JPWO2020137704A1 - Projection optics and projector equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To expand a range in which optical characteristics such as a focused state of a projected image and a projection magnification can be adjusted in a projection optical system for a projector device. SOLUTION: It has a first optical system (1) having a lens (L1 to L12) and a second optical system (2) having a concave mirror (3), and moves along a main optical axis (Z). In the projection optical system (100) provided with the mobile optical system composed of the lens (L7) and the lens (L8), which changes the optical characteristics of the projection image (TM), the first optical system (1) is provided with a movable optical system having at least one lens (L6) that moves so as to displace the optical axis (Z1) in a direction intersecting the main optical axis (Z). [Selection diagram] Fig. 1

Description

The present invention relates to a projector device and a projection optical system used therein.

Conventionally, various reflective projector devices have been proposed in which the projection screen is enlarged and the projection space is reduced. For example, in Patent Document 1, a projector in which a first optical system composed of a refracting optical system and a second optical system including a reflecting surface are arranged from a light valve toward a projection screen, that is, from a reduction side to an enlargement side. The projection optics for the device are shown. This type of projection optics is often a moving optic that moves within the folding optics in a direction along the principal optical axis of the folding optics for focusing (focus adjustment) or scaling (zoom). It is composed including a system.

Recently, there has been an increasing demand for larger projection screens, and therefore it is desirable to expand the range in which the optical characteristics such as the in-focus state of the projected image and the projection magnification can be adjusted in the above-mentioned projection optical system. ing. In the projection optical system for a projector device, as shown in Patent Document 2, for example, a part of the lens units constituting the projection optical system can be adjusted with respect to the optical axis. It is known that it is tilted.

Japanese Unexamined Patent Publication No. 2012-108267 Japanese Patent No. 5063224

However, the projection optical system used in the conventional reflection type projector device has room for improvement in expanding the adjustable range of the optical characteristics.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a projector device capable of reliably expanding the adjustable range of optical characteristics, and a projection optical system for the projector device.

The projection optical system according to the present invention
A first optical system having a lens and a second optical system having a concave mirror are arranged in order toward the front, which is the traveling direction of the image light emitted from the image display element.
The image formed on the image display element is imaged as a first intermediate image inside the first optical system, and then formed as a second intermediate image between the first optical system and the second optical system.
The image light from the second intermediate image is projected from the second optical system in the projection direction intersecting the direction along the main optical axis, which is the optical axis of the first optical system, and the image is magnified and projected onto the projected surface as a projection image. Let me
The first optical system is provided with a moving optical system having at least one lens that changes the optical characteristics of the projected image by moving along the main optical axis.
It is a projection optical system
The first optical system includes a movable optical system having at least one lens that moves so as to displace the optical axis in a direction intersecting the main optical axis.
It is characterized by that.

In the projection optical system having the above configuration,
In the effective projection range, which is the range in which the image display surface of the image display element can be projected as a projection image on the projected surface, the direction along the displacement direction of the optical axis is the most from the main optical axis. The main ray of light emitted from the far end, which is the far end, is the far end main ray, and the main ray of light emitted from the near end, which is the end closest to the main optic axis in the projection effective range. Is the near-end main ray,
The incident position of the far-end main ray on the rearmost light incident surface (lens surface) of the movable optical system is set as the far-end main ray incident position, and the incident position of the near-end main ray on the light incident surface is set as the near-end main ray. When the light incident position is set
It is desirable that the movable optical system is arranged at a position where the far-end main ray incident position and the near-end main ray incident position are different.

Further, when the movable optical system is arranged so that the far-end main ray incident position and the near-end main ray incident position are different from each other as described above, the movable optical system includes the first intermediate image and this. It is desirable to have at least one lens placed between the aperture placed in front of the first intermediate image.

In the case of the above configuration, it is desirable that one of the at least one lens is arranged at a position adjacent to the first intermediate image.

Further, in the projection optical system of the present invention, it is desirable that the movable optical system has a positive lens arranged in front of the frontmost lens in the moving optical system.

Further, when the movable optical system is arranged so that the far-end main ray incident position and the near-end main ray incident position are different as described above, the movable optical system is the first optical system. It is desirable to have the lens that is placed most forward.

Further, when the movable optical system is arranged so that the far-end main ray incident position and the near-end main ray incident position are different from each other as described above, the movable optical system is referred to as the first intermediate image. It is desirable to have at least one lens arranged between the aperture and the aperture arranged behind the first intermediate image.

In the case of the above configuration, it is preferable that the movable optical system has a lens arranged in the front of the positive lenses arranged behind the first intermediate image in the first optical system.

Further, as described above, the movable optical system is arranged so that the far-end main ray incident position and the near-end main ray incident position are different from each other, and the movable optical system is the first intermediate image. When having at least one lens arranged between the diaphragm arranged behind the first intermediate image, the movable optical system is arranged behind the first intermediate image and the first intermediate image. It is preferable to have at least one meniscus lens arranged between the diaphragm and the diaphragm.

Further, as described above, when the movable optical system is arranged so that the far-end main ray incident position and the near-end main ray incident position are different from each other, the far-end main ray incident position and the main light The incident position distance Y1 which is the distance between the axes, the distance Y2 between the near-end main ray incident position and the main optical axis, and the focal length f of the entire projection optical system are
4.0> (Y1-Y2) / | f | ≧ 0.8 ・ ・ ・ (1)
It is preferable that the relationship of

Further, in the projection optical system of the present invention,
In the effective projection range, which is the range in which the image display surface of the image display element can be projected as a projection image on the projected surface, the direction along the displacement direction of the optical axis is the farthest from the main optical axis. The main ray of light emitted from the far end, which is the end, is defined as the far end main ray.
The incident position of the far-end main ray on the rearmost light incident surface of the movable optical system is defined as the far-end main ray incident position.
When the emission position of the far-end main ray on the frontmost light emitting surface of the movable optical system is set to the far-end main ray emission position,
The incident position distance Y1 which is the distance between the far-end main ray incident position and the main optical axis and the emission position distance Y3 which is the distance between the far-end main ray emitting position and the main optical axis are
1.3 ≧ Y3 / Y1 ≧ 0.7 ・ ・ ・ (2)
It is preferable that the relationship of

Further, in the projection optical system of the present invention,
The focal length f5 of the movable optical system and the focal length f1 of the first optical system are
70 ＞ ｜ f5 ｜ / ｜ f1 ｜ ≧ 1.0 ・ ・ ・ (3)
It is preferable to satisfy the relationship of.

Further, in the projection optical system of the present invention, it is desirable that the movable optical system is configured as a lens group composed of two or more lenses in the first optical system.

Further, in the projection optical system of the present invention, it is desirable that the movement of the movable optical system has a moving component in a direction orthogonal to the main optical axis.

Further, in the projection optical system of the present invention, it is desirable that the movement of the movable optical system is a movement that changes the angle formed by the optical axis and the main optical axis of the movable optical system.

In that case, it is particularly desirable that the movement of the movable optical system is a movement of tilting the movable optical system around the intersection of the rearmost light incident surface of the movable optical system and the main optical axis.

Further, in the projection optical system of the present invention,
The mobile optical system has a focusing optical system and
The movable optical system moves at least in a state where the focusing optical system is arranged at a position corresponding to the shortest projection distance of the projection optical system or a position corresponding to the longest projection distance.
Is desirable.

Further, in the projection optical system of the present invention,
The mobile optical system has a variable magnification optical system and
The movable optics move, at least, with the variable magnification optics located at the position corresponding to the shortest focal length or the longest focal length of the projection optics.
Is desirable.

Further, in the projection optical system of the present invention,
The moving optical system includes a focusing optical system that changes the projection distance of the projected image to change the focusing state, a variable magnification optical system that changes the projection magnification of the projected image, and correction of curvature of field of the projected image. The image plane curvature correction optical system is provided with at least one of the following.
Is desirable.

And in that case
The mobile optical system has an image plane curvature adjustment optical system,
The movable optical system is at least under a state in which the field curvature adjustment optical system is arranged at a position where the most under-field curvature is generated, or a state where the image plane curvature adjustment optical system is arranged at a position where the most over-field curvature is generated. Move down,
Is desirable.

On the other hand, the projector device according to the present invention
It includes a light source, an optical modulator that modulates the light from the light source, and a projection optical system according to the present invention that projects an optical image of the light modulated by the optical modulator.

Since the projection optical system according to the present invention is configured such that the first optical system includes a movable optical system having at least one lens that moves so as to displace the optical axis in a direction intersecting the main optical axis. By moving this movable optical system, the range in which the optical characteristics can be adjusted can be expanded. The detailed reason will be described later in detail according to each embodiment.

Further, since the projector device according to the present invention uses a projection optical system that exhibits the above-mentioned effects, it is possible to set a large range in which the optical characteristics can be adjusted.

Cross-sectional view showing the lens configuration of the projection optical system of Example 1 together with the main luminous flux. Sectional drawing which shows the lens structure of the projection optical system of Example 1. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 1. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 1. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 1. The figure which shows the spot diagram by the projection optical system of Example 1. The figure which shows the distortion shape by the projection optical system of Example 1. Sectional drawing which shows the lens structure of the projection optical system of Example 2. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 2. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 2. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 2. The figure which shows the spot diagram by the projection optical system of Example 2. The figure which shows the distortion shape by the projection optical system of Example 2. Sectional drawing which shows the lens structure of the projection optical system of Example 3. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 3. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 3. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 3. The figure which shows the spot diagram by the projection optical system of Example 3. The figure which shows the distortion shape by the projection optical system of Example 3. Sectional drawing which shows the lens structure of the projection optical system of Example 4. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 4. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 4. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 4. The figure which shows the spot diagram by the projection optical system of Example 4. The figure which shows the distortion shape by the projection optical system of Example 4. Sectional drawing which shows the lens structure of the projection optical system of Example 5. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 5. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 5. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 5. The figure which shows the spot diagram by the projection optical system of Example 5. The figure which shows the distortion shape by the projection optical system of Example 5. Sectional drawing which shows the lens structure of the projection optical system of Example 6. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 6. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 6. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 6. The figure which shows the spot diagram by the projection optical system of Example 6. The figure which shows the distortion shape by the projection optical system of Example 6. Cross-sectional view showing the lens configuration of the projection optical system of Example 7 together with the main luminous flux. Sectional drawing which shows the lens structure of the projection optical system of Example 7. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 7. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 7. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 7. The figure which shows the spot diagram by the projection optical system of Example 7. The figure which shows the distortion shape by the projection optical system of Example 7. Sectional drawing which shows the lens structure of the projection optical system of Example 8. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 8. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 8. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 8. The figure which shows the spot diagram by the projection optical system of Example 8. The figure which shows the distortion shape by the projection optical system of Example 8. Sectional drawing which shows the lens structure of the projection optical system of Example 9. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 9. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 9. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 9. The figure which shows the spot diagram by the projection optical system of Example 9. The figure which shows the distortion shape by the projection optical system of Example 9. Sectional drawing which shows the lens structure of the projection optical system of Example 10. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 10. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 10. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 10. The figure which shows the spot diagram by the projection optical system of Example 10. The figure which shows the distortion shape by the projection optical system of Example 10. Sectional drawing which shows the lens structure of the projection optical system of Example 11. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 11. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 11. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 11. The figure which shows the free-form surface data of the optical element which comprises the projection optical system of Example 11. The figure which shows the spot diagram by the projection optical system of Example 11. The figure which shows the distortion shape by the projection optical system of Example 11. Cross-sectional view showing a lens configuration at a wide-angle end of the projection optical system of Example 12. Cross-sectional view showing a lens configuration at the telephoto end of the projection optical system of Example 12. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 12. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 12. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 12. The figure which shows the spot diagram by the projection optical system of Example 12. The figure which shows the distortion shape by the projection optical system of Example 12. Cross-sectional view showing a lens configuration at a wide-angle end of the projection optical system of Example 13. Cross-sectional view showing a lens configuration at the telephoto end of the projection optical system of Example 13. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 13. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 13. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 13. The figure which shows the spot diagram by the projection optical system of Example 13. The figure which shows the distortion shape by the projection optical system of Example 13. Cross-sectional view showing a lens configuration at a wide-angle end of the projection optical system of Example 14. A cross-sectional view showing a lens configuration at the telephoto end of the projection optical system of Example 14. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 14. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 14. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 14. The figure which shows the spot diagram by the projection optical system of Example 14. The figure which shows the distortion shape by the projection optical system of Example 14. Cross-sectional view showing a lens configuration at a wide-angle end of the projection optical system of Example 15. Cross-sectional view showing a lens configuration at the telephoto end of the projection optical system of Example 15. The figure which shows the basic data of the optical element which comprises the projection optical system of Example 15. The figure which shows the surface spacing and the amount of eccentricity of each part in the projection optical system of Example 15. The figure which shows the aspherical surface data of the optical element which comprises the projection optical system of Example 15. The figure which shows the spot diagram by the projection optical system of Example 15. The figure which shows the distortion shape by the projection optical system of Example 15. The figure which shows the main specifications in the projection optical system of Examples 1-15. Schematic diagram illustrating areas and points on an image display surface

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing the configuration of a projection optical system 100 according to an embodiment of the present invention together with a main luminous flux. Further, FIG. 2 is a cross-sectional view showing the configuration of the projection optical system 100 of FIG. 1 in detail except for the luminous flux. The cross-sectional view here is when the projection optical system 100 is cut along a plane including an optical path until the main ray of the luminous flux emitted from the center of the projection effective region MA of the image display element 11 reaches the screen. It is a cross-sectional view. The above-mentioned plane is a plane parallel to the plane formed by the Z direction of the main optical axis and the short side direction of the projection effective region MA of the image display element 11. The above-mentioned luminous flux is a luminous flux close to the main optical axis Z, a luminous flux having a maximum angle of view, and an intermediate luminous flux thereof. In FIGS. 1 and 2, the image display surface 11 side of the image display element is the reduction side, and the final lens L12 side of the lens optical system is the enlargement side. In the following, the position in the lens optical system may be described with the enlargement side as the front side and the reduction side as the rear side in consideration of the traveling direction of the luminous flux. The projection optical system 100 shown in FIGS. 1 and 2 corresponds to the first embodiment described later. The basic lens configuration of the projection optical system 100 shown in FIGS. 1 and 2 is the projection optics of Examples 2, 3, 4, 5 and 6 shown in FIGS. 8, 14, 20, 26 and 32, respectively, which will be described later. This is the same as the basic lens configuration of the system 100.

The projection optical system 100 is mounted on a projector device, for example, and projects an image M displayed on an image display surface 11 of an image display element such as a DMD, a transmissive liquid crystal display device, or a reflective liquid crystal display device onto a screen SC. It can be used as a projector. In FIG. 1, the image display surface 11 and the cover glass 12 of the image display element are also shown, assuming that they are mounted on a projector device.

In this projector device, a light beam emitted from a light source (not shown) and then given the information of the image M on the image display surface 11 is incident on the projection optical system 100 through the cover glass 12, and is contained in the projection optical system 100. The first intermediate image IM1 is imaged in the first optical system 1 including the bending optical system. The luminous flux is incident on the second optical system 2 including the concave mirror 3, and the first intermediate image IM1 is further formed as a second intermediate image IM2 between the first optical system 1 and the second optical system 2. The second intermediate image IM2 is reflected and enlarged by the second optical system 2, and is enlarged and projected as a projection image TM on the screen SC. The projection direction TD is a direction that intersects the main optical axis Z of the first optical system 1, which will be described later. In FIG. 1 showing light rays in addition to the lens configuration and FIG. 38, which will be described later, the first intermediate image IM1 and the second intermediate image IM2 are shown by solid lines, and their imaging positions due to the intermediate luminous flux are shown by broken lines. It is shown roughly by the straight line of. In the lens configuration diagrams other than those in FIGS. 1 and 38, only the above-mentioned schematic positions are shown for the first intermediate image IM1 and the second intermediate image IM2 (straight lines shown by solid lines). As shown in FIGS. 1 and 38, the first intermediate image IM1 and the second intermediate image IM2 of each actual embodiment are tilted rearward (reduced side) as they move away from the main optical axis Z (tilt). It is a real image with a shape.

As shown in FIG. 2, the first optical system 1 is configured by arranging the first refractive optics system 10 and the second refractive optics system 20 in this order from the reduction side to the enlargement side. The first refractive optical system 10 has a biconvex lens L1 having aspherical surfaces on both sides having a positive refractive power (hereinafter, simply referred to as “positive”) and having a negative refractive power (hereinafter, simply referred to as “negative”). A biconcave lens L2, a negative biconcave lens L3, a biconvex lens L4 joined to this lens L3, a biconvex lens L5, a biconvex lens L6, and a negative meniscus lens L7 having aspherical surfaces on both sides are used as the main optical axis Z. It is configured by arranging them in order from the reduction side to the enlargement side along the line. On the other hand, in the second refraction optical system 20, a positive meniscus lens L8 having aspherical surfaces on both sides, a biconvex lens L9, a biconvex lens L10, a biconcave lens L11 bonded to the lens L10, and a biconvex lens L12 are used as the main optical axis Z. It is configured by arranging them in order from the reduction side to the enlargement side along the line. The concave mirror 3 constituting the second optical system 2 is supposed to have an aspherical reflecting surface. An aperture diaphragm St is arranged between the lens L1 and the lens L2. The illustrated aperture St does not necessarily represent the size or shape exactly, but indicates the position on the main optical axis Z. Further, the first intermediate image IM1 and the second intermediate image IM2 shown in FIG. 2 show the image positions closest to the main optical axis Z, respectively.

In the following, a partial optical axis that may coincide with the main optical axis Z in the first optical system 1 will be referred to, and the main optical axis Z is the lens L1 on the most reduced side, which is a rotational symmetry. It means an axis shared by each rotation center axis of the concave mirror 3, which is also a rotation symmetry body. In the embodiment, the optical axis shared by the most lens elements among the lens elements constituting the first refraction optical system 10 and the most lens elements among the lens elements constituting the second refraction optical system 20 are used. The shared optical axis and the optical axis (rotational symmetry axis) of the second optical system 2 are shared and configured as the main optical axis Z. In a state where the movable optical system is not eccentric, the first refractive optical system 10 and the second refractive optical system 20 are co-axis optical systems that share a single optical axis, and the first optical system 1 is further. It is a co-axis optical system that shares a single optical axis, and the projection optical system 100 is a co-axis optical system that shares a single optical axis.

The first optical system 1 is provided with a mobile optical system having at least one lens that changes the optical characteristics of the projected image TM by moving along the main optical axis Z. In the embodiment shown in FIG. 1, as an example, the mobile optical system is composed of a positive meniscus lens L8. In this example, the focusing state, which is one of the optical characteristics of the projected image TM, is changed by moving the lens L8 along the main optical axis Z. This optical characteristic is not limited to the focused state, and may be the magnification of the projected image TM or the like when the projection optical system 100 has a scaling function or the like. That is, the change in the optical characteristics is a change in the focus position at the time of focus adjustment (a position where the projection image TM is imaged with reference to the optical element arranged in the front of the projection optical system 100) or an image at the time of zoom adjustment. Projection on the projection surface including the screen SC, including changes in the magnification or changes in the amount of curvature of field when adjusting the curvature of field, as well as changes in aberrations that occur during those adjustments. Refers to a change in the imaging state of the image TM.

Further, the first optical system 1 is provided with a movable optical system having at least one lens that moves so as to displace the optical axis in a direction intersecting the main optical axis Z. In the embodiment shown in FIG. 1, as an example, the movable optical system is composed of a biconvex lens L6. Here, moving so as to displace the optical axis in a direction intersecting the main optical axis Z means moving the optical axis in parallel in a direction orthogonal to the main optical axis Z, and relative to the main optical axis Z. It refers to both tilting the optical axis so as to form an angle. FIG. 1 shows the optical axis Z1 of the lens L6 when it is translated as in the former case. In the following, the translation of the former is referred to as "shift", and the tilt of the latter is referred to as "tilt". The configuration in which such a movable optical system is provided is applied in all of Examples 1 to 15 described later.

Hereinafter, the operation of the above-mentioned movable optical system will be described. As described above, the optical characteristics of the projected image TM can be changed by moving along the main optical axis Z of the moving optical system, but in addition, the optical axis is displaced in the direction in which the movable optical system intersects the main optical axis Z. Move to make it. As a result, the range in which the optical characteristics of the projected image TM can be appropriately changed by moving the movable optical system is wider than in the case where the optical characteristics of the projected image TM can be changed by moving only the moving optical system. It becomes possible to do. As an example, in the embodiment shown in FIGS. 1 and 2 (corresponding to the first embodiment described later), the lenses L7 and L8, which are mobile optical systems, are moved along the main optical axis Z for focus adjustment. The focus position, which is an optical characteristic of the projected image TM, can be changed by the above method, but in addition, the optical axis Z1 of the lens L6 as a movable optical system is moved so as to be displaced with respect to the main optical axis Z. As a result, the focus position of the projected image TM can be properly adjusted in a wider range than the range in which the optical characteristics of the projected image TM can be appropriately changed only by moving the lenses L7 and L8 along the main optical axis Z. It becomes possible to change. The term "appropriately" as used herein means that when the moving optical system is moved according to the purpose of movement (for example, focus adjustment), it accompanies an intended change in optical characteristics (for example, a change in focus position). It means that the deterioration of the imaging performance of the projected image TM due to the unintended aberration and the fluctuation of the imaging position and the imaging magnification that occur can be sufficiently suppressed.

Specifically, for example, by using a movable optical system when moving the lens of the moving optical system to focus (focus adjustment), the focusing range (that is, the imaging performance of the projected image is constant) as compared with the case where it is not used. It is possible to expand the range of the projection distance at which the focus can be adjusted while maintaining the above-mentioned state. To explain this point in more detail, first, when the size of the projected image is changed by changing the projection distance, the focus adjustment lens is moved along the optical axis to adjust the focus while maintaining the optical performance. There is a limit to what you can do. That is, even if the focus is adjusted beyond the upper and lower limits of the adjustable range, the aberration correction is not completed and the imaging performance deteriorates. However, by further displacing the movable optical system, it becomes possible to further expand the upper limit and the lower limit of the focus adjustable range. For example, even if the focus can be adjusted only in the range of 50 inch to 100 inch of the projected image size only by moving the normal focus adjustment lens, by displacing the movable optical system, the projection is larger than the upper limit of 100 inch. Focus adjustment can be performed while maintaining the imaging performance of the projected image up to the image size of 150 inches.

Further, when the lens of the moving optical system is moved to change the magnification (zoom), even if the magnification ratio (ratio of the shortest focal length to the longest focal length) is 10 times, for example, with the lens alone. Further, by dissociating the movable optical system, it is possible to extend the magnification ratio to more than 10 times.

Further, by displacing the movable optical system, it is possible to adjust the curvature of field. The curvature of field caused by changing the projection distance and the projection magnification increases as the size of the projection image increases or the projection angle of view increases. By displacing the movable optical system to correct this increased curvature of field, it is possible to correct the increased curvature of field as compared to the case where it is not displaced. Therefore, from this point, the projection distance and projection It becomes possible to set a larger magnification.

The projection optical system 100 of the present embodiment is arranged eccentrically with respect to the projection effective area MA (see FIG. 99) of the image display surface 11, and the main optical axis Z and the projection effective area MA do not intersect. , So-called offset structure. Further, in the present invention, not only the projection effective region MA but also an offset structure in which the image display surface 11 itself and the main optical axis Z do not intersect can be applied.

Next, light incident on the lens L6 constituting the movable optical system will be described. As shown in FIG. 1, on the image display surface 11 of the image display element, in the projection effective area MA, which is a range in which the projected image TM can be projected onto the screen SC, which is the projected surface, in the displacement direction Y of the optical axis Z1. Consider the far end E1 which is the farthest end from the main optical axis Z and the near end E2 which is the closest end to the main optical axis Z in the direction along the main light axis. Note that FIG. 99 shows a state in which the projection effective region MA, the far end portion E1, the near end portion E2, and the like are viewed from a direction parallel to the main optical axis Z, together with an arrow Y indicating the direction in FIG. Shown. Then, the main ray of light emitted from the far-end portion E1 is referred to as the far-end main ray R1, and the main ray of light emitted from the near-end portion E2 is referred to as the near-end main ray R2. Further, the incident position of the far-end main ray R1 on the rearmost light incident surface La of the movable optical system L6 is set as the far-end main ray incident position P1, and the incident position of the near-end main ray R2 on the light incident surface La is set. When the near-end main ray incident position P2 is set, the movable optical system L6 is arranged so that the far-end main ray incident position P1 and the near-end main ray incident position P2 are different from each other.

In the embodiment of the present invention, the displacement direction Y is a direction along a plane composed of an eccentric direction of the projection optical system 100 and a main optical axis Z direction of the projection optical system 100 with respect to the projection effective region MA. For example, when the projection optical system 100 is eccentrically arranged in one direction (vertical direction) orthogonal to the main optical axis Z direction (front-back direction) with respect to the projection effective region MA, it is emitted from the projection optical system 100. The center of the projected image TM is obliquely projected at a position biased to one side in the vertical direction with respect to the main optical axis Z. At that time, the main ray incident on the center of the projected image TM emitted from the projection optical system 100 travels along a plane composed of the front-back direction and the up-down direction. Therefore, when the main optical axis Z and the screen SC are in a vertical relationship in the plane along which the main ray is along, the optical path length to the imaging position of the luminous flux formed on the lowermost side of the projected image TM (projection optical system 100). There will be a difference between the distance actually traveled by the main rays of each luminous flux from to the projected image TM) and the optical path length to the imaging position of the luminous flux formed on the uppermost side. Due to the difference in the optical path length between the upper side and the lower side, there is a difference between the imaging performance of the luminous flux on the upper side of the projected image TM and the imaging performance of the luminous flux on the lower side. The imaging performance of the entire image TM is affected. Therefore, the displacement direction Y of the movable optical system is set to be a direction along a plane composed of the eccentric direction (vertical direction in the embodiment) of the projection optical system 100 with respect to the projection effective region MA and the main optical axis Z direction of the projection optical system 100. This makes it possible to more appropriately correct the difference in imaging performance above and below the projected image TM. Therefore, it is advantageous to expand the range in which the optical characteristics can be appropriately changed while maintaining the imaging performance of the entire projected image TM.

As described above, the configuration in which the far-end main ray R1 and the near-end main ray R2 are separated from each other and incident on the movable optical system (for example, the lens L6 in the configurations shown in FIGS. 1 and 2) will be described later. It is applied in all of Examples 1 to 15.

Hereinafter, the operation of the above configuration will be described. By incidenting the far-end main ray R1 and the near-end main ray R2 into the movable optical system L6 in a state of being separated from each other, it is possible to make the influence of the displacement of the optical axis Z1 on each main ray different. That is, the higher the image height of the main ray, the higher the sensitivity to the displacement of the optical axis Z1. Therefore, it is possible to correct the difference in imaging performance between the main rays so as to eliminate or reduce it. Therefore, the optical characteristics of the projected image TM can be appropriately adjusted by moving the lenses L7 and L8, which are mobile optical systems. The range that can be changed can be expanded more preferably.

The larger the difference between the incident angles of the far-end main ray R1 and the near-end main ray R2, which are incident on the far-end main ray incident position P1 and the near-end main ray incident position P2, the more the incident position P1 and the incident are incident. The difference in sensitivity of each light ray with respect to the displacement of the optical axis Z1 at the position P2 becomes high. Therefore, the ability to correct the imaging performance at the incident position P1 where the incident angle becomes larger becomes higher than the correction ability at the incident position P2, and as a result, the correction of the projection region where aberrations are more likely to occur is appropriately corrected. It becomes possible to do.

Next, the projection optical system according to another embodiment of the present invention will be described with reference to FIGS. 38 and 39. FIG. 38 is a cross-sectional view showing the configuration of the projection optical system 100 according to another embodiment of the present invention together with the main luminous flux. FIG. 39 is a cross-sectional view showing the configuration of the projection optical system 100 of FIG. 38 in detail except for the luminous flux. In addition, in these FIGS. 38 and 39, the same elements as those in FIGS. 1 and 2 described above are given the same numbers, and the description thereof will be omitted unless otherwise specified (hereinafter, the description thereof). , Similar). Further, in these figures, the prism 4 used for the color synthesis unit or the illumination light separation unit mounted on the projector device is also shown. The projection optical system 100 shown in FIGS. 38 and 39 corresponds to the seventh embodiment described later. Further, the basic lens configuration of the projection optical system 100 shown in FIGS. 38 and 39 is the projection optical system of Examples 8, 9, 10 and 11 shown in FIGS. 45, 51, 57 and 63, respectively, which will be described later. The same as 100, and further, the projection optical system of Example 12 shown in FIGS. 70 and 71, Example 13 shown in FIGS. 77 and 78, Example 14 shown in FIGS. 84 and 85, and Example 15 shown in FIGS. 91 and 92. It is the same as the basic lens configuration of 100.

In the first optical system 1 in this other embodiment, the first refractive optics system 10 and the second refractive optics system 20 are arranged in this order from the reduction side to the enlargement side in the same manner as in the above-described embodiment. It is composed of. The first refractive optics system 10 includes a biconvex lens L1, a biconvex lens L2, a biconvex lens L3, a biconcave lens L4 bonded to the lens L3, a biconvex lens L5, a negative meniscus lens L6 bonded to the lens L5, and a biconcave lens. The L7 and the biconvex lens L8 joined to the lens L7 are arranged in order from the reduction side to the enlargement side along the main optical axis Z. On the other hand, the second refraction optical system 20 includes a positive meniscus lens L9, a biconvex lens L10, a negative meniscus lens L11 having aspherical surfaces on both sides, a biconcave lens L12, a biconvex lens L13 bonded to the lens L12, and both sides having aspherical surfaces. A positive meniscus lens L14, a negative meniscus lens L15 having aspherical surfaces on both sides, a positive meniscus lens L16, a biconvex lens L17, a negative meniscus lens L18, and a biconvex lens L19 bonded to the lens L18 are the main optical axes. It is configured by arranging in order from the reduction side to the enlargement side along Z. The concave mirror 3 constituting the second optical system 2 is supposed to have an aspherical reflecting surface. An aperture diaphragm St1 is arranged between the lens L8 and the lens L9, and an aperture diaphragm St2 is arranged between the lens L17 and the lens L18. Further, a field diaphragm (flare cutter) Sf is arranged between the lens L8 and the lens L9 at a position close to the lens 9.

Next, a preferable partial configuration in the projection optical system of the present invention will be described with reference to the above-mentioned two embodiments. First, the lens arrangement in the movable optical system will be described. When the movable optical system is arranged so that the far-end main ray incident position P1 and the near-end main ray incident position P2 are at different positions as described above, the movable optical system is, for example, FIGS. 38 and 38. As shown in FIG. 39, at least one lens (lens in the examples of FIGS. 38 and 39) arranged between the first intermediate image IM1 and the aperture St2 arranged in front of the first intermediate image IM1. It is desirable to have L15). This configuration is applied in Examples 7 to 13 described later. Incidentally, in the projection optical system of the present invention, the diaphragm St2 may not be arranged as an actual mechanical configuration depending on the optical system, as in Examples 1 to 6 described later. In this case, instead of the position of the aperture St2, it should be read as the intersection of the main optical axis Z and the far-end main ray R1. Is also referred to as "at least one lens arranged between the intersection of the main optical axis Z arranged in front and the far-end main ray R1".

Hereinafter, the operation of the above configuration will be described. The light beam between the first intermediate image IM1 and the diaphragm St2 travels on the optical path in a state where the far-end main ray and the near-end main ray are separated in the direction orthogonal to the main optical axis Z. By arranging the lens of the movable optical system at a position where the far-end main ray and the near-end main ray are separated in this way, there is a difference in the incident angle of each main ray on the light incident surface of this lens. Can be made. As a result, the influence of the displacement of the movable optical system with respect to each principal ray (displacement of the optical axis Z1 with respect to the optical axis Z), specifically, the sensitivity of each principal ray to the displacement of the optical axis Z1, is determined by the incident angle of each principal ray. It is possible to change according to the difference. As a tendency, the incident angle becomes larger as the main ray incident at a position higher in the image height on the light incident surface, and is more strongly affected by the displacement of the optical axis Z1. As a result, it is possible to correct so as to eliminate or reduce the difference in imaging performance depending on the imaging position of the projected image TM due to the movement of the moving optical group, that is, the difference in imaging performance depending on the imaging position of each main ray. It becomes.

In particular, the second bending optical system 20 arranged in front of the first intermediate image IM1 refracts the divergent light from the first intermediate image IM1, and distortion such as trapezoidal distortion and curvature of field are strongly generated. This is a refractive optics system that forms the second intermediate image IM2. Distortion and curvature of field are aberrations (off-axis aberrations) in which the amount of generation increases in proportion to the angle of view. Therefore, the second refraction optical system 20 has the far-end main ray R1 and the near-end main ray R1. This is an optical system for forming an image with a large difference in the image formation position in the optical axis direction and the image formation performance at the image formation position of each light beam including R2. Therefore, by arranging the movable optical system in the second refraction optical system 20, which is a refraction optical system arranged in front of the first intermediate image IM1, the imaging position and the connection in each main ray due to excessive off-axis aberration are formed. It is possible to make appropriate corrections so as to eliminate or reduce the difference in image performance.

As described above, the movable optical system is arranged so that the far-end main ray incident position P1 and the near-end main ray incident position P2 are located at different positions, and the movable optical system is the first intermediate image IM1. When having at least one lens arranged between the first intermediate image IM1 and the aperture St2 arranged in front of the first intermediate image IM1, one of such lenses is adjacent to the first intermediate image IM1. It is desirable that it is placed in a position. Note that this "adjacent" means that another lens does not exist between the intermediate image IM1 and the lens. This configuration is applied in Examples 3 and 8 described later.

Hereinafter, the operation of the above configuration will be described. Each main ray of the ray forming the intermediate image is in a separated state. Therefore, it is easy to separate the main rays of the rays incident on the lens adjacent to the intermediate image. Therefore, by including the lens adjacent to the intermediate image in the movable optical system, the influence of the displacement of the movable optical system lens group on each main ray is dispersed (the sensitivity of each main ray to the displacement of the movable optical system lens group is determined by the main ray. It is possible to change each time), and it is possible to make corrections so as to eliminate or reduce the difference in imaging performance between the main rays.

Further, in the vicinity of the intermediate image in which the image light, that is, the light carrying the image information is formed, the distance between the main ray, the upper ray, and the lower ray of the image light becomes narrower as it is closer to the intermediate image. Therefore, by using a lens adjacent to the intermediate image as a movable optical system, it is possible to reduce the influence on axial aberrations.

The following preferred partial configuration will be described. In the projection optical system 100, for example, as shown in FIG. 20, the movable optical system (consisting of the lens L9 in this example) is included in the moving optical system (consisting of the lenses L7 and L8 in this example). It is preferable to have a positive lens L9 arranged in front of the lens L8 arranged most in front of the lens L8. This configuration is applied in Examples 4, 5 and 6 described later.

With the above configuration, it is not necessary to arrange the movable optical system L9 between the lenses L7 and L8 constituting the mobile optical system, so that the mechanical configuration can be simplified. This point will be described in detail below. Since the moving optical system and the movable optical system actually drive the lens in different directions, the mechanical mechanism for driving the lens is also independent. In that case, if one optical system is sandwiched between the other optical systems, the other optical system divided by one optical system is moved to each divided lens group in order to move each divided lens group. On the other hand, it becomes necessary to prepare a mechanical mechanism for transmitting the driving force, which complicates the mechanical mechanism. On the other hand, if the movable optical system L9 is not arranged between the lenses L7 and L8 as described above, it is not necessary to prepare a mechanical mechanism for transmitting the driving force to each divided lens group. Therefore, the mechanical configuration is simplified.

The following preferred partial configuration will be described. In the projection optical system 100, when the movable optical system is arranged so that the far-end main ray incident position P1 and the near-end main ray incident position P2 are at different positions as described above, the movable optical system For example, as shown in FIG. 26, it is desirable to have a lens (lens L12 in this example) arranged at the frontmost position in the first optical system 1. This configuration is applied in Examples 5 and 6 described later.

Hereinafter, the operation of the above configuration will be described. By using the lens L12 arranged on the frontmost side of the first optical system 1 as the movable optical system, the light rays incident on the light incident surface on the rearmost side of the movable optical system in a state where the main rays are separated can be transmitted to each of them. It is possible to emit light with a small separation of the main light. By doing so, the difference in imaging performance of each main ray (off-axis aberration) and the aberration (axial aberration) due to the deviation between the main ray and the upper and lower rays in the ray (luminous flux) including each main ray should be eliminated or reduced. It becomes possible to correct to.

The following preferred partial configuration will be described. In the projection optical system 100, when the movable optical system is arranged so that the far-end main ray incident position P1 and the near-end main ray incident position P2 are at different positions as described above, the movable optical system For example, as shown in FIG. 1, at least one lens (lens L6 in this example) is arranged between the first intermediate image IM1 and the diaphragm St arranged behind the first intermediate image IM1. It is preferable to have. This configuration is applied in Examples 1, 2, 14 and 15 described later.

Hereinafter, the operation of the above configuration will be described. The light rays between the aperture St and the first intermediate image IM1 travel on the optical path in a state where the far-end main light rays and the near-end main rays are separated in the direction orthogonal to the main optical axis Z. By arranging the lens of the movable optical system at a position where the far-end main ray and the near-end main ray are separated in this way, it is possible to give a difference to each principal ray on the light incident surface of this lens. can. As a result, the influence of the displacement of the movable optical system with respect to each principal ray (displacement of the optical axis Z1 with respect to the optical axis Z), specifically, the sensitivity of each principal ray to the displacement of the optical axis Z1, is determined by the incident angle of each principal ray. It is possible to change according to the difference. As a tendency, the incident angle becomes larger as the main ray incident at a position higher in the image height on the light incident surface, and is strongly affected by the displacement of the optical axis Z1. As a result, it is possible to correct so as to eliminate or reduce the difference in imaging performance depending on the imaging position of the projected image TM due to the movement of the moving optical system, that is, the difference in imaging performance depending on the imaging position of each main ray. It becomes.

In particular, the first refracting optical system 10 arranged behind the first intermediate image IM1 refracts the divergent light from the image M to cause curvature of field, astigmatism, and coma. It is a refraction optical system that forms. The curvature of field, astigmatism, and coma are aberrations whose amount of generation increases in proportion to the angle of view. Therefore, the first refraction optical system 10 has a far-end main ray R1 and a near-end main ray R2. This is an optical system for forming an image with a difference in the image formation position in the optical axis direction and the image formation performance at the image formation position of each light beam including. Therefore, by arranging the movable optical system in the first refraction optical system 10 arranged behind the first intermediate image IM1, the image formation of each luminous flux including the far-end main ray R1 and the near-end main ray R2 is performed. It is possible to form the first intermediate image IM1 by adjusting the difference in performance. Further, the second bending optical system 20 arranged in front of the first intermediate image IM1 is generated in the first intermediate image IM1 because the first intermediate image IM1 is magnified and projected to form the second intermediate image IM2. Aberration will also be increased, but if the movable optical system is arranged in the first refractive optics system 10, the effect of correction by the movable optical system can be increased by the enlargement by the second refractive optics system 20. It is possible to reduce the amount of adjustment.

The following preferred partial configuration will be described. In the projection optical system 100, as described above, the movable optical system is arranged so that the far-end main ray incident position P1 and the near-end main ray incident position P2 are at different positions, and the movable optical system is When having at least one lens arranged between the first intermediate image IM1 and the aperture St arranged behind the first intermediate image IM1, the movable optical system is, for example, as shown in FIG. It is preferable to have a lens (lens L6 in this example) arranged in the front of the positive lenses arranged behind the first intermediate image IM1 in the first optical system 1. This configuration is applied in Example 2 described later.

Hereinafter, the operation of the above configuration will be described. The light rays forming the first intermediate image IM1 are in a state where each main light ray is separated. Therefore, it is easy to separate the light rays incident on the lens adjacent to the intermediate image. This makes it possible to make corrections so as to eliminate or reduce the difference in imaging performance between the main rays. Further, between the diaphragms St and St1 and the first intermediate image IM1, the light rays from the effective display area MA are diverged so as to move away from the main optical axis Z as they travel forward of the main light rays. Therefore, in order to prevent an excessive increase in the external dimensions of the projection optical system 100, the positive lens in between has a function of refracting the ray angle of each main ray toward the optical axis side. Therefore, by using the positive lens as a movable optical system, it is possible to satisfactorily correct the aberration that increases due to the strong bending of the light beam angle. Further, by making the light incident surface of the positive lens constituting the movable optical system a convex surface, the higher the image height of the light beam on the light incident surface, the larger the incident angle, and the higher the image height of the light ray, the more the light incident on the positive lens. The length of the optical path until it enters the surface becomes longer. Therefore, the influence of the displacement of the movable optical system becomes strong, and as a result, it is advantageous in performing the above correction. Further, in the vicinity of the intermediate image in which the image light is formed, the distance between the main ray, the upper ray and the lower ray of the image light becomes narrower as it is closer to the intermediate image. Therefore, by using a lens adjacent to the intermediate image as a movable optical system, it is possible to reduce the sensitivity to axial aberration and prevent the axial aberration from increasing.

The following preferred partial configuration will be described. In the projection optical system 100, as described above, the movable optical system is arranged so that the far-end main ray incident position P1 and the near-end main ray incident position P2 are at different positions, and the movable optical system is When the movable optical system has at least one lens arranged between the first intermediate image IM1 and the diaphragm arranged behind the first intermediate image IM1, the movable optical system is, for example, as shown in FIG. It is preferable to have at least one meniscus lens (lens L7 in this example) arranged between the first intermediate image IM1 and the diaphragm St arranged behind the first intermediate image IM1. This configuration is applied in Examples 2 and 13 described later.

Hereinafter, the operation of the above configuration will be described. Since the power of the lens itself is not strong with respect to the magnitude of the curvature of the lens surface, the meniscus lens is a lens suitable for adjusting the angle of light rays while suppressing the change in the focal length of the optical system. Therefore, when displaced as a movable optical system, it is possible to reduce the influence on other aberrations while adjusting the difference between the main rays that change the incident angle of each main ray incident on the light incident surface. Become.

The following preferred partial configuration will be described. In the projection optical system 100, when the movable optical system is arranged so that the far-end main ray incident position P1 and the near-end main ray incident position P2 are at different positions as described above, for example, FIG. As shown in, the incident position distance Y1 which is the distance between the far-end main ray incident position P1 and the main optical axis Z, and the distance Y2 between the near-end main ray incident position P2 and the main optical axis Z. And the focal length f of the entire system of the projection optical system 100 (the focal length at the wide-angle end at the time of near-point projection) is
4.0> (Y1-Y2) / | f | ≧ 0.8 ・ ・ ・ (1)
It is preferable that the relationship of Since it is difficult to illustrate the distance Y2 in FIG. 1, Y2 is displayed at the position of the near-end main ray incident position P2 for convenience. The distance Y2 is correctly the length of the line segment drawn from the position of Y2 display to the main optical axis Z in the direction orthogonal to the main optical axis Z (the direction indicated by the arrow Y in the figure). This configuration is applied in Examples 1 to 15 described later.

Hereinafter, the operation of the above configuration will be described. By moving the movable optical system to shift or tilt the optical axis Z1, the range in which the optical characteristics of the projected image TM can be appropriately changed by the moving optical system can be expanded. If the value of (Y1-Y2) / | f | falls below the lower limit value defined by Eq. (1), the difference between Y1 and Y2 becomes small, and the height of each main ray to the optical axis. Since the difference between the two is too small, it becomes difficult to correct the difference in imaging property depending on the imaging position for each main ray. Further, if the value of (Y1-Y2) / | f | exceeds the upper limit value defined by the equation (1), Y1 becomes too large and the lens system increases, or the focal length f becomes small. Therefore, the amount of aberration generated becomes excessive, and correction becomes difficult.

The following preferred partial configuration will be described. In the projection optical system 100, when the movable optical system is arranged so that the far-end main ray incident position P1 and the near-end main ray incident position P2 are different from each other as described above, for example, FIG. As shown in the above, the incident position of the far-end main ray R1 on the rearmost light incident surface La of the movable optical system (lens L6 in this example) is set as the far-end main ray incident position P1, and the frontmost light emitting surface. When the emission position of the far-end main ray R1 in Lb is set to the far-end main ray emission position P3,
The incident position distance Y1 which is the distance between the far-end main ray incident position P1 and the main optical axis Z, and the emission position distance Y3 which is the distance between the far-end main ray emission position P3 and the main optical axis Z. And,
1.3 ≧ Y3 / Y1 ≧ 0.7 ・ ・ ・ (2)
It is preferable that the relationship of This configuration is applied in all examples except Examples 5 and 6 described later.

With the above configuration, image shift when moving the movable optical system can be suppressed.

The following preferred partial configuration will be described. In the projection optical system 100, the focal length f5 of the movable optical system and the focal length f1 of the first optical system 1 (referred to as the focal length at the wide-angle end at the time of near-point projection) are
70 ＞ ｜ f5 ｜ / ｜ f1 ｜ ≧ 1.0 ・ ・ ・ (3)
It is preferable that the relationship of This configuration is applied in all examples except Example 5, which will be described later.

With the above configuration, image shift during movement of the moving optical system can be suppressed.

The following preferred partial configuration will be described. In the projection optical system 100, as shown in FIG. 32, for example, the movable optical system is configured as a lens group (lenses L10, L11, and L12 in this example) composed of two or more lenses in the first optical system 1. Is preferable. This configuration is applied in Examples 5, 6 and 13 described later.

With the above configuration, the refraction angle can be adjusted by a plurality of lens surfaces. Therefore, it is possible to more accurately correct aberrations that fluctuate during focus adjustment, scaling, and curvature of field.

The following preferred partial configuration will be described. In the projection optical system 100, the mobile optical system is an optical system for focusing (focus adjustment) that changes the focusing state by changing the projection distance of the projection image TM, and an optical system for variable magnification that changes the projection magnification of the projection image TM. , And it is preferable to include at least one optical system for correcting curvature of field that corrects curvature of field of the projected image TM. This configuration is applied in all of Examples 1 to 15 described later.

Next, Examples 1 to 15 according to the embodiment of the present disclosure will be described. First, the projection optical system of the first embodiment will be described. As described above, the configuration of the projection optical system of the first embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 1 and 2. Regarding the projection optical system of the first embodiment, the basic data of the components are shown in FIG. 3, the data on the surface or the component whose position or angle changes is shown in FIG. 4, and the data on the aspherical coefficient is shown in FIG. In the following, the meanings of the symbols used in those figures will be described by taking the one of Example 1 as an example, but the same is basically the same for Examples 2 to 15.

In the basic data of FIG. 3, the surface number No. In the column of, the surface number of the component on the reduction side is set as the first, and the surface number that gradually increases toward the expansion side is shown. The radius of curvature Ri column shows the radius of curvature of each surface. The sign of the radius of curvature Ri is positive when the surface shape is convex to the reduction side and negative when the surface shape is convex to the expansion side. In the column of the surface spacing di, the distance between the surface with the surface number = i and the surface with the surface number = i + 1 on the main optical axis Z is shown. The unit of the radius of curvature Ri, the surface spacing di, and the effective diameter Di is mm. Further, the column of the refractive index nd shows the refractive index of each optical element with respect to the d line (wavelength 587.6 nm), and the column of the Abbe number νd shows the Abbe number of each optical element with respect to the d line. In the "lens, etc." column, the surface of the image M formed on the image display surface 11 of the light modulator shown in FIGS. 1 and 2, the cover glass 12, the aperture stop St, and the first intermediate image to be imaged. The surface of the IM1, the second intermediate image IM2, the concave mirror 3, and the projected image TM located on the screen SC is also shown. They are described as "OBJ", "CG", "aperture", "intermediate image 1", "intermediate image 2", "MIR", and "IMG", respectively, according to the above description order. The variable surface spacing in the surface spacing di is indicated by adding * to the surface number. Further, the aspherical surface has the surface number No. It is shown with a notation of * in the column of.

The surface spacing shown in FIG. 4 is the same as the surface spacing that is variable as described above, at the time of near point projection (when projected to the closest position within the focusing range: expressed as "near point" in the drawing) and perigee. Each of the projections (when projecting to the farthest position within the focusing range: indicated as "far point" in the drawing) is shown. Further, the amount of eccentricity shown in FIG. 4 indicates the amount of "shift" or "tilt" described above for the lens or the like constituting the movable optical system. Regarding "shift", the positive value is the case where the optical axis Z1 of the lens or the like constituting the movable optical system is translated upward from the main optical axis Z in FIG. 1 and is shown in FIG. The case of moving downward with is shown as a negative value. Regarding "tilt", the angle (degree) at which the optical axis Z1 of the lens or the like constituting the movable optical system is tilted with respect to the main optical axis Z is set to the incident surface shown in FIG. The case of rotating clockwise is shown as a positive value, and the case of rotating clockwise is shown as a negative value.

In the first embodiment, the lens L7 and the lens L8 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, the mobile optical system is composed of these two lenses. Further, in the first embodiment, as shown in FIG. 4, the lens L6 constitutes a movable optical system in which the lens L6 is eccentric by tilting to adjust the focus. Therefore, in the first embodiment, the light incident surface and the light emitting surface of the movable optical system are No. 2 shown in FIG. 3, respectively. There are 14 and 15 faces. The change in the input / output angle of the image light with respect to the lens L6 constituting the movable optical system significantly affects the optical characteristics of the projected image TM. Therefore, when the lens L6 is tilted in this way, there is an effect that the range of change in the optical characteristics can be greatly widened even if the amount of movement thereof is relatively small. In particular, if this tilt is performed centering on the intersection of the light incident surface, which is the rearmost surface of the lens L6, and the main optical axis Z, the above effect becomes even greater.

The data on the aspherical coefficient shown in FIG. 5 shows the surface number of the aspherical surface and the aspherical coefficient on the aspherical surface. As for the shape of the aspherical surface, the coefficients K, A, shown in FIG. 5 are shown in FIG. It is expressed by the following equation using B, C, and D. In addition, "en" means "10 to the nth power".
X = (1 / Rdy) Y ² / [1 + {1- (1 + K) (1 / Rdy) ² Y ² } ^1/2 ] + AY ⁴ + BY ⁶ + CY ⁸ + DY ¹⁰

As described above, the symbols, meanings, and description methods of the data described for Example 1 are the same for Examples 2 to 15 described later unless otherwise specified. Therefore, duplicate description will be omitted below. The numerical data shown in FIGS. 3 to 5 also show values rounded to a predetermined digit as appropriate.

FIG. 6 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the first embodiment. In the figure, (a) is a spot diagram at the time of near point projection, and (b) is a spot diagram at the time of far point projection. Of the four numerical values shown on the left side of each spot diagram, the lower left and right numerical values (units: MM, millimeters) indicate the light emission positions (X coordinate, Y coordinate) on the image display surface 11. The numerical values on the upper left and right indicate the relative values of the X and Y coordinates with respect to the maximum object height. In FIG. 6, in the case of three cases where the X coordinate is 0.000 and the Y coordinate is -1.30, -5.62, and -9.94, the X coordinate is 3.456 and the Y coordinate is -1.30,-. For a total of nine cases, the three cases of 5.62 and -9.94, and the three cases of the X coordinate of 6.912 and the Y coordinate of -1.30, -5.62, and -9.94. The spot diagram is shown. The scale in the figure is 20.0 mm in (a) and 30.0 mm in (b). From FIG. 6, it can be seen that by using the projection optical system of this embodiment, various optical aberrations can be satisfactorily corrected for the object heights of nine points.

FIG. 7 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system 100 of the first embodiment. In the figure, (a) shows the distorted shape at the time of near point projection, and (b) shows the distorted shape at the time of far point projection.

Next, the projection optical system of the second embodiment will be described. As described above, the configuration of the projection optical system of the second embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 1 and 2, and the cross-sectional shape thereof is shown in FIG. Regarding the projection optical system of the second embodiment, the basic data of the components are shown in FIG. 9, the data on the surface or the component whose position or angle changes is shown in FIG. 10, and the data on the aspherical coefficient is shown in FIG.

In the second embodiment, the lens L7 and the lens L8 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, the mobile optical system is composed of these two lenses. Further, in the second embodiment, as shown in FIG. 10, the lens L7 constitutes a movable optical system in which the lens L7 is eccentric by shifting and the focus is adjusted. Therefore, in the second embodiment, the light incident surface and the light emitting surface of the movable optical system are No. 2 shown in FIG. 9, respectively. There are 16 and 17 faces. The effect of the change in the distance of the image light incident on the lens L7 constituting the movable optical system from the main optical axis Z on the projected image TM is slow with respect to the change in the distance. Therefore, when the lens L7 is shifted in this way, it becomes easy to adjust the change range of the optical characteristics by moving the lens L7.

FIG. 12 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the second embodiment. Further, FIG. 13 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of the second embodiment.

Next, the projection optical system of Example 3 will be described. As described above, the configuration of the projection optical system of the third embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 1 and 2, and the cross-sectional shape thereof is shown in FIG. Regarding the projection optical system of the third embodiment, the basic data of the components are shown in FIG. 15, the data related to the surface or the component whose position or angle changes is shown in FIG. 16, and the data related to the aspherical coefficient is shown in FIG.

In the third embodiment, the lens L7 and the lens L8 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, the mobile optical system is composed of these two lenses. Further, in the third embodiment, as shown in FIG. 16, the lens L8 constitutes a movable optical system in which the lens L8 is eccentric by shifting and the focus is adjusted. Therefore, in the third embodiment, the light incident surface and the light emitting surface of the movable optical system are No. 1 shown in FIG. 15, respectively. There are 19 and 20 faces.

FIG. 18 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the third embodiment. Further, FIG. 19 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 3.

Next, the projection optical system of Example 4 will be described. As described above, the configuration of the projection optical system of the fourth embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 1 and 2, and the cross-sectional shape thereof is shown in FIG. Regarding the projection optical system of the fourth embodiment, the basic data of the components are shown in FIG. 21, the data related to the surface or the component whose position or angle changes is shown in FIG. 22, and the data related to the aspherical coefficient is shown in FIG.

In the fourth embodiment, the lens L7 and the lens L8 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, the mobile optical system is composed of these two lenses. Further, in the fourth embodiment, as shown in FIG. 22, the lens L9 constitutes a movable optical system in which the lens L9 is eccentric and the focus is adjusted by shifting and tilting. Therefore, in the fourth embodiment, the light incident surface and the light emitting surface of the movable optical system are No. 2 shown in FIG. It becomes the surface of 21 and 22.

FIG. 24 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the fourth embodiment. Further, FIG. 25 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 4.

Next, the projection optical system of Example 5 will be described. As described above, the configuration of the projection optical system of the fifth embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 1 and 2, and the cross-sectional shape thereof is shown in FIG. 26. Regarding the projection optical system of the fifth embodiment, the basic data of the components are shown in FIG. 27, the data of the surface or the component whose position or angle changes is shown in FIG. 28, and the data of the aspherical coefficient is shown in FIG.

In the fifth embodiment, the lens L7 and the lens L8 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, the mobile optical system is composed of these two lenses. Further, in the fifth embodiment, as shown in FIG. 28, the lens L9, the lens L10, the lens L11, the lens L12, and the concave mirror 3 constitute a movable optical system in which the lens L9, the lens L10, the lens L12, and the concave mirror 3 are eccentric by shifting to adjust the focus. Therefore, in the fifth embodiment, the light incident surface and the light emitting surface of the movable optical system are No. 27 shown in FIG. 27, respectively. There are 21 and 29 faces.

FIG. 30 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the fifth embodiment. Further, FIG. 31 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 5.

Next, the projection optical system of Example 6 will be described. As described above, the configuration of the projection optical system of the sixth embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 1 and 2, and the cross-sectional shape thereof is shown in FIG. 32. Regarding the projection optical system of the sixth embodiment, the basic data of the components are shown in FIG. 33, the data on the surface or the component whose position and angle change are shown in FIG. 34, and the data on the aspherical coefficient is shown in FIG. 35.

In the sixth embodiment, the lens L7 and the lens L8 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, the mobile optical system is composed of these two lenses. Further, in the sixth embodiment, as shown in FIG. 34, the lens L10, the lens L11, and the lens L12 form a movable optical system in which the lens L10, the lens L11, and the lens L12 are eccentric by shifting to adjust the focus. Therefore, in the sixth embodiment, the light incident surface and the light emitting surface of the movable optical system are No. 3 shown in FIG. 33, respectively. There are 23 and 27 faces.

FIG. 36 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the sixth embodiment. Further, FIG. 37 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 6.

Next, the projection optical system of Example 7 will be described. As described above, the configuration of the projection optical system of the seventh embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 38 and 39. Regarding the projection optical system of the seventh embodiment, the basic data of the components are shown in FIG. 40, the data on the surface or the component whose position or angle changes is shown in FIG. 41, and the data on the aspherical coefficient is shown in FIG.

In the basic data of FIG. 40, in the column of "lens, etc.", the surface of the image M formed on the image display surface 11 of the optical modulator shown in FIGS. 38 and 39, the cover glass 12, the prism 4, and the aperture diaphragm The planes of St1, the field diaphragm Sf, the first intermediate image IM1 to be imaged, the aperture diaphragm St2, the second intermediate image IM2, the concave mirror 3, and the projection image TM to be positioned on the screen SC are also shown. For them, "OBJ", "CG", "PRISM", "Aperture 1", "Exit aperture", "Intermediate image 1", "Aperture 2", "Intermediate image 2", "Intermediate image 2", respectively, according to the above description order. It is written as "MIR" and "IMG". Further, in the basic data of FIG. 40, a surface number is also given by listing an element (surface) called a "dummy" in a column such as a lens, but this is a convenience aspect taken for design, and in an actual lens configuration. Does not exist. These notations are the same for Examples 8 to 15 described below.

In the seventh embodiment, the lens L14 and the lens L15 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, the mobile optical system is composed of these two lenses. Further, in the seventh embodiment, as shown in FIG. 41, the lens L15 constitutes a movable optical system in which the lens L15 is eccentric and the focus is adjusted by shifting and tilting. Therefore, in the seventh embodiment, the light incident surface and the light emitting surface of the movable optical system are No. 40 shown in FIG. 40, respectively. There are 34 and 35 faces.

In the seventh embodiment, in the negative meniscus lens L11 having aspherical surfaces on both sides, the positive meniscus lens L14, the negative meniscus lens L15, and the concave mirror 3 having an aspherical reflecting surface, the aspherical surfaces are as follows. It is an odd-order aspherical surface defined by (Equation 1) of. In this equation (Equation 1), z is the coordinate of the aspherical surface in the optical axis direction, c is the reciprocal of the near-axis radius of curvature Rdy, r is the height from the optical axis, and K is the conical constant. The coordinate z is obtained by using the aspherical constant Ai of.

FIG. 43 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the seventh embodiment. Of the four numerical values shown on the left side of each spot diagram, the lower left and right numerical values (units: MM, millimeters) indicate the light emission positions (X coordinate, Y coordinate) on the image display surface 11. The numerical values on the upper left and right indicate the relative values of the X and Y coordinates with respect to the maximum object height. In FIG. 43, when the X coordinate is 0.000 and the Y coordinate is -3.41, -7.95, and -12.5, the X coordinate is 3.629 and the Y coordinate is -3.41, −. About three cases of 7.95 and -12.5, three cases of X coordinate of 7.258 and Y coordinate of -3.41, -7.95 and -12.5, for a total of nine cases The spot diagram is shown. The scale in the figure is 10.0 mm in (a) and 62.5 mm in (b). The above points are the same for Examples 8 to 15 described below. From FIG. 43, it can be seen that various optical aberrations can be satisfactorily corrected for the object heights of nine points by using the projection optical system of this embodiment.

Further, FIG. 44 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system 100 of Example 7.

Next, the projection optical system of Example 8 will be described. As described above, the configuration of the projection optical system of the eighth embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 38 and 39, and the cross-sectional shape thereof is shown in FIG. 45. Regarding the projection optical system of the eighth embodiment, the basic data of the components are shown in FIG. 46, the data of the surface or the component whose position or angle changes is shown in FIG. 47, and the data of the aspherical coefficient is shown in FIG.

In the eighth embodiment, the lens L14 and the lens L15 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, the mobile optical system is composed of these two lenses. Further, in the eighth embodiment, as shown in FIG. 47, the lens L14 constitutes a movable optical system in which the lens L14 is eccentric by tilting to adjust the focus. Therefore, in the eighth embodiment, the light incident surface and the light emitting surface of the movable optical system are No. 46 shown in FIG. 46, respectively. There are 31 and 32 faces.

FIG. 49 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the eighth embodiment. Further, FIG. 50 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 8.

Next, the projection optical system of Example 9 will be described. As described above, the configuration of the projection optical system of the ninth embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 38 and 39, and the cross-sectional shape thereof is shown in FIG. 51. Regarding the projection optical system of the ninth embodiment, the basic data of the components are shown in FIG. 52, the data on the surface or the component whose position and angle change are shown in FIG. 53, and the data on the aspherical coefficient is shown in FIG. 54.

In the ninth embodiment, the lens groups of the lenses L2 to L9, the lens groups of the lenses L10 to L13, and the lens groups of the lenses L14 to L15 move independently of each other along the main optical axis Z, whereby the focus is adjusted. NS. That is, in this embodiment, the mobile optical system is composed of these three lens groups. Further, in the ninth embodiment, as shown in FIG. 53, the lens L15 constitutes a movable optical system in which the lens L15 is eccentric by tilting to adjust the focus. Therefore, in the ninth embodiment, the light incident surface and the light emitting surface of the movable optical system are No. 2 shown in FIG. 52, respectively. There are 34 and 35 faces.

FIG. 55 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the ninth embodiment. Further, FIG. 56 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 9.

Next, the projection optical system of Example 10 will be described. As described above, the configuration of the projection optical system of the tenth embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 38 and 39, and the cross-sectional shape thereof is shown in FIG. 57. Regarding the projection optical system of the tenth embodiment, the basic data of the components are shown in FIG. 58, the data of the surface or the component whose position or angle changes is shown in FIG. 59, and the data of the aspherical coefficient is shown in FIG.

In the tenth embodiment, the lens groups of the lenses L2 to L9, the lens groups of the lenses L10 to L13, and the lens groups of the lenses L14 to L15 move independently of each other along the main optical axis Z, whereby the focus is adjusted. NS. That is, in this embodiment, the mobile optical system is composed of these three lens groups.

Further, in the tenth embodiment, as shown in FIG. 59, the lens L15 constitutes a movable optical system in which the lens L15 is eccentric by tilting to adjust the focus. Therefore, in the tenth embodiment, the light incident surface and the light emitting surface of the movable optical system are shown in FIG. 58, respectively. There are 34 and 35 faces. In particular, in this case, when the lens L15 is tilted, both the aspherical lens surface 34 on the incident side and the aspherical lens surface 35 on the exit side are tilted and shifted. The lens L15 is a wedge lens, and each lens surface is arranged in a state of being shifted and tilted with respect to the main optical axis Z. Specifically, No. The surface of No. 34 is shifted downward by 0.006 mm from the main optical axis Z in FIG. 57, and is tilted so as to rotate 0.281 degrees counterclockwise in FIG. The plane 35 is arranged so as to be shifted upward by 0.021 mm from the main optical axis Z in the figure and tilted so as to rotate 0.282 degrees counterclockwise in the figure.

FIG. 61 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the tenth embodiment. Further, FIG. 62 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 10.

Next, the projection optical system of Example 11 will be described. As described above, the configuration of the projection optical system of the eleventh embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 38 and 39, and the cross-sectional shape thereof is shown in FIG. 63. Regarding the projection optical system of the eleventh embodiment, the basic data of the components are shown in FIG. 64, the data on the surface or the component whose position or angle changes is shown in FIG. 65, and the data on the aspherical coefficient is shown in FIG.

In the eleventh embodiment, the lens groups of the lenses L2 to L9, the lens groups of the lenses L10 to L13, and the lens groups of the lenses L14 to L15 move independently of each other along the main optical axis Z, whereby the focus is adjusted. NS. That is, in this embodiment, the mobile optical system is composed of these three lens groups. Further, in the eleventh embodiment, as shown in FIG. 65, the lens L15 constitutes a movable optical system in which the lens L15 is eccentric by tilting to adjust the focus. Therefore, in the eleventh embodiment, the light incident surface and the light emitting surface of the movable optical system are shown in FIG. 64, respectively. There are 34 and 35 faces.

In the eleventh embodiment, the lens L15 is a free-curved lens in which both the surface 34 on the light incident side and the surface 35 on the light emitting side are free curved surfaces. This free-form surface is a surface whose optical axis coordinate z is defined by the free-form surface polynomial shown by Eq. (Equation 2) below. The free-form surface coefficients for surfaces 34 and 35 are shown in FIG. In Eq. (Equation 2), c is the reciprocal of the radius of curvature Rdy on the near axis, r is the height from the optical axis, and K is the conical constant.

FIG. 68 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the eleventh embodiment. Further, FIG. 69 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 11.

Next, the projection optical system of Example 12 will be described. As described above, the configuration of the projection optical system of the twelfth embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 38 and 39, and the cross-sectional shapes thereof are shown in FIGS. 70 and 71. show. In each of the projection optical systems of Examples 12 and 13, 14, and 15 described later, the first optical system 1 has a scaling (zoom) function, and FIG. 70 shows the first optical system 1. The state at the wide-angle end is shown with the display of (WIDE), and FIG. 71 shows the state at which the first optical system 1 is at the telephoto end with the display of (TELE).

Regarding the projection optical system of the twelfth embodiment, the basic data of the components are shown in FIG. 72, the data on the surface or the component whose position or angle changes is shown in FIG. 73, and the data on the aspherical coefficient is shown in FIG. 74.

In this Example 12, the lens group of the lenses L2 to L8, the lens L9, the lens L10, and the lens group of the lenses L11 to L13 move independently of each other along the main optical axis Z, whereby scaling is performed. That is, in this embodiment, the moving optical system is composed of these lens groups and lenses. The configuration of this point is the same in Examples 13 to 15 described below. In FIG. 73, with respect to the surface whose surface spacing changes due to the scaling, the surface spacing at the wide-angle end is shown together with the WIDE display, and the surface spacing at the telephoto end is shown together with the TELE display. Further, in the twelfth embodiment, the lens L14 and the lens L15 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, these lenses L14 and L15 form a mobile optical system.

Further, in the twelfth embodiment, as shown in FIG. 73, the lens L15 constitutes a movable optical system in which the lens L15 is eccentric by tilting to adjust the focus. Therefore, in the twelfth embodiment, the light incident surface and the light emitting surface of the movable optical system are No. 2 shown in FIG. 72, respectively. There are 35 and 36 faces.

FIG. 75 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the twelfth embodiment. (A) and (b) in FIG. 75 are spot diagrams at the time of near-point projection and at the time of far-point projection when the first optical system 1 is at the wide-angle end, respectively, and (c) and (d) are spot diagrams, respectively. It is a spot diagram at the time of near point projection and at the time of apogee projection when the first optical system 1 is at the telephoto end. Further, FIG. 76 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 12. (A) and (b) in FIG. 76 are distortion shape diagrams during near-point projection and far-point projection when the first optical system 1 is at the wide-angle end, respectively, and FIGS. It is a distortion shape diagram at the time of near point projection and at the time of far point projection when the first optical system 1 is at the telephoto end, respectively.

Next, the projection optical system of Example 13 will be described. As described above, the configuration of the projection optical system of the thirteenth embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 38 and 39, and the cross-sectional shapes thereof are shown in FIGS. 77 and 78. show. The projection optical system 100 of the thirteenth embodiment also has the first optical system 1 having a scaling (zoom) function, and FIG. 77 shows the state where the first optical system 1 is at the wide-angle end (WIDE). In FIG. 78, the state in which the first optical system 1 is at the telephoto end is shown together with the display of (TELE).

For the projection optical system 100 of the thirteenth embodiment, the basic data of the components are shown in FIG. 79, the data of the surface or the component whose position or angle changes is shown in FIG. 80, and the data of the aspherical coefficient is shown in FIG.

In the thirteenth embodiment, the lens group of the lenses L2 to L8, the lens L9, the lens L10, and the lens group of the lenses L11 to L13 move independently of each other along the main optical axis Z, whereby scaling is performed. That is, in this embodiment, the moving optical system is composed of these lens groups and lenses. FIG. 80 shows the surface spacing when the first optical system 1 is at the wide-angle end of the surface whose surface spacing changes due to this scaling, together with the WIDE display, and the surface when the first optical system 1 is at the telephoto end. The intervals are shown with the TELE display. Further, in the thirteenth embodiment, the lens L14 and the lens L15 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, these lenses L14 and L15 also constitute a mobile optical system.

Further, in the thirteenth embodiment, as shown in FIG. 80, a movable optical system is configured in which the lenses L11 to L13 are eccentric and variable in magnification by shifting, and the lens L15 is eccentric and focus-adjusted by tilting. It is configured. Therefore, in the thirteenth embodiment, the light incident surface and the light emitting surface of the variable magnification movable optical system are shown in FIG. 79, respectively. The surfaces are No. 25 and 29, and the light incident surface and the light emitting surface of the focus adjustment movable optical system are No. 25 and 29, respectively, as shown in FIG. 79. There are 35 and 36 faces. Regarding the shift amount, the shift amount when the first optical system 1 is at the wide-angle end is shown together with the WIDE display, and the shift amount when the first optical system 1 is at the telephoto end is shown together with the TELE display.

FIG. 82 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the thirteenth embodiment. Further, FIG. 83 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 13. The display method in FIGS. 82 and 83 is the same as that described above with respect to the twelfth embodiment.

Next, the projection optical system of Example 14 will be described. As described above, the configuration of the projection optical system of the 14th embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 38 and 39, and the cross-sectional shapes thereof are shown in FIGS. 84 and 85. show. The projection optical system 100 of the 14th embodiment also has the first optical system 1 having a scaling (zoom) function, and FIG. 84 shows the state where the first optical system 1 is at the wide-angle end (WIDE). In FIG. 85, the state in which the first optical system 1 is at the telephoto end is shown together with the display of (TELE).

For the projection optical system 100 of the fourteenth embodiment, the basic data of the components are shown in FIG. 86, the data of the surface or the component whose position or angle changes is shown in FIG. 87, and the data of the aspherical coefficient is shown in FIG. 88.

In the 14th embodiment, the lens groups of the lenses L2 to L8, the lenses L9, the lenses L10, and the lens groups of the lenses L11 to L13 move independently of each other along the main optical axis Z, whereby scaling is performed. That is, in this embodiment, the moving optical system is composed of these lens groups and lenses. In FIG. 87, with respect to the surface whose surface spacing changes due to this scaling, the surface spacing at the wide-angle end is shown together with the WIDE display, and the surface spacing at the telephoto end is shown together with the TELE display. Further, in the 14th embodiment, the lens L14 and the lens L15 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, these lenses L14 and L15 also constitute a mobile optical system.

Further, in the 14th embodiment, as shown in FIG. 87, the lens L10 constitutes a movable optical system that is eccentric and variable magnification due to a shift. Therefore, in the 14th embodiment, the light incident surface and the light emitting surface of the movable optical system are shown in FIG. 86, respectively. There are 23 and 24 faces. Regarding the shift amount, the shift amount when the first optical system 1 is at the wide-angle end is shown together with the WIDE display, and the shift amount when the first optical system 1 is at the telephoto end is shown together with the TELE display.

FIG. 89 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of Example 14. Further, FIG. 90 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 14. The display method in FIGS. 89 and 90 is the same as that described above with respect to the twelfth embodiment.

Next, the projection optical system of Example 15 will be described. As described above, the configuration of the projection optical system of the 15th embodiment corresponds to the configuration of the projection optical system 100 whose cross-sectional views are shown in FIGS. 38 and 39, and the cross-sectional shapes thereof are shown in FIGS. 91 and 92. show. The projection optical system of the 15th embodiment also has a first optical system 1 having a scaling (zoom) function, and FIG. 91 shows a state in which the first optical system 1 is at the wide-angle end with a display of (WIDE). FIG. 92 shows the state in which the first optical system 1 is at the telephoto end together with the display of (TELE).

Regarding the projection optical system 100 of the fifteenth embodiment, the basic data of the components are shown in FIG. 93, the data of the surface or the component whose position or angle changes is shown in FIG. 94, and the data of the aspherical coefficient is shown in FIG.

In the 15th embodiment, the lens groups of the lenses L2 to L8, the lenses L9, the lenses L10, and the lens groups of the lenses L11 to L13 move independently of each other along the main optical axis Z, whereby scaling is performed. That is, in this embodiment, the moving optical system is composed of these lens groups and lenses. In FIG. 94, with respect to the surface whose surface spacing changes due to this scaling, the surface spacing at the wide-angle end is shown together with the WIDE display, and the surface spacing at the telephoto end is shown together with the TELE display. Further, in the fifteenth embodiment, the lens L14 and the lens L15 move independently of each other along the main optical axis Z, whereby the focus is adjusted. That is, in this embodiment, these lenses L14 and L15 also constitute a mobile optical system.

Further, in the 15th embodiment, as shown in FIG. 94, the lens L9 constitutes a movable optical system that is eccentric and variable magnification due to tilting. Therefore, in the fifteenth embodiment, the light incident surface and the light emitting surface of the movable optical system are shown in FIG. 93, respectively. It becomes the surface of 21 and 22. Regarding the tilt angle, the tilt angle when the first optical system 1 is at the wide-angle end is shown together with the WIDE display, and the tilt angle when the first optical system 1 is at the telephoto end is shown together with the TELE display.

FIG. 96 shows a spot diagram of the light rays on the screen SC when the light rays are projected onto the screen SC using the projection optical system 100 of the fifteenth embodiment. Further, FIG. 97 shows the distorted shape of the grid pattern on the screen SC when the grid pattern is projected onto the screen SC using the projection optical system of Example 15. The display method in FIGS. 96 and 97 is the same as that described above with respect to the twelfth embodiment.

As described above, according to the projection optical system of the present invention, the range of focus adjustment (that is, the range of projection distance) and the range of focus adjustment (that is, the range of focal length) made by moving the moving optical system are set to the movable optical system. By moving, it becomes possible to make it wider than the range realized only by moving the moving optical system. Considering this effect, the movement of the movable optical system is arranged at least at a position where the focusing optical system of the moving optical system corresponds to the shortest projection distance of the projection optical system or a position corresponding to the longest projection distance. In a state where the moving optical system moves, or at least, the variable magnification optical system of the moving optical system is arranged at a position corresponding to the shortest focal length of the projection optical system or a position corresponding to the longest focal length. It is preferable to move. Further, according to the projection optical system of the present invention, curvature of field can be corrected by moving the movable optical system. Therefore, when the moving optical system has an image plane curvature adjusting optical system, the movable optical system is at least the above-mentioned image plane. It is preferable to move under the state where the curvature adjustment optical system is arranged at the position where the most under curvature of field is generated, or under the state where the curvature adjustment optical system is arranged at the position where the most over curvature of field is generated.

Here, FIG. 98 summarizes the main specifications of the projection optical system 100 of Examples 1 to 15 described above. "Near point f", "Far point f", "Eccentric FOCUS", and "Eccentric ZOOM" in the upper "Focal length" in the figure are "Focal length of the whole system at the time of near point projection" and " It means "the focal length of the entire system at the time of long-distance projection", "the focal length of the movable optical system that adjusts the focus", and "the focal length of the movable optical system that changes the magnification". Further, "eccentricity f" means "focal length of the movable optical system that adjusts or changes the focus", and "first optical system f1" means the focal length of the first optical system 1. Therefore, "| eccentric f | / | first optical system f1 |" corresponds to | f5 | / | f1 | in the above-mentioned equation (3).

On the other hand, the "main ray height (incident)" with respect to the main ray height in the lower part of FIG. 98 means the main ray height at the rearmost light incident surface of the movable optical system, and the "main ray height (emission)". ) ”Means the height of the main ray on the frontmost light emitting surface of the movable optical system. The "upper limit" indicates the above-mentioned "height of the far-end main ray", that is, Y1, and the "lower limit" indicates the "height of the near-end main ray", that is, Y2. In addition, "FOCUS" and "ZOOM" related to the height of the main ray mean "when the focus is adjusted by the moving optical system" and "when the magnification is changed by the moving optical system", respectively. That is, the "FOCUS lower limit" described here represents Y2 of the movable optical system used at the time of focus adjustment, and the "FOCUS upper limit" represents Y1 of the movable optical system used at the time of focus adjustment, and "ZOOM lower limit". "Represents Y2 of the movable optical system used at the time of scaling, and" ZOOM upper limit "represents Y1 of the movable optical system used at the time of scaling. Therefore, "(upper limit-lower limit) / | near point f |" in the lower row sets "(Y1-Y2) / | f |" in the above-mentioned conditional expression (1) to the focal length of the entire system of the projection optical system 100. This corresponds to the case where the distance f is the focal length at the time of near-point projection. Note that FIG. 98 shows an example in which the focal length f of the entire system at the time of near-point projection is calculated as a value particularly at the wide-angle end.

Similarly, the "effective diameter ratio" in the lower part of FIG. 98 indicates Y3 / Y1 in the above-mentioned equation (2). That is, the "FOCUS upper limit" described in the column of the effective diameter ratio is the rearmost light incident surface and the frontmost light emitting surface of the movable optical system used at the time of focus adjustment (in the example of FIG. 1, the lens L6. The incident position distance Y1 which is the distance between the far-end main light incident position P1 and the main optical axis Z with respect to the surface La and the surface Lb), and between the far-end main light emission position P3 and the main optical axis Z. It represents the ratio of the emission position distance Y3, which is the distance, and the "ZOOM upper limit" represents the ratio of the incident position distance Y1 and the emission position distance Y3 similar to the above regarding the movable optical system used at the time of scaling. ..

From the table of FIG. 98, it is confirmed that the conditional expression (1) is satisfied in all the embodiments, and the conditional expression (3) is satisfied in all the other embodiments except the fifth embodiment. Further, it is confirmed that the conditional expression (2) is also satisfied in all the other examples except the examples 5 and 6.

Although the present invention has been described above with reference to embodiments and examples, the projection optical system of the present invention is not limited to that of the above examples, and various aspects can be changed, for example, of each lens. The radius of curvature, the interplanar spacing, the refractive index, and the Abbe number can be changed as appropriate.

Further, the projector device of the present invention can also be changed in various aspects with respect to the light bulb used and the optical member used for luminous flux separation or luminous flux synthesis, for example.

1 1st optical system 2 2nd optical system 3 Concave mirror 4 Prism 10 1st refraction optical system 11 Image display surface of image display element 12 Cover glass 20 2nd refraction optical system 100 Projection optical system L1 to L19 Lens Z Main optical axis Z1 Optical axis of movable optical system

Claims (21)

A first optical system having a lens and a second optical system having a concave mirror are arranged in order toward the front, which is the traveling direction of the image light emitted from the image display element.
An image formed on the image display element is formed as a first intermediate image inside the first optical system, and then as a second intermediate image between the first optical system and the second optical system. Image
The image light from the second intermediate image is projected from the second optical system in a projection direction intersecting the direction along the main optical axis, which is the optical axis of the first optical system, and the image is projected onto the projected surface. Enlarge and project as an image
The first optical system is provided with a mobile optical system having at least one lens that changes the optical characteristics of the projected image by moving along the main optical axis.
It is a projection optical system
The first optical system includes a movable optical system having at least one lens that moves so as to displace the optical axis in a direction intersecting the main optical axis.
A projection optical system characterized by this. In the projection optical system according to claim 1,
The main light is in the direction along the displacement direction of the optic axis in the projection effective region, which is the range in which the projected image can be projected onto the projected surface in the image display surface of the image display element. The main ray of light emitted from the far end, which is the farthest end from the axis, is the far end main ray, and is emitted from the near end, which is the end closest to the main optic axis in the projection effective range. The main ray of light is the near-end main ray,
The incident position of the far-end main ray on the rearmost light incident surface of the movable optical system is defined as the far-end main ray incident position, and the incident position of the near-end main ray on the light incident surface is defined as the near-end main ray. When the light incident position is set
The movable optical system is arranged at a position where the far-end main ray incident position and the near-end main ray incident position are different.
A projection optical system characterized by this. In the projection optical system according to claim 2,
The movable optical system has at least one lens arranged between the first intermediate image and a diaphragm arranged in front of the first intermediate image.
A projection optical system characterized by this. In the projection optical system according to claim 3,
One of the at least one lens is arranged at a position adjacent to the first intermediate image.
A projection optical system characterized by this. In the projection optical system according to any one of claims 1 to 4,
The movable optical system has a positive lens arranged in front of the frontmost lens in the moving optical system.
A projection optical system characterized by this. In the projection optical system according to any one of claims 2 to 5,
The movable optical system has a lens arranged at the frontmost position in the first optical system.
A projection optical system characterized by this. In the projection optical system according to claim 2,
The movable optical system has at least one lens arranged between the first intermediate image and an aperture arranged behind the first intermediate image.
A projection optical system characterized by this. In the projection optical system according to claim 7,
The movable optical system has a lens arranged in the front of the positive lenses arranged behind the first intermediate image in the first optical system.
A projection optical system characterized by this. In the projection optical system according to claim 7 or 8.
The movable optical system has at least one meniscus lens arranged between the first intermediate image and an aperture arranged behind the first intermediate image.
A projection optical system characterized by this. In the projection optical system according to any one of claims 2 to 9.
The distance Y1 between the far-end main ray incident position and the main optical axis, the incident position distance Y2 which is the distance between the near-end main ray incident position and the main optical axis, and the projection optics. The focal length f of the entire system is
4.0> (Y1-Y2) / | f | ≧ 0.8 ・ ・ ・ (1)
Satisfy the relationship,
A projection optical system characterized by this. In the projection optical system according to any one of claims 1 to 10.
In the projection effective region, which is a range in which the image display surface of the image display element can be projected as a projection image on the projected surface, the main light is in a direction along the displacement direction of the optical axis. The main ray of light emitted from the far end, which is the farthest end from the axis, is the far end main ray.
The incident position of the far-end main ray on the rearmost light incident surface of the movable optical system is defined as the far-end main ray incident position.
When the emission position of the far-end main ray on the frontmost light emitting surface of the movable optical system is set to the far-end main ray emission position,
The incident position distance Y1 which is the distance between the far-end main ray incident position and the main optical axis, and the emission position distance Y3 which is the distance between the far-end main ray emitting position and the main optical axis. And,
1.3 ≧ Y3 / Y1 ≧ 0.7 ・ ・ ・ (2)
Satisfy the relationship,
A projection optical system characterized by this. In the projection optical system according to any one of claims 1 to 11.
The focal length f5 of the movable optical system and the focal length f1 of the first optical system are
70 ＞ ｜ f5 ｜ / ｜ f1 ｜ ≧ 1.0 ・ ・ ・ (3)
Satisfy the relationship,
A projection optical system characterized by this. In the projection optical system according to any one of claims 1 to 12,
The movable optical system is configured as a lens group composed of two or more lenses in the first optical system.
A projection optical system characterized by this. In the projection optical system according to any one of claims 1 to 13.
The movement of the movable optical system has a moving component in a direction orthogonal to the main optical axis.
A projection optical system characterized by this. In the projection optical system according to any one of claims 1 to 14.
The movement of the movable optical system is a movement that changes the angle formed by the optical axis of the movable optical system and the main optical axis.
A projection optical system characterized by this. In the projection optical system according to claim 15,
The movement of the movable optical system is a movement of tilting the movable optical system around the intersection of the rearmost light incident surface of the movable optical system and the main optical axis.
A projection optical system characterized by this. In the projection optical system according to any one of claims 1 to 16.
The mobile optical system has a focusing optical system and has a focusing optical system.
The movable optical system moves at least in a state where the focusing optical system is arranged at a position corresponding to the shortest projection distance of the projection optical system or a position corresponding to the longest projection distance.
A projection optical system characterized by this. In the projection optical system according to any one of claims 1 to 17,
The mobile optical system has a variable magnification optical system and has a variable magnification optical system.
The movable optical system moves at least in a state where the variable magnification optical system is arranged at a position corresponding to the shortest focal length of the projection optical system or a position corresponding to the longest focal length.
A projection optical system characterized by this. In the projection optical system according to any one of claims 1 to 18.
The moving optical system includes a focusing optical system that changes the focusing state by changing the projection distance of the projected image, a scaling optical system that changes the projection magnification of the projected image, and an image of the projected image. It includes at least one optical system for correcting curvature of field, which corrects curvature of field.
A projection optical system characterized by this. In the projection optical system according to claim 19,
The moving optical system has an image plane curvature adjusting optical system.
The movable optical system is arranged at least under a state in which the image plane curvature adjusting optical system is arranged at a position where the most under-field curvature is generated, or at a position where the most over-field curvature is generated. Moves while you are
A projection optical system characterized by this. The projection optical system according to any one of claims 1 to 20, wherein a light source, an optical modulator that modulates the light from the light source, and an optical image of the light modulated by the optical modulator are projected. Projector device.

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