Patent ID: 11895402
Assignee: LARGAN DIGITAL CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 20:
21. The actuator according to claim 16, wherein each of the plurality of optical mark units further comprises a second optical mark surface, and the first optical mark surface and the second optical mark surface of each of the plurality of optical mark units are arranged side by side;
wherein an angle between an observation direction and the optical mark structure is θ, a gloss value difference in the observation direction between the first optical mark surface and the second optical mark surface of each of the plurality of optical mark units is ΔG, and the following conditions are satisfied:

50[deg.]≤θ≤90[deg.]; and

15[GU]≤ΔG≤50[GU].