JPS622675Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a keyboard device for inputting data into an information processing device or the like.

Keyboard devices that input data into information processing devices generally use mechanical contacts or other physical actions, but due to the high frequency of operation, switch circuit failures are common. There are drawbacks such as wear and tear and shortened lifespan. or,
There are also inconveniences such as a large number of electric wires being required for connection to an information processing device, etc., and the connection cable becoming thick.

An object of the present invention is to eliminate the drawbacks of the conventional keyboard devices described above, and to provide a keyboard device that has a simple structure, is free from failure, and can be connected to an information processing device or the like using only three electric wires.

This invention arranges a number of light-emitting elements equal to the rows and columns of the keyboard opening/closing function on two sides that intersect at right angles that make up the outer frame of the keyboard, and sequentially blinks these light-emitting elements at high speed with pulse output to emit light. By placing the light-receiving surfaces of optical fibers on two sides perpendicular to the outer frame of the keyboard, which correspond to the opposing surfaces of the elements, and detecting the light guided by the bundle of optical fibers with one optical-to-electrical conversion element, the keyboard When light is blocked by an operator's finger, etc. at the intersection of any row and column above, the AND condition of the pulse signal that drives the light emitting element that emits light passing through the intersection and the output of the optical/electric conversion element is Taking advantage of this fact, the intersection of the occluded row and column on the keyboard is detected, and the function processing displayed at the intersection on the keyboard can be executed. That is, the spatial position of a key on a keyboard is specified using a time series pulse that causes a light emitting element to blink at high speed and a pulse output from a light receiving element.

The figure shows a configuration example of a keyboard device according to the present invention, in which 1 is a clock pulse input terminal, 2 is a light emitting element drive circuit, 3 is a light emitting element, 4 is a keyboard, 5 is a row light beam, 6 is a column light beam, and 7 is an optical 8 is a light-to-electrical conversion element, and 9 is a received light pulse output terminal.

The clock pulse that enters 1 starts a counter externally and at the same time causes the light emitting element 3 to blink sequentially at high speed via the drive circuit 2. Which light-emitting element is being driven is synchronized with the value of an external counter, and if the keyboard is not operated, that is, if the light from the light-emitting element is not blocked and reaches the optical fiber 7, the light-to-electrical conversion is activated. The outputs of the elements are also synchronized.

That is, the external counter, the light output of the light emitting element, and the output of the optical/electric conversion element are synchronized.

When the keyboard is operated, that is, when the light that crosses the intersection of any row and column of the keyboard is blocked, the output of the optical-to-electrical conversion element among the three above stops, and the external counter and the optical-to-electrical conversion element stop outputting. The AND condition of the output of the element is no longer satisfied. this
The AND condition becomes unsatisfied twice in rows and columns for one period of scanning of all light emitting elements. The row and column of the keyboard are identified by the counter value at this time,
Find the intersection of rows and columns.

According to this device, it is possible to realize a keyboard that has a simple structure, is strong against vibrations and shocks, has few failures, is lightweight, and has few interface cables, and has a structure that allows easy maintenance and replacement of light emitting elements and light receiving elements.

[Brief explanation of the drawing]

The figure is a configuration diagram of a keyboard device according to the present invention. 1...Input terminal, 2...Light emitting element drive circuit, 3
...Light emitting element, 4...Keyboard, 7...Optical fiber.

Claims (1)

[Scope of utility model registration request] A number of emitting elements equal to the number of rows and columns of the matrix are arranged on two sides that intersect at right angles to a board surface partitioned into a matrix to prevent light from interfering between adjacent rows and columns. is driven by time-series pulses and detects when the light passing through the rows and columns of the matrix is blocked by a finger or the like with a single light-receiving element via optical fibers placed on the other two sides of the matrix. A keyboard device characterized in that it specifies the intersection of a row and a column.