TW201319718A - Color wheel, color wheel assembly method and light source using the same - Google Patents

Abstract

The present invention relates a color wheel, its assembly method and a light source using the color wheel. The color wheel comprises a first base layer, an optical wavelength conversion layer, and a second base layer, wherein the color wheel further comprises a spacer sheet, located between the first base layer and the second base layer, arranged at the same layer as the optical wavelength conversion layer, and having its thickness no less than that of the optical wavelength conversion layer. In the present invention, by means of disposing the spacer sheet located between the first base layer and the second base layer at the same layer of the optical wavelength conversion layer with its thickness no less than the optical wavelength conversion layer, the gap between the first base layer and the second base layer is even, so as to ensure the color wheel providing more stable light output efficiency during operation. Further, by means of adjusting the thickness of the spacer sheet, the gap between the first base layer and the second base layer can be adjusted, thereby adjusting the light emitting efficiency of the color wheel.

Description

Color wheel, assembly method thereof and light source using the same

The present invention relates to the field of light sources for illumination and display, and more particularly to a color wheel, an assembly method thereof, and a light source to which the color wheel is applied.

Currently, projectors are widely used in various occasions such as movie broadcasting, conferences, and publicity. It is well known that in the light source of a projector, a color wheel is often used to provide a sequence of colored light. Wherein, different color segments of the color wheel are alternately and periodically arranged on the propagation path of the excitation light, and then the excitation light is used to excite the light wavelength conversion material on different color segments of the color wheel to generate excited colors of different colors. Light.

Figure 1 shows a conventional color wheel component comprising a color wheel 2' and a motor 1' for driving the rotation of the color wheel 2'. The color wheel 2' includes receiving and transmitting excitation light provided by the excitation light source. a first filter 23', a light wavelength conversion material layer 22' that receives the excitation light and converts the excitation light into the excitation light, and a second filter 21' that transmits the excitation light, the first filter The sheet 23' and the second filter 21' sandwich the light wavelength conversion material layer 22'. The color wheel of the prior art usually directly bonds the two sides of the light wavelength conversion material layer 22' to the first layer directly using glue or tape. The filter 23' and the second filter 21'. In the color wheel assembly process of the above structure, since the pressure applied between the first filter and the second filter is controlled to control the spacing between different positions between the first filter and the second filter, it is possible It appears that the uneven spacing between the different positions of the first and second filters due to the uneven pressure during the assembly process cannot clamp the wavelength of the light. The material layer 22' is changed so that the light wavelength conversion material layer 22' is easily moved, so that the light output efficiency of the color wheel is unstable.

In view of this problem, it is necessary to provide a color wheel, an assembly method thereof, and a light source to which the color wheel is applied.

Therefore, in view of the above problems, an object of the present invention is to provide a color wheel, an assembly method thereof, and a light source to which the color wheel is applied, wherein the distance between different positions of the first base layer and the second base layer of the same color wheel is equal.

In order to achieve the object of the present invention, the present invention adopts the following technical solution: providing a color wheel comprising a first base layer, a light wavelength conversion layer and a second base layer, wherein the color wheel further comprises a first base layer and a second base layer A spacer disposed between the base layers and the light wavelength conversion layer in the same layer and having a thickness not less than the wavelength conversion layer of the light.

In order to achieve the object of the present invention, the present invention also adopts the following technical solution: a color wheel comprising a first base layer, a light wavelength conversion layer, a second base layer, and a spacer having a thickness not less than the optical wavelength conversion layer; The method comprises: a) bonding one side of the spacer to the first base layer; b) bonding the light wavelength conversion layer to the second base layer; c) bonding the other side of the spacer to the second base layer, and the spacer and the spacer The light wavelength conversion layer is disposed in the same layer.

Compared with the prior art, the present invention transmits a spacer having a thickness not less than that of the optical wavelength conversion layer, and both sides of the spacer are respectively opposed to the first base layer and the second base layer, since the two sides of the spacer are parallel to each other, A base layer and a second base layer are also parallel to each other such that the spacing between the first base layer and the second base layer of the same color wheel is The first base layer and the second base layer can relatively stably clamp the light wavelength conversion layer, thereby ensuring a relatively stable light extraction efficiency during the color wheel operation.

In the following, the invention will be further elucidated with reference to specific embodiments shown in the drawings.

Please refer to FIG. 2 and FIG. 3, which are cross-sectional views of a first embodiment of a color wheel assembly according to the present invention. The color wheel assembly includes a color wheel 2 and a driving color wheel 2 for rotation. A motor 1. The color wheel 2 includes a first base layer 23 and a second base layer 21 which are laminated, and a light wavelength conversion layer 22 and a spacer sandwiched between the first base layer 23 and the second base layer 21.

The light wavelength conversion layer 22 is generally annular and includes at least one segment (not shown), and each segment is provided with a light wavelength conversion material that excites the excited light of a color different from the other segments. The light wavelength conversion material contains a phosphor powder, a fluorescent dye, a nano material, or the like. The light wavelength conversion layer 22 may also include at least one excitation light transmissive section of the wavelength-free conversion material.

The color wheel generally includes a transmissive color wheel and a reflective color wheel. When the transmissive color wheel is selected, the first base layer 23 disposed on the excitation light propagation path may be a first filter that transmits the excitation light and reflects the excited light; the second base layer 21 may select a transmission corresponding and a color wheel. Different colors of the excitation light of the different wavelength conversion sections or a second filter corresponding to the excitation light of the excitation light transmission area of the wavelength-free conversion material.

When the reflective color wheel is selected, the second base layer 21 disposed on the propagation path of the excitation light may be selected with different colors of the excitation light and different sections of the corresponding color wheel. A third filter, the first base layer 23 can be selected from a reflective sheet.

The first base layer 23 and the second base layer 21 may not have filtering or reflecting characteristics. In this case, a filter or a reflecting sheet may be added outside the first base layer or the second base layer as needed.

The two sides of the spacer are parallel to each other. The spacer should be made of a material that is hard, not easily deformed, and resistant to pressure, such as a metal sheet. The spacer is disposed in the same layer as the light wavelength conversion layer 22, and the thickness of the spacer is not less than the thickness of the light wavelength conversion layer 22. The two sides of the spacer are respectively in close contact with the first base layer 23 and the second base layer 21. In the embodiment of the present invention, the two sides of the spacer are respectively adhered to the first base layer 23 and the second base layer 21 by means of dispensing. Referring to FIG. 3, the spacer includes a first spacer 25 located outside the optical wavelength conversion layer and a second spacer 24 located at the center of the optical wavelength conversion layer. The first spacer 25 and the second spacer 24 have the same thickness, and an air gap 26 is formed therebetween, and the light wavelength conversion layer 22 is located in the air gap 26. The thickness of the first spacer 25 and the second spacer 24 is 0.02 to 0.30 mm.

In general, the thickness of the spacer is larger than the thickness of the light wavelength conversion layer 22. The light wavelength conversion layer between the first base layer 23 and the second base layer 21 may be connected to the first base layer 23 or the second base layer 21. When the thickness of the spacer is larger than the thickness of the light wavelength conversion layer, if the light wavelength conversion layer is connected to the first base layer 23 away from the exit light interface, a gap is formed between the light wavelength conversion layer 22 and the second base layer 21. An air gap, the presence of the air gap is beneficial to both the heat dissipation of the light wavelength conversion layer 22 and the large angle of incidence incident into the air gap through the conversion of the light wavelength conversion layer After the excited light enters the second base layer, the emitted light that is refracted into a small angle is emitted so that the optical spread of the excited light becomes small, thereby increasing the exit luminance of the excited light. The size of the air gap can be adjusted by adjusting the difference in thickness between the spacer and the light wavelength conversion layer 22.

When the thickness of the spacer is larger than the thickness of the light wavelength conversion layer, if the light wavelength conversion layer 22 is connected to the second base layer 21, an air gap is formed between the light wavelength conversion layer 22 and the first base layer 23. The presence of the air gap facilitates heat dissipation of the light wavelength conversion layer 22.

The present embodiment of the present invention shows a case where the optical wavelength conversion layer is connected to the second base layer 21. In practical applications, the optical wavelength conversion layer may be selectively connected to the first base layer 23 or not connected to any base layer according to specific use requirements. When the optical wavelength conversion layer 22 is not connected to the base layer, the inner base layer 23, the second base layer 21, and the inner ring of the optical wavelength conversion layer are connected by applying a center glue to the center of the ring of the light wavelength conversion layer 22. Therefore, it is ensured that the light wavelength conversion layer 22 does not move in either direction in the color wheel; in the embodiment of the invention, since the center of the light wavelength conversion layer 22 is provided with the second spacer 24, the center glue is applied to The outer layer of the second spacer. The connection of the light wavelength conversion layer 22 to the first base layer 23 or the second base layer 21 can adhere the light wavelength conversion layer to the first base layer 23 or the second base layer 21 by means of dispensing.

"Fig. 4" to "6th drawing", "10th drawing" to "11th drawing" are specific embodiments of the first spacer 25 in the present embodiment of the present invention. The first spacer 25 located on the outer circumference of the light wavelength conversion layer 22 is generally annular or ring-like, and includes For example, the whole ring shown in "Fig. 4", the plurality of first pieces shown in "Fig. 6", and the non-closed ring pieces having openings are three cases. The inner space of the first spacer is determined according to the actual situation. Generally, the inner diameter of the annular or ring-like first spacer 25 is equal to the outer diameter of the optical wavelength conversion layer 22.

The cross section of the first piece shown in Figure 5 is a ring segment. In practical applications, the cross section of the first piece can also be other shapes, such as triangular, trapezoidal, square, etc., convex, polygonal, etc. A closed figure surrounded by curved lines such as a concave polygon, a circle, an ellipse, and a crescent, and a closed figure composed of a straight line segment and an arc line. The size and shape of the first piece in the splicing ring formed by splicing together the first pieces may be different. The first spacer consisting of a plurality of first fragments comprises at least two first fragments; adjacent first fragments may abut or separate from each other.

In order to facilitate the dispensing of the first spacer 25 to the first and second base layers 23, 21, the first base layer 23 and the second base layer 21 may be passed through the integral ring, the unclosed ring or the first piece. For example, please refer to "Fig. 4" for the example of "opening the first hole" on the two sides of the ring. For example, please refer to "11" for the example of opening the first hole in the ring. The diameter of the first orifice is 1.0 to 1.5 mm.

"Fig. 6" - "8th drawing", "12th drawing" - "fifteenth drawing" is a specific embodiment of the second spacer 24 of the present embodiment of the present invention. The second spacer 24 located on the inner circumference of the light wavelength conversion layer 22 includes a solid wafer as shown in FIG. 6, a hollow wafer as shown in FIG. 7, and a "12th" diagram. a solid disc with a slit in the center of the circle, a hollow disc with a slit from the center as shown in Fig. 14 and a second Fragments (not shown) are several cases. In the present embodiment of the present invention, there is no limitation on the shape of the second fragment; when the second spacer 24 is the second fragment, the second spacer 24 is directly composed of one second fragment, and more than two are included. The second fragments are combined to form a second spacer; when the second spacers are composed of a plurality of second fragments, the size and shape of the second spacers formed together may be different. In general, the size of the second spacer 24 matches the inner diameter of the light wavelength conversion layer 22; when the second spacer 24 is a solid wafer or a hollow wafer, the diameter of the second spacer 24 and the wavelength of the light are converted. The inner diameter of layer 22 is equal.

In order to facilitate the dispensing of the second spacer 24 to the first and second base layers 23, 21, the hollow disc, the solid disc, the solid disc with the slit from the center of the circle, and the hollow disc with the slit opened from the center can be used. And a second small hole is formed in the second piece on the two sides of the first base layer 23 and the second base layer 21, and an example of "opening the second hole" in the hollow piece, please refer to "Fig. 8", and the slit is opened from the center of the circle. For an example of a solid wafer, please refer to "Fig. 13". For an example of a hollow disc with a slit from the center, please refer to "Fig. 15"; the second hole has a diameter of 1.0 to 1.5 mm.

The fixing between the spacer and the first and second base layers 23, 21 may have other fixing means in addition to the above-mentioned dispensing, for example, mechanically connecting the fixing piece to the first and second base layers 23, 21. Or, a fixing device or the like is added to the outer circumferences of the first and second base layers 23, 21.

In the embodiment of the present invention, a spacer having a thickness not less than a light wavelength conversion layer is disposed, and both sides of the spacer are respectively opposed to the first base layer 23 and the second base layer. 21, since the two sides of the spacer are parallel to each other, the first base layer and the second base layer are also parallel to each other, so that the spacing between the first base layer and the second base layer of the same color wheel is equal, so that the first base layer and the second base layer The base layer can hold the light wavelength conversion layer relatively stably, thereby ensuring a relatively stable light extraction efficiency during the color wheel operation. The spacing between the first and second base layers 23, 21 can also be adjusted by adjusting the spacer thickness. Moreover, through the arrangement of the inner and outer two-way spacers, the first base layer and the second base layer are relatively uniformly supported, which can effectively avoid the first brittle material such as the fracturing glass in the assembly process. , two base layers 23, 21.

Please refer to FIG. 15 and FIG. 16 and FIG. 15 is a cross-sectional view showing a second embodiment of the color wheel member of the present invention. The color wheel member includes a color wheel 2 and a rotating color wheel 2 Motor 1. The color wheel 2 includes a first base layer 23 and a second base layer 21 laminated, and a light wavelength conversion layer 22 and a spacer sandwiched between the first base layer 23 and the second base layer 21. The light wavelength conversion layer 22 is connected to the second base layer 21, and the two side faces of the spacer are in close contact with the first base layer 23 and the second base layer 21, respectively.

Unlike the first embodiment, the optical wavelength conversion layer 22 in the present embodiment of the present invention is in an incomplete annular shape. The light wavelength conversion layer 22 includes at least one section (not shown), and each section is provided with a light wavelength conversion material that excites the excited light of a color different from the other sections. The region of the second base layer 21 that is not covered by the light wavelength conversion layer transmits the excitation light transmission region (not shown) of the excitation light.

Referring to FIG. 15 and FIG. 16, the spacer includes a first spacer 25 and a second spacer 24. A astigmatism sheet 27 is placed in the excitation light transmission region, The light sheet 27 is spliced with the light wavelength conversion layer 22 to form a circular ring, and the ring is located between the first spacer 25 and the second spacer 24; the thickness of the astigmatism sheet 27 is not greater than the first and second spacers 24, 25 thickness.

The first spacer 25 is located at the periphery of the ring in which the astigmatism sheet 27 and the light wavelength conversion layer 22 are spliced; the second spacer 24 is located inside the ring in which the astigmatism sheet 27 and the light wavelength conversion layer 22 are spliced. The specific implementation of the first spacer 25 and the second spacer 24 is consistent with the first embodiment of the color wheel assembly of the present invention.

The above two examples are all examples of a circular color wheel that performs a circular motion. In order to obtain a better use effect, the inner and outer two-space spacers are added between the first and second base layers of the color wheel, which not only makes The spacing between the first and second base layers of the same color wheel is equal, and the pitch size can be adjusted by adjusting the thickness of the spacer; at the same time, the fixture can be prevented from fracturing the first and second base layers during assembly, thereby improving the yield. Therefore, in practical applications, in order to make the spacings at different positions between the first and second base layers of the same color wheel equal, only one of the first and second spacers mentioned above may be used. Among the inner and outer spacers, the second spacer located on the outer ring is preferred because the outer spacer can better provide a uniform spacing between the two substrates.

For the same reason, the spacer can also be applied to a linear color wheel of linear motion. For example, a spacer having a substantially rectangular frame shape is added to the periphery of the rectangular color wheel, and the spacer is sandwiched between the first and second base layers to achieve the first base layer of the same rectangular color wheel. A requirement for equal spacing at different locations between the second substrate.

Please refer to "FIG. 17", the present invention also provides a method for assembling a color wheel, The color wheel of the first embodiment of the present invention will be described as an example.

The color wheel includes a first base layer 23, a second base layer 21, a light wavelength conversion layer 22, and a spacer. The spacer includes a first spacer 24 and a second spacer 25. Fig. 16 is a flow chart showing the first embodiment of the color wheel assembling method. The method includes the following steps: Step S1, bonding one side of the spacer to the first base layer.

Wherein one side of the first spacer is adhered to the edge of the first substrate adjacent to the edge, and one side of the second spacer is adhered to the center of the first substrate; a side of the first spacer And a side surface of the second spacer is respectively adhered to the bonding process of the first base layer, and the thickness of the adhesive glue is controlled to not exceed 0.01 mm.

In step S2, the light wavelength conversion layer is bonded to the second base layer.

In this step, the light wavelength conversion layer is adhered to the second substrate by dispensing. When dispensing, the diameter of the control bonding point is 1.0~1.5 mm.

In fact, there is no difference between step S1 and step S2, and the order of the steps may be performed at the same time.

In step S3, the other side of the spacer is bonded to the second base layer, and the spacer is distributed in the same layer as the optical wavelength conversion layer.

In this step, the other side of the first spacer is adhered to the position near the edge of the second base layer, and the other side of the second spacer is adhered to the central position of the second base layer; An air gap is formed between the sheet and the second spacer, and the light wavelength conversion layer is located in the air gap. The other side of the first spacer, the second The other side of the spacer is respectively adhered to the bonding process of the second base layer, and the thickness of the adhesive glue is controlled to not exceed 0.01 mm.

Compared with the prior art, the color wheel is assembled by the above method, the gap between the first base layer 23 and the second base layer 21 is uniform, the assembly method is simple, the assembly process is controllable, and the assembly efficiency is high.

The first embodiment of the above color wheel assembling method is a case where the light wavelength conversion layer 22 is connected to the first base layer 23. The first base layer and the second base layer in the color wheel assembly method are exchanged, and the light wavelength conversion layer 22 is connected to the second base layer.

The invention also provides an embodiment of a light source.

The light source comprises an excitation source and a color wheel as described in the above embodiments. The laser light source can be a laser light source; it can also be a semiconductor light source, such as a Light Emitting Diode (LED) light source. The excitation light source emits light into the color wheel to generate an excitation light.

Compared with the prior art, the present invention transmits a spacer having a thickness not less than that of the light wavelength conversion layer, the two sides of the spacer being respectively opposed to the first base layer and the second base layer, since the two sides of the spacer are parallel to each other, The base layer and the second base layer are also parallel to each other, so that the spacing between the first base layer and the second base layer of the same color wheel is equal, so that the first base layer and the second base layer can relatively stably sandwich the light wavelength conversion layer, thereby It ensures a relatively stable light extraction efficiency during the color wheel operation.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. Modifications and refinements are made without departing from the spirit and scope of the present invention. It is within the scope of patent protection of the present invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

1‧‧‧Motor

2‧‧‧Color wheel

21‧‧‧ second base

22‧‧‧Light wavelength conversion layer

23‧‧‧ first grassroots

24‧‧‧Second spacer

25‧‧‧First spacer

26‧‧‧Air gap

27‧‧‧ astigmatism

1'‧‧‧ motor

2’‧‧‧Color wheel

21’‧‧‧Secondary filter

22'‧‧‧Light wavelength conversion material layer

23’‧‧‧First Filter

1 is a cross-sectional view of a color wheel element of one of the prior art; FIG. 2 is a cross-sectional view of a first embodiment of the color wheel assembly of the present invention; and FIG. 3 is a spacer of the color wheel shown in FIG. A top view of the arrangement of the light wavelength conversion layers.

Figure 4 is a schematic view of a first embodiment of the first spacer in Figure 2; Figure 5 is a schematic view of a second embodiment of the first spacer in Figure 2; 2 is a schematic view of a third embodiment of the first spacer; FIG. 7 is a schematic view of the first embodiment of the second spacer in FIG. 2; and FIG. 8 is the second of FIG. A schematic view of a second embodiment of the spacer; FIG. 9 is a schematic view of a third embodiment of the second spacer in FIG. 2; and FIG. 10 is a fourth embodiment of the first spacer in FIG. FIG. 11 is a schematic view showing a fifth embodiment of the first spacer in FIG. 9; and FIG. 12 is a schematic view showing a fourth embodiment of the second spacer in FIG. 9; FIG. FIG. 14 is a schematic view showing a fifth embodiment of the second spacer in FIG. 9; FIG. 14 is a schematic view showing a sixth embodiment of the second spacer in FIG. 9; and FIG. 15 is a view in FIG. A schematic view of a seventh embodiment of a second spacer; FIG. 16 is a cross-sectional view of a second embodiment of the color wheel member of the present invention; Fig. 17 is a plan view showing the spacer of the color wheel and the arrangement of the light wavelength conversion layer and the astigmatism sheet shown in Fig. 16; and Fig. 18 is a flow chart showing the method of assembling the color wheel according to the embodiment of the present invention.

1‧‧‧Motor

2‧‧‧Color wheel

21‧‧‧ second base

22‧‧‧Light wavelength conversion layer

23‧‧‧ first grassroots

24‧‧‧Second spacer

25‧‧‧First spacer

26‧‧‧Air gap

Claims (12)

A color wheel comprising a first base layer, a light wavelength conversion layer and a second base layer, which are sequentially stacked, wherein the color wheel further comprises a light wavelength conversion layer between the first base layer and the second base layer a spacer disposed in the same layer, the spacer having a thickness not less than a thickness of the light wavelength conversion layer, the two sides of the spacer being respectively adjacent to the first base layer and the second base layer. The color wheel of claim 1, wherein the spacer is a metal piece. The color wheel of claim 1, wherein the spacer has a thickness of 0.02 to 0.30 mm. The color wheel of claim 1, wherein the spacer has a thickness greater than a thickness of the light wavelength conversion layer, the light wavelength conversion layer being coupled to the first base layer or the second base layer, and converting at the wavelength of the light An air gap is formed between the layer and the second base layer or the first base layer. The color wheel of claim 1, wherein the two sides of the spacer are respectively adhered to the first base layer and the second base layer. The color wheel of claim 1, wherein the spacer comprises a first spacer located at a periphery of the optical wavelength conversion layer. The color wheel of claim 6, wherein the light wavelength conversion layer is annular, the spacer further comprises a second spacer at the center of the ring, the thickness of the first spacer and the second spacer equal. The color wheel of claim 6 or 7, wherein the first spacer is a ring piece or a ring piece having an opening or at least two pieces of the first piece. The color wheel of claim 8, wherein the annular piece, the annular piece or the first piece having the opening is provided with a first surface penetrating the first base layer and the second base layer. Small hole. The color wheel of claim 1, wherein the light wavelength conversion layer is annular, and the spacer comprises a second spacer located at the center of the ring. The color wheel according to Item 7 or 10, wherein the second spacer is a wafer, a wafer having a slit from a center, a ring, and a ring having a slit from a center. Or at least two second pieces. The method of assembling a color wheel according to any one of the items 1 to 11, comprising the steps of: a) bonding one side of the spacer to the first base layer; b) the light The wavelength conversion layer is adhered to the second base layer; c) the other side of the spacer is bonded to the second base layer, and the spacer is disposed in the same layer as the light wavelength conversion layer.