JP2001201719A - Light source lamp and light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source lamp in which use efficiency of a light beam is enhanced by reducing the diffusion of the light beam owing to reflection. SOLUTION: The light source lamp 1 has a light-emitting tube 2 and a reflection mirror 3, and the reflective surface of the reflection mirror 3 is equipped with a curved reflective surface 4 of the shape of a concave surface, and an irregular reflective surface 5 which is connected to the opening edge of the surface 4. The irregular reflective surface 5 has a constitution that a very small reflecting plate 8 of cubic type are arrayed lengthwise and breathwise, and reflects incident light in the direction parallel to the incident light concerned. Divergent light from the light-emitting tube 2 is surely reflected toward the light-emitting tube 2, when made incident on the irregular reflective surface 5. The light beam made incident on the irregular reflective surface 5 is emitted as parallel light, without being diffused to the outside. Thus, the use efficiency of the light beam and emission luminous intensity can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source lamp that can be used as a light source for various optical devices.
Further, the present invention relates to a polarized light source device configured to use the light source lamp and emitting outgoing light composed of only a specific polarized light component and used as a light source device such as a liquid crystal projector.

[0002]

2. Description of the Related Art In a liquid crystal display device such as a liquid crystal projector, a parallel light from a light source lamp such as an arc lamp such as a metal halide lamp or a halogen lamp is radiated to a light valve formed of a liquid crystal panel, and a display image is formed in the light bubble. After the corresponding modulation, a projection image is formed on a projection surface via a projection optical system. A liquid crystal light valve that modulates light corresponding to image information uses only a specific polarization component. Even if the liquid crystal light valve is irradiated with parallel light emitted from a light source lamp as it is, the polarization direction differs. Since the light component is not used, the light use efficiency is low and the projected image cannot be brightened.

Therefore, conventionally, parallel light emitted from a light source lamp is guided to a polarization conversion optical system, the polarization direction is adjusted through the parallel light, and then irradiated to a liquid crystal light valve, thereby increasing the light use efficiency. To obtain a bright projected image. For example, JP-A-8-29734 discloses a light source of a display device having such a polarization conversion optical system. Also, Japanese Patent Application Laid-Open No. 3-13983 discloses a projection type liquid crystal display device provided with a polarization conversion optical system.

Here, the present applicant has disclosed in Japanese Patent Application Laid-Open No. 11-9517.
Japanese Patent Laid-Open No. 2 (1994) proposes a polarized light source device capable of performing polarization conversion with little loss of light amount and without lowering polarization efficiency. In addition, a polarization light source device has been proposed in which the number of optical elements required for performing polarization conversion can be reduced and the size of the optical elements can be reduced.

Further, the present applicant has disclosed in Japanese Unexamined Patent Application Publication No. 11-9517.
In Japanese Patent Laid-Open Publication No. 2 (1993) -207, there has been proposed a polarization light source device having two light source lamps and a polarization conversion optical system, which is capable of performing polarization conversion with a small loss of light amount and without lowering the polarization efficiency. ing. In a polarized light source device having two light source lamps and a polarization conversion optical system,
There has been proposed a configuration in which an optical element required for performing polarization conversion can be reduced in size, thereby realizing a reduction in the size of an apparatus and a reduction in manufacturing cost.

On the other hand, the present applicant has disclosed in Japanese Unexamined Patent Application Publication No. 11-95171.
In the publication, a light source device comprising two light source lamps and a synthetic optical system for synthesizing light beams emitted therefrom and emitting as a single synthesized light beam can be configured to be small, compact and inexpensive. Has been proposed. In addition, a configuration has been proposed in which the light use efficiency of a light source device having such two light source lamps can be improved.

[0007]

In the light source lamp and the light source device described in the above publications proposed by the present applicant, a part of the parallel light emitted from the emission opening of the light source lamp is reflected by the shielding reflector. By returning to the side of the light source lamp, the parallel light beam emitted from the light source lamp is reduced in diameter. Therefore, it is necessary to ensure that the light reflected by the shielding reflector returns to the light emitting point of the light source lamp.

However, the light emitted from the emission opening of the light source lamp contains a divergent light component, and when the divergent light hits the reflection surface of the shielding reflector perpendicular to the emission optical axis, the reflected light of the light becomes Since the light is reflected in a direction different from the incident direction, the light does not return to the light emitting point of the light source lamp. For this,
In the case where the shielding reflector is used, a part of the divergent light is lost, so that parallel light having the expected intensity cannot be obtained.

In view of the above, an object of the present invention is to propose a light source lamp capable of reducing a divergent light component contained in emitted light.

Another object of the present invention is to propose a light source device using such a light source lamp.

Another object of the present invention is to propose a light source device using a plurality of such light source lamps.

[0012]

SUMMARY OF THE INVENTION The present invention has an arc tube and a reflector, and the reflector reflects an emission opening of reflected light and divergent light from the emission tube toward the emission opening. In a light source lamp having a reflecting surface, the reflecting surface has a concave curved surface, and an uneven reflection formed on an inner peripheral surface extending from an outer peripheral edge of the curved reflecting surface to the emission opening. The concave-convex reflective surface is composed of a reflector array in which cubic-type minute reflectors that reflect incident light so as to become reflected light parallel to the incident light are arranged vertically and horizontally. It is characterized by:

In the light source lamp according to the present invention, the reflection surface portion on the emission opening side is an uneven reflection surface composed of a cubic-type reflector plate array. The light is reflected as parallel reflected light and surely returns to the light emitting point. Therefore, the reflected light is converted into parallel light on the concave curved curved reflecting surface and exits from the exit opening. Therefore, the divergent light heading toward the opening edge of the reflecting mirror can be returned to the light emitting point and collimated, so that the light loss can be reduced and the light use efficiency can be increased.

On the other hand, the present invention has an arc tube and a reflecting mirror, and the reflecting mirror has an emission opening for reflected light, and a reflection surface for reflecting divergent light from the emission tube toward the emission opening. In the light source lamp comprising: a flat-shaped shielding reflector that shields a part of the emission opening, and the shielding reflector has an uneven reflection surface on a surface facing the reflection surface of the reflection mirror. The concave-convex reflection surface is provided with a reflector array in which cubic-type micro reflectors that reflect incident light so as to become reflected light parallel to the incident light are arranged vertically and horizontally. And

Also in this case, the divergent light incident on the shielding reflector is reflected in the incident direction and returns to the light emitting point, so that it is converted into parallel light and exits from the exit aperture.
Therefore, the loss of divergent light can be reduced, and the light use efficiency can be improved.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a light source lamp and a light source device to which the present invention is applied will be described with reference to the drawings. (Example of Light Source Lamp) FIG. 1 shows an embodiment of a light source lamp to which the present invention is applied. As shown in FIG. 1, the light source lamp 1 includes an arc tube 2 and a reflecting mirror 3 that reflects divergent light from the arc tube 2 so as to become parallel light. The arc tube 2 is an arc lamp such as a metal halide lamp or a halogen lamp. The reflecting mirror 3 includes a concave curved reflecting surface 4 and an uneven reflecting surface 5 extending parallel to the lamp optical axis 1a continuously to the opening edge 4a of the curved reflecting surface 4.

The curved reflecting surface 4 is an elliptical surface or a parabolic reflecting surface, and the uneven reflecting surface 5 is a lens in which cubic-type microlenses for reflecting incident light in a direction parallel to the incident light are arranged vertically and horizontally. Consists of an array. In this example, when the boundary 6 between the curved reflecting surface 4 and the uneven reflecting surface 5 is viewed in the direction of the lamp optical axis 1a, the emission center 2 of the arc tube 2
a. The exit opening 7 of the reflecting mirror defined by the opening edge of the uneven reflecting surface 5 has a square shape. Therefore, the uneven reflecting surface 5 is formed on the inner peripheral surface of a square tube. The reflection surface 5 is smoothly continued to the curved reflection surface 4 at the boundary 6.

In the light source lamp 1 having this configuration, the divergent light from the arc tube 2 includes a light component directly emitted from the emission opening 7 and a light component directed to the curved reflecting surface 4 as indicated by a line segment L1. As shown by the line segment L2, a light component traveling toward the uneven reflection surface 5 is included. Light L1 directed to the curved reflecting surface 4
Is reflected by the curved reflecting surface 4 as parallel light parallel to the optical axis 1a, and exits through the exit aperture 7.

On the other hand, the light L2 directed to the uneven reflecting surface 5 is reflected by the reflecting surface 5 in a direction parallel to the incident light L2. In other words, FIG.
As shown in this figure, the uneven reflecting surface 5 is composed of a reflector array in which cubic-type minute reflectors 8 are arranged vertically and horizontally. As shown in FIG. , Three square reflecting surfaces 8a to 8c orthogonal to each other. Therefore, the incident light L2 is reflected on one reflecting surface 8a and then on the other reflecting surface 8b, and becomes reflected light L2r traveling in the same direction as the incident light L2.

Here, since the light L2 is emitted from the arc tube 2, the reflected light L2r returns to the light emitting point of the arc tube 2 again. As shown in FIG. 1A, the reflected light L2r enters the curved reflecting surface 4 after passing through the light emitting point, is reflected there, becomes parallel light parallel to the optical axis 1a, and exits from the exit opening 7. Emit.

As described above, the light source lamp 1 of the present embodiment is provided with the uneven reflecting surface 5 as the reflecting surface near the emission opening 7. Since the uneven reflecting surface 5 reflects incident light as reflected light traveling in the same direction, the divergent light from the arc tube 2 is reflected by the uneven reflecting surface 5 and returns to the arc tube 2 again.
Therefore, similarly to the divergent light traveling from the arc tube 2 toward the curved reflecting surface 4, the light enters the curved reflecting surface 4 and is emitted as parallel light parallel to the optical axis 1a. Therefore, the light use efficiency is enhanced, and the light intensity of the emitted parallel light can be increased.

On the other hand, as shown in FIG. 2, in the conventional light source lamp, a flat reflecting surface 9 is formed in the vicinity of the exit opening, so that the divergent light directed toward the portion is different from the incident direction. Since the light is reflected in the direction and is not used as parallel light, the light use efficiency is low. In FIG. 2, portions corresponding to the respective portions of the light source lamp 1 in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. (Another Example of Light Source Lamp) FIG. 3 shows another example of a light source lamp to which the present invention is applied. The light source lamp 31 shown in FIG. 1 includes an arc tube 32, a reflecting mirror 33 that reflects divergent light from the arc tube 32 into parallel light, and a reflecting mirror 33.
And a shielding reflection plate 35 disposed in front of the emission opening 37 of FIG. The arc tube 2 is an arc lamp such as a metal halide lamp or a halogen lamp. The reflecting mirror 3 is an elliptical surface or a parabolic reflecting surface, and its exit opening 37 is a circular opening.

The shielding reflector 35 is disposed at a position slightly forward of the emission opening 35 in a state perpendicular to the lamp optical axis 31a. The shielding reflector 35 has a square shape in which the circular exit opening 35 is inscribed.
At the center thereof, a square injection opening 39 inscribed in the injection opening 35 is opened. Further, an uneven reflecting surface 35a is formed on the surface on the reflecting mirror side.

As shown in FIG. 1 (c), the concave-convex reflecting surface 35a also comprises a reflector array in which cubic-type microreflectors for reflecting incident light in a direction parallel to the incident light are arranged vertically and horizontally. Have been.

In the light source lamp 31 having this configuration, the divergent light from the arc tube 32 is emitted as a parallel light beam having a square cross section defined by the square emission opening 39 of the shielding reflector 35. That is, the divergent light from the arc tube 32 is reflected by the reflecting surface 34 of the reflecting mirror 3 and becomes parallel light, and travels forward. Of these lights, the light in the peripheral portion is reflected in the same direction by the uneven reflecting surface 35a of the shielding reflecting plate 35, which is one size smaller than the emission opening 37 of the reflected light. Therefore, the light reflected by the concave-convex reflecting surface 35a returns to the reflecting surface 34 again, where it is reflected again, becomes parallel light, and exits from the exit opening 39.

In this light source lamp 31, the shielding reflector 3
By using 5, the aperture of the emitted light can be narrowed. In addition, since the uneven reflection surface 35a that reflects light in the incident direction is provided as the reflection surface of the shielding reflection plate 35, the light incident on the reflection surface 35a always returns to the direction of the incident light and diverges to the outside. It is possible to reduce the amount of lost light. Therefore, according to the light source lamp 31 of the present embodiment, it is possible to form an outgoing parallel light beam having an arbitrary cross-sectional shape with high intensity.

Next, the light source lamp 41 shown in FIG.
This is an example in which a plurality of shielding reflectors 45 are used, and other configurations are the same. The shielding reflection plate 45 of this example has a horizontally long rectangular shape, and a concave-convex reflection surface 45a as shown in FIG. 1C is formed on the surface on the reflection mirror side.

A light source lamp 51 shown in FIG. 5 is an example in which a shielding reflector 55 is used in place of the shielding reflector 35 in the above-described light source lamp 31, and the other configuration is the same. The shielding reflector 55 of this example has a square outline circumscribing the exit opening of the reflector, and has a circular exit opening 5 slightly smaller than the exit opening of the reflector at the center.
9 are formed. Also in this case, an uneven reflecting surface 55a as shown in FIG. 1C is formed on the surface on the reflecting mirror side. FIG. 6 shows an optical system of a polarized light source device to which the present invention is applied. As shown in this figure, a polarized light source device 61 includes a light source lamp 64 having an arc tube 62 and a reflecting mirror 63 for reflecting divergent light from the arc tube 62 into parallel light.
And a polarization conversion optical system 65 that aligns the polarization direction of the parallel light from the light source lamp 64 and emits the light as polarized light.

The arc tube 62 of the light source lamp 64 is an arc lamp such as a metal halide lamp or a halogen lamp.
Further, as the reflecting mirror 63, an elliptical reflecting surface 63a or a parabolic reflecting surface can be used. The divergent light from the arc tube 62 is reflected directly or on the reflecting surface 63a, becomes a substantially parallel light beam as a whole, and is emitted through the circular exit opening 63b of the reflecting surface. However, in the present example, one side of the circular emission opening 63b around one axis of symmetry is closed by a reflector. That is, the lower semicircular portion of the circular emission opening 63b in FIG. 6 is closed by the semicircular reflecting plate 66 having a shape corresponding to the semicircle.

The reflecting surface 66a of the reflecting plate 66 is shown in FIG.
(C) is an uneven reflecting surface for reflecting incident light in a direction parallel to the incident light.
4a is orthogonal. Therefore, the parallel light flux having a semicircular cross section illuminating the reflecting surface 66a of the reflecting plate 66 is reflected in the same direction, is reflected again by the reflecting surface 63a of the reflecting mirror 3, and returns to the other side (in the drawing) of the circular exit opening 63b. The light is emitted toward the polarization conversion optical system 65 through the (upper) semicircular opening 63c.

In this embodiment, the semicircular opening 63c is used.
An infrared ray elimination filter 67 is disposed on the emission side of the light source. A parallel light flux I having a semicircular cross section indicated by a hatched portion in FIG.
Is emitted.

Next, the polarization conversion optical system 65 has a polarization beam splitter 68 made of a prism composite, and the polarization beam splitter 68
A first polarized light separating film 611 orthogonal to a and a second polarized light separating film 612 extending in a direction perpendicular to one end of the first polarized light separating film 611 are provided. These first
The polarization separation characteristics of the second polarization separation films 611 and 612 are the same. For example, only the light I (s) of the S polarization component included in the parallel light flux I is reflected, and the light I (p) of the P polarization component is reflected.
Is set so as to transmit light. Such a polarization separation film can be configured as, for example, a dielectric multilayer film.

Behind the polarizing beam splitter 68 in the direction of the light source optical axis 64a, a quarter-wave plate 613 is provided.
The total reflection plates 614 are arranged in this order. Further, a condenser lens 615 is disposed on the rear side of the optical path with respect to the S-polarized light emission surface 68a of the polarization beam splitter 68 that is parallel to the light source optical axis 64a.

The polarized light source device 6 of the present embodiment configured as described above.
In 1, polarization conversion is performed on the parallel light flux I having a semicircular cross section emitted from the light source lamp 64 in the following manner, and the polarized light flux I (ou) whose polarization direction is aligned with the S polarization direction is obtained.
The light is emitted as t).

First, only the light I (s) of the S-polarized light component is reflected by the first polarization separation film 611 of the polarizing beam splitter 68, and the light I ( p) is transmitted as it is. The reflected S-polarized light component I (s) is emitted through the emission surface 68a and the condenser lens 615. Light I of P polarization component
In (p), after transmitting through the first polarization separation film 611, the second polarization separation film 612 having the same polarization separation characteristic further transmits. Thereafter, after the polarization direction is rotated by 45 degrees via the quarter-wave plate 613, the light is reflected by the total reflection plate 614 in the same direction and transmits through the quarter-wave plate 613 again.
As a result, the light I (p) of the P-polarized light component is
3 passes twice, so that its polarization direction is rotated by 90 degrees and becomes light I ′ (s) of the S-polarized component. Accordingly, the light is reflected at a right angle by the second polarization separation film 612, and is emitted through the emission surface 68 a of the polarization beam splitter 68 and the condenser lens 615.

Here, the light I ′ (s) of the S-polarized light component obtained by the polarization conversion is in a state where its cross-sectional shape is inverted. As a result, the polarized light flux I (out) obtained via the condenser lens 615 has a circular cross section corresponding to the circular emission opening 663b of the light source lamp 64.

As described above, in the polarized light source device 61 of the present embodiment, the emitted light beam to be subjected to polarization conversion may be half the size of the emission opening of the light source lamp. Therefore, as in the related art, a polarizing prism or a prism having a size corresponding to the emission aperture of the light source lamp is used.
Compared to an optical system having a / 4 wavelength plate, the size of the optical element can be halved, and the entire optical system can be made small and compact. Also, the price will be lower.

In this embodiment, since the reflecting plate 7 has the reflecting surface having the structure shown in FIG. 1C, the light incident thereon can be surely returned to the reflecting mirror side. Therefore, the light use efficiency can be increased, and the intensity of the emitted light can be increased.

Furthermore, the optical path length required for the polarization conversion can be shortened, and the number of times that the polarization component to be subjected to the polarization conversion passes through the quarter-wave plate only needs to be twice. Also, a decrease in polarization efficiency can be suppressed. (Second Example of Single Light Source Type Polarized Light Source Device) FIG. 7 shows an optical system of a polarized light source device having another configuration to which the present invention is applied. This polarized light source device 71 is different from the polarized light source device 61 according to the first embodiment in that the 変 換 wavelength plate 61 in the polarization conversion optical system 75A.
3 and the total reflection plate 614, instead of the polarization component light I (p) after passing through the second polarization separation film 612.
Is rotated by 90 degrees, and the second
That is, a reflective liquid crystal device 721 that performs total reflection toward the polarization separation film 612 is disposed. Since other configurations are the same, corresponding portions are denoted by the same reference numerals in the drawings, and description thereof will be omitted.

In the polarized light source device 71 having this configuration,
The same functions and effects as those of the polarized light source device 61 can be obtained. In addition, the number of times that the polarization component to be subjected to polarization conversion passes through the optical element can be reduced, and the number of optical elements required for polarization conversion can be reduced. There is an advantage that an optical system with a small decrease in the image quality can be realized. (Third Example of Single Light Source Type Polarized Light Source Device) FIG. 8 shows an optical system of a polarized light source device having still another configuration to which the present invention is applied. In the polarized light source device 81, the first
The difference from the polarized light source device 61 according to the example is that the second polarized light separating film 612, the 波長 wavelength plate 613, and the total reflection plate 6
Instead of arranging the light 14, the light I (p) of the polarization component transmitted through the first polarization separation film 611 is reflected, and the light I (s) of the polarization component reflected by the first polarization separation film 611 is reflected. ), The first and second total reflection plates 831 and 8 that emit light in the same direction as
32, and the half-wave plate 833 is arranged on the optical path which is reflected by the second total reflection plate 832 and reaches the condenser lens 615.

The number of the reflecting plates 831 and 832 may be three or more, and the shape of the emitted light I ′ (s) is the light I (s).
What is necessary is just to be in a symmetrical state. Also, the half-wave plate 833
May be located on the incident side of the first total reflection plate 831, that is, on the optical path between the first total reflection plate 831 and the first polarization splitting film 611, or the first and second total reflections. Board 83
1, 832 may be on the optical path.

In the polarization light source device 81 thus configured, since an inexpensive reflector is used instead of the expensive second polarization separation film 612, there is an advantage that an increase in the manufacturing cost of the optical system can be suppressed. is there. (Other Embodiments of Single Light Source Type Polarized Light Source Device) In each of the above embodiments, as a characteristic of the polarized light separating film, S polarized light is reflected,
Although it is assumed to transmit the P-polarized light, it is needless to say that a light having the opposite separation characteristic may be used.

In the above description, the light source lamp has a circular exit opening shape. However, the light source lamp may have a shape other than a circular shape, and basically has a line-symmetrical opening shape.

On the other hand, the polarized light source device according to the present invention can be used not only as a light source for a front type liquid crystal projector and a rear type liquid crystal projector, but also as a light source for an optical device requiring other polarized light sources. (First Example of Dual Light Source Type Polarized Light Source Device) FIG. 9 shows an optical system of a dual light source type polarized light source device to which the present invention is applied. Referring to this drawing, the polarized light source device 91
Are polarized light beams I (2) and I (3) by aligning the polarization directions of the first and second light source lamps 92 and 93 and the light beams I (2) and I (3) emitted from the first and second light source lamps 92 and 93. o
out) as a polarization conversion optical system 94.

The first light source lamp 92 outputs the outgoing light flux I
(2) An emission opening 92a and a first reflection plate 92b are provided, and the first reflection plate 92b shields the emission opening 92a on one side half with respect to one symmetry axis of the opening shape. The light emitted from the portion is reflected in the opposite direction. In the illustrated example, the injection opening 92
a is a circle, in this case, a semicircular portion on one side of the injection opening 92a is shielded, and a semicircular portion 92c on the opposite side.
The outgoing light flux I (2) having a semicircular cross section is emitted only from the light source.
The reflecting surface of the reflecting plate 92b is an uneven reflecting surface as shown in FIG. 1 (c), and reflects light incident thereon in the incident direction.

The second light source lamp 93 has the same configuration as the first light source lamp 92, and includes an emission opening 93a for the emitted light flux I (2) and a second reflection plate 93b.
The reflecting plate 93b shields the emission opening 93a on one half with respect to one symmetry axis of the opening shape, and reflects the light to be emitted from the one side in the opposite direction. In the illustrated example, the exit opening 92a is circular, and therefore, the outgoing light flux I (3) having a semicircular cross section is emitted only from the semicircular portion 93c on one side. This reflection plate 93
b is an uneven reflecting surface as shown in FIG. 1C, and reflects light incident thereon in the incident direction.

Here, the first and second light source lamps 9
The emission openings 92a and 93a of the second and the third 93 have the same shape. Therefore, the one-side portions 92c and 93c that are not shielded by the reflection plates 92b and 93b have the same shape. Furthermore, these portions 92c and 93c are set to be on the same side.

The polarization conversion optical system 94 includes first and second quarter-wave plates 95 and 96, first and second polarization separation films 97 and 98, and first and second total reflection films 911. , 9
12 are provided. First and second polarization separation films 9
Reference numerals 7 and 98 have the same polarization separation characteristics, transmit light of a specific polarization component, and reflect light of a polarization component whose polarization direction is orthogonal to the polarization component. In the illustrated example, first and second polarization separation films 97 and 98 made of a dielectric multilayer film are formed on the mating surface of the prism composite. Also, the first and second total reflection films 911 and 91
2 is formed in a back-to-back state.

Next, the arrangement of the above-described optical elements will be described. First, the first and second light source lamps 92,
Numerals 93 are arranged facing each other so that the light source optical axes 92d and 93d are parallel. In the illustrated example, the light source optical axes 92d and 93d are arranged so as to coincide with each other.

The first and second light source lamps 92,
Between 93, on the optical path of the light flux I (2) emitted from the first light source lamp 92, the first polarized light separating film 97 is arranged in a state inclined at 45 degrees with respect to the light source optical axis 92d. . On the other hand, on the optical path of the light flux I (3) emitted from the second light source lamp 93, the second polarization splitting film 98 is arranged in a state inclined in the opposite direction by 45 degrees. In the illustrated example, one ends of the first and second polarization separation films 97 and 98 are arranged so as to form a right angle.

A first total reflection film 911 is provided between the first and second polarization separation films 97 and 98 on the optical path of the light flux I (2) emitted from the first light source lamp 92.
Is perpendicular to the light source optical axis 92d and the first light source lamp 92
Are arranged facing each other. In contrast, the second
On the optical path of the light flux I (3) emitted from the light source lamp 93, a second total reflection film 912 is disposed in a direction perpendicular to the light source optical axis 93d and facing the second light source lamp 93. .

Further, on the optical path between the first light source lamp 92 and the first polarization separation film 911, a first quarter-wave plate 95 is disposed in a state perpendicular to the light source optical axis 92d. On the optical path between the second light source lamp 39 and the second polarization separation film 912, a second quarter-wave plate 96 is arranged in a state perpendicular to the light source optical axis 93d.

In addition to the above configuration, in the illustrated example, the first and second infrared removing filters 913 and 91 are further provided.
Four. The first infrared filter 913 is disposed between the emission opening 92 a of the first light source lamp 92 and the first quarter-wave plate 95, and the second infrared filter 9
14 is arranged between the emission opening 93 a of the second light source lamp 93 and the second quarter-wave plate 96. Further, a condenser lens 915 is arranged on the polarization conversion optical system 94 on the emission side of the polarized light beam.

The first and second light source lamps 92,
The arc tubes 93e and 93e are arc lamps and halogen lamps such as metal halide lamps. As the reflecting mirrors 92f and 93f, those having an elliptical reflecting surface 93 or parabolic reflecting surfaces can be used.

The operation and effect of the polarized light source device 91 configured as described above will be described. First, a part of the divergent light from the arc tube 92e of the first light source lamp 92 is directly reflected by the reflecting mirror 92f.
And is reflected here, and is emitted from the semicircular opening portion 92c of the emission opening. The remaining portion of the divergent light travels backward through the divergent light path by the reflector 92b blocking half of the exit aperture 92a to reach the reflector 92f, where it is reflected and exits through the semicircular aperture 92c. In this way, the light beam emitted from the light source lamp 92 has a semicircular cross section.

Here, the reflecting mirror 92f reflects visible light,
It is desirable to use a so-called cold mirror that transmits infrared rays. With this configuration, the light reflected from the reflecting mirror 92f is in the visible light band.

The light beam I (2) having a semicircular cross section emitted from the first light source lamp 92 is
After passing through 4 and removing the near-infrared wavelength band, it is guided to the polarization conversion optical system 4. First, after passing through the 偏光 wavelength plate 95, the light reaches the first polarization separation film 97. The first polarization separation film 97 has, for example, a polarization separation characteristic of reflecting S-polarized light and transmitting P-polarized light. In this case, the emitted light flux I irradiating the first polarization separation film 97
The light S (2) of the S-polarized light component contained in (2) is reflected in the orthogonal direction and exits to the condenser lens 915 side. On the other hand, the light P (2) of the P-polarized light component included in the outgoing light flux I (2) passes through the first polarization separation film 97 as it is and reaches the total reflection film 911, where it is directed in the opposite direction. The light is totally reflected, passes through the first polarization separation film 97 again, and returns to the light source lamp 92 side. This return light P (2) is the first 1
After passing through the 波長 wavelength plate 95 and rotating the polarization plane by 45 degrees, the light returns to the light source lamp 2 through the semicircular opening 92 c. Thereafter, the light is reflected by the reflecting mirror 92f and the reflecting plate 92b, is again emitted from the semicircular opening 92c, passes through the infrared ray removing filter 914, and passes through the first quarter-wave plate 95. Thereby, the polarization plane is rotated again by 45 degrees. As a result, the light P (2) is changed to light S ′ (2) of the S-polarized light component. As a result, the first polarization separation film 97
Are reflected in the orthogonal direction at
5 is emitted. In this way, all the divergent light from the first light source lamp 92 is emitted as a luminous flux (S (2) + S ′ (2)) having a semicircular cross section of the S-polarized component and is emitted through the condenser lens 915. You.

In the case of the outgoing light flux I (3) having a semicircular cross section from the second light source lamp 93, the polarization conversion is similarly performed, and the outgoing light flux (S (3) +
S ′ (3)), and is emitted through the condenser lens 915.

Here, the luminous fluxes (S (2) + S '(2)) from both obtained in this way and (S (3) +
Since S ′ (3)) has an axisymmetric semicircle, the combined light flux I after being combined via the condenser lens 915
(Out) is a light beam having a circular cross section, which has a shape corresponding to the circular emission openings 92a and 93a of each light source lamp.

As described above, in the polarized light source device 91,
The output light beam to be subjected to polarization conversion may be half the size of the emission aperture of the light source lamp. Therefore, the size of the optical element can be halved compared to the conventional optical system including a polarizing prism or a quarter-wave plate having a size corresponding to the emission aperture of the light source lamp, and the entire optical system can be reduced. It is possible to make it small and compact, and the cost is reduced accordingly.

Further, in this embodiment, since a reflector made of a cubic-type minute reflector is used as the reflector, the loss of divergent light can be reduced, the utilization efficiency of light can be increased, and the emission intensity can be increased. Can be improved.

Furthermore, the optical path length required for the polarization conversion can be reduced, and the number of times that the polarized light component to be polarized light passes through the quarter-wave plate only needs to be three times. Also, a decrease in polarization efficiency can be suppressed. In addition, the size of the polarizing prism on which the polarization splitting film is formed can be halved, and accordingly, the optical path length in the prism is shortened, so that light absorption loss can be reduced. As a result,
A high-brightness polarized light source device having two light source lamps can be realized.

Further, in a liquid crystal projector or the like, it is an important issue how to effectively take measures against heat on the light source side and how to efficiently cool around the liquid crystal. In the present invention, for example, 1/1 of the total luminous flux is used. 2 is reflected by a reflecting mirror 2f.
Are emitted as primary reflected light, of which components that require polarization conversion enter the reflecting mirror 2f, which is a cold mirror, five times. Therefore, it is extremely effective in heat measures. (Second Example of Two-Light Source Polarized Light Source) FIG. 10 shows another example of the polarized light source of the present invention. The basic components of the polarized light source device 101 are the same as those of the polarized light source device 91 in FIG. The difference is that the first and second total reflection films 911 and 912 are omitted, and that the first and second light source lamps 92 and 93 are arranged to face each other so that the light source optical axes 92d and 93d coincide. is there.

In the polarized light source device 101, of the light flux I (2) having a semicircular cross section from the first light source lamp 92, the light of the polarized light component, for example, P, which has passed through the first polarized light separating film 97 as it is. The polarization component light P (2) is directed to the second light source lamp 93 on the opposite side, passes through the second polarization separation film 98, and then passes through the second quarter-wave plate 96 to its polarization plane. Is rotated by 45 degrees and then enters the second light source lamp 93. Then, after being repeatedly reflected by the second light source lamp 93, the light is again emitted from the semicircular opening 93 c, and the polarization plane is again changed to 45 through the ４ wavelength plate 96.
The light is rotated by a degree, and is changed to light S ′ (2) of the S-polarized light component. As a result, the light is reflected in the orthogonal direction by the second polarization splitting film 98 and is emitted to the condenser lens 915 side.

The luminous fluxes (S (2) + S '(3)) emitted from both thus obtained and (S (3) + S')
Since (2)) has an axisymmetric semicircle, the combined light beam I (out), which is a polarized light beam after being combined via the condenser lens 915, is a light beam having a circular cross section, and this shape is different from each light source lamp. Has a shape corresponding to the circular injection openings 92a and 93a.

FIG. 9 shows the polarized light source device 101 of this embodiment.
The same effect as the polarized light source device 91 shown in FIG. (Third Example of Two-Light Source Polarized Light Source Device) Next, FIG. 11 shows still another example of the polarized light source device. The basic components of the polarized light source device 111 are the polarized light source device 9 shown in FIG.
Same as 1. The difference is that the first and second light source lamps 92, 93 are arranged so that their light source optical axes 92d, 93d are orthogonal to each other, and accordingly, the first and second quarter wave plates 95, 96 are arranged. In which the arrangement positions of the first and second infrared removal filters 913 and 914 are changed, and the rear side of the second polarization separation film 98 in the direction along the light source optical axis 93d of the second light source lamp 93. 1/2 on the optical path of
The point is that a wave plate 116 is added.

In the polarized light source device 111 having this configuration, the luminous flux I (3) emitted from the second light source lamp 93 is
By the polarization conversion optical system including the second quarter-wave plate 96, the second polarization separation film 98, and the total reflection film 912, an output light beam whose polarization planes are all aligned in the same direction is obtained.
The light is emitted toward the half-wave plate 916. The polarization direction of the emitted light beam is a direction orthogonal to the emitted light beam having a uniform polarization direction obtained from the first light source lamp 92 via the polarization conversion optical system. Therefore, the polarization plane is rotated by 90 degrees via the half-wave plate 916, and the polarization planes are aligned to be the same. Thereafter, the polarization planes obtained from the two light source lamps 92 and 93 are the same, and the outgoing luminous flux having a semicircular cross section is combined via the condenser lens 915 and emitted as the outgoing luminous flux I (out) having the circular cross section. You.

Here, as a modified example of the polarized light source device 111, the polarized light separating characteristic of the second polarized light separating film is made opposite to that of the first polarized light separating film, and the half-wave plate is omitted. A configuration can be given. For example, when the first polarization separation film 97 reflects S-polarized component light and transmits P-polarized component light, the second polarization separation film 98
The light of the polarization component is reflected, and the light of the S polarization component is reflected.

The same effects as those of the polarized light source device 91 shown in FIG. 9 can be obtained by the polarized light source device 111 having the above-described configuration and its modified example. (First Example of Dual Light Source Type Light Source Device) Next, FIG. 12 shows an optical system of a dual light source type light source device to which the present invention is applied.
The light source device 121 according to the present embodiment will be described with reference to FIG.
Are first and second light source lamps 122 and 123, and first and second light beams I (2) emitted from the first and second light source lamps 122 and 123, respectively.
It has a combining optical system 124 that combines I (3) and emits it as a single combined light flux I (out). In the figure, the cross-sectional shapes of the first and second emitted light beams I (2) and I (3) and the combined light beam I (out) are indicated by oblique lines. First and second light source lamps 122, 1
23 is an arc tube 122a, 123a and a reflecting mirror 122b, 1
23b.

The first light source lamp 122 has a first emission opening 122c from which the first emission light beam is emitted, and a first shielding reflector 122d. The first shielding reflector 122d shields an outer peripheral portion of the first emission opening 122c to form a first rectangular emission opening 122f centered on the light source optical axis 122e. Further, the first shielding reflection plate 122d reflects the emitted light radiated thereon.
That is, the reflection surface is perpendicular to the light source optical axis 122e and formed on the side facing the arc tube 122a. The light source lamp 122 having this configuration is similar to the light source lamp shown in FIG. 5, and the reflection surface of the reflection plate is formed of a cubic-type minute reflection plate.

The second light source lamp 123 has the same configuration. That is, the second light source lamp 123 includes the second emission opening 123c from which the second emission light beam is emitted, and the second shielding reflector 123d. The second shielding reflection plate 123d shields the outer peripheral portion of the second emission opening 123c to form a second rectangular emission opening 123f centered on the light source optical axis 123e. Further, the second shielding reflection plate 123d reflects the outgoing light irradiated to the second shielding reflection plate 123d. That is, the reflection surface is perpendicular to the light source optical axis 123e and formed on the side facing the arc tube 123a.

Here, as shown in FIG.
The second rectangular emission openings 122f and 123f are vertically elongated rectangles having the same shape. For example, the aspect ratio is set to 1: 0.5.

On the other hand, the combining optical system 124 includes the first and second reflecting plates 125 and 126 and the condenser lens 12.
7 is provided.

Next, the arrangement relationship of the above components will be described. First, the first and second light source lamps 122, 123
Are arranged facing each other such that the light source optical axes 122e and 123e are parallel to each other. In the illustrated example, the two light sources are arranged so that their optical axes coincide.

The first and second light source lamps 12
Between the positions 123 and 123, a state in which the reflection surface faces the first light source lamp 122 with the first reflection plate 125 inclined at 45 degrees on the light source optical axis 122e of the first light source lamp 122. Are located in On the other hand, on the light source optical axis 123e of the second light source lamp 123, the reflection surface faces the side of the second light source lamp in a state where the second reflection plate 126 is inclined 45 degrees in the opposite direction. Are placed in a state.

The first and second reflectors 125, 1
26, that is, the light source optical axes 122e and 123
On the side orthogonal to e, a condenser lens 127 is arranged.

The first and second light source lamps 12
The arc tubes 122a and 123a are arc lamps such as metal halide lamps and halogen lamps. Further, as the reflecting mirrors 122b and 123b, those having an elliptical reflecting surface or a parabolic reflecting surface can be used.

The operation of the light source device 121 thus configured will be described. In the first light emitting lamp 122, of the divergent light from the light emitting tube 122a, a light source optical axis 122e drawn from the light emitting point P0 toward the reflecting surface of the reflecting mirror 122b.
All of the light beams inside the intersection point P1 with the reflection surface of the line segment orthogonal to are passed through the first rectangular opening 122f centered on the light source optical axis 122e, and are emitted as an emitted light beam I (2) having a rectangular cross section.

The luminous flux density of the light source lamp 122 has a distribution showing a high concentration of light at the center when viewed on a plane orthogonal to the central axis of the luminous flux. Therefore, by forming the first rectangular opening 122f around the optical axis of the light source, an outgoing light portion having a high luminous flux density can be extracted, and the light use efficiency is high.

Here, from the light emitting point P0 of the arc tube 122a of the first light source lamp 122, the light source optical axis 12
Reflecting mirror 122 when measured in a direction orthogonal to 2e
Distance from b to reflection surface (distance from point P0 to point P1)
It is desirable to set the length of the first rectangular emission opening 122f in the short side direction to twice that of the first rectangular emission opening 122f. With this configuration, the light (a) emitted from the arc tube 122a and radiated outward from the reflection point P1 is reflected by the reflection surface of the first shielding reflection plate 122d and then again reflected by the reflection surface of the reflection mirror 122b. Are reflected once or multiple times by the
It is emitted from 2f. In other words, light components that are repeatedly reflected between the reflection mirror 122b and the reflection surface of the first shielding reflection plate 122d and are not used as output light can be substantially reduced to zero. As a result, the light use efficiency can be further improved.

Similarly, the second light source lamp 123 emits outgoing light I (3) having a rectangular cross section through the second rectangular emission opening 123f.

The traveling direction of the first outgoing light I (2) from the first light source lamp 122 is changed to a right angle by the first reflecting plate 125, and the first outgoing light I (2) passes through the condenser lens 127 arranged on the lower side in FIG. Proceed towards. Similarly, the second emitted light I (3) from the second light source lamp 123 is directed to the condenser lens 127 after the traveling direction is bent at a right angle by the second reflector 126. These first and second emitted lights I (2) and I (3) are emitted as a single combined light flux I (out) having a rectangular cross-sectional shape via a condenser lens 127.

Here, the light source device 12 thus configured
When using 1 as a light source for a liquid crystal projector,
The aspect ratio of the illumination area of the liquid crystal light valve to be illuminated is 3:
4 in view of the rectangular shape of the light source device 1
It is desirable that the first and second rectangular emission openings 122f and 123f have the following shapes. That is, the first
In addition, it is desirable that the aspect ratio of the second exit rectangular openings 122f and 123f be a value within the range of 1: 0.5 to 1: 0.7. By doing so, the combining optical system 124
The cross-sectional shape of the combined light beam I (out) obtained through
The rectangle becomes a horizontally long rectangle having an aspect ratio in the range of 1: 1 to 1: 1.4, and substantially matches the shape of the illumination area of the liquid crystal light valve to be illuminated. As a result, the emitted combined light flux I
(Out) utilization efficiency can be improved.

FIGS. 13 and 14 show modifications of the light source device 121 described above. The light source device 131 shown in FIG. 13 differs from the light source device 121 in that a multifocal lens is arranged in order to equalize the central light amount and the peripheral light amount of the emitted light. That is, the first multifocal lens (fly-eye lens) 138a is arranged between the first rectangular exit opening 122f and the first reflector 125, and the second
A second multifocal lens 138b is arranged between the rectangular exit opening 123f and the second reflector 126, and a third multifocal lens 139 is arranged before the condenser lens 127. . Other configurations are the same as those of the light source device 121.

The light source device 141 shown in FIG. 14 has a configuration in which a polarization conversion optical system is added to the light source device 131. By arranging the polarization conversion optical system 140, the emitted light beam I (out) can be emitted as a polarized light beam having a uniform polarization direction, so that when used as a light source for a liquid crystal projector or the like, the light use efficiency is reduced. Can be enhanced.

Next, FIG. 15 shows a modification of the optical system of the two light source type light source device. Referring to this drawing, the light source device 151 includes first and second light source lamps 2.
22, 223 and these first and second light source lamps 2
A combining optical system 224 that combines the first and second emitted light beams I (22) and I (23) respectively emitted from the light beams 22 and 223 and emits a single combined light beam I (out). . In the figure, the first and second emitted light beams I
(22), I (23), and the cross-sectional shape of the combined light flux I (out) are indicated by oblique lines. The first and second light source lamps 222, 223 are arc tubes 222a, 22
3a and reflecting mirrors 222b and 223b having a curved surface shape such as an elliptical surface or a parabolic surface.

The first light source lamp 222 outputs the outgoing light flux I
(22) Emission opening 222c and first shielding reflector 22
2d, and the first shielding reflection plate 222d shields the emission opening 222c on one half with respect to one symmetry axis of the opening shape, and reflects the emitted light to be emitted from the one side portion. Things. In the illustrated example, the ejection opening 222d is circular, and in this case, the ejection opening 22d
The semicircular portion on one side of 2d is shielded, and the emitted light flux I (2
2) is fired.

The reflecting plate 222d has an uneven reflecting surface composed of a cubic-type minute reflecting plate as shown in FIG.

The second light source lamp 223 has the same configuration as the first light source lamp 222, and the emitted light flux I (2
3) Emission opening 223c and second shielding reflector 223d
The second shielding reflector 223d shields the emission opening 223c on one side half about one axis of symmetry of the opening shape, and reflects emitted light to be emitted from the one side portion. It is. In the illustrated example, the emission opening 223d is circular, and therefore, the emitted light beam I (23) having a semicircular cross section is emitted from only one semicircular emission opening 223f.

In the present invention, the emission openings 222c of the first and second light source lamps 222, 223,
223c have the same shape, and therefore, the semicircular exit openings 222f and 223f defined by the first and second shielding reflectors 222d and 223d also have the same shape. Furthermore, these semicircular injection openings 222f, 22f
3f is set to be on the same side.

The combining optical system 224 includes a first reflecting plate 225
, A second reflector 226 and a condenser lens 227
And

Next, the arrangement of the above-mentioned components will be described. First, the first and second light source lamps 222, 22
Numerals 3 are arranged facing each other such that the light source optical axes 222e and 223e are parallel to each other.
In the illustrated example, the light sources face each other such that the optical axes of the light sources coincide with each other.

The first and second light source lamps 22
Between 2 and 223, a state where the reflection surface faces the first light source lamp 222 side with the first reflection plate 225 inclined at 45 degrees on the light source optical axis 222e of the first light source lamp 222. Are located in On the other hand, on the light source optical axis 223e of the second light source lamp 223, the reflection surface is directed toward the second light source lamp in a state where the second reflection plate 226 is inclined by 45 degrees in the opposite direction. Are placed in a state.

The first and second reflecting plates 225, 2
A condenser lens 227 is arranged on the reflection direction 26, that is, on the side orthogonal to the light source optical axes 222e and 223e.

The operation and effect of the light source device 151 configured as described above will be described. First, part of the divergent light from the arc tube 222a of the first light source lamp 222 is directly reflected by the reflecting mirror 22.
2b, where it is reflected and reflected in a semi-circular exit aperture 222
Injected from f. The remaining part of the diverging light is
The diverging light path is reversed by the shielding reflector 222d that shields half of 2d, reaches the reflecting mirror 222b, is reflected there, and is emitted from the semicircular emission opening 222f. In this manner, almost all of the divergent light from the arc tube 222a is emitted as the outgoing light flux I (22) having a semicircular cross section.

Here, it is desirable that the reflecting mirror 222a be a so-called cold mirror that reflects visible light and transmits infrared light. By doing so, the reflecting mirror 222a
The reflected light from the light source becomes a visible light band, and heat generation of the light source device can be suppressed.

The outgoing light flux I (22) having a semicircular cross section emitted from the first light source lamp 222 is applied to the first reflector 225.
The light is reflected in the direction orthogonal to the light and travels toward the condenser lens 227.

On the other hand, similarly, the emitted light flux I (23) having a semicircular cross section is emitted from the second light source lamp 223, and is secondly reflected by the reflector 226 in the direction orthogonal to the condenser lens 227.

The semicircular emitted light beams I (22), I (22)
Since (23) is axisymmetric, the condenser lens 22
After being combined through the light 7, the light is emitted as a combined light flux I (out) having a single circular cross section. The shape of this combined light beam is determined by the circular emission openings 222c and 2223c of each light source lamp.
Is a shape corresponding to.

FIG. 16 shows a modification of the light source device 151. By arranging the multifocal lenses 328a, 328b and 329, the central light amount and the peripheral light amount of the emitted light beam are made uniform. Things.

Next, FIG. 17 shows still another example of the two light source type light source device. The basic components of the light source device 171 are the same as those of the light source device 151 in FIG. The difference is that the first and second light source lamps 222 and 223 are
The point is that the light source optical axes 222e and 223e are arranged so as to be orthogonal to each other, so that the second reflector 226 becomes unnecessary.

In the light source device 171 having this configuration, the outgoing light flux I of a semicircular cross section from the second light source lamp 223 is used.
(23) is a condenser lens 227 directly as it is.
, A combined light beam I (out) having a circular cross section formed by the first and second emitted light beams I (22) and I (23) is obtained via the condenser lens 227.

FIG. 18 shows a modified example of the light source device 171. This light source device 181 has a multifocal lens 328a,
By arranging 328b and 329, the central light amount and the peripheral light amount of the emitted light beam are made uniform.

[0104]

As described above, in the light source lamp and the light source device according to the present invention, a concave and convex reflecting surface composed of a cubic type minute reflecting plate is formed on a part of the light source lamp reflecting surface. Irradiated light is reflected toward the incident direction. Therefore, since the light irradiated to the reflection surface can be reliably returned to the incident side, the loss of light can be reduced, and the intensity of the emitted light can be increased.

Further, in the light source lamp and the light source device of the present invention, the light source lamp and the light source device provided with an uneven reflecting surface composed of a cubic type minute reflecting plate as a shielding reflecting plate for narrowing the emitted parallel light flux. Has adopted. Therefore,
Since the incident light can be surely returned to the light emitting point side, the light component diffused to the outside at the time of reflection on the reflecting surface can be reduced. Therefore, light use efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view, a front view, and a partially enlarged cross-sectional view of an example of a light source lamp to which the present invention is applied;

FIG. 2 is a diagram illustrating an example of a conventional light source lamp.

FIG. 3 is a sectional view and a front view showing an example of a light source lamp to which the present invention is applied.

FIG. 4 is a sectional view and a front view showing a modification of the light source lamp of FIG. 3;

FIG. 5 is a cross-sectional view and a front view showing a modification of the light source lamp of FIG. 3;

FIG. 6 is a schematic configuration diagram showing an optical system of the polarized light source device according to the first embodiment of the single light source type polarized light source device to which the present invention is applied.

FIG. 7 is a schematic configuration diagram showing an optical system of a polarized light source device according to a third embodiment of the single light source type polarized light source device to which the present invention is applied.

FIG. 8 is a schematic configuration diagram showing an optical system of a polarized light source device according to a third embodiment of the single light source type polarized light source device to which the present invention is applied.

FIG. 9 is a schematic configuration diagram showing an optical system of a two-light-source polarized light source device to which the present invention is applied.

FIG. 10 is a schematic configuration diagram showing a modified example of FIG. 9;

FIG. 11 is a schematic configuration diagram showing another example of FIG. 9;

FIG. 12 is a schematic configuration diagram showing an optical system of a two light source type light source device to which the present invention is applied.

FIG. 13 is a schematic configuration diagram showing a modified example of the light source device of FIG.

14 is a schematic configuration diagram showing another modified example of the light source device of FIG.

FIG. 15 is a schematic configuration diagram showing an optical system of another two light source type light source device to which the present invention is applied.

FIG. 16 is a schematic configuration diagram showing a modification of the light source device of FIG.

FIG. 17 is a schematic configuration diagram showing an optical system of still another two-light source type light source device to which the present invention is applied.

FIG. 18 is a schematic configuration diagram showing a modified example of the light source device of FIG.

[Explanation of symbols]

(FIGS. 1 to 5) 1 light source lamp 1a lamp optical axis 2 arc tube 2a light emitting point 3 reflecting mirror 4 curved reflecting surface 5 uneven reflecting surface 7 emission opening 8 cubic type minute reflecting plate 8a to 8c reflecting surface 35, 45 , 55 Shielding Reflector (FIGS. 6 to 8) 61 Polarized Light Source Device 62 Light Emitting Tube 63 Reflector Mirror 63a Reflecting Surface 63b Circular Emission Opening of Light Source Lamp 63c Semicircular Emission Opening Part Not Shielded by Reflector 64 Light Source Lamp Reference numeral 64a Light source optical axis 65 Polarization conversion optical system 66 Reflector 66a Reflecting surface 67 UV blocking filter 68 Polarizing beam splitter 68a Outgoing surface 611 First polarization separating film 612 Second polarization separating film 613 Quarter wave plate 614 Total reflection plate 615 Condenser lens 71 Polarized light source device 721 Reflective liquid crystal device 81 Polarized light source device 831 1 total reflection plate 832 second total reflection plate 833 波長 wavelength plate I (s) S-polarized light I (p) P-polarized light I ′ (s) S-polarized light obtained by polarization conversion Component light I (out) Emitted light flux after polarization conversion (FIGS. 9 to 11) 91, 101, 11 Polarized light source device 92 First light source lamp 93 Second light source lamp 92a, 93a Exit aperture 92b, 93b Reflector 92c, 93c Semicircular openings 92d, 93d Light source optical axis 92e, 93e Arc tube 92f, 93f Reflector 94 Polarization conversion optical system 95, 96 1/4 wavelength plate 97, 98 Polarization separation film 911, 912 Total reflection film 913 , 914 Infrared elimination filter 915 Condenser lens 116 波長 wavelength plate I (2) Emission light flux from first light source lamp I (3) Emission light flux from second light source lamp S (2) S-polarized light component of the emitted light beam of the first light source lamp P (2) P-polarized light component of the emitted light beam of the first light source lamp S (3) Of the emitted light beam of the second light source lamp S-polarized light component P (3) P-polarized light component of the light beam emitted from the second light source lamp S (2) S-polarized light component S ′ (2) of the first light source lamp emitted light beam S-polarized component light obtained by polarization conversion S ′ (3) S-polarized component light obtained by polarization conversion I (out) polarized light flux (FIGS. 12 to 18) 121, 131, 141, 151, 161, 171, 1
81 light source device 122, 222 first light source lamp 123, 223 second light source lamp 122a, 123a, 222a, 223a arc tube 122b, 123b, 222b, 223b reflecting mirror 122c, 123c, 222c, 223c emission opening 122d, 123d, 222d, 223d Shielding reflector 122e, 123e, 222e, 223e Light source optical axis 122f, 123f Rectangular exit aperture 222f, 223f Semicircular exit aperture 124, 224 Synthetic optical system 125, 126, 225, 226 Reflector 127, 227 Condenser lens 140 Polarization conversion optical system 328a, 328b, 329 Multifocal lens I (2), I (22), I (3), I (23) Outgoing light beam I (out) Composite light beam

Claims (21)

[Claims] 1. An arc tube and a reflector, the reflector having an emission opening for reflected light and a reflection surface for reflecting divergent light from the arc tube toward the emission opening. In the light source lamp, the reflecting surface includes a concave curved reflecting surface, and an uneven reflecting surface formed on an inner peripheral surface extending from an outer peripheral edge of the curved reflecting surface to the emission opening. A light source lamp characterized in that the uneven reflection surface is formed of a reflector array in which cubic type minute reflectors that reflect incident light so as to become reflected light parallel to the incident light are arranged vertically and horizontally. 2. An arc tube and a reflector, the reflector having an emission opening for reflected light and a reflection surface for reflecting divergent light from the arc tube toward the emission opening. In the light source lamp, the light source lamp has a flat shielding reflector that partially shields the emission opening, and the shielding reflector has an uneven reflection surface on a surface facing the reflection surface of the reflection mirror, The light source lamp is characterized in that the concave-convex reflecting surface is constituted by a reflector array in which cubic-type microreflectors that reflect incident light so as to become reflected light parallel to the incident light are arranged vertically and horizontally. . 3. A light source lamp comprising a light emitting tube and a reflecting mirror for reflecting divergent light from the light emitting tube toward an emission opening, and a polarization direction of light emitted from the emission opening of the light source lamp being aligned. In the polarized light source device having a polarization conversion optical system for converting light, the light source lamp shields the emission opening on one side portion around one symmetry axis of the opening shape, and an emission light component emitted from the portion. Has a reflecting plate that reflects in the opposite direction, the reflecting surface of the reflecting plate is an uneven reflecting surface,
The concave-convex reflection surface is configured of a reflector array in which cubic-type microreflectors that reflect incident light so as to become reflected light parallel to the incident light are arranged vertically and horizontally, and the polarization conversion optical system includes: , One of the P-polarized light component and the S-polarized light component included in the outgoing light emitted through the portion of the emission opening that is not shielded by the reflector, and reflects the polarized light at a right angle, and the other polarized light. A first polarization splitting film that transmits light of the component, a total reflection plate that reflects the polarized light component transmitted through the first polarization splitting film in the opposite direction, and a first polarization splitting film and the total reflection plate A 波長 wavelength plate disposed on an optical path, and a first polarization separation film disposed on the optical path between the first polarization separation film and the 波長 wavelength plate so as to be orthogonal to the first polarization separation film; The same polarization component as the polarization separation film A polarized light source device comprising: a second polarization separation film having separation characteristics. 4. The polarization conversion optical system according to claim 3, wherein the polarization conversion optical system is replaced with the ４ wavelength plate and the total reflection plate.
The light of the polarization component after passing through the second polarization separation film,
A polarized light source device comprising: a reflection type liquid crystal device that rotates its polarization direction by 90 degrees and totally reflects toward the second polarization separation film. 5. The polarization conversion optical system according to claim 3, wherein the polarization conversion optical system transmits through the first polarization separation surface instead of the second polarization separation film, the quarter-wave plate, and the total reflection plate. First and second total reflection plates that reflect the polarized component light after the reflection and emit the polarized component light reflected by the first polarization separation film in the same direction as the first total reflection plate Incident side of
Between the first and second total reflection plates or the second
か に arranged on any one of the emission sides of the total reflection plate
A polarized light source device comprising: a wave plate. 6. The polarized light source device according to claim 3, wherein light emitted from the emission opening of the light source lamp is parallel light. 7. A polarized light source device comprising: first and second light source lamps; and a polarization conversion optical system that emits a polarized light beam by aligning the polarization directions of light beams emitted from the first and second light source lamps. The first light source lamp includes an emission opening for an emitted light beam and a first reflection plate, and the first reflection plate is configured such that the emission opening has a half on one side around one symmetry axis of the opening shape. An uneven reflecting surface that shields and reflects the emitted light emitted from the one side portion in the opposite direction is provided, and the uneven reflecting surface reflects the incident light so as to be a reflected light parallel to the incident light. The second light source lamp is provided with an emission opening of an emitted light beam and a second reflection plate, and the second reflection plate is provided with a cubic type minute reflection plate arranged vertically and horizontally. The injection opening A half-sided half-shade centered on one symmetry axis of the shape is provided, and an uneven reflecting surface is provided for reflecting the emitted light emitted from the one-sided portion in the opposite direction. It is composed of a reflector array in which cubic-type micro reflectors that reflect so as to become reflected light parallel to light are arranged vertically and horizontally, and the emission openings of the first and second light source lamps have the same shape. Wherein the portions shielded by the first and second reflectors are on the same side, and the polarization conversion optical system includes first and second quarter-wave plates, A second polarization splitting film, and first and second total reflection films, wherein the first and second polarization splitting films transmit light of a specific polarization component and are polarized with respect to the polarization component. Reflects polarized light components whose directions are orthogonal to each other The first and second light source lamps are arranged in a mutually facing state so that their light source optical axes are parallel to each other. Between the first and second light source lamps, on the optical path of light emitted from the first light source lamp, the first light source lamp is provided.
Is disposed in a state of being inclined at 45 degrees with respect to the optical axis of the light source, and on the optical path of the light emitted from the second light source lamp, the second polarization separation film is inclined at 45 degrees in the opposite direction. The first total reflection film is located on the optical axis of the light source on the optical path of the light emitted from the first light source lamp between the first and second polarization separation films. The second light source lamp faces the first light source lamp in a vertical state, and the second total reflection film is on the optical path of light emitted from the second light source lamp in a state perpendicular to the optical axis of the light source. The first quarter-wave plate is disposed on an optical path between the first light source lamp and the first polarization splitting film so as to be perpendicular to the optical axis of the light source. The second quarter-wave plate is provided on the optical path between the second light source lamp and the second polarization separation film. Polarized light source apparatus characterized by being arranged in a vertical state. 8. The method according to claim 7, wherein
Wherein the light source lamps are arranged such that their light source optical axes coincide with each other. 9. A polarized light source device comprising: first and second light source lamps; and a polarization conversion optical system that emits polarized light beams by aligning the polarization directions of the light beams emitted from the first and second light source lamps. The first light source lamp includes an emission opening for an emitted light beam and a first reflection plate, and the first reflection plate is configured such that the emission opening has a half on one side around one symmetry axis of the opening shape. An uneven reflecting surface that shields and reflects the emitted light emitted from the one side portion in the opposite direction is provided, and the uneven reflecting surface reflects the incident light so as to be a reflected light parallel to the incident light. The second light source lamp is provided with an emission opening of an emitted light beam and a second reflection plate, and the second reflection plate is provided with a cubic type minute reflection plate arranged vertically and horizontally. The injection opening A half-sided half-shade centered on one symmetry axis of the shape is provided, and an uneven reflecting surface is provided for reflecting the emitted light emitted from the one-sided portion in the opposite direction. It is composed of a reflector array in which cubic-type micro reflectors that reflect so as to become reflected light parallel to light are arranged vertically and horizontally, and the emission openings of the first and second light source lamps have the same shape. Wherein the portions shielded by the first and second reflectors are on the same side, and the polarization conversion optical system includes first and second quarter-wave plates, A second polarization separation film, wherein the first and second polarization separation films transmit light of a specific polarization component and reflect light of a polarization component whose polarization direction is orthogonal to the polarization component. The same polarization separation feature set as Wherein the first and second light source lamps are arranged so as to face each other so that their light source optical axes coincide with each other, and between the first and second light source lamps. On the light path of
The first polarized light separating film is disposed in a state of being inclined by 45 degrees with respect to the optical axis of the light source, and the second polarized light separating film is disposed at
The first 波長 wavelength plate is arranged in a state of being inclined by 5 degrees, and the first quarter-wave plate is perpendicular to the optical axis of the light source on the optical path between the first light source lamp and the first polarization splitting film. On the optical path between the second light source lamp and the second polarization splitting film, the second quarter-wave plate is arranged perpendicular to the light source optical axis. Characterized polarized light source device. 10. A polarized light source device comprising: first and second light source lamps; and a polarization conversion optical system that emits a polarized light beam by aligning the polarization directions of light beams emitted from the first and second light source lamps. The first light source lamp includes an emission opening for an emitted light beam and a first reflection plate, and the first reflection plate is configured such that the emission opening has a half on one side around one symmetry axis of the opening shape. An uneven reflecting surface that shields and reflects the emitted light emitted from the one side portion in the opposite direction is provided, and the uneven reflecting surface reflects the incident light so as to be a reflected light parallel to the incident light. The second light source lamp is provided with an emission opening of an emitted light beam and a second reflection plate, and the second reflection plate is provided with a cubic type minute reflection plate arranged vertically and horizontally. The injection opening It has an uneven reflection surface that shields half of one side around the axis of symmetry of the mouth shape and reflects the emitted light emitted from the one side portion in the opposite direction, and the uneven reflection surface reflects the incident light. It is composed of a reflector array in which cubic type minute reflectors that reflect so as to become reflected light parallel to the incident light are arranged vertically and horizontally, and the emission openings of the first and second light source lamps are the same. The first and second reflectors are the same side, and the polarization conversion optical system includes first and second quarter-wave plates, And a second polarization separation film, first and second total reflection films, and a half-wave plate, wherein the first and second polarization separation films transmit light of a specific polarization component. A polarization component whose polarization direction is orthogonal to the polarization component The first and second light source lamps are arranged so that the light source optical axes are orthogonal to each other; and the first and second light source lamps are arranged so as to be orthogonal to each other. Among the light source lamps, the first light source lamp has an optical path on the optical path of light emitted from the first light source lamp.
Is disposed in a state of being inclined by 45 degrees with respect to the optical axis of the light source, and on the optical path of the light emitted from the second light source lamp, the second polarization separation film is provided with the first polarization separation film. It is arranged in a state of being inclined 45 degrees in a direction opposite to the direction of inclination of the film, and between the first and second polarization separation films, on the optical path of the light emitted from the first light source lamp, The first total reflection film is opposed to the first light source lamp in a state where the first total reflection film is perpendicular to the optical axis of the light source, and the second total reflection film is provided on an optical path of light emitted from the second light source lamp. The first light source lamp is opposed to the second polarization splitting film in a state parallel to the optical axis of the light source, and the first 1/1/1 is placed on the optical path between the first light source lamp and the first polarization splitting film. A four-wavelength plate is disposed perpendicular to the optical axis of the light source, and on a light path between the second light source lamp and the second polarization separation film. The second quarter-wave plate is disposed in a state perpendicular to the optical axis of the light source, and the second quarter-wave plate is arranged in a direction along the optical axis of the second light source lamp with respect to the second polarization separation film. On the optical path on the rear side, 1 /
A polarized light source device, wherein a two-wavelength plate faces the second polarized light separating film in a state perpendicular to a light source optical axis of the second light source lamp. 11. The polarized light according to claim 10, wherein the first and second polarized light separating films are set so that the polarized light separating characteristics have opposite characteristics, and the half-wave plate is omitted. Light source device. 12. The method according to claim 7, further comprising a first and a second infrared light removing filter, wherein the first infrared light removing filter emits the first light source lamp. Disposed between the aperture and the first quarter-wave plate;
The polarized light source device, wherein the second infrared filter is disposed between an emission opening of the second light source lamp and the second quarter-wave plate. 13. The lamp according to claim 7, wherein each of the first and second light source lamps includes an arc tube and a reflecting mirror that reflects divergent light from the arc tube. A polarized light source device, wherein the reflecting mirror is an infrared transmitting cold mirror. 14. A first light source lamp, a second light source lamp, a first light beam emitted from the first light source lamp, and the second light source lamp.
And a combining optical system that combines the second emitted light beams from the light source lamps and emits the combined light beams as a combined light beam. An opening, and a first shielding reflector, the first shielding reflector shielding an outer peripheral portion of the first emission opening to form a first rectangular emission center centered on a light source optical axis. An opening is formed, the second light source lamp includes a second emission opening from which the second emitted light beam is emitted, and a second shielding reflector, and the second shielding reflector is provided. Forms a second rectangular exit opening centered on the optical axis of the light source by blocking an outer peripheral portion of the second exit opening, and the first and second rectangular exit openings have the same shape. The first and second shielding reflectors include an uneven reflecting surface, and the uneven reflecting surface is provided. Is composed of a reflector array in which cubic-type microreflectors that reflect incident light so as to become reflected light parallel to the incident light are arranged vertically and horizontally, and the synthetic optical system includes a first and a second optical system. And a condenser lens, wherein the first and second light source lamps are arranged in a mutually facing state so that their light source optical axes are parallel to each other. Between the second light source lamps, on the light source optical axis of the first light source lamp, the first reflection plate is disposed so as to face the light source optical axis of the second light source lamp in a state of being inclined by 45 degrees. On the upper side, the second reflection plate is disposed so as to face in a direction inclined at 45 degrees in the opposite direction, and the first and second emission lights reflected by the first and second reflection plates are disposed on the condenser. Single rectangle through lens A light source device, which is emitted as a combined light beam of a cross section. 15. An apparatus according to claim 14, wherein an aspect ratio of said first and second rectangular openings is from 1: 0.5 to 1:
A light source device having a value within a range of 0.7. 16. The light source according to claim 14, wherein a distance from a light emitting point of the arc tube of each of the first and second light source lamps to a reflecting surface of the reflecting mirror when measured in a direction perpendicular to the optical axis of the light source. A light source device, wherein the length of the first and second rectangular exit openings in the short side direction is set to be twice as large as the distance. 17. The polarized light source according to claim 14, wherein the first and second light source lamps are arranged so that the respective light source optical axes coincide with each other. apparatus. 18. A first light source lamp, a second light source lamp, a first light beam emitted from the first light source lamp and the second light source lamp.
A light source device that combines the second emitted light beams from the light source lamps and emits the combined light beams as a combined light beam, wherein the first light source lamp has a first emission opening from which the first emitted light beam is emitted; A shielding reflector, wherein the first shielding reflector shields the first exit opening on one side half with respect to one symmetry axis of the opening shape, and the second light source lamp comprises: A second exit opening from which the second exit light beam exits; and a second shielding / reflecting plate. The second shielding / reflecting plate connects the second exit opening to one of the symmetry axes of the opening shape. The emission opening of each of the first and second light source lamps has the same shape, and the portion shielded by the first and second shielding reflectors is On the same side, for the first and second shielding Each of the reflection plates has an uneven reflection surface, and the uneven reflection surface is a reflection plate in which cubic type minute reflection plates that reflect incident light so as to be reflected light parallel to the incident light are arranged vertically and horizontally. An array, wherein the composite optical system includes a first reflector, a second reflector,
A condenser lens, wherein the first and second light source lamps are arranged so as to face each other such that their light source optical axes are parallel to each other. Between the first light source lamps on the optical path of the light emitted from the first light source lamp.
Reflectors are disposed opposite to each other in a state of being inclined at 45 degrees with respect to the optical axis of the light source, and on the optical path of light emitted from the second light source lamp, the second reflector is inclined at 45 degrees in the opposite direction. The first and second light reflected by the first and second reflectors are emitted as a combined light beam through the condenser lens. Light source device. 19. The light source device according to claim 18, wherein the first and second light source lamps are arranged such that their light source optical axes coincide with each other. 20. First and second light source lamps, a first luminous flux from the first light source lamp, and the second light source lamp.
A light source device that combines the second emitted light beams from the light source lamps and emits the combined light beams as a combined light beam, wherein the first light source lamp has a first emission opening from which the first emitted light beam is emitted; A shielding reflector, wherein the first shielding reflector shields the first exit opening on one side half with respect to one symmetry axis of the opening shape, and the second light source lamp comprises: A second exit opening from which the second exit light beam exits; and a second shielding / reflecting plate. The second shielding / reflecting plate connects the second exit opening to one of the symmetry axes of the opening shape. The emission opening of each of the first and second light source lamps has the same shape, and the portion shielded by the first and second shielding reflectors is On the same side, for the first and second shielding Each of the reflection plates has an uneven reflection surface, and the uneven reflection surface is a reflection plate in which cubic type minute reflection plates that reflect incident light so as to be reflected light parallel to the incident light are arranged vertically and horizontally. Wherein the first and second light source lamps are arranged so that light source optical axes are orthogonal to each other; On the optical path of the first outgoing light from the light source lamp, the reflecting plate is disposed so as to face the optical axis of the light source at an angle of 45 degrees, and the first outgoing light reflected by the reflecting plate And a second emission light emitted from the second emission opening of the second light source lamp is emitted as a combined light beam through the condenser lens. 21. The light source device according to claim 14, wherein the reflecting mirrors of the first and second light source lamps are infrared transmitting cold mirrors.