Light source unit including luminescent wheel and color wheel, and projector

Patent metadata

Field	Value
Publication number	US-9843780-B2
Application number	US-201615063231-A
Country	US
Kind code	B2
Filing date	Mar 7, 2016
Priority date	Jun 5, 2015
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

A projector includes alight source unit including a light source, a luminescent wheel having light source segments receiving light from the light source to emit different wavelength ranges of light, a color wheel separate from the luminescent wheel that has a first transmission area transmitting light, in visible light, existing in a certain range of wavelengths and a second transmission area transmitting light existing in a range of wavelengths broader than that of the light transmitted through the first transmission area and on to which the different wavelength ranges of light from the luminescent wheel are shone, and a control module controlling not only the luminescent wheel and the color wheel so that they are synchronized with each other but also the light source so that the light emitted from the light source is sequentially shone on to the light source segments.

First claim

What is claimed is:

1. A light source unit comprising:
a light source;
a luminescent wheel comprising a plurality of segments that receive light emitted from the light source to emit different wavelength ranges of light;
a color wheel separate from the luminescent wheel and onto which the different wavelength ranges of light from the luminescent wheel are shone, the color wheel comprising (i) a first transmission area that transmits light, in visible light, that exists in a certain range of wavelengths, and (ii) a second transmission area that transmits light that exists in a range of wavelengths that is broader than the range of wavelengths of the light that is transmissible through the first transmission area; and
a control module configured to control the luminescent wheel and the color wheel so that the luminescent wheel and the color wheel are synchronized with each other, and to control the light source so that the light emitted from the light source is sequentially shone onto the plurality of light source segments,
wherein the light source segments of the luminescent wheel comprise a first light source segment, a second light source segment, and a third light source segment that emit light in a first range of wavelengths, light in a second range of wavelengths, and light in a third range of wavelengths, respectively,
wherein the light in the second range of wavelengths includes a wavelength range of the light in the first range of wavelengths and a wavelength range of the light in the third range of wavelengths, and
wherein the control module has (i) a first projection mode in which the light in the second range of wavelengths that is emitted from the second light source segment is caused to be incident on the second transmission area and (ii) a second projection mode in which the light in the second range of wavelengths that is emitted from the second light source segment is caused to be incident on the first transmission area.

2. The light source unit according to claim 1 , wherein the light source segments of the luminescent wheel emit:
(i) light in a range of red wavelengths,
(ii) light in a range of green wavelengths,
(iii) light in a range of blue wavelengths, and
(iv) light in a range of cyan wavelengths or light in a range of magenta wavelengths or light in a range of yellow wavelengths.

3. The light source unit according to claim 1 , wherein the light source segments of the luminescent wheel further comprise a fourth light source segment that emits light in a fourth range of wavelengths.

4. The light source unit according to claim 3 , wherein the first transmission area transmits the light in the first range of wavelengths and the light in the fourth range of wavelengths and interrupts transmission of the light in the third range of wavelengths,
wherein in the first projection mode, the light in the first range of wavelengths and the light in the fourth range of wavelengths are caused to be incident on the first transmission area and the light in the second range of wavelengths and the light in the third range of wavelengths are caused to be incident on the second transmission area, and
wherein in the second projection mode, the light in the first range of wavelengths and the light in the second range of wavelengths are caused to be incident on the first transmission area and the light in the third range of wavelengths and the light in the fourth range of wavelengths are caused to be incident on the second transmission area.

5. The light source unit according to claim 3 , wherein the first transmission area transmits the light in the third range of wavelengths and the light in the fourth range of wavelengths and interrupts transmission of the light in the first range of wavelengths,
wherein in the first projection mode, the light in the first range of wavelengths and the light in the second range of wavelengths are caused to be incident on the second transmission area and the light in the third range of wavelengths and the light in the fourth range of wavelengths are caused to be incident on the first transmission area, and
wherein in the second projection mode, the light in the first range of wavelengths and the light in the fourth range of wavelengths are caused to be incident on the second transmission area and the light in the second range of wavelengths and the light in the third range of wavelengths are caused to be incident on the first transmission area.

6. The light source unit according to claim 3 , wherein the light in the first range of wavelengths, the light in the second range of wavelengths, the light in the third range of wavelengths, and the light in the fourth range of wavelengths are light in a range of green wavelengths, light in a range of yellow wavelengths, light in a range of red wavelengths, and light in a range of blue wavelengths, respectively.

7. The light source unit according to claim 3 , wherein the first light source segment, the second light source segment and the third light source segment are a luminous light emitting area that receives light emitted from the light source as excitation light to emit luminous light, and
wherein the fourth light source segment is a diffuse transmission area that transmits light emitted from the light source to emit the light as the light in the fourth range of wavelengths.

8. The light source unit according to claim 3 , wherein in the second projection mode, in some of the light in the first range of wavelengths, the light in the second range of wavelengths, and the light in the third range of wavelengths, the lights that are caused to be incident on the first transmission area are controlled individually or collectively as regarding that there exists one output period in relation to emitting time.

9. The light source unit according to claim 3 , wherein in the second projection mode, in some of the light in the first range of wavelengths, the light in the second range of wavelengths, and the light in the third range of wavelengths, the lights that are caused to be incident on the first transmission area are kept emitted in a color mixing period when a wavelength range of the incident light is switched over.

10. A projector comprising:
the light source unit according to claim 1 ;
a display device configured to generate image light;
a projection-side optical system configured to project image light emitted from the display device onto a screen; and
a projector control unit configured to control the light source unit and the display device.

Assignees

• Casio Computer Co Ltd

Inventors

• Ogawa Masahiro

Classifications

• G02B26/008 Primary

  in the form of devices for effecting sequential colour changes, e.g. colour wheels · CPC title

• H04N9/3114

  by using a sequential colour filter producing one colour at a time · CPC title

• G02B5/0278

  used in transmission · CPC title

• G03B21/2053

  Intensity control of illuminating light (controlled by video signal processing H04N5/74 or H04N9/31) · CPC title

• G03B21/204 Primary

  using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197) · CPC title