公开(公告)号：US06373686B1

公开(公告)日：2002-04-16

申请号：US09639994

申请日：2000-08-16

申请人： Tadahiko Ogawa ,  Hajime Takakuwa ,  Hiroyuki Yamamoto ,  Kiyotaka Tomioka

发明人： Tadahiko Ogawa ,  Hajime Takakuwa ,  Hiroyuki Yamamoto ,  Kiyotaka Tomioka

IPC分类号： H02B104

CPC分类号： H01H9/287 ,  H01H11/0006 ,  H01H27/00

摘要： An object is to provide a key protection structure for an electronic apparatus which can prevent a preset value of a switch from being intentionally changed by the user or the like. When setting of a first switch 21 is ended, a tool shutter operation portion 72 of a lock key 70 is inserted into a first shutter operation hole 61. The tool shutter operation portion 72 is then engaged with an engaging recess 45 of a first shutter 40. Thereafter, the lock key 70 is rotated, so that the first shutter 40 is rotated. A covering portion 44 of the shutter is therefore moved immediately above the first switch 21 to close a first switch operation hole 58, whereby the first switch 21 can be locked (key-protected) so as not to be externally operated.

摘要翻译： 本发明的目的是提供一种用于电子设备的键保护结构，其可防止开关的预设值被用户有意地改变。当第一开关21的设置结束时，工具快门操作部分72 锁定键70被插入到第一快门操作孔61中。然后，工具快门操作部分72与第一遮板40的接合凹部45接合。此后，锁定键70旋转，使得第一遮板40为 旋转 因此，快门的覆盖部分44在第一开关21的正上方移动以关闭第一开关操作孔58，由此第一开关21可被锁定（密钥保护），以便不被外部操作。

公开(公告)号：US5218579A

公开(公告)日：1993-06-08

申请号：US428308

申请日：1989-10-30

申请人： Kiyotaka Tomioka ,  Hiroyuki Yamamoto ,  Hideaki Tanaka

发明人： Kiyotaka Tomioka ,  Hiroyuki Yamamoto ,  Hideaki Tanaka

IPC分类号： H03K21/00 ,  G04G15/00 ,  H03K21/40

CPC分类号： G04G15/00

摘要： A numerical value setting device which accomplishes a numberical value setting or registering operation whether a power supply is interrupted or restored during its operation has a set value registering timer. The set value registering timer defines a period at the end of which the set value is registered. The set value registering timer counts different period clock pulses depending on the states of the power supply to assure that the correct numerical value is registered.