JP2019175782A - Light source device, projector, color temperature adjusting method and program - Google Patents

Abstract

To provide a light source device capable of suppressing influences of an intrusion light on a photosensor.SOLUTION: A light source device comprises: multiple light sources 20 which emit mixed color lights; a light combination part 30 which combines the emitted lights from the light sources 20 into one light path 30a; a photosensor 40 which is provided for each of the light sources 20, receives a first light source 20a from the light source 20 and a second light 20b from the other light source 20 and detects the quantity of the received light in each of color components; and a control part 10 which controls a turning-on operation of each of the light sources 20. The control part 10 acquires for each of the light sources 20 a ratio of a detection value of the photosensor 40 in each of the color components in a state where the first light 20a or the second light 20b is received, with respect to a detection value of the photosensor 40 in each of the color components in a state where both the first light 20a and the second light 20b are received, and corrects the detection value of each of the photosensors 40 in each of the color components on the basis of the ratio in a state where all the light sources 20 are turned on.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light source device, a projector, a color temperature adjustment method, and a program.

  A projector is known that projects light (white) emitted from a light source device into a red component (R), a green component (G), and a blue component (B), and projects an image obtained by modulating the light of each color component. In this projector, color temperature adjustment for adjusting the color temperature of the light emitted from the light source device is performed in order to maintain an appropriate white balance.

  Patent Document 1 describes a projector that can adjust the color temperature. This projector has a light source unit and a control unit. The light source unit includes an R color light source, a G color light source, a B color light source, a color composition unit, and an optical sensor. The color synthesizing unit synthesizes the emitted lights of the R color light source, the G color light source, and the B color light source into one optical path. The optical sensor receives a part of the emitted light (white light) of the color synthesizing means and detects the light amount of each color component of RGB. The control unit turns on the R color light source, the G color light source, and the B color light source so that the light quantity ratio of each color component of the emitted light of the color composition unit becomes a predetermined value based on the detection value of each color component of the optical sensor. Control the behavior.

  Among recent projectors, there is a projector provided with a plurality of light sources capable of adjusting the color temperature in order to increase the brightness. In this projector, a light sensor is provided for each light source, and a light combining unit such as a prism combines light emitted from each light source (white light) into one optical path. The control unit adjusts the light amount ratio of each color component based on the detection value of each color component of the optical sensor for each light source with all the light sources turned on.

JP 2007-65012 A

However, a projector that combines light emitted from a plurality of light sources capable of adjusting the color temperature into one light path by a light combining unit has the following problems.
Part of the light emitted from the light source passes through the light combining unit as it is and enters a light sensor provided in another light source as intrusion light. For this reason, the detection value of each color component of the optical sensor includes a component (error) of intrusion light from another light source. Therefore, the light emitted from the light source cannot be accurately adjusted to a desired color temperature.

  In the projector described in Patent Document 1, the influence of intrusion light on the optical sensor is not considered. Therefore, when combining the light emitted from the plurality of light source units into one optical path using the light combining unit, the same problem as described above occurs.

  An object of the present invention is to provide a light source device, a projector, a color temperature adjusting method, and a program that can solve the above-described problems and can suppress the influence of invading light on an optical sensor.

In order to achieve the above object, the light source device of the present invention comprises:
A plurality of light sources that emit mixed color light including a plurality of color components;
A light combining unit that combines the light emitted from each of the plurality of light sources into one optical path;
The second light provided for each light source and emitted from the first light emitted from the light source and another light source other than the light source and passed through the light combining unit without being combined with the optical path. A light sensor that receives light through an optical member, separates the received light into the plurality of color components, and detects a light amount of each color component;
The operation of controlling the lighting operation of the plurality of light sources, and in an operation state in which all of the plurality of light sources are lit, for each light source, the light source based on the detection value of each color component of the photosensor provided in the light source And a controller for adjusting the color temperature of
The controller is
For each light source, in a state where the first light or the second light is received with respect to detection values of the respective color components of the photosensor in a state where both the first light and the second light are received. A ratio of detection values of each color component of the photosensor is acquired, and a detection value of each color component of the photosensor provided in each light source in the operation state is corrected based on the ratio.

The projector of the present invention
The above light source device;
An image forming unit that forms an image by modulating light emitted from the light source device based on an input video signal;
A projection optical system for projecting an image formed by the image forming unit.

The color temperature adjustment method of the present invention includes:
A plurality of light sources that emit mixed color light including a plurality of color components, a light combining unit that combines the light emitted from each light source into a single optical path, and a first light that is provided for each light source and emitted from the light source; The second light emitted from another light source that is a light source other than the light source and passed through the light combining unit without being combined with the optical path is received through the optical member, and the received light is received. A method for adjusting a color temperature of a light source device, comprising: a light sensor that separates the plurality of color components and detects a light amount of each color component;
In the operating state in which all of the plurality of light sources are turned on, for each light source, the color temperature of the light source is adjusted based on the detection value of each color component of the photosensor provided in the light source,
For each light source, in a state where the first light or the second light is received with respect to detection values of the respective color components of the photosensor in a state where both the first light and the second light are received. Obtaining a ratio of detection values of each color component of the photosensor, and correcting a detection value of each color component of the photosensor provided in each light source in the operation state based on the ratio.

The program of the present invention
A plurality of light sources that emit mixed color light including a plurality of color components, a light combining unit that combines the light emitted from each light source into a single optical path, and a first light that is provided for each light source and emitted from the light source; The second light emitted from another light source that is a light source other than the light source and passed through the light combining unit without being combined with the optical path is received through the optical member, and the received light is received. A computer of a light source device having a light sensor that separates the plurality of color components and detects a light amount of each color component;
A procedure for adjusting the color temperature of the light source based on the detection value of each color component of the photosensor provided in the light source for each light source in an operating state in which all of the plurality of light sources are lit.
For each light source, in a state where the first light or the second light is received with respect to detection values of the respective color components of the photosensor in a state where both the first light and the second light are received. Obtaining a ratio of detection values of each color component of the photosensor, and correcting a detection value of each color component of the photosensor provided in each light source in the operation state based on the ratio. It is configured.

  According to the present invention, it is possible to suppress the influence of intrusion light on the optical sensor, and to accurately adjust the color temperature of the light emitted from the light source.

It is a block diagram which shows the structure of the light source device by the 1st Embodiment of this invention. It is a block diagram which shows the structure of the light source device by the 2nd Embodiment of this invention. It is a schematic diagram which shows a mode that a part of emitted light of one light source unit permeate | transmits a right-angle prism, and penetrates into the other light source unit. It is a flowchart which shows one procedure of the correction value acquisition process of an optical sensor. It is a flowchart which shows one procedure of the color temperature adjustment process of a light source unit. It is a block diagram which shows the structure of the projector which is other embodiment of this invention.

Next, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a block diagram showing a configuration of a light source device according to the first embodiment of the present invention.
Referring to FIG. 1, the light source device includes a control unit 10, a plurality of light sources 20, a light combining unit 30, and a plurality of optical sensors 40.

Each light source 20 has the same configuration and emits mixed color light including a plurality of color components. For example, the light source 20 receives supply of current, emits mixed color light (white light) including a red component (R), a green component (G), and a blue component (B), and each color component according to the amount of supplied current. The amount of light and the ratio are changed.
The light combining unit 30 combines the light emitted from each light source 20 into one optical path 30a. The light combining unit 20 can be configured using, for example, a right-angle prism or a V-shaped mirror.

  The optical sensor 40 is provided for each light source 20. The optical sensor 40 emits the first light 20a emitted from the light source 20 and the other light source 20 that is a light source other than the light source 20, and passes through the light combining unit 30 without being combined with the optical path 30a. The light 20b is received through an optical member. The optical sensor 40 separates the received light into each color component and detects the light amount of each color component. The second light 20 b is intrusion light from another light source 20. The optical member has a characteristic of transmitting a part of incident light and reflecting the rest, and is made of, for example, a reflection mirror.

The control unit 10 controls lighting operations of the plurality of light sources 20. In the first operation state in which all of the plurality of light sources 20 are turned on, the control unit 10 determines, for each light source 20, the light source 20 based on the detection value of each color component of the light sensor 40 provided in the light source 20. Adjust the color temperature. For example, the control unit 10 may control the amount of current supplied to the light source 20 so that the color temperature of the light emitted from the light source 20 becomes a predetermined value.
In addition, the control unit 10 for each light source 20 receives the first light 20a or the second light with respect to the detection value of each color component of the optical sensor 40 in a state where both the first light 20a and the second light 20b are received. Based on the ratio of the detection values of the color components of the optical sensor 40 in the state where the light 20b is received, the detection values of the color components of the optical sensor 40 in the first operation state are corrected.

According to the light source device of the present embodiment, the following operational effects are obtained.
In the first operation state in which all the light sources 20 are turned on, the optical sensor 40 receives both the first light 20a from the light source 20 and the second light 20b (intrusion light) from the other light sources 20. . For this reason, the detection value of each color component of the optical sensor 40 includes an intrusion light component (error).
In the present embodiment, in the state in which the first light 20a or the second light 20b is received with respect to the detection value of each color component of the photosensor 40 in the state in which both the first light 20a and the second light 20b are received. Based on the ratio of the detection values of the color components of the optical sensor 40, the detection values of the color components of the optical sensor 40 in the first operating state are corrected. Thereby, the component (error) of the intrusion light can be removed from the detection value of the optical sensor 40, and the color temperature of the light emitted from the light source 20 can be adjusted accurately.

In the light source device of the present embodiment, for each light source 20, the control unit 10 turns on both the light source 20 and the other light sources 20, acquires the first detection value of each color component of the optical sensor 40, and the other light sources. Only 20 may be lit and the second detection value of each color component of the optical sensor 40 may be acquired. In this case, the control unit 10 corrects the detection value of each color component of the optical sensor 40 in the first operation state based on the ratio of the second detection value to the first detection value.
Further, in the light source device of the present embodiment, for each light source 20, the control unit 10 turns on the light source 20 and all the other light sources 20, acquires the first detection value of each color component of the optical sensor 40, and Only the light source 20 may be turned on and the second detection value of each color component of the optical sensor 40 may be acquired. In this case, the control unit 10 corrects the detection value of each color component of the optical sensor 40 in the first operation state based on the ratio of the second detection value to the first detection value.

Furthermore, in the light source device of the present embodiment, the light combining unit 30 may be an optical system that forms the light source images of the first and second light sources in different regions on the same imaging plane. This optical system has a first reflecting surface that reflects the first light beam from the first light source 20 toward the imaging surface, and a second light beam from the second light source 20 toward the imaging surface. And a second reflecting surface for reflecting. When viewed from a direction perpendicular to the plane orthogonal to the first and second reflecting surfaces, the apex angle portion, which is the junction of the first and second reflecting surfaces, is incident on the first reflecting surface. Are arranged on the inner side of the outermost peripheral portion of the second luminous flux and the second luminous flux incident on the second reflecting surface. The reflective element is, for example, a right-angle prism or a V-shaped mirror.
In the above case, part of the light emitted from the first light source 20 passes through the reflective element and enters the optical sensor 40 on the second light source 20 side as intrusion light. Similarly, part of the light emitted from the second light source 20 passes through the reflective element and enters the optical sensor 40 on the first light source 20 side as intrusion light.

(Second Embodiment)
FIG. 2 is a block diagram showing the configuration of the light source device according to the second embodiment of the present invention.
Referring to FIG. 2, the light source device includes light source units 1 and 2, a control unit 3, and a right-angle prism 4.

The light source units 1 and 2 are examples of light sources that emit mixed color light (for example, white light) including a plurality of color components.
The light source unit 1 includes a driver 11, a laser element 12, a reflection mirror 13, and an optical sensor 14. The driver 11 supplies a drive current to the laser element 12. The laser element 12 receives supply of current from the driver 11 and emits mixed color light (white light) including a red component (R), a green component (G), and a blue component (B), according to the amount of supplied current. The light amount and the ratio of each color component are configured to change. For example, the laser element 12 may be configured from a plurality of laser light sources such as a laser diode (LD), or may be configured by combining a laser light source and a phosphor.

The reflection mirror 13 is an example of an optical member having a characteristic that transmits a part of incident light and reflects the rest. The reflection mirror 13 reflects the light emitted from the laser element 12 toward the right-angle prism 4.
The optical sensor 14 is disposed on the back surface (the surface opposite to the surface on which the emitted light of the laser element 12 is incident) of the reflection mirror 13. The optical sensor 14 receives the light transmitted through the reflection mirror 13, separates the received light into RGB color components, and detects the light amount of each color component. The optical sensor 14 transmits a detection signal indicating the result of detecting the light amount of each color component to the control unit 3.

  The light source unit 2 has basically the same configuration as the light source unit 1. The light source unit 2 includes a driver 21, a laser element 22, a reflection mirror 23, and an optical sensor 24. Since the driver 21, laser element 22, reflection mirror 23, and optical sensor 24 are the same as the driver 11, laser element 12, reflection mirror 13, and optical sensor 14, detailed description thereof is omitted here. .

  The right-angle prism 4 is an example of a light combining unit that combines light emitted from a plurality of light sources into one optical path. The right-angle prism 4 has a first surface 4a and a second surface 4b that are perpendicular to each other. Light emitted from the light source unit 1 (reflected light from the reflection mirror 13) is incident on the first surface 4a at an incident angle of approximately 45 °, and light emitted from the light source unit 2 (reflected light from the reflection mirror 23) is approximately 45. The light enters the second surface 4b at an incident angle of °. The first surface 4a and the second surface 4b reflect the light emitted from the light source units 1 and 2 in the same direction. The right-angle prism 4 and the light source units 1 and 2 are arranged so that the reflected light from the first surface 4a and the second surface 4b forms one optical path.

A part of the light emitted from the light source unit 1 passes through the right-angle prism 4 and enters the light source unit 2. FIG. 3 schematically shows how a part of the light emitted from the light source unit 1 penetrates the right-angle prism 4 and enters the light source unit 2.
As shown in FIG. 3, a part of the light emitted from the light source unit 1 enters the right-angle prism 4 from the first surface 4a. In the right-angle prism 4, the light incident from the first surface 4 a is emitted toward the reflecting mirror 23 from the second surface 4 b. Light emitted from the second surface 4 b is intrusion light, and part of the light is transmitted through the reflection mirror 23 and incident on the optical sensor 24.

  Similar to the light source unit 1, part of the light emitted from the light source unit 2 passes through the right-angle prism 4 and enters the light source unit 1. In the right-angle prism 4, the light incident from the second surface 4 b is emitted from the first surface 4 a toward the reflection mirror 13. The light emitted from the first surface 4 a is intrusion light, and part of the light is transmitted through the reflection mirror 13 and incident on the optical sensor 14.

Reference is again made to FIG. The control unit 3 includes a CPU (Central Processing Unit) and the like, and can communicate with each of the light source units 1 and 2. For example, serial communication using UART (Universal Asynchronous Receiver / Transmitter) or SPI (Serial Peripheral Interface) can be applied to the communication between the control unit 3 and the light source units 1 and 2.
The control unit 3 controls the current supply operation of the drivers 11 and 21 (lighting operation of the laser elements 12 and 22), and turns on the colors for the light source units 1 and 2 with the laser elements 12 and 22 turned on together. Perform temperature adjustment processing. Specifically, the control unit 3 controls the current supply operation of the driver 11 based on the detection value of each color component of the optical sensor 14 so that the color temperature of the light emitted from the laser element 12 becomes a predetermined value. The control unit 3 controls the current supply operation of the driver 21 so that the color temperature of the light emitted from the laser element 22 becomes a predetermined value based on the detection value of each color component of the optical sensor 24.

  In adjusting the color temperature of the laser element 12, not only light from the laser element 12 but also intrusion light from the light source unit 2 enters the optical sensor 14. For this reason, the control unit 3 performs correction for removing the influence of the intruding light on the detection value of each color component of the optical sensor 14. Similarly, the control unit 3 performs correction for removing the influence of the intruding light on the detection value of each color component of the optical sensor 24.

Hereinafter, the correction process of the optical sensors 14 and 24 and the color temperature adjustment process of the light source units 1 and 2 will be specifically described.
First, processing for obtaining correction values of the optical sensors 14 and 24 will be described.
FIG. 4 is a flowchart showing a procedure of the correction value acquisition process of the optical sensor. In FIG. 4, the lower case “x” indicates the number of the light source unit.

  First, the control unit 3 sets a variable (step S10). “LUx_INT_R”, “LUx_INT_G”, and “LUx_INT_B” indicate the R component, G component, and B component of the intrusion light, respectively. “LUx_FULL_R”, “LUx_FULL_G”, and “LUx_FULL_B” respectively indicate the R component, G component, and B component of light measured by the light sensor of the light source unit x with all the light source units turned on. “LUx_RATIO_R”, “LUx_RATIO_G”, and “LUx_RATIO_B” are the ratios of the R component, G component, and B component of the intrusion light amount based on the R component, G component, and B component light amounts measured by the light sensor of the light source unit x, respectively. Indicates the value. The control unit 3 substitutes “0” that is an initial value for all variables.

Next, the control unit 3 turns on all other light source units except the light source unit x at the maximum output (step S11).
Next, the control unit 3 detects each color component of RGB with the light sensor of the light source unit x. Then, the control unit 3 substitutes the R light value, G light value, and B light value detected by the light sensor of the light source unit x into “LUx_INT_R”, “LUx_INT_G”, and “LUx_INT_B”, respectively (step S12).

Next, the control unit 3 turns on all the light source units including the light source unit x with the maximum output (step S13).
Next, the control unit 3 detects each color component of RGB with the light sensor of the light source unit x. Then, the control unit 3 substitutes the R light value, G light value, and B light value detected by the light sensor of the light source unit x into “LUx_FULL_R”, “LUx_FULL_G”, and “LUx_FULL_B”, respectively (step S14).

Finally, the control unit 3 substitutes a value obtained by dividing the R light value of “LUx_INT_R” by the R light value of “LUx_FULL_R” into “LUx_RATIO_R” as a ratio value of the R component. Similarly, the control unit 3 substitutes a value obtained by dividing the G light value of “LUx_INT_G” by the G light value of “LUx_FULL_G” into “LUx_RATIO_G” as a G component ratio value, and sets the B light value of “LUx_INT_B” to “ The value divided by the B light value of “LUx_FULL_B” is substituted into “LUx_RATIO_B” as the ratio value of the B component (step S15).
By performing the processes of steps S10 to S15 for the light source units 1 and 2 shown in FIG. 2, “LUx_RATIO_R”, “LUx_RATIO_G”, and “LUx_RATIO_B” are obtained as the correction values of the optical sensors 14 and 24, respectively.

Next, the color temperature adjustment process of the light source units 1 and 2 will be described.
FIG. 5 is a flowchart showing a procedure of color temperature adjustment processing of the light source unit. As in FIG. 4, also in FIG. 5, the lowercase “x” indicates the number of the light source unit.

First, the control unit 3 turns on all the light source units including the light source unit x with the maximum output (step S20).
Next, the control unit 3 detects each color component of RGB with the light sensor of the light source unit x (step S21).

  Next, the control unit 3 obtains “LUx_RATIO_R”, “LUx_RATIO_G”, and “LUx_RATIO_B” obtained in step S15 of FIG. 4 respectively for the R light value, G light value, and B light value detected by the light sensor of the light source unit x. Use to correct. Specifically, the control unit 3 sets “LUx_R” as a value obtained by multiplying the R light value detected in step S21 by “1-LUx_RATIO_R”. Similarly, the control unit 3 sets “LUx_G” as a value obtained by multiplying the G light value by “1-LUx_RATIO_G”, and sets “LUx_B” as a value obtained by multiplying the B light value by “1-LUx_RATIO_B” (step S22). .

Finally, the control unit 3 adjusts the light source unit x so that the color temperature of the light emitted from the light source unit x becomes a predetermined value based on “LUx_R”, “LUx_G”, and “LUx_B” acquired in step S22. The current supplied to the laser element is adjusted (step S23).
By performing the processes of steps S20 to S23 on the light source units 1 and 2 shown in FIG. 2, the intrusion light component (error) can be removed from the detection values of the optical sensors 14 and 24. As a result, the color temperature of the light emitted from the light source units 1 and 2 can be accurately calculated, and the light emitted from the light source units 1 and 2 can be maintained at a desired color temperature.

4 and 5 described above may be performed at an arbitrary timing or periodically. For example, the processing of FIGS. 4 and 5 described above may be performed when the light source device is turned on or started.
Although the two light source units 1 and 2 are used in the light source device of the present embodiment, the number of light source units may be three or more. It is possible to apply a configuration in which light emitted from a plurality of light source units is combined into one optical path using a light combining unit including a right-angle prism or the like.

In the light source device of the present embodiment, the light combining unit including the right-angle prism 4 may be configured so that the light source images of the light source units 1 and 2 are formed in different regions on the same imaging plane. For example, the light combining unit includes a first double-sided telecentric optical system, a second double-sided telecentric optical system, and a right-angle prism 4.
The light emitted from the light source unit 1 is incident on the first surface 4a of the right-angle prism 4 through the first both-side telecentric optical system. The angle formed by the optical axis of the first both-side telecentric optical system and the first surface 4a is 45 °. The light emitted from the light source unit 2 is incident on the second surface 4b of the right-angle prism 4 through the second both-side telecentric optical system. The angle formed by the optical axis of the second both-side telecentric optical system and the second surface 4b is 45 °.

  The right-angle prism 4 is arranged so that vignetting occurs in the light emitted from the light source units 1 and 2 (light flux) at the apex portion formed by the first surface 4a and the second surface 4b. Specifically, when viewed from a direction perpendicular to the surface orthogonal to the first surface 4a and the second surface 4b, the apex angle portion that is a joint portion between the first surface 4a and the second surface 4b is The light beam incident on the first surface 4a and the light beam incident on the second surface 4b are disposed inside the outermost peripheral portion. In this case, light that has passed through the apex portion (corresponding to the vignetting portion) becomes intrusion light.

In the above-described light combining unit, a V-shaped mirror may be used instead of the right-angle prism 4. The V-shaped mirror has a first reflecting surface corresponding to the first surface 4a and a second reflecting surface corresponding to the second surface 4b. The V-shaped mirror is arranged so that the first and second reflecting surfaces form a right angle with each other, and the reflected light from the first and second reflecting surfaces forms one optical path. The apex angle portion, which is a joint between the first and second reflecting surfaces, is disposed on the inner side of the outermost peripheral portion of the light beam incident on the first reflecting surface and the light beam incident on the second reflecting surface. In this case, light that has passed through the apex portion (corresponding to the vignetting portion) becomes intrusion light.
The above-described photosynthesis unit can also be applied to the light source device of the first embodiment.

(Other embodiments)
FIG. 6 is a block diagram showing a configuration of a projector according to another embodiment of the present invention.
Referring to FIG. 6, the projector includes a light source device 50, an image forming unit 51, and a projection lens 52. The light source device 50 is the light source device of the first or second embodiment described above.

  The image forming unit 51 modulates the light emitted from the light source device 50 based on the input video signal S1 to form an image. Specifically, the image forming unit 51 includes a display panel that separates white light, which is light emitted from the light source device 50, into a plurality of color lights and modulates each color light spatially / temporally to form an image. As the display panel, a DMD (digital mirror device), a liquid crystal display panel, or the like can be used. The projection lens 52 enlarges and projects the image formed by the image forming unit 51 on the projection surface.

Although the present invention has been described with reference to the embodiments, the present invention is not limited to the above-described embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
In the first and second embodiments, the present invention has been described as a hardware configuration, but the present invention is not limited to this. The present invention can also be realized by causing a CPU to execute a computer program (hereinafter referred to as a program) in which processing contents performed by the control unit of the light source device are described as procedures. Here, the CPU operates as a computer that executes a program read from a recording medium on which the program is recorded.

  This program can be stored in various types of non-transitory computer readable media and provided to a computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), and CD-ROMs (Compact Disc-Read Only Memory). , CD-R, CD-R / W, DVD (Digital Versatile Disc), Blu-ray (registered trademark) Disc, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory). Further, the program may be supplied to a computer by various types of temporary computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

DESCRIPTION OF SYMBOLS 10 Control part 20 Light source 20a 1st light 20b 2nd light 30 Photosynthesis part 30a Optical path 40 Optical sensor

Claims (6)

A plurality of light sources that emit mixed color light including a plurality of color components;
A light combining unit that combines the light emitted from each of the plurality of light sources into one optical path;
The second light provided for each light source and emitted from the first light emitted from the light source and another light source other than the light source and passed through the light combining unit without being combined with the optical path. A light sensor that receives light through an optical member, separates the received light into the plurality of color components, and detects a light amount of each color component;
The operation of controlling the lighting operation of the plurality of light sources, and in an operation state in which all of the plurality of light sources are lit, for each light source, the light source based on the detection value of each color component of the photosensor provided in the light source And a controller for adjusting the color temperature of
The controller is
For each light source, in a state where the first light or the second light is received with respect to detection values of the respective color components of the photosensor in a state where both the first light and the second light are received. A light source device that obtains a ratio of detection values of each color component of the photosensor and corrects a detection value of each color component of the photosensor provided in each light source in the operation state based on the ratio. The controller is
For each of the light sources, turn on all of the light sources and the other light sources, obtain a first detection value of each color component of the light sensor, turn on only the other light sources, and turn on each of the color components of the light sensor. 2 detection values are obtained,
The light source device according to claim 1, wherein the ratio is a ratio of the second detection value to the first detection value. The controller is
For each light source, turn on all of the light sources and the other light sources, obtain a first detection value of each color component of the light sensor, turn on only the light source, and turn on the second of each color component of the light sensor. Get the detection value,
The light source device according to claim 1, wherein the ratio is a ratio of the second detection value to the first detection value. The light source device according to any one of claims 1 to 3,
An image forming unit that forms an image by modulating light emitted from the light source device based on an input video signal;
A projection optical system that projects an image formed by the image forming unit. A plurality of light sources that emit mixed color light including a plurality of color components, a light combining unit that combines the light emitted from each light source into a single optical path, and a first light that is provided for each light source and emitted from the light source; The second light emitted from another light source that is a light source other than the light source and passed through the light combining unit without being combined with the optical path is received through the optical member, and the received light is received. A method for adjusting a color temperature of a light source device, comprising: a light sensor that separates the plurality of color components and detects a light amount of each color component;
In the operating state in which all of the plurality of light sources are turned on, for each light source, the color temperature of the light source is adjusted based on the detection value of each color component of the photosensor provided in the light source,
For each light source, in a state where the first light or the second light is received with respect to detection values of the respective color components of the photosensor in a state where both the first light and the second light are received. Obtaining a ratio of detection values of each color component of the photosensor, and correcting a detection value of each color component of the photosensor provided in each light source in the operating state based on the ratio Method. A plurality of light sources that emit mixed color light including a plurality of color components, a light combining unit that combines the light emitted from each light source into a single optical path, and a first light that is provided for each light source and emitted from the light source; The second light emitted from another light source that is a light source other than the light source and passed through the light combining unit without being combined with the optical path is received through the optical member, and the received light is received. A computer of a light source device having a light sensor that separates the plurality of color components and detects a light amount of each color component;
A procedure for adjusting the color temperature of the light source based on the detection value of each color component of the photosensor provided in the light source for each light source in an operating state in which all of the plurality of light sources are lit.
For each light source, in a state where the first light or the second light is received with respect to detection values of the respective color components of the photosensor in a state where both the first light and the second light are received. Obtaining a ratio of detection values of each color component of the photosensor, and correcting a detection value of each color component of the photosensor provided in each light source in the operation state based on the ratio. Program.

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