摘要:
A screen printing device and screen printing method in which, in screen printing which is to be applied to a cavity circuit board configured by bonding board members together, printing misalignment hardly occurs. A mask member has a cavity-portion corresponding mask region MRC where a mask pattern MPC corresponding to cavity-portion electrode patterns is formed on the bottom faces of fitting portions to be fitted into cavity portions CV; and a flat-portion corresponding mask region MRF where a mask pattern MPF corresponding to flat-portion electrode patterns is formed as separate regions. Positioning between the cavity-portion corresponding mask region MRC and the cavity-portion electrode patterns is performed, and screen printing is applied. Positioning between the flat-portion corresponding mask region MRF and the flat-portion electrode patterns is performed, and screen printing is applied.
摘要:
It is an objective to provide a screen printer capable of properly cleaning a three dimensional mask member intended for a cavity substrate and a method for cleaning the screen printer. A mask member 33 includes, as separate areas, a cavity portion correspondence mask area MRC in which a mask pattern MPC corresponding to cavity portion electrode patterns 11dp are formed on bottom surfaces of fitting portions 33a to be fitted into cavity portions CV and a flat portion correspondence mask area MRF in which a mask pattern MPF corresponding to flat portion electrode patterns 12dp is formed. A cleaning unit 37 comes into contact with lower surfaces of the fitting portions 33a within the cavity portion correspondence mask area MRC, to thus clean the cavity portion correspondence mask area MRC and also comes into contact with a lower surface of the flat portion correspondence mask area MRF, to thus clean the flat portion correspondence mask area MRF.
摘要:
A cleaning device for a screen printing mask includes a paper member for rubbing a lower surface of a mask and a backup member for pressing the paper member against the lower surface of the mask via elastic members attached to an upper end portion thereof. As the backup member with the paper member pressed against the lower surface of the mask via the elastic members is relatively moved with respect to the mask, the paper member is served for rubbing the lower surface of the mask to thereby effect the wiping off of paste adhering to the lower surface of the mask.
摘要:
There is intended provision of a screen print mask cleaning unit that enables efficient wiping of paste from a screen print mask conforming to a cavity substrate, a screen printing machine, and a screen print mask cleaning method. A rubbing area 34a of a paper member 34 is rubbed against an undersurface of a mask region for a flat area (MRF), thereby wiping out paste PT adhering to the undersurface of the MRF. The rubbing area 34a of the paper member 34 is sequentially rubbed against undersurfaces of respective protruding portions 3a in a mask area for cavities (MRC), thereby wiping out the paste PT adhering to the undersurfaces of the respective protruding portions 3a. In the course of wiping of the paste PT adhering to the undersurfaces of the respective protruding portions 3a, the paper member 34 is taken up in a period from when the rubbing area 34a of the paper member 34 is separated apart from one protruding portion 3a until when the rubbing area 34a contacts another protruding portion 3a, thereby updating the rubbing area 34a of the paper member 34.
摘要:
It is an object to provide a screen printing device and screen printing method in which, in screen printing which is to be applied to a cavity circuit board configured by bonding board members together, printing misalignment hardly occurs. A mask member 33 has a cavity-portion corresponding mask region MRC where a mask pattern MPC corresponding to cavity-portion electrode patterns 11dp is formed on the bottom faces of fitting portions 33a to be fitted into cavity portions CV; and a flat-portion corresponding mask region MRF where a mask pattern MPF corresponding to flat-portion electrode patterns 12dp is formed as separate regions. Positioning between the cavity-portion corresponding mask region MRC and the cavity-portion electrode patterns 11dp is performed, and screen printing is applied. Positioning between the flat-portion corresponding mask region MRF and the flat-portion electrode patterns 12dp is performed, and screen printing is applied.
摘要:
The present invention provides a screen printing apparatus and screen printing method which, in screen printing that is to be performed on the upper surface of a circuit board, and the bottom surfaces of recess openings in the upper surface, can efficiently perform a printing work while ensuring an excellent printing quality.In a screen printing apparatus which prints a paste for bonding an electronic component on an upper surface and a bottom-surface of a recess, a printing apparatus 2(1) and a printing apparatus 2(2) which sequentially print the paste in two steps on the circuit board are placed in series. The printing apparatus 2(1) on the upstream side includes a bottom-surface printing mask which is provided in correspondence with the bottom surface of the recess, and a closed squeegee mechanism 36A which butts against and slides over an upper surface of the bottom-surface printing mask to pressurize and supply the paste. The printing apparatus 2(2) on the downstream side includes an upper-surface printing mask which is provided in correspondence with the upper surface and an opened squeegee mechanism 36B which butts against and slides over an upper surface of the upper-surface printing mask to fill the paste into pattern holes.
摘要:
The present invention provides a screen printing apparatus and screen printing method which, in screen printing that is to be performed on the upper surface of a circuit board, and the bottom surfaces of recess openings in the upper surface, can efficiently perform a printing work while ensuring an excellent printing quality. In a screen printing apparatus which prints a paste for bonding an electronic component on an upper surface and a bottom-surface of a recess, a printing apparatus 2(1) and a printing apparatus 2(2) which sequentially 10 print the paste in two steps on the circuit board are placed in series. The printing apparatus 2(1) on the upstream side includes a bottom-surface printing mask which is provided in correspondence with the bottom surface of the recess, and a closed squeegee mechanism 36A which butts against and slides over an upper surface of the bottom-surface printing mask to 15 pressurize and supply the paste. The printing apparatus 2(2) on the downstream side includes an upper-surface printing mask which is provided in correspondence with the upper surface and an opened squeegee mechanism 36B which butts against and slides over an upper surface of the upper-surface printing mask to fill the paste into pattern holes.
摘要:
A fuel vapor purging system includes a container in which a set of divided chambers are formed by partition walls. Absorbent is disposed in the divided chambers. The divided chambers are sequentially connected to form a zigzag passage. Fuel vapor can enter the container from a fuel tank via a vapor line connecting the fuel tank and the container. In the container, an end of the vapor line faces the divided chamber which occupies an end of the set of the divided chambers. In the container, the fuel vapor is absorbed by the absorbent. Air can escape from the container via an opening in the container. The fuel vapor can be separated from the absorbent. The separated fuel vapor can be drawn into a suitable drawing device such as an engine air induction device via a purge line connecting the container and the drawing device. Fresh air can flow into the container via an air inlet provided on the container. Among the divided chambers, at least the divided chamber which occupies the end of the set of the divided chambers has a cross-sectional area equal to or smaller than 40 cm.sup.2.
摘要:
A drive circuit for an electrostrictive element actuator for a fuel injection apparatus of a diesel engine. The drive circuit has a condenser adapted to be charged with electric charges generated by the electrostrictive element actuator; a combination of an electric charge transferring switching element and a rectifier element for becoming conductive in a first period and charging electric charges generated by the electrostrictive element actuator to the condenser; and a combination of an electric charge returning switching element and a rectifier element for becoming conductive in a second period, other than the first period, and returning electric charges stored in the condenser to the electrostrictive element actuator.
摘要:
In an apparatus for controlling an electroexpansive actuator, a high voltage is applied to the electroexpansive actuator at a non-load state after an expansion and contraction operation thereupon is completed.