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Publication numberUS20050128614 A1
Publication typeApplication
Application numberUS 10/802,453
Publication dateJun 16, 2005
Filing dateMar 17, 2004
Priority dateDec 15, 2003
Also published asUS6914734
Publication number10802453, 802453, US 2005/0128614 A1, US 2005/128614 A1, US 20050128614 A1, US 20050128614A1, US 2005128614 A1, US 2005128614A1, US-A1-20050128614, US-A1-2005128614, US2005/0128614A1, US2005/128614A1, US20050128614 A1, US20050128614A1, US2005128614 A1, US2005128614A1
InventorsPo-Sung Kao, Shou-Chy Chia
Original AssigneePo-Sung Kao, Shou-Chy Chia
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Color wheel and color filter assembly thereof
US 20050128614 A1
Abstract
A color filter assembly. The color filter assembly rotates around a central axis and includes a first carrier, a second carrier, a protrusion and a color filter. The first carrier has a first contact surface and a first joining portion protruding therefrom. The second carrier has a second contact surface and a second joining portion connected to the first joining portion. The protrusion is disposed on the first or second contact surface. The color filter has an opening with the protrusion inserted therein such that the color filter is fixed between the first and second carriers.
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Claims(14)
1. A color filter assembly rotating around a central axis thereof, comprising:
a first carrier having a first contact surface and a first joining portion protruding wherefrom;
a second carrier having a second contact surface and a second joining portion connected to the first joining portion, wherein the first and second joining portions are threaded and joined thereby;
a protrusion disposed on the first or second contact surface; and
a color filter having a receiving portion with the protrusion inserted therein such that the color filter is fixed between the first and second carriers.
2. The color filter assembly as claimed in claim 1, wherein the protrusion is enclosed by a flexible material.
3. (canceled)
4. A color filter assembly rotating around a central axis thereof, including:
a first carrier having a first contact surface and at least a first hole disposed thereon;
a second carrier having a second contact surface and at least a second hole disposed thereon;
a color filter disposed between the first and second contact surface, having at least an opening disposed thereon; and
a securing member having at least a rod fastened through the first hole, the opening and the second hole such that the color filter is fixed between the first and second carriers.
5. The color filter assembly as claimed in claim 4, wherein the securing member has two abutting members joined to the rod for securing the color filter between the first and second carriers.
6. A color filter assembly rotating around a central axis thereof, including:
a first carrier having a first contact surface and at least a first hole formed therein;
a second carrier having a second contact surface and at least a second hole disposed thereon;
a color filter disposed between the first and second contact surfaces, having at least an opening formed therein; and
a securing member having at least a rod inserted through the first hole, the opening and the second hole and at least an abutting member connected to the rod for securing the color filter between the first and second carriers.
7. The color filter assembly as claimed in claim 6, wherein the rod, the first hole, the opening and the second hole are threaded for joining the color filter, the first and second carriers.
8. A color wheel, including:
a color filter assembly of claim 1; and
a rotator having a shaft rotating the color filter assembly around the central axis.
9. (canceled)
10. The color wheel as claimed in claim 8, wherein the protrusion is enclosed by a flexible material.
11. A color wheel, including:
a color filter assembly of claim 4; and
a rotator having a shaft rotating the color filter assembly around the central axis.
12. The color wheel as claimed in claim 11, wherein the securing member has two abutting members threaded and joined to the rod for securing the color filter between the first and second carriers.
13. A color wheel, including:
a color filter assembly of claim 6; and
a rotator having a shaft rotating the color filter assembly around the central axis.
14. The color filter assembly as claimed in claim 13, wherein the rod, the first hole, the opening and the second hole are threaded for securing the color filter between the first and second carriers.
Description
    BACKGROUND OF THE INVENTION
  • [0001]
    1. Field of the Invention
  • [0002]
    The present invention relates in general to a color wheel and in particular to a color filter assembly thereof providing improved balance and stability of rotation.
  • [0003]
    2. Description of the Related Art
  • [0004]
    Referring to FIG. 1, the conventional color wheel comprises a carrier 11, a color filter 12 and a motor 2. The color filter 12 is fixed to the carrier 11 by adhesive 13, wherein the carrier 11 is fixed to the shaft 22 at the center of the motor 2 with the cover 21. The motor 2 rotates the carrier 11 and the color filter 12 around central axis 10 via the shaft 22.
  • [0005]
    As mentioned, the color filter 12 is fixed to the carrier 11 by adhesive 13, however, the mass of adhesive 13 is difficult to control due to the flow property thereof such that the color wheel is unbalanced. Moreover, rotational instability and vibration may occur due to unbalanced mass distribution of the color wheel. Furthermore, the color filter 12 comprises a plurality of fan-shaped filter segments adhered to each other, hence, precise positioning thereof is difficult and the segments may be separated during rotation at high speed.
  • SUMMARY OF THE INVENTION
  • [0006]
    Accordingly, an object of the present invention is to provide a color wheel and color filter assembly thereof for improving balance and stability of rotation. The color filter assembly rotates around a central axis and comprises a first carrier, a second carrier, a protrusion and a color filter. The first carrier has a first contact surface and a first joining portion protruding therefrom. The second carrier has a second contact surface and a second joining portion connected to the first joining portion. The protrusion is disposed on the first or second contact surface. The color filter has an opening with the protrusion inserted therein such that the color filter is fixed between the first and second carriers.
  • DESCRIPTION OF THE DRAWINGS
  • [0007]
    The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings, given by way of illustration only and thus not intended to be limitative of the present invention.
  • [0008]
    FIG. 1 is a perspective diagram of a conventional color wheel.
  • [0009]
    FIG. 2 is a perspective diagram of the first embodiment in accordance with the present invention.
  • [0010]
    FIG. 3 is a perspective diagram of the first carrier based on FIG. 2 in accordance with the present invention.
  • [0011]
    FIG. 4 is a perspective diagram of the second embodiment in accordance with the present invention.
  • [0012]
    FIG. 5 is a perspective diagram of the second carrier based on FIG. 4 in accordance with the present invention.
  • [0013]
    FIGS. 6 and 7 are perspective diagrams of the third embodiment in accordance with the present invention.
  • [0014]
    FIGS. 8 and 9 are perspective diagrams of the fourth embodiment in accordance with the present invention.
  • DETAILED DESCRIPTION OF THE INVENTION First Embodiment
  • [0015]
    Referring to FIG. 2, the color wheel has a motor 4 and a color filter assembly including a first carrier 31, a second carrier 41 and a color filter 32 comprising four filter segments 32 a, 32 b, 32 c and 32 d symmetrical to the central axis 30, wherein the filter segments 32 a, 32 b, 32 c and 32 d form an opening 320 at the center of the color filter 32.
  • [0016]
    As shown in FIG. 2, the first carrier 31 has a first joining portion 310 and a plurality of protrusions 312 projecting from the first contact surface 314, and each filter segment has an opening 321 corresponding to the protrusions 312. The second carrier 41 has a second joining portion 410 forming a depression 411 for receiving the first joining portion 310 along the central axis 30, wherein the first and second joining portions 310, 410 are threaded and joined thereby. The color filter 32 is firmly secured between the first and second carriers 31, 41 by seating the protrusions 312 in the corresponding openings 321 of the filter segments 32 a, 32 b, 32 c, 32 d and connecting the second joining portion 410 to the first joining portion 310.
  • [0017]
    Referring to FIG. 3, the first joining portion 310 is disposed at the center of the first carrier 31 and projects from the first contact surface 314. The protrusions 312 are parallel and disposed around the first joining portion 310 and inserted into the corresponding openings 321 of the filter segments 32 a, 32 b, 32 c and 32 d such that the color filter 32 is fixed to the first carriers 31 for preventing separation during rotation. Furthermore, each protrusion 312 is enclosed by a flexible material 313 deformed when joining the opening 321 to firmly secure the color filter 32 on the first carrier 31.
  • Second Embodiment
  • [0018]
    Referring to FIG. 4, the color filter 32 comprises four filter segments 32 a, 32 b, 32 c and 32 d symmetrical to the central axis 30 of the color wheel. As mentioned, the filter segments 32 a, 32 b, 32 c and 32 d form an opening 320 at the center of the color filter 32. The second carrier 41 has a plurality of protrusions 312 projecting from the second contact surface 414, and each filter segment has an opening 321 corresponding to the protrusions 312. Moreover, the second carrier 41 has a second joining portion 410 forming a depression 411 for receiving the first joining portion 310 along the central axis 30. The first and second joining portions 310, 410 are threaded and joined thereby. The color filter 32 is thereby precisely positioned and firmly secured between the first and second carriers 31, 41 by seating the protrusions 312 through the corresponding openings 321 of the filter segments 32 a, 32 b, 32 c, 32 d and joining the second joining portions 410 to the first joining portions 310.
  • [0019]
    As shown in FIG. 5, the second joining portion 410 is at the center of the second carrier 41 and depressed from the second contact surface 414. A plurality of protrusions 312 project from the second contact surface 414 and are inserted into the corresponding openings 321 of the filter segments 32 a, 32 b, 32 c such that the color filter 32 is fixed thereto for preventing separation during rotation. Furthermore, each protrusion 312 is enclosed by a flexible material 313 deformed when joining the opening 321 to firmly secure the color filter 32 on the second carrier 41.
  • Third Embodiment
  • [0020]
    Referring to FIG. 6, the color wheel has a motor 4 and a color filter assembly including a first carrier 31, a second carrier 41, a securing member 50 and a color filter 32 comprising four filter segments 32 a, 32 b, 32 c and 32 d symmetrically surrounding the central axis 30 and forming an opening 320 at the center of the color filter 32. In FIGS. 6 and 7, the first carrier 31 has a plurality of first holes 70, and the second carrier 41 has a plurality of corresponding second holes 60. The securing member 50 comprises a plurality of rods 51 and abutting members 52 connected thereto. As shown in FIG. 7, the rods 51 pass through the second holes 60, the openings 321 and the first holes 70 with the abutting members 52 secured at both ends, and the color filter 32 is thereby firmly fixed between the first and second carriers 31, 41. Particularly, the abutting members 52 are threaded on the surface of the hole 53, and the rods 51 are also threaded corresponding thereto for secure connection.
  • Fourth Embodiment
  • [0021]
    Referring to FIG. 8, the color wheel has a motor 4 and a color filter assembly including a first carrier 31, a second carrier 41, a securing member 50 and a color filter 32 comprising four filter segments 32 a, 32 b, 32 c and 32 d symmetrically surrounding the central axis 30 and forming an opening 320 at the center of the color filter 32. In FIGS. 8 and 9, the first carrier 31 has a plurality of first holes 70, and the second carrier 41 has a plurality of corresponding second holes 60. The securing member 50 comprises a plurality of threaded rods 51 with integrally formed abutting members 52. As shown in FIG. 9, the rods 51 pass through the second holes 60, the openings 321, and are inserted into the first holes 70 and sequentially tightened. The color filter 32 is thereby firmly secured between the first and second carriers 31, 41.
  • [0022]
    As shown in FIG. 8, the color wheel of the present invention further provides a circuit board 5 connected to the motor 4 for supplying driving power. The motor 4 rotates the first carrier 31, the second carrier 41 and the color filter 32 around the central axis 30.
  • [0023]
    In summary, the present invention provides a color wheel utilized for an optical device such as a DLP projector. The color filter 32 can be fixed to the first carrier 31 by inserting the protrusions 312 into the openings 321 according to FIG. 2. Furthermore, the first and second joining portions 310, 410 are connected such that the color filter 32 is further firmly secured between the first and second carriers 31, 41 thus preventing separation during rotation. As shown in FIG. 6, the aforementioned protrusions 312 can be represented by the rods 51 and the abutting members 52. The rods 51 are sequentially inserted through the second holes 60, the openings 321 and the first holes 70 such that the color filter 32 is firmly secured between the first and second carriers 31, 41. The present invention has simple structure capable of improving balance and stability of rotation.
  • [0024]
    While the invention has been described by way of example and in terms of the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation to encompass all such modifications and similar arrangements.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4076393 *Dec 15, 1975Feb 28, 1978The United States Of America As Represented By The Secretary Of The NavyThermal stress-relieving coupling member and support
US6705733 *Feb 21, 2003Mar 16, 2004Prodisc Technology Inc.Color wheel and washer thereof
US20020003704 *May 25, 2001Jan 10, 2002Hideki OhmaeColor wheel assembly and color sequential display device using the same, color wheel unit and color sequential display device using the same, and color sequential display device
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6999253 *Nov 5, 2004Feb 14, 2006Minebea Co., Ltd.Color wheel assembly with color wheel attached directly to driving motor
US7113353 *Nov 5, 2004Sep 26, 2006Minebea Co., Ltd.Method of fixing color wheel to motor
US7268961 *Feb 10, 2005Sep 11, 2007Minebea Co., Ltd.Color wheel, and method and jig for producing same
US7295392Apr 19, 2006Nov 13, 2007Oc Oerlikon Balzers AgColor wheel with aligned segments
US8371945 *Dec 16, 2008Feb 12, 2013Aristocrat Technologies Australia Pty LimitedGaming machine and a network of gaming machines
US8702524Jan 28, 2013Apr 22, 2014Aristocrat Technologies Australia Pty LimitedGaming machine and a network of gaming machines
US20060044526 *Nov 5, 2004Mar 2, 2006Minebea Co., Ltd.Method of fixing color wheel to motor
US20060044656 *Nov 5, 2004Mar 2, 2006Minebea Co., Ltd.Color wheel assembly with color wheel attached directly to driving motor
US20060103813 *Feb 10, 2005May 18, 2006Minebea Co., Ltd.Color wheel, and method and jig for producing same
US20060238909 *Apr 19, 2006Oct 26, 2006Unaxis Balzers Ltd.Color wheel with aligned segments
US20070053089 *Aug 16, 2006Mar 8, 2007Delta Electronics Inc.Color wheel
US20070211180 *Jan 25, 2005Sep 13, 2007Samsung Electronics Co., Ltd.Optical Engine Apparatus And Projection Television Using The Same
US20090179597 *Dec 16, 2008Jul 16, 2009Christian James SalmonGaming Machine And A Network Of Gaming Machines
DE102005029296A1 *Jun 22, 2005Jan 4, 2007Oc Oerlikon Balzers AgColor wheel for projector, has color filter segments whose circumference has radial zones, where indendations of adjacent color filter segments form holes into which pins located on support are inserted in positive manner
Classifications
U.S. Classification359/892, 359/234
International ClassificationG02B5/20, G02B26/00, F16C13/00, G02B7/00
Cooperative ClassificationG02B26/008, G02B7/006
European ClassificationG02B26/00W1
Legal Events
DateCodeEventDescription
Mar 17, 2004ASAssignment
Jan 5, 2009FPAYFee payment
Year of fee payment: 4
Aug 24, 2012ASAssignment
Owner name: ASIA OPTICAL INTERNATIONAL LTD., VIRGIN ISLANDS, B
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ASIA OPTICAL CO., INC.;REEL/FRAME:028842/0284
Effective date: 20120816
Sep 28, 2012FPAYFee payment
Year of fee payment: 8