Abstract: The projection display apparatus includes rotation regulating elements for inhibiting a rotation of the mount ring in a tightening direction, and a stopper element displaceable between a non-locked position and a locked position, wherein the stopper element is displaced to the non-locked position when the mount ring is rotated to a rotating position in a loosening direction from a predetermined position in the tightening direction, and is displaced to the locked position when the mount ring is rotated to the predetermined position in the tightening direction.

Abstract: In order to realize with a low loss a hybrid structure in which an NRD guide is used for a transmission part and a microstrip line is used for a circuit element loading part, the present device includes: a dielectric waveguide (1) which is sandwiched between parallel conductor plates and has a gap which is less than a ½ wavelength; a microstrip line (4) which is provided on a side surface of a metal rod (3) opposite to the dielectric waveguide (1), the metal rod (3) being adjacently arranged in parallel with the dielectric waveguide (1); and a coaxial line (5) which pierces the metal rod (3) and connects the dielectric waveguide (1) with the microstrip line (4).

Abstract: A projection type display apparatus includes a projection lens barrel holding a projection lens, a micro mirror type display element, and a main body which holds the micro mirror type display element and on which the projection lens barrel is mounted. The projection lens barrel is formed with a barrel-side reference surface which becomes a mounting reference in a direction of an optical axis, and the main body is formed with a mounting reference surface against which the barrel-side reference surface abuts. The main body has an adjusting mechanism which adjusts a length between a reflection surface of the micro mirror type display element and the mounting reference surface.

Abstract: A projection type display apparatus includes a projection lens barrel holding a projection lens, a micro mirror type display element, and a main body which holds the micro mirror type display element and on which the projection lens barrel is mounted. The projection lens barrel is formed with a barrel-side reference surface which becomes a mounting reference in a direction of an optical axis, and the main body is formed with a mounting reference surface against which the barrel-side reference surface abuts. The main body has an adjusting mechanism which adjusts a length between a reflection surface of the micro mirror type display element and the mounting reference surface.

Abstract: The projection display apparatus includes rotation regulating elements for inhibiting a rotation of the mount ring in a tightening direction, and a stopper element displaceable between a non-locked position and a locked position, wherein the stopper element is displaced to the non-locked position when the mount ring is rotated to a rotating position in a loosening direction from a predetermined position in the tightening direction, and is displaced to the locked position when the mount ring is rotated to the predetermined position in the tightening direction.

Abstract: In order to realize with a low loss a hybrid structure in which an NRD guide is used for a transmission part and a microstrip line is used for a circuit element loading part, the present device includes: a dielectric waveguide (1) which is sandwiched between parallel conductor plates and has a gap which is less than a ½ wavelength; a microstrip line (4) which is provided on a side surface of a metal rod (3) opposite to the dielectric waveguide (1), the metal rod (3) being adjacently arranged in parallel with the dielectric waveguide (1); and a coaxial line (5) which pierces the metal rod (3) and connects the dielectric waveguide (1) with the microstrip line (4).

Abstract: A signal to be displayed that is output from a display signal source is upconverted and transmitted in the form of a millimeter-wave which is in turn downconverted and supplied to a flat display and displayed there.