JP2008311188A - Led lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED lamp which is excellent in light diffusion characteristics and can illuminate in a wide range. <P>SOLUTION: The LED lamp has a plurality of LEDs 6. The plurality of LEDs 6 include a plurality of kinds with different light-emitting wavelengths, wherein optical axes of at least part of the plurality of kinds of LEDs 6 extend in the first direction; optical axes of at least part of the plurality of kinds of LEDs 6 extend in the second direction different from the first direction; and optical axes of the balance in the various kinds of LEDs 6 extend in the third direction different from the first and second directions. The plurality of kinds of LEDs 6 include the LEDs having a green light-emitting wavelength to which a human eye is more sensitive at the dark, and the LEDs having a yellow light-emitting wavelength which is complementary to the green light-emitting wavelength. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an LED lamp including a plurality of light emitting diodes (hereinafter referred to as “LEDs”).

  In recent years, to reduce global warming, reducing carbon dioxide emissions has become one of the major environmental themes of the world. The amount of carbon dioxide emission is proportional to the amount of power used, and as the amount of power used increases, the amount of carbon dioxide emissions increases proportionally.

Against this background, LED lamps using LEDs have been proposed as illumination lamps with low power consumption (see, for example, Patent Document 1 and Patent Document 2). This LED lamp has a hollow cylindrical lamp body, an LED board is mounted in the lamp body, a plurality of LEDs are mounted on the LED board at intervals, and lighting for lighting the plurality of LEDs is performed. A circuit is implemented. In addition, terminal portions are provided at both ends of the lamp body, and these terminal portions are detachably attached to the fluorescent lamp socket, and power supplied from the fluorescent lamp socket through the terminal section is supplied to a plurality of LEDs through the lighting circuit. The plurality of LEDs are turned on by the electric power supplied and thus supplied.
JP 2001-351402 A JP 2007-12322 A

  However, the conventional LED lamp has the following problems to be solved. First, fluorescent lamps emit light from the whole lamp, so that the light diffuses to the surroundings and has excellent light diffusion characteristics. On the other hand, when an LED with a lens is used as the LED of the LED lamp, the light is diffused by the lens. Therefore, there is a problem that the light emission angle of the LED is narrow and the light diffusion characteristics are deteriorated. Therefore, if an LED lamp is used instead of a fluorescent lamp, light diffusion characteristics are poor and it is difficult to illuminate the surroundings brightly.

  Second, when a white lamp such as a fluorescent lamp is used as the illumination lamp, the wavelength of the light is substantially constant in the range of about 400 to 700 nm. In general, human vision under night illumination is known to have high sensitivity to green light and yellow light. When a white lamp is used as night illumination (for example, a security light), light components with low visual sensitivity are used. Therefore, the use efficiency of the illumination light is deteriorated, and making the illumination light white consumes power wastefully from the viewpoint of visual sensitivity.

  Third, it is known that when a white lamp is used as an illumination lamp, for example, in a security light, white light from a fluorescent lamp lamp has various adverse effects on plants. For example, in short-day rice plants, heading delays are caused by night lighting such as crime prevention lights, and it is said that the effect appears most strongly in the period of 20 to 40 days before heading. In addition, spinach has a light-sensitive property, so when exposed to nighttime lighting, a “tow” is quickly established and its commercial value is lost.

  A first object of the present invention is to provide an LED lamp that has excellent light diffusion characteristics and can be illuminated over a wide range.

  In addition, a second object of the present invention is to provide an LED lamp that emits light suitable for human visual sensitivity and can improve the efficiency of using light for nighttime illumination.

  Furthermore, the 3rd objective of this invention is providing the LED lamp which can suppress the bad influence to the plant by illumination light.

  In the LED lamp according to claim 1 of the present invention, the plurality of LEDs include a plurality of types having different emission wavelengths, and at least some of the optical axes of the plurality of types of LEDs extend in the first direction, The optical axis of at least a part of the remaining part of the LED extends in a second direction different from the first direction.

  In the LED lamp according to claim 2 of the present invention, at least a part of the optical axes of the remaining portions of the plurality of types of LEDs extend in a second direction different from the first direction, and the remaining portions of the remaining types of the plurality of types of LEDs remain. The optical axis extends in a third direction different from the first and second directions.

  Further, in the LED lamp according to claim 3 of the present invention, the plurality of LEDs are provided with a plurality of types having different emission wavelengths, and the plurality of types of LEDs have a green emission wavelength with high sensitivity of human eyes in a dark place. And a yellow light emitting wavelength complementary to the green light emitting wavelength.

  Further, in the LED lamp according to claim 4 of the present invention, the plurality of LEDs are configured to emit light having a wavelength of 500 to 600 nm which is not effective for plant photomorphogenesis, and at least part of light of the plurality of types of LEDs. The axis extends in the first direction, and at least some of the optical axes of the remaining portions of the plurality of types of LEDs extend in a second direction different from the first direction.

  Moreover, in the LED lamp according to claim 5 of the present invention, the plurality of LEDs are configured to emit light at wavelengths of 400 to 490 nm and / or 610 to 680 nm, which are effective for plant photomorphogenesis. An optical axis of at least a part of the LED extends in a first direction, and an optical axis of at least a part of the remaining part of the plurality of types of LEDs extends in a second direction different from the first direction.

  Furthermore, in the LED lamp according to claim 6 of the present invention, the plurality of LEDs emit light at a wavelength of 500 to 600 nm which is not effective for plant photomorphogenesis and 400 to 400 which is effective for plant photomorphogenesis. It is comprised from what emits light with a wavelength of 490 nm and / or 610-680 nm.

  According to the LED lamp of the first aspect of the present invention, since the plurality of LEDs include a plurality of types having different emission wavelengths, the light from the LED lamp becomes a composite color of the plurality of types of LEDs, and night illumination It can be used for a lamp (for example, a security light). Further, since some of the optical axes of the plurality of LEDs extend in the first direction and at least some of the remaining optical axes extend in the second direction, the light from the LED lamp spreads over a wide range, Instead of the conventional fluorescent lamp, it can be used as a night illumination lamp.

  According to the LED lamp of the second aspect of the present invention, at least some of the optical axes of the remaining portions of the plurality of types of LEDs extend in the second direction, and the remaining optical axes of these remaining portions are the third ones. Since it extends in the direction, the optical axes of the plurality of LEDs extend in the first to third directions, which further enhances the light diffusibility of the LED lamp, which is more desirable as an illumination lamp. For example, using an LED with a light distribution angle of 60 degrees, the first direction is the vertical direction, the second direction is 45 degrees to the predetermined direction with respect to the vertical direction, and the third direction is the vertical direction. When the direction is 45 degrees opposite to the predetermined direction, the LED lamp illuminates over an angle range of 75 degrees (a total angle range of 150 degrees) on both sides centering on the vertical direction, and an illumination lamp (for example, crime prevention) The lamp has sufficient light distribution.

  According to the LED lamp of claim 3 of the present invention, the plurality of types of LEDs include those having a green emission wavelength and those having a yellow emission wavelength that complements the green emission wavelength. The lamp emits a wavelength that increases the sensitivity of the human eye in the dark, and is highly efficient for the human eye. As a result, an LED lamp with low power consumption is provided as a security light. Can do. For example, by making the LED of the LED lamp have a green emission wavelength and a yellow emission wavelength, the above-described effects can be further enhanced.

  According to the LED lamp of claim 4 of the present invention, since the plurality of LEDs are configured to emit light at a wavelength of 500 to 600 nm which is not effective for the light morphogenesis of plants, the LED lamp is turned on as night illumination. However, it does not adversely affect plants and inhibits food growth. Further, since at least some of the optical axes of the plurality of types of LEDs extend in the first direction and at least some of the remaining optical axes extend in the second direction, the LED having excellent light distribution characteristics. Can be provided as a lamp.

  Moreover, according to the LED lamp of Claim 5 of this invention, several LED is comprised from what is light-emitted by the wavelength of 400-490 nm and / or 610-680 nm which are effective for the photomorphogenesis of a plant. Therefore, photosynthesis by illumination light is promoted and can be conveniently applied as an illumination lamp for electric cultivation (for example, for electric chrysanthemum cultivation). Moreover, since the optical axis includes the LEDs extending in the first and second directions, an LED lamp having excellent light distribution can be provided.

  Furthermore, according to the LED lamp of the sixth aspect of the present invention, the plurality of LEDs emit light at a wavelength of 500 to 600 nm that is not effective for plant photomorphogenesis, and are effective for plant photomorphogenesis. Since it is configured to emit light at a wavelength of 400 to 490 nm and / or 610 to 680 nm, light is emitted at a wavelength of 400 to 490 nm and / or 610 to 680 nm when the sunshine time is artificially increased in plant cultivation. It is possible to adjust the shipping time while maintaining the growth of the plant by turning on the LED to be turned on, and also when turning on the LED that emits light at a wavelength of 500 to 600 nm at the time of maintenance at night, preparation for shipment, etc. It is possible to adjust the shipment by performing these operations without adversely affecting the product.

  Hereinafter, the best embodiment of an LED lamp according to the present invention will be described with reference to the accompanying drawings. 1 is a front view showing an LED lamp according to an embodiment, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. 3 shows a light distribution curve of the LED lamp in FIG. FIG. 4 is a diagram schematically illustrating an LED arrangement form in the LED lamp, and FIG. 5 is a cross-sectional view illustrating an LED arrangement example of the LED lamp.

  1 and 2, the illustrated LED lamp 2 includes an elongated lamp body 4 having a hollow cylindrical shape, and a plurality of LEDs 6 (light emitting diodes) are disposed in the lamp body 4 in the longitudinal direction (left and right directions in FIG. 2 in a direction perpendicular to the paper surface). The lamp body 4 is made of a transparent or translucent material such as a transparent synthetic resin or glass. Terminal portions 8 are attached to both ends of the lamp body 4, and these terminal portions 8 are detachably attached to a fluorescent lamp socket (not shown). The LED lamp 2 is a straight tube type in a conventional fluorescent lamp fixture. It is used in place of the fluorescent lamp.

  In this embodiment, a support member 10 is attached in the lamp body 4. The support member 10 is composed of a member having a substantially U-shaped cross section, and extends in the longitudinal direction of the lamp body 4 over substantially the entire length. An elongated LED substrate 12 is mounted in the support member 10, and the LED substrate 12 extends from one end portion to the other end portion of the support member 10, and a current for lighting the LED 6 at one end portion of the LED substrate 12. A control circuit 13 is provided.

  The plurality of LEDs 6 are arranged on the LED substrate 12 as follows. In this embodiment, as shown in FIG. 2, the plurality of LEDs 6 are composed of three LED sets 14A, 14B, 14C. These LED sets 14A, 14B, 14C It is configured as follows. In general, in a lens-equipped LED used for illumination or the like, the light distribution of a wide-angle type has a spread of about 60 degrees, and +30 degrees to -30 degrees about its optical axis (the central axis of emitted light). Light is distributed over an angular range, and a single LED can obtain only about 60 degrees of light diffusivity. However, in this embodiment, the LED lamp 2 has about 150 as the LED lamp 2 by making the optical axes of the plurality of LEDs 6 in a plurality of directions. The light diffusion characteristics of the degree are obtained.

  Referring also to FIG. 3, in this embodiment, the LEDs 6 of the LED set 14 </ b> A are vertically downward (in the state where the LED lamp 2 is attached to the fluorescent lamp socket as required) with their optical axes in the first direction. The LED 6 of the LED set 14B is attached to the LED board 12 so as to extend vertically downward), and the optical axis of the LED 6 is different from the first direction in the second direction (with respect to the first direction, FIGS. 2 and 3). The LED 6 of the LED set 14C is attached to the LED board 12 so as to extend in the direction inclined 45 degrees to the left side in FIG. 2 and 3 is attached to the LED substrate 12 so as to extend in a direction inclined 45 degrees to the right in FIGS. 2 and 3.

  The LED 6 of the LED groups 14A, 14B, and 14C is configured by a general LED with a lens, and the light distribution is an angular range of about 60 degrees around the optical axis. By using such an LED 6, the LED 6 of the LED set 14A emits light as shown by 16A in FIGS. 2 and 3, and the LED 6 of the LED set 14B is 16B in FIG. 2 and FIG. As shown, light is emitted so as to be distributed, and the LED 6 of the LED set 14C emits light so as to be distributed as indicated by 16C in FIGS. Therefore, as shown in FIG. 3, the combined light distribution of the LEDs 6 of the LED groups 14A, 14B, and 14C, that is, the light distribution from the LED lamp 2 is as shown by the solid line 18, and the LED 6 of the LED group 14A. The light is distributed over an angle range of 150 degrees around the optical axis, and sufficient light distribution characteristics can be obtained as an illumination lamp, particularly a security light lamp. In addition, although the inclination angle of the LED 6 of the LED sets 14B and 14C is set to 45 degrees, the light distribution of the LED lamp 2 can be adjusted by changing the inclination angle. If set to 30 degrees, the light distribution angle of the LED lamp 2 is 120 degrees.

  When the above-described LED lamp 2 is applied as a lamp for a security light, a street light, or the like, it is preferable that the LED sets 14A, 14B, and 14C are configured as follows. The LEDs 6 of the LED sets 14A, 14B, and 14C are configured in substantially the same manner. In this embodiment, the following two types of LEDs 6 are configured in consideration of the sensitivity of the human eye in a dark place. FIG. 8 shows a specific visibility curve that is generalized in the optical field. The wavelength sensitivity in the dark place is different from the wavelength sensitivity in the bright place. The sensitivity of the human eye is different from that in the dark place. Light having a wavelength of 507 nm has a sensitivity peak, and light having a wavelength of 555 nm has a sensitivity peak in a bright place. For this reason, an LED that emits light having a wavelength around the peak of the relative visibility curve in a dark place is selected as one type of LED 6 in the LED groups 14A, 14B, and 14C, and the green emission wavelength ( For example, a wavelength in the range of about 520 to 530 nm, for example, a wavelength indicated by a symbol a of 525 nm)) is used.

  When only the LED having the green emission wavelength is used as the LED lamp 2, the appearance of light is biased because it is illuminated with light of a single wavelength, and in order to eliminate such a bias, the LEDs 6 of the LED groups 14 </ b> A, 14 </ b> B, 14 </ b> C are used. As another type, a yellow light emission wavelength (for example, a wavelength range of 585 to 595 nm, for example, a wavelength indicated by symbol 590 nm) for complementing the green light emission wavelength is used. In this way, by using a combination of the green emission wavelength and the yellow emission wavelength, it is possible to increase the relative visibility in the dark place while eliminating the bias in the appearance, and thereby the light of the LED lamp 2 can be increased. This makes it possible to increase the power usage efficiency and further reduce power consumption.

  The arrangement and configuration of the LED sets 14A, 14B, and 14C of the LED lamp 2 are configured as shown in FIGS. 4A to 4D, for example. 4A to 4D, the black LED 6a indicates a green light emission wavelength, and the white LED 6b indicates a yellow light emission wavelength.

  In the form shown in FIG. 4A, the LED sets 14A, 14B, 14C are arranged in this order from one end of the LED substrate 12 to the other end (from left to right in FIG. 4A). Each LED set 14A, 14B, 14C is composed of one green light emitting wavelength LED 6a and one yellow light emitting wavelength LED 6b. With this configuration, the green light emission component and the yellow light emission component of the LED lamp 2 can be made substantially the same.

  In the form shown in FIG. 4B, the LED sets 14A, 14B, and 14C are arranged in this order from one end of the LED substrate 12 to the other end (from left to right in FIG. 4B). Each LED set 14A, 14B, 14C is composed of two LEDs 6a having a green emission wavelength and one LED 6b having a yellow emission wavelength. With this configuration, the green light emission component of the LED lamp 2 can be strengthened.

  In the form shown in FIG. 4C, the LED sets 14A, 14B, 14C are arranged in this order from one end of the LED substrate 12 to the other end (from left to right in FIG. 4C). Each LED set 14A, 14B, 14C is composed of one green light emitting wavelength LED 6a and two yellow light emitting wavelength LEDs 6b. By comprising in this way, the yellow light emission component of the LED lamp 2 can be strengthened.

  4D, the LED sets 14A, 14B, and 14C are arranged so that the LED sets 14B and 14D are alternately arranged between the pair of LED sets 14A. 14A, 14B, and 14C are comprised from LED6a of one green light emission wavelength, and LED6b of one yellow light emission wavelength.

  By using the LED lamp 2 described above, adverse effects on plants can be reduced. The first is due to the structure capable of adjusting the illumination angle (light distribution angle). That is, as understood from the above description, the LED 6 of the LED set 14A has an optical axis extending in the first direction by straightening the lead terminal, and the LED 6 of the LED set 14B is bent by bending the lead terminal in a predetermined direction. The optical axis extends in the second direction, the LED 6 of the LED set 14C is bent in the third direction by bending the lead terminal in a direction opposite to the predetermined direction, and the bending of the lead terminal of the LED 6 in the LED sets 14B and 14C. By changing the degree, the illumination angle (light distribution angle) of the LED lamp 2 can be changed to adjust the illumination area, and unnecessary light leakage or the like can be prevented.

  The second is that the illumination light from the LED lamp 2 does not contribute much to the photosynthesis of plants. In general, the absorption spectrum of chlorophyll in plants is as shown in FIG. 9, and there are peaks at a blue wavelength of 430 to 460 nm and a red wavelength of 650 to 660, and these wavelengths effectively act on photosynthesis. However, green wavelengths (eg, about 520 to 530 nm) and yellow wavelengths (eg, 585 to 595 nm) have low absorption spectra, and these wavelengths hardly affect photosynthesis. This means that it hardly contributes to photomorphogenesis. Plant photomorphogenesis refers to qualitative changes such as seed germination, flower bud differentiation, flowering, pre-leaf development, chlorophyll synthesis, internode elongation, etc. Blue light and red wavelength light components are included in this photomorphogenesis. The use of light components of green and yellow wavelengths makes little contribution to this photomorphogenesis and can be expected to reduce the impact on plant physiology.

  It can replace with the LED lamp 2 shown in FIGS. 1-3, for example, can also be comprised as shown to Fig.5 (a) and (b). In the LED lamp 2A shown in FIG. 5A, the plurality of LEDs 6 are composed of three sets of LED sets 14A, 14B, and 14C as described above, but the light of the LEDs 6 of the LED sets 14B and 14C. The axis is brought closer to the optical axis side of the LED 6 of the LED set 14A, the second direction of the optical axis of the LED 6 of the LED set 14B is inclined about 30 degrees toward the predetermined direction with respect to the first direction, and the LED 6 of the LED set 14C is The third direction of the optical axis is inclined about 30 degrees to the side opposite to the predetermined direction with respect to the first direction. In such an LED lamp 2A, the illumination angle (light distribution angle) becomes as narrow as about 120 degrees, and the spread of illumination light from the LED lamp 2A can be suppressed.

  Also, in the LED lamp 2B shown in FIG. 5B, the plurality of LEDs 6 are composed of two sets of LEDs 14A and 14C, and the optical axis of the LED 6 of the LED set 14A is in a predetermined direction (right side in FIG. 5B). The optical axis of the LED 6 of the other LED set 14B extends in a second direction inclined about 50 degrees in the predetermined direction, and the illumination angle (light distribution angle) of the LED lamp 2B is extended to the first direction inclined about 10 degrees. ) Becomes as narrow as about 110 degrees, and its light distribution can be somewhat shifted to the predetermined side.

  Thus, the illumination direction and the illumination angle can be adjusted by changing the optical axes of the LEDs of the LED groups 14A, 14B, and 14B. 1 to 3, for example, the LED set 14C (or 14B) of the LED lamp 2 in the embodiment may be omitted, and the LED lamp 2 may be configured by the LED sets 14A and 14B (or 14A and 14C). .

  Next, another embodiment of the LED lamp will be described with reference to FIGS. 6 and 7. FIG. 6 is a cross-sectional view showing an LED lamp according to another embodiment, and FIG. 7 is a cross-sectional view taken along line BB in FIG.

  In the LED lamp 2C of this modification, a lamp main body 24 is constituted by the lamp substrate 20 and the transparent lamp cover 22, and the lamp main body 24 is attached to, for example, a lighting device main body (not shown). Also in this LED lamp 2C, an LED substrate 12 is mounted inside, a plurality of LEDs 6 are attached to the LED substrate 12, and a current control circuit 13 for lighting the LEDs 6 is attached.

  In this embodiment, four LEDs 6 are made into one set, and the one LED set 26 constitutes one row, and the row of the LEDs 6 is arranged in the longitudinal direction of the LED substrate 12 (the left-right direction in FIG. 6 and the paper surface in FIG. 7). A plurality are provided at intervals in the vertical direction). The LED set 26 may have the same configuration, for example, a combination of a green emission wavelength and a yellow emission wavelength, and may partially include other emission wavelengths. In this form, in each LED set 26, the optical axes of the pair of outer LEDs 6 extend in the first direction (the direction perpendicular to the mounting state of the LED lamp 2C), and the optical axes of the pair of inner LEDs 6 are the second. It extends in a direction (a direction inclined about 45 degrees outward with respect to the first direction).

  In the LED lamp 2C having such a configuration, since the four LEDs 6 are arranged in the width direction of the LED substrate 12, the irradiation light of the LED lamp 2C increases in the width direction, and illumination is wide in the width direction. be able to.

  In the above-described embodiments, examples have been described in which the lamp is used for a crime prevention light, a street light, or the like. However, when such an LED lamp is used as a light source lamp for plant growth, it is configured as follows. Is preferred. As described with reference to the absorption spectrum of plant chlorophyll shown in FIG. 9, the absorption spectrum has peaks at a blue wavelength of 430 to 460 nm and a red wavelength of 650 to 660, and these wavelengths are used for photosynthesis. It works effectively and greatly contributes to the photomorphogenesis of plants. Accordingly, the LED 6 has a light emission wavelength in the range of 400 to 490 nm, for example, a blue light emission wavelength of 470 nm (the wavelength indicated by symbol D in FIG. 9), and a light emission wavelength in the range of 610 to 680 nm, for example, a red light emission wavelength of 660 nm ( It is preferable to use one having a wavelength indicated by symbol C in FIG. The LEDs 6 of these emission wavelengths are, for example, as shown in FIGS. 1 and 2, as shown in FIGS. 4 (a) to 4 (d), or as shown in FIGS. 5 (a) and 5 (b). Furthermore, it can arrange | position as shown in FIG.6 and FIG.7. Such LED lamps can be used for electric lighting cultivation of plants, for example, electric lighting chrysanthemum cultivation, and it becomes possible to delay the shipping time by artificially shining light to prolong the sunshine time, The power consumption can be reduced as compared with the case of using an incandescent lamp or a fluorescent lamp.

  It should be noted that it is preferable to use an LED that emits light at a wavelength of 500 to 600 nm when illuminating the plant so that it does not affect the growth of the plant, for example, during night care or preparation for shipping. It is possible to adjust the shipment by performing these operations without adversely affecting the plant by lighting.

  For the cultivation of plants, a first LED having an emission wavelength (typically blue emission wavelength and / or red emission wavelength) that is effective for plant growth, and an emission wavelength that is not effective for plant growth (typically, A second LED having a green emission wavelength and / or a yellow emission wavelength may be used in combination. In this case, the first LED is turned on when adjusting the shipping time by performing the electric cultivation, and the second LED may be turned on when performing maintenance at night, preparation for shipping, and the like. By controlling lighting, it becomes possible to perform desired cultivation of plants.

  The LED lamp for plant cultivation is used as shown in FIG. 10, for example. For example, the LED lamp 2B (for example, FIG. 5B) in which the optical axis of the LED 6 is tilted to one side so as to collect light inside the growth box 32 so that the growth box 32 does not leak at both ends of the growth box 32. In addition, an LED lamp 2 having a spread on both sides (for example, the one shown in FIGS. 1 and 2) is used in the middle part of the growth box 32, and these LED lamps 2 and 2B are connected to each other. By using it, the growth efficiency of the plant seedling 32 can be increased.

  In the case of illuminating an external signboard, the wall surface 33, etc., an LED lamp is used as shown in FIG. In FIG. 11, in this case, it is effective to use the LED lamp 2B (for example, the one shown in FIG. 5 (6)) inclined only on one side with respect to the optical axis of the LED 6. In this case, since the light emission wavelength of the LED to be used is required to have a good color rendering property, a white LED is used. However, since a general white LED often has a bluish wavelength, a yellow LED is mixed. As a result, a warm emission color can be obtained. Incandescent spotlights are often used for signboards to illuminate a narrow area, but they are consumed for reasons such as high power consumption and high lamp replacement costs due to short lifespans. The advantage of replacing the LED with less power and longer lamp life is greater.

  Such an LED lamp 2 (2A, 2B) is used in place of an existing fluorescent lamp and is therefore lit through a ballast. An example of the lighting circuit is shown in FIG. explain. In FIG. 12, in the fluorescent lamp fixture 34, a ballast 38 is connected in series to a power source 36, and a lighting tube 40 is connected via a filament of the fluorescent lamp. In the straight tube type LED lamp 2 (2A, 2B), the lighting tube 40 is removed from the fluorescent lamp fixture 34, and the LED lamp 2 (2A, 2B) is attached instead of the fluorescent lamp lamp. In the LED lamp 2 (2A, 2B), a capacitor 42 is provided for current limitation, and the DC diode is changed to a DC power source by a bridge diode 44 and connected to the LED 6 connected in series via a resistor 46 for preventing inrush current. The LED lamp 2 (2A, 2B) can be directly connected to an AC power supply without using a ballast, but can be attached to an existing fluorescent lamp fixture instead of a fluorescent lamp. In the lighting circuit of the straight tube type LED lamp 2 (2A, 2B), the capacitor 42 has a phase advance type power factor. However, when used as a fluorescent lamp compatible, the ballast 38 operates as a slow phase. The rate is improved and the luminous efficiency is also improved. Since the circuit current of the LED lamp 2 (2A, 2B) is smaller than the circuit current of the fluorescent lamp, the loss due to the ballast 38 becomes a small value.

  Although the embodiments of the LED lamp according to the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and corrections can be made without departing from the scope of the present invention.

The front view which shows the LED lamp of one Embodiment. Sectional drawing by the AA in FIG. The figure which shows the light distribution curve of the LED lamp of FIG. The figure which shows simply the arrangement | positioning form of LED in an LED lamp. Sectional drawing which shows the example of arrangement | positioning of LED of an LED lamp. Sectional drawing which shows the LED lamp of other embodiment. Sectional drawing by the BB line in FIG. The figure which shows the specific visibility curve of a human eye. The figure which shows the absorption spectrum of the chlorophyll of a plant. The figure which shows the example which used the LED lamp for cultivation of a plant. The figure which shows the example which used the LED lamp for illumination of a wall surface. The circuit diagram which shows an example of the lighting circuit of an LED lamp.

Explanation of symbols

2,2A, 2B, 2C LED lamp 4,24 Lamp body 6 LED (light emitting diode)
12 LED board 14A, 14B, 14C, 26 LED set

Claims (6)

  In the LED lamp including a plurality of LEDs, the plurality of LEDs include a plurality of types having different emission wavelengths, and an optical axis of at least a part of the plurality of types of LEDs extends in a first direction. The LED lamp, wherein an optical axis of at least a part of the remaining portion of the LED extends in a second direction different from the first direction.   At least some of the optical axes of the remaining portions of the plurality of types of LEDs extend in a second direction different from the first direction, and the remaining optical axes of the remaining portions of the plurality of types of LEDs have the first and second directions. The LED lamp according to claim 1, wherein the LED lamp extends in a third direction different from the first direction.   In the LED lamp including a plurality of LEDs, the plurality of LEDs include a plurality of types having different emission wavelengths, and the plurality of types of LEDs have a green emission wavelength having high sensitivity of human eyes in a dark place. And an LED lamp having a yellow emission wavelength that complements the green emission wavelength.   In the LED lamp including a plurality of LEDs, the plurality of LEDs are configured to emit light having a wavelength of 500 to 600 nm that is not effective for plant photomorphogenesis, and at least some of the optical axes of the plurality of types of LEDs are The LED lamp is characterized in that it extends in one direction, and at least a part of the optical axes of the remaining portions of the plurality of types of LEDs extend in a second direction different from the first direction.   In the LED lamp including a plurality of LEDs, the plurality of LEDs are configured to emit light having a wavelength of 400 to 490 nm and / or 610 to 680 nm, which is effective for light morphogenesis of plants, and at least of the plurality of types of LEDs. A part of the optical axis extends in a first direction, and at least a part of the optical axis of the remaining part of the plurality of types of LEDs extends in a second direction different from the first direction. . In the LED lamp having a plurality of ELDs, the plurality of LEDs emit light having a wavelength of 500 to 600 nm which is not effective for plant photomorphogenesis, and those which are effective for plant photomorphogenesis and 400 to 490 nm and / or An LED lamp comprising: a light emitting element having a wavelength of 610 to 680 nm.

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