JPH0571818U - Liquid crystal projector optical system parts mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] To improve workability during assembly and suppress deterioration of product performance. [Structure] Located on the projection side of the liquid crystal panels 5, 7 and 10.
Synthetic dichroic mirrors 6 and 12, total reflection mirror 1
1 and each mounting portion 21, 22, 24, 2 of the projection lens 13
3 is integrally molded as a base frame 25, and the dichroic mirrors 6 and 12 for synthesis, the total reflection mirror 11 and the projection lens 13 are attached respectively. At the time of assembly, the base frame 25 is fixed to the substrate 14 of the projector.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid crystal projector that separates white light into three primary colors, modulates each with a liquid crystal panel (LCD), and then synthesizes them together to project a full-color image.

[0002]

[Prior Art]

 Conventionally, the above-mentioned liquid crystal projector is known as a device for displaying a television image, an output image of a personal computer, a word processor, or the like on a liquid crystal panel and projecting the enlarged image as it is. As an example of a conventional liquid crystal projector, there is one having a structure as shown in the schematic front view of FIG. That is, the white light emitted from the light source 1 is transmitted through the separating dichroic mirror 2 as red light, and the reflected light is reflected through the separating dichroic mirror 3 as blue light while transmitting green light. Then, the red light is reflected by the total reflection mirror 4, then transmitted through the liquid crystal panel 5, transmitted through the combining dichroic mirror 6, and the blue light transmitted through the liquid crystal panel 7 is reflected by the dichroic mirror 6. The red light and the blue light are combined at. In addition, the green light is transmitted through the liquid crystal panel 10 and then reflected by the total reflection mirror 11, and then transmitted through the combining dichroic mirror 12, but the red and blue combined light is reflected by the dichroic mirror 12 to cause three Colored light is combined. The combined light is enlarged and projected as a full-color image on a screen (not shown) via the projection lens 13.

When assembling such a liquid crystal projector, as shown in FIG. 3 and FIG. 4 which is a sectional view taken along the line BB, a dichroic mirror mounting plate is provided between the substrate 14 and the pressing plate 15 of the projector. 16, 17, the projection lens mounting plate 18 and the total reflection mirror mounting plate 19 are screwed in advance, and the dichroic mirrors 6 and 12, the projection lens 13 and the total reflection mirror 11 are incorporated therein. .. Also, other optical system components such as the light source 1, the dichroic mirrors 2 and 3 for separation, and the total reflection mirror 4 are similarly fixed between the substrate 14 and the pressing plate 15 via a mounting plate (not shown). Was there. Moreover, these optical system parts are precisely positioned and aligned so that the images of the three liquid crystal panels 5, 7 and 10 can be projected as one image without color shift. There must be.

[0004]

[Problems to be solved by the device]

 However, in such a mounting structure, mechanical and optical jigs are used during assembly to adjust the mounting position and angle of each mounting plate, and then the screws are screwed together to tighten the screws to secure the mounting position and angle. It was difficult to adjust the position and angle, and the tightening work had to be done again. Therefore, it took a lot of time and effort for the adjustment, and the workability was poor. In addition, the position and angle of each mounting plate may be misaligned due to vibration or drop of the liquid crystal projector after assembly. In particular, the mounting position and angle of optical system parts such as the dichroic mirrors 6 and 12 for synthesis, the projection lens 13 and the total reflection mirror 11 which are located on the projection side (screen side) optical path from the liquid crystal panels 5, 7 and 10 are not changed. In that case, there is a drawback that the quality of the projected image is significantly adversely affected by the occurrence of color misregistration and the reduction in resolution, which deteriorates the performance of the liquid crystal projector.

In view of the above problems, the present invention provides an optical system component mounting structure for a liquid crystal projector, which can easily and accurately mount and fix an optical system component located on a projection side optical path from a liquid crystal panel. The purpose is to

[0006]

[Means for Solving the Problems]

 The optical system component mounting structure of the liquid crystal projector according to the present invention is such that the projection light from the light source is separated into the three primary color lights by the separating dichroic mirror, and the color lights of each optical path are transmitted through the liquid crystal panel respectively, and then the combining dichroic mirror and all In a liquid crystal projector that is composed again through a reflection mirror and projected through a projection lens, the combining dichroic mirror, total reflection mirror, and projection lens are attached to a molded base frame. It is what

[0007]

[Action]

 At the time of assembling the liquid crystal projector, the dichroic mirror for synthesis, the total reflection mirror and the projection lens are mounted on the base frame that is integrally molded in advance, so it is sufficient to adjust the position when mounting the base frame inside the projector. It is not necessary to individually adjust the position and angle of these optical system parts when installing them in the liquid crystal projector, and the installation work can be completed quickly and easily. Moreover, since the dichroic mirror for synthesis, the total reflection mirror and the projection lens are located on the projection side of the liquid crystal panel, each light including image information after passing through each liquid crystal panel can be accurately synthesized and imaged. Be seen.

[0008]

【Example】

 A preferred embodiment of the present invention will be described below with reference to FIGS. 1 and 2, but the same parts or members as those in the above-described conventional art will be designated by the same reference numerals and the description thereof will be omitted. 1 is a schematic configuration diagram showing each optical system of the liquid crystal projector according to the present embodiment, and FIG. 2 is a sectional view taken along the line AA of FIG. In FIG. 1, the dichroic mirror mounting portions 21 and 22, the projection lens mounting portion 23, and the total reflection mirror mounting portion 24, which are located in the optical paths on the projection side (screen side) of the liquid crystal panels 5, 7, and 10, are the dichroic for synthesis. The mirrors 6 and 12, the projection lens 13 and the total reflection mirror 11 are integrally molded as a base frame 25 so that they can be attached to each other at a predetermined angle and position on the optical path (see FIG. 2). The combining dichroic mirror 6 is mounted on the dichroic mirror mounting portion 21, the combining dichroic mirror 12 is mounted on the dichroic mirror mounting portion 22, the total reflection mirror 11 is mounted on the total reflection mirror mounting portion 24, and the projection lens 13 is mounted on the projection lens. They are fixed to the parts 23, respectively.

Therefore, if the base frame 25 is fixed at a predetermined position on the substrate 14, these optical systems are simultaneously adjusted in angle and position. Further, the dichroic mirrors 2, 3 for separation between the liquid crystal panels 5, 7, 10 and the light source 1 and the total reflection mirror 4 are individually screwed between the substrate 14 and the pressing plate 15 as in the prior art. Although it is stopped, each mounting plate and the like are omitted in the figure.

Since this embodiment is configured as described above, the base frame 25 to which the dichroic mirrors 6 and 12 for synthesis, the total reflection mirror 11 and the projection lens 13 are respectively fixed is assembled at the time of assembling the liquid crystal projector. If fixed at a predetermined position on the substrate 14, the combining dichroic mirrors 6, 12, the total reflection mirror 11, and the projection lens 13 are positioned at the same time. Therefore, there is no need to adjust the angle and position individually. Further, since the separation dichroic mirrors 2, 3 and the total reflection mirror 4 are individually screwed to the pressing plate 15, their angles and positions may be slightly deviated from the regular positions by tightening the screws. Since it is at the position before it passes through the liquid crystal panel, some deviation does not significantly affect the quality of the projected image such as resolution and color shift.

Therefore, when the liquid crystal panels 5, 7, and 10 are enlarged and projected by this liquid crystal projector, the luminous flux of each color light transmitted through the liquid crystal panels 5, 7, and 10 is reflected by the total reflection mirror 11 and is combined. The dichroic mirrors 6 and 12 pass through and reflect the light to precisely combine them, and the projection lens 13 projects the magnified image with a good resolving power.

As described above, in the present embodiment, when assembling the liquid crystal projector, it is not necessary to individually adjust the position and angle of the optical system components on the projection side of the liquid crystal panels 5, 7, and 10, and the adjustment is performed. It can be done easily and workability can be improved. Further, since the respective mounting parts are integrally molded, even if vibrations, drops, etc. occur after assembly, the respective optical system parts will not be displaced, and deterioration of product performance can be prevented.

In the above-described embodiment, the optical system parts between the liquid crystal panels 5, 7, 10 and the light source 1 are individually fixed by screws or the like, but these optical system parts are also attached. The plate may be attached to an integrally molded base frame (or the base frame may be integrated with the base frame 25). With such a configuration, at the time of assembly, it is only necessary to adjust the position and angle between the two base frames and attach and fix each to the board 14, so that the assembling work and the adjusting work can be further facilitated. The quality of the projected image can be further improved.

[0014]

[Effect of the device]

 As described above, since the optical system mounting structure of the liquid crystal projector according to the present invention is such that at least the combining dichroic mirror and the projection lens are mounted on the integrally molded base frame, the adjustment work of the optical system parts at the time of assembly is performed. Can be made simple and easy, workability can be improved, and deterioration of product performance can be suppressed. In addition, it is possible to prevent the deviation of the optical system parts from occurring due to vibration, drop, etc., and to suppress the deterioration of product performance.

[Brief description of drawings]

FIG. 1 is a front view showing a schematic configuration of a liquid crystal projector according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a front view showing a schematic configuration of a liquid crystal projector according to a conventional technique.

FIG. 4 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

 2,3 Separation dichroic mirror 4,11 Total reflection mirror 5,7,10 Liquid crystal panel 6,12 Synthetic dichroic mirror 13 Projection lens 21,22 Synthetic dichroic mirror mounting part 23 Projection lens mounting part 25 Base frame

Claims (1)

[Scope of utility model registration request] 1. A projection lens in which projection light from a light source is separated into color lights of three primary colors by a separation dichroic mirror, color lights of respective optical paths are respectively transmitted through a liquid crystal panel, and then combined again at least through a combining dichroic mirror. An optical system component mounting structure, wherein in a liquid crystal projector configured to project through, at least the synthesizing dichroic mirror and the projection lens are mounted on an integrally molded base frame.