US4918702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser unit
Assignee: Canon Inc
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Filing: 1988-11-29
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Granted: 1990-04-17
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Expires: 2008-11-29
Abstract
Abstract A laser unit includes a laser source for emitting a laser beam, a collimator lens for collimating the laser beam emitted from the laser source, a supporting member, made of a good thermal conductivity material, for supporting the laser source, and a heat insulating layer disposed between the supporting member and the collimator lens.
Inventors
- 👤 Akiyoshi Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:48
CPC Classifications
H; H01; H01S; H01S5/00; H01S5/02; H01S5/022; H01S5/02208; B; B41; B41J; B41J2/00; B41J2/435; B41J2/47; B41J2/471; G; G02; G02B; G02B6/00; G02B6/24; G02B6/42; G02B6/4201; G02B6/4204; H01S5/0225; H01S5/02253; H01S5/024
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
70 words
A laser unit, comprising: a first unit having a laser source for emitting laser beam, said first unit being made of a high thermal conductivity material to absorb heat from said laser source; and a second unit having a collimator lens for collimating the laser beam emitted from said laser source, said second unit having a low thermal conductivity material for thermally insulating the collimator lens from said first unit.
Claim 2
Dependent Claim
70 words
A laser unit, comprising: a first unit having a laser source for emitting laser beam, said first unit being made of a high thermal conductivity material to absorb heat from said laser source; and a second unit having a collimator lens for collimating the laser beam emitted from said laser source, said second unit having a low thermal conductivity material for thermally insulating the collimator lens from said first unit.
Claim 3
Dependent Claim
17 words
A unit according to claim 1, wherein said low thermal conductivity material is made of resin material.
Claim 4
Dependent Claim
16 words
A unit according to claim 1, wherein said low thermal conductivity material is of ceramic material.
Claim 5
Dependent Claim
20 words
A unit according to claim 1, wherein said low thermal conductivity material constitutes a lens barrel for said collimator lens.
Claim 6
Dependent Claim
26 words
A unit according to claim 1, further comprising a supporting member for supporting said first unit, wherein said supporting member is of high thermal conductivity material.
Claim 7
Dependent Claim
30 words
A unit according to claim 1, wherein said laser source is in the form of a laser package containing a laser emitting chip and provided with a laser emitting window.
Claim 8
Dependent Claim
19 words
A unit according to claim 6, wherein a gap is provided between said laser package and said collimator lens.
Claim 9
Dependent Claim
25 words
A unit according to claim 1, wherein the laser beam emitted from said laser unit is deflected by deflecting means to scan a photosensitive member.
Claim 10
Dependent Claim
69 words
A laser unit, comprising: a laser source for emitting a laser beam; a collimator lens for collimating a laser beam emitted from said laser source; supporting means for integrally supporting said laser source and said collimator lens with a gap therebetween, said supporting means is at least partly made of resin material, into which filler material is mixed to prevent or reduce change of the gap due to heat.
Claim 11
Dependent Claim
69 words
A laser unit, comprising: a laser source for emitting a laser beam; a collimator lens for collimating a laser beam emitted from said laser source; supporting means for integrally supporting said laser source and said collimator lens with a gap therebetween, said supporting means is at least partly made of resin material, into which filler material is mixed to prevent or reduce change of the gap due to heat.
Claim 12
Dependent Claim
25 words
A unit according to claim 9, wherein the filler material has a linear thermal expansion coefficient which is smaller than that of the resin material.
Claim 13
Dependent Claim
29 words
A unit according to claim 9, wherein said supporting means includes a lens barrel for accommodating said collimator lens, and wherein the lens barrel is of the resin material.
Claim 14
Dependent Claim
30 words
A unit according to claim 9, wherein said laser source is in the form of a laser package containing a laser emitting chip and provided with a laser emitting window.
Claim 15
Dependent Claim
22 words
A unit according to claim 9, wherein the laser beam emitted from said laser unit is deflected to scan a photosensitive member.
Claim 16
Dependent Claim
23 words
A unit according to claim 9, wherein said supporting means is of zinc die-cast in the portion other than those of resin material.
Claim 17
Dependent Claim
33 words
A unit according to claim 9, wherein the direction of the flow of molecules of the resin material and the filler material is substantially perpendicular to the optical axis of the laser beam.
Claim 18
Dependent Claim
33 words
A unit according to claim 9, wherein the direction of the flow of molecules of the resin material and the filler material is substantially parallel with the optical axis of the laser beam.
Claim 19
Dependent Claim
57 words
A laser unit, comprising: a laser source for emitting a laser beam; a collimator lens for collimating a laser beam emitted from said laser source; a lens barrel for accommodating said collimator lens, wherein said barrel is of resin material and has a integrally molded aperture stop for defining a spot shape provided by the laser beam.
Claim 20
Dependent Claim
57 words
A laser unit, comprising: a laser source for emitting a laser beam; a collimator lens for collimating a laser beam emitted from said laser source; a lens barrel for accommodating said collimator lens, wherein said barrel is of resin material and has a integrally molded aperture stop for defining a spot shape provided by the laser beam.
Claim 21
Dependent Claim
15 words
A unit according to claim 17, wherein the aperture of the aperture stop is oval.
Claim 22
Dependent Claim
23 words
A unit according to claim 18, wherein said barrel is further provided with an integrally molded stopper for preventing rotation of said barrel.
Claim 23
Dependent Claim
30 words
A unit according to claim 17, wherein said laser source is in the form of a laser package containing a laser emitting chip and provided with a laser emitting window.
Claim 24
Dependent Claim
19 words
A unit according to claim 17, wherein a gap is provided between said laser package and said collimator lens.
Claim 25
Dependent Claim
25 words
A unit according to claim 17, wherein the laser beam emitted from said laser unit is deflected b deflecting means to scan a photosensitive member.
Claim 26
Dependent Claim
47 words
A laser unit, comprising: a laser source for emitting a laser beam; a collimator lens for collimating the laser beam emitted from said laser source; and a lens barrel for accommodating said collimator lens, the barrel being of an insulative member into which magnetic material is added.
Claim 27
Dependent Claim
47 words
A laser unit, comprising: a laser source for emitting a laser beam; a collimator lens for collimating the laser beam emitted from said laser source; and a lens barrel for accommodating said collimator lens, the barrel being of an insulative member into which magnetic material is added.
Claim 28
Dependent Claim
15 words
A unit according to claim 23, wherein said insulating member is made of resin material.
Claim 29
Dependent Claim
15 words
A unit according to claim 2, wherein said heat insulating member is of ceramic material.
Claim 30
Dependent Claim
22 words
A unit according to claim 23, wherein a longitudinal end of said lens barrel remote from said laser source is magnetically attractable.
Claim 31
Dependent Claim
13 words
A unit according to claim 23, wherein the filler material is ferrite particles.
Claim 32
Dependent Claim
30 words
A unit according to claim 23, wherein said laser source is in the form of a laser package containing a laser emitting chip and provided with a laser emitting window.
Claim 33
Dependent Claim
19 words
A unit according to claim 23, wherein a gap is provided between said laser package and said collimator lens.
Claim 34
Dependent Claim
25 words
A unit according to claim 23, wherein the laser beam emitted from said laser unit is deflected by deflecting means to scan a photosensitive member.
Claim 35
Dependent Claim
27 words
A unit according to claim 23, further comprising a holder having an accommodating portion extending in a direction of an optical axis to accommodate said lens barrel.
Claim 36
Dependent Claim
55 words
A laser unit, comprising: a laser source for emitting a laser beam; a collimator lens for collimating the laser beam emitted from said laser source; a lens barrel for accommodating said collimator lens, the lens barrel being of heat insulative material; and magnetic metal member fixed to said lens barrel of the heat insulative material.
Claim 37
Dependent Claim
55 words
A laser unit, comprising: a laser source for emitting a laser beam; a collimator lens for collimating the laser beam emitted from said laser source; a lens barrel for accommodating said collimator lens, the lens barrel being of heat insulative material; and magnetic metal member fixed to said lens barrel of the heat insulative material.
Claim 38
Dependent Claim
26 words
A unit according to claim 32, wherein the magnetic metal member is fixed to a longitudinal end of said lens barrel remote from said laser source.
Claim 39
Dependent Claim
16 words
A unit according to claim 32, wherein magnetic material is fixed into the heat insulative material.
Claim 40
Dependent Claim
15 words
A unit according to claim 32, wherein said insulating member is made of resin material.
Claim 41
Dependent Claim
15 words
A unit according to claim 32, wherein said heat insulating member is of ceramic material.
Claim 42
Dependent Claim
30 words
A unit according to claim 32, wherein said laser source is in the form of a laser package containing a laser emitting chip and provided with a laser emitting window.
Claim 43
Dependent Claim
19 words
A unit according to claim 32, wherein a gap is provided between said laser package and said collimator lens.
Claim 44
Dependent Claim
25 words
A unit according to claim 32, wherein the laser beam emitted from said laser unit is deflected by deflecting means to scan a photosensitive member.
Claim 45
Dependent Claim
27 words
A unit according to claim 32, further comprising a holder having an accommodating portion extending in a direction of an optical axis to accommodate said lens barrel.
Claim 46
Dependent Claim
18 words
A unit according to claim 40, wherein said lens barrel is bonded and fixed to the accommodating portion.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-16 | 1993-10-16 | 1994-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-16 | 1997-10-16 | 1998-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-16 | 2001-10-16 | 2002-04-17 | $7700.00 | Window Closed / Lapsed |