Abstract:
PROBLEM TO BE SOLVED: To make an optical module reduced in the number of components and small in size by eliminating the need to interpose a spacer for fixation between an optical filter and a lens when the optical filter is incorporated in a lens barrel. SOLUTION: In this optical module 6 provided with a lens barrel 8 having a stop part 8A in one body and a lens 11 and an optical filter 10 incorporated in the lens barrel 8, a holding part 11C is formed integrally with the outer peripheral part of the lens 11 projectingly from an effective surface 11A of the lens along the lens thickness to restrict the position of the optical filter 10 in an optical axis direction, thereby eliminating the need for a component such as a spacer for fixation.
Abstract:
PROBLEM TO BE SOLVED: To provide a three-dimensional image pickup device by which image signals of a plurality of images with sufficient parallax can be obtained without the need for a separation circuit in spite of a comparatively simple configuration and a small size. SOLUTION: In this three-dimensional image pickup device, a stereo optical system 1 forms a plurality of object images with parallax and by photographing the same object at different view points apart from each other to a plurality of image pickup elements 2L, 2R that are mounted closely to each other on one semiconductor substrate, and image processing circuits 10L, 10R having the identical characteristic provided corresponding to the image pickup elements 2L, 2R process separately output signals from the image pickup elements 2L, 2R respectively.
Abstract:
PROBLEM TO BE SOLVED: To enable even optical disks different from each other in the thickness of a substrate to be correctly reproduced with one optical pickup by providing a polarizing hologram element transmitting one component among the component of the ordinary ray and the component of the extraordinary ray of light beams heading to an optical disk and diffracting other component. SOLUTION: When an optical disk D of a thick substraste is reproduced, light beams emitted from a semiconductor laser element 11 transmit a beam splitter 12 to be converted into parallel light rays by a collimating lens 15. The component becoming an ordinary ray in regard to the optical axis of a polarizing hologram element 16 among the light beams from the lens 15 does not receive the action of the hologram surface 16a and is made incident on an objective lens 13. These light beams are correctly focused on the signal recording surface D1 of the optical disk D. Besides, when a second optical disk of a thin substrate is reproduced, the component becoming an extraordinary ray in regard to the optical axis of the element 16 receives the action of the surface 16a and the light beams are correctly focused on the recording surface D2 of the optical disk D.
Abstract:
PURPOSE:To obtain an optical pickup of a magneto-optical disc apparatus, etc., which facilitates the improvement of the S/N ratio of a reproduced signal with a simple construction and an optical device which is applied to the optical pickup like this. CONSTITUTION:An incident light is decomposed into components which are perpendicular to each other by a first diffraction device 30. The first component is emitted as a first-order diffracted light and a first-order diffracted light and the second component is emitted as a zero-order diffracted light. By a following second diffraction device 31, the first and second components are further decomposed into components which are perpendicular to each other and partially emitted.
Abstract:
PURPOSE:To project a required number of laser lights at a required amount by providing a reflecting mirror which reflects laser lights emitted from two or more laser light sources onto a substrate and projects the laser lights approximately perpendicularly to a plane of the substrate. CONSTITUTION:A light-emitting element chip 21 is formed by uniting two laser diode chips 21a and 21b in a semiconductor manufacture process. The light emitting element chip 21 is sealed in a semiconductor package, thereby to obtain a light emitting element 21. The first laser diode chip 21a has a resonator formed to extend in a direction from the upper left to the lower right of the drawing. The resonator projects laser lights L2 and L3 from both end faces thereof. The laser lights L2 and L3 are projected to be straight at right angles from the light emitting element chip by reflecting mirrors 21c and 21d arranged on optical axes of the lights L2 and L3. Accordingly, an optical pickup 20 casts the laser lights L2 and L3 to a magnetooptic disc in place of the conventional (+) first order diffraction light and a (-) first order diffraction light.
Abstract:
PURPOSE:To reduce the weight and size by holding an objective lens in the biaxial directions, i.e., the optical axis and the tracking direction, through a leaf spring of a shape-memory alloy, heating the leaf spring by feeding a current thereto, and positioning the objective lens by the recovery force produced through shape-memory effect. CONSTITUTION:A plate 13 comprises upper and lower covers 13a, b and a base 12 fixed with an objective lens 11 is held between the covers 13a, b such that the objective lens 11 can move in the tracking direction perpendicular to the optical axis. A biaxial base 14 comprises three plate members substantially defining a triangular prism which supports the plate 13 movably in the direction of optical axis, i.e., the focusing direction. U-shaped leaf springs 16a, b made of a conductive shape-memory alloy, e.g. an TiNi alloy, links the upper and lower covers 13a, b to the upper and lower ends of the biaxial base 14 thus holding the objective lens 11 through the plate 13 at a position in the direction of optical axis through. The leaf springs 16a, b are fed differentially with currents and heated to produce a recovery force through shape-memory effect thus effecting the focusing operation.
Abstract:
PROBLEM TO BE SOLVED: To uniform luminance in each projection image when images projected from a plurality of projector apparatuses are to be displayed on a screen in an overlapped state. SOLUTION: An image projection system comprises the plurality of projector apparatuses 1-1 to 1-N for overlapping images based on input image signals by mutually shifting the images by a prescribed amount and projecting the overlapped images to the screen, an observation part 4 for observing the luminance of an image area composed of a plurality of projection images projected to the screen, and a control device 5 for adjusting the luminance values of respective pixels composing an image projected by each projector apparatus on the basis of the observation result of the observation part 4 and supplying the adjusted luminance values to the plurality of projector apparatuses. An optional pixel in the image area is overlapped by corresponding pixels of projection images from the plurality of adjacent projector apparatuses and the length of one side of each projection image is n times (n is an integer of 2 or more) as long as a distance between adjacently arranged projector apparatuses. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a projection type display device capable of full-color display of an image projected on a screen with a simple device composition. SOLUTION: Laser beams A, B, C emitted from different three optical elements are made incident into a beam combining prism 3A. The laser beams made incident into the beam combining prism 3A are superimposed on the same optical axis. When the optical axis is made vertical to an emission surface of the beam combining prism 3A, the laser beams are emitted vertically by the beam combining prism 3A. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a rear projection display apparatus which has simple apparatus constitution and a large screen and is made low-profile. SOLUTION: The rear projection display apparatus 100 is characterized in that it has: a light source 1 which directly modulates and emits light; an optical element 2 which converts the light emitted from the light source 1 into a substantially parallel light beam; a scanning part 3 which scans the substantially parallel light beam converted with the optical element 2 and makes the beam incident on a screen 5; and a screen light guide mirror 4 of which the dimension in the direction of height is 1/2 or larger than that of the screen 5 and reflects the light scanned with the scanning part 3 and makes the light incident on the screen 5. COPYRIGHT: (C)2008,JPO&INPIT