An optical scanner that may assemble the lens design for varying the focus and resolution, having a light source, a reflection compound mirror, a charge coupled device, a basic objective lens and a compound lens. The basic objective lens is designed by simulation software. According to the lens design theory, the compound lens is designed. By incorporating the basic objective lens and the compound lens, different resolutions such as 1200 dpi, 1600 dpi and 2400 dpi of the optical scanner are obtained without redesigning the lens device, the current specification of the optical scanner is also varied.
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0. 9. A scanner, comprising:
an optical module containing a light source, a reflection component and an optical sensor, wherein the light source is used to illuminate a document to obtain an image light, and wherein the reflection component is located in an optical path of the image light to direct the image light on the optical sensor; and
a basic objective lens component located on the optical path of the image light between the optical sensor and the reflection component, wherein the basic objective lens component includes a first linkage configured to removably attach to a corresponding second linkage of a compound lens component.
0. 4. A scanner, comprising:
means for illuminating a document to provide image light representing the document;
means for reflecting the image light to direct the image light along a light path;
means for focusing the reflected image light on an optical sensor, wherein the focused image light corresponds to a first scanning resolution; and
means for releasably coupling a compound lens component to the focusing means, wherein the releasably coupling means is attached to the focusing means or the compound lens component;
wherein, if the compound lens component is coupled to the focusing means, the focused image light corresponds to second scanning resolution.
1. An objective compound lens, applied to an optical scanner having at least a light source, a reflection compound mirror and an optical sensor, wherein the light source is used to radiate a document to obtain an image light, the reflection compound mirror is located in an optical path of the image light to project the image light on the optical sensor, and the objective compound lens is located between in the optical path of the image light between the optical sensor and the reflection compound mirror, the objective compound lens comprising:
a basic objective lens having a first linkage, ; and
a plurality of compound lenses having corresponding second linkage respectively, wherein any one of the second linkages is suitable for connecting and detaching with the basic objective lens via the first linkage;
wherein when the basic objective lens is coupled to a selected one of the selected plurality of compound lens lenses located on the optical path of the image light between the basic objective lens and the reflection compound mirror, the optical scanner has a resolution corresponding to the selected compound lens, and when any one of the compound lenses is not connected to the basic objective lens, the image light is projected on the optical sensor via the basic object objective lens only.
2. The object compound lens according to
3. The optical objective compound lens according to
0. 5. The scanner of
0. 6. The scanner of
0. 7. The scanner of
0. 8. The scanner of
0. 10. The scanner of
0. 11. The scanner of
0. 12. The scanner of
0. 13. The scanner of
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1. Field of the Invention
The invention relates in general to an optical scanner, and more particularly, to an optical scanner that may assemble different lens designs for changing focus and resolution.
2. Description of the Related Art
The conventional optical scanner (referring to
The conventional objective lens is designed by simulation software according to the requirements of resolution, total track (TT), magnification and modulation transfer function (MTF) provided by the client. The factors of lens, material, curvature, number of lenses, size, and length of the objective lens are thus determined. The sample is then fabricated, and the inspection of the sample and simulation are performed. For example, the objective lens 502 of 600 dpi as shown in
According to the above, the conventional design of the objective lens has to meet the specification requirements including the resolution, the total track, the magnification and the modulation transfer function. For different specification requirements, a new objective lens has to be designed. Alternatively, the specification of the current optical scanner has to be changed.
The invention provides an objective compound lens design that may change the focus and resolution without a redesign. By appropriately designing the basic objective lens and incorporating it with various compound lenses, the required resolution and specification can be obtained.
The object compound lens structure may change the focus and resolution of the optical scanner by switching the object lenses.
The objective compound lens can be used in an optical scanner that comprises at least a light source, a reflection compound mirror and an optical sensor. A light source is used to radiate a document to obtain an image light. The objective compound lens is located along the optical path of the image light between the optical sensor and the reflection compound mirror. The object compound lens comprises a basic object lens and at least a compound lens. The compound lens can be adjacent to or detached from the basic objective lens. Or alternatively, more than one compound lens can be installed on a seat and disposed between the basic objective lens and the reflection compound mirror. Via a driving device, the seat can be driven, and the compound lenses on the seat can be incorporated with the basic objective lens.
While connecting the compound lens with the basic objective lens, or incorporating the compound lens with the basic objective lens, the compound lens is located along the optical path of the image light between the basic objective lens and the reflection compound mirror. The optical scanner can thus have different resolutions. Without incorporating the compound lens, the image light can be projected to the optical sensor via the basic objective lens only, so that only a basic resolution is obtained.
Both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
First Embodiment
Second Embodiment
In
In
Accordingly, the invention comprises at least the following advantages:
(1) The objective lens design of the scanner is modularized. According to different resolutions, magnifications, optical lengths and image quality requirements, a compound lens is incorporated without redesigning the objective lens or changing the current scanner design. The reuse rate of the scanner is also increased.
(2) In the objective lens design provided by the invention, the basic objective lens has a constant form, so that it can be reused for different resolution requirements. The design cost is reduced, and the redefine and lens simulation required by changing lens design are also avoided.
(3) The compound lens in the first and second embodiment can be adjusted by the user without effecting a major adjustment of the system. In the third embodiment, the compound lens is automatically changed according to the resolution required by user. The optical scanner is upgraded for having different optical resolutions.
(4) The design of the compound lens can be switched for various resolutions, so that the design cost of the objective lens is decreased.
(5) The compound lens can be adjusted according to the image requirement of the customers.
Other embodiments of the invention will appear to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples to be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
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