Imaging apparatus having imaging lens
First Claim
Patent Images
1. An imaging apparatus comprising:
- an imaging assembly including an imaging lens and an image sensor array, the imaging assembly defining a field of view, the image sensor array having a plurality a pixels, the plurality of pixels including color sensitive pixels having wavelength selective color filter elements;
an illumination assembly that, during a frame exposure period of the imaging assembly simultaneously projects on a target light within the blue wavelength band, the green wavelength band and the red wavelength band;
wherein the imaging lens is a two element glass imaging lens, the imaging lens having a first glass lens element and a second glass element;
wherein the imaging apparatus captures a frame of image data representing light incident of the image sensor array during an exposure period; and
wherein the imaging apparatus includes a pass band filter that selectively passes light within first second and third pass bands, the first pass band being defined in the blue wavelength band, the second pass band being defined in the green wavelength band, the third pass band being defined in the red wavelength band;
wherein the imaging apparatus processes the frame of image data for attempting to decode decodable; and
wherein the imaging lens has a chromatic aberration to effective focal length ratio of less than 0.025.
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Abstract
There is set forth herein in one embodiment an imaging apparatus having an imaging assembly and an illumination assembly. The imaging assembly can comprise an imaging lens and an image sensor array. The illumination assembly can include a light source bank having one or more light source. The imaging assembly can define a field of view on a substrate and the illumination assembly can project light within the field of view. The imaging apparatus can be configured so that the illumination assembly during an exposure period of the imaging assembly emits light that spans multiple visible color wavelength bands.
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Citations
20 Claims
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1. An imaging apparatus comprising:
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an imaging assembly including an imaging lens and an image sensor array, the imaging assembly defining a field of view, the image sensor array having a plurality a pixels, the plurality of pixels including color sensitive pixels having wavelength selective color filter elements; an illumination assembly that, during a frame exposure period of the imaging assembly simultaneously projects on a target light within the blue wavelength band, the green wavelength band and the red wavelength band; wherein the imaging lens is a two element glass imaging lens, the imaging lens having a first glass lens element and a second glass element; wherein the imaging apparatus captures a frame of image data representing light incident of the image sensor array during an exposure period; and wherein the imaging apparatus includes a pass band filter that selectively passes light within first second and third pass bands, the first pass band being defined in the blue wavelength band, the second pass band being defined in the green wavelength band, the third pass band being defined in the red wavelength band; wherein the imaging apparatus processes the frame of image data for attempting to decode decodable; and wherein the imaging lens has a chromatic aberration to effective focal length ratio of less than 0.025. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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defining first second and third configurations, wherein the first second and third configurations are defined to match first second and third pass bands of a multiple pass band filter; defining a fourth configuration having first second and third wavelengths, respectively, within the first second and third pass bands; providing an imaging lens by establishing merit functions within the four configurations to seek an optimized solution for the first, second and third pass bands; wherein the imaging lens has a chromatic aberration to effective focal length ratio of less than 0.025. - View Dependent Claims (16, 17)
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18. A method for reducing chromatic aberrations of an imaging lens having first and second lens elements and a chromatic aberration to effective focal length ratio of less than 0.025, the method comprising two or more of (a) through (h);
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(a) increasing a curvature of a light entry; (b) increasing a curvature of a light exit surface of the first lens element; (c) increasing a curvature of a light entry surface of the second lens element; (d) increasing a curvature of a light exit surface of the second lens element; (e) decreasing an index of refraction of the first lens element; (f) decreasing an index of refraction of the second lens element; (g) increasing a V number of the first lens element; (h) increasing a V number of the second lens element. - View Dependent Claims (19, 20)
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Specification