Abstract: A projector includes: a mounting unit for mounting optional unit (2) having an extension function section, connection substrate (7), and cable (6) for electrically connecting the extension function section and connection substrate (7); mother substrate (31) having connector (31a) to which terminal (7a) is electrically connected; Z-shaped guide metal fitting (40) located on the mounting unit and configured to movably guide terminal (7a) to connector (31a); and a case having mother substrate (31) located therein. One side face of the case has an opening for inserting/removing optional unit (2) into/from the case, and a side panel for covering the opening being removably located in the opening. When optional unit (2) is inserted into the case from the opening, connection substrate (7) is guided by Z-shaped guide metal filling (40), and optional unit (2) functions when terminal (7a) is electrically connected to connector (31a).

Abstract: Provided is a substrate connecting structure that includes a support housing to which a main substrate is attached, and a shield housing for housing a relay substrate, the support housing being provided with a first opening for exposing a first connector provided in the main substrate, a first guide, and a pair of hinges, the shield housing being provided with a second opening for exposing a second connector provided in the relay substrate, and a second guide that works cooperatively with the first guide, the first guide and the second guide guiding the shield housing so that the shield housing can move perpendicularly to a main surface of the support housing provided with the first opening, ends of the pair of hinges being located between the shield housing and the support housing and being adapted to be rotated to separate the shield housing from the support housing.

Abstract: Provided is a substrate connecting structure that includes a support housing to which a main substrate is attached, and a shield housing for housing a relay substrate, the support housing being provided with a first opening for exposing a first connector provided in the main substrate, a first guide, and a pair of hinges, the shield housing being provided with a second opening for exposing a second connector provided in the relay substrate, and a second guide that works cooperatively with the first guide, the first guide and the second guide guiding the shield housing so that the shield housing can move perpendicularly to a main surface of the support housing provided with the first opening, ends of the pair of hinges being located between the shield housing and the support housing and being adapted to be rotated to separate the shield housing from the support housing.

Abstract: The present invention includes: a circuit board which is provided with an electronic circuit part; a first case and a second case (7) that cover the electronic circuit part; a fixing screw that fixes the first case and the second case (7); a tamper switch that outputs a signal indicating that the switch member is in a first state or second state; and a cap block (11) which is attached to the second case (7) so that the tamper switch keeps the first state only when the cap block (11) covers the fixing screw.

Abstract: A projector includes: a mounting unit for mounting optional unit (2) having an extension function section, connection substrate (7), and cable (6) for electrically connecting the extension function section and connection substrate (7); mother substrate (31) having connector (31a) to which terminal (7a) is electrically connected; Z-shaped guide metal fitting (40) located on the mounting unit and configured to movably guide terminal (7a) to connector (31a); and a case having mother substrate (31) located therein. One side face of the case has an opening for inserting/removing optional unit (2) into/from the case, and a side panel for covering the opening being removably located in the opening. When optional unit (2) is inserted into the case from the opening, connection substrate (7) is guided by Z-shaped guide metal filling (40), and optional unit (2) functions when terminal (7a) is electrically connected to connector (31a).

Abstract: A structure for cooling a lamp used for a projection type display apparatus is provided. The structure comprises a lamp house for housing a lamp that is operable as a light source, said lamp house being configured to be installed in a housing of said projection display apparatus; and a fan for supplying cooling air into said lamp house. The lamp house comprises a removable lamp house cover, and an exhaust duct for said cooling air is integrated with said lamp house cover.

Abstract: A projection display apparatus generates image light by modulating, with an image signal, light emitted from a light source disposed in a lamp house, and projects the generated image light onto a screen. The projection display apparatus has an air inlet duct for introducing air, to cool the light source, into the lamp house and an air outlet duct for expelling the air discharged from the lamp house out of the projection display apparatus. The air outlet duct has an opening defined in a side wall thereof, and a lid pivotally mounted thereon for selectively opening and closing the opening. The lid is not opened under normal pressure in the air outlet duct when the light source operates normally, and is opened when an abnormal pressure buildup higher than the normal pressure is applied to the lid, thereby releasing the pressure buildup.