Patent ID: 8186813
Filing Date: 2012-05-29
Classification: B41J

Abstract:
1. A liquid supply device comprising: a liquid supply passage which supplies a liquid from an upstream side on which the liquid is supplied from a liquid supply source to a downstream side on which the liquid is consumed; a pump which is provided with a pump chamber in the liquid supply passage; a passage forming member which has a certain shape in which the liquid supply passage is formed; and a flexible diaphragm forming member which is provided with a diaphragm which forms a part of a wall surface of the pump chamber and is displaceable to increase or decrease the volume of the pump chamber, wherein a lamination structure is formed by laminating the diaphragm forming member and the passage forming member so as to form the pump chamber between the facing surfaces thereof, and wherein a portion corresponding to the outer circumference of the diaphragm forming member in the lamination structure is provided with an outer circumference sealing portion which prevents the liquid, which has leaked from the liquid supply passage to a space between the facing surfaces of the diaphragm forming member and the passage forming member, from flowing outside the lamination structure, wherein the outer circumference sealing portion is formed in a convex shape from the diaphragm forming member so as to come in pressing contact with the passage forming member when the diaphragm forming member and the passage forming member are laminated.