JP2016114738A - projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector capable of appropriately correcting color balance.SOLUTION: A projector 1A comprises: a light source device 41; an optical modulator 452; a projection optical device 46; a detector 5A detecting luminance of first color light separated from light emitted from the light source device 41; and a controller controlling at least any of the light source device 41 and the optical modulator 452 according to detection results by the detector 5A and adjusting color balance of an image projected by the projection optical device 46. The detector 5A includes: filters 431 and 432 separating light of a plurality of wavelength ranges being set before hand and different from one another out of the first color light made incident; and sensor devices 51 and 53 detecting individual ones of luminance of the light of the plurality of wavelength ranges separated by the filters 431 and 432.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a projector.

Conventionally, a projector including a light source, a light modulation device that forms an image by modulating light emitted from the light source, and a projection optical device that enlarges and projects the formed image onto a projection surface such as a screen. It has been known. As such a projector, a projector having a light source device having a blue light source having a blue light source having a blue semiconductor laser or an LED (Light Emitting Diode) emitting blue light and a blue light source having the same configuration as the pump light source is known. It has been.
In this projector, the excitation light emitted from the excitation light source is irradiated on the phosphor and wavelength-converted into green light and red light. Then, the green light and the red light and the blue light emitted from the blue light source are combined and made incident on various optical components such as a light modulation device located in the latter stage of the optical path. Since such a light source device has higher durability than a configuration having a discharge lamp as a light source, the frequency of maintenance such as replacement of the light source device can be reduced by adopting the light source device in a projector. Further, since the light source device has high reliability, it can stably emit light having a desired luminance, and can turn on / off the light source and change the luminance relatively freely. Furthermore, since the excitation light source and the blue light source do not contain mercury, an environment-friendly light source device can be configured.

By the way, the luminance of the light emitted from the light source varies with the aging of the light source device and with changes in temperature and applied voltage. In such a case, for example, like the projector above,
When the brightness of light emitted from one of the light sources emitting a certain color light and the light sources emitting another color light changes, the color of the image formed by the light emitted from these light sources and synthesized The balance (white balance) may change, and the image may deteriorate.

In order to solve such a problem, there is known a projector that detects the brightness of each color light of red, green, and blue emitted from a light source and separates the image according to the brightness of each color light (
For example, see Patent Document 1).
The projector described in Patent Document 1 includes a sensor device and a circuit device in addition to the above configuration. Among these, the sensor device has a plurality of optical sensors that detect the brightness of each of the separated red, green, and blue color lights. The circuit device also includes an image processing unit and a panel driving unit. Among these, the image processing unit performs image processing (color correction) that compensates for the decrease in luminance of the color light and maintains the color balance when the luminance of the specific color light decreases. Further, the panel drive unit adjusts the transmission state of the light valve as the light modulation device based on the image signal after the image processing.

JP 2010-210742 A

By the way, as described above, the luminance of light emitted from the light source device changes depending on factors such as aging deterioration of the light source device and changes in temperature and applied voltage, but is included in the light accordingly. The wavelengths of red, green and blue light also change.
However, when the optical sensor included in the projector described in Patent Document 1 detects the luminance of light in a relatively narrow wavelength range that has passed through the filter, if the wavelength of each color light changes due to the above factors, the luminance of the peak wavelength is reduced. There is a possibility that the brightness of the color light cannot be properly detected because the light sensor is out of the detection range.
Further, an optical sensor that detects the luminance of light through a filter whose transmission wavelength range is set in advance cannot detect the wavelength of the light after the change when the wavelength of the light changes. In particular, when a plurality of light sources having a predetermined wavelength of emitted color light, such as the excitation light source and the blue light source, are used, a filter having a transmission wavelength set according to the wavelength is employed. Therefore, the above problem becomes remarkable.
For this reason, there has been a demand for a projector capable of appropriately correcting the color balance even when the light source device is deteriorated.

SUMMARY An advantage of some aspects of the invention is to provide a projector that can appropriately correct the color balance.

A projector according to an aspect of the present invention includes a light source device, a light modulation device that modulates light emitted from the light source device to form an image, and a projection optical device that projects an image formed by the light modulation device And a detection device that detects the luminance of the first color light separated from the light emitted from the light source device, and controls at least one of the light source device and the light modulation device according to a detection result by the detection device. And a control device that adjusts the color balance of the image projected by the projection optical device, and the detection device includes light in a plurality of different wavelength ranges that are set in advance among the incident first color light. And a sensor device for detecting the brightness of each of the light in the plurality of wavelength ranges separated by the filter.

Each of the plurality of wavelength ranges is a wavelength range in which the difference between the lower limit value and the upper limit value of the wavelength is substantially constant (the wavelength width is substantially constant), and the lower limit value and the upper limit value are different. These lower limit value and upper limit value may change according to the usage state of the filter, and a plurality of filter units having different set lower limit values and upper limit values may be used.
According to the one aspect, the filter separates light in a plurality of different wavelength ranges from the incident first color light. For this reason, light of different wavelength ranges among the first color lights is incident on the sensor device. According to this, the sensor device can determine the peak luminance of the first color light by detecting the luminance of the light in the wavelength range of incidence. In addition, the peak wavelength of the first color light can be determined by determining the wavelength range in which the peak luminance is detected. That is, not only the peak luminance of the first color light but also the peak wavelength can be determined even when the wavelength of light emitted from the light source device changes due to the above factors. And a control apparatus can adjust the color balance of the projection image by the said projection optical apparatus by controlling at least any one of a light source device and a light modulation apparatus based on the detection result by the said sensor apparatus. Therefore, it is possible to project an image that has been subjected to color correction corresponding to changes in luminance and wavelength of the first color light.
In addition, it is possible to project an image in which the color balance is adjusted more appropriately by detecting the luminance of the other color light in the same manner as well as the first color light.

In the said one aspect | mode, it is arrange | positioned between the said light source device and the said light modulation apparatus, The light of the said wavelength range of the said 1st color light contained in the light which each enters from the said light source device, and the said wavelength range A dichroic mirror that transmits one of the second color light different from the light and reflects the other, and an adjustment mechanism that adjusts an angle of the dichroic mirror with respect to a central axis of light incident from the light source device. The light modulation device includes a first color light modulation device and a second color light modulation device provided in accordance with the first color light and the second color light, respectively, the filter is the dichroic mirror, and the sensor device is Each time the angle of the dichroic mirror is adjusted by the adjustment mechanism, the front of the first color light according to the angle of the dichroic mirror is adjusted. It is preferable to detect the intensity of light in the wavelength range separated by the dichroic mirror.

As the dichroic mirror, a dielectric multilayer film that transmits one of the light in the wavelength range of the first color light and the second color light and reflects the other is light-transmitting glass or the like by vapor deposition or the like. The structure formed in the conductive substrate can be exemplified.
Here, the dielectric multilayer film has an incident angle dependency in the obtained optical characteristics. That is, the dielectric multilayer film is reflected by the light transmitted through the dielectric multilayer film and reflected by the dielectric multilayer film according to the incident angle of light with respect to the normal line of the light incident surface of the dielectric multilayer film. The wavelength range of the light changes.
In other words, when the incident direction of light is constant, the wavelength range of transmitted or reflected light can be changed by moving the dielectric multilayer film so that the incident angle is changed.
Therefore, by adjusting the angle of the dichroic mirror (the dichroic mirror on which the dielectric multilayer film is formed) with respect to the central axis of the incident light by the adjusting mechanism, the wavelength range of the light separated by the dichroic mirror is adjusted. By changing, light in a plurality of different wavelength ranges can be incident on the sensor device. Thus, the brightness of light in each wavelength range can be detected by the sensor device. Therefore, even when the wavelength of light emitted from the light source device changes due to the above factors, the peak luminance of the first color light can be reliably detected, and the wavelength range separated according to the angle of the dichroic mirror can be determined in advance. By holding it, the peak wavelength of the first color light can be determined.
Further, the dichroic mirror is often used as a configuration that separates a plurality of color lights from the light emitted from the light source device. For this reason, the projector which concerns on the said one aspect | mode can be comprised by adding the said adjustment mechanism and the said sensor apparatus to a projector.

In the one aspect, an adjustment mechanism that adjusts an angle of the filter with respect to a central axis of incident light is provided, and the first color light separated from the light emitted from the light source device is incident on the filter, It is preferable that the sensor device detects the luminance of light in the wavelength range incident through the filter every time the angle of the filter is adjusted by the adjustment mechanism.

An example of the filter is a color filter in which a dielectric multilayer film that transmits light in a predetermined wavelength range of incident light is formed on a light-transmitting substrate such as glass by vapor deposition or the like.
Here, as described above, the dielectric multilayer film has an incident angle dependency.
For this reason, the angle of the light incident on the sensor device through the filter is adjusted by adjusting the angle of the filter (for example, the filter on which the dielectric multilayer film is formed) with respect to the central axis of the incident light by the adjusting mechanism. By changing the range, the brightness of light in a plurality of different wavelength ranges can be detected by the sensor device. Therefore, even when the wavelength of light emitted from the light source device changes due to the above factors, the peak luminance and peak wavelength of the light can be reliably detected.
At this time, since the adjustment mechanism adjusts the angle of the filter, a dichroic mirror used for normal image formation (for example, a dichroic mirror that separates the light in the wavelength range from the first color light and the second color light). ) And the like are not changed. Therefore, an image can be projected stably.

In the said one aspect | mode, it is preferable that the said filter and the said sensor apparatus are integrated.
According to the above aspect, when the angle of the filter is adjusted by the adjustment mechanism, the position of the sensor device is also changed. According to this, the light emitted from the filter can be reliably incident on the sensor device. Therefore, the brightness of the light can be reliably detected.

In the above aspect, the filter includes a plurality of filter units having different wavelength ranges of light to be separated, and the sensor device is provided according to each of the plurality of filter units, and It is preferable to have a plurality of photosensors that detect the luminance.
Note that the plurality of filter units having different wavelength ranges of light to be separated are, for example, in the wavelength range of incident first color light, the wavelength width of the separated light is substantially constant, and the lower limit value and the upper limit value. A plurality of filter sections each having a different shape can be mentioned.
In the said one aspect | mode, the brightness | luminance of several light from which a wavelength each differs among the 1st color lights which inject into a filter can be detected with the some optical sensor provided according to each of the said several filter part. Therefore, the peak luminance and peak wavelength of the light can be determined without adjusting the filter angle. In addition, each filter unit does not have to be an optical filter having a dielectric multilayer film, so that the degree of freedom of filter selection can be improved.

In the above aspect, the detection device includes a light diffusion layer that is positioned between the filter and the sensor device and diffuses and emits incident light, and each of the sensor devices receives incident light. It is preferable to have a plurality of optical sensors for detecting the brightness of the light.

Here, if strong light exceeding the detection limit of the photosensor is incident on the photosensor, the luminance detection by the sensor device cannot be appropriately performed.
On the other hand, according to the above aspect, the light separated by the filter and incident on the light diffusion layer can be dispersed and incident on each of the plurality of photosensors by the light diffusion layer. Therefore, it is possible to suppress the light exceeding the detection limit from being incident on the optical sensor, and to appropriately detect the luminance of the light incident on the filter.

Note that some optical sensors have an incident angle dependency, and depending on the incident angle of light with respect to the optical sensor, luminance may not be detected properly. And when the sensor apparatus which has such an optical sensor is integrated with a filter, if the position of each optical sensor is changed with a filter and the incident angle of the light with respect to each said optical sensor is changed, each sensor May not be able to properly detect the brightness of the incident light.
On the other hand, according to the above aspect, since the light diffused into each photosensor can be made incident by the light diffusion layer, the incident angle dependency of the photosensor can be canceled.
Therefore, it is possible to reliably detect the luminance of incident light by each optical sensor.

In the one aspect, the control device is configured to perform the first based on a detection result by the detection device.
It is preferable to determine a peak wavelength and a peak luminance of the color light, and control at least one of the light source device and the light modulation device based on the peak wavelength and the peak luminance of the first color light.
According to the above aspect, the control device determines the peak wavelength and the peak luminance of the first color light based on the detection result by the detection device. The control device controls at least one of the light source device and the light modulation device based on the determined peak wavelength and peak luminance. According to this, the color adjustment of the projection image (display image) can be executed according to the luminance and the wavelength of the first color light that has changed from the initial use of the projector or the previous adjustment. Therefore, it is possible to reliably project an image with an appropriate color balance. In addition, as described above, by determining the peak wavelength and the peak luminance for other color lights, it is possible to project an image in which the color balance is adjusted more appropriately.

In the above aspect, the light source device preferably includes a plurality of light source units that independently emit different colored lights.
The light source device includes a first light source unit that emits green light and red light by irradiating a phosphor with light emitted from a blue semiconductor laser or blue LED, and a blue semiconductor laser or blue LE.
An example of the light source device includes a second light source unit configured of D or the like and emitting blue light. In addition, examples of the light source device include a light source device that includes a solid light source such as an LED and includes a plurality of light source units that independently emit red, green, and blue color lights. These exemplified light source devices each emit colored light having a relatively narrow wavelength width.
According to the above aspect, even when the luminance and wavelength of colored light emitted from at least one light source unit among the plurality of light source units change due to the above factors, the luminance and wavelength of the light can be detected appropriately and reliably. . Then, when the luminance and wavelength of the colored light emitted from a certain light source section change, the lighting of the light source section that emits other colored light so that the luminance and wavelength of the other colored light matches the luminance and wavelength of the changed colored light Can be controlled. Thereby, since a color balance can be maintained appropriately, a projection image with an appropriate color balance can be projected and displayed.

FIG. 1 is a schematic diagram illustrating a configuration of a projector according to a first embodiment of the invention. The schematic diagram which shows the structure of the 1st light source part in the said 1st Embodiment. The block diagram which shows the structure of the apparatus main body in the said 1st Embodiment. 5 is a flowchart showing image quality adjustment processing in the first embodiment. The schematic diagram which shows the structure of the detection part for blue of the detection apparatus with which the projector which concerns on 2nd Embodiment of this invention is provided. The schematic diagram which shows the structure of the detection part for red of the detection apparatus in the said 2nd Embodiment. The schematic diagram which shows the structure of the detection part for blue of the detection apparatus with which the projector which concerns on 3rd Embodiment of this invention is provided. The schematic diagram which shows the structure of the detection part for red of the detection apparatus in the said 3rd Embodiment. FIG. 10 is a schematic diagram illustrating a configuration of a projector according to a fourth embodiment of the invention. The schematic diagram which shows the structure of the detection apparatus in the said 4th Embodiment. The block diagram which shows the structure of the projector in the said 4th Embodiment. The schematic diagram which shows the structure of the detection part for blue of the detection apparatus with which the projector which concerns on 5th Embodiment of this invention is provided.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described based on the drawings.
[Schematic configuration of projector]
FIG. 1 is a schematic diagram illustrating a configuration of a projector 1A according to the present embodiment.
The projector 1A according to the present embodiment modulates light emitted from the light source device 41 disposed therein to form an image according to image information, and the image is projected onto a projected surface (such as a screen) (
This is an image display device that enlarges and projects the image on the screen. As will be described in detail later, the projector 1A, when it is determined that the luminance and wavelength of light emitted from the light source device 41 have changed due to factors such as aging and temperature, the peak luminance and peak wavelength of the light are changed. Based on this, the color balance of the projected image is adjusted.
As shown in FIG. 1, such a projector 1 </ b> A includes an exterior housing 2 constituting an exterior,
An apparatus main body 3 housed in the exterior housing 2.

[Device configuration]
The apparatus main body 3 performs the operations of the optical unit 4 that forms and projects the image, the detection device 5A that detects the luminance of light used for image formation by the optical unit 4, the adjustment mechanism 6, and the entire projector 1. And a control device 7 for controlling (not shown in FIG. 1). In addition,
Although not shown, the apparatus main body 3 sends an operation signal corresponding to the input operation of the user to the control device 7.
A cooling device that cools the components of the projector 1A, a power supply device that supplies power to the electronic components of the projector 1A, and the like.

[Configuration of optical unit]
The optical unit 4 forms and projects an image according to the image signal input from the control device 7. The optical unit 4 includes a light source device 41, a uniform illumination device 42, a color separation device 43, a relay device 44, an image forming device 45, a projection optical device 46, and an optical component housing 47.

[Configuration of light source device]
The light source device 41 emits a light beam to the uniform illumination device 42. The light source device 41 emits blue light toward the first light source unit 411 that emits red light and green light toward the dichroic mirror 422 constituting the uniform illumination device 42 and the reflection mirror 421 that constitutes the uniform illumination device 42. And a second light source unit 419 that emits light.
Among these, the configuration of the first light source unit 411 will be described in detail later.
The second light source unit 419 also includes a plurality of solid state light sources (LD (Laser Diod)) that emit blue light having a relatively narrow wavelength band (for example, blue light having a difference between the lowest wavelength and the highest wavelength of about 15 nm).
An example of a configuration in which e) and LEDs are arranged.

[Configuration of uniform illumination device]
The uniform illumination device 42 synthesizes light incident from the first light source unit 411 and the second light source unit 419 and illuminates each light modulation device 452 described later with the synthesized light substantially uniformly. The uniform illumination device 42 includes a reflection mirror 421, a dichroic mirror 422, a pair of lens arrays 423 and 424, a polarization conversion element 425, and a superimposing lens 426.
The reflection mirror 421 reflects the blue light incident from the second light source unit 419 toward the dichroic mirror 422.
The dichroic mirror 422 transmits the red light and the green light incident from the first light source unit 411 and guides them to the lens array 423, and the second light source unit 41 via the reflection mirror 421.
The blue light incident from 9 is reflected toward the lens array 423. That is, the dichroic mirror 422 combines the incident red, green, and blue color lights and outputs the combined light to the lens array 423.

Although not shown, the lens array 423 includes small lenses that divide the light incident from the dichroic mirror 422 into a plurality of partial light beams.
The lens array 424 includes small lenses corresponding to the small lenses of the lens array 423, and the partial light beams incident from the lens array 423 together with the superimposing lens 426 are converted into the light modulation device 4.
52 is superimposed.
The polarization conversion element 425 is disposed between the lens array 424 and the superimposing lens 426, and converts the light incident from the lens array 424 into one type of linearly polarized light.

[Configuration of color separation device]
The color separation device 43 separates each color light of red (R), green (G), and blue (B) from the light flux incident from the uniform illumination device 42. The color separation device 43 includes a dichroic mirror 431,
432 and a reflection mirror 433.
The dichroic mirrors 431 and 432 correspond to the filter of the present invention in this embodiment. Each of these dichroic mirrors 431 and 432 has a configuration in which a dielectric multilayer film is formed on a light-transmitting substrate such as glass, and each transmits predetermined color light and reflects other color light.

Specifically, the dichroic mirror 431 is a filter that separates blue light, green light, and red light from incident light, and more specifically, a band that transmits blue light and reflects green light and red light. It is a pass filter. The dichroic mirror 431 has a constant transmission wavelength range (a constant transmission wavelength width determined by a preset lower limit value and upper limit value) in a wavelength range classified as blue. This transmission wavelength range is a relatively narrow wavelength range, and in this embodiment, the transmission wavelength range is set to a predetermined range including the wavelength band of blue light emitted from the second light source unit 419. The dichroic mirror 431 has a constant reflection wavelength range (a constant reflection wavelength width determined by a preset lower limit value and upper limit value) in a wavelength range classified into green and red.

Such a dichroic mirror 431 rotates along a direction orthogonal to the central axis of the light beam incident from the uniform illumination device 42 and orthogonal to the traveling direction of the blue light reflected by the dichroic mirror 431. It can be rotated around the axis RA1.
In other words, the dichroic mirror 431 is configured to be rotatable about a rotation axis RA1 along a direction orthogonal to the normal line of the light incident surface of the mirror 431.

The dichroic mirror 432 is a filter that separates green light and red light from incident light. More specifically, the dichroic mirror 432 is a band-pass filter that reflects green light and transmits red light. More specifically, the dichroic mirror 432 has a certain transmission wavelength range in the wavelength range classified as red. Similar to the above, this transmission wavelength range is a relatively narrow wavelength range. In this embodiment, the transmission wavelength range is set to a predetermined range including the wavelength band of red light emitted from the first light source unit 411. The dichroic mirror 432 has a certain reflection wavelength range in the wavelength range classified as green. The reflection wavelength range is not set narrow, but may be set to a predetermined range including the wavelength band of green light emitted from the first light source unit 411.

Such a dichroic mirror 432 is a rotation axis along a direction orthogonal to the central axis of the light beam incident on the dichroic mirror 432 and orthogonal to the traveling direction of the green light reflected by the dichroic mirror 432. It can be rotated around RA2. In other words, the dichroic mirror 432 is configured to be rotatable about a rotation axis RA2 along a direction orthogonal to the normal line of the light incident surface of the mirror 432.
These dichroic mirrors 431 and 432 are provided with an adjusting mechanism 6 (61, 61) to be described later.
62), they are respectively rotated in the A1 direction and the A2 direction in FIG. 1 about the corresponding rotation axes RA1 and RA2.
Thus, when the dichroic mirrors 431 and 432 are rotated, the angle of each dielectric multilayer film with respect to the central axis of the incident light beam is changed. As a result, the color separation characteristics change depending on the incident angle dependency of the dielectric multilayer film, and the dichroic mirrors 431 and 43
The wavelength ranges of blue light, green light, and red light separated by 2 are changed.

The reflection mirror 433 reflects the blue light incident through the dichroic mirror 431 and guides it to the light modulator 452 (452B) for blue light. The reflection mirror 433 does not reflect all of the incident blue light, but transmits part of the light. This part of the light is a sensor group 5 of the detection device 5A located on the side opposite to the light incident side with respect to the reflection mirror 433.
1 is incident.

The relay device 44 guides the red light transmitted through the dichroic mirror 432 to the light modulator 452 (452R) for red light, and includes an incident side lens 441 and a relay lens 443.
And reflection mirrors 442 and 444. The relay device 44 is intended to prevent a reduction in the utilization efficiency of red light due to diffusion or the like, but may be configured to pass other color light (for example, blue light) instead of red light.
Among these, the reflection mirror 444 is similar to the reflection mirror 433, and the relay lens 4.
Instead of reflecting all of the red light incident through 43, a part of the light is transmitted.
This part of the light is a detection device 5A located on the opposite side of the light incident side with respect to the reflection mirror 444.
Is incident on the sensor group 53.

The image forming apparatus 45 modulates red, green, and blue color light incident via the color separation device 43 and the relay device 44, and then combines them to form image light. Such an image forming apparatus 45 includes three field lenses 451 provided for each color light, and three light modulation devices 452 (for red, green, and blue light modulation devices 452 provided for each color light).
R, 452G, 452B) and a color composition device 453.
Each field lens 451 collimates incident light and guides the light to the corresponding light modulation device 452.

Each light modulation device 452 modulates the incident color light to form an image corresponding to the image signal input from the control device 7. Although not shown in detail, these light modulators 452 are configured as a liquid crystal light valve including a liquid crystal panel that is driven in accordance with the image signal and a pair of polarizing plates that sandwich the liquid crystal panel.
The color composition device 453 is configured by a cross dichroic prism. This cross dichroic prism is a prism having a substantially square shape in plan view formed by bonding four right-angle prisms, and is combined with three light incident surfaces on which the colored lights modulated by the respective light modulation devices 452 are incident. A light emitting surface from which light is emitted. This cross dichroic prism synthesizes each color light modulated by the corresponding light modulation device 452 by two dielectric multilayer films formed at the interface of the four right angle prisms.

[Configuration of Projection Optical Device]
The projection optical device 46 enlarges and projects each color light synthesized by the color synthesis device 453, that is, image light onto the projection surface. Although not shown in detail, the projection optical device 46 is configured as a combined lens having a lens barrel and a plurality of lenses arranged in the lens barrel.

[Configuration of optical component casing]
Although not shown in detail, the optical component casing 47 includes a component storage member that stores therein the optical components constituting the devices 42 to 44, and a component storage opening formed in the component storage member. A lid-like member for closing. An illumination optical axis AX is set in the optical component casing 47, and the devices 42 to 44 are disposed at predetermined positions with respect to the illumination optical axis AX.
The light source device 41, the image forming device 45, and the projection optical device 46 are arranged according to the illumination optical axis AX.

[Configuration of the first light source unit]
FIG. 2 is a schematic diagram illustrating the configuration of the first light source unit 411.
As described above, the first light source unit 411 emits green light and red light to the dichroic mirror 422.
To exit. As shown in FIG. 2, the first light source unit 411 includes a solid light source array 412, a reflection mirror group 413, a condenser lens group 414, a dichroic prism 415, a pickup lens 416, and a wavelength conversion device 417.

The solid light source array 412 is provided according to the plurality of solid light sources 4121, the substrate 4122 on which the plurality of solid light sources 4121 are mounted, and the solid light sources 4121.
1 and a collimating lens 4123 that collimates the light incident from 1. In this embodiment, the solid light source 4121 is configured by an LD that emits color light of a predetermined wavelength (for example, color light in the ultraviolet region), and the solid light sources 4121 are arranged in a matrix on the substrate 4122.
The reflection mirror group 413 is provided according to each solid light source 4121.
There are a plurality of 131. These reflection mirrors 4131 reflect the parallel light incident from the solid light source 4121 via the parallelizing lens 4123 toward the condenser lens group 414 substantially parallel to each other.

The condenser lens group 414 includes a condenser lens 4141, a collimating lens 4142, and a homogenizer 4143.
The condensing lens 4141 condenses the light incident from the respective reflecting mirrors 4131 to form a light beam and emits the light toward the parallelizing lens 4142.
The collimating lens 4142 converts the incident light beam into parallel light along the central axis of the light beam and emits it to the homogenizer 4143.

The homogenizer 4143 equalizes the in-plane illuminance of the incident light beam (illuminance in the plane perpendicular to the central axis of the light beam), and although not shown in detail, a pair of lens arrays and these Holding member.
Among these, the pair of lens arrays has the same configuration as the lens arrays 423 and 424 described above, splits the light beam incident from the parallelizing lens 4142 into a plurality of partial light beams, The light is superimposed on the fluorescent layer 4172 formed on the wheel 4171 of the wavelength conversion device 417 via the dichroic prism 415 and the pickup lens 416. Accordingly, light with uniform in-plane illuminance is incident on the fluorescent layer 4172.

The dichroic prism 415 includes a separation layer 4151 that reflects light having a wavelength shorter than a predetermined wavelength and transmits light having the predetermined wavelength or longer. In this embodiment, the separation layer 4151 reflects the ultraviolet light incident from the homogenizer 4143 toward the pickup lens 416, and
The optical path of the light is bent approximately 90 degrees. Further, the separation layer 4151 transmits light incident through the pickup lens 416 (light converted in wavelength by the wavelength conversion device 417).
The light transmitted through the dichroic prism 415 enters the dichroic mirror 422.

The pickup lens 416 collects and superimposes each partial light beam incident through the dichroic prism 415 on a predetermined portion of the fluorescent layer 4172 in the wheel 4171 of the wavelength conversion device 417. In addition, the pickup lens 416 condenses the light wavelength-converted by the wavelength conversion device 417 and makes it incident on the dichroic mirror 422 through the dichroic prism 415.

The wavelength conversion device 417 converts the wavelength of the incident light and emits the converted light. The wavelength conversion device 417 includes a wheel 4171 and a rotation unit 4174.
Among these, the rotation means 4174 is constituted by a wheel motor that rotates with the central axis of the wheel 4171 as the rotation axis. By this rotating means 4174, the wheel 4
By rotating 171, the wheel 4171 is cooled.

The wheel 4171 has a reflective layer 4 formed on the surface facing the pickup lens 416.
173 and a fluorescent layer 4172 stacked on the reflective layer 4173. The phosphor included in the fluorescent layer 4172 emits light having a predetermined wavelength in all directions by being excited by absorbing light incident from the pickup lens 416. In the present embodiment, the phosphor absorbs light in the ultraviolet region, and each has green light and red light in a relatively narrow wavelength band (for example, green having a difference between the minimum wavelength and the maximum wavelength of about 15 nm, respectively). Light and red light).
The light wavelength-converted by such a phosphor is reflected by the reflection layer 4173, passes through the pickup lens 416 and the dichroic prism 415, and enters the dichroic mirror 422 as described above.

[Configuration of detection device]
Returning to FIG. 1, the detection device 5 </ b> A detects the intensity of the color light separated by the color separation device 43. Specifically, the detection device 5A includes a blue detection unit 5AB that detects the luminance of blue light, and a red detection unit 5AR that detects the luminance of red light.
These detection units 5AB and 5AR have the same configuration. Specifically, the blue detection unit 5
AB is constituted by the dichroic mirror 431 functioning as a filter in addition to the sensor group 51 and the light diffusion layer 52. The red detection unit 5AR includes the sensor group 53 and the light diffusion layer 54, and the dichroic mirror 432 that functions as a filter. That is, the blue detection unit 5AB and the red detection unit 5AR each constitute a detection device of the present invention, and the sensor groups 51 and 53 correspond to sensor devices. Further, in the blue detection unit 5AB, the first color light is blue light, and in the red detection unit 5AR, the first color light is red light.

The sensor group 51 constituting the blue detection unit 5AB is disposed on the back side of the reflection mirror 433 (the side opposite to the light incident side). More specifically, the sensor group 51 includes the optical component casing 4 in the space SP1 formed between the back surface of the reflection mirror 433 and the optical component casing 47.
7 is attached to the wall surface. Although not shown, the sensor group 51 has a configuration in which a plurality of optical sensors capable of detecting the luminance of incident light (that is, light in a predetermined wavelength range among blue light) are arranged in a matrix. The detection device 5A outputs the luminance detected by each optical sensor to the control device 7.
The light diffusion layer 52 is disposed between the reflection mirror 433 and the sensor group 51, and diffuses the light when incident light is transmitted. As a result, the light transmitted through the reflection mirror 433 and incident on the light diffusion layer 54 is diffused and emitted, so that the light can be uniformly incident on each of the optical sensors included in the sensor group 51. In addition, the incident angle dependency of the optical sensor can be canceled.

The sensor group 53 constituting the red detection unit 5AR is disposed on the back side (the side opposite to the light incident side) of the reflection mirror 444. More specifically, the sensor group 53 includes the optical component casing 4 in the space SP2 formed between the back surface of the reflection mirror 444 and the optical component casing 47.
7 is attached to the wall surface. Similar to the sensor group 51, the sensor group 53 includes a plurality of optical sensors capable of detecting the luminance of incident light (that is, light in a predetermined wavelength range among red light) arranged in a matrix. The detection device 5 </ b> A outputs the luminance detected by each optical sensor to the control device 7.
The light diffusion layer 54 is disposed between the reflection mirror 444 and the sensor group 53, and diffuses the light when incident light is transmitted. As a result, the light transmitted through the reflection mirror 444 and incident on the light diffusion layer 54 is diffused and emitted, so that the light can be uniformly incident on each of the optical sensors included in the sensor group 53. In addition, the incident angle dependency of the optical sensor can be canceled.
In the present embodiment, the light diffusion layers 52 and 54 are attached to the back surfaces of the reflection mirrors 433 and 444. However, the present invention is not limited to this, and the back surfaces of the reflection mirrors 433 and 444, the sensor groups 51 and 53, and the like. What is necessary is just to be arrange | positioned.

[Configuration of adjustment mechanism]
FIG. 3 is a block diagram showing a configuration of the apparatus main body 3.
As described above, the apparatus main body 3 includes the adjustment mechanism 6 and the control device 7 in addition to the optical unit 4 and the detection device 5A.
The adjustment mechanism 6 adjusts the wavelength of light incident on the sensor groups 51 and 53. The adjustment mechanism 6 adjusts the wavelength of blue light incident on the sensor group 51 as shown in FIG. The blue adjustment unit 6B to be adjusted and the red adjustment unit 6R to adjust the wavelength of red light incident on the sensor group 53 are included.

The blue adjustment unit 6B adjusts the wavelength of blue light incident on the sensor group 51 via the dichroic mirror 431 and the reflection mirror 433 by rotating the dichroic mirror 431 about the rotation axis RA1. .
Here, as described above, the dielectric multilayer film formed on the dichroic mirror 431 has an incident angle of light with respect to the dielectric multilayer film (angle of the central axis of incident light with respect to the normal of the surface of the dielectric multilayer film). Accordingly, the wavelength range of the separated light changes. That is, when the incident angle is changed, the wavelength range of the light that passes through the dichroic mirror 431 and enters the sensor group 51 among the blue light incident on the dichroic mirror 431 changes.
For this reason, the blue adjustment unit 6B rotates the dichroic mirror 431 to change the incident angle of light incident on the dielectric multilayer film of the dichroic mirror 431.
The wavelength range of the blue light incident on the sensor group 51 is changed.

Similar to the blue adjustment unit 6B, the red adjustment unit 6R rotates the dichroic mirror 432 about the rotation axis RA2, and transmits light to the dielectric multilayer film formed on the dichroic mirror 432. Change the incident angle. As a result, the red adjustment unit 6 </ b> R changes the wavelength range of the light that passes through the dichroic mirror 432 and enters the sensor group 53 among the red light incident on the dichroic mirror 432.
Each of the blue adjustment unit 6B and the red adjustment unit 6R includes a drive device such as a stepping motor that is driven under the control of the control device 7, and the drive amount of the drive device is determined by the control device 7. Managed by. The rotation angle of the dichroic mirrors 431 and 432 can be grasped from the driving amount of the driving device.
As will be described in detail later, the control device 7 determines the rotation angle (or the light incident angle) of the dichroic mirrors 431 and 432 based on the driving amount of the driving device and the light separated by the dichroic mirrors 431 and 432. Wavelength range (dichroic mirrors 431 and 43
2 is determined based on a table (color separation information) associated with the wavelength range of the light transmitted through 2).

[Configuration of control device]
The control device 7 includes a CPU (Central Processing Unit), a flash memory, and a RAM.
(Random Access Memory) and the like are mounted, and the operation of the entire projector 1A is controlled according to an operation signal input from the operation device or autonomously. The control device 7 controls the lighting of the light source device 41, processes image information received from a connected external device, operates the light modulation device 452 in accordance with the image information, and operates the image An image corresponding to information is formed and projected.
The control device 7 emits light from the light source device 41 based on the detection results of the detection units 5AB and 5AR input from the detection device 5A and the drive states of the adjustment units 6B and 6R of the adjustment mechanism 6. The luminance and wavelength of the emitted light are acquired, and the peak luminance and peak wavelength of blue light and red light are determined. Then, when the peak brightness and the peak wavelength are different from the peak brightness and the peak wavelength at the time of shipment of the projector 1A, the control device 7 determines the color of the projection image based on the determined peak brightness and the peak wavelength. An image quality adjustment process for adjusting the balance is executed.
In order to execute this image quality adjustment process, the control device 7 includes a storage unit 71, as shown in FIG.
Image processing unit 72, operation control unit 73, information acquisition unit 74, acquisition determination unit 75, peak determination unit 76
And an image quality adjustment unit 77.

The storage unit 71 includes the flash memory and the frame memory, and stores various programs and data necessary for controlling the operation of the projector 1A by the control device 7. As such data, the storage unit 71 includes, for example, the rotation angle (rotation angle from the reference position) of the dichroic mirrors 431 and 432 based on the driving amount of the adjustment mechanism 6 and the blue light and the red light. A table (color separation information) in which the wavelength range (transmission wavelength range) of light separated by the dichroic mirrors 431 and 432 rotated at the rotation angle is associated is stored. Instead of the rotation angle of the dichroic mirrors 431 and 432, an incident angle of light with respect to the dielectric multilayer film after the rotation of the dichroic mirrors 431 and 432 may be set.
Further, the storage unit 71 stores the luminances of the blue light and the red light respectively acquired from the detection device 5A by the information acquisition unit 74, which will be described later, according to the rotation angles of the dichroic mirrors 431 and 432.
Further, the storage unit 71 stores the peak luminance and peak wavelength of blue light and red light at the time of shipment of the projector 1A.

The image processing unit 72 develops and draws image information received from the external device in the frame memory of the storage unit 71. At this time, the image processing unit 72 performs predetermined correction processing (gamma correction or the like) on the image developed on the frame memory.

The operation control unit 73 controls the operation of the projector 1A based on the program and data stored in the storage unit 71. Specifically, the operation control unit 73 controls the operations of the optical unit 4, the detection device 5 </ b> A, and the adjustment mechanism 6.
For example, the operation control unit 73 controls the lighting of the light source device 41 and outputs an image signal based on the image developed on the frame memory to each light modulation device 452. Further, the operation control unit 73 outputs an operation signal to each of the adjustment units 6B and 6R of the adjustment mechanism 6, and the adjustment unit 6B.
, 6R to control the rotation of the dichroic mirrors 431, 432. In addition, the operation control unit 73 causes the detection units 5AB and 5AR to detect the luminance of light incident when the dichroic mirrors 431 and 432 are rotated.
The information acquisition unit 74 acquires information received from the external device or the like, an operation signal input from the operation device, and a detection result from the detection device 5A.

The acquisition determination unit 75 determines whether or not luminance detection in a necessary wavelength range has been performed. In other words, the acquisition determination unit 75 separates the light in the required wavelength range in the blue light and red light wavelength bands and enters the detection units 5AB and 5AR so as to be incident on the detection units 5AB and 5AR.
It is determined whether or not 32 has been rotated.
If it is determined by the acquisition determination unit 75 that luminance detection in the necessary wavelength range is not performed, the dichroic mirrors 431 and 432 are rotated by the adjustment units 6B and 6R under the control of the operation control unit 73. It is rotated about the axes RA1 and RA2, and the incident angle of light with respect to the dielectric multilayer film of the dichroic mirrors 431 and 432 is changed. Then, under the control of the operation control unit 73, the detection of luminance of each incident light is performed by the detection units 5AB and 5AR, and a detection signal indicating the detection result is acquired by the information acquisition unit 74. Thereafter, the determination process by the acquisition determination unit 75 is performed again.

The peak determination unit 76, based on the detection result of the detection device 5A acquired by the information acquisition unit 74, each peak luminance (maximum luminance) and peak wavelength (wavelength of light indicating peak luminance) of blue light and red light. To decide. Specifically, the peak determination unit 76 acquires from the storage unit 71 the wavelength ranges of the blue light and the red light that pass through the dichroic mirrors 431 and 432 according to the rotation angles of the dichroic mirrors 431 and 432, respectively. By comparing the luminance of light in the wavelength range, the respective peak luminance and peak wavelength of blue light and red light are determined.

Based on the determined peak wavelength and peak luminance, the image quality adjustment unit 77 performs the optical unit 4
The image quality of the image formed by is adjusted. Specifically, the image quality adjustment unit 77 adjusts the color balance (white balance) of the formed image based on the peak wavelength and peak luminance.
For example, the deterioration of the first light source unit 411 that emits red light and green light proceeds from the second light source unit 419 that emits blue light, and the luminance of red light out of the detected luminances of blue light and red light, respectively. Is lower than the luminance of the blue light, the luminance of the blue light emitted from the second light source unit 419 is decreased by reducing the voltage applied to the second light source unit 419 or the like. Thereby, the balance between the luminance of blue light and the luminance of red light and green light can be maintained.
In addition, the image quality adjustment unit 77 performs color correction of an image formed by the light modulation device 452 according to the determined peak wavelength, that is, color correction of an image drawn on the frame memory. To be carried out.
In addition, when the applied voltage with respect to a solid light source changes, the wavelength of the light radiate | emitted from the said solid light source changes. For this reason, when the voltage applied to at least one of the first light source unit 411 and the second light source unit 419 is changed, the image quality adjustment unit 77 performs the color correction accordingly.

[Image quality adjustment processing]
FIG. 4 is a flowchart showing image quality adjustment processing.
Next, image quality adjustment processing executed by the control device 7 will be described. This image quality adjustment process is executed by a processing circuit such as a CPU constituting the control device 7 processing the image quality adjustment program stored in the storage unit 71 at a predetermined timing. Examples of the timing include a case where an input operation for executing image quality adjustment processing is performed, and a case where the cumulative driving time of the projector 1A has reached a predetermined time.
In this image quality adjustment process, as shown in FIG. 4, first, the operation control unit 73 performs the blue adjustment unit 6B.
The dichroic mirror 431 is rotated by (Step S1), and the blue light separated by the dichroic mirror 431 after the rotation has a substantially constant wavelength width, and the luminance of the light in different wavelength ranges. Then, the detection unit 5AB for blue is detected (step S2).

Thereafter, the acquisition determination unit 75 determines whether or not the luminance detection in the necessary wavelength range in the blue light wavelength range has been completed (step S3).
Here, if it is determined that the luminance detection in the necessary wavelength range is not completed, the control device 7
The process returns to step S1, and the operation control unit 73 further rotates the dichroic mirror 431 by a predetermined angle to change the wavelength range, and causes the luminance of the light incident on the blue detection unit 5AB (in blue light). The brightness of the light in the changed wavelength range is detected.

On the other hand, when it is determined that the luminance detection in the necessary wavelength range is completed, the operation control unit 73
The position of the dichroic mirror 431 is returned to the original position, and the dichroic mirror 432 is rotated by the red adjustment unit 6R (step S4), and the dichroic mirror 432 after rotation is rotated.
Among the red lights separated by the above, the red detector 5AR detects the luminance of light having a substantially constant wavelength width and having different wavelength ranges (step S5).

Thereafter, the acquisition determination unit 75 determines whether or not the luminance detection in the necessary wavelength range in the wavelength range of red light has been completed (step S6).
Here, if it is determined that the luminance detection in the necessary wavelength range is not completed, the control device 7
The process returns to step S4, and the operation control unit 73 further rotates the dichroic mirror 432 by a predetermined angle to change the wavelength range, and the luminance of the light incident on the red detection unit 5AR (in red light) The brightness of the light in the changed wavelength range is detected.
On the other hand, when it is determined that the luminance detection in the necessary wavelength range is completed, the peak determination unit 76 detects the luminance of the light detected according to the respective rotation angles of the dichroic mirrors 431 and 432, and the above Based on the table memorize | stored in the memory | storage part 71, each peak brightness | luminance and peak wavelength of blue light and red light are determined (step S7).

Then, based on the determined peak luminance and peak wavelength of the blue light and red light, the image quality adjustment unit 77 includes the lighting of the light source device 41 and the color correction of the drawn image as described above. The color balance is adjusted (step S8).
When the process of step S8 is completed, the image quality adjustment process is terminated. By such image quality adjustment processing, an image with an appropriate color balance can be projected.
In the image quality adjustment process, the blue light luminance detection process performed in steps S1 to S3 is followed by the red light luminance detection process performed in steps S4 to S6. However,
However, the present invention is not limited to this, and the luminance detection processing for red light may be performed first, and the luminance detection processing for blue light may be performed later, or these luminance detection processing may be performed simultaneously.
Further, the steps S1 to S7 are executed when the projector 1A is powered off, and the determined peak wavelength and peak luminance of the blue light and the red light are stored in the storage unit 71 when the projector 1A is activated next time. The peak wavelength and peak luminance of blue light and red light at the time of shipment are compared, and when at least one of the peak wavelength and peak luminance is different, step S8 may be executed.

[Effect of the first embodiment]
The projector 1A according to the present embodiment described above has the following effects.
Of the blue light incident on the dichroic mirror 431, the wavelength of the light separated by the mirror 431 and incident on the blue detector 5AB of the detection device 5A is determined by the rotation angle of the mirror 431 by the adjustment mechanism 6. Will change accordingly. Similarly, of the red light incident on the dichroic mirror 432, the red light is separated by the mirror 432 and is detected by the detection unit 5 for red of the detection device 5A.
The wavelength of light incident on the AR changes according to the rotation angle of the mirror 432 by the adjusting mechanism 6. Each of the blue detection units 5AB and the red detection unit 5AR detects the luminance of light incident when the dichroic mirrors 431 and 432 are rotated. According to this, based on the detection result of detection part 5AB and 5AR, each peak brightness | luminance and peak wavelength of blue light and red light can be determined. Then, the image quality adjustment unit 77 of the control device 7 controls the operations of the light source device 41 and the light modulation device 452 as described above, whereby the projection optical device 4.
6 can adjust the color balance of the image projected.
In the present embodiment, since the first light source unit 411 is configured to emit red light and green light, the peak wavelength and peak of green light can be determined by grasping changes in the peak wavelength and peak luminance of red light. The change in brightness can be grasped. Therefore, since the peak wavelength and peak luminance of each color light of red, green and blue can be grasped, the color balance of the projected image can be adjusted more appropriately.

In the projector 1A, the adjustment mechanism 6 rotates the dichroic mirrors 431 and 432 having the dielectric multilayer film, and adjusts the angle with respect to each incident light, whereby blue light and red light incident on the mirrors 431 and 432 are adjusted. Of the light, the mirror 431
, 432, the wavelength range (wavelength band) of light emitted (transmitted) is changed. Thereby, the wavelength range of the light incident on the blue detection unit 5AB and the red detection unit 5AR can be changed. Since such dichroic mirrors 431 and 432 are widely used as a configuration for separating a plurality of color lights from the light emitted from the light source device 41, the adjustment mechanism 6 and the sensor group 51,
By adding 53, it is possible to determine the peak luminance and the peak wavelength of each of the blue light and the red light, and hence the peak luminance and the peak wavelength of each of the three color lights including the green light.

Each of the sensor groups 51 and 53 has a configuration in which a plurality of optical sensors are arranged in a matrix, and light diffusion layers 52 and 54 are disposed between the sensor groups 51 and 53 and the dichroic mirrors 431 and 432. Has been. According to this, by the light diffusion layers 52 and 54,
Of blue light and red light, light separated by the dichroic mirrors 431 and 432 (light transmitted through the mirrors 431 and 432) can be dispersed and incident on the respective optical sensors of the sensor groups 51 and 53. Therefore, it is possible to prevent light exceeding the detection limit from entering one optical sensor, and it is possible to appropriately detect the luminance of blue light and red light.

The peak determination unit 76 of the control device 7 is based on the detection result of the detection device 5 </ b> A, the rotation angle of the mirrors 431 and 432 when the luminance of incident light is detected, and the table stored in the storage unit 71. Thus, the peak wavelength and peak luminance of blue light and red light are determined. And
Based on the determined peak wavelength and peak luminance, the image quality adjustment unit 77 controls the light source device 41 and the light modulation device 452 as described above to adjust the color balance of the projected image (display image). According to this, the color adjustment of the projection image according to the brightness | luminance and the wavelength which changed from the time of the initial use of the projector 1A or the last adjustment can be performed. Therefore, it is possible to reliably project and display an image having an appropriate color balance.

The light source device 41 includes a first light source unit 411 that emits red light and green light, and a second light source unit 419 that emits blue light. Among these, even when the luminance and wavelength of the colored light emitted from at least one light source unit change due to the above factors, the luminance of the light can be detected appropriately and reliably. For example, when the luminance of the blue light emitted from the second light source unit 419 decreases, the lighting of the first light source unit 411 can be controlled to match the changed luminance. Thereby, since a color balance can be maintained appropriately, a projection image with an appropriate color balance can be projected and displayed.

[Modification of First Embodiment]
In the first embodiment, since the first light source unit 411 emits red light and green light having the same luminance, the luminance and wavelength of green light are determined based on the determined changes in luminance and wavelength of red light. Can understand changes in For this reason, from the viewpoint of reducing the number of components, the green detection unit that detects the luminance of the green light is not provided in the projector 1A.
However, for example, when the light source device 41 includes a red light source, a green light source, and a blue light source that respectively emit red, green, and blue color lights, the detection device 5A includes a green detection unit. Also good. In this case, the green detection unit is, for example, the dichroic mirror 432.
It is proposed to provide near the green field lens 451 provided on the optical path of the green light separated by the above. According to this, it is possible to detect the luminance of the green light leaking from the field lens 451 while preventing the green detection unit from blocking the optical path of the green light. Also, by comparing the brightness and wavelength of each color light before the brightness and wavelength change (the brightness and wavelength of each color light at the time of shipment of the projector 1A), it is possible to grasp changes in the brightness and wavelength of each color light. By performing the lighting control of each light source and the color correction of the drawn image according to the luminance and wavelength of each color light, the color balance of the projected image can be adjusted in more detail.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
The projector according to the present embodiment has the same configuration and function as the projector 1A. Here, in the projector 1A, of the blue light and red light incident on the dichroic mirrors 431 and 432, the light separated by the mirrors 431 and 432 and incident on the sensor groups 51 and 53 of the detection device 5A. The wavelength range of the mirrors 431 and 432
It was changed by rotating. In contrast, in the projector according to this embodiment,
By rotating a filter disposed on the light incident side of each sensor group, the wavelength range of the light is changed. In this respect, the projector according to the present embodiment is different from the projector 1A. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 5 shows a blue detection unit 5B of the detection device 5B provided in the projector 1B according to the present embodiment.
FIG. 6 is a schematic diagram illustrating a configuration of a red detection unit 5BR included in the detection device 5B.
As shown in FIGS. 5 and 6, the projector 1 </ b> B according to the present embodiment includes a detection device 5 </ b> B instead of the detection device 5 </ b> A, and the adjustment mechanism 6 includes a filter 55 (FIG. 5) configuring the detection device 5 </ b> B. ), 56 (FIG. 6), except that the projector has the same configuration and function as the projector 1A.
The detection device 5B includes a blue detection unit 5BB (FIG. 5) that detects the luminance of the blue light separated by the dichroic mirror 431, and a red detection that detects the luminance of the red light separated by the dichroic mirror 432. Part 5BR (FIG. 6).

In the dichroic mirror 431 provided in the projector 1B according to the present embodiment, the transmission wavelength range of blue light and the reflection wavelength ranges of green light and red light are set wide, and light having a wavelength classified as blue. Are all transmissive, and all light with wavelengths classified as green and red can be reflected. Similarly, in the dichroic mirror 432, the transmission wavelength range of red light and the reflection wavelength range of green light are set wide, respectively, and all light having wavelengths classified as red can be transmitted and classified as green. All the light of the wavelength to be reflected can be reflected.

The blue detection unit 5BB of the detection device 5B is arranged in the space SP1 similarly to the blue detection unit 5AB. As shown in FIG. 5, the blue detection unit 5BB further includes a filter 55 in addition to the sensor group 51 and the light diffusion layer 52 similar to the blue detection unit 5AB. That is, the blue detection unit 5BB in the present embodiment does not include the dichroic mirror 431.
This filter 55 has a certain wavelength range (wavelength width) in the wavelength range classified as blue light.
The band-pass filter transmits light having a wavelength of 1 and has a configuration in which a dielectric multilayer film is formed on a light-transmitting substrate such as glass. For this reason, when the incident angle of light to the dielectric multilayer film formed on the filter 55 changes, the wavelength range of the transmitted light shifts. The transmission wavelength range of the filter 55 is set to a relatively narrow range (for example, a range of about 15 nm) in the wavelength range classified as blue.

The filter 55 passes through the reflection mirror 433 and enters the rotation axis RA3 along the direction orthogonal to the central axis of the blue light BL (in other words, the rotation along the direction orthogonal to the normal line of the light incident surface of the filter 55). Centering on the axis RA3), it can be rotated in the A3 direction in FIG. Then, the filter 55 is rotated about the rotation axis RA3 by the blue adjustment unit 6B. As a result, the wavelength range of the light that passes through the filter 55 and enters the sensor group 51 out of the blue light that has passed through the reflection mirror 433 is changed.

In this embodiment, the light diffusion layer 52 disposed between the filter 55 and the sensor group 51 is integrated with the filter 55 on the light emission side of the filter 55.
According to this, the distance between the light diffusion layer 52 and the sensor group 51 can be secured relatively long. Therefore, the light diffused by the light diffusion layer 52 can be incident on the sensor group 51, and the incident angle dependency of the sensor group 51 can be canceled. However, the present invention is not limited to this, and the filter 55 and the light diffusion layer 52 may be separate.

The red detection unit 5BR is disposed in the space SP2. This red detection unit 5BR is shown in FIG.
As shown in FIG. 4, in addition to the sensor group 53 and the light diffusion layer 54 similar to the red detection unit 5AR, a filter 56 similar to the filter 55 of the blue detection unit 5BB is provided. That is, the blue detection unit 5BB in the present embodiment does not include the dichroic mirror 432.
This filter 56 has a certain wavelength range (wavelength width) in the wavelength range classified as red light.
The band-pass filter transmits light having a wavelength of 1 and has a configuration in which a dielectric multilayer film is formed on a light-transmitting substrate such as glass. For this reason, when the incident angle of light to the dielectric multilayer film formed on the filter 56 changes, the wavelength range of the transmitted light shifts. The transmission wavelength range of the filter 56 is set to a relatively narrow range (for example, a range of about 15 nm) in the wavelength range classified as red, like the filter 55.

The filter 56 is rotated along a direction orthogonal to the central axis of the red light RL transmitted through the reflection mirror 444 (in other words, along the direction orthogonal to the normal line of the light incident surface of the filter 56). It can be rotated in the A4 direction in FIG. 6 around the rotation axis RA4). The filter 56 is rotated by the red adjustment portion 6R.
4 is turned around. As a result, the wavelength range of the light that passes through the filter 56 and enters the sensor group 53 among the red light that has passed through the reflection mirror 444 is changed.
The light diffusion layer 54 disposed between the filter 56 and the sensor group 53 includes a filter 56.
Is integrated with the filter 56 on the light exit side. However, the present invention is not limited to this, and the filter 56 and the light diffusion layer 54 may be separate.

In the present embodiment, the storage unit 71 includes filters 55 and 5 instead of the above table.
6 rotation angles (rotation angles from the reference position) and the filters 55 and 56 rotated to the rotation angles.
A table (color separation information) in which the wavelength range of the light that passes through is associated with each other is stored.
Then, the peak determination unit 76 determines the peak wavelength and peak luminance of each of blue light and red light, and the image quality adjustment unit 77 adjusts the color balance of the projected image based on these peak wavelength and peak luminance. To do.
Similarly to the above, the detection device 5B includes a green detection unit having a sensor group, a light diffusion layer, and a filter, the adjustment mechanism 6 rotates the filter of the green detection unit, and the control device 7
A configuration may be adopted in which the peak luminance and peak wavelength of green light are determined and the image quality of the projected image is adjusted.

[Effects of Second Embodiment]
According to the projector 1B according to the present embodiment described above, the projector 1A described above.
In addition to the same effects, the following effects can be achieved.
Of the blue light and red light emitted from the light source device 41 and separated by the dichroic mirrors 431 and 432, the filters 55 and 56 formed with the dielectric multilayer film are rotated by the adjusting mechanism 6, respectively. Sensor group 51 emits light in different wavelength ranges.
, 53 can be made incident. According to this, the peak luminance of the blue light and red light can be detected. Also, based on the rotation angle of each filter 55, 56 and the above table,
Peak wavelengths of blue light and red light emitted from the light source device 41 and separated by the mirrors 431 and 432 can be determined. Therefore, even when the wavelength of the light emitted from the light source device 41 changes, the peak wavelength and peak luminance of the light can be reliably determined, and based on these, a projection image with adjusted color balance can be projected.
In the projector 1B, the adjustment mechanism 6 adjusts the angles of the filters 55 and 56. According to this, an image can be projected stably compared with the case where the position of the dichroic mirrors 431 and 432 is changed.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.
The projector according to this embodiment has a configuration similar to that of the projector 1B.
However, in the projector 1B, the filters 55 and 56 and the light diffusion layer 52,
54 and the sensor groups 51 and 53 are arranged separately from each other. In contrast,
In the projector according to this embodiment, the sensor group, the light diffusion layer, and the filter are integrated. In this respect, the projector according to the present embodiment and the projector 1 described above.
It is different from B. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 7 shows a blue detection unit 5C of the detection device 5C included in the projector 1C according to the present embodiment.
FIG. 8 is a schematic diagram illustrating a configuration of a red detection unit 5CR of the detection device 5C.
As shown in FIGS. 7 and 8, the projector 1 </ b> C according to the present embodiment includes a detection device 5 </ b> C instead of the detection device 5 </ b> B, and the adjustment mechanism 6 detects the blue detection unit 5 </ b> CB (
7 has the same configuration and function as the projector 1B except that the red detection unit 5CR (FIG. 8) is rotated.
Similarly to the detection device 5B, the detection device 5C has a blue detection unit 5CB (FIG. 7) for detecting the luminance of the blue light separated by the dichroic mirror 431 and the luminance of the red light separated by the dichroic mirror 432. And a red detecting section 5CR (FIG. 8) for detecting.

The blue detection unit 5CB is disposed in the space SP1 (see FIG. 1). This blue detector 5
As shown in FIG. 7, the CB has a structure in which the sensor group 51, the light diffusion layer 52, and the filter 55 are integrated by a holding member 57.
For this reason, when the filter 55 is rotated in the A3 direction about the rotation axis RA3 by the blue adjustment unit 6B, the entire blue detection unit 5CB is rotated.

The red detection unit 5CR is arranged in the space SP2 (see FIG. 1). Similarly to the blue detection unit 5CB, the red detection unit 5CR has a structure in which the sensor group 53, the light diffusion layer 54, and the filter 56 are integrated by a holding member 58, as shown in FIG.
For this reason, when the filter 56 is rotated in the A4 direction around the rotation axis RA4 by the red adjustment unit 6R, the entire red detection unit 5CR is rotated.

[Effect of the third embodiment]
According to the projector 1C according to the present embodiment described above, the projector 1B described above.
The same effect can be achieved.
When the filters 55 and 56 are rotated by the adjusting mechanism 6, the sensor group 51,
The position 53 is also changed. According to this, the light emitted from the filters 55 and 56 can be reliably incident on the sensor groups 51 and 53. Therefore, the luminance of blue light and red light can be reliably detected.

Further, the blue detection unit 5CB and the red detection unit 5CR of the detection device 5C included in the projector 1C are integrated by holding members 57 and 58. For this reason, the filter 55
, 56 are inclined with respect to the central axis of the incident light, the sensor groups 51, 53 are also inclined.
Since the sensor groups 51 and 53 have the incident angle dependency as described above, the detection accuracy changes when the incident angle of the light with respect to the sensor groups 51 and 53 is changed. On the other hand, the light diffusion layers 52 and 54 include sensor groups 51 and 53 and filters 55 and 56, respectively.
, The incident angle dependence of the sensor groups 51 and 53 can be canceled. Accordingly, the respective luminances of the incident blue light and red light can be stably detected by the sensor groups 51 and 53.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described.
The projector according to the present embodiment has the same configuration and function as the projectors 1A to 1C. Here, in the projectors 1A to 1C, the blue detectors 5AB, 5BB, and 5CB are arranged in the space SP1, and the red detectors 5AR, 5BR,
5CRs were arranged, and the luminance of the incident blue light and red light was detected for each wavelength range by each detection unit. In contrast, in the projector according to the present embodiment, an RGB sensor capable of detecting the luminance of each color light of red, green, and blue is arranged at a position corresponding to the color composition device 453, and the luminance of each color light is detected by the RGB sensor. Is detected. In this respect, the projector according to the present embodiment is different from the projectors 1A to 1C. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 9 is a schematic diagram illustrating a configuration of the projector 1D according to the present embodiment.
The projector 1D according to the present embodiment has the same configuration and function as the projector 1A except that it includes a detection device 5D and an adjustment mechanism 6D (see FIG. 11) instead of the detection device 5A and the adjustment mechanism 6. The characteristics of the dichroic mirrors 431 and 432 are the same as the characteristics of the dichroic mirrors 431 and 432 shown in the second embodiment.
Among these, as shown in FIG. 9, the detection device 5D is opposed to 453A on one end surface orthogonal to the three light incident surfaces 453R, 453G, and 453B and the light emission surface 453S of the color composition device 453. It is provided at the position to Specifically, the detection device 5D is disposed at a position facing the portion on the light emission surface 453S side in the end surface 453A.

FIG. 10 is a schematic diagram illustrating the configuration of the detection device 5D.
As shown in FIG. 10, the detection device 5D has a sensor group 5D1, a filter 5D2, and a light diffusion layer 5D3. The filter 5D2, the light diffusion layer 5D3, and the sensor group 5D1 are sequentially arranged from the light incident side of the detection device 5D. They are stacked in order. That is, the sensor group 5D1, the filter 5D2, and the light diffusion layer 5D3 are integrated.
Red, green, and blue color lights that leak from the end face 453A are incident on the filter 5D2. The filter 5D2 has a configuration in which filter portions 5D2R, 5D2G, and 5D2B that transmit light of each color classified into red, green, and blue are arranged in a matrix. Specifically,
Each filter 5D2 has a configuration in which filter units 5D2R, 5D2G, and 5D2B are repeatedly arranged vertically and horizontally in this order. And each filter part 5D2R, 5D2
The light incident on G and 5D2B transmits light corresponding to each transmission wavelength range, and is incident on the light diffusion layer 5D3.

Here, each filter part 5D2R, 5D2G, 5D2B is a band pass filter formed of a dielectric multilayer film. Among these, the filter unit 5D2R transmits light within a predetermined wavelength range (for example, a range having a wavelength width of 15 nm) in the wavelength range classified as red. Similarly, the filter units 5D2G and 5D2B transmit light within a predetermined wavelength range in the wavelength ranges classified into green and blue, respectively.

The light diffusion layer 5D3 diffuses the light incident from the filter 5D2, and the sensor group 5D
1 has the function of making it incident. More specifically, the light diffusion layer 5D3 includes the filter parts 5D.
Each color light incident from 2R, 5D2G, and 5D2B is diffused and emitted toward the corresponding optical sensor in the sensor group 5D1.

The sensor group 5D1 has a configuration in which a plurality of optical sensors 5D1R, 5D1G, and 5D1B are arranged in a matrix. Specifically, the sensor group 5D1 includes a red sensor 5D1R arranged according to the filter unit 5D2R, a green sensor 5D1G arranged according to the filter unit 5D2G, and a blue sensor arranged according to the filter unit 5D2B. Sensor 5D1B. These photosensors 5D1R, 5D1G, and 5D1B each have a filter portion 5D2R, 5D2G, and a luminance of incident light, that is, out of each color light of red, green, and blue, respectively.
The brightness of the light transmitted through 5D2B is detected. Then, the detected luminance of each color light is output to the control device 7.
Each of the optical sensors 5D1R, 5D1G, and 5D1B has an incident angle dependency as described above. The incident angle dependency is a light diffusion layer 5D3 located on the light incident side of the sensor group 5D1.
Canceled by.

FIG. 11 is a block diagram illustrating a configuration of the projector 1D. In FIG. 11, illustration of a part of the configuration is omitted.
The adjustment mechanism 6D has a driving device such as a stepping motor, similar to the adjustment mechanism 6.
As shown in FIG. 11, the operation is performed based on a drive signal input from the control device 7. The adjustment mechanism 6D rotates the detection device 5D in which the filter 5D2 is integrally provided. Specifically, the adjustment mechanism 6D rotates the filter 5D2 around a rotation axis RA5 (see FIG. 10) along a direction orthogonal to the normal line of the light incident surface in the filter 5D2.

When the detecting device 5D is rotated by the adjusting mechanism 6D, the angle at which the light incident from the end face 453A is incident on the dielectric multilayer film formed in each of the filter portions 5D2R, 5D2G, and 5D2B. (Incident angle) is changed. Since the dielectric multilayer film has the incident angle dependency as described above, each filter portion 5D2R is changed according to the change in the incident angle.
, 5D2G, 5D2B shifts the wavelength range of light passing through.
As described above, the adjustment mechanism 6D rotates the detection device 5D to change the wavelength range of each color light of red, green, and blue that is transmitted through the filter 5D2 and incident on the sensor group 5D1, and the sensor group 5D1. However, by detecting the luminance of each color light incident according to the rotation angle of the detection device 5D, the peak determination unit 76 can determine the peak wavelength and the peak luminance of each color light of red, green, and blue.

Here, instead of the table, the storage unit 71 of the control device 7 is rotated to the rotation angle (rotation angle from the reference position) of the detection device 5D by the adjustment mechanism 6D and the rotation angle. A table in which the wavelength ranges of the red, green, and blue color lights that pass through the filter 5D2 are stored is stored.
And the control apparatus 7 performs the process similar to the said image quality adjustment process, and the peak determination part 76 is performed.
Determines the peak wavelength and peak luminance of each color light, and the image quality adjustment unit 77 controls the lighting of the light source device 41 and the operation of the light modulation device based on the determined peak wavelength and peak luminance of each color light. Perform color adjustment of the projected image including control and the like.
As a result, it is possible to project an image with a proper color balance.

[Effect of Fourth Embodiment]
According to the projector 1D according to the present embodiment described above, the projector 1A described above.
In addition to the same effects, the following effects can be achieved.
The detection device 5D includes a filter 5D2 in which filter units 5D2R, 5D2G, and 5D2B are arranged in a matrix, and an optical sensor 5D1R that detects the luminance of incident light provided according to the filter units 5D2R, 5D2G, and 5D2B. A sensor group 5D1 in which 5D1G and 5D1B are arranged in a matrix. Moreover, such a detection device 5D is rotated by the adjustment mechanism 6D. According to this, although it is classified into the same color (red, green and blue), the luminance of light having different wavelengths can be detected. Therefore, since the peak luminance and peak wavelength of each color light of red, green and blue can be determined, the color balance of the projected image can be adjusted more appropriately.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described.
The projector according to this embodiment has the same configuration as the projectors 1B and 1C. Here, in the projectors 1B and 1C, the wavelength ranges of light incident on the sensor groups 51 and 53 are changed by rotating the filters 55 and 56. On the other hand, in the projector according to the present embodiment, the light sensor is arranged according to a plurality of filter units each having a different transmission wavelength range (separation wavelength range), so that the light is emitted from the light source device without rotating the filter. The peak wavelength and peak luminance of each of the colored lights thus determined are determined. In this respect, the projector according to the present embodiment is different from the projectors 1B and 1C. In the following description, parts that are the same as or substantially the same as those already described are given the same reference numerals and description thereof is omitted.

FIG. 12 shows the detection unit 5 for blue of the detection device 5E provided in the projector 1E according to this embodiment.
It is a schematic diagram which shows the structure of EB.
The projector 1E according to the present embodiment includes a detection device 5E instead of the detection device 5C,
Except not having the adjustment mechanism 6, it has the same configuration and function as the projector 1C.
Similarly to the detection device 5C, the detection device 5E is disposed in the space SP1 (see FIG. 1), and detects the blue light separated by the dichroic mirror 431 (FIG. 12). ) And a red detection unit (not shown) that detects the luminance of the red light that is disposed in the space SP2 (see FIG. 1) and separated by the dichroic mirror 432.

Among these, as shown in FIG. 12, the blue detection unit 5EB includes a sensor group 5E1 and a filter 5E2, and a light diffusion layer 5E3 disposed therebetween.
The sensor group 5E1 has a plurality of optical sensors 5E11 arranged in a matrix, and outputs the luminance detected by each optical sensor 5E11 to the control device 7.
The light diffusion layer 5E3 diffuses the light incident from the filter 5E2 toward the sensor group 5E1 and emits it.

The filter 5E2 has a plurality of filter portions 5E21 arranged in a matrix according to the arrangement state of the photosensors 5E11. These filter parts 5E21 are
Each of them has a relatively narrow constant transmission wavelength range (a range having a constant wavelength width, for example, 15
nm wavelength range). The lower limit wavelength and the upper limit wavelength in the transmission wavelength range of these filter parts 5E21 are different from each other, and depending on any of the filter parts 5E21,
The wavelength range of light classified as blue is continuously covered. And filter part 5E2
1 and the above-described optical sensor 5E11 have a one-to-one correspondence, and the light transmitted through a certain filter unit 5E21 is incident on the corresponding optical sensor 5E11 via the light diffusion layer 5E3, and is received by the optical sensor 5E11. The brightness of the light is detected. Thereby, each optical sensor 5
By comparing the luminance of the light detected by E11, the peak determination unit 76 can determine the peak luminance and peak wavelength of the blue light incident on the filter 5E2.

Although the detection unit for red included in the detection device 5E is omitted in the drawing, similarly to the detection unit for blue 5EB,
It has a sensor group having a plurality of photosensors, a filter having a plurality of filter portions, and a light diffusion layer disposed therebetween.
Among these, the plurality of filter sections each have a certain transmission wavelength range. The lower limit wavelength and the upper limit wavelength of the transmission wavelength range of these filter portions are different in each filter portion, and the wavelength range of red light is continuously covered by any of these filter portions. Therefore, even when the wavelength of the red light emitted from the light source device 41 changes due to the above factors, the red light is transmitted through any one of the plurality of filter units.
Then, any one of the plurality of optical sensors provided in the sensor group detects the luminance of the red light transmitted through the filter unit, and the peak determination unit 76 compares these luminances to enter the filter. The peak brightness and peak wavelength of the emitted red light can be determined.

In the present embodiment, the storage unit 71 stores the wavelength range of blue light and red light that can be transmitted through each filter unit, that is, the wavelength range of blue light and red light detected by each optical sensor. Has been. For this reason, the peak determination part 76 can determine the wavelength of the said light sensor by grasping | ascertaining which optical sensor the light sensor which detected light is.
Based on the respective peak wavelengths and peak luminances of blue light and red light determined in this way, the image quality adjustment unit 77 performs the above processing to appropriately adjust the color balance of the projected image as described above. Can be adjusted.

[Effect of Fifth Embodiment]
According to the projector 1E according to the present embodiment described above, the projector 1B.
In addition to the same effects, the following effects can be achieved.
The detection device 5E includes a filter 5E2 in which a plurality of filter units 5E21 having different lower limit wavelengths and upper limit wavelengths in the transmission wavelength range are arranged, and a sensor group in which a plurality of optical sensors 5E11 provided in accordance with the filter units 5E21 are arranged. 5E1, and a blue detection unit 5EB. Further, the detection device 5E includes a red detection unit similar to the blue detection unit 5EB. According to this, it is possible to determine the peak luminance and the peak wavelength of the blue light and the red light without adjusting the angles of the respective filters. In addition, each filter unit does not have to be an optical filter having a dielectric multilayer film, so that the degree of freedom of filter selection can be improved.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the first to third and fifth embodiments, the detection devices 5A to 5C and 5E detect the luminance of blue light and red light. In the fourth embodiment, the detection device 5D detects the luminance of each color light of red, green, and blue. However, the present invention is not limited to this. For example, as described above, in the configurations shown in the first to third and fifth embodiments, a green detection unit and a green adjustment unit that detect the luminance of green light may be further provided. Moreover, you may comprise so that the brightness | luminance and wavelength of any one color light may be detected and determined among each color light of red, green, and blue.

In each of the above embodiments, the image quality adjustment unit 77 of the control device 7 includes the light source device 41 and the light modulation device 4.
Each of 52 is controlled to adjust the color balance of the projected image. However, the present invention is not limited to this. That is, either the light source device 41 or the light modulation device 452 may be controlled. For example, the image quality adjustment unit 77 may adjust the color balance of the projected image by changing the voltage applied to the light source device 41 and changing the wavelength and luminance of the emitted color light.

In the above embodiments, the detection devices 5A to 5E have the light diffusion layers 52, 54, 5D3, and 5E3. However, the present invention is not limited to this. That is, the light diffusion layer may not be provided, and the arrangement position can be changed as appropriate.
In each said embodiment, the light source device 41 which has the 1st light source part 411 which radiate | emits red light and green light, and the 2nd light source part 419 which radiate | emits blue light was illustrated. However, the present invention is not limited to this. That is, the configuration is not limited as long as the light source device includes a light source unit that can emit light classified into a specific color. For example, a light source device including a red light source unit, a green light source unit, and a blue light source unit that respectively emit red, green, and blue color lights may be employed.

In the fifth embodiment, the filter 5E2 having a plurality of filter parts 5E21 each having a certain transmission wavelength range (separation wavelength range) is mentioned, and the lower limit wavelength and the upper limit wavelength of the transmission wavelength range that each filter part 5E21 has are respectively It was different. However, the present invention is not limited to this. For example, a diffraction grating is provided in place of the filter 5E2, and an optical sensor is disposed at a position where each light separated according to the wavelength by the diffraction grating is incident, thereby determining and detecting the peak wavelength and the peak luminance. It is good also as composition to do.

In the first to third and fifth embodiments, the sensor groups 51, 53, and 5E1 are disposed in the spaces SP1 and SP2, respectively. In the fourth embodiment, the end surface 4 of the color composition device 453 is used.
Suppose that it arrange | positions in the position according to 53A. However, the present invention is not limited to this. That is, the arrangement position of the sensor group may be anywhere. For example, the sensor group constituting the blue detection unit may be provided on the opposite side of the reflection mirror 421 from the light incident side. Further, the sensor group may be configured to be inserted / extracted on the optical path of each color light, and may be configured to detect the brightness of incident light that is inserted on the optical path when detecting the brightness of each color light.
Each sensor group has a configuration in which a plurality of optical sensors are arranged. However, the present invention is not limited to this, and the number of optical sensors may be one in each detection unit.

In each of the above embodiments, the peak determining unit 76 determines the peak luminance and peak wavelength of each color light of red, green, and blue. However, the present invention is not limited to this. For example, the peak determination unit 76
May be configured to determine only the peak luminance of at least one of the three color lights, or may be configured to determine only the peak wavelength.

In each of the above embodiments, the optical unit 4 has been described as having a substantially L-shaped configuration in plan view.
For example, a configuration having a substantially U shape in plan view may be employed.
In each of the above embodiments, the projectors 1A to 1E include the three light modulation devices 452 (452).
R, 452G, 452B). However, the present invention is not limited to this. That is, the present invention can also be applied to a projector using two or less or four or more light modulation devices.
In each of the above embodiments, a light modulation device having a transmissive liquid crystal panel having a different light beam incident surface and light beam emission surface is used. However, a reflection type liquid crystal panel having the same light incident surface and light emission surface is used. A light modulation device having the same may be used. Further, a device using a micromirror, such as a DMD (Digita), can be used as long as it is a light modulation device that can modulate an incident light beam and form an image according to image information.
l Light modulation devices other than liquid crystal, such as those using a micromirror device, may be used.

1A, 1B, 1C, 1D, 1E ... projector, 41 ... light source device, 411 ... first light source unit, 419 ... second light source unit, 452 (452B, 452G, 452R) ... light modulation device, 43
1,432 ... Dichroic mirror (filter), 5A, 5B, 5C, 5D, 5E ... Detection device, 51, 53, 5D1, 5E1 ... Sensor group (sensor device), 52, 54, 5D
3, 5E3: Light diffusion layer, 55, 56, 5D2, 5E2: Filter, 5E21: Filter section, 6, 6D: Adjustment mechanism, 7: Control device.

Claims (8)

A light source device;
A light modulation device that forms an image by modulating light emitted from the light source device;
A projection optical device for projecting an image formed by the light modulation device;
A detection device for detecting the luminance of the first color light separated from the light emitted from the light source device;
A control device that controls at least one of the light source device and the light modulation device according to a detection result by the detection device, and adjusts a color balance of an image projected by the projection optical device;
The detection device includes:
A filter that separates light of a plurality of different wavelength ranges set in advance among the incident first color light;
And a sensor device that detects the luminance of each of the light in the plurality of wavelength ranges separated by the filter. The projector according to claim 1.
The light in the wavelength range of the first color light that is disposed between the light source device and the light modulation device and is included in the light incident from the light source device is different from the light in the wavelength range. A dichroic mirror that transmits one of two colors of light and reflects the other;
An adjustment mechanism for adjusting an angle of the dichroic mirror with respect to a central axis of light incident from the light source device,
The light modulation device includes a first color light modulation device and a second color light modulation device provided in accordance with the first color light and the second color light, respectively.
The filter is the dichroic mirror;
The sensor device is configured such that, every time the angle of the dichroic mirror is adjusted by the adjustment mechanism, the luminance of light in the wavelength range separated by the dichroic mirror according to the angle of the dichroic mirror among the first color light. A projector characterized by detecting The projector according to claim 1.
An adjustment mechanism for adjusting the angle of the filter with respect to the central axis of incident light;
The first color light separated from the light emitted from the light source device is incident on the filter,
Each time the sensor device adjusts the angle of the filter by the adjustment mechanism,
A projector that detects the luminance of light in the wavelength range incident through the filter. The projector according to claim 3.
The projector, wherein the filter and the sensor device are integrated. The projector according to claim 1.
The filter has a plurality of filter portions each having different wavelength ranges of light to be separated,
The sensor device includes a plurality of optical sensors that are provided according to each of the plurality of filter units and detect the luminance of incident light, respectively. The projector according to any one of claims 1 to 5,
The detection device is located between the filter and the sensor device, and has a light diffusion layer that diffuses and emits incident light,
The sensor device includes a plurality of optical sensors that detect the luminance of incident light, respectively. The projector according to any one of claims 1 to 6,
The control device determines a peak wavelength and peak luminance of the first color light based on a detection result by the detection device, and determines the light source device and the light modulation based on the peak wavelength and peak luminance of the first color light. A projector that controls at least one of the devices. The projector according to any one of claims 1 to 7,
The light source device includes a plurality of light source units that independently emit different color lights.

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