Illumination light source device including a reflecting-transmitting element, projection device including the illumination light source device and method to control the projection device

Abstract

An illumination light source device includes a reflection-transmission wheel provided on a light-path from an excitation light source and having a transmission region that transmits an excitation light and a reflection region reflecting the excitation light, a fluorescent wheel provided on at least one of the reflection light-path and the transmission light-path and having a fluorescent body emitting fluorescence when excited by the excitation light, and a control section turning-on the excitation light source while the boundary of the transmission region and the reflection region traverses the light-path, in order to provide an illumination light source device capable of preventing a deterioration of the fluorescent body, whereby improving a color reproducibility by use of the color mixture occurred at the boundary region between the transmission light-path and the reflection light-path effectively and improving the brightness of image.

1 . (canceled) 
     
     
         2 . An illumination light source device comprising:
 a reflection-transmission member provided on an exit light path of an excitation light from an excitation light source and having a transmission region transmits an excitation light as an optical wavelength and a reflection region reflecting the excitation light from the excitation light source, in which the transmission region and the reflection region sequentially traverses the exit light path of the excitation light from the excitation light source;   a fluorescent body member provided on at least one of the reflection light path formed of the reflection region and the transmission light path formed of the transmission region and having a fluorescent body emitting fluorescence when excited by the excitation light; and   a control section turning-on the excitation light source and leading the excitation light to both the reflection light path and the transmission light path at one time while both the boundary of the transmission region and the reflection region of the reflection-transmission wheel traverses the light path of the excitation light at one time.   
     
     
         3 . The illumination light source device according to  claim 2 , further comprising:
 a first drive part driving the reflection-transmission member so that the transmission region and the reflection region traverse the light path from the excitation light source;   a second drive part driving the fluorescent member; and   a position detector for boundary region detecting the boundary region of the reflection-transmission member.   
     
     
         4 . The illumination light source device according to  claim 3 , further comprising:
 a light path junction element forming a converged light path by converging the transmission light path and the reflection light path, and converging a light flux led through the transmission light path and a light flux led through the reflection light path, and emitting converged light flux from the illumination optical system.   
     
     
         5 . The illumination light source device according to  claim 4 , further comprising:
 an illumination light source emitting illumination light of a different color from the excitation light and the fluorescence to the converged light path.   
     
     
         6 . The illumination light source device according to  claim 5 , wherein:
 the reflection-transmission member includes the reflection-transmission wheel, the fluorescent body member includes the fluorescent wheel, the position detector for boundary region includes the rotational angle position detector detecting the rotational angle position of the reflection-transmission member, the first drive member includes the drive part rotary driving the reflection-transmission wheel, the second drive member includes the drive part rotary driving the fluorescent wheel, and the illumination optical system includes a first illumination optical system comprising at least the excitation light source, the reflection-transmission wheel, the light path junction element, and the fluorescent wheel, and a second illumination optical system comprising the light source.   
     
     
         7 . A projection device comprising:
 the illumination light source device according to  claim 2 ,   the illumination optical system leading the illumination light emitted by the light path junction element of the illumination light source device, and the projection optical system projecting the images generated by the image generator,   wherein the control section generates the images corresponding to the image data by use of the persistence of vision, by dividing a time frame of image data, and controlling on/off of the excitation light source corresponding to the image data and controlling the image generator.   
     
     
         8 . The projection device according to  claim 7 , wherein:
 the light which have a color mixture of the color of the excitation light source and the color of the illumination light source by the principle of the additive color system by turning on the excitation light source and the illumination light source in one time frame of the image data is generated.   
     
     
         9 . A method for control an illumination light source device including
 an excitation light source forming a part of an illumination optical system and emitting an emission light as an optical wavelength;   a reflection-transmission member forming a part of an illumination optical system, being provided on a light path of an excitation light source, and having a transmission region transmitting the excitation light from the excitation light source and a reflection region reflecting the excitation light from the excitation light source;   a fluorescent body member forming a part of the illumination optical system, being provided on at least one of a reflection light path of the excitation light reflected by the reflection region and a transmission light path of the excitation light transmitted the transmission region, and having the fluorescent body emitting a fluorescence of a different color from the excitation light when excited by the excitation light;   a first drive part member driving the reflection-transmission member so that the transmission region and the reflection region periodically traverse the light path of the excitation light;   a second drive part member driving the fluorescent body member;   a rotational angle position detector detecting a rotational angle position of the reflection-transmission member;   a control section controlling the drive of the first drive part member and the second drive part member and lighting-up of the excitation light source by use of a detection result of the rotational angle position detector while a boundary of the transmission region and the reflection region of the reflection-transmission member is traverse the light path; and   a light path junction element forming the converged light path by converging the transmission light path and the reflection light path,   the method comprising:   converging a light flux led to the light path junction element via the transmission light path and a light flux led to the light path junction element via the reflection light path and emitting by the illumination optical system;   detecting the rotational angle position of a reflection-transmission wheel as the reflection-transmission member; and   controlling turning-on the excitation light source and leading the excitation light to both the reflection light path and the transmission light path at one time when both the boundary region of the reflection region and the transmission region is traverse by calculating the timing that the reflection-transmission wheel traverse the light path of the light source at one time by use of the detected result obtained by detecting.