Keyboard with four character set shift专利检索-假名电脑零配件专利检索查询-专利查询网

Keyboard with four character set shift

阅读：474发布：2021-12-29

专利汇可以提供Keyboard with four character set shift专利检索，专利查询，专利分析的服务。并且A circuit is provided for operating a keyboard in a selected one of four character sets: upper and lower case Latin and upper and lower case Katakana. The circuit responds to signals produced by the familiar Shift and Lock keys of a conventional keyboard. One of the shift keys is designated a Latin shift key and the other is designated a Katakana shift key. Depressing a shift key momentarily sets the keyboard to operate in the lower case of the character set identified by the shift key. For upper case, the operator either sets the shift Lock or holds the appropriate shift key while striking a character key. A specific logic circuit is disclosed.，下面是Keyboard with four character set shift专利的具体信息内容。

权利要求

1. In a keyboard having character keys and first and second shift keys, apparatus for responding to said two shift keys to select one of four character sets, comprising; a latch and means connecting said first shift key to control setting said latch and connecting said second shift key to Control resetting said latch, said first key being identified with a first character set having upper and lower case character subsets and said second shift key being identified with a second character set having upper and lower case character subsets, whereby the state of said latch identifies one of said first and second character sets, means responsive to the closing of one of said character keys and to the state of said latch and to the absence of the closing of either of said shift keys to select a character in the lower case of the character set identified by the latch, and means responsive to the concurrent closing of one of said shift keys and one of said character keys for selecting a character in the upper case of the character set identified by the state of said latch.

2. The apparatus of claim 1 wherein said means connecting said shift keys to control said latch includes means connecting said latch to be set in response to the closing of said first shift key and to be reset in response to the closing of said second shift key.

3. The apparatus of claim 2 wherein said means for selecting a character in the upper case includes means responsive to the closing of said first shift key to select the upper case of said first character set and means responsive to the closing of said second shift key to select the upper case of said second character set.

4. The apparatus of claim 3 wherein said keyboard includes a shift lock key and said means to select the upper case includes means responsive to the closed state of said lock key for selecting the upper case.

5. The apparatus of claim 4 including means responsive to the state of said latch, said shift keys and said lock key for producing four signals separately identifying said upper case of said first set, said lower case of said first set, said upper case of said second set, and said lower case of said second set.

6. The apparatus of claim 5 including means responsive to the closed state of said shift lock key for inhibiting a signal identifying either of said lower case subsets.

7. The apparatus of claim 6 including means to produce a predetermined one of said signals and to inhibit the other three of said signals independently of the state of said latch.

8. The apparatus of claim 7 including means responsive to the closing of one of said shift keys to select one character to be keyed in a selected character subset when said predetermined signal is produced.

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Keyboard with four character set shift

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