Patent US5225918A successfully refreshed from Google Patents.
US5225918A
Expired / Lapsed
US
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Hologram scale, apparatus for making hologram scale, moving member having hologram scale assembled hologram scale and apparatus for making assembled hologram scale
Assignee: DMG Mori Co Ltd
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Filing: 1991-07-17
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Granted: 1993-07-06
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Expires: 2011-07-17
Abstract
Abstract An apparatus for making a hologram scale is comprised of a reference diffraction grating on which a light becomes incident and from or by which the incident light is emitted or reflected as a diffracted light, and a recording material, wherein at least two diffracted lights of the diffracted light are caused to interfere with each other as an object wave and a reference wave so as to form a hologram scale on the recording material. Further, an apparatus for making an assembled hologram scale, a hologram scale, an assembled hologram scale and a moving member having a hologram scale are also provided.
Inventors
- 👤 Kayoko Taniguchi
- 👤 Hideki Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:38
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/20; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/347; G01D5/34707; G03H1/26
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
130 words
An apparatus for making a hologram scale comprising: a reference diffraction grating on which light is incident and from or by which said incident light is emitted or reflected as diffracted light comprising a zero-order diffracted beam and at least one additional diffracted beam; a slit plate having a slit formed therein, boundaries of said slit being formed with knife edges, and said slit plate being arranged adjacent said reference diffraction grating to pass a portion of light beams diffracted by said reference diffraction grating; and a recording medium whereon at least two diffracted beams of said diffracted light including said zero-order diffracted beam are caused to interfere with each other as an object wave and a reference wave so as to form a hologram scale on said recording medium.
Claim 2
Independent Claim
130 words
An apparatus for making a hologram scale comprising: a reference diffraction grating on which light is incident and from or by which said incident light is emitted or reflected as diffracted light comprising a zero-order diffracted beam and at least one additional diffracted beam; a slit plate having a slit formed therein, boundaries of said slit being formed with knife edges, and said slit plate being arranged adjacent said reference diffraction grating to pass a portion of light beams diffracted by said reference diffraction grating; and a recording medium whereon at least two diffracted beams of said diffracted light including said zero-order diffracted beam are caused to interfere with each other as an object wave and a reference wave so as to form a hologram scale on said recording medium.
Claim 3
Dependent Claim
50 words
An apparatus for making a hologram scale according to claim 1 wherein an assembled hologram scale is formed on said recording medium by moving said recording medium relative to said reference diffraction grating by a length equal to an integral multiple of a grating pitch of said reference diffraction grating.
Claim 4
Dependent Claim
50 words
An apparatus for making a hologram scale according to claim 1 wherein an assembled hologram scale is formed on said recording medium by moving said reference diffraction grating relative to said recording medium by a length equal to an integral multiple of a grating pitch of said reference diffraction grating.
Claim 5
Dependent Claim
20 words
An apparatus for making a hologram scale according to claim 1 wherein said reference diffraction grating includes a hologram scale.
Claim 6
Dependent Claim
77 words
A moving member having a hologram scale comprising: a reference diffraction grating having a selected grating pitch; a recording medium; and a moving member for moving said recording medium relative to said reference diffraction grating by an integral multiple of said grating pitch; wherein light beams diffracted by a diffraction grating are caused to interfere with each other as an object wave and a reference wave so as to form a hologram scale on said recording medium.
Claim 7
Dependent Claim
77 words
A moving member having a hologram scale comprising: a reference diffraction grating having a selected grating pitch; a recording medium; and a moving member for moving said recording medium relative to said reference diffraction grating by an integral multiple of said grating pitch; wherein light beams diffracted by a diffraction grating are caused to interfere with each other as an object wave and a reference wave so as to form a hologram scale on said recording medium.
Claim 8
Independent Claim
182 words
An apparatus for making a hologram scale comprising: a reference diffraction grating in which a grating pitch thereof has fluctuations, so that said reference diffraction grating does not lie in a single plane, and by which incident light is emitted as diffracted light having a zero-order beam and a primary diffracted beam; spacer means arranged on said reference diffraction grating at locations corresponding to said fluctuations; a supporting device for holding said spacer means in contact with said fluctuations and for supporting said reference diffraction grating; a slit plate having a slit formed therein, boundaries of said slit being formed with knife edges, said slit plate being arranged adjacent said reference diffraction grating to pass a portion of light beams diffracted by said reference diffraction grating; and a recording medium whereon at least two diffracted beams of said diffracted light beams passed by said slit plate and including said zero-order beam and said primary diffracted beam are caused to interfere with each other as an object wave and a reference wave so as to form a hologram scale on said reference medium.
Claim 9
Independent Claim
182 words
An apparatus for making a hologram scale comprising: a reference diffraction grating in which a grating pitch thereof has fluctuations, so that said reference diffraction grating does not lie in a single plane, and by which incident light is emitted as diffracted light having a zero-order beam and a primary diffracted beam; spacer means arranged on said reference diffraction grating at locations corresponding to said fluctuations; a supporting device for holding said spacer means in contact with said fluctuations and for supporting said reference diffraction grating; a slit plate having a slit formed therein, boundaries of said slit being formed with knife edges, said slit plate being arranged adjacent said reference diffraction grating to pass a portion of light beams diffracted by said reference diffraction grating; and a recording medium whereon at least two diffracted beams of said diffracted light beams passed by said slit plate and including said zero-order beam and said primary diffracted beam are caused to interfere with each other as an object wave and a reference wave so as to form a hologram scale on said reference medium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |