Optical scanning apparatus and devices including an optical scanning apparatus
First Claim
1. An optical apparatus comprising:
- scanning means for scanning light irradiated from a light source to an object to be scanned at predetermined scanning periods in a predetermined direction;
reference timing signal generating means for generating a reference timing signal upon receiving the light which has been scanned by the scanning means; and
control means for setting a driving timing for the light source based on the reference timing signal generated by the reference timing signal generating means, the optical apparatus further comprising memory means for storing a table comprising driving timing data for each of a plurality of corresponding periods of the reference timing signal, wherein the control means measures the period of the reference timing signal generated by the reference timing signal generating means, reads out from the table stored in said memory means the driving timing data corresponding to the measured period of the reference timing signal, and sets the driving timing in accordance with the read-out driving timing data.
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Abstract
The present invention has been made for the purpose of obtaining an optical apparatus which avoids the necessity for changing a control unit for appropriate control of a light source or making a modification to the control unit even when the type and specifications of the optical apparatus are changed, whereby costs for designing the control unit may be reduced. In the case where a comparative table stores therein LEND signal times and data starting times respectively corresponding SYNC signal periods of three apparatuses of different types, a CPU searches for a SYNC signal period coincident with the measured SYNC signal period from among the SYNC signal periods which are stored in the comparative table, and executes control of signals for an optical unit by using the obtained LEND signal time and data starting time corresponding to the searched SYNC signal period.
15 Citations
28 Claims
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1. An optical apparatus comprising:
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scanning means for scanning light irradiated from a light source to an object to be scanned at predetermined scanning periods in a predetermined direction;
reference timing signal generating means for generating a reference timing signal upon receiving the light which has been scanned by the scanning means; and
control means for setting a driving timing for the light source based on the reference timing signal generated by the reference timing signal generating means, the optical apparatus further comprising memory means for storing a table comprising driving timing data for each of a plurality of corresponding periods of the reference timing signal, wherein the control means measures the period of the reference timing signal generated by the reference timing signal generating means, reads out from the table stored in said memory means the driving timing data corresponding to the measured period of the reference timing signal, and sets the driving timing in accordance with the read-out driving timing data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
rectification means for rectifying an electric signal supplied from an alternating-current power source;
smoothing means for smoothing the electric signal rectified by the rectification means;
binarization means for binarizing the electric signal smoothened by the smoothing means;
delay means for delaying the electric signal binarized by the binarization means;
noise eliminating means for eliminating noise components of the electric signal delayed by the delay means and supplying the obtained electric signal to the light source and the scanning means;
electric signal generating means for generating an electric signal to be supplied to the control means, on the basis of the electric signal binarized by the binarization means; and
a condenser interposed between the electric signal generating means and the control means.
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8. The optical apparatus of claim 1, wherein said control means measures the period of the reference timing signal using a timer responsive to successive inputs of the reference timing signal.
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9. An optical apparatus comprising:
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scanning means for scanning light irradiated from a light source to an object to be scanned at predetermined scanning periods in a constant direction;
reference timing signal generating means for generating a reference timing signal upon receipt of the light scanned by the scanning means; and
control means for measuring a period of the reference timing signal generated by the reference timing signal generating means and setting a driving timing for the light source by calculation on the basis of a predetermined relationship between the period of the reference timing signal and the driving timing for the light source as well as of the measured period of the reference timing signal. - View Dependent Claims (10)
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11. An electrophotographic type printer comprising a photosensitive body and optical means for irradiating a surface of the photosensitive body with a laser beam modulated based on a signal showing an image to be printed, wherein the optical means includes:
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a light source for outputting the laser beam;
scanning means for scanning the laser beam toward the surface of the photosensitive body at predetermined scanning periods in a constant direction;
reference timing signal generating means for generating a reference timing signal upon receiving the light beam scanned by the scanning means;
memory means for storing a table comprising driving timing data for each of a plurality of corresponding periods of the reference timing signal; and
control means for measuring the period of the reference timing signal generated by the reference timing signal generating means, for reading out from the table stored in said memory means the driving timing data corresponding to the measured period of the reference timing signal, for setting the driving timing in accordance with the read-out driving timing data, and for controlling output and stoppage of the laser beam from the light source based on the set driving timing. - View Dependent Claims (12)
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13. An image irradiating apparatus comprising a screen which is irradiated with a laser beam to display an image and optical means for irradiating a surface of the screen with the laser beam modulated based on a signal showing the image to be displayed, wherein the optical means includes:
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a light source for outputting the laser beam;
scanning means for scanning the laser beam toward the screen in a specified direction at predetermined scanning periods in a constant direction;
reference timing signal generating means for generating a reference timing signal upon receipt of the laser beam scanned by the scanning means;
memory means for storing a table comprising driving timing data for each of a plurality of corresponding periods of the reference timing signal; and
control means for measuring the period of the reference timing signal generated by the reference timing signal generating means, reading out from the table stored in said memory means the driving timing data corresponding to the measured period of the reference timing signal, setting the driving timing in accordance with the read-out driving timing data, and controlling output and stoppage of the laser beam from the light source based on the set driving timing. - View Dependent Claims (14)
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15. An optical scanning apparatus comprising:
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a light source;
scanning circuitry for scanning light from said light source across a scanned object during a scan period;
a control circuit configured to set a timing for driving said light source, said control circuit being further configured to measure the scan period and to automatically set the timing for driving said light source in accordance with the measured scan period; and
a memory for storing a plurality of different scan periods each associated with a respective corresponding timing for driving said light source, wherein said control circuit is further configured to read out one of the timings from said memory based on the measured scan period and to set the timing for driving said light source using the read out timing. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. An optical scanning apparatus comprising:
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a light source;
scanning circuitry for scanning light from said light source across a scanned object during a scan period; and
a control circuit configured to set a timing for driving said light source, said control circuit being further configured to measure the scan period and to automatically set the timing for driving said light source in accordance with the measured scan period, wherein said control circuit is further configured to calculate a timing for driving said light source based on the measured scan period and to set the timing for driving said light source to the calculated timing. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification