JP2011197211A - Projector device - Google Patents

Abstract

[PROBLEMS] To project a projected image immediately after the power is turned on, to project a smooth projected image without motion blur, and to project a sharp projected image without defocusing over the entire projection surface. Provided is a projector capable of doing this.
Illumination devices 100R, 100G, and 100B including one-dimensional laser light source arrays 10R, 10G, and 10B having a plurality of laser light sources arranged one-dimensionally, and light emitted from each illumination device are guided. Relay optical system 300, one-dimensional scanning device 400 that scans light emitted from each illumination device so as to form a two-dimensional projection image, and projection optical system that projects light emitted from each illumination device onto a projection surface The projector 1000 includes a projection optical system 600 having a field curvature aberration that compensates for a field curvature generated by scanning of the one-dimensional scanning device 400.
[Selection] Figure 1

Description

  The present invention relates to a projector.

  Conventionally, an illumination device including a one-dimensional laser light source array having a plurality of laser light sources arranged one-dimensionally along a predetermined direction and blinking in accordance with image information, and light emitted from the illumination device is guided. A projector that includes a relay optical system and a one-dimensional scanning device that scans light emitted from an illuminating device so as to form a two-dimensional image on a projection surface and projects an image of a one-dimensional laser light source array on the projection surface is known. (For example, refer to Patent Document 1).

  According to the conventional projector, unlike the light source lamp, a laser light source that can be turned on instantaneously is used as a light source, so that a projected image can be projected immediately after the power is turned on. In addition, since a two-dimensional image is formed using a one-dimensional laser light source array capable of high-speed blinking and a one-dimensional scanning device capable of high-speed scanning, it is possible to project a smooth projected image without motion blur. It becomes.

Japanese Patent Laid-Open No. 2003-21804 (refer to FIG. 1 and claim 5 in particular)

  However, the conventional projector has a problem that it is difficult to project a sharp projected image without defocusing over the entire projection surface because the curvature of field is generated by the scanning of the one-dimensional scanning device.

  Therefore, the present invention has been made to solve the above problems, and can project a projected image immediately after power-on, can project a smooth projected image without motion blur, and Another object of the present invention is to provide a projector capable of projecting a sharp projected image without defocusing over the entire projection surface.

[1] A projector according to the present invention includes a lighting device including a one-dimensional laser light source array having a plurality of laser light sources that are one-dimensionally arranged along a predetermined first direction and blink according to image information; A relay optical system that guides light emitted from the device, a one-dimensional scanning device that scans the light emitted from the illumination device so as to form a two-dimensional projection image on a projection surface, and the light emitted from the illumination device. A projection optical system that projects the light to be projected onto the projection plane, wherein at least one of the relay optical system and the projection optical system exhibits a curvature of field generated by scanning of the one-dimensional scanning device. It has a field curvature aberration that causes field curvature to be compensated.

  For this reason, according to the projector of the present invention, the field curvature generated by the scanning of the one-dimensional scanning device and the field curvature generated by the field curvature aberration of at least one of the relay optical system and the projection optical system are mutually different. Since they cancel each other, the curvature of field is eliminated over the entire projection surface, and it becomes possible to project a sharp projected image without defocusing over the entire projection surface.

  Further, according to the projector of the present invention, unlike a conventional projector, since a laser light source that can be turned on instantaneously is used as a light source unlike a light source lamp, a projected image can be projected immediately after the power is turned on. It becomes possible. Further, according to the projector of the present invention, as in the case of the conventional projector, a two-dimensional image is formed using a one-dimensional laser light source array capable of flashing at high speed and a one-dimensional scanning device capable of high-speed scanning. Therefore, it is possible to project a smooth projected image without motion blur.

  As a result, the projector of the present invention can project a projected image immediately after turning on the power, can project a smooth projected image without motion blur, and is not out of focus over the entire projection surface. The projector can project a sharp projected image.

  In the projector of the present invention, “blinks according to image information” means that the light source is turned on or off at an arbitrary brightness according to the image information.

[2] In the projector according to the aspect of the invention, it is preferable that the relay optical system includes an aspheric lens that generates a field curvature in a direction opposite to a field curvature generated by scanning of the one-dimensional scanning device.

  With this configuration, the curvature of field generated by the scanning of the one-dimensional scanning device is appropriately compensated by the action of the relay optical system.

[3] In the projector according to the aspect of the invention, it is preferable that the projection optical system includes an aspheric lens that generates a field curvature in a direction opposite to a field curvature generated by scanning of the one-dimensional scanning device.

  With this configuration, the curvature of field generated by the scanning of the one-dimensional scanning device is appropriately compensated by the action of the projection optical system.

[4] In the projector according to the aspect of the invention, the relay optical system includes a rotationally symmetric aspheric lens that generates a field curvature in the same direction as a field curvature generated by scanning of the one-dimensional scanning device, and the projection As an optical system, a rotationally symmetric aspherical surface that generates a field curvature that compensates for both a field curvature generated by the field curvature aberration of the relay optical system and a field curvature generated by scanning of the one-dimensional scanning device. It is preferable to provide a lens.

  With this configuration, field curvature generated by field curvature aberration of the relay optical system (see FIG. 16A described later) and field curvature generated by scanning of the one-dimensional scanning device (described later). 16 (b)) can be combined to generate rotationally symmetric field curvature (see FIG. 16 (b) described later). As a result, it is possible to eliminate curvature of field by using an easily available rotationally symmetric aspheric lens as the projection optical system. Also, as the relay optical system, a rotationally symmetric aspherical lens is used because almost no field curvature due to field curvature aberration occurs in the direction orthogonal to the direction in which the image of the one-dimensional laser light source array is arranged. It becomes possible.

[5] In the projector according to the aspect of the invention, it is preferable that the one-dimensional scanning device is arranged at the center of curvature of field curvature generated by field curvature aberration of the relay optical system.

  With this configuration, the field curvature generated by the field curvature aberration of the relay optical system and the field curvature generated by the scanning of the one-dimensional scanning device are combined to generate a rotationally symmetric field curvature. It becomes possible to make it.

[6] In the projector according to the aspect of the invention, it is preferable that the one-dimensional scanning device is a galvanometer mirror.

  Since the galvanometer mirror can perform high-speed and high-accuracy scanning, it is possible to realize a smooth projection image without motion blur by using such a configuration.

[7] In the projector according to the aspect of the invention, it is preferable that the one-dimensional scanning device is disposed in an optical path between the relay optical system and an intermediate image forming surface of the relay optical system.

  With such a configuration, the light from the relay optical system can be scanned with a one-dimensional scanning device.

  The intermediate image forming surface of the relay optical system means a surface on which an intermediate image that is an object to be enlarged and projected on the projection surface by the projection optical system is formed.

[8] In the projector according to the aspect of the invention, it is preferable that the one-dimensional scanning device is disposed in an optical path between the intermediate image forming surface of the relay optical system and the projection optical system.

  With such a configuration, the light from the relay optical system can be scanned with a one-dimensional scanning device.

[9] In the projector according to the aspect of the invention, it is preferable that the one-dimensional scanning device is disposed in an optical path between the illumination device and the relay optical system.

  With such a configuration, it becomes possible to scan the light from the illumination device with a one-dimensional scanning device.

[10] In the projector according to the aspect of the invention, as the illumination device, a red one-dimensional laser light source array having a plurality of red laser light sources, and a light spread from the red laser light source are disposed in proximity to the red laser light source. A red illumination device including a red light collimator lens for suppressing light, a green one-dimensional laser light source array having a plurality of green laser light sources, and a light from the green laser light source disposed in proximity to the green laser light source A green illumination device comprising a green light collimator lens that suppresses the spread of light, a blue one-dimensional laser light source array having a plurality of blue laser light sources, and a blue laser light source, And a blue illumination device comprising a blue light collimator lens for suppressing the spread of light It is preferable that the apparatus further includes an illumination device, and further includes a color synthesis prism that synthesizes each color light emitted from the three illumination devices, and the color synthesis prism is disposed in an optical path preceding the one-dimensional scanning device. .

  With such a configuration, a projector capable of projecting a full-color image can be obtained.

[11] In the projector according to the aspect of the invention, the color combining prism is a cross dichroic prism having a substantially X-shaped interface on which a dichroic film is formed. An illumination device that emits color light that passes through the interface is configured to emit color light composed of a p-polarized component, and emits color light that is reflected by at least one of the substantially X-shaped interfaces. Is preferably configured to emit color light composed of s-polarized components.

  In the dichroic film, the light composed of s-polarized light is more easily reflected than the light composed of p-polarized light. Therefore, by adopting such a configuration, the reflection loss in the cross dichroic prism is reduced and the projector has a higher brightness. It becomes possible.

FIG. 3 is a diagram for explaining a projector 1000 according to the first embodiment. The figure shown in order to demonstrate the red illuminating device 100R in Embodiment 1. FIG. The figure shown in order to demonstrate the red one-dimensional laser light source array 10R in Embodiment 1. FIG. The figure shown in order to demonstrate the collimator lens 50R for red light in Embodiment 1. FIG. The figure which shows a mode that the relay optical system 300 in Embodiment 1 and the modifications 1 and 2 forms an intermediate image. FIG. 3 is a diagram for explaining a projected image by the projector 1000 according to the first embodiment. FIG. 3 is a diagram illustrating a principle that field curvature is compensated by the projection optical system according to the first embodiment. FIG. 9 is a diagram for explaining a projector 1002 according to a second embodiment. FIG. 10 is a diagram illustrating a principle that field curvature is compensated by the projection optical system according to the second embodiment. FIG. 10 is a diagram for explaining a projector 1004 according to a third embodiment. FIG. 10 is a diagram illustrating a principle that field curvature is compensated by the projection optical system 600 according to the third embodiment. FIG. 10 is a diagram for explaining a projector 1006 according to a fourth embodiment. FIG. 10 is a diagram illustrating a principle that field curvature is compensated by the relay optical system 302 according to the fourth embodiment. FIG. 10 is a diagram for explaining a projector 1008 according to a fifth embodiment. FIG. 10 is a diagram illustrating a principle that field curvature is compensated by a relay optical system 304 and a projection optical system 604 according to a fifth embodiment. FIG. 10 is a diagram illustrating a principle that field curvature is compensated by a relay optical system 304 and a projection optical system 604 according to a fifth embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an illumination device and a projector of the present invention will be described based on embodiments shown in the drawings.

[Embodiment 1]
1. Configuration of Projector 1000 FIG. 1 is a diagram for explaining a projector 1000 according to the first embodiment. 1A is a side view showing the optical system of the projector 1000, and FIG. 1B is a front view of the optical system of the projector 1000 as viewed from the projection optical system 600 side. In FIG. 1 and FIGS. 5, 7, 8, 9, 10, 11, 12, 12, 13, 14, 15 and 16, which will be described later, the reference numeral P indicates an intermediate image forming surface. is there.
FIG. 2 is a diagram for explaining the red illumination device 100R according to the first embodiment. 2A is a perspective view of the red illumination device 100R, FIG. 2B is a partially enlarged top view of the red illumination device 100R, and FIG. 2C is a partially enlarged side view of the red illumination device 100R. is there. In FIG. 2 and FIG. 3 to be described later, only one red laser light source 30R at one end is indicated by a reference sign, and the reference sign is omitted for the remaining red laser light source 30R. Further, in FIG. 2 and FIG. 4 to be described later, only one plano-convex lens 60 at one end is indicated by a reference sign, and the reference signs for the remaining plano-convex lenses 60 are omitted.

FIG. 3 is a view for explaining the red one-dimensional laser light source array 10R in the first embodiment. FIG. 3A is a perspective view of the red one-dimensional laser light source array 10R, and FIG. 3B is a partially enlarged perspective view of the red one-dimensional laser light source array 10R.
FIG. 4 is a view for explaining the red light collimator lens 50R according to the first embodiment. 4A is a perspective view of the red light collimator lens 50R, and FIG. 4B is a partially enlarged perspective view of the red light collimator lens 50R.

FIG. 5 is a diagram illustrating how the relay lens 300 forms an intermediate image. FIG. 5A is a schematic diagram illustrating an imaging relationship of the relay optical system 300 according to the first embodiment, and FIG. 5B is a schematic diagram illustrating an imaging relationship of the relay optical system 300 according to Modification 1. FIG. 5C is a schematic diagram showing an imaging relationship of the relay optical system 300 in the second modification. In FIG. 5, illustration of optical elements not related to image formation (such as the dichroic prism 200) is omitted. In FIG. 5, a symbol o indicates a light passing region or a light emitting region, and a symbol i indicates a light passing region image or a light emitting region image. A bright place is indicated by a color close to white, and a dark place is indicated by a color close to black.
FIG. 6 is a diagram for explaining a projected image by the projector 1000 according to the first embodiment. FIG. 6A is a schematic diagram showing a state of the screen SCR when the projection image starts to be developed, and FIG. 6B is a schematic diagram showing a state of the screen SCR when the projection image is developed halfway. FIG. 6C is a schematic diagram showing the state of the screen SCR when the projection image has been developed.
FIG. 7 is a diagram illustrating the principle that the field curvature is compensated by the projection optical system 600 according to the first embodiment. FIG. 7A is a diagram illustrating a state in which field curvature is generated by the one-dimensional scanning device 400, and FIG. 7B is a diagram illustrating a state in which field curvature is generated due to field curvature aberration of the projection optical system 600. FIG. 7C is a diagram illustrating a state in which the field curvature generated by the scanning of the one-dimensional scanning device 400 is compensated by the projection optical system 600.

  In the following description, three directions orthogonal to each other are defined as the z-axis direction (direction parallel to the optical axis from the cross dichroic prism 200 to the one-dimensional scanning device 400 in FIG. 1) and the x-axis direction (FIG. 1 ( a) a direction perpendicular to the paper surface and perpendicular to the z axis) and a y axis direction (a direction parallel to the paper surface and perpendicular to the z axis in FIG. 1A).

  As shown in FIG. 1, the projector 1000 according to the first embodiment includes three illumination devices (a red illumination device 100R, a green illumination device 100G, and a blue illumination device 100B), a cross dichroic prism 200, a relay optical system 300, and a one-dimensional scan. An apparatus 400, a field lens 500, and a projection optical system 600 are provided.

  As shown in FIGS. 1 and 2, the red illumination device 100R includes a red one-dimensional laser light source array 10R and a red light collimator lens 50R. The red illumination device 100R emits red light composed of s-polarized components. In order to emit red light composed of s-polarized components, a red one-dimensional laser light source array 10R that emits red light composed of s-polarized components may be used, or red one-dimensional that emits red light composed of p-polarized components. A laser light source array 10R and a λ / 2 plate that converts light composed of a p-polarized component into light composed of an s-polarized component may be used.

  As shown in FIGS. 2 and 3, the red one-dimensional laser light source array 10R includes a substrate 20R and a plurality of red laser light sources 30R. The number of red laser light sources is determined by the total number of pixels and the aspect ratio of the projected image to be projected and the method of the one-dimensional scanning device. For example, as will be described later, when projecting a projection image consisting of 1080 pixels vertically and 1920 pixels horizontally by scanning in the vertical direction with respect to the projection surface, at least 1920 red laser light sources are required.

The substrate 20R has a function of mounting a plurality of red laser light sources 30R. Although detailed description is omitted, the substrate 20R has a function of mediating supply of power to the plurality of red laser light sources 30R, a function of radiating heat generated by the plurality of red laser light sources 30R, and the like.
The plurality of laser light sources 30R are arranged one-dimensionally along a predetermined first direction dR (direction parallel to the z-axis direction) in the red illumination device 100R, and blink according to image information.
The laser light source 30R is composed of a semiconductor laser that emits red light. As shown in FIGS. 2 and 3, the semiconductor laser has a rectangular light emitting region, and is arranged so that the long side of the light emitting region is substantially parallel to the first direction dR in the red illumination device 100 </ b> R. ing.
The size of the light emitting region in the semiconductor laser is, for example, a long side of 8 μm and a short side of 2 μm. The distance from the center of a certain red laser light source 30R to the center of the adjacent red laser light source 30R is, for example, 20 μm. In other words, in this case, between a certain red laser light source 30R and the adjacent red laser light source 30R, There will be a gap of 12 μm.

  As shown in FIGS. 2 and 4, the red light collimator lens 50R is disposed close to the red one-dimensional laser light source array 10R and suppresses the spread of light from the red laser light source 30R. The red light collimator lens 50R is one-dimensionally arranged along the first direction dR in the red illumination device 100R, and includes a one-dimensional lens array having a plurality of plano-convex lenses 60 corresponding to the red laser light sources 30R. . The red light collimator lens 50R is arranged with the convex surface side of the plurality of plano-convex lenses 60 facing the red one-dimensional laser light source array 10R.

As shown in FIGS. 2C and 4B, the plano-convex lens 60 has an incident surface 62, an incident surface 64, and an exit surface 66.
In the plano-convex lens 60, since the convex surface faces the direction of the red one-dimensional laser light source array 10R, the incident surface 62 and the surface 64 of the incident surface are at the positions shown in FIGS. 2 (c) and 4 (b).
Since the emission surface 66 is a flat surface, the emission surface and the surface of the emission surface are the same surface.

  The shape of the plurality of plano-convex lenses 60 is a shape (aspherical shape) such that the image of the light passage region has a substantially square shape. By adopting such a configuration, it becomes possible to arrange an intermediate image that is projected and magnified on the projection plane by the projection optical system 600 on the projection plane with almost no gap even in a direction perpendicular to a predetermined direction. It becomes possible to project a more natural projection image.

As shown in FIG. 1, the green lighting device 100G is arranged one-dimensionally along a predetermined first direction dG (a direction parallel to the x axis, not shown) in the green lighting device 100G, and is displayed in the image information. A green one-dimensional laser light source array 10G having a plurality of green laser light sources 30G (not shown) that flash in response, and a collimator lens 50G for green light that suppresses the spread of light from the green laser light source 30G are provided. Since the green illumination device 100G has basically the same configuration as the red illumination device 100R except that it emits green light composed of p-polarized light, the description thereof is omitted.
The blue illumination device 100B is arranged in a one-dimensional manner along a predetermined first direction (a direction parallel to the z axis; not shown) in the blue illumination device 100B, and blinks in accordance with image information. A blue one-dimensional laser light source array 10B having a light source 30B (not shown) and a blue light collimator lens 50B for suppressing the spread of light from the blue laser light source 30B are provided. The blue illumination device 100B basically has the same configuration as the red illumination device 100R except that it emits blue light, and thus the description thereof is omitted.

  In addition, arrangement | positioning of the red illuminating device 100R, the green illuminating device 100G, and the blue illuminating device 100B which are shown in Embodiment 1 is an example, and you may replace the position of each illuminating device. Even in this case, the illumination device that emits the color light that passes through the substantially X-shaped interface is configured to emit the color light composed of the p-polarized component, and is reflected by at least one of the substantially X-shaped interfaces. If the illumination device that emits the colored light is configured to emit the color light composed of the s-polarized component, the effect (described later) of the projector 1000 according to the first embodiment is not impaired.

The cross dichroic prism 200 is a color synthesis prism that synthesizes each color light emitted from three illumination devices (red illumination device 100R, green illumination device 100G, and blue illumination device 100B). As shown in FIG. 1, the cross dichroic prism 200 is disposed in the optical path upstream of the one-dimensional scanning device 400.
The cross dichroic prism 200 has a substantially X-shaped interface on which a dielectric multilayer film that is a dichroic film is formed. The dielectric multilayer film formed on one interface having a substantially X shape reflects red light and allows green light to pass therethrough, and the dielectric multilayer film formed on the other interface reflects blue light. It allows green light to pass through. These dielectric multilayer films reflect red light and blue light, and are aligned with the traveling direction of green light, thereby synthesizing three color lights.

  The relay optical system 300 guides light emitted from the three illumination devices. The relay optical system 300 includes a convex lens. The relay optical system may be composed of a plurality of optical elements.

  The exit surface 62 of the red light collimator lens 50R and the intermediate image forming surface P of the relay optical system 300 are in an optically conjugate position as shown in FIG. Although not shown, the emission surface 62 of the green light collimator lens 50G and the blue light collimator lens 50B are optically coupled to the intermediate image forming surface P of the relay optical system 300 in the same manner as the red light collimator lens 50R. Is in a conjugate position. For this reason, on the intermediate image forming surface P in the relay optical system 300, an intermediate image is formed in which the images i of the plurality of light passing regions on the exit surface of each collimator lens are arranged in a predetermined direction with almost no gap. This makes it possible to project a natural projected image. In FIG. 5, only five light passing area images i are displayed for the sake of simplicity, but in reality, a larger number of light passing area images (for example, in a vertical direction with respect to the projection plane). By projecting, when projecting a projection image consisting of 1080 pixels vertically and 1920 pixels horizontally, 1920 light-passing region images) are projected. The projector 1000a according to the first modification and the projector 1000b according to the second modification illustrated in FIGS. 5B and 5C will be described later.

The one-dimensional scanning device 400 scans the light emitted from the three illumination devices so as to form a two-dimensional projection image on the projection surface of the screen SCR. The one-dimensional scanning device 400 is disposed in the optical path between the relay optical system 300 and the intermediate image forming surface P of the relay optical system 300. The one-dimensional scanning device 400 includes a galvanometer mirror, and includes a mirror unit 410 that reflects light and a drive unit 420 that drives the mirror unit 410 with an electric signal.
As will be described later (see FIG. 6), the one-dimensional scanning device 400 performs one-dimensional scanning so that the projected image is scanned in the vertical direction on the projection surface of the screen SCR.
The projection optical system 600 projects the light emitted from the three illumination devices onto the projection surface of the screen SCR together with the field lens 500. The projection optical system 600 includes an aspheric lens that generates a curvature of field in a direction opposite to the curvature of field generated by the scanning of the one-dimensional scanning device 400.

Projection of a projected image by the projector 1000 will be described with reference to FIG.
First, as shown in FIG. 6A, light from the three light source devices is applied to the upper end of the projection surface of the screen SCR by the relay optical system 300, the one-dimensional scanning device 400, the field lens 500, and the projection optical system 600. Projected.
Next, the projected light moves downward by the scanning of the one-dimensional scanning device. At this time, the laser light source in each one-dimensional laser light source array blinks according to the image information in accordance with the movement of the projected light. When the state shown in FIG. 6C is reached after the state shown in FIG. 6B, one two-dimensional projection image is developed in the entire projection area. Thereafter, the development of the projected image is repeated according to the method described above. The frequency of repeating the development can be arbitrarily determined, and can be, for example, about 60 times per second.

The principle that the field curvature is compensated by the projection optical system 600 according to the first embodiment will be described with reference to FIG.
On the intermediate image forming surface P, field curvature occurs due to scanning by the one-dimensional scanning device 400. At this time, when a normal projection optical system 602 is used, an intermediate image having a curvature of field is projected as it is onto the projection plane as shown in FIG. Blurring occurs, making it difficult to project a sharp projected image that is not out of focus over the entire projection surface.
Therefore, in the first embodiment, instead of the normal projection optical system 602, projection optics having a field curvature aberration that generates a field curvature that compensates for the field curvature generated by the scanning of the one-dimensional scanning device 400 is used. The system 600 is used (see FIG. 7B). Therefore, according to the projector 1000 according to the first embodiment, the field curvature generated by the scanning of the one-dimensional scanning device 400 and the field curvature generated by the field curvature aberration of the projection optical system 600 cancel each other. As shown in FIG. 7 (c), the curvature of field is eliminated over the entire projection surface, and it becomes possible to project a sharp projected image without defocusing over the entire projection surface.

2. Effects of Projector 1000 According to the projector 1000 according to the first embodiment, as described above, the field curvature generated by the scanning of the one-dimensional scanning device 400 and the field curvature generated by the field curvature aberration of the projection optical system 600 are described. Cancel each other, so that the curvature of field is eliminated over the entire projection surface, and it becomes possible to project a sharp projected image without defocusing over the entire projection surface.

  Also, according to the projector 1000 according to the first embodiment, unlike a conventional projector, since a laser light source that can be turned on instantaneously is used as a light source unlike a light source lamp, a projected image is projected immediately after the power is turned on. It becomes possible to do. Further, according to the projector 1000 according to the first embodiment, a two-dimensional image is formed using a one-dimensional laser light source array capable of high-speed blinking and a one-dimensional scanning device capable of high-speed scanning, as in the case of a conventional projector. Therefore, it is possible to project a smooth projected image without motion blur.

  As a result, the projector 1000 according to the first embodiment can project a projected image immediately after turning on the power, can project a smooth projected image without motion blur, and can focus on the entire projection surface. The projector can project a sharp projected image without blur.

  Further, according to the projector 1000 according to the first embodiment, the projection optical system 600 includes the aspheric lens that generates the curvature of field that compensates for the curvature of field generated by the scanning of the one-dimensional scanning device 400. The field curvature generated by the scanning of the one-dimensional scanning device is appropriately compensated by the action of the projection optical system.

  Further, according to the projector 1000 according to the first embodiment, since the one-dimensional scanning device 400 includes a galvano mirror, it is possible to realize a smooth projection image without motion blur.

  Further, according to the projector 1000 according to the first embodiment, the one-dimensional scanning device 400 is disposed in the optical path between the relay optical system 300 and the intermediate image forming surface P of the relay optical system 300. It becomes possible to scan the light from the system with a one-dimensional scanning device.

  In addition, the projector 1000 according to the first embodiment includes the three illumination devices of the red illumination device 100R, the green illumination device 100G, and the blue illumination device 100B, and the cross dichroic prism (color synthesis prism). A projector capable of projecting a full-color image can be obtained.

  Further, according to the projector 1000 according to the first embodiment, the color synthesis prism is the cross dichroic prism 200, and among the three illumination devices, an illumination device that emits colored light that passes through a substantially X-shaped interface (green illumination) The device 100G) is configured to emit color light including a p-polarized component, and emits color light reflected by at least one of the substantially X-shaped interfaces (red illumination device 100R and blue illumination device 100B). ) Is configured to emit color light composed of s-polarized components, and therefore, it is possible to reduce the reflection loss in the cross dichroic prism 200 and to achieve a projector with higher brightness.

  It should be noted that each laser light source and the intermediate image forming surface in the relay optical system are in an optically conjugate position (“the projector 1000a according to the first modification in which each illumination device does not include a collimator lens (see FIG. 5 described above). (See (b).) ”And“ Projector 1000b according to Modification 2 (see FIG. 5C described above) in which each lighting device includes a collimator lens ”). Unlike the case, images of a plurality of light passing regions are formed in a state of being discretely arranged along a predetermined direction at the position of the intermediate image forming surface P of the relay optical system 300.

  However, these projectors (the projector 1000a according to the first modification example and the projector 1000b according to the second modification example) also generate image planes generated by scanning by the one-dimensional scanning device 400, as in the case of the projector 1000 according to the first embodiment. Since the curvature and the curvature of field generated by the curvature of field aberration of the projection optical system 600 cancel each other, as shown in FIG. 7 (c), the curvature of field is eliminated over the entire projection surface. It is possible to project a sharp projected image without defocusing over the entire surface.

[Embodiment 2]
FIG. 8 is a diagram for explaining a projector 1002 according to the second embodiment. 8A is a side view showing the optical system of the projector 1002, and FIG. 8B is a front view of the optical system of the projector 1002 as viewed from the projection optical system 600 side.
FIG. 9 is a diagram illustrating the principle that field curvature is compensated for by the projection optical system 600 according to the second embodiment. FIG. 9A is a diagram illustrating a state in which field curvature occurs due to scanning by the one-dimensional scanning device 400, and FIG. 9B illustrates a state in which field curvature occurs due to field curvature aberration of the projection optical system 600. FIG. 9C is a diagram illustrating a state where the projection optical system 600 compensates for the field curvature generated by the scanning of the one-dimensional scanning device 400.

  The projector 1002 according to the second embodiment basically has the same configuration as the projector 1000 according to the first embodiment, but the arrangement position of the one-dimensional scanning device is different from that of the projector 1002 according to the first embodiment. That is, in the projector 1002 according to the second embodiment, as illustrated in FIGS. 8 and 9, the one-dimensional scanning device 400 is in the optical path between the intermediate image forming surface P of the relay optical system 300 and the projection optical system 600. Is arranged.

  As described above, the projector 1002 according to the second embodiment is different from the case of the projector 1000 according to the first embodiment in the arrangement position of the one-dimensional scanning device 400, but the field curvature generated by the scanning of the one-dimensional scanning device 400 is different. Since the field curvature generated by the field curvature aberration of the projection optical system 600 cancels each other, the field curvature is eliminated over the entire projection surface, as in the case of the projector 1000 according to the first embodiment. The projector is capable of projecting a sharp projected image with no blur on the entire projection surface.

  The projector 1002 according to the second embodiment has the same configuration as that of the projector 1000 according to the first embodiment except for the arrangement position of the one-dimensional scanning device. Therefore, among the effects of the projector 1000 according to the first embodiment. Has the relevant effect as it is.

[Embodiment 3]
FIG. 10 is a diagram for explaining a projector 1004 according to the third embodiment. FIG. 10A is a side view showing the optical system of the projector 1004, and FIG. 10B is a front view of the optical system of the projector 1004 as viewed from the projection optical system 600 side.
FIG. 11 is a diagram illustrating the principle that field curvature is compensated for by the projection optical system 600 according to the third embodiment. FIG. 11A is a diagram illustrating a state in which field curvature occurs due to scanning by the one-dimensional scanning device 400, and FIG. 11B illustrates a state in which field curvature occurs due to field curvature aberration of the projection optical system 600. FIG. 11C is a diagram illustrating a state where the projection optical system 600 compensates for the field curvature generated by the scanning of the one-dimensional scanning device 400.

  The projector 1004 according to the third embodiment basically has the same configuration as the projector 1000 according to the first embodiment, but the arrangement position of the one-dimensional scanning device is different from that of the projector 1000 according to the first embodiment. That is, in the projector 1004 according to the third embodiment, as illustrated in FIGS. 10 and 11, the one-dimensional scanning device 400 is disposed in the optical path between the three illumination devices and the relay optical system 300.

  As described above, the projector 1004 according to the third embodiment is different from the projector 1000 according to the first embodiment in the arrangement position of the one-dimensional scanning device, but the field curvature generated by the scanning of the one-dimensional scanning device 400, Since the field curvature generated by the field curvature aberration of the projection optical system 600 cancels each other, the field curvature is eliminated over the entire projection surface as in the case of the projector 1000 according to the first embodiment. This makes it possible to project a sharp projected image with no blur on the entire surface.

  The projector 1004 according to the third embodiment has the same configuration as the projector 1000 according to the first embodiment except for the arrangement position of the one-dimensional scanning device. Has the relevant effect as it is.

[Embodiment 4]
FIG. 12 is a diagram for explaining a projector 1006 according to the fourth embodiment. 12A is a side view showing the optical system of the projector 1006, and FIG. 12B is a front view of the optical system of the projector 1006 as viewed from the projection optical system 602 side.
FIG. 13 is a diagram illustrating a principle that field curvature is compensated by the relay optical system 302 according to the fourth embodiment. FIG. 13A is a diagram illustrating a state in which field curvature occurs due to scanning by the one-dimensional scanning device 400, and FIG. 13B illustrates a state in which field curvature occurs due to field curvature aberration of the relay optical system 302. FIG. 13C is a diagram illustrating a state in which the curvature of field generated by the scanning of the one-dimensional scanning device 400 is compensated by the relay optical system 302.

  The projector 1006 according to the fourth embodiment basically has the same configuration as that of the projector 1004 according to the third embodiment, except that the field curvature aberration is given to the relay optical system instead of the projection optical system. 3 is different from the projector 1004 according to the third embodiment. That is, in the projector 1006 according to the fourth embodiment, as shown in FIGS. 12 and 13, an aspheric lens that generates a curvature of field that compensates for a curvature of field generated by the scanning of the one-dimensional scanning device 400 is used. The relay optical system 302 provided is used. Accordingly, a normal projection optical system 602 having no field curvature aberration is used as the projection optical system.

The principle that field curvature is compensated for by the relay optical system 302 in the fourth embodiment will be described with reference to FIG.
When the normal relay optical system 300 is used, field curvature occurs on the intermediate image forming surface P as shown in FIG. For this reason, out-of-focus occurs at the peripheral portion of the projection surface, and it becomes difficult to project a sharp projection image without out-of-focus over the entire projection surface.
Therefore, in the fourth embodiment, in place of the normal relay optical system 300, relay optics having a field curvature aberration that generates a field curvature that compensates for a field curvature generated by scanning by the one-dimensional scanning device 400 is used. The system 302 is used (see FIG. 13B). For this reason, according to the projector 1006 according to the fourth embodiment, the field curvature generated by the scanning of the one-dimensional scanning device 400 and the field curvature generated by the field curvature aberration of the relay optical system 302 cancel each other. As shown in FIG. 13 (c), the curvature of field is eliminated over the entire projection surface, and it becomes possible to project a sharp projected image without defocusing over the entire projection surface.

  As described above, the projector 1006 according to the fourth embodiment is different from the projector 1004 according to the third embodiment in that the relay optical system has a field curvature aberration instead of the projection optical system, but one-dimensional scanning is performed. Since the curvature of field generated by the scanning of the apparatus 400 and the curvature of field generated by the field curvature aberration of the relay optical system 302 cancel each other, the entire projection surface is the same as in the case of the projector 1004 according to the third embodiment. Thus, it is possible to project a sharp projected image without defocusing over the entire projection surface.

  Note that the projector 1006 according to the fourth embodiment has the same configuration as the projector 1004 according to the third embodiment except that the relay optical system has a field curvature aberration instead of the projection optical system. It has the corresponding effect as it is among the effects of the projector 1004 according to the third embodiment.

[Embodiment 5]
FIG. 14 is a diagram for explaining a projector 1008 according to the fifth embodiment. FIG. 14A is a side view showing the optical system of the projector 1008, and FIG. 14B is a front view of the optical system of the projector 1008 as viewed from the projection optical system 604 side.
FIGS. 15 and 16 are diagrams illustrating the principle that field curvature is compensated by the relay optical system 304 and the projection optical system 604 according to the fifth embodiment. FIG. 15A is a diagram illustrating a state in which field curvature occurs due to scanning by the one-dimensional scanning device 400, and FIG. 15B illustrates a state in which field curvature occurs due to field curvature aberration of the relay optical system 304. FIG. 15C is a diagram illustrating a state in which the field curvature generated by the scanning of the one-dimensional scanning device 400 is compensated by the projection optical system 604. FIG. 16A is a schematic diagram showing the field curvature (lateral direction) caused by the field curvature aberration of the relay optical system 304, and FIG. 16B shows the result of scanning by the one-dimensional scanning device 400 (longitudinal direction). FIG. 16C is a schematic diagram showing how the field curvature occurs, and FIG. 16C is a schematic diagram showing how the field curvature is compensated by the projection optical system 604. In FIG. 16, optical elements not related to image formation (such as the dichroic prism 200) are not shown.

  The projector 1008 according to the fifth embodiment basically has the same configuration as that of the projector 1000 according to the first embodiment, except that the relay optical system and the projection optical system have predetermined field curvature aberration. 1 is different from the projector 1000 according to the first embodiment. That is, in the projector 1008 according to the fifth embodiment, as illustrated in FIGS. 14, 15, and 16, the relay optical system 304 has an image plane in the same direction as the curvature of field generated by scanning of the one-dimensional scanning device 400. The projection optical system 604 includes a field curvature generated by field curvature aberration of the relay optical system 304 and a field curvature generated by scanning of the one-dimensional scanning device 400. A rotationally symmetric aspherical lens that generates a field curvature that compensates for the above.

The principle that field curvature is compensated by the relay optical system 304 and the projection optical system 604 according to the fifth embodiment will be described with reference to FIGS. 15 and 16.
When the normal relay optical system 300 and projection optical system 602 are used, field curvature occurs on the intermediate image forming surface P as shown in FIG. For this reason, out-of-focus occurs at the peripheral portion of the projection surface, and it becomes difficult to project a sharp projection image without out-of-focus over the entire projection surface.
Therefore, in the fifth embodiment, as shown in FIGS. 15B and 15C, an image generated by scanning with the one-dimensional scanning device 410 instead of the normal relay optical system 300 and the projection optical system 602. The relay optical system 304 including a rotationally symmetric aspheric lens that generates a field curvature in the same direction as the surface curvature, the field curvature generated by the field curvature aberration of the relay optical system 304, and the scanning of the one-dimensional scanning device 400. A projection optical system 604 including a rotationally symmetric aspherical lens that generates a field curvature that compensates for any field curvature that occurs is provided. Therefore, according to the projector 1008 according to the fifth embodiment, the lateral field curvature (see FIG. 16A) generated by the field curvature aberration of the relay optical system 304 and the scanning of the one-dimensional scanning device 400 are performed. It is possible to generate a rotationally symmetric field curvature (see FIG. 16C) by combining the field curvature in the vertical direction (see FIG. 16B) generated by the above. As a result, it is possible to eliminate the curvature of field by using the projection optical system 604 including an easily available rotationally symmetric aspheric lens as the projection optical system. Also, as the relay optical system 304, since a field curvature due to field curvature aberration hardly occurs in a direction orthogonal to the direction in which the image of the one-dimensional laser light source array is arranged, an easily available rotationally symmetric aspheric lens is used. It is possible to use a relay optical system provided.

  As described above, the projector 1008 according to the fifth embodiment is different from the projector 1000 according to the first embodiment in that the relay optical system and the projection optical system are provided with a predetermined field curvature aberration. Since the field curvature generated by the scanning of the apparatus 400 and the field curvature generated by the field curvature aberration of the relay optical system 304 and the projection optical system 604 cancel each other, the same as in the projector 1000 according to the first embodiment. Further, the curvature of field is eliminated over the entire projection surface, and thus a projector capable of projecting a sharp projected image without defocusing over the entire projection surface.

  The projector 1008 according to the fifth embodiment has the same configuration as that of the projector 1000 according to the first embodiment except that the relay optical system and the projection optical system have predetermined curvature of field aberrations. Therefore, the projector 1000 according to the first embodiment has the corresponding effect as it is.

  As mentioned above, although this invention was demonstrated based on said embodiment, this invention is not limited to said embodiment. The present invention can be carried out in various modes without departing from the spirit thereof, and for example, the following modifications are possible.

(1) In each of the above embodiments, the one-dimensional scanning device 400 that performs one-dimensional scanning so that the projection image is scanned in the vertical direction on the projection surface is used. However, the present invention is not limited to this. It is not something. A one-dimensional scanning device that performs one-dimensional scanning so that a projected image is scanned laterally with respect to the projection surface may be used.

(2) In each of the above embodiments, a semiconductor laser having a rectangular light emitting region is used, but the present invention is not limited to this. For example, a semiconductor laser having a square light emitting region may be used.

(3) In the above embodiments, three lighting devices are used as the lighting device, but the present invention is not limited to this. Less than three illumination devices may be used as the illumination device, or more than three illumination devices may be used.

(4) In each of the above embodiments, the cross dichroic prism 200 is used as the color combining prism, but the present invention is not limited to this. Other types of prisms may be used as the color synthesis prism.

(6) In each of the above-described embodiments, the collimator lens arranged with the convex surface side facing each one-dimensional laser light source array is used, but the present invention is not limited to this. A collimator lens arranged with the plane side facing the one-dimensional laser light source array may be used.

(7) In each of the above embodiments, the one-dimensional scanning device 400 including a galvanometer mirror is used, but the present invention is not limited to this. For example, a one-dimensional scanning device composed of a polygon mirror may be used.

(8) In each of the above embodiments, an optical system in which the exit surface of each collimator lens and the intermediate image forming surface of the relay optical system are in an optically conjugate position is used. However, the present invention is not limited to this. It is not something. An optical system in which the incident surface of the collimator lens and the intermediate image forming surface of the relay optical system are in an optically conjugate position may be used.

(9) The present invention can be applied to a rear projection type projector that projects from a side opposite to the side that observes the projected image, even when applied to a front projection type projector that projects from the side that observes the projected image. Is also possible.

10R ... Red one-dimensional laser light source array, 20R ... Substrate, 30R ... Red laser light source, 10G ... Green one-dimensional laser light source array, 10B ... Blue one-dimensional laser light source array, 50R ... Red light collimator lens, 50G ... Green light Collimator lens for light, 50B ... collimator lens for blue light, 60 ... plano-convex lens, 62 ... incident surface, 64 ... surface of the incident surface, 66 ... exit surface, 100R ... red illumination device, 100G ... green illumination device, 100B ... Blue illumination device, 300, 302, 304 ... relay optical system, 400 ... one-dimensional scanning device, 410 ... mirror unit, 420 ... drive unit, 500 ... field lens, 600, 602, 604 ... projection optical system, 1000, 1002, 1004, 1006, 1008 ... projector, dR ... first direction in red illumination device, i ... light Image of the over area, P ... intermediate imaging plane, SCR ... screen

Claims (11)

An illumination device including a one-dimensional laser light source array having a plurality of laser light sources arranged one-dimensionally along a predetermined first direction and blinking according to image information;
A relay optical system for guiding light emitted from the illumination device;
A one-dimensional scanning device that scans light emitted from the illumination device so as to form a two-dimensional projection image on a projection plane;
A projection optical system that projects light emitted from the illumination device onto the projection plane,
At least one of the relay optical system and the projection optical system has a field curvature aberration that generates a field curvature that compensates for a field curvature generated by scanning of the one-dimensional scanning device. projector. The projector according to claim 1.
2. The projector according to claim 1, wherein the relay optical system includes an aspheric lens that generates a field curvature in a direction opposite to a field curvature generated by scanning of the one-dimensional scanning device. The projector according to claim 1.
The projector according to claim 1, wherein the projection optical system includes an aspheric lens that generates a field curvature in a direction opposite to a field curvature generated by scanning of the one-dimensional scanning device. The projector according to claim 1.
The relay optical system includes a rotationally symmetric aspherical lens that generates a field curvature in the same direction as a field curvature generated by scanning of the one-dimensional scanning device,
As the projection optical system, rotationally symmetric that generates curvature of field that compensates for both curvature of field caused by field curvature aberration of the relay optical system and curvature of field caused by scanning of the one-dimensional scanning device. A projector comprising an aspheric lens. The projector according to claim 4,
The projector according to claim 1, wherein the one-dimensional scanning device is arranged at the center of curvature of field curvature generated by field curvature aberration of the relay optical system. In the projector in any one of Claims 1-5,
The one-dimensional scanning device is a galvanometer mirror. The projector according to any one of claims 1 to 6,
The one-dimensional scanning device is arranged in an optical path between the relay optical system and an intermediate image forming surface of the relay optical system. The projector according to any one of claims 1 to 6,
The projector according to claim 1, wherein the one-dimensional scanning device is disposed in an optical path between an intermediate image forming surface of the relay optical system and the projection optical system. The projector according to any one of claims 1 to 6,
The one-dimensional scanning device is disposed in an optical path between the illumination device and the relay optical system. The projector according to any one of claims 1 to 9,
As the lighting device,
A red illumination device comprising: a red one-dimensional laser light source array having a plurality of red laser light sources; and a red light collimator lens that is disposed in proximity to the red laser light source and suppresses the spread of light from the red laser light source When,
A green illumination device comprising: a green one-dimensional laser light source array having a plurality of green laser light sources; and a green light collimator lens that is disposed in the vicinity of the green laser light source and suppresses the spread of light from the green laser light source When,
A blue illumination device comprising: a blue one-dimensional laser light source array having a plurality of blue laser light sources; and a blue light collimator lens disposed in the vicinity of the blue laser light source and suppressing the spread of light from the blue laser light source And three lighting devices
A color synthesizing prism that synthesizes each color light emitted from the three illumination devices;
The projector according to claim 1, wherein the color synthesizing prism is disposed in an optical path preceding the one-dimensional scanning device. The projector according to claim 10.
The color synthesis prism is a cross dichroic prism having a substantially X-shaped interface on which a dichroic film is formed,
Of the three lighting devices,
The illumination device that emits color light that passes through the substantially X-shaped interface is configured to emit color light composed of a p-polarized component,
An illumination device that emits colored light reflected by at least one of the substantially X-shaped interfaces is configured to emit colored light composed of an s-polarized component.