JP3322608B2 - Lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device for use in a projection device for projecting an image displayed on a liquid crystal panel or the like onto a screen.

[0002]

2. Description of the Related Art Conventionally, as a device for displaying a large screen image, a device such as a liquid crystal projector that illuminates an image displayed on a liquid crystal panel with strong light and projects the image on a screen is known. Projection devices are known. As a light source of this type of projection device, a 250 to 400 W lamp, which is relatively inexpensive to increase the input of the light source, is widely used. However, a lamp with a large input generally has a short service life, and the arc length cannot be shortened in relation to the service life. Therefore, the light collection efficiency is low, and the heat generation is large. There is a big problem. Regarding the light use efficiency, the use efficiency of a liquid crystal projector using a current mainstream 250 W lamp is only about 2.5% lumen / W (2.0 ANSI Lumens / W). Further, if the lamp is cut off during the projection, the projection must be interrupted to replace the lamp. The present invention clarifies an illumination device that can solve the above problem by using a plurality of lamps.

[0003]

According to the present invention, there is provided an irradiation apparatus comprising: a first light source (1) passing through a first cylindrical lens (3);
The second light source (1a) having passed through the second cylindrical lens (3a)
The two cylindrical lenses (3) and (3a) are arranged at a predetermined angle so that the lights intersect with each other, and the two lenses (3) and (3a) are positioned near the intersection of the light transmitted through the two cylindrical lenses (3) and (3a). The partial reflecting mirror (4) is disposed at an angle, and the partial reflecting mirror (4) is provided with a light transmitting portion (41) that allows light from one cylindrical lens to pass through and light from the other cylindrical lens. It has reflecting plates (42) that reflect alternately in parallel,
Light transmitted through both cylindrical lenses (3) and (3a) irradiates a common synthetic cylindrical lens (5).

[0004]

[Operation and Effect] The light of the first light source (1) and the second light source (1a)
The light transmitted through the first cylindrical lens (3) and the second cylindrical lens (3a), respectively, and the light transmitted through one of the cylindrical lenses passes through the light transmitting portion (41) of the partial reflecting mirror (4), and is synthesized into a synthetic cylindrical lens. The light that has reached (5) and has passed through the other cylindrical lens is reflected by the partial reflecting mirror (4).
The light is reflected at (42) and reaches the synthetic cylindrical lens (5). As described above, since a plurality of light sources (1) are provided, a lamp having a small input can be used as the light source. Generally, a lamp with a small input has a longer life than a lamp with a large input, so that the frequency of replacement for one lamp is reduced.
Further, by using a plurality of lamps, even if one lamp is cut off, the projection can be continued although the image is slightly darkened,
The inconvenience of interrupting the projection is eliminated. Furthermore, a lamp with a small input can shorten the arc length, thereby improving the light collection efficiency. A lamp with a small input also generates a small amount of heat, so that the cooling fan can be small and the operating noise can be reduced. Can be lowered.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
The first and second two light sources (1) and (1a) provided with a) are located such that their optical axes are orthogonal to each other. The light source of the embodiment is a metal halide lamp. A first cylindrical lens (3) and a second cylindrical lens (3a) are located on the irradiation side of the first light source (1) and the second light source (1a), respectively, orthogonal to each optical axis. As is well known, a cylindrical lens is formed by arranging convex lenses on a cylindrical surface in parallel.
Each of the cylindrical lens (3) and the second cylindrical lens (3a) has five convex lenses (31) and (31a). The synthetic cylindrical lens (5) is opposed to the first cylindrical lens (3) and the first cylindrical lens (3).
Deployed in parallel to Synthetic cylindrical lens
(5) has ten cylindrical convex stripe lenses (51),
This corresponds to the number of the first cylindrical lens (3) and the second cylindrical lens (3a) plus the convex lens (31) (31a).

The distance between the first cylindrical lens (3) and the synthetic cylindrical lens (5) is determined by the focal length f1 of the first cylindrical lens (3) and the synthetic cylindrical lens.
It is equal to the length obtained by adding the focal length f2 of (5). Each of the first cylindrical lens (3), the second cylindrical lens (3a) and the synthetic cylindrical lens (5) is a convex lens (31).
(31a) The synthetic cylindrical lens (5) is arranged so that the convex stripe directions of (51) are parallel to each other, and the light from each convex stripe lens (31) of the first cylindrical lens (3) is With respect to the convex lens group of the lens (5), it is located at a position corresponding to every other convex lens (51).

The first and second cylindrical lenses (3) and (3a) and the synthetic cylindrical lens (5) are provided between the first cylindrical lens (3) and the synthetic cylindrical lens (5).
A partial reflector (4) is arranged at an angle of 45 ° to the mirror. The partial reflecting mirror (4) is a first cylindrical lens
Four cylindrical light-transmitting portions (41) that pass the light of the first light source (1) transmitted through (3) and light of the second light source (1a) transmitted through the second cylindrical lens (3a) are combined into a synthetic cylindrical lens.
(5) Five strip-shaped reflecting portions (42) for reflecting light to the side are alternately provided, and the longitudinal direction of the light transmitting portion (41) and the reflecting portion (42) is aligned with each of the cylindrical lenses (3), (3a), (5). ) Convex lens (31) (31a) (51)
Is parallel to the ridge direction.

In FIG. 1, a partial reflecting mirror (4) has a structure in which light transmitted through the uppermost convex lens (31) of the first cylindrical lens (3) passes outside the partial reflecting mirror (4). So that the light transmitted through the four convex lenses passes through the four light-transmitting portions (41) of the partial reflecting mirror (4), and each reflecting portion (42) corresponds to one of the second cylindrical lenses (3a). One convex lens (3
It is positioned to reflect the light from 1a). The width of each reflecting part (42) of the partial reflecting mirror (4) is the corresponding convex lens.
(31a), that is, depending on the convergence and diffusion of light transmitted through the convex lens (31a), the corresponding convex lens (31
It is determined that all the light from a) falls on the portion of the synthetic cylindrical lens (5) that was not irradiated with the light from the first light source (1).

However, the light from the first light source (1) passes through the first cylindrical lens (3), passes through the light transmitting portion (41) of the partial reflecting mirror (4), and passes through the synthetic cylindrical lens (5). )
Illuminate every other convex lens (51). The light from the second light source (1a) passes through the second cylindrical lens (3a), is reflected by the reflecting portion (42) of the partial reflecting mirror (4), and is reflected by the first light source (5) of the synthetic cylindrical lens (5). The part where the light of 1) was not irradiated is illuminated. The light from the first light source (1) and the light from the second light source (1a) are combined and emitted from the synthetic cylindrical lens (5).

As described above, in order to use a plurality of light sources (1),
A low input lamp can be used as the light source. Generally, a lamp with a small input has a longer life than a lamp with a large input, so that the frequency of replacement for one lamp is reduced. Further, a lamp with a small input can shorten the arc length, thereby improving the light collection efficiency.
Recently, a liquid crystal projection device that combines a 100W short arc lamp and a polarization conversion element plate has been commercialized, with a high efficiency of 6.5% lumens / W (6.5ANSl Lumens / W) and a long lamp life of more than 4000 hours. Has been realized. This 1
By adopting a combination of a 00W short arc lamp and a polarization conversion element plate, 1300 ANSI (6.5% lumen /
W, 6.5ANSI Lumens / W) can be realized. Also, a lamp with a small input generates a small amount of heat,
The cooling fan can be small, and the operating noise can be reduced.
Further, since a plurality of lamps are used, even if one lamp is cut off, the projection can be continued although the image is slightly darkened, and the inconvenience of projection interruption is eliminated.

FIG. 3 shows a partial reflecting mirror (4) formed of a transparent glass plate. The light transmitting part (41) is not processed, and the reflecting part (42) has a reflective layer formed by vapor deposition of Al or the like. Has formed.

FIG. 4 shows two light sources (1) and (1)
(1) This is an embodiment in which (1) is connected to a lamp control section (300) that can switch on or simultaneously arbitrarily and light only one lamp. AC power outlet (301), main power circuit (302)
When N, the lamp control circuit (303) and the timer (304) are energized. The lamp selection switch (305) includes a normal switch and an economy switch. When the normal switch is turned on, the lamp control circuit is driven and the relay (306) (30
7) operates and energizes the lamp ballasts (308) and (309)
The two light sources (1) and (1) are turned on. Lamp selection switch (30
When the economy switch of 5) is turned ON, the lamp control circuit
(303) is driven, the relay (306) or (307) on the light source side with a small lighting time, the lighting time of which has been integrated for each light source by the timer (304) of each light source, operates, and the lamp ballast (308) or
(309) is energized to light the light source (1) with the shorter lighting integration time.

FIG. 5 shows an irradiation apparatus for a horizontally long liquid crystal plate (6), in which the convex line direction of the convex line lens (51) of the synthetic cylindrical lens (5) extends along the longitudinal direction of the liquid crystal plate (6). This is an example. 1st cylindrical lens (3), 2nd
The projecting direction of the convex lenses (31) and (31a) of the cylindrical lens (3a) is, of course, coincident with the projecting direction of the convex lens (51) of the synthetic cylindrical lens (5). The case of FIG. 5 is effective when a polarizing plate (not shown) is provided on the exit side of the synthetic cylindrical lens (5) to irradiate the liquid crystal plate (6).

FIG. 6 shows an example of illuminating the liquid crystal panel (6) by combining the same illuminating device and integrator illuminating unit as in FIG. A first and a second lens array (8) are provided on the exit side of the synthetic cylindrical lens (5) of the illumination device similar to FIG.
1) A known integrator illumination unit (8) constituted by (82) and a condenser lens (83) is provided. The two lens array bodies (81) and (82) are formed of transparent glass or transparent resin, and, for example, as shown in FIG.
A total of 100 convex lenses (81a) and (82a) are arranged in a plane parallel to the flat surface of the synthetic cylindrical lens (5).

The two lens array bodies (81) and (82) are provided so that light incident on the convex lens (81a) of the first lens array body (81) from the synthetic cylindrical lens (5) is transmitted to the second lens array body (82).
Are set to converge by the convex lens (82a). Outgoing light from each convex lens (81a) of the first lens array body (81) is incident only on the facing convex lens (82a) of the convex lens group of the second lens array body (82), Each of the convex lenses (82a) of the lens array body (82) irradiates a common area on the liquid crystal plate (6). In the embodiment of FIG. 6, as shown in FIG. 8, the first lens array body (81) of the integrator lighting unit (8) and the synthetic cylindrical lens (5) can be integrally formed.

FIG. 9 shows four total reflection mirrors (63), (64) and (65).
This is an example in which illumination is applied to a liquid crystal projector incorporating (66) and two dichroic mirrors (903) and (904). A screen (not shown) is provided in front of the apparatus main body (900), and a projection lens (902) including a lens group is provided at a front end of the apparatus main body (900) so as to face the screen. . At the rear end of the device main body (900), a lighting device similar to that of FIG. 6 is provided. From the light source (1) (1a) to the projection lens (90
On the optical path up to 2), there are two dichroic mirrors (903) and (904), R, G, and B, which are inclined at 45 ° to the optical path.
Three liquid crystal panels (60), (61), (62) and four total reflection mirrors (63), (64), (65), (66) corresponding to the three primary colors are arranged in a known manner.

Only the red light passes through the dichroic mirror (903), and the passed light is reflected by the total reflection mirror (64).
The liquid crystal panel for red light (60) is irradiated. On the other hand, the light beam reflected by the dichroic mirror (903) reflects green light by the dichroic mirror (904), and the reflected light illuminates the liquid crystal panel (61) for green light. The light beam that has passed through the dichroic mirror (904) is
5) After being reflected by (66), the liquid crystal panel for blue light (6
Irradiate 2). The luminous flux that has passed through the liquid crystal panels (60), (61), and (62) for red light, green light, and blue light
01), an image corresponding to each of red, blue and green lights is synthesized by the color synthesizing prism (901), and is projected on a screen (not shown) by the projection lens (902).

FIG. 10 shows an embodiment in which the light of the second light source (1a) in FIG. 9 is reflected by the total reflection mirror (11) and then transmitted through the second cylindrical lens (3a).

FIG. 11 shows three light sources (1) in FIG.
This is an example using (1a) and (1b). 1 comprising a first light source (1), a second light source (1a), a first cylindrical lens (3), a second cylindrical lens (3a), a partial reflecting mirror (4), and a synthetic cylindrical lens (5). For lighting equipment (200),
It is provided with a third light source (1), a second partial reflecting mirror (4a), and a second synthetic cylindrical lens (5a). Lighting equipment (20
A third cylindrical lens (3b) is provided on the exit side of the synthetic cylindrical lens (5) of (0), and the fourth cylindrical lens (3c) is orthogonal to the third cylindrical lens (3b).
Is deployed. A third light source (1b) is provided on the incident side of the fourth cylindrical lens (3c).

Between the third cylindrical lens (3b) and the fourth cylindrical lens (3c), the light of the first light source (1) and the second light source (1a) transmitted through the third cylindrical lens (3b) is reflected. A second partial reflector (4a) for passing the light of the third light source (1b) transmitted through the fourth cylindrical lens (3c) is disposed in parallel with the partial reflector (4) of the illumination device (200). . The fourth cylindrical lens (3) is sandwiched by the second partial reflecting mirror (4a).
A second synthetic cylindrical lens (5a) is provided in parallel with c). Light from the illumination device (200) and the third light source (1b) passes through the second synthetic cylindrical lens (5a) and the integrator illumination unit (8) and follows the above-described optical path.

FIG. 12 is a view similar to FIG.
(1) The lighting device of (1a) (1b) and the three light sources (1) (1a) (1b) of FIG.
Are combined and illuminated, and the description is omitted with reference to the drawings.

FIG. 13 shows four dichroic mirrors (9
03) (904) (905) (906) and three total reflection mirrors (63) (64) (65)
Is a projection device incorporating the. A screen (not shown) is provided in front of the device body (900), and the device body (900)
A projection lens (902) composed of a lens group is provided at the front end of the lens so as to face the screen. An illumination device similar to that of FIG. 6 is provided below the device main body (900). On the optical path from the light source (1) (1a) to the projection lens (902), four dichroic mirrors (903) (904) (905) (906) inclined at 45 ° to the optical path and R , G, and B, and three display panels (60), (61), (62) corresponding to the three primary colors, and three total reflection mirrors (63), (64), (65) are provided in a known manner.

Only the red light passes through the dichroic mirror (903) and the display panel (6) for the red light passes through the total reflection mirror (64).
0) is irradiated. On the other hand, the light beam reflected by the dichroic mirror (903) has green light reflected by the dichroic mirror (904), and the reflected light is a display panel (61) for green light.
Is irradiated. The light beam passing through the dichroic mirror (904) irradiates the display panel (62) for blue light,
The light is reflected by the total reflection mirror (65) and reaches the dichroic mirror (906). Display panel for red light and green light
The luminous flux passing through (60) and (61) is converted to a dichroic mirror (90
The light is synthesized by 5) and enters the dichroic mirror (906). Images corresponding to red, blue, and green lights are synthesized by a dichroic mirror (906), and are projected onto a screen by a projection lens (902).

The description of the above embodiments is for the purpose of illustrating the present invention and should not be construed as limiting the invention described in the appended claims or reducing the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a basic arrangement of a light source 1, a first cylindrical lens, a partial reflecting mirror, and a synthetic cylindrical lens.

FIG. 2 is a perspective view showing an arrangement of a first cylindrical lens, a second cylindrical lens, a partial reflecting mirror, and a synthetic cylindrical lens.

FIG. 3 is a front view of a partial reflecting mirror.

FIG. 4 is a block diagram of a light source switching control circuit.

FIG. 5 is a perspective view showing a state where the direction of a synthetic cylindrical lens is aligned with a liquid crystal plate.

FIG. 6 is an explanatory diagram of a lighting device provided with an integrator lighting unit.

FIG. 7 is a perspective view of first and second lens arrays.

FIG. 8 is a perspective view of a synthetic cylindrical lens and a first lens array formed integrally.

FIG. 9 is an explanatory diagram of the first embodiment of the liquid crystal projector.

FIG. 10 is an explanatory diagram of a second embodiment of the liquid crystal projector.

FIG. 11 is an explanatory diagram of a third embodiment of the liquid crystal projector.

FIG. 12 is an explanatory diagram of a fourth embodiment of the liquid crystal projector.

FIG. 13 is an explanatory diagram of a fifth embodiment of the liquid crystal projector.

[Explanation of symbols]

 (1) First light source (1a) Second light source (3) First cylindrical lens (3a) Second cylindrical lens (4) Partial reflector (5) Synthetic cylindrical lens (8) Integrator lighting unit

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI G02F 1/13357 G02F 1/1335 530 (56) References JP-A-9-258160 (JP, A) JP-A-9-179120 ( JP, A) JP-A-9-50082 (JP, A) JP-A-7-244282 (JP, A) JP-A-5-72628 (JP, A) JP-A-4-298730 (JP, A) Hei 3-10219 (JP, A) WO 98/23993 (WO, A1) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02B 27/18 G02B 27/00 G02F 1/13 G03B 21 / 14

Claims (4)

(57) [Claims] 1. A light source of a first light source (1) passing through a first cylindrical lens (3) comprising a plurality of convex lenses, and a plurality of light beams.
The two cylindrical lenses (3) and (3a) are arranged at a predetermined angle so that the light of the second light source (1a) passing through the second cylindrical lens (3a) composed of the convex stripe lens intersects with each other. A partial reflecting mirror (4) at an angle to both lenses near the intersection of the light transmitted through the two cylindrical lenses (3) and (3a)
The partial reflecting mirror (4) comprises a light transmitting portion (41) that allows light from one cylindrical lens to pass through and a reflecting portion (42) that reflects light from the other cylindrical lens alternately and in parallel. Light from the first light source (1)
Added the number of convex stripe lenses for the cylindrical lenses (3) and (3a)
Synthetic cylindrical lens consisting of a number of convex lenses (5)
Irradiate every other convex lens (51), and check whether the second light source (1a)
These lights are reflected on the remaining convex stripes of the synthetic cylindrical lens (5).
An illumination device for irradiating a lens . 2. An illuminating device for a rectangular liquid crystal plate, comprising: a convex lens (3) of first and second cylindrical lenses (3) and (3a).
1) The lighting device according to claim 1, wherein the ridge direction of (31a) coincides with the longitudinal direction of the liquid crystal plate. 3. The illuminating device according to claim 1, wherein the partial reflecting mirror (4) forms a reflecting portion (42) by forming a reflecting film on a parallel strip on a glass plate. 4. An integrator illumination unit (6) on the exit side of the synthetic cylindrical lens (5).
The lighting device according to any one of claims 1 to 3.