EP1076904A1 - Damper for electronic device - Google Patents

Damper for electronic device

Info

Publication number
EP1076904A1
EP1076904A1 EP00926737A EP00926737A EP1076904A1 EP 1076904 A1 EP1076904 A1 EP 1076904A1 EP 00926737 A EP00926737 A EP 00926737A EP 00926737 A EP00926737 A EP 00926737A EP 1076904 A1 EP1076904 A1 EP 1076904A1
Authority
EP
European Patent Office
Prior art keywords
damper
housing
fluid
optical unit
porous material
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.)
Pending
Application number
EP00926737A
Other languages
German (de)
French (fr)
Inventor
Horst Rumpf
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.)
Philips Intellectual Property and Standards GmbH
Koninklijke Philips NV
Original Assignee
Philips Corporate Intellectual Property GmbH
Koninklijke Philips Electronics NV
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 Philips Corporate Intellectual Property GmbH, Koninklijke Philips Electronics NV filed Critical Philips Corporate Intellectual Property GmbH
Publication of EP1076904A1 publication Critical patent/EP1076904A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/003—Dampers characterised by having pressure absorbing means other than gas, e.g. sponge rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F13/00—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs
    • F16F13/04—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper
    • F16F13/06—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper
    • F16F13/08—Units comprising springs of the non-fluid type as well as vibration-dampers, shock-absorbers, or fluid springs comprising both a plastics spring and a damper, e.g. a friction damper the damper being a fluid damper, e.g. the plastics spring not forming a part of the wall of the fluid chamber of the damper the plastics spring forming at least a part of the wall of the fluid chamber of the damper
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F5/00—Liquid springs in which the liquid works as a spring by compression, e.g. combined with throttling action; Combinations of devices including liquid springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/006—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium characterised by the nature of the damping medium, e.g. biodegradable
    • 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

Definitions

  • the invention relates to an electronic device for reading information stored on disc-shaped data carriers and/or writing information on disc-shaped data carriers, comprising a housing and an optical unit arranged in the housing, at least one damper being provided between the housing and the optical unit.
  • Such a device is known, for example, from the document EP 0962361.
  • the damper in this known device comprises oil-filled rubber dampers, each with a plunger which is movably supported for the purpose of generating viscous friction in the oil.
  • the damping generated in this known damper is linearly dependent on the oil velocity generated by the plunger.
  • Such a construction furthermore, has a definite resonance point where the acceleration acting on the mass to be damped is greater than the excitation.
  • the damper comprises a porous material and a fluid.
  • the relative fluid velocity, occurring upon a deformation of the damper, and thus also the generated damping, is increased by the porous material.
  • the damper has a structure which is formed as it were by a plurality of small dampers because of the porous material. A deformation of the damper as a result leads to a substantially higher fluid velocity. The viscous friction and the damping resulting therefrom are enhanced thereby.
  • porous material is understood to mean a material with a cell structure capable of accommodating a fluid, said cell structure achieving a distribution of the fluid in the shape of droplets.
  • the porous material has a low inherent stiffness.
  • a particularly advantageous material is foam material.
  • the fluid has a high viscosity value. This increases the damping effect which is based on viscous friction.
  • Fig. la shows the damping construction for an electronic device which is sensitive to shocks, the damper being undeformed in a rest position
  • Fig. lb is an enlarged detail of the damper of Fig. la
  • Fig. 2a shows the damping construction of Fig. la, with the damper deformed as a result of an impact acting on the housing, and
  • Fig. 2b is an enlarged detail of the damper of Fig. 2a.
  • Fig. la is a diagrammatic picture of a damping construction of an electronic device for reading information stored on disc-shaped data carriers and/or writing information on disc-shaped data carriers, representing an embodiment of the invention.
  • a device may be, for example, a CD player or a DND player.
  • the device comprises a housing 1 and an optical unit 2 accommodated in the housing 1.
  • the housing 1 and the optical unit 2 are coupled by means of a damper 3.
  • the damper 3 has an elastic outer membrane 4 as its outer envelope.
  • the damper 3 is fastened at one side to the housing 1 and at the other side to the optical unit 2.
  • the damper 3 is filled with a foam material 5 and with oil 6.
  • the oil 6 has the function of generating viscous friction. The viscous friction is dependent on the fluid velocity of the oil 6.
  • the foam material 5 is provided for the purpose of increasing the fluid velocity and increasing the viscous friction resulting therefrom.
  • Fig. lb is a detailed view on an enlarged scale of the damper 2 of Fig. la filled with foam material 5 and oil 6.
  • the oil 6 shows a structure 7 of droplets which are interconnected by narrow channels 8.
  • Figs, la and lb show the damper 3 in the undeformed state.
  • Figs. 2a and 2b show the damper 3 in a deformed state. Such a deformation occurs, for example, when the housing 1 moves as a result of an impact. The task of the damper 3 now is to keep such an impact away from the optical unit 2, so that a reading or writing operation free from errors of the optical unit 2 is safeguarded.
  • the damper 2 When the housing 1 moves towards the optical unit 2 as a result of an impact or other forces acting on the housing 1, the damper 2 will be compressed.
  • the foam-oil structure present inside the damper 3 is also deformed thereby.
  • the damping action of the damper 2 is based on viscous friction of the oil 5.
  • the foam material 6 increases the oil velocity occurring upon the deformation of the damper 3, and thus also the viscous friction.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Lubricants (AREA)
  • Mounting Components In General For Electric Apparatus (AREA)

Abstract

The invention relates to an electronic device for reading information stored on disc-shaped data carriers and/or writing information on disc-shaped data carriers, comprising a housing (1) and an optical unit (2) arranged in the housing (1), at least one damper (3) being provided between the housing (1) and the optical unit (2). According to the invention, the damper (3) comprises a porous material (5) and a fluid (6).

Description

DAMPER FOR ELECTRONIC DEVICE
The invention relates to an electronic device for reading information stored on disc-shaped data carriers and/or writing information on disc-shaped data carriers, comprising a housing and an optical unit arranged in the housing, at least one damper being provided between the housing and the optical unit.
Such a device is known, for example, from the document EP 0962361.
The damper in this known device comprises oil-filled rubber dampers, each with a plunger which is movably supported for the purpose of generating viscous friction in the oil. The damping generated in this known damper is linearly dependent on the oil velocity generated by the plunger. Such a construction, furthermore, has a definite resonance point where the acceleration acting on the mass to be damped is greater than the excitation.
It is an object of the invention to provide a device of the kind mentioned in the opening paragraph which has better damping properties.
According to the invention, this object is achieved in that the damper comprises a porous material and a fluid.
The relative fluid velocity, occurring upon a deformation of the damper, and thus also the generated damping, is increased by the porous material. The damper has a structure which is formed as it were by a plurality of small dampers because of the porous material. A deformation of the damper as a result leads to a substantially higher fluid velocity. The viscous friction and the damping resulting therefrom are enhanced thereby.
The term porous material is understood to mean a material with a cell structure capable of accommodating a fluid, said cell structure achieving a distribution of the fluid in the shape of droplets.
In addition, a non-linear damping effect occurs. The damping drops non- linearly when the relative velocity between the housing and the optical unit is reduced. If this non-linear behavior is attuned to the mass of the optical unit to be damped, the required free space between the housing and the optical unit can be made smaller, without the maximum acceleration acting on the optical unit being increased.
Since a complete structure is deformed, such a damper can also be realized without a plunger. The minimum height of the compressed damper can be reduced thereby. This leads to an additional reduction in the constructional height.
Preferably, the porous material has a low inherent stiffness. A particularly advantageous material is foam material.
Preferably, the fluid has a high viscosity value. This increases the damping effect which is based on viscous friction.
Particular advantages are obtained in devices which are designed for incorporation in motor vehicles as well as in portable devices, because the constructional space available for these devices is limited and the dampers according to the invention can be implemented in a very space-saving manner.
A diagrammatically depicted embodiment of the invention will be explained in more detail below with reference to Figs, la, lb and 2a, 2b of the drawing, in which:
Fig. la shows the damping construction for an electronic device which is sensitive to shocks, the damper being undeformed in a rest position, Fig. lb is an enlarged detail of the damper of Fig. la,
Fig. 2a shows the damping construction of Fig. la, with the damper deformed as a result of an impact acting on the housing, and
Fig. 2b is an enlarged detail of the damper of Fig. 2a.
Fig. la is a diagrammatic picture of a damping construction of an electronic device for reading information stored on disc-shaped data carriers and/or writing information on disc-shaped data carriers, representing an embodiment of the invention. Such a device may be, for example, a CD player or a DND player.
The device comprises a housing 1 and an optical unit 2 accommodated in the housing 1.
The housing 1 and the optical unit 2 are coupled by means of a damper 3. The damper 3 has an elastic outer membrane 4 as its outer envelope. The damper 3 is fastened at one side to the housing 1 and at the other side to the optical unit 2. The damper 3 is filled with a foam material 5 and with oil 6. The oil 6 has the function of generating viscous friction. The viscous friction is dependent on the fluid velocity of the oil 6. The foam material 5 is provided for the purpose of increasing the fluid velocity and increasing the viscous friction resulting therefrom. Fig. lb is a detailed view on an enlarged scale of the damper 2 of Fig. la filled with foam material 5 and oil 6. The oil 6 shows a structure 7 of droplets which are interconnected by narrow channels 8.
Figs, la and lb show the damper 3 in the undeformed state.
Figs. 2a and 2b show the damper 3 in a deformed state. Such a deformation occurs, for example, when the housing 1 moves as a result of an impact. The task of the damper 3 now is to keep such an impact away from the optical unit 2, so that a reading or writing operation free from errors of the optical unit 2 is safeguarded.
When the housing 1 moves towards the optical unit 2 as a result of an impact or other forces acting on the housing 1, the damper 2 will be compressed. The foam-oil structure present inside the damper 3 is also deformed thereby. The damping action of the damper 2 is based on viscous friction of the oil 5. The foam material 6 increases the oil velocity occurring upon the deformation of the damper 3, and thus also the viscous friction.

Claims

CLAIMS:
1. An electronic device for reading information stored on disc-shaped data carriers and/or writing information on disc-shaped data carriers, comprising a housing (1) and an optical unit (2) arranged in the housing (1), at least one damper (3) being provided between the housing (1) and the optical unit (2), characterized in that the damper (3) comprises a porous material (5) and a fluid (6).
2. A device as claimed in claim 1, characterized in that the porous material (5) is a material with a low inherent stiffness.
3. A device as claimed in claim 1, characterized in that the porous material (5) is a foam material.
4. A device as claimed in claim 1, characterized in that the fluid (6) is a material of high viscosity, in particular oil.
5. A device as claimed in claim 1, characterized in that the damper (3) has an elastic membrane (4) as its outer envelope, in particular a rubber membrane.
6. A vehicle with a device as claimed in claim 1.
7. A fluid-filled damper (3) with an elastic membrane (4) as its outer envelope, characterized in that the damper (3) comprises a porous material (5) and a fluid (6).
8. The use of a damper (3) as claimed in claim 7 in portable electronic devices or in electronic devices designed for incorporation in motor vehicles.
EP00926737A 1999-03-12 2000-03-10 Damper for electronic device Pending EP1076904A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19911184 1999-03-12
DE19911184 1999-03-12
PCT/EP2000/002214 WO2000054280A1 (en) 1999-03-12 2000-03-10 Damper for electronic device

Publications (1)

Publication Number Publication Date
EP1076904A1 true EP1076904A1 (en) 2001-02-21

Family

ID=7900826

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00926737A Pending EP1076904A1 (en) 1999-03-12 2000-03-10 Damper for electronic device

Country Status (3)

Country Link
EP (1) EP1076904A1 (en)
JP (1) JP2002539577A (en)
WO (1) WO2000054280A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1023288C2 (en) * 2003-04-28 2004-11-02 Leonardus Arnoldus Teklenburg Device for supporting vibration sensitive equipment.
JP4645014B2 (en) * 2003-10-15 2011-03-09 卓三 岩壷 Colloidal damper
JP5066395B2 (en) * 2007-06-14 2012-11-07 学校法人福岡工業大学 Active control colloidal damper
JP5110118B2 (en) * 2010-05-06 2012-12-26 卓三 岩壷 Colloidal damper

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62288739A (en) * 1986-06-04 1987-12-15 Matsushita Electric Ind Co Ltd Damper device and its manufacture
JPH0821474A (en) * 1994-07-06 1996-01-23 Matsushita Electric Ind Co Ltd Air spring device
JPH09147540A (en) * 1995-11-24 1997-06-06 Hitachi Ltd Base for magnetic information storage apparatus

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0054280A1 *

Also Published As

Publication number Publication date
JP2002539577A (en) 2002-11-19
WO2000054280A1 (en) 2000-09-14

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