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Method and apparatus for inner face scanning with multi beams

a multi-beam, inner face technology, applied in the direction of optics, instruments, printing, etc., can solve the problems of inability to change the scanning line interval, and inability to achieve correct scanning,

Inactive Publication Date: 2001-09-06
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] A third object of the present invention is to provide a method of simultaneously scanning an inner face of a cylindrical drum with two or more light beams, in which scanning lines are straightened under a simple control, and a scanning line interval can be easily varied with a simple constitution.
[0013] A fourth object of the present invention is to provide an apparatus for simultaneously scanning an inner face of a cylindrical drum with two or more light beams, in which scanning lines are straightened under a simple control, and a scanning line interval can be easily varied with a simple constitution.
[0025] When the compensating mechanism is provided, a preliminary scanning may be performed separately for each light beam prior to recording of image data. The compensation data of each light beam is obtained and stored. Therefore, influences of changes in temperature, changes in properties with an elapse of time, or the like of the optical system or the like can be eliminated. A correct, highly precise scanning can be achieved.

Problems solved by technology

A correct scanning cannot be achieved.
In the former system for rotating the deflecting element with the fixed deflection quantity, there is a problem that because of the constant deflection quantity, it is impossible to change a beam interval, therefore a scanning line interval cannot be changed.
However, this mechanism is hardly available, and expensive.
Therefore, a complicated and precise control is required, and scanning quality is hardly stabilized.
This leads to an expensive device.

Method used

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  • Method and apparatus for inner face scanning with multi beams
  • Method and apparatus for inner face scanning with multi beams
  • Method and apparatus for inner face scanning with multi beams

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Experimental program
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first embodiment

[0053] A principle of a first embodiment according to the present invention is now described with reference to FIGS. 4, 5 and 6. FIG. 4 is an explanatory view of a deflection control of light beams L.sub.1 and L.sub.2, the light beams L.sub.1 and L.sub.2 being directed from a light source along a central axis C of a recording cylindrical drum toward a spinner 30. FIGS. 5A-5D are explanatory views showing a relationship between a rotary position of the spinner 30 and positions of the light beams L.sub.1 and L.sub.2. FIGS. 6A-6D are perspective views of the spinner. In the following description, an offset angle is .psi.=0. Specifically, a plane including the light beams L.sub.1 and L.sub.2 coincides with a maximum deflecting direction of the spinner.

[0054] The light beam L.sub.1, as shown in FIG. 4, reciprocates along an X-axis in an X-Y rectangular coordinate system with an origin of the central axis C on an image focusing plane of the light beams. Also, the light beam L.sub.2 recipr...

second embodiment

[0086] Second Embodiment

[0087] A principle of a second embodiment of the present invention is described with reference to FIGS. 13 and 14. FIG. 13 is an explanatory view showing a principle of a light beam deflection control according to the second embodiment, and FIG. 14 shows scanning line tracks drawn on an inner face of a cylindrical drum D. L.sub.0 is a reference beam and L.sub.1 is the other light beam. These light beams L.sub.0 and L.sub.1 pass a focusing lens (not shown), and are reflected in a radial direction of the drum D by a spinner which rotates on a central axis CL of the drum D to focus on the inner face of the drum D. The spinner is, for example, a reflective mirror which rotates at a high speed with an angle of about 45.degree. relative to the central axis.

[0088] A rotation angle of the spinner relative to the drum D is represented by .theta.. The reference beam L.sub.0 is projected along the central axis CL of the drum D and draws a straight scanning line, i.e., a...

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Abstract

There is proposed a method and apparatus for multibeam scanning an inner face of a cylindrical drum, in which scanning lines are straightened under a simple control, and an interval between the scanning lines can be easily changed, thereby simplifying a constitution. In an embodiment, while keeping an interval between two light beams projected to an optical scanning system, the light beams are one-dimensionally deflected in mutually orthogonal directions in synchronism with a rotation of the spinner, respectively. In a second embodiment, one light beam is projected along a central axis common with the spinner and the cylindrical drum to the spinner. The other light beams are inclined in a plane including the central axis by a constant angle phiy separately predetermined for each of the other light beams, and further inclined in a direction orthogonal to the plane including a rotation axis by an angle phix which is determined in synchronism with a rotation angle theta of the spinner.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a method and an apparatus for scanning an inner face of a cylindrical drum with dual or more light beams, and more particularly to a method and an apparatus for scanning an inner face of a cylindrical drum with plural light beams which are combined and introduced into a common optical scanning system to scan the inner face of the drum.[0003] 2. Description of the Prior Art[0004] There is known an inner face scanning type of a light beam scanning device, wherein a light beam such as a laser beam is introduced into a cylindrical drum to scan an interior surface of the drum. To increase a recording speed in the apparatus of this type, a system with plural light beams, i.e., a multi-beam scanning system is proposed.[0005] In the inner face scanning type of apparatus, plural light beams are introduced along a central axis of the cylindrical drum to a rotating deflector (spinner) disposed on and rotated about the cent...

Claims

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Application Information

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IPC IPC(8): G02B26/10G02B26/12H04N1/047H04N1/06H04N1/191
CPCG02B26/10G02B26/123H04N1/047H04N1/0607H04N1/0635H04N1/0671H04N1/1911H04N2201/0082H04N2201/04712H04N2201/04729H04N2201/04789H04N2201/04731H04N2201/0471H04N2201/04734H04N2201/04744H04N2201/02425H04N2201/04791H04N2201/04765H04N2201/02439H04N2201/04794Y10S359/90
Inventor TAKADA, NORIHISA
Owner FUJIFILM CORP