CN107577109B - Optical device - Google Patents
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- CN107577109B CN107577109B CN201610522750.4A CN201610522750A CN107577109B CN 107577109 B CN107577109 B CN 107577109B CN 201610522750 A CN201610522750 A CN 201610522750A CN 107577109 B CN107577109 B CN 107577109B
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Abstract
An optical device includes a fluorescent wheel and two light sources. The fluorescent wheel has two fluorescent segments. The two fluorescent segments are located at different radial positions of the fluorescent wheel and do not overlap. Each fluorescent segment has a plurality of fluorescent color segments. The light source emits two light beams providing two spots on the fluorescent wheel, respectively. The two light spots are respectively positioned in the two fluorescent sections. During rotation of the fluorescent wheel, the two light spots are respectively located on fluorescent color segments having the same fluorescent characteristics in the two fluorescent sections.
Description
Technical Field
The present disclosure relates to optical devices, and particularly to a projector.
Background
In the prior art, a projector uses a laser (typically a blue laser) in combination with a fluorescent device to provide a light source. However, the long-term use of the fluorescent material is limited by the thermal decay effect of the fluorescent material, which causes the excitation efficiency of the fluorescent material to decrease. The situation of the fluorescent element excitation efficiency reduction is commonly found in a single-chip Digital Light Processing projector (DLP) or a three-chip Digital Light Processing projector (DLP). Therefore, improving the heat dissipation of the fluorescent element to improve the light emitting efficiency is a problem to be solved in solid state lighting.
Disclosure of Invention
In view of the above, an objective of the present invention is to provide an optical device capable of further improving the excitation efficiency of the fluorescent element while reducing the heat accumulation and avoiding the thermal decay effect of the fluorescent element.
To achieve the above objective, according to one embodiment of the present invention, an optical device includes a fluorescent wheel and two light sources. The fluorescent wheel has two fluorescent segments. The two fluorescent segments are located at different radial positions of the fluorescent wheel and do not overlap. Each fluorescent segment has a plurality of fluorescent color segments. The light source emits two light beams providing two spots on the fluorescent wheel, respectively. The two light spots are respectively positioned in the two fluorescent sections. During rotation of the fluorescent wheel, the two light spots are respectively located on fluorescent color segments having the same fluorescent characteristics in the two fluorescent sections.
In one or more embodiments of the present invention, the optical device further includes a color filter wheel. The color filter wheel is configured to receive light rays excited by the fluorescent segments.
In one or more embodiments of the present invention, the optical device further includes a light combining module. The light combining module is configured to receive the light rays excited by the fluorescent segment and further guide the excited light rays to the color filter wheel.
In one or more embodiments of the present invention, the optical device further includes an integrator. The integrator is configured to receive the light rays guided by the light combining module and to continuously guide the light rays out to the color filter wheel.
In one or more embodiments of the present invention, the optical apparatus further includes a first driver, a second driver and a synchronization circuit. The first driver is configured to drive the fluorescent wheel to rotate. The second driver is configured to drive the color filter wheel to rotate. The synchronous circuit is electrically connected with the first driver and the second driver. The color filter wheel has a plurality of color areas. The color zones respectively correspond to the fluorescence color sections of any fluorescence section. The synchronous circuit is configured to synchronously control the first driver and the second driver, so that during the rotation of the fluorescent wheel and the filter color wheel, the light rays excited by any one of the fluorescent color segments of the fluorescent section are irradiated to the corresponding one of the color zones of the filter color wheel.
In one or more embodiments of the present invention, the optical device further includes a brightness control circuit. The brightness control circuit is electrically connected with the light source and the synchronous circuit. The brightness control circuit is configured to control the output power of the light source, and during the rotation of the fluorescent wheel, the light source is irradiated with light rays with different output powers to those with different fluorescent characteristics in the fluorescent color segments in cooperation with the synchronization circuit.
In one or more embodiments of the present invention, the central angles of at least two fluorescence color segments having the same fluorescence characteristic in the fluorescence color segments of the two fluorescence segments are the same.
In one or more embodiments of the present invention, the central angles of at least two of the fluorescence color segments of each fluorescence segment having different fluorescence characteristics are the same.
In one or more embodiments of the present invention, the color filter wheel has a plurality of color regions. The color zones respectively correspond to the fluorescence color segments of the fluorescence segments.
In one or more embodiments of the present invention, the central angles of at least two fluorescence color segments with different fluorescence characteristics in the fluorescence color segment of each fluorescence segment are different. The central angles of at least two fluorescence color segments with the same fluorescence characteristics in the fluorescence color segments in the fluorescence section are the same.
In one or more embodiments of the present invention, the color filter wheel has a plurality of color regions. The color zones respectively correspond to the fluorescence color segments of the fluorescence segments. The central angles of any two color regions with different colors in the color regions are different.
In one or more embodiments of the present invention, the straight line connecting the two light spots passes through the center of the fluorescent wheel.
In one or more embodiments of the present invention, the fluorescent wheel further has two light-transmitting portions. The two light transmission parts are configured to allow the two light beams to pass through respectively. When one of the two light transmitting portions is moved to the first light spot by the rotation of the fluorescent wheel, the other of the two light transmitting portions is simultaneously positioned at the second light spot.
To achieve the above objects, according to another embodiment of the present invention, an optical device includes a fluorescent wheel, a first fluorescent color segment, a second fluorescent color segment, and two light sources. The fluorescent wheel has a radius. The first fluorescent color segment is located along a radius at a first radial location of the fluorescent wheel and forms a first central angle. The second fluorescent color segment is located along a second radius of the fluorescent wheel and forms a second central angle. The first fluorescent color section and the second fluorescent color section are coated with a first fluorescent material. The first central angle is the same as the second central angle. The two light sources form a light spot respectively and are used for exciting the first fluorescent materials on the first fluorescent color section and the second fluorescent color section. The time for exciting the first fluorescent material by the two light spots is substantially the same when the fluorescent wheel rotates.
In one or more embodiments of the present invention, the two light spots can simultaneously excite the first fluorescent material on the first fluorescent color segment and the second fluorescent color segment.
In one or more embodiments of the present invention, the optical device further includes a third fluorescent color segment and a fourth fluorescent color segment. The third fluorescent color segment is located along the radius at the first radial location of the fluorescent wheel and forms a third central angle. The fourth fluorescent color segment is located along the radius at the second radial location of the fluorescent wheel and forms a fourth central angle. And the third fluorescent color section and the fourth fluorescent color section are coated with a second fluorescent material. The third central angle is the same as the fourth central angle. When the fluorescent wheel rotates, the two light spots are suitable for exciting the second fluorescent materials on the third fluorescent color section and the fourth fluorescent color section in substantially the same time.
In one or more embodiments of the present invention, the two light spots can simultaneously excite the second fluorescent material on the third fluorescent color segment and the fourth fluorescent color segment.
In one or more embodiments of the present invention, the first fluorescent color segment and the fourth fluorescent color segment are simultaneously disposed in a sector area formed by a first central angle of the fluorescent wheel.
In one or more embodiments of the present invention, the optical device further includes two light-transmitting regions. The two light-transmitting areas are arranged on the fluorescent wheel and are arranged at intervals with the first fluorescent color section and the second fluorescent color section. When the fluorescent wheel rotates, the two light spots are enabled to pass through the two light-transmitting areas in substantially the same time.
In one or more embodiments of the present invention, the two light spots can simultaneously pass through the two transparent areas.
In one or more embodiments of the present invention, the optical device further includes a fifth fluorescent color segment and a sixth fluorescent color segment. The fifth fluorescent color section and the sixth fluorescent color section are arranged on the fluorescent wheel and are arranged at intervals with the first fluorescent color section and the second fluorescent color section. And the fifth fluorescent color section and the sixth fluorescent color section are coated with a third fluorescent material. The second light spot is adapted to excite the third fluorescent material in the fifth fluorescent color segment for substantially the same time as the third fluorescent material in the sixth fluorescent color segment is excited by the fluorescent wheel as it rotates.
In one or more embodiments of the present invention, the two light spots can simultaneously excite the third fluorescent material on the fifth fluorescent color segment and the sixth fluorescent color segment.
In summary, the optical device of the present invention separates the two light spots provided by the two light sources on the fluorescent wheel, so as to reduce the power of a single light spot (i.e. reduce the heat accumulation), thereby avoiding the thermal attenuation effect of the fluorescent material coated on the fluorescent wheel. In addition, in the optical device of the present invention, the fluorescent wheel has two fluorescent segments located at different radial positions, so that during the rotation of the fluorescent wheel, by respectively locating the two light spots on the two fluorescent color segments having the same fluorescent characteristic in the fluorescent segments, the brightness and the color saturation of the color corresponding to the fluorescent characteristic can be effectively improved. Furthermore, the optical device of the present invention can achieve the purpose of changing the color ratio and the color saturation by changing the central angle of the fluorescent color segment (i.e. changing the coating range of the fluorescent color segment). Alternatively, in order to achieve the above-mentioned purpose of changing the color ratio and the color saturation, the optical device of the present invention may further cooperate with the brightness control circuit through the synchronization circuit, so that the light source irradiates the fluorescent segments with different fluorescent characteristics with the light beams having different output powers, respectively.
The foregoing is merely illustrative of the problems, solutions to problems, and other aspects of the present invention, and the specific details thereof are set forth in the following description and the related drawings.
Drawings
In order to make the aforementioned and other objects, features, advantages and embodiments of the invention more comprehensible, the following description is given:
FIG. 1A is a schematic diagram illustrating an optical device according to an embodiment of the invention.
FIG. 1B is another schematic diagram of the optical device shown in FIG. 1A.
FIG. 2 is a circuit diagram of an optical device according to an embodiment of the invention.
FIG. 3 is a schematic view showing a fluorescence wheel according to an embodiment of the present invention.
FIG. 4A is a schematic diagram illustrating an optical device according to another embodiment of the present invention.
FIG. 4B is another schematic diagram of the optical device shown in FIG. 4A.
FIG. 5 is a schematic diagram illustrating an optical device according to another embodiment of the present invention.
Wherein the reference numerals are as follows:
100. 200 and 300: optical device
110. 110', 210, 310: fluorescent wheel
111: first fluorescent segment
112: second fluorescent segment
113: light penetration part
121: first light source
122: second light source
130. 230: color wheel with filter
140. 340, and (3): light-combining module
150: integrator
160: synchronous circuit
165: cooperative controller
170: brightness control circuit
180: first driver
190: second driver
341: dichroic mirror
342. 343, 344: reflecting mirror
α, α 1, α 2, β 1, β 2: centre angle
θ: angle of rotation
R1, R2, G1, G2, Yo1, Yo2, Yi1, Yi 2: fluorescent color segment
C1, C2, C3, C4: color zone
O: center of circle
P1: the first light spot
P2: second light spot
Rad: radius degree
Detailed Description
In the following description, for purposes of explanation, numerous implementation details are set forth in order to provide a thorough understanding of the various embodiments of the present invention. It should be understood, however, that these implementation details are not to be interpreted as limiting the invention. That is, in some embodiments of the invention, such implementation details are not necessary. In addition, some conventional structures and elements are shown in simplified schematic form in the drawings.
Please refer to fig. 1A and fig. 1B. Fig. 1A is a schematic diagram illustrating an optical device 100 according to an embodiment of the invention. FIG. 1B is another schematic diagram of the optical device 100 in FIG. 1A. As shown in fig. 1A and 1B, in the present embodiment, the optical device 100 includes a fluorescent wheel 110, a first light source 121, a second light source 122, a color filter wheel 130, a light combining module 140, and an integrator 150. The fluorescent wheel 110 has a first fluorescent segment 111 and a second fluorescent segment 112. The first fluorescent segment 111 and the second fluorescent segment 112 are located at different radial positions of the fluorescent wheel 110 and do not overlap. The radius position described herein is a position spaced apart from the center of the fluorescent wheel 110 by a predetermined radius. Specifically, the first fluorescent section 111 is located outside the second fluorescent section 112, i.e. the radius from the first radial position to the center of the fluorescent wheel 110 is greater than the radius from the second radial position to the center of the fluorescent wheel 110. The fluorescent wheel 110 has a radius (i.e., radian). The first fluorescent segment 111 has a plurality of fluorescent color segments R1, G1, Yo1 and Yo 2. The second fluorescent segment 112 has a plurality of fluorescent color segments R2, G2, Yi1, Yi 2. The first light source 121 and the second light source 122 emit two light beams to provide a first light point P1 and a second light point P2 on the fluorescent wheel 110, respectively. The first light point P1 and the second light point P2 are located in the first fluorescent section 111 and the second fluorescent section 112, respectively. By separating the first light spot P1 and the second light spot P2 provided by the first light source 121 and the second light source 122 on the fluorescent wheel 110, the power of a single light spot can be reduced (i.e. the heat accumulation is reduced), thereby preventing the fluorescent material coated on the fluorescent wheel 110 from thermal decay.
In the present embodiment, the first light source 121 and the second light source 122 are blue laser solid-state light sources. The fluorescent wheel 110 is a transmissive substrate and has two light transmissive portions 113. The fluorescent color segments R1 and R2 are coated with the first fluorescent material, so that they have the same fluorescent characteristics, and can be excited by the light emitted by the first light source 121 and the second light source 122 respectively to generate the first light beam and the second light beam with the first specific wavelength, which can become the red light source after passing through the corresponding color region (e.g. color region C1) of the color filter wheel 130. The fluorescent color segments G1 and G2 are coated with the second fluorescent material, so that they have the same fluorescent characteristics, and can be excited by the light emitted by the first light source 121 and the second light source 122 respectively to generate the third light beam and the fourth light beam with the second specific wavelength, which can become the green light source after passing through the corresponding color region (e.g. color region C2) of the color filter wheel 130. The fluorescent color segments Yo1, Yo2 and the fluorescent color segments Yi1, Yi2 are coated with a third fluorescent material, so that they have the same fluorescent characteristics, and can be excited by the light emitted from the first light source 121 and the second light source 122, respectively, to generate fifth, sixth, seventh and eighth light beams having a third specific wavelength, which can become a yellow light source after passing through the corresponding color region (e.g., color region C3) of the color filter wheel 130. After the light beams of the first light source 121 and the second light source 122 pass through the light transmitting portion 113 and pass through the corresponding color region (e.g., the color region C4) of the color filter wheel 130, they become a blue light source.
In some embodiments, the material of the light transmitting portion 113 may include transparent glass, but the invention is not limited thereto. In other embodiments, the light transmitting portion 113 may also be a notch.
In some embodiments, the fluorescent wheel 110 may not have the light penetration portion 113. That is, the fluorescent segments on the fluorescent wheel 110 may be connected to form a continuous full circle.
In particular, the optical device 100 of the present embodiment is configured such that the first light spot P1 and the second light spot P2 are located on the fluorescent color segments of the first fluorescent section 111 and the second fluorescent section 112 having the same fluorescent characteristics during the rotation of the fluorescent wheel 110. For example, when the first light point P1 is located in the fluorescent color segment R1 of the first fluorescent segment 111, the second light point P2 is located in the fluorescent color segment R2 of the second fluorescent segment 112; when the fluorescent color segment G1 of the first fluorescent segment 111 is moved to the first light point P1 by the rotation of the fluorescent wheel 110, the fluorescent color segment G2 of the second fluorescent segment 112 is located at the second light point P2 by the rotation of the fluorescent wheel 110; when the fluorescent color segment Yo1 of the first fluorescent segment 111 is moved to the first light point P1 by the rotation of the fluorescent wheel 110, the fluorescent color segment Yi2 of the second fluorescent segment 112 is located at the second light point P2 by the rotation of the fluorescent wheel 110; when the fluorescent color segment Yo2 of the first fluorescent segment 111 is moved to the first light point P1 by the rotation of the fluorescent wheel 110, the fluorescent color segment Yi1 of the second fluorescent segment 112 is located at the second light point P2 by the rotation of the fluorescent wheel 110. When one light transmission part 113 moves to the first light point P1 by the rotation of the fluorescent wheel 110, the other light transmission part 113 is also located at the second light point P2 by the rotation of the fluorescent wheel 110.
As also shown in fig. 1A and 1B, the positions of the first light source 121 and the second light source 122 and the position of the color filter wheel 130 are respectively located on two opposite sides of the fluorescent wheel 110, so that the light rays passing through the first fluorescent section 111 and the second fluorescent section 112 are then irradiated to the color filter wheel 130. The light combining module 140 is located between the fluorescent wheel 110 and the filtering color wheel 130. The light combining module 140 is configured to receive the light rays passing through the first fluorescent section 111 and the second fluorescent section 112 and further guide the light rays to the color filter wheel 130. The integrator 150 is located between the light combining module 140 and the color filter wheel 130. The integrator 150 is configured to receive the two light beams guided by the light combining module 140 and uniformly mix the two light beams into one light beam, and then further guide the mixed light beam to the color filter wheel 130. In practical applications, the optical path structure of the light combining module 140 is not limited to the embodiment shown in fig. 1A.
Fig. 2 is a circuit diagram of an optical device 100 according to an embodiment of the invention. As shown in fig. 2, in the present embodiment, the optical device 100 further includes a first driver 180, a second driver 190 and a synchronization circuit 160. The first driver 180 is configured to drive the fluorescent wheel 110 to rotate. The second driver 190 is configured to drive the color filter wheel 130 to rotate. The synchronization circuit 160 is electrically connected to the first driver 180 and the second driver 190. The color filter wheel 130 has a plurality of color regions C1, C2, C3, C4. The color regions C1, C2 and C3 correspond to the fluorescent color segments R1, G1 and Yo1, Yo2 of the first fluorescent segment 111, respectively, and the fluorescent color segments R2, G2 and Yi1, Yi2 of the second fluorescent segment 112, respectively. The synchronization circuit 160 is configured to synchronously control the first driver 180 and the second driver 190, so that during the rotation of the fluorescent wheel 110 and the filter color wheel 130, the light rays passed by any one of the fluorescent color segments of the fluorescent segment then irradiate to a corresponding one of the color zones of the filter color wheel 130. For example, the light transmitted by the color region C1 has a specific red spectrum, and the first and second light beams passing through the fluorescent color segments R1, R2 can just reach the color region C1 under the control of the synchronization circuit 160; the light transmitted by the color region C2 has a specific green spectrum, and the third and fourth light beams passing through the fluorescent color segments G1, G2 can just reach the color region C2 under the control of the synchronization circuit 160; the light transmitted by the color region C3 has a specific yellow spectrum, and the fifth, sixth, seventh and eighth light beams passing through the fluorescent color segments Yo1, Yo2, Yi1 and Yi2 can just reach the color region C3 under the control of the synchronization circuit 160; the light transmitted by the color region C4 has a specific blue spectrum, and the light transmitted by the light transmitting portion 113 can just reach the color region C4 under the control of the synchronization circuit 160.
Under the above structure and light path configuration, the brightness and color saturation of the color corresponding to each fluorescence characteristic can be effectively improved. After the experiments of the applicant, it is found that the optical device 100 employing the fluorescent wheel 110 having two fluorescent segments can effectively increase the brightness and the color saturation of a specific color compared to the conventional optical device 100 employing the fluorescent wheel 110 having only a single fluorescent segment. From specific experimental data, the red light can improve the overall brightness by about 1-1.5%, and the color ratio (color ratio) of the red light to the white light can also be improved from 6.6% to 7.3%, while the green light can improve the overall brightness by about 4-5%.
In some embodiments, the light emitted by the first light source 121 and the light emitted by the second light source 122 have the same wavelength. In some embodiments, the light emitted by the first light source 121 and the light emitted by the second light source 122 have different wavelengths.
Referring back to FIG. 1A, in the present embodiment, the straight line connecting the first light spot P1 and the second light spot P2 passes through the center O of the fluorescent wheel 110, but the invention is not limited thereto. FIG. 3 is a schematic diagram of a fluorescence wheel 110' according to an embodiment of the invention. As shown in fig. 3, the difference between the fluorescent wheel 110 'of this embodiment and the fluorescent wheel 110 shown in fig. 1A is that the connection between the first light spot P1 and the second light spot P2 does not pass through the center O of the fluorescent wheel 110' of this embodiment. Specifically, in the present embodiment, all the fluorescent color segments of the second fluorescent section 112 and the second light spot P2 are clockwise deflected by an angle θ relative to the center O. Thus, during rotation of the fluorescent wheel 110', the positions of the first light point P1 and the second light point P2 can be located on the fluorescent color segments of the first fluorescent segment 111 and the second fluorescent segment 112, respectively, having the same fluorescent characteristics.
Referring back to fig. 1A, in the present embodiment, the central angles of at least two fluorescence color segments with different fluorescence characteristics in the fluorescence color segments of each fluorescence segment are the same. For example, the fluorescent color segment R1 in the first fluorescent segment 111 has the same central angle α as the fluorescent color segment G1, and the fluorescent color segment R2 in the second fluorescent segment 112 has the same central angle α as the fluorescent color segment G2. And the central angles of at least two fluorescence color segments with the same fluorescence characteristics in the fluorescence color segments in the fluorescence section are the same. For example, the fluorescent color segment R1 in the first fluorescent segment 111 has the same central angle α as the fluorescent color segment R2 in the second fluorescent segment 112, and the fluorescent color segment G1 in the first fluorescent segment 111 has the same central angle α as the fluorescent color segment G2 in the second fluorescent segment 112. And, the central angles of at least two color regions having different colors among the color regions of the color filter wheel 130 are the same. For example, color zone C1 has the same central angle β as color zone C2. However, the invention is not limited thereto.
Please refer to fig. 4A and fig. 4B. Fig. 4A is a schematic diagram illustrating an optical device 200 according to another embodiment of the invention. FIG. 4B is another schematic diagram of the optical device 200 shown in FIG. 4A. As shown in fig. 4A and 4B, in the present embodiment, the optical device 200 also includes a fluorescent wheel 210, a first light source 121, a second light source 122, a color filter wheel 230, a light combining module 140 and an integrator 150, wherein the first light source 121, the second light source 122, the light combining module 140 and the integrator 150 are all the same as the embodiment shown in fig. 1A, and therefore, reference is made to the related description, which is not repeated herein. It should be noted that the difference between the present embodiment and the embodiment shown in fig. 1A is that the optical device 200 of the present embodiment adjusts the fluorescent color segment of the fluorescent segment on the fluorescent wheel 210, and the color region on the filter color wheel 230 is adjusted accordingly.
Specifically, in the present embodiment, the central angles of at least two fluorescence color segments with different fluorescence characteristics in the fluorescence color segment of each fluorescence segment are different. For example, in the first fluorescent segment 111, the central angle α 1 of the fluorescent color segment R1 is different from the central angle α 2 of the fluorescent color segment G1. In the second fluorescent segment 112, the central angle α 1 of the fluorescent color segment R2 is different from the central angle α 2 of the fluorescent color segment G2. And the central angles of at least two fluorescence color segments with the same fluorescence characteristics in the fluorescence color segments in the fluorescence section are the same. For example, the fluorescent color segment R1 in the first fluorescent segment 111 has the same central angle α 1 as the fluorescent color segment R2 in the second fluorescent segment 112, and the fluorescent color segment G1 in the first fluorescent segment 111 has the same central angle α 2 as the fluorescent color segment G2 in the second fluorescent segment 112. And, the central angles of at least two color regions having different colors among the color regions of the color filter wheel 230 are different. For example, the central angle β 1 of the color zone C1 is different from the central angle β 2 of the color zone C2.
By changing the central angle of the fluorescent color segment (i.e. changing the coating range of the fluorescent color segment), the objective of changing the color ratio and color saturation can be effectively achieved. For example, as shown in fig. 4A, since the central angles α 1 of the fluorescent color segments R1 and R2 are greater than the central angles α 2 of the fluorescent color segments G1 and G2, and the central angle β 1 of the color region C1 is correspondingly greater than the central angle β 2 of the color region C2, the ratio of red light and the color saturation can be increased.
Alternatively, to achieve the above-mentioned purpose of changing the color ratio and the color saturation, in one embodiment, the optical device 100 may further include a cooperative controller 165 and a brightness control circuit 170. The brightness control circuit 170 is configured to control the output power of the light emitted by the first light source 121 and the second light source 122. The synchronization circuit 160 and the brightness control circuit 170 cooperate with each other through the cooperation controller 165 shown in fig. 2, so that the first light source 121 and the second light source 122 respectively irradiate the fluorescent color segments with different fluorescent characteristics with light beams having different output powers. For example, when the fluorescent color segment R1 of the first fluorescent segment 111 and the fluorescent color segment R2 of the second fluorescent segment 112 move to the positions of the first light spot P1 and the second light spot P2 respectively by the rotation of the fluorescent wheel 110, the synchronization circuit 160 and the brightness control circuit 170 can cooperate with each other by the cooperation controller 165, so that the first light source 121 and the second light source 122 emit light with the first output power; when the fluorescent color segment G1 of the first fluorescent segment 111 and the fluorescent color segment G2 of the second fluorescent segment 112 move to the positions of the first light point P1 and the second light point P2 respectively by the rotation of the fluorescent wheel 110, the synchronization circuit 160 and the brightness control circuit 170 can cooperate with each other by the cooperation controller 165, so that the first light source 121 and the second light source 122 emit light with the second output power. If the first output power is larger than the second output power, the proportion of red light and the color saturation can be increased. On the contrary, if the second output power is larger than the first output power, the proportion of green light and the color saturation can be increased.
In other words, as can be seen from the foregoing embodiments, the optical devices 100 and 200 include a fluorescent wheel, a first fluorescent color segment (e.g., the fluorescent color segment R1), a second fluorescent color segment (e.g., the fluorescent color segment R2), and two light sources (i.e., the first light source 121 and the second light source 122). The fluorescent wheel has a radial radius (as shown in FIGS. 1A and 4A). The first fluorescent color segment is disposed along a radius, Rad, at a first radial location of the fluorescent wheel and forms a first central angle (shown as central angle α in FIG. 1A and central angle α 1 in FIG. 4A). The second fluorescent color segment is disposed along the radius Rad at a second radial location of the fluorescent wheel and forms a second central angle (shown as central angle α in FIG. 1A and central angle α 1 in FIG. 4A). The first fluorescent color section and the second fluorescent color section are coated with a first fluorescent material. The first central angle is the same as the second central angle. The radius from the first radius position to the center of the fluorescent wheel 110 is not equal to the radius from the second radius position to the center of the fluorescent wheel 110. The two light sources form light spots (i.e., a first light spot P1 and a second light spot P2) and are used for exciting the first fluorescent material on the first fluorescent color segment and the second fluorescent color segment, respectively. The time for which the two spots are adapted (i.e. exactly) to excite the first fluorescent material is substantially the same when the fluorescent wheel is rotated. In some embodiments, the two light spots can simultaneously excite the first fluorescent material on the first fluorescent color segment and the second fluorescent color segment.
The optical devices 100 and 200 further include a third fluorescent color segment (e.g., fluorescent color segment G1) and a fourth fluorescent color segment (e.g., fluorescent color segment G2). The third fluorescent color segment is disposed along a radius Rad at the first radial location of the fluorescent wheel and forms a third central angle (shown as central angle α in FIG. 1A and central angle α 2 in FIG. 4A). The fourth fluorescent color segment is disposed along the radius Rad at a second radial location of the fluorescent wheel and forms a fourth central angle (shown as central angle α in FIG. 1A and central angle α 2 in FIG. 4A). And the third fluorescent color section and the fourth fluorescent color section are coated with a second fluorescent material. The third central angle is the same as the fourth central angle. The radius from the first radius position to the center of the fluorescent wheel 110 is not equal to the radius from the second radius position to the center of the fluorescent wheel 110. When the fluorescent wheel rotates, the two light spots are suitable for exciting the second fluorescent materials on the third fluorescent color section and the fourth fluorescent color section in substantially the same time. In some embodiments, the two light spots can simultaneously excite the second fluorescent material on the third fluorescent color segment and the fourth fluorescent color segment. In some embodiments, the first fluorescent color segment and the fourth fluorescent color segment are simultaneously disposed in a sector area formed by a first central angle of the fluorescent wheel.
The optical device 100, 200 further includes two light-transmitting regions (i.e., light-transmitting portions 113). The two light transmission parts are arranged on the fluorescent wheel and are arranged at intervals with the first fluorescent color section and the second fluorescent color section. When the fluorescent wheel rotates, the two light spots are enabled to pass through the two light-transmitting areas in substantially the same time. In some embodiments, two light spots can pass through two transmissive regions simultaneously.
The optical devices 100 and 200 further include a fifth fluorescent color segment (e.g., the fluorescent color segment Yo2) and a sixth fluorescent color segment (e.g., the fluorescent color segment Yi 1). The fifth fluorescent color section and the sixth fluorescent color section are arranged on the fluorescent wheel and are arranged at intervals with the first fluorescent color section and the second fluorescent color section. And the fifth fluorescent color section and the sixth fluorescent color section are coated with a third fluorescent material. The second light spot is adapted to excite the third fluorescent material in the fifth fluorescent color segment for substantially the same time as the third fluorescent material in the sixth fluorescent color segment is excited by the fluorescent wheel as it rotates. In some embodiments, the two light spots can simultaneously excite the third fluorescent material on the fifth fluorescent color segment and the sixth fluorescent color segment.
Fig. 5 is a schematic diagram illustrating an optical device according to another embodiment of the present invention. As shown in fig. 5, in the present embodiment, the optical device 300 includes a fluorescent wheel 310, a first light source 121, a second light source 122, a filtering color wheel 130, a light combining module 340 and an integrator 150, wherein the first light source 121, the second light source 122, the filtering color wheel 130 and the integrator 150 are all the same as the embodiment shown in fig. 1A, and therefore, the foregoing description is referred to and is not repeated herein. Note that the present embodiment is different from the embodiment shown in fig. 1A in that the optical device 300 of the present embodiment is modified with respect to the fluorescent wheel 310 and the light combining module 340.
Specifically, in the present embodiment, the fluorescent wheel 310 is a transflective substrate having the same configuration of the first fluorescent segment 111, the second fluorescent segment 112 and the light penetration portion 113 as shown on the fluorescent wheel 110 in fig. 1A, and the difference is that the first fluorescent segment 111 and the second fluorescent segment 112 on the fluorescent wheel 110 in fig. 1A are transmissive, and the first fluorescent segment 111 and the second fluorescent segment 112 on the fluorescent wheel 310 in the present embodiment are reflective. The light combining module 340 includes a dichroic mirror 341 and reflecting mirrors 342, 343, 344. The dichroic mirror 341 is configured to allow the light emitted from the first light source 121 and the second light source 122 to pass through and reflect the light with other wavelengths, so that the light emitted from the first light source 121 and the second light source 122 can directly pass through the dichroic mirror 341 and reach the fluorescent wheel 310.
Based on the optical path configuration shown in fig. 5, the fluorescent color segments R1 and R2 on the fluorescent wheel 310 can be excited by the light emitted by the first light source 121 and the second light source 122 respectively to generate the first light beam and the second light beam with the first specific wavelength, the first light beam and the second light beam are then reflected by the fluorescent color segments R1 and R2 respectively to the dichroic mirror 341, and then reflected by the dichroic mirror 341 to enter the integrator 150, and finally penetrate through the corresponding color region (e.g., color region C1) of the color filter wheel 130 to become the red light source. The fluorescent color segments G1 and G2 on the fluorescent wheel 310 can be excited by the light emitted by the first light source 121 and the second light source 122 respectively to generate third and fourth light beams with a second specific wavelength, which are then reflected by the fluorescent color segments G1 and G2 to the dichroic mirror 341, then reflected by the dichroic mirror 341 to enter the integrator 150, and finally pass through the corresponding color region (e.g., color region C2) of the color filter wheel 130 to become a green light source. The fluorescent segments Yo1, Yo2 and the fluorescent segments Yi1 and Yi2 on the fluorescent wheel 310 can be excited by the light emitted by the first light source 121 and the second light source 122, respectively, to generate fifth, sixth, seventh and eighth light beams with a third specific wavelength, which are then reflected by the fluorescent segments Yo1, Yo2 and the fluorescent segments Yi1, Yi2 to the dichroic mirror 341, then reflected by the dichroic mirror 341 to enter the integrator 150, and finally pass through the corresponding color region (e.g., color region C3) of the color filter wheel 130 to become a yellow light source. After the light beams of the first light source 121 and the second light source 122 pass through the light transmitting portion 113, the light beams are sequentially reflected by the reflectors 342, 343, 344 and enter the integrator 150, and finally pass through the corresponding color region (e.g., the color region C4) of the color filter wheel 130 to become a blue light source.
As is apparent from the above detailed description of the embodiments of the present invention, the optical device of the present invention can reduce the power of a single light spot (i.e. reduce the heat accumulation) by separating the two light spots provided by the two light sources on the fluorescent wheel, thereby avoiding the thermal attenuation effect of the fluorescent material coated on the fluorescent wheel. In addition, in the optical device of the present invention, the fluorescent wheel has two fluorescent segments located at different radial positions, so that during the rotation of the fluorescent wheel, by respectively locating the two light spots on the two fluorescent color segments having the same fluorescent characteristic in the fluorescent segments, the brightness and the color saturation of the color corresponding to the fluorescent characteristic can be effectively improved. Furthermore, the optical device of the present invention can achieve the purpose of changing the color ratio and the color saturation by changing the central angle of the fluorescent color segment (i.e. changing the coating range of the fluorescent color segment). Alternatively, in order to achieve the above-mentioned purpose of changing the color ratio and the color saturation, the optical device of the present invention may further cooperate with the brightness control circuit through the synchronization circuit, so that the light source irradiates the fluorescent segments with different fluorescent characteristics with the light beams having different output powers, respectively.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (19)
1. An optical device, comprising:
the fluorescent wheel is provided with two fluorescent sections, the two fluorescent sections are positioned at different radius positions of the fluorescent wheel and are not overlapped, and each fluorescent section is provided with a plurality of fluorescent color sections; and
two light sources emitting two light beams to provide two light spots on the fluorescent wheel, the two light spots are respectively located on the two fluorescent sections,
wherein during the rotation of the fluorescent wheel, the two light spots are respectively located on the fluorescent color segments with the same fluorescent characteristic in the two fluorescent sections;
the optical device further includes:
a color filter wheel configured to receive light rays excited by the fluorescent segments;
a first driver configured to drive the fluorescent wheel to rotate;
a second driver configured to drive the color wheel to rotate; and
a synchronization circuit electrically connected to the first driver and the second driver, the color filter wheel having a plurality of color areas, the color areas corresponding to the fluorescent color segments of any of the fluorescent segments, the synchronization circuit configured to synchronously control the first driver and the second driver such that during rotation of the fluorescent wheel and the color filter wheel, light rays excited by any of the fluorescent color segments of the fluorescent segments are then irradiated to a corresponding color area of the color filter wheel;
and the light combining module is configured to receive the light rays excited by the fluorescent sections and continuously guide the excited light rays to the filtering color wheel.
2. The optical apparatus of claim 1, further comprising an integrator configured to receive the light beams guided by the light combining module and further guide the light beams to the color filter wheel.
3. The optical device according to claim 1, further comprising a brightness control circuit electrically connected to the light sources and the synchronization circuit, the brightness control circuit being configured to control output powers of the light sources, and cooperate with the synchronization circuit to enable the light sources to irradiate the fluorescent segments with lights having different output powers to the fluorescent segments having different fluorescent characteristics during rotation of the fluorescent wheel.
4. The optical device according to any one of claims 1 to 3, wherein the central angles of at least two of the fluorescent color segments of the two fluorescent sections having the same fluorescent characteristic are the same.
5. The optical device according to claim 4, wherein the central angles of at least two of the fluorescent color segments of each fluorescent segment having different fluorescent characteristics are the same.
6. The optical apparatus according to claim 4, wherein the color filter wheel has a plurality of color regions respectively corresponding to the fluorescent color segments of the fluorescent segments, and the central angles of at least two of the color regions having different colors are the same.
7. The optical device according to claim 4, wherein the central angles of at least two of the fluorescent color segments of each fluorescent segment having different fluorescent characteristics are different.
8. The optical apparatus of claim 7, wherein the color filter wheel has a plurality of color regions corresponding to the fluorescent color segments of the fluorescent segments respectively, and the central angles of at least two of the color regions having different colors are different.
9. The optical device of claim 1, wherein a line connecting the two light spots passes through the center of the fluorescent wheel.
10. The optical apparatus of claim 1, wherein the fluorescent wheel further has two light-transmitting portions configured to allow the two light beams to pass through, respectively, and when one of the two light-transmitting portions is moved to the first light spot by the rotation of the fluorescent wheel, the other of the two light-transmitting portions is located at the second light spot at the same time.
11. An optical device, comprising:
a fluorescent wheel having a radius;
a first phosphor segment located along the radius at a first radial location of the phosphor wheel and forming a first central angle;
a second phosphor segment located along the radius at a second radial location of the phosphor wheel and forming a second central angle, wherein the first phosphor segment and the second phosphor segment are coated with a first phosphor material and the first central angle is the same as the second central angle; and
two light sources, which respectively form a light spot and are used for exciting the first fluorescent material on the first fluorescent color section and the second fluorescent color section, and when the fluorescent wheel rotates, the time for exciting the first fluorescent material by the two light spots is the same;
a color filter wheel configured to receive light rays excited by the fluorescent color segments;
and the light combining module is configured to receive the light rays excited by the fluorescent color segment and continuously guide the excited light rays to the filtering color wheel.
12. The optical device of claim 11, wherein the two light spots can simultaneously excite the first fluorescent material on the first fluorescent color segment and the second fluorescent color segment.
13. The optical device of claim 11, wherein the optical device further comprises:
a third phosphor segment located along the radius at the first radius of the phosphor wheel and forming a third central angle; and
a fourth fluorescent color segment located along the radius at the second radial location of the fluorescent wheel and forming a fourth central angle, wherein the third and fourth fluorescent color segments are coated with a second fluorescent material and the third and fourth central angles are the same;
when the fluorescent wheel rotates, the time for exciting the second fluorescent material on the third fluorescent color section and the fourth fluorescent color section by the two light spots is the same.
14. The optical device of claim 13, wherein the two light spots can simultaneously excite the second fluorescent material on the third fluorescent color segment and the fourth fluorescent color segment.
15. The optical device of claim 13, wherein the first fluorescent color segment and the fourth fluorescent color segment are simultaneously disposed in a sector area formed by the first central angle of the fluorescent wheel.
16. The optical device of claim 11, further comprising two transparent regions disposed on the fluorescent wheel and spaced apart from the first fluorescent segment and the second fluorescent segment, wherein the two light spots pass through the two transparent regions at the same time when the fluorescent wheel rotates.
17. The optical device of claim 16, wherein two of said light spots can pass through said two transparent regions simultaneously.
18. The optical device of claim 11, further comprising a fifth fluorescent color segment and a sixth fluorescent color segment disposed on the fluorescent wheel and spaced apart from the first fluorescent color segment and the second fluorescent color segment, wherein the fifth fluorescent color segment and the sixth fluorescent color segment are coated with a third fluorescent material, and when the fluorescent wheel rotates, the light spots excite the third fluorescent material in the fifth fluorescent color segment and the sixth fluorescent color segment at the same time.
19. The optical device of claim 18, wherein the light spots excite the third fluorescent material on the fifth fluorescent color segment and the sixth fluorescent color segment simultaneously.
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| CN106353959B (en) * | 2016-11-24 | 2018-04-24 | 广景视睿科技（深圳）有限公司 | A kind of colour wheel and its laser source system |
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