Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1994-04-19
1996-12-17
Rogers, Scott A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358474, 358494, 359676, 359806, 359823, 359861, 359862, 359872, H04N 104, H04N 1393, G02B 704, G02B 1514, G02B 2702
Patent
active
055859372
ABSTRACT:
A reading unit for an image reading device includes a lens tube for forming an image of an object and a line sensor for converting the formed image into an electrical signal. A reducing/magnifying mechanism is included for changing the magnification of the image detected by the line sensor. The lens tube is movable such that the optical path length between the lens tube and the line sensor is adjustable to thereby vary magnification of the image. Further, in response to the movement of the lens tube, a movable mirror is adjusted. The mirror is set in a first predetermined position and directs reflected light from the object to the lens tube to shorten the optical path length between the object and the lens tube and thus relatively increase magnification, in response to the lens tube being in a predetermined normal position with a relatively long optical path length between the lens tube and the line sensor. Then, the mirror is set in a second predetermined position and does not direct reflected light from the object to the lens tube to lengthen the optical path between the object and the lens tube and thus relatively decrease magnification, in response to the lens tube being in a predetermined reducing position with a relatively short optical path length between the lens tube and the line sensor. Movement of both the movable mirror and the lens tube are therefore linked together and are each displaced between predetermined positions so as to vary magnification of the image and to prevent distortion in the image read by the line sensor.
REFERENCES:
patent: 3837743 (1974-09-01), Amemiya
patent: 4338022 (1982-07-01), Farago
patent: 4870294 (1989-09-01), Hasegawa
patent: 4875104 (1989-10-01), Kamon
patent: 4924259 (1990-05-01), Wise
patent: 5140443 (1992-08-01), Iwahara et al.
patent: 5291312 (1994-03-01), Aikawa et al.
patent: 5335093 (1994-08-01), Imoto
patent: 5420700 (1995-05-01), Maeda et al.
Kokubo Kazuyuki
Nakagawa Kunihiko
Nakao Hiroshi
Mitsubishi Denki & Kabushiki Kaisha
Rogers Scott A.
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