Ambient light detector, laser lighting control device using the same suitable for bar code reader, and bar code reader
First Claim
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1. An ambient light detector comprising:
- ambient light detecting means for detecting an ambient light around a device; and
judging means for providing a signal indicating that the ambient light detected by said ambient light detecting means has exceeded a predetermined value for at least predetermined time,said ambient light detecting means including light detection/conversion means for detecting an ambient light around a device to convert the ambient light into an electrical signal, and amplifying means for amplifying the electrical signal from said light detection/conversion means,said judging means including integrating means for integrating a signal from said amplifying means based on a predetermined time constant comparison reference information producing means for producing comparison reference information following a change in said ambient light, in response to the signal from said integrating means, and comparing means for comparing the output from said integrating means with the output from said comparison reference information producing means.
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Abstract
The present invention relates to an ambient light detector, a laser lighting control device using the same suitable for a bar code reader, and a bar code reader. The object is to require no explanation on a special operation and to realize an easy device design and a low manufacturing cost. Each device includes an ambient light detector to detect light around a peripheral device, and judging device to provide a signal indicating that an ambient light detected by the ambient light detector has exceeded a predetermined value over a predetermined time.
227 Citations
45 Claims
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1. An ambient light detector comprising:
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ambient light detecting means for detecting an ambient light around a device; and judging means for providing a signal indicating that the ambient light detected by said ambient light detecting means has exceeded a predetermined value for at least predetermined time, said ambient light detecting means including light detection/conversion means for detecting an ambient light around a device to convert the ambient light into an electrical signal, and amplifying means for amplifying the electrical signal from said light detection/conversion means, said judging means including integrating means for integrating a signal from said amplifying means based on a predetermined time constant comparison reference information producing means for producing comparison reference information following a change in said ambient light, in response to the signal from said integrating means, and comparing means for comparing the output from said integrating means with the output from said comparison reference information producing means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A bar code reader which includes optical scanning means for scanning light from a laser on a bar code and receiving means for receiving light reflected on said bar code, comprising:
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an ambient light detector including ambient light detecting means for detecting an ambient light around a device and judging means for providing a signal indicating that the ambient light detected by said ambient light detecting means has exceeded a predetermined value for at least a predetermined period of time, wherein said judging means includes a lower limiter means for nullifying a light variation detection when said ambient light is less than said predetermined value; and laser lighting control means for controlling the lighting state of said laser in accordance with a result detected by said ambient light detector.
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20. A laser lighting control device suitable for a bar code reader, said laser lighting control device using an ambient light detector, comprising:
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an ambient light detector which is formed of an ambient light detecting means for detecting an ambient light around a device, and judging means for producing a signal indicating that the ambient light detected by said ambient detecting means exceeds a predetermined value for at least a predetermined time, said ambient light detecting means including light detection/conversion means for detecting an ambient light around a device to convert the ambient light into an electrical signal, and amplifying means for amplifying the electrical signal from said light detection/conversion means, and said judging means including integrating means for integrating a signal from amplifying means based on a predetermined time constant, comparison reference information producing means for producing comparison reference information following a change in said ambient light, in response to the signal from said integrating means, and comparing means for comparing the output from said integrating means with the output from said comparison reference information producing means; and laser lighting control means for controlling the lighting state of said laser in accordance with a result detected by said ambient light detector. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
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38. A bar code reader which includes optical scanning means for scanning light from a laser on a bar code and receiving means for receiving light reflected on said bar code, comprising:
an ambient light detector including ambient light detecting means for detecting an ambient light around a device and judging means for providing a signal indicating that the ambient light detected by said ambient light detecting means has exceeded a predetermined value for at least a predetermined period of time, wherein said judging means includes a lower limiter means for nullifying a light variation detection when said ambient light is less than said predetermined value.
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39. A laser lighting control device suitable for a bar code reader, said laser lighting control device including an ambient light detector, comprising:
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ambient light detector including; optical scanning means arranged between a laser and a bar code for illuminating light from said laser onto said bar code; receiving means for receiving light reflected on said bar code; ambient light detecting means for detecting an ambient light around a device; and judging means for producing a signal indicating that the ambient light detected by said ambient light detecting means has exceeded a predetermined value for at least a predetermined time, said ambient light detecting means including light detection/conversion means for detecting an ambient light around a device to convert the ambient light into an electrical signal, and amplifying means for amplifying the electrical signal from said light detection/conversion means, and said judging means including integrating means for integrating a signal from said amplifying means based on a predetermined time constant comparison reference information producing means for producing comparison reference information following a change in said ambient light, in response to the signal from said integrating means, and comparing means for comparing the output from said integrating means with the output from said comparison reference information producing means; and laser lighting control means for controlling the lighting state of said laser in accordance with a result detected by said ambient light detector, said receiving means and said ambient light detector being shared to each other. - View Dependent Claims (40)
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41. A bar code reader which includes optical scanning means for scanning light from a laser on a bar code and receiving means for receiving light reflected on said bar code, comprising:
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an ambient light detector including ambient light detecting means for detecting an ambient light around a device and judging means for providing a signal indicating that the ambient light detected by said ambient light detecting means has exceeded a predetermined value for at least a predetermined time, said ambient light detecting means including light detection/conversion means for detecting an ambient light around a device to convert the ambient light into an electrical signal, and amplifying means for amplifying the electrical signal from said light detection/conversion means, and said judging means including integrating means for integrating a signal from said amplifying means based on a predetermined time constant comparison reference information producing means for producing comparison reference information following a change in said ambient light in response to the signal from said integrating means, and comparing means for comparing the output from said integrating means with the output from said comparison reference information producing means.
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42. A bar code reader which includes optical scanning means for scanning light from a laser on a bar code and receiving means for receiving light reflected on said bar code, comprising:
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an ambient light detector including ambient light detecting means for detecting an ambient light around a device and judging means for providing a signal indicating that the ambient light detected by said ambient light detecting means has exceeded a predetermined value for at least a predetermined time, said ambient light detecting means including light detection/conversion means for detecting an ambient light around a device to convert the ambient light into an electrical signal, and amplifying means for amplifying the electrical signal from said light detection/conversion means, and said judging means including integrating means for integrating a signal from said amplifying means based on a predetermined time constant, comparison reference information producing means for producing comparison reference information following a change in said ambient light, in response to the signal from said integrating means, and comparing means for comparing the output from said integrating means with the output from said comparison reference information producing means; and laser lighting control means for controlling the lighting state of said laser in accordance with a result detected by said ambient light detector.
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43. An ambient light detector, comprising:
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ambient light detecting means for detecting an ambient light around a device; and judging means for providing a signal indicating that the ambient light detected by said ambient light detecting means has exceeded a predetermined value for at least predetermined period of time, wherein said judging means includes a lower limiter means for nullifying a light variation detection when said ambient light is less than said predetermined value.
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44. A laser lighting control device suitable for a bar code reader, comprising:
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an ambient light detector having an ambient light detecting means for detecting an ambient light around a device, and judging means for producing a signal indicating that the ambient light detected by said ambient detecting means exceeds a predetermined value for at least a predetermined period of time; and laser lighting control means for controlling the lighting state of said laser in accordance with a result detected by said ambient light detector, wherein said judging means includes a lower limiter means for nullifying a light variation detection when said ambient light is less than said predetermined value.
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45. A laser lighting control device suitable for a bar code reader, said laser lighting control device including an ambient light detector, comprising:
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ambient light detector including; optical scanning means arranged between a laser and a bar code for illuminating light from said laser onto said bar code; receiving means for receiving light reflected on said bar code; ambient light detecting means for detecting an ambient light around a device; and judging means for producing a signal indicating that the ambient light detected by said ambient light detecting means has exceeded a predetermined value for at least a predetermined period of time, wherein said judging means includes a lower limiter means for nullifying a light variation detection when said ambient light is less than said predetermined value; and laser lighting control means for controlling the lighting state of said laser in accordance with a result detected by said ambient light detector, an ambient light being shared by said receiving means and said ambient light detector.
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Specification