Method for controlling operation of optical systems and devices
First Claim
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1. A method to control the operation of an optical system comprising:
- a. impinging visible light upon a spatial light modulator in said optical system from a visible light source;
b. providing at least two light-sensitive devices with outputs as part of said devices, wherein in at least one of said light-sensitive devices is more sensitive to said visible light than other of said devices;
c. inputting at least two said light-sensitive device outputs to a logic device; and
d. selectively inhibiting a signal essential for operation of said spatial light modulator in response to the output of said logic device.
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Abstract
The invention described herein details a method to control the operating window of illumination for an optical device or system. By connecting together two light sensitive devices (46a and 46b), one very sensitive to light (46a), the other mildly sensitive to light (46b), it is possible to designate when essential signals (38) are allowed to pass to a device or system. The outputs of the two devices are fed through logic circuitry (52 and 54) which determines the output. The logic circuitry is selected dependent upon which operation window is chosen. The output of the logic is then connected to the control signal.
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7 Claims
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1. A method to control the operation of an optical system comprising:
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a. impinging visible light upon a spatial light modulator in said optical system from a visible light source; b. providing at least two light-sensitive devices with outputs as part of said devices, wherein in at least one of said light-sensitive devices is more sensitive to said visible light than other of said devices; c. inputting at least two said light-sensitive device outputs to a logic device; and d. selectively inhibiting a signal essential for operation of said spatial light modulator in response to the output of said logic device. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system to control the operation of an optical system comprising:
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a. a visible light source for illuminating said optical system; b. a spatial light modulator for receiving said visible light; c. at least two light-sensitive devices adjacent said spatial light modulator, wherein at least one of said light-sensitive devices is more sensitive to light from said source than others of said devices; d. a logic device connected to at least two of said light-sensitive devices; e. circuitry connected to the output of said logic device for selectively inhibiting a signal essential for operation of said spatial light modulator as to when it can pass to said optical system.
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Specification