Digital imaging device
View Patent ↗The present invention is an inexpensive and accurate means of improving resolution when imaging a small digital display onto a larger photosensitive medium. The device includes a printer having a housing that encloses, in a common cavity thereof, an arrangement comprising a digital area array display, a plurality of lenses, and an image plane. The digital area array display, the plurality of lenses, and the image plane are spaced along an optical axis extending from the digital area array display through the plurality of lenses, and toward the image plane such that a digital image provided by the display can be brought into focus onto the imaging plane by the plurality of lenses. One of the plurality of lenses is a transposable lens, the transposable lens capable of being transposed out of the optical axis during the operation of the printer, to increase the perceived resolution of the digital image focused onto the imaging plane. The invention provides in another aspect, a jogging mechanism for jogging a lens, the device comprising a first translating means for jogging an transposable lens in a first direction, a second translating means for jogging the transposable lens in a second direction, and a biasing means. In an alternate aspect, the present invention also provides a method of imaging a digital display onto an image plane, whereby the method of imaging increases the perceived resolution of the digital image focused onto said imaging plane.
1. A method of imaging a digital display onto an image plane, said method comprising the steps of:
a) providing a digital display, a plurality of lenses, and an image plane onto which a photosensitive medium may be superposed, said digital display, said plurality of lenses, and said image plane are spaced along an optical axis extending from said digital display through said plurality of lenses, and toward said image plane such that a digital image provided by said display can be brought into focus onto said image plane by said plurality of lenses, and one of said plurality of lenses is a transposable lens, said transposable lens capable of being transposed out of said optical axis during the operation of a printer;
b) illuminating said digital display with a first digital image data set for a fixed period of time, turning off said digital display;
c) transposing said transposable lens a fixed distance, in a first direction;
d) illuminating said digital display for a second fixed period of time, using a second digital image data set, turning off said digital display; and
e) whereby said method of imaging increases the perceived resolution of the digital image focused onto said image plane.
2. The method of claim 1 wherein a photosensitive medium defines said image plane.
3. The method of claim 1 wherein said digital display is a microdisplay.
4. The method of claim 1 wherein said digital display is a liquid crystal display.
5. The method of claim 1 wherein said fixed distance is a distance being less than the width of one pixel of said digital display.
6. The method of claim 5 wherein said fixed distance is equal to one half of the width of a pixel on said digital display.
7. The method of claim 1 further including transposing said transposable lens said fixed distance for a second time, and using a third digital image data set to illuminate said digital display for a third period of time, turning off said digital display.
8. The method of claim 7 wherein said transposing said transposable lens for a second time is in a second direction, which is different from said first direction.
9. The method of claim 8 further including transposing said transposable lens said fixed distance for a third time, and using a fourth digital image data set to illuminate said digital display for a fourth fixed period of time, turning off said digital display.
10. The method of claim 9 wherein said first, second, third and fourth fixed periods of time are a portion of said photosensitive medium's total exposure time.
11. The method of claim 9 wherein said transposing said transposable lens for a third time is in a third direction, which is different from said first and second directions.