GB2275520A - Optical data disk balancer - Google Patents

Optical data disk balancer Download PDF

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Publication number
GB2275520A
GB2275520A GB9301833A GB9301833A GB2275520A GB 2275520 A GB2275520 A GB 2275520A GB 9301833 A GB9301833 A GB 9301833A GB 9301833 A GB9301833 A GB 9301833A GB 2275520 A GB2275520 A GB 2275520A
Authority
GB
United Kingdom
Prior art keywords
disk
optical data
balancer
data disk
hub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9301833A
Other versions
GB9301833D0 (en
Inventor
Ian Cowen
Jonathan Mark Nowill
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9301833A priority Critical patent/GB2275520A/en
Publication of GB9301833D0 publication Critical patent/GB9301833D0/en
Publication of GB2275520A publication Critical patent/GB2275520A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00—Testing static or dynamic balance of machines or structures
    • G01M1/30—Compensating imbalance
    • G01M1/32—Compensating imbalance by adding material to the body to be tested, e.g. by correcting-weights
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0014—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form
    • G11B23/0021—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G11B33/08—Insulation or absorption of undesired vibrations or sounds
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rotational Drive Of Disk (AREA)

Abstract

An optical data disk, eg a compact disc, 13 is placed securely on the hub 11. The hub being allowed to rotate freely lets the data disk attain its neutral position with its heaviest section at point A. The disk is then balanced using small self-adhesive weights added at point B. <IMAGE>

Description

Optical Data Disk Balancer This invention relates to a 'optical data disk' balancer.
Optical data disks are a well known medium for storing large masses of data.
Constructed of a plastic substrate, metallic membrane and a protective surface coating, they are used to store digital data such as computer information, video pictures and more popularly, music in a form known as compact discs.
The disks are loaded into a specifically designed piece of instrumentation capable of reading the information from the disk and converting it to a useful signal. eg. analogue music signals from a compact disc.
In this instrumentation the disk is spun at several hundred RPM and the information read from it by a tracking laser beam.
Due to the nature of the production process these disks can be manufactured so they are not uniform in thickness and/or they are not concentric. Consequently the disks are out of balance about the centre of the mounting aperture.
According to the present invention there is provided a piece of apparatus to enable these disks to be balanced. Comprising of a base, a freely rotating hub, a means of retaining a disk on the hub concentricly while allowing easy fitment and removal of disks and a number of small self adhesive balance weights.
Specific embodiments of the invention will now be described by way of examples with reference to the accompanying drawings.
Example 1 Figure 1 shows a front elevation of a balancer without a disk fitted.
Figure 2 shows a side elevation of a balancer without a disk fitted.
Figure 3 shows in perspective a balancer with a compact disc fitted.
Referring to the drawing, the balancer comprises a base 10 and a spindle 12 which is fixed in the base parallel to the bottom surface ofthe base. On this spindle a hub 11 is fixed via a bearing 14.
In order to hold a compact disk 13 on the hub, a means of retaining the disk 15 is used to hold the disk concentric. This retaining method must be quick and easy as well as accurate to enable the balancer to be easy to use. The disk is placed onto the hub. The disk will now rotate till the heaviest section is at point k With the disk in this position a small self adhesive weight 16 is placed at the top ofthe disk, point B opposite the heavy spot. The disk is then slowly spun and if it stops in an arbitrary position then the disk is considered balanced.
If the disk settles with either point A or B at the bottom the weight 16 is increased or decreased accordingly.
The disk is then removed and used as normal and another disk balanced if required.
Example 2 Figure 4 shows in perspective a balancer with a compact disc fitted.
Referring to the drawing, the balancer comprises a base 10 and a spindle 12 which is sits on the two sides ofthe base which are parallel to the bottom surface. On this spindle a hub 11 is fixed.
In order to hold a compact disk 13 on the hub, a means of retaining the disk 15 is used to hold the disk concentric. This retaining method must be quick and easy as well as accurate to enable the balancer to be easy to use. Using the spirit level 18 the base is levelled by adjusting the height ofthe adjustable feet 17. The disk is placed onto the hub and the assembly placed on the base. The disk will now rotate till the heaviest section is at (Point A) its lowest point. With the disk in this position a small self adhesive weight 16 is placed at the top ofthe disk (Point B), opposite the heavy spot.
The disk is then slowly spun and if it stops in an arbitrary position then the disk is considered balanced.
If the disk settles with either point A or B at the bottom the weight 16 is increased or decreased accordingly.
The disk is then removed and used as normal and another disk balanced if required.

Claims (5)

claims
1 An optical data disk balancer comprising of a base, a freely rotating hub, a means of retaining a disk on the hub concentricly and small self adhesive balance weights.
2 An optical data disk balancer as claimed in Claim 1 wherein the means of retaining a disk allows easy fitment and removal of disks.
3 An optical data disk balancer as claimed in Claim 1 and Claim 2 wherein height adjustable feet are provided for levelling the base.
4 An optical data disk balancer as claimed in Claim 1,2 and 3 wherein a means of measuring the levelness of the base is provided.
5 A optical data disk balancer substantially as described herein with reference to figures 1-3 of the accompanying drawing.
GB9301833A 1993-01-29 1993-01-29 Optical data disk balancer Withdrawn GB2275520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9301833A GB2275520A (en) 1993-01-29 1993-01-29 Optical data disk balancer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9301833A GB2275520A (en) 1993-01-29 1993-01-29 Optical data disk balancer

Publications (2)

Publication Number Publication Date
GB9301833D0 GB9301833D0 (en) 1993-03-17
GB2275520A true GB2275520A (en) 1994-08-31

Family

ID=10729554

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9301833A Withdrawn GB2275520A (en) 1993-01-29 1993-01-29 Optical data disk balancer

Country Status (1)

Country Link
GB (1) GB2275520A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0997891A1 (en) * 1998-10-30 2000-05-03 Deutsche Thomson-Brandt Gmbh Balanced optical disc

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960409A (en) * 1974-11-25 1976-06-01 Perfect Equipment Corporation Wheel balancing weight
GB2041159A (en) * 1979-01-31 1980-09-03 Gkn Group Services Ltd Shaft balance weights
US5141768A (en) * 1989-08-02 1992-08-25 Asmo Co., Ltd. Method and apparatus for correcting dynamic balance of rotating body

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3960409A (en) * 1974-11-25 1976-06-01 Perfect Equipment Corporation Wheel balancing weight
GB2041159A (en) * 1979-01-31 1980-09-03 Gkn Group Services Ltd Shaft balance weights
US5141768A (en) * 1989-08-02 1992-08-25 Asmo Co., Ltd. Method and apparatus for correcting dynamic balance of rotating body

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0997891A1 (en) * 1998-10-30 2000-05-03 Deutsche Thomson-Brandt Gmbh Balanced optical disc

Also Published As

Publication number Publication date
GB9301833D0 (en) 1993-03-17

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)