Abstract: A virtual image display device includes: an image projection unit that selectively projects a first projection light linearly polarized in a first direction and a second projection light linearly polarized in a second direction orthogonal to the first direction to a windshield; a reflected light measurement unit that measures an intensity of light incident from the windshield into the image projection unit along a light path in which the first projection light and the second projection light are projected; and a determination unit that determine whether a user is wearing polarized sunglasses that shield a component linearly polarized in the first direction, based on a first light intensity measured by the reflected light measurement unit when the first projection light is projected and a second light intensity measured by the reflected light measurement unit when the second projection light is projected.

Abstract: A display apparatus projects an image of an object located in an area outside a mobile body onto a target projection surface, the target projection surface being set in a cabin of the mobile body and having a first region and a second region. The display apparatus includes: an image data acquisition unit that acquires image data; an image processing unit that generates projection image data by performing image conversion processing including color conversion in which the first wavelength light is selected for a pixel corresponding to the first region and the second wavelength light is selected for a pixel corresponding to the second region based on region distribution information; a light source unit that emits light selected from either the first wavelength light or the second wavelength light; and a projection unit that projects the image formed by the emitted light onto the target projection surface.

Abstract: A virtual image display device includes an intermediate image formation unit on which a real image based on an image display light is formed. The intermediate image formation unit includes a principal surface on which a first area, a second area, and a third area are arranged in a stated order in a predetermined direction, and a reflective part. The first area is provided with a transmission-type screen on which a first display light forms an image, and the third area is provided with a reflection-type screen on which a second display light forms an image. The first display light is transmitted through the transmission-type screen, reflected by the reflective part, transmitted through the second area, and output toward a projection mirror. The second display light is reflected by the reflection-type screen and output toward the projection mirror.

Abstract: A virtual image display device includes: an image projection unit that selectively projects a first projection light linearly polarized in a first direction and a second projection light linearly polarized in a second direction orthogonal to the first direction to a windshield; a reflected light measurement unit that measures an intensity of light incident from the windshield into the image projection unit along a light path in which the first projection light and the second projection light are projected; and a determination unit that determine whether a user is wearing polarized sunglasses that shield a component linearly polarized in the first direction, based on a first light intensity measured by the reflected light measurement unit when the first projection light is projected and a second light intensity measured by the reflected light measurement unit when the second projection light is projected.

Abstract: A virtual image display device includes: a display unit that generates an image display light; and a projection optical system including a main concave mirror that reflects the image display light toward the virtual image presentation plate and an auxiliary concave mirror that reflects the image display light toward the main concave mirror. Defining a reference plane along both a direction of incidence and a direction of output of the image display light on the virtual image presentation plate, the main concave mirror is provided in an orientation that causes the image display light to be incident on the main concave mirror in a direction along the reference plane, and the auxiliary concave mirror is provided in an orientation that causes the image display light to be incident on the auxiliary concave mirror in a direction intersecting the reference plane.

Abstract: A display apparatus projects an image of an object located in an area outside a mobile body onto a target projection surface, the target projection surface being set in a cabin of the mobile body and having a first region and a second region. The display apparatus includes: an image data acquisition unit that acquires image data; an image processing unit that generates projection image data by performing image conversion processing including color conversion in which the first wavelength light is selected for a pixel corresponding to the first region and the second wavelength light is selected for a pixel corresponding to the second region based on region distribution information; a light source unit that emits light selected from either the first wavelength light or the second wavelength light; and a projection unit that projects the image formed by the emitted light onto the target projection surface.

Abstract: A display apparatus is a display apparatus that projects an image onto a target projection surface having a first region in which a first wavelength light is reflected and a second region in which the first wavelength light is transmitted and in which visible light is emitted by receiving a second wavelength light that is different from the first wavelength light. The display apparatus includes: a wavelength selection unit that selects the first or the second wavelength light in accordance with a projection region based on region distribution information which is information about a distribution of the first and the second regions on the target projection surface; a light source unit that emits light selected from either the first or the second wavelength light; and a projection unit that projects the image formed by the emitted light onto the target projection surface.

Abstract: A virtual image display device includes: a display unit that generates an image display light; and a projection optical system including a main concave mirror that reflects the image display light toward the virtual image presentation plate and an auxiliary concave mirror that reflects the image display light toward the main concave mirror. Defining a reference plane along both a direction of incidence and a direction of output of the image display light on the virtual image presentation plate, the main concave mirror is provided in an orientation that causes the image display light to be incident on the main concave mirror in a direction along the reference plane, and the auxiliary concave mirror is provided in an orientation that causes the image display light to be incident on the auxiliary concave mirror in a direction intersecting the reference plane.

Abstract: An image drawing device includes a laser light source controller controlling a laser light output timing of a laser light source unit and an output value of laser light so that a drawing image based on input image data is generated in a scanning region; a scanner controller controlling scanning so that the laser light is scanned with an amplitude; and a characteristic detection controller controlling the scanner controller to scan in a range in which an amplitude of scanning exceeds a scanning range corresponding to an amplitude when the laser light output value is adjusted, control the laser light source controller to output characteristic detection laser light during scanning outside of a range in which the drawing image is generated and beyond the amplitude of the scanning range, and adjust the output value of the laser light based on a detected output value of the characteristic detection laser light.

Abstract: A virtual image display device includes an intermediate image formation unit on which a real image based on an image display light is formed. The intermediate image formation unit includes a principal surface on which a first area, a second area, and a third area are arranged in a stated order in a predetermined direction, and a reflective part. The first area is provided with a transmission-type screen on which a first display light forms an image, and the third area is provided with a reflection-type screen on which a second display light forms an image. The first display light is transmitted through the transmission-type screen, reflected by the reflective part, transmitted through the second area, and output toward a projection mirror. The second display light is reflected by the reflection-type screen and output toward the projection mirror.

Abstract: An image display apparatus includes a laser light source unit configured to output a luminous flux, a scanning mirror unit configured to reflect the luminous flux by reciprocating driving in a main-scanning direction and a sub-scanning direction, a light source driving unit configured to drive the light source unit based on image data, a bit shift processing unit configured to adjust a brightness value of a pixel included in the image date, and a dimming processing unit configured to perform control in such a manner that a brightness value of a pixel included in the image data is not displayed as zero with respect to the image data subjected to dimming processing by the bit shift processing unit according to a predetermined rule.

Abstract: An image drawing device includes a laser light source controller controlling a laser light output timing of a laser light source unit and an output value of laser light so that a drawing image based on input image data is generated in a scanning region; a scanner controller controlling scanning so that the laser light is scanned with an amplitude; and a characteristic detection controller controlling the scanner controller to scan in a range in which an amplitude of scanning exceeds a scanning range corresponding to an amplitude when the laser light output value is adjusted, control the laser light source controller to output characteristic detection laser light during scanning outside of a range in which the drawing image is generated and beyond the amplitude of the scanning range, and adjust the output value of the laser light based on a detected output value of the characteristic detection laser light.

Abstract: An image display apparatus includes a laser light source unit configured to output a luminous flux, a scanning mirror unit configured to reflect the luminous flux by reciprocating driving in a main-scanning direction and a sub-scanning direction, a light source driving unit configured to drive the light source unit based on image data, a bit shift processing unit configured to adjust a brightness value of a pixel included in the image date, and a dimming processing unit configured to perform control in such a manner that a brightness value of a pixel included in the image data is not displayed as zero with respect to the image data subjected to dimming processing by the bit shift processing unit according to a predetermined rule.

Abstract: An optical pickup includes a first laser beam light source 1 for emitting a light flux of a first wavelength, a diffraction grating 5 and an optical device 6 having a second laser beam light source 7 for emitting a light flux of a second wavelength and a hologram element 8. In operation, the diffraction grating 5 diffracts the backward light of the first wavelength at a predetermined angle. The hologram element 8 diffracts the backward light of the second wavelength by a first area 8a and also diffracts the backward light of the first wavelength at a reversed-polarity angle to the first area 8a by a second area 8b.

Abstract: An optical device includes a sub-mount 2 mounting first and second semiconductor lasers 1a, 1b and having an onboard part for the semiconductor lasers and an optical-path conversion mirror 7 integrated with each other, and a light receiving element 11 arranged on a light receiving element substrate to have first and second light receiving regions separated from each other by at least one parting line. In the optical device, one light gravity center of an optical spot, which is formed on the light receiving element 11 by homeward flux of light emitted from the first semiconductor laser 1a and reflected by an optical disc 55, and another light gravity center of an optical spot, which is formed on the light receiving element 11 by homeward flux of light emitted from the second semiconductor laser 1b and reflected by the optical disc 55 are together positioned on the parting line.

Abstract: In a photo pickup device, an incident area 30 for a reflection light of a light spot is divided into four areas 30a˜30d by parting lines 31, 32 making axial-symmetrical angles with a direction Y of a projected track on an optical disc. In these areas, the so-divided areas 30a, 30c are formed so as to diffract the light in one or more directions in a range of 90 degrees±20 degrees to the direction Y and impress misalignment on each diffraction light. In each diffraction light, two focal lines produced due to the astigmatism make approx. 45 degrees with the direction Y of the projected track. Further, the divided areas 30b, 30d are characterized by diffracting the light in one or more directions in a range of 90 degrees±20 degrees to the direction Y.

Abstract: An optical device diffracts incident light with a hologram element and receives the diffracted light with light receiving faces 20A to 29 on a light receiving element. Reflected sub-beams used for a tracking operation are received with different ones of the light receiving faces depending on the wavelengths of the reflected sub-beams. When first light receiving faces 22, 23, 26, and 27 are receiving an incident beam of a first wavelength, output signals from the first light receiving faces and output signals from the other light receiving faces 24, 25, 28, and 29 are processed to detect an unnecessary light component. The optical device can record and/or reproduce information signals to and/or from optical discs such as DVDs and CDs which need light sources of different wavelengths, without the influence of unnecessary reflected light from the optical discs or without complicating operation of output signals.

Abstract: An optical device includes a sub-mount 2 mounting first and second semiconductor lasers 1a, 1b and having an onboard part for the semiconductor lasers and an optical-path conversion mirror 7 integrated with each other, and a light receiving element 11 arranged on a light receiving element substrate to have first and second light receiving regions separated from each other by at least one parting line. In the optical device, one light gravity center of an optical spot, which is formed on the light receiving element 11 by homeward flux of light emitted from the first semiconductor laser 1a and reflected by an optical disc 55, and another light gravity center of an optical spot, which is formed on the light receiving element 11 by homeward flux of light emitted from the second semiconductor laser 1b and reflected by the optical disc 55 are together positioned on the parting line.

Abstract: An optical pickup includes a first laser beam light source 1 for emitting a light flux of a first wavelength, a diffraction grating 5 and an optical device 6 having a second laser beam light source 7 for emitting a light flux of a second wavelength and a hologram element 8. In operation, the diffraction grating 5 diffracts the backward light of the first wavelength at a predetermined angle. The hologram element 8 diffracts the backward light of the second wavelength by a first area 8a and also diffracts the backward light of the first wavelength at a reversed-polarity angle to the first area 8a by a second area 8b.

Abstract: In a photo pickup device, a hologram element 13 is divided into eight areas. In operation, the hologram elements adds different lens powers to four diffraction lights forming two pairs of diffraction-light groups. In the photo pickup device, a light receiving element 19 is divided into four areas to receive these diffraction lights. The photo pickup device outputs signals corresponding to four quadrants A, B, C and D forming a reflection light from an optical disc 5, allowing a focus-error signal to be calculated in the same logic as an “astigmatism method”.