Patent US4781457A successfully refreshed from Google Patents.
US4781457A
Expired / Lapsed
US
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Laser surveying equipment
Assignee: Topcon Corp
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Filing: 1985-03-25
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Granted: 1988-11-01
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Expires: 2005-03-25
Abstract
Abstract A laser surveying equipment includes a laser beam luminous section, a suspending reflection member suspended in such a manner as to reflect laser beam radiated from the laser beam luminous section upward and always to direct the optical axis of such reflected light in the perpendicular direction, and a projection lens system adapted to project the laser beam after forming it into a generally parallel flux of light. A rotary reflection member can be rotatably arranged in order to displace by approximately 90 degree an optical path of parallel flux of light obtained from the projection lens system and to scan the parallel flux of light toward a surveying object within a horizontal plane.
Inventors
- 👤 Satoshi Hirano
- 👤 Takuji Sato
- 👤 Hiroshi Nishikatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:37
CPC Classifications
G; G01; G01C; G01C15/00; G01C15/002; G01C15/004
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
121 words
A laser surveying equipment comprising: a laser beam luminous emitting section which is fixed relative to said laser surveying equipment; a reflection member for producing an erected normal image, including means located above said laser beam luminous emitting section for upwardly reflecting the laser beam emitted from the laser beam luminous emitting section; and a projection lens system which is substantially fixed relative to said laser beam luminous emitting section, and which receives the laser beam reflected from said reflection member and converts the thusly received laser beam to a parallel laser beam; suspension means for suspending said reflection member relative to said laser beam luminous emitting section; wherein said parallel laser beam from said projection lens is always directed vertically.
Claim 2
Dependent Claim
121 words
A laser surveying equipment comprising: a laser beam luminous emitting section which is fixed relative to said laser surveying equipment; a reflection member for producing an erected normal image, including means located above said laser beam luminous emitting section for upwardly reflecting the laser beam emitted from the laser beam luminous emitting section; and a projection lens system which is substantially fixed relative to said laser beam luminous emitting section, and which receives the laser beam reflected from said reflection member and converts the thusly received laser beam to a parallel laser beam; suspension means for suspending said reflection member relative to said laser beam luminous emitting section; wherein said parallel laser beam from said projection lens is always directed vertically.
Claim 3
Dependent Claim
19 words
A laser surveying equipment according to claim 1, wherein said laser beam luminous emitting section includes a semiconductor laser.
Claim 4
Dependent Claim
17 words
A laser surveying equipment according to claim claim 1, wherein said reflection member comprises a Porro prism.
Claim 5
Dependent Claim
37 words
A laser surveying equipment according to claim 1, wherein said suspension means for suspending said reflection member comprises suspension wires each having a length of approximately one half of a focal distance of said projection lens system.
Claim 6
Dependent Claim
21 words
A laser surveying equipment according to claim 1, wherein said suspension means for suspending said reflection member comprises four suspension wires.
Claim 7
Dependent Claim
42 words
A laser surveying equipment according to claim 1, wherein said projection lens system has an optical axis which remains colinear with the laser beam from the laser beam luminous emitting section between the laser beam luminous emitting section and the reflection member.
Claim 8
Dependent Claim
175 words
A laser surveying equipment comprising: a laser beam luminous emitting section which is fixed relative to said laser beam surveying equipment; a reflection member for producing an erected normal image which is located above said laser beam luminous emitting section, and which upwardly reflects the laser beam emitted from the laser beam luminous emitting section; a projection lens system which is substantially fixed relative to said laser beam luminous emitting section, and which receives the laser beam reflected from said reflection member and converts the thusly received laser beam to a parallel laser beam; and a rotary reflection member rotatably arranged in order to displace by approximately 90 degrees an optical path of said parallel laser beam projected from said projection lens system and to scan said parallel laser beam within a horizontal plane toward an object being surveyed; suspension means for suspending said reflection member relative to said laser beam luminous emitting section; wherein said parallel laser beam from said projection lens system is always directed vertically for entry into said rotary reflection member.
Claim 9
Dependent Claim
175 words
A laser surveying equipment comprising: a laser beam luminous emitting section which is fixed relative to said laser beam surveying equipment; a reflection member for producing an erected normal image which is located above said laser beam luminous emitting section, and which upwardly reflects the laser beam emitted from the laser beam luminous emitting section; a projection lens system which is substantially fixed relative to said laser beam luminous emitting section, and which receives the laser beam reflected from said reflection member and converts the thusly received laser beam to a parallel laser beam; and a rotary reflection member rotatably arranged in order to displace by approximately 90 degrees an optical path of said parallel laser beam projected from said projection lens system and to scan said parallel laser beam within a horizontal plane toward an object being surveyed; suspension means for suspending said reflection member relative to said laser beam luminous emitting section; wherein said parallel laser beam from said projection lens system is always directed vertically for entry into said rotary reflection member.
Claim 10
Dependent Claim
18 words
A large surveying equipment according to claim 7, wherein said laser beam luminous section comprises a semiconductor laser.
Claim 11
Dependent Claim
17 words
A laser surveying equipment according to claim claim 7, wherein said reflection member comprises a Porro prism.
Claim 12
Dependent Claim
32 words
A laser surveying equipment according to claim 7, wherein said reflection member is suspended by suspension wires having a length approximately one half of a focal distance of said projection lens system.
Claim 13
Dependent Claim
21 words
A laser surveying equipment according to claim 7, wherein said suspension means for suspending said reflection member comprises four suspension wires.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |