Optical read-write system with electronically variable image size
First Claim
1. An optical read-write system for scanning an object and reproducing an image which may vary in size from said object comprising:
- first laser means for linearly scanning an object at a scan rate and a photo multiplier tube for generating an electrical image signal for each scan,means for generating a read clock signal having a read frequency and generating a write clock signal having a write frequency, said means for generating a read clock signal and a write clock signal includinga source of a reference signal,a phase comparator for receiving said reference signal and a feedback signal and producing a control voltage based on a comparison of said reference signal and said feedback signal,a voltage controlled oscillator having a control terminal, means connecting said control voltage from said phase comparator to said control terminal whereby said oscillator generates a pulse signal at a frequency dependent on said control voltage,pulse removal means connected to receive said oscillator signal and controllable to produce an output signal in which a variable number of pulses of said oscillator signal may be removed,frequency divider means connected to receive said output signal from said pulse removal means and produce a divider output signal at a frequency lower than said oscillator signal frequency,means for applying said divider output signal to said phase comparator as said feedback signal, said write clock signal being derived from said oscillator signal and said read clock signal being derived from said output signal produced by said pulse removal means,means for storing said electrical image signal at said read frequency in synchronization with the scan of said means for optically scanning, andsecond laser means for receiving said stored electrical image signal and linearly scanning at said scan rate for displaying an image at said write frequency.
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Accused Products
Abstract
Disclosed is an optical read-write system including a first laser scanner for linearly scanning an object and generating a digital signal for the line scan. The digital signal is stored in a buffer at a read clock rate which is correlated to the scan of the first laser scanner. The digital signal is read-out of the buffer at a write clock rate and is applied as a control signal for a second laser scanner which linearly scans an image plane to develop an image. The second scanner scans at the same scan rate and distance as the first scanner, and the size of the image compared to the object size is determined by the differential of the read clock rate and the write clock rate.
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Citations
13 Claims
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1. An optical read-write system for scanning an object and reproducing an image which may vary in size from said object comprising:
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first laser means for linearly scanning an object at a scan rate and a photo multiplier tube for generating an electrical image signal for each scan, means for generating a read clock signal having a read frequency and generating a write clock signal having a write frequency, said means for generating a read clock signal and a write clock signal including a source of a reference signal, a phase comparator for receiving said reference signal and a feedback signal and producing a control voltage based on a comparison of said reference signal and said feedback signal, a voltage controlled oscillator having a control terminal, means connecting said control voltage from said phase comparator to said control terminal whereby said oscillator generates a pulse signal at a frequency dependent on said control voltage, pulse removal means connected to receive said oscillator signal and controllable to produce an output signal in which a variable number of pulses of said oscillator signal may be removed, frequency divider means connected to receive said output signal from said pulse removal means and produce a divider output signal at a frequency lower than said oscillator signal frequency, means for applying said divider output signal to said phase comparator as said feedback signal, said write clock signal being derived from said oscillator signal and said read clock signal being derived from said output signal produced by said pulse removal means, means for storing said electrical image signal at said read frequency in synchronization with the scan of said means for optically scanning, and second laser means for receiving said stored electrical image signal and linearly scanning at said scan rate for displaying an image at said write frequency. - View Dependent Claims (2, 3, 4)
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5. An optical read-write system for scanning an object and reproducing an image which may vary in size from said object comprising:
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first means for optically scanning an object and generating an electrical image signal for each scan, means for generating a read clock signal having a read frequency and generating a write clock signal having a write frequency, said means for generating a read clock signal and a write clock signal including a source of a reference signal, a phase comparator for receiving said reference signal and a feedback signal and producing a control voltage based on a comparison of said reference signal and said feedback signal, a voltage controlled oscillator having a control terminal, means connecting said control voltage from said phase comparator to said control terminal whereby said oscillator generates a signal at a frequency dependent on said control voltage, pulse removal means connected to receive said oscillator signal and controllable to produce an output signal in which a variable number of pulses of said oscillator signal may be removed, frequency divider means connected to receive said output signal from said pulse removal means and produce a divider output signal at a frequency lower than said oscillator signal frequency, means for applying said divider output signal to said phase comparator as said feedback signal, said write clock signal being derived from said oscillator signal and said read clock signal being derived from said output signal produced by said pulse removal means, means for storing said electrical image signal at said read frequency in synchronization with the scan of said means for optically scanning, and scanning means for receiving said stored electrical image signal and displaying an image at said write frequency. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13)
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Specification