JPH11202790A - Prism unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a prism unit which can avoid soiling of the luminous flux face of a dichroic prism, can easily exchange LCD and can reduce the number of parts. SOLUTION: The dichroic prism 1 synthesizing the luminous flux of colors, LCD 6 of respective colors, an LCD plate 5 having a luminous flux passing part making the luminous flux of respective colors pass through, a fixing means of LCD and a fixing/adjusting means fixing and adjusting LCD to the dichroic prism face position of LCD in the center, an adjusting plate 4 having LCD fixing projections 4a fixing the LCD plate 5, a luminous flux passing part making luminous flux pass through and through holes 5a for fixing, a lower holder 2 having a boss 2a for fixing the adjusting plate 4 on luminous flux faces for every color, an upper holder 3 having bosses 3a for fixing the adjusting plate 4 and a male screw of a nut for fixing the adjusting plate by screwing are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A light beam from a white light source is split by a dichroic mirror, light is modulated by a video signal by light valve control means for each color, and the light modulated colors are combined by a dichroic prism, and a screen is projected by a projection optical system. The present invention relates to a configuration of a prism unit used in an image projection device that projects an image on a prism.

[0002]

2. Description of the Related Art In a conventional LCD image projection apparatus, a light beam from a white light source such as a metal halide lamp is separated by a dichroic mirror having a spectral characteristic such as RGB, and each color is controlled by a light valve control means such as an LCD. The light is modulated by an image signal, and the light-modulated colors are combined by a dichroic prism, and an image is projected and output on a screen by a projection optical system. As shown in a perspective view and a partially exploded structure diagram in FIG. 6, the prism unit includes a dichroic prism 1 for synthesizing a light flux of each color, an LCD 6 for each color for controlling a light valve by a video signal, and an LCD fixing for fixing the LCD. An adjusting plate 4 having a projection 4a and a light beam passing portion for passing light beams of each color in the center portion and a through hole 4b for fixing; a light beam passing portion and adjusting plate 4 for passing light beams of each color in the center portion;
Mounting plate 10 having a female screw hole for screwing
The dichroic prism 1 includes an adhesive surface to be adhered to a lower portion of the dichroic prism 1 and a lower holder 2 having a prism unit attached to an LCD video projector housing. The mounting plate 10 to which the above-described adjustment plate 4 is screwed is directly adhered and fixed to the periphery of the light flux surface (incident surface) of each color of the dichroic prism 1. Each color light r, g, b separated by a dichroic mirror (not shown) is light-modulated by the LCD 6, and a combined output r + is obtained by a dichroic prism 1 in which four prisms having different spectral reflection characteristics are bonded.
g + b. In these methods, the mounting plate 10
Is directly adhered and fixed to the periphery of the light beam surface of the dichroic prism 1, so that the adhesive protrudes into the light beam surface, which is a factor of causing light beam loss and dirt. Also, LC
Since D6 is directly fixed and cured on the adjustment plate 4 with an ultraviolet curable adhesive, when the fixing of the LCD 6 needs to be readjusted in a manufacturing process or the like, there is a problem that it is difficult to reuse the LCD6.

[0003]

In view of the above problems,
SUMMARY OF THE INVENTION It is an object of the present invention to provide a prism unit which makes it possible to avoid dirt on a light beam surface of a dichroic prism and easily replace an LCD, and at the same time, to reduce the number of parts.

[0004]

A luminous flux from a white light source such as a metal halide lamp is separated by a dichroic mirror having a spectral characteristic such as RGB, and the light is modulated by a video signal by a light valve control unit such as an LCD for each color. Then, in a video projection device that combines the light-modulated colors with a dichroic prism and projects an image on a screen with a projection optical system, a dichroic prism that combines the luminous flux of each color, and an LCD of each color that performs light valve control with a video signal A light beam passing portion for passing light beams of each color to the center portion, an LCD fixing means, and LC
It has an LCD plate having an adjusting and fixing means for adjusting and fixing to the dichroic prism surface position of D, an LCD fixing protrusion for fixing the LCD plate, a light beam passing portion for passing light beams of each color in a central portion, and a fixing through hole. An adjustment plate, a lower holder having a boss for fixing the adjustment plate to a light flux surface for each color, and a bonding surface bonded to a lower portion of the dichroic prism; a bonding surface bonded to an upper portion of the dichroic prism; and a light flux surface for each color. An upper holder having a boss for fixing the adjustment plate to
The adjustment plate includes a lower holder and a male screw or nut for screwing the adjustment plate to the lower holder.

Further, the fixing means of the LCD is a screwing means or an adhesive means such as an adhesive or a double-sided adhesive sheet.

Further, an LCD adjusting hole for bonding the LCD plate to the adjusting plate is formed by projecting a through hole in a metal plate, or formed in a boss fixed on the metal plate by caulking or press fitting. Hole.

Further, a projection formed on a metal plate or a resin plate, wherein an LCD adjustment hole for bonding the LCD plate to the adjustment plate is a through hole formed in a boss fixed on the metal plate by caulking or press-fitting. Or a boss shaft fixed on a metal plate or a resin plate by caulking or the like.

Further, the lower holder and the upper holder are
Formed by resin molding means such as PC, formed by resin molding means such as UP, formed by resin molding means such as ABS containing glass fiber, formed by thermoplastic resin molding means such as phenolic resin, metal such as aluminum It is formed by die casting means or by metal die casting means such as zinc.

Further, the bosses of the lower holder and the upper holder are formed with fixing means such as press-fitting, caulking, or screwing the metal boss with a female screw or a male screw into the holder. It is formed by integral molding or by integral die casting at the time of metal die casting of the holder.

Furthermore, the lower holder and the upper holder are
It has an adhesive surface for adhering to the dichroic prism and a fixing surface for screwing the adjusting plate on a light flux surface for each color, and is formed by pressing a metal plate, or is adhered to the dichroic prism. A metal plate is formed by press working, having a bonding surface and a boss for screwing the adjustment plate to a light flux surface for each color.

Further, a dichroic prism for synthesizing light beams of respective colors, an LCD of each color for controlling a light valve by a video signal, a light beam passing portion for passing the light beams of each color to a central portion, a fixing means for the LCD, and an LCD. LCD having adjustment and fixing means for adjusting and fixing to a dichroic prism surface position
A resin, a lower holder having a plate, an adhesive surface adhered to the lower part of the dichroic prism, and an LCD fixing boss for fixing the LCD plate, and an LCD fixing member fixing the adhesive surface adhered to the upper part of the dichroic prism and the LCD plate The LCD is fixed to an LCD plate, the lower holder and the upper holder are bonded to a dichroic prism, and the LCD plate on which the LCD is screwed is adjusted with an adjusting jig or the like. After the position is adjusted, the LCD is fixed to the LCD fixing boss with an adhesive such as an ultraviolet curing adhesive. Further, the LCD fixing bosses of the lower holder and the upper holder are integrally formed at the time of resin molding, or are formed by metal die casting means such as aluminum or zinc, and the LCD fixing boss is integrally formed at the time of die casting. Further, the lower holder and the upper holder are formed by pressing a metal plate, and a projection is formed on the metal plate in place of the LCD fixing boss.

Further, a dichroic prism for synthesizing a light beam of each color, and an L for each color for controlling a light valve by a video signal.
An LCD plate having a CD, a light beam passage portion through which a light beam of each color passes through the center portion, an LCD fixing device, and an adjusting and fixing device for adjusting and fixing the LCD at a dichroic prism surface position; and an LCD fixing protrusion for fixing the LCD plate. An integrated adjustment plate in which the adjustment plate for all colors, which has a light beam passage portion through which light beams of each color pass at the center and a through hole for fixing, is integrally processed with a metal plate, and an adhesive surface that adheres to the lower part of the dichroic prism. A resin-molded lower holder having a screw portion for screwing the adjustment plate.

Further, a dichroic prism for synthesizing the light flux of each color, and an L for each color for controlling the light valve by a video signal.
An integrated adjustment plate obtained by integrally processing an adjustment plate for all colors having a CD, an LCD fixing protrusion for fixing the LCD, a light beam passage portion for passing light beams of each color at the center, and a fixing through hole, with a metal plate; The dichroic prism comprises a resin-molded lower holder having a bonding surface bonded to a lower portion of the dichroic prism and a screw portion for screwing the integrated adjustment plate.

Further, the manufacturing means for each of the adjustment plate, the lower holder, and the upper holder is formed by combining a plurality of means.

[0015]

FIG. 1 is an assembled structural view including a partially exploded view of a first embodiment of a prism unit according to the present invention;
FIG. 2 is an assembled structural view including a partially exploded view of a second embodiment of the prism unit according to the present invention. LCD for each color
6 is screwed to the LCD plate 5 with a screw 8,
Even the bonding means not shown has the same effect.
The LCD plate 5 has an opening for passing the light beam modulated by the LCD at the center, and an assembly adjustment jig or an adjustment device. After adjusting the mounting position and posture of the LCD plate 5, an ultraviolet curing adhesive is used. It has a through hole 5a for curing and fixing with an agent. The assembling adjustment includes the focus position of the LCD 8 for each of the RGB colors (the optical axis direction and the inclination in the optical axis direction), the registration adjustment for each color (the vertical / horizontal position in the direction perpendicular to the optical axis and the inclination in the vertical plane). ). A lower holder 2 is provided below a dichroic prism 1 in which four prisms having different spectral reflection characteristics are attached.
An upper holder 3 is adhesively fixed to the upper part. The lower holder 2 and the upper holder 3 each have a metal boss 2a having a screw hole for screwing the adjustment plate 4 for each color of RGB,
3a is caulked. The adjustment plate 4 is a metal plate having an LCD fixing protrusion 4 a for adjusting and fixing the LCD plate 5, an opening for passing a light beam in the center, and three through holes. The bosses 2a, 3a of the lower holder 2 and the upper holder 3 are screwed. In this figure, the LCD fixing projection 4a is formed by partially punching and bending a metal plate or a resin plate by pressing, but a boss shaft may be fixed on the plate by caulking or the like.

The lower holder 2 and the upper holder 3 of the first embodiment are manufactured by resin molding means such as PC, UP, ABS containing glass fiber, or phenol resin, or metal die casting means such as aluminum or zinc. You. The boss 3a is not limited to the caulking of a metal boss, and it is possible to select an integral molding of a resin or an integral molding of a metal die casting. The lower plate 21 and the upper plate 31 of the second embodiment have fixing portions 21a and 31a having screw holes.
In addition, it is formed by press working means of a metal plate.

FIG. 3 is an assembled structural view including a partial exploded view of a third embodiment of the prism unit according to the present invention, and FIG. 4 is an assembled structural view including a partially exploded view of a fourth embodiment of the prism unit according to the present invention. It is. In the third embodiment, the first
In addition, the configuration is such that the adjustment plate 4 and the screw 7 of the second embodiment are omitted. The lower holder 2 and the upper holder 3 are provided with LCD fixing projections 2b and 3b, and serve as projections on the adjustment plate. In the fourth embodiment, the adjustment plate 4 and the screw 7 of the second embodiment are reduced, and the lower plate 22 and the upper plate 32 which are directly adhered to the dichroic prism and have the LCD fixing projections 22a and 32a are made of metal. The plate is formed by pressing means. Reference numeral 22b denotes an attachment part for attaching the prism unit to the apparatus housing.

FIG. 5 shows a dichroic prism 1 according to the first embodiment, in which the adjustment plate for each of the three colors RGB is an integrated adjustment plate 33 formed by integrally pressing a metal plate.
And is screwed to the lower holder 23 adhered to the lower part with screws 7. LCD fixing projections 33 on top and side
a. Further, a sixth embodiment (not shown) eliminates the LCD plate of the fifth embodiment, and
The number of components is reduced by directly adjusting and hardening the LCD fixing projection 33a in the mounting hole.

Further, in a seventh embodiment (not shown), the prism unit is constituted by an L which constitutes the first to fifth embodiments.
The configuration is such that a CD plate, an adjustment plate, a lower holder, an upper holder, a lower plate, an upper plate, and the like are arbitrarily combined.

[0020]

The present invention is embodied in the form described above, and has the following effects. The LCD is fixed to the LCD plate, the lower holder and the upper holder are bonded to the dichroic prism, the adjustment plate is screwed to the bosses of the lower holder and the upper holder, and the LCD plate on which the LCD is screwed is positioned by an adjustment jig or the like. After being adjusted,
By using a structure that is fixed to the fixing and adjusting means with an adhesive such as an ultraviolet-curing adhesive, it is possible to eliminate the protrusion of the adhesive on the luminous flux surface of the dichroic prism, easily replace the LCD, and reduce the number of parts. I can plan.

[Brief description of the drawings]

FIG. 1 is an assembled structural view including a partially exploded view of a first embodiment of a prism unit according to the present invention.

FIG. 2 is an assembled structural view including a partially exploded view of a second embodiment of the prism unit according to the present invention.

FIG. 3 is an assembled structural view including a partially exploded view of a third embodiment of the prism unit according to the present invention;

FIG. 4 is an assembled structural view including a partially exploded view of a fourth embodiment of the prism unit according to the present invention;

FIG. 5 is an assembled structural view including a partially exploded view of a fifth embodiment of the prism unit according to the present invention;

FIG. 6 is an assembled structural view including a partial exploded view of a conventional prism unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dichroic prism 2, 23 Lower holder 2a, 3a Boss 2b, 3b Boss axis 3 Upper holder 4 Adjustment plate 4a, 22a, 33a LCD fixing protrusion 5 LCD plate 5a Through hole 6 LCD 7, 8 Screw 9 Adhesive 21 Lower part Plate 31 Upper plate 31a Fixed part

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04N 5/74 H04N 9/31 B 9/31 G02B 7/18 A

Claims (25)

[Claims] 1. A light beam from a white light source such as a metal halide lamp is separated by a dichroic mirror having spectral characteristics such as R (red), G (green), and B (blue), and an LCD is provided for each color.
(A liquid crystal display panel) or the like, a light valve control unit or the like modulates light with a video signal, synthesizes each of the light-modulated colors with a dichroic prism, and projects a video on a screen with a projection optical system. A dichroic prism for synthesizing, an LCD of each color for controlling a light valve by a video signal;
An LCD plate having fixing means for adjusting and fixing the LCD panel at the dichroic prism surface position, an LCD fixing protrusion for fixing the LCD plate, and a light beam passing portion for passing light beams of each color to a central portion; An adjustment plate having a fixing through-hole, a lower holder having an adhesive surface bonded to a lower portion of the dichroic prism and a boss for fixing the adjustment plate to a light flux surface for each color; and an upper portion of the dichroic prism An upper holder having a boss for fixing the adjustment plate to an adhesive surface to be adhered to the light flux surface for each color, and fixing means for fixing the adjustment plate to the lower holder and the lower holder, An LCD is fixed to the LCD plate, and the lower holder and the upper holder are the dichroic. The rhythm is fixed, the adjustment plate is fixed to the bosses of the lower holder and the upper holder, and the LCD plate to which the LCD is detachably fixed is adjusted with an adjustment jig or the like, and then the ultraviolet curing adhesive or the like is used. A prism unit fixed to the LCD fixing protrusion with an adhesive. 2. The prism unit according to claim 1, wherein said fixing means of said LCD is screw means. 3. The prism unit according to claim 1, wherein said fixing means of said LCD is an adhesive means such as an adhesive or a double-sided adhesive sheet. 4. The prism unit according to claim 1, wherein an LCD adjustment hole for bonding the LCD plate to the adjustment plate is formed by projecting a through hole in a metal plate. 5. An LCD adjusting hole for bonding the LCD plate to the adjusting plate is a through hole formed in a boss fixed on a metal plate by caulking or press-fitting. Prism unit. 6. The LCD fixing projection according to claim 1, wherein the projection is formed on a metal plate or a resin plate.
The described prism unit. 7. The prism unit according to claim 1, wherein the LCD fixing projection is a boss shaft fixed on a metal plate or a resin plate by caulking or the like. 8. The method according to claim 1, wherein the lower holder and the upper holder are connected to a PC.
2. The prism unit according to claim 1, wherein said prism unit is formed by resin molding means such as (Polycarbonete). 9. The method according to claim 9, wherein the lower holder and the upper holder are
2. The prism unit according to claim 1, wherein the prism unit is formed by resin molding means such as (Unsaturated polyester). 10. The prism unit according to claim 1, wherein said lower holder and said upper holder are formed by resin molding means such as ABS containing glass fiber. 11. The prism unit according to claim 1, wherein said lower holder and said upper holder are formed by thermoplastic resin molding means such as phenol resin. 12. The prism unit according to claim 1, wherein said lower holder and said upper holder are formed by die-casting means such as aluminum. 13. The prism unit according to claim 1, wherein said lower holder and said upper holder are formed by metal die-casting means such as zinc. 14. The boss of the lower holder and the upper holder is formed by fixing a boss having a female screw or a male screw formed on a metal boss by press-fitting, caulking or screwing the holder. The prism unit according to claim 1. 15. The prism unit according to claim 1, wherein the bosses of the lower holder and the upper holder are formed by integral molding when molding the resin of the holder. 16. The prism unit according to claim 1, wherein the bosses of the lower holder and the upper holder are formed by die-casting integrally with the die-casting of the holder. 17. A metal plate is formed by pressing the lower holder and the upper holder, the metal plate having a bonding surface for bonding to the dichroic prism and a fixing surface for screwing the adjustment plate to a light flux surface for each color. The prism unit according to claim 1, wherein the prism unit is formed by: 18. A metal plate formed by press working, wherein the lower holder and the upper holder have a bonding surface for bonding to the dichroic prism and a boss for screwing the adjustment plate to a light flux surface for each color. The prism unit according to claim 1, wherein: 19. A light beam from a white light source such as a metal halide lamp is separated by a dichroic mirror having a spectral characteristic such as RGB, and light is modulated by a video signal by light valve control means such as an LCD for each color, and light modulation is performed. In a video projector that combines the respective colors with a dichroic prism and projects an image on a screen with a projection optical system, a dichroic prism that combines the luminous flux of each color, and an LCD of each color that performs light valve control with a video signal, An LCD plate having a light beam passing portion for passing light beams of each color at a central portion, fixing means for the LCD, and adjusting and fixing means for adjusting and fixing the surface of the dichroic prism of the LCD, and bonding to a lower portion of the dichroic prism. Resin-molded lower holder having a surface and an LCD fixing boss for fixing the LCD plate And a resin-molded upper holder having an adhesive surface for adhering to an upper part of the dichroic prism and an LCD fixing boss for fixing the LCD plate, wherein the LCD is fixed to the LCD plate and the lower holder The upper holder is bonded to the dichroic prism, and the LCD plate on which the LCD is screwed is adjusted in position with an adjusting jig or the like, and then fixed to the LCD fixing boss with an adhesive such as an ultraviolet curing adhesive. A prism unit. 20. LC of said lower holder and upper holder
20. The prism unit according to claim 19, wherein the D fixing boss is integrally formed during resin molding. 21. The lower holder and the upper holder are formed by metal die-casting means such as aluminum or zinc;
20. The prism unit according to claim 19, wherein the LCD fixing boss is formed integrally during die casting. 22. The method according to claim 1, wherein the lower holder and the upper holder are formed by pressing a metal plate, and a projection is formed on the metal plate in place of the LCD fixing boss.
9. The prism unit according to 9. 23. A light beam from a white light source such as a metal halide lamp is separated by a dichroic mirror having a spectral characteristic such as RGB, and light is modulated by a video signal by a light valve control means such as an LCD for each color, and light modulation is performed. In a video projector that combines the respective colors with a dichroic prism and projects an image on a screen with a projection optical system, a dichroic prism that combines the luminous flux of each color, and an LCD of each color that performs light valve control with a video signal, An LCD plate having a light beam passing portion for passing light beams of respective colors in a central portion, fixing means for fixing the LCD, and fixing adjusting means for fixing and adjusting the position of the dichroic prism surface of the LCD, and an LCD fixing protrusion for fixing the LCD plate And a central portion having a luminous flux passing portion through which the luminous flux of each color passes and the fixing through-hole. An integrated adjustment plate obtained by integrally processing an alignment plate with a metal plate, a resin-molded lower holder having a bonding surface for bonding to a lower portion of the dichroic prism and a screw portion for screwing the integrated adjustment plate. A prism unit. 24. A light beam from a white light source such as a metal halide lamp is separated by a dichroic mirror having a spectral characteristic such as RGB, and light is modulated by a video signal by light valve control means such as an LCD for each color, and light modulation is performed. In a video projector that combines the respective colors with a dichroic prism and projects an image on a screen with a projection optical system, a dichroic prism that combines the luminous flux of each color, and an LCD of each color that performs light valve control with a video signal, An integrated adjustment plate obtained by integrally processing an adjustment plate for all colors having an LCD fixing protrusion for fixing the LCD, a light beam passage portion for passing light beams of respective colors in a central portion, and the fixing through-hole with a metal plate, Resin-molded lower holder having an adhesive surface that adheres to the lower portion of the dichroic prism and a screwing portion that screws the integrated adjustment plate And a prism unit. 25. The prism unit according to claim 1, 19, 23, or 24, wherein the means for manufacturing each of the adjustment plate, the lower holder, and the upper holder is formed by combining a plurality of means.