JPH0611413A - Photoelectric transducer device and inter-bit dispersion information sensing method with the device - Google Patents

Abstract

PURPOSE:To provide a photoelectric converting device, which can simply sense the dispersion information without use of any all while document sheet, and offer a dispersion information sensing method for dispersion from bit to bit. CONSTITUTION:The image information on the surface of a document sheet is continuously photoelectric transduced by a photoelectric transducer element array 1 while the docunaent sheet irradiated with an illuminative light source 4 is moved by a feed roller 3. The roller 3 is installed facing the array 1, and a white or black reflex surface 5 is formed on the periphery of the roller 3 so as to photoelectric transduce the reflected light from the reflex surface 5 with the array 1, and dispersion of the conversion values is sensed as dispersion information from bit to bit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to detection of variation information between bits in a photoelectric conversion device such as a facsimile or a copying machine, and in particular, a white or black reflective surface is formed on the outer peripheral surface of a paper feed roller, and reflected light from this reflective surface The present invention relates to a detection method for photoelectrically converting a signal to obtain variation information between bits and a photoelectric conversion device in which the detection method is performed.

[0002]

2. Description of the Related Art A photoelectric conversion device using a line sensor is generally adopted in a facsimile machine, a copying machine, etc. There is some variation. Therefore, some conventional photoelectric conversion devices are provided with a bit correction circuit for correcting the above variations. This bit correction circuit causes a photoelectric conversion element array to read a plain white so-called all-white original document once to detect the amount of variation in output in bit units, and appropriately corrects the bit output based on the detected value. It is a thing.

However, such a method of detecting variation information between bits requires an all-white original and requires a photoelectric conversion element array to read it.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised in order to effectively solve the above problems, and its object is photoelectric conversion capable of easily detecting variation information without using an all-white original. An object of the present invention is to provide a method for detecting variation information between devices and bits.

[0005]

SUMMARY OF THE INVENTION A gist of the present invention is a photoelectric conversion device for continuously photoelectrically converting image information on the surface of an original by a photoelectric conversion element array while moving an original illuminated by an illumination light source by a paper feed roller. , The paper feed roller is arranged to face the photoelectric conversion element array, and a white reflection surface is formed on the outer peripheral surface of the paper feed roller, and the reflected light from the reflection surface is converted by the photoelectric conversion element array. A photoelectric conversion device is provided with a circuit for performing photoelectric conversion and detecting a variation in the converted value as variation information between bits.

The subject matter of the present invention is also used in a photoelectric conversion device for continuously photoelectrically converting image information on the surface of the original by a photoelectric conversion element array while moving an original illuminated by an illumination light source by a paper feed roller. , The paper feed roller is arranged to face the photoelectric conversion element array, and a black reflective surface is formed on the outer peripheral surface of the paper feed roller, and the reflected light from the reflective surface is converted by the photoelectric conversion element array. There is also a variation information detection method between bits in a photoelectric conversion device, which is characterized by performing photoelectric conversion and detecting the variation in the conversion value as variation information between bits.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic structure of a photoelectric conversion device using a line sensor. In FIG. 1, 1 is a photoelectric conversion element array, 2 is a SELFOC lens array, 3 is a paper feed roller, and 4 is an illumination light source. The optical axis of the SELFOC lens array 2 is perpendicular to the photoelectric conversion element array 1, and the paper feed roller 3 is arranged so that the upper end thereof faces the lower end of the SELFOC lens array 2. . Then, when an original document (not shown) is fed onto the paper feed roller 3, the surface of the original document is irradiated with the light of the illumination light source 4, and the image information of the original surface is transferred to the SELFOC lens array 2
And the photoelectric conversion element array 1 are configured to perform photoelectric conversion on a bit-by-bit basis.

Unlike the conventional one, the paper feed roller 3 has a white reflecting surface 5 formed on the entire outer periphery thereof. Then, when the light from the illumination light source 4 is applied to the reflecting surface 5, the reflected light is photoelectrically converted by the SELFOC lens array 2 and the photoelectric conversion element array 1 like image information. .

The photoelectric conversion device is configured as described above, and the variation information between bits in the photoelectric conversion element array 1 is detected as follows. That is, when the illumination light source is turned on with no document inserted, the reflected light from the reflection surface 5 of the paper feed roller 3 is condensed by the SELFOC lens array 2 and then photoelectrically converted in bit units by the photoelectric conversion element array 1. To be converted. Then, the variation of the converted value is transferred to the bit correction circuit as variation information between bits.

Although the reflecting surface 5 of the paper feed roller 3 is white in the above embodiment, the reflecting surface 5 may be black if it is desired to detect bit-to-bit variation information with respect to black. Further, when it is desired to detect the variation information between the bits for white and black, the white and black reflecting surfaces may be formed on the outer peripheral surface of the paper feed roller 3 by half each.

[0011]

As described above, the present invention forms a white or black reflective surface on the outer peripheral surface of a paper feed roller, and photoelectrically converts the reflected light from the reflective surface by a photoelectric conversion element array,
Since the variation of the conversion value is detected as the variation information between bits, the variation information can be easily detected without using a so-called all-white original. It is also possible to automatically detect the variation information. In this case, the predetermined bit correction is performed regardless of the presence or absence of the variation information between the bits, so that the reliability or stability of the photoelectric conversion device is significantly increased. Can be improved.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a photoelectric conversion device showing an embodiment of the present invention.

[Explanation of symbols]

 1 Photoelectric conversion element array 2 SELFOC lens array 3 Paper feed roller 4 Illumination light source 5 Reflective surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichi Seito 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (2)

[Claims] 1. A photoelectric conversion device for continuously photoelectrically converting image information on the surface of an original by a photoelectric conversion element array while moving an original illuminated by an illuminating light source by a paper feed roller. The white reflection surface is formed on the outer peripheral surface of the paper feed roller while facing the photoelectric conversion element array, and the light reflected from the reflection surface is photoelectrically converted by the photoelectric conversion element array, and this conversion is performed. A photoelectric conversion device having a circuit for detecting variation in value as variation information between bits. 2. A photoelectric conversion device for continuously photoelectrically converting image information on the surface of an original by a photoelectric conversion element array while moving an original illuminated by an illumination light source by a paper feed roller. The black reflective surface is formed on the outer peripheral surface of the paper feed roller while facing the photoelectric conversion element array, and the light reflected from the reflective surface is photoelectrically converted by the photoelectric conversion element array, and this conversion is performed. A method for detecting variation information between bits in a photoelectric conversion device, characterized in that variation in value is detected as variation information between bits.