JP2004325721A - Color wheel balancing structure for image display projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily balance the color wheel balancing structure of an image display projector with an excellent workability by using a multipurpose tool. <P>SOLUTION: A color wheel 5 is pinched and held between a support table 30 and a pressing plate 40 and driven with a moor 50. The pressing plate 40 is provided with balance adjustment ribs 42a through 42f and recessed parts 43a through 43f. The balance adjustment ribs 42a through 42f are so arranged to be dispersing in circumferential direction and extending in radial direction. The recessed parts 43a through 43f are provided at positions corresponding to the balance adjustment ribs 42a through 42f and approach to the outer peripheral edge of the pressing plate 40 so that a space is formed between respective balance adjustment ribs 42a through 42f and the pressing plate 40. The balance adjustment ribs 42a through 42f are cut into a necessary length from the outer peripheral side by inserting such a multipurpose cutting tool as a nipper into the recessed parts 43a through 43f. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a color wheel balancing structure of an image display projector that projects an image and displays the image on a screen or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an image display projector that forms an image by an image forming element using light emitted from a lamp based on image data from a personal computer, a video camera, or the like, and projects the image on a screen or the like to display the image is known. Have been. Such an image display projector includes a color arrangement device that arranges light emitted from a lamp in order to project a color image. 2. Description of the Related Art In an image display projector of a type that forms a color image using one image forming element, which is a so-called single-plate type, a color arrangement device using a color hole is employed.
[0003]
FIGS. 7A and 7B show a color arrangement device using a color wheel. In the color arrangement device 70, a color wheel 71 is sandwiched between a receiving base 72 and a holding plate 73. The color wheel 71 has a configuration in which four color filters 71a, 71b, 71c, 71d of red, green, blue, and white (transparent) are arranged along the circumferential direction. The cradle 72 is attached to a motor 74. The color wheel 71 rotates in the circumferential direction when the receiving base 72 is rotated by the motor 74. The color arrangement device 70 is arranged between the lamp and the image forming element, and transmits the light emitted from the lamp to the rotating color wheel 71 to color the light emitted from the lamp in time series. .
[0004]
In the color arrangement device 70, the balance adjusting member 75 is attached to the holding plate 73. The color arrangement device 70 rotates the color wheel 71 at a high speed. Therefore, if the color wheel 71 is imbalanced, unpleasant wind noise (noise) is generated and mechanical vibration is caused to shorten the life. I will. The balance adjusting member 75 is for adjusting the balance so as not to cause these problems, and is made of metal and has a flat disk shape.
[0005]
The balance adjustment of the color wheel 71 is performed, for example, by measuring the vibration at the time of rotation of the color wheel 71 with a vibration measuring device, detecting the balance adjustment point and the balance adjustment amount, and adjusting the balance according to the balance adjustment point and the balance adjustment amount. This is performed by making a hole 76 in the member 75 (see FIG. 7A) or by attaching an adhesive 77 to the balance adjusting member 75 (see FIG. 7B). In general, the work of measuring the vibration of the color wheel 71 during rotation to detect the balance adjustment point and the balance adjustment amount and the work of opening the hole 76 in the balance adjustment member 75 or attaching the adhesive 77 are performed several times. Repeated.
[0006]
Regarding the motor for driving the color wheel, after the color wheel is mounted and fixed, putty is applied to the surface of the clamper to which the color wheel is mounted and fixed and the surface of the wheel hub, and the putty is UV-cured or heat-cured to balance the imbalance. A correction is known (for example, see Patent Document 1).
[0007]
Further, regarding an optical filter device that is rotated at a high speed used in a projector or the like, in order to prevent a change in the weight balance of the transparent substrate due to high-speed rotation caused by insufficient holding strength of the transparent substrate, the hub and the transparent substrate come into contact with each other. There has been known one in which the surface is formed to be rough to increase the frictional force between the hub and the transparent substrate (for example, see Patent Document 2).
[0008]
[Patent Document 1]
JP-A-2002-58225 (paragraphs 0033 and 0038)
[Patent Document 2]
JP-A-2002-372657 (paragraph 0003, paragraph 0013 to 0015)
[0009]
[Problems to be solved by the invention]
However, in the above-described conventional color wheel balancing structure, a special device such as a drilling machine is required when the hole 76 is formed in the balance adjusting member 75, and the work of setting the color arrangement device 70 to the drilling machine or the like, It is also necessary to perform an operation of opening a hole 76 in the balance adjusting member 75 and an operation of removing the color arrangement device 70 from a drilling machine or the like. When the adhesive 77 is attached to the balance adjusting member 75, an operation of cutting the adhesive 77 to a required size, an operation of applying an adhesive to the cut adhesive 77, and a step of attaching the adhesive 77 to the balance adjusting member An operation of attaching the adhesive to the balance adjustment member 75 must be performed, and it takes time until the adhesive is dried and the adhesive 77 is fixed to the balance adjusting member 75.
[0010]
Further, these operations are repeated several times each time the balance adjustment point and the balance adjustment amount are detected by measuring the vibration during the rotation of the color wheel 71 until the balance is obtained. As described above, in the conventional color wheel balancing structure, a special device such as a drilling machine is required, and the work of adjusting the balance is poor.
[0011]
Further, in the configuration described in Patent Document 1 described above, an operation of separating an appropriate amount of putty, an operation of applying the putty, and an operation of curing the applied putty are required, resulting in poor workability. Further, in the configuration described in Patent Document 2 described above, when the transparent substrate is assembled in an unbalanced state, the adjustment of the balance is not disclosed.
[0012]
The present invention has been made in order to solve the above-mentioned problems, and by providing a releasable balance adjusting rib on a member holding a color wheel, a special tool is not required, and a general-purpose tool is used. It is an object of the present invention to provide a color wheel balancing structure of an image display projector which can easily perform balance adjustment work with good workability.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 includes a light source, a color wheel in which a plurality of color filters for coloring light emitted from the light source are arranged along a circumferential direction, and a center of the color wheel. A color wheel holding member that rotates the color wheel around the rotation axis of the motor by the driving force of the motor while holding the color wheel, and an image forming element that forms an image using light arranged by the color wheel, In the color wheel balancing structure of the image display projector, the wheel holding member has a receiving base connected to the rotating shaft of the motor, and a pressing plate for holding the color wheel between the receiving base and the receiving base of the pressing plate. A plurality of releasable balance ribs formed integrally with the holding plate by plastic on the surface opposite to A plurality of recesses provided in the circumferential direction so as to face the outer peripheral edge of the holding plate so as to form a space between each of the ribs and the holding plate; Are arranged so as to be circumferentially dispersed corresponding to the recesses and extend radially with respect to the center of the color wheel.
[0014]
In this configuration, since a plurality of releasable balance adjusting ribs made of plastic are provided on the holding plate, the balance adjusting ribs are cut off by using a general-purpose cutting tool such as a nipper, for example. Wheel balance can be adjusted. In addition, since the balance adjustment ribs extend in the radial direction with respect to the center of the color wheel, the balance adjustment ribs can be cut away from the outer peripheral side of the color wheel toward the center. Can be easily removed by the required amount. Further, a recess is provided so as to form a space between the balance adjusting rib and the holding plate, and the recess faces the outer peripheral edge of the holding plate. The balance adjusting rib can be easily cut off from the outer peripheral side by inserting the concave part into the concave part from the edge side.
[0015]
The invention according to claim 2 is a color wheel in which a light source, a plurality of color filters for arranging light emitted from the light source are arranged along a circumferential direction, and the color wheel holding a center of the color wheel. Wheel balancing member of an image display projector, comprising: a color wheel holding member for rotating an image sensor around a rotation axis of the motor by a driving force of the motor; and an image forming element for forming an image using light arranged by the color wheel. In the above, the color wheel holding member has a balance adjusting rib which can be cut off.
[0016]
In this configuration, since the balance adjustment rib that can be cut is provided on the color wheel holding member, the balance of the color wheel is cut by cutting the balance adjustment rib using a general-purpose cutting tool such as a nipper. Can be adjusted.
[0017]
According to a third aspect of the present invention, in the color wheel balancing structure for an image display projector according to the second aspect, the color wheel holding member is provided between the pedestal connected to the rotating shaft of the motor and the pedestal. A press plate for holding the wheel, and a plurality of balance adjusting ribs are provided in the circumferential direction on the surface of the press plate opposite to the pedestal, and each of the balance adjusting ribs is a color wheel. Extend radially with respect to the center.
[0018]
In this configuration, since the balance adjustment ribs extend in the radial direction with respect to the center of the color wheel, the balance adjustment ribs can be cut from the outer peripheral side of the color wheel toward the center. The necessary amount of the adjusting rib can be easily cut off.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, an image display projector 100 forms an image using a built-in image forming element based on an image signal input from a personal computer, a video camera, or the like, and projects and displays the image on a screen, a wall surface, or the like. It is.
[0020]
The image display projector 100 includes a projection lens 2 on the front surface of an exterior case 1, and projects an image formed by an image forming element from the projection lens 2. Further, the image display projector 100 includes an image projection optical system for forming an image and projecting the image from the projection lens 2 inside the outer case 1.
[0021]
Next, the image projection optical system will be described. 2, an image projection optical system 10 includes, in addition to the projection lens 2 described above, a lamp 3 as a light source, a lens 4, a color arrangement device 6 having a color wheel 5, a lens 7, and a DLP as an image forming element. (Digital Lighting Processor) 8.
[0022]
The lamp 3 emits light for image projection, and the lens 4 irradiates the light emitted from the lamp 3 to the color wheel 5 of the color arrangement device 6. The color arrangement device 6 arranges the light emitted from the lens 4 by the color wheel 5. Details of the configuration of the color arrangement device 6 will be described later. The lens 7 irradiates the DLP 8 with light arranged by the color arrangement device 6. The DLP 8 forms an image forming surface by arranging a large number of micromirrors in a matrix, and controls the angle of each micromirror by a signal from a control unit (not shown), thereby irradiating the irradiated light. Reflects to form an image. The projection lens 2 projects light reflected from the image forming surface of the DLP 8, that is, an image formed by the DLP 8, for example, on a screen 9.
[0023]
Next, the color arrangement device 6 will be described. 3 to 5, the color arrangement device 6 includes, in addition to the above-described color wheel 5, a cradle 30, a holding plate 40, and a motor 50. The cradle 30 and the holding plate 40 constitute a color wheel holding member. The color arrangement device 6 sandwiches the color wheel 5 between the receiving base 30 and the holding plate 40, and rotates the color wheel 5 together with the receiving base 30 and the holding plate 40 by the motor 50.
[0024]
The color wheel 5 is for coloring the light emitted from the lamp 3 and has an annular shape, and is composed of four glass color filters 5a and 5b of red, green, blue and white (transparent). , 5c, 5d. Each of the color filters 5a, 5b, 5c, and 5d has a substantially fan shape, and the color filters 5a, 5b, 5c, and 5d are arranged along the circumferential direction, thereby forming an annular color wheel 5. You.
[0025]
The cradle 30 is connected to the rotating shaft 51 of the motor 50 and includes a columnar convex portion 31, an annular concave portion 32, and a screw hole 33. The central axis of the convex portion 31 and the central axis of the concave portion 32 coincide with each other, and the pedestal 30 is attached to the rotating shaft 51 so that the central axis of the convex portion 31 and the concave Are linked. Therefore, the cradle 30 is rotated by the motor 50 with the central axes of the convex portions 31 and the concave portions 32 serving as rotation centers.
[0026]
The holding plate 40 is made of plastic and has an opening 41, six balance adjusting ribs 42 a to 42 f, six recesses 43 a to 43 f, and a screw groove 43. The balance adjusting ribs 42a to 42f and the recesses 43a to 43f constitute a balancing structure for adjusting the balance of the color wheel 5.
[0027]
The holding plate 40 is screwed into the screw hole 33 of the receiving base 30 via the screw groove 44 in a state where the opening 41 is fitted to the convex portion 31 of the receiving base 30, so that the holding plate 30 is attached to the receiving base 30. Fixed. Further, the holding plate 40 is fixed to the receiving base 30, so that the color wheel 5 is held between the receiving base 30 and the color wheel 5. When the holding plate 40 is fixed to the pedestal 30, the center axis of the holding plate 40 is coaxial with the center axes of the convex portion 31 and the concave portion 32 of the pedestal 30 (accordingly, the holding plate 40 is (Coaxial). That is, the holding plate 40 is designed to rotate together with the cradle 30 around the center axis of the holding plate 40 as the center of rotation.
[0028]
Here, a method of assembling and holding the color wheel 5 will be described. First, an adhesive is applied to the concave portion 32 of the cradle 30, and the color filters 5a, 5b, 5c, and 5d are adhered to the concave portion 32 in a state of being arranged along the circumferential direction. Next, an adhesive is applied to the back surface of the holding plate 40 (the surface on the side of the receiving base 30), and the opening 41 of the holding plate 40 is fitted into the convex portion 31 of the receiving base 30. It is screwed to the cradle 30. Thus, the color filters 5a, 5b, 5c, and 5d are assembled as the color wheel 5, and the assembled color wheel 5 is held in a state of being sandwiched between the holding plate 40 and the receiving base 30.
[0029]
When the color filters 5 a, 5 b, 5 c, 5 d are arranged in the recess 32 of the receiving base 30, the center axis of the color wheel 5 becomes coaxial with the center axis of the recess 32 (accordingly, of the motor 50). Is designed in advance so that the center of gravity of the color wheel 5 is located on the center axis of the color wheel 5. That is, the color wheel 5 is designed to rotate together with the cradle 30 with the center axis and the position of the center of gravity of the color wheel 5 as the center of rotation.
[0030]
Next, a description will be given of a balancing structure including the balance adjusting ribs 42a to 42f and the recesses 43a to 43f. As described above, the color wheel 5 is designed to be rotated by the motor 50 with the center axis and the position of the center of gravity of the color wheel as the center of rotation. However, the center of gravity of the color wheel 5 is centered on the design error of the color filters 5a, 5b, 5c, and 5d, and the mounting error when the color filters 5a, 5b, 5c, and 5d are mounted on the recess 32 of the receiving base 30. In some cases, the motor is assembled in a state where it is not located on the shaft or the center axis does not coincide with the center of rotation, that is, a state where the balance is not balanced. The balancing structure is a structure for adjusting to a balanced state when the color wheel 5 is assembled in an unbalanced state.
[0031]
The balance adjusting ribs 42 a to 42 f are cut out to adjust the balance of the color wheel 5, and are provided on the surface of the holding plate 40 (the side opposite to the receiving table 30), and are made of plastic. It is formed integrally with the holding plate 40. The balance adjusting ribs 42 a to 42 f are arranged in a circumferentially symmetric manner with respect to the center axis of the holding plate 40 in a point-symmetric manner. Each of the balance adjusting ribs 42a to 42f has the same shape and extends radially with respect to the central axis of the holding plate 40 (therefore, the rotation center of the color wheel).
[0032]
The recesses 43a to 43f are places where a tool for cutting the balance adjustment ribs 42a to 42f is inserted, and are provided in the circumferential direction in a manner corresponding to the balance adjustment ribs 42a to 42f. Each of the recesses 43a to 43f has the same shape, and forms a space between each of the balance adjusting ribs 42a to 42f and the pressing plate 40. Further, each of the recesses 43 a to 43 f faces the outer peripheral edge of the holding plate 40, and the space formed between the balance adjusting ribs 42 a to 42 f and the holding plate 40 is located at the outer periphery of the holding plate 40. It is open. That is, each of the balance adjusting ribs 42a to 42f has a fixed end connected to the pressing plate 40 on the center side and a free end on the outer peripheral side, and can be cut off from the outer peripheral side.
[0033]
The balance adjustment of the color wheel 5 is performed in a state where the color arrangement device 6 is assembled. For example, a vibration at the time of rotation of the color wheel 5 is measured by a vibration measuring device to detect a balance adjustment point and a balance adjustment amount, and the balance adjustment is performed. This is performed by cutting off the necessary amount of the balance adjusting ribs 42a to 42f from the outer peripheral side according to the point and the balance adjustment amount. The balance adjusting ribs 42a to 42f are cut from the outer peripheral edge side by inserting the cutting tool into the recesses 43a to 43f from the outer peripheral edge side of the holding plate 40 using a general-purpose cutting tool such as a nipper. FIG. 6 shows an example of cutting out the balance adjusting ribs 42a to 42f (an example of balance adjustment). In the illustrated example, the balance adjusting rib 42a is cut off to approximately half the length.
[0034]
According to such a balancing structure, since the plurality of balance adjusting ribs 42a to 42f which can be cut are provided on the holding plate 40, the color wheel can be easily cut only by cutting the balance adjusting ribs 42a to 42f. 5 can be adjusted. Since the balance adjusting ribs 42a to 42f extend in the radial direction with respect to the center of the color wheel 5, the balance adjusting ribs 42a to 42f can be cut from the outer peripheral side of the color wheel 5 toward the center. Thus, the necessary amount of the balance adjusting ribs 42a to 42f can be easily removed. Further, recesses 43a to 43f are provided so as to form spaces between the balance adjusting ribs 42a to 42f and the press plate 40, and the recesses 43a to 43f face the outer peripheral edge of the press plate 40. By inserting a general-purpose cutting tool such as a nipper into the recesses 43a to 43f from the outer peripheral edge side of the holding plate 40, the balance adjusting ribs 42a to 42f can be easily cut off from the outer peripheral side.
[0035]
Note that the present invention is not limited to the configuration of the above embodiment, and various modifications are possible. For example, in the above embodiment, the balance adjusting rib is not limited to plastic and may be formed of aluminum or brass. The balance adjusting ribs do not necessarily have to extend radially. The number of the ribs for balance adjustment is not limited to six, but may be one, two, or seven or more. The recess need not necessarily be provided. The color wheel is not limited to one in which four fan-shaped color filters of red, green, blue, and white (transparent) are assembled in an annular shape, and red, green, and blue are arranged in the circumferential direction of one annular member. , A white (transparent) color filter region may be formed.
[0036]
【The invention's effect】
As described above, according to the first aspect of the present invention, since a plurality of balance adjusting ribs are formed integrally with the pressing plate by plastic, the balance can be adjusted using a general-purpose cutting tool such as a nipper. It does not require special equipment such as a drilling machine. Further, the balance adjustment work only needs to cut off the balance adjustment ribs, thereby improving the workability of the balance adjustment. Further, since each of the balancing ribs extends radially with respect to the center of the color wheel, it is easy to cut off only a necessary amount, thereby further improving the workability of the balancing. In addition, since the concave portion facing the outer peripheral edge of the holding plate is provided between the rib for adjusting the balance and the pressing plate, the rib for adjusting the balance can be easily cut off from the outer peripheral side. Is further improved.
[0037]
According to the second aspect of the present invention, since the color wheel holding member is provided with the balance adjusting rib that can be cut off, the balance can be adjusted using a general-purpose cutting tool such as a nipper. It does not require any special equipment. Further, the balance adjustment work only needs to cut off the balance adjustment ribs, thereby improving the workability of the balance adjustment.
[0038]
According to the third aspect of the present invention, since the balance adjusting rib extends in the radial direction with respect to the center of the color wheel, it is easy to cut off only a necessary amount, thereby further improving the workability of the balance adjustment. I do.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of an image display projector according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an image projection optical system of the projector.
FIG. 3 is a perspective view showing a configuration of a color arrangement device having a color wheel of the projector.
FIG. 4 is a sectional view taken along the line AA of FIG. 5 showing the configuration of the same color arrangement device.
FIG. 5 is an exploded perspective view showing the configuration of the color arrangement device.
FIG. 6 is a perspective view showing an example of balance adjustment of the same color arrangement device.
FIG. 7A is a perspective view showing a balance adjustment example of a conventional color arrangement device having a color wheel, and FIG. 7B is a perspective view showing another balance adjustment example.
[Explanation of symbols]
1 outer case 2 projection lens 3 lamp (light source)
Reference Signs List 5 Color wheel 5a, 5b, 5c, 5d Color filter 6 Color arrangement device 8 DLP (image forming element)
30 Cradle (color wheel holding member)
31 convex part 32 concave part 40 holding plate (color wheel holding member)
41 Openings 42a to 42f Balance adjusting ribs 43a to 43f Recess 50 Motor 51 Rotation axis 100 Image display projector

Claims (3)

A light source; a color wheel in which a plurality of color filters for coloring light emitted from the light source are arranged along a circumferential direction; and a driving force of a motor that holds the center of the color wheel and drives the color wheel. A color wheel holding member that rotates around a rotation axis of the motor, and an image forming element that forms an image using light arranged by the color wheel, wherein the color wheel holding member includes a rotation shaft of the motor. In the color wheel balancing structure of the image display projector having a receiving base connected to the, and a pressing plate that sandwiches the color wheel between the receiving base,
A plurality of releasable balance adjusting ribs formed integrally with the holding plate by plastic on the surface of the holding plate opposite to the receiving table;
A plurality of recesses distributed in the circumferential direction facing the outer peripheral edge of the holding plate so as to form a space between each of the balance adjusting ribs and the holding plate,
Each of the plurality of balancing ribs is circumferentially dispersed corresponding to the recess, and is arranged so as to extend radially with respect to the center of the color wheel. Color wheel balance structure for image display projector. A light source; a color wheel in which a plurality of color filters for coloring light emitted from the light source are arranged along a circumferential direction; and a driving force of a motor that holds the center of the color wheel and drives the color wheel. In a color wheel balancing structure of an image display projector including a color wheel holding member that rotates around a rotation axis of a motor, and an image forming element that forms an image using light arranged by the color wheel,
A color wheel balancing structure for an image display projector, wherein the color wheel holding member includes a releasable balance adjusting rib. The color wheel holding member has a pedestal connected to the rotation shaft of the motor, and a pressing plate that sandwiches the color wheel between the pedestal,
A plurality of the ribs for balance adjustment are provided in a circumferential direction on the surface of the holding plate opposite to the cradle, and a plurality of the ribs for balance adjustment are provided in a radial direction with respect to the center of the color wheel. The color wheel balancing structure for an image display projector according to claim 2, wherein the color wheel balance structure is extended.

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