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Shaft-type linear motor
| Details |
Inventors: Nanba, Katsuhiro; Kitaoka, Toshio; Yagoto, Mitsutoshi;
Assignee: Minolta Co. , Ltd. (Osaka, JP)
Primary Examiner: Ramirez; Nestor
Assistant Examiner: Jones; Judson H.
Attorney, Agent or Firm: Sidley & Austin
An image reading apparatus comprising a fluorescent lamp for lighting an original document; an inverter circuit for turning on the lamp; a plurality of optical part carrying sliders carrying the lamp on one of the sliders; and a magnetic encoder including a magnetism detecting element, wherein the detecting element and the inverter circuit (and an operation panel having a LCD) are spaced from each other and are located at opposite sides of a center of a travel region of the sliders. A shaft-type linear motor comprising a yoke stationarily arranged along the moving direction of a movable piece and made of a ferromagnetic material. A shaft-type linear motor comprising a shaft-type stator and a movable piece reciprocatable along the stator, wherein the stator and the movable piece are covered with a protection cover. The cover may be made of a ferromagnetic material. |
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DETAILED DESCRIPTION Accordingly, the invention aims to provide an image reading apparatus including one or more sliders which carry optical parts and can linearly reciprocate in a predetermined direction for optically scanning and thereby reading an image on an original document located at a predetermined position, and particularly an image reading apparatus provided with position detecting means such as a magnetic encoder for detecting positions of the sliders.
More specifically, the invention has the following objects.
An object of the invention is to provide an image reading apparatus of the above mentioned type, in which a lighting device is carried on one of the sliders for lighting an original document, and a power circuit of the lighting device may generate noises such as high frequency noises, and particularly an image reading apparatus, which can suppress an influence exerted by the noises on detection of the slider positions, by the position detecting means to a substantially allowed level, and thereby can perform good image reading, and also, in which run-away out of control and collision of the sliders can be suppressed to a higher extent.
Another object of the invention is to provide an image reading apparatus of the above mentioned type, in which an LCD is employed for displaying various kinds of information, and the LCD may generate noises such as high frequency noises, and particularly an image reading apparatus, which can suppress an influence exerted by the noises on detection of the slider positions by the position detecting means to a substantially allowed level, and thereby can perform good image reading, and also, in which run-away out of control and collision of the sliders can be suppressed to a higher extent.
The invention also aims to provide a linear motor of a shaft type, which can be used for driving, e.
g.
, a reciprocatable slider carrying an optical part in the above image reading apparatus, and includes a stator in a rod-like form having a field magnet provided with N- and S-type magnetic poles arranged alternately, and a movable piece having an armature coil fitted around the stator and being reciprocatable along the stator, and more specifically aims to achieve the following objects
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