Manuscript document detecting system and method

A manuscript document detecting system, comprising:

• a scanning light radiating means for radiating scanning light toward a manuscript document;
• a reflected light detecting means for detecting scanning light reflected from said manuscript document;
• and
• a scanning light reflecting section for reflecting said scanning light onto a predetermined position where relative positional relationship is ensured for the manuscript document placed at a standard position on a scanning orbit of said scanning light;
• wherein at least one of a size and a position of said manuscript document is detected by measuring a relative light receiving timing between reflected light from said scanning light reflecting section and reflected light from said manuscript document.

A method of detecting a manuscript document, comprising the steps of:

• radiating scanning light toward said manuscript document;
• detecting scanning light reflected from said manuscript document;
• generating a pulse signal representing a scanning position of said scanning light;
• detecting an end portion of said manuscript document based on said reflected light, and detecting at least one of a size and a position of said manuscript document based on said pulse signal;
• generating said pulse signal representing a start of light scanning and representing the position of the scanning light after starting a scanning operation per each of respective predetermined time intervals;
• generating a clock signal oscillating with a constant time period shorter than that of said pulse signal for measuring said predetermined time intervals;
• and
• calculating the position of said scanning light as a function of both a count value of said pulse signal and a count value of said clock signal.

A method of detecting a manuscript document, comprising the steps of:

• radiating scanning light toward a manuscript document;
• detecting scanning light reflected from said manuscript document;
• reflecting said scanning light onto a predetermined position where relative positional relationship is ensured for the manuscript document placed at a standard position on a scanning orbit of said scanning light;
• and
• detecting at least one of a size and a position of said manuscript document by measuring a relative light receiving timing between reflected light from a scanning light reflecting section and reflected light from said manuscript document.

A manuscript document detecting system, comprising:

• a control means for generating a first light receiving signal of a first polarity obtained by light reflected from an object at a side of a manuscript document for a focal distance established on an upper part of a manuscript document mounting stand, for generating a second light receiving signal of a second polarity obtained by light reflected from an object located at a more remote position than said focal distance, and for mutually outputting said first and second light receiving signals having opposite polarities for a predetermined level;
• and
• a light source for generating scanning light;
• wherein at least one of a size and a position of said manuscript document is detected based on a result of detecting said first light receiving signal of said first polarity;
• the light source for generating scanning light is turned on and off or power-modulated with a predetermined period and duty cycle ratio excluding 50%;
• and
• at least one of a size and a position of said manuscript document is detected based on the second light receiving signal coinciding with said predetermined period and duty cycle ratio.

A manuscript document detecting system, comprising:

• a manuscript document mounting stand;
• a reflecting portion, for reflecting scanning light, provided on a predetermined position of said manuscript document mounting stand so as ensure a relative positional relationship of mounting a manuscript document;
• means for radiating scanning light toward said manuscript document placed on said manuscript document mounting stand;
• means for measuring a difference of relative light receiving timing between reflected light from said reflecting portion and reflected light from said manuscript document;
• means for detecting at least one of a size and a position of said manuscript document as a function of the measured difference of the relative light receiving timing;
• a reflected light measuring means for measuring a light receiving period of the light reflected from the reflecting portion;
• and
• a control means for executing a control operation such that the manuscript document is processed as a predetermined manuscript document size when the light receiving period exceeds a predetermined time period.

A manuscript document detecting system, comprising:

• means for switching scanning light on and off so as to power-modulate said scanning light with a predetermined period, and for radiating said scanning light towards a manuscript document;
• a light receiving means for optoelectrically converting said switching scanning light and incident light and for amplifying and binarizing the optoelectrically converted scanning light to form a binarized light receiving signal;
• means for detecting the binarized light receiving signal coinciding with said predetermined period and for detecting at least one of a size and a position of said manuscript document;
• an operational calculation processing means in which a monitoring time longer than said predetermined period is previously set and, when a high or low level logic larger than a predetermined width is not detected during said monitoring time in the binarized light receiving signal, said binarized light receiving signal is processed as disturbance light.

A method of detecting a manuscript document, comprising the steps of:

• scanning a manuscript document mounted on a mounting stand from a lower side thereof;
• mutually outputting, with opposite polarities, for a predetermined level, a first light receiving signal of a first polarity obtained by light reflected from an object at a side of said manuscript document for a focal distance established on an upper part of said manuscript document mounting stand, and second light receiving signal of a second polarity obtained by light reflected from an object located at a more remote position than said focal distance;
• detecting at least one of a size and a position of said manuscript document based on a result of detecting only said first light receiving signal of first polarity;
• turning on and off or power-modulating a light source for generating scanning light with a predetermined period and duty cycle ratio excluding 50%;
• and
• detecting at least one of a size and a position of said manuscript document based on a light receiving signal coinciding with said predetermined period and duty cycle ratio.

A method of detecting a manuscript document, comprising the steps of:

• providing a reflecting portion, for reflecting scanning light, on a predetermined position of a manuscript document mounting stand so as ensure a relative positional relationship of mounting a manuscript document;
• radiating scanning light toward said manuscript document placed on said manuscript document mounting stand;
• measuring a difference of relative light receiving timing between reflected light from said reflecting portion and reflected light from said manuscript document;
• detecting at least one of a size and a position of said manuscript document based on the measured difference of the relative light receiving timing;
• measuring a light receiving period of the light reflected from the reflecting portion;
• and
• executing a control operation such that the manuscript document is processed as a predetermined manuscript document size when the light receiving period exceeds a predetermined time period.

A method of detecting a manuscript document, comprising the steps of:

• switching scanning light on and off so as to power-modulate said scanning light with a predetermined period;
• radiating said scanning light towards a manuscript document;
• optoelectrically converting said switching scanning light and incident light;
• amplifying and binarizing the optoelectrically converted scanning light to form a binarized light receiving signal;
• detecting the binarized light receiving signal coinciding with said predetermined period;
• detecting at least one of a size and a position of said manuscript document;
• previously setting a monitoring time longer than said predetermined period;
• and
• processing said binarized light receiving signal as disturbance light, when a high or low level logic larger than a predetermined width is not detected during said monitoring time in the binarized light receiving signal.