Optical assembly containing a) at least two pairs of dichroic beamsplitting elements grouped together such that first sides of these elements are parallel and immediately adjacent to one another and to a predetermined line, and b) two optical lenses disposed such that light transmitted through the lenses towards the beamsplitting element passes through the elements without being scattered at the first sides. Optionally, a first dichroic beamsplitting element in a first pair and a first dichroic element in a second pair have equal optical properties. Imaging probefor example, a laparoscopeemploying such optical assembly.

A projection image display device of the present disclosure includes a light source, an image forming element that forms an image, a color separating and combining unit that separates first illumination light and second illumination light, and combines first projection light and second projection light reflected by the image forming element, and a notch filter that is disposed between the light source and the color separating and combining unit. A first dichroic filter reflects the first illumination light and the first projection light. A first incident angle of the first illumination light with respect to the first dichroic filter is different from a second incident angle of the first projection light with respect to the first dichroic filter. The notch filter attenuates light in a first wavelength band including a boundary between a wavelength band of the first illumination light and a wavelength band of the second illumination light.

A projection image display device of the present disclosure includes a light source, an image forming element that forms an image, a color separating and combining unit that separates first illumination light and second illumination light, and combines first projection light and second projection light reflected by the image forming element, and a notch filter that is disposed between the light source and the color separating and combining unit. A first dichroic filter reflects the first illumination light and the first projection light. A first incident angle of the first illumination light with respect to the first dichroic filter is different from a second incident angle of the first projection light with respect to the first dichroic filter. The notch filter attenuates light in a first wavelength band including a boundary between a wavelength band of the first illumination light and a wavelength band of the second illumination light.

The invention relates to an image sensor apparatus of a camera for detecting light. The image sensor apparatus comprises at least a first and a second sensor element and a carrier medium, wherein the carrier medium has a first and second input coupling region and a first and second output coupling region, wherein the first input coupling region has a first deflection structure which input couples light at a first given wavelength into the carrier medium in the direction of the first output coupling region, wherein the second input coupling region has a second deflection structure which input couples light at a second given wavelength into the carrier medium in the direction of the second output coupling region, wherein the first output coupling region has a first output coupling deflection structure which output couples the transmitted light from the carrier medium onto the first sensor element and wherein the second output coupling region has a second output coupling deflection structure which output couples the light onto the second sensor element.

The optical apparatus includes multiple reflective light modulators, an illumination optical system and multiple dichroic surfaces separating a light flux from the illumination optical system into multiple color lights to introduce them to the light modulators and combining the multiple color lights reflected by the light modulators. The optical system includes a condenser lens disposed between an area in which light source images are formed and the multiple reflective light modulators. The light modulators are arranged such that their long sides are parallel to a first section, and a condition of f/D1>f/D2 is satisfied where f represents a focal length of the condenser lens, D1 and D2 represent maximum effective widths of the areas in which the light source images are formed in the first section and in a second section parallel to an optical axis and orthogonal to the first section.

The optical apparatus includes multiple reflective light modulators, an illumination optical system and multiple dichroic surfaces separating a light flux from the illumination optical system into multiple color lights to introduce them to the light modulators and combining the multiple color lights reflected by the light modulators. The optical system includes a condenser lens disposed between an area in which light source images are formed and the multiple reflective light modulators. The light modulators are arranged such that their long sides are parallel to a first section, and a condition of f/D1>f/D2 is satisfied where f represents a focal length of the condenser lens, D1 and D2 represent maximum effective widths of the areas in which the light source images are formed in the first section and in a second section parallel to an optical axis and orthogonal to the first section.

To provide a light source unit which can be formed compact in size while contributing to enhancement in luminance and a projector including this light source unit, there is provided a light source unit including a first light source which emits light in a range of first wavelengths, and a second light source which emits light in a range of second wavelengths which is different from the range of first wavelengths, wherein the first light source and the second light source each include a long wavelength light emitting portion and a short wavelength light emitting portion, the long wavelength light emitting portion emitting, of lights of different wavelengths which exist in a range of light wavelengths producing light of similar colors, light of a long wavelength, the short wavelength light emitting portion emitting light of a short wavelength.

To provide a light source unit which can be formed compact in size while contributing to enhancement in luminance and a projector including this light source unit, there is provided a light source unit including a first light source which emits light in a range of first wavelengths, and a second light source which emits light in a range of second wavelengths which is different from the range of first wavelengths, wherein the first light source and the second light source each include a long wavelength light emitting portion and a short wavelength light emitting portion, the long wavelength light emitting portion emitting, of lights of different wavelengths which exist in a range of light wavelengths producing light of similar colors, light of a long wavelength, the short wavelength light emitting portion emitting light of a short wavelength.

Provided is an illuminating optical device that can reduce lowering of luminance in a display mode for enhancing color reproducibility. A multiple number of light source units (11, 19, 20) each emit a different color of light. Color wheel (28) includes multiple transmissive regions that each transmit a different color of light and that moves the point on which the incident light from each light source unit falls, over the transmissive regions as the wheel rotates. A storage (50) stores a multiple number of lighting pattern information items each item providing a lighting pattern to turn on each light source unit in a different period of lighting. A controller (60) receives a select signal for selecting one of the multiple lighting patterns to turn on each light source unit in accordance with the lighting pattern information that provides the lighting pattern selected by the select signal.

Provided is an illuminating optical device that can reduce lowering of luminance in a display mode for enhancing color reproducibility. A multiple number of light source units (11, 19, 20) each emit a different color of light. Color wheel (28) includes multiple transmissive regions that each transmit a different color of light and that moves the point on which the incident light from each light source unit falls, over the transmissive regions as the wheel rotates. A storage (50) stores a multiple number of lighting pattern information items each item providing a lighting pattern to turn on each light source unit in a different period of lighting. A controller (60) receives a select signal for selecting one of the multiple lighting patterns to turn on each light source unit in accordance with the lighting pattern information that provides the lighting pattern selected by the select signal.