GB1241501A - Improvements in or relating to a telemeter including a projector forming a luminous spot on the object the range of which is to be ascertained - Google Patents
Improvements in or relating to a telemeter including a projector forming a luminous spot on the object the range of which is to be ascertainedInfo
- Publication number
- GB1241501A GB1241501A GB45038/69A GB4503869A GB1241501A GB 1241501 A GB1241501 A GB 1241501A GB 45038/69 A GB45038/69 A GB 45038/69A GB 4503869 A GB4503869 A GB 4503869A GB 1241501 A GB1241501 A GB 1241501A
- Authority
- GB
- United Kingdom
- Prior art keywords
- modulation
- frequency
- range
- metres
- photo
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/32—Systems determining position data of a target for measuring distance only using transmission of continuous waves, whether amplitude-, frequency-, or phase-modulated, or unmodulated
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
- G01C3/32—Measuring distances in line of sight; Optical rangefinders by focusing the object, e.g. on a ground glass screen
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
- G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
- G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Optics & Photonics (AREA)
- Focusing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
- Measurement Of Optical Distance (AREA)
Abstract
1,241,501. Photo-electric distance measuring. PAILLARD S.A. 12 Sept., 1969 [24 Sept., 1968], No. 45038/69. Heading H4D. In a range finder generally of the kind described in Specification 1,180,778 the frequency of modulation of the projected light beam from lamp 1 is arranged to increase as range decreases. The object of the invention is to afford a rapid response for small ranges so as to correctly focus a cine camera whilst avoiding hunting when the range is large. In the embodiment photo-conductors 9, 10 (see also Fig. 1, not shown) give rise to an A.C. signal of amplitude corresponding to the departure of the photoconductor assembly from a balance position and of phase, relative to the modulation of the transmitted beam, dependent on the sense of such departure. In one embodiment the modulation is at 20 c/s. for ranges between 5 and 20 metres and at 80 c/s. for ranges below 5 metres (20 metres corresponds in practice to focusing at infinity). The change-over of frequency is effected by a switch (25, Fig. 1, not shown) actuated by a projection on the support of the photo-conductor assembly. In another embodiment the modulation of transmitting lamp 1 is effected by a multivibrator MX the frequency of which depends on the voltage at the collector of transistor T3. When the added outputs from cells 9, 10 is large (corresponding to a nearby target) transistor T2 is rendered more conductive, the voltage drop across resistor R9 is small and the multivibrator gives maximum frequency; and vice-versa. Lamp 1 is an incandescent one which is advantageous in that the modulation depth of the light beam is larger for low modulation frequencies.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1433168A CH481394A (en) | 1968-09-24 | 1968-09-24 | Rangefinder comprising a projector whose light beam is intended to form a "spot" on the object whose distance is to be determined |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1241501A true GB1241501A (en) | 1971-08-04 |
Family
ID=4399889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB45038/69A Expired GB1241501A (en) | 1968-09-24 | 1969-09-12 | Improvements in or relating to a telemeter including a projector forming a luminous spot on the object the range of which is to be ascertained |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT284619B (en) |
| CH (1) | CH481394A (en) |
| DE (1) | DE1947674A1 (en) |
| FR (1) | FR2018724B1 (en) |
| GB (1) | GB1241501A (en) |
-
1968
- 1968-09-24 CH CH1433168A patent/CH481394A/en not_active IP Right Cessation
- 1968-10-07 AT AT978868A patent/AT284619B/en not_active IP Right Cessation
-
1969
- 1969-09-12 GB GB45038/69A patent/GB1241501A/en not_active Expired
- 1969-09-12 FR FR696931237A patent/FR2018724B1/fr not_active Expired
- 1969-09-16 DE DE19691947674 patent/DE1947674A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CH481394A (en) | 1969-11-15 |
| DE1947674A1 (en) | 1970-04-02 |
| FR2018724A1 (en) | 1970-06-26 |
| FR2018724B1 (en) | 1973-03-16 |
| AT284619B (en) | 1970-09-25 |
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