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EP0635966A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Image scanner with changeable lenses and device for controlling the lens position

Assignee: Mikrotec International Inc
•
Filing: 1994-01-12
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Granted: —
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Expires: 2014-01-12
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Abstract

Abstract A mechanism for and a method of controlling the lens position in an image scanner in which the density of read lines can be varied by selecting one of lens. A base is rotatably provided in a plane parallel to a table on which an original is placed. The lens is supported on the base in such a way that the optical axis of each lens is parallel to the base surface and intersects the rotation axis. A reference pattern is provided at a place where an image receiving device can read it through the lens. On the basis of the received image of the reference pattern, the lens in the optical path is identified, and its position is determined. The rotation of the base is thus controlled to set an appropriate lens in an appropriate position. In such a way, an image scanner such that the lens can be changed in a high precision is provided without increasing the height. <IMAGE>

Inventors

  • 👤 Tadao Ohtsuka
  • 👤 Masao Shoda

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 18:08
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/0402; H04N1/0405; H04N1/024; H04N1/028; H04N1/0408; H04N1/0411; H04N1/042; H04N1/0435; H04N1/0449; H04N1/0452; H04N1/10; H04N1/1013; H04N1/19; H04N1/191; H04N1/192; H04N1/193; H04N2201/00; H04N2201/04; H04N2201/0402; H04N2201/0418

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 148 words
An image scanner comprising a table on which an object is arranged to take in an image of the object by an image receiving element, scanning means for relatively scanning a surface of said table, a reflecting optical system for directing light from said scanning means toward said image receiving element so that it is parallel to said table, and a plurality of kinds of lenses capable of being used in a change-over manner, wherein there is provided a base which is rotatable in a plane parallel to the surface of said table around a pivot provided on an optical path of said light, and said lenses are supported on said base so that the optical axes of the lenses are positioned on the same plane and intersect each other on said pivot, whereby one of said lenses to be used can be selected by rotating said base.
Claim 2
Dependent Claim 30 words
An image scanner according to Claim 1, wherein said table is stationary and said scanning means moves parallel to the surface of said table when the scanning is being made.
Claim 3
Dependent Claim 26 words
An image scanner according to Claim 1, wherein said scanning means is stationary and said table makes a parallel movement when the scanning is being made.
Claim 4
Dependent Claim 80 words
A lens position control structure in an image scanner in which a plurality of lenses can be used in a change-over manner, the image scanner taking in the image of an object by an image receiving element, the structure comprising a reference pattern provided at a predetermined position at which it is readable through the changed-over lens, and means for detecting the kind of the changed-over lens from image data of said reference pattern read by said image receiving element.
Claim 5
Dependent Claim 37 words
A lens position control structure in an image scanner according to Claim 4, further comprising means for detecting the deviation of said lens from the image data of said reference pattern read by said image receiving element.
Claim 6
Dependent Claim 76 words
A lens position control method in an image scanner in which a plurality of lenses can be used in a change-over manner, the image scanner taking in the image of an object by an image receiving element, the method comprising the steps of: reading image data of a reference pattern provided at a predetermined position at which it is readable through the changed-over lens; and detecting a kind of the changed-over lens from said image data.
Claim 7
Dependent Claim 37 words
A lens position control method in an image scanner according to Claim 6, further comprising a step of detecting deviation of said lens from the image data of said reference pattern read by said image receiving element.

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