Change-over shutter for light-wave range finder
First Claim
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1. A change-over shutter for a light-wave range finder for changing over between measurement light and compensation light, comprising;
- a shutter body having a plurality of measurement light slits and at least one compensation slit, and a light-quantity reducing member provided in at least one of said measurement light slits.
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Abstract
A change-over shutter for an optical range finder employs at least two slits for measurement light, one of which is employed during long distance measurements and the other of which includes a light reduction member and is employed for short distance measurements. The arrangement advantageously eliminates measurement error caused in short distance measurements due to light secondarily reflected from the light emitting element.
24 Citations
12 Claims
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1. A change-over shutter for a light-wave range finder for changing over between measurement light and compensation light, comprising;
- a shutter body having a plurality of measurement light slits and at least one compensation slit, and a light-quantity reducing member provided in at least one of said measurement light slits.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A change-over shutter for light-wave range finder comprising a shutter body having at least one measurement light slit and at least one compensation light slit, and means for reducing amounts of secondarily reflected stray light passing through said measurement slit, thereby eliminating measurement error.
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11. A change-over shutter for a light-wave range finder comprising a shutter having at least one measurement light slit and at least one compensation light slit, and means for reducing amounts of secondarily reflected stray light passing through said measurement slit, thereby eliminating measurement error in short distance measurements otherwise caused by secondarily reflected stray light.
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12. A change-over shutter for a light-wave range finder comprising a shutter body having first means for making long distance measurements and second means for making short distance measurements, said first means having at least one first measurement light slit, and said second means having at least one second measurement light slit different from said at least one first measurement light slit.
Specification