The present disclosure provides a projection lens and a projector. The projection lens includes: a first lens, a second lens, a third lens, a triple-cemented lens, a fourth lens, a prism, and a DMD chip that are successively disposed along an optical axis from an image side to an object side; wherein the first lens has a negative focal power, the second lens has a negative focal power, the third lens has a positive focal power, the triple-cemented lens has a positive focal power, and the fourth lens has a positive focal power.

The present disclosure provides a dual reflective micro projection optical engine. The dual reflective micro projection optical engine includes a light source and a DMD chip, and a collimating light-combining module, a fly-eye lens, a reflective mirror, a diopter prism, a prism assembly, and a projection lens that are successively disposed in a light exit direction of the light source.

The present disclosure provides a dual reflective micro projection optical engine. The dual reflective micro projection optical engine includes a light source and a DMD chip, and a collimating light-combining module, a fly-eye lens, a diopter prism, a reflective mirror, a relay lens, a prism assembly, and a projection lens that are successively disposed in a light exit direction of the light source, wherein a light incident surface and a light exit surface of the diopter prism are freely-curved surfaces.

An image projection apparatus includes a light source to emit light, an image generation unit including an image generation element to generate an image using the light emitted from the light source, an optical unit to guide the light emitted from the light source to the image generation unit, and to enlarge and project the image generated by the image generation unit, a drive unit to change any one of a position of the image generation element and a position of at least a part of the optical unit at specific timing, and a cooling device to cool one or more parts disposed in the image projection apparatus. An operation sound generated by the cooling device while the cooling device is being operated has a given frequency characteristic settable according to a drive frequency of the drive unit.

A projector includes a light source, a filter unit, an auxiliary light source and a combiner. The light source produces a first beam of light having light in a plurality of ranges of wavelengths, corresponding to a plurality of colors. The filter unit is positioned in the optical path of the first light beam. The filter unit is configured in a first configuration during a first time interval and in a second configuration during a second time interval. When the filter unit is configured in the second configuration, the auxiliary light source produces a second beam of light. The combiner combines the first beam of light and the second beam of light. The combined beams of light are directed to a spatial light modulator.

In an optical module and a scanning-type image display device, a reduction in heat insulating effect due to a natural convection generated between the optical module and a case is suppressed to alleviate laser overheating and thermal expansion or contraction of each component and obtain a stable projection image quality. In an optical module that couples laser beams from a plurality of laser beam sources 1a, 1b, 1c and irradiates the laser beams to a desired position, a cover that covers the optical module is provided, a second cover is provided in a space between the optical module and the cover, and a projecting part is provided on a surface of the second cover facing the optical module.

A projector, an image projection method, and a recording medium storing a program. The projector includes a color wheel configured to divide light by time into light rays of a plurality of colors including at least a first color and a second color, the light forming an image to be projected, an image generator configured to generate the image including a plurality of pixels from the light rays divided by time by the color wheel, a shifting member configured to shift the plurality of pixels of the image formed by the first color and the second color, with varying shifting speeds, a color-wheel controller configured to control the color wheel, a shifting controller configured to control the shifting member, and a timing controller configured to generate a first timing signal for controlling timings of the color wheel and a second timing signal for controlling timings of the shifting member.

An illumination device configured to emit illumination light has a light source arranged inside a housing generating the illumination light; a diffusing panel attached to the housing; and a projector arranged inside a space formed by the housing and a part of the diffusing panel for projecting an image onto a projection surface. An optical unit is arranged so that an incident direction of a light flux incident from a display element provided in the projector onto a projection optical system of the projector is substantially vertical or in a direction closer to a vertical direction than a direction parallel to a horizontal plane, or so that an optical axis of the projection optical system on which the light flux from the display element provided in the projector is incident is substantially vertical or in a direction closer to the vertical direction than the direction parallel to the horizontal plane.

Embodiments of the present disclosure, relating to the field of micro projector engines, provide a micro projection optical engine with a compact layout, small size, and convenient portability. The micro projection optical engine includes a light source and a DMD chip, and a collimating light-combining module, a fly-eye lens, a relay system, a curved prism, a triangular prism, and a projection lens that are successively disposed in a light exit direction of the light source.

Embodiments of the present disclosure, relating to the field of micro projector engines, provide a micro projection optical engine with a compact layout, small size, and convenient portability. The micro projection optical engine includes a light source and a DMD chip, and a collimating light-combining module, a fly-eye lens, a relay system, a first triangular prism, a second triangular prism, and a projection lens that are successively disposed in a light exit direction of the light source.