CN87215026U

CN87215026U - Photoelectric key board

Info

Publication number: CN87215026U
Application number: CN 87215026
Authority: CN
Inventors: 杨晓宇; 陈大智
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-11-01
Filing date: 1987-11-01
Publication date: 1988-11-16

Abstract

The photoelectric key board provides a new device which controls the output of the keyboard signal by the on-off of the light beam and can be used as a keyboard of a computer and an electronic organ. The utility model controls the output of the keyboard signal by the on-off of the light beam, and therefore, the no-contact oxidation, the ageing, the shaking and the swinging can not exist. The utility model has the advantages of long service life, high reliability, simple structure and low cost. The keystroke is mainly composed of a key cap and foam (or a spring), the structure is especially simple; in addition, each row of keystrokes shares a light emitting diode and a photoelectric conversion circuit, and each column of keystroke also shares a light emitting diode and a photoelectric conversion circuit, and thus the circuit is simplified and the cost is reduced.

Description

Photoelectric key board

The present invention relates to a kind of improved keyboard, the keyboard that particularly a kind of suitable computer, electronic organ are used.

The button of existing keyboard comes down to a switch.By switch contactless two classes that are divided into are arranged: a class is contactless contactless keyboard, as using the keyboard of magnetosensitive integrated circuit; Another kind of is tactile keyboard, as using the keyboard of tongue tube, reed, conductive rubber.The advantage that contactless keyboard has contactless aging, oxidation, non-jitter, rocks.But button is sat back and waited by magnetosensitive integrated circuit, magnet steel, spring, keycap, the end and is formed.Complex structure cost height needs with more hardware and inconvenient maintenance; Though the tactile keyboard structure is simpler than contactless keyboard, exist that switch contact is shaken, rocks, worn out, oxidation, life-span weak point, poor reliability, for to go to shake the signal delay that also needs certain hour, influence operating rate.

The objective of the invention is to provide a kind of contactless, reliability is high, the life-span is long, simple in structure, easy to maintenance, keyboard that cost is low.

The present invention is achieved in that the light beam that the light-emitting diode that is positioned at keyboard one end sends, and by the space under the key panel, shines and carries out opto-electronic conversion on the light-sensitive element that is positioned at the keyboard other end.When the button on the keyboard face was pressed, the descending light beam that covered of button made the light-sensitive element that is positioned at the keyboard other end can not receive light signal, thus with photoelectric switching circuit that light-sensitive element links to each other in export the signal of telecommunication.Since on the key panel each button all corresponding corresponding row light beam and corresponding row light beam, when so each button is pressed, in the row and column photoelectric switching circuit of correspondence, will export a capable signal and a column signal respectively, promptly keyboard will be exported corresponding row sign indicating number and row sign indicating number.

The present invention only is made up of keycap and foam (or spring) because of button, so structure is simple especially; Simultaneously because each row light-emitting diode of key-press sharing and a photoelectric switching circuit, the also only shared light-emitting diode of each row button and a photoelectric switching circuit, this has just reduced light-emitting diode and photoelectric switching circuit quantity that keyboard uses; And, and the code non-jitter, rock, so keyboard circuit is simple especially because photoelectric switching circuit itself just can export corresponding row sign indicating number and be listed as yard; Come the output of supervisory keyboard signal in addition with the break-make of light beam, so do not have wearing and tearing, contactless aging, oxidation, the life-span is long, reliability is high.

Below with reference to accompanying drawing invention is described in further detail.

Fig. 1 is a profile of the present invention.

Fig. 2 is a vertical view of the present invention.

Fig. 3 is the basic circuit diagram of a photoelectric conversion unit of the present invention.

With reference to Fig. 1, keycap (1) places on the key panel (3) by foam (or spring) (2), leave a space between panel (3) and the base plate (4), the light beam irradiates that its size can allow light-emitting diode (6) to send arrives on the photosensitive tube (5), is handled by the photoelectric switching circuit that links to each other with photosensitive tube as shown in Figure 3 again.Be positioned at second row among Fig. 2, tertial button is example, when button is not pressed, be positioned at second light beam that sends of row light-emitting diode of keyboard one end, can shine by the space under the panel (3) on second photosensitive tube of going of the keyboard other end, this photosensitive tube resistance is reduced, so the photoelectric switching circuit of second row does not have useful signal output; The light beam that while the 3rd row light-emitting diode sends also shines on the tertial photosensitive tube, makes the 3rd row photoelectric switching circuit not have useful signal output.When being positioned at second row, when tertial button is pressed, keycap (1) is descending, covered the light beam that second row and the 3rd row light-emitting diode send, second row and the 3rd row photosensitive tube resistance are increased, so with the second capable photoelectric switching circuit that links to each other with the 3rd row photosensitive tube, all will export an electronegative potential (useful signal) respectively, and other each row of keyboard, the photosensitive tube of each row is because of being subjected to illumination, feasible each row that is attached thereto, it is constant that the photoelectric switching circuit of each row continues to keep high potential (invalid signals), and promptly keyboard has been exported and has been positioned at second row, the row sign indicating number of the 3rd row button and row sign indicating number.

Claims

One is placed on the key panel [3] by foam (or spring) [2] by keycap [1], leave the space between panel [3] and the base plate [4], the light beam irradiates that its size can allow light-emitting diode [6] to send arrives on the photosensitive tube [5], the keyboard of handling by the photoelectric switching circuit that links to each other with photosensitive tube again, the feature of this keyboard is the output that comes the supervisory keyboard signal with the break-make of light beam, the material that resets after being pressed as keycap [1] with foam [2].