Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: A method of bidding online services is disclosed. The method includes following steps: receiving a service request from a user; executing a pairing process to search a service satisfying the service request; executing a bidding process to select at least one of plurality of users when determining that the service has been assigned to another user; re-assigning the service to the selected user; establishing a communication between the selected user and a provider of the service for enabling the provider to provide online service to the user once receiving a using request from the user and a providing request from the provider.

Abstract: An engagement structure of a filter comprises an upper cover; a middle side of the upper cover being formed with an outer thread; a tapered portion being extended from a lower end of the portion of the upper cover having the outer thread; and a tube having a flange at an upper side thereof; an inner side of the tube being formed with an inner thread which is corresponding to the outer thread of the upper cover; a tapered hole being extended at an inner side of the tube and below the portion of the tube having the inner thread; the tapered hole having a shape corresponding to that of the tapered portion of the upper cover. An outer periphery of the tapered portion or an inner periphery of the tapered hole is formed with a plurality of annular grooves for receiving a plurality of washers.

Abstract: A drain proof washer for sealing water within a filter is disclosed. The drain proof washer is installed at an opening of the filter and is installed between the opening of the filter and a water tube so that water will not drain out from a connection between the opening and the water tube. The drain proof washer comprises a circular ring having an approximate-rectangular cross section; the angle of each of three corners of the approximate-rectangular cross section of the ring being 90 degree and an outer surface of the ring is smooth without any hair. The other corner is a convex round edge.

Abstract: A joint used in one of a water inlet or water outlet of a filter cylinder, or a water inlet or a water outlet of a filter casing is disclosed. The joint is a round cylindrical tube and comprises at least one first waterproof washer installed near one end of the round cylindrical tube; an outer thread on an outer surface of the round cylindrical tube and behind the waterproof washer; an opening away from the washer is a round opening and an interior of the round cylindrical tube is formed as a polygonal hole; a front end of the T shape sleeve have a plurality of tapered claws the waterproof washer encloses the front end of the T shape sleeve so as to be expanded by the tapered claws; thereby the round cylindrical tube; and a water tube.

Abstract: A filter cover with a rapid assembled connector used in a water inlet and a water outlet of the filter cover comprises two round tube; each having a washer at a first end thereof which serves to be inserted into a casing; at least one block being protruded from a periphery of the round tube; a buckling sheet being backwards extended at one end of each block; a second end of the round tube being used to be connected to other tubes; a casing having a water inlet and a water outlet; the water inlet having a first opening extending inwards into the casing; the water outlet having a second opening extending inwards into the casing; sizes of the first and second openings being slightly larger than the that of the block; the first opening having at least first hole; and the second opening having at least one second hole.

Abstract: A pressure-stable cylinder comprises a cover having a dome shape groove and a through hole; an inner wall of the dome shape groove having threads; a cylinder having an opening and an opening section around the opening having a threaded tapered shape matching to the dome shape groove of the cover; the opening section of the cylinder being formed with a plurality of first washers; one end of the opening section having a coupling groove and a second washer; a bellow coupled to the second washer; a disk placed below the bellow; and a compressible spring placed between the disk and a bottom of the cylinder; the compressible spring resisting against the disk so that the cylinder has a predetermined pressure. In assembly, the washer and the bellow are steadily fixed to the coupling groove of the cylinder. The washers have an effect of draining-proof and air-tightness.

Abstract: A pressure-stable cylinder comprises a cover having a dome shape groove and a via hole; an inner wall of the dome shape groove having threads; a cylinder having an opening and an opening section around the opening having a threaded tapered shape matching to the dome shape groove of the cover; the opening section of the cylinder being formed with a plurality of first washers; one end of the opening section having a coupling groove and a second washer; a snake-like film coupled to the second washer; a disk placed below the snake-like film; and a compressible spring placed between the disk and a bottom of the cylinder; the compressible spring resisting against the disk so that the cylinder has a predetermined pressure. In assembly, the washer and the snake-like film are steadily fixed to the coupling groove of the cylinder. The washers have an effect of draining-proof and air-tightness.