JPH11202408A - Projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the projector device which can finely adjust the positions of lights of three primary colors and project high-definition video free of registration deviation. SOLUTION: The R, G, and B lights of three primary colors are made incident on liquid crystal panels 12 to 14 and combined by a combining prism 15. Plate type transparent members 22 to 24 are arranged between the liquid crystal panels 12 to 14 and combining prism 15. The angles of the plate type transparent members 22 to 24 to the optical axes are adjusted at least in a uniaxial direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector apparatus such as a liquid crystal projector, and more particularly to a projector apparatus capable of finely adjusting the positions of light of three primary colors and displaying a high-definition image without registration deviation. The present invention relates to a projector device capable of performing the following.

[0002]

2. Description of the Related Art Since there is an increasing demand for displaying images on a large screen, projector devices for projecting images on a screen are gradually becoming widespread. FIG. 6 is a diagram showing a general configuration of the projector device. Here, the configuration of the liquid crystal projector is shown, and its operation will be described.

In FIG. 6, light emitted from a lamp 1 is condensed by condenser lenses 2 and 3 and is incident on a cold mirror 4. The light reflected by the cold mirror 4 enters the color separation mirror 5. Of the light incident on the color separation mirror 5, red (R) light passes through the color separation mirror 5 and is incident on the mirror 6. This R light is reflected by the mirror 6 and enters the liquid crystal panel 12.

[0004] The blue (B) / green (G) light is reflected by the color separation mirror 5 and enters the color separation mirror 7. Among the light incident on the color separation mirror 7, the G light is reflected by the color separation mirror 7 and is incident on the liquid crystal panel 13. Of the light that has entered the color separation mirror 7, the B light passes through the relay lens 8, the mirror 9, the relay lens 10, and the mirror 11 to adjust the optical path length to the optical path length of the R light and the G light. Is incident on.

As is well known, a voltage corresponding to an image is applied to the liquid crystal panels 12 to 14, and R, G,
The B lights are respectively modulated. The light of each color output from the liquid crystal panels 12 to 14 is combined by the combining prism 15 and projected on the screen 17 by the projection lens 16. Thus, an image is displayed on the screen 17.

In this type of projector apparatus, if the positioning of the R, G, and B lights of the three primary colors is not accurately performed, a registration error occurs, and the quality of an image displayed on the screen 17 is impaired. . Therefore, R,
It is necessary to accurately align the G and B lights and project them onto the screen 17. Therefore, the liquid crystal panels 12 to
For example, the optical component 14 may be attached to an optical base having high rigidity and fixed by an adhesive. Then, the cost rises, and it is not possible to provide an inexpensive projector device, but it is not possible to cope with the positional deviation of the liquid crystal panels 12 to 14 due to a temperature difference, an impact or the like.

Therefore, it is general to provide an angle (position) adjusting mechanism on the liquid crystal panels 12 to 14 to adjust the angles and positions of the liquid crystal panels 12 to 14, thereby aligning the R, G, and B lights. is there. Conventional LCD panel angle (position)
As an adjustment mechanism, as an example, see Japanese Patent Application Laid-Open No. H6-111003.
There is a technique described in Japanese Patent Laid-Open Publication No. 2 (1995) -210.

[0008]

However, in recent projector devices, the liquid crystal panels 12 to 14 have been downsized to improve the definition of an image and to downsize the device. As the size of the liquid crystal panels 12 to 14 is reduced, a slight displacement of the liquid crystal panels 12 to 14 greatly affects a projected image on the screen 17, and a registration shift occurs. R of three primary colors,
It is necessary to finely adjust the positions of the G and B lights on the order of microns, but it has been extremely difficult with the conventional technology.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and a projector capable of finely adjusting the positions of light of three primary colors and projecting a high-definition image without registration deviation. It is intended to provide a device.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention modulates light of each of the three primary colors obtained from light emitted for displaying an image on a screen. In a projector device including a modulation element and a synthesis prism that synthesizes light of three primary colors output from the light modulation element, a plate-shaped transparent member disposed between the light modulation element and the synthesis prism; An object of the present invention is to provide a projector device, wherein the plate-shaped transparent member is provided with an angle adjusting mechanism for adjusting an angle in at least one axial direction with respect to the optical axis.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a projector device according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a view showing an embodiment of the projector device of the present invention, FIG. 2 is a perspective view showing an example of an angle adjusting mechanism of the plate-shaped transparent members 22 to 24 in FIG. 1, and FIG. FIG. 4 is a side view for explaining an angle adjusting mechanism of the transparent members 22 to 24, FIG. 4 is a diagram for explaining the principle of the present invention, and FIG. 5 is a plate-like transparent member 22 in FIG.
It is a side view which shows other examples of the angle adjustment mechanism of No.-24.
In FIG. 1, the same parts as those in FIG. 6 are denoted by the same reference numerals.

First, the overall configuration of the projector device of the present invention will be described with reference to FIG. In FIG. 1, light emitted from a lamp 1 is collected by condenser lenses 2 and 3 and is incident on a cold mirror 4. The light reflected by the cold mirror 4 enters the color separation mirror 5. Of the light incident on the color separation mirror 5, red (R) light passes through the color separation mirror 5 and is incident on the mirror 6. This R light is reflected by the mirror 6 and enters the liquid crystal panel 12.

The blue (B) / green (G) light is reflected by the color separation mirror 5 and enters the color separation mirror 7. Among the light incident on the color separation mirror 7, the G light is reflected by the color separation mirror 7 and is incident on the liquid crystal panel 13. Of the light that has entered the color separation mirror 7, the B light passes through the relay lens 8, the mirror 9, the relay lens 10, and the mirror 11 to adjust the optical path length to the optical path length of the R light and the G light. Is incident on.

As is well known, a voltage corresponding to an image is applied to the liquid crystal panels 12 to 14, and R, G,
The B lights are respectively modulated. The light of each color output from the liquid crystal panels 12 to 14 is incident on the combining prism 15 via the plate-like transparent members 22 to 24 newly added according to the present invention. The R, G, and B lights from the plate-shaped transparent members 22 to 24 are combined by the combining prism 15, and
The light is projected on a screen 17 by a projection lens 16.
Thus, an image is displayed on the screen 17.

As described above, in the configuration of the present invention, the R, G, and B are provided between the liquid crystal panels 12 to 14 and the combining prism 15.
It is characterized in that plate-shaped transparent members 22 to 24 for refracting light are provided. In this embodiment, as the most preferred embodiment, the plate-shaped transparent members 22 to 24 are provided for the liquid crystal panels 12 to 14, respectively.
Alternatively, a plate-shaped transparent member may be provided only on one liquid crystal panel.

The plate-shaped transparent members 22 to 24 are provided with an angle (position) adjusting mechanism for the plate-shaped transparent members 22 to 24 as described below.

An example configuration of the angle adjusting mechanism of the plate-shaped transparent members 22 to 24 will be described with reference to FIG. In FIG.
The plate-shaped transparent members 22 to 24 are held and held by, for example, four spring members 32 on a frame-shaped member 31 having an opening 31a. The four corners of the frame member 31 are provided with screw holes 31b, respectively, and the frame member 31 is screwed and fixed to an optical base (not shown).

As shown in the side view of FIG.
The frame-like member 3 is positioned from the back side with which the first spring member 32 abuts.
A screw 33 is screwed through a screw hole provided in the screw 1. The screw 33 is in contact with the rear surfaces of the plate-shaped transparent members 22 to 24. It is desirable that the tip of the screw 33 be rounded so as not to damage the plate-shaped transparent members 22 to 24. The screw 33 may be provided for all the spring members 32, or may be provided only for three, two, or one spring member 32.

The tip of the screw 33, which is a pressing point on the inner surface side of the plate-shaped transparent members 22 to 24, and the plate-shaped transparent members 22 to
The pressing portion of the resilient member 32, which is a pressing point on the outer surface side of 24, is located at a position facing the transparent members 22 to 24 via the plate-shaped transparent members 22 to 24. In other words, the tip portion of the screw 33 and the pressing portion of the spring member 32 are substantially at the same position in a direction orthogonal to the plane of the plate-shaped transparent members 22 to 24.

As can be seen from FIG. 3, the angle of the plate-shaped transparent members 22 to 24 with respect to the optical axis can be arbitrarily adjusted by adjusting the screwing amount by screwing or loosening the screw 33 with an adjusting tool (not shown) or the like. Can be adjusted.

In the configuration shown in FIG. 2, when the screws 33 of the upper and lower spring members 32 in the drawing are adjusted, the angles of the plate-shaped transparent members 22 to 24 in the A and B directions in the drawing are adjusted. Thereby, the angle of the plate-shaped transparent members 22 to 24 can be adjusted in a so-called uniaxial direction. When the screws 33 of the left and right spring members 32 in the drawing are adjusted, the angles of the plate-shaped transparent members 22 to 24 in the C and D directions in the drawing are adjusted. Thereby, the plate-shaped transparent member 22
24 can be adjusted in the other one axis direction, and the angle can be adjusted in the two axis directions.

In this embodiment, an angle adjusting mechanism using four spring members 32 and screws 33 is provided, and the positions of the plate-shaped transparent members 22 to 24 in the surface direction can be adjusted. In addition, if the position adjustment in only one axial direction is sufficient, the screw 33 may be provided only for one spring member 32. In the present embodiment, the plate-shaped transparent members 22 to 24 are held by the four spring members 32, but the plate-shaped transparent members 22 to 24 are held by the three spring members 32.
24 may be held. In any case, at least one
An angle adjusting mechanism for the plate-shaped transparent members 22 to 24 in the axial direction may be provided, and more preferably, an angle adjusting mechanism in the biaxial direction is provided.

In the structure of the present invention provided with the plate-shaped transparent members 22 to 24 and the angle adjusting mechanism as described above, R,
The principle of the position adjustment of the G and B lights will be described with reference to FIG. In FIG. 4, it is assumed that the thickness of the plate-shaped transparent members 22 to 24 is t, the refractive index is N, and the plate-shaped transparent members 22 to 24 are inclined by an angle θ from the position shown by the solid line to the position shown by the broken line. Then, the optical axis L1 indicated by the solid line is shifted in parallel by σ according to the law of refraction, and becomes the optical axis L2 indicated by the one-dot chain line.

When the angle θ is very small, the deviation σ is given by the following equation (1) according to the paraxial theory. σ = (1-1 / N) × t × θ (1)

As described above, by adjusting the angles of the plate-shaped transparent members 22 to 24 with respect to the optical axis by the angle adjusting mechanism, the optical axis can be arbitrarily finely adjusted. Since the configuration does not adjust the angles of the liquid crystal panels 12 to 14, the positions of the R, G, and B lights can be finely adjusted on the order of microns. As a result, a high-definition image without registration deviation can be displayed.

In addition, the spring member 32 and the screw 3
The angle adjusting mechanism of the plate-shaped transparent members 22 to 24 according to 3 is small, has a small number of parts, is easy to assemble, and can be realized at low cost.

FIG. 5 shows another embodiment of the angle adjusting mechanism for the plate-shaped transparent members 22 to 24. In FIG. As shown in FIG. 5, the frame-shaped member 31 'has an opening 31a and a cut-and-raised portion 31.
c. This cut-and-raised part 31c
The screw 33 is screwed through a screw hole provided in the screw 33, and the screw 33 is in contact with a wedge-shaped member 34. The plate-shaped transparent members 22 to 24 are arranged so as to be sandwiched between wedge-shaped members 34, and are pressed and held by a spring member similar to the spring member 32 (not shown).

In this configuration, by adjusting the screwing amount of the screw 33, the wedge-shaped member 34 moves up and down in the drawing, and the angles of the plate-shaped transparent members 22 to 24 are adjusted.

In this embodiment, the screw 33 is used as an angle adjusting mechanism for the plate-shaped transparent members 22 to 24, but the screw 33 may be driven by a motor. Further, instead of the screw 33, a piezoelectric element actuator, a combination of a bimetal and a heater, or
A combination of a shape memory alloy and a heater may be used.

Further, in this embodiment, a so-called liquid crystal projector having liquid crystal panels 12 to 14 as light modulating elements has been described, but a DMD (Digital Mirror Device) is used.
The present invention can be applied to a projector device using another light modulation element referred to as e). A configuration in which a plate-shaped transparent member that refracts R, G, and B light is provided between a light modulation element that modulates R, G, and B light and a combining prism that combines the R, G, and B light. Good.

[0031]

As described in detail above, the projector device of the present invention includes a plate-shaped transparent member disposed between a light modulation element (for example, a liquid crystal panel) and a combining prism.
Since the plate-shaped transparent member is provided with an angle adjusting mechanism for adjusting an angle in at least one axis direction with respect to the optical axis,
The position of the light of the three primary colors can be finely adjusted, and a high-definition image without registration deviation can be displayed.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

FIG. 2 is a perspective view showing an example of an angle adjusting mechanism of the plate-shaped transparent members 22 to 24 in FIG.

FIG. 3 is a side view for explaining an angle adjusting mechanism of the plate-shaped transparent members 22 to 24 in FIG.

FIG. 4 is a diagram for explaining the principle of the present invention.

FIG. 5 is a side view showing another example of the angle adjusting mechanism of the plate-shaped transparent members 22 to 24 in FIG.

FIG. 6 is a diagram illustrating a general configuration of a projector device.

[Explanation of symbols]

 12-14 Liquid crystal panel 15 Synthetic prism 22-24 Plate-shaped transparent member 31, 31 'Frame-shaped member 32 Spring-like member 33 Screw 34 Wedge-shaped member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G02F 1/1347 G02F 1/1347 H04N 5/74 H04N 5/74 A 9/31 9/31 C

Claims (2)

[Claims] 1. A light modulating element for modulating light of three primary colors obtained from light emitted for displaying an image on a screen, and synthesizing light of the three primary colors outputted from the light modulating element. In a projector device including a prism, a plate-shaped transparent member disposed between the light modulation element and the combining prism; and an angle for adjusting the angle of the plate-shaped transparent member in at least one axial direction with respect to an optical axis. A projector device provided with an adjusting mechanism. 2. The projector according to claim 1, wherein said light modulation element is a liquid crystal panel.