Image sensor assembly for optical reader
First Claim
1. An apparatus for minimizing device-to-device variation in a target distance, d, defined by a distance between a target point, Ps, and an image sensor point, Pp, disposed on a pixel plane of an image sensor, the apparatus comprising:
- a component frame securing the image sensor, the frame having a proximal portion and a distal portion, said proximal portion closer than said distal portion to the target point Ps, said distal portion including an image sensor aperture, and said frame being adapted for receiving the image sensor in the distal portion of said frame; and
at least one image sensor plate disposed in the distal portion of said frame, said image sensor plate having a thickness, tp, and defining at least one side of said image sensor aperture at said distal portion of said frame, wherein said image sensor plate is contacted by the image sensor so that the image sensor is benched against said image sensor plate and at least a portion of the image sensor passes through said aperture in said frame, and wherein said image sensor plate thickness tp is tightly controlled so as to minimize device-to-device variation in distances.
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Accused Products
Abstract
According to the invention, a multilayered image sensor is back mounted to a plate, and the plate in turn, is installed in a holding pocket of a device. In that the scheme takes advantage of a high controllability of a mounting plate'"'"'s thickness, the mounting scheme provides a tight control of holding forces with which an image sensor is secured in an imaging device. In that the scheme provides for back mounting of image sensor on a planar surface, the mounting system provides tight control of an imaging assembly'"'"'s pixel plane to fixed point in space distance.
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Citations
20 Claims
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1. An apparatus for minimizing device-to-device variation in a target distance, d, defined by a distance between a target point, Ps, and an image sensor point, Pp, disposed on a pixel plane of an image sensor, the apparatus comprising:
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a component frame securing the image sensor, the frame having a proximal portion and a distal portion, said proximal portion closer than said distal portion to the target point Ps, said distal portion including an image sensor aperture, and said frame being adapted for receiving the image sensor in the distal portion of said frame; and
at least one image sensor plate disposed in the distal portion of said frame, said image sensor plate having a thickness, tp, and defining at least one side of said image sensor aperture at said distal portion of said frame, wherein said image sensor plate is contacted by the image sensor so that the image sensor is benched against said image sensor plate and at least a portion of the image sensor passes through said aperture in said frame, and wherein said image sensor plate thickness tp is tightly controlled so as to minimize device-to-device variation in distances. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An image sensor mounting system for reducing device-to-device fluctuations in a distance from a pixel plane to a fixed-point target, comprising:
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a component frame member;
an image sensor including a first planar member, a second planar member having a controllable thickness, a pixel array defining the pixel plane, and at least one lead frame, said first planar member disposed between said pixel array and said at least one lead frame and said second planar member oriented to form an outside surface of said image sensor;
an image sensor mounting member having a controllable thickness and disposed in fixed relation to the component frame member;
wherein the image sensor is mounted on the image sensor mounting member so that said second planar member of said image sensor is in rigid contact with said image sensor mounting member, and the distance from said image sensor pixel plane to the fixed-point target varies principally with the highly-controllable thickness of said second planar member and the controllable thickness of said image sensor mounting member. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification