JP4806932B2 - projector - Google Patents

Description

  The present invention relates to a projector.

  In recent years, light emitted from a lamp or the like is transmitted through a color wheel, and the transmitted light is reflected by a DMD (Digital Micromirror Device), which is a digital reflection integrated device, to generate a color image. There has been proposed a DLP (Digital Light Processor) projector that displays an image by magnifying and projecting onto the screen.

In the projector as described above, there is a demand for displaying an image brighter. On the other hand, various methods for displaying a brighter image have been proposed in the past, for example, as disclosed in Patent Document 1.
JP 2004-219787 A

  However, even if the conventional method as described in Patent Document 1 is used, the brightness of the display image may be insufficient. On the other hand, the present inventor has paid attention to that an image can be displayed more brightly by increasing the usable time while the color wheel rotates once.

In a color wheel, the boundary portion between adjacent different colors transmits light of a plurality of colors and the colors are mixed. Therefore, the light is used for a predetermined time while the boundary portion passes in front of the lamp. It is in a state that can not be.
For this reason, in the color wheel, it is considered that an image can be displayed more brightly by shortening a time during which colors cannot be mixed and shortening a time during which usable single color light is transmitted. It came to.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a projector that can display a brighter image by extending the time for transmitting monochromatic light that can be used by a color wheel.

In order to solve the above problems, the invention according to claim 1 is a projector,
A lamp that emits light;
A color wheel disposed adjacent to the lamp and transmitting light emitted from the lamp;
An integrator for making the light transmitted through the color wheel incident from an entrance and making the light uniform;
With
The shape of the entrance of the integrator viewed from above the color wheel is a substantially rectangular shape,
The color wheel is provided with a fan-shaped region having a size that can accommodate the entire rectangular entrance of the integrator.
A straight line passing through the center at the entrance of the integrator and the center of the short side of the entrance coincides with a line connecting the center of the color wheel and the center of the entrance when viewed from above the color wheel. The integrator is arranged such that the central angle is smaller than the central angle of the sector of the color wheel .

According to the invention described in this way in claim 1, mosquitoes color wheel by transmitting monochromatic light with a smaller range in the circumferential direction can be made incident on the integrator, thereby having the same size and same shape The color wheel can be used for a longer time.

According to a second aspect of the present invention, in the projector according to the first aspect,
Viewed from above the color wheel, and a straight line passing through the center of the short side at the center, and the entrance of the substantially rectangular entrance, a line connecting the centers of and the entrance of the color wheel, the other than 0 degree It is characterized by an angle.

Thus, according to the invention described in claim 2, concrete to be able to enter the more integrator by transmitting monochromatic light in a small range in the circumferential direction of the color wheel, and thereby the same size The usable time can be extended even with the color wheel having the same shape.

The invention according to claim 3 is the projector according to claim 1 or 2 ,
Viewed from above the color wheel, one of the long sides of the substantially rectangular entrance of the integrator, is to overlap the center line connecting a point on the circumference of the center and the color wheel of the color wheel It is characterized by that.

Thus, according to the invention of claim 3, concrete to be able to enter the more integrator by transmitting monochromatic light in a small range in the circumferential direction of the color wheel, and thereby the same size The usable time can be extended even with the color wheel having the same shape.

  According to the present invention, it is possible to transmit monochromatic light in a smaller range in the circumferential direction of the color wheel and to enter the integrator, thereby extending the usable time even with a color wheel of the same size and shape. Therefore, an image can be displayed more brightly. In addition, since only the arrangement position of the integrator is adjusted, the image can be brightened by a simple method.

  Hereinafter, an embodiment of a projector according to the present invention will be described with reference to the drawings. However, the following is one embodiment of the present invention and does not limit the present invention.

FIG. 1 is a perspective view of an embodiment of the projector according to the present invention as viewed from above, and FIG. 2 is a perspective view of the projector of FIG. 1 as viewed from the front.
3 is a schematic view showing the arrangement positions of the color wheel and the entrance of the integrator provided in the projector of FIG. 1, and FIG. 4 shows other arrangement positions of the color wheel and the entrance of the integrator. It is the schematic which shows an example.
FIG. 5 is a schematic view showing the arrangement positions of the conventional color wheel and the entrance of the integrator.

  First, the configuration of the projector 1 in this embodiment will be described with reference to FIGS. 1 and 2.

  As shown in FIG. 1, the projector 1 according to the present embodiment generates a predetermined shape by generating a rectangular parallelepiped housing 10, a lamp unit 20, a transmissive color wheel 30 that transmits light emitted from the lamp unit 20, and an image. Lens unit 40 for projecting in the direction of, and a power supply board 50 on which various circuit components and a battery are mounted.

  As shown in FIG. 1, the housing 10 includes a rectangular upper surface 11 and a lower surface 12 having a relatively large area, and four side surfaces 13 connected to the sides of the upper surface 11 and the lower surface 12. ing. The lamp unit 20 includes a lamp 21 that emits light, a reflector 22 that reflects light from the lamp 21 and focuses it in a predetermined direction, a cover glass 23 that protects the front surface of the lamp 21, and the like. As shown, it is disposed at a position near the rear of the substantially central portion in the left-right direction inside the housing 10. The lighting operation of the lamp unit 20 is controlled by a control circuit mounted on the power supply board 50.

  The color wheel 30 is driven and rotated by a predetermined motor and transmits light emitted from the lamp unit 20 to transmit light from the lamp unit 20 in red (R), green (G), and blue (B). The light is sequentially converted into light. As shown in FIG. 1, the color wheel 30 is disposed at a position adjacent to the left side of the lamp unit 20, and its rotation operation is controlled by a control circuit mounted on the power supply board 50.

  The lens unit 40 includes an integrator (light guide tube) 60 that guides light transmitted through the color wheel 30, DMD and DMD that are angle-controllable digital reflection integrated elements that generate light by reflecting the light that has passed through the color wheel 30. A DMD substrate that controls the operation of the projector, a projection lens that projects light (image) generated by the DMD in a predetermined direction, and the like. As shown in FIG. 1, the lens unit 40 is arranged in a space between the color wheel 30 and the left side surface 13 of the housing 10 and projects an image in front of FIG. 1.

  The integrator 60 is a hollow rectangular parallelepiped member, for example, and the inner surface is covered with a reflecting member. The color wheel 30 has a substantially rectangular entrance 61, and light transmitted through the color wheel 30 enters the integrator 60 from the entrance 61 and is reflected by the reflecting member. The light is made uniform and emitted from the opposite exit (not shown).

  As shown in FIG. 1, the power supply board 50 is disposed in front of the lamp unit 20, and includes a control circuit that controls the lighting operation of the lamp unit 20 and the rotation operation of the color wheel 30, and power to various electronic devices. A battery for supplying the battery is provided.

Next, the color wheel 30 and the integrator 60 provided in the projector 1 according to the present embodiment will be described in detail with reference to FIGS.
As shown in FIG. 3, the color wheel 30 in the present embodiment is provided with a predetermined range of each color filter so as to convert it into red (R), green (G), and blue (B) light. . In the present embodiment, a transparent (W) portion that allows light from the lamp to pass therethrough is also provided.

  The lamp unit 20, the color wheel 30, and the integrator 60 are arranged in such a positional relationship that light from the lamp unit 20 passes through the color wheel 30 and enters the incident port 61 of the integrator 60. The entrance 61 of the integrator 60 has a substantially rectangular shape, and a straight line L passing through the center Q of the substantially rectangular entrance and the center of the short side of the entrance is the center of the color wheel 30. It is adjusted so as to be shifted by a predetermined angle from a line connecting P and the center Q of the entrance 61. As a result, as in the conventional color wheel 230 shown in FIG. 5, a straight line L passing through the center Q of the substantially rectangular entrance 261 of the integrator and the center of the short side of the entrance is the center P of the color wheel 230. And the entire incident port 61 of the integrator 60 as compared with the fan-shaped central angle α3 of the color wheel 230 that fits the entire incident port 261 of the integrator. The fan-shaped central angle α1 of the color wheel 30 that is large enough to accommodate can be reduced.

  The positional relationship between the integrator entrance and the color wheel is such that one of the long sides T of the substantially rectangular entrance 161 overlaps the center line PS of the color wheel 130, as shown in FIG. It is more preferable. This makes it possible to further reduce the fan-shaped central angle α2 of the color wheel 130 that is large enough to accommodate the entire incident port 161 of the integrator.

Next, the operation of the projector 1 according to this embodiment will be described.
First, when the power switch of the projector 1 is turned on and the lamp unit 20 is operated, light is emitted from the light emitting portion of the lamp 21, and the light is reflected by the reflecting surface of the reflector 22, and the direction of the color wheel 30. Head for.
The color wheel 30 rotates at a predetermined speed, and the light from the lamp unit 20 passes through the color wheel 30 and enters the integrator 60. At this time, the positional relationship between the color wheel 30 and the substantially rectangular entrance 61 of the integrator 60 is such that the straight line L passing through the center Q at the entrance 61 of the integrator 60 and the center of the short side at the entrance 61 is the color wheel. Since the center angle α1 of the color wheel is adjusted to be shifted by a predetermined angle from the line connecting the center P of the center 30 and the center Q of the entrance 61, the center angle α1 of the color wheel is small enough to fit the entrance 61 of the integrator 60. Thus, when the color wheel 30 is rotating at the same speed, it is possible to transmit monochromatic light for a longer time than in the prior art. Thereafter, the light emitted from the integrator 60 passes through the lens unit 40 and projects an image in front of FIG.

  As described above, according to the projector of the present embodiment, the lamp that emits light, the color wheel that is disposed adjacent to the lamp and transmits the light emitted from the lamp, and the light that has passed through the color wheel is incident. And an integrator that makes the light uniform by entering from the mouth, and the position of the integrator entrance on the color wheel so that the central angle of the fan shape of the color wheel is small enough to fit the whole entrance of the integrator. Therefore, it is possible to transmit light of a single color in a smaller range in the circumferential direction of the color wheel and to enter the integrator, so that the same size and shape of the color wheel can be used. Can be long.

  Further, in this embodiment, the shape of the entrance of the integrator viewed from above the color wheel is substantially rectangular, and a straight line passing through the center of the substantially rectangular entrance and the center of the short side of the entrance is the color wheel. Since it is shifted by a predetermined angle from the line connecting the center and the center of the entrance, specifically, it is possible to transmit monochromatic light in a smaller range in the circumferential direction of the color wheel and to enter the integrator. Even when the color wheel has the same size and shape, the usable time can be extended.

  Furthermore, when the shape of the entrance of the integrator as viewed from above the color wheel is substantially rectangular, and one of the long sides of the substantially rectangular entrance is overlapped with the center line of the color wheel, In a circumferential direction of the color wheel, light of a single color can be transmitted in a smaller range and incident on the integrator, so that a usable time can be extended even with a color wheel having the same size and shape.

  As a result, an image can be displayed brighter. In addition, since only the arrangement position of the integrator is adjusted, the image can be brightened by a simple method.

  The projector according to the present invention is not limited to the above-described embodiment, but can be applied to other configurations.

1 is a perspective view of an embodiment of a projector according to the present invention as viewed from above. FIG. 2 is a perspective view when the projector of FIG. 1 is viewed from the front. It is the schematic which shows the arrangement position of the color wheel with which the projector of FIG. 1 was equipped, and the entrance of an integrator. It is the schematic which shows the other example of the arrangement position of the color wheel and the entrance of an integrator. It is the schematic which shows the arrangement position of the conventional color wheel and the entrance of an integrator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 10 Case 20 Lamp unit 21 Lamp 22 Reflector 23 Cover glass 30, 130 Color wheel 40 Lens unit 50 Power supply board 60 Integrators 61, 161 Entrance

Claims (3)

A lamp that emits light;
A color wheel disposed adjacent to the lamp and transmitting light emitted from the lamp;
An integrator for making the light transmitted through the color wheel incident from an entrance and making the light uniform;
With
The shape of the entrance of the integrator viewed from above the color wheel is a substantially rectangular shape,
The color wheel is provided with a fan-shaped region having a size that can accommodate the entire rectangular entrance of the integrator.
A straight line passing through the center at the entrance of the integrator and the center of the short side of the entrance coincides with a line connecting the center of the color wheel and the center of the entrance when viewed from above the color wheel. The projector is characterized in that the integrator is arranged so that the central angle is smaller than the central angle of the fan-shaped color wheel . Viewed from above the color wheel, and a straight line passing through the center of the short side at the center, and the entrance of the substantially rectangular entrance, a line connecting the centers of and the entrance of the color wheel, the other than 0 degree The projector according to claim 1, wherein the projector has an angle. Viewed from above the color wheel, one of the long sides of the substantially rectangular entrance of the integrator, is to overlap the center line connecting a point on the circumference of the center and the color wheel of the color wheel the projector according to claim 1 or 2, characterized in that.

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