US5047625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system of laser beam reader
Assignee: Pentax Corp
•
Filing: 1990-02-02
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Granted: 1991-09-10
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Expires: 2010-02-02
Abstract
Abstract An optical system of a laser reader has a light projecting portion for emitting a laser beam of light converging toward an object, a condenser lens for condensing a reflecting light from the object and a light receiving element for detecting light quantity of the reflecting light condensed by the condenser lens. The optical axis of the light projecting portion and that of the condenser lens are substantially parallel within a readable range which is established by a relation between a spatial frequency of the object and a spot diameter of the laser beam of light.
Inventors
- 👤 Mitsunori Iima
- 👤 Seiich Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:04
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/024; H04N1/028; G; G06; G06K; G06K7/00; G06K7/10; G06K7/10544; G06K7/10712; G06K7/10762; H04N1/029
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
126 words
An optical system of a laser beam reader comprising: a light projecting portion having an optical axis for projecting a laser beam of light along an optical path toward an object; a condenser lens located in said optical path and having a transmitting portion for permitting the projected beam of light to pass therethrough without changing the direction of the projected beam of light, said condenser lens having a condensing portion for condensing light reflected from the object; and a light receiving element for detecting the light quantity of a condensed light reflected from the object; an optical axis of said condenser lens being spaced from said optical axis of said light projecting portion in such a manner that they are generally parallel with each other.
Claim 2
Dependent Claim
126 words
An optical system of a laser beam reader comprising: a light projecting portion having an optical axis for projecting a laser beam of light along an optical path toward an object; a condenser lens located in said optical path and having a transmitting portion for permitting the projected beam of light to pass therethrough without changing the direction of the projected beam of light, said condenser lens having a condensing portion for condensing light reflected from the object; and a light receiving element for detecting the light quantity of a condensed light reflected from the object; an optical axis of said condenser lens being spaced from said optical axis of said light projecting portion in such a manner that they are generally parallel with each other.
Claim 3
Dependent Claim
60 words
An optical system of a laser beam reader according to claim 1, wherein said light receiving element is located in a position generally conjugate with a distant limit of a readable range of an object, said readable range being determined by the relation between a spatial frequency of the object and a spot diameter of the laser beam of light.
Claim 4
Dependent Claim
26 words
An optical system of a laser beam reader according to claim 1, wherein said transmitting portion is located at a central portion of said condenser lens.
Claim 5
Dependent Claim
40 words
An optical system of a laser beam reader according to claim 1, wherein said condenser lens is an aspheric lens having a radius of curvature which becomes larger as it approaches a circumferential portion of the center of said lens.
Claim 6
Dependent Claim
31 words
An optical system of a laser beam reader according to claim 1, wherein said condenser lens is a rotation asymmetric lens produced by cutting a part of a rotation symmetric lens.
Claim 7
Dependent Claim
34 words
An optical system of a laser beam reader according to claim 5, wherein said condenser lens is formed with an engaging portion for determining the position of said lens with respect to a casing.
Claim 8
Dependent Claim
23 words
An optical system of a laser beam reader according to claim 6, wherein said engaging portion is integrally formed with said condenser lens.
Claim 9
Dependent Claim
23 words
An optical system of a laser beam reader according to claim 1, wherein said transmitting portion has a refractive power of substantially zero.
Claim 10
Dependent Claim
19 words
An optical system of a laser beam reader according to claim 8, wherein said transmitting portion is an opening.
Claim 11
Dependent Claim
24 words
An optical system of a laser beam reader according to claim 1, wherein said optical path intersects said condenser lens at said transmitting portion.
Claim 12
Dependent Claim
82 words
An optical system of a laser beam reader comprising: (a) means for projecting a laser beam along an optical path toward and object; (b) a condenser lens located in said optical path, said condenser lens including means for permitting a light beam to pass therethrough without changing direction, wherein said means for projecting a laser beam has a first optical axis, and said condenser lens has a second optical axis, said first and second optical axes being substantially parallel to each other.
Claim 13
Dependent Claim
82 words
An optical system of a laser beam reader comprising: (a) means for projecting a laser beam along an optical path toward and object; (b) a condenser lens located in said optical path, said condenser lens including means for permitting a light beam to pass therethrough without changing direction, wherein said means for projecting a laser beam has a first optical axis, and said condenser lens has a second optical axis, said first and second optical axes being substantially parallel to each other.
Claim 14
Dependent Claim
25 words
An optical system of a laser beam reader according to claim 11, including a light receiving element for detecting condensed light reflected from the object.
Claim 15
Dependent Claim
33 words
An optical system of a laser beam reader according to claim 11, wherein said means for permitting a light beam to pass is located at a substantially central portion of said condenser lens.
Claim 16
Dependent Claim
20 words
An optical system of a laser beam reader according to claim 11, wherein said condenser lens is an aspheric lines.
Claim 17
Dependent Claim
20 words
An optical system of a laser beam reader according to claim 11, wherein said condenser lens is an asymmetric lens.
Claim 18
Dependent Claim
29 words
An optical system of a laser beam reader according to claim 11, wherein said means for projecting a laser beam includes a laser diode and a light projecting lens.
Claim 19
Dependent Claim
38 words
An optical system of a laser beam reader according to claim 12, wherein said condenser lens includes means to change the path of reflected light so that the reflected light can be received by said light receiving element.
Claim 20
Dependent Claim
29 words
An optical system of a laser beam reader according to claim 11, further comprising a casing for holding said means for projecting a laser beam and said condenser lens.
Claim 21
Dependent Claim
53 words
An optical system of a laser beam reader according to claim 18, wherein said casing includes a central portion, a front end portion connected to said central portion at one end of said central portion and a rear end portion connected to the central portion of the other end of said central portion.
Claim 22
Dependent Claim
31 words
An optical system of a laser beam reader according to claim 19, wherein said front end portion and said rear end portion are connected to said central portion by threaded connections.
Claim 23
Dependent Claim
31 words
An optical system of a laser beam reader according to claim 19, further comprising a holding frame connected to said central portion for holding said means for projecting a laser beam.
Claim 24
Dependent Claim
23 words
An optical system of a laser beam reader according to claim 21, further comprising a light projecting lens held by said holding frame.
Claim 25
Dependent Claim
30 words
An optical system of a laser beam reader according to claim 22, further comprising a diaphragm adjacent to said light projecting lens for limiting the diameter of the laser beam.
Claim 26
Dependent Claim
23 words
An optical system of a laser beam reader according to claim 19, further including a light receiving element secured to said central portion.
Claim 27
Dependent Claim
35 words
An optical system of a laser beam reader according to claim 24, including a light receiving element holder secured to said central portion, said light receiving element being secured to said light receiving element holder.
Claim 28
Dependent Claim
35 words
An optical system of a laser beam reader according to claim 25, wherein said light receiving element holder includes a opening to permit the laser beam projected from said means for projecting to pass therethrough.
Claim 29
Dependent Claim
39 words
An optical system of a laser beam reader according to claim 18, wherein said casing includes an inner wall with a hole, and said condenser lens includes a projection adapted to engage said hole for positioning said condenser lens.
Claim 30
Dependent Claim
25 words
An optical system of a laser beam reader according to claim 27, wherein said projection is formed on a circumferential portion of said condenser lens.
Claim 31
Dependent Claim
27 words
An optical system of a laser beam reader according to claim 27, wherein said condenser lens is a plastic lens, with said projection being integrally formed therewith.
Claim 32
Dependent Claim
30 words
An optical system of a laser beam reader according to claim 11, wherein said means for permitting a light beam to pass therethrough has a refractive power of substantially zero.
Claim 33
Dependent Claim
26 words
An optical system of a laser beam reader according to claim 30, wherein said means for permitting a light beam to pass therethrough is an opening.
Claim 34
Dependent Claim
105 words
An optical system of a laser beam reader comprising: a light projecting portion having an optical axis for projecting a laser beam of light along an optical path toward an object; a condenser lens located in said optical path and having a transmitting portion for permitting the projected beam of light to pass therethrough without changing the direction of the projected beam of light, from said light projection portion to said optical axis, said condenser lens having a condensing portion for condensing light reflected from the object; and a light receiving element for detecting the light quantity of a condensed light reflected from the object.
Claim 35
Dependent Claim
105 words
An optical system of a laser beam reader comprising: a light projecting portion having an optical axis for projecting a laser beam of light along an optical path toward an object; a condenser lens located in said optical path and having a transmitting portion for permitting the projected beam of light to pass therethrough without changing the direction of the projected beam of light, from said light projection portion to said optical axis, said condenser lens having a condensing portion for condensing light reflected from the object; and a light receiving element for detecting the light quantity of a condensed light reflected from the object.
Claim 36
Dependent Claim
26 words
An optical system of a laser beam reader according to claim 32, wherein said transmitting portion is located at a central portion of said condenser lens.
Claim 37
Dependent Claim
40 words
An optical system of a laser beam reader according to claim 32, wherein said condenser lens is an aspheric lens having a radius of curvature which becomes larger as it approaches a circumferential portion of the center of said lens.
Claim 38
Dependent Claim
20 words
An optical system of a laser beam reader according to claim 32, wherein said condenser lens is an asymmetric lens.
Claim 39
Dependent Claim
29 words
An optical system of a laser beam reader according to claim 32, wherein said portion for projecting a laser beam includes a laser diode and a light projecting lens.
Claim 40
Dependent Claim
29 words
An optical system of a laser beam reader according to claim 32, further comprising a casing for holding said portion for projecting a laser beam and said condenser lens.
Claim 41
Dependent Claim
23 words
An optical system of a laser beam reader according to claim 32, wherein said transmitting portion has a refractive power of substantially zero.
Claim 42
Dependent Claim
19 words
An optical system of a laser beam reader according to claim 38, wherein said transmitting portion is an opening.
Claim 43
Dependent Claim
24 words
An optical system of a laser beam reader according to claim 32, wherein said optical path intersects said condenser lens at said transmitting portion.
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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) | 1994-09-09 | 1995-03-11 | 1995-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-09 | 1999-03-11 | 1999-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-09 | 2003-03-11 | 2003-09-10 | $7700.00 | Window Closed / Lapsed |