少なくとも一方

1. 電源回路と発光回路との間、および、発光回路と制御回路との間の少なくとも一方に設けられた絶縁体。

2. ChatGPT:

   An insulator provided in at least one of the locations between the power supply circuit and the light-emitting circuit, and between the light-emitting circuit and the control circuit.

3. あなた:

   How about "An insulator provided between the power supply circuit and the light-emitting circuit, and/or between the light-emitting circuit and the control circuit"?

4. ChatGPT:

   Your version, "An insulator provided between the power supply circuit and the light-emitting circuit, and/or between the light-emitting circuit and the control circuit," is clear and concise, and it accurately conveys the idea of "at least one of" in this context. Using "and/or" here is a natural and efficient way to express the inclusivity of both possibilities.

   This phrasing is more streamlined than the original translation and is perfectly suitable, especially in technical or patent-related contexts where clarity and brevity are important.