JP3360804B2 - Prism unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention A light beam from a white light source is dispersed by a dichroic mirror, and light-valve control means for each color optically modulates it with a video signal. The present invention relates to the configuration of a prism unit used in an image projection device that projects an image on a screen.

[0002]

2. Description of the Related Art In a conventional LCD image projection apparatus, a light flux from a white light source such as a metal haloid lamp is dispersed by a dichroic mirror having a spectral characteristic such as RGB, and a light valve control means such as LCD is used for each color. Optically modulated by a video signal, the light-modulated colors are combined by a dichroic prism, and a projection optical system projects and outputs a video on a screen. Prism unit, as a perspective view and a partially exploded structural view in FIG. 6, the Da <br/> ik Roi' Kupurizumu 1 to synthesize the light beams of the respective colors, and LCD6 of each color for optical valve controlled by a video signal, LCD Adjustment plate 4 having LCD fixing protrusion 4a for fixing light, a light flux passing portion for passing light flux of each color in the central portion, and through hole 4b for fixing, and a light flux passing portion and adjusting plate for passing light flux of each color in the central portion. Mounting plate 10 having female screw holes for screwing 4
And a lower holder 2 having an adhesive surface for adhering to the lower portion of the dichroic prism 1 and an attaching portion for attaching the prism unit to the LCD image projector housing. The mounting plate 10 in which the adjustment plate 4 is screwed is directly bonded and fixed to the peripheral portion of the light flux surface (incident surface) of each color of the dichroic prism 1. The respective color lights r, g, b dispersed by a dichroic mirror (not shown) are optically modulated by the LCD 6, and combined output r + g + b is produced by the dichroic prism 1 in which four prisms having different spectral reflection characteristics are bonded together. In these methods, the mounting plate 1
Since 0 is directly adhered and fixed to the peripheral portion of the light flux surface of the dichroic prism 1, the adhesive is a factor that causes the light flux to be lost and dirty due to the adhesive protruding to the light flux surface. Also, L
Since the CD 6 is directly fixed and hardened to the adjustment plate 4 with an ultraviolet curable adhesive, there is a problem that it is difficult to reuse the LCD 6 when readjustment of the fixing of the LCD 6 is required in the manufacturing process or the like.

[0003]

In view of the above problems,
SUMMARY OF THE INVENTION It is an object of the present invention to provide a prism unit capable of avoiding contamination of the light flux surface of a dichroic prism and easy replacement of an LCD, and at the same time reducing the number of parts.

[0004]

The light beam from the white color light source Means for Solving the Problems] R
Spectrally by a dichroic mirror having a spectral characteristic of G B, the light valve control unit for each color (liquid crystal display panel
(Hereinafter LCD) is optically modulated by a video signal, and the light-modulated colors are combined by a dichroic prism, and a projection optical system projects an image on a screen.
And Dyke Roi' Kupurizumu for combining light beams of the respective colors, adjusted to the respective colors of the LCD for optical valve control, the central portion to the dichroic prism surface position of each color of the light beam passing portion and the LCD of the fixing means for passing the light beam and the LCD by the video signal An LCD plate having adjusting and fixing means for fixing, an LCD fixing protrusion for fixing the LCD plate, an adjusting plate having a light flux passing portion for passing light flux of each color in the central portion, and a through hole for fixing, and a lower portion of the dichroic prism. A lower holder having a boss for fixing the adjusting plate to a light-bonding surface for each color and a light-beam surface for each color, and an adhesive surface for bonding to the upper part of the dichroic prism and a light-beam surface for each color to fix the adjusting plate Upper holder having a boss and a male screw for screwing the adjustment plate to the lower holder and the lower holder Properly it is composed of a nut.

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

Further, an LCD adjusting hole for adhering the LCD plate to the adjusting plate is formed by forming a through hole in a metal plate by a projecting process or by forming a boss fixed on the metal plate by crimping or press fitting. Let it be a hole.

Further, a projection formed on a metal plate or a resin plate, wherein the LCD adjustment hole for adhering the LCD plate to the adjustment plate is a through hole formed in a boss fixed on the metal plate by crimping 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
PC (Polycarbonete) and UP (Unsaturated polyeste)
r), a resin molding means such as ABS containing glass fiber , a thermoplastic resin molding means such as phenol resin, or a metal die casting means such as aluminum or zinc.

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

Further, 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 the light flux surface for each color, and is formed by pressing a metal plate, or adheres to the dichroic prism. A metal plate is formed by pressing, which has a bonding surface and a boss for screwing the adjusting plate on the light flux surface of each color.

Further, the dichroic prism for synthesizing the light flux of each color, the LCD of each color for performing light valve control by the video signal, the light flux passing portion for passing the light flux of each color in the central portion, the fixing means of the LCD, and the LCD. LCD having adjustment fixing means for adjusting and fixing the dichroic prism surface position
A resin-molded lower holder having a plate, an adhesive surface for adhering to the lower part of the dichroic prism, and an LCD fixing boss for fixing the LCD plate, and an LCD fixing for fixing the adhesive surface and the LCD plate for adhering to the upper part of the dichroic prism. The LCD is fixed to the LCD plate, the lower holder and the upper holder are bonded to the dichroic prism, and the LCD plate on which the LCD is screwed is adjusted by an adjusting jig or the like. After the position is adjusted, the structure is fixed to the LCD fixing boss with an adhesive such as an ultraviolet curable adhesive. Further, the LCD fixing bosses of the lower holder and the upper holder are integrally molded at the time of resin molding, or are formed by metal die casting means such as aluminum or zinc so that the LCD fixing boss is integrally molded at the time of die casting. Further, the lower holder and the upper holder are formed by pressing a metal plate, and a protrusion is formed on the metal plate instead of the LCD fixing boss.

[0012] In addition, Dyke Roy to synthesize the light flux of each color
And Tsu Kupurizumu, the video signal and the color LCD for optical valve control, and an adjustment fixing means for adjusting fixed to each color dichroic prism surface position of the light beam passing portion and the LCD of the fixing means and the LCD for passing the light beam in the center An integrated adjustment in which an adjustment plate for all colors having an LCD plate having the LCD plate, an LCD fixing protrusion for fixing the LCD plate, a light beam passing portion for passing a light beam of each color in the central portion, and a through hole for fixing is integrally processed with a metal plate. It is composed of a plate, a resin-molded lower holder having an adhesive surface for adhering to the lower portion of the dichroic prism, and a screwing portion for screwing the integral adjusting plate.

[0013] In addition, Dyke Roy to synthesize the light flux of each color
And Tsu Kupurizumu, and each color LCD which performs light valve controlled by a video signal, the total color separation and a through hole for fixing the light beam passing portion for passing the light beams of the respective colors on the LCD fixing projection and a central portion for fixing the LCD The adjustment plate is made of a metal plate and is integrally processed. The integrated adjustment plate includes a 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.

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

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an assembly structure diagram including a partially exploded view of a first embodiment of a prism unit according to the present invention,
FIG. 2 is an assembly structure diagram 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 if it is an adhesive means not shown, it 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 adjusting jig or adjusting device to adjust the mounting position and posture of the LCD plate 5, and then the ultraviolet curing adhesive. It has a through hole 5a for hardening and fixing with an agent. The assembly adjustment is performed by adjusting the focus position (optical axis direction and inclination in the optical axis direction) of the LCD 6 for each RGB color, and the registration adjustment for each color (vertical / horizontal position in the vertical plane direction to the optical axis and within the same vertical plane. Inclination) and so on. A lower holder 2 is provided below the dichroic prism 1 in which four prisms having different spectral reflection characteristics are bonded together.
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 of RGB colors,
3a is crimped. The adjustment plate 4 is a metal plate having an LCD fixing protrusion 4a for adjusting and fixing the LCD plate 5, an opening for allowing a light beam to pass through in the central portion, and three through holes. It is screwed to the bosses 2 a, 3 a of the lower holder 2 and the upper holder 3. LCD fixing protrusion 4a is, in this diagram are formed by bending a portion punching by pressing a metal plate or a resin plate may be fixed by such caulking boss axis in the plate.

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. It The boss 3a is not limited to the caulking of the metal boss, but resin integral molding, metal die casting integral molding, or the like can be selected. The lower plate 21 and the upper plate 31 of the second embodiment have fixed portions 21a and 31a having screw hole portions.
Together with this, it is formed by means of pressing a metal plate.

FIG. 3 is an assembly structure diagram including a partially exploded view of a third embodiment of the prism unit according to the present invention, and FIG. 4 is an assembly structure diagram including a partially exploded view of the fourth embodiment of the prism unit according to the present invention. Is. In the third embodiment, the first
Further, the adjusting plate 4 and the screw 7 of the second embodiment are eliminated. LCD fixing protrusions 2b and 3b are provided on the lower holder 2 and the upper holder 3 to serve as protrusions on the adjustment plate. In the fourth embodiment, the adjusting plate 4 and the screw 7 of the second embodiment are eliminated, and the lower plate 22 and the upper plate 32, which are directly bonded to the dichroic prism and have the LCD fixing protrusions 22a and 32a, are made of metal. The plate is formed by pressing means. Reference numeral 22b is an attachment portion for attaching the prism unit to the apparatus housing.

In FIG. 5, the adjustment plate for each of the three RGB colors of the first embodiment is an integrated adjustment plate 33 formed by integrally pressing a metal plate, and the dichroic prism 1 is used.
The structure is such that the lower holder 23 bonded to the lower part of the is screwed with the screw 7. LCD fixing protrusion 33 on the top and side
a is formed. Further, in the sixth embodiment not shown, the LCD plate of the fifth embodiment is deleted, and the LCD is
The number of parts is reduced by directly adjusting and hardening the LCD fixing protrusion 33a in the mounting hole.

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

[0020]

The present invention is carried out 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 adjusting 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 adjusting jig or the like. After being adjusted
By adopting a structure that is fixed to the fixing adjustment means with an adhesive such as an ultraviolet curable adhesive, the adhesive does not stick out on the light flux surface of the dichroic prism and the LCD can be easily replaced, further reducing the number of parts. Can be planned.

[Brief description of drawings]

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

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

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

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

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

FIG. 6 is an assembly structural view including a partially exploded view of a prism unit according to the related art.

[Explanation of symbols]

1 Daikuroi Tsu Kupurizumu 2,23 lower holder 2a, 3a boss 2b, 3b boss shaft 3 upper holder 4 adjustment plate 4a, 22a, 33a LCD fixing projection 5 LCD plates 5a through holes 6 LCD 7, 8 screw 9 the adhesive 21 the lower plate 31 Upper plate 31a Fixed part

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI H04N 5/74 H04N 9/31 B 9/31 G02B 7/18 A

Claims (21)

(57) [Claims] 1. A light flux from the white color light source R (red) G (green) B
Spectrally by a dichroic mirror having spectral characteristics (blue), the light valve control unit for each color (liquid crystal display panel
(Hereinafter LCD) is optically modulated by a video signal, and the light-modulated colors are combined by a dichroic prism, and a projection optical system projects an image on a screen.
And Dyke Roi' Kupurizumu for combining light beams of the respective colors,
The LCD of each color for performing light valve control by a video signal, a light flux passing portion for passing a light flux of each color in the central portion, and the LC
LCD having D fixing means and adjusting and fixing means for adjusting and fixing to the dichroic prism surface position of the LCD
A plate, an LCD fixing protrusion for fixing the LCD plate, an adjusting plate having a central portion through which a light flux passing through for each color of light and a through hole for fixing, and an adhesive plate under the dichroic prism. A lower holder having an adhesive surface and a boss for fixing the adjusting plate to the light flux surface of each color, and an adhesive surface that adheres to the upper portion of the dichroic prism and the light flux surface of each color to fix the adjusting plate And a fixing means for fixing the adjusting plate to the lower holder and the lower holder, the LCD is fixed to the LCD plate, and the lower holder and the upper holder are the dichroic prism. is fixed to the adjusting plate is fixed to the boss of the lower holder and the upper holder,
After LCD plate the LCD is detachably fixed is that is position adjustment in such adjusting jig, a prism unit, characterized in that the structure for fixing the LCD fixing protrusion at contact adhesive. 2. The prism unit according to claim 1, wherein the fixing means of the LCD is a screwing means. 3. The prism unit according to claim 1, wherein the fixing means of the LCD is an adhesive means such as an adhesive or a double-sided adhesive sheet. 4. The prism unit according to claim 1, wherein the LCD adjusting hole for adhering the LCD plate to the adjusting plate is formed by projecting a through hole in a metal plate. 5. The LCD adjusting hole for adhering the LCD plate to the adjusting plate is a through hole formed in a boss fixed on a metal plate by crimping or press fitting. Prism unit. 6. The LCD fixing protrusion is a protrusion formed on a metal plate or a resin plate.
The prism unit described. 7. The LCD fixing protrusion is crimped to a metal plate.
Prism unit according to claim 1, characterized in that a more fixed boss axis Engineering. 8. the lower holder and the upper holder, the prism unit of claim 1, wherein the forming in tree fat shaping means. 9. The lower holder and the upper holder are formed by a thermoplastic resin molding means.
The prism unit described. 10. the lower holder and the upper holder, and forming a gold <br/> genus die casting means according to claim 1
The prism unit described. 11. The bosses of the lower holder and the upper holder are formed by fixing a boss having a female boss or a male screw formed on a metal boss to the holder by press fitting, caulking, or screwing. The prism unit according to claim 1. 12. The bosses of the lower holder and the upper holder, the prism unit of claim 1, wherein the forming by integral molding during resin molding of the holder. 13. The prism unit according to claim 1, wherein the bosses of the lower holder and the upper holder are formed by die-casting integral molding during metal die-casting of the holder. 14. A metal plate is press-worked, wherein each of the lower holder and the upper holder has an adhesive surface for adhering to the dichroic prism and a fixing surface for screwing the adjusting plate to a light flux surface for each color. The prism unit according to claim 1, wherein the prism unit is formed by the following method. 15. The lower holder and the upper holder each have an adhesive surface for adhering to the dichroic prism and a boss for screwing the adjusting plate to a light flux surface for each color, and a metal plate is formed by press working. The prism unit according to claim 1, wherein 16. A light flux from a white light source is R (red) and G (green).
Spectrally by a dichroic mirror having spectral characteristics B (blue), the light valve control unit for each color (liquid crystal display panel
(Hereinafter LCD) is optically modulated by a video signal, and the light-modulated colors are combined by a dichroic prism, and a projection optical system projects an image on a screen.
And Dyke Roi' Kupurizumu for combining light beams of the respective colors,
The LCD of each color for performing light valve control by a video signal, the light flux passing portion for passing the light flux of each color in the central portion, and the LCD
And LCD plate to the fixing means the dichroic prism surface position of the LCD and an adjustment fixing means for adjusting fixed, possess the LCD fixing boss for fixing the LCD plate with adhesive surface that adheres to the lower portion of the dichroic prism constituted by a lower holder, and the dichroic upper holder possess an LCD fixing boss upper adhesive surface that adheres to the click prism to fix the LCD plate,
The LCD is fixed to the LCD plate, and the lower holder and the upper holder are the dichroic prism.
Prism unit is bonded, wherein said LCD plate LCD is sealed screw after being position adjustment in such adjusting jig, to a structure for fixing the LCD fixing boss contact adhesive on. 17. The lower holder and the upper holder are made of resin.
17. The prism unit according to claim 16, wherein the prism unit is formed by a molding means, and the LCD fixing boss is integrally molded at the time of resin molding of the holder . 18. The lower holder and the upper holder are formed by metal die casting means, and the LCD fixing boss is formed on the holder.
17. The prism unit according to claim 16, wherein the prism unit is integrally molded when die casting the rudder . The method according to claim 19 wherein said lower holder and an upper holder formed by pressing a metal plate, wherein in place of the LCD fixed boss, the prism according to claim 16, wherein that you form a protrusion in the metal plate unit. 20. A light flux from a white light source is R (red) G (green)
Spectrally by a dichroic mirror having spectral characteristics B (blue), the light valve control unit for each color (liquid crystal display panel
(Hereinafter LCD) is optically modulated by a video signal, and the light-modulated colors are combined by a dichroic prism, and a projection optical system projects an image on a screen.
And Dyke Roi' Kupurizumu for combining light beams of the respective colors,
The LCD of each color for performing light valve control by a video signal, the light flux passing portion for passing the light flux of each color in the central portion, and the LCD
LCD plate having fixing means and fixing adjustment means for fixing and adjusting to the dichroic prism surface position of the LCD, LCD fixing protrusions for fixing the LCD plate, and a light flux passing portion for passing light flux of each color in the central portion, and An integrated adjustment plate integrally formed with a metal plate for adjustment plates for all colors having a through hole for fixing, an adhesive surface for adhering to the lower part of the dichroic prism, and a screwing portion for screwing the integrated adjustment plate. prism unit, characterized in that it consists of a lower holder for perforated. 21. A light flux from a white light source is R (red) G (green)
Spectrally by a dichroic mirror having spectral characteristics B (blue), the light valve control unit for each color (liquid crystal display panel
(Hereinafter LCD) is optically modulated by a video signal, and the light-modulated colors are combined by a dichroic prism, and a projection optical system projects an image on a screen.
And Dyke Roi' Kupurizumu for combining light beams of the respective colors,
Adjustment for all colors including the LCD of each color for performing light valve control by a video signal, an LCD fixing protrusion for fixing the LCD, a light beam passing portion for passing a light beam of each color in the central portion, and the fixing through hole integral adjustment plate which is integrally processed by the metal plate plate, characterized in that it consists of a lower holder for perforated and threaded portion for Nishitome the integral adjustment plate with adhesive surface that adheres to the lower portion of the dichroic prism Prism unit.