US4897532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable laser diode scanning head
Assignee: Symbol Technologies LLC
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Filing: 1989-01-09
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Granted: 1990-01-30
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Expires: 2009-01-09
Abstract
Abstract A portable laser diode scanning head, aimable at each symbol to be read, emits and receives non-readily-visible laser light, and is equipped with a trigger-actuated aiming, light arrangement for visually locating and tracking each symbol. A compact laser diode optical train and an optical folded path assembly, as well as an interchangeable component design and an integral window construction for the head also are disclosed.
Inventors
- 👤 Jerome Swartz
- 👤 Howard M. Shepard
- 👤 Eric F. Barkan
- 👤 Mark J. Krichever
- 👤 Boris Metlitsky
- 👤 Edward Barkan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:08
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10821; G06K7/10881; G06K7/10554; G06K7/10594; G06K7/10603; G06K7/10633; G06K2207/00; G06K2207/1011
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
247 words
In a laser scanning system for reading symbols, a laser scanning head comprising: (a) means including an actuatable laser light source mounted in the head and operative, when actuated, for generating an incident laser beam; (b) optical means mounted in the head for optically directing said incident laser beam along a first optical path to a scanning mirror for reflection therefrom toward a reference plane located exteriorly of the head, and to a symbol located in a working distance range in the vicinity of the reference plane, thereby reflecting off the symbol reflected laser light, at least a returning portion of which travels along a second optical path away from the symbol back toward the head; (c) scanning means mounted in the head for moving the scanning mirror and for sweeping said incident laser beam in a scan across the symbol, said returning portion of said reflected laser light having a variable intensity over the scan; (d) sensor means mounted in the head for detecting the variable intensity of said returning portion of said reflected laser light over a field of view, and for generating an electrical analog signal indicative of the detected variable light intensity; and (e) a reciprocally oscillatable, generally concave mirror mounted with the scanning mirror for joint movement therewith and operative, when moved by the scanning means, for collecting said returning portion of said reflected laser light over the field of view, and for directing said collected returning portion to the sensor means.
Claim 2
Dependent Claim
247 words
In a laser scanning system for reading symbols, a laser scanning head comprising: (a) means including an actuatable laser light source mounted in the head and operative, when actuated, for generating an incident laser beam; (b) optical means mounted in the head for optically directing said incident laser beam along a first optical path to a scanning mirror for reflection therefrom toward a reference plane located exteriorly of the head, and to a symbol located in a working distance range in the vicinity of the reference plane, thereby reflecting off the symbol reflected laser light, at least a returning portion of which travels along a second optical path away from the symbol back toward the head; (c) scanning means mounted in the head for moving the scanning mirror and for sweeping said incident laser beam in a scan across the symbol, said returning portion of said reflected laser light having a variable intensity over the scan; (d) sensor means mounted in the head for detecting the variable intensity of said returning portion of said reflected laser light over a field of view, and for generating an electrical analog signal indicative of the detected variable light intensity; and (e) a reciprocally oscillatable, generally concave mirror mounted with the scanning mirror for joint movement therewith and operative, when moved by the scanning means, for collecting said returning portion of said reflected laser light over the field of view, and for directing said collected returning portion to the sensor means.
Claim 3
Dependent Claim
32 words
The head as defined in claim 1, further comprising signal processing means mounted in the head for processing the analog electrical signal, and for generating a processed signal indicative of the symbol.
Claim 4
Dependent Claim
70 words
The head as defined in claim 2 further comprising manually-actuatable trigger means on the head and operatively connected to, and operative for actuating, the scanning and concave mirrors, the laser beam generating means, the scanning means, to initiate a reading of the symbol upon manual actuation of the trigger means by the user, said trigger means being actuatable for each symbol to be read, each symbol in its respective turn.
Claim 5
Dependent Claim
65 words
The head as defined in claim 1, wherein the scanning mirror and the concave mirror are of one-piece construction, and include a plano-convex lens constituted of a light-transmissive material and having a first outer substantially planar surface and a second outer curved surface, a first light-reflecting layer applied over a part of the first surface, and a second light-reflecting layer applied over the second surface.
Claim 6
Dependent Claim
146 words
The head as defined in claim 1, wherein the incident laser beam is non-readily visible to a user; and further comprising means including an actuatable aiming light source mounted in the head and operative, when actuated, for generating an aiming light beam whose light is readily visible to the user; and aiming means mounted in the head for directing said aiming light beam along an aiming light path from the aiming light source toward the reference plane and to the symbol to visibly illuminate at least a part of the symbol, said aiming light path lying within at least one of said optical paths in the portion of the latter which lies exteriorly of the head; and wherein the concave mirror is also operative for focusing the aiming light beam and, when moved by the scanning means, for sweeping the aiming light beam over the symbol.
Claim 7
Dependent Claim
126 words
An optical component for use in optical scanning system of the type having a laser light source and a laser light sensor mounted in a lightweight handheld housing, and operative for reading indicia having parts of different light reflectivity, comprising; (a) a reciprocally oscillatable scanning mirror for reflecting light from the light source to the indicia parts in a scan across the indicia parts, thereby reflecting light of variable light intensity off the indicia parts; (b) a reciprocally oscillatable, generally concave collecting mirror for collecting at least a portion of the light reflected off the indicia parts, and for directing the collected portion of light to the light sensor; and (c) drive means for jointly, reciprocally and simultaneously oscillating the scanning mirror and the collecting mirror.
Claim 8
Dependent Claim
126 words
An optical component for use in optical scanning system of the type having a laser light source and a laser light sensor mounted in a lightweight handheld housing, and operative for reading indicia having parts of different light reflectivity, comprising; (a) a reciprocally oscillatable scanning mirror for reflecting light from the light source to the indicia parts in a scan across the indicia parts, thereby reflecting light of variable light intensity off the indicia parts; (b) a reciprocally oscillatable, generally concave collecting mirror for collecting at least a portion of the light reflected off the indicia parts, and for directing the collected portion of light to the light sensor; and (c) drive means for jointly, reciprocally and simultaneously oscillating the scanning mirror and the collecting mirror.
Claim 9
Dependent Claim
32 words
The component as recited in claim 6, wherein the collecting mirror has an optical axis, and wherein the scanning mirror is mounted on the collecting mirror radially offset from the optical axis.
Claim 10
Dependent Claim
21 words
The component as recited in claim 6, wherein the scanning mirror is smaller than, and is mounted on, the collecting mirror.
Claim 11
Dependent Claim
18 words
The component as recited in claim 6, wherein the scanning mirror is one-piece construction with the collecting mirror.
Claim 12
Dependent Claim
44 words
The component as recited in claim 6, wherein the scanning mirror has a front surface facing the light source and covered with a light-reflecting coating, and wherein the collecting mirror has a front surface facing the light sensor and covered with a light-reflecting coating.
Claim 13
Dependent Claim
67 words
The component as recited in claim 6, wherein the collecting mirror includes a plano-convex lens constituted of a light-transmissive material, said lens having a first outer substantially planar surface on a portion of which a first light-reflecting layer is coated to constitute the planar scanning mirror, and a second outer generally spherical surface on which a second light-reflecting layer is coated to constitute the concave collecting mirror.
Claim 14
Dependent Claim
26 words
The component as recited in claim 6, wherein the collecting mirror is a spherical mirror for focusing the collected portion of light onto the light sensor.
Claim 15
Dependent Claim
65 words
The component as recited in claim 6, wherein the oscillating means includes a scanner motor having an output shaft on which the scanning and collecting mirrors are mounted, said motor being operative for reciprocally and repetitively oscillating the shaft in alternate circumferential directions over arc lengths less than 360° and at a rate of speed on the order of a plurality of oscillating per second.
Claim 16
Dependent Claim
23 words
The component as recited in claim 6, wherein the light source is a laser source, and wherein the indicia constitute bar code symbols.
Claim 17
Dependent Claim
36 words
The head as described in claim 1 wherein the scanning means includes an electric motor having an output shaft, and said concave mirror and said scanning mirror are mounted for direct movement with said output shaft.
Claim 18
Dependent Claim
204 words
A lightweight, handheld laser scanner for reading bar code and generating electrical signals indicative thereof, comprising: (a) a housing having an area for passing laser light to the bar code and for receiving reflected laser light from the bar code; (b) a source of laser light in the housing; (c) a sensor in the housing for receiving said reflected laser light after it has been admitted through said area and for generating a first signal representative of said bar code; (d) a plurality of optical elements positioned in the housing generally defining an optical path between the source of laser light and said area of the housing and between said area and said sensor, the optical elements including (i) a reciprocally oscillable scanning mirror positioned for receiving laser emissions from the light source and sweeping them through said area across said bar code, and (ii) a reciprocally oscillable collecting mirror positioned for receiving said reflected laser light and reflecting it onto said sensor, said collecting mirror being generally concave, and said scanning mirror and said collecting mirror secured in a fixed physical relationship for joint movement with each other; and (e) drive means for reciprocally oscillating said scanning mirror and said collecting mirror jointly.
Claim 19
Dependent Claim
204 words
A lightweight, handheld laser scanner for reading bar code and generating electrical signals indicative thereof, comprising: (a) a housing having an area for passing laser light to the bar code and for receiving reflected laser light from the bar code; (b) a source of laser light in the housing; (c) a sensor in the housing for receiving said reflected laser light after it has been admitted through said area and for generating a first signal representative of said bar code; (d) a plurality of optical elements positioned in the housing generally defining an optical path between the source of laser light and said area of the housing and between said area and said sensor, the optical elements including (i) a reciprocally oscillable scanning mirror positioned for receiving laser emissions from the light source and sweeping them through said area across said bar code, and (ii) a reciprocally oscillable collecting mirror positioned for receiving said reflected laser light and reflecting it onto said sensor, said collecting mirror being generally concave, and said scanning mirror and said collecting mirror secured in a fixed physical relationship for joint movement with each other; and (e) drive means for reciprocally oscillating said scanning mirror and said collecting mirror jointly.
Claim 20
Dependent Claim
26 words
The scanner according to claim 16 wherein said scanning mirror is relatively smaller in size than said collecting mirror and is attached to said collecting mirror.
Claim 21
Dependent Claim
23 words
The scanner according to claim 16 and including signal processing circuitry in said head for processing said first signal into a digital signal.
Claim 22
Dependent Claim
12 words
The scanner according to claim 16 wherein the collecting mirror is spherical.
Claim 23
Dependent Claim
35 words
The scanner according to claim 16 and including a trigger supported by the housing and operatively connected to said laser light source and to said drive means for initiating the scanning of said bar code.
Claim 24
Dependent Claim
36 words
The scanner as described in claim 16 wherein the drive means includes an electric motor having an output shaft, and said concave mirror and said scanning mirror are mounted for direct movement with said output shaft.
Claim 25
Dependent Claim
158 words
In a lightweight handheld laser bar code scanner for reading bar code and generating electrical signals indicative thereof, wherein the bar code scanner defines a first optical path which includes laser light passing from a laser source to a scanning mirror to the bar code where the light is reflected in a second optical path which includes a generally concave collecting mirror for receiving the reflected light and passing it for impingement on a photosensor, wherein the scanner has drive means for reciprocally oscillating the scanning mirror and for reciprocally oscillating the collecting mirror, the method of directing the laser light in said optical paths, comprising the steps of: (a) mounting said collecting mirror and said scanning mirror in a fixed relationship with each other so that they move jointly with each other when reciprocally oscillated by said drive means, and (b) positioning said light source, said mirrors, and said photosensor in said first and second optical paths.
Claim 26
Dependent Claim
158 words
In a lightweight handheld laser bar code scanner for reading bar code and generating electrical signals indicative thereof, wherein the bar code scanner defines a first optical path which includes laser light passing from a laser source to a scanning mirror to the bar code where the light is reflected in a second optical path which includes a generally concave collecting mirror for receiving the reflected light and passing it for impingement on a photosensor, wherein the scanner has drive means for reciprocally oscillating the scanning mirror and for reciprocally oscillating the collecting mirror, the method of directing the laser light in said optical paths, comprising the steps of: (a) mounting said collecting mirror and said scanning mirror in a fixed relationship with each other so that they move jointly with each other when reciprocally oscillated by said drive means, and (b) positioning said light source, said mirrors, and said photosensor in said first and second optical paths.
Claim 27
Dependent Claim
19 words
The laser scanning head according to claim 1, wherein the incident laser beam is non-readily visible to a user.
Claim 28
Dependent Claim
20 words
The optical component according to claim 6 wherein the laser source generates light that is non-readily visible to a user.
Claim 29
Dependent Claim
22 words
The laser scanner according to claim 16 wherein the source of laser light generates light that is non-readily visible to a user.
Claim 30
Dependent Claim
20 words
The method of claim 22, wherein the laser light passing from a laser source is non-readily visible to a user.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |