Seiko Group has been granted a patent for a head chip, liquid jet head, and liquid jet recording device that ensure sufficient ejection pressure. The head chip includes an actuator plate with first and second ejection channels, and a feedback plate. The first ejection channels are surrounded by upstream drive walls, while the second ejection channels are surrounded by downstream drive walls. The head chip allows for independent communication between the first and second jet channels. GlobalData’s report on Seiko Group gives a 360-degree view of the company including its patenting strategy. Buy the report here.

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According to GlobalData’s company profile on Seiko Group, Treatment progress monitoring was a key innovation area identified from patents. Seiko Group's grant share as of September 2023 was 29%. Grant share is based on the ratio of number of grants to total number of patents.

A head chip with multiple drive cells and jet channels

Source: United States Patent and Trademark Office (USPTO). Credit: Seiko Group Corp

A recently granted patent (Publication Number: US11760105B2) describes a head chip for a liquid jet head. The head chip includes an actuator plate with multiple drive cells arranged in a first direction. Each drive cell has a first jet channel and a second jet channel that open on one side in a second direction perpendicular to the first direction. The head chip also includes an end member with a coupling channel for each drive cell. The coupling channels do not communicate with each other and are configured to connect the first and second jet channels within the same coupling channel. The first jet channel is surrounded by a pair of first drive walls that can expand or contract the channel, and the second jet channel is surrounded by a pair of second drive walls that can also expand or contract the channel.

In addition, the head chip has non-jet channels located on opposite sides of the second jet channel with respect to the first jet channel. The non-jet channels extend in the second direction. The head chip also includes a closure part on the end member to cover the non-jet channels. The actuator plate has a thickness direction, and the first and second jet channels open on different principal surfaces in the thickness direction. A first cover plate with a liquid flow channel connected to the first jet channel is placed on one side of the actuator plate, and a second cover plate with a liquid flow channel connected to the second jet channel is placed on the other side of the actuator plate.

The granted patent also mentions a liquid jet head and a liquid jet recording device that incorporate the described head chip. The liquid jet head includes the head chip with the actuator plate, drive cells, jet channels, and cover plates. The liquid jet recording device includes the liquid jet head for printing or recording purposes.

Overall, this granted patent introduces a head chip design for a liquid jet head that allows for precise control of liquid flow through multiple drive cells. The design includes separate coupling channels for each drive cell and non-jet channels for improved functionality. The patent also mentions the application of the head chip in a liquid jet head and a liquid jet recording device.

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GlobalData, the leading provider of industry intelligence, provided the underlying data, research, and analysis used to produce this article.

GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.