JP2000029401A - Liquid crystal projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the number of component parts, to reduce the product weight and to obtain slimmer appearance by providing a bottom plate with a lower supporting means for optical parts, such as lenses and providing an optical unit case with an upper supporting means for the optical parts. SOLUTION: The front surface of the bottom plate 2 is provided with lower grooves 52 so as to fixedly support the respective bottom ends of a second reflection mirror 12, a first regulating lens 17, a second dichroic mirror 16, a first dichroic mirror 15, a first converging lens 35, a second converging lens 36 and a first reflection mirror 11. On the other hand, the rear surface of the optical unit case 10 is provided with upper grooves 52 so as to fixedly support the respective top ends of the second reflection mirror 12, the first regulating lens 17, the second dichroic mirror 16, the first dichroic mirror 15, the first converging lens 35, the second converging lens 36 and the first reflection mirror 11. The respective parts are fixed by screwing to nuts 53 included in the bottom plate 2 by means of machine screws 45 via the holes of the optical unit case 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical unit case for supporting optical components of a liquid crystal projection display device.

[0002]

2. Description of the Related Art Conventionally, an optical unit case for locking at least optical components such as a lens, a reflecting mirror, a dichroic mirror, and a dichroic prism of a liquid crystal projection display device has a lower optical device which is a lower support means for the optical components. A unit case and an upper optical unit case serving as an upper supporting means of the optical component, holding and holding the optical component, and locking a set of the optical component, the lower optical unit case, and the upper optical unit case to a bottom plate; Was covered with a cover.

[0003]

This has the following disadvantages.

(A) In the above configuration, the large plastic parts are composed of the lower unit case, the upper unit case, the bottom plate, and the cover, and there is a limit in further reducing the number of assembling steps.

[0005] (b) In the above-mentioned structure, a large plastic part and a four-layer structure are used, which limits the reduction of the product weight by further reducing the number of structural parts and the slimming of the design by reducing the height of the product. there were.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal projection display device capable of reducing the number of components of a large plastic part, reducing the weight of a product, and obtaining a slim appearance without deteriorating the appearance.

[0007]

A bottom plate is provided with a lower support for at least optical components such as a lens, a reflecting mirror, a dichroic mirror, and a dichroic prism, and an optical unit case is provided with an upper support for the optical components. , And the cover is locked.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a liquid crystal projection display device used in the present invention. Reference numeral 1 denotes a cover, 2 denotes a bottom plate, 3 denotes a front panel, 4 denotes a set of lenses, 5 denotes a handle, and 6 denotes a front. 5 shows a partial exhaust hole. In the figure, the exterior design parts of the liquid crystal projection display device are a cover 1, a bottom plate 2, and a front panel 3.
, The material of which is made of plastic parts, a schematic diagram of its internal plane is shown in FIG.

In FIG. 2, reference numeral 10 denotes an optical unit case provided with support means (details will be described later) on the upper part of the optical components provided, 11 denotes a first reflecting mirror, and 12 denotes a second reflecting mirror. , 13 is a third reflecting mirror, 14 is a fourth reflecting mirror, 15 is a first dichroic mirror, 16 is a second dichroic mirror, 17 is a first adjusting lens, 18
Denotes a second adjustment lens, 20 denotes a polarizing plate, 21 denotes a first liquid crystal panel, 22 denotes a second liquid crystal panel, 23 denotes a third liquid crystal panel, 25 denotes a condenser lens, 34 denotes a dichroic prism, and 35 denotes a first liquid crystal panel. A light collecting lens, 36 is a second light collecting lens, 40 is a lamp, 41 is an exhaust fan, 42 is a first intake fan, 43 is a second intake fan, and 45 is a mechanical screw.

In FIG. 1, a lamp 40 is arranged downward in the figure, and light emitted from the lamp 40 is filtered by a filter (not shown) for cutting off ultraviolet rays and the first light collecting lens 3.
5 and the second light-collecting lens 36, and the first reflecting mirror 11
, The light passes through the second condenser lens 36 and the first condenser lens 35 again, and only the red color is reflected by the first dichroic mirror 15 and the others are passed.

The red light is reflected by the fourth reflecting mirror 14, passes through the condenser lens 31 and the polarizing plate 20, and irradiates the first liquid crystal panel 21.

On the other hand, the blue light and the green light passed by the first dichroic mirror 15 pass through the second dichroic mirror 16 in blue, the green light is reflected and separated, and the green light passes through the condenser lens 31. The light passes through the polarizing plate 21 and irradiates the second liquid crystal panel 22, and the blue light passes through the first adjusting lens 17 and passes through the second reflecting mirror 12.
Then, the light passes through the second adjusting lens 18, is further bent by 90 degrees by the third reflecting mirror 13, passes through the condenser lens 31, and irradiates the third liquid crystal panel 23 through the polarizing plate 20.

The first liquid crystal panel 21, the second liquid crystal panel 22, and the third liquid crystal panel 23 have respective R, G, B
Of each panel 2
The transmitted lights 1, 22, and 23 are each subjected to luminance modulation by the video signal.

The red light, the green light and the blue light whose luminance has been modulated are combined by the dichroic prism 34, and are enlarged and projected by the lens set 4.

The above is the arrangement of the optical components inside the optical unit case 10 and the optical system path.

Next, a lens is provided on the bottom plate, which is a main part of the present invention.
Mechanical implementation means provided with a lower support means for optical components such as a reflecting mirror, a dichroic mirror and a dichroic prism, provided with an upper support means for the optical components in an optical unit case, and locked with the bottom plate and cover. Description will be made with reference to the drawings.

FIG. 3 is a sectional view taken along the line AA of FIG. 2, FIG. 4 is a sectional view taken along the line BB of FIG.
2 shows a cross-sectional view along the line CC in FIG. In each of the drawings, the same reference numerals are given to the same components as those in the previous drawings, other reference numerals 51 are upper grooves, 52 is lower grooves, 53 is a nut, 54
Is a window, 56 is a leg, 57 is an upper rib, 58 is a lower rib, 60 is a bearing, 61 is a lamp case, 65 is a boss, 6
Reference numeral 6 denotes a lamp fixing screw.

In FIG. 3, the second reflecting mirror 12, the first adjusting lens 17, the second dichroic mirror 16, the first dichroic mirror 15, the first light collecting lens 35, the second The cross section is provided with a lower groove 52 having a concave shape so as to fixedly support the lower ends of the light collecting lens 36 and the first reflecting mirror 11.

On the other hand, the second reflecting mirror 12, the first adjusting lens 17, the second dichroic mirror 16, and the first dichroic mirror 1 are provided on the back of the optical unit case 10.
5. The upper groove 51 is formed so that its cross section is concave downward so that the upper ends of the first light collecting lens 35, the second light collecting lens 36, and the first reflecting mirror 11 are fixedly supported. Have.

With the bottom plate 2 having the above-described structure and the optical unit case 10, the second reflecting mirror 12, the first adjusting lens,
(7) The second dichroic mirror 16, the first dichroic mirror 15, the first light collecting lens 35, the second light collecting lens 36, and the first reflecting mirror 11 are vertically sandwiched, and a nut 53 provided on the bottom plate 2 is provided. Is screwed with a mechanical screw 45 through a hole (not shown) of the optical unit case 10 to fix them.

In FIG. 4, the cross section is concave so that the condenser lens 32, the polarizing plate 20, the third liquid crystal panel 23, the dichroic prism 34, and the lens set 4 are fixedly supported on the upper surface of the bottom plate 2. A lower rib 58 is provided.

On the other hand, the condenser lens 31, the polarizing plate 20, the third liquid crystal panel 2
3. An upper rib 58 having a concave cross section is provided so as to fixedly support the upper end of each of the dichroic prism 34 and the lens set 4.

The bottom plate 2 and the optical unit case 10 sandwich the condenser lens 31, the polarizing plate 20, the third liquid crystal panel 23, the dichroic prism 34, and the lens set 4 between the upper and lower parts. Nut 5
3 is screw-engaged with a mechanical screw 45 (not shown) through a hole (not shown) of the optical unit case 10, and each is fixed.

In FIG. 5, a lower rib 58 having a concave cross section is provided on the upper surface of the bottom plate 2 so as to fixedly support the second light collecting lens 36 and the first light collecting lens 35. A lid 59 of a lamp case 61 accommodating the lamp 40 is provided, while the second light collecting lens 36 and the first light collecting lens 35 are fixedly supported on the back surface of the optical unit case 10. , A lower rib 58 having a concave cross section, and a boss 65 for fixing a lamp case 61 accommodating the lamp 40.

The bottom plate 2 having the above structure and the optical unit case 10 sandwich the second light collecting lens 36, the first light collecting lens 35, and the lamp case 61 accommodating the lamp 40 up and down, and are provided on the bottom plate 2. The nuts 53 are engaged with machine nuts 45 (not shown) through holes (not shown) of the optical unit case 10 to fix each of them. Figure 3,
4 and 5, the configuration in which the optical component is sandwiched and locked between the bottom plate 2 and the optical unit case 10 is made possible.

[0027]

As described above, according to the present invention, it is possible to obtain a liquid crystal projection display device capable of reducing the number of components of large plastic parts, reducing the weight of the product, and obtaining a slim appearance without deteriorating the appearance. Has the effect.

[Brief description of the drawings]

FIG. 1 is a perspective view of a liquid crystal projection display device according to the present invention.

FIG. 2 is a plan view of a liquid crystal projection display device according to the present invention.

FIG. 3 is a sectional view taken along the line AA of FIG. 2;

FIG. 4 is a sectional view taken along the line BB in FIG. 2;

FIG. 5 is a sectional view taken along the line CC in FIG. 2;

[Explanation of symbols]

1 ... Cover, 2 ... Bottom plate, 3 ... Front panel, 4 ... Lens set, 5 ... Handle,
6 ... front exhaust hole, 10 ... optical unit case,
11 ... first reflector, 12 ... second reflector,
13 ... third reflector, 14 ... fourth reflector,
15 First dichroic mirror, 16
... second dichroic mirror, 17 ... first adjustment lens, 18 ... second adjustment lens, 20 ... polarizing plate, 21 ... first liquid crystal panel, 22 ... second liquid crystal panel, 23 ... third liquid crystal Paine, 31
... condenser lens, 34 ... dichroic prism,
35: first light collecting lens, 36: second light collecting lens, 40: lamp, 41: exhaust fan,
42 ... first intake fan, 43 ... second intake fan, 45 ... mechanical screw, 51 ... upper groove,
52: lower groove, 53: nut, 5
4 ... window, 56 ... leg, 57 ... upper rib, 58 ... lower rib, 60 ... bearing,
61: lamp case, 65: boss, 66: lamp fixing screw.

Continuing from the front page (72) Inventor Mitsugu Nakao 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Video & Media Division (72) Inventor Yuichi Yamada 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. F-term (Reference) 2H088 EA12 HA13 HA21 HA24 2H089 TA12 TA15 TA16 UA05 5C058 AB06 EA11 EA12 EA13 EA26 5G435 AA17 AA18 BB12 DD04 EE02 EE07 GG02 GG03 GG04 GG08 LL15

Claims (1)

[Claims] In a projection type display device, at least a lower support means for optical components such as a lens, a reflecting mirror, a dichroic mirror and a dichroic prism is provided on a bottom plate, the optical components are supported, and an upper part of the optical components is mounted on an optical unit case. A liquid crystal projection display device comprising a support means, wherein the optical component is locked by locking the bottom plate and the optical unit case.