Patent US4995709A successfully refreshed from Google Patents.
US4995709A
Expired / Lapsed
US
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Optical collimator
Assignee: Mitsubishi Electric Corp
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Filing: 1989-07-05
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Granted: 1991-02-26
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Expires: 2009-07-05
Abstract
Abstract An optical collimator having a collimator lens which is divided into front and rear collimator lenses. An inclined transparent parallel plate is located between the two collimator lenses, whereby the optical collimator is substantially free from comatic aberration and results in a collimator which can be reduced in size.
Inventors
- 👤 Kazuo Iwata
- 👤 Takuma Satou
- 👤 Satoru Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:29
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/0025; G02B19/00; G02B19/0004; G02B19/0009; G02B19/0014; G02B19/0033; G02B19/0047; G02B19/0052; G02B27/09; G02B27/0938; G02B27/095; G02B27/0972
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
80 words
An optical collimator for converting rays of light outputted by a light source into substantially parallel rays of light, comprising: front and rear collimator lenses obtained by dividing one collimator lens into two relatively smaller lenses, thereby reducing the angle of divergence of light between said front and rear collimator lenses; and an inclined transparent parallel flat plate held between said front and rear collimator lenses thereby reducing astigmatism. whereby an optical collimator structure of reduced size can be provided.
Claim 2
Dependent Claim
80 words
An optical collimator for converting rays of light outputted by a light source into substantially parallel rays of light, comprising: front and rear collimator lenses obtained by dividing one collimator lens into two relatively smaller lenses, thereby reducing the angle of divergence of light between said front and rear collimator lenses; and an inclined transparent parallel flat plate held between said front and rear collimator lenses thereby reducing astigmatism. whereby an optical collimator structure of reduced size can be provided.
Claim 3
Dependent Claim
18 words
The optical collimator of claim 1, wherein said flat plate is comprised of a single piece of glass.
Claim 4
Dependent Claim
25 words
The optical collimator of claim 1, wherein said flat plate is composed of a pair of glass plates which are inclined relative to each other.
Claim 5
Dependent Claim
36 words
The optical collimator of claim 3, wherein said pair of glass plates are inclined in mutually opposite directions at substantially the same angle relative to a central longitudinal axis passing through said front and rear lenses.
Claim 6
Dependent Claim
24 words
The optical collimator of claim 1 wherein the diameter of said front collimator lens is less than the diameter of said rear collimator lens.
Claim 7
Dependent Claim
25 words
The optical collimator of claim 1 wherein the diameter of said front and rear lenses is less than the diameter of said one collimator lens.
Claim 8
Dependent Claim
51 words
The optical collimator of claim 6 wherein the diameter of said front collimator lens is less than the diameter of said rear collimator lens and wherein said front collimator lens operates as an input lens for said light and said rear collimator lens operates as an output lens for said light.
Claim 9
Dependent Claim
26 words
The optical collimator of claim 7 wherein said glass plate and said rear collimator lens are located within the focal length of said front collimator lens.
Claim 10
Dependent Claim
25 words
The optical collimator of claim 8 wherein said flat plate is comprised of a pair of glass plates which are inclined relative to each other.
Claim 11
Dependent Claim
36 words
The optical collimator of claim 9 wherein said pair of glass plates are inclined in mutually opposite directions at substantially the same angle relative to a central longitudinal axis passing through said front and rear lenses.
References Cited (Backward Citations)
DE2359104A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-25 | 1994-08-27 | 1995-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-25 | 1998-08-27 | 1999-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-25 | 2002-08-27 | 2003-02-26 | $7700.00 | Window Closed / Lapsed |