JP2006133260A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector which is compact in size and has a simple constitution and is capable of projecting a video, having a desired aspect ratio without distortions. <P>SOLUTION: The projector 100 is equipped with an optical part 12 emitting 1st modulated light L1 obtained by modulating light from a lamp 1, functioning as a light source part in accordance with a video signal Vin and having an aspect ratio of 4:3; and a reflecting mirror block 13, having a reflection mirror A reflecting the 1st modulated light having the aspect ratio of 4:3 in the aspect ratio kept as it is and reflecting mirrors B and C reflecting the 1st modulated light so as to change to modulated light, having a different aspect ratio of 16:9. The reflecting mirror block 13 reflects the 1st modulated light L1 from the optical part by any one of the reflecting mirrors A, B and C. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector for projecting a projected image by modulating light from a light source unit such as a lamp with an image signal that defines an image.

  The aspect ratio of the image projected by the projector is generally 4: 3 in terrestrial television broadcasting or 16: 9 corresponding to high-vision broadcasting, for example. Projectors are required to display images of these two types of aspect ratios using a light modulation element for modulating a video signal having one type of predetermined aspect ratio into a video. FIG. 6 is a business projector equipped with a liquid crystal light valve as a light modulation element having an aspect ratio of 4: 3, which is the same as that of a PC screen, assuming that a presentation is mainly performed on a PC (personal computer). FIG. 4 is an explanatory diagram when projecting a movie image having an aspect ratio of 16: 9 from a DVD (Digital Versatile Disk) player. In order to project a video signal having an aspect ratio of 16: 9 from the DVD player 61, the business projector 60 uses the horizontal width W of the 4: 3 liquid crystal light valve on the screen SC as a reference “16” in the vertical direction. H is reduced by providing a black screen B in the upper and lower parts of the vertical direction H to secure a ratio of “9”, thereby creating a small 16: 9 screen in the 4: 3 screen configuration.

  Thereby, a 16: 9 image can be projected, but since the black screen B is required, the resolution corresponding to the area corresponding to the black screen B is reduced. Further, since a little light is transmitted through the black screen B, the projected image is not completely black because the light is not completely transmitted. Further, the light emitted to the black screen B is not used for the projected image. There were problems such as a decrease in light use efficiency.

  In order to solve such a problem, for example, the projection light representing the projection image radiated from the light modulation element having an aspect ratio of 4: 3 is enlarged and reduced by changing the curvature of the reflecting surface having plasticity. A rear projector that can obtain a projected image with an aspect ratio of 16: 9 without degrading resolution or light utilization efficiency is disclosed in Patent Document 1.

JP 2001-51350 A

  However, since the rear projector of Patent Document 1 has a configuration in which the curvature of the reflecting surface having plasticity is changed by a plurality of air cylinders provided on the back surface of the reflecting surface, the reflecting surface is likely to be distorted, and the projected image is displayed. May be distorted. Moreover, since the enlarged projection light after radiated | emitted from a light modulation element is used, reflective surface itself will become large sized. Furthermore, a plurality of air cylinders for changing the curvature of the reflecting surface, a driving device for the air cylinder, and the like are necessary, and there is a problem that the configuration is complicated.

  In order to solve the above problems, an object of the present invention is to provide a projector that has a small and simple configuration and can project an image having a desired aspect ratio without distortion.

  In order to achieve the above object, a projector according to the present invention emits a modulated light having a predetermined aspect ratio obtained by modulating a light source unit that supplies light and light from the light source unit according to a video signal that defines an image. And an optical unit that magnifies the modulated light and emits it as projection light for projecting a projected image, and the projection unit emits the modulated light with a predetermined aspect ratio as it is. Or switching between different aspect ratios for injection.

According to this configuration, the projector can switch whether the projection light is emitted as the modulated light having a predetermined aspect ratio with the same aspect ratio or with a different aspect ratio.
Therefore, it is possible to provide a projector capable of projecting an image having a desired aspect ratio so as to be switchable.

  According to the projector of the present invention, the projection unit includes a reflecting mirror that reflects the modulated light having a predetermined aspect ratio with the same aspect ratio, and a reflecting mirror that reflects the modulated light by changing the modulated light to a different aspect ratio. A reflecting mirror block having a plurality of reflecting mirrors, wherein the reflecting mirror block reflects the modulated light from the optical unit by any one of the reflecting mirrors.

According to this configuration, since the projector includes the reflecting mirror block having a plurality of reflecting mirrors, unlike a conventional projector having a plastic reflecting surface that distorts the projected image due to distortion, each projector is distorted. Without reflecting the modulated light.
Furthermore, since the reflecting mirror block reflects the modulated light from the optical unit by any one of the plurality of reflecting mirrors, the reflecting light reflects the modulated light according to the aspect ratio of the selected reflecting mirror.
Accordingly, it is possible to provide a projector that can project an image having a desired aspect ratio without distortion.

  According to the projector of the present invention, the projection unit has a projection lens for enlarging the modulated light, and the reflecting mirror block is provided between the optical unit that emits the modulated light and the projection lens. Preferably it is.

According to this configuration, since the reflecting mirror block of the projector is provided between the optical unit and the projection lens, unlike the large reflecting surface of the conventional rear projector provided at the subsequent stage of the projection lens, the projector lens Any size that can reflect the modulated light before being enlarged is sufficient. Further, the aperture of the projection lens only needs to be large enough to allow the modulated light to enter.
Therefore, since the reflecting mirror block and the projection lens are small in size, the overall configuration of the projector including the reflecting mirror block and the projection lens can also be reduced in size.
Therefore, it is possible to provide a small projector that can project an image having a desired aspect ratio without distortion.

  The projector according to the present invention includes an operation unit for selecting a desired reflecting mirror from a plurality of reflecting mirrors of the reflecting mirror block, and when the reflecting mirror is selected by the operating unit, the selected reflecting mirror is changed to the optical unit. It is preferable to further include a reflecting mirror driving unit including an actuator that reflects the modulated light from the lens and moves the reflected light to a reflection position where the modulated light can enter the effective enlargement region of the projection lens.

According to this configuration, when the reflecting mirror is selected by the operation unit, the reflecting mirror driving unit moves the selected reflecting mirror to the reflecting position, so that the modulated light is reflected and projected by the selected reflecting mirror. Incident on the lens.
Therefore, it is possible to provide a projector capable of obtaining an image with an aspect ratio along the selected reflecting mirror.

  According to the projector according to the present invention, the reflecting mirror block is rotatably provided, and the plurality of reflecting mirrors are installed in the reflecting mirror block so that the reflecting mirror block is arranged to be switched to the reflecting position as the reflecting mirror block rotates. It is preferable that an actuator for rotating the reflecting mirror block is further installed in the reflecting mirror block.

According to this configuration, since the plurality of reflecting mirrors are installed in the reflecting mirror block so as to be replaced with the reflecting position with the rotation of the reflecting mirror block, each reflecting mirror is rotated by the reflecting mirror block by the actuator. The mirror moves to the reflection position. Therefore, the plurality of reflecting mirrors of the reflecting mirror block can be rotated to the reflecting position by the actuator.
Therefore, it is possible to provide a projector capable of projecting an image having a desired aspect ratio without distortion by a simple configuration of a reflecting mirror block that rotates and moves.

  According to the projector of the present invention, the optical unit has a light modulation element having a screen with a predetermined aspect ratio, and the video represented by the input video signal in the input video signal input from the external video signal supply source A video signal processing unit that performs video signal processing including processing for changing the aspect ratio of the input video signal so that the video represented by the input video signal matches the screen of the light modulation element. It is preferable that a second video signal is generated by performing video signal processing on the optical unit, and the optical unit emits modulated light corresponding to the second video signal.

  According to this configuration, the optical unit emits the modulated light according to the second video signal in which the video represented by the input video signal matches the screen of the light modulation element. Regardless of the aspect ratio of the displayed image, the modulated light always coincides with the screen of the light modulation element. Therefore, it is possible to provide a projector that can utilize the resolution of the light modulation element without waste.

  The projector according to the present invention further includes an identification unit that reads the aspect ratio information of the video specified by the identification signal included in the input video signal, and the identification unit reads the aspect ratio of the image projected by the projection light. A control unit that selects a reflecting mirror so that the aspect ratio of the image specified by the input video signal is the same, and issues a command to the reflecting mirror drive unit so that the selected reflecting mirror moves to the reflecting position. It is preferable.

  According to this configuration, the control unit selects the reflecting mirror so that the aspect ratio of the projected image is the same as the aspect ratio of the image read by the identifying unit, and the selected reflecting mirror comes to the reflection position. Since the command is issued to the reflecting mirror drive unit, the projector projects an image having the same aspect ratio as the aspect ratio of the image defined in the input image signal. Therefore, it is possible to provide a projector capable of obtaining a projected image having the same aspect ratio as the image specified in the input video signal.

  According to the projector of the present invention, the reflecting mirror block includes the plane mirror that reflects the modulated light having the aspect ratio of 4: 3 radiated by the optical unit with the same aspect ratio, and the 4: 3 aspect ratio of the modulated light. It is preferable to have a convex mirror that converts the light into modulated light having an aspect ratio of 16: 9 by enlarging the horizontal direction without changing the vertical direction.

  According to this configuration, the plane mirror reflects the modulated light having the aspect ratio of 4: 3 at the same aspect ratio, and the convex mirror reflects the modulated light having the aspect ratio of 4: 3 by the reflection to the aspect ratio of 16: 9. Convert to modulated light. Therefore, it is possible to provide a projector capable of projecting an image having an aspect ratio of 4: 3 or 16: 9 by selecting a reflecting mirror.

  According to the projector of the present invention, the reflector block is converted into modulated light having an aspect ratio of 16: 9 by reducing the vertical direction without changing the horizontal direction of the 4: 3 aspect ratio of the modulated light. It is preferable to further include a concave mirror.

According to this configuration, the concave mirror converts the modulated light having the aspect ratio of 16: 9 by reducing the vertical direction without changing the horizontal direction of the 4: 3 aspect ratio of the modulated light. Therefore, by selecting the concave mirror and the convex mirror, it is possible to obtain an image having an aspect ratio of 16: 9 having a different size of the projected image when the image is projected.
Therefore, it is possible to provide a projector that can select the size of an image according to the state of a screen to be projected.

  According to the projector according to the present invention, the reflecting mirror block includes a plane mirror that reflects the modulated light having the aspect ratio of 16: 9 emitted from the optical unit with the same aspect ratio, and the 16: 9 aspect ratio of the modulated light. It is preferable to have a convex mirror that converts the light into modulated light having an aspect ratio of 4: 3 by enlarging the vertical direction without changing the horizontal direction.

  According to this configuration, the plane mirror reflects the modulated light having the aspect ratio of 16: 9 with the same aspect ratio, and the convex mirror reflects the modulated light with the aspect ratio of 16: 9 by the reflection to the aspect ratio of 4: 3. Convert to modulated light. Therefore, it is possible to provide a projector capable of projecting an image having an aspect ratio of 16: 9 or 4: 3 by selecting a reflecting mirror.

  According to the projector of the present invention, the reflector block is converted into modulated light having an aspect ratio of 4: 3 by reducing the horizontal direction without changing the vertical direction of the 16: 9 aspect ratio of the modulated light. It is preferable to further include a concave mirror.

According to this configuration, the concave mirror converts the modulated light into the modulated light having the aspect ratio of 4: 3 by reducing the horizontal direction without changing the vertical direction of the 16: 9 aspect ratio of the modulated light. Thus, by selecting the concave mirror and the convex mirror, it is possible to obtain an image having an aspect ratio of 4: 3 with different sizes of the projected image when the image is projected.
Therefore, it is possible to provide a projector that can select the size of an image according to the state of a screen to be projected.

  According to the projector control method of the present invention, a light source unit that supplies light, and an optical unit that emits modulated light having a predetermined aspect ratio obtained by modulating light from the light source unit according to a video signal that defines an image A reflecting mirror block having a plurality of reflecting mirrors including a reflecting mirror that reflects the modulated light with the same aspect ratio and a reflecting mirror that reflects the modulated light by changing the aspect ratio to a different aspect ratio; A projector control method comprising: a projection unit that emits projection light for projecting light; and an identification unit that reads image aspect ratio information defined in an identification signal included in the video signal. The identification process for reading the aspect ratio information of the image specified in the signal and the aspect ratio of the image projected by the projection light are specified in the video signal read in the identification process. A reflecting mirror selecting step of selecting the reflecting mirror of the reflecting mirror block so as to be the same as the aspect ratio of the image, a reflecting step of reflecting the modulated light to the projection unit by the reflecting mirror selected in the reflecting mirror selecting step; It is preferable to contain.

According to this control method, in the reflector selection step, the reflector of the reflector block is selected so as to be the same as the aspect ratio of the image defined in the video signal read in the identification step, and in the reflection step, the selection is performed. Since the reflected mirror reflects the modulated light to the projection unit, the projector projects an image according to the aspect ratio of the image defined in the image signal.
Therefore, it is possible to provide a projector control method capable of obtaining a projected image having the same aspect ratio as that of the image defined in the input image signal.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
(Embodiment)

  FIG. 1 is a schematic configuration diagram of a projector according to an embodiment. First, a schematic configuration of the projector 100 will be described. The projector 100 receives a video signal Vin from a PC (personal computer) 40 or a video signal supply device 50 that is a DVD player, for example, and generates a projected video. The projector 100 separates the light emitted by the lamp 1 as a light source into three primary color components of red light, blue light, and green light, and a liquid crystal light valve 2R for each color light as a light modulation element for each color light. , 2G, 2B, a so-called “liquid crystal three-plate projector” that modulates the video signal in accordance with the video signal, synthesizes it again, and projects it onto the screen SC.

The projector 100 includes a lamp 1, liquid crystal light valves 2R, 2G, and 2B, a video converter 3, a video signal processing unit 4, a video correction unit 5, a liquid crystal panel driving unit 6, a remote control 7 as an operation unit, an operation receiving unit 8, a power supply The unit 9 includes a ballast 10, a control unit 11, an optical unit 12, a reflecting mirror block 13, a reflecting mirror driving unit 14, a projection lens 15, a stepping motor 20, a rotary encoder 21, and the like.
The lamp 1 is, for example, a discharge lamp capable of obtaining high brightness such as a high-pressure mercury lamp, a metal halide lamp, and a halogen lamp.
The liquid crystal light valve 2R is for red light, 2G is for green light, and 2B is for blue light. Both have an aspect ratio of 4: 3, and are included in the configuration of the optical unit 12 described later.

The video converter 3 performs A / D conversion on the analog RGB signal Vin input from the PC 40 and outputs it as a digital video signal Din. Also, for example, when a video player is connected as the video signal supply device 50, the composite signal that is an analog signal from the video player is combined by a decoder that incorporates it, converted into a component signal, A / D converted, and digitally Output as video signal Din.
The video converter 3 sends a synchronization signal of the input video signal Vin to the control unit 11 described later in order to identify the aspect ratio of the video represented by the input video signal Vin.

  The video signal processing unit 4 converts the video data into a frame memory (not shown) in order to make the digital video signal Din input from the video converter 3 suitable for display on the liquid crystal light valves 2R, 2G, and 2B. Video signal processing, such as writing to and reading under predetermined conditions. Video signal processing includes scaling processing that matches the resolution of the liquid crystal light valves 2R, 2G, and 2B by enlarging and reducing the video represented by the input video signal Din, and frame rate conversion that indicates the number of drawing updates per second. Is included. The input video signal Din is subjected to such video signal processing and is output as a digital video signal Dsc. Since the aspect ratio of the liquid crystal light valves 2R, 2G, and 2B is 4: 3, it is not necessary to change the aspect ratio when the aspect ratio of the video represented by the input video signal Din is 4: 3. When the aspect ratio of the video represented by the input video signal Din is 16: 9, video signal processing for enlarging the vertical direction is performed on the basis of the horizontal direction 16 and output as a video signal Dsc having an aspect ratio of 4: 3. .

The video correction unit 5 converts the gradation value of the video signal Dsc into a gradation value suitable for displaying on the liquid crystal light valves 2R, 2G, and 2B into the digital video signal Dsc from the video signal processing unit 4. Correction processing and color unevenness correction processing due to luminance unevenness inherent to the liquid crystal light valves 2R, 2G, and 2B are performed and output as a video signal Dout.
The liquid crystal panel driving unit 6 supplies the liquid crystal light valves 2R, 2G, and 2B with the video signal Dout input from the video correction unit 5, the driving voltage, and the like, and displays the images on the liquid crystal light valves 2R, 2G, and 2B.

  The remote control 7 as an operation unit includes a “power button” for starting / stopping the projector 100, a “screen mode switching button” for selecting an aspect ratio of a projected image, and a “cross button” for selecting various functions. , “Video source switching button” for switching the input video signal, “Screen mode automatic selection button” for matching the aspect ratio of the projected video with the aspect ratio of the input video signal, “Determination button” for determining the selected function, etc. A plurality of buttons (all not shown) for operating the projector 100 are provided. The projector 100 can be operated by a plurality of operation switches (not shown) provided on the exterior surface of the projector 100 in addition to the remote controller 7.

When various operations are performed on the remote controller 7, the operation receiving unit 8 receives an infrared signal from the remote controller 7, and sends operation signals that trigger various operations to the control unit 11 described later.
The power source unit 9 is stabilized by guiding the AC power from the external power source 19 from the plug, and performing transformation, rectification, and smoothing by a built-in AC / DC conversion unit (both not shown). A DC voltage is supplied to each part of the projector 100.
The ballast 10 is supplied with power from the power supply unit 9 and generates a high voltage to turn on the discharge lamp 1 to form a discharge path, and maintains a stable lighting state after lighting. A ballast circuit (none of which is shown).

The control unit 11 is an MCU (Micro Controller Unit) and includes a storage unit (not shown) therein. In the storage unit configured from a non-volatile memory such as a flash memory, for example, a startup program for starting up the projector 100 and movement position data of the reflector block 13 corresponding to a selected aspect ratio at the time of screen mode switching described later are used. Various operation programs such as the above, and setting data are stored. The control unit 11 exchanges signals with each unit via a bus line indicated by a white bidirectional arrow in FIG. 1, and also operates according to an operation signal from the operation receiving unit 8. To control.
The control unit 11 manages, for example, an OSD (On-Screen Display) function for displaying an input video source selection status, an operation status by various operations, and the like superimposed on a projected video. For example, when an operation signal is input from the operation receiving unit 8 by operating the remote controller 7 or the like, an OSD command is sent to the video signal processing unit 4 according to the operation content, and characters such as “input: PC1” are superimposed on the projected image. . The fixed character information to be superimposed on the projected image is stored in a built-in storage unit.
Further, the control unit 11 measures the frequency of the synchronizing signal of the input video signal Vin from the video converter 3 using a built-in counter or the like, and identifies the aspect ratio of the input video signal by referring to the aspect ratio table of the storage unit. It also functions as an identification unit.

  The optical unit 12 separates white light emitted from the lamp 1 into substantially parallel light having a stable luminance distribution, and separates the white light into red, green, and blue color light components that are the three primary colors of light. In addition, a separation optical system (not shown) that supplies the liquid crystal light valves 2R, 2G, and 2B for each color light, and the liquid crystal light valves 2R, 2G, and 2B modulate each color light according to the video signal Dout. And a combining optical system that combines the respective color lights again. Since the integrator optical system and the separation optical system are not the gist of the present invention, detailed description thereof is omitted. The modulated light for each color light from the liquid crystal light valves 2R, 2G, and 2B includes a dichroic film 17 that reflects blue light and transmits green light, and a dichroic film 18 that reflects red light and transmits green light. The light is combined by a cross dichroic prism 16 as a combining optical system, and is emitted as a substantially parallel modulated light L1 in a full color modulated in accordance with the video signal Dout.

  The reflecting mirror block 13 includes a reflecting mirror A, a reflecting mirror B, and a reflecting mirror C. FIG. 1 shows a state in which the reflecting mirror A of the reflecting mirror block 13 is selected. The reflecting surface of the reflecting mirror A reflects the modulated light L1 from the optical unit 12, and the reflected modulated light L1 will be described later. It is installed at a reflection position M where it can enter the effective enlargement area of the projection lens 15. The reflecting mirror block 13 is provided so as to be rotatable about the rotation center P, and the center of each reflecting surface of the reflecting mirror A, reflecting mirror B, and reflecting mirror C is moved to the reflecting position M by rotating. Let The center of the reflection surface, which is the center of the screen represented by the modulated light L1 reflected by the reflection mirror A, coincides with the reflection position M. The reflecting mirror A is arranged in the reflecting mirror block 13 so that a line connecting the center of the reflecting surface of the reflecting mirror A and the rotation center P of the reflecting mirror block 13 becomes one of the radiation from the rotation center P. . The reflecting mirror A is a plane mirror, reflects the modulated light L1 having an aspect ratio of 4: 3 from the optical unit 12 with the same aspect ratio, and emits it to the projection lens 15. The reflection angle α at which the reflecting mirror A reflects the light beam of the modulated light L1 is about 90 °.

Hereinafter, in addition to FIG. 1, it demonstrates using FIG. 2 and FIG. 3 suitably. FIG. 2 is an explanatory diagram of the operation of the reflecting mirror B when the reflecting mirror B of the reflecting mirror block 13 is selected. FIG. 3 is an explanatory diagram of the operation of the reflecting mirror C when the reflecting mirror C of the reflecting mirror block 13 is selected.
The reflecting mirror B is a convex mirror, and the modulated light L1 having an aspect ratio of 4: 3 from the optical unit 12 is expanded in the horizontal direction without changing the vertical direction, as shown in FIG. The ratio is converted into the modulated light L2. In FIG. 2, the image V1 represented by the modulated light L1 and the image V2 represented by the modulated light L2 are shown. Hereinafter, the video V2 converted by the reflecting mirror B is referred to as “screen mode 16: 9, B mode”. The center of the video V2 represented by the modulated light L2 reflected by the reflecting mirror B coincides with the reflection position M. The reflector B is arranged in the reflector block 13 so that a line connecting the center of the image V2 of the reflector B and the rotation center P of the reflector block 13 becomes one of the radiation from the rotation center P. . The reflection angle α at which the reflecting mirror B reflects the light beam of the modulated light L1 is about 90 °.

  The reflecting mirror C is a convex mirror, and the modulated light L1 having an aspect ratio of 4: 3 from the optical unit 12 is reduced in the vertical direction without changing the horizontal direction, as shown in FIG. The ratio is converted into the modulated light L3. In FIG. 3, a video V1 represented by the modulated light L1 and a video V3 represented by the modulated light L3 are shown. Hereinafter, the video V3 converted by the reflecting mirror C is referred to as “screen mode 16: 9, C mode”. The center of the image V3 represented by the modulated light L3 reflected by the reflecting mirror C coincides with the reflection position M. The reflecting mirror C is arranged on the reflecting mirror block 13 so that a line connecting the center of the image V3 of the reflecting mirror C and the rotation center P of the reflecting mirror block 13 becomes one of the radiation from the rotation center P. . The reflection angle α at which the reflecting mirror C reflects the light flux of the modulated light L1 is about 90 °.

  Although “screen mode 16: 9, B mode” and “screen mode 16: 9, C mode” can be selected, an image with an aspect ratio of 16: 9 can be obtained. Select the preferred one according to the projection environment. This will be described with reference to FIGS. 2, 3 and 6. In FIG. 6, the projector 60 will be described as 100. For example, as an installation state of the projector 100, the projector 100 is fixedly installed on the ceiling of the conference room, and as a projection environment, a screen SC having an aspect ratio of 4: 3 is installed on the wall surface of the conference room.

  The position of the screen SC is set at a distance D from the projector 100 so that the screen surface can be fully used when the projector 100 projects an image with an aspect ratio of 4: 3. Under such circumstances, when “screen mode 16: 9, B mode” is selected, the modulated light L2 is enlarged in the horizontal direction W, so that the video V2 is a video in which the horizontal side protrudes from the screen SC. End up. The zoom function of the projection lens 15 to be described later can be adjusted to fit within the screen SC. However, if the zoom function or the like is a manual operation, a troublesome adjustment operation such as reaching up to the ceiling with a stepladder or the like must be performed. I must. Here, when “screen mode 16: 9, C mode” is selected, the modulated light L3 is reduced in the vertical direction H with respect to the horizontal direction W, so that the video V3 does not protrude from the screen SC. Fits in. Further, since the zoom and focus settings of the projection lens 15 when the reflecting mirror A is selected and an image with an aspect ratio of 4: 3 is being projected can be used as they are, no troublesome adjustment operation is required.

  Returning to FIG. For example, the reflecting mirror A forms a reflecting surface by sputtering a metal such as silver or aluminum having a high reflectance on the surface of a synthetic resin having a flat surface to provide a uniform thin film layer. For example, the reflecting mirror B and the reflecting mirror C are configured by forming a uniform thin film layer by sputtering a metal such as silver or aluminum having a high reflectance on the surface of a synthetic resin having a desired uneven surface. is doing. The reflecting mirrors A, B, and C each have a fixed plane or curved surface, so that the modulated light L1 is always reflected by a reflecting surface having a constant flatness or curvature.

  The reflecting mirror A, the reflecting mirror B, and the reflecting mirror C are installed so that the centers of the respective reflecting surfaces are equiangular β with the rotation center P of the reflecting mirror block 13 as the center. The angle β is about 120 °. A stepping motor 20 as an actuator for rotating the reflecting mirror block 13 around the rotation center P is connected to the reflecting mirror block 13. A rotary encoder 21 for detecting the rotation angle of the stepping motor 20 is connected to the stepping motor 20. The rotation signal R detected by the rotary encoder 21 is input to the I / O port of the control unit 11.

The reflecting mirror driving unit 14 rotates the reflecting mirror block 13 by supplying a driving pulse to the stepping motor 20 connected to the reflecting mirror block 13 in accordance with an instruction from the control unit 11.
The projection lens 15 is composed of a convex lens or the like, and expands the modulated light L1 to L3 from the reflecting mirror block 13 with the same aspect ratio as projection light, and projects an image on the screen SC. The projection lens 15 has a zoom function for adjusting the magnification of the projection light and a focus function for adjusting the focus of the projection light.

  Next, the flow of the “aspect ratio manual setting” process for manually setting the aspect ratio of the image projected by the projector 100 will be described with reference to FIG. 1 and FIG. FIG. 4 is a flowchart for manually setting the aspect ratio. The projector 100 is connected to a PC 40 and a DVD player as the video signal supply device 50. The video signal Vin for presentation having an aspect ratio of 4: 3 is input from the PC 40, and 16: 9 is input from the DVD player. The movie's Vin is entered. First, as an initial state, the projector 100 projects an image represented by a video signal Vin for presentation having a 4: 3 aspect ratio from the PC 40 with an aspect ratio of 4: 3. The flow of switching to the 16: 9 B mode by operation will be described.

In step S <b> 1, the control unit 11 determines whether or not the “screen mode switching button” of the remote controller 7 is operated based on an operation signal from the operation receiving unit 8. When there is no operation of the “screen mode switching button”, the operation of the “screen mode switching button” is continuously waited. When the operation of the “screen mode switching button” is performed, the process proceeds to step S2.
In step S2, since the operation of the “screen mode switching button” has been performed, the control unit 11 causes the OSD function to superimpose a display “screen mode 4: 3?” On the projected presentation video. The process proceeds to step S3.

In step S <b> 3, the control unit 11 again determines whether or not the “screen mode switching button” is operated based on the operation signal from the operation receiving unit 8. The “screen mode switching button” cycles through “screen mode 4: 3”, “screen mode 16: 9, B mode”, “screen mode 16: 9, C mode”, and no display according to the number of operations. Switch. Here, since the operation of the “screen mode switching button” has been performed, the process proceeds to step S4.
In step S4, since the operation of the “screen mode switching button” has been performed, the control unit 11 superimposes the display “screen mode 16: 9, B mode?” On the projected presentation video by the OSD function. Display, and the process proceeds to step S5.
In step S <b> 5, whether or not the “screen mode switching button” is operated is determined based on an operation signal from the operation receiving unit 8. Here, since the operation of the “screen mode switching button” has not been performed, the process proceeds to step S6.

In step S <b> 6, the control unit 11 determines whether or not the “decision button” is operated based on an operation signal from the operation receiving unit 8. If the “OK” button is not operated for a certain time (for example, 30 seconds), the aspect ratio manual setting mode is exited and the initial state is restored. Here, since the “OK” button operation has been performed, the process proceeds to step S7.
In step S7, the control unit 11 determines whether or not the currently selected aspect ratio is the same as the “screen mode 16: 9, B mode” selected in step S6. The control unit 11 reflects the rotation signal R from the rotary encoder 21 that detects the rotation angle of the reflecting mirror block 13 and the movement position data of the reflecting mirror block 13 of the built-in storage unit at the reflection position M. Identify the mirror. If the identified reflecting mirror is the reflecting mirror B, it is the same as the current setting, so that it returns to the initial state and continues projection in the screen mode as it is. Here, since the currently selected aspect ratio is 4: 3, which is different from the “screen mode 16: 9, B mode”, the process proceeds to step S8.

In step S8, the control unit 11 reads movement data for setting the reflecting mirror B at the reflection position M in order to set “screen mode 16: 9, B mode” from the built-in storage unit, and proceeds to step S9. .
In step S9, the control unit 11 sends a driving command for setting the reflecting mirror B to the reflecting position M to the reflecting mirror driving unit 14, drives the stepping motor 20 connected to the reflecting mirror block 13, and reflects the reflecting mirror B. Is set at the reflection position M. As a result, the projected image has an aspect ratio of 16: 9. Here, when the “video source switching button” of the remote controller 7 is operated, the input video signal is switched, and the presentation video is switched to a movie video with an aspect ratio of 16: 9.

Next, a flow of switching from the state in which the projector 100 projects a movie image in the “screen mode 16: 9, B mode” to the “screen mode 16: 9, C mode” by manual operation will be described.
Since the description from step S1 to step S4 is the same as the “screen mode 16: 9, B mode” selection process, it will be described from step S5.

In step S <b> 5, the control unit 11 determines whether or not the “screen mode switching button” is operated based on an operation signal from the operation receiving unit 8. Here, since the operation of the “screen mode switching button” has been performed, the process proceeds to step S10.
In step S10, since the operation of the “screen mode switching button” has been performed, the control unit 11 superimposes the display “screen mode 16: 9, C mode?” On the projected presentation image by the OSD function. Display, and the process proceeds to step S11.
In step S <b> 11, the control unit 11 again determines whether or not the “screen mode switching button” is operated based on the operation signal from the operation receiving unit 8. When the “screen mode switching button” is operated, the aspect ratio manual setting mode is exited and the initial state is restored. Here, since the operation of the “screen mode switching button” has not been performed, the process proceeds to step S12.

In step S <b> 12, the control unit 11 determines whether or not the “decision button” has been operated based on an operation signal from the operation receiving unit 8. If the “OK” button is not operated for a certain time (for example, 30 seconds), the aspect ratio manual setting mode is exited and the initial state is restored. Here, since the “OK” button operation has been performed, the process proceeds to step S13.
In step S13, the control unit 11 determines whether or not the currently selected aspect ratio is the same as the “screen mode 16: 9, C mode” selected in step S12. The control unit 11 reflects the rotation signal R from the rotary encoder 21 that detects the rotation angle of the reflecting mirror block 13 and the movement position data of the reflecting mirror block 13 of the built-in storage unit at the reflection position M. Identify the mirror. If the identified reflecting mirror is the reflecting mirror C, it is the same as the current setting, so that it returns to the initial state and continues projection in the screen mode as it is. Here, since the currently selected aspect ratio is “screen mode 16: 9, B mode”, which is different from “screen mode 16: 9, C mode”, the process proceeds to step S14.

In step S14, the control unit 11 reads movement data for setting the reflecting mirror C at the reflection position M in order to set “screen mode 16: 9, C mode” from the built-in storage unit, and proceeds to step S15. .
In step S15, the control unit 11 sends a drive command for setting the reflecting mirror C to the reflecting position M to the reflecting mirror driving unit 14, drives the stepping motor 20 connected to the reflecting mirror block 13, and the reflecting mirror C. Is set at the reflection position M. Thereby, the projected image becomes “screen mode 16: 9, C mode”.

Next, a flow of switching from the state in which the projector 100 projects a movie image in “screen mode 16: 9, C mode” to “screen mode 4: 3” by manual operation will be described.
Since the description from step S1 to step S2 is the same as the “screen mode 16: 9, B mode” selection process, it will be described from step S3.

In step S <b> 3, the control unit 11 determines whether or not the “screen mode switching button” is operated based on an operation signal from the operation receiving unit 8. Here, since the operation of the “screen mode switching button” has not been performed, the process proceeds to step S16.
In step S <b> 16, the control unit 11 determines whether or not the “decision button” is operated based on an operation signal from the operation receiving unit 8. If the “OK” button is not operated for a certain time (for example, 30 seconds), the aspect ratio manual setting mode is exited and the initial state is restored. Here, since the “OK” button operation has been performed, the process proceeds to step S17.

  In step S17, the control unit 11 determines whether or not the currently selected aspect ratio is the same as the “screen mode 4: 3” selected in step S16. The control unit 11 reflects the rotation signal R from the rotary encoder 21 that detects the rotation angle of the reflecting mirror block 13 and the movement position data of the reflecting mirror block 13 of the built-in storage unit at the reflection position M. Identify the mirror. If the identified reflecting mirror is the reflecting mirror A, it is the same as the current setting, so that it returns to the initial state and continues projection in the screen mode as it is. Here, since the currently selected aspect ratio is “screen mode 16: 9, B mode” and is different from “screen mode 4: 3”, the process proceeds to step S18.

In step S18, the control unit 11 reads movement data for setting the reflecting mirror A at the reflection position M in order to set “screen mode 4: 3” from the built-in storage unit, and proceeds to step S19.
In step S19, the control unit 11 sends a drive command for setting the reflecting mirror A to the reflecting position M to the reflecting mirror driving unit 14, drives the stepping motor 20 connected to the reflecting mirror block 13, and reflects the reflecting mirror A. Is set at the reflection position M. As a result, the projected image has an aspect ratio of 4: 3. Here, when the “video source switching button” on the remote controller 7 is operated, the input video signal is switched, and the movie video is switched to the presentation video.

  Next, referring to FIGS. 5 and 1, the control unit 11 controls the “screen mode automatic selection” to control the aspect ratio of the image projected by the projector 100 to be the same as the aspect ratio of the selected video signal. The process will be described. FIG. 5 is a flowchart of the screen mode automatic selection process.

  As an initial setting at the time of shipment from the factory, “screen mode automatic selection” is selected so that the projector 100 has the same aspect ratio between the input video signal and the projected video. The “screen mode automatic selection” is canceled when a predetermined screen mode is selected by the “aspect ratio manual setting” process. The screen mode set in “Aspect Ratio Manual Setting” is stored in the storage unit in the control unit 11 when the projector 100 is terminated by the “power button” operation, and is stored in the next startup. Screen mode is reproduced. By operating the “screen mode automatic selection button” in the operating state of the projector 100 in which the predetermined screen mode is selected by the “aspect ratio manual setting”, the screen returns to “screen mode automatic selection”. Here, “screen mode automatic selection” is selected for the projector 100, and the “screen mode 16: 9, B mode” is selected from the state where the PC 40 projects a presentation image with an aspect ratio of 4: 3. A case of switching to a movie image from a DVD player will be described.

In step S <b> 20, the control unit 11 determines whether or not the “video source switching button” of the remote controller 7 is operated based on the operation signal from the operation receiving unit 8. If the operation of the “video source switching button” is not performed, the operation of the “video source switching button” is continued. In this case, since the “video source switching button” has been operated, the process proceeds to step S21.
In step S21, the control unit 11 sends a switching command to the video converter 3, and switches the video signal from the PC video signal to the DVD player video signal Vin. Further, the display “input: component video” is superimposed on the projected image by the OSD function.
In step S22, the control unit 11 as an identification unit identifies the aspect ratio of the video signal Vin from the frequency of the synchronizing signal of the video signal Vin of the DVD player from the video converter 3 and the aspect ratio table of the built-in storage unit. .

In step S <b> 23, the control unit 11 determines whether or not the identified aspect ratio is the same as the currently selected aspect ratio “screen mode 4: 3”. The control unit 11 reflects the rotation signal R from the rotary encoder 21 that detects the rotation angle of the reflecting mirror block 13 and the movement position data of the reflecting mirror block 13 of the built-in storage unit at the reflection position M. Identify the mirror. When the identified reflecting mirror is the reflecting mirror A, it is the same as the current setting, so the projection is continued in the screen mode as it is. Here, since the identified aspect ratio is “16: 9”, which is different from “screen mode 4: 3”, the process proceeds to step S24.
In step S24, the control unit 11 reads movement data for setting the reflecting mirror B at the reflection position M in order to set “screen mode 16: 9, B mode” from the built-in storage unit, and proceeds to step S25. .
In step S25, the control unit 11 sends a drive command for setting the reflecting mirror B to the reflecting position M to the reflecting mirror driving unit 14, drives the stepping motor 20 connected to the reflecting mirror block 13, and reflects the reflecting mirror B. Is set at the reflection position M. As a result, the projected image has an aspect ratio of 16: 9.

  In this “screen mode automatic selection” process, the screen mode selected by the control unit 11 is either “4: 3” by the reflector A or “screen mode 16: 9, B mode” by the reflector B. The default setting was to select one or the other. This setting can be changed by operating the operation unit such as the remote controller 7. However, since “screen mode 16: 9” has two modes with the same aspect ratio, “screen mode 16: : 9, B mode "or" Screen mode 16: 9, C mode "is selected.

  As described above, according to the present embodiment, the following effects can be obtained.

  (1) The projector 100 reflects the first modulated light L1 having an aspect ratio of 4: 3, thereby changing to the second modulated lights L2 and L3 having different aspect ratios 16: 9. Since the reflecting mirror block 13 having C is provided, the modulated light is reflected without distortion by a fixed reflecting surface, unlike a conventional projector having a plastic reflecting surface in which a projected image is distorted due to distortion. Further, since the reflecting mirror block 13 reflects the first modulated light L1 from the optical unit 12 by any one of the reflecting mirrors A, B, and C, the first modulated light having a predetermined aspect ratio. L1 is converted into second modulated light L1 or L2 or L3 corresponding to the aspect ratio of the selected reflector. Therefore, by selecting the reflecting mirrors A, B, and C, the second modulated light L1 or L2 or L3 having a desired aspect ratio can be obtained. Therefore, it is possible to provide the projector 100 that can project an image having a desired aspect ratio without distortion.

  (2) The projector 100 includes the reflecting mirror block 13 between the optical unit 12 that emits the first modulated light L1 and the projection lens 15 that expands the second modulated light L1, L2, and L3. Unlike a conventional rear projector in which a large reflecting surface is provided at the rear stage of the projection lens, the reflector block 13 has a size capable of reflecting the first modulated light L1 of substantially parallel light before being magnified by the projection lens 15. I just need it. Therefore, the size of the reflecting mirror block 13 can be reduced. Further, since the projection lens 15 expands the second modulated light L1, L2, L3 of substantially parallel light, the aperture of the projection lens 15 is large enough to allow the second modulated light L1, L2, L3 to enter. I just need it. Therefore, since the size of the projection lens 15 can be reduced, the overall configuration of the projector 100 including the reflector block 13 and the projection lens 15 that can be reduced in size can also be reduced.

  (3) In the “aspect ratio manual setting” process, when a reflecting mirror is selected by operating the remote controller 7 as the operating unit, the reflecting mirror driving unit 14 selects the reflecting mirror selected by the drive command from the control unit 11. Since it is moved to the reflection position M, the first modulated light L1 is reflected by the selected reflecting mirror, converted into the second modulated light, and enters the projection lens 15. Therefore, it is possible to provide the projector 100 that can select an image having a desired aspect ratio.

  (4) In the reflecting mirrors A, B, and C of the reflecting mirror block 13, the line connecting the reflecting center of each reflecting surface and the rotation center P overlaps with one of the radiations emitted from the rotating center of the reflecting mirror block 13. Therefore, the reflecting mirrors A, B, and C can be exchanged and moved to the reflection position M by the rotation of the stepping motor 20. Further, when each of the reflecting mirrors A, B, and C is disposed at the reflection position M, the reflection angle α of each reflecting mirror becomes the same at 90 °, and the modulated light L1 reflected by each reflecting mirror , L2 and L3 are substantially parallel lights, so that one projection lens 15 can project an image represented by a plurality of modulated lights. Accordingly, it is possible to provide a projector 100 that can project an image having a desired aspect ratio without distortion by rotating the reflecting mirror block 13.

  (5) In the “screen mode automatic selection” process, the control unit 11 reads the aspect ratio of the video represented by the input video signal Vin from the frequency of the synchronization signal of the input video signal Vin, and reads the aspect ratio of the projected video. Select the reflector so that it has the same aspect ratio as the projected image. Furthermore, since the driving command is issued to the reflecting mirror driving unit 14 so that the selected reflecting mirror is at the reflecting position M, the projector 100 has an image with the same aspect ratio as the aspect ratio of the image defined in the input image signal Vin. Is projected. Therefore, it is possible to provide the projector 100 that can obtain a projected image having the same aspect ratio as that of the image defined in the input video signal Vin.

  (6) The reflector block 13 is a reflector A that reflects the modulated light L1 having an aspect ratio of 4: 3 at the same aspect ratio, and the horizontal direction is expanded without changing the aspect ratio of 4: 3. Reflector B that converts the light into 16: 9 modulated light L2 and the mirror that converts it into 16: 9 modulated light L3 by reducing the vertical direction without changing the horizontal direction of the aspect ratio of 4: 3. Therefore, the projector 100 can project an image having a desired aspect ratio by selecting the reflecting mirror of the reflecting mirror block 13. Accordingly, it is possible to provide the projector 100 that can project an image having a desired aspect ratio.

  (7) The modulated light L1 is displayed on the screens of the liquid crystal light valves 2R, 2G, and 2B by the video signal processing in the video signal processing unit 4 even when the aspect ratio of the video represented by the input video signal Vin is 16: 9. Since the matched modulated light having an aspect ratio of 4: 3 is emitted from the optical unit 12, the resolution of the liquid crystal light valves 2R, 2G, and 2B can be effectively used without waste. Furthermore, since it is not necessary to project the black screen B shown in FIG. 6 on the liquid crystal light valves 2R, 2G, and 2B in order to project an aspect ratio of 16: 9, an image due to slight light transmission on the black screen B. There is no sense of incongruity, and the black screen B does not cause a decrease in light use efficiency.

  It should be noted that the present invention can add various changes and improvements to the above-described embodiment. A modification will be described below.

(Modification 1)
This will be described with reference to FIG. The projector 100 includes the liquid crystal light valves 2R, 2G, and 2B having an aspect ratio of 4: 3, but is not limited thereto. For example, the aspect ratio of the liquid crystal light valves 2R, 2G, and 2B may be 16: 9. In the case of this configuration, the reflecting mirror block 13 obtains an aspect ratio of 4: 3 by expanding the vertical direction without changing the aspect ratio of 16: 9 with the reflecting mirror A having a flat reflecting surface. A convex reflecting mirror and a concave reflecting mirror that converts to 4: 3 by reducing the horizontal direction without changing the vertical direction of the aspect ratio of 16: 9 are provided. When an input video signal Vin having an aspect ratio of 4: 3 is input, the video signal processing unit 4 performs video processing for enlarging the horizontal direction without changing the vertical direction on the video signal Vin, thereby producing a liquid crystal light valve. Use the resolution of the without waste.

  According to this configuration, the projector 100 can project an image having a desired aspect ratio by selecting the reflecting mirror of the reflecting mirror block 13 even if the projector 100 includes a liquid crystal light valve having an aspect ratio of 16: 9. Further, when a video signal Vin having an aspect ratio of 16: 9 is input, it is not necessary to perform video signal processing that matches the aspect ratio of the liquid crystal light valve, such as enlargement, in the video signal processing unit 4. It is possible to project a faithful image defined by the image signal Vin having a ratio.

(Modification 2)
The projector 100 includes the liquid crystal light valves 2R, 2G, and 2B for red light, blue light, and green light, but is not limited thereto. For example, the light modulation element of the projector 100 has a configuration using a single-plate liquid crystal light valve having the same number of liquid crystal cells as the resolution for each color light in which red, blue, and green color filters are regularly arranged in a grid pattern. There may be. Further, a configuration using a reflective liquid crystal display device or a tilt mirror device may be used. Even if it is these structures, the effect similar to Embodiment 1 can be acquired.

(Modification 3)
The present invention can also be applied to, for example, a rear projector that includes an optical system substantially similar to a projection projector and projects a projected image from the back onto a transmissive screen provided in the same individual. In this case, since the size of the screen is fixed, for example, when the image is projected by the reflecting mirror B of the reflecting mirror block 13 in FIG. 1, the image protrudes in the horizontal direction of the screen. The reflecting mirror A and the reflecting mirror C are used. With this configuration, substantially the same effect as in the first embodiment can be obtained.

(Modification 4)
This will be described with reference to FIG. In the above-described embodiment, the modulated light L1 is reflected by the plurality of reflecting mirrors B and C, whereby the aspect ratio is converted. However, the present invention is not limited to this configuration. For example, the projection lens 15 is provided on an extension line of the modulated light L1 emitted from the optical unit 12, and an anamorphic lens that reduces the image represented by the modulated light L1 in one direction between the optical unit 12 and the projection lens 15. It is good also as a structure which provides. The anamorphic lens, for example, converts it into modulated light having an aspect ratio of 16: 9 by reducing the vertical direction without changing the horizontal direction of the aspect ratio 4: 3 of the modulated light L1. The anamorphic lens can be manufactured by molding or polishing, and thus has a uniform and smooth surface.
According to this configuration, the modulated light L1 having the aspect ratio of 4: 3 can be incident on the projection lens 15 as the modulated light having no distortion of the aspect ratio of 16: 9 by the anamorphic lens. Further, by providing a plurality of anamorphic lenses having different reduction ratios or enlargement ratios so as to be interchangeable, it is possible to convert the modulated light L1 into a desired aspect ratio.
Therefore, it is possible to provide a projector that projects an image with a desired aspect ratio without distortion.

1 is a schematic configuration diagram of a projector according to an embodiment. Explanatory drawing about the effect | action of the reflective mirror B. FIG. Explanatory drawing about the effect | action of the reflective mirror C. FIG. The flowchart of screen mode manual operation processing. Chart of screen mode automatic setting processing. Explanatory drawing explanatory drawing by the conventional projector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lamp as light source part, 2R, 2G, 2B ... Liquid crystal light valve for each color light as light modulation element, 3 ... Video converter, 4 ... Video signal processing part, 5 ... Video correction part, 6 ... Liquid crystal panel drive part , 7: Remote control as an operation unit, 8: Operation receiving unit, 9: Power supply unit, 10: Ballast, 11: Control unit (or identification unit), 12: Optical unit, 13: Reflector block, 14: Reflector drive , 15 ... projection lens, 16 ... cross dichroic prism, 17, 18 ... dichroic film, 19 ... external power supply, 20 ... stepping motor as actuator, 21 ... rotary encoder, A ... plane mirror as reflector, B ... reflector Convex mirror as C, concave mirror as reflector, L1, L2, L3 ... modulated light, M ... reflection position, P ... center of rotation of reflector block, R ... rotation signal, α Reflection angle, Vin, Din, Dsc, Dout ... video signal, 40 ... PC, 50 ... video signal supply apparatus, 100 ... projector.

Claims (12)

A light source unit for supplying light;
An optical unit that emits modulated light having a predetermined aspect ratio obtained by modulating light from the light source unit according to a video signal that defines a video;
A projection unit that expands the modulated light and emits it as projection light for projecting a projected image;
The projection unit can switch whether the projection light is emitted with the modulated aspect ratio having a predetermined aspect ratio as it is, or changed to a different aspect ratio. projector. The projection unit
A reflecting mirror block having a plurality of reflecting mirrors including a reflecting mirror that reflects the modulated light having a predetermined aspect ratio with the same aspect ratio and a reflecting mirror that reflects the modulated light by changing it to a different aspect ratio; ,
The projector according to claim 1, wherein the reflecting mirror block reflects the modulated light from the optical unit by any one of the reflecting mirrors. The projection unit
A projection lens for enlarging the modulated light;
The projector according to claim 1, wherein the reflecting mirror block is provided between the optical unit that emits the modulated light and the projection lens. An operation unit for selecting a desired reflector from a plurality of the reflectors of the reflector block;
An actuator that, when the reflecting mirror is selected by the operation unit, moves the selected reflecting mirror to a reflection position that reflects the modulated light from the optical unit and can enter the effective magnification region of the projection lens; The projector according to claim 1, further comprising a reflecting mirror driving unit.   The reflecting mirror block is rotatably provided, and the plurality of reflecting mirrors are installed on the reflecting mirror block so as to be arranged at the reflecting position in accordance with the rotation of the reflecting mirror block. The projector according to claim 1, further comprising the actuator that rotationally drives the reflector block. The optical unit has a light modulation element having a screen of the predetermined aspect ratio,
A video signal processing unit that performs video signal processing including processing for changing an aspect ratio of a video represented by the input video signal to an input video signal input from an external video signal supply source;
The video signal processing unit generates a second video signal by performing video signal processing on the input video signal so that the video represented by the input video signal matches the screen of the light modulation element, The projector according to claim 1, wherein the optical unit emits the modulated light according to the second video signal. An identification unit that reads the aspect ratio information of the video defined in the identification signal included in the input video signal;
The reflector is selected so that the aspect ratio of the image projected by the projection light is the same as the aspect ratio of the image defined by the input image signal read by the identification unit, and the selected reflection The projector according to claim 4, further comprising a control unit that issues a command to the reflecting mirror driving unit so that a mirror moves to the reflecting position. The reflecting mirror block is a plane mirror that reflects the modulated light having an aspect ratio of 4: 3 radiated from the optical unit at an aspect ratio as it is;
A convex mirror that converts the 4: 3 aspect ratio of the modulated light into modulated light having an aspect ratio of 16: 9 by expanding the horizontal direction without changing the vertical direction. The projector according to any one of 1 to 7.   The reflecting mirror block further includes a concave mirror that converts the modulated light into modulated light having an aspect ratio of 16: 9 by reducing the vertical direction without changing the horizontal direction of the 4: 3 aspect ratio of the modulated light. The projector according to claim 8. The reflecting mirror block is a plane mirror that reflects the modulated light having an aspect ratio of 16: 9 emitted from the optical unit with an aspect ratio as it is;
A convex mirror that converts the 16: 9 aspect ratio of the modulated light into modulated light having an aspect ratio of 4: 3 by expanding the vertical direction without changing the horizontal direction. The projector according to any one of 1 to 7.   The reflector block further includes a concave mirror that converts the modulated light into a modulated light having an aspect ratio of 4: 3 by reducing the horizontal direction without changing the vertical direction of the 16: 9 aspect ratio of the modulated light. The projector according to claim 10. A light source unit that supplies light, an optical unit that emits modulated light having a predetermined aspect ratio obtained by modulating the light from the light source unit according to a video signal that defines an image, and the modulated light with the same aspect ratio. A reflecting mirror block having a plurality of reflecting mirrors including a reflecting mirror and a reflecting mirror that reflects the modulated light by changing the modulated light to a different aspect ratio; and a projection that expands the modulated light and emits it as projection light to project a projected image And an identification unit that reads the aspect ratio information of the video defined in the identification signal included in the video signal, and a projector control method comprising:
An identification step of reading aspect ratio information of the video defined in the video signal input by the identification unit;
Reflector selection for selecting the reflector of the reflector block so that the aspect ratio of the image projected by the projection light is the same as the aspect ratio of the image defined in the image signal read in the identification step Process,
A projector control method comprising: a reflecting step of reflecting the modulated light onto the projection unit by a reflecting mirror selected in the reflecting mirror selecting step.

Images