JPS5038454B1 - |
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| 申请号 | JP3690070 | 申请日 | 1970-05-01 | 公开(公告)号 | JPS5038454B1 | 公开(公告)日 | 1975-12-10 |
| 申请人 | 发明人 | ||||||
| 摘要 | 1,255,900. Retractive switches. INTERNATIONAL BUSINESS MACHINES CORP. 29 April, 1970 [2 May, 1969], No. 20484/70. Heading H1N. A hand-held keyboard data device 10 is in combination with an actuator 52. The keyboard utilizes a diaphragm switch matrix similar to that described in Specification 1,134,507. The actuator 52 includes a switch 60 which must be actuated in addition to the actuation of a selected data entry switch to effect transmission of data to an associated data receiving unit. To indicate to an operator that data has been entered, the actuator switch 60 generates an audible sound and in addition, a light is illuminated on the keyboard. The actuator 52 comprises a projecting element 55 which is retracted initially against the bias of a spring in switch 60 and then against the bias of a stronger spring 65 which provides lostmotion overtravel. The nose of the housing 53 cannot enter the lesser diameter portion of the frusto-conical openings in panel 16 and thus the force applied to the diaphragm switch is limited to a value determined by spring 65. A printed-circuit board (23, Fig. 2, not shown) constituting the fixed contacts of the diaphragm switch matrix within device 10 is connected to cable 28 by a plug and socket (25, 27). | ||||||
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