JP2000347131A - Illuminating optical system and projecting type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an illuminating optical device for enhancing the utilization of light without increasing a concentration angle to an illuminated area of a liquid crystal panel and the like. SOLUTION: The illuminating optical device consists of a light reflecting means 3 for reflecting a luminous flux emitted from a light source 1, a 1st lens array 20 composed of plural lenses 11 which are two-dimensionally arranged in front of the light reflecting means 3, except the vicinity of the optical axis 9 of the light source, and a 2nd lens array 21 composed of plural lenses 21 which are two-dimensionally arranged at the focal positions of respective lenses of the lens array 20, and by constituting the device so that the lens 20 is not arranged near the optical axis 9, a part near the optical axis 9 where the luminous flux emitted from the light source 1 is weak is prevented from being put to use, then, the opening dimension of the lens 16 near the optical axis of the 2nd lens array 21 is made larger without enlarging the area of the 2nd lens array 21. Thus, the utilization of the light from the light source 1 is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an illumination optical device and a projection display device.

[0002]

2. Description of the Related Art Conventionally, as one method of displaying a large-screen image, a projection display device using a light valve has been known. In recent years, a projection type display device using a liquid crystal panel as this light valve has been put to practical use.

[0003] Such a projection display device requires an illumination optical device for illuminating an image displayed on the light valve with strong light, and the performance of the illumination optical device greatly affects the projection image quality. For example, an illumination optical device which is excellent in color reproducibility, highly efficient and bright, and has good uniformity of the brightness is required as a projection display device.

As an example of a conventional illumination optical device, a concave mirror type illumination optical device using a concave mirror will be described with reference to FIG.

In FIG. 5, reference numeral 1 denotes a lamp.
Is an illumination light source, and a white light light source such as a xenon lamp, a halogen lamp, and a metal high halide lamp is used as the lamp 1. 2 is a light emitting portion of the lamp 1, 3
Is a concave mirror having an opening 3A. As the concave mirror 3, a parabolic mirror, an elliptical mirror or the like is used. The dashed line 9 indicates the optical axis of a single light beam emitted from the concave mirror 3.

This concave mirror type illumination optical device comprises a lamp 1,
It comprises a concave mirror 3, a first lens array plate 4, a second lens array plate 5, a condenser lens 6, and a liquid crystal panel 7 serving as a light valve.

The first lens array plate 4 is arranged at a position in front of the opening 3A of the concave mirror 3, and the second lens array plate 5 is located on the opposite side of the first lens array plate 4 from the concave mirror 3 side. The condenser lens 6 is disposed at a predetermined distance from the first lens array plate 4 at a position, and the condenser lens 6 is located close to the second lens array plate 5 at a position opposite to the first lens array plate 5 side. The liquid crystal panel 7 is disposed on the second lens array plate 5.
The condenser lens 6 is disposed in the illuminated area at a predetermined distance from the condenser lens 6 on the opposite side.

In this arrangement, the central axes of the first lens array plate 4, the second lens array plate 5, the condenser lens 6 and the liquid crystal panel 7 are indicated by the one-dot chain line 9. 9 is performed in a state where it is matched.

The first lens array plate 4 has a total of 36 lenses 10 in the vertical and horizontal directions with each of the plurality of first lenses 10 facing the concave mirror 3.
Are arrayed two-dimensionally, and the second lens array plate 5 has a total of 36 lenses in each of the vertical and horizontal directions with each of the plurality of second lenses 15 facing the condenser lens 6. It is configured by arranging two lenses 10 two-dimensionally.

That is, the number of the plurality of first lenses 10 and the number of the plurality of second lenses 15 are the same, and the number of arrangements in the vertical direction and the number of arrangements in the horizontal direction are the same.
The first lens array plate 4 and the second lens array plate 5 are arranged in a two-dimensional manner in a state where 0 and a plurality of second lenses 15 have the same number.

Next, illumination by the concave mirror type illumination optical device will be described.

A single light beam emitted from the concave mirror 3 and incident on the first lens array plate 4 is divided into a plurality of partial light beams of the same number as the plurality of first lenses 10, and the light beams emitted from each of these lenses 10 are divided. The luminous flux is separately incident on each of the plurality of second lenses 15 for each of the divided partial luminous fluxes, and forms a real image of the light emitting unit 2 by focusing on each of the plurality of second lenses 15. I do.

Each of the focused light fluxes of the real image of the light emitting section 2 is emitted from a plurality of lenses 15 and made incident on a condenser lens 6, emitted through the condenser lens 6, and emitted from the plurality of second lenses 15. Each of the partial luminous fluxes emitted from each illuminates the entire surface of the liquid crystal panel 7 disposed in the illuminated area, and illuminates with uniform brightness over the entire surface of the liquid crystal panel 7.

However, in the concave mirror type illumination optical device shown in FIG. 5, the light intensity distribution of a single light beam emitted from the concave mirror 3 is not uniform as shown in FIG. 6B. In FIG. 6, an arrow 12 indicates a separation distance from a direction orthogonal to the optical axis 9, an arrow 13 indicates light intensity, and a curve 1
3 represents the light intensity distribution.

That is, in this light intensity distribution, the light intensity sharply decreases around the optical axis 9 as shown by the curve 13A, and the light intensity sharply increases at a portion slightly away from the optical axis 9 in the direction shown by the arrow 12. And the light intensity gradually decreases as it approaches the periphery of the opening 3A of the concave mirror 3, resulting in a non-uniform light intensity distribution state.

The reason why the light intensity of the single luminous flux emitted from the concave mirror 3 becomes such a non-uniform distribution state is that the opening 3B for mounting the lamp 1 in the concave mirror 3 is formed by the concave mirror 3
It is considered that the light emitting portion 2 of the lamp 1 is located at a position higher than the bottom portion and the light distribution of the light emitting portion 2.

Next, when the light intensity of the single light beam emitted from the concave mirror 3 exhibits such a non-uniform distribution state, each of the single light beams focused on each of the plurality of lenses 15 is adjusted. The light intensity distribution state will be described with reference to FIGS. 7A and 7B.

When the light intensity distribution of the single light beam emitted from the concave mirror 3 is in such a non-uniform distribution state,
The intensity of a single light beam incident on each of the plurality of first lenses 10 differs depending on each of the plurality of first lenses 10.

That is, the plurality of first lenses 10 are arranged as shown in FIG.
A, a lens group arranged in an area where a strong single light beam indicated by a colored ring-shaped area 4A is incident, and a single lens relatively weaker than the strong single light beam indicated by a colorless ring-shaped area 4B. The lens group is divided into a lens group arranged in an area where a light beam enters and a lens group arranged in an area where a single light beam having a relatively lower light intensity indicated by a colorless ring-shaped area 4C is incident.

Therefore, in a state where the light intensity distribution is uneven, the partial light beams from each of the plurality of first lenses 10 are focused, and the light emitting portion 2 of the lamp 1 is focused.
As shown in FIG. 7B, each of the plurality of second lenses 15 on which the real images are formed has a lens portion a in which a partial light beam having a relatively high light intensity is focused, and a light portion having a light intensity A lens portion b in which a partial light beam relatively weaker than the lens portion a is focused, and a lens portion c in which a partial light beam whose light intensity is relatively weaker than the lens portion b are focused.

[0021]

In the conventional concave mirror type illumination optical device, if a real image larger than the opening of the plurality of second lenses 15 is formed on the liquid crystal panel 7, it is effective. 7B, a light beam which is not transmitted is generated, and a light loss is caused. In particular, this light loss is caused in each of the lens portions a of the plurality of second lenses 15 shown in FIG. When this occurs, there is a problem that the light utilization factor in the illumination optical device is greatly reduced, and solving this problem has been an issue.

However, if the size of the light emitting portion 2 is reduced to solve the problem and the size of the real image is further reduced, there is a problem that the life of the light emitting portion 2 is shortened.

It is conceivable to increase the aperture size of each of the plurality of second lenses 15 to increase the aperture area in order to improve the light utilization factor. In this case, however, the second lens array is required. Since the entire area of the plate 5 is increased, the concentration angle of the entire light beam entering the liquid crystal panel 7 from the second lens array plate 5 is increased, and as a result, the divergence angle of the light beam emitted from the liquid crystal panel 7 is increased. Therefore, a projection lens having a bright F number is required as the projection lens.

However, the projection lens having a bright F-number has a problem that the effective lens diameter becomes large and it is difficult to construct a compact projection display device, and the cost of this lens rises. When the size is increased, there is a problem that the contrast of a display screen obtained by projecting a light beam entering and exiting the liquid crystal panel onto a screen is reduced.

The present invention has been made in view of the above points,
A main object of the present invention is to provide an illumination optical device and a projection display device which solve the problem that the light utilization rate is reduced in a state where these problems do not occur.

[0026]

SUMMARY OF THE INVENTION An illumination optical device according to the present invention comprises a light source means, a light reflection means for reflecting a light beam of the light source means in one direction, and an optical axis of the light source means on a front surface of the light reflection means. A first lens array means composed of a plurality of lenses having substantially the same aperture dimension and arranged two-dimensionally except for the vicinity of the first lens array means; A second lens array means comprising a plurality of lenses arranged two-dimensionally and having apertures of a plurality of lenses arranged near the optical axis larger than the apertures of the other lenses; and The second lens array means is provided on the side opposite to the first lens array means with respect to the second lens array means and opposed to the second lens array means. Profit Condenser lens means for superimposing each of the light beams of the light source means on the illuminated area, and focuses the individual focal points of the plurality of lenses constituting the first lens array means on the first lens array means. This second lens which faces a plurality of lenses constituting
The lens array means is individually connected to a plurality of lenses to solve the problem that the light utilization factor in the illumination optical device is reduced.

The projection type display apparatus according to the present invention also comprises a light source means, a light reflecting means for reflecting a light beam of the light source means in one direction, and a front surface of the light reflecting means except for the vicinity of the optical axis of the light source means. First lens array means comprising a plurality of lenses having substantially the same aperture dimensions arranged two-dimensionally, and two-dimensionally arranged about the optical axis at a predetermined distance from the first lens array means. And a second lens array comprising a plurality of lenses arranged such that the apertures of a plurality of lenses arranged near the optical axis are larger than the apertures of the other lenses, and the second lens array. The light source provided on the opposite side of the first lens array means to the second lens array means with respect to the means and obtained from each of the plurality of lenses of the second lens array means; Condenser lens means for superimposing each of the luminous fluxes on the illuminated area, light valve means provided in the illuminated area, and projection optical means for enlarging and projecting the luminous flux emitted from the light valve means. A screen means for transmitting and reflecting or diffusing the light beam enlarged and projected by the projection optical means, to shift the individual focal points of the plurality of lenses constituting the first lens array means to the first lens array. It is possible to solve the problem that the light utilization rate in the projection type display device is reduced by individually connecting to the plurality of lenses constituting the second lens array means which face each of the plurality of lenses constituting the means. It is like that.

Further, the projection type display device according to the present invention comprises a light source means for generating a light beam including at least three primary colors, a light reflecting means for reflecting the light beam of the light source means in one direction, and a light reflecting means provided on the front surface of the light reflecting means. 2 except for the vicinity of the optical axis of the light source means
First lens array means comprising a plurality of lenses having substantially the same aperture dimension arranged in a two-dimensional manner, and two-dimensionally arranged about the optical axis at a predetermined distance from the first lens array means A second lens array means comprising a plurality of lenses in which the aperture dimensions of the plurality of lenses arranged near the optical axis are larger than the aperture dimensions of the other lenses; and A condenser provided on the side opposite to the first lens array means with respect to the second lens array means so that each of the light beams of the light source means obtained from each of the plurality of lenses is superimposed on the illuminated area. A lens unit, a color separation unit that separates the light beam emitted from the condenser lens unit into a plurality of color light beams, and a color light beam provided in the illuminated area and separated by the color separation unit. A plurality of light valve means which are separately incident for each color light beam, a color synthesizing means for synthesizing each of the plurality of color light beams emitted from each of the plurality of light valve means, and a light beam synthesized by the color synthesizing means. Projection optical means for magnifying and projecting, and screen means for transmitting and reflecting or diffusing the light beam magnified and projected by the projection optical means, and individual focal points of the plurality of lenses constituting the first lens array means Are individually connected to a plurality of lenses constituting the second lens array means which are opposed to a plurality of lenses constituting the first lens array means, respectively, so that the light utilization rate in the projection display device is reduced. It is intended to solve the problem.

The illumination optical apparatus according to the present invention also includes a light source means, a light reflection means for reflecting the light beam of the light source means in one direction, and a front surface of the light reflection means except for the vicinity of the optical axis of the light source means. First lens array means comprising a plurality of lenses having substantially the same aperture size arranged two-dimensionally;
A plurality of lenses having substantially the same aperture size as the number of lenses constituting the first lens array means are arranged at a position spaced apart from the first lens array means by a predetermined distance. A second lens array means arranged two-dimensionally as a center, and facing the second lens array means on a side opposite to the first lens array means with respect to the second lens array means. By means of the condenser lens means provided, the individual focal points of the plurality of lenses constituting the first lens array means are respectively opposed to the plurality of lenses constituting the first lens array means. The lens array means is individually connected to a plurality of lenses to solve the problem that the light utilization rate in the projection display device is reduced.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example of an embodiment of the present invention will be described by giving the same reference numerals to the same parts as in FIGS. 5, 6A, B, 7A and B, and omitting detailed description. Description will be given based on the attached drawings.

FIG. 1 is a block diagram showing an essential part of an example of a projection type display device according to the present invention. The projection type display device includes a lamp 1, a concave mirror 3, a condenser lens 6, a liquid crystal panel 7, a plurality of The first lens array plate 20 in which the first lenses 11 are two-dimensionally arranged, and the plurality of second lenses 16
A second lens array plate 21, another condenser lens 22, a projection lens unit 23, and a liquid crystal driving unit 24 arranged in a dimensional manner are provided.

In this case, the lamp 1, the concave mirror 3,
A first lens array plate 20 in which a plurality of first lenses 11 are arranged two-dimensionally, a second lens array plate 21 in which a plurality of second lenses 16 are arranged two-dimensionally, and a condenser lens 6 It constitutes an illumination optical device.

In this projection type display device, as shown by a broken line in FIG.
Is divided into the same number of partial light beams as the plurality of first lenses 11 by each of the plurality of first lenses 11.

As shown by the broken lines in FIG. 1, a plurality of second lenses arranged two-dimensionally in a state facing each of the plurality of first lenses 11 arranged two-dimensionally. 16, a single light beam is incident from the first lens 11 to the second lens 16 arranged at the same arrangement position as the arrangement position of the plurality of first lenses 11, Of the light emitting unit 2 is formed on each of the plurality of second lenses 16.

Further, as shown by the broken line in FIG. 1, the real image of the light emitting section 2 thus formed on each of the plurality of second lenses 16 is transferred from each of the plurality of second lenses 16 to the condenser lens. 6 and other condenser lenses 22
The liquid crystal panel 7 arranged in this illuminated area through
Illuminate the whole area of

The illumination light is emitted from the liquid crystal panel 7 in a state where the transmittance of the illumination light of the liquid crystal panel 7 illuminated in this way is controlled by the video signal from the liquid crystal drive unit 24, and the projection lens The illumination light is enlarged and projected on a screen 25 that is incident on the unit 23 and transmitted or diffused or reflected and diffused from the projection lens unit 23, and an image based on the image signal from the liquid crystal drive unit 24 is displayed on the screen 25. I have.

In the example shown in FIG. 1, the concave mirror 3
Is converted into a partial light beam by each of the plurality of first lenses 11, and this partial light beam obtained by each of the plurality of first lenses 11 is converted into a plurality of first lenses 11.
A plurality of second lenses 1 arranged to face each other
6 so as to individually enter the first lens 1.
The first and second lenses 16 are arranged, and each of the plurality of second lenses 16 illuminates the entire surface of the liquid crystal panel 7 disposed in this illuminated area through the condenser lens 6 and another condenser lens 22. Have to be able to.

However, in FIG. 1, in order to avoid complicating the drawing, this optical system is shown by broken lines only for two of the plurality of first lenses 11 and the other first lenses 11 are shown. The broken lines indicating the respective optical systems of the lenses 11 are omitted.

Next, an example according to the present invention of the first lens array plate 20 used in the illumination optical device shown and described in FIG. 1 is shown in FIG. 2A, and the same parts as those in FIG. The explanation will be omitted here.

In FIG. 2A, six rows of lenses 11 are successively arranged vertically in the first, second, fifth, and sixth rows from the left side, respectively. The lenses 11 are arranged only at the first, second, fifth, and sixth stages from the bottom, and the lenses 11 are arranged at the third and fourth stages from the bottom of the six stages.
By arranging the lenses 11 in a state where the lenses 11 are not arranged, the lenses 11 are not arranged near the optical axis 9 and the lenses 11 are
The first lens array plate 20 is arranged in a six-dimensional array.
Is composed.

Each of these lenses 11 is constituted by lenses having substantially the same aperture size.

Next, the distribution of light intensity in the opening 3A as viewed from the first lens array plate 20 will be described with reference to FIG. 2A.

An area 4A indicated by a colored ring in FIG. 2A is an area where a single luminous flux of a portion having a high light intensity near the peak value of the curve 13A in FIG. 6 is incident on the first lens array plate 20. And a colorless ring-shaped area 4B indicates an area where a single light beam of a portion gradually decreasing from the peak value is incident on the first lens array plate 20, and is a colorless ring-shaped area. 4C
Indicates an area where the single light flux of the portion where the light intensity shown by the curve 13A sharply drops near the optical axis 9 is incident on the first lens array plate 20.

In FIG. 2A, a plurality of lenses 11 are arranged two-dimensionally in a state where the lenses 11 are not arranged at the third and fourth rows from the bottom in the third and fourth rows from the left, respectively. Of the lens array plate 20 of area 4
Even if the single light beam incident from C is not used,
A single light beam from the area 4A and the area 4B can be sufficiently incident by the plurality of lenses 11 arranged two-dimensionally, so that the total light amount of the entire single light beam incident on the first lens array plate 20 Hardly decreases.

Next, FIG. 2B shows an example according to the present invention of the second lens array plate 21 used in the illumination optical device described with reference to FIG. 1, and the same parts as those in FIG. The explanation will be omitted here.

One column from the left indicated by a and b in FIG.
In each of the second, fifth, and sixth rows, lenses 16 having substantially the same aperture size are arranged in a vertically stacked state in six stages.

As shown by b1, b2, b3, and b4 in FIG. 2B, the first, second, fifth, and third rows in the third and fourth rows from the left in FIG. 2B respectively. The lenses 16 having an aperture size larger than the lenses 16 arranged in the sixth row are arranged.

As shown by a1, a2, a3a, and a4 in FIG. 2B, the lenses 16 shown by b1, b2, b3, and b4 in the second and third rows of the third and fourth rows, respectively. The second lens array plate 21 is configured by arranging the lenses 16 having an aperture size even larger than that.

In this case, however, the lenses 16 indicated by b1, a1, a3 and b3 are arranged in a vertically stacked arrangement in four stages.
And the lens 16 indicated by b2, a2, a4 and b4
Are vertically arranged in four rows, and the height in the vertical direction is the height of the first, second, fifth, and sixth rows in which the lenses 16 indicated by a and b are vertically stacked in six rows. The aperture dimensions of the lenses indicated by a1 to a4 and b1 to b4 are selected so as to have the same height.

Next, a first lens array plate 20 having the configuration shown in FIG. 2A is used as the first lens array plate 20 of the illumination optical device shown in FIG. The case where the second lens array plate 21 having the configuration shown in FIG. 2B is used as the second lens array plate 21 of the illumination optical device shown and described will be described with reference to FIGS. 2A and 2B. .

The focal point of the first stage lens 11 in the first row of the first lens array plate 20 is
The first lens array plate 20 is connected to the first-stage lens 16 of the first lens array plate 20.
Is focused on the lens 16 in the first row of the second lens array plate 21 and the focal point of the lens 11 in the second row of the array plate 20 is The focal point of the lens 11 in the second row of the array plate 20 is focused on the lens 16 in the second row of the array plate 21. The lens 16 is tied.

The focal point of the first-stage lens 11 of the fifth row of the array plate 20 is focused on the first-stage lens 16 of the fifth row of the array plate 21. The focus of the lens 11 of the sixth row of the array plate 21 is focused on the lens 16 of the sixth row of the fifth row of the array plate 20. This array plate 21
The focal point of the sixth stage lens 11 of the sixth row of the array plate 20 is focused on the sixth stage of the sixth row of the array plate 21. The eye lens 16 is tied.

The focus of the first-stage lens 11 in the third row of the first lens array plate 20 is shifted to the second lens array plate 21.
And the focal point of the lens 11 in the third row of the third row of the array plate 20 is shifted to the fourth row in the third row of the second lens array board 21. The first lens 11 in the fourth row of the array plate 20 is connected to the lens 16.
Is focused on the first-stage lens 16 in the fourth row of the second lens array plate 21, and the focal point of the sixth-stage lens 11 in the fourth row of the array plate 20 is focused on the second lens array. It is connected to the lens 16 in the fourth row of the fourth row of the plate 21.

The focus of the second-stage lens 11 in the third row of the first lens array plate 20 is focused on the second-stage lens 16 in the third row of the second lens array plate 21. The focal point of the fifth lens 11 in the third row of the plate 20 is set to the third lens 11 in the third row of the second lens array plate 21.
6, the focus of the second stage lens 11 in the fourth row of the array plate 20 is focused on the second stage lens 16 in the fourth row of the second lens array plate 21.
The focus of the fourth stage fifth stage lens 11 is focused on the fourth stage third stage lens 16 of the second lens array plate 21.

By focusing in this manner, the first lens array plate 20 is moved from left to right in FIG. 2A.
Each of the partial luminous fluxes from the first to sixth rows in the second, fifth, and sixth rows is respectively placed in the first, second, and fifth rows from the left side of the second lens array plate 21 in FIG. 2B. A real image can be formed by individually focusing each of the first to sixth stage lenses 16 in the sixth row.

Further, in FIG. 2A, a single luminous flux having a high light intensity incident from the area 4A to each of the first and sixth stage lenses 11 in the third and fourth rows from the left side, respectively.
In FIG. 2B, a real image can be formed by individually focusing on the lenses 16 having large aperture dimensions indicated by b1 to b4.

Further, in FIG. 2A, the lenses 1 in the second and fifth stages of the third and fourth columns from the left, respectively.
Forming a real image by individually focusing single luminous fluxes having high light intensity incident from the area 4A on the lenses 16 having larger aperture dimensions indicated by a1 to a4 in FIG. 2B. Can be.

Therefore, the first lens array plate 20 shown in FIG. 2A is used as the first lens array plate 20 of the illumination optical device shown in FIG. By using the second lens array plate 21 shown and described in FIG. 2B as the second lens array plate 21 of the illumination optical device, the second lens array plate 2
The light utilization rate of the illumination optical device can be improved without increasing the entire area of the first lens array than the area of the second lens array plate 5.

Next, FIG. 3 shows an example of another embodiment of the plurality of first lenses 11 constituting the first lens array plate 20 according to the present invention, which is the same as FIGS. 1, 2A and 2B. The same reference numerals are given to the portions described below, and detailed description is omitted.

In the example shown in FIG. 3, the lenses 11 are arranged in one row horizontally from left to right,... First in
The second, fifth, and sixth rows have lenses 11 vertically
They are arranged in a stack.

The lenses 101, 1 arranged in the third row
03 and 105, lenses 102, 1 arranged in the fourth row
The lenses 107, 109 and 111, which are arranged in the third row, are arranged in three rows at positions shifted in a direction away from the optical axis 9 as shown in FIG. Each of the lenses 108, 110, and 112 arranged in a row is vertically stacked in three stages at a position moved downward in a direction away from the optical axis 9 as shown in FIG. Constitutes the first lens array plate 20 in a state where the first lenses 11 are not arranged.

As shown in FIG. 3, each of these movement amounts is within the range in the height direction of the lens 11 alone. Further, each of the plurality of lenses 11 constituting the first lens array plate 20 is constituted by a lens having substantially the same aperture size.

The plurality of first lenses 1 arranged two-dimensionally to form the lens array plate 20
The focal points of the partial luminous fluxes emitted from each of the lens array plates are arranged two-dimensionally by stacking 36 lenses of 36 lenses having substantially the same aperture size in six rows in the horizontal direction and six steps in the vertical direction. The lens 21 is individually connected to a corresponding one of the plurality of lenses.

Therefore, the lenses 101 to 106 and 107 to 112 of the plurality of first lenses 11 are two-dimensionally arranged at the positions described with reference to FIG. To 110 can be arranged in a convenient position for a single light beam having a high light intensity from this area 4A to enter, and each of the lenses 101, 102, 111 and 112 can be arranged from this area 4B. It can be arranged at a position convenient for one light beam to enter.

Therefore, by using the first lens array plate 20 shown in FIG. 3 as the first lens array plate 20 shown in FIG. 1, the opening shape of the opening 3A of the concave mirror 3 is circular. By effectively utilizing the above, the light utilization rate of the illumination optical device can be improved.

Next, the light transmission state of the illumination optical device described with reference to FIGS. 1 and 2A and 2B or the illumination optical device described with reference to FIGS. 1 and 3 is controlled by a red image signal. A projection type display device that generates projection light of a color image by combining a liquid crystal panel 37, a liquid crystal panel 38 whose light transmission state is controlled by a green image signal, and a liquid crystal panel 39 whose light transmission state is controlled by a blue image signal FIG. 1 and FIG. 2 show an example of an embodiment of the present invention when
The same reference numerals are given to the same parts as A, B, and FIG. 3, and detailed description is omitted.

In the following description, a red image signal is called an R signal, a green image signal is called a G signal, and a blue image signal is called a B signal.

This projection type display apparatus has a lamp 1, a concave mirror 3, a first lens array plate 20 composed of a plurality of first lenses 11 arranged two-dimensionally, a condenser lens 6,
A second lens array plate 21 including a plurality of second lenses 16 arranged two-dimensionally, a cold mirror 30, an ultraviolet / infrared cut filter (hereinafter referred to as a UV / IR filter) 31, a color separation dichroic Mira 3
2, 33; condenser lenses 34, 35, 36; liquid crystal panels 37, 38, 39; color combining dichroic mirrors 40, 41; folding mirrors 42, 43;
3 is provided.

The lamp 1, the concave mirror 3, the first lens array plate 20 composed of a plurality of first lenses 11 arranged two-dimensionally, the condenser lens 6, and the plurality of second lenses arranged two-dimensionally. The portion of the second lens array plate 21 composed of the lens 16 is constituted by the illumination optical device described with reference to FIGS. 1 and 2A and 2B or the illumination optical device described with reference to FIGS.

The cold mirror 30 and the UV
The IR cut filter 31 is provided at a position shown in FIG. 4 in a luminous flux path indicated by a dashed line in order to cut unnecessary heat rays and ultraviolet rays from the lamp 1.

The color separation dichroic mirrors 32 and 33 convert the luminous flux from the lamp 1 or a luminous flux having a color temperature close to this white from the lamp 1 due to its spectral reflection characteristics. In the description, this is referred to as an R light beam), a light beam having a color temperature of green or a color temperature approximating green (hereinafter referred to as a G light beam) and a light beam having a color temperature of blue or a color temperature approximating blue (in the following description) This is a mirror provided at the position shown in FIG. 4 in the light beam path indicated by the dashed line to separate light into three primary color light beams (referred to as B light beam).

The operation of the projection type display device shown in FIG. 4 will be described.

Light beams projected from the lamp 1 to the color separation dichroic mirrors 32 and 33 from the illumination optical device through the cold mirror 30 and the UV / IR cut filter 31 are converted into R light beams, G light beams and B light beams by the color separation dichroic mirror 32. The light is separated and further separated into a G light beam and a B light beam by the color separation dichroic mirror 33.

Then, the separated R light beam enters the liquid crystal panel 37, the G light beam enters the liquid crystal panel 38, and the B light beam enters the liquid crystal panel 39. The liquid crystal panel 37 changes the light transmission state of the R light beam to red. The liquid crystal panel 38 controls the light transmission state of the G light beam according to the video signal of the green signal component, and the liquid crystal panel 39 controls the light transmission state of the B light beam according to the video signal of the blue signal component. Control according to.

The R, G and B luminous fluxes transmitted and emitted from the liquid crystal panels 37, 38 and 39 whose light transmission states are controlled by the video signals are color-combined dichroic mirrors 40 and 41, respectively. And a composite light beam of the R, G, and B light beams is incident on the projection lens unit 23 and is enlarged and projected on a screen 25 that transmits or diffuses and reflects through the projection lens unit 23, and an image corresponding to these video signals is formed. Display information.

According to the example of the projection display apparatus shown in FIG. 4 which is constituted by using the illumination optical apparatus according to the present invention, an illumination optical apparatus having excellent light use efficiency can be realized and a compact projection display apparatus can be realized. it can.

[0077]

According to the present invention, it is possible to realize an illumination optical device having a high light utilization factor without increasing the concentration angle on the illuminated area such as a liquid crystal panel.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an example of a projection display device according to the present invention.

FIG. 2 is a configuration diagram showing an example of a lens array plate according to the present invention.

FIG. 3 is a configuration diagram showing another example of the lens array plate according to the present invention.

FIG. 4 is a configuration diagram showing another example of the projection display device according to the present invention.

FIG. 5 is a configuration diagram showing a conventional illumination optical device.

FIG. 6 is a light flux intensity distribution diagram of a conventional illumination optical device.

FIG. 7 is a diagram illustrating a focused state by a conventional lens array plate.

[Explanation of symbols]

1 ‥‥ lamp, 2 ‥‥ lamp 1, light emitting portion, 3 ‥‥ concave mirror, 4 ‥‥ first lens array plate, 5 ‥‥ second lens array plate, 7 ‥‥ liquid crystal panel, 9 ‥‥ optical axis , 11 ° plural first lenses, 16 ° plural second lenses, 20
{First lens array plate, 21} Second lens array plate, 23} Projection lens unit, 24} Liquid crystal drive unit

Claims (4)

[Claims] 1. An illumination optical apparatus, comprising: a light source unit; a light reflecting unit configured to reflect a light beam of the light source unit in one direction; and a two-dimensional structure on a front surface of the light reflecting unit except for a portion near an optical axis of the light source unit. First lens array means comprising a plurality of lenses having substantially the same aperture dimension arranged in a shape, and two-dimensionally arranged with the optical axis as a center at a predetermined interval from the first lens array means. A second lens array means comprising a plurality of lenses in which the aperture dimensions of a plurality of lenses arranged near the optical axis are larger than the aperture dimensions of the other lenses; and And the light source means provided on the side opposite to the first lens array means and opposed to the second lens array means, and obtained from each of the plurality of lenses of the second lens array means. The first lens array means comprises a condenser lens means for superimposing each of the light beams on the illuminated area, and the respective focal points of the plurality of lenses constituting the first lens array means constitute the first lens array means. The illumination optical device is characterized in that the light utilization factor can be improved by individually connecting the plurality of lenses constituting the second lens array means facing the plurality of lenses individually. . 2. A projection display device, comprising: a light source means; a light reflecting means for reflecting a light beam of the light source means in one direction; and a front surface of the light reflecting means except for a portion near an optical axis of the light source means. First lens array means comprising a plurality of lenses having substantially the same aperture dimension arranged in a two-dimensional manner, and two-dimensionally arranged about the optical axis at a predetermined interval from the first lens array means And a second lens array means comprising a plurality of lenses in which the aperture dimensions of a plurality of lenses arranged near the optical axis are larger than the aperture dimensions of the other lenses; and On the other hand, on the side opposite to the first lens array means side, the light source means is provided opposite to the second lens array means and obtained from each of the plurality of lenses of the second lens array means. Condenser lens means for superimposing each of the light fluxes on the illuminated area, light valve means arranged in the illuminated area, projection optical means for enlarging and projecting the light flux emitted from the light valve means, Screen means for transmitting and reflecting or reflecting and diffusing the light beam magnified and projected by the projection optical means, wherein each of the plurality of lenses constituting the first lens array means is focused on the first lens array. The light utilization factor can be improved by individually tying the plurality of lenses constituting the second lens array means facing each of the plurality of lenses constituting the means. Projection display device. 3. A projection display device, comprising: light source means for generating a light beam including at least three primary colors; light reflecting means for reflecting the light beam of the light source means in one direction; and the light source means on a front surface of the light reflecting means. A first lens array means composed of a plurality of lenses having substantially the same aperture size arranged two-dimensionally except for the vicinity of the optical axis of the first lens array means; A second lens array means comprising a plurality of lenses arranged two-dimensionally around an axis and having apertures of a plurality of lenses arranged near the optical axis larger than the apertures of the other lenses; The first lens array means is provided to the second lens array means for superimposing each of the light fluxes of the light source means obtained from each of the plurality of lenses of the second lens array means on an illuminated area. Condenser lens means provided on the side opposite to the array means side; color separation means for separating the light beam emitted from the condenser lens means into a plurality of color light beams; provided in the illuminated area and separated by the color separation means A plurality of light valve means for separately entering the color light fluxes for each of the color light fluxes; a color synthesis means for synthesizing each of the plurality of color light fluxes emitted from each of the plurality of light valve means; A projection optical unit for enlarging and projecting the light beam synthesized by the unit; and a screen unit for transmitting and diffusing or reflecting the light beam enlarged and projected by the projection optical unit, and constituting the first lens array unit. The second lens array means facing each of the plurality of lenses constituting the first lens array means is configured to focus individual focal points of the plurality of lenses. The projection type display device, wherein the light utilization factor can be improved by individually connecting the plurality of lenses to each other. 4. An illumination optical apparatus, comprising: a light source unit; a light reflecting unit configured to reflect a light beam of the light source unit in one direction; and a two-dimensional structure on a front surface of the light reflecting unit except for a portion near an optical axis of the light source unit. A first lens array means composed of a plurality of lenses having substantially the same aperture size arranged in a shape, and a first lens array means arranged at a predetermined distance from the first lens array means. A second lens array unit in which a plurality of lenses having the same number of lenses and having substantially the same aperture size are two-dimensionally arranged around the optical axis; The plurality of lenses constituting the first lens array means, comprising condenser lens means provided on the side opposite to the first lens array means and opposed to the second lens array means. Of the individual focus, illumination optical apparatus being characterized in that to be able to improve the light utilization by connecting individually to the plurality of lenses constituting said second lens array means.