OPTICAL UNIT, METHOD FOR CONTROLLING DRIVE, AND HOLOGRAPHIC APPARATUS
PROBLEM TO BE SOLVED: To adapt an acousto-optic deflector (AOD) to be used as a shutter such as an acousto-optic modulator (AOM). SOLUTION: The characteristics of transmittance change with respect to frequencies of applied voltages on an acoustic optical medium in an AOD are shown in Fig.6. When the...
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| creator | OKADA HITOSHI SEKO SATORU |
| description | PROBLEM TO BE SOLVED: To adapt an acousto-optic deflector (AOD) to be used as a shutter such as an acousto-optic modulator (AOM). SOLUTION: The characteristics of transmittance change with respect to frequencies of applied voltages on an acoustic optical medium in an AOD are shown in Fig.6. When the element is used as a normal deflector, the frequency of the voltage applied is changed in a first frequency range (for example, a range corresponding from -V1 to V1) where the transmittance hardly changes. However, the frequency of the voltage applied is changed out of the first frequency range, but to a frequency in a second frequency range where the transmittance abruptly decreases (for example, a frequency corresponding to -V2 or V2, which minimizes the transmittance). Thus, the AOD is allowed to function as a shutter. COPYRIGHT: (C)2009,JPO&INPIT |
| format | Patent |
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SOLUTION: The characteristics of transmittance change with respect to frequencies of applied voltages on an acoustic optical medium in an AOD are shown in Fig.6. When the element is used as a normal deflector, the frequency of the voltage applied is changed in a first frequency range (for example, a range corresponding from -V1 to V1) where the transmittance hardly changes. However, the frequency of the voltage applied is changed out of the first frequency range, but to a frequency in a second frequency range where the transmittance abruptly decreases (for example, a frequency corresponding to -V2 or V2, which minimizes the transmittance). Thus, the AOD is allowed to function as a shutter. 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SOLUTION: The characteristics of transmittance change with respect to frequencies of applied voltages on an acoustic optical medium in an AOD are shown in Fig.6. When the element is used as a normal deflector, the frequency of the voltage applied is changed in a first frequency range (for example, a range corresponding from -V1 to V1) where the transmittance hardly changes. However, the frequency of the voltage applied is changed out of the first frequency range, but to a frequency in a second frequency range where the transmittance abruptly decreases (for example, a frequency corresponding to -V2 or V2, which minimizes the transmittance). Thus, the AOD is allowed to function as a shutter. 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SOLUTION: The characteristics of transmittance change with respect to frequencies of applied voltages on an acoustic optical medium in an AOD are shown in Fig.6. When the element is used as a normal deflector, the frequency of the voltage applied is changed in a first frequency range (for example, a range corresponding from -V1 to V1) where the transmittance hardly changes. However, the frequency of the voltage applied is changed out of the first frequency range, but to a frequency in a second frequency range where the transmittance abruptly decreases (for example, a frequency corresponding to -V2 or V2, which minimizes the transmittance). Thus, the AOD is allowed to function as a shutter. COPYRIGHT: (C)2009,JPO&INPIT</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHIC PROCESSES OR APPARATUS HOLOGRAPHY PHOTOGRAPHY PHYSICS |
| title | OPTICAL UNIT, METHOD FOR CONTROLLING DRIVE, AND HOLOGRAPHIC APPARATUS |
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