Abstract: Even when used at a high rotation speed, outside parts in relation to the radial direction of a cage 3, of the circumferential parts of a pocket 7 are kept from being worn away by outside end surfaces 21 of rollers 2. Moreover the rollers 2 are kept from sliding on the inside the pockets 7, to thereby stabilize the performance of rotation support parts. The outside end surface 21 of the roller 2 is made a ball convex surface, so that the center part of the outside end surface 21 can be freely in contact with the inner peripheral surface of a second outside cylindrical portion 14. In a condition with the rollers 2 displaced radially outward of the cage 3 due to centrifugal force, a PV value of a rubbing part between the outside end surface 21 and the opposite surface is kept low, and the wear of this rubbing part is suppressed.

Abstract: Even when used at a high rotation speed, outside parts in relation to the radial direction of a cage 3, of the circumferential parts of a pocket 7 are kept from being worn away by outside end surfaces 21 of rollers 2. Moreover the rollers 2 are kept from sliding on the inside the pockets 7, to thereby stabilize the performance of rotation support parts. The outside end surface 21 of the roller 2 is made a ball convex surface, so that the center part of the outside end surface 21 can be freely in contact with the inner peripheral surface of a second outside cylindrical portion 14. In a condition with the rollers 2 displaced radially outward of the cage 3 due to centrifugal force, a PV value of a rubbing part between the outside end surface 21 and the opposite surface is kept low, and the wear of this rubbing part is suppressed.

Abstract: An electronic apparatus system in which an electronic apparatus such as a personal computer and an expansion device are combined so as to be freely joined and separated. A charging circuit, a control circuit, and a chargeable battery are provided for each of the electronic apparatus and the expansion device. In a state in which the electronic apparatus and the expansion device are separated, the control circuit of the electronic apparatus controls the charging circuit of the electronic apparatus, thereby charging the battery of the electronic apparatus. The control circuit of the expansion device controls the charging circuit of the expansion device, thereby charging the battery of the expansion device.

Abstract: A battery pack and a device, each including a CPU, communicate with each other. When the battery pack is mounted to the device, the CPU of the device reads a voltage V, output from dry cells built in the battery pack, from a positive terminal. The CPU sends a ready signal, and compares the read dry-cell voltage V, and a dry-cell voltage included in dry-cell state information sent from the CPU of the battery pack, in response to the sent ready signal. When the voltages match, the CPU of the device outputs an LEDON signal corresponding to the remaining capacitance of the dry cells. The CPU of the battery pack turns on some of the LEDs, the number of which corresponds to the received LEDON signal for three seconds, to indicate to the user the remaining capacitance of the dry cells. This reports the user the remaining capacitance as well as an indication of the completion of mounting.

Abstract: A recording apparatus for recording an image on a recording medium by scanning a recording head, includes a scan unit for scanning the recording head by changing the scan speed of the recording head, and a control unit for controlling the scan unit to change the scan speed of the recording head according to the resolution of image data to be recorded by the recording head so as to perform recording. A recording controller for controlling the recording apparatus is also disclosed.

Abstract: A portable electronic apparatus utilizes battery characteristics to detect the operating condition of the battery supplying power to the apparatus. Battery voltage is detected in different operating states of the apparatus and the residual battery voltage is determined on the basis of the detected different state battery voltage.

Abstract: A secondary battery is charged to a full charge state without overcharging. A current detection circuit detects a charging current state supplied to the battery to control the turn-on and the turn-off of a switch in accordance with an output of the current detection circuit to control the application of the charging current to the battery.