Abstract: Provided are a mechanical tube fitting for preventing bending fracture of a tube member to be joined when subjected to bending deformation, and a simple tube fitting structure including that tube fitting. In the tube fitting, a clearance between a tube member (32) to be joined and an outer pipe (12) or an inner pipe (14) which is coaxially inserted in the outer pipe (12) and gives a space between its outer surface and the inner surface of the outer pipe (12), in which space the tube member (32) is inserted, is sealed with a sealing member disposed between the outer pipe (12) and the inner pipe (14), and the above-mentioned components are fixed by caulking. The outer pipe (12) is configured to extend outwardly in its axial direction than the ends of the inner pipe (14).

Abstract: Provided are a mechanical tube fitting for preventing bending fracture of a tube member to be joined when subjected to bending deformation, and a simple tube fitting structure including that tube fitting. In the tube fitting, a clearance between a tube member (32) to be joined and an outer pipe (12) or an inner pipe (14) which is coaxially inserted in the outer pipe (12) and gives a space between its outer surface and the inner surface of the outer pipe (12), in which space the tube member (32) is inserted, is sealed with a sealing member disposed between the outer pipe (12) and the inner pipe (14), and the above-mentioned components are fixed by caulking. The outer pipe (12) is configured to extend outwardly in its axial direction than the ends of the inner pipe (14).

Abstract: The current addition type D/A converter of the present invention is equipped with a control circuit to reduce power consumption. A control signal is input from a control terminal (17), the resistance value of a resistor (10) that determines a reference current of a current mirror is multiplied n-fold and thereby the operating current of current cell matrix (1) is reduced to (1/n). On the other hand, the resistance value of a current/voltage conversion resistor (16) is multiplied n-fold so as to compensate the reduction of the operating current and maintain a predetermined D/A conversion rate. Normally, there is no input near an upper limit of the input dynamic range, and therefore there is no inconvenience regarding the conversion rate of the D/A converter even if the operating current is reduced.