Patent EP0210835A2 successfully refreshed from Google Patents.
EP0210835A2
Expired / Lapsed
EP
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Laser scanning motor and method of manufacturing the same
Assignee: SHIKOH ENGINEERING Co Ltd
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Filing: 1986-07-23
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Granted: —
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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 (20) having polygonal outer mirror surfaces (20a). A light beam applied to the polygonal mirror (20) 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 magnet material. In manufacturing the laser scanning motor, the poles and the bearing holder are formed simultaneously by filling the plastic magnet material in one operation, and are firmly secured to the rotor assembly.
Inventors
- 👤 Kikuo Shimazu
- 👤 Kazuo Suzuki
- 👤 Manabu Shiraki
- 👤 Osami Miyao
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 14:26
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: 37
Claim 1
Independent Claim
47 words
A laser scanning motor comprising: a rotatable polygonal mirror having a plurality of polygonal outer mirror surfaces for deflecting a light beam applied thereto; a coreless flat brushless motor disposed in said polygonal mirror; and control means for controlling the rotation of the coreless flat brushless motor.
Claim 2
Dependent Claim
47 words
A laser scanning motor comprising: a rotatable polygonal mirror having a plurality of polygonal outer mirror surfaces for deflecting a light beam applied thereto; a coreless flat brushless motor disposed in said polygonal mirror; and control means for controlling the rotation of the coreless flat brushless motor.
Claim 3
Dependent Claim
76 words
A laser scanning motor according to claim 1, wherein said coreless flat brushless motor comprises a rotor assembly including field magnet having 2P alternate N and S poles (where P is a positive integer that is at least 1), said polygonal mirror being mounted on said rotor assembly, and a stator assembly including group of armature coils shaped as frames and confronting said field magnet, and a position detecting device for said group of armature coils.
Claim 4
Dependent Claim
30 words
A laser scanning motor according to claim 1 or 2, wherein said coreless flat brushless motor includes a rotatable shaft disposed on an outer circumferential surface of a fixed shaft.
Claim 5
Dependent Claim
21 words
A laser scanning motor according to claim 2 or 3, wherein each of said armature coils comprises an air core coil.
Claim 6
Dependent Claim
43 words
A laser scanning motor according to any of claim 2 through 4, wherein each of said armature coils includes conductors for generating a torque, said conductors being spaced an angular interval substantially equal to the width of one pole of said field magnet.
Claim 7
Dependent Claim
23 words
A laser scanning motor according to any of claim 2 through 5, wherein said armature coils are equally angularly spaced without being overlapped.
Claim 8
Dependent Claim
23 words
A laser scanning motor according to any of claim 2 through 6, wherein said position detecting device comprises at least one magnetoelectric transducer.
Claim 9
Dependent Claim
31 words
A laser scanning motor according to claim 7, wherein wherein said position detecting device is provided singly for each number of armature coils which are electrically in phase with each other.
Claim 10
Dependent Claim
37 words
A laser scanning motor according to claim 8, wherein said magnetoelectric transducer is disposed in a frame cavity of an armature coil which is positioned equivalently to a conductor of an armature coil which produces a torque.
Claim 11
Dependent Claim
43 words
A laser scanning motor comprising: a rotor assembly including a main portion supporting on a side thereof a rotatable mirror for deflecting a light beam applied thereto; and brushless motor poles made of a plastic magnet material and mounted in said main portion.
Claim 12
Dependent Claim
43 words
A laser scanning motor comprising: a rotor assembly including a main portion supporting on a side thereof a rotatable mirror for deflecting a light beam applied thereto; and brushless motor poles made of a plastic magnet material and mounted in said main portion.
Claim 13
Dependent Claim
18 words
A laser scanning motor according to claim 10, wherein said main portion is made of a nonmagnetic material.
Claim 14
Dependent Claim
27 words
A laser scanning motor according to claim 10 or 11, including a rotor yoke disposed between said main portion and said poles of a plastic magnett material.
Claim 15
Dependent Claim
75 words
A laser scanning motor comprising: a rotor assembly including a main portion supporting on a side thereof a rotatable mirror for deflecting a light beam applied thereto; stator coils; rotor magnetic poles of a permanent magnet made of a plastic magnet material and mounted in said main portion in confronting relation to said stator coils; and a bearing made of a plastic magnet material and joined to said magnetic poles centrally in said main portion.
Claim 16
Dependent Claim
75 words
A laser scanning motor comprising: a rotor assembly including a main portion supporting on a side thereof a rotatable mirror for deflecting a light beam applied thereto; stator coils; rotor magnetic poles of a permanent magnet made of a plastic magnet material and mounted in said main portion in confronting relation to said stator coils; and a bearing made of a plastic magnet material and joined to said magnetic poles centrally in said main portion.
Claim 17
Dependent Claim
101 words
A laser scanning motor comprising: a base; a rotor assembly rotatably supported on said base and including a main portion supporting on a side thereof a rotatable mirror for deflecting a light beam applied thereto, said rotor assembly having a doughnut-shaped cavity defined axially thereof; rotor magnetic poles made of a plastic magnet material and disposed on a side wall of said cavity with a rotor yoke therebetween; stator coils disposed in said cavity in confronting relation to said rotor magnetic poles; and a coil yoke disposed in confronting relation to said rotor magnetic poles with said stator coils disposed therebetween.
Claim 18
Dependent Claim
101 words
A laser scanning motor comprising: a base; a rotor assembly rotatably supported on said base and including a main portion supporting on a side thereof a rotatable mirror for deflecting a light beam applied thereto, said rotor assembly having a doughnut-shaped cavity defined axially thereof; rotor magnetic poles made of a plastic magnet material and disposed on a side wall of said cavity with a rotor yoke therebetween; stator coils disposed in said cavity in confronting relation to said rotor magnetic poles; and a coil yoke disposed in confronting relation to said rotor magnetic poles with said stator coils disposed therebetween.
Claim 19
Dependent Claim
24 words
A laser scanning motor according to claim 14, wherein said coil yoke is of a cup shape having a bottom secured to said base.
Claim 20
Independent Claim
106 words
A method of manufacturing a laser scanning motor having a rotatable mirror for deflecting a light beam applied thereto, said method comprising the steps of: defining a cavity in a disc-shaped metallic blank for receiving a field magnet, a through hole in said blank for receiving a bearing holder, and a material retaining portion in said blank for a material of the field magnet; thereafter, filling a plastic magnet material in said cavity, an outer circumferential portion of said through hole, and said material retaining portion, while forming a bearing holder centrally in said cavity; and subsequently, forming the mirror on a side of said blank.
Claim 21
Independent Claim
106 words
A method of manufacturing a laser scanning motor having a rotatable mirror for deflecting a light beam applied thereto, said method comprising the steps of: defining a cavity in a disc-shaped metallic blank for receiving a field magnet, a through hole in said blank for receiving a bearing holder, and a material retaining portion in said blank for a material of the field magnet; thereafter, filling a plastic magnet material in said cavity, an outer circumferential portion of said through hole, and said material retaining portion, while forming a bearing holder centrally in said cavity; and subsequently, forming the mirror on a side of said blank.
Claim 22
Dependent Claim
30 words
A method according to claim 16, wherein said material retaining portion comprises a through hole of an inverted conical shape extending from said cavity to a surface of said blank.
Claim 23
Dependent Claim
33 words
A method according to claim 16, wherein said material retaining portion comprises a through hole of an inverted conical shape extending from said cavity and terminating short of a surface of said blank.
Claim 24
Dependent Claim
23 words
A method according to claim 16, wherein said material retaining portion comprises an undercut portion in an upper outer periphery of said cavity.
Claim 25
Dependent Claim
22 words
A method according to claim 16, wherein said material retaining portion comprises a knurled portion in an outer periphery of said cavity.
Claim 26
Dependent Claim
19 words
A method according to claim 16, wherein said material retaining portion comprises an undercut portion in said through hole.
Claim 27
Dependent Claim
30 words
A method according to claim 16, wherein said bearing holder is formed centrally in said blank and has a through hole for inserting therein a bearing which supports a shaft.
Claim 28
Dependent Claim
15 words
A method according to claim 16, wherein a shaft is supported in said bearing holder.
Claim 29
Independent Claim
127 words
A method of manufacturing a laser scanning motor having a rotatable mirror for deflecting a light beam applied thereto, said method comprising the steps of: defining a cavity in a disc-shaped metallic blank for receiving a field magnet, an annular recess outwardly of said cavity for receiving poles for detecting the position of a rotor assembly, a through hole in said blank for receiving a bearing holder, and a material retaining portion in said blank for a material of the field magnet; thereafter, filling a plastic magnet material in said cavity, said annular recess, an outer circumferential portion of said through hole, and said material retaining portion, while forming a bearing holder centrally in said cavity; and subsequently, forming the mirror on a side of said blank.
Claim 30
Independent Claim
127 words
A method of manufacturing a laser scanning motor having a rotatable mirror for deflecting a light beam applied thereto, said method comprising the steps of: defining a cavity in a disc-shaped metallic blank for receiving a field magnet, an annular recess outwardly of said cavity for receiving poles for detecting the position of a rotor assembly, a through hole in said blank for receiving a bearing holder, and a material retaining portion in said blank for a material of the field magnet; thereafter, filling a plastic magnet material in said cavity, said annular recess, an outer circumferential portion of said through hole, and said material retaining portion, while forming a bearing holder centrally in said cavity; and subsequently, forming the mirror on a side of said blank.
Claim 31
Dependent Claim
30 words
A method according to claim 24, wherein said material retaining portion comprises a through hole of an inverted conical shape extending from said cavity to a surface of said blank.
Claim 32
Dependent Claim
33 words
A method according to claim 24, wherein said material retaining portion comprises a through hole of an inverted conical shape extending from said cavity and terminating short of a surface of said blank.
Claim 33
Dependent Claim
23 words
A method according to claim 24, wherein said material retaining portion comprises an undercut portion in an upper outer periphery of said cavity.
Claim 34
Dependent Claim
22 words
A method according to claim 24, wherein said material retaining portion comprises a knurled portion in an outer periphery of said cavity.
Claim 35
Dependent Claim
19 words
A method according to claim 24, wherein said material retaining portion comprises an undercut portion in said through hole.
Claim 36
Dependent Claim
30 words
A method according to claim 24, wherein said bearing holder is formed centrally in said blank and has a through hole for inserting therein a bearing which supports a shaft.
Claim 37
Dependent Claim
15 words
A method according to claim 24, wherein a shaft is supported in said bearing holder.
References Cited (Backward Citations)
No citation records indexed.
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