JP2011108583A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of adjusting color temperature or color rendering characteristics at the time of shipping from a factory or coping with a situation of an installation place. <P>SOLUTION: The light source device 10A includes: an LED 12; a cabinet 14 to house the LED 12 in its inside and having an emission opening 14a to emit light radiated from the LED 12; and an exchangeable cover 16 to cover the emission opening 14a of the cabinet 14. By forming, at the cover 16, a blue color wavelength light reducing region 24 to reduce blue color wavelength light in the light radiated from the LED 12, or warm color wavelength light reducing region 50 to reduce warm color wavelength light, the above problem can be solved. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a light source device using a light-emitting diode, which is used in general lighting and optical equipment such as homes, commercial facilities, and exhibition facilities.

  Light-emitting diodes (hereinafter referred to as “LEDs”), which have lower power consumption and calorific value than conventional incandescent bulbs and have a long service life, are one of the energy-saving measures along with increasing ecological awareness of consumers. As its use range is rapidly widening.

  However, since LEDs are manufactured through complicated and delicate manufacturing processes, the light emitted from each LED is likely to vary in light quantity and wavelength. The current situation is that the difference cannot be avoided, and LED manufacturers check the color temperature of light from each LED before shipment and sort the LEDs for each color temperature in order to align the color temperature.

  Apart from such “selection of LEDs”, a technique for controlling the emission color has been developed on the premise that there is an individual difference in the light of the LED. For example, Patent Document 1 shows in FIG. As described above, the LED element 1 and the covering member 2 that covers the LED element 1 are provided, and an unnecessary emission color component (wavelength) is weakened by the dyed layer 3 formed on the surface of the covering member 2. An LED 4 tuned to emit light of a desired color temperature is disclosed.

JP 2004-88003 A

  However, in the LED 4 disclosed in Patent Document 1, since the color temperature of light is adjusted by providing the dye layer 3 on the surface of the covering member 2, after the step of providing the dye layer 3, When an LED 4 that emits light that does not fall within a predetermined color temperature range is found in a pre-shipment inspection at a manufacturing factory of a light source device using the LED 4, or when it is desired to adjust the color temperature at the site where the light source device using the LED 4 is installed Even so, it was no longer possible to adjust the color temperature.

  In addition, recently, the “color rendering index” (average color rendering evaluation color (8 types) and special color rendering evaluation color (7 types), which is an index representing how faithfully the color of natural light (reference light) is reproduced. And the test light (a total of 15 colors) are used to quantify the magnitude of deviation between the sample light and the reference light (color close to natural light defined by JIS). In other words, the performance of the LED 4 is evaluated by the color rendering properties of the light emitted from the LED 4, and the color rendering property is adjusted. There is an increasing demand to do so.

  The present invention has been developed in view of such problems of the prior art and the demand for LEDs. Therefore, the main object of the present invention is to provide a light source device that can adjust the color temperature or color rendering property before shipment from the manufacturing factory of the light source device or according to the situation of the site where it is installed, and the color temperature or color rendering property. The object is to provide a light source device with adjusted characteristics.

According to the first aspect of the present invention, “the LED 12, the housing 14 that houses the LED 12 therein, and has the light emission opening 14a of the light emitted from the LED 12, and the light emission opening 14a of the housing 14 are provided. A light source device 10A including a replaceable cover 16 for covering,
The cover 16 has a blue wavelength light reduction region 24 for reducing blue wavelength light emitted from the LED 12 or a warm color wavelength light reduction region 50 for reducing warm color wavelength light. is there.

  According to the present invention, the color temperature of the light emitted from the light source device 10A is adjusted by reducing the blue wavelength light in the light emitted from the LED 12, or the light source device 10A is reduced by reducing the warm color wavelength light in the light. Since the color rendering properties of the light emitted from the light source are adjusted, by preparing several covers 16 with different blue wavelength light reduction rates in the blue wavelength light reduction region 24 (blue wavelength light reduction rate). The color temperature of the light after passing through the cover 16 is lower as the value of is larger.) Alternatively, by preparing several covers 16 having different warm color wavelength light reduction rates in the warm color wavelength light reduction region 50, The color of light emitted from the light source device 10A by replacing the cover 16 of the light source device 10A according to the situation of the site where the light source device 10A is installed. It is possible to adjust the degree or color rendering index (of course, in a factory of manufacturing the light source device 10A, the color temperature of the light exiting from the light source device 10A equalized, or can be adjusted color rendering).

  Throughout the present specification, “warm color light” means green light in addition to red light (wavelength: 780 to 610 nm), orange light (wavelength: 610 to 590 nm) and yellow light (wavelength: 590 to 570 nm). (Wavelength: 570 to 500 nm).

  Further, in this specification, “reduction of blue wavelength light” and “reduction of blue wavelength light” are assumed to adjust the color temperature of light by reducing blue wavelength light and to adjust the color rendering of light by reducing warm color light. Although the role of `` reducing warm wavelength light '' is described separately for convenience, the color rendering property of light can be adjusted by reducing blue wavelength light, and the color temperature of light can be adjusted by reducing warm color light. It is possible to "adjust the color rendering properties of light by reducing blue wavelength light and adjust the color temperature of light by reducing warm color wavelength light", which is naturally included in the technical scope of the present invention. .

According to the second aspect of the invention, “a plurality of LEDs 12, a housing 14 that accommodates the LEDs 12 therein, and has an exit opening 14 a for light emitted from the LEDs 12, and the exit opening of the housing 14. A light source device 10B-C comprising a cover 16 covering 14a,
The cover 16 includes a blue wavelength light reduction region 24 that reduces the blue wavelength light of the light emitted from the LED 12 or a warm color wavelength light reduction region 50 that reduces warm color light, and a transparent region 26 that transmits all visible light. And a light source device 10B to 10C ”that is rotatably mounted along the exit opening 14a.

The invention described in claim 3 is described as follows: “One LED 12, a housing 14 in which the LED 12 is housed and a light emitting opening 14 a emitted from the LED 12, and the light emitting opening of the housing 14. A light source device 10D including a cover 16 covering 14a,
The cover 16 includes a blue wavelength light reduction region 24 that reduces the blue wavelength light of the light emitted from the LED 12 or a warm color wavelength light reduction region 50 that reduces warm color light, and a transparent region 26 that transmits all visible light. And is attached rotatably along the exit opening 14a,
In the light source device 10D, the LED 12 is arranged such that a region A through which the light emitted from the LED 12 passes through the cover 16 is asymmetric about the rotation center of the cover 16. is there.

  According to the invention described in claim 2 and claim 3, by rotating the cover 16 that is rotatably mounted along the emission opening 14a of the housing 14, blue light out of the light transmitted through the cover 16 is rotated. The blue wavelength light or the warm color wavelength in the whole light emitted from the light source devices 10B to D is changed by changing the ratio of the light transmitted through the wavelength light reduction region 24 or the warm color light reduction region 50 and the ratio of the light passing through the transparent region 26. The degree of light reduction can be adjusted (when the degree of reduction of blue wavelength light or warm color light is adjusted in a “high” range, the blue wavelength light reduction region 24 or warm color light reduction region on the entire cover 16 is adjusted. When the cover 16 having a large area of 50 is used and, on the contrary, the adjustment is made in the “low” range, the blue wavelength light reduction region 24 or the warm temperature on the entire surface of the cover 16 is adjusted. The cover 16 having a small area of the wavelength light reduction region 50 is used.) As a result, a plurality of color temperature adjustments or color rendering properties adjustments in the field (of course, the light source device manufacturing factory may be used). Therefore, the color temperature or the color rendering can be adjusted more easily.

  In the case where there is one LED 12 (Claim 3), “LED 12 is arranged such that the region A that transmits light 16 emitted from the LED 12 through the cover 16 is asymmetric about the rotation center of the cover 16. If the region A is “symmetric” about the rotation center of the cover 16, the blue wavelength light reduction region 24 or the warm wavelength light reduction region 50 of the cover 16 is defined. And the transparent region 26 are divided into “the light transmitted through the blue wavelength light reduction region 24 or the warm wavelength light reduction region 50 out of the light transmitted through the cover 16 by rotating the cover 16. This is because the ratio of the light passing through the transparent region 26 cannot be changed ”(when there are a plurality of LEDs 12, there is no such restriction).

The invention described in claim 4 is described as follows: “LED 12, housing 14 that houses LED 12 therein, and has an output opening 14 a for light emitted from LED 12, and said output opening 14 a of said housing 14. A light source device 10B-C comprising a cover 16 for covering,
The cover 16 includes a blue wavelength light reduction region 24 that reduces the blue wavelength light of the light emitted from the LED 12 or a warm color wavelength light reduction region 50 that reduces warm color light, and a transparent region 26 that transmits all visible light. And
After passing through the cover 16 by adjusting the rate at which the light emitted from the LED 12 passes through the blue wavelength light reduction region 24 or the warm color light reduction region 50 and the rate through which the light passes through the transparent region 26. The light source devices 10B to 10C, whose color temperature or color rendering properties are adjusted.

  According to the light source device of the present invention, it is not a method that requires a dedicated device for adjusting the color temperature of light emitted from the LED by the dyed layer provided on the surface of the covering member, but covers the opening of the housing. Since the color temperature or color rendering can be changed simply by replacing or rotating the cover, unlike the LED of Patent Document 1, before shipping from the light source device manufacturing factory or in the situation of the site where the light source device is installed. In addition, the color temperature or color rendering can be adjusted easily. In addition, it is possible to provide a light source device in which the color temperature or the color rendering property is adjusted as described above.

It is a side view (partial sectional view) showing the light source device of the first embodiment of the present invention. It is the figure (front view) by the II-II arrow of FIG. It is a graph which shows the spectral intensity distribution radiated | emitted from LED, and the transmittance | permeability of each wavelength in a cover. It is a side view (partial cross section figure) which shows the light source device of 2nd Example of this invention. It is the figure (front view) by the VV arrow of FIG. It is a side view (partial sectional view) showing another example in the second example. It is a front view which shows the light source device of 3rd Example of this invention. It is a front view which shows the other Example in 3rd Example. It is a figure which shows the other Example in 3rd Example. It is a front view which shows the light source device of 4th Example of this invention. It is a figure which shows a prior art. It is a graph which shows the spectral intensity distribution radiated | emitted from LED, and the transmittance | permeability of each wavelength in a cover.

  Hereinafter, a light source device 10 to which the present invention is applied will be described with reference to the drawings. First, a light source device 10A that emits light of a desired color temperature by exchanging a cover will be described as a first embodiment, and then a blue wavelength light reduction region and a full wavelength light transmission region will be described as a second embodiment. A light source device 10B having four LEDs that adjusts the color temperature of the emitted light by rotating the cover configured as described above will be described. Further, as a variation of the light source device 10B of the second embodiment, a light source device 10C (third embodiment) having two LEDs and a light source device 10D (fourth embodiment) having one LED will be described. In addition, about the part which is common in light source device 10A-10C which concerns on the Example demonstrated previously, the said description is used and the description is abbreviate | omitted.

(First embodiment)
As shown in FIGS. 1 and 2, the light source device 10 </ b> A according to the first embodiment includes an LED (light emitting diode) 12, a housing 14, a cover 16, a holder 18, and a power supply terminal 20. Yes.

  The LED 12 is a light source body that emits light when a predetermined voltage is applied, and is disposed at the bottom 14 b of the housing 14 toward the emission opening 14 a. In this embodiment, one LED 12 is used, but the number of LEDs 12 is not limited to this, and a plurality of LEDs 12 can be used. Further, the LED 12 can be disposed toward the inner surface of the housing 14 (in this case, it is necessary to provide a reflective surface inside the housing 14).

  The housing 14 is a bowl-shaped member that houses the LED 12 inside and has an emission opening 14a for light emitted from the LED 12 (of course, has a space for accommodating the LED 12, such as a bowl, and an emission opening 14a. As long as the shape is not limited to a bowl shape, the LED 12 is disposed on the bottom portion 14b facing the emission opening 14a as described above. As a material of the housing 14, for example, glass or aluminum is used. Further, when the LED 12 is disposed toward the emission opening 14a as in the present embodiment, it is not essential, but the inner surface of the housing 14 forms the optical axis L of the light emitted from the LED 12. A light reflecting surface 22 that reflects light having a large angle (light larger than the angle θ in FIG. 1) is formed. Such a light reflection surface 22 is formed by metal vapor deposition, for example, when the material of the housing 14 is aluminum.

  The cover 16 is a disk-shaped member made of a material that transmits light, such as glass, acrylic, or polycarbonate, and is fitted into the emission opening 14 a so as to cover the emission opening 14 a of the housing 14. The cover 16 is held by a metal band 25 that is wound around the end of the housing 14 on the side of the emission opening 14a. Further, a blue wavelength light reduction region 24 for reducing the blue wavelength light in the light emitted from the LED 12 is formed on the entire surface 16a of the cover 16 (the light black portion in FIG. 2 represents the blue wavelength light reduction region 24). Of course, the blue wavelength light reduction region 24 may be formed on only a portion of the surface 16a.) The blue wavelength light reduction region 24 is formed by depositing a multilayer film that reduces blue wavelength light on the surface 16 a of the cover 16, and a transparent body or a transparent body that reduces blue wavelength light is used as the cover 16. Other methods, such as using, can also be used.

  The holder 18 is a substantially multistage cylindrical member formed of a heat-resistant insulating material such as ceramic, and the housing 14 (and the LED 12) is attached to one end (right end in the figure) by means such as adhesion. In addition, a power supply terminal 20 is attached to the other end (left end in the figure), and a lead wire (not shown) for electrically connecting the power supply terminal 20 and the LED 12 is provided on the inner side. A lead wire insertion hole (not shown) is provided for the insertion of.

  The power supply terminal 20 is a pair of pin-shaped conductors that are attached to the other end of the holder 18 as described above and receive electric power from the outside.

  The shapes of the holder 18 and the power supply terminal 20 are not limited to those of the present embodiment, and other shapes may be employed according to the shape of a socket (not shown) to which the light source device 10A is attached.

  Next, a method for adjusting the color temperature of the light emitted from the LED 12 using the blue wavelength light reduction region 24 will be described. As shown in FIG. 3, the spectral characteristic S of a typical LED 12 generally called “warm white” has a relatively narrow peak P1 centered on blue light (wavelength: 430 to 460 nm) and orange light (wavelength). : 590 to 610 nm) and a relatively wide peak P2, of which the individual LEDs 12 vary in height (= intensity) of the peak P1 centered on blue light. The color temperature of light emitted from the LED 12 varies in the range of 2600 to 3375K (of course, the range of this variation varies depending on the LED type and the manufacturer).

  FIG. 3 shows spectral characteristics S of three sample LEDs (1) to (3) having different color temperatures of emitted light, and the light color of the sample LED (1) having the lowest peak P1 height. The color temperature of the light of the sample LED (2) having the lowest peak P1 height is 2980K, and the color temperature of the light of the sample LED (3) having the highest peak P1 height is 3250K. Met.

  In this way, the light from the sample LEDs (1) to (3) having different color temperatures is converted into three types of covers having different blue wavelength light reduction rates (in other words, transmittance T) in the blue wavelength light reduction region 24. It adjusts by reducing the height of peak P1 using 16 (1)-(3). The upper part of FIG. 3 shows the transmittance (%) T of the covers 16 (1) to (3) for each wavelength light contained in the light from the sample LEDs (1) to (3), The transmittance of the blue wavelength light corresponding to the peak P1 is highest in the cover 16 (1) used for the sample LED (1), and the cover 16 (2) used for the sample LED (2) and the sample LED (3) The transmittance decreases in the order of the cover 16 (3) used.

  Such a difference in transmittance of blue wavelength light is determined by the thickness of the multilayer film deposited on the surface 16a of the cover 16 to reduce blue wavelength light. That is, when the transmittance is increased, the thickness of the multilayer film is set to be thin (or zero), and when the transmittance is decreased, the thickness of the multilayer film is set to be thick.

  By applying the covers 16 (1) to (3) having appropriate blue wavelength light transmittance to the sample LEDs (1) to (3) having different color temperatures, respectively, the sample LED (1) and the cover 16 (1 The color temperature of light emitted from the light source device 10A (1) using 2) is 2780K (no change), and the light emitted from the light source device 10A (2) using the sample LED (2) and the cover 16 (2) is used. The color temperature of the light emitted from the light source device 10A (3) using the sample LED (3) and the cover 16 (3) is 2800K, and the color temperature can be adjusted to about 2800K. it can.

  Further, instead of the blue wavelength light reduction region 24, a warm color wavelength light reduction region 50 for reducing the warm color wavelength light in the light emitted from the LED 12 may be formed on the entire surface 16a of the cover 16 or a part thereof.

  A method for adjusting the color rendering property of the light emitted from the LED 12 using the warm color wavelength light reduction region 50 will be described. For example, the average color rendering index Ra of light emitted from the sample LED (4) having the spectral characteristic S as shown in FIG. 12 is “Ra = 83”. For such light, by using the cover 16 (4) having the warm-color-wavelength light reduction region 50, the height of the peak P2 (peak centered on orange light having a wavelength of 610 nm) is reduced, thereby reducing the color rendering. As a result of the adjustment (the upper part of FIG. 12 shows the transmittance (%) T of the cover 16 (4) for each wavelength light included in the light from the sample LED (4)), the cover 16 (4 ), The average color rendering index Ra of the light after passing through was improved to “Ra = 90”.

  As described above, according to the light source device 10 </ b> A of the first embodiment, the blue wavelength light reduction rate (in other words, the transmittance) in the blue wavelength light reduction region 24, or the warm color wavelength light in the warm color light reduction region 50. By preparing several covers 16 having different reduction ratios, the light emitted from the light source device 10A according to the situation of the site where the light source device 10A is installed (or in the manufacturing factory of the light source device 10A) In order to make the color temperature uniform or to adjust the color rendering of light, the cover 16 of the light source device 10A can be replaced to emit light having a desired color temperature or color rendering.

(Second embodiment)
As shown in FIGS. 4 and 5, the light source device 10 </ b> B according to the second embodiment includes an LED 12, a housing 14, a cover 16, a holder 18, and a power supply terminal 20. Although it is the same as that of 10 A of light source apparatuses which concern on 1st Example, the four LED12 is used and the blue wavelength light reduction area | region 24 and the transparent area | region 26 are formed in the surface 16a of the cover 16. FIG. This is different from the light source device 10A. Hereinafter, these differences will be described, and the description in the first embodiment will be cited for the other.

  In the present embodiment, the four LEDs 12 are centered at the exit opening 14a side end portion of the square columnar LED holding member 28 extending on the central axis CL of the housing 14 from the bottom 14b of the housing 14 toward the exit opening 14a. They are arranged at equal distances from each other about the axis CL toward the inner surface of the housing 14 (therefore, in this embodiment, the light reflecting surface 22 may be formed on the inner surface of the housing 14). Essentially, most of the light emitted from each LED 12 is reflected by the light reflecting surface 22 facing each LED 12, and then passes through the cover 16 and exits to the outside.

  As described above, the blue wavelength light reduction region 24 and the transparent region 26 are formed on the surface 16a of the cover 16, and in this embodiment, the surface 16a is divided into eight equal parts in the circumferential direction as shown in FIG. Thus, eight regions are formed, and these regions are alternately used as a blue wavelength light reduction region 24 and a transparent region 26 (the light black portion in FIG. 5 is the blue wavelength light reduction region 24). Further, the cover 16 is rotatably held around the central axis CL of the casing 14 by a metal band 25 wound around the end of the casing 14 on the side of the emission opening 14a (the cover 16 is rotated about the emission opening 14a). Can be set so that the rotation center of the cover 16 and the center axis CL of the housing 14 are shifted from each other.

  A method for adjusting the color temperature of the light emitted from the light source device 10B of the second embodiment will be described. After being emitted from the LED 12, most of the light reflected by the light reflecting surface 22 is transmitted through a region facing the reflection position in the cover 16 (region A in FIGS. 5A to 5C). For this reason, as shown in FIG. 5A, when the transparent region 26 of the cover 16 overlaps the region A, most of the light emitted from the four LEDs 12 passes through the transparent region 26. The blue wavelength light is hardly reduced, and the color temperature of the light emitted from the light source device 10B hardly changes. Since the light emitted from the four LEDs 12 also has a difference in color temperature, it is reflected by the light reflecting surface 22 as in the case where a rotating paraboloid is used for the light reflecting surface 22 of the housing 14. When the obtained light becomes parallel light with respect to the central axis CL of the housing 14, four irradiation regions having different color temperatures are generated on the irradiation surface. Further, when the light reflected by the light reflecting surface 22 is condensed at a predetermined condensing point as in the case where a spheroid is used as the light reflecting surface 22, four kinds of colors are used in the vicinity of the condensing point. Light having a temperature is mixed and becomes an average color temperature light.

  When the cover 16 is rotated with respect to the housing 14 and the LED 12 from such a state, the blue wavelength light reduction region 24 begins to overlap the region A (see FIG. 5B), and the light emitted from the four LEDs 12 Among them, the ratio of the light with which the blue wavelength light is reduced increases, and the color temperature of the light emitted from the light source device 10B becomes lower by the amount that the blue wavelength light is reduced.

  When the cover 16 is further rotated, the blue wavelength light reduction region 24 that overlaps the region A is maximized (see FIG. 5C), and the proportion of light in which blue wavelength light is reduced among the light emitted from the LED 12 at this time. Becomes the maximum, and the color temperature of the light emitted from the light source device 10B becomes the minimum.

  When the reduction ratio of the blue wavelength light is increased, not only the color temperature of the entire light emitted from the light source device 10B is lowered as described above, but also the light emitted from the four LEDs 12 having variations between each other. The difference in color temperature is also decreasing. This is because the ratio of the light having a high color temperature (= high intensity of blue wavelength light) transmitted through the blue wavelength light reduction region 24 and the light having a low color temperature (= low intensity of blue wavelength light) is blue. If the ratio of the light transmitted through the wavelength light reduction region 24 is the same, the amount of blue wavelength light absorbed when the former is transmitted through the cover 16 is larger than that of the latter. In other words, even if the blue wavelength light reduction region 24 is transmitted by the same ratio, the former can be said to have a greater degree of decrease in color temperature. Thereby, when a rotating paraboloid is used for the light reflecting surface 22, the color temperatures of the four irradiation regions generated on the irradiation surface are lowered and uniformized. Further, when the spheroid is used, the color temperature of the averaged light is lowered.

  Also in the light source device 10B of the second embodiment, similarly to the light source device 10A of the first embodiment, instead of the blue wavelength light reduction region 24, the warm color wavelength that reduces the warm color wavelength light in the light emitted from the LED 12 is reduced. The light reduction region 50 may be formed on the surface 16 a of the cover 16.

  When the warm color light reduction region 50 is formed instead of the blue wavelength light reduction region 24, the color rendering property of the light emitted from the light source device 10B can be adjusted by adjusting the ratio of the light in which the warm color light is reduced. Since the adjustment method is basically the same as “when adjusting the color temperature of light”, the above description is incorporated and the description is omitted.

  As described above, according to the light source device 10B of the second embodiment, the light source device 10B is rotated by rotating the cover 16 configured by the blue wavelength light reduction region 24 or the warm color light reduction region 50 and the transparent region 26. Since it is possible to adjust the degree of reduction of blue wavelength light or the degree of reduction of warm color wavelength light in the entire light emitted from the light, it is necessary to prepare a plurality of covers 16 for adjusting the color temperature or color rendering in the field. The color temperature or color rendering can be adjusted more easily. Of course, the color temperature or color rendering can be adjusted in the pre-shipment inspection at the manufacturing factory of the light source device 10B, and the cover 16 can be fixed to the exit opening 14a of the housing 14 with an adhesive or the like before shipment.

  In place of the LED 12 in this embodiment, as shown in FIG. 6, a lens holding member 34 that holds the LED element 30, the lens 32, and the lens 32 at predetermined positions (in FIG. 6, the lens holding member 34 is a transparent body). However, the lens holding member 34 may be a translucent material or an opaque material such as a metal).

  The lens 32 is used to form a virtual image I of the LED element 30 on the back side of the LED element 30, and the center of the virtual image I of the LED element 30 in each light emitting body 36 is the light reflecting surface 22 of the housing 14. Each light emitter 36 is arranged so as to coincide with the focal point F of the paraboloid of revolution or the ellipsoid of rotation.

  As a result, in spite of the use of the four light emitters 36, parallel light as if light is emitted from one light source disposed around the focal point F (the light reflecting surface 22 is rotated and released). It is possible to obtain the light source device 10B that can emit light (when it is an object surface) or condensed (when the light reflecting surface 22 is a spheroid).

(Third embodiment)
The light source device 10C according to the third embodiment is different from the light source device 10B according to the second embodiment in that the number of LEDs 12 used is two as shown in FIGS.

  FIG. 7 shows a case where the two LEDs 12 are arranged toward the light reflecting surface 22 of the housing 14 while being back to back. When the two LEDs 12 are arranged in this way, the cover 16 is divided into the blue wavelength light reducing region 24 and the transparent region 26 by dividing the cover 16 into four equal parts in the circumferential direction to form four regions. In addition to a method (see FIG. 7A) in which the regions are alternately set to the blue wavelength light reduction region 24 and the transparent region 26, the blue wavelength light reduction region 24 or the transparent region 26 overlapping the region A by rotating the cover 16 is used. For example, as shown in FIG. 7B, the blue wavelength light reduction region 24 may be formed in a rectangular shape as long as the ratio can be changed. Although not shown, two light emitters 36 may be used instead of the LED 12 as described above.

  Further, FIG. 8 shows a case where two LEDs 12 are arranged on the bottom portion 14b toward the emission opening 14a of the casing 14, and the two LEDs 12 are arranged with the central axis CL of the casing 14 in between (FIG. 8). 8 (a)), and the case where the LEDs 12 are arranged in the 3 o'clock direction and 6 o'clock direction in the figure centering on the central axis CL (see FIG. 8 (b)). In this case, if the LED 12 is disposed as shown in FIG. 8A as a division between the blue wavelength light reduction region 24 and the transparent region 26 in the cover 16, the cover 16 is surrounded by the same manner as in FIG. A method can be considered in which four regions are formed by dividing the region into four equal parts, and these regions are alternately used as a blue wavelength light reduction region 24 and a transparent region 26. With the arrangement of the LEDs 12 as shown in FIG. If so, a method may be considered in which one region obtained by dividing the cover 16 in half by a line passing through the center thereof is the blue wavelength light reduction region 24 and the other region is the transparent region 26. In any case, by rotating the cover 16, the area A (a circle of a predetermined size centered on the LED 12 if the LED 12 is arranged toward the exit opening 14 a of the housing 14 as in this embodiment). The inside may be a shape that can change the ratio of the blue wavelength light reduction region 24 or the transparent region 26 that overlaps the region A where the light emitted from the LED 12 passes through the cover 16.

  Also in the light source device 10C of the third embodiment, similarly to the first embodiment and the second embodiment, instead of the blue wavelength light reduction region 24, the warm color that reduces the warm color wavelength light in the light emitted from the LED 12 is reduced. The color rendering property of the light emitted from the light source device 10C can be adjusted by forming the wavelength light reduction region 50 on the surface 16a of the cover 16 and adjusting the ratio of the light in which the warm color light is reduced. Is basically the same as “when adjusting the color temperature of light”, and the description thereof is omitted here with the aid of the above description.

  Also in the light source device 10C according to the third embodiment, the light emitted from the light source device 10C is rotated by rotating the cover 16 formed of the blue wavelength light reduction region 24 or the warm color light reduction region 50 and the transparent region 26. Since the degree of reduction of blue wavelength light or the degree of reduction of warm color wavelength light can be adjusted as a whole, a plurality of covers 16 are used for adjusting color temperature or color rendering in the field (or the manufacturing factory of the light source device 10C). Therefore, the color temperature or color rendering can be adjusted more easily.

  In addition, as shown in FIG. 9A, a solid transparent shell-type lens 38 formed of polycarbonate or the like may be combined with the LED 12 in the embodiment shown in FIG.

  As shown in FIG. 9B, the bullet-type lens 38 is received from the light-receiving surface 38a (the left end surface in the figure) that receives the light emitted from the LED 12 inside the bullet-type lens 38 and the light-receiving surface 38a. A reflection surface 38b that reflects light on the inner surface and a light output surface 38c that faces the light receiving surface 38a and outputs light reflected by the reflection surface 38b. The light receiving surface 38a is formed with a recess 38d capable of accommodating the tip of the LED 12, and the distance from the light receiving surface 38a to the light exit surface 38c is determined by fitting the tip of the LED 12 into the recess 38d. Sometimes, the light exit surface 38c is in close contact with the cover 16 (the state shown in FIG. 9A), or is set so as to be shorter (when set so as to be shorter, A member for supporting the cannonball lens 38 is required separately).

  By using such a bullet-type lens 38, most of the light emitted from the LED 12 passes through the bullet-type lens 38, is reflected by the reflecting surface 38b, and is emitted from the light exit surface 38c as if it is emitted from the surface light source. Thus, the light can be emitted with a predetermined opening angle. Therefore, regardless of the opening angle that the LED 12 originally has (when the opening angle increases, the region A in FIGS. 8A and 8B increases), the region A (the bullet-type lens 38). The same as the light exit surface 38c).

(Fourth embodiment)
As shown in FIG. 10, the light source device 10D according to the fourth embodiment is different from the light source device 10C according to the third embodiment in that the number of used LEDs 12 is one.

  FIG. 10A shows a case where one LED 12 is arranged toward the light reflecting surface 22 of the housing 14. In this case, as the division of the blue wavelength light reduction region 24 and the transparent region 26 in the cover 16, one region obtained by dividing the cover 16 in half by a line passing through the center thereof is defined as the blue wavelength light reduction region 24, and the other region. Is a transparent region 26. Although not shown, in this case as well, the light emitter 36 can be used instead of the LED 12.

  FIG. 10B shows a case where one LED 12 is arranged on the bottom portion 14 b toward the emission opening 14 a of the housing 14. In this case, the LED 12 is disposed not at the center axis CL of the housing 14 but at a position shifted from the center axis CL as shown in the figure, and the region A in which the light emitted from the LED 12 passes through the cover 16. However, it is necessary to be “asymmetric” around the central axis CL of the housing 14 (that is, the region A that transmits the light emitted from the LED 12 through the cover 16 is “asymmetric” around the rotation center of the cover 16. It is necessary to arrange so that.

  When the LED 12 is arranged on the central axis CL of the casing 14 when the LED 12 is arranged on the bottom 14b toward the emission opening 14a of the casing 14, the region A in which the light emitted from the LED 12 passes through the cover 16 becomes the casing A. 14 is centered on the center axis CL (that is, the rotation center of the cover 16), and no matter how the blue wavelength light reduction region 24 and the transparent region 26 of the cover 16 are configured, “the cover 16 is rotated. This is because the ratio of the blue wavelength light reduction region 24 or the transparent region 26 overlapping the region A cannot be changed.

  Also in the case shown in FIG. 10B, as a division between the blue wavelength light reduction region 24 and the transparent region 26 in the cover 16, one region obtained by dividing the cover 16 in half by a line passing through the center thereof is blue wavelength light. A method can be considered in which the reduction area 24 is used and the other area is the transparent area 26. Note that the above-described bullet-type lens 38 may be combined with the LED 12.

  Further, in the light source device 10D of the fourth embodiment, instead of the blue wavelength light reduction region 24, a warm color wavelength light reduction region 50 that reduces the warm color wavelength light in the light emitted from the LED 12 is formed on the surface 16a of the cover 16. The color rendering property of the light emitted from the light source device 10D can be adjusted by adjusting the ratio of the light with which the warm color wavelength light is reduced. The adjustment method is basically “when adjusting the color temperature of light”. Therefore, the above description is incorporated and the description is omitted.

  Also in the light source device 10D according to the fourth embodiment, the light emitted from the light source device 10D is rotated by rotating the cover 16 constituted by the blue wavelength light reduction region 24 or the warm color light reduction region 50 and the transparent region 26. Since the degree of reduction of blue wavelength light or the degree of reduction of warm color wavelength light can be adjusted as a whole, a plurality of covers 16 are used for adjusting color temperature or color rendering in the field (or the manufacturing factory of the light source device 10D). Therefore, the color temperature or color rendering can be adjusted more easily.

10 ... Light source device 12 ... LED
DESCRIPTION OF SYMBOLS 14 ... Housing | casing 16 ... Cover 18 ... Holder 20 ... Power supply terminal 22 ... Light reflection surface 24 ... Blue wavelength light reduction area | region 25 ... Metal band 26 ... Transparent area 28 ... LED holding member 30 ... LED element 32 ... Lens 34 ... Lens holding Member 36 ... Luminescent body 38 ... Cannonball type lens 50 ... Warm color wavelength light reduction region

Claims (4)

A light source device comprising: an LED; a housing that houses the LED inside; a housing having an exit opening for light emitted from the LED; and a replaceable cover that covers the exit opening of the housing;
The light source device according to claim 1, wherein the cover has a blue wavelength light reduction region for reducing blue wavelength light of light emitted from the LED or a warm color wavelength light reduction region for reducing warm color light. A light source device comprising a plurality of LEDs, a housing that houses the LEDs inside thereof, an output opening for light emitted from the LEDs, and a cover that covers the output opening of the housing,
The cover includes a blue wavelength light reduction region that reduces blue wavelength light of light emitted from the LED or a warm color wavelength light reduction region that reduces warm color light, and a transparent region that transmits all visible light. And a light source device that is rotatably mounted along the exit opening. A light source device comprising: one LED; a housing that houses the LED inside; a housing having an exit opening for light emitted from the LED; and a cover that covers the exit opening of the housing;
The cover includes a blue wavelength light reduction region that reduces blue wavelength light of light emitted from the LED or a warm color wavelength light reduction region that reduces warm color light, and a transparent region that transmits all visible light. And is attached rotatably along the exit opening,
The LED is arranged such that a region through which the light emitted from the LED passes through the cover is asymmetric with respect to the rotation center of the cover. A light source device comprising: an LED; a housing that houses the LED inside; a housing having an exit opening for light emitted from the LED; and a cover that covers the exit opening of the housing;
The cover includes a blue wavelength light reduction region that reduces blue wavelength light of light emitted from the LED or a warm color wavelength light reduction region that reduces warm color light, and a transparent region that transmits all visible light. And
The color of the light after passing through the cover by adjusting the ratio of the light emitted from the LED to pass through the blue wavelength light reduction region or the warm wavelength light reduction region and the rate through the transparent region Light source device with adjusted temperature or color rendering.