Abstract: A photoelectric conversion apparatus comprises an optical system and a plurality of pixels, each pixel provided with a photoelectric conversion unit configured to generate pulses in response to photons, a counter configured to count the number of the pulses, and a memory configured to store a count value of the counter, wherein the apparatus generates a signal based on the difference between the count value of the counter at the start time and end time of an accumulation period in the photoelectric conversion unit, includes at least a first accumulation period and a second accumulation period within one full frame period, the first accumulation period being shorter than the second accumulation period, and controls the signal generated during the first accumulation period to be output during the period from the end of the first accumulation period to the end of the second accumulation period.

Abstract: In a photoelectric conversion device, pixels each including a photoelectric conversion unit configured to emit pulses in response to photons, a counter configured to count the number of the pulses, and a memory configured to store a count value of the counter, an optical system configured to form an object image having different resolutions in a first pixel region and a second pixel region of a sensor unit, a signal is generated based on a difference between count values of the counter, control is performed such that a signal generated in a first accumulation period is output between the end of the first accumulation period and the end of a second accumulation period, and control is performed such that an accumulation period of the first pixel region and an accumulation period of the second pixel region is set to the first accumulation period and the second accumulation period.

Abstract: A signal is generated based on a difference between count values for a counter between a start time and an end time of an accumulation period in a photoelectric conversion unit; control is performed such that a signal that is generated during a first accumulation period that is shorter than a second accumulation period is output during a time from an end of the first accumulation period until an end of the second accumulation period wherein one full frame period includes the first accumulation period and the second accumulation period that is longer than the first accumulation period; it is made possible to set, in a sensor unit consisting of the plurality of pixels, a first pixel region having at least the first accumulation period and the second accumulation period, and a second pixel region having at least the second accumulation period; and the first pixel region and the second pixel region are set based on at least one type of information from among characteristic information relating to characteristi

Abstract: A light source apparatus includes light sources emitting first and second polarized light, an optical element transmitting one of the polarized light and reflecting the other, a polarization rotator generating polarization rotated light from the first polarized light, a wavelength convertor converting the second polarized light into wavelength converted light, and a controller. The optical element generates emitted light by combining the wavelength converted light and polarization rotated light. The controller acquires respective deterioration amounts of the light sources, and controls, based on respective changes in light emission amounts from the light sources acquired from the deterioration amounts, the light emission amount from at least one of the light sources for making different respective change amounts of the light emission amounts from the light sources, or changing a ratio between respective light emission amounts from the light sources.

Abstract: A light source apparatus includes a first solid light source, a second solid light source configured to emit light with a wavelength different from that from the first solid light source, and a controller configured to control turning on of the first and second solid light sources. The controller turns on the second solid light source while maintaining turning on the first solid light source after turning on the first solid light source.

Abstract: A wavelength conversion element made of a sintered body includes a fluorescent member, a light-transmitting member having a thermal conductivity higher than that of the fluorescent member, and a light-scattering member having a refractive index higher than that of the light-transmitting member, and an average particle radius of 75 nm or more and 200 nm or less.

Abstract: A wavelength conversion element includes a wavelength conversion layer configured to convert light having a first wavelength into light having a second wavelength, and a flattening layer formed on at least one surface of the wavelength conversion layer. The flattening layer has a surface roughness smaller than that of the wavelength conversion layer. The wavelength conversion layer is made of a sintered body obtained by sintering a phosphor material and a ceramic material.

Abstract: A light source apparatus includes light sources emitting first and second polarized light, an optical element transmitting one of the polarized light and reflecting the other, a polarization rotator generating polarization rotated light from the first polarized light, a wavelength convertor converting the second polarized light into wavelength converted light, and a controller. The optical element generates emitted light by combining the wavelength converted light and polarization rotated light. The controller acquires respective deterioration amounts of the light sources, and controls, based on respective changes in light emission amounts from the light sources acquired from the deterioration amounts, the light emission amount from at least one of the light sources for making different respective change amounts of the light emission amounts from the light sources, or changing a ratio between respective light emission amounts from the light sources.

Abstract: A light source apparatus includes a red LD array that emits light in a red bandwidth, a blue LD array that emits light in a blue bandwidth, and a light combining part that includes a transmissive region and a reflecting region, the transmissive region transmitting the light emitted from the red LD array therethrough, the reflecting region reflecting the light emitted from the blue LD array.

Abstract: A light source apparatus includes a light source unit configured to emit light of a first wavelength, a first fluorescent element and a second fluorescent element each configured to convert at least part of the light of the first wavelength into light of a second wavelength that is different from the first wavelength, and a light amount adjustment unit configured to adjust an amount of light emitted to each of the first fluorescent element and the second fluorescent element. The first fluorescent element converts the light of the first wavelength into the light of the second wavelength at a first ratio. The second fluorescent element converts the light of the first wavelength into the light of the second wavelength at a second ratio that is different from the first ratio.

Abstract: An image projection apparatus includes a light source unit including a plurality of laser light sources, a light modulation element configured to modulate illumination light generated using a laser beam from the light source unit and to generate image light projected onto a projection surface, and a controller configured to control driving of the plurality of laser light sources. The controller controls a luminance of the illumination light by selecting a first laser light source that emits the laser beam and a second laser light source that does not emit the laser beam among the plurality of laser light sources.

Abstract: A light source apparatus includes a first light source configured to emit light in a first wavelength band, a second light source configured to emit light in a second wavelength band different from the first wavelength band, a light amount ratio changer configured to change a light amount ratio between a first polarized light component and a second polarized light component in light of the first wavelength band, a polarization beam splitter configured to split the first polarized light component and the second polarized light component, a wavelength converter configured to convert the light of the first wavelength band obtained from the first polarized light component, into light in a third wavelength band including the second wavelength band, and a light combiner configured to combine light in the first wavelength band and light in the second wavelength band with each other.

Abstract: The wavelength conversion element converts a wavelength of part of an exciting light to generate a fluorescent light and thereby generate a combined light in which the fluorescent light is combined with a non-converted light whose wavelength is the same as that of the exciting light. The element includes a fluorescent body, a binder contacting the fluorescent body, and multiple diffuser particles included in the binder. A minimum particle diameter of the multiple diffuser particles is ¼ or more and 4 times or less of a wavelength of the fluorescent light, and a ratio of a volume of the multiple diffuser particles to a total volume of the binder and multiple diffuser particles is 25% or more and 50% or less.

Abstract: A light source apparatus includes a red LD array that emits light in a red bandwidth, a blue LD array that emits light in a blue bandwidth, and a light combining part that includes a transmissive region and a reflecting region, the transmissive region transmitting the light emitted from the red LD array therethrough, the reflecting region reflecting the light emitted from the blue LD array.

Abstract: An image projection apparatus includes a light source unit including a plurality of laser light sources, a light modulation element configured to modulate illumination light generated using a laser beam from the light source unit and to generate image light projected onto a projection surface, and a controller configured to control driving of the plurality of laser light sources. The controller controls a luminance of the illumination light by selecting a first laser light source that emits the laser beam and a second laser light source that does not emit the laser beam among the plurality of laser light sources.

Abstract: A light source apparatus includes a first solid light source, a second solid light source configured to emit light with a wavelength different from that from the first solid light source, and a controller configured to control turning on of the first and second solid light sources. The controller turns on the second solid light source while maintaining turning on the first solid light source after turning on the first solid light source.

Abstract: An image projection apparatus includes a first light source configured to emit first light with a first wavelength band, a wavelength conversion element configured to convert part of the first light into wavelength-converted light with a wavelength band different from the first wavelength band and containing a second wavelength band, a second light source configured to emit second light with a wavelength band contained in the second wavelength band, a first measurement unit configured to measure a light quantity in a first measurement wavelength band as at least part of the second wavelength band, and an acquisition unit configured to acquire information on a light quantity of the first light and a light quantity of the second light by using a measurement result by the first measurement unit.

Abstract: An image projection apparatus includes a first light source configured to emit first light with a first wavelength band, a wavelength conversion element configured to convert part of the first light into wavelength-converted light with a wavelength band different from the first wavelength band and containing a second wavelength band, a second light source configured to emit second light with a wavelength band contained in the second wavelength band, a first measurement unit configured to measure a light quantity in a first measurement wavelength band as at least part of the second wavelength band, and an acquisition unit configured to acquire information on a light quantity of the first light and a light quantity of the second light by using a measurement result by the first measurement unit.

Abstract: An image display apparatus including a light source; a light source control unit configured to control electric power to be supplied to the light source; a light source cooling unit configured to cool the light source; a cooling control unit configured to control the light source cooling unit; an image display device; an illumination optical system configured to introduce light from the light source to the image display device, and a projecting optical system configured to project light modulated by the image display device. When the light source control unit receives a turn-off command, the light source control unit first lowers electric power to be supplied to the light source to a predetermined electric power lower than normal electric power to be supplied when the lamp is on, and then blocks the supply of the electric power to the light source, thereby turning the light source off.

Abstract: The wavelength conversion element converts a wavelength of part of an exciting light to generate a fluorescent light and thereby generate a combined light in which the fluorescent light is combined with a non-converted light whose wavelength is the same as that of the exciting light. The element includes a fluorescent body, a binder contacting the fluorescent body, and multiple diffuser particles included in the binder. A minimum particle diameter of the multiple diffuser particles is ¼ or more and 4 times or less of a wavelength of the fluorescent light, and a ratio of a volume of the multiple diffuser particles to a total volume of the binder and multiple diffuser particles is 25% or more and 50% or less.