White light LED lamp capable of controlling linear change of color rendering index through color filter

Abstract

The invention discloses a lamp with a white light LED capable of controlling the linear change of a color rendering index through a color filter. The lamp comprises a white light source, a narrow-band color filter, a focusing lens, a zoom lens and a light emitting lens which are arranged in sequence, the narrow-band filtering color piece can be driven by the driving device to rotate, light rays emitted by the white light source enter from the area, accounting for 90% of the glass area, of the film coating area corresponding to the narrow-band filtering color piece, and the narrow-band filtering color piece rotates in the rotating process. Light emitted by the white light source sequentially passes through the corresponding areas, wherein the percentage of the film coating area of the narrow-band filtering color piece to the glass area is gradually changed from 90% to 100%. According to the invention, the specific narrow-band filtering color sheet can be ingeniously utilized to filter the wide-band light source, so that the color rendering capability of light emitted by the lamp is greatly reduced, and a large-range and large-scale distortion effect is achieved.

Description

Technical Field

[0001] This invention relates to the field of stage lighting technology, and in particular to a lighting fixture that uses a white LED to control the linear change of the color rendering index through a color filter. Background Technology

[0002] With the development of stage lighting, the ever-changing nature of stage scenes has placed increasingly higher demands on the functionality of stage lighting. Current technologies typically alter the light color of the lighting fixtures by adjusting the phosphor ratio of the LED beads, or by using high color rendering index (CRI) sheets to increase the CRI Ra and R9. However, these CRI changes are insufficient to deliver a truly stunning visual impact to the audience, especially given the complex and ever-changing nature of stage performances. Summary of the Invention

[0003] The purpose of this invention is to provide a lamp that uses a white LED to control the linear change of the color rendering index through a color filter. It can cleverly utilize a specific narrow-band filter to filter a wide-band light source, thereby greatly reducing the color rendering ability of the light emitted by the lamp and achieving a large-scale distortion effect.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A luminaire that uses a white LED to linearly control the color rendering index via a color filter includes a white light source, a narrow-band filter, a focusing lens, a zoom lens, and a light-emitting lens arranged sequentially. The narrow-band filter is fan-shaped with a central angle of 270°. The percentage of the coated area in the glass area gradually increases from one end of the narrow-band filter to the other, with a minimum of 90% and a maximum of 100%. The narrow-band filter can rotate under the drive of a driving device. The light emitted by the white light source enters the glass from the area where the coated area of ​​the narrow-band filter accounts for 90% of the glass area. During the rotation of the narrow-band filter, the light emitted by the white light source passes sequentially through the areas where the percentage of the coated area of ​​the narrow-band filter gradually changes from 90% to 100%.

[0005] As a preferred embodiment of the present invention, the Ra of the white light source is greater than 90, and the R9 of the white light source is greater than 90.

[0006] As a preferred embodiment of the present invention, the light filtered by the narrow-band filter is light outside the wavelength range of 580nm-600nm.

[0007] As a preferred embodiment of the present invention, the driving device is a motor.

[0008] The luminaire provided by this invention, which uses a color filter to control the linear change of the color rendering index of a white LED, has the following advantages compared with the prior art: This invention relates to a white LED luminaire that achieves linear control of the color rendering index through a color filter. The narrow-band filter does not have a gradient from 0% to 90% of the glass area where the coated region occupies the glass area. During operation, the cut-in direction is from the 90% coated region gradually transitioning to the full-color region. Because the size of the narrow-band filter is limited, unlike conventional filters which gradually increase from 0% to 100% coating, this invention starts with a 90% coated region. This is because firstly, the brightness ratio of the coated region to the open region is approximately 1:9; secondly, in the low-proportion coated region stage (0%-90%), the composite light energy is highly dominant, and the distortion function is not apparent. Once the gradient reaches 90%, the brightness of the light emitted from the coated region becomes dominant, meaning the distorted light dominates. At this point, when linearly transitioning to the full-color region, the distortion effect increases significantly. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0010] Figure 1 This is a schematic diagram of the structure of a lamp that uses a white LED to control the linear change of the color rendering index through a color filter, according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a narrowband filter color chip.

[0011] Marked in the image: 1. White light source; 2. Narrow-band filter; 3. Focusing lens; 4. Zoom lens; 5. Light exiting lens. Detailed Implementation

[0012] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0013] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. It should be understood that the terms "first," "second," etc., are used in this invention to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0014] Please see Figures 1 to 2 A preferred embodiment of the present invention provides a lamp for controlling the linear change of the color rendering index of a white LED through a color filter. The lamp includes a white light source 1, a narrow-band filter 2, a focusing lens 3, a zoom lens 4, and a light-emitting lens 5 arranged sequentially. The narrow-band filter 2 is fan-shaped, with a central angle of 270°. The percentage of the coated area in the glass area gradually increases from one end of the narrow-band filter 2 to the other end, with a minimum of 90% and a maximum of 100%. The narrow-band filter 2 can rotate under the drive of a driving device. The light emitted by the white light source 1 enters the narrow-band filter 2 from the area where the coated area occupies 90% of the glass area. During the rotation of the narrow-band filter 2, the light emitted by the white light source 1 passes sequentially through the areas where the percentage of the coated area in the glass area gradually changes from 90% to 100%. In this embodiment, the driving device is preferably a motor.

[0015] The white LED implementing this invention achieves linear control of the color rendering index through a color filter. The narrow-band filter 2 does not have a gradient from 0% to 90% of the glass area where the coating area occupies the glass area. During operation, the filter enters the light spot of the lamp from the 90% coating area, gradually transitioning to the full-color area (i.e., 100% coating area). Because the size of the narrow-band filter 2 is limited, unlike typical filters which gradually increase from 0% to 100%, this invention starts with a 90% coating area. This is because, firstly, the brightness ratio of the coated area to the open area is approximately 1:9; secondly, in the low-proportion coating area stage (0%-90%), the composite light energy is dominant, and distortion is not apparent. Once the gradient reaches 90%, the brightness of the light emitted from the coated area becomes dominant, meaning distorted light dominates. At this point, the linear transition to the full-color area significantly increases the distortion effect. Figure 2 As shown, the coating area of ​​the narrow-band filter color filter 2 gradually increases linearly, making full use of the area of ​​the gradient color filter, contributing to the main function, and ensuring the uniformity of light mixing.

[0016] It should be noted that when light passes through the hollowed-out area, it is equivalent to light passing through transparent glass, resulting in minimal energy loss. The transmitted light energy is approximately 90% of the original energy, and the color remains unchanged. However, when light passes through the coated area, due to the coating system's design for a narrow wavelength range of approximately 40 nm, while the light source's spectral range is approximately 380 nm-780 nm, the light emitted by the light source loses up to 80% of its energy when passing through the coated area, and the color changes drastically. The difference in energy loss and color between the coated and hollowed-out areas is enormous. According to Grassmann's law, the mixing of two colors depends only on the relative brightness (i.e., their proportions) of the individual colors involved in the mixture, and is independent of their spectral composition details. The colors emitted from the coated and hollowed-out areas are represented by two points on the CIE 1931 chromaticity diagram. All possible colors formed by mixing these two colors fall on the line connecting these two points on the CIE 1931 chromaticity diagram. Without the final full-coating area, the light emitted from the hollowed-out area would always be much brighter than that emitted from the coated area. In this case, the optical system would not be able to achieve the desired distortion effect because there would always be other wavelengths of light with high brightness in the light.

[0017] For example, to improve color contrast, the white light source 1 is a white light source 1 with a high color rendering index (Ra) and a high R9. In this embodiment, the Ra of the white light source is greater than 90, and the R9 of the white light source is greater than 90. This allows for the production of more vibrant red, green, and blue light, as well as a wider color gamut. In the rich and varied performances of a stage, the use of a high color rendering index light source enables the lighting fixtures to produce light with high color rendering capabilities. When used on stage, it can better present the original colors of decorative objects on the stage and the actors' makeup, maximizing the restoration of the original stage atmosphere.

[0018] For example, the narrow-band filter 2 filters light outside the 580nm-600nm wavelength range. When the spectrum passes through this filter, it changes from a full-band spectrum to a narrow-band spectrum, producing a yellow light that is close to low-color-temperature white light, meeting the requirements for stage atmosphere applications. Because the light passing through this filter lacks most of the wavelengths, the colors of the missing wavelengths cannot be displayed under this light, turning into grayish-black, achieving a strong contrast effect of high display quality to complete loss of color rendering capability.

[0019] Of course, in other embodiments, the range of the filtering bands can be changed according to user needs to create different filtered colors.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A luminaire for controlling linear variation of color rendering index by color filter of white LED, characterized in that, The white light source, the narrow waveband filter color sheet, the focusing mirror, the zooming mirror and the light exit mirror are arranged in sequence; the narrow waveband filter color sheet is in the shape of a sector, the corresponding central angle of the sector is 270°, the percentage of the coated area to the glass area gradually increases from one end of the narrow waveband filter color sheet to the other end, the minimum value of the percentage of the coated area to the glass area is 90%, the maximum value of the percentage of the coated area to the glass area is 100%; the narrow waveband filter color sheet can rotate under the drive of the driving device, the light emitted by the white light source enters from the area where the percentage of the coated area to the glass area is 90%, and the light emitted by the white light source sequentially passes through the corresponding area where the percentage of the coated area to the glass area gradually changes from 90% to 100% during the rotation of the narrow waveband filter color sheet.

2. The luminaire according to claim 1, which uses a color filter to control the linear change of the color rendering index of a white LED, is characterized in that... The Ra of the white light source is greater than 90, and the R9 of the white light source is greater than 90.

3. The luminaire according to claim 1, which uses a color filter to control the linear change of the color rendering index of a white LED, is characterized in that... The light filtered by the narrow waveband filter color sheet is the light with a waveband other than 580nm-600nm.

4. The white LED lamp of claim 1, wherein the color temperature is linearly changed by the color filter. The driving device is an electric motor.

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