JP2004361620A - Projection lens and projector equipped with this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection lens capable of suppressing picture degradation due to birefrinrence and making the manufacture cost inexpensive. <P>SOLUTION: In the projection lens 900 used for a projector which contains a plurality of lenses arranged in parallel in the optical axis direction and projects image light in the tilt direction toward a projection surface, the lens 900A on the projection surface side among a plurality of the lenses is a plastic lens which is molded by an injection molding and has a gate part 900a. Therein, the gate part 900a of the plastic lens is disposed outside an optical usage region A<SB>1</SB>of the image light. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection lens including a plastic lens and a projector including the same.
[0002]
[Prior art]
Some projectors include a tilting mechanism for displaying image light from the electro-optic modulation device toward the projection surface in a tilting direction (see FIG. 1). In the case of such a projector, the region through which the image light passes (optical use region) in the projection lens is located at a portion deviated from the lens optical axis.
[0003]
On the other hand, since a plastic lens is cheaper and easier to process aspherical than a glass lens, the use of such a plastic lens as a projection lens for a projector has been studied (for example, see Patent Document 1). .
However, since a plastic lens is generally manufactured by injection molding, birefringence occurs in the vicinity of the gate portion of the molded body. For this reason, when such a plastic lens is used for a projection lens, the image quality deteriorates due to birefringence in the vicinity of the gate portion.
Therefore, in Patent Document 1, in order to suppress image quality deterioration due to such birefringence, a material made of a special copolymer resin is used as the material of the plastic lens.
[0004]
[Patent Document 1]
JP 11-242104 A
[0005]
[Problems to be solved by the invention]
However, by using such a special copolymer resin, birefringence in the vicinity of the gate portion can be reduced to some extent, but it is not easy to reduce birefringence in the vicinity of the gate portion to an extent that does not affect the image quality. There is a problem.
Therefore, as a method of manufacturing a projection lens using such a plastic lens, a large plastic molded body is once formed by injection molding, and then the periphery of the plastic molded body is largely cut out (including the gate portion). It is conceivable to leave only a relatively small portion at the center and use this small portion as a plastic lens for the projection lens.
However, in the case of this method, there is a problem that the manufacturing cost increases because a large injection mold or a large amount of material is required.
[0006]
Therefore, the present invention has been made to solve such a problem, and provides a projection lens capable of suppressing image quality deterioration due to birefringence and reducing the manufacturing cost, and a projector including the same. The purpose is to do.
[0007]
[Means for Solving the Problems]
(1) A projection lens according to the present invention includes a plurality of lenses arranged in parallel in the optical axis direction, and is a projection lens for use in a projector that projects image light in a tilt direction toward the projection plane. At least one of the plurality of lenses is formed by injection molding and is a plastic lens having a gate portion, and the gate portion of the plastic lens is disposed outside the optical use area of the image light. And
[0008]
For this reason, according to the projection lens of the present invention, since the gate portion of the plastic lens is disposed outside the region through which the image light passes (optical use region), it effectively suppresses image quality degradation due to birefringence. Can do.
Further, according to the projection lens of the present invention, since the molded body including the gate portion can be used as it is as a plastic lens for the projection lens, the manufacturing cost can be reduced.
Therefore, according to the projection lens of the present invention, it is possible to suppress image quality deterioration due to the birefringence and to reduce the manufacturing cost.
[0009]
(2) In the projection lens described in (1) above, it is preferable that the plastic gate portion is disposed on the opposite side of the optical use area on the lens optical axis of the projection lens.
With this configuration, the gate portion is disposed at a position farthest from the optical use area (that is, spaced apart from the optical use area with a sufficient distance to suppress image quality degradation). Image quality degradation due to birefringence can be more effectively suppressed.
[0010]
(3) In the projection lens described in the above (1) or (2), the plastic lens is a lens that is rotated by focus adjustment, and the gate portion is located outside the optical use region by the rotation of the lens. It is preferable that it is comprised so that it may be arrange | positioned.
With this configuration, even when the plastic lens is rotated by focus adjustment, the gate portion is disposed outside the optically used region, so that deterioration in image quality due to birefringence can be suppressed.
[0011]
(4) In the projection lens according to any one of (1) to (3), a lens disposed on the projection plane side among the plurality of lenses is a plastic lens, and a gate portion of the plastic lens is It is preferable that it is disposed below the optical use area.
In the lens arranged on the projection surface side, the region through which the image light passes (optical use region) is at the upper part of the lens. With this configuration, the gate portion of this lens is separated from the optical use region. Since it is arranged on the farthest lower side, image quality deterioration due to birefringence can be effectively suppressed.
[0012]
(5) In the projection lens according to any one of (1) to (4), a lens disposed on the light source side among the plurality of lenses is a plastic lens, and the gate portion of the plastic lens is the It is preferable that it is disposed above the optical use area.
In the lens arranged on the light source side, the area through which the image light passes (optical use area) is located at the lower part of the lens. With this configuration, the gate portion of this lens is the most from the optical use area. Since it is arranged on the far side, image quality deterioration due to birefringence can be effectively suppressed.
[0013]
(6) The projector according to the present invention includes an illumination device that emits illumination light, a color separation optical system that separates illumination light emitted from the illumination device into a plurality of color lights, and each color separated by the color separation optical system. A plurality of electro-optic modulators that respectively modulate the light to form an image, a color synthesis optical system that synthesizes the modulated light emitted from the plurality of electro-optic modulation devices, and an image synthesized by the color synthesis optical system And a projection optical system that projects and displays the image on the projection surface, the projection optical system is a projection optical system having the projection lens according to any one of (1) to (5). And
[0014]
For this reason, the projector according to the present invention includes the projection optical system having the projection lens that can suppress the deterioration of the image quality due to the birefringence and can reduce the manufacturing cost as described above. Therefore, the projector can suppress the image quality deterioration due to the rate and reduce the manufacturing cost.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a projection lens and a projector to which the present invention is applied will be described based on embodiments shown in the drawings.
First, Embodiment 1 of the present invention will be described with reference to FIGS.
[Embodiment 1]
FIG. 1 is an explanatory diagram of a projector according to the first embodiment. FIG. 2 is a plan view showing the optical system of the projector according to the first embodiment. FIG. 3 is an explanatory diagram illustrating a projection optical system including the projection lens according to the first embodiment. FIG. 3A is a rear view thereof, and FIG. 3B is an AA sectional view thereof. FIG. 4 is a front view illustrating a projection surface side lens of the projection lens according to the first embodiment. FIG. 5 is an optical path diagram illustrating a case where image light is transmitted through the projection lens according to the first embodiment.
[0016]
As shown in FIG. 1, the projector according to the first embodiment is a projector including a tilt mechanism for displaying image light from a liquid crystal display device as an electro-optic modulation device toward a projection surface in a tilt direction. .
[0017]
As shown in FIG. 2, the projector 1 according to the first embodiment includes an illumination optical system 100, a color separation optical system 200, a relay optical system 300, three liquid crystal display devices 400R, 400G, and 400B, and a cross dichroic. A prism 500 and a projection optical system 600 are provided. Then, as shown in FIG. 1, the image light is projected in the tilt direction toward the screen SC as the projection surface. The components of each optical system are arranged in a substantially horizontal direction around the cross dichroic prism 500.
[0018]
The illumination optical system 100 includes a light source 110, a first lens array 120, a second lens array 130, a polarization conversion element 140, and a superimposing lens 150. The light beam emitted from the light source 110 is divided into a plurality of minute partial light beams by the first lens array 120, and each of the partial light beams is illuminated by the second lens array 130 and the superimposing lens 150. , 400G, 400B are superimposed on the light incident surface.
[0019]
The first lens array 120 and the second lens array 130 are formed by arranging small lenses in a matrix.
The polarization conversion element 140 has a function of aligning non-polarized light with polarized light having a polarization direction that can be used in the three liquid crystal display devices 400R, 400G, and 400B.
[0020]
The color separation optical system 200 has a function of separating the illumination light emitted from the illumination optical system 100 into three colors of illumination light having different wavelength ranges. The first dichroic mirror 210 transmits substantially red light (hereinafter referred to as “R light”) and substantially green light (hereinafter referred to as “G light”) and substantially blue light (hereinafter referred to as “B light”). .) Reflect. The R light transmitted through the first dichroic mirror 210 is reflected by the reflection mirror 230, passes through the field lens 240R, and illuminates the R liquid crystal display device 400R.
[0021]
The field lens 240R condenses the plurality of partial light beams from the illumination optical system 100 so as to illuminate the liquid crystal display device 400R. Usually, each partial light beam is set to be a substantially parallel light beam. The field lenses 240G and 350 disposed in front of the other liquid crystal display devices 400G and 400B are configured similarly to the field lens 240R.
[0022]
Of the G light and B light reflected by the first dichroic mirror 210, the G light is further reflected by the second dichroic mirror 220 and passes through the field lens 240G to illuminate the G liquid crystal display device 400G. On the other hand, the B light passes through the second dichroic mirror 220, passes through the relay optical system 300, and illuminates the B liquid crystal display device 400B.
[0023]
The relay optical system 300 includes an incident side lens 310, an incident side reflection mirror 320, a relay lens 330, an emission side reflection mirror 340, and a field lens 350. The B light emitted from the color separation optical system 200 is converged in the vicinity of the relay lens 330 by the incident side lens 310 and diverges toward the field lens 350 (exit side reflection mirror 340). The size of the light beam incident on the field lens 350 is set to be approximately equal to the size of the light beam incident on the incident side lens 310.
[0024]
The liquid crystal display devices 400R, 400G, and 400B convert incident color light (R light, G light, and B light) into light corresponding to the corresponding color signals (image signals) and transmit the converted light. Ejected as light. In these liquid crystal display devices 400R, 400G, and 400B, incident-side polarizing plates 918R, 918G, and 918B are disposed on the incident side, and emission-side polarizing plates 920R, 920G, and 920B are disposed on the emission side, respectively. As the liquid crystal display devices 400R, 400G, and 400B, for example, transmissive liquid crystal display devices are used.
[0025]
The cross dichroic prism 500 has a function as a color synthesizing optical system that synthesizes the converted lights of the respective colors emitted from the liquid crystal display devices 400R, 400G, and 400B for the respective colors. The combined light generated in the cross dichroic prism 500 is emitted toward the projection lens 600.
[0026]
As shown in FIG. 3, the projection optical system 600 includes a lens barrel 700, a lens frame 800, and a projection lens 900, and projects the combined light from the cross dichroic prism 500 on a screen (projection image) SC as a display image. It is configured as follows.
[0027]
The lens barrel 700 has two inner and outer flanges 700A and 700B, and is attached to the front surface of a projector casing (not shown).
The lens frame 800 includes a front frame 800A, a rear frame 800B, and an intermediate frame 800C, and is disposed on the virtual axis of the lens barrel 700. The front frame 800A is attached to the front end (projection surface side end) of the lens barrel 700 so as to be movable and rotatable by focus adjustment. The rear frame 800B has a flange portion 800b, and is attached to the rear end portion (light source side end portion) of the lens barrel 700 so that the end surface of the flange portion 800b is in contact with the end surface of the flange portion 700B. The intermediate frame 800C has a flange portion 800c, is positioned between the front frame 800A and the rear frame 800B, and is attached in the lens barrel 700.
[0028]
The projection lens 900 includes five lenses 900 </ b> A to 900 </ b> E arranged in parallel in the optical axis direction, and is attached to the lens frame 800.
The lens 900A is a plastic concave lens formed by injection molding and having both aspheric surfaces, and is attached to the inner peripheral surface of the front frame 800A. The lens 900 </ b> B is made of a glass convex lens, and is attached to the projection surface side end surface of the collar portion 700 </ b> A of the lens barrel 700.
[0029]
The lens 900C is a glass concave lens that forms a lens unit together with the lens 900D, and is attached to the inner peripheral surface of the lens barrel 700 together with the lens 900D via an intermediate frame 800B. The lens 900D is a plastic convex lens having an aspherical light source side surface, and is assembled to the light source side surface of the lens 900C. The lens 900E is made of a glass convex lens, and is attached to the inner peripheral surface of the rear frame 800B.
[0030]
As described above, in the projection lens 900 according to the first embodiment, the lens 900A and the lens 900D are made of plastic lenses. Therefore, the lens 900A and the lens 900D will be described in detail.
[0031]
(Lens 900A)
As described above, the lens 900A is formed of a plastic concave lens formed by injection molding and having both aspheric surfaces. And it is configured to move and rotate by moving and rotating the front frame 800A by focus adjustment.
As shown in FIG. 4, the lens 900 </ b> A has a planar shape substantially similar to each display region (a rectangular shape with an aspect ratio of 3: 4) of the liquid crystal display devices 400 </ b> R, 400 </ b> G, 400 </ b> B (see FIG. 2). An optical use area 900A of image light having ₁ Is formed.
[0032]
This optical use area 900A ₁ Is a planar shape in which the lower horizontal side coincides with the horizontal lens virtual center line b of the vertical and horizontal lens virtual center lines a and b of the lens 900A and is symmetric with respect to the vertical lens virtual center line a at the lens rotation reference position. It is arranged at the site.
A part of the lens periphery of the lens 900A is subjected to a so-called D-cut surface processing, and a gate portion 900a located on the vertical lens virtual center line a is formed in this processing portion. The gate portion 900a has an optical usage area 900A. ₁ Lower side (optical use area 900A in the lens optical axis OC) ₁ On the opposite side of).
For this reason, the gate portion 900a has an optical use area 900A. ₁ Therefore, image quality deterioration due to birefringence is effectively suppressed.
[0033]
In the projection lens 900, when the lens 900A is rotated clockwise from the rotation reference position by focus adjustment so as to be separated from the liquid crystal display device, the optical use area 900A is obtained. ₁ Also rotate relative to it (relative to the gate portion 900a). Further, when the lens 900A is rotated counterclockwise from the rotation reference position by focus adjustment such that the lens 900A approaches the liquid crystal display device, the optical usage region 900A ₁ Also rotate relative to it (relative to the gate portion 900a).
[0034]
Here, if the rotation range of the lens 900A is 30 ° in both the clockwise and counterclockwise directions from the rotation reference position, the optical usage area 900A by focus adjustment is used. ₁ The maximum movement amount M along the lens virtual center line a at the lower end is “N × sin 30 °”.
Therefore, in the present embodiment, the lens virtual center line b obtained by rotating the lens virtual center line b counterclockwise. ₁ And optical use area 900A ₁ When the intersection point with the extension line of the left vertical side is m, a line c passing through the intersection point m and parallel to the imaginary line b is used as the guarantee line c.
A distance L between the guarantee line c and the lens virtual center line b is “N × tan 30 °”, and always satisfies “L> M”. Therefore, by disposing the gate portion 900a below the guarantee line c, the gate portion 900a is always in the optical use area A even when the lens 900A is rotated by focus adjustment. ₁ Therefore, image quality deterioration due to birefringence is effectively suppressed.
[0035]
Optical use area 900A ₁ Is approximately equal to the size of the display area of the liquid crystal display device. Therefore, if a liquid crystal display device having a display area of 0.5 inch diagonal (12.7 mm) is used, N is N = 12.7 mm. Since x (4/5) /2≈5.08 mm, the maximum movement amount M is 2.54 mm, and the above-described distance L is 2.93 mm.
[0036]
In order to more reliably suppress the influence of birefringence near the gate portion 900a, the guarantee line can be further lowered. In this case, for example, if the safety factor is 50%, the distance L from the lens virtual center line b is L = 2.93 × 1.5≈4.40 mm.
[0037]
(Lens 900D)
As described above, the lens 900D is a plastic convex lens having an aspherical light source side surface.
Similarly to the lens 900A, the lens 900D has an optical usage region 900D having a planar shape substantially similar to the display regions of the liquid crystal display devices 400R, 400G, and 400B. ₁ Is formed.
This optical use area 900D ₁ Are arranged in a portion where the upper horizontal side coincides with the horizontal lens virtual center line of the vertical and horizontal lens virtual center lines in the lens 900D and has a plane shape symmetrical with respect to the vertical lens virtual center line.
[0038]
A so-called D-cut surface processing is applied to a part of the lens periphery of the lens 900D in the same manner as the lens 900A, and a gate portion (not shown) located on the vertical lens virtual center line is formed in this processing processing portion. Has been. The gate portion of the lens 900D is an optical use area 900D. ₁ Above (the optically used area 900D in the lens optical axis OC) ₁ On the opposite side of).
Therefore, the gate portion has an optical usage area 900D. ₁ Therefore, image quality deterioration due to birefringence is effectively suppressed.
[0039]
With the above-described configuration, the projector according to the first embodiment extracts the emitted light from the illumination optical system 100 as the R, G, and B color lights by the color separation optical system 200, and the liquid crystal display devices 400R, 400G, After being guided to 400B and modulated in accordance with the color image signal, the respective color lights are combined by the cross dichroic prism 500, and enlarged and displayed as a display image on the screen by the projection optical system 600.
[0040]
At this time, as shown in FIG. 5, the image light from the liquid crystal display devices 400R, 400G, and 400B is transmitted through the projection lens 900 (lenses 900A to 900E) and directed from the projection lens 900 toward the screen SC in the tilt direction. Projected. At this time, since the gate portion of the projection lens 900 (lenses 900A and 900D) is disposed outside the region through which the image light is transmitted (optical use region), it is possible to effectively suppress deterioration in image quality due to birefringence. it can.
Further, since the molded body including the gate portion can be used as it is as a plastic lens for the projection lens, the manufacturing cost can be reduced.
For this reason, according to the projection lens 900 according to the first embodiment, it is possible to suppress image quality deterioration due to the birefringence and to reduce the manufacturing cost.
[0041]
Next, Embodiment 2 of the present invention will be described with reference to FIG.
[Embodiment 2]
FIG. 6 is a front view showing a projection surface side lens of the projection lens according to Embodiment 2 of the present invention. In the second embodiment, the configuration and function of the optical components used in the first embodiment are the same as those in the first embodiment (the position where the optical use area of the projection lens is formed is different). This will be described using the reference numerals of the optical components.
[0042]
In the projection lens 900 shown in the present embodiment, the optical use area of the projection surface side plastic lens at the rotation reference position is below the optical use area shown in Embodiment 1 (in the optical use area of the light source side plastic lens). It is characterized in that it is arranged at a position shifted upward).
[0043]
For this reason, as shown in FIG. 6, the lens 900A has an optical use area 900A having a planar shape substantially similar to each display area of the liquid crystal display devices 400R, 400G, and 400B (see FIG. 2). ₁ Is formed.
[0044]
This optical use area 900A ₁ Is a virtual line segment d parallel to the horizontal lens virtual center line b of the vertical and horizontal lens virtual center lines a and b of the lens 900A at the lens rotation reference position (however, in the optical use area 900A). The vertical lens virtual center that matches the dimension s between the upper horizontal side and the lens virtual center line b: the dimension t = 9: 1 between the lens virtual center line b and the virtual line segment d). It arrange | positions in the site | part used as the plane shape symmetrical about the line a.
A part of the lens periphery of the lens 900A is subjected to a so-called D-cut surface processing, and a gate portion 900a located on the vertical lens virtual center line a is formed in this processing portion. The gate portion 900a has an optical usage area 900A. ₁ Lower side (optical use area 900A in the lens optical axis OC) ₁ On the opposite side of).
For this reason, the gate portion 900a has an optical use area 900A. ₁ Therefore, image quality deterioration due to birefringence is effectively suppressed.
[0045]
In the projection lens 900, when the lens 900A is rotated clockwise from the rotation reference position by focus adjustment so as to be separated from the liquid crystal display device, the optical use area 900A is obtained. ₁ Also rotate relative to it (relative to the gate portion 900a). Further, when the lens 900A is rotated counterclockwise from the rotation reference position by focus adjustment such that the lens 900A approaches the liquid crystal display device, the optical usage region 900A ₁ Also rotate relative to it (relative to the gate portion 900a).
[0046]
Here, if the rotation range of the lens 900A is set to 30 ° in both the clockwise direction and the counterclockwise direction from the rotation reference position, the optical usage region 900A by focus adjustment is used. ₁ Maximum movement amount M at the lower end ₁ Is at least smaller than M (= N × sin 30 °) calculated in the first embodiment.
Therefore, in the present embodiment, the lens virtual center line b obtained by rotating the lens virtual center line b counterclockwise. ₁ And optical use area 900A ₁ When the intersection point with the extension line of the left vertical side at m is m, a line c passing through the intersection point m and parallel to the imaginary line b is moved downward by t. ₁ Guarantee line c ₁ It is used as.
This guarantee line c ₁ Is always in the optical use area 900A ₁ It exists below the lowest end of. For this reason, the gate portion 900a is connected to the guarantee line c. ₁ If the lens 900A is rotated by focus adjustment, the gate portion 900a is always in the optical usage area A. ₁ Therefore, image quality deterioration due to birefringence is effectively suppressed.
[0047]
Optical use area 900A ₁ Is approximately equal to the size of the display area of the liquid crystal display device. Therefore, if a liquid crystal display device having a display area of 0.5 inch diagonal (12.7 mm) is used, N is N = 12.7 mm. X (4/5) /2≈5.08 mm, so this guarantee line c ₁ Distance L from lens imaginary center line b ₁ Is 2.93 mm + 0.76 mm = 3.70 mm.
[0048]
In order to more reliably suppress the influence of birefringence near the gate portion 900a, the guarantee line can be further lowered. In this case, for example, if the safety factor is 50%, the distance L from the lens virtual center line b ₁ L ₁ = 3.70 mm × 1.5≈5.60 mm.
[0049]
Therefore, also in the present embodiment, as in the case of the first embodiment, the gate portion 900a in the projection lens 900 is disposed outside the region through which the image light passes (optical use region). Deterioration can be effectively suppressed.
Further, since the molded body including the gate portion can be used as it is as a plastic lens for the projection lens, the manufacturing cost can be reduced.
Therefore, according to the projection lens 900 according to the second embodiment, image quality deterioration due to the birefringence can be suppressed and the manufacturing cost can be reduced.
[0050]
Of course, the number of lenses constituting the projection lens and the number of plastic lenses in the present invention are not particularly limited to the above-described embodiments.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a projector according to a first embodiment.
FIG. 2 is a plan view showing an optical system of the projector according to the first embodiment.
3 is an explanatory diagram showing a projection optical system including a projection lens according to Embodiment 1. FIG.
4 is a front view showing a projection surface side lens of the projection lens according to Embodiment 1. FIG.
FIG. 5 is an optical path diagram illustrating a case where image light passes through the projection lens according to the first embodiment.
6 is a front view showing a projection surface side lens of the projection lens according to Embodiment 2. FIG.
[Explanation of symbols]
1 projector, 400R, 400G, 400B liquid crystal display device, 500 cross dichroic prism, 600 projection optical system, 700 lens barrel, 800 lens frame, 800A front frame, 800B rear frame, 800C intermediate frame, 900 projection lens, 900A to 900E lens 900A ₁ Optical use area, 900a gate part, a, b lens virtual center line, c guarantee line, m intersection, OC lens optical axis, SC screen

Claims (6)

In a projection lens for use in a projector that includes a plurality of lenses arranged in parallel in the optical axis direction and projects image light in a tilt direction toward the projection plane,
At least one lens among the plurality of lenses is formed by injection molding, and is a plastic lens having a gate portion,
A projection lens, wherein the gate portion of the plastic lens is disposed outside the optical use area of the image light. The projection lens according to claim 1, wherein the plastic gate portion is disposed on an opposite side of the optical use area on a lens optical axis of the projection lens. 3. The projection lens according to claim 1, wherein the plastic lens is a lens that is rotated by focus adjustment, and the gate portion is arranged outside the optical use region even by rotation of the lens. 4. Projection lens characterized by the above. The projection lens according to any one of claims 1 to 3, wherein a lens disposed on a projection plane side among the plurality of lenses is a plastic lens, and a gate portion of the plastic lens is below the optical use area. Projection lens characterized by being arranged on the side. 5. The projection lens according to claim 1, wherein a lens disposed on a light source side among the plurality of lenses is a plastic lens, and a gate portion of the plastic lens is located above the optical use region. A projection lens that is arranged. An illumination device that emits illumination light;
A color separation optical system for separating the illumination light emitted from the illumination device into a plurality of color lights;
A plurality of electro-optic modulation devices that form images by modulating each color light separated by the color separation optical system;
A color synthesizing optical system for synthesizing modulated light emitted from the plurality of electro-optic modulation devices;
In a projector provided with a projection optical system that projects and displays an image synthesized by the color synthesis optical system on a projection surface,
The projector according to claim 1, wherein the projection optical system is a projection optical system having the projection lens according to claim 1.

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