Optical lens of optical scanner
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.
This application is a divisional application of, and claims the priority benefit of, U.S. application Ser. No. 09/921,949 filed on Aug. 3, 2001, U.S. Pat. No. 6,587,247.
BACKGROUND OF THE INVENTION1. 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.
SUMMARY OF THE INVENTIONThe 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:
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- (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.
Claims
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 illuminate a document to obtain an image light, the reflection compound mirror is located in an optical path of the image light to protect the image light on the optical sensor, and the objective compound lens is located between on 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; and
- a mounting seat; and
- a plurality of compound lenses, only one of which is suited for connecting and detaching with the mounting seat, a mounting seat configured to releasably couple a compound lens thereto, the mounting seat configured to support and fix the compound lens in alignment with the basic objective lens when the compound lens is releasably coupled thereto, wherein when only one of the compound lenses lens is selected to be allocated on releasably coupled to the mounting seat, the optical scanner has a resolution corresponding to the selected releasably coupled compound lens, and when any one of the compound lenses lens is not connected coupled to the mounting seat, the image light is projected on the optical sensor via the basic object objective lens only.
2. The optical objective compound lens according to claim 1, wherein when the selected compound lens is coupled to the mounting seat, the compound lens is located on the optical path of the image light between the basic objective lens and the reflection compound mirror.
3. The optical objective compound lens according to claim 1, wherein when the selected compound lens is coupled to the mounting seat, the compound lens is allocated on the mounting seat, separating from non-contacting with the basic objective lens.
4. An optical scanner, comprising:
- a basic objective lens positioned to receive light and to project the received light onto an optical sensor; and
- a mounting seat configured to releasably couple a compound lens thereto, the mounting seat configured to support and fix the compound lens in alignment with the basic objective lens when the compound lens is releasably coupled thereto, wherein when the compound lens is releasably coupled to the mounting seat the light passes through both the basic objective lens and the compound lens before being projected onto the optical sensor, and when the compound lens is not coupled to the mounting seat the light does not pass through the compound lens before being projected onto the optical sensor.
5. The optical scanner of claim 4, wherein the optical scanner is configured to scan objects according to a first resolution range when the compound lens is releasably coupled to the mounting seat, and the optical scanner is configured to scan the objects according to a second resolution range when the compound lens is not coupled to the mounting seat, wherein the second resolution range is different than the first resolution range.
6. The optical scanner of claim 4, wherein when the compound lens is releasably coupled to the mounting seat, the compound lens is non-contacting with the basic objective lens.
7. The optical scanner of claim 4, wherein when the compound lens is releasably coupled to the mounting seat, a distance between the compound lens and the basic objective lens is fixed.
8. The optical scanner of claim 4, wherein when the compound lens is releasably coupled to the mounting seat, a position of the compound lens is fixed and non-moving relative to the basic objective lens.
9. An optical scanner, comprising:
- means for focusing light to be projected onto an optical sensor; and
- means for mounting a compound light focusing component in alignment with the light focusing means, wherein the means for mounting is configured to releasably affix the compound light focusing component thereto, such that the mounted compound light focusing component is readily interchangeable with other compound light focusing components;
- wherein the means for mounting is positioned in the optical scanner, such that when the compound light focusing component is releasably affixed to the means for mounting the light is focused by both the means for light focusing and the compound light focusing component before being projected onto the optical sensor, and when the compound light focusing component is not affixed to the means for mounting, the light is focused by the means for light focusing and not the compound light focusing component.
10. The optical scanner of claim 9, wherein the optical scanner is configured to scan objects according to a first resolution range when the compound light focusing component is releasably affixed to the means for mounting, and the optical scanner is configured to scan the objects according to a second different resolution range when the compound light focusing component is not affixed to the means for mounting.
11. The optical scanner of claim 10, wherein the optical scanner is configured to scan the objects according to a third resolution range when another compound light focusing component is releasably affixed to the means for mounting.
Type: Grant
Filed: Jul 1, 2005
Date of Patent: Sep 14, 2010
Inventor: Chih-Wen Huang (Hsinchu City 300)
Primary Examiner: James Phan
Attorney: Stolowitz Ford Cowger LLP
Application Number: 11/174,416
International Classification: G02B 26/08 (20060101);