is held in the base plate
As described above, the O~ring 26 as an example of
seal member for preventing water invasion into the fitting place
between the globe 22 and the base plate 13 is provided between
the globe 22 and the base plate 13 O—ring 26 isnotymounted
.The
a the outer peripheralsurface ('t'heconfronting j
'wall 19) of the edge portion 22A of theglobe 22le
over. thewhole
an Oring fitting prejection 204 isprOVlded
~63~
ery of the edge portion 22A below the flange 203 of the
globe 22. The flange 203 and the O—ring fitting projection 204
of the globe 22 constitute an Oering fit~in groove 205, and the
Owring 26 is fitted in the O—ring fit—in groove 205.
Theo—rim326fitjx1the0~ringfit~ingroove205ispmeSSed
n the inner peripheral e of the side wall 19 of the
base plate 13 and the O—ring fit—in groove 205 when the globe
22issecuredtothebaseplatelB,therebysealingthegapbetween
the globe 22 and the base plate 13.
Furthermore, in this embodiment, as not shown, caulking
agent is injected into the 26 and the
gap between the O—ring
thereof
side wall 19 of the base plate 13 over the whole periphery
to construct a dUal seal structure; Furthermore, by injecting,
the caulking agent, the introducing groove 201A of the guide
and holding groove 201 is sealed, and the bore occurring in the
step portion 200 in top View due to the introducing groove 201A
is blocked by the introducing groove 201A. Accordingly, even»
when the globe 22 is loosened, the introducing groove 201A as
the exit for the projection 202 is blocked, whereby the globe
22 can be ted frOm dropping
In the Seal structure described above,when theglob;
amount is large’, the 0ring 26is eaSilytWisted and distorted
264-
by the rubbing from the side wall 19.
Therefore, according to this embodiment, as shoWn in Fig.
16, the extension length Lh in the eral ion Xs of
the hold groove 2018 of the guide and hold groove 201 is set
to be shorter than that of the whole periphery of the lower-stage
peripheral surface 200A, preferably set to be shorter than at
least the half peripheral length, and more preferably set so
that the rotational angle of the globe 22 when the globe 22 is
rotated while guided by the hold groove 2018 is equal to 30°.
Accordingly, as compared with the structure that the globe 22
is fixed to the base plate 13 by screwing, the rotation (turning)
amount of the globe 22 when the globe 22 is fixed is suppressed
totheupperlimitcorrespondingtothelengtthintheperipheral
direction Xs of the hold groove 201B, so that the distortion
of the O—ring 26 can be reduced, and degradation of the waterproof
mance can be prevented.
Fig. 18 is a m showing a comparative example in which
the globe 22 is screwed to the base plate 13.
As the screwing structure of the globe 22 may be considered
on the side wall
a structure that the step portion 200 is formed
19 of the base plate 13 a- screw grOoVe 210 is formed on then,‘
tage peripheral surface 200A of the step portion 200,212327*
2. ankdl the edge portion 22A of the globe 22 is screwed tothe screw .
grooVe 210 as shown in Fig18:. Astheseal structure uSing the;
O— ring 26 may be conSidered a structure that the02-ring 26 ism
-65..
mounted on the upper end face ZOOB of the step portion 200
shown
pressed by the flange 203 of the glove 22 for sealing as
in Fig. 18.
the O—ring 26 is ched between the However, globe
22 and the step n 200 of the base plate 13. Therefore,
when the screwing of the globe 22 is loosened and thus it moves
upwards even slightly with respect to the base plate 13,
press force of the globe 22 against the O—ring 26
is weakened
and the waterproof performance degrades.
Ontheotherhand,accordingtothisembodiment,theO-ring
fit~in grooVe 205
26 is fitted in the gap between the O-ring
and the side wall 19
of the edge portion 22A of the globe 22
of the base plate 13 . Therefore, even when the globe 22 upwardly
no great variation.occurs
moves vely to the base plate 13,
inthegapbetweentheO-ringfit~ingroove205oftheedgeportion
22 and the side wall 19 of the base plate
22A of the globe
26 is kept, so that the
and thus the press force of the O-ring
sealing performance is not weakened.
The projections 202 of the globe 22 are inferior
mechanicalstrengthtothescrewthreadsinthescreWingstructure
shown in Fig. 18. HOWever, under the fixed State Of theglobe
betweenv
22, the repulsive forceof the O—ring26 acts. ohthe gap
the edge portion 22A of theaglobeig}: V
the O— ring fit— in grOOVe 205 of
not“,
22 and the side wall 19 of the base plate 13, and it does
act so as to puSh up the flange 203 of the globe 22 from the
—66-—
step portion 200 of the side wall 1S9. Therefore, the repulsive
force of the O—ring 26 does not serve as a load on the projection
202,andthustheprojectionscanbepreventedfrombeingdamaged.
In the screwing structure of Fig. 18, the screw groove
210 is provided on the low—stage peripheral surface 200A.
Therefore, the lower—stage peripheral surface 200A projects
210A
inwardly by the amount corresponding to the screw thread
of the screw groove 210, which cause increase of the thickness
of the side wall 19. In addition, in order to keep the strength
to enlarge
of each groove of the screw groove 210, it is necessary
thus increase
the screw thread 210A in the height direction and
in increase of the
the ess n the grooves, resulting
height of the side wall 19.
As described above, in the screwing structure, the side
the volume
wall 19 is designed to be thick and high, so that
thereof is increased, the weight of the housing 35 is caused
fronts tional glass
to increase and the weight difference
bulb lamp is increased. Furthermore, since the side wall 19 is
ed to be high, the light shielding amount of light 212
emitted from LED 15 increases, and the light output ratio
(luminaire efficiency) is d.
it is
On the other hand, according to this embodiment,
ssary to provide the screw groove 210tothe Side wall;
wall 19 can;
19. Therefore, thethickness and height of theSlde
be suppressed, and the weight ofthe hou81ng 39 can bereduced
In addition, the light shielding amOunt of light of LED 15 can
be reduced, and the luminaire efficiency can be increased.
Furthermore, ing to this embodiment, as shown in
Fig. 17, the inner peripheral
a reflection face 215 is provided to
reflect light
surface of the edge n 22A of the globe 22 to
further
212 incident fronlthe LEE>15 to the side wall 19, thereby
increasing the luminaire ency.
Furthermore, the O~ring 26 is used as the seal member
sealingthegapbetweentheglobe22andthebaseplatelB. However,
or the like may be used
a packing member having another shape
as the seal member.
‘ The LED lamp 1 of this embodiment is used not only while
60 shown in Fig. l, but also while
mounted on the lamp holder
mounted on an exposed socket 65. When the socket 65 is set up
into the socket
outdoors, in order to prevent invasion of water
from
230 as shown in Fig. 19, thereby preVenting water invasion
an opening 65A of the socket 65.
Furthermore, the waterproof packing 230 has llty,t‘
rand fastens the cylindrical portion 2 of the LED lamp 1 andthe121
funct
secket 65. Therefore,thewaterproofpacking 230 has a
the 1; “
lam 1 to the socket65 and preventing
, of linking the LED
LED lamp 1 from dropping out of thesocket65Particularly,11
embodimenthaseasocketxnounti“k
the waterproof packing 230 Cf this
l 68 _
barrel portion 238 as a chest portion to be mounted on the socket
65, and the socket mount barrel portion 238 s its diameter
so as to firmly fasten the socket 65, y the waterproof
packing 230 is firmly joined to the socket 65.
However, the outer peripheral surface of the cylindrical
portion 2 of the LED lamp 1 is configured in a tapered surface
shape which is narrowed to the base 3. Accordingly, if no
countermeasure is taken, the engagement between the LED lamp
landthesocket65startsloosening,andtheclosecontactbetween
2 of the
the waterproof packing 230 and the rical portion
LEDlampl.degrades,sothatthewaterproofperformancedegrades.
1 and the
rmore, when the engagement between the LED lamp
socket 65 starts loosening, the ing of the cylindrical
portion 2 of the LED lamp 1 by the waterproof packing 230
the LED
weakened, so that the anti-drop function of preventing
lamp 1 from dropping out of the socket 65 is weakened.
Particularly, the LED lamp 1 has relatively high power,
of billboards
and it is suitably used for outdoor illumination
it is liable to
and outdoor light~up illumination. Therefore,
suffer vibration of vehicles running on a road near to the LED
lamp 1, and the ion may cauSe the engagement between the j.”‘
'poSitionf'
orthefiTlhfl"
higher than an illumination target such as abillboard
Side?
like and illuminates the illumination target fron1the upper
-69....
of the illumination target while the base 3 is postured to be
higher than the light emitting portion 12, force which makes
LED lamp 1 drop out of the socket 65 is applied to the LED lamp
1 due to the dead weight of the LED lamp 1 at all times . Therefore,
once the engagement n the LED lamp 1 and the socket 65
starts loosening, it immediately causes the LED lamp 1 to drop
out of the socket 65.
Therefore, according to this embodiment, as shown in Fig.
19, which
a convex portion 232 as a fitting structure portion.to
the upper edge n 230A of the waterproof packing 230 is
fittedisprovidedoverthewholeperipheryoftheouterperipheral
surface of the cylindrical portion 2 so as to be located at a
higher position than the base 3. In,addition, a concave portion
234 in which the convex portion 232 is fitted is provided over
the upper
the whole periphery of the inner peripheral surface of
edge portion 230A of the roof g 230.
Accordingly,evenwhentheengagementbetweentheLEDlamp
1 and the socket 65 is loosened, the upper edge portion 230A
of the water proof packing 230 continues to be fitted to the
convex portion 232 as the fitting Structure portion, and thus
the Furthermore,
roof performance does not degrade in__
order to allow the LED lamp 1 to drOp out Of the socket 65, thejr'
convex portion 232 of the cylindrical portion 2 is required tofi,_-
get OVer the e portiOn 234 cftheupper edgeportion 230A U
ofthewaterproofpacking230.-Therefore,theanti~dropfunction,5‘-"
l 70 _
of the LED lamp 1 can be continued.
Inaddition,thewaterproofpacking230andthecylindrical‘
portion 2 are fitted to each other by the convex portion 232
of the cylindrical portion 2 and the concave portion 234 of the
waterproof packing 230, whereby the sealing performance can be
achieved by the engagement between the convex portion and the
concave portion, and water on fronlthe upper edge portion
230A of the waterproof g 230 can be suppressed.
Furthermore, plural convex portions 236 are provided over
the whole periphery of the inner eral e of the
waterproof packing 230, and the convex portions 236 come into
contact with the outer peripheral surface of the cylindrical
portion2toenhancethesealingperformance. Stillfurthermore,
230 and the
the frictional force n the waterproof packing
cylindrical portion 2 is enhanced, thereby further enhancing
the anti—drop effect.
Theforegoingconstructionmaybemodifiedsothataconcave
is provided the fitting structure portion to the
portion as
cylindrical portion 2 in place of the convex portion 232 and
230A
alsc>a convex portion is ed to the upper edge portion
of the waterproof packing 230 in place of the COncave portion
234. Eurthermore,whenthelEDlamp].isusedindoors armcking 1
haVing waterproof properties such as the waterproofpacking 230
as it =’
is not necessarily used. Anymembermay be used insofar
isacylindricalmemberwhiChiSmountedonthecylindricalportion,
_ 71 _
2 of the LED lamp 1 to fasten the cylindrical portion 2 and has
2 to the socket
a structure for linking the cylindrical portion
obtained
As described above, the following s carxbe
by the foregoing embodiment.
That is, according to the embodiment, the O—ring 26 which
19 of the base
is pressed between the globe 22 and the side wall
is provided over the whole periphery of the outer
plate 13
22, the
peripheral surface of the edge portion 22A of the globe
and the guide
tions 202 are provided below the O—ring 26,
and hold groove 201 for introducing (guiding) the projection
19A the
202 of the globe 22 from the upper end side, guiding
202 in the peripheral direction and holding the
projection
surface of
projection 202 is provided on the inner eral
the side wall 19 of the base plate
According to this construction, as compared with the
uctbmioffixingtheglobebyscrewing,therotationamount
is fixed can
(turning amount) of the globe 22 when the globe 22
22 in
be reduced to the guide amount level of the projection
and hold groove 201.
the peripheral direction along the guide
when the globe is
Therefore, the distortion of the Seal member
fixed of the
can be reduced, and the degradation waterproof:
performance can be prevented.
Furthermore, ing to this embediment, the O~ring‘26
205 provided over the whole
is fitted in the-O-ring fit—in groove
-72..
periphery of the outer peripheral surface of the edge portion
22A of the globe 22, and the O—ring 26 is pressed between the
inner peripheral surface of the side wall 19 of the base plate
13 and the O—ring fit~in groove 205 to seal the gap between the
base plate 13 and the globe 22.
According to this construction, even when the globe 22
pwardswithrespecttothebaseplate13,nogreatvariation
in the gap between the O—ring fit—in groove 205 of the
occurs
edge portion 22A of the globe 22 and the side wall 19 of the
base plate 13, and the press force of the O—ring 26 is kept,
so that the sealing performance is not weakened.
Furthermore, the repulsive force of the O~ring 26 acts
between the Oering fit~in groove 205 of the edge portion 22A
of the globe 22 and the side wall 19 of the base plate 13, and
of the
thus there is not any force which acts on the flange 203
203 of the globe 22 from
globe 22 so as to push up the flange
thestepportionZOOofthesidewalll9. Therefore,therepulsive
force of the O—ring 26 is prevented from being applied to the
projections 202 as a load, and thus the projections 202 can be
prevented from being damaged.
Still rmore,according to thisembodiment, the VVK,*~
'"cldent, from; "
, yreflection face 215 for ting the light 212
' light‘shieldedby the's’idé‘w'a11i'1“9*ca'h'bé. uséd‘far"’iliumihatibn;r»
-73...
and the ire efficiency can be increased.
Still furthermore, the plural heat radiation fins 25
extending along the cylindrical porticme are arranged radially
around the cylindrical portion 2 on the back surface 13A of the
base plate 13 on which the LED board 16 having LEDs 15 mounted
thereon is mounted so that the gap S is provide between each
There are
heat radiation fin 25 and the cylindrical portion 2.
provided the joint portions 105 through which the end portions
two adjacent
at the cylindrical portioniZside of the respective
heat radiation fins 25 are joinecito each other, thereby forming
2 and each
the air flow path F between the cylindrical portion
joint n 2. Accordingly, the outer peripheral surface of
thecylindricalportbmuZcanbeair—cooledbyairpassingthrough
board 8
the air flow paths F, and the electrical circuit
in the cylindrical portion can be cooled.
accommodated
Particularly,thethermalconductivemember29Disprovided
between the g part 8X of the ical circuit board 8
the heat of the heating
and the cylindrical portion 2 to transfer
2. Therefore, the heat of
part 8X to the cylindrical n
the g part 8X of the electrical circuit board 8 can be
efficiently cooled, and the Circuit can be stably ed_“p.,
Furthermore,.according this; embodiment,
, to §7therj
of the -*x
distributing fisn 1 03 for distributing air streantto each
'adjacent open trapeZOidal fins lOI is prOVided between the/g._,
adjacent open trapezoidal fins 101.
-74..
According to this construction, the air stream passing
through the gap between the adjacent open trapezoidal fins can
distributed to each of the adjacent open oidal fins
101 by the distributing fin 103 located between the adjacent
open trapezoidal fins 101. Accordingly, unevenness of cooling
hardly'occurs on the outer‘peripheral surface of'the(:ylindrical
portion 2, and thus the cylindrical portion 2 can be uniformly
cooled.
According to this embodiment, the short heat radiation
fin 25 in the
fin 102 which is shorter than the heat radiation
ion length from the back surface 13A of the base plate
of the LED
13 (in the longitudinal cal) direction lamp
fins 25 tuting
1) is ed n the heat radiation
each open trapezoidal fin 101.
According to this construction, the heat
and LED 15 having
performance of the base plate 13 is assisted,
heat
higher power can be mounted. In addition, the short
than the heat
radiation fin 102 can be configured to be shorter
radiation fin 25, so that air flow in each open trapezoidal
101 is not disturbed, and the cooling performance of the open
trapeZOidal fins 101 whichlnainly.radiate heatLis notdisturbed
theoutSidei,giVle
Furthermore, according t o this embodiment,
annular fins 106and the inSide annular fins 107 as the plural ygfjt7t
'annular heat radiation fins which are shorter than the short,
heat radiation fins 102 in the extenSion length from the back
~75—
surface 13A (in the udinal (vertical) direction of the
LED lamp 1) and surround the cylindrical portion 2 are provided
on the back surface 13A of the base plate 13.
According to this construction, randomness occurs in the
air flow in each open trapezoidal fin 101 and between adjacent
open trapezoidal fins 101 by the e annular fins 106 and
the inside annular fins 107, and the retaining period of air
be enhanced.
is lengthened, so that the cooling performance can
According to this embodiment, the base plate 13 to which
fins 25 formed
LEDs 15 are secured and the plural heat radiation
13 are molded integrally
on the back surface 13A of the base plate
with each other by using resin, and the base plate 13 and the
heatradiationfinsZSareconfiguredsoastokxagraduallythinner
from the inner periphery to the outer periphery f.
Accordingly,theheatradiationfins25arethickeronthethicker
side f, and thinner
base plate 13 at the inner peripheral
the outer eral side thereof.
on the thinner base plate at
Therefore, occurrence of sink (shrinkage) of resin at the fin
rootportions25Bcfiftheheatradiationfins25<n1thebacksurface
13A of the base plate 13 can be prevented,
and the flatness of
the base plate 13 can be enhanced, thereby radiating heath
efficiently
' Furthermore, the strength 0£ the heat radiation fins25f}5'”
hi.2
can be Secured by the thick base plate 13and the thick heath
radiation fins 25 at the inner peripheralside cfthe base plate
'76-
13, and the heat radiation performance can be enhanced by the
thin base plate 13 and the thin heat radiation fins 25 at the
outer peripheral side.
Still furthermore, according to this embodiment, a larger
side light
number of LEDS 15 are provided to the outer-peripheral
emitting portion 15A at the outer peripheral side of the base
plate 13 than the inner-peripheral side light emitting portion
158 at the inner peripheral side of the base plate Although
at the outer peripheral side is
the amount of generated heat
larger,thebaseplate13attheouterperipheralsideisconfigured
tobethinner,andthustheheatresistanceattheouterperipheral
side of the base plate 13 is smaller, so that the heat can be
ently radiated.
Stillfurthermore,accordingtothisembodiment,thelength
in the axial (height) direction of the heat radiation fins 25
13. Therefore, the
13 to the outer periphery of the base plate
radiation fins 25 is larger
bending moment acting on the heat
at the inner eral side of the base plate 13 and smaller
the base plate 13. However, the
at the outer peripheral side of
base plate 13 and the heat radiation fins 25 are configured
be gradually thinner from the inner periphery tothe outer
13 and the heat radiation fins-gay
ery, an d the base plate
can be made r Therefore, both the strength and the
fins 25 can
heat radiation performance. of the heat radiation
l 77 _
be performed.
Still furthermore, according to this embodiment, the
thickness of the heat radiation fins 25 is gradually reduced
from the back surface 13A of the base plate 13 to the base 3
side. Therefore, the slope surface of the heat radiation
functions as a release taper at a demolding step, so that
the resin g of the base plate 13 and the heat radiation
fins 25 can be easily performed.
lead
According to this embodiment, the)3ase23tc>which the
is provided
wires 21A and 21B extending from LED 15 are connected
the of
to the tip of the insulating cylinder portion 10, tip
theinsulatingcylinderportion10isconfiguredasthebagportion
33 which is engaged
120, the terminal 10A having the screw n
with the base 3 is provided on the outer periphery of the tip,
the bag portion 120 of the tip is projected to the upper
outer side of the end face 123A of the terminal 10A, and the
which the
wire holes 125A and 125B as the h—holes through
to the projecting
lead wires 21A and 21B penetrate are provided
TherefOre, even
portions 122A and 122B of the bag portion 120.
the like adheres to the
when water such as dew condensation or
neighborhood of the terminal lOA, thewater hardly intrudes intof::'
122A
the wire holes 125Aand 125Bof the ting portions
ZBprOJectingtotheoutSideoftheendface123A;33
theWire holes 125A g ,g3
water Can beprevented from invadingfrom _
and 125B into the housing 35 of the LED lampI
According to this ment, the pair of introducing
portions 127A and 1278 for leading the pair of lead wires 21A
and 218 into the wire holes 125A.and 1258 are formed on the inner
e of the bag portion 120, and the introducing portions
127A and 127B are separated from each other by the ion
wall 126 for bisecting the inner surface of the bag portion 120.
Therefore, the wire leads can be surely guided.to the wire holes
125A and 1258 corresponding to the introducing portions 127A
and 1278 by the pair of introducing portions 127A and 127B formed
by bisecting the inner surface of the bag portion 120 through
the partition wall 126, and the assembling performance of the
lead wires 21A and 218 can be enhanced.
Still furthermore, according to this embodiment, the
introducing portions 127A and 1278 are conical concaves which
and the lead wires
are d to the wire holes 125A and 1258,
21A and 218 can be easily passed through the wire holes 125A
and 1258 along the conical shapes.
Furthermore, the wire groove 34 in which the lead wire
outside
218 passed through the wire hole 1258 and drawn out to the
edisformedontheouterperipheralsurfaceoftheterminal
10A, and the bag portion 120 projects to the upper and outer
SidecflftheWiregroove34 Therefore,water111theneighborhoodj.V5
of the wire groove 34 can be suppressed from invadingfrom then
wire holes 125A, 1258 of the bag portion 120 into the houSing
of the LED lamp 1.
-79..
Furthermore,accordingtotheaboveembodiment,theplural
heat radiation fins 25 formed on the base plate 13 are provided,
the pin 130 is bridged between the two heat radiation fins
andtheanti~gropwirel3lisconnectedtothepinl30. Therefore,
the simple structure
the antiwdrop wire 131 can be connected with
that the pin 130 is bridged between the heat ion fins
heat radiation fins
and the pin 130 is provided between the two
,sothatthepinl30canbefirmlyprovidedtotheheatradiation
fronldropping
fins 25, and the LED lamp e surelyrprevented
out. Furthermore,itisunnecessarytoprovideadedicatedmember
for fixing the pin 130.
this embodiment, the heat
Furthermore, according to
radiationfins25betweenwhichthepinlBOisbridgedarearranged
ntiallyix1paralleltoeachother,thepflxll30issupported
throughthesupporthcles134formedinthesubstantiallyparallel
heat radiation fins 25, and the support holes 134 can be easily
formed in the substantially parallel heat radiation fins
Therefore,thepin130canbesimplyprovidedtotheheatradiation
fins 25.
according to this embodiment, the
Still furthermore,
anti—drOp wire l3l is joined to thiei band l33 wound aroundLithei
the LED lamp l Therefore, the LEDlamp1 can.befpreven
I then
dropping With a Simpleconstruction that
around the outer peripheral surfaceof the lamp holder 60 and
- 80 _
the rop wire 131 is connected to the band 133. Since the
band 133 is wound around the lamp holder 60, the band 133 is
ble to lamp holders having various shapes.
The LED lamp 1 is screwed to the socket 65 of the lamp
holder60byrotatingtheLEDlamp1. Thebandl33hastheadjusting
of the band
portion 136 which can adjust the constriction force
133,andifluabandl33:usrotatablecnltheouterperipheralsurface
force of
of the lamp holder 60 by loosening the constriction
theband133. Therefore,theanti-dropwire13l<xu1beoonnected
to the band 133, and the band 133 is slightly loosened so as
surface of the lamp
to be rotatable around the outer peripheral
holder 60. Under this state, the work of attaching/detaching
the LED lamp 1
the Led lamp 1, so
can be performed by rotating
that the LED lamp 1 can be prevented from dropping during
attaching/detaching work.
‘According to this embodiment, the convex portion 232 as
is configured to be fitted
the fitting structure portion which
the cylindrical member having
to the waterproof packing 230 as
2 to the socket
the function of linking the cylindrical portion
ovidedcnitheouterperipheralsurfacecflfthecylindrical
portion 2.
ingly,evenwhentheengagementbetweentheLEDlamp
l and the socket 65 is loosened, the upper edge portion 230A
ofthewaterproofpacking230continuestXJbefittedtothecmnvex
portion232asthewaterproofpackingfittingportion. Therefore,
i 81 _
the waterproof performance does not degrade, and the anti-drop
effect of the LED lamp 1 is prevented from being lost by the
fitting between the upper edge portion 230A of the waterproof
packing 230 and the convex portion 232 as the waterproof packing
fitting portion.
Furthermore,accordimgtothisembodiment,thewaterproof
fitting portion is constructed by the convex portion
packing
230Atof the waterproof
232 tc>be fitted to the upper edge portion
portion
packing 230 over the whole periphery of the cylindrical
the sealing mance is obtained by the
2. ore,
the engagement between the convex portion 232 of rical
the waterproof packing 230, and water on
portion 2 and
of the waterproof packing 230
from the upper edge n 230A
can be suppressed.
Stillfurthermore,accordingtothisembodiment,theconvex
of the inner
portion 236 is provided over the whole periphery
230. Therefore,
peripheral surface of the waterproof packing
the waterproof performance can be enhanced.
embodiment, the support holes 134 as
According to this
the anti—drop wire l31 is
the connection ns to which
connected are prOVided between the light emitting portionlZl.
'and the the base 3t
base 23 so as it’o be nearerto
of the dead weight of the LEDlamp
center-ofgravitypOSition Gx
According to this constrUCtiOn, even when the-LED lampikf
_ 82 i
l drOps out of the socket 65 under the state that the LED lamp
1 is mounted on the socket 65 while the bees 3 is ed to.
beverticallyhigherthanthelightemittingportiontoilluminate
the lower side, the center—of~gravity position Gx of the dead
holes
weight has been already vertically lower than the support
of turning of the LED lamp 1 caused by 134, so that the amount
width of the LED lamp
the drop—out can be reduced and the swing
lcausedbyifluaturningcankxareduced. Accordingly,impingement
such as a billboard
of the LED lamp 1 against an nation target
of the LED lamp 1 can
or the like existing in the neighborhood
be d, and even when the LED lamp impinges against the
illumination target, the impact caused by the impingement can
be suppressed.
the holes 134
Furthermore, in this embodiment, support
radiation fins 25. Therefore, when the
are provided to the heat
the lamp holder 60, the support
LED lamp 1 is used while mounted on
and the anti-drOp
holes 134 do not intrude in the lanm>holder 60,
wire 131 to 134.
can be simply connected the support holes
foregoing embodiment is an example of the t
be made to
invention, and any cation and application may _
fromth: subject matteriéfleffpf
the above embodiment Withoutdeparting
’ofiythejpresent,inventionVi;ptlffiflgfhl‘
Claims (21)
1. A lamp including a board having light emitting elements mounted thereon, a flat plate portion having the board mounted thereon, and a rical n that extends from the back surface of the flat plate portion, has a base provided to the terminal f and contains an electrical circuit board therein, comprising: a plurality of heat radiation fins that are arranged radially around the cylindrical portion on the back surface of the flat plate portion and configured to extend along the of the cylindrical n so that a gap is formed between the cylindrical portion and each heat radiation fins; and side of at least two a joint n forjoining end portions at a cylindrical portion and the paired heat radiation fins to form an air flow path between the rical portion joint portion.
2. The lamp according to claim 1, r comprising a buting fin that is air stream to each disposed between adjacent pairs of heat radiation fins to bute an of the adjacent pairs of heat ion fins.
3. The lamp according to any one of claim 1 or 2, further comprising a short heat heat radiation fins joined radiation fin that is provided between the respective paired than the heat radiation fins in the through the joint portion and configured to be r extension length from the back surface of the flat plate portion. of annular heat
4. The lamp according to claim 3, further comprising a plurality of the flat plate portion so as to radiation fins that are arranged on the back surface surround the cylindrical portion and configured to be shorter than the short heat radiation of the flat plate portion. fins in the extension length from the back surface 1 to 4, further comprising a thermally
5. The lamp according to any one of claims of the electrical circuit board conductive member that is provided between a heating part to the cylindrical portion. and the rical portion to transfer heat of the heating part
6. The lamp according to claim 1, wherein each of the heat radiation fins is molded with the flat plate portion, and on the back surface of the flat plate portion integrally side to the outer peripheral configured to be gradually thinner from the cylindrical portion side. 6975573__1
7. The lamp according to claim 6, wherein a larger number of light emitting elements are provided at the outer side of the board that that at the center side of the board.
8. The lamp according to claim 6 or 7, wherein the heat radiation fins are ured so that the ion length thereof along the cylindrical portion is gradually reduced from the cylindrical portion side to the outer peripheral side.
9. The lamp according to any one of claims 6 to 8, wherein the ess of the heat ion fins is gradually reduced from the back surface side of the flat plate portion to the base side.
10. The lamp according to claim 1, further comprising a globe covering the board of the flat plate portion, wherein the flat plate portion is configured in a tray-like shape having a side wall at the edge thereof, an edge portion of the globe is fitted to the side wall, the fitting portion between the edge portion of the globe and the side wall is sealed outer by a seal member, the seal member is provided over the whole periphery of the of the surface of the edge portion of the globe so as to be pressed between the side wall below the flat plate portion and the edge portion of the globe, a projection is provided seal member, and a guide and hold groove for introducing the projection of the globe to hold the from an upper end side and guiding the projection in a peripheral direction globe.
11. . The lamp according to claim 10, n a fit-in groove is ed over seal whole periphery of the outer surface of the edge n of the globe, and the the inner member is fitted in the fit-in groove so that the seal member is pressed between surface of the side wall of the flat plate portion and the fit-in groove to seal the fitting portion between the sidewall of the flat plate portion and the edge portion of the globe.
12. The lamp according to claim 11, further comprising a reflection face for the edge reflecting light of the light emitting ts is provided on the inner surface of portion of the globe.
13. The lamp according to claim 1, wherein the cylindrical portion is configured to be thinner from the flat plate portion side to the base side, a cylindrical member for g the cylindrical portion to a socket to which the base is screwed is mounted on the outer eral surface of the cylindrical portion, and a fitting structure portion to be fitted to 6975573__1 the cylindrical member when the cylindrical member is mounted is provided to the outer eral surface of the cylindrical portion.
14. The lamp according to claim 13, wherein the rical member is a waterproof g that covers an area extending from the socket having the base mounted thereon to the cylindrical portion to prevent water invasion n the base and the .
15. The lamp according to claim 14, wherein the fitting ure portion is provided with a convex portion or a concave portion to which an upper edge portion of the waterproof packing is fitted over the whole periphery of the rical portion.
16. The lamp according to claim 14 or 15, wherein a convex portion is provided over the whole periphery of the inner peripheral surface of the cylindrical member.
17. The lamp according to claim 1, wherein a connection member is bridged between at least two heat radiation fins, and an anti-drop support member is connected to the connection member.
18. The lamp ing to claim 17, wherein the heat radiation fins bridged by the connection member are provided substantially in parallel to each other, a hole n formed in each of the ntially parallel heat radiation fins so as to penetrate through the heat radiation fin, the connection member is configured in a rod-like shape, and therod—like connection member is supported through the hole portions of the substantially parallel heat radiation fins.
19. The lamp according to claim 17 or 18, wherein the connection member is joined to a band wound around the outer peripheral surface of a lamp holder for supporting lamp.
20. The lamp according to claim 19, wherein the lamp is rotated to be screwed to the lamp , and the band has an adjusting portion for adjusting constriction force the band, and is allowed to be rotatable on the outer peripheral surface of the lamp holder by loosening the constriction force of the band.
21. The lamp according to any one of claims 17 to 20, wherein the connection member is provided between the flat plate portion and the base so as to be nearer to the base than the center-of—gravity position of the dead weight of the lamp. 6975573
Applications Claiming Priority (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011-223345 | 2011-10-07 | ||
JP2011-223364 | 2011-10-07 | ||
JP2011223343A JP5862179B2 (en) | 2011-10-07 | 2011-10-07 | lamp |
JP2011-223361 | 2011-10-07 | ||
JP2011-223342 | 2011-10-07 | ||
JP2011223344A JP2013084435A (en) | 2011-10-07 | 2011-10-07 | Lamp |
JP2011-223344 | 2011-10-07 | ||
JP2011-223343 | 2011-10-07 | ||
JP2011223342A JP5737120B2 (en) | 2011-10-07 | 2011-10-07 | lamp |
JP2011223345A JP5772473B2 (en) | 2011-10-07 | 2011-10-07 | lamp |
JP2011-223360 | 2011-10-07 | ||
JP2011223361A JP5772474B2 (en) | 2011-10-07 | 2011-10-07 | lamp |
JP2011223360A JP5790389B2 (en) | 2011-10-07 | 2011-10-07 | lamp |
JP2011223364A JP5834744B2 (en) | 2011-10-07 | 2011-10-07 | lamp |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ602789A NZ602789A (en) | 2013-04-26 |
NZ602789B true NZ602789B (en) | 2013-07-30 |
Family
ID=
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