ADD-ON DEVICE WITH CONFIGURABLE OPTICS FOR AN IMAGE SCANNER FOR SCANNING BARCODES

FIELD OF THE INVENTION

The present invention relates image scanners for scanning barcodes, and in particular to an add-on device with configurable optics for various decoding applications.

BACKGROUND

Generally speaking, currently there are imaging scanner products of three types. Each is specific to a range application and is defined by the lens used in the imaging scanner.

For example, for general-purpose applications an imaging scanner uses a standard range (SR) lens. A high-density lens (HD) with focus at a near range is used for the best performance in the near range to read fine pitch high-density codes. Extended range (ER) lenses with longer focal lengths and a narrower field of view are used when there is a need to extend the working range of the imaging scanner.

In each case, a different scanner is required. In some applications, different types of barcodes need to be read within the same work area, resulting in the need for multiple scanners at one location.

Therefore, a need exists for a unified scanner with multi-field of view and multi-focus capability, while using the minimum components at the lowest cost.

SUMMARY

Accordingly, in one aspect, the present invention embraces an add-on device for an image scanner for scanning barcodes. The image scanner is provided with a standard range lens, having a lens front and an optical axis.

In an exemplary embodiment, an add-on device for the image scanner for scanning barcodes includes a housing, and a lens holder. The housing is mounted to the standard range lens front on the image scanner. The lens holder is provided with a first position for holding a first lens, second position with an aperture, and a third position for holding a second lens. A high-density lens is mounted in the first position. An extended range lens mounted in the third position. The lens holder is mounted in the housing and transverse to the optical axis of the image scanner. Further, the lens holder is movable within the housing to alternately position the high-density lens, the aperture, and the extended range lens to be in alignment with the optical axis of the standard range lens of the image scanner.

In another exemplary embodiment, the add-on device is further provided with a motor mounted to the housing. The motor is coupled to the lens holder. The motor is configured to move the lens holder within the housing to alternately position the high-density lens, the aperture, and the extended range lens to be in alignment with the optical axis of the standard range lens of the image scanner.

In another exemplary embodiment of the add-on device, the motor is provided with a threaded shaft. The lens holder is provided with a threaded receiver. The motor is coupled to the lens holder via the threaded shaft being received into the threaded receiver.

In yet another exemplary embodiment of the add-on device, the lens holder is rotatably movable in the housing.

In another exemplary embodiment of the add-on device, the lens holder is movable within the housing in a direction parallel to a surface on which the image scanner is disposed.

In another exemplary embodiment of the add-on device, the lens holder is movable within the housing in a direction perpendicular to a surface on which the image scanner is disposed.

In another exemplary embodiment of the add-on device, the extended range lens is a telescopic doublet lens.

In another exemplary embodiment of the add-on device, the high-density lens is a plano-convex lens.

In yet another exemplary embodiment of the add-on device, the extended range lens and the high-density lens are molded into the lens holder.

In another exemplary embodiment of the add-on device, the housing is provided with a sliding pin. The lens holder is provided with a receiver for the sliding pin. The lens holder is movably mounted to the housing when the sliding pin is received in the receiver.

In another exemplary embodiment of the add-on device, the first, second and third positions being in alignment with the optical axis of the standard range lens of the image scanner are predetermined positions. The lens holder is provided with mechanical stops for the predetermined positions within the housing.

In another exemplary embodiment of the add-on device, the motor is a micro dc motor.

In another exemplary embodiment of the add-on device, the motor is provided with a self-locking thread drive mechanism.

In another exemplary embodiment, the image scanner is provided with a laser aimer and an illuminator. The laser aimer, the illuminator, and the standard range lens are in a first linear relationship. The add-on device further includes an aimer lens. The lens holder is provided with an aimer lens holder. The aimer lens is disposed in the aimer lens holder. The aimer lens holder is in a second linear relationship with the third position. The first position, the second position, and the third position being in a third linear relationship. The second linear relationship is perpendicular to the third linear relationship. The second linear relationship corresponds to the first linear relationship, such that when the third position is in alignment with the optical axis of the image scanner, the aimer lens is in alignment with the laser aimer.

In another exemplary embodiment, the add-on device further includes an illuminator lens. The lens holder is provided with an illuminator lens holder. The illuminator lens is disposed in the illuminator lens holder. The illuminator lens holder is in the second linear relationship with the third position and the aimer lens holder. The second linear relationship corresponds to the first linear relationship such that when the third position is in alignment with the optical axis of the image scanner, the aimer lens is in alignment with the laser aimer, and the illuminator lens is in alignment with the illuminator.

In yet another exemplary embodiment of the add-on device, the first position is provided to hold more than one lens, and the high-density lens is comprised of more than one lens.

In another exemplary embodiment of the add-on device, the third position is provided to hold more than one lens, and the extended range lens comprised of more than one lens.

In another exemplary embodiment of the add-on device, the first position, the second position, and the third position are adapted to additionally hold at least one filter.

In another exemplary embodiment of the add-on device, the at least one filter is selected from ultraviolet light filters, near infrared filters, polarization filters, filters with combinations of optimized spectrum and polarization.

In another exemplary embodiment of the add-on device, the extended range lens is selected from and a liquid lens, a liquid crystal lens, and a telescopic doublet lens.

The foregoing illustrative summary, as well as other exemplary objectives and/or advantages of the invention, and the manner in which the same are accomplished, are further explained within the following detailed description and its accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically depicts an image scanner generally of one of the type, which can be used with the invention.

FIG. 2 schematically depicts an exemplary embodiment of the invention with a horizontally movable lens holder in the first position.

FIG. 3 schematically depicts another position of the exemplary embodiment of FIG. 2 with the horizontally movable lens holder in the second position.

FIG. 4 schematically depicts another position of the exemplary embodiment of FIG. 2 with the horizontally movable lens holder in the third position.

FIG. 5 schematically depicts another exemplary embodiment of the invention with a vertically movable lens holder in the first position and optional attachments.

FIG. 6 schematically depicts another position of the exemplary embodiment of FIG. 5 the vertically movable lens holder in the second position.

FIG. 7 schematically depicts another position of the exemplary embodiment of FIG. 5 with the vertically movable lens holder in the third position.

FIG. 8 schematically depicts in an expanded view another exemplary embodiment of the invention having a rotatably movable lens holder.

DETAILED DESCRIPTION

The present invention embraces an add-on device for an image scanner for scanning barcodes. Referring to FIG. 1, a typical image scanner (10) for use with the present invention, is provided with a standard range lens (11), with a lens front (12), and an optical axis (13), depicted by the arrow extending from the standard range lens (11). The image scanner (10) may also be provided with a laser aimer (14) and an illuminator (15). In the foregoing figures, an image scanner (10) as depicted in FIG. 1 is used as the basis of the add-on device, although other image scanner configurations are possible.

An exemplary embodiment of the add-on device for the image scanner is depicted in FIGS. 2-4. The add-on device (20) includes a housing (22). The housing (22) is mounted to the standard range lens front (not shown in this figure) on the image scanner (10). The add-on device (20) further includes a lens holder (24) with a first position (25) for holding a first lens, second position (26) with an aperture, and a third position (27) for holding a second lens. A high-density lens (28) is mounted in the first position (25). An extended range lens (29) is mounted in the third position (27). The lens holder (24) is mounted in the housing (22) transverse to the optical axis (23) of the image scanner (10). The lens holder (24) is movable within the housing (22) to alternately position the high density lens (28), the aperture (26), and the extended range lens (29) to be in alignment with the optical axis (13), depicted hereinafter by the crosshairs over the lens position, of the standard range lens (11) of the image scanner (10). In the present FIG. 2, the high-density lens (28) is positioned and aligned with optical axis (13) of the standard range lens (11). FIG. 3 depicts the second position (26) with the aperture aligned with the optical axis (13) of the standard range lens (11). FIG. 4 depicts the extended range lens (29) aligned with the optical axis (13) of the standard range lens (11).

In another exemplary embodiment, also depicted in FIGS. 2-4, the add-on device (20) is provided with a motor (31) mounted to the housing (22). The motor (31), for example may be a micro dc motor. The motor (31) can alternately position the high-density lens (28), the aperture (26), and the extended range lens (29) in alignment with the optical axis (13) of the standard range lens (11) as depicted in FIGS. 2, 3, and 4 respectively.

In another exemplary embodiment, the motor (31) is provided with a threaded shaft (32), and the housing (22) is provided with a threaded receiver (33). In this way, the motor (31) can alternately align the positions with the optical axis (13) of the standard lens (11). Preferably, the motor (31) is provided with a self-locking thread mechanism, which allows the position of the lens holder (24) to be held accurately while the image scanner (10) is in use.

Further, the housing (22) may be provided with a sliding pin (34) which is received in a receiver (35) on the lens holder (24). The sliding pin assists in moving the lens holder (24) and helps keep the lens holder (24) in alignment with respect to the optical axis (13) of the standard range lens (11).

In the embodiments depicted in FIGS. 2-4, the lens holder (24) is movable within the housing (22) in a horizontal direction, that is, in a direction parallel to a surface (not shown) on which the image scanner (10) may be disposed.

FIGS. 5, 6, and 7 depict another exemplary embodiment of the add-on device (20) of the present invention where the lens holder (24) is movable within the housing (22) in a direction perpendicular to a surface on which the image scanner (10) may be disposed. The embodiments of FIGS. 5-7 generally have all the same features as described in connection with FIGS. 2-4. FIG. 5, which is a perspective view of the image scanner and add-on device, shows the high-density lens (28) in alignment with the optical axis (not shown in this figure) of the standard range lens, (not visible in the present figure.) FIG. 6, which depicts another view of the image scanner and add-on device of the invention, shows the aperture (26) in alignment with the optical axis (13) of the standard range lens (11) of the image scanner (10). FIG. 7, is similar in perspective to FIG. 6, but depicts the extended range lens (29) in alignment with the optical axis (13) of the standard range lens (11) of the image scanner (10).

In another exemplary embodiment as shown in FIGS. 5-7, the add-on device (20) is provided with an aimer lens (39) mounted in the lens holder (24) via an aimer lens holder (40). As shown particularly in FIG. 7, only when the extended range lens (29) is in alignment with the optical axis (13) of the standard range lens (11), is the aimer lens (39) positioned in front of the aimer (14) of the image scanner (10).

In another exemplary embodiment depicted in FIGS. 5-7, optionally, in addition to the aimer lens (39), the add-on device (20) may be provided with an illuminator lens (41) which is mounted in the lens holder (24) via an illuminator lens holder (42). As with the aimer lens (39), the illuminator lens (41) is only aligned with the illuminator (15) when the extended range lens (29) is in alignment with the optical axis (13) of the standard range lens (11).

The aimer lens (39), the illuminator lens (41), and the extended range lens (29) are generally in line with each other, forming a linear arrangement, which corresponds to the linear arrangement of the standard range lens (11), the aimer (14) and the illuminator (15).

In another exemplary embodiment, depicted in FIG. 8, the add-on device (20) is rotatably movable. As shown in the figure, the add-on device (20) has a housing (22) and a lens holder (24). A motor (31) with threaded shaft (32) is mounted on the housing (22) and moves the lens holder (24) rotatably. The housing (22) has an opening (21) which corresponds to the standard range lens on an image scanner. The image scanner not being shown in the present figure. The lens holder (24) is mounted to the housing (22) via a mounting pin (50). The lens holder (24) has positions to hold a high-density lens (28), and extended range lens (29) and an aperture (26). The motor shaft (32) is coupled to the lens holder (24) such that the lens can be rotated in front of the opening (21) in the housing and thus be aligned with the optical axis of the standard range lens on an image scanner.

The lens holder (24) is preferably provided with a motion limiter (23) which may also function as a mechanical stop.

In any of the forgoing embodiments in FIGS. 1-8, the positions of the lens and aperture being in alignment with the optical axis of the standard range lens may be considered predetermined positions. The lens holder in any of the foregoing embodiments may be provided with mechanical stops for these predetermined positions. While not depicted in FIGS. 2-7, the motion limiter (23) in FIG. 8, may function as a mechanical stop and the lens holder (24) may be provided with one or more mechanical stops.

FIG. 8 further depicts an additional extended range lens (43) to be held in the lens holder (24). In any of the foregoing embodiments depicted in FIGS. 2-8, the lens holder positions may be adapted to hold more than one lens, or other optical components such as ultraviolet light filters, near infrared filters, polarization filers, and filters with combinations of optimized spectrum and polarization.

Additionally, in any of the foregoing embodiments, the high-density lens is preferably a plano-convex lens, but may be comprised of more than one lens. The high-density lens may be molded into the lens holder.

Further, in any of the foregoing embodiments, the extended range lens is preferably a telescopic doublet lens. Additionally, the extended range lens may be a liquid lens, a liquid crystal lens, or a telescopic doublet lens. The extended range lens may be molded into the lens holder.

To supplement the present disclosure, this application incorporates entirely by reference the following commonly assigned patents, patent application publications, and patent applications:

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In the specification and/or figures, typical embodiments of the invention have been disclosed. The present invention is not limited to such exemplary embodiments. The use of the term “and/or” includes any and all combinations of one or more of the associated listed items. The figures are schematic representations and so are not necessarily drawn to scale. Unless otherwise noted, specific terms have been used in a generic and descriptive sense and not for purposes of limitation.

ADD-ON DEVICE WITH CONFIGURABLE OPTICS FOR AN IMAGE SCANNER FOR SCANNING BARCODES

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