摘要:
A state detection circuit comprises: a first counter circuit that counts a series of first command signals indicative of start of an operation control; a second counter circuit that counts a series of second command signals indicative of completion of the operation control; a count coincidence detection circuit that detects coincidence between a count in the first counter circuit and a count in the second counter circuit; and a state storing circuit that is set by the series of first command signals and reset when coincidence is detected by the count coincidence detection circuit. The first and second counter circuits each comprise a binary counter.
摘要:
To provide an optical pickup device adapted such that for adhesion fixing of a holder for holding an LD or a light-receiving element to an optical pickup casing via an ultraviolet-curable adhesive, curing shrinkage during ultraviolet irradiation can be reduced and adhesion fixing achieved with high positioning accuracy. In a structure for adhesion fixing of a holder for holding an LD or a light-receiving element to an optical pickup casing via an ultraviolet-curable adhesive, since protrusions are provided at peripheral sections (UV irradiation light source side) on a bonding surface of the holder, a section exposed to strong UV light is first cured, then after the adhesive has moved from an uncured section, the amount of shrinkage of the first cured section in a Z-direction is reduced, and the uncured section is cured.
摘要:
When an update disable signal is at an inactivation level, a latch signal is activated in accordance with an active signal and a mode register set signal. When the update disable signal is at an activation level, the latch signal is activated in accordance with the active signal while being not activated in accordance with the mode register set signal. Based on the latch signal, the address signal is latched. Based on the latched address signal, an internal test signal is generated. With this structure, a target chip can be selectively controlled simply by activating the update disable signal in the target chip.