Optical: systems and elements – Lens – With reflecting element
Reexamination Certificate
2000-05-23
2001-10-09
Schwartz, Jordan M. (Department: 2873)
Optical: systems and elements
Lens
With reflecting element
C359S721000
Reexamination Certificate
active
06301061
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a switching device for multiple (dual) focus points of multiple (dual) optical paths, and especially to a switching device in which various scanning optical paths or dual optical paths can be performed.
As show in
FIG. 1
, the current scanning optical path device includes a glass
1
arranged in a scanner (not shown) and for supporting a document, a reflector
2
below the glass
1
, a primary lens
3
with respect to the reflector
2
and arranged at one side in the scanner, a sensing element
4
behind the primary lens
3
. After the document is radiated by light, the image of the scanning article is reflected by the reflector
2
, then is projected to a lens
3
, and then is received by the sensing element
4
so as to read the image of the document. In order to prevent that the transmitted original document, such as a positive piece or a negative piece, placed above the glass
1
, a frame is added. By the width of the frame, the original document is placed higher than the surface of the glass with a distance so as to generate Newton rings (interference strips) in scanning so that the scanning effect is not preferred.
In the feeding process of an auto paper feeding, the original document is effected by a guide piece of the auto paper feeder so that the original document can not be correctly in the focus plane (that in the surface of the glass in the scanner). Therefore, Newton ring (interference strips) occurs so as to induce a bad image.
In order to solve the aforesaid problem, in another scanning optical path device (such as that shown in FIGS.
2
A and
2
B), a lenses with thickness t is arranged between a reflector
2
and a primary lens
3
(according to principle of optics, a lenses with reflectivity of 1.5, the optical path is increased to ⅓ of the thickness, namely, the original document is placed above the surface with a length of t/3). When the lenses t is switched to be between the reflector
2
and the primary lens
3
, the second focus point d′ has a height h being approximate equal to t/3. Thus, the original document is placed above the original focus point d.
However, this design has solved some prior art problems, but the optical path and focus points are fixed so not to be changed and thus, it can not be suitable in various conditions for acquiring a clear image. Therefore, there is an eager demand for a novel switching device for multiple (dual) focus points of multiple (dual) optical paths for improving the defects in the prior art designs.
SUMMARY OF THE INVENTION
The object of the present invention is to solve the switching with/without lenses. In the present invention, at least two lenses are arranged between the reflector and the primary lens. By the thickness switching of these lenses, the switching for multiple (dual) focus points or multiple (dual) optical paths are performed in order to avoid Newton rings (interference strips) effect due to the original document being placed above the original document so as not to be focused correctly.
Another object of the present invention is to provide a switching device for multiple (dual) focus points of multiple (dual) optical paths, in which the lenses can be displaced horizontally, or in cambered path, or in a circumference of a round so that the user may switch the lenses of different thickness.
A further object of the present invention is to provide a switching device for multiple (dual) focus points of multiple (dual) optical paths, wherein the lenses are arranged in a straight line, these lenses are transversal arranged or displaced, or is displaced upwards or downwards so that the switching for multiple (dual) focus points or multiple (dual) optical paths are performed
A still object of the present invention is to provide a switching device for multiple (dual) focus points of multiple (dual) optical paths, wherein two (or many) lenses of different widths can be plated in the same way for acquiring an identical scanning effect.
The other object of the present invention is to provide a switching device for multiple (dual) focus points of multiple (dual) optical paths, wherein the present invention can be applied to an auto paper feeder so that the document on the auto paper feeder can be focused correctly for being scanned.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when reading in conjunction with the appended drawing.
REFERENCES:
patent: 4575398 (1986-03-01), Tschishow
patent: 6233063 (2001-05-01), Bernasconi et al.
patent: 0 521 311-A1 (1993-01-01), None
Bacon & Thomas PLLC
Schwartz Jordan M.
LandOfFree
Switching device for multiple (dual) focus points of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Switching device for multiple (dual) focus points of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switching device for multiple (dual) focus points of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2611097