Method for making key top made of translucent material., key top marked by that method, key unit, and process for producing key unit

A process for producing a key unit, comprising:

• incorporating an unmarked key top made of a light-transmitting material into the key unit;
• interrupting or stopping the production once in the state where steps are finished except for application of marking onto the key unit;
• and
• after defining of characters, symbols and the like which are necessary for the key unit, applying marking of these characters, symbols and the like onto the key top to complete the key unit.

A process for producing a key unit comprising a key pad made of a rubber or an elastomer and a key top attached the key pad, wherein the key top is made of a composition which develops color by irradiation of a laser beam, and wherein the key top is marked on the top face with necessary characters, symbols and the like by laser beam irradiation;

• wherein the process comprises:
• interrupting or stopping once the process for producing the key unit in the state where steps including assembling which are implementable without determination of a destination are finished;
• and
• after defining of characters, symbols and the like related to the destination, applying marking of these characters, symbols and the like related to the destination to the key top by irradiating a laser beam against the top face of the key top to complete the key unit.

A process for producing an illuminated key unit having a key pad made of a light-transmitting rubber or elastomer and a light-transmitting key top, wherein the key top is covered on the surface with a multilayer film which can be printed on by irradiation of a laser beam, and wherein necessary characters, symbols and the like are marked on the top face of the key top by laser beam irradiation,

• wherein the process comprises:
• interrupting or stopping once the process for producing the key unit in the state where all of the steps including assembling which are implementable without determination of a destination are finished;
• and
• after defining of characters, symbols and the like related to the destination, applying marking of these characters, symbols and the like related to the destination to the key top by irradiation of a laser beam onto the top face of the key top to complete the key unit.

A process for producing an illuminated key unit having a key pad made of a light-transmitting rubber or elastomer and a light-transmitting glass key top, wherein the glass key top is marked with necessary characters, symbols and the like by means of blasting to blast at a high speed fine abrasive particles against the top face of the key top,

• wherein the process comprises:
• interrupting or stopping once the process for producing the key unit in the state where steps including assembling which are implementable without determination of a destination are finished;
• and
• after defining of those elements of characters, symbols and the like which are related to the destination, applying marking of these characters, symbols and the like to the key top by means of maskless blasting to blast at a high speed fine abrasive particles directly against the top face of the glass key top to complete the key unit.

A process for producing an illuminated key unit having a key pad made of a light-transmitting rubber or elastomer and a light-transmitting hard resin key top, wherein the hard resin key top is marked on the top face with necessary characters, symbols and the like by means of blasting to blast at a high speed fine abrasive particles against the top face of the key top,

• wherein the process comprises:
• interrupting or stopping once the process for producing the key unit in the state where steps including assembling which are implementable without determination of a destination are finished;
• and
• after defining of those elements of characters, symbols and the like which are related to the destination, applying marking of these characters, symbols and the like to the top face of the key top by means of maskless blasting to blast at a high speed fine abrasive particles directly against the top face of the hard resin key top to complete the key unit.