|Publication number||USRE41568 E1|
|Application number||US 11/299,239|
|Publication date||Aug 24, 2010|
|Filing date||Dec 9, 2005|
|Priority date||Jan 26, 2000|
|Also published as||US6661541|
|Publication number||11299239, 299239, US RE41568 E1, US RE41568E1, US-E1-RE41568, USRE41568 E1, USRE41568E1|
|Original Assignee||Tsang-Huai Chang|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (22), Classifications (10), Legal Events (7)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of Invention
The present invention relates to a closed circuit control device for a scanner. More particularly, the present invention relates to a closed circuit control device that utilizes an optical meter.
2. Description of Related Art
In general, optical scanners can have two main modes of operation, namely, reflective scanning and transparency scanning. In reflective scanning, a document (the document is non-transparent) is placed on top of a transparent glass panel, and then light from a light source shines through the transparent glass panel and reflects back from the document. After passing through a set of optical lenses, the reflected light enters an optical sensor such as a charge couple device (CCD) or a contact image sensor (CIS). Ultimately, a scan image is formed. In transparency scanning, a document (the document can be a film negative or a transparency for projector) is also placed on top of a transparent glass panel. However, light from a light source has to shine through the document first. After going through the transparent glass panel, the light passes through a set of optical lenses and finally enters the optical sensor to produce a scan image.
To carry out the scanning of a transparent document 40, a light source inside the light source carrier 10 emits a light ray that passes through a crevice 14. The light beam passes through the document 40 and the transparent glass panel 20 and then enters the sensor box 30 through its crevice 34. Similarly, the light is transmitted to the optical sensor 32 after going through the optical system 36 (detail structure not shown). The optical sensor 32 then transforms the incoming light into optical data for subsequent image production, thereby completing one scanning operation. Thereafter, the light source carrier 10 and the sensor box 30 step forward in synchrony along the transparent glass panel 20 to carry out more scanning operations until everything on the document 40 has been converted into image data. All through the transparency scanning operation, the light source 38 inside the sensor box 30 produces no light.
In a conventional scanner, whether the scanning is in reflective or transparency mode, the light source carrier and the sensor box are driven by a motor. In general, control of the motor is difficult, leading to some jerkiness of motion, that is, sometimes faster and sometimes slower. Such discontinuous motion may lead to some discontinuity in the extraction of image data and ultimately may lead to some distortion of the scanned image.
To resolve the driving problem, sensors are often installed inside a conventional scanner for monitoring the speed of carriers so that feedback signals are returned to the motor. However, the installation of sensors complicates the control circuit and increases production cost.
Accordingly, one object of the present invention is to provide a closed circuit control device for a scanner. The device has an optical meter attached to the transparent glass panel of a scanner. During scanning, images of the black and white strips on the optical meter are formed on an optical sensor such as CCD or CIS so that an output signal is generated. The output signal is used for processing and computation, and hence scanning speed and direction of the scanner is under control.
A second object of the invention is to provide a closed circuit control device for a scanner. The device uses an optical sensor such as CCD or CIS instead of a conventional motor control sensor for controlling scanning speed and direction. Hence, production cost is lowered and circuit design is simplified.
A third object of the invention is to provide a closed circuit control device for a scanner. A plurality of optical meters is attached to the transparent glass panel of the scanner so that the optical sensor within the scanner is able to receive signals during scanning. Hence, motion of the carriers inside the scanner is under proper control.
To achieve these and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, the invention provides a closed circuit control method for controlling a scanner. In the scanning mode, an optical meter produces an image on an optical sensor. The image is transformed into sense signals, and then the sense signals are transferred to a computational device where motion of the carriers is determined. Later, speed of carriers is compared with a preset speed. If the speed of carriers is greater than the preset speed, motor speed is reduced. On the other hand, if the speed of carriers is less than the preset speed, motor speed is increased. When the carriers are running at the exact preset speed, the motor speed is maintained.
It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. In the drawings,
Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
To scan a non-transparent document (not shown), the scanner operates in a reflective scanning mode. A light source 138 under the transparent glass panel emits a light ray. The light ray passes through the transparent glass panel and reaches both the document and the optical meter 100. Light rays are reflected back from both the document and the optical meter 100. The reflected rays pass through an optical system 136 and arrive at an optical sensor 132 (a CCD or a CIS), thereby forming images of both the document and the optical meter 100. The images are transformed inside the optical sensor 132 to form image data. In this invention, image data obtained from the optical meter are used as signals for controlling the scanning speed and direction of the scanner.
When the carrier advances forward, the optical sensor picks up a sequence of digital signals having the pattern ‘10’, ‘11’, ‘01’ and ‘00’, cyclically. Conversely, when the carrier moves backward, the optical sensor will picks up a sequence of digital signals having the pattern ‘00’, ‘01’, ‘11’ and ‘10’, cyclically. Hence, the direction of movement of the carrier is absolutely determined just by observing the digital signal sequence obtained from the optical sensor. In other words, besides controlling the running speed of the motor, the black and white signals generated by the optical meter are further capable of detecting direction of motion.
The optical meter described in the first and the second embodiment of this invention can be used in scanning both reflective document scanning and transparent document scanning. For example, the optical meter can be attached to the transparent glass panel facing the sensor carrier to carry out reflective scanning. On the other hand, the optical meter can be attached to the transparent glass panel facing the light source carrier to carry out a transparency scanning. The only criterion for installing the optical meters is that they must not overlap.
In summary, this invention provides a closed circuit control device for a scanner. The device has an optical meter attached to the transparent glass panel of a scanner. During scanning, images of the black and white strips on the optical meter are formed on an optical sensor such as CCD or CIS so that an output signal is generated. The output signal is used as a means for controlling the scanning speed and direction of the scanner.
The invention also provides a closed circuit control device that uses an optical sensor such as CCD or CIS instead of a conventional motor control sensor for controlling scanning speed and direction. Hence, production cost is lowered and circuit design is simplified.
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
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|U.S. Classification||358/474, 358/497, 250/208.1, 358/496, 358/505, 358/482|
|International Classification||H04N1/047, H04N1/04|
|Jan 11, 2007||AS||Assignment|
Owner name: VEUTRON CORPORATION, TAIWAN
Free format text: CHANGE OF NAME;ASSIGNOR:UMAX DATA SYSTEMS, INC.;REEL/FRAME:018749/0918
Effective date: 20021029
Owner name: TRANSPACIFIC IP, LTD., TAIWAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VEUTRON CORPORATION;REEL/FRAME:018749/0733
Effective date: 20050706
Owner name: UMAX DATA SYSTEMS, INC., TAIWAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CHANG, TSANGHUAI;REEL/FRAME:018749/0720
Effective date: 20000306
|Aug 14, 2009||AS||Assignment|
Owner name: TRANSPACIFIC SYSTEMS, LLC, DELAWARE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TRANSPACIFIC IP LTD.;REEL/FRAME:023107/0267
Effective date: 20090618
|May 23, 2011||FPAY||Fee payment|
Year of fee payment: 8
|Jul 17, 2012||CC||Certificate of correction|
|Jun 17, 2013||AS||Assignment|
Owner name: TITUSVILLE CANAVERAL LLC, DELAWARE
Free format text: MERGER;ASSIGNOR:TRANSPACIFIC SYSTEMS, LLC;REEL/FRAME:030628/0681
Effective date: 20130213
|Jun 18, 2013||AS||Assignment|
Owner name: INTELLECTUAL VENTURES I LLC, DELAWARE
Free format text: MERGER;ASSIGNOR:TITUSVILLE CANAVERAL LLC;REEL/FRAME:030639/0330
Effective date: 20130214
|May 26, 2015||FPAY||Fee payment|
Year of fee payment: 12