PUSHBUTTON VARIABLE CAPACITOR

• US 3,659,163 A
• Filed: 07/29/1969
• Issued: 04/25/1972
• Est. Priority Date: 07/29/1969
• Status: Expired due to Term

• Current Assignee: Iosif Leibovich Markman, Konstantin Grigorievich Borisov, Leonid Semenovich Sitnikov, Lev Lazarevich Utyakov
• Original Assignee: Iosif Leibovich Markman, Konstantin Grigorievich Borisov, Leonid Semenovich Sitnikov, Lev Lazarevich Utyakov
• Inventors: Sitnikov, Leonid Semenovich, Utyakov, Lev Lazarevich, Markman, Iosif Leibovich, Borisov, Konstantin Grigorievich
• Primary Examiner(s): Goldberg, E. A.
• Application Number:
  US04/845,770
• Time in Patent Office: 1,001 Days
• Field of Search: 317/246,249 200/166H,181 340/365 323/93
• US Class Current: 361/288
• CPC Class Codes: G06F 3/0202 Constructional details or processes of manufacture of the input device
• CPC Class Codes: H01H 2239/006 Containing a capacitive switch or usable as such
• CPC Class Codes: H03K 17/975 using a capacitive movable element

Abstract

A pushbutton key unit of a data input device for, say, a computer, comprising a push rod with a pull-back spring and a mechanical motion-to-electric signal converter associated with said push rod and having the form of a variable capacitor. The pushbutton key is simple in manufacture and reliable in operation.

Claims

1. A pushbutton key unit of a data input device for, say, a computer, comprising a frame, a push rod mounted in said frame and capable of moving axially relative to said frame, a pull-back spring for said push rod, a mechanical motion-to-electric signal converter associated with said push rod and comprising a capacitor, at least one isolated substantially rigid plate of said capacitor being mounted on and movable with said push rod and at least two other substantially rigid plates of said capacitor being fixed on said frame through insulating packings and connected to information output means for the data input device.

2. A pushbutton key unit as claimed in claim 1, in which said packing isolating said capacitor plate from said push rod comprises a shock-absorbing material.

3. A pushbutton key unit as claimed in claim 1, in which said fixed plates lie in a single common plane which is perpendicular to the shift line of said push rod.

4. A pushbutton key unit as claimed in claim 1, in which said fixed plates are divided into two groups which are placed in two planes perpendicular to the shift line of said push rod and lie on the opposite sides of said isolated plate attached to said push rod.