Rotational operation mechanism and music playback apparatus using the mechanism

• US 6,864,879 B2
• Filed: 05/16/2002
• Issued: 03/08/2005
• Est. Priority Date: 05/17/2001
• Status: Expired due to Fees

• Current Assignee: Pioneer Corporation
• Original Assignee: Pioneer Corporation
• Inventors: Nojima, Yoshitaka, Muratani, Kenji
• Primary Examiner(s): Chow, Dennis-Doon
• Assistant Examiner(s): Kumar, Srilakshmi K.
• Application Number:
  US10/146,439
• Publication Number:
  US 20020171626A1
• Time in Patent Office: 1,027 Days
• Field of Search: 345/156, 345/723, 345/727, 345/473, 345/161, 360/73.08, 360/137, 200/4, 341/20, 386/81, 386/52
• US Class Current: 345/156
• CPC Class Codes: G10H 1/0091 Means for obtaining special acoustic effects combined with modulation G10H1/043
• CPC Class Codes: G10H 2210/241 Scratch effects, i.e. emulating playback velocity or pitch manipulation effects normally obtained by a disc-jockey manually rotating a LP record forward and backward
• CPC Class Codes: G11B 19/00 Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
• CPC Class Codes: G11B 19/20 Driving; Starting; Stopping; Control thereof
• CPC Class Codes: G11B 2220/2545 CDs
• CPC Class Codes: G11B 2220/41 Flat as opposed to hierarchical combination, e.g. library of tapes or discs, CD changer, or groups of record carriers that together store one title
• CPC Class Codes: G11B 27/005 Reproducing at a different information rate from the information rate of recording for television signals H04N5/783

Abstract

A rotational operation mechanism for a DJ apparatus enables smooth rotation to be achieved using a simple configuration. A rotational operation mechanism has a base, a display window member fixed onto the base, a ring member positioned on the display window member and holding a plurality of rotatable balls, and a rotation operation portion positioned on the ring member and operated by an operator. Mutually facing surfaces of the display window member and the rotation operation portion are provided with grooves that have substantially the same diameter as the ring member. The ring member is sandwiched between the display window member and the rotation operation portion such that the plurality of balls are received in the groove of the display window member and the groove of the rotation operation portion, and the ring member is rotatable in a peripheral direction. One of the rotation operation portion and the base is provided with magnets and the other of the rotation operation portion, and the base is provided with metal portions at positions facing the magnets.

Claims

1. A rotational operation mechanism, comprising:

a base member;

a ring member that is positioned on the base member and holds a plurality of rotatable balls; and

an annularly shaped rotation operation portion positioned on the ring member and operated by an operator, wherein

mutually facing surfaces of the base member and the rotation operation portion are provided with grooves that have substantially the same diameter as the ring member,

the ring member is sandwiched between the base member and the rotation operation portion such that the plurality of balls of the ring member are received in the groove of the base member and the groove of the rotation operation portion so as to allow rotation of the ring member, and

one of the rotation operation portion and the base member is provided with magnets and the other of the rotation operation portion and the base member is provided with metal portions at positions facing the magnets.

2. The rotational operation mechanism according to claim 1, wherein the magnets are provided equidistantly at a plurality of positions on the rotation operation portion or the base member, and the plurality of positions correspond to the circumference of the rotation operation portion.

3. The rotational operation mechanism according to claim 2, wherein the magnets are provided on either the rotation operation portion or the base member such that a gap is provided between the magnets and the metal portions.

4. The rotational operation mechanism according to claim 1, wherein the magnets have a ring shape that corresponds to the circumference of the rotation operation portion.

5. The rotational operation mechanism according to claim 1, wherein a plurality of teeth are formed continuously at positions on the circumference of the rotation operation portion, and the rotational operation mechanism is further provided with a rotation detection unit for detecting a rotation of the rotation operation portion by counting the plurality of teeth.

6. The rotational operation mechanism according to claim 1, wherein the base member is provided with a holding member that engages with a portion of the rotation operation portion and holds the rotation operation portion such that the rotation operation portion can be freely engaged and disengaged.

7. The rotational operation mechanism according to claim 1, wherein the base member includes a base and an annular member fixed onto the base, and wherein the groove is formed on the annular member.

8. The rotational operation mechanism according to claim 1, wherein the magnets and the metal portions face each other with a gap therebetween.

9. The rotational operation mechanism according to claim 1, wherein the magnets and the metal portions face without contacting each other.

10. A music playback apparatus comprising:

a base member;

a ring member that is positioned on the base member and holds a plurality of rotatable balls;

an annularly shaped rotation operation portion positioned on the ring member and operated by an operator;

a playback unit for playing back music discs; and

a control unit for controlling playback of the playback unit in accordance with output from a rotation detection unit, wherein

mutually facing surfaces of the base member and the rotation operation portion are provided with grooves that have substantially the same diameter as the ring member,

the ring member is sandwiched between the base member and the rotation operation portion such that the plurality of balls of the ring member are received in the groove of the base member and the groove of the rotation operation portion so as to allow rotation of the ring member,

one of the rotation operation portion and the base member is provided with magnets and the other of the rotation operation portion and the base member is provided with metal portions at positions facing the magnets,

a plurality of teeth are formed continuously at positions on the circumference of the rotation operation portion, and

the rotational operation mechanism is further provided with the rotation detection unit for detecting a rotation of the rotation operation portion by counting the plurality of teeth.

11. The music playback apparatus according to claim 10, wherein the magnets and the metal portions face each other with a gap therebetween.

12. The music playback apparatus according to claim 10, wherein the magnets and the metal portions face without contacting each other.

13. A music playback apparatus comprising:

a base member;

a ring member that is positioned on the base member and holds a plurality of rotatable balls;

an annularly shaped rotation operation portion positioned on the ring member and operated by an operator;

a playback unit for playing back music discs; and

a display section provided in a center portion of the annular member, wherein

mutually facing surfaces of the base member and the rotation operation portion are provided with grooves that have substantially the same diameter as the ring member,

the ring member is sandwiched between the base member and the rotation operation portion such that the plurality of balls of the ring member are received in the groove of the base member and the groove of the rotation operation portion so as to allow rotation of the ring member,

one of the rotation operation portion and the base member is provided with magnets and the other of the rotation operation portion and the base member is provided with metal portions at positions facing the magnets,

the base member includes a base and an annular member fixed onto the base, and the groove is formed on the annular member.

14. The music playback apparatus according to claim 13, wherein the magnets and the metal portions face each other with a gap therebetween.

15. The music playback apparatus according to claim 13, wherein the magnets and the metal portions face without contacting each other.

16. A music playback apparatus comprising:

a base member;

a ring member that is positioned on the base member and holds a plurality of rotatable balls;

an annularly shaped rotation operation portion positioned on the ring member and operated by an operator;

a playback unit for playing back music discs; and

an operating switch member provided in a center portion of the annular member, wherein

mutually facing surfaces of the base member and the rotation operation portion are provided with grooves that have substantially the same diameter as the ring member,

the ring member is sandwiched between the base member and the rotation operation portion such that the plurality of balls of the ring member are received in the groove of the base member and the groove of the rotation operation portion so as to allow rotation of the ring member, and

one of the rotation operation portion and the base member is provided with magnets and the other of the rotation operation portion and the base member is provided with metal portions at positions facing the magnets,

the base member includes a base and an annular member fixed onto the base, and

the groove is formed on the annular member.

17. The music playback apparatus according to claim 16, wherein the magnets and the metal portions face each other with a gap therebetween.

18. The music playback apparatus according to claim 16, wherein the magnets and the metal portions face without contacting each other.

19. A rotational operation mechanism comprising:

a base member;

a ring member holding a plurality of rotatable balls; and

a rotation operation member configured for operation by an operator,

wherein the base member and the rotation operation member each comprise a substantially circumferential groove,

wherein the ring member is disposed between the base member and the rotation operation member such that the rotatable balls are movably received in a passage formed by the groove of the base member and the groove of the rotation operation member, and

wherein one of the base member and the rotation operation member is provided with one or more magnets and the other of the base member and the rotation operation member is provided with metal that faces the magnets to thereby provide a biasing force therebetween.

20. A music playback apparatus comprising a rotational operation mechanism according to claim 19.

21. The music playback apparatus according to claim 20, further comprising:

a rotation detector for detecting rotation of the rotation operation member.

22. The music playback apparatus according to claim 20, further comprising:

a display arranged in an opening formed in the rotation operation member.

23. The music playback apparatus according to claim 20, further comprising:

one or more operator controls arranged in an opening formed in the rotation operation member.

24. The music playback apparatus according to claim 20, wherein the base member comprises an engagement mechanism for engaging the base member to the rotation operation member with the ring member therebetween.

25. The music playback apparatus according to claim 20, wherein the base member comprises a base and an annular member attached to the base, and wherein the groove of the base member is formed in the annular member thereof.