US4836631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser scanning motor having a rotating polygonal mirror and method of manufacturing the same
Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1986-07-23
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Granted: 1989-06-06
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Expires: 2006-07-23
Abstract
Abstract A laser scanning motor includes a coreless flat brushless motor disposed in a rotatable polygonal mirror having polygonal outer mirror surfaces. A light beam applied to the polygonal mirror is deflected by controlling the rotation of the coreless flat brushless motor. Poles and a bearing holder of the coreless flat brushless motor in a rotor assembly are formed of a plastic magnetic material. When manufacturing the laser scanning motor, the poles and the bearing holder are formed simultaneously by filling the plastic magnetic material in one operation, and then firmly securing the poles and bearing holder to the rotor assembly.
Inventors
- 👤 Kikuo Shimazu
- 👤 Kazuo Suzuki
- 👤 Manabu Shiraki
- 👤 Osami Miyao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:37
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H02; H02K; H02K29/00; H02K29/06; H02K29/08; G; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B26/121; H02K29/14
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
76 words
A laser scanning motor having a rotatable polygonal outer mirror for deflecting a light beam incident thereon, said laser scanning motor comprising: a rotor assembly including a main portion supporting on a side thereof the rotatable mirror for deflecting said light beam; a brushless motor having poles made of a plastic magnetic material and mounted in said main portion; and a rotor yoke coupled between said main portion and said poles of said plastic magnetic material.
Claim 2
Dependent Claim
76 words
A laser scanning motor having a rotatable polygonal outer mirror for deflecting a light beam incident thereon, said laser scanning motor comprising: a rotor assembly including a main portion supporting on a side thereof the rotatable mirror for deflecting said light beam; a brushless motor having poles made of a plastic magnetic material and mounted in said main portion; and a rotor yoke coupled between said main portion and said poles of said plastic magnetic material.
Claim 3
Dependent Claim
18 words
A laser scanning motor according to claim 1 wherein said main portion is made of a nonmagnetic material.
Claim 4
Dependent Claim
91 words
A laser scanning motor having a rotatable polygonal outer mirror for deflecting a light beam incident thereon, said laser scanning motor comprising: a rotor assembly including a main portion supporting on a side thereof the rotatable mirror for deflecting said light beam; stator coils; rotor magnetic poles of a permanent magnet made of a plastic magnetic material and mounted in said main portion in a confronting relation to said stator coils; and a bearing made of a plastic magnetic material and joined centrally to said magnetic poles in said main portion.
Claim 5
Dependent Claim
91 words
A laser scanning motor having a rotatable polygonal outer mirror for deflecting a light beam incident thereon, said laser scanning motor comprising: a rotor assembly including a main portion supporting on a side thereof the rotatable mirror for deflecting said light beam; stator coils; rotor magnetic poles of a permanent magnet made of a plastic magnetic material and mounted in said main portion in a confronting relation to said stator coils; and a bearing made of a plastic magnetic material and joined centrally to said magnetic poles in said main portion.
Claim 6
Dependent Claim
124 words
A laser scanning motor having a rotatable polygonal outer mirror for deflecting light beams incident thereon, said laser scanning motor comprising: a base; a rotor assembly rotatably supported on said base and including a main portion supporting on a side thereof the rotatable mirror for deflecting said light beams, said rotor assembly having an axially defined doughnut-shaped cavity; rotor magnetic poles made of a plastic magnetic material and disposed on a side wall of said cavity with a rotor yoke therebetween; stator coils dispersed in said cavity in confronting relation to said rotor magnetic poles; and a cup-shaped coil yoke having a bottom surface secured to said base and disposed in confronting relation to said rotor magnetic poles having said stator coils disposed therebetween.
Claim 7
Dependent Claim
124 words
A laser scanning motor having a rotatable polygonal outer mirror for deflecting light beams incident thereon, said laser scanning motor comprising: a base; a rotor assembly rotatably supported on said base and including a main portion supporting on a side thereof the rotatable mirror for deflecting said light beams, said rotor assembly having an axially defined doughnut-shaped cavity; rotor magnetic poles made of a plastic magnetic material and disposed on a side wall of said cavity with a rotor yoke therebetween; stator coils dispersed in said cavity in confronting relation to said rotor magnetic poles; and a cup-shaped coil yoke having a bottom surface secured to said base and disposed in confronting relation to said rotor magnetic poles having said stator coils disposed therebetween.
Claim 8
Independent Claim
141 words
A method of manufacturing a laser scanning motor having a rotatable mirror for deflecting a light beam incident thereon, said method comprising the steps of: (a) defining a cavity in a disc-shaped metallic blank for receiving a field magnet, a central through hole in the blank for receiving a bearing holder, and a material retaining portion in the blank for a material of the field magnet; (b) filling a plastic magnetic material in the cavity, an outer circumferential portion of the central through hole, and the material retaining portion, a cylindrical portion positioned outside of a center of the central through hole and cavity, while forming a bearing holder centrally in the central through hole and cavity which has a diameter smaller than that of the central through hole; and (c) subsequently, forming the mirror on a side of the blank.
Claim 9
Independent Claim
141 words
A method of manufacturing a laser scanning motor having a rotatable mirror for deflecting a light beam incident thereon, said method comprising the steps of: (a) defining a cavity in a disc-shaped metallic blank for receiving a field magnet, a central through hole in the blank for receiving a bearing holder, and a material retaining portion in the blank for a material of the field magnet; (b) filling a plastic magnetic material in the cavity, an outer circumferential portion of the central through hole, and the material retaining portion, a cylindrical portion positioned outside of a center of the central through hole and cavity, while forming a bearing holder centrally in the central through hole and cavity which has a diameter smaller than that of the central through hole; and (c) subsequently, forming the mirror on a side of the blank.
Claim 10
Dependent Claim
39 words
A method according to claim 5, wherein said step (a) of forming the material retaining portion includes a step of forming a through hole of an inverted conical shape extending from the cavity to a surface of the blank.
Claim 11
Dependent Claim
42 words
A method according to claim 5, wherein said step (a) of forming the material retaining portion includes a step of forming a through hole of an inverted conical shape extending from the cavity and terminating short of a surface of the blank.
Claim 12
Dependent Claim
32 words
A method according to claim 5, wherein said step (a) of forming the material retaining portion includes a step of forming an undercut portion in an upper outer periphery of the cavity.
Claim 13
Dependent Claim
31 words
A method according to claim 5, wherein said step (a) of forming the material retaining portion includes a step of forming a knurled portion in an outer periphery of the cavity.
Claim 14
Dependent Claim
29 words
A method according to claim 5, wherein said step (a) of forming the material retaining portion includes a step of forming an undercut portion in the central through hole.
Claim 15
Dependent Claim
33 words
A method according to claim 5, wherein said step (b) includes forming the bearing holder centrally in the blank and forming a through hole for inserting therein a bearing which supports a shaft.
Claim 16
Dependent Claim
18 words
A method according to claim 5, further comprising a step of supporting a shaft in the bearing holder.
Claim 17
Independent Claim
171 words
A method of manufacturing a laser scanning motor having a rotatable mirror for deflecting a light beam incident thereon, said method comprising the steps of: (a) defining a cavity in a disc-shaped metallic blank for receiving a field magnet, the cavity and metallic blank having the same axis, an annular recess extending outwardly from the cavity for receiving poles for detecting the position of a rotor assembly, a central through hole in the blank for receiving a bearing holder, and a material retaining portion in the blank for receiving a material of the field magnet; (b) filling a plastic magnetic material in the cavity, the annular recess, an outer circumferential portion of the central through hole, and the material retaining portion, a cylindrical part positioned outside a center of the central through hole and cavity, while forming a bearing holder centrally in the central through hole and cavity, the bearing holder having a diameter smaller than the central through hole; and (c) forming the mirror on a side of the blank.
Claim 18
Independent Claim
171 words
A method of manufacturing a laser scanning motor having a rotatable mirror for deflecting a light beam incident thereon, said method comprising the steps of: (a) defining a cavity in a disc-shaped metallic blank for receiving a field magnet, the cavity and metallic blank having the same axis, an annular recess extending outwardly from the cavity for receiving poles for detecting the position of a rotor assembly, a central through hole in the blank for receiving a bearing holder, and a material retaining portion in the blank for receiving a material of the field magnet; (b) filling a plastic magnetic material in the cavity, the annular recess, an outer circumferential portion of the central through hole, and the material retaining portion, a cylindrical part positioned outside a center of the central through hole and cavity, while forming a bearing holder centrally in the central through hole and cavity, the bearing holder having a diameter smaller than the central through hole; and (c) forming the mirror on a side of the blank.
Claim 19
Dependent Claim
36 words
A method according to claim 13, wherein said step (a) of forming the material retaining portion comprises forming a through hole of an inverted conical shape extending from the cavity to a surface of the blank.
Claim 20
Dependent Claim
39 words
A method according to claim 13, wherein said step (a) of forming the material retaining portion comprises forming a through hole of an inverted conical shape extending from the cavity and terminating short of a surface of the blank.
Claim 21
Dependent Claim
29 words
A method according to claim 13, wherein said step (a) of forming the material retaining portion comprises forming an undercut portion in an upper outer periphery of the cavity.
Claim 22
Dependent Claim
28 words
A method according to claim 13, wherein said step (a) of forming the material retaining portion comprises forming a knurled portion in an outer periphery of the cavity.
Claim 23
Dependent Claim
26 words
A method according to claim 24, wherein said step (a) of forming the material retaining portion comprises forming an undercut portion in the central through hole.
Claim 24
Dependent Claim
33 words
A method according to claim 24, wherein said step (a) comprises forming the bearing holder centrally in the blank and forming a through hole for inserting therein a bearing which supports a shaft.
Claim 25
Dependent Claim
19 words
A method according to claim 24, further comprising a step of forming a shaft supported in the bearing holder.
References Cited (Backward Citations)
US2988456A
Cited
US4141620A
Cited
US4132910A
Cited
US4363984A
Cited
US4551645A
Cited
US4455516A
Cited
JPS58108513A
Cited
US4523800A
Cited
JPS59220060A
Cited
US4606251A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |