JPH0672114U - Lighting equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a compact lighting fixture capable of irradiating light of a plurality of colors and subtly changing the irradiation light color. A light source 2 and a light guide 2 for preventing diffusion of irradiation light, and a dichroic filter 3 provided on the opposite side of the light guide 2 to the light axis so that an angle formed by an optical axis is variable.
Is equipped with. [Effect] The illumination light from the light source can be subtly changed by a simple operation of adjusting the angle of the dichroic filter to illuminate a plurality of colors, and a compact lighting fixture can be obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lighting device that can emit colored light by attaching a dichroic filter to the front surface of a light source.

[0002]

[Prior art]

 Conventionally, lighting equipment that emits colored light has a colored filter such as glass, plastic, or cellophane installed in the light path of the light emitted from the light source, a light source such as a bulb bulb colored red or yellow, and a bulb bulb. Some of them contained sodium gas or neodymium gas. Among these, the one capable of irradiating a plurality of colored lights with one light source uses a coloring filter.

There are the following two types of lighting fixtures that use colored filters.

One type has a light source, a color filter, and a lens housed in a rectangular parallelepiped or cylindrical container. The positions of the colored filter and the lens may be contained in the container in any order as long as the irradiation light is all colored light. The colored filter can be replaced. Other types are those in which a colored filter of multiple colors is mounted on the front surface of the lens of a rectangular parallelepiped or cylindrical container or between the light source and the lens on a disk-shaped part that rotates around the center of the disk, or a rectangular shape. It is installed on the parts of. Then, in these lighting fixtures, colored filters were manually or automatically selected to emit colored light.

[0005]

[Problems to be solved by the device]

 In a conventional lighting fixture that emits colored light, a large number of colored filters are provided in front of the light source, so that the lighting fixture itself becomes large. However, if the lighting fixture itself is not made large, the number of coloring filters installed will be small, and there is the problem that subtle changes in color cannot be applied. .

Therefore, the present invention has been made in consideration of the above circumstances, and provides a compact lighting fixture capable of irradiating a plurality of colored lights with a single dichroic filter and capable of subtly changing the irradiation light color. The purpose is to provide.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a light source with a reflection mirror, a light guide provided on the opening side of the light source with a reflection mirror to suppress the diffusion of light, and the light guide with the reflection mirror. On the opposite side of the light source, a dichroic filter with a variable angle with the optical axis is provided.

[0008]

[Action]

 In the lighting apparatus of the present invention, the light guide passes all the light emitted from the light source through the dichroic filter, so that the colored light becomes clear. By changing the angle of the dichroic filter, the transmittance characteristic shifts and the color of the irradiation light changes slightly.

[0009]

【Example】

 An embodiment of the present invention will be described with reference to FIGS.

In the lighting equipment of the present invention, a light source 2 with a reflection mirror and an opening side of the light source 2 with a reflection mirror are provided in a rectangular parallelepiped outer container 1 in which a condenser lens 5 is fitted on one opening side. In addition, a cylindrical light guide 3 for preventing the diffusion of the light emitted from this light source, and on the other side of this light guide 3, a square glass that decomposes the light components and transmits only any color The dichroic filter 4 made of the light guide 3 and the condenser lens can be tilted up to an angle of 40 ° with respect to each of the light guide 3 side and the condenser lens 5 side with the center of the opposite side faces as a fulcrum. It is located almost at the center of 5.

The fulcrum of the dichroic filter 4 is a recess, and holes are made in the portion of the rectangular parallelepiped outer container 1 on the extension line connecting the two fulcrums, and shaft rods are inserted through these holes and fixed in the recess. There is. At least one of the shaft rods protrudes to the outside of the rectangular parallelepiped outer container 1, and a knob is provided at the tip thereof so that the angle of the dichroic filter 4 can be adjusted by rotating the knob clockwise or counterclockwise. It has become.

Regarding the size relationship of each part, the outer diameter of the opening of the light source 2 with a reflection mirror and the outer diameter of the opening of the light guide 3 are equal or larger in the light guide 3. The dichroic filter 4 is large enough to pass all the light from the light guide 3 at an inclination angle of 40 °. The cylindrical outer container 1 is sized to include the dichroic filter 4.

The tilt angle is 0 ° when the dichroic filter 4 is orthogonal to the irradiation light in FIG. 2, and the dichroic filter 4 and the dichroic filter 4 in this state are tilted toward the condenser lens 5 side or the light guide 3 side. It is the angle θ that is created.

The present embodiment having this configuration will be described below. The color of the irradiation light is evaluated by visual perception of the color tone and CIE chromaticity coordinate measurement using a standard tungsten light bulb.

In the following examples, the relationship between the tilt angle of the dichroic filter 4 and the irradiation light color is the same regardless of whether the dichroic filter 4 is tilted toward the condenser lens 5 side or the light guide 3 side if the same angle is obtained. To be

Example 1 Case of Red Transmission Dichroic Filter A wavelength of 653 nm as shown in FIG. 3 has a transmittance of 50%, a wavelength of 671 nm or more and a wavelength of 780 nm or less is a transmittance of 80% or more, and a wavelength of 380 nm or more and a wavelength of 620 nm or less is transmitted. A red transmission dichroic filter having a rate of 10% or less is used, and Table 1 shows the relationship between the angle and the irradiation light color.

[0017]

[Table 1]

When the red transmission dichroic filter is tilted at an angle of 40 °, the transmittance is 50% at a wavelength of 618 nm and 60% or more at a wavelength of 633 nm or more and 780 nm or less, as shown in FIG. The transmittance at wavelengths of 380 nm or more and wavelengths of 568 nm or less was 10% or less.

Therefore, since the transmittance curve shifts to the short wavelength side, all colors from dark red to dark orange in the range of angles of 0 ° to 40 ° can be irradiated.

Example 2 Case of Blue Transmission Dichroic Filter A wavelength of 523 nm as shown in FIG. 4 has a transmittance of 50%, a wavelength of 540 nm or more and a wavelength of 780 nm or less is 10% or less, and a wavelength of 380 nm or more and a wavelength of 516 nm or less is transmitted. A blue transmission dichroic filter having a rate of 80% or more is used, and the relationship between the angle and the irradiation light color is shown in Table 2.

[0021]

[Table 2]

When the blue transmission dichroic filter is tilted at an angle of 40 °, the transmittance is 50% at a wavelength of 475 nm and is 10% at a wavelength of 500 nm or more and 780 nm or less, as shown in FIG. The transmittance at wavelengths of 380 nm or more and wavelengths of 468 nm or less was 60% or more.

Therefore, since the transmittance curve shifts to the short wavelength side, all the colors from green blue to violet in the angle range of 0 ° to 40 ° can be emitted.

Example 3 Yellow Transmission Dichroic Filter A wavelength 558 nm as shown in FIG. 5 has a transmittance of 50%, a wavelength of 570 nm or more and a wavelength of 780 nm or less is 80% or more, and a wavelength of 385 nm or more and a wavelength of 528 nm or less is transmitted. A yellow transmission dichroic filter having a rate of 10% or less is used, and the relationship between the angle and the irradiation light color is shown in Table 3.

[0025]

[Table 3]

When the yellow transmission dichroic filter is tilted at an angle of 40 °, the transmittance is 50% at a wavelength of 528 nm, and the transmittance is 60% or more at a wavelength of 539 nm or more and 780 nm or less. The transmittance at wavelengths of 380 nm or more and 484 nm or less was 10% or less.

Therefore, since the transmittance curve shifts to the short wavelength side, all the colors from orange to yellow in the range of angles of 0 ° to 40 ° can be irradiated.

However, when the angle of the dichroic filter 4 is set to be larger than 40 °, the transmittance of the irradiation light is remarkably lower than that when the angle is 0 °, and most of the irradiation light from the light source is reflected. The theoretical calculation shows that the irradiation light is totally reflected when the angle is 41 ° or more. Therefore, the inclination angle is preferably 40 ° or less.

In the above embodiment, the angle adjustment of the dichroic filter 4 is such that the knob is set at an angle of 5 ° and the stopper does not rotate more than 40 °.

In the embodiment of FIG. 9, the fulcrum for adjusting the angle of the dichroic filter 4 is located below the center of the side surface, and the dichroic filter 4 is arranged on the light guide 3 side. At this time, the angle of the dichroic filter 4 is adjusted from the outside of the cylindrical outer container 1 by a knob type stopper every 5 ° and tilted to the condensing lens 5 side up to 90 °. In this embodiment, it is possible to irradiate two kinds of light, that is, colored light that passes through the dichroic filter 4 and irradiation light from a light source that does not pass through the dichroic filter 4.

Even in the dichroic filters that transmit colors other than those in this embodiment, the transmittance characteristic shifts to the short wavelength side and the color changes due to the change in the value of θ. Even a dichroic filter made of a material other than glass will show a change in color as long as it transmits light.

In the above embodiment, the dichroic filter 4 has a square shape, but may have any shape as long as it does not leak the light from the light guide 3 when the angle is 40 °. The fulcrum for adjusting the angle of the dichroic filter 4 is that the dichroic filter 4 has a polygonal shape, and if two points do not coexist on the same side and a line connecting these two points is used as an axis, no matter which side the fulcrum is provided, the angle can be adjusted. You can make changes. Alternatively, a disc shape with two fulcrums on the circumference and a line connecting the two points as an axis can be used to change the angle.

Further, the fulcrum on the dichroic filter 4 does not have to be two, and may be one.

[0034]

[Effect of device]

 As described above, in the present invention, since the lighting equipment is configured as described above, the irradiation light color can be changed by a simple operation of adjusting the irradiation light from the light source from 0 ° to 40 ° of the dichroic filter. A compact lighting fixture that can be subtly changed and that can emit multiple colored lights can be obtained.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram showing an inclination angle θ of the present invention.

FIG. 3 is a spectral transmittance characteristic of the red transmissive dichroic filter of this example at an incident angle of 0 °.

FIG. 4 is a spectral transmittance characteristic of a blue transmission dichroic filter of this example at an incident angle of 0 °.

FIG. 5 is a spectral transmittance characteristic of the yellow transmission dichroic filter of the present embodiment at an incident angle of 0 °.

FIG. 6 is a spectral transmittance characteristic of the red transmissive dichroic filter of this example at an incident angle of 40 °.

FIG. 7 shows the spectral transmittance characteristics of the blue transmission dichroic filter of this example at an incident angle of 40 °.

FIG. 8 is a spectral transmittance characteristic of the yellow transmission dichroic filter of the present embodiment at an incident angle of 40 °.

FIG. 9 is a conceptual view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Cylindrical outer container 2 Light source with reflection mirror 3 Light guide 4 Dichroic filter 5 Condenser lens

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[Procedure amendment]

[Submission date] February 25, 1994

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

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[Fig. 2]

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[Figure 6]

[Figure 7]

[Figure 8]

[Figure 9]

Claims (1)

[Scope of utility model registration request] 1. A light source with a reflection mirror, a light guide provided on the opening side of the light source with the reflection mirror to suppress light diffusion, and an optical axis on the opposite side of the light guide with the reflection mirror. And a dichroic filter having a variable angle formed by the lighting fixture.