US 12,461,435 B2
Projection type display device
Shinji Kikuma, Yokohama (JP); Tadashi Furukawa, Yokohama (JP); Yasuki Arihara, Yokohama (JP); and Takatsugu Aizaki, Yokohama (JP)
Assigned to JVCKENWOOD CORPORATION, Yokohama (JP)
Filed by JVCKENWOOD Corporation, Yokohama (JP)
Filed on Apr. 25, 2023, as Appl. No. 18/138,792.
Claims priority of application No. 2022-080125 (JP), filed on May 16, 2022.
Prior Publication US 2023/0367190 A1, Nov. 16, 2023
Int. Cl. G03B 21/20 (2006.01); G03B 21/14 (2006.01)
CPC G03B 21/204 (2013.01) [G03B 21/142 (2013.01); G03B 21/2053 (2013.01); G03B 21/208 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A projection type display device comprising:
a fluorescent substance that is irradiated with laser light and is configured to emit illumination light of a prescribed color;
a condenser lens that is positioned at a location immediately after the fluorescent substance on a side in which the illumination light is emitted from the fluorescent substance, and is configured to collect the illumination light;
a moving mechanism configured to move the fluorescent substance in a direction toward the condenser lens and in a direction away from the condenser lens;
an image display element configured to generate image light by modulating the illumination light according to an image;
a light quantity adjustment mechanism configured to adjust a quantity of the image light by changing a size of an opening through which the illumination light or the image light passes in order to adjust a contrast of a projected image; and
a controller configured to control the moving mechanism such that a distance between the fluorescent substance and the condenser lens is a distance associated with an F-number corresponding to an adjustment state of the quantity of the image light implemented by means of the light quantity adjustment mechanism.