JP3349776B2 - Light color variable device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates are those which relate to the light color friendly disguise location that can be varied in countless Moreover continuously light color.

[0002]

2. Description of the Related Art Conventionally, as means for changing light color,
2. Description of the Related Art There is known an apparatus that changes the light color by transmitting or reflecting light of a specific wavelength by using the spectral characteristics of a dichroic filter.

[0003] For example, JP-A-1-161393 discloses that
A light source that emits light that passes through the dichroic filter;
With a light source that emits light reflected on this dichroic surface
There is disclosed an apparatus that includes two light sources and selectively emits light from each light source to obtain different light colors.

Japanese Patent Application Laid-Open No. 59-75284 discloses that a hollow body made of transparent glass is coated with a dichroic film having different spectral characteristics in a plurality of sections, and the inside of the hollow body is made to emit light. A body placement device is disclosed.

[0005]

Here, the mechanism for changing the light color in the former device will be described in detail. For example, the light source transmitting the filter is green light, and the light source reflecting on the filter surface is green light. Red light. On the other hand, the dichroic filter shows transmittance for green light,
When red light is reflected (impermeable), when only the green light source emits light, green light is obtained through the filter. When only the red light source emits light, the filter Red light reflected from the surface is obtained. When both the green light source and the red light source emit light, the transmitted light of the green light and the reflected light of the red light interfere with each other to obtain yellow light.

In the latter device, by rotating the hollow body, a light color corresponding to the spectral characteristics of the dichroic film through which light is transmitted can be obtained.

However, in each of the above-described devices, the number of light colors is limited, and the color changes are discontinuous.

Accordingly, the present invention has been made to solve such a problem, and it has been proposed that an arbitrary light color can be obtained.
Moni, continuously light color is changed shall be the object of providing an optical color variable <br/> equipment capable Rukoto.

[0009]

Light color varying device of the present invention According to an aspect of the light emitting means for emitting a projection light, projection light of a specific wavelength range with the projection light emitted from the light emitting means is incident
There a first dichroic filter that transmits the first
The projection light incidence spent permeable dichroic filter
Toru projection light of a specific wavelength region toward the illumination surface F while
A second dichroic filter over the first and a changing unit to change the incident angle of the projection light incident on the second dichroic IAI Kfir data, the first and second dichroic filters Noi deviation One is composed of a long-pass filter that transmits light in the long wavelength range and reflects light in the short wavelength range, and the other is a short-pass filter that reflects light in the long wavelength range and transmits light in the short wavelength range. And before
Serial change means opposing one side between the first and second dichroic filters, Ru der those configured to include a hinge mechanism for supporting rotatably each other.

[0010]

[Action] In light color varying device of the present invention uses a combination of first and second dichroic filters, these first
The incident angle of the projection light incident on the first and second filters is relatively changed for use.

The dichroic filter has a characteristic that a wavelength range of light to be dispersed changes according to an incident angle of light incident thereon, and exhibits a spectral characteristic corresponding to an incident angle of incident light. The spectral characteristics refer to spectral transmission characteristics and spectral reflection characteristics. By utilizing this characteristic and changing each wavelength range of the light separated by one dichroic filter and the light separated by the other dichroic filter, the light separated by the dichroic filter can be various light. Will change to a color. Note that by continuously changing the incident angle of the projection light , the light color also changes continuously.

And the projection light emitted from the light emitting means.
One is composed of a long-pass filter and the other is
First and second dichroic filters configured with
Spectral transmission with an Ic filter leads to the surface to be illuminated.
, The opposite of the first and second dichroic Kufiruta
Has a hinge mechanism that supports one side rotatably to each other
The first and second dichroic
The incident angle of the projection light entering the filter can be changed arbitrarily
The first and second dichroic filters
By changing the wavelength range of transmitted light arbitrarily,
And the light color is continuously changed
It becomes possible.

[0013]

EXAMPLES hereinafter be described with reference to light color varying device according to the present invention in the accompanying drawings.

1 to 5 show a first example of the base technology.
You.

FIG. 1 schematically shows the configuration of the light color variable device. The light color variable device is used as a light emitting means for irradiating white light.
The light emitted from the light source 1 is projected by a reflecting mirror 2 toward a polymerization filter 3.

This polymerized filter 3 is, as described later,
It is configured by polymerizing two types of dichroic filters having mutually different spectral characteristics. In addition, this polymerization filter 3
Are held in a holding frame 4. The holding frame 4 is rotatably supported inside a U-shaped support frame 6 by locking shafts 5 protruding from both sides thereof. One locking shaft 5
The gear 8 penetrates through the support frame 6, and a gear 8 is fixed to an end thereof. The rotation of the stepping motor 7 is transmitted to the gear 8, and the rotation of the stepping motor 7 causes the overlapping filter 3 to rotate about the locking shaft 5. Further, the stepping motor 7 is driven and controlled by a driver 9 based on the rotation amount indicated from outside the shown. Reference numeral 10 denotes a surface to be illuminated with projection light from the reflecting mirror 2 that has passed through the superposition filter 3.

FIG. 2 and FIG. 3 show the structure of the superposed filter 3. The polymerization filter 3 is made of a glass substrate N _o (n = 1.5
2) On top, a low refractive index SiO ₂ layer _NL (n = 1.46)
And a TiO ₂ layer N _H (n = 2.3) having a high refractive index are alternately laminated, and a dichroic filter called an A layer shown in FIG. ), A dichroic filter called a layer B is superposed.

[0018] The layer A, thickness on a glass substrate N _o 1 /
SiO ₂ layer 2dL (shown as 1 / 2N _L) was laminated,
On the upper side, a TiO ₂ layer (N _H ) having a thickness of dH and an S
iO ₂ Layers (N _L), laminated each five layers alternately in this order, constitute further laminated thickness 1 / 2dL SiO ₂ layer of a (displayed as 1 / 2N _L) thereon .

The B layer is made of TiO ₂ having a thickness of 1/2 dH.
On the upper side of the layer (1 / 2N _H ), a SiO ₂ layer ( _NL ) having a thickness of dL
And a TiO ₂ layer (N _H ) having a thickness of dH are alternately laminated in five layers in this order, and a TiO ₂ layer (1 / 2N _H ) having a thickness of ｄ dH is laminated on the uppermost surface. ing.

The film thicknesses dL and dH of the respective layers are determined by λ / (4N _L ) and λ / (4N _H ), respectively. In the device of this embodiment, λ = 500 nm for the A layer, and λ = 500 nm for the B layer. Is λ = 700 nm.

FIG. 4 shows the spectral characteristics of the polymerization filter 3. The polymerizing filter 3 has a characteristic that the wavelength range of light to be transmitted changes according to the incident angle of the light incident thereon, and each curve in FIG. 4 shows the spectral characteristic corresponding to the incident angle of the incident light. Is shown.

For example, in the overlapping filter 3 shown in this embodiment, when the incident angle of the projection light projected from the light source 1 is 0 °, that is, when the incident angle is equal to the normal to the incidence surface of the overlapping filter 3, As shown by the curve in FIG. 4, light in the wavelength range where the light color is red-orange is transmitted, and the incident angle is 27.
In the case of °, light in the wavelength range where the light color is yellow is transmitted as shown by the curve, and when the incident angle is 45 °, the wavelength range where the light color is green as shown in the curve Is transmitted. ,... Indicate the spectral characteristics at incident angles of 18 °, 24 °, 35 °, and 38 °, respectively. Note that the wavelength range of the transmitted light changes continuously as the incident angle changes.

Next, the operation of the thus-configured light color variable device will be described.

The white light emitted from the light source 1 is reflected by the reflecting mirror 2
Is projected toward the overlap filter 3, and the projection light transmitted through the overlap filter 3 illuminates the illuminated surface 10. The projection light illuminating the illuminated surface 10 is light of a specific wavelength range transmitted through the superposition filter 3 out of white light emitted from the light source 1, and the wavelength range is the projection light incident on the superposition filter 3. Changes in accordance with the incident angle of. Therefore, by changing the incident angle of the projection light incident on the superposition filter 3, the wavelength range of the projection light projected on the illumination target surface 10 changes,
The light color of the projection light illuminating the illuminated surface 10 changes.

The chart shown in FIG. 5 is based on the graph of FIG.
The incident angle of the projection light incident on the superposition filter 3 is made to correspond to the light color of light having spectral characteristics corresponding to the incident angle.

For example, when it is desired to illuminate the illuminated surface 10 with a red-orange light color, if the incident angle of the projection light on the superimposed filter 3 is 0 ° without rotating the superimposed filter 3, the light to be illuminated can be obtained. Surface 10 is illuminated red-orange. When it is desired to illuminate with a yellow light color, the angle of incidence of the projection
When it is desired to illuminate with a green light color so as to be 7 °, the incident angle of the projection light incident on the superposition filter 3 is 45 °.
The stepping motor 7 is driven to rotate so as to adjust the angle of the superposed filter 3.

[0027] The drive control of the stepping motor 7, the position where the incident angle is 0 ° as the initial position, step
It is desirable that the number of steps of rotation of the ping motor 7 and the angle of rotation of the overlap filter 3 correspond to each other.

[0028] In the present embodiment stearyl rotation of polymerization filter 3
Although the example in which the mappings motor 7, the locking shaft 5
May be configured to be rotatable with a rotary knob or the like, and may be manually rotated.

As described above, by rotating the polymerizing filter 3 and changing the incident angle at which the projected light enters the polymerizing filter 3, it is possible to obtain innumerable light colors, When the gradation changes, the change in gradation can obtain continuous illumination light.

When the present apparatus is used for an indoor lighting device, the illuminated surface 10 corresponds to a wall surface in a room.

[0031] Next, as a second example of the base technology in FIG. 6 illustrates a color variable filter using a polymer filter 3 described above to the camera.

In FIG. 6, the variable color filter is constructed by holding the superposed filter 3 in a rectangular holding frame 41, and the four sides of the holding frame 41 are respectively provided with the holding frame 41. A holder 42 for fixing the camera 41 to a lens barrel 46 of the camera is provided.

A locking shaft 43 is fixed on each side of the superposed filter 3, and the superposed filter 3 is rotatably supported inside the holding frame 41 by the locking shaft 43. One of the locking shafts 43 penetrates the holding frame 41, and a knob 44 provided with an index portion 44a is fixed to a penetrating distal end thereof. Therefore, by rotating the knob 44, the polymerization filter 3 is rotated.

The locking shaft 43 has a portion supported by the holding frame body 41 covered with a rubber material.
Is applied so that a sufficient frictional force can be maintained at that position. Therefore, when the knob 44 is operated to rotate the polymerization filter 3 to a desired position, the polymerization filter 3 is held at that position.

A scale 45 is provided between the knob 44 and the side surface of the holding frame 41 so that the angle of incidence of the photographic light incident on the superposed filter 3 can be known.

[0036] When using the color-tunable filter configured as described above to the camera, first, attaching the holder portion 42 to the distal end of the lens barrel 46 of the camera taking lens, the transmitted shot polymerization filter 3 Light is incident on the taking lens 47. Then, by operating the knob 44 to change the incident angle of the photographing light incident on the polymerization filter 3,
Light of a specific wavelength range read by the scale 45 enters the photographing lens 47 as photographing light.

Next, referring to FIG . 7 and FIG.
Explain with the third example of.

This light color variable device shows an example in the case where it is used for a lighting device as in the first example of the base technology .
According to this device, the color of the illumination light changes depending on the illumination position.

Reference numeral 21 denotes a parabolic reflecting mirror (hereinafter, referred to as a reflecting mirror) for projecting the light emitted from the light source 1 as a parallel light beam toward the superimposing filter 3. Together with the light source 1, it is fixed to a light source holder 22.

The light source holder 22 is provided with rollers 23 at two upper and lower positions. The rollers 23 are rotatably fitted in guide grooves 24a formed in a guide plate 24. The roller 23 is provided with a flange portion 23a projecting in the axial direction (see FIG. 8), and the flange portion 23a is engaged with the guide plate 24 in the axial direction. Therefore, the light source holder 22 is
While being guided by 24a, it is held so as to be displaceable along the side surface of guide plate 24.

The light source holder 22 is formed with a gear portion 22a, which meshes with the gear 8 to which the rotation of the stepping motor 7 is transmitted. Therefore, the light source holder 22 is driven by the stepping motor 7 to drive the gear unit.
The mechanism is configured to be vertically displaced along the side surface of the guide plate 24 while being guided by the guide groove 24a within the range where the gear 22a and the gear 8 mesh with each other.

The guide groove 24a and the gear portion 22a are arranged in an arc shape with the center of curvature at the center M of the superposed filter 3 arranged in the light projection direction. Therefore, the movement of the light source holder 22 described above is along an arc having the center of curvature M at the center M of the superimposed filter 3, so that the projection light projected from the reflecting mirror 21 is always at the center of the superimposed filter 3. The illumination target surface 10 is projected through M.

Next, the operation of the thus-configured light color variable device will be described.

First, the white light emitted from the light source 1 is converted into a parallel light beam by the reflecting mirror 21 and projected on the superposition filter 3. The projection light transmitted through the superposed filter 3 illuminates the illuminated surface 10. At this time, when the light source 1 is displaced as the light source holder 22 is displaced along the guide plate 24, the illumination position moves with this displacement.

The displacement of the light source 1 and the reflecting mirror 21, since displaced on an arc around the eccentric part M vertically in the polymerization filter 3, the incident angle of the projected light from the light source 1 entering the polymerization filter 3 , Changes with the displacement of the light source 1.

In response to the change in the incident angle, the wavelength range of the transmitted light passing through the polymerization filter 3 changes.
The color of the projection light that illuminates the illuminated surface 10 changes depending on the illumination position.

For example, in the base technology , when the light source 1 moves to the upper end position U, the incident angle of the light incident on the overlapping filter 3 becomes 0 °, and the lower part of the illuminated surface 10 is illuminated in red-orange. You.

[0048] Further, when the light source 1 is moved to the centered portion M, the incident angle of 27 ° next to the light incident on the polymerization filter 3, middle portions of the illuminated surface 10 is yellow illuminated.

Further, when the light source 1 moves to the lower end position D, the incident angle of the light incident on the overlapping filter 3 becomes 45 °, and the upper part of the illuminated surface 10 is illuminated in green.

When the color of the illumination light is changed, the driver 9 is controlled under the control of a control unit (not shown).
Thus, the stepping motor 7 is rotationally driven, and control is performed to position the light source 1 at a position where transmitted light of incident light has a desired light color.

The reason why the projection light is a parallel light beam is that the surface to be illuminated
This is because the contours of the ten illuminated parts are clarified so that a change in the illumination position can be clearly recognized.

The relationship between the incident angle of the projection light and the light color is the same as in FIG. 5 shown in the first example of the base technology .

As means for changing the angle of incidence of light on the superposition filter 3, as opposed to the present embodiment, by rotating the light source itself, the projection direction of the projection light projected from this light source is changed. However, in such a configuration, the position of the projection light transmitted through the polymerization filter changes with the rotation of the light source, so that the size of the polymerization filter needs to be increased in accordance with the range of the change. On the other hand, if the projection light is transmitted through the same position of the filter as in this embodiment, the filter may be small.

Here, FIG. 9 shows an example in which the light color variable device thus configured is applied to a fuel remaining indicator.

The light source 1 is displaced to positions f-m-e in the figure according to the remaining amount of fuel (displacement of the liquid surface) by a mechanism similar to the mechanism shown in the above-described base technology . That is, when the tank is full, the light source 1 is positioned at a position f at which the projected light from the light source 1 is incident on the superposed filter 3 at an incident angle of 45 °.
Is displaced. Further, when the half-Ri state, the position m projected light is incident at an incident angle of the polymerization filter 3 to 27 °, and the polymerization filter 3 projected light when the rest Slight state
Are respectively displaced so as to be at a position e where the light is incident at an angle of incidence of 0 °.

Therefore, in the display section D constituted by light diffusion or the like, the portion F is illuminated green at the position f and the portion M is illuminated yellow at the position m corresponding to the position of the light source 1.
Then, at the position e, the portion E is illuminated in red orange.

As described above, the remaining fuel amount can be known by changing the illumination position and the color of the illumination light in accordance with the remaining fuel amount.

The upper portion of the display D is illuminated when the fuel is full, the middle of the display D when the fuel is low, and the lower portion of the display D when the remaining fuel is low. As described above, it is desirable to dispose the display unit D at a predetermined angle with respect to the superposed filter 3.

Next, with reference to FIGS. 10 to 14, the onset
An embodiment of a bright light color variable device will be described .

The same components as those of the base technology are denoted by the same reference numerals, and description thereof is omitted.

The light color variable device according to the present embodiment is provided with two dichroic filters which are symmetrically different in spectral characteristics and are separated from each other.

The two dichroic filters (hereinafter referred to as filters) 3a and 3b are respectively held on both sides by holding arms 31a and 31b (FIG. 10A), and a bearing is formed at the lower end thereof. The locking pieces 31a 'and 31b' are formed (FIG. 10B). The U-shaped support frame 32
The locking piece 31a is supported by a support shaft 33 provided below the
′, 31b ′ are rotatably supported, and each filter 3a, 3b
b is supported rotatably around the support shaft 33 inside the support frame 32.

The open / close arms 34a and 34b are rotatably supported at one end where they abut each other by a guide pin 35. The guide pin 35 is vertically moved along a guide groove 32a formed in the support frame 32. It has a slidable structure.

When the guide pin 35 is moved upward along the guide groove 32a, the open / close arms 34a and 34b
Are separated from each other with the filter as the center, and the filter 3a,
3b is opened centering on the support shaft 33, and changes so that the incident angle of the projection light becomes large.

Conversely, when the guide pin 35 is moved downward,
The open / close arms 34a and 34b are closed with each other, and accordingly, the filters 3a and 3b rotate around the support shaft 33 in a direction approaching each other, and change so that the incident angle of the projection light becomes small.

When the guide pin 35 is located at the lower end of the guide groove 32a, the filters 3a and 3b are parallel to each other, and the incident angle of the projection light incident on each of the filters 3a and 3b is zero.
°.

Therefore, the holding arms 31a, 31b, the support frame
32, support shaft 33 and open / close arms 34a, 34b, etc.
Opposite sides of the filters 3a and 3b are rotatable relative to each other
Configure the supporting hinge mechanism, including this hinge mechanism
The incident angle of the incident light to each filter 3a, 3b
Changing means is configured.

As shown by the solid line in FIG. 12 (a), one filter 3a is shorter than the light having an incident angle of about 0 ° at a wavelength near 620 nm as a boundary. Light having a wavelength is transmitted, but light having a long wavelength is not transmitted but reflected (short-pass filter).

On the other hand, the other filter 3b
As shown by the solid line in FIG. 12 (b), for light having an incident angle to the filter 3b of 0 °, light having a wavelength shorter than 580 nm is reflected without being transmitted, and light having a longer wavelength is reflected. It has the property of transmitting light (long-pass filter).

As described above, the filter 3a spectrally transmits light in the shorter wavelength region and spectrally reflects light in the longer wavelength region, whereas the filter 3b transmits light in the longer wavelength region. These filters 3a and 3b have spectral characteristics that are symmetrically different from each other , such that the light is spectrally transmitted and light in the shorter wavelength region is spectrally transmitted.

Here, FIGS. 14A and 14B show each of the filters 3a and 3a.
3b shows the structure of 3b.

[0072] filter 3a, 3b is, SiO ₂ layer of low refractive index on a glass substrate N _o and (N _L), the high refractive index TiO ₂
The layer (N _H ) and the thin film layer are alternately deposited and laminated.

[0073] filter 3a, the thickness dL on a glass substrate N _o
Of SiO ₂ layers and TiO ₂ layers of dH film thickness are alternately laminated in this order, each having a thickness of 1/2 dL.
It is constituted by laminating iO ₂ layers (FIG. 14A).

[0074] filter 3b is, thickness of 1 on a glass substrate N _o
/ 2dH TiO ₂ layer, a dL SiO ₂ layer and a dH TiO ₂ layer are stacked in this order, 6 layers each in this order, and a dL SiO ₂ layer is further stacked thereon. A TiO ₂ thin film having a thickness of 1/2 dH is laminated on the uppermost surface (FIG. 14B).

The thicknesses dL and dH of the respective layers are determined by λ / (4N _L ) and λ / (4N _H ), respectively. In this embodiment, the filter 3a has λ = 500 nm.
In addition, λ = 700 nm is set for the filter 3b.

These filters 3a and 3b have such a characteristic that the wavelength range of transmitted light changes in a direction of becoming shorter as the incident angle of the incident light incident thereon increases, as shown in FIG. In (b), the wavelength range of the transmitted light when the incident angle of the incident light incident on each of the filters 3a and 3b is 45 ° is indicated by a dotted line.

Here, the operation of the thus configured light color variable device will be described.

Referring to FIG. 10, light emitted through light source 1 and reflecting mirror 2 becomes projection light, passes through filters 3a and 3b, and illuminates surface 10 to be illuminated. On this occasion,
The projection light transmitted through the filters 3a and 3b is applied to each of the filters 3a and 3b.
And the illuminated surface 10 is illuminated with the transmitted light in the wavelength range transmitted through the filters 3a and 3b .

That is, the filters 3a and 3b have an incident angle of 0 °.
Has the transmission characteristics shown by the solid lines in FIGS. 12A and 12B with respect to the incident light of FIG. 12, so that the transmitted light transmitted through the filters 3a and 3b is a part where the wavelength range of the transmitted light of the two filters 3a and 3b overlaps. In other words, about 580 nm to
It becomes light in the wavelength range of 620 nm.

When the guide pin 35 is moved upward,
Accordingly, the incident angle of the projection light incident on the filters 3a and 3b increases. For example, when the incident angle of the projection light becomes 45 °, the wavelength range of the light transmitted through each of the filters 3a and 3b is:
It has the transmission characteristics shown by the dotted lines in FIGS. Therefore, the transmitted light transmitted through the filters 3a and 3b is light in a wavelength range of about 580 nm to 520 nm, which is indicated by the hatched portion in FIG.

In this embodiment, the incident angles of the filters 3a and 3b change equally. However, if the incident angles of the filters 3a and 3b are respectively variable, the wavelength range of the transmitted light can be changed. Can be made variable, and the light colors can be varied.

A filter having the characteristic of transmitting light in a specific wavelength range with one filter, such as the polymerization filter 3 shown in the first example of the base technology, is expensive. However, as in the filters 3a and 3b shown in the present embodiment, a filter having a characteristic of transmitting light of a wavelength longer or shorter than this wavelength at a specific wavelength but not transmitting light of a shorter or longer wavelength than the specific wavelength. Since the filters 3a and 3b are inexpensive, an inexpensive light color changing device can be configured by combining filters 3a and 3b having different characteristics as in the present embodiment.

Further, the color variable filter for the camera shown in the second example of the base technology is composed of one superposed filter 3 , but as shown in this embodiment, two color filters which are opened and closed symmetrically to each other. If the filters 3a and 3b are used as filters for a camera, it is possible to obtain a filter for a camera in which optical axis shift does not occur .

[0084]

According to the light color variable device of the present invention, one of the light emitted from the light emitting means is used as the long-pass filter.
And the other is composed of a short-pass filter
The first and second dichroic in by the spectral transmittance click filter surface to be illuminated electrically transfected together, first and second dichroic
The opposite sides of the filter are rotatably supported on each other
The first and the second by the changing means having the hinge mechanism portion
Since the incident angle of the projection light incident on the second dichroic filter can be arbitrarily changed , an arbitrary light color can be obtained by arbitrarily changing the wavelength range of light spectrally transmitted by the first and second dichroic filters. Obtain and light color
It can be a change in succession.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a configuration of a light color variable device as a first example of a base technology .

FIG. 2 is a side view showing a configuration of a polymerization filter of the light color variable device .

Figure 3 shows the same as above polymerization filters, (a) shows the side surface of the A layer
FIG. 2B is a side view of the B layer.

FIG. 4 is a graph showing spectral characteristics of incident light corresponding to an incident angle in the same polymerization filter.

[5] and the curves shown in ibid 4 is a table showing the correspondence between emission colors achieved by the light having the spectral characteristics of the curve.

FIG. 6 is a perspective view schematically showing a configuration of a color variable filter as a second example of the base technology .

7 is a perspective view schematically showing a configuration of Iroka disguise location as the third example of the base technology.

FIG. 8 is a side view showing another side of the light source holder of the color changing device .

FIG. 9 is a schematic configuration diagram showing one embodiment of a light color variable device of the present invention .

[10] ditto (a) is a side view schematically showing a configuration of a light color varying device is a side view showing taken out (b) the holding arm.

11 is a plan view of the same light color varying device.

[12] ditto (a) shows a transmission characteristic of the filter 3a when the incident angle of the incident light morphism input becomes 0 ° and 45 °,
(b) is a graph showing the transmission characteristic of the filter 3b when the incident angle of the incident light morphism input becomes 0 ° and 45 °.

13 ditto (a) shows the wavelength range of transmitted light when the incident angle of the incoming Shako you enter the two filters 45 °, (b) is
The incident angle of the incoming Shako you enter the two filters is a graph showing the wavelength range of transmitted light when the 0 °.

[14] ditto (a) is a side view showing a configuration of a filter 3a,
(b) is a side view showing the configuration of the filter 3b .

[Explanation of symbols]

1 Light source 3a as light emitting means 1st dichroic filter 3b 2nd dichroic filter 10 Illuminated surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B 5/28 G02B 26/00 F21P 3/00

Claims (1)

(57) [Claims] 1. A light emitting means for emitting projection light, and a projection light emitted from the light emitting means enters and emits light.
A first dichroic filter through which projection light in a certain wavelength range is transmitted
A filter and the projection transmitted through the first dichroic filter.
As light enters, projected light in a specific wavelength range is projected onto the illuminated surface.
A second dichroic filter transmitting light toward the first and second dichroic filters;
Changing means for changing the angle of incidence of the projection light, wherein any one of the first and second dichroic filters is provided.
One transmits light in the long wavelength range and reflects light in the short wavelength range
It consists of a long-pass filter, and the other is a long-wavelength light
Short-pass filter that reflects light and transmits light in the short wavelength range
In the configuration, the changing means, opposing one side between the first and second dichroic filter, light color varying device you wherein Rukoto is configured to include a hinge mechanism for supporting rotatably each other .