Title:
REFLECTIVE OPTICAL SCALE FOR ENCODER, REFLECTIVE OPTICAL ENCODER, AND LAMINATE FOR REFLECTIVE OPTICAL SCALE FOR ENCODER
Document Type and Number:
WIPO Patent Application WO/2024/063131
Kind Code:
A1
Abstract:
This disclosure provides a reflective optical scale for an encoder, the reflective optical scale including, in the thickness direction and in the stated order: a high-reflection layer; a protective layer; and a low-reflection layer that is provided in a pattern. The reflective optical scale also includes: a low-reflection region being a region in which the low-reflection layer is provided; and a high-reflection region being a region in which the protective layer is exposed. The following formula (1) is satisfied if the film thickness of the protective layer is defined as d (µm), and the incident angle of incident light hitting the protective layer is defined as θ (°). d = mλ / [2n × cos {Arcsin (sinθ/n)}] (1) (in this formula, n is the refractive index of the protective layer, λ is the wavelength (µm) of the incident light, and m is a number satisfying the relationship 0 < m ≤ 0.3, or p – 0.3 ≤ m ≤ p + 0.3 (p being an integer between 1 and 3, inclusive).)
Inventors:
IMAI TSUYOSHI (JP)
Application Number:
PCT/JP2023/034256
Publication Date:
March 28, 2024
Filing Date:
September 21, 2023
Export Citation:
Assignee:
DAINIPPON PRINTING CO LTD (JP)
International Classes:
G01D5/347
Domestic Patent References:
| WO2021201024A1 | 2021-10-07 |
Foreign References:
| JP2017134073A | 2017-08-03 | |||
| JP2005241248A | 2005-09-08 |
Attorney, Agent or Firm:
YAMASHITA, Akihiko et al. (JP)
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