| 摘要 |
PROBLEM TO BE SOLVED: To provide a folding type portable telephone which can be quickly opened when a call is necessary and has little fear of falling due to reaction of the quick opening. SOLUTION: A hinge part 13 for connecting a first case 11 and a second case 12 has such a structure that is provided with a hinge unit 15 having an one-touch opening function and also a damper unit 14 having a rotary damper function. The hinge unit 15 has such one-touch opening function that the second case 12 is immediately opened because of turning energy stored in a twisted coil spring arranged in the hinge part 13, when a lock-releasing button 16 is pushed. In this case, when the second case 12 is opened up to a predetermined angleβ, vanes arranged on a shaft of the damper unit 14 begin to turn. When the vanes turn, the turning speed of the shaft is suppressed by viscous resistance of the oil sealed in the case of the damper unit 14. As a result, the opening speed of the second case 12 is suppressed when the second case 12 is opened more than the predetermined angleβ.
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