JP2014049676A - Led light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED light-emitting device in which reproducibility of red, that is a significant defect of white LED illumination, is improved at an extremely low cost, without restricting the number of LEDs used or brightness thereof, the size or the product value of the LED light-emitting device, and the like.SOLUTION: In an LED light-emitting device including a substrate 6 mounting a plurality of white LEDs 3, a housing 2 for housing the substrate, and a diffuser plate provided to cover the aperture of the housing, any one or both of a resist 7 applied to the substrate, and the paint color 8 of the inner surface of the housing is red.

Description

  The present invention relates to an LED light emitting device using a light emitting diode (LED), and more particularly to an LED light emitting device with improved reproducibility of red light.

  LED (Light Emitting Diode) is a light source with excellent characteristics such as long life, high luminance, power saving, and instant lighting, and is used for display lamps and traffic lights of home appliances, liquid crystal backlights of mobile phones and digital cameras, etc. However, in recent years, a combination of the increase in the amount of light per unit power of white LEDs and the reduction in cost due to mass production has led to a rapid spread of lighting fixtures. When using an LED as a lighting fixture, it is necessary to arrange a large number of LEDs that are point light sources. In this case, shadows are projected for the number of installed LEDs, so that the LED is milky white diffused. It has been devised to cover with a plate to eliminate graininess and achieve surface emission.

  A conventional white LED device used as LED lighting emits white light by passing blue light from a blue LED through a yellow phosphor, but the red color reproducibility is particularly bad, for example red meat is yellowish For example, a blue LED that emits blue light and a yellow phosphor-containing member that covers the light emitting portion of the blue LED are provided, and red light is emitted in the vicinity of the blue LED. An LED light-emitting device including a red LED has been proposed (see, for example, Patent Document 1).

JP 2006-80334 A

  However, in Patent Document 1, since a dedicated red LED is used in addition to the white LED, an increase in cost is inevitable, and if the number of LEDs installed is limited, the amount of red LEDs installed is limited. Since the number of white LEDs to be installed is reduced, the illuminating device becomes dark, and conversely, if an attempt is made to maintain a constant brightness, the illuminating device becomes large.

  In addition, the red color reproducibility in a bite is not limited to the redness of the meat illustrated above, but various unique reds such as fish shellfish such as sushi, red vegetables, human oral cavity and various internal organs. Yes, even in Patent Document 1 that uses red LEDs together, it is not excellent in color rendering, such that all red colors can be reproduced with one type of red LED, but a red LED that emits subtle red light suitable for the purpose of use is required. Therefore, the cost is further increased. In addition, in LED light emitting devices using a diffusion plate, there is a method of arranging red on the diffusion plate itself, but in this case, there is a drawback that it becomes darker than a normal diffusion plate without red, and when the light is turned off Since the diffusion plate looks red, it is not suitable as an LED light-emitting device.

  The present invention has been made in the background of such circumstances, and the object of the present invention is to realize red reproducibility improvement, which is a major drawback of white LED illumination, at an extremely low cost, and further to use LEDs. An object of the present invention is to provide an LED light emitting device excellent in color rendering without restricting the number, brightness, size, commercial value, etc. of the LED light emitting device.

  In order to achieve the above-described object, the present invention provides an LED light emitting device including a substrate on which a plurality of white LEDs are mounted, a housing that accommodates the substrate, and a diffusion plate that is provided to cover an opening of the housing. One or both of the resist applied to the substrate and the coating color of the inner surface of the housing is red.

  As another means of the present invention, in an LED light emitting device including a substrate on which a plurality of white LEDs are mounted, a housing that houses the substrate, and a diffusion plate that is provided to cover an opening of the housing, Either or both of the resist to be applied and the coating color of the inner surface of the housing may be red, and in addition to this red, green and / or blue may be applied. When applying green and / or blue in addition to red, it is more preferable that the red area is larger than the green or blue area. Furthermore, the diffusion plate provided in the opening of the housing is preferably white, milky white, or translucent.

  The present invention uses a resist applied to the substrate and a coating color applied to the inner surface of the housing, and at least red is included in the coating color of the resist and the inner surface of the housing. For red, for example, fish and shellfish such as meat and sushi, red vegetables, human oral cavity, various internal organs, and the like, colors that match the purpose are selected so that each of them looks natural red. Part of the white light emitted from the plurality of white LEDs is reflected by the diffuser plate inside the housing, hits the red color of the resist and the inner surface of the housing, and is reflected as red light toward the diffuser plate. Part of the red light strikes the diffuser plate and is further reflected toward the inside of the housing, and the remaining light passes through the diffuser plate and becomes illumination light together with white light that has also passed through the diffuser plate. As described above, the illumination light from the LED light emitting device includes the red color of the resist and the inner surface of the housing, and reproduces a red color similar to that seen under sunlight.

  The present invention is based on coating the resist on the substrate and the inner surface of the housing with red, which has the worst color reproducibility, but by separately coating the green and blue constituting the three primary colors of light with red, In addition to color reproducibility, other color reproducibility is also improved. In this case, the red application area with the least reproducibility is set larger than green or blue, and the green or blue application area is determined according to the purpose of which color reproducibility is improved. In addition to red, when green or blue is applied to the resist of the substrate or the inner surface of the housing, illumination light closer to sunlight can be obtained. The red, green, and blue paint color shapes include a band shape, a rectangular shape, and a honeycomb shape, and the area ratio thereof is appropriately determined according to the required color reproducibility. Further, the diffuser plate in the housing opening is made white, milky white or translucent so that the diffuser masks the inside of the housing to the minimum necessary.

  The LED light emitting device of the present invention uses a resist applied to the substrate and a coating color applied to the inner surface of the housing, and paints at least red on the inner surface of the resist and the housing, so that only the white LED is used as the light source. However, it is possible to reproduce the subtle shade of red, which has been difficult to reproduce in the past, at a very low cost and with a handle. Furthermore, it is not necessary to restrict the number and brightness of the LEDs used, the size and the commercial value of the LED light emitting device, and the LED light emitting device having excellent color rendering properties can be obtained. Further, by separately applying red and green, which are the three primary colors of light, green and blue, it is possible to reproduce other color reproducibility as well as green and blue color reproducibility at a very low cost.

  Furthermore, by making the diffuser plate installed in the opening of the housing white, milky white, or semi-transparent, it is possible to prevent white LEDs from appearing glaring or appearing as a shabby shadow at the time of lighting. Occasionally, the color applied to the resist on the substrate or the inner surface of the housing is not seen through the diffusion plate. Thereby, the commercial value as an LED light-emitting device can be maintained well.

It is a bottom view of the illuminating lamp part of the magnifier stand with an illuminating lamp which shows the 1st form example of this invention. It is a cross-sectional front view of the illuminating lamp part of the magnifier stand with an illuminating lamp which shows the 1st form example of this invention. It is a bottom view of the illuminating lamp part of the magnifier stand with an illuminating lamp which shows the 2nd form example of this invention. It is a bottom view of the illuminating lamp part of the magnifier stand with an illuminating lamp which shows the 3rd form example of this invention. It is a cross-sectional front view of the illuminating lamp part of the magnifier stand with an illuminating lamp which shows the 3rd form example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention. The LED light-emitting device of the present invention is a magnifier stand with an illumination lamp.

  The magnifying glass stand 1 with an illuminating lamp shown in FIGS. 1 and 2 shows an illuminating lamp portion provided at the tip of a movable arm (both not shown) supported by a gantry. The white LED 3 is disposed, the lower surface opening of the housing 2 is covered with the diffusion plate 4, and a magnifying lens (not shown) is accommodated in the inner circular space 5 surrounded by the housing 2.

  The same number of white LEDs 3 as light sources are respectively mounted on five substrates 6 arranged in an arc shape in the housing 2, and a resist 7 applied to the lower surface of each substrate 6 excluding these white LEDs 3. Is made red, and the inner surface of the housing 2 is coated with the same red paint 8 as the resist 7. The resist 7 and the coating 8 on the inner surface of the housing 2 are used for a work observed through a magnifying lens (not shown), for example, when a magnifying glass stand with an illumination lamp is used for medical purposes and the work is in a human oral cavity. In addition, a red color is set so that the oral cavity can be seen with a natural reddish color similar to sunlight.

  The diffusion plate 4 installed in the opening of the housing 2 is formed in white, milky white or translucent, and is masked so that the inside of the housing 2 cannot be directly seen. Such reflection processing is applied, and a part of the light is reflected while appropriately transmitting the light in the housing 2.

  A part of the white light emitted from the many white LEDs 3 is transmitted through the diffusion plate 4, and the rest is reflected inside the housing 2 by reflection processing of the diffusion plate 4, and the resist 7 on the substrate 6 and the coating 8 on the inner surface of the housing 2. Is reflected as red light toward the diffusion plate. A part of the red light hits the diffuser plate 4 and is further reflected in the inner direction of the housing 2, and the rest is transmitted through the diffuser plate 4, and becomes illumination light together with the white light transmitted through the diffuser plate 4. In this way, the illumination light from the magnifying glass stand 1 with the illumination lamp includes the red color of the resist 7 and the paint 8 on the inner surface of the housing 2, and reproduces a natural red color as seen under sunlight. . In addition, by forming the diffuser plate 4 in the opening of the housing 2 to be white, milky white, or translucent, it is possible to prevent the white LED 3 at the time of lighting from appearing as glaring or appearing as a shabby shadow as much as possible. When the light is turned off, the red color of the resist 7 on the substrate 6 and the paint 8 on the inner surface of the housing is not seen through the diffusion plate 4.

  Next, second and third embodiments of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected about the same component as the said 1st example, and detailed description is abbreviate | omitted. FIG. 3 shows a second embodiment of the present invention. A magnifier stand 20 with an illumination lamp according to this embodiment is provided with a strip-shaped red resist on five arc-shaped substrates 6 on which a large number of white LEDs 3 are mounted. This embodiment is different from the first embodiment in that the 21a and the blue resist 21b are alternately arranged. In this embodiment, the reproducibility of both red light and blue light is improved.

  4 and 5 show a third embodiment of the present invention. The magnifier stand 30 with an illumination lamp according to the present embodiment is provided on five substrates 31 that are divided and arranged in an arc shape in the annular housing 2. In each case, two high-power white LEDs 32 are mounted. A red resist 33 is applied to the lower surface of each substrate 31 except for the power white LEDs 32, 32, and the same red coating 34 as the resist 33 is applied to the inner surface of the housing 2. The resist 33 and the coating 34 on the inner surface of the housing 2 supplement the white light from the power white LED 32 when observing the work through a magnifying lens (not shown), so that the work can be seen with a natural reddish color similar to sunlight. A red color like this is set.

1, 20, 30 ... Magnifier stand with illumination lamp (LED light emitting device of the present invention)
2 ... Annular housing 3 ... White LED
4 ... Diffusion plate 6, 31 ... Substrate 7, 33 ... Resist 8, 34 ... Painting of housing 2 inner surface 21a ... Red resist 21b ... Blue resist 32 ... Power white LED

Claims (4)

  In an LED light emitting device including a substrate on which a plurality of white LEDs are mounted, a housing that accommodates the substrate, and a diffusion plate that covers an opening of the housing, a resist applied to the substrate, and the housing An LED light-emitting device, wherein one or both of the coating colors on the inner surface of the LED is red.   2. The LED light emitting device according to claim 1, wherein green and / or blue is applied to one or both of the resist of the substrate to which the red color is applied and the inner surface of the housing.   The LED light emitting device according to claim 2, wherein the red area is larger than the green or blue area.   The LED light-emitting device according to claim 1, wherein the diffusion plate is white, milky white, or translucent.