JP2014062974A - Light source device, projection apparatus and light source control method - Google Patents

Abstract

An accurate control method is obtained for each type of light emitting element based on synthesized light from a plurality of types of light emitting elements having different emission wavelengths.
An LD array 31 provided with two types of LDs each having a different wavelength in a blue region, a mirror array 32 that emits combined light emitted from the LD array 31 into the same light beam, and the emitted light On the other hand, the filter 38p that transmits only the higher wavelength, the color wheel 38 that selectively arranges the filter 38s that transmits only the lower wavelength, and the transmitted light at the timing of transmitting the filter 38p and the timing of transmitting the filter 38s, respectively. The CPU 18 and the projection processing unit 13 control the power for driving the LD array 31 based on the obtained synthesis ratio.
[Selection] Figure 2

Description

  The present invention relates to a light source device, a projection device, and a light source control method particularly suitable for a DLP (registered trademark) type projector device using a semiconductor light emitting element as a light source.

  In a projector including a light source device having a plurality of light emitting elements, a configuration is considered that includes two types of light emitting elements having different emission wavelengths and a light source device that emits light in a state where these lights are combined. (For example, Patent Document 1)

JP 2005-189277 A

  In the light emitting element, the relationship between the power to be supplied and the amount of light to be emitted varies depending on the temperature, and the degree of the variation varies depending on the type of transmission. Therefore, the light source device using a plurality of light emitting elements having different emission wavelengths as shown in the technique described in the above-mentioned patent document, when the relationship between the power to be supplied and the output light quantity changes depending on the temperature, As a result of the difference in the degree of change for each, the wavelength of the combined light and the light emission luminance deviate from the set contents.

  In this case, if the wavelength of the synthesized light can be measured, it will be possible to adjust the balance of driving power for each type of light emitting element. However, since there is currently no device for measuring the wavelength of light that is small and inexpensive enough to be incorporated in a device such as a projector, a light source adjustment method for measuring the wavelength is not practical.

  Therefore, the combined ratio of the light emitted from each light emitting element cannot be known from the combined light, and there is no way of knowing how to control each light emitting element to obtain the desired combined light.

  The present invention has been made in view of the above circumstances, and its object is to provide an accurate control method for each type of light emitting element based on synthesized light from a plurality of types of light emitting elements having different emission wavelengths. A light source device, a projection device, and a light source control method.

  One embodiment of the present invention includes a first light-emitting element that emits light having a first wavelength, a second light-emitting element that emits light having a second wavelength different from the first wavelength, and the first light-emitting element. Condensing means for emitting the light emitted from the light emitting element and the second light emitting element together in the same luminous flux, and first light that transmits only the light having the first wavelength with respect to the light emitted from the light collecting means. A light separating means in which a second transmissive region that transmits light including light of the second wavelength is disposed, the illuminance of the light transmitted through the first transmissive region, and the second Illuminance measuring means for measuring the illuminance of the light transmitted through the transmission region, light emitted from the first light emitting element and light emitted from the second light emitting element based on the measurement result of the illuminance measuring means A calculation means for calculating a synthesis ratio, and the first light emitting element and the above-mentioned by the synthesis ratio obtained by the calculation means Characterized by comprising a driving control means for controlling the power for driving the second light-emitting element.

  According to the present invention, it is possible to obtain an accurate control method for each type of each light emitting element based on the combined light from a plurality of types of light emitting elements having different emission wavelengths.

1 is a block diagram showing a schematic functional configuration of a projector apparatus according to an embodiment of the present invention. The figure which shows the structural example of the light source part which concerns on the same embodiment. The figure which shows the positional relationship of the color wheel which concerns on the embodiment, and an illumination intensity sensor. The figure which shows the other positional relationship of the color wheel which concerns on the embodiment, and an illumination intensity sensor. 6 is a flowchart showing a setting operation of driving power (current) for two types of LDs in the LD array according to the amount of light received by the illuminance sensor according to the embodiment. 9 is a flowchart showing another setting operation of driving power (current) for two types of LDs in the LD array according to the amount of light received by the illuminance sensor according to the embodiment.

  An embodiment in which the present invention is applied to a DLP (registered trademark) projector will be described below with reference to the drawings.

  FIG. 1 is a diagram showing a schematic functional configuration of a projector apparatus 10 according to the present embodiment. The input unit 11 includes, for example, a pin jack (RCA) type video input terminal, a D-sub 15 type RGB input terminal, and the like. Analog image signals of various standards input to the input unit 11 are digitized by the input unit 11 and then sent to the image conversion unit 12 via the system bus SB.

  The image conversion unit 12 is also referred to as a scaler, and the input image data is unified into image data of a predetermined format suitable for projection and sent to the projection processing unit 13.

  The projection processing unit 13 multiplies a frame rate according to a predetermined format, for example, 120 [frames / second], the number of color component divisions, and the number of display gradations, in accordance with the transmitted image data. The micromirror element 14 is driven to display by a time-sharing drive.

  This micromirror element 14 is turned on / off individually at a high speed for each inclination angle of a plurality of micromirrors arranged in an array, for example, WXGA (Wide eXtended Graphics Array) (horizontal 1280 pixels × vertical 800 pixels). By displaying the image, an optical image is formed by the reflected light.

On the other hand, light of a plurality of colors including primary color lights of R, G, and B is sequentially emitted in a time division manner from the light source unit 15 in a time division manner. The light from the light source unit 15 is totally reflected by the mirror 16 and applied to the micromirror element 14.
Then, an optical image is formed by the reflected light from the micromirror element 14, and the formed optical image is projected and displayed on a screen (not shown) to be projected via the projection lens unit 17.

  Note that the projection processing unit 13 directly executes control such as drive timing of the light emitting elements in the light source unit 15 described later under the control of the CPU 18.

  The CPU 18 controls all the operations of the above circuits. The CPU 18 is directly connected to the main memory 19 and the program memory 20. The main memory 19 is composed of, for example, an SRAM and functions as a work memory for the CPU 18. The program memory 20 is composed of an electrically rewritable nonvolatile memory, and stores an operation program executed by the CPU 18 and various fixed data. The CPU 18 executes a control operation in the projector device 10 using the main memory 19 and the program memory 20.

The CPU 18 performs various projection operations according to key operation signals from the operation unit 21.
The operation unit 21 includes a key operation unit provided in the main body of the projector device 10 and an infrared light receiving unit that receives infrared light from a remote controller (not shown) dedicated to the data projector device 10. A key operation signal based on a key operated by the operation unit or the remote controller is directly output to the CPU 18.

  The CPU 18 is further connected to the audio processing unit 22 via the system bus SB. The sound processing unit 22 includes a sound source circuit such as a PCM sound source, converts the sound data given during the projection operation into an analog signal, drives the speaker unit 23 to emit a loud sound, or generates a beep sound or the like as necessary.

The configuration of the optical system when the light source unit 15 is configured using two types of semiconductor light emitting elements will be described with reference to FIG.
The light source unit 15 includes, as a light source, an LD (laser diode, semiconductor laser) array 31 that is a semiconductor light emitting element that emits blue laser light.
In this LD array 31, for example, a total of 24 LDs of 8 × 3 (vertical direction in the drawing) are arranged in an array. In this LD array 31, two types of LDs, each of which belongs to a blue wavelength band and emits a shorter wavelength, and an LD that emits a longer wavelength, are alternately arranged in a checkered pattern, each of which is 12 pieces. Arranged. Then, the driving power (current) by the projection processing unit 13 is adjusted for each emission wavelength, and the light emission state is controlled.

  The blue laser light emitted from the LD array 31 is reflected at an angle of 90 ° by the mirror array 32 arranged in a stepped manner so as to face the LD array 31, condensed by the lenses 33 and 34, and a parallel light beam. Then, the light passes through the dichroic mirror 35 that transmits blue light and red light and reflects green light, and irradiates the rotating surface of the color wheel 38 (rotary body) as a part of the light source via the lenses 36 and 37. Is done.

  The color wheel 38 is rotated by being driven by a motor (M) 39 that is a rotation driving unit, and a transmission diffusion plate 38b and a phosphor layer 38g are provided on a rotation surface of the circular wheel as two circular arc regions. It is divided and arranged. In the present embodiment, the color wheel 38 and the motor 39 serve as a rotating body.

  Further, two arc-shaped specific wavelength transmission filters 38p and 38s (transmission areas) as light separating means are provided on the inner peripheral side with respect to the arc-shaped position where the transmission diffusion plate 38b of the color wheel 38 is located. Provided on the same circumference. That is, the specific wavelength transmission filters 38p and 38s are installed on the rotating body.

  These two specific wavelength transmission filters 38p and 38s correspond to two types of LDs having different wavelengths constituting the LD array 31. That is, one specific wavelength transmission filter 38p transmits only blue light having a longer wavelength. The other specific wavelength transmission filter 38s transmits only blue light having a shorter wavelength.

  The rotation synchronization of the color wheel 38 is controlled by the projection processing unit 13 detecting and rotating the marker formed on the peripheral surface (not shown).

  At the peripheral surface position where the phosphor layer 38g of the color wheel 38 is located, the phosphor is applied to the surface irradiated with the laser light from the LD array 31 to form the phosphor layer, and the phosphor layer 38g is formed. A reflective plate is provided on the back surface of the surface to overlap the phosphor layer.

  When the phosphor layer 38g of the color wheel 38 is on the optical path of the laser light from the LD array 31, the phosphor layer 38g is excited by irradiation with blue laser light and emits green light.

  The green light emitted from the color wheel 38 is uniformly guided to the lenses 37 and 36 by the reflecting plate formed on the back side of the phosphor layer 38g and reflected by the dichroic mirror 35.

  The green light reflected by the dichroic mirror 35 transmits blue light through the lens 41, is reflected by the dichroic mirror 42 that reflects green light and red light, and then passes through the lens 43 and passes through the integrator 44. The light distribution is uniform. The green light emitted from the integrator 44 is further reflected by the mirror 46 via the lens 45, reflected by the mirror 16 via the lens 47, and then irradiated to the micromirror element 14 via the lens 48.

  An optical image is formed by the reflected light from the micromirror element 14 toward the projection lens unit 17, and the optical image is not projected by the projection lens unit 17 via the lens 48. Irradiated to the screen.

  Further, when the transmission diffusion plate 38 b of the color wheel 38 is on the optical path of the laser light from the LD array 31, the blue light transmitted through the diffusion plate 38 b while being diffused is mirrored through the lens 50. After being reflected by 51 and further reflected by the mirror 53 via the lens 52, the light passes through the dichroic mirror 42, passes through the integrator 44 via the lens 43, and becomes a luminous flux having a uniform luminance distribution. The blue light emitted from the integrator 44 is further reflected by the mirror 46 via the lens 45 and reaches the mirror 16 via the lens 47.

  Further, when the transmission diffusion plate 38b of the color wheel 38 is on the optical path of the laser light from the LD array 31, the blue light transmitted through the diffusion plate 38b while diffusing through the diffusion plate 38b as described above passes through the lens 50. In this process, a very small portion of the lens 50, for example, less than 1% of the transmitted light amount is reflected.

  The reflected light is partially transmitted by the specific wavelength transmission filter 38p or 38s of the color wheel 38 and received by the illuminance sensor LS located on the LD array 31 side with the color wheel 38 interposed therebetween.

  The illuminance sensor LS is disposed in the vicinity of the lens 37 and detects the amount of reflected light from the lens 50 that has passed through the specific wavelength transmission filter 38p or 38s.

Further, the light source unit 15 includes an LED (light emitting diode) 55, which is a semiconductor light emitting element that emits red light, as a light source.
The red light emitted from the LED 55 passes through the dichroic mirror 35 through the lenses 56 and 57, is reflected by the dichroic mirror 42 through the lens 41, and then passes through the integrator 44 through the lens 43. The light distribution is uniform. The red light emitted from the integrator 44 is further reflected by the mirror 46 via the lens 45 and reaches the mirror 16 via the lens 47.

Next, the operation of the above embodiment will be described.
FIG. 3 is a diagram showing a positional relationship with the illuminance sensor LS when the light diffusing plate 38 b of the light source unit 15, particularly the color wheel 38, is located in the optical path from the LD array 31. As shown in FIG. 3A, when the transmission diffusion plate 38 b of the color wheel 38 is located in the optical path from the LD array 31, the blue light that has been transmitted through the transmission diffusion plate 38 b and diffused through the lens 50. And reflected by the mirror 51.

  At this time, as described above, a part of the blue light transmitted through the lens 50 is reflected by the specific wavelength transmission filter 38p of the color wheel 38 as indicated by an arrow in the drawing. Light is received by the illuminance sensor LS through the specific wavelength transmission filter 38s.

  FIG. 3B shows the relationship between the transmission diffusion plate 38b of the color wheel 38, the specific wavelength transmission filter 38p and the specific wavelength transmission filter 38s arranged on the inner peripheral side thereof. As described above, the LD array 31 is composed of two types of LDs having different emission wavelengths even in the blue wavelength band, and the specific wavelength transmission filter 38p of the color wheel 38 has a longer wavelength blue light. The specific wavelength transmission filter 38s transmits only blue light having a shorter wavelength.

  FIG. 3C-1 shows that when the color wheel 38 rotates in the rotation direction RT, the partially reflected light from the lens 50 passes through the illuminance sensor specific wavelength transmission filter 38s and is received by the illuminance sensor LS. Indicates the state.

  At this time, since the specific wavelength transmission filter 38s transmits only blue light from the LD emitting a shorter wavelength corresponding to the two types of LDs constituting the LD array 31, the detection amount by the illuminance sensor LS is It is proportional to the amount of light emitted from an LD emitting a shorter wavelength.

  On the other hand, FIG. 3C-2 shows that when the color wheel 38 rotates in the rotation direction RT, the partially reflected light from the lens 50 passes through the specific wavelength transmission filter 38p and is received by the illuminance sensor LS. State.

  At this time, the specific wavelength transmission filter 38p transmits only blue light from the LD that emits the longer wavelength corresponding to the two types of LDs constituting the LD array 31, and thus the detection amount by the illuminance sensor LS. Is proportional to the amount of light emitted by the LD emitting longer wavelengths.

  2 and 3, the specific wavelength transmission filter 38p of the color wheel 38 corresponds to the two types of LDs constituting the LD array 31 and emits the blue light from the LD that emits the longer wavelength. However, instead of this, the specific wavelength transmission filter 38p may be an opening in a so-called “through” state.

  In this case, the specific wavelength transmission filter 38p transmits the reflected light from the lens 50, that is, the blue light having two different wavelengths corresponding to the two types of LDs constituting the LD array 31, and thus the illuminance sensor. The amount detected by LS is proportional to the total amount of blue light emitted as the combined light of the LD array 31.

  2 and 3, the illuminance sensor LS is positioned on the LD array 31 side with respect to the color wheel 38, and the illuminance sensor reflects the reflected light from the lens 50 via the specific wavelength transmission filter 38p or the specific wavelength transmission filter 38s. Although the light is received by the LS, the position of the illuminance sensor LS is not limited to this.

  For example, FIG. 4 shows a case where the illuminance sensor LS is positioned on the side opposite to the LD array 31 with respect to the color wheel 38. In this figure, when the blue light from the LD array 31 passes through the transmission diffusion plate 38b of the color wheel 38 through the lens 37, a part of the light is reflected by the lens 37, and the color as shown by the arrows in the figure. The state which permeate | transmits the specific wavelength transmission filter 38p or the specific wavelength transmission filter 38s of the wheel 38 and reaches the illumination intensity sensor LS is illustrated.

  Even when such an arrangement of the illuminance sensor LS is adopted, the specific wavelength transmission filter 38p of the color wheel 38 emits the blue color from the LD that emits the longer wavelength of the two types of LDs constituting the LD array 31. Instead of transmitting only light, an opening in a so-called “through” state may be used.

  In this case, the specific wavelength transmission filter 38p transmits the reflected light from the lens 37, that is, the blue light having two different wavelengths corresponding to the two types of LDs constituting the LD array 31. The amount detected by LS is proportional to the total amount of blue light emitted as the combined light of the LD array 31.

  FIG. 5 shows that the specific wavelength transmission filter 38 s of the color wheel 38 has a transmission characteristic of transmitting only blue light from the LD that emits the shorter wavelength of the two types of LDs constituting the LD array 31. When the specific wavelength transmission filter 38p has a transmission characteristic that transmits only the blue light from the LD emitting the longer wavelength, the two LDs of the LD array 31 corresponding to the amount of light received by the illuminance sensor LS The drive power (current) setting operation is shown.

  The processing in FIG. 5 is executed by the projection processing unit 13 and the CPU 18 that controls the projection processing unit 13. At the beginning of power-on, every elapse of a fixed time of the projection operation, for example, 1 [minute], or the light source unit 15. It is good also as what is performed at any time with the temperature detection of this light emitting element or cooling air.

  At the beginning of the processing, the CPU 18 uses the illuminance sensor LS at the timing when the specific wavelength transmission filter 38s that transmits only blue light having a shorter wavelength, as shown in FIG. 3C-1, is at a position corresponding to the illuminance sensor LS. The detected value P1 is measured and acquired (step S101).

  Thereafter, the CPU 18 detects at the illuminance sensor LS at a timing when the specific wavelength transmission filter 38p that transmits only blue light having a longer wavelength shown in FIG. 3C-2 is at a position corresponding to the illuminance sensor LS. The value P2 is measured and acquired (step S102).

  Based on the two values P1 and P2 thus obtained, a ratio thereof, for example, P1 / P2 is obtained, and the current LD array 31 is determined depending on whether or not the obtained ratio P1 / P2 is within a preset setting range. It is determined whether or not the balance of the output light amounts of the two types of LDs constituting the is maintained (step S103).

  Here, when it is determined that the obtained ratio P1 / P2 is within the set range prepared in advance and the balance of the output light amounts of the two types of LDs constituting the LD array 31 at the present time is maintained, The CPU 18 ends the setting process of FIG.

  Further, in the above step S103, the obtained ratio P1 / P2 is not within the set range prepared in advance, and the balance of the output light amounts of the two types of LDs constituting the LD array 31 at the present time is not maintained. When the determination is made, the CPU 18 determines which balance of the output light amounts of the two types of LDs depends on whether the calculated P1 / P2 is smaller than the representative value of the set range prepared in advance, for example, the intermediate value α of the range. It is determined whether it is shifted to the side (step S104).

  If the calculated P1 / P2 is smaller than the representative value α and the balance between the output light amounts of the two types of LDs is shifted to the longer wavelength blue light side, the CPU 18 is longer. After updating and setting the drive current of the LD on the side emitting blue light of the wavelength to the projection processing unit 13 so as to decrease by a preset small reduction width (step S105), the processing from step S101 is performed again. Returning, the processing from step S101 is executed again in the updated setting state.

  Further, when it is determined in step S104 that the obtained P1 / P2 is not smaller than the representative value α and the balance of the output light amounts of the two types of LDs is shifted to the shorter wavelength blue light side. Then, the CPU 18 updates and sets the drive current of the LD on the side emitting blue light having a shorter wavelength to the projection processing unit 13 so as to decrease by a preset slight reduction width (step S106), and then again Returning to the process from step S101, the process from step S101 is executed again in the updated setting state.

  In this manner, the calculated ratio P1 / P2 falls within the set range prepared in advance by repeatedly executing the update setting process of step S105 or step S106 in response to the balance of the output light quantity of the two types of LDs. At that time, it is determined in step S103, and the processing of FIG.

  As described above, when the power is turned on, every time a projection operation is performed, for example, every 1 minute, or when the temperature of the light emitting element of the light source unit 15 or the temperature of the cooling air is detected, the LD array 31 2 It is possible to maintain the balance of the amount of output light of different types of LDs.

  Accordingly, the CPU 18 adjusts the balance of the output light amount of the LD array 31 when the phosphor layer 38g of the color wheel 38 is in the optical path (when emitting light with green light) and the driving power of the LED 55 that emits red light. By doing so, it is possible to realize projection of a color image in which the overall color balance is achieved.

  3 and 4, the specific wavelength transmission filter 38p of the color wheel 38 emits only blue light from the LD that emits the longer wavelength of the two types of LDs constituting the LD array 31. It has been described that it may be in a so-called “through” state instead of being transmitted.

  In such a case, the setting operation of the driving power (current) for the two types of LDs of the LD array 31 corresponding to the amount of light received by the illuminance sensor LS instead of FIG. 5 will be described with reference to FIG.

  The processing in FIG. 6 is also executed by the projection processing unit 13 and the CPU 18 that controls the projection processing unit 13. At the beginning of power-on, every elapse of a certain time of projection operation, for example, 1 [minute], or the light source unit 15. It is good also as what is performed at any time with the temperature detection of this light emitting element or cooling air.

  At the beginning of the processing, the CPU 18 uses the illuminance sensor LS at the timing when the specific wavelength transmission filter 38s that transmits only blue light having a shorter wavelength, as shown in FIG. 3C-1, is at a position corresponding to the illuminance sensor LS. The detected value P1 is measured and acquired (step S301).

  After that, the CPU 18 measures and acquires the detection value P3 at the illuminance sensor LS at the timing when the transparent specific wavelength transmission filter 38p shown in FIG. 3C-2 is at a position corresponding to the illuminance sensor LS. (Step S302).

  In this case, since the acquired value P3 is in accordance with the light emission amounts of the two types of LDs constituting the LD array 31, the subtraction “P3-P1” is performed using the detection value P1 obtained in the immediately preceding step S301. The difference is calculated as the received light amount P2 from the LD emitting blue light having a longer wavelength (step S303).

  Based on the two values P1 and P2 thus obtained, a ratio thereof, for example, P1 / P2 is obtained, and the current LD array 31 is determined depending on whether or not the obtained ratio P1 / P2 is within a preset setting range. It is determined whether or not the balance of the output light amounts of the two types of LDs constituting the is maintained (step S304).

  Here, when it is determined that the obtained ratio P1 / P2 is within the set range prepared in advance and the balance of the output light amounts of the two types of LDs constituting the LD array 31 at the present time is maintained, The CPU 18 ends the setting process of FIG.

  In step S304, the ratio P1 / P2 obtained is not within the set range prepared in advance, and the balance of the output light amounts of the two types of LDs constituting the LD array 31 at the present time is not maintained. When the determination is made, the CPU 18 determines which balance of the output light amounts of the two types of LDs depends on whether the calculated P1 / P2 is smaller than the representative value of the set range prepared in advance, for example, the intermediate value α of the range. It is determined whether it is shifted to the side (step S305).

  If the calculated P1 / P2 is smaller than the representative value α and the balance between the output light amounts of the two types of LDs is shifted to the longer wavelength blue light side, the CPU 18 is longer. After updating and setting the drive current of the LD on the side emitting blue light of the wavelength to the projection processing unit 13 so as to decrease by a preset slight reduction width (step S306), the processing from step S301 is performed again. Returning, the processing from step S301 is executed again in the updated setting state.

  Further, when it is determined in step S305 that the obtained P1 / P2 is not smaller than the representative value α, and the balance of the output light amounts of the two types of LDs is shifted to the shorter wavelength blue light side. The CPU 18 updates and sets the drive current of the LD on the side emitting blue light having a shorter wavelength to the projection processing unit 13 so as to decrease by a preset slight reduction width (step S307), and then again Returning to the process from step S301, the process from step S301 is executed again in the updated setting state.

  In this manner, the calculated ratio P1 / P2 falls within the setting range prepared in advance by repeatedly executing the update setting process of step S306 or step S306 in response to the balance of the output light amount of the two types of LDs. At that time, it is determined in step S304, and the processing of FIG.

  As described above, when the power is turned on, every time a projection operation is performed, for example, every 1 minute, or when the temperature of the light emitting element of the light source unit 15 or the temperature of the cooling air is detected, the LD array 31 2 It is possible to maintain the balance of the amount of output light of different types of LDs.

  Accordingly, the CPU 18 adjusts the balance of the output light amount of the LD array 31 when the phosphor layer 38g of the color wheel 38 is in the optical path (when emitting light with green light) and the driving power of the LED 55 that emits red light. By doing so, it is possible to realize projection of a color image in which the overall color balance is achieved.

  In the above embodiment, the specific wavelength transmission filter 38p of the color wheel 38 is described as the opening in the “through” state. However, the specific wavelength transmission filter 38s of the color wheel 38 is opened in the “through” state. It is good as a part.

  As described above in detail, according to the present embodiment, an accurate control method can be obtained for each type of LD based on the combined light from the LD array 31 having a plurality of types of LDs having different emission wavelengths.

  Further, in the above embodiment, the phosphor layer 38g for obtaining green light having different wavelengths and the diffusing plate 38b for transmission are provided on the rotating surface for condensing blue light of two types of wavelengths of the LD array 31. In addition, since the specific wavelength transmission filters 38p and 38s are provided at positions on the rotation surface corresponding to the transmission diffusion plate 38b with respect to the color wheel 38, the transmission diffusion plate 38b and the specific wavelength transmission filters 38p and 38s are provided. Can be reliably synchronized with each other, and it is not necessary to separately install a mechanism provided with the specific wavelength transmission filters 38p and 38s, and the apparatus can be downsized.

  Furthermore, in the above-described embodiment, as shown in FIG. 3 or FIG. 4, only a small part of the reflection is generated by the lens 50 or the lens 37 that is disposed in proximity to the light transmitted through the transmission diffusion plate 38 b of the color wheel 38. Since the amount of light received is measured by the illuminance sensor LS using light, the reflected light that is wastedly emitted by the lens optical system is effectively used, and it is not necessary to use the light used in the original projection, and the efficiency It becomes the target.

  In addition, since the illuminance sensor LS is arranged at a position deviated from the optical axis used for the original projection, the measurement can be efficiently performed without reducing the light used for the original projection. .

  In this respect, as shown in FIG. 4 above, the illuminance sensor LS is disposed on the opposite side of the LD array 31 with the rotation surface of the color wheel 38 interposed therebetween, whereby the light transmitted through the transmission diffusion plate 38b or 38s. Can be measured reliably.

  On the other hand, in FIG. 2 and FIG. 3, the illuminance sensor LS is arranged on the same side as the LD array 31 with respect to the rotation surface of the color wheel 38. In addition, it is not necessary to arrange the illuminance sensor LS on the side where further downsizing is required, and since the spatial freedom regarding the arrangement of the illuminance sensor LS is high, a position with higher light receiving efficiency can be selected.

  In the above embodiment, as described with reference to FIG. 5 or FIG. 6, the combination ratio of blue light of two wavelengths is compared with a preset threshold range, and control is performed from the comparison result. Therefore, the burden on the CPU 18 and the projection processing unit 13 can be reduced, and simpler control can be realized.

  In addition, since the present embodiment is intended to control the LD as a laser element that emits light of a wavelength belonging to the blue band in particular, in consideration of temperature drift and the like in the laser element aligned with the wavelength and phase, Very precise control of the emission color can be easily realized.

  In addition, although the said embodiment demonstrated the structural example in case of using LD array 31 which emits blue light, and LED55 which emits red light as a light emitting element, the light emitting element which emits blue light, the light emitting element which emits green light, Even if the light emitting elements emitting red light are provided separately, a spectroscopic means such as a specific wavelength transmission filter 38p and a specific wavelength transmission filter 38s is provided for each light emitting element as necessary. If it is, it can be similarly applied.

  In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the functions executed in the above-described embodiments may be combined as appropriate as possible. The above-described embodiment includes various stages, and various inventions can be extracted by an appropriate combination of a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, if the effect is obtained, a configuration from which the constituent requirements are deleted can be extracted as an invention.

Hereinafter, the invention described in the scope of claims of the present application will be appended.
According to a first aspect of the present invention, there is provided a first light emitting element that emits light having a first wavelength, a second light emitting element that emits light having a second wavelength different from the first wavelength, and the first light emitting element. A condensing unit that emits the light emitted from the light emitting element and the second light emitting element together in the same light beam, and a light that transmits only the light having the first wavelength with respect to the light emitted from the condensing unit. A light separating means in which a first transmissive region and a second transmissive region that transmits light including light of the second wavelength are disposed; the illuminance of the light transmitted through the first transmissive region; Illuminance measuring means for measuring the illuminance of the light transmitted through the two transmissive regions, light emitted from the first light emitting element and light emitted from the second light emitting element based on the measurement result of the illuminance measuring means Calculating means for calculating a composite ratio of the first light-emitting element and Characterized by comprising a driving control means for controlling the power to drive the serial second light emitting element.

  According to a second aspect of the present invention, in the first aspect of the invention, the first transmission region is a filter that transmits only the light having the first wavelength, and the second transmission region is the second transmission region. It is a filter that transmits only light of a wavelength.

  According to a third aspect of the present invention, in the first aspect of the present invention, the second transmission region is an opening.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the light separating means irradiates light emitted from the light collecting means and converts the light into a light having a different wavelength by the fluorescent substance. And a rotating body that includes a rotating body that is provided by dividing a transmission surface that transmits light emitted from the light collecting means into a rotating surface, and a rotating mechanism that rotationally drives the rotating body. And

  According to a fifth aspect of the present invention, the optical system according to the fourth aspect further includes a lens that transmits light transmitted through the transmission part of the rotating body, and the light separating means is close to the transmission part of the rotating body. The first transmission region and the second transmission region are arranged in parallel on the rotated surface, and a part of the reflected light that is transmitted through the transmission part of the rotating body and is incident on the lens and reflected is reflected in the first rotation region. The light is incident on the transmissive region and the second transmissive region.

  According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the illuminance measuring means is arranged at a position deviating from an optical path emitted from the light collecting means.

  The invention according to claim 7 is the invention according to any one of claims 4 to 6, characterized in that the illuminance measuring means is arranged on the opposite side of the light condensing means across the rotating surface of the rotating body. To do.

  The invention according to claim 8 is the invention according to any one of claims 4 to 6, characterized in that the illuminance measuring means is arranged on the same side as the condensing means with respect to the rotating surface of the rotating body. To do.

  According to a ninth aspect of the present invention, in the invention according to any one of the first to eighth aspects, the drive control means compares the composite ratio obtained by the calculation means with a preset threshold value, thereby comparing the comparison result. The power for driving the first light emitting element and the second light emitting element is controlled.

  A tenth aspect of the present invention is the laser element according to any one of the first to ninth aspects, wherein each of the first light emitting element and the second light emitting element emits light having a wavelength belonging to a blue band. It is characterized by being.

  The invention according to claim 11 is a first light emitting element that emits light of a first wavelength, a second light emitting element that emits light of a second wavelength different from the first wavelength, and the first light emission. A condensing means for emitting the light emitted from the light emitting element and the second light emitting element together in the same luminous flux, and a first light transmitting only the light having the first wavelength with respect to the light emitted from the condensing means. A light separating means in which a transmissive region and a second transmissive region that transmits only light of the second wavelength are disposed; illuminance of light transmitted through the first transmissive region; and transmitted through the second transmissive region Illuminance measuring means for measuring the illuminance of light, and calculating means for calculating a combined ratio of light emitted from the first light emitting element and light emitted from the second light emitting element based on a measurement result by the illuminance measuring means. , And the combination ratio obtained by the calculation means, the first light emitting element and the second light emitting element. An optical image using light from the light source unit based on a light source unit having a drive control unit for controlling power for driving the element, an image input unit for inputting an image signal, and an image signal input by the image input unit And a projection unit that emits a light image formed by the display unit toward a projection target.

  The invention according to claim 12 is a first light emitting element that emits light of a first wavelength, a second light emitting element that emits light of a second wavelength different from the first wavelength, and the first light emission. A light source control method in a device including a condensing unit that collects and emits each emitted light of the element and the second light emitting element in the same luminous flux, wherein the first light is emitted from the condensing unit. The illuminance of light transmitted through the first transmission region using a first transmission region that transmits only light of the second wavelength and a second transmission region that transmits light including the light of the second wavelength And an illuminance measuring step for measuring the illuminance of the light transmitted through the second transmission region, light emitted from the first light emitting element based on the measurement result in the illuminance measuring step, and the second light emitting element. The calculation step of calculating the combined ratio of the emitted light and the first ratio by the combination ratio obtained in the calculation step. Characterized in that a drive control step of controlling the light emitting element and the power for driving the second light-emitting element.

  DESCRIPTION OF SYMBOLS 10 ... Projector apparatus, 11 ... Input part, 12 ... Image conversion part, 13 ... Projection process part, 14 ... Micromirror element, 15 ... Light source part, 16 ... Mirror, 17 ... Projection lens part, 18 ... CPU, 19 ... Main Memory, 20 ... Program memory, 21 ... Operating unit, 22 ... Audio processing unit, 23 ... Speaker unit, 31 ... LD array, 32 ... Mirror array, 33,34 ... Lens, 35 ... Dichroic mirror, 36,37 ... Lens, 38 ... Color wheel, 38b ... Diffusion plate for transmission, 38g ... Phosphor layer, 38p, 38s ... Specific wavelength transmission filter, 39 ... Motor (M), 41 ... Lens, 42 ... Dichroic mirror, 43 ... Lens, 44 ... Integrator , 45 ... lens, 46 ... mirror, 47, 48 ... lens, 50 ... lens, 51 ... mirror, 52 ... lens, 53 ... mirror, 5 ... lens, 55 ... LED, 56, 57 ... lens, LS ... illuminance sensor, SB ... system bus.

Claims (12)

A first light emitting element that emits light of a first wavelength;
A second light emitting element that emits light of a second wavelength different from the first wavelength;
Condensing means for emitting the light emitted from the first light emitting element and the second light emitting element together in the same luminous flux;
A first transmission region that transmits only the light having the first wavelength with respect to the light emitted from the light collecting means; and a second transmission region that transmits the light including the light having the second wavelength. A light separating means disposed,
Illuminance measuring means for measuring the illuminance of light transmitted through the first transmission region and the illuminance of light transmitted through the second transmission region;
Calculating means for calculating a combined ratio of light emitted from the first light emitting element and light emitted from the second light emitting element based on the measurement result of the illuminance measuring means;
A light source device comprising: drive control means for controlling electric power for driving the first light emitting element and the second light emitting element according to a composite ratio obtained by the calculating means.   The first transmission region is a filter that transmits only light of the first wavelength, and the second transmission region is a filter that transmits only light of the second wavelength. 1. The light source device according to 1.   The light source device according to claim 1, wherein the second transmission region is an opening.   The light separating means divides a phosphor part that irradiates light emitted from the condensing means into light having a different wavelength by the phosphor and a transmission part that transmits light emitted from the condensing means into a rotating surface. 4. The light source device according to claim 1, wherein the light source device is disposed in a rotating body portion including a rotating body provided in a rotating manner and a rotating mechanism that rotationally drives the rotating body. A lens that transmits the light transmitted through the transmission part of the rotating body;
The light separation means arranges the first transmission region and the second transmission region in parallel on a rotation surface close to the transmission part of the rotating body,
5. The light source according to claim 4, wherein a part of the reflected light which is transmitted through the transmission part of the rotating body and is incident on the lens and reflected is incident on the first transmission region and the second transmission region. apparatus.   6. The light source device according to claim 1, wherein the illuminance measuring means is arranged at a position deviated from an optical path emitted from the light collecting means.   The light source device according to any one of claims 4 to 6, wherein the illuminance measuring means is arranged on the opposite side of the light condensing means across the rotating surface of the rotating body.   The light source device according to claim 4, wherein the illuminance measuring unit is arranged on the same side as the light collecting unit with respect to a rotating surface of the rotating body.   The drive control means controls the power for driving the first light emitting element and the second light emitting element from the comparison result by comparing the composite ratio obtained by the calculating means with a preset threshold value. The light source device according to claim 1, wherein the light source device is a light source device.   10. The light source device according to claim 1, wherein each of the first light emitting element and the second light emitting element is a laser element that emits light having a wavelength belonging to a blue band. A first light emitting element that emits light having a first wavelength, a second light emitting element that emits light having a second wavelength different from the first wavelength, the first light emitting element, and the second light emitting element. Condensing means for collectively emitting each emitted light in the same luminous flux, a first transmission region that transmits only the light of the first wavelength and the second wavelength with respect to the light emitted from the condensing means Light separating means having a second transmissive region that transmits only the light of the first transmissive region, illuminance measurement for measuring the illuminance of the light transmitted through the first transmissive region and the illuminance of the light transmitted through the second transmissive region Obtained by the calculation means for calculating the combined ratio of the light emitted from the first light emitting element and the light emitted from the second light emitting element based on the measurement result of the illuminance measuring means, and the calculation means The power for driving the first light-emitting element and the second light-emitting element is controlled by the combination ratio. A light source unit having a drive control means for,
An image input means for inputting an image signal;
Display means for forming a light image using light from the light source unit based on an image signal input by the image input means;
A projection apparatus comprising: a projection unit that emits a light image formed by the display unit toward a projection target. A first light emitting element that emits light having a first wavelength, a second light emitting element that emits light having a second wavelength different from the first wavelength, the first light emitting element, and the second light emitting element. A light source control method in an apparatus provided with a condensing unit that collects and emits each emitted light into the same luminous flux,
A first transmission region that transmits only the light having the first wavelength with respect to the light emitted from the light collecting means; and a second transmission region that transmits the light including the light having the second wavelength. Illuminance measurement step of measuring the illuminance of light transmitted through the first transmission region and the illuminance of light transmitted through the second transmission region, and
A calculation step of calculating a combined ratio of light emitted from the first light emitting element and light emitted from the second light emitting element based on the measurement result in the illuminance measurement step;
A light source control method comprising: a drive control step of controlling electric power for driving the first light emitting element and the second light emitting element based on a composite ratio obtained in the calculating step.

Images