Abstract: A freeform folded optical system that include two freeform prisms with optical power. At least one of the freeform prisms is configured to fold the optical axis twice. Thus, embodiments of the freeform folded optical system fold the optical axis three or four times. Folding the optical axis three or four times in the freeform prisms allows for long focal lengths required for telephoto lens applications without requiring additional lens elements between the prisms. In addition, the configuration of the freeform folded optical system provides reduced Z-axis height when compared to conventional folded lens systems with similar optical characteristics.

Abstract: Single fold optical systems that include a power prism and a lens stack including two or more refractive lens elements. The single fold optical system may provide a long mechanical back focus without increasing the Z-height of the optical system. Providing power on the prism may reduce the optical total length and reduce the X-length of the optical system. The single folded optical systems may provide reduced Z-axis height and reduced X-axis length when compared to conventional double folded optical systems with similar optical characteristics. In addition, the optical systems may include an anamorphic lens that is oriented to correct for astigmatism caused by surface errors of the reflective surface of the prism.

Abstract: An optical system for a camera may include a lens group having a plurality of lenses, a prism, and an image sensor. The prism may be positioned, optically, between the plurality of lenses and the image sensor along the optical transmitting path of the light. The prism may include at least four surfaces, which may fold the light within the prism at least four times to guide the light from the plurality of lenses passing through the prism to the image sensor. The prism may include multiple prisms joined together using an optical cement. The prism may include one or more aperture masks inside the prism to reduce flare.

Abstract: An optical system for a camera may include a lens group having a plurality of lenses, a prism, and an image sensor. The prism may be positioned, optically, between the plurality of lenses and the image sensor along the optical transmitting path of the light. The prism may include at least four surfaces, which may fold the light within the prism at least four times to guide the light from the plurality of lenses passing through the prism to the image sensor. The prism may include multiple prisms joined together using an optical cement. The prism may include one or more aperture masks inside the prism to reduce flare.

Abstract: Single fold optical systems that include a power prism and a lens stack including two or more refractive lens elements. The single fold optical system may provide a long mechanical back focus without increasing the Z-height of the optical system. Providing power on the prism may reduce the optical total length and reduce the X-length of the optical system. The single folded optical systems may provide reduced Z-axis height and reduced X-axis length when compared to conventional double folded optical systems with similar optical characteristics. In addition, the optical systems may include an anamorphic lens that is oriented to correct for astigmatism caused by surface errors of the reflective surface of the prism.

Abstract: A device may include a light-folded projector that may include an infrared (IR) light emitter and a light folding element. The light folding element may receive IR light emitted from the IR light emitter and fold the IR light one or more times to guide the IR light passing through the light folding element to exit the device to an environment. The device may also include a detector that may detect and/or recognize an object in the environment using the IR light from the light-folded projector, and a front-facing camera to capture images of the environment in front of the device.

Abstract: An optical system for a camera may include a lens group having a one or more lenses, a prism, and an image sensor. The prism may be a single element light folding prism positioned between the lenses and the image sensor along the optical transmitting path of the light. The prism may be constructed from a single, monolithic piece of stock material and may include at least four surfaces, which may fold the light within the prism at least four times to guide the light from the one or more lenses passing through the prism to the image sensor. The prism may also include one or more aperture masks inside the prism to reduce flare.

Abstract: An optical system for a camera may include a lens group having a plurality of lenses, a prism, and an image sensor. The prism may be positioned, optically, between the plurality of lenses and the image sensor along the optical transmitting path of the light. The prism may include at least four surfaces, which may fold the light within the prism at least four times to guide the light from the plurality of lenses passing through the prism to the image sensor. The prism may include multiple prisms joined together using an optical cement. The prism may include one or more aperture masks inside the prism to reduce flare.

Abstract: Single fold optical systems that include a power prism and a lens stack including two or more refractive lens elements. The single fold optical system may provide a long mechanical back focus without increasing the Z-height of the optical system. Providing power on the prism may reduce the optical total length and reduce the X-length of the optical system. The single folded optical systems may provide reduced Z-axis height and reduced X-axis length when compared to conventional double folded optical systems with similar optical characteristics. In addition, the optical systems may include an anamorphic lens that is oriented to correct for astigmatism caused by surface errors of the reflective surface of the prism.

Abstract: A freeform folded optical system that include two freeform prisms with optical power. At least one of the freeform prisms is configured to fold the optical axis twice. Thus, embodiments of the freeform folded optical system fold the optical axis three or four times. Folding the optical axis three or four times in the freeform prisms allows for long focal lengths required for telephoto lens applications without requiring additional lens elements between the prisms. In addition, the configuration of the freeform folded optical system provides reduced Z-axis height when compared to conventional folded lens systems with similar optical characteristics.

Abstract: A spectral color measuring apparatus includes a light source, an optical emitting element configured to regulate a position of the light source in an emission direction of a light flux, and to guide the light flux emitted from the light source onto a color-patch image formed on a surface of a sheet, and an urging member configured to urge the light source toward the optical emitting element in the emission direction of the light flux. With this, relative positional accuracy between the light source and the optical emitting member is enhanced, thereby enabling accurate measurement of a color of an image in a short color measuring takt (time period).

Abstract: Provided is a zoom lens, including, in order from an object side to an image side, first, second, and third lens units having positive, negative, and positive refractive powers, respectively. The second lens unit moves toward image side during zooming from a wide angle end to a telephoto end, and an interval between adjacent lens units is changed during zooming. The first lens unit includes a lens pair of a positive lens (LP1) and a negative lens (LN1) that are arranged adjacent to each other. A refractive index of a material at 400 nm wavelength, a refractive index of a material at 1,050 nm wavelength, a refractive index of a material at 1,700 nm wavelength, an Abbe number and a partial dispersion ratio of a material, Abbe numbers and partial dispersion ratios of materials for the positive lens (LP1) and the negative lens (LN1) are each appropriately set.

Abstract: An image display apparatus according to an embodiment includes a display unit and a correction unit. The display unit includes a display device configured to display an image and an optical system configured to lead light from the display device to an exit pupil. The correction unit is configured to correct a luminance level of an image displayed by the display device using a correction table. The correction table is created on the basis of a luminance distribution of an image on the display device which has been acquired at a position shifted from a position of the exit pupil in a predetermined direction by a predetermined distance.

Abstract: The image display system includes a first image producer producing a first left-eye display image using a left-eye original image that is a left-eye captured image or a left-eye processed image produced therefrom, and producing a first right-eye display image using a right-eye original image that is a right-eye captured image or a right-eye processed image produced therefrom. A first image display unit allows left and right eyes of a viewer to view the first left-eye and right-eye display images. The first image producer produces the first left-eye and right-eye display images each corresponding to an image of a partial area of the original image. A second image producer produces, using at least one of the left-eye and right-eye original images, a second display image corresponding to an image of an area including the above partial area and being wider than that partial area.

Abstract: An image display apparatus includes a display unit configured to display an observation image on a rectangular display area, an observation optical system configured to lead light from the display area to an exit pupil to present an observed image. The observation optical system has a distortion that leads a light flux from at least a first corner portion among four corner portions of the display area to the exit pupil so as to cause the light flux from the first corner portion to form the observed image that has a shape lacking its angled portion corresponding to the first corner portion. A display processor performs a non-display process that does not display the observation image in a second corner portion other than the first corner portion among the four corner portions of the display area.

Abstract: An optical apparatus includes: a light source including multiple light-emitting points arrayed in a first direction; and an imaging optical system including multiple lens optical systems arrayed in the first direction. The imaging optical system forms images of the multiple light-emitting points on a light-receiving surface. In a first cross-section and in a second cross-section, half-value of a maximum value of angle of divergence of an imaging optical flux input to the light-receiving surface, resolution, and a size of each image of the plurality of light-emitting points formed on the light-receiving surface, satisfy predetermined conditions.

Abstract: Provided is a zoom lens, comprising, in order from an object side to an image side: a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a negative refractive power; and a fourth lens unit having a positive refractive power. The second lens unit and the third lens unit are configured to move along loci different from each other during zooming. At least one lens unit of the first lens unit, the second lens unit, the third lens unit, or the fourth lens unit includes a positive lens and a negative lens that are arranged adjacent to each other, and materials for the positive lens and the negative lens are appropriately set, respectively.

Abstract: An image forming apparatus includes an exposure unit, including a plurality of light-emitting units that correspond to a respective plurality of pixels and a lens array optical system, for emitting exposure light. A photosensitive member is exposed by the exposure light from the exposure unit. A correcting unit estimates, from image data, an intensity of ghost light at a position of each pixel on the photosensitive member in a case when the photosensitive member is exposed by the exposure unit, using the image data, and corrects the image data based on the estimated intensity of the ghost light.

Abstract: The spectral color measuring apparatus includes a light source, an optical emitting element configured to regulate a position of the light source in an emission direction of a light flux, and to guide the light flux emitted from the light source onto a color-patch image formed on a surface of a sheet (P), and an urging member configured to urge the light source toward the optical emitting element in the emission direction of the light flux. With this, relative positional accuracy between the light source and the optical emitting member is enhanced, thereby being capable of accurately measuring a color of an image in a short color measuring takt (time period).

Abstract: Provided is a lens array optical system, including a plurality of lens optical systems arranged in a first direction perpendicular to an optical axis direction, each of the plurality of lens optical systems having an effective diameter in the first direction that is smaller than an effective diameter in a second direction that is perpendicular to the optical axis direction and the first direction, each of the plurality of lens optical systems being configured to form an erected image of an object in a first cross section perpendicular to the second direction and to form an inverted image of the object in a second cross section perpendicular to the first direction, and including a lens surface having a shape in the second cross section and being asymmetric with respect to an optical axis.